blob: 4da228a0e6d02f3cbd1e680e181f3ed88a82f6f3 [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,
101 struct ext4_ext_path *path,
102 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,
108 struct ext4_ext_path *path,
109 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;
164 if (path->p_bh) {
Darrick J. Wong7ac59902012-04-29 18:37:10 -0400165 ext4_extent_block_csum_set(inode, ext_block_hdr(path->p_bh));
Alex Tomasa86c6182006-10-11 01:21:03 -0700166 /* path points to block */
Theodore Ts'o9ea7a0d2011-09-04 10:18:14 -0400167 err = __ext4_handle_dirty_metadata(where, line, handle,
168 inode, path->p_bh);
Alex Tomasa86c6182006-10-11 01:21:03 -0700169 } else {
170 /* path points to leaf/index in inode body */
171 err = ext4_mark_inode_dirty(handle, inode);
172 }
173 return err;
174}
175
Alex Tomasf65e6fb2006-10-11 01:21:05 -0700176static ext4_fsblk_t ext4_ext_find_goal(struct inode *inode,
Alex Tomasa86c6182006-10-11 01:21:03 -0700177 struct ext4_ext_path *path,
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -0500178 ext4_lblk_t block)
Alex Tomasa86c6182006-10-11 01:21:03 -0700179{
Alex Tomasa86c6182006-10-11 01:21:03 -0700180 if (path) {
Yongqiang Yang81fdbb42011-10-29 09:23:38 -0400181 int depth = path->p_depth;
Alex Tomasa86c6182006-10-11 01:21:03 -0700182 struct ext4_extent *ex;
Alex Tomasa86c6182006-10-11 01:21:03 -0700183
Kazuya Mioad4fb9c2011-01-10 12:12:28 -0500184 /*
185 * Try to predict block placement assuming that we are
186 * filling in a file which will eventually be
187 * non-sparse --- i.e., in the case of libbfd writing
188 * an ELF object sections out-of-order but in a way
189 * the eventually results in a contiguous object or
190 * executable file, or some database extending a table
191 * space file. However, this is actually somewhat
192 * non-ideal if we are writing a sparse file such as
193 * qemu or KVM writing a raw image file that is going
194 * to stay fairly sparse, since it will end up
195 * fragmenting the file system's free space. Maybe we
196 * should have some hueristics or some way to allow
197 * userspace to pass a hint to file system,
Tao Mab8d65682011-01-21 23:21:31 +0800198 * especially if the latter case turns out to be
Kazuya Mioad4fb9c2011-01-10 12:12:28 -0500199 * common.
200 */
Avantika Mathur7e028972006-12-06 20:41:33 -0800201 ex = path[depth].p_ext;
Kazuya Mioad4fb9c2011-01-10 12:12:28 -0500202 if (ex) {
203 ext4_fsblk_t ext_pblk = ext4_ext_pblock(ex);
204 ext4_lblk_t ext_block = le32_to_cpu(ex->ee_block);
205
206 if (block > ext_block)
207 return ext_pblk + (block - ext_block);
208 else
209 return ext_pblk - (ext_block - block);
210 }
Alex Tomasa86c6182006-10-11 01:21:03 -0700211
Randy Dunlapd0d856e2006-10-11 01:21:07 -0700212 /* it looks like index is empty;
213 * try to find starting block from index itself */
Alex Tomasa86c6182006-10-11 01:21:03 -0700214 if (path[depth].p_bh)
215 return path[depth].p_bh->b_blocknr;
216 }
217
218 /* OK. use inode's group */
Eric Sandeenf86186b2011-06-28 10:01:31 -0400219 return ext4_inode_to_goal_block(inode);
Alex Tomasa86c6182006-10-11 01:21:03 -0700220}
221
Aneesh Kumar K.V654b4902008-07-11 19:27:31 -0400222/*
223 * Allocation for a meta data block
224 */
Alex Tomasf65e6fb2006-10-11 01:21:05 -0700225static ext4_fsblk_t
Aneesh Kumar K.V654b4902008-07-11 19:27:31 -0400226ext4_ext_new_meta_block(handle_t *handle, struct inode *inode,
Alex Tomasa86c6182006-10-11 01:21:03 -0700227 struct ext4_ext_path *path,
Allison Henderson55f020d2011-05-25 07:41:26 -0400228 struct ext4_extent *ex, int *err, unsigned int flags)
Alex Tomasa86c6182006-10-11 01:21:03 -0700229{
Alex Tomasf65e6fb2006-10-11 01:21:05 -0700230 ext4_fsblk_t goal, newblock;
Alex Tomasa86c6182006-10-11 01:21:03 -0700231
232 goal = ext4_ext_find_goal(inode, path, le32_to_cpu(ex->ee_block));
Allison Henderson55f020d2011-05-25 07:41:26 -0400233 newblock = ext4_new_meta_blocks(handle, inode, goal, flags,
234 NULL, err);
Alex Tomasa86c6182006-10-11 01:21:03 -0700235 return newblock;
236}
237
Theodore Ts'o55ad63b2009-08-28 10:40:33 -0400238static inline int ext4_ext_space_block(struct inode *inode, int check)
Alex Tomasa86c6182006-10-11 01:21:03 -0700239{
240 int size;
241
242 size = (inode->i_sb->s_blocksize - sizeof(struct ext4_extent_header))
243 / sizeof(struct ext4_extent);
Robert P. J. Daybbf2f9f2007-02-17 19:20:16 +0100244#ifdef AGGRESSIVE_TEST
Yongqiang Yang02dc62fb2011-10-29 09:29:11 -0400245 if (!check && size > 6)
246 size = 6;
Alex Tomasa86c6182006-10-11 01:21:03 -0700247#endif
248 return size;
249}
250
Theodore Ts'o55ad63b2009-08-28 10:40:33 -0400251static inline int ext4_ext_space_block_idx(struct inode *inode, int check)
Alex Tomasa86c6182006-10-11 01:21:03 -0700252{
253 int size;
254
255 size = (inode->i_sb->s_blocksize - sizeof(struct ext4_extent_header))
256 / sizeof(struct ext4_extent_idx);
Robert P. J. Daybbf2f9f2007-02-17 19:20:16 +0100257#ifdef AGGRESSIVE_TEST
Yongqiang Yang02dc62fb2011-10-29 09:29:11 -0400258 if (!check && size > 5)
259 size = 5;
Alex Tomasa86c6182006-10-11 01:21:03 -0700260#endif
261 return size;
262}
263
Theodore Ts'o55ad63b2009-08-28 10:40:33 -0400264static inline int ext4_ext_space_root(struct inode *inode, int check)
Alex Tomasa86c6182006-10-11 01:21:03 -0700265{
266 int size;
267
268 size = sizeof(EXT4_I(inode)->i_data);
269 size -= sizeof(struct ext4_extent_header);
270 size /= sizeof(struct ext4_extent);
Robert P. J. Daybbf2f9f2007-02-17 19:20:16 +0100271#ifdef AGGRESSIVE_TEST
Yongqiang Yang02dc62fb2011-10-29 09:29:11 -0400272 if (!check && size > 3)
273 size = 3;
Alex Tomasa86c6182006-10-11 01:21:03 -0700274#endif
275 return size;
276}
277
Theodore Ts'o55ad63b2009-08-28 10:40:33 -0400278static inline int ext4_ext_space_root_idx(struct inode *inode, int check)
Alex Tomasa86c6182006-10-11 01:21:03 -0700279{
280 int size;
281
282 size = sizeof(EXT4_I(inode)->i_data);
283 size -= sizeof(struct ext4_extent_header);
284 size /= sizeof(struct ext4_extent_idx);
Robert P. J. Daybbf2f9f2007-02-17 19:20:16 +0100285#ifdef AGGRESSIVE_TEST
Yongqiang Yang02dc62fb2011-10-29 09:29:11 -0400286 if (!check && size > 4)
287 size = 4;
Alex Tomasa86c6182006-10-11 01:21:03 -0700288#endif
289 return size;
290}
291
Mingming Caod2a17632008-07-14 17:52:37 -0400292/*
293 * Calculate the number of metadata blocks needed
294 * to allocate @blocks
295 * Worse case is one block per extent
296 */
Theodore Ts'o01f49d02011-01-10 12:13:03 -0500297int ext4_ext_calc_metadata_amount(struct inode *inode, ext4_lblk_t lblock)
Mingming Caod2a17632008-07-14 17:52:37 -0400298{
Theodore Ts'o9d0be502010-01-01 02:41:30 -0500299 struct ext4_inode_info *ei = EXT4_I(inode);
Yongqiang Yang81fdbb42011-10-29 09:23:38 -0400300 int idxs;
Mingming Caod2a17632008-07-14 17:52:37 -0400301
Theodore Ts'o9d0be502010-01-01 02:41:30 -0500302 idxs = ((inode->i_sb->s_blocksize - sizeof(struct ext4_extent_header))
303 / sizeof(struct ext4_extent_idx));
Mingming Caod2a17632008-07-14 17:52:37 -0400304
305 /*
Theodore Ts'o9d0be502010-01-01 02:41:30 -0500306 * If the new delayed allocation block is contiguous with the
307 * previous da block, it can share index blocks with the
308 * previous block, so we only need to allocate a new index
309 * block every idxs leaf blocks. At ldxs**2 blocks, we need
310 * an additional index block, and at ldxs**3 blocks, yet
311 * another index blocks.
Mingming Caod2a17632008-07-14 17:52:37 -0400312 */
Theodore Ts'o9d0be502010-01-01 02:41:30 -0500313 if (ei->i_da_metadata_calc_len &&
314 ei->i_da_metadata_calc_last_lblock+1 == lblock) {
Yongqiang Yang81fdbb42011-10-29 09:23:38 -0400315 int num = 0;
316
Theodore Ts'o9d0be502010-01-01 02:41:30 -0500317 if ((ei->i_da_metadata_calc_len % idxs) == 0)
318 num++;
319 if ((ei->i_da_metadata_calc_len % (idxs*idxs)) == 0)
320 num++;
321 if ((ei->i_da_metadata_calc_len % (idxs*idxs*idxs)) == 0) {
322 num++;
323 ei->i_da_metadata_calc_len = 0;
324 } else
325 ei->i_da_metadata_calc_len++;
326 ei->i_da_metadata_calc_last_lblock++;
327 return num;
328 }
Mingming Caod2a17632008-07-14 17:52:37 -0400329
Theodore Ts'o9d0be502010-01-01 02:41:30 -0500330 /*
331 * In the worst case we need a new set of index blocks at
332 * every level of the inode's extent tree.
333 */
334 ei->i_da_metadata_calc_len = 1;
335 ei->i_da_metadata_calc_last_lblock = lblock;
336 return ext_depth(inode) + 1;
Mingming Caod2a17632008-07-14 17:52:37 -0400337}
338
Alex Tomasc29c0ae2007-07-18 09:19:09 -0400339static int
340ext4_ext_max_entries(struct inode *inode, int depth)
341{
342 int max;
343
344 if (depth == ext_depth(inode)) {
345 if (depth == 0)
Theodore Ts'o55ad63b2009-08-28 10:40:33 -0400346 max = ext4_ext_space_root(inode, 1);
Alex Tomasc29c0ae2007-07-18 09:19:09 -0400347 else
Theodore Ts'o55ad63b2009-08-28 10:40:33 -0400348 max = ext4_ext_space_root_idx(inode, 1);
Alex Tomasc29c0ae2007-07-18 09:19:09 -0400349 } else {
350 if (depth == 0)
Theodore Ts'o55ad63b2009-08-28 10:40:33 -0400351 max = ext4_ext_space_block(inode, 1);
Alex Tomasc29c0ae2007-07-18 09:19:09 -0400352 else
Theodore Ts'o55ad63b2009-08-28 10:40:33 -0400353 max = ext4_ext_space_block_idx(inode, 1);
Alex Tomasc29c0ae2007-07-18 09:19:09 -0400354 }
355
356 return max;
357}
358
Aneesh Kumar K.V56b19862009-03-12 09:51:20 -0400359static int ext4_valid_extent(struct inode *inode, struct ext4_extent *ext)
360{
Theodore Ts'obf89d162010-10-27 21:30:14 -0400361 ext4_fsblk_t block = ext4_ext_pblock(ext);
Aneesh Kumar K.V56b19862009-03-12 09:51:20 -0400362 int len = ext4_ext_get_actual_len(ext);
Eryu Guan5946d082013-12-03 21:22:21 -0500363 ext4_lblk_t lblock = le32_to_cpu(ext->ee_block);
364 ext4_lblk_t last = lblock + len - 1;
Theodore Ts'oe84a26c2009-04-22 20:52:25 -0400365
Eryu Guan5946d082013-12-03 21:22:21 -0500366 if (lblock > last)
Theodore Ts'o31d4f3a2012-03-11 23:30:16 -0400367 return 0;
Theodore Ts'o6fd058f2009-05-17 15:38:01 -0400368 return ext4_data_block_valid(EXT4_SB(inode->i_sb), block, len);
Aneesh Kumar K.V56b19862009-03-12 09:51:20 -0400369}
370
371static int ext4_valid_extent_idx(struct inode *inode,
372 struct ext4_extent_idx *ext_idx)
373{
Theodore Ts'obf89d162010-10-27 21:30:14 -0400374 ext4_fsblk_t block = ext4_idx_pblock(ext_idx);
Theodore Ts'oe84a26c2009-04-22 20:52:25 -0400375
Theodore Ts'o6fd058f2009-05-17 15:38:01 -0400376 return ext4_data_block_valid(EXT4_SB(inode->i_sb), block, 1);
Aneesh Kumar K.V56b19862009-03-12 09:51:20 -0400377}
378
379static int ext4_valid_extent_entries(struct inode *inode,
380 struct ext4_extent_header *eh,
381 int depth)
382{
Aneesh Kumar K.V56b19862009-03-12 09:51:20 -0400383 unsigned short entries;
384 if (eh->eh_entries == 0)
385 return 1;
386
387 entries = le16_to_cpu(eh->eh_entries);
388
389 if (depth == 0) {
390 /* leaf entries */
Yongqiang Yang81fdbb42011-10-29 09:23:38 -0400391 struct ext4_extent *ext = EXT_FIRST_EXTENT(eh);
Eryu Guan5946d082013-12-03 21:22:21 -0500392 struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
393 ext4_fsblk_t pblock = 0;
394 ext4_lblk_t lblock = 0;
395 ext4_lblk_t prev = 0;
396 int len = 0;
Aneesh Kumar K.V56b19862009-03-12 09:51:20 -0400397 while (entries) {
398 if (!ext4_valid_extent(inode, ext))
399 return 0;
Eryu Guan5946d082013-12-03 21:22:21 -0500400
401 /* Check for overlapping extents */
402 lblock = le32_to_cpu(ext->ee_block);
403 len = ext4_ext_get_actual_len(ext);
404 if ((lblock <= prev) && prev) {
405 pblock = ext4_ext_pblock(ext);
406 es->s_last_error_block = cpu_to_le64(pblock);
407 return 0;
408 }
Aneesh Kumar K.V56b19862009-03-12 09:51:20 -0400409 ext++;
410 entries--;
Eryu Guan5946d082013-12-03 21:22:21 -0500411 prev = lblock + len - 1;
Aneesh Kumar K.V56b19862009-03-12 09:51:20 -0400412 }
413 } else {
Yongqiang Yang81fdbb42011-10-29 09:23:38 -0400414 struct ext4_extent_idx *ext_idx = EXT_FIRST_INDEX(eh);
Aneesh Kumar K.V56b19862009-03-12 09:51:20 -0400415 while (entries) {
416 if (!ext4_valid_extent_idx(inode, ext_idx))
417 return 0;
418 ext_idx++;
419 entries--;
420 }
421 }
422 return 1;
423}
424
Theodore Ts'oc398eda2010-07-27 11:56:40 -0400425static int __ext4_ext_check(const char *function, unsigned int line,
426 struct inode *inode, struct ext4_extent_header *eh,
Theodore Ts'oc3491792013-08-16 21:21:41 -0400427 int depth, ext4_fsblk_t pblk)
Alex Tomasc29c0ae2007-07-18 09:19:09 -0400428{
429 const char *error_msg;
430 int max = 0;
431
432 if (unlikely(eh->eh_magic != EXT4_EXT_MAGIC)) {
433 error_msg = "invalid magic";
434 goto corrupted;
435 }
436 if (unlikely(le16_to_cpu(eh->eh_depth) != depth)) {
437 error_msg = "unexpected eh_depth";
438 goto corrupted;
439 }
440 if (unlikely(eh->eh_max == 0)) {
441 error_msg = "invalid eh_max";
442 goto corrupted;
443 }
444 max = ext4_ext_max_entries(inode, depth);
445 if (unlikely(le16_to_cpu(eh->eh_max) > max)) {
446 error_msg = "too large eh_max";
447 goto corrupted;
448 }
449 if (unlikely(le16_to_cpu(eh->eh_entries) > le16_to_cpu(eh->eh_max))) {
450 error_msg = "invalid eh_entries";
451 goto corrupted;
452 }
Aneesh Kumar K.V56b19862009-03-12 09:51:20 -0400453 if (!ext4_valid_extent_entries(inode, eh, depth)) {
454 error_msg = "invalid extent entries";
455 goto corrupted;
456 }
Darrick J. Wong7ac59902012-04-29 18:37:10 -0400457 /* Verify checksum on non-root extent tree nodes */
458 if (ext_depth(inode) != depth &&
459 !ext4_extent_block_csum_verify(inode, eh)) {
460 error_msg = "extent tree corrupted";
461 goto corrupted;
462 }
Alex Tomasc29c0ae2007-07-18 09:19:09 -0400463 return 0;
464
465corrupted:
Theodore Ts'oc398eda2010-07-27 11:56:40 -0400466 ext4_error_inode(inode, function, line, 0,
Theodore Ts'oc3491792013-08-16 21:21:41 -0400467 "pblk %llu bad header/extent: %s - magic %x, "
468 "entries %u, max %u(%u), depth %u(%u)",
469 (unsigned long long) pblk, error_msg,
470 le16_to_cpu(eh->eh_magic),
471 le16_to_cpu(eh->eh_entries), le16_to_cpu(eh->eh_max),
472 max, le16_to_cpu(eh->eh_depth), depth);
Alex Tomasc29c0ae2007-07-18 09:19:09 -0400473 return -EIO;
474}
475
Theodore Ts'oc3491792013-08-16 21:21:41 -0400476#define ext4_ext_check(inode, eh, depth, pblk) \
477 __ext4_ext_check(__func__, __LINE__, (inode), (eh), (depth), (pblk))
Alex Tomasc29c0ae2007-07-18 09:19:09 -0400478
Aneesh Kumar K.V7a262f72009-03-27 16:39:58 -0400479int ext4_ext_check_inode(struct inode *inode)
480{
Theodore Ts'oc3491792013-08-16 21:21:41 -0400481 return ext4_ext_check(inode, ext_inode_hdr(inode), ext_depth(inode), 0);
Aneesh Kumar K.V7a262f72009-03-27 16:39:58 -0400482}
483
Theodore Ts'o7d7ea892013-08-16 21:20:41 -0400484static struct buffer_head *
485__read_extent_tree_block(const char *function, unsigned int line,
Theodore Ts'o107a7bd2013-08-16 21:23:41 -0400486 struct inode *inode, ext4_fsblk_t pblk, int depth,
487 int flags)
Darrick J. Wongf8489122012-04-29 18:21:10 -0400488{
Theodore Ts'o7d7ea892013-08-16 21:20:41 -0400489 struct buffer_head *bh;
490 int err;
Darrick J. Wongf8489122012-04-29 18:21:10 -0400491
Theodore Ts'o7d7ea892013-08-16 21:20:41 -0400492 bh = sb_getblk(inode->i_sb, pblk);
493 if (unlikely(!bh))
494 return ERR_PTR(-ENOMEM);
495
496 if (!bh_uptodate_or_lock(bh)) {
497 trace_ext4_ext_load_extent(inode, pblk, _RET_IP_);
498 err = bh_submit_read(bh);
499 if (err < 0)
500 goto errout;
501 }
Theodore Ts'o7869a4a2013-08-16 22:05:14 -0400502 if (buffer_verified(bh) && !(flags & EXT4_EX_FORCE_CACHE))
Theodore Ts'o7d7ea892013-08-16 21:20:41 -0400503 return bh;
504 err = __ext4_ext_check(function, line, inode,
Theodore Ts'oc3491792013-08-16 21:21:41 -0400505 ext_block_hdr(bh), depth, pblk);
Theodore Ts'o7d7ea892013-08-16 21:20:41 -0400506 if (err)
507 goto errout;
Darrick J. Wongf8489122012-04-29 18:21:10 -0400508 set_buffer_verified(bh);
Theodore Ts'o107a7bd2013-08-16 21:23:41 -0400509 /*
510 * If this is a leaf block, cache all of its entries
511 */
512 if (!(flags & EXT4_EX_NOCACHE) && depth == 0) {
513 struct ext4_extent_header *eh = ext_block_hdr(bh);
514 struct ext4_extent *ex = EXT_FIRST_EXTENT(eh);
515 ext4_lblk_t prev = 0;
516 int i;
517
518 for (i = le16_to_cpu(eh->eh_entries); i > 0; i--, ex++) {
519 unsigned int status = EXTENT_STATUS_WRITTEN;
520 ext4_lblk_t lblk = le32_to_cpu(ex->ee_block);
521 int len = ext4_ext_get_actual_len(ex);
522
523 if (prev && (prev != lblk))
524 ext4_es_cache_extent(inode, prev,
525 lblk - prev, ~0,
526 EXTENT_STATUS_HOLE);
527
Lukas Czerner556615d2014-04-20 23:45:47 -0400528 if (ext4_ext_is_unwritten(ex))
Theodore Ts'o107a7bd2013-08-16 21:23:41 -0400529 status = EXTENT_STATUS_UNWRITTEN;
530 ext4_es_cache_extent(inode, lblk, len,
531 ext4_ext_pblock(ex), status);
532 prev = lblk + len;
533 }
534 }
Theodore Ts'o7d7ea892013-08-16 21:20:41 -0400535 return bh;
536errout:
537 put_bh(bh);
538 return ERR_PTR(err);
539
Darrick J. Wongf8489122012-04-29 18:21:10 -0400540}
541
Theodore Ts'o107a7bd2013-08-16 21:23:41 -0400542#define read_extent_tree_block(inode, pblk, depth, flags) \
543 __read_extent_tree_block(__func__, __LINE__, (inode), (pblk), \
544 (depth), (flags))
Darrick J. Wongf8489122012-04-29 18:21:10 -0400545
Theodore Ts'o7869a4a2013-08-16 22:05:14 -0400546/*
547 * This function is called to cache a file's extent information in the
548 * extent status tree
549 */
550int ext4_ext_precache(struct inode *inode)
551{
552 struct ext4_inode_info *ei = EXT4_I(inode);
553 struct ext4_ext_path *path = NULL;
554 struct buffer_head *bh;
555 int i = 0, depth, ret = 0;
556
557 if (!ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))
558 return 0; /* not an extent-mapped inode */
559
560 down_read(&ei->i_data_sem);
561 depth = ext_depth(inode);
562
563 path = kzalloc(sizeof(struct ext4_ext_path) * (depth + 1),
564 GFP_NOFS);
565 if (path == NULL) {
566 up_read(&ei->i_data_sem);
567 return -ENOMEM;
568 }
569
570 /* Don't cache anything if there are no external extent blocks */
571 if (depth == 0)
572 goto out;
573 path[0].p_hdr = ext_inode_hdr(inode);
574 ret = ext4_ext_check(inode, path[0].p_hdr, depth, 0);
575 if (ret)
576 goto out;
577 path[0].p_idx = EXT_FIRST_INDEX(path[0].p_hdr);
578 while (i >= 0) {
579 /*
580 * If this is a leaf block or we've reached the end of
581 * the index block, go up
582 */
583 if ((i == depth) ||
584 path[i].p_idx > EXT_LAST_INDEX(path[i].p_hdr)) {
585 brelse(path[i].p_bh);
586 path[i].p_bh = NULL;
587 i--;
588 continue;
589 }
590 bh = read_extent_tree_block(inode,
591 ext4_idx_pblock(path[i].p_idx++),
592 depth - i - 1,
593 EXT4_EX_FORCE_CACHE);
594 if (IS_ERR(bh)) {
595 ret = PTR_ERR(bh);
596 break;
597 }
598 i++;
599 path[i].p_bh = bh;
600 path[i].p_hdr = ext_block_hdr(bh);
601 path[i].p_idx = EXT_FIRST_INDEX(path[i].p_hdr);
602 }
603 ext4_set_inode_state(inode, EXT4_STATE_EXT_PRECACHED);
604out:
605 up_read(&ei->i_data_sem);
606 ext4_ext_drop_refs(path);
607 kfree(path);
608 return ret;
609}
610
Alex Tomasa86c6182006-10-11 01:21:03 -0700611#ifdef EXT_DEBUG
612static void ext4_ext_show_path(struct inode *inode, struct ext4_ext_path *path)
613{
614 int k, l = path->p_depth;
615
616 ext_debug("path:");
617 for (k = 0; k <= l; k++, path++) {
618 if (path->p_idx) {
Mingming Cao2ae02102006-10-11 01:21:11 -0700619 ext_debug(" %d->%llu", le32_to_cpu(path->p_idx->ei_block),
Theodore Ts'obf89d162010-10-27 21:30:14 -0400620 ext4_idx_pblock(path->p_idx));
Alex Tomasa86c6182006-10-11 01:21:03 -0700621 } else if (path->p_ext) {
Mingming553f9002009-09-18 13:34:55 -0400622 ext_debug(" %d:[%d]%d:%llu ",
Alex Tomasa86c6182006-10-11 01:21:03 -0700623 le32_to_cpu(path->p_ext->ee_block),
Lukas Czerner556615d2014-04-20 23:45:47 -0400624 ext4_ext_is_unwritten(path->p_ext),
Amit Aroraa2df2a62007-07-17 21:42:41 -0400625 ext4_ext_get_actual_len(path->p_ext),
Theodore Ts'obf89d162010-10-27 21:30:14 -0400626 ext4_ext_pblock(path->p_ext));
Alex Tomasa86c6182006-10-11 01:21:03 -0700627 } else
628 ext_debug(" []");
629 }
630 ext_debug("\n");
631}
632
633static void ext4_ext_show_leaf(struct inode *inode, struct ext4_ext_path *path)
634{
635 int depth = ext_depth(inode);
636 struct ext4_extent_header *eh;
637 struct ext4_extent *ex;
638 int i;
639
640 if (!path)
641 return;
642
643 eh = path[depth].p_hdr;
644 ex = EXT_FIRST_EXTENT(eh);
645
Mingming553f9002009-09-18 13:34:55 -0400646 ext_debug("Displaying leaf extents for inode %lu\n", inode->i_ino);
647
Alex Tomasa86c6182006-10-11 01:21:03 -0700648 for (i = 0; i < le16_to_cpu(eh->eh_entries); i++, ex++) {
Mingming553f9002009-09-18 13:34:55 -0400649 ext_debug("%d:[%d]%d:%llu ", le32_to_cpu(ex->ee_block),
Lukas Czerner556615d2014-04-20 23:45:47 -0400650 ext4_ext_is_unwritten(ex),
Theodore Ts'obf89d162010-10-27 21:30:14 -0400651 ext4_ext_get_actual_len(ex), ext4_ext_pblock(ex));
Alex Tomasa86c6182006-10-11 01:21:03 -0700652 }
653 ext_debug("\n");
654}
Yongqiang Yang1b16da72011-05-25 17:41:48 -0400655
656static void ext4_ext_show_move(struct inode *inode, struct ext4_ext_path *path,
657 ext4_fsblk_t newblock, int level)
658{
659 int depth = ext_depth(inode);
660 struct ext4_extent *ex;
661
662 if (depth != level) {
663 struct ext4_extent_idx *idx;
664 idx = path[level].p_idx;
665 while (idx <= EXT_MAX_INDEX(path[level].p_hdr)) {
666 ext_debug("%d: move %d:%llu in new index %llu\n", level,
667 le32_to_cpu(idx->ei_block),
668 ext4_idx_pblock(idx),
669 newblock);
670 idx++;
671 }
672
673 return;
674 }
675
676 ex = path[depth].p_ext;
677 while (ex <= EXT_MAX_EXTENT(path[depth].p_hdr)) {
678 ext_debug("move %d:%llu:[%d]%d in new leaf %llu\n",
679 le32_to_cpu(ex->ee_block),
680 ext4_ext_pblock(ex),
Lukas Czerner556615d2014-04-20 23:45:47 -0400681 ext4_ext_is_unwritten(ex),
Yongqiang Yang1b16da72011-05-25 17:41:48 -0400682 ext4_ext_get_actual_len(ex),
683 newblock);
684 ex++;
685 }
686}
687
Alex Tomasa86c6182006-10-11 01:21:03 -0700688#else
Theodore Ts'oaf5bc922008-09-08 22:25:24 -0400689#define ext4_ext_show_path(inode, path)
690#define ext4_ext_show_leaf(inode, path)
Yongqiang Yang1b16da72011-05-25 17:41:48 -0400691#define ext4_ext_show_move(inode, path, newblock, level)
Alex Tomasa86c6182006-10-11 01:21:03 -0700692#endif
693
Aneesh Kumar K.Vb35905c2008-02-25 16:54:37 -0500694void ext4_ext_drop_refs(struct ext4_ext_path *path)
Alex Tomasa86c6182006-10-11 01:21:03 -0700695{
696 int depth = path->p_depth;
697 int i;
698
699 for (i = 0; i <= depth; i++, path++)
700 if (path->p_bh) {
701 brelse(path->p_bh);
702 path->p_bh = NULL;
703 }
704}
705
706/*
Randy Dunlapd0d856e2006-10-11 01:21:07 -0700707 * ext4_ext_binsearch_idx:
708 * binary search for the closest index of the given block
Alex Tomasc29c0ae2007-07-18 09:19:09 -0400709 * the header must be checked before calling this
Alex Tomasa86c6182006-10-11 01:21:03 -0700710 */
711static void
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -0500712ext4_ext_binsearch_idx(struct inode *inode,
713 struct ext4_ext_path *path, ext4_lblk_t block)
Alex Tomasa86c6182006-10-11 01:21:03 -0700714{
715 struct ext4_extent_header *eh = path->p_hdr;
716 struct ext4_extent_idx *r, *l, *m;
717
Alex Tomasa86c6182006-10-11 01:21:03 -0700718
Eric Sandeenbba90742008-01-28 23:58:27 -0500719 ext_debug("binsearch for %u(idx): ", block);
Alex Tomasa86c6182006-10-11 01:21:03 -0700720
721 l = EXT_FIRST_INDEX(eh) + 1;
Dmitry Monakhove9f410b2007-07-18 09:09:15 -0400722 r = EXT_LAST_INDEX(eh);
Alex Tomasa86c6182006-10-11 01:21:03 -0700723 while (l <= r) {
724 m = l + (r - l) / 2;
725 if (block < le32_to_cpu(m->ei_block))
726 r = m - 1;
727 else
728 l = m + 1;
Dmitry Monakhov26d535e2007-07-18 08:33:37 -0400729 ext_debug("%p(%u):%p(%u):%p(%u) ", l, le32_to_cpu(l->ei_block),
730 m, le32_to_cpu(m->ei_block),
731 r, le32_to_cpu(r->ei_block));
Alex Tomasa86c6182006-10-11 01:21:03 -0700732 }
733
734 path->p_idx = l - 1;
Zheng Liu4a3c3a52012-05-28 17:55:16 -0400735 ext_debug(" -> %u->%lld ", le32_to_cpu(path->p_idx->ei_block),
Theodore Ts'obf89d162010-10-27 21:30:14 -0400736 ext4_idx_pblock(path->p_idx));
Alex Tomasa86c6182006-10-11 01:21:03 -0700737
738#ifdef CHECK_BINSEARCH
739 {
740 struct ext4_extent_idx *chix, *ix;
741 int k;
742
743 chix = ix = EXT_FIRST_INDEX(eh);
744 for (k = 0; k < le16_to_cpu(eh->eh_entries); k++, ix++) {
745 if (k != 0 &&
746 le32_to_cpu(ix->ei_block) <= le32_to_cpu(ix[-1].ei_block)) {
Theodore Ts'o4776004f2008-09-08 23:00:52 -0400747 printk(KERN_DEBUG "k=%d, ix=0x%p, "
748 "first=0x%p\n", k,
749 ix, EXT_FIRST_INDEX(eh));
750 printk(KERN_DEBUG "%u <= %u\n",
Alex Tomasa86c6182006-10-11 01:21:03 -0700751 le32_to_cpu(ix->ei_block),
752 le32_to_cpu(ix[-1].ei_block));
753 }
754 BUG_ON(k && le32_to_cpu(ix->ei_block)
Dave Kleikamp8c55e202007-05-24 13:04:54 -0400755 <= le32_to_cpu(ix[-1].ei_block));
Alex Tomasa86c6182006-10-11 01:21:03 -0700756 if (block < le32_to_cpu(ix->ei_block))
757 break;
758 chix = ix;
759 }
760 BUG_ON(chix != path->p_idx);
761 }
762#endif
763
764}
765
766/*
Randy Dunlapd0d856e2006-10-11 01:21:07 -0700767 * ext4_ext_binsearch:
768 * binary search for closest extent of the given block
Alex Tomasc29c0ae2007-07-18 09:19:09 -0400769 * the header must be checked before calling this
Alex Tomasa86c6182006-10-11 01:21:03 -0700770 */
771static void
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -0500772ext4_ext_binsearch(struct inode *inode,
773 struct ext4_ext_path *path, ext4_lblk_t block)
Alex Tomasa86c6182006-10-11 01:21:03 -0700774{
775 struct ext4_extent_header *eh = path->p_hdr;
776 struct ext4_extent *r, *l, *m;
777
Alex Tomasa86c6182006-10-11 01:21:03 -0700778 if (eh->eh_entries == 0) {
779 /*
Randy Dunlapd0d856e2006-10-11 01:21:07 -0700780 * this leaf is empty:
781 * we get such a leaf in split/add case
Alex Tomasa86c6182006-10-11 01:21:03 -0700782 */
783 return;
784 }
785
Eric Sandeenbba90742008-01-28 23:58:27 -0500786 ext_debug("binsearch for %u: ", block);
Alex Tomasa86c6182006-10-11 01:21:03 -0700787
788 l = EXT_FIRST_EXTENT(eh) + 1;
Dmitry Monakhove9f410b2007-07-18 09:09:15 -0400789 r = EXT_LAST_EXTENT(eh);
Alex Tomasa86c6182006-10-11 01:21:03 -0700790
791 while (l <= r) {
792 m = l + (r - l) / 2;
793 if (block < le32_to_cpu(m->ee_block))
794 r = m - 1;
795 else
796 l = m + 1;
Dmitry Monakhov26d535e2007-07-18 08:33:37 -0400797 ext_debug("%p(%u):%p(%u):%p(%u) ", l, le32_to_cpu(l->ee_block),
798 m, le32_to_cpu(m->ee_block),
799 r, le32_to_cpu(r->ee_block));
Alex Tomasa86c6182006-10-11 01:21:03 -0700800 }
801
802 path->p_ext = l - 1;
Mingming553f9002009-09-18 13:34:55 -0400803 ext_debug(" -> %d:%llu:[%d]%d ",
Dave Kleikamp8c55e202007-05-24 13:04:54 -0400804 le32_to_cpu(path->p_ext->ee_block),
Theodore Ts'obf89d162010-10-27 21:30:14 -0400805 ext4_ext_pblock(path->p_ext),
Lukas Czerner556615d2014-04-20 23:45:47 -0400806 ext4_ext_is_unwritten(path->p_ext),
Amit Aroraa2df2a62007-07-17 21:42:41 -0400807 ext4_ext_get_actual_len(path->p_ext));
Alex Tomasa86c6182006-10-11 01:21:03 -0700808
809#ifdef CHECK_BINSEARCH
810 {
811 struct ext4_extent *chex, *ex;
812 int k;
813
814 chex = ex = EXT_FIRST_EXTENT(eh);
815 for (k = 0; k < le16_to_cpu(eh->eh_entries); k++, ex++) {
816 BUG_ON(k && le32_to_cpu(ex->ee_block)
Dave Kleikamp8c55e202007-05-24 13:04:54 -0400817 <= le32_to_cpu(ex[-1].ee_block));
Alex Tomasa86c6182006-10-11 01:21:03 -0700818 if (block < le32_to_cpu(ex->ee_block))
819 break;
820 chex = ex;
821 }
822 BUG_ON(chex != path->p_ext);
823 }
824#endif
825
826}
827
828int ext4_ext_tree_init(handle_t *handle, struct inode *inode)
829{
830 struct ext4_extent_header *eh;
831
832 eh = ext_inode_hdr(inode);
833 eh->eh_depth = 0;
834 eh->eh_entries = 0;
835 eh->eh_magic = EXT4_EXT_MAGIC;
Theodore Ts'o55ad63b2009-08-28 10:40:33 -0400836 eh->eh_max = cpu_to_le16(ext4_ext_space_root(inode, 0));
Alex Tomasa86c6182006-10-11 01:21:03 -0700837 ext4_mark_inode_dirty(handle, inode);
Alex Tomasa86c6182006-10-11 01:21:03 -0700838 return 0;
839}
840
841struct ext4_ext_path *
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -0500842ext4_ext_find_extent(struct inode *inode, ext4_lblk_t block,
Theodore Ts'o107a7bd2013-08-16 21:23:41 -0400843 struct ext4_ext_path *path, int flags)
Alex Tomasa86c6182006-10-11 01:21:03 -0700844{
845 struct ext4_extent_header *eh;
846 struct buffer_head *bh;
847 short int depth, i, ppos = 0, alloc = 0;
Theodore Ts'o860d21e2013-01-12 16:19:36 -0500848 int ret;
Alex Tomasa86c6182006-10-11 01:21:03 -0700849
850 eh = ext_inode_hdr(inode);
Alex Tomasc29c0ae2007-07-18 09:19:09 -0400851 depth = ext_depth(inode);
Alex Tomasa86c6182006-10-11 01:21:03 -0700852
853 /* account possible depth increase */
854 if (!path) {
Avantika Mathur5d4958f2006-12-06 20:41:35 -0800855 path = kzalloc(sizeof(struct ext4_ext_path) * (depth + 2),
Alex Tomasa86c6182006-10-11 01:21:03 -0700856 GFP_NOFS);
857 if (!path)
858 return ERR_PTR(-ENOMEM);
859 alloc = 1;
860 }
Alex Tomasa86c6182006-10-11 01:21:03 -0700861 path[0].p_hdr = eh;
Shen Feng1973adc2008-07-11 19:27:31 -0400862 path[0].p_bh = NULL;
Alex Tomasa86c6182006-10-11 01:21:03 -0700863
Alex Tomasc29c0ae2007-07-18 09:19:09 -0400864 i = depth;
Alex Tomasa86c6182006-10-11 01:21:03 -0700865 /* walk through the tree */
866 while (i) {
867 ext_debug("depth %d: num %d, max %d\n",
868 ppos, le16_to_cpu(eh->eh_entries), le16_to_cpu(eh->eh_max));
Alex Tomasc29c0ae2007-07-18 09:19:09 -0400869
Alex Tomasa86c6182006-10-11 01:21:03 -0700870 ext4_ext_binsearch_idx(inode, path + ppos, block);
Theodore Ts'obf89d162010-10-27 21:30:14 -0400871 path[ppos].p_block = ext4_idx_pblock(path[ppos].p_idx);
Alex Tomasa86c6182006-10-11 01:21:03 -0700872 path[ppos].p_depth = i;
873 path[ppos].p_ext = NULL;
874
Theodore Ts'o107a7bd2013-08-16 21:23:41 -0400875 bh = read_extent_tree_block(inode, path[ppos].p_block, --i,
876 flags);
Theodore Ts'o7d7ea892013-08-16 21:20:41 -0400877 if (IS_ERR(bh)) {
878 ret = PTR_ERR(bh);
Alex Tomasa86c6182006-10-11 01:21:03 -0700879 goto err;
Theodore Ts'o860d21e2013-01-12 16:19:36 -0500880 }
Theodore Ts'o7d7ea892013-08-16 21:20:41 -0400881
Alex Tomasa86c6182006-10-11 01:21:03 -0700882 eh = ext_block_hdr(bh);
883 ppos++;
Frank Mayhar273df552010-03-02 11:46:09 -0500884 if (unlikely(ppos > depth)) {
885 put_bh(bh);
886 EXT4_ERROR_INODE(inode,
887 "ppos %d > depth %d", ppos, depth);
Theodore Ts'o860d21e2013-01-12 16:19:36 -0500888 ret = -EIO;
Frank Mayhar273df552010-03-02 11:46:09 -0500889 goto err;
890 }
Alex Tomasa86c6182006-10-11 01:21:03 -0700891 path[ppos].p_bh = bh;
892 path[ppos].p_hdr = eh;
Alex Tomasa86c6182006-10-11 01:21:03 -0700893 }
894
895 path[ppos].p_depth = i;
Alex Tomasa86c6182006-10-11 01:21:03 -0700896 path[ppos].p_ext = NULL;
897 path[ppos].p_idx = NULL;
898
Alex Tomasa86c6182006-10-11 01:21:03 -0700899 /* find extent */
900 ext4_ext_binsearch(inode, path + ppos, block);
Shen Feng1973adc2008-07-11 19:27:31 -0400901 /* if not an empty leaf */
902 if (path[ppos].p_ext)
Theodore Ts'obf89d162010-10-27 21:30:14 -0400903 path[ppos].p_block = ext4_ext_pblock(path[ppos].p_ext);
Alex Tomasa86c6182006-10-11 01:21:03 -0700904
905 ext4_ext_show_path(inode, path);
906
907 return path;
908
909err:
910 ext4_ext_drop_refs(path);
911 if (alloc)
912 kfree(path);
Theodore Ts'o860d21e2013-01-12 16:19:36 -0500913 return ERR_PTR(ret);
Alex Tomasa86c6182006-10-11 01:21:03 -0700914}
915
916/*
Randy Dunlapd0d856e2006-10-11 01:21:07 -0700917 * ext4_ext_insert_index:
918 * insert new index [@logical;@ptr] into the block at @curp;
919 * check where to insert: before @curp or after @curp
Alex Tomasa86c6182006-10-11 01:21:03 -0700920 */
Theodore Ts'o1f109d52010-10-27 21:30:14 -0400921static int ext4_ext_insert_index(handle_t *handle, struct inode *inode,
922 struct ext4_ext_path *curp,
923 int logical, ext4_fsblk_t ptr)
Alex Tomasa86c6182006-10-11 01:21:03 -0700924{
925 struct ext4_extent_idx *ix;
926 int len, err;
927
Avantika Mathur7e028972006-12-06 20:41:33 -0800928 err = ext4_ext_get_access(handle, inode, curp);
929 if (err)
Alex Tomasa86c6182006-10-11 01:21:03 -0700930 return err;
931
Frank Mayhar273df552010-03-02 11:46:09 -0500932 if (unlikely(logical == le32_to_cpu(curp->p_idx->ei_block))) {
933 EXT4_ERROR_INODE(inode,
934 "logical %d == ei_block %d!",
935 logical, le32_to_cpu(curp->p_idx->ei_block));
936 return -EIO;
937 }
Robin Dongd4620312011-07-17 23:43:42 -0400938
939 if (unlikely(le16_to_cpu(curp->p_hdr->eh_entries)
940 >= le16_to_cpu(curp->p_hdr->eh_max))) {
941 EXT4_ERROR_INODE(inode,
942 "eh_entries %d >= eh_max %d!",
943 le16_to_cpu(curp->p_hdr->eh_entries),
944 le16_to_cpu(curp->p_hdr->eh_max));
945 return -EIO;
946 }
947
Alex Tomasa86c6182006-10-11 01:21:03 -0700948 if (logical > le32_to_cpu(curp->p_idx->ei_block)) {
949 /* insert after */
Eric Gouriou80e675f2011-10-27 11:52:18 -0400950 ext_debug("insert new index %d after: %llu\n", logical, ptr);
Alex Tomasa86c6182006-10-11 01:21:03 -0700951 ix = curp->p_idx + 1;
952 } else {
953 /* insert before */
Eric Gouriou80e675f2011-10-27 11:52:18 -0400954 ext_debug("insert new index %d before: %llu\n", logical, ptr);
Alex Tomasa86c6182006-10-11 01:21:03 -0700955 ix = curp->p_idx;
956 }
957
Eric Gouriou80e675f2011-10-27 11:52:18 -0400958 len = EXT_LAST_INDEX(curp->p_hdr) - ix + 1;
959 BUG_ON(len < 0);
960 if (len > 0) {
961 ext_debug("insert new index %d: "
962 "move %d indices from 0x%p to 0x%p\n",
963 logical, len, ix, ix + 1);
964 memmove(ix + 1, ix, len * sizeof(struct ext4_extent_idx));
965 }
966
Tao Maf472e022011-10-17 10:13:46 -0400967 if (unlikely(ix > EXT_MAX_INDEX(curp->p_hdr))) {
968 EXT4_ERROR_INODE(inode, "ix > EXT_MAX_INDEX!");
969 return -EIO;
970 }
971
Alex Tomasa86c6182006-10-11 01:21:03 -0700972 ix->ei_block = cpu_to_le32(logical);
Alex Tomasf65e6fb2006-10-11 01:21:05 -0700973 ext4_idx_store_pblock(ix, ptr);
Marcin Slusarze8546d02008-04-17 10:38:59 -0400974 le16_add_cpu(&curp->p_hdr->eh_entries, 1);
Alex Tomasa86c6182006-10-11 01:21:03 -0700975
Frank Mayhar273df552010-03-02 11:46:09 -0500976 if (unlikely(ix > EXT_LAST_INDEX(curp->p_hdr))) {
977 EXT4_ERROR_INODE(inode, "ix > EXT_LAST_INDEX!");
978 return -EIO;
979 }
Alex Tomasa86c6182006-10-11 01:21:03 -0700980
981 err = ext4_ext_dirty(handle, inode, curp);
982 ext4_std_error(inode->i_sb, err);
983
984 return err;
985}
986
987/*
Randy Dunlapd0d856e2006-10-11 01:21:07 -0700988 * ext4_ext_split:
989 * inserts new subtree into the path, using free index entry
990 * at depth @at:
991 * - allocates all needed blocks (new leaf and all intermediate index blocks)
992 * - makes decision where to split
993 * - moves remaining extents and index entries (right to the split point)
994 * into the newly allocated blocks
995 * - initializes subtree
Alex Tomasa86c6182006-10-11 01:21:03 -0700996 */
997static int ext4_ext_split(handle_t *handle, struct inode *inode,
Allison Henderson55f020d2011-05-25 07:41:26 -0400998 unsigned int flags,
999 struct ext4_ext_path *path,
1000 struct ext4_extent *newext, int at)
Alex Tomasa86c6182006-10-11 01:21:03 -07001001{
1002 struct buffer_head *bh = NULL;
1003 int depth = ext_depth(inode);
1004 struct ext4_extent_header *neh;
1005 struct ext4_extent_idx *fidx;
Alex Tomasa86c6182006-10-11 01:21:03 -07001006 int i = at, k, m, a;
Alex Tomasf65e6fb2006-10-11 01:21:05 -07001007 ext4_fsblk_t newblock, oldblock;
Alex Tomasa86c6182006-10-11 01:21:03 -07001008 __le32 border;
Alex Tomasf65e6fb2006-10-11 01:21:05 -07001009 ext4_fsblk_t *ablocks = NULL; /* array of allocated blocks */
Alex Tomasa86c6182006-10-11 01:21:03 -07001010 int err = 0;
1011
1012 /* make decision: where to split? */
Randy Dunlapd0d856e2006-10-11 01:21:07 -07001013 /* FIXME: now decision is simplest: at current extent */
Alex Tomasa86c6182006-10-11 01:21:03 -07001014
Randy Dunlapd0d856e2006-10-11 01:21:07 -07001015 /* if current leaf will be split, then we should use
Alex Tomasa86c6182006-10-11 01:21:03 -07001016 * border from split point */
Frank Mayhar273df552010-03-02 11:46:09 -05001017 if (unlikely(path[depth].p_ext > EXT_MAX_EXTENT(path[depth].p_hdr))) {
1018 EXT4_ERROR_INODE(inode, "p_ext > EXT_MAX_EXTENT!");
1019 return -EIO;
1020 }
Alex Tomasa86c6182006-10-11 01:21:03 -07001021 if (path[depth].p_ext != EXT_MAX_EXTENT(path[depth].p_hdr)) {
1022 border = path[depth].p_ext[1].ee_block;
Randy Dunlapd0d856e2006-10-11 01:21:07 -07001023 ext_debug("leaf will be split."
