blob: bed43081720f718fc30dca204be8509ddcf5eac5 [file] [log] [blame]
Alex Tomasa86c6182006-10-11 01:21:03 -07001/*
2 * Copyright (c) 2003-2006, Cluster File Systems, Inc, info@clusterfs.com
3 * Written by Alex Tomas <alex@clusterfs.com>
4 *
5 * Architecture independence:
6 * Copyright (c) 2005, Bull S.A.
7 * Written by Pierre Peiffer <pierre.peiffer@bull.net>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public Licens
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-
21 */
22
23/*
24 * Extents support for EXT4
25 *
26 * TODO:
27 * - ext4*_error() should be used in some situations
28 * - analyze all BUG()/BUG_ON(), use -EIO where appropriate
29 * - smart tree reduction
30 */
31
Alex Tomasa86c6182006-10-11 01:21:03 -070032#include <linux/fs.h>
33#include <linux/time.h>
Mingming Caocd02ff02007-10-16 18:38:25 -040034#include <linux/jbd2.h>
Alex Tomasa86c6182006-10-11 01:21:03 -070035#include <linux/highuid.h>
36#include <linux/pagemap.h>
37#include <linux/quotaops.h>
38#include <linux/string.h>
39#include <linux/slab.h>
Alex Tomasa86c6182006-10-11 01:21:03 -070040#include <asm/uaccess.h>
Eric Sandeen6873fa02008-10-07 00:46:36 -040041#include <linux/fiemap.h>
Christoph Hellwig3dcf5452008-04-29 18:13:32 -040042#include "ext4_jbd2.h"
Theodore Ts'o4a092d72012-11-28 13:03:30 -050043#include "ext4_extents.h"
Tao Maf19d5872012-12-10 14:05:51 -050044#include "xattr.h"
Alex Tomasa86c6182006-10-11 01:21:03 -070045
Jiaying Zhang0562e0b2011-03-21 21:38:05 -040046#include <trace/events/ext4.h>
47
Lukas Czerner5f95d212012-03-19 23:03:19 -040048/*
49 * used by extent splitting.
50 */
51#define EXT4_EXT_MAY_ZEROOUT 0x1 /* safe to zeroout if split fails \
52 due to ENOSPC */
Lukas Czerner556615d2014-04-20 23:45:47 -040053#define EXT4_EXT_MARK_UNWRIT1 0x2 /* mark first half unwritten */
54#define EXT4_EXT_MARK_UNWRIT2 0x4 /* mark second half unwritten */
Lukas Czerner5f95d212012-03-19 23:03:19 -040055
Dmitry Monakhovdee1f972012-10-10 01:04:58 -040056#define EXT4_EXT_DATA_VALID1 0x8 /* first half contains valid data */
57#define EXT4_EXT_DATA_VALID2 0x10 /* second half contains valid data */
58
Darrick J. Wong7ac59902012-04-29 18:37:10 -040059static __le32 ext4_extent_block_csum(struct inode *inode,
60 struct ext4_extent_header *eh)
61{
62 struct ext4_inode_info *ei = EXT4_I(inode);
63 struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
64 __u32 csum;
65
66 csum = ext4_chksum(sbi, ei->i_csum_seed, (__u8 *)eh,
67 EXT4_EXTENT_TAIL_OFFSET(eh));
68 return cpu_to_le32(csum);
69}
70
71static int ext4_extent_block_csum_verify(struct inode *inode,
72 struct ext4_extent_header *eh)
73{
74 struct ext4_extent_tail *et;
75
Dmitry Monakhov9aa5d322014-10-13 03:36:16 -040076 if (!ext4_has_metadata_csum(inode->i_sb))
Darrick J. Wong7ac59902012-04-29 18:37:10 -040077 return 1;
78
79 et = find_ext4_extent_tail(eh);
80 if (et->et_checksum != ext4_extent_block_csum(inode, eh))
81 return 0;
82 return 1;
83}
84
85static void ext4_extent_block_csum_set(struct inode *inode,
86 struct ext4_extent_header *eh)
87{
88 struct ext4_extent_tail *et;
89
Dmitry Monakhov9aa5d322014-10-13 03:36:16 -040090 if (!ext4_has_metadata_csum(inode->i_sb))
Darrick J. Wong7ac59902012-04-29 18:37:10 -040091 return;
92
93 et = find_ext4_extent_tail(eh);
94 et->et_checksum = ext4_extent_block_csum(inode, eh);
95}
96
Allison Hendersond583fb82011-05-25 07:41:43 -040097static int ext4_split_extent(handle_t *handle,
98 struct inode *inode,
Theodore Ts'odfe50802014-09-01 14:37:09 -040099 struct ext4_ext_path **ppath,
Allison Hendersond583fb82011-05-25 07:41:43 -0400100 struct ext4_map_blocks *map,
101 int split_flag,
102 int flags);
103
Lukas Czerner5f95d212012-03-19 23:03:19 -0400104static int ext4_split_extent_at(handle_t *handle,
105 struct inode *inode,
Theodore Ts'odfe50802014-09-01 14:37:09 -0400106 struct ext4_ext_path **ppath,
Lukas Czerner5f95d212012-03-19 23:03:19 -0400107 ext4_lblk_t split,
108 int split_flag,
109 int flags);
110
Lukas Czerner91dd8c12012-11-28 12:32:26 -0500111static int ext4_find_delayed_extent(struct inode *inode,
Zheng Liu69eb33d2013-02-18 00:31:07 -0500112 struct extent_status *newes);
Lukas Czerner91dd8c12012-11-28 12:32:26 -0500113
Jan Kara487caee2009-08-17 22:17:20 -0400114static int ext4_ext_truncate_extend_restart(handle_t *handle,
115 struct inode *inode,
116 int needed)
Alex Tomasa86c6182006-10-11 01:21:03 -0700117{
118 int err;
119
Frank Mayhar03901312009-01-07 00:06:22 -0500120 if (!ext4_handle_valid(handle))
121 return 0;
Alex Tomasa86c6182006-10-11 01:21:03 -0700122 if (handle->h_buffer_credits > needed)
Shen Feng9102e4f2008-07-11 19:27:31 -0400123 return 0;
124 err = ext4_journal_extend(handle, needed);
Theodore Ts'o0123c932008-08-01 20:57:54 -0400125 if (err <= 0)
Shen Feng9102e4f2008-07-11 19:27:31 -0400126 return err;
Jan Kara487caee2009-08-17 22:17:20 -0400127 err = ext4_truncate_restart_trans(handle, inode, needed);
Dmitry Monakhov0617b832010-05-17 01:00:00 -0400128 if (err == 0)
129 err = -EAGAIN;
Jan Kara487caee2009-08-17 22:17:20 -0400130
131 return err;
Alex Tomasa86c6182006-10-11 01:21:03 -0700132}
133
134/*
135 * could return:
136 * - EROFS
137 * - ENOMEM
138 */
139static int ext4_ext_get_access(handle_t *handle, struct inode *inode,
140 struct ext4_ext_path *path)
141{
142 if (path->p_bh) {
143 /* path points to block */
liang xie5d601252014-05-12 22:06:43 -0400144 BUFFER_TRACE(path->p_bh, "get_write_access");
Alex Tomasa86c6182006-10-11 01:21:03 -0700145 return ext4_journal_get_write_access(handle, path->p_bh);
146 }
147 /* path points to leaf/index in inode body */
148 /* we use in-core data, no need to protect them */
149 return 0;
150}
151
152/*
153 * could return:
154 * - EROFS
155 * - ENOMEM
156 * - EIO
157 */
Darrick J. Wong26564972013-04-19 14:04:12 -0400158int __ext4_ext_dirty(const char *where, unsigned int line, handle_t *handle,
159 struct inode *inode, struct ext4_ext_path *path)
Alex Tomasa86c6182006-10-11 01:21:03 -0700160{
161 int err;
Dmitry Monakhov4b1f1662014-07-27 22:28:15 -0400162
163 WARN_ON(!rwsem_is_locked(&EXT4_I(inode)->i_data_sem));
Alex Tomasa86c6182006-10-11 01:21:03 -0700164 if (path->p_bh) {
Darrick J. Wong7ac59902012-04-29 18:37:10 -0400165 ext4_extent_block_csum_set(inode, ext_block_hdr(path->p_bh));
Alex Tomasa86c6182006-10-11 01:21:03 -0700166 /* path points to block */
Theodore Ts'o9ea7a0d2011-09-04 10:18:14 -0400167 err = __ext4_handle_dirty_metadata(where, line, handle,
168 inode, path->p_bh);
Alex Tomasa86c6182006-10-11 01:21:03 -0700169 } else {
170 /* path points to leaf/index in inode body */
171 err = ext4_mark_inode_dirty(handle, inode);
172 }
173 return err;
174}
175
Alex Tomasf65e6fb2006-10-11 01:21:05 -0700176static ext4_fsblk_t ext4_ext_find_goal(struct inode *inode,
Alex Tomasa86c6182006-10-11 01:21:03 -0700177 struct ext4_ext_path *path,
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -0500178 ext4_lblk_t block)
Alex Tomasa86c6182006-10-11 01:21:03 -0700179{
Alex Tomasa86c6182006-10-11 01:21:03 -0700180 if (path) {
Yongqiang Yang81fdbb42011-10-29 09:23:38 -0400181 int depth = path->p_depth;
Alex Tomasa86c6182006-10-11 01:21:03 -0700182 struct ext4_extent *ex;
Alex Tomasa86c6182006-10-11 01:21:03 -0700183
Kazuya Mioad4fb9c2011-01-10 12:12:28 -0500184 /*
185 * Try to predict block placement assuming that we are
186 * filling in a file which will eventually be
187 * non-sparse --- i.e., in the case of libbfd writing
188 * an ELF object sections out-of-order but in a way
189 * the eventually results in a contiguous object or
190 * executable file, or some database extending a table
191 * space file. However, this is actually somewhat
192 * non-ideal if we are writing a sparse file such as
193 * qemu or KVM writing a raw image file that is going
194 * to stay fairly sparse, since it will end up
195 * fragmenting the file system's free space. Maybe we
196 * should have some hueristics or some way to allow
197 * userspace to pass a hint to file system,
Tao Mab8d65682011-01-21 23:21:31 +0800198 * especially if the latter case turns out to be
Kazuya Mioad4fb9c2011-01-10 12:12:28 -0500199 * common.
200 */
Avantika Mathur7e028972006-12-06 20:41:33 -0800201 ex = path[depth].p_ext;
Kazuya Mioad4fb9c2011-01-10 12:12:28 -0500202 if (ex) {
203 ext4_fsblk_t ext_pblk = ext4_ext_pblock(ex);
204 ext4_lblk_t ext_block = le32_to_cpu(ex->ee_block);
205
206 if (block > ext_block)
207 return ext_pblk + (block - ext_block);
208 else
209 return ext_pblk - (ext_block - block);
210 }
Alex Tomasa86c6182006-10-11 01:21:03 -0700211
Randy Dunlapd0d856e2006-10-11 01:21:07 -0700212 /* it looks like index is empty;
213 * try to find starting block from index itself */
Alex Tomasa86c6182006-10-11 01:21:03 -0700214 if (path[depth].p_bh)
215 return path[depth].p_bh->b_blocknr;
216 }
217
218 /* OK. use inode's group */
Eric Sandeenf86186b2011-06-28 10:01:31 -0400219 return ext4_inode_to_goal_block(inode);
Alex Tomasa86c6182006-10-11 01:21:03 -0700220}
221
Aneesh Kumar K.V654b4902008-07-11 19:27:31 -0400222/*
223 * Allocation for a meta data block
224 */
Alex Tomasf65e6fb2006-10-11 01:21:05 -0700225static ext4_fsblk_t
Aneesh Kumar K.V654b4902008-07-11 19:27:31 -0400226ext4_ext_new_meta_block(handle_t *handle, struct inode *inode,
Alex Tomasa86c6182006-10-11 01:21:03 -0700227 struct ext4_ext_path *path,
Allison Henderson55f020d2011-05-25 07:41:26 -0400228 struct ext4_extent *ex, int *err, unsigned int flags)
Alex Tomasa86c6182006-10-11 01:21:03 -0700229{
Alex Tomasf65e6fb2006-10-11 01:21:05 -0700230 ext4_fsblk_t goal, newblock;
Alex Tomasa86c6182006-10-11 01:21:03 -0700231
232 goal = ext4_ext_find_goal(inode, path, le32_to_cpu(ex->ee_block));
Allison Henderson55f020d2011-05-25 07:41:26 -0400233 newblock = ext4_new_meta_blocks(handle, inode, goal, flags,
234 NULL, err);
Alex Tomasa86c6182006-10-11 01:21:03 -0700235 return newblock;
236}
237
Theodore Ts'o55ad63b2009-08-28 10:40:33 -0400238static inline int ext4_ext_space_block(struct inode *inode, int check)
Alex Tomasa86c6182006-10-11 01:21:03 -0700239{
240 int size;
241
242 size = (inode->i_sb->s_blocksize - sizeof(struct ext4_extent_header))
243 / sizeof(struct ext4_extent);
Robert P. J. Daybbf2f9f2007-02-17 19:20:16 +0100244#ifdef AGGRESSIVE_TEST
Yongqiang Yang02dc62fb2011-10-29 09:29:11 -0400245 if (!check && size > 6)
246 size = 6;
Alex Tomasa86c6182006-10-11 01:21:03 -0700247#endif
248 return size;
249}
250
Theodore Ts'o55ad63b2009-08-28 10:40:33 -0400251static inline int ext4_ext_space_block_idx(struct inode *inode, int check)
Alex Tomasa86c6182006-10-11 01:21:03 -0700252{
253 int size;
254
255 size = (inode->i_sb->s_blocksize - sizeof(struct ext4_extent_header))
256 / sizeof(struct ext4_extent_idx);
Robert P. J. Daybbf2f9f2007-02-17 19:20:16 +0100257#ifdef AGGRESSIVE_TEST
Yongqiang Yang02dc62fb2011-10-29 09:29:11 -0400258 if (!check && size > 5)
259 size = 5;
Alex Tomasa86c6182006-10-11 01:21:03 -0700260#endif
261 return size;
262}
263
Theodore Ts'o55ad63b2009-08-28 10:40:33 -0400264static inline int ext4_ext_space_root(struct inode *inode, int check)
Alex Tomasa86c6182006-10-11 01:21:03 -0700265{
266 int size;
267
268 size = sizeof(EXT4_I(inode)->i_data);
269 size -= sizeof(struct ext4_extent_header);
270 size /= sizeof(struct ext4_extent);
Robert P. J. Daybbf2f9f2007-02-17 19:20:16 +0100271#ifdef AGGRESSIVE_TEST
Yongqiang Yang02dc62fb2011-10-29 09:29:11 -0400272 if (!check && size > 3)
273 size = 3;
Alex Tomasa86c6182006-10-11 01:21:03 -0700274#endif
275 return size;
276}
277
Theodore Ts'o55ad63b2009-08-28 10:40:33 -0400278static inline int ext4_ext_space_root_idx(struct inode *inode, int check)
Alex Tomasa86c6182006-10-11 01:21:03 -0700279{
280 int size;
281
282 size = sizeof(EXT4_I(inode)->i_data);
283 size -= sizeof(struct ext4_extent_header);
284 size /= sizeof(struct ext4_extent_idx);
Robert P. J. Daybbf2f9f2007-02-17 19:20:16 +0100285#ifdef AGGRESSIVE_TEST
Yongqiang Yang02dc62fb2011-10-29 09:29:11 -0400286 if (!check && size > 4)
287 size = 4;
Alex Tomasa86c6182006-10-11 01:21:03 -0700288#endif
289 return size;
290}
291
Dmitry Monakhovfcf6b1b72014-08-30 23:52:19 -0400292static inline int
293ext4_force_split_extent_at(handle_t *handle, struct inode *inode,
Theodore Ts'odfe50802014-09-01 14:37:09 -0400294 struct ext4_ext_path **ppath, ext4_lblk_t lblk,
Dmitry Monakhovfcf6b1b72014-08-30 23:52:19 -0400295 int nofail)
296{
Theodore Ts'odfe50802014-09-01 14:37:09 -0400297 struct ext4_ext_path *path = *ppath;
Dmitry Monakhovfcf6b1b72014-08-30 23:52:19 -0400298 int unwritten = ext4_ext_is_unwritten(path[path->p_depth].p_ext);
299
Theodore Ts'odfe50802014-09-01 14:37:09 -0400300 return ext4_split_extent_at(handle, inode, ppath, lblk, unwritten ?
Dmitry Monakhovfcf6b1b72014-08-30 23:52:19 -0400301 EXT4_EXT_MARK_UNWRIT1|EXT4_EXT_MARK_UNWRIT2 : 0,
302 EXT4_EX_NOCACHE | EXT4_GET_BLOCKS_PRE_IO |
303 (nofail ? EXT4_GET_BLOCKS_METADATA_NOFAIL:0));
304}
305
Mingming Caod2a17632008-07-14 17:52:37 -0400306/*
307 * Calculate the number of metadata blocks needed
308 * to allocate @blocks
309 * Worse case is one block per extent
310 */
Theodore Ts'o01f49d02011-01-10 12:13:03 -0500311int ext4_ext_calc_metadata_amount(struct inode *inode, ext4_lblk_t lblock)
Mingming Caod2a17632008-07-14 17:52:37 -0400312{
Theodore Ts'o9d0be502010-01-01 02:41:30 -0500313 struct ext4_inode_info *ei = EXT4_I(inode);
Yongqiang Yang81fdbb42011-10-29 09:23:38 -0400314 int idxs;
Mingming Caod2a17632008-07-14 17:52:37 -0400315
Theodore Ts'o9d0be502010-01-01 02:41:30 -0500316 idxs = ((inode->i_sb->s_blocksize - sizeof(struct ext4_extent_header))
317 / sizeof(struct ext4_extent_idx));
Mingming Caod2a17632008-07-14 17:52:37 -0400318
319 /*
Theodore Ts'o9d0be502010-01-01 02:41:30 -0500320 * If the new delayed allocation block is contiguous with the
321 * previous da block, it can share index blocks with the
322 * previous block, so we only need to allocate a new index
323 * block every idxs leaf blocks. At ldxs**2 blocks, we need
324 * an additional index block, and at ldxs**3 blocks, yet
325 * another index blocks.
Mingming Caod2a17632008-07-14 17:52:37 -0400326 */
Theodore Ts'o9d0be502010-01-01 02:41:30 -0500327 if (ei->i_da_metadata_calc_len &&
328 ei->i_da_metadata_calc_last_lblock+1 == lblock) {
Yongqiang Yang81fdbb42011-10-29 09:23:38 -0400329 int num = 0;
330
Theodore Ts'o9d0be502010-01-01 02:41:30 -0500331 if ((ei->i_da_metadata_calc_len % idxs) == 0)
332 num++;
333 if ((ei->i_da_metadata_calc_len % (idxs*idxs)) == 0)
334 num++;
335 if ((ei->i_da_metadata_calc_len % (idxs*idxs*idxs)) == 0) {
336 num++;
337 ei->i_da_metadata_calc_len = 0;
338 } else
339 ei->i_da_metadata_calc_len++;
340 ei->i_da_metadata_calc_last_lblock++;
341 return num;
342 }
Mingming Caod2a17632008-07-14 17:52:37 -0400343
Theodore Ts'o9d0be502010-01-01 02:41:30 -0500344 /*
345 * In the worst case we need a new set of index blocks at
346 * every level of the inode's extent tree.
347 */
348 ei->i_da_metadata_calc_len = 1;
349 ei->i_da_metadata_calc_last_lblock = lblock;
350 return ext_depth(inode) + 1;
Mingming Caod2a17632008-07-14 17:52:37 -0400351}
352
Alex Tomasc29c0ae2007-07-18 09:19:09 -0400353static int
354ext4_ext_max_entries(struct inode *inode, int depth)
355{
356 int max;
357
358 if (depth == ext_depth(inode)) {
359 if (depth == 0)
Theodore Ts'o55ad63b2009-08-28 10:40:33 -0400360 max = ext4_ext_space_root(inode, 1);
Alex Tomasc29c0ae2007-07-18 09:19:09 -0400361 else
Theodore Ts'o55ad63b2009-08-28 10:40:33 -0400362 max = ext4_ext_space_root_idx(inode, 1);
Alex Tomasc29c0ae2007-07-18 09:19:09 -0400363 } else {
364 if (depth == 0)
Theodore Ts'o55ad63b2009-08-28 10:40:33 -0400365 max = ext4_ext_space_block(inode, 1);
Alex Tomasc29c0ae2007-07-18 09:19:09 -0400366 else
Theodore Ts'o55ad63b2009-08-28 10:40:33 -0400367 max = ext4_ext_space_block_idx(inode, 1);
Alex Tomasc29c0ae2007-07-18 09:19:09 -0400368 }
369
370 return max;
371}
372
Aneesh Kumar K.V56b19862009-03-12 09:51:20 -0400373static int ext4_valid_extent(struct inode *inode, struct ext4_extent *ext)
374{
Theodore Ts'obf89d162010-10-27 21:30:14 -0400375 ext4_fsblk_t block = ext4_ext_pblock(ext);
Aneesh Kumar K.V56b19862009-03-12 09:51:20 -0400376 int len = ext4_ext_get_actual_len(ext);
Eryu Guan5946d082013-12-03 21:22:21 -0500377 ext4_lblk_t lblock = le32_to_cpu(ext->ee_block);
378 ext4_lblk_t last = lblock + len - 1;
Theodore Ts'oe84a26c2009-04-22 20:52:25 -0400379
Eryu Guan5946d082013-12-03 21:22:21 -0500380 if (lblock > last)
Theodore Ts'o31d4f3a2012-03-11 23:30:16 -0400381 return 0;
Theodore Ts'o6fd058f2009-05-17 15:38:01 -0400382 return ext4_data_block_valid(EXT4_SB(inode->i_sb), block, len);
Aneesh Kumar K.V56b19862009-03-12 09:51:20 -0400383}
384
385static int ext4_valid_extent_idx(struct inode *inode,
386 struct ext4_extent_idx *ext_idx)
387{
Theodore Ts'obf89d162010-10-27 21:30:14 -0400388 ext4_fsblk_t block = ext4_idx_pblock(ext_idx);
Theodore Ts'oe84a26c2009-04-22 20:52:25 -0400389
Theodore Ts'o6fd058f2009-05-17 15:38:01 -0400390 return ext4_data_block_valid(EXT4_SB(inode->i_sb), block, 1);
Aneesh Kumar K.V56b19862009-03-12 09:51:20 -0400391}
392
393static int ext4_valid_extent_entries(struct inode *inode,
394 struct ext4_extent_header *eh,
395 int depth)
396{
Aneesh Kumar K.V56b19862009-03-12 09:51:20 -0400397 unsigned short entries;
398 if (eh->eh_entries == 0)
399 return 1;
400
401 entries = le16_to_cpu(eh->eh_entries);
402
403 if (depth == 0) {
404 /* leaf entries */
Yongqiang Yang81fdbb42011-10-29 09:23:38 -0400405 struct ext4_extent *ext = EXT_FIRST_EXTENT(eh);
Eryu Guan5946d082013-12-03 21:22:21 -0500406 struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
407 ext4_fsblk_t pblock = 0;
408 ext4_lblk_t lblock = 0;
409 ext4_lblk_t prev = 0;
410 int len = 0;
Aneesh Kumar K.V56b19862009-03-12 09:51:20 -0400411 while (entries) {
412 if (!ext4_valid_extent(inode, ext))
413 return 0;
Eryu Guan5946d082013-12-03 21:22:21 -0500414
415 /* Check for overlapping extents */
416 lblock = le32_to_cpu(ext->ee_block);
417 len = ext4_ext_get_actual_len(ext);
418 if ((lblock <= prev) && prev) {
419 pblock = ext4_ext_pblock(ext);
420 es->s_last_error_block = cpu_to_le64(pblock);
421 return 0;
422 }
Aneesh Kumar K.V56b19862009-03-12 09:51:20 -0400423 ext++;
424 entries--;
Eryu Guan5946d082013-12-03 21:22:21 -0500425 prev = lblock + len - 1;
Aneesh Kumar K.V56b19862009-03-12 09:51:20 -0400426 }
427 } else {
Yongqiang Yang81fdbb42011-10-29 09:23:38 -0400428 struct ext4_extent_idx *ext_idx = EXT_FIRST_INDEX(eh);
Aneesh Kumar K.V56b19862009-03-12 09:51:20 -0400429 while (entries) {
430 if (!ext4_valid_extent_idx(inode, ext_idx))
431 return 0;
432 ext_idx++;
433 entries--;
434 }
435 }
436 return 1;
437}
438
Theodore Ts'oc398eda2010-07-27 11:56:40 -0400439static int __ext4_ext_check(const char *function, unsigned int line,
440 struct inode *inode, struct ext4_extent_header *eh,
Theodore Ts'oc3491792013-08-16 21:21:41 -0400441 int depth, ext4_fsblk_t pblk)
Alex Tomasc29c0ae2007-07-18 09:19:09 -0400442{
443 const char *error_msg;
444 int max = 0;
445
446 if (unlikely(eh->eh_magic != EXT4_EXT_MAGIC)) {
447 error_msg = "invalid magic";
448 goto corrupted;
449 }
450 if (unlikely(le16_to_cpu(eh->eh_depth) != depth)) {
451 error_msg = "unexpected eh_depth";
452 goto corrupted;
453 }
454 if (unlikely(eh->eh_max == 0)) {
455 error_msg = "invalid eh_max";
456 goto corrupted;
457 }
458 max = ext4_ext_max_entries(inode, depth);
459 if (unlikely(le16_to_cpu(eh->eh_max) > max)) {
460 error_msg = "too large eh_max";
461 goto corrupted;
462 }
463 if (unlikely(le16_to_cpu(eh->eh_entries) > le16_to_cpu(eh->eh_max))) {
464 error_msg = "invalid eh_entries";
465 goto corrupted;
466 }
Aneesh Kumar K.V56b19862009-03-12 09:51:20 -0400467 if (!ext4_valid_extent_entries(inode, eh, depth)) {
468 error_msg = "invalid extent entries";
469 goto corrupted;
470 }
Darrick J. Wong7ac59902012-04-29 18:37:10 -0400471 /* Verify checksum on non-root extent tree nodes */
472 if (ext_depth(inode) != depth &&
473 !ext4_extent_block_csum_verify(inode, eh)) {
474 error_msg = "extent tree corrupted";
475 goto corrupted;
476 }
Alex Tomasc29c0ae2007-07-18 09:19:09 -0400477 return 0;
478
479corrupted:
Theodore Ts'oc398eda2010-07-27 11:56:40 -0400480 ext4_error_inode(inode, function, line, 0,
Theodore Ts'oc3491792013-08-16 21:21:41 -0400481 "pblk %llu bad header/extent: %s - magic %x, "
482 "entries %u, max %u(%u), depth %u(%u)",
483 (unsigned long long) pblk, error_msg,
484 le16_to_cpu(eh->eh_magic),
485 le16_to_cpu(eh->eh_entries), le16_to_cpu(eh->eh_max),
486 max, le16_to_cpu(eh->eh_depth), depth);
Alex Tomasc29c0ae2007-07-18 09:19:09 -0400487 return -EIO;
488}
489
Theodore Ts'oc3491792013-08-16 21:21:41 -0400490#define ext4_ext_check(inode, eh, depth, pblk) \
491 __ext4_ext_check(__func__, __LINE__, (inode), (eh), (depth), (pblk))
Alex Tomasc29c0ae2007-07-18 09:19:09 -0400492
Aneesh Kumar K.V7a262f72009-03-27 16:39:58 -0400493int ext4_ext_check_inode(struct inode *inode)
494{
Theodore Ts'oc3491792013-08-16 21:21:41 -0400495 return ext4_ext_check(inode, ext_inode_hdr(inode), ext_depth(inode), 0);
Aneesh Kumar K.V7a262f72009-03-27 16:39:58 -0400496}
497
Theodore Ts'o7d7ea892013-08-16 21:20:41 -0400498static struct buffer_head *
499__read_extent_tree_block(const char *function, unsigned int line,
Theodore Ts'o107a7bd2013-08-16 21:23:41 -0400500 struct inode *inode, ext4_fsblk_t pblk, int depth,
501 int flags)
Darrick J. Wongf8489122012-04-29 18:21:10 -0400502{
Theodore Ts'o7d7ea892013-08-16 21:20:41 -0400503 struct buffer_head *bh;
504 int err;
Darrick J. Wongf8489122012-04-29 18:21:10 -0400505
Theodore Ts'o7d7ea892013-08-16 21:20:41 -0400506 bh = sb_getblk(inode->i_sb, pblk);
507 if (unlikely(!bh))
508 return ERR_PTR(-ENOMEM);
509
510 if (!bh_uptodate_or_lock(bh)) {
511 trace_ext4_ext_load_extent(inode, pblk, _RET_IP_);
512 err = bh_submit_read(bh);
513 if (err < 0)
514 goto errout;
515 }
Theodore Ts'o7869a4a2013-08-16 22:05:14 -0400516 if (buffer_verified(bh) && !(flags & EXT4_EX_FORCE_CACHE))
Theodore Ts'o7d7ea892013-08-16 21:20:41 -0400517 return bh;
518 err = __ext4_ext_check(function, line, inode,
Theodore Ts'oc3491792013-08-16 21:21:41 -0400519 ext_block_hdr(bh), depth, pblk);
Theodore Ts'o7d7ea892013-08-16 21:20:41 -0400520 if (err)
521 goto errout;
Darrick J. Wongf8489122012-04-29 18:21:10 -0400522 set_buffer_verified(bh);
Theodore Ts'o107a7bd2013-08-16 21:23:41 -0400523 /*
524 * If this is a leaf block, cache all of its entries
525 */
526 if (!(flags & EXT4_EX_NOCACHE) && depth == 0) {
527 struct ext4_extent_header *eh = ext_block_hdr(bh);
528 struct ext4_extent *ex = EXT_FIRST_EXTENT(eh);
529 ext4_lblk_t prev = 0;
530 int i;
531
532 for (i = le16_to_cpu(eh->eh_entries); i > 0; i--, ex++) {
533 unsigned int status = EXTENT_STATUS_WRITTEN;
534 ext4_lblk_t lblk = le32_to_cpu(ex->ee_block);
535 int len = ext4_ext_get_actual_len(ex);
536
537 if (prev && (prev != lblk))
538 ext4_es_cache_extent(inode, prev,
539 lblk - prev, ~0,
540 EXTENT_STATUS_HOLE);
541
Lukas Czerner556615d2014-04-20 23:45:47 -0400542 if (ext4_ext_is_unwritten(ex))
Theodore Ts'o107a7bd2013-08-16 21:23:41 -0400543 status = EXTENT_STATUS_UNWRITTEN;
544 ext4_es_cache_extent(inode, lblk, len,
545 ext4_ext_pblock(ex), status);
546 prev = lblk + len;
547 }
548 }
Theodore Ts'o7d7ea892013-08-16 21:20:41 -0400549 return bh;
550errout:
551 put_bh(bh);
552 return ERR_PTR(err);
553
Darrick J. Wongf8489122012-04-29 18:21:10 -0400554}
555
Theodore Ts'o107a7bd2013-08-16 21:23:41 -0400556#define read_extent_tree_block(inode, pblk, depth, flags) \
557 __read_extent_tree_block(__func__, __LINE__, (inode), (pblk), \
558 (depth), (flags))
Darrick J. Wongf8489122012-04-29 18:21:10 -0400559
Theodore Ts'o7869a4a2013-08-16 22:05:14 -0400560/*
561 * This function is called to cache a file's extent information in the
562 * extent status tree
563 */
564int ext4_ext_precache(struct inode *inode)
565{
566 struct ext4_inode_info *ei = EXT4_I(inode);
567 struct ext4_ext_path *path = NULL;
568 struct buffer_head *bh;
569 int i = 0, depth, ret = 0;
570
571 if (!ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))
572 return 0; /* not an extent-mapped inode */
573
574 down_read(&ei->i_data_sem);
575 depth = ext_depth(inode);
576
577 path = kzalloc(sizeof(struct ext4_ext_path) * (depth + 1),
578 GFP_NOFS);
579 if (path == NULL) {
580 up_read(&ei->i_data_sem);
581 return -ENOMEM;
582 }
583
584 /* Don't cache anything if there are no external extent blocks */
585 if (depth == 0)
586 goto out;
587 path[0].p_hdr = ext_inode_hdr(inode);
588 ret = ext4_ext_check(inode, path[0].p_hdr, depth, 0);
589 if (ret)
590 goto out;
591 path[0].p_idx = EXT_FIRST_INDEX(path[0].p_hdr);
592 while (i >= 0) {
593 /*
594 * If this is a leaf block or we've reached the end of
595 * the index block, go up
596 */
597 if ((i == depth) ||
598 path[i].p_idx > EXT_LAST_INDEX(path[i].p_hdr)) {
599 brelse(path[i].p_bh);
600 path[i].p_bh = NULL;
601 i--;
602 continue;
603 }
604 bh = read_extent_tree_block(inode,
605 ext4_idx_pblock(path[i].p_idx++),
606 depth - i - 1,
607 EXT4_EX_FORCE_CACHE);
608 if (IS_ERR(bh)) {
609 ret = PTR_ERR(bh);
610 break;
611 }
612 i++;
613 path[i].p_bh = bh;
614 path[i].p_hdr = ext_block_hdr(bh);
615 path[i].p_idx = EXT_FIRST_INDEX(path[i].p_hdr);
616 }
617 ext4_set_inode_state(inode, EXT4_STATE_EXT_PRECACHED);
618out:
619 up_read(&ei->i_data_sem);
620 ext4_ext_drop_refs(path);
621 kfree(path);
622 return ret;
623}
624
Alex Tomasa86c6182006-10-11 01:21:03 -0700625#ifdef EXT_DEBUG
626static void ext4_ext_show_path(struct inode *inode, struct ext4_ext_path *path)
627{
628 int k, l = path->p_depth;
629
630 ext_debug("path:");
631 for (k = 0; k <= l; k++, path++) {
632 if (path->p_idx) {
Mingming Cao2ae02102006-10-11 01:21:11 -0700633 ext_debug(" %d->%llu", le32_to_cpu(path->p_idx->ei_block),
Theodore Ts'obf89d162010-10-27 21:30:14 -0400634 ext4_idx_pblock(path->p_idx));
Alex Tomasa86c6182006-10-11 01:21:03 -0700635 } else if (path->p_ext) {
Mingming553f9002009-09-18 13:34:55 -0400636 ext_debug(" %d:[%d]%d:%llu ",
Alex Tomasa86c6182006-10-11 01:21:03 -0700637 le32_to_cpu(path->p_ext->ee_block),
Lukas Czerner556615d2014-04-20 23:45:47 -0400638 ext4_ext_is_unwritten(path->p_ext),
Amit Aroraa2df2a62007-07-17 21:42:41 -0400639 ext4_ext_get_actual_len(path->p_ext),
Theodore Ts'obf89d162010-10-27 21:30:14 -0400640 ext4_ext_pblock(path->p_ext));
Alex Tomasa86c6182006-10-11 01:21:03 -0700641 } else
642 ext_debug(" []");
643 }
644 ext_debug("\n");
645}
646
647static void ext4_ext_show_leaf(struct inode *inode, struct ext4_ext_path *path)
648{
649 int depth = ext_depth(inode);
650 struct ext4_extent_header *eh;
651 struct ext4_extent *ex;
652 int i;
653
654 if (!path)
655 return;
656
657 eh = path[depth].p_hdr;
658 ex = EXT_FIRST_EXTENT(eh);
659
Mingming553f9002009-09-18 13:34:55 -0400660 ext_debug("Displaying leaf extents for inode %lu\n", inode->i_ino);
661
Alex Tomasa86c6182006-10-11 01:21:03 -0700662 for (i = 0; i < le16_to_cpu(eh->eh_entries); i++, ex++) {
Mingming553f9002009-09-18 13:34:55 -0400663 ext_debug("%d:[%d]%d:%llu ", le32_to_cpu(ex->ee_block),
Lukas Czerner556615d2014-04-20 23:45:47 -0400664 ext4_ext_is_unwritten(ex),
Theodore Ts'obf89d162010-10-27 21:30:14 -0400665 ext4_ext_get_actual_len(ex), ext4_ext_pblock(ex));
Alex Tomasa86c6182006-10-11 01:21:03 -0700666 }
667 ext_debug("\n");
668}
Yongqiang Yang1b16da72011-05-25 17:41:48 -0400669
670static void ext4_ext_show_move(struct inode *inode, struct ext4_ext_path *path,
671 ext4_fsblk_t newblock, int level)
672{
673 int depth = ext_depth(inode);
674 struct ext4_extent *ex;
675
676 if (depth != level) {
677 struct ext4_extent_idx *idx;
678 idx = path[level].p_idx;
679 while (idx <= EXT_MAX_INDEX(path[level].p_hdr)) {
680 ext_debug("%d: move %d:%llu in new index %llu\n", level,
681 le32_to_cpu(idx->ei_block),
682 ext4_idx_pblock(idx),
683 newblock);
684 idx++;
685 }
686
687 return;
688 }
689
690 ex = path[depth].p_ext;
691 while (ex <= EXT_MAX_EXTENT(path[depth].p_hdr)) {
692 ext_debug("move %d:%llu:[%d]%d in new leaf %llu\n",
693 le32_to_cpu(ex->ee_block),
694 ext4_ext_pblock(ex),
Lukas Czerner556615d2014-04-20 23:45:47 -0400695 ext4_ext_is_unwritten(ex),
Yongqiang Yang1b16da72011-05-25 17:41:48 -0400696 ext4_ext_get_actual_len(ex),
697 newblock);
698 ex++;
699 }
700}
701
Alex Tomasa86c6182006-10-11 01:21:03 -0700702#else
Theodore Ts'oaf5bc922008-09-08 22:25:24 -0400703#define ext4_ext_show_path(inode, path)
704#define ext4_ext_show_leaf(inode, path)
Yongqiang Yang1b16da72011-05-25 17:41:48 -0400705#define ext4_ext_show_move(inode, path, newblock, level)
Alex Tomasa86c6182006-10-11 01:21:03 -0700706#endif
707
Aneesh Kumar K.Vb35905c2008-02-25 16:54:37 -0500708void ext4_ext_drop_refs(struct ext4_ext_path *path)
Alex Tomasa86c6182006-10-11 01:21:03 -0700709{
Theodore Ts'ob7ea89a2014-09-01 14:39:09 -0400710 int depth, i;
Alex Tomasa86c6182006-10-11 01:21:03 -0700711
Theodore Ts'ob7ea89a2014-09-01 14:39:09 -0400712 if (!path)
713 return;
714 depth = path->p_depth;
Alex Tomasa86c6182006-10-11 01:21:03 -0700715 for (i = 0; i <= depth; i++, path++)
716 if (path->p_bh) {
717 brelse(path->p_bh);
718 path->p_bh = NULL;
719 }
720}
721
722/*
Randy Dunlapd0d856e2006-10-11 01:21:07 -0700723 * ext4_ext_binsearch_idx:
724 * binary search for the closest index of the given block
Alex Tomasc29c0ae2007-07-18 09:19:09 -0400725 * the header must be checked before calling this
Alex Tomasa86c6182006-10-11 01:21:03 -0700726 */
727static void
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -0500728ext4_ext_binsearch_idx(struct inode *inode,
729 struct ext4_ext_path *path, ext4_lblk_t block)
Alex Tomasa86c6182006-10-11 01:21:03 -0700730{
731 struct ext4_extent_header *eh = path->p_hdr;
732 struct ext4_extent_idx *r, *l, *m;
733
Alex Tomasa86c6182006-10-11 01:21:03 -0700734
Eric Sandeenbba90742008-01-28 23:58:27 -0500735 ext_debug("binsearch for %u(idx): ", block);
Alex Tomasa86c6182006-10-11 01:21:03 -0700736
737 l = EXT_FIRST_INDEX(eh) + 1;
Dmitry Monakhove9f410b2007-07-18 09:09:15 -0400738 r = EXT_LAST_INDEX(eh);
Alex Tomasa86c6182006-10-11 01:21:03 -0700739 while (l <= r) {
740 m = l + (r - l) / 2;
741 if (block < le32_to_cpu(m->ei_block))
742 r = m - 1;
743 else
744 l = m + 1;
Dmitry Monakhov26d535e2007-07-18 08:33:37 -0400745 ext_debug("%p(%u):%p(%u):%p(%u) ", l, le32_to_cpu(l->ei_block),
746 m, le32_to_cpu(m->ei_block),
747 r, le32_to_cpu(r->ei_block));
Alex Tomasa86c6182006-10-11 01:21:03 -0700748 }
749
750 path->p_idx = l - 1;
Zheng Liu4a3c3a52012-05-28 17:55:16 -0400751 ext_debug(" -> %u->%lld ", le32_to_cpu(path->p_idx->ei_block),
Theodore Ts'obf89d162010-10-27 21:30:14 -0400752 ext4_idx_pblock(path->p_idx));
Alex Tomasa86c6182006-10-11 01:21:03 -0700753
754#ifdef CHECK_BINSEARCH
755 {
756 struct ext4_extent_idx *chix, *ix;
757 int k;
758
759 chix = ix = EXT_FIRST_INDEX(eh);
760 for (k = 0; k < le16_to_cpu(eh->eh_entries); k++, ix++) {
761 if (k != 0 &&
762 le32_to_cpu(ix->ei_block) <= le32_to_cpu(ix[-1].ei_block)) {
Theodore Ts'o4776004f2008-09-08 23:00:52 -0400763 printk(KERN_DEBUG "k=%d, ix=0x%p, "
764 "first=0x%p\n", k,
765 ix, EXT_FIRST_INDEX(eh));
766 printk(KERN_DEBUG "%u <= %u\n",
Alex Tomasa86c6182006-10-11 01:21:03 -0700767 le32_to_cpu(ix->ei_block),
