blob: b9e077ba07e94b0c979ebea4530e1fc9471e6eee [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 */
56 needed = ext4_ext_calc_credits_for_insert(inode, path);
57
58 /*
59 * Make sure the credit we accumalated is not really high
60 */
61 if (needed && handle->h_buffer_credits >= EXT4_RESERVE_TRANS_BLOCKS) {
62 retval = ext4_journal_restart(handle, needed);
63 if (retval)
64 goto err_out;
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -050065 } else if (needed) {
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -050066 retval = ext4_journal_extend(handle, needed);
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -050067 if (retval) {
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -050068 /*
69 * IF not able to extend the journal restart the journal
70 */
71 retval = ext4_journal_restart(handle, needed);
72 if (retval)
73 goto err_out;
74 }
75 }
76 retval = ext4_ext_insert_extent(handle, inode, path, &newext);
77err_out:
Aneesh Kumar K.Vb35905c2008-02-25 16:54:37 -050078 if (path) {
79 ext4_ext_drop_refs(path);
80 kfree(path);
81 }
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -050082 lb->first_pblock = 0;
83 return retval;
84}
85
86static int update_extent_range(handle_t *handle, struct inode *inode,
87 ext4_fsblk_t pblock, ext4_lblk_t blk_num,
88 struct list_blocks_struct *lb)
89{
90 int retval;
91 /*
92 * See if we can add on to the existing range (if it exists)
93 */
94 if (lb->first_pblock &&
95 (lb->last_pblock+1 == pblock) &&
96 (lb->last_block+1 == blk_num)) {
97 lb->last_pblock = pblock;
98 lb->last_block = blk_num;
99 return 0;
100 }
101 /*
102 * Start a new range.
103 */
104 retval = finish_range(handle, inode, lb);
105 lb->first_pblock = lb->last_pblock = pblock;
106 lb->first_block = lb->last_block = blk_num;
107
108 return retval;
109}
110
111static int update_ind_extent_range(handle_t *handle, struct inode *inode,
112 ext4_fsblk_t pblock, ext4_lblk_t *blk_nump,
113 struct list_blocks_struct *lb)
114{
115 struct buffer_head *bh;
116 __le32 *i_data;
117 int i, retval = 0;
118 ext4_lblk_t blk_count = *blk_nump;
119 unsigned long max_entries = inode->i_sb->s_blocksize >> 2;
120
121 if (!pblock) {
122 /* Only update the file block number */
123 *blk_nump += max_entries;
124 return 0;
125 }
126
127 bh = sb_bread(inode->i_sb, pblock);
128 if (!bh)
129 return -EIO;
130
131 i_data = (__le32 *)bh->b_data;
132 for (i = 0; i < max_entries; i++, blk_count++) {
133 if (i_data[i]) {
134 retval = update_extent_range(handle, inode,
135 le32_to_cpu(i_data[i]),
136 blk_count, lb);
137 if (retval)
138 break;
139 }
140 }
141
142 /* Update the file block number */
143 *blk_nump = blk_count;
144 put_bh(bh);
145 return retval;
146
147}
148
149static int update_dind_extent_range(handle_t *handle, struct inode *inode,
150 ext4_fsblk_t pblock, ext4_lblk_t *blk_nump,
151 struct list_blocks_struct *lb)
152{
153 struct buffer_head *bh;
154 __le32 *i_data;
155 int i, retval = 0;
156 ext4_lblk_t blk_count = *blk_nump;
157 unsigned long max_entries = inode->i_sb->s_blocksize >> 2;
158
159 if (!pblock) {
160 /* Only update the file block number */
161 *blk_nump += max_entries * max_entries;
162 return 0;
163 }
164 bh = sb_bread(inode->i_sb, pblock);
165 if (!bh)
166 return -EIO;
167
168 i_data = (__le32 *)bh->b_data;
169 for (i = 0; i < max_entries; i++) {
170 if (i_data[i]) {
171 retval = update_ind_extent_range(handle, inode,
172 le32_to_cpu(i_data[i]),
173 &blk_count, lb);
174 if (retval)
175 break;
176 } else {
177 /* Only update the file block number */
178 blk_count += max_entries;
179 }
180 }
181
