blob: 734abca25e359bc4b21f3e8b67674cc9c320698a [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 }
78 retval = ext4_ext_insert_extent(handle, inode, path, &newext);
79err_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 */
241 needed = 3 + 2*EXT4_QUOTA_TRANS_BLOCKS(inode->i_sb);
242
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);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500265 ext4_free_blocks(handle, inode,
Alex Tomasc9de5602008-01-29 00:19:52 -0500266 le32_to_cpu(tmp_idata[i]), 1, 1);
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500267 }
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500268 }
269 put_bh(bh);
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500270 extend_credit_for_blkdel(handle, inode);
Alex Tomasc9de5602008-01-29 00:19:52 -0500271 ext4_free_blocks(handle, inode, le32_to_cpu(i_data), 1, 1);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500272 return 0;
273}
274
275static int free_tind_blocks(handle_t *handle,
276 struct inode *inode, __le32 i_data)
277{
278 int i, retval = 0;
279 __le32 *tmp_idata;
280 struct buffer_head *bh;
281 unsigned long max_entries = inode->i_sb->s_blocksize >> 2;
282
283 bh = sb_bread(inode->i_sb, le32_to_cpu(i_data));
284 if (!bh)
285 return -EIO;
286
287 tmp_idata = (__le32 *)bh->b_data;
288 for (i = 0; i < max_entries; i++) {
289 if (tmp_idata[i]) {
290 retval = free_dind_blocks(handle,
291 inode, tmp_idata[i]);
292 if (retval) {
293 put_bh(bh);
294 return retval;
295 }
296 }
297 }
298 put_bh(bh);
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500299 extend_credit_for_blkdel(handle, inode);
Alex Tomasc9de5602008-01-29 00:19:52 -0500300 ext4_free_blocks(handle, inode, le32_to_cpu(i_data), 1, 1);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500301 return 0;
302}
303
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500304static int free_ind_block(handle_t *handle, struct inode *inode, __le32 *i_data)
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500305{
306 int retval;
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500307
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500308 /* ei->i_data[EXT4_IND_BLOCK] */
309 if (i_data[0]) {
310 extend_credit_for_blkdel(handle, inode);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500311 ext4_free_blocks(handle, inode,
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500312 le32_to_cpu(i_data[0]), 1, 1);
313 }
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500314
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500315 /* ei->i_data[EXT4_DIND_BLOCK] */
316 if (i_data[1]) {
317 retval = free_dind_blocks(handle, inode, i_data[1]);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500318 if (retval)
319 return retval;
320 }
321
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500322 /* ei->i_data[EXT4_TIND_BLOCK] */
323 if (i_data[2]) {
324 retval = free_tind_blocks(handle, inode, i_data[2]);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500325 if (retval)
326 return retval;
327 }
328 return 0;
329}
330
331static int ext4_ext_swap_inode_data(handle_t *handle, struct inode *inode,
Aneesh Kumar K.V267e4db2008-04-29 08:11:12 -0400332 struct inode *tmp_inode)
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500333{
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500334 int retval;
335 __le32 i_data[3];
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500336 struct ext4_inode_info *ei = EXT4_I(inode);
337 struct ext4_inode_info *tmp_ei = EXT4_I(tmp_inode);
338
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500339 /*
340 * One credit accounted for writing the
341 * i_data field of the original inode
342 */
343 retval = ext4_journal_extend(handle, 1);
Aneesh Kumar K.V267e4db2008-04-29 08:11:12 -0400344 if (retval) {
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500345 retval = ext4_journal_restart(handle, 1);
346 if (retval)
347 goto err_out;
348 }
349
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500350 i_data[0] = ei->i_data[EXT4_IND_BLOCK];
351 i_data[1] = ei->i_data[EXT4_DIND_BLOCK];
352 i_data[2] = ei->i_data[EXT4_TIND_BLOCK];
353
354 down_write(&EXT4_I(inode)->i_data_sem);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500355 /*
Aneesh Kumar K.V267e4db2008-04-29 08:11:12 -0400356 * if EXT4_EXT_MIGRATE is cleared a block allocation
357 * happened after we started the migrate. We need to
358 * fail the migrate
359 */
360 if (!(EXT4_I(inode)->i_flags & EXT4_EXT_MIGRATE)) {
361 retval = -EAGAIN;
362 up_write(&EXT4_I(inode)->i_data_sem);
363 goto err_out;
364 } else
365 EXT4_I(inode)->i_flags = EXT4_I(inode)->i_flags &
366 ~EXT4_EXT_MIGRATE;
367 /*
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500368 * We have the extent map build with the tmp inode.