768 le32_to_cpu(ix[-1].ei_block));
769 }
770 BUG_ON(k && le32_to_cpu(ix->ei_block)
Dave Kleikamp8c55e202007-05-24 13:04:54 -0400771 <= le32_to_cpu(ix[-1].ei_block));
Alex Tomasa86c6182006-10-11 01:21:03 -0700772 if (block < le32_to_cpu(ix->ei_block))
773 break;
774 chix = ix;
775 }
776 BUG_ON(chix != path->p_idx);
777 }
778#endif
779
780}
781
782/*
Randy Dunlapd0d856e2006-10-11 01:21:07 -0700783 * ext4_ext_binsearch:
784 * binary search for closest extent of the given block
Alex Tomasc29c0ae2007-07-18 09:19:09 -0400785 * the header must be checked before calling this
Alex Tomasa86c6182006-10-11 01:21:03 -0700786 */
787static void
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -0500788ext4_ext_binsearch(struct inode *inode,
789 struct ext4_ext_path *path, ext4_lblk_t block)
Alex Tomasa86c6182006-10-11 01:21:03 -0700790{
791 struct ext4_extent_header *eh = path->p_hdr;
792 struct ext4_extent *r, *l, *m;
793
Alex Tomasa86c6182006-10-11 01:21:03 -0700794 if (eh->eh_entries == 0) {
795 /*
Randy Dunlapd0d856e2006-10-11 01:21:07 -0700796 * this leaf is empty:
797 * we get such a leaf in split/add case
Alex Tomasa86c6182006-10-11 01:21:03 -0700798 */
799 return;
800 }
801
Eric Sandeenbba90742008-01-28 23:58:27 -0500802 ext_debug("binsearch for %u: ", block);
Alex Tomasa86c6182006-10-11 01:21:03 -0700803
804 l = EXT_FIRST_EXTENT(eh) + 1;
Dmitry Monakhove9f410b2007-07-18 09:09:15 -0400805 r = EXT_LAST_EXTENT(eh);
Alex Tomasa86c6182006-10-11 01:21:03 -0700806
807 while (l <= r) {
808 m = l + (r - l) / 2;
809 if (block < le32_to_cpu(m->ee_block))
810 r = m - 1;
811 else
812 l = m + 1;
Dmitry Monakhov26d535e2007-07-18 08:33:37 -0400813 ext_debug("%p(%u):%p(%u):%p(%u) ", l, le32_to_cpu(l->ee_block),
814 m, le32_to_cpu(m->ee_block),
815 r, le32_to_cpu(r->ee_block));
Alex Tomasa86c6182006-10-11 01:21:03 -0700816 }
817
818 path->p_ext = l - 1;
Mingming553f9002009-09-18 13:34:55 -0400819 ext_debug(" -> %d:%llu:[%d]%d ",
Dave Kleikamp8c55e202007-05-24 13:04:54 -0400820 le32_to_cpu(path->p_ext->ee_block),
Theodore Ts'obf89d162010-10-27 21:30:14 -0400821 ext4_ext_pblock(path->p_ext),
Lukas Czerner556615d2014-04-20 23:45:47 -0400822 ext4_ext_is_unwritten(path->p_ext),
Amit Aroraa2df2a62007-07-17 21:42:41 -0400823 ext4_ext_get_actual_len(path->p_ext));
Alex Tomasa86c6182006-10-11 01:21:03 -0700824
825#ifdef CHECK_BINSEARCH
826 {
827 struct ext4_extent *chex, *ex;
828 int k;
829
830 chex = ex = EXT_FIRST_EXTENT(eh);
831 for (k = 0; k < le16_to_cpu(eh->eh_entries); k++, ex++) {
832 BUG_ON(k && le32_to_cpu(ex->ee_block)
Dave Kleikamp8c55e202007-05-24 13:04:54 -0400833 <= le32_to_cpu(ex[-1].ee_block));
Alex Tomasa86c6182006-10-11 01:21:03 -0700834 if (block < le32_to_cpu(ex->ee_block))
835 break;
836 chex = ex;
837 }
838 BUG_ON(chex != path->p_ext);
839 }
840#endif
841
842}
843
844int ext4_ext_tree_init(handle_t *handle, struct inode *inode)
845{
846 struct ext4_extent_header *eh;
847
848 eh = ext_inode_hdr(inode);
849 eh->eh_depth = 0;
850 eh->eh_entries = 0;
851 eh->eh_magic = EXT4_EXT_MAGIC;
Theodore Ts'o55ad63b2009-08-28 10:40:33 -0400852 eh->eh_max = cpu_to_le16(ext4_ext_space_root(inode, 0));
Alex Tomasa86c6182006-10-11 01:21:03 -0700853 ext4_mark_inode_dirty(handle, inode);
Alex Tomasa86c6182006-10-11 01:21:03 -0700854 return 0;
855}
856
857struct ext4_ext_path *
Theodore Ts'oed8a1a72014-09-01 14:43:09 -0400858ext4_find_extent(struct inode *inode, ext4_lblk_t block,
859 struct ext4_ext_path **orig_path, int flags)
Alex Tomasa86c6182006-10-11 01:21:03 -0700860{
861 struct ext4_extent_header *eh;
862 struct buffer_head *bh;
Theodore Ts'o705912c2014-09-01 14:34:09 -0400863 struct ext4_ext_path *path = orig_path ? *orig_path : NULL;
864 short int depth, i, ppos = 0;
Theodore Ts'o860d21e2013-01-12 16:19:36 -0500865 int ret;
Alex Tomasa86c6182006-10-11 01:21:03 -0700866
867 eh = ext_inode_hdr(inode);
Alex Tomasc29c0ae2007-07-18 09:19:09 -0400868 depth = ext_depth(inode);
Alex Tomasa86c6182006-10-11 01:21:03 -0700869
Theodore Ts'o10809df82014-09-01 14:40:09 -0400870 if (path) {
Theodore Ts'o523f4312014-09-01 14:38:09 -0400871 ext4_ext_drop_refs(path);
Theodore Ts'o10809df82014-09-01 14:40:09 -0400872 if (depth > path[0].p_maxdepth) {
873 kfree(path);
874 *orig_path = path = NULL;
875 }
876 }
877 if (!path) {
Theodore Ts'o523f4312014-09-01 14:38:09 -0400878 /* account possible depth increase */
Avantika Mathur5d4958f2006-12-06 20:41:35 -0800879 path = kzalloc(sizeof(struct ext4_ext_path) * (depth + 2),
Alex Tomasa86c6182006-10-11 01:21:03 -0700880 GFP_NOFS);
Theodore Ts'o19008f62014-08-31 15:03:14 -0400881 if (unlikely(!path))
Alex Tomasa86c6182006-10-11 01:21:03 -0700882 return ERR_PTR(-ENOMEM);
Theodore Ts'o10809df82014-09-01 14:40:09 -0400883 path[0].p_maxdepth = depth + 1;
Alex Tomasa86c6182006-10-11 01:21:03 -0700884 }
Alex Tomasa86c6182006-10-11 01:21:03 -0700885 path[0].p_hdr = eh;
Shen Feng1973adc2008-07-11 19:27:31 -0400886 path[0].p_bh = NULL;
Alex Tomasa86c6182006-10-11 01:21:03 -0700887
Alex Tomasc29c0ae2007-07-18 09:19:09 -0400888 i = depth;
Alex Tomasa86c6182006-10-11 01:21:03 -0700889 /* walk through the tree */
890 while (i) {
891 ext_debug("depth %d: num %d, max %d\n",
892 ppos, le16_to_cpu(eh->eh_entries), le16_to_cpu(eh->eh_max));
Alex Tomasc29c0ae2007-07-18 09:19:09 -0400893
Alex Tomasa86c6182006-10-11 01:21:03 -0700894 ext4_ext_binsearch_idx(inode, path + ppos, block);
Theodore Ts'obf89d162010-10-27 21:30:14 -0400895 path[ppos].p_block = ext4_idx_pblock(path[ppos].p_idx);
Alex Tomasa86c6182006-10-11 01:21:03 -0700896 path[ppos].p_depth = i;
897 path[ppos].p_ext = NULL;
898
Theodore Ts'o107a7bd2013-08-16 21:23:41 -0400899 bh = read_extent_tree_block(inode, path[ppos].p_block, --i,
900 flags);
Theodore Ts'o19008f62014-08-31 15:03:14 -0400901 if (unlikely(IS_ERR(bh))) {
Theodore Ts'o7d7ea892013-08-16 21:20:41 -0400902 ret = PTR_ERR(bh);
Alex Tomasa86c6182006-10-11 01:21:03 -0700903 goto err;
Theodore Ts'o860d21e2013-01-12 16:19:36 -0500904 }
Theodore Ts'o7d7ea892013-08-16 21:20:41 -0400905
Alex Tomasa86c6182006-10-11 01:21:03 -0700906 eh = ext_block_hdr(bh);
907 ppos++;
Frank Mayhar273df552010-03-02 11:46:09 -0500908 if (unlikely(ppos > depth)) {
909 put_bh(bh);
910 EXT4_ERROR_INODE(inode,
911 "ppos %d > depth %d", ppos, depth);
Theodore Ts'o860d21e2013-01-12 16:19:36 -0500912 ret = -EIO;
Frank Mayhar273df552010-03-02 11:46:09 -0500913 goto err;
914 }
Alex Tomasa86c6182006-10-11 01:21:03 -0700915 path[ppos].p_bh = bh;
916 path[ppos].p_hdr = eh;
Alex Tomasa86c6182006-10-11 01:21:03 -0700917 }
918
919 path[ppos].p_depth = i;
Alex Tomasa86c6182006-10-11 01:21:03 -0700920 path[ppos].p_ext = NULL;
921 path[ppos].p_idx = NULL;
922
Alex Tomasa86c6182006-10-11 01:21:03 -0700923 /* find extent */
924 ext4_ext_binsearch(inode, path + ppos, block);
Shen Feng1973adc2008-07-11 19:27:31 -0400925 /* if not an empty leaf */
926 if (path[ppos].p_ext)
Theodore Ts'obf89d162010-10-27 21:30:14 -0400927 path[ppos].p_block = ext4_ext_pblock(path[ppos].p_ext);
Alex Tomasa86c6182006-10-11 01:21:03 -0700928
929 ext4_ext_show_path(inode, path);
930
931 return path;
932
933err:
934 ext4_ext_drop_refs(path);
Theodore Ts'odfe50802014-09-01 14:37:09 -0400935 kfree(path);
936 if (orig_path)
937 *orig_path = NULL;
Theodore Ts'o860d21e2013-01-12 16:19:36 -0500938 return ERR_PTR(ret);
Alex Tomasa86c6182006-10-11 01:21:03 -0700939}
940
941/*
Randy Dunlapd0d856e2006-10-11 01:21:07 -0700942 * ext4_ext_insert_index:
943 * insert new index [@logical;@ptr] into the block at @curp;
944 * check where to insert: before @curp or after @curp
Alex Tomasa86c6182006-10-11 01:21:03 -0700945 */
Theodore Ts'o1f109d52010-10-27 21:30:14 -0400946static int ext4_ext_insert_index(handle_t *handle, struct inode *inode,
947 struct ext4_ext_path *curp,
948 int logical, ext4_fsblk_t ptr)
Alex Tomasa86c6182006-10-11 01:21:03 -0700949{
950 struct ext4_extent_idx *ix;
951 int len, err;
952
Avantika Mathur7e028972006-12-06 20:41:33 -0800953 err = ext4_ext_get_access(handle, inode, curp);
954 if (err)
Alex Tomasa86c6182006-10-11 01:21:03 -0700955 return err;
956
Frank Mayhar273df552010-03-02 11:46:09 -0500957 if (unlikely(logical == le32_to_cpu(curp->p_idx->ei_block))) {
958 EXT4_ERROR_INODE(inode,
959 "logical %d == ei_block %d!",
960 logical, le32_to_cpu(curp->p_idx->ei_block));
961 return -EIO;
962 }
Robin Dongd4620312011-07-17 23:43:42 -0400963
964 if (unlikely(le16_to_cpu(curp->p_hdr->eh_entries)
965 >= le16_to_cpu(curp->p_hdr->eh_max))) {
966 EXT4_ERROR_INODE(inode,
967 "eh_entries %d >= eh_max %d!",
968 le16_to_cpu(curp->p_hdr->eh_entries),
969 le16_to_cpu(curp->p_hdr->eh_max));
970 return -EIO;
971 }
972
Alex Tomasa86c6182006-10-11 01:21:03 -0700973 if (logical > le32_to_cpu(curp->p_idx->ei_block)) {
974 /* insert after */
Eric Gouriou80e675f2011-10-27 11:52:18 -0400975 ext_debug("insert new index %d after: %llu\n", logical, ptr);
Alex Tomasa86c6182006-10-11 01:21:03 -0700976 ix = curp->p_idx + 1;
977 } else {
978 /* insert before */
Eric Gouriou80e675f2011-10-27 11:52:18 -0400979 ext_debug("insert new index %d before: %llu\n", logical, ptr);
Alex Tomasa86c6182006-10-11 01:21:03 -0700980 ix = curp->p_idx;
981 }
982
Eric Gouriou80e675f2011-10-27 11:52:18 -0400983 len = EXT_LAST_INDEX(curp->p_hdr) - ix + 1;
984 BUG_ON(len < 0);
985 if (len > 0) {
986 ext_debug("insert new index %d: "
987 "move %d indices from 0x%p to 0x%p\n",
988 logical, len, ix, ix + 1);
989 memmove(ix + 1, ix, len * sizeof(struct ext4_extent_idx));
990 }
991
Tao Maf472e022011-10-17 10:13:46 -0400992 if (unlikely(ix > EXT_MAX_INDEX(curp->p_hdr))) {
993 EXT4_ERROR_INODE(inode, "ix > EXT_MAX_INDEX!");
994 return -EIO;
995 }
996
Alex Tomasa86c6182006-10-11 01:21:03 -0700997 ix->ei_block = cpu_to_le32(logical);
Alex Tomasf65e6fb2006-10-11 01:21:05 -0700998 ext4_idx_store_pblock(ix, ptr);
Marcin Slusarze8546d02008-04-17 10:38:59 -0400999 le16_add_cpu(&curp->p_hdr->eh_entries, 1);
Alex Tomasa86c6182006-10-11 01:21:03 -07001000
Frank Mayhar273df552010-03-02 11:46:09 -05001001 if (unlikely(ix > EXT_LAST_INDEX(curp->p_hdr))) {
1002 EXT4_ERROR_INODE(inode, "ix > EXT_LAST_INDEX!");
1003 return -EIO;
1004 }
Alex Tomasa86c6182006-10-11 01:21:03 -07001005
1006 err = ext4_ext_dirty(handle, inode, curp);
1007 ext4_std_error(inode->i_sb, err);
1008
1009 return err;
1010}
1011
1012/*
Randy Dunlapd0d856e2006-10-11 01:21:07 -07001013 * ext4_ext_split:
1014 * inserts new subtree into the path, using free index entry
1015 * at depth @at:
1016 * - allocates all needed blocks (new leaf and all intermediate index blocks)
1017 * - makes decision where to split
1018 * - moves remaining extents and index entries (right to the split point)
1019 * into the newly allocated blocks
1020 * - initializes subtree
Alex Tomasa86c6182006-10-11 01:21:03 -07001021 */
1022static int ext4_ext_split(handle_t *handle, struct inode *inode,
Allison Henderson55f020d2011-05-25 07:41:26 -04001023 unsigned int flags,
1024 struct ext4_ext_path *path,
1025 struct ext4_extent *newext, int at)
Alex Tomasa86c6182006-10-11 01:21:03 -07001026{
1027 struct buffer_head *bh = NULL;
1028 int depth = ext_depth(inode);
1029 struct ext4_extent_header *neh;
1030 struct ext4_extent_idx *fidx;
Alex Tomasa86c6182006-10-11 01:21:03 -07001031 int i = at, k, m, a;
Alex Tomasf65e6fb2006-10-11 01:21:05 -07001032 ext4_fsblk_t newblock, oldblock;
Alex Tomasa86c6182006-10-11 01:21:03 -07001033 __le32 border;
Alex Tomasf65e6fb2006-10-11 01:21:05 -07001034 ext4_fsblk_t *ablocks = NULL; /* array of allocated blocks */
Alex Tomasa86c6182006-10-11 01:21:03 -07001035 int err = 0;
1036
1037 /* make decision: where to split? */
Randy Dunlapd0d856e2006-10-11 01:21:07 -07001038 /* FIXME: now decision is simplest: at current extent */
Alex Tomasa86c6182006-10-11 01:21:03 -07001039
Randy Dunlapd0d856e2006-10-11 01:21:07 -07001040 /* if current leaf will be split, then we should use
Alex Tomasa86c6182006-10-11 01:21:03 -07001041 * border from split point */
Frank Mayhar273df552010-03-02 11:46:09 -05001042 if (unlikely(path[depth].p_ext > EXT_MAX_EXTENT(path[depth].p_hdr))) {
1043 EXT4_ERROR_INODE(inode, "p_ext > EXT_MAX_EXTENT!");
1044 return -EIO;
1045 }
Alex Tomasa86c6182006-10-11 01:21:03 -07001046 if (path[depth].p_ext != EXT_MAX_EXTENT(path[depth].p_hdr)) {
1047 border = path[depth].p_ext[1].ee_block;
Randy Dunlapd0d856e2006-10-11 01:21:07 -07001048 ext_debug("leaf will be split."
Alex Tomasa86c6182006-10-11 01:21:03 -07001049 " next leaf starts at %d\n",
Dave Kleikamp8c55e202007-05-24 13:04:54 -04001050 le32_to_cpu(border));
Alex Tomasa86c6182006-10-11 01:21:03 -07001051 } else {
1052 border = newext->ee_block;
1053 ext_debug("leaf will be added."
1054 " next leaf starts at %d\n",
Dave Kleikamp8c55e202007-05-24 13:04:54 -04001055 le32_to_cpu(border));
Alex Tomasa86c6182006-10-11 01:21:03 -07001056 }
1057
1058 /*
Randy Dunlapd0d856e2006-10-11 01:21:07 -07001059 * If error occurs, then we break processing
1060 * and mark filesystem read-only. index won't
Alex Tomasa86c6182006-10-11 01:21:03 -07001061 * be inserted and tree will be in consistent
Randy Dunlapd0d856e2006-10-11 01:21:07 -07001062 * state. Next mount will repair buffers too.
Alex Tomasa86c6182006-10-11 01:21:03 -07001063 */
1064
1065 /*
Randy Dunlapd0d856e2006-10-11 01:21:07 -07001066 * Get array to track all allocated blocks.
1067 * We need this to handle errors and free blocks
1068 * upon them.
Alex Tomasa86c6182006-10-11 01:21:03 -07001069 */
Avantika Mathur5d4958f2006-12-06 20:41:35 -08001070 ablocks = kzalloc(sizeof(ext4_fsblk_t) * depth, GFP_NOFS);
Alex Tomasa86c6182006-10-11 01:21:03 -07001071 if (!ablocks)
1072 return -ENOMEM;
Alex Tomasa86c6182006-10-11 01:21:03 -07001073
1074 /* allocate all needed blocks */
1075 ext_debug("allocate %d blocks for indexes/leaf\n", depth - at);
1076 for (a = 0; a < depth - at; a++) {
Aneesh Kumar K.V654b4902008-07-11 19:27:31 -04001077 newblock = ext4_ext_new_meta_block(handle, inode, path,
Allison Henderson55f020d2011-05-25 07:41:26 -04001078 newext, &err, flags);
Alex Tomasa86c6182006-10-11 01:21:03 -07001079 if (newblock == 0)
1080 goto cleanup;
1081 ablocks[a] = newblock;
1082 }
1083
1084 /* initialize new leaf */
1085 newblock = ablocks[--a];
Frank Mayhar273df552010-03-02 11:46:09 -05001086 if (unlikely(newblock == 0)) {
1087 EXT4_ERROR_INODE(inode, "newblock == 0!");
1088 err = -EIO;
1089 goto cleanup;
1090 }
Alex Tomasa86c6182006-10-11 01:21:03 -07001091 bh = sb_getblk(inode->i_sb, newblock);
Wang Shilongaebf0242013-01-12 16:28:47 -05001092 if (unlikely(!bh)) {
Theodore Ts'o860d21e2013-01-12 16:19:36 -05001093 err = -ENOMEM;
Alex Tomasa86c6182006-10-11 01:21:03 -07001094 goto cleanup;
1095 }
1096 lock_buffer(bh);
1097
Avantika Mathur7e028972006-12-06 20:41:33 -08001098 err = ext4_journal_get_create_access(handle, bh);
1099 if (err)
Alex Tomasa86c6182006-10-11 01:21:03 -07001100 goto cleanup;
1101
1102 neh = ext_block_hdr(bh);
1103 neh->eh_entries = 0;
Theodore Ts'o55ad63b2009-08-28 10:40:33 -04001104 neh->eh_max = cpu_to_le16(ext4_ext_space_block(inode, 0));
Alex Tomasa86c6182006-10-11 01:21:03 -07001105 neh->eh_magic = EXT4_EXT_MAGIC;
1106 neh->eh_depth = 0;
Alex Tomasa86c6182006-10-11 01:21:03 -07001107
Randy Dunlapd0d856e2006-10-11 01:21:07 -07001108 /* move remainder of path[depth] to the new leaf */
Frank Mayhar273df552010-03-02 11:46:09 -05001109 if (unlikely(path[depth].p_hdr->eh_entries !=
1110 path[depth].p_hdr->eh_max)) {
1111 EXT4_ERROR_INODE(inode, "eh_entries %d != eh_max %d!",
1112 path[depth].p_hdr->eh_entries,
1113 path[depth].p_hdr->eh_max);
1114 err = -EIO;
1115 goto cleanup;
1116 }
Alex Tomasa86c6182006-10-11 01:21:03 -07001117 /* start copy from next extent */
Yongqiang Yang1b16da72011-05-25 17:41:48 -04001118 m = EXT_MAX_EXTENT(path[depth].p_hdr) - path[depth].p_ext++;
1119 ext4_ext_show_move(inode, path, newblock, depth);
Alex Tomasa86c6182006-10-11 01:21:03 -07001120 if (m) {
Yongqiang Yang1b16da72011-05-25 17:41:48 -04001121 struct ext4_extent *ex;
1122 ex = EXT_FIRST_EXTENT(neh);
1123 memmove(ex, path[depth].p_ext, sizeof(struct ext4_extent) * m);
Marcin Slusarze8546d02008-04-17 10:38:59 -04001124 le16_add_cpu(&neh->eh_entries, m);
Alex Tomasa86c6182006-10-11 01:21:03 -07001125 }
1126
Darrick J. Wong7ac59902012-04-29 18:37:10 -04001127 ext4_extent_block_csum_set(inode, neh);
Alex Tomasa86c6182006-10-11 01:21:03 -07001128 set_buffer_uptodate(bh);
1129 unlock_buffer(bh);
1130
Frank Mayhar03901312009-01-07 00:06:22 -05001131 err = ext4_handle_dirty_metadata(handle, inode, bh);
Avantika Mathur7e028972006-12-06 20:41:33 -08001132 if (err)
Alex Tomasa86c6182006-10-11 01:21:03 -07001133 goto cleanup;
1134 brelse(bh);
1135 bh = NULL;
1136
1137 /* correct old leaf */
1138 if (m) {
Avantika Mathur7e028972006-12-06 20:41:33 -08001139 err = ext4_ext_get_access(handle, inode, path + depth);
1140 if (err)
Alex Tomasa86c6182006-10-11 01:21:03 -07001141 goto cleanup;
Marcin Slusarze8546d02008-04-17 10:38:59 -04001142 le16_add_cpu(&path[depth].p_hdr->eh_entries, -m);
Avantika Mathur7e028972006-12-06 20:41:33 -08001143 err = ext4_ext_dirty(handle, inode, path + depth);
1144 if (err)
Alex Tomasa86c6182006-10-11 01:21:03 -07001145 goto cleanup;
1146
1147 }
1148
1149 /* create intermediate indexes */
1150 k = depth - at - 1;
Frank Mayhar273df552010-03-02 11:46:09 -05001151 if (unlikely(k < 0)) {
1152 EXT4_ERROR_INODE(inode, "k %d < 0!", k);
1153 err = -EIO;
1154 goto cleanup;
1155 }
Alex Tomasa86c6182006-10-11 01:21:03 -07001156 if (k)
1157 ext_debug("create %d intermediate indices\n", k);
1158 /* insert new index into current index block */
1159 /* current depth stored in i var */
1160 i = depth - 1;
1161 while (k--) {
1162 oldblock = newblock;
1163 newblock = ablocks[--a];
Eric Sandeenbba90742008-01-28 23:58:27 -05001164 bh = sb_getblk(inode->i_sb, newblock);
Wang Shilongaebf0242013-01-12 16:28:47 -05001165 if (unlikely(!bh)) {
Theodore Ts'o860d21e2013-01-12 16:19:36 -05001166 err = -ENOMEM;
Alex Tomasa86c6182006-10-11 01:21:03 -07001167 goto cleanup;
1168 }
1169 lock_buffer(bh);
1170
Avantika Mathur7e028972006-12-06 20:41:33 -08001171 err = ext4_journal_get_create_access(handle, bh);
1172 if (err)
Alex Tomasa86c6182006-10-11 01:21:03 -07001173 goto cleanup;
1174
1175 neh = ext_block_hdr(bh);
1176 neh->eh_entries = cpu_to_le16(1);
1177 neh->eh_magic = EXT4_EXT_MAGIC;
Theodore Ts'o55ad63b2009-08-28 10:40:33 -04001178 neh->eh_max = cpu_to_le16(ext4_ext_space_block_idx(inode, 0));
Alex Tomasa86c6182006-10-11 01:21:03 -07001179 neh->eh_depth = cpu_to_le16(depth - i);
1180 fidx = EXT_FIRST_INDEX(neh);
1181 fidx->ei_block = border;
Alex Tomasf65e6fb2006-10-11 01:21:05 -07001182 ext4_idx_store_pblock(fidx, oldblock);
Alex Tomasa86c6182006-10-11 01:21:03 -07001183
Eric Sandeenbba90742008-01-28 23:58:27 -05001184 ext_debug("int.index at %d (block %llu): %u -> %llu\n",
1185 i, newblock, le32_to_cpu(border), oldblock);
Alex Tomasa86c6182006-10-11 01:21:03 -07001186
Yongqiang Yang1b16da72011-05-25 17:41:48 -04001187 /* move remainder of path[i] to the new index block */
Frank Mayhar273df552010-03-02 11:46:09 -05001188 if (unlikely(EXT_MAX_INDEX(path[i].p_hdr) !=
1189 EXT_LAST_INDEX(path[i].p_hdr))) {
1190 EXT4_ERROR_INODE(inode,
1191 "EXT_MAX_INDEX != EXT_LAST_INDEX ee_block %d!",
1192 le32_to_cpu(path[i].p_ext->ee_block));
1193 err = -EIO;
1194 goto cleanup;
1195 }
Yongqiang Yang1b16da72011-05-25 17:41:48 -04001196 /* start copy indexes */
1197 m = EXT_MAX_INDEX(path[i].p_hdr) - path[i].p_idx++;
1198 ext_debug("cur 0x%p, last 0x%p\n", path[i].p_idx,
1199 EXT_MAX_INDEX(path[i].p_hdr));
1200 ext4_ext_show_move(inode, path, newblock, i);
Alex Tomasa86c6182006-10-11 01:21:03 -07001201 if (m) {
Yongqiang Yang1b16da72011-05-25 17:41:48 -04001202 memmove(++fidx, path[i].p_idx,
Alex Tomasa86c6182006-10-11 01:21:03 -07001203 sizeof(struct ext4_extent_idx) * m);
Marcin Slusarze8546d02008-04-17 10:38:59 -04001204 le16_add_cpu(&neh->eh_entries, m);
Alex Tomasa86c6182006-10-11 01:21:03 -07001205 }
Darrick J. Wong7ac59902012-04-29 18:37:10 -04001206 ext4_extent_block_csum_set(inode, neh);
Alex Tomasa86c6182006-10-11 01:21:03 -07001207 set_buffer_uptodate(bh);
1208 unlock_buffer(bh);
1209
Frank Mayhar03901312009-01-07 00:06:22 -05001210 err = ext4_handle_dirty_metadata(handle, inode, bh);
Avantika Mathur7e028972006-12-06 20:41:33 -08001211 if (err)
Alex Tomasa86c6182006-10-11 01:21:03 -07001212 goto cleanup;
1213 brelse(bh);
1214 bh = NULL;
1215
1216 /* correct old index */
1217 if (m) {
1218 err = ext4_ext_get_access(handle, inode, path + i);
1219 if (err)
1220 goto cleanup;
Marcin Slusarze8546d02008-04-17 10:38:59 -04001221 le16_add_cpu(&path[i].p_hdr->eh_entries, -m);
Alex Tomasa86c6182006-10-11 01:21:03 -07001222 err = ext4_ext_dirty(handle, inode, path + i);
1223 if (err)
1224 goto cleanup;
1225 }
1226
1227 i--;
1228 }
1229
1230 /* insert new index */
Alex Tomasa86c6182006-10-11 01:21:03 -07001231 err = ext4_ext_insert_index(handle, inode, path + at,
1232 le32_to_cpu(border), newblock);
1233
1234cleanup:
1235 if (bh) {
1236 if (buffer_locked(bh))
1237 unlock_buffer(bh);
1238 brelse(bh);
1239 }
1240
1241 if (err) {
1242 /* free all allocated blocks in error case */
1243 for (i = 0; i < depth; i++) {
1244 if (!ablocks[i])
1245 continue;
Peter Huewe7dc57612011-02-21 21:01:42 -05001246 ext4_free_blocks(handle, inode, NULL, ablocks[i], 1,
Theodore Ts'oe6362602009-11-23 07:17:05 -05001247 EXT4_FREE_BLOCKS_METADATA);
Alex Tomasa86c6182006-10-11 01:21:03 -07001248 }
1249 }
1250 kfree(ablocks);
1251
1252 return err;
1253}
1254
1255/*
Randy Dunlapd0d856e2006-10-11 01:21:07 -07001256 * ext4_ext_grow_indepth:
1257 * implements tree growing procedure:
1258 * - allocates new block
1259 * - moves top-level data (index block or leaf) into the new block
1260 * - initializes new top-level, creating index that points to the
1261 * just created block
Alex Tomasa86c6182006-10-11 01:21:03 -07001262 */
1263static int ext4_ext_grow_indepth(handle_t *handle, struct inode *inode,
Dmitry Monakhovbe5cd902014-10-01 22:57:09 -04001264 unsigned int flags)
Alex Tomasa86c6182006-10-11 01:21:03 -07001265{
Alex Tomasa86c6182006-10-11 01:21:03 -07001266 struct ext4_extent_header *neh;
Alex Tomasa86c6182006-10-11 01:21:03 -07001267 struct buffer_head *bh;
Dmitry Monakhovbe5cd902014-10-01 22:57:09 -04001268 ext4_fsblk_t newblock, goal = 0;
1269 struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
Alex Tomasa86c6182006-10-11 01:21:03 -07001270 int err = 0;
1271
Dmitry Monakhovbe5cd902014-10-01 22:57:09 -04001272 /* Try to prepend new index to old one */
1273 if (ext_depth(inode))
1274 goal = ext4_idx_pblock(EXT_FIRST_INDEX(ext_inode_hdr(inode)));
1275 if (goal > le32_to_cpu(es->s_first_data_block)) {
1276 flags |= EXT4_MB_HINT_TRY_GOAL;
1277 goal--;
1278 } else
1279 goal = ext4_inode_to_goal_block(inode);
1280 newblock = ext4_new_meta_blocks(handle, inode, goal, flags,
1281 NULL, &err);
Alex Tomasa86c6182006-10-11 01:21:03 -07001282 if (newblock == 0)
1283 return err;
1284
1285 bh = sb_getblk(inode->i_sb, newblock);
Wang Shilongaebf0242013-01-12 16:28:47 -05001286 if (unlikely(!bh))
Theodore Ts'o860d21e2013-01-12 16:19:36 -05001287 return -ENOMEM;
Alex Tomasa86c6182006-10-11 01:21:03 -07001288 lock_buffer(bh);
1289
Avantika Mathur7e028972006-12-06 20:41:33 -08001290 err = ext4_journal_get_create_access(handle, bh);
1291 if (err) {
Alex Tomasa86c6182006-10-11 01:21:03 -07001292 unlock_buffer(bh);
1293 goto out;
1294 }
1295
1296 /* move top-level index/leaf into new block */
Dmitry Monakhov1939dd82011-10-22 01:26:05 -04001297 memmove(bh->b_data, EXT4_I(inode)->i_data,
1298 sizeof(EXT4_I(inode)->i_data));
Alex Tomasa86c6182006-10-11 01:21:03 -07001299
1300 /* set size of new block */
1301 neh = ext_block_hdr(bh);
1302 /* old root could have indexes or leaves
1303 * so calculate e_max right way */
1304 if (ext_depth(inode))
Theodore Ts'o55ad63b2009-08-28 10:40:33 -04001305 neh->eh_max = cpu_to_le16(ext4_ext_space_block_idx(inode, 0));
Alex Tomasa86c6182006-10-11 01:21:03 -07001306 else
Theodore Ts'o55ad63b2009-08-28 10:40:33 -04001307 neh->eh_max = cpu_to_le16(ext4_ext_space_block(inode, 0));
Alex Tomasa86c6182006-10-11 01:21:03 -07001308 neh->eh_magic = EXT4_EXT_MAGIC;
Darrick J. Wong7ac59902012-04-29 18:37:10 -04001309 ext4_extent_block_csum_set(inode, neh);
Alex Tomasa86c6182006-10-11 01:21:03 -07001310 set_buffer_uptodate(bh);
1311 unlock_buffer(bh);
1312
Frank Mayhar03901312009-01-07 00:06:22 -05001313 err = ext4_handle_dirty_metadata(handle, inode, bh);
Avantika Mathur7e028972006-12-06 20:41:33 -08001314 if (err)
Alex Tomasa86c6182006-10-11 01:21:03 -07001315 goto out;
1316
Dmitry Monakhov1939dd82011-10-22 01:26:05 -04001317 /* Update top-level index: num,max,pointer */
Alex Tomasa86c6182006-10-11 01:21:03 -07001318 neh = ext_inode_hdr(inode);
Dmitry Monakhov1939dd82011-10-22 01:26:05 -04001319 neh->eh_entries = cpu_to_le16(1);
1320 ext4_idx_store_pblock(EXT_FIRST_INDEX(neh), newblock);
1321 if (neh->eh_depth == 0) {
1322 /* Root extent block becomes index block */
1323 neh->eh_max = cpu_to_le16(ext4_ext_space_root_idx(inode, 0));
1324 EXT_FIRST_INDEX(neh)->ei_block =
1325 EXT_FIRST_EXTENT(neh)->ee_block;
1326 }
Mingming Cao2ae02102006-10-11 01:21:11 -07001327 ext_debug("new root: num %d(%d), lblock %d, ptr %llu\n",
Alex Tomasa86c6182006-10-11 01:21:03 -07001328 le16_to_cpu(neh->eh_entries), le16_to_cpu(neh->eh_max),
Andi Kleen5a0790c2010-06-14 13:28:03 -04001329 le32_to_cpu(EXT_FIRST_INDEX(neh)->ei_block),
Theodore Ts'obf89d162010-10-27 21:30:14 -04001330 ext4_idx_pblock(EXT_FIRST_INDEX(neh)));
Alex Tomasa86c6182006-10-11 01:21:03 -07001331
Wei Yongjunba39ebb2012-09-27 09:37:53 -04001332 le16_add_cpu(&neh->eh_depth, 1);
Dmitry Monakhov1939dd82011-10-22 01:26:05 -04001333 ext4_mark_inode_dirty(handle, inode);
Alex Tomasa86c6182006-10-11 01:21:03 -07001334out:
1335 brelse(bh);
1336
1337 return err;
1338}
1339
1340/*
Randy Dunlapd0d856e2006-10-11 01:21:07 -07001341 * ext4_ext_create_new_leaf:
1342 * finds empty index and adds new leaf.
1343 * if no free index is found, then it requests in-depth growing.
Alex Tomasa86c6182006-10-11 01:21:03 -07001344 */
1345static int ext4_ext_create_new_leaf(handle_t *handle, struct inode *inode,
Theodore Ts'o107a7bd2013-08-16 21:23:41 -04001346 unsigned int mb_flags,
1347 unsigned int gb_flags,
Theodore Ts'odfe50802014-09-01 14:37:09 -04001348 struct ext4_ext_path **ppath,
Allison Henderson55f020d2011-05-25 07:41:26 -04001349 struct ext4_extent *newext)
Alex Tomasa86c6182006-10-11 01:21:03 -07001350{
Theodore Ts'odfe50802014-09-01 14:37:09 -04001351 struct ext4_ext_path *path = *ppath;
Alex Tomasa86c6182006-10-11 01:21:03 -07001352 struct ext4_ext_path *curp;
1353 int depth, i, err = 0;
1354
1355repeat:
1356 i = depth = ext_depth(inode);
1357
1358 /* walk up to the tree and look for free index entry */
1359 curp = path + depth;
1360 while (i > 0 && !EXT_HAS_FREE_INDEX(curp)) {
1361 i--;
1362 curp--;
1363 }
1364
Randy Dunlapd0d856e2006-10-11 01:21:07 -07001365 /* we use already allocated block for index block,
1366 * so subsequent data blocks should be contiguous */
Alex Tomasa86c6182006-10-11 01:21:03 -07001367 if (EXT_HAS_FREE_INDEX(curp)) {
1368 /* if we found index with free entry, then use that
1369 * entry: create all needed subtree and add new leaf */
Theodore Ts'o107a7bd2013-08-16 21:23:41 -04001370 err = ext4_ext_split(handle, inode, mb_flags, path, newext, i);
Shen Feng787e0982008-07-11 19:27:31 -04001371 if (err)
1372 goto out;
Alex Tomasa86c6182006-10-11 01:21:03 -07001373
1374 /* refill path */
Theodore Ts'oed8a1a72014-09-01 14:43:09 -04001375 path = ext4_find_extent(inode,
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05001376 (ext4_lblk_t)le32_to_cpu(newext->ee_block),
Theodore Ts'odfe50802014-09-01 14:37:09 -04001377 ppath, gb_flags);
Alex Tomasa86c6182006-10-11 01:21:03 -07001378 if (IS_ERR(path))
1379 err = PTR_ERR(path);
1380 } else {
1381 /* tree is full, time to grow in depth */
Dmitry Monakhovbe5cd902014-10-01 22:57:09 -04001382 err = ext4_ext_grow_indepth(handle, inode, mb_flags);
Alex Tomasa86c6182006-10-11 01:21:03 -07001383 if (err)
1384 goto out;
1385
1386 /* refill path */
Theodore Ts'oed8a1a72014-09-01 14:43:09 -04001387 path = ext4_find_extent(inode,
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05001388 (ext4_lblk_t)le32_to_cpu(newext->ee_block),
Theodore Ts'odfe50802014-09-01 14:37:09 -04001389 ppath, gb_flags);
Alex Tomasa86c6182006-10-11 01:21:03 -07001390 if (IS_ERR(path)) {
1391 err = PTR_ERR(path);
1392 goto out;
1393 }
1394
1395 /*
Randy Dunlapd0d856e2006-10-11 01:21:07 -07001396 * only first (depth 0 -> 1) produces free space;
1397 * in all other cases we have to split the grown tree
Alex Tomasa86c6182006-10-11 01:21:03 -07001398 */
1399 depth = ext_depth(inode);
1400 if (path[depth].p_hdr->eh_entries == path[depth].p_hdr->eh_max) {
Randy Dunlapd0d856e2006-10-11 01:21:07 -07001401 /* now we need to split */
Alex Tomasa86c6182006-10-11 01:21:03 -07001402 goto repeat;
1403 }
1404 }
1405
1406out:
1407 return err;
1408}
1409
1410/*
Alex Tomas1988b512008-01-28 23:58:27 -05001411 * search the closest allocated block to the left for *logical
1412 * and returns it at @logical + it's physical address at @phys
1413 * if *logical is the smallest allocated block, the function
1414 * returns 0 at @phys
1415 * return value contains 0 (success) or error code
1416 */
Theodore Ts'o1f109d52010-10-27 21:30:14 -04001417static int ext4_ext_search_left(struct inode *inode,
1418 struct ext4_ext_path *path,
1419 ext4_lblk_t *logical, ext4_fsblk_t *phys)
Alex Tomas1988b512008-01-28 23:58:27 -05001420{
1421 struct ext4_extent_idx *ix;
1422 struct ext4_extent *ex;
Aneesh Kumar K.Vb939e372008-01-28 23:58:27 -05001423 int depth, ee_len;
Alex Tomas1988b512008-01-28 23:58:27 -05001424
Frank Mayhar273df552010-03-02 11:46:09 -05001425 if (unlikely(path == NULL)) {
1426 EXT4_ERROR_INODE(inode, "path == NULL *logical %d!", *logical);
1427 return -EIO;
1428 }
Alex Tomas1988b512008-01-28 23:58:27 -05001429 depth = path->p_depth;
1430 *phys = 0;
1431
1432 if (depth == 0 && path->p_ext == NULL)
1433 return 0;
1434
1435 /* usually extent in the path covers blocks smaller
1436 * then *logical, but it can be that extent is the
1437 * first one in the file */
1438
1439 ex = path[depth].p_ext;
Aneesh Kumar K.Vb939e372008-01-28 23:58:27 -05001440 ee_len = ext4_ext_get_actual_len(ex);
Alex Tomas1988b512008-01-28 23:58:27 -05001441 if (*logical < le32_to_cpu(ex->ee_block)) {
Frank Mayhar273df552010-03-02 11:46:09 -05001442 if (unlikely(EXT_FIRST_EXTENT(path[depth].p_hdr) != ex)) {
1443 EXT4_ERROR_INODE(inode,
1444 "EXT_FIRST_EXTENT != ex *logical %d ee_block %d!",
1445 *logical, le32_to_cpu(ex->ee_block));
1446 return -EIO;
1447 }
Alex Tomas1988b512008-01-28 23:58:27 -05001448 while (--depth >= 0) {
1449 ix = path[depth].p_idx;
Frank Mayhar273df552010-03-02 11:46:09 -05001450 if (unlikely(ix != EXT_FIRST_INDEX(path[depth].p_hdr))) {
1451 EXT4_ERROR_INODE(inode,
1452 "ix (%d) != EXT_FIRST_INDEX (%d) (depth %d)!",
Tao Ma6ee3b212011-10-08 16:08:34 -04001453 ix != NULL ? le32_to_cpu(ix->ei_block) : 0,
Frank Mayhar273df552010-03-02 11:46:09 -05001454 EXT_FIRST_INDEX(path[depth].p_hdr) != NULL ?
