Commit | Line | Data |
---|---|---|
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 | ||
5a0e3ad6 | 15 | #include <linux/slab.h> |
3dcf5451 | 16 | #include "ext4_jbd2.h" |
4a092d73 | 17 | #include "ext4_extents.h" |
c14c6fd5 AK |
18 | |
19 | /* | |
20 | * The contiguous blocks details which can be | |
21 | * represented by a single extent | |
22 | */ | |
fba90ffe DM |
23 | struct migrate_struct { |
24 | ext4_lblk_t first_block, last_block, curr_block; | |
c14c6fd5 AK |
25 | ext4_fsblk_t first_pblock, last_pblock; |
26 | }; | |
27 | ||
28 | static int finish_range(handle_t *handle, struct inode *inode, | |
fba90ffe | 29 | struct migrate_struct *lb) |
c14c6fd5 AK |
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); | |
4b1f1660 DM |
42 | /* Locking only for convinience since we are operating on temp inode */ |
43 | down_write(&EXT4_I(inode)->i_data_sem); | |
107a7bd3 | 44 | path = ext4_ext_find_extent(inode, lb->first_block, NULL, 0); |
c14c6fd5 AK |
45 | |
46 | if (IS_ERR(path)) { | |
47 | retval = PTR_ERR(path); | |
b35905c1 | 48 | path = NULL; |
c14c6fd5 AK |
49 | goto err_out; |
50 | } | |
51 | ||
52 | /* | |
53 | * Calculate the credit needed to inserting this extent | |
54 | * Since we are doing this in loop we may accumalate extra | |
55 | * credit. But below we try to not accumalate too much | |
56 | * of them by restarting the journal. | |
57 | */ | |
ee12b630 MC |
58 | needed = ext4_ext_calc_credits_for_single_extent(inode, |
59 | lb->last_block - lb->first_block + 1, path); | |
c14c6fd5 AK |
60 | |
61 | /* | |
62 | * Make sure the credit we accumalated is not really high | |
63 | */ | |
0390131b FM |
64 | if (needed && ext4_handle_has_enough_credits(handle, |
65 | EXT4_RESERVE_TRANS_BLOCKS)) { | |
4b1f1660 | 66 | up_write((&EXT4_I(inode)->i_data_sem)); |
c14c6fd5 | 67 | retval = ext4_journal_restart(handle, needed); |
4b1f1660 | 68 | down_write((&EXT4_I(inode)->i_data_sem)); |
c14c6fd5 AK |
69 | if (retval) |
70 | goto err_out; | |
8009f9fb | 71 | } else if (needed) { |
c14c6fd5 | 72 | retval = ext4_journal_extend(handle, needed); |
8009f9fb | 73 | if (retval) { |
c14c6fd5 AK |
74 | /* |
75 | * IF not able to extend the journal restart the journal | |
76 | */ | |
4b1f1660 | 77 | up_write((&EXT4_I(inode)->i_data_sem)); |
c14c6fd5 | 78 | retval = ext4_journal_restart(handle, needed); |
4b1f1660 | 79 | down_write((&EXT4_I(inode)->i_data_sem)); |
c14c6fd5 AK |
80 | if (retval) |
81 | goto err_out; | |
82 | } | |
83 | } | |
dfe50809 | 84 | retval = ext4_ext_insert_extent(handle, inode, &path, &newext, 0); |
c14c6fd5 | 85 | err_out: |
4b1f1660 | 86 | up_write((&EXT4_I(inode)->i_data_sem)); |
b35905c1 AK |
87 | if (path) { |
88 | ext4_ext_drop_refs(path); | |
89 | kfree(path); | |
90 | } | |
c14c6fd5 AK |
91 | lb->first_pblock = 0; |
92 | return retval; | |
93 | } | |
94 | ||
95 | static int update_extent_range(handle_t *handle, struct inode *inode, | |
fba90ffe | 96 | ext4_fsblk_t pblock, struct migrate_struct *lb) |
c14c6fd5 AK |
97 | { |
98 | int retval; | |
99 | /* | |
100 | * See if we can add on to the existing range (if it exists) | |
101 | */ | |
102 | if (lb->first_pblock && | |
