blob: 81415814b00b06a0455402078cd41588a615a701 [file] [log] [blame]
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -05001/*
2 * Copyright IBM Corporation, 2007
3 * Author Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of version 2.1 of the GNU Lesser General Public License
7 * as published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it would be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
12 *
13 */
14
15#include <linux/module.h>
Christoph Hellwig3dcf5452008-04-29 18:13:32 -040016#include "ext4_jbd2.h"
17#include "ext4_extents.h"
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -050018
19/*
20 * The contiguous blocks details which can be
21 * represented by a single extent
22 */
23struct list_blocks_struct {
24 ext4_lblk_t first_block, last_block;
25 ext4_fsblk_t first_pblock, last_pblock;
26};
27
28static int finish_range(handle_t *handle, struct inode *inode,
29 struct list_blocks_struct *lb)
30
31{
32 int retval = 0, needed;
33 struct ext4_extent newext;
34 struct ext4_ext_path *path;
35 if (lb->first_pblock == 0)
36 return 0;
37
38 /* Add the extent to temp inode*/
39 newext.ee_block = cpu_to_le32(lb->first_block);
40 newext.ee_len = cpu_to_le16(lb->last_block - lb->first_block + 1);
41 ext4_ext_store_pblock(&newext, lb->first_pblock);
42 path = ext4_ext_find_extent(inode, lb->first_block, NULL);
43
44 if (IS_ERR(path)) {
45 retval = PTR_ERR(path);
Aneesh Kumar K.Vb35905c2008-02-25 16:54:37 -050046 path = NULL;
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -050047 goto err_out;
48 }
49
50 /*
51 * Calculate the credit needed to inserting this extent
52 * Since we are doing this in loop we may accumalate extra
53 * credit. But below we try to not accumalate too much
54 * of them by restarting the journal.
55 */
Mingming Caoee12b632008-08-19 22:16:05 -040056 needed = ext4_ext_calc_credits_for_single_extent(inode,
57 lb->last_block - lb->first_block + 1, path);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -050058
59 /*
60 * Make sure the credit we accumalated is not really high
61 */
Frank Mayhar03901312009-01-07 00:06:22 -050062 if (needed && ext4_handle_has_enough_credits(handle,
63 EXT4_RESERVE_TRANS_BLOCKS)) {
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -050064 retval = ext4_journal_restart(handle, needed);
65 if (retval)
66 goto err_out;
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -050067 } else if (needed) {
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -050068 retval = ext4_journal_extend(handle, needed);
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -050069 if (retval) {
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -050070 /*
71 * IF not able to extend the journal restart the journal
72 */
73 retval = ext4_journal_restart(handle, needed);
74 if (retval)
75 goto err_out;
76 }
77 }
Mingming Cao00314622009-09-28 15:49:08 -040078 retval = ext4_ext_insert_extent(handle, inode, path, &newext, 0);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -050079err_out:
Aneesh Kumar K.Vb35905c2008-02-25 16:54:37 -050080 if (path) {
81 ext4_ext_drop_refs(path);
82 kfree(path);
83 }
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -050084 lb->first_pblock = 0;
85 return retval;
86}
87
88static int update_extent_range(handle_t *handle, struct inode *inode,
89 ext4_fsblk_t pblock, ext4_lblk_t blk_num,
90 struct list_blocks_struct *lb)
91{
92 int retval;
93 /*
94 * See if we can add on to the existing range (if it exists)
95 */
96 if (lb->first_pblock &&
97 (lb->last_pblock+1 == pblock) &&
98 (lb->last_block+1 == blk_num)) {
99 lb->last_pblock = pblock;
100 lb->last_block = blk_num;
101 return 0;
102 }
103 /*
104 * Start a new range.