Alex Tomasa86c6182006-10-11 01:21:03 -07001024 " next leaf starts at %d\n",
Dave Kleikamp8c55e202007-05-24 13:04:54 -04001025 le32_to_cpu(border));
Alex Tomasa86c6182006-10-11 01:21:03 -07001026 } else {
1027 border = newext->ee_block;
1028 ext_debug("leaf will be added."
1029 " next leaf starts at %d\n",
Dave Kleikamp8c55e202007-05-24 13:04:54 -04001030 le32_to_cpu(border));
Alex Tomasa86c6182006-10-11 01:21:03 -07001031 }
1032
1033 /*
Randy Dunlapd0d856e2006-10-11 01:21:07 -07001034 * If error occurs, then we break processing
1035 * and mark filesystem read-only. index won't
Alex Tomasa86c6182006-10-11 01:21:03 -07001036 * be inserted and tree will be in consistent
Randy Dunlapd0d856e2006-10-11 01:21:07 -07001037 * state. Next mount will repair buffers too.
Alex Tomasa86c6182006-10-11 01:21:03 -07001038 */
1039
1040 /*
Randy Dunlapd0d856e2006-10-11 01:21:07 -07001041 * Get array to track all allocated blocks.
1042 * We need this to handle errors and free blocks
1043 * upon them.
Alex Tomasa86c6182006-10-11 01:21:03 -07001044 */
Avantika Mathur5d4958f2006-12-06 20:41:35 -08001045 ablocks = kzalloc(sizeof(ext4_fsblk_t) * depth, GFP_NOFS);
Alex Tomasa86c6182006-10-11 01:21:03 -07001046 if (!ablocks)
1047 return -ENOMEM;
Alex Tomasa86c6182006-10-11 01:21:03 -07001048
1049 /* allocate all needed blocks */
1050 ext_debug("allocate %d blocks for indexes/leaf\n", depth - at);
1051 for (a = 0; a < depth - at; a++) {
Aneesh Kumar K.V654b4902008-07-11 19:27:31 -04001052 newblock = ext4_ext_new_meta_block(handle, inode, path,
Allison Henderson55f020d2011-05-25 07:41:26 -04001053 newext, &err, flags);
Alex Tomasa86c6182006-10-11 01:21:03 -07001054 if (newblock == 0)
1055 goto cleanup;
1056 ablocks[a] = newblock;
1057 }
1058
1059 /* initialize new leaf */
1060 newblock = ablocks[--a];
Frank Mayhar273df552010-03-02 11:46:09 -05001061 if (unlikely(newblock == 0)) {
1062 EXT4_ERROR_INODE(inode, "newblock == 0!");
1063 err = -EIO;
1064 goto cleanup;
1065 }
Alex Tomasa86c6182006-10-11 01:21:03 -07001066 bh = sb_getblk(inode->i_sb, newblock);
Wang Shilongaebf0242013-01-12 16:28:47 -05001067 if (unlikely(!bh)) {
Theodore Ts'o860d21e2013-01-12 16:19:36 -05001068 err = -ENOMEM;
Alex Tomasa86c6182006-10-11 01:21:03 -07001069 goto cleanup;
1070 }
1071 lock_buffer(bh);
1072
Avantika Mathur7e028972006-12-06 20:41:33 -08001073 err = ext4_journal_get_create_access(handle, bh);
1074 if (err)
Alex Tomasa86c6182006-10-11 01:21:03 -07001075 goto cleanup;
1076
1077 neh = ext_block_hdr(bh);
1078 neh->eh_entries = 0;
Theodore Ts'o55ad63b2009-08-28 10:40:33 -04001079 neh->eh_max = cpu_to_le16(ext4_ext_space_block(inode, 0));
Alex Tomasa86c6182006-10-11 01:21:03 -07001080 neh->eh_magic = EXT4_EXT_MAGIC;
1081 neh->eh_depth = 0;
Alex Tomasa86c6182006-10-11 01:21:03 -07001082
Randy Dunlapd0d856e2006-10-11 01:21:07 -07001083 /* move remainder of path[depth] to the new leaf */
Frank Mayhar273df552010-03-02 11:46:09 -05001084 if (unlikely(path[depth].p_hdr->eh_entries !=
1085 path[depth].p_hdr->eh_max)) {
1086 EXT4_ERROR_INODE(inode, "eh_entries %d != eh_max %d!",
1087 path[depth].p_hdr->eh_entries,
1088 path[depth].p_hdr->eh_max);
1089 err = -EIO;
1090 goto cleanup;
1091 }
Alex Tomasa86c6182006-10-11 01:21:03 -07001092 /* start copy from next extent */
Yongqiang Yang1b16da72011-05-25 17:41:48 -04001093 m = EXT_MAX_EXTENT(path[depth].p_hdr) - path[depth].p_ext++;
1094 ext4_ext_show_move(inode, path, newblock, depth);
Alex Tomasa86c6182006-10-11 01:21:03 -07001095 if (m) {
Yongqiang Yang1b16da72011-05-25 17:41:48 -04001096 struct ext4_extent *ex;
1097 ex = EXT_FIRST_EXTENT(neh);
1098 memmove(ex, path[depth].p_ext, sizeof(struct ext4_extent) * m);
Marcin Slusarze8546d02008-04-17 10:38:59 -04001099 le16_add_cpu(&neh->eh_entries, m);
Alex Tomasa86c6182006-10-11 01:21:03 -07001100 }
1101
Darrick J. Wong7ac59902012-04-29 18:37:10 -04001102 ext4_extent_block_csum_set(inode, neh);
Alex Tomasa86c6182006-10-11 01:21:03 -07001103 set_buffer_uptodate(bh);
1104 unlock_buffer(bh);
1105
Frank Mayhar03901312009-01-07 00:06:22 -05001106 err = ext4_handle_dirty_metadata(handle, inode, bh);
Avantika Mathur7e028972006-12-06 20:41:33 -08001107 if (err)
Alex Tomasa86c6182006-10-11 01:21:03 -07001108 goto cleanup;
1109 brelse(bh);
1110 bh = NULL;
1111
1112 /* correct old leaf */
1113 if (m) {
Avantika Mathur7e028972006-12-06 20:41:33 -08001114 err = ext4_ext_get_access(handle, inode, path + depth);
1115 if (err)
Alex Tomasa86c6182006-10-11 01:21:03 -07001116 goto cleanup;
Marcin Slusarze8546d02008-04-17 10:38:59 -04001117 le16_add_cpu(&path[depth].p_hdr->eh_entries, -m);
Avantika Mathur7e028972006-12-06 20:41:33 -08001118 err = ext4_ext_dirty(handle, inode, path + depth);
1119 if (err)
Alex Tomasa86c6182006-10-11 01:21:03 -07001120 goto cleanup;
1121
1122 }
1123
1124 /* create intermediate indexes */
1125 k = depth - at - 1;
Frank Mayhar273df552010-03-02 11:46:09 -05001126 if (unlikely(k < 0)) {
1127 EXT4_ERROR_INODE(inode, "k %d < 0!", k);
1128 err = -EIO;
1129 goto cleanup;
1130 }
Alex Tomasa86c6182006-10-11 01:21:03 -07001131 if (k)
1132 ext_debug("create %d intermediate indices\n", k);
1133 /* insert new index into current index block */
1134 /* current depth stored in i var */
1135 i = depth - 1;
1136 while (k--) {
1137 oldblock = newblock;
1138 newblock = ablocks[--a];
Eric Sandeenbba90742008-01-28 23:58:27 -05001139 bh = sb_getblk(inode->i_sb, newblock);
Wang Shilongaebf0242013-01-12 16:28:47 -05001140 if (unlikely(!bh)) {
Theodore Ts'o860d21e2013-01-12 16:19:36 -05001141 err = -ENOMEM;
Alex Tomasa86c6182006-10-11 01:21:03 -07001142 goto cleanup;
1143 }
1144 lock_buffer(bh);
1145
Avantika Mathur7e028972006-12-06 20:41:33 -08001146 err = ext4_journal_get_create_access(handle, bh);
1147 if (err)
Alex Tomasa86c6182006-10-11 01:21:03 -07001148 goto cleanup;
1149
1150 neh = ext_block_hdr(bh);
1151 neh->eh_entries = cpu_to_le16(1);
1152 neh->eh_magic = EXT4_EXT_MAGIC;
Theodore Ts'o55ad63b2009-08-28 10:40:33 -04001153 neh->eh_max = cpu_to_le16(ext4_ext_space_block_idx(inode, 0));
Alex Tomasa86c6182006-10-11 01:21:03 -07001154 neh->eh_depth = cpu_to_le16(depth - i);
1155 fidx = EXT_FIRST_INDEX(neh);
1156 fidx->ei_block = border;
Alex Tomasf65e6fb2006-10-11 01:21:05 -07001157 ext4_idx_store_pblock(fidx, oldblock);
Alex Tomasa86c6182006-10-11 01:21:03 -07001158
Eric Sandeenbba90742008-01-28 23:58:27 -05001159 ext_debug("int.index at %d (block %llu): %u -> %llu\n",
1160 i, newblock, le32_to_cpu(border), oldblock);
Alex Tomasa86c6182006-10-11 01:21:03 -07001161
Yongqiang Yang1b16da72011-05-25 17:41:48 -04001162 /* move remainder of path[i] to the new index block */
Frank Mayhar273df552010-03-02 11:46:09 -05001163 if (unlikely(EXT_MAX_INDEX(path[i].p_hdr) !=
1164 EXT_LAST_INDEX(path[i].p_hdr))) {
1165 EXT4_ERROR_INODE(inode,
1166 "EXT_MAX_INDEX != EXT_LAST_INDEX ee_block %d!",
1167 le32_to_cpu(path[i].p_ext->ee_block));
1168 err = -EIO;
1169 goto cleanup;
1170 }
Yongqiang Yang1b16da72011-05-25 17:41:48 -04001171 /* start copy indexes */
1172 m = EXT_MAX_INDEX(path[i].p_hdr) - path[i].p_idx++;
1173 ext_debug("cur 0x%p, last 0x%p\n", path[i].p_idx,
1174 EXT_MAX_INDEX(path[i].p_hdr));
1175 ext4_ext_show_move(inode, path, newblock, i);
Alex Tomasa86c6182006-10-11 01:21:03 -07001176 if (m) {
Yongqiang Yang1b16da72011-05-25 17:41:48 -04001177 memmove(++fidx, path[i].p_idx,
Alex Tomasa86c6182006-10-11 01:21:03 -07001178 sizeof(struct ext4_extent_idx) * m);
Marcin Slusarze8546d02008-04-17 10:38:59 -04001179 le16_add_cpu(&neh->eh_entries, m);
Alex Tomasa86c6182006-10-11 01:21:03 -07001180 }
Darrick J. Wong7ac59902012-04-29 18:37:10 -04001181 ext4_extent_block_csum_set(inode, neh);
Alex Tomasa86c6182006-10-11 01:21:03 -07001182 set_buffer_uptodate(bh);
1183 unlock_buffer(bh);
1184
Frank Mayhar03901312009-01-07 00:06:22 -05001185 err = ext4_handle_dirty_metadata(handle, inode, bh);
Avantika Mathur7e028972006-12-06 20:41:33 -08001186 if (err)
Alex Tomasa86c6182006-10-11 01:21:03 -07001187 goto cleanup;
1188 brelse(bh);
1189 bh = NULL;
1190
1191 /* correct old index */
1192 if (m) {
1193 err = ext4_ext_get_access(handle, inode, path + i);
1194 if (err)
1195 goto cleanup;
Marcin Slusarze8546d02008-04-17 10:38:59 -04001196 le16_add_cpu(&path[i].p_hdr->eh_entries, -m);
Alex Tomasa86c6182006-10-11 01:21:03 -07001197 err = ext4_ext_dirty(handle, inode, path + i);
1198 if (err)
1199 goto cleanup;
1200 }
1201
1202 i--;
1203 }
1204
1205 /* insert new index */
Alex Tomasa86c6182006-10-11 01:21:03 -07001206 err = ext4_ext_insert_index(handle, inode, path + at,
1207 le32_to_cpu(border), newblock);
1208
1209cleanup:
1210 if (bh) {
1211 if (buffer_locked(bh))
1212 unlock_buffer(bh);
1213 brelse(bh);
1214 }
1215
1216 if (err) {
1217 /* free all allocated blocks in error case */
1218 for (i = 0; i < depth; i++) {
1219 if (!ablocks[i])
1220 continue;
Peter Huewe7dc57612011-02-21 21:01:42 -05001221 ext4_free_blocks(handle, inode, NULL, ablocks[i], 1,
Theodore Ts'oe6362602009-11-23 07:17:05 -05001222 EXT4_FREE_BLOCKS_METADATA);
Alex Tomasa86c6182006-10-11 01:21:03 -07001223 }
1224 }
1225 kfree(ablocks);
1226
1227 return err;
1228}
1229
1230/*
Randy Dunlapd0d856e2006-10-11 01:21:07 -07001231 * ext4_ext_grow_indepth:
1232 * implements tree growing procedure:
1233 * - allocates new block
1234 * - moves top-level data (index block or leaf) into the new block
1235 * - initializes new top-level, creating index that points to the
1236 * just created block
Alex Tomasa86c6182006-10-11 01:21:03 -07001237 */
1238static int ext4_ext_grow_indepth(handle_t *handle, struct inode *inode,
Allison Henderson55f020d2011-05-25 07:41:26 -04001239 unsigned int flags,
Allison Henderson55f020d2011-05-25 07:41:26 -04001240 struct ext4_extent *newext)
Alex Tomasa86c6182006-10-11 01:21:03 -07001241{
Alex Tomasa86c6182006-10-11 01:21:03 -07001242 struct ext4_extent_header *neh;
Alex Tomasa86c6182006-10-11 01:21:03 -07001243 struct buffer_head *bh;
Alex Tomasf65e6fb2006-10-11 01:21:05 -07001244 ext4_fsblk_t newblock;
Alex Tomasa86c6182006-10-11 01:21:03 -07001245 int err = 0;
1246
Dmitry Monakhov1939dd82011-10-22 01:26:05 -04001247 newblock = ext4_ext_new_meta_block(handle, inode, NULL,
Allison Henderson55f020d2011-05-25 07:41:26 -04001248 newext, &err, flags);
Alex Tomasa86c6182006-10-11 01:21:03 -07001249 if (newblock == 0)
1250 return err;
1251
1252 bh = sb_getblk(inode->i_sb, newblock);
Wang Shilongaebf0242013-01-12 16:28:47 -05001253 if (unlikely(!bh))
Theodore Ts'o860d21e2013-01-12 16:19:36 -05001254 return -ENOMEM;
Alex Tomasa86c6182006-10-11 01:21:03 -07001255 lock_buffer(bh);
1256
Avantika Mathur7e028972006-12-06 20:41:33 -08001257 err = ext4_journal_get_create_access(handle, bh);
1258 if (err) {
Alex Tomasa86c6182006-10-11 01:21:03 -07001259 unlock_buffer(bh);
1260 goto out;
1261 }
1262
1263 /* move top-level index/leaf into new block */
Dmitry Monakhov1939dd82011-10-22 01:26:05 -04001264 memmove(bh->b_data, EXT4_I(inode)->i_data,
1265 sizeof(EXT4_I(inode)->i_data));
Alex Tomasa86c6182006-10-11 01:21:03 -07001266
1267 /* set size of new block */
1268 neh = ext_block_hdr(bh);
1269 /* old root could have indexes or leaves
1270 * so calculate e_max right way */
1271 if (ext_depth(inode))
Theodore Ts'o55ad63b2009-08-28 10:40:33 -04001272 neh->eh_max = cpu_to_le16(ext4_ext_space_block_idx(inode, 0));
Alex Tomasa86c6182006-10-11 01:21:03 -07001273 else
Theodore Ts'o55ad63b2009-08-28 10:40:33 -04001274 neh->eh_max = cpu_to_le16(ext4_ext_space_block(inode, 0));
Alex Tomasa86c6182006-10-11 01:21:03 -07001275 neh->eh_magic = EXT4_EXT_MAGIC;
Darrick J. Wong7ac59902012-04-29 18:37:10 -04001276 ext4_extent_block_csum_set(inode, neh);
Alex Tomasa86c6182006-10-11 01:21:03 -07001277 set_buffer_uptodate(bh);
1278 unlock_buffer(bh);
1279
Frank Mayhar03901312009-01-07 00:06:22 -05001280 err = ext4_handle_dirty_metadata(handle, inode, bh);
Avantika Mathur7e028972006-12-06 20:41:33 -08001281 if (err)
Alex Tomasa86c6182006-10-11 01:21:03 -07001282 goto out;
1283
Dmitry Monakhov1939dd82011-10-22 01:26:05 -04001284 /* Update top-level index: num,max,pointer */
Alex Tomasa86c6182006-10-11 01:21:03 -07001285 neh = ext_inode_hdr(inode);
Dmitry Monakhov1939dd82011-10-22 01:26:05 -04001286 neh->eh_entries = cpu_to_le16(1);
1287 ext4_idx_store_pblock(EXT_FIRST_INDEX(neh), newblock);
1288 if (neh->eh_depth == 0) {
1289 /* Root extent block becomes index block */
1290 neh->eh_max = cpu_to_le16(ext4_ext_space_root_idx(inode, 0));
1291 EXT_FIRST_INDEX(neh)->ei_block =
1292 EXT_FIRST_EXTENT(neh)->ee_block;
1293 }
Mingming Cao2ae02102006-10-11 01:21:11 -07001294 ext_debug("new root: num %d(%d), lblock %d, ptr %llu\n",
Alex Tomasa86c6182006-10-11 01:21:03 -07001295 le16_to_cpu(neh->eh_entries), le16_to_cpu(neh->eh_max),
Andi Kleen5a0790c2010-06-14 13:28:03 -04001296 le32_to_cpu(EXT_FIRST_INDEX(neh)->ei_block),
Theodore Ts'obf89d162010-10-27 21:30:14 -04001297 ext4_idx_pblock(EXT_FIRST_INDEX(neh)));
Alex Tomasa86c6182006-10-11 01:21:03 -07001298
Wei Yongjunba39ebb2012-09-27 09:37:53 -04001299 le16_add_cpu(&neh->eh_depth, 1);
Dmitry Monakhov1939dd82011-10-22 01:26:05 -04001300 ext4_mark_inode_dirty(handle, inode);
Alex Tomasa86c6182006-10-11 01:21:03 -07001301out:
1302 brelse(bh);
1303
1304 return err;
1305}
1306
1307/*
Randy Dunlapd0d856e2006-10-11 01:21:07 -07001308 * ext4_ext_create_new_leaf:
1309 * finds empty index and adds new leaf.
1310 * if no free index is found, then it requests in-depth growing.
Alex Tomasa86c6182006-10-11 01:21:03 -07001311 */
1312static int ext4_ext_create_new_leaf(handle_t *handle, struct inode *inode,
Theodore Ts'o107a7bd2013-08-16 21:23:41 -04001313 unsigned int mb_flags,
1314 unsigned int gb_flags,
Allison Henderson55f020d2011-05-25 07:41:26 -04001315 struct ext4_ext_path *path,
1316 struct ext4_extent *newext)
Alex Tomasa86c6182006-10-11 01:21:03 -07001317{
1318 struct ext4_ext_path *curp;
1319 int depth, i, err = 0;
1320
1321repeat:
1322 i = depth = ext_depth(inode);
1323
1324 /* walk up to the tree and look for free index entry */
1325 curp = path + depth;
1326 while (i > 0 && !EXT_HAS_FREE_INDEX(curp)) {
1327 i--;
1328 curp--;
1329 }
1330
Randy Dunlapd0d856e2006-10-11 01:21:07 -07001331 /* we use already allocated block for index block,
1332 * so subsequent data blocks should be contiguous */
Alex Tomasa86c6182006-10-11 01:21:03 -07001333 if (EXT_HAS_FREE_INDEX(curp)) {
1334 /* if we found index with free entry, then use that
1335 * entry: create all needed subtree and add new leaf */
Theodore Ts'o107a7bd2013-08-16 21:23:41 -04001336 err = ext4_ext_split(handle, inode, mb_flags, path, newext, i);
Shen Feng787e0982008-07-11 19:27:31 -04001337 if (err)
1338 goto out;
Alex Tomasa86c6182006-10-11 01:21:03 -07001339
1340 /* refill path */
1341 ext4_ext_drop_refs(path);
1342 path = ext4_ext_find_extent(inode,
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05001343 (ext4_lblk_t)le32_to_cpu(newext->ee_block),
Theodore Ts'o107a7bd2013-08-16 21:23:41 -04001344 path, gb_flags);
Alex Tomasa86c6182006-10-11 01:21:03 -07001345 if (IS_ERR(path))
1346 err = PTR_ERR(path);
1347 } else {
1348 /* tree is full, time to grow in depth */
Theodore Ts'o107a7bd2013-08-16 21:23:41 -04001349 err = ext4_ext_grow_indepth(handle, inode, mb_flags, newext);
Alex Tomasa86c6182006-10-11 01:21:03 -07001350 if (err)
1351 goto out;
1352
1353 /* refill path */
1354 ext4_ext_drop_refs(path);
1355 path = ext4_ext_find_extent(inode,
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05001356 (ext4_lblk_t)le32_to_cpu(newext->ee_block),
Theodore Ts'o107a7bd2013-08-16 21:23:41 -04001357 path, gb_flags);
Alex Tomasa86c6182006-10-11 01:21:03 -07001358 if (IS_ERR(path)) {
1359 err = PTR_ERR(path);
1360 goto out;
1361 }
1362
1363 /*
Randy Dunlapd0d856e2006-10-11 01:21:07 -07001364 * only first (depth 0 -> 1) produces free space;
1365 * in all other cases we have to split the grown tree
Alex Tomasa86c6182006-10-11 01:21:03 -07001366 */
1367 depth = ext_depth(inode);
1368 if (path[depth].p_hdr->eh_entries == path[depth].p_hdr->eh_max) {
Randy Dunlapd0d856e2006-10-11 01:21:07 -07001369 /* now we need to split */
Alex Tomasa86c6182006-10-11 01:21:03 -07001370 goto repeat;
1371 }
1372 }
1373
1374out:
1375 return err;
1376}
1377
1378/*
Alex Tomas1988b512008-01-28 23:58:27 -05001379 * search the closest allocated block to the left for *logical
1380 * and returns it at @logical + it's physical address at @phys
1381 * if *logical is the smallest allocated block, the function
1382 * returns 0 at @phys
1383 * return value contains 0 (success) or error code
1384 */
Theodore Ts'o1f109d52010-10-27 21:30:14 -04001385static int ext4_ext_search_left(struct inode *inode,
1386 struct ext4_ext_path *path,
1387 ext4_lblk_t *logical, ext4_fsblk_t *phys)
Alex Tomas1988b512008-01-28 23:58:27 -05001388{
1389 struct ext4_extent_idx *ix;
1390 struct ext4_extent *ex;
Aneesh Kumar K.Vb939e372008-01-28 23:58:27 -05001391 int depth, ee_len;
Alex Tomas1988b512008-01-28 23:58:27 -05001392
Frank Mayhar273df552010-03-02 11:46:09 -05001393 if (unlikely(path == NULL)) {
1394 EXT4_ERROR_INODE(inode, "path == NULL *logical %d!", *logical);
1395 return -EIO;
1396 }
Alex Tomas1988b512008-01-28 23:58:27 -05001397 depth = path->p_depth;
1398 *phys = 0;
1399
1400 if (depth == 0 && path->p_ext == NULL)
1401 return 0;
1402
1403 /* usually extent in the path covers blocks smaller
1404 * then *logical, but it can be that extent is the
1405 * first one in the file */
1406
1407 ex = path[depth].p_ext;
Aneesh Kumar K.Vb939e372008-01-28 23:58:27 -05001408 ee_len = ext4_ext_get_actual_len(ex);
Alex Tomas1988b512008-01-28 23:58:27 -05001409 if (*logical < le32_to_cpu(ex->ee_block)) {
Frank Mayhar273df552010-03-02 11:46:09 -05001410 if (unlikely(EXT_FIRST_EXTENT(path[depth].p_hdr) != ex)) {
1411 EXT4_ERROR_INODE(inode,
1412 "EXT_FIRST_EXTENT != ex *logical %d ee_block %d!",
1413 *logical, le32_to_cpu(ex->ee_block));
1414 return -EIO;
1415 }
Alex Tomas1988b512008-01-28 23:58:27 -05001416 while (--depth >= 0) {
1417 ix = path[depth].p_idx;
Frank Mayhar273df552010-03-02 11:46:09 -05001418 if (unlikely(ix != EXT_FIRST_INDEX(path[depth].p_hdr))) {
1419 EXT4_ERROR_INODE(inode,
1420 "ix (%d) != EXT_FIRST_INDEX (%d) (depth %d)!",
Tao Ma6ee3b212011-10-08 16:08:34 -04001421 ix != NULL ? le32_to_cpu(ix->ei_block) : 0,
Frank Mayhar273df552010-03-02 11:46:09 -05001422 EXT_FIRST_INDEX(path[depth].p_hdr) != NULL ?
Tao Ma6ee3b212011-10-08 16:08:34 -04001423 le32_to_cpu(EXT_FIRST_INDEX(path[depth].p_hdr)->ei_block) : 0,
Frank Mayhar273df552010-03-02 11:46:09 -05001424 depth);
1425 return -EIO;
1426 }
Alex Tomas1988b512008-01-28 23:58:27 -05001427 }
1428 return 0;
1429 }
1430
Frank Mayhar273df552010-03-02 11:46:09 -05001431 if (unlikely(*logical < (le32_to_cpu(ex->ee_block) + ee_len))) {
1432 EXT4_ERROR_INODE(inode,
1433 "logical %d < ee_block %d + ee_len %d!",
1434 *logical, le32_to_cpu(ex->ee_block), ee_len);
1435 return -EIO;
1436 }
Alex Tomas1988b512008-01-28 23:58:27 -05001437
Aneesh Kumar K.Vb939e372008-01-28 23:58:27 -05001438 *logical = le32_to_cpu(ex->ee_block) + ee_len - 1;
Theodore Ts'obf89d162010-10-27 21:30:14 -04001439 *phys = ext4_ext_pblock(ex) + ee_len - 1;
Alex Tomas1988b512008-01-28 23:58:27 -05001440 return 0;
1441}
1442
1443/*
1444 * search the closest allocated block to the right for *logical
1445 * and returns it at @logical + it's physical address at @phys
Tao Madf3ab172011-10-08 15:53:49 -04001446 * if *logical is the largest allocated block, the function
Alex Tomas1988b512008-01-28 23:58:27 -05001447 * returns 0 at @phys
1448 * return value contains 0 (success) or error code
1449 */
Theodore Ts'o1f109d52010-10-27 21:30:14 -04001450static int ext4_ext_search_right(struct inode *inode,
1451 struct ext4_ext_path *path,
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04001452 ext4_lblk_t *logical, ext4_fsblk_t *phys,
1453 struct ext4_extent **ret_ex)
Alex Tomas1988b512008-01-28 23:58:27 -05001454{
1455 struct buffer_head *bh = NULL;
1456 struct ext4_extent_header *eh;
1457 struct ext4_extent_idx *ix;
1458 struct ext4_extent *ex;
1459 ext4_fsblk_t block;
Eric Sandeen395a87b2009-03-10 18:18:47 -04001460 int depth; /* Note, NOT eh_depth; depth from top of tree */
1461 int ee_len;
Alex Tomas1988b512008-01-28 23:58:27 -05001462
Frank Mayhar273df552010-03-02 11:46:09 -05001463 if (unlikely(path == NULL)) {
1464 EXT4_ERROR_INODE(inode, "path == NULL *logical %d!", *logical);
1465 return -EIO;
1466 }
Alex Tomas1988b512008-01-28 23:58:27 -05001467 depth = path->p_depth;
1468 *phys = 0;
1469
1470 if (depth == 0 && path->p_ext == NULL)
1471 return 0;
1472
1473 /* usually extent in the path covers blocks smaller
1474 * then *logical, but it can be that extent is the
1475 * first one in the file */
1476
1477 ex = path[depth].p_ext;
Aneesh Kumar K.Vb939e372008-01-28 23:58:27 -05001478 ee_len = ext4_ext_get_actual_len(ex);
Alex Tomas1988b512008-01-28 23:58:27 -05001479 if (*logical < le32_to_cpu(ex->ee_block)) {
Frank Mayhar273df552010-03-02 11:46:09 -05001480 if (unlikely(EXT_FIRST_EXTENT(path[depth].p_hdr) != ex)) {
1481 EXT4_ERROR_INODE(inode,
1482 "first_extent(path[%d].p_hdr) != ex",
1483 depth);
1484 return -EIO;
1485 }
Alex Tomas1988b512008-01-28 23:58:27 -05001486 while (--depth >= 0) {
1487 ix = path[depth].p_idx;
Frank Mayhar273df552010-03-02 11:46:09 -05001488 if (unlikely(ix != EXT_FIRST_INDEX(path[depth].p_hdr))) {
1489 EXT4_ERROR_INODE(inode,
1490 "ix != EXT_FIRST_INDEX *logical %d!",
1491 *logical);
1492 return -EIO;
1493 }
Alex Tomas1988b512008-01-28 23:58:27 -05001494 }
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04001495 goto found_extent;
Alex Tomas1988b512008-01-28 23:58:27 -05001496 }
1497
Frank Mayhar273df552010-03-02 11:46:09 -05001498 if (unlikely(*logical < (le32_to_cpu(ex->ee_block) + ee_len))) {
1499 EXT4_ERROR_INODE(inode,
1500 "logical %d < ee_block %d + ee_len %d!",
1501 *logical, le32_to_cpu(ex->ee_block), ee_len);
1502 return -EIO;
1503 }
Alex Tomas1988b512008-01-28 23:58:27 -05001504
1505 if (ex != EXT_LAST_EXTENT(path[depth].p_hdr)) {
1506 /* next allocated block in this leaf */
1507 ex++;
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04001508 goto found_extent;
Alex Tomas1988b512008-01-28 23:58:27 -05001509 }
1510
1511 /* go up and search for index to the right */
1512 while (--depth >= 0) {
1513 ix = path[depth].p_idx;
1514 if (ix != EXT_LAST_INDEX(path[depth].p_hdr))
Wu Fengguang25f1ee32008-11-25 17:24:23 -05001515 goto got_index;
Alex Tomas1988b512008-01-28 23:58:27 -05001516 }
1517
Wu Fengguang25f1ee32008-11-25 17:24:23 -05001518 /* we've gone up to the root and found no index to the right */
1519 return 0;
Alex Tomas1988b512008-01-28 23:58:27 -05001520
Wu Fengguang25f1ee32008-11-25 17:24:23 -05001521got_index:
Alex Tomas1988b512008-01-28 23:58:27 -05001522 /* we've found index to the right, let's
1523 * follow it and find the closest allocated
1524 * block to the right */
1525 ix++;
Theodore Ts'obf89d162010-10-27 21:30:14 -04001526 block = ext4_idx_pblock(ix);
Alex Tomas1988b512008-01-28 23:58:27 -05001527 while (++depth < path->p_depth) {
Eric Sandeen395a87b2009-03-10 18:18:47 -04001528 /* subtract from p_depth to get proper eh_depth */
Theodore Ts'o7d7ea892013-08-16 21:20:41 -04001529 bh = read_extent_tree_block(inode, block,
Theodore Ts'o107a7bd2013-08-16 21:23:41 -04001530 path->p_depth - depth, 0);
Theodore Ts'o7d7ea892013-08-16 21:20:41 -04001531 if (IS_ERR(bh))
1532 return PTR_ERR(bh);
1533 eh = ext_block_hdr(bh);
Alex Tomas1988b512008-01-28 23:58:27 -05001534 ix = EXT_FIRST_INDEX(eh);
Theodore Ts'obf89d162010-10-27 21:30:14 -04001535 block = ext4_idx_pblock(ix);
Alex Tomas1988b512008-01-28 23:58:27 -05001536 put_bh(bh);
1537 }
1538
Theodore Ts'o107a7bd2013-08-16 21:23:41 -04001539 bh = read_extent_tree_block(inode, block, path->p_depth - depth, 0);
Theodore Ts'o7d7ea892013-08-16 21:20:41 -04001540 if (IS_ERR(bh))
1541 return PTR_ERR(bh);
Alex Tomas1988b512008-01-28 23:58:27 -05001542 eh = ext_block_hdr(bh);
Alex Tomas1988b512008-01-28 23:58:27 -05001543 ex = EXT_FIRST_EXTENT(eh);
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04001544found_extent:
Alex Tomas1988b512008-01-28 23:58:27 -05001545 *logical = le32_to_cpu(ex->ee_block);
Theodore Ts'obf89d162010-10-27 21:30:14 -04001546 *phys = ext4_ext_pblock(ex);
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04001547 *ret_ex = ex;
1548 if (bh)
1549 put_bh(bh);
Alex Tomas1988b512008-01-28 23:58:27 -05001550 return 0;
Alex Tomas1988b512008-01-28 23:58:27 -05001551}
1552
1553/*
Randy Dunlapd0d856e2006-10-11 01:21:07 -07001554 * ext4_ext_next_allocated_block:
Lukas Czernerf17722f2011-06-06 00:05:17 -04001555 * returns allocated block in subsequent extent or EXT_MAX_BLOCKS.
