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Commit | Line | Data |
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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> | |
5a0e3ad6 | 16 | #include <linux/slab.h> |
3dcf5451 CH |
17 | #include "ext4_jbd2.h" |
18 | #include "ext4_extents.h" | |
c14c6fd5 AK |
19 | |
20 | /* | |
21 | * The contiguous blocks details which can be | |
22 | * represented by a single extent | |
23 | */ | |
24 | struct list_blocks_struct { | |
25 | ext4_lblk_t first_block, last_block; | |
26 | ext4_fsblk_t first_pblock, last_pblock; | |
27 | }; | |
28 | ||
29 | static int finish_range(handle_t *handle, struct inode *inode, | |
30 | struct list_blocks_struct *lb) | |
31 | ||
32 | { | |
33 | int retval = 0, needed; | |
34 | struct ext4_extent newext; | |
35 | struct ext4_ext_path *path; | |
36 | if (lb->first_pblock == 0) | |
37 | return 0; | |
38 | ||
39 | /* Add the extent to temp inode*/ | |
40 | newext.ee_block = cpu_to_le32(lb->first_block); | |
41 | newext.ee_len = cpu_to_le16(lb->last_block - lb->first_block + 1); | |
42 | ext4_ext_store_pblock(&newext, lb->first_pblock); | |
43 | path = ext4_ext_find_extent(inode, lb->first_block, NULL); | |
44 | ||
45 | if (IS_ERR(path)) { | |
46 | retval = PTR_ERR(path); | |
b35905c1 | 47 | path = NULL; |
c14c6fd5 AK |
48 | goto err_out; |
49 | } | |
50 | ||
51 | /* | |
52 | * Calculate the credit needed to inserting this extent | |
53 | * Since we are doing this in loop we may accumalate extra | |
54 | * credit. But below we try to not accumalate too much | |
55 | * of them by restarting the journal. | |
56 | */ | |
ee12b630 MC |
57 | needed = ext4_ext_calc_credits_for_single_extent(inode, |
58 | lb->last_block - lb->first_block + 1, path); | |
c14c6fd5 AK |
59 | |
60 | /* | |
61 | * Make sure the credit we accumalated is not really high | |
62 | */ | |
0390131b FM |
63 | if (needed && ext4_handle_has_enough_credits(handle, |
64 | EXT4_RESERVE_TRANS_BLOCKS)) { | |
c14c6fd5 AK |
65 | retval = ext4_journal_restart(handle, needed); |
66 | if (retval) | |
67 | goto err_out; | |
8009f9fb | 68 | } else if (needed) { |
c14c6fd5 | 69 | retval = ext4_journal_extend(handle, needed); |
8009f9fb | 70 | if (retval) { |
c14c6fd5 AK |
71 | /* |
72 | * IF not able to extend the journal restart the journal | |
73 | */ | |
74 | retval = ext4_journal_restart(handle, needed); | |
75 | if (retval) | |
76 | goto err_out; | |
77 | } | |
78 | } | |
0031462b | 79 | retval = ext4_ext_insert_extent(handle, inode, path, &newext, 0); |
c14c6fd5 | 80 | err_out: |
b35905c1 AK |
81 | if (path) { |
82 | ext4_ext_drop_refs(path); | |
83 | kfree(path); | |
84 | } | |
c14c6fd5 AK |
85 | lb->first_pblock = 0; |
86 | return retval; | |
87 | } | |
88 | ||
89 | static int update_extent_range(handle_t *handle, struct inode *inode, | |
90 | ext4_fsblk_t pblock, ext4_lblk_t blk_num, | |
91 | struct list_blocks_struct *lb) | |
92 | { | |
93 | int retval; | |
94 | /* | |
95 | * See if we can add on to the existing range (if it exists) | |
96 | */ | |
97 | if (lb->first_pblock && | |
98 | (lb->last_pblock+1 == pblock) && | |
