blob: 62b21ccea882f349e0d0746795733fae714b3cd2 [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>
Amit Aroraa2df2a62007-07-17 21:42:41 -040040#include <linux/falloc.h>
Alex Tomasa86c6182006-10-11 01:21:03 -070041#include <asm/uaccess.h>
Eric Sandeen6873fa02008-10-07 00:46:36 -040042#include <linux/fiemap.h>
Christoph Hellwig3dcf5452008-04-29 18:13:32 -040043#include "ext4_jbd2.h"
Theodore Ts'o4a092d72012-11-28 13:03:30 -050044#include "ext4_extents.h"
Tao Maf19d5872012-12-10 14:05:51 -050045#include "xattr.h"
Alex Tomasa86c6182006-10-11 01:21:03 -070046
Jiaying Zhang0562e0b2011-03-21 21:38:05 -040047#include <trace/events/ext4.h>
48
Lukas Czerner5f95d212012-03-19 23:03:19 -040049/*
50 * used by extent splitting.
51 */
52#define EXT4_EXT_MAY_ZEROOUT 0x1 /* safe to zeroout if split fails \
53 due to ENOSPC */
54#define EXT4_EXT_MARK_UNINIT1 0x2 /* mark first half uninitialized */
55#define EXT4_EXT_MARK_UNINIT2 0x4 /* mark second half uninitialized */
56
Dmitry Monakhovdee1f972012-10-10 01:04:58 -040057#define EXT4_EXT_DATA_VALID1 0x8 /* first half contains valid data */
58#define EXT4_EXT_DATA_VALID2 0x10 /* second half contains valid data */
59
Darrick J. Wong7ac59902012-04-29 18:37:10 -040060static __le32 ext4_extent_block_csum(struct inode *inode,
61 struct ext4_extent_header *eh)
62{
63 struct ext4_inode_info *ei = EXT4_I(inode);
64 struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
65 __u32 csum;
66
67 csum = ext4_chksum(sbi, ei->i_csum_seed, (__u8 *)eh,
68 EXT4_EXTENT_TAIL_OFFSET(eh));
69 return cpu_to_le32(csum);
70}
71
72static int ext4_extent_block_csum_verify(struct inode *inode,
73 struct ext4_extent_header *eh)
74{
75 struct ext4_extent_tail *et;
76
77 if (!EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb,
78 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
79 return 1;
80
81 et = find_ext4_extent_tail(eh);
82 if (et->et_checksum != ext4_extent_block_csum(inode, eh))
83 return 0;
84 return 1;
85}
86
87static void ext4_extent_block_csum_set(struct inode *inode,
88 struct ext4_extent_header *eh)
89{
90 struct ext4_extent_tail *et;
91
92 if (!EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb,
93 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
94 return;
95
96 et = find_ext4_extent_tail(eh);
97 et->et_checksum = ext4_extent_block_csum(inode, eh);
98}
99
Allison Hendersond583fb82011-05-25 07:41:43 -0400100static int ext4_split_extent(handle_t *handle,
101 struct inode *inode,
102 struct ext4_ext_path *path,
103 struct ext4_map_blocks *map,
104 int split_flag,
105 int flags);
106
Lukas Czerner5f95d212012-03-19 23:03:19 -0400107static int ext4_split_extent_at(handle_t *handle,
108 struct inode *inode,
109 struct ext4_ext_path *path,
110 ext4_lblk_t split,
111 int split_flag,
112 int flags);
113
Lukas Czerner91dd8c12012-11-28 12:32:26 -0500114static int ext4_find_delayed_extent(struct inode *inode,
Zheng Liu69eb33d2013-02-18 00:31:07 -0500115 struct extent_status *newes);
Lukas Czerner91dd8c12012-11-28 12:32:26 -0500116
Jan Kara487caee2009-08-17 22:17:20 -0400117static int ext4_ext_truncate_extend_restart(handle_t *handle,
118 struct inode *inode,
119 int needed)
Alex Tomasa86c6182006-10-11 01:21:03 -0700120{
121 int err;
122
Frank Mayhar03901312009-01-07 00:06:22 -0500123 if (!ext4_handle_valid(handle))
124 return 0;
Alex Tomasa86c6182006-10-11 01:21:03 -0700125 if (handle->h_buffer_credits > needed)
Shen Feng9102e4f2008-07-11 19:27:31 -0400126 return 0;
127 err = ext4_journal_extend(handle, needed);
Theodore Ts'o0123c932008-08-01 20:57:54 -0400128 if (err <= 0)
Shen Feng9102e4f2008-07-11 19:27:31 -0400129 return err;
Jan Kara487caee2009-08-17 22:17:20 -0400130 err = ext4_truncate_restart_trans(handle, inode, needed);
Dmitry Monakhov0617b832010-05-17 01:00:00 -0400131 if (err == 0)
132 err = -EAGAIN;
Jan Kara487caee2009-08-17 22:17:20 -0400133
134 return err;
Alex Tomasa86c6182006-10-11 01:21:03 -0700135}
136
137/*
138 * could return:
139 * - EROFS
140 * - ENOMEM
141 */
142static int ext4_ext_get_access(handle_t *handle, struct inode *inode,
143 struct ext4_ext_path *path)
144{
145 if (path->p_bh) {
146 /* path points to block */
147 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);
Theodore Ts'oe84a26c2009-04-22 20:52:25 -0400363
Theodore Ts'o31d4f3a2012-03-11 23:30:16 -0400364 if (len == 0)
365 return 0;
Theodore Ts'o6fd058f2009-05-17 15:38:01 -0400366 return ext4_data_block_valid(EXT4_SB(inode->i_sb), block, len);
Aneesh Kumar K.V56b19862009-03-12 09:51:20 -0400367}
368
369static int ext4_valid_extent_idx(struct inode *inode,
370 struct ext4_extent_idx *ext_idx)
371{
Theodore Ts'obf89d162010-10-27 21:30:14 -0400372 ext4_fsblk_t block = ext4_idx_pblock(ext_idx);
Theodore Ts'oe84a26c2009-04-22 20:52:25 -0400373
Theodore Ts'o6fd058f2009-05-17 15:38:01 -0400374 return ext4_data_block_valid(EXT4_SB(inode->i_sb), block, 1);
Aneesh Kumar K.V56b19862009-03-12 09:51:20 -0400375}
376
377static int ext4_valid_extent_entries(struct inode *inode,
378 struct ext4_extent_header *eh,
379 int depth)
380{
Aneesh Kumar K.V56b19862009-03-12 09:51:20 -0400381 unsigned short entries;
382 if (eh->eh_entries == 0)
383 return 1;
384
385 entries = le16_to_cpu(eh->eh_entries);
386
387 if (depth == 0) {
388 /* leaf entries */
Yongqiang Yang81fdbb42011-10-29 09:23:38 -0400389 struct ext4_extent *ext = EXT_FIRST_EXTENT(eh);
Aneesh Kumar K.V56b19862009-03-12 09:51:20 -0400390 while (entries) {
391 if (!ext4_valid_extent(inode, ext))
392 return 0;
393 ext++;
394 entries--;
395 }
396 } else {
Yongqiang Yang81fdbb42011-10-29 09:23:38 -0400397 struct ext4_extent_idx *ext_idx = EXT_FIRST_INDEX(eh);
Aneesh Kumar K.V56b19862009-03-12 09:51:20 -0400398 while (entries) {
399 if (!ext4_valid_extent_idx(inode, ext_idx))
400 return 0;
401 ext_idx++;
402 entries--;
403 }
404 }
405 return 1;
406}
407
Theodore Ts'oc398eda2010-07-27 11:56:40 -0400408static int __ext4_ext_check(const char *function, unsigned int line,
409 struct inode *inode, struct ext4_extent_header *eh,
Theodore Ts'oc3491792013-08-16 21:21:41 -0400410 int depth, ext4_fsblk_t pblk)
Alex Tomasc29c0ae2007-07-18 09:19:09 -0400411{
412 const char *error_msg;
413 int max = 0;
414
415 if (unlikely(eh->eh_magic != EXT4_EXT_MAGIC)) {
416 error_msg = "invalid magic";
417 goto corrupted;
418 }
419 if (unlikely(le16_to_cpu(eh->eh_depth) != depth)) {
420 error_msg = "unexpected eh_depth";
421 goto corrupted;
422 }
423 if (unlikely(eh->eh_max == 0)) {
424 error_msg = "invalid eh_max";
425 goto corrupted;
426 }
427 max = ext4_ext_max_entries(inode, depth);
428 if (unlikely(le16_to_cpu(eh->eh_max) > max)) {
429 error_msg = "too large eh_max";
430 goto corrupted;
431 }
432 if (unlikely(le16_to_cpu(eh->eh_entries) > le16_to_cpu(eh->eh_max))) {
433 error_msg = "invalid eh_entries";
434 goto corrupted;
435 }
Aneesh Kumar K.V56b19862009-03-12 09:51:20 -0400436 if (!ext4_valid_extent_entries(inode, eh, depth)) {
437 error_msg = "invalid extent entries";
438 goto corrupted;
439 }
Darrick J. Wong7ac59902012-04-29 18:37:10 -0400440 /* Verify checksum on non-root extent tree nodes */
441 if (ext_depth(inode) != depth &&
442 !ext4_extent_block_csum_verify(inode, eh)) {
443 error_msg = "extent tree corrupted";
444 goto corrupted;
445 }
Alex Tomasc29c0ae2007-07-18 09:19:09 -0400446 return 0;
447
448corrupted:
Theodore Ts'oc398eda2010-07-27 11:56:40 -0400449 ext4_error_inode(inode, function, line, 0,
Theodore Ts'oc3491792013-08-16 21:21:41 -0400450 "pblk %llu bad header/extent: %s - magic %x, "
451 "entries %u, max %u(%u), depth %u(%u)",
452 (unsigned long long) pblk, error_msg,
453 le16_to_cpu(eh->eh_magic),
454 le16_to_cpu(eh->eh_entries), le16_to_cpu(eh->eh_max),
455 max, le16_to_cpu(eh->eh_depth), depth);
Alex Tomasc29c0ae2007-07-18 09:19:09 -0400456 return -EIO;
457}
458
Theodore Ts'oc3491792013-08-16 21:21:41 -0400459#define ext4_ext_check(inode, eh, depth, pblk) \
460 __ext4_ext_check(__func__, __LINE__, (inode), (eh), (depth), (pblk))
Alex Tomasc29c0ae2007-07-18 09:19:09 -0400461
Aneesh Kumar K.V7a262f72009-03-27 16:39:58 -0400462int ext4_ext_check_inode(struct inode *inode)
463{
Theodore Ts'oc3491792013-08-16 21:21:41 -0400464 return ext4_ext_check(inode, ext_inode_hdr(inode), ext_depth(inode), 0);
Aneesh Kumar K.V7a262f72009-03-27 16:39:58 -0400465}
466
Theodore Ts'o7d7ea892013-08-16 21:20:41 -0400467static struct buffer_head *
468__read_extent_tree_block(const char *function, unsigned int line,
Theodore Ts'o107a7bd2013-08-16 21:23:41 -0400469 struct inode *inode, ext4_fsblk_t pblk, int depth,
470 int flags)
Darrick J. Wongf8489122012-04-29 18:21:10 -0400471{
Theodore Ts'o7d7ea892013-08-16 21:20:41 -0400472 struct buffer_head *bh;
473 int err;
Darrick J. Wongf8489122012-04-29 18:21:10 -0400474
Theodore Ts'o7d7ea892013-08-16 21:20:41 -0400475 bh = sb_getblk(inode->i_sb, pblk);
476 if (unlikely(!bh))
477 return ERR_PTR(-ENOMEM);
478
479 if (!bh_uptodate_or_lock(bh)) {
480 trace_ext4_ext_load_extent(inode, pblk, _RET_IP_);
481 err = bh_submit_read(bh);
482 if (err < 0)
483 goto errout;
484 }
Theodore Ts'o7869a4a2013-08-16 22:05:14 -0400485 if (buffer_verified(bh) && !(flags & EXT4_EX_FORCE_CACHE))
Theodore Ts'o7d7ea892013-08-16 21:20:41 -0400486 return bh;
487 err = __ext4_ext_check(function, line, inode,
Theodore Ts'oc3491792013-08-16 21:21:41 -0400488 ext_block_hdr(bh), depth, pblk);
Theodore Ts'o7d7ea892013-08-16 21:20:41 -0400489 if (err)
490 goto errout;
Darrick J. Wongf8489122012-04-29 18:21:10 -0400491 set_buffer_verified(bh);
Theodore Ts'o107a7bd2013-08-16 21:23:41 -0400492 /*
493 * If this is a leaf block, cache all of its entries
494 */
495 if (!(flags & EXT4_EX_NOCACHE) && depth == 0) {
496 struct ext4_extent_header *eh = ext_block_hdr(bh);
497 struct ext4_extent *ex = EXT_FIRST_EXTENT(eh);
498 ext4_lblk_t prev = 0;
499 int i;
500
501 for (i = le16_to_cpu(eh->eh_entries); i > 0; i--, ex++) {
502 unsigned int status = EXTENT_STATUS_WRITTEN;
503 ext4_lblk_t lblk = le32_to_cpu(ex->ee_block);
504 int len = ext4_ext_get_actual_len(ex);
505
506 if (prev && (prev != lblk))
507 ext4_es_cache_extent(inode, prev,
508 lblk - prev, ~0,
509 EXTENT_STATUS_HOLE);
510
511 if (ext4_ext_is_uninitialized(ex))
512 status = EXTENT_STATUS_UNWRITTEN;
513 ext4_es_cache_extent(inode, lblk, len,
514 ext4_ext_pblock(ex), status);
515 prev = lblk + len;
516 }
517 }
Theodore Ts'o7d7ea892013-08-16 21:20:41 -0400518 return bh;
519errout:
520 put_bh(bh);
521 return ERR_PTR(err);
522
Darrick J. Wongf8489122012-04-29 18:21:10 -0400523}
524
Theodore Ts'o107a7bd2013-08-16 21:23:41 -0400525#define read_extent_tree_block(inode, pblk, depth, flags) \
526 __read_extent_tree_block(__func__, __LINE__, (inode), (pblk), \
527 (depth), (flags))
Darrick J. Wongf8489122012-04-29 18:21:10 -0400528
Theodore Ts'o7869a4a2013-08-16 22:05:14 -0400529/*
530 * This function is called to cache a file's extent information in the
531 * extent status tree
532 */
533int ext4_ext_precache(struct inode *inode)
534{
535 struct ext4_inode_info *ei = EXT4_I(inode);
536 struct ext4_ext_path *path = NULL;
537 struct buffer_head *bh;
538 int i = 0, depth, ret = 0;
539
540 if (!ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))
541 return 0; /* not an extent-mapped inode */
542
543 down_read(&ei->i_data_sem);
544 depth = ext_depth(inode);
545
546 path = kzalloc(sizeof(struct ext4_ext_path) * (depth + 1),
547 GFP_NOFS);
548 if (path == NULL) {
549 up_read(&ei->i_data_sem);
550 return -ENOMEM;
551 }
552
553 /* Don't cache anything if there are no external extent blocks */
554 if (depth == 0)
555 goto out;
556 path[0].p_hdr = ext_inode_hdr(inode);
557 ret = ext4_ext_check(inode, path[0].p_hdr, depth, 0);
558 if (ret)
559 goto out;
560 path[0].p_idx = EXT_FIRST_INDEX(path[0].p_hdr);
561 while (i >= 0) {
562 /*
563 * If this is a leaf block or we've reached the end of
564 * the index block, go up
565 */
566 if ((i == depth) ||
567 path[i].p_idx > EXT_LAST_INDEX(path[i].p_hdr)) {
568 brelse(path[i].p_bh);
569 path[i].p_bh = NULL;
570 i--;
571 continue;
572 }
573 bh = read_extent_tree_block(inode,
574 ext4_idx_pblock(path[i].p_idx++),
575 depth - i - 1,
576 EXT4_EX_FORCE_CACHE);
577 if (IS_ERR(bh)) {
578 ret = PTR_ERR(bh);
579 break;
580 }
581 i++;
582 path[i].p_bh = bh;
583 path[i].p_hdr = ext_block_hdr(bh);
584 path[i].p_idx = EXT_FIRST_INDEX(path[i].p_hdr);
585 }
586 ext4_set_inode_state(inode, EXT4_STATE_EXT_PRECACHED);
587out:
588 up_read(&ei->i_data_sem);
589 ext4_ext_drop_refs(path);
590 kfree(path);
591 return ret;
592}
593
Alex Tomasa86c6182006-10-11 01:21:03 -0700594#ifdef EXT_DEBUG
595static void ext4_ext_show_path(struct inode *inode, struct ext4_ext_path *path)
596{
597 int k, l = path->p_depth;
598
599 ext_debug("path:");
600 for (k = 0; k <= l; k++, path++) {
601 if (path->p_idx) {
Mingming Cao2ae02102006-10-11 01:21:11 -0700602 ext_debug(" %d->%llu", le32_to_cpu(path->p_idx->ei_block),
Theodore Ts'obf89d162010-10-27 21:30:14 -0400603 ext4_idx_pblock(path->p_idx));
Alex Tomasa86c6182006-10-11 01:21:03 -0700604 } else if (path->p_ext) {
Mingming553f9002009-09-18 13:34:55 -0400605 ext_debug(" %d:[%d]%d:%llu ",
Alex Tomasa86c6182006-10-11 01:21:03 -0700606 le32_to_cpu(path->p_ext->ee_block),
Mingming553f9002009-09-18 13:34:55 -0400607 ext4_ext_is_uninitialized(path->p_ext),
Amit Aroraa2df2a62007-07-17 21:42:41 -0400608 ext4_ext_get_actual_len(path->p_ext),
Theodore Ts'obf89d162010-10-27 21:30:14 -0400609 ext4_ext_pblock(path->p_ext));
Alex Tomasa86c6182006-10-11 01:21:03 -0700610 } else
611 ext_debug(" []");
612 }
613 ext_debug("\n");
614}
615
616static void ext4_ext_show_leaf(struct inode *inode, struct ext4_ext_path *path)
617{
618 int depth = ext_depth(inode);
619 struct ext4_extent_header *eh;
620 struct ext4_extent *ex;
621 int i;
622
623 if (!path)
624 return;
625
626 eh = path[depth].p_hdr;
627 ex = EXT_FIRST_EXTENT(eh);
628
Mingming553f9002009-09-18 13:34:55 -0400629 ext_debug("Displaying leaf extents for inode %lu\n", inode->i_ino);
630
Alex Tomasa86c6182006-10-11 01:21:03 -0700631 for (i = 0; i < le16_to_cpu(eh->eh_entries); i++, ex++) {
Mingming553f9002009-09-18 13:34:55 -0400632 ext_debug("%d:[%d]%d:%llu ", le32_to_cpu(ex->ee_block),
633 ext4_ext_is_uninitialized(ex),
Theodore Ts'obf89d162010-10-27 21:30:14 -0400634 ext4_ext_get_actual_len(ex), ext4_ext_pblock(ex));
Alex Tomasa86c6182006-10-11 01:21:03 -0700635 }
636 ext_debug("\n");
637}
Yongqiang Yang1b16da72011-05-25 17:41:48 -0400638
639static void ext4_ext_show_move(struct inode *inode, struct ext4_ext_path *path,
640 ext4_fsblk_t newblock, int level)
641{
642 int depth = ext_depth(inode);
643 struct ext4_extent *ex;
644
645 if (depth != level) {
646 struct ext4_extent_idx *idx;
647 idx = path[level].p_idx;
648 while (idx <= EXT_MAX_INDEX(path[level].p_hdr)) {
649 ext_debug("%d: move %d:%llu in new index %llu\n", level,
650 le32_to_cpu(idx->ei_block),
651 ext4_idx_pblock(idx),
652 newblock);
653 idx++;
654 }
655
656 return;
657 }
658
659 ex = path[depth].p_ext;
660 while (ex <= EXT_MAX_EXTENT(path[depth].p_hdr)) {
661 ext_debug("move %d:%llu:[%d]%d in new leaf %llu\n",
662 le32_to_cpu(ex->ee_block),
663 ext4_ext_pblock(ex),
664 ext4_ext_is_uninitialized(ex),
665 ext4_ext_get_actual_len(ex),
666 newblock);
667 ex++;
668 }
669}
670
Alex Tomasa86c6182006-10-11 01:21:03 -0700671#else
Theodore Ts'oaf5bc922008-09-08 22:25:24 -0400672#define ext4_ext_show_path(inode, path)
673#define ext4_ext_show_leaf(inode, path)
Yongqiang Yang1b16da72011-05-25 17:41:48 -0400674#define ext4_ext_show_move(inode, path, newblock, level)
Alex Tomasa86c6182006-10-11 01:21:03 -0700675#endif
676
Aneesh Kumar K.Vb35905c2008-02-25 16:54:37 -0500677void ext4_ext_drop_refs(struct ext4_ext_path *path)
Alex Tomasa86c6182006-10-11 01:21:03 -0700678{
679 int depth = path->p_depth;
680 int i;
681
682 for (i = 0; i <= depth; i++, path++)
683 if (path->p_bh) {
684 brelse(path->p_bh);
685 path->p_bh = NULL;
686 }
687}
688
689/*
Randy Dunlapd0d856e2006-10-11 01:21:07 -0700690 * ext4_ext_binsearch_idx:
691 * binary search for the closest index of the given block
Alex Tomasc29c0ae2007-07-18 09:19:09 -0400692 * the header must be checked before calling this
Alex Tomasa86c6182006-10-11 01:21:03 -0700693 */
694static void
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -0500695ext4_ext_binsearch_idx(struct inode *inode,
696 struct ext4_ext_path *path, ext4_lblk_t block)
Alex Tomasa86c6182006-10-11 01:21:03 -0700697{
698 struct ext4_extent_header *eh = path->p_hdr;
699 struct ext4_extent_idx *r, *l, *m;
700
Alex Tomasa86c6182006-10-11 01:21:03 -0700701
Eric Sandeenbba90742008-01-28 23:58:27 -0500702 ext_debug("binsearch for %u(idx): ", block);
Alex Tomasa86c6182006-10-11 01:21:03 -0700703
704 l = EXT_FIRST_INDEX(eh) + 1;
Dmitry Monakhove9f410b2007-07-18 09:09:15 -0400705 r = EXT_LAST_INDEX(eh);
Alex Tomasa86c6182006-10-11 01:21:03 -0700706 while (l <= r) {
707 m = l + (r - l) / 2;
708 if (block < le32_to_cpu(m->ei_block))
709 r = m - 1;
710 else
711 l = m + 1;
Dmitry Monakhov26d535e2007-07-18 08:33:37 -0400712 ext_debug("%p(%u):%p(%u):%p(%u) ", l, le32_to_cpu(l->ei_block),
713 m, le32_to_cpu(m->ei_block),
714 r, le32_to_cpu(r->ei_block));
Alex Tomasa86c6182006-10-11 01:21:03 -0700715 }
716
717 path->p_idx = l - 1;
Zheng Liu4a3c3a52012-05-28 17:55:16 -0400718 ext_debug(" -> %u->%lld ", le32_to_cpu(path->p_idx->ei_block),
Theodore Ts'obf89d162010-10-27 21:30:14 -0400719 ext4_idx_pblock(path->p_idx));
Alex Tomasa86c6182006-10-11 01:21:03 -0700720
721#ifdef CHECK_BINSEARCH
722 {
723 struct ext4_extent_idx *chix, *ix;
724 int k;
725
726 chix = ix = EXT_FIRST_INDEX(eh);
727 for (k = 0; k < le16_to_cpu(eh->eh_entries); k++, ix++) {
728 if (k != 0 &&
729 le32_to_cpu(ix->ei_block) <= le32_to_cpu(ix[-1].ei_block)) {
Theodore Ts'o4776004f2008-09-08 23:00:52 -0400730 printk(KERN_DEBUG "k=%d, ix=0x%p, "
731 "first=0x%p\n", k,
732 ix, EXT_FIRST_INDEX(eh));
733 printk(KERN_DEBUG "%u <= %u\n",
Alex Tomasa86c6182006-10-11 01:21:03 -0700734 le32_to_cpu(ix->ei_block),
735 le32_to_cpu(ix[-1].ei_block));
736 }
737 BUG_ON(k && le32_to_cpu(ix->ei_block)
Dave Kleikamp8c55e202007-05-24 13:04:54 -0400738 <= le32_to_cpu(ix[-1].ei_block));
Alex Tomasa86c6182006-10-11 01:21:03 -0700739 if (block < le32_to_cpu(ix->ei_block))
740 break;
741 chix = ix;
742 }
743 BUG_ON(chix != path->p_idx);
744 }
745#endif
746
747}
748
749/*
Randy Dunlapd0d856e2006-10-11 01:21:07 -0700750 * ext4_ext_binsearch:
751 * binary search for closest extent of the given block
Alex Tomasc29c0ae2007-07-18 09:19:09 -0400752 * the header must be checked before calling this
Alex Tomasa86c6182006-10-11 01:21:03 -0700753 */
754static void
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -0500755ext4_ext_binsearch(struct inode *inode,
756 struct ext4_ext_path *path, ext4_lblk_t block)
Alex Tomasa86c6182006-10-11 01:21:03 -0700757{
758 struct ext4_extent_header *eh = path->p_hdr;
759 struct ext4_extent *r, *l, *m;
760
Alex Tomasa86c6182006-10-11 01:21:03 -0700761 if (eh->eh_entries == 0) {
762 /*
Randy Dunlapd0d856e2006-10-11 01:21:07 -0700763 * this leaf is empty:
764 * we get such a leaf in split/add case
Alex Tomasa86c6182006-10-11 01:21:03 -0700765 */
766 return;
767 }
768
Eric Sandeenbba90742008-01-28 23:58:27 -0500769 ext_debug("binsearch for %u: ", block);
Alex Tomasa86c6182006-10-11 01:21:03 -0700770
771 l = EXT_FIRST_EXTENT(eh) + 1;
Dmitry Monakhove9f410b2007-07-18 09:09:15 -0400772 r = EXT_LAST_EXTENT(eh);
Alex Tomasa86c6182006-10-11 01:21:03 -0700773
774 while (l <= r) {
775 m = l + (r - l) / 2;
776 if (block < le32_to_cpu(m->ee_block))
777 r = m - 1;
778 else
779 l = m + 1;
Dmitry Monakhov26d535e2007-07-18 08:33:37 -0400780 ext_debug("%p(%u):%p(%u):%p(%u) ", l, le32_to_cpu(l->ee_block),
781 m, le32_to_cpu(m->ee_block),
782 r, le32_to_cpu(r->ee_block));
Alex Tomasa86c6182006-10-11 01:21:03 -0700783 }
784
785 path->p_ext = l - 1;
Mingming553f9002009-09-18 13:34:55 -0400786 ext_debug(" -> %d:%llu:[%d]%d ",
Dave Kleikamp8c55e202007-05-24 13:04:54 -0400787 le32_to_cpu(path->p_ext->ee_block),
Theodore Ts'obf89d162010-10-27 21:30:14 -0400788 ext4_ext_pblock(path->p_ext),
Mingming553f9002009-09-18 13:34:55 -0400789 ext4_ext_is_uninitialized(path->p_ext),
Amit Aroraa2df2a62007-07-17 21:42:41 -0400790 ext4_ext_get_actual_len(path->p_ext));
Alex Tomasa86c6182006-10-11 01:21:03 -0700791
792#ifdef CHECK_BINSEARCH
793 {
794 struct ext4_extent *chex, *ex;
795 int k;
796
797 chex = ex = EXT_FIRST_EXTENT(eh);
798 for (k = 0; k < le16_to_cpu(eh->eh_entries); k++, ex++) {
799 BUG_ON(k && le32_to_cpu(ex->ee_block)
Dave Kleikamp8c55e202007-05-24 13:04:54 -0400800 <= le32_to_cpu(ex[-1].ee_block));
Alex Tomasa86c6182006-10-11 01:21:03 -0700801 if (block < le32_to_cpu(ex->ee_block))
802 break;
803 chex = ex;
804 }
805 BUG_ON(chex != path->p_ext);
806 }
807#endif
808
809}
810
811int ext4_ext_tree_init(handle_t *handle, struct inode *inode)
812{
813 struct ext4_extent_header *eh;
814
815 eh = ext_inode_hdr(inode);
816 eh->eh_depth = 0;
817 eh->eh_entries = 0;
818 eh->eh_magic = EXT4_EXT_MAGIC;
Theodore Ts'o55ad63b2009-08-28 10:40:33 -0400819 eh->eh_max = cpu_to_le16(ext4_ext_space_root(inode, 0));
Alex Tomasa86c6182006-10-11 01:21:03 -0700820 ext4_mark_inode_dirty(handle, inode);
Alex Tomasa86c6182006-10-11 01:21:03 -0700821 return 0;
822}
823
824struct ext4_ext_path *
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -0500825ext4_ext_find_extent(struct inode *inode, ext4_lblk_t block,
Theodore Ts'o107a7bd2013-08-16 21:23:41 -0400826 struct ext4_ext_path *path, int flags)
Alex Tomasa86c6182006-10-11 01:21:03 -0700827{
828 struct ext4_extent_header *eh;
829 struct buffer_head *bh;
830 short int depth, i, ppos = 0, alloc = 0;
Theodore Ts'o860d21e2013-01-12 16:19:36 -0500831 int ret;
Alex Tomasa86c6182006-10-11 01:21:03 -0700832
833 eh = ext_inode_hdr(inode);
Alex Tomasc29c0ae2007-07-18 09:19:09 -0400834 depth = ext_depth(inode);
Alex Tomasa86c6182006-10-11 01:21:03 -0700835
836 /* account possible depth increase */
837 if (!path) {
Avantika Mathur5d4958f2006-12-06 20:41:35 -0800838 path = kzalloc(sizeof(struct ext4_ext_path) * (depth + 2),
Alex Tomasa86c6182006-10-11 01:21:03 -0700839 GFP_NOFS);
840 if (!path)
841 return ERR_PTR(-ENOMEM);
842 alloc = 1;
843 }
Alex Tomasa86c6182006-10-11 01:21:03 -0700844 path[0].p_hdr = eh;
Shen Feng1973adc2008-07-11 19:27:31 -0400845 path[0].p_bh = NULL;
Alex Tomasa86c6182006-10-11 01:21:03 -0700846
Alex Tomasc29c0ae2007-07-18 09:19:09 -0400847 i = depth;
Alex Tomasa86c6182006-10-11 01:21:03 -0700848 /* walk through the tree */
849 while (i) {
850 ext_debug("depth %d: num %d, max %d\n",
851 ppos, le16_to_cpu(eh->eh_entries), le16_to_cpu(eh->eh_max));
Alex Tomasc29c0ae2007-07-18 09:19:09 -0400852
Alex Tomasa86c6182006-10-11 01:21:03 -0700853 ext4_ext_binsearch_idx(inode, path + ppos, block);
Theodore Ts'obf89d162010-10-27 21:30:14 -0400854 path[ppos].p_block = ext4_idx_pblock(path[ppos].p_idx);
Alex Tomasa86c6182006-10-11 01:21:03 -0700855 path[ppos].p_depth = i;
856 path[ppos].p_ext = NULL;
857
Theodore Ts'o107a7bd2013-08-16 21:23:41 -0400858 bh = read_extent_tree_block(inode, path[ppos].p_block, --i,
859 flags);
Theodore Ts'o7d7ea892013-08-16 21:20:41 -0400860 if (IS_ERR(bh)) {
861 ret = PTR_ERR(bh);
Alex Tomasa86c6182006-10-11 01:21:03 -0700862 goto err;
Theodore Ts'o860d21e2013-01-12 16:19:36 -0500863 }
Theodore Ts'o7d7ea892013-08-16 21:20:41 -0400864
Alex Tomasa86c6182006-10-11 01:21:03 -0700865 eh = ext_block_hdr(bh);
866 ppos++;
Frank Mayhar273df552010-03-02 11:46:09 -0500867 if (unlikely(ppos > depth)) {
868 put_bh(bh);
869 EXT4_ERROR_INODE(inode,
870 "ppos %d > depth %d", ppos, depth);
Theodore Ts'o860d21e2013-01-12 16:19:36 -0500871 ret = -EIO;
Frank Mayhar273df552010-03-02 11:46:09 -0500872 goto err;
873 }
Alex Tomasa86c6182006-10-11 01:21:03 -0700874 path[ppos].p_bh = bh;
875 path[ppos].p_hdr = eh;
Alex Tomasa86c6182006-10-11 01:21:03 -0700876 }
877
878 path[ppos].p_depth = i;
Alex Tomasa86c6182006-10-11 01:21:03 -0700879 path[ppos].p_ext = NULL;
880 path[ppos].p_idx = NULL;
881
Alex Tomasa86c6182006-10-11 01:21:03 -0700882 /* find extent */
883 ext4_ext_binsearch(inode, path + ppos, block);
Shen Feng1973adc2008-07-11 19:27:31 -0400884 /* if not an empty leaf */
885 if (path[ppos].p_ext)
Theodore Ts'obf89d162010-10-27 21:30:14 -0400886 path[ppos].p_block = ext4_ext_pblock(path[ppos].p_ext);
Alex Tomasa86c6182006-10-11 01:21:03 -0700887
888 ext4_ext_show_path(inode, path);
889
890 return path;
891
892err:
893 ext4_ext_drop_refs(path);
894 if (alloc)
895 kfree(path);
Theodore Ts'o860d21e2013-01-12 16:19:36 -0500896 return ERR_PTR(ret);
Alex Tomasa86c6182006-10-11 01:21:03 -0700897}
898
899/*
Randy Dunlapd0d856e2006-10-11 01:21:07 -0700900 * ext4_ext_insert_index:
901 * insert new index [@logical;@ptr] into the block at @curp;
902 * check where to insert: before @curp or after @curp
Alex Tomasa86c6182006-10-11 01:21:03 -0700903 */
Theodore Ts'o1f109d52010-10-27 21:30:14 -0400904static int ext4_ext_insert_index(handle_t *handle, struct inode *inode,
905 struct ext4_ext_path *curp,
906 int logical, ext4_fsblk_t ptr)
Alex Tomasa86c6182006-10-11 01:21:03 -0700907{
908 struct ext4_extent_idx *ix;
909 int len, err;
910
Avantika Mathur7e028972006-12-06 20:41:33 -0800911 err = ext4_ext_get_access(handle, inode, curp);
912 if (err)
Alex Tomasa86c6182006-10-11 01:21:03 -0700913 return err;
914
Frank Mayhar273df552010-03-02 11:46:09 -0500915 if (unlikely(logical == le32_to_cpu(curp->p_idx->ei_block))) {
916 EXT4_ERROR_INODE(inode,
917 "logical %d == ei_block %d!",
918 logical, le32_to_cpu(curp->p_idx->ei_block));
919 return -EIO;
920 }
Robin Dongd4620312011-07-17 23:43:42 -0400921
922 if (unlikely(le16_to_cpu(curp->p_hdr->eh_entries)
923 >= le16_to_cpu(curp->p_hdr->eh_max))) {
924 EXT4_ERROR_INODE(inode,
925 "eh_entries %d >= eh_max %d!",
926 le16_to_cpu(curp->p_hdr->eh_entries),
927 le16_to_cpu(curp->p_hdr->eh_max));
928 return -EIO;
929 }
930
Alex Tomasa86c6182006-10-11 01:21:03 -0700931 if (logical > le32_to_cpu(curp->p_idx->ei_block)) {
932 /* insert after */
Eric Gouriou80e675f2011-10-27 11:52:18 -0400933 ext_debug("insert new index %d after: %llu\n", logical, ptr);
Alex Tomasa86c6182006-10-11 01:21:03 -0700934 ix = curp->p_idx + 1;
935 } else {
936 /* insert before */
Eric Gouriou80e675f2011-10-27 11:52:18 -0400937 ext_debug("insert new index %d before: %llu\n", logical, ptr);
Alex Tomasa86c6182006-10-11 01:21:03 -0700938 ix = curp->p_idx;
939 }
940
Eric Gouriou80e675f2011-10-27 11:52:18 -0400941 len = EXT_LAST_INDEX(curp->p_hdr) - ix + 1;
942 BUG_ON(len < 0);
943 if (len > 0) {
944 ext_debug("insert new index %d: "
945 "move %d indices from 0x%p to 0x%p\n",
946 logical, len, ix, ix + 1);
947 memmove(ix + 1, ix, len * sizeof(struct ext4_extent_idx));
948 }
949
Tao Maf472e022011-10-17 10:13:46 -0400950 if (unlikely(ix > EXT_MAX_INDEX(curp->p_hdr))) {
951 EXT4_ERROR_INODE(inode, "ix > EXT_MAX_INDEX!");
952 return -EIO;
953 }
954
Alex Tomasa86c6182006-10-11 01:21:03 -0700955 ix->ei_block = cpu_to_le32(logical);
Alex Tomasf65e6fb2006-10-11 01:21:05 -0700956 ext4_idx_store_pblock(ix, ptr);
Marcin Slusarze8546d02008-04-17 10:38:59 -0400957 le16_add_cpu(&curp->p_hdr->eh_entries, 1);
Alex Tomasa86c6182006-10-11 01:21:03 -0700958
Frank Mayhar273df552010-03-02 11:46:09 -0500959 if (unlikely(ix > EXT_LAST_INDEX(curp->p_hdr))) {
960 EXT4_ERROR_INODE(inode, "ix > EXT_LAST_INDEX!");
961 return -EIO;
962 }
Alex Tomasa86c6182006-10-11 01:21:03 -0700963
964 err = ext4_ext_dirty(handle, inode, curp);
965 ext4_std_error(inode->i_sb, err);
966
967 return err;
968}
969
970/*
Randy Dunlapd0d856e2006-10-11 01:21:07 -0700971 * ext4_ext_split:
972 * inserts new subtree into the path, using free index entry
973 * at depth @at:
974 * - allocates all needed blocks (new leaf and all intermediate index blocks)
975 * - makes decision where to split
976 * - moves remaining extents and index entries (right to the split point)
977 * into the newly allocated blocks
978 * - initializes subtree
Alex Tomasa86c6182006-10-11 01:21:03 -0700979 */
980static int ext4_ext_split(handle_t *handle, struct inode *inode,
Allison Henderson55f020d2011-05-25 07:41:26 -0400981 unsigned int flags,
982 struct ext4_ext_path *path,
983 struct ext4_extent *newext, int at)
Alex Tomasa86c6182006-10-11 01:21:03 -0700984{
985 struct buffer_head *bh = NULL;
986 int depth = ext_depth(inode);
987 struct ext4_extent_header *neh;
988 struct ext4_extent_idx *fidx;
Alex Tomasa86c6182006-10-11 01:21:03 -0700989 int i = at, k, m, a;
Alex Tomasf65e6fb2006-10-11 01:21:05 -0700990 ext4_fsblk_t newblock, oldblock;
Alex Tomasa86c6182006-10-11 01:21:03 -0700991 __le32 border;
Alex Tomasf65e6fb2006-10-11 01:21:05 -0700992 ext4_fsblk_t *ablocks = NULL; /* array of allocated blocks */
Alex Tomasa86c6182006-10-11 01:21:03 -0700993 int err = 0;
994
995 /* make decision: where to split? */
Randy Dunlapd0d856e2006-10-11 01:21:07 -0700996 /* FIXME: now decision is simplest: at current extent */
Alex Tomasa86c6182006-10-11 01:21:03 -0700997
Randy Dunlapd0d856e2006-10-11 01:21:07 -0700998 /* if current leaf will be split, then we should use
Alex Tomasa86c6182006-10-11 01:21:03 -0700999 * border from split point */
Frank Mayhar273df552010-03-02 11:46:09 -05001000 if (unlikely(path[depth].p_ext > EXT_MAX_EXTENT(path[depth].p_hdr))) {
1001 EXT4_ERROR_INODE(inode, "p_ext > EXT_MAX_EXTENT!");
1002 return -EIO;
1003 }
Alex Tomasa86c6182006-10-11 01:21:03 -07001004 if (path[depth].p_ext != EXT_MAX_EXTENT(path[depth].p_hdr)) {
1005 border = path[depth].p_ext[1].ee_block;
Randy Dunlapd0d856e2006-10-11 01:21:07 -07001006 ext_debug("leaf will be split."