103 | (lb->last_pblock+1 == pblock) && | |
fba90ffe | 104 | (lb->last_block+1 == lb->curr_block)) { |
c14c6fd5 | 105 | lb->last_pblock = pblock; |
fba90ffe DM |
106 | lb->last_block = lb->curr_block; |
107 | lb->curr_block++; | |
c14c6fd5 AK |
108 | return 0; |
109 | } | |
110 | /* | |
111 | * Start a new range. | |
112 | */ | |
113 | retval = finish_range(handle, inode, lb); | |
114 | lb->first_pblock = lb->last_pblock = pblock; | |
fba90ffe DM |
115 | lb->first_block = lb->last_block = lb->curr_block; |
116 | lb->curr_block++; | |
c14c6fd5 AK |
117 | return retval; |
118 | } | |
119 | ||
120 | static int update_ind_extent_range(handle_t *handle, struct inode *inode, | |
fba90ffe DM |
121 | ext4_fsblk_t pblock, |
122 | struct migrate_struct *lb) | |
c14c6fd5 AK |
123 | { |
124 | struct buffer_head *bh; | |
125 | __le32 *i_data; | |
126 | int i, retval = 0; | |
c14c6fd5 AK |
127 | unsigned long max_entries = inode->i_sb->s_blocksize >> 2; |
128 | ||
c14c6fd5 AK |
129 | bh = sb_bread(inode->i_sb, pblock); |
130 | if (!bh) | |
131 | return -EIO; | |
132 | ||
133 | i_data = (__le32 *)bh->b_data; | |
fba90ffe | 134 | for (i = 0; i < max_entries; i++) { |
c14c6fd5 AK |
135 | if (i_data[i]) { |
136 | retval = update_extent_range(handle, inode, | |
fba90ffe | 137 | le32_to_cpu(i_data[i]), lb); |
c14c6fd5 AK |
138 | if (retval) |
139 | break; | |
fba90ffe DM |
140 | } else { |
141 | lb->curr_block++; | |
c14c6fd5 AK |
142 | } |
143 | } | |
c14c6fd5 AK |
144 | put_bh(bh); |
145 | return retval; | |
146 | ||
147 | } | |
148 | ||
149 | static int update_dind_extent_range(handle_t *handle, struct inode *inode, | |
fba90ffe DM |
150 | ext4_fsblk_t pblock, |
151 | struct migrate_struct *lb) | |
c14c6fd5 AK |
152 | { |
153 | struct buffer_head *bh; | |
154 | __le32 *i_data; | |
155 | int i, retval = 0; | |
c14c6fd5 AK |
156 | unsigned long max_entries = inode->i_sb->s_blocksize >> 2; |
157 | ||
c14c6fd5 AK |
158 | bh = sb_bread(inode->i_sb, pblock); |
159 | if (!bh) | |
160 | return -EIO; | |
161 | ||
162 | i_data = (__le32 *)bh->b_data; | |
163 | for (i = 0; i < max_entries; i++) { | |
164 | if (i_data[i]) { | |
165 | retval = update_ind_extent_range(handle, inode, | |
fba90ffe | 166 | le32_to_cpu(i_data[i]), lb); |
c14c6fd5 AK |
167 | if (retval) |
168 | break; | |
169 | } else { | |
170 | /* Only update the file block number */ | |
fba90ffe | 171 | lb->curr_block += max_entries; |
c14c6fd5 AK |
172 | } |
173 | } | |
c14c6fd5 AK |
174 | put_bh(bh); |
175 | return retval; | |
176 | ||
177 | } | |
178 | ||
179 | static int update_tind_extent_range(handle_t *handle, struct inode *inode, | |
fba90ffe DM |
180 | ext4_fsblk_t pblock, |
181 | struct migrate_struct *lb) | |
c14c6fd5 AK |
182 | { |
183 | struct buffer_head *bh; | |
184 | __le32 *i_data; | |
185 | int i, retval = 0; | |
c14c6fd5 AK |
186 | unsigned long max_entries = inode->i_sb->s_blocksize >> 2; |
187 | ||
c14c6fd5 AK |
188 | bh = sb_bread(inode->i_sb, pblock); |
189 | if (!bh) | |
190 | return -EIO; | |
191 | ||
192 | i_data = (__le32 *)bh->b_data; | |
193 | for (i = 0; i < max_entries; i++) { | |
194 | if (i_data[i]) { | |
