blob: ccdd2afc546e20e18430a3be4460384e723aa9ee [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
76 if (!EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb,
77 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
78 return 1;
79
80 et = find_ext4_extent_tail(eh);
81 if (et->et_checksum != ext4_extent_block_csum(inode, eh))
82 return 0;
83 return 1;
84}
85
86static void ext4_extent_block_csum_set(struct inode *inode,
87 struct ext4_extent_header *eh)
88{
89 struct ext4_extent_tail *et;
90
91 if (!EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb,
92 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
93 return;
94
95 et = find_ext4_extent_tail(eh);
96 et->et_checksum = ext4_extent_block_csum(inode, eh);
97}
98
Allison Hendersond583fb82011-05-25 07:41:43 -040099static int ext4_split_extent(handle_t *handle,
100 struct inode *inode,
Theodore Ts'odfe50802014-09-01 14:37:09 -0400101 struct ext4_ext_path **ppath,
Allison Hendersond583fb82011-05-25 07:41:43 -0400102 struct ext4_map_blocks *map,
103 int split_flag,
104 int flags);
105
Lukas Czerner5f95d212012-03-19 23:03:19 -0400106static int ext4_split_extent_at(handle_t *handle,
107 struct inode *inode,
Theodore Ts'odfe50802014-09-01 14:37:09 -0400108 struct ext4_ext_path **ppath,
Lukas Czerner5f95d212012-03-19 23:03:19 -0400109 ext4_lblk_t split,
110 int split_flag,
111 int flags);
112
Lukas Czerner91dd8c12012-11-28 12:32:26 -0500113static int ext4_find_delayed_extent(struct inode *inode,
Zheng Liu69eb33d2013-02-18 00:31:07 -0500114 struct extent_status *newes);
Lukas Czerner91dd8c12012-11-28 12:32:26 -0500115
Jan Kara487caee2009-08-17 22:17:20 -0400116static int ext4_ext_truncate_extend_restart(handle_t *handle,
117 struct inode *inode,
118 int needed)
Alex Tomasa86c6182006-10-11 01:21:03 -0700119{
120 int err;
121
Frank Mayhar03901312009-01-07 00:06:22 -0500122 if (!ext4_handle_valid(handle))
123 return 0;
Alex Tomasa86c6182006-10-11 01:21:03 -0700124 if (handle->h_buffer_credits > needed)
Shen Feng9102e4f2008-07-11 19:27:31 -0400125 return 0;
126 err = ext4_journal_extend(handle, needed);
Theodore Ts'o0123c932008-08-01 20:57:54 -0400127 if (err <= 0)
Shen Feng9102e4f2008-07-11 19:27:31 -0400128 return err;
Jan Kara487caee2009-08-17 22:17:20 -0400129 err = ext4_truncate_restart_trans(handle, inode, needed);
Dmitry Monakhov0617b832010-05-17 01:00:00 -0400130 if (err == 0)
131 err = -EAGAIN;
Jan Kara487caee2009-08-17 22:17:20 -0400132
133 return err;
Alex Tomasa86c6182006-10-11 01:21:03 -0700134}
135
136/*
137 * could return:
138 * - EROFS
139 * - ENOMEM
140 */
141static int ext4_ext_get_access(handle_t *handle, struct inode *inode,
142 struct ext4_ext_path *path)
143{
144 if (path->p_bh) {
145 /* path points to block */
liang xie5d601252014-05-12 22:06:43 -0400146 BUFFER_TRACE(path->p_bh, "get_write_access");
Alex Tomasa86c6182006-10-11 01:21:03 -0700147 return ext4_journal_get_write_access(handle, path->p_bh);
148 }
149 /* path points to leaf/index in inode body */
150 /* we use in-core data, no need to protect them */
151 return 0;
152}
153
154/*
155 * could return:
156 * - EROFS
157 * - ENOMEM
158 * - EIO
159 */
Darrick J. Wong26564972013-04-19 14:04:12 -0400160int __ext4_ext_dirty(const char *where, unsigned int line, handle_t *handle,
161 struct inode *inode, struct ext4_ext_path *path)
Alex Tomasa86c6182006-10-11 01:21:03 -0700162{
163 int err;
Dmitry Monakhov4b1f1662014-07-27 22:28:15 -0400164
165 WARN_ON(!rwsem_is_locked(&EXT4_I(inode)->i_data_sem));
Alex Tomasa86c6182006-10-11 01:21:03 -0700166 if (path->p_bh) {
Darrick J. Wong7ac59902012-04-29 18:37:10 -0400167 ext4_extent_block_csum_set(inode, ext_block_hdr(path->p_bh));
Alex Tomasa86c6182006-10-11 01:21:03 -0700168 /* path points to block */
Theodore Ts'o9ea7a0d2011-09-04 10:18:14 -0400169 err = __ext4_handle_dirty_metadata(where, line, handle,
170 inode, path->p_bh);
Alex Tomasa86c6182006-10-11 01:21:03 -0700171 } else {
172 /* path points to leaf/index in inode body */
173 err = ext4_mark_inode_dirty(handle, inode);
174 }
175 return err;
176}
177
Alex Tomasf65e6fb2006-10-11 01:21:05 -0700178static ext4_fsblk_t ext4_ext_find_goal(struct inode *inode,
Alex Tomasa86c6182006-10-11 01:21:03 -0700179 struct ext4_ext_path *path,
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -0500180 ext4_lblk_t block)
Alex Tomasa86c6182006-10-11 01:21:03 -0700181{
Alex Tomasa86c6182006-10-11 01:21:03 -0700182 if (path) {
Yongqiang Yang81fdbb42011-10-29 09:23:38 -0400183 int depth = path->p_depth;
Alex Tomasa86c6182006-10-11 01:21:03 -0700184 struct ext4_extent *ex;
Alex Tomasa86c6182006-10-11 01:21:03 -0700185
Kazuya Mioad4fb9c2011-01-10 12:12:28 -0500186 /*
187 * Try to predict block placement assuming that we are
188 * filling in a file which will eventually be
189 * non-sparse --- i.e., in the case of libbfd writing
190 * an ELF object sections out-of-order but in a way
191 * the eventually results in a contiguous object or
192 * executable file, or some database extending a table
193 * space file. However, this is actually somewhat
194 * non-ideal if we are writing a sparse file such as
195 * qemu or KVM writing a raw image file that is going
196 * to stay fairly sparse, since it will end up
197 * fragmenting the file system's free space. Maybe we
198 * should have some hueristics or some way to allow
199 * userspace to pass a hint to file system,
Tao Mab8d65682011-01-21 23:21:31 +0800200 * especially if the latter case turns out to be
Kazuya Mioad4fb9c2011-01-10 12:12:28 -0500201 * common.
202 */
Avantika Mathur7e028972006-12-06 20:41:33 -0800203 ex = path[depth].p_ext;
Kazuya Mioad4fb9c2011-01-10 12:12:28 -0500204 if (ex) {
205 ext4_fsblk_t ext_pblk = ext4_ext_pblock(ex);
206 ext4_lblk_t ext_block = le32_to_cpu(ex->ee_block);
207
208 if (block > ext_block)
209 return ext_pblk + (block - ext_block);
210 else
211 return ext_pblk - (ext_block - block);
212 }
Alex Tomasa86c6182006-10-11 01:21:03 -0700213
Randy Dunlapd0d856e2006-10-11 01:21:07 -0700214 /* it looks like index is empty;
215 * try to find starting block from index itself */
Alex Tomasa86c6182006-10-11 01:21:03 -0700216 if (path[depth].p_bh)
217 return path[depth].p_bh->b_blocknr;
218 }
219
220 /* OK. use inode's group */
Eric Sandeenf86186b2011-06-28 10:01:31 -0400221 return ext4_inode_to_goal_block(inode);
Alex Tomasa86c6182006-10-11 01:21:03 -0700222}
223
Aneesh Kumar K.V654b4902008-07-11 19:27:31 -0400224/*
225 * Allocation for a meta data block
226 */
Alex Tomasf65e6fb2006-10-11 01:21:05 -0700227static ext4_fsblk_t
Aneesh Kumar K.V654b4902008-07-11 19:27:31 -0400228ext4_ext_new_meta_block(handle_t *handle, struct inode *inode,
Alex Tomasa86c6182006-10-11 01:21:03 -0700229 struct ext4_ext_path *path,
Allison Henderson55f020d2011-05-25 07:41:26 -0400230 struct ext4_extent *ex, int *err, unsigned int flags)
Alex Tomasa86c6182006-10-11 01:21:03 -0700231{
Alex Tomasf65e6fb2006-10-11 01:21:05 -0700232 ext4_fsblk_t goal, newblock;
Alex Tomasa86c6182006-10-11 01:21:03 -0700233
234 goal = ext4_ext_find_goal(inode, path, le32_to_cpu(ex->ee_block));
Allison Henderson55f020d2011-05-25 07:41:26 -0400235 newblock = ext4_new_meta_blocks(handle, inode, goal, flags,
236 NULL, err);
Alex Tomasa86c6182006-10-11 01:21:03 -0700237 return newblock;
238}
239
Theodore Ts'o55ad63b2009-08-28 10:40:33 -0400240static inline int ext4_ext_space_block(struct inode *inode, int check)
Alex Tomasa86c6182006-10-11 01:21:03 -0700241{
242 int size;
243
244 size = (inode->i_sb->s_blocksize - sizeof(struct ext4_extent_header))
245 / sizeof(struct ext4_extent);
Robert P. J. Daybbf2f9f2007-02-17 19:20:16 +0100246#ifdef AGGRESSIVE_TEST
Yongqiang Yang02dc62fb2011-10-29 09:29:11 -0400247 if (!check && size > 6)
248 size = 6;
Alex Tomasa86c6182006-10-11 01:21:03 -0700249#endif
250 return size;
251}
252
Theodore Ts'o55ad63b2009-08-28 10:40:33 -0400253static inline int ext4_ext_space_block_idx(struct inode *inode, int check)
Alex Tomasa86c6182006-10-11 01:21:03 -0700254{
255 int size;
256
257 size = (inode->i_sb->s_blocksize - sizeof(struct ext4_extent_header))
258 / sizeof(struct ext4_extent_idx);
Robert P. J. Daybbf2f9f2007-02-17 19:20:16 +0100259#ifdef AGGRESSIVE_TEST
Yongqiang Yang02dc62fb2011-10-29 09:29:11 -0400260 if (!check && size > 5)
261 size = 5;
Alex Tomasa86c6182006-10-11 01:21:03 -0700262#endif
263 return size;
264}
265
Theodore Ts'o55ad63b2009-08-28 10:40:33 -0400266static inline int ext4_ext_space_root(struct inode *inode, int check)
Alex Tomasa86c6182006-10-11 01:21:03 -0700267{
268 int size;
269
270 size = sizeof(EXT4_I(inode)->i_data);
271 size -= sizeof(struct ext4_extent_header);
272 size /= sizeof(struct ext4_extent);
Robert P. J. Daybbf2f9f2007-02-17 19:20:16 +0100273#ifdef AGGRESSIVE_TEST
Yongqiang Yang02dc62fb2011-10-29 09:29:11 -0400274 if (!check && size > 3)
275 size = 3;
Alex Tomasa86c6182006-10-11 01:21:03 -0700276#endif
277 return size;
278}
279
Theodore Ts'o55ad63b2009-08-28 10:40:33 -0400280static inline int ext4_ext_space_root_idx(struct inode *inode, int check)
Alex Tomasa86c6182006-10-11 01:21:03 -0700281{
282 int size;
283
284 size = sizeof(EXT4_I(inode)->i_data);
285 size -= sizeof(struct ext4_extent_header);
286 size /= sizeof(struct ext4_extent_idx);
Robert P. J. Daybbf2f9f2007-02-17 19:20:16 +0100287#ifdef AGGRESSIVE_TEST
Yongqiang Yang02dc62fb2011-10-29 09:29:11 -0400288 if (!check && size > 4)
289 size = 4;
Alex Tomasa86c6182006-10-11 01:21:03 -0700290#endif
291 return size;
292}
293
Dmitry Monakhovfcf6b1b72014-08-30 23:52:19 -0400294static inline int
295ext4_force_split_extent_at(handle_t *handle, struct inode *inode,
Theodore Ts'odfe50802014-09-01 14:37:09 -0400296 struct ext4_ext_path **ppath, ext4_lblk_t lblk,
Dmitry Monakhovfcf6b1b72014-08-30 23:52:19 -0400297 int nofail)
298{
Theodore Ts'odfe50802014-09-01 14:37:09 -0400299 struct ext4_ext_path *path = *ppath;
Dmitry Monakhovfcf6b1b72014-08-30 23:52:19 -0400300 int unwritten = ext4_ext_is_unwritten(path[path->p_depth].p_ext);
301
Theodore Ts'odfe50802014-09-01 14:37:09 -0400302 return ext4_split_extent_at(handle, inode, ppath, lblk, unwritten ?
Dmitry Monakhovfcf6b1b72014-08-30 23:52:19 -0400303 EXT4_EXT_MARK_UNWRIT1|EXT4_EXT_MARK_UNWRIT2 : 0,
304 EXT4_EX_NOCACHE | EXT4_GET_BLOCKS_PRE_IO |
305 (nofail ? EXT4_GET_BLOCKS_METADATA_NOFAIL:0));
306}
307
Mingming Caod2a17632008-07-14 17:52:37 -0400308/*
309 * Calculate the number of metadata blocks needed
310 * to allocate @blocks
311 * Worse case is one block per extent
312 */
Theodore Ts'o01f49d02011-01-10 12:13:03 -0500313int ext4_ext_calc_metadata_amount(struct inode *inode, ext4_lblk_t lblock)
Mingming Caod2a17632008-07-14 17:52:37 -0400314{
Theodore Ts'o9d0be502010-01-01 02:41:30 -0500315 struct ext4_inode_info *ei = EXT4_I(inode);
Yongqiang Yang81fdbb42011-10-29 09:23:38 -0400316 int idxs;
Mingming Caod2a17632008-07-14 17:52:37 -0400317
Theodore Ts'o9d0be502010-01-01 02:41:30 -0500318 idxs = ((inode->i_sb->s_blocksize - sizeof(struct ext4_extent_header))
319 / sizeof(struct ext4_extent_idx));
Mingming Caod2a17632008-07-14 17:52:37 -0400320
321 /*
Theodore Ts'o9d0be502010-01-01 02:41:30 -0500322 * If the new delayed allocation block is contiguous with the
323 * previous da block, it can share index blocks with the
324 * previous block, so we only need to allocate a new index
325 * block every idxs leaf blocks. At ldxs**2 blocks, we need
326 * an additional index block, and at ldxs**3 blocks, yet
327 * another index blocks.
Mingming Caod2a17632008-07-14 17:52:37 -0400328 */
Theodore Ts'o9d0be502010-01-01 02:41:30 -0500329 if (ei->i_da_metadata_calc_len &&
330 ei->i_da_metadata_calc_last_lblock+1 == lblock) {
Yongqiang Yang81fdbb42011-10-29 09:23:38 -0400331 int num = 0;
332
Theodore Ts'o9d0be502010-01-01 02:41:30 -0500333 if ((ei->i_da_metadata_calc_len % idxs) == 0)
334 num++;
335 if ((ei->i_da_metadata_calc_len % (idxs*idxs)) == 0)
336 num++;
337 if ((ei->i_da_metadata_calc_len % (idxs*idxs*idxs)) == 0) {
338 num++;
339 ei->i_da_metadata_calc_len = 0;
340 } else
341 ei->i_da_metadata_calc_len++;
342 ei->i_da_metadata_calc_last_lblock++;
343 return num;
344 }
Mingming Caod2a17632008-07-14 17:52:37 -0400345
Theodore Ts'o9d0be502010-01-01 02:41:30 -0500346 /*
347 * In the worst case we need a new set of index blocks at
348 * every level of the inode's extent tree.
349 */
350 ei->i_da_metadata_calc_len = 1;
351 ei->i_da_metadata_calc_last_lblock = lblock;
352 return ext_depth(inode) + 1;
Mingming Caod2a17632008-07-14 17:52:37 -0400353}
354
Alex Tomasc29c0ae2007-07-18 09:19:09 -0400355static int
356ext4_ext_max_entries(struct inode *inode, int depth)
357{
358 int max;
359
360 if (depth == ext_depth(inode)) {
361 if (depth == 0)
Theodore Ts'o55ad63b2009-08-28 10:40:33 -0400362 max = ext4_ext_space_root(inode, 1);
Alex Tomasc29c0ae2007-07-18 09:19:09 -0400363 else
Theodore Ts'o55ad63b2009-08-28 10:40:33 -0400364 max = ext4_ext_space_root_idx(inode, 1);
Alex Tomasc29c0ae2007-07-18 09:19:09 -0400365 } else {
366 if (depth == 0)
Theodore Ts'o55ad63b2009-08-28 10:40:33 -0400367 max = ext4_ext_space_block(inode, 1);
Alex Tomasc29c0ae2007-07-18 09:19:09 -0400368 else
Theodore Ts'o55ad63b2009-08-28 10:40:33 -0400369 max = ext4_ext_space_block_idx(inode, 1);
Alex Tomasc29c0ae2007-07-18 09:19:09 -0400370 }
371
372 return max;
373}
374
Aneesh Kumar K.V56b19862009-03-12 09:51:20 -0400375static int ext4_valid_extent(struct inode *inode, struct ext4_extent *ext)
376{
Theodore Ts'obf89d162010-10-27 21:30:14 -0400377 ext4_fsblk_t block = ext4_ext_pblock(ext);
Aneesh Kumar K.V56b19862009-03-12 09:51:20 -0400378 int len = ext4_ext_get_actual_len(ext);
Eryu Guan5946d082013-12-03 21:22:21 -0500379 ext4_lblk_t lblock = le32_to_cpu(ext->ee_block);
380 ext4_lblk_t last = lblock + len - 1;
Theodore Ts'oe84a26c2009-04-22 20:52:25 -0400381
Eryu Guan5946d082013-12-03 21:22:21 -0500382 if (lblock > last)
Theodore Ts'o31d4f3a2012-03-11 23:30:16 -0400383 return 0;
Theodore Ts'o6fd058f2009-05-17 15:38:01 -0400384 return ext4_data_block_valid(EXT4_SB(inode->i_sb), block, len);
Aneesh Kumar K.V56b19862009-03-12 09:51:20 -0400385}
386
387static int ext4_valid_extent_idx(struct inode *inode,
388 struct ext4_extent_idx *ext_idx)
389{
Theodore Ts'obf89d162010-10-27 21:30:14 -0400390 ext4_fsblk_t block = ext4_idx_pblock(ext_idx);
Theodore Ts'oe84a26c2009-04-22 20:52:25 -0400391
Theodore Ts'o6fd058f2009-05-17 15:38:01 -0400392 return ext4_data_block_valid(EXT4_SB(inode->i_sb), block, 1);
Aneesh Kumar K.V56b19862009-03-12 09:51:20 -0400393}
394
395static int ext4_valid_extent_entries(struct inode *inode,
396 struct ext4_extent_header *eh,
397 int depth)
398{
Aneesh Kumar K.V56b19862009-03-12 09:51:20 -0400399 unsigned short entries;
400 if (eh->eh_entries == 0)
401 return 1;
402
403 entries = le16_to_cpu(eh->eh_entries);
404
405 if (depth == 0) {
406 /* leaf entries */
Yongqiang Yang81fdbb42011-10-29 09:23:38 -0400407 struct ext4_extent *ext = EXT_FIRST_EXTENT(eh);
Eryu Guan5946d082013-12-03 21:22:21 -0500408 struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
409 ext4_fsblk_t pblock = 0;
410 ext4_lblk_t lblock = 0;
411 ext4_lblk_t prev = 0;
412 int len = 0;
Aneesh Kumar K.V56b19862009-03-12 09:51:20 -0400413 while (entries) {
414 if (!ext4_valid_extent(inode, ext))
415 return 0;
Eryu Guan5946d082013-12-03 21:22:21 -0500416
417 /* Check for overlapping extents */
418 lblock = le32_to_cpu(ext->ee_block);
419 len = ext4_ext_get_actual_len(ext);
420 if ((lblock <= prev) && prev) {
421 pblock = ext4_ext_pblock(ext);
422 es->s_last_error_block = cpu_to_le64(pblock);
423 return 0;
424 }
Aneesh Kumar K.V56b19862009-03-12 09:51:20 -0400425 ext++;
426 entries--;
Eryu Guan5946d082013-12-03 21:22:21 -0500427 prev = lblock + len - 1;
Aneesh Kumar K.V56b19862009-03-12 09:51:20 -0400428 }
429 } else {
Yongqiang Yang81fdbb42011-10-29 09:23:38 -0400430 struct ext4_extent_idx *ext_idx = EXT_FIRST_INDEX(eh);
Aneesh Kumar K.V56b19862009-03-12 09:51:20 -0400431 while (entries) {
432 if (!ext4_valid_extent_idx(inode, ext_idx))
433 return 0;
434 ext_idx++;
435 entries--;
436 }
437 }
438 return 1;
439}
440
Theodore Ts'oc398eda2010-07-27 11:56:40 -0400441static int __ext4_ext_check(const char *function, unsigned int line,
442 struct inode *inode, struct ext4_extent_header *eh,
Theodore Ts'oc3491792013-08-16 21:21:41 -0400443 int depth, ext4_fsblk_t pblk)
Alex Tomasc29c0ae2007-07-18 09:19:09 -0400444{
445 const char *error_msg;
446 int max = 0;
447
448 if (unlikely(eh->eh_magic != EXT4_EXT_MAGIC)) {
449 error_msg = "invalid magic";
450 goto corrupted;
451 }
452 if (unlikely(le16_to_cpu(eh->eh_depth) != depth)) {
453 error_msg = "unexpected eh_depth";
454 goto corrupted;
455 }
456 if (unlikely(eh->eh_max == 0)) {
457 error_msg = "invalid eh_max";
458 goto corrupted;
459 }
460 max = ext4_ext_max_entries(inode, depth);
461 if (unlikely(le16_to_cpu(eh->eh_max) > max)) {
462 error_msg = "too large eh_max";
463 goto corrupted;
464 }
465 if (unlikely(le16_to_cpu(eh->eh_entries) > le16_to_cpu(eh->eh_max))) {
466 error_msg = "invalid eh_entries";
467 goto corrupted;
468 }
Aneesh Kumar K.V56b19862009-03-12 09:51:20 -0400469 if (!ext4_valid_extent_entries(inode, eh, depth)) {
470 error_msg = "invalid extent entries";
471 goto corrupted;
472 }
Darrick J. Wong7ac59902012-04-29 18:37:10 -0400473 /* Verify checksum on non-root extent tree nodes */
474 if (ext_depth(inode) != depth &&
475 !ext4_extent_block_csum_verify(inode, eh)) {
476 error_msg = "extent tree corrupted";
477 goto corrupted;
478 }
Alex Tomasc29c0ae2007-07-18 09:19:09 -0400479 return 0;
480
481corrupted:
Theodore Ts'oc398eda2010-07-27 11:56:40 -0400482 ext4_error_inode(inode, function, line, 0,
Theodore Ts'oc3491792013-08-16 21:21:41 -0400483 "pblk %llu bad header/extent: %s - magic %x, "
484 "entries %u, max %u(%u), depth %u(%u)",
485 (unsigned long long) pblk, error_msg,
486 le16_to_cpu(eh->eh_magic),
487 le16_to_cpu(eh->eh_entries), le16_to_cpu(eh->eh_max),
488 max, le16_to_cpu(eh->eh_depth), depth);
Alex Tomasc29c0ae2007-07-18 09:19:09 -0400489 return -EIO;
490}
491
Theodore Ts'oc3491792013-08-16 21:21:41 -0400492#define ext4_ext_check(inode, eh, depth, pblk) \
493 __ext4_ext_check(__func__, __LINE__, (inode), (eh), (depth), (pblk))
Alex Tomasc29c0ae2007-07-18 09:19:09 -0400494
Aneesh Kumar K.V7a262f72009-03-27 16:39:58 -0400495int ext4_ext_check_inode(struct inode *inode)
496{
Theodore Ts'oc3491792013-08-16 21:21:41 -0400497 return ext4_ext_check(inode, ext_inode_hdr(inode), ext_depth(inode), 0);
Aneesh Kumar K.V7a262f72009-03-27 16:39:58 -0400498}
499
Theodore Ts'o7d7ea892013-08-16 21:20:41 -0400500static struct buffer_head *
501__read_extent_tree_block(const char *function, unsigned int line,
Theodore Ts'o107a7bd2013-08-16 21:23:41 -0400502 struct inode *inode, ext4_fsblk_t pblk, int depth,
503 int flags)
Darrick J. Wongf8489122012-04-29 18:21:10 -0400504{
Theodore Ts'o7d7ea892013-08-16 21:20:41 -0400505 struct buffer_head *bh;
506 int err;
Darrick J. Wongf8489122012-04-29 18:21:10 -0400507
Theodore Ts'o7d7ea892013-08-16 21:20:41 -0400508 bh = sb_getblk(inode->i_sb, pblk);
509 if (unlikely(!bh))
510 return ERR_PTR(-ENOMEM);
511
512 if (!bh_uptodate_or_lock(bh)) {
513 trace_ext4_ext_load_extent(inode, pblk, _RET_IP_);
514 err = bh_submit_read(bh);
515 if (err < 0)
516 goto errout;
517 }
Theodore Ts'o7869a4a2013-08-16 22:05:14 -0400518 if (buffer_verified(bh) && !(flags & EXT4_EX_FORCE_CACHE))
Theodore Ts'o7d7ea892013-08-16 21:20:41 -0400519 return bh;
520 err = __ext4_ext_check(function, line, inode,
Theodore Ts'oc3491792013-08-16 21:21:41 -0400521 ext_block_hdr(bh), depth, pblk);
Theodore Ts'o7d7ea892013-08-16 21:20:41 -0400522 if (err)
523 goto errout;
Darrick J. Wongf8489122012-04-29 18:21:10 -0400524 set_buffer_verified(bh);
Theodore Ts'o107a7bd2013-08-16 21:23:41 -0400525 /*
526 * If this is a leaf block, cache all of its entries
527 */
528 if (!(flags & EXT4_EX_NOCACHE) && depth == 0) {
529 struct ext4_extent_header *eh = ext_block_hdr(bh);
530 struct ext4_extent *ex = EXT_FIRST_EXTENT(eh);
531 ext4_lblk_t prev = 0;
532 int i;
533
534 for (i = le16_to_cpu(eh->eh_entries); i > 0; i--, ex++) {
535 unsigned int status = EXTENT_STATUS_WRITTEN;
536 ext4_lblk_t lblk = le32_to_cpu(ex->ee_block);
537 int len = ext4_ext_get_actual_len(ex);
538
539 if (prev && (prev != lblk))
540 ext4_es_cache_extent(inode, prev,
541 lblk - prev, ~0,
542 EXTENT_STATUS_HOLE);
543
Lukas Czerner556615d2014-04-20 23:45:47 -0400544 if (ext4_ext_is_unwritten(ex))
Theodore Ts'o107a7bd2013-08-16 21:23:41 -0400545 status = EXTENT_STATUS_UNWRITTEN;
546 ext4_es_cache_extent(inode, lblk, len,
547 ext4_ext_pblock(ex), status);
548 prev = lblk + len;
549 }
550 }
Theodore Ts'o7d7ea892013-08-16 21:20:41 -0400551 return bh;
552errout:
553 put_bh(bh);
554 return ERR_PTR(err);
555
Darrick J. Wongf8489122012-04-29 18:21:10 -0400556}
557
Theodore Ts'o107a7bd2013-08-16 21:23:41 -0400558#define read_extent_tree_block(inode, pblk, depth, flags) \
559 __read_extent_tree_block(__func__, __LINE__, (inode), (pblk), \
560 (depth), (flags))
Darrick J. Wongf8489122012-04-29 18:21:10 -0400561
Theodore Ts'o7869a4a2013-08-16 22:05:14 -0400562/*
563 * This function is called to cache a file's extent information in the
564 * extent status tree
565 */
566int ext4_ext_precache(struct inode *inode)
567{
568 struct ext4_inode_info *ei = EXT4_I(inode);
569 struct ext4_ext_path *path = NULL;
570 struct buffer_head *bh;
571 int i = 0, depth, ret = 0;
572
573 if (!ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))
574 return 0; /* not an extent-mapped inode */
575
576 down_read(&ei->i_data_sem);
577 depth = ext_depth(inode);
578
579 path = kzalloc(sizeof(struct ext4_ext_path) * (depth + 1),
580 GFP_NOFS);
581 if (path == NULL) {
582 up_read(&ei->i_data_sem);
583 return -ENOMEM;
584 }
585
586 /* Don't cache anything if there are no external extent blocks */
587 if (depth == 0)
588 goto out;
589 path[0].p_hdr = ext_inode_hdr(inode);
590 ret = ext4_ext_check(inode, path[0].p_hdr, depth, 0);
591 if (ret)
592 goto out;
593 path[0].p_idx = EXT_FIRST_INDEX(path[0].p_hdr);
594 while (i >= 0) {
595 /*
596 * If this is a leaf block or we've reached the end of
597 * the index block, go up
598 */
599 if ((i == depth) ||
600 path[i].p_idx > EXT_LAST_INDEX(path[i].p_hdr)) {
601 brelse(path[i].p_bh);
602 path[i].p_bh = NULL;
603 i--;
604 continue;
605 }
606 bh = read_extent_tree_block(inode,
607 ext4_idx_pblock(path[i].p_idx++),
608 depth - i - 1,
609 EXT4_EX_FORCE_CACHE);
610 if (IS_ERR(bh)) {
611 ret = PTR_ERR(bh);
612 break;
613 }
614 i++;
615 path[i].p_bh = bh;
616 path[i].p_hdr = ext_block_hdr(bh);
617 path[i].p_idx = EXT_FIRST_INDEX(path[i].p_hdr);
618 }
619 ext4_set_inode_state(inode, EXT4_STATE_EXT_PRECACHED);
620out:
621 up_read(&ei->i_data_sem);
622 ext4_ext_drop_refs(path);
623 kfree(path);
624 return ret;
625}
626
Alex Tomasa86c6182006-10-11 01:21:03 -0700627#ifdef EXT_DEBUG
628static void ext4_ext_show_path(struct inode *inode, struct ext4_ext_path *path)
629{
630 int k, l = path->p_depth;
631
632 ext_debug("path:");
633 for (k = 0; k <= l; k++, path++) {
634 if (path->p_idx) {
Mingming Cao2ae02102006-10-11 01:21:11 -0700635 ext_debug(" %d->%llu", le32_to_cpu(path->p_idx->ei_block),
Theodore Ts'obf89d162010-10-27 21:30:14 -0400636 ext4_idx_pblock(path->p_idx));
Alex Tomasa86c6182006-10-11 01:21:03 -0700637 } else if (path->p_ext) {
Mingming553f9002009-09-18 13:34:55 -0400638 ext_debug(" %d:[%d]%d:%llu ",
Alex Tomasa86c6182006-10-11 01:21:03 -0700639 le32_to_cpu(path->p_ext->ee_block),
Lukas Czerner556615d2014-04-20 23:45:47 -0400640 ext4_ext_is_unwritten(path->p_ext),
Amit Aroraa2df2a62007-07-17 21:42:41 -0400641 ext4_ext_get_actual_len(path->p_ext),
Theodore Ts'obf89d162010-10-27 21:30:14 -0400642 ext4_ext_pblock(path->p_ext));
Alex Tomasa86c6182006-10-11 01:21:03 -0700643 } else
644 ext_debug(" []");
645 }
646 ext_debug("\n");
647}
648
649static void ext4_ext_show_leaf(struct inode *inode, struct ext4_ext_path *path)
650{
651 int depth = ext_depth(inode);
652 struct ext4_extent_header *eh;
653 struct ext4_extent *ex;
654 int i;
655
656 if (!path)
657 return;
658
659 eh = path[depth].p_hdr;
660 ex = EXT_FIRST_EXTENT(eh);
661
Mingming553f9002009-09-18 13:34:55 -0400662 ext_debug("Displaying leaf extents for inode %lu\n", inode->i_ino);
663
Alex Tomasa86c6182006-10-11 01:21:03 -0700664 for (i = 0; i < le16_to_cpu(eh->eh_entries); i++, ex++) {
Mingming553f9002009-09-18 13:34:55 -0400665 ext_debug("%d:[%d]%d:%llu ", le32_to_cpu(ex->ee_block),
Lukas Czerner556615d2014-04-20 23:45:47 -0400666 ext4_ext_is_unwritten(ex),
Theodore Ts'obf89d162010-10-27 21:30:14 -0400667 ext4_ext_get_actual_len(ex), ext4_ext_pblock(ex));
Alex Tomasa86c6182006-10-11 01:21:03 -0700668 }
669 ext_debug("\n");
670}
Yongqiang Yang1b16da72011-05-25 17:41:48 -0400671
672static void ext4_ext_show_move(struct inode *inode, struct ext4_ext_path *path,
673 ext4_fsblk_t newblock, int level)
674{
675 int depth = ext_depth(inode);
676 struct ext4_extent *ex;
677
678 if (depth != level) {
679 struct ext4_extent_idx *idx;
680 idx = path[level].p_idx;
681 while (idx <= EXT_MAX_INDEX(path[level].p_hdr)) {
682 ext_debug("%d: move %d:%llu in new index %llu\n", level,
683 le32_to_cpu(idx->ei_block),
684 ext4_idx_pblock(idx),
685 newblock);
686 idx++;
687 }
688
689 return;
690 }
691
692 ex = path[depth].p_ext;
693 while (ex <= EXT_MAX_EXTENT(path[depth].p_hdr)) {
694 ext_debug("move %d:%llu:[%d]%d in new leaf %llu\n",
695 le32_to_cpu(ex->ee_block),
696 ext4_ext_pblock(ex),
Lukas Czerner556615d2014-04-20 23:45:47 -0400697 ext4_ext_is_unwritten(ex),
Yongqiang Yang1b16da72011-05-25 17:41:48 -0400698 ext4_ext_get_actual_len(ex),
699 newblock);
700 ex++;
701 }
702}
703
Alex Tomasa86c6182006-10-11 01:21:03 -0700704#else
Theodore Ts'oaf5bc922008-09-08 22:25:24 -0400705#define ext4_ext_show_path(inode, path)
706#define ext4_ext_show_leaf(inode, path)
Yongqiang Yang1b16da72011-05-25 17:41:48 -0400707#define ext4_ext_show_move(inode, path, newblock, level)
Alex Tomasa86c6182006-10-11 01:21:03 -0700708#endif
709
Aneesh Kumar K.Vb35905c2008-02-25 16:54:37 -0500710void ext4_ext_drop_refs(struct ext4_ext_path *path)
Alex Tomasa86c6182006-10-11 01:21:03 -0700711{
712 int depth = path->p_depth;
713 int i;
714
715 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 *
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -0500858ext4_ext_find_extent(struct inode *inode, ext4_lblk_t block,
Theodore Ts'o705912c2014-09-01 14:34:09 -0400859 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
870 /* account possible depth increase */
871 if (!path) {
Avantika Mathur5d4958f2006-12-06 20:41:35 -0800872 path = kzalloc(sizeof(struct ext4_ext_path) * (depth + 2),
Alex Tomasa86c6182006-10-11 01:21:03 -0700873 GFP_NOFS);
Theodore Ts'o19008f62014-08-31 15:03:14 -0400874 if (unlikely(!path))
Alex Tomasa86c6182006-10-11 01:21:03 -0700875 return ERR_PTR(-ENOMEM);
Alex Tomasa86c6182006-10-11 01:21:03 -0700876 }
Alex Tomasa86c6182006-10-11 01:21:03 -0700877 path[0].p_hdr = eh;
Shen Feng1973adc2008-07-11 19:27:31 -0400878 path[0].p_bh = NULL;
Alex Tomasa86c6182006-10-11 01:21:03 -0700879
Alex Tomasc29c0ae2007-07-18 09:19:09 -0400880 i = depth;
Alex Tomasa86c6182006-10-11 01:21:03 -0700881 /* walk through the tree */
882 while (i) {
883 ext_debug("depth %d: num %d, max %d\n",
884 ppos, le16_to_cpu(eh->eh_entries), le16_to_cpu(eh->eh_max));
Alex Tomasc29c0ae2007-07-18 09:19:09 -0400885
Alex Tomasa86c6182006-10-11 01:21:03 -0700886 ext4_ext_binsearch_idx(inode, path + ppos, block);
Theodore Ts'obf89d162010-10-27 21:30:14 -0400887 path[ppos].p_block = ext4_idx_pblock(path[ppos].p_idx);
Alex Tomasa86c6182006-10-11 01:21:03 -0700888 path[ppos].p_depth = i;
889 path[ppos].p_ext = NULL;
890
Theodore Ts'o107a7bd2013-08-16 21:23:41 -0400891 bh = read_extent_tree_block(inode, path[ppos].p_block, --i,
892 flags);
Theodore Ts'o19008f62014-08-31 15:03:14 -0400893 if (unlikely(IS_ERR(bh))) {
Theodore Ts'o7d7ea892013-08-16 21:20:41 -0400894 ret = PTR_ERR(bh);
Alex Tomasa86c6182006-10-11 01:21:03 -0700895 goto err;
Theodore Ts'o860d21e2013-01-12 16:19:36 -0500896 }
Theodore Ts'o7d7ea892013-08-16 21:20:41 -0400897
Alex Tomasa86c6182006-10-11 01:21:03 -0700898 eh = ext_block_hdr(bh);
899 ppos++;
Frank Mayhar273df552010-03-02 11:46:09 -0500900 if (unlikely(ppos > depth)) {
901 put_bh(bh);
902 EXT4_ERROR_INODE(inode,
903 "ppos %d > depth %d", ppos, depth);
Theodore Ts'o860d21e2013-01-12 16:19:36 -0500904 ret = -EIO;
Frank Mayhar273df552010-03-02 11:46:09 -0500905 goto err;
906 }
Alex Tomasa86c6182006-10-11 01:21:03 -0700907 path[ppos].p_bh = bh;
908 path[ppos].p_hdr = eh;
Alex Tomasa86c6182006-10-11 01:21:03 -0700909 }
910
911 path[ppos].p_depth = i;
Alex Tomasa86c6182006-10-11 01:21:03 -0700912 path[ppos].p_ext = NULL;
913 path[ppos].p_idx = NULL;
914
Alex Tomasa86c6182006-10-11 01:21:03 -0700915 /* find extent */
916 ext4_ext_binsearch(inode, path + ppos, block);
Shen Feng1973adc2008-07-11 19:27:31 -0400917 /* if not an empty leaf */
918 if (path[ppos].p_ext)
Theodore Ts'obf89d162010-10-27 21:30:14 -0400919 path[ppos].p_block = ext4_ext_pblock(path[ppos].p_ext);
Alex Tomasa86c6182006-10-11 01:21:03 -0700920
921 ext4_ext_show_path(inode, path);
922
923 return path;
924
925err:
926 ext4_ext_drop_refs(path);
Theodore Ts'odfe50802014-09-01 14:37:09 -0400927 kfree(path);
928 if (orig_path)
929 *orig_path = NULL;
Theodore Ts'o860d21e2013-01-12 16:19:36 -0500930 return ERR_PTR(ret);
Alex Tomasa86c6182006-10-11 01:21:03 -0700931}
932
933/*
Randy Dunlapd0d856e2006-10-11 01:21:07 -0700934 * ext4_ext_insert_index:
935 * insert new index [@logical;@ptr] into the block at @curp;
936 * check where to insert: before @curp or after @curp
Alex Tomasa86c6182006-10-11 01:21:03 -0700937 */
Theodore Ts'o1f109d52010-10-27 21:30:14 -0400938static int ext4_ext_insert_index(handle_t *handle, struct inode *inode,
939 struct ext4_ext_path *curp,
940 int logical, ext4_fsblk_t ptr)
Alex Tomasa86c6182006-10-11 01:21:03 -0700941{
942 struct ext4_extent_idx *ix;
943 int len, err;
944
Avantika Mathur7e028972006-12-06 20:41:33 -0800945 err = ext4_ext_get_access(handle, inode, curp);
946 if (err)
Alex Tomasa86c6182006-10-11 01:21:03 -0700947 return err;
948
Frank Mayhar273df552010-03-02 11:46:09 -0500949 if (unlikely(logical == le32_to_cpu(curp->p_idx->ei_block))) {
950 EXT4_ERROR_INODE(inode,
951 "logical %d == ei_block %d!",
952 logical, le32_to_cpu(curp->p_idx->ei_block));
953 return -EIO;
954 }
Robin Dongd4620312011-07-17 23:43:42 -0400955
956 if (unlikely(le16_to_cpu(curp->p_hdr->eh_entries)
957 >= le16_to_cpu(curp->p_hdr->eh_max))) {
958 EXT4_ERROR_INODE(inode,
959 "eh_entries %d >= eh_max %d!",
960 le16_to_cpu(curp->p_hdr->eh_entries),
961 le16_to_cpu(curp->p_hdr->eh_max));
962 return -EIO;
963 }
964
Alex Tomasa86c6182006-10-11 01:21:03 -0700965 if (logical > le32_to_cpu(curp->p_idx->ei_block)) {
966 /* insert after */
Eric Gouriou80e675f2011-10-27 11:52:18 -0400967 ext_debug("insert new index %d after: %llu\n", logical, ptr);
Alex Tomasa86c6182006-10-11 01:21:03 -0700968 ix = curp->p_idx + 1;
969 } else {
970 /* insert before */
Eric Gouriou80e675f2011-10-27 11:52:18 -0400971 ext_debug("insert new index %d before: %llu\n", logical, ptr);
Alex Tomasa86c6182006-10-11 01:21:03 -0700972 ix = curp->p_idx;
973 }
974
Eric Gouriou80e675f2011-10-27 11:52:18 -0400975 len = EXT_LAST_INDEX(curp->p_hdr) - ix + 1;
976 BUG_ON(len < 0);
977 if (len > 0) {
978 ext_debug("insert new index %d: "
979 "move %d indices from 0x%p to 0x%p\n",
980 logical, len, ix, ix + 1);
981 memmove(ix + 1, ix, len * sizeof(struct ext4_extent_idx));
982 }
983
Tao Maf472e022011-10-17 10:13:46 -0400984 if (unlikely(ix > EXT_MAX_INDEX(curp->p_hdr))) {
985 EXT4_ERROR_INODE(inode, "ix > EXT_MAX_INDEX!");
986 return -EIO;
987 }
988
Alex Tomasa86c6182006-10-11 01:21:03 -0700989 ix->ei_block = cpu_to_le32(logical);
Alex Tomasf65e6fb2006-10-11 01:21:05 -0700990 ext4_idx_store_pblock(ix, ptr);
Marcin Slusarze8546d02008-04-17 10:38:59 -0400991 le16_add_cpu(&curp->p_hdr->eh_entries, 1);
Alex Tomasa86c6182006-10-11 01:21:03 -0700992
Frank Mayhar273df552010-03-02 11:46:09 -0500993 if (unlikely(ix > EXT_LAST_INDEX(curp->p_hdr))) {
994 EXT4_ERROR_INODE(inode, "ix > EXT_LAST_INDEX!");
995 return -EIO;
996 }
Alex Tomasa86c6182006-10-11 01:21:03 -0700997
998 err = ext4_ext_dirty(handle, inode, curp);
999 ext4_std_error(inode->i_sb, err);
1000
1001 return err;
1002}
1003
1004/*
Randy Dunlapd0d856e2006-10-11 01:21:07 -07001005 * ext4_ext_split:
1006 * inserts new subtree into the path, using free index entry
1007 * at depth @at:
1008 * - allocates all needed blocks (new leaf and all intermediate index blocks)
1009 * - makes decision where to split
1010 * - moves remaining extents and index entries (right to the split point)
1011 * into the newly allocated blocks
1012 * - initializes subtree
Alex Tomasa86c6182006-10-11 01:21:03 -07001013 */
1014static int ext4_ext_split(handle_t *handle, struct inode *inode,
Allison Henderson55f020d2011-05-25 07:41:26 -04001015 unsigned int flags,
1016 struct ext4_ext_path *path,
1017 struct ext4_extent *newext, int at)
Alex Tomasa86c6182006-10-11 01:21:03 -07001018{
1019 struct buffer_head *bh = NULL;
1020 int depth = ext_depth(inode);
1021 struct ext4_extent_header *neh;
1022 struct ext4_extent_idx *fidx;
Alex Tomasa86c6182006-10-11 01:21:03 -07001023 int i = at, k, m, a;
Alex Tomasf65e6fb2006-10-11 01:21:05 -07001024 ext4_fsblk_t newblock, oldblock;
Alex Tomasa86c6182006-10-11 01:21:03 -07001025 __le32 border;
Alex Tomasf65e6fb2006-10-11 01:21:05 -07001026 ext4_fsblk_t *ablocks = NULL; /* array of allocated blocks */
Alex Tomasa86c6182006-10-11 01:21:03 -07001027 int err = 0;
1028
1029 /* make decision: where to split? */
Randy Dunlapd0d856e2006-10-11 01:21:07 -07001030 /* FIXME: now decision is simplest: at current extent */
Alex Tomasa86c6182006-10-11 01:21:03 -07001031
Randy Dunlapd0d856e2006-10-11 01:21:07 -07001032 /* if current leaf will be split, then we should use
Alex Tomasa86c6182006-10-11 01:21:03 -07001033 * border from split point */
Frank Mayhar273df552010-03-02 11:46:09 -05001034 if (unlikely(path[depth].p_ext > EXT_MAX_EXTENT(path[depth].p_hdr))) {
1035 EXT4_ERROR_INODE(inode, "p_ext > EXT_MAX_EXTENT!");
1036 return -EIO;
1037 }
Alex Tomasa86c6182006-10-11 01:21:03 -07001038 if (path[depth].p_ext != EXT_MAX_EXTENT(path[depth].p_hdr)) {
1039 border = path[depth].p_ext[1].ee_block;
Randy Dunlapd0d856e2006-10-11 01:21:07 -07001040 ext_debug("leaf will be split."