105 */
106 retval = finish_range(handle, inode, lb);
107 lb->first_pblock = lb->last_pblock = pblock;
108 lb->first_block = lb->last_block = blk_num;
109
110 return retval;
111}
112
113static int update_ind_extent_range(handle_t *handle, struct inode *inode,
114 ext4_fsblk_t pblock, ext4_lblk_t *blk_nump,
115 struct list_blocks_struct *lb)
116{
117 struct buffer_head *bh;
118 __le32 *i_data;
119 int i, retval = 0;
120 ext4_lblk_t blk_count = *blk_nump;
121 unsigned long max_entries = inode->i_sb->s_blocksize >> 2;
122
123 if (!pblock) {
124 /* Only update the file block number */
125 *blk_nump += max_entries;
126 return 0;
127 }
128
129 bh = sb_bread(inode->i_sb, pblock);
130 if (!bh)
131 return -EIO;
132
133 i_data = (__le32 *)bh->b_data;
134 for (i = 0; i < max_entries; i++, blk_count++) {
135 if (i_data[i]) {
136 retval = update_extent_range(handle, inode,
137 le32_to_cpu(i_data[i]),
138 blk_count, lb);
139 if (retval)
140 break;
141 }
142 }
143
144 /* Update the file block number */
145 *blk_nump = blk_count;
146 put_bh(bh);
147 return retval;
148
149}
150
151static int update_dind_extent_range(handle_t *handle, struct inode *inode,
152 ext4_fsblk_t pblock, ext4_lblk_t *blk_nump,
153 struct list_blocks_struct *lb)
154{
155 struct buffer_head *bh;
156 __le32 *i_data;
157 int i, retval = 0;
158 ext4_lblk_t blk_count = *blk_nump;
159 unsigned long max_entries = inode->i_sb->s_blocksize >> 2;
160
161 if (!pblock) {
162 /* Only update the file block number */
163 *blk_nump += max_entries * max_entries;
164 return 0;
165 }
166 bh = sb_bread(inode->i_sb, pblock);
167 if (!bh)
168 return -EIO;
169
170 i_data = (__le32 *)bh->b_data;
171 for (i = 0; i < max_entries; i++) {
172 if (i_data[i]) {
173 retval = update_ind_extent_range(handle, inode,
174 le32_to_cpu(i_data[i]),
175 &blk_count, lb);
176 if (retval)
177 break;
178 } else {
179 /* Only update the file block number */
180 blk_count += max_entries;
181 }
182 }
183
184 /* Update the file block number */
185 *blk_nump = blk_count;
186 put_bh(bh);
187 return retval;
188
189}
190
191static int update_tind_extent_range(handle_t *handle, struct inode *inode,
192 ext4_fsblk_t pblock, ext4_lblk_t *blk_nump,
193 struct list_blocks_struct *lb)
194{
195 struct buffer_head *bh;
196 __le32 *i_data;
197 int i, retval = 0;
198 ext4_lblk_t blk_count = *blk_nump;
199 unsigned long max_entries = inode->i_sb->s_blocksize >> 2;
200
201 if (!pblock) {
202 /* Only update the file block number */
203 *blk_nump += max_entries * max_entries * max_entries;
204 return 0;
205 }
206 bh = sb_bread(inode->i_sb, pblock);
207 if (!bh)
208 return -EIO;
209
210 i_data = (__le32 *)bh->b_data;
211 for (i = 0; i < max_entries; i++) {
212 if (i_data[i]) {
213 retval = update_dind_extent_range(handle, inode,
214 le32_to_cpu(i_data[i]),
215 &blk_count, lb);
216 if (retval)
217 break;
218 } else
219 /* Only update the file block number */
220 blk_count += max_entries * max_entries;
221 }
222 /* Update the file block number */
223 *blk_nump = blk_count;
224 put_bh(bh);
225 return retval;
226
227}
228
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500229static int extend_credit_for_blkdel(handle_t *handle, struct inode *inode)
230{
231 int retval = 0, needed;
232
Frank Mayhar03901312009-01-07 00:06:22 -0500233 if (ext4_handle_has_enough_credits(handle, EXT4_RESERVE_TRANS_BLOCKS+1))
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500234 return 0;
235 /*
236 * We are freeing a blocks. During this we touch
237 * superblock, group descriptor and block bitmap.
238 * So allocate a credit of 3. We may update
239 * quota (user and group).