195 | retval = update_dind_extent_range(handle, inode, | |
fba90ffe | 196 | le32_to_cpu(i_data[i]), lb); |
c14c6fd5 AK |
197 | if (retval) |
198 | break; | |
fba90ffe | 199 | } else { |
c14c6fd5 | 200 | /* Only update the file block number */ |
fba90ffe DM |
201 | lb->curr_block += max_entries * max_entries; |
202 | } | |
c14c6fd5 | 203 | } |
c14c6fd5 AK |
204 | put_bh(bh); |
205 | return retval; | |
206 | ||
207 | } | |
208 | ||
8009f9fb AK |
209 | static int extend_credit_for_blkdel(handle_t *handle, struct inode *inode) |
210 | { | |
211 | int retval = 0, needed; | |
212 | ||
0390131b | 213 | if (ext4_handle_has_enough_credits(handle, EXT4_RESERVE_TRANS_BLOCKS+1)) |
8009f9fb AK |
214 | return 0; |
215 | /* | |
216 | * We are freeing a blocks. During this we touch | |
217 | * superblock, group descriptor and block bitmap. | |
218 | * So allocate a credit of 3. We may update | |
219 | * quota (user and group). | |
220 | */ | |
5aca07eb | 221 | needed = 3 + EXT4_MAXQUOTAS_TRANS_BLOCKS(inode->i_sb); |
8009f9fb AK |
222 | |
223 | if (ext4_journal_extend(handle, needed) != 0) | |
224 | retval = ext4_journal_restart(handle, needed); | |
225 | ||
226 | return retval; | |
227 | } | |
228 | ||
c14c6fd5 AK |
229 | static int free_dind_blocks(handle_t *handle, |
230 | struct inode *inode, __le32 i_data) | |
231 | { | |
232 | int i; | |
233 | __le32 *tmp_idata; | |
234 | struct buffer_head *bh; | |
235 | unsigned long max_entries = inode->i_sb->s_blocksize >> 2; | |
236 | ||
237 | bh = sb_bread(inode->i_sb, le32_to_cpu(i_data)); | |
238 | if (!bh) | |
239 | return -EIO; | |
240 | ||
241 | tmp_idata = (__le32 *)bh->b_data; | |
242 | for (i = 0; i < max_entries; i++) { | |
8009f9fb AK |
243 | if (tmp_idata[i]) { |
244 | extend_credit_for_blkdel(handle, inode); | |
7dc57615 | 245 | ext4_free_blocks(handle, inode, NULL, |
e6362609 TT |
246 | le32_to_cpu(tmp_idata[i]), 1, |
247 | EXT4_FREE_BLOCKS_METADATA | | |
248 | EXT4_FREE_BLOCKS_FORGET); | |
8009f9fb | 249 | } |
c14c6fd5 AK |
250 | } |
251 | put_bh(bh); | |
8009f9fb | 252 | extend_credit_for_blkdel(handle, inode); |
7dc57615 | 253 | ext4_free_blocks(handle, inode, NULL, le32_to_cpu(i_data), 1, |
e6362609 TT |
254 | EXT4_FREE_BLOCKS_METADATA | |
255 | EXT4_FREE_BLOCKS_FORGET); | |
c14c6fd5 AK |
256 | return 0; |
257 | } | |
258 | ||
259 | static int free_tind_blocks(handle_t *handle, | |
260 | struct inode *inode, __le32 i_data) | |
261 | { | |
262 | int i, retval = 0; | |
263 | __le32 *tmp_idata; | |
264 | struct buffer_head *bh; | |
265 | unsigned long max_entries = inode->i_sb->s_blocksize >> 2; | |
266 | ||
267 | bh = sb_bread(inode->i_sb, le32_to_cpu(i_data)); | |
268 | if (!bh) | |
269 | return -EIO; | |
270 | ||
271 | tmp_idata = (__le32 *)bh->b_data; | |
272 | for (i = 0; i < max_entries; i++) { | |
273 | if (tmp_idata[i]) { | |
274 | retval = free_dind_blocks(handle, | |
275 | inode, tmp_idata[i]); | |
276 | if (retval) { | |
277 | put_bh(bh); | |
278 | return retval; | |
279 | } | |
280 | } | |
281 | } | |
282 | put_bh(bh); | |
8009f9fb | 283 | extend_credit_for_blkdel(handle, inode); |
7dc57615 | 284 | ext4_free_blocks(handle, inode, NULL, le32_to_cpu(i_data), 1, |