369 * Now copy the i_data across
370 */
371 ei->i_flags |= EXT4_EXTENTS_FL;
372 memcpy(ei->i_data, tmp_ei->i_data, sizeof(ei->i_data));
373
374 /*
375 * Update i_blocks with the new blocks that got
376 * allocated while adding extents for extent index
377 * blocks.
378 *
379 * While converting to extents we need not
380 * update the orignal inode i_blocks for extent blocks
381 * via quota APIs. The quota update happened via tmp_inode already.
382 */
383 spin_lock(&inode->i_lock);
384 inode->i_blocks += tmp_inode->i_blocks;
385 spin_unlock(&inode->i_lock);
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500386 up_write(&EXT4_I(inode)->i_data_sem);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500387
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500388 /*
389 * We mark the inode dirty after, because we decrement the
390 * i_blocks when freeing the indirect meta-data blocks
391 */
392 retval = free_ind_block(handle, inode, i_data);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500393 ext4_mark_inode_dirty(handle, inode);
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500394
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500395err_out:
396 return retval;
397}
398
399static int free_ext_idx(handle_t *handle, struct inode *inode,
400 struct ext4_extent_idx *ix)
401{
402 int i, retval = 0;
403 ext4_fsblk_t block;
404 struct buffer_head *bh;
405 struct ext4_extent_header *eh;
406
407 block = idx_pblock(ix);
408 bh = sb_bread(inode->i_sb, block);
409 if (!bh)
410 return -EIO;
411
412 eh = (struct ext4_extent_header *)bh->b_data;
413 if (eh->eh_depth != 0) {
414 ix = EXT_FIRST_INDEX(eh);
415 for (i = 0; i < le16_to_cpu(eh->eh_entries); i++, ix++) {
416 retval = free_ext_idx(handle, inode, ix);
417 if (retval)
418 break;
419 }
420 }
421 put_bh(bh);
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500422 extend_credit_for_blkdel(handle, inode);
Alex Tomasc9de5602008-01-29 00:19:52 -0500423 ext4_free_blocks(handle, inode, block, 1, 1);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500424 return retval;
425}
426
427/*
428 * Free the extent meta data blocks only
429 */
430static int free_ext_block(handle_t *handle, struct inode *inode)
431{
432 int i, retval = 0;
433 struct ext4_inode_info *ei = EXT4_I(inode);
434 struct ext4_extent_header *eh = (struct ext4_extent_header *)ei->i_data;
435 struct ext4_extent_idx *ix;
436 if (eh->eh_depth == 0)
437 /*
438 * No extra blocks allocated for extent meta data
439 */
440 return 0;
441 ix = EXT_FIRST_INDEX(eh);
442 for (i = 0; i < le16_to_cpu(eh->eh_entries); i++, ix++) {
443 retval = free_ext_idx(handle, inode, ix);
444 if (retval)
445 return retval;
446 }
447 return retval;
448
449}
450
Aneesh Kumar K.V2a43a872008-09-13 12:52:26 -0400451int ext4_ext_migrate(struct inode *inode)
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500452{
453 handle_t *handle;
454 int retval = 0, i;
455 __le32 *i_data;
456 ext4_lblk_t blk_count = 0;
457 struct ext4_inode_info *ei;
458 struct inode *tmp_inode = NULL;
459 struct list_blocks_struct lb;
460 unsigned long max_entries;
461
Theodore Ts'o83982b62009-01-06 14:53:16 -0500462 /*
463 * If the filesystem does not support extents, or the inode
464 * already is extent-based, error out.
465 */
466 if (!EXT4_HAS_INCOMPAT_FEATURE(inode->i_sb,
467 EXT4_FEATURE_INCOMPAT_EXTENTS) ||
468 (EXT4_I(inode)->i_flags & EXT4_EXTENTS_FL))
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500469 return -EINVAL;
470
Valerie Clementb8356c42008-02-05 10:56:37 -0500471 if (S_ISLNK(inode->i_mode) && inode->i_blocks == 0)
472 /*
473 * don't migrate fast symlink
474 */
475 return retval;
476
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500477 handle = ext4_journal_start(inode,
478 EXT4_DATA_TRANS_BLOCKS(inode->i_sb) +
479 EXT4_INDEX_EXTRA_TRANS_BLOCKS + 3 +
480 2 * EXT4_QUOTA_INIT_BLOCKS(inode->i_sb)
481 + 1);
482 if (IS_ERR(handle)) {
483 retval = PTR_ERR(handle);
484 goto err_out;
485 }
486 tmp_inode = ext4_new_inode(handle,
487 inode->i_sb->s_root->d_inode,
488 S_IFREG);
489 if (IS_ERR(tmp_inode)) {
490 retval = -ENOMEM;
491 ext4_journal_stop(handle);
492 tmp_inode = NULL;
493 goto err_out;
494 }
495 i_size_write(tmp_inode, i_size_read(inode));
496 /*
497 * We don't want the inode to be reclaimed
498 * if we got interrupted in between. We have
499 * this tmp inode carrying reference to the
500 * data blocks of the original file. We set
501 * the i_nlink to zero at the last stage after
502 * switching the original file to extent format
503 */
504 tmp_inode->i_nlink = 1;
505
506 ext4_ext_tree_init(handle, tmp_inode);
507 ext4_orphan_add(handle, tmp_inode);
508 ext4_journal_stop(handle);
509
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500510 /*
511 * start with one credit accounted for
512 * superblock modification.