240 */
Dmitry Monakhov5aca07e2009-12-08 22:42:15 -0500241 needed = 3 + EXT4_MAXQUOTAS_TRANS_BLOCKS(inode->i_sb);
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500242
243 if (ext4_journal_extend(handle, needed) != 0)
244 retval = ext4_journal_restart(handle, needed);
245
246 return retval;
247}
248
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500249static int free_dind_blocks(handle_t *handle,
250 struct inode *inode, __le32 i_data)
251{
252 int i;
253 __le32 *tmp_idata;
254 struct buffer_head *bh;
255 unsigned long max_entries = inode->i_sb->s_blocksize >> 2;
256
257 bh = sb_bread(inode->i_sb, le32_to_cpu(i_data));
258 if (!bh)
259 return -EIO;
260
261 tmp_idata = (__le32 *)bh->b_data;
262 for (i = 0; i < max_entries; i++) {
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500263 if (tmp_idata[i]) {
264 extend_credit_for_blkdel(handle, inode);
Theodore Ts'oe6362602009-11-23 07:17:05 -0500265 ext4_free_blocks(handle, inode, 0,
266 le32_to_cpu(tmp_idata[i]), 1,
267 EXT4_FREE_BLOCKS_METADATA |
268 EXT4_FREE_BLOCKS_FORGET);
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500269 }
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500270 }
271 put_bh(bh);
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500272 extend_credit_for_blkdel(handle, inode);
Theodore Ts'oe6362602009-11-23 07:17:05 -0500273 ext4_free_blocks(handle, inode, 0, le32_to_cpu(i_data), 1,
274 EXT4_FREE_BLOCKS_METADATA |
275 EXT4_FREE_BLOCKS_FORGET);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500276 return 0;
277}
278
279static int free_tind_blocks(handle_t *handle,
280 struct inode *inode, __le32 i_data)
281{
282 int i, retval = 0;
283 __le32 *tmp_idata;
284 struct buffer_head *bh;
285 unsigned long max_entries = inode->i_sb->s_blocksize >> 2;
286
287 bh = sb_bread(inode->i_sb, le32_to_cpu(i_data));
288 if (!bh)
289 return -EIO;
290
291 tmp_idata = (__le32 *)bh->b_data;
292 for (i = 0; i < max_entries; i++) {
293 if (tmp_idata[i]) {
294 retval = free_dind_blocks(handle,
295 inode, tmp_idata[i]);
296 if (retval) {
297 put_bh(bh);
298 return retval;
299 }
300 }
301 }
302 put_bh(bh);
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500303 extend_credit_for_blkdel(handle, inode);
Theodore Ts'oe6362602009-11-23 07:17:05 -0500304 ext4_free_blocks(handle, inode, 0, le32_to_cpu(i_data), 1,
305 EXT4_FREE_BLOCKS_METADATA |
306 EXT4_FREE_BLOCKS_FORGET);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500307 return 0;
308}
309
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500310static int free_ind_block(handle_t *handle, struct inode *inode, __le32 *i_data)
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500311{
312 int retval;
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500313
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500314 /* ei->i_data[EXT4_IND_BLOCK] */
315 if (i_data[0]) {
316 extend_credit_for_blkdel(handle, inode);
Theodore Ts'oe6362602009-11-23 07:17:05 -0500317 ext4_free_blocks(handle, inode, 0,
318 le32_to_cpu(i_data[0]), 1,
319 EXT4_FREE_BLOCKS_METADATA |
320 EXT4_FREE_BLOCKS_FORGET);
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500321 }
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500322
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500323 /* ei->i_data[EXT4_DIND_BLOCK] */
324 if (i_data[1]) {
325 retval = free_dind_blocks(handle, inode, i_data[1]);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500326 if (retval)
327 return retval;
328 }
329
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500330 /* ei->i_data[EXT4_TIND_BLOCK] */
331 if (i_data[2]) {
332 retval = free_tind_blocks(handle, inode, i_data[2]);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500333 if (retval)
334 return retval;
335 }
336 return 0;
337}
338
339static int ext4_ext_swap_inode_data(handle_t *handle, struct inode *inode,
Aneesh Kumar K.V267e4db2008-04-29 08:11:12 -0400340 struct inode *tmp_inode)
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500341{