Alex Tomasa86c6182006-10-11 01:21:03 -07001041 " next leaf starts at %d\n",
Dave Kleikamp8c55e202007-05-24 13:04:54 -04001042 le32_to_cpu(border));
Alex Tomasa86c6182006-10-11 01:21:03 -07001043 } else {
1044 border = newext->ee_block;
1045 ext_debug("leaf will be added."
1046 " next leaf starts at %d\n",
Dave Kleikamp8c55e202007-05-24 13:04:54 -04001047 le32_to_cpu(border));
Alex Tomasa86c6182006-10-11 01:21:03 -07001048 }
1049
1050 /*
Randy Dunlapd0d856e2006-10-11 01:21:07 -07001051 * If error occurs, then we break processing
1052 * and mark filesystem read-only. index won't
Alex Tomasa86c6182006-10-11 01:21:03 -07001053 * be inserted and tree will be in consistent
Randy Dunlapd0d856e2006-10-11 01:21:07 -07001054 * state. Next mount will repair buffers too.
Alex Tomasa86c6182006-10-11 01:21:03 -07001055 */
1056
1057 /*
Randy Dunlapd0d856e2006-10-11 01:21:07 -07001058 * Get array to track all allocated blocks.
1059 * We need this to handle errors and free blocks
1060 * upon them.
Alex Tomasa86c6182006-10-11 01:21:03 -07001061 */
Avantika Mathur5d4958f2006-12-06 20:41:35 -08001062 ablocks = kzalloc(sizeof(ext4_fsblk_t) * depth, GFP_NOFS);
Alex Tomasa86c6182006-10-11 01:21:03 -07001063 if (!ablocks)
1064 return -ENOMEM;
Alex Tomasa86c6182006-10-11 01:21:03 -07001065
1066 /* allocate all needed blocks */
1067 ext_debug("allocate %d blocks for indexes/leaf\n", depth - at);
1068 for (a = 0; a < depth - at; a++) {
Aneesh Kumar K.V654b4902008-07-11 19:27:31 -04001069 newblock = ext4_ext_new_meta_block(handle, inode, path,
Allison Henderson55f020d2011-05-25 07:41:26 -04001070 newext, &err, flags);
Alex Tomasa86c6182006-10-11 01:21:03 -07001071 if (newblock == 0)
1072 goto cleanup;
1073 ablocks[a] = newblock;
1074 }
1075
1076 /* initialize new leaf */
1077 newblock = ablocks[--a];
Frank Mayhar273df552010-03-02 11:46:09 -05001078 if (unlikely(newblock == 0)) {
1079 EXT4_ERROR_INODE(inode, "newblock == 0!");
1080 err = -EIO;
1081 goto cleanup;
1082 }
Alex Tomasa86c6182006-10-11 01:21:03 -07001083 bh = sb_getblk(inode->i_sb, newblock);
Wang Shilongaebf0242013-01-12 16:28:47 -05001084 if (unlikely(!bh)) {
Theodore Ts'o860d21e2013-01-12 16:19:36 -05001085 err = -ENOMEM;
Alex Tomasa86c6182006-10-11 01:21:03 -07001086 goto cleanup;
1087 }
1088 lock_buffer(bh);
1089
Avantika Mathur7e028972006-12-06 20:41:33 -08001090 err = ext4_journal_get_create_access(handle, bh);
1091 if (err)
Alex Tomasa86c6182006-10-11 01:21:03 -07001092 goto cleanup;
1093
1094 neh = ext_block_hdr(bh);
1095 neh->eh_entries = 0;
Theodore Ts'o55ad63b2009-08-28 10:40:33 -04001096 neh->eh_max = cpu_to_le16(ext4_ext_space_block(inode, 0));
Alex Tomasa86c6182006-10-11 01:21:03 -07001097 neh->eh_magic = EXT4_EXT_MAGIC;
1098 neh->eh_depth = 0;
Alex Tomasa86c6182006-10-11 01:21:03 -07001099
Randy Dunlapd0d856e2006-10-11 01:21:07 -07001100 /* move remainder of path[depth] to the new leaf */
Frank Mayhar273df552010-03-02 11:46:09 -05001101 if (unlikely(path[depth].p_hdr->eh_entries !=
1102 path[depth].p_hdr->eh_max)) {
1103 EXT4_ERROR_INODE(inode, "eh_entries %d != eh_max %d!",
1104 path[depth].p_hdr->eh_entries,
1105 path[depth].p_hdr->eh_max);
1106 err = -EIO;
1107 goto cleanup;
1108 }
Alex Tomasa86c6182006-10-11 01:21:03 -07001109 /* start copy from next extent */
Yongqiang Yang1b16da72011-05-25 17:41:48 -04001110 m = EXT_MAX_EXTENT(path[depth].p_hdr) - path[depth].p_ext++;
1111 ext4_ext_show_move(inode, path, newblock, depth);
Alex Tomasa86c6182006-10-11 01:21:03 -07001112 if (m) {
Yongqiang Yang1b16da72011-05-25 17:41:48 -04001113 struct ext4_extent *ex;
1114 ex = EXT_FIRST_EXTENT(neh);
1115 memmove(ex, path[depth].p_ext, sizeof(struct ext4_extent) * m);
Marcin Slusarze8546d02008-04-17 10:38:59 -04001116 le16_add_cpu(&neh->eh_entries, m);
Alex Tomasa86c6182006-10-11 01:21:03 -07001117 }
1118
Darrick J. Wong7ac59902012-04-29 18:37:10 -04001119 ext4_extent_block_csum_set(inode, neh);
Alex Tomasa86c6182006-10-11 01:21:03 -07001120 set_buffer_uptodate(bh);
1121 unlock_buffer(bh);
1122
Frank Mayhar03901312009-01-07 00:06:22 -05001123 err = ext4_handle_dirty_metadata(handle, inode, bh);
Avantika Mathur7e028972006-12-06 20:41:33 -08001124 if (err)
Alex Tomasa86c6182006-10-11 01:21:03 -07001125 goto cleanup;
1126 brelse(bh);
1127 bh = NULL;
1128
1129 /* correct old leaf */
1130 if (m) {
Avantika Mathur7e028972006-12-06 20:41:33 -08001131 err = ext4_ext_get_access(handle, inode, path + depth);
1132 if (err)
Alex Tomasa86c6182006-10-11 01:21:03 -07001133 goto cleanup;
Marcin Slusarze8546d02008-04-17 10:38:59 -04001134 le16_add_cpu(&path[depth].p_hdr->eh_entries, -m);
Avantika Mathur7e028972006-12-06 20:41:33 -08001135 err = ext4_ext_dirty(handle, inode, path + depth);
1136 if (err)
Alex Tomasa86c6182006-10-11 01:21:03 -07001137 goto cleanup;
1138
1139 }
1140
1141 /* create intermediate indexes */
1142 k = depth - at - 1;
Frank Mayhar273df552010-03-02 11:46:09 -05001143 if (unlikely(k < 0)) {
1144 EXT4_ERROR_INODE(inode, "k %d < 0!", k);
1145 err = -EIO;
1146 goto cleanup;
1147 }
Alex Tomasa86c6182006-10-11 01:21:03 -07001148 if (k)
1149 ext_debug("create %d intermediate indices\n", k);
1150 /* insert new index into current index block */
1151 /* current depth stored in i var */
1152 i = depth - 1;
1153 while (k--) {
1154 oldblock = newblock;
1155 newblock = ablocks[--a];
Eric Sandeenbba90742008-01-28 23:58:27 -05001156 bh = sb_getblk(inode->i_sb, newblock);
Wang Shilongaebf0242013-01-12 16:28:47 -05001157 if (unlikely(!bh)) {
Theodore Ts'o860d21e2013-01-12 16:19:36 -05001158 err = -ENOMEM;
Alex Tomasa86c6182006-10-11 01:21:03 -07001159 goto cleanup;
1160 }
1161 lock_buffer(bh);
1162
Avantika Mathur7e028972006-12-06 20:41:33 -08001163 err = ext4_journal_get_create_access(handle, bh);
1164 if (err)
Alex Tomasa86c6182006-10-11 01:21:03 -07001165 goto cleanup;
1166
1167 neh = ext_block_hdr(bh);
1168 neh->eh_entries = cpu_to_le16(1);
1169 neh->eh_magic = EXT4_EXT_MAGIC;
Theodore Ts'o55ad63b2009-08-28 10:40:33 -04001170 neh->eh_max = cpu_to_le16(ext4_ext_space_block_idx(inode, 0));
Alex Tomasa86c6182006-10-11 01:21:03 -07001171 neh->eh_depth = cpu_to_le16(depth - i);
1172 fidx = EXT_FIRST_INDEX(neh);
1173 fidx->ei_block = border;
Alex Tomasf65e6fb2006-10-11 01:21:05 -07001174 ext4_idx_store_pblock(fidx, oldblock);
Alex Tomasa86c6182006-10-11 01:21:03 -07001175
Eric Sandeenbba90742008-01-28 23:58:27 -05001176 ext_debug("int.index at %d (block %llu): %u -> %llu\n",
1177 i, newblock, le32_to_cpu(border), oldblock);
Alex Tomasa86c6182006-10-11 01:21:03 -07001178
Yongqiang Yang1b16da72011-05-25 17:41:48 -04001179 /* move remainder of path[i] to the new index block */
Frank Mayhar273df552010-03-02 11:46:09 -05001180 if (unlikely(EXT_MAX_INDEX(path[i].p_hdr) !=
1181 EXT_LAST_INDEX(path[i].p_hdr))) {
1182 EXT4_ERROR_INODE(inode,
1183 "EXT_MAX_INDEX != EXT_LAST_INDEX ee_block %d!",
1184 le32_to_cpu(path[i].p_ext->ee_block));
1185 err = -EIO;
1186 goto cleanup;
1187 }
Yongqiang Yang1b16da72011-05-25 17:41:48 -04001188 /* start copy indexes */
1189 m = EXT_MAX_INDEX(path[i].p_hdr) - path[i].p_idx++;
1190 ext_debug("cur 0x%p, last 0x%p\n", path[i].p_idx,
1191 EXT_MAX_INDEX(path[i].p_hdr));
1192 ext4_ext_show_move(inode, path, newblock, i);
Alex Tomasa86c6182006-10-11 01:21:03 -07001193 if (m) {
Yongqiang Yang1b16da72011-05-25 17:41:48 -04001194 memmove(++fidx, path[i].p_idx,
Alex Tomasa86c6182006-10-11 01:21:03 -07001195 sizeof(struct ext4_extent_idx) * m);
Marcin Slusarze8546d02008-04-17 10:38:59 -04001196 le16_add_cpu(&neh->eh_entries, m);
Alex Tomasa86c6182006-10-11 01:21:03 -07001197 }
Darrick J. Wong7ac59902012-04-29 18:37:10 -04001198 ext4_extent_block_csum_set(inode, neh);
Alex Tomasa86c6182006-10-11 01:21:03 -07001199 set_buffer_uptodate(bh);
1200 unlock_buffer(bh);
1201
Frank Mayhar03901312009-01-07 00:06:22 -05001202 err = ext4_handle_dirty_metadata(handle, inode, bh);
Avantika Mathur7e028972006-12-06 20:41:33 -08001203 if (err)
Alex Tomasa86c6182006-10-11 01:21:03 -07001204 goto cleanup;
1205 brelse(bh);
1206 bh = NULL;
1207
1208 /* correct old index */
1209 if (m) {
1210 err = ext4_ext_get_access(handle, inode, path + i);
1211 if (err)
1212 goto cleanup;
Marcin Slusarze8546d02008-04-17 10:38:59 -04001213 le16_add_cpu(&path[i].p_hdr->eh_entries, -m);
Alex Tomasa86c6182006-10-11 01:21:03 -07001214 err = ext4_ext_dirty(handle, inode, path + i);
1215 if (err)
1216 goto cleanup;
1217 }
1218
1219 i--;
1220 }
1221
1222 /* insert new index */
Alex Tomasa86c6182006-10-11 01:21:03 -07001223 err = ext4_ext_insert_index(handle, inode, path + at,
1224 le32_to_cpu(border), newblock);
1225
1226cleanup:
1227 if (bh) {
1228 if (buffer_locked(bh))
1229 unlock_buffer(bh);
1230 brelse(bh);
1231 }
1232
1233 if (err) {
1234 /* free all allocated blocks in error case */
1235 for (i = 0; i < depth; i++) {
1236 if (!ablocks[i])
1237 continue;
Peter Huewe7dc57612011-02-21 21:01:42 -05001238 ext4_free_blocks(handle, inode, NULL, ablocks[i], 1,
Theodore Ts'oe6362602009-11-23 07:17:05 -05001239 EXT4_FREE_BLOCKS_METADATA);
Alex Tomasa86c6182006-10-11 01:21:03 -07001240 }
1241 }
1242 kfree(ablocks);
1243
1244 return err;
1245}
1246
1247/*
Randy Dunlapd0d856e2006-10-11 01:21:07 -07001248 * ext4_ext_grow_indepth:
1249 * implements tree growing procedure:
1250 * - allocates new block
1251 * - moves top-level data (index block or leaf) into the new block
1252 * - initializes new top-level, creating index that points to the
1253 * just created block
Alex Tomasa86c6182006-10-11 01:21:03 -07001254 */
1255static int ext4_ext_grow_indepth(handle_t *handle, struct inode *inode,
Allison Henderson55f020d2011-05-25 07:41:26 -04001256 unsigned int flags,
Allison Henderson55f020d2011-05-25 07:41:26 -04001257 struct ext4_extent *newext)
Alex Tomasa86c6182006-10-11 01:21:03 -07001258{
Alex Tomasa86c6182006-10-11 01:21:03 -07001259 struct ext4_extent_header *neh;
Alex Tomasa86c6182006-10-11 01:21:03 -07001260 struct buffer_head *bh;
Alex Tomasf65e6fb2006-10-11 01:21:05 -07001261 ext4_fsblk_t newblock;
Alex Tomasa86c6182006-10-11 01:21:03 -07001262 int err = 0;
1263
Dmitry Monakhov1939dd82011-10-22 01:26:05 -04001264 newblock = ext4_ext_new_meta_block(handle, inode, NULL,
Allison Henderson55f020d2011-05-25 07:41:26 -04001265 newext, &err, flags);
Alex Tomasa86c6182006-10-11 01:21:03 -07001266 if (newblock == 0)
1267 return err;
1268
1269 bh = sb_getblk(inode->i_sb, newblock);
Wang Shilongaebf0242013-01-12 16:28:47 -05001270 if (unlikely(!bh))
Theodore Ts'o860d21e2013-01-12 16:19:36 -05001271 return -ENOMEM;
Alex Tomasa86c6182006-10-11 01:21:03 -07001272 lock_buffer(bh);
1273
Avantika Mathur7e028972006-12-06 20:41:33 -08001274 err = ext4_journal_get_create_access(handle, bh);
1275 if (err) {
Alex Tomasa86c6182006-10-11 01:21:03 -07001276 unlock_buffer(bh);
1277 goto out;
1278 }
1279
1280 /* move top-level index/leaf into new block */
Dmitry Monakhov1939dd82011-10-22 01:26:05 -04001281 memmove(bh->b_data, EXT4_I(inode)->i_data,
1282 sizeof(EXT4_I(inode)->i_data));
Alex Tomasa86c6182006-10-11 01:21:03 -07001283
1284 /* set size of new block */
1285 neh = ext_block_hdr(bh);
1286 /* old root could have indexes or leaves
1287 * so calculate e_max right way */
1288 if (ext_depth(inode))
Theodore Ts'o55ad63b2009-08-28 10:40:33 -04001289 neh->eh_max = cpu_to_le16(ext4_ext_space_block_idx(inode, 0));
Alex Tomasa86c6182006-10-11 01:21:03 -07001290 else
Theodore Ts'o55ad63b2009-08-28 10:40:33 -04001291 neh->eh_max = cpu_to_le16(ext4_ext_space_block(inode, 0));
Alex Tomasa86c6182006-10-11 01:21:03 -07001292 neh->eh_magic = EXT4_EXT_MAGIC;
Darrick J. Wong7ac59902012-04-29 18:37:10 -04001293 ext4_extent_block_csum_set(inode, neh);
Alex Tomasa86c6182006-10-11 01:21:03 -07001294 set_buffer_uptodate(bh);
1295 unlock_buffer(bh);
1296
Frank Mayhar03901312009-01-07 00:06:22 -05001297 err = ext4_handle_dirty_metadata(handle, inode, bh);
Avantika Mathur7e028972006-12-06 20:41:33 -08001298 if (err)
Alex Tomasa86c6182006-10-11 01:21:03 -07001299 goto out;
1300
Dmitry Monakhov1939dd82011-10-22 01:26:05 -04001301 /* Update top-level index: num,max,pointer */
Alex Tomasa86c6182006-10-11 01:21:03 -07001302 neh = ext_inode_hdr(inode);
Dmitry Monakhov1939dd82011-10-22 01:26:05 -04001303 neh->eh_entries = cpu_to_le16(1);
1304 ext4_idx_store_pblock(EXT_FIRST_INDEX(neh), newblock);
1305 if (neh->eh_depth == 0) {
1306 /* Root extent block becomes index block */
1307 neh->eh_max = cpu_to_le16(ext4_ext_space_root_idx(inode, 0));
1308 EXT_FIRST_INDEX(neh)->ei_block =
1309 EXT_FIRST_EXTENT(neh)->ee_block;
1310 }
Mingming Cao2ae02102006-10-11 01:21:11 -07001311 ext_debug("new root: num %d(%d), lblock %d, ptr %llu\n",
Alex Tomasa86c6182006-10-11 01:21:03 -07001312 le16_to_cpu(neh->eh_entries), le16_to_cpu(neh->eh_max),
Andi Kleen5a0790c2010-06-14 13:28:03 -04001313 le32_to_cpu(EXT_FIRST_INDEX(neh)->ei_block),
Theodore Ts'obf89d162010-10-27 21:30:14 -04001314 ext4_idx_pblock(EXT_FIRST_INDEX(neh)));
Alex Tomasa86c6182006-10-11 01:21:03 -07001315
Wei Yongjunba39ebb2012-09-27 09:37:53 -04001316 le16_add_cpu(&neh->eh_depth, 1);
Dmitry Monakhov1939dd82011-10-22 01:26:05 -04001317 ext4_mark_inode_dirty(handle, inode);
Alex Tomasa86c6182006-10-11 01:21:03 -07001318out:
1319 brelse(bh);
1320
1321 return err;
1322}
1323
1324/*
Randy Dunlapd0d856e2006-10-11 01:21:07 -07001325 * ext4_ext_create_new_leaf:
1326 * finds empty index and adds new leaf.
1327 * if no free index is found, then it requests in-depth growing.
Alex Tomasa86c6182006-10-11 01:21:03 -07001328 */
1329static int ext4_ext_create_new_leaf(handle_t *handle, struct inode *inode,
Theodore Ts'o107a7bd2013-08-16 21:23:41 -04001330 unsigned int mb_flags,
1331 unsigned int gb_flags,
Theodore Ts'odfe50802014-09-01 14:37:09 -04001332 struct ext4_ext_path **ppath,
Allison Henderson55f020d2011-05-25 07:41:26 -04001333 struct ext4_extent *newext)
Alex Tomasa86c6182006-10-11 01:21:03 -07001334{
Theodore Ts'odfe50802014-09-01 14:37:09 -04001335 struct ext4_ext_path *path = *ppath;
Alex Tomasa86c6182006-10-11 01:21:03 -07001336 struct ext4_ext_path *curp;
1337 int depth, i, err = 0;
1338
1339repeat:
1340 i = depth = ext_depth(inode);
1341
1342 /* walk up to the tree and look for free index entry */
1343 curp = path + depth;
1344 while (i > 0 && !EXT_HAS_FREE_INDEX(curp)) {
1345 i--;
1346 curp--;
1347 }
1348
Randy Dunlapd0d856e2006-10-11 01:21:07 -07001349 /* we use already allocated block for index block,
1350 * so subsequent data blocks should be contiguous */
Alex Tomasa86c6182006-10-11 01:21:03 -07001351 if (EXT_HAS_FREE_INDEX(curp)) {
1352 /* if we found index with free entry, then use that
1353 * entry: create all needed subtree and add new leaf */
Theodore Ts'o107a7bd2013-08-16 21:23:41 -04001354 err = ext4_ext_split(handle, inode, mb_flags, path, newext, i);
Shen Feng787e0982008-07-11 19:27:31 -04001355 if (err)
1356 goto out;
Alex Tomasa86c6182006-10-11 01:21:03 -07001357
1358 /* refill path */
1359 ext4_ext_drop_refs(path);
1360 path = ext4_ext_find_extent(inode,
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05001361 (ext4_lblk_t)le32_to_cpu(newext->ee_block),
Theodore Ts'odfe50802014-09-01 14:37:09 -04001362 ppath, gb_flags);
Alex Tomasa86c6182006-10-11 01:21:03 -07001363 if (IS_ERR(path))
1364 err = PTR_ERR(path);
1365 } else {
1366 /* tree is full, time to grow in depth */
Theodore Ts'o107a7bd2013-08-16 21:23:41 -04001367 err = ext4_ext_grow_indepth(handle, inode, mb_flags, newext);
Alex Tomasa86c6182006-10-11 01:21:03 -07001368 if (err)
1369 goto out;
1370
1371 /* refill path */
1372 ext4_ext_drop_refs(path);
1373 path = ext4_ext_find_extent(inode,
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05001374 (ext4_lblk_t)le32_to_cpu(newext->ee_block),
Theodore Ts'odfe50802014-09-01 14:37:09 -04001375 ppath, gb_flags);
Alex Tomasa86c6182006-10-11 01:21:03 -07001376 if (IS_ERR(path)) {
1377 err = PTR_ERR(path);
1378 goto out;
1379 }
1380
1381 /*
Randy Dunlapd0d856e2006-10-11 01:21:07 -07001382 * only first (depth 0 -> 1) produces free space;
1383 * in all other cases we have to split the grown tree
Alex Tomasa86c6182006-10-11 01:21:03 -07001384 */
1385 depth = ext_depth(inode);
1386 if (path[depth].p_hdr->eh_entries == path[depth].p_hdr->eh_max) {
Randy Dunlapd0d856e2006-10-11 01:21:07 -07001387 /* now we need to split */
Alex Tomasa86c6182006-10-11 01:21:03 -07001388 goto repeat;
1389 }
1390 }
1391
1392out:
1393 return err;
1394}
1395
1396/*
Alex Tomas1988b512008-01-28 23:58:27 -05001397 * search the closest allocated block to the left for *logical
1398 * and returns it at @logical + it's physical address at @phys
1399 * if *logical is the smallest allocated block, the function
1400 * returns 0 at @phys
1401 * return value contains 0 (success) or error code
1402 */
Theodore Ts'o1f109d52010-10-27 21:30:14 -04001403static int ext4_ext_search_left(struct inode *inode,
1404 struct ext4_ext_path *path,
1405 ext4_lblk_t *logical, ext4_fsblk_t *phys)
Alex Tomas1988b512008-01-28 23:58:27 -05001406{
1407 struct ext4_extent_idx *ix;
1408 struct ext4_extent *ex;
Aneesh Kumar K.Vb939e372008-01-28 23:58:27 -05001409 int depth, ee_len;
Alex Tomas1988b512008-01-28 23:58:27 -05001410
Frank Mayhar273df552010-03-02 11:46:09 -05001411 if (unlikely(path == NULL)) {
1412 EXT4_ERROR_INODE(inode, "path == NULL *logical %d!", *logical);
1413 return -EIO;
1414 }
Alex Tomas1988b512008-01-28 23:58:27 -05001415 depth = path->p_depth;
1416 *phys = 0;
1417
1418 if (depth == 0 && path->p_ext == NULL)
1419 return 0;
1420
1421 /* usually extent in the path covers blocks smaller
1422 * then *logical, but it can be that extent is the
1423 * first one in the file */
1424
1425 ex = path[depth].p_ext;
Aneesh Kumar K.Vb939e372008-01-28 23:58:27 -05001426 ee_len = ext4_ext_get_actual_len(ex);
Alex Tomas1988b512008-01-28 23:58:27 -05001427 if (*logical < le32_to_cpu(ex->ee_block)) {
Frank Mayhar273df552010-03-02 11:46:09 -05001428 if (unlikely(EXT_FIRST_EXTENT(path[depth].p_hdr) != ex)) {
1429 EXT4_ERROR_INODE(inode,
1430 "EXT_FIRST_EXTENT != ex *logical %d ee_block %d!",
1431 *logical, le32_to_cpu(ex->ee_block));
1432 return -EIO;
1433 }
Alex Tomas1988b512008-01-28 23:58:27 -05001434 while (--depth >= 0) {
1435 ix = path[depth].p_idx;
Frank Mayhar273df552010-03-02 11:46:09 -05001436 if (unlikely(ix != EXT_FIRST_INDEX(path[depth].p_hdr))) {
1437 EXT4_ERROR_INODE(inode,
1438 "ix (%d) != EXT_FIRST_INDEX (%d) (depth %d)!",
Tao Ma6ee3b212011-10-08 16:08:34 -04001439 ix != NULL ? le32_to_cpu(ix->ei_block) : 0,
Frank Mayhar273df552010-03-02 11:46:09 -05001440 EXT_FIRST_INDEX(path[depth].p_hdr) != NULL ?
Tao Ma6ee3b212011-10-08 16:08:34 -04001441 le32_to_cpu(EXT_FIRST_INDEX(path[depth].p_hdr)->ei_block) : 0,
Frank Mayhar273df552010-03-02 11:46:09 -05001442 depth);
1443 return -EIO;
1444 }
Alex Tomas1988b512008-01-28 23:58:27 -05001445 }
1446 return 0;
1447 }
1448
Frank Mayhar273df552010-03-02 11:46:09 -05001449 if (unlikely(*logical < (le32_to_cpu(ex->ee_block) + ee_len))) {
1450 EXT4_ERROR_INODE(inode,
1451 "logical %d < ee_block %d + ee_len %d!",
1452 *logical, le32_to_cpu(ex->ee_block), ee_len);
1453 return -EIO;
1454 }
Alex Tomas1988b512008-01-28 23:58:27 -05001455
Aneesh Kumar K.Vb939e372008-01-28 23:58:27 -05001456 *logical = le32_to_cpu(ex->ee_block) + ee_len - 1;
Theodore Ts'obf89d162010-10-27 21:30:14 -04001457 *phys = ext4_ext_pblock(ex) + ee_len - 1;
Alex Tomas1988b512008-01-28 23:58:27 -05001458 return 0;
1459}
1460
1461/*
1462 * search the closest allocated block to the right for *logical
1463 * and returns it at @logical + it's physical address at @phys
Tao Madf3ab172011-10-08 15:53:49 -04001464 * if *logical is the largest allocated block, the function
Alex Tomas1988b512008-01-28 23:58:27 -05001465 * returns 0 at @phys
1466 * return value contains 0 (success) or error code
1467 */
Theodore Ts'o1f109d52010-10-27 21:30:14 -04001468static int ext4_ext_search_right(struct inode *inode,
1469 struct ext4_ext_path *path,
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04001470 ext4_lblk_t *logical, ext4_fsblk_t *phys,
1471 struct ext4_extent **ret_ex)
Alex Tomas1988b512008-01-28 23:58:27 -05001472{
1473 struct buffer_head *bh = NULL;
1474 struct ext4_extent_header *eh;
1475 struct ext4_extent_idx *ix;
1476 struct ext4_extent *ex;
1477 ext4_fsblk_t block;
Eric Sandeen395a87b2009-03-10 18:18:47 -04001478 int depth; /* Note, NOT eh_depth; depth from top of tree */
1479 int ee_len;
Alex Tomas1988b512008-01-28 23:58:27 -05001480
Frank Mayhar273df552010-03-02 11:46:09 -05001481 if (unlikely(path == NULL)) {
1482 EXT4_ERROR_INODE(inode, "path == NULL *logical %d!", *logical);
1483 return -EIO;
1484 }
Alex Tomas1988b512008-01-28 23:58:27 -05001485 depth = path->p_depth;
1486 *phys = 0;
1487
1488 if (depth == 0 && path->p_ext == NULL)
1489 return 0;
1490
1491 /* usually extent in the path covers blocks smaller
1492 * then *logical, but it can be that extent is the
1493 * first one in the file */
1494
1495 ex = path[depth].p_ext;
Aneesh Kumar K.Vb939e372008-01-28 23:58:27 -05001496 ee_len = ext4_ext_get_actual_len(ex);
Alex Tomas1988b512008-01-28 23:58:27 -05001497 if (*logical < le32_to_cpu(ex->ee_block)) {
Frank Mayhar273df552010-03-02 11:46:09 -05001498 if (unlikely(EXT_FIRST_EXTENT(path[depth].p_hdr) != ex)) {
1499 EXT4_ERROR_INODE(inode,
1500 "first_extent(path[%d].p_hdr) != ex",
1501 depth);
1502 return -EIO;
1503 }
Alex Tomas1988b512008-01-28 23:58:27 -05001504 while (--depth >= 0) {
1505 ix = path[depth].p_idx;
Frank Mayhar273df552010-03-02 11:46:09 -05001506 if (unlikely(ix != EXT_FIRST_INDEX(path[depth].p_hdr))) {
1507 EXT4_ERROR_INODE(inode,
1508 "ix != EXT_FIRST_INDEX *logical %d!",
1509 *logical);
1510 return -EIO;
1511 }
Alex Tomas1988b512008-01-28 23:58:27 -05001512 }
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04001513 goto found_extent;
Alex Tomas1988b512008-01-28 23:58:27 -05001514 }
1515
Frank Mayhar273df552010-03-02 11:46:09 -05001516 if (unlikely(*logical < (le32_to_cpu(ex->ee_block) + ee_len))) {
1517 EXT4_ERROR_INODE(inode,
1518 "logical %d < ee_block %d + ee_len %d!",
1519 *logical, le32_to_cpu(ex->ee_block), ee_len);
1520 return -EIO;
1521 }
Alex Tomas1988b512008-01-28 23:58:27 -05001522
1523 if (ex != EXT_LAST_EXTENT(path[depth].p_hdr)) {
1524 /* next allocated block in this leaf */
1525 ex++;
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04001526 goto found_extent;
Alex Tomas1988b512008-01-28 23:58:27 -05001527 }
1528
1529 /* go up and search for index to the right */
1530 while (--depth >= 0) {
1531 ix = path[depth].p_idx;
1532 if (ix != EXT_LAST_INDEX(path[depth].p_hdr))
Wu Fengguang25f1ee32008-11-25 17:24:23 -05001533 goto got_index;
Alex Tomas1988b512008-01-28 23:58:27 -05001534 }
1535
Wu Fengguang25f1ee32008-11-25 17:24:23 -05001536 /* we've gone up to the root and found no index to the right */
1537 return 0;
Alex Tomas1988b512008-01-28 23:58:27 -05001538
Wu Fengguang25f1ee32008-11-25 17:24:23 -05001539got_index:
Alex Tomas1988b512008-01-28 23:58:27 -05001540 /* we've found index to the right, let's
1541 * follow it and find the closest allocated
1542 * block to the right */
1543 ix++;
Theodore Ts'obf89d162010-10-27 21:30:14 -04001544 block = ext4_idx_pblock(ix);
Alex Tomas1988b512008-01-28 23:58:27 -05001545 while (++depth < path->p_depth) {
Eric Sandeen395a87b2009-03-10 18:18:47 -04001546 /* subtract from p_depth to get proper eh_depth */
Theodore Ts'o7d7ea892013-08-16 21:20:41 -04001547 bh = read_extent_tree_block(inode, block,
Theodore Ts'o107a7bd2013-08-16 21:23:41 -04001548 path->p_depth - depth, 0);
Theodore Ts'o7d7ea892013-08-16 21:20:41 -04001549 if (IS_ERR(bh))
1550 return PTR_ERR(bh);
1551 eh = ext_block_hdr(bh);
Alex Tomas1988b512008-01-28 23:58:27 -05001552 ix = EXT_FIRST_INDEX(eh);
Theodore Ts'obf89d162010-10-27 21:30:14 -04001553 block = ext4_idx_pblock(ix);
Alex Tomas1988b512008-01-28 23:58:27 -05001554 put_bh(bh);
1555 }
1556
Theodore Ts'o107a7bd2013-08-16 21:23:41 -04001557 bh = read_extent_tree_block(inode, block, path->p_depth - depth, 0);
Theodore Ts'o7d7ea892013-08-16 21:20:41 -04001558 if (IS_ERR(bh))
1559 return PTR_ERR(bh);
Alex Tomas1988b512008-01-28 23:58:27 -05001560 eh = ext_block_hdr(bh);
Alex Tomas1988b512008-01-28 23:58:27 -05001561 ex = EXT_FIRST_EXTENT(eh);
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04001562found_extent:
Alex Tomas1988b512008-01-28 23:58:27 -05001563 *logical = le32_to_cpu(ex->ee_block);
Theodore Ts'obf89d162010-10-27 21:30:14 -04001564 *phys = ext4_ext_pblock(ex);
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04001565 *ret_ex = ex;
1566 if (bh)
1567 put_bh(bh);
Alex Tomas1988b512008-01-28 23:58:27 -05001568 return 0;
Alex Tomas1988b512008-01-28 23:58:27 -05001569}
1570
1571/*
Randy Dunlapd0d856e2006-10-11 01:21:07 -07001572 * ext4_ext_next_allocated_block:
Lukas Czernerf17722f2011-06-06 00:05:17 -04001573 * returns allocated block in subsequent extent or EXT_MAX_BLOCKS.
Randy Dunlapd0d856e2006-10-11 01:21:07 -07001574 * NOTE: it considers block number from index entry as
1575 * allocated block. Thus, index entries have to be consistent
1576 * with leaves.
Alex Tomasa86c6182006-10-11 01:21:03 -07001577 */
Dmitry Monakhovfcf6b1b72014-08-30 23:52:19 -04001578ext4_lblk_t
Alex Tomasa86c6182006-10-11 01:21:03 -07001579ext4_ext_next_allocated_block(struct ext4_ext_path *path)
1580{
1581 int depth;
1582
1583 BUG_ON(path == NULL);
1584 depth = path->p_depth;
1585
1586 if (depth == 0 && path->p_ext == NULL)
Lukas Czernerf17722f2011-06-06 00:05:17 -04001587 return EXT_MAX_BLOCKS;
Alex Tomasa86c6182006-10-11 01:21:03 -07001588
1589 while (depth >= 0) {
1590 if (depth == path->p_depth) {
1591 /* leaf */
Curt Wohlgemuth6f8ff532011-10-26 04:38:59 -04001592 if (path[depth].p_ext &&
1593 path[depth].p_ext !=
Alex Tomasa86c6182006-10-11 01:21:03 -07001594 EXT_LAST_EXTENT(path[depth].p_hdr))
1595 return le32_to_cpu(path[depth].p_ext[1].ee_block);
1596 } else {
1597 /* index */
1598 if (path[depth].p_idx !=
1599 EXT_LAST_INDEX(path[depth].p_hdr))
1600 return le32_to_cpu(path[depth].p_idx[1].ei_block);
1601 }
1602 depth--;
1603 }
1604
Lukas Czernerf17722f2011-06-06 00:05:17 -04001605 return EXT_MAX_BLOCKS;
Alex Tomasa86c6182006-10-11 01:21:03 -07001606}
1607
1608/*
Randy Dunlapd0d856e2006-10-11 01:21:07 -07001609 * ext4_ext_next_leaf_block:
Lukas Czernerf17722f2011-06-06 00:05:17 -04001610 * returns first allocated block from next leaf or EXT_MAX_BLOCKS
Alex Tomasa86c6182006-10-11 01:21:03 -07001611 */
Robin Dong57187892011-07-23 21:49:07 -04001612static ext4_lblk_t ext4_ext_next_leaf_block(struct ext4_ext_path *path)
Alex Tomasa86c6182006-10-11 01:21:03 -07001613{
1614 int depth;
1615
1616 BUG_ON(path == NULL);
1617 depth = path->p_depth;
1618
1619 /* zero-tree has no leaf blocks at all */
1620 if (depth == 0)
Lukas Czernerf17722f2011-06-06 00:05:17 -04001621 return EXT_MAX_BLOCKS;
Alex Tomasa86c6182006-10-11 01:21:03 -07001622
1623 /* go to index block */
1624 depth--;
1625
1626 while (depth >= 0) {
1627 if (path[depth].p_idx !=
1628 EXT_LAST_INDEX(path[depth].p_hdr))
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05001629 return (ext4_lblk_t)
1630 le32_to_cpu(path[depth].p_idx[1].ei_block);
Alex Tomasa86c6182006-10-11 01:21:03 -07001631 depth--;
1632 }
1633
Lukas Czernerf17722f2011-06-06 00:05:17 -04001634 return EXT_MAX_BLOCKS;
Alex Tomasa86c6182006-10-11 01:21:03 -07001635}
1636
1637/*
Randy Dunlapd0d856e2006-10-11 01:21:07 -07001638 * ext4_ext_correct_indexes:
1639 * if leaf gets modified and modified extent is first in the leaf,
1640 * then we have to correct all indexes above.
Alex Tomasa86c6182006-10-11 01:21:03 -07001641 * TODO: do we need to correct tree in all cases?