Randy Dunlapd0d856e2006-10-11 01:21:07 -07001556 * NOTE: it considers block number from index entry as
1557 * allocated block. Thus, index entries have to be consistent
1558 * with leaves.
Alex Tomasa86c6182006-10-11 01:21:03 -07001559 */
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05001560static ext4_lblk_t
Alex Tomasa86c6182006-10-11 01:21:03 -07001561ext4_ext_next_allocated_block(struct ext4_ext_path *path)
1562{
1563 int depth;
1564
1565 BUG_ON(path == NULL);
1566 depth = path->p_depth;
1567
1568 if (depth == 0 && path->p_ext == NULL)
Lukas Czernerf17722f2011-06-06 00:05:17 -04001569 return EXT_MAX_BLOCKS;
Alex Tomasa86c6182006-10-11 01:21:03 -07001570
1571 while (depth >= 0) {
1572 if (depth == path->p_depth) {
1573 /* leaf */
Curt Wohlgemuth6f8ff532011-10-26 04:38:59 -04001574 if (path[depth].p_ext &&
1575 path[depth].p_ext !=
Alex Tomasa86c6182006-10-11 01:21:03 -07001576 EXT_LAST_EXTENT(path[depth].p_hdr))
1577 return le32_to_cpu(path[depth].p_ext[1].ee_block);
1578 } else {
1579 /* index */
1580 if (path[depth].p_idx !=
1581 EXT_LAST_INDEX(path[depth].p_hdr))
1582 return le32_to_cpu(path[depth].p_idx[1].ei_block);
1583 }
1584 depth--;
1585 }
1586
Lukas Czernerf17722f2011-06-06 00:05:17 -04001587 return EXT_MAX_BLOCKS;
Alex Tomasa86c6182006-10-11 01:21:03 -07001588}
1589
1590/*
Randy Dunlapd0d856e2006-10-11 01:21:07 -07001591 * ext4_ext_next_leaf_block:
Lukas Czernerf17722f2011-06-06 00:05:17 -04001592 * returns first allocated block from next leaf or EXT_MAX_BLOCKS
Alex Tomasa86c6182006-10-11 01:21:03 -07001593 */
Robin Dong57187892011-07-23 21:49:07 -04001594static ext4_lblk_t ext4_ext_next_leaf_block(struct ext4_ext_path *path)
Alex Tomasa86c6182006-10-11 01:21:03 -07001595{
1596 int depth;
1597
1598 BUG_ON(path == NULL);
1599 depth = path->p_depth;
1600
1601 /* zero-tree has no leaf blocks at all */
1602 if (depth == 0)
Lukas Czernerf17722f2011-06-06 00:05:17 -04001603 return EXT_MAX_BLOCKS;
Alex Tomasa86c6182006-10-11 01:21:03 -07001604
1605 /* go to index block */
1606 depth--;
1607
1608 while (depth >= 0) {
1609 if (path[depth].p_idx !=
1610 EXT_LAST_INDEX(path[depth].p_hdr))
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05001611 return (ext4_lblk_t)
1612 le32_to_cpu(path[depth].p_idx[1].ei_block);
Alex Tomasa86c6182006-10-11 01:21:03 -07001613 depth--;
1614 }
1615
Lukas Czernerf17722f2011-06-06 00:05:17 -04001616 return EXT_MAX_BLOCKS;
Alex Tomasa86c6182006-10-11 01:21:03 -07001617}
1618
1619/*
Randy Dunlapd0d856e2006-10-11 01:21:07 -07001620 * ext4_ext_correct_indexes:
1621 * if leaf gets modified and modified extent is first in the leaf,
1622 * then we have to correct all indexes above.
Alex Tomasa86c6182006-10-11 01:21:03 -07001623 * TODO: do we need to correct tree in all cases?
1624 */
Aneesh Kumar K.V1d03ec92008-01-28 23:58:27 -05001625static int ext4_ext_correct_indexes(handle_t *handle, struct inode *inode,
Alex Tomasa86c6182006-10-11 01:21:03 -07001626 struct ext4_ext_path *path)
1627{
1628 struct ext4_extent_header *eh;
1629 int depth = ext_depth(inode);
1630 struct ext4_extent *ex;
1631 __le32 border;
1632 int k, err = 0;
1633
1634 eh = path[depth].p_hdr;
1635 ex = path[depth].p_ext;
Frank Mayhar273df552010-03-02 11:46:09 -05001636
1637 if (unlikely(ex == NULL || eh == NULL)) {
1638 EXT4_ERROR_INODE(inode,
1639 "ex %p == NULL or eh %p == NULL", ex, eh);
1640 return -EIO;
1641 }
Alex Tomasa86c6182006-10-11 01:21:03 -07001642
1643 if (depth == 0) {
1644 /* there is no tree at all */
1645 return 0;
1646 }
1647
1648 if (ex != EXT_FIRST_EXTENT(eh)) {
1649 /* we correct tree if first leaf got modified only */
1650 return 0;
1651 }
1652
1653 /*
Randy Dunlapd0d856e2006-10-11 01:21:07 -07001654 * TODO: we need correction if border is smaller than current one
Alex Tomasa86c6182006-10-11 01:21:03 -07001655 */
1656 k = depth - 1;
1657 border = path[depth].p_ext->ee_block;
Avantika Mathur7e028972006-12-06 20:41:33 -08001658 err = ext4_ext_get_access(handle, inode, path + k);
1659 if (err)
Alex Tomasa86c6182006-10-11 01:21:03 -07001660 return err;
1661 path[k].p_idx->ei_block = border;
Avantika Mathur7e028972006-12-06 20:41:33 -08001662 err = ext4_ext_dirty(handle, inode, path + k);
1663 if (err)
Alex Tomasa86c6182006-10-11 01:21:03 -07001664 return err;
1665
1666 while (k--) {
1667 /* change all left-side indexes */
1668 if (path[k+1].p_idx != EXT_FIRST_INDEX(path[k+1].p_hdr))
1669 break;
Avantika Mathur7e028972006-12-06 20:41:33 -08001670 err = ext4_ext_get_access(handle, inode, path + k);
1671 if (err)
Alex Tomasa86c6182006-10-11 01:21:03 -07001672 break;
1673 path[k].p_idx->ei_block = border;
Avantika Mathur7e028972006-12-06 20:41:33 -08001674 err = ext4_ext_dirty(handle, inode, path + k);
1675 if (err)
Alex Tomasa86c6182006-10-11 01:21:03 -07001676 break;
1677 }
1678
1679 return err;
1680}
1681
Akira Fujita748de672009-06-17 19:24:03 -04001682int
Alex Tomasa86c6182006-10-11 01:21:03 -07001683ext4_can_extents_be_merged(struct inode *inode, struct ext4_extent *ex1,
1684 struct ext4_extent *ex2)
1685{
Eric Sandeenda0169b2013-11-04 09:58:26 -05001686 unsigned short ext1_ee_len, ext2_ee_len;
Amit Aroraa2df2a62007-07-17 21:42:41 -04001687
1688 /*
Dmitry Monakhovec22ba82013-03-04 00:36:06 -05001689 * Make sure that both extents are initialized. We don't merge
Lukas Czerner556615d2014-04-20 23:45:47 -04001690 * unwritten extents so that we can be sure that end_io code has
Dmitry Monakhovec22ba82013-03-04 00:36:06 -05001691 * the extent that was written properly split out and conversion to
1692 * initialized is trivial.
Amit Aroraa2df2a62007-07-17 21:42:41 -04001693 */
Lukas Czerner556615d2014-04-20 23:45:47 -04001694 if (ext4_ext_is_unwritten(ex1) != ext4_ext_is_unwritten(ex2))
Amit Aroraa2df2a62007-07-17 21:42:41 -04001695 return 0;
1696
1697 ext1_ee_len = ext4_ext_get_actual_len(ex1);
1698 ext2_ee_len = ext4_ext_get_actual_len(ex2);
1699
1700 if (le32_to_cpu(ex1->ee_block) + ext1_ee_len !=
Andrew Morton63f57932006-10-11 01:21:24 -07001701 le32_to_cpu(ex2->ee_block))
Alex Tomasa86c6182006-10-11 01:21:03 -07001702 return 0;
1703
Suparna Bhattacharya471d4012006-10-11 01:21:06 -07001704 /*
1705 * To allow future support for preallocated extents to be added
1706 * as an RO_COMPAT feature, refuse to merge to extents if
Randy Dunlapd0d856e2006-10-11 01:21:07 -07001707 * this can result in the top bit of ee_len being set.
Suparna Bhattacharya471d4012006-10-11 01:21:06 -07001708 */
Eric Sandeenda0169b2013-11-04 09:58:26 -05001709 if (ext1_ee_len + ext2_ee_len > EXT_INIT_MAX_LEN)
Suparna Bhattacharya471d4012006-10-11 01:21:06 -07001710 return 0;
Lukas Czerner556615d2014-04-20 23:45:47 -04001711 if (ext4_ext_is_unwritten(ex1) &&
Darrick J. Wonga9b82412014-02-20 21:17:35 -05001712 (ext4_test_inode_state(inode, EXT4_STATE_DIO_UNWRITTEN) ||
1713 atomic_read(&EXT4_I(inode)->i_unwritten) ||
Lukas Czerner556615d2014-04-20 23:45:47 -04001714 (ext1_ee_len + ext2_ee_len > EXT_UNWRITTEN_MAX_LEN)))
Darrick J. Wonga9b82412014-02-20 21:17:35 -05001715 return 0;
Robert P. J. Daybbf2f9f2007-02-17 19:20:16 +01001716#ifdef AGGRESSIVE_TEST
Aneesh Kumar K.Vb939e372008-01-28 23:58:27 -05001717 if (ext1_ee_len >= 4)
Alex Tomasa86c6182006-10-11 01:21:03 -07001718 return 0;
1719#endif
1720
Theodore Ts'obf89d162010-10-27 21:30:14 -04001721 if (ext4_ext_pblock(ex1) + ext1_ee_len == ext4_ext_pblock(ex2))
Alex Tomasa86c6182006-10-11 01:21:03 -07001722 return 1;
1723 return 0;
1724}
1725
1726/*
Amit Arora56055d32007-07-17 21:42:38 -04001727 * This function tries to merge the "ex" extent to the next extent in the tree.
1728 * It always tries to merge towards right. If you want to merge towards
1729 * left, pass "ex - 1" as argument instead of "ex".
1730 * Returns 0 if the extents (ex and ex+1) were _not_ merged and returns
1731 * 1 if they got merged.
1732 */
Yongqiang Yang197217a2011-05-03 11:45:29 -04001733static int ext4_ext_try_to_merge_right(struct inode *inode,
Theodore Ts'o1f109d52010-10-27 21:30:14 -04001734 struct ext4_ext_path *path,
1735 struct ext4_extent *ex)
Amit Arora56055d32007-07-17 21:42:38 -04001736{
1737 struct ext4_extent_header *eh;
1738 unsigned int depth, len;
Lukas Czerner556615d2014-04-20 23:45:47 -04001739 int merge_done = 0, unwritten;
Amit Arora56055d32007-07-17 21:42:38 -04001740
1741 depth = ext_depth(inode);
1742 BUG_ON(path[depth].p_hdr == NULL);
1743 eh = path[depth].p_hdr;
1744
1745 while (ex < EXT_LAST_EXTENT(eh)) {
1746 if (!ext4_can_extents_be_merged(inode, ex, ex + 1))
1747 break;
1748 /* merge with next extent! */
Lukas Czerner556615d2014-04-20 23:45:47 -04001749 unwritten = ext4_ext_is_unwritten(ex);
Amit Arora56055d32007-07-17 21:42:38 -04001750 ex->ee_len = cpu_to_le16(ext4_ext_get_actual_len(ex)
1751 + ext4_ext_get_actual_len(ex + 1));
Lukas Czerner556615d2014-04-20 23:45:47 -04001752 if (unwritten)
1753 ext4_ext_mark_unwritten(ex);
Amit Arora56055d32007-07-17 21:42:38 -04001754
1755 if (ex + 1 < EXT_LAST_EXTENT(eh)) {
1756 len = (EXT_LAST_EXTENT(eh) - ex - 1)
1757 * sizeof(struct ext4_extent);
1758 memmove(ex + 1, ex + 2, len);
1759 }
Marcin Slusarze8546d02008-04-17 10:38:59 -04001760 le16_add_cpu(&eh->eh_entries, -1);
Amit Arora56055d32007-07-17 21:42:38 -04001761 merge_done = 1;
1762 WARN_ON(eh->eh_entries == 0);
1763 if (!eh->eh_entries)
Theodore Ts'o24676da2010-05-16 21:00:00 -04001764 EXT4_ERROR_INODE(inode, "eh->eh_entries = 0!");
Amit Arora56055d32007-07-17 21:42:38 -04001765 }
1766
1767 return merge_done;
1768}
1769
1770/*
Theodore Ts'oecb94f52012-08-17 09:44:17 -04001771 * This function does a very simple check to see if we can collapse
1772 * an extent tree with a single extent tree leaf block into the inode.
1773 */
1774static void ext4_ext_try_to_merge_up(handle_t *handle,
1775 struct inode *inode,
1776 struct ext4_ext_path *path)
1777{
1778 size_t s;
1779 unsigned max_root = ext4_ext_space_root(inode, 0);
1780 ext4_fsblk_t blk;
1781
1782 if ((path[0].p_depth != 1) ||
1783 (le16_to_cpu(path[0].p_hdr->eh_entries) != 1) ||
1784 (le16_to_cpu(path[1].p_hdr->eh_entries) > max_root))
1785 return;
1786
1787 /*
1788 * We need to modify the block allocation bitmap and the block
1789 * group descriptor to release the extent tree block. If we
1790 * can't get the journal credits, give up.
1791 */
1792 if (ext4_journal_extend(handle, 2))
1793 return;
1794
1795 /*
1796 * Copy the extent data up to the inode
1797 */
1798 blk = ext4_idx_pblock(path[0].p_idx);
1799 s = le16_to_cpu(path[1].p_hdr->eh_entries) *
1800 sizeof(struct ext4_extent_idx);
1801 s += sizeof(struct ext4_extent_header);
1802
1803 memcpy(path[0].p_hdr, path[1].p_hdr, s);
1804 path[0].p_depth = 0;
1805 path[0].p_ext = EXT_FIRST_EXTENT(path[0].p_hdr) +
1806 (path[1].p_ext - EXT_FIRST_EXTENT(path[1].p_hdr));
1807 path[0].p_hdr->eh_max = cpu_to_le16(max_root);
1808
1809 brelse(path[1].p_bh);
1810 ext4_free_blocks(handle, inode, NULL, blk, 1,
Jan Kara7d734532013-08-17 09:36:54 -04001811 EXT4_FREE_BLOCKS_METADATA | EXT4_FREE_BLOCKS_FORGET |
1812 EXT4_FREE_BLOCKS_RESERVE);
Theodore Ts'oecb94f52012-08-17 09:44:17 -04001813}
1814
1815/*
Yongqiang Yang197217a2011-05-03 11:45:29 -04001816 * This function tries to merge the @ex extent to neighbours in the tree.
1817 * return 1 if merge left else 0.
1818 */
Theodore Ts'oecb94f52012-08-17 09:44:17 -04001819static void ext4_ext_try_to_merge(handle_t *handle,
1820 struct inode *inode,
Yongqiang Yang197217a2011-05-03 11:45:29 -04001821 struct ext4_ext_path *path,
1822 struct ext4_extent *ex) {
1823 struct ext4_extent_header *eh;
1824 unsigned int depth;
1825 int merge_done = 0;
Yongqiang Yang197217a2011-05-03 11:45:29 -04001826
1827 depth = ext_depth(inode);
1828 BUG_ON(path[depth].p_hdr == NULL);
1829 eh = path[depth].p_hdr;
1830
1831 if (ex > EXT_FIRST_EXTENT(eh))
1832 merge_done = ext4_ext_try_to_merge_right(inode, path, ex - 1);
1833
1834 if (!merge_done)
Theodore Ts'oecb94f52012-08-17 09:44:17 -04001835 (void) ext4_ext_try_to_merge_right(inode, path, ex);
Yongqiang Yang197217a2011-05-03 11:45:29 -04001836
Theodore Ts'oecb94f52012-08-17 09:44:17 -04001837 ext4_ext_try_to_merge_up(handle, inode, path);
Yongqiang Yang197217a2011-05-03 11:45:29 -04001838}
1839
1840/*
Amit Arora25d14f92007-05-24 13:04:13 -04001841 * check if a portion of the "newext" extent overlaps with an
1842 * existing extent.
1843 *
1844 * If there is an overlap discovered, it updates the length of the newext
1845 * such that there will be no overlap, and then returns 1.
1846 * If there is no overlap found, it returns 0.
1847 */
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04001848static unsigned int ext4_ext_check_overlap(struct ext4_sb_info *sbi,
1849 struct inode *inode,
Theodore Ts'o1f109d52010-10-27 21:30:14 -04001850 struct ext4_extent *newext,
1851 struct ext4_ext_path *path)
Amit Arora25d14f92007-05-24 13:04:13 -04001852{
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05001853 ext4_lblk_t b1, b2;
Amit Arora25d14f92007-05-24 13:04:13 -04001854 unsigned int depth, len1;
1855 unsigned int ret = 0;
1856
1857 b1 = le32_to_cpu(newext->ee_block);
Amit Aroraa2df2a62007-07-17 21:42:41 -04001858 len1 = ext4_ext_get_actual_len(newext);
Amit Arora25d14f92007-05-24 13:04:13 -04001859 depth = ext_depth(inode);
1860 if (!path[depth].p_ext)
1861 goto out;
Theodore Ts'of5a44db2013-12-20 09:29:35 -05001862 b2 = EXT4_LBLK_CMASK(sbi, le32_to_cpu(path[depth].p_ext->ee_block));
Amit Arora25d14f92007-05-24 13:04:13 -04001863
1864 /*
1865 * get the next allocated block if the extent in the path
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001866 * is before the requested block(s)
Amit Arora25d14f92007-05-24 13:04:13 -04001867 */
1868 if (b2 < b1) {
1869 b2 = ext4_ext_next_allocated_block(path);
Lukas Czernerf17722f2011-06-06 00:05:17 -04001870 if (b2 == EXT_MAX_BLOCKS)
Amit Arora25d14f92007-05-24 13:04:13 -04001871 goto out;
Theodore Ts'of5a44db2013-12-20 09:29:35 -05001872 b2 = EXT4_LBLK_CMASK(sbi, b2);
Amit Arora25d14f92007-05-24 13:04:13 -04001873 }
1874
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05001875 /* check for wrap through zero on extent logical start block*/
Amit Arora25d14f92007-05-24 13:04:13 -04001876 if (b1 + len1 < b1) {
Lukas Czernerf17722f2011-06-06 00:05:17 -04001877 len1 = EXT_MAX_BLOCKS - b1;
Amit Arora25d14f92007-05-24 13:04:13 -04001878 newext->ee_len = cpu_to_le16(len1);
1879 ret = 1;
1880 }
1881
1882 /* check for overlap */
1883 if (b1 + len1 > b2) {
1884 newext->ee_len = cpu_to_le16(b2 - b1);
1885 ret = 1;
1886 }
1887out:
1888 return ret;
1889}
1890
1891/*
Randy Dunlapd0d856e2006-10-11 01:21:07 -07001892 * ext4_ext_insert_extent:
1893 * tries to merge requsted extent into the existing extent or
1894 * inserts requested extent as new one into the tree,
1895 * creating new leaf in the no-space case.
Alex Tomasa86c6182006-10-11 01:21:03 -07001896 */
1897int ext4_ext_insert_extent(handle_t *handle, struct inode *inode,
1898 struct ext4_ext_path *path,
Theodore Ts'o107a7bd2013-08-16 21:23:41 -04001899 struct ext4_extent *newext, int gb_flags)
Alex Tomasa86c6182006-10-11 01:21:03 -07001900{
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001901 struct ext4_extent_header *eh;
Alex Tomasa86c6182006-10-11 01:21:03 -07001902 struct ext4_extent *ex, *fex;
1903 struct ext4_extent *nearex; /* nearest extent */
1904 struct ext4_ext_path *npath = NULL;
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05001905 int depth, len, err;
1906 ext4_lblk_t next;
Lukas Czerner556615d2014-04-20 23:45:47 -04001907 int mb_flags = 0, unwritten;
Alex Tomasa86c6182006-10-11 01:21:03 -07001908
Frank Mayhar273df552010-03-02 11:46:09 -05001909 if (unlikely(ext4_ext_get_actual_len(newext) == 0)) {
1910 EXT4_ERROR_INODE(inode, "ext4_ext_get_actual_len(newext) == 0");
1911 return -EIO;
1912 }
Alex Tomasa86c6182006-10-11 01:21:03 -07001913 depth = ext_depth(inode);
1914 ex = path[depth].p_ext;
Lukas Czernerbe8981b2013-04-03 23:33:28 -04001915 eh = path[depth].p_hdr;
Frank Mayhar273df552010-03-02 11:46:09 -05001916 if (unlikely(path[depth].p_hdr == NULL)) {
1917 EXT4_ERROR_INODE(inode, "path[%d].p_hdr == NULL", depth);
1918 return -EIO;
1919 }
Alex Tomasa86c6182006-10-11 01:21:03 -07001920
1921 /* try to insert block into found extent and return */
Theodore Ts'o107a7bd2013-08-16 21:23:41 -04001922 if (ex && !(gb_flags & EXT4_GET_BLOCKS_PRE_IO)) {
Amit Aroraa2df2a62007-07-17 21:42:41 -04001923
1924 /*
Lukas Czernerbe8981b2013-04-03 23:33:28 -04001925 * Try to see whether we should rather test the extent on
1926 * right from ex, or from the left of ex. This is because
1927 * ext4_ext_find_extent() can return either extent on the
1928 * left, or on the right from the searched position. This
1929 * will make merging more effective.
Amit Aroraa2df2a62007-07-17 21:42:41 -04001930 */
Lukas Czernerbe8981b2013-04-03 23:33:28 -04001931 if (ex < EXT_LAST_EXTENT(eh) &&
1932 (le32_to_cpu(ex->ee_block) +
1933 ext4_ext_get_actual_len(ex) <
1934 le32_to_cpu(newext->ee_block))) {
1935 ex += 1;
1936 goto prepend;
1937 } else if ((ex > EXT_FIRST_EXTENT(eh)) &&
1938 (le32_to_cpu(newext->ee_block) +
1939 ext4_ext_get_actual_len(newext) <
1940 le32_to_cpu(ex->ee_block)))
1941 ex -= 1;
1942
1943 /* Try to append newex to the ex */
1944 if (ext4_can_extents_be_merged(inode, ex, newext)) {
1945 ext_debug("append [%d]%d block to %u:[%d]%d"
1946 "(from %llu)\n",
Lukas Czerner556615d2014-04-20 23:45:47 -04001947 ext4_ext_is_unwritten(newext),
Lukas Czernerbe8981b2013-04-03 23:33:28 -04001948 ext4_ext_get_actual_len(newext),
1949 le32_to_cpu(ex->ee_block),
Lukas Czerner556615d2014-04-20 23:45:47 -04001950 ext4_ext_is_unwritten(ex),
Lukas Czernerbe8981b2013-04-03 23:33:28 -04001951 ext4_ext_get_actual_len(ex),
1952 ext4_ext_pblock(ex));
1953 err = ext4_ext_get_access(handle, inode,
1954 path + depth);
1955 if (err)
1956 return err;
Lukas Czerner556615d2014-04-20 23:45:47 -04001957 unwritten = ext4_ext_is_unwritten(ex);
Lukas Czernerbe8981b2013-04-03 23:33:28 -04001958 ex->ee_len = cpu_to_le16(ext4_ext_get_actual_len(ex)
Amit Aroraa2df2a62007-07-17 21:42:41 -04001959 + ext4_ext_get_actual_len(newext));
Lukas Czerner556615d2014-04-20 23:45:47 -04001960 if (unwritten)
1961 ext4_ext_mark_unwritten(ex);
Lukas Czernerbe8981b2013-04-03 23:33:28 -04001962 eh = path[depth].p_hdr;
1963 nearex = ex;
1964 goto merge;
1965 }
1966
1967prepend:
1968 /* Try to prepend newex to the ex */
1969 if (ext4_can_extents_be_merged(inode, newext, ex)) {
1970 ext_debug("prepend %u[%d]%d block to %u:[%d]%d"
1971 "(from %llu)\n",
1972 le32_to_cpu(newext->ee_block),
Lukas Czerner556615d2014-04-20 23:45:47 -04001973 ext4_ext_is_unwritten(newext),
Lukas Czernerbe8981b2013-04-03 23:33:28 -04001974 ext4_ext_get_actual_len(newext),
1975 le32_to_cpu(ex->ee_block),
Lukas Czerner556615d2014-04-20 23:45:47 -04001976 ext4_ext_is_unwritten(ex),
Lukas Czernerbe8981b2013-04-03 23:33:28 -04001977 ext4_ext_get_actual_len(ex),
1978 ext4_ext_pblock(ex));
1979 err = ext4_ext_get_access(handle, inode,
1980 path + depth);
1981 if (err)
1982 return err;
1983
Lukas Czerner556615d2014-04-20 23:45:47 -04001984 unwritten = ext4_ext_is_unwritten(ex);
Lukas Czernerbe8981b2013-04-03 23:33:28 -04001985 ex->ee_block = newext->ee_block;
1986 ext4_ext_store_pblock(ex, ext4_ext_pblock(newext));
1987 ex->ee_len = cpu_to_le16(ext4_ext_get_actual_len(ex)
1988 + ext4_ext_get_actual_len(newext));
Lukas Czerner556615d2014-04-20 23:45:47 -04001989 if (unwritten)
1990 ext4_ext_mark_unwritten(ex);
Lukas Czernerbe8981b2013-04-03 23:33:28 -04001991 eh = path[depth].p_hdr;
1992 nearex = ex;
1993 goto merge;
1994 }
Alex Tomasa86c6182006-10-11 01:21:03 -07001995 }
1996
Alex Tomasa86c6182006-10-11 01:21:03 -07001997 depth = ext_depth(inode);
1998 eh = path[depth].p_hdr;
1999 if (le16_to_cpu(eh->eh_entries) < le16_to_cpu(eh->eh_max))
2000 goto has_space;
2001
2002 /* probably next leaf has space for us? */
2003 fex = EXT_LAST_EXTENT(eh);
Robin Dong598dbdf2011-07-11 18:24:01 -04002004 next = EXT_MAX_BLOCKS;
2005 if (le32_to_cpu(newext->ee_block) > le32_to_cpu(fex->ee_block))
Robin Dong57187892011-07-23 21:49:07 -04002006 next = ext4_ext_next_leaf_block(path);
Robin Dong598dbdf2011-07-11 18:24:01 -04002007 if (next != EXT_MAX_BLOCKS) {
Yongqiang Yang32de6752011-11-01 18:56:41 -04002008 ext_debug("next leaf block - %u\n", next);
Alex Tomasa86c6182006-10-11 01:21:03 -07002009 BUG_ON(npath != NULL);
Theodore Ts'o107a7bd2013-08-16 21:23:41 -04002010 npath = ext4_ext_find_extent(inode, next, NULL, 0);
Alex Tomasa86c6182006-10-11 01:21:03 -07002011 if (IS_ERR(npath))
2012 return PTR_ERR(npath);
2013 BUG_ON(npath->p_depth != path->p_depth);
2014 eh = npath[depth].p_hdr;
2015 if (le16_to_cpu(eh->eh_entries) < le16_to_cpu(eh->eh_max)) {
Lucas De Marchi25985ed2011-03-30 22:57:33 -03002016 ext_debug("next leaf isn't full(%d)\n",
Alex Tomasa86c6182006-10-11 01:21:03 -07002017 le16_to_cpu(eh->eh_entries));
2018 path = npath;
Robin Dongffb505f2011-07-11 11:43:59 -04002019 goto has_space;
Alex Tomasa86c6182006-10-11 01:21:03 -07002020 }
2021 ext_debug("next leaf has no free space(%d,%d)\n",
2022 le16_to_cpu(eh->eh_entries), le16_to_cpu(eh->eh_max));
2023 }
2024
2025 /*
Randy Dunlapd0d856e2006-10-11 01:21:07 -07002026 * There is no free space in the found leaf.
2027 * We're gonna add a new leaf in the tree.
Alex Tomasa86c6182006-10-11 01:21:03 -07002028 */
Theodore Ts'o107a7bd2013-08-16 21:23:41 -04002029 if (gb_flags & EXT4_GET_BLOCKS_METADATA_NOFAIL)
2030 mb_flags = EXT4_MB_USE_RESERVED;
2031 err = ext4_ext_create_new_leaf(handle, inode, mb_flags, gb_flags,
2032 path, newext);
Alex Tomasa86c6182006-10-11 01:21:03 -07002033 if (err)
2034 goto cleanup;
2035 depth = ext_depth(inode);
2036 eh = path[depth].p_hdr;
2037
2038has_space:
2039 nearex = path[depth].p_ext;
2040
Avantika Mathur7e028972006-12-06 20:41:33 -08002041 err = ext4_ext_get_access(handle, inode, path + depth);
2042 if (err)
Alex Tomasa86c6182006-10-11 01:21:03 -07002043 goto cleanup;
2044
2045 if (!nearex) {
2046 /* there is no extent in this leaf, create first one */
Yongqiang Yang32de6752011-11-01 18:56:41 -04002047 ext_debug("first extent in the leaf: %u:%llu:[%d]%d\n",
Dave Kleikamp8c55e202007-05-24 13:04:54 -04002048 le32_to_cpu(newext->ee_block),
Theodore Ts'obf89d162010-10-27 21:30:14 -04002049 ext4_ext_pblock(newext),
Lukas Czerner556615d2014-04-20 23:45:47 -04002050 ext4_ext_is_unwritten(newext),
Amit Aroraa2df2a62007-07-17 21:42:41 -04002051 ext4_ext_get_actual_len(newext));
Eric Gouriou80e675f2011-10-27 11:52:18 -04002052 nearex = EXT_FIRST_EXTENT(eh);
2053 } else {
2054 if (le32_to_cpu(newext->ee_block)
Dave Kleikamp8c55e202007-05-24 13:04:54 -04002055 > le32_to_cpu(nearex->ee_block)) {
Eric Gouriou80e675f2011-10-27 11:52:18 -04002056 /* Insert after */
Yongqiang Yang32de6752011-11-01 18:56:41 -04002057 ext_debug("insert %u:%llu:[%d]%d before: "
2058 "nearest %p\n",
Dave Kleikamp8c55e202007-05-24 13:04:54 -04002059 le32_to_cpu(newext->ee_block),
Theodore Ts'obf89d162010-10-27 21:30:14 -04002060 ext4_ext_pblock(newext),
Lukas Czerner556615d2014-04-20 23:45:47 -04002061 ext4_ext_is_unwritten(newext),
Amit Aroraa2df2a62007-07-17 21:42:41 -04002062 ext4_ext_get_actual_len(newext),
Eric Gouriou80e675f2011-10-27 11:52:18 -04002063 nearex);
2064 nearex++;
2065 } else {
2066 /* Insert before */
2067 BUG_ON(newext->ee_block == nearex->ee_block);
Yongqiang Yang32de6752011-11-01 18:56:41 -04002068 ext_debug("insert %u:%llu:[%d]%d after: "
2069 "nearest %p\n",
Eric Gouriou80e675f2011-10-27 11:52:18 -04002070 le32_to_cpu(newext->ee_block),
2071 ext4_ext_pblock(newext),
Lukas Czerner556615d2014-04-20 23:45:47 -04002072 ext4_ext_is_unwritten(newext),
Eric Gouriou80e675f2011-10-27 11:52:18 -04002073 ext4_ext_get_actual_len(newext),
2074 nearex);
Alex Tomasa86c6182006-10-11 01:21:03 -07002075 }
Eric Gouriou80e675f2011-10-27 11:52:18 -04002076 len = EXT_LAST_EXTENT(eh) - nearex + 1;
2077 if (len > 0) {
Yongqiang Yang32de6752011-11-01 18:56:41 -04002078 ext_debug("insert %u:%llu:[%d]%d: "
Eric Gouriou80e675f2011-10-27 11:52:18 -04002079 "move %d extents from 0x%p to 0x%p\n",
2080 le32_to_cpu(newext->ee_block),
2081 ext4_ext_pblock(newext),
Lukas Czerner556615d2014-04-20 23:45:47 -04002082 ext4_ext_is_unwritten(newext),
Eric Gouriou80e675f2011-10-27 11:52:18 -04002083 ext4_ext_get_actual_len(newext),
2084 len, nearex, nearex + 1);
2085 memmove(nearex + 1, nearex,
2086 len * sizeof(struct ext4_extent));
2087 }
Alex Tomasa86c6182006-10-11 01:21:03 -07002088 }
2089
Marcin Slusarze8546d02008-04-17 10:38:59 -04002090 le16_add_cpu(&eh->eh_entries, 1);
Eric Gouriou80e675f2011-10-27 11:52:18 -04002091 path[depth].p_ext = nearex;
Alex Tomasa86c6182006-10-11 01:21:03 -07002092 nearex->ee_block = newext->ee_block;
Theodore Ts'obf89d162010-10-27 21:30:14 -04002093 ext4_ext_store_pblock(nearex, ext4_ext_pblock(newext));
Alex Tomasa86c6182006-10-11 01:21:03 -07002094 nearex->ee_len = newext->ee_len;
Alex Tomasa86c6182006-10-11 01:21:03 -07002095
2096merge:
HaiboLiue7bcf822012-07-09 16:29:28 -04002097 /* try to merge extents */
Theodore Ts'o107a7bd2013-08-16 21:23:41 -04002098 if (!(gb_flags & EXT4_GET_BLOCKS_PRE_IO))
Theodore Ts'oecb94f52012-08-17 09:44:17 -04002099 ext4_ext_try_to_merge(handle, inode, path, nearex);
Alex Tomasa86c6182006-10-11 01:21:03 -07002100
Alex Tomasa86c6182006-10-11 01:21:03 -07002101
2102 /* time to correct all indexes above */
2103 err = ext4_ext_correct_indexes(handle, inode, path);
2104 if (err)
2105 goto cleanup;
2106
Theodore Ts'oecb94f52012-08-17 09:44:17 -04002107 err = ext4_ext_dirty(handle, inode, path + path->p_depth);
Alex Tomasa86c6182006-10-11 01:21:03 -07002108
2109cleanup:
2110 if (npath) {
2111 ext4_ext_drop_refs(npath);
2112 kfree(npath);
2113 }
Alex Tomasa86c6182006-10-11 01:21:03 -07002114 return err;
2115}
2116
Lukas Czerner91dd8c12012-11-28 12:32:26 -05002117static int ext4_fill_fiemap_extents(struct inode *inode,
2118 ext4_lblk_t block, ext4_lblk_t num,
2119 struct fiemap_extent_info *fieinfo)
Eric Sandeen6873fa02008-10-07 00:46:36 -04002120{
2121 struct ext4_ext_path *path = NULL;
Eric Sandeen6873fa02008-10-07 00:46:36 -04002122 struct ext4_extent *ex;
Zheng Liu69eb33d2013-02-18 00:31:07 -05002123 struct extent_status es;
Lukas Czerner91dd8c12012-11-28 12:32:26 -05002124 ext4_lblk_t next, next_del, start = 0, end = 0;
Eric Sandeen6873fa02008-10-07 00:46:36 -04002125 ext4_lblk_t last = block + num;
Lukas Czerner91dd8c12012-11-28 12:32:26 -05002126 int exists, depth = 0, err = 0;
2127 unsigned int flags = 0;
2128 unsigned char blksize_bits = inode->i_sb->s_blocksize_bits;
Eric Sandeen6873fa02008-10-07 00:46:36 -04002129
Lukas Czernerf17722f2011-06-06 00:05:17 -04002130 while (block < last && block != EXT_MAX_BLOCKS) {
Eric Sandeen6873fa02008-10-07 00:46:36 -04002131 num = last - block;
2132 /* find extent for this block */
Theodore Ts'ofab3a542009-12-09 21:30:02 -05002133 down_read(&EXT4_I(inode)->i_data_sem);
Lukas Czerner91dd8c12012-11-28 12:32:26 -05002134
2135 if (path && ext_depth(inode) != depth) {
2136 /* depth was changed. we have to realloc path */
2137 kfree(path);
2138 path = NULL;
2139 }
2140
Theodore Ts'o107a7bd2013-08-16 21:23:41 -04002141 path = ext4_ext_find_extent(inode, block, path, 0);
Eric Sandeen6873fa02008-10-07 00:46:36 -04002142 if (IS_ERR(path)) {
Lukas Czerner91dd8c12012-11-28 12:32:26 -05002143 up_read(&EXT4_I(inode)->i_data_sem);
Eric Sandeen6873fa02008-10-07 00:46:36 -04002144 err = PTR_ERR(path);
2145 path = NULL;
2146 break;
2147 }
2148
2149 depth = ext_depth(inode);
Frank Mayhar273df552010-03-02 11:46:09 -05002150 if (unlikely(path[depth].p_hdr == NULL)) {
Lukas Czerner91dd8c12012-11-28 12:32:26 -05002151 up_read(&EXT4_I(inode)->i_data_sem);
Frank Mayhar273df552010-03-02 11:46:09 -05002152 EXT4_ERROR_INODE(inode, "path[%d].p_hdr == NULL", depth);
2153 err = -EIO;
2154 break;
2155 }
Eric Sandeen6873fa02008-10-07 00:46:36 -04002156 ex = path[depth].p_ext;
2157 next = ext4_ext_next_allocated_block(path);
Lukas Czerner91dd8c12012-11-28 12:32:26 -05002158 ext4_ext_drop_refs(path);
Eric Sandeen6873fa02008-10-07 00:46:36 -04002159
Lukas Czerner91dd8c12012-11-28 12:32:26 -05002160 flags = 0;
Eric Sandeen6873fa02008-10-07 00:46:36 -04002161 exists = 0;
2162 if (!ex) {
2163 /* there is no extent yet, so try to allocate
2164 * all requested space */
2165 start = block;
2166 end = block + num;
2167 } else if (le32_to_cpu(ex->ee_block) > block) {
2168 /* need to allocate space before found extent */
2169 start = block;
2170 end = le32_to_cpu(ex->ee_block);
2171 if (block + num < end)
2172 end = block + num;
2173 } else if (block >= le32_to_cpu(ex->ee_block)
2174 + ext4_ext_get_actual_len(ex)) {
2175 /* need to allocate space after found extent */
2176 start = block;
2177 end = block + num;
2178 if (end >= next)
2179 end = next;
2180 } else if (block >= le32_to_cpu(ex->ee_block)) {
2181 /*
2182 * some part of requested space is covered
2183 * by found extent
2184 */
2185 start = block;
2186 end = le32_to_cpu(ex->ee_block)
2187 + ext4_ext_get_actual_len(ex);
2188 if (block + num < end)
2189 end = block + num;
2190 exists = 1;
2191 } else {
2192 BUG();
2193 }
2194 BUG_ON(end <= start);
2195
2196 if (!exists) {
Zheng Liu69eb33d2013-02-18 00:31:07 -05002197 es.es_lblk = start;
2198 es.es_len = end - start;
2199 es.es_pblk = 0;
Eric Sandeen6873fa02008-10-07 00:46:36 -04002200 } else {
Zheng Liu69eb33d2013-02-18 00:31:07 -05002201 es.es_lblk = le32_to_cpu(ex->ee_block);
2202 es.es_len = ext4_ext_get_actual_len(ex);
2203 es.es_pblk = ext4_ext_pblock(ex);
Lukas Czerner556615d2014-04-20 23:45:47 -04002204 if (ext4_ext_is_unwritten(ex))
Lukas Czerner91dd8c12012-11-28 12:32:26 -05002205 flags |= FIEMAP_EXTENT_UNWRITTEN;
Eric Sandeen6873fa02008-10-07 00:46:36 -04002206 }
2207
Lukas Czerner91dd8c12012-11-28 12:32:26 -05002208 /*
Zheng Liu69eb33d2013-02-18 00:31:07 -05002209 * Find delayed extent and update es accordingly. We call
2210 * it even in !exists case to find out whether es is the
Lukas Czerner91dd8c12012-11-28 12:32:26 -05002211 * last existing extent or not.