99 | (lb->last_block+1 == blk_num)) { | |
100 | lb->last_pblock = pblock; | |
101 | lb->last_block = blk_num; | |
102 | return 0; | |
103 | } | |
104 | /* | |
105 | * Start a new range. | |
106 | */ | |
107 | retval = finish_range(handle, inode, lb); | |
108 | lb->first_pblock = lb->last_pblock = pblock; | |
109 | lb->first_block = lb->last_block = blk_num; | |
110 | ||
111 | return retval; | |
112 | } | |
113 | ||
114 | static int update_ind_extent_range(handle_t *handle, struct inode *inode, | |
115 | ext4_fsblk_t pblock, ext4_lblk_t *blk_nump, | |
116 | struct list_blocks_struct *lb) | |
117 | { | |
118 | struct buffer_head *bh; | |
119 | __le32 *i_data; | |
120 | int i, retval = 0; | |
121 | ext4_lblk_t blk_count = *blk_nump; | |
122 | unsigned long max_entries = inode->i_sb->s_blocksize >> 2; | |
123 | ||
124 | if (!pblock) { | |
125 | /* Only update the file block number */ | |
126 | *blk_nump += max_entries; | |
127 | return 0; | |
128 | } | |
129 | ||
130 | bh = sb_bread(inode->i_sb, pblock); | |
131 | if (!bh) | |
132 | return -EIO; | |
133 | ||
134 | i_data = (__le32 *)bh->b_data; | |
135 | for (i = 0; i < max_entries; i++, blk_count++) { | |
136 | if (i_data[i]) { | |
137 | retval = update_extent_range(handle, inode, | |
138 | le32_to_cpu(i_data[i]), | |
139 | blk_count, lb); | |
140 | if (retval) | |
141 | break; | |
142 | } | |
143 | } | |
144 | ||
145 | /* Update the file block number */ | |
146 | *blk_nump = blk_count; | |
147 | put_bh(bh); | |
148 | return retval; | |
149 | ||
150 | } | |
151 | ||
152 | static int update_dind_extent_range(handle_t *handle, struct inode *inode, | |
153 | ext4_fsblk_t pblock, ext4_lblk_t *blk_nump, | |
154 | struct list_blocks_struct *lb) | |
155 | { | |
156 | struct buffer_head *bh; | |
157 | __le32 *i_data; | |
158 | int i, retval = 0; | |
159 | ext4_lblk_t blk_count = *blk_nump; | |
160 | unsigned long max_entries = inode->i_sb->s_blocksize >> 2; | |
161 | ||
162 | if (!pblock) { | |
163 | /* Only update the file block number */ | |
164 | *blk_nump += max_entries * max_entries; | |
165 | return 0; | |
166 | } | |
167 | bh = sb_bread(inode->i_sb, pblock); | |
168 | if (!bh) | |
169 | return -EIO; | |
170 | ||
171 | i_data = (__le32 *)bh->b_data; | |
172 | for (i = 0; i < max_entries; i++) { | |
173 | if (i_data[i]) { | |
174 | retval = update_ind_extent_range(handle, inode, | |
175 | le32_to_cpu(i_data[i]), | |
176 | &blk_count, lb); | |
177 | if (retval) | |
178 | break; | |
179 | } else { | |
180 | /* Only update the file block number */ | |
181 | blk_count += max_entries; | |
182 | } | |
183 | } | |
184 | ||
185 | /* Update the file block number */ | |
186 | *blk_nump = blk_count; | |
187 | put_bh(bh); | |
188 | return retval; | |
189 | ||
190 | } | |
191 | ||
192 | static int update_tind_extent_range(handle_t *handle, struct inode *inode, | |
193 | ext4_fsblk_t pblock, ext4_lblk_t *blk_nump, | |
194 | struct list_blocks_struct *lb) | |
195 | { | |
196 | struct buffer_head *bh; | |
197 | __le32 *i_data; | |
198 | int i, retval = 0; | |
199 | ext4_lblk_t blk_count = *blk_nump; | |