Tao Ma6ee3b212011-10-08 16:08:34 -04001455 le32_to_cpu(EXT_FIRST_INDEX(path[depth].p_hdr)->ei_block) : 0,
Frank Mayhar273df552010-03-02 11:46:09 -05001456 depth);
1457 return -EIO;
1458 }
Alex Tomas1988b512008-01-28 23:58:27 -05001459 }
1460 return 0;
1461 }
1462
Frank Mayhar273df552010-03-02 11:46:09 -05001463 if (unlikely(*logical < (le32_to_cpu(ex->ee_block) + ee_len))) {
1464 EXT4_ERROR_INODE(inode,
1465 "logical %d < ee_block %d + ee_len %d!",
1466 *logical, le32_to_cpu(ex->ee_block), ee_len);
1467 return -EIO;
1468 }
Alex Tomas1988b512008-01-28 23:58:27 -05001469
Aneesh Kumar K.Vb939e372008-01-28 23:58:27 -05001470 *logical = le32_to_cpu(ex->ee_block) + ee_len - 1;
Theodore Ts'obf89d162010-10-27 21:30:14 -04001471 *phys = ext4_ext_pblock(ex) + ee_len - 1;
Alex Tomas1988b512008-01-28 23:58:27 -05001472 return 0;
1473}
1474
1475/*
1476 * search the closest allocated block to the right for *logical
1477 * and returns it at @logical + it's physical address at @phys
Tao Madf3ab172011-10-08 15:53:49 -04001478 * if *logical is the largest allocated block, the function
Alex Tomas1988b512008-01-28 23:58:27 -05001479 * returns 0 at @phys
1480 * return value contains 0 (success) or error code
1481 */
Theodore Ts'o1f109d52010-10-27 21:30:14 -04001482static int ext4_ext_search_right(struct inode *inode,
1483 struct ext4_ext_path *path,
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04001484 ext4_lblk_t *logical, ext4_fsblk_t *phys,
1485 struct ext4_extent **ret_ex)
Alex Tomas1988b512008-01-28 23:58:27 -05001486{
1487 struct buffer_head *bh = NULL;
1488 struct ext4_extent_header *eh;
1489 struct ext4_extent_idx *ix;
1490 struct ext4_extent *ex;
1491 ext4_fsblk_t block;
Eric Sandeen395a87b2009-03-10 18:18:47 -04001492 int depth; /* Note, NOT eh_depth; depth from top of tree */
1493 int ee_len;
Alex Tomas1988b512008-01-28 23:58:27 -05001494
Frank Mayhar273df552010-03-02 11:46:09 -05001495 if (unlikely(path == NULL)) {
1496 EXT4_ERROR_INODE(inode, "path == NULL *logical %d!", *logical);
1497 return -EIO;
1498 }
Alex Tomas1988b512008-01-28 23:58:27 -05001499 depth = path->p_depth;
1500 *phys = 0;
1501
1502 if (depth == 0 && path->p_ext == NULL)
1503 return 0;
1504
1505 /* usually extent in the path covers blocks smaller
1506 * then *logical, but it can be that extent is the
1507 * first one in the file */
1508
1509 ex = path[depth].p_ext;
Aneesh Kumar K.Vb939e372008-01-28 23:58:27 -05001510 ee_len = ext4_ext_get_actual_len(ex);
Alex Tomas1988b512008-01-28 23:58:27 -05001511 if (*logical < le32_to_cpu(ex->ee_block)) {
Frank Mayhar273df552010-03-02 11:46:09 -05001512 if (unlikely(EXT_FIRST_EXTENT(path[depth].p_hdr) != ex)) {
1513 EXT4_ERROR_INODE(inode,
1514 "first_extent(path[%d].p_hdr) != ex",
1515 depth);
1516 return -EIO;
1517 }
Alex Tomas1988b512008-01-28 23:58:27 -05001518 while (--depth >= 0) {
1519 ix = path[depth].p_idx;
Frank Mayhar273df552010-03-02 11:46:09 -05001520 if (unlikely(ix != EXT_FIRST_INDEX(path[depth].p_hdr))) {
1521 EXT4_ERROR_INODE(inode,
1522 "ix != EXT_FIRST_INDEX *logical %d!",
1523 *logical);
1524 return -EIO;
1525 }
Alex Tomas1988b512008-01-28 23:58:27 -05001526 }
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04001527 goto found_extent;
Alex Tomas1988b512008-01-28 23:58:27 -05001528 }
1529
Frank Mayhar273df552010-03-02 11:46:09 -05001530 if (unlikely(*logical < (le32_to_cpu(ex->ee_block) + ee_len))) {
1531 EXT4_ERROR_INODE(inode,
1532 "logical %d < ee_block %d + ee_len %d!",
1533 *logical, le32_to_cpu(ex->ee_block), ee_len);
1534 return -EIO;
1535 }
Alex Tomas1988b512008-01-28 23:58:27 -05001536
1537 if (ex != EXT_LAST_EXTENT(path[depth].p_hdr)) {
1538 /* next allocated block in this leaf */
1539 ex++;
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04001540 goto found_extent;
Alex Tomas1988b512008-01-28 23:58:27 -05001541 }
1542
1543 /* go up and search for index to the right */
1544 while (--depth >= 0) {
1545 ix = path[depth].p_idx;
1546 if (ix != EXT_LAST_INDEX(path[depth].p_hdr))
Wu Fengguang25f1ee32008-11-25 17:24:23 -05001547 goto got_index;
Alex Tomas1988b512008-01-28 23:58:27 -05001548 }
1549
Wu Fengguang25f1ee32008-11-25 17:24:23 -05001550 /* we've gone up to the root and found no index to the right */
1551 return 0;
Alex Tomas1988b512008-01-28 23:58:27 -05001552
Wu Fengguang25f1ee32008-11-25 17:24:23 -05001553got_index:
Alex Tomas1988b512008-01-28 23:58:27 -05001554 /* we've found index to the right, let's
1555 * follow it and find the closest allocated
1556 * block to the right */
1557 ix++;
Theodore Ts'obf89d162010-10-27 21:30:14 -04001558 block = ext4_idx_pblock(ix);
Alex Tomas1988b512008-01-28 23:58:27 -05001559 while (++depth < path->p_depth) {
Eric Sandeen395a87b2009-03-10 18:18:47 -04001560 /* subtract from p_depth to get proper eh_depth */
Theodore Ts'o7d7ea892013-08-16 21:20:41 -04001561 bh = read_extent_tree_block(inode, block,
Theodore Ts'o107a7bd2013-08-16 21:23:41 -04001562 path->p_depth - depth, 0);
Theodore Ts'o7d7ea892013-08-16 21:20:41 -04001563 if (IS_ERR(bh))
1564 return PTR_ERR(bh);
1565 eh = ext_block_hdr(bh);
Alex Tomas1988b512008-01-28 23:58:27 -05001566 ix = EXT_FIRST_INDEX(eh);
Theodore Ts'obf89d162010-10-27 21:30:14 -04001567 block = ext4_idx_pblock(ix);
Alex Tomas1988b512008-01-28 23:58:27 -05001568 put_bh(bh);
1569 }
1570
Theodore Ts'o107a7bd2013-08-16 21:23:41 -04001571 bh = read_extent_tree_block(inode, block, path->p_depth - depth, 0);
Theodore Ts'o7d7ea892013-08-16 21:20:41 -04001572 if (IS_ERR(bh))
1573 return PTR_ERR(bh);
Alex Tomas1988b512008-01-28 23:58:27 -05001574 eh = ext_block_hdr(bh);
Alex Tomas1988b512008-01-28 23:58:27 -05001575 ex = EXT_FIRST_EXTENT(eh);
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04001576found_extent:
Alex Tomas1988b512008-01-28 23:58:27 -05001577 *logical = le32_to_cpu(ex->ee_block);
Theodore Ts'obf89d162010-10-27 21:30:14 -04001578 *phys = ext4_ext_pblock(ex);
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04001579 *ret_ex = ex;
1580 if (bh)
1581 put_bh(bh);
Alex Tomas1988b512008-01-28 23:58:27 -05001582 return 0;
Alex Tomas1988b512008-01-28 23:58:27 -05001583}
1584
1585/*
Randy Dunlapd0d856e2006-10-11 01:21:07 -07001586 * ext4_ext_next_allocated_block:
Lukas Czernerf17722f2011-06-06 00:05:17 -04001587 * returns allocated block in subsequent extent or EXT_MAX_BLOCKS.
Randy Dunlapd0d856e2006-10-11 01:21:07 -07001588 * NOTE: it considers block number from index entry as
1589 * allocated block. Thus, index entries have to be consistent
1590 * with leaves.
Alex Tomasa86c6182006-10-11 01:21:03 -07001591 */
Dmitry Monakhovfcf6b1b72014-08-30 23:52:19 -04001592ext4_lblk_t
Alex Tomasa86c6182006-10-11 01:21:03 -07001593ext4_ext_next_allocated_block(struct ext4_ext_path *path)
1594{
1595 int depth;
1596
1597 BUG_ON(path == NULL);
1598 depth = path->p_depth;
1599
1600 if (depth == 0 && path->p_ext == NULL)
Lukas Czernerf17722f2011-06-06 00:05:17 -04001601 return EXT_MAX_BLOCKS;
Alex Tomasa86c6182006-10-11 01:21:03 -07001602
1603 while (depth >= 0) {
1604 if (depth == path->p_depth) {
1605 /* leaf */
Curt Wohlgemuth6f8ff532011-10-26 04:38:59 -04001606 if (path[depth].p_ext &&
1607 path[depth].p_ext !=
Alex Tomasa86c6182006-10-11 01:21:03 -07001608 EXT_LAST_EXTENT(path[depth].p_hdr))
1609 return le32_to_cpu(path[depth].p_ext[1].ee_block);
1610 } else {
1611 /* index */
1612 if (path[depth].p_idx !=
1613 EXT_LAST_INDEX(path[depth].p_hdr))
1614 return le32_to_cpu(path[depth].p_idx[1].ei_block);
1615 }
1616 depth--;
1617 }
1618
Lukas Czernerf17722f2011-06-06 00:05:17 -04001619 return EXT_MAX_BLOCKS;
Alex Tomasa86c6182006-10-11 01:21:03 -07001620}
1621
1622/*
Randy Dunlapd0d856e2006-10-11 01:21:07 -07001623 * ext4_ext_next_leaf_block:
Lukas Czernerf17722f2011-06-06 00:05:17 -04001624 * returns first allocated block from next leaf or EXT_MAX_BLOCKS
Alex Tomasa86c6182006-10-11 01:21:03 -07001625 */
Robin Dong57187892011-07-23 21:49:07 -04001626static ext4_lblk_t ext4_ext_next_leaf_block(struct ext4_ext_path *path)
Alex Tomasa86c6182006-10-11 01:21:03 -07001627{
1628 int depth;
1629
1630 BUG_ON(path == NULL);
1631 depth = path->p_depth;
1632
1633 /* zero-tree has no leaf blocks at all */
1634 if (depth == 0)
Lukas Czernerf17722f2011-06-06 00:05:17 -04001635 return EXT_MAX_BLOCKS;
Alex Tomasa86c6182006-10-11 01:21:03 -07001636
1637 /* go to index block */
1638 depth--;
1639
1640 while (depth >= 0) {
1641 if (path[depth].p_idx !=
1642 EXT_LAST_INDEX(path[depth].p_hdr))
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05001643 return (ext4_lblk_t)
1644 le32_to_cpu(path[depth].p_idx[1].ei_block);
Alex Tomasa86c6182006-10-11 01:21:03 -07001645 depth--;
1646 }
1647
Lukas Czernerf17722f2011-06-06 00:05:17 -04001648 return EXT_MAX_BLOCKS;
Alex Tomasa86c6182006-10-11 01:21:03 -07001649}
1650
1651/*
Randy Dunlapd0d856e2006-10-11 01:21:07 -07001652 * ext4_ext_correct_indexes:
1653 * if leaf gets modified and modified extent is first in the leaf,
1654 * then we have to correct all indexes above.
Alex Tomasa86c6182006-10-11 01:21:03 -07001655 * TODO: do we need to correct tree in all cases?
1656 */
Aneesh Kumar K.V1d03ec92008-01-28 23:58:27 -05001657static int ext4_ext_correct_indexes(handle_t *handle, struct inode *inode,
Alex Tomasa86c6182006-10-11 01:21:03 -07001658 struct ext4_ext_path *path)
1659{
1660 struct ext4_extent_header *eh;
1661 int depth = ext_depth(inode);
1662 struct ext4_extent *ex;
1663 __le32 border;
1664 int k, err = 0;
1665
1666 eh = path[depth].p_hdr;
1667 ex = path[depth].p_ext;
Frank Mayhar273df552010-03-02 11:46:09 -05001668
1669 if (unlikely(ex == NULL || eh == NULL)) {
1670 EXT4_ERROR_INODE(inode,
1671 "ex %p == NULL or eh %p == NULL", ex, eh);
1672 return -EIO;
1673 }
Alex Tomasa86c6182006-10-11 01:21:03 -07001674
1675 if (depth == 0) {
1676 /* there is no tree at all */
1677 return 0;
1678 }
1679
1680 if (ex != EXT_FIRST_EXTENT(eh)) {
1681 /* we correct tree if first leaf got modified only */
1682 return 0;
1683 }
1684
1685 /*
Randy Dunlapd0d856e2006-10-11 01:21:07 -07001686 * TODO: we need correction if border is smaller than current one
Alex Tomasa86c6182006-10-11 01:21:03 -07001687 */
1688 k = depth - 1;
1689 border = path[depth].p_ext->ee_block;
Avantika Mathur7e028972006-12-06 20:41:33 -08001690 err = ext4_ext_get_access(handle, inode, path + k);
1691 if (err)
Alex Tomasa86c6182006-10-11 01:21:03 -07001692 return err;
1693 path[k].p_idx->ei_block = border;
Avantika Mathur7e028972006-12-06 20:41:33 -08001694 err = ext4_ext_dirty(handle, inode, path + k);
1695 if (err)
Alex Tomasa86c6182006-10-11 01:21:03 -07001696 return err;
1697
1698 while (k--) {
1699 /* change all left-side indexes */
1700 if (path[k+1].p_idx != EXT_FIRST_INDEX(path[k+1].p_hdr))
1701 break;
Avantika Mathur7e028972006-12-06 20:41:33 -08001702 err = ext4_ext_get_access(handle, inode, path + k);
1703 if (err)
Alex Tomasa86c6182006-10-11 01:21:03 -07001704 break;
1705 path[k].p_idx->ei_block = border;
Avantika Mathur7e028972006-12-06 20:41:33 -08001706 err = ext4_ext_dirty(handle, inode, path + k);
1707 if (err)
Alex Tomasa86c6182006-10-11 01:21:03 -07001708 break;
1709 }
1710
1711 return err;
1712}
1713
Akira Fujita748de672009-06-17 19:24:03 -04001714int
Alex Tomasa86c6182006-10-11 01:21:03 -07001715ext4_can_extents_be_merged(struct inode *inode, struct ext4_extent *ex1,
1716 struct ext4_extent *ex2)
1717{
Eric Sandeenda0169b2013-11-04 09:58:26 -05001718 unsigned short ext1_ee_len, ext2_ee_len;
Amit Aroraa2df2a62007-07-17 21:42:41 -04001719
1720 /*
Dmitry Monakhovec22ba82013-03-04 00:36:06 -05001721 * Make sure that both extents are initialized. We don't merge
Lukas Czerner556615d2014-04-20 23:45:47 -04001722 * unwritten extents so that we can be sure that end_io code has
Dmitry Monakhovec22ba82013-03-04 00:36:06 -05001723 * the extent that was written properly split out and conversion to
1724 * initialized is trivial.
Amit Aroraa2df2a62007-07-17 21:42:41 -04001725 */
Lukas Czerner556615d2014-04-20 23:45:47 -04001726 if (ext4_ext_is_unwritten(ex1) != ext4_ext_is_unwritten(ex2))
Amit Aroraa2df2a62007-07-17 21:42:41 -04001727 return 0;
1728
1729 ext1_ee_len = ext4_ext_get_actual_len(ex1);
1730 ext2_ee_len = ext4_ext_get_actual_len(ex2);
1731
1732 if (le32_to_cpu(ex1->ee_block) + ext1_ee_len !=
Andrew Morton63f57932006-10-11 01:21:24 -07001733 le32_to_cpu(ex2->ee_block))
Alex Tomasa86c6182006-10-11 01:21:03 -07001734 return 0;
1735
Suparna Bhattacharya471d4012006-10-11 01:21:06 -07001736 /*
1737 * To allow future support for preallocated extents to be added
1738 * as an RO_COMPAT feature, refuse to merge to extents if
Randy Dunlapd0d856e2006-10-11 01:21:07 -07001739 * this can result in the top bit of ee_len being set.
Suparna Bhattacharya471d4012006-10-11 01:21:06 -07001740 */
Eric Sandeenda0169b2013-11-04 09:58:26 -05001741 if (ext1_ee_len + ext2_ee_len > EXT_INIT_MAX_LEN)
Suparna Bhattacharya471d4012006-10-11 01:21:06 -07001742 return 0;
Lukas Czerner556615d2014-04-20 23:45:47 -04001743 if (ext4_ext_is_unwritten(ex1) &&
Darrick J. Wonga9b82412014-02-20 21:17:35 -05001744 (ext4_test_inode_state(inode, EXT4_STATE_DIO_UNWRITTEN) ||
1745 atomic_read(&EXT4_I(inode)->i_unwritten) ||
Lukas Czerner556615d2014-04-20 23:45:47 -04001746 (ext1_ee_len + ext2_ee_len > EXT_UNWRITTEN_MAX_LEN)))
Darrick J. Wonga9b82412014-02-20 21:17:35 -05001747 return 0;
Robert P. J. Daybbf2f9f2007-02-17 19:20:16 +01001748#ifdef AGGRESSIVE_TEST
Aneesh Kumar K.Vb939e372008-01-28 23:58:27 -05001749 if (ext1_ee_len >= 4)
Alex Tomasa86c6182006-10-11 01:21:03 -07001750 return 0;
1751#endif
1752
Theodore Ts'obf89d162010-10-27 21:30:14 -04001753 if (ext4_ext_pblock(ex1) + ext1_ee_len == ext4_ext_pblock(ex2))
Alex Tomasa86c6182006-10-11 01:21:03 -07001754 return 1;
1755 return 0;
1756}
1757
1758/*
Amit Arora56055d32007-07-17 21:42:38 -04001759 * This function tries to merge the "ex" extent to the next extent in the tree.
1760 * It always tries to merge towards right. If you want to merge towards
1761 * left, pass "ex - 1" as argument instead of "ex".
1762 * Returns 0 if the extents (ex and ex+1) were _not_ merged and returns
1763 * 1 if they got merged.
1764 */
Yongqiang Yang197217a2011-05-03 11:45:29 -04001765static int ext4_ext_try_to_merge_right(struct inode *inode,
Theodore Ts'o1f109d52010-10-27 21:30:14 -04001766 struct ext4_ext_path *path,
1767 struct ext4_extent *ex)
Amit Arora56055d32007-07-17 21:42:38 -04001768{
1769 struct ext4_extent_header *eh;
1770 unsigned int depth, len;
Lukas Czerner556615d2014-04-20 23:45:47 -04001771 int merge_done = 0, unwritten;
Amit Arora56055d32007-07-17 21:42:38 -04001772
1773 depth = ext_depth(inode);
1774 BUG_ON(path[depth].p_hdr == NULL);
1775 eh = path[depth].p_hdr;
1776
1777 while (ex < EXT_LAST_EXTENT(eh)) {
1778 if (!ext4_can_extents_be_merged(inode, ex, ex + 1))
1779 break;
1780 /* merge with next extent! */
Lukas Czerner556615d2014-04-20 23:45:47 -04001781 unwritten = ext4_ext_is_unwritten(ex);
Amit Arora56055d32007-07-17 21:42:38 -04001782 ex->ee_len = cpu_to_le16(ext4_ext_get_actual_len(ex)
1783 + ext4_ext_get_actual_len(ex + 1));
Lukas Czerner556615d2014-04-20 23:45:47 -04001784 if (unwritten)
1785 ext4_ext_mark_unwritten(ex);
Amit Arora56055d32007-07-17 21:42:38 -04001786
1787 if (ex + 1 < EXT_LAST_EXTENT(eh)) {
1788 len = (EXT_LAST_EXTENT(eh) - ex - 1)
1789 * sizeof(struct ext4_extent);
1790 memmove(ex + 1, ex + 2, len);
1791 }
Marcin Slusarze8546d02008-04-17 10:38:59 -04001792 le16_add_cpu(&eh->eh_entries, -1);
Amit Arora56055d32007-07-17 21:42:38 -04001793 merge_done = 1;
1794 WARN_ON(eh->eh_entries == 0);
1795 if (!eh->eh_entries)
Theodore Ts'o24676da2010-05-16 21:00:00 -04001796 EXT4_ERROR_INODE(inode, "eh->eh_entries = 0!");
Amit Arora56055d32007-07-17 21:42:38 -04001797 }
1798
1799 return merge_done;
1800}
1801
1802/*
Theodore Ts'oecb94f52012-08-17 09:44:17 -04001803 * This function does a very simple check to see if we can collapse
1804 * an extent tree with a single extent tree leaf block into the inode.
1805 */
1806static void ext4_ext_try_to_merge_up(handle_t *handle,
1807 struct inode *inode,
1808 struct ext4_ext_path *path)
1809{
1810 size_t s;
1811 unsigned max_root = ext4_ext_space_root(inode, 0);
1812 ext4_fsblk_t blk;
1813
1814 if ((path[0].p_depth != 1) ||
1815 (le16_to_cpu(path[0].p_hdr->eh_entries) != 1) ||
1816 (le16_to_cpu(path[1].p_hdr->eh_entries) > max_root))
1817 return;
1818
1819 /*
1820 * We need to modify the block allocation bitmap and the block
1821 * group descriptor to release the extent tree block. If we
1822 * can't get the journal credits, give up.
1823 */
1824 if (ext4_journal_extend(handle, 2))
1825 return;
1826
1827 /*
1828 * Copy the extent data up to the inode
1829 */
1830 blk = ext4_idx_pblock(path[0].p_idx);
1831 s = le16_to_cpu(path[1].p_hdr->eh_entries) *
1832 sizeof(struct ext4_extent_idx);
1833 s += sizeof(struct ext4_extent_header);
1834
Theodore Ts'o10809df82014-09-01 14:40:09 -04001835 path[1].p_maxdepth = path[0].p_maxdepth;
Theodore Ts'oecb94f52012-08-17 09:44:17 -04001836 memcpy(path[0].p_hdr, path[1].p_hdr, s);
1837 path[0].p_depth = 0;
1838 path[0].p_ext = EXT_FIRST_EXTENT(path[0].p_hdr) +
1839 (path[1].p_ext - EXT_FIRST_EXTENT(path[1].p_hdr));
1840 path[0].p_hdr->eh_max = cpu_to_le16(max_root);
1841
1842 brelse(path[1].p_bh);
1843 ext4_free_blocks(handle, inode, NULL, blk, 1,
Theodore Ts'o71d4f7d2014-07-15 06:02:38 -04001844 EXT4_FREE_BLOCKS_METADATA | EXT4_FREE_BLOCKS_FORGET);
Theodore Ts'oecb94f52012-08-17 09:44:17 -04001845}
1846
1847/*
Yongqiang Yang197217a2011-05-03 11:45:29 -04001848 * This function tries to merge the @ex extent to neighbours in the tree.
1849 * return 1 if merge left else 0.
1850 */
Theodore Ts'oecb94f52012-08-17 09:44:17 -04001851static void ext4_ext_try_to_merge(handle_t *handle,
1852 struct inode *inode,
Yongqiang Yang197217a2011-05-03 11:45:29 -04001853 struct ext4_ext_path *path,
1854 struct ext4_extent *ex) {
1855 struct ext4_extent_header *eh;
1856 unsigned int depth;
1857 int merge_done = 0;
Yongqiang Yang197217a2011-05-03 11:45:29 -04001858
1859 depth = ext_depth(inode);
1860 BUG_ON(path[depth].p_hdr == NULL);
1861 eh = path[depth].p_hdr;
1862
1863 if (ex > EXT_FIRST_EXTENT(eh))
1864 merge_done = ext4_ext_try_to_merge_right(inode, path, ex - 1);
1865
1866 if (!merge_done)
Theodore Ts'oecb94f52012-08-17 09:44:17 -04001867 (void) ext4_ext_try_to_merge_right(inode, path, ex);
Yongqiang Yang197217a2011-05-03 11:45:29 -04001868
Theodore Ts'oecb94f52012-08-17 09:44:17 -04001869 ext4_ext_try_to_merge_up(handle, inode, path);
Yongqiang Yang197217a2011-05-03 11:45:29 -04001870}
1871
1872/*
Amit Arora25d14f92007-05-24 13:04:13 -04001873 * check if a portion of the "newext" extent overlaps with an
1874 * existing extent.
1875 *
1876 * If there is an overlap discovered, it updates the length of the newext
1877 * such that there will be no overlap, and then returns 1.
1878 * If there is no overlap found, it returns 0.
1879 */
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04001880static unsigned int ext4_ext_check_overlap(struct ext4_sb_info *sbi,
1881 struct inode *inode,
Theodore Ts'o1f109d52010-10-27 21:30:14 -04001882 struct ext4_extent *newext,
1883 struct ext4_ext_path *path)
Amit Arora25d14f92007-05-24 13:04:13 -04001884{
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05001885 ext4_lblk_t b1, b2;
Amit Arora25d14f92007-05-24 13:04:13 -04001886 unsigned int depth, len1;
1887 unsigned int ret = 0;
1888
1889 b1 = le32_to_cpu(newext->ee_block);
Amit Aroraa2df2a62007-07-17 21:42:41 -04001890 len1 = ext4_ext_get_actual_len(newext);
Amit Arora25d14f92007-05-24 13:04:13 -04001891 depth = ext_depth(inode);
1892 if (!path[depth].p_ext)
1893 goto out;
Theodore Ts'of5a44db2013-12-20 09:29:35 -05001894 b2 = EXT4_LBLK_CMASK(sbi, le32_to_cpu(path[depth].p_ext->ee_block));
Amit Arora25d14f92007-05-24 13:04:13 -04001895
1896 /*
1897 * get the next allocated block if the extent in the path
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001898 * is before the requested block(s)
Amit Arora25d14f92007-05-24 13:04:13 -04001899 */
1900 if (b2 < b1) {
1901 b2 = ext4_ext_next_allocated_block(path);
Lukas Czernerf17722f2011-06-06 00:05:17 -04001902 if (b2 == EXT_MAX_BLOCKS)
Amit Arora25d14f92007-05-24 13:04:13 -04001903 goto out;
Theodore Ts'of5a44db2013-12-20 09:29:35 -05001904 b2 = EXT4_LBLK_CMASK(sbi, b2);
Amit Arora25d14f92007-05-24 13:04:13 -04001905 }
1906
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05001907 /* check for wrap through zero on extent logical start block*/
Amit Arora25d14f92007-05-24 13:04:13 -04001908 if (b1 + len1 < b1) {
Lukas Czernerf17722f2011-06-06 00:05:17 -04001909 len1 = EXT_MAX_BLOCKS - b1;
Amit Arora25d14f92007-05-24 13:04:13 -04001910 newext->ee_len = cpu_to_le16(len1);
1911 ret = 1;
1912 }
1913
1914 /* check for overlap */
1915 if (b1 + len1 > b2) {
1916 newext->ee_len = cpu_to_le16(b2 - b1);
1917 ret = 1;
1918 }
1919out:
1920 return ret;
1921}
1922
1923/*
Randy Dunlapd0d856e2006-10-11 01:21:07 -07001924 * ext4_ext_insert_extent:
1925 * tries to merge requsted extent into the existing extent or
1926 * inserts requested extent as new one into the tree,
1927 * creating new leaf in the no-space case.
Alex Tomasa86c6182006-10-11 01:21:03 -07001928 */
1929int ext4_ext_insert_extent(handle_t *handle, struct inode *inode,
Theodore Ts'odfe50802014-09-01 14:37:09 -04001930 struct ext4_ext_path **ppath,
Theodore Ts'o107a7bd2013-08-16 21:23:41 -04001931 struct ext4_extent *newext, int gb_flags)
Alex Tomasa86c6182006-10-11 01:21:03 -07001932{
Theodore Ts'odfe50802014-09-01 14:37:09 -04001933 struct ext4_ext_path *path = *ppath;
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001934 struct ext4_extent_header *eh;
Alex Tomasa86c6182006-10-11 01:21:03 -07001935 struct ext4_extent *ex, *fex;
1936 struct ext4_extent *nearex; /* nearest extent */
1937 struct ext4_ext_path *npath = NULL;
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05001938 int depth, len, err;
1939 ext4_lblk_t next;
Lukas Czerner556615d2014-04-20 23:45:47 -04001940 int mb_flags = 0, unwritten;
Alex Tomasa86c6182006-10-11 01:21:03 -07001941
Theodore Ts'oe3cf5d52014-09-04 18:07:25 -04001942 if (gb_flags & EXT4_GET_BLOCKS_DELALLOC_RESERVE)
1943 mb_flags |= EXT4_MB_DELALLOC_RESERVED;
Frank Mayhar273df552010-03-02 11:46:09 -05001944 if (unlikely(ext4_ext_get_actual_len(newext) == 0)) {
1945 EXT4_ERROR_INODE(inode, "ext4_ext_get_actual_len(newext) == 0");
1946 return -EIO;
1947 }
Alex Tomasa86c6182006-10-11 01:21:03 -07001948 depth = ext_depth(inode);
1949 ex = path[depth].p_ext;
Lukas Czernerbe8981b2013-04-03 23:33:28 -04001950 eh = path[depth].p_hdr;
Frank Mayhar273df552010-03-02 11:46:09 -05001951 if (unlikely(path[depth].p_hdr == NULL)) {
1952 EXT4_ERROR_INODE(inode, "path[%d].p_hdr == NULL", depth);
1953 return -EIO;
1954 }
Alex Tomasa86c6182006-10-11 01:21:03 -07001955
1956 /* try to insert block into found extent and return */
Theodore Ts'o107a7bd2013-08-16 21:23:41 -04001957 if (ex && !(gb_flags & EXT4_GET_BLOCKS_PRE_IO)) {
Amit Aroraa2df2a62007-07-17 21:42:41 -04001958
1959 /*
Lukas Czernerbe8981b2013-04-03 23:33:28 -04001960 * Try to see whether we should rather test the extent on
1961 * right from ex, or from the left of ex. This is because
Theodore Ts'oed8a1a72014-09-01 14:43:09 -04001962 * ext4_find_extent() can return either extent on the
Lukas Czernerbe8981b2013-04-03 23:33:28 -04001963 * left, or on the right from the searched position. This
1964 * will make merging more effective.
Amit Aroraa2df2a62007-07-17 21:42:41 -04001965 */
Lukas Czernerbe8981b2013-04-03 23:33:28 -04001966 if (ex < EXT_LAST_EXTENT(eh) &&
1967 (le32_to_cpu(ex->ee_block) +
1968 ext4_ext_get_actual_len(ex) <
1969 le32_to_cpu(newext->ee_block))) {
1970 ex += 1;
1971 goto prepend;
1972 } else if ((ex > EXT_FIRST_EXTENT(eh)) &&
1973 (le32_to_cpu(newext->ee_block) +
1974 ext4_ext_get_actual_len(newext) <
1975 le32_to_cpu(ex->ee_block)))
1976 ex -= 1;
1977
1978 /* Try to append newex to the ex */
1979 if (ext4_can_extents_be_merged(inode, ex, newext)) {
1980 ext_debug("append [%d]%d block to %u:[%d]%d"
1981 "(from %llu)\n",
Lukas Czerner556615d2014-04-20 23:45:47 -04001982 ext4_ext_is_unwritten(newext),
Lukas Czernerbe8981b2013-04-03 23:33:28 -04001983 ext4_ext_get_actual_len(newext),
1984 le32_to_cpu(ex->ee_block),
Lukas Czerner556615d2014-04-20 23:45:47 -04001985 ext4_ext_is_unwritten(ex),
Lukas Czernerbe8981b2013-04-03 23:33:28 -04001986 ext4_ext_get_actual_len(ex),
1987 ext4_ext_pblock(ex));
1988 err = ext4_ext_get_access(handle, inode,
1989 path + depth);
1990 if (err)
1991 return err;
Lukas Czerner556615d2014-04-20 23:45:47 -04001992 unwritten = ext4_ext_is_unwritten(ex);
Lukas Czernerbe8981b2013-04-03 23:33:28 -04001993 ex->ee_len = cpu_to_le16(ext4_ext_get_actual_len(ex)
Amit Aroraa2df2a62007-07-17 21:42:41 -04001994 + ext4_ext_get_actual_len(newext));
Lukas Czerner556615d2014-04-20 23:45:47 -04001995 if (unwritten)
1996 ext4_ext_mark_unwritten(ex);
Lukas Czernerbe8981b2013-04-03 23:33:28 -04001997 eh = path[depth].p_hdr;
1998 nearex = ex;
1999 goto merge;
2000 }
2001
2002prepend:
2003 /* Try to prepend newex to the ex */
2004 if (ext4_can_extents_be_merged(inode, newext, ex)) {
2005 ext_debug("prepend %u[%d]%d block to %u:[%d]%d"
2006 "(from %llu)\n",
2007 le32_to_cpu(newext->ee_block),
Lukas Czerner556615d2014-04-20 23:45:47 -04002008 ext4_ext_is_unwritten(newext),
Lukas Czernerbe8981b2013-04-03 23:33:28 -04002009 ext4_ext_get_actual_len(newext),
2010 le32_to_cpu(ex->ee_block),
Lukas Czerner556615d2014-04-20 23:45:47 -04002011 ext4_ext_is_unwritten(ex),
Lukas Czernerbe8981b2013-04-03 23:33:28 -04002012 ext4_ext_get_actual_len(ex),
2013 ext4_ext_pblock(ex));
2014 err = ext4_ext_get_access(handle, inode,
2015 path + depth);
2016 if (err)
2017 return err;
2018
Lukas Czerner556615d2014-04-20 23:45:47 -04002019 unwritten = ext4_ext_is_unwritten(ex);
Lukas Czernerbe8981b2013-04-03 23:33:28 -04002020 ex->ee_block = newext->ee_block;
2021 ext4_ext_store_pblock(ex, ext4_ext_pblock(newext));
2022 ex->ee_len = cpu_to_le16(ext4_ext_get_actual_len(ex)
2023 + ext4_ext_get_actual_len(newext));
Lukas Czerner556615d2014-04-20 23:45:47 -04002024 if (unwritten)
2025 ext4_ext_mark_unwritten(ex);
Lukas Czernerbe8981b2013-04-03 23:33:28 -04002026 eh = path[depth].p_hdr;
2027 nearex = ex;
2028 goto merge;
2029 }
Alex Tomasa86c6182006-10-11 01:21:03 -07002030 }
2031
Alex Tomasa86c6182006-10-11 01:21:03 -07002032 depth = ext_depth(inode);
2033 eh = path[depth].p_hdr;
2034 if (le16_to_cpu(eh->eh_entries) < le16_to_cpu(eh->eh_max))
2035 goto has_space;
2036
2037 /* probably next leaf has space for us? */
2038 fex = EXT_LAST_EXTENT(eh);
Robin Dong598dbdf2011-07-11 18:24:01 -04002039 next = EXT_MAX_BLOCKS;
2040 if (le32_to_cpu(newext->ee_block) > le32_to_cpu(fex->ee_block))
Robin Dong57187892011-07-23 21:49:07 -04002041 next = ext4_ext_next_leaf_block(path);
Robin Dong598dbdf2011-07-11 18:24:01 -04002042 if (next != EXT_MAX_BLOCKS) {
Yongqiang Yang32de6752011-11-01 18:56:41 -04002043 ext_debug("next leaf block - %u\n", next);
Alex Tomasa86c6182006-10-11 01:21:03 -07002044 BUG_ON(npath != NULL);
Theodore Ts'oed8a1a72014-09-01 14:43:09 -04002045 npath = ext4_find_extent(inode, next, NULL, 0);
Alex Tomasa86c6182006-10-11 01:21:03 -07002046 if (IS_ERR(npath))
2047 return PTR_ERR(npath);
2048 BUG_ON(npath->p_depth != path->p_depth);
2049 eh = npath[depth].p_hdr;
2050 if (le16_to_cpu(eh->eh_entries) < le16_to_cpu(eh->eh_max)) {
Lucas De Marchi25985ed2011-03-30 22:57:33 -03002051 ext_debug("next leaf isn't full(%d)\n",
Alex Tomasa86c6182006-10-11 01:21:03 -07002052 le16_to_cpu(eh->eh_entries));
2053 path = npath;
Robin Dongffb505f2011-07-11 11:43:59 -04002054 goto has_space;
Alex Tomasa86c6182006-10-11 01:21:03 -07002055 }
2056 ext_debug("next leaf has no free space(%d,%d)\n",
2057 le16_to_cpu(eh->eh_entries), le16_to_cpu(eh->eh_max));
2058 }
2059
2060 /*
Randy Dunlapd0d856e2006-10-11 01:21:07 -07002061 * There is no free space in the found leaf.
2062 * We're gonna add a new leaf in the tree.
Alex Tomasa86c6182006-10-11 01:21:03 -07002063 */
Theodore Ts'o107a7bd2013-08-16 21:23:41 -04002064 if (gb_flags & EXT4_GET_BLOCKS_METADATA_NOFAIL)
Theodore Ts'oe3cf5d52014-09-04 18:07:25 -04002065 mb_flags |= EXT4_MB_USE_RESERVED;
Theodore Ts'o107a7bd2013-08-16 21:23:41 -04002066 err = ext4_ext_create_new_leaf(handle, inode, mb_flags, gb_flags,
Theodore Ts'odfe50802014-09-01 14:37:09 -04002067 ppath, newext);
Alex Tomasa86c6182006-10-11 01:21:03 -07002068 if (err)
2069 goto cleanup;
2070 depth = ext_depth(inode);
2071 eh = path[depth].p_hdr;
2072
2073has_space:
2074 nearex = path[depth].p_ext;
2075
Avantika Mathur7e028972006-12-06 20:41:33 -08002076 err = ext4_ext_get_access(handle, inode, path + depth);
2077 if (err)
Alex Tomasa86c6182006-10-11 01:21:03 -07002078 goto cleanup;
2079
2080 if (!nearex) {
2081 /* there is no extent in this leaf, create first one */
Yongqiang Yang32de6752011-11-01 18:56:41 -04002082 ext_debug("first extent in the leaf: %u:%llu:[%d]%d\n",
Dave Kleikamp8c55e202007-05-24 13:04:54 -04002083 le32_to_cpu(newext->ee_block),
Theodore Ts'obf89d162010-10-27 21:30:14 -04002084 ext4_ext_pblock(newext),
Lukas Czerner556615d2014-04-20 23:45:47 -04002085 ext4_ext_is_unwritten(newext),
Amit Aroraa2df2a62007-07-17 21:42:41 -04002086 ext4_ext_get_actual_len(newext));
Eric Gouriou80e675f2011-10-27 11:52:18 -04002087 nearex = EXT_FIRST_EXTENT(eh);
2088 } else {
2089 if (le32_to_cpu(newext->ee_block)
Dave Kleikamp8c55e202007-05-24 13:04:54 -04002090 > le32_to_cpu(nearex->ee_block)) {
Eric Gouriou80e675f2011-10-27 11:52:18 -04002091 /* Insert after */
Yongqiang Yang32de6752011-11-01 18:56:41 -04002092 ext_debug("insert %u:%llu:[%d]%d before: "
2093 "nearest %p\n",
Dave Kleikamp8c55e202007-05-24 13:04:54 -04002094 le32_to_cpu(newext->ee_block),
Theodore Ts'obf89d162010-10-27 21:30:14 -04002095 ext4_ext_pblock(newext),
Lukas Czerner556615d2014-04-20 23:45:47 -04002096 ext4_ext_is_unwritten(newext),
Amit Aroraa2df2a62007-07-17 21:42:41 -04002097 ext4_ext_get_actual_len(newext),
Eric Gouriou80e675f2011-10-27 11:52:18 -04002098 nearex);
2099 nearex++;
2100 } else {
2101 /* Insert before */
2102 BUG_ON(newext->ee_block == nearex->ee_block);
Yongqiang Yang32de6752011-11-01 18:56:41 -04002103 ext_debug("insert %u:%llu:[%d]%d after: "
2104 "nearest %p\n",
Eric Gouriou80e675f2011-10-27 11:52:18 -04002105 le32_to_cpu(newext->ee_block),
2106 ext4_ext_pblock(newext),
Lukas Czerner556615d2014-04-20 23:45:47 -04002107 ext4_ext_is_unwritten(newext),
Eric Gouriou80e675f2011-10-27 11:52:18 -04002108 ext4_ext_get_actual_len(newext),
2109 nearex);
Alex Tomasa86c6182006-10-11 01:21:03 -07002110 }
Eric Gouriou80e675f2011-10-27 11:52:18 -04002111 len = EXT_LAST_EXTENT(eh) - nearex + 1;
2112 if (len > 0) {
Yongqiang Yang32de6752011-11-01 18:56:41 -04002113 ext_debug("insert %u:%llu:[%d]%d: "
Eric Gouriou80e675f2011-10-27 11:52:18 -04002114 "move %d extents from 0x%p to 0x%p\n",
2115 le32_to_cpu(newext->ee_block),
2116 ext4_ext_pblock(newext),
Lukas Czerner556615d2014-04-20 23:45:47 -04002117 ext4_ext_is_unwritten(newext),
Eric Gouriou80e675f2011-10-27 11:52:18 -04002118 ext4_ext_get_actual_len(newext),
2119 len, nearex, nearex + 1);
2120 memmove(nearex + 1, nearex,
2121 len * sizeof(struct ext4_extent));
2122 }
Alex Tomasa86c6182006-10-11 01:21:03 -07002123 }
2124
Marcin Slusarze8546d02008-04-17 10:38:59 -04002125 le16_add_cpu(&eh->eh_entries, 1);
Eric Gouriou80e675f2011-10-27 11:52:18 -04002126 path[depth].p_ext = nearex;
Alex Tomasa86c6182006-10-11 01:21:03 -07002127 nearex->ee_block = newext->ee_block;
Theodore Ts'obf89d162010-10-27 21:30:14 -04002128 ext4_ext_store_pblock(nearex, ext4_ext_pblock(newext));
Alex Tomasa86c6182006-10-11 01:21:03 -07002129 nearex->ee_len = newext->ee_len;
Alex Tomasa86c6182006-10-11 01:21:03 -07002130
2131merge:
HaiboLiue7bcf822012-07-09 16:29:28 -04002132 /* try to merge extents */
Theodore Ts'o107a7bd2013-08-16 21:23:41 -04002133 if (!(gb_flags & EXT4_GET_BLOCKS_PRE_IO))
Theodore Ts'oecb94f52012-08-17 09:44:17 -04002134 ext4_ext_try_to_merge(handle, inode, path, nearex);
Alex Tomasa86c6182006-10-11 01:21:03 -07002135
Alex Tomasa86c6182006-10-11 01:21:03 -07002136
2137 /* time to correct all indexes above */
2138 err = ext4_ext_correct_indexes(handle, inode, path);
2139 if (err)
2140 goto cleanup;
2141
Theodore Ts'oecb94f52012-08-17 09:44:17 -04002142 err = ext4_ext_dirty(handle, inode, path + path->p_depth);
Alex Tomasa86c6182006-10-11 01:21:03 -07002143
2144cleanup:
Theodore Ts'ob7ea89a2014-09-01 14:39:09 -04002145 ext4_ext_drop_refs(npath);
2146 kfree(npath);
Alex Tomasa86c6182006-10-11 01:21:03 -07002147 return err;
2148}
2149
Lukas Czerner91dd8c12012-11-28 12:32:26 -05002150static int ext4_fill_fiemap_extents(struct inode *inode,
2151 ext4_lblk_t block, ext4_lblk_t num,
2152 struct fiemap_extent_info *fieinfo)
Eric Sandeen6873fa02008-10-07 00:46:36 -04002153{
2154 struct ext4_ext_path *path = NULL;
Eric Sandeen6873fa02008-10-07 00:46:36 -04002155 struct ext4_extent *ex;
Zheng Liu69eb33d2013-02-18 00:31:07 -05002156 struct extent_status es;
Lukas Czerner91dd8c12012-11-28 12:32:26 -05002157 ext4_lblk_t next, next_del, start = 0, end = 0;
Eric Sandeen6873fa02008-10-07 00:46:36 -04002158 ext4_lblk_t last = block + num;
Lukas Czerner91dd8c12012-11-28 12:32:26 -05002159 int exists, depth = 0, err = 0;
2160 unsigned int flags = 0;
2161 unsigned char blksize_bits = inode->i_sb->s_blocksize_bits;
Eric Sandeen6873fa02008-10-07 00:46:36 -04002162
Lukas Czernerf17722f2011-06-06 00:05:17 -04002163 while (block < last && block != EXT_MAX_BLOCKS) {
Eric Sandeen6873fa02008-10-07 00:46:36 -04002164 num = last - block;
2165 /* find extent for this block */
Theodore Ts'ofab3a542009-12-09 21:30:02 -05002166 down_read(&EXT4_I(inode)->i_data_sem);
Lukas Czerner91dd8c12012-11-28 12:32:26 -05002167
Theodore Ts'oed8a1a72014-09-01 14:43:09 -04002168 path = ext4_find_extent(inode, block, &path, 0);
Eric Sandeen6873fa02008-10-07 00:46:36 -04002169 if (IS_ERR(path)) {
Lukas Czerner91dd8c12012-11-28 12:32:26 -05002170 up_read(&EXT4_I(inode)->i_data_sem);
Eric Sandeen6873fa02008-10-07 00:46:36 -04002171 err = PTR_ERR(path);
2172 path = NULL;
2173 break;
2174 }
2175
2176 depth = ext_depth(inode);
Frank Mayhar273df552010-03-02 11:46:09 -05002177 if (unlikely(path[depth].p_hdr == NULL)) {
Lukas Czerner91dd8c12012-11-28 12:32:26 -05002178 up_read(&EXT4_I(inode)->i_data_sem);
Frank Mayhar273df552010-03-02 11:46:09 -05002179 EXT4_ERROR_INODE(inode, "path[%d].p_hdr == NULL", depth);
2180 err = -EIO;
2181 break;
2182 }
Eric Sandeen6873fa02008-10-07 00:46:36 -04002183 ex = path[depth].p_ext;
2184 next = ext4_ext_next_allocated_block(path);
2185
Lukas Czerner91dd8c12012-11-28 12:32:26 -05002186 flags = 0;
Eric Sandeen6873fa02008-10-07 00:46:36 -04002187 exists = 0;
2188 if (!ex) {
2189 /* there is no extent yet, so try to allocate
2190 * all requested space */
2191 start = block;
2192 end = block + num;
2193 } else if (le32_to_cpu(ex->ee_block) > block) {
2194 /* need to allocate space before found extent */
2195 start = block;
2196 end = le32_to_cpu(ex->ee_block);
2197 if (block + num < end)
2198 end = block + num;
2199 } else if (block >= le32_to_cpu(ex->ee_block)
2200 + ext4_ext_get_actual_len(ex)) {
2201 /* need to allocate space after found extent */
2202 start = block;
2203 end = block + num;
2204 if (end >= next)
2205 end = next;
2206 } else if (block >= le32_to_cpu(ex->ee_block)) {
2207 /*
2208 * some part of requested space is covered
2209 * by found extent
2210 */
2211 start = block;
2212 end = le32_to_cpu(ex->ee_block)
2213 + ext4_ext_get_actual_len(ex);
2214 if (block + num < end)
2215 end = block + num;
2216 exists = 1;
2217 } else {
2218 BUG();
2219 }
2220 BUG_ON(end <= start);
2221
2222 if (!exists) {
Zheng Liu69eb33d2013-02-18 00:31:07 -05002223 es.es_lblk = start;
2224 es.es_len = end - start;
2225 es.es_pblk = 0;
Eric Sandeen6873fa02008-10-07 00:46:36 -04002226 } else {
Zheng Liu69eb33d2013-02-18 00:31:07 -05002227 es.es_lblk = le32_to_cpu(ex->ee_block);
2228 es.es_len = ext4_ext_get_actual_len(ex);
2229 es.es_pblk = ext4_ext_pblock(ex);
Lukas Czerner556615d2014-04-20 23:45:47 -04002230 if (ext4_ext_is_unwritten(ex))
Lukas Czerner91dd8c12012-11-28 12:32:26 -05002231 flags |= FIEMAP_EXTENT_UNWRITTEN;
Eric Sandeen6873fa02008-10-07 00:46:36 -04002232 }
2233
Lukas Czerner91dd8c12012-11-28 12:32:26 -05002234 /*
Zheng Liu69eb33d2013-02-18 00:31:07 -05002235 * Find delayed extent and update es accordingly. We call
2236 * it even in !exists case to find out whether es is the
Lukas Czerner91dd8c12012-11-28 12:32:26 -05002237 * last existing extent or not.