e6362609 TT |
285 | EXT4_FREE_BLOCKS_METADATA | |
286 | EXT4_FREE_BLOCKS_FORGET); | |
c14c6fd5 AK |
287 | return 0; |
288 | } | |
289 | ||
8009f9fb | 290 | static int free_ind_block(handle_t *handle, struct inode *inode, __le32 *i_data) |
c14c6fd5 AK |
291 | { |
292 | int retval; | |
c14c6fd5 | 293 | |
8009f9fb AK |
294 | /* ei->i_data[EXT4_IND_BLOCK] */ |
295 | if (i_data[0]) { | |
296 | extend_credit_for_blkdel(handle, inode); | |
7dc57615 | 297 | ext4_free_blocks(handle, inode, NULL, |
e6362609 TT |
298 | le32_to_cpu(i_data[0]), 1, |
299 | EXT4_FREE_BLOCKS_METADATA | | |
300 | EXT4_FREE_BLOCKS_FORGET); | |
8009f9fb | 301 | } |
c14c6fd5 | 302 | |
8009f9fb AK |
303 | /* ei->i_data[EXT4_DIND_BLOCK] */ |
304 | if (i_data[1]) { | |
305 | retval = free_dind_blocks(handle, inode, i_data[1]); | |
c14c6fd5 AK |
306 | if (retval) |
307 | return retval; | |
308 | } | |
309 | ||
8009f9fb AK |
310 | /* ei->i_data[EXT4_TIND_BLOCK] */ |
311 | if (i_data[2]) { | |
312 | retval = free_tind_blocks(handle, inode, i_data[2]); | |
c14c6fd5 AK |
313 | if (retval) |
314 | return retval; | |
315 | } | |
316 | return 0; | |
317 | } | |
318 | ||
319 | static int ext4_ext_swap_inode_data(handle_t *handle, struct inode *inode, | |
267e4db9 | 320 | struct inode *tmp_inode) |
c14c6fd5 | 321 | { |
8009f9fb AK |
322 | int retval; |
323 | __le32 i_data[3]; | |
c14c6fd5 AK |
324 | struct ext4_inode_info *ei = EXT4_I(inode); |
325 | struct ext4_inode_info *tmp_ei = EXT4_I(tmp_inode); | |
326 | ||
c14c6fd5 AK |
327 | /* |
328 | * One credit accounted for writing the | |
329 | * i_data field of the original inode | |
330 | */ | |
331 | retval = ext4_journal_extend(handle, 1); | |
267e4db9 | 332 | if (retval) { |
c14c6fd5 AK |
333 | retval = ext4_journal_restart(handle, 1); |
334 | if (retval) | |
335 | goto err_out; | |
336 | } | |
337 | ||
8009f9fb AK |
338 | i_data[0] = ei->i_data[EXT4_IND_BLOCK]; |
339 | i_data[1] = ei->i_data[EXT4_DIND_BLOCK]; | |
340 | i_data[2] = ei->i_data[EXT4_TIND_BLOCK]; | |
341 | ||
342 | down_write(&EXT4_I(inode)->i_data_sem); | |
267e4db9 | 343 | /* |
1b9c12f4 | 344 | * if EXT4_STATE_EXT_MIGRATE is cleared a block allocation |
267e4db9 AK |
345 | * happened after we started the migrate. We need to |
346 | * fail the migrate | |
347 | */ | |
19f5fb7a | 348 | if (!ext4_test_inode_state(inode, EXT4_STATE_EXT_MIGRATE)) { |
267e4db9 AK |
349 | retval = -EAGAIN; |
350 | up_write(&EXT4_I(inode)->i_data_sem); | |
351 | goto err_out; | |
352 | } else | |
19f5fb7a | 353 | ext4_clear_inode_state(inode, EXT4_STATE_EXT_MIGRATE); |
c14c6fd5 AK |
354 | /* |
355 | * We have the extent map build with the tmp inode. | |
356 | * Now copy the i_data across | |
357 | */ | |
74e4e6db | 358 | ext4_set_inode_flag(inode, EXT4_INODE_EXTENTS); |
c14c6fd5 AK |
359 | memcpy(ei->i_data, tmp_ei->i_data, sizeof(ei->i_data)); |
360 | ||
361 | /* | |
362 | * Update i_blocks with the new blocks that got | |
363 | * allocated while adding extents for extent index | |
364 | * blocks. | |
365 | * | |
366 | * While converting to extents we need not | |
367 | * update the orignal inode i_blocks for extent blocks | |