2212 */
Zheng Liu69eb33d2013-02-18 00:31:07 -05002213 next_del = ext4_find_delayed_extent(inode, &es);
Lukas Czerner91dd8c12012-11-28 12:32:26 -05002214 if (!exists && next_del) {
2215 exists = 1;
Jie Liu72dac952013-06-12 23:13:59 -04002216 flags |= (FIEMAP_EXTENT_DELALLOC |
2217 FIEMAP_EXTENT_UNKNOWN);
Lukas Czerner91dd8c12012-11-28 12:32:26 -05002218 }
2219 up_read(&EXT4_I(inode)->i_data_sem);
2220
Zheng Liu69eb33d2013-02-18 00:31:07 -05002221 if (unlikely(es.es_len == 0)) {
2222 EXT4_ERROR_INODE(inode, "es.es_len == 0");
Frank Mayhar273df552010-03-02 11:46:09 -05002223 err = -EIO;
2224 break;
2225 }
Eric Sandeen6873fa02008-10-07 00:46:36 -04002226
Zheng Liuf7fec032013-02-18 00:28:47 -05002227 /*
2228 * This is possible iff next == next_del == EXT_MAX_BLOCKS.
2229 * we need to check next == EXT_MAX_BLOCKS because it is
2230 * possible that an extent is with unwritten and delayed
2231 * status due to when an extent is delayed allocated and
2232 * is allocated by fallocate status tree will track both of
2233 * them in a extent.
2234 *
2235 * So we could return a unwritten and delayed extent, and
2236 * its block is equal to 'next'.
2237 */
2238 if (next == next_del && next == EXT_MAX_BLOCKS) {
Lukas Czerner91dd8c12012-11-28 12:32:26 -05002239 flags |= FIEMAP_EXTENT_LAST;
2240 if (unlikely(next_del != EXT_MAX_BLOCKS ||
2241 next != EXT_MAX_BLOCKS)) {
2242 EXT4_ERROR_INODE(inode,
2243 "next extent == %u, next "
2244 "delalloc extent = %u",
2245 next, next_del);
2246 err = -EIO;
2247 break;
2248 }
Eric Sandeen6873fa02008-10-07 00:46:36 -04002249 }
2250
Lukas Czerner91dd8c12012-11-28 12:32:26 -05002251 if (exists) {
2252 err = fiemap_fill_next_extent(fieinfo,
Zheng Liu69eb33d2013-02-18 00:31:07 -05002253 (__u64)es.es_lblk << blksize_bits,
2254 (__u64)es.es_pblk << blksize_bits,
2255 (__u64)es.es_len << blksize_bits,
Lukas Czerner91dd8c12012-11-28 12:32:26 -05002256 flags);
2257 if (err < 0)
2258 break;
2259 if (err == 1) {
2260 err = 0;
2261 break;
2262 }
Eric Sandeen6873fa02008-10-07 00:46:36 -04002263 }
2264
Zheng Liu69eb33d2013-02-18 00:31:07 -05002265 block = es.es_lblk + es.es_len;
Eric Sandeen6873fa02008-10-07 00:46:36 -04002266 }
2267
2268 if (path) {
2269 ext4_ext_drop_refs(path);
2270 kfree(path);
2271 }
2272
2273 return err;
2274}
2275
Alex Tomasa86c6182006-10-11 01:21:03 -07002276/*
Randy Dunlapd0d856e2006-10-11 01:21:07 -07002277 * ext4_ext_put_gap_in_cache:
2278 * calculate boundaries of the gap that the requested block fits into
Alex Tomasa86c6182006-10-11 01:21:03 -07002279 * and cache this gap
2280 */
Avantika Mathur09b88252006-12-06 20:41:36 -08002281static void
Alex Tomasa86c6182006-10-11 01:21:03 -07002282ext4_ext_put_gap_in_cache(struct inode *inode, struct ext4_ext_path *path,
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05002283 ext4_lblk_t block)
Alex Tomasa86c6182006-10-11 01:21:03 -07002284{
2285 int depth = ext_depth(inode);
Andi Shyti27b1b222013-08-28 14:00:00 -04002286 unsigned long len = 0;
2287 ext4_lblk_t lblock = 0;
Alex Tomasa86c6182006-10-11 01:21:03 -07002288 struct ext4_extent *ex;
2289
2290 ex = path[depth].p_ext;
2291 if (ex == NULL) {
Zheng Liu69eb33d2013-02-18 00:31:07 -05002292 /*
2293 * there is no extent yet, so gap is [0;-] and we
2294 * don't cache it
2295 */
Alex Tomasa86c6182006-10-11 01:21:03 -07002296 ext_debug("cache gap(whole file):");
2297 } else if (block < le32_to_cpu(ex->ee_block)) {
2298 lblock = block;
2299 len = le32_to_cpu(ex->ee_block) - block;
Eric Sandeenbba90742008-01-28 23:58:27 -05002300 ext_debug("cache gap(before): %u [%u:%u]",
2301 block,
2302 le32_to_cpu(ex->ee_block),
2303 ext4_ext_get_actual_len(ex));
Zheng Liud100eef2013-02-18 00:29:59 -05002304 if (!ext4_find_delalloc_range(inode, lblock, lblock + len - 1))
2305 ext4_es_insert_extent(inode, lblock, len, ~0,
2306 EXTENT_STATUS_HOLE);
Alex Tomasa86c6182006-10-11 01:21:03 -07002307 } else if (block >= le32_to_cpu(ex->ee_block)
Amit Aroraa2df2a62007-07-17 21:42:41 -04002308 + ext4_ext_get_actual_len(ex)) {
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05002309 ext4_lblk_t next;
Dave Kleikamp8c55e202007-05-24 13:04:54 -04002310 lblock = le32_to_cpu(ex->ee_block)
Amit Aroraa2df2a62007-07-17 21:42:41 -04002311 + ext4_ext_get_actual_len(ex);
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05002312
2313 next = ext4_ext_next_allocated_block(path);
Eric Sandeenbba90742008-01-28 23:58:27 -05002314 ext_debug("cache gap(after): [%u:%u] %u",
2315 le32_to_cpu(ex->ee_block),
2316 ext4_ext_get_actual_len(ex),
2317 block);
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05002318 BUG_ON(next == lblock);
2319 len = next - lblock;
Zheng Liud100eef2013-02-18 00:29:59 -05002320 if (!ext4_find_delalloc_range(inode, lblock, lblock + len - 1))
2321 ext4_es_insert_extent(inode, lblock, len, ~0,
2322 EXTENT_STATUS_HOLE);
Alex Tomasa86c6182006-10-11 01:21:03 -07002323 } else {
Alex Tomasa86c6182006-10-11 01:21:03 -07002324 BUG();
2325 }
2326
Eric Sandeenbba90742008-01-28 23:58:27 -05002327 ext_debug(" -> %u:%lu\n", lblock, len);
Alex Tomasa86c6182006-10-11 01:21:03 -07002328}
2329
2330/*
Randy Dunlapd0d856e2006-10-11 01:21:07 -07002331 * ext4_ext_rm_idx:
2332 * removes index from the index block.
Alex Tomasa86c6182006-10-11 01:21:03 -07002333 */
Aneesh Kumar K.V1d03ec92008-01-28 23:58:27 -05002334static int ext4_ext_rm_idx(handle_t *handle, struct inode *inode,
Forrest Liuc36575e2012-12-17 09:55:39 -05002335 struct ext4_ext_path *path, int depth)
Alex Tomasa86c6182006-10-11 01:21:03 -07002336{
Alex Tomasa86c6182006-10-11 01:21:03 -07002337 int err;
Alex Tomasf65e6fb2006-10-11 01:21:05 -07002338 ext4_fsblk_t leaf;
Alex Tomasa86c6182006-10-11 01:21:03 -07002339
2340 /* free index block */
Forrest Liuc36575e2012-12-17 09:55:39 -05002341 depth--;
2342 path = path + depth;
Theodore Ts'obf89d162010-10-27 21:30:14 -04002343 leaf = ext4_idx_pblock(path->p_idx);
Frank Mayhar273df552010-03-02 11:46:09 -05002344 if (unlikely(path->p_hdr->eh_entries == 0)) {
2345 EXT4_ERROR_INODE(inode, "path->p_hdr->eh_entries == 0");
2346 return -EIO;
2347 }
Avantika Mathur7e028972006-12-06 20:41:33 -08002348 err = ext4_ext_get_access(handle, inode, path);
2349 if (err)
Alex Tomasa86c6182006-10-11 01:21:03 -07002350 return err;
Robin Dong0e1147b2011-07-27 21:29:33 -04002351
2352 if (path->p_idx != EXT_LAST_INDEX(path->p_hdr)) {
2353 int len = EXT_LAST_INDEX(path->p_hdr) - path->p_idx;
2354 len *= sizeof(struct ext4_extent_idx);
2355 memmove(path->p_idx, path->p_idx + 1, len);
2356 }
2357
Marcin Slusarze8546d02008-04-17 10:38:59 -04002358 le16_add_cpu(&path->p_hdr->eh_entries, -1);
Avantika Mathur7e028972006-12-06 20:41:33 -08002359 err = ext4_ext_dirty(handle, inode, path);
2360 if (err)
Alex Tomasa86c6182006-10-11 01:21:03 -07002361 return err;
Mingming Cao2ae02102006-10-11 01:21:11 -07002362 ext_debug("index is empty, remove it, free block %llu\n", leaf);
Aditya Kalid8990242011-09-09 19:18:51 -04002363 trace_ext4_ext_rm_idx(inode, leaf);
2364
Peter Huewe7dc57612011-02-21 21:01:42 -05002365 ext4_free_blocks(handle, inode, NULL, leaf, 1,
Theodore Ts'oe6362602009-11-23 07:17:05 -05002366 EXT4_FREE_BLOCKS_METADATA | EXT4_FREE_BLOCKS_FORGET);
Forrest Liuc36575e2012-12-17 09:55:39 -05002367
2368 while (--depth >= 0) {
2369 if (path->p_idx != EXT_FIRST_INDEX(path->p_hdr))
2370 break;
2371 path--;
2372 err = ext4_ext_get_access(handle, inode, path);
2373 if (err)
2374 break;
2375 path->p_idx->ei_block = (path+1)->p_idx->ei_block;
2376 err = ext4_ext_dirty(handle, inode, path);
2377 if (err)
2378 break;
2379 }
Alex Tomasa86c6182006-10-11 01:21:03 -07002380 return err;
2381}
2382
2383/*
Mingming Caoee12b632008-08-19 22:16:05 -04002384 * ext4_ext_calc_credits_for_single_extent:
2385 * This routine returns max. credits that needed to insert an extent
2386 * to the extent tree.
2387 * When pass the actual path, the caller should calculate credits
2388 * under i_data_sem.
Alex Tomasa86c6182006-10-11 01:21:03 -07002389 */
Mingming Cao525f4ed2008-08-19 22:15:58 -04002390int ext4_ext_calc_credits_for_single_extent(struct inode *inode, int nrblocks,
Alex Tomasa86c6182006-10-11 01:21:03 -07002391 struct ext4_ext_path *path)
2392{
Alex Tomasa86c6182006-10-11 01:21:03 -07002393 if (path) {
Mingming Caoee12b632008-08-19 22:16:05 -04002394 int depth = ext_depth(inode);
Mingming Caof3bd1f32008-08-19 22:16:03 -04002395 int ret = 0;
Mingming Caoee12b632008-08-19 22:16:05 -04002396
Alex Tomasa86c6182006-10-11 01:21:03 -07002397 /* probably there is space in leaf? */
Alex Tomasa86c6182006-10-11 01:21:03 -07002398 if (le16_to_cpu(path[depth].p_hdr->eh_entries)
Mingming Caoee12b632008-08-19 22:16:05 -04002399 < le16_to_cpu(path[depth].p_hdr->eh_max)) {
2400
2401 /*
2402 * There are some space in the leaf tree, no
2403 * need to account for leaf block credit
2404 *
2405 * bitmaps and block group descriptor blocks
Tao Madf3ab172011-10-08 15:53:49 -04002406 * and other metadata blocks still need to be
Mingming Caoee12b632008-08-19 22:16:05 -04002407 * accounted.
2408 */
Mingming Cao525f4ed2008-08-19 22:15:58 -04002409 /* 1 bitmap, 1 block group descriptor */
Mingming Caoee12b632008-08-19 22:16:05 -04002410 ret = 2 + EXT4_META_TRANS_BLOCKS(inode->i_sb);
Aneesh Kumar K.V5887e982009-07-05 23:12:04 -04002411 return ret;
Mingming Caoee12b632008-08-19 22:16:05 -04002412 }
Alex Tomasa86c6182006-10-11 01:21:03 -07002413 }
2414
Mingming Cao525f4ed2008-08-19 22:15:58 -04002415 return ext4_chunk_trans_blocks(inode, nrblocks);
Mingming Caoee12b632008-08-19 22:16:05 -04002416}
Alex Tomasa86c6182006-10-11 01:21:03 -07002417
Mingming Caoee12b632008-08-19 22:16:05 -04002418/*
Jan Karafffb2732013-06-04 13:01:11 -04002419 * How many index/leaf blocks need to change/allocate to add @extents extents?
Mingming Caoee12b632008-08-19 22:16:05 -04002420 *
Jan Karafffb2732013-06-04 13:01:11 -04002421 * If we add a single extent, then in the worse case, each tree level
2422 * index/leaf need to be changed in case of the tree split.
Mingming Caoee12b632008-08-19 22:16:05 -04002423 *
Jan Karafffb2732013-06-04 13:01:11 -04002424 * If more extents are inserted, they could cause the whole tree split more
2425 * than once, but this is really rare.
Mingming Caoee12b632008-08-19 22:16:05 -04002426 */
Jan Karafffb2732013-06-04 13:01:11 -04002427int ext4_ext_index_trans_blocks(struct inode *inode, int extents)
Mingming Caoee12b632008-08-19 22:16:05 -04002428{
2429 int index;
Tao Maf19d5872012-12-10 14:05:51 -05002430 int depth;
2431
2432 /* If we are converting the inline data, only one is needed here. */
2433 if (ext4_has_inline_data(inode))
2434 return 1;
2435
2436 depth = ext_depth(inode);
Alex Tomasa86c6182006-10-11 01:21:03 -07002437
Jan Karafffb2732013-06-04 13:01:11 -04002438 if (extents <= 1)
Mingming Caoee12b632008-08-19 22:16:05 -04002439 index = depth * 2;
2440 else
2441 index = depth * 3;
Alex Tomasa86c6182006-10-11 01:21:03 -07002442
Mingming Caoee12b632008-08-19 22:16:05 -04002443 return index;
Alex Tomasa86c6182006-10-11 01:21:03 -07002444}
2445
Theodore Ts'o981250c2013-06-12 11:48:29 -04002446static inline int get_default_free_blocks_flags(struct inode *inode)
2447{
2448 if (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode))
2449 return EXT4_FREE_BLOCKS_METADATA | EXT4_FREE_BLOCKS_FORGET;
2450 else if (ext4_should_journal_data(inode))
2451 return EXT4_FREE_BLOCKS_FORGET;
2452 return 0;
2453}
2454
Alex Tomasa86c6182006-10-11 01:21:03 -07002455static int ext4_remove_blocks(handle_t *handle, struct inode *inode,
Theodore Ts'o0aa06002011-09-09 18:54:51 -04002456 struct ext4_extent *ex,
Lukas Czernerd23142c2013-05-27 23:33:35 -04002457 long long *partial_cluster,
Theodore Ts'o0aa06002011-09-09 18:54:51 -04002458 ext4_lblk_t from, ext4_lblk_t to)
Alex Tomasa86c6182006-10-11 01:21:03 -07002459{
Theodore Ts'o0aa06002011-09-09 18:54:51 -04002460 struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
Amit Aroraa2df2a62007-07-17 21:42:41 -04002461 unsigned short ee_len = ext4_ext_get_actual_len(ex);
Theodore Ts'o0aa06002011-09-09 18:54:51 -04002462 ext4_fsblk_t pblk;
Theodore Ts'o981250c2013-06-12 11:48:29 -04002463 int flags = get_default_free_blocks_flags(inode);
Andrey Sidorov18888cf2012-09-19 14:14:53 -04002464
Theodore Ts'o0aa06002011-09-09 18:54:51 -04002465 /*
2466 * For bigalloc file systems, we never free a partial cluster
2467 * at the beginning of the extent. Instead, we make a note
2468 * that we tried freeing the cluster, and check to see if we
2469 * need to free it on a subsequent call to ext4_remove_blocks,
2470 * or at the end of the ext4_truncate() operation.
2471 */
2472 flags |= EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER;
2473
Aditya Kalid8990242011-09-09 19:18:51 -04002474 trace_ext4_remove_blocks(inode, ex, from, to, *partial_cluster);
Theodore Ts'o0aa06002011-09-09 18:54:51 -04002475 /*
2476 * If we have a partial cluster, and it's different from the
2477 * cluster of the last block, we need to explicitly free the
2478 * partial cluster here.
2479 */
2480 pblk = ext4_ext_pblock(ex) + ee_len - 1;
Lukas Czernerd23142c2013-05-27 23:33:35 -04002481 if ((*partial_cluster > 0) &&
2482 (EXT4_B2C(sbi, pblk) != *partial_cluster)) {
Theodore Ts'o0aa06002011-09-09 18:54:51 -04002483 ext4_free_blocks(handle, inode, NULL,
2484 EXT4_C2B(sbi, *partial_cluster),
2485 sbi->s_cluster_ratio, flags);
2486 *partial_cluster = 0;
2487 }
2488
Alex Tomasa86c6182006-10-11 01:21:03 -07002489#ifdef EXTENTS_STATS
2490 {
2491 struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
Alex Tomasa86c6182006-10-11 01:21:03 -07002492 spin_lock(&sbi->s_ext_stats_lock);
2493 sbi->s_ext_blocks += ee_len;
2494 sbi->s_ext_extents++;
2495 if (ee_len < sbi->s_ext_min)
2496 sbi->s_ext_min = ee_len;
2497 if (ee_len > sbi->s_ext_max)
2498 sbi->s_ext_max = ee_len;
2499 if (ext_depth(inode) > sbi->s_depth_max)
2500 sbi->s_depth_max = ext_depth(inode);
2501 spin_unlock(&sbi->s_ext_stats_lock);
2502 }
2503#endif
2504 if (from >= le32_to_cpu(ex->ee_block)
Amit Aroraa2df2a62007-07-17 21:42:41 -04002505 && to == le32_to_cpu(ex->ee_block) + ee_len - 1) {
Alex Tomasa86c6182006-10-11 01:21:03 -07002506 /* tail removal */
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05002507 ext4_lblk_t num;
Lukas Czernerd23142c2013-05-27 23:33:35 -04002508 unsigned int unaligned;
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05002509
Amit Aroraa2df2a62007-07-17 21:42:41 -04002510 num = le32_to_cpu(ex->ee_block) + ee_len - from;
Theodore Ts'o0aa06002011-09-09 18:54:51 -04002511 pblk = ext4_ext_pblock(ex) + ee_len - num;
Lukas Czernerd23142c2013-05-27 23:33:35 -04002512 /*
2513 * Usually we want to free partial cluster at the end of the
2514 * extent, except for the situation when the cluster is still
2515 * used by any other extent (partial_cluster is negative).
2516 */
2517 if (*partial_cluster < 0 &&
2518 -(*partial_cluster) == EXT4_B2C(sbi, pblk + num - 1))
2519 flags |= EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER;
2520
2521 ext_debug("free last %u blocks starting %llu partial %lld\n",
2522 num, pblk, *partial_cluster);
Theodore Ts'o0aa06002011-09-09 18:54:51 -04002523 ext4_free_blocks(handle, inode, NULL, pblk, num, flags);
2524 /*
2525 * If the block range to be freed didn't start at the
2526 * beginning of a cluster, and we removed the entire
Lukas Czernerd23142c2013-05-27 23:33:35 -04002527 * extent and the cluster is not used by any other extent,
2528 * save the partial cluster here, since we might need to
2529 * delete if we determine that the truncate operation has
2530 * removed all of the blocks in the cluster.
2531 *
2532 * On the other hand, if we did not manage to free the whole
2533 * extent, we have to mark the cluster as used (store negative
2534 * cluster number in partial_cluster).
Theodore Ts'o0aa06002011-09-09 18:54:51 -04002535 */
Theodore Ts'of5a44db2013-12-20 09:29:35 -05002536 unaligned = EXT4_PBLK_COFF(sbi, pblk);
Lukas Czernerd23142c2013-05-27 23:33:35 -04002537 if (unaligned && (ee_len == num) &&
2538 (*partial_cluster != -((long long)EXT4_B2C(sbi, pblk))))
Theodore Ts'o0aa06002011-09-09 18:54:51 -04002539 *partial_cluster = EXT4_B2C(sbi, pblk);
Lukas Czernerd23142c2013-05-27 23:33:35 -04002540 else if (unaligned)
2541 *partial_cluster = -((long long)EXT4_B2C(sbi, pblk));
2542 else if (*partial_cluster > 0)
Theodore Ts'o0aa06002011-09-09 18:54:51 -04002543 *partial_cluster = 0;
Lukas Czerner78fb9cd2013-05-27 23:32:35 -04002544 } else
2545 ext4_error(sbi->s_sb, "strange request: removal(2) "
2546 "%u-%u from %u:%u\n",
2547 from, to, le32_to_cpu(ex->ee_block), ee_len);
Alex Tomasa86c6182006-10-11 01:21:03 -07002548 return 0;
2549}
2550
Allison Hendersond583fb82011-05-25 07:41:43 -04002551
2552/*
2553 * ext4_ext_rm_leaf() Removes the extents associated with the
2554 * blocks appearing between "start" and "end", and splits the extents
2555 * if "start" and "end" appear in the same extent
2556 *
2557 * @handle: The journal handle
2558 * @inode: The files inode
2559 * @path: The path to the leaf
Lukas Czernerd23142c2013-05-27 23:33:35 -04002560 * @partial_cluster: The cluster which we'll have to free if all extents
2561 * has been released from it. It gets negative in case
2562 * that the cluster is still used.
Allison Hendersond583fb82011-05-25 07:41:43 -04002563 * @start: The first block to remove
2564 * @end: The last block to remove
2565 */
Alex Tomasa86c6182006-10-11 01:21:03 -07002566static int
2567ext4_ext_rm_leaf(handle_t *handle, struct inode *inode,
Lukas Czernerd23142c2013-05-27 23:33:35 -04002568 struct ext4_ext_path *path,
2569 long long *partial_cluster,
Theodore Ts'o0aa06002011-09-09 18:54:51 -04002570 ext4_lblk_t start, ext4_lblk_t end)
Alex Tomasa86c6182006-10-11 01:21:03 -07002571{
Theodore Ts'o0aa06002011-09-09 18:54:51 -04002572 struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
Alex Tomasa86c6182006-10-11 01:21:03 -07002573 int err = 0, correct_index = 0;
2574 int depth = ext_depth(inode), credits;
2575 struct ext4_extent_header *eh;
Dmitry Monakhov750c9c42011-10-25 05:35:05 -04002576 ext4_lblk_t a, b;
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05002577 unsigned num;
2578 ext4_lblk_t ex_ee_block;
Alex Tomasa86c6182006-10-11 01:21:03 -07002579 unsigned short ex_ee_len;
Lukas Czerner556615d2014-04-20 23:45:47 -04002580 unsigned unwritten = 0;
Alex Tomasa86c6182006-10-11 01:21:03 -07002581 struct ext4_extent *ex;
Lukas Czernerd23142c2013-05-27 23:33:35 -04002582 ext4_fsblk_t pblk;
Alex Tomasa86c6182006-10-11 01:21:03 -07002583
Alex Tomasc29c0ae2007-07-18 09:19:09 -04002584 /* the header must be checked already in ext4_ext_remove_space() */
Lukas Czerner5f95d212012-03-19 23:03:19 -04002585 ext_debug("truncate since %u in leaf to %u\n", start, end);
Alex Tomasa86c6182006-10-11 01:21:03 -07002586 if (!path[depth].p_hdr)
2587 path[depth].p_hdr = ext_block_hdr(path[depth].p_bh);
2588 eh = path[depth].p_hdr;
Frank Mayhar273df552010-03-02 11:46:09 -05002589 if (unlikely(path[depth].p_hdr == NULL)) {
2590 EXT4_ERROR_INODE(inode, "path[%d].p_hdr == NULL", depth);
2591 return -EIO;
2592 }
Alex Tomasa86c6182006-10-11 01:21:03 -07002593 /* find where to start removing */
Ashish Sangwan6ae06ff2013-07-01 08:12:41 -04002594 ex = path[depth].p_ext;
2595 if (!ex)
2596 ex = EXT_LAST_EXTENT(eh);
Alex Tomasa86c6182006-10-11 01:21:03 -07002597
2598 ex_ee_block = le32_to_cpu(ex->ee_block);
Amit Aroraa2df2a62007-07-17 21:42:41 -04002599 ex_ee_len = ext4_ext_get_actual_len(ex);
Alex Tomasa86c6182006-10-11 01:21:03 -07002600
Eric Whitneyc0634492014-03-13 23:34:16 -04002601 /*
2602 * If we're starting with an extent other than the last one in the
2603 * node, we need to see if it shares a cluster with the extent to
2604 * the right (towards the end of the file). If its leftmost cluster
2605 * is this extent's rightmost cluster and it is not cluster aligned,
2606 * we'll mark it as a partial that is not to be deallocated.
2607 */
2608
2609 if (ex != EXT_LAST_EXTENT(eh)) {
2610 ext4_fsblk_t current_pblk, right_pblk;
2611 long long current_cluster, right_cluster;
2612
2613 current_pblk = ext4_ext_pblock(ex) + ex_ee_len - 1;
2614 current_cluster = (long long)EXT4_B2C(sbi, current_pblk);
2615 right_pblk = ext4_ext_pblock(ex + 1);
2616 right_cluster = (long long)EXT4_B2C(sbi, right_pblk);
2617 if (current_cluster == right_cluster &&
2618 EXT4_PBLK_COFF(sbi, right_pblk))
2619 *partial_cluster = -right_cluster;
2620 }
2621
Aditya Kalid8990242011-09-09 19:18:51 -04002622 trace_ext4_ext_rm_leaf(inode, start, ex, *partial_cluster);
2623
Alex Tomasa86c6182006-10-11 01:21:03 -07002624 while (ex >= EXT_FIRST_EXTENT(eh) &&
2625 ex_ee_block + ex_ee_len > start) {
Aneesh Kumar K.Va41f2072009-06-10 14:22:55 -04002626
Lukas Czerner556615d2014-04-20 23:45:47 -04002627 if (ext4_ext_is_unwritten(ex))
2628 unwritten = 1;
Aneesh Kumar K.Va41f2072009-06-10 14:22:55 -04002629 else
Lukas Czerner556615d2014-04-20 23:45:47 -04002630 unwritten = 0;
Aneesh Kumar K.Va41f2072009-06-10 14:22:55 -04002631
Mingming553f9002009-09-18 13:34:55 -04002632 ext_debug("remove ext %u:[%d]%d\n", ex_ee_block,
Lukas Czerner556615d2014-04-20 23:45:47 -04002633 unwritten, ex_ee_len);
Alex Tomasa86c6182006-10-11 01:21:03 -07002634 path[depth].p_ext = ex;
2635
2636 a = ex_ee_block > start ? ex_ee_block : start;
Allison Hendersond583fb82011-05-25 07:41:43 -04002637 b = ex_ee_block+ex_ee_len - 1 < end ?
2638 ex_ee_block+ex_ee_len - 1 : end;
Alex Tomasa86c6182006-10-11 01:21:03 -07002639
2640 ext_debug(" border %u:%u\n", a, b);
2641
Allison Hendersond583fb82011-05-25 07:41:43 -04002642 /* If this extent is beyond the end of the hole, skip it */
Lukas Czerner5f95d212012-03-19 23:03:19 -04002643 if (end < ex_ee_block) {
Lukas Czernerd23142c2013-05-27 23:33:35 -04002644 /*
2645 * We're going to skip this extent and move to another,
2646 * so if this extent is not cluster aligned we have
2647 * to mark the current cluster as used to avoid
2648 * accidentally freeing it later on
2649 */
2650 pblk = ext4_ext_pblock(ex);
Theodore Ts'of5a44db2013-12-20 09:29:35 -05002651 if (EXT4_PBLK_COFF(sbi, pblk))
Lukas Czernerd23142c2013-05-27 23:33:35 -04002652 *partial_cluster =
2653 -((long long)EXT4_B2C(sbi, pblk));
Allison Hendersond583fb82011-05-25 07:41:43 -04002654 ex--;
2655 ex_ee_block = le32_to_cpu(ex->ee_block);
2656 ex_ee_len = ext4_ext_get_actual_len(ex);
2657 continue;
Dmitry Monakhov750c9c42011-10-25 05:35:05 -04002658 } else if (b != ex_ee_block + ex_ee_len - 1) {
Lukas Czernerdc1841d2012-03-19 23:07:43 -04002659 EXT4_ERROR_INODE(inode,
2660 "can not handle truncate %u:%u "
2661 "on extent %u:%u",
2662 start, end, ex_ee_block,
2663 ex_ee_block + ex_ee_len - 1);
Dmitry Monakhov750c9c42011-10-25 05:35:05 -04002664 err = -EIO;
2665 goto out;
Alex Tomasa86c6182006-10-11 01:21:03 -07002666 } else if (a != ex_ee_block) {
2667 /* remove tail of the extent */
Dmitry Monakhov750c9c42011-10-25 05:35:05 -04002668 num = a - ex_ee_block;
Alex Tomasa86c6182006-10-11 01:21:03 -07002669 } else {
2670 /* remove whole extent: excellent! */
Alex Tomasa86c6182006-10-11 01:21:03 -07002671 num = 0;
Alex Tomasa86c6182006-10-11 01:21:03 -07002672 }
Theodore Ts'o34071da2008-08-01 21:59:19 -04002673 /*
2674 * 3 for leaf, sb, and inode plus 2 (bmap and group
2675 * descriptor) for each block group; assume two block
2676 * groups plus ex_ee_len/blocks_per_block_group for
2677 * the worst case
2678 */
2679 credits = 7 + 2*(ex_ee_len/EXT4_BLOCKS_PER_GROUP(inode->i_sb));
Alex Tomasa86c6182006-10-11 01:21:03 -07002680 if (ex == EXT_FIRST_EXTENT(eh)) {
2681 correct_index = 1;
2682 credits += (ext_depth(inode)) + 1;
2683 }
Dmitry Monakhov5aca07e2009-12-08 22:42:15 -05002684 credits += EXT4_MAXQUOTAS_TRANS_BLOCKS(inode->i_sb);
Alex Tomasa86c6182006-10-11 01:21:03 -07002685
Jan Kara487caee2009-08-17 22:17:20 -04002686 err = ext4_ext_truncate_extend_restart(handle, inode, credits);
Shen Feng9102e4f2008-07-11 19:27:31 -04002687 if (err)
Alex Tomasa86c6182006-10-11 01:21:03 -07002688 goto out;
Alex Tomasa86c6182006-10-11 01:21:03 -07002689
2690 err = ext4_ext_get_access(handle, inode, path + depth);
2691 if (err)
2692 goto out;
2693
Theodore Ts'o0aa06002011-09-09 18:54:51 -04002694 err = ext4_remove_blocks(handle, inode, ex, partial_cluster,
2695 a, b);
Alex Tomasa86c6182006-10-11 01:21:03 -07002696 if (err)
2697 goto out;
2698
Dmitry Monakhov750c9c42011-10-25 05:35:05 -04002699 if (num == 0)
Randy Dunlapd0d856e2006-10-11 01:21:07 -07002700 /* this extent is removed; mark slot entirely unused */
Alex Tomasf65e6fb2006-10-11 01:21:05 -07002701 ext4_ext_store_pblock(ex, 0);
Alex Tomasa86c6182006-10-11 01:21:03 -07002702
Alex Tomasa86c6182006-10-11 01:21:03 -07002703 ex->ee_len = cpu_to_le16(num);
Amit Arora749269f2007-07-18 09:02:56 -04002704 /*
Lukas Czerner556615d2014-04-20 23:45:47 -04002705 * Do not mark unwritten if all the blocks in the
Amit Arora749269f2007-07-18 09:02:56 -04002706 * extent have been removed.
2707 */
Lukas Czerner556615d2014-04-20 23:45:47 -04002708 if (unwritten && num)
2709 ext4_ext_mark_unwritten(ex);
Allison Hendersond583fb82011-05-25 07:41:43 -04002710 /*
2711 * If the extent was completely released,
2712 * we need to remove it from the leaf
2713 */
2714 if (num == 0) {
Lukas Czernerf17722f2011-06-06 00:05:17 -04002715 if (end != EXT_MAX_BLOCKS - 1) {
Allison Hendersond583fb82011-05-25 07:41:43 -04002716 /*
2717 * For hole punching, we need to scoot all the
2718 * extents up when an extent is removed so that
2719 * we dont have blank extents in the middle
2720 */
2721 memmove(ex, ex+1, (EXT_LAST_EXTENT(eh) - ex) *
2722 sizeof(struct ext4_extent));
2723
2724 /* Now get rid of the one at the end */
2725 memset(EXT_LAST_EXTENT(eh), 0,
2726 sizeof(struct ext4_extent));
2727 }
2728 le16_add_cpu(&eh->eh_entries, -1);
Lukas Czernerd23142c2013-05-27 23:33:35 -04002729 } else if (*partial_cluster > 0)
Theodore Ts'o0aa06002011-09-09 18:54:51 -04002730 *partial_cluster = 0;
Allison Hendersond583fb82011-05-25 07:41:43 -04002731
Dmitry Monakhov750c9c42011-10-25 05:35:05 -04002732 err = ext4_ext_dirty(handle, inode, path + depth);
2733 if (err)
2734 goto out;
2735
Yongqiang Yangbf52c6f2011-11-01 18:59:26 -04002736 ext_debug("new extent: %u:%u:%llu\n", ex_ee_block, num,
Theodore Ts'obf89d162010-10-27 21:30:14 -04002737 ext4_ext_pblock(ex));
Alex Tomasa86c6182006-10-11 01:21:03 -07002738 ex--;
2739 ex_ee_block = le32_to_cpu(ex->ee_block);
Amit Aroraa2df2a62007-07-17 21:42:41 -04002740 ex_ee_len = ext4_ext_get_actual_len(ex);
Alex Tomasa86c6182006-10-11 01:21:03 -07002741 }
2742
2743 if (correct_index && eh->eh_entries)
2744 err = ext4_ext_correct_indexes(handle, inode, path);
2745
Theodore Ts'o0aa06002011-09-09 18:54:51 -04002746 /*
Eric Whitneyad6599a2014-04-01 19:49:30 -04002747 * If there's a partial cluster and at least one extent remains in
2748 * the leaf, free the partial cluster if it isn't shared with the
2749 * current extent. If there's a partial cluster and no extents
2750 * remain in the leaf, it can't be freed here. It can only be
2751 * freed when it's possible to determine if it's not shared with
2752 * any other extent - when the next leaf is processed or when space
2753 * removal is complete.
Theodore Ts'o0aa06002011-09-09 18:54:51 -04002754 */
Eric Whitneyad6599a2014-04-01 19:49:30 -04002755 if (*partial_cluster > 0 && eh->eh_entries &&
Theodore Ts'o0aa06002011-09-09 18:54:51 -04002756 (EXT4_B2C(sbi, ext4_ext_pblock(ex) + ex_ee_len - 1) !=
2757 *partial_cluster)) {
Theodore Ts'o981250c2013-06-12 11:48:29 -04002758 int flags = get_default_free_blocks_flags(inode);
Theodore Ts'o0aa06002011-09-09 18:54:51 -04002759
2760 ext4_free_blocks(handle, inode, NULL,
2761 EXT4_C2B(sbi, *partial_cluster),
2762 sbi->s_cluster_ratio, flags);
2763 *partial_cluster = 0;
2764 }
2765
Alex Tomasa86c6182006-10-11 01:21:03 -07002766 /* if this leaf is free, then we should
2767 * remove it from index block above */
2768 if (err == 0 && eh->eh_entries == 0 && path[depth].p_bh != NULL)
Forrest Liuc36575e2012-12-17 09:55:39 -05002769 err = ext4_ext_rm_idx(handle, inode, path, depth);
Alex Tomasa86c6182006-10-11 01:21:03 -07002770
2771out:
2772 return err;
2773}
2774
2775/*
Randy Dunlapd0d856e2006-10-11 01:21:07 -07002776 * ext4_ext_more_to_rm:
2777 * returns 1 if current index has to be freed (even partial)
Alex Tomasa86c6182006-10-11 01:21:03 -07002778 */
Avantika Mathur09b88252006-12-06 20:41:36 -08002779static int
Alex Tomasa86c6182006-10-11 01:21:03 -07002780ext4_ext_more_to_rm(struct ext4_ext_path *path)
2781{
2782 BUG_ON(path->p_idx == NULL);
2783
2784 if (path->p_idx < EXT_FIRST_INDEX(path->p_hdr))
2785 return 0;
2786
2787 /*
Randy Dunlapd0d856e2006-10-11 01:21:07 -07002788 * if truncate on deeper level happened, it wasn't partial,
Alex Tomasa86c6182006-10-11 01:21:03 -07002789 * so we have to consider current index for truncation
2790 */
2791 if (le16_to_cpu(path->p_hdr->eh_entries) == path->p_block)
2792 return 0;
2793 return 1;
2794}
2795
Theodore Ts'o26a4c0c2013-04-03 12:45:17 -04002796int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start,
2797 ext4_lblk_t end)
Alex Tomasa86c6182006-10-11 01:21:03 -07002798{
2799 struct super_block *sb = inode->i_sb;
2800 int depth = ext_depth(inode);
Ashish Sangwan968dee72012-07-22 22:49:08 -04002801 struct ext4_ext_path *path = NULL;
Lukas Czernerd23142c2013-05-27 23:33:35 -04002802 long long partial_cluster = 0;
Alex Tomasa86c6182006-10-11 01:21:03 -07002803 handle_t *handle;
Dmitry Monakhov6f2080e2012-09-30 23:03:50 -04002804 int i = 0, err = 0;
Alex Tomasa86c6182006-10-11 01:21:03 -07002805
Lukas Czerner5f95d212012-03-19 23:03:19 -04002806 ext_debug("truncate since %u to %u\n", start, end);
Alex Tomasa86c6182006-10-11 01:21:03 -07002807
2808 /* probably first extent we're gonna free will be last in block */
Theodore Ts'o9924a922013-02-08 21:59:22 -05002809 handle = ext4_journal_start(inode, EXT4_HT_TRUNCATE, depth + 1);
Alex Tomasa86c6182006-10-11 01:21:03 -07002810 if (IS_ERR(handle))
2811 return PTR_ERR(handle);
2812
Dmitry Monakhov0617b832010-05-17 01:00:00 -04002813again:
Lukas Czerner61801322013-05-27 23:32:35 -04002814 trace_ext4_ext_remove_space(inode, start, end, depth);
Aditya Kalid8990242011-09-09 19:18:51 -04002815
Alex Tomasa86c6182006-10-11 01:21:03 -07002816 /*
Lukas Czerner5f95d212012-03-19 23:03:19 -04002817 * Check if we are removing extents inside the extent tree. If that
2818 * is the case, we are going to punch a hole inside the extent tree
2819 * so we have to check whether we need to split the extent covering
2820 * the last block to remove so we can easily remove the part of it
2821 * in ext4_ext_rm_leaf().