1642 */
Aneesh Kumar K.V1d03ec92008-01-28 23:58:27 -05001643static int ext4_ext_correct_indexes(handle_t *handle, struct inode *inode,
Alex Tomasa86c6182006-10-11 01:21:03 -07001644 struct ext4_ext_path *path)
1645{
1646 struct ext4_extent_header *eh;
1647 int depth = ext_depth(inode);
1648 struct ext4_extent *ex;
1649 __le32 border;
1650 int k, err = 0;
1651
1652 eh = path[depth].p_hdr;
1653 ex = path[depth].p_ext;
Frank Mayhar273df552010-03-02 11:46:09 -05001654
1655 if (unlikely(ex == NULL || eh == NULL)) {
1656 EXT4_ERROR_INODE(inode,
1657 "ex %p == NULL or eh %p == NULL", ex, eh);
1658 return -EIO;
1659 }
Alex Tomasa86c6182006-10-11 01:21:03 -07001660
1661 if (depth == 0) {
1662 /* there is no tree at all */
1663 return 0;
1664 }
1665
1666 if (ex != EXT_FIRST_EXTENT(eh)) {
1667 /* we correct tree if first leaf got modified only */
1668 return 0;
1669 }
1670
1671 /*
Randy Dunlapd0d856e2006-10-11 01:21:07 -07001672 * TODO: we need correction if border is smaller than current one
Alex Tomasa86c6182006-10-11 01:21:03 -07001673 */
1674 k = depth - 1;
1675 border = path[depth].p_ext->ee_block;
Avantika Mathur7e028972006-12-06 20:41:33 -08001676 err = ext4_ext_get_access(handle, inode, path + k);
1677 if (err)
Alex Tomasa86c6182006-10-11 01:21:03 -07001678 return err;
1679 path[k].p_idx->ei_block = border;
Avantika Mathur7e028972006-12-06 20:41:33 -08001680 err = ext4_ext_dirty(handle, inode, path + k);
1681 if (err)
Alex Tomasa86c6182006-10-11 01:21:03 -07001682 return err;
1683
1684 while (k--) {
1685 /* change all left-side indexes */
1686 if (path[k+1].p_idx != EXT_FIRST_INDEX(path[k+1].p_hdr))
1687 break;
Avantika Mathur7e028972006-12-06 20:41:33 -08001688 err = ext4_ext_get_access(handle, inode, path + k);
1689 if (err)
Alex Tomasa86c6182006-10-11 01:21:03 -07001690 break;
1691 path[k].p_idx->ei_block = border;
Avantika Mathur7e028972006-12-06 20:41:33 -08001692 err = ext4_ext_dirty(handle, inode, path + k);
1693 if (err)
Alex Tomasa86c6182006-10-11 01:21:03 -07001694 break;
1695 }
1696
1697 return err;
1698}
1699
Akira Fujita748de672009-06-17 19:24:03 -04001700int
Alex Tomasa86c6182006-10-11 01:21:03 -07001701ext4_can_extents_be_merged(struct inode *inode, struct ext4_extent *ex1,
1702 struct ext4_extent *ex2)
1703{
Eric Sandeenda0169b2013-11-04 09:58:26 -05001704 unsigned short ext1_ee_len, ext2_ee_len;
Amit Aroraa2df2a62007-07-17 21:42:41 -04001705
1706 /*
Dmitry Monakhovec22ba82013-03-04 00:36:06 -05001707 * Make sure that both extents are initialized. We don't merge
Lukas Czerner556615d2014-04-20 23:45:47 -04001708 * unwritten extents so that we can be sure that end_io code has
Dmitry Monakhovec22ba82013-03-04 00:36:06 -05001709 * the extent that was written properly split out and conversion to
1710 * initialized is trivial.
Amit Aroraa2df2a62007-07-17 21:42:41 -04001711 */
Lukas Czerner556615d2014-04-20 23:45:47 -04001712 if (ext4_ext_is_unwritten(ex1) != ext4_ext_is_unwritten(ex2))
Amit Aroraa2df2a62007-07-17 21:42:41 -04001713 return 0;
1714
1715 ext1_ee_len = ext4_ext_get_actual_len(ex1);
1716 ext2_ee_len = ext4_ext_get_actual_len(ex2);
1717
1718 if (le32_to_cpu(ex1->ee_block) + ext1_ee_len !=
Andrew Morton63f57932006-10-11 01:21:24 -07001719 le32_to_cpu(ex2->ee_block))
Alex Tomasa86c6182006-10-11 01:21:03 -07001720 return 0;
1721
Suparna Bhattacharya471d4012006-10-11 01:21:06 -07001722 /*
1723 * To allow future support for preallocated extents to be added
1724 * as an RO_COMPAT feature, refuse to merge to extents if
Randy Dunlapd0d856e2006-10-11 01:21:07 -07001725 * this can result in the top bit of ee_len being set.
Suparna Bhattacharya471d4012006-10-11 01:21:06 -07001726 */
Eric Sandeenda0169b2013-11-04 09:58:26 -05001727 if (ext1_ee_len + ext2_ee_len > EXT_INIT_MAX_LEN)
Suparna Bhattacharya471d4012006-10-11 01:21:06 -07001728 return 0;
Lukas Czerner556615d2014-04-20 23:45:47 -04001729 if (ext4_ext_is_unwritten(ex1) &&
Darrick J. Wonga9b82412014-02-20 21:17:35 -05001730 (ext4_test_inode_state(inode, EXT4_STATE_DIO_UNWRITTEN) ||
1731 atomic_read(&EXT4_I(inode)->i_unwritten) ||
Lukas Czerner556615d2014-04-20 23:45:47 -04001732 (ext1_ee_len + ext2_ee_len > EXT_UNWRITTEN_MAX_LEN)))
Darrick J. Wonga9b82412014-02-20 21:17:35 -05001733 return 0;
Robert P. J. Daybbf2f9f2007-02-17 19:20:16 +01001734#ifdef AGGRESSIVE_TEST
Aneesh Kumar K.Vb939e372008-01-28 23:58:27 -05001735 if (ext1_ee_len >= 4)
Alex Tomasa86c6182006-10-11 01:21:03 -07001736 return 0;
1737#endif
1738
Theodore Ts'obf89d162010-10-27 21:30:14 -04001739 if (ext4_ext_pblock(ex1) + ext1_ee_len == ext4_ext_pblock(ex2))
Alex Tomasa86c6182006-10-11 01:21:03 -07001740 return 1;
1741 return 0;
1742}
1743
1744/*
Amit Arora56055d32007-07-17 21:42:38 -04001745 * This function tries to merge the "ex" extent to the next extent in the tree.
1746 * It always tries to merge towards right. If you want to merge towards
1747 * left, pass "ex - 1" as argument instead of "ex".
1748 * Returns 0 if the extents (ex and ex+1) were _not_ merged and returns
1749 * 1 if they got merged.
1750 */
Yongqiang Yang197217a2011-05-03 11:45:29 -04001751static int ext4_ext_try_to_merge_right(struct inode *inode,
Theodore Ts'o1f109d52010-10-27 21:30:14 -04001752 struct ext4_ext_path *path,
1753 struct ext4_extent *ex)
Amit Arora56055d32007-07-17 21:42:38 -04001754{
1755 struct ext4_extent_header *eh;
1756 unsigned int depth, len;
Lukas Czerner556615d2014-04-20 23:45:47 -04001757 int merge_done = 0, unwritten;
Amit Arora56055d32007-07-17 21:42:38 -04001758
1759 depth = ext_depth(inode);
1760 BUG_ON(path[depth].p_hdr == NULL);
1761 eh = path[depth].p_hdr;
1762
1763 while (ex < EXT_LAST_EXTENT(eh)) {
1764 if (!ext4_can_extents_be_merged(inode, ex, ex + 1))
1765 break;
1766 /* merge with next extent! */
Lukas Czerner556615d2014-04-20 23:45:47 -04001767 unwritten = ext4_ext_is_unwritten(ex);
Amit Arora56055d32007-07-17 21:42:38 -04001768 ex->ee_len = cpu_to_le16(ext4_ext_get_actual_len(ex)
1769 + ext4_ext_get_actual_len(ex + 1));
Lukas Czerner556615d2014-04-20 23:45:47 -04001770 if (unwritten)
1771 ext4_ext_mark_unwritten(ex);
Amit Arora56055d32007-07-17 21:42:38 -04001772
1773 if (ex + 1 < EXT_LAST_EXTENT(eh)) {
1774 len = (EXT_LAST_EXTENT(eh) - ex - 1)
1775 * sizeof(struct ext4_extent);
1776 memmove(ex + 1, ex + 2, len);
1777 }
Marcin Slusarze8546d02008-04-17 10:38:59 -04001778 le16_add_cpu(&eh->eh_entries, -1);
Amit Arora56055d32007-07-17 21:42:38 -04001779 merge_done = 1;
1780 WARN_ON(eh->eh_entries == 0);
1781 if (!eh->eh_entries)
Theodore Ts'o24676da2010-05-16 21:00:00 -04001782 EXT4_ERROR_INODE(inode, "eh->eh_entries = 0!");
Amit Arora56055d32007-07-17 21:42:38 -04001783 }
1784
1785 return merge_done;
1786}
1787
1788/*
Theodore Ts'oecb94f52012-08-17 09:44:17 -04001789 * This function does a very simple check to see if we can collapse
1790 * an extent tree with a single extent tree leaf block into the inode.
1791 */
1792static void ext4_ext_try_to_merge_up(handle_t *handle,
1793 struct inode *inode,
1794 struct ext4_ext_path *path)
1795{
1796 size_t s;
1797 unsigned max_root = ext4_ext_space_root(inode, 0);
1798 ext4_fsblk_t blk;
1799
1800 if ((path[0].p_depth != 1) ||
1801 (le16_to_cpu(path[0].p_hdr->eh_entries) != 1) ||
1802 (le16_to_cpu(path[1].p_hdr->eh_entries) > max_root))
1803 return;
1804
1805 /*
1806 * We need to modify the block allocation bitmap and the block
1807 * group descriptor to release the extent tree block. If we
1808 * can't get the journal credits, give up.
1809 */
1810 if (ext4_journal_extend(handle, 2))
1811 return;
1812
1813 /*
1814 * Copy the extent data up to the inode
1815 */
1816 blk = ext4_idx_pblock(path[0].p_idx);
1817 s = le16_to_cpu(path[1].p_hdr->eh_entries) *
1818 sizeof(struct ext4_extent_idx);
1819 s += sizeof(struct ext4_extent_header);
1820
1821 memcpy(path[0].p_hdr, path[1].p_hdr, s);
1822 path[0].p_depth = 0;
1823 path[0].p_ext = EXT_FIRST_EXTENT(path[0].p_hdr) +
1824 (path[1].p_ext - EXT_FIRST_EXTENT(path[1].p_hdr));
1825 path[0].p_hdr->eh_max = cpu_to_le16(max_root);
1826
1827 brelse(path[1].p_bh);
1828 ext4_free_blocks(handle, inode, NULL, blk, 1,
Theodore Ts'o71d4f7d2014-07-15 06:02:38 -04001829 EXT4_FREE_BLOCKS_METADATA | EXT4_FREE_BLOCKS_FORGET);
Theodore Ts'oecb94f52012-08-17 09:44:17 -04001830}
1831
1832/*
Yongqiang Yang197217a2011-05-03 11:45:29 -04001833 * This function tries to merge the @ex extent to neighbours in the tree.
1834 * return 1 if merge left else 0.
1835 */
Theodore Ts'oecb94f52012-08-17 09:44:17 -04001836static void ext4_ext_try_to_merge(handle_t *handle,
1837 struct inode *inode,
Yongqiang Yang197217a2011-05-03 11:45:29 -04001838 struct ext4_ext_path *path,
1839 struct ext4_extent *ex) {
1840 struct ext4_extent_header *eh;
1841 unsigned int depth;
1842 int merge_done = 0;
Yongqiang Yang197217a2011-05-03 11:45:29 -04001843
1844 depth = ext_depth(inode);
1845 BUG_ON(path[depth].p_hdr == NULL);
1846 eh = path[depth].p_hdr;
1847
1848 if (ex > EXT_FIRST_EXTENT(eh))
1849 merge_done = ext4_ext_try_to_merge_right(inode, path, ex - 1);
1850
1851 if (!merge_done)
Theodore Ts'oecb94f52012-08-17 09:44:17 -04001852 (void) ext4_ext_try_to_merge_right(inode, path, ex);
Yongqiang Yang197217a2011-05-03 11:45:29 -04001853
Theodore Ts'oecb94f52012-08-17 09:44:17 -04001854 ext4_ext_try_to_merge_up(handle, inode, path);
Yongqiang Yang197217a2011-05-03 11:45:29 -04001855}
1856
1857/*
Amit Arora25d14f92007-05-24 13:04:13 -04001858 * check if a portion of the "newext" extent overlaps with an
1859 * existing extent.
1860 *
1861 * If there is an overlap discovered, it updates the length of the newext
1862 * such that there will be no overlap, and then returns 1.
1863 * If there is no overlap found, it returns 0.
1864 */
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04001865static unsigned int ext4_ext_check_overlap(struct ext4_sb_info *sbi,
1866 struct inode *inode,
Theodore Ts'o1f109d52010-10-27 21:30:14 -04001867 struct ext4_extent *newext,
1868 struct ext4_ext_path *path)
Amit Arora25d14f92007-05-24 13:04:13 -04001869{
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05001870 ext4_lblk_t b1, b2;
Amit Arora25d14f92007-05-24 13:04:13 -04001871 unsigned int depth, len1;
1872 unsigned int ret = 0;
1873
1874 b1 = le32_to_cpu(newext->ee_block);
Amit Aroraa2df2a62007-07-17 21:42:41 -04001875 len1 = ext4_ext_get_actual_len(newext);
Amit Arora25d14f92007-05-24 13:04:13 -04001876 depth = ext_depth(inode);
1877 if (!path[depth].p_ext)
1878 goto out;
Theodore Ts'of5a44db2013-12-20 09:29:35 -05001879 b2 = EXT4_LBLK_CMASK(sbi, le32_to_cpu(path[depth].p_ext->ee_block));
Amit Arora25d14f92007-05-24 13:04:13 -04001880
1881 /*
1882 * get the next allocated block if the extent in the path
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001883 * is before the requested block(s)
Amit Arora25d14f92007-05-24 13:04:13 -04001884 */
1885 if (b2 < b1) {
1886 b2 = ext4_ext_next_allocated_block(path);
Lukas Czernerf17722f2011-06-06 00:05:17 -04001887 if (b2 == EXT_MAX_BLOCKS)
Amit Arora25d14f92007-05-24 13:04:13 -04001888 goto out;
Theodore Ts'of5a44db2013-12-20 09:29:35 -05001889 b2 = EXT4_LBLK_CMASK(sbi, b2);
Amit Arora25d14f92007-05-24 13:04:13 -04001890 }
1891
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05001892 /* check for wrap through zero on extent logical start block*/
Amit Arora25d14f92007-05-24 13:04:13 -04001893 if (b1 + len1 < b1) {
Lukas Czernerf17722f2011-06-06 00:05:17 -04001894 len1 = EXT_MAX_BLOCKS - b1;
Amit Arora25d14f92007-05-24 13:04:13 -04001895 newext->ee_len = cpu_to_le16(len1);
1896 ret = 1;
1897 }
1898
1899 /* check for overlap */
1900 if (b1 + len1 > b2) {
1901 newext->ee_len = cpu_to_le16(b2 - b1);
1902 ret = 1;
1903 }
1904out:
1905 return ret;
1906}
1907
1908/*
Randy Dunlapd0d856e2006-10-11 01:21:07 -07001909 * ext4_ext_insert_extent:
1910 * tries to merge requsted extent into the existing extent or
1911 * inserts requested extent as new one into the tree,
1912 * creating new leaf in the no-space case.
Alex Tomasa86c6182006-10-11 01:21:03 -07001913 */
1914int ext4_ext_insert_extent(handle_t *handle, struct inode *inode,
Theodore Ts'odfe50802014-09-01 14:37:09 -04001915 struct ext4_ext_path **ppath,
Theodore Ts'o107a7bd2013-08-16 21:23:41 -04001916 struct ext4_extent *newext, int gb_flags)
Alex Tomasa86c6182006-10-11 01:21:03 -07001917{
Theodore Ts'odfe50802014-09-01 14:37:09 -04001918 struct ext4_ext_path *path = *ppath;
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001919 struct ext4_extent_header *eh;
Alex Tomasa86c6182006-10-11 01:21:03 -07001920 struct ext4_extent *ex, *fex;
1921 struct ext4_extent *nearex; /* nearest extent */
1922 struct ext4_ext_path *npath = NULL;
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05001923 int depth, len, err;
1924 ext4_lblk_t next;
Lukas Czerner556615d2014-04-20 23:45:47 -04001925 int mb_flags = 0, unwritten;
Alex Tomasa86c6182006-10-11 01:21:03 -07001926
Frank Mayhar273df552010-03-02 11:46:09 -05001927 if (unlikely(ext4_ext_get_actual_len(newext) == 0)) {
1928 EXT4_ERROR_INODE(inode, "ext4_ext_get_actual_len(newext) == 0");
1929 return -EIO;
1930 }
Alex Tomasa86c6182006-10-11 01:21:03 -07001931 depth = ext_depth(inode);
1932 ex = path[depth].p_ext;
Lukas Czernerbe8981b2013-04-03 23:33:28 -04001933 eh = path[depth].p_hdr;
Frank Mayhar273df552010-03-02 11:46:09 -05001934 if (unlikely(path[depth].p_hdr == NULL)) {
1935 EXT4_ERROR_INODE(inode, "path[%d].p_hdr == NULL", depth);
1936 return -EIO;
1937 }
Alex Tomasa86c6182006-10-11 01:21:03 -07001938
1939 /* try to insert block into found extent and return */
Theodore Ts'o107a7bd2013-08-16 21:23:41 -04001940 if (ex && !(gb_flags & EXT4_GET_BLOCKS_PRE_IO)) {
Amit Aroraa2df2a62007-07-17 21:42:41 -04001941
1942 /*
Lukas Czernerbe8981b2013-04-03 23:33:28 -04001943 * Try to see whether we should rather test the extent on
1944 * right from ex, or from the left of ex. This is because
1945 * ext4_ext_find_extent() can return either extent on the
1946 * left, or on the right from the searched position. This
1947 * will make merging more effective.
Amit Aroraa2df2a62007-07-17 21:42:41 -04001948 */
Lukas Czernerbe8981b2013-04-03 23:33:28 -04001949 if (ex < EXT_LAST_EXTENT(eh) &&
1950 (le32_to_cpu(ex->ee_block) +
1951 ext4_ext_get_actual_len(ex) <
1952 le32_to_cpu(newext->ee_block))) {
1953 ex += 1;
1954 goto prepend;
1955 } else if ((ex > EXT_FIRST_EXTENT(eh)) &&
1956 (le32_to_cpu(newext->ee_block) +
1957 ext4_ext_get_actual_len(newext) <
1958 le32_to_cpu(ex->ee_block)))
1959 ex -= 1;
1960
1961 /* Try to append newex to the ex */
1962 if (ext4_can_extents_be_merged(inode, ex, newext)) {
1963 ext_debug("append [%d]%d block to %u:[%d]%d"
1964 "(from %llu)\n",
Lukas Czerner556615d2014-04-20 23:45:47 -04001965 ext4_ext_is_unwritten(newext),
Lukas Czernerbe8981b2013-04-03 23:33:28 -04001966 ext4_ext_get_actual_len(newext),
1967 le32_to_cpu(ex->ee_block),
Lukas Czerner556615d2014-04-20 23:45:47 -04001968 ext4_ext_is_unwritten(ex),
Lukas Czernerbe8981b2013-04-03 23:33:28 -04001969 ext4_ext_get_actual_len(ex),
1970 ext4_ext_pblock(ex));
1971 err = ext4_ext_get_access(handle, inode,
1972 path + depth);
1973 if (err)
1974 return err;
Lukas Czerner556615d2014-04-20 23:45:47 -04001975 unwritten = ext4_ext_is_unwritten(ex);
Lukas Czernerbe8981b2013-04-03 23:33:28 -04001976 ex->ee_len = cpu_to_le16(ext4_ext_get_actual_len(ex)
Amit Aroraa2df2a62007-07-17 21:42:41 -04001977 + ext4_ext_get_actual_len(newext));
Lukas Czerner556615d2014-04-20 23:45:47 -04001978 if (unwritten)
1979 ext4_ext_mark_unwritten(ex);
Lukas Czernerbe8981b2013-04-03 23:33:28 -04001980 eh = path[depth].p_hdr;
1981 nearex = ex;
1982 goto merge;
1983 }
1984
1985prepend:
1986 /* Try to prepend newex to the ex */
1987 if (ext4_can_extents_be_merged(inode, newext, ex)) {
1988 ext_debug("prepend %u[%d]%d block to %u:[%d]%d"
1989 "(from %llu)\n",
1990 le32_to_cpu(newext->ee_block),
Lukas Czerner556615d2014-04-20 23:45:47 -04001991 ext4_ext_is_unwritten(newext),
Lukas Czernerbe8981b2013-04-03 23:33:28 -04001992 ext4_ext_get_actual_len(newext),
1993 le32_to_cpu(ex->ee_block),
Lukas Czerner556615d2014-04-20 23:45:47 -04001994 ext4_ext_is_unwritten(ex),
Lukas Czernerbe8981b2013-04-03 23:33:28 -04001995 ext4_ext_get_actual_len(ex),
1996 ext4_ext_pblock(ex));
1997 err = ext4_ext_get_access(handle, inode,
1998 path + depth);
1999 if (err)
2000 return err;
2001
Lukas Czerner556615d2014-04-20 23:45:47 -04002002 unwritten = ext4_ext_is_unwritten(ex);
Lukas Czernerbe8981b2013-04-03 23:33:28 -04002003 ex->ee_block = newext->ee_block;
2004 ext4_ext_store_pblock(ex, ext4_ext_pblock(newext));
2005 ex->ee_len = cpu_to_le16(ext4_ext_get_actual_len(ex)
2006 + ext4_ext_get_actual_len(newext));
Lukas Czerner556615d2014-04-20 23:45:47 -04002007 if (unwritten)
2008 ext4_ext_mark_unwritten(ex);
Lukas Czernerbe8981b2013-04-03 23:33:28 -04002009 eh = path[depth].p_hdr;
2010 nearex = ex;
2011 goto merge;
2012 }
Alex Tomasa86c6182006-10-11 01:21:03 -07002013 }
2014
Alex Tomasa86c6182006-10-11 01:21:03 -07002015 depth = ext_depth(inode);
2016 eh = path[depth].p_hdr;
2017 if (le16_to_cpu(eh->eh_entries) < le16_to_cpu(eh->eh_max))
2018 goto has_space;
2019
2020 /* probably next leaf has space for us? */
2021 fex = EXT_LAST_EXTENT(eh);
Robin Dong598dbdf2011-07-11 18:24:01 -04002022 next = EXT_MAX_BLOCKS;
2023 if (le32_to_cpu(newext->ee_block) > le32_to_cpu(fex->ee_block))
Robin Dong57187892011-07-23 21:49:07 -04002024 next = ext4_ext_next_leaf_block(path);
Robin Dong598dbdf2011-07-11 18:24:01 -04002025 if (next != EXT_MAX_BLOCKS) {
Yongqiang Yang32de6752011-11-01 18:56:41 -04002026 ext_debug("next leaf block - %u\n", next);
Alex Tomasa86c6182006-10-11 01:21:03 -07002027 BUG_ON(npath != NULL);
Theodore Ts'o107a7bd2013-08-16 21:23:41 -04002028 npath = ext4_ext_find_extent(inode, next, NULL, 0);
Alex Tomasa86c6182006-10-11 01:21:03 -07002029 if (IS_ERR(npath))
2030 return PTR_ERR(npath);
2031 BUG_ON(npath->p_depth != path->p_depth);
2032 eh = npath[depth].p_hdr;
2033 if (le16_to_cpu(eh->eh_entries) < le16_to_cpu(eh->eh_max)) {
Lucas De Marchi25985ed2011-03-30 22:57:33 -03002034 ext_debug("next leaf isn't full(%d)\n",
Alex Tomasa86c6182006-10-11 01:21:03 -07002035 le16_to_cpu(eh->eh_entries));
2036 path = npath;
Robin Dongffb505f2011-07-11 11:43:59 -04002037 goto has_space;
Alex Tomasa86c6182006-10-11 01:21:03 -07002038 }
2039 ext_debug("next leaf has no free space(%d,%d)\n",
2040 le16_to_cpu(eh->eh_entries), le16_to_cpu(eh->eh_max));
2041 }
2042
2043 /*
Randy Dunlapd0d856e2006-10-11 01:21:07 -07002044 * There is no free space in the found leaf.
2045 * We're gonna add a new leaf in the tree.
Alex Tomasa86c6182006-10-11 01:21:03 -07002046 */
Theodore Ts'o107a7bd2013-08-16 21:23:41 -04002047 if (gb_flags & EXT4_GET_BLOCKS_METADATA_NOFAIL)
2048 mb_flags = EXT4_MB_USE_RESERVED;
2049 err = ext4_ext_create_new_leaf(handle, inode, mb_flags, gb_flags,
Theodore Ts'odfe50802014-09-01 14:37:09 -04002050 ppath, newext);
Alex Tomasa86c6182006-10-11 01:21:03 -07002051 if (err)
2052 goto cleanup;
2053 depth = ext_depth(inode);
2054 eh = path[depth].p_hdr;
2055
2056has_space:
2057 nearex = path[depth].p_ext;
2058
Avantika Mathur7e028972006-12-06 20:41:33 -08002059 err = ext4_ext_get_access(handle, inode, path + depth);
2060 if (err)
Alex Tomasa86c6182006-10-11 01:21:03 -07002061 goto cleanup;
2062
2063 if (!nearex) {
2064 /* there is no extent in this leaf, create first one */
Yongqiang Yang32de6752011-11-01 18:56:41 -04002065 ext_debug("first extent in the leaf: %u:%llu:[%d]%d\n",
Dave Kleikamp8c55e202007-05-24 13:04:54 -04002066 le32_to_cpu(newext->ee_block),
Theodore Ts'obf89d162010-10-27 21:30:14 -04002067 ext4_ext_pblock(newext),
Lukas Czerner556615d2014-04-20 23:45:47 -04002068 ext4_ext_is_unwritten(newext),
Amit Aroraa2df2a62007-07-17 21:42:41 -04002069 ext4_ext_get_actual_len(newext));
Eric Gouriou80e675f2011-10-27 11:52:18 -04002070 nearex = EXT_FIRST_EXTENT(eh);
2071 } else {
2072 if (le32_to_cpu(newext->ee_block)
Dave Kleikamp8c55e202007-05-24 13:04:54 -04002073 > le32_to_cpu(nearex->ee_block)) {
Eric Gouriou80e675f2011-10-27 11:52:18 -04002074 /* Insert after */
Yongqiang Yang32de6752011-11-01 18:56:41 -04002075 ext_debug("insert %u:%llu:[%d]%d before: "
2076 "nearest %p\n",
Dave Kleikamp8c55e202007-05-24 13:04:54 -04002077 le32_to_cpu(newext->ee_block),
Theodore Ts'obf89d162010-10-27 21:30:14 -04002078 ext4_ext_pblock(newext),
Lukas Czerner556615d2014-04-20 23:45:47 -04002079 ext4_ext_is_unwritten(newext),
Amit Aroraa2df2a62007-07-17 21:42:41 -04002080 ext4_ext_get_actual_len(newext),
Eric Gouriou80e675f2011-10-27 11:52:18 -04002081 nearex);
2082 nearex++;
2083 } else {
2084 /* Insert before */
2085 BUG_ON(newext->ee_block == nearex->ee_block);
Yongqiang Yang32de6752011-11-01 18:56:41 -04002086 ext_debug("insert %u:%llu:[%d]%d after: "
2087 "nearest %p\n",
Eric Gouriou80e675f2011-10-27 11:52:18 -04002088 le32_to_cpu(newext->ee_block),
2089 ext4_ext_pblock(newext),
Lukas Czerner556615d2014-04-20 23:45:47 -04002090 ext4_ext_is_unwritten(newext),
Eric Gouriou80e675f2011-10-27 11:52:18 -04002091 ext4_ext_get_actual_len(newext),
2092 nearex);
Alex Tomasa86c6182006-10-11 01:21:03 -07002093 }
Eric Gouriou80e675f2011-10-27 11:52:18 -04002094 len = EXT_LAST_EXTENT(eh) - nearex + 1;
2095 if (len > 0) {
Yongqiang Yang32de6752011-11-01 18:56:41 -04002096 ext_debug("insert %u:%llu:[%d]%d: "
Eric Gouriou80e675f2011-10-27 11:52:18 -04002097 "move %d extents from 0x%p to 0x%p\n",
2098 le32_to_cpu(newext->ee_block),
2099 ext4_ext_pblock(newext),
Lukas Czerner556615d2014-04-20 23:45:47 -04002100 ext4_ext_is_unwritten(newext),
Eric Gouriou80e675f2011-10-27 11:52:18 -04002101 ext4_ext_get_actual_len(newext),
2102 len, nearex, nearex + 1);
2103 memmove(nearex + 1, nearex,
2104 len * sizeof(struct ext4_extent));
2105 }
Alex Tomasa86c6182006-10-11 01:21:03 -07002106 }
2107
Marcin Slusarze8546d02008-04-17 10:38:59 -04002108 le16_add_cpu(&eh->eh_entries, 1);
Eric Gouriou80e675f2011-10-27 11:52:18 -04002109 path[depth].p_ext = nearex;
Alex Tomasa86c6182006-10-11 01:21:03 -07002110 nearex->ee_block = newext->ee_block;
Theodore Ts'obf89d162010-10-27 21:30:14 -04002111 ext4_ext_store_pblock(nearex, ext4_ext_pblock(newext));
Alex Tomasa86c6182006-10-11 01:21:03 -07002112 nearex->ee_len = newext->ee_len;
Alex Tomasa86c6182006-10-11 01:21:03 -07002113
2114merge:
HaiboLiue7bcf822012-07-09 16:29:28 -04002115 /* try to merge extents */
Theodore Ts'o107a7bd2013-08-16 21:23:41 -04002116 if (!(gb_flags & EXT4_GET_BLOCKS_PRE_IO))
Theodore Ts'oecb94f52012-08-17 09:44:17 -04002117 ext4_ext_try_to_merge(handle, inode, path, nearex);
Alex Tomasa86c6182006-10-11 01:21:03 -07002118
Alex Tomasa86c6182006-10-11 01:21:03 -07002119
2120 /* time to correct all indexes above */
2121 err = ext4_ext_correct_indexes(handle, inode, path);
2122 if (err)
2123 goto cleanup;
2124
Theodore Ts'oecb94f52012-08-17 09:44:17 -04002125 err = ext4_ext_dirty(handle, inode, path + path->p_depth);
Alex Tomasa86c6182006-10-11 01:21:03 -07002126
2127cleanup:
2128 if (npath) {
2129 ext4_ext_drop_refs(npath);
2130 kfree(npath);
2131 }
Alex Tomasa86c6182006-10-11 01:21:03 -07002132 return err;
2133}
2134
Lukas Czerner91dd8c12012-11-28 12:32:26 -05002135static int ext4_fill_fiemap_extents(struct inode *inode,
2136 ext4_lblk_t block, ext4_lblk_t num,
2137 struct fiemap_extent_info *fieinfo)
Eric Sandeen6873fa02008-10-07 00:46:36 -04002138{
2139 struct ext4_ext_path *path = NULL;
Eric Sandeen6873fa02008-10-07 00:46:36 -04002140 struct ext4_extent *ex;
Zheng Liu69eb33d2013-02-18 00:31:07 -05002141 struct extent_status es;
Lukas Czerner91dd8c12012-11-28 12:32:26 -05002142 ext4_lblk_t next, next_del, start = 0, end = 0;
Eric Sandeen6873fa02008-10-07 00:46:36 -04002143 ext4_lblk_t last = block + num;
Lukas Czerner91dd8c12012-11-28 12:32:26 -05002144 int exists, depth = 0, err = 0;
2145 unsigned int flags = 0;
2146 unsigned char blksize_bits = inode->i_sb->s_blocksize_bits;
Eric Sandeen6873fa02008-10-07 00:46:36 -04002147
Lukas Czernerf17722f2011-06-06 00:05:17 -04002148 while (block < last && block != EXT_MAX_BLOCKS) {
Eric Sandeen6873fa02008-10-07 00:46:36 -04002149 num = last - block;
2150 /* find extent for this block */
Theodore Ts'ofab3a542009-12-09 21:30:02 -05002151 down_read(&EXT4_I(inode)->i_data_sem);
Lukas Czerner91dd8c12012-11-28 12:32:26 -05002152
2153 if (path && ext_depth(inode) != depth) {
2154 /* depth was changed. we have to realloc path */
2155 kfree(path);
2156 path = NULL;
2157 }
2158
Theodore Ts'o705912c2014-09-01 14:34:09 -04002159 path = ext4_ext_find_extent(inode, block, &path, 0);
Eric Sandeen6873fa02008-10-07 00:46:36 -04002160 if (IS_ERR(path)) {
Lukas Czerner91dd8c12012-11-28 12:32:26 -05002161 up_read(&EXT4_I(inode)->i_data_sem);
Eric Sandeen6873fa02008-10-07 00:46:36 -04002162 err = PTR_ERR(path);
2163 path = NULL;
2164 break;
2165 }
2166
2167 depth = ext_depth(inode);
Frank Mayhar273df552010-03-02 11:46:09 -05002168 if (unlikely(path[depth].p_hdr == NULL)) {
Lukas Czerner91dd8c12012-11-28 12:32:26 -05002169 up_read(&EXT4_I(inode)->i_data_sem);
Frank Mayhar273df552010-03-02 11:46:09 -05002170 EXT4_ERROR_INODE(inode, "path[%d].p_hdr == NULL", depth);
2171 err = -EIO;
2172 break;
2173 }
Eric Sandeen6873fa02008-10-07 00:46:36 -04002174 ex = path[depth].p_ext;
2175 next = ext4_ext_next_allocated_block(path);
Lukas Czerner91dd8c12012-11-28 12:32:26 -05002176 ext4_ext_drop_refs(path);
Eric Sandeen6873fa02008-10-07 00:46:36 -04002177
Lukas Czerner91dd8c12012-11-28 12:32:26 -05002178 flags = 0;
Eric Sandeen6873fa02008-10-07 00:46:36 -04002179 exists = 0;
2180 if (!ex) {
2181 /* there is no extent yet, so try to allocate
2182 * all requested space */
2183 start = block;
2184 end = block + num;
2185 } else if (le32_to_cpu(ex->ee_block) > block) {
2186 /* need to allocate space before found extent */
2187 start = block;
2188 end = le32_to_cpu(ex->ee_block);
2189 if (block + num < end)
2190 end = block + num;
2191 } else if (block >= le32_to_cpu(ex->ee_block)
2192 + ext4_ext_get_actual_len(ex)) {
2193 /* need to allocate space after found extent */
2194 start = block;
2195 end = block + num;
2196 if (end >= next)
2197 end = next;
2198 } else if (block >= le32_to_cpu(ex->ee_block)) {
2199 /*
2200 * some part of requested space is covered
2201 * by found extent
2202 */
2203 start = block;
2204 end = le32_to_cpu(ex->ee_block)
2205 + ext4_ext_get_actual_len(ex);
2206 if (block + num < end)
2207 end = block + num;
2208 exists = 1;
2209 } else {
2210 BUG();
2211 }
2212 BUG_ON(end <= start);
2213
2214 if (!exists) {
Zheng Liu69eb33d2013-02-18 00:31:07 -05002215 es.es_lblk = start;
2216 es.es_len = end - start;
2217 es.es_pblk = 0;
Eric Sandeen6873fa02008-10-07 00:46:36 -04002218 } else {
Zheng Liu69eb33d2013-02-18 00:31:07 -05002219 es.es_lblk = le32_to_cpu(ex->ee_block);
2220 es.es_len = ext4_ext_get_actual_len(ex);
2221 es.es_pblk = ext4_ext_pblock(ex);
Lukas Czerner556615d2014-04-20 23:45:47 -04002222 if (ext4_ext_is_unwritten(ex))
Lukas Czerner91dd8c12012-11-28 12:32:26 -05002223 flags |= FIEMAP_EXTENT_UNWRITTEN;
Eric Sandeen6873fa02008-10-07 00:46:36 -04002224 }
2225
Lukas Czerner91dd8c12012-11-28 12:32:26 -05002226 /*
Zheng Liu69eb33d2013-02-18 00:31:07 -05002227 * Find delayed extent and update es accordingly. We call
2228 * it even in !exists case to find out whether es is the
Lukas Czerner91dd8c12012-11-28 12:32:26 -05002229 * last existing extent or not.
2230 */
Zheng Liu69eb33d2013-02-18 00:31:07 -05002231 next_del = ext4_find_delayed_extent(inode, &es);
Lukas Czerner91dd8c12012-11-28 12:32:26 -05002232 if (!exists && next_del) {
2233 exists = 1;
Jie Liu72dac952013-06-12 23:13:59 -04002234 flags |= (FIEMAP_EXTENT_DELALLOC |
2235 FIEMAP_EXTENT_UNKNOWN);
Lukas Czerner91dd8c12012-11-28 12:32:26 -05002236 }
2237 up_read(&EXT4_I(inode)->i_data_sem);
2238
Zheng Liu69eb33d2013-02-18 00:31:07 -05002239 if (unlikely(es.es_len == 0)) {
2240 EXT4_ERROR_INODE(inode, "es.es_len == 0");
Frank Mayhar273df552010-03-02 11:46:09 -05002241 err = -EIO;
2242 break;
2243 }
Eric Sandeen6873fa02008-10-07 00:46:36 -04002244
Zheng Liuf7fec032013-02-18 00:28:47 -05002245 /*
2246 * This is possible iff next == next_del == EXT_MAX_BLOCKS.
2247 * we need to check next == EXT_MAX_BLOCKS because it is
2248 * possible that an extent is with unwritten and delayed
2249 * status due to when an extent is delayed allocated and
2250 * is allocated by fallocate status tree will track both of
2251 * them in a extent.
2252 *
2253 * So we could return a unwritten and delayed extent, and
2254 * its block is equal to 'next'.
2255 */
2256 if (next == next_del && next == EXT_MAX_BLOCKS) {
Lukas Czerner91dd8c12012-11-28 12:32:26 -05002257 flags |= FIEMAP_EXTENT_LAST;
2258 if (unlikely(next_del != EXT_MAX_BLOCKS ||
2259 next != EXT_MAX_BLOCKS)) {
2260 EXT4_ERROR_INODE(inode,
2261 "next extent == %u, next "
2262 "delalloc extent = %u",
2263 next, next_del);
2264 err = -EIO;
2265 break;
2266 }
Eric Sandeen6873fa02008-10-07 00:46:36 -04002267 }
2268
Lukas Czerner91dd8c12012-11-28 12:32:26 -05002269 if (exists) {
2270 err = fiemap_fill_next_extent(fieinfo,
Zheng Liu69eb33d2013-02-18 00:31:07 -05002271 (__u64)es.es_lblk << blksize_bits,
2272 (__u64)es.es_pblk << blksize_bits,
2273 (__u64)es.es_len << blksize_bits,
Lukas Czerner91dd8c12012-11-28 12:32:26 -05002274 flags);
2275 if (err < 0)
2276 break;
2277 if (err == 1) {
2278 err = 0;
2279 break;
2280 }
Eric Sandeen6873fa02008-10-07 00:46:36 -04002281 }
2282
Zheng Liu69eb33d2013-02-18 00:31:07 -05002283 block = es.es_lblk + es.es_len;
Eric Sandeen6873fa02008-10-07 00:46:36 -04002284 }
2285
2286 if (path) {
2287 ext4_ext_drop_refs(path);
2288 kfree(path);
2289 }
2290
2291 return err;
2292}
2293
Alex Tomasa86c6182006-10-11 01:21:03 -07002294/*
Randy Dunlapd0d856e2006-10-11 01:21:07 -07002295 * ext4_ext_put_gap_in_cache:
2296 * calculate boundaries of the gap that the requested block fits into
Alex Tomasa86c6182006-10-11 01:21:03 -07002297 * and cache this gap
2298 */
Avantika Mathur09b88252006-12-06 20:41:36 -08002299static void
Alex Tomasa86c6182006-10-11 01:21:03 -07002300ext4_ext_put_gap_in_cache(struct inode *inode, struct ext4_ext_path *path,
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05002301 ext4_lblk_t block)
Alex Tomasa86c6182006-10-11 01:21:03 -07002302{
2303 int depth = ext_depth(inode);
Andi Shyti27b1b222013-08-28 14:00:00 -04002304 unsigned long len = 0;
2305 ext4_lblk_t lblock = 0;
Alex Tomasa86c6182006-10-11 01:21:03 -07002306 struct ext4_extent *ex;
2307
2308 ex = path[depth].p_ext;
2309 if (ex == NULL) {
Zheng Liu69eb33d2013-02-18 00:31:07 -05002310 /*
2311 * there is no extent yet, so gap is [0;-] and we
2312 * don't cache it
2313 */
Alex Tomasa86c6182006-10-11 01:21:03 -07002314 ext_debug("cache gap(whole file):");
2315 } else if (block < le32_to_cpu(ex->ee_block)) {
2316 lblock = block;
2317 len = le32_to_cpu(ex->ee_block) - block;
Eric Sandeenbba90742008-01-28 23:58:27 -05002318 ext_debug("cache gap(before): %u [%u:%u]",
2319 block,
2320 le32_to_cpu(ex->ee_block),
2321 ext4_ext_get_actual_len(ex));
Zheng Liud100eef2013-02-18 00:29:59 -05002322 if (!ext4_find_delalloc_range(inode, lblock, lblock + len - 1))
2323 ext4_es_insert_extent(inode, lblock, len, ~0,
2324 EXTENT_STATUS_HOLE);
Alex Tomasa86c6182006-10-11 01:21:03 -07002325 } else if (block >= le32_to_cpu(ex->ee_block)
Amit Aroraa2df2a62007-07-17 21:42:41 -04002326 + ext4_ext_get_actual_len(ex)) {
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05002327 ext4_lblk_t next;
Dave Kleikamp8c55e202007-05-24 13:04:54 -04002328 lblock = le32_to_cpu(ex->ee_block)
Amit Aroraa2df2a62007-07-17 21:42:41 -04002329 + ext4_ext_get_actual_len(ex);
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05002330
2331 next = ext4_ext_next_allocated_block(path);
Eric Sandeenbba90742008-01-28 23:58:27 -05002332 ext_debug("cache gap(after): [%u:%u] %u",
2333 le32_to_cpu(ex->ee_block),
2334 ext4_ext_get_actual_len(ex),
2335 block);
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05002336 BUG_ON(next == lblock);
2337 len = next - lblock;
Zheng Liud100eef2013-02-18 00:29:59 -05002338 if (!ext4_find_delalloc_range(inode, lblock, lblock + len - 1))
2339 ext4_es_insert_extent(inode, lblock, len, ~0,
2340 EXTENT_STATUS_HOLE);
Alex Tomasa86c6182006-10-11 01:21:03 -07002341 } else {
Alex Tomasa86c6182006-10-11 01:21:03 -07002342 BUG();
2343 }
2344
Eric Sandeenbba90742008-01-28 23:58:27 -05002345 ext_debug(" -> %u:%lu\n", lblock, len);
Alex Tomasa86c6182006-10-11 01:21:03 -07002346}
2347
2348/*
Randy Dunlapd0d856e2006-10-11 01:21:07 -07002349 * ext4_ext_rm_idx:
2350 * removes index from the index block.