2238 */
Zheng Liu69eb33d2013-02-18 00:31:07 -05002239 next_del = ext4_find_delayed_extent(inode, &es);
Lukas Czerner91dd8c12012-11-28 12:32:26 -05002240 if (!exists && next_del) {
2241 exists = 1;
Jie Liu72dac952013-06-12 23:13:59 -04002242 flags |= (FIEMAP_EXTENT_DELALLOC |
2243 FIEMAP_EXTENT_UNKNOWN);
Lukas Czerner91dd8c12012-11-28 12:32:26 -05002244 }
2245 up_read(&EXT4_I(inode)->i_data_sem);
2246
Zheng Liu69eb33d2013-02-18 00:31:07 -05002247 if (unlikely(es.es_len == 0)) {
2248 EXT4_ERROR_INODE(inode, "es.es_len == 0");
Frank Mayhar273df552010-03-02 11:46:09 -05002249 err = -EIO;
2250 break;
2251 }
Eric Sandeen6873fa02008-10-07 00:46:36 -04002252
Zheng Liuf7fec032013-02-18 00:28:47 -05002253 /*
2254 * This is possible iff next == next_del == EXT_MAX_BLOCKS.
2255 * we need to check next == EXT_MAX_BLOCKS because it is
2256 * possible that an extent is with unwritten and delayed
2257 * status due to when an extent is delayed allocated and
2258 * is allocated by fallocate status tree will track both of
2259 * them in a extent.
2260 *
2261 * So we could return a unwritten and delayed extent, and
2262 * its block is equal to 'next'.
2263 */
2264 if (next == next_del && next == EXT_MAX_BLOCKS) {
Lukas Czerner91dd8c12012-11-28 12:32:26 -05002265 flags |= FIEMAP_EXTENT_LAST;
2266 if (unlikely(next_del != EXT_MAX_BLOCKS ||
2267 next != EXT_MAX_BLOCKS)) {
2268 EXT4_ERROR_INODE(inode,
2269 "next extent == %u, next "
2270 "delalloc extent = %u",
2271 next, next_del);
2272 err = -EIO;
2273 break;
2274 }
Eric Sandeen6873fa02008-10-07 00:46:36 -04002275 }
2276
Lukas Czerner91dd8c12012-11-28 12:32:26 -05002277 if (exists) {
2278 err = fiemap_fill_next_extent(fieinfo,
Zheng Liu69eb33d2013-02-18 00:31:07 -05002279 (__u64)es.es_lblk << blksize_bits,
2280 (__u64)es.es_pblk << blksize_bits,
2281 (__u64)es.es_len << blksize_bits,
Lukas Czerner91dd8c12012-11-28 12:32:26 -05002282 flags);
2283 if (err < 0)
2284 break;
2285 if (err == 1) {
2286 err = 0;
2287 break;
2288 }
Eric Sandeen6873fa02008-10-07 00:46:36 -04002289 }
2290
Zheng Liu69eb33d2013-02-18 00:31:07 -05002291 block = es.es_lblk + es.es_len;
Eric Sandeen6873fa02008-10-07 00:46:36 -04002292 }
2293
Theodore Ts'ob7ea89a2014-09-01 14:39:09 -04002294 ext4_ext_drop_refs(path);
2295 kfree(path);
Eric Sandeen6873fa02008-10-07 00:46:36 -04002296 return err;
2297}
2298
Alex Tomasa86c6182006-10-11 01:21:03 -07002299/*
Randy Dunlapd0d856e2006-10-11 01:21:07 -07002300 * ext4_ext_put_gap_in_cache:
2301 * calculate boundaries of the gap that the requested block fits into
Alex Tomasa86c6182006-10-11 01:21:03 -07002302 * and cache this gap
2303 */
Avantika Mathur09b88252006-12-06 20:41:36 -08002304static void
Alex Tomasa86c6182006-10-11 01:21:03 -07002305ext4_ext_put_gap_in_cache(struct inode *inode, struct ext4_ext_path *path,
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05002306 ext4_lblk_t block)
Alex Tomasa86c6182006-10-11 01:21:03 -07002307{
2308 int depth = ext_depth(inode);
Zheng Liu2f8e0a72014-11-25 11:44:37 -05002309 ext4_lblk_t len;
2310 ext4_lblk_t lblock;
Alex Tomasa86c6182006-10-11 01:21:03 -07002311 struct ext4_extent *ex;
Zheng Liu2f8e0a72014-11-25 11:44:37 -05002312 struct extent_status es;
Alex Tomasa86c6182006-10-11 01:21:03 -07002313
2314 ex = path[depth].p_ext;
2315 if (ex == NULL) {
Zheng Liu2f8e0a72014-11-25 11:44:37 -05002316 /* there is no extent yet, so gap is [0;-] */
2317 lblock = 0;
2318 len = EXT_MAX_BLOCKS;
Alex Tomasa86c6182006-10-11 01:21:03 -07002319 ext_debug("cache gap(whole file):");
2320 } else if (block < le32_to_cpu(ex->ee_block)) {
2321 lblock = block;
2322 len = le32_to_cpu(ex->ee_block) - block;
Eric Sandeenbba90742008-01-28 23:58:27 -05002323 ext_debug("cache gap(before): %u [%u:%u]",
2324 block,
2325 le32_to_cpu(ex->ee_block),
2326 ext4_ext_get_actual_len(ex));
Alex Tomasa86c6182006-10-11 01:21:03 -07002327 } else if (block >= le32_to_cpu(ex->ee_block)
Amit Aroraa2df2a62007-07-17 21:42:41 -04002328 + ext4_ext_get_actual_len(ex)) {
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05002329 ext4_lblk_t next;
Dave Kleikamp8c55e202007-05-24 13:04:54 -04002330 lblock = le32_to_cpu(ex->ee_block)
Amit Aroraa2df2a62007-07-17 21:42:41 -04002331 + ext4_ext_get_actual_len(ex);
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05002332
2333 next = ext4_ext_next_allocated_block(path);
Eric Sandeenbba90742008-01-28 23:58:27 -05002334 ext_debug("cache gap(after): [%u:%u] %u",
2335 le32_to_cpu(ex->ee_block),
2336 ext4_ext_get_actual_len(ex),
2337 block);
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05002338 BUG_ON(next == lblock);
2339 len = next - lblock;
Alex Tomasa86c6182006-10-11 01:21:03 -07002340 } else {
Alex Tomasa86c6182006-10-11 01:21:03 -07002341 BUG();
2342 }
2343
Zheng Liu2f8e0a72014-11-25 11:44:37 -05002344 ext4_es_find_delayed_extent_range(inode, lblock, lblock + len - 1, &es);
2345 if (es.es_len) {
2346 /* There's delayed extent containing lblock? */
2347 if (es.es_lblk <= lblock)
2348 return;
2349 len = min(es.es_lblk - lblock, len);
2350 }
2351 ext_debug(" -> %u:%u\n", lblock, len);
2352 ext4_es_insert_extent(inode, lblock, len, ~0, EXTENT_STATUS_HOLE);
Alex Tomasa86c6182006-10-11 01:21:03 -07002353}
2354
2355/*
Randy Dunlapd0d856e2006-10-11 01:21:07 -07002356 * ext4_ext_rm_idx:
2357 * removes index from the index block.
Alex Tomasa86c6182006-10-11 01:21:03 -07002358 */
Aneesh Kumar K.V1d03ec92008-01-28 23:58:27 -05002359static int ext4_ext_rm_idx(handle_t *handle, struct inode *inode,
Forrest Liuc36575e2012-12-17 09:55:39 -05002360 struct ext4_ext_path *path, int depth)
Alex Tomasa86c6182006-10-11 01:21:03 -07002361{
Alex Tomasa86c6182006-10-11 01:21:03 -07002362 int err;
Alex Tomasf65e6fb2006-10-11 01:21:05 -07002363 ext4_fsblk_t leaf;
Alex Tomasa86c6182006-10-11 01:21:03 -07002364
2365 /* free index block */
Forrest Liuc36575e2012-12-17 09:55:39 -05002366 depth--;
2367 path = path + depth;
Theodore Ts'obf89d162010-10-27 21:30:14 -04002368 leaf = ext4_idx_pblock(path->p_idx);
Frank Mayhar273df552010-03-02 11:46:09 -05002369 if (unlikely(path->p_hdr->eh_entries == 0)) {
2370 EXT4_ERROR_INODE(inode, "path->p_hdr->eh_entries == 0");
2371 return -EIO;
2372 }
Avantika Mathur7e028972006-12-06 20:41:33 -08002373 err = ext4_ext_get_access(handle, inode, path);
2374 if (err)
Alex Tomasa86c6182006-10-11 01:21:03 -07002375 return err;
Robin Dong0e1147b2011-07-27 21:29:33 -04002376
2377 if (path->p_idx != EXT_LAST_INDEX(path->p_hdr)) {
2378 int len = EXT_LAST_INDEX(path->p_hdr) - path->p_idx;
2379 len *= sizeof(struct ext4_extent_idx);
2380 memmove(path->p_idx, path->p_idx + 1, len);
2381 }
2382
Marcin Slusarze8546d02008-04-17 10:38:59 -04002383 le16_add_cpu(&path->p_hdr->eh_entries, -1);
Avantika Mathur7e028972006-12-06 20:41:33 -08002384 err = ext4_ext_dirty(handle, inode, path);
2385 if (err)
Alex Tomasa86c6182006-10-11 01:21:03 -07002386 return err;
Mingming Cao2ae02102006-10-11 01:21:11 -07002387 ext_debug("index is empty, remove it, free block %llu\n", leaf);
Aditya Kalid8990242011-09-09 19:18:51 -04002388 trace_ext4_ext_rm_idx(inode, leaf);
2389
Peter Huewe7dc57612011-02-21 21:01:42 -05002390 ext4_free_blocks(handle, inode, NULL, leaf, 1,
Theodore Ts'oe6362602009-11-23 07:17:05 -05002391 EXT4_FREE_BLOCKS_METADATA | EXT4_FREE_BLOCKS_FORGET);
Forrest Liuc36575e2012-12-17 09:55:39 -05002392
2393 while (--depth >= 0) {
2394 if (path->p_idx != EXT_FIRST_INDEX(path->p_hdr))
2395 break;
2396 path--;
2397 err = ext4_ext_get_access(handle, inode, path);
2398 if (err)
2399 break;
2400 path->p_idx->ei_block = (path+1)->p_idx->ei_block;
2401 err = ext4_ext_dirty(handle, inode, path);
2402 if (err)
2403 break;
2404 }
Alex Tomasa86c6182006-10-11 01:21:03 -07002405 return err;
2406}
2407
2408/*
Mingming Caoee12b632008-08-19 22:16:05 -04002409 * ext4_ext_calc_credits_for_single_extent:
2410 * This routine returns max. credits that needed to insert an extent
2411 * to the extent tree.
2412 * When pass the actual path, the caller should calculate credits
2413 * under i_data_sem.
Alex Tomasa86c6182006-10-11 01:21:03 -07002414 */
Mingming Cao525f4ed2008-08-19 22:15:58 -04002415int ext4_ext_calc_credits_for_single_extent(struct inode *inode, int nrblocks,
Alex Tomasa86c6182006-10-11 01:21:03 -07002416 struct ext4_ext_path *path)
2417{
Alex Tomasa86c6182006-10-11 01:21:03 -07002418 if (path) {
Mingming Caoee12b632008-08-19 22:16:05 -04002419 int depth = ext_depth(inode);
Mingming Caof3bd1f32008-08-19 22:16:03 -04002420 int ret = 0;
Mingming Caoee12b632008-08-19 22:16:05 -04002421
Alex Tomasa86c6182006-10-11 01:21:03 -07002422 /* probably there is space in leaf? */
Alex Tomasa86c6182006-10-11 01:21:03 -07002423 if (le16_to_cpu(path[depth].p_hdr->eh_entries)
Mingming Caoee12b632008-08-19 22:16:05 -04002424 < le16_to_cpu(path[depth].p_hdr->eh_max)) {
2425
2426 /*
2427 * There are some space in the leaf tree, no
2428 * need to account for leaf block credit
2429 *
2430 * bitmaps and block group descriptor blocks
Tao Madf3ab172011-10-08 15:53:49 -04002431 * and other metadata blocks still need to be
Mingming Caoee12b632008-08-19 22:16:05 -04002432 * accounted.
2433 */
Mingming Cao525f4ed2008-08-19 22:15:58 -04002434 /* 1 bitmap, 1 block group descriptor */
Mingming Caoee12b632008-08-19 22:16:05 -04002435 ret = 2 + EXT4_META_TRANS_BLOCKS(inode->i_sb);
Aneesh Kumar K.V5887e982009-07-05 23:12:04 -04002436 return ret;
Mingming Caoee12b632008-08-19 22:16:05 -04002437 }
Alex Tomasa86c6182006-10-11 01:21:03 -07002438 }
2439
Mingming Cao525f4ed2008-08-19 22:15:58 -04002440 return ext4_chunk_trans_blocks(inode, nrblocks);
Mingming Caoee12b632008-08-19 22:16:05 -04002441}
Alex Tomasa86c6182006-10-11 01:21:03 -07002442
Mingming Caoee12b632008-08-19 22:16:05 -04002443/*
Jan Karafffb2732013-06-04 13:01:11 -04002444 * How many index/leaf blocks need to change/allocate to add @extents extents?
Mingming Caoee12b632008-08-19 22:16:05 -04002445 *
Jan Karafffb2732013-06-04 13:01:11 -04002446 * If we add a single extent, then in the worse case, each tree level
2447 * index/leaf need to be changed in case of the tree split.
Mingming Caoee12b632008-08-19 22:16:05 -04002448 *
Jan Karafffb2732013-06-04 13:01:11 -04002449 * If more extents are inserted, they could cause the whole tree split more
2450 * than once, but this is really rare.
Mingming Caoee12b632008-08-19 22:16:05 -04002451 */
Jan Karafffb2732013-06-04 13:01:11 -04002452int ext4_ext_index_trans_blocks(struct inode *inode, int extents)
Mingming Caoee12b632008-08-19 22:16:05 -04002453{
2454 int index;
Tao Maf19d5872012-12-10 14:05:51 -05002455 int depth;
2456
2457 /* If we are converting the inline data, only one is needed here. */
2458 if (ext4_has_inline_data(inode))
2459 return 1;
2460
2461 depth = ext_depth(inode);
Alex Tomasa86c6182006-10-11 01:21:03 -07002462
Jan Karafffb2732013-06-04 13:01:11 -04002463 if (extents <= 1)
Mingming Caoee12b632008-08-19 22:16:05 -04002464 index = depth * 2;
2465 else
2466 index = depth * 3;
Alex Tomasa86c6182006-10-11 01:21:03 -07002467
Mingming Caoee12b632008-08-19 22:16:05 -04002468 return index;
Alex Tomasa86c6182006-10-11 01:21:03 -07002469}
2470
Theodore Ts'o981250c2013-06-12 11:48:29 -04002471static inline int get_default_free_blocks_flags(struct inode *inode)
2472{
2473 if (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode))
2474 return EXT4_FREE_BLOCKS_METADATA | EXT4_FREE_BLOCKS_FORGET;
2475 else if (ext4_should_journal_data(inode))
2476 return EXT4_FREE_BLOCKS_FORGET;
2477 return 0;
2478}
2479
Alex Tomasa86c6182006-10-11 01:21:03 -07002480static int ext4_remove_blocks(handle_t *handle, struct inode *inode,
Theodore Ts'o0aa06002011-09-09 18:54:51 -04002481 struct ext4_extent *ex,
Lukas Czernerd23142c2013-05-27 23:33:35 -04002482 long long *partial_cluster,
Theodore Ts'o0aa06002011-09-09 18:54:51 -04002483 ext4_lblk_t from, ext4_lblk_t to)
Alex Tomasa86c6182006-10-11 01:21:03 -07002484{
Theodore Ts'o0aa06002011-09-09 18:54:51 -04002485 struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
Eric Whitney345ee942014-11-23 00:59:39 -05002486 unsigned short ee_len = ext4_ext_get_actual_len(ex);
Theodore Ts'o0aa06002011-09-09 18:54:51 -04002487 ext4_fsblk_t pblk;
Theodore Ts'o981250c2013-06-12 11:48:29 -04002488 int flags = get_default_free_blocks_flags(inode);
Andrey Sidorov18888cf2012-09-19 14:14:53 -04002489
Theodore Ts'o0aa06002011-09-09 18:54:51 -04002490 /*
2491 * For bigalloc file systems, we never free a partial cluster
2492 * at the beginning of the extent. Instead, we make a note
2493 * that we tried freeing the cluster, and check to see if we
2494 * need to free it on a subsequent call to ext4_remove_blocks,
Eric Whitney345ee942014-11-23 00:59:39 -05002495 * or at the end of ext4_ext_rm_leaf or ext4_ext_remove_space.
Theodore Ts'o0aa06002011-09-09 18:54:51 -04002496 */
2497 flags |= EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER;
2498
Aditya Kalid8990242011-09-09 19:18:51 -04002499 trace_ext4_remove_blocks(inode, ex, from, to, *partial_cluster);
Theodore Ts'o0aa06002011-09-09 18:54:51 -04002500 /*
2501 * If we have a partial cluster, and it's different from the
2502 * cluster of the last block, we need to explicitly free the
2503 * partial cluster here.
2504 */
2505 pblk = ext4_ext_pblock(ex) + ee_len - 1;
Eric Whitney345ee942014-11-23 00:59:39 -05002506 if (*partial_cluster > 0 &&
2507 *partial_cluster != (long long) EXT4_B2C(sbi, pblk)) {
Theodore Ts'o0aa06002011-09-09 18:54:51 -04002508 ext4_free_blocks(handle, inode, NULL,
2509 EXT4_C2B(sbi, *partial_cluster),
2510 sbi->s_cluster_ratio, flags);
2511 *partial_cluster = 0;
2512 }
2513
Alex Tomasa86c6182006-10-11 01:21:03 -07002514#ifdef EXTENTS_STATS
2515 {
2516 struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
Alex Tomasa86c6182006-10-11 01:21:03 -07002517 spin_lock(&sbi->s_ext_stats_lock);
2518 sbi->s_ext_blocks += ee_len;
2519 sbi->s_ext_extents++;
2520 if (ee_len < sbi->s_ext_min)
2521 sbi->s_ext_min = ee_len;
2522 if (ee_len > sbi->s_ext_max)
2523 sbi->s_ext_max = ee_len;
2524 if (ext_depth(inode) > sbi->s_depth_max)
2525 sbi->s_depth_max = ext_depth(inode);
2526 spin_unlock(&sbi->s_ext_stats_lock);
2527 }
2528#endif
2529 if (from >= le32_to_cpu(ex->ee_block)
Amit Aroraa2df2a62007-07-17 21:42:41 -04002530 && to == le32_to_cpu(ex->ee_block) + ee_len - 1) {
Alex Tomasa86c6182006-10-11 01:21:03 -07002531 /* tail removal */
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05002532 ext4_lblk_t num;
Eric Whitney345ee942014-11-23 00:59:39 -05002533 long long first_cluster;
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05002534
Amit Aroraa2df2a62007-07-17 21:42:41 -04002535 num = le32_to_cpu(ex->ee_block) + ee_len - from;
Theodore Ts'o0aa06002011-09-09 18:54:51 -04002536 pblk = ext4_ext_pblock(ex) + ee_len - num;
Lukas Czernerd23142c2013-05-27 23:33:35 -04002537 /*
2538 * Usually we want to free partial cluster at the end of the
2539 * extent, except for the situation when the cluster is still
2540 * used by any other extent (partial_cluster is negative).
2541 */
2542 if (*partial_cluster < 0 &&
Eric Whitney345ee942014-11-23 00:59:39 -05002543 *partial_cluster == -(long long) EXT4_B2C(sbi, pblk+num-1))
Lukas Czernerd23142c2013-05-27 23:33:35 -04002544 flags |= EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER;
2545
2546 ext_debug("free last %u blocks starting %llu partial %lld\n",
2547 num, pblk, *partial_cluster);
Theodore Ts'o0aa06002011-09-09 18:54:51 -04002548 ext4_free_blocks(handle, inode, NULL, pblk, num, flags);
2549 /*
2550 * If the block range to be freed didn't start at the
2551 * beginning of a cluster, and we removed the entire
Lukas Czernerd23142c2013-05-27 23:33:35 -04002552 * extent and the cluster is not used by any other extent,
2553 * save the partial cluster here, since we might need to
Eric Whitney345ee942014-11-23 00:59:39 -05002554 * delete if we determine that the truncate or punch hole
2555 * operation has removed all of the blocks in the cluster.
2556 * If that cluster is used by another extent, preserve its
2557 * negative value so it isn't freed later on.
Lukas Czernerd23142c2013-05-27 23:33:35 -04002558 *
Eric Whitney345ee942014-11-23 00:59:39 -05002559 * If the whole extent wasn't freed, we've reached the
2560 * start of the truncated/punched region and have finished
2561 * removing blocks. If there's a partial cluster here it's
2562 * shared with the remainder of the extent and is no longer
2563 * a candidate for removal.
Theodore Ts'o0aa06002011-09-09 18:54:51 -04002564 */
Eric Whitney345ee942014-11-23 00:59:39 -05002565 if (EXT4_PBLK_COFF(sbi, pblk) && ee_len == num) {
2566 first_cluster = (long long) EXT4_B2C(sbi, pblk);
2567 if (first_cluster != -*partial_cluster)
2568 *partial_cluster = first_cluster;
2569 } else {
Theodore Ts'o0aa06002011-09-09 18:54:51 -04002570 *partial_cluster = 0;
Eric Whitney345ee942014-11-23 00:59:39 -05002571 }
Lukas Czerner78fb9cd2013-05-27 23:32:35 -04002572 } else
2573 ext4_error(sbi->s_sb, "strange request: removal(2) "
2574 "%u-%u from %u:%u\n",
2575 from, to, le32_to_cpu(ex->ee_block), ee_len);
Alex Tomasa86c6182006-10-11 01:21:03 -07002576 return 0;
2577}
2578
Allison Hendersond583fb82011-05-25 07:41:43 -04002579
2580/*
2581 * ext4_ext_rm_leaf() Removes the extents associated with the
Eric Whitney5bf43762014-11-23 00:58:11 -05002582 * blocks appearing between "start" and "end". Both "start"
2583 * and "end" must appear in the same extent or EIO is returned.
Allison Hendersond583fb82011-05-25 07:41:43 -04002584 *
2585 * @handle: The journal handle
2586 * @inode: The files inode
2587 * @path: The path to the leaf
Lukas Czernerd23142c2013-05-27 23:33:35 -04002588 * @partial_cluster: The cluster which we'll have to free if all extents
Eric Whitney5bf43762014-11-23 00:58:11 -05002589 * has been released from it. However, if this value is
2590 * negative, it's a cluster just to the right of the
2591 * punched region and it must not be freed.
Allison Hendersond583fb82011-05-25 07:41:43 -04002592 * @start: The first block to remove
2593 * @end: The last block to remove
2594 */
Alex Tomasa86c6182006-10-11 01:21:03 -07002595static int
2596ext4_ext_rm_leaf(handle_t *handle, struct inode *inode,
Lukas Czernerd23142c2013-05-27 23:33:35 -04002597 struct ext4_ext_path *path,
2598 long long *partial_cluster,
Theodore Ts'o0aa06002011-09-09 18:54:51 -04002599 ext4_lblk_t start, ext4_lblk_t end)
Alex Tomasa86c6182006-10-11 01:21:03 -07002600{
Theodore Ts'o0aa06002011-09-09 18:54:51 -04002601 struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
Alex Tomasa86c6182006-10-11 01:21:03 -07002602 int err = 0, correct_index = 0;
2603 int depth = ext_depth(inode), credits;
2604 struct ext4_extent_header *eh;
Dmitry Monakhov750c9c42011-10-25 05:35:05 -04002605 ext4_lblk_t a, b;
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05002606 unsigned num;
2607 ext4_lblk_t ex_ee_block;
Alex Tomasa86c6182006-10-11 01:21:03 -07002608 unsigned short ex_ee_len;
Lukas Czerner556615d2014-04-20 23:45:47 -04002609 unsigned unwritten = 0;
Alex Tomasa86c6182006-10-11 01:21:03 -07002610 struct ext4_extent *ex;
Lukas Czernerd23142c2013-05-27 23:33:35 -04002611 ext4_fsblk_t pblk;
Alex Tomasa86c6182006-10-11 01:21:03 -07002612
Alex Tomasc29c0ae2007-07-18 09:19:09 -04002613 /* the header must be checked already in ext4_ext_remove_space() */
Lukas Czerner5f95d212012-03-19 23:03:19 -04002614 ext_debug("truncate since %u in leaf to %u\n", start, end);
Alex Tomasa86c6182006-10-11 01:21:03 -07002615 if (!path[depth].p_hdr)
2616 path[depth].p_hdr = ext_block_hdr(path[depth].p_bh);
2617 eh = path[depth].p_hdr;
Frank Mayhar273df552010-03-02 11:46:09 -05002618 if (unlikely(path[depth].p_hdr == NULL)) {
2619 EXT4_ERROR_INODE(inode, "path[%d].p_hdr == NULL", depth);
2620 return -EIO;
2621 }
Alex Tomasa86c6182006-10-11 01:21:03 -07002622 /* find where to start removing */
Ashish Sangwan6ae06ff2013-07-01 08:12:41 -04002623 ex = path[depth].p_ext;
2624 if (!ex)
2625 ex = EXT_LAST_EXTENT(eh);
Alex Tomasa86c6182006-10-11 01:21:03 -07002626
2627 ex_ee_block = le32_to_cpu(ex->ee_block);
Amit Aroraa2df2a62007-07-17 21:42:41 -04002628 ex_ee_len = ext4_ext_get_actual_len(ex);
Alex Tomasa86c6182006-10-11 01:21:03 -07002629
Aditya Kalid8990242011-09-09 19:18:51 -04002630 trace_ext4_ext_rm_leaf(inode, start, ex, *partial_cluster);
2631
Alex Tomasa86c6182006-10-11 01:21:03 -07002632 while (ex >= EXT_FIRST_EXTENT(eh) &&
2633 ex_ee_block + ex_ee_len > start) {
Aneesh Kumar K.Va41f2072009-06-10 14:22:55 -04002634
Lukas Czerner556615d2014-04-20 23:45:47 -04002635 if (ext4_ext_is_unwritten(ex))
2636 unwritten = 1;
Aneesh Kumar K.Va41f2072009-06-10 14:22:55 -04002637 else
Lukas Czerner556615d2014-04-20 23:45:47 -04002638 unwritten = 0;
Aneesh Kumar K.Va41f2072009-06-10 14:22:55 -04002639
Mingming553f9002009-09-18 13:34:55 -04002640 ext_debug("remove ext %u:[%d]%d\n", ex_ee_block,
Lukas Czerner556615d2014-04-20 23:45:47 -04002641 unwritten, ex_ee_len);
Alex Tomasa86c6182006-10-11 01:21:03 -07002642 path[depth].p_ext = ex;
2643
2644 a = ex_ee_block > start ? ex_ee_block : start;
Allison Hendersond583fb82011-05-25 07:41:43 -04002645 b = ex_ee_block+ex_ee_len - 1 < end ?
2646 ex_ee_block+ex_ee_len - 1 : end;
Alex Tomasa86c6182006-10-11 01:21:03 -07002647
2648 ext_debug(" border %u:%u\n", a, b);
2649
Allison Hendersond583fb82011-05-25 07:41:43 -04002650 /* If this extent is beyond the end of the hole, skip it */
Lukas Czerner5f95d212012-03-19 23:03:19 -04002651 if (end < ex_ee_block) {
Lukas Czernerd23142c2013-05-27 23:33:35 -04002652 /*
2653 * We're going to skip this extent and move to another,
Eric Whitneyf4226d92014-11-23 00:55:42 -05002654 * so note that its first cluster is in use to avoid
2655 * freeing it when removing blocks. Eventually, the
2656 * right edge of the truncated/punched region will
2657 * be just to the left.
Lukas Czernerd23142c2013-05-27 23:33:35 -04002658 */
Eric Whitneyf4226d92014-11-23 00:55:42 -05002659 if (sbi->s_cluster_ratio > 1) {
2660 pblk = ext4_ext_pblock(ex);
Lukas Czernerd23142c2013-05-27 23:33:35 -04002661 *partial_cluster =
Eric Whitneyf4226d92014-11-23 00:55:42 -05002662 -(long long) EXT4_B2C(sbi, pblk);
2663 }
Allison Hendersond583fb82011-05-25 07:41:43 -04002664 ex--;
2665 ex_ee_block = le32_to_cpu(ex->ee_block);
2666 ex_ee_len = ext4_ext_get_actual_len(ex);
2667 continue;
Dmitry Monakhov750c9c42011-10-25 05:35:05 -04002668 } else if (b != ex_ee_block + ex_ee_len - 1) {
Lukas Czernerdc1841d2012-03-19 23:07:43 -04002669 EXT4_ERROR_INODE(inode,
2670 "can not handle truncate %u:%u "
2671 "on extent %u:%u",
2672 start, end, ex_ee_block,
2673 ex_ee_block + ex_ee_len - 1);
Dmitry Monakhov750c9c42011-10-25 05:35:05 -04002674 err = -EIO;
2675 goto out;
Alex Tomasa86c6182006-10-11 01:21:03 -07002676 } else if (a != ex_ee_block) {
2677 /* remove tail of the extent */
Dmitry Monakhov750c9c42011-10-25 05:35:05 -04002678 num = a - ex_ee_block;
Alex Tomasa86c6182006-10-11 01:21:03 -07002679 } else {
2680 /* remove whole extent: excellent! */
Alex Tomasa86c6182006-10-11 01:21:03 -07002681 num = 0;
Alex Tomasa86c6182006-10-11 01:21:03 -07002682 }
Theodore Ts'o34071da2008-08-01 21:59:19 -04002683 /*
2684 * 3 for leaf, sb, and inode plus 2 (bmap and group
2685 * descriptor) for each block group; assume two block
2686 * groups plus ex_ee_len/blocks_per_block_group for
2687 * the worst case
2688 */
2689 credits = 7 + 2*(ex_ee_len/EXT4_BLOCKS_PER_GROUP(inode->i_sb));
Alex Tomasa86c6182006-10-11 01:21:03 -07002690 if (ex == EXT_FIRST_EXTENT(eh)) {
2691 correct_index = 1;
2692 credits += (ext_depth(inode)) + 1;
2693 }
Dmitry Monakhov5aca07e2009-12-08 22:42:15 -05002694 credits += EXT4_MAXQUOTAS_TRANS_BLOCKS(inode->i_sb);
Alex Tomasa86c6182006-10-11 01:21:03 -07002695
Jan Kara487caee2009-08-17 22:17:20 -04002696 err = ext4_ext_truncate_extend_restart(handle, inode, credits);
Shen Feng9102e4f2008-07-11 19:27:31 -04002697 if (err)
Alex Tomasa86c6182006-10-11 01:21:03 -07002698 goto out;
Alex Tomasa86c6182006-10-11 01:21:03 -07002699
2700 err = ext4_ext_get_access(handle, inode, path + depth);
2701 if (err)
2702 goto out;
2703
Theodore Ts'o0aa06002011-09-09 18:54:51 -04002704 err = ext4_remove_blocks(handle, inode, ex, partial_cluster,
2705 a, b);
Alex Tomasa86c6182006-10-11 01:21:03 -07002706 if (err)
2707 goto out;
2708
Dmitry Monakhov750c9c42011-10-25 05:35:05 -04002709 if (num == 0)
Randy Dunlapd0d856e2006-10-11 01:21:07 -07002710 /* this extent is removed; mark slot entirely unused */
Alex Tomasf65e6fb2006-10-11 01:21:05 -07002711 ext4_ext_store_pblock(ex, 0);
Alex Tomasa86c6182006-10-11 01:21:03 -07002712
Alex Tomasa86c6182006-10-11 01:21:03 -07002713 ex->ee_len = cpu_to_le16(num);
Amit Arora749269f2007-07-18 09:02:56 -04002714 /*
Lukas Czerner556615d2014-04-20 23:45:47 -04002715 * Do not mark unwritten if all the blocks in the
Amit Arora749269f2007-07-18 09:02:56 -04002716 * extent have been removed.
2717 */
Lukas Czerner556615d2014-04-20 23:45:47 -04002718 if (unwritten && num)
2719 ext4_ext_mark_unwritten(ex);
Allison Hendersond583fb82011-05-25 07:41:43 -04002720 /*
2721 * If the extent was completely released,
2722 * we need to remove it from the leaf
2723 */
2724 if (num == 0) {
Lukas Czernerf17722f2011-06-06 00:05:17 -04002725 if (end != EXT_MAX_BLOCKS - 1) {
Allison Hendersond583fb82011-05-25 07:41:43 -04002726 /*
2727 * For hole punching, we need to scoot all the
2728 * extents up when an extent is removed so that
2729 * we dont have blank extents in the middle
2730 */
2731 memmove(ex, ex+1, (EXT_LAST_EXTENT(eh) - ex) *
2732 sizeof(struct ext4_extent));
2733
2734 /* Now get rid of the one at the end */
2735 memset(EXT_LAST_EXTENT(eh), 0,
2736 sizeof(struct ext4_extent));
2737 }
2738 le16_add_cpu(&eh->eh_entries, -1);
Eric Whitney5bf43762014-11-23 00:58:11 -05002739 }
Allison Hendersond583fb82011-05-25 07:41:43 -04002740
Dmitry Monakhov750c9c42011-10-25 05:35:05 -04002741 err = ext4_ext_dirty(handle, inode, path + depth);
2742 if (err)
2743 goto out;
2744
Yongqiang Yangbf52c6f2011-11-01 18:59:26 -04002745 ext_debug("new extent: %u:%u:%llu\n", ex_ee_block, num,
Theodore Ts'obf89d162010-10-27 21:30:14 -04002746 ext4_ext_pblock(ex));
Alex Tomasa86c6182006-10-11 01:21:03 -07002747 ex--;
2748 ex_ee_block = le32_to_cpu(ex->ee_block);
Amit Aroraa2df2a62007-07-17 21:42:41 -04002749 ex_ee_len = ext4_ext_get_actual_len(ex);
Alex Tomasa86c6182006-10-11 01:21:03 -07002750 }
2751
2752 if (correct_index && eh->eh_entries)
2753 err = ext4_ext_correct_indexes(handle, inode, path);
2754
Theodore Ts'o0aa06002011-09-09 18:54:51 -04002755 /*
Eric Whitneyad6599a2014-04-01 19:49:30 -04002756 * If there's a partial cluster and at least one extent remains in
2757 * the leaf, free the partial cluster if it isn't shared with the
Eric Whitney5bf43762014-11-23 00:58:11 -05002758 * current extent. If it is shared with the current extent
2759 * we zero partial_cluster because we've reached the start of the
2760 * truncated/punched region and we're done removing blocks.
Theodore Ts'o0aa06002011-09-09 18:54:51 -04002761 */
Eric Whitney5bf43762014-11-23 00:58:11 -05002762 if (*partial_cluster > 0 && ex >= EXT_FIRST_EXTENT(eh)) {
2763 pblk = ext4_ext_pblock(ex) + ex_ee_len - 1;
2764 if (*partial_cluster != (long long) EXT4_B2C(sbi, pblk)) {
2765 ext4_free_blocks(handle, inode, NULL,
2766 EXT4_C2B(sbi, *partial_cluster),
2767 sbi->s_cluster_ratio,
2768 get_default_free_blocks_flags(inode));
2769 }
Theodore Ts'o0aa06002011-09-09 18:54:51 -04002770 *partial_cluster = 0;
2771 }
2772
Alex Tomasa86c6182006-10-11 01:21:03 -07002773 /* if this leaf is free, then we should
2774 * remove it from index block above */
2775 if (err == 0 && eh->eh_entries == 0 && path[depth].p_bh != NULL)
Forrest Liuc36575e2012-12-17 09:55:39 -05002776 err = ext4_ext_rm_idx(handle, inode, path, depth);
Alex Tomasa86c6182006-10-11 01:21:03 -07002777
2778out:
2779 return err;
2780}
2781
2782/*
Randy Dunlapd0d856e2006-10-11 01:21:07 -07002783 * ext4_ext_more_to_rm:
2784 * returns 1 if current index has to be freed (even partial)
Alex Tomasa86c6182006-10-11 01:21:03 -07002785 */
Avantika Mathur09b88252006-12-06 20:41:36 -08002786static int
Alex Tomasa86c6182006-10-11 01:21:03 -07002787ext4_ext_more_to_rm(struct ext4_ext_path *path)
2788{
2789 BUG_ON(path->p_idx == NULL);
2790
2791 if (path->p_idx < EXT_FIRST_INDEX(path->p_hdr))
2792 return 0;
2793
2794 /*
Randy Dunlapd0d856e2006-10-11 01:21:07 -07002795 * if truncate on deeper level happened, it wasn't partial,
Alex Tomasa86c6182006-10-11 01:21:03 -07002796 * so we have to consider current index for truncation
2797 */
2798 if (le16_to_cpu(path->p_hdr->eh_entries) == path->p_block)
2799 return 0;
2800 return 1;
2801}
2802
Theodore Ts'o26a4c0c2013-04-03 12:45:17 -04002803int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start,
2804 ext4_lblk_t end)
Alex Tomasa86c6182006-10-11 01:21:03 -07002805{
Eric Whitneyf4226d92014-11-23 00:55:42 -05002806 struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
Alex Tomasa86c6182006-10-11 01:21:03 -07002807 int depth = ext_depth(inode);
Ashish Sangwan968dee72012-07-22 22:49:08 -04002808 struct ext4_ext_path *path = NULL;
Lukas Czernerd23142c2013-05-27 23:33:35 -04002809 long long partial_cluster = 0;
Alex Tomasa86c6182006-10-11 01:21:03 -07002810 handle_t *handle;
Dmitry Monakhov6f2080e2012-09-30 23:03:50 -04002811 int i = 0, err = 0;
Alex Tomasa86c6182006-10-11 01:21:03 -07002812
Lukas Czerner5f95d212012-03-19 23:03:19 -04002813 ext_debug("truncate since %u to %u\n", start, end);
Alex Tomasa86c6182006-10-11 01:21:03 -07002814
2815 /* probably first extent we're gonna free will be last in block */
Theodore Ts'o9924a922013-02-08 21:59:22 -05002816 handle = ext4_journal_start(inode, EXT4_HT_TRUNCATE, depth + 1);
Alex Tomasa86c6182006-10-11 01:21:03 -07002817 if (IS_ERR(handle))
2818 return PTR_ERR(handle);
2819
Dmitry Monakhov0617b832010-05-17 01:00:00 -04002820again:
Lukas Czerner61801322013-05-27 23:32:35 -04002821 trace_ext4_ext_remove_space(inode, start, end, depth);
Aditya Kalid8990242011-09-09 19:18:51 -04002822
Alex Tomasa86c6182006-10-11 01:21:03 -07002823 /*
Lukas Czerner5f95d212012-03-19 23:03:19 -04002824 * Check if we are removing extents inside the extent tree. If that
2825 * is the case, we are going to punch a hole inside the extent tree
2826 * so we have to check whether we need to split the extent covering
2827 * the last block to remove so we can easily remove the part of it
2828 * in ext4_ext_rm_leaf().
2829 */
2830 if (end < EXT_MAX_BLOCKS - 1) {
2831 struct ext4_extent *ex;
Eric Whitneyf4226d92014-11-23 00:55:42 -05002832 ext4_lblk_t ee_block, ex_end, lblk;
2833 ext4_fsblk_t pblk;
Lukas Czerner5f95d212012-03-19 23:03:19 -04002834
Eric Whitneyf4226d92014-11-23 00:55:42 -05002835 /* find extent for or closest extent to this block */
Theodore Ts'oed8a1a72014-09-01 14:43:09 -04002836 path = ext4_find_extent(inode, end, NULL, EXT4_EX_NOCACHE);
Lukas Czerner5f95d212012-03-19 23:03:19 -04002837 if (IS_ERR(path)) {
2838 ext4_journal_stop(handle);
2839 return PTR_ERR(path);
2840 }
2841 depth = ext_depth(inode);
Dmitry Monakhov6f2080e2012-09-30 23:03:50 -04002842 /* Leaf not may not exist only if inode has no blocks at all */
Lukas Czerner5f95d212012-03-19 23:03:19 -04002843 ex = path[depth].p_ext;
Ashish Sangwan968dee72012-07-22 22:49:08 -04002844 if (!ex) {
Dmitry Monakhov6f2080e2012-09-30 23:03:50 -04002845 if (depth) {
2846 EXT4_ERROR_INODE(inode,
2847 "path[%d].p_hdr == NULL",
2848 depth);
2849 err = -EIO;
2850 }
2851 goto out;
Ashish Sangwan968dee72012-07-22 22:49:08 -04002852 }
Lukas Czerner5f95d212012-03-19 23:03:19 -04002853
2854 ee_block = le32_to_cpu(ex->ee_block);
Eric Whitneyf4226d92014-11-23 00:55:42 -05002855 ex_end = ee_block + ext4_ext_get_actual_len(ex) - 1;
Lukas Czerner5f95d212012-03-19 23:03:19 -04002856
2857 /*
2858 * See if the last block is inside the extent, if so split
2859 * the extent at 'end' block so we can easily remove the
2860 * tail of the first part of the split extent in
2861 * ext4_ext_rm_leaf().