2822 */
2823 if (end < EXT_MAX_BLOCKS - 1) {
2824 struct ext4_extent *ex;
2825 ext4_lblk_t ee_block;
2826
2827 /* find extent for this block */
Theodore Ts'o107a7bd2013-08-16 21:23:41 -04002828 path = ext4_ext_find_extent(inode, end, NULL, EXT4_EX_NOCACHE);
Lukas Czerner5f95d212012-03-19 23:03:19 -04002829 if (IS_ERR(path)) {
2830 ext4_journal_stop(handle);
2831 return PTR_ERR(path);
2832 }
2833 depth = ext_depth(inode);
Dmitry Monakhov6f2080e2012-09-30 23:03:50 -04002834 /* Leaf not may not exist only if inode has no blocks at all */
Lukas Czerner5f95d212012-03-19 23:03:19 -04002835 ex = path[depth].p_ext;
Ashish Sangwan968dee72012-07-22 22:49:08 -04002836 if (!ex) {
Dmitry Monakhov6f2080e2012-09-30 23:03:50 -04002837 if (depth) {
2838 EXT4_ERROR_INODE(inode,
2839 "path[%d].p_hdr == NULL",
2840 depth);
2841 err = -EIO;
2842 }
2843 goto out;
Ashish Sangwan968dee72012-07-22 22:49:08 -04002844 }
Lukas Czerner5f95d212012-03-19 23:03:19 -04002845
2846 ee_block = le32_to_cpu(ex->ee_block);
2847
2848 /*
2849 * See if the last block is inside the extent, if so split
2850 * the extent at 'end' block so we can easily remove the
2851 * tail of the first part of the split extent in
2852 * ext4_ext_rm_leaf().
2853 */
2854 if (end >= ee_block &&
2855 end < ee_block + ext4_ext_get_actual_len(ex) - 1) {
2856 int split_flag = 0;
2857
Lukas Czerner556615d2014-04-20 23:45:47 -04002858 if (ext4_ext_is_unwritten(ex))
2859 split_flag = EXT4_EXT_MARK_UNWRIT1 |
2860 EXT4_EXT_MARK_UNWRIT2;
Lukas Czerner5f95d212012-03-19 23:03:19 -04002861
2862 /*
2863 * Split the extent in two so that 'end' is the last
Lukas Czerner27dd4382013-04-09 22:11:22 -04002864 * block in the first new extent. Also we should not
2865 * fail removing space due to ENOSPC so try to use
2866 * reserved block if that happens.
Lukas Czerner5f95d212012-03-19 23:03:19 -04002867 */
2868 err = ext4_split_extent_at(handle, inode, path,
Lukas Czerner27dd4382013-04-09 22:11:22 -04002869 end + 1, split_flag,
Theodore Ts'o107a7bd2013-08-16 21:23:41 -04002870 EXT4_EX_NOCACHE |
Lukas Czerner27dd4382013-04-09 22:11:22 -04002871 EXT4_GET_BLOCKS_PRE_IO |
2872 EXT4_GET_BLOCKS_METADATA_NOFAIL);
Lukas Czerner5f95d212012-03-19 23:03:19 -04002873
2874 if (err < 0)
2875 goto out;
2876 }
Lukas Czerner5f95d212012-03-19 23:03:19 -04002877 }
Lukas Czerner5f95d212012-03-19 23:03:19 -04002878 /*
Randy Dunlapd0d856e2006-10-11 01:21:07 -07002879 * We start scanning from right side, freeing all the blocks
2880 * after i_size and walking into the tree depth-wise.
Alex Tomasa86c6182006-10-11 01:21:03 -07002881 */
Dmitry Monakhov0617b832010-05-17 01:00:00 -04002882 depth = ext_depth(inode);
Ashish Sangwan968dee72012-07-22 22:49:08 -04002883 if (path) {
2884 int k = i = depth;
2885 while (--k > 0)
2886 path[k].p_block =
2887 le16_to_cpu(path[k].p_hdr->eh_entries)+1;
2888 } else {
2889 path = kzalloc(sizeof(struct ext4_ext_path) * (depth + 1),
2890 GFP_NOFS);
2891 if (path == NULL) {
2892 ext4_journal_stop(handle);
2893 return -ENOMEM;
2894 }
2895 path[0].p_depth = depth;
2896 path[0].p_hdr = ext_inode_hdr(inode);
Theodore Ts'o89a4e482012-08-17 08:54:52 -04002897 i = 0;
Lukas Czerner5f95d212012-03-19 23:03:19 -04002898
Theodore Ts'oc3491792013-08-16 21:21:41 -04002899 if (ext4_ext_check(inode, path[0].p_hdr, depth, 0)) {
Ashish Sangwan968dee72012-07-22 22:49:08 -04002900 err = -EIO;
2901 goto out;
2902 }
Alex Tomasa86c6182006-10-11 01:21:03 -07002903 }
Ashish Sangwan968dee72012-07-22 22:49:08 -04002904 err = 0;
Alex Tomasa86c6182006-10-11 01:21:03 -07002905
2906 while (i >= 0 && err == 0) {
2907 if (i == depth) {
2908 /* this is leaf block */
Allison Hendersond583fb82011-05-25 07:41:43 -04002909 err = ext4_ext_rm_leaf(handle, inode, path,
Theodore Ts'o0aa06002011-09-09 18:54:51 -04002910 &partial_cluster, start,
Lukas Czerner5f95d212012-03-19 23:03:19 -04002911 end);
Randy Dunlapd0d856e2006-10-11 01:21:07 -07002912 /* root level has p_bh == NULL, brelse() eats this */
Alex Tomasa86c6182006-10-11 01:21:03 -07002913 brelse(path[i].p_bh);
2914 path[i].p_bh = NULL;
2915 i--;
2916 continue;
2917 }
2918
2919 /* this is index block */
2920 if (!path[i].p_hdr) {
2921 ext_debug("initialize header\n");
2922 path[i].p_hdr = ext_block_hdr(path[i].p_bh);
Alex Tomasa86c6182006-10-11 01:21:03 -07002923 }
2924
Alex Tomasa86c6182006-10-11 01:21:03 -07002925 if (!path[i].p_idx) {
Randy Dunlapd0d856e2006-10-11 01:21:07 -07002926 /* this level hasn't been touched yet */
Alex Tomasa86c6182006-10-11 01:21:03 -07002927 path[i].p_idx = EXT_LAST_INDEX(path[i].p_hdr);
2928 path[i].p_block = le16_to_cpu(path[i].p_hdr->eh_entries)+1;
2929 ext_debug("init index ptr: hdr 0x%p, num %d\n",
2930 path[i].p_hdr,
2931 le16_to_cpu(path[i].p_hdr->eh_entries));
2932 } else {
Randy Dunlapd0d856e2006-10-11 01:21:07 -07002933 /* we were already here, see at next index */
Alex Tomasa86c6182006-10-11 01:21:03 -07002934 path[i].p_idx--;
2935 }
2936
2937 ext_debug("level %d - index, first 0x%p, cur 0x%p\n",
2938 i, EXT_FIRST_INDEX(path[i].p_hdr),
2939 path[i].p_idx);
2940 if (ext4_ext_more_to_rm(path + i)) {
Alex Tomasc29c0ae2007-07-18 09:19:09 -04002941 struct buffer_head *bh;
Alex Tomasa86c6182006-10-11 01:21:03 -07002942 /* go to the next level */
Mingming Cao2ae02102006-10-11 01:21:11 -07002943 ext_debug("move to level %d (block %llu)\n",
Theodore Ts'obf89d162010-10-27 21:30:14 -04002944 i + 1, ext4_idx_pblock(path[i].p_idx));
Alex Tomasa86c6182006-10-11 01:21:03 -07002945 memset(path + i + 1, 0, sizeof(*path));
Theodore Ts'o7d7ea892013-08-16 21:20:41 -04002946 bh = read_extent_tree_block(inode,
Theodore Ts'o107a7bd2013-08-16 21:23:41 -04002947 ext4_idx_pblock(path[i].p_idx), depth - i - 1,
2948 EXT4_EX_NOCACHE);
Theodore Ts'o7d7ea892013-08-16 21:20:41 -04002949 if (IS_ERR(bh)) {
Alex Tomasa86c6182006-10-11 01:21:03 -07002950 /* should we reset i_size? */
Theodore Ts'o7d7ea892013-08-16 21:20:41 -04002951 err = PTR_ERR(bh);
Alex Tomasa86c6182006-10-11 01:21:03 -07002952 break;
2953 }
Theodore Ts'o76828c82013-07-15 12:27:47 -04002954 /* Yield here to deal with large extent trees.
2955 * Should be a no-op if we did IO above. */
2956 cond_resched();
Alex Tomasc29c0ae2007-07-18 09:19:09 -04002957 if (WARN_ON(i + 1 > depth)) {
2958 err = -EIO;
2959 break;
2960 }
Alex Tomasc29c0ae2007-07-18 09:19:09 -04002961 path[i + 1].p_bh = bh;
Alex Tomasa86c6182006-10-11 01:21:03 -07002962
Randy Dunlapd0d856e2006-10-11 01:21:07 -07002963 /* save actual number of indexes since this
2964 * number is changed at the next iteration */
Alex Tomasa86c6182006-10-11 01:21:03 -07002965 path[i].p_block = le16_to_cpu(path[i].p_hdr->eh_entries);
2966 i++;
2967 } else {
Randy Dunlapd0d856e2006-10-11 01:21:07 -07002968 /* we finished processing this index, go up */
Alex Tomasa86c6182006-10-11 01:21:03 -07002969 if (path[i].p_hdr->eh_entries == 0 && i > 0) {
Randy Dunlapd0d856e2006-10-11 01:21:07 -07002970 /* index is empty, remove it;
Alex Tomasa86c6182006-10-11 01:21:03 -07002971 * handle must be already prepared by the
2972 * truncatei_leaf() */
Forrest Liuc36575e2012-12-17 09:55:39 -05002973 err = ext4_ext_rm_idx(handle, inode, path, i);
Alex Tomasa86c6182006-10-11 01:21:03 -07002974 }
Randy Dunlapd0d856e2006-10-11 01:21:07 -07002975 /* root level has p_bh == NULL, brelse() eats this */
Alex Tomasa86c6182006-10-11 01:21:03 -07002976 brelse(path[i].p_bh);
2977 path[i].p_bh = NULL;
2978 i--;
2979 ext_debug("return to level %d\n", i);
2980 }
2981 }
2982
Lukas Czerner61801322013-05-27 23:32:35 -04002983 trace_ext4_ext_remove_space_done(inode, start, end, depth,
2984 partial_cluster, path->p_hdr->eh_entries);
Aditya Kalid8990242011-09-09 19:18:51 -04002985
Aditya Kali7b415bf2011-09-09 19:04:51 -04002986 /* If we still have something in the partial cluster and we have removed
2987 * even the first extent, then we should free the blocks in the partial
2988 * cluster as well. */
Lukas Czernerd23142c2013-05-27 23:33:35 -04002989 if (partial_cluster > 0 && path->p_hdr->eh_entries == 0) {
Theodore Ts'o981250c2013-06-12 11:48:29 -04002990 int flags = get_default_free_blocks_flags(inode);
Aditya Kali7b415bf2011-09-09 19:04:51 -04002991
2992 ext4_free_blocks(handle, inode, NULL,
2993 EXT4_C2B(EXT4_SB(sb), partial_cluster),
2994 EXT4_SB(sb)->s_cluster_ratio, flags);
2995 partial_cluster = 0;
2996 }
2997
Alex Tomasa86c6182006-10-11 01:21:03 -07002998 /* TODO: flexible tree reduction should be here */
2999 if (path->p_hdr->eh_entries == 0) {
3000 /*
Randy Dunlapd0d856e2006-10-11 01:21:07 -07003001 * truncate to zero freed all the tree,
3002 * so we need to correct eh_depth
Alex Tomasa86c6182006-10-11 01:21:03 -07003003 */
3004 err = ext4_ext_get_access(handle, inode, path);
3005 if (err == 0) {
3006 ext_inode_hdr(inode)->eh_depth = 0;
3007 ext_inode_hdr(inode)->eh_max =
Theodore Ts'o55ad63b2009-08-28 10:40:33 -04003008 cpu_to_le16(ext4_ext_space_root(inode, 0));
Alex Tomasa86c6182006-10-11 01:21:03 -07003009 err = ext4_ext_dirty(handle, inode, path);
3010 }
3011 }
3012out:
Alex Tomasa86c6182006-10-11 01:21:03 -07003013 ext4_ext_drop_refs(path);
3014 kfree(path);
Ashish Sangwan968dee72012-07-22 22:49:08 -04003015 if (err == -EAGAIN) {
3016 path = NULL;
Dmitry Monakhov0617b832010-05-17 01:00:00 -04003017 goto again;
Ashish Sangwan968dee72012-07-22 22:49:08 -04003018 }
Alex Tomasa86c6182006-10-11 01:21:03 -07003019 ext4_journal_stop(handle);
3020
3021 return err;
3022}
3023
3024/*
3025 * called at mount time
3026 */
3027void ext4_ext_init(struct super_block *sb)
3028{
3029 /*
3030 * possible initialization would be here
3031 */
3032
Theodore Ts'o83982b62009-01-06 14:53:16 -05003033 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS)) {
Theodore Ts'o90576c02009-09-29 15:51:30 -04003034#if defined(AGGRESSIVE_TEST) || defined(CHECK_BINSEARCH) || defined(EXTENTS_STATS)
Theodore Ts'o92b97812012-03-19 23:41:49 -04003035 printk(KERN_INFO "EXT4-fs: file extents enabled"
Robert P. J. Daybbf2f9f2007-02-17 19:20:16 +01003036#ifdef AGGRESSIVE_TEST
Theodore Ts'o92b97812012-03-19 23:41:49 -04003037 ", aggressive tests"
Alex Tomasa86c6182006-10-11 01:21:03 -07003038#endif
3039#ifdef CHECK_BINSEARCH
Theodore Ts'o92b97812012-03-19 23:41:49 -04003040 ", check binsearch"
Alex Tomasa86c6182006-10-11 01:21:03 -07003041#endif
3042#ifdef EXTENTS_STATS
Theodore Ts'o92b97812012-03-19 23:41:49 -04003043 ", stats"
Alex Tomasa86c6182006-10-11 01:21:03 -07003044#endif
Theodore Ts'o92b97812012-03-19 23:41:49 -04003045 "\n");
Theodore Ts'o90576c02009-09-29 15:51:30 -04003046#endif
Alex Tomasa86c6182006-10-11 01:21:03 -07003047#ifdef EXTENTS_STATS
3048 spin_lock_init(&EXT4_SB(sb)->s_ext_stats_lock);
3049 EXT4_SB(sb)->s_ext_min = 1 << 30;
3050 EXT4_SB(sb)->s_ext_max = 0;
3051#endif
3052 }
3053}
3054
3055/*
3056 * called at umount time
3057 */
3058void ext4_ext_release(struct super_block *sb)
3059{
Theodore Ts'o83982b62009-01-06 14:53:16 -05003060 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS))
Alex Tomasa86c6182006-10-11 01:21:03 -07003061 return;
3062
3063#ifdef EXTENTS_STATS
3064 if (EXT4_SB(sb)->s_ext_blocks && EXT4_SB(sb)->s_ext_extents) {
3065 struct ext4_sb_info *sbi = EXT4_SB(sb);
3066 printk(KERN_ERR "EXT4-fs: %lu blocks in %lu extents (%lu ave)\n",
3067 sbi->s_ext_blocks, sbi->s_ext_extents,
3068 sbi->s_ext_blocks / sbi->s_ext_extents);
3069 printk(KERN_ERR "EXT4-fs: extents: %lu min, %lu max, max depth %lu\n",
3070 sbi->s_ext_min, sbi->s_ext_max, sbi->s_depth_max);
3071 }
3072#endif
3073}
3074
Zheng Liud7b2a002013-08-28 14:47:06 -04003075static int ext4_zeroout_es(struct inode *inode, struct ext4_extent *ex)
3076{
3077 ext4_lblk_t ee_block;
3078 ext4_fsblk_t ee_pblock;
3079 unsigned int ee_len;
3080
3081 ee_block = le32_to_cpu(ex->ee_block);
3082 ee_len = ext4_ext_get_actual_len(ex);
3083 ee_pblock = ext4_ext_pblock(ex);
3084
3085 if (ee_len == 0)
3086 return 0;
3087
3088 return ext4_es_insert_extent(inode, ee_block, ee_len, ee_pblock,
3089 EXTENT_STATUS_WRITTEN);
3090}
3091
Aneesh Kumar K.V093a0882008-04-29 08:11:12 -04003092/* FIXME!! we need to try to merge to left or right after zero-out */
3093static int ext4_ext_zeroout(struct inode *inode, struct ext4_extent *ex)
3094{
Lukas Czerner24075182010-10-27 21:30:06 -04003095 ext4_fsblk_t ee_pblock;
3096 unsigned int ee_len;
Jing Zhangb7203032010-05-12 00:00:00 -04003097 int ret;
Aneesh Kumar K.V093a0882008-04-29 08:11:12 -04003098
Aneesh Kumar K.V093a0882008-04-29 08:11:12 -04003099 ee_len = ext4_ext_get_actual_len(ex);
Theodore Ts'obf89d162010-10-27 21:30:14 -04003100 ee_pblock = ext4_ext_pblock(ex);
Aneesh Kumar K.V093a0882008-04-29 08:11:12 -04003101
Theodore Ts'oa107e5a2010-10-27 23:44:47 -04003102 ret = sb_issue_zeroout(inode->i_sb, ee_pblock, ee_len, GFP_NOFS);
Lukas Czerner24075182010-10-27 21:30:06 -04003103 if (ret > 0)
3104 ret = 0;
Aneesh Kumar K.V093a0882008-04-29 08:11:12 -04003105
Lukas Czerner24075182010-10-27 21:30:06 -04003106 return ret;
Aneesh Kumar K.V093a0882008-04-29 08:11:12 -04003107}
3108
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003109/*
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003110 * ext4_split_extent_at() splits an extent at given block.
3111 *
3112 * @handle: the journal handle
3113 * @inode: the file inode
3114 * @path: the path to the extent
3115 * @split: the logical block where the extent is splitted.
3116 * @split_flags: indicates if the extent could be zeroout if split fails, and
Lukas Czerner556615d2014-04-20 23:45:47 -04003117 * the states(init or unwritten) of new extents.
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003118 * @flags: flags used to insert new extent to extent tree.
3119 *
3120 *
3121 * Splits extent [a, b] into two extents [a, @split) and [@split, b], states
3122 * of which are deterimined by split_flag.
3123 *
3124 * There are two cases:
3125 * a> the extent are splitted into two extent.
3126 * b> split is not needed, and just mark the extent.
3127 *
3128 * return 0 on success.
3129 */
3130static int ext4_split_extent_at(handle_t *handle,
3131 struct inode *inode,
3132 struct ext4_ext_path *path,
3133 ext4_lblk_t split,
3134 int split_flag,
3135 int flags)
3136{
3137 ext4_fsblk_t newblock;
3138 ext4_lblk_t ee_block;
Zheng Liuadb23552013-03-10 21:13:05 -04003139 struct ext4_extent *ex, newex, orig_ex, zero_ex;
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003140 struct ext4_extent *ex2 = NULL;
3141 unsigned int ee_len, depth;
3142 int err = 0;
3143
Dmitry Monakhovdee1f972012-10-10 01:04:58 -04003144 BUG_ON((split_flag & (EXT4_EXT_DATA_VALID1 | EXT4_EXT_DATA_VALID2)) ==
3145 (EXT4_EXT_DATA_VALID1 | EXT4_EXT_DATA_VALID2));
3146
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003147 ext_debug("ext4_split_extents_at: inode %lu, logical"
3148 "block %llu\n", inode->i_ino, (unsigned long long)split);
3149
3150 ext4_ext_show_leaf(inode, path);
3151
3152 depth = ext_depth(inode);
3153 ex = path[depth].p_ext;
3154 ee_block = le32_to_cpu(ex->ee_block);
3155 ee_len = ext4_ext_get_actual_len(ex);
3156 newblock = split - ee_block + ext4_ext_pblock(ex);
3157
3158 BUG_ON(split < ee_block || split >= (ee_block + ee_len));
Lukas Czerner556615d2014-04-20 23:45:47 -04003159 BUG_ON(!ext4_ext_is_unwritten(ex) &&
Dmitry Monakhov357b66f2013-03-04 00:34:34 -05003160 split_flag & (EXT4_EXT_MAY_ZEROOUT |
Lukas Czerner556615d2014-04-20 23:45:47 -04003161 EXT4_EXT_MARK_UNWRIT1 |
3162 EXT4_EXT_MARK_UNWRIT2));
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003163
3164 err = ext4_ext_get_access(handle, inode, path + depth);
3165 if (err)
3166 goto out;
3167
3168 if (split == ee_block) {
3169 /*
3170 * case b: block @split is the block that the extent begins with
3171 * then we just change the state of the extent, and splitting
3172 * is not needed.
3173 */
Lukas Czerner556615d2014-04-20 23:45:47 -04003174 if (split_flag & EXT4_EXT_MARK_UNWRIT2)
3175 ext4_ext_mark_unwritten(ex);
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003176 else
3177 ext4_ext_mark_initialized(ex);
3178
3179 if (!(flags & EXT4_GET_BLOCKS_PRE_IO))
Theodore Ts'oecb94f52012-08-17 09:44:17 -04003180 ext4_ext_try_to_merge(handle, inode, path, ex);
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003181
Theodore Ts'oecb94f52012-08-17 09:44:17 -04003182 err = ext4_ext_dirty(handle, inode, path + path->p_depth);
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003183 goto out;
3184 }
3185
3186 /* case a */
3187 memcpy(&orig_ex, ex, sizeof(orig_ex));
3188 ex->ee_len = cpu_to_le16(split - ee_block);
Lukas Czerner556615d2014-04-20 23:45:47 -04003189 if (split_flag & EXT4_EXT_MARK_UNWRIT1)
3190 ext4_ext_mark_unwritten(ex);
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003191
3192 /*
3193 * path may lead to new leaf, not to original leaf any more
3194 * after ext4_ext_insert_extent() returns,
3195 */
3196 err = ext4_ext_dirty(handle, inode, path + depth);
3197 if (err)
3198 goto fix_extent_len;
3199
3200 ex2 = &newex;
3201 ex2->ee_block = cpu_to_le32(split);
3202 ex2->ee_len = cpu_to_le16(ee_len - (split - ee_block));
3203 ext4_ext_store_pblock(ex2, newblock);
Lukas Czerner556615d2014-04-20 23:45:47 -04003204 if (split_flag & EXT4_EXT_MARK_UNWRIT2)
3205 ext4_ext_mark_unwritten(ex2);
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003206
3207 err = ext4_ext_insert_extent(handle, inode, path, &newex, flags);
3208 if (err == -ENOSPC && (EXT4_EXT_MAY_ZEROOUT & split_flag)) {
Dmitry Monakhovdee1f972012-10-10 01:04:58 -04003209 if (split_flag & (EXT4_EXT_DATA_VALID1|EXT4_EXT_DATA_VALID2)) {
Zheng Liuadb23552013-03-10 21:13:05 -04003210 if (split_flag & EXT4_EXT_DATA_VALID1) {
Dmitry Monakhovdee1f972012-10-10 01:04:58 -04003211 err = ext4_ext_zeroout(inode, ex2);
Zheng Liuadb23552013-03-10 21:13:05 -04003212 zero_ex.ee_block = ex2->ee_block;
Zheng Liu8cde7ad2013-04-03 12:27:18 -04003213 zero_ex.ee_len = cpu_to_le16(
3214 ext4_ext_get_actual_len(ex2));
Zheng Liuadb23552013-03-10 21:13:05 -04003215 ext4_ext_store_pblock(&zero_ex,
3216 ext4_ext_pblock(ex2));
3217 } else {
Dmitry Monakhovdee1f972012-10-10 01:04:58 -04003218 err = ext4_ext_zeroout(inode, ex);
Zheng Liuadb23552013-03-10 21:13:05 -04003219 zero_ex.ee_block = ex->ee_block;
Zheng Liu8cde7ad2013-04-03 12:27:18 -04003220 zero_ex.ee_len = cpu_to_le16(
3221 ext4_ext_get_actual_len(ex));
Zheng Liuadb23552013-03-10 21:13:05 -04003222 ext4_ext_store_pblock(&zero_ex,
3223 ext4_ext_pblock(ex));
3224 }
3225 } else {
Dmitry Monakhovdee1f972012-10-10 01:04:58 -04003226 err = ext4_ext_zeroout(inode, &orig_ex);
Zheng Liuadb23552013-03-10 21:13:05 -04003227 zero_ex.ee_block = orig_ex.ee_block;
Zheng Liu8cde7ad2013-04-03 12:27:18 -04003228 zero_ex.ee_len = cpu_to_le16(
3229 ext4_ext_get_actual_len(&orig_ex));
Zheng Liuadb23552013-03-10 21:13:05 -04003230 ext4_ext_store_pblock(&zero_ex,
3231 ext4_ext_pblock(&orig_ex));
3232 }
Dmitry Monakhovdee1f972012-10-10 01:04:58 -04003233
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003234 if (err)
3235 goto fix_extent_len;
3236 /* update the extent length and mark as initialized */
Al Viroaf1584f2012-04-12 20:32:25 -04003237 ex->ee_len = cpu_to_le16(ee_len);
Theodore Ts'oecb94f52012-08-17 09:44:17 -04003238 ext4_ext_try_to_merge(handle, inode, path, ex);
3239 err = ext4_ext_dirty(handle, inode, path + path->p_depth);
Zheng Liuadb23552013-03-10 21:13:05 -04003240 if (err)
3241 goto fix_extent_len;
3242
3243 /* update extent status tree */
Zheng Liud7b2a002013-08-28 14:47:06 -04003244 err = ext4_zeroout_es(inode, &zero_ex);
Zheng Liuadb23552013-03-10 21:13:05 -04003245
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003246 goto out;
3247 } else if (err)
3248 goto fix_extent_len;
3249
3250out:
3251 ext4_ext_show_leaf(inode, path);
3252 return err;
3253
3254fix_extent_len:
3255 ex->ee_len = orig_ex.ee_len;
3256 ext4_ext_dirty(handle, inode, path + depth);
3257 return err;
3258}
3259
3260/*
3261 * ext4_split_extents() splits an extent and mark extent which is covered
3262 * by @map as split_flags indicates
3263 *
Anatol Pomozov70261f52013-08-28 14:40:12 -04003264 * It may result in splitting the extent into multiple extents (up to three)
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003265 * There are three possibilities:
3266 * a> There is no split required
3267 * b> Splits in two extents: Split is happening at either end of the extent
3268 * c> Splits in three extents: Somone is splitting in middle of the extent
3269 *
3270 */
3271static int ext4_split_extent(handle_t *handle,
3272 struct inode *inode,
3273 struct ext4_ext_path *path,
3274 struct ext4_map_blocks *map,
3275 int split_flag,
3276 int flags)
3277{
3278 ext4_lblk_t ee_block;
3279 struct ext4_extent *ex;
3280 unsigned int ee_len, depth;
3281 int err = 0;
Lukas Czerner556615d2014-04-20 23:45:47 -04003282 int unwritten;
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003283 int split_flag1, flags1;
Zheng Liu3a225672013-03-10 21:20:23 -04003284 int allocated = map->m_len;
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003285
3286 depth = ext_depth(inode);
3287 ex = path[depth].p_ext;
3288 ee_block = le32_to_cpu(ex->ee_block);
3289 ee_len = ext4_ext_get_actual_len(ex);
Lukas Czerner556615d2014-04-20 23:45:47 -04003290 unwritten = ext4_ext_is_unwritten(ex);
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003291
3292 if (map->m_lblk + map->m_len < ee_block + ee_len) {
Dmitry Monakhovdee1f972012-10-10 01:04:58 -04003293 split_flag1 = split_flag & EXT4_EXT_MAY_ZEROOUT;
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003294 flags1 = flags | EXT4_GET_BLOCKS_PRE_IO;
Lukas Czerner556615d2014-04-20 23:45:47 -04003295 if (unwritten)
3296 split_flag1 |= EXT4_EXT_MARK_UNWRIT1 |
3297 EXT4_EXT_MARK_UNWRIT2;
Dmitry Monakhovdee1f972012-10-10 01:04:58 -04003298 if (split_flag & EXT4_EXT_DATA_VALID2)
3299 split_flag1 |= EXT4_EXT_DATA_VALID1;
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003300 err = ext4_split_extent_at(handle, inode, path,
3301 map->m_lblk + map->m_len, split_flag1, flags1);
Yongqiang Yang93917412011-05-22 20:49:12 -04003302 if (err)
3303 goto out;
Zheng Liu3a225672013-03-10 21:20:23 -04003304 } else {
3305 allocated = ee_len - (map->m_lblk - ee_block);
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003306 }
Dmitry Monakhov357b66f2013-03-04 00:34:34 -05003307 /*
3308 * Update path is required because previous ext4_split_extent_at() may
3309 * result in split of original leaf or extent zeroout.
3310 */
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003311 ext4_ext_drop_refs(path);
Theodore Ts'o107a7bd2013-08-16 21:23:41 -04003312 path = ext4_ext_find_extent(inode, map->m_lblk, path, 0);
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003313 if (IS_ERR(path))
3314 return PTR_ERR(path);
Dmitry Monakhov357b66f2013-03-04 00:34:34 -05003315 depth = ext_depth(inode);
3316 ex = path[depth].p_ext;
Dmitry Monakhova18ed352014-04-13 15:41:13 -04003317 if (!ex) {
3318 EXT4_ERROR_INODE(inode, "unexpected hole at %lu",
3319 (unsigned long) map->m_lblk);
3320 return -EIO;
3321 }
Lukas Czerner556615d2014-04-20 23:45:47 -04003322 unwritten = ext4_ext_is_unwritten(ex);
Dmitry Monakhov357b66f2013-03-04 00:34:34 -05003323 split_flag1 = 0;
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003324
3325 if (map->m_lblk >= ee_block) {
Dmitry Monakhov357b66f2013-03-04 00:34:34 -05003326 split_flag1 = split_flag & EXT4_EXT_DATA_VALID2;
Lukas Czerner556615d2014-04-20 23:45:47 -04003327 if (unwritten) {
3328 split_flag1 |= EXT4_EXT_MARK_UNWRIT1;
Dmitry Monakhov357b66f2013-03-04 00:34:34 -05003329 split_flag1 |= split_flag & (EXT4_EXT_MAY_ZEROOUT |
Lukas Czerner556615d2014-04-20 23:45:47 -04003330 EXT4_EXT_MARK_UNWRIT2);
Dmitry Monakhov357b66f2013-03-04 00:34:34 -05003331 }
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003332 err = ext4_split_extent_at(handle, inode, path,
3333 map->m_lblk, split_flag1, flags);
3334 if (err)
3335 goto out;
3336 }
3337
3338 ext4_ext_show_leaf(inode, path);
3339out:
Zheng Liu3a225672013-03-10 21:20:23 -04003340 return err ? err : allocated;
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003341}
3342
Amit Arora56055d32007-07-17 21:42:38 -04003343/*
Theodore Ts'oe35fd662010-05-16 19:00:00 -04003344 * This function is called by ext4_ext_map_blocks() if someone tries to write
Lukas Czerner556615d2014-04-20 23:45:47 -04003345 * to an unwritten extent. It may result in splitting the unwritten
Lucas De Marchi25985ed2011-03-30 22:57:33 -03003346 * extent into multiple extents (up to three - one initialized and two
Lukas Czerner556615d2014-04-20 23:45:47 -04003347 * unwritten).
Amit Arora56055d32007-07-17 21:42:38 -04003348 * There are three possibilities:
3349 * a> There is no split required: Entire extent should be initialized
3350 * b> Splits in two extents: Write is happening at either end of the extent
3351 * c> Splits in three extents: Somone is writing in middle of the extent
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003352 *
3353 * Pre-conditions:
Lukas Czerner556615d2014-04-20 23:45:47 -04003354 * - The extent pointed to by 'path' is unwritten.
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003355 * - The extent pointed to by 'path' contains a superset
3356 * of the logical span [map->m_lblk, map->m_lblk + map->m_len).
3357 *
3358 * Post-conditions on success:
3359 * - the returned value is the number of blocks beyond map->l_lblk
3360 * that are allocated and initialized.
3361 * It is guaranteed to be >= map->m_len.
Amit Arora56055d32007-07-17 21:42:38 -04003362 */
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05003363static int ext4_ext_convert_to_initialized(handle_t *handle,
Theodore Ts'oe35fd662010-05-16 19:00:00 -04003364 struct inode *inode,
3365 struct ext4_map_blocks *map,
Lukas Czerner27dd4382013-04-09 22:11:22 -04003366 struct ext4_ext_path *path,
3367 int flags)
Amit Arora56055d32007-07-17 21:42:38 -04003368{
Zheng Liu67a5da52012-08-17 09:54:17 -04003369 struct ext4_sb_info *sbi;
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003370 struct ext4_extent_header *eh;
Yongqiang Yang667eff32011-05-03 12:25:07 -04003371 struct ext4_map_blocks split_map;
3372 struct ext4_extent zero_ex;
Lukas Czernerbc2d9db2013-04-03 23:33:27 -04003373 struct ext4_extent *ex, *abut_ex;
Dmitry Monakhov21ca0872010-05-16 06:00:00 -04003374 ext4_lblk_t ee_block, eof_block;
Lukas Czernerbc2d9db2013-04-03 23:33:27 -04003375 unsigned int ee_len, depth, map_len = map->m_len;
3376 int allocated = 0, max_zeroout = 0;
Amit Arora56055d32007-07-17 21:42:38 -04003377 int err = 0;
Yongqiang Yang667eff32011-05-03 12:25:07 -04003378 int split_flag = 0;
Dmitry Monakhov21ca0872010-05-16 06:00:00 -04003379
3380 ext_debug("ext4_ext_convert_to_initialized: inode %lu, logical"
3381 "block %llu, max_blocks %u\n", inode->i_ino,
Lukas Czernerbc2d9db2013-04-03 23:33:27 -04003382 (unsigned long long)map->m_lblk, map_len);
Dmitry Monakhov21ca0872010-05-16 06:00:00 -04003383
Zheng Liu67a5da52012-08-17 09:54:17 -04003384 sbi = EXT4_SB(inode->i_sb);
Dmitry Monakhov21ca0872010-05-16 06:00:00 -04003385 eof_block = (inode->i_size + inode->i_sb->s_blocksize - 1) >>
3386 inode->i_sb->s_blocksize_bits;
Lukas Czernerbc2d9db2013-04-03 23:33:27 -04003387 if (eof_block < map->m_lblk + map_len)
3388 eof_block = map->m_lblk + map_len;
Amit Arora56055d32007-07-17 21:42:38 -04003389
3390 depth = ext_depth(inode);
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003391 eh = path[depth].p_hdr;
Amit Arora56055d32007-07-17 21:42:38 -04003392 ex = path[depth].p_ext;
3393 ee_block = le32_to_cpu(ex->ee_block);
3394 ee_len = ext4_ext_get_actual_len(ex);
Zheng Liuadb23552013-03-10 21:13:05 -04003395 zero_ex.ee_len = 0;
Dmitry Monakhov21ca0872010-05-16 06:00:00 -04003396
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003397 trace_ext4_ext_convert_to_initialized_enter(inode, map, ex);
3398
3399 /* Pre-conditions */
Lukas Czerner556615d2014-04-20 23:45:47 -04003400 BUG_ON(!ext4_ext_is_unwritten(ex));
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003401 BUG_ON(!in_range(map->m_lblk, ee_block, ee_len));
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003402
3403 /*
3404 * Attempt to transfer newly initialized blocks from the currently
Lukas Czerner556615d2014-04-20 23:45:47 -04003405 * unwritten extent to its neighbor. This is much cheaper
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003406 * than an insertion followed by a merge as those involve costly
Lukas Czernerbc2d9db2013-04-03 23:33:27 -04003407 * memmove() calls. Transferring to the left is the common case in
3408 * steady state for workloads doing fallocate(FALLOC_FL_KEEP_SIZE)
3409 * followed by append writes.
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003410 *
3411 * Limitations of the current logic:
Lukas Czernerbc2d9db2013-04-03 23:33:27 -04003412 * - L1: we do not deal with writes covering the whole extent.
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003413 * This would require removing the extent if the transfer
3414 * is possible.
Lukas Czernerbc2d9db2013-04-03 23:33:27 -04003415 * - L2: we only attempt to merge with an extent stored in the
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003416 * same extent tree node.
3417 */
Lukas Czernerbc2d9db2013-04-03 23:33:27 -04003418 if ((map->m_lblk == ee_block) &&
3419 /* See if we can merge left */
3420 (map_len < ee_len) && /*L1*/
3421 (ex > EXT_FIRST_EXTENT(eh))) { /*L2*/
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003422 ext4_lblk_t prev_lblk;
3423 ext4_fsblk_t prev_pblk, ee_pblk;
Lukas Czernerbc2d9db2013-04-03 23:33:27 -04003424 unsigned int prev_len;
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003425
Lukas Czernerbc2d9db2013-04-03 23:33:27 -04003426 abut_ex = ex - 1;
3427 prev_lblk = le32_to_cpu(abut_ex->ee_block);
3428 prev_len = ext4_ext_get_actual_len(abut_ex);
3429 prev_pblk = ext4_ext_pblock(abut_ex);
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003430 ee_pblk = ext4_ext_pblock(ex);
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003431
3432 /*
Lukas Czernerbc2d9db2013-04-03 23:33:27 -04003433 * A transfer of blocks from 'ex' to 'abut_ex' is allowed
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003434 * upon those conditions:
Lukas Czernerbc2d9db2013-04-03 23:33:27 -04003435 * - C1: abut_ex is initialized,
3436 * - C2: abut_ex is logically abutting ex,
3437 * - C3: abut_ex is physically abutting ex,
3438 * - C4: abut_ex can receive the additional blocks without
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003439 * overflowing the (initialized) length limit.
3440 */
Lukas Czerner556615d2014-04-20 23:45:47 -04003441 if ((!ext4_ext_is_unwritten(abut_ex)) && /*C1*/
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003442 ((prev_lblk + prev_len) == ee_block) && /*C2*/
3443 ((prev_pblk + prev_len) == ee_pblk) && /*C3*/
Lukas Czernerbc2d9db2013-04-03 23:33:27 -04003444 (prev_len < (EXT_INIT_MAX_LEN - map_len))) { /*C4*/
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003445 err = ext4_ext_get_access(handle, inode, path + depth);
3446 if (err)
3447 goto out;
3448
3449 trace_ext4_ext_convert_to_initialized_fastpath(inode,
Lukas Czernerbc2d9db2013-04-03 23:33:27 -04003450 map, ex, abut_ex);
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003451
Lukas Czernerbc2d9db2013-04-03 23:33:27 -04003452 /* Shift the start of ex by 'map_len' blocks */
3453 ex->ee_block = cpu_to_le32(ee_block + map_len);
3454 ext4_ext_store_pblock(ex, ee_pblk + map_len);
3455 ex->ee_len = cpu_to_le16(ee_len - map_len);
Lukas Czerner556615d2014-04-20 23:45:47 -04003456 ext4_ext_mark_unwritten(ex); /* Restore the flag */
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003457
Lukas Czernerbc2d9db2013-04-03 23:33:27 -04003458 /* Extend abut_ex by 'map_len' blocks */
3459 abut_ex->ee_len = cpu_to_le16(prev_len + map_len);
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003460
3461 /* Result: number of initialized blocks past m_lblk */
Lukas Czernerbc2d9db2013-04-03 23:33:27 -04003462 allocated = map_len;
3463 }
3464 } else if (((map->m_lblk + map_len) == (ee_block + ee_len)) &&
3465 (map_len < ee_len) && /*L1*/
3466 ex < EXT_LAST_EXTENT(eh)) { /*L2*/
3467 /* See if we can merge right */
3468 ext4_lblk_t next_lblk;
3469 ext4_fsblk_t next_pblk, ee_pblk;
3470 unsigned int next_len;
3471
3472 abut_ex = ex + 1;
3473 next_lblk = le32_to_cpu(abut_ex->ee_block);
3474 next_len = ext4_ext_get_actual_len(abut_ex);
3475 next_pblk = ext4_ext_pblock(abut_ex);
3476 ee_pblk = ext4_ext_pblock(ex);
3477
3478 /*
3479 * A transfer of blocks from 'ex' to 'abut_ex' is allowed
3480 * upon those conditions:
3481 * - C1: abut_ex is initialized,
3482 * - C2: abut_ex is logically abutting ex,
3483 * - C3: abut_ex is physically abutting ex,
3484 * - C4: abut_ex can receive the additional blocks without
3485 * overflowing the (initialized) length limit.