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500342 int retval;
343 __le32 i_data[3];
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500344 struct ext4_inode_info *ei = EXT4_I(inode);
345 struct ext4_inode_info *tmp_ei = EXT4_I(tmp_inode);
346
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500347 /*
348 * One credit accounted for writing the
349 * i_data field of the original inode
350 */
351 retval = ext4_journal_extend(handle, 1);
Aneesh Kumar K.V267e4db2008-04-29 08:11:12 -0400352 if (retval) {
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500353 retval = ext4_journal_restart(handle, 1);
354 if (retval)
355 goto err_out;
356 }
357
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500358 i_data[0] = ei->i_data[EXT4_IND_BLOCK];
359 i_data[1] = ei->i_data[EXT4_DIND_BLOCK];
360 i_data[2] = ei->i_data[EXT4_TIND_BLOCK];
361
362 down_write(&EXT4_I(inode)->i_data_sem);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500363 /*
Theodore Ts'o1b9c12f2009-09-17 08:32:22 -0400364 * if EXT4_STATE_EXT_MIGRATE is cleared a block allocation
Aneesh Kumar K.V267e4db2008-04-29 08:11:12 -0400365 * happened after we started the migrate. We need to
366 * fail the migrate
367 */
Theodore Ts'o1b9c12f2009-09-17 08:32:22 -0400368 if (!(EXT4_I(inode)->i_state & EXT4_STATE_EXT_MIGRATE)) {
Aneesh Kumar K.V267e4db2008-04-29 08:11:12 -0400369 retval = -EAGAIN;
370 up_write(&EXT4_I(inode)->i_data_sem);
371 goto err_out;
372 } else
Theodore Ts'o1b9c12f2009-09-17 08:32:22 -0400373 EXT4_I(inode)->i_state &= ~EXT4_STATE_EXT_MIGRATE;
Aneesh Kumar K.V267e4db2008-04-29 08:11:12 -0400374 /*
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500375 * We have the extent map build with the tmp inode.
376 * Now copy the i_data across
377 */
378 ei->i_flags |= EXT4_EXTENTS_FL;
379 memcpy(ei->i_data, tmp_ei->i_data, sizeof(ei->i_data));
380
381 /*
382 * Update i_blocks with the new blocks that got
383 * allocated while adding extents for extent index
384 * blocks.
385 *
386 * While converting to extents we need not
387 * update the orignal inode i_blocks for extent blocks
388 * via quota APIs. The quota update happened via tmp_inode already.
389 */
390 spin_lock(&inode->i_lock);
391 inode->i_blocks += tmp_inode->i_blocks;
392 spin_unlock(&inode->i_lock);
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500393 up_write(&EXT4_I(inode)->i_data_sem);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500394
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500395 /*
396 * We mark the inode dirty after, because we decrement the
397 * i_blocks when freeing the indirect meta-data blocks
398 */
399 retval = free_ind_block(handle, inode, i_data);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500400 ext4_mark_inode_dirty(handle, inode);
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500401
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500402err_out:
403 return retval;
404}
405
406static int free_ext_idx(handle_t *handle, struct inode *inode,
407 struct ext4_extent_idx *ix)
408{
409 int i, retval = 0;
410 ext4_fsblk_t block;
411 struct buffer_head *bh;
412 struct ext4_extent_header *eh;
413
414 block = idx_pblock(ix);
415 bh = sb_bread(inode->i_sb, block);
416 if (!bh)
417 return -EIO;
418
419 eh = (struct ext4_extent_header *)bh->b_data;
420 if (eh->eh_depth != 0) {
421 ix = EXT_FIRST_INDEX(eh);
422 for (i = 0; i < le16_to_cpu(eh->eh_entries); i++, ix++) {
423 retval = free_ext_idx(handle, inode, ix);
424 if (retval)
425 break;
426 }
427 }
428 put_bh(bh);
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500429 extend_credit_for_blkdel(handle, inode);
Theodore Ts'oe6362602009-11-23 07:17:05 -0500430 ext4_free_blocks(handle, inode, 0, block, 1,
431 EXT4_FREE_BLOCKS_METADATA | EXT4_FREE_BLOCKS_FORGET);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500432 return retval;
433}
434
435/*
436 * Free the extent meta data blocks only
437 */