182 /* Update the file block number */
183 *blk_nump = blk_count;
184 put_bh(bh);
185 return retval;
186
187}
188
189static int update_tind_extent_range(handle_t *handle, struct inode *inode,
190 ext4_fsblk_t pblock, ext4_lblk_t *blk_nump,
191 struct list_blocks_struct *lb)
192{
193 struct buffer_head *bh;
194 __le32 *i_data;
195 int i, retval = 0;
196 ext4_lblk_t blk_count = *blk_nump;
197 unsigned long max_entries = inode->i_sb->s_blocksize >> 2;
198
199 if (!pblock) {
200 /* Only update the file block number */
201 *blk_nump += max_entries * max_entries * max_entries;
202 return 0;
203 }
204 bh = sb_bread(inode->i_sb, pblock);
205 if (!bh)
206 return -EIO;
207
208 i_data = (__le32 *)bh->b_data;
209 for (i = 0; i < max_entries; i++) {
210 if (i_data[i]) {
211 retval = update_dind_extent_range(handle, inode,
212 le32_to_cpu(i_data[i]),
213 &blk_count, lb);
214 if (retval)
215 break;
216 } else
217 /* Only update the file block number */
218 blk_count += max_entries * max_entries;
219 }
220 /* Update the file block number */
221 *blk_nump = blk_count;
222 put_bh(bh);
223 return retval;
224
225}
226
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500227static int extend_credit_for_blkdel(handle_t *handle, struct inode *inode)
228{
229 int retval = 0, needed;
230
231 if (handle->h_buffer_credits > EXT4_RESERVE_TRANS_BLOCKS)
232 return 0;
233 /*
234 * We are freeing a blocks. During this we touch
235 * superblock, group descriptor and block bitmap.
236 * So allocate a credit of 3. We may update
237 * quota (user and group).
238 */
239 needed = 3 + 2*EXT4_QUOTA_TRANS_BLOCKS(inode->i_sb);
240
241 if (ext4_journal_extend(handle, needed) != 0)
242 retval = ext4_journal_restart(handle, needed);
243
244 return retval;
245}
246
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500247static int free_dind_blocks(handle_t *handle,
248 struct inode *inode, __le32 i_data)
249{
250 int i;
251 __le32 *tmp_idata;
252 struct buffer_head *bh;
253 unsigned long max_entries = inode->i_sb->s_blocksize >> 2;
254
255 bh = sb_bread(inode->i_sb, le32_to_cpu(i_data));
256 if (!bh)
257 return -EIO;
258
259 tmp_idata = (__le32 *)bh->b_data;
260 for (i = 0; i < max_entries; i++) {
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500261 if (tmp_idata[i]) {
262 extend_credit_for_blkdel(handle, inode);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500263 ext4_free_blocks(handle, inode,
Alex Tomasc9de5602008-01-29 00:19:52 -0500264 le32_to_cpu(tmp_idata[i]), 1, 1);
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500265 }
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500266 }
267 put_bh(bh);
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500268 extend_credit_for_blkdel(handle, inode);
Alex Tomasc9de5602008-01-29 00:19:52 -0500269 ext4_free_blocks(handle, inode, le32_to_cpu(i_data), 1, 1);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500270 return 0;
271}
272
273static int free_tind_blocks(handle_t *handle,
274 struct inode *inode, __le32 i_data)
275{
276 int i, retval = 0;
277 __le32 *tmp_idata;
278 struct buffer_head *bh;
279 unsigned long max_entries = inode->i_sb->s_blocksize >> 2;
280
281 bh = sb_bread(inode->i_sb, le32_to_cpu(i_data));
282 if (!bh)
283 return -EIO;
284
285 tmp_idata = (__le32 *)bh->b_data;
286 for (i = 0; i < max_entries; i++) {
287 if (tmp_idata[i]) {
288 retval = free_dind_blocks(handle,
289 inode, tmp_idata[i]);
290 if (retval) {
291 put_bh(bh);
292 return retval;
293 }
294 }
295 }
296 put_bh(bh);
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500297 extend_credit_for_blkdel(handle, inode);