Alex Tomasa86c6182006-10-11 01:21:03 -07002351 */
Aneesh Kumar K.V1d03ec92008-01-28 23:58:27 -05002352static int ext4_ext_rm_idx(handle_t *handle, struct inode *inode,
Forrest Liuc36575e2012-12-17 09:55:39 -05002353 struct ext4_ext_path *path, int depth)
Alex Tomasa86c6182006-10-11 01:21:03 -07002354{
Alex Tomasa86c6182006-10-11 01:21:03 -07002355 int err;
Alex Tomasf65e6fb2006-10-11 01:21:05 -07002356 ext4_fsblk_t leaf;
Alex Tomasa86c6182006-10-11 01:21:03 -07002357
2358 /* free index block */
Forrest Liuc36575e2012-12-17 09:55:39 -05002359 depth--;
2360 path = path + depth;
Theodore Ts'obf89d162010-10-27 21:30:14 -04002361 leaf = ext4_idx_pblock(path->p_idx);
Frank Mayhar273df552010-03-02 11:46:09 -05002362 if (unlikely(path->p_hdr->eh_entries == 0)) {
2363 EXT4_ERROR_INODE(inode, "path->p_hdr->eh_entries == 0");
2364 return -EIO;
2365 }
Avantika Mathur7e028972006-12-06 20:41:33 -08002366 err = ext4_ext_get_access(handle, inode, path);
2367 if (err)
Alex Tomasa86c6182006-10-11 01:21:03 -07002368 return err;
Robin Dong0e1147b2011-07-27 21:29:33 -04002369
2370 if (path->p_idx != EXT_LAST_INDEX(path->p_hdr)) {
2371 int len = EXT_LAST_INDEX(path->p_hdr) - path->p_idx;
2372 len *= sizeof(struct ext4_extent_idx);
2373 memmove(path->p_idx, path->p_idx + 1, len);
2374 }
2375
Marcin Slusarze8546d02008-04-17 10:38:59 -04002376 le16_add_cpu(&path->p_hdr->eh_entries, -1);
Avantika Mathur7e028972006-12-06 20:41:33 -08002377 err = ext4_ext_dirty(handle, inode, path);
2378 if (err)
Alex Tomasa86c6182006-10-11 01:21:03 -07002379 return err;
Mingming Cao2ae02102006-10-11 01:21:11 -07002380 ext_debug("index is empty, remove it, free block %llu\n", leaf);
Aditya Kalid8990242011-09-09 19:18:51 -04002381 trace_ext4_ext_rm_idx(inode, leaf);
2382
Peter Huewe7dc57612011-02-21 21:01:42 -05002383 ext4_free_blocks(handle, inode, NULL, leaf, 1,
Theodore Ts'oe6362602009-11-23 07:17:05 -05002384 EXT4_FREE_BLOCKS_METADATA | EXT4_FREE_BLOCKS_FORGET);
Forrest Liuc36575e2012-12-17 09:55:39 -05002385
2386 while (--depth >= 0) {
2387 if (path->p_idx != EXT_FIRST_INDEX(path->p_hdr))
2388 break;
2389 path--;
2390 err = ext4_ext_get_access(handle, inode, path);
2391 if (err)
2392 break;
2393 path->p_idx->ei_block = (path+1)->p_idx->ei_block;
2394 err = ext4_ext_dirty(handle, inode, path);
2395 if (err)
2396 break;
2397 }
Alex Tomasa86c6182006-10-11 01:21:03 -07002398 return err;
2399}
2400
2401/*
Mingming Caoee12b632008-08-19 22:16:05 -04002402 * ext4_ext_calc_credits_for_single_extent:
2403 * This routine returns max. credits that needed to insert an extent
2404 * to the extent tree.
2405 * When pass the actual path, the caller should calculate credits
2406 * under i_data_sem.
Alex Tomasa86c6182006-10-11 01:21:03 -07002407 */
Mingming Cao525f4ed2008-08-19 22:15:58 -04002408int ext4_ext_calc_credits_for_single_extent(struct inode *inode, int nrblocks,
Alex Tomasa86c6182006-10-11 01:21:03 -07002409 struct ext4_ext_path *path)
2410{
Alex Tomasa86c6182006-10-11 01:21:03 -07002411 if (path) {
Mingming Caoee12b632008-08-19 22:16:05 -04002412 int depth = ext_depth(inode);
Mingming Caof3bd1f32008-08-19 22:16:03 -04002413 int ret = 0;
Mingming Caoee12b632008-08-19 22:16:05 -04002414
Alex Tomasa86c6182006-10-11 01:21:03 -07002415 /* probably there is space in leaf? */
Alex Tomasa86c6182006-10-11 01:21:03 -07002416 if (le16_to_cpu(path[depth].p_hdr->eh_entries)
Mingming Caoee12b632008-08-19 22:16:05 -04002417 < le16_to_cpu(path[depth].p_hdr->eh_max)) {
2418
2419 /*
2420 * There are some space in the leaf tree, no
2421 * need to account for leaf block credit
2422 *
2423 * bitmaps and block group descriptor blocks
Tao Madf3ab172011-10-08 15:53:49 -04002424 * and other metadata blocks still need to be
Mingming Caoee12b632008-08-19 22:16:05 -04002425 * accounted.
2426 */
Mingming Cao525f4ed2008-08-19 22:15:58 -04002427 /* 1 bitmap, 1 block group descriptor */
Mingming Caoee12b632008-08-19 22:16:05 -04002428 ret = 2 + EXT4_META_TRANS_BLOCKS(inode->i_sb);
Aneesh Kumar K.V5887e982009-07-05 23:12:04 -04002429 return ret;
Mingming Caoee12b632008-08-19 22:16:05 -04002430 }
Alex Tomasa86c6182006-10-11 01:21:03 -07002431 }
2432
Mingming Cao525f4ed2008-08-19 22:15:58 -04002433 return ext4_chunk_trans_blocks(inode, nrblocks);
Mingming Caoee12b632008-08-19 22:16:05 -04002434}
Alex Tomasa86c6182006-10-11 01:21:03 -07002435
Mingming Caoee12b632008-08-19 22:16:05 -04002436/*
Jan Karafffb2732013-06-04 13:01:11 -04002437 * How many index/leaf blocks need to change/allocate to add @extents extents?
Mingming Caoee12b632008-08-19 22:16:05 -04002438 *
Jan Karafffb2732013-06-04 13:01:11 -04002439 * If we add a single extent, then in the worse case, each tree level
2440 * index/leaf need to be changed in case of the tree split.
Mingming Caoee12b632008-08-19 22:16:05 -04002441 *
Jan Karafffb2732013-06-04 13:01:11 -04002442 * If more extents are inserted, they could cause the whole tree split more
2443 * than once, but this is really rare.
Mingming Caoee12b632008-08-19 22:16:05 -04002444 */
Jan Karafffb2732013-06-04 13:01:11 -04002445int ext4_ext_index_trans_blocks(struct inode *inode, int extents)
Mingming Caoee12b632008-08-19 22:16:05 -04002446{
2447 int index;
Tao Maf19d5872012-12-10 14:05:51 -05002448 int depth;
2449
2450 /* If we are converting the inline data, only one is needed here. */
2451 if (ext4_has_inline_data(inode))
2452 return 1;
2453
2454 depth = ext_depth(inode);
Alex Tomasa86c6182006-10-11 01:21:03 -07002455
Jan Karafffb2732013-06-04 13:01:11 -04002456 if (extents <= 1)
Mingming Caoee12b632008-08-19 22:16:05 -04002457 index = depth * 2;
2458 else
2459 index = depth * 3;
Alex Tomasa86c6182006-10-11 01:21:03 -07002460
Mingming Caoee12b632008-08-19 22:16:05 -04002461 return index;
Alex Tomasa86c6182006-10-11 01:21:03 -07002462}
2463
Theodore Ts'o981250c2013-06-12 11:48:29 -04002464static inline int get_default_free_blocks_flags(struct inode *inode)
2465{
2466 if (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode))
2467 return EXT4_FREE_BLOCKS_METADATA | EXT4_FREE_BLOCKS_FORGET;
2468 else if (ext4_should_journal_data(inode))
2469 return EXT4_FREE_BLOCKS_FORGET;
2470 return 0;
2471}
2472
Alex Tomasa86c6182006-10-11 01:21:03 -07002473static int ext4_remove_blocks(handle_t *handle, struct inode *inode,
Theodore Ts'o0aa06002011-09-09 18:54:51 -04002474 struct ext4_extent *ex,
Lukas Czernerd23142c2013-05-27 23:33:35 -04002475 long long *partial_cluster,
Theodore Ts'o0aa06002011-09-09 18:54:51 -04002476 ext4_lblk_t from, ext4_lblk_t to)
Alex Tomasa86c6182006-10-11 01:21:03 -07002477{
Theodore Ts'o0aa06002011-09-09 18:54:51 -04002478 struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
Amit Aroraa2df2a62007-07-17 21:42:41 -04002479 unsigned short ee_len = ext4_ext_get_actual_len(ex);
Theodore Ts'o0aa06002011-09-09 18:54:51 -04002480 ext4_fsblk_t pblk;
Theodore Ts'o981250c2013-06-12 11:48:29 -04002481 int flags = get_default_free_blocks_flags(inode);
Andrey Sidorov18888cf2012-09-19 14:14:53 -04002482
Theodore Ts'o0aa06002011-09-09 18:54:51 -04002483 /*
2484 * For bigalloc file systems, we never free a partial cluster
2485 * at the beginning of the extent. Instead, we make a note
2486 * that we tried freeing the cluster, and check to see if we
2487 * need to free it on a subsequent call to ext4_remove_blocks,
2488 * or at the end of the ext4_truncate() operation.
2489 */
2490 flags |= EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER;
2491
Aditya Kalid8990242011-09-09 19:18:51 -04002492 trace_ext4_remove_blocks(inode, ex, from, to, *partial_cluster);
Theodore Ts'o0aa06002011-09-09 18:54:51 -04002493 /*
2494 * If we have a partial cluster, and it's different from the
2495 * cluster of the last block, we need to explicitly free the
2496 * partial cluster here.
2497 */
2498 pblk = ext4_ext_pblock(ex) + ee_len - 1;
Lukas Czernerd23142c2013-05-27 23:33:35 -04002499 if ((*partial_cluster > 0) &&
2500 (EXT4_B2C(sbi, pblk) != *partial_cluster)) {
Theodore Ts'o0aa06002011-09-09 18:54:51 -04002501 ext4_free_blocks(handle, inode, NULL,
2502 EXT4_C2B(sbi, *partial_cluster),
2503 sbi->s_cluster_ratio, flags);
2504 *partial_cluster = 0;
2505 }
2506
Alex Tomasa86c6182006-10-11 01:21:03 -07002507#ifdef EXTENTS_STATS
2508 {
2509 struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
Alex Tomasa86c6182006-10-11 01:21:03 -07002510 spin_lock(&sbi->s_ext_stats_lock);
2511 sbi->s_ext_blocks += ee_len;
2512 sbi->s_ext_extents++;
2513 if (ee_len < sbi->s_ext_min)
2514 sbi->s_ext_min = ee_len;
2515 if (ee_len > sbi->s_ext_max)
2516 sbi->s_ext_max = ee_len;
2517 if (ext_depth(inode) > sbi->s_depth_max)
2518 sbi->s_depth_max = ext_depth(inode);
2519 spin_unlock(&sbi->s_ext_stats_lock);
2520 }
2521#endif
2522 if (from >= le32_to_cpu(ex->ee_block)
Amit Aroraa2df2a62007-07-17 21:42:41 -04002523 && to == le32_to_cpu(ex->ee_block) + ee_len - 1) {
Alex Tomasa86c6182006-10-11 01:21:03 -07002524 /* tail removal */
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05002525 ext4_lblk_t num;
Lukas Czernerd23142c2013-05-27 23:33:35 -04002526 unsigned int unaligned;
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05002527
Amit Aroraa2df2a62007-07-17 21:42:41 -04002528 num = le32_to_cpu(ex->ee_block) + ee_len - from;
Theodore Ts'o0aa06002011-09-09 18:54:51 -04002529 pblk = ext4_ext_pblock(ex) + ee_len - num;
Lukas Czernerd23142c2013-05-27 23:33:35 -04002530 /*
2531 * Usually we want to free partial cluster at the end of the
2532 * extent, except for the situation when the cluster is still
2533 * used by any other extent (partial_cluster is negative).
2534 */
2535 if (*partial_cluster < 0 &&
2536 -(*partial_cluster) == EXT4_B2C(sbi, pblk + num - 1))
2537 flags |= EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER;
2538
2539 ext_debug("free last %u blocks starting %llu partial %lld\n",
2540 num, pblk, *partial_cluster);
Theodore Ts'o0aa06002011-09-09 18:54:51 -04002541 ext4_free_blocks(handle, inode, NULL, pblk, num, flags);
2542 /*
2543 * If the block range to be freed didn't start at the
2544 * beginning of a cluster, and we removed the entire
Lukas Czernerd23142c2013-05-27 23:33:35 -04002545 * extent and the cluster is not used by any other extent,
2546 * save the partial cluster here, since we might need to
2547 * delete if we determine that the truncate operation has
2548 * removed all of the blocks in the cluster.
2549 *
2550 * On the other hand, if we did not manage to free the whole
2551 * extent, we have to mark the cluster as used (store negative
2552 * cluster number in partial_cluster).
Theodore Ts'o0aa06002011-09-09 18:54:51 -04002553 */
Theodore Ts'of5a44db2013-12-20 09:29:35 -05002554 unaligned = EXT4_PBLK_COFF(sbi, pblk);
Lukas Czernerd23142c2013-05-27 23:33:35 -04002555 if (unaligned && (ee_len == num) &&
2556 (*partial_cluster != -((long long)EXT4_B2C(sbi, pblk))))
Theodore Ts'o0aa06002011-09-09 18:54:51 -04002557 *partial_cluster = EXT4_B2C(sbi, pblk);
Lukas Czernerd23142c2013-05-27 23:33:35 -04002558 else if (unaligned)
2559 *partial_cluster = -((long long)EXT4_B2C(sbi, pblk));
2560 else if (*partial_cluster > 0)
Theodore Ts'o0aa06002011-09-09 18:54:51 -04002561 *partial_cluster = 0;
Lukas Czerner78fb9cd2013-05-27 23:32:35 -04002562 } else
2563 ext4_error(sbi->s_sb, "strange request: removal(2) "
2564 "%u-%u from %u:%u\n",
2565 from, to, le32_to_cpu(ex->ee_block), ee_len);
Alex Tomasa86c6182006-10-11 01:21:03 -07002566 return 0;
2567}
2568
Allison Hendersond583fb82011-05-25 07:41:43 -04002569
2570/*
2571 * ext4_ext_rm_leaf() Removes the extents associated with the
2572 * blocks appearing between "start" and "end", and splits the extents
2573 * if "start" and "end" appear in the same extent
2574 *
2575 * @handle: The journal handle
2576 * @inode: The files inode
2577 * @path: The path to the leaf
Lukas Czernerd23142c2013-05-27 23:33:35 -04002578 * @partial_cluster: The cluster which we'll have to free if all extents
2579 * has been released from it. It gets negative in case
2580 * that the cluster is still used.
Allison Hendersond583fb82011-05-25 07:41:43 -04002581 * @start: The first block to remove
2582 * @end: The last block to remove
2583 */
Alex Tomasa86c6182006-10-11 01:21:03 -07002584static int
2585ext4_ext_rm_leaf(handle_t *handle, struct inode *inode,
Lukas Czernerd23142c2013-05-27 23:33:35 -04002586 struct ext4_ext_path *path,
2587 long long *partial_cluster,
Theodore Ts'o0aa06002011-09-09 18:54:51 -04002588 ext4_lblk_t start, ext4_lblk_t end)
Alex Tomasa86c6182006-10-11 01:21:03 -07002589{
Theodore Ts'o0aa06002011-09-09 18:54:51 -04002590 struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
Alex Tomasa86c6182006-10-11 01:21:03 -07002591 int err = 0, correct_index = 0;
2592 int depth = ext_depth(inode), credits;
2593 struct ext4_extent_header *eh;
Dmitry Monakhov750c9c42011-10-25 05:35:05 -04002594 ext4_lblk_t a, b;
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05002595 unsigned num;
2596 ext4_lblk_t ex_ee_block;
Alex Tomasa86c6182006-10-11 01:21:03 -07002597 unsigned short ex_ee_len;
Lukas Czerner556615d2014-04-20 23:45:47 -04002598 unsigned unwritten = 0;
Alex Tomasa86c6182006-10-11 01:21:03 -07002599 struct ext4_extent *ex;
Lukas Czernerd23142c2013-05-27 23:33:35 -04002600 ext4_fsblk_t pblk;
Alex Tomasa86c6182006-10-11 01:21:03 -07002601
Alex Tomasc29c0ae2007-07-18 09:19:09 -04002602 /* the header must be checked already in ext4_ext_remove_space() */
Lukas Czerner5f95d212012-03-19 23:03:19 -04002603 ext_debug("truncate since %u in leaf to %u\n", start, end);
Alex Tomasa86c6182006-10-11 01:21:03 -07002604 if (!path[depth].p_hdr)
2605 path[depth].p_hdr = ext_block_hdr(path[depth].p_bh);
2606 eh = path[depth].p_hdr;
Frank Mayhar273df552010-03-02 11:46:09 -05002607 if (unlikely(path[depth].p_hdr == NULL)) {
2608 EXT4_ERROR_INODE(inode, "path[%d].p_hdr == NULL", depth);
2609 return -EIO;
2610 }
Alex Tomasa86c6182006-10-11 01:21:03 -07002611 /* find where to start removing */
Ashish Sangwan6ae06ff2013-07-01 08:12:41 -04002612 ex = path[depth].p_ext;
2613 if (!ex)
2614 ex = EXT_LAST_EXTENT(eh);
Alex Tomasa86c6182006-10-11 01:21:03 -07002615
2616 ex_ee_block = le32_to_cpu(ex->ee_block);
Amit Aroraa2df2a62007-07-17 21:42:41 -04002617 ex_ee_len = ext4_ext_get_actual_len(ex);
Alex Tomasa86c6182006-10-11 01:21:03 -07002618
Eric Whitneyc0634492014-03-13 23:34:16 -04002619 /*
2620 * If we're starting with an extent other than the last one in the
2621 * node, we need to see if it shares a cluster with the extent to
2622 * the right (towards the end of the file). If its leftmost cluster
2623 * is this extent's rightmost cluster and it is not cluster aligned,
2624 * we'll mark it as a partial that is not to be deallocated.
2625 */
2626
2627 if (ex != EXT_LAST_EXTENT(eh)) {
2628 ext4_fsblk_t current_pblk, right_pblk;
2629 long long current_cluster, right_cluster;
2630
2631 current_pblk = ext4_ext_pblock(ex) + ex_ee_len - 1;
2632 current_cluster = (long long)EXT4_B2C(sbi, current_pblk);
2633 right_pblk = ext4_ext_pblock(ex + 1);
2634 right_cluster = (long long)EXT4_B2C(sbi, right_pblk);
2635 if (current_cluster == right_cluster &&
2636 EXT4_PBLK_COFF(sbi, right_pblk))
2637 *partial_cluster = -right_cluster;
2638 }
2639
Aditya Kalid8990242011-09-09 19:18:51 -04002640 trace_ext4_ext_rm_leaf(inode, start, ex, *partial_cluster);
2641
Alex Tomasa86c6182006-10-11 01:21:03 -07002642 while (ex >= EXT_FIRST_EXTENT(eh) &&
2643 ex_ee_block + ex_ee_len > start) {
Aneesh Kumar K.Va41f2072009-06-10 14:22:55 -04002644
Lukas Czerner556615d2014-04-20 23:45:47 -04002645 if (ext4_ext_is_unwritten(ex))
2646 unwritten = 1;
Aneesh Kumar K.Va41f2072009-06-10 14:22:55 -04002647 else
Lukas Czerner556615d2014-04-20 23:45:47 -04002648 unwritten = 0;
Aneesh Kumar K.Va41f2072009-06-10 14:22:55 -04002649
Mingming553f9002009-09-18 13:34:55 -04002650 ext_debug("remove ext %u:[%d]%d\n", ex_ee_block,
Lukas Czerner556615d2014-04-20 23:45:47 -04002651 unwritten, ex_ee_len);
Alex Tomasa86c6182006-10-11 01:21:03 -07002652 path[depth].p_ext = ex;
2653
2654 a = ex_ee_block > start ? ex_ee_block : start;
Allison Hendersond583fb82011-05-25 07:41:43 -04002655 b = ex_ee_block+ex_ee_len - 1 < end ?
2656 ex_ee_block+ex_ee_len - 1 : end;
Alex Tomasa86c6182006-10-11 01:21:03 -07002657
2658 ext_debug(" border %u:%u\n", a, b);
2659
Allison Hendersond583fb82011-05-25 07:41:43 -04002660 /* If this extent is beyond the end of the hole, skip it */
Lukas Czerner5f95d212012-03-19 23:03:19 -04002661 if (end < ex_ee_block) {
Lukas Czernerd23142c2013-05-27 23:33:35 -04002662 /*
2663 * We're going to skip this extent and move to another,
2664 * so if this extent is not cluster aligned we have
2665 * to mark the current cluster as used to avoid
2666 * accidentally freeing it later on
2667 */
2668 pblk = ext4_ext_pblock(ex);
Theodore Ts'of5a44db2013-12-20 09:29:35 -05002669 if (EXT4_PBLK_COFF(sbi, pblk))
Lukas Czernerd23142c2013-05-27 23:33:35 -04002670 *partial_cluster =
2671 -((long long)EXT4_B2C(sbi, pblk));
Allison Hendersond583fb82011-05-25 07:41:43 -04002672 ex--;
2673 ex_ee_block = le32_to_cpu(ex->ee_block);
2674 ex_ee_len = ext4_ext_get_actual_len(ex);
2675 continue;
Dmitry Monakhov750c9c42011-10-25 05:35:05 -04002676 } else if (b != ex_ee_block + ex_ee_len - 1) {
Lukas Czernerdc1841d2012-03-19 23:07:43 -04002677 EXT4_ERROR_INODE(inode,
2678 "can not handle truncate %u:%u "
2679 "on extent %u:%u",
2680 start, end, ex_ee_block,
2681 ex_ee_block + ex_ee_len - 1);
Dmitry Monakhov750c9c42011-10-25 05:35:05 -04002682 err = -EIO;
2683 goto out;
Alex Tomasa86c6182006-10-11 01:21:03 -07002684 } else if (a != ex_ee_block) {
2685 /* remove tail of the extent */
Dmitry Monakhov750c9c42011-10-25 05:35:05 -04002686 num = a - ex_ee_block;
Alex Tomasa86c6182006-10-11 01:21:03 -07002687 } else {
2688 /* remove whole extent: excellent! */
Alex Tomasa86c6182006-10-11 01:21:03 -07002689 num = 0;
Alex Tomasa86c6182006-10-11 01:21:03 -07002690 }
Theodore Ts'o34071da2008-08-01 21:59:19 -04002691 /*
2692 * 3 for leaf, sb, and inode plus 2 (bmap and group
2693 * descriptor) for each block group; assume two block
2694 * groups plus ex_ee_len/blocks_per_block_group for
2695 * the worst case
2696 */
2697 credits = 7 + 2*(ex_ee_len/EXT4_BLOCKS_PER_GROUP(inode->i_sb));
Alex Tomasa86c6182006-10-11 01:21:03 -07002698 if (ex == EXT_FIRST_EXTENT(eh)) {
2699 correct_index = 1;
2700 credits += (ext_depth(inode)) + 1;
2701 }
Dmitry Monakhov5aca07e2009-12-08 22:42:15 -05002702 credits += EXT4_MAXQUOTAS_TRANS_BLOCKS(inode->i_sb);
Alex Tomasa86c6182006-10-11 01:21:03 -07002703
Jan Kara487caee2009-08-17 22:17:20 -04002704 err = ext4_ext_truncate_extend_restart(handle, inode, credits);
Shen Feng9102e4f2008-07-11 19:27:31 -04002705 if (err)
Alex Tomasa86c6182006-10-11 01:21:03 -07002706 goto out;
Alex Tomasa86c6182006-10-11 01:21:03 -07002707
2708 err = ext4_ext_get_access(handle, inode, path + depth);
2709 if (err)
2710 goto out;
2711
Theodore Ts'o0aa06002011-09-09 18:54:51 -04002712 err = ext4_remove_blocks(handle, inode, ex, partial_cluster,
2713 a, b);
Alex Tomasa86c6182006-10-11 01:21:03 -07002714 if (err)
2715 goto out;
2716
Dmitry Monakhov750c9c42011-10-25 05:35:05 -04002717 if (num == 0)
Randy Dunlapd0d856e2006-10-11 01:21:07 -07002718 /* this extent is removed; mark slot entirely unused */
Alex Tomasf65e6fb2006-10-11 01:21:05 -07002719 ext4_ext_store_pblock(ex, 0);
Alex Tomasa86c6182006-10-11 01:21:03 -07002720
Alex Tomasa86c6182006-10-11 01:21:03 -07002721 ex->ee_len = cpu_to_le16(num);
Amit Arora749269f2007-07-18 09:02:56 -04002722 /*
Lukas Czerner556615d2014-04-20 23:45:47 -04002723 * Do not mark unwritten if all the blocks in the
Amit Arora749269f2007-07-18 09:02:56 -04002724 * extent have been removed.
2725 */
Lukas Czerner556615d2014-04-20 23:45:47 -04002726 if (unwritten && num)
2727 ext4_ext_mark_unwritten(ex);
Allison Hendersond583fb82011-05-25 07:41:43 -04002728 /*
2729 * If the extent was completely released,
2730 * we need to remove it from the leaf
2731 */
2732 if (num == 0) {
Lukas Czernerf17722f2011-06-06 00:05:17 -04002733 if (end != EXT_MAX_BLOCKS - 1) {
Allison Hendersond583fb82011-05-25 07:41:43 -04002734 /*
2735 * For hole punching, we need to scoot all the
2736 * extents up when an extent is removed so that
2737 * we dont have blank extents in the middle
2738 */
2739 memmove(ex, ex+1, (EXT_LAST_EXTENT(eh) - ex) *
2740 sizeof(struct ext4_extent));
2741
2742 /* Now get rid of the one at the end */
2743 memset(EXT_LAST_EXTENT(eh), 0,
2744 sizeof(struct ext4_extent));
2745 }
2746 le16_add_cpu(&eh->eh_entries, -1);
Lukas Czernerd23142c2013-05-27 23:33:35 -04002747 } else if (*partial_cluster > 0)
Theodore Ts'o0aa06002011-09-09 18:54:51 -04002748 *partial_cluster = 0;
Allison Hendersond583fb82011-05-25 07:41:43 -04002749
Dmitry Monakhov750c9c42011-10-25 05:35:05 -04002750 err = ext4_ext_dirty(handle, inode, path + depth);
2751 if (err)
2752 goto out;
2753
Yongqiang Yangbf52c6f2011-11-01 18:59:26 -04002754 ext_debug("new extent: %u:%u:%llu\n", ex_ee_block, num,
Theodore Ts'obf89d162010-10-27 21:30:14 -04002755 ext4_ext_pblock(ex));
Alex Tomasa86c6182006-10-11 01:21:03 -07002756 ex--;
2757 ex_ee_block = le32_to_cpu(ex->ee_block);
Amit Aroraa2df2a62007-07-17 21:42:41 -04002758 ex_ee_len = ext4_ext_get_actual_len(ex);
Alex Tomasa86c6182006-10-11 01:21:03 -07002759 }
2760
2761 if (correct_index && eh->eh_entries)
2762 err = ext4_ext_correct_indexes(handle, inode, path);
2763
Theodore Ts'o0aa06002011-09-09 18:54:51 -04002764 /*
Eric Whitneyad6599a2014-04-01 19:49:30 -04002765 * If there's a partial cluster and at least one extent remains in
2766 * the leaf, free the partial cluster if it isn't shared with the
2767 * current extent. If there's a partial cluster and no extents
2768 * remain in the leaf, it can't be freed here. It can only be
2769 * freed when it's possible to determine if it's not shared with
2770 * any other extent - when the next leaf is processed or when space
2771 * removal is complete.
Theodore Ts'o0aa06002011-09-09 18:54:51 -04002772 */
Eric Whitneyad6599a2014-04-01 19:49:30 -04002773 if (*partial_cluster > 0 && eh->eh_entries &&
Theodore Ts'o0aa06002011-09-09 18:54:51 -04002774 (EXT4_B2C(sbi, ext4_ext_pblock(ex) + ex_ee_len - 1) !=
2775 *partial_cluster)) {
Theodore Ts'o981250c2013-06-12 11:48:29 -04002776 int flags = get_default_free_blocks_flags(inode);
Theodore Ts'o0aa06002011-09-09 18:54:51 -04002777
2778 ext4_free_blocks(handle, inode, NULL,
2779 EXT4_C2B(sbi, *partial_cluster),
2780 sbi->s_cluster_ratio, flags);
2781 *partial_cluster = 0;
2782 }
2783
Alex Tomasa86c6182006-10-11 01:21:03 -07002784 /* if this leaf is free, then we should
2785 * remove it from index block above */
2786 if (err == 0 && eh->eh_entries == 0 && path[depth].p_bh != NULL)
Forrest Liuc36575e2012-12-17 09:55:39 -05002787 err = ext4_ext_rm_idx(handle, inode, path, depth);
Alex Tomasa86c6182006-10-11 01:21:03 -07002788
2789out:
2790 return err;
2791}
2792
2793/*
Randy Dunlapd0d856e2006-10-11 01:21:07 -07002794 * ext4_ext_more_to_rm:
2795 * returns 1 if current index has to be freed (even partial)
Alex Tomasa86c6182006-10-11 01:21:03 -07002796 */
Avantika Mathur09b88252006-12-06 20:41:36 -08002797static int
Alex Tomasa86c6182006-10-11 01:21:03 -07002798ext4_ext_more_to_rm(struct ext4_ext_path *path)
2799{
2800 BUG_ON(path->p_idx == NULL);
2801
2802 if (path->p_idx < EXT_FIRST_INDEX(path->p_hdr))
2803 return 0;
2804
2805 /*
Randy Dunlapd0d856e2006-10-11 01:21:07 -07002806 * if truncate on deeper level happened, it wasn't partial,
Alex Tomasa86c6182006-10-11 01:21:03 -07002807 * so we have to consider current index for truncation
2808 */
2809 if (le16_to_cpu(path->p_hdr->eh_entries) == path->p_block)
2810 return 0;
2811 return 1;
2812}
2813
Theodore Ts'o26a4c0c2013-04-03 12:45:17 -04002814int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start,
2815 ext4_lblk_t end)
Alex Tomasa86c6182006-10-11 01:21:03 -07002816{
2817 struct super_block *sb = inode->i_sb;
2818 int depth = ext_depth(inode);
Ashish Sangwan968dee72012-07-22 22:49:08 -04002819 struct ext4_ext_path *path = NULL;
Lukas Czernerd23142c2013-05-27 23:33:35 -04002820 long long partial_cluster = 0;
Alex Tomasa86c6182006-10-11 01:21:03 -07002821 handle_t *handle;
Dmitry Monakhov6f2080e2012-09-30 23:03:50 -04002822 int i = 0, err = 0;
Alex Tomasa86c6182006-10-11 01:21:03 -07002823
Lukas Czerner5f95d212012-03-19 23:03:19 -04002824 ext_debug("truncate since %u to %u\n", start, end);
Alex Tomasa86c6182006-10-11 01:21:03 -07002825
2826 /* probably first extent we're gonna free will be last in block */
Theodore Ts'o9924a922013-02-08 21:59:22 -05002827 handle = ext4_journal_start(inode, EXT4_HT_TRUNCATE, depth + 1);
Alex Tomasa86c6182006-10-11 01:21:03 -07002828 if (IS_ERR(handle))
2829 return PTR_ERR(handle);
2830
Dmitry Monakhov0617b832010-05-17 01:00:00 -04002831again:
Lukas Czerner61801322013-05-27 23:32:35 -04002832 trace_ext4_ext_remove_space(inode, start, end, depth);
Aditya Kalid8990242011-09-09 19:18:51 -04002833
Alex Tomasa86c6182006-10-11 01:21:03 -07002834 /*
Lukas Czerner5f95d212012-03-19 23:03:19 -04002835 * Check if we are removing extents inside the extent tree. If that
2836 * is the case, we are going to punch a hole inside the extent tree
2837 * so we have to check whether we need to split the extent covering
2838 * the last block to remove so we can easily remove the part of it
2839 * in ext4_ext_rm_leaf().
2840 */
2841 if (end < EXT_MAX_BLOCKS - 1) {
2842 struct ext4_extent *ex;
2843 ext4_lblk_t ee_block;
2844
2845 /* find extent for this block */
Theodore Ts'o107a7bd2013-08-16 21:23:41 -04002846 path = ext4_ext_find_extent(inode, end, NULL, EXT4_EX_NOCACHE);
Lukas Czerner5f95d212012-03-19 23:03:19 -04002847 if (IS_ERR(path)) {
2848 ext4_journal_stop(handle);
2849 return PTR_ERR(path);
2850 }
2851 depth = ext_depth(inode);
Dmitry Monakhov6f2080e2012-09-30 23:03:50 -04002852 /* Leaf not may not exist only if inode has no blocks at all */
Lukas Czerner5f95d212012-03-19 23:03:19 -04002853 ex = path[depth].p_ext;
Ashish Sangwan968dee72012-07-22 22:49:08 -04002854 if (!ex) {
Dmitry Monakhov6f2080e2012-09-30 23:03:50 -04002855 if (depth) {
2856 EXT4_ERROR_INODE(inode,
2857 "path[%d].p_hdr == NULL",
2858 depth);
2859 err = -EIO;
2860 }
2861 goto out;
Ashish Sangwan968dee72012-07-22 22:49:08 -04002862 }
Lukas Czerner5f95d212012-03-19 23:03:19 -04002863
2864 ee_block = le32_to_cpu(ex->ee_block);
2865
2866 /*
2867 * See if the last block is inside the extent, if so split
2868 * the extent at 'end' block so we can easily remove the
2869 * tail of the first part of the split extent in
2870 * ext4_ext_rm_leaf().
2871 */
2872 if (end >= ee_block &&
2873 end < ee_block + ext4_ext_get_actual_len(ex) - 1) {
Lukas Czerner5f95d212012-03-19 23:03:19 -04002874 /*
2875 * Split the extent in two so that 'end' is the last
Lukas Czerner27dd4382013-04-09 22:11:22 -04002876 * block in the first new extent. Also we should not
2877 * fail removing space due to ENOSPC so try to use
2878 * reserved block if that happens.
Lukas Czerner5f95d212012-03-19 23:03:19 -04002879 */
Theodore Ts'odfe50802014-09-01 14:37:09 -04002880 err = ext4_force_split_extent_at(handle, inode, &path,
Dmitry Monakhovfcf6b1b72014-08-30 23:52:19 -04002881 end + 1, 1);
Lukas Czerner5f95d212012-03-19 23:03:19 -04002882 if (err < 0)
2883 goto out;
2884 }
Lukas Czerner5f95d212012-03-19 23:03:19 -04002885 }
Lukas Czerner5f95d212012-03-19 23:03:19 -04002886 /*
Randy Dunlapd0d856e2006-10-11 01:21:07 -07002887 * We start scanning from right side, freeing all the blocks
2888 * after i_size and walking into the tree depth-wise.
Alex Tomasa86c6182006-10-11 01:21:03 -07002889 */
Dmitry Monakhov0617b832010-05-17 01:00:00 -04002890 depth = ext_depth(inode);
Ashish Sangwan968dee72012-07-22 22:49:08 -04002891 if (path) {
2892 int k = i = depth;
2893 while (--k > 0)
2894 path[k].p_block =
2895 le16_to_cpu(path[k].p_hdr->eh_entries)+1;
2896 } else {
2897 path = kzalloc(sizeof(struct ext4_ext_path) * (depth + 1),
2898 GFP_NOFS);
2899 if (path == NULL) {
2900 ext4_journal_stop(handle);
2901 return -ENOMEM;
2902 }
2903 path[0].p_depth = depth;
2904 path[0].p_hdr = ext_inode_hdr(inode);
Theodore Ts'o89a4e482012-08-17 08:54:52 -04002905 i = 0;
Lukas Czerner5f95d212012-03-19 23:03:19 -04002906
Theodore Ts'oc3491792013-08-16 21:21:41 -04002907 if (ext4_ext_check(inode, path[0].p_hdr, depth, 0)) {
Ashish Sangwan968dee72012-07-22 22:49:08 -04002908 err = -EIO;
2909 goto out;
2910 }
Alex Tomasa86c6182006-10-11 01:21:03 -07002911 }
Ashish Sangwan968dee72012-07-22 22:49:08 -04002912 err = 0;
Alex Tomasa86c6182006-10-11 01:21:03 -07002913
2914 while (i >= 0 && err == 0) {
2915 if (i == depth) {
2916 /* this is leaf block */
Allison Hendersond583fb82011-05-25 07:41:43 -04002917 err = ext4_ext_rm_leaf(handle, inode, path,
Theodore Ts'o0aa06002011-09-09 18:54:51 -04002918 &partial_cluster, start,
Lukas Czerner5f95d212012-03-19 23:03:19 -04002919 end);
Randy Dunlapd0d856e2006-10-11 01:21:07 -07002920 /* root level has p_bh == NULL, brelse() eats this */
Alex Tomasa86c6182006-10-11 01:21:03 -07002921 brelse(path[i].p_bh);
2922 path[i].p_bh = NULL;
2923 i--;
2924 continue;
2925 }
2926
2927 /* this is index block */
2928 if (!path[i].p_hdr) {
2929 ext_debug("initialize header\n");
2930 path[i].p_hdr = ext_block_hdr(path[i].p_bh);
Alex Tomasa86c6182006-10-11 01:21:03 -07002931 }
2932
Alex Tomasa86c6182006-10-11 01:21:03 -07002933 if (!path[i].p_idx) {
Randy Dunlapd0d856e2006-10-11 01:21:07 -07002934 /* this level hasn't been touched yet */
Alex Tomasa86c6182006-10-11 01:21:03 -07002935 path[i].p_idx = EXT_LAST_INDEX(path[i].p_hdr);
2936 path[i].p_block = le16_to_cpu(path[i].p_hdr->eh_entries)+1;
2937 ext_debug("init index ptr: hdr 0x%p, num %d\n",
2938 path[i].p_hdr,
2939 le16_to_cpu(path[i].p_hdr->eh_entries));
2940 } else {
Randy Dunlapd0d856e2006-10-11 01:21:07 -07002941 /* we were already here, see at next index */
Alex Tomasa86c6182006-10-11 01:21:03 -07002942 path[i].p_idx--;
2943 }
2944
2945 ext_debug("level %d - index, first 0x%p, cur 0x%p\n",
2946 i, EXT_FIRST_INDEX(path[i].p_hdr),
2947 path[i].p_idx);
2948 if (ext4_ext_more_to_rm(path + i)) {
Alex Tomasc29c0ae2007-07-18 09:19:09 -04002949 struct buffer_head *bh;
Alex Tomasa86c6182006-10-11 01:21:03 -07002950 /* go to the next level */
Mingming Cao2ae02102006-10-11 01:21:11 -07002951 ext_debug("move to level %d (block %llu)\n",
Theodore Ts'obf89d162010-10-27 21:30:14 -04002952 i + 1, ext4_idx_pblock(path[i].p_idx));
Alex Tomasa86c6182006-10-11 01:21:03 -07002953 memset(path + i + 1, 0, sizeof(*path));
Theodore Ts'o7d7ea892013-08-16 21:20:41 -04002954 bh = read_extent_tree_block(inode,
Theodore Ts'o107a7bd2013-08-16 21:23:41 -04002955 ext4_idx_pblock(path[i].p_idx), depth - i - 1,
2956 EXT4_EX_NOCACHE);
Theodore Ts'o7d7ea892013-08-16 21:20:41 -04002957 if (IS_ERR(bh)) {
Alex Tomasa86c6182006-10-11 01:21:03 -07002958 /* should we reset i_size? */
Theodore Ts'o7d7ea892013-08-16 21:20:41 -04002959 err = PTR_ERR(bh);
Alex Tomasa86c6182006-10-11 01:21:03 -07002960 break;
2961 }
Theodore Ts'o76828c82013-07-15 12:27:47 -04002962 /* Yield here to deal with large extent trees.