Alex Tomasa86c6182006-10-11 01:21:03 -07001007 " next leaf starts at %d\n",
Dave Kleikamp8c55e202007-05-24 13:04:54 -04001008 le32_to_cpu(border));
Alex Tomasa86c6182006-10-11 01:21:03 -07001009 } else {
1010 border = newext->ee_block;
1011 ext_debug("leaf will be added."
1012 " next leaf starts at %d\n",
Dave Kleikamp8c55e202007-05-24 13:04:54 -04001013 le32_to_cpu(border));
Alex Tomasa86c6182006-10-11 01:21:03 -07001014 }
1015
1016 /*
Randy Dunlapd0d856e2006-10-11 01:21:07 -07001017 * If error occurs, then we break processing
1018 * and mark filesystem read-only. index won't
Alex Tomasa86c6182006-10-11 01:21:03 -07001019 * be inserted and tree will be in consistent
Randy Dunlapd0d856e2006-10-11 01:21:07 -07001020 * state. Next mount will repair buffers too.
Alex Tomasa86c6182006-10-11 01:21:03 -07001021 */
1022
1023 /*
Randy Dunlapd0d856e2006-10-11 01:21:07 -07001024 * Get array to track all allocated blocks.
1025 * We need this to handle errors and free blocks
1026 * upon them.
Alex Tomasa86c6182006-10-11 01:21:03 -07001027 */
Avantika Mathur5d4958f2006-12-06 20:41:35 -08001028 ablocks = kzalloc(sizeof(ext4_fsblk_t) * depth, GFP_NOFS);
Alex Tomasa86c6182006-10-11 01:21:03 -07001029 if (!ablocks)
1030 return -ENOMEM;
Alex Tomasa86c6182006-10-11 01:21:03 -07001031
1032 /* allocate all needed blocks */
1033 ext_debug("allocate %d blocks for indexes/leaf\n", depth - at);
1034 for (a = 0; a < depth - at; a++) {
Aneesh Kumar K.V654b4902008-07-11 19:27:31 -04001035 newblock = ext4_ext_new_meta_block(handle, inode, path,
Allison Henderson55f020d2011-05-25 07:41:26 -04001036 newext, &err, flags);
Alex Tomasa86c6182006-10-11 01:21:03 -07001037 if (newblock == 0)
1038 goto cleanup;
1039 ablocks[a] = newblock;
1040 }
1041
1042 /* initialize new leaf */
1043 newblock = ablocks[--a];
Frank Mayhar273df552010-03-02 11:46:09 -05001044 if (unlikely(newblock == 0)) {
1045 EXT4_ERROR_INODE(inode, "newblock == 0!");
1046 err = -EIO;
1047 goto cleanup;
1048 }
Alex Tomasa86c6182006-10-11 01:21:03 -07001049 bh = sb_getblk(inode->i_sb, newblock);
Wang Shilongaebf0242013-01-12 16:28:47 -05001050 if (unlikely(!bh)) {
Theodore Ts'o860d21e2013-01-12 16:19:36 -05001051 err = -ENOMEM;
Alex Tomasa86c6182006-10-11 01:21:03 -07001052 goto cleanup;
1053 }
1054 lock_buffer(bh);
1055
Avantika Mathur7e028972006-12-06 20:41:33 -08001056 err = ext4_journal_get_create_access(handle, bh);
1057 if (err)
Alex Tomasa86c6182006-10-11 01:21:03 -07001058 goto cleanup;
1059
1060 neh = ext_block_hdr(bh);
1061 neh->eh_entries = 0;
Theodore Ts'o55ad63b2009-08-28 10:40:33 -04001062 neh->eh_max = cpu_to_le16(ext4_ext_space_block(inode, 0));
Alex Tomasa86c6182006-10-11 01:21:03 -07001063 neh->eh_magic = EXT4_EXT_MAGIC;
1064 neh->eh_depth = 0;
Alex Tomasa86c6182006-10-11 01:21:03 -07001065
Randy Dunlapd0d856e2006-10-11 01:21:07 -07001066 /* move remainder of path[depth] to the new leaf */
Frank Mayhar273df552010-03-02 11:46:09 -05001067 if (unlikely(path[depth].p_hdr->eh_entries !=
1068 path[depth].p_hdr->eh_max)) {
1069 EXT4_ERROR_INODE(inode, "eh_entries %d != eh_max %d!",
1070 path[depth].p_hdr->eh_entries,
1071 path[depth].p_hdr->eh_max);
1072 err = -EIO;
1073 goto cleanup;
1074 }
Alex Tomasa86c6182006-10-11 01:21:03 -07001075 /* start copy from next extent */
Yongqiang Yang1b16da72011-05-25 17:41:48 -04001076 m = EXT_MAX_EXTENT(path[depth].p_hdr) - path[depth].p_ext++;
1077 ext4_ext_show_move(inode, path, newblock, depth);
Alex Tomasa86c6182006-10-11 01:21:03 -07001078 if (m) {
Yongqiang Yang1b16da72011-05-25 17:41:48 -04001079 struct ext4_extent *ex;
1080 ex = EXT_FIRST_EXTENT(neh);
1081 memmove(ex, path[depth].p_ext, sizeof(struct ext4_extent) * m);
Marcin Slusarze8546d02008-04-17 10:38:59 -04001082 le16_add_cpu(&neh->eh_entries, m);
Alex Tomasa86c6182006-10-11 01:21:03 -07001083 }
1084
Darrick J. Wong7ac59902012-04-29 18:37:10 -04001085 ext4_extent_block_csum_set(inode, neh);
Alex Tomasa86c6182006-10-11 01:21:03 -07001086 set_buffer_uptodate(bh);
1087 unlock_buffer(bh);
1088
Frank Mayhar03901312009-01-07 00:06:22 -05001089 err = ext4_handle_dirty_metadata(handle, inode, bh);
Avantika Mathur7e028972006-12-06 20:41:33 -08001090 if (err)
Alex Tomasa86c6182006-10-11 01:21:03 -07001091 goto cleanup;
1092 brelse(bh);
1093 bh = NULL;
1094
1095 /* correct old leaf */
1096 if (m) {
Avantika Mathur7e028972006-12-06 20:41:33 -08001097 err = ext4_ext_get_access(handle, inode, path + depth);
1098 if (err)
Alex Tomasa86c6182006-10-11 01:21:03 -07001099 goto cleanup;
Marcin Slusarze8546d02008-04-17 10:38:59 -04001100 le16_add_cpu(&path[depth].p_hdr->eh_entries, -m);
Avantika Mathur7e028972006-12-06 20:41:33 -08001101 err = ext4_ext_dirty(handle, inode, path + depth);
1102 if (err)
Alex Tomasa86c6182006-10-11 01:21:03 -07001103 goto cleanup;
1104
1105 }
1106
1107 /* create intermediate indexes */
1108 k = depth - at - 1;
Frank Mayhar273df552010-03-02 11:46:09 -05001109 if (unlikely(k < 0)) {
1110 EXT4_ERROR_INODE(inode, "k %d < 0!", k);
1111 err = -EIO;
1112 goto cleanup;
1113 }
Alex Tomasa86c6182006-10-11 01:21:03 -07001114 if (k)
1115 ext_debug("create %d intermediate indices\n", k);
1116 /* insert new index into current index block */
1117 /* current depth stored in i var */
1118 i = depth - 1;
1119 while (k--) {
1120 oldblock = newblock;
1121 newblock = ablocks[--a];
Eric Sandeenbba90742008-01-28 23:58:27 -05001122 bh = sb_getblk(inode->i_sb, newblock);
Wang Shilongaebf0242013-01-12 16:28:47 -05001123 if (unlikely(!bh)) {
Theodore Ts'o860d21e2013-01-12 16:19:36 -05001124 err = -ENOMEM;
Alex Tomasa86c6182006-10-11 01:21:03 -07001125 goto cleanup;
1126 }
1127 lock_buffer(bh);
1128
Avantika Mathur7e028972006-12-06 20:41:33 -08001129 err = ext4_journal_get_create_access(handle, bh);
1130 if (err)
Alex Tomasa86c6182006-10-11 01:21:03 -07001131 goto cleanup;
1132
1133 neh = ext_block_hdr(bh);
1134 neh->eh_entries = cpu_to_le16(1);
1135 neh->eh_magic = EXT4_EXT_MAGIC;
Theodore Ts'o55ad63b2009-08-28 10:40:33 -04001136 neh->eh_max = cpu_to_le16(ext4_ext_space_block_idx(inode, 0));
Alex Tomasa86c6182006-10-11 01:21:03 -07001137 neh->eh_depth = cpu_to_le16(depth - i);
1138 fidx = EXT_FIRST_INDEX(neh);
1139 fidx->ei_block = border;
Alex Tomasf65e6fb2006-10-11 01:21:05 -07001140 ext4_idx_store_pblock(fidx, oldblock);
Alex Tomasa86c6182006-10-11 01:21:03 -07001141
Eric Sandeenbba90742008-01-28 23:58:27 -05001142 ext_debug("int.index at %d (block %llu): %u -> %llu\n",
1143 i, newblock, le32_to_cpu(border), oldblock);
Alex Tomasa86c6182006-10-11 01:21:03 -07001144
Yongqiang Yang1b16da72011-05-25 17:41:48 -04001145 /* move remainder of path[i] to the new index block */
Frank Mayhar273df552010-03-02 11:46:09 -05001146 if (unlikely(EXT_MAX_INDEX(path[i].p_hdr) !=
1147 EXT_LAST_INDEX(path[i].p_hdr))) {
1148 EXT4_ERROR_INODE(inode,
1149 "EXT_MAX_INDEX != EXT_LAST_INDEX ee_block %d!",
1150 le32_to_cpu(path[i].p_ext->ee_block));
1151 err = -EIO;
1152 goto cleanup;
1153 }
Yongqiang Yang1b16da72011-05-25 17:41:48 -04001154 /* start copy indexes */
1155 m = EXT_MAX_INDEX(path[i].p_hdr) - path[i].p_idx++;
1156 ext_debug("cur 0x%p, last 0x%p\n", path[i].p_idx,
1157 EXT_MAX_INDEX(path[i].p_hdr));
1158 ext4_ext_show_move(inode, path, newblock, i);
Alex Tomasa86c6182006-10-11 01:21:03 -07001159 if (m) {
Yongqiang Yang1b16da72011-05-25 17:41:48 -04001160 memmove(++fidx, path[i].p_idx,
Alex Tomasa86c6182006-10-11 01:21:03 -07001161 sizeof(struct ext4_extent_idx) * m);
Marcin Slusarze8546d02008-04-17 10:38:59 -04001162 le16_add_cpu(&neh->eh_entries, m);
Alex Tomasa86c6182006-10-11 01:21:03 -07001163 }
Darrick J. Wong7ac59902012-04-29 18:37:10 -04001164 ext4_extent_block_csum_set(inode, neh);
Alex Tomasa86c6182006-10-11 01:21:03 -07001165 set_buffer_uptodate(bh);
1166 unlock_buffer(bh);
1167
Frank Mayhar03901312009-01-07 00:06:22 -05001168 err = ext4_handle_dirty_metadata(handle, inode, bh);
Avantika Mathur7e028972006-12-06 20:41:33 -08001169 if (err)
Alex Tomasa86c6182006-10-11 01:21:03 -07001170 goto cleanup;
1171 brelse(bh);
1172 bh = NULL;
1173
1174 /* correct old index */
1175 if (m) {
1176 err = ext4_ext_get_access(handle, inode, path + i);
1177 if (err)
1178 goto cleanup;
Marcin Slusarze8546d02008-04-17 10:38:59 -04001179 le16_add_cpu(&path[i].p_hdr->eh_entries, -m);
Alex Tomasa86c6182006-10-11 01:21:03 -07001180 err = ext4_ext_dirty(handle, inode, path + i);
1181 if (err)
1182 goto cleanup;
1183 }
1184
1185 i--;
1186 }
1187
1188 /* insert new index */
Alex Tomasa86c6182006-10-11 01:21:03 -07001189 err = ext4_ext_insert_index(handle, inode, path + at,
1190 le32_to_cpu(border), newblock);
1191
1192cleanup:
1193 if (bh) {
1194 if (buffer_locked(bh))
1195 unlock_buffer(bh);
1196 brelse(bh);
1197 }
1198
1199 if (err) {
1200 /* free all allocated blocks in error case */
1201 for (i = 0; i < depth; i++) {
1202 if (!ablocks[i])
1203 continue;
Peter Huewe7dc57612011-02-21 21:01:42 -05001204 ext4_free_blocks(handle, inode, NULL, ablocks[i], 1,
Theodore Ts'oe6362602009-11-23 07:17:05 -05001205 EXT4_FREE_BLOCKS_METADATA);
Alex Tomasa86c6182006-10-11 01:21:03 -07001206 }
1207 }
1208 kfree(ablocks);
1209
1210 return err;
1211}
1212
1213/*
Randy Dunlapd0d856e2006-10-11 01:21:07 -07001214 * ext4_ext_grow_indepth:
1215 * implements tree growing procedure:
1216 * - allocates new block
1217 * - moves top-level data (index block or leaf) into the new block
1218 * - initializes new top-level, creating index that points to the
1219 * just created block
Alex Tomasa86c6182006-10-11 01:21:03 -07001220 */
1221static int ext4_ext_grow_indepth(handle_t *handle, struct inode *inode,
Allison Henderson55f020d2011-05-25 07:41:26 -04001222 unsigned int flags,
Allison Henderson55f020d2011-05-25 07:41:26 -04001223 struct ext4_extent *newext)
Alex Tomasa86c6182006-10-11 01:21:03 -07001224{
Alex Tomasa86c6182006-10-11 01:21:03 -07001225 struct ext4_extent_header *neh;
Alex Tomasa86c6182006-10-11 01:21:03 -07001226 struct buffer_head *bh;
Alex Tomasf65e6fb2006-10-11 01:21:05 -07001227 ext4_fsblk_t newblock;
Alex Tomasa86c6182006-10-11 01:21:03 -07001228 int err = 0;
1229
Dmitry Monakhov1939dd82011-10-22 01:26:05 -04001230 newblock = ext4_ext_new_meta_block(handle, inode, NULL,
Allison Henderson55f020d2011-05-25 07:41:26 -04001231 newext, &err, flags);
Alex Tomasa86c6182006-10-11 01:21:03 -07001232 if (newblock == 0)
1233 return err;
1234
1235 bh = sb_getblk(inode->i_sb, newblock);
Wang Shilongaebf0242013-01-12 16:28:47 -05001236 if (unlikely(!bh))
Theodore Ts'o860d21e2013-01-12 16:19:36 -05001237 return -ENOMEM;
Alex Tomasa86c6182006-10-11 01:21:03 -07001238 lock_buffer(bh);
1239
Avantika Mathur7e028972006-12-06 20:41:33 -08001240 err = ext4_journal_get_create_access(handle, bh);
1241 if (err) {
Alex Tomasa86c6182006-10-11 01:21:03 -07001242 unlock_buffer(bh);
1243 goto out;
1244 }
1245
1246 /* move top-level index/leaf into new block */
Dmitry Monakhov1939dd82011-10-22 01:26:05 -04001247 memmove(bh->b_data, EXT4_I(inode)->i_data,
1248 sizeof(EXT4_I(inode)->i_data));
Alex Tomasa86c6182006-10-11 01:21:03 -07001249
1250 /* set size of new block */
1251 neh = ext_block_hdr(bh);
1252 /* old root could have indexes or leaves
1253 * so calculate e_max right way */
1254 if (ext_depth(inode))
Theodore Ts'o55ad63b2009-08-28 10:40:33 -04001255 neh->eh_max = cpu_to_le16(ext4_ext_space_block_idx(inode, 0));
Alex Tomasa86c6182006-10-11 01:21:03 -07001256 else
Theodore Ts'o55ad63b2009-08-28 10:40:33 -04001257 neh->eh_max = cpu_to_le16(ext4_ext_space_block(inode, 0));
Alex Tomasa86c6182006-10-11 01:21:03 -07001258 neh->eh_magic = EXT4_EXT_MAGIC;
Darrick J. Wong7ac59902012-04-29 18:37:10 -04001259 ext4_extent_block_csum_set(inode, neh);
Alex Tomasa86c6182006-10-11 01:21:03 -07001260 set_buffer_uptodate(bh);
1261 unlock_buffer(bh);
1262
Frank Mayhar03901312009-01-07 00:06:22 -05001263 err = ext4_handle_dirty_metadata(handle, inode, bh);
Avantika Mathur7e028972006-12-06 20:41:33 -08001264 if (err)
Alex Tomasa86c6182006-10-11 01:21:03 -07001265 goto out;
1266
Dmitry Monakhov1939dd82011-10-22 01:26:05 -04001267 /* Update top-level index: num,max,pointer */
Alex Tomasa86c6182006-10-11 01:21:03 -07001268 neh = ext_inode_hdr(inode);
Dmitry Monakhov1939dd82011-10-22 01:26:05 -04001269 neh->eh_entries = cpu_to_le16(1);
1270 ext4_idx_store_pblock(EXT_FIRST_INDEX(neh), newblock);
1271 if (neh->eh_depth == 0) {
1272 /* Root extent block becomes index block */
1273 neh->eh_max = cpu_to_le16(ext4_ext_space_root_idx(inode, 0));
1274 EXT_FIRST_INDEX(neh)->ei_block =
1275 EXT_FIRST_EXTENT(neh)->ee_block;
1276 }
Mingming Cao2ae02102006-10-11 01:21:11 -07001277 ext_debug("new root: num %d(%d), lblock %d, ptr %llu\n",
Alex Tomasa86c6182006-10-11 01:21:03 -07001278 le16_to_cpu(neh->eh_entries), le16_to_cpu(neh->eh_max),
Andi Kleen5a0790c2010-06-14 13:28:03 -04001279 le32_to_cpu(EXT_FIRST_INDEX(neh)->ei_block),
Theodore Ts'obf89d162010-10-27 21:30:14 -04001280 ext4_idx_pblock(EXT_FIRST_INDEX(neh)));
Alex Tomasa86c6182006-10-11 01:21:03 -07001281
Wei Yongjunba39ebb2012-09-27 09:37:53 -04001282 le16_add_cpu(&neh->eh_depth, 1);
Dmitry Monakhov1939dd82011-10-22 01:26:05 -04001283 ext4_mark_inode_dirty(handle, inode);
Alex Tomasa86c6182006-10-11 01:21:03 -07001284out:
1285 brelse(bh);
1286
1287 return err;
1288}
1289
1290/*
Randy Dunlapd0d856e2006-10-11 01:21:07 -07001291 * ext4_ext_create_new_leaf:
1292 * finds empty index and adds new leaf.
1293 * if no free index is found, then it requests in-depth growing.
Alex Tomasa86c6182006-10-11 01:21:03 -07001294 */
1295static int ext4_ext_create_new_leaf(handle_t *handle, struct inode *inode,
Theodore Ts'o107a7bd2013-08-16 21:23:41 -04001296 unsigned int mb_flags,
1297 unsigned int gb_flags,
Allison Henderson55f020d2011-05-25 07:41:26 -04001298 struct ext4_ext_path *path,
1299 struct ext4_extent *newext)
Alex Tomasa86c6182006-10-11 01:21:03 -07001300{
1301 struct ext4_ext_path *curp;
1302 int depth, i, err = 0;
1303
1304repeat:
1305 i = depth = ext_depth(inode);
1306
1307 /* walk up to the tree and look for free index entry */
1308 curp = path + depth;
1309 while (i > 0 && !EXT_HAS_FREE_INDEX(curp)) {
1310 i--;
1311 curp--;
1312 }
1313
Randy Dunlapd0d856e2006-10-11 01:21:07 -07001314 /* we use already allocated block for index block,
1315 * so subsequent data blocks should be contiguous */
Alex Tomasa86c6182006-10-11 01:21:03 -07001316 if (EXT_HAS_FREE_INDEX(curp)) {
1317 /* if we found index with free entry, then use that
1318 * entry: create all needed subtree and add new leaf */
Theodore Ts'o107a7bd2013-08-16 21:23:41 -04001319 err = ext4_ext_split(handle, inode, mb_flags, path, newext, i);
Shen Feng787e0982008-07-11 19:27:31 -04001320 if (err)
1321 goto out;
Alex Tomasa86c6182006-10-11 01:21:03 -07001322
1323 /* refill path */
1324 ext4_ext_drop_refs(path);
1325 path = ext4_ext_find_extent(inode,
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05001326 (ext4_lblk_t)le32_to_cpu(newext->ee_block),
Theodore Ts'o107a7bd2013-08-16 21:23:41 -04001327 path, gb_flags);
Alex Tomasa86c6182006-10-11 01:21:03 -07001328 if (IS_ERR(path))
1329 err = PTR_ERR(path);
1330 } else {
1331 /* tree is full, time to grow in depth */
Theodore Ts'o107a7bd2013-08-16 21:23:41 -04001332 err = ext4_ext_grow_indepth(handle, inode, mb_flags, newext);
Alex Tomasa86c6182006-10-11 01:21:03 -07001333 if (err)
1334 goto out;
1335
1336 /* refill path */
1337 ext4_ext_drop_refs(path);
1338 path = ext4_ext_find_extent(inode,
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05001339 (ext4_lblk_t)le32_to_cpu(newext->ee_block),
Theodore Ts'o107a7bd2013-08-16 21:23:41 -04001340 path, gb_flags);
Alex Tomasa86c6182006-10-11 01:21:03 -07001341 if (IS_ERR(path)) {
1342 err = PTR_ERR(path);
1343 goto out;
1344 }
1345
1346 /*
Randy Dunlapd0d856e2006-10-11 01:21:07 -07001347 * only first (depth 0 -> 1) produces free space;
1348 * in all other cases we have to split the grown tree
Alex Tomasa86c6182006-10-11 01:21:03 -07001349 */
1350 depth = ext_depth(inode);
1351 if (path[depth].p_hdr->eh_entries == path[depth].p_hdr->eh_max) {
Randy Dunlapd0d856e2006-10-11 01:21:07 -07001352 /* now we need to split */
Alex Tomasa86c6182006-10-11 01:21:03 -07001353 goto repeat;
1354 }
1355 }
1356
1357out:
1358 return err;
1359}
1360
1361/*
Alex Tomas1988b512008-01-28 23:58:27 -05001362 * search the closest allocated block to the left for *logical
1363 * and returns it at @logical + it's physical address at @phys
1364 * if *logical is the smallest allocated block, the function
1365 * returns 0 at @phys
1366 * return value contains 0 (success) or error code
1367 */
Theodore Ts'o1f109d52010-10-27 21:30:14 -04001368static int ext4_ext_search_left(struct inode *inode,
1369 struct ext4_ext_path *path,
1370 ext4_lblk_t *logical, ext4_fsblk_t *phys)
Alex Tomas1988b512008-01-28 23:58:27 -05001371{
1372 struct ext4_extent_idx *ix;
1373 struct ext4_extent *ex;
Aneesh Kumar K.Vb939e372008-01-28 23:58:27 -05001374 int depth, ee_len;
Alex Tomas1988b512008-01-28 23:58:27 -05001375
Frank Mayhar273df552010-03-02 11:46:09 -05001376 if (unlikely(path == NULL)) {
1377 EXT4_ERROR_INODE(inode, "path == NULL *logical %d!", *logical);
1378 return -EIO;
1379 }
Alex Tomas1988b512008-01-28 23:58:27 -05001380 depth = path->p_depth;
1381 *phys = 0;
1382
1383 if (depth == 0 && path->p_ext == NULL)
1384 return 0;
1385
1386 /* usually extent in the path covers blocks smaller
1387 * then *logical, but it can be that extent is the
1388 * first one in the file */
1389
1390 ex = path[depth].p_ext;
Aneesh Kumar K.Vb939e372008-01-28 23:58:27 -05001391 ee_len = ext4_ext_get_actual_len(ex);
Alex Tomas1988b512008-01-28 23:58:27 -05001392 if (*logical < le32_to_cpu(ex->ee_block)) {
Frank Mayhar273df552010-03-02 11:46:09 -05001393 if (unlikely(EXT_FIRST_EXTENT(path[depth].p_hdr) != ex)) {
1394 EXT4_ERROR_INODE(inode,
1395 "EXT_FIRST_EXTENT != ex *logical %d ee_block %d!",
1396 *logical, le32_to_cpu(ex->ee_block));
1397 return -EIO;
1398 }
Alex Tomas1988b512008-01-28 23:58:27 -05001399 while (--depth >= 0) {
1400 ix = path[depth].p_idx;
Frank Mayhar273df552010-03-02 11:46:09 -05001401 if (unlikely(ix != EXT_FIRST_INDEX(path[depth].p_hdr))) {
1402 EXT4_ERROR_INODE(inode,
1403 "ix (%d) != EXT_FIRST_INDEX (%d) (depth %d)!",
Tao Ma6ee3b212011-10-08 16:08:34 -04001404 ix != NULL ? le32_to_cpu(ix->ei_block) : 0,
Frank Mayhar273df552010-03-02 11:46:09 -05001405 EXT_FIRST_INDEX(path[depth].p_hdr) != NULL ?
Tao Ma6ee3b212011-10-08 16:08:34 -04001406 le32_to_cpu(EXT_FIRST_INDEX(path[depth].p_hdr)->ei_block) : 0,
Frank Mayhar273df552010-03-02 11:46:09 -05001407 depth);
1408 return -EIO;
1409 }
Alex Tomas1988b512008-01-28 23:58:27 -05001410 }
1411 return 0;
1412 }
1413
Frank Mayhar273df552010-03-02 11:46:09 -05001414 if (unlikely(*logical < (le32_to_cpu(ex->ee_block) + ee_len))) {
1415 EXT4_ERROR_INODE(inode,
1416 "logical %d < ee_block %d + ee_len %d!",
1417 *logical, le32_to_cpu(ex->ee_block), ee_len);
1418 return -EIO;
1419 }
Alex Tomas1988b512008-01-28 23:58:27 -05001420
Aneesh Kumar K.Vb939e372008-01-28 23:58:27 -05001421 *logical = le32_to_cpu(ex->ee_block) + ee_len - 1;
Theodore Ts'obf89d162010-10-27 21:30:14 -04001422 *phys = ext4_ext_pblock(ex) + ee_len - 1;
Alex Tomas1988b512008-01-28 23:58:27 -05001423 return 0;
1424}
1425
1426/*
1427 * search the closest allocated block to the right for *logical
1428 * and returns it at @logical + it's physical address at @phys
Tao Madf3ab172011-10-08 15:53:49 -04001429 * if *logical is the largest allocated block, the function
Alex Tomas1988b512008-01-28 23:58:27 -05001430 * returns 0 at @phys
1431 * return value contains 0 (success) or error code
1432 */
Theodore Ts'o1f109d52010-10-27 21:30:14 -04001433static int ext4_ext_search_right(struct inode *inode,
1434 struct ext4_ext_path *path,
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04001435 ext4_lblk_t *logical, ext4_fsblk_t *phys,
1436 struct ext4_extent **ret_ex)
Alex Tomas1988b512008-01-28 23:58:27 -05001437{
1438 struct buffer_head *bh = NULL;
1439 struct ext4_extent_header *eh;
1440 struct ext4_extent_idx *ix;
1441 struct ext4_extent *ex;
1442 ext4_fsblk_t block;
Eric Sandeen395a87b2009-03-10 18:18:47 -04001443 int depth; /* Note, NOT eh_depth; depth from top of tree */
1444 int ee_len;
Alex Tomas1988b512008-01-28 23:58:27 -05001445
Frank Mayhar273df552010-03-02 11:46:09 -05001446 if (unlikely(path == NULL)) {
1447 EXT4_ERROR_INODE(inode, "path == NULL *logical %d!", *logical);
1448 return -EIO;
1449 }
Alex Tomas1988b512008-01-28 23:58:27 -05001450 depth = path->p_depth;
1451 *phys = 0;
1452
1453 if (depth == 0 && path->p_ext == NULL)
1454 return 0;
1455
1456 /* usually extent in the path covers blocks smaller
1457 * then *logical, but it can be that extent is the
1458 * first one in the file */
1459
1460 ex = path[depth].p_ext;
Aneesh Kumar K.Vb939e372008-01-28 23:58:27 -05001461 ee_len = ext4_ext_get_actual_len(ex);
Alex Tomas1988b512008-01-28 23:58:27 -05001462 if (*logical < le32_to_cpu(ex->ee_block)) {
Frank Mayhar273df552010-03-02 11:46:09 -05001463 if (unlikely(EXT_FIRST_EXTENT(path[depth].p_hdr) != ex)) {
1464 EXT4_ERROR_INODE(inode,
1465 "first_extent(path[%d].p_hdr) != ex",
1466 depth);
1467 return -EIO;
1468 }
Alex Tomas1988b512008-01-28 23:58:27 -05001469 while (--depth >= 0) {
1470 ix = path[depth].p_idx;
Frank Mayhar273df552010-03-02 11:46:09 -05001471 if (unlikely(ix != EXT_FIRST_INDEX(path[depth].p_hdr))) {
1472 EXT4_ERROR_INODE(inode,
1473 "ix != EXT_FIRST_INDEX *logical %d!",
1474 *logical);
1475 return -EIO;
1476 }
Alex Tomas1988b512008-01-28 23:58:27 -05001477 }
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04001478 goto found_extent;
Alex Tomas1988b512008-01-28 23:58:27 -05001479 }
1480
Frank Mayhar273df552010-03-02 11:46:09 -05001481 if (unlikely(*logical < (le32_to_cpu(ex->ee_block) + ee_len))) {
1482 EXT4_ERROR_INODE(inode,
1483 "logical %d < ee_block %d + ee_len %d!",
1484 *logical, le32_to_cpu(ex->ee_block), ee_len);
1485 return -EIO;
1486 }
Alex Tomas1988b512008-01-28 23:58:27 -05001487
1488 if (ex != EXT_LAST_EXTENT(path[depth].p_hdr)) {
1489 /* next allocated block in this leaf */
1490 ex++;
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04001491 goto found_extent;
Alex Tomas1988b512008-01-28 23:58:27 -05001492 }
1493
1494 /* go up and search for index to the right */
1495 while (--depth >= 0) {
1496 ix = path[depth].p_idx;
1497 if (ix != EXT_LAST_INDEX(path[depth].p_hdr))
Wu Fengguang25f1ee32008-11-25 17:24:23 -05001498 goto got_index;
Alex Tomas1988b512008-01-28 23:58:27 -05001499 }
1500
Wu Fengguang25f1ee32008-11-25 17:24:23 -05001501 /* we've gone up to the root and found no index to the right */
1502 return 0;
Alex Tomas1988b512008-01-28 23:58:27 -05001503
Wu Fengguang25f1ee32008-11-25 17:24:23 -05001504got_index:
Alex Tomas1988b512008-01-28 23:58:27 -05001505 /* we've found index to the right, let's
1506 * follow it and find the closest allocated
1507 * block to the right */
1508 ix++;
Theodore Ts'obf89d162010-10-27 21:30:14 -04001509 block = ext4_idx_pblock(ix);
Alex Tomas1988b512008-01-28 23:58:27 -05001510 while (++depth < path->p_depth) {
Eric Sandeen395a87b2009-03-10 18:18:47 -04001511 /* subtract from p_depth to get proper eh_depth */
Theodore Ts'o7d7ea892013-08-16 21:20:41 -04001512 bh = read_extent_tree_block(inode, block,
Theodore Ts'o107a7bd2013-08-16 21:23:41 -04001513 path->p_depth - depth, 0);
Theodore Ts'o7d7ea892013-08-16 21:20:41 -04001514 if (IS_ERR(bh))
1515 return PTR_ERR(bh);
1516 eh = ext_block_hdr(bh);
Alex Tomas1988b512008-01-28 23:58:27 -05001517 ix = EXT_FIRST_INDEX(eh);
Theodore Ts'obf89d162010-10-27 21:30:14 -04001518 block = ext4_idx_pblock(ix);
Alex Tomas1988b512008-01-28 23:58:27 -05001519 put_bh(bh);
1520 }
1521
Theodore Ts'o107a7bd2013-08-16 21:23:41 -04001522 bh = read_extent_tree_block(inode, block, path->p_depth - depth, 0);
Theodore Ts'o7d7ea892013-08-16 21:20:41 -04001523 if (IS_ERR(bh))
1524 return PTR_ERR(bh);
Alex Tomas1988b512008-01-28 23:58:27 -05001525 eh = ext_block_hdr(bh);
Alex Tomas1988b512008-01-28 23:58:27 -05001526 ex = EXT_FIRST_EXTENT(eh);
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04001527found_extent:
Alex Tomas1988b512008-01-28 23:58:27 -05001528 *logical = le32_to_cpu(ex->ee_block);
Theodore Ts'obf89d162010-10-27 21:30:14 -04001529 *phys = ext4_ext_pblock(ex);
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04001530 *ret_ex = ex;
1531 if (bh)
1532 put_bh(bh);
Alex Tomas1988b512008-01-28 23:58:27 -05001533 return 0;
Alex Tomas1988b512008-01-28 23:58:27 -05001534}
1535
1536/*
Randy Dunlapd0d856e2006-10-11 01:21:07 -07001537 * ext4_ext_next_allocated_block:
Lukas Czernerf17722f2011-06-06 00:05:17 -04001538 * returns allocated block in subsequent extent or EXT_MAX_BLOCKS.