200 | unsigned long max_entries = inode->i_sb->s_blocksize >> 2; | |
201 | ||
202 | if (!pblock) { | |
203 | /* Only update the file block number */ | |
204 | *blk_nump += max_entries * max_entries * max_entries; | |
205 | return 0; | |
206 | } | |
207 | bh = sb_bread(inode->i_sb, pblock); | |
208 | if (!bh) | |
209 | return -EIO; | |
210 | ||
211 | i_data = (__le32 *)bh->b_data; | |
212 | for (i = 0; i < max_entries; i++) { | |
213 | if (i_data[i]) { | |
214 | retval = update_dind_extent_range(handle, inode, | |
215 | le32_to_cpu(i_data[i]), | |
216 | &blk_count, lb); | |
217 | if (retval) | |
218 | break; | |
219 | } else | |
220 | /* Only update the file block number */ | |
221 | blk_count += max_entries * max_entries; | |
222 | } | |
223 | /* Update the file block number */ | |
224 | *blk_nump = blk_count; | |
225 | put_bh(bh); | |
226 | return retval; | |
227 | ||
228 | } | |
229 | ||
8009f9fb AK |
230 | static int extend_credit_for_blkdel(handle_t *handle, struct inode *inode) |
231 | { | |
232 | int retval = 0, needed; | |
233 | ||
0390131b | 234 | if (ext4_handle_has_enough_credits(handle, EXT4_RESERVE_TRANS_BLOCKS+1)) |
8009f9fb AK |
235 | return 0; |
236 | /* | |
237 | * We are freeing a blocks. During this we touch | |
238 | * superblock, group descriptor and block bitmap. | |
239 | * So allocate a credit of 3. We may update | |
240 | * quota (user and group). | |
241 | */ | |
5aca07eb | 242 | needed = 3 + EXT4_MAXQUOTAS_TRANS_BLOCKS(inode->i_sb); |
8009f9fb AK |
243 | |
244 | if (ext4_journal_extend(handle, needed) != 0) | |
245 | retval = ext4_journal_restart(handle, needed); | |
246 | ||
247 | return retval; | |
248 | } | |
249 | ||
c14c6fd5 AK |
250 | static int free_dind_blocks(handle_t *handle, |
251 | struct inode *inode, __le32 i_data) | |
252 | { | |
253 | int i; | |
254 | __le32 *tmp_idata; | |
255 | struct buffer_head *bh; | |
256 | unsigned long max_entries = inode->i_sb->s_blocksize >> 2; | |
257 | ||
258 | bh = sb_bread(inode->i_sb, le32_to_cpu(i_data)); | |
259 | if (!bh) | |
260 | return -EIO; | |
261 | ||
262 | tmp_idata = (__le32 *)bh->b_data; | |
263 | for (i = 0; i < max_entries; i++) { | |
8009f9fb AK |
264 | if (tmp_idata[i]) { |
265 | extend_credit_for_blkdel(handle, inode); | |
7dc57615 | 266 | ext4_free_blocks(handle, inode, NULL, |
e6362609 TT |
267 | le32_to_cpu(tmp_idata[i]), 1, |
268 | EXT4_FREE_BLOCKS_METADATA | | |
269 | EXT4_FREE_BLOCKS_FORGET); | |
8009f9fb | 270 | } |
c14c6fd5 AK |
271 | } |
272 | put_bh(bh); | |
8009f9fb | 273 | extend_credit_for_blkdel(handle, inode); |
7dc57615 | 274 | ext4_free_blocks(handle, inode, NULL, le32_to_cpu(i_data), 1, |
e6362609 TT |
275 | EXT4_FREE_BLOCKS_METADATA | |
276 | EXT4_FREE_BLOCKS_FORGET); | |
c14c6fd5 AK |
277 | return 0; |
278 | } | |
279 | ||
280 | static int free_tind_blocks(handle_t *handle, | |
281 | struct inode *inode, __le32 i_data) | |
282 | { | |
283 | int i, retval = 0; | |
284 | __le32 *tmp_idata; | |
285 | struct buffer_head *bh; | |
286 | unsigned long max_entries = inode->i_sb->s_blocksize >> 2; | |
287 | ||
288 | bh = sb_bread(inode->i_sb, le32_to_cpu(i_data)); | |
289 | if (!bh) | |
