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c14c6fd5 AK |
1 | /* |
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> | |
3dcf5451 CH |
16 | #include "ext4_jbd2.h" |
17 | #include "ext4_extents.h" | |
c14c6fd5 AK |
18 | |
19 | /* | |
20 | * The contiguous blocks details which can be | |
21 | * represented by a single extent | |
22 | */ | |
23 | struct list_blocks_struct { | |
24 | ext4_lblk_t first_block, last_block; | |
25 | ext4_fsblk_t first_pblock, last_pblock; | |
26 | }; | |
27 | ||
28 | static 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); | |
b35905c1 | 46 | path = NULL; |
c14c6fd5 AK |
47 | 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 | */ | |
ee12b630 MC |
56 | needed = ext4_ext_calc_credits_for_single_extent(inode, |
57 | lb->last_block - lb->first_block + 1, path); | |
c14c6fd5 AK |
58 | |
59 | /* | |
60 | * Make sure the credit we accumalated is not really high | |
61 | */ | |
62 | if (needed && handle->h_buffer_credits >= EXT4_RESERVE_TRANS_BLOCKS) { | |
63 | retval = ext4_journal_restart(handle, needed); | |
64 | if (retval) | |
65 | goto err_out; | |
8009f9fb | 66 | } else if (needed) { |
c14c6fd5 | 67 | retval = ext4_journal_extend(handle, needed); |
8009f9fb | 68 | if (retval) { |
c14c6fd5 AK |
69 | /* |
70 | * IF not able to extend the journal restart the journal | |
71 | */ | |
72 | retval = ext4_journal_restart(handle, needed); | |
73 | if (retval) | |
74 | goto err_out; | |
75 | } | |
76 | } | |
77 | retval = ext4_ext_insert_extent(handle, inode, path, &newext); | |
78 | err_out: | |
b35905c1 AK |
79 | if (path) { |
80 | ext4_ext_drop_refs(path); | |
81 | kfree(path); | |
82 | } | |
c14c6fd5 AK |
83 | lb->first_pblock = 0; |
84 | return retval; | |
85 | } | |
86 | ||
87 | static int update_extent_range(handle_t *handle, struct inode *inode, | |
88 | ext4_fsblk_t pblock, ext4_lblk_t blk_num, | |
89 | struct list_blocks_struct *lb) | |
90 | { | |
91 | int retval; | |
92 | /* | |
93 | * See if we can add on to the existing range (if it exists) | |
94 | */ | |
95 | if (lb->first_pblock && | |
96 | (lb->last_pblock+1 == pblock) && | |
97 | (lb->last_block+1 == blk_num)) { | |
98 | lb->last_pblock = pblock; | |
99 | lb->last_block = blk_num; | |
100 | return 0; | |
101 | } | |
102 | /* | |
103 | * Start a new range. | |
104 | */ | |
105 | retval = finish_range(handle, inode, lb); | |
106 | lb->first_pblock = lb->last_pblock = pblock; | |
107 | lb->first_block = lb->last_block = blk_num; | |
108 | ||
109 | return retval; | |
110 | } | |
111 | ||
112 | static int update_ind_extent_range(handle_t *handle, struct inode *inode, | |
113 | ext4_fsblk_t pblock, ext4_lblk_t *blk_nump, | |
114 | struct list_blocks_struct *lb) | |
115 | { | |
116 | struct buffer_head *bh; | |
117 | __le32 *i_data; | |
118 | int i, retval = 0; | |
119 | ext4_lblk_t blk_count = *blk_nump; | |
120 | unsigned long max_entries = inode->i_sb->s_blocksize >> 2; | |
121 | ||
122 | if (!pblock) { | |
123 | /* Only update the file block number */ | |