Randy Dunlapd0d856e2006-10-11 01:21:07 -07001539 * NOTE: it considers block number from index entry as
1540 * allocated block. Thus, index entries have to be consistent
1541 * with leaves.
Alex Tomasa86c6182006-10-11 01:21:03 -07001542 */
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05001543static ext4_lblk_t
Alex Tomasa86c6182006-10-11 01:21:03 -07001544ext4_ext_next_allocated_block(struct ext4_ext_path *path)
1545{
1546 int depth;
1547
1548 BUG_ON(path == NULL);
1549 depth = path->p_depth;
1550
1551 if (depth == 0 && path->p_ext == NULL)
Lukas Czernerf17722f2011-06-06 00:05:17 -04001552 return EXT_MAX_BLOCKS;
Alex Tomasa86c6182006-10-11 01:21:03 -07001553
1554 while (depth >= 0) {
1555 if (depth == path->p_depth) {
1556 /* leaf */
Curt Wohlgemuth6f8ff532011-10-26 04:38:59 -04001557 if (path[depth].p_ext &&
1558 path[depth].p_ext !=
Alex Tomasa86c6182006-10-11 01:21:03 -07001559 EXT_LAST_EXTENT(path[depth].p_hdr))
1560 return le32_to_cpu(path[depth].p_ext[1].ee_block);
1561 } else {
1562 /* index */
1563 if (path[depth].p_idx !=
1564 EXT_LAST_INDEX(path[depth].p_hdr))
1565 return le32_to_cpu(path[depth].p_idx[1].ei_block);
1566 }
1567 depth--;
1568 }
1569
Lukas Czernerf17722f2011-06-06 00:05:17 -04001570 return EXT_MAX_BLOCKS;
Alex Tomasa86c6182006-10-11 01:21:03 -07001571}
1572
1573/*
Randy Dunlapd0d856e2006-10-11 01:21:07 -07001574 * ext4_ext_next_leaf_block:
Lukas Czernerf17722f2011-06-06 00:05:17 -04001575 * returns first allocated block from next leaf or EXT_MAX_BLOCKS
Alex Tomasa86c6182006-10-11 01:21:03 -07001576 */
Robin Dong57187892011-07-23 21:49:07 -04001577static ext4_lblk_t ext4_ext_next_leaf_block(struct ext4_ext_path *path)
Alex Tomasa86c6182006-10-11 01:21:03 -07001578{
1579 int depth;
1580
1581 BUG_ON(path == NULL);
1582 depth = path->p_depth;
1583
1584 /* zero-tree has no leaf blocks at all */
1585 if (depth == 0)
Lukas Czernerf17722f2011-06-06 00:05:17 -04001586 return EXT_MAX_BLOCKS;
Alex Tomasa86c6182006-10-11 01:21:03 -07001587
1588 /* go to index block */
1589 depth--;
1590
1591 while (depth >= 0) {
1592 if (path[depth].p_idx !=
1593 EXT_LAST_INDEX(path[depth].p_hdr))
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05001594 return (ext4_lblk_t)
1595 le32_to_cpu(path[depth].p_idx[1].ei_block);
Alex Tomasa86c6182006-10-11 01:21:03 -07001596 depth--;
1597 }
1598
Lukas Czernerf17722f2011-06-06 00:05:17 -04001599 return EXT_MAX_BLOCKS;
Alex Tomasa86c6182006-10-11 01:21:03 -07001600}
1601
1602/*
Randy Dunlapd0d856e2006-10-11 01:21:07 -07001603 * ext4_ext_correct_indexes:
1604 * if leaf gets modified and modified extent is first in the leaf,
1605 * then we have to correct all indexes above.
Alex Tomasa86c6182006-10-11 01:21:03 -07001606 * TODO: do we need to correct tree in all cases?
1607 */
Aneesh Kumar K.V1d03ec92008-01-28 23:58:27 -05001608static int ext4_ext_correct_indexes(handle_t *handle, struct inode *inode,
Alex Tomasa86c6182006-10-11 01:21:03 -07001609 struct ext4_ext_path *path)
1610{
1611 struct ext4_extent_header *eh;
1612 int depth = ext_depth(inode);
1613 struct ext4_extent *ex;
1614 __le32 border;
1615 int k, err = 0;
1616
1617 eh = path[depth].p_hdr;
1618 ex = path[depth].p_ext;
Frank Mayhar273df552010-03-02 11:46:09 -05001619
1620 if (unlikely(ex == NULL || eh == NULL)) {
1621 EXT4_ERROR_INODE(inode,
1622 "ex %p == NULL or eh %p == NULL", ex, eh);
1623 return -EIO;
1624 }
Alex Tomasa86c6182006-10-11 01:21:03 -07001625
1626 if (depth == 0) {
1627 /* there is no tree at all */
1628 return 0;
1629 }
1630
1631 if (ex != EXT_FIRST_EXTENT(eh)) {
1632 /* we correct tree if first leaf got modified only */
1633 return 0;
1634 }
1635
1636 /*
Randy Dunlapd0d856e2006-10-11 01:21:07 -07001637 * TODO: we need correction if border is smaller than current one
Alex Tomasa86c6182006-10-11 01:21:03 -07001638 */
1639 k = depth - 1;
1640 border = path[depth].p_ext->ee_block;
Avantika Mathur7e028972006-12-06 20:41:33 -08001641 err = ext4_ext_get_access(handle, inode, path + k);
1642 if (err)
Alex Tomasa86c6182006-10-11 01:21:03 -07001643 return err;
1644 path[k].p_idx->ei_block = border;
Avantika Mathur7e028972006-12-06 20:41:33 -08001645 err = ext4_ext_dirty(handle, inode, path + k);
1646 if (err)
Alex Tomasa86c6182006-10-11 01:21:03 -07001647 return err;
1648
1649 while (k--) {
1650 /* change all left-side indexes */
1651 if (path[k+1].p_idx != EXT_FIRST_INDEX(path[k+1].p_hdr))
1652 break;
Avantika Mathur7e028972006-12-06 20:41:33 -08001653 err = ext4_ext_get_access(handle, inode, path + k);
1654 if (err)
Alex Tomasa86c6182006-10-11 01:21:03 -07001655 break;
1656 path[k].p_idx->ei_block = border;
Avantika Mathur7e028972006-12-06 20:41:33 -08001657 err = ext4_ext_dirty(handle, inode, path + k);
1658 if (err)
Alex Tomasa86c6182006-10-11 01:21:03 -07001659 break;
1660 }
1661
1662 return err;
1663}
1664
Akira Fujita748de672009-06-17 19:24:03 -04001665int
Alex Tomasa86c6182006-10-11 01:21:03 -07001666ext4_can_extents_be_merged(struct inode *inode, struct ext4_extent *ex1,
1667 struct ext4_extent *ex2)
1668{
Amit Arora749269f2007-07-18 09:02:56 -04001669 unsigned short ext1_ee_len, ext2_ee_len, max_len;
Amit Aroraa2df2a62007-07-17 21:42:41 -04001670
1671 /*
Dmitry Monakhovec22ba82013-03-04 00:36:06 -05001672 * Make sure that both extents are initialized. We don't merge
1673 * uninitialized extents so that we can be sure that end_io code has
1674 * the extent that was written properly split out and conversion to
1675 * initialized is trivial.
Amit Aroraa2df2a62007-07-17 21:42:41 -04001676 */
Dmitry Monakhovec22ba82013-03-04 00:36:06 -05001677 if (ext4_ext_is_uninitialized(ex1) || ext4_ext_is_uninitialized(ex2))
Amit Aroraa2df2a62007-07-17 21:42:41 -04001678 return 0;
1679
Amit Arora749269f2007-07-18 09:02:56 -04001680 if (ext4_ext_is_uninitialized(ex1))
1681 max_len = EXT_UNINIT_MAX_LEN;
1682 else
1683 max_len = EXT_INIT_MAX_LEN;
1684
Amit Aroraa2df2a62007-07-17 21:42:41 -04001685 ext1_ee_len = ext4_ext_get_actual_len(ex1);
1686 ext2_ee_len = ext4_ext_get_actual_len(ex2);
1687
1688 if (le32_to_cpu(ex1->ee_block) + ext1_ee_len !=
Andrew Morton63f57932006-10-11 01:21:24 -07001689 le32_to_cpu(ex2->ee_block))
Alex Tomasa86c6182006-10-11 01:21:03 -07001690 return 0;
1691
Suparna Bhattacharya471d4012006-10-11 01:21:06 -07001692 /*
1693 * To allow future support for preallocated extents to be added
1694 * as an RO_COMPAT feature, refuse to merge to extents if
Randy Dunlapd0d856e2006-10-11 01:21:07 -07001695 * this can result in the top bit of ee_len being set.
Suparna Bhattacharya471d4012006-10-11 01:21:06 -07001696 */
Amit Arora749269f2007-07-18 09:02:56 -04001697 if (ext1_ee_len + ext2_ee_len > max_len)
Suparna Bhattacharya471d4012006-10-11 01:21:06 -07001698 return 0;
Robert P. J. Daybbf2f9f2007-02-17 19:20:16 +01001699#ifdef AGGRESSIVE_TEST
Aneesh Kumar K.Vb939e372008-01-28 23:58:27 -05001700 if (ext1_ee_len >= 4)
Alex Tomasa86c6182006-10-11 01:21:03 -07001701 return 0;
1702#endif
1703
Theodore Ts'obf89d162010-10-27 21:30:14 -04001704 if (ext4_ext_pblock(ex1) + ext1_ee_len == ext4_ext_pblock(ex2))
Alex Tomasa86c6182006-10-11 01:21:03 -07001705 return 1;
1706 return 0;
1707}
1708
1709/*
Amit Arora56055d32007-07-17 21:42:38 -04001710 * This function tries to merge the "ex" extent to the next extent in the tree.
1711 * It always tries to merge towards right. If you want to merge towards
1712 * left, pass "ex - 1" as argument instead of "ex".
1713 * Returns 0 if the extents (ex and ex+1) were _not_ merged and returns
1714 * 1 if they got merged.
1715 */
Yongqiang Yang197217a2011-05-03 11:45:29 -04001716static int ext4_ext_try_to_merge_right(struct inode *inode,
Theodore Ts'o1f109d52010-10-27 21:30:14 -04001717 struct ext4_ext_path *path,
1718 struct ext4_extent *ex)
Amit Arora56055d32007-07-17 21:42:38 -04001719{
1720 struct ext4_extent_header *eh;
1721 unsigned int depth, len;
1722 int merge_done = 0;
1723 int uninitialized = 0;
1724
1725 depth = ext_depth(inode);
1726 BUG_ON(path[depth].p_hdr == NULL);
1727 eh = path[depth].p_hdr;
1728
1729 while (ex < EXT_LAST_EXTENT(eh)) {
1730 if (!ext4_can_extents_be_merged(inode, ex, ex + 1))
1731 break;
1732 /* merge with next extent! */
1733 if (ext4_ext_is_uninitialized(ex))
1734 uninitialized = 1;
1735 ex->ee_len = cpu_to_le16(ext4_ext_get_actual_len(ex)
1736 + ext4_ext_get_actual_len(ex + 1));
1737 if (uninitialized)
1738 ext4_ext_mark_uninitialized(ex);
1739
1740 if (ex + 1 < EXT_LAST_EXTENT(eh)) {
1741 len = (EXT_LAST_EXTENT(eh) - ex - 1)
1742 * sizeof(struct ext4_extent);
1743 memmove(ex + 1, ex + 2, len);
1744 }
Marcin Slusarze8546d02008-04-17 10:38:59 -04001745 le16_add_cpu(&eh->eh_entries, -1);
Amit Arora56055d32007-07-17 21:42:38 -04001746 merge_done = 1;
1747 WARN_ON(eh->eh_entries == 0);
1748 if (!eh->eh_entries)
Theodore Ts'o24676da2010-05-16 21:00:00 -04001749 EXT4_ERROR_INODE(inode, "eh->eh_entries = 0!");
Amit Arora56055d32007-07-17 21:42:38 -04001750 }
1751
1752 return merge_done;
1753}
1754
1755/*
Theodore Ts'oecb94f52012-08-17 09:44:17 -04001756 * This function does a very simple check to see if we can collapse
1757 * an extent tree with a single extent tree leaf block into the inode.
1758 */
1759static void ext4_ext_try_to_merge_up(handle_t *handle,
1760 struct inode *inode,
1761 struct ext4_ext_path *path)
1762{
1763 size_t s;
1764 unsigned max_root = ext4_ext_space_root(inode, 0);
1765 ext4_fsblk_t blk;
1766
1767 if ((path[0].p_depth != 1) ||
1768 (le16_to_cpu(path[0].p_hdr->eh_entries) != 1) ||
1769 (le16_to_cpu(path[1].p_hdr->eh_entries) > max_root))
1770 return;
1771
1772 /*
1773 * We need to modify the block allocation bitmap and the block
1774 * group descriptor to release the extent tree block. If we
1775 * can't get the journal credits, give up.
1776 */
1777 if (ext4_journal_extend(handle, 2))
1778 return;
1779
1780 /*
1781 * Copy the extent data up to the inode
1782 */
1783 blk = ext4_idx_pblock(path[0].p_idx);
1784 s = le16_to_cpu(path[1].p_hdr->eh_entries) *
1785 sizeof(struct ext4_extent_idx);
1786 s += sizeof(struct ext4_extent_header);
1787
1788 memcpy(path[0].p_hdr, path[1].p_hdr, s);
1789 path[0].p_depth = 0;
1790 path[0].p_ext = EXT_FIRST_EXTENT(path[0].p_hdr) +
1791 (path[1].p_ext - EXT_FIRST_EXTENT(path[1].p_hdr));
1792 path[0].p_hdr->eh_max = cpu_to_le16(max_root);
1793
1794 brelse(path[1].p_bh);
1795 ext4_free_blocks(handle, inode, NULL, blk, 1,
Jan Kara7d734532013-08-17 09:36:54 -04001796 EXT4_FREE_BLOCKS_METADATA | EXT4_FREE_BLOCKS_FORGET |
1797 EXT4_FREE_BLOCKS_RESERVE);
Theodore Ts'oecb94f52012-08-17 09:44:17 -04001798}
1799
1800/*
Yongqiang Yang197217a2011-05-03 11:45:29 -04001801 * This function tries to merge the @ex extent to neighbours in the tree.
1802 * return 1 if merge left else 0.
1803 */
Theodore Ts'oecb94f52012-08-17 09:44:17 -04001804static void ext4_ext_try_to_merge(handle_t *handle,
1805 struct inode *inode,
Yongqiang Yang197217a2011-05-03 11:45:29 -04001806 struct ext4_ext_path *path,
1807 struct ext4_extent *ex) {
1808 struct ext4_extent_header *eh;
1809 unsigned int depth;
1810 int merge_done = 0;
Yongqiang Yang197217a2011-05-03 11:45:29 -04001811
1812 depth = ext_depth(inode);
1813 BUG_ON(path[depth].p_hdr == NULL);
1814 eh = path[depth].p_hdr;
1815
1816 if (ex > EXT_FIRST_EXTENT(eh))
1817 merge_done = ext4_ext_try_to_merge_right(inode, path, ex - 1);
1818
1819 if (!merge_done)
Theodore Ts'oecb94f52012-08-17 09:44:17 -04001820 (void) ext4_ext_try_to_merge_right(inode, path, ex);
Yongqiang Yang197217a2011-05-03 11:45:29 -04001821
Theodore Ts'oecb94f52012-08-17 09:44:17 -04001822 ext4_ext_try_to_merge_up(handle, inode, path);
Yongqiang Yang197217a2011-05-03 11:45:29 -04001823}
1824
1825/*
Amit Arora25d14f92007-05-24 13:04:13 -04001826 * check if a portion of the "newext" extent overlaps with an
1827 * existing extent.
1828 *
1829 * If there is an overlap discovered, it updates the length of the newext
1830 * such that there will be no overlap, and then returns 1.
1831 * If there is no overlap found, it returns 0.
1832 */
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04001833static unsigned int ext4_ext_check_overlap(struct ext4_sb_info *sbi,
1834 struct inode *inode,
Theodore Ts'o1f109d52010-10-27 21:30:14 -04001835 struct ext4_extent *newext,
1836 struct ext4_ext_path *path)
Amit Arora25d14f92007-05-24 13:04:13 -04001837{
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05001838 ext4_lblk_t b1, b2;
Amit Arora25d14f92007-05-24 13:04:13 -04001839 unsigned int depth, len1;
1840 unsigned int ret = 0;
1841
1842 b1 = le32_to_cpu(newext->ee_block);
Amit Aroraa2df2a62007-07-17 21:42:41 -04001843 len1 = ext4_ext_get_actual_len(newext);
Amit Arora25d14f92007-05-24 13:04:13 -04001844 depth = ext_depth(inode);
1845 if (!path[depth].p_ext)
1846 goto out;
1847 b2 = le32_to_cpu(path[depth].p_ext->ee_block);
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04001848 b2 &= ~(sbi->s_cluster_ratio - 1);
Amit Arora25d14f92007-05-24 13:04:13 -04001849
1850 /*
1851 * get the next allocated block if the extent in the path
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001852 * is before the requested block(s)
Amit Arora25d14f92007-05-24 13:04:13 -04001853 */
1854 if (b2 < b1) {
1855 b2 = ext4_ext_next_allocated_block(path);
Lukas Czernerf17722f2011-06-06 00:05:17 -04001856 if (b2 == EXT_MAX_BLOCKS)
Amit Arora25d14f92007-05-24 13:04:13 -04001857 goto out;
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04001858 b2 &= ~(sbi->s_cluster_ratio - 1);
Amit Arora25d14f92007-05-24 13:04:13 -04001859 }
1860
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05001861 /* check for wrap through zero on extent logical start block*/
Amit Arora25d14f92007-05-24 13:04:13 -04001862 if (b1 + len1 < b1) {
Lukas Czernerf17722f2011-06-06 00:05:17 -04001863 len1 = EXT_MAX_BLOCKS - b1;
Amit Arora25d14f92007-05-24 13:04:13 -04001864 newext->ee_len = cpu_to_le16(len1);
1865 ret = 1;
1866 }
1867
1868 /* check for overlap */
1869 if (b1 + len1 > b2) {
1870 newext->ee_len = cpu_to_le16(b2 - b1);
1871 ret = 1;
1872 }
1873out:
1874 return ret;
1875}
1876
1877/*
Randy Dunlapd0d856e2006-10-11 01:21:07 -07001878 * ext4_ext_insert_extent:
1879 * tries to merge requsted extent into the existing extent or
1880 * inserts requested extent as new one into the tree,
1881 * creating new leaf in the no-space case.
Alex Tomasa86c6182006-10-11 01:21:03 -07001882 */
1883int ext4_ext_insert_extent(handle_t *handle, struct inode *inode,
1884 struct ext4_ext_path *path,
Theodore Ts'o107a7bd2013-08-16 21:23:41 -04001885 struct ext4_extent *newext, int gb_flags)
Alex Tomasa86c6182006-10-11 01:21:03 -07001886{
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001887 struct ext4_extent_header *eh;
Alex Tomasa86c6182006-10-11 01:21:03 -07001888 struct ext4_extent *ex, *fex;
1889 struct ext4_extent *nearex; /* nearest extent */
1890 struct ext4_ext_path *npath = NULL;
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05001891 int depth, len, err;
1892 ext4_lblk_t next;
Amit Aroraa2df2a62007-07-17 21:42:41 -04001893 unsigned uninitialized = 0;
Theodore Ts'o107a7bd2013-08-16 21:23:41 -04001894 int mb_flags = 0;
Alex Tomasa86c6182006-10-11 01:21:03 -07001895
Frank Mayhar273df552010-03-02 11:46:09 -05001896 if (unlikely(ext4_ext_get_actual_len(newext) == 0)) {
1897 EXT4_ERROR_INODE(inode, "ext4_ext_get_actual_len(newext) == 0");
1898 return -EIO;
1899 }
Alex Tomasa86c6182006-10-11 01:21:03 -07001900 depth = ext_depth(inode);
1901 ex = path[depth].p_ext;
Lukas Czernerbe8981b2013-04-03 23:33:28 -04001902 eh = path[depth].p_hdr;
Frank Mayhar273df552010-03-02 11:46:09 -05001903 if (unlikely(path[depth].p_hdr == NULL)) {
1904 EXT4_ERROR_INODE(inode, "path[%d].p_hdr == NULL", depth);
1905 return -EIO;
1906 }
Alex Tomasa86c6182006-10-11 01:21:03 -07001907
1908 /* try to insert block into found extent and return */
Theodore Ts'o107a7bd2013-08-16 21:23:41 -04001909 if (ex && !(gb_flags & EXT4_GET_BLOCKS_PRE_IO)) {
Amit Aroraa2df2a62007-07-17 21:42:41 -04001910
1911 /*
Lukas Czernerbe8981b2013-04-03 23:33:28 -04001912 * Try to see whether we should rather test the extent on
1913 * right from ex, or from the left of ex. This is because
1914 * ext4_ext_find_extent() can return either extent on the
1915 * left, or on the right from the searched position. This
1916 * will make merging more effective.
Amit Aroraa2df2a62007-07-17 21:42:41 -04001917 */
Lukas Czernerbe8981b2013-04-03 23:33:28 -04001918 if (ex < EXT_LAST_EXTENT(eh) &&
1919 (le32_to_cpu(ex->ee_block) +
1920 ext4_ext_get_actual_len(ex) <
1921 le32_to_cpu(newext->ee_block))) {
1922 ex += 1;
1923 goto prepend;
1924 } else if ((ex > EXT_FIRST_EXTENT(eh)) &&
1925 (le32_to_cpu(newext->ee_block) +
1926 ext4_ext_get_actual_len(newext) <
1927 le32_to_cpu(ex->ee_block)))
1928 ex -= 1;
1929
1930 /* Try to append newex to the ex */
1931 if (ext4_can_extents_be_merged(inode, ex, newext)) {
1932 ext_debug("append [%d]%d block to %u:[%d]%d"
1933 "(from %llu)\n",
1934 ext4_ext_is_uninitialized(newext),
1935 ext4_ext_get_actual_len(newext),
1936 le32_to_cpu(ex->ee_block),
1937 ext4_ext_is_uninitialized(ex),
1938 ext4_ext_get_actual_len(ex),
1939 ext4_ext_pblock(ex));
1940 err = ext4_ext_get_access(handle, inode,
1941 path + depth);
1942 if (err)
1943 return err;
1944
1945 /*
1946 * ext4_can_extents_be_merged should have checked
1947 * that either both extents are uninitialized, or
1948 * both aren't. Thus we need to check only one of
1949 * them here.
1950 */
1951 if (ext4_ext_is_uninitialized(ex))
1952 uninitialized = 1;
1953 ex->ee_len = cpu_to_le16(ext4_ext_get_actual_len(ex)
Amit Aroraa2df2a62007-07-17 21:42:41 -04001954 + ext4_ext_get_actual_len(newext));
Lukas Czernerbe8981b2013-04-03 23:33:28 -04001955 if (uninitialized)
1956 ext4_ext_mark_uninitialized(ex);
1957 eh = path[depth].p_hdr;
1958 nearex = ex;
1959 goto merge;
1960 }
1961
1962prepend:
1963 /* Try to prepend newex to the ex */
1964 if (ext4_can_extents_be_merged(inode, newext, ex)) {
1965 ext_debug("prepend %u[%d]%d block to %u:[%d]%d"
1966 "(from %llu)\n",
1967 le32_to_cpu(newext->ee_block),
1968 ext4_ext_is_uninitialized(newext),
1969 ext4_ext_get_actual_len(newext),
1970 le32_to_cpu(ex->ee_block),
1971 ext4_ext_is_uninitialized(ex),
1972 ext4_ext_get_actual_len(ex),
1973 ext4_ext_pblock(ex));
1974 err = ext4_ext_get_access(handle, inode,
1975 path + depth);
1976 if (err)
1977 return err;
1978
1979 /*
1980 * ext4_can_extents_be_merged should have checked
1981 * that either both extents are uninitialized, or
1982 * both aren't. Thus we need to check only one of
1983 * them here.
1984 */
1985 if (ext4_ext_is_uninitialized(ex))
1986 uninitialized = 1;
1987 ex->ee_block = newext->ee_block;
1988 ext4_ext_store_pblock(ex, ext4_ext_pblock(newext));
1989 ex->ee_len = cpu_to_le16(ext4_ext_get_actual_len(ex)
1990 + ext4_ext_get_actual_len(newext));
1991 if (uninitialized)
1992 ext4_ext_mark_uninitialized(ex);
1993 eh = path[depth].p_hdr;
1994 nearex = ex;
1995 goto merge;
1996 }
Alex Tomasa86c6182006-10-11 01:21:03 -07001997 }
1998
Alex Tomasa86c6182006-10-11 01:21:03 -07001999 depth = ext_depth(inode);
2000 eh = path[depth].p_hdr;
2001 if (le16_to_cpu(eh->eh_entries) < le16_to_cpu(eh->eh_max))
2002 goto has_space;
2003
2004 /* probably next leaf has space for us? */
2005 fex = EXT_LAST_EXTENT(eh);
Robin Dong598dbdf2011-07-11 18:24:01 -04002006 next = EXT_MAX_BLOCKS;
2007 if (le32_to_cpu(newext->ee_block) > le32_to_cpu(fex->ee_block))
Robin Dong57187892011-07-23 21:49:07 -04002008 next = ext4_ext_next_leaf_block(path);
Robin Dong598dbdf2011-07-11 18:24:01 -04002009 if (next != EXT_MAX_BLOCKS) {
Yongqiang Yang32de6752011-11-01 18:56:41 -04002010 ext_debug("next leaf block - %u\n", next);
Alex Tomasa86c6182006-10-11 01:21:03 -07002011 BUG_ON(npath != NULL);
Theodore Ts'o107a7bd2013-08-16 21:23:41 -04002012 npath = ext4_ext_find_extent(inode, next, NULL, 0);
Alex Tomasa86c6182006-10-11 01:21:03 -07002013 if (IS_ERR(npath))
2014 return PTR_ERR(npath);
2015 BUG_ON(npath->p_depth != path->p_depth);
2016 eh = npath[depth].p_hdr;
2017 if (le16_to_cpu(eh->eh_entries) < le16_to_cpu(eh->eh_max)) {
Lucas De Marchi25985ed2011-03-30 22:57:33 -03002018 ext_debug("next leaf isn't full(%d)\n",
Alex Tomasa86c6182006-10-11 01:21:03 -07002019 le16_to_cpu(eh->eh_entries));
2020 path = npath;
Robin Dongffb505f2011-07-11 11:43:59 -04002021 goto has_space;
Alex Tomasa86c6182006-10-11 01:21:03 -07002022 }
2023 ext_debug("next leaf has no free space(%d,%d)\n",
2024 le16_to_cpu(eh->eh_entries), le16_to_cpu(eh->eh_max));
2025 }
2026
2027 /*
Randy Dunlapd0d856e2006-10-11 01:21:07 -07002028 * There is no free space in the found leaf.
2029 * We're gonna add a new leaf in the tree.