290 | return -EIO; | |
291 | ||
292 | tmp_idata = (__le32 *)bh->b_data; | |
293 | for (i = 0; i < max_entries; i++) { | |
294 | if (tmp_idata[i]) { | |
295 | retval = free_dind_blocks(handle, | |
296 | inode, tmp_idata[i]); | |
297 | if (retval) { | |
298 | put_bh(bh); | |
299 | return retval; | |
300 | } | |
301 | } | |
302 | } | |
303 | put_bh(bh); | |
8009f9fb | 304 | extend_credit_for_blkdel(handle, inode); |
7dc57615 | 305 | ext4_free_blocks(handle, inode, NULL, le32_to_cpu(i_data), 1, |
e6362609 TT |
306 | EXT4_FREE_BLOCKS_METADATA | |
307 | EXT4_FREE_BLOCKS_FORGET); | |
c14c6fd5 AK |
308 | return 0; |
309 | } | |
310 | ||
8009f9fb | 311 | static int free_ind_block(handle_t *handle, struct inode *inode, __le32 *i_data) |
c14c6fd5 AK |
312 | { |
313 | int retval; | |
c14c6fd5 | 314 | |
8009f9fb AK |
315 | /* ei->i_data[EXT4_IND_BLOCK] */ |
316 | if (i_data[0]) { | |
317 | extend_credit_for_blkdel(handle, inode); | |
7dc57615 | 318 | ext4_free_blocks(handle, inode, NULL, |
e6362609 TT |
319 | le32_to_cpu(i_data[0]), 1, |
320 | EXT4_FREE_BLOCKS_METADATA | | |
321 | EXT4_FREE_BLOCKS_FORGET); | |
8009f9fb | 322 | } |
c14c6fd5 | 323 | |
8009f9fb AK |
324 | /* ei->i_data[EXT4_DIND_BLOCK] */ |
325 | if (i_data[1]) { | |
326 | retval = free_dind_blocks(handle, inode, i_data[1]); | |
c14c6fd5 AK |
327 | if (retval) |
328 | return retval; | |
329 | } | |
330 | ||
8009f9fb AK |
331 | /* ei->i_data[EXT4_TIND_BLOCK] */ |
332 | if (i_data[2]) { | |
333 | retval = free_tind_blocks(handle, inode, i_data[2]); | |
c14c6fd5 AK |
334 | if (retval) |
335 | return retval; | |
336 | } | |
337 | return 0; | |
338 | } | |
339 | ||
340 | static int ext4_ext_swap_inode_data(handle_t *handle, struct inode *inode, | |
267e4db9 | 341 | struct inode *tmp_inode) |
c14c6fd5 | 342 | { |
8009f9fb AK |
343 | int retval; |
344 | __le32 i_data[3]; | |
c14c6fd5 AK |
345 | struct ext4_inode_info *ei = EXT4_I(inode); |
346 | struct ext4_inode_info *tmp_ei = EXT4_I(tmp_inode); | |
347 | ||
c14c6fd5 AK |
348 | /* |
349 | * One credit accounted for writing the | |
350 | * i_data field of the original inode | |
351 | */ | |
352 | retval = ext4_journal_extend(handle, 1); | |
267e4db9 | 353 | if (retval) { |
c14c6fd5 AK |
354 | retval = ext4_journal_restart(handle, 1); |
355 | if (retval) | |
356 | goto err_out; | |
357 | } | |
358 | ||
8009f9fb AK |
359 | i_data[0] = ei->i_data[EXT4_IND_BLOCK]; |
360 | i_data[1] = ei->i_data[EXT4_DIND_BLOCK]; | |
361 | i_data[2] = ei->i_data[EXT4_TIND_BLOCK]; | |
362 | ||
363 | down_write(&EXT4_I(inode)->i_data_sem); | |
267e4db9 | 364 | /* |
1b9c12f4 | 365 | * if EXT4_STATE_EXT_MIGRATE is cleared a block allocation |
267e4db9 AK |
366 | * happened after we started the migrate. We need to |
367 | * fail the migrate | |
368 | */ | |
19f5fb7a | 369 | if (!ext4_test_inode_state(inode, EXT4_STATE_EXT_MIGRATE)) { |
267e4db9 AK |
370 | retval = -EAGAIN; |
371 | up_write(&EXT4_I(inode)->i_data_sem); | |
372 | goto err_out; | |
373 | } else | |
19f5fb7a | 374 | ext4_clear_inode_state(inode, EXT4_STATE_EXT_MIGRATE); |
c14c6fd5 AK |
375 | /* |
376 | * We have the extent map build with the tmp inode. | |