2963 * Should be a no-op if we did IO above. */
2964 cond_resched();
Alex Tomasc29c0ae2007-07-18 09:19:09 -04002965 if (WARN_ON(i + 1 > depth)) {
2966 err = -EIO;
2967 break;
2968 }
Alex Tomasc29c0ae2007-07-18 09:19:09 -04002969 path[i + 1].p_bh = bh;
Alex Tomasa86c6182006-10-11 01:21:03 -07002970
Randy Dunlapd0d856e2006-10-11 01:21:07 -07002971 /* save actual number of indexes since this
2972 * number is changed at the next iteration */
Alex Tomasa86c6182006-10-11 01:21:03 -07002973 path[i].p_block = le16_to_cpu(path[i].p_hdr->eh_entries);
2974 i++;
2975 } else {
Randy Dunlapd0d856e2006-10-11 01:21:07 -07002976 /* we finished processing this index, go up */
Alex Tomasa86c6182006-10-11 01:21:03 -07002977 if (path[i].p_hdr->eh_entries == 0 && i > 0) {
Randy Dunlapd0d856e2006-10-11 01:21:07 -07002978 /* index is empty, remove it;
Alex Tomasa86c6182006-10-11 01:21:03 -07002979 * handle must be already prepared by the
2980 * truncatei_leaf() */
Forrest Liuc36575e2012-12-17 09:55:39 -05002981 err = ext4_ext_rm_idx(handle, inode, path, i);
Alex Tomasa86c6182006-10-11 01:21:03 -07002982 }
Randy Dunlapd0d856e2006-10-11 01:21:07 -07002983 /* root level has p_bh == NULL, brelse() eats this */
Alex Tomasa86c6182006-10-11 01:21:03 -07002984 brelse(path[i].p_bh);
2985 path[i].p_bh = NULL;
2986 i--;
2987 ext_debug("return to level %d\n", i);
2988 }
2989 }
2990
Lukas Czerner61801322013-05-27 23:32:35 -04002991 trace_ext4_ext_remove_space_done(inode, start, end, depth,
2992 partial_cluster, path->p_hdr->eh_entries);
Aditya Kalid8990242011-09-09 19:18:51 -04002993
Aditya Kali7b415bf2011-09-09 19:04:51 -04002994 /* If we still have something in the partial cluster and we have removed
2995 * even the first extent, then we should free the blocks in the partial
2996 * cluster as well. */
Lukas Czernerd23142c2013-05-27 23:33:35 -04002997 if (partial_cluster > 0 && path->p_hdr->eh_entries == 0) {
Theodore Ts'o981250c2013-06-12 11:48:29 -04002998 int flags = get_default_free_blocks_flags(inode);
Aditya Kali7b415bf2011-09-09 19:04:51 -04002999
3000 ext4_free_blocks(handle, inode, NULL,
3001 EXT4_C2B(EXT4_SB(sb), partial_cluster),
3002 EXT4_SB(sb)->s_cluster_ratio, flags);
3003 partial_cluster = 0;
3004 }
3005
Alex Tomasa86c6182006-10-11 01:21:03 -07003006 /* TODO: flexible tree reduction should be here */
3007 if (path->p_hdr->eh_entries == 0) {
3008 /*
Randy Dunlapd0d856e2006-10-11 01:21:07 -07003009 * truncate to zero freed all the tree,
3010 * so we need to correct eh_depth
Alex Tomasa86c6182006-10-11 01:21:03 -07003011 */
3012 err = ext4_ext_get_access(handle, inode, path);
3013 if (err == 0) {
3014 ext_inode_hdr(inode)->eh_depth = 0;
3015 ext_inode_hdr(inode)->eh_max =
Theodore Ts'o55ad63b2009-08-28 10:40:33 -04003016 cpu_to_le16(ext4_ext_space_root(inode, 0));
Alex Tomasa86c6182006-10-11 01:21:03 -07003017 err = ext4_ext_dirty(handle, inode, path);
3018 }
3019 }
3020out:
Theodore Ts'odfe50802014-09-01 14:37:09 -04003021 if (path) {
3022 ext4_ext_drop_refs(path);
3023 kfree(path);
Ashish Sangwan968dee72012-07-22 22:49:08 -04003024 path = NULL;
Ashish Sangwan968dee72012-07-22 22:49:08 -04003025 }
Theodore Ts'odfe50802014-09-01 14:37:09 -04003026 if (err == -EAGAIN)
3027 goto again;
Alex Tomasa86c6182006-10-11 01:21:03 -07003028 ext4_journal_stop(handle);
3029
3030 return err;
3031}
3032
3033/*
3034 * called at mount time
3035 */
3036void ext4_ext_init(struct super_block *sb)
3037{
3038 /*
3039 * possible initialization would be here
3040 */
3041
Theodore Ts'o83982b62009-01-06 14:53:16 -05003042 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS)) {
Theodore Ts'o90576c02009-09-29 15:51:30 -04003043#if defined(AGGRESSIVE_TEST) || defined(CHECK_BINSEARCH) || defined(EXTENTS_STATS)
Theodore Ts'o92b97812012-03-19 23:41:49 -04003044 printk(KERN_INFO "EXT4-fs: file extents enabled"
Robert P. J. Daybbf2f9f2007-02-17 19:20:16 +01003045#ifdef AGGRESSIVE_TEST
Theodore Ts'o92b97812012-03-19 23:41:49 -04003046 ", aggressive tests"
Alex Tomasa86c6182006-10-11 01:21:03 -07003047#endif
3048#ifdef CHECK_BINSEARCH
Theodore Ts'o92b97812012-03-19 23:41:49 -04003049 ", check binsearch"
Alex Tomasa86c6182006-10-11 01:21:03 -07003050#endif
3051#ifdef EXTENTS_STATS
Theodore Ts'o92b97812012-03-19 23:41:49 -04003052 ", stats"
Alex Tomasa86c6182006-10-11 01:21:03 -07003053#endif
Theodore Ts'o92b97812012-03-19 23:41:49 -04003054 "\n");
Theodore Ts'o90576c02009-09-29 15:51:30 -04003055#endif
Alex Tomasa86c6182006-10-11 01:21:03 -07003056#ifdef EXTENTS_STATS
3057 spin_lock_init(&EXT4_SB(sb)->s_ext_stats_lock);
3058 EXT4_SB(sb)->s_ext_min = 1 << 30;
3059 EXT4_SB(sb)->s_ext_max = 0;
3060#endif
3061 }
3062}
3063
3064/*
3065 * called at umount time
3066 */
3067void ext4_ext_release(struct super_block *sb)
3068{
Theodore Ts'o83982b62009-01-06 14:53:16 -05003069 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS))
Alex Tomasa86c6182006-10-11 01:21:03 -07003070 return;
3071
3072#ifdef EXTENTS_STATS
3073 if (EXT4_SB(sb)->s_ext_blocks && EXT4_SB(sb)->s_ext_extents) {
3074 struct ext4_sb_info *sbi = EXT4_SB(sb);
3075 printk(KERN_ERR "EXT4-fs: %lu blocks in %lu extents (%lu ave)\n",
3076 sbi->s_ext_blocks, sbi->s_ext_extents,
3077 sbi->s_ext_blocks / sbi->s_ext_extents);
3078 printk(KERN_ERR "EXT4-fs: extents: %lu min, %lu max, max depth %lu\n",
3079 sbi->s_ext_min, sbi->s_ext_max, sbi->s_depth_max);
3080 }
3081#endif
3082}
3083
Zheng Liud7b2a002013-08-28 14:47:06 -04003084static int ext4_zeroout_es(struct inode *inode, struct ext4_extent *ex)
3085{
3086 ext4_lblk_t ee_block;
3087 ext4_fsblk_t ee_pblock;
3088 unsigned int ee_len;
3089
3090 ee_block = le32_to_cpu(ex->ee_block);
3091 ee_len = ext4_ext_get_actual_len(ex);
3092 ee_pblock = ext4_ext_pblock(ex);
3093
3094 if (ee_len == 0)
3095 return 0;
3096
3097 return ext4_es_insert_extent(inode, ee_block, ee_len, ee_pblock,
3098 EXTENT_STATUS_WRITTEN);
3099}
3100
Aneesh Kumar K.V093a0882008-04-29 08:11:12 -04003101/* FIXME!! we need to try to merge to left or right after zero-out */
3102static int ext4_ext_zeroout(struct inode *inode, struct ext4_extent *ex)
3103{
Lukas Czerner24075182010-10-27 21:30:06 -04003104 ext4_fsblk_t ee_pblock;
3105 unsigned int ee_len;
Jing Zhangb7203032010-05-12 00:00:00 -04003106 int ret;
Aneesh Kumar K.V093a0882008-04-29 08:11:12 -04003107
Aneesh Kumar K.V093a0882008-04-29 08:11:12 -04003108 ee_len = ext4_ext_get_actual_len(ex);
Theodore Ts'obf89d162010-10-27 21:30:14 -04003109 ee_pblock = ext4_ext_pblock(ex);
Aneesh Kumar K.V093a0882008-04-29 08:11:12 -04003110
Theodore Ts'oa107e5a2010-10-27 23:44:47 -04003111 ret = sb_issue_zeroout(inode->i_sb, ee_pblock, ee_len, GFP_NOFS);
Lukas Czerner24075182010-10-27 21:30:06 -04003112 if (ret > 0)
3113 ret = 0;
Aneesh Kumar K.V093a0882008-04-29 08:11:12 -04003114
Lukas Czerner24075182010-10-27 21:30:06 -04003115 return ret;
Aneesh Kumar K.V093a0882008-04-29 08:11:12 -04003116}
3117
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003118/*
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003119 * ext4_split_extent_at() splits an extent at given block.
3120 *
3121 * @handle: the journal handle
3122 * @inode: the file inode
3123 * @path: the path to the extent
3124 * @split: the logical block where the extent is splitted.
3125 * @split_flags: indicates if the extent could be zeroout if split fails, and
Lukas Czerner556615d2014-04-20 23:45:47 -04003126 * the states(init or unwritten) of new extents.
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003127 * @flags: flags used to insert new extent to extent tree.
3128 *
3129 *
3130 * Splits extent [a, b] into two extents [a, @split) and [@split, b], states
3131 * of which are deterimined by split_flag.
3132 *
3133 * There are two cases:
3134 * a> the extent are splitted into two extent.
3135 * b> split is not needed, and just mark the extent.
3136 *
3137 * return 0 on success.
3138 */
3139static int ext4_split_extent_at(handle_t *handle,
3140 struct inode *inode,
Theodore Ts'odfe50802014-09-01 14:37:09 -04003141 struct ext4_ext_path **ppath,
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003142 ext4_lblk_t split,
3143 int split_flag,
3144 int flags)
3145{
Theodore Ts'odfe50802014-09-01 14:37:09 -04003146 struct ext4_ext_path *path = *ppath;
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003147 ext4_fsblk_t newblock;
3148 ext4_lblk_t ee_block;
Zheng Liuadb23552013-03-10 21:13:05 -04003149 struct ext4_extent *ex, newex, orig_ex, zero_ex;
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003150 struct ext4_extent *ex2 = NULL;
3151 unsigned int ee_len, depth;
3152 int err = 0;
3153
Dmitry Monakhovdee1f972012-10-10 01:04:58 -04003154 BUG_ON((split_flag & (EXT4_EXT_DATA_VALID1 | EXT4_EXT_DATA_VALID2)) ==
3155 (EXT4_EXT_DATA_VALID1 | EXT4_EXT_DATA_VALID2));
3156
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003157 ext_debug("ext4_split_extents_at: inode %lu, logical"
3158 "block %llu\n", inode->i_ino, (unsigned long long)split);
3159
3160 ext4_ext_show_leaf(inode, path);
3161
3162 depth = ext_depth(inode);
3163 ex = path[depth].p_ext;
3164 ee_block = le32_to_cpu(ex->ee_block);
3165 ee_len = ext4_ext_get_actual_len(ex);
3166 newblock = split - ee_block + ext4_ext_pblock(ex);
3167
3168 BUG_ON(split < ee_block || split >= (ee_block + ee_len));
Lukas Czerner556615d2014-04-20 23:45:47 -04003169 BUG_ON(!ext4_ext_is_unwritten(ex) &&
Dmitry Monakhov357b66f2013-03-04 00:34:34 -05003170 split_flag & (EXT4_EXT_MAY_ZEROOUT |
Lukas Czerner556615d2014-04-20 23:45:47 -04003171 EXT4_EXT_MARK_UNWRIT1 |
3172 EXT4_EXT_MARK_UNWRIT2));
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003173
3174 err = ext4_ext_get_access(handle, inode, path + depth);
3175 if (err)
3176 goto out;
3177
3178 if (split == ee_block) {
3179 /*
3180 * case b: block @split is the block that the extent begins with
3181 * then we just change the state of the extent, and splitting
3182 * is not needed.
3183 */
Lukas Czerner556615d2014-04-20 23:45:47 -04003184 if (split_flag & EXT4_EXT_MARK_UNWRIT2)
3185 ext4_ext_mark_unwritten(ex);
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003186 else
3187 ext4_ext_mark_initialized(ex);
3188
3189 if (!(flags & EXT4_GET_BLOCKS_PRE_IO))
Theodore Ts'oecb94f52012-08-17 09:44:17 -04003190 ext4_ext_try_to_merge(handle, inode, path, ex);
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003191
Theodore Ts'oecb94f52012-08-17 09:44:17 -04003192 err = ext4_ext_dirty(handle, inode, path + path->p_depth);
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003193 goto out;
3194 }
3195
3196 /* case a */
3197 memcpy(&orig_ex, ex, sizeof(orig_ex));
3198 ex->ee_len = cpu_to_le16(split - ee_block);
Lukas Czerner556615d2014-04-20 23:45:47 -04003199 if (split_flag & EXT4_EXT_MARK_UNWRIT1)
3200 ext4_ext_mark_unwritten(ex);
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003201
3202 /*
3203 * path may lead to new leaf, not to original leaf any more
3204 * after ext4_ext_insert_extent() returns,
3205 */
3206 err = ext4_ext_dirty(handle, inode, path + depth);
3207 if (err)
3208 goto fix_extent_len;
3209
3210 ex2 = &newex;
3211 ex2->ee_block = cpu_to_le32(split);
3212 ex2->ee_len = cpu_to_le16(ee_len - (split - ee_block));
3213 ext4_ext_store_pblock(ex2, newblock);
Lukas Czerner556615d2014-04-20 23:45:47 -04003214 if (split_flag & EXT4_EXT_MARK_UNWRIT2)
3215 ext4_ext_mark_unwritten(ex2);
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003216
Theodore Ts'odfe50802014-09-01 14:37:09 -04003217 err = ext4_ext_insert_extent(handle, inode, ppath, &newex, flags);
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003218 if (err == -ENOSPC && (EXT4_EXT_MAY_ZEROOUT & split_flag)) {
Dmitry Monakhovdee1f972012-10-10 01:04:58 -04003219 if (split_flag & (EXT4_EXT_DATA_VALID1|EXT4_EXT_DATA_VALID2)) {
Zheng Liuadb23552013-03-10 21:13:05 -04003220 if (split_flag & EXT4_EXT_DATA_VALID1) {
Dmitry Monakhovdee1f972012-10-10 01:04:58 -04003221 err = ext4_ext_zeroout(inode, ex2);
Zheng Liuadb23552013-03-10 21:13:05 -04003222 zero_ex.ee_block = ex2->ee_block;
Zheng Liu8cde7ad2013-04-03 12:27:18 -04003223 zero_ex.ee_len = cpu_to_le16(
3224 ext4_ext_get_actual_len(ex2));
Zheng Liuadb23552013-03-10 21:13:05 -04003225 ext4_ext_store_pblock(&zero_ex,
3226 ext4_ext_pblock(ex2));
3227 } else {
Dmitry Monakhovdee1f972012-10-10 01:04:58 -04003228 err = ext4_ext_zeroout(inode, ex);
Zheng Liuadb23552013-03-10 21:13:05 -04003229 zero_ex.ee_block = ex->ee_block;
Zheng Liu8cde7ad2013-04-03 12:27:18 -04003230 zero_ex.ee_len = cpu_to_le16(
3231 ext4_ext_get_actual_len(ex));
Zheng Liuadb23552013-03-10 21:13:05 -04003232 ext4_ext_store_pblock(&zero_ex,
3233 ext4_ext_pblock(ex));
3234 }
3235 } else {
Dmitry Monakhovdee1f972012-10-10 01:04:58 -04003236 err = ext4_ext_zeroout(inode, &orig_ex);
Zheng Liuadb23552013-03-10 21:13:05 -04003237 zero_ex.ee_block = orig_ex.ee_block;
Zheng Liu8cde7ad2013-04-03 12:27:18 -04003238 zero_ex.ee_len = cpu_to_le16(
3239 ext4_ext_get_actual_len(&orig_ex));
Zheng Liuadb23552013-03-10 21:13:05 -04003240 ext4_ext_store_pblock(&zero_ex,
3241 ext4_ext_pblock(&orig_ex));
3242 }
Dmitry Monakhovdee1f972012-10-10 01:04:58 -04003243
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003244 if (err)
3245 goto fix_extent_len;
3246 /* update the extent length and mark as initialized */
Al Viroaf1584f2012-04-12 20:32:25 -04003247 ex->ee_len = cpu_to_le16(ee_len);
Theodore Ts'oecb94f52012-08-17 09:44:17 -04003248 ext4_ext_try_to_merge(handle, inode, path, ex);
3249 err = ext4_ext_dirty(handle, inode, path + path->p_depth);
Zheng Liuadb23552013-03-10 21:13:05 -04003250 if (err)
3251 goto fix_extent_len;
3252
3253 /* update extent status tree */
Zheng Liud7b2a002013-08-28 14:47:06 -04003254 err = ext4_zeroout_es(inode, &zero_ex);
Zheng Liuadb23552013-03-10 21:13:05 -04003255
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003256 goto out;
3257 } else if (err)
3258 goto fix_extent_len;
3259
3260out:
3261 ext4_ext_show_leaf(inode, path);
3262 return err;
3263
3264fix_extent_len:
3265 ex->ee_len = orig_ex.ee_len;
Dmitry Monakhov29faed12014-07-27 22:30:29 -04003266 ext4_ext_dirty(handle, inode, path + path->p_depth);
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003267 return err;
3268}
3269
3270/*
3271 * ext4_split_extents() splits an extent and mark extent which is covered
3272 * by @map as split_flags indicates
3273 *
Anatol Pomozov70261f52013-08-28 14:40:12 -04003274 * It may result in splitting the extent into multiple extents (up to three)
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003275 * There are three possibilities:
3276 * a> There is no split required
3277 * b> Splits in two extents: Split is happening at either end of the extent
3278 * c> Splits in three extents: Somone is splitting in middle of the extent
3279 *
3280 */
3281static int ext4_split_extent(handle_t *handle,
3282 struct inode *inode,
Theodore Ts'odfe50802014-09-01 14:37:09 -04003283 struct ext4_ext_path **ppath,
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003284 struct ext4_map_blocks *map,
3285 int split_flag,
3286 int flags)
3287{
Theodore Ts'odfe50802014-09-01 14:37:09 -04003288 struct ext4_ext_path *path = *ppath;
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003289 ext4_lblk_t ee_block;
3290 struct ext4_extent *ex;
3291 unsigned int ee_len, depth;
3292 int err = 0;
Lukas Czerner556615d2014-04-20 23:45:47 -04003293 int unwritten;
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003294 int split_flag1, flags1;
Zheng Liu3a225672013-03-10 21:20:23 -04003295 int allocated = map->m_len;
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003296
3297 depth = ext_depth(inode);
3298 ex = path[depth].p_ext;
3299 ee_block = le32_to_cpu(ex->ee_block);
3300 ee_len = ext4_ext_get_actual_len(ex);
Lukas Czerner556615d2014-04-20 23:45:47 -04003301 unwritten = ext4_ext_is_unwritten(ex);
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003302
3303 if (map->m_lblk + map->m_len < ee_block + ee_len) {
Dmitry Monakhovdee1f972012-10-10 01:04:58 -04003304 split_flag1 = split_flag & EXT4_EXT_MAY_ZEROOUT;
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003305 flags1 = flags | EXT4_GET_BLOCKS_PRE_IO;
Lukas Czerner556615d2014-04-20 23:45:47 -04003306 if (unwritten)
3307 split_flag1 |= EXT4_EXT_MARK_UNWRIT1 |
3308 EXT4_EXT_MARK_UNWRIT2;
Dmitry Monakhovdee1f972012-10-10 01:04:58 -04003309 if (split_flag & EXT4_EXT_DATA_VALID2)
3310 split_flag1 |= EXT4_EXT_DATA_VALID1;
Theodore Ts'odfe50802014-09-01 14:37:09 -04003311 err = ext4_split_extent_at(handle, inode, ppath,
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003312 map->m_lblk + map->m_len, split_flag1, flags1);
Yongqiang Yang93917412011-05-22 20:49:12 -04003313 if (err)
3314 goto out;
Zheng Liu3a225672013-03-10 21:20:23 -04003315 } else {
3316 allocated = ee_len - (map->m_lblk - ee_block);
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003317 }
Dmitry Monakhov357b66f2013-03-04 00:34:34 -05003318 /*
3319 * Update path is required because previous ext4_split_extent_at() may
3320 * result in split of original leaf or extent zeroout.
3321 */
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003322 ext4_ext_drop_refs(path);
Theodore Ts'odfe50802014-09-01 14:37:09 -04003323 path = ext4_ext_find_extent(inode, map->m_lblk, ppath, 0);
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003324 if (IS_ERR(path))
3325 return PTR_ERR(path);
Dmitry Monakhov357b66f2013-03-04 00:34:34 -05003326 depth = ext_depth(inode);
3327 ex = path[depth].p_ext;
Dmitry Monakhova18ed352014-04-13 15:41:13 -04003328 if (!ex) {
3329 EXT4_ERROR_INODE(inode, "unexpected hole at %lu",
3330 (unsigned long) map->m_lblk);
3331 return -EIO;
3332 }
Lukas Czerner556615d2014-04-20 23:45:47 -04003333 unwritten = ext4_ext_is_unwritten(ex);
Dmitry Monakhov357b66f2013-03-04 00:34:34 -05003334 split_flag1 = 0;
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003335
3336 if (map->m_lblk >= ee_block) {
Dmitry Monakhov357b66f2013-03-04 00:34:34 -05003337 split_flag1 = split_flag & EXT4_EXT_DATA_VALID2;
Lukas Czerner556615d2014-04-20 23:45:47 -04003338 if (unwritten) {
3339 split_flag1 |= EXT4_EXT_MARK_UNWRIT1;
Dmitry Monakhov357b66f2013-03-04 00:34:34 -05003340 split_flag1 |= split_flag & (EXT4_EXT_MAY_ZEROOUT |
Lukas Czerner556615d2014-04-20 23:45:47 -04003341 EXT4_EXT_MARK_UNWRIT2);
Dmitry Monakhov357b66f2013-03-04 00:34:34 -05003342 }
Theodore Ts'odfe50802014-09-01 14:37:09 -04003343 err = ext4_split_extent_at(handle, inode, ppath,
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003344 map->m_lblk, split_flag1, flags);
3345 if (err)
3346 goto out;
3347 }
3348
3349 ext4_ext_show_leaf(inode, path);
3350out:
Zheng Liu3a225672013-03-10 21:20:23 -04003351 return err ? err : allocated;
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003352}
3353
Amit Arora56055d32007-07-17 21:42:38 -04003354/*
Theodore Ts'oe35fd662010-05-16 19:00:00 -04003355 * This function is called by ext4_ext_map_blocks() if someone tries to write
Lukas Czerner556615d2014-04-20 23:45:47 -04003356 * to an unwritten extent. It may result in splitting the unwritten
Lucas De Marchi25985ed2011-03-30 22:57:33 -03003357 * extent into multiple extents (up to three - one initialized and two
Lukas Czerner556615d2014-04-20 23:45:47 -04003358 * unwritten).
Amit Arora56055d32007-07-17 21:42:38 -04003359 * There are three possibilities:
3360 * a> There is no split required: Entire extent should be initialized
3361 * b> Splits in two extents: Write is happening at either end of the extent
3362 * c> Splits in three extents: Somone is writing in middle of the extent
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003363 *
3364 * Pre-conditions:
Lukas Czerner556615d2014-04-20 23:45:47 -04003365 * - The extent pointed to by 'path' is unwritten.
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003366 * - The extent pointed to by 'path' contains a superset
3367 * of the logical span [map->m_lblk, map->m_lblk + map->m_len).
3368 *
3369 * Post-conditions on success:
3370 * - the returned value is the number of blocks beyond map->l_lblk
3371 * that are allocated and initialized.
3372 * It is guaranteed to be >= map->m_len.
Amit Arora56055d32007-07-17 21:42:38 -04003373 */
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05003374static int ext4_ext_convert_to_initialized(handle_t *handle,
Theodore Ts'oe35fd662010-05-16 19:00:00 -04003375 struct inode *inode,
3376 struct ext4_map_blocks *map,
Theodore Ts'odfe50802014-09-01 14:37:09 -04003377 struct ext4_ext_path **ppath,
Lukas Czerner27dd4382013-04-09 22:11:22 -04003378 int flags)
Amit Arora56055d32007-07-17 21:42:38 -04003379{
Theodore Ts'odfe50802014-09-01 14:37:09 -04003380 struct ext4_ext_path *path = *ppath;
Zheng Liu67a5da52012-08-17 09:54:17 -04003381 struct ext4_sb_info *sbi;
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003382 struct ext4_extent_header *eh;
Yongqiang Yang667eff32011-05-03 12:25:07 -04003383 struct ext4_map_blocks split_map;
3384 struct ext4_extent zero_ex;
Lukas Czernerbc2d9db2013-04-03 23:33:27 -04003385 struct ext4_extent *ex, *abut_ex;
Dmitry Monakhov21ca0872010-05-16 06:00:00 -04003386 ext4_lblk_t ee_block, eof_block;
Lukas Czernerbc2d9db2013-04-03 23:33:27 -04003387 unsigned int ee_len, depth, map_len = map->m_len;
3388 int allocated = 0, max_zeroout = 0;
Amit Arora56055d32007-07-17 21:42:38 -04003389 int err = 0;
Yongqiang Yang667eff32011-05-03 12:25:07 -04003390 int split_flag = 0;
Dmitry Monakhov21ca0872010-05-16 06:00:00 -04003391
3392 ext_debug("ext4_ext_convert_to_initialized: inode %lu, logical"
3393 "block %llu, max_blocks %u\n", inode->i_ino,
Lukas Czernerbc2d9db2013-04-03 23:33:27 -04003394 (unsigned long long)map->m_lblk, map_len);
Dmitry Monakhov21ca0872010-05-16 06:00:00 -04003395
Zheng Liu67a5da52012-08-17 09:54:17 -04003396 sbi = EXT4_SB(inode->i_sb);
Dmitry Monakhov21ca0872010-05-16 06:00:00 -04003397 eof_block = (inode->i_size + inode->i_sb->s_blocksize - 1) >>
3398 inode->i_sb->s_blocksize_bits;
Lukas Czernerbc2d9db2013-04-03 23:33:27 -04003399 if (eof_block < map->m_lblk + map_len)
3400 eof_block = map->m_lblk + map_len;
Amit Arora56055d32007-07-17 21:42:38 -04003401
3402 depth = ext_depth(inode);
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003403 eh = path[depth].p_hdr;
Amit Arora56055d32007-07-17 21:42:38 -04003404 ex = path[depth].p_ext;
3405 ee_block = le32_to_cpu(ex->ee_block);
3406 ee_len = ext4_ext_get_actual_len(ex);
Zheng Liuadb23552013-03-10 21:13:05 -04003407 zero_ex.ee_len = 0;
Dmitry Monakhov21ca0872010-05-16 06:00:00 -04003408
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003409 trace_ext4_ext_convert_to_initialized_enter(inode, map, ex);
3410
3411 /* Pre-conditions */
Lukas Czerner556615d2014-04-20 23:45:47 -04003412 BUG_ON(!ext4_ext_is_unwritten(ex));
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003413 BUG_ON(!in_range(map->m_lblk, ee_block, ee_len));
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003414
3415 /*
3416 * Attempt to transfer newly initialized blocks from the currently
Lukas Czerner556615d2014-04-20 23:45:47 -04003417 * unwritten extent to its neighbor. This is much cheaper
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003418 * than an insertion followed by a merge as those involve costly
Lukas Czernerbc2d9db2013-04-03 23:33:27 -04003419 * memmove() calls. Transferring to the left is the common case in
3420 * steady state for workloads doing fallocate(FALLOC_FL_KEEP_SIZE)
3421 * followed by append writes.
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003422 *
3423 * Limitations of the current logic:
Lukas Czernerbc2d9db2013-04-03 23:33:27 -04003424 * - L1: we do not deal with writes covering the whole extent.
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003425 * This would require removing the extent if the transfer
3426 * is possible.
Lukas Czernerbc2d9db2013-04-03 23:33:27 -04003427 * - L2: we only attempt to merge with an extent stored in the
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003428 * same extent tree node.
3429 */
Lukas Czernerbc2d9db2013-04-03 23:33:27 -04003430 if ((map->m_lblk == ee_block) &&
3431 /* See if we can merge left */
3432 (map_len < ee_len) && /*L1*/
3433 (ex > EXT_FIRST_EXTENT(eh))) { /*L2*/
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003434 ext4_lblk_t prev_lblk;
3435 ext4_fsblk_t prev_pblk, ee_pblk;
Lukas Czernerbc2d9db2013-04-03 23:33:27 -04003436 unsigned int prev_len;
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003437
Lukas Czernerbc2d9db2013-04-03 23:33:27 -04003438 abut_ex = ex - 1;
3439 prev_lblk = le32_to_cpu(abut_ex->ee_block);
3440 prev_len = ext4_ext_get_actual_len(abut_ex);
3441 prev_pblk = ext4_ext_pblock(abut_ex);
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003442 ee_pblk = ext4_ext_pblock(ex);
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003443
3444 /*
Lukas Czernerbc2d9db2013-04-03 23:33:27 -04003445 * A transfer of blocks from 'ex' to 'abut_ex' is allowed
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003446 * upon those conditions:
Lukas Czernerbc2d9db2013-04-03 23:33:27 -04003447 * - C1: abut_ex is initialized,
3448 * - C2: abut_ex is logically abutting ex,
3449 * - C3: abut_ex is physically abutting ex,
3450 * - C4: abut_ex can receive the additional blocks without
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003451 * overflowing the (initialized) length limit.
3452 */
Lukas Czerner556615d2014-04-20 23:45:47 -04003453 if ((!ext4_ext_is_unwritten(abut_ex)) && /*C1*/
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003454 ((prev_lblk + prev_len) == ee_block) && /*C2*/
3455 ((prev_pblk + prev_len) == ee_pblk) && /*C3*/
Lukas Czernerbc2d9db2013-04-03 23:33:27 -04003456 (prev_len < (EXT_INIT_MAX_LEN - map_len))) { /*C4*/
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003457 err = ext4_ext_get_access(handle, inode, path + depth);
3458 if (err)
3459 goto out;
3460
3461 trace_ext4_ext_convert_to_initialized_fastpath(inode,
Lukas Czernerbc2d9db2013-04-03 23:33:27 -04003462 map, ex, abut_ex);
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003463
Lukas Czernerbc2d9db2013-04-03 23:33:27 -04003464 /* Shift the start of ex by 'map_len' blocks */
3465 ex->ee_block = cpu_to_le32(ee_block + map_len);
3466 ext4_ext_store_pblock(ex, ee_pblk + map_len);
3467 ex->ee_len = cpu_to_le16(ee_len - map_len);
Lukas Czerner556615d2014-04-20 23:45:47 -04003468 ext4_ext_mark_unwritten(ex); /* Restore the flag */
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003469
Lukas Czernerbc2d9db2013-04-03 23:33:27 -04003470 /* Extend abut_ex by 'map_len' blocks */
3471 abut_ex->ee_len = cpu_to_le16(prev_len + map_len);
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003472
3473 /* Result: number of initialized blocks past m_lblk */
Lukas Czernerbc2d9db2013-04-03 23:33:27 -04003474 allocated = map_len;
3475 }
3476 } else if (((map->m_lblk + map_len) == (ee_block + ee_len)) &&
3477 (map_len < ee_len) && /*L1*/
3478 ex < EXT_LAST_EXTENT(eh)) { /*L2*/
3479 /* See if we can merge right */
3480 ext4_lblk_t next_lblk;
3481 ext4_fsblk_t next_pblk, ee_pblk;
3482 unsigned int next_len;
3483
3484 abut_ex = ex + 1;
3485 next_lblk = le32_to_cpu(abut_ex->ee_block);
3486 next_len = ext4_ext_get_actual_len(abut_ex);
3487 next_pblk = ext4_ext_pblock(abut_ex);
3488 ee_pblk = ext4_ext_pblock(ex);
3489
3490 /*
3491 * A transfer of blocks from 'ex' to 'abut_ex' is allowed
3492 * upon those conditions:
3493 * - C1: abut_ex is initialized,
3494 * - C2: abut_ex is logically abutting ex,
3495 * - C3: abut_ex is physically abutting ex,
3496 * - C4: abut_ex can receive the additional blocks without
3497 * overflowing the (initialized) length limit.
3498 */
Lukas Czerner556615d2014-04-20 23:45:47 -04003499 if ((!ext4_ext_is_unwritten(abut_ex)) && /*C1*/
Lukas Czernerbc2d9db2013-04-03 23:33:27 -04003500 ((map->m_lblk + map_len) == next_lblk) && /*C2*/
3501 ((ee_pblk + ee_len) == next_pblk) && /*C3*/
3502 (next_len < (EXT_INIT_MAX_LEN - map_len))) { /*C4*/
3503 err = ext4_ext_get_access(handle, inode, path + depth);
3504 if (err)
3505 goto out;
3506
3507 trace_ext4_ext_convert_to_initialized_fastpath(inode,
3508 map, ex, abut_ex);
3509
3510 /* Shift the start of abut_ex by 'map_len' blocks */
3511 abut_ex->ee_block = cpu_to_le32(next_lblk - map_len);
3512 ext4_ext_store_pblock(abut_ex, next_pblk - map_len);
3513 ex->ee_len = cpu_to_le16(ee_len - map_len);
Lukas Czerner556615d2014-04-20 23:45:47 -04003514 ext4_ext_mark_unwritten(ex); /* Restore the flag */
Lukas Czernerbc2d9db2013-04-03 23:33:27 -04003515
3516 /* Extend abut_ex by 'map_len' blocks */
3517 abut_ex->ee_len = cpu_to_le16(next_len + map_len);
3518
3519 /* Result: number of initialized blocks past m_lblk */
3520 allocated = map_len;
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003521 }
3522 }
Lukas Czernerbc2d9db2013-04-03 23:33:27 -04003523 if (allocated) {
3524 /* Mark the block containing both extents as dirty */
3525 ext4_ext_dirty(handle, inode, path + depth);
3526
3527 /* Update path to point to the right extent */
3528 path[depth].p_ext = abut_ex;
3529 goto out;
3530 } else
3531 allocated = ee_len - (map->m_lblk - ee_block);
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003532
Yongqiang Yang667eff32011-05-03 12:25:07 -04003533 WARN_ON(map->m_lblk < ee_block);
Dmitry Monakhov21ca0872010-05-16 06:00:00 -04003534 /*
3535 * It is safe to convert extent to initialized via explicit
Yongqiang Yang9e740562014-01-06 14:05:23 -05003536 * zeroout only if extent is fully inside i_size or new_size.
Dmitry Monakhov21ca0872010-05-16 06:00:00 -04003537 */
Yongqiang Yang667eff32011-05-03 12:25:07 -04003538 split_flag |= ee_block + ee_len <= eof_block ? EXT4_EXT_MAY_ZEROOUT : 0;
Dmitry Monakhov21ca0872010-05-16 06:00:00 -04003539
Zheng Liu67a5da52012-08-17 09:54:17 -04003540 if (EXT4_EXT_MAY_ZEROOUT & split_flag)
3541 max_zeroout = sbi->s_extent_max_zeroout_kb >>
Lukas Czerner4f42f802013-03-12 12:40:04 -04003542 (inode->i_sb->s_blocksize_bits - 10);
Zheng Liu67a5da52012-08-17 09:54:17 -04003543
3544 /* If extent is less than s_max_zeroout_kb, zeroout directly */
3545 if (max_zeroout && (ee_len <= max_zeroout)) {
Yongqiang Yang667eff32011-05-03 12:25:07 -04003546 err = ext4_ext_zeroout(inode, ex);
Aneesh Kumar K.V3977c962008-04-17 10:38:59 -04003547 if (err)
Aneesh Kumar K.Vd03856b2008-08-02 18:51:32 -04003548 goto out;
Zheng Liuadb23552013-03-10 21:13:05 -04003549 zero_ex.ee_block = ex->ee_block;
Zheng Liu8cde7ad2013-04-03 12:27:18 -04003550 zero_ex.ee_len = cpu_to_le16(ext4_ext_get_actual_len(ex));
Zheng Liuadb23552013-03-10 21:13:05 -04003551 ext4_ext_store_pblock(&zero_ex, ext4_ext_pblock(ex));
Aneesh Kumar K.Vd03856b2008-08-02 18:51:32 -04003552
3553 err = ext4_ext_get_access(handle, inode, path + depth);
3554 if (err)
3555 goto out;
Yongqiang Yang667eff32011-05-03 12:25:07 -04003556 ext4_ext_mark_initialized(ex);
Theodore Ts'oecb94f52012-08-17 09:44:17 -04003557 ext4_ext_try_to_merge(handle, inode, path, ex);
3558 err = ext4_ext_dirty(handle, inode, path + path->p_depth);
Yongqiang Yang667eff32011-05-03 12:25:07 -04003559 goto out;
Amit Arora56055d32007-07-17 21:42:38 -04003560 }
Yongqiang Yang667eff32011-05-03 12:25:07 -04003561
Amit Arora56055d32007-07-17 21:42:38 -04003562 /*
Yongqiang Yang667eff32011-05-03 12:25:07 -04003563 * four cases:
3564 * 1. split the extent into three extents.
3565 * 2. split the extent into two extents, zeroout the first half.
3566 * 3. split the extent into two extents, zeroout the second half.
3567 * 4. split the extent into two extents with out zeroout.
Amit Arora56055d32007-07-17 21:42:38 -04003568 */
Yongqiang Yang667eff32011-05-03 12:25:07 -04003569 split_map.m_lblk = map->m_lblk;
3570 split_map.m_len = map->m_len;
3571
Zheng Liu67a5da52012-08-17 09:54:17 -04003572 if (max_zeroout && (allocated > map->m_len)) {
3573 if (allocated <= max_zeroout) {
Yongqiang Yang667eff32011-05-03 12:25:07 -04003574 /* case 3 */
3575 zero_ex.ee_block =
Allison Henderson9b940f82011-05-16 10:11:09 -04003576 cpu_to_le32(map->m_lblk);
3577 zero_ex.ee_len = cpu_to_le16(allocated);
Yongqiang Yang667eff32011-05-03 12:25:07 -04003578 ext4_ext_store_pblock(&zero_ex,
3579 ext4_ext_pblock(ex) + map->m_lblk - ee_block);
3580 err = ext4_ext_zeroout(inode, &zero_ex);
Amit Arora56055d32007-07-17 21:42:38 -04003581 if (err)
3582 goto out;
Yongqiang Yang667eff32011-05-03 12:25:07 -04003583 split_map.m_lblk = map->m_lblk;
3584 split_map.m_len = allocated;
Zheng Liu67a5da52012-08-17 09:54:17 -04003585 } else if (map->m_lblk - ee_block + map->m_len < max_zeroout) {
Yongqiang Yang667eff32011-05-03 12:25:07 -04003586 /* case 2 */
3587 if (map->m_lblk != ee_block) {
3588 zero_ex.ee_block = ex->ee_block;
3589 zero_ex.ee_len = cpu_to_le16(map->m_lblk -
3590 ee_block);
3591 ext4_ext_store_pblock(&zero_ex,
3592 ext4_ext_pblock(ex));
3593 err = ext4_ext_zeroout(inode, &zero_ex);
3594 if (err)
3595 goto out;
3596 }
3597
Yongqiang Yang667eff32011-05-03 12:25:07 -04003598 split_map.m_lblk = ee_block;
Allison Henderson9b940f82011-05-16 10:11:09 -04003599 split_map.m_len = map->m_lblk - ee_block + map->m_len;
3600 allocated = map->m_len;
Amit Arora56055d32007-07-17 21:42:38 -04003601 }
3602 }
Yongqiang Yang667eff32011-05-03 12:25:07 -04003603
Theodore Ts'odfe50802014-09-01 14:37:09 -04003604 allocated = ext4_split_extent(handle, inode, ppath,
Lukas Czerner27dd4382013-04-09 22:11:22 -04003605 &split_map, split_flag, flags);
Yongqiang Yang667eff32011-05-03 12:25:07 -04003606 if (allocated < 0)
3607 err = allocated;
3608
Amit Arora56055d32007-07-17 21:42:38 -04003609out:
Zheng Liuadb23552013-03-10 21:13:05 -04003610 /* If we have gotten a failure, don't zero out status tree */
3611 if (!err)
Zheng Liud7b2a002013-08-28 14:47:06 -04003612 err = ext4_zeroout_es(inode, &zero_ex);
Amit Arora56055d32007-07-17 21:42:38 -04003613 return err ? err : allocated;
3614}
3615
Aneesh Kumar K.Vc278bfe2008-01-28 23:58:27 -05003616/*
Theodore Ts'oe35fd662010-05-16 19:00:00 -04003617 * This function is called by ext4_ext_map_blocks() from
Mingming Cao00314622009-09-28 15:49:08 -04003618 * ext4_get_blocks_dio_write() when DIO to write
Lukas Czerner556615d2014-04-20 23:45:47 -04003619 * to an unwritten extent.