Alex Tomasa86c6182006-10-11 01:21:03 -07002030 */
Theodore Ts'o107a7bd2013-08-16 21:23:41 -04002031 if (gb_flags & EXT4_GET_BLOCKS_METADATA_NOFAIL)
2032 mb_flags = EXT4_MB_USE_RESERVED;
2033 err = ext4_ext_create_new_leaf(handle, inode, mb_flags, gb_flags,
2034 path, newext);
Alex Tomasa86c6182006-10-11 01:21:03 -07002035 if (err)
2036 goto cleanup;
2037 depth = ext_depth(inode);
2038 eh = path[depth].p_hdr;
2039
2040has_space:
2041 nearex = path[depth].p_ext;
2042
Avantika Mathur7e028972006-12-06 20:41:33 -08002043 err = ext4_ext_get_access(handle, inode, path + depth);
2044 if (err)
Alex Tomasa86c6182006-10-11 01:21:03 -07002045 goto cleanup;
2046
2047 if (!nearex) {
2048 /* there is no extent in this leaf, create first one */
Yongqiang Yang32de6752011-11-01 18:56:41 -04002049 ext_debug("first extent in the leaf: %u:%llu:[%d]%d\n",
Dave Kleikamp8c55e202007-05-24 13:04:54 -04002050 le32_to_cpu(newext->ee_block),
Theodore Ts'obf89d162010-10-27 21:30:14 -04002051 ext4_ext_pblock(newext),
Mingming553f9002009-09-18 13:34:55 -04002052 ext4_ext_is_uninitialized(newext),
Amit Aroraa2df2a62007-07-17 21:42:41 -04002053 ext4_ext_get_actual_len(newext));
Eric Gouriou80e675f2011-10-27 11:52:18 -04002054 nearex = EXT_FIRST_EXTENT(eh);
2055 } else {
2056 if (le32_to_cpu(newext->ee_block)
Dave Kleikamp8c55e202007-05-24 13:04:54 -04002057 > le32_to_cpu(nearex->ee_block)) {
Eric Gouriou80e675f2011-10-27 11:52:18 -04002058 /* Insert after */
Yongqiang Yang32de6752011-11-01 18:56:41 -04002059 ext_debug("insert %u:%llu:[%d]%d before: "
2060 "nearest %p\n",
Dave Kleikamp8c55e202007-05-24 13:04:54 -04002061 le32_to_cpu(newext->ee_block),
Theodore Ts'obf89d162010-10-27 21:30:14 -04002062 ext4_ext_pblock(newext),
Mingming553f9002009-09-18 13:34:55 -04002063 ext4_ext_is_uninitialized(newext),
Amit Aroraa2df2a62007-07-17 21:42:41 -04002064 ext4_ext_get_actual_len(newext),
Eric Gouriou80e675f2011-10-27 11:52:18 -04002065 nearex);
2066 nearex++;
2067 } else {
2068 /* Insert before */
2069 BUG_ON(newext->ee_block == nearex->ee_block);
Yongqiang Yang32de6752011-11-01 18:56:41 -04002070 ext_debug("insert %u:%llu:[%d]%d after: "
2071 "nearest %p\n",
Eric Gouriou80e675f2011-10-27 11:52:18 -04002072 le32_to_cpu(newext->ee_block),
2073 ext4_ext_pblock(newext),
2074 ext4_ext_is_uninitialized(newext),
2075 ext4_ext_get_actual_len(newext),
2076 nearex);
Alex Tomasa86c6182006-10-11 01:21:03 -07002077 }
Eric Gouriou80e675f2011-10-27 11:52:18 -04002078 len = EXT_LAST_EXTENT(eh) - nearex + 1;
2079 if (len > 0) {
Yongqiang Yang32de6752011-11-01 18:56:41 -04002080 ext_debug("insert %u:%llu:[%d]%d: "
Eric Gouriou80e675f2011-10-27 11:52:18 -04002081 "move %d extents from 0x%p to 0x%p\n",
2082 le32_to_cpu(newext->ee_block),
2083 ext4_ext_pblock(newext),
2084 ext4_ext_is_uninitialized(newext),
2085 ext4_ext_get_actual_len(newext),
2086 len, nearex, nearex + 1);
2087 memmove(nearex + 1, nearex,
2088 len * sizeof(struct ext4_extent));
2089 }
Alex Tomasa86c6182006-10-11 01:21:03 -07002090 }
2091
Marcin Slusarze8546d02008-04-17 10:38:59 -04002092 le16_add_cpu(&eh->eh_entries, 1);
Eric Gouriou80e675f2011-10-27 11:52:18 -04002093 path[depth].p_ext = nearex;
Alex Tomasa86c6182006-10-11 01:21:03 -07002094 nearex->ee_block = newext->ee_block;
Theodore Ts'obf89d162010-10-27 21:30:14 -04002095 ext4_ext_store_pblock(nearex, ext4_ext_pblock(newext));
Alex Tomasa86c6182006-10-11 01:21:03 -07002096 nearex->ee_len = newext->ee_len;
Alex Tomasa86c6182006-10-11 01:21:03 -07002097
2098merge:
HaiboLiue7bcf822012-07-09 16:29:28 -04002099 /* try to merge extents */
Theodore Ts'o107a7bd2013-08-16 21:23:41 -04002100 if (!(gb_flags & EXT4_GET_BLOCKS_PRE_IO))
Theodore Ts'oecb94f52012-08-17 09:44:17 -04002101 ext4_ext_try_to_merge(handle, inode, path, nearex);
Alex Tomasa86c6182006-10-11 01:21:03 -07002102
Alex Tomasa86c6182006-10-11 01:21:03 -07002103
2104 /* time to correct all indexes above */
2105 err = ext4_ext_correct_indexes(handle, inode, path);
2106 if (err)
2107 goto cleanup;
2108
Theodore Ts'oecb94f52012-08-17 09:44:17 -04002109 err = ext4_ext_dirty(handle, inode, path + path->p_depth);
Alex Tomasa86c6182006-10-11 01:21:03 -07002110
2111cleanup:
2112 if (npath) {
2113 ext4_ext_drop_refs(npath);
2114 kfree(npath);
2115 }
Alex Tomasa86c6182006-10-11 01:21:03 -07002116 return err;
2117}
2118
Lukas Czerner91dd8c12012-11-28 12:32:26 -05002119static int ext4_fill_fiemap_extents(struct inode *inode,
2120 ext4_lblk_t block, ext4_lblk_t num,
2121 struct fiemap_extent_info *fieinfo)
Eric Sandeen6873fa02008-10-07 00:46:36 -04002122{
2123 struct ext4_ext_path *path = NULL;
Eric Sandeen6873fa02008-10-07 00:46:36 -04002124 struct ext4_extent *ex;
Zheng Liu69eb33d2013-02-18 00:31:07 -05002125 struct extent_status es;
Lukas Czerner91dd8c12012-11-28 12:32:26 -05002126 ext4_lblk_t next, next_del, start = 0, end = 0;
Eric Sandeen6873fa02008-10-07 00:46:36 -04002127 ext4_lblk_t last = block + num;
Lukas Czerner91dd8c12012-11-28 12:32:26 -05002128 int exists, depth = 0, err = 0;
2129 unsigned int flags = 0;
2130 unsigned char blksize_bits = inode->i_sb->s_blocksize_bits;
Eric Sandeen6873fa02008-10-07 00:46:36 -04002131
Lukas Czernerf17722f2011-06-06 00:05:17 -04002132 while (block < last && block != EXT_MAX_BLOCKS) {
Eric Sandeen6873fa02008-10-07 00:46:36 -04002133 num = last - block;
2134 /* find extent for this block */
Theodore Ts'ofab3a542009-12-09 21:30:02 -05002135 down_read(&EXT4_I(inode)->i_data_sem);
Lukas Czerner91dd8c12012-11-28 12:32:26 -05002136
2137 if (path && ext_depth(inode) != depth) {
2138 /* depth was changed. we have to realloc path */
2139 kfree(path);
2140 path = NULL;
2141 }
2142
Theodore Ts'o107a7bd2013-08-16 21:23:41 -04002143 path = ext4_ext_find_extent(inode, block, path, 0);
Eric Sandeen6873fa02008-10-07 00:46:36 -04002144 if (IS_ERR(path)) {
Lukas Czerner91dd8c12012-11-28 12:32:26 -05002145 up_read(&EXT4_I(inode)->i_data_sem);
Eric Sandeen6873fa02008-10-07 00:46:36 -04002146 err = PTR_ERR(path);
2147 path = NULL;
2148 break;
2149 }
2150
2151 depth = ext_depth(inode);
Frank Mayhar273df552010-03-02 11:46:09 -05002152 if (unlikely(path[depth].p_hdr == NULL)) {
Lukas Czerner91dd8c12012-11-28 12:32:26 -05002153 up_read(&EXT4_I(inode)->i_data_sem);
Frank Mayhar273df552010-03-02 11:46:09 -05002154 EXT4_ERROR_INODE(inode, "path[%d].p_hdr == NULL", depth);
2155 err = -EIO;
2156 break;
2157 }
Eric Sandeen6873fa02008-10-07 00:46:36 -04002158 ex = path[depth].p_ext;
2159 next = ext4_ext_next_allocated_block(path);
Lukas Czerner91dd8c12012-11-28 12:32:26 -05002160 ext4_ext_drop_refs(path);
Eric Sandeen6873fa02008-10-07 00:46:36 -04002161
Lukas Czerner91dd8c12012-11-28 12:32:26 -05002162 flags = 0;
Eric Sandeen6873fa02008-10-07 00:46:36 -04002163 exists = 0;
2164 if (!ex) {
2165 /* there is no extent yet, so try to allocate
2166 * all requested space */
2167 start = block;
2168 end = block + num;
2169 } else if (le32_to_cpu(ex->ee_block) > block) {
2170 /* need to allocate space before found extent */
2171 start = block;
2172 end = le32_to_cpu(ex->ee_block);
2173 if (block + num < end)
2174 end = block + num;
2175 } else if (block >= le32_to_cpu(ex->ee_block)
2176 + ext4_ext_get_actual_len(ex)) {
2177 /* need to allocate space after found extent */
2178 start = block;
2179 end = block + num;
2180 if (end >= next)
2181 end = next;
2182 } else if (block >= le32_to_cpu(ex->ee_block)) {
2183 /*
2184 * some part of requested space is covered
2185 * by found extent
2186 */
2187 start = block;
2188 end = le32_to_cpu(ex->ee_block)
2189 + ext4_ext_get_actual_len(ex);
2190 if (block + num < end)
2191 end = block + num;
2192 exists = 1;
2193 } else {
2194 BUG();
2195 }
2196 BUG_ON(end <= start);
2197
2198 if (!exists) {
Zheng Liu69eb33d2013-02-18 00:31:07 -05002199 es.es_lblk = start;
2200 es.es_len = end - start;
2201 es.es_pblk = 0;
Eric Sandeen6873fa02008-10-07 00:46:36 -04002202 } else {
Zheng Liu69eb33d2013-02-18 00:31:07 -05002203 es.es_lblk = le32_to_cpu(ex->ee_block);
2204 es.es_len = ext4_ext_get_actual_len(ex);
2205 es.es_pblk = ext4_ext_pblock(ex);
Lukas Czerner91dd8c12012-11-28 12:32:26 -05002206 if (ext4_ext_is_uninitialized(ex))
2207 flags |= FIEMAP_EXTENT_UNWRITTEN;
Eric Sandeen6873fa02008-10-07 00:46:36 -04002208 }
2209
Lukas Czerner91dd8c12012-11-28 12:32:26 -05002210 /*
Zheng Liu69eb33d2013-02-18 00:31:07 -05002211 * Find delayed extent and update es accordingly. We call
2212 * it even in !exists case to find out whether es is the
Lukas Czerner91dd8c12012-11-28 12:32:26 -05002213 * last existing extent or not.
2214 */
Zheng Liu69eb33d2013-02-18 00:31:07 -05002215 next_del = ext4_find_delayed_extent(inode, &es);
Lukas Czerner91dd8c12012-11-28 12:32:26 -05002216 if (!exists && next_del) {
2217 exists = 1;
Jie Liu72dac952013-06-12 23:13:59 -04002218 flags |= (FIEMAP_EXTENT_DELALLOC |
2219 FIEMAP_EXTENT_UNKNOWN);
Lukas Czerner91dd8c12012-11-28 12:32:26 -05002220 }
2221 up_read(&EXT4_I(inode)->i_data_sem);
2222
Zheng Liu69eb33d2013-02-18 00:31:07 -05002223 if (unlikely(es.es_len == 0)) {
2224 EXT4_ERROR_INODE(inode, "es.es_len == 0");
Frank Mayhar273df552010-03-02 11:46:09 -05002225 err = -EIO;
2226 break;
2227 }
Eric Sandeen6873fa02008-10-07 00:46:36 -04002228
Zheng Liuf7fec032013-02-18 00:28:47 -05002229 /*
2230 * This is possible iff next == next_del == EXT_MAX_BLOCKS.
2231 * we need to check next == EXT_MAX_BLOCKS because it is
2232 * possible that an extent is with unwritten and delayed
2233 * status due to when an extent is delayed allocated and
2234 * is allocated by fallocate status tree will track both of
2235 * them in a extent.
2236 *
2237 * So we could return a unwritten and delayed extent, and
2238 * its block is equal to 'next'.
2239 */
2240 if (next == next_del && next == EXT_MAX_BLOCKS) {
Lukas Czerner91dd8c12012-11-28 12:32:26 -05002241 flags |= FIEMAP_EXTENT_LAST;
2242 if (unlikely(next_del != EXT_MAX_BLOCKS ||
2243 next != EXT_MAX_BLOCKS)) {
2244 EXT4_ERROR_INODE(inode,
2245 "next extent == %u, next "
2246 "delalloc extent = %u",
2247 next, next_del);
2248 err = -EIO;
2249 break;
2250 }
Eric Sandeen6873fa02008-10-07 00:46:36 -04002251 }
2252
Lukas Czerner91dd8c12012-11-28 12:32:26 -05002253 if (exists) {
2254 err = fiemap_fill_next_extent(fieinfo,
Zheng Liu69eb33d2013-02-18 00:31:07 -05002255 (__u64)es.es_lblk << blksize_bits,
2256 (__u64)es.es_pblk << blksize_bits,
2257 (__u64)es.es_len << blksize_bits,
Lukas Czerner91dd8c12012-11-28 12:32:26 -05002258 flags);
2259 if (err < 0)
2260 break;
2261 if (err == 1) {
2262 err = 0;
2263 break;
2264 }
Eric Sandeen6873fa02008-10-07 00:46:36 -04002265 }
2266
Zheng Liu69eb33d2013-02-18 00:31:07 -05002267 block = es.es_lblk + es.es_len;
Eric Sandeen6873fa02008-10-07 00:46:36 -04002268 }
2269
2270 if (path) {
2271 ext4_ext_drop_refs(path);
2272 kfree(path);
2273 }
2274
2275 return err;
2276}
2277
Alex Tomasa86c6182006-10-11 01:21:03 -07002278/*
Randy Dunlapd0d856e2006-10-11 01:21:07 -07002279 * ext4_ext_put_gap_in_cache:
2280 * calculate boundaries of the gap that the requested block fits into
Alex Tomasa86c6182006-10-11 01:21:03 -07002281 * and cache this gap
2282 */
Avantika Mathur09b88252006-12-06 20:41:36 -08002283static void
Alex Tomasa86c6182006-10-11 01:21:03 -07002284ext4_ext_put_gap_in_cache(struct inode *inode, struct ext4_ext_path *path,
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05002285 ext4_lblk_t block)
Alex Tomasa86c6182006-10-11 01:21:03 -07002286{
2287 int depth = ext_depth(inode);
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05002288 unsigned long len;
2289 ext4_lblk_t lblock;
Alex Tomasa86c6182006-10-11 01:21:03 -07002290 struct ext4_extent *ex;
2291
2292 ex = path[depth].p_ext;
2293 if (ex == NULL) {
Zheng Liu69eb33d2013-02-18 00:31:07 -05002294 /*
2295 * there is no extent yet, so gap is [0;-] and we
2296 * don't cache it
2297 */
Alex Tomasa86c6182006-10-11 01:21:03 -07002298 ext_debug("cache gap(whole file):");
2299 } else if (block < le32_to_cpu(ex->ee_block)) {
2300 lblock = block;
2301 len = le32_to_cpu(ex->ee_block) - block;
Eric Sandeenbba90742008-01-28 23:58:27 -05002302 ext_debug("cache gap(before): %u [%u:%u]",
2303 block,
2304 le32_to_cpu(ex->ee_block),
2305 ext4_ext_get_actual_len(ex));
Zheng Liud100eef2013-02-18 00:29:59 -05002306 if (!ext4_find_delalloc_range(inode, lblock, lblock + len - 1))
2307 ext4_es_insert_extent(inode, lblock, len, ~0,
2308 EXTENT_STATUS_HOLE);
Alex Tomasa86c6182006-10-11 01:21:03 -07002309 } else if (block >= le32_to_cpu(ex->ee_block)
Amit Aroraa2df2a62007-07-17 21:42:41 -04002310 + ext4_ext_get_actual_len(ex)) {
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05002311 ext4_lblk_t next;
Dave Kleikamp8c55e202007-05-24 13:04:54 -04002312 lblock = le32_to_cpu(ex->ee_block)
Amit Aroraa2df2a62007-07-17 21:42:41 -04002313 + ext4_ext_get_actual_len(ex);
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05002314
2315 next = ext4_ext_next_allocated_block(path);
Eric Sandeenbba90742008-01-28 23:58:27 -05002316 ext_debug("cache gap(after): [%u:%u] %u",
2317 le32_to_cpu(ex->ee_block),
2318 ext4_ext_get_actual_len(ex),
2319 block);
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05002320 BUG_ON(next == lblock);
2321 len = next - lblock;
Zheng Liud100eef2013-02-18 00:29:59 -05002322 if (!ext4_find_delalloc_range(inode, lblock, lblock + len - 1))
2323 ext4_es_insert_extent(inode, lblock, len, ~0,
2324 EXTENT_STATUS_HOLE);
Alex Tomasa86c6182006-10-11 01:21:03 -07002325 } else {
2326 lblock = len = 0;
2327 BUG();
2328 }
2329
Eric Sandeenbba90742008-01-28 23:58:27 -05002330 ext_debug(" -> %u:%lu\n", lblock, len);
Alex Tomasa86c6182006-10-11 01:21:03 -07002331}
2332
2333/*
Randy Dunlapd0d856e2006-10-11 01:21:07 -07002334 * ext4_ext_rm_idx:
2335 * removes index from the index block.
Alex Tomasa86c6182006-10-11 01:21:03 -07002336 */
Aneesh Kumar K.V1d03ec92008-01-28 23:58:27 -05002337static int ext4_ext_rm_idx(handle_t *handle, struct inode *inode,
Forrest Liuc36575e2012-12-17 09:55:39 -05002338 struct ext4_ext_path *path, int depth)
Alex Tomasa86c6182006-10-11 01:21:03 -07002339{
Alex Tomasa86c6182006-10-11 01:21:03 -07002340 int err;
Alex Tomasf65e6fb2006-10-11 01:21:05 -07002341 ext4_fsblk_t leaf;
Alex Tomasa86c6182006-10-11 01:21:03 -07002342
2343 /* free index block */
Forrest Liuc36575e2012-12-17 09:55:39 -05002344 depth--;
2345 path = path + depth;
Theodore Ts'obf89d162010-10-27 21:30:14 -04002346 leaf = ext4_idx_pblock(path->p_idx);
Frank Mayhar273df552010-03-02 11:46:09 -05002347 if (unlikely(path->p_hdr->eh_entries == 0)) {
2348 EXT4_ERROR_INODE(inode, "path->p_hdr->eh_entries == 0");
2349 return -EIO;
2350 }
Avantika Mathur7e028972006-12-06 20:41:33 -08002351 err = ext4_ext_get_access(handle, inode, path);
2352 if (err)
Alex Tomasa86c6182006-10-11 01:21:03 -07002353 return err;
Robin Dong0e1147b2011-07-27 21:29:33 -04002354
2355 if (path->p_idx != EXT_LAST_INDEX(path->p_hdr)) {
2356 int len = EXT_LAST_INDEX(path->p_hdr) - path->p_idx;
2357 len *= sizeof(struct ext4_extent_idx);
2358 memmove(path->p_idx, path->p_idx + 1, len);
2359 }
2360
Marcin Slusarze8546d02008-04-17 10:38:59 -04002361 le16_add_cpu(&path->p_hdr->eh_entries, -1);
Avantika Mathur7e028972006-12-06 20:41:33 -08002362 err = ext4_ext_dirty(handle, inode, path);
2363 if (err)
Alex Tomasa86c6182006-10-11 01:21:03 -07002364 return err;
Mingming Cao2ae02102006-10-11 01:21:11 -07002365 ext_debug("index is empty, remove it, free block %llu\n", leaf);
Aditya Kalid8990242011-09-09 19:18:51 -04002366 trace_ext4_ext_rm_idx(inode, leaf);
2367
Peter Huewe7dc57612011-02-21 21:01:42 -05002368 ext4_free_blocks(handle, inode, NULL, leaf, 1,
Theodore Ts'oe6362602009-11-23 07:17:05 -05002369 EXT4_FREE_BLOCKS_METADATA | EXT4_FREE_BLOCKS_FORGET);
Forrest Liuc36575e2012-12-17 09:55:39 -05002370
2371 while (--depth >= 0) {
2372 if (path->p_idx != EXT_FIRST_INDEX(path->p_hdr))
2373 break;
2374 path--;
2375 err = ext4_ext_get_access(handle, inode, path);
2376 if (err)
2377 break;
2378 path->p_idx->ei_block = (path+1)->p_idx->ei_block;
2379 err = ext4_ext_dirty(handle, inode, path);
2380 if (err)
2381 break;
2382 }
Alex Tomasa86c6182006-10-11 01:21:03 -07002383 return err;
2384}
2385
2386/*
Mingming Caoee12b632008-08-19 22:16:05 -04002387 * ext4_ext_calc_credits_for_single_extent:
2388 * This routine returns max. credits that needed to insert an extent
2389 * to the extent tree.
2390 * When pass the actual path, the caller should calculate credits
2391 * under i_data_sem.
Alex Tomasa86c6182006-10-11 01:21:03 -07002392 */
Mingming Cao525f4ed2008-08-19 22:15:58 -04002393int ext4_ext_calc_credits_for_single_extent(struct inode *inode, int nrblocks,
Alex Tomasa86c6182006-10-11 01:21:03 -07002394 struct ext4_ext_path *path)
2395{
Alex Tomasa86c6182006-10-11 01:21:03 -07002396 if (path) {
Mingming Caoee12b632008-08-19 22:16:05 -04002397 int depth = ext_depth(inode);
Mingming Caof3bd1f32008-08-19 22:16:03 -04002398 int ret = 0;
Mingming Caoee12b632008-08-19 22:16:05 -04002399
Alex Tomasa86c6182006-10-11 01:21:03 -07002400 /* probably there is space in leaf? */
Alex Tomasa86c6182006-10-11 01:21:03 -07002401 if (le16_to_cpu(path[depth].p_hdr->eh_entries)
Mingming Caoee12b632008-08-19 22:16:05 -04002402 < le16_to_cpu(path[depth].p_hdr->eh_max)) {
2403
2404 /*
2405 * There are some space in the leaf tree, no
2406 * need to account for leaf block credit
2407 *
2408 * bitmaps and block group descriptor blocks
Tao Madf3ab172011-10-08 15:53:49 -04002409 * and other metadata blocks still need to be
Mingming Caoee12b632008-08-19 22:16:05 -04002410 * accounted.
2411 */
Mingming Cao525f4ed2008-08-19 22:15:58 -04002412 /* 1 bitmap, 1 block group descriptor */
Mingming Caoee12b632008-08-19 22:16:05 -04002413 ret = 2 + EXT4_META_TRANS_BLOCKS(inode->i_sb);
Aneesh Kumar K.V5887e982009-07-05 23:12:04 -04002414 return ret;
Mingming Caoee12b632008-08-19 22:16:05 -04002415 }
Alex Tomasa86c6182006-10-11 01:21:03 -07002416 }
2417
Mingming Cao525f4ed2008-08-19 22:15:58 -04002418 return ext4_chunk_trans_blocks(inode, nrblocks);
Mingming Caoee12b632008-08-19 22:16:05 -04002419}
Alex Tomasa86c6182006-10-11 01:21:03 -07002420
Mingming Caoee12b632008-08-19 22:16:05 -04002421/*
Jan Karafffb2732013-06-04 13:01:11 -04002422 * How many index/leaf blocks need to change/allocate to add @extents extents?
Mingming Caoee12b632008-08-19 22:16:05 -04002423 *
Jan Karafffb2732013-06-04 13:01:11 -04002424 * If we add a single extent, then in the worse case, each tree level
2425 * index/leaf need to be changed in case of the tree split.
Mingming Caoee12b632008-08-19 22:16:05 -04002426 *
Jan Karafffb2732013-06-04 13:01:11 -04002427 * If more extents are inserted, they could cause the whole tree split more
2428 * than once, but this is really rare.
Mingming Caoee12b632008-08-19 22:16:05 -04002429 */
Jan Karafffb2732013-06-04 13:01:11 -04002430int ext4_ext_index_trans_blocks(struct inode *inode, int extents)
Mingming Caoee12b632008-08-19 22:16:05 -04002431{
2432 int index;
Tao Maf19d5872012-12-10 14:05:51 -05002433 int depth;
2434
2435 /* If we are converting the inline data, only one is needed here. */
2436 if (ext4_has_inline_data(inode))
2437 return 1;
2438
2439 depth = ext_depth(inode);
Alex Tomasa86c6182006-10-11 01:21:03 -07002440
Jan Karafffb2732013-06-04 13:01:11 -04002441 if (extents <= 1)
Mingming Caoee12b632008-08-19 22:16:05 -04002442 index = depth * 2;
2443 else
2444 index = depth * 3;
Alex Tomasa86c6182006-10-11 01:21:03 -07002445
Mingming Caoee12b632008-08-19 22:16:05 -04002446 return index;
Alex Tomasa86c6182006-10-11 01:21:03 -07002447}
2448
Theodore Ts'o981250c2013-06-12 11:48:29 -04002449static inline int get_default_free_blocks_flags(struct inode *inode)
2450{
2451 if (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode))
2452 return EXT4_FREE_BLOCKS_METADATA | EXT4_FREE_BLOCKS_FORGET;
2453 else if (ext4_should_journal_data(inode))
2454 return EXT4_FREE_BLOCKS_FORGET;
2455 return 0;
2456}
2457
Alex Tomasa86c6182006-10-11 01:21:03 -07002458static int ext4_remove_blocks(handle_t *handle, struct inode *inode,
Theodore Ts'o0aa06002011-09-09 18:54:51 -04002459 struct ext4_extent *ex,
Lukas Czernerd23142c2013-05-27 23:33:35 -04002460 long long *partial_cluster,
Theodore Ts'o0aa06002011-09-09 18:54:51 -04002461 ext4_lblk_t from, ext4_lblk_t to)
Alex Tomasa86c6182006-10-11 01:21:03 -07002462{
Theodore Ts'o0aa06002011-09-09 18:54:51 -04002463 struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
Amit Aroraa2df2a62007-07-17 21:42:41 -04002464 unsigned short ee_len = ext4_ext_get_actual_len(ex);
Theodore Ts'o0aa06002011-09-09 18:54:51 -04002465 ext4_fsblk_t pblk;
Theodore Ts'o981250c2013-06-12 11:48:29 -04002466 int flags = get_default_free_blocks_flags(inode);
Andrey Sidorov18888cf2012-09-19 14:14:53 -04002467
Theodore Ts'o0aa06002011-09-09 18:54:51 -04002468 /*
2469 * For bigalloc file systems, we never free a partial cluster
2470 * at the beginning of the extent. Instead, we make a note
2471 * that we tried freeing the cluster, and check to see if we
2472 * need to free it on a subsequent call to ext4_remove_blocks,
2473 * or at the end of the ext4_truncate() operation.
2474 */
2475 flags |= EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER;
2476
Aditya Kalid8990242011-09-09 19:18:51 -04002477 trace_ext4_remove_blocks(inode, ex, from, to, *partial_cluster);
Theodore Ts'o0aa06002011-09-09 18:54:51 -04002478 /*
2479 * If we have a partial cluster, and it's different from the
2480 * cluster of the last block, we need to explicitly free the
2481 * partial cluster here.
2482 */
2483 pblk = ext4_ext_pblock(ex) + ee_len - 1;
Lukas Czernerd23142c2013-05-27 23:33:35 -04002484 if ((*partial_cluster > 0) &&
2485 (EXT4_B2C(sbi, pblk) != *partial_cluster)) {
Theodore Ts'o0aa06002011-09-09 18:54:51 -04002486 ext4_free_blocks(handle, inode, NULL,
2487 EXT4_C2B(sbi, *partial_cluster),
2488 sbi->s_cluster_ratio, flags);
2489 *partial_cluster = 0;
2490 }
2491
Alex Tomasa86c6182006-10-11 01:21:03 -07002492#ifdef EXTENTS_STATS
2493 {
2494 struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
Alex Tomasa86c6182006-10-11 01:21:03 -07002495 spin_lock(&sbi->s_ext_stats_lock);
2496 sbi->s_ext_blocks += ee_len;
2497 sbi->s_ext_extents++;
2498 if (ee_len < sbi->s_ext_min)
2499 sbi->s_ext_min = ee_len;
2500 if (ee_len > sbi->s_ext_max)
2501 sbi->s_ext_max = ee_len;
2502 if (ext_depth(inode) > sbi->s_depth_max)
2503 sbi->s_depth_max = ext_depth(inode);
2504 spin_unlock(&sbi->s_ext_stats_lock);
2505 }
2506#endif
2507 if (from >= le32_to_cpu(ex->ee_block)
Amit Aroraa2df2a62007-07-17 21:42:41 -04002508 && to == le32_to_cpu(ex->ee_block) + ee_len - 1) {
Alex Tomasa86c6182006-10-11 01:21:03 -07002509 /* tail removal */
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05002510 ext4_lblk_t num;
Lukas Czernerd23142c2013-05-27 23:33:35 -04002511 unsigned int unaligned;
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05002512
Amit Aroraa2df2a62007-07-17 21:42:41 -04002513 num = le32_to_cpu(ex->ee_block) + ee_len - from;
Theodore Ts'o0aa06002011-09-09 18:54:51 -04002514 pblk = ext4_ext_pblock(ex) + ee_len - num;
Lukas Czernerd23142c2013-05-27 23:33:35 -04002515 /*
2516 * Usually we want to free partial cluster at the end of the
2517 * extent, except for the situation when the cluster is still
2518 * used by any other extent (partial_cluster is negative).
2519 */
2520 if (*partial_cluster < 0 &&
2521 -(*partial_cluster) == EXT4_B2C(sbi, pblk + num - 1))
2522 flags |= EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER;
2523
2524 ext_debug("free last %u blocks starting %llu partial %lld\n",
2525 num, pblk, *partial_cluster);
Theodore Ts'o0aa06002011-09-09 18:54:51 -04002526 ext4_free_blocks(handle, inode, NULL, pblk, num, flags);
2527 /*
2528 * If the block range to be freed didn't start at the
2529 * beginning of a cluster, and we removed the entire
Lukas Czernerd23142c2013-05-27 23:33:35 -04002530 * extent and the cluster is not used by any other extent,
2531 * save the partial cluster here, since we might need to
2532 * delete if we determine that the truncate operation has
2533 * removed all of the blocks in the cluster.
2534 *
2535 * On the other hand, if we did not manage to free the whole
2536 * extent, we have to mark the cluster as used (store negative
2537 * cluster number in partial_cluster).
Theodore Ts'o0aa06002011-09-09 18:54:51 -04002538 */
Lukas Czernerd23142c2013-05-27 23:33:35 -04002539 unaligned = pblk & (sbi->s_cluster_ratio - 1);
2540 if (unaligned && (ee_len == num) &&
2541 (*partial_cluster != -((long long)EXT4_B2C(sbi, pblk))))
Theodore Ts'o0aa06002011-09-09 18:54:51 -04002542 *partial_cluster = EXT4_B2C(sbi, pblk);
Lukas Czernerd23142c2013-05-27 23:33:35 -04002543 else if (unaligned)
2544 *partial_cluster = -((long long)EXT4_B2C(sbi, pblk));
2545 else if (*partial_cluster > 0)
Theodore Ts'o0aa06002011-09-09 18:54:51 -04002546 *partial_cluster = 0;
Lukas Czerner78fb9cd2013-05-27 23:32:35 -04002547 } else
2548 ext4_error(sbi->s_sb, "strange request: removal(2) "
2549 "%u-%u from %u:%u\n",
2550 from, to, le32_to_cpu(ex->ee_block), ee_len);
Alex Tomasa86c6182006-10-11 01:21:03 -07002551 return 0;
2552}
2553
Allison Hendersond583fb82011-05-25 07:41:43 -04002554
2555/*
2556 * ext4_ext_rm_leaf() Removes the extents associated with the
2557 * blocks appearing between "start" and "end", and splits the extents
2558 * if "start" and "end" appear in the same extent
2559 *
2560 * @handle: The journal handle
2561 * @inode: The files inode
2562 * @path: The path to the leaf
Lukas Czernerd23142c2013-05-27 23:33:35 -04002563 * @partial_cluster: The cluster which we'll have to free if all extents
2564 * has been released from it. It gets negative in case
2565 * that the cluster is still used.
Allison Hendersond583fb82011-05-25 07:41:43 -04002566 * @start: The first block to remove
2567 * @end: The last block to remove
2568 */
Alex Tomasa86c6182006-10-11 01:21:03 -07002569static int
2570ext4_ext_rm_leaf(handle_t *handle, struct inode *inode,
Lukas Czernerd23142c2013-05-27 23:33:35 -04002571 struct ext4_ext_path *path,
2572 long long *partial_cluster,
Theodore Ts'o0aa06002011-09-09 18:54:51 -04002573 ext4_lblk_t start, ext4_lblk_t end)
Alex Tomasa86c6182006-10-11 01:21:03 -07002574{
Theodore Ts'o0aa06002011-09-09 18:54:51 -04002575 struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
Alex Tomasa86c6182006-10-11 01:21:03 -07002576 int err = 0, correct_index = 0;
2577 int depth = ext_depth(inode), credits;
2578 struct ext4_extent_header *eh;
Dmitry Monakhov750c9c42011-10-25 05:35:05 -04002579 ext4_lblk_t a, b;
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05002580 unsigned num;
2581 ext4_lblk_t ex_ee_block;
Alex Tomasa86c6182006-10-11 01:21:03 -07002582 unsigned short ex_ee_len;
Amit Aroraa2df2a62007-07-17 21:42:41 -04002583 unsigned uninitialized = 0;
Alex Tomasa86c6182006-10-11 01:21:03 -07002584 struct ext4_extent *ex;
Lukas Czernerd23142c2013-05-27 23:33:35 -04002585 ext4_fsblk_t pblk;
Alex Tomasa86c6182006-10-11 01:21:03 -07002586
Alex Tomasc29c0ae2007-07-18 09:19:09 -04002587 /* the header must be checked already in ext4_ext_remove_space() */
Lukas Czerner5f95d212012-03-19 23:03:19 -04002588 ext_debug("truncate since %u in leaf to %u\n", start, end);
Alex Tomasa86c6182006-10-11 01:21:03 -07002589 if (!path[depth].p_hdr)
2590 path[depth].p_hdr = ext_block_hdr(path[depth].p_bh);
2591 eh = path[depth].p_hdr;
Frank Mayhar273df552010-03-02 11:46:09 -05002592 if (unlikely(path[depth].p_hdr == NULL)) {
2593 EXT4_ERROR_INODE(inode, "path[%d].p_hdr == NULL", depth);
2594 return -EIO;
2595 }
Alex Tomasa86c6182006-10-11 01:21:03 -07002596 /* find where to start removing */
Ashish Sangwan6ae06ff2013-07-01 08:12:41 -04002597 ex = path[depth].p_ext;
2598 if (!ex)
2599 ex = EXT_LAST_EXTENT(eh);
Alex Tomasa86c6182006-10-11 01:21:03 -07002600
2601 ex_ee_block = le32_to_cpu(ex->ee_block);
Amit Aroraa2df2a62007-07-17 21:42:41 -04002602 ex_ee_len = ext4_ext_get_actual_len(ex);
Alex Tomasa86c6182006-10-11 01:21:03 -07002603
Aditya Kalid8990242011-09-09 19:18:51 -04002604 trace_ext4_ext_rm_leaf(inode, start, ex, *partial_cluster);
2605
Alex Tomasa86c6182006-10-11 01:21:03 -07002606 while (ex >= EXT_FIRST_EXTENT(eh) &&
2607 ex_ee_block + ex_ee_len > start) {
Aneesh Kumar K.Va41f2072009-06-10 14:22:55 -04002608
2609 if (ext4_ext_is_uninitialized(ex))
2610 uninitialized = 1;
2611 else
2612 uninitialized = 0;
2613
Mingming553f9002009-09-18 13:34:55 -04002614 ext_debug("remove ext %u:[%d]%d\n", ex_ee_block,
2615 uninitialized, ex_ee_len);
Alex Tomasa86c6182006-10-11 01:21:03 -07002616 path[depth].p_ext = ex;
2617
2618 a = ex_ee_block > start ? ex_ee_block : start;
Allison Hendersond583fb82011-05-25 07:41:43 -04002619 b = ex_ee_block+ex_ee_len - 1 < end ?
2620 ex_ee_block+ex_ee_len - 1 : end;
Alex Tomasa86c6182006-10-11 01:21:03 -07002621
2622 ext_debug(" border %u:%u\n", a, b);
2623
Allison Hendersond583fb82011-05-25 07:41:43 -04002624 /* If this extent is beyond the end of the hole, skip it */
Lukas Czerner5f95d212012-03-19 23:03:19 -04002625 if (end < ex_ee_block) {
Lukas Czernerd23142c2013-05-27 23:33:35 -04002626 /*
2627 * We're going to skip this extent and move to another,
2628 * so if this extent is not cluster aligned we have
2629 * to mark the current cluster as used to avoid
2630 * accidentally freeing it later on
2631 */
2632 pblk = ext4_ext_pblock(ex);
2633 if (pblk & (sbi->s_cluster_ratio - 1))
2634 *partial_cluster =
2635 -((long long)EXT4_B2C(sbi, pblk));
Allison Hendersond583fb82011-05-25 07:41:43 -04002636 ex--;
2637 ex_ee_block = le32_to_cpu(ex->ee_block);
2638 ex_ee_len = ext4_ext_get_actual_len(ex);
2639 continue;
Dmitry Monakhov750c9c42011-10-25 05:35:05 -04002640 } else if (b != ex_ee_block + ex_ee_len - 1) {
Lukas Czernerdc1841d2012-03-19 23:07:43 -04002641 EXT4_ERROR_INODE(inode,
2642 "can not handle truncate %u:%u "
2643 "on extent %u:%u",
2644 start, end, ex_ee_block,
2645 ex_ee_block + ex_ee_len - 1);
Dmitry Monakhov750c9c42011-10-25 05:35:05 -04002646 err = -EIO;
2647 goto out;
Alex Tomasa86c6182006-10-11 01:21:03 -07002648 } else if (a != ex_ee_block) {
2649 /* remove tail of the extent */
Dmitry Monakhov750c9c42011-10-25 05:35:05 -04002650 num = a - ex_ee_block;
Alex Tomasa86c6182006-10-11 01:21:03 -07002651 } else {
2652 /* remove whole extent: excellent! */
Alex Tomasa86c6182006-10-11 01:21:03 -07002653 num = 0;
Alex Tomasa86c6182006-10-11 01:21:03 -07002654 }
Theodore Ts'o34071da2008-08-01 21:59:19 -04002655 /*
2656 * 3 for leaf, sb, and inode plus 2 (bmap and group
2657 * descriptor) for each block group; assume two block
2658 * groups plus ex_ee_len/blocks_per_block_group for
2659 * the worst case
2660 */
2661 credits = 7 + 2*(ex_ee_len/EXT4_BLOCKS_PER_GROUP(inode->i_sb));
Alex Tomasa86c6182006-10-11 01:21:03 -07002662 if (ex == EXT_FIRST_EXTENT(eh)) {
2663 correct_index = 1;
2664 credits += (ext_depth(inode)) + 1;
2665 }
Dmitry Monakhov5aca07e2009-12-08 22:42:15 -05002666 credits += EXT4_MAXQUOTAS_TRANS_BLOCKS(inode->i_sb);
Alex Tomasa86c6182006-10-11 01:21:03 -07002667
Jan Kara487caee2009-08-17 22:17:20 -04002668 err = ext4_ext_truncate_extend_restart(handle, inode, credits);
Shen Feng9102e4f2008-07-11 19:27:31 -04002669 if (err)
Alex Tomasa86c6182006-10-11 01:21:03 -07002670 goto out;
Alex Tomasa86c6182006-10-11 01:21:03 -07002671
2672 err = ext4_ext_get_access(handle, inode, path + depth);
2673 if (err)
2674 goto out;
2675
Theodore Ts'o0aa06002011-09-09 18:54:51 -04002676 err = ext4_remove_blocks(handle, inode, ex, partial_cluster,
2677 a, b);
Alex Tomasa86c6182006-10-11 01:21:03 -07002678 if (err)
2679 goto out;
2680
Dmitry Monakhov750c9c42011-10-25 05:35:05 -04002681 if (num == 0)
Randy Dunlapd0d856e2006-10-11 01:21:07 -07002682 /* this extent is removed; mark slot entirely unused */
Alex Tomasf65e6fb2006-10-11 01:21:05 -07002683 ext4_ext_store_pblock(ex, 0);
Alex Tomasa86c6182006-10-11 01:21:03 -07002684
Alex Tomasa86c6182006-10-11 01:21:03 -07002685 ex->ee_len = cpu_to_le16(num);
Amit Arora749269f2007-07-18 09:02:56 -04002686 /*
2687 * Do not mark uninitialized if all the blocks in the
2688 * extent have been removed.