377 | * Now copy the i_data across | |
378 | */ | |
07a03824 | 379 | ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS); |
c14c6fd5 AK |
380 | memcpy(ei->i_data, tmp_ei->i_data, sizeof(ei->i_data)); |
381 | ||
382 | /* | |
383 | * Update i_blocks with the new blocks that got | |
384 | * allocated while adding extents for extent index | |
385 | * blocks. | |
386 | * | |
387 | * While converting to extents we need not | |
388 | * update the orignal inode i_blocks for extent blocks | |
389 | * via quota APIs. The quota update happened via tmp_inode already. | |
390 | */ | |
391 | spin_lock(&inode->i_lock); | |
392 | inode->i_blocks += tmp_inode->i_blocks; | |
393 | spin_unlock(&inode->i_lock); | |
8009f9fb | 394 | up_write(&EXT4_I(inode)->i_data_sem); |
c14c6fd5 | 395 | |
8009f9fb AK |
396 | /* |
397 | * We mark the inode dirty after, because we decrement the | |
398 | * i_blocks when freeing the indirect meta-data blocks | |
399 | */ | |
400 | retval = free_ind_block(handle, inode, i_data); | |
c14c6fd5 | 401 | ext4_mark_inode_dirty(handle, inode); |
8009f9fb | 402 | |
c14c6fd5 AK |
403 | err_out: |
404 | return retval; | |
405 | } | |
406 | ||
407 | static int free_ext_idx(handle_t *handle, struct inode *inode, | |
408 | struct ext4_extent_idx *ix) | |
409 | { | |
410 | int i, retval = 0; | |
411 | ext4_fsblk_t block; | |
412 | struct buffer_head *bh; | |
413 | struct ext4_extent_header *eh; | |
414 | ||
bf89d16f | 415 | block = ext4_idx_pblock(ix); |
c14c6fd5 AK |
416 | bh = sb_bread(inode->i_sb, block); |
417 | if (!bh) | |
418 | return -EIO; | |
419 | ||
420 | eh = (struct ext4_extent_header *)bh->b_data; | |
421 | if (eh->eh_depth != 0) { | |
422 | ix = EXT_FIRST_INDEX(eh); | |
423 | for (i = 0; i < le16_to_cpu(eh->eh_entries); i++, ix++) { | |
424 | retval = free_ext_idx(handle, inode, ix); | |
425 | if (retval) | |
426 | break; | |
427 | } | |
428 | } | |
429 | put_bh(bh); | |
8009f9fb | 430 | extend_credit_for_blkdel(handle, inode); |
7dc57615 | 431 | ext4_free_blocks(handle, inode, NULL, block, 1, |
e6362609 | 432 | EXT4_FREE_BLOCKS_METADATA | EXT4_FREE_BLOCKS_FORGET); |
c14c6fd5 AK |
433 | return retval; |
434 | } | |
435 | ||
436 | /* | |
437 | * Free the extent meta data blocks only | |
438 | */ | |
439 | static int free_ext_block(handle_t *handle, struct inode *inode) | |
440 | { | |
441 | int i, retval = 0; | |
442 | struct ext4_inode_info *ei = EXT4_I(inode); | |
443 | struct ext4_extent_header *eh = (struct ext4_extent_header *)ei->i_data; | |
444 | struct ext4_extent_idx *ix; | |
445 | if (eh->eh_depth == 0) | |
446 | /* | |
447 | * No extra blocks allocated for extent meta data | |
448 | */ | |
449 | return 0; | |
450 | ix = EXT_FIRST_INDEX(eh); | |
451 | for (i = 0; i < le16_to_cpu(eh->eh_entries); i++, ix++) { | |
452 | retval = free_ext_idx(handle, inode, ix); | |
453 | if (retval) | |
454 | return retval; | |
455 | } | |
456 | return retval; | |
457 | ||
458 | } | |
459 | ||
2a43a878 | 460 | int ext4_ext_migrate(struct inode *inode) |
c14c6fd5 AK |
461 | { |
462 | handle_t *handle; | |
463 | int retval = 0, i; | |