368 | * via quota APIs. The quota update happened via tmp_inode already. | |
369 | */ | |
370 | spin_lock(&inode->i_lock); | |
371 | inode->i_blocks += tmp_inode->i_blocks; | |
372 | spin_unlock(&inode->i_lock); | |
8009f9fb | 373 | up_write(&EXT4_I(inode)->i_data_sem); |
c14c6fd5 | 374 | |
8009f9fb AK |
375 | /* |
376 | * We mark the inode dirty after, because we decrement the | |
377 | * i_blocks when freeing the indirect meta-data blocks | |
378 | */ | |
379 | retval = free_ind_block(handle, inode, i_data); | |
c14c6fd5 | 380 | ext4_mark_inode_dirty(handle, inode); |
8009f9fb | 381 | |
c14c6fd5 AK |
382 | err_out: |
383 | return retval; | |
384 | } | |
385 | ||
386 | static int free_ext_idx(handle_t *handle, struct inode *inode, | |
387 | struct ext4_extent_idx *ix) | |
388 | { | |
389 | int i, retval = 0; | |
390 | ext4_fsblk_t block; | |
391 | struct buffer_head *bh; | |
392 | struct ext4_extent_header *eh; | |
393 | ||
bf89d16f | 394 | block = ext4_idx_pblock(ix); |
c14c6fd5 AK |
395 | bh = sb_bread(inode->i_sb, block); |
396 | if (!bh) | |
397 | return -EIO; | |
398 | ||
399 | eh = (struct ext4_extent_header *)bh->b_data; | |
400 | if (eh->eh_depth != 0) { | |
401 | ix = EXT_FIRST_INDEX(eh); | |
402 | for (i = 0; i < le16_to_cpu(eh->eh_entries); i++, ix++) { | |
403 | retval = free_ext_idx(handle, inode, ix); | |
404 | if (retval) | |
405 | break; | |
406 | } | |
407 | } | |
408 | put_bh(bh); | |
8009f9fb | 409 | extend_credit_for_blkdel(handle, inode); |
7dc57615 | 410 | ext4_free_blocks(handle, inode, NULL, block, 1, |
e6362609 | 411 | EXT4_FREE_BLOCKS_METADATA | EXT4_FREE_BLOCKS_FORGET); |
c14c6fd5 AK |
412 | return retval; |
413 | } | |
414 | ||
415 | /* | |
416 | * Free the extent meta data blocks only | |
417 | */ | |
418 | static int free_ext_block(handle_t *handle, struct inode *inode) | |
419 | { | |
420 | int i, retval = 0; | |
421 | struct ext4_inode_info *ei = EXT4_I(inode); | |
422 | struct ext4_extent_header *eh = (struct ext4_extent_header *)ei->i_data; | |
423 | struct ext4_extent_idx *ix; | |
424 | if (eh->eh_depth == 0) | |
425 | /* | |
426 | * No extra blocks allocated for extent meta data | |
427 | */ | |
428 | return 0; | |
429 | ix = EXT_FIRST_INDEX(eh); | |
430 | for (i = 0; i < le16_to_cpu(eh->eh_entries); i++, ix++) { | |
431 | retval = free_ext_idx(handle, inode, ix); | |
432 | if (retval) | |
433 | return retval; | |
434 | } | |
435 | return retval; | |
c14c6fd5 AK |
436 | } |
437 | ||
2a43a878 | 438 | int ext4_ext_migrate(struct inode *inode) |
c14c6fd5 AK |
439 | { |
440 | handle_t *handle; | |
441 | int retval = 0, i; | |
442 | __le32 *i_data; | |
c14c6fd5 AK |
443 | struct ext4_inode_info *ei; |
444 | struct inode *tmp_inode = NULL; | |
fba90ffe | 445 | struct migrate_struct lb; |
c14c6fd5 | 446 | unsigned long max_entries; |
11013911 | 447 | __u32 goal; |
5cb81dab | 448 | uid_t owner[2]; |
c14c6fd5 | 449 | |
83982b6f TT |
450 | /* |
451 | * If the filesystem does not support extents, or the inode | |
452 | * already is extent-based, error out. | |
453 | */ | |
454 | if (!EXT4_HAS_INCOMPAT_FEATURE(inode->i_sb, | |
455 | EXT4_FEATURE_INCOMPAT_EXTENTS) || | |