124 | *blk_nump += max_entries; | |
125 | return 0; | |
126 | } | |
127 | ||
128 | bh = sb_bread(inode->i_sb, pblock); | |
129 | if (!bh) | |
130 | return -EIO; | |
131 | ||
132 | i_data = (__le32 *)bh->b_data; | |
133 | for (i = 0; i < max_entries; i++, blk_count++) { | |
134 | if (i_data[i]) { | |
135 | retval = update_extent_range(handle, inode, | |
136 | le32_to_cpu(i_data[i]), | |
137 | blk_count, lb); | |
138 | if (retval) | |
139 | break; | |
140 | } | |
141 | } | |
142 | ||
143 | /* Update the file block number */ | |
144 | *blk_nump = blk_count; | |
145 | put_bh(bh); | |
146 | return retval; | |
147 | ||
148 | } | |
149 | ||
150 | static int update_dind_extent_range(handle_t *handle, struct inode *inode, | |
151 | ext4_fsblk_t pblock, ext4_lblk_t *blk_nump, | |
152 | struct list_blocks_struct *lb) | |
153 | { | |
154 | struct buffer_head *bh; | |
155 | __le32 *i_data; | |
156 | int i, retval = 0; | |
157 | ext4_lblk_t blk_count = *blk_nump; | |
158 | unsigned long max_entries = inode->i_sb->s_blocksize >> 2; | |
159 | ||
160 | if (!pblock) { | |
161 | /* Only update the file block number */ | |
162 | *blk_nump += max_entries * max_entries; | |
163 | return 0; | |
164 | } | |
165 | bh = sb_bread(inode->i_sb, pblock); | |
166 | if (!bh) | |
167 | return -EIO; | |
168 | ||
169 | i_data = (__le32 *)bh->b_data; | |
170 | for (i = 0; i < max_entries; i++) { | |
171 | if (i_data[i]) { | |
172 | retval = update_ind_extent_range(handle, inode, | |
173 | le32_to_cpu(i_data[i]), | |
174 | &blk_count, lb); | |
175 | if (retval) | |
176 | break; | |
177 | } else { | |
178 | /* Only update the file block number */ | |
179 | blk_count += max_entries; | |
180 | } | |
181 | } | |
182 | ||
183 | /* Update the file block number */ | |
184 | *blk_nump = blk_count; | |
185 | put_bh(bh); | |
186 | return retval; | |
187 | ||
188 | } | |
189 | ||
190 | static int update_tind_extent_range(handle_t *handle, struct inode *inode, | |
191 | ext4_fsblk_t pblock, ext4_lblk_t *blk_nump, | |
192 | struct list_blocks_struct *lb) | |
193 | { | |
194 | struct buffer_head *bh; | |
195 | __le32 *i_data; | |
196 | int i, retval = 0; | |
197 | ext4_lblk_t blk_count = *blk_nump; | |
198 | unsigned long max_entries = inode->i_sb->s_blocksize >> 2; | |
199 | ||
200 | if (!pblock) { | |
201 | /* Only update the file block number */ | |
202 | *blk_nump += max_entries * max_entries * max_entries; | |
203 | return 0; | |
204 | } | |
205 | bh = sb_bread(inode->i_sb, pblock); | |
206 | if (!bh) | |
207 | return -EIO; | |
208 | ||
209 | i_data = (__le32 *)bh->b_data; | |
210 | for (i = 0; i < max_entries; i++) { | |
211 | if (i_data[i]) { | |
212 | retval = update_dind_extent_range(handle, inode, | |
213 | le32_to_cpu(i_data[i]), | |
214 | &blk_count, lb); | |
215 | if (retval) | |
216 | break; | |
217 | } else | |
218 | /* Only update the file block number */ | |
219 | blk_count += max_entries * max_entries; | |
220 | } | |
221 | /* Update the file block number */ | |