464 | __le32 *i_data; | |
465 | ext4_lblk_t blk_count = 0; | |
466 | struct ext4_inode_info *ei; | |
467 | struct inode *tmp_inode = NULL; | |
468 | struct list_blocks_struct lb; | |
469 | unsigned long max_entries; | |
11013911 | 470 | __u32 goal; |
c14c6fd5 | 471 | |
83982b6f TT |
472 | /* |
473 | * If the filesystem does not support extents, or the inode | |
474 | * already is extent-based, error out. | |
475 | */ | |
476 | if (!EXT4_HAS_INCOMPAT_FEATURE(inode->i_sb, | |
477 | EXT4_FEATURE_INCOMPAT_EXTENTS) || | |
12e9b892 | 478 | (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) |
c14c6fd5 AK |
479 | return -EINVAL; |
480 | ||
b8356c46 VC |
481 | if (S_ISLNK(inode->i_mode) && inode->i_blocks == 0) |
482 | /* | |
483 | * don't migrate fast symlink | |
484 | */ | |
485 | return retval; | |
486 | ||
c14c6fd5 AK |
487 | handle = ext4_journal_start(inode, |
488 | EXT4_DATA_TRANS_BLOCKS(inode->i_sb) + | |
489 | EXT4_INDEX_EXTRA_TRANS_BLOCKS + 3 + | |
5aca07eb | 490 | EXT4_MAXQUOTAS_INIT_BLOCKS(inode->i_sb) |
c14c6fd5 AK |
491 | + 1); |
492 | if (IS_ERR(handle)) { | |
493 | retval = PTR_ERR(handle); | |
09054264 | 494 | return retval; |
c14c6fd5 | 495 | } |
11013911 AD |
496 | goal = (((inode->i_ino - 1) / EXT4_INODES_PER_GROUP(inode->i_sb)) * |
497 | EXT4_INODES_PER_GROUP(inode->i_sb)) + 1; | |
f157a4aa | 498 | tmp_inode = ext4_new_inode(handle, inode->i_sb->s_root->d_inode, |
f1dffc4c | 499 | S_IFREG, NULL, goal); |
c14c6fd5 AK |
500 | if (IS_ERR(tmp_inode)) { |
501 | retval = -ENOMEM; | |
502 | ext4_journal_stop(handle); | |
09054264 | 503 | return retval; |
c14c6fd5 AK |
504 | } |
505 | i_size_write(tmp_inode, i_size_read(inode)); | |
506 | /* | |
f39490bc DM |
507 | * Set the i_nlink to zero so it will be deleted later |
508 | * when we drop inode reference. | |
c14c6fd5 | 509 | */ |
f39490bc | 510 | tmp_inode->i_nlink = 0; |
c14c6fd5 AK |
511 | |
512 | ext4_ext_tree_init(handle, tmp_inode); | |
513 | ext4_orphan_add(handle, tmp_inode); | |
514 | ext4_journal_stop(handle); | |
515 | ||
c14c6fd5 AK |
516 | /* |
517 | * start with one credit accounted for | |
518 | * superblock modification. | |
519 | * | |
520 | * For the tmp_inode we already have commited the | |
521 | * trascation that created the inode. Later as and | |
522 | * when we add extents we extent the journal | |
523 | */ | |
267e4db9 | 524 | /* |
1b9c12f4 TT |
525 | * Even though we take i_mutex we can still cause block |
526 | * allocation via mmap write to holes. If we have allocated | |
527 | * new blocks we fail migrate. New block allocation will | |
528 | * clear EXT4_STATE_EXT_MIGRATE flag. The flag is updated | |
529 | * with i_data_sem held to prevent racing with block | |
530 | * allocation. | |
267e4db9 AK |
531 | */ |
532 | down_read((&EXT4_I(inode)->i_data_sem)); | |
19f5fb7a | 533 | ext4_set_inode_state(inode, EXT4_STATE_EXT_MIGRATE); |
267e4db9 AK |
534 | up_read((&EXT4_I(inode)->i_data_sem)); |
535 | ||
c14c6fd5 | 536 | handle = ext4_journal_start(inode, 1); |
f39490bc DM |
537 | if (IS_ERR(handle)) { |
538 | /* | |
539 | * It is impossible to update on-disk structures without | |