3486 */
Lukas Czerner556615d2014-04-20 23:45:47 -04003487 if ((!ext4_ext_is_unwritten(abut_ex)) && /*C1*/
Lukas Czernerbc2d9db2013-04-03 23:33:27 -04003488 ((map->m_lblk + map_len) == next_lblk) && /*C2*/
3489 ((ee_pblk + ee_len) == next_pblk) && /*C3*/
3490 (next_len < (EXT_INIT_MAX_LEN - map_len))) { /*C4*/
3491 err = ext4_ext_get_access(handle, inode, path + depth);
3492 if (err)
3493 goto out;
3494
3495 trace_ext4_ext_convert_to_initialized_fastpath(inode,
3496 map, ex, abut_ex);
3497
3498 /* Shift the start of abut_ex by 'map_len' blocks */
3499 abut_ex->ee_block = cpu_to_le32(next_lblk - map_len);
3500 ext4_ext_store_pblock(abut_ex, next_pblk - map_len);
3501 ex->ee_len = cpu_to_le16(ee_len - map_len);
Lukas Czerner556615d2014-04-20 23:45:47 -04003502 ext4_ext_mark_unwritten(ex); /* Restore the flag */
Lukas Czernerbc2d9db2013-04-03 23:33:27 -04003503
3504 /* Extend abut_ex by 'map_len' blocks */
3505 abut_ex->ee_len = cpu_to_le16(next_len + map_len);
3506
3507 /* Result: number of initialized blocks past m_lblk */
3508 allocated = map_len;
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003509 }
3510 }
Lukas Czernerbc2d9db2013-04-03 23:33:27 -04003511 if (allocated) {
3512 /* Mark the block containing both extents as dirty */
3513 ext4_ext_dirty(handle, inode, path + depth);
3514
3515 /* Update path to point to the right extent */
3516 path[depth].p_ext = abut_ex;
3517 goto out;
3518 } else
3519 allocated = ee_len - (map->m_lblk - ee_block);
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003520
Yongqiang Yang667eff32011-05-03 12:25:07 -04003521 WARN_ON(map->m_lblk < ee_block);
Dmitry Monakhov21ca0872010-05-16 06:00:00 -04003522 /*
3523 * It is safe to convert extent to initialized via explicit
Yongqiang Yang9e740562014-01-06 14:05:23 -05003524 * zeroout only if extent is fully inside i_size or new_size.
Dmitry Monakhov21ca0872010-05-16 06:00:00 -04003525 */
Yongqiang Yang667eff32011-05-03 12:25:07 -04003526 split_flag |= ee_block + ee_len <= eof_block ? EXT4_EXT_MAY_ZEROOUT : 0;
Dmitry Monakhov21ca0872010-05-16 06:00:00 -04003527
Zheng Liu67a5da52012-08-17 09:54:17 -04003528 if (EXT4_EXT_MAY_ZEROOUT & split_flag)
3529 max_zeroout = sbi->s_extent_max_zeroout_kb >>
Lukas Czerner4f42f802013-03-12 12:40:04 -04003530 (inode->i_sb->s_blocksize_bits - 10);
Zheng Liu67a5da52012-08-17 09:54:17 -04003531
3532 /* If extent is less than s_max_zeroout_kb, zeroout directly */
3533 if (max_zeroout && (ee_len <= max_zeroout)) {
Yongqiang Yang667eff32011-05-03 12:25:07 -04003534 err = ext4_ext_zeroout(inode, ex);
Aneesh Kumar K.V3977c962008-04-17 10:38:59 -04003535 if (err)
Aneesh Kumar K.Vd03856b2008-08-02 18:51:32 -04003536 goto out;
Zheng Liuadb23552013-03-10 21:13:05 -04003537 zero_ex.ee_block = ex->ee_block;
Zheng Liu8cde7ad2013-04-03 12:27:18 -04003538 zero_ex.ee_len = cpu_to_le16(ext4_ext_get_actual_len(ex));
Zheng Liuadb23552013-03-10 21:13:05 -04003539 ext4_ext_store_pblock(&zero_ex, ext4_ext_pblock(ex));
Aneesh Kumar K.Vd03856b2008-08-02 18:51:32 -04003540
3541 err = ext4_ext_get_access(handle, inode, path + depth);
3542 if (err)
3543 goto out;
Yongqiang Yang667eff32011-05-03 12:25:07 -04003544 ext4_ext_mark_initialized(ex);
Theodore Ts'oecb94f52012-08-17 09:44:17 -04003545 ext4_ext_try_to_merge(handle, inode, path, ex);
3546 err = ext4_ext_dirty(handle, inode, path + path->p_depth);
Yongqiang Yang667eff32011-05-03 12:25:07 -04003547 goto out;
Amit Arora56055d32007-07-17 21:42:38 -04003548 }
Yongqiang Yang667eff32011-05-03 12:25:07 -04003549
Amit Arora56055d32007-07-17 21:42:38 -04003550 /*
Yongqiang Yang667eff32011-05-03 12:25:07 -04003551 * four cases:
3552 * 1. split the extent into three extents.
3553 * 2. split the extent into two extents, zeroout the first half.
3554 * 3. split the extent into two extents, zeroout the second half.
3555 * 4. split the extent into two extents with out zeroout.
Amit Arora56055d32007-07-17 21:42:38 -04003556 */
Yongqiang Yang667eff32011-05-03 12:25:07 -04003557 split_map.m_lblk = map->m_lblk;
3558 split_map.m_len = map->m_len;
3559
Zheng Liu67a5da52012-08-17 09:54:17 -04003560 if (max_zeroout && (allocated > map->m_len)) {
3561 if (allocated <= max_zeroout) {
Yongqiang Yang667eff32011-05-03 12:25:07 -04003562 /* case 3 */
3563 zero_ex.ee_block =
Allison Henderson9b940f82011-05-16 10:11:09 -04003564 cpu_to_le32(map->m_lblk);
3565 zero_ex.ee_len = cpu_to_le16(allocated);
Yongqiang Yang667eff32011-05-03 12:25:07 -04003566 ext4_ext_store_pblock(&zero_ex,
3567 ext4_ext_pblock(ex) + map->m_lblk - ee_block);
3568 err = ext4_ext_zeroout(inode, &zero_ex);
Amit Arora56055d32007-07-17 21:42:38 -04003569 if (err)
3570 goto out;
Yongqiang Yang667eff32011-05-03 12:25:07 -04003571 split_map.m_lblk = map->m_lblk;
3572 split_map.m_len = allocated;
Zheng Liu67a5da52012-08-17 09:54:17 -04003573 } else if (map->m_lblk - ee_block + map->m_len < max_zeroout) {
Yongqiang Yang667eff32011-05-03 12:25:07 -04003574 /* case 2 */
3575 if (map->m_lblk != ee_block) {
3576 zero_ex.ee_block = ex->ee_block;
3577 zero_ex.ee_len = cpu_to_le16(map->m_lblk -
3578 ee_block);
3579 ext4_ext_store_pblock(&zero_ex,
3580 ext4_ext_pblock(ex));
3581 err = ext4_ext_zeroout(inode, &zero_ex);
3582 if (err)
3583 goto out;
3584 }
3585
Yongqiang Yang667eff32011-05-03 12:25:07 -04003586 split_map.m_lblk = ee_block;
Allison Henderson9b940f82011-05-16 10:11:09 -04003587 split_map.m_len = map->m_lblk - ee_block + map->m_len;
3588 allocated = map->m_len;
Amit Arora56055d32007-07-17 21:42:38 -04003589 }
3590 }
Yongqiang Yang667eff32011-05-03 12:25:07 -04003591
3592 allocated = ext4_split_extent(handle, inode, path,
Lukas Czerner27dd4382013-04-09 22:11:22 -04003593 &split_map, split_flag, flags);
Yongqiang Yang667eff32011-05-03 12:25:07 -04003594 if (allocated < 0)
3595 err = allocated;
3596
Amit Arora56055d32007-07-17 21:42:38 -04003597out:
Zheng Liuadb23552013-03-10 21:13:05 -04003598 /* If we have gotten a failure, don't zero out status tree */
3599 if (!err)
Zheng Liud7b2a002013-08-28 14:47:06 -04003600 err = ext4_zeroout_es(inode, &zero_ex);
Amit Arora56055d32007-07-17 21:42:38 -04003601 return err ? err : allocated;
3602}
3603
Aneesh Kumar K.Vc278bfe2008-01-28 23:58:27 -05003604/*
Theodore Ts'oe35fd662010-05-16 19:00:00 -04003605 * This function is called by ext4_ext_map_blocks() from
Mingming Cao00314622009-09-28 15:49:08 -04003606 * ext4_get_blocks_dio_write() when DIO to write
Lukas Czerner556615d2014-04-20 23:45:47 -04003607 * to an unwritten extent.
Mingming Cao00314622009-09-28 15:49:08 -04003608 *
Lukas Czerner556615d2014-04-20 23:45:47 -04003609 * Writing to an unwritten extent may result in splitting the unwritten
3610 * extent into multiple initialized/unwritten extents (up to three)
Mingming Cao00314622009-09-28 15:49:08 -04003611 * There are three possibilities:
Lukas Czerner556615d2014-04-20 23:45:47 -04003612 * a> There is no split required: Entire extent should be unwritten
Mingming Cao00314622009-09-28 15:49:08 -04003613 * b> Splits in two extents: Write is happening at either end of the extent
3614 * c> Splits in three extents: Somone is writing in middle of the extent
3615 *
Lukas Czernerb8a86842014-03-18 18:05:35 -04003616 * This works the same way in the case of initialized -> unwritten conversion.
3617 *
Mingming Cao00314622009-09-28 15:49:08 -04003618 * One of more index blocks maybe needed if the extent tree grow after
Lukas Czerner556615d2014-04-20 23:45:47 -04003619 * the unwritten extent split. To prevent ENOSPC occur at the IO
3620 * complete, we need to split the unwritten extent before DIO submit
3621 * the IO. The unwritten extent called at this time will be split
3622 * into three unwritten extent(at most). After IO complete, the part
Mingming Cao00314622009-09-28 15:49:08 -04003623 * being filled will be convert to initialized by the end_io callback function
3624 * via ext4_convert_unwritten_extents().
Mingmingba230c32009-11-06 04:01:23 -05003625 *
Lukas Czerner556615d2014-04-20 23:45:47 -04003626 * Returns the size of unwritten extent to be written on success.
Mingming Cao00314622009-09-28 15:49:08 -04003627 */
Lukas Czernerb8a86842014-03-18 18:05:35 -04003628static int ext4_split_convert_extents(handle_t *handle,
Mingming Cao00314622009-09-28 15:49:08 -04003629 struct inode *inode,
Theodore Ts'oe35fd662010-05-16 19:00:00 -04003630 struct ext4_map_blocks *map,
Mingming Cao00314622009-09-28 15:49:08 -04003631 struct ext4_ext_path *path,
Mingming Cao00314622009-09-28 15:49:08 -04003632 int flags)
3633{
Yongqiang Yang667eff32011-05-03 12:25:07 -04003634 ext4_lblk_t eof_block;
3635 ext4_lblk_t ee_block;
3636 struct ext4_extent *ex;
3637 unsigned int ee_len;
3638 int split_flag = 0, depth;
Mingming Cao00314622009-09-28 15:49:08 -04003639
Lukas Czernerb8a86842014-03-18 18:05:35 -04003640 ext_debug("%s: inode %lu, logical block %llu, max_blocks %u\n",
3641 __func__, inode->i_ino,
3642 (unsigned long long)map->m_lblk, map->m_len);
Dmitry Monakhov21ca0872010-05-16 06:00:00 -04003643
3644 eof_block = (inode->i_size + inode->i_sb->s_blocksize - 1) >>
3645 inode->i_sb->s_blocksize_bits;
Theodore Ts'oe35fd662010-05-16 19:00:00 -04003646 if (eof_block < map->m_lblk + map->m_len)
3647 eof_block = map->m_lblk + map->m_len;
Mingming Cao00314622009-09-28 15:49:08 -04003648 /*
Dmitry Monakhov21ca0872010-05-16 06:00:00 -04003649 * It is safe to convert extent to initialized via explicit
3650 * zeroout only if extent is fully insde i_size or new_size.
3651 */
Yongqiang Yang667eff32011-05-03 12:25:07 -04003652 depth = ext_depth(inode);
3653 ex = path[depth].p_ext;
3654 ee_block = le32_to_cpu(ex->ee_block);
3655 ee_len = ext4_ext_get_actual_len(ex);
Dmitry Monakhov21ca0872010-05-16 06:00:00 -04003656
Lukas Czernerb8a86842014-03-18 18:05:35 -04003657 /* Convert to unwritten */
3658 if (flags & EXT4_GET_BLOCKS_CONVERT_UNWRITTEN) {
3659 split_flag |= EXT4_EXT_DATA_VALID1;
3660 /* Convert to initialized */
3661 } else if (flags & EXT4_GET_BLOCKS_CONVERT) {
3662 split_flag |= ee_block + ee_len <= eof_block ?
3663 EXT4_EXT_MAY_ZEROOUT : 0;
Lukas Czerner556615d2014-04-20 23:45:47 -04003664 split_flag |= (EXT4_EXT_MARK_UNWRIT2 | EXT4_EXT_DATA_VALID2);
Lukas Czernerb8a86842014-03-18 18:05:35 -04003665 }
Yongqiang Yang667eff32011-05-03 12:25:07 -04003666 flags |= EXT4_GET_BLOCKS_PRE_IO;
3667 return ext4_split_extent(handle, inode, path, map, split_flag, flags);
Mingming Cao00314622009-09-28 15:49:08 -04003668}
Yongqiang Yang197217a2011-05-03 11:45:29 -04003669
Lukas Czernerb8a86842014-03-18 18:05:35 -04003670static int ext4_convert_initialized_extents(handle_t *handle,
3671 struct inode *inode,
3672 struct ext4_map_blocks *map,
3673 struct ext4_ext_path *path)
3674{
3675 struct ext4_extent *ex;
3676 ext4_lblk_t ee_block;
3677 unsigned int ee_len;
3678 int depth;
3679 int err = 0;
3680
3681 depth = ext_depth(inode);
3682 ex = path[depth].p_ext;
3683 ee_block = le32_to_cpu(ex->ee_block);
3684 ee_len = ext4_ext_get_actual_len(ex);
3685
3686 ext_debug("%s: inode %lu, logical"
3687 "block %llu, max_blocks %u\n", __func__, inode->i_ino,
3688 (unsigned long long)ee_block, ee_len);
3689
3690 if (ee_block != map->m_lblk || ee_len > map->m_len) {
3691 err = ext4_split_convert_extents(handle, inode, map, path,
3692 EXT4_GET_BLOCKS_CONVERT_UNWRITTEN);
3693 if (err < 0)
3694 goto out;
3695 ext4_ext_drop_refs(path);
3696 path = ext4_ext_find_extent(inode, map->m_lblk, path, 0);
3697 if (IS_ERR(path)) {
3698 err = PTR_ERR(path);
3699 goto out;
3700 }
3701 depth = ext_depth(inode);
3702 ex = path[depth].p_ext;
Dmitry Monakhova18ed352014-04-13 15:41:13 -04003703 if (!ex) {
3704 EXT4_ERROR_INODE(inode, "unexpected hole at %lu",
3705 (unsigned long) map->m_lblk);
3706 err = -EIO;
3707 goto out;
3708 }
Lukas Czernerb8a86842014-03-18 18:05:35 -04003709 }
3710
3711 err = ext4_ext_get_access(handle, inode, path + depth);
3712 if (err)
3713 goto out;
Lukas Czerner556615d2014-04-20 23:45:47 -04003714 /* first mark the extent as unwritten */
3715 ext4_ext_mark_unwritten(ex);
Lukas Czernerb8a86842014-03-18 18:05:35 -04003716
3717 /* note: ext4_ext_correct_indexes() isn't needed here because
3718 * borders are not changed
3719 */
3720 ext4_ext_try_to_merge(handle, inode, path, ex);
3721
3722 /* Mark modified extent as dirty */
3723 err = ext4_ext_dirty(handle, inode, path + path->p_depth);
3724out:
3725 ext4_ext_show_leaf(inode, path);
3726 return err;
3727}
3728
3729
Jiaying Zhangc7064ef2010-03-02 13:28:44 -05003730static int ext4_convert_unwritten_extents_endio(handle_t *handle,
Dmitry Monakhovdee1f972012-10-10 01:04:58 -04003731 struct inode *inode,
3732 struct ext4_map_blocks *map,
3733 struct ext4_ext_path *path)
Mingming Cao00314622009-09-28 15:49:08 -04003734{
3735 struct ext4_extent *ex;
Dmitry Monakhovdee1f972012-10-10 01:04:58 -04003736 ext4_lblk_t ee_block;
3737 unsigned int ee_len;
Mingming Cao00314622009-09-28 15:49:08 -04003738 int depth;
3739 int err = 0;
Mingming Cao00314622009-09-28 15:49:08 -04003740
3741 depth = ext_depth(inode);
Mingming Cao00314622009-09-28 15:49:08 -04003742 ex = path[depth].p_ext;
Dmitry Monakhovdee1f972012-10-10 01:04:58 -04003743 ee_block = le32_to_cpu(ex->ee_block);
3744 ee_len = ext4_ext_get_actual_len(ex);
Mingming Cao00314622009-09-28 15:49:08 -04003745
Yongqiang Yang197217a2011-05-03 11:45:29 -04003746 ext_debug("ext4_convert_unwritten_extents_endio: inode %lu, logical"
3747 "block %llu, max_blocks %u\n", inode->i_ino,
Dmitry Monakhovdee1f972012-10-10 01:04:58 -04003748 (unsigned long long)ee_block, ee_len);
3749
Dmitry Monakhovff95ec22013-03-04 00:41:05 -05003750 /* If extent is larger than requested it is a clear sign that we still
3751 * have some extent state machine issues left. So extent_split is still
3752 * required.
3753 * TODO: Once all related issues will be fixed this situation should be
3754 * illegal.
3755 */
Dmitry Monakhovdee1f972012-10-10 01:04:58 -04003756 if (ee_block != map->m_lblk || ee_len > map->m_len) {
Dmitry Monakhovff95ec22013-03-04 00:41:05 -05003757#ifdef EXT4_DEBUG
3758 ext4_warning("Inode (%ld) finished: extent logical block %llu,"
3759 " len %u; IO logical block %llu, len %u\n",
3760 inode->i_ino, (unsigned long long)ee_block, ee_len,
3761 (unsigned long long)map->m_lblk, map->m_len);
3762#endif
Lukas Czernerb8a86842014-03-18 18:05:35 -04003763 err = ext4_split_convert_extents(handle, inode, map, path,
3764 EXT4_GET_BLOCKS_CONVERT);
Dmitry Monakhovdee1f972012-10-10 01:04:58 -04003765 if (err < 0)
3766 goto out;
3767 ext4_ext_drop_refs(path);
Theodore Ts'o107a7bd2013-08-16 21:23:41 -04003768 path = ext4_ext_find_extent(inode, map->m_lblk, path, 0);
Dmitry Monakhovdee1f972012-10-10 01:04:58 -04003769 if (IS_ERR(path)) {
3770 err = PTR_ERR(path);
3771 goto out;
3772 }
3773 depth = ext_depth(inode);
3774 ex = path[depth].p_ext;
3775 }
Yongqiang Yang197217a2011-05-03 11:45:29 -04003776
Mingming Cao00314622009-09-28 15:49:08 -04003777 err = ext4_ext_get_access(handle, inode, path + depth);
3778 if (err)
3779 goto out;
3780 /* first mark the extent as initialized */
3781 ext4_ext_mark_initialized(ex);
3782
Yongqiang Yang197217a2011-05-03 11:45:29 -04003783 /* note: ext4_ext_correct_indexes() isn't needed here because
3784 * borders are not changed
Mingming Cao00314622009-09-28 15:49:08 -04003785 */
Theodore Ts'oecb94f52012-08-17 09:44:17 -04003786 ext4_ext_try_to_merge(handle, inode, path, ex);
Yongqiang Yang197217a2011-05-03 11:45:29 -04003787
Mingming Cao00314622009-09-28 15:49:08 -04003788 /* Mark modified extent as dirty */
Theodore Ts'oecb94f52012-08-17 09:44:17 -04003789 err = ext4_ext_dirty(handle, inode, path + path->p_depth);
Mingming Cao00314622009-09-28 15:49:08 -04003790out:
3791 ext4_ext_show_leaf(inode, path);
3792 return err;
3793}
3794
Aneesh Kumar K.V515f41c2009-12-29 23:39:06 -05003795static void unmap_underlying_metadata_blocks(struct block_device *bdev,
3796 sector_t block, int count)
3797{
3798 int i;
3799 for (i = 0; i < count; i++)
3800 unmap_underlying_metadata(bdev, block + i);
3801}
3802
Theodore Ts'o58590b02010-10-27 21:23:12 -04003803/*
3804 * Handle EOFBLOCKS_FL flag, clearing it if necessary
3805 */
3806static int check_eofblocks_fl(handle_t *handle, struct inode *inode,
Eric Sandeend002ebf2011-01-10 13:03:35 -05003807 ext4_lblk_t lblk,
Theodore Ts'o58590b02010-10-27 21:23:12 -04003808 struct ext4_ext_path *path,
3809 unsigned int len)
3810{
3811 int i, depth;
3812 struct ext4_extent_header *eh;
Sergey Senozhatsky65922cb2011-03-23 14:08:27 -04003813 struct ext4_extent *last_ex;
Theodore Ts'o58590b02010-10-27 21:23:12 -04003814
3815 if (!ext4_test_inode_flag(inode, EXT4_INODE_EOFBLOCKS))
3816 return 0;
3817
3818 depth = ext_depth(inode);
3819 eh = path[depth].p_hdr;
Theodore Ts'o58590b02010-10-27 21:23:12 -04003820
Lukas Czernerafcff5d2012-03-21 21:47:55 -04003821 /*
3822 * We're going to remove EOFBLOCKS_FL entirely in future so we
3823 * do not care for this case anymore. Simply remove the flag
3824 * if there are no extents.
3825 */
3826 if (unlikely(!eh->eh_entries))
3827 goto out;
Theodore Ts'o58590b02010-10-27 21:23:12 -04003828 last_ex = EXT_LAST_EXTENT(eh);
3829 /*
3830 * We should clear the EOFBLOCKS_FL flag if we are writing the
3831 * last block in the last extent in the file. We test this by
3832 * first checking to see if the caller to
3833 * ext4_ext_get_blocks() was interested in the last block (or
3834 * a block beyond the last block) in the current extent. If
3835 * this turns out to be false, we can bail out from this
3836 * function immediately.
3837 */
Eric Sandeend002ebf2011-01-10 13:03:35 -05003838 if (lblk + len < le32_to_cpu(last_ex->ee_block) +
Theodore Ts'o58590b02010-10-27 21:23:12 -04003839 ext4_ext_get_actual_len(last_ex))
3840 return 0;
3841 /*
3842 * If the caller does appear to be planning to write at or
3843 * beyond the end of the current extent, we then test to see
3844 * if the current extent is the last extent in the file, by
3845 * checking to make sure it was reached via the rightmost node
3846 * at each level of the tree.
3847 */
3848 for (i = depth-1; i >= 0; i--)
3849 if (path[i].p_idx != EXT_LAST_INDEX(path[i].p_hdr))
3850 return 0;
Lukas Czernerafcff5d2012-03-21 21:47:55 -04003851out:
Theodore Ts'o58590b02010-10-27 21:23:12 -04003852 ext4_clear_inode_flag(inode, EXT4_INODE_EOFBLOCKS);
3853 return ext4_mark_inode_dirty(handle, inode);
3854}
3855
Aditya Kali7b415bf2011-09-09 19:04:51 -04003856/**
3857 * ext4_find_delalloc_range: find delayed allocated block in the given range.
3858 *
Zheng Liu7d1b1fb2012-11-08 21:57:35 -05003859 * Return 1 if there is a delalloc block in the range, otherwise 0.
Aditya Kali7b415bf2011-09-09 19:04:51 -04003860 */
Zheng Liuf7fec032013-02-18 00:28:47 -05003861int ext4_find_delalloc_range(struct inode *inode,
3862 ext4_lblk_t lblk_start,
3863 ext4_lblk_t lblk_end)
Aditya Kali7b415bf2011-09-09 19:04:51 -04003864{
Zheng Liu7d1b1fb2012-11-08 21:57:35 -05003865 struct extent_status es;
Aditya Kali7b415bf2011-09-09 19:04:51 -04003866
Yan, Zhenge30b5dc2013-05-03 02:15:52 -04003867 ext4_es_find_delayed_extent_range(inode, lblk_start, lblk_end, &es);
Zheng Liu06b0c882013-02-18 00:26:51 -05003868 if (es.es_len == 0)
Zheng Liu7d1b1fb2012-11-08 21:57:35 -05003869 return 0; /* there is no delay extent in this tree */
Zheng Liu06b0c882013-02-18 00:26:51 -05003870 else if (es.es_lblk <= lblk_start &&
3871 lblk_start < es.es_lblk + es.es_len)
Zheng Liu7d1b1fb2012-11-08 21:57:35 -05003872 return 1;
Zheng Liu06b0c882013-02-18 00:26:51 -05003873 else if (lblk_start <= es.es_lblk && es.es_lblk <= lblk_end)
Zheng Liu7d1b1fb2012-11-08 21:57:35 -05003874 return 1;
Aditya Kali7b415bf2011-09-09 19:04:51 -04003875 else
Zheng Liu7d1b1fb2012-11-08 21:57:35 -05003876 return 0;
Aditya Kali7b415bf2011-09-09 19:04:51 -04003877}
3878
Zheng Liu7d1b1fb2012-11-08 21:57:35 -05003879int ext4_find_delalloc_cluster(struct inode *inode, ext4_lblk_t lblk)
Aditya Kali7b415bf2011-09-09 19:04:51 -04003880{
3881 struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
3882 ext4_lblk_t lblk_start, lblk_end;
Theodore Ts'of5a44db2013-12-20 09:29:35 -05003883 lblk_start = EXT4_LBLK_CMASK(sbi, lblk);
Aditya Kali7b415bf2011-09-09 19:04:51 -04003884 lblk_end = lblk_start + sbi->s_cluster_ratio - 1;
3885
Zheng Liu7d1b1fb2012-11-08 21:57:35 -05003886 return ext4_find_delalloc_range(inode, lblk_start, lblk_end);
Aditya Kali7b415bf2011-09-09 19:04:51 -04003887}
3888
3889/**
3890 * Determines how many complete clusters (out of those specified by the 'map')
3891 * are under delalloc and were reserved quota for.
3892 * This function is called when we are writing out the blocks that were
3893 * originally written with their allocation delayed, but then the space was
3894 * allocated using fallocate() before the delayed allocation could be resolved.
3895 * The cases to look for are:
3896 * ('=' indicated delayed allocated blocks
3897 * '-' indicates non-delayed allocated blocks)
3898 * (a) partial clusters towards beginning and/or end outside of allocated range
3899 * are not delalloc'ed.
3900 * Ex:
3901 * |----c---=|====c====|====c====|===-c----|
3902 * |++++++ allocated ++++++|
3903 * ==> 4 complete clusters in above example
3904 *
3905 * (b) partial cluster (outside of allocated range) towards either end is
3906 * marked for delayed allocation. In this case, we will exclude that
3907 * cluster.
3908 * Ex:
3909 * |----====c========|========c========|
3910 * |++++++ allocated ++++++|
3911 * ==> 1 complete clusters in above example
3912 *
3913 * Ex:
3914 * |================c================|
3915 * |++++++ allocated ++++++|
3916 * ==> 0 complete clusters in above example
3917 *
3918 * The ext4_da_update_reserve_space will be called only if we
3919 * determine here that there were some "entire" clusters that span
3920 * this 'allocated' range.
3921 * In the non-bigalloc case, this function will just end up returning num_blks
3922 * without ever calling ext4_find_delalloc_range.
3923 */
3924static unsigned int
3925get_reserved_cluster_alloc(struct inode *inode, ext4_lblk_t lblk_start,
3926 unsigned int num_blks)
3927{
3928 struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
3929 ext4_lblk_t alloc_cluster_start, alloc_cluster_end;
3930 ext4_lblk_t lblk_from, lblk_to, c_offset;
3931 unsigned int allocated_clusters = 0;
3932
3933 alloc_cluster_start = EXT4_B2C(sbi, lblk_start);
3934 alloc_cluster_end = EXT4_B2C(sbi, lblk_start + num_blks - 1);
3935
3936 /* max possible clusters for this allocation */
3937 allocated_clusters = alloc_cluster_end - alloc_cluster_start + 1;
3938
Aditya Kalid8990242011-09-09 19:18:51 -04003939 trace_ext4_get_reserved_cluster_alloc(inode, lblk_start, num_blks);
3940
Aditya Kali7b415bf2011-09-09 19:04:51 -04003941 /* Check towards left side */
Theodore Ts'of5a44db2013-12-20 09:29:35 -05003942 c_offset = EXT4_LBLK_COFF(sbi, lblk_start);
Aditya Kali7b415bf2011-09-09 19:04:51 -04003943 if (c_offset) {
Theodore Ts'of5a44db2013-12-20 09:29:35 -05003944 lblk_from = EXT4_LBLK_CMASK(sbi, lblk_start);
Aditya Kali7b415bf2011-09-09 19:04:51 -04003945 lblk_to = lblk_from + c_offset - 1;
3946
Zheng Liu7d1b1fb2012-11-08 21:57:35 -05003947 if (ext4_find_delalloc_range(inode, lblk_from, lblk_to))
Aditya Kali7b415bf2011-09-09 19:04:51 -04003948 allocated_clusters--;
3949 }
3950
3951 /* Now check towards right. */
Theodore Ts'of5a44db2013-12-20 09:29:35 -05003952 c_offset = EXT4_LBLK_COFF(sbi, lblk_start + num_blks);
Aditya Kali7b415bf2011-09-09 19:04:51 -04003953 if (allocated_clusters && c_offset) {
3954 lblk_from = lblk_start + num_blks;
3955 lblk_to = lblk_from + (sbi->s_cluster_ratio - c_offset) - 1;
3956
Zheng Liu7d1b1fb2012-11-08 21:57:35 -05003957 if (ext4_find_delalloc_range(inode, lblk_from, lblk_to))
Aditya Kali7b415bf2011-09-09 19:04:51 -04003958 allocated_clusters--;
3959 }
3960
3961 return allocated_clusters;
3962}
3963
Mingming Cao00314622009-09-28 15:49:08 -04003964static int
Lukas Czernerb8a86842014-03-18 18:05:35 -04003965ext4_ext_convert_initialized_extent(handle_t *handle, struct inode *inode,
3966 struct ext4_map_blocks *map,
3967 struct ext4_ext_path *path, int flags,
3968 unsigned int allocated, ext4_fsblk_t newblock)
3969{
3970 int ret = 0;
3971 int err = 0;
3972
3973 /*
3974 * Make sure that the extent is no bigger than we support with
Lukas Czerner556615d2014-04-20 23:45:47 -04003975 * unwritten extent
Lukas Czernerb8a86842014-03-18 18:05:35 -04003976 */
Lukas Czerner556615d2014-04-20 23:45:47 -04003977 if (map->m_len > EXT_UNWRITTEN_MAX_LEN)
3978 map->m_len = EXT_UNWRITTEN_MAX_LEN / 2;
Lukas Czernerb8a86842014-03-18 18:05:35 -04003979
3980 ret = ext4_convert_initialized_extents(handle, inode, map,
3981 path);
3982 if (ret >= 0) {
3983 ext4_update_inode_fsync_trans(handle, inode, 1);
3984 err = check_eofblocks_fl(handle, inode, map->m_lblk,
3985 path, map->m_len);
3986 } else
3987 err = ret;
3988 map->m_flags |= EXT4_MAP_UNWRITTEN;
3989 if (allocated > map->m_len)
3990 allocated = map->m_len;
3991 map->m_len = allocated;
3992
3993 return err ? err : allocated;
3994}
3995
3996static int
Lukas Czerner556615d2014-04-20 23:45:47 -04003997ext4_ext_handle_unwritten_extents(handle_t *handle, struct inode *inode,
Theodore Ts'oe35fd662010-05-16 19:00:00 -04003998 struct ext4_map_blocks *map,
Mingming Cao00314622009-09-28 15:49:08 -04003999 struct ext4_ext_path *path, int flags,
Theodore Ts'oe35fd662010-05-16 19:00:00 -04004000 unsigned int allocated, ext4_fsblk_t newblock)
Mingming Cao00314622009-09-28 15:49:08 -04004001{
4002 int ret = 0;
4003 int err = 0;
Dmitry Monakhovf45ee3a2012-09-28 23:21:09 -04004004 ext4_io_end_t *io = ext4_inode_aio(inode);
Mingming Cao00314622009-09-28 15:49:08 -04004005
Lukas Czerner556615d2014-04-20 23:45:47 -04004006 ext_debug("ext4_ext_handle_unwritten_extents: inode %lu, logical "
Zheng Liu88635ca2011-12-28 19:00:25 -05004007 "block %llu, max_blocks %u, flags %x, allocated %u\n",
Theodore Ts'oe35fd662010-05-16 19:00:00 -04004008 inode->i_ino, (unsigned long long)map->m_lblk, map->m_len,
Mingming Cao00314622009-09-28 15:49:08 -04004009 flags, allocated);
4010 ext4_ext_show_leaf(inode, path);
4011
Lukas Czerner27dd4382013-04-09 22:11:22 -04004012 /*
Lukas Czerner556615d2014-04-20 23:45:47 -04004013 * When writing into unwritten space, we should not fail to
Lukas Czerner27dd4382013-04-09 22:11:22 -04004014 * allocate metadata blocks for the new extent block if needed.
4015 */
4016 flags |= EXT4_GET_BLOCKS_METADATA_NOFAIL;
4017
Lukas Czerner556615d2014-04-20 23:45:47 -04004018 trace_ext4_ext_handle_unwritten_extents(inode, map, flags,
Zheng Liub5645532012-11-08 14:33:43 -05004019 allocated, newblock);
Aditya Kalid8990242011-09-09 19:18:51 -04004020
Jiaying Zhangc7064ef2010-03-02 13:28:44 -05004021 /* get_block() before submit the IO, split the extent */
Lukas Czernerc8b459f2014-05-12 12:55:07 -04004022 if (flags & EXT4_GET_BLOCKS_PRE_IO) {
Lukas Czernerb8a86842014-03-18 18:05:35 -04004023 ret = ext4_split_convert_extents(handle, inode, map,
4024 path, flags | EXT4_GET_BLOCKS_CONVERT);
Dmitry Monakhov82e54222012-09-28 23:36:25 -04004025 if (ret <= 0)
4026 goto out;
Mingming5f524952009-11-10 10:48:04 -05004027 /*
4028 * Flag the inode(non aio case) or end_io struct (aio case)
Lucas De Marchi25985ed2011-03-30 22:57:33 -03004029 * that this IO needs to conversion to written when IO is
Mingming5f524952009-11-10 10:48:04 -05004030 * completed
4031 */
Tao Ma0edeb712011-10-31 17:30:44 -04004032 if (io)
4033 ext4_set_io_unwritten_flag(inode, io);
4034 else
Theodore Ts'o19f5fb72010-01-24 14:34:07 -05004035 ext4_set_inode_state(inode, EXT4_STATE_DIO_UNWRITTEN);
Zheng Liua25a4e12013-02-18 00:28:04 -05004036 map->m_flags |= EXT4_MAP_UNWRITTEN;
Mingming Cao00314622009-09-28 15:49:08 -04004037 goto out;
4038 }
Jiaying Zhangc7064ef2010-03-02 13:28:44 -05004039 /* IO end_io complete, convert the filled extent to written */
Lukas Czernerc8b459f2014-05-12 12:55:07 -04004040 if (flags & EXT4_GET_BLOCKS_CONVERT) {
Dmitry Monakhovdee1f972012-10-10 01:04:58 -04004041 ret = ext4_convert_unwritten_extents_endio(handle, inode, map,
Mingming Cao00314622009-09-28 15:49:08 -04004042 path);
Theodore Ts'o58590b02010-10-27 21:23:12 -04004043 if (ret >= 0) {
Jan Karab436b9b2009-12-08 23:51:10 -05004044 ext4_update_inode_fsync_trans(handle, inode, 1);
Eric Sandeend002ebf2011-01-10 13:03:35 -05004045 err = check_eofblocks_fl(handle, inode, map->m_lblk,
4046 path, map->m_len);
Theodore Ts'o58590b02010-10-27 21:23:12 -04004047 } else
4048 err = ret;
Zheng Liucdee7842013-03-10 21:08:52 -04004049 map->m_flags |= EXT4_MAP_MAPPED;
Eric Whitney15cc1762014-02-12 10:42:45 -05004050 map->m_pblk = newblock;
Zheng Liucdee7842013-03-10 21:08:52 -04004051 if (allocated > map->m_len)
4052 allocated = map->m_len;
4053 map->m_len = allocated;
Mingming Cao00314622009-09-28 15:49:08 -04004054 goto out2;
4055 }
4056 /* buffered IO case */
4057 /*
4058 * repeat fallocate creation request
4059 * we already have an unwritten extent
4060 */
Lukas Czerner556615d2014-04-20 23:45:47 -04004061 if (flags & EXT4_GET_BLOCKS_UNWRIT_EXT) {
Zheng Liua25a4e12013-02-18 00:28:04 -05004062 map->m_flags |= EXT4_MAP_UNWRITTEN;
Mingming Cao00314622009-09-28 15:49:08 -04004063 goto map_out;
Zheng Liua25a4e12013-02-18 00:28:04 -05004064 }
Mingming Cao00314622009-09-28 15:49:08 -04004065
4066 /* buffered READ or buffered write_begin() lookup */
4067 if ((flags & EXT4_GET_BLOCKS_CREATE) == 0) {
4068 /*
4069 * We have blocks reserved already. We
4070 * return allocated blocks so that delalloc
4071 * won't do block reservation for us. But
4072 * the buffer head will be unmapped so that
4073 * a read from the block returns 0s.
4074 */
Theodore Ts'oe35fd662010-05-16 19:00:00 -04004075 map->m_flags |= EXT4_MAP_UNWRITTEN;
Mingming Cao00314622009-09-28 15:49:08 -04004076 goto out1;
4077 }
4078
4079 /* buffered write, writepage time, convert*/
Lukas Czerner27dd4382013-04-09 22:11:22 -04004080 ret = ext4_ext_convert_to_initialized(handle, inode, map, path, flags);
Dmitry Monakhova4e5d882011-10-25 08:15:12 -04004081 if (ret >= 0)
Jan Karab436b9b2009-12-08 23:51:10 -05004082 ext4_update_inode_fsync_trans(handle, inode, 1);
Mingming Cao00314622009-09-28 15:49:08 -04004083out:
4084 if (ret <= 0) {
4085 err = ret;
4086 goto out2;
4087 } else
4088 allocated = ret;
Theodore Ts'oe35fd662010-05-16 19:00:00 -04004089 map->m_flags |= EXT4_MAP_NEW;
Aneesh Kumar K.V515f41c2009-12-29 23:39:06 -05004090 /*
4091 * if we allocated more blocks than requested
4092 * we need to make sure we unmap the extra block
4093 * allocated. The actual needed block will get
4094 * unmapped later when we find the buffer_head marked
4095 * new.