222 | *blk_nump = blk_count; | |
223 | put_bh(bh); | |
224 | return retval; | |
225 | ||
226 | } | |
227 | ||
8009f9fb AK |
228 | static int extend_credit_for_blkdel(handle_t *handle, struct inode *inode) |
229 | { | |
230 | int retval = 0, needed; | |
231 | ||
232 | if (handle->h_buffer_credits > EXT4_RESERVE_TRANS_BLOCKS) | |
233 | return 0; | |
234 | /* | |
235 | * We are freeing a blocks. During this we touch | |
236 | * superblock, group descriptor and block bitmap. | |
237 | * So allocate a credit of 3. We may update | |
238 | * quota (user and group). | |
239 | */ | |
240 | needed = 3 + 2*EXT4_QUOTA_TRANS_BLOCKS(inode->i_sb); | |
241 | ||
242 | if (ext4_journal_extend(handle, needed) != 0) | |
243 | retval = ext4_journal_restart(handle, needed); | |
244 | ||
245 | return retval; | |
246 | } | |
247 | ||
c14c6fd5 AK |
248 | static int free_dind_blocks(handle_t *handle, |
249 | struct inode *inode, __le32 i_data) | |
250 | { | |
251 | int i; | |
252 | __le32 *tmp_idata; | |
253 | struct buffer_head *bh; | |
254 | unsigned long max_entries = inode->i_sb->s_blocksize >> 2; | |
255 | ||
256 | bh = sb_bread(inode->i_sb, le32_to_cpu(i_data)); | |
257 | if (!bh) | |
258 | return -EIO; | |
259 | ||
260 | tmp_idata = (__le32 *)bh->b_data; | |
261 | for (i = 0; i < max_entries; i++) { | |
8009f9fb AK |
262 | if (tmp_idata[i]) { |
263 | extend_credit_for_blkdel(handle, inode); | |
c14c6fd5 | 264 | ext4_free_blocks(handle, inode, |
c9de560d | 265 | le32_to_cpu(tmp_idata[i]), 1, 1); |
8009f9fb | 266 | } |
c14c6fd5 AK |
267 | } |
268 | put_bh(bh); | |
8009f9fb | 269 | extend_credit_for_blkdel(handle, inode); |
c9de560d | 270 | ext4_free_blocks(handle, inode, le32_to_cpu(i_data), 1, 1); |
c14c6fd5 AK |
271 | return 0; |
272 | } | |
273 | ||
274 | static int free_tind_blocks(handle_t *handle, | |
275 | struct inode *inode, __le32 i_data) | |
276 | { | |
277 | int i, retval = 0; | |
278 | __le32 *tmp_idata; | |
279 | struct buffer_head *bh; | |
280 | unsigned long max_entries = inode->i_sb->s_blocksize >> 2; | |
281 | ||
282 | bh = sb_bread(inode->i_sb, le32_to_cpu(i_data)); | |
283 | if (!bh) | |
284 | return -EIO; | |
285 | ||
286 | tmp_idata = (__le32 *)bh->b_data; | |
287 | for (i = 0; i < max_entries; i++) { | |
288 | if (tmp_idata[i]) { | |
289 | retval = free_dind_blocks(handle, | |
290 | inode, tmp_idata[i]); | |
291 | if (retval) { | |
292 | put_bh(bh); | |
293 | return retval; | |
294 | } | |
295 | } | |
296 | } | |
297 | put_bh(bh); | |
8009f9fb | 298 | extend_credit_for_blkdel(handle, inode); |
c9de560d | 299 | ext4_free_blocks(handle, inode, le32_to_cpu(i_data), 1, 1); |
c14c6fd5 AK |
300 | return 0; |
301 | } | |
302 | ||
8009f9fb | 303 | static int free_ind_block(handle_t *handle, struct inode *inode, __le32 *i_data) |
c14c6fd5 AK |
304 | { |
305 | int retval; | |
c14c6fd5 | 306 | |
8009f9fb AK |
307 | /* ei->i_data[EXT4_IND_BLOCK] */ |
308 | if (i_data[0]) { | |
309 | extend_credit_for_blkdel(handle, inode); | |