2689 */
2690 if (uninitialized && num)
Amit Aroraa2df2a62007-07-17 21:42:41 -04002691 ext4_ext_mark_uninitialized(ex);
Allison Hendersond583fb82011-05-25 07:41:43 -04002692 /*
2693 * If the extent was completely released,
2694 * we need to remove it from the leaf
2695 */
2696 if (num == 0) {
Lukas Czernerf17722f2011-06-06 00:05:17 -04002697 if (end != EXT_MAX_BLOCKS - 1) {
Allison Hendersond583fb82011-05-25 07:41:43 -04002698 /*
2699 * For hole punching, we need to scoot all the
2700 * extents up when an extent is removed so that
2701 * we dont have blank extents in the middle
2702 */
2703 memmove(ex, ex+1, (EXT_LAST_EXTENT(eh) - ex) *
2704 sizeof(struct ext4_extent));
2705
2706 /* Now get rid of the one at the end */
2707 memset(EXT_LAST_EXTENT(eh), 0,
2708 sizeof(struct ext4_extent));
2709 }
2710 le16_add_cpu(&eh->eh_entries, -1);
Lukas Czernerd23142c2013-05-27 23:33:35 -04002711 } else if (*partial_cluster > 0)
Theodore Ts'o0aa06002011-09-09 18:54:51 -04002712 *partial_cluster = 0;
Allison Hendersond583fb82011-05-25 07:41:43 -04002713
Dmitry Monakhov750c9c42011-10-25 05:35:05 -04002714 err = ext4_ext_dirty(handle, inode, path + depth);
2715 if (err)
2716 goto out;
2717
Yongqiang Yangbf52c6f2011-11-01 18:59:26 -04002718 ext_debug("new extent: %u:%u:%llu\n", ex_ee_block, num,
Theodore Ts'obf89d162010-10-27 21:30:14 -04002719 ext4_ext_pblock(ex));
Alex Tomasa86c6182006-10-11 01:21:03 -07002720 ex--;
2721 ex_ee_block = le32_to_cpu(ex->ee_block);
Amit Aroraa2df2a62007-07-17 21:42:41 -04002722 ex_ee_len = ext4_ext_get_actual_len(ex);
Alex Tomasa86c6182006-10-11 01:21:03 -07002723 }
2724
2725 if (correct_index && eh->eh_entries)
2726 err = ext4_ext_correct_indexes(handle, inode, path);
2727
Theodore Ts'o0aa06002011-09-09 18:54:51 -04002728 /*
Lukas Czernerd23142c2013-05-27 23:33:35 -04002729 * Free the partial cluster only if the current extent does not
2730 * reference it. Otherwise we might free used cluster.
Theodore Ts'o0aa06002011-09-09 18:54:51 -04002731 */
Lukas Czernerd23142c2013-05-27 23:33:35 -04002732 if (*partial_cluster > 0 &&
Theodore Ts'o0aa06002011-09-09 18:54:51 -04002733 (EXT4_B2C(sbi, ext4_ext_pblock(ex) + ex_ee_len - 1) !=
2734 *partial_cluster)) {
Theodore Ts'o981250c2013-06-12 11:48:29 -04002735 int flags = get_default_free_blocks_flags(inode);
Theodore Ts'o0aa06002011-09-09 18:54:51 -04002736
2737 ext4_free_blocks(handle, inode, NULL,
2738 EXT4_C2B(sbi, *partial_cluster),
2739 sbi->s_cluster_ratio, flags);
2740 *partial_cluster = 0;
2741 }
2742
Alex Tomasa86c6182006-10-11 01:21:03 -07002743 /* if this leaf is free, then we should
2744 * remove it from index block above */
2745 if (err == 0 && eh->eh_entries == 0 && path[depth].p_bh != NULL)
Forrest Liuc36575e2012-12-17 09:55:39 -05002746 err = ext4_ext_rm_idx(handle, inode, path, depth);
Alex Tomasa86c6182006-10-11 01:21:03 -07002747
2748out:
2749 return err;
2750}
2751
2752/*
Randy Dunlapd0d856e2006-10-11 01:21:07 -07002753 * ext4_ext_more_to_rm:
2754 * returns 1 if current index has to be freed (even partial)
Alex Tomasa86c6182006-10-11 01:21:03 -07002755 */
Avantika Mathur09b88252006-12-06 20:41:36 -08002756static int
Alex Tomasa86c6182006-10-11 01:21:03 -07002757ext4_ext_more_to_rm(struct ext4_ext_path *path)
2758{
2759 BUG_ON(path->p_idx == NULL);
2760
2761 if (path->p_idx < EXT_FIRST_INDEX(path->p_hdr))
2762 return 0;
2763
2764 /*
Randy Dunlapd0d856e2006-10-11 01:21:07 -07002765 * if truncate on deeper level happened, it wasn't partial,
Alex Tomasa86c6182006-10-11 01:21:03 -07002766 * so we have to consider current index for truncation
2767 */
2768 if (le16_to_cpu(path->p_hdr->eh_entries) == path->p_block)
2769 return 0;
2770 return 1;
2771}
2772
Theodore Ts'o26a4c0c2013-04-03 12:45:17 -04002773int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start,
2774 ext4_lblk_t end)
Alex Tomasa86c6182006-10-11 01:21:03 -07002775{
2776 struct super_block *sb = inode->i_sb;
2777 int depth = ext_depth(inode);
Ashish Sangwan968dee72012-07-22 22:49:08 -04002778 struct ext4_ext_path *path = NULL;
Lukas Czernerd23142c2013-05-27 23:33:35 -04002779 long long partial_cluster = 0;
Alex Tomasa86c6182006-10-11 01:21:03 -07002780 handle_t *handle;
Dmitry Monakhov6f2080e2012-09-30 23:03:50 -04002781 int i = 0, err = 0;
Alex Tomasa86c6182006-10-11 01:21:03 -07002782
Lukas Czerner5f95d212012-03-19 23:03:19 -04002783 ext_debug("truncate since %u to %u\n", start, end);
Alex Tomasa86c6182006-10-11 01:21:03 -07002784
2785 /* probably first extent we're gonna free will be last in block */
Theodore Ts'o9924a922013-02-08 21:59:22 -05002786 handle = ext4_journal_start(inode, EXT4_HT_TRUNCATE, depth + 1);
Alex Tomasa86c6182006-10-11 01:21:03 -07002787 if (IS_ERR(handle))
2788 return PTR_ERR(handle);
2789
Dmitry Monakhov0617b832010-05-17 01:00:00 -04002790again:
Lukas Czerner61801322013-05-27 23:32:35 -04002791 trace_ext4_ext_remove_space(inode, start, end, depth);
Aditya Kalid8990242011-09-09 19:18:51 -04002792
Alex Tomasa86c6182006-10-11 01:21:03 -07002793 /*
Lukas Czerner5f95d212012-03-19 23:03:19 -04002794 * Check if we are removing extents inside the extent tree. If that
2795 * is the case, we are going to punch a hole inside the extent tree
2796 * so we have to check whether we need to split the extent covering
2797 * the last block to remove so we can easily remove the part of it
2798 * in ext4_ext_rm_leaf().
2799 */
2800 if (end < EXT_MAX_BLOCKS - 1) {
2801 struct ext4_extent *ex;
2802 ext4_lblk_t ee_block;
2803
2804 /* find extent for this block */
Theodore Ts'o107a7bd2013-08-16 21:23:41 -04002805 path = ext4_ext_find_extent(inode, end, NULL, EXT4_EX_NOCACHE);
Lukas Czerner5f95d212012-03-19 23:03:19 -04002806 if (IS_ERR(path)) {
2807 ext4_journal_stop(handle);
2808 return PTR_ERR(path);
2809 }
2810 depth = ext_depth(inode);
Dmitry Monakhov6f2080e2012-09-30 23:03:50 -04002811 /* Leaf not may not exist only if inode has no blocks at all */
Lukas Czerner5f95d212012-03-19 23:03:19 -04002812 ex = path[depth].p_ext;
Ashish Sangwan968dee72012-07-22 22:49:08 -04002813 if (!ex) {
Dmitry Monakhov6f2080e2012-09-30 23:03:50 -04002814 if (depth) {
2815 EXT4_ERROR_INODE(inode,
2816 "path[%d].p_hdr == NULL",
2817 depth);
2818 err = -EIO;
2819 }
2820 goto out;
Ashish Sangwan968dee72012-07-22 22:49:08 -04002821 }
Lukas Czerner5f95d212012-03-19 23:03:19 -04002822
2823 ee_block = le32_to_cpu(ex->ee_block);
2824
2825 /*
2826 * See if the last block is inside the extent, if so split
2827 * the extent at 'end' block so we can easily remove the
2828 * tail of the first part of the split extent in
2829 * ext4_ext_rm_leaf().
2830 */
2831 if (end >= ee_block &&
2832 end < ee_block + ext4_ext_get_actual_len(ex) - 1) {
2833 int split_flag = 0;
2834
2835 if (ext4_ext_is_uninitialized(ex))
2836 split_flag = EXT4_EXT_MARK_UNINIT1 |
2837 EXT4_EXT_MARK_UNINIT2;
2838
2839 /*
2840 * Split the extent in two so that 'end' is the last
Lukas Czerner27dd4382013-04-09 22:11:22 -04002841 * block in the first new extent. Also we should not
2842 * fail removing space due to ENOSPC so try to use
2843 * reserved block if that happens.
Lukas Czerner5f95d212012-03-19 23:03:19 -04002844 */
2845 err = ext4_split_extent_at(handle, inode, path,
Lukas Czerner27dd4382013-04-09 22:11:22 -04002846 end + 1, split_flag,
Theodore Ts'o107a7bd2013-08-16 21:23:41 -04002847 EXT4_EX_NOCACHE |
Lukas Czerner27dd4382013-04-09 22:11:22 -04002848 EXT4_GET_BLOCKS_PRE_IO |
2849 EXT4_GET_BLOCKS_METADATA_NOFAIL);
Lukas Czerner5f95d212012-03-19 23:03:19 -04002850
2851 if (err < 0)
2852 goto out;
2853 }
Lukas Czerner5f95d212012-03-19 23:03:19 -04002854 }
Lukas Czerner5f95d212012-03-19 23:03:19 -04002855 /*
Randy Dunlapd0d856e2006-10-11 01:21:07 -07002856 * We start scanning from right side, freeing all the blocks
2857 * after i_size and walking into the tree depth-wise.
Alex Tomasa86c6182006-10-11 01:21:03 -07002858 */
Dmitry Monakhov0617b832010-05-17 01:00:00 -04002859 depth = ext_depth(inode);
Ashish Sangwan968dee72012-07-22 22:49:08 -04002860 if (path) {
2861 int k = i = depth;
2862 while (--k > 0)
2863 path[k].p_block =
2864 le16_to_cpu(path[k].p_hdr->eh_entries)+1;
2865 } else {
2866 path = kzalloc(sizeof(struct ext4_ext_path) * (depth + 1),
2867 GFP_NOFS);
2868 if (path == NULL) {
2869 ext4_journal_stop(handle);
2870 return -ENOMEM;
2871 }
2872 path[0].p_depth = depth;
2873 path[0].p_hdr = ext_inode_hdr(inode);
Theodore Ts'o89a4e482012-08-17 08:54:52 -04002874 i = 0;
Lukas Czerner5f95d212012-03-19 23:03:19 -04002875
Theodore Ts'oc3491792013-08-16 21:21:41 -04002876 if (ext4_ext_check(inode, path[0].p_hdr, depth, 0)) {
Ashish Sangwan968dee72012-07-22 22:49:08 -04002877 err = -EIO;
2878 goto out;
2879 }
Alex Tomasa86c6182006-10-11 01:21:03 -07002880 }
Ashish Sangwan968dee72012-07-22 22:49:08 -04002881 err = 0;
Alex Tomasa86c6182006-10-11 01:21:03 -07002882
2883 while (i >= 0 && err == 0) {
2884 if (i == depth) {
2885 /* this is leaf block */
Allison Hendersond583fb82011-05-25 07:41:43 -04002886 err = ext4_ext_rm_leaf(handle, inode, path,
Theodore Ts'o0aa06002011-09-09 18:54:51 -04002887 &partial_cluster, start,
Lukas Czerner5f95d212012-03-19 23:03:19 -04002888 end);
Randy Dunlapd0d856e2006-10-11 01:21:07 -07002889 /* root level has p_bh == NULL, brelse() eats this */
Alex Tomasa86c6182006-10-11 01:21:03 -07002890 brelse(path[i].p_bh);
2891 path[i].p_bh = NULL;
2892 i--;
2893 continue;
2894 }
2895
2896 /* this is index block */
2897 if (!path[i].p_hdr) {
2898 ext_debug("initialize header\n");
2899 path[i].p_hdr = ext_block_hdr(path[i].p_bh);
Alex Tomasa86c6182006-10-11 01:21:03 -07002900 }
2901
Alex Tomasa86c6182006-10-11 01:21:03 -07002902 if (!path[i].p_idx) {
Randy Dunlapd0d856e2006-10-11 01:21:07 -07002903 /* this level hasn't been touched yet */
Alex Tomasa86c6182006-10-11 01:21:03 -07002904 path[i].p_idx = EXT_LAST_INDEX(path[i].p_hdr);
2905 path[i].p_block = le16_to_cpu(path[i].p_hdr->eh_entries)+1;
2906 ext_debug("init index ptr: hdr 0x%p, num %d\n",
2907 path[i].p_hdr,
2908 le16_to_cpu(path[i].p_hdr->eh_entries));
2909 } else {
Randy Dunlapd0d856e2006-10-11 01:21:07 -07002910 /* we were already here, see at next index */
Alex Tomasa86c6182006-10-11 01:21:03 -07002911 path[i].p_idx--;
2912 }
2913
2914 ext_debug("level %d - index, first 0x%p, cur 0x%p\n",
2915 i, EXT_FIRST_INDEX(path[i].p_hdr),
2916 path[i].p_idx);
2917 if (ext4_ext_more_to_rm(path + i)) {
Alex Tomasc29c0ae2007-07-18 09:19:09 -04002918 struct buffer_head *bh;
Alex Tomasa86c6182006-10-11 01:21:03 -07002919 /* go to the next level */
Mingming Cao2ae02102006-10-11 01:21:11 -07002920 ext_debug("move to level %d (block %llu)\n",
Theodore Ts'obf89d162010-10-27 21:30:14 -04002921 i + 1, ext4_idx_pblock(path[i].p_idx));
Alex Tomasa86c6182006-10-11 01:21:03 -07002922 memset(path + i + 1, 0, sizeof(*path));
Theodore Ts'o7d7ea892013-08-16 21:20:41 -04002923 bh = read_extent_tree_block(inode,
Theodore Ts'o107a7bd2013-08-16 21:23:41 -04002924 ext4_idx_pblock(path[i].p_idx), depth - i - 1,
2925 EXT4_EX_NOCACHE);
Theodore Ts'o7d7ea892013-08-16 21:20:41 -04002926 if (IS_ERR(bh)) {
Alex Tomasa86c6182006-10-11 01:21:03 -07002927 /* should we reset i_size? */
Theodore Ts'o7d7ea892013-08-16 21:20:41 -04002928 err = PTR_ERR(bh);
Alex Tomasa86c6182006-10-11 01:21:03 -07002929 break;
2930 }
Theodore Ts'o76828c82013-07-15 12:27:47 -04002931 /* Yield here to deal with large extent trees.
2932 * Should be a no-op if we did IO above. */
2933 cond_resched();
Alex Tomasc29c0ae2007-07-18 09:19:09 -04002934 if (WARN_ON(i + 1 > depth)) {
2935 err = -EIO;
2936 break;
2937 }
Alex Tomasc29c0ae2007-07-18 09:19:09 -04002938 path[i + 1].p_bh = bh;
Alex Tomasa86c6182006-10-11 01:21:03 -07002939
Randy Dunlapd0d856e2006-10-11 01:21:07 -07002940 /* save actual number of indexes since this
2941 * number is changed at the next iteration */
Alex Tomasa86c6182006-10-11 01:21:03 -07002942 path[i].p_block = le16_to_cpu(path[i].p_hdr->eh_entries);
2943 i++;
2944 } else {
Randy Dunlapd0d856e2006-10-11 01:21:07 -07002945 /* we finished processing this index, go up */
Alex Tomasa86c6182006-10-11 01:21:03 -07002946 if (path[i].p_hdr->eh_entries == 0 && i > 0) {
Randy Dunlapd0d856e2006-10-11 01:21:07 -07002947 /* index is empty, remove it;
Alex Tomasa86c6182006-10-11 01:21:03 -07002948 * handle must be already prepared by the
2949 * truncatei_leaf() */
Forrest Liuc36575e2012-12-17 09:55:39 -05002950 err = ext4_ext_rm_idx(handle, inode, path, i);
Alex Tomasa86c6182006-10-11 01:21:03 -07002951 }
Randy Dunlapd0d856e2006-10-11 01:21:07 -07002952 /* root level has p_bh == NULL, brelse() eats this */
Alex Tomasa86c6182006-10-11 01:21:03 -07002953 brelse(path[i].p_bh);
2954 path[i].p_bh = NULL;
2955 i--;
2956 ext_debug("return to level %d\n", i);
2957 }
2958 }
2959
Lukas Czerner61801322013-05-27 23:32:35 -04002960 trace_ext4_ext_remove_space_done(inode, start, end, depth,
2961 partial_cluster, path->p_hdr->eh_entries);
Aditya Kalid8990242011-09-09 19:18:51 -04002962
Aditya Kali7b415bf2011-09-09 19:04:51 -04002963 /* If we still have something in the partial cluster and we have removed
2964 * even the first extent, then we should free the blocks in the partial
2965 * cluster as well. */
Lukas Czernerd23142c2013-05-27 23:33:35 -04002966 if (partial_cluster > 0 && path->p_hdr->eh_entries == 0) {
Theodore Ts'o981250c2013-06-12 11:48:29 -04002967 int flags = get_default_free_blocks_flags(inode);
Aditya Kali7b415bf2011-09-09 19:04:51 -04002968
2969 ext4_free_blocks(handle, inode, NULL,
2970 EXT4_C2B(EXT4_SB(sb), partial_cluster),
2971 EXT4_SB(sb)->s_cluster_ratio, flags);
2972 partial_cluster = 0;
2973 }
2974
Alex Tomasa86c6182006-10-11 01:21:03 -07002975 /* TODO: flexible tree reduction should be here */
2976 if (path->p_hdr->eh_entries == 0) {
2977 /*
Randy Dunlapd0d856e2006-10-11 01:21:07 -07002978 * truncate to zero freed all the tree,
2979 * so we need to correct eh_depth
Alex Tomasa86c6182006-10-11 01:21:03 -07002980 */
2981 err = ext4_ext_get_access(handle, inode, path);
2982 if (err == 0) {
2983 ext_inode_hdr(inode)->eh_depth = 0;
2984 ext_inode_hdr(inode)->eh_max =
Theodore Ts'o55ad63b2009-08-28 10:40:33 -04002985 cpu_to_le16(ext4_ext_space_root(inode, 0));
Alex Tomasa86c6182006-10-11 01:21:03 -07002986 err = ext4_ext_dirty(handle, inode, path);
2987 }
2988 }
2989out:
Alex Tomasa86c6182006-10-11 01:21:03 -07002990 ext4_ext_drop_refs(path);
2991 kfree(path);
Ashish Sangwan968dee72012-07-22 22:49:08 -04002992 if (err == -EAGAIN) {
2993 path = NULL;
Dmitry Monakhov0617b832010-05-17 01:00:00 -04002994 goto again;
Ashish Sangwan968dee72012-07-22 22:49:08 -04002995 }
Alex Tomasa86c6182006-10-11 01:21:03 -07002996 ext4_journal_stop(handle);
2997
2998 return err;
2999}
3000
3001/*
3002 * called at mount time
3003 */
3004void ext4_ext_init(struct super_block *sb)
3005{
3006 /*
3007 * possible initialization would be here
3008 */
3009
Theodore Ts'o83982b62009-01-06 14:53:16 -05003010 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS)) {
Theodore Ts'o90576c02009-09-29 15:51:30 -04003011#if defined(AGGRESSIVE_TEST) || defined(CHECK_BINSEARCH) || defined(EXTENTS_STATS)
Theodore Ts'o92b97812012-03-19 23:41:49 -04003012 printk(KERN_INFO "EXT4-fs: file extents enabled"
Robert P. J. Daybbf2f9f2007-02-17 19:20:16 +01003013#ifdef AGGRESSIVE_TEST
Theodore Ts'o92b97812012-03-19 23:41:49 -04003014 ", aggressive tests"
Alex Tomasa86c6182006-10-11 01:21:03 -07003015#endif
3016#ifdef CHECK_BINSEARCH
Theodore Ts'o92b97812012-03-19 23:41:49 -04003017 ", check binsearch"
Alex Tomasa86c6182006-10-11 01:21:03 -07003018#endif
3019#ifdef EXTENTS_STATS
Theodore Ts'o92b97812012-03-19 23:41:49 -04003020 ", stats"
Alex Tomasa86c6182006-10-11 01:21:03 -07003021#endif
Theodore Ts'o92b97812012-03-19 23:41:49 -04003022 "\n");
Theodore Ts'o90576c02009-09-29 15:51:30 -04003023#endif
Alex Tomasa86c6182006-10-11 01:21:03 -07003024#ifdef EXTENTS_STATS
3025 spin_lock_init(&EXT4_SB(sb)->s_ext_stats_lock);
3026 EXT4_SB(sb)->s_ext_min = 1 << 30;
3027 EXT4_SB(sb)->s_ext_max = 0;
3028#endif
3029 }
3030}
3031
3032/*
3033 * called at umount time
3034 */
3035void ext4_ext_release(struct super_block *sb)
3036{
Theodore Ts'o83982b62009-01-06 14:53:16 -05003037 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS))
Alex Tomasa86c6182006-10-11 01:21:03 -07003038 return;
3039
3040#ifdef EXTENTS_STATS
3041 if (EXT4_SB(sb)->s_ext_blocks && EXT4_SB(sb)->s_ext_extents) {
3042 struct ext4_sb_info *sbi = EXT4_SB(sb);
3043 printk(KERN_ERR "EXT4-fs: %lu blocks in %lu extents (%lu ave)\n",
3044 sbi->s_ext_blocks, sbi->s_ext_extents,
3045 sbi->s_ext_blocks / sbi->s_ext_extents);
3046 printk(KERN_ERR "EXT4-fs: extents: %lu min, %lu max, max depth %lu\n",
3047 sbi->s_ext_min, sbi->s_ext_max, sbi->s_depth_max);
3048 }
3049#endif
3050}
3051
Aneesh Kumar K.V093a0882008-04-29 08:11:12 -04003052/* FIXME!! we need to try to merge to left or right after zero-out */
3053static int ext4_ext_zeroout(struct inode *inode, struct ext4_extent *ex)
3054{
Lukas Czerner24075182010-10-27 21:30:06 -04003055 ext4_fsblk_t ee_pblock;
3056 unsigned int ee_len;
Jing Zhangb7203032010-05-12 00:00:00 -04003057 int ret;
Aneesh Kumar K.V093a0882008-04-29 08:11:12 -04003058
Aneesh Kumar K.V093a0882008-04-29 08:11:12 -04003059 ee_len = ext4_ext_get_actual_len(ex);
Theodore Ts'obf89d162010-10-27 21:30:14 -04003060 ee_pblock = ext4_ext_pblock(ex);
Aneesh Kumar K.V093a0882008-04-29 08:11:12 -04003061
Theodore Ts'oa107e5a2010-10-27 23:44:47 -04003062 ret = sb_issue_zeroout(inode->i_sb, ee_pblock, ee_len, GFP_NOFS);
Lukas Czerner24075182010-10-27 21:30:06 -04003063 if (ret > 0)
3064 ret = 0;
Aneesh Kumar K.V093a0882008-04-29 08:11:12 -04003065
Lukas Czerner24075182010-10-27 21:30:06 -04003066 return ret;
Aneesh Kumar K.V093a0882008-04-29 08:11:12 -04003067}
3068
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003069/*
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003070 * ext4_split_extent_at() splits an extent at given block.
3071 *
3072 * @handle: the journal handle
3073 * @inode: the file inode
3074 * @path: the path to the extent
3075 * @split: the logical block where the extent is splitted.
3076 * @split_flags: indicates if the extent could be zeroout if split fails, and
3077 * the states(init or uninit) of new extents.
3078 * @flags: flags used to insert new extent to extent tree.
3079 *
3080 *
3081 * Splits extent [a, b] into two extents [a, @split) and [@split, b], states
3082 * of which are deterimined by split_flag.
3083 *
3084 * There are two cases:
3085 * a> the extent are splitted into two extent.
3086 * b> split is not needed, and just mark the extent.
3087 *
3088 * return 0 on success.
3089 */
3090static int ext4_split_extent_at(handle_t *handle,
3091 struct inode *inode,
3092 struct ext4_ext_path *path,
3093 ext4_lblk_t split,
3094 int split_flag,
3095 int flags)
3096{
3097 ext4_fsblk_t newblock;
3098 ext4_lblk_t ee_block;
Zheng Liuadb23552013-03-10 21:13:05 -04003099 struct ext4_extent *ex, newex, orig_ex, zero_ex;
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003100 struct ext4_extent *ex2 = NULL;
3101 unsigned int ee_len, depth;
3102 int err = 0;
3103
Dmitry Monakhovdee1f972012-10-10 01:04:58 -04003104 BUG_ON((split_flag & (EXT4_EXT_DATA_VALID1 | EXT4_EXT_DATA_VALID2)) ==
3105 (EXT4_EXT_DATA_VALID1 | EXT4_EXT_DATA_VALID2));
3106
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003107 ext_debug("ext4_split_extents_at: inode %lu, logical"
3108 "block %llu\n", inode->i_ino, (unsigned long long)split);
3109
3110 ext4_ext_show_leaf(inode, path);
3111
3112 depth = ext_depth(inode);
3113 ex = path[depth].p_ext;
3114 ee_block = le32_to_cpu(ex->ee_block);
3115 ee_len = ext4_ext_get_actual_len(ex);
3116 newblock = split - ee_block + ext4_ext_pblock(ex);
3117
3118 BUG_ON(split < ee_block || split >= (ee_block + ee_len));
Dmitry Monakhov357b66f2013-03-04 00:34:34 -05003119 BUG_ON(!ext4_ext_is_uninitialized(ex) &&
3120 split_flag & (EXT4_EXT_MAY_ZEROOUT |
3121 EXT4_EXT_MARK_UNINIT1 |
3122 EXT4_EXT_MARK_UNINIT2));
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003123
3124 err = ext4_ext_get_access(handle, inode, path + depth);
3125 if (err)
3126 goto out;
3127
3128 if (split == ee_block) {
3129 /*
3130 * case b: block @split is the block that the extent begins with
3131 * then we just change the state of the extent, and splitting
3132 * is not needed.
3133 */
3134 if (split_flag & EXT4_EXT_MARK_UNINIT2)
3135 ext4_ext_mark_uninitialized(ex);
3136 else
3137 ext4_ext_mark_initialized(ex);
3138
3139 if (!(flags & EXT4_GET_BLOCKS_PRE_IO))
Theodore Ts'oecb94f52012-08-17 09:44:17 -04003140 ext4_ext_try_to_merge(handle, inode, path, ex);
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003141
Theodore Ts'oecb94f52012-08-17 09:44:17 -04003142 err = ext4_ext_dirty(handle, inode, path + path->p_depth);
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003143 goto out;
3144 }
3145
3146 /* case a */
3147 memcpy(&orig_ex, ex, sizeof(orig_ex));
3148 ex->ee_len = cpu_to_le16(split - ee_block);
3149 if (split_flag & EXT4_EXT_MARK_UNINIT1)
3150 ext4_ext_mark_uninitialized(ex);
3151
3152 /*
3153 * path may lead to new leaf, not to original leaf any more
3154 * after ext4_ext_insert_extent() returns,
3155 */
3156 err = ext4_ext_dirty(handle, inode, path + depth);
3157 if (err)
3158 goto fix_extent_len;
3159
3160 ex2 = &newex;
3161 ex2->ee_block = cpu_to_le32(split);
3162 ex2->ee_len = cpu_to_le16(ee_len - (split - ee_block));
3163 ext4_ext_store_pblock(ex2, newblock);
3164 if (split_flag & EXT4_EXT_MARK_UNINIT2)
3165 ext4_ext_mark_uninitialized(ex2);
3166
3167 err = ext4_ext_insert_extent(handle, inode, path, &newex, flags);
3168 if (err == -ENOSPC && (EXT4_EXT_MAY_ZEROOUT & split_flag)) {
Dmitry Monakhovdee1f972012-10-10 01:04:58 -04003169 if (split_flag & (EXT4_EXT_DATA_VALID1|EXT4_EXT_DATA_VALID2)) {
Zheng Liuadb23552013-03-10 21:13:05 -04003170 if (split_flag & EXT4_EXT_DATA_VALID1) {
Dmitry Monakhovdee1f972012-10-10 01:04:58 -04003171 err = ext4_ext_zeroout(inode, ex2);
Zheng Liuadb23552013-03-10 21:13:05 -04003172 zero_ex.ee_block = ex2->ee_block;
Zheng Liu8cde7ad2013-04-03 12:27:18 -04003173 zero_ex.ee_len = cpu_to_le16(
3174 ext4_ext_get_actual_len(ex2));
Zheng Liuadb23552013-03-10 21:13:05 -04003175 ext4_ext_store_pblock(&zero_ex,
3176 ext4_ext_pblock(ex2));
3177 } else {
Dmitry Monakhovdee1f972012-10-10 01:04:58 -04003178 err = ext4_ext_zeroout(inode, ex);
Zheng Liuadb23552013-03-10 21:13:05 -04003179 zero_ex.ee_block = ex->ee_block;
Zheng Liu8cde7ad2013-04-03 12:27:18 -04003180 zero_ex.ee_len = cpu_to_le16(
3181 ext4_ext_get_actual_len(ex));
Zheng Liuadb23552013-03-10 21:13:05 -04003182 ext4_ext_store_pblock(&zero_ex,
3183 ext4_ext_pblock(ex));
3184 }
3185 } else {
Dmitry Monakhovdee1f972012-10-10 01:04:58 -04003186 err = ext4_ext_zeroout(inode, &orig_ex);
Zheng Liuadb23552013-03-10 21:13:05 -04003187 zero_ex.ee_block = orig_ex.ee_block;
Zheng Liu8cde7ad2013-04-03 12:27:18 -04003188 zero_ex.ee_len = cpu_to_le16(
3189 ext4_ext_get_actual_len(&orig_ex));
Zheng Liuadb23552013-03-10 21:13:05 -04003190 ext4_ext_store_pblock(&zero_ex,
3191 ext4_ext_pblock(&orig_ex));
3192 }
Dmitry Monakhovdee1f972012-10-10 01:04:58 -04003193
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003194 if (err)
3195 goto fix_extent_len;
3196 /* update the extent length and mark as initialized */
Al Viroaf1584f2012-04-12 20:32:25 -04003197 ex->ee_len = cpu_to_le16(ee_len);
Theodore Ts'oecb94f52012-08-17 09:44:17 -04003198 ext4_ext_try_to_merge(handle, inode, path, ex);
3199 err = ext4_ext_dirty(handle, inode, path + path->p_depth);
Zheng Liuadb23552013-03-10 21:13:05 -04003200 if (err)
3201 goto fix_extent_len;
3202
3203 /* update extent status tree */
3204 err = ext4_es_zeroout(inode, &zero_ex);
3205
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003206 goto out;
3207 } else if (err)
3208 goto fix_extent_len;
3209
3210out:
3211 ext4_ext_show_leaf(inode, path);
3212 return err;
3213
3214fix_extent_len:
3215 ex->ee_len = orig_ex.ee_len;
3216 ext4_ext_dirty(handle, inode, path + depth);
3217 return err;
3218}
3219
3220/*
3221 * ext4_split_extents() splits an extent and mark extent which is covered
3222 * by @map as split_flags indicates
3223 *
3224 * It may result in splitting the extent into multiple extents (upto three)
3225 * There are three possibilities:
3226 * a> There is no split required
3227 * b> Splits in two extents: Split is happening at either end of the extent
3228 * c> Splits in three extents: Somone is splitting in middle of the extent
3229 *
3230 */
3231static int ext4_split_extent(handle_t *handle,
3232 struct inode *inode,
3233 struct ext4_ext_path *path,
3234 struct ext4_map_blocks *map,
3235 int split_flag,
3236 int flags)
3237{
3238 ext4_lblk_t ee_block;
3239 struct ext4_extent *ex;
3240 unsigned int ee_len, depth;
3241 int err = 0;
3242 int uninitialized;
3243 int split_flag1, flags1;
Zheng Liu3a225672013-03-10 21:20:23 -04003244 int allocated = map->m_len;
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003245
3246 depth = ext_depth(inode);
3247 ex = path[depth].p_ext;
3248 ee_block = le32_to_cpu(ex->ee_block);
3249 ee_len = ext4_ext_get_actual_len(ex);
3250 uninitialized = ext4_ext_is_uninitialized(ex);
3251
3252 if (map->m_lblk + map->m_len < ee_block + ee_len) {
Dmitry Monakhovdee1f972012-10-10 01:04:58 -04003253 split_flag1 = split_flag & EXT4_EXT_MAY_ZEROOUT;
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003254 flags1 = flags | EXT4_GET_BLOCKS_PRE_IO;
3255 if (uninitialized)
3256 split_flag1 |= EXT4_EXT_MARK_UNINIT1 |
3257 EXT4_EXT_MARK_UNINIT2;
Dmitry Monakhovdee1f972012-10-10 01:04:58 -04003258 if (split_flag & EXT4_EXT_DATA_VALID2)
3259 split_flag1 |= EXT4_EXT_DATA_VALID1;
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003260 err = ext4_split_extent_at(handle, inode, path,
3261 map->m_lblk + map->m_len, split_flag1, flags1);
Yongqiang Yang93917412011-05-22 20:49:12 -04003262 if (err)
3263 goto out;
Zheng Liu3a225672013-03-10 21:20:23 -04003264 } else {
3265 allocated = ee_len - (map->m_lblk - ee_block);
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003266 }
Dmitry Monakhov357b66f2013-03-04 00:34:34 -05003267 /*
3268 * Update path is required because previous ext4_split_extent_at() may
3269 * result in split of original leaf or extent zeroout.