Mingming Cao00314622009-09-28 15:49:08 -04003620 *
Lukas Czerner556615d2014-04-20 23:45:47 -04003621 * Writing to an unwritten extent may result in splitting the unwritten
3622 * extent into multiple initialized/unwritten extents (up to three)
Mingming Cao00314622009-09-28 15:49:08 -04003623 * There are three possibilities:
Lukas Czerner556615d2014-04-20 23:45:47 -04003624 * a> There is no split required: Entire extent should be unwritten
Mingming Cao00314622009-09-28 15:49:08 -04003625 * b> Splits in two extents: Write is happening at either end of the extent
3626 * c> Splits in three extents: Somone is writing in middle of the extent
3627 *
Lukas Czernerb8a86842014-03-18 18:05:35 -04003628 * This works the same way in the case of initialized -> unwritten conversion.
3629 *
Mingming Cao00314622009-09-28 15:49:08 -04003630 * One of more index blocks maybe needed if the extent tree grow after
Lukas Czerner556615d2014-04-20 23:45:47 -04003631 * the unwritten extent split. To prevent ENOSPC occur at the IO
3632 * complete, we need to split the unwritten extent before DIO submit
3633 * the IO. The unwritten extent called at this time will be split
3634 * into three unwritten extent(at most). After IO complete, the part
Mingming Cao00314622009-09-28 15:49:08 -04003635 * being filled will be convert to initialized by the end_io callback function
3636 * via ext4_convert_unwritten_extents().
Mingmingba230c32009-11-06 04:01:23 -05003637 *
Lukas Czerner556615d2014-04-20 23:45:47 -04003638 * Returns the size of unwritten extent to be written on success.
Mingming Cao00314622009-09-28 15:49:08 -04003639 */
Lukas Czernerb8a86842014-03-18 18:05:35 -04003640static int ext4_split_convert_extents(handle_t *handle,
Mingming Cao00314622009-09-28 15:49:08 -04003641 struct inode *inode,
Theodore Ts'oe35fd662010-05-16 19:00:00 -04003642 struct ext4_map_blocks *map,
Theodore Ts'odfe50802014-09-01 14:37:09 -04003643 struct ext4_ext_path **ppath,
Mingming Cao00314622009-09-28 15:49:08 -04003644 int flags)
3645{
Theodore Ts'odfe50802014-09-01 14:37:09 -04003646 struct ext4_ext_path *path = *ppath;
Yongqiang Yang667eff32011-05-03 12:25:07 -04003647 ext4_lblk_t eof_block;
3648 ext4_lblk_t ee_block;
3649 struct ext4_extent *ex;
3650 unsigned int ee_len;
3651 int split_flag = 0, depth;
Mingming Cao00314622009-09-28 15:49:08 -04003652
Lukas Czernerb8a86842014-03-18 18:05:35 -04003653 ext_debug("%s: inode %lu, logical block %llu, max_blocks %u\n",
3654 __func__, inode->i_ino,
3655 (unsigned long long)map->m_lblk, map->m_len);
Dmitry Monakhov21ca0872010-05-16 06:00:00 -04003656
3657 eof_block = (inode->i_size + inode->i_sb->s_blocksize - 1) >>
3658 inode->i_sb->s_blocksize_bits;
Theodore Ts'oe35fd662010-05-16 19:00:00 -04003659 if (eof_block < map->m_lblk + map->m_len)
3660 eof_block = map->m_lblk + map->m_len;
Mingming Cao00314622009-09-28 15:49:08 -04003661 /*
Dmitry Monakhov21ca0872010-05-16 06:00:00 -04003662 * It is safe to convert extent to initialized via explicit
3663 * zeroout only if extent is fully insde i_size or new_size.
3664 */
Yongqiang Yang667eff32011-05-03 12:25:07 -04003665 depth = ext_depth(inode);
3666 ex = path[depth].p_ext;
3667 ee_block = le32_to_cpu(ex->ee_block);
3668 ee_len = ext4_ext_get_actual_len(ex);
Dmitry Monakhov21ca0872010-05-16 06:00:00 -04003669
Lukas Czernerb8a86842014-03-18 18:05:35 -04003670 /* Convert to unwritten */
3671 if (flags & EXT4_GET_BLOCKS_CONVERT_UNWRITTEN) {
3672 split_flag |= EXT4_EXT_DATA_VALID1;
3673 /* Convert to initialized */
3674 } else if (flags & EXT4_GET_BLOCKS_CONVERT) {
3675 split_flag |= ee_block + ee_len <= eof_block ?
3676 EXT4_EXT_MAY_ZEROOUT : 0;
Lukas Czerner556615d2014-04-20 23:45:47 -04003677 split_flag |= (EXT4_EXT_MARK_UNWRIT2 | EXT4_EXT_DATA_VALID2);
Lukas Czernerb8a86842014-03-18 18:05:35 -04003678 }
Yongqiang Yang667eff32011-05-03 12:25:07 -04003679 flags |= EXT4_GET_BLOCKS_PRE_IO;
Theodore Ts'odfe50802014-09-01 14:37:09 -04003680 return ext4_split_extent(handle, inode, ppath, map, split_flag, flags);
Mingming Cao00314622009-09-28 15:49:08 -04003681}
Yongqiang Yang197217a2011-05-03 11:45:29 -04003682
Jiaying Zhangc7064ef2010-03-02 13:28:44 -05003683static int ext4_convert_unwritten_extents_endio(handle_t *handle,
Dmitry Monakhovdee1f972012-10-10 01:04:58 -04003684 struct inode *inode,
3685 struct ext4_map_blocks *map,
Theodore Ts'odfe50802014-09-01 14:37:09 -04003686 struct ext4_ext_path **ppath)
Mingming Cao00314622009-09-28 15:49:08 -04003687{
Theodore Ts'odfe50802014-09-01 14:37:09 -04003688 struct ext4_ext_path *path = *ppath;
Mingming Cao00314622009-09-28 15:49:08 -04003689 struct ext4_extent *ex;
Dmitry Monakhovdee1f972012-10-10 01:04:58 -04003690 ext4_lblk_t ee_block;
3691 unsigned int ee_len;
Mingming Cao00314622009-09-28 15:49:08 -04003692 int depth;
3693 int err = 0;
Mingming Cao00314622009-09-28 15:49:08 -04003694
3695 depth = ext_depth(inode);
Mingming Cao00314622009-09-28 15:49:08 -04003696 ex = path[depth].p_ext;
Dmitry Monakhovdee1f972012-10-10 01:04:58 -04003697 ee_block = le32_to_cpu(ex->ee_block);
3698 ee_len = ext4_ext_get_actual_len(ex);
Mingming Cao00314622009-09-28 15:49:08 -04003699
Yongqiang Yang197217a2011-05-03 11:45:29 -04003700 ext_debug("ext4_convert_unwritten_extents_endio: inode %lu, logical"
3701 "block %llu, max_blocks %u\n", inode->i_ino,
Dmitry Monakhovdee1f972012-10-10 01:04:58 -04003702 (unsigned long long)ee_block, ee_len);
3703
Dmitry Monakhovff95ec22013-03-04 00:41:05 -05003704 /* If extent is larger than requested it is a clear sign that we still
3705 * have some extent state machine issues left. So extent_split is still
3706 * required.
3707 * TODO: Once all related issues will be fixed this situation should be
3708 * illegal.
3709 */
Dmitry Monakhovdee1f972012-10-10 01:04:58 -04003710 if (ee_block != map->m_lblk || ee_len > map->m_len) {
Dmitry Monakhovff95ec22013-03-04 00:41:05 -05003711#ifdef EXT4_DEBUG
3712 ext4_warning("Inode (%ld) finished: extent logical block %llu,"
3713 " len %u; IO logical block %llu, len %u\n",
3714 inode->i_ino, (unsigned long long)ee_block, ee_len,
3715 (unsigned long long)map->m_lblk, map->m_len);
3716#endif
Theodore Ts'odfe50802014-09-01 14:37:09 -04003717 err = ext4_split_convert_extents(handle, inode, map, ppath,
Lukas Czernerb8a86842014-03-18 18:05:35 -04003718 EXT4_GET_BLOCKS_CONVERT);
Dmitry Monakhovdee1f972012-10-10 01:04:58 -04003719 if (err < 0)
Theodore Ts'odfe50802014-09-01 14:37:09 -04003720 return err;
Dmitry Monakhovdee1f972012-10-10 01:04:58 -04003721 ext4_ext_drop_refs(path);
Theodore Ts'odfe50802014-09-01 14:37:09 -04003722 path = ext4_ext_find_extent(inode, map->m_lblk, ppath, 0);
3723 if (IS_ERR(path))
3724 return PTR_ERR(path);
Dmitry Monakhovdee1f972012-10-10 01:04:58 -04003725 depth = ext_depth(inode);
3726 ex = path[depth].p_ext;
3727 }
Yongqiang Yang197217a2011-05-03 11:45:29 -04003728
Mingming Cao00314622009-09-28 15:49:08 -04003729 err = ext4_ext_get_access(handle, inode, path + depth);
3730 if (err)
3731 goto out;
3732 /* first mark the extent as initialized */
3733 ext4_ext_mark_initialized(ex);
3734
Yongqiang Yang197217a2011-05-03 11:45:29 -04003735 /* note: ext4_ext_correct_indexes() isn't needed here because
3736 * borders are not changed
Mingming Cao00314622009-09-28 15:49:08 -04003737 */
Theodore Ts'oecb94f52012-08-17 09:44:17 -04003738 ext4_ext_try_to_merge(handle, inode, path, ex);
Yongqiang Yang197217a2011-05-03 11:45:29 -04003739
Mingming Cao00314622009-09-28 15:49:08 -04003740 /* Mark modified extent as dirty */
Theodore Ts'oecb94f52012-08-17 09:44:17 -04003741 err = ext4_ext_dirty(handle, inode, path + path->p_depth);
Mingming Cao00314622009-09-28 15:49:08 -04003742out:
3743 ext4_ext_show_leaf(inode, path);
3744 return err;
3745}
3746
Aneesh Kumar K.V515f41c2009-12-29 23:39:06 -05003747static void unmap_underlying_metadata_blocks(struct block_device *bdev,
3748 sector_t block, int count)
3749{
3750 int i;
3751 for (i = 0; i < count; i++)
3752 unmap_underlying_metadata(bdev, block + i);
3753}
3754
Theodore Ts'o58590b02010-10-27 21:23:12 -04003755/*
3756 * Handle EOFBLOCKS_FL flag, clearing it if necessary
3757 */
3758static int check_eofblocks_fl(handle_t *handle, struct inode *inode,
Eric Sandeend002ebf2011-01-10 13:03:35 -05003759 ext4_lblk_t lblk,
Theodore Ts'o58590b02010-10-27 21:23:12 -04003760 struct ext4_ext_path *path,
3761 unsigned int len)
3762{
3763 int i, depth;
3764 struct ext4_extent_header *eh;
Sergey Senozhatsky65922cb2011-03-23 14:08:27 -04003765 struct ext4_extent *last_ex;
Theodore Ts'o58590b02010-10-27 21:23:12 -04003766
3767 if (!ext4_test_inode_flag(inode, EXT4_INODE_EOFBLOCKS))
3768 return 0;
3769
3770 depth = ext_depth(inode);
3771 eh = path[depth].p_hdr;
Theodore Ts'o58590b02010-10-27 21:23:12 -04003772
Lukas Czernerafcff5d2012-03-21 21:47:55 -04003773 /*
3774 * We're going to remove EOFBLOCKS_FL entirely in future so we
3775 * do not care for this case anymore. Simply remove the flag
3776 * if there are no extents.
3777 */
3778 if (unlikely(!eh->eh_entries))
3779 goto out;
Theodore Ts'o58590b02010-10-27 21:23:12 -04003780 last_ex = EXT_LAST_EXTENT(eh);
3781 /*
3782 * We should clear the EOFBLOCKS_FL flag if we are writing the
3783 * last block in the last extent in the file. We test this by
3784 * first checking to see if the caller to
3785 * ext4_ext_get_blocks() was interested in the last block (or
3786 * a block beyond the last block) in the current extent. If
3787 * this turns out to be false, we can bail out from this
3788 * function immediately.
3789 */
Eric Sandeend002ebf2011-01-10 13:03:35 -05003790 if (lblk + len < le32_to_cpu(last_ex->ee_block) +
Theodore Ts'o58590b02010-10-27 21:23:12 -04003791 ext4_ext_get_actual_len(last_ex))
3792 return 0;
3793 /*
3794 * If the caller does appear to be planning to write at or
3795 * beyond the end of the current extent, we then test to see
3796 * if the current extent is the last extent in the file, by
3797 * checking to make sure it was reached via the rightmost node
3798 * at each level of the tree.
3799 */
3800 for (i = depth-1; i >= 0; i--)
3801 if (path[i].p_idx != EXT_LAST_INDEX(path[i].p_hdr))
3802 return 0;
Lukas Czernerafcff5d2012-03-21 21:47:55 -04003803out:
Theodore Ts'o58590b02010-10-27 21:23:12 -04003804 ext4_clear_inode_flag(inode, EXT4_INODE_EOFBLOCKS);
3805 return ext4_mark_inode_dirty(handle, inode);
3806}
3807
Aditya Kali7b415bf2011-09-09 19:04:51 -04003808/**
3809 * ext4_find_delalloc_range: find delayed allocated block in the given range.
3810 *
Zheng Liu7d1b1fb2012-11-08 21:57:35 -05003811 * Return 1 if there is a delalloc block in the range, otherwise 0.
Aditya Kali7b415bf2011-09-09 19:04:51 -04003812 */
Zheng Liuf7fec032013-02-18 00:28:47 -05003813int ext4_find_delalloc_range(struct inode *inode,
3814 ext4_lblk_t lblk_start,
3815 ext4_lblk_t lblk_end)
Aditya Kali7b415bf2011-09-09 19:04:51 -04003816{
Zheng Liu7d1b1fb2012-11-08 21:57:35 -05003817 struct extent_status es;
Aditya Kali7b415bf2011-09-09 19:04:51 -04003818
Yan, Zhenge30b5dc2013-05-03 02:15:52 -04003819 ext4_es_find_delayed_extent_range(inode, lblk_start, lblk_end, &es);
Zheng Liu06b0c882013-02-18 00:26:51 -05003820 if (es.es_len == 0)
Zheng Liu7d1b1fb2012-11-08 21:57:35 -05003821 return 0; /* there is no delay extent in this tree */
Zheng Liu06b0c882013-02-18 00:26:51 -05003822 else if (es.es_lblk <= lblk_start &&
3823 lblk_start < es.es_lblk + es.es_len)
Zheng Liu7d1b1fb2012-11-08 21:57:35 -05003824 return 1;
Zheng Liu06b0c882013-02-18 00:26:51 -05003825 else if (lblk_start <= es.es_lblk && es.es_lblk <= lblk_end)
Zheng Liu7d1b1fb2012-11-08 21:57:35 -05003826 return 1;
Aditya Kali7b415bf2011-09-09 19:04:51 -04003827 else
Zheng Liu7d1b1fb2012-11-08 21:57:35 -05003828 return 0;
Aditya Kali7b415bf2011-09-09 19:04:51 -04003829}
3830
Zheng Liu7d1b1fb2012-11-08 21:57:35 -05003831int ext4_find_delalloc_cluster(struct inode *inode, ext4_lblk_t lblk)
Aditya Kali7b415bf2011-09-09 19:04:51 -04003832{
3833 struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
3834 ext4_lblk_t lblk_start, lblk_end;
Theodore Ts'of5a44db2013-12-20 09:29:35 -05003835 lblk_start = EXT4_LBLK_CMASK(sbi, lblk);
Aditya Kali7b415bf2011-09-09 19:04:51 -04003836 lblk_end = lblk_start + sbi->s_cluster_ratio - 1;
3837
Zheng Liu7d1b1fb2012-11-08 21:57:35 -05003838 return ext4_find_delalloc_range(inode, lblk_start, lblk_end);
Aditya Kali7b415bf2011-09-09 19:04:51 -04003839}
3840
3841/**
3842 * Determines how many complete clusters (out of those specified by the 'map')
3843 * are under delalloc and were reserved quota for.
3844 * This function is called when we are writing out the blocks that were
3845 * originally written with their allocation delayed, but then the space was
3846 * allocated using fallocate() before the delayed allocation could be resolved.
3847 * The cases to look for are:
3848 * ('=' indicated delayed allocated blocks
3849 * '-' indicates non-delayed allocated blocks)
3850 * (a) partial clusters towards beginning and/or end outside of allocated range
3851 * are not delalloc'ed.
3852 * Ex:
3853 * |----c---=|====c====|====c====|===-c----|
3854 * |++++++ allocated ++++++|
3855 * ==> 4 complete clusters in above example
3856 *
3857 * (b) partial cluster (outside of allocated range) towards either end is
3858 * marked for delayed allocation. In this case, we will exclude that
3859 * cluster.
3860 * Ex:
3861 * |----====c========|========c========|
3862 * |++++++ allocated ++++++|
3863 * ==> 1 complete clusters in above example
3864 *
3865 * Ex:
3866 * |================c================|
3867 * |++++++ allocated ++++++|
3868 * ==> 0 complete clusters in above example
3869 *
3870 * The ext4_da_update_reserve_space will be called only if we
3871 * determine here that there were some "entire" clusters that span
3872 * this 'allocated' range.
3873 * In the non-bigalloc case, this function will just end up returning num_blks
3874 * without ever calling ext4_find_delalloc_range.
3875 */
3876static unsigned int
3877get_reserved_cluster_alloc(struct inode *inode, ext4_lblk_t lblk_start,
3878 unsigned int num_blks)
3879{
3880 struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
3881 ext4_lblk_t alloc_cluster_start, alloc_cluster_end;
3882 ext4_lblk_t lblk_from, lblk_to, c_offset;
3883 unsigned int allocated_clusters = 0;
3884
3885 alloc_cluster_start = EXT4_B2C(sbi, lblk_start);
3886 alloc_cluster_end = EXT4_B2C(sbi, lblk_start + num_blks - 1);
3887
3888 /* max possible clusters for this allocation */
3889 allocated_clusters = alloc_cluster_end - alloc_cluster_start + 1;
3890
Aditya Kalid8990242011-09-09 19:18:51 -04003891 trace_ext4_get_reserved_cluster_alloc(inode, lblk_start, num_blks);
3892
Aditya Kali7b415bf2011-09-09 19:04:51 -04003893 /* Check towards left side */
Theodore Ts'of5a44db2013-12-20 09:29:35 -05003894 c_offset = EXT4_LBLK_COFF(sbi, lblk_start);
Aditya Kali7b415bf2011-09-09 19:04:51 -04003895 if (c_offset) {
Theodore Ts'of5a44db2013-12-20 09:29:35 -05003896 lblk_from = EXT4_LBLK_CMASK(sbi, lblk_start);
Aditya Kali7b415bf2011-09-09 19:04:51 -04003897 lblk_to = lblk_from + c_offset - 1;
3898
Zheng Liu7d1b1fb2012-11-08 21:57:35 -05003899 if (ext4_find_delalloc_range(inode, lblk_from, lblk_to))
Aditya Kali7b415bf2011-09-09 19:04:51 -04003900 allocated_clusters--;
3901 }
3902
3903 /* Now check towards right. */
Theodore Ts'of5a44db2013-12-20 09:29:35 -05003904 c_offset = EXT4_LBLK_COFF(sbi, lblk_start + num_blks);
Aditya Kali7b415bf2011-09-09 19:04:51 -04003905 if (allocated_clusters && c_offset) {
3906 lblk_from = lblk_start + num_blks;
3907 lblk_to = lblk_from + (sbi->s_cluster_ratio - c_offset) - 1;
3908
Zheng Liu7d1b1fb2012-11-08 21:57:35 -05003909 if (ext4_find_delalloc_range(inode, lblk_from, lblk_to))
Aditya Kali7b415bf2011-09-09 19:04:51 -04003910 allocated_clusters--;
3911 }
3912
3913 return allocated_clusters;
3914}
3915
Mingming Cao00314622009-09-28 15:49:08 -04003916static int
Theodore Ts'oe8b83d932014-09-01 14:35:09 -04003917convert_initialized_extent(handle_t *handle, struct inode *inode,
3918 struct ext4_map_blocks *map,
Theodore Ts'o4f224b82014-09-01 14:36:09 -04003919 struct ext4_ext_path **ppath, int flags,
Theodore Ts'oe8b83d932014-09-01 14:35:09 -04003920 unsigned int allocated, ext4_fsblk_t newblock)
Lukas Czernerb8a86842014-03-18 18:05:35 -04003921{
Theodore Ts'o4f224b82014-09-01 14:36:09 -04003922 struct ext4_ext_path *path = *ppath;
Theodore Ts'oe8b83d932014-09-01 14:35:09 -04003923 struct ext4_extent *ex;
3924 ext4_lblk_t ee_block;
3925 unsigned int ee_len;
3926 int depth;
Lukas Czernerb8a86842014-03-18 18:05:35 -04003927 int err = 0;
3928
3929 /*
3930 * Make sure that the extent is no bigger than we support with
Lukas Czerner556615d2014-04-20 23:45:47 -04003931 * unwritten extent
Lukas Czernerb8a86842014-03-18 18:05:35 -04003932 */
Lukas Czerner556615d2014-04-20 23:45:47 -04003933 if (map->m_len > EXT_UNWRITTEN_MAX_LEN)
3934 map->m_len = EXT_UNWRITTEN_MAX_LEN / 2;
Lukas Czernerb8a86842014-03-18 18:05:35 -04003935
Theodore Ts'oe8b83d932014-09-01 14:35:09 -04003936 depth = ext_depth(inode);
3937 ex = path[depth].p_ext;
3938 ee_block = le32_to_cpu(ex->ee_block);
3939 ee_len = ext4_ext_get_actual_len(ex);
3940
3941 ext_debug("%s: inode %lu, logical"
3942 "block %llu, max_blocks %u\n", __func__, inode->i_ino,
3943 (unsigned long long)ee_block, ee_len);
3944
3945 if (ee_block != map->m_lblk || ee_len > map->m_len) {
Theodore Ts'odfe50802014-09-01 14:37:09 -04003946 err = ext4_split_convert_extents(handle, inode, map, ppath,
Theodore Ts'oe8b83d932014-09-01 14:35:09 -04003947 EXT4_GET_BLOCKS_CONVERT_UNWRITTEN);
3948 if (err < 0)
3949 return err;
3950 ext4_ext_drop_refs(path);
Theodore Ts'o4f224b82014-09-01 14:36:09 -04003951 path = ext4_ext_find_extent(inode, map->m_lblk, ppath, 0);
Theodore Ts'oe8b83d932014-09-01 14:35:09 -04003952 if (IS_ERR(path))
3953 return PTR_ERR(path);
3954 depth = ext_depth(inode);
3955 ex = path[depth].p_ext;
3956 if (!ex) {
3957 EXT4_ERROR_INODE(inode, "unexpected hole at %lu",
3958 (unsigned long) map->m_lblk);
3959 return -EIO;
3960 }
3961 }
3962
3963 err = ext4_ext_get_access(handle, inode, path + depth);
3964 if (err)
3965 return err;
3966 /* first mark the extent as unwritten */
3967 ext4_ext_mark_unwritten(ex);
3968
3969 /* note: ext4_ext_correct_indexes() isn't needed here because
3970 * borders are not changed
3971 */
3972 ext4_ext_try_to_merge(handle, inode, path, ex);
3973
3974 /* Mark modified extent as dirty */
3975 err = ext4_ext_dirty(handle, inode, path + path->p_depth);
3976 if (err)
3977 return err;
3978 ext4_ext_show_leaf(inode, path);
3979
3980 ext4_update_inode_fsync_trans(handle, inode, 1);
3981 err = check_eofblocks_fl(handle, inode, map->m_lblk, path, map->m_len);
3982 if (err)
3983 return err;
Lukas Czernerb8a86842014-03-18 18:05:35 -04003984 map->m_flags |= EXT4_MAP_UNWRITTEN;
3985 if (allocated > map->m_len)
3986 allocated = map->m_len;
3987 map->m_len = allocated;
Theodore Ts'oe8b83d932014-09-01 14:35:09 -04003988 return allocated;
Lukas Czernerb8a86842014-03-18 18:05:35 -04003989}
3990
3991static int
Lukas Czerner556615d2014-04-20 23:45:47 -04003992ext4_ext_handle_unwritten_extents(handle_t *handle, struct inode *inode,
Theodore Ts'oe35fd662010-05-16 19:00:00 -04003993 struct ext4_map_blocks *map,
Theodore Ts'odfe50802014-09-01 14:37:09 -04003994 struct ext4_ext_path **ppath, int flags,
Theodore Ts'oe35fd662010-05-16 19:00:00 -04003995 unsigned int allocated, ext4_fsblk_t newblock)
Mingming Cao00314622009-09-28 15:49:08 -04003996{
Theodore Ts'odfe50802014-09-01 14:37:09 -04003997 struct ext4_ext_path *path = *ppath;
Mingming Cao00314622009-09-28 15:49:08 -04003998 int ret = 0;
3999 int err = 0;
Dmitry Monakhovf45ee3a2012-09-28 23:21:09 -04004000 ext4_io_end_t *io = ext4_inode_aio(inode);
Mingming Cao00314622009-09-28 15:49:08 -04004001
Lukas Czerner556615d2014-04-20 23:45:47 -04004002 ext_debug("ext4_ext_handle_unwritten_extents: inode %lu, logical "
Zheng Liu88635ca2011-12-28 19:00:25 -05004003 "block %llu, max_blocks %u, flags %x, allocated %u\n",
Theodore Ts'oe35fd662010-05-16 19:00:00 -04004004 inode->i_ino, (unsigned long long)map->m_lblk, map->m_len,
Mingming Cao00314622009-09-28 15:49:08 -04004005 flags, allocated);
4006 ext4_ext_show_leaf(inode, path);
4007
Lukas Czerner27dd4382013-04-09 22:11:22 -04004008 /*
Lukas Czerner556615d2014-04-20 23:45:47 -04004009 * When writing into unwritten space, we should not fail to
Lukas Czerner27dd4382013-04-09 22:11:22 -04004010 * allocate metadata blocks for the new extent block if needed.
4011 */
4012 flags |= EXT4_GET_BLOCKS_METADATA_NOFAIL;
4013
Lukas Czerner556615d2014-04-20 23:45:47 -04004014 trace_ext4_ext_handle_unwritten_extents(inode, map, flags,
Zheng Liub5645532012-11-08 14:33:43 -05004015 allocated, newblock);
Aditya Kalid8990242011-09-09 19:18:51 -04004016
Jiaying Zhangc7064ef2010-03-02 13:28:44 -05004017 /* get_block() before submit the IO, split the extent */
Lukas Czernerc8b459f2014-05-12 12:55:07 -04004018 if (flags & EXT4_GET_BLOCKS_PRE_IO) {
Theodore Ts'odfe50802014-09-01 14:37:09 -04004019 ret = ext4_split_convert_extents(handle, inode, map, ppath,
4020 flags | EXT4_GET_BLOCKS_CONVERT);
Dmitry Monakhov82e54222012-09-28 23:36:25 -04004021 if (ret <= 0)
4022 goto out;
Mingming5f524952009-11-10 10:48:04 -05004023 /*
4024 * Flag the inode(non aio case) or end_io struct (aio case)
Lucas De Marchi25985ed2011-03-30 22:57:33 -03004025 * that this IO needs to conversion to written when IO is
Mingming5f524952009-11-10 10:48:04 -05004026 * completed
4027 */
Tao Ma0edeb712011-10-31 17:30:44 -04004028 if (io)
4029 ext4_set_io_unwritten_flag(inode, io);
4030 else
Theodore Ts'o19f5fb72010-01-24 14:34:07 -05004031 ext4_set_inode_state(inode, EXT4_STATE_DIO_UNWRITTEN);
Zheng Liua25a4e12013-02-18 00:28:04 -05004032 map->m_flags |= EXT4_MAP_UNWRITTEN;
Mingming Cao00314622009-09-28 15:49:08 -04004033 goto out;
4034 }
Jiaying Zhangc7064ef2010-03-02 13:28:44 -05004035 /* IO end_io complete, convert the filled extent to written */
Lukas Czernerc8b459f2014-05-12 12:55:07 -04004036 if (flags & EXT4_GET_BLOCKS_CONVERT) {
Dmitry Monakhovdee1f972012-10-10 01:04:58 -04004037 ret = ext4_convert_unwritten_extents_endio(handle, inode, map,
Theodore Ts'odfe50802014-09-01 14:37:09 -04004038 ppath);
Theodore Ts'o58590b02010-10-27 21:23:12 -04004039 if (ret >= 0) {
Jan Karab436b9b2009-12-08 23:51:10 -05004040 ext4_update_inode_fsync_trans(handle, inode, 1);
Eric Sandeend002ebf2011-01-10 13:03:35 -05004041 err = check_eofblocks_fl(handle, inode, map->m_lblk,
4042 path, map->m_len);
Theodore Ts'o58590b02010-10-27 21:23:12 -04004043 } else
4044 err = ret;
Zheng Liucdee7842013-03-10 21:08:52 -04004045 map->m_flags |= EXT4_MAP_MAPPED;
Eric Whitney15cc1762014-02-12 10:42:45 -05004046 map->m_pblk = newblock;
Zheng Liucdee7842013-03-10 21:08:52 -04004047 if (allocated > map->m_len)
4048 allocated = map->m_len;
4049 map->m_len = allocated;
Mingming Cao00314622009-09-28 15:49:08 -04004050 goto out2;
4051 }
4052 /* buffered IO case */
4053 /*
4054 * repeat fallocate creation request
4055 * we already have an unwritten extent
4056 */
Lukas Czerner556615d2014-04-20 23:45:47 -04004057 if (flags & EXT4_GET_BLOCKS_UNWRIT_EXT) {
Zheng Liua25a4e12013-02-18 00:28:04 -05004058 map->m_flags |= EXT4_MAP_UNWRITTEN;
Mingming Cao00314622009-09-28 15:49:08 -04004059 goto map_out;
Zheng Liua25a4e12013-02-18 00:28:04 -05004060 }
Mingming Cao00314622009-09-28 15:49:08 -04004061
4062 /* buffered READ or buffered write_begin() lookup */
4063 if ((flags & EXT4_GET_BLOCKS_CREATE) == 0) {
4064 /*
4065 * We have blocks reserved already. We
4066 * return allocated blocks so that delalloc
4067 * won't do block reservation for us. But
4068 * the buffer head will be unmapped so that
4069 * a read from the block returns 0s.
4070 */
Theodore Ts'oe35fd662010-05-16 19:00:00 -04004071 map->m_flags |= EXT4_MAP_UNWRITTEN;
Mingming Cao00314622009-09-28 15:49:08 -04004072 goto out1;
4073 }
4074
4075 /* buffered write, writepage time, convert*/
Theodore Ts'odfe50802014-09-01 14:37:09 -04004076 ret = ext4_ext_convert_to_initialized(handle, inode, map, ppath, flags);
Dmitry Monakhova4e5d882011-10-25 08:15:12 -04004077 if (ret >= 0)
Jan Karab436b9b2009-12-08 23:51:10 -05004078 ext4_update_inode_fsync_trans(handle, inode, 1);
Mingming Cao00314622009-09-28 15:49:08 -04004079out:
4080 if (ret <= 0) {
4081 err = ret;
4082 goto out2;
4083 } else
4084 allocated = ret;
Theodore Ts'oe35fd662010-05-16 19:00:00 -04004085 map->m_flags |= EXT4_MAP_NEW;
Aneesh Kumar K.V515f41c2009-12-29 23:39:06 -05004086 /*
4087 * if we allocated more blocks than requested
4088 * we need to make sure we unmap the extra block
4089 * allocated. The actual needed block will get
4090 * unmapped later when we find the buffer_head marked
4091 * new.
4092 */
Theodore Ts'oe35fd662010-05-16 19:00:00 -04004093 if (allocated > map->m_len) {
Aneesh Kumar K.V515f41c2009-12-29 23:39:06 -05004094 unmap_underlying_metadata_blocks(inode->i_sb->s_bdev,
Theodore Ts'oe35fd662010-05-16 19:00:00 -04004095 newblock + map->m_len,
4096 allocated - map->m_len);
4097 allocated = map->m_len;
Aneesh Kumar K.V515f41c2009-12-29 23:39:06 -05004098 }
Zheng Liu3a225672013-03-10 21:20:23 -04004099 map->m_len = allocated;
Aneesh Kumar K.V5f634d02010-01-25 04:00:31 -05004100
4101 /*
4102 * If we have done fallocate with the offset that is already
4103 * delayed allocated, we would have block reservation
4104 * and quota reservation done in the delayed write path.
4105 * But fallocate would have already updated quota and block
4106 * count for this offset. So cancel these reservation
4107 */
Aditya Kali7b415bf2011-09-09 19:04:51 -04004108 if (flags & EXT4_GET_BLOCKS_DELALLOC_RESERVE) {
4109 unsigned int reserved_clusters;
4110 reserved_clusters = get_reserved_cluster_alloc(inode,
4111 map->m_lblk, map->m_len);
4112 if (reserved_clusters)
4113 ext4_da_update_reserve_space(inode,
4114 reserved_clusters,
4115 0);
4116 }
Aneesh Kumar K.V5f634d02010-01-25 04:00:31 -05004117
Mingming Cao00314622009-09-28 15:49:08 -04004118map_out:
Theodore Ts'oe35fd662010-05-16 19:00:00 -04004119 map->m_flags |= EXT4_MAP_MAPPED;
Dmitry Monakhova4e5d882011-10-25 08:15:12 -04004120 if ((flags & EXT4_GET_BLOCKS_KEEP_SIZE) == 0) {
4121 err = check_eofblocks_fl(handle, inode, map->m_lblk, path,
4122 map->m_len);
4123 if (err < 0)
4124 goto out2;
4125 }
Mingming Cao00314622009-09-28 15:49:08 -04004126out1:
Theodore Ts'oe35fd662010-05-16 19:00:00 -04004127 if (allocated > map->m_len)
4128 allocated = map->m_len;
Mingming Cao00314622009-09-28 15:49:08 -04004129 ext4_ext_show_leaf(inode, path);
Theodore Ts'oe35fd662010-05-16 19:00:00 -04004130 map->m_pblk = newblock;
4131 map->m_len = allocated;
Mingming Cao00314622009-09-28 15:49:08 -04004132out2:
Mingming Cao00314622009-09-28 15:49:08 -04004133 return err ? err : allocated;
4134}
Theodore Ts'o58590b02010-10-27 21:23:12 -04004135
Mingming Cao00314622009-09-28 15:49:08 -04004136/*
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004137 * get_implied_cluster_alloc - check to see if the requested
4138 * allocation (in the map structure) overlaps with a cluster already
4139 * allocated in an extent.
Aditya Kalid8990242011-09-09 19:18:51 -04004140 * @sb The filesystem superblock structure
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004141 * @map The requested lblk->pblk mapping
4142 * @ex The extent structure which might contain an implied
4143 * cluster allocation
4144 *
4145 * This function is called by ext4_ext_map_blocks() after we failed to
4146 * find blocks that were already in the inode's extent tree. Hence,
4147 * we know that the beginning of the requested region cannot overlap
4148 * the extent from the inode's extent tree. There are three cases we
4149 * want to catch. The first is this case:
4150 *
4151 * |--- cluster # N--|
4152 * |--- extent ---| |---- requested region ---|
4153 * |==========|
4154 *
4155 * The second case that we need to test for is this one:
4156 *
4157 * |--------- cluster # N ----------------|
4158 * |--- requested region --| |------- extent ----|
4159 * |=======================|
4160 *
4161 * The third case is when the requested region lies between two extents
4162 * within the same cluster:
4163 * |------------- cluster # N-------------|
4164 * |----- ex -----| |---- ex_right ----|
4165 * |------ requested region ------|
4166 * |================|
4167 *
4168 * In each of the above cases, we need to set the map->m_pblk and
4169 * map->m_len so it corresponds to the return the extent labelled as
4170 * "|====|" from cluster #N, since it is already in use for data in
4171 * cluster EXT4_B2C(sbi, map->m_lblk). We will then return 1 to
4172 * signal to ext4_ext_map_blocks() that map->m_pblk should be treated
4173 * as a new "allocated" block region. Otherwise, we will return 0 and
4174 * ext4_ext_map_blocks() will then allocate one or more new clusters
4175 * by calling ext4_mb_new_blocks().
4176 */
Aditya Kalid8990242011-09-09 19:18:51 -04004177static int get_implied_cluster_alloc(struct super_block *sb,
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004178 struct ext4_map_blocks *map,
4179 struct ext4_extent *ex,
4180 struct ext4_ext_path *path)
4181{
Aditya Kalid8990242011-09-09 19:18:51 -04004182 struct ext4_sb_info *sbi = EXT4_SB(sb);
Theodore Ts'of5a44db2013-12-20 09:29:35 -05004183 ext4_lblk_t c_offset = EXT4_LBLK_COFF(sbi, map->m_lblk);
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004184 ext4_lblk_t ex_cluster_start, ex_cluster_end;
Curt Wohlgemuth14d7f3e2011-12-18 17:39:02 -05004185 ext4_lblk_t rr_cluster_start;
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004186 ext4_lblk_t ee_block = le32_to_cpu(ex->ee_block);
4187 ext4_fsblk_t ee_start = ext4_ext_pblock(ex);
4188 unsigned short ee_len = ext4_ext_get_actual_len(ex);
4189
4190 /* The extent passed in that we are trying to match */
4191 ex_cluster_start = EXT4_B2C(sbi, ee_block);
4192 ex_cluster_end = EXT4_B2C(sbi, ee_block + ee_len - 1);
4193
4194 /* The requested region passed into ext4_map_blocks() */
4195 rr_cluster_start = EXT4_B2C(sbi, map->m_lblk);
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004196
4197 if ((rr_cluster_start == ex_cluster_end) ||
4198 (rr_cluster_start == ex_cluster_start)) {
4199 if (rr_cluster_start == ex_cluster_end)
4200 ee_start += ee_len - 1;
Theodore Ts'of5a44db2013-12-20 09:29:35 -05004201 map->m_pblk = EXT4_PBLK_CMASK(sbi, ee_start) + c_offset;
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004202 map->m_len = min(map->m_len,
4203 (unsigned) sbi->s_cluster_ratio - c_offset);
4204 /*
4205 * Check for and handle this case:
4206 *
4207 * |--------- cluster # N-------------|
4208 * |------- extent ----|
4209 * |--- requested region ---|
4210 * |===========|
4211 */
4212
4213 if (map->m_lblk < ee_block)
4214 map->m_len = min(map->m_len, ee_block - map->m_lblk);
4215
4216 /*
4217 * Check for the case where there is already another allocated
4218 * block to the right of 'ex' but before the end of the cluster.
4219 *
4220 * |------------- cluster # N-------------|
4221 * |----- ex -----| |---- ex_right ----|
4222 * |------ requested region ------|
4223 * |================|
4224 */
4225 if (map->m_lblk > ee_block) {
4226 ext4_lblk_t next = ext4_ext_next_allocated_block(path);
4227 map->m_len = min(map->m_len, next - map->m_lblk);
4228 }
Aditya Kalid8990242011-09-09 19:18:51 -04004229
4230 trace_ext4_get_implied_cluster_alloc_exit(sb, map, 1);
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004231 return 1;
4232 }
Aditya Kalid8990242011-09-09 19:18:51 -04004233
4234 trace_ext4_get_implied_cluster_alloc_exit(sb, map, 0);
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004235 return 0;
4236}
4237
4238
4239/*
Mingming Caof5ab0d12008-02-25 15:29:55 -05004240 * Block allocation/map/preallocation routine for extents based files
4241 *
4242 *
Aneesh Kumar K.Vc278bfe2008-01-28 23:58:27 -05004243 * Need to be called with
Aneesh Kumar K.V0e855ac2008-01-28 23:58:26 -05004244 * down_read(&EXT4_I(inode)->i_data_sem) if not allocating file system block
4245 * (ie, create is zero). Otherwise down_write(&EXT4_I(inode)->i_data_sem)
Mingming Caof5ab0d12008-02-25 15:29:55 -05004246 *
4247 * return > 0, number of of blocks already mapped/allocated
4248 * if create == 0 and these are pre-allocated blocks
4249 * buffer head is unmapped
4250 * otherwise blocks are mapped
4251 *
4252 * return = 0, if plain look up failed (blocks have not been allocated)
4253 * buffer head is unmapped
4254 *
4255 * return < 0, error case.