c14c6fd5 | 310 | ext4_free_blocks(handle, inode, |
8009f9fb AK |
311 | le32_to_cpu(i_data[0]), 1, 1); |
312 | } | |
c14c6fd5 | 313 | |
8009f9fb AK |
314 | /* ei->i_data[EXT4_DIND_BLOCK] */ |
315 | if (i_data[1]) { | |
316 | retval = free_dind_blocks(handle, inode, i_data[1]); | |
c14c6fd5 AK |
317 | if (retval) |
318 | return retval; | |
319 | } | |
320 | ||
8009f9fb AK |
321 | /* ei->i_data[EXT4_TIND_BLOCK] */ |
322 | if (i_data[2]) { | |
323 | retval = free_tind_blocks(handle, inode, i_data[2]); | |
c14c6fd5 AK |
324 | if (retval) |
325 | return retval; | |
326 | } | |
327 | return 0; | |
328 | } | |
329 | ||
330 | static int ext4_ext_swap_inode_data(handle_t *handle, struct inode *inode, | |
267e4db9 | 331 | struct inode *tmp_inode) |
c14c6fd5 | 332 | { |
8009f9fb AK |
333 | int retval; |
334 | __le32 i_data[3]; | |
c14c6fd5 AK |
335 | struct ext4_inode_info *ei = EXT4_I(inode); |
336 | struct ext4_inode_info *tmp_ei = EXT4_I(tmp_inode); | |
337 | ||
c14c6fd5 AK |
338 | /* |
339 | * One credit accounted for writing the | |
340 | * i_data field of the original inode | |
341 | */ | |
342 | retval = ext4_journal_extend(handle, 1); | |
267e4db9 | 343 | if (retval) { |
c14c6fd5 AK |
344 | retval = ext4_journal_restart(handle, 1); |
345 | if (retval) | |
346 | goto err_out; | |
347 | } | |
348 | ||
8009f9fb AK |
349 | i_data[0] = ei->i_data[EXT4_IND_BLOCK]; |
350 | i_data[1] = ei->i_data[EXT4_DIND_BLOCK]; | |
351 | i_data[2] = ei->i_data[EXT4_TIND_BLOCK]; | |
352 | ||
353 | down_write(&EXT4_I(inode)->i_data_sem); | |
267e4db9 AK |
354 | /* |
355 | * if EXT4_EXT_MIGRATE is cleared a block allocation | |
356 | * happened after we started the migrate. We need to | |
357 | * fail the migrate | |
358 | */ | |
359 | if (!(EXT4_I(inode)->i_flags & EXT4_EXT_MIGRATE)) { | |
360 | retval = -EAGAIN; | |
361 | up_write(&EXT4_I(inode)->i_data_sem); | |
362 | goto err_out; | |
363 | } else | |
364 | EXT4_I(inode)->i_flags = EXT4_I(inode)->i_flags & | |
365 | ~EXT4_EXT_MIGRATE; | |
c14c6fd5 AK |
366 | /* |
367 | * We have the extent map build with the tmp inode. | |
368 | * Now copy the i_data across | |
369 | */ | |
370 | ei->i_flags |= EXT4_EXTENTS_FL; | |
371 | memcpy(ei->i_data, tmp_ei->i_data, sizeof(ei->i_data)); | |
372 | ||
373 | /* | |
374 | * Update i_blocks with the new blocks that got | |
375 | * allocated while adding extents for extent index | |
376 | * blocks. | |
377 | * | |
378 | * While converting to extents we need not | |
379 | * update the orignal inode i_blocks for extent blocks | |
380 | * via quota APIs. The quota update happened via tmp_inode already. | |
381 | */ | |
382 | spin_lock(&inode->i_lock); | |
383 | inode->i_blocks += tmp_inode->i_blocks; | |
384 | spin_unlock(&inode->i_lock); | |
8009f9fb | 385 | up_write(&EXT4_I(inode)->i_data_sem); |
c14c6fd5 | 386 | |
8009f9fb AK |
387 | /* |
388 | * We mark the inode dirty after, because we decrement the | |
389 | * i_blocks when freeing the indirect meta-data blocks | |
390 | */ | |