2862 */
Eric Whitneyf4226d92014-11-23 00:55:42 -05002863 if (end >= ee_block && end < ex_end) {
2864
2865 /*
2866 * If we're going to split the extent, note that
2867 * the cluster containing the block after 'end' is
2868 * in use to avoid freeing it when removing blocks.
2869 */
2870 if (sbi->s_cluster_ratio > 1) {
2871 pblk = ext4_ext_pblock(ex) + end - ee_block + 2;
2872 partial_cluster =
2873 -(long long) EXT4_B2C(sbi, pblk);
2874 }
2875
Lukas Czerner5f95d212012-03-19 23:03:19 -04002876 /*
2877 * Split the extent in two so that 'end' is the last
Lukas Czerner27dd4382013-04-09 22:11:22 -04002878 * block in the first new extent. Also we should not
2879 * fail removing space due to ENOSPC so try to use
2880 * reserved block if that happens.
Lukas Czerner5f95d212012-03-19 23:03:19 -04002881 */
Theodore Ts'odfe50802014-09-01 14:37:09 -04002882 err = ext4_force_split_extent_at(handle, inode, &path,
Dmitry Monakhovfcf6b1b72014-08-30 23:52:19 -04002883 end + 1, 1);
Lukas Czerner5f95d212012-03-19 23:03:19 -04002884 if (err < 0)
2885 goto out;
Eric Whitneyf4226d92014-11-23 00:55:42 -05002886
2887 } else if (sbi->s_cluster_ratio > 1 && end >= ex_end) {
2888 /*
2889 * If there's an extent to the right its first cluster
2890 * contains the immediate right boundary of the
2891 * truncated/punched region. Set partial_cluster to
2892 * its negative value so it won't be freed if shared
2893 * with the current extent. The end < ee_block case
2894 * is handled in ext4_ext_rm_leaf().
2895 */
2896 lblk = ex_end + 1;
2897 err = ext4_ext_search_right(inode, path, &lblk, &pblk,
2898 &ex);
2899 if (err)
2900 goto out;
2901 if (pblk)
2902 partial_cluster =
2903 -(long long) EXT4_B2C(sbi, pblk);
Lukas Czerner5f95d212012-03-19 23:03:19 -04002904 }
Lukas Czerner5f95d212012-03-19 23:03:19 -04002905 }
Lukas Czerner5f95d212012-03-19 23:03:19 -04002906 /*
Randy Dunlapd0d856e2006-10-11 01:21:07 -07002907 * We start scanning from right side, freeing all the blocks
2908 * after i_size and walking into the tree depth-wise.
Alex Tomasa86c6182006-10-11 01:21:03 -07002909 */
Dmitry Monakhov0617b832010-05-17 01:00:00 -04002910 depth = ext_depth(inode);
Ashish Sangwan968dee72012-07-22 22:49:08 -04002911 if (path) {
2912 int k = i = depth;
2913 while (--k > 0)
2914 path[k].p_block =
2915 le16_to_cpu(path[k].p_hdr->eh_entries)+1;
2916 } else {
2917 path = kzalloc(sizeof(struct ext4_ext_path) * (depth + 1),
2918 GFP_NOFS);
2919 if (path == NULL) {
2920 ext4_journal_stop(handle);
2921 return -ENOMEM;
2922 }
Theodore Ts'o10809df82014-09-01 14:40:09 -04002923 path[0].p_maxdepth = path[0].p_depth = depth;
Ashish Sangwan968dee72012-07-22 22:49:08 -04002924 path[0].p_hdr = ext_inode_hdr(inode);
Theodore Ts'o89a4e482012-08-17 08:54:52 -04002925 i = 0;
Lukas Czerner5f95d212012-03-19 23:03:19 -04002926
Theodore Ts'oc3491792013-08-16 21:21:41 -04002927 if (ext4_ext_check(inode, path[0].p_hdr, depth, 0)) {
Ashish Sangwan968dee72012-07-22 22:49:08 -04002928 err = -EIO;
2929 goto out;
2930 }
Alex Tomasa86c6182006-10-11 01:21:03 -07002931 }
Ashish Sangwan968dee72012-07-22 22:49:08 -04002932 err = 0;
Alex Tomasa86c6182006-10-11 01:21:03 -07002933
2934 while (i >= 0 && err == 0) {
2935 if (i == depth) {
2936 /* this is leaf block */
Allison Hendersond583fb82011-05-25 07:41:43 -04002937 err = ext4_ext_rm_leaf(handle, inode, path,
Theodore Ts'o0aa06002011-09-09 18:54:51 -04002938 &partial_cluster, start,
Lukas Czerner5f95d212012-03-19 23:03:19 -04002939 end);
Randy Dunlapd0d856e2006-10-11 01:21:07 -07002940 /* root level has p_bh == NULL, brelse() eats this */
Alex Tomasa86c6182006-10-11 01:21:03 -07002941 brelse(path[i].p_bh);
2942 path[i].p_bh = NULL;
2943 i--;
2944 continue;
2945 }
2946
2947 /* this is index block */
2948 if (!path[i].p_hdr) {
2949 ext_debug("initialize header\n");
2950 path[i].p_hdr = ext_block_hdr(path[i].p_bh);
Alex Tomasa86c6182006-10-11 01:21:03 -07002951 }
2952
Alex Tomasa86c6182006-10-11 01:21:03 -07002953 if (!path[i].p_idx) {
Randy Dunlapd0d856e2006-10-11 01:21:07 -07002954 /* this level hasn't been touched yet */
Alex Tomasa86c6182006-10-11 01:21:03 -07002955 path[i].p_idx = EXT_LAST_INDEX(path[i].p_hdr);
2956 path[i].p_block = le16_to_cpu(path[i].p_hdr->eh_entries)+1;
2957 ext_debug("init index ptr: hdr 0x%p, num %d\n",
2958 path[i].p_hdr,
2959 le16_to_cpu(path[i].p_hdr->eh_entries));
2960 } else {
Randy Dunlapd0d856e2006-10-11 01:21:07 -07002961 /* we were already here, see at next index */
Alex Tomasa86c6182006-10-11 01:21:03 -07002962 path[i].p_idx--;
2963 }
2964
2965 ext_debug("level %d - index, first 0x%p, cur 0x%p\n",
2966 i, EXT_FIRST_INDEX(path[i].p_hdr),
2967 path[i].p_idx);
2968 if (ext4_ext_more_to_rm(path + i)) {
Alex Tomasc29c0ae2007-07-18 09:19:09 -04002969 struct buffer_head *bh;
Alex Tomasa86c6182006-10-11 01:21:03 -07002970 /* go to the next level */
Mingming Cao2ae02102006-10-11 01:21:11 -07002971 ext_debug("move to level %d (block %llu)\n",
Theodore Ts'obf89d162010-10-27 21:30:14 -04002972 i + 1, ext4_idx_pblock(path[i].p_idx));
Alex Tomasa86c6182006-10-11 01:21:03 -07002973 memset(path + i + 1, 0, sizeof(*path));
Theodore Ts'o7d7ea892013-08-16 21:20:41 -04002974 bh = read_extent_tree_block(inode,
Theodore Ts'o107a7bd2013-08-16 21:23:41 -04002975 ext4_idx_pblock(path[i].p_idx), depth - i - 1,
2976 EXT4_EX_NOCACHE);
Theodore Ts'o7d7ea892013-08-16 21:20:41 -04002977 if (IS_ERR(bh)) {
Alex Tomasa86c6182006-10-11 01:21:03 -07002978 /* should we reset i_size? */
Theodore Ts'o7d7ea892013-08-16 21:20:41 -04002979 err = PTR_ERR(bh);
Alex Tomasa86c6182006-10-11 01:21:03 -07002980 break;
2981 }
Theodore Ts'o76828c82013-07-15 12:27:47 -04002982 /* Yield here to deal with large extent trees.
2983 * Should be a no-op if we did IO above. */
2984 cond_resched();
Alex Tomasc29c0ae2007-07-18 09:19:09 -04002985 if (WARN_ON(i + 1 > depth)) {
2986 err = -EIO;
2987 break;
2988 }
Alex Tomasc29c0ae2007-07-18 09:19:09 -04002989 path[i + 1].p_bh = bh;
Alex Tomasa86c6182006-10-11 01:21:03 -07002990
Randy Dunlapd0d856e2006-10-11 01:21:07 -07002991 /* save actual number of indexes since this
2992 * number is changed at the next iteration */
Alex Tomasa86c6182006-10-11 01:21:03 -07002993 path[i].p_block = le16_to_cpu(path[i].p_hdr->eh_entries);
2994 i++;
2995 } else {
Randy Dunlapd0d856e2006-10-11 01:21:07 -07002996 /* we finished processing this index, go up */
Alex Tomasa86c6182006-10-11 01:21:03 -07002997 if (path[i].p_hdr->eh_entries == 0 && i > 0) {
Randy Dunlapd0d856e2006-10-11 01:21:07 -07002998 /* index is empty, remove it;
Alex Tomasa86c6182006-10-11 01:21:03 -07002999 * handle must be already prepared by the
3000 * truncatei_leaf() */
Forrest Liuc36575e2012-12-17 09:55:39 -05003001 err = ext4_ext_rm_idx(handle, inode, path, i);
Alex Tomasa86c6182006-10-11 01:21:03 -07003002 }
Randy Dunlapd0d856e2006-10-11 01:21:07 -07003003 /* root level has p_bh == NULL, brelse() eats this */
Alex Tomasa86c6182006-10-11 01:21:03 -07003004 brelse(path[i].p_bh);
3005 path[i].p_bh = NULL;
3006 i--;
3007 ext_debug("return to level %d\n", i);
3008 }
3009 }
3010
Lukas Czerner61801322013-05-27 23:32:35 -04003011 trace_ext4_ext_remove_space_done(inode, start, end, depth,
3012 partial_cluster, path->p_hdr->eh_entries);
Aditya Kalid8990242011-09-09 19:18:51 -04003013
Eric Whitney0756b902014-11-23 00:59:39 -05003014 /*
3015 * If we still have something in the partial cluster and we have removed
Aditya Kali7b415bf2011-09-09 19:04:51 -04003016 * even the first extent, then we should free the blocks in the partial
Eric Whitney0756b902014-11-23 00:59:39 -05003017 * cluster as well. (This code will only run when there are no leaves
3018 * to the immediate left of the truncated/punched region.)
3019 */
3020 if (partial_cluster > 0 && err == 0) {
3021 /* don't zero partial_cluster since it's not used afterwards */
Aditya Kali7b415bf2011-09-09 19:04:51 -04003022 ext4_free_blocks(handle, inode, NULL,
Eric Whitneyf4226d92014-11-23 00:55:42 -05003023 EXT4_C2B(sbi, partial_cluster),
Eric Whitney0756b902014-11-23 00:59:39 -05003024 sbi->s_cluster_ratio,
3025 get_default_free_blocks_flags(inode));
Aditya Kali7b415bf2011-09-09 19:04:51 -04003026 }
3027
Alex Tomasa86c6182006-10-11 01:21:03 -07003028 /* TODO: flexible tree reduction should be here */
3029 if (path->p_hdr->eh_entries == 0) {
3030 /*
Randy Dunlapd0d856e2006-10-11 01:21:07 -07003031 * truncate to zero freed all the tree,
3032 * so we need to correct eh_depth
Alex Tomasa86c6182006-10-11 01:21:03 -07003033 */
3034 err = ext4_ext_get_access(handle, inode, path);
3035 if (err == 0) {
3036 ext_inode_hdr(inode)->eh_depth = 0;
3037 ext_inode_hdr(inode)->eh_max =
Theodore Ts'o55ad63b2009-08-28 10:40:33 -04003038 cpu_to_le16(ext4_ext_space_root(inode, 0));
Alex Tomasa86c6182006-10-11 01:21:03 -07003039 err = ext4_ext_dirty(handle, inode, path);
3040 }
3041 }
3042out:
Theodore Ts'ob7ea89a2014-09-01 14:39:09 -04003043 ext4_ext_drop_refs(path);
3044 kfree(path);
3045 path = NULL;
Theodore Ts'odfe50802014-09-01 14:37:09 -04003046 if (err == -EAGAIN)
3047 goto again;
Alex Tomasa86c6182006-10-11 01:21:03 -07003048 ext4_journal_stop(handle);
3049
3050 return err;
3051}
3052
3053/*
3054 * called at mount time
3055 */
3056void ext4_ext_init(struct super_block *sb)
3057{
3058 /*
3059 * possible initialization would be here
3060 */
3061
Theodore Ts'o83982b62009-01-06 14:53:16 -05003062 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS)) {
Theodore Ts'o90576c02009-09-29 15:51:30 -04003063#if defined(AGGRESSIVE_TEST) || defined(CHECK_BINSEARCH) || defined(EXTENTS_STATS)
Theodore Ts'o92b97812012-03-19 23:41:49 -04003064 printk(KERN_INFO "EXT4-fs: file extents enabled"
Robert P. J. Daybbf2f9f2007-02-17 19:20:16 +01003065#ifdef AGGRESSIVE_TEST
Theodore Ts'o92b97812012-03-19 23:41:49 -04003066 ", aggressive tests"
Alex Tomasa86c6182006-10-11 01:21:03 -07003067#endif
3068#ifdef CHECK_BINSEARCH
Theodore Ts'o92b97812012-03-19 23:41:49 -04003069 ", check binsearch"
Alex Tomasa86c6182006-10-11 01:21:03 -07003070#endif
3071#ifdef EXTENTS_STATS
Theodore Ts'o92b97812012-03-19 23:41:49 -04003072 ", stats"
Alex Tomasa86c6182006-10-11 01:21:03 -07003073#endif
Theodore Ts'o92b97812012-03-19 23:41:49 -04003074 "\n");
Theodore Ts'o90576c02009-09-29 15:51:30 -04003075#endif
Alex Tomasa86c6182006-10-11 01:21:03 -07003076#ifdef EXTENTS_STATS
3077 spin_lock_init(&EXT4_SB(sb)->s_ext_stats_lock);
3078 EXT4_SB(sb)->s_ext_min = 1 << 30;
3079 EXT4_SB(sb)->s_ext_max = 0;
3080#endif
3081 }
3082}
3083
3084/*
3085 * called at umount time
3086 */
3087void ext4_ext_release(struct super_block *sb)
3088{
Theodore Ts'o83982b62009-01-06 14:53:16 -05003089 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS))
Alex Tomasa86c6182006-10-11 01:21:03 -07003090 return;
3091
3092#ifdef EXTENTS_STATS
3093 if (EXT4_SB(sb)->s_ext_blocks && EXT4_SB(sb)->s_ext_extents) {
3094 struct ext4_sb_info *sbi = EXT4_SB(sb);
3095 printk(KERN_ERR "EXT4-fs: %lu blocks in %lu extents (%lu ave)\n",
3096 sbi->s_ext_blocks, sbi->s_ext_extents,
3097 sbi->s_ext_blocks / sbi->s_ext_extents);
3098 printk(KERN_ERR "EXT4-fs: extents: %lu min, %lu max, max depth %lu\n",
3099 sbi->s_ext_min, sbi->s_ext_max, sbi->s_depth_max);
3100 }
3101#endif
3102}
3103
Zheng Liud7b2a002013-08-28 14:47:06 -04003104static int ext4_zeroout_es(struct inode *inode, struct ext4_extent *ex)
3105{
3106 ext4_lblk_t ee_block;
3107 ext4_fsblk_t ee_pblock;
3108 unsigned int ee_len;
3109
3110 ee_block = le32_to_cpu(ex->ee_block);
3111 ee_len = ext4_ext_get_actual_len(ex);
3112 ee_pblock = ext4_ext_pblock(ex);
3113
3114 if (ee_len == 0)
3115 return 0;
3116
3117 return ext4_es_insert_extent(inode, ee_block, ee_len, ee_pblock,
3118 EXTENT_STATUS_WRITTEN);
3119}
3120
Aneesh Kumar K.V093a0882008-04-29 08:11:12 -04003121/* FIXME!! we need to try to merge to left or right after zero-out */
3122static int ext4_ext_zeroout(struct inode *inode, struct ext4_extent *ex)
3123{
Lukas Czerner24075182010-10-27 21:30:06 -04003124 ext4_fsblk_t ee_pblock;
3125 unsigned int ee_len;
Jing Zhangb7203032010-05-12 00:00:00 -04003126 int ret;
Aneesh Kumar K.V093a0882008-04-29 08:11:12 -04003127
Aneesh Kumar K.V093a0882008-04-29 08:11:12 -04003128 ee_len = ext4_ext_get_actual_len(ex);
Theodore Ts'obf89d162010-10-27 21:30:14 -04003129 ee_pblock = ext4_ext_pblock(ex);
Aneesh Kumar K.V093a0882008-04-29 08:11:12 -04003130
Theodore Ts'oa107e5a2010-10-27 23:44:47 -04003131 ret = sb_issue_zeroout(inode->i_sb, ee_pblock, ee_len, GFP_NOFS);
Lukas Czerner24075182010-10-27 21:30:06 -04003132 if (ret > 0)
3133 ret = 0;
Aneesh Kumar K.V093a0882008-04-29 08:11:12 -04003134
Lukas Czerner24075182010-10-27 21:30:06 -04003135 return ret;
Aneesh Kumar K.V093a0882008-04-29 08:11:12 -04003136}
3137
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003138/*
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003139 * ext4_split_extent_at() splits an extent at given block.
3140 *
3141 * @handle: the journal handle
3142 * @inode: the file inode
3143 * @path: the path to the extent
3144 * @split: the logical block where the extent is splitted.
3145 * @split_flags: indicates if the extent could be zeroout if split fails, and
Lukas Czerner556615d2014-04-20 23:45:47 -04003146 * the states(init or unwritten) of new extents.
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003147 * @flags: flags used to insert new extent to extent tree.
3148 *
3149 *
3150 * Splits extent [a, b] into two extents [a, @split) and [@split, b], states
3151 * of which are deterimined by split_flag.
3152 *
3153 * There are two cases:
3154 * a> the extent are splitted into two extent.
3155 * b> split is not needed, and just mark the extent.
3156 *
3157 * return 0 on success.
3158 */
3159static int ext4_split_extent_at(handle_t *handle,
3160 struct inode *inode,
Theodore Ts'odfe50802014-09-01 14:37:09 -04003161 struct ext4_ext_path **ppath,
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003162 ext4_lblk_t split,
3163 int split_flag,
3164 int flags)
3165{
Theodore Ts'odfe50802014-09-01 14:37:09 -04003166 struct ext4_ext_path *path = *ppath;
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003167 ext4_fsblk_t newblock;
3168 ext4_lblk_t ee_block;
Zheng Liuadb23552013-03-10 21:13:05 -04003169 struct ext4_extent *ex, newex, orig_ex, zero_ex;
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003170 struct ext4_extent *ex2 = NULL;
3171 unsigned int ee_len, depth;
3172 int err = 0;
3173
Dmitry Monakhovdee1f972012-10-10 01:04:58 -04003174 BUG_ON((split_flag & (EXT4_EXT_DATA_VALID1 | EXT4_EXT_DATA_VALID2)) ==
3175 (EXT4_EXT_DATA_VALID1 | EXT4_EXT_DATA_VALID2));
3176
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003177 ext_debug("ext4_split_extents_at: inode %lu, logical"
3178 "block %llu\n", inode->i_ino, (unsigned long long)split);
3179
3180 ext4_ext_show_leaf(inode, path);
3181
3182 depth = ext_depth(inode);
3183 ex = path[depth].p_ext;
3184 ee_block = le32_to_cpu(ex->ee_block);
3185 ee_len = ext4_ext_get_actual_len(ex);
3186 newblock = split - ee_block + ext4_ext_pblock(ex);
3187
3188 BUG_ON(split < ee_block || split >= (ee_block + ee_len));
Lukas Czerner556615d2014-04-20 23:45:47 -04003189 BUG_ON(!ext4_ext_is_unwritten(ex) &&
Dmitry Monakhov357b66f2013-03-04 00:34:34 -05003190 split_flag & (EXT4_EXT_MAY_ZEROOUT |
Lukas Czerner556615d2014-04-20 23:45:47 -04003191 EXT4_EXT_MARK_UNWRIT1 |
3192 EXT4_EXT_MARK_UNWRIT2));
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003193
3194 err = ext4_ext_get_access(handle, inode, path + depth);
3195 if (err)
3196 goto out;
3197
3198 if (split == ee_block) {
3199 /*
3200 * case b: block @split is the block that the extent begins with
3201 * then we just change the state of the extent, and splitting
3202 * is not needed.
3203 */
Lukas Czerner556615d2014-04-20 23:45:47 -04003204 if (split_flag & EXT4_EXT_MARK_UNWRIT2)
3205 ext4_ext_mark_unwritten(ex);
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003206 else
3207 ext4_ext_mark_initialized(ex);
3208
3209 if (!(flags & EXT4_GET_BLOCKS_PRE_IO))
Theodore Ts'oecb94f52012-08-17 09:44:17 -04003210 ext4_ext_try_to_merge(handle, inode, path, ex);
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003211
Theodore Ts'oecb94f52012-08-17 09:44:17 -04003212 err = ext4_ext_dirty(handle, inode, path + path->p_depth);
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003213 goto out;
3214 }
3215
3216 /* case a */
3217 memcpy(&orig_ex, ex, sizeof(orig_ex));
3218 ex->ee_len = cpu_to_le16(split - ee_block);
Lukas Czerner556615d2014-04-20 23:45:47 -04003219 if (split_flag & EXT4_EXT_MARK_UNWRIT1)
3220 ext4_ext_mark_unwritten(ex);
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003221
3222 /*
3223 * path may lead to new leaf, not to original leaf any more
3224 * after ext4_ext_insert_extent() returns,
3225 */
3226 err = ext4_ext_dirty(handle, inode, path + depth);
3227 if (err)
3228 goto fix_extent_len;
3229
3230 ex2 = &newex;
3231 ex2->ee_block = cpu_to_le32(split);
3232 ex2->ee_len = cpu_to_le16(ee_len - (split - ee_block));
3233 ext4_ext_store_pblock(ex2, newblock);
Lukas Czerner556615d2014-04-20 23:45:47 -04003234 if (split_flag & EXT4_EXT_MARK_UNWRIT2)
3235 ext4_ext_mark_unwritten(ex2);
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003236
Theodore Ts'odfe50802014-09-01 14:37:09 -04003237 err = ext4_ext_insert_extent(handle, inode, ppath, &newex, flags);
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003238 if (err == -ENOSPC && (EXT4_EXT_MAY_ZEROOUT & split_flag)) {
Dmitry Monakhovdee1f972012-10-10 01:04:58 -04003239 if (split_flag & (EXT4_EXT_DATA_VALID1|EXT4_EXT_DATA_VALID2)) {
Zheng Liuadb23552013-03-10 21:13:05 -04003240 if (split_flag & EXT4_EXT_DATA_VALID1) {
Dmitry Monakhovdee1f972012-10-10 01:04:58 -04003241 err = ext4_ext_zeroout(inode, ex2);
Zheng Liuadb23552013-03-10 21:13:05 -04003242 zero_ex.ee_block = ex2->ee_block;
Zheng Liu8cde7ad2013-04-03 12:27:18 -04003243 zero_ex.ee_len = cpu_to_le16(
3244 ext4_ext_get_actual_len(ex2));
Zheng Liuadb23552013-03-10 21:13:05 -04003245 ext4_ext_store_pblock(&zero_ex,
3246 ext4_ext_pblock(ex2));
3247 } else {
Dmitry Monakhovdee1f972012-10-10 01:04:58 -04003248 err = ext4_ext_zeroout(inode, ex);
Zheng Liuadb23552013-03-10 21:13:05 -04003249 zero_ex.ee_block = ex->ee_block;
Zheng Liu8cde7ad2013-04-03 12:27:18 -04003250 zero_ex.ee_len = cpu_to_le16(
3251 ext4_ext_get_actual_len(ex));
Zheng Liuadb23552013-03-10 21:13:05 -04003252 ext4_ext_store_pblock(&zero_ex,
3253 ext4_ext_pblock(ex));
3254 }
3255 } else {
Dmitry Monakhovdee1f972012-10-10 01:04:58 -04003256 err = ext4_ext_zeroout(inode, &orig_ex);
Zheng Liuadb23552013-03-10 21:13:05 -04003257 zero_ex.ee_block = orig_ex.ee_block;
Zheng Liu8cde7ad2013-04-03 12:27:18 -04003258 zero_ex.ee_len = cpu_to_le16(
3259 ext4_ext_get_actual_len(&orig_ex));
Zheng Liuadb23552013-03-10 21:13:05 -04003260 ext4_ext_store_pblock(&zero_ex,
3261 ext4_ext_pblock(&orig_ex));
3262 }
Dmitry Monakhovdee1f972012-10-10 01:04:58 -04003263
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003264 if (err)
3265 goto fix_extent_len;
3266 /* update the extent length and mark as initialized */
Al Viroaf1584f2012-04-12 20:32:25 -04003267 ex->ee_len = cpu_to_le16(ee_len);
Theodore Ts'oecb94f52012-08-17 09:44:17 -04003268 ext4_ext_try_to_merge(handle, inode, path, ex);
3269 err = ext4_ext_dirty(handle, inode, path + path->p_depth);
Zheng Liuadb23552013-03-10 21:13:05 -04003270 if (err)
3271 goto fix_extent_len;
3272
3273 /* update extent status tree */
Zheng Liud7b2a002013-08-28 14:47:06 -04003274 err = ext4_zeroout_es(inode, &zero_ex);
Zheng Liuadb23552013-03-10 21:13:05 -04003275
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003276 goto out;
3277 } else if (err)
3278 goto fix_extent_len;
3279
3280out:
3281 ext4_ext_show_leaf(inode, path);
3282 return err;
3283
3284fix_extent_len:
3285 ex->ee_len = orig_ex.ee_len;
Dmitry Monakhov29faed12014-07-27 22:30:29 -04003286 ext4_ext_dirty(handle, inode, path + path->p_depth);
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003287 return err;
3288}
3289
3290/*
3291 * ext4_split_extents() splits an extent and mark extent which is covered
3292 * by @map as split_flags indicates
3293 *
Anatol Pomozov70261f52013-08-28 14:40:12 -04003294 * It may result in splitting the extent into multiple extents (up to three)
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003295 * There are three possibilities:
3296 * a> There is no split required
3297 * b> Splits in two extents: Split is happening at either end of the extent
3298 * c> Splits in three extents: Somone is splitting in middle of the extent
3299 *
3300 */
3301static int ext4_split_extent(handle_t *handle,
3302 struct inode *inode,
Theodore Ts'odfe50802014-09-01 14:37:09 -04003303 struct ext4_ext_path **ppath,
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003304 struct ext4_map_blocks *map,
3305 int split_flag,
3306 int flags)
3307{
Theodore Ts'odfe50802014-09-01 14:37:09 -04003308 struct ext4_ext_path *path = *ppath;
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003309 ext4_lblk_t ee_block;
3310 struct ext4_extent *ex;
3311 unsigned int ee_len, depth;
3312 int err = 0;
Lukas Czerner556615d2014-04-20 23:45:47 -04003313 int unwritten;
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003314 int split_flag1, flags1;
Zheng Liu3a225672013-03-10 21:20:23 -04003315 int allocated = map->m_len;
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003316
3317 depth = ext_depth(inode);
3318 ex = path[depth].p_ext;
3319 ee_block = le32_to_cpu(ex->ee_block);
3320 ee_len = ext4_ext_get_actual_len(ex);
Lukas Czerner556615d2014-04-20 23:45:47 -04003321 unwritten = ext4_ext_is_unwritten(ex);
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003322
3323 if (map->m_lblk + map->m_len < ee_block + ee_len) {
Dmitry Monakhovdee1f972012-10-10 01:04:58 -04003324 split_flag1 = split_flag & EXT4_EXT_MAY_ZEROOUT;
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003325 flags1 = flags | EXT4_GET_BLOCKS_PRE_IO;
Lukas Czerner556615d2014-04-20 23:45:47 -04003326 if (unwritten)
3327 split_flag1 |= EXT4_EXT_MARK_UNWRIT1 |
3328 EXT4_EXT_MARK_UNWRIT2;
Dmitry Monakhovdee1f972012-10-10 01:04:58 -04003329 if (split_flag & EXT4_EXT_DATA_VALID2)
3330 split_flag1 |= EXT4_EXT_DATA_VALID1;
Theodore Ts'odfe50802014-09-01 14:37:09 -04003331 err = ext4_split_extent_at(handle, inode, ppath,
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003332 map->m_lblk + map->m_len, split_flag1, flags1);
Yongqiang Yang93917412011-05-22 20:49:12 -04003333 if (err)
3334 goto out;
Zheng Liu3a225672013-03-10 21:20:23 -04003335 } else {
3336 allocated = ee_len - (map->m_lblk - ee_block);
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003337 }
Dmitry Monakhov357b66f2013-03-04 00:34:34 -05003338 /*
3339 * Update path is required because previous ext4_split_extent_at() may
3340 * result in split of original leaf or extent zeroout.
3341 */
Theodore Ts'oed8a1a72014-09-01 14:43:09 -04003342 path = ext4_find_extent(inode, map->m_lblk, ppath, 0);
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003343 if (IS_ERR(path))
3344 return PTR_ERR(path);
Dmitry Monakhov357b66f2013-03-04 00:34:34 -05003345 depth = ext_depth(inode);
3346 ex = path[depth].p_ext;
Dmitry Monakhova18ed352014-04-13 15:41:13 -04003347 if (!ex) {
3348 EXT4_ERROR_INODE(inode, "unexpected hole at %lu",
3349 (unsigned long) map->m_lblk);
3350 return -EIO;
3351 }
Lukas Czerner556615d2014-04-20 23:45:47 -04003352 unwritten = ext4_ext_is_unwritten(ex);
Dmitry Monakhov357b66f2013-03-04 00:34:34 -05003353 split_flag1 = 0;
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003354
3355 if (map->m_lblk >= ee_block) {
Dmitry Monakhov357b66f2013-03-04 00:34:34 -05003356 split_flag1 = split_flag & EXT4_EXT_DATA_VALID2;
Lukas Czerner556615d2014-04-20 23:45:47 -04003357 if (unwritten) {
3358 split_flag1 |= EXT4_EXT_MARK_UNWRIT1;
Dmitry Monakhov357b66f2013-03-04 00:34:34 -05003359 split_flag1 |= split_flag & (EXT4_EXT_MAY_ZEROOUT |
Lukas Czerner556615d2014-04-20 23:45:47 -04003360 EXT4_EXT_MARK_UNWRIT2);
Dmitry Monakhov357b66f2013-03-04 00:34:34 -05003361 }
Theodore Ts'odfe50802014-09-01 14:37:09 -04003362 err = ext4_split_extent_at(handle, inode, ppath,
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003363 map->m_lblk, split_flag1, flags);
3364 if (err)
3365 goto out;
3366 }
3367
3368 ext4_ext_show_leaf(inode, path);
3369out:
Zheng Liu3a225672013-03-10 21:20:23 -04003370 return err ? err : allocated;
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003371}
3372
Amit Arora56055d32007-07-17 21:42:38 -04003373/*
Theodore Ts'oe35fd662010-05-16 19:00:00 -04003374 * This function is called by ext4_ext_map_blocks() if someone tries to write
Lukas Czerner556615d2014-04-20 23:45:47 -04003375 * to an unwritten extent. It may result in splitting the unwritten
Lucas De Marchi25985ed2011-03-30 22:57:33 -03003376 * extent into multiple extents (up to three - one initialized and two
Lukas Czerner556615d2014-04-20 23:45:47 -04003377 * unwritten).
Amit Arora56055d32007-07-17 21:42:38 -04003378 * There are three possibilities:
3379 * a> There is no split required: Entire extent should be initialized
3380 * b> Splits in two extents: Write is happening at either end of the extent
3381 * c> Splits in three extents: Somone is writing in middle of the extent
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003382 *
3383 * Pre-conditions:
Lukas Czerner556615d2014-04-20 23:45:47 -04003384 * - The extent pointed to by 'path' is unwritten.
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003385 * - The extent pointed to by 'path' contains a superset
3386 * of the logical span [map->m_lblk, map->m_lblk + map->m_len).
3387 *
3388 * Post-conditions on success:
3389 * - the returned value is the number of blocks beyond map->l_lblk
3390 * that are allocated and initialized.
3391 * It is guaranteed to be >= map->m_len.
Amit Arora56055d32007-07-17 21:42:38 -04003392 */
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05003393static int ext4_ext_convert_to_initialized(handle_t *handle,
Theodore Ts'oe35fd662010-05-16 19:00:00 -04003394 struct inode *inode,
3395 struct ext4_map_blocks *map,
Theodore Ts'odfe50802014-09-01 14:37:09 -04003396 struct ext4_ext_path **ppath,
Lukas Czerner27dd4382013-04-09 22:11:22 -04003397 int flags)
Amit Arora56055d32007-07-17 21:42:38 -04003398{
Theodore Ts'odfe50802014-09-01 14:37:09 -04003399 struct ext4_ext_path *path = *ppath;
Zheng Liu67a5da52012-08-17 09:54:17 -04003400 struct ext4_sb_info *sbi;
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003401 struct ext4_extent_header *eh;
Yongqiang Yang667eff32011-05-03 12:25:07 -04003402 struct ext4_map_blocks split_map;
3403 struct ext4_extent zero_ex;
Lukas Czernerbc2d9db2013-04-03 23:33:27 -04003404 struct ext4_extent *ex, *abut_ex;
Dmitry Monakhov21ca0872010-05-16 06:00:00 -04003405 ext4_lblk_t ee_block, eof_block;
Lukas Czernerbc2d9db2013-04-03 23:33:27 -04003406 unsigned int ee_len, depth, map_len = map->m_len;
3407 int allocated = 0, max_zeroout = 0;
Amit Arora56055d32007-07-17 21:42:38 -04003408 int err = 0;
Yongqiang Yang667eff32011-05-03 12:25:07 -04003409 int split_flag = 0;
Dmitry Monakhov21ca0872010-05-16 06:00:00 -04003410
3411 ext_debug("ext4_ext_convert_to_initialized: inode %lu, logical"
3412 "block %llu, max_blocks %u\n", inode->i_ino,
Lukas Czernerbc2d9db2013-04-03 23:33:27 -04003413 (unsigned long long)map->m_lblk, map_len);
Dmitry Monakhov21ca0872010-05-16 06:00:00 -04003414
Zheng Liu67a5da52012-08-17 09:54:17 -04003415 sbi = EXT4_SB(inode->i_sb);
Dmitry Monakhov21ca0872010-05-16 06:00:00 -04003416 eof_block = (inode->i_size + inode->i_sb->s_blocksize - 1) >>
3417 inode->i_sb->s_blocksize_bits;
Lukas Czernerbc2d9db2013-04-03 23:33:27 -04003418 if (eof_block < map->m_lblk + map_len)
3419 eof_block = map->m_lblk + map_len;
Amit Arora56055d32007-07-17 21:42:38 -04003420
3421 depth = ext_depth(inode);
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003422 eh = path[depth].p_hdr;
Amit Arora56055d32007-07-17 21:42:38 -04003423 ex = path[depth].p_ext;
3424 ee_block = le32_to_cpu(ex->ee_block);
3425 ee_len = ext4_ext_get_actual_len(ex);
Zheng Liuadb23552013-03-10 21:13:05 -04003426 zero_ex.ee_len = 0;
Dmitry Monakhov21ca0872010-05-16 06:00:00 -04003427
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003428 trace_ext4_ext_convert_to_initialized_enter(inode, map, ex);
3429
3430 /* Pre-conditions */
Lukas Czerner556615d2014-04-20 23:45:47 -04003431 BUG_ON(!ext4_ext_is_unwritten(ex));
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003432 BUG_ON(!in_range(map->m_lblk, ee_block, ee_len));
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003433
3434 /*
3435 * Attempt to transfer newly initialized blocks from the currently
Lukas Czerner556615d2014-04-20 23:45:47 -04003436 * unwritten extent to its neighbor. This is much cheaper
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003437 * than an insertion followed by a merge as those involve costly
Lukas Czernerbc2d9db2013-04-03 23:33:27 -04003438 * memmove() calls. Transferring to the left is the common case in
3439 * steady state for workloads doing fallocate(FALLOC_FL_KEEP_SIZE)
3440 * followed by append writes.
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003441 *
3442 * Limitations of the current logic:
Lukas Czernerbc2d9db2013-04-03 23:33:27 -04003443 * - L1: we do not deal with writes covering the whole extent.
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003444 * This would require removing the extent if the transfer
3445 * is possible.
Lukas Czernerbc2d9db2013-04-03 23:33:27 -04003446 * - L2: we only attempt to merge with an extent stored in the
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003447 * same extent tree node.
3448 */
Lukas Czernerbc2d9db2013-04-03 23:33:27 -04003449 if ((map->m_lblk == ee_block) &&
3450 /* See if we can merge left */
3451 (map_len < ee_len) && /*L1*/
3452 (ex > EXT_FIRST_EXTENT(eh))) { /*L2*/
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003453 ext4_lblk_t prev_lblk;
3454 ext4_fsblk_t prev_pblk, ee_pblk;
Lukas Czernerbc2d9db2013-04-03 23:33:27 -04003455 unsigned int prev_len;
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003456
Lukas Czernerbc2d9db2013-04-03 23:33:27 -04003457 abut_ex = ex - 1;
3458 prev_lblk = le32_to_cpu(abut_ex->ee_block);
3459 prev_len = ext4_ext_get_actual_len(abut_ex);
3460 prev_pblk = ext4_ext_pblock(abut_ex);
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003461 ee_pblk = ext4_ext_pblock(ex);
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003462
3463 /*
Lukas Czernerbc2d9db2013-04-03 23:33:27 -04003464 * A transfer of blocks from 'ex' to 'abut_ex' is allowed
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003465 * upon those conditions:
Lukas Czernerbc2d9db2013-04-03 23:33:27 -04003466 * - C1: abut_ex is initialized,
3467 * - C2: abut_ex is logically abutting ex,
3468 * - C3: abut_ex is physically abutting ex,
3469 * - C4: abut_ex can receive the additional blocks without
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003470 * overflowing the (initialized) length limit.
3471 */
Lukas Czerner556615d2014-04-20 23:45:47 -04003472 if ((!ext4_ext_is_unwritten(abut_ex)) && /*C1*/
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003473 ((prev_lblk + prev_len) == ee_block) && /*C2*/
3474 ((prev_pblk + prev_len) == ee_pblk) && /*C3*/
Lukas Czernerbc2d9db2013-04-03 23:33:27 -04003475 (prev_len < (EXT_INIT_MAX_LEN - map_len))) { /*C4*/
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003476 err = ext4_ext_get_access(handle, inode, path + depth);
3477 if (err)
3478 goto out;
3479
3480 trace_ext4_ext_convert_to_initialized_fastpath(inode,
Lukas Czernerbc2d9db2013-04-03 23:33:27 -04003481 map, ex, abut_ex);
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003482
Lukas Czernerbc2d9db2013-04-03 23:33:27 -04003483 /* Shift the start of ex by 'map_len' blocks */
3484 ex->ee_block = cpu_to_le32(ee_block + map_len);
3485 ext4_ext_store_pblock(ex, ee_pblk + map_len);
3486 ex->ee_len = cpu_to_le16(ee_len - map_len);
Lukas Czerner556615d2014-04-20 23:45:47 -04003487 ext4_ext_mark_unwritten(ex); /* Restore the flag */
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003488
Lukas Czernerbc2d9db2013-04-03 23:33:27 -04003489 /* Extend abut_ex by 'map_len' blocks */
3490 abut_ex->ee_len = cpu_to_le16(prev_len + map_len);
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003491
3492 /* Result: number of initialized blocks past m_lblk */
Lukas Czernerbc2d9db2013-04-03 23:33:27 -04003493 allocated = map_len;
3494 }
3495 } else if (((map->m_lblk + map_len) == (ee_block + ee_len)) &&
3496 (map_len < ee_len) && /*L1*/
3497 ex < EXT_LAST_EXTENT(eh)) { /*L2*/
3498 /* See if we can merge right */
3499 ext4_lblk_t next_lblk;
3500 ext4_fsblk_t next_pblk, ee_pblk;
3501 unsigned int next_len;
3502
3503 abut_ex = ex + 1;
3504 next_lblk = le32_to_cpu(abut_ex->ee_block);
3505 next_len = ext4_ext_get_actual_len(abut_ex);
3506 next_pblk = ext4_ext_pblock(abut_ex);
3507 ee_pblk = ext4_ext_pblock(ex);
3508
3509 /*
3510 * A transfer of blocks from 'ex' to 'abut_ex' is allowed
3511 * upon those conditions:
3512 * - C1: abut_ex is initialized,
3513 * - C2: abut_ex is logically abutting ex,
3514 * - C3: abut_ex is physically abutting ex,
3515 * - C4: abut_ex can receive the additional blocks without
3516 * overflowing the (initialized) length limit.
3517 */
Lukas Czerner556615d2014-04-20 23:45:47 -04003518 if ((!ext4_ext_is_unwritten(abut_ex)) && /*C1*/
Lukas Czernerbc2d9db2013-04-03 23:33:27 -04003519 ((map->m_lblk + map_len) == next_lblk) && /*C2*/
3520 ((ee_pblk + ee_len) == next_pblk) && /*C3*/
3521 (next_len < (EXT_INIT_MAX_LEN - map_len))) { /*C4*/
3522 err = ext4_ext_get_access(handle, inode, path + depth);
3523 if (err)
3524 goto out;
3525
3526 trace_ext4_ext_convert_to_initialized_fastpath(inode,
3527 map, ex, abut_ex);
3528
3529 /* Shift the start of abut_ex by 'map_len' blocks */
3530 abut_ex->ee_block = cpu_to_le32(next_lblk - map_len);
3531 ext4_ext_store_pblock(abut_ex, next_pblk - map_len);
3532 ex->ee_len = cpu_to_le16(ee_len - map_len);
Lukas Czerner556615d2014-04-20 23:45:47 -04003533 ext4_ext_mark_unwritten(ex); /* Restore the flag */
Lukas Czernerbc2d9db2013-04-03 23:33:27 -04003534
3535 /* Extend abut_ex by 'map_len' blocks */
3536 abut_ex->ee_len = cpu_to_le16(next_len + map_len);
3537
3538 /* Result: number of initialized blocks past m_lblk */
3539 allocated = map_len;
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003540 }
3541 }
Lukas Czernerbc2d9db2013-04-03 23:33:27 -04003542 if (allocated) {
3543 /* Mark the block containing both extents as dirty */
3544 ext4_ext_dirty(handle, inode, path + depth);
3545
3546 /* Update path to point to the right extent */
3547 path[depth].p_ext = abut_ex;
3548 goto out;
3549 } else
3550 allocated = ee_len - (map->m_lblk - ee_block);
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003551
Yongqiang Yang667eff32011-05-03 12:25:07 -04003552 WARN_ON(map->m_lblk < ee_block);
Dmitry Monakhov21ca0872010-05-16 06:00:00 -04003553 /*
3554 * It is safe to convert extent to initialized via explicit
Yongqiang Yang9e740562014-01-06 14:05:23 -05003555 * zeroout only if extent is fully inside i_size or new_size.