3270 */
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003271 ext4_ext_drop_refs(path);
Theodore Ts'o107a7bd2013-08-16 21:23:41 -04003272 path = ext4_ext_find_extent(inode, map->m_lblk, path, 0);
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003273 if (IS_ERR(path))
3274 return PTR_ERR(path);
Dmitry Monakhov357b66f2013-03-04 00:34:34 -05003275 depth = ext_depth(inode);
3276 ex = path[depth].p_ext;
3277 uninitialized = ext4_ext_is_uninitialized(ex);
3278 split_flag1 = 0;
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003279
3280 if (map->m_lblk >= ee_block) {
Dmitry Monakhov357b66f2013-03-04 00:34:34 -05003281 split_flag1 = split_flag & EXT4_EXT_DATA_VALID2;
3282 if (uninitialized) {
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003283 split_flag1 |= EXT4_EXT_MARK_UNINIT1;
Dmitry Monakhov357b66f2013-03-04 00:34:34 -05003284 split_flag1 |= split_flag & (EXT4_EXT_MAY_ZEROOUT |
3285 EXT4_EXT_MARK_UNINIT2);
3286 }
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003287 err = ext4_split_extent_at(handle, inode, path,
3288 map->m_lblk, split_flag1, flags);
3289 if (err)
3290 goto out;
3291 }
3292
3293 ext4_ext_show_leaf(inode, path);
3294out:
Zheng Liu3a225672013-03-10 21:20:23 -04003295 return err ? err : allocated;
Yongqiang Yang47ea3bb2011-05-03 12:23:07 -04003296}
3297
Amit Arora56055d32007-07-17 21:42:38 -04003298/*
Theodore Ts'oe35fd662010-05-16 19:00:00 -04003299 * This function is called by ext4_ext_map_blocks() if someone tries to write
Amit Arora56055d32007-07-17 21:42:38 -04003300 * to an uninitialized extent. It may result in splitting the uninitialized
Lucas De Marchi25985ed2011-03-30 22:57:33 -03003301 * extent into multiple extents (up to three - one initialized and two
Amit Arora56055d32007-07-17 21:42:38 -04003302 * uninitialized).
3303 * There are three possibilities:
3304 * a> There is no split required: Entire extent should be initialized
3305 * b> Splits in two extents: Write is happening at either end of the extent
3306 * c> Splits in three extents: Somone is writing in middle of the extent
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003307 *
3308 * Pre-conditions:
3309 * - The extent pointed to by 'path' is uninitialized.
3310 * - The extent pointed to by 'path' contains a superset
3311 * of the logical span [map->m_lblk, map->m_lblk + map->m_len).
3312 *
3313 * Post-conditions on success:
3314 * - the returned value is the number of blocks beyond map->l_lblk
3315 * that are allocated and initialized.
3316 * It is guaranteed to be >= map->m_len.
Amit Arora56055d32007-07-17 21:42:38 -04003317 */
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05003318static int ext4_ext_convert_to_initialized(handle_t *handle,
Theodore Ts'oe35fd662010-05-16 19:00:00 -04003319 struct inode *inode,
3320 struct ext4_map_blocks *map,
Lukas Czerner27dd4382013-04-09 22:11:22 -04003321 struct ext4_ext_path *path,
3322 int flags)
Amit Arora56055d32007-07-17 21:42:38 -04003323{
Zheng Liu67a5da52012-08-17 09:54:17 -04003324 struct ext4_sb_info *sbi;
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003325 struct ext4_extent_header *eh;
Yongqiang Yang667eff32011-05-03 12:25:07 -04003326 struct ext4_map_blocks split_map;
3327 struct ext4_extent zero_ex;
Lukas Czernerbc2d9db2013-04-03 23:33:27 -04003328 struct ext4_extent *ex, *abut_ex;
Dmitry Monakhov21ca0872010-05-16 06:00:00 -04003329 ext4_lblk_t ee_block, eof_block;
Lukas Czernerbc2d9db2013-04-03 23:33:27 -04003330 unsigned int ee_len, depth, map_len = map->m_len;
3331 int allocated = 0, max_zeroout = 0;
Amit Arora56055d32007-07-17 21:42:38 -04003332 int err = 0;
Yongqiang Yang667eff32011-05-03 12:25:07 -04003333 int split_flag = 0;
Dmitry Monakhov21ca0872010-05-16 06:00:00 -04003334
3335 ext_debug("ext4_ext_convert_to_initialized: inode %lu, logical"
3336 "block %llu, max_blocks %u\n", inode->i_ino,
Lukas Czernerbc2d9db2013-04-03 23:33:27 -04003337 (unsigned long long)map->m_lblk, map_len);
Dmitry Monakhov21ca0872010-05-16 06:00:00 -04003338
Zheng Liu67a5da52012-08-17 09:54:17 -04003339 sbi = EXT4_SB(inode->i_sb);
Dmitry Monakhov21ca0872010-05-16 06:00:00 -04003340 eof_block = (inode->i_size + inode->i_sb->s_blocksize - 1) >>
3341 inode->i_sb->s_blocksize_bits;
Lukas Czernerbc2d9db2013-04-03 23:33:27 -04003342 if (eof_block < map->m_lblk + map_len)
3343 eof_block = map->m_lblk + map_len;
Amit Arora56055d32007-07-17 21:42:38 -04003344
3345 depth = ext_depth(inode);
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003346 eh = path[depth].p_hdr;
Amit Arora56055d32007-07-17 21:42:38 -04003347 ex = path[depth].p_ext;
3348 ee_block = le32_to_cpu(ex->ee_block);
3349 ee_len = ext4_ext_get_actual_len(ex);
Zheng Liuadb23552013-03-10 21:13:05 -04003350 zero_ex.ee_len = 0;
Dmitry Monakhov21ca0872010-05-16 06:00:00 -04003351
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003352 trace_ext4_ext_convert_to_initialized_enter(inode, map, ex);
3353
3354 /* Pre-conditions */
3355 BUG_ON(!ext4_ext_is_uninitialized(ex));
3356 BUG_ON(!in_range(map->m_lblk, ee_block, ee_len));
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003357
3358 /*
3359 * Attempt to transfer newly initialized blocks from the currently
Lukas Czernerbc2d9db2013-04-03 23:33:27 -04003360 * uninitialized extent to its neighbor. This is much cheaper
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003361 * than an insertion followed by a merge as those involve costly
Lukas Czernerbc2d9db2013-04-03 23:33:27 -04003362 * memmove() calls. Transferring to the left is the common case in
3363 * steady state for workloads doing fallocate(FALLOC_FL_KEEP_SIZE)
3364 * followed by append writes.
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003365 *
3366 * Limitations of the current logic:
Lukas Czernerbc2d9db2013-04-03 23:33:27 -04003367 * - L1: we do not deal with writes covering the whole extent.
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003368 * This would require removing the extent if the transfer
3369 * is possible.
Lukas Czernerbc2d9db2013-04-03 23:33:27 -04003370 * - L2: we only attempt to merge with an extent stored in the
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003371 * same extent tree node.
3372 */
Lukas Czernerbc2d9db2013-04-03 23:33:27 -04003373 if ((map->m_lblk == ee_block) &&
3374 /* See if we can merge left */
3375 (map_len < ee_len) && /*L1*/
3376 (ex > EXT_FIRST_EXTENT(eh))) { /*L2*/
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003377 ext4_lblk_t prev_lblk;
3378 ext4_fsblk_t prev_pblk, ee_pblk;
Lukas Czernerbc2d9db2013-04-03 23:33:27 -04003379 unsigned int prev_len;
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003380
Lukas Czernerbc2d9db2013-04-03 23:33:27 -04003381 abut_ex = ex - 1;
3382 prev_lblk = le32_to_cpu(abut_ex->ee_block);
3383 prev_len = ext4_ext_get_actual_len(abut_ex);
3384 prev_pblk = ext4_ext_pblock(abut_ex);
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003385 ee_pblk = ext4_ext_pblock(ex);
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003386
3387 /*
Lukas Czernerbc2d9db2013-04-03 23:33:27 -04003388 * A transfer of blocks from 'ex' to 'abut_ex' is allowed
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003389 * upon those conditions:
Lukas Czernerbc2d9db2013-04-03 23:33:27 -04003390 * - C1: abut_ex is initialized,
3391 * - C2: abut_ex is logically abutting ex,
3392 * - C3: abut_ex is physically abutting ex,
3393 * - C4: abut_ex can receive the additional blocks without
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003394 * overflowing the (initialized) length limit.
3395 */
Lukas Czernerbc2d9db2013-04-03 23:33:27 -04003396 if ((!ext4_ext_is_uninitialized(abut_ex)) && /*C1*/
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003397 ((prev_lblk + prev_len) == ee_block) && /*C2*/
3398 ((prev_pblk + prev_len) == ee_pblk) && /*C3*/
Lukas Czernerbc2d9db2013-04-03 23:33:27 -04003399 (prev_len < (EXT_INIT_MAX_LEN - map_len))) { /*C4*/
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003400 err = ext4_ext_get_access(handle, inode, path + depth);
3401 if (err)
3402 goto out;
3403
3404 trace_ext4_ext_convert_to_initialized_fastpath(inode,
Lukas Czernerbc2d9db2013-04-03 23:33:27 -04003405 map, ex, abut_ex);
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003406
Lukas Czernerbc2d9db2013-04-03 23:33:27 -04003407 /* Shift the start of ex by 'map_len' blocks */
3408 ex->ee_block = cpu_to_le32(ee_block + map_len);
3409 ext4_ext_store_pblock(ex, ee_pblk + map_len);
3410 ex->ee_len = cpu_to_le16(ee_len - map_len);
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003411 ext4_ext_mark_uninitialized(ex); /* Restore the flag */
3412
Lukas Czernerbc2d9db2013-04-03 23:33:27 -04003413 /* Extend abut_ex by 'map_len' blocks */
3414 abut_ex->ee_len = cpu_to_le16(prev_len + map_len);
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003415
3416 /* Result: number of initialized blocks past m_lblk */
Lukas Czernerbc2d9db2013-04-03 23:33:27 -04003417 allocated = map_len;
3418 }
3419 } else if (((map->m_lblk + map_len) == (ee_block + ee_len)) &&
3420 (map_len < ee_len) && /*L1*/
3421 ex < EXT_LAST_EXTENT(eh)) { /*L2*/
3422 /* See if we can merge right */
3423 ext4_lblk_t next_lblk;
3424 ext4_fsblk_t next_pblk, ee_pblk;
3425 unsigned int next_len;
3426
3427 abut_ex = ex + 1;
3428 next_lblk = le32_to_cpu(abut_ex->ee_block);
3429 next_len = ext4_ext_get_actual_len(abut_ex);
3430 next_pblk = ext4_ext_pblock(abut_ex);
3431 ee_pblk = ext4_ext_pblock(ex);
3432
3433 /*
3434 * A transfer of blocks from 'ex' to 'abut_ex' is allowed
3435 * upon those conditions:
3436 * - C1: abut_ex is initialized,
3437 * - C2: abut_ex is logically abutting ex,
3438 * - C3: abut_ex is physically abutting ex,
3439 * - C4: abut_ex can receive the additional blocks without
3440 * overflowing the (initialized) length limit.
3441 */
3442 if ((!ext4_ext_is_uninitialized(abut_ex)) && /*C1*/
3443 ((map->m_lblk + map_len) == next_lblk) && /*C2*/
3444 ((ee_pblk + ee_len) == next_pblk) && /*C3*/
3445 (next_len < (EXT_INIT_MAX_LEN - map_len))) { /*C4*/
3446 err = ext4_ext_get_access(handle, inode, path + depth);
3447 if (err)
3448 goto out;
3449
3450 trace_ext4_ext_convert_to_initialized_fastpath(inode,
3451 map, ex, abut_ex);
3452
3453 /* Shift the start of abut_ex by 'map_len' blocks */
3454 abut_ex->ee_block = cpu_to_le32(next_lblk - map_len);
3455 ext4_ext_store_pblock(abut_ex, next_pblk - map_len);
3456 ex->ee_len = cpu_to_le16(ee_len - map_len);
3457 ext4_ext_mark_uninitialized(ex); /* Restore the flag */
3458
3459 /* Extend abut_ex by 'map_len' blocks */
3460 abut_ex->ee_len = cpu_to_le16(next_len + map_len);
3461
3462 /* Result: number of initialized blocks past m_lblk */
3463 allocated = map_len;
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003464 }
3465 }
Lukas Czernerbc2d9db2013-04-03 23:33:27 -04003466 if (allocated) {
3467 /* Mark the block containing both extents as dirty */
3468 ext4_ext_dirty(handle, inode, path + depth);
3469
3470 /* Update path to point to the right extent */
3471 path[depth].p_ext = abut_ex;
3472 goto out;
3473 } else
3474 allocated = ee_len - (map->m_lblk - ee_block);
Eric Gouriou6f91bc52011-10-27 11:43:23 -04003475
Yongqiang Yang667eff32011-05-03 12:25:07 -04003476 WARN_ON(map->m_lblk < ee_block);
Dmitry Monakhov21ca0872010-05-16 06:00:00 -04003477 /*
3478 * It is safe to convert extent to initialized via explicit
3479 * zeroout only if extent is fully insde i_size or new_size.
3480 */
Yongqiang Yang667eff32011-05-03 12:25:07 -04003481 split_flag |= ee_block + ee_len <= eof_block ? EXT4_EXT_MAY_ZEROOUT : 0;
Dmitry Monakhov21ca0872010-05-16 06:00:00 -04003482
Zheng Liu67a5da52012-08-17 09:54:17 -04003483 if (EXT4_EXT_MAY_ZEROOUT & split_flag)
3484 max_zeroout = sbi->s_extent_max_zeroout_kb >>
Lukas Czerner4f42f802013-03-12 12:40:04 -04003485 (inode->i_sb->s_blocksize_bits - 10);
Zheng Liu67a5da52012-08-17 09:54:17 -04003486
3487 /* If extent is less than s_max_zeroout_kb, zeroout directly */
3488 if (max_zeroout && (ee_len <= max_zeroout)) {
Yongqiang Yang667eff32011-05-03 12:25:07 -04003489 err = ext4_ext_zeroout(inode, ex);
Aneesh Kumar K.V3977c962008-04-17 10:38:59 -04003490 if (err)
Aneesh Kumar K.Vd03856b2008-08-02 18:51:32 -04003491 goto out;
Zheng Liuadb23552013-03-10 21:13:05 -04003492 zero_ex.ee_block = ex->ee_block;
Zheng Liu8cde7ad2013-04-03 12:27:18 -04003493 zero_ex.ee_len = cpu_to_le16(ext4_ext_get_actual_len(ex));
Zheng Liuadb23552013-03-10 21:13:05 -04003494 ext4_ext_store_pblock(&zero_ex, ext4_ext_pblock(ex));
Aneesh Kumar K.Vd03856b2008-08-02 18:51:32 -04003495
3496 err = ext4_ext_get_access(handle, inode, path + depth);
3497 if (err)
3498 goto out;
Yongqiang Yang667eff32011-05-03 12:25:07 -04003499 ext4_ext_mark_initialized(ex);
Theodore Ts'oecb94f52012-08-17 09:44:17 -04003500 ext4_ext_try_to_merge(handle, inode, path, ex);
3501 err = ext4_ext_dirty(handle, inode, path + path->p_depth);
Yongqiang Yang667eff32011-05-03 12:25:07 -04003502 goto out;
Amit Arora56055d32007-07-17 21:42:38 -04003503 }
Yongqiang Yang667eff32011-05-03 12:25:07 -04003504
Amit Arora56055d32007-07-17 21:42:38 -04003505 /*
Yongqiang Yang667eff32011-05-03 12:25:07 -04003506 * four cases:
3507 * 1. split the extent into three extents.
3508 * 2. split the extent into two extents, zeroout the first half.
3509 * 3. split the extent into two extents, zeroout the second half.
3510 * 4. split the extent into two extents with out zeroout.
Amit Arora56055d32007-07-17 21:42:38 -04003511 */
Yongqiang Yang667eff32011-05-03 12:25:07 -04003512 split_map.m_lblk = map->m_lblk;
3513 split_map.m_len = map->m_len;
3514
Zheng Liu67a5da52012-08-17 09:54:17 -04003515 if (max_zeroout && (allocated > map->m_len)) {
3516 if (allocated <= max_zeroout) {
Yongqiang Yang667eff32011-05-03 12:25:07 -04003517 /* case 3 */
3518 zero_ex.ee_block =
Allison Henderson9b940f82011-05-16 10:11:09 -04003519 cpu_to_le32(map->m_lblk);
3520 zero_ex.ee_len = cpu_to_le16(allocated);
Yongqiang Yang667eff32011-05-03 12:25:07 -04003521 ext4_ext_store_pblock(&zero_ex,
3522 ext4_ext_pblock(ex) + map->m_lblk - ee_block);
3523 err = ext4_ext_zeroout(inode, &zero_ex);
Amit Arora56055d32007-07-17 21:42:38 -04003524 if (err)
3525 goto out;
Yongqiang Yang667eff32011-05-03 12:25:07 -04003526 split_map.m_lblk = map->m_lblk;
3527 split_map.m_len = allocated;
Zheng Liu67a5da52012-08-17 09:54:17 -04003528 } else if (map->m_lblk - ee_block + map->m_len < max_zeroout) {
Yongqiang Yang667eff32011-05-03 12:25:07 -04003529 /* case 2 */
3530 if (map->m_lblk != ee_block) {
3531 zero_ex.ee_block = ex->ee_block;
3532 zero_ex.ee_len = cpu_to_le16(map->m_lblk -
3533 ee_block);
3534 ext4_ext_store_pblock(&zero_ex,
3535 ext4_ext_pblock(ex));
3536 err = ext4_ext_zeroout(inode, &zero_ex);
3537 if (err)
3538 goto out;
3539 }
3540
Yongqiang Yang667eff32011-05-03 12:25:07 -04003541 split_map.m_lblk = ee_block;
Allison Henderson9b940f82011-05-16 10:11:09 -04003542 split_map.m_len = map->m_lblk - ee_block + map->m_len;
3543 allocated = map->m_len;
Amit Arora56055d32007-07-17 21:42:38 -04003544 }
3545 }
Yongqiang Yang667eff32011-05-03 12:25:07 -04003546
3547 allocated = ext4_split_extent(handle, inode, path,
Lukas Czerner27dd4382013-04-09 22:11:22 -04003548 &split_map, split_flag, flags);
Yongqiang Yang667eff32011-05-03 12:25:07 -04003549 if (allocated < 0)
3550 err = allocated;
3551
Amit Arora56055d32007-07-17 21:42:38 -04003552out:
Zheng Liuadb23552013-03-10 21:13:05 -04003553 /* If we have gotten a failure, don't zero out status tree */
3554 if (!err)
3555 err = ext4_es_zeroout(inode, &zero_ex);
Amit Arora56055d32007-07-17 21:42:38 -04003556 return err ? err : allocated;
3557}
3558
Aneesh Kumar K.Vc278bfe2008-01-28 23:58:27 -05003559/*
Theodore Ts'oe35fd662010-05-16 19:00:00 -04003560 * This function is called by ext4_ext_map_blocks() from
Mingming Cao00314622009-09-28 15:49:08 -04003561 * ext4_get_blocks_dio_write() when DIO to write
3562 * to an uninitialized extent.
3563 *
Paul Bollefd018fe2011-02-15 00:05:43 +01003564 * Writing to an uninitialized extent may result in splitting the uninitialized
Wang Sheng-Hui30cb27d2012-08-18 22:38:07 -04003565 * extent into multiple initialized/uninitialized extents (up to three)
Mingming Cao00314622009-09-28 15:49:08 -04003566 * There are three possibilities:
3567 * a> There is no split required: Entire extent should be uninitialized
3568 * b> Splits in two extents: Write is happening at either end of the extent
3569 * c> Splits in three extents: Somone is writing in middle of the extent
3570 *
3571 * One of more index blocks maybe needed if the extent tree grow after
Uwe Kleine-Königb5950762010-11-01 15:38:34 -04003572 * the uninitialized extent split. To prevent ENOSPC occur at the IO
Mingming Cao00314622009-09-28 15:49:08 -04003573 * complete, we need to split the uninitialized extent before DIO submit
Uwe Kleine-König421f91d2010-06-11 12:17:00 +02003574 * the IO. The uninitialized extent called at this time will be split
Mingming Cao00314622009-09-28 15:49:08 -04003575 * into three uninitialized extent(at most). After IO complete, the part
3576 * being filled will be convert to initialized by the end_io callback function
3577 * via ext4_convert_unwritten_extents().
Mingmingba230c32009-11-06 04:01:23 -05003578 *
3579 * Returns the size of uninitialized extent to be written on success.
Mingming Cao00314622009-09-28 15:49:08 -04003580 */
3581static int ext4_split_unwritten_extents(handle_t *handle,
3582 struct inode *inode,
Theodore Ts'oe35fd662010-05-16 19:00:00 -04003583 struct ext4_map_blocks *map,
Mingming Cao00314622009-09-28 15:49:08 -04003584 struct ext4_ext_path *path,
Mingming Cao00314622009-09-28 15:49:08 -04003585 int flags)
3586{
Yongqiang Yang667eff32011-05-03 12:25:07 -04003587 ext4_lblk_t eof_block;
3588 ext4_lblk_t ee_block;
3589 struct ext4_extent *ex;
3590 unsigned int ee_len;
3591 int split_flag = 0, depth;
Mingming Cao00314622009-09-28 15:49:08 -04003592
Dmitry Monakhov21ca0872010-05-16 06:00:00 -04003593 ext_debug("ext4_split_unwritten_extents: inode %lu, logical"
3594 "block %llu, max_blocks %u\n", inode->i_ino,
Theodore Ts'oe35fd662010-05-16 19:00:00 -04003595 (unsigned long long)map->m_lblk, map->m_len);
Dmitry Monakhov21ca0872010-05-16 06:00:00 -04003596
3597 eof_block = (inode->i_size + inode->i_sb->s_blocksize - 1) >>
3598 inode->i_sb->s_blocksize_bits;
Theodore Ts'oe35fd662010-05-16 19:00:00 -04003599 if (eof_block < map->m_lblk + map->m_len)
3600 eof_block = map->m_lblk + map->m_len;
Mingming Cao00314622009-09-28 15:49:08 -04003601 /*
Dmitry Monakhov21ca0872010-05-16 06:00:00 -04003602 * It is safe to convert extent to initialized via explicit
3603 * zeroout only if extent is fully insde i_size or new_size.
3604 */
Yongqiang Yang667eff32011-05-03 12:25:07 -04003605 depth = ext_depth(inode);
3606 ex = path[depth].p_ext;
3607 ee_block = le32_to_cpu(ex->ee_block);
3608 ee_len = ext4_ext_get_actual_len(ex);
Dmitry Monakhov21ca0872010-05-16 06:00:00 -04003609
Yongqiang Yang667eff32011-05-03 12:25:07 -04003610 split_flag |= ee_block + ee_len <= eof_block ? EXT4_EXT_MAY_ZEROOUT : 0;
3611 split_flag |= EXT4_EXT_MARK_UNINIT2;
Dmitry Monakhovdee1f972012-10-10 01:04:58 -04003612 if (flags & EXT4_GET_BLOCKS_CONVERT)
3613 split_flag |= EXT4_EXT_DATA_VALID2;
Yongqiang Yang667eff32011-05-03 12:25:07 -04003614 flags |= EXT4_GET_BLOCKS_PRE_IO;
3615 return ext4_split_extent(handle, inode, path, map, split_flag, flags);
Mingming Cao00314622009-09-28 15:49:08 -04003616}
Yongqiang Yang197217a2011-05-03 11:45:29 -04003617
Jiaying Zhangc7064ef2010-03-02 13:28:44 -05003618static int ext4_convert_unwritten_extents_endio(handle_t *handle,
Dmitry Monakhovdee1f972012-10-10 01:04:58 -04003619 struct inode *inode,
3620 struct ext4_map_blocks *map,
3621 struct ext4_ext_path *path)
Mingming Cao00314622009-09-28 15:49:08 -04003622{
3623 struct ext4_extent *ex;
Dmitry Monakhovdee1f972012-10-10 01:04:58 -04003624 ext4_lblk_t ee_block;
3625 unsigned int ee_len;
Mingming Cao00314622009-09-28 15:49:08 -04003626 int depth;
3627 int err = 0;
Mingming Cao00314622009-09-28 15:49:08 -04003628
3629 depth = ext_depth(inode);
Mingming Cao00314622009-09-28 15:49:08 -04003630 ex = path[depth].p_ext;
Dmitry Monakhovdee1f972012-10-10 01:04:58 -04003631 ee_block = le32_to_cpu(ex->ee_block);
3632 ee_len = ext4_ext_get_actual_len(ex);
Mingming Cao00314622009-09-28 15:49:08 -04003633
Yongqiang Yang197217a2011-05-03 11:45:29 -04003634 ext_debug("ext4_convert_unwritten_extents_endio: inode %lu, logical"
3635 "block %llu, max_blocks %u\n", inode->i_ino,
Dmitry Monakhovdee1f972012-10-10 01:04:58 -04003636 (unsigned long long)ee_block, ee_len);
3637
Dmitry Monakhovff95ec22013-03-04 00:41:05 -05003638 /* If extent is larger than requested it is a clear sign that we still
3639 * have some extent state machine issues left. So extent_split is still
3640 * required.
3641 * TODO: Once all related issues will be fixed this situation should be
3642 * illegal.
3643 */
Dmitry Monakhovdee1f972012-10-10 01:04:58 -04003644 if (ee_block != map->m_lblk || ee_len > map->m_len) {
Dmitry Monakhovff95ec22013-03-04 00:41:05 -05003645#ifdef EXT4_DEBUG
3646 ext4_warning("Inode (%ld) finished: extent logical block %llu,"
3647 " len %u; IO logical block %llu, len %u\n",
3648 inode->i_ino, (unsigned long long)ee_block, ee_len,
3649 (unsigned long long)map->m_lblk, map->m_len);
3650#endif
Dmitry Monakhovdee1f972012-10-10 01:04:58 -04003651 err = ext4_split_unwritten_extents(handle, inode, map, path,
3652 EXT4_GET_BLOCKS_CONVERT);
3653 if (err < 0)
3654 goto out;
3655 ext4_ext_drop_refs(path);
Theodore Ts'o107a7bd2013-08-16 21:23:41 -04003656 path = ext4_ext_find_extent(inode, map->m_lblk, path, 0);
Dmitry Monakhovdee1f972012-10-10 01:04:58 -04003657 if (IS_ERR(path)) {
3658 err = PTR_ERR(path);
3659 goto out;
3660 }
3661 depth = ext_depth(inode);
3662 ex = path[depth].p_ext;
3663 }
Yongqiang Yang197217a2011-05-03 11:45:29 -04003664
Mingming Cao00314622009-09-28 15:49:08 -04003665 err = ext4_ext_get_access(handle, inode, path + depth);
3666 if (err)
3667 goto out;
3668 /* first mark the extent as initialized */
3669 ext4_ext_mark_initialized(ex);
3670
Yongqiang Yang197217a2011-05-03 11:45:29 -04003671 /* note: ext4_ext_correct_indexes() isn't needed here because
3672 * borders are not changed
Mingming Cao00314622009-09-28 15:49:08 -04003673 */
Theodore Ts'oecb94f52012-08-17 09:44:17 -04003674 ext4_ext_try_to_merge(handle, inode, path, ex);
Yongqiang Yang197217a2011-05-03 11:45:29 -04003675
Mingming Cao00314622009-09-28 15:49:08 -04003676 /* Mark modified extent as dirty */
Theodore Ts'oecb94f52012-08-17 09:44:17 -04003677 err = ext4_ext_dirty(handle, inode, path + path->p_depth);
Mingming Cao00314622009-09-28 15:49:08 -04003678out:
3679 ext4_ext_show_leaf(inode, path);
3680 return err;
3681}
3682
Aneesh Kumar K.V515f41c2009-12-29 23:39:06 -05003683static void unmap_underlying_metadata_blocks(struct block_device *bdev,
3684 sector_t block, int count)
3685{
3686 int i;
3687 for (i = 0; i < count; i++)
3688 unmap_underlying_metadata(bdev, block + i);
3689}
3690
Theodore Ts'o58590b02010-10-27 21:23:12 -04003691/*
3692 * Handle EOFBLOCKS_FL flag, clearing it if necessary
3693 */
3694static int check_eofblocks_fl(handle_t *handle, struct inode *inode,
Eric Sandeend002ebf2011-01-10 13:03:35 -05003695 ext4_lblk_t lblk,
Theodore Ts'o58590b02010-10-27 21:23:12 -04003696 struct ext4_ext_path *path,
3697 unsigned int len)
3698{
3699 int i, depth;
3700 struct ext4_extent_header *eh;
Sergey Senozhatsky65922cb2011-03-23 14:08:27 -04003701 struct ext4_extent *last_ex;
Theodore Ts'o58590b02010-10-27 21:23:12 -04003702
3703 if (!ext4_test_inode_flag(inode, EXT4_INODE_EOFBLOCKS))
3704 return 0;
3705
3706 depth = ext_depth(inode);
3707 eh = path[depth].p_hdr;
Theodore Ts'o58590b02010-10-27 21:23:12 -04003708
Lukas Czernerafcff5d2012-03-21 21:47:55 -04003709 /*
3710 * We're going to remove EOFBLOCKS_FL entirely in future so we
3711 * do not care for this case anymore. Simply remove the flag
3712 * if there are no extents.
3713 */
3714 if (unlikely(!eh->eh_entries))
3715 goto out;
Theodore Ts'o58590b02010-10-27 21:23:12 -04003716 last_ex = EXT_LAST_EXTENT(eh);
3717 /*
3718 * We should clear the EOFBLOCKS_FL flag if we are writing the
3719 * last block in the last extent in the file. We test this by
3720 * first checking to see if the caller to
3721 * ext4_ext_get_blocks() was interested in the last block (or
3722 * a block beyond the last block) in the current extent. If
3723 * this turns out to be false, we can bail out from this
3724 * function immediately.
3725 */
Eric Sandeend002ebf2011-01-10 13:03:35 -05003726 if (lblk + len < le32_to_cpu(last_ex->ee_block) +
Theodore Ts'o58590b02010-10-27 21:23:12 -04003727 ext4_ext_get_actual_len(last_ex))
3728 return 0;
3729 /*
3730 * If the caller does appear to be planning to write at or
3731 * beyond the end of the current extent, we then test to see
3732 * if the current extent is the last extent in the file, by
3733 * checking to make sure it was reached via the rightmost node
3734 * at each level of the tree.
3735 */
3736 for (i = depth-1; i >= 0; i--)
3737 if (path[i].p_idx != EXT_LAST_INDEX(path[i].p_hdr))
3738 return 0;
Lukas Czernerafcff5d2012-03-21 21:47:55 -04003739out:
Theodore Ts'o58590b02010-10-27 21:23:12 -04003740 ext4_clear_inode_flag(inode, EXT4_INODE_EOFBLOCKS);
3741 return ext4_mark_inode_dirty(handle, inode);
3742}
3743
Aditya Kali7b415bf2011-09-09 19:04:51 -04003744/**
3745 * ext4_find_delalloc_range: find delayed allocated block in the given range.
3746 *
Zheng Liu7d1b1fb2012-11-08 21:57:35 -05003747 * Return 1 if there is a delalloc block in the range, otherwise 0.
Aditya Kali7b415bf2011-09-09 19:04:51 -04003748 */
Zheng Liuf7fec032013-02-18 00:28:47 -05003749int ext4_find_delalloc_range(struct inode *inode,
3750 ext4_lblk_t lblk_start,
3751 ext4_lblk_t lblk_end)
Aditya Kali7b415bf2011-09-09 19:04:51 -04003752{
Zheng Liu7d1b1fb2012-11-08 21:57:35 -05003753 struct extent_status es;
Aditya Kali7b415bf2011-09-09 19:04:51 -04003754
Yan, Zhenge30b5dc2013-05-03 02:15:52 -04003755 ext4_es_find_delayed_extent_range(inode, lblk_start, lblk_end, &es);
Zheng Liu06b0c882013-02-18 00:26:51 -05003756 if (es.es_len == 0)
Zheng Liu7d1b1fb2012-11-08 21:57:35 -05003757 return 0; /* there is no delay extent in this tree */
Zheng Liu06b0c882013-02-18 00:26:51 -05003758 else if (es.es_lblk <= lblk_start &&
3759 lblk_start < es.es_lblk + es.es_len)
Zheng Liu7d1b1fb2012-11-08 21:57:35 -05003760 return 1;
Zheng Liu06b0c882013-02-18 00:26:51 -05003761 else if (lblk_start <= es.es_lblk && es.es_lblk <= lblk_end)
Zheng Liu7d1b1fb2012-11-08 21:57:35 -05003762 return 1;
Aditya Kali7b415bf2011-09-09 19:04:51 -04003763 else
Zheng Liu7d1b1fb2012-11-08 21:57:35 -05003764 return 0;
Aditya Kali7b415bf2011-09-09 19:04:51 -04003765}
3766
Zheng Liu7d1b1fb2012-11-08 21:57:35 -05003767int ext4_find_delalloc_cluster(struct inode *inode, ext4_lblk_t lblk)
Aditya Kali7b415bf2011-09-09 19:04:51 -04003768{
3769 struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
3770 ext4_lblk_t lblk_start, lblk_end;
3771 lblk_start = lblk & (~(sbi->s_cluster_ratio - 1));
3772 lblk_end = lblk_start + sbi->s_cluster_ratio - 1;
3773
Zheng Liu7d1b1fb2012-11-08 21:57:35 -05003774 return ext4_find_delalloc_range(inode, lblk_start, lblk_end);
Aditya Kali7b415bf2011-09-09 19:04:51 -04003775}
3776
3777/**
3778 * Determines how many complete clusters (out of those specified by the 'map')
3779 * are under delalloc and were reserved quota for.
3780 * This function is called when we are writing out the blocks that were
3781 * originally written with their allocation delayed, but then the space was
3782 * allocated using fallocate() before the delayed allocation could be resolved.
3783 * The cases to look for are:
3784 * ('=' indicated delayed allocated blocks
3785 * '-' indicates non-delayed allocated blocks)
3786 * (a) partial clusters towards beginning and/or end outside of allocated range
3787 * are not delalloc'ed.