Aneesh Kumar K.Vc278bfe2008-01-28 23:58:27 -05004256 */
Theodore Ts'oe35fd662010-05-16 19:00:00 -04004257int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
4258 struct ext4_map_blocks *map, int flags)
Alex Tomasa86c6182006-10-11 01:21:03 -07004259{
4260 struct ext4_ext_path *path = NULL;
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004261 struct ext4_extent newex, *ex, *ex2;
4262 struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
Jiaying Zhang0562e0b2011-03-21 21:38:05 -04004263 ext4_fsblk_t newblock = 0;
Eric Whitneyce37c422014-02-19 18:52:39 -05004264 int free_on_err = 0, err = 0, depth, ret;
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004265 unsigned int allocated = 0, offset = 0;
Yongqiang Yang81fdbb42011-10-29 09:23:38 -04004266 unsigned int allocated_clusters = 0;
Alex Tomasc9de5602008-01-29 00:19:52 -05004267 struct ext4_allocation_request ar;
Dmitry Monakhovf45ee3a2012-09-28 23:21:09 -04004268 ext4_io_end_t *io = ext4_inode_aio(inode);
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004269 ext4_lblk_t cluster_offset;
Dmitry Monakhov82e54222012-09-28 23:36:25 -04004270 int set_unwritten = 0;
Alex Tomasa86c6182006-10-11 01:21:03 -07004271
Mingming84fe3be2009-09-01 08:44:37 -04004272 ext_debug("blocks %u/%u requested for inode %lu\n",
Theodore Ts'oe35fd662010-05-16 19:00:00 -04004273 map->m_lblk, map->m_len, inode->i_ino);
Jiaying Zhang0562e0b2011-03-21 21:38:05 -04004274 trace_ext4_ext_map_blocks_enter(inode, map->m_lblk, map->m_len, flags);
Alex Tomasa86c6182006-10-11 01:21:03 -07004275
Alex Tomasa86c6182006-10-11 01:21:03 -07004276 /* find extent for this block */
Theodore Ts'o107a7bd2013-08-16 21:23:41 -04004277 path = ext4_ext_find_extent(inode, map->m_lblk, NULL, 0);
Alex Tomasa86c6182006-10-11 01:21:03 -07004278 if (IS_ERR(path)) {
4279 err = PTR_ERR(path);
4280 path = NULL;
4281 goto out2;
4282 }
4283
4284 depth = ext_depth(inode);
4285
4286 /*
Randy Dunlapd0d856e2006-10-11 01:21:07 -07004287 * consistent leaf must not be empty;
4288 * this situation is possible, though, _during_ tree modification;
Alex Tomasa86c6182006-10-11 01:21:03 -07004289 * this is why assert can't be put in ext4_ext_find_extent()
4290 */
Frank Mayhar273df552010-03-02 11:46:09 -05004291 if (unlikely(path[depth].p_ext == NULL && depth != 0)) {
4292 EXT4_ERROR_INODE(inode, "bad extent address "
Theodore Ts'of70f3622010-05-16 23:00:00 -04004293 "lblock: %lu, depth: %d pblock %lld",
4294 (unsigned long) map->m_lblk, depth,
4295 path[depth].p_block);
Surbhi Palande034fb4c2009-12-14 09:53:52 -05004296 err = -EIO;
4297 goto out2;
4298 }
Alex Tomasa86c6182006-10-11 01:21:03 -07004299
Avantika Mathur7e028972006-12-06 20:41:33 -08004300 ex = path[depth].p_ext;
4301 if (ex) {
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05004302 ext4_lblk_t ee_block = le32_to_cpu(ex->ee_block);
Theodore Ts'obf89d162010-10-27 21:30:14 -04004303 ext4_fsblk_t ee_start = ext4_ext_pblock(ex);
Amit Aroraa2df2a62007-07-17 21:42:41 -04004304 unsigned short ee_len;
Suparna Bhattacharya471d4012006-10-11 01:21:06 -07004305
Lukas Czernerb8a86842014-03-18 18:05:35 -04004306
Suparna Bhattacharya471d4012006-10-11 01:21:06 -07004307 /*
Lukas Czerner556615d2014-04-20 23:45:47 -04004308 * unwritten extents are treated as holes, except that
Amit Arora56055d32007-07-17 21:42:38 -04004309 * we split out initialized portions during a write.
Suparna Bhattacharya471d4012006-10-11 01:21:06 -07004310 */
Amit Aroraa2df2a62007-07-17 21:42:41 -04004311 ee_len = ext4_ext_get_actual_len(ex);
Aditya Kalid8990242011-09-09 19:18:51 -04004312
4313 trace_ext4_ext_show_extent(inode, ee_block, ee_start, ee_len);
4314
Randy Dunlapd0d856e2006-10-11 01:21:07 -07004315 /* if found extent covers block, simply return it */
Theodore Ts'oe35fd662010-05-16 19:00:00 -04004316 if (in_range(map->m_lblk, ee_block, ee_len)) {
4317 newblock = map->m_lblk - ee_block + ee_start;
Randy Dunlapd0d856e2006-10-11 01:21:07 -07004318 /* number of remaining blocks in the extent */
Theodore Ts'oe35fd662010-05-16 19:00:00 -04004319 allocated = ee_len - (map->m_lblk - ee_block);
4320 ext_debug("%u fit into %u:%d -> %llu\n", map->m_lblk,
4321 ee_block, ee_len, newblock);
Amit Arora56055d32007-07-17 21:42:38 -04004322
Lukas Czernerb8a86842014-03-18 18:05:35 -04004323 /*
4324 * If the extent is initialized check whether the
4325 * caller wants to convert it to unwritten.
4326 */
Lukas Czerner556615d2014-04-20 23:45:47 -04004327 if ((!ext4_ext_is_unwritten(ex)) &&
Lukas Czernerb8a86842014-03-18 18:05:35 -04004328 (flags & EXT4_GET_BLOCKS_CONVERT_UNWRITTEN)) {
Theodore Ts'oe8b83d932014-09-01 14:35:09 -04004329 allocated = convert_initialized_extent(
Theodore Ts'o4f224b82014-09-01 14:36:09 -04004330 handle, inode, map, &path,
4331 flags, allocated, newblock);
Lukas Czernerb8a86842014-03-18 18:05:35 -04004332 goto out2;
Lukas Czerner556615d2014-04-20 23:45:47 -04004333 } else if (!ext4_ext_is_unwritten(ex))
Lukas Czerner78771912012-03-19 23:05:43 -04004334 goto out;
Zheng Liu69eb33d2013-02-18 00:31:07 -05004335
Lukas Czerner556615d2014-04-20 23:45:47 -04004336 ret = ext4_ext_handle_unwritten_extents(
Theodore Ts'odfe50802014-09-01 14:37:09 -04004337 handle, inode, map, &path, flags,
Lukas Czerner78771912012-03-19 23:05:43 -04004338 allocated, newblock);
Eric Whitneyce37c422014-02-19 18:52:39 -05004339 if (ret < 0)
4340 err = ret;
4341 else
4342 allocated = ret;
Eric Whitney31cf0f22014-03-13 23:14:46 -04004343 goto out2;
Alex Tomasa86c6182006-10-11 01:21:03 -07004344 }
4345 }
4346
Aditya Kali7b415bf2011-09-09 19:04:51 -04004347 if ((sbi->s_cluster_ratio > 1) &&
Zheng Liu7d1b1fb2012-11-08 21:57:35 -05004348 ext4_find_delalloc_cluster(inode, map->m_lblk))
Aditya Kali7b415bf2011-09-09 19:04:51 -04004349 map->m_flags |= EXT4_MAP_FROM_CLUSTER;
4350
Alex Tomasa86c6182006-10-11 01:21:03 -07004351 /*
Randy Dunlapd0d856e2006-10-11 01:21:07 -07004352 * requested block isn't allocated yet;
Alex Tomasa86c6182006-10-11 01:21:03 -07004353 * we couldn't try to create block if create flag is zero
4354 */
Theodore Ts'oc2177052009-05-14 00:58:52 -04004355 if ((flags & EXT4_GET_BLOCKS_CREATE) == 0) {
Amit Arora56055d32007-07-17 21:42:38 -04004356 /*
4357 * put just found gap into cache to speed up
4358 * subsequent requests
4359 */
Zheng Liud100eef2013-02-18 00:29:59 -05004360 if ((flags & EXT4_GET_BLOCKS_NO_PUT_HOLE) == 0)
4361 ext4_ext_put_gap_in_cache(inode, path, map->m_lblk);
Alex Tomasa86c6182006-10-11 01:21:03 -07004362 goto out2;
4363 }
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004364
Alex Tomasa86c6182006-10-11 01:21:03 -07004365 /*
Theodore Ts'oc2ea3fd2008-10-10 09:40:52 -04004366 * Okay, we need to do block allocation.
Andrew Morton63f57932006-10-11 01:21:24 -07004367 */
Aditya Kali7b415bf2011-09-09 19:04:51 -04004368 map->m_flags &= ~EXT4_MAP_FROM_CLUSTER;
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004369 newex.ee_block = cpu_to_le32(map->m_lblk);
Eric Whitneyd0abafa2014-01-06 14:00:23 -05004370 cluster_offset = EXT4_LBLK_COFF(sbi, map->m_lblk);
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004371
4372 /*
4373 * If we are doing bigalloc, check to see if the extent returned
4374 * by ext4_ext_find_extent() implies a cluster we can use.
4375 */
4376 if (cluster_offset && ex &&
Aditya Kalid8990242011-09-09 19:18:51 -04004377 get_implied_cluster_alloc(inode->i_sb, map, ex, path)) {
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004378 ar.len = allocated = map->m_len;
4379 newblock = map->m_pblk;
Aditya Kali7b415bf2011-09-09 19:04:51 -04004380 map->m_flags |= EXT4_MAP_FROM_CLUSTER;
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004381 goto got_allocated_blocks;
4382 }
Alex Tomasa86c6182006-10-11 01:21:03 -07004383
Alex Tomasc9de5602008-01-29 00:19:52 -05004384 /* find neighbour allocated blocks */
Theodore Ts'oe35fd662010-05-16 19:00:00 -04004385 ar.lleft = map->m_lblk;
Alex Tomasc9de5602008-01-29 00:19:52 -05004386 err = ext4_ext_search_left(inode, path, &ar.lleft, &ar.pleft);
4387 if (err)
4388 goto out2;
Theodore Ts'oe35fd662010-05-16 19:00:00 -04004389 ar.lright = map->m_lblk;
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004390 ex2 = NULL;
4391 err = ext4_ext_search_right(inode, path, &ar.lright, &ar.pright, &ex2);
Alex Tomasc9de5602008-01-29 00:19:52 -05004392 if (err)
4393 goto out2;
Amit Arora25d14f92007-05-24 13:04:13 -04004394
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004395 /* Check if the extent after searching to the right implies a
4396 * cluster we can use. */
4397 if ((sbi->s_cluster_ratio > 1) && ex2 &&
Aditya Kalid8990242011-09-09 19:18:51 -04004398 get_implied_cluster_alloc(inode->i_sb, map, ex2, path)) {
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004399 ar.len = allocated = map->m_len;
4400 newblock = map->m_pblk;
Aditya Kali7b415bf2011-09-09 19:04:51 -04004401 map->m_flags |= EXT4_MAP_FROM_CLUSTER;
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004402 goto got_allocated_blocks;
4403 }
4404
Amit Arora749269f2007-07-18 09:02:56 -04004405 /*
4406 * See if request is beyond maximum number of blocks we can have in
4407 * a single extent. For an initialized extent this limit is
Lukas Czerner556615d2014-04-20 23:45:47 -04004408 * EXT_INIT_MAX_LEN and for an unwritten extent this limit is
4409 * EXT_UNWRITTEN_MAX_LEN.
Amit Arora749269f2007-07-18 09:02:56 -04004410 */
Theodore Ts'oe35fd662010-05-16 19:00:00 -04004411 if (map->m_len > EXT_INIT_MAX_LEN &&
Lukas Czerner556615d2014-04-20 23:45:47 -04004412 !(flags & EXT4_GET_BLOCKS_UNWRIT_EXT))
Theodore Ts'oe35fd662010-05-16 19:00:00 -04004413 map->m_len = EXT_INIT_MAX_LEN;
Lukas Czerner556615d2014-04-20 23:45:47 -04004414 else if (map->m_len > EXT_UNWRITTEN_MAX_LEN &&
4415 (flags & EXT4_GET_BLOCKS_UNWRIT_EXT))
4416 map->m_len = EXT_UNWRITTEN_MAX_LEN;
Amit Arora749269f2007-07-18 09:02:56 -04004417
Theodore Ts'oe35fd662010-05-16 19:00:00 -04004418 /* Check if we can really insert (m_lblk)::(m_lblk + m_len) extent */
Theodore Ts'oe35fd662010-05-16 19:00:00 -04004419 newex.ee_len = cpu_to_le16(map->m_len);
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004420 err = ext4_ext_check_overlap(sbi, inode, &newex, path);
Amit Arora25d14f92007-05-24 13:04:13 -04004421 if (err)
Aneesh Kumar K.Vb939e372008-01-28 23:58:27 -05004422 allocated = ext4_ext_get_actual_len(&newex);
Amit Arora25d14f92007-05-24 13:04:13 -04004423 else
Theodore Ts'oe35fd662010-05-16 19:00:00 -04004424 allocated = map->m_len;
Alex Tomasc9de5602008-01-29 00:19:52 -05004425
4426 /* allocate new block */
4427 ar.inode = inode;
Theodore Ts'oe35fd662010-05-16 19:00:00 -04004428 ar.goal = ext4_ext_find_goal(inode, path, map->m_lblk);
4429 ar.logical = map->m_lblk;
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004430 /*
4431 * We calculate the offset from the beginning of the cluster
4432 * for the logical block number, since when we allocate a
4433 * physical cluster, the physical block should start at the
4434 * same offset from the beginning of the cluster. This is
4435 * needed so that future calls to get_implied_cluster_alloc()
4436 * work correctly.
4437 */
Theodore Ts'of5a44db2013-12-20 09:29:35 -05004438 offset = EXT4_LBLK_COFF(sbi, map->m_lblk);
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004439 ar.len = EXT4_NUM_B2C(sbi, offset+allocated);
4440 ar.goal -= offset;
4441 ar.logical -= offset;
Alex Tomasc9de5602008-01-29 00:19:52 -05004442 if (S_ISREG(inode->i_mode))
4443 ar.flags = EXT4_MB_HINT_DATA;
4444 else
4445 /* disable in-core preallocation for non-regular files */
4446 ar.flags = 0;
Vivek Haldar556b27a2011-05-25 07:41:54 -04004447 if (flags & EXT4_GET_BLOCKS_NO_NORMALIZE)
4448 ar.flags |= EXT4_MB_HINT_NOPREALLOC;
Alex Tomasc9de5602008-01-29 00:19:52 -05004449 newblock = ext4_mb_new_blocks(handle, &ar, &err);
Alex Tomasa86c6182006-10-11 01:21:03 -07004450 if (!newblock)
4451 goto out2;
Mingming84fe3be2009-09-01 08:44:37 -04004452 ext_debug("allocate new block: goal %llu, found %llu/%u\n",
Theodore Ts'o498e5f22008-11-05 00:14:04 -05004453 ar.goal, newblock, allocated);
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004454 free_on_err = 1;
Aditya Kali7b415bf2011-09-09 19:04:51 -04004455 allocated_clusters = ar.len;
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004456 ar.len = EXT4_C2B(sbi, ar.len) - offset;
4457 if (ar.len > allocated)
4458 ar.len = allocated;
Alex Tomasa86c6182006-10-11 01:21:03 -07004459
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004460got_allocated_blocks:
Alex Tomasa86c6182006-10-11 01:21:03 -07004461 /* try to insert new extent into found leaf and return */
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004462 ext4_ext_store_pblock(&newex, newblock + offset);
Alex Tomasc9de5602008-01-29 00:19:52 -05004463 newex.ee_len = cpu_to_le16(ar.len);
Lukas Czerner556615d2014-04-20 23:45:47 -04004464 /* Mark unwritten */
4465 if (flags & EXT4_GET_BLOCKS_UNWRIT_EXT){
4466 ext4_ext_mark_unwritten(&newex);
Zheng Liua25a4e12013-02-18 00:28:04 -05004467 map->m_flags |= EXT4_MAP_UNWRITTEN;
Mingming Cao8d5d02e2009-09-28 15:48:29 -04004468 /*
Jiaying Zhang744692d2010-03-04 16:14:02 -05004469 * io_end structure was created for every IO write to an
Lukas Czerner556615d2014-04-20 23:45:47 -04004470 * unwritten extent. To avoid unnecessary conversion,
Jiaying Zhang744692d2010-03-04 16:14:02 -05004471 * here we flag the IO that really needs the conversion.
Mingming5f524952009-11-10 10:48:04 -05004472 * For non asycn direct IO case, flag the inode state
Lucas De Marchi25985ed2011-03-30 22:57:33 -03004473 * that we need to perform conversion when IO is done.
Mingming Cao8d5d02e2009-09-28 15:48:29 -04004474 */
Lukas Czernerc8b459f2014-05-12 12:55:07 -04004475 if (flags & EXT4_GET_BLOCKS_PRE_IO)
Dmitry Monakhov82e54222012-09-28 23:36:25 -04004476 set_unwritten = 1;
Mingming Cao8d5d02e2009-09-28 15:48:29 -04004477 }
Jiaying Zhangc8d46e42010-02-24 09:52:53 -05004478
Dmitry Monakhova4e5d882011-10-25 08:15:12 -04004479 err = 0;
4480 if ((flags & EXT4_GET_BLOCKS_KEEP_SIZE) == 0)
4481 err = check_eofblocks_fl(handle, inode, map->m_lblk,
4482 path, ar.len);
Jiaying Zhang575a1d42011-07-10 20:07:25 -04004483 if (!err)
Theodore Ts'odfe50802014-09-01 14:37:09 -04004484 err = ext4_ext_insert_extent(handle, inode, &path,
Jiaying Zhang575a1d42011-07-10 20:07:25 -04004485 &newex, flags);
Dmitry Monakhov82e54222012-09-28 23:36:25 -04004486
4487 if (!err && set_unwritten) {
4488 if (io)
4489 ext4_set_io_unwritten_flag(inode, io);
4490 else
4491 ext4_set_inode_state(inode,
4492 EXT4_STATE_DIO_UNWRITTEN);
4493 }
4494
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004495 if (err && free_on_err) {
Maxim Patlasov7132de72011-07-10 19:37:48 -04004496 int fb_flags = flags & EXT4_GET_BLOCKS_DELALLOC_RESERVE ?
4497 EXT4_FREE_BLOCKS_NO_QUOT_UPDATE : 0;
Alex Tomas315054f2007-05-24 13:04:25 -04004498 /* free data blocks we just allocated */
Alex Tomasc9de5602008-01-29 00:19:52 -05004499 /* not a good idea to call discard here directly,
4500 * but otherwise we'd need to call it every free() */
Theodore Ts'oc2ea3fd2008-10-10 09:40:52 -04004501 ext4_discard_preallocations(inode);
Theodore Ts'oc8e15132013-07-15 00:09:37 -04004502 ext4_free_blocks(handle, inode, NULL, newblock,
4503 EXT4_C2B(sbi, allocated_clusters), fb_flags);
Alex Tomasa86c6182006-10-11 01:21:03 -07004504 goto out2;
Alex Tomas315054f2007-05-24 13:04:25 -04004505 }
Alex Tomasa86c6182006-10-11 01:21:03 -07004506
Alex Tomasa86c6182006-10-11 01:21:03 -07004507 /* previous routine could use block we allocated */
Theodore Ts'obf89d162010-10-27 21:30:14 -04004508 newblock = ext4_ext_pblock(&newex);
Aneesh Kumar K.Vb939e372008-01-28 23:58:27 -05004509 allocated = ext4_ext_get_actual_len(&newex);
Theodore Ts'oe35fd662010-05-16 19:00:00 -04004510 if (allocated > map->m_len)
4511 allocated = map->m_len;
4512 map->m_flags |= EXT4_MAP_NEW;
Alex Tomasa86c6182006-10-11 01:21:03 -07004513
Jan Karab436b9b2009-12-08 23:51:10 -05004514 /*
Aneesh Kumar K.V5f634d02010-01-25 04:00:31 -05004515 * Update reserved blocks/metadata blocks after successful
4516 * block allocation which had been deferred till now.
4517 */
Aditya Kali7b415bf2011-09-09 19:04:51 -04004518 if (flags & EXT4_GET_BLOCKS_DELALLOC_RESERVE) {
Yongqiang Yang81fdbb42011-10-29 09:23:38 -04004519 unsigned int reserved_clusters;
Aditya Kali7b415bf2011-09-09 19:04:51 -04004520 /*
Yongqiang Yang81fdbb42011-10-29 09:23:38 -04004521 * Check how many clusters we had reserved this allocated range
Aditya Kali7b415bf2011-09-09 19:04:51 -04004522 */
4523 reserved_clusters = get_reserved_cluster_alloc(inode,
4524 map->m_lblk, allocated);
4525 if (map->m_flags & EXT4_MAP_FROM_CLUSTER) {
4526 if (reserved_clusters) {
4527 /*
4528 * We have clusters reserved for this range.
4529 * But since we are not doing actual allocation
4530 * and are simply using blocks from previously
4531 * allocated cluster, we should release the
4532 * reservation and not claim quota.
4533 */
4534 ext4_da_update_reserve_space(inode,
4535 reserved_clusters, 0);
4536 }
4537 } else {
4538 BUG_ON(allocated_clusters < reserved_clusters);
Aditya Kali7b415bf2011-09-09 19:04:51 -04004539 if (reserved_clusters < allocated_clusters) {
Aditya Kali5356f262011-09-09 19:20:51 -04004540 struct ext4_inode_info *ei = EXT4_I(inode);
Aditya Kali7b415bf2011-09-09 19:04:51 -04004541 int reservation = allocated_clusters -
4542 reserved_clusters;
4543 /*
4544 * It seems we claimed few clusters outside of
4545 * the range of this allocation. We should give
4546 * it back to the reservation pool. This can
4547 * happen in the following case:
4548 *
4549 * * Suppose s_cluster_ratio is 4 (i.e., each
4550 * cluster has 4 blocks. Thus, the clusters
4551 * are [0-3],[4-7],[8-11]...
4552 * * First comes delayed allocation write for
4553 * logical blocks 10 & 11. Since there were no
4554 * previous delayed allocated blocks in the
4555 * range [8-11], we would reserve 1 cluster
4556 * for this write.
4557 * * Next comes write for logical blocks 3 to 8.
4558 * In this case, we will reserve 2 clusters
4559 * (for [0-3] and [4-7]; and not for [8-11] as
4560 * that range has a delayed allocated blocks.
4561 * Thus total reserved clusters now becomes 3.
4562 * * Now, during the delayed allocation writeout
4563 * time, we will first write blocks [3-8] and
4564 * allocate 3 clusters for writing these
4565 * blocks. Also, we would claim all these
4566 * three clusters above.
4567 * * Now when we come here to writeout the
4568 * blocks [10-11], we would expect to claim
4569 * the reservation of 1 cluster we had made
4570 * (and we would claim it since there are no
4571 * more delayed allocated blocks in the range
4572 * [8-11]. But our reserved cluster count had
4573 * already gone to 0.
4574 *
4575 * Thus, at the step 4 above when we determine
4576 * that there are still some unwritten delayed
4577 * allocated blocks outside of our current
4578 * block range, we should increment the
4579 * reserved clusters count so that when the
4580 * remaining blocks finally gets written, we
4581 * could claim them.
4582 */
Aditya Kali5356f262011-09-09 19:20:51 -04004583 dquot_reserve_block(inode,
4584 EXT4_C2B(sbi, reservation));
4585 spin_lock(&ei->i_block_reservation_lock);
4586 ei->i_reserved_data_blocks += reservation;
4587 spin_unlock(&ei->i_block_reservation_lock);
Aditya Kali7b415bf2011-09-09 19:04:51 -04004588 }
Lukas Czerner232ec872013-03-10 22:46:30 -04004589 /*
4590 * We will claim quota for all newly allocated blocks.
4591 * We're updating the reserved space *after* the
4592 * correction above so we do not accidentally free
4593 * all the metadata reservation because we might
4594 * actually need it later on.
4595 */
4596 ext4_da_update_reserve_space(inode, allocated_clusters,
4597 1);
Aditya Kali7b415bf2011-09-09 19:04:51 -04004598 }
4599 }
Aneesh Kumar K.V5f634d02010-01-25 04:00:31 -05004600
4601 /*
Jan Karab436b9b2009-12-08 23:51:10 -05004602 * Cache the extent and update transaction to commit on fdatasync only
Lukas Czerner556615d2014-04-20 23:45:47 -04004603 * when it is _not_ an unwritten extent.
Jan Karab436b9b2009-12-08 23:51:10 -05004604 */
Lukas Czerner556615d2014-04-20 23:45:47 -04004605 if ((flags & EXT4_GET_BLOCKS_UNWRIT_EXT) == 0)
Jan Karab436b9b2009-12-08 23:51:10 -05004606 ext4_update_inode_fsync_trans(handle, inode, 1);
Zheng Liu69eb33d2013-02-18 00:31:07 -05004607 else
Jan Karab436b9b2009-12-08 23:51:10 -05004608 ext4_update_inode_fsync_trans(handle, inode, 0);
Alex Tomasa86c6182006-10-11 01:21:03 -07004609out:
Theodore Ts'oe35fd662010-05-16 19:00:00 -04004610 if (allocated > map->m_len)
4611 allocated = map->m_len;
Alex Tomasa86c6182006-10-11 01:21:03 -07004612 ext4_ext_show_leaf(inode, path);
Theodore Ts'oe35fd662010-05-16 19:00:00 -04004613 map->m_flags |= EXT4_MAP_MAPPED;
4614 map->m_pblk = newblock;
4615 map->m_len = allocated;
Alex Tomasa86c6182006-10-11 01:21:03 -07004616out2:
4617 if (path) {
4618 ext4_ext_drop_refs(path);
4619 kfree(path);
4620 }
Allison Hendersone8613042011-05-25 07:41:46 -04004621
Theodore Ts'o63b99962013-07-16 10:28:47 -04004622 trace_ext4_ext_map_blocks_exit(inode, flags, map,
4623 err ? err : allocated);
4624 ext4_es_lru_add(inode);
Lukas Czerner78771912012-03-19 23:05:43 -04004625 return err ? err : allocated;
Alex Tomasa86c6182006-10-11 01:21:03 -07004626}
4627
Theodore Ts'o819c4922013-04-03 12:47:17 -04004628void ext4_ext_truncate(handle_t *handle, struct inode *inode)
Alex Tomasa86c6182006-10-11 01:21:03 -07004629{
Alex Tomasa86c6182006-10-11 01:21:03 -07004630 struct super_block *sb = inode->i_sb;
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05004631 ext4_lblk_t last_block;
Alex Tomasa86c6182006-10-11 01:21:03 -07004632 int err = 0;
4633
4634 /*
Randy Dunlapd0d856e2006-10-11 01:21:07 -07004635 * TODO: optimization is possible here.
4636 * Probably we need not scan at all,
4637 * because page truncation is enough.
Alex Tomasa86c6182006-10-11 01:21:03 -07004638 */
Alex Tomasa86c6182006-10-11 01:21:03 -07004639
4640 /* we have to know where to truncate from in crash case */
4641 EXT4_I(inode)->i_disksize = inode->i_size;
4642 ext4_mark_inode_dirty(handle, inode);
4643
4644 last_block = (inode->i_size + sb->s_blocksize - 1)
4645 >> EXT4_BLOCK_SIZE_BITS(sb);
Theodore Ts'o8acd5e92013-07-15 00:09:19 -04004646retry:
Zheng Liu51865fd2012-11-08 21:57:32 -05004647 err = ext4_es_remove_extent(inode, last_block,
4648 EXT_MAX_BLOCKS - last_block);
Theodore Ts'o94eec0f2013-07-29 12:12:56 -04004649 if (err == -ENOMEM) {
Theodore Ts'o8acd5e92013-07-15 00:09:19 -04004650 cond_resched();
4651 congestion_wait(BLK_RW_ASYNC, HZ/50);
4652 goto retry;
4653 }
4654 if (err) {
4655 ext4_std_error(inode->i_sb, err);
4656 return;
4657 }
Lukas Czerner5f95d212012-03-19 23:03:19 -04004658 err = ext4_ext_remove_space(inode, last_block, EXT_MAX_BLOCKS - 1);
Theodore Ts'o8acd5e92013-07-15 00:09:19 -04004659 ext4_std_error(inode->i_sb, err);
Alex Tomasa86c6182006-10-11 01:21:03 -07004660}
4661
Lukas Czerner0e8b6872014-03-18 18:03:51 -04004662static int ext4_alloc_file_blocks(struct file *file, ext4_lblk_t offset,
Dmitry Monakhovc174e6d2014-08-27 18:40:00 -04004663 ext4_lblk_t len, loff_t new_size,
4664 int flags, int mode)
Amit Aroraa2df2a62007-07-17 21:42:41 -04004665{
Al Viro496ad9a2013-01-23 17:07:38 -05004666 struct inode *inode = file_inode(file);
Amit Aroraa2df2a62007-07-17 21:42:41 -04004667 handle_t *handle;
Amit Aroraa2df2a62007-07-17 21:42:41 -04004668 int ret = 0;
4669 int ret2 = 0;
4670 int retries = 0;
Theodore Ts'o2ed88682010-05-16 20:00:00 -04004671 struct ext4_map_blocks map;
Lukas Czerner0e8b6872014-03-18 18:03:51 -04004672 unsigned int credits;
Dmitry Monakhovc174e6d2014-08-27 18:40:00 -04004673 loff_t epos;
Amit Aroraa2df2a62007-07-17 21:42:41 -04004674
Lukas Czerner0e8b6872014-03-18 18:03:51 -04004675 map.m_lblk = offset;
Dmitry Monakhovc174e6d2014-08-27 18:40:00 -04004676 map.m_len = len;
Greg Harm3c6fe772011-10-31 18:41:47 -04004677 /*
4678 * Don't normalize the request if it can fit in one extent so
4679 * that it doesn't get unnecessarily split into multiple
4680 * extents.
4681 */
Lukas Czerner556615d2014-04-20 23:45:47 -04004682 if (len <= EXT_UNWRITTEN_MAX_LEN)
Greg Harm3c6fe772011-10-31 18:41:47 -04004683 flags |= EXT4_GET_BLOCKS_NO_NORMALIZE;
Dmitry Monakhov60d46162012-10-05 11:32:02 -04004684
Lukas Czerner0e8b6872014-03-18 18:03:51 -04004685 /*
4686 * credits to insert 1 extent into extent tree
4687 */
4688 credits = ext4_chunk_trans_blocks(inode, len);
4689
Amit Aroraa2df2a62007-07-17 21:42:41 -04004690retry:
Dmitry Monakhovc174e6d2014-08-27 18:40:00 -04004691 while (ret >= 0 && len) {
Theodore Ts'o9924a922013-02-08 21:59:22 -05004692 handle = ext4_journal_start(inode, EXT4_HT_MAP_BLOCKS,
4693 credits);
Amit Aroraa2df2a62007-07-17 21:42:41 -04004694 if (IS_ERR(handle)) {
4695 ret = PTR_ERR(handle);
4696 break;
4697 }
Dmitry Monakhova4e5d882011-10-25 08:15:12 -04004698 ret = ext4_map_blocks(handle, inode, &map, flags);
Aneesh Kumar K.V221879c2008-01-28 23:58:27 -05004699 if (ret <= 0) {
Lukas Czernerf282ac12014-03-18 17:44:35 -04004700 ext4_debug("inode #%lu: block %u: len %u: "
4701 "ext4_ext_map_blocks returned %d",
4702 inode->i_ino, map.m_lblk,
4703 map.m_len, ret);
Amit Aroraa2df2a62007-07-17 21:42:41 -04004704 ext4_mark_inode_dirty(handle, inode);
4705 ret2 = ext4_journal_stop(handle);
4706 break;
4707 }
Dmitry Monakhovc174e6d2014-08-27 18:40:00 -04004708 map.m_lblk += ret;
4709 map.m_len = len = len - ret;
4710 epos = (loff_t)map.m_lblk << inode->i_blkbits;
4711 inode->i_ctime = ext4_current_time(inode);
4712 if (new_size) {
4713 if (epos > new_size)
4714 epos = new_size;
4715 if (ext4_update_inode_size(inode, epos) & 0x1)
4716 inode->i_mtime = inode->i_ctime;
4717 } else {
4718 if (epos > inode->i_size)
4719 ext4_set_inode_flag(inode,
4720 EXT4_INODE_EOFBLOCKS);
4721 }
4722 ext4_mark_inode_dirty(handle, inode);
Amit Aroraa2df2a62007-07-17 21:42:41 -04004723 ret2 = ext4_journal_stop(handle);
4724 if (ret2)
4725 break;
4726 }
Aneesh Kumar K.Vfd287842008-04-29 08:11:12 -04004727 if (ret == -ENOSPC &&
4728 ext4_should_retry_alloc(inode->i_sb, &retries)) {
4729 ret = 0;
Amit Aroraa2df2a62007-07-17 21:42:41 -04004730 goto retry;
Amit Aroraa2df2a62007-07-17 21:42:41 -04004731 }
Lukas Czernerf282ac12014-03-18 17:44:35 -04004732
Lukas Czerner0e8b6872014-03-18 18:03:51 -04004733 return ret > 0 ? ret2 : ret;
4734}
4735
Lukas Czernerb8a86842014-03-18 18:05:35 -04004736static long ext4_zero_range(struct file *file, loff_t offset,
4737 loff_t len, int mode)
4738{
4739 struct inode *inode = file_inode(file);
4740 handle_t *handle = NULL;
4741 unsigned int max_blocks;
4742 loff_t new_size = 0;
4743 int ret = 0;
4744 int flags;
Dmitry Monakhov69dc9532014-08-27 18:33:49 -04004745 int credits;
Dmitry Monakhovc174e6d2014-08-27 18:40:00 -04004746 int partial_begin, partial_end;
Lukas Czernerb8a86842014-03-18 18:05:35 -04004747 loff_t start, end;
4748 ext4_lblk_t lblk;
4749 struct address_space *mapping = inode->i_mapping;
4750 unsigned int blkbits = inode->i_blkbits;
4751
4752 trace_ext4_zero_range(inode, offset, len, mode);
4753
jon ernst6c5e73d2014-04-18 11:50:35 -04004754 if (!S_ISREG(inode->i_mode))
4755 return -EINVAL;
4756
Namjae Jeone1ee60f2014-05-27 12:48:55 -04004757 /* Call ext4_force_commit to flush all data in case of data=journal. */
4758 if (ext4_should_journal_data(inode)) {
4759 ret = ext4_force_commit(inode->i_sb);
4760 if (ret)
4761 return ret;
4762 }
4763
Lukas Czernerb8a86842014-03-18 18:05:35 -04004764 /*
4765 * Write out all dirty pages to avoid race conditions
4766 * Then release them.
4767 */
4768 if (mapping->nrpages && mapping_tagged(mapping, PAGECACHE_TAG_DIRTY)) {
4769 ret = filemap_write_and_wait_range(mapping, offset,
4770 offset + len - 1);
4771 if (ret)
4772 return ret;
4773 }
4774
4775 /*
4776 * Round up offset. This is not fallocate, we neet to zero out
4777 * blocks, so convert interior block aligned part of the range to
4778 * unwritten and possibly manually zero out unaligned parts of the
4779 * range.
4780 */
4781 start = round_up(offset, 1 << blkbits);
4782 end = round_down((offset + len), 1 << blkbits);
4783
4784 if (start < offset || end > offset + len)
4785 return -EINVAL;
Dmitry Monakhovc174e6d2014-08-27 18:40:00 -04004786 partial_begin = offset & ((1 << blkbits) - 1);
4787 partial_end = (offset + len) & ((1 << blkbits) - 1);
Lukas Czernerb8a86842014-03-18 18:05:35 -04004788
4789 lblk = start >> blkbits;
4790 max_blocks = (end >> blkbits);
4791 if (max_blocks < lblk)
4792 max_blocks = 0;
4793 else
4794 max_blocks -= lblk;
4795
Lukas Czerner556615d2014-04-20 23:45:47 -04004796 flags = EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT |
Theodore Ts'o713e8dd2014-09-01 14:32:09 -04004797 EXT4_GET_BLOCKS_CONVERT_UNWRITTEN |
4798 EXT4_EX_NOCACHE;
Lukas Czernerb8a86842014-03-18 18:05:35 -04004799 if (mode & FALLOC_FL_KEEP_SIZE)
4800 flags |= EXT4_GET_BLOCKS_KEEP_SIZE;
4801
4802 mutex_lock(&inode->i_mutex);
4803
4804 /*
4805 * Indirect files do not support unwritten extnets
4806 */
4807 if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) {
4808 ret = -EOPNOTSUPP;
4809 goto out_mutex;
4810 }
4811
4812 if (!(mode & FALLOC_FL_KEEP_SIZE) &&
4813 offset + len > i_size_read(inode)) {
4814 new_size = offset + len;
4815 ret = inode_newsize_ok(inode, new_size);
4816 if (ret)
4817 goto out_mutex;
4818 /*
4819 * If we have a partial block after EOF we have to allocate
4820 * the entire block.
4821 */
Dmitry Monakhovc174e6d2014-08-27 18:40:00 -04004822 if (partial_end)
Lukas Czernerb8a86842014-03-18 18:05:35 -04004823 max_blocks += 1;
4824 }
4825
4826 if (max_blocks > 0) {
4827
4828 /* Now release the pages and zero block aligned part of pages*/
4829 truncate_pagecache_range(inode, start, end - 1);
Dmitry Monakhovc174e6d2014-08-27 18:40:00 -04004830 inode->i_mtime = inode->i_ctime = ext4_current_time(inode);
Lukas Czernerb8a86842014-03-18 18:05:35 -04004831
4832 /* Wait all existing dio workers, newcomers will block on i_mutex */
4833 ext4_inode_block_unlocked_dio(inode);
4834 inode_dio_wait(inode);
4835
Dmitry Monakhovc174e6d2014-08-27 18:40:00 -04004836 ret = ext4_alloc_file_blocks(file, lblk, max_blocks, new_size,
4837 flags, mode);
Lukas Czernerb8a86842014-03-18 18:05:35 -04004838 if (ret)
4839 goto out_dio;
Theodore Ts'o713e8dd2014-09-01 14:32:09 -04004840 /*
4841 * Remove entire range from the extent status tree.
4842 *
4843 * ext4_es_remove_extent(inode, lblk, max_blocks) is
4844 * NOT sufficient. I'm not sure why this is the case,
4845 * but let's be conservative and remove the extent
4846 * status tree for the entire inode. There should be
4847 * no outstanding delalloc extents thanks to the
4848 * filemap_write_and_wait_range() call above.
4849 */
4850 ret = ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS);
4851 if (ret)
4852 goto out_dio;
Lukas Czernerb8a86842014-03-18 18:05:35 -04004853 }
Dmitry Monakhovc174e6d2014-08-27 18:40:00 -04004854 if (!partial_begin && !partial_end)
4855 goto out_dio;
4856
Dmitry Monakhov69dc9532014-08-27 18:33:49 -04004857 /*
4858 * In worst case we have to writeout two nonadjacent unwritten
4859 * blocks and update the inode
4860 */
4861 credits = (2 * ext4_ext_index_trans_blocks(inode, 2)) + 1;
4862 if (ext4_should_journal_data(inode))
4863 credits += 2;
4864 handle = ext4_journal_start(inode, EXT4_HT_MISC, credits);
Lukas Czernerb8a86842014-03-18 18:05:35 -04004865 if (IS_ERR(handle)) {
4866 ret = PTR_ERR(handle);
4867 ext4_std_error(inode->i_sb, ret);
4868 goto out_dio;
4869 }
4870
4871 inode->i_mtime = inode->i_ctime = ext4_current_time(inode);
Lukas Czernere5b30412014-04-01 00:59:21 -04004872 if (new_size) {
Dmitry Monakhov4631dbf2014-08-23 17:48:28 -04004873 ext4_update_inode_size(inode, new_size);
Lukas Czernere5b30412014-04-01 00:59:21 -04004874 } else {
Lukas Czernerb8a86842014-03-18 18:05:35 -04004875 /*
4876 * Mark that we allocate beyond EOF so the subsequent truncate
4877 * can proceed even if the new size is the same as i_size.
4878 */
4879 if ((offset + len) > i_size_read(inode))
4880 ext4_set_inode_flag(inode, EXT4_INODE_EOFBLOCKS);
4881 }
Lukas Czernerb8a86842014-03-18 18:05:35 -04004882 ext4_mark_inode_dirty(handle, inode);
4883
4884 /* Zero out partial block at the edges of the range */
4885 ret = ext4_zero_partial_blocks(handle, inode, offset, len);
4886
4887 if (file->f_flags & O_SYNC)
4888 ext4_handle_sync(handle);
4889
4890 ext4_journal_stop(handle);
4891out_dio:
4892 ext4_inode_resume_unlocked_dio(inode);
4893out_mutex:
4894 mutex_unlock(&inode->i_mutex);
4895 return ret;
4896}
4897
Lukas Czerner0e8b6872014-03-18 18:03:51 -04004898/*
4899 * preallocate space for a file. This implements ext4's fallocate file
4900 * operation, which gets called from sys_fallocate system call.
4901 * For block-mapped files, posix_fallocate should fall back to the method
4902 * of writing zeroes to the required new blocks (the same behavior which is
4903 * expected for file systems which do not support fallocate() system call).