4096 */
Theodore Ts'oe35fd662010-05-16 19:00:00 -04004097 if (allocated > map->m_len) {
Aneesh Kumar K.V515f41c2009-12-29 23:39:06 -05004098 unmap_underlying_metadata_blocks(inode->i_sb->s_bdev,
Theodore Ts'oe35fd662010-05-16 19:00:00 -04004099 newblock + map->m_len,
4100 allocated - map->m_len);
4101 allocated = map->m_len;
Aneesh Kumar K.V515f41c2009-12-29 23:39:06 -05004102 }
Zheng Liu3a225672013-03-10 21:20:23 -04004103 map->m_len = allocated;
Aneesh Kumar K.V5f634d02010-01-25 04:00:31 -05004104
4105 /*
4106 * If we have done fallocate with the offset that is already
4107 * delayed allocated, we would have block reservation
4108 * and quota reservation done in the delayed write path.
4109 * But fallocate would have already updated quota and block
4110 * count for this offset. So cancel these reservation
4111 */
Aditya Kali7b415bf2011-09-09 19:04:51 -04004112 if (flags & EXT4_GET_BLOCKS_DELALLOC_RESERVE) {
4113 unsigned int reserved_clusters;
4114 reserved_clusters = get_reserved_cluster_alloc(inode,
4115 map->m_lblk, map->m_len);
4116 if (reserved_clusters)
4117 ext4_da_update_reserve_space(inode,
4118 reserved_clusters,
4119 0);
4120 }
Aneesh Kumar K.V5f634d02010-01-25 04:00:31 -05004121
Mingming Cao00314622009-09-28 15:49:08 -04004122map_out:
Theodore Ts'oe35fd662010-05-16 19:00:00 -04004123 map->m_flags |= EXT4_MAP_MAPPED;
Dmitry Monakhova4e5d882011-10-25 08:15:12 -04004124 if ((flags & EXT4_GET_BLOCKS_KEEP_SIZE) == 0) {
4125 err = check_eofblocks_fl(handle, inode, map->m_lblk, path,
4126 map->m_len);
4127 if (err < 0)
4128 goto out2;
4129 }
Mingming Cao00314622009-09-28 15:49:08 -04004130out1:
Theodore Ts'oe35fd662010-05-16 19:00:00 -04004131 if (allocated > map->m_len)
4132 allocated = map->m_len;
Mingming Cao00314622009-09-28 15:49:08 -04004133 ext4_ext_show_leaf(inode, path);
Theodore Ts'oe35fd662010-05-16 19:00:00 -04004134 map->m_pblk = newblock;
4135 map->m_len = allocated;
Mingming Cao00314622009-09-28 15:49:08 -04004136out2:
Mingming Cao00314622009-09-28 15:49:08 -04004137 return err ? err : allocated;
4138}
Theodore Ts'o58590b02010-10-27 21:23:12 -04004139
Mingming Cao00314622009-09-28 15:49:08 -04004140/*
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004141 * get_implied_cluster_alloc - check to see if the requested
4142 * allocation (in the map structure) overlaps with a cluster already
4143 * allocated in an extent.
Aditya Kalid8990242011-09-09 19:18:51 -04004144 * @sb The filesystem superblock structure
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004145 * @map The requested lblk->pblk mapping
4146 * @ex The extent structure which might contain an implied
4147 * cluster allocation
4148 *
4149 * This function is called by ext4_ext_map_blocks() after we failed to
4150 * find blocks that were already in the inode's extent tree. Hence,
4151 * we know that the beginning of the requested region cannot overlap
4152 * the extent from the inode's extent tree. There are three cases we
4153 * want to catch. The first is this case:
4154 *
4155 * |--- cluster # N--|
4156 * |--- extent ---| |---- requested region ---|
4157 * |==========|
4158 *
4159 * The second case that we need to test for is this one:
4160 *
4161 * |--------- cluster # N ----------------|
4162 * |--- requested region --| |------- extent ----|
4163 * |=======================|
4164 *
4165 * The third case is when the requested region lies between two extents
4166 * within the same cluster:
4167 * |------------- cluster # N-------------|
4168 * |----- ex -----| |---- ex_right ----|
4169 * |------ requested region ------|
4170 * |================|
4171 *
4172 * In each of the above cases, we need to set the map->m_pblk and
4173 * map->m_len so it corresponds to the return the extent labelled as
4174 * "|====|" from cluster #N, since it is already in use for data in
4175 * cluster EXT4_B2C(sbi, map->m_lblk). We will then return 1 to
4176 * signal to ext4_ext_map_blocks() that map->m_pblk should be treated
4177 * as a new "allocated" block region. Otherwise, we will return 0 and
4178 * ext4_ext_map_blocks() will then allocate one or more new clusters
4179 * by calling ext4_mb_new_blocks().
4180 */
Aditya Kalid8990242011-09-09 19:18:51 -04004181static int get_implied_cluster_alloc(struct super_block *sb,
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004182 struct ext4_map_blocks *map,
4183 struct ext4_extent *ex,
4184 struct ext4_ext_path *path)
4185{
Aditya Kalid8990242011-09-09 19:18:51 -04004186 struct ext4_sb_info *sbi = EXT4_SB(sb);
Theodore Ts'of5a44db2013-12-20 09:29:35 -05004187 ext4_lblk_t c_offset = EXT4_LBLK_COFF(sbi, map->m_lblk);
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004188 ext4_lblk_t ex_cluster_start, ex_cluster_end;
Curt Wohlgemuth14d7f3e2011-12-18 17:39:02 -05004189 ext4_lblk_t rr_cluster_start;
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004190 ext4_lblk_t ee_block = le32_to_cpu(ex->ee_block);
4191 ext4_fsblk_t ee_start = ext4_ext_pblock(ex);
4192 unsigned short ee_len = ext4_ext_get_actual_len(ex);
4193
4194 /* The extent passed in that we are trying to match */
4195 ex_cluster_start = EXT4_B2C(sbi, ee_block);
4196 ex_cluster_end = EXT4_B2C(sbi, ee_block + ee_len - 1);
4197
4198 /* The requested region passed into ext4_map_blocks() */
4199 rr_cluster_start = EXT4_B2C(sbi, map->m_lblk);
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004200
4201 if ((rr_cluster_start == ex_cluster_end) ||
4202 (rr_cluster_start == ex_cluster_start)) {
4203 if (rr_cluster_start == ex_cluster_end)
4204 ee_start += ee_len - 1;
Theodore Ts'of5a44db2013-12-20 09:29:35 -05004205 map->m_pblk = EXT4_PBLK_CMASK(sbi, ee_start) + c_offset;
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004206 map->m_len = min(map->m_len,
4207 (unsigned) sbi->s_cluster_ratio - c_offset);
4208 /*
4209 * Check for and handle this case:
4210 *
4211 * |--------- cluster # N-------------|
4212 * |------- extent ----|
4213 * |--- requested region ---|
4214 * |===========|
4215 */
4216
4217 if (map->m_lblk < ee_block)
4218 map->m_len = min(map->m_len, ee_block - map->m_lblk);
4219
4220 /*
4221 * Check for the case where there is already another allocated
4222 * block to the right of 'ex' but before the end of the cluster.
4223 *
4224 * |------------- cluster # N-------------|
4225 * |----- ex -----| |---- ex_right ----|
4226 * |------ requested region ------|
4227 * |================|
4228 */
4229 if (map->m_lblk > ee_block) {
4230 ext4_lblk_t next = ext4_ext_next_allocated_block(path);
4231 map->m_len = min(map->m_len, next - map->m_lblk);
4232 }
Aditya Kalid8990242011-09-09 19:18:51 -04004233
4234 trace_ext4_get_implied_cluster_alloc_exit(sb, map, 1);
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004235 return 1;
4236 }
Aditya Kalid8990242011-09-09 19:18:51 -04004237
4238 trace_ext4_get_implied_cluster_alloc_exit(sb, map, 0);
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004239 return 0;
4240}
4241
4242
4243/*
Mingming Caof5ab0d12008-02-25 15:29:55 -05004244 * Block allocation/map/preallocation routine for extents based files
4245 *
4246 *
Aneesh Kumar K.Vc278bfe2008-01-28 23:58:27 -05004247 * Need to be called with
Aneesh Kumar K.V0e855ac2008-01-28 23:58:26 -05004248 * down_read(&EXT4_I(inode)->i_data_sem) if not allocating file system block
4249 * (ie, create is zero). Otherwise down_write(&EXT4_I(inode)->i_data_sem)
Mingming Caof5ab0d12008-02-25 15:29:55 -05004250 *
4251 * return > 0, number of of blocks already mapped/allocated
4252 * if create == 0 and these are pre-allocated blocks
4253 * buffer head is unmapped
4254 * otherwise blocks are mapped
4255 *
4256 * return = 0, if plain look up failed (blocks have not been allocated)
4257 * buffer head is unmapped
4258 *
4259 * return < 0, error case.
Aneesh Kumar K.Vc278bfe2008-01-28 23:58:27 -05004260 */
Theodore Ts'oe35fd662010-05-16 19:00:00 -04004261int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
4262 struct ext4_map_blocks *map, int flags)
Alex Tomasa86c6182006-10-11 01:21:03 -07004263{
4264 struct ext4_ext_path *path = NULL;
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004265 struct ext4_extent newex, *ex, *ex2;
4266 struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
Jiaying Zhang0562e0b2011-03-21 21:38:05 -04004267 ext4_fsblk_t newblock = 0;
Eric Whitneyce37c422014-02-19 18:52:39 -05004268 int free_on_err = 0, err = 0, depth, ret;
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004269 unsigned int allocated = 0, offset = 0;
Yongqiang Yang81fdbb42011-10-29 09:23:38 -04004270 unsigned int allocated_clusters = 0;
Alex Tomasc9de5602008-01-29 00:19:52 -05004271 struct ext4_allocation_request ar;
Dmitry Monakhovf45ee3a2012-09-28 23:21:09 -04004272 ext4_io_end_t *io = ext4_inode_aio(inode);
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004273 ext4_lblk_t cluster_offset;
Dmitry Monakhov82e54222012-09-28 23:36:25 -04004274 int set_unwritten = 0;
Alex Tomasa86c6182006-10-11 01:21:03 -07004275
Mingming84fe3be2009-09-01 08:44:37 -04004276 ext_debug("blocks %u/%u requested for inode %lu\n",
Theodore Ts'oe35fd662010-05-16 19:00:00 -04004277 map->m_lblk, map->m_len, inode->i_ino);
Jiaying Zhang0562e0b2011-03-21 21:38:05 -04004278 trace_ext4_ext_map_blocks_enter(inode, map->m_lblk, map->m_len, flags);
Alex Tomasa86c6182006-10-11 01:21:03 -07004279
Alex Tomasa86c6182006-10-11 01:21:03 -07004280 /* find extent for this block */
Theodore Ts'o107a7bd2013-08-16 21:23:41 -04004281 path = ext4_ext_find_extent(inode, map->m_lblk, NULL, 0);
Alex Tomasa86c6182006-10-11 01:21:03 -07004282 if (IS_ERR(path)) {
4283 err = PTR_ERR(path);
4284 path = NULL;
4285 goto out2;
4286 }
4287
4288 depth = ext_depth(inode);
4289
4290 /*
Randy Dunlapd0d856e2006-10-11 01:21:07 -07004291 * consistent leaf must not be empty;
4292 * this situation is possible, though, _during_ tree modification;
Alex Tomasa86c6182006-10-11 01:21:03 -07004293 * this is why assert can't be put in ext4_ext_find_extent()
4294 */
Frank Mayhar273df552010-03-02 11:46:09 -05004295 if (unlikely(path[depth].p_ext == NULL && depth != 0)) {
4296 EXT4_ERROR_INODE(inode, "bad extent address "
Theodore Ts'of70f3622010-05-16 23:00:00 -04004297 "lblock: %lu, depth: %d pblock %lld",
4298 (unsigned long) map->m_lblk, depth,
4299 path[depth].p_block);
Surbhi Palande034fb4c2009-12-14 09:53:52 -05004300 err = -EIO;
4301 goto out2;
4302 }
Alex Tomasa86c6182006-10-11 01:21:03 -07004303
Avantika Mathur7e028972006-12-06 20:41:33 -08004304 ex = path[depth].p_ext;
4305 if (ex) {
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05004306 ext4_lblk_t ee_block = le32_to_cpu(ex->ee_block);
Theodore Ts'obf89d162010-10-27 21:30:14 -04004307 ext4_fsblk_t ee_start = ext4_ext_pblock(ex);
Amit Aroraa2df2a62007-07-17 21:42:41 -04004308 unsigned short ee_len;
Suparna Bhattacharya471d4012006-10-11 01:21:06 -07004309
Lukas Czernerb8a86842014-03-18 18:05:35 -04004310
Suparna Bhattacharya471d4012006-10-11 01:21:06 -07004311 /*
Lukas Czerner556615d2014-04-20 23:45:47 -04004312 * unwritten extents are treated as holes, except that
Amit Arora56055d32007-07-17 21:42:38 -04004313 * we split out initialized portions during a write.
Suparna Bhattacharya471d4012006-10-11 01:21:06 -07004314 */
Amit Aroraa2df2a62007-07-17 21:42:41 -04004315 ee_len = ext4_ext_get_actual_len(ex);
Aditya Kalid8990242011-09-09 19:18:51 -04004316
4317 trace_ext4_ext_show_extent(inode, ee_block, ee_start, ee_len);
4318
Randy Dunlapd0d856e2006-10-11 01:21:07 -07004319 /* if found extent covers block, simply return it */
Theodore Ts'oe35fd662010-05-16 19:00:00 -04004320 if (in_range(map->m_lblk, ee_block, ee_len)) {
4321 newblock = map->m_lblk - ee_block + ee_start;
Randy Dunlapd0d856e2006-10-11 01:21:07 -07004322 /* number of remaining blocks in the extent */
Theodore Ts'oe35fd662010-05-16 19:00:00 -04004323 allocated = ee_len - (map->m_lblk - ee_block);
4324 ext_debug("%u fit into %u:%d -> %llu\n", map->m_lblk,
4325 ee_block, ee_len, newblock);
Amit Arora56055d32007-07-17 21:42:38 -04004326
Lukas Czernerb8a86842014-03-18 18:05:35 -04004327 /*
4328 * If the extent is initialized check whether the
4329 * caller wants to convert it to unwritten.
4330 */
Lukas Czerner556615d2014-04-20 23:45:47 -04004331 if ((!ext4_ext_is_unwritten(ex)) &&
Lukas Czernerb8a86842014-03-18 18:05:35 -04004332 (flags & EXT4_GET_BLOCKS_CONVERT_UNWRITTEN)) {
4333 allocated = ext4_ext_convert_initialized_extent(
4334 handle, inode, map, path, flags,
4335 allocated, newblock);
4336 goto out2;
Lukas Czerner556615d2014-04-20 23:45:47 -04004337 } else if (!ext4_ext_is_unwritten(ex))
Lukas Czerner78771912012-03-19 23:05:43 -04004338 goto out;
Zheng Liu69eb33d2013-02-18 00:31:07 -05004339
Lukas Czerner556615d2014-04-20 23:45:47 -04004340 ret = ext4_ext_handle_unwritten_extents(
Lukas Czerner78771912012-03-19 23:05:43 -04004341 handle, inode, map, path, flags,
4342 allocated, newblock);
Eric Whitneyce37c422014-02-19 18:52:39 -05004343 if (ret < 0)
4344 err = ret;
4345 else
4346 allocated = ret;
Eric Whitney31cf0f22014-03-13 23:14:46 -04004347 goto out2;
Alex Tomasa86c6182006-10-11 01:21:03 -07004348 }
4349 }
4350
Aditya Kali7b415bf2011-09-09 19:04:51 -04004351 if ((sbi->s_cluster_ratio > 1) &&
Zheng Liu7d1b1fb2012-11-08 21:57:35 -05004352 ext4_find_delalloc_cluster(inode, map->m_lblk))
Aditya Kali7b415bf2011-09-09 19:04:51 -04004353 map->m_flags |= EXT4_MAP_FROM_CLUSTER;
4354
Alex Tomasa86c6182006-10-11 01:21:03 -07004355 /*
Randy Dunlapd0d856e2006-10-11 01:21:07 -07004356 * requested block isn't allocated yet;
Alex Tomasa86c6182006-10-11 01:21:03 -07004357 * we couldn't try to create block if create flag is zero
4358 */
Theodore Ts'oc2177052009-05-14 00:58:52 -04004359 if ((flags & EXT4_GET_BLOCKS_CREATE) == 0) {
Amit Arora56055d32007-07-17 21:42:38 -04004360 /*
4361 * put just found gap into cache to speed up
4362 * subsequent requests
4363 */
Zheng Liud100eef2013-02-18 00:29:59 -05004364 if ((flags & EXT4_GET_BLOCKS_NO_PUT_HOLE) == 0)
4365 ext4_ext_put_gap_in_cache(inode, path, map->m_lblk);
Alex Tomasa86c6182006-10-11 01:21:03 -07004366 goto out2;
4367 }
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004368
Alex Tomasa86c6182006-10-11 01:21:03 -07004369 /*
Theodore Ts'oc2ea3fd2008-10-10 09:40:52 -04004370 * Okay, we need to do block allocation.
Andrew Morton63f57932006-10-11 01:21:24 -07004371 */
Aditya Kali7b415bf2011-09-09 19:04:51 -04004372 map->m_flags &= ~EXT4_MAP_FROM_CLUSTER;
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004373 newex.ee_block = cpu_to_le32(map->m_lblk);
Eric Whitneyd0abafa2014-01-06 14:00:23 -05004374 cluster_offset = EXT4_LBLK_COFF(sbi, map->m_lblk);
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004375
4376 /*
4377 * If we are doing bigalloc, check to see if the extent returned
4378 * by ext4_ext_find_extent() implies a cluster we can use.
4379 */
4380 if (cluster_offset && ex &&
Aditya Kalid8990242011-09-09 19:18:51 -04004381 get_implied_cluster_alloc(inode->i_sb, map, ex, path)) {
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004382 ar.len = allocated = map->m_len;
4383 newblock = map->m_pblk;
Aditya Kali7b415bf2011-09-09 19:04:51 -04004384 map->m_flags |= EXT4_MAP_FROM_CLUSTER;
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004385 goto got_allocated_blocks;
4386 }
Alex Tomasa86c6182006-10-11 01:21:03 -07004387
Alex Tomasc9de5602008-01-29 00:19:52 -05004388 /* find neighbour allocated blocks */
Theodore Ts'oe35fd662010-05-16 19:00:00 -04004389 ar.lleft = map->m_lblk;
Alex Tomasc9de5602008-01-29 00:19:52 -05004390 err = ext4_ext_search_left(inode, path, &ar.lleft, &ar.pleft);
4391 if (err)
4392 goto out2;
Theodore Ts'oe35fd662010-05-16 19:00:00 -04004393 ar.lright = map->m_lblk;
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004394 ex2 = NULL;
4395 err = ext4_ext_search_right(inode, path, &ar.lright, &ar.pright, &ex2);
Alex Tomasc9de5602008-01-29 00:19:52 -05004396 if (err)
4397 goto out2;
Amit Arora25d14f92007-05-24 13:04:13 -04004398
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004399 /* Check if the extent after searching to the right implies a
4400 * cluster we can use. */
4401 if ((sbi->s_cluster_ratio > 1) && ex2 &&
Aditya Kalid8990242011-09-09 19:18:51 -04004402 get_implied_cluster_alloc(inode->i_sb, map, ex2, path)) {
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004403 ar.len = allocated = map->m_len;
4404 newblock = map->m_pblk;
Aditya Kali7b415bf2011-09-09 19:04:51 -04004405 map->m_flags |= EXT4_MAP_FROM_CLUSTER;
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004406 goto got_allocated_blocks;
4407 }
4408
Amit Arora749269f2007-07-18 09:02:56 -04004409 /*
4410 * See if request is beyond maximum number of blocks we can have in
4411 * a single extent. For an initialized extent this limit is
Lukas Czerner556615d2014-04-20 23:45:47 -04004412 * EXT_INIT_MAX_LEN and for an unwritten extent this limit is
4413 * EXT_UNWRITTEN_MAX_LEN.
Amit Arora749269f2007-07-18 09:02:56 -04004414 */
Theodore Ts'oe35fd662010-05-16 19:00:00 -04004415 if (map->m_len > EXT_INIT_MAX_LEN &&
Lukas Czerner556615d2014-04-20 23:45:47 -04004416 !(flags & EXT4_GET_BLOCKS_UNWRIT_EXT))
Theodore Ts'oe35fd662010-05-16 19:00:00 -04004417 map->m_len = EXT_INIT_MAX_LEN;
Lukas Czerner556615d2014-04-20 23:45:47 -04004418 else if (map->m_len > EXT_UNWRITTEN_MAX_LEN &&
4419 (flags & EXT4_GET_BLOCKS_UNWRIT_EXT))
4420 map->m_len = EXT_UNWRITTEN_MAX_LEN;
Amit Arora749269f2007-07-18 09:02:56 -04004421
Theodore Ts'oe35fd662010-05-16 19:00:00 -04004422 /* Check if we can really insert (m_lblk)::(m_lblk + m_len) extent */
Theodore Ts'oe35fd662010-05-16 19:00:00 -04004423 newex.ee_len = cpu_to_le16(map->m_len);
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004424 err = ext4_ext_check_overlap(sbi, inode, &newex, path);
Amit Arora25d14f92007-05-24 13:04:13 -04004425 if (err)
Aneesh Kumar K.Vb939e372008-01-28 23:58:27 -05004426 allocated = ext4_ext_get_actual_len(&newex);
Amit Arora25d14f92007-05-24 13:04:13 -04004427 else
Theodore Ts'oe35fd662010-05-16 19:00:00 -04004428 allocated = map->m_len;
Alex Tomasc9de5602008-01-29 00:19:52 -05004429
4430 /* allocate new block */
4431 ar.inode = inode;
Theodore Ts'oe35fd662010-05-16 19:00:00 -04004432 ar.goal = ext4_ext_find_goal(inode, path, map->m_lblk);
4433 ar.logical = map->m_lblk;
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004434 /*
4435 * We calculate the offset from the beginning of the cluster
4436 * for the logical block number, since when we allocate a
4437 * physical cluster, the physical block should start at the
4438 * same offset from the beginning of the cluster. This is
4439 * needed so that future calls to get_implied_cluster_alloc()
4440 * work correctly.
4441 */
Theodore Ts'of5a44db2013-12-20 09:29:35 -05004442 offset = EXT4_LBLK_COFF(sbi, map->m_lblk);
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004443 ar.len = EXT4_NUM_B2C(sbi, offset+allocated);
4444 ar.goal -= offset;
4445 ar.logical -= offset;
Alex Tomasc9de5602008-01-29 00:19:52 -05004446 if (S_ISREG(inode->i_mode))
4447 ar.flags = EXT4_MB_HINT_DATA;
4448 else
4449 /* disable in-core preallocation for non-regular files */
4450 ar.flags = 0;
Vivek Haldar556b27a2011-05-25 07:41:54 -04004451 if (flags & EXT4_GET_BLOCKS_NO_NORMALIZE)
4452 ar.flags |= EXT4_MB_HINT_NOPREALLOC;
Alex Tomasc9de5602008-01-29 00:19:52 -05004453 newblock = ext4_mb_new_blocks(handle, &ar, &err);
Alex Tomasa86c6182006-10-11 01:21:03 -07004454 if (!newblock)
4455 goto out2;
Mingming84fe3be2009-09-01 08:44:37 -04004456 ext_debug("allocate new block: goal %llu, found %llu/%u\n",
Theodore Ts'o498e5f22008-11-05 00:14:04 -05004457 ar.goal, newblock, allocated);
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004458 free_on_err = 1;
Aditya Kali7b415bf2011-09-09 19:04:51 -04004459 allocated_clusters = ar.len;
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004460 ar.len = EXT4_C2B(sbi, ar.len) - offset;
4461 if (ar.len > allocated)
4462 ar.len = allocated;
Alex Tomasa86c6182006-10-11 01:21:03 -07004463
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004464got_allocated_blocks:
Alex Tomasa86c6182006-10-11 01:21:03 -07004465 /* try to insert new extent into found leaf and return */
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004466 ext4_ext_store_pblock(&newex, newblock + offset);
Alex Tomasc9de5602008-01-29 00:19:52 -05004467 newex.ee_len = cpu_to_le16(ar.len);
Lukas Czerner556615d2014-04-20 23:45:47 -04004468 /* Mark unwritten */
4469 if (flags & EXT4_GET_BLOCKS_UNWRIT_EXT){
4470 ext4_ext_mark_unwritten(&newex);
Zheng Liua25a4e12013-02-18 00:28:04 -05004471 map->m_flags |= EXT4_MAP_UNWRITTEN;
Mingming Cao8d5d02e2009-09-28 15:48:29 -04004472 /*
Jiaying Zhang744692d2010-03-04 16:14:02 -05004473 * io_end structure was created for every IO write to an
Lukas Czerner556615d2014-04-20 23:45:47 -04004474 * unwritten extent. To avoid unnecessary conversion,
Jiaying Zhang744692d2010-03-04 16:14:02 -05004475 * here we flag the IO that really needs the conversion.
Mingming5f524952009-11-10 10:48:04 -05004476 * For non asycn direct IO case, flag the inode state
Lucas De Marchi25985ed2011-03-30 22:57:33 -03004477 * that we need to perform conversion when IO is done.
Mingming Cao8d5d02e2009-09-28 15:48:29 -04004478 */
Lukas Czernerc8b459f2014-05-12 12:55:07 -04004479 if (flags & EXT4_GET_BLOCKS_PRE_IO)
Dmitry Monakhov82e54222012-09-28 23:36:25 -04004480 set_unwritten = 1;
Mingming Cao8d5d02e2009-09-28 15:48:29 -04004481 }
Jiaying Zhangc8d46e42010-02-24 09:52:53 -05004482
Dmitry Monakhova4e5d882011-10-25 08:15:12 -04004483 err = 0;
4484 if ((flags & EXT4_GET_BLOCKS_KEEP_SIZE) == 0)
4485 err = check_eofblocks_fl(handle, inode, map->m_lblk,
4486 path, ar.len);
Jiaying Zhang575a1d42011-07-10 20:07:25 -04004487 if (!err)
4488 err = ext4_ext_insert_extent(handle, inode, path,
4489 &newex, flags);
Dmitry Monakhov82e54222012-09-28 23:36:25 -04004490
4491 if (!err && set_unwritten) {
4492 if (io)
4493 ext4_set_io_unwritten_flag(inode, io);
4494 else
4495 ext4_set_inode_state(inode,
4496 EXT4_STATE_DIO_UNWRITTEN);
4497 }
4498
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004499 if (err && free_on_err) {
Maxim Patlasov7132de72011-07-10 19:37:48 -04004500 int fb_flags = flags & EXT4_GET_BLOCKS_DELALLOC_RESERVE ?
4501 EXT4_FREE_BLOCKS_NO_QUOT_UPDATE : 0;
Alex Tomas315054f2007-05-24 13:04:25 -04004502 /* free data blocks we just allocated */
Alex Tomasc9de5602008-01-29 00:19:52 -05004503 /* not a good idea to call discard here directly,
4504 * but otherwise we'd need to call it every free() */
Theodore Ts'oc2ea3fd2008-10-10 09:40:52 -04004505 ext4_discard_preallocations(inode);
Theodore Ts'oc8e15132013-07-15 00:09:37 -04004506 ext4_free_blocks(handle, inode, NULL, newblock,
4507 EXT4_C2B(sbi, allocated_clusters), fb_flags);
Alex Tomasa86c6182006-10-11 01:21:03 -07004508 goto out2;
Alex Tomas315054f2007-05-24 13:04:25 -04004509 }
Alex Tomasa86c6182006-10-11 01:21:03 -07004510
Alex Tomasa86c6182006-10-11 01:21:03 -07004511 /* previous routine could use block we allocated */
Theodore Ts'obf89d162010-10-27 21:30:14 -04004512 newblock = ext4_ext_pblock(&newex);
Aneesh Kumar K.Vb939e372008-01-28 23:58:27 -05004513 allocated = ext4_ext_get_actual_len(&newex);
Theodore Ts'oe35fd662010-05-16 19:00:00 -04004514 if (allocated > map->m_len)
4515 allocated = map->m_len;
4516 map->m_flags |= EXT4_MAP_NEW;
Alex Tomasa86c6182006-10-11 01:21:03 -07004517
Jan Karab436b9b2009-12-08 23:51:10 -05004518 /*
Aneesh Kumar K.V5f634d02010-01-25 04:00:31 -05004519 * Update reserved blocks/metadata blocks after successful
4520 * block allocation which had been deferred till now.
4521 */
Aditya Kali7b415bf2011-09-09 19:04:51 -04004522 if (flags & EXT4_GET_BLOCKS_DELALLOC_RESERVE) {
Yongqiang Yang81fdbb42011-10-29 09:23:38 -04004523 unsigned int reserved_clusters;
Aditya Kali7b415bf2011-09-09 19:04:51 -04004524 /*
Yongqiang Yang81fdbb42011-10-29 09:23:38 -04004525 * Check how many clusters we had reserved this allocated range
Aditya Kali7b415bf2011-09-09 19:04:51 -04004526 */
4527 reserved_clusters = get_reserved_cluster_alloc(inode,
4528 map->m_lblk, allocated);
4529 if (map->m_flags & EXT4_MAP_FROM_CLUSTER) {
4530 if (reserved_clusters) {
4531 /*
4532 * We have clusters reserved for this range.
4533 * But since we are not doing actual allocation
4534 * and are simply using blocks from previously
4535 * allocated cluster, we should release the
4536 * reservation and not claim quota.
4537 */
4538 ext4_da_update_reserve_space(inode,
4539 reserved_clusters, 0);
4540 }
4541 } else {
4542 BUG_ON(allocated_clusters < reserved_clusters);
Aditya Kali7b415bf2011-09-09 19:04:51 -04004543 if (reserved_clusters < allocated_clusters) {
Aditya Kali5356f262011-09-09 19:20:51 -04004544 struct ext4_inode_info *ei = EXT4_I(inode);
Aditya Kali7b415bf2011-09-09 19:04:51 -04004545 int reservation = allocated_clusters -
4546 reserved_clusters;
4547 /*
4548 * It seems we claimed few clusters outside of
4549 * the range of this allocation. We should give
4550 * it back to the reservation pool. This can
4551 * happen in the following case:
4552 *
4553 * * Suppose s_cluster_ratio is 4 (i.e., each
4554 * cluster has 4 blocks. Thus, the clusters
4555 * are [0-3],[4-7],[8-11]...
4556 * * First comes delayed allocation write for
4557 * logical blocks 10 & 11. Since there were no
4558 * previous delayed allocated blocks in the
4559 * range [8-11], we would reserve 1 cluster
4560 * for this write.
4561 * * Next comes write for logical blocks 3 to 8.
4562 * In this case, we will reserve 2 clusters
4563 * (for [0-3] and [4-7]; and not for [8-11] as
4564 * that range has a delayed allocated blocks.
4565 * Thus total reserved clusters now becomes 3.
4566 * * Now, during the delayed allocation writeout
4567 * time, we will first write blocks [3-8] and
4568 * allocate 3 clusters for writing these
4569 * blocks. Also, we would claim all these
4570 * three clusters above.
4571 * * Now when we come here to writeout the
4572 * blocks [10-11], we would expect to claim
4573 * the reservation of 1 cluster we had made
4574 * (and we would claim it since there are no
4575 * more delayed allocated blocks in the range
4576 * [8-11]. But our reserved cluster count had
4577 * already gone to 0.
4578 *
4579 * Thus, at the step 4 above when we determine
4580 * that there are still some unwritten delayed
4581 * allocated blocks outside of our current
4582 * block range, we should increment the
4583 * reserved clusters count so that when the
4584 * remaining blocks finally gets written, we
4585 * could claim them.
4586 */
Aditya Kali5356f262011-09-09 19:20:51 -04004587 dquot_reserve_block(inode,
4588 EXT4_C2B(sbi, reservation));
4589 spin_lock(&ei->i_block_reservation_lock);
4590 ei->i_reserved_data_blocks += reservation;
4591 spin_unlock(&ei->i_block_reservation_lock);
Aditya Kali7b415bf2011-09-09 19:04:51 -04004592 }
Lukas Czerner232ec872013-03-10 22:46:30 -04004593 /*
4594 * We will claim quota for all newly allocated blocks.
4595 * We're updating the reserved space *after* the
4596 * correction above so we do not accidentally free
4597 * all the metadata reservation because we might
4598 * actually need it later on.
4599 */
4600 ext4_da_update_reserve_space(inode, allocated_clusters,
4601 1);
Aditya Kali7b415bf2011-09-09 19:04:51 -04004602 }
4603 }
Aneesh Kumar K.V5f634d02010-01-25 04:00:31 -05004604
4605 /*
Jan Karab436b9b2009-12-08 23:51:10 -05004606 * Cache the extent and update transaction to commit on fdatasync only
Lukas Czerner556615d2014-04-20 23:45:47 -04004607 * when it is _not_ an unwritten extent.
Jan Karab436b9b2009-12-08 23:51:10 -05004608 */
Lukas Czerner556615d2014-04-20 23:45:47 -04004609 if ((flags & EXT4_GET_BLOCKS_UNWRIT_EXT) == 0)
Jan Karab436b9b2009-12-08 23:51:10 -05004610 ext4_update_inode_fsync_trans(handle, inode, 1);
Zheng Liu69eb33d2013-02-18 00:31:07 -05004611 else
Jan Karab436b9b2009-12-08 23:51:10 -05004612 ext4_update_inode_fsync_trans(handle, inode, 0);
Alex Tomasa86c6182006-10-11 01:21:03 -07004613out:
Theodore Ts'oe35fd662010-05-16 19:00:00 -04004614 if (allocated > map->m_len)
4615 allocated = map->m_len;
Alex Tomasa86c6182006-10-11 01:21:03 -07004616 ext4_ext_show_leaf(inode, path);
Theodore Ts'oe35fd662010-05-16 19:00:00 -04004617 map->m_flags |= EXT4_MAP_MAPPED;
4618 map->m_pblk = newblock;
4619 map->m_len = allocated;
Alex Tomasa86c6182006-10-11 01:21:03 -07004620out2:
4621 if (path) {
4622 ext4_ext_drop_refs(path);
4623 kfree(path);
4624 }
Allison Hendersone8613042011-05-25 07:41:46 -04004625
Theodore Ts'o63b99962013-07-16 10:28:47 -04004626 trace_ext4_ext_map_blocks_exit(inode, flags, map,
4627 err ? err : allocated);
4628 ext4_es_lru_add(inode);
Lukas Czerner78771912012-03-19 23:05:43 -04004629 return err ? err : allocated;
Alex Tomasa86c6182006-10-11 01:21:03 -07004630}
4631
Theodore Ts'o819c4922013-04-03 12:47:17 -04004632void ext4_ext_truncate(handle_t *handle, struct inode *inode)
Alex Tomasa86c6182006-10-11 01:21:03 -07004633{
Alex Tomasa86c6182006-10-11 01:21:03 -07004634 struct super_block *sb = inode->i_sb;
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05004635 ext4_lblk_t last_block;
Alex Tomasa86c6182006-10-11 01:21:03 -07004636 int err = 0;
4637
4638 /*
Randy Dunlapd0d856e2006-10-11 01:21:07 -07004639 * TODO: optimization is possible here.
4640 * Probably we need not scan at all,
4641 * because page truncation is enough.
Alex Tomasa86c6182006-10-11 01:21:03 -07004642 */
Alex Tomasa86c6182006-10-11 01:21:03 -07004643
4644 /* we have to know where to truncate from in crash case */
4645 EXT4_I(inode)->i_disksize = inode->i_size;
4646 ext4_mark_inode_dirty(handle, inode);
4647
4648 last_block = (inode->i_size + sb->s_blocksize - 1)
4649 >> EXT4_BLOCK_SIZE_BITS(sb);
Theodore Ts'o8acd5e92013-07-15 00:09:19 -04004650retry:
Zheng Liu51865fd2012-11-08 21:57:32 -05004651 err = ext4_es_remove_extent(inode, last_block,
4652 EXT_MAX_BLOCKS - last_block);
Theodore Ts'o94eec0f2013-07-29 12:12:56 -04004653 if (err == -ENOMEM) {
Theodore Ts'o8acd5e92013-07-15 00:09:19 -04004654 cond_resched();
4655 congestion_wait(BLK_RW_ASYNC, HZ/50);
4656 goto retry;
4657 }
4658 if (err) {
4659 ext4_std_error(inode->i_sb, err);
4660 return;
4661 }
Lukas Czerner5f95d212012-03-19 23:03:19 -04004662 err = ext4_ext_remove_space(inode, last_block, EXT_MAX_BLOCKS - 1);
Theodore Ts'o8acd5e92013-07-15 00:09:19 -04004663 ext4_std_error(inode->i_sb, err);
Alex Tomasa86c6182006-10-11 01:21:03 -07004664}
4665
Lukas Czerner0e8b6872014-03-18 18:03:51 -04004666static int ext4_alloc_file_blocks(struct file *file, ext4_lblk_t offset,
4667 ext4_lblk_t len, int flags, int mode)
Amit Aroraa2df2a62007-07-17 21:42:41 -04004668{
Al Viro496ad9a2013-01-23 17:07:38 -05004669 struct inode *inode = file_inode(file);
Amit Aroraa2df2a62007-07-17 21:42:41 -04004670 handle_t *handle;
Amit Aroraa2df2a62007-07-17 21:42:41 -04004671 int ret = 0;
4672 int ret2 = 0;
4673 int retries = 0;
Theodore Ts'o2ed88682010-05-16 20:00:00 -04004674 struct ext4_map_blocks map;
Lukas Czerner0e8b6872014-03-18 18:03:51 -04004675 unsigned int credits;
Amit Aroraa2df2a62007-07-17 21:42:41 -04004676
Lukas Czerner0e8b6872014-03-18 18:03:51 -04004677 map.m_lblk = offset;
Greg Harm3c6fe772011-10-31 18:41:47 -04004678 /*
4679 * Don't normalize the request if it can fit in one extent so
4680 * that it doesn't get unnecessarily split into multiple
4681 * extents.