3788 * Ex:
3789 * |----c---=|====c====|====c====|===-c----|
3790 * |++++++ allocated ++++++|
3791 * ==> 4 complete clusters in above example
3792 *
3793 * (b) partial cluster (outside of allocated range) towards either end is
3794 * marked for delayed allocation. In this case, we will exclude that
3795 * cluster.
3796 * Ex:
3797 * |----====c========|========c========|
3798 * |++++++ allocated ++++++|
3799 * ==> 1 complete clusters in above example
3800 *
3801 * Ex:
3802 * |================c================|
3803 * |++++++ allocated ++++++|
3804 * ==> 0 complete clusters in above example
3805 *
3806 * The ext4_da_update_reserve_space will be called only if we
3807 * determine here that there were some "entire" clusters that span
3808 * this 'allocated' range.
3809 * In the non-bigalloc case, this function will just end up returning num_blks
3810 * without ever calling ext4_find_delalloc_range.
3811 */
3812static unsigned int
3813get_reserved_cluster_alloc(struct inode *inode, ext4_lblk_t lblk_start,
3814 unsigned int num_blks)
3815{
3816 struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
3817 ext4_lblk_t alloc_cluster_start, alloc_cluster_end;
3818 ext4_lblk_t lblk_from, lblk_to, c_offset;
3819 unsigned int allocated_clusters = 0;
3820
3821 alloc_cluster_start = EXT4_B2C(sbi, lblk_start);
3822 alloc_cluster_end = EXT4_B2C(sbi, lblk_start + num_blks - 1);
3823
3824 /* max possible clusters for this allocation */
3825 allocated_clusters = alloc_cluster_end - alloc_cluster_start + 1;
3826
Aditya Kalid8990242011-09-09 19:18:51 -04003827 trace_ext4_get_reserved_cluster_alloc(inode, lblk_start, num_blks);
3828
Aditya Kali7b415bf2011-09-09 19:04:51 -04003829 /* Check towards left side */
3830 c_offset = lblk_start & (sbi->s_cluster_ratio - 1);
3831 if (c_offset) {
3832 lblk_from = lblk_start & (~(sbi->s_cluster_ratio - 1));
3833 lblk_to = lblk_from + c_offset - 1;
3834
Zheng Liu7d1b1fb2012-11-08 21:57:35 -05003835 if (ext4_find_delalloc_range(inode, lblk_from, lblk_to))
Aditya Kali7b415bf2011-09-09 19:04:51 -04003836 allocated_clusters--;
3837 }
3838
3839 /* Now check towards right. */
3840 c_offset = (lblk_start + num_blks) & (sbi->s_cluster_ratio - 1);
3841 if (allocated_clusters && c_offset) {
3842 lblk_from = lblk_start + num_blks;
3843 lblk_to = lblk_from + (sbi->s_cluster_ratio - c_offset) - 1;
3844
Zheng Liu7d1b1fb2012-11-08 21:57:35 -05003845 if (ext4_find_delalloc_range(inode, lblk_from, lblk_to))
Aditya Kali7b415bf2011-09-09 19:04:51 -04003846 allocated_clusters--;
3847 }
3848
3849 return allocated_clusters;
3850}
3851
Mingming Cao00314622009-09-28 15:49:08 -04003852static int
3853ext4_ext_handle_uninitialized_extents(handle_t *handle, struct inode *inode,
Theodore Ts'oe35fd662010-05-16 19:00:00 -04003854 struct ext4_map_blocks *map,
Mingming Cao00314622009-09-28 15:49:08 -04003855 struct ext4_ext_path *path, int flags,
Theodore Ts'oe35fd662010-05-16 19:00:00 -04003856 unsigned int allocated, ext4_fsblk_t newblock)
Mingming Cao00314622009-09-28 15:49:08 -04003857{
3858 int ret = 0;
3859 int err = 0;
Dmitry Monakhovf45ee3a2012-09-28 23:21:09 -04003860 ext4_io_end_t *io = ext4_inode_aio(inode);
Mingming Cao00314622009-09-28 15:49:08 -04003861
Zheng Liu88635ca2011-12-28 19:00:25 -05003862 ext_debug("ext4_ext_handle_uninitialized_extents: inode %lu, logical "
3863 "block %llu, max_blocks %u, flags %x, allocated %u\n",
Theodore Ts'oe35fd662010-05-16 19:00:00 -04003864 inode->i_ino, (unsigned long long)map->m_lblk, map->m_len,
Mingming Cao00314622009-09-28 15:49:08 -04003865 flags, allocated);
3866 ext4_ext_show_leaf(inode, path);
3867
Lukas Czerner27dd4382013-04-09 22:11:22 -04003868 /*
3869 * When writing into uninitialized space, we should not fail to
3870 * allocate metadata blocks for the new extent block if needed.
3871 */
3872 flags |= EXT4_GET_BLOCKS_METADATA_NOFAIL;
3873
Zheng Liub5645532012-11-08 14:33:43 -05003874 trace_ext4_ext_handle_uninitialized_extents(inode, map, flags,
3875 allocated, newblock);
Aditya Kalid8990242011-09-09 19:18:51 -04003876
Jiaying Zhangc7064ef2010-03-02 13:28:44 -05003877 /* get_block() before submit the IO, split the extent */
Jiaying Zhang744692d2010-03-04 16:14:02 -05003878 if ((flags & EXT4_GET_BLOCKS_PRE_IO)) {
Theodore Ts'oe35fd662010-05-16 19:00:00 -04003879 ret = ext4_split_unwritten_extents(handle, inode, map,
3880 path, flags);
Dmitry Monakhov82e54222012-09-28 23:36:25 -04003881 if (ret <= 0)
3882 goto out;
Mingming5f524952009-11-10 10:48:04 -05003883 /*
3884 * Flag the inode(non aio case) or end_io struct (aio case)
Lucas De Marchi25985ed2011-03-30 22:57:33 -03003885 * that this IO needs to conversion to written when IO is
Mingming5f524952009-11-10 10:48:04 -05003886 * completed
3887 */
Tao Ma0edeb712011-10-31 17:30:44 -04003888 if (io)
3889 ext4_set_io_unwritten_flag(inode, io);
3890 else
Theodore Ts'o19f5fb72010-01-24 14:34:07 -05003891 ext4_set_inode_state(inode, EXT4_STATE_DIO_UNWRITTEN);
Zheng Liua25a4e12013-02-18 00:28:04 -05003892 map->m_flags |= EXT4_MAP_UNWRITTEN;
Jiaying Zhang744692d2010-03-04 16:14:02 -05003893 if (ext4_should_dioread_nolock(inode))
Theodore Ts'oe35fd662010-05-16 19:00:00 -04003894 map->m_flags |= EXT4_MAP_UNINIT;
Mingming Cao00314622009-09-28 15:49:08 -04003895 goto out;
3896 }
Jiaying Zhangc7064ef2010-03-02 13:28:44 -05003897 /* IO end_io complete, convert the filled extent to written */
Jiaying Zhang744692d2010-03-04 16:14:02 -05003898 if ((flags & EXT4_GET_BLOCKS_CONVERT)) {
Dmitry Monakhovdee1f972012-10-10 01:04:58 -04003899 ret = ext4_convert_unwritten_extents_endio(handle, inode, map,
Mingming Cao00314622009-09-28 15:49:08 -04003900 path);
Theodore Ts'o58590b02010-10-27 21:23:12 -04003901 if (ret >= 0) {
Jan Karab436b9b2009-12-08 23:51:10 -05003902 ext4_update_inode_fsync_trans(handle, inode, 1);
Eric Sandeend002ebf2011-01-10 13:03:35 -05003903 err = check_eofblocks_fl(handle, inode, map->m_lblk,
3904 path, map->m_len);
Theodore Ts'o58590b02010-10-27 21:23:12 -04003905 } else
3906 err = ret;
Zheng Liucdee7842013-03-10 21:08:52 -04003907 map->m_flags |= EXT4_MAP_MAPPED;
3908 if (allocated > map->m_len)
3909 allocated = map->m_len;
3910 map->m_len = allocated;
Mingming Cao00314622009-09-28 15:49:08 -04003911 goto out2;
3912 }
3913 /* buffered IO case */
3914 /*
3915 * repeat fallocate creation request
3916 * we already have an unwritten extent
3917 */
Zheng Liua25a4e12013-02-18 00:28:04 -05003918 if (flags & EXT4_GET_BLOCKS_UNINIT_EXT) {
3919 map->m_flags |= EXT4_MAP_UNWRITTEN;
Mingming Cao00314622009-09-28 15:49:08 -04003920 goto map_out;
Zheng Liua25a4e12013-02-18 00:28:04 -05003921 }
Mingming Cao00314622009-09-28 15:49:08 -04003922
3923 /* buffered READ or buffered write_begin() lookup */
3924 if ((flags & EXT4_GET_BLOCKS_CREATE) == 0) {
3925 /*
3926 * We have blocks reserved already. We
3927 * return allocated blocks so that delalloc
3928 * won't do block reservation for us. But
3929 * the buffer head will be unmapped so that
3930 * a read from the block returns 0s.
3931 */
Theodore Ts'oe35fd662010-05-16 19:00:00 -04003932 map->m_flags |= EXT4_MAP_UNWRITTEN;
Mingming Cao00314622009-09-28 15:49:08 -04003933 goto out1;
3934 }
3935
3936 /* buffered write, writepage time, convert*/
Lukas Czerner27dd4382013-04-09 22:11:22 -04003937 ret = ext4_ext_convert_to_initialized(handle, inode, map, path, flags);
Dmitry Monakhova4e5d882011-10-25 08:15:12 -04003938 if (ret >= 0)
Jan Karab436b9b2009-12-08 23:51:10 -05003939 ext4_update_inode_fsync_trans(handle, inode, 1);
Mingming Cao00314622009-09-28 15:49:08 -04003940out:
3941 if (ret <= 0) {
3942 err = ret;
3943 goto out2;
3944 } else
3945 allocated = ret;
Theodore Ts'oe35fd662010-05-16 19:00:00 -04003946 map->m_flags |= EXT4_MAP_NEW;
Aneesh Kumar K.V515f41c2009-12-29 23:39:06 -05003947 /*
3948 * if we allocated more blocks than requested
3949 * we need to make sure we unmap the extra block
3950 * allocated. The actual needed block will get
3951 * unmapped later when we find the buffer_head marked
3952 * new.
3953 */
Theodore Ts'oe35fd662010-05-16 19:00:00 -04003954 if (allocated > map->m_len) {
Aneesh Kumar K.V515f41c2009-12-29 23:39:06 -05003955 unmap_underlying_metadata_blocks(inode->i_sb->s_bdev,
Theodore Ts'oe35fd662010-05-16 19:00:00 -04003956 newblock + map->m_len,
3957 allocated - map->m_len);
3958 allocated = map->m_len;
Aneesh Kumar K.V515f41c2009-12-29 23:39:06 -05003959 }
Zheng Liu3a225672013-03-10 21:20:23 -04003960 map->m_len = allocated;
Aneesh Kumar K.V5f634d02010-01-25 04:00:31 -05003961
3962 /*
3963 * If we have done fallocate with the offset that is already
3964 * delayed allocated, we would have block reservation
3965 * and quota reservation done in the delayed write path.
3966 * But fallocate would have already updated quota and block
3967 * count for this offset. So cancel these reservation
3968 */
Aditya Kali7b415bf2011-09-09 19:04:51 -04003969 if (flags & EXT4_GET_BLOCKS_DELALLOC_RESERVE) {
3970 unsigned int reserved_clusters;
3971 reserved_clusters = get_reserved_cluster_alloc(inode,
3972 map->m_lblk, map->m_len);
3973 if (reserved_clusters)
3974 ext4_da_update_reserve_space(inode,
3975 reserved_clusters,
3976 0);
3977 }
Aneesh Kumar K.V5f634d02010-01-25 04:00:31 -05003978
Mingming Cao00314622009-09-28 15:49:08 -04003979map_out:
Theodore Ts'oe35fd662010-05-16 19:00:00 -04003980 map->m_flags |= EXT4_MAP_MAPPED;
Dmitry Monakhova4e5d882011-10-25 08:15:12 -04003981 if ((flags & EXT4_GET_BLOCKS_KEEP_SIZE) == 0) {
3982 err = check_eofblocks_fl(handle, inode, map->m_lblk, path,
3983 map->m_len);
3984 if (err < 0)
3985 goto out2;
3986 }
Mingming Cao00314622009-09-28 15:49:08 -04003987out1:
Theodore Ts'oe35fd662010-05-16 19:00:00 -04003988 if (allocated > map->m_len)
3989 allocated = map->m_len;
Mingming Cao00314622009-09-28 15:49:08 -04003990 ext4_ext_show_leaf(inode, path);
Theodore Ts'oe35fd662010-05-16 19:00:00 -04003991 map->m_pblk = newblock;
3992 map->m_len = allocated;
Mingming Cao00314622009-09-28 15:49:08 -04003993out2:
3994 if (path) {
3995 ext4_ext_drop_refs(path);
3996 kfree(path);
3997 }
3998 return err ? err : allocated;
3999}
Theodore Ts'o58590b02010-10-27 21:23:12 -04004000
Mingming Cao00314622009-09-28 15:49:08 -04004001/*
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004002 * get_implied_cluster_alloc - check to see if the requested
4003 * allocation (in the map structure) overlaps with a cluster already
4004 * allocated in an extent.
Aditya Kalid8990242011-09-09 19:18:51 -04004005 * @sb The filesystem superblock structure
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004006 * @map The requested lblk->pblk mapping
4007 * @ex The extent structure which might contain an implied
4008 * cluster allocation
4009 *
4010 * This function is called by ext4_ext_map_blocks() after we failed to
4011 * find blocks that were already in the inode's extent tree. Hence,
4012 * we know that the beginning of the requested region cannot overlap
4013 * the extent from the inode's extent tree. There are three cases we
4014 * want to catch. The first is this case:
4015 *
4016 * |--- cluster # N--|
4017 * |--- extent ---| |---- requested region ---|
4018 * |==========|
4019 *
4020 * The second case that we need to test for is this one:
4021 *
4022 * |--------- cluster # N ----------------|
4023 * |--- requested region --| |------- extent ----|
4024 * |=======================|
4025 *
4026 * The third case is when the requested region lies between two extents
4027 * within the same cluster:
4028 * |------------- cluster # N-------------|
4029 * |----- ex -----| |---- ex_right ----|
4030 * |------ requested region ------|
4031 * |================|
4032 *
4033 * In each of the above cases, we need to set the map->m_pblk and
4034 * map->m_len so it corresponds to the return the extent labelled as
4035 * "|====|" from cluster #N, since it is already in use for data in
4036 * cluster EXT4_B2C(sbi, map->m_lblk). We will then return 1 to
4037 * signal to ext4_ext_map_blocks() that map->m_pblk should be treated
4038 * as a new "allocated" block region. Otherwise, we will return 0 and
4039 * ext4_ext_map_blocks() will then allocate one or more new clusters
4040 * by calling ext4_mb_new_blocks().
4041 */
Aditya Kalid8990242011-09-09 19:18:51 -04004042static int get_implied_cluster_alloc(struct super_block *sb,
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004043 struct ext4_map_blocks *map,
4044 struct ext4_extent *ex,
4045 struct ext4_ext_path *path)
4046{
Aditya Kalid8990242011-09-09 19:18:51 -04004047 struct ext4_sb_info *sbi = EXT4_SB(sb);
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004048 ext4_lblk_t c_offset = map->m_lblk & (sbi->s_cluster_ratio-1);
4049 ext4_lblk_t ex_cluster_start, ex_cluster_end;
Curt Wohlgemuth14d7f3e2011-12-18 17:39:02 -05004050 ext4_lblk_t rr_cluster_start;
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004051 ext4_lblk_t ee_block = le32_to_cpu(ex->ee_block);
4052 ext4_fsblk_t ee_start = ext4_ext_pblock(ex);
4053 unsigned short ee_len = ext4_ext_get_actual_len(ex);
4054
4055 /* The extent passed in that we are trying to match */
4056 ex_cluster_start = EXT4_B2C(sbi, ee_block);
4057 ex_cluster_end = EXT4_B2C(sbi, ee_block + ee_len - 1);
4058
4059 /* The requested region passed into ext4_map_blocks() */
4060 rr_cluster_start = EXT4_B2C(sbi, map->m_lblk);
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004061
4062 if ((rr_cluster_start == ex_cluster_end) ||
4063 (rr_cluster_start == ex_cluster_start)) {
4064 if (rr_cluster_start == ex_cluster_end)
4065 ee_start += ee_len - 1;
4066 map->m_pblk = (ee_start & ~(sbi->s_cluster_ratio - 1)) +
4067 c_offset;
4068 map->m_len = min(map->m_len,
4069 (unsigned) sbi->s_cluster_ratio - c_offset);
4070 /*
4071 * Check for and handle this case:
4072 *
4073 * |--------- cluster # N-------------|
4074 * |------- extent ----|
4075 * |--- requested region ---|
4076 * |===========|
4077 */
4078
4079 if (map->m_lblk < ee_block)
4080 map->m_len = min(map->m_len, ee_block - map->m_lblk);
4081
4082 /*
4083 * Check for the case where there is already another allocated
4084 * block to the right of 'ex' but before the end of the cluster.
4085 *
4086 * |------------- cluster # N-------------|
4087 * |----- ex -----| |---- ex_right ----|
4088 * |------ requested region ------|
4089 * |================|
4090 */
4091 if (map->m_lblk > ee_block) {
4092 ext4_lblk_t next = ext4_ext_next_allocated_block(path);
4093 map->m_len = min(map->m_len, next - map->m_lblk);
4094 }
Aditya Kalid8990242011-09-09 19:18:51 -04004095
4096 trace_ext4_get_implied_cluster_alloc_exit(sb, map, 1);
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004097 return 1;
4098 }
Aditya Kalid8990242011-09-09 19:18:51 -04004099
4100 trace_ext4_get_implied_cluster_alloc_exit(sb, map, 0);
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004101 return 0;
4102}
4103
4104
4105/*
Mingming Caof5ab0d12008-02-25 15:29:55 -05004106 * Block allocation/map/preallocation routine for extents based files
4107 *
4108 *
Aneesh Kumar K.Vc278bfe2008-01-28 23:58:27 -05004109 * Need to be called with
Aneesh Kumar K.V0e855ac2008-01-28 23:58:26 -05004110 * down_read(&EXT4_I(inode)->i_data_sem) if not allocating file system block
4111 * (ie, create is zero). Otherwise down_write(&EXT4_I(inode)->i_data_sem)
Mingming Caof5ab0d12008-02-25 15:29:55 -05004112 *
4113 * return > 0, number of of blocks already mapped/allocated
4114 * if create == 0 and these are pre-allocated blocks
4115 * buffer head is unmapped
4116 * otherwise blocks are mapped
4117 *
4118 * return = 0, if plain look up failed (blocks have not been allocated)
4119 * buffer head is unmapped
4120 *
4121 * return < 0, error case.
Aneesh Kumar K.Vc278bfe2008-01-28 23:58:27 -05004122 */
Theodore Ts'oe35fd662010-05-16 19:00:00 -04004123int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
4124 struct ext4_map_blocks *map, int flags)
Alex Tomasa86c6182006-10-11 01:21:03 -07004125{
4126 struct ext4_ext_path *path = NULL;
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004127 struct ext4_extent newex, *ex, *ex2;
4128 struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
Jiaying Zhang0562e0b2011-03-21 21:38:05 -04004129 ext4_fsblk_t newblock = 0;
Zheng Liu37794732012-11-08 14:47:52 -05004130 int free_on_err = 0, err = 0, depth;
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004131 unsigned int allocated = 0, offset = 0;
Yongqiang Yang81fdbb42011-10-29 09:23:38 -04004132 unsigned int allocated_clusters = 0;
Alex Tomasc9de5602008-01-29 00:19:52 -05004133 struct ext4_allocation_request ar;
Dmitry Monakhovf45ee3a2012-09-28 23:21:09 -04004134 ext4_io_end_t *io = ext4_inode_aio(inode);
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004135 ext4_lblk_t cluster_offset;
Dmitry Monakhov82e54222012-09-28 23:36:25 -04004136 int set_unwritten = 0;
Alex Tomasa86c6182006-10-11 01:21:03 -07004137
Mingming84fe3be2009-09-01 08:44:37 -04004138 ext_debug("blocks %u/%u requested for inode %lu\n",
Theodore Ts'oe35fd662010-05-16 19:00:00 -04004139 map->m_lblk, map->m_len, inode->i_ino);
Jiaying Zhang0562e0b2011-03-21 21:38:05 -04004140 trace_ext4_ext_map_blocks_enter(inode, map->m_lblk, map->m_len, flags);
Alex Tomasa86c6182006-10-11 01:21:03 -07004141
Alex Tomasa86c6182006-10-11 01:21:03 -07004142 /* find extent for this block */
Theodore Ts'o107a7bd2013-08-16 21:23:41 -04004143 path = ext4_ext_find_extent(inode, map->m_lblk, NULL, 0);
Alex Tomasa86c6182006-10-11 01:21:03 -07004144 if (IS_ERR(path)) {
4145 err = PTR_ERR(path);
4146 path = NULL;
4147 goto out2;
4148 }
4149
4150 depth = ext_depth(inode);
4151
4152 /*
Randy Dunlapd0d856e2006-10-11 01:21:07 -07004153 * consistent leaf must not be empty;
4154 * this situation is possible, though, _during_ tree modification;
Alex Tomasa86c6182006-10-11 01:21:03 -07004155 * this is why assert can't be put in ext4_ext_find_extent()
4156 */
Frank Mayhar273df552010-03-02 11:46:09 -05004157 if (unlikely(path[depth].p_ext == NULL && depth != 0)) {
4158 EXT4_ERROR_INODE(inode, "bad extent address "
Theodore Ts'of70f3622010-05-16 23:00:00 -04004159 "lblock: %lu, depth: %d pblock %lld",
4160 (unsigned long) map->m_lblk, depth,
4161 path[depth].p_block);
Surbhi Palande034fb4c2009-12-14 09:53:52 -05004162 err = -EIO;
4163 goto out2;
4164 }
Alex Tomasa86c6182006-10-11 01:21:03 -07004165
Avantika Mathur7e028972006-12-06 20:41:33 -08004166 ex = path[depth].p_ext;
4167 if (ex) {
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05004168 ext4_lblk_t ee_block = le32_to_cpu(ex->ee_block);
Theodore Ts'obf89d162010-10-27 21:30:14 -04004169 ext4_fsblk_t ee_start = ext4_ext_pblock(ex);
Amit Aroraa2df2a62007-07-17 21:42:41 -04004170 unsigned short ee_len;
Suparna Bhattacharya471d4012006-10-11 01:21:06 -07004171
4172 /*
Suparna Bhattacharya471d4012006-10-11 01:21:06 -07004173 * Uninitialized extents are treated as holes, except that
Amit Arora56055d32007-07-17 21:42:38 -04004174 * we split out initialized portions during a write.
Suparna Bhattacharya471d4012006-10-11 01:21:06 -07004175 */
Amit Aroraa2df2a62007-07-17 21:42:41 -04004176 ee_len = ext4_ext_get_actual_len(ex);
Aditya Kalid8990242011-09-09 19:18:51 -04004177
4178 trace_ext4_ext_show_extent(inode, ee_block, ee_start, ee_len);
4179
Randy Dunlapd0d856e2006-10-11 01:21:07 -07004180 /* if found extent covers block, simply return it */
Theodore Ts'oe35fd662010-05-16 19:00:00 -04004181 if (in_range(map->m_lblk, ee_block, ee_len)) {
4182 newblock = map->m_lblk - ee_block + ee_start;
Randy Dunlapd0d856e2006-10-11 01:21:07 -07004183 /* number of remaining blocks in the extent */
Theodore Ts'oe35fd662010-05-16 19:00:00 -04004184 allocated = ee_len - (map->m_lblk - ee_block);
4185 ext_debug("%u fit into %u:%d -> %llu\n", map->m_lblk,
4186 ee_block, ee_len, newblock);
Amit Arora56055d32007-07-17 21:42:38 -04004187
Zheng Liu69eb33d2013-02-18 00:31:07 -05004188 if (!ext4_ext_is_uninitialized(ex))
Lukas Czerner78771912012-03-19 23:05:43 -04004189 goto out;
Zheng Liu69eb33d2013-02-18 00:31:07 -05004190
Zheng Liu37794732012-11-08 14:47:52 -05004191 allocated = ext4_ext_handle_uninitialized_extents(
Lukas Czerner78771912012-03-19 23:05:43 -04004192 handle, inode, map, path, flags,
4193 allocated, newblock);
Zheng Liu37794732012-11-08 14:47:52 -05004194 goto out3;
Alex Tomasa86c6182006-10-11 01:21:03 -07004195 }
4196 }
4197
Aditya Kali7b415bf2011-09-09 19:04:51 -04004198 if ((sbi->s_cluster_ratio > 1) &&
Zheng Liu7d1b1fb2012-11-08 21:57:35 -05004199 ext4_find_delalloc_cluster(inode, map->m_lblk))
Aditya Kali7b415bf2011-09-09 19:04:51 -04004200 map->m_flags |= EXT4_MAP_FROM_CLUSTER;
4201
Alex Tomasa86c6182006-10-11 01:21:03 -07004202 /*
Randy Dunlapd0d856e2006-10-11 01:21:07 -07004203 * requested block isn't allocated yet;
Alex Tomasa86c6182006-10-11 01:21:03 -07004204 * we couldn't try to create block if create flag is zero
4205 */
Theodore Ts'oc2177052009-05-14 00:58:52 -04004206 if ((flags & EXT4_GET_BLOCKS_CREATE) == 0) {
Amit Arora56055d32007-07-17 21:42:38 -04004207 /*
4208 * put just found gap into cache to speed up
4209 * subsequent requests
4210 */
Zheng Liud100eef2013-02-18 00:29:59 -05004211 if ((flags & EXT4_GET_BLOCKS_NO_PUT_HOLE) == 0)
4212 ext4_ext_put_gap_in_cache(inode, path, map->m_lblk);
Alex Tomasa86c6182006-10-11 01:21:03 -07004213 goto out2;
4214 }
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004215
Alex Tomasa86c6182006-10-11 01:21:03 -07004216 /*
Theodore Ts'oc2ea3fd2008-10-10 09:40:52 -04004217 * Okay, we need to do block allocation.
Andrew Morton63f57932006-10-11 01:21:24 -07004218 */
Aditya Kali7b415bf2011-09-09 19:04:51 -04004219 map->m_flags &= ~EXT4_MAP_FROM_CLUSTER;
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004220 newex.ee_block = cpu_to_le32(map->m_lblk);
4221 cluster_offset = map->m_lblk & (sbi->s_cluster_ratio-1);
4222
4223 /*
4224 * If we are doing bigalloc, check to see if the extent returned
4225 * by ext4_ext_find_extent() implies a cluster we can use.
4226 */
4227 if (cluster_offset && ex &&
Aditya Kalid8990242011-09-09 19:18:51 -04004228 get_implied_cluster_alloc(inode->i_sb, map, ex, path)) {
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004229 ar.len = allocated = map->m_len;
4230 newblock = map->m_pblk;
Aditya Kali7b415bf2011-09-09 19:04:51 -04004231 map->m_flags |= EXT4_MAP_FROM_CLUSTER;
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004232 goto got_allocated_blocks;
4233 }
Alex Tomasa86c6182006-10-11 01:21:03 -07004234
Alex Tomasc9de5602008-01-29 00:19:52 -05004235 /* find neighbour allocated blocks */
Theodore Ts'oe35fd662010-05-16 19:00:00 -04004236 ar.lleft = map->m_lblk;
Alex Tomasc9de5602008-01-29 00:19:52 -05004237 err = ext4_ext_search_left(inode, path, &ar.lleft, &ar.pleft);
4238 if (err)
4239 goto out2;
Theodore Ts'oe35fd662010-05-16 19:00:00 -04004240 ar.lright = map->m_lblk;
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004241 ex2 = NULL;
4242 err = ext4_ext_search_right(inode, path, &ar.lright, &ar.pright, &ex2);
Alex Tomasc9de5602008-01-29 00:19:52 -05004243 if (err)
4244 goto out2;
Amit Arora25d14f92007-05-24 13:04:13 -04004245
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004246 /* Check if the extent after searching to the right implies a
4247 * cluster we can use. */
4248 if ((sbi->s_cluster_ratio > 1) && ex2 &&
Aditya Kalid8990242011-09-09 19:18:51 -04004249 get_implied_cluster_alloc(inode->i_sb, map, ex2, path)) {
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004250 ar.len = allocated = map->m_len;
4251 newblock = map->m_pblk;
Aditya Kali7b415bf2011-09-09 19:04:51 -04004252 map->m_flags |= EXT4_MAP_FROM_CLUSTER;
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004253 goto got_allocated_blocks;
4254 }
4255
Amit Arora749269f2007-07-18 09:02:56 -04004256 /*
4257 * See if request is beyond maximum number of blocks we can have in
4258 * a single extent. For an initialized extent this limit is
4259 * EXT_INIT_MAX_LEN and for an uninitialized extent this limit is
4260 * EXT_UNINIT_MAX_LEN.
4261 */
Theodore Ts'oe35fd662010-05-16 19:00:00 -04004262 if (map->m_len > EXT_INIT_MAX_LEN &&
Theodore Ts'oc2177052009-05-14 00:58:52 -04004263 !(flags & EXT4_GET_BLOCKS_UNINIT_EXT))
Theodore Ts'oe35fd662010-05-16 19:00:00 -04004264 map->m_len = EXT_INIT_MAX_LEN;
4265 else if (map->m_len > EXT_UNINIT_MAX_LEN &&
Theodore Ts'oc2177052009-05-14 00:58:52 -04004266 (flags & EXT4_GET_BLOCKS_UNINIT_EXT))
Theodore Ts'oe35fd662010-05-16 19:00:00 -04004267 map->m_len = EXT_UNINIT_MAX_LEN;
Amit Arora749269f2007-07-18 09:02:56 -04004268
Theodore Ts'oe35fd662010-05-16 19:00:00 -04004269 /* Check if we can really insert (m_lblk)::(m_lblk + m_len) extent */
Theodore Ts'oe35fd662010-05-16 19:00:00 -04004270 newex.ee_len = cpu_to_le16(map->m_len);
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004271 err = ext4_ext_check_overlap(sbi, inode, &newex, path);
Amit Arora25d14f92007-05-24 13:04:13 -04004272 if (err)
Aneesh Kumar K.Vb939e372008-01-28 23:58:27 -05004273 allocated = ext4_ext_get_actual_len(&newex);
Amit Arora25d14f92007-05-24 13:04:13 -04004274 else
Theodore Ts'oe35fd662010-05-16 19:00:00 -04004275 allocated = map->m_len;
Alex Tomasc9de5602008-01-29 00:19:52 -05004276
4277 /* allocate new block */
4278 ar.inode = inode;
Theodore Ts'oe35fd662010-05-16 19:00:00 -04004279 ar.goal = ext4_ext_find_goal(inode, path, map->m_lblk);
4280 ar.logical = map->m_lblk;
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004281 /*
4282 * We calculate the offset from the beginning of the cluster
4283 * for the logical block number, since when we allocate a
4284 * physical cluster, the physical block should start at the
4285 * same offset from the beginning of the cluster. This is
4286 * needed so that future calls to get_implied_cluster_alloc()
4287 * work correctly.
4288 */
4289 offset = map->m_lblk & (sbi->s_cluster_ratio - 1);
4290 ar.len = EXT4_NUM_B2C(sbi, offset+allocated);
4291 ar.goal -= offset;
4292 ar.logical -= offset;
Alex Tomasc9de5602008-01-29 00:19:52 -05004293 if (S_ISREG(inode->i_mode))
4294 ar.flags = EXT4_MB_HINT_DATA;
4295 else
4296 /* disable in-core preallocation for non-regular files */
4297 ar.flags = 0;
Vivek Haldar556b27a2011-05-25 07:41:54 -04004298 if (flags & EXT4_GET_BLOCKS_NO_NORMALIZE)
4299 ar.flags |= EXT4_MB_HINT_NOPREALLOC;
Alex Tomasc9de5602008-01-29 00:19:52 -05004300 newblock = ext4_mb_new_blocks(handle, &ar, &err);
Alex Tomasa86c6182006-10-11 01:21:03 -07004301 if (!newblock)
4302 goto out2;
Mingming84fe3be2009-09-01 08:44:37 -04004303 ext_debug("allocate new block: goal %llu, found %llu/%u\n",
Theodore Ts'o498e5f22008-11-05 00:14:04 -05004304 ar.goal, newblock, allocated);
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004305 free_on_err = 1;
Aditya Kali7b415bf2011-09-09 19:04:51 -04004306 allocated_clusters = ar.len;
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004307 ar.len = EXT4_C2B(sbi, ar.len) - offset;
4308 if (ar.len > allocated)
4309 ar.len = allocated;
Alex Tomasa86c6182006-10-11 01:21:03 -07004310
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004311got_allocated_blocks:
Alex Tomasa86c6182006-10-11 01:21:03 -07004312 /* try to insert new extent into found leaf and return */
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004313 ext4_ext_store_pblock(&newex, newblock + offset);
Alex Tomasc9de5602008-01-29 00:19:52 -05004314 newex.ee_len = cpu_to_le16(ar.len);
Mingming Cao8d5d02e2009-09-28 15:48:29 -04004315 /* Mark uninitialized */
4316 if (flags & EXT4_GET_BLOCKS_UNINIT_EXT){
Amit Aroraa2df2a62007-07-17 21:42:41 -04004317 ext4_ext_mark_uninitialized(&newex);
Zheng Liua25a4e12013-02-18 00:28:04 -05004318 map->m_flags |= EXT4_MAP_UNWRITTEN;
Mingming Cao8d5d02e2009-09-28 15:48:29 -04004319 /*
Jiaying Zhang744692d2010-03-04 16:14:02 -05004320 * io_end structure was created for every IO write to an
Lucas De Marchi25985ed2011-03-30 22:57:33 -03004321 * uninitialized extent. To avoid unnecessary conversion,
Jiaying Zhang744692d2010-03-04 16:14:02 -05004322 * here we flag the IO that really needs the conversion.
Mingming5f524952009-11-10 10:48:04 -05004323 * For non asycn direct IO case, flag the inode state
Lucas De Marchi25985ed2011-03-30 22:57:33 -03004324 * that we need to perform conversion when IO is done.
Mingming Cao8d5d02e2009-09-28 15:48:29 -04004325 */
Dmitry Monakhov82e54222012-09-28 23:36:25 -04004326 if ((flags & EXT4_GET_BLOCKS_PRE_IO))
4327 set_unwritten = 1;
Jiaying Zhang744692d2010-03-04 16:14:02 -05004328 if (ext4_should_dioread_nolock(inode))
Theodore Ts'oe35fd662010-05-16 19:00:00 -04004329 map->m_flags |= EXT4_MAP_UNINIT;
Mingming Cao8d5d02e2009-09-28 15:48:29 -04004330 }
Jiaying Zhangc8d46e42010-02-24 09:52:53 -05004331
Dmitry Monakhova4e5d882011-10-25 08:15:12 -04004332 err = 0;
4333 if ((flags & EXT4_GET_BLOCKS_KEEP_SIZE) == 0)
4334 err = check_eofblocks_fl(handle, inode, map->m_lblk,
4335 path, ar.len);
Jiaying Zhang575a1d42011-07-10 20:07:25 -04004336 if (!err)
4337 err = ext4_ext_insert_extent(handle, inode, path,
4338 &newex, flags);
Dmitry Monakhov82e54222012-09-28 23:36:25 -04004339
4340 if (!err && set_unwritten) {
4341 if (io)
4342 ext4_set_io_unwritten_flag(inode, io);
4343 else
4344 ext4_set_inode_state(inode,
4345 EXT4_STATE_DIO_UNWRITTEN);
4346 }
4347
Theodore Ts'o4d33b1e2011-09-09 18:52:51 -04004348 if (err && free_on_err) {
Maxim Patlasov7132de72011-07-10 19:37:48 -04004349 int fb_flags = flags & EXT4_GET_BLOCKS_DELALLOC_RESERVE ?