438static int free_ext_block(handle_t *handle, struct inode *inode)
439{
440 int i, retval = 0;
441 struct ext4_inode_info *ei = EXT4_I(inode);
442 struct ext4_extent_header *eh = (struct ext4_extent_header *)ei->i_data;
443 struct ext4_extent_idx *ix;
444 if (eh->eh_depth == 0)
445 /*
446 * No extra blocks allocated for extent meta data
447 */
448 return 0;
449 ix = EXT_FIRST_INDEX(eh);
450 for (i = 0; i < le16_to_cpu(eh->eh_entries); i++, ix++) {
451 retval = free_ext_idx(handle, inode, ix);
452 if (retval)
453 return retval;
454 }
455 return retval;
456
457}
458
Aneesh Kumar K.V2a43a872008-09-13 12:52:26 -0400459int ext4_ext_migrate(struct inode *inode)
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500460{
461 handle_t *handle;
462 int retval = 0, i;
463 __le32 *i_data;
464 ext4_lblk_t blk_count = 0;
465 struct ext4_inode_info *ei;
466 struct inode *tmp_inode = NULL;
467 struct list_blocks_struct lb;
468 unsigned long max_entries;
Andreas Dilger11013912009-06-13 11:45:35 -0400469 __u32 goal;
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500470
Theodore Ts'o83982b62009-01-06 14:53:16 -0500471 /*
472 * If the filesystem does not support extents, or the inode
473 * already is extent-based, error out.
474 */
475 if (!EXT4_HAS_INCOMPAT_FEATURE(inode->i_sb,
476 EXT4_FEATURE_INCOMPAT_EXTENTS) ||
477 (EXT4_I(inode)->i_flags & EXT4_EXTENTS_FL))
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500478 return -EINVAL;
479
Valerie Clementb8356c42008-02-05 10:56:37 -0500480 if (S_ISLNK(inode->i_mode) && inode->i_blocks == 0)
481 /*
482 * don't migrate fast symlink
483 */
484 return retval;
485
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500486 handle = ext4_journal_start(inode,
487 EXT4_DATA_TRANS_BLOCKS(inode->i_sb) +
488 EXT4_INDEX_EXTRA_TRANS_BLOCKS + 3 +
Dmitry Monakhov5aca07e2009-12-08 22:42:15 -0500489 EXT4_MAXQUOTAS_INIT_BLOCKS(inode->i_sb)
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500490 + 1);
491 if (IS_ERR(handle)) {
492 retval = PTR_ERR(handle);
Dan Carpenter09054262009-02-15 20:02:19 -0500493 return retval;
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500494 }
Andreas Dilger11013912009-06-13 11:45:35 -0400495 goal = (((inode->i_ino - 1) / EXT4_INODES_PER_GROUP(inode->i_sb)) *
496 EXT4_INODES_PER_GROUP(inode->i_sb)) + 1;
Theodore Ts'of157a4a2009-06-13 11:09:42 -0400497 tmp_inode = ext4_new_inode(handle, inode->i_sb->s_root->d_inode,
Andreas Dilger11013912009-06-13 11:45:35 -0400498 S_IFREG, 0, goal);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500499 if (IS_ERR(tmp_inode)) {
500 retval = -ENOMEM;
501 ext4_journal_stop(handle);
Dan Carpenter09054262009-02-15 20:02:19 -0500502 return retval;
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500503 }
504 i_size_write(tmp_inode, i_size_read(inode));
505 /*
506 * We don't want the inode to be reclaimed
507 * if we got interrupted in between. We have
508 * this tmp inode carrying reference to the
509 * data blocks of the original file. We set
510 * the i_nlink to zero at the last stage after
511 * switching the original file to extent format
512 */
513 tmp_inode->i_nlink = 1;
514
515 ext4_ext_tree_init(handle, tmp_inode);
516 ext4_orphan_add(handle, tmp_inode);
517 ext4_journal_stop(handle);
518
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500519 /*
520 * start with one credit accounted for
521 * superblock modification.
522 *
523 * For the tmp_inode we already have commited the
524 * trascation that created the inode. Later as and
525 * when we add extents we extent the journal
526 */
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500527 /*
Theodore Ts'o1b9c12f2009-09-17 08:32:22 -0400528 * Even though we take i_mutex we can still cause block
529 * allocation via mmap write to holes. If we have allocated
530 * new blocks we fail migrate. New block allocation will
531 * clear EXT4_STATE_EXT_MIGRATE flag. The flag is updated
532 * with i_data_sem held to prevent racing with block
533 * allocation.