391 | retval = free_ind_block(handle, inode, i_data); | |
c14c6fd5 | 392 | ext4_mark_inode_dirty(handle, inode); |
8009f9fb | 393 | |
c14c6fd5 AK |
394 | err_out: |
395 | return retval; | |
396 | } | |
397 | ||
398 | static int free_ext_idx(handle_t *handle, struct inode *inode, | |
399 | struct ext4_extent_idx *ix) | |
400 | { | |
401 | int i, retval = 0; | |
402 | ext4_fsblk_t block; | |
403 | struct buffer_head *bh; | |
404 | struct ext4_extent_header *eh; | |
405 | ||
406 | block = idx_pblock(ix); | |
407 | bh = sb_bread(inode->i_sb, block); | |
408 | if (!bh) | |
409 | return -EIO; | |
410 | ||
411 | eh = (struct ext4_extent_header *)bh->b_data; | |
412 | if (eh->eh_depth != 0) { | |
413 | ix = EXT_FIRST_INDEX(eh); | |
414 | for (i = 0; i < le16_to_cpu(eh->eh_entries); i++, ix++) { | |
415 | retval = free_ext_idx(handle, inode, ix); | |
416 | if (retval) | |
417 | break; | |
418 | } | |
419 | } | |
420 | put_bh(bh); | |
8009f9fb | 421 | extend_credit_for_blkdel(handle, inode); |
c9de560d | 422 | ext4_free_blocks(handle, inode, block, 1, 1); |
c14c6fd5 AK |
423 | return retval; |
424 | } | |
425 | ||
426 | /* | |
427 | * Free the extent meta data blocks only | |
428 | */ | |
429 | static int free_ext_block(handle_t *handle, struct inode *inode) | |
430 | { | |
431 | int i, retval = 0; | |
432 | struct ext4_inode_info *ei = EXT4_I(inode); | |
433 | struct ext4_extent_header *eh = (struct ext4_extent_header *)ei->i_data; | |
434 | struct ext4_extent_idx *ix; | |
435 | if (eh->eh_depth == 0) | |
436 | /* | |
437 | * No extra blocks allocated for extent meta data | |
438 | */ | |
439 | return 0; | |
440 | ix = EXT_FIRST_INDEX(eh); | |
441 | for (i = 0; i < le16_to_cpu(eh->eh_entries); i++, ix++) { | |
442 | retval = free_ext_idx(handle, inode, ix); | |
443 | if (retval) | |
444 | return retval; | |
445 | } | |
446 | return retval; | |
447 | ||
448 | } | |
449 | ||
2a43a878 | 450 | int ext4_ext_migrate(struct inode *inode) |
c14c6fd5 AK |
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 | ||
b8356c46 VC |
470 | if (S_ISLNK(inode->i_mode) && inode->i_blocks == 0) |
471 | /* | |
472 | * don't migrate fast symlink | |
473 | */ | |
474 | return retval; | |
475 | ||
c14c6fd5 AK |
476 | 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 | ||
c14c6fd5 AK |
509 | /* |
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 | */ | |
267e4db9 AK |
517 | /* |
518 | * Even though we take i_mutex we can still cause block allocation | |
519 | * via mmap write to holes. If we have allocated new blocks we fail | |
520 | * migrate. New block allocation will clear EXT4_EXT_MIGRATE flag. | |
521 | * The flag is updated with i_data_sem held to prevent racing with | |
522 | * block allocation. | |
523 | */ | |
524 | down_read((&EXT4_I(inode)->i_data_sem)); | |
525 | EXT4_I(inode)->i_flags = EXT4_I(inode)->i_flags | EXT4_EXT_MIGRATE; | |
526 | up_read((&EXT4_I(inode)->i_data_sem)); | |
527 | ||
c14c6fd5 | 528 | handle = ext4_journal_start(inode, 1); |
8009f9fb AK |
529 | |