540 | * a handle, so just rollback in-core changes and live other | |
541 | * work to orphan_list_cleanup() | |
542 | */ | |
543 | ext4_orphan_del(NULL, tmp_inode); | |
544 | retval = PTR_ERR(handle); | |
545 | goto out; | |
546 | } | |
8009f9fb AK |
547 | |
548 | ei = EXT4_I(inode); | |
549 | i_data = ei->i_data; | |
550 | memset(&lb, 0, sizeof(lb)); | |
551 | ||
552 | /* 32 bit block address 4 bytes */ | |
553 | max_entries = inode->i_sb->s_blocksize >> 2; | |
c14c6fd5 AK |
554 | for (i = 0; i < EXT4_NDIR_BLOCKS; i++, blk_count++) { |
555 | if (i_data[i]) { | |
556 | retval = update_extent_range(handle, tmp_inode, | |
557 | le32_to_cpu(i_data[i]), | |
558 | blk_count, &lb); | |
559 | if (retval) | |
560 | goto err_out; | |
561 | } | |
562 | } | |
563 | if (i_data[EXT4_IND_BLOCK]) { | |
564 | retval = update_ind_extent_range(handle, tmp_inode, | |
565 | le32_to_cpu(i_data[EXT4_IND_BLOCK]), | |
566 | &blk_count, &lb); | |
567 | if (retval) | |
568 | goto err_out; | |
569 | } else | |
570 | blk_count += max_entries; | |
571 | if (i_data[EXT4_DIND_BLOCK]) { | |
572 | retval = update_dind_extent_range(handle, tmp_inode, | |
573 | le32_to_cpu(i_data[EXT4_DIND_BLOCK]), | |
574 | &blk_count, &lb); | |
575 | if (retval) | |
576 | goto err_out; | |
577 | } else | |
578 | blk_count += max_entries * max_entries; | |
579 | if (i_data[EXT4_TIND_BLOCK]) { | |
580 | retval = update_tind_extent_range(handle, tmp_inode, | |
581 | le32_to_cpu(i_data[EXT4_TIND_BLOCK]), | |
582 | &blk_count, &lb); | |
583 | if (retval) | |
584 | goto err_out; | |
585 | } | |
586 | /* | |
587 | * Build the last extent | |
588 | */ | |
589 | retval = finish_range(handle, tmp_inode, &lb); | |
590 | err_out: | |
c14c6fd5 AK |
591 | if (retval) |
592 | /* | |
593 | * Failure case delete the extent information with the | |
594 | * tmp_inode | |
595 | */ | |
596 | free_ext_block(handle, tmp_inode); | |
267e4db9 AK |
597 | else { |
598 | retval = ext4_ext_swap_inode_data(handle, inode, tmp_inode); | |
599 | if (retval) | |
600 | /* | |
601 | * if we fail to swap inode data free the extent | |
602 | * details of the tmp inode | |
603 | */ | |
604 | free_ext_block(handle, tmp_inode); | |
605 | } | |
8009f9fb AK |
606 | |
607 | /* We mark the tmp_inode dirty via ext4_ext_tree_init. */ | |
608 | if (ext4_journal_extend(handle, 1) != 0) | |
609 | ext4_journal_restart(handle, 1); | |
c14c6fd5 AK |
610 | |
611 | /* | |
612 | * Mark the tmp_inode as of size zero | |
613 | */ | |
614 | i_size_write(tmp_inode, 0); | |
615 | ||
616 | /* | |
617 | * set the i_blocks count to zero | |
618 | * so that the ext4_delete_inode does the | |
619 | * right job | |
620 | * | |
621 | * We don't need to take the i_lock because | |
622 | * the inode is not visible to user space. | |
623 | */ | |
624 | tmp_inode->i_blocks = 0; | |
625 | ||
626 | /* Reset the extent details */ | |
627 | ext4_ext_tree_init(handle, tmp_inode); | |
c14c6fd5 | 628 | ext4_journal_stop(handle); |
f39490bc | 629 | out: |
a8526e84 | 630 | unlock_new_inode(tmp_inode); |
09054264 | 631 | iput(tmp_inode); |
c14c6fd5 AK |
632 | |
633 | return retval; | |
634 | } |