Dmitry Monakhov21ca0872010-05-16 06:00:00 -04003556 */
Yongqiang Yang667eff32011-05-03 12:25:07 -04003557 split_flag |= ee_block + ee_len <= eof_block ? EXT4_EXT_MAY_ZEROOUT : 0;
Dmitry Monakhov21ca0872010-05-16 06:00:00 -04003558
Zheng Liu67a5da52012-08-17 09:54:17 -04003559 if (EXT4_EXT_MAY_ZEROOUT & split_flag)
3560 max_zeroout = sbi->s_extent_max_zeroout_kb >>
Lukas Czerner4f42f802013-03-12 12:40:04 -04003561 (inode->i_sb->s_blocksize_bits - 10);
Zheng Liu67a5da52012-08-17 09:54:17 -04003562
3563 /* If extent is less than s_max_zeroout_kb, zeroout directly */
3564 if (max_zeroout && (ee_len <= max_zeroout)) {
Yongqiang Yang667eff32011-05-03 12:25:07 -04003565 err = ext4_ext_zeroout(inode, ex);
Aneesh Kumar K.V3977c962008-04-17 10:38:59 -04003566 if (err)
Aneesh Kumar K.Vd03856b2008-08-02 18:51:32 -04003567 goto out;
Zheng Liuadb23552013-03-10 21:13:05 -04003568 zero_ex.ee_block = ex->ee_block;
Zheng Liu8cde7ad2013-04-03 12:27:18 -04003569 zero_ex.ee_len = cpu_to_le16(ext4_ext_get_actual_len(ex));
Zheng Liuadb23552013-03-10 21:13:05 -04003570 ext4_ext_store_pblock(&zero_ex, ext4_ext_pblock(ex));
Aneesh Kumar K.Vd03856b2008-08-02 18:51:32 -04003571
3572 err = ext4_ext_get_access(handle, inode, path + depth);
3573 if (err)
3574 goto out;
Yongqiang Yang667eff32011-05-03 12:25:07 -04003575 ext4_ext_mark_initialized(ex);
Theodore Ts'oecb94f52012-08-17 09:44:17 -04003576 ext4_ext_try_to_merge(handle, inode, path, ex);
3577 err = ext4_ext_dirty(handle, inode, path + path->p_depth);
Yongqiang Yang667eff32011-05-03 12:25:07 -04003578 goto out;
Amit Arora56055d32007-07-17 21:42:38 -04003579 }
Yongqiang Yang667eff32011-05-03 12:25:07 -04003580
Amit Arora56055d32007-07-17 21:42:38 -04003581 /*
Yongqiang Yang667eff32011-05-03 12:25:07 -04003582 * four cases:
3583 * 1. split the extent into three extents.
3584 * 2. split the extent into two extents, zeroout the first half.
3585 * 3. split the extent into two extents, zeroout the second half.
3586 * 4. split the extent into two extents with out zeroout.
Amit Arora56055d32007-07-17 21:42:38 -04003587 */
Yongqiang Yang667eff32011-05-03 12:25:07 -04003588 split_map.m_lblk = map->m_lblk;
3589 split_map.m_len = map->m_len;
3590
Zheng Liu67a5da52012-08-17 09:54:17 -04003591 if (max_zeroout && (allocated > map->m_len)) {
3592 if (allocated <= max_zeroout) {
Yongqiang Yang667eff32011-05-03 12:25:07 -04003593 /* case 3 */
3594 zero_ex.ee_block =
Allison Henderson9b940f82011-05-16 10:11:09 -04003595 cpu_to_le32(map->m_lblk);
3596 zero_ex.ee_len = cpu_to_le16(allocated);
Yongqiang Yang667eff32011-05-03 12:25:07 -04003597 ext4_ext_store_pblock(&zero_ex,
3598 ext4_ext_pblock(ex) + map->m_lblk - ee_block);
3599 err = ext4_ext_zeroout(inode, &zero_ex);
Amit Arora56055d32007-07-17 21:42:38 -04003600 if (err)
3601 goto out;
Yongqiang Yang667eff32011-05-03 12:25:07 -04003602 split_map.m_lblk = map->m_lblk;
3603 split_map.m_len = allocated;
Zheng Liu67a5da52012-08-17 09:54:17 -04003604 } else if (map->m_lblk - ee_block + map->m_len < max_zeroout) {
Yongqiang Yang667eff32011-05-03 12:25:07 -04003605 /* case 2 */
3606 if (map->m_lblk != ee_block) {
3607 zero_ex.ee_block = ex->ee_block;
3608 zero_ex.ee_len = cpu_to_le16(map->m_lblk -
3609 ee_block);
3610 ext4_ext_store_pblock(&zero_ex,
3611 ext4_ext_pblock(ex));
3612 err = ext4_ext_zeroout(inode, &zero_ex);
3613 if (err)
3614 goto out;
3615 }
3616
Yongqiang Yang667eff32011-05-03 12:25:07 -04003617 split_map.m_lblk = ee_block;
Allison Henderson9b940f82011-05-16 10:11:09 -04003618 split_map.m_len = map->m_lblk - ee_block + map->m_len;
3619 allocated = map->m_len;
Amit Arora56055d32007-07-17 21:42:38 -04003620 }
3621 }
Yongqiang Yang667eff32011-05-03 12:25:07 -04003622
Jan Karaae9e9c6a2014-10-30 10:53:17 -04003623 err = ext4_split_extent(handle, inode, ppath, &split_map, split_flag,
3624 flags);
3625 if (err > 0)
3626 err = 0;
Amit Arora56055d32007-07-17 21:42:38 -04003627out:
Zheng Liuadb23552013-03-10 21:13:05 -04003628 /* If we have gotten a failure, don't zero out status tree */
3629 if (!err)
Zheng Liud7b2a002013-08-28 14:47:06 -04003630 err = ext4_zeroout_es(inode, &zero_ex);
Amit Arora56055d32007-07-17 21:42:38 -04003631 return err ? err : allocated;
3632}
3633
Aneesh Kumar K.Vc278bfe2008-01-28 23:58:27 -05003634/*
Theodore Ts'oe35fd662010-05-16 19:00:00 -04003635 * This function is called by ext4_ext_map_blocks() from
Mingming Cao00314622009-09-28 15:49:08 -04003636 * ext4_get_blocks_dio_write() when DIO to write
Lukas Czerner556615d2014-04-20 23:45:47 -04003637 * to an unwritten extent.
Mingming Cao00314622009-09-28 15:49:08 -04003638 *
Lukas Czerner556615d2014-04-20 23:45:47 -04003639 * Writing to an unwritten extent may result in splitting the unwritten
3640 * extent into multiple initialized/unwritten extents (up to three)
Mingming Cao00314622009-09-28 15:49:08 -04003641 * There are three possibilities:
Lukas Czerner556615d2014-04-20 23:45:47 -04003642 * a> There is no split required: Entire extent should be unwritten
Mingming Cao00314622009-09-28 15:49:08 -04003643 * b> Splits in two extents: Write is happening at either end of the extent
3644 * c> Splits in three extents: Somone is writing in middle of the extent
3645 *
Lukas Czernerb8a86842014-03-18 18:05:35 -04003646 * This works the same way in the case of initialized -> unwritten conversion.
3647 *
Mingming Cao00314622009-09-28 15:49:08 -04003648 * One of more index blocks maybe needed if the extent tree grow after
Lukas Czerner556615d2014-04-20 23:45:47 -04003649 * the unwritten extent split. To prevent ENOSPC occur at the IO
3650 * complete, we need to split the unwritten extent before DIO submit
3651 * the IO. The unwritten extent called at this time will be split
3652 * into three unwritten extent(at most). After IO complete, the part
Mingming Cao00314622009-09-28 15:49:08 -04003653 * being filled will be convert to initialized by the end_io callback function
3654 * via ext4_convert_unwritten_extents().
Mingmingba230c32009-11-06 04:01:23 -05003655 *
Lukas Czerner556615d2014-04-20 23:45:47 -04003656 * Returns the size of unwritten extent to be written on success.
Mingming Cao00314622009-09-28 15:49:08 -04003657 */
Lukas Czernerb8a86842014-03-18 18:05:35 -04003658static int ext4_split_convert_extents(handle_t *handle,
Mingming Cao00314622009-09-28 15:49:08 -04003659 struct inode *inode,
Theodore Ts'oe35fd662010-05-16 19:00:00 -04003660 struct ext4_map_blocks *map,
Theodore Ts'odfe50802014-09-01 14:37:09 -04003661 struct ext4_ext_path **ppath,
Mingming Cao00314622009-09-28 15:49:08 -04003662 int flags)
3663{
Theodore Ts'odfe50802014-09-01 14:37:09 -04003664 struct ext4_ext_path *path = *ppath;
Yongqiang Yang667eff32011-05-03 12:25:07 -04003665 ext4_lblk_t eof_block;
3666 ext4_lblk_t ee_block;
3667 struct ext4_extent *ex;
3668 unsigned int ee_len;
3669 int split_flag = 0, depth;
Mingming Cao00314622009-09-28 15:49:08 -04003670
Lukas Czernerb8a86842014-03-18 18:05:35 -04003671 ext_debug("%s: inode %lu, logical block %llu, max_blocks %u\n",
3672 __func__, inode->i_ino,
3673 (unsigned long long)map->m_lblk, map->m_len);
Dmitry Monakhov21ca0872010-05-16 06:00:00 -04003674
3675 eof_block = (inode->i_size + inode->i_sb->s_blocksize - 1) >>
3676 inode->i_sb->s_blocksize_bits;
Theodore Ts'oe35fd662010-05-16 19:00:00 -04003677 if (eof_block < map->m_lblk + map->m_len)
3678 eof_block = map->m_lblk + map->m_len;
Mingming Cao00314622009-09-28 15:49:08 -04003679 /*
Dmitry Monakhov21ca0872010-05-16 06:00:00 -04003680 * It is safe to convert extent to initialized via explicit
3681 * zeroout only if extent is fully insde i_size or new_size.
3682 */
Yongqiang Yang667eff32011-05-03 12:25:07 -04003683 depth = ext_depth(inode);
3684 ex = path[depth].p_ext;
3685 ee_block = le32_to_cpu(ex->ee_block);
3686 ee_len = ext4_ext_get_actual_len(ex);
Dmitry Monakhov21ca0872010-05-16 06:00:00 -04003687
Lukas Czernerb8a86842014-03-18 18:05:35 -04003688 /* Convert to unwritten */
3689 if (flags & EXT4_GET_BLOCKS_CONVERT_UNWRITTEN) {
3690 split_flag |= EXT4_EXT_DATA_VALID1;
3691 /* Convert to initialized */
3692 } else if (flags & EXT4_GET_BLOCKS_CONVERT) {
3693 split_flag |= ee_block + ee_len <= eof_block ?
3694 EXT4_EXT_MAY_ZEROOUT : 0;
Lukas Czerner556615d2014-04-20 23:45:47 -04003695 split_flag |= (EXT4_EXT_MARK_UNWRIT2 | EXT4_EXT_DATA_VALID2);
Lukas Czernerb8a86842014-03-18 18:05:35 -04003696 }
Yongqiang Yang667eff32011-05-03 12:25:07 -04003697 flags |= EXT4_GET_BLOCKS_PRE_IO;
Theodore Ts'odfe50802014-09-01 14:37:09 -04003698 return ext4_split_extent(handle, inode, ppath, map, split_flag, flags);
Mingming Cao00314622009-09-28 15:49:08 -04003699}
Yongqiang Yang197217a2011-05-03 11:45:29 -04003700
Jiaying Zhangc7064ef2010-03-02 13:28:44 -05003701static int ext4_convert_unwritten_extents_endio(handle_t *handle,
Dmitry Monakhovdee1f972012-10-10 01:04:58 -04003702 struct inode *inode,
3703 struct ext4_map_blocks *map,
Theodore Ts'odfe50802014-09-01 14:37:09 -04003704 struct ext4_ext_path **ppath)
Mingming Cao00314622009-09-28 15:49:08 -04003705{
Theodore Ts'odfe50802014-09-01 14:37:09 -04003706 struct ext4_ext_path *path = *ppath;
Mingming Cao00314622009-09-28 15:49:08 -04003707 struct ext4_extent *ex;
Dmitry Monakhovdee1f972012-10-10 01:04:58 -04003708 ext4_lblk_t ee_block;
3709 unsigned int ee_len;
Mingming Cao00314622009-09-28 15:49:08 -04003710 int depth;
3711 int err = 0;
Mingming Cao00314622009-09-28 15:49:08 -04003712
3713 depth = ext_depth(inode);
Mingming Cao00314622009-09-28 15:49:08 -04003714 ex = path[depth].p_ext;
Dmitry Monakhovdee1f972012-10-10 01:04:58 -04003715 ee_block = le32_to_cpu(ex->ee_block);
3716 ee_len = ext4_ext_get_actual_len(ex);
Mingming Cao00314622009-09-28 15:49:08 -04003717
Yongqiang Yang197217a2011-05-03 11:45:29 -04003718 ext_debug("ext4_convert_unwritten_extents_endio: inode %lu, logical"
3719 "block %llu, max_blocks %u\n", inode->i_ino,
Dmitry Monakhovdee1f972012-10-10 01:04:58 -04003720 (unsigned long long)ee_block, ee_len);
3721
Dmitry Monakhovff95ec22013-03-04 00:41:05 -05003722 /* If extent is larger than requested it is a clear sign that we still
3723 * have some extent state machine issues left. So extent_split is still
3724 * required.
3725 * TODO: Once all related issues will be fixed this situation should be
3726 * illegal.
3727 */
Dmitry Monakhovdee1f972012-10-10 01:04:58 -04003728 if (ee_block != map->m_lblk || ee_len > map->m_len) {
Dmitry Monakhovff95ec22013-03-04 00:41:05 -05003729#ifdef EXT4_DEBUG
3730 ext4_warning("Inode (%ld) finished: extent logical block %llu,"
3731 " len %u; IO logical block %llu, len %u\n",
3732 inode->i_ino, (unsigned long long)ee_block, ee_len,
3733 (unsigned long long)map->m_lblk, map->m_len);
3734#endif
Theodore Ts'odfe50802014-09-01 14:37:09 -04003735 err = ext4_split_convert_extents(handle, inode, map, ppath,
Lukas Czernerb8a86842014-03-18 18:05:35 -04003736 EXT4_GET_BLOCKS_CONVERT);
Dmitry Monakhovdee1f972012-10-10 01:04:58 -04003737 if (err < 0)
Theodore Ts'odfe50802014-09-01 14:37:09 -04003738 return err;
Theodore Ts'oed8a1a72014-09-01 14:43:09 -04003739 path = ext4_find_extent(inode, map->m_lblk, ppath, 0);
Theodore Ts'odfe50802014-09-01 14:37:09 -04003740 if (IS_ERR(path))
3741 return PTR_ERR(path);
Dmitry Monakhovdee1f972012-10-10 01:04:58 -04003742 depth = ext_depth(inode);
3743 ex = path[depth].p_ext;
3744 }
Yongqiang Yang197217a2011-05-03 11:45:29 -04003745
Mingming Cao00314622009-09-28 15:49:08 -04003746 err = ext4_ext_get_access(handle, inode, path + depth);
3747 if (err)
3748 goto out;
3749 /* first mark the extent as initialized */
3750 ext4_ext_mark_initialized(ex);
3751
Yongqiang Yang197217a2011-05-03 11:45:29 -04003752 /* note: ext4_ext_correct_indexes() isn't needed here because
3753 * borders are not changed
Mingming Cao00314622009-09-28 15:49:08 -04003754 */
Theodore Ts'oecb94f52012-08-17 09:44:17 -04003755 ext4_ext_try_to_merge(handle, inode, path, ex);
Yongqiang Yang197217a2011-05-03 11:45:29 -04003756
Mingming Cao00314622009-09-28 15:49:08 -04003757 /* Mark modified extent as dirty */
Theodore Ts'oecb94f52012-08-17 09:44:17 -04003758 err = ext4_ext_dirty(handle, inode, path + path->p_depth);
Mingming Cao00314622009-09-28 15:49:08 -04003759out:
3760 ext4_ext_show_leaf(inode, path);
3761 return err;
3762}
3763
Aneesh Kumar K.V515f41c2009-12-29 23:39:06 -05003764static void unmap_underlying_metadata_blocks(struct block_device *bdev,
3765 sector_t block, int count)
3766{
3767 int i;
3768 for (i = 0; i < count; i++)
3769 unmap_underlying_metadata(bdev, block + i);
3770}
3771
Theodore Ts'o58590b02010-10-27 21:23:12 -04003772/*
3773 * Handle EOFBLOCKS_FL flag, clearing it if necessary
3774 */
3775static int check_eofblocks_fl(handle_t *handle, struct inode *inode,
Eric Sandeend002ebf2011-01-10 13:03:35 -05003776 ext4_lblk_t lblk,
Theodore Ts'o58590b02010-10-27 21:23:12 -04003777 struct ext4_ext_path *path,
3778 unsigned int len)
3779{
3780 int i, depth;
3781 struct ext4_extent_header *eh;
Sergey Senozhatsky65922cb2011-03-23 14:08:27 -04003782 struct ext4_extent *last_ex;
Theodore Ts'o58590b02010-10-27 21:23:12 -04003783
3784 if (!ext4_test_inode_flag(inode, EXT4_INODE_EOFBLOCKS))
3785 return 0;
3786
3787 depth = ext_depth(inode);
3788 eh = path[depth].p_hdr;
Theodore Ts'o58590b02010-10-27 21:23:12 -04003789
Lukas Czernerafcff5d2012-03-21 21:47:55 -04003790 /*
3791 * We're going to remove EOFBLOCKS_FL entirely in future so we
3792 * do not care for this case anymore. Simply remove the flag
3793 * if there are no extents.
3794 */
3795 if (unlikely(!eh->eh_entries))
3796 goto out;
Theodore Ts'o58590b02010-10-27 21:23:12 -04003797 last_ex = EXT_LAST_EXTENT(eh);
3798 /*
3799 * We should clear the EOFBLOCKS_FL flag if we are writing the
3800 * last block in the last extent in the file. We test this by
3801 * first checking to see if the caller to
3802 * ext4_ext_get_blocks() was interested in the last block (or
3803 * a block beyond the last block) in the current extent. If
3804 * this turns out to be false, we can bail out from this
3805 * function immediately.
3806 */
Eric Sandeend002ebf2011-01-10 13:03:35 -05003807 if (lblk + len < le32_to_cpu(last_ex->ee_block) +
Theodore Ts'o58590b02010-10-27 21:23:12 -04003808 ext4_ext_get_actual_len(last_ex))
3809 return 0;
3810 /*
3811 * If the caller does appear to be planning to write at or
3812 * beyond the end of the current extent, we then test to see
3813 * if the current extent is the last extent in the file, by
3814 * checking to make sure it was reached via the rightmost node
3815 * at each level of the tree.
3816 */
3817 for (i = depth-1; i >= 0; i--)
3818 if (path[i].p_idx != EXT_LAST_INDEX(path[i].p_hdr))
3819 return 0;
Lukas Czernerafcff5d2012-03-21 21:47:55 -04003820out:
Theodore Ts'o58590b02010-10-27 21:23:12 -04003821 ext4_clear_inode_flag(inode, EXT4_INODE_EOFBLOCKS);
3822 return ext4_mark_inode_dirty(handle, inode);
3823}
3824
Aditya Kali7b415bf2011-09-09 19:04:51 -04003825/**
3826 * ext4_find_delalloc_range: find delayed allocated block in the given range.
3827 *
Zheng Liu7d1b1fb2012-11-08 21:57:35 -05003828 * Return 1 if there is a delalloc block in the range, otherwise 0.
Aditya Kali7b415bf2011-09-09 19:04:51 -04003829 */
Zheng Liuf7fec032013-02-18 00:28:47 -05003830int ext4_find_delalloc_range(struct inode *inode,
3831 ext4_lblk_t lblk_start,
3832 ext4_lblk_t lblk_end)
Aditya Kali7b415bf2011-09-09 19:04:51 -04003833{
Zheng Liu7d1b1fb2012-11-08 21:57:35 -05003834 struct extent_status es;
Aditya Kali7b415bf2011-09-09 19:04:51 -04003835
Yan, Zhenge30b5dc2013-05-03 02:15:52 -04003836 ext4_es_find_delayed_extent_range(inode, lblk_start, lblk_end, &es);
Zheng Liu06b0c882013-02-18 00:26:51 -05003837 if (es.es_len == 0)
Zheng Liu7d1b1fb2012-11-08 21:57:35 -05003838 return 0; /* there is no delay extent in this tree */
Zheng Liu06b0c882013-02-18 00:26:51 -05003839 else if (es.es_lblk <= lblk_start &&
3840 lblk_start < es.es_lblk + es.es_len)
Zheng Liu7d1b1fb2012-11-08 21:57:35 -05003841 return 1;
Zheng Liu06b0c882013-02-18 00:26:51 -05003842 else if (lblk_start <= es.es_lblk && es.es_lblk <= lblk_end)
Zheng Liu7d1b1fb2012-11-08 21:57:35 -05003843 return 1;
Aditya Kali7b415bf2011-09-09 19:04:51 -04003844 else
Zheng Liu7d1b1fb2012-11-08 21:57:35 -05003845 return 0;
Aditya Kali7b415bf2011-09-09 19:04:51 -04003846}
3847
Zheng Liu7d1b1fb2012-11-08 21:57:35 -05003848int ext4_find_delalloc_cluster(struct inode *inode, ext4_lblk_t lblk)
Aditya Kali7b415bf2011-09-09 19:04:51 -04003849{
3850 struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
3851 ext4_lblk_t lblk_start, lblk_end;
Theodore Ts'of5a44db2013-12-20 09:29:35 -05003852 lblk_start = EXT4_LBLK_CMASK(sbi, lblk);
Aditya Kali7b415bf2011-09-09 19:04:51 -04003853 lblk_end = lblk_start + sbi->s_cluster_ratio - 1;
3854
Zheng Liu7d1b1fb2012-11-08 21:57:35 -05003855 return ext4_find_delalloc_range(inode, lblk_start, lblk_end);
Aditya Kali7b415bf2011-09-09 19:04:51 -04003856}
3857
3858/**
3859 * Determines how many complete clusters (out of those specified by the 'map')
3860 * are under delalloc and were reserved quota for.
3861 * This function is called when we are writing out the blocks that were
3862 * originally written with their allocation delayed, but then the space was
3863 * allocated using fallocate() before the delayed allocation could be resolved.
3864 * The cases to look for are:
3865 * ('=' indicated delayed allocated blocks
3866 * '-' indicates non-delayed allocated blocks)
3867 * (a) partial clusters towards beginning and/or end outside of allocated range
3868 * are not delalloc'ed.
3869 * Ex:
3870 * |----c---=|====c====|====c====|===-c----|
3871 * |++++++ allocated ++++++|
3872 * ==> 4 complete clusters in above example
3873 *
3874 * (b) partial cluster (outside of allocated range) towards either end is
3875 * marked for delayed allocation. In this case, we will exclude that
3876 * cluster.
3877 * Ex:
3878 * |----====c========|========c========|
3879 * |++++++ allocated ++++++|
3880 * ==> 1 complete clusters in above example
3881 *
3882 * Ex:
3883 * |================c================|
3884 * |++++++ allocated ++++++|
3885 * ==> 0 complete clusters in above example
3886 *
3887 * The ext4_da_update_reserve_space will be called only if we
3888 * determine here that there were some "entire" clusters that span
3889 * this 'allocated' range.
3890 * In the non-bigalloc case, this function will just end up returning num_blks
3891 * without ever calling ext4_find_delalloc_range.
3892 */
3893static unsigned int
3894get_reserved_cluster_alloc(struct inode *inode, ext4_lblk_t lblk_start,
3895 unsigned int num_blks)
3896{
3897 struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
3898 ext4_lblk_t alloc_cluster_start, alloc_cluster_end;
3899 ext4_lblk_t lblk_from, lblk_to, c_offset;
3900 unsigned int allocated_clusters = 0;
3901
3902 alloc_cluster_start = EXT4_B2C(sbi, lblk_start);
3903 alloc_cluster_end = EXT4_B2C(sbi, lblk_start + num_blks - 1);
3904
3905 /* max possible clusters for this allocation */
3906 allocated_clusters = alloc_cluster_end - alloc_cluster_start + 1;
3907
Aditya Kalid8990242011-09-09 19:18:51 -04003908 trace_ext4_get_reserved_cluster_alloc(inode, lblk_start, num_blks);
3909
Aditya Kali7b415bf2011-09-09 19:04:51 -04003910 /* Check towards left side */
Theodore Ts'of5a44db2013-12-20 09:29:35 -05003911 c_offset = EXT4_LBLK_COFF(sbi, lblk_start);
Aditya Kali7b415bf2011-09-09 19:04:51 -04003912 if (c_offset) {
Theodore Ts'of5a44db2013-12-20 09:29:35 -05003913 lblk_from = EXT4_LBLK_CMASK(sbi, lblk_start);
Aditya Kali7b415bf2011-09-09 19:04:51 -04003914 lblk_to = lblk_from + c_offset - 1;
3915
Zheng Liu7d1b1fb2012-11-08 21:57:35 -05003916 if (ext4_find_delalloc_range(inode, lblk_from, lblk_to))
Aditya Kali7b415bf2011-09-09 19:04:51 -04003917 allocated_clusters--;
3918 }
3919
3920 /* Now check towards right. */
Theodore Ts'of5a44db2013-12-20 09:29:35 -05003921 c_offset = EXT4_LBLK_COFF(sbi, lblk_start + num_blks);
Aditya Kali7b415bf2011-09-09 19:04:51 -04003922 if (allocated_clusters && c_offset) {
3923 lblk_from = lblk_start + num_blks;
3924 lblk_to = lblk_from + (sbi->s_cluster_ratio - c_offset) - 1;
3925
Zheng Liu7d1b1fb2012-11-08 21:57:35 -05003926 if (ext4_find_delalloc_range(inode, lblk_from, lblk_to))
Aditya Kali7b415bf2011-09-09 19:04:51 -04003927 allocated_clusters--;
3928 }
3929
3930 return allocated_clusters;
3931}
3932
Mingming Cao00314622009-09-28 15:49:08 -04003933static int
Theodore Ts'oe8b83d932014-09-01 14:35:09 -04003934convert_initialized_extent(handle_t *handle, struct inode *inode,
3935 struct ext4_map_blocks *map,
Theodore Ts'o4f224b82014-09-01 14:36:09 -04003936 struct ext4_ext_path **ppath, int flags,
Theodore Ts'oe8b83d932014-09-01 14:35:09 -04003937 unsigned int allocated, ext4_fsblk_t newblock)
Lukas Czernerb8a86842014-03-18 18:05:35 -04003938{
Theodore Ts'o4f224b82014-09-01 14:36:09 -04003939 struct ext4_ext_path *path = *ppath;
Theodore Ts'oe8b83d932014-09-01 14:35:09 -04003940 struct ext4_extent *ex;
3941 ext4_lblk_t ee_block;
3942 unsigned int ee_len;
3943 int depth;
Lukas Czernerb8a86842014-03-18 18:05:35 -04003944 int err = 0;
3945
3946 /*
3947 * Make sure that the extent is no bigger than we support with
Lukas Czerner556615d2014-04-20 23:45:47 -04003948 * unwritten extent
Lukas Czernerb8a86842014-03-18 18:05:35 -04003949 */
Lukas Czerner556615d2014-04-20 23:45:47 -04003950 if (map->m_len > EXT_UNWRITTEN_MAX_LEN)
3951 map->m_len = EXT_UNWRITTEN_MAX_LEN / 2;
Lukas Czernerb8a86842014-03-18 18:05:35 -04003952
Theodore Ts'oe8b83d932014-09-01 14:35:09 -04003953 depth = ext_depth(inode);
3954 ex = path[depth].p_ext;
3955 ee_block = le32_to_cpu(ex->ee_block);
3956 ee_len = ext4_ext_get_actual_len(ex);
3957
3958 ext_debug("%s: inode %lu, logical"
3959 "block %llu, max_blocks %u\n", __func__, inode->i_ino,
3960 (unsigned long long)ee_block, ee_len);
3961
3962 if (ee_block != map->m_lblk || ee_len > map->m_len) {
Theodore Ts'odfe50802014-09-01 14:37:09 -04003963 err = ext4_split_convert_extents(handle, inode, map, ppath,
Theodore Ts'oe8b83d932014-09-01 14:35:09 -04003964 EXT4_GET_BLOCKS_CONVERT_UNWRITTEN);
3965 if (err < 0)
3966 return err;
Theodore Ts'oed8a1a72014-09-01 14:43:09 -04003967 path = ext4_find_extent(inode, map->m_lblk, ppath, 0);
Theodore Ts'oe8b83d932014-09-01 14:35:09 -04003968 if (IS_ERR(path))
3969 return PTR_ERR(path);
3970 depth = ext_depth(inode);
3971 ex = path[depth].p_ext;
3972 if (!ex) {
3973 EXT4_ERROR_INODE(inode, "unexpected hole at %lu",
3974 (unsigned long) map->m_lblk);
3975 return -EIO;
3976 }
3977 }
3978
3979 err = ext4_ext_get_access(handle, inode, path + depth);
3980 if (err)
3981 return err;
3982 /* first mark the extent as unwritten */
3983 ext4_ext_mark_unwritten(ex);
3984
3985 /* note: ext4_ext_correct_indexes() isn't needed here because
3986 * borders are not changed
3987 */
3988 ext4_ext_try_to_merge(handle, inode, path, ex);
3989
3990 /* Mark modified extent as dirty */
3991 err = ext4_ext_dirty(handle, inode, path + path->p_depth);
3992 if (err)
3993 return err;
3994 ext4_ext_show_leaf(inode, path);
3995
3996 ext4_update_inode_fsync_trans(handle, inode, 1);
3997 err = check_eofblocks_fl(handle, inode, map->m_lblk, path, map->m_len);
3998 if (err)
3999 return err;
Lukas Czernerb8a86842014-03-18 18:05:35 -04004000 map->m_flags |= EXT4_MAP_UNWRITTEN;
4001 if (allocated > map->m_len)
4002 allocated = map->m_len;
4003 map->m_len = allocated;
Theodore Ts'oe8b83d932014-09-01 14:35:09 -04004004 return allocated;
Lukas Czernerb8a86842014-03-18 18:05:35 -04004005}
4006
4007static int
Lukas Czerner556615d2014-04-20 23:45:47 -04004008ext4_ext_handle_unwritten_extents(handle_t *handle, struct inode *inode,
Theodore Ts'oe35fd662010-05-16 19:00:00 -04004009 struct ext4_map_blocks *map,
Theodore Ts'odfe50802014-09-01 14:37:09 -04004010 struct ext4_ext_path **ppath, int flags,
Theodore Ts'oe35fd662010-05-16 19:00:00 -04004011 unsigned int allocated, ext4_fsblk_t newblock)
Mingming Cao00314622009-09-28 15:49:08 -04004012{
Theodore Ts'odfe50802014-09-01 14:37:09 -04004013 struct ext4_ext_path *path = *ppath;
Mingming Cao00314622009-09-28 15:49:08 -04004014 int ret = 0;
4015 int err = 0;
Dmitry Monakhovf45ee3a2012-09-28 23:21:09 -04004016 ext4_io_end_t *io = ext4_inode_aio(inode);
Mingming Cao00314622009-09-28 15:49:08 -04004017
Lukas Czerner556615d2014-04-20 23:45:47 -04004018 ext_debug("ext4_ext_handle_unwritten_extents: inode %lu, logical "
Zheng Liu88635ca2011-12-28 19:00:25 -05004019 "block %llu, max_blocks %u, flags %x, allocated %u\n",
Theodore Ts'oe35fd662010-05-16 19:00:00 -04004020 inode->i_ino, (unsigned long long)map->m_lblk, map->m_len,
Mingming Cao00314622009-09-28 15:49:08 -04004021 flags, allocated);
4022 ext4_ext_show_leaf(inode, path);
4023
Lukas Czerner27dd4382013-04-09 22:11:22 -04004024 /*
Lukas Czerner556615d2014-04-20 23:45:47 -04004025 * When writing into unwritten space, we should not fail to
Lukas Czerner27dd4382013-04-09 22:11:22 -04004026 * allocate metadata blocks for the new extent block if needed.
4027 */
4028 flags |= EXT4_GET_BLOCKS_METADATA_NOFAIL;
4029
Lukas Czerner556615d2014-04-20 23:45:47 -04004030 trace_ext4_ext_handle_unwritten_extents(inode, map, flags,
Zheng Liub5645532012-11-08 14:33:43 -05004031 allocated, newblock);
Aditya Kalid8990242011-09-09 19:18:51 -04004032
Jiaying Zhangc7064ef2010-03-02 13:28:44 -05004033 /* get_block() before submit the IO, split the extent */
Lukas Czernerc8b459f2014-05-12 12:55:07 -04004034 if (flags & EXT4_GET_BLOCKS_PRE_IO) {
Theodore Ts'odfe50802014-09-01 14:37:09 -04004035 ret = ext4_split_convert_extents(handle, inode, map, ppath,
4036 flags | EXT4_GET_BLOCKS_CONVERT);
Dmitry Monakhov82e54222012-09-28 23:36:25 -04004037 if (ret <= 0)
4038 goto out;
Mingming5f524952009-11-10 10:48:04 -05004039 /*
4040 * Flag the inode(non aio case) or end_io struct (aio case)
Lucas De Marchi25985ed2011-03-30 22:57:33 -03004041 * that this IO needs to conversion to written when IO is
Mingming5f524952009-11-10 10:48:04 -05004042 * completed
4043 */
Tao Ma0edeb712011-10-31 17:30:44 -04004044 if (io)
4045 ext4_set_io_unwritten_flag(inode, io);
4046 else
Theodore Ts'o19f5fb72010-01-24 14:34:07 -05004047 ext4_set_inode_state(inode, EXT4_STATE_DIO_UNWRITTEN);
Zheng Liua25a4e12013-02-18 00:28:04 -05004048 map->m_flags |= EXT4_MAP_UNWRITTEN;
Mingming Cao00314622009-09-28 15:49:08 -04004049 goto out;
4050 }
Jiaying Zhangc7064ef2010-03-02 13:28:44 -05004051 /* IO end_io complete, convert the filled extent to written */
Lukas Czernerc8b459f2014-05-12 12:55:07 -04004052 if (flags & EXT4_GET_BLOCKS_CONVERT) {
Dmitry Monakhovdee1f972012-10-10 01:04:58 -04004053 ret = ext4_convert_unwritten_extents_endio(handle, inode, map,
Theodore Ts'odfe50802014-09-01 14:37:09 -04004054 ppath);
Theodore Ts'o58590b02010-10-27 21:23:12 -04004055 if (ret >= 0) {
Jan Karab436b9b2009-12-08 23:51:10 -05004056 ext4_update_inode_fsync_trans(handle, inode, 1);
Eric Sandeend002ebf2011-01-10 13:03:35 -05004057 err = check_eofblocks_fl(handle, inode, map->m_lblk,
4058 path, map->m_len);
Theodore Ts'o58590b02010-10-27 21:23:12 -04004059 } else
4060 err = ret;
Zheng Liucdee7842013-03-10 21:08:52 -04004061 map->m_flags |= EXT4_MAP_MAPPED;
Eric Whitney15cc1762014-02-12 10:42:45 -05004062 map->m_pblk = newblock;
Zheng Liucdee7842013-03-10 21:08:52 -04004063 if (allocated > map->m_len)
4064 allocated = map->m_len;
4065 map->m_len = allocated;
Mingming Cao00314622009-09-28 15:49:08 -04004066 goto out2;
4067 }
4068 /* buffered IO case */
4069 /*
4070 * repeat fallocate creation request
4071 * we already have an unwritten extent
4072 */
Lukas Czerner556615d2014-04-20 23:45:47 -04004073 if (flags & EXT4_GET_BLOCKS_UNWRIT_EXT) {
Zheng Liua25a4e12013-02-18 00:28:04 -05004074 map->m_flags |= EXT4_MAP_UNWRITTEN;
Mingming Cao00314622009-09-28 15:49:08 -04004075 goto map_out;
Zheng Liua25a4e12013-02-18 00:28:04 -05004076 }
Mingming Cao00314622009-09-28 15:49:08 -04004077
4078 /* buffered READ or buffered write_begin() lookup */
4079 if ((flags & EXT4_GET_BLOCKS_CREATE) == 0) {
4080 /*
4081 * We have blocks reserved already. We
4082 * return allocated blocks so that delalloc
4083 * won't do block reservation for us. But
4084 * the buffer head will be unmapped so that
4085 * a read from the block returns 0s.
4086 */
Theodore Ts'oe35fd662010-05-16 19:00:00 -04004087 map->m_flags |= EXT4_MAP_UNWRITTEN;
Mingming Cao00314622009-09-28 15:49:08 -04004088 goto out1;
4089 }
4090
4091 /* buffered write, writepage time, convert*/
Theodore Ts'odfe50802014-09-01 14:37:09 -04004092 ret = ext4_ext_convert_to_initialized(handle, inode, map, ppath, flags);
Dmitry Monakhova4e5d882011-10-25 08:15:12 -04004093 if (ret >= 0)
Jan Karab436b9b2009-12-08 23:51:10 -05004094 ext4_update_inode_fsync_trans(handle, inode, 1);
Mingming Cao00314622009-09-28 15:49:08 -04004095out:
4096 if (ret <= 0) {
4097 err = ret;
4098 goto out2;
4099 } else
4100 allocated = ret;
Theodore Ts'oe35fd662010-05-16 19:00:00 -04004101 map->m_flags |= EXT4_MAP_NEW;
Aneesh Kumar K.V515f41c2009-12-29 23:39:06 -05004102 /*
4103 * if we allocated more blocks than requested
4104 * we need to make sure we unmap the extra block
4105 * allocated. The actual needed block will get
4106 * unmapped later when we find the buffer_head marked
4107 * new.
4108 */
Theodore Ts'oe35fd662010-05-16 19:00:00 -04004109 if (allocated > map->m_len) {
Aneesh Kumar K.V515f41c2009-12-29 23:39:06 -05004110 unmap_underlying_metadata_blocks(inode->i_sb->s_bdev,
Theodore Ts'oe35fd662010-05-16 19:00:00 -04004111 newblock + map->m_len,
4112 allocated - map->m_len);
4113 allocated = map->m_len;
Aneesh Kumar K.V515f41c2009-12-29 23:39:06 -05004114 }
Zheng Liu3a225672013-03-10 21:20:23 -04004115 map->m_len = allocated;
Aneesh Kumar K.V5f634d02010-01-25 04:00:31 -05004116
4117 /*
4118 * If we have done fallocate with the offset that is already
4119 * delayed allocated, we would have block reservation
4120 * and quota reservation done in the delayed write path.
4121 * But fallocate would have already updated quota and block
4122 * count for this offset. So cancel these reservation
4123 */
Aditya Kali7b415bf2011-09-09 19:04:51 -04004124 if (flags & EXT4_GET_BLOCKS_DELALLOC_RESERVE) {
4125 unsigned int reserved_clusters;
4126 reserved_clusters = get_reserved_cluster_alloc(inode,
4127 map->m_lblk, map->m_len);
4128 if (reserved_clusters)
4129 ext4_da_update_reserve_space(inode,
4130 reserved_clusters,
4131 0);
4132 }
Aneesh Kumar K.V5f634d02010-01-25 04:00:31 -05004133
Mingming Cao00314622009-09-28 15:49:08 -04004134map_out:
Theodore Ts'oe35fd662010-05-16 19:00:00 -04004135 map->m_flags |= EXT4_MAP_MAPPED;
Dmitry Monakhova4e5d882011-10-25 08:15:12 -04004136 if ((flags & EXT4_GET_BLOCKS_KEEP_SIZE) == 0) {
4137 err = check_eofblocks_fl(handle, inode, map->m_lblk, path,
4138 map->m_len);
4139 if (err < 0)
4140 goto out2;
4141 }
Mingming Cao00314622009-09-28 15:49:08 -04004142out1:
Theodore Ts'oe35fd662010-05-16 19:00:00 -04004143 if (allocated > map->m_len)
4144 allocated = map->m_len;
Mingming Cao00314622009-09-28 15:49:08 -04004145 ext4_ext_show_leaf(inode, path);
Theodore Ts'oe35fd662010-05-16 19:00:00 -04004146 map->m_pblk = newblock;
4147 map->m_len = allocated;
Mingming Cao00314622009-09-28 15:49:08 -04004148out2:
Mingming Cao00314622009-09-28 15:49:08 -04004149 return err ? err : allocated;
4150}
Theodore Ts'o58590b02010-10-27 21:23:12 -04004151
Mingming Cao00314622009-09-28 15:49:08 -04004152/*
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004153 * get_implied_cluster_alloc - check to see if the requested
4154 * allocation (in the map structure) overlaps with a cluster already
4155 * allocated in an extent.
Aditya Kalid8990242011-09-09 19:18:51 -04004156 * @sb The filesystem superblock structure
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004157 * @map The requested lblk->pblk mapping
4158 * @ex The extent structure which might contain an implied
4159 * cluster allocation
4160 *
4161 * This function is called by ext4_ext_map_blocks() after we failed to
4162 * find blocks that were already in the inode's extent tree. Hence,
4163 * we know that the beginning of the requested region cannot overlap
4164 * the extent from the inode's extent tree. There are three cases we
4165 * want to catch. The first is this case:
4166 *
4167 * |--- cluster # N--|
4168 * |--- extent ---| |---- requested region ---|
4169 * |==========|
4170 *
4171 * The second case that we need to test for is this one:
4172 *
4173 * |--------- cluster # N ----------------|
4174 * |--- requested region --| |------- extent ----|
4175 * |=======================|
4176 *
4177 * The third case is when the requested region lies between two extents
4178 * within the same cluster:
4179 * |------------- cluster # N-------------|
4180 * |----- ex -----| |---- ex_right ----|
4181 * |------ requested region ------|
4182 * |================|
4183 *
4184 * In each of the above cases, we need to set the map->m_pblk and
4185 * map->m_len so it corresponds to the return the extent labelled as
4186 * "|====|" from cluster #N, since it is already in use for data in
4187 * cluster EXT4_B2C(sbi, map->m_lblk). We will then return 1 to
4188 * signal to ext4_ext_map_blocks() that map->m_pblk should be treated
4189 * as a new "allocated" block region. Otherwise, we will return 0 and
4190 * ext4_ext_map_blocks() will then allocate one or more new clusters
4191 * by calling ext4_mb_new_blocks().
4192 */
Aditya Kalid8990242011-09-09 19:18:51 -04004193static int get_implied_cluster_alloc(struct super_block *sb,
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004194 struct ext4_map_blocks *map,
4195 struct ext4_extent *ex,
4196 struct ext4_ext_path *path)
4197{
Aditya Kalid8990242011-09-09 19:18:51 -04004198 struct ext4_sb_info *sbi = EXT4_SB(sb);
Theodore Ts'of5a44db2013-12-20 09:29:35 -05004199 ext4_lblk_t c_offset = EXT4_LBLK_COFF(sbi, map->m_lblk);
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004200 ext4_lblk_t ex_cluster_start, ex_cluster_end;
Curt Wohlgemuth14d7f3e2011-12-18 17:39:02 -05004201 ext4_lblk_t rr_cluster_start;
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004202 ext4_lblk_t ee_block = le32_to_cpu(ex->ee_block);
4203 ext4_fsblk_t ee_start = ext4_ext_pblock(ex);
4204 unsigned short ee_len = ext4_ext_get_actual_len(ex);
4205
4206 /* The extent passed in that we are trying to match */
4207 ex_cluster_start = EXT4_B2C(sbi, ee_block);
4208 ex_cluster_end = EXT4_B2C(sbi, ee_block + ee_len - 1);
4209
4210 /* The requested region passed into ext4_map_blocks() */
4211 rr_cluster_start = EXT4_B2C(sbi, map->m_lblk);
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004212
4213 if ((rr_cluster_start == ex_cluster_end) ||
4214 (rr_cluster_start == ex_cluster_start)) {
4215 if (rr_cluster_start == ex_cluster_end)
4216 ee_start += ee_len - 1;
Theodore Ts'of5a44db2013-12-20 09:29:35 -05004217 map->m_pblk = EXT4_PBLK_CMASK(sbi, ee_start) + c_offset;
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004218 map->m_len = min(map->m_len,
4219 (unsigned) sbi->s_cluster_ratio - c_offset);
4220 /*
4221 * Check for and handle this case:
4222 *
4223 * |--------- cluster # N-------------|
4224 * |------- extent ----|
4225 * |--- requested region ---|
4226 * |===========|
4227 */
4228
4229 if (map->m_lblk < ee_block)
4230 map->m_len = min(map->m_len, ee_block - map->m_lblk);
4231
4232 /*
4233 * Check for the case where there is already another allocated
4234 * block to the right of 'ex' but before the end of the cluster.