4904 */
4905long ext4_fallocate(struct file *file, int mode, loff_t offset, loff_t len)
4906{
4907 struct inode *inode = file_inode(file);
Lukas Czerner0e8b6872014-03-18 18:03:51 -04004908 loff_t new_size = 0;
4909 unsigned int max_blocks;
4910 int ret = 0;
4911 int flags;
4912 ext4_lblk_t lblk;
Lukas Czerner0e8b6872014-03-18 18:03:51 -04004913 unsigned int blkbits = inode->i_blkbits;
4914
4915 /* Return error if mode is not supported */
4916 if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE |
Lukas Czernerb8a86842014-03-18 18:05:35 -04004917 FALLOC_FL_COLLAPSE_RANGE | FALLOC_FL_ZERO_RANGE))
Lukas Czerner0e8b6872014-03-18 18:03:51 -04004918 return -EOPNOTSUPP;
4919
4920 if (mode & FALLOC_FL_PUNCH_HOLE)
4921 return ext4_punch_hole(inode, offset, len);
4922
Lukas Czerner0e8b6872014-03-18 18:03:51 -04004923 ret = ext4_convert_inline_data(inode);
4924 if (ret)
4925 return ret;
4926
4927 /*
4928 * currently supporting (pre)allocate mode for extent-based
4929 * files _only_
4930 */
4931 if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)))
4932 return -EOPNOTSUPP;
4933
Theodore Ts'o40c406c2014-04-12 22:53:53 -04004934 if (mode & FALLOC_FL_COLLAPSE_RANGE)
4935 return ext4_collapse_range(inode, offset, len);
4936
Lukas Czernerb8a86842014-03-18 18:05:35 -04004937 if (mode & FALLOC_FL_ZERO_RANGE)
4938 return ext4_zero_range(file, offset, len, mode);
4939
Lukas Czerner0e8b6872014-03-18 18:03:51 -04004940 trace_ext4_fallocate_enter(inode, offset, len, mode);
4941 lblk = offset >> blkbits;
4942 /*
4943 * We can't just convert len to max_blocks because
4944 * If blocksize = 4096 offset = 3072 and len = 2048
4945 */
4946 max_blocks = (EXT4_BLOCK_ALIGN(len + offset, blkbits) >> blkbits)
4947 - lblk;
4948
Lukas Czerner556615d2014-04-20 23:45:47 -04004949 flags = EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT;
Lukas Czerner0e8b6872014-03-18 18:03:51 -04004950 if (mode & FALLOC_FL_KEEP_SIZE)
4951 flags |= EXT4_GET_BLOCKS_KEEP_SIZE;
4952
4953 mutex_lock(&inode->i_mutex);
4954
4955 if (!(mode & FALLOC_FL_KEEP_SIZE) &&
4956 offset + len > i_size_read(inode)) {
4957 new_size = offset + len;
4958 ret = inode_newsize_ok(inode, new_size);
4959 if (ret)
4960 goto out;
4961 }
4962
Dmitry Monakhovc174e6d2014-08-27 18:40:00 -04004963 ret = ext4_alloc_file_blocks(file, lblk, max_blocks, new_size,
4964 flags, mode);
Lukas Czerner0e8b6872014-03-18 18:03:51 -04004965 if (ret)
4966 goto out;
4967
Dmitry Monakhovc174e6d2014-08-27 18:40:00 -04004968 if (file->f_flags & O_SYNC && EXT4_SB(inode->i_sb)->s_journal) {
4969 ret = jbd2_complete_transaction(EXT4_SB(inode->i_sb)->s_journal,
4970 EXT4_I(inode)->i_sync_tid);
Lukas Czernerf282ac12014-03-18 17:44:35 -04004971 }
Lukas Czernerf282ac12014-03-18 17:44:35 -04004972out:
Aneesh Kumar K.V55bd7252008-02-15 12:47:21 -05004973 mutex_unlock(&inode->i_mutex);
Lukas Czerner0e8b6872014-03-18 18:03:51 -04004974 trace_ext4_fallocate_exit(inode, offset, max_blocks, ret);
4975 return ret;
Amit Aroraa2df2a62007-07-17 21:42:41 -04004976}
Eric Sandeen6873fa02008-10-07 00:46:36 -04004977
4978/*
Mingming Cao00314622009-09-28 15:49:08 -04004979 * This function convert a range of blocks to written extents
4980 * The caller of this function will pass the start offset and the size.
4981 * all unwritten extents within this range will be converted to
4982 * written extents.
4983 *
4984 * This function is called from the direct IO end io call back
4985 * function, to convert the fallocated extents after IO is completed.
Mingming109f5562009-11-10 10:48:08 -05004986 * Returns 0 on success.
Mingming Cao00314622009-09-28 15:49:08 -04004987 */
Jan Kara6b523df2013-06-04 13:21:11 -04004988int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode,
4989 loff_t offset, ssize_t len)
Mingming Cao00314622009-09-28 15:49:08 -04004990{
Mingming Cao00314622009-09-28 15:49:08 -04004991 unsigned int max_blocks;
4992 int ret = 0;
4993 int ret2 = 0;
Theodore Ts'o2ed88682010-05-16 20:00:00 -04004994 struct ext4_map_blocks map;
Mingming Cao00314622009-09-28 15:49:08 -04004995 unsigned int credits, blkbits = inode->i_blkbits;
4996
Theodore Ts'o2ed88682010-05-16 20:00:00 -04004997 map.m_lblk = offset >> blkbits;
Mingming Cao00314622009-09-28 15:49:08 -04004998 /*
4999 * We can't just convert len to max_blocks because
5000 * If blocksize = 4096 offset = 3072 and len = 2048
5001 */
Theodore Ts'o2ed88682010-05-16 20:00:00 -04005002 max_blocks = ((EXT4_BLOCK_ALIGN(len + offset, blkbits) >> blkbits) -
5003 map.m_lblk);
Mingming Cao00314622009-09-28 15:49:08 -04005004 /*
Jan Kara6b523df2013-06-04 13:21:11 -04005005 * This is somewhat ugly but the idea is clear: When transaction is
5006 * reserved, everything goes into it. Otherwise we rather start several
5007 * smaller transactions for conversion of each extent separately.
Mingming Cao00314622009-09-28 15:49:08 -04005008 */
Jan Kara6b523df2013-06-04 13:21:11 -04005009 if (handle) {
5010 handle = ext4_journal_start_reserved(handle,
5011 EXT4_HT_EXT_CONVERT);
5012 if (IS_ERR(handle))
5013 return PTR_ERR(handle);
5014 credits = 0;
5015 } else {
5016 /*
5017 * credits to insert 1 extent into extent tree
5018 */
5019 credits = ext4_chunk_trans_blocks(inode, max_blocks);
5020 }
Mingming Cao00314622009-09-28 15:49:08 -04005021 while (ret >= 0 && ret < max_blocks) {
Theodore Ts'o2ed88682010-05-16 20:00:00 -04005022 map.m_lblk += ret;
5023 map.m_len = (max_blocks -= ret);
Jan Kara6b523df2013-06-04 13:21:11 -04005024 if (credits) {
5025 handle = ext4_journal_start(inode, EXT4_HT_MAP_BLOCKS,
5026 credits);
5027 if (IS_ERR(handle)) {
5028 ret = PTR_ERR(handle);
5029 break;
5030 }
Mingming Cao00314622009-09-28 15:49:08 -04005031 }
Theodore Ts'o2ed88682010-05-16 20:00:00 -04005032 ret = ext4_map_blocks(handle, inode, &map,
Jiaying Zhangc7064ef2010-03-02 13:28:44 -05005033 EXT4_GET_BLOCKS_IO_CONVERT_EXT);
Lukas Czernerb06acd32013-01-28 21:21:12 -05005034 if (ret <= 0)
5035 ext4_warning(inode->i_sb,
5036 "inode #%lu: block %u: len %u: "
5037 "ext4_ext_map_blocks returned %d",
5038 inode->i_ino, map.m_lblk,
5039 map.m_len, ret);
Mingming Cao00314622009-09-28 15:49:08 -04005040 ext4_mark_inode_dirty(handle, inode);
Jan Kara6b523df2013-06-04 13:21:11 -04005041 if (credits)
5042 ret2 = ext4_journal_stop(handle);
5043 if (ret <= 0 || ret2)
Mingming Cao00314622009-09-28 15:49:08 -04005044 break;
5045 }
Jan Kara6b523df2013-06-04 13:21:11 -04005046 if (!credits)
5047 ret2 = ext4_journal_stop(handle);
Mingming Cao00314622009-09-28 15:49:08 -04005048 return ret > 0 ? ret2 : ret;
5049}
Yongqiang Yang6d9c85e2011-02-27 17:25:47 -05005050
Mingming Cao00314622009-09-28 15:49:08 -04005051/*
Zheng Liu69eb33d2013-02-18 00:31:07 -05005052 * If newes is not existing extent (newes->ec_pblk equals zero) find
5053 * delayed extent at start of newes and update newes accordingly and
Lukas Czerner91dd8c12012-11-28 12:32:26 -05005054 * return start of the next delayed extent.
5055 *
Zheng Liu69eb33d2013-02-18 00:31:07 -05005056 * If newes is existing extent (newes->ec_pblk is not equal zero)
Lukas Czerner91dd8c12012-11-28 12:32:26 -05005057 * return start of next delayed extent or EXT_MAX_BLOCKS if no delayed
Zheng Liu69eb33d2013-02-18 00:31:07 -05005058 * extent found. Leave newes unmodified.
Eric Sandeen6873fa02008-10-07 00:46:36 -04005059 */
Lukas Czerner91dd8c12012-11-28 12:32:26 -05005060static int ext4_find_delayed_extent(struct inode *inode,
Zheng Liu69eb33d2013-02-18 00:31:07 -05005061 struct extent_status *newes)
Eric Sandeen6873fa02008-10-07 00:46:36 -04005062{
Zheng Liub3aff3e2012-11-08 21:57:37 -05005063 struct extent_status es;
Zheng Liube401362013-02-18 00:27:26 -05005064 ext4_lblk_t block, next_del;
Eric Sandeen6873fa02008-10-07 00:46:36 -04005065
Zheng Liu69eb33d2013-02-18 00:31:07 -05005066 if (newes->es_pblk == 0) {
Yan, Zhenge30b5dc2013-05-03 02:15:52 -04005067 ext4_es_find_delayed_extent_range(inode, newes->es_lblk,
5068 newes->es_lblk + newes->es_len - 1, &es);
5069
Yongqiang Yang6d9c85e2011-02-27 17:25:47 -05005070 /*
Zheng Liu69eb33d2013-02-18 00:31:07 -05005071 * No extent in extent-tree contains block @newes->es_pblk,
Yongqiang Yang6d9c85e2011-02-27 17:25:47 -05005072 * then the block may stay in 1)a hole or 2)delayed-extent.
Yongqiang Yang6d9c85e2011-02-27 17:25:47 -05005073 */
Zheng Liu06b0c882013-02-18 00:26:51 -05005074 if (es.es_len == 0)
Zheng Liub3aff3e2012-11-08 21:57:37 -05005075 /* A hole found. */
Lukas Czerner91dd8c12012-11-28 12:32:26 -05005076 return 0;
Yongqiang Yang6d9c85e2011-02-27 17:25:47 -05005077
Zheng Liu69eb33d2013-02-18 00:31:07 -05005078 if (es.es_lblk > newes->es_lblk) {
Zheng Liub3aff3e2012-11-08 21:57:37 -05005079 /* A hole found. */
Zheng Liu69eb33d2013-02-18 00:31:07 -05005080 newes->es_len = min(es.es_lblk - newes->es_lblk,
5081 newes->es_len);
Lukas Czerner91dd8c12012-11-28 12:32:26 -05005082 return 0;
Eric Sandeen6873fa02008-10-07 00:46:36 -04005083 }
Yongqiang Yang6d9c85e2011-02-27 17:25:47 -05005084
Zheng Liu69eb33d2013-02-18 00:31:07 -05005085 newes->es_len = es.es_lblk + es.es_len - newes->es_lblk;
Eric Sandeen6873fa02008-10-07 00:46:36 -04005086 }
5087
Zheng Liu69eb33d2013-02-18 00:31:07 -05005088 block = newes->es_lblk + newes->es_len;
Yan, Zhenge30b5dc2013-05-03 02:15:52 -04005089 ext4_es_find_delayed_extent_range(inode, block, EXT_MAX_BLOCKS, &es);
Zheng Liube401362013-02-18 00:27:26 -05005090 if (es.es_len == 0)
5091 next_del = EXT_MAX_BLOCKS;
5092 else
5093 next_del = es.es_lblk;
5094
Lukas Czerner91dd8c12012-11-28 12:32:26 -05005095 return next_del;
Eric Sandeen6873fa02008-10-07 00:46:36 -04005096}
Eric Sandeen6873fa02008-10-07 00:46:36 -04005097/* fiemap flags we can handle specified here */
5098#define EXT4_FIEMAP_FLAGS (FIEMAP_FLAG_SYNC|FIEMAP_FLAG_XATTR)
5099
Aneesh Kumar K.V3a06d772008-11-22 15:04:59 -05005100static int ext4_xattr_fiemap(struct inode *inode,
5101 struct fiemap_extent_info *fieinfo)
Eric Sandeen6873fa02008-10-07 00:46:36 -04005102{
5103 __u64 physical = 0;
5104 __u64 length;
5105 __u32 flags = FIEMAP_EXTENT_LAST;
5106 int blockbits = inode->i_sb->s_blocksize_bits;
5107 int error = 0;
5108
5109 /* in-inode? */
Theodore Ts'o19f5fb72010-01-24 14:34:07 -05005110 if (ext4_test_inode_state(inode, EXT4_STATE_XATTR)) {
Eric Sandeen6873fa02008-10-07 00:46:36 -04005111 struct ext4_iloc iloc;
5112 int offset; /* offset of xattr in inode */
5113
5114 error = ext4_get_inode_loc(inode, &iloc);
5115 if (error)
5116 return error;
Jan Karaa60697f2013-05-31 19:38:56 -04005117 physical = (__u64)iloc.bh->b_blocknr << blockbits;
Eric Sandeen6873fa02008-10-07 00:46:36 -04005118 offset = EXT4_GOOD_OLD_INODE_SIZE +
5119 EXT4_I(inode)->i_extra_isize;
5120 physical += offset;
5121 length = EXT4_SB(inode->i_sb)->s_inode_size - offset;
5122 flags |= FIEMAP_EXTENT_DATA_INLINE;
Curt Wohlgemuthfd2dd9f2010-04-03 17:44:16 -04005123 brelse(iloc.bh);
Eric Sandeen6873fa02008-10-07 00:46:36 -04005124 } else { /* external block */
Jan Karaa60697f2013-05-31 19:38:56 -04005125 physical = (__u64)EXT4_I(inode)->i_file_acl << blockbits;
Eric Sandeen6873fa02008-10-07 00:46:36 -04005126 length = inode->i_sb->s_blocksize;
5127 }
5128
5129 if (physical)
5130 error = fiemap_fill_next_extent(fieinfo, 0, physical,
5131 length, flags);
5132 return (error < 0 ? error : 0);
5133}
5134
5135int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
5136 __u64 start, __u64 len)
5137{
5138 ext4_lblk_t start_blk;
Eric Sandeen6873fa02008-10-07 00:46:36 -04005139 int error = 0;
5140
Tao Ma94191982012-12-10 14:06:02 -05005141 if (ext4_has_inline_data(inode)) {
5142 int has_inline = 1;
5143
5144 error = ext4_inline_data_fiemap(inode, fieinfo, &has_inline);
5145
5146 if (has_inline)
5147 return error;
5148 }
5149
Theodore Ts'o7869a4a2013-08-16 22:05:14 -04005150 if (fieinfo->fi_flags & FIEMAP_FLAG_CACHE) {
5151 error = ext4_ext_precache(inode);
5152 if (error)
5153 return error;
5154 }
5155
Eric Sandeen6873fa02008-10-07 00:46:36 -04005156 /* fallback to generic here if not in extents fmt */
Dmitry Monakhov12e9b892010-05-16 22:00:00 -04005157 if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)))
Eric Sandeen6873fa02008-10-07 00:46:36 -04005158 return generic_block_fiemap(inode, fieinfo, start, len,
5159 ext4_get_block);
5160
5161 if (fiemap_check_flags(fieinfo, EXT4_FIEMAP_FLAGS))
5162 return -EBADR;
5163
5164 if (fieinfo->fi_flags & FIEMAP_FLAG_XATTR) {
5165 error = ext4_xattr_fiemap(inode, fieinfo);
5166 } else {
Leonard Michlmayraca92ff2010-03-04 17:07:28 -05005167 ext4_lblk_t len_blks;
5168 __u64 last_blk;
5169
Eric Sandeen6873fa02008-10-07 00:46:36 -04005170 start_blk = start >> inode->i_sb->s_blocksize_bits;
Leonard Michlmayraca92ff2010-03-04 17:07:28 -05005171 last_blk = (start + len - 1) >> inode->i_sb->s_blocksize_bits;
Lukas Czernerf17722f2011-06-06 00:05:17 -04005172 if (last_blk >= EXT_MAX_BLOCKS)
5173 last_blk = EXT_MAX_BLOCKS-1;
Leonard Michlmayraca92ff2010-03-04 17:07:28 -05005174 len_blks = ((ext4_lblk_t) last_blk) - start_blk + 1;
Eric Sandeen6873fa02008-10-07 00:46:36 -04005175
5176 /*
Lukas Czerner91dd8c12012-11-28 12:32:26 -05005177 * Walk the extent tree gathering extent information
5178 * and pushing extents back to the user.
Eric Sandeen6873fa02008-10-07 00:46:36 -04005179 */
Lukas Czerner91dd8c12012-11-28 12:32:26 -05005180 error = ext4_fill_fiemap_extents(inode, start_blk,
5181 len_blks, fieinfo);
Eric Sandeen6873fa02008-10-07 00:46:36 -04005182 }
Theodore Ts'o107a7bd2013-08-16 21:23:41 -04005183 ext4_es_lru_add(inode);
Eric Sandeen6873fa02008-10-07 00:46:36 -04005184 return error;
5185}
Namjae Jeon9eb79482014-02-23 15:18:59 -05005186
5187/*
5188 * ext4_access_path:
5189 * Function to access the path buffer for marking it dirty.
5190 * It also checks if there are sufficient credits left in the journal handle
5191 * to update path.
5192 */
5193static int
5194ext4_access_path(handle_t *handle, struct inode *inode,
5195 struct ext4_ext_path *path)
5196{
5197 int credits, err;
5198
5199 if (!ext4_handle_valid(handle))
5200 return 0;
5201
5202 /*
5203 * Check if need to extend journal credits
5204 * 3 for leaf, sb, and inode plus 2 (bmap and group
5205 * descriptor) for each block group; assume two block
5206 * groups
5207 */
5208 if (handle->h_buffer_credits < 7) {
5209 credits = ext4_writepage_trans_blocks(inode);
5210 err = ext4_ext_truncate_extend_restart(handle, inode, credits);
5211 /* EAGAIN is success */
5212 if (err && err != -EAGAIN)
5213 return err;
5214 }
5215
5216 err = ext4_ext_get_access(handle, inode, path);
5217 return err;
5218}
5219
5220/*
5221 * ext4_ext_shift_path_extents:
5222 * Shift the extents of a path structure lying between path[depth].p_ext
5223 * and EXT_LAST_EXTENT(path[depth].p_hdr) downwards, by subtracting shift
5224 * from starting block for each extent.
5225 */
5226static int
5227ext4_ext_shift_path_extents(struct ext4_ext_path *path, ext4_lblk_t shift,
5228 struct inode *inode, handle_t *handle,
5229 ext4_lblk_t *start)
5230{
5231 int depth, err = 0;
5232 struct ext4_extent *ex_start, *ex_last;
5233 bool update = 0;
5234 depth = path->p_depth;
5235
5236 while (depth >= 0) {
5237 if (depth == path->p_depth) {
5238 ex_start = path[depth].p_ext;
5239 if (!ex_start)
5240 return -EIO;
5241
5242 ex_last = EXT_LAST_EXTENT(path[depth].p_hdr);
5243 if (!ex_last)
5244 return -EIO;
5245
5246 err = ext4_access_path(handle, inode, path + depth);
5247 if (err)
5248 goto out;
5249
5250 if (ex_start == EXT_FIRST_EXTENT(path[depth].p_hdr))
5251 update = 1;
5252
Zheng Liu847c6c42014-04-12 12:45:55 -04005253 *start = le32_to_cpu(ex_last->ee_block) +
Namjae Jeon9eb79482014-02-23 15:18:59 -05005254 ext4_ext_get_actual_len(ex_last);
5255
5256 while (ex_start <= ex_last) {
Zheng Liu847c6c42014-04-12 12:45:55 -04005257 le32_add_cpu(&ex_start->ee_block, -shift);
Lukas Czerner6dd834e2014-04-18 10:55:24 -04005258 /* Try to merge to the left. */
5259 if ((ex_start >
5260 EXT_FIRST_EXTENT(path[depth].p_hdr)) &&
5261 ext4_ext_try_to_merge_right(inode,
5262 path, ex_start - 1))
5263 ex_last--;
5264 else
5265 ex_start++;
Namjae Jeon9eb79482014-02-23 15:18:59 -05005266 }
5267 err = ext4_ext_dirty(handle, inode, path + depth);
5268 if (err)
5269 goto out;
5270
5271 if (--depth < 0 || !update)
5272 break;
5273 }
5274
5275 /* Update index too */
5276 err = ext4_access_path(handle, inode, path + depth);
5277 if (err)
5278 goto out;
5279
Zheng Liu847c6c42014-04-12 12:45:55 -04005280 le32_add_cpu(&path[depth].p_idx->ei_block, -shift);
Namjae Jeon9eb79482014-02-23 15:18:59 -05005281 err = ext4_ext_dirty(handle, inode, path + depth);
5282 if (err)
5283 goto out;
5284
5285 /* we are done if current index is not a starting index */
5286 if (path[depth].p_idx != EXT_FIRST_INDEX(path[depth].p_hdr))
5287 break;
5288
5289 depth--;
5290 }
5291
5292out:
5293 return err;
5294}
5295
5296/*
5297 * ext4_ext_shift_extents:
5298 * All the extents which lies in the range from start to the last allocated
5299 * block for the file are shifted downwards by shift blocks.
5300 * On success, 0 is returned, error otherwise.
5301 */
5302static int
5303ext4_ext_shift_extents(struct inode *inode, handle_t *handle,
5304 ext4_lblk_t start, ext4_lblk_t shift)
5305{
5306 struct ext4_ext_path *path;
5307 int ret = 0, depth;
5308 struct ext4_extent *extent;
Dmitry Monakhovf8fb4f42014-08-30 23:50:56 -04005309 ext4_lblk_t stop_block;
Namjae Jeon9eb79482014-02-23 15:18:59 -05005310 ext4_lblk_t ex_start, ex_end;
5311
5312 /* Let path point to the last extent */
5313 path = ext4_ext_find_extent(inode, EXT_MAX_BLOCKS - 1, NULL, 0);
5314 if (IS_ERR(path))
5315 return PTR_ERR(path);
5316
5317 depth = path->p_depth;
5318 extent = path[depth].p_ext;
5319 if (!extent) {
5320 ext4_ext_drop_refs(path);
5321 kfree(path);
5322 return ret;
5323 }
5324
Zheng Liu847c6c42014-04-12 12:45:55 -04005325 stop_block = le32_to_cpu(extent->ee_block) +
5326 ext4_ext_get_actual_len(extent);
Namjae Jeon9eb79482014-02-23 15:18:59 -05005327 ext4_ext_drop_refs(path);
5328 kfree(path);
5329
5330 /* Nothing to shift, if hole is at the end of file */
5331 if (start >= stop_block)
5332 return ret;
5333
5334 /*
5335 * Don't start shifting extents until we make sure the hole is big
5336 * enough to accomodate the shift.
5337 */
5338 path = ext4_ext_find_extent(inode, start - 1, NULL, 0);
Dmitry Monakhov8dc79ec2014-04-13 15:05:42 -04005339 if (IS_ERR(path))
5340 return PTR_ERR(path);
Namjae Jeon9eb79482014-02-23 15:18:59 -05005341 depth = path->p_depth;
5342 extent = path[depth].p_ext;
Dmitry Monakhov8dc79ec2014-04-13 15:05:42 -04005343 if (extent) {
5344 ex_start = le32_to_cpu(extent->ee_block);
5345 ex_end = le32_to_cpu(extent->ee_block) +
Zheng Liu847c6c42014-04-12 12:45:55 -04005346 ext4_ext_get_actual_len(extent);
Dmitry Monakhov8dc79ec2014-04-13 15:05:42 -04005347 } else {
5348 ex_start = 0;
5349 ex_end = 0;
5350 }
Namjae Jeon9eb79482014-02-23 15:18:59 -05005351 ext4_ext_drop_refs(path);
5352 kfree(path);
5353
5354 if ((start == ex_start && shift > ex_start) ||
5355 (shift > start - ex_end))
5356 return -EINVAL;
5357
5358 /* Its safe to start updating extents */
5359 while (start < stop_block) {
5360 path = ext4_ext_find_extent(inode, start, NULL, 0);
5361 if (IS_ERR(path))
5362 return PTR_ERR(path);
5363 depth = path->p_depth;
5364 extent = path[depth].p_ext;
Dmitry Monakhova18ed352014-04-13 15:41:13 -04005365 if (!extent) {
5366 EXT4_ERROR_INODE(inode, "unexpected hole at %lu",
5367 (unsigned long) start);
5368 return -EIO;
5369 }
Dmitry Monakhovf8fb4f42014-08-30 23:50:56 -04005370 if (start > le32_to_cpu(extent->ee_block)) {
Namjae Jeon9eb79482014-02-23 15:18:59 -05005371 /* Hole, move to the next extent */
Dmitry Monakhovf8fb4f42014-08-30 23:50:56 -04005372 if (extent < EXT_LAST_EXTENT(path[depth].p_hdr)) {
5373 path[depth].p_ext++;
5374 } else {
5375 start = ext4_ext_next_allocated_block(path);
Namjae Jeon9eb79482014-02-23 15:18:59 -05005376 ext4_ext_drop_refs(path);
5377 kfree(path);
Dmitry Monakhovf8fb4f42014-08-30 23:50:56 -04005378 continue;
Namjae Jeon9eb79482014-02-23 15:18:59 -05005379 }
5380 }
5381 ret = ext4_ext_shift_path_extents(path, shift, inode,
5382 handle, &start);
5383 ext4_ext_drop_refs(path);
5384 kfree(path);
5385 if (ret)
5386 break;
5387 }
5388
5389 return ret;
5390}
5391
5392/*
5393 * ext4_collapse_range:
5394 * This implements the fallocate's collapse range functionality for ext4
5395 * Returns: 0 and non-zero on error.
5396 */
5397int ext4_collapse_range(struct inode *inode, loff_t offset, loff_t len)
5398{
5399 struct super_block *sb = inode->i_sb;
5400 ext4_lblk_t punch_start, punch_stop;
5401 handle_t *handle;
5402 unsigned int credits;
Namjae Jeona8680e02014-04-19 16:37:31 -04005403 loff_t new_size, ioffset;
Namjae Jeon9eb79482014-02-23 15:18:59 -05005404 int ret;
5405
Namjae Jeon9eb79482014-02-23 15:18:59 -05005406 /* Collapse range works only on fs block size aligned offsets. */
Namjae Jeonee98fa32014-07-29 10:45:31 -04005407 if (offset & (EXT4_CLUSTER_SIZE(sb) - 1) ||
5408 len & (EXT4_CLUSTER_SIZE(sb) - 1))
Namjae Jeon9eb79482014-02-23 15:18:59 -05005409 return -EINVAL;
5410
5411 if (!S_ISREG(inode->i_mode))
Theodore Ts'o86f1ca32014-04-18 11:52:11 -04005412 return -EINVAL;
Namjae Jeon9eb79482014-02-23 15:18:59 -05005413
5414 trace_ext4_collapse_range(inode, offset, len);
5415
5416 punch_start = offset >> EXT4_BLOCK_SIZE_BITS(sb);
5417 punch_stop = (offset + len) >> EXT4_BLOCK_SIZE_BITS(sb);
5418
Namjae Jeon1ce01c42014-04-10 22:58:20 -04005419 /* Call ext4_force_commit to flush all data in case of data=journal. */
5420 if (ext4_should_journal_data(inode)) {
5421 ret = ext4_force_commit(inode->i_sb);
5422 if (ret)
5423 return ret;
5424 }
5425
Namjae Jeona8680e02014-04-19 16:37:31 -04005426 /*
5427 * Need to round down offset to be aligned with page size boundary
5428 * for page size > block size.
5429 */
5430 ioffset = round_down(offset, PAGE_SIZE);
5431
Namjae Jeon9eb79482014-02-23 15:18:59 -05005432 /* Write out all dirty pages */
Namjae Jeona8680e02014-04-19 16:37:31 -04005433 ret = filemap_write_and_wait_range(inode->i_mapping, ioffset,
5434 LLONG_MAX);
Namjae Jeon9eb79482014-02-23 15:18:59 -05005435 if (ret)
5436 return ret;
5437
5438 /* Take mutex lock */
5439 mutex_lock(&inode->i_mutex);
5440
Lukas Czerner23fffa92014-04-12 09:56:41 -04005441 /*
5442 * There is no need to overlap collapse range with EOF, in which case
5443 * it is effectively a truncate operation
5444 */
5445 if (offset + len >= i_size_read(inode)) {
5446 ret = -EINVAL;
5447 goto out_mutex;
5448 }
5449
Namjae Jeon9eb79482014-02-23 15:18:59 -05005450 /* Currently just for extent based files */
5451 if (!ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)) {
5452 ret = -EOPNOTSUPP;
5453 goto out_mutex;
5454 }
5455
Namjae Jeona8680e02014-04-19 16:37:31 -04005456 truncate_pagecache(inode, ioffset);
Namjae Jeon9eb79482014-02-23 15:18:59 -05005457
5458 /* Wait for existing dio to complete */
5459 ext4_inode_block_unlocked_dio(inode);
5460 inode_dio_wait(inode);
5461
5462 credits = ext4_writepage_trans_blocks(inode);
5463 handle = ext4_journal_start(inode, EXT4_HT_TRUNCATE, credits);
5464 if (IS_ERR(handle)) {
5465 ret = PTR_ERR(handle);
5466 goto out_dio;
5467 }
5468
5469 down_write(&EXT4_I(inode)->i_data_sem);
5470 ext4_discard_preallocations(inode);
5471
5472 ret = ext4_es_remove_extent(inode, punch_start,
Lukas Czerner2c1d2322014-04-18 10:43:21 -04005473 EXT_MAX_BLOCKS - punch_start);
Namjae Jeon9eb79482014-02-23 15:18:59 -05005474 if (ret) {
5475 up_write(&EXT4_I(inode)->i_data_sem);
5476 goto out_stop;
5477 }
5478
5479 ret = ext4_ext_remove_space(inode, punch_start, punch_stop - 1);
5480 if (ret) {
5481 up_write(&EXT4_I(inode)->i_data_sem);
5482 goto out_stop;
5483 }
Lukas Czerneref24f6c2014-04-18 10:50:23 -04005484 ext4_discard_preallocations(inode);
Namjae Jeon9eb79482014-02-23 15:18:59 -05005485
5486 ret = ext4_ext_shift_extents(inode, handle, punch_stop,
5487 punch_stop - punch_start);
5488 if (ret) {
5489 up_write(&EXT4_I(inode)->i_data_sem);
5490 goto out_stop;
5491 }
5492
5493 new_size = i_size_read(inode) - len;
Lukas Czerner9337d5d2014-04-18 10:48:25 -04005494 i_size_write(inode, new_size);
Namjae Jeon9eb79482014-02-23 15:18:59 -05005495 EXT4_I(inode)->i_disksize = new_size;
5496
Namjae Jeon9eb79482014-02-23 15:18:59 -05005497 up_write(&EXT4_I(inode)->i_data_sem);
5498 if (IS_SYNC(inode))
5499 ext4_handle_sync(handle);
5500 inode->i_mtime = inode->i_ctime = ext4_current_time(inode);
5501 ext4_mark_inode_dirty(handle, inode);
5502
5503out_stop:
5504 ext4_journal_stop(handle);
5505out_dio:
5506 ext4_inode_resume_unlocked_dio(inode);
5507out_mutex:
5508 mutex_unlock(&inode->i_mutex);
5509 return ret;
5510}
Dmitry Monakhovfcf6b1b72014-08-30 23:52:19 -04005511
5512/**
5513 * ext4_swap_extents - Swap extents between two inodes
5514 *
5515 * @inode1: First inode
5516 * @inode2: Second inode
5517 * @lblk1: Start block for first inode
5518 * @lblk2: Start block for second inode
5519 * @count: Number of blocks to swap
5520 * @mark_unwritten: Mark second inode's extents as unwritten after swap
5521 * @erp: Pointer to save error value
5522 *
5523 * This helper routine does exactly what is promise "swap extents". All other
5524 * stuff such as page-cache locking consistency, bh mapping consistency or
5525 * extent's data copying must be performed by caller.
5526 * Locking:
5527 * i_mutex is held for both inodes
5528 * i_data_sem is locked for write for both inodes
5529 * Assumptions:
5530 * All pages from requested range are locked for both inodes
5531 */
5532int
5533ext4_swap_extents(handle_t *handle, struct inode *inode1,
5534 struct inode *inode2, ext4_lblk_t lblk1, ext4_lblk_t lblk2,
5535 ext4_lblk_t count, int unwritten, int *erp)
5536{
5537 struct ext4_ext_path *path1 = NULL;
5538 struct ext4_ext_path *path2 = NULL;
5539 int replaced_count = 0;
5540
5541 BUG_ON(!rwsem_is_locked(&EXT4_I(inode1)->i_data_sem));
5542 BUG_ON(!rwsem_is_locked(&EXT4_I(inode2)->i_data_sem));
5543 BUG_ON(!mutex_is_locked(&inode1->i_mutex));
5544 BUG_ON(!mutex_is_locked(&inode1->i_mutex));
5545
5546 *erp = ext4_es_remove_extent(inode1, lblk1, count);
Theodore Ts'o19008f62014-08-31 15:03:14 -04005547 if (unlikely(*erp))
Dmitry Monakhovfcf6b1b72014-08-30 23:52:19 -04005548 return 0;
5549 *erp = ext4_es_remove_extent(inode2, lblk2, count);
Theodore Ts'o19008f62014-08-31 15:03:14 -04005550 if (unlikely(*erp))
Dmitry Monakhovfcf6b1b72014-08-30 23:52:19 -04005551 return 0;
5552
5553 while (count) {
5554 struct ext4_extent *ex1, *ex2, tmp_ex;
5555 ext4_lblk_t e1_blk, e2_blk;
5556 int e1_len, e2_len, len;
5557 int split = 0;
5558
5559 path1 = ext4_ext_find_extent(inode1, lblk1, NULL, EXT4_EX_NOCACHE);
Theodore Ts'o19008f62014-08-31 15:03:14 -04005560 if (unlikely(IS_ERR(path1))) {
Dmitry Monakhovfcf6b1b72014-08-30 23:52:19 -04005561 *erp = PTR_ERR(path1);
Theodore Ts'o19008f62014-08-31 15:03:14 -04005562 path1 = NULL;
5563 finish:
5564 count = 0;
5565 goto repeat;
Dmitry Monakhovfcf6b1b72014-08-30 23:52:19 -04005566 }
5567 path2 = ext4_ext_find_extent(inode2, lblk2, NULL, EXT4_EX_NOCACHE);
Theodore Ts'o19008f62014-08-31 15:03:14 -04005568 if (unlikely(IS_ERR(path2))) {
Dmitry Monakhovfcf6b1b72014-08-30 23:52:19 -04005569 *erp = PTR_ERR(path2);
Theodore Ts'o19008f62014-08-31 15:03:14 -04005570 path2 = NULL;
5571 goto finish;
Dmitry Monakhovfcf6b1b72014-08-30 23:52:19 -04005572 }
5573 ex1 = path1[path1->p_depth].p_ext;
5574 ex2 = path2[path2->p_depth].p_ext;
5575 /* Do we have somthing to swap ? */
5576 if (unlikely(!ex2 || !ex1))
Theodore Ts'o19008f62014-08-31 15:03:14 -04005577 goto finish;
Dmitry Monakhovfcf6b1b72014-08-30 23:52:19 -04005578
5579 e1_blk = le32_to_cpu(ex1->ee_block);
5580 e2_blk = le32_to_cpu(ex2->ee_block);
5581 e1_len = ext4_ext_get_actual_len(ex1);
5582 e2_len = ext4_ext_get_actual_len(ex2);
5583
5584 /* Hole handling */
5585 if (!in_range(lblk1, e1_blk, e1_len) ||
5586 !in_range(lblk2, e2_blk, e2_len)) {
5587 ext4_lblk_t next1, next2;
5588
5589 /* if hole after extent, then go to next extent */
5590 next1 = ext4_ext_next_allocated_block(path1);
5591 next2 = ext4_ext_next_allocated_block(path2);
5592 /* If hole before extent, then shift to that extent */
5593 if (e1_blk > lblk1)
5594 next1 = e1_blk;
5595 if (e2_blk > lblk2)
5596 next2 = e1_blk;
5597 /* Do we have something to swap */
5598 if (next1 == EXT_MAX_BLOCKS || next2 == EXT_MAX_BLOCKS)
Theodore Ts'o19008f62014-08-31 15:03:14 -04005599 goto finish;
Dmitry Monakhovfcf6b1b72014-08-30 23:52:19 -04005600 /* Move to the rightest boundary */
5601 len = next1 - lblk1;
5602 if (len < next2 - lblk2)
5603 len = next2 - lblk2;
5604 if (len > count)
5605 len = count;
5606 lblk1 += len;
5607 lblk2 += len;
5608 count -= len;
5609 goto repeat;
5610 }
5611
5612 /* Prepare left boundary */
5613 if (e1_blk < lblk1) {
5614 split = 1;
5615 *erp = ext4_force_split_extent_at(handle, inode1,
Theodore Ts'odfe50802014-09-01 14:37:09 -04005616 &path1, lblk1, 0);
Theodore Ts'o19008f62014-08-31 15:03:14 -04005617 if (unlikely(*erp))
5618 goto finish;
Dmitry Monakhovfcf6b1b72014-08-30 23:52:19 -04005619 }
5620 if (e2_blk < lblk2) {
5621 split = 1;
5622 *erp = ext4_force_split_extent_at(handle, inode2,
Theodore Ts'odfe50802014-09-01 14:37:09 -04005623 &path2, lblk2, 0);
Theodore Ts'o19008f62014-08-31 15:03:14 -04005624 if (unlikely(*erp))
5625 goto finish;
Dmitry Monakhovfcf6b1b72014-08-30 23:52:19 -04005626 }
Theodore Ts'odfe50802014-09-01 14:37:09 -04005627 /* ext4_split_extent_at() may result in leaf extent split,
Dmitry Monakhovfcf6b1b72014-08-30 23:52:19 -04005628 * path must to be revalidated. */
5629 if (split)
5630 goto repeat;
5631
5632 /* Prepare right boundary */
5633 len = count;
5634 if (len > e1_blk + e1_len - lblk1)
5635 len = e1_blk + e1_len - lblk1;
5636 if (len > e2_blk + e2_len - lblk2)
5637 len = e2_blk + e2_len - lblk2;
5638
5639 if (len != e1_len) {
5640 split = 1;
5641 *erp = ext4_force_split_extent_at(handle, inode1,
Theodore Ts'odfe50802014-09-01 14:37:09 -04005642 &path1, lblk1 + len, 0);
Theodore Ts'o19008f62014-08-31 15:03:14 -04005643 if (unlikely(*erp))
5644 goto finish;
Dmitry Monakhovfcf6b1b72014-08-30 23:52:19 -04005645 }
5646 if (len != e2_len) {
5647 split = 1;
5648 *erp = ext4_force_split_extent_at(handle, inode2,
Theodore Ts'odfe50802014-09-01 14:37:09 -04005649 &path2, lblk2 + len, 0);
Dmitry Monakhovfcf6b1b72014-08-30 23:52:19 -04005650 if (*erp)
Theodore Ts'o19008f62014-08-31 15:03:14 -04005651 goto finish;
Dmitry Monakhovfcf6b1b72014-08-30 23:52:19 -04005652 }
Theodore Ts'odfe50802014-09-01 14:37:09 -04005653 /* ext4_split_extent_at() may result in leaf extent split,
Dmitry Monakhovfcf6b1b72014-08-30 23:52:19 -04005654 * path must to be revalidated. */
5655 if (split)
5656 goto repeat;
5657
5658 BUG_ON(e2_len != e1_len);
5659 *erp = ext4_ext_get_access(handle, inode1, path1 + path1->p_depth);
Theodore Ts'o19008f62014-08-31 15:03:14 -04005660 if (unlikely(*erp))
5661 goto finish;
Dmitry Monakhovfcf6b1b72014-08-30 23:52:19 -04005662 *erp = ext4_ext_get_access(handle, inode2, path2 + path2->p_depth);
Theodore Ts'o19008f62014-08-31 15:03:14 -04005663 if (unlikely(*erp))
5664 goto finish;
Dmitry Monakhovfcf6b1b72014-08-30 23:52:19 -04005665
5666 /* Both extents are fully inside boundaries. Swap it now */
5667 tmp_ex = *ex1;
5668 ext4_ext_store_pblock(ex1, ext4_ext_pblock(ex2));
5669 ext4_ext_store_pblock(ex2, ext4_ext_pblock(&tmp_ex));
5670 ex1->ee_len = cpu_to_le16(e2_len);
5671 ex2->ee_len = cpu_to_le16(e1_len);
5672 if (unwritten)
5673 ext4_ext_mark_unwritten(ex2);
5674 if (ext4_ext_is_unwritten(&tmp_ex))
5675 ext4_ext_mark_unwritten(ex1);
5676
5677 ext4_ext_try_to_merge(handle, inode2, path2, ex2);
5678 ext4_ext_try_to_merge(handle, inode1, path1, ex1);
5679 *erp = ext4_ext_dirty(handle, inode2, path2 +
5680 path2->p_depth);
Theodore Ts'o19008f62014-08-31 15:03:14 -04005681 if (unlikely(*erp))
5682 goto finish;
Dmitry Monakhovfcf6b1b72014-08-30 23:52:19 -04005683 *erp = ext4_ext_dirty(handle, inode1, path1 +
5684 path1->p_depth);
5685 /*
5686 * Looks scarry ah..? second inode already points to new blocks,
5687 * and it was successfully dirtied. But luckily error may happen
5688 * only due to journal error, so full transaction will be
5689 * aborted anyway.
5690 */
Theodore Ts'o19008f62014-08-31 15:03:14 -04005691 if (unlikely(*erp))
5692 goto finish;
Dmitry Monakhovfcf6b1b72014-08-30 23:52:19 -04005693 lblk1 += len;
5694 lblk2 += len;
5695 replaced_count += len;
5696 count -= len;
5697
5698 repeat:
5699 if (path1) {
5700 ext4_ext_drop_refs(path1);
5701 kfree(path1);
5702 path1 = NULL;
5703 }
5704 if (path2) {
5705 ext4_ext_drop_refs(path2);
5706 kfree(path2);
5707 path2 = NULL;
5708 }
5709 }
Dmitry Monakhovfcf6b1b72014-08-30 23:52:19 -04005710 return replaced_count;
5711}