4682 */
Lukas Czerner556615d2014-04-20 23:45:47 -04004683 if (len <= EXT_UNWRITTEN_MAX_LEN)
Greg Harm3c6fe772011-10-31 18:41:47 -04004684 flags |= EXT4_GET_BLOCKS_NO_NORMALIZE;
Dmitry Monakhov60d46162012-10-05 11:32:02 -04004685
Lukas Czerner0e8b6872014-03-18 18:03:51 -04004686 /*
4687 * credits to insert 1 extent into extent tree
4688 */
4689 credits = ext4_chunk_trans_blocks(inode, len);
4690
Amit Aroraa2df2a62007-07-17 21:42:41 -04004691retry:
Lukas Czerner0e8b6872014-03-18 18:03:51 -04004692 while (ret >= 0 && ret < len) {
Theodore Ts'o2ed88682010-05-16 20:00:00 -04004693 map.m_lblk = map.m_lblk + ret;
Lukas Czerner0e8b6872014-03-18 18:03:51 -04004694 map.m_len = len = len - ret;
Theodore Ts'o9924a922013-02-08 21:59:22 -05004695 handle = ext4_journal_start(inode, EXT4_HT_MAP_BLOCKS,
4696 credits);
Amit Aroraa2df2a62007-07-17 21:42:41 -04004697 if (IS_ERR(handle)) {
4698 ret = PTR_ERR(handle);
4699 break;
4700 }
Dmitry Monakhova4e5d882011-10-25 08:15:12 -04004701 ret = ext4_map_blocks(handle, inode, &map, flags);
Aneesh Kumar K.V221879c2008-01-28 23:58:27 -05004702 if (ret <= 0) {
Lukas Czernerf282ac12014-03-18 17:44:35 -04004703 ext4_debug("inode #%lu: block %u: len %u: "
4704 "ext4_ext_map_blocks returned %d",
4705 inode->i_ino, map.m_lblk,
4706 map.m_len, ret);
Amit Aroraa2df2a62007-07-17 21:42:41 -04004707 ext4_mark_inode_dirty(handle, inode);
4708 ret2 = ext4_journal_stop(handle);
4709 break;
4710 }
Amit Aroraa2df2a62007-07-17 21:42:41 -04004711 ret2 = ext4_journal_stop(handle);
4712 if (ret2)
4713 break;
4714 }
Aneesh Kumar K.Vfd287842008-04-29 08:11:12 -04004715 if (ret == -ENOSPC &&
4716 ext4_should_retry_alloc(inode->i_sb, &retries)) {
4717 ret = 0;
Amit Aroraa2df2a62007-07-17 21:42:41 -04004718 goto retry;
Amit Aroraa2df2a62007-07-17 21:42:41 -04004719 }
Lukas Czernerf282ac12014-03-18 17:44:35 -04004720
Lukas Czerner0e8b6872014-03-18 18:03:51 -04004721 return ret > 0 ? ret2 : ret;
4722}
4723
Lukas Czernerb8a86842014-03-18 18:05:35 -04004724static long ext4_zero_range(struct file *file, loff_t offset,
4725 loff_t len, int mode)
4726{
4727 struct inode *inode = file_inode(file);
4728 handle_t *handle = NULL;
4729 unsigned int max_blocks;
4730 loff_t new_size = 0;
4731 int ret = 0;
4732 int flags;
4733 int partial;
4734 loff_t start, end;
4735 ext4_lblk_t lblk;
4736 struct address_space *mapping = inode->i_mapping;
4737 unsigned int blkbits = inode->i_blkbits;
4738
4739 trace_ext4_zero_range(inode, offset, len, mode);
4740
jon ernst6c5e73d2014-04-18 11:50:35 -04004741 if (!S_ISREG(inode->i_mode))
4742 return -EINVAL;
4743
Namjae Jeone1ee60f2014-05-27 12:48:55 -04004744 /* Call ext4_force_commit to flush all data in case of data=journal. */
4745 if (ext4_should_journal_data(inode)) {
4746 ret = ext4_force_commit(inode->i_sb);
4747 if (ret)
4748 return ret;
4749 }
4750
Lukas Czernerb8a86842014-03-18 18:05:35 -04004751 /*
4752 * Write out all dirty pages to avoid race conditions
4753 * Then release them.
4754 */
4755 if (mapping->nrpages && mapping_tagged(mapping, PAGECACHE_TAG_DIRTY)) {
4756 ret = filemap_write_and_wait_range(mapping, offset,
4757 offset + len - 1);
4758 if (ret)
4759 return ret;
4760 }
4761
4762 /*
4763 * Round up offset. This is not fallocate, we neet to zero out
4764 * blocks, so convert interior block aligned part of the range to
4765 * unwritten and possibly manually zero out unaligned parts of the
4766 * range.
4767 */
4768 start = round_up(offset, 1 << blkbits);
4769 end = round_down((offset + len), 1 << blkbits);
4770
4771 if (start < offset || end > offset + len)
4772 return -EINVAL;
4773 partial = (offset + len) & ((1 << blkbits) - 1);
4774
4775 lblk = start >> blkbits;
4776 max_blocks = (end >> blkbits);
4777 if (max_blocks < lblk)
4778 max_blocks = 0;
4779 else
4780 max_blocks -= lblk;
4781
Lukas Czerner556615d2014-04-20 23:45:47 -04004782 flags = EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT |
Lukas Czernerb8a86842014-03-18 18:05:35 -04004783 EXT4_GET_BLOCKS_CONVERT_UNWRITTEN;
4784 if (mode & FALLOC_FL_KEEP_SIZE)
4785 flags |= EXT4_GET_BLOCKS_KEEP_SIZE;
4786
4787 mutex_lock(&inode->i_mutex);
4788
4789 /*
4790 * Indirect files do not support unwritten extnets
4791 */
4792 if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) {
4793 ret = -EOPNOTSUPP;
4794 goto out_mutex;
4795 }
4796
4797 if (!(mode & FALLOC_FL_KEEP_SIZE) &&
4798 offset + len > i_size_read(inode)) {
4799 new_size = offset + len;
4800 ret = inode_newsize_ok(inode, new_size);
4801 if (ret)
4802 goto out_mutex;
4803 /*
4804 * If we have a partial block after EOF we have to allocate
4805 * the entire block.
4806 */
4807 if (partial)
4808 max_blocks += 1;
4809 }
4810
4811 if (max_blocks > 0) {
4812
4813 /* Now release the pages and zero block aligned part of pages*/
4814 truncate_pagecache_range(inode, start, end - 1);
4815
4816 /* Wait all existing dio workers, newcomers will block on i_mutex */
4817 ext4_inode_block_unlocked_dio(inode);
4818 inode_dio_wait(inode);
4819
4820 /*
4821 * Remove entire range from the extent status tree.
4822 */
4823 ret = ext4_es_remove_extent(inode, lblk, max_blocks);
4824 if (ret)
4825 goto out_dio;
4826
4827 ret = ext4_alloc_file_blocks(file, lblk, max_blocks, flags,
4828 mode);
4829 if (ret)
4830 goto out_dio;
4831 }
4832
4833 handle = ext4_journal_start(inode, EXT4_HT_MISC, 4);
4834 if (IS_ERR(handle)) {
4835 ret = PTR_ERR(handle);
4836 ext4_std_error(inode->i_sb, ret);
4837 goto out_dio;
4838 }
4839
4840 inode->i_mtime = inode->i_ctime = ext4_current_time(inode);
4841
Lukas Czernere5b30412014-04-01 00:59:21 -04004842 if (new_size) {
Lukas Czernerb8a86842014-03-18 18:05:35 -04004843 if (new_size > i_size_read(inode))
4844 i_size_write(inode, new_size);
4845 if (new_size > EXT4_I(inode)->i_disksize)
4846 ext4_update_i_disksize(inode, new_size);
Lukas Czernere5b30412014-04-01 00:59:21 -04004847 } else {
Lukas Czernerb8a86842014-03-18 18:05:35 -04004848 /*
4849 * Mark that we allocate beyond EOF so the subsequent truncate
4850 * can proceed even if the new size is the same as i_size.
4851 */
4852 if ((offset + len) > i_size_read(inode))
4853 ext4_set_inode_flag(inode, EXT4_INODE_EOFBLOCKS);
4854 }
4855
4856 ext4_mark_inode_dirty(handle, inode);
4857
4858 /* Zero out partial block at the edges of the range */
4859 ret = ext4_zero_partial_blocks(handle, inode, offset, len);
4860
4861 if (file->f_flags & O_SYNC)
4862 ext4_handle_sync(handle);
4863
4864 ext4_journal_stop(handle);
4865out_dio:
4866 ext4_inode_resume_unlocked_dio(inode);
4867out_mutex:
4868 mutex_unlock(&inode->i_mutex);
4869 return ret;
4870}
4871
Lukas Czerner0e8b6872014-03-18 18:03:51 -04004872/*
4873 * preallocate space for a file. This implements ext4's fallocate file
4874 * operation, which gets called from sys_fallocate system call.
4875 * For block-mapped files, posix_fallocate should fall back to the method
4876 * of writing zeroes to the required new blocks (the same behavior which is
4877 * expected for file systems which do not support fallocate() system call).
4878 */
4879long ext4_fallocate(struct file *file, int mode, loff_t offset, loff_t len)
4880{
4881 struct inode *inode = file_inode(file);
4882 handle_t *handle;
4883 loff_t new_size = 0;
4884 unsigned int max_blocks;
4885 int ret = 0;
4886 int flags;
4887 ext4_lblk_t lblk;
4888 struct timespec tv;
4889 unsigned int blkbits = inode->i_blkbits;
4890
4891 /* Return error if mode is not supported */
4892 if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE |
Lukas Czernerb8a86842014-03-18 18:05:35 -04004893 FALLOC_FL_COLLAPSE_RANGE | FALLOC_FL_ZERO_RANGE))
Lukas Czerner0e8b6872014-03-18 18:03:51 -04004894 return -EOPNOTSUPP;
4895
4896 if (mode & FALLOC_FL_PUNCH_HOLE)
4897 return ext4_punch_hole(inode, offset, len);
4898
Lukas Czerner0e8b6872014-03-18 18:03:51 -04004899 ret = ext4_convert_inline_data(inode);
4900 if (ret)
4901 return ret;
4902
4903 /*
4904 * currently supporting (pre)allocate mode for extent-based
4905 * files _only_
4906 */
4907 if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)))
4908 return -EOPNOTSUPP;
4909
Theodore Ts'o40c406c2014-04-12 22:53:53 -04004910 if (mode & FALLOC_FL_COLLAPSE_RANGE)
4911 return ext4_collapse_range(inode, offset, len);
4912
Lukas Czernerb8a86842014-03-18 18:05:35 -04004913 if (mode & FALLOC_FL_ZERO_RANGE)
4914 return ext4_zero_range(file, offset, len, mode);
4915
Lukas Czerner0e8b6872014-03-18 18:03:51 -04004916 trace_ext4_fallocate_enter(inode, offset, len, mode);
4917 lblk = offset >> blkbits;
4918 /*
4919 * We can't just convert len to max_blocks because
4920 * If blocksize = 4096 offset = 3072 and len = 2048
4921 */
4922 max_blocks = (EXT4_BLOCK_ALIGN(len + offset, blkbits) >> blkbits)
4923 - lblk;
4924
Lukas Czerner556615d2014-04-20 23:45:47 -04004925 flags = EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT;
Lukas Czerner0e8b6872014-03-18 18:03:51 -04004926 if (mode & FALLOC_FL_KEEP_SIZE)
4927 flags |= EXT4_GET_BLOCKS_KEEP_SIZE;
4928
4929 mutex_lock(&inode->i_mutex);
4930
4931 if (!(mode & FALLOC_FL_KEEP_SIZE) &&
4932 offset + len > i_size_read(inode)) {
4933 new_size = offset + len;
4934 ret = inode_newsize_ok(inode, new_size);
4935 if (ret)
4936 goto out;
4937 }
4938
4939 ret = ext4_alloc_file_blocks(file, lblk, max_blocks, flags, mode);
4940 if (ret)
4941 goto out;
4942
Lukas Czernerf282ac12014-03-18 17:44:35 -04004943 handle = ext4_journal_start(inode, EXT4_HT_INODE, 2);
4944 if (IS_ERR(handle))
4945 goto out;
4946
4947 tv = inode->i_ctime = ext4_current_time(inode);
4948
Lukas Czernere5b30412014-04-01 00:59:21 -04004949 if (new_size) {
Lukas Czernerf282ac12014-03-18 17:44:35 -04004950 if (new_size > i_size_read(inode)) {
4951 i_size_write(inode, new_size);
4952 inode->i_mtime = tv;
4953 }
4954 if (new_size > EXT4_I(inode)->i_disksize)
4955 ext4_update_i_disksize(inode, new_size);
Lukas Czernere5b30412014-04-01 00:59:21 -04004956 } else {
Lukas Czernerf282ac12014-03-18 17:44:35 -04004957 /*
4958 * Mark that we allocate beyond EOF so the subsequent truncate
4959 * can proceed even if the new size is the same as i_size.
4960 */
4961 if ((offset + len) > i_size_read(inode))
4962 ext4_set_inode_flag(inode, EXT4_INODE_EOFBLOCKS);
4963 }
4964 ext4_mark_inode_dirty(handle, inode);
4965 if (file->f_flags & O_SYNC)
4966 ext4_handle_sync(handle);
4967
4968 ext4_journal_stop(handle);
4969out:
Aneesh Kumar K.V55bd7252008-02-15 12:47:21 -05004970 mutex_unlock(&inode->i_mutex);
Lukas Czerner0e8b6872014-03-18 18:03:51 -04004971 trace_ext4_fallocate_exit(inode, offset, max_blocks, ret);
4972 return ret;
Amit Aroraa2df2a62007-07-17 21:42:41 -04004973}
Eric Sandeen6873fa02008-10-07 00:46:36 -04004974
4975/*
Mingming Cao00314622009-09-28 15:49:08 -04004976 * This function convert a range of blocks to written extents
4977 * The caller of this function will pass the start offset and the size.
4978 * all unwritten extents within this range will be converted to
4979 * written extents.
4980 *
4981 * This function is called from the direct IO end io call back
4982 * function, to convert the fallocated extents after IO is completed.
Mingming109f5562009-11-10 10:48:08 -05004983 * Returns 0 on success.
Mingming Cao00314622009-09-28 15:49:08 -04004984 */
Jan Kara6b523df2013-06-04 13:21:11 -04004985int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode,
4986 loff_t offset, ssize_t len)
Mingming Cao00314622009-09-28 15:49:08 -04004987{
Mingming Cao00314622009-09-28 15:49:08 -04004988 unsigned int max_blocks;
4989 int ret = 0;
4990 int ret2 = 0;
Theodore Ts'o2ed88682010-05-16 20:00:00 -04004991 struct ext4_map_blocks map;
Mingming Cao00314622009-09-28 15:49:08 -04004992 unsigned int credits, blkbits = inode->i_blkbits;
4993
Theodore Ts'o2ed88682010-05-16 20:00:00 -04004994 map.m_lblk = offset >> blkbits;
Mingming Cao00314622009-09-28 15:49:08 -04004995 /*
4996 * We can't just convert len to max_blocks because
4997 * If blocksize = 4096 offset = 3072 and len = 2048
4998 */
Theodore Ts'o2ed88682010-05-16 20:00:00 -04004999 max_blocks = ((EXT4_BLOCK_ALIGN(len + offset, blkbits) >> blkbits) -
5000 map.m_lblk);
Mingming Cao00314622009-09-28 15:49:08 -04005001 /*
Jan Kara6b523df2013-06-04 13:21:11 -04005002 * This is somewhat ugly but the idea is clear: When transaction is
5003 * reserved, everything goes into it. Otherwise we rather start several
5004 * smaller transactions for conversion of each extent separately.
Mingming Cao00314622009-09-28 15:49:08 -04005005 */
Jan Kara6b523df2013-06-04 13:21:11 -04005006 if (handle) {
5007 handle = ext4_journal_start_reserved(handle,
5008 EXT4_HT_EXT_CONVERT);
5009 if (IS_ERR(handle))
5010 return PTR_ERR(handle);
5011 credits = 0;
5012 } else {
5013 /*
5014 * credits to insert 1 extent into extent tree
5015 */
5016 credits = ext4_chunk_trans_blocks(inode, max_blocks);
5017 }
Mingming Cao00314622009-09-28 15:49:08 -04005018 while (ret >= 0 && ret < max_blocks) {
Theodore Ts'o2ed88682010-05-16 20:00:00 -04005019 map.m_lblk += ret;
5020 map.m_len = (max_blocks -= ret);
Jan Kara6b523df2013-06-04 13:21:11 -04005021 if (credits) {
5022 handle = ext4_journal_start(inode, EXT4_HT_MAP_BLOCKS,
5023 credits);
5024 if (IS_ERR(handle)) {
5025 ret = PTR_ERR(handle);
5026 break;
5027 }
Mingming Cao00314622009-09-28 15:49:08 -04005028 }
Theodore Ts'o2ed88682010-05-16 20:00:00 -04005029 ret = ext4_map_blocks(handle, inode, &map,
Jiaying Zhangc7064ef2010-03-02 13:28:44 -05005030 EXT4_GET_BLOCKS_IO_CONVERT_EXT);
Lukas Czernerb06acd32013-01-28 21:21:12 -05005031 if (ret <= 0)
5032 ext4_warning(inode->i_sb,
5033 "inode #%lu: block %u: len %u: "
5034 "ext4_ext_map_blocks returned %d",
5035 inode->i_ino, map.m_lblk,
5036 map.m_len, ret);
Mingming Cao00314622009-09-28 15:49:08 -04005037 ext4_mark_inode_dirty(handle, inode);
Jan Kara6b523df2013-06-04 13:21:11 -04005038 if (credits)
5039 ret2 = ext4_journal_stop(handle);
5040 if (ret <= 0 || ret2)
Mingming Cao00314622009-09-28 15:49:08 -04005041 break;
5042 }
Jan Kara6b523df2013-06-04 13:21:11 -04005043 if (!credits)
5044 ret2 = ext4_journal_stop(handle);
Mingming Cao00314622009-09-28 15:49:08 -04005045 return ret > 0 ? ret2 : ret;
5046}
Yongqiang Yang6d9c85e2011-02-27 17:25:47 -05005047
Mingming Cao00314622009-09-28 15:49:08 -04005048/*
Zheng Liu69eb33d2013-02-18 00:31:07 -05005049 * If newes is not existing extent (newes->ec_pblk equals zero) find
5050 * delayed extent at start of newes and update newes accordingly and
Lukas Czerner91dd8c12012-11-28 12:32:26 -05005051 * return start of the next delayed extent.
5052 *
Zheng Liu69eb33d2013-02-18 00:31:07 -05005053 * If newes is existing extent (newes->ec_pblk is not equal zero)
Lukas Czerner91dd8c12012-11-28 12:32:26 -05005054 * return start of next delayed extent or EXT_MAX_BLOCKS if no delayed
Zheng Liu69eb33d2013-02-18 00:31:07 -05005055 * extent found. Leave newes unmodified.
Eric Sandeen6873fa02008-10-07 00:46:36 -04005056 */
Lukas Czerner91dd8c12012-11-28 12:32:26 -05005057static int ext4_find_delayed_extent(struct inode *inode,
Zheng Liu69eb33d2013-02-18 00:31:07 -05005058 struct extent_status *newes)
Eric Sandeen6873fa02008-10-07 00:46:36 -04005059{
Zheng Liub3aff3e2012-11-08 21:57:37 -05005060 struct extent_status es;
Zheng Liube401362013-02-18 00:27:26 -05005061 ext4_lblk_t block, next_del;
Eric Sandeen6873fa02008-10-07 00:46:36 -04005062
Zheng Liu69eb33d2013-02-18 00:31:07 -05005063 if (newes->es_pblk == 0) {
Yan, Zhenge30b5dc2013-05-03 02:15:52 -04005064 ext4_es_find_delayed_extent_range(inode, newes->es_lblk,
5065 newes->es_lblk + newes->es_len - 1, &es);
5066
Yongqiang Yang6d9c85e2011-02-27 17:25:47 -05005067 /*
Zheng Liu69eb33d2013-02-18 00:31:07 -05005068 * No extent in extent-tree contains block @newes->es_pblk,
Yongqiang Yang6d9c85e2011-02-27 17:25:47 -05005069 * then the block may stay in 1)a hole or 2)delayed-extent.
Yongqiang Yang6d9c85e2011-02-27 17:25:47 -05005070 */
Zheng Liu06b0c882013-02-18 00:26:51 -05005071 if (es.es_len == 0)
Zheng Liub3aff3e2012-11-08 21:57:37 -05005072 /* A hole found. */
Lukas Czerner91dd8c12012-11-28 12:32:26 -05005073 return 0;
Yongqiang Yang6d9c85e2011-02-27 17:25:47 -05005074
Zheng Liu69eb33d2013-02-18 00:31:07 -05005075 if (es.es_lblk > newes->es_lblk) {
Zheng Liub3aff3e2012-11-08 21:57:37 -05005076 /* A hole found. */
Zheng Liu69eb33d2013-02-18 00:31:07 -05005077 newes->es_len = min(es.es_lblk - newes->es_lblk,
5078 newes->es_len);
Lukas Czerner91dd8c12012-11-28 12:32:26 -05005079 return 0;
Eric Sandeen6873fa02008-10-07 00:46:36 -04005080 }
Yongqiang Yang6d9c85e2011-02-27 17:25:47 -05005081
Zheng Liu69eb33d2013-02-18 00:31:07 -05005082 newes->es_len = es.es_lblk + es.es_len - newes->es_lblk;
Eric Sandeen6873fa02008-10-07 00:46:36 -04005083 }
5084
Zheng Liu69eb33d2013-02-18 00:31:07 -05005085 block = newes->es_lblk + newes->es_len;
Yan, Zhenge30b5dc2013-05-03 02:15:52 -04005086 ext4_es_find_delayed_extent_range(inode, block, EXT_MAX_BLOCKS, &es);
Zheng Liube401362013-02-18 00:27:26 -05005087 if (es.es_len == 0)
5088 next_del = EXT_MAX_BLOCKS;
5089 else
5090 next_del = es.es_lblk;
5091
Lukas Czerner91dd8c12012-11-28 12:32:26 -05005092 return next_del;
Eric Sandeen6873fa02008-10-07 00:46:36 -04005093}
Eric Sandeen6873fa02008-10-07 00:46:36 -04005094/* fiemap flags we can handle specified here */
5095#define EXT4_FIEMAP_FLAGS (FIEMAP_FLAG_SYNC|FIEMAP_FLAG_XATTR)
5096
Aneesh Kumar K.V3a06d772008-11-22 15:04:59 -05005097static int ext4_xattr_fiemap(struct inode *inode,
5098 struct fiemap_extent_info *fieinfo)
Eric Sandeen6873fa02008-10-07 00:46:36 -04005099{
5100 __u64 physical = 0;
5101 __u64 length;
5102 __u32 flags = FIEMAP_EXTENT_LAST;
5103 int blockbits = inode->i_sb->s_blocksize_bits;
5104 int error = 0;
5105
5106 /* in-inode? */
Theodore Ts'o19f5fb72010-01-24 14:34:07 -05005107 if (ext4_test_inode_state(inode, EXT4_STATE_XATTR)) {
Eric Sandeen6873fa02008-10-07 00:46:36 -04005108 struct ext4_iloc iloc;
5109 int offset; /* offset of xattr in inode */
5110
5111 error = ext4_get_inode_loc(inode, &iloc);
5112 if (error)
5113 return error;
Jan Karaa60697f2013-05-31 19:38:56 -04005114 physical = (__u64)iloc.bh->b_blocknr << blockbits;
Eric Sandeen6873fa02008-10-07 00:46:36 -04005115 offset = EXT4_GOOD_OLD_INODE_SIZE +
5116 EXT4_I(inode)->i_extra_isize;
5117 physical += offset;
5118 length = EXT4_SB(inode->i_sb)->s_inode_size - offset;
5119 flags |= FIEMAP_EXTENT_DATA_INLINE;
Curt Wohlgemuthfd2dd9f2010-04-03 17:44:16 -04005120 brelse(iloc.bh);
Eric Sandeen6873fa02008-10-07 00:46:36 -04005121 } else { /* external block */
Jan Karaa60697f2013-05-31 19:38:56 -04005122 physical = (__u64)EXT4_I(inode)->i_file_acl << blockbits;
Eric Sandeen6873fa02008-10-07 00:46:36 -04005123 length = inode->i_sb->s_blocksize;
5124 }
5125
5126 if (physical)
5127 error = fiemap_fill_next_extent(fieinfo, 0, physical,
5128 length, flags);
5129 return (error < 0 ? error : 0);
5130}
5131
5132int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
5133 __u64 start, __u64 len)
5134{
5135 ext4_lblk_t start_blk;
Eric Sandeen6873fa02008-10-07 00:46:36 -04005136 int error = 0;
5137
Tao Ma94191982012-12-10 14:06:02 -05005138 if (ext4_has_inline_data(inode)) {
5139 int has_inline = 1;
5140
5141 error = ext4_inline_data_fiemap(inode, fieinfo, &has_inline);
5142
5143 if (has_inline)
5144 return error;
5145 }
5146
Theodore Ts'o7869a4a2013-08-16 22:05:14 -04005147 if (fieinfo->fi_flags & FIEMAP_FLAG_CACHE) {
5148 error = ext4_ext_precache(inode);
5149 if (error)
5150 return error;
5151 }
5152
Eric Sandeen6873fa02008-10-07 00:46:36 -04005153 /* fallback to generic here if not in extents fmt */
Dmitry Monakhov12e9b892010-05-16 22:00:00 -04005154 if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)))
Eric Sandeen6873fa02008-10-07 00:46:36 -04005155 return generic_block_fiemap(inode, fieinfo, start, len,
5156 ext4_get_block);
5157
5158 if (fiemap_check_flags(fieinfo, EXT4_FIEMAP_FLAGS))
5159 return -EBADR;
5160
5161 if (fieinfo->fi_flags & FIEMAP_FLAG_XATTR) {
5162 error = ext4_xattr_fiemap(inode, fieinfo);
5163 } else {
Leonard Michlmayraca92ff2010-03-04 17:07:28 -05005164 ext4_lblk_t len_blks;
5165 __u64 last_blk;
5166
Eric Sandeen6873fa02008-10-07 00:46:36 -04005167 start_blk = start >> inode->i_sb->s_blocksize_bits;
Leonard Michlmayraca92ff2010-03-04 17:07:28 -05005168 last_blk = (start + len - 1) >> inode->i_sb->s_blocksize_bits;
Lukas Czernerf17722f2011-06-06 00:05:17 -04005169 if (last_blk >= EXT_MAX_BLOCKS)
5170 last_blk = EXT_MAX_BLOCKS-1;
Leonard Michlmayraca92ff2010-03-04 17:07:28 -05005171 len_blks = ((ext4_lblk_t) last_blk) - start_blk + 1;
Eric Sandeen6873fa02008-10-07 00:46:36 -04005172
5173 /*
Lukas Czerner91dd8c12012-11-28 12:32:26 -05005174 * Walk the extent tree gathering extent information
5175 * and pushing extents back to the user.
Eric Sandeen6873fa02008-10-07 00:46:36 -04005176 */
Lukas Czerner91dd8c12012-11-28 12:32:26 -05005177 error = ext4_fill_fiemap_extents(inode, start_blk,
5178 len_blks, fieinfo);
Eric Sandeen6873fa02008-10-07 00:46:36 -04005179 }
Theodore Ts'o107a7bd2013-08-16 21:23:41 -04005180 ext4_es_lru_add(inode);
Eric Sandeen6873fa02008-10-07 00:46:36 -04005181 return error;
5182}
Namjae Jeon9eb79482014-02-23 15:18:59 -05005183
5184/*
5185 * ext4_access_path:
5186 * Function to access the path buffer for marking it dirty.
5187 * It also checks if there are sufficient credits left in the journal handle
5188 * to update path.
5189 */
5190static int
5191ext4_access_path(handle_t *handle, struct inode *inode,
5192 struct ext4_ext_path *path)
5193{
5194 int credits, err;
5195
5196 if (!ext4_handle_valid(handle))
5197 return 0;
5198
5199 /*
5200 * Check if need to extend journal credits
5201 * 3 for leaf, sb, and inode plus 2 (bmap and group
5202 * descriptor) for each block group; assume two block
5203 * groups
5204 */
5205 if (handle->h_buffer_credits < 7) {
5206 credits = ext4_writepage_trans_blocks(inode);
5207 err = ext4_ext_truncate_extend_restart(handle, inode, credits);
5208 /* EAGAIN is success */
5209 if (err && err != -EAGAIN)
5210 return err;
5211 }
5212
5213 err = ext4_ext_get_access(handle, inode, path);
5214 return err;
5215}
5216
5217/*
5218 * ext4_ext_shift_path_extents:
5219 * Shift the extents of a path structure lying between path[depth].p_ext
5220 * and EXT_LAST_EXTENT(path[depth].p_hdr) downwards, by subtracting shift
5221 * from starting block for each extent.
5222 */
5223static int
5224ext4_ext_shift_path_extents(struct ext4_ext_path *path, ext4_lblk_t shift,
5225 struct inode *inode, handle_t *handle,
5226 ext4_lblk_t *start)
5227{
5228 int depth, err = 0;
5229 struct ext4_extent *ex_start, *ex_last;
5230 bool update = 0;
5231 depth = path->p_depth;
5232
5233 while (depth >= 0) {
5234 if (depth == path->p_depth) {
5235 ex_start = path[depth].p_ext;
5236 if (!ex_start)
5237 return -EIO;
5238
5239 ex_last = EXT_LAST_EXTENT(path[depth].p_hdr);
5240 if (!ex_last)
5241 return -EIO;
5242
5243 err = ext4_access_path(handle, inode, path + depth);
5244 if (err)
5245 goto out;
5246
5247 if (ex_start == EXT_FIRST_EXTENT(path[depth].p_hdr))
5248 update = 1;
5249
Zheng Liu847c6c42014-04-12 12:45:55 -04005250 *start = le32_to_cpu(ex_last->ee_block) +
Namjae Jeon9eb79482014-02-23 15:18:59 -05005251 ext4_ext_get_actual_len(ex_last);
5252
5253 while (ex_start <= ex_last) {
Zheng Liu847c6c42014-04-12 12:45:55 -04005254 le32_add_cpu(&ex_start->ee_block, -shift);
Lukas Czerner6dd834e2014-04-18 10:55:24 -04005255 /* Try to merge to the left. */
5256 if ((ex_start >
5257 EXT_FIRST_EXTENT(path[depth].p_hdr)) &&
5258 ext4_ext_try_to_merge_right(inode,
5259 path, ex_start - 1))
5260 ex_last--;
5261 else
5262 ex_start++;
Namjae Jeon9eb79482014-02-23 15:18:59 -05005263 }
5264 err = ext4_ext_dirty(handle, inode, path + depth);
5265 if (err)
5266 goto out;
5267
5268 if (--depth < 0 || !update)
5269 break;
5270 }
5271
5272 /* Update index too */
5273 err = ext4_access_path(handle, inode, path + depth);
5274 if (err)
5275 goto out;
5276
Zheng Liu847c6c42014-04-12 12:45:55 -04005277 le32_add_cpu(&path[depth].p_idx->ei_block, -shift);
Namjae Jeon9eb79482014-02-23 15:18:59 -05005278 err = ext4_ext_dirty(handle, inode, path + depth);
5279 if (err)
5280 goto out;
5281
5282 /* we are done if current index is not a starting index */
5283 if (path[depth].p_idx != EXT_FIRST_INDEX(path[depth].p_hdr))
5284 break;
5285
5286 depth--;
5287 }
5288
5289out:
5290 return err;
5291}
5292
5293/*
5294 * ext4_ext_shift_extents:
5295 * All the extents which lies in the range from start to the last allocated
5296 * block for the file are shifted downwards by shift blocks.
5297 * On success, 0 is returned, error otherwise.
5298 */
5299static int
5300ext4_ext_shift_extents(struct inode *inode, handle_t *handle,
5301 ext4_lblk_t start, ext4_lblk_t shift)
5302{
5303 struct ext4_ext_path *path;
5304 int ret = 0, depth;
5305 struct ext4_extent *extent;
5306 ext4_lblk_t stop_block, current_block;
5307 ext4_lblk_t ex_start, ex_end;
5308
5309 /* Let path point to the last extent */
5310 path = ext4_ext_find_extent(inode, EXT_MAX_BLOCKS - 1, NULL, 0);
5311 if (IS_ERR(path))
5312 return PTR_ERR(path);
5313
5314 depth = path->p_depth;
5315 extent = path[depth].p_ext;
5316 if (!extent) {
5317 ext4_ext_drop_refs(path);
5318 kfree(path);
5319 return ret;
5320 }
5321
Zheng Liu847c6c42014-04-12 12:45:55 -04005322 stop_block = le32_to_cpu(extent->ee_block) +
5323 ext4_ext_get_actual_len(extent);
Namjae Jeon9eb79482014-02-23 15:18:59 -05005324 ext4_ext_drop_refs(path);
5325 kfree(path);
5326
5327 /* Nothing to shift, if hole is at the end of file */
5328 if (start >= stop_block)
5329 return ret;
5330
5331 /*
5332 * Don't start shifting extents until we make sure the hole is big
5333 * enough to accomodate the shift.
5334 */
5335 path = ext4_ext_find_extent(inode, start - 1, NULL, 0);
Dmitry Monakhov8dc79ec2014-04-13 15:05:42 -04005336 if (IS_ERR(path))
5337 return PTR_ERR(path);
Namjae Jeon9eb79482014-02-23 15:18:59 -05005338 depth = path->p_depth;
5339 extent = path[depth].p_ext;
Dmitry Monakhov8dc79ec2014-04-13 15:05:42 -04005340 if (extent) {
5341 ex_start = le32_to_cpu(extent->ee_block);
5342 ex_end = le32_to_cpu(extent->ee_block) +
Zheng Liu847c6c42014-04-12 12:45:55 -04005343 ext4_ext_get_actual_len(extent);
Dmitry Monakhov8dc79ec2014-04-13 15:05:42 -04005344 } else {
5345 ex_start = 0;
5346 ex_end = 0;
5347 }
Namjae Jeon9eb79482014-02-23 15:18:59 -05005348 ext4_ext_drop_refs(path);
5349 kfree(path);
5350
5351 if ((start == ex_start && shift > ex_start) ||
5352 (shift > start - ex_end))
5353 return -EINVAL;
5354
5355 /* Its safe to start updating extents */
5356 while (start < stop_block) {
5357 path = ext4_ext_find_extent(inode, start, NULL, 0);
5358 if (IS_ERR(path))
5359 return PTR_ERR(path);
5360 depth = path->p_depth;
5361 extent = path[depth].p_ext;
Dmitry Monakhova18ed352014-04-13 15:41:13 -04005362 if (!extent) {
5363 EXT4_ERROR_INODE(inode, "unexpected hole at %lu",
5364 (unsigned long) start);
5365 return -EIO;
5366 }
5367
Zheng Liu847c6c42014-04-12 12:45:55 -04005368 current_block = le32_to_cpu(extent->ee_block);
Namjae Jeon9eb79482014-02-23 15:18:59 -05005369 if (start > current_block) {
5370 /* Hole, move to the next extent */
5371 ret = mext_next_extent(inode, path, &extent);
5372 if (ret != 0) {
5373 ext4_ext_drop_refs(path);
5374 kfree(path);
5375 if (ret == 1)
5376 ret = 0;
5377 break;
5378 }
5379 }
5380 ret = ext4_ext_shift_path_extents(path, shift, inode,
5381 handle, &start);
5382 ext4_ext_drop_refs(path);
5383 kfree(path);
5384 if (ret)
5385 break;
5386 }
5387
5388 return ret;
5389}
5390
5391/*
5392 * ext4_collapse_range:
5393 * This implements the fallocate's collapse range functionality for ext4
5394 * Returns: 0 and non-zero on error.
5395 */
5396int ext4_collapse_range(struct inode *inode, loff_t offset, loff_t len)
5397{
5398 struct super_block *sb = inode->i_sb;
5399 ext4_lblk_t punch_start, punch_stop;
5400 handle_t *handle;
5401 unsigned int credits;
Namjae Jeona8680e02014-04-19 16:37:31 -04005402 loff_t new_size, ioffset;
Namjae Jeon9eb79482014-02-23 15:18:59 -05005403 int ret;
5404
Namjae Jeon9eb79482014-02-23 15:18:59 -05005405 /* Collapse range works only on fs block size aligned offsets. */
5406 if (offset & (EXT4_BLOCK_SIZE(sb) - 1) ||
5407 len & (EXT4_BLOCK_SIZE(sb) - 1))
5408 return -EINVAL;
5409
5410 if (!S_ISREG(inode->i_mode))
Theodore Ts'o86f1ca32014-04-18 11:52:11 -04005411 return -EINVAL;
Namjae Jeon9eb79482014-02-23 15:18:59 -05005412
Namjae Jeon0a04b242014-04-19 16:38:21 -04005413 if (EXT4_SB(inode->i_sb)->s_cluster_ratio > 1)
5414 return -EOPNOTSUPP;
5415
Namjae Jeon9eb79482014-02-23 15:18:59 -05005416 trace_ext4_collapse_range(inode, offset, len);
5417
5418 punch_start = offset >> EXT4_BLOCK_SIZE_BITS(sb);
5419 punch_stop = (offset + len) >> EXT4_BLOCK_SIZE_BITS(sb);
5420
Namjae Jeon1ce01c42014-04-10 22:58:20 -04005421 /* Call ext4_force_commit to flush all data in case of data=journal. */
5422 if (ext4_should_journal_data(inode)) {
5423 ret = ext4_force_commit(inode->i_sb);
5424 if (ret)
5425 return ret;
5426 }
5427
Namjae Jeona8680e02014-04-19 16:37:31 -04005428 /*
5429 * Need to round down offset to be aligned with page size boundary
5430 * for page size > block size.
5431 */
5432 ioffset = round_down(offset, PAGE_SIZE);
5433
Namjae Jeon9eb79482014-02-23 15:18:59 -05005434 /* Write out all dirty pages */
Namjae Jeona8680e02014-04-19 16:37:31 -04005435 ret = filemap_write_and_wait_range(inode->i_mapping, ioffset,
5436 LLONG_MAX);
Namjae Jeon9eb79482014-02-23 15:18:59 -05005437 if (ret)
5438 return ret;
5439
5440 /* Take mutex lock */
5441 mutex_lock(&inode->i_mutex);
5442
Lukas Czerner23fffa92014-04-12 09:56:41 -04005443 /*
5444 * There is no need to overlap collapse range with EOF, in which case
5445 * it is effectively a truncate operation
5446 */
5447 if (offset + len >= i_size_read(inode)) {
5448 ret = -EINVAL;
5449 goto out_mutex;
5450 }
5451
Namjae Jeon9eb79482014-02-23 15:18:59 -05005452 /* Currently just for extent based files */
5453 if (!ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)) {
5454 ret = -EOPNOTSUPP;
5455 goto out_mutex;
5456 }
5457
Namjae Jeona8680e02014-04-19 16:37:31 -04005458 truncate_pagecache(inode, ioffset);
Namjae Jeon9eb79482014-02-23 15:18:59 -05005459
5460 /* Wait for existing dio to complete */
5461 ext4_inode_block_unlocked_dio(inode);
5462 inode_dio_wait(inode);
5463
5464 credits = ext4_writepage_trans_blocks(inode);
5465 handle = ext4_journal_start(inode, EXT4_HT_TRUNCATE, credits);
5466 if (IS_ERR(handle)) {
5467 ret = PTR_ERR(handle);
5468 goto out_dio;
5469 }
5470
5471 down_write(&EXT4_I(inode)->i_data_sem);
5472 ext4_discard_preallocations(inode);
5473
5474 ret = ext4_es_remove_extent(inode, punch_start,
Lukas Czerner2c1d2322014-04-18 10:43:21 -04005475 EXT_MAX_BLOCKS - punch_start);
Namjae Jeon9eb79482014-02-23 15:18:59 -05005476 if (ret) {
5477 up_write(&EXT4_I(inode)->i_data_sem);
5478 goto out_stop;
5479 }
5480
5481 ret = ext4_ext_remove_space(inode, punch_start, punch_stop - 1);
5482 if (ret) {
5483 up_write(&EXT4_I(inode)->i_data_sem);
5484 goto out_stop;
5485 }
Lukas Czerneref24f6c2014-04-18 10:50:23 -04005486 ext4_discard_preallocations(inode);
Namjae Jeon9eb79482014-02-23 15:18:59 -05005487
5488 ret = ext4_ext_shift_extents(inode, handle, punch_stop,
5489 punch_stop - punch_start);
5490 if (ret) {
5491 up_write(&EXT4_I(inode)->i_data_sem);
5492 goto out_stop;
5493 }
5494
5495 new_size = i_size_read(inode) - len;
Lukas Czerner9337d5d2014-04-18 10:48:25 -04005496 i_size_write(inode, new_size);
Namjae Jeon9eb79482014-02-23 15:18:59 -05005497 EXT4_I(inode)->i_disksize = new_size;
5498
Namjae Jeon9eb79482014-02-23 15:18:59 -05005499 up_write(&EXT4_I(inode)->i_data_sem);
5500 if (IS_SYNC(inode))
5501 ext4_handle_sync(handle);
5502 inode->i_mtime = inode->i_ctime = ext4_current_time(inode);
5503 ext4_mark_inode_dirty(handle, inode);
5504
5505out_stop:
5506 ext4_journal_stop(handle);
5507out_dio:
5508 ext4_inode_resume_unlocked_dio(inode);
5509out_mutex:
5510 mutex_unlock(&inode->i_mutex);
5511 return ret;
5512}