4235 *
4236 * |------------- cluster # N-------------|
4237 * |----- ex -----| |---- ex_right ----|
4238 * |------ requested region ------|
4239 * |================|
4240 */
4241 if (map->m_lblk > ee_block) {
4242 ext4_lblk_t next = ext4_ext_next_allocated_block(path);
4243 map->m_len = min(map->m_len, next - map->m_lblk);
4244 }
Aditya Kalid8990242011-09-09 19:18:51 -04004245
4246 trace_ext4_get_implied_cluster_alloc_exit(sb, map, 1);
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004247 return 1;
4248 }
Aditya Kalid8990242011-09-09 19:18:51 -04004249
4250 trace_ext4_get_implied_cluster_alloc_exit(sb, map, 0);
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004251 return 0;
4252}
4253
4254
4255/*
Mingming Caof5ab0d12008-02-25 15:29:55 -05004256 * Block allocation/map/preallocation routine for extents based files
4257 *
4258 *
Aneesh Kumar K.Vc278bfe2008-01-28 23:58:27 -05004259 * Need to be called with
Aneesh Kumar K.V0e855ac2008-01-28 23:58:26 -05004260 * down_read(&EXT4_I(inode)->i_data_sem) if not allocating file system block
4261 * (ie, create is zero). Otherwise down_write(&EXT4_I(inode)->i_data_sem)
Mingming Caof5ab0d12008-02-25 15:29:55 -05004262 *
4263 * return > 0, number of of blocks already mapped/allocated
4264 * if create == 0 and these are pre-allocated blocks
4265 * buffer head is unmapped
4266 * otherwise blocks are mapped
4267 *
4268 * return = 0, if plain look up failed (blocks have not been allocated)
4269 * buffer head is unmapped
4270 *
4271 * return < 0, error case.
Aneesh Kumar K.Vc278bfe2008-01-28 23:58:27 -05004272 */
Theodore Ts'oe35fd662010-05-16 19:00:00 -04004273int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
4274 struct ext4_map_blocks *map, int flags)
Alex Tomasa86c6182006-10-11 01:21:03 -07004275{
4276 struct ext4_ext_path *path = NULL;
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004277 struct ext4_extent newex, *ex, *ex2;
4278 struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
Jiaying Zhang0562e0b2011-03-21 21:38:05 -04004279 ext4_fsblk_t newblock = 0;
Eric Whitneyce37c422014-02-19 18:52:39 -05004280 int free_on_err = 0, err = 0, depth, ret;
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004281 unsigned int allocated = 0, offset = 0;
Yongqiang Yang81fdbb42011-10-29 09:23:38 -04004282 unsigned int allocated_clusters = 0;
Alex Tomasc9de5602008-01-29 00:19:52 -05004283 struct ext4_allocation_request ar;
Dmitry Monakhovf45ee3a2012-09-28 23:21:09 -04004284 ext4_io_end_t *io = ext4_inode_aio(inode);
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004285 ext4_lblk_t cluster_offset;
Dmitry Monakhov82e54222012-09-28 23:36:25 -04004286 int set_unwritten = 0;
Jan Karacbd75842014-11-25 11:41:49 -05004287 bool map_from_cluster = false;
Alex Tomasa86c6182006-10-11 01:21:03 -07004288
Mingming84fe3be2009-09-01 08:44:37 -04004289 ext_debug("blocks %u/%u requested for inode %lu\n",
Theodore Ts'oe35fd662010-05-16 19:00:00 -04004290 map->m_lblk, map->m_len, inode->i_ino);
Jiaying Zhang0562e0b2011-03-21 21:38:05 -04004291 trace_ext4_ext_map_blocks_enter(inode, map->m_lblk, map->m_len, flags);
Alex Tomasa86c6182006-10-11 01:21:03 -07004292
Alex Tomasa86c6182006-10-11 01:21:03 -07004293 /* find extent for this block */
Theodore Ts'oed8a1a72014-09-01 14:43:09 -04004294 path = ext4_find_extent(inode, map->m_lblk, NULL, 0);
Alex Tomasa86c6182006-10-11 01:21:03 -07004295 if (IS_ERR(path)) {
4296 err = PTR_ERR(path);
4297 path = NULL;
4298 goto out2;
4299 }
4300
4301 depth = ext_depth(inode);
4302
4303 /*
Randy Dunlapd0d856e2006-10-11 01:21:07 -07004304 * consistent leaf must not be empty;
4305 * this situation is possible, though, _during_ tree modification;
Theodore Ts'oed8a1a72014-09-01 14:43:09 -04004306 * this is why assert can't be put in ext4_find_extent()
Alex Tomasa86c6182006-10-11 01:21:03 -07004307 */
Frank Mayhar273df552010-03-02 11:46:09 -05004308 if (unlikely(path[depth].p_ext == NULL && depth != 0)) {
4309 EXT4_ERROR_INODE(inode, "bad extent address "
Theodore Ts'of70f3622010-05-16 23:00:00 -04004310 "lblock: %lu, depth: %d pblock %lld",
4311 (unsigned long) map->m_lblk, depth,
4312 path[depth].p_block);
Surbhi Palande034fb4c2009-12-14 09:53:52 -05004313 err = -EIO;
4314 goto out2;
4315 }
Alex Tomasa86c6182006-10-11 01:21:03 -07004316
Avantika Mathur7e028972006-12-06 20:41:33 -08004317 ex = path[depth].p_ext;
4318 if (ex) {
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05004319 ext4_lblk_t ee_block = le32_to_cpu(ex->ee_block);
Theodore Ts'obf89d162010-10-27 21:30:14 -04004320 ext4_fsblk_t ee_start = ext4_ext_pblock(ex);
Amit Aroraa2df2a62007-07-17 21:42:41 -04004321 unsigned short ee_len;
Suparna Bhattacharya471d4012006-10-11 01:21:06 -07004322
Lukas Czernerb8a86842014-03-18 18:05:35 -04004323
Suparna Bhattacharya471d4012006-10-11 01:21:06 -07004324 /*
Lukas Czerner556615d2014-04-20 23:45:47 -04004325 * unwritten extents are treated as holes, except that
Amit Arora56055d32007-07-17 21:42:38 -04004326 * we split out initialized portions during a write.
Suparna Bhattacharya471d4012006-10-11 01:21:06 -07004327 */
Amit Aroraa2df2a62007-07-17 21:42:41 -04004328 ee_len = ext4_ext_get_actual_len(ex);
Aditya Kalid8990242011-09-09 19:18:51 -04004329
4330 trace_ext4_ext_show_extent(inode, ee_block, ee_start, ee_len);
4331
Randy Dunlapd0d856e2006-10-11 01:21:07 -07004332 /* if found extent covers block, simply return it */
Theodore Ts'oe35fd662010-05-16 19:00:00 -04004333 if (in_range(map->m_lblk, ee_block, ee_len)) {
4334 newblock = map->m_lblk - ee_block + ee_start;
Randy Dunlapd0d856e2006-10-11 01:21:07 -07004335 /* number of remaining blocks in the extent */
Theodore Ts'oe35fd662010-05-16 19:00:00 -04004336 allocated = ee_len - (map->m_lblk - ee_block);
4337 ext_debug("%u fit into %u:%d -> %llu\n", map->m_lblk,
4338 ee_block, ee_len, newblock);
Amit Arora56055d32007-07-17 21:42:38 -04004339
Lukas Czernerb8a86842014-03-18 18:05:35 -04004340 /*
4341 * If the extent is initialized check whether the
4342 * caller wants to convert it to unwritten.
4343 */
Lukas Czerner556615d2014-04-20 23:45:47 -04004344 if ((!ext4_ext_is_unwritten(ex)) &&
Lukas Czernerb8a86842014-03-18 18:05:35 -04004345 (flags & EXT4_GET_BLOCKS_CONVERT_UNWRITTEN)) {
Theodore Ts'oe8b83d932014-09-01 14:35:09 -04004346 allocated = convert_initialized_extent(
Theodore Ts'o4f224b82014-09-01 14:36:09 -04004347 handle, inode, map, &path,
4348 flags, allocated, newblock);
Lukas Czernerb8a86842014-03-18 18:05:35 -04004349 goto out2;
Lukas Czerner556615d2014-04-20 23:45:47 -04004350 } else if (!ext4_ext_is_unwritten(ex))
Lukas Czerner78771912012-03-19 23:05:43 -04004351 goto out;
Zheng Liu69eb33d2013-02-18 00:31:07 -05004352
Lukas Czerner556615d2014-04-20 23:45:47 -04004353 ret = ext4_ext_handle_unwritten_extents(
Theodore Ts'odfe50802014-09-01 14:37:09 -04004354 handle, inode, map, &path, flags,
Lukas Czerner78771912012-03-19 23:05:43 -04004355 allocated, newblock);
Eric Whitneyce37c422014-02-19 18:52:39 -05004356 if (ret < 0)
4357 err = ret;
4358 else
4359 allocated = ret;
Eric Whitney31cf0f22014-03-13 23:14:46 -04004360 goto out2;
Alex Tomasa86c6182006-10-11 01:21:03 -07004361 }
4362 }
4363
4364 /*
Randy Dunlapd0d856e2006-10-11 01:21:07 -07004365 * requested block isn't allocated yet;
Alex Tomasa86c6182006-10-11 01:21:03 -07004366 * we couldn't try to create block if create flag is zero
4367 */
Theodore Ts'oc2177052009-05-14 00:58:52 -04004368 if ((flags & EXT4_GET_BLOCKS_CREATE) == 0) {
Amit Arora56055d32007-07-17 21:42:38 -04004369 /*
4370 * put just found gap into cache to speed up
4371 * subsequent requests
4372 */
Zheng Liu2f8e0a72014-11-25 11:44:37 -05004373 ext4_ext_put_gap_in_cache(inode, path, map->m_lblk);
Alex Tomasa86c6182006-10-11 01:21:03 -07004374 goto out2;
4375 }
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004376
Alex Tomasa86c6182006-10-11 01:21:03 -07004377 /*
Theodore Ts'oc2ea3fd2008-10-10 09:40:52 -04004378 * Okay, we need to do block allocation.
Andrew Morton63f57932006-10-11 01:21:24 -07004379 */
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004380 newex.ee_block = cpu_to_le32(map->m_lblk);
Eric Whitneyd0abafa2014-01-06 14:00:23 -05004381 cluster_offset = EXT4_LBLK_COFF(sbi, map->m_lblk);
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004382
4383 /*
4384 * If we are doing bigalloc, check to see if the extent returned
Theodore Ts'oed8a1a72014-09-01 14:43:09 -04004385 * by ext4_find_extent() implies a cluster we can use.
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004386 */
4387 if (cluster_offset && ex &&
Aditya Kalid8990242011-09-09 19:18:51 -04004388 get_implied_cluster_alloc(inode->i_sb, map, ex, path)) {
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004389 ar.len = allocated = map->m_len;
4390 newblock = map->m_pblk;
Jan Karacbd75842014-11-25 11:41:49 -05004391 map_from_cluster = true;
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004392 goto got_allocated_blocks;
4393 }
Alex Tomasa86c6182006-10-11 01:21:03 -07004394
Alex Tomasc9de5602008-01-29 00:19:52 -05004395 /* find neighbour allocated blocks */
Theodore Ts'oe35fd662010-05-16 19:00:00 -04004396 ar.lleft = map->m_lblk;
Alex Tomasc9de5602008-01-29 00:19:52 -05004397 err = ext4_ext_search_left(inode, path, &ar.lleft, &ar.pleft);
4398 if (err)
4399 goto out2;
Theodore Ts'oe35fd662010-05-16 19:00:00 -04004400 ar.lright = map->m_lblk;
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004401 ex2 = NULL;
4402 err = ext4_ext_search_right(inode, path, &ar.lright, &ar.pright, &ex2);
Alex Tomasc9de5602008-01-29 00:19:52 -05004403 if (err)
4404 goto out2;
Amit Arora25d14f92007-05-24 13:04:13 -04004405
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004406 /* Check if the extent after searching to the right implies a
4407 * cluster we can use. */
4408 if ((sbi->s_cluster_ratio > 1) && ex2 &&
Aditya Kalid8990242011-09-09 19:18:51 -04004409 get_implied_cluster_alloc(inode->i_sb, map, ex2, path)) {
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004410 ar.len = allocated = map->m_len;
4411 newblock = map->m_pblk;
Jan Karacbd75842014-11-25 11:41:49 -05004412 map_from_cluster = true;
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004413 goto got_allocated_blocks;
4414 }
4415
Amit Arora749269f2007-07-18 09:02:56 -04004416 /*
4417 * See if request is beyond maximum number of blocks we can have in
4418 * a single extent. For an initialized extent this limit is
Lukas Czerner556615d2014-04-20 23:45:47 -04004419 * EXT_INIT_MAX_LEN and for an unwritten extent this limit is
4420 * EXT_UNWRITTEN_MAX_LEN.
Amit Arora749269f2007-07-18 09:02:56 -04004421 */
Theodore Ts'oe35fd662010-05-16 19:00:00 -04004422 if (map->m_len > EXT_INIT_MAX_LEN &&
Lukas Czerner556615d2014-04-20 23:45:47 -04004423 !(flags & EXT4_GET_BLOCKS_UNWRIT_EXT))
Theodore Ts'oe35fd662010-05-16 19:00:00 -04004424 map->m_len = EXT_INIT_MAX_LEN;
Lukas Czerner556615d2014-04-20 23:45:47 -04004425 else if (map->m_len > EXT_UNWRITTEN_MAX_LEN &&
4426 (flags & EXT4_GET_BLOCKS_UNWRIT_EXT))
4427 map->m_len = EXT_UNWRITTEN_MAX_LEN;
Amit Arora749269f2007-07-18 09:02:56 -04004428
Theodore Ts'oe35fd662010-05-16 19:00:00 -04004429 /* Check if we can really insert (m_lblk)::(m_lblk + m_len) extent */
Theodore Ts'oe35fd662010-05-16 19:00:00 -04004430 newex.ee_len = cpu_to_le16(map->m_len);
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004431 err = ext4_ext_check_overlap(sbi, inode, &newex, path);
Amit Arora25d14f92007-05-24 13:04:13 -04004432 if (err)
Aneesh Kumar K.Vb939e372008-01-28 23:58:27 -05004433 allocated = ext4_ext_get_actual_len(&newex);
Amit Arora25d14f92007-05-24 13:04:13 -04004434 else
Theodore Ts'oe35fd662010-05-16 19:00:00 -04004435 allocated = map->m_len;
Alex Tomasc9de5602008-01-29 00:19:52 -05004436
4437 /* allocate new block */
4438 ar.inode = inode;
Theodore Ts'oe35fd662010-05-16 19:00:00 -04004439 ar.goal = ext4_ext_find_goal(inode, path, map->m_lblk);
4440 ar.logical = map->m_lblk;
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004441 /*
4442 * We calculate the offset from the beginning of the cluster
4443 * for the logical block number, since when we allocate a
4444 * physical cluster, the physical block should start at the
4445 * same offset from the beginning of the cluster. This is
4446 * needed so that future calls to get_implied_cluster_alloc()
4447 * work correctly.
4448 */
Theodore Ts'of5a44db2013-12-20 09:29:35 -05004449 offset = EXT4_LBLK_COFF(sbi, map->m_lblk);
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004450 ar.len = EXT4_NUM_B2C(sbi, offset+allocated);
4451 ar.goal -= offset;
4452 ar.logical -= offset;
Alex Tomasc9de5602008-01-29 00:19:52 -05004453 if (S_ISREG(inode->i_mode))
4454 ar.flags = EXT4_MB_HINT_DATA;
4455 else
4456 /* disable in-core preallocation for non-regular files */
4457 ar.flags = 0;
Vivek Haldar556b27a2011-05-25 07:41:54 -04004458 if (flags & EXT4_GET_BLOCKS_NO_NORMALIZE)
4459 ar.flags |= EXT4_MB_HINT_NOPREALLOC;
Theodore Ts'oe3cf5d52014-09-04 18:07:25 -04004460 if (flags & EXT4_GET_BLOCKS_DELALLOC_RESERVE)
4461 ar.flags |= EXT4_MB_DELALLOC_RESERVED;
Alex Tomasc9de5602008-01-29 00:19:52 -05004462 newblock = ext4_mb_new_blocks(handle, &ar, &err);
Alex Tomasa86c6182006-10-11 01:21:03 -07004463 if (!newblock)
4464 goto out2;
Mingming84fe3be2009-09-01 08:44:37 -04004465 ext_debug("allocate new block: goal %llu, found %llu/%u\n",
Theodore Ts'o498e5f22008-11-05 00:14:04 -05004466 ar.goal, newblock, allocated);
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004467 free_on_err = 1;
Aditya Kali7b415bf2011-09-09 19:04:51 -04004468 allocated_clusters = ar.len;
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004469 ar.len = EXT4_C2B(sbi, ar.len) - offset;
4470 if (ar.len > allocated)
4471 ar.len = allocated;
Alex Tomasa86c6182006-10-11 01:21:03 -07004472
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004473got_allocated_blocks:
Alex Tomasa86c6182006-10-11 01:21:03 -07004474 /* try to insert new extent into found leaf and return */
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004475 ext4_ext_store_pblock(&newex, newblock + offset);
Alex Tomasc9de5602008-01-29 00:19:52 -05004476 newex.ee_len = cpu_to_le16(ar.len);
Lukas Czerner556615d2014-04-20 23:45:47 -04004477 /* Mark unwritten */
4478 if (flags & EXT4_GET_BLOCKS_UNWRIT_EXT){
4479 ext4_ext_mark_unwritten(&newex);
Zheng Liua25a4e12013-02-18 00:28:04 -05004480 map->m_flags |= EXT4_MAP_UNWRITTEN;
Mingming Cao8d5d02e2009-09-28 15:48:29 -04004481 /*
Jiaying Zhang744692d2010-03-04 16:14:02 -05004482 * io_end structure was created for every IO write to an
Lukas Czerner556615d2014-04-20 23:45:47 -04004483 * unwritten extent. To avoid unnecessary conversion,
Jiaying Zhang744692d2010-03-04 16:14:02 -05004484 * here we flag the IO that really needs the conversion.
Mingming5f524952009-11-10 10:48:04 -05004485 * For non asycn direct IO case, flag the inode state
Lucas De Marchi25985ed2011-03-30 22:57:33 -03004486 * that we need to perform conversion when IO is done.
Mingming Cao8d5d02e2009-09-28 15:48:29 -04004487 */
Lukas Czernerc8b459f2014-05-12 12:55:07 -04004488 if (flags & EXT4_GET_BLOCKS_PRE_IO)
Dmitry Monakhov82e54222012-09-28 23:36:25 -04004489 set_unwritten = 1;
Mingming Cao8d5d02e2009-09-28 15:48:29 -04004490 }
Jiaying Zhangc8d46e42010-02-24 09:52:53 -05004491
Dmitry Monakhova4e5d882011-10-25 08:15:12 -04004492 err = 0;
4493 if ((flags & EXT4_GET_BLOCKS_KEEP_SIZE) == 0)
4494 err = check_eofblocks_fl(handle, inode, map->m_lblk,
4495 path, ar.len);
Jiaying Zhang575a1d42011-07-10 20:07:25 -04004496 if (!err)
Theodore Ts'odfe50802014-09-01 14:37:09 -04004497 err = ext4_ext_insert_extent(handle, inode, &path,
Jiaying Zhang575a1d42011-07-10 20:07:25 -04004498 &newex, flags);
Dmitry Monakhov82e54222012-09-28 23:36:25 -04004499
4500 if (!err && set_unwritten) {
4501 if (io)
4502 ext4_set_io_unwritten_flag(inode, io);
4503 else
4504 ext4_set_inode_state(inode,
4505 EXT4_STATE_DIO_UNWRITTEN);
4506 }
4507
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004508 if (err && free_on_err) {
Maxim Patlasov7132de72011-07-10 19:37:48 -04004509 int fb_flags = flags & EXT4_GET_BLOCKS_DELALLOC_RESERVE ?
4510 EXT4_FREE_BLOCKS_NO_QUOT_UPDATE : 0;
Alex Tomas315054f2007-05-24 13:04:25 -04004511 /* free data blocks we just allocated */
Alex Tomasc9de5602008-01-29 00:19:52 -05004512 /* not a good idea to call discard here directly,
4513 * but otherwise we'd need to call it every free() */
Theodore Ts'oc2ea3fd2008-10-10 09:40:52 -04004514 ext4_discard_preallocations(inode);
Theodore Ts'oc8e15132013-07-15 00:09:37 -04004515 ext4_free_blocks(handle, inode, NULL, newblock,
4516 EXT4_C2B(sbi, allocated_clusters), fb_flags);
Alex Tomasa86c6182006-10-11 01:21:03 -07004517 goto out2;
Alex Tomas315054f2007-05-24 13:04:25 -04004518 }
Alex Tomasa86c6182006-10-11 01:21:03 -07004519
Alex Tomasa86c6182006-10-11 01:21:03 -07004520 /* previous routine could use block we allocated */
Theodore Ts'obf89d162010-10-27 21:30:14 -04004521 newblock = ext4_ext_pblock(&newex);
Aneesh Kumar K.Vb939e372008-01-28 23:58:27 -05004522 allocated = ext4_ext_get_actual_len(&newex);
Theodore Ts'oe35fd662010-05-16 19:00:00 -04004523 if (allocated > map->m_len)
4524 allocated = map->m_len;
4525 map->m_flags |= EXT4_MAP_NEW;
Alex Tomasa86c6182006-10-11 01:21:03 -07004526
Jan Karab436b9b2009-12-08 23:51:10 -05004527 /*
Aneesh Kumar K.V5f634d02010-01-25 04:00:31 -05004528 * Update reserved blocks/metadata blocks after successful
4529 * block allocation which had been deferred till now.
4530 */
Aditya Kali7b415bf2011-09-09 19:04:51 -04004531 if (flags & EXT4_GET_BLOCKS_DELALLOC_RESERVE) {
Yongqiang Yang81fdbb42011-10-29 09:23:38 -04004532 unsigned int reserved_clusters;
Aditya Kali7b415bf2011-09-09 19:04:51 -04004533 /*
Yongqiang Yang81fdbb42011-10-29 09:23:38 -04004534 * Check how many clusters we had reserved this allocated range
Aditya Kali7b415bf2011-09-09 19:04:51 -04004535 */
4536 reserved_clusters = get_reserved_cluster_alloc(inode,
4537 map->m_lblk, allocated);
Jan Karacbd75842014-11-25 11:41:49 -05004538 if (map_from_cluster) {
Aditya Kali7b415bf2011-09-09 19:04:51 -04004539 if (reserved_clusters) {
4540 /*
4541 * We have clusters reserved for this range.
4542 * But since we are not doing actual allocation
4543 * and are simply using blocks from previously
4544 * allocated cluster, we should release the
4545 * reservation and not claim quota.
4546 */
4547 ext4_da_update_reserve_space(inode,
4548 reserved_clusters, 0);
4549 }
4550 } else {
4551 BUG_ON(allocated_clusters < reserved_clusters);
Aditya Kali7b415bf2011-09-09 19:04:51 -04004552 if (reserved_clusters < allocated_clusters) {
Aditya Kali5356f262011-09-09 19:20:51 -04004553 struct ext4_inode_info *ei = EXT4_I(inode);
Aditya Kali7b415bf2011-09-09 19:04:51 -04004554 int reservation = allocated_clusters -
4555 reserved_clusters;
4556 /*
4557 * It seems we claimed few clusters outside of
4558 * the range of this allocation. We should give
4559 * it back to the reservation pool. This can
4560 * happen in the following case:
4561 *
4562 * * Suppose s_cluster_ratio is 4 (i.e., each
4563 * cluster has 4 blocks. Thus, the clusters
4564 * are [0-3],[4-7],[8-11]...
4565 * * First comes delayed allocation write for
4566 * logical blocks 10 & 11. Since there were no
4567 * previous delayed allocated blocks in the
4568 * range [8-11], we would reserve 1 cluster
4569 * for this write.
4570 * * Next comes write for logical blocks 3 to 8.
4571 * In this case, we will reserve 2 clusters
4572 * (for [0-3] and [4-7]; and not for [8-11] as
4573 * that range has a delayed allocated blocks.
4574 * Thus total reserved clusters now becomes 3.
4575 * * Now, during the delayed allocation writeout
4576 * time, we will first write blocks [3-8] and
4577 * allocate 3 clusters for writing these
4578 * blocks. Also, we would claim all these
4579 * three clusters above.
4580 * * Now when we come here to writeout the
4581 * blocks [10-11], we would expect to claim
4582 * the reservation of 1 cluster we had made
4583 * (and we would claim it since there are no
4584 * more delayed allocated blocks in the range
4585 * [8-11]. But our reserved cluster count had
4586 * already gone to 0.
4587 *
4588 * Thus, at the step 4 above when we determine
4589 * that there are still some unwritten delayed
4590 * allocated blocks outside of our current
4591 * block range, we should increment the
4592 * reserved clusters count so that when the
4593 * remaining blocks finally gets written, we
4594 * could claim them.
4595 */
Aditya Kali5356f262011-09-09 19:20:51 -04004596 dquot_reserve_block(inode,
4597 EXT4_C2B(sbi, reservation));
4598 spin_lock(&ei->i_block_reservation_lock);
4599 ei->i_reserved_data_blocks += reservation;
4600 spin_unlock(&ei->i_block_reservation_lock);
Aditya Kali7b415bf2011-09-09 19:04:51 -04004601 }
Lukas Czerner232ec872013-03-10 22:46:30 -04004602 /*
4603 * We will claim quota for all newly allocated blocks.
4604 * We're updating the reserved space *after* the
4605 * correction above so we do not accidentally free
4606 * all the metadata reservation because we might
4607 * actually need it later on.
4608 */
4609 ext4_da_update_reserve_space(inode, allocated_clusters,
4610 1);
Aditya Kali7b415bf2011-09-09 19:04:51 -04004611 }
4612 }
Aneesh Kumar K.V5f634d02010-01-25 04:00:31 -05004613
4614 /*
Jan Karab436b9b2009-12-08 23:51:10 -05004615 * Cache the extent and update transaction to commit on fdatasync only
Lukas Czerner556615d2014-04-20 23:45:47 -04004616 * when it is _not_ an unwritten extent.
Jan Karab436b9b2009-12-08 23:51:10 -05004617 */
Lukas Czerner556615d2014-04-20 23:45:47 -04004618 if ((flags & EXT4_GET_BLOCKS_UNWRIT_EXT) == 0)
Jan Karab436b9b2009-12-08 23:51:10 -05004619 ext4_update_inode_fsync_trans(handle, inode, 1);
Zheng Liu69eb33d2013-02-18 00:31:07 -05004620 else
Jan Karab436b9b2009-12-08 23:51:10 -05004621 ext4_update_inode_fsync_trans(handle, inode, 0);
Alex Tomasa86c6182006-10-11 01:21:03 -07004622out:
Theodore Ts'oe35fd662010-05-16 19:00:00 -04004623 if (allocated > map->m_len)
4624 allocated = map->m_len;
Alex Tomasa86c6182006-10-11 01:21:03 -07004625 ext4_ext_show_leaf(inode, path);
Theodore Ts'oe35fd662010-05-16 19:00:00 -04004626 map->m_flags |= EXT4_MAP_MAPPED;
4627 map->m_pblk = newblock;
4628 map->m_len = allocated;
Alex Tomasa86c6182006-10-11 01:21:03 -07004629out2:
Theodore Ts'ob7ea89a2014-09-01 14:39:09 -04004630 ext4_ext_drop_refs(path);
4631 kfree(path);
Allison Hendersone8613042011-05-25 07:41:46 -04004632
Theodore Ts'o63b99962013-07-16 10:28:47 -04004633 trace_ext4_ext_map_blocks_exit(inode, flags, map,
4634 err ? err : allocated);
Lukas Czerner78771912012-03-19 23:05:43 -04004635 return err ? err : allocated;
Alex Tomasa86c6182006-10-11 01:21:03 -07004636}
4637
Theodore Ts'o819c4922013-04-03 12:47:17 -04004638void ext4_ext_truncate(handle_t *handle, struct inode *inode)
Alex Tomasa86c6182006-10-11 01:21:03 -07004639{
Alex Tomasa86c6182006-10-11 01:21:03 -07004640 struct super_block *sb = inode->i_sb;
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05004641 ext4_lblk_t last_block;
Alex Tomasa86c6182006-10-11 01:21:03 -07004642 int err = 0;
4643
4644 /*
Randy Dunlapd0d856e2006-10-11 01:21:07 -07004645 * TODO: optimization is possible here.
4646 * Probably we need not scan at all,
4647 * because page truncation is enough.
Alex Tomasa86c6182006-10-11 01:21:03 -07004648 */
Alex Tomasa86c6182006-10-11 01:21:03 -07004649
4650 /* we have to know where to truncate from in crash case */
4651 EXT4_I(inode)->i_disksize = inode->i_size;
4652 ext4_mark_inode_dirty(handle, inode);
4653
4654 last_block = (inode->i_size + sb->s_blocksize - 1)
4655 >> EXT4_BLOCK_SIZE_BITS(sb);
Theodore Ts'o8acd5e92013-07-15 00:09:19 -04004656retry:
Zheng Liu51865fd2012-11-08 21:57:32 -05004657 err = ext4_es_remove_extent(inode, last_block,
4658 EXT_MAX_BLOCKS - last_block);
Theodore Ts'o94eec0f2013-07-29 12:12:56 -04004659 if (err == -ENOMEM) {
Theodore Ts'o8acd5e92013-07-15 00:09:19 -04004660 cond_resched();
4661 congestion_wait(BLK_RW_ASYNC, HZ/50);
4662 goto retry;
4663 }
4664 if (err) {
4665 ext4_std_error(inode->i_sb, err);
4666 return;
4667 }
Lukas Czerner5f95d212012-03-19 23:03:19 -04004668 err = ext4_ext_remove_space(inode, last_block, EXT_MAX_BLOCKS - 1);
Theodore Ts'o8acd5e92013-07-15 00:09:19 -04004669 ext4_std_error(inode->i_sb, err);
Alex Tomasa86c6182006-10-11 01:21:03 -07004670}
4671
Lukas Czerner0e8b6872014-03-18 18:03:51 -04004672static int ext4_alloc_file_blocks(struct file *file, ext4_lblk_t offset,
Dmitry Monakhovc174e6d2014-08-27 18:40:00 -04004673 ext4_lblk_t len, loff_t new_size,
4674 int flags, int mode)
Amit Aroraa2df2a62007-07-17 21:42:41 -04004675{
Al Viro496ad9a2013-01-23 17:07:38 -05004676 struct inode *inode = file_inode(file);
Amit Aroraa2df2a62007-07-17 21:42:41 -04004677 handle_t *handle;
Amit Aroraa2df2a62007-07-17 21:42:41 -04004678 int ret = 0;
4679 int ret2 = 0;
4680 int retries = 0;
Theodore Ts'o2ed88682010-05-16 20:00:00 -04004681 struct ext4_map_blocks map;
Lukas Czerner0e8b6872014-03-18 18:03:51 -04004682 unsigned int credits;
Dmitry Monakhovc174e6d2014-08-27 18:40:00 -04004683 loff_t epos;
Amit Aroraa2df2a62007-07-17 21:42:41 -04004684
Lukas Czerner0e8b6872014-03-18 18:03:51 -04004685 map.m_lblk = offset;
Dmitry Monakhovc174e6d2014-08-27 18:40:00 -04004686 map.m_len = len;
Greg Harm3c6fe772011-10-31 18:41:47 -04004687 /*
4688 * Don't normalize the request if it can fit in one extent so
4689 * that it doesn't get unnecessarily split into multiple
4690 * extents.
4691 */
Lukas Czerner556615d2014-04-20 23:45:47 -04004692 if (len <= EXT_UNWRITTEN_MAX_LEN)
Greg Harm3c6fe772011-10-31 18:41:47 -04004693 flags |= EXT4_GET_BLOCKS_NO_NORMALIZE;
Dmitry Monakhov60d46162012-10-05 11:32:02 -04004694
Lukas Czerner0e8b6872014-03-18 18:03:51 -04004695 /*
4696 * credits to insert 1 extent into extent tree
4697 */
4698 credits = ext4_chunk_trans_blocks(inode, len);
4699
Amit Aroraa2df2a62007-07-17 21:42:41 -04004700retry:
Dmitry Monakhovc174e6d2014-08-27 18:40:00 -04004701 while (ret >= 0 && len) {
Theodore Ts'o9924a922013-02-08 21:59:22 -05004702 handle = ext4_journal_start(inode, EXT4_HT_MAP_BLOCKS,
4703 credits);
Amit Aroraa2df2a62007-07-17 21:42:41 -04004704 if (IS_ERR(handle)) {
4705 ret = PTR_ERR(handle);
4706 break;
4707 }
Dmitry Monakhova4e5d882011-10-25 08:15:12 -04004708 ret = ext4_map_blocks(handle, inode, &map, flags);
Aneesh Kumar K.V221879c2008-01-28 23:58:27 -05004709 if (ret <= 0) {
Lukas Czernerf282ac12014-03-18 17:44:35 -04004710 ext4_debug("inode #%lu: block %u: len %u: "
4711 "ext4_ext_map_blocks returned %d",
4712 inode->i_ino, map.m_lblk,
4713 map.m_len, ret);
Amit Aroraa2df2a62007-07-17 21:42:41 -04004714 ext4_mark_inode_dirty(handle, inode);
4715 ret2 = ext4_journal_stop(handle);
4716 break;
4717 }
Dmitry Monakhovc174e6d2014-08-27 18:40:00 -04004718 map.m_lblk += ret;
4719 map.m_len = len = len - ret;
4720 epos = (loff_t)map.m_lblk << inode->i_blkbits;
4721 inode->i_ctime = ext4_current_time(inode);
4722 if (new_size) {
4723 if (epos > new_size)
4724 epos = new_size;
4725 if (ext4_update_inode_size(inode, epos) & 0x1)
4726 inode->i_mtime = inode->i_ctime;
4727 } else {
4728 if (epos > inode->i_size)
4729 ext4_set_inode_flag(inode,
4730 EXT4_INODE_EOFBLOCKS);
4731 }
4732 ext4_mark_inode_dirty(handle, inode);
Amit Aroraa2df2a62007-07-17 21:42:41 -04004733 ret2 = ext4_journal_stop(handle);
4734 if (ret2)
4735 break;
4736 }
Aneesh Kumar K.Vfd287842008-04-29 08:11:12 -04004737 if (ret == -ENOSPC &&
4738 ext4_should_retry_alloc(inode->i_sb, &retries)) {
4739 ret = 0;
Amit Aroraa2df2a62007-07-17 21:42:41 -04004740 goto retry;
Amit Aroraa2df2a62007-07-17 21:42:41 -04004741 }
Lukas Czernerf282ac12014-03-18 17:44:35 -04004742
Lukas Czerner0e8b6872014-03-18 18:03:51 -04004743 return ret > 0 ? ret2 : ret;
4744}
4745
Lukas Czernerb8a86842014-03-18 18:05:35 -04004746static long ext4_zero_range(struct file *file, loff_t offset,
4747 loff_t len, int mode)
4748{
4749 struct inode *inode = file_inode(file);
4750 handle_t *handle = NULL;
4751 unsigned int max_blocks;
4752 loff_t new_size = 0;
4753 int ret = 0;
4754 int flags;
Dmitry Monakhov69dc9532014-08-27 18:33:49 -04004755 int credits;
Dmitry Monakhovc174e6d2014-08-27 18:40:00 -04004756 int partial_begin, partial_end;
Lukas Czernerb8a86842014-03-18 18:05:35 -04004757 loff_t start, end;
4758 ext4_lblk_t lblk;
4759 struct address_space *mapping = inode->i_mapping;
4760 unsigned int blkbits = inode->i_blkbits;
4761
4762 trace_ext4_zero_range(inode, offset, len, mode);
4763
jon ernst6c5e73d2014-04-18 11:50:35 -04004764 if (!S_ISREG(inode->i_mode))
4765 return -EINVAL;
4766
Namjae Jeone1ee60f2014-05-27 12:48:55 -04004767 /* Call ext4_force_commit to flush all data in case of data=journal. */
4768 if (ext4_should_journal_data(inode)) {
4769 ret = ext4_force_commit(inode->i_sb);
4770 if (ret)
4771 return ret;
4772 }
4773
Lukas Czernerb8a86842014-03-18 18:05:35 -04004774 /*
4775 * Write out all dirty pages to avoid race conditions
4776 * Then release them.
4777 */
4778 if (mapping->nrpages && mapping_tagged(mapping, PAGECACHE_TAG_DIRTY)) {
4779 ret = filemap_write_and_wait_range(mapping, offset,
4780 offset + len - 1);
4781 if (ret)
4782 return ret;
4783 }
4784
4785 /*
4786 * Round up offset. This is not fallocate, we neet to zero out
4787 * blocks, so convert interior block aligned part of the range to
4788 * unwritten and possibly manually zero out unaligned parts of the
4789 * range.
4790 */
4791 start = round_up(offset, 1 << blkbits);
4792 end = round_down((offset + len), 1 << blkbits);
4793
4794 if (start < offset || end > offset + len)
4795 return -EINVAL;
Dmitry Monakhovc174e6d2014-08-27 18:40:00 -04004796 partial_begin = offset & ((1 << blkbits) - 1);
4797 partial_end = (offset + len) & ((1 << blkbits) - 1);
Lukas Czernerb8a86842014-03-18 18:05:35 -04004798
4799 lblk = start >> blkbits;
4800 max_blocks = (end >> blkbits);
4801 if (max_blocks < lblk)
4802 max_blocks = 0;
4803 else
4804 max_blocks -= lblk;
4805
Lukas Czerner556615d2014-04-20 23:45:47 -04004806 flags = EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT |
Theodore Ts'o713e8dd2014-09-01 14:32:09 -04004807 EXT4_GET_BLOCKS_CONVERT_UNWRITTEN |
4808 EXT4_EX_NOCACHE;
Lukas Czernerb8a86842014-03-18 18:05:35 -04004809 if (mode & FALLOC_FL_KEEP_SIZE)
4810 flags |= EXT4_GET_BLOCKS_KEEP_SIZE;
4811
4812 mutex_lock(&inode->i_mutex);
4813
4814 /*
4815 * Indirect files do not support unwritten extnets
4816 */
4817 if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) {
4818 ret = -EOPNOTSUPP;
4819 goto out_mutex;
4820 }
4821
4822 if (!(mode & FALLOC_FL_KEEP_SIZE) &&
4823 offset + len > i_size_read(inode)) {
4824 new_size = offset + len;
4825 ret = inode_newsize_ok(inode, new_size);
4826 if (ret)
4827 goto out_mutex;
4828 /*
4829 * If we have a partial block after EOF we have to allocate
4830 * the entire block.
4831 */
Dmitry Monakhovc174e6d2014-08-27 18:40:00 -04004832 if (partial_end)
Lukas Czernerb8a86842014-03-18 18:05:35 -04004833 max_blocks += 1;
4834 }
4835
4836 if (max_blocks > 0) {
4837
4838 /* Now release the pages and zero block aligned part of pages*/
4839 truncate_pagecache_range(inode, start, end - 1);
Dmitry Monakhovc174e6d2014-08-27 18:40:00 -04004840 inode->i_mtime = inode->i_ctime = ext4_current_time(inode);
Lukas Czernerb8a86842014-03-18 18:05:35 -04004841
4842 /* Wait all existing dio workers, newcomers will block on i_mutex */
4843 ext4_inode_block_unlocked_dio(inode);
4844 inode_dio_wait(inode);
4845
Dmitry Monakhovc174e6d2014-08-27 18:40:00 -04004846 ret = ext4_alloc_file_blocks(file, lblk, max_blocks, new_size,
4847 flags, mode);
Lukas Czernerb8a86842014-03-18 18:05:35 -04004848 if (ret)
4849 goto out_dio;
Theodore Ts'o713e8dd2014-09-01 14:32:09 -04004850 /*
4851 * Remove entire range from the extent status tree.
4852 *
4853 * ext4_es_remove_extent(inode, lblk, max_blocks) is
4854 * NOT sufficient. I'm not sure why this is the case,
4855 * but let's be conservative and remove the extent
4856 * status tree for the entire inode. There should be
4857 * no outstanding delalloc extents thanks to the
4858 * filemap_write_and_wait_range() call above.
4859 */
4860 ret = ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS);
4861 if (ret)
4862 goto out_dio;
Lukas Czernerb8a86842014-03-18 18:05:35 -04004863 }
Dmitry Monakhovc174e6d2014-08-27 18:40:00 -04004864 if (!partial_begin && !partial_end)
4865 goto out_dio;
4866
Dmitry Monakhov69dc9532014-08-27 18:33:49 -04004867 /*
4868 * In worst case we have to writeout two nonadjacent unwritten
4869 * blocks and update the inode
4870 */
4871 credits = (2 * ext4_ext_index_trans_blocks(inode, 2)) + 1;
4872 if (ext4_should_journal_data(inode))
4873 credits += 2;
4874 handle = ext4_journal_start(inode, EXT4_HT_MISC, credits);
Lukas Czernerb8a86842014-03-18 18:05:35 -04004875 if (IS_ERR(handle)) {
4876 ret = PTR_ERR(handle);
4877 ext4_std_error(inode->i_sb, ret);
4878 goto out_dio;
4879 }
4880
4881 inode->i_mtime = inode->i_ctime = ext4_current_time(inode);
Lukas Czernere5b30412014-04-01 00:59:21 -04004882 if (new_size) {
Dmitry Monakhov4631dbf2014-08-23 17:48:28 -04004883 ext4_update_inode_size(inode, new_size);
Lukas Czernere5b30412014-04-01 00:59:21 -04004884 } else {
Lukas Czernerb8a86842014-03-18 18:05:35 -04004885 /*
4886 * Mark that we allocate beyond EOF so the subsequent truncate
4887 * can proceed even if the new size is the same as i_size.
4888 */
4889 if ((offset + len) > i_size_read(inode))
4890 ext4_set_inode_flag(inode, EXT4_INODE_EOFBLOCKS);
4891 }
Lukas Czernerb8a86842014-03-18 18:05:35 -04004892 ext4_mark_inode_dirty(handle, inode);
4893
4894 /* Zero out partial block at the edges of the range */
4895 ret = ext4_zero_partial_blocks(handle, inode, offset, len);
4896
4897 if (file->f_flags & O_SYNC)
4898 ext4_handle_sync(handle);
4899
4900 ext4_journal_stop(handle);
4901out_dio:
4902 ext4_inode_resume_unlocked_dio(inode);
4903out_mutex:
4904 mutex_unlock(&inode->i_mutex);
4905 return ret;
4906}
4907
Lukas Czerner0e8b6872014-03-18 18:03:51 -04004908/*
4909 * preallocate space for a file. This implements ext4's fallocate file
4910 * operation, which gets called from sys_fallocate system call.
4911 * For block-mapped files, posix_fallocate should fall back to the method
4912 * of writing zeroes to the required new blocks (the same behavior which is
4913 * expected for file systems which do not support fallocate() system call).