513 *
514 * For the tmp_inode we already have commited the
515 * trascation that created the inode. Later as and
516 * when we add extents we extent the journal
517 */
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500518 /*
Aneesh Kumar K.V267e4db2008-04-29 08:11:12 -0400519 * Even though we take i_mutex we can still cause block allocation
520 * via mmap write to holes. If we have allocated new blocks we fail
521 * migrate. New block allocation will clear EXT4_EXT_MIGRATE flag.
522 * The flag is updated with i_data_sem held to prevent racing with
523 * block allocation.
524 */
525 down_read((&EXT4_I(inode)->i_data_sem));
526 EXT4_I(inode)->i_flags = EXT4_I(inode)->i_flags | EXT4_EXT_MIGRATE;
527 up_read((&EXT4_I(inode)->i_data_sem));
528
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500529 handle = ext4_journal_start(inode, 1);
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500530
531 ei = EXT4_I(inode);
532 i_data = ei->i_data;
533 memset(&lb, 0, sizeof(lb));
534
535 /* 32 bit block address 4 bytes */
536 max_entries = inode->i_sb->s_blocksize >> 2;
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500537 for (i = 0; i < EXT4_NDIR_BLOCKS; i++, blk_count++) {
538 if (i_data[i]) {
539 retval = update_extent_range(handle, tmp_inode,
540 le32_to_cpu(i_data[i]),
541 blk_count, &lb);
542 if (retval)
543 goto err_out;
544 }
545 }
546 if (i_data[EXT4_IND_BLOCK]) {
547 retval = update_ind_extent_range(handle, tmp_inode,
548 le32_to_cpu(i_data[EXT4_IND_BLOCK]),
549 &blk_count, &lb);
550 if (retval)
551 goto err_out;
552 } else
553 blk_count += max_entries;
554 if (i_data[EXT4_DIND_BLOCK]) {
555 retval = update_dind_extent_range(handle, tmp_inode,
556 le32_to_cpu(i_data[EXT4_DIND_BLOCK]),
557 &blk_count, &lb);
558 if (retval)
559 goto err_out;
560 } else
561 blk_count += max_entries * max_entries;
562 if (i_data[EXT4_TIND_BLOCK]) {
563 retval = update_tind_extent_range(handle, tmp_inode,
564 le32_to_cpu(i_data[EXT4_TIND_BLOCK]),
565 &blk_count, &lb);
566 if (retval)
567 goto err_out;
568 }
569 /*
570 * Build the last extent
571 */
572 retval = finish_range(handle, tmp_inode, &lb);
573err_out:
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500574 if (retval)
575 /*
576 * Failure case delete the extent information with the
577 * tmp_inode
578 */
579 free_ext_block(handle, tmp_inode);
Aneesh Kumar K.V267e4db2008-04-29 08:11:12 -0400580 else {
581 retval = ext4_ext_swap_inode_data(handle, inode, tmp_inode);
582 if (retval)
583 /*
584 * if we fail to swap inode data free the extent
585 * details of the tmp inode
586 */
587 free_ext_block(handle, tmp_inode);
588 }
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500589
590 /* We mark the tmp_inode dirty via ext4_ext_tree_init. */
591 if (ext4_journal_extend(handle, 1) != 0)
592 ext4_journal_restart(handle, 1);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500593
594 /*
595 * Mark the tmp_inode as of size zero
596 */
597 i_size_write(tmp_inode, 0);
598
599 /*
600 * set the i_blocks count to zero
601 * so that the ext4_delete_inode does the
602 * right job
603 *
604 * We don't need to take the i_lock because
605 * the inode is not visible to user space.
606 */
607 tmp_inode->i_blocks = 0;
608
609 /* Reset the extent details */
610 ext4_ext_tree_init(handle, tmp_inode);
611
612 /*
613 * Set the i_nlink to zero so that
614 * generic_drop_inode really deletes the
615 * inode
616 */
617 tmp_inode->i_nlink = 0;
618
619 ext4_journal_stop(handle);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500620
621 if (tmp_inode)
622 iput(tmp_inode);
623
624 return retval;
625}