4350 EXT4_FREE_BLOCKS_NO_QUOT_UPDATE : 0;
Alex Tomas315054f2007-05-24 13:04:25 -04004351 /* free data blocks we just allocated */
Alex Tomasc9de5602008-01-29 00:19:52 -05004352 /* not a good idea to call discard here directly,
4353 * but otherwise we'd need to call it every free() */
Theodore Ts'oc2ea3fd2008-10-10 09:40:52 -04004354 ext4_discard_preallocations(inode);
Theodore Ts'oc8e15132013-07-15 00:09:37 -04004355 ext4_free_blocks(handle, inode, NULL, newblock,
4356 EXT4_C2B(sbi, allocated_clusters), fb_flags);
Alex Tomasa86c6182006-10-11 01:21:03 -07004357 goto out2;
Alex Tomas315054f2007-05-24 13:04:25 -04004358 }
Alex Tomasa86c6182006-10-11 01:21:03 -07004359
Alex Tomasa86c6182006-10-11 01:21:03 -07004360 /* previous routine could use block we allocated */
Theodore Ts'obf89d162010-10-27 21:30:14 -04004361 newblock = ext4_ext_pblock(&newex);
Aneesh Kumar K.Vb939e372008-01-28 23:58:27 -05004362 allocated = ext4_ext_get_actual_len(&newex);
Theodore Ts'oe35fd662010-05-16 19:00:00 -04004363 if (allocated > map->m_len)
4364 allocated = map->m_len;
4365 map->m_flags |= EXT4_MAP_NEW;
Alex Tomasa86c6182006-10-11 01:21:03 -07004366
Jan Karab436b9b2009-12-08 23:51:10 -05004367 /*
Aneesh Kumar K.V5f634d02010-01-25 04:00:31 -05004368 * Update reserved blocks/metadata blocks after successful
4369 * block allocation which had been deferred till now.
4370 */
Aditya Kali7b415bf2011-09-09 19:04:51 -04004371 if (flags & EXT4_GET_BLOCKS_DELALLOC_RESERVE) {
Yongqiang Yang81fdbb42011-10-29 09:23:38 -04004372 unsigned int reserved_clusters;
Aditya Kali7b415bf2011-09-09 19:04:51 -04004373 /*
Yongqiang Yang81fdbb42011-10-29 09:23:38 -04004374 * Check how many clusters we had reserved this allocated range
Aditya Kali7b415bf2011-09-09 19:04:51 -04004375 */
4376 reserved_clusters = get_reserved_cluster_alloc(inode,
4377 map->m_lblk, allocated);
4378 if (map->m_flags & EXT4_MAP_FROM_CLUSTER) {
4379 if (reserved_clusters) {
4380 /*
4381 * We have clusters reserved for this range.
4382 * But since we are not doing actual allocation
4383 * and are simply using blocks from previously
4384 * allocated cluster, we should release the
4385 * reservation and not claim quota.
4386 */
4387 ext4_da_update_reserve_space(inode,
4388 reserved_clusters, 0);
4389 }
4390 } else {
4391 BUG_ON(allocated_clusters < reserved_clusters);
Aditya Kali7b415bf2011-09-09 19:04:51 -04004392 if (reserved_clusters < allocated_clusters) {
Aditya Kali5356f262011-09-09 19:20:51 -04004393 struct ext4_inode_info *ei = EXT4_I(inode);
Aditya Kali7b415bf2011-09-09 19:04:51 -04004394 int reservation = allocated_clusters -
4395 reserved_clusters;
4396 /*
4397 * It seems we claimed few clusters outside of
4398 * the range of this allocation. We should give
4399 * it back to the reservation pool. This can
4400 * happen in the following case:
4401 *
4402 * * Suppose s_cluster_ratio is 4 (i.e., each
4403 * cluster has 4 blocks. Thus, the clusters
4404 * are [0-3],[4-7],[8-11]...
4405 * * First comes delayed allocation write for
4406 * logical blocks 10 & 11. Since there were no
4407 * previous delayed allocated blocks in the
4408 * range [8-11], we would reserve 1 cluster
4409 * for this write.
4410 * * Next comes write for logical blocks 3 to 8.
4411 * In this case, we will reserve 2 clusters
4412 * (for [0-3] and [4-7]; and not for [8-11] as
4413 * that range has a delayed allocated blocks.
4414 * Thus total reserved clusters now becomes 3.
4415 * * Now, during the delayed allocation writeout
4416 * time, we will first write blocks [3-8] and
4417 * allocate 3 clusters for writing these
4418 * blocks. Also, we would claim all these
4419 * three clusters above.
4420 * * Now when we come here to writeout the
4421 * blocks [10-11], we would expect to claim
4422 * the reservation of 1 cluster we had made
4423 * (and we would claim it since there are no
4424 * more delayed allocated blocks in the range
4425 * [8-11]. But our reserved cluster count had
4426 * already gone to 0.
4427 *
4428 * Thus, at the step 4 above when we determine
4429 * that there are still some unwritten delayed
4430 * allocated blocks outside of our current
4431 * block range, we should increment the
4432 * reserved clusters count so that when the
4433 * remaining blocks finally gets written, we
4434 * could claim them.
4435 */
Aditya Kali5356f262011-09-09 19:20:51 -04004436 dquot_reserve_block(inode,
4437 EXT4_C2B(sbi, reservation));
4438 spin_lock(&ei->i_block_reservation_lock);
4439 ei->i_reserved_data_blocks += reservation;
4440 spin_unlock(&ei->i_block_reservation_lock);
Aditya Kali7b415bf2011-09-09 19:04:51 -04004441 }
Lukas Czerner232ec872013-03-10 22:46:30 -04004442 /*
4443 * We will claim quota for all newly allocated blocks.
4444 * We're updating the reserved space *after* the
4445 * correction above so we do not accidentally free
4446 * all the metadata reservation because we might
4447 * actually need it later on.
4448 */
4449 ext4_da_update_reserve_space(inode, allocated_clusters,
4450 1);
Aditya Kali7b415bf2011-09-09 19:04:51 -04004451 }
4452 }
Aneesh Kumar K.V5f634d02010-01-25 04:00:31 -05004453
4454 /*
Jan Karab436b9b2009-12-08 23:51:10 -05004455 * Cache the extent and update transaction to commit on fdatasync only
4456 * when it is _not_ an uninitialized extent.
4457 */
Zheng Liu69eb33d2013-02-18 00:31:07 -05004458 if ((flags & EXT4_GET_BLOCKS_UNINIT_EXT) == 0)
Jan Karab436b9b2009-12-08 23:51:10 -05004459 ext4_update_inode_fsync_trans(handle, inode, 1);
Zheng Liu69eb33d2013-02-18 00:31:07 -05004460 else
Jan Karab436b9b2009-12-08 23:51:10 -05004461 ext4_update_inode_fsync_trans(handle, inode, 0);
Alex Tomasa86c6182006-10-11 01:21:03 -07004462out:
Theodore Ts'oe35fd662010-05-16 19:00:00 -04004463 if (allocated > map->m_len)
4464 allocated = map->m_len;
Alex Tomasa86c6182006-10-11 01:21:03 -07004465 ext4_ext_show_leaf(inode, path);
Theodore Ts'oe35fd662010-05-16 19:00:00 -04004466 map->m_flags |= EXT4_MAP_MAPPED;
4467 map->m_pblk = newblock;
4468 map->m_len = allocated;
Alex Tomasa86c6182006-10-11 01:21:03 -07004469out2:
4470 if (path) {
4471 ext4_ext_drop_refs(path);
4472 kfree(path);
4473 }
Allison Hendersone8613042011-05-25 07:41:46 -04004474
Zheng Liu37794732012-11-08 14:47:52 -05004475out3:
Theodore Ts'o63b99962013-07-16 10:28:47 -04004476 trace_ext4_ext_map_blocks_exit(inode, flags, map,
4477 err ? err : allocated);
4478 ext4_es_lru_add(inode);
Lukas Czerner78771912012-03-19 23:05:43 -04004479 return err ? err : allocated;
Alex Tomasa86c6182006-10-11 01:21:03 -07004480}
4481
Theodore Ts'o819c4922013-04-03 12:47:17 -04004482void ext4_ext_truncate(handle_t *handle, struct inode *inode)
Alex Tomasa86c6182006-10-11 01:21:03 -07004483{
Alex Tomasa86c6182006-10-11 01:21:03 -07004484 struct super_block *sb = inode->i_sb;
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05004485 ext4_lblk_t last_block;
Alex Tomasa86c6182006-10-11 01:21:03 -07004486 int err = 0;
4487
4488 /*
Randy Dunlapd0d856e2006-10-11 01:21:07 -07004489 * TODO: optimization is possible here.
4490 * Probably we need not scan at all,
4491 * because page truncation is enough.
Alex Tomasa86c6182006-10-11 01:21:03 -07004492 */
Alex Tomasa86c6182006-10-11 01:21:03 -07004493
4494 /* we have to know where to truncate from in crash case */
4495 EXT4_I(inode)->i_disksize = inode->i_size;
4496 ext4_mark_inode_dirty(handle, inode);
4497
4498 last_block = (inode->i_size + sb->s_blocksize - 1)
4499 >> EXT4_BLOCK_SIZE_BITS(sb);
Theodore Ts'o8acd5e92013-07-15 00:09:19 -04004500retry:
Zheng Liu51865fd2012-11-08 21:57:32 -05004501 err = ext4_es_remove_extent(inode, last_block,
4502 EXT_MAX_BLOCKS - last_block);
Theodore Ts'o94eec0f2013-07-29 12:12:56 -04004503 if (err == -ENOMEM) {
Theodore Ts'o8acd5e92013-07-15 00:09:19 -04004504 cond_resched();
4505 congestion_wait(BLK_RW_ASYNC, HZ/50);
4506 goto retry;
4507 }
4508 if (err) {
4509 ext4_std_error(inode->i_sb, err);
4510 return;
4511 }
Lukas Czerner5f95d212012-03-19 23:03:19 -04004512 err = ext4_ext_remove_space(inode, last_block, EXT_MAX_BLOCKS - 1);
Theodore Ts'o8acd5e92013-07-15 00:09:19 -04004513 ext4_std_error(inode->i_sb, err);
Alex Tomasa86c6182006-10-11 01:21:03 -07004514}
4515
Aneesh Kumar K.Vfd287842008-04-29 08:11:12 -04004516static void ext4_falloc_update_inode(struct inode *inode,
4517 int mode, loff_t new_size, int update_ctime)
4518{
4519 struct timespec now;
4520
4521 if (update_ctime) {
4522 now = current_fs_time(inode->i_sb);
4523 if (!timespec_equal(&inode->i_ctime, &now))
4524 inode->i_ctime = now;
4525 }
4526 /*
4527 * Update only when preallocation was requested beyond
4528 * the file size.
4529 */
Aneesh Kumar K.Vcf17fea2008-09-13 13:06:18 -04004530 if (!(mode & FALLOC_FL_KEEP_SIZE)) {
4531 if (new_size > i_size_read(inode))
4532 i_size_write(inode, new_size);
4533 if (new_size > EXT4_I(inode)->i_disksize)
4534 ext4_update_i_disksize(inode, new_size);
Jiaying Zhangc8d46e42010-02-24 09:52:53 -05004535 } else {
4536 /*
4537 * Mark that we allocate beyond EOF so the subsequent truncate
4538 * can proceed even if the new size is the same as i_size.
4539 */
4540 if (new_size > i_size_read(inode))
Dmitry Monakhov12e9b892010-05-16 22:00:00 -04004541 ext4_set_inode_flag(inode, EXT4_INODE_EOFBLOCKS);
Aneesh Kumar K.Vfd287842008-04-29 08:11:12 -04004542 }
4543
4544}
4545
Amit Aroraa2df2a62007-07-17 21:42:41 -04004546/*
Christoph Hellwig2fe17c12011-01-14 13:07:43 +01004547 * preallocate space for a file. This implements ext4's fallocate file
Amit Aroraa2df2a62007-07-17 21:42:41 -04004548 * operation, which gets called from sys_fallocate system call.
4549 * For block-mapped files, posix_fallocate should fall back to the method
4550 * of writing zeroes to the required new blocks (the same behavior which is
4551 * expected for file systems which do not support fallocate() system call).
4552 */
Christoph Hellwig2fe17c12011-01-14 13:07:43 +01004553long ext4_fallocate(struct file *file, int mode, loff_t offset, loff_t len)
Amit Aroraa2df2a62007-07-17 21:42:41 -04004554{
Al Viro496ad9a2013-01-23 17:07:38 -05004555 struct inode *inode = file_inode(file);
Amit Aroraa2df2a62007-07-17 21:42:41 -04004556 handle_t *handle;
Aneesh Kumar K.Vfd287842008-04-29 08:11:12 -04004557 loff_t new_size;
Theodore Ts'o498e5f22008-11-05 00:14:04 -05004558 unsigned int max_blocks;
Amit Aroraa2df2a62007-07-17 21:42:41 -04004559 int ret = 0;
4560 int ret2 = 0;
4561 int retries = 0;
Dmitry Monakhova4e5d882011-10-25 08:15:12 -04004562 int flags;
Theodore Ts'o2ed88682010-05-16 20:00:00 -04004563 struct ext4_map_blocks map;
Amit Aroraa2df2a62007-07-17 21:42:41 -04004564 unsigned int credits, blkbits = inode->i_blkbits;
4565
Allison Hendersona4bb6b62011-05-25 07:41:50 -04004566 /* Return error if mode is not supported */
4567 if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))
4568 return -EOPNOTSUPP;
4569
4570 if (mode & FALLOC_FL_PUNCH_HOLE)
Ashish Sangwanaeb28172013-07-01 08:12:38 -04004571 return ext4_punch_hole(inode, offset, len);
Allison Hendersona4bb6b62011-05-25 07:41:50 -04004572
Tao Ma0c8d4142012-12-10 14:06:03 -05004573 ret = ext4_convert_inline_data(inode);
4574 if (ret)
4575 return ret;
4576
Zheng Liu8bad6fc2013-01-28 09:21:37 -05004577 /*
4578 * currently supporting (pre)allocate mode for extent-based
4579 * files _only_
4580 */
4581 if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)))
4582 return -EOPNOTSUPP;
4583
Jiaying Zhang0562e0b2011-03-21 21:38:05 -04004584 trace_ext4_fallocate_enter(inode, offset, len, mode);
Theodore Ts'o2ed88682010-05-16 20:00:00 -04004585 map.m_lblk = offset >> blkbits;
Aneesh Kumar K.Vfd287842008-04-29 08:11:12 -04004586 /*
4587 * We can't just convert len to max_blocks because
4588 * If blocksize = 4096 offset = 3072 and len = 2048
4589 */
Amit Aroraa2df2a62007-07-17 21:42:41 -04004590 max_blocks = (EXT4_BLOCK_ALIGN(len + offset, blkbits) >> blkbits)
Theodore Ts'o2ed88682010-05-16 20:00:00 -04004591 - map.m_lblk;
Amit Aroraa2df2a62007-07-17 21:42:41 -04004592 /*
Mingming Caof3bd1f32008-08-19 22:16:03 -04004593 * credits to insert 1 extent into extent tree
Amit Aroraa2df2a62007-07-17 21:42:41 -04004594 */
Mingming Caof3bd1f32008-08-19 22:16:03 -04004595 credits = ext4_chunk_trans_blocks(inode, max_blocks);
Aneesh Kumar K.V55bd7252008-02-15 12:47:21 -05004596 mutex_lock(&inode->i_mutex);
Nikanth Karthikesan6d19c422010-05-16 14:00:00 -04004597 ret = inode_newsize_ok(inode, (len + offset));
4598 if (ret) {
4599 mutex_unlock(&inode->i_mutex);
Jiaying Zhang0562e0b2011-03-21 21:38:05 -04004600 trace_ext4_fallocate_exit(inode, offset, max_blocks, ret);
Nikanth Karthikesan6d19c422010-05-16 14:00:00 -04004601 return ret;
4602 }
Greg Harm3c6fe772011-10-31 18:41:47 -04004603 flags = EXT4_GET_BLOCKS_CREATE_UNINIT_EXT;
Dmitry Monakhova4e5d882011-10-25 08:15:12 -04004604 if (mode & FALLOC_FL_KEEP_SIZE)
4605 flags |= EXT4_GET_BLOCKS_KEEP_SIZE;
Greg Harm3c6fe772011-10-31 18:41:47 -04004606 /*
4607 * Don't normalize the request if it can fit in one extent so
4608 * that it doesn't get unnecessarily split into multiple
4609 * extents.
4610 */
4611 if (len <= EXT_UNINIT_MAX_LEN << blkbits)
4612 flags |= EXT4_GET_BLOCKS_NO_NORMALIZE;
Dmitry Monakhov60d46162012-10-05 11:32:02 -04004613
Amit Aroraa2df2a62007-07-17 21:42:41 -04004614retry:
4615 while (ret >= 0 && ret < max_blocks) {
Theodore Ts'o2ed88682010-05-16 20:00:00 -04004616 map.m_lblk = map.m_lblk + ret;
4617 map.m_len = max_blocks = max_blocks - ret;
Theodore Ts'o9924a922013-02-08 21:59:22 -05004618 handle = ext4_journal_start(inode, EXT4_HT_MAP_BLOCKS,
4619 credits);
Amit Aroraa2df2a62007-07-17 21:42:41 -04004620 if (IS_ERR(handle)) {
4621 ret = PTR_ERR(handle);
4622 break;
4623 }
Dmitry Monakhova4e5d882011-10-25 08:15:12 -04004624 ret = ext4_map_blocks(handle, inode, &map, flags);
Aneesh Kumar K.V221879c2008-01-28 23:58:27 -05004625 if (ret <= 0) {
Aneesh Kumar K.V2c986152008-02-25 15:41:35 -05004626#ifdef EXT4FS_DEBUG
Lukas Czernerb06acd32013-01-28 21:21:12 -05004627 ext4_warning(inode->i_sb,
4628 "inode #%lu: block %u: len %u: "
4629 "ext4_ext_map_blocks returned %d",
4630 inode->i_ino, map.m_lblk,
4631 map.m_len, ret);
Aneesh Kumar K.V2c986152008-02-25 15:41:35 -05004632#endif
Amit Aroraa2df2a62007-07-17 21:42:41 -04004633 ext4_mark_inode_dirty(handle, inode);
4634 ret2 = ext4_journal_stop(handle);
4635 break;
4636 }
Theodore Ts'o2ed88682010-05-16 20:00:00 -04004637 if ((map.m_lblk + ret) >= (EXT4_BLOCK_ALIGN(offset + len,
Aneesh Kumar K.Vfd287842008-04-29 08:11:12 -04004638 blkbits) >> blkbits))
4639 new_size = offset + len;
4640 else
Utako Kusaka29ae07b2011-07-27 22:11:20 -04004641 new_size = ((loff_t) map.m_lblk + ret) << blkbits;
Amit Aroraa2df2a62007-07-17 21:42:41 -04004642
Aneesh Kumar K.Vfd287842008-04-29 08:11:12 -04004643 ext4_falloc_update_inode(inode, mode, new_size,
Theodore Ts'o2ed88682010-05-16 20:00:00 -04004644 (map.m_flags & EXT4_MAP_NEW));
Amit Aroraa2df2a62007-07-17 21:42:41 -04004645 ext4_mark_inode_dirty(handle, inode);
Zheng Liuf4e95b32012-06-30 19:12:57 -04004646 if ((file->f_flags & O_SYNC) && ret >= max_blocks)
4647 ext4_handle_sync(handle);
Amit Aroraa2df2a62007-07-17 21:42:41 -04004648 ret2 = ext4_journal_stop(handle);
4649 if (ret2)
4650 break;
4651 }
Aneesh Kumar K.Vfd287842008-04-29 08:11:12 -04004652 if (ret == -ENOSPC &&
4653 ext4_should_retry_alloc(inode->i_sb, &retries)) {
4654 ret = 0;
Amit Aroraa2df2a62007-07-17 21:42:41 -04004655 goto retry;
Amit Aroraa2df2a62007-07-17 21:42:41 -04004656 }
Aneesh Kumar K.V55bd7252008-02-15 12:47:21 -05004657 mutex_unlock(&inode->i_mutex);
Jiaying Zhang0562e0b2011-03-21 21:38:05 -04004658 trace_ext4_fallocate_exit(inode, offset, max_blocks,
4659 ret > 0 ? ret2 : ret);
Amit Aroraa2df2a62007-07-17 21:42:41 -04004660 return ret > 0 ? ret2 : ret;
4661}
Eric Sandeen6873fa02008-10-07 00:46:36 -04004662
4663/*
Mingming Cao00314622009-09-28 15:49:08 -04004664 * This function convert a range of blocks to written extents
4665 * The caller of this function will pass the start offset and the size.
4666 * all unwritten extents within this range will be converted to
4667 * written extents.
4668 *
4669 * This function is called from the direct IO end io call back
4670 * function, to convert the fallocated extents after IO is completed.
Mingming109f5562009-11-10 10:48:08 -05004671 * Returns 0 on success.
Mingming Cao00314622009-09-28 15:49:08 -04004672 */
Jan Kara6b523df2013-06-04 13:21:11 -04004673int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode,
4674 loff_t offset, ssize_t len)
Mingming Cao00314622009-09-28 15:49:08 -04004675{
Mingming Cao00314622009-09-28 15:49:08 -04004676 unsigned int max_blocks;
4677 int ret = 0;
4678 int ret2 = 0;
Theodore Ts'o2ed88682010-05-16 20:00:00 -04004679 struct ext4_map_blocks map;
Mingming Cao00314622009-09-28 15:49:08 -04004680 unsigned int credits, blkbits = inode->i_blkbits;
4681
Theodore Ts'o2ed88682010-05-16 20:00:00 -04004682 map.m_lblk = offset >> blkbits;
Mingming Cao00314622009-09-28 15:49:08 -04004683 /*
4684 * We can't just convert len to max_blocks because
4685 * If blocksize = 4096 offset = 3072 and len = 2048
4686 */
Theodore Ts'o2ed88682010-05-16 20:00:00 -04004687 max_blocks = ((EXT4_BLOCK_ALIGN(len + offset, blkbits) >> blkbits) -
4688 map.m_lblk);
Mingming Cao00314622009-09-28 15:49:08 -04004689 /*
Jan Kara6b523df2013-06-04 13:21:11 -04004690 * This is somewhat ugly but the idea is clear: When transaction is
4691 * reserved, everything goes into it. Otherwise we rather start several
4692 * smaller transactions for conversion of each extent separately.
Mingming Cao00314622009-09-28 15:49:08 -04004693 */
Jan Kara6b523df2013-06-04 13:21:11 -04004694 if (handle) {
4695 handle = ext4_journal_start_reserved(handle,
4696 EXT4_HT_EXT_CONVERT);
4697 if (IS_ERR(handle))
4698 return PTR_ERR(handle);
4699 credits = 0;
4700 } else {
4701 /*
4702 * credits to insert 1 extent into extent tree
4703 */
4704 credits = ext4_chunk_trans_blocks(inode, max_blocks);
4705 }
Mingming Cao00314622009-09-28 15:49:08 -04004706 while (ret >= 0 && ret < max_blocks) {
Theodore Ts'o2ed88682010-05-16 20:00:00 -04004707 map.m_lblk += ret;
4708 map.m_len = (max_blocks -= ret);
Jan Kara6b523df2013-06-04 13:21:11 -04004709 if (credits) {
4710 handle = ext4_journal_start(inode, EXT4_HT_MAP_BLOCKS,
4711 credits);
4712 if (IS_ERR(handle)) {
4713 ret = PTR_ERR(handle);
4714 break;
4715 }
Mingming Cao00314622009-09-28 15:49:08 -04004716 }
Theodore Ts'o2ed88682010-05-16 20:00:00 -04004717 ret = ext4_map_blocks(handle, inode, &map,
Jiaying Zhangc7064ef2010-03-02 13:28:44 -05004718 EXT4_GET_BLOCKS_IO_CONVERT_EXT);
Lukas Czernerb06acd32013-01-28 21:21:12 -05004719 if (ret <= 0)
4720 ext4_warning(inode->i_sb,
4721 "inode #%lu: block %u: len %u: "
4722 "ext4_ext_map_blocks returned %d",
4723 inode->i_ino, map.m_lblk,
4724 map.m_len, ret);
Mingming Cao00314622009-09-28 15:49:08 -04004725 ext4_mark_inode_dirty(handle, inode);
Jan Kara6b523df2013-06-04 13:21:11 -04004726 if (credits)
4727 ret2 = ext4_journal_stop(handle);
4728 if (ret <= 0 || ret2)
Mingming Cao00314622009-09-28 15:49:08 -04004729 break;
4730 }
Jan Kara6b523df2013-06-04 13:21:11 -04004731 if (!credits)
4732 ret2 = ext4_journal_stop(handle);
Mingming Cao00314622009-09-28 15:49:08 -04004733 return ret > 0 ? ret2 : ret;
4734}
Yongqiang Yang6d9c85e2011-02-27 17:25:47 -05004735
Mingming Cao00314622009-09-28 15:49:08 -04004736/*
Zheng Liu69eb33d2013-02-18 00:31:07 -05004737 * If newes is not existing extent (newes->ec_pblk equals zero) find
4738 * delayed extent at start of newes and update newes accordingly and
Lukas Czerner91dd8c12012-11-28 12:32:26 -05004739 * return start of the next delayed extent.
4740 *
Zheng Liu69eb33d2013-02-18 00:31:07 -05004741 * If newes is existing extent (newes->ec_pblk is not equal zero)
Lukas Czerner91dd8c12012-11-28 12:32:26 -05004742 * return start of next delayed extent or EXT_MAX_BLOCKS if no delayed
Zheng Liu69eb33d2013-02-18 00:31:07 -05004743 * extent found. Leave newes unmodified.
Eric Sandeen6873fa02008-10-07 00:46:36 -04004744 */
Lukas Czerner91dd8c12012-11-28 12:32:26 -05004745static int ext4_find_delayed_extent(struct inode *inode,
Zheng Liu69eb33d2013-02-18 00:31:07 -05004746 struct extent_status *newes)
Eric Sandeen6873fa02008-10-07 00:46:36 -04004747{
Zheng Liub3aff3e2012-11-08 21:57:37 -05004748 struct extent_status es;
Zheng Liube401362013-02-18 00:27:26 -05004749 ext4_lblk_t block, next_del;
Eric Sandeen6873fa02008-10-07 00:46:36 -04004750
Zheng Liu69eb33d2013-02-18 00:31:07 -05004751 if (newes->es_pblk == 0) {
Yan, Zhenge30b5dc2013-05-03 02:15:52 -04004752 ext4_es_find_delayed_extent_range(inode, newes->es_lblk,
4753 newes->es_lblk + newes->es_len - 1, &es);
4754
Yongqiang Yang6d9c85e2011-02-27 17:25:47 -05004755 /*
Zheng Liu69eb33d2013-02-18 00:31:07 -05004756 * No extent in extent-tree contains block @newes->es_pblk,
Yongqiang Yang6d9c85e2011-02-27 17:25:47 -05004757 * then the block may stay in 1)a hole or 2)delayed-extent.
Yongqiang Yang6d9c85e2011-02-27 17:25:47 -05004758 */
Zheng Liu06b0c882013-02-18 00:26:51 -05004759 if (es.es_len == 0)
Zheng Liub3aff3e2012-11-08 21:57:37 -05004760 /* A hole found. */
Lukas Czerner91dd8c12012-11-28 12:32:26 -05004761 return 0;
Yongqiang Yang6d9c85e2011-02-27 17:25:47 -05004762
Zheng Liu69eb33d2013-02-18 00:31:07 -05004763 if (es.es_lblk > newes->es_lblk) {
Zheng Liub3aff3e2012-11-08 21:57:37 -05004764 /* A hole found. */
Zheng Liu69eb33d2013-02-18 00:31:07 -05004765 newes->es_len = min(es.es_lblk - newes->es_lblk,
4766 newes->es_len);
Lukas Czerner91dd8c12012-11-28 12:32:26 -05004767 return 0;
Eric Sandeen6873fa02008-10-07 00:46:36 -04004768 }
Yongqiang Yang6d9c85e2011-02-27 17:25:47 -05004769
Zheng Liu69eb33d2013-02-18 00:31:07 -05004770 newes->es_len = es.es_lblk + es.es_len - newes->es_lblk;
Eric Sandeen6873fa02008-10-07 00:46:36 -04004771 }
4772
Zheng Liu69eb33d2013-02-18 00:31:07 -05004773 block = newes->es_lblk + newes->es_len;
Yan, Zhenge30b5dc2013-05-03 02:15:52 -04004774 ext4_es_find_delayed_extent_range(inode, block, EXT_MAX_BLOCKS, &es);
Zheng Liube401362013-02-18 00:27:26 -05004775 if (es.es_len == 0)
4776 next_del = EXT_MAX_BLOCKS;
4777 else
4778 next_del = es.es_lblk;
4779
Lukas Czerner91dd8c12012-11-28 12:32:26 -05004780 return next_del;
Eric Sandeen6873fa02008-10-07 00:46:36 -04004781}
Eric Sandeen6873fa02008-10-07 00:46:36 -04004782/* fiemap flags we can handle specified here */
4783#define EXT4_FIEMAP_FLAGS (FIEMAP_FLAG_SYNC|FIEMAP_FLAG_XATTR)
4784
Aneesh Kumar K.V3a06d772008-11-22 15:04:59 -05004785static int ext4_xattr_fiemap(struct inode *inode,
4786 struct fiemap_extent_info *fieinfo)
Eric Sandeen6873fa02008-10-07 00:46:36 -04004787{
4788 __u64 physical = 0;
4789 __u64 length;
4790 __u32 flags = FIEMAP_EXTENT_LAST;
4791 int blockbits = inode->i_sb->s_blocksize_bits;
4792 int error = 0;
4793
4794 /* in-inode? */
Theodore Ts'o19f5fb72010-01-24 14:34:07 -05004795 if (ext4_test_inode_state(inode, EXT4_STATE_XATTR)) {
Eric Sandeen6873fa02008-10-07 00:46:36 -04004796 struct ext4_iloc iloc;
4797 int offset; /* offset of xattr in inode */
4798
4799 error = ext4_get_inode_loc(inode, &iloc);
4800 if (error)
4801 return error;
Jan Karaa60697f2013-05-31 19:38:56 -04004802 physical = (__u64)iloc.bh->b_blocknr << blockbits;
Eric Sandeen6873fa02008-10-07 00:46:36 -04004803 offset = EXT4_GOOD_OLD_INODE_SIZE +
4804 EXT4_I(inode)->i_extra_isize;
4805 physical += offset;
4806 length = EXT4_SB(inode->i_sb)->s_inode_size - offset;
4807 flags |= FIEMAP_EXTENT_DATA_INLINE;
Curt Wohlgemuthfd2dd9f2010-04-03 17:44:16 -04004808 brelse(iloc.bh);
Eric Sandeen6873fa02008-10-07 00:46:36 -04004809 } else { /* external block */
Jan Karaa60697f2013-05-31 19:38:56 -04004810 physical = (__u64)EXT4_I(inode)->i_file_acl << blockbits;
Eric Sandeen6873fa02008-10-07 00:46:36 -04004811 length = inode->i_sb->s_blocksize;
4812 }
4813
4814 if (physical)
4815 error = fiemap_fill_next_extent(fieinfo, 0, physical,
4816 length, flags);
4817 return (error < 0 ? error : 0);
4818}
4819
4820int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
4821 __u64 start, __u64 len)
4822{
4823 ext4_lblk_t start_blk;
Eric Sandeen6873fa02008-10-07 00:46:36 -04004824 int error = 0;
4825
Tao Ma94191982012-12-10 14:06:02 -05004826 if (ext4_has_inline_data(inode)) {
4827 int has_inline = 1;
4828
4829 error = ext4_inline_data_fiemap(inode, fieinfo, &has_inline);
4830
4831 if (has_inline)
4832 return error;
4833 }
4834
Theodore Ts'o7869a4a2013-08-16 22:05:14 -04004835 if (fieinfo->fi_flags & FIEMAP_FLAG_CACHE) {
4836 error = ext4_ext_precache(inode);
4837 if (error)
4838 return error;
4839 }
4840
Eric Sandeen6873fa02008-10-07 00:46:36 -04004841 /* fallback to generic here if not in extents fmt */
Dmitry Monakhov12e9b892010-05-16 22:00:00 -04004842 if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)))
Eric Sandeen6873fa02008-10-07 00:46:36 -04004843 return generic_block_fiemap(inode, fieinfo, start, len,
4844 ext4_get_block);
4845
4846 if (fiemap_check_flags(fieinfo, EXT4_FIEMAP_FLAGS))
4847 return -EBADR;
4848
4849 if (fieinfo->fi_flags & FIEMAP_FLAG_XATTR) {
4850 error = ext4_xattr_fiemap(inode, fieinfo);
4851 } else {
Leonard Michlmayraca92ff2010-03-04 17:07:28 -05004852 ext4_lblk_t len_blks;
4853 __u64 last_blk;
4854
Eric Sandeen6873fa02008-10-07 00:46:36 -04004855 start_blk = start >> inode->i_sb->s_blocksize_bits;
Leonard Michlmayraca92ff2010-03-04 17:07:28 -05004856 last_blk = (start + len - 1) >> inode->i_sb->s_blocksize_bits;
Lukas Czernerf17722f2011-06-06 00:05:17 -04004857 if (last_blk >= EXT_MAX_BLOCKS)
4858 last_blk = EXT_MAX_BLOCKS-1;
Leonard Michlmayraca92ff2010-03-04 17:07:28 -05004859 len_blks = ((ext4_lblk_t) last_blk) - start_blk + 1;
Eric Sandeen6873fa02008-10-07 00:46:36 -04004860
4861 /*
Lukas Czerner91dd8c12012-11-28 12:32:26 -05004862 * Walk the extent tree gathering extent information
4863 * and pushing extents back to the user.
Eric Sandeen6873fa02008-10-07 00:46:36 -04004864 */
Lukas Czerner91dd8c12012-11-28 12:32:26 -05004865 error = ext4_fill_fiemap_extents(inode, start_blk,
4866 len_blks, fieinfo);
Eric Sandeen6873fa02008-10-07 00:46:36 -04004867 }
Theodore Ts'o107a7bd2013-08-16 21:23:41 -04004868 ext4_es_lru_add(inode);
Eric Sandeen6873fa02008-10-07 00:46:36 -04004869 return error;
4870}