Alex Tomasc9de5602008-01-29 00:19:52 -0500298 ext4_free_blocks(handle, inode, le32_to_cpu(i_data), 1, 1);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500299 return 0;
300}
301
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500302static int free_ind_block(handle_t *handle, struct inode *inode, __le32 *i_data)
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500303{
304 int retval;
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500305
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500306 /* ei->i_data[EXT4_IND_BLOCK] */
307 if (i_data[0]) {
308 extend_credit_for_blkdel(handle, inode);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500309 ext4_free_blocks(handle, inode,
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500310 le32_to_cpu(i_data[0]), 1, 1);
311 }
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500312
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500313 /* ei->i_data[EXT4_DIND_BLOCK] */
314 if (i_data[1]) {
315 retval = free_dind_blocks(handle, inode, i_data[1]);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500316 if (retval)
317 return retval;
318 }
319
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500320 /* ei->i_data[EXT4_TIND_BLOCK] */
321 if (i_data[2]) {
322 retval = free_tind_blocks(handle, inode, i_data[2]);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500323 if (retval)
324 return retval;
325 }
326 return 0;
327}
328
329static int ext4_ext_swap_inode_data(handle_t *handle, struct inode *inode,
Aneesh Kumar K.V267e4db2008-04-29 08:11:12 -0400330 struct inode *tmp_inode)
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500331{
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500332 int retval;
333 __le32 i_data[3];
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500334 struct ext4_inode_info *ei = EXT4_I(inode);
335 struct ext4_inode_info *tmp_ei = EXT4_I(tmp_inode);
336
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500337 /*
338 * One credit accounted for writing the
339 * i_data field of the original inode
340 */
341 retval = ext4_journal_extend(handle, 1);
Aneesh Kumar K.V267e4db2008-04-29 08:11:12 -0400342 if (retval) {
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500343 retval = ext4_journal_restart(handle, 1);
344 if (retval)
345 goto err_out;
346 }
347
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500348 i_data[0] = ei->i_data[EXT4_IND_BLOCK];
349 i_data[1] = ei->i_data[EXT4_DIND_BLOCK];
350 i_data[2] = ei->i_data[EXT4_TIND_BLOCK];
351
352 down_write(&EXT4_I(inode)->i_data_sem);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500353 /*
Aneesh Kumar K.V267e4db2008-04-29 08:11:12 -0400354 * if EXT4_EXT_MIGRATE is cleared a block allocation
355 * happened after we started the migrate. We need to
356 * fail the migrate
357 */
358 if (!(EXT4_I(inode)->i_flags & EXT4_EXT_MIGRATE)) {
359 retval = -EAGAIN;
360 up_write(&EXT4_I(inode)->i_data_sem);
361 goto err_out;
362 } else
363 EXT4_I(inode)->i_flags = EXT4_I(inode)->i_flags &
364 ~EXT4_EXT_MIGRATE;
365 /*
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500366 * We have the extent map build with the tmp inode.
367 * Now copy the i_data across
368 */
369 ei->i_flags |= EXT4_EXTENTS_FL;
370 memcpy(ei->i_data, tmp_ei->i_data, sizeof(ei->i_data));
371
372 /*
373 * Update i_blocks with the new blocks that got
374 * allocated while adding extents for extent index
375 * blocks.
376 *
377 * While converting to extents we need not
378 * update the orignal inode i_blocks for extent blocks
379 * via quota APIs. The quota update happened via tmp_inode already.