12e9b892 | 456 | (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) |
c14c6fd5 AK |
457 | return -EINVAL; |
458 | ||
b8356c46 VC |
459 | if (S_ISLNK(inode->i_mode) && inode->i_blocks == 0) |
460 | /* | |
461 | * don't migrate fast symlink | |
462 | */ | |
463 | return retval; | |
464 | ||
4b217630 TT |
465 | /* |
466 | * Worst case we can touch the allocation bitmaps, a bgd | |
467 | * block, and a block to link in the orphan list. We do need | |
468 | * need to worry about credits for modifying the quota inode. | |
469 | */ | |
9924a92a | 470 | handle = ext4_journal_start(inode, EXT4_HT_MIGRATE, |
4b217630 TT |
471 | 4 + EXT4_MAXQUOTAS_TRANS_BLOCKS(inode->i_sb)); |
472 | ||
c14c6fd5 AK |
473 | if (IS_ERR(handle)) { |
474 | retval = PTR_ERR(handle); | |
09054264 | 475 | return retval; |
c14c6fd5 | 476 | } |
11013911 AD |
477 | goal = (((inode->i_ino - 1) / EXT4_INODES_PER_GROUP(inode->i_sb)) * |
478 | EXT4_INODES_PER_GROUP(inode->i_sb)) + 1; | |
08cefc7a EB |
479 | owner[0] = i_uid_read(inode); |
480 | owner[1] = i_gid_read(inode); | |
f157a4aa | 481 | tmp_inode = ext4_new_inode(handle, inode->i_sb->s_root->d_inode, |
5cb81dab | 482 | S_IFREG, NULL, goal, owner); |
c14c6fd5 | 483 | if (IS_ERR(tmp_inode)) { |
a0cc910f | 484 | retval = PTR_ERR(tmp_inode); |
c14c6fd5 | 485 | ext4_journal_stop(handle); |
09054264 | 486 | return retval; |
c14c6fd5 AK |
487 | } |
488 | i_size_write(tmp_inode, i_size_read(inode)); | |
489 | /* | |
f39490bc DM |
490 | * Set the i_nlink to zero so it will be deleted later |
491 | * when we drop inode reference. | |
c14c6fd5 | 492 | */ |
6d6b77f1 | 493 | clear_nlink(tmp_inode); |
c14c6fd5 AK |
494 | |
495 | ext4_ext_tree_init(handle, tmp_inode); | |
496 | ext4_orphan_add(handle, tmp_inode); | |
497 | ext4_journal_stop(handle); | |
498 | ||
c14c6fd5 AK |
499 | /* |
500 | * start with one credit accounted for | |
501 | * superblock modification. | |
502 | * | |
25985edc | 503 | * For the tmp_inode we already have committed the |
70261f56 | 504 | * transaction that created the inode. Later as and |
c14c6fd5 AK |
505 | * when we add extents we extent the journal |
506 | */ | |
267e4db9 | 507 | /* |
1b9c12f4 TT |
508 | * Even though we take i_mutex we can still cause block |
509 | * allocation via mmap write to holes. If we have allocated | |
510 | * new blocks we fail migrate. New block allocation will | |
511 | * clear EXT4_STATE_EXT_MIGRATE flag. The flag is updated | |
512 | * with i_data_sem held to prevent racing with block | |
513 | * allocation. | |
267e4db9 | 514 | */ |
c8b459f4 | 515 | down_read(&EXT4_I(inode)->i_data_sem); |
19f5fb7a | 516 | ext4_set_inode_state(inode, EXT4_STATE_EXT_MIGRATE); |
267e4db9 AK |
517 | up_read((&EXT4_I(inode)->i_data_sem)); |
518 | ||
9924a92a | 519 | handle = ext4_journal_start(inode, EXT4_HT_MIGRATE, 1); |
f39490bc DM |
520 | if (IS_ERR(handle)) { |
521 | /* | |
522 | * It is impossible to update on-disk structures without | |
523 | * a handle, so just rollback in-core changes and live other | |
524 | * work to orphan_list_cleanup() | |
525 | */ | |
526 | ext4_orphan_del(NULL, tmp_inode); | |
527 | retval = PTR_ERR(handle); | |
528 | goto out; | |
529 | } | |