4914 */
4915long ext4_fallocate(struct file *file, int mode, loff_t offset, loff_t len)
4916{
4917 struct inode *inode = file_inode(file);
Lukas Czerner0e8b6872014-03-18 18:03:51 -04004918 loff_t new_size = 0;
4919 unsigned int max_blocks;
4920 int ret = 0;
4921 int flags;
4922 ext4_lblk_t lblk;
Lukas Czerner0e8b6872014-03-18 18:03:51 -04004923 unsigned int blkbits = inode->i_blkbits;
4924
4925 /* Return error if mode is not supported */
4926 if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE |
Lukas Czernerb8a86842014-03-18 18:05:35 -04004927 FALLOC_FL_COLLAPSE_RANGE | FALLOC_FL_ZERO_RANGE))
Lukas Czerner0e8b6872014-03-18 18:03:51 -04004928 return -EOPNOTSUPP;
4929
4930 if (mode & FALLOC_FL_PUNCH_HOLE)
4931 return ext4_punch_hole(inode, offset, len);
4932
Lukas Czerner0e8b6872014-03-18 18:03:51 -04004933 ret = ext4_convert_inline_data(inode);
4934 if (ret)
4935 return ret;
4936
4937 /*
4938 * currently supporting (pre)allocate mode for extent-based
4939 * files _only_
4940 */
4941 if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)))
4942 return -EOPNOTSUPP;
4943
Theodore Ts'o40c406c2014-04-12 22:53:53 -04004944 if (mode & FALLOC_FL_COLLAPSE_RANGE)
4945 return ext4_collapse_range(inode, offset, len);
4946
Lukas Czernerb8a86842014-03-18 18:05:35 -04004947 if (mode & FALLOC_FL_ZERO_RANGE)
4948 return ext4_zero_range(file, offset, len, mode);
4949
Lukas Czerner0e8b6872014-03-18 18:03:51 -04004950 trace_ext4_fallocate_enter(inode, offset, len, mode);
4951 lblk = offset >> blkbits;
4952 /*
4953 * We can't just convert len to max_blocks because
4954 * If blocksize = 4096 offset = 3072 and len = 2048
4955 */
4956 max_blocks = (EXT4_BLOCK_ALIGN(len + offset, blkbits) >> blkbits)
4957 - lblk;
4958
Lukas Czerner556615d2014-04-20 23:45:47 -04004959 flags = EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT;
Lukas Czerner0e8b6872014-03-18 18:03:51 -04004960 if (mode & FALLOC_FL_KEEP_SIZE)
4961 flags |= EXT4_GET_BLOCKS_KEEP_SIZE;
4962
4963 mutex_lock(&inode->i_mutex);
4964
4965 if (!(mode & FALLOC_FL_KEEP_SIZE) &&
4966 offset + len > i_size_read(inode)) {
4967 new_size = offset + len;
4968 ret = inode_newsize_ok(inode, new_size);
4969 if (ret)
4970 goto out;
4971 }
4972
Dmitry Monakhovc174e6d2014-08-27 18:40:00 -04004973 ret = ext4_alloc_file_blocks(file, lblk, max_blocks, new_size,
4974 flags, mode);
Lukas Czerner0e8b6872014-03-18 18:03:51 -04004975 if (ret)
4976 goto out;
4977
Dmitry Monakhovc174e6d2014-08-27 18:40:00 -04004978 if (file->f_flags & O_SYNC && EXT4_SB(inode->i_sb)->s_journal) {
4979 ret = jbd2_complete_transaction(EXT4_SB(inode->i_sb)->s_journal,
4980 EXT4_I(inode)->i_sync_tid);
Lukas Czernerf282ac12014-03-18 17:44:35 -04004981 }
Lukas Czernerf282ac12014-03-18 17:44:35 -04004982out:
Aneesh Kumar K.V55bd7252008-02-15 12:47:21 -05004983 mutex_unlock(&inode->i_mutex);
Lukas Czerner0e8b6872014-03-18 18:03:51 -04004984 trace_ext4_fallocate_exit(inode, offset, max_blocks, ret);
4985 return ret;
Amit Aroraa2df2a62007-07-17 21:42:41 -04004986}
Eric Sandeen6873fa02008-10-07 00:46:36 -04004987
4988/*
Mingming Cao00314622009-09-28 15:49:08 -04004989 * This function convert a range of blocks to written extents
4990 * The caller of this function will pass the start offset and the size.
4991 * all unwritten extents within this range will be converted to
4992 * written extents.
4993 *
4994 * This function is called from the direct IO end io call back
4995 * function, to convert the fallocated extents after IO is completed.
Mingming109f5562009-11-10 10:48:08 -05004996 * Returns 0 on success.
Mingming Cao00314622009-09-28 15:49:08 -04004997 */
Jan Kara6b523df2013-06-04 13:21:11 -04004998int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode,
4999 loff_t offset, ssize_t len)
Mingming Cao00314622009-09-28 15:49:08 -04005000{
Mingming Cao00314622009-09-28 15:49:08 -04005001 unsigned int max_blocks;
5002 int ret = 0;
5003 int ret2 = 0;
Theodore Ts'o2ed88682010-05-16 20:00:00 -04005004 struct ext4_map_blocks map;
Mingming Cao00314622009-09-28 15:49:08 -04005005 unsigned int credits, blkbits = inode->i_blkbits;
5006
Theodore Ts'o2ed88682010-05-16 20:00:00 -04005007 map.m_lblk = offset >> blkbits;
Mingming Cao00314622009-09-28 15:49:08 -04005008 /*
5009 * We can't just convert len to max_blocks because
5010 * If blocksize = 4096 offset = 3072 and len = 2048
5011 */
Theodore Ts'o2ed88682010-05-16 20:00:00 -04005012 max_blocks = ((EXT4_BLOCK_ALIGN(len + offset, blkbits) >> blkbits) -
5013 map.m_lblk);
Mingming Cao00314622009-09-28 15:49:08 -04005014 /*
Jan Kara6b523df2013-06-04 13:21:11 -04005015 * This is somewhat ugly but the idea is clear: When transaction is
5016 * reserved, everything goes into it. Otherwise we rather start several
5017 * smaller transactions for conversion of each extent separately.
Mingming Cao00314622009-09-28 15:49:08 -04005018 */
Jan Kara6b523df2013-06-04 13:21:11 -04005019 if (handle) {
5020 handle = ext4_journal_start_reserved(handle,
5021 EXT4_HT_EXT_CONVERT);
5022 if (IS_ERR(handle))
5023 return PTR_ERR(handle);
5024 credits = 0;
5025 } else {
5026 /*
5027 * credits to insert 1 extent into extent tree
5028 */
5029 credits = ext4_chunk_trans_blocks(inode, max_blocks);
5030 }
Mingming Cao00314622009-09-28 15:49:08 -04005031 while (ret >= 0 && ret < max_blocks) {
Theodore Ts'o2ed88682010-05-16 20:00:00 -04005032 map.m_lblk += ret;
5033 map.m_len = (max_blocks -= ret);
Jan Kara6b523df2013-06-04 13:21:11 -04005034 if (credits) {
5035 handle = ext4_journal_start(inode, EXT4_HT_MAP_BLOCKS,
5036 credits);
5037 if (IS_ERR(handle)) {
5038 ret = PTR_ERR(handle);
5039 break;
5040 }
Mingming Cao00314622009-09-28 15:49:08 -04005041 }
Theodore Ts'o2ed88682010-05-16 20:00:00 -04005042 ret = ext4_map_blocks(handle, inode, &map,
Jiaying Zhangc7064ef2010-03-02 13:28:44 -05005043 EXT4_GET_BLOCKS_IO_CONVERT_EXT);
Lukas Czernerb06acd32013-01-28 21:21:12 -05005044 if (ret <= 0)
5045 ext4_warning(inode->i_sb,
5046 "inode #%lu: block %u: len %u: "
5047 "ext4_ext_map_blocks returned %d",
5048 inode->i_ino, map.m_lblk,
5049 map.m_len, ret);
Mingming Cao00314622009-09-28 15:49:08 -04005050 ext4_mark_inode_dirty(handle, inode);
Jan Kara6b523df2013-06-04 13:21:11 -04005051 if (credits)
5052 ret2 = ext4_journal_stop(handle);
5053 if (ret <= 0 || ret2)
Mingming Cao00314622009-09-28 15:49:08 -04005054 break;
5055 }
Jan Kara6b523df2013-06-04 13:21:11 -04005056 if (!credits)
5057 ret2 = ext4_journal_stop(handle);
Mingming Cao00314622009-09-28 15:49:08 -04005058 return ret > 0 ? ret2 : ret;
5059}
Yongqiang Yang6d9c85e2011-02-27 17:25:47 -05005060
Mingming Cao00314622009-09-28 15:49:08 -04005061/*
Zheng Liu69eb33d2013-02-18 00:31:07 -05005062 * If newes is not existing extent (newes->ec_pblk equals zero) find
5063 * delayed extent at start of newes and update newes accordingly and
Lukas Czerner91dd8c12012-11-28 12:32:26 -05005064 * return start of the next delayed extent.
5065 *
Zheng Liu69eb33d2013-02-18 00:31:07 -05005066 * If newes is existing extent (newes->ec_pblk is not equal zero)
Lukas Czerner91dd8c12012-11-28 12:32:26 -05005067 * return start of next delayed extent or EXT_MAX_BLOCKS if no delayed
Zheng Liu69eb33d2013-02-18 00:31:07 -05005068 * extent found. Leave newes unmodified.
Eric Sandeen6873fa02008-10-07 00:46:36 -04005069 */
Lukas Czerner91dd8c12012-11-28 12:32:26 -05005070static int ext4_find_delayed_extent(struct inode *inode,
Zheng Liu69eb33d2013-02-18 00:31:07 -05005071 struct extent_status *newes)
Eric Sandeen6873fa02008-10-07 00:46:36 -04005072{
Zheng Liub3aff3e2012-11-08 21:57:37 -05005073 struct extent_status es;
Zheng Liube401362013-02-18 00:27:26 -05005074 ext4_lblk_t block, next_del;
Eric Sandeen6873fa02008-10-07 00:46:36 -04005075
Zheng Liu69eb33d2013-02-18 00:31:07 -05005076 if (newes->es_pblk == 0) {
Yan, Zhenge30b5dc2013-05-03 02:15:52 -04005077 ext4_es_find_delayed_extent_range(inode, newes->es_lblk,
5078 newes->es_lblk + newes->es_len - 1, &es);
5079
Yongqiang Yang6d9c85e2011-02-27 17:25:47 -05005080 /*
Zheng Liu69eb33d2013-02-18 00:31:07 -05005081 * No extent in extent-tree contains block @newes->es_pblk,
Yongqiang Yang6d9c85e2011-02-27 17:25:47 -05005082 * then the block may stay in 1)a hole or 2)delayed-extent.
Yongqiang Yang6d9c85e2011-02-27 17:25:47 -05005083 */
Zheng Liu06b0c882013-02-18 00:26:51 -05005084 if (es.es_len == 0)
Zheng Liub3aff3e2012-11-08 21:57:37 -05005085 /* A hole found. */
Lukas Czerner91dd8c12012-11-28 12:32:26 -05005086 return 0;
Yongqiang Yang6d9c85e2011-02-27 17:25:47 -05005087
Zheng Liu69eb33d2013-02-18 00:31:07 -05005088 if (es.es_lblk > newes->es_lblk) {
Zheng Liub3aff3e2012-11-08 21:57:37 -05005089 /* A hole found. */
Zheng Liu69eb33d2013-02-18 00:31:07 -05005090 newes->es_len = min(es.es_lblk - newes->es_lblk,
5091 newes->es_len);
Lukas Czerner91dd8c12012-11-28 12:32:26 -05005092 return 0;
Eric Sandeen6873fa02008-10-07 00:46:36 -04005093 }
Yongqiang Yang6d9c85e2011-02-27 17:25:47 -05005094
Zheng Liu69eb33d2013-02-18 00:31:07 -05005095 newes->es_len = es.es_lblk + es.es_len - newes->es_lblk;
Eric Sandeen6873fa02008-10-07 00:46:36 -04005096 }
5097
Zheng Liu69eb33d2013-02-18 00:31:07 -05005098 block = newes->es_lblk + newes->es_len;
Yan, Zhenge30b5dc2013-05-03 02:15:52 -04005099 ext4_es_find_delayed_extent_range(inode, block, EXT_MAX_BLOCKS, &es);
Zheng Liube401362013-02-18 00:27:26 -05005100 if (es.es_len == 0)
5101 next_del = EXT_MAX_BLOCKS;
5102 else
5103 next_del = es.es_lblk;
5104
Lukas Czerner91dd8c12012-11-28 12:32:26 -05005105 return next_del;
Eric Sandeen6873fa02008-10-07 00:46:36 -04005106}
Eric Sandeen6873fa02008-10-07 00:46:36 -04005107/* fiemap flags we can handle specified here */
5108#define EXT4_FIEMAP_FLAGS (FIEMAP_FLAG_SYNC|FIEMAP_FLAG_XATTR)
5109
Aneesh Kumar K.V3a06d772008-11-22 15:04:59 -05005110static int ext4_xattr_fiemap(struct inode *inode,
5111 struct fiemap_extent_info *fieinfo)
Eric Sandeen6873fa02008-10-07 00:46:36 -04005112{
5113 __u64 physical = 0;
5114 __u64 length;
5115 __u32 flags = FIEMAP_EXTENT_LAST;
5116 int blockbits = inode->i_sb->s_blocksize_bits;
5117 int error = 0;
5118
5119 /* in-inode? */
Theodore Ts'o19f5fb72010-01-24 14:34:07 -05005120 if (ext4_test_inode_state(inode, EXT4_STATE_XATTR)) {
Eric Sandeen6873fa02008-10-07 00:46:36 -04005121 struct ext4_iloc iloc;
5122 int offset; /* offset of xattr in inode */
5123
5124 error = ext4_get_inode_loc(inode, &iloc);
5125 if (error)
5126 return error;
Jan Karaa60697f2013-05-31 19:38:56 -04005127 physical = (__u64)iloc.bh->b_blocknr << blockbits;
Eric Sandeen6873fa02008-10-07 00:46:36 -04005128 offset = EXT4_GOOD_OLD_INODE_SIZE +
5129 EXT4_I(inode)->i_extra_isize;
5130 physical += offset;
5131 length = EXT4_SB(inode->i_sb)->s_inode_size - offset;
5132 flags |= FIEMAP_EXTENT_DATA_INLINE;
Curt Wohlgemuthfd2dd9f2010-04-03 17:44:16 -04005133 brelse(iloc.bh);
Eric Sandeen6873fa02008-10-07 00:46:36 -04005134 } else { /* external block */
Jan Karaa60697f2013-05-31 19:38:56 -04005135 physical = (__u64)EXT4_I(inode)->i_file_acl << blockbits;
Eric Sandeen6873fa02008-10-07 00:46:36 -04005136 length = inode->i_sb->s_blocksize;
5137 }
5138
5139 if (physical)
5140 error = fiemap_fill_next_extent(fieinfo, 0, physical,
5141 length, flags);
5142 return (error < 0 ? error : 0);
5143}
5144
5145int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
5146 __u64 start, __u64 len)
5147{
5148 ext4_lblk_t start_blk;
Eric Sandeen6873fa02008-10-07 00:46:36 -04005149 int error = 0;
5150
Tao Ma94191982012-12-10 14:06:02 -05005151 if (ext4_has_inline_data(inode)) {
5152 int has_inline = 1;
5153
Dmitry Monakhovd952d692014-12-02 16:11:20 -05005154 error = ext4_inline_data_fiemap(inode, fieinfo, &has_inline,
5155 start, len);
Tao Ma94191982012-12-10 14:06:02 -05005156
5157 if (has_inline)
5158 return error;
5159 }
5160
Theodore Ts'o7869a4a2013-08-16 22:05:14 -04005161 if (fieinfo->fi_flags & FIEMAP_FLAG_CACHE) {
5162 error = ext4_ext_precache(inode);
5163 if (error)
5164 return error;
5165 }
5166
Eric Sandeen6873fa02008-10-07 00:46:36 -04005167 /* fallback to generic here if not in extents fmt */
Dmitry Monakhov12e9b892010-05-16 22:00:00 -04005168 if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)))
Theodore Ts'oad7fefb2015-01-02 15:16:00 -05005169 return generic_block_fiemap(inode, fieinfo, start, len,
5170 ext4_get_block);
Eric Sandeen6873fa02008-10-07 00:46:36 -04005171
5172 if (fiemap_check_flags(fieinfo, EXT4_FIEMAP_FLAGS))
5173 return -EBADR;
5174
5175 if (fieinfo->fi_flags & FIEMAP_FLAG_XATTR) {
5176 error = ext4_xattr_fiemap(inode, fieinfo);
5177 } else {
Leonard Michlmayraca92ff2010-03-04 17:07:28 -05005178 ext4_lblk_t len_blks;
5179 __u64 last_blk;
5180
Eric Sandeen6873fa02008-10-07 00:46:36 -04005181 start_blk = start >> inode->i_sb->s_blocksize_bits;
Leonard Michlmayraca92ff2010-03-04 17:07:28 -05005182 last_blk = (start + len - 1) >> inode->i_sb->s_blocksize_bits;
Lukas Czernerf17722f2011-06-06 00:05:17 -04005183 if (last_blk >= EXT_MAX_BLOCKS)
5184 last_blk = EXT_MAX_BLOCKS-1;
Leonard Michlmayraca92ff2010-03-04 17:07:28 -05005185 len_blks = ((ext4_lblk_t) last_blk) - start_blk + 1;
Eric Sandeen6873fa02008-10-07 00:46:36 -04005186
5187 /*
Lukas Czerner91dd8c12012-11-28 12:32:26 -05005188 * Walk the extent tree gathering extent information
5189 * and pushing extents back to the user.
Eric Sandeen6873fa02008-10-07 00:46:36 -04005190 */
Lukas Czerner91dd8c12012-11-28 12:32:26 -05005191 error = ext4_fill_fiemap_extents(inode, start_blk,
5192 len_blks, fieinfo);
Eric Sandeen6873fa02008-10-07 00:46:36 -04005193 }
Eric Sandeen6873fa02008-10-07 00:46:36 -04005194 return error;
5195}
Namjae Jeon9eb79482014-02-23 15:18:59 -05005196
5197/*
5198 * ext4_access_path:
5199 * Function to access the path buffer for marking it dirty.
5200 * It also checks if there are sufficient credits left in the journal handle
5201 * to update path.
5202 */
5203static int
5204ext4_access_path(handle_t *handle, struct inode *inode,
5205 struct ext4_ext_path *path)
5206{
5207 int credits, err;
5208
5209 if (!ext4_handle_valid(handle))
5210 return 0;
5211
5212 /*
5213 * Check if need to extend journal credits
5214 * 3 for leaf, sb, and inode plus 2 (bmap and group
5215 * descriptor) for each block group; assume two block
5216 * groups
5217 */
5218 if (handle->h_buffer_credits < 7) {
5219 credits = ext4_writepage_trans_blocks(inode);
5220 err = ext4_ext_truncate_extend_restart(handle, inode, credits);
5221 /* EAGAIN is success */
5222 if (err && err != -EAGAIN)
5223 return err;
5224 }
5225
5226 err = ext4_ext_get_access(handle, inode, path);
5227 return err;
5228}
5229
5230/*
5231 * ext4_ext_shift_path_extents:
5232 * Shift the extents of a path structure lying between path[depth].p_ext
5233 * and EXT_LAST_EXTENT(path[depth].p_hdr) downwards, by subtracting shift
5234 * from starting block for each extent.
5235 */
5236static int
5237ext4_ext_shift_path_extents(struct ext4_ext_path *path, ext4_lblk_t shift,
5238 struct inode *inode, handle_t *handle,
5239 ext4_lblk_t *start)
5240{
5241 int depth, err = 0;
5242 struct ext4_extent *ex_start, *ex_last;
5243 bool update = 0;
5244 depth = path->p_depth;
5245
5246 while (depth >= 0) {
5247 if (depth == path->p_depth) {
5248 ex_start = path[depth].p_ext;
5249 if (!ex_start)
5250 return -EIO;
5251
5252 ex_last = EXT_LAST_EXTENT(path[depth].p_hdr);
Namjae Jeon9eb79482014-02-23 15:18:59 -05005253
5254 err = ext4_access_path(handle, inode, path + depth);
5255 if (err)
5256 goto out;
5257
5258 if (ex_start == EXT_FIRST_EXTENT(path[depth].p_hdr))
5259 update = 1;
5260
Zheng Liu847c6c42014-04-12 12:45:55 -04005261 *start = le32_to_cpu(ex_last->ee_block) +
Namjae Jeon9eb79482014-02-23 15:18:59 -05005262 ext4_ext_get_actual_len(ex_last);
5263
5264 while (ex_start <= ex_last) {
Zheng Liu847c6c42014-04-12 12:45:55 -04005265 le32_add_cpu(&ex_start->ee_block, -shift);
Lukas Czerner6dd834e2014-04-18 10:55:24 -04005266 /* Try to merge to the left. */
5267 if ((ex_start >
5268 EXT_FIRST_EXTENT(path[depth].p_hdr)) &&
5269 ext4_ext_try_to_merge_right(inode,
5270 path, ex_start - 1))
5271 ex_last--;
5272 else
5273 ex_start++;
Namjae Jeon9eb79482014-02-23 15:18:59 -05005274 }
5275 err = ext4_ext_dirty(handle, inode, path + depth);
5276 if (err)
5277 goto out;
5278
5279 if (--depth < 0 || !update)
5280 break;
5281 }
5282
5283 /* Update index too */
5284 err = ext4_access_path(handle, inode, path + depth);
5285 if (err)
5286 goto out;
5287
Zheng Liu847c6c42014-04-12 12:45:55 -04005288 le32_add_cpu(&path[depth].p_idx->ei_block, -shift);
Namjae Jeon9eb79482014-02-23 15:18:59 -05005289 err = ext4_ext_dirty(handle, inode, path + depth);
5290 if (err)
5291 goto out;
5292
5293 /* we are done if current index is not a starting index */
5294 if (path[depth].p_idx != EXT_FIRST_INDEX(path[depth].p_hdr))
5295 break;
5296
5297 depth--;
5298 }
5299
5300out:
5301 return err;
5302}
5303
5304/*
5305 * ext4_ext_shift_extents:
5306 * All the extents which lies in the range from start to the last allocated
5307 * block for the file are shifted downwards by shift blocks.
5308 * On success, 0 is returned, error otherwise.
5309 */
5310static int
5311ext4_ext_shift_extents(struct inode *inode, handle_t *handle,
5312 ext4_lblk_t start, ext4_lblk_t shift)
5313{
5314 struct ext4_ext_path *path;
5315 int ret = 0, depth;
5316 struct ext4_extent *extent;
Dmitry Monakhovf8fb4f42014-08-30 23:50:56 -04005317 ext4_lblk_t stop_block;
Namjae Jeon9eb79482014-02-23 15:18:59 -05005318 ext4_lblk_t ex_start, ex_end;
5319
5320 /* Let path point to the last extent */
Theodore Ts'oed8a1a72014-09-01 14:43:09 -04005321 path = ext4_find_extent(inode, EXT_MAX_BLOCKS - 1, NULL, 0);
Namjae Jeon9eb79482014-02-23 15:18:59 -05005322 if (IS_ERR(path))
5323 return PTR_ERR(path);
5324
5325 depth = path->p_depth;
5326 extent = path[depth].p_ext;
Theodore Ts'oee4bd0d92014-09-01 14:41:09 -04005327 if (!extent)
5328 goto out;
Namjae Jeon9eb79482014-02-23 15:18:59 -05005329
Zheng Liu847c6c42014-04-12 12:45:55 -04005330 stop_block = le32_to_cpu(extent->ee_block) +
5331 ext4_ext_get_actual_len(extent);
Namjae Jeon9eb79482014-02-23 15:18:59 -05005332
5333 /* Nothing to shift, if hole is at the end of file */
5334 if (start >= stop_block)
Theodore Ts'oee4bd0d92014-09-01 14:41:09 -04005335 goto out;
Namjae Jeon9eb79482014-02-23 15:18:59 -05005336
5337 /*
5338 * Don't start shifting extents until we make sure the hole is big
5339 * enough to accomodate the shift.
5340 */
Theodore Ts'oed8a1a72014-09-01 14:43:09 -04005341 path = ext4_find_extent(inode, start - 1, &path, 0);
Dmitry Monakhov8dc79ec2014-04-13 15:05:42 -04005342 if (IS_ERR(path))
5343 return PTR_ERR(path);
Namjae Jeon9eb79482014-02-23 15:18:59 -05005344 depth = path->p_depth;
5345 extent = path[depth].p_ext;
Dmitry Monakhov8dc79ec2014-04-13 15:05:42 -04005346 if (extent) {
5347 ex_start = le32_to_cpu(extent->ee_block);
5348 ex_end = le32_to_cpu(extent->ee_block) +
Zheng Liu847c6c42014-04-12 12:45:55 -04005349 ext4_ext_get_actual_len(extent);
Dmitry Monakhov8dc79ec2014-04-13 15:05:42 -04005350 } else {
5351 ex_start = 0;
5352 ex_end = 0;
5353 }
Namjae Jeon9eb79482014-02-23 15:18:59 -05005354
5355 if ((start == ex_start && shift > ex_start) ||
5356 (shift > start - ex_end))
5357 return -EINVAL;
5358
5359 /* Its safe to start updating extents */
5360 while (start < stop_block) {
Theodore Ts'oed8a1a72014-09-01 14:43:09 -04005361 path = ext4_find_extent(inode, start, &path, 0);
Namjae Jeon9eb79482014-02-23 15:18:59 -05005362 if (IS_ERR(path))
5363 return PTR_ERR(path);
5364 depth = path->p_depth;
5365 extent = path[depth].p_ext;
Dmitry Monakhova18ed352014-04-13 15:41:13 -04005366 if (!extent) {
5367 EXT4_ERROR_INODE(inode, "unexpected hole at %lu",
5368 (unsigned long) start);
5369 return -EIO;
5370 }
Dmitry Monakhovf8fb4f42014-08-30 23:50:56 -04005371 if (start > le32_to_cpu(extent->ee_block)) {
Namjae Jeon9eb79482014-02-23 15:18:59 -05005372 /* Hole, move to the next extent */
Dmitry Monakhovf8fb4f42014-08-30 23:50:56 -04005373 if (extent < EXT_LAST_EXTENT(path[depth].p_hdr)) {
5374 path[depth].p_ext++;
5375 } else {
5376 start = ext4_ext_next_allocated_block(path);
Dmitry Monakhovf8fb4f42014-08-30 23:50:56 -04005377 continue;
Namjae Jeon9eb79482014-02-23 15:18:59 -05005378 }
5379 }
5380 ret = ext4_ext_shift_path_extents(path, shift, inode,
5381 handle, &start);
Namjae Jeon9eb79482014-02-23 15:18:59 -05005382 if (ret)
5383 break;
5384 }
Theodore Ts'oee4bd0d92014-09-01 14:41:09 -04005385out:
5386 ext4_ext_drop_refs(path);
5387 kfree(path);
Namjae Jeon9eb79482014-02-23 15:18:59 -05005388 return ret;
5389}
5390
5391/*
5392 * ext4_collapse_range:
5393 * This implements the fallocate's collapse range functionality for ext4
5394 * Returns: 0 and non-zero on error.
5395 */
5396int ext4_collapse_range(struct inode *inode, loff_t offset, loff_t len)
5397{
5398 struct super_block *sb = inode->i_sb;
5399 ext4_lblk_t punch_start, punch_stop;
5400 handle_t *handle;
5401 unsigned int credits;
Namjae Jeona8680e02014-04-19 16:37:31 -04005402 loff_t new_size, ioffset;
Namjae Jeon9eb79482014-02-23 15:18:59 -05005403 int ret;
5404
Namjae Jeon9eb79482014-02-23 15:18:59 -05005405 /* Collapse range works only on fs block size aligned offsets. */
Namjae Jeonee98fa32014-07-29 10:45:31 -04005406 if (offset & (EXT4_CLUSTER_SIZE(sb) - 1) ||
5407 len & (EXT4_CLUSTER_SIZE(sb) - 1))
Namjae Jeon9eb79482014-02-23 15:18:59 -05005408 return -EINVAL;
5409
5410 if (!S_ISREG(inode->i_mode))
Theodore Ts'o86f1ca32014-04-18 11:52:11 -04005411 return -EINVAL;
Namjae Jeon9eb79482014-02-23 15:18:59 -05005412
5413 trace_ext4_collapse_range(inode, offset, len);
5414
5415 punch_start = offset >> EXT4_BLOCK_SIZE_BITS(sb);
5416 punch_stop = (offset + len) >> EXT4_BLOCK_SIZE_BITS(sb);
5417
Namjae Jeon1ce01c42014-04-10 22:58:20 -04005418 /* Call ext4_force_commit to flush all data in case of data=journal. */
5419 if (ext4_should_journal_data(inode)) {
5420 ret = ext4_force_commit(inode->i_sb);
5421 if (ret)
5422 return ret;
5423 }
5424
Namjae Jeona8680e02014-04-19 16:37:31 -04005425 /*
5426 * Need to round down offset to be aligned with page size boundary
5427 * for page size > block size.
5428 */
5429 ioffset = round_down(offset, PAGE_SIZE);
5430
Namjae Jeon9eb79482014-02-23 15:18:59 -05005431 /* Write out all dirty pages */
Namjae Jeona8680e02014-04-19 16:37:31 -04005432 ret = filemap_write_and_wait_range(inode->i_mapping, ioffset,
5433 LLONG_MAX);
Namjae Jeon9eb79482014-02-23 15:18:59 -05005434 if (ret)
5435 return ret;
5436
5437 /* Take mutex lock */
5438 mutex_lock(&inode->i_mutex);
5439
Lukas Czerner23fffa92014-04-12 09:56:41 -04005440 /*
5441 * There is no need to overlap collapse range with EOF, in which case
5442 * it is effectively a truncate operation
5443 */
5444 if (offset + len >= i_size_read(inode)) {
5445 ret = -EINVAL;
5446 goto out_mutex;
5447 }
5448
Namjae Jeon9eb79482014-02-23 15:18:59 -05005449 /* Currently just for extent based files */
5450 if (!ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)) {
5451 ret = -EOPNOTSUPP;
5452 goto out_mutex;
5453 }
5454
Namjae Jeona8680e02014-04-19 16:37:31 -04005455 truncate_pagecache(inode, ioffset);
Namjae Jeon9eb79482014-02-23 15:18:59 -05005456
5457 /* Wait for existing dio to complete */
5458 ext4_inode_block_unlocked_dio(inode);
5459 inode_dio_wait(inode);
5460
5461 credits = ext4_writepage_trans_blocks(inode);
5462 handle = ext4_journal_start(inode, EXT4_HT_TRUNCATE, credits);
5463 if (IS_ERR(handle)) {
5464 ret = PTR_ERR(handle);
5465 goto out_dio;
5466 }
5467
5468 down_write(&EXT4_I(inode)->i_data_sem);
5469 ext4_discard_preallocations(inode);
5470
5471 ret = ext4_es_remove_extent(inode, punch_start,
Lukas Czerner2c1d2322014-04-18 10:43:21 -04005472 EXT_MAX_BLOCKS - punch_start);
Namjae Jeon9eb79482014-02-23 15:18:59 -05005473 if (ret) {
5474 up_write(&EXT4_I(inode)->i_data_sem);
5475 goto out_stop;
5476 }
5477
5478 ret = ext4_ext_remove_space(inode, punch_start, punch_stop - 1);
5479 if (ret) {
5480 up_write(&EXT4_I(inode)->i_data_sem);
5481 goto out_stop;
5482 }
Lukas Czerneref24f6c2014-04-18 10:50:23 -04005483 ext4_discard_preallocations(inode);
Namjae Jeon9eb79482014-02-23 15:18:59 -05005484
5485 ret = ext4_ext_shift_extents(inode, handle, punch_stop,
5486 punch_stop - punch_start);
5487 if (ret) {
5488 up_write(&EXT4_I(inode)->i_data_sem);
5489 goto out_stop;
5490 }
5491
5492 new_size = i_size_read(inode) - len;
Lukas Czerner9337d5d2014-04-18 10:48:25 -04005493 i_size_write(inode, new_size);
Namjae Jeon9eb79482014-02-23 15:18:59 -05005494 EXT4_I(inode)->i_disksize = new_size;
5495
Namjae Jeon9eb79482014-02-23 15:18:59 -05005496 up_write(&EXT4_I(inode)->i_data_sem);
5497 if (IS_SYNC(inode))
5498 ext4_handle_sync(handle);
5499 inode->i_mtime = inode->i_ctime = ext4_current_time(inode);
5500 ext4_mark_inode_dirty(handle, inode);
5501
5502out_stop:
5503 ext4_journal_stop(handle);
5504out_dio:
5505 ext4_inode_resume_unlocked_dio(inode);
5506out_mutex:
5507 mutex_unlock(&inode->i_mutex);
5508 return ret;
5509}
Dmitry Monakhovfcf6b1b72014-08-30 23:52:19 -04005510
5511/**
5512 * ext4_swap_extents - Swap extents between two inodes
5513 *
5514 * @inode1: First inode
5515 * @inode2: Second inode
5516 * @lblk1: Start block for first inode
5517 * @lblk2: Start block for second inode
5518 * @count: Number of blocks to swap
5519 * @mark_unwritten: Mark second inode's extents as unwritten after swap
5520 * @erp: Pointer to save error value
5521 *
5522 * This helper routine does exactly what is promise "swap extents". All other
5523 * stuff such as page-cache locking consistency, bh mapping consistency or
5524 * extent's data copying must be performed by caller.
5525 * Locking:
5526 * i_mutex is held for both inodes
5527 * i_data_sem is locked for write for both inodes
5528 * Assumptions:
5529 * All pages from requested range are locked for both inodes
5530 */
5531int
5532ext4_swap_extents(handle_t *handle, struct inode *inode1,
5533 struct inode *inode2, ext4_lblk_t lblk1, ext4_lblk_t lblk2,
5534 ext4_lblk_t count, int unwritten, int *erp)
5535{
5536 struct ext4_ext_path *path1 = NULL;
5537 struct ext4_ext_path *path2 = NULL;
5538 int replaced_count = 0;
5539
5540 BUG_ON(!rwsem_is_locked(&EXT4_I(inode1)->i_data_sem));
5541 BUG_ON(!rwsem_is_locked(&EXT4_I(inode2)->i_data_sem));
5542 BUG_ON(!mutex_is_locked(&inode1->i_mutex));
5543 BUG_ON(!mutex_is_locked(&inode1->i_mutex));
5544
5545 *erp = ext4_es_remove_extent(inode1, lblk1, count);
Theodore Ts'o19008f62014-08-31 15:03:14 -04005546 if (unlikely(*erp))
Dmitry Monakhovfcf6b1b72014-08-30 23:52:19 -04005547 return 0;
5548 *erp = ext4_es_remove_extent(inode2, lblk2, count);
Theodore Ts'o19008f62014-08-31 15:03:14 -04005549 if (unlikely(*erp))
Dmitry Monakhovfcf6b1b72014-08-30 23:52:19 -04005550 return 0;
5551
5552 while (count) {
5553 struct ext4_extent *ex1, *ex2, tmp_ex;
5554 ext4_lblk_t e1_blk, e2_blk;
5555 int e1_len, e2_len, len;
5556 int split = 0;
5557
Theodore Ts'oed8a1a72014-09-01 14:43:09 -04005558 path1 = ext4_find_extent(inode1, lblk1, NULL, EXT4_EX_NOCACHE);
Theodore Ts'o19008f62014-08-31 15:03:14 -04005559 if (unlikely(IS_ERR(path1))) {
Dmitry Monakhovfcf6b1b72014-08-30 23:52:19 -04005560 *erp = PTR_ERR(path1);
Theodore Ts'o19008f62014-08-31 15:03:14 -04005561 path1 = NULL;
5562 finish:
5563 count = 0;
5564 goto repeat;
Dmitry Monakhovfcf6b1b72014-08-30 23:52:19 -04005565 }
Theodore Ts'oed8a1a72014-09-01 14:43:09 -04005566 path2 = ext4_find_extent(inode2, lblk2, NULL, EXT4_EX_NOCACHE);
Theodore Ts'o19008f62014-08-31 15:03:14 -04005567 if (unlikely(IS_ERR(path2))) {
Dmitry Monakhovfcf6b1b72014-08-30 23:52:19 -04005568 *erp = PTR_ERR(path2);
Theodore Ts'o19008f62014-08-31 15:03:14 -04005569 path2 = NULL;
5570 goto finish;
Dmitry Monakhovfcf6b1b72014-08-30 23:52:19 -04005571 }
5572 ex1 = path1[path1->p_depth].p_ext;
5573 ex2 = path2[path2->p_depth].p_ext;
5574 /* Do we have somthing to swap ? */
5575 if (unlikely(!ex2 || !ex1))
Theodore Ts'o19008f62014-08-31 15:03:14 -04005576 goto finish;
Dmitry Monakhovfcf6b1b72014-08-30 23:52:19 -04005577
5578 e1_blk = le32_to_cpu(ex1->ee_block);
5579 e2_blk = le32_to_cpu(ex2->ee_block);
5580 e1_len = ext4_ext_get_actual_len(ex1);
5581 e2_len = ext4_ext_get_actual_len(ex2);
5582
5583 /* Hole handling */
5584 if (!in_range(lblk1, e1_blk, e1_len) ||
5585 !in_range(lblk2, e2_blk, e2_len)) {
5586 ext4_lblk_t next1, next2;
5587
5588 /* if hole after extent, then go to next extent */
5589 next1 = ext4_ext_next_allocated_block(path1);
5590 next2 = ext4_ext_next_allocated_block(path2);
5591 /* If hole before extent, then shift to that extent */
5592 if (e1_blk > lblk1)
5593 next1 = e1_blk;
5594 if (e2_blk > lblk2)
5595 next2 = e1_blk;
5596 /* Do we have something to swap */
5597 if (next1 == EXT_MAX_BLOCKS || next2 == EXT_MAX_BLOCKS)
Theodore Ts'o19008f62014-08-31 15:03:14 -04005598 goto finish;
Dmitry Monakhovfcf6b1b72014-08-30 23:52:19 -04005599 /* Move to the rightest boundary */
5600 len = next1 - lblk1;
5601 if (len < next2 - lblk2)
5602 len = next2 - lblk2;
5603 if (len > count)
5604 len = count;
5605 lblk1 += len;
5606 lblk2 += len;
5607 count -= len;
5608 goto repeat;
5609 }
5610
5611 /* Prepare left boundary */
5612 if (e1_blk < lblk1) {
5613 split = 1;
5614 *erp = ext4_force_split_extent_at(handle, inode1,
Theodore Ts'odfe50802014-09-01 14:37:09 -04005615 &path1, lblk1, 0);
Theodore Ts'o19008f62014-08-31 15:03:14 -04005616 if (unlikely(*erp))
5617 goto finish;
Dmitry Monakhovfcf6b1b72014-08-30 23:52:19 -04005618 }
5619 if (e2_blk < lblk2) {
5620 split = 1;
5621 *erp = ext4_force_split_extent_at(handle, inode2,
Theodore Ts'odfe50802014-09-01 14:37:09 -04005622 &path2, lblk2, 0);
Theodore Ts'o19008f62014-08-31 15:03:14 -04005623 if (unlikely(*erp))
5624 goto finish;
Dmitry Monakhovfcf6b1b72014-08-30 23:52:19 -04005625 }
Theodore Ts'odfe50802014-09-01 14:37:09 -04005626 /* ext4_split_extent_at() may result in leaf extent split,
Dmitry Monakhovfcf6b1b72014-08-30 23:52:19 -04005627 * path must to be revalidated. */
5628 if (split)
5629 goto repeat;
5630
5631 /* Prepare right boundary */
5632 len = count;
5633 if (len > e1_blk + e1_len - lblk1)
5634 len = e1_blk + e1_len - lblk1;
5635 if (len > e2_blk + e2_len - lblk2)
5636 len = e2_blk + e2_len - lblk2;
5637
5638 if (len != e1_len) {
5639 split = 1;
5640 *erp = ext4_force_split_extent_at(handle, inode1,
Theodore Ts'odfe50802014-09-01 14:37:09 -04005641 &path1, lblk1 + len, 0);
Theodore Ts'o19008f62014-08-31 15:03:14 -04005642 if (unlikely(*erp))
5643 goto finish;
Dmitry Monakhovfcf6b1b72014-08-30 23:52:19 -04005644 }
5645 if (len != e2_len) {
5646 split = 1;
5647 *erp = ext4_force_split_extent_at(handle, inode2,
Theodore Ts'odfe50802014-09-01 14:37:09 -04005648 &path2, lblk2 + len, 0);
Dmitry Monakhovfcf6b1b72014-08-30 23:52:19 -04005649 if (*erp)
Theodore Ts'o19008f62014-08-31 15:03:14 -04005650 goto finish;
Dmitry Monakhovfcf6b1b72014-08-30 23:52:19 -04005651 }
Theodore Ts'odfe50802014-09-01 14:37:09 -04005652 /* ext4_split_extent_at() may result in leaf extent split,
Dmitry Monakhovfcf6b1b72014-08-30 23:52:19 -04005653 * path must to be revalidated. */
5654 if (split)
5655 goto repeat;
5656
5657 BUG_ON(e2_len != e1_len);
5658 *erp = ext4_ext_get_access(handle, inode1, path1 + path1->p_depth);
Theodore Ts'o19008f62014-08-31 15:03:14 -04005659 if (unlikely(*erp))
5660 goto finish;
Dmitry Monakhovfcf6b1b72014-08-30 23:52:19 -04005661 *erp = ext4_ext_get_access(handle, inode2, path2 + path2->p_depth);
Theodore Ts'o19008f62014-08-31 15:03:14 -04005662 if (unlikely(*erp))
5663 goto finish;
Dmitry Monakhovfcf6b1b72014-08-30 23:52:19 -04005664
5665 /* Both extents are fully inside boundaries. Swap it now */
5666 tmp_ex = *ex1;
5667 ext4_ext_store_pblock(ex1, ext4_ext_pblock(ex2));
5668 ext4_ext_store_pblock(ex2, ext4_ext_pblock(&tmp_ex));
5669 ex1->ee_len = cpu_to_le16(e2_len);
5670 ex2->ee_len = cpu_to_le16(e1_len);
5671 if (unwritten)
5672 ext4_ext_mark_unwritten(ex2);
5673 if (ext4_ext_is_unwritten(&tmp_ex))
5674 ext4_ext_mark_unwritten(ex1);
5675
5676 ext4_ext_try_to_merge(handle, inode2, path2, ex2);
5677 ext4_ext_try_to_merge(handle, inode1, path1, ex1);
5678 *erp = ext4_ext_dirty(handle, inode2, path2 +
5679 path2->p_depth);
Theodore Ts'o19008f62014-08-31 15:03:14 -04005680 if (unlikely(*erp))
5681 goto finish;
Dmitry Monakhovfcf6b1b72014-08-30 23:52:19 -04005682 *erp = ext4_ext_dirty(handle, inode1, path1 +
5683 path1->p_depth);
5684 /*
5685 * Looks scarry ah..? second inode already points to new blocks,
5686 * and it was successfully dirtied. But luckily error may happen
5687 * only due to journal error, so full transaction will be
5688 * aborted anyway.
5689 */
Theodore Ts'o19008f62014-08-31 15:03:14 -04005690 if (unlikely(*erp))
5691 goto finish;
Dmitry Monakhovfcf6b1b72014-08-30 23:52:19 -04005692 lblk1 += len;
5693 lblk2 += len;
5694 replaced_count += len;
5695 count -= len;
5696
5697 repeat:
Theodore Ts'ob7ea89a2014-09-01 14:39:09 -04005698 ext4_ext_drop_refs(path1);
5699 kfree(path1);
5700 ext4_ext_drop_refs(path2);
5701 kfree(path2);
5702 path1 = path2 = NULL;
Dmitry Monakhovfcf6b1b72014-08-30 23:52:19 -04005703 }
Dmitry Monakhovfcf6b1b72014-08-30 23:52:19 -04005704 return replaced_count;
5705}