380 */
381 spin_lock(&inode->i_lock);
382 inode->i_blocks += tmp_inode->i_blocks;
383 spin_unlock(&inode->i_lock);
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500384 up_write(&EXT4_I(inode)->i_data_sem);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500385
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500386 /*
387 * We mark the inode dirty after, because we decrement the
388 * i_blocks when freeing the indirect meta-data blocks
389 */
390 retval = free_ind_block(handle, inode, i_data);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500391 ext4_mark_inode_dirty(handle, inode);
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500392
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500393err_out:
394 return retval;
395}
396
397static int free_ext_idx(handle_t *handle, struct inode *inode,
398 struct ext4_extent_idx *ix)
399{
400 int i, retval = 0;
401 ext4_fsblk_t block;
402 struct buffer_head *bh;
403 struct ext4_extent_header *eh;
404
405 block = idx_pblock(ix);
406 bh = sb_bread(inode->i_sb, block);
407 if (!bh)
408 return -EIO;
409
410 eh = (struct ext4_extent_header *)bh->b_data;
411 if (eh->eh_depth != 0) {
412 ix = EXT_FIRST_INDEX(eh);
413 for (i = 0; i < le16_to_cpu(eh->eh_entries); i++, ix++) {
414 retval = free_ext_idx(handle, inode, ix);
415 if (retval)
416 break;
417 }
418 }
419 put_bh(bh);
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500420 extend_credit_for_blkdel(handle, inode);
Alex Tomasc9de5602008-01-29 00:19:52 -0500421 ext4_free_blocks(handle, inode, block, 1, 1);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500422 return retval;
423}
424
425/*
426 * Free the extent meta data blocks only
427 */
428static int free_ext_block(handle_t *handle, struct inode *inode)
429{
430 int i, retval = 0;
431 struct ext4_inode_info *ei = EXT4_I(inode);
432 struct ext4_extent_header *eh = (struct ext4_extent_header *)ei->i_data;
433 struct ext4_extent_idx *ix;
434 if (eh->eh_depth == 0)
435 /*
436 * No extra blocks allocated for extent meta data
437 */
438 return 0;
439 ix = EXT_FIRST_INDEX(eh);
440 for (i = 0; i < le16_to_cpu(eh->eh_entries); i++, ix++) {
441 retval = free_ext_idx(handle, inode, ix);
442 if (retval)
443 return retval;
444 }
445 return retval;
446
447}
448
449int ext4_ext_migrate(struct inode *inode, struct file *filp,
450 unsigned int cmd, unsigned long arg)
451{
452 handle_t *handle;
453 int retval = 0, i;
454 __le32 *i_data;
455 ext4_lblk_t blk_count = 0;
456 struct ext4_inode_info *ei;
457 struct inode *tmp_inode = NULL;
458 struct list_blocks_struct lb;
459 unsigned long max_entries;
460
461 if (!test_opt(inode->i_sb, EXTENTS))
462 /*
463 * if mounted with noextents we don't allow the migrate
464 */
465 return -EINVAL;
466
467 if ((EXT4_I(inode)->i_flags & EXT4_EXTENTS_FL))
468 return -EINVAL;
469
Valerie Clementb8356c42008-02-05 10:56:37 -0500470 if (S_ISLNK(inode->i_mode) && inode->i_blocks == 0)
471 /*
472 * don't migrate fast symlink
473 */
474 return retval;
475
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500476 handle = ext4_journal_start(inode,
477 EXT4_DATA_TRANS_BLOCKS(inode->i_sb) +
478 EXT4_INDEX_EXTRA_TRANS_BLOCKS + 3 +
479 2 * EXT4_QUOTA_INIT_BLOCKS(inode->i_sb)
480 + 1);
481 if (IS_ERR(handle)) {
482 retval = PTR_ERR(handle);
483 goto err_out;
484 }
485 tmp_inode = ext4_new_inode(handle,
486 inode->i_sb->s_root->d_inode,
487 S_IFREG);
488 if (IS_ERR(tmp_inode)) {
489 retval = -ENOMEM;
490 ext4_journal_stop(handle);
491 tmp_inode = NULL;
492 goto err_out;
493 }
494 i_size_write(tmp_inode, i_size_read(inode));
495 /*
496 * We don't want the inode to be reclaimed
497 * if we got interrupted in between. We have
498 * this tmp inode carrying reference to the
499 * data blocks of the original file. We set
500 * the i_nlink to zero at the last stage after
501 * switching the original file to extent format
502 */
503 tmp_inode->i_nlink = 1;
504
505 ext4_ext_tree_init(handle, tmp_inode);
506 ext4_orphan_add(handle, tmp_inode);
507 ext4_journal_stop(handle);
508
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500509 /*
510 * start with one credit accounted for
511 * superblock modification.
512 *
513 * For the tmp_inode we already have commited the
514 * trascation that created the inode. Later as and
515 * when we add extents we extent the journal
516 */
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500517 /*
518 * inode_mutex prevent write and truncate on the file. Read still goes
519 * through. We take i_data_sem in ext4_ext_swap_inode_data before we
520 * switch the inode format to prevent read.