530 | ei = EXT4_I(inode); | |
531 | i_data = ei->i_data; | |
532 | memset(&lb, 0, sizeof(lb)); | |
533 | ||
534 | /* 32 bit block address 4 bytes */ | |
535 | max_entries = inode->i_sb->s_blocksize >> 2; | |
c14c6fd5 AK |
536 | for (i = 0; i < EXT4_NDIR_BLOCKS; i++, blk_count++) { |
537 | if (i_data[i]) { | |
538 | retval = update_extent_range(handle, tmp_inode, | |
539 | le32_to_cpu(i_data[i]), | |
540 | blk_count, &lb); | |
541 | if (retval) | |
542 | goto err_out; | |
543 | } | |
544 | } | |
545 | if (i_data[EXT4_IND_BLOCK]) { | |
546 | retval = update_ind_extent_range(handle, tmp_inode, | |
547 | le32_to_cpu(i_data[EXT4_IND_BLOCK]), | |
548 | &blk_count, &lb); | |
549 | if (retval) | |
550 | goto err_out; | |
551 | } else | |
552 | blk_count += max_entries; | |
553 | if (i_data[EXT4_DIND_BLOCK]) { | |
554 | retval = update_dind_extent_range(handle, tmp_inode, | |
555 | le32_to_cpu(i_data[EXT4_DIND_BLOCK]), | |
556 | &blk_count, &lb); | |
557 | if (retval) | |
558 | goto err_out; | |
559 | } else | |
560 | blk_count += max_entries * max_entries; | |
561 | if (i_data[EXT4_TIND_BLOCK]) { | |
562 | retval = update_tind_extent_range(handle, tmp_inode, | |
563 | le32_to_cpu(i_data[EXT4_TIND_BLOCK]), | |
564 | &blk_count, &lb); | |
565 | if (retval) | |
566 | goto err_out; | |
567 | } | |
568 | /* | |
569 | * Build the last extent | |
570 | */ | |
571 | retval = finish_range(handle, tmp_inode, &lb); | |
572 | err_out: | |
c14c6fd5 AK |
573 | if (retval) |
574 | /* | |
575 | * Failure case delete the extent information with the | |
576 | * tmp_inode | |
577 | */ | |
578 | free_ext_block(handle, tmp_inode); | |
267e4db9 AK |
579 | else { |
580 | retval = ext4_ext_swap_inode_data(handle, inode, tmp_inode); | |
581 | if (retval) | |
582 | /* | |
583 | * if we fail to swap inode data free the extent | |
584 | * details of the tmp inode | |
585 | */ | |
586 | free_ext_block(handle, tmp_inode); | |
587 | } | |
8009f9fb AK |
588 | |
589 | /* We mark the tmp_inode dirty via ext4_ext_tree_init. */ | |
590 | if (ext4_journal_extend(handle, 1) != 0) | |
591 | ext4_journal_restart(handle, 1); | |
c14c6fd5 AK |
592 | |
593 | /* | |
594 | * Mark the tmp_inode as of size zero | |
595 | */ | |
596 | i_size_write(tmp_inode, 0); | |
597 | ||
598 | /* | |
599 | * set the i_blocks count to zero | |
600 | * so that the ext4_delete_inode does the | |
601 | * right job | |
602 | * | |
603 | * We don't need to take the i_lock because | |
604 | * the inode is not visible to user space. | |
605 | */ | |
606 | tmp_inode->i_blocks = 0; | |
607 | ||
608 | /* Reset the extent details */ | |
609 | ext4_ext_tree_init(handle, tmp_inode); | |
610 | ||
611 | /* | |
612 | * Set the i_nlink to zero so that | |
613 | * generic_drop_inode really deletes the | |
614 | * inode | |
615 | */ | |
616 | tmp_inode->i_nlink = 0; | |
617 | ||
618 | ext4_journal_stop(handle); | |
c14c6fd5 AK |
619 | |
620 | if (tmp_inode) | |
621 | iput(tmp_inode); | |
622 | ||
623 | return retval; | |
624 | } |