Aneesh Kumar K.V267e4db2008-04-29 08:11:12 -0400534 */
535 down_read((&EXT4_I(inode)->i_data_sem));
Theodore Ts'o1b9c12f2009-09-17 08:32:22 -0400536 EXT4_I(inode)->i_state |= EXT4_STATE_EXT_MIGRATE;
Aneesh Kumar K.V267e4db2008-04-29 08:11:12 -0400537 up_read((&EXT4_I(inode)->i_data_sem));
538
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500539 handle = ext4_journal_start(inode, 1);
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500540
541 ei = EXT4_I(inode);
542 i_data = ei->i_data;
543 memset(&lb, 0, sizeof(lb));
544
545 /* 32 bit block address 4 bytes */
546 max_entries = inode->i_sb->s_blocksize >> 2;
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500547 for (i = 0; i < EXT4_NDIR_BLOCKS; i++, blk_count++) {
548 if (i_data[i]) {
549 retval = update_extent_range(handle, tmp_inode,
550 le32_to_cpu(i_data[i]),
551 blk_count, &lb);
552 if (retval)
553 goto err_out;
554 }
555 }
556 if (i_data[EXT4_IND_BLOCK]) {
557 retval = update_ind_extent_range(handle, tmp_inode,
558 le32_to_cpu(i_data[EXT4_IND_BLOCK]),
559 &blk_count, &lb);
560 if (retval)
561 goto err_out;
562 } else
563 blk_count += max_entries;
564 if (i_data[EXT4_DIND_BLOCK]) {
565 retval = update_dind_extent_range(handle, tmp_inode,
566 le32_to_cpu(i_data[EXT4_DIND_BLOCK]),
567 &blk_count, &lb);
568 if (retval)
569 goto err_out;
570 } else
571 blk_count += max_entries * max_entries;
572 if (i_data[EXT4_TIND_BLOCK]) {
573 retval = update_tind_extent_range(handle, tmp_inode,
574 le32_to_cpu(i_data[EXT4_TIND_BLOCK]),
575 &blk_count, &lb);
576 if (retval)
577 goto err_out;
578 }
579 /*
580 * Build the last extent
581 */
582 retval = finish_range(handle, tmp_inode, &lb);
583err_out:
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500584 if (retval)
585 /*
586 * Failure case delete the extent information with the
587 * tmp_inode
588 */
589 free_ext_block(handle, tmp_inode);
Aneesh Kumar K.V267e4db2008-04-29 08:11:12 -0400590 else {
591 retval = ext4_ext_swap_inode_data(handle, inode, tmp_inode);
592 if (retval)
593 /*
594 * if we fail to swap inode data free the extent
595 * details of the tmp inode
596 */
597 free_ext_block(handle, tmp_inode);
598 }
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500599
600 /* We mark the tmp_inode dirty via ext4_ext_tree_init. */
601 if (ext4_journal_extend(handle, 1) != 0)
602 ext4_journal_restart(handle, 1);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500603
604 /*
605 * Mark the tmp_inode as of size zero
606 */
607 i_size_write(tmp_inode, 0);
608
609 /*
610 * set the i_blocks count to zero
611 * so that the ext4_delete_inode does the
612 * right job
613 *
614 * We don't need to take the i_lock because
615 * the inode is not visible to user space.
616 */
617 tmp_inode->i_blocks = 0;
618
619 /* Reset the extent details */
620 ext4_ext_tree_init(handle, tmp_inode);
621
622 /*
623 * Set the i_nlink to zero so that
624 * generic_drop_inode really deletes the
625 * inode
626 */
627 tmp_inode->i_nlink = 0;
628
629 ext4_journal_stop(handle);
Aneesh Kumar K.Va8526e82009-08-25 22:36:05 -0400630 unlock_new_inode(tmp_inode);
Dan Carpenter09054262009-02-15 20:02:19 -0500631 iput(tmp_inode);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500632
633 return retval;
634}