521 */
522 mutex_lock(&(inode->i_mutex));
Aneesh Kumar K.V267e4db2008-04-29 08:11:12 -0400523 /*
524 * Even though we take i_mutex we can still cause block allocation
525 * via mmap write to holes. If we have allocated new blocks we fail
526 * migrate. New block allocation will clear EXT4_EXT_MIGRATE flag.
527 * The flag is updated with i_data_sem held to prevent racing with
528 * block allocation.
529 */
530 down_read((&EXT4_I(inode)->i_data_sem));
531 EXT4_I(inode)->i_flags = EXT4_I(inode)->i_flags | EXT4_EXT_MIGRATE;
532 up_read((&EXT4_I(inode)->i_data_sem));
533
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500534 handle = ext4_journal_start(inode, 1);
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500535
536 ei = EXT4_I(inode);
537 i_data = ei->i_data;
538 memset(&lb, 0, sizeof(lb));
539
540 /* 32 bit block address 4 bytes */
541 max_entries = inode->i_sb->s_blocksize >> 2;
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500542 for (i = 0; i < EXT4_NDIR_BLOCKS; i++, blk_count++) {
543 if (i_data[i]) {
544 retval = update_extent_range(handle, tmp_inode,
545 le32_to_cpu(i_data[i]),
546 blk_count, &lb);
547 if (retval)
548 goto err_out;
549 }
550 }
551 if (i_data[EXT4_IND_BLOCK]) {
552 retval = update_ind_extent_range(handle, tmp_inode,
553 le32_to_cpu(i_data[EXT4_IND_BLOCK]),
554 &blk_count, &lb);
555 if (retval)
556 goto err_out;
557 } else
558 blk_count += max_entries;
559 if (i_data[EXT4_DIND_BLOCK]) {
560 retval = update_dind_extent_range(handle, tmp_inode,
561 le32_to_cpu(i_data[EXT4_DIND_BLOCK]),
562 &blk_count, &lb);
563 if (retval)
564 goto err_out;
565 } else
566 blk_count += max_entries * max_entries;
567 if (i_data[EXT4_TIND_BLOCK]) {
568 retval = update_tind_extent_range(handle, tmp_inode,
569 le32_to_cpu(i_data[EXT4_TIND_BLOCK]),
570 &blk_count, &lb);
571 if (retval)
572 goto err_out;
573 }
574 /*
575 * Build the last extent
576 */
577 retval = finish_range(handle, tmp_inode, &lb);
578err_out:
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500579 if (retval)
580 /*
581 * Failure case delete the extent information with the
582 * tmp_inode
583 */
584 free_ext_block(handle, tmp_inode);
Aneesh Kumar K.V267e4db2008-04-29 08:11:12 -0400585 else {
586 retval = ext4_ext_swap_inode_data(handle, inode, tmp_inode);
587 if (retval)
588 /*
589 * if we fail to swap inode data free the extent
590 * details of the tmp inode
591 */
592 free_ext_block(handle, tmp_inode);
593 }
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500594
595 /* We mark the tmp_inode dirty via ext4_ext_tree_init. */
596 if (ext4_journal_extend(handle, 1) != 0)
597 ext4_journal_restart(handle, 1);
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500598
599 /*
600 * Mark the tmp_inode as of size zero
601 */
602 i_size_write(tmp_inode, 0);
603
604 /*
605 * set the i_blocks count to zero
606 * so that the ext4_delete_inode does the
607 * right job
608 *
609 * We don't need to take the i_lock because
610 * the inode is not visible to user space.
611 */
612 tmp_inode->i_blocks = 0;
613
614 /* Reset the extent details */
615 ext4_ext_tree_init(handle, tmp_inode);
616
617 /*
618 * Set the i_nlink to zero so that
619 * generic_drop_inode really deletes the
620 * inode
621 */
622 tmp_inode->i_nlink = 0;
623
624 ext4_journal_stop(handle);
Aneesh Kumar K.V8009f9f2008-02-10 01:20:05 -0500625 mutex_unlock(&(inode->i_mutex));
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -0500626
627 if (tmp_inode)
628 iput(tmp_inode);
629
630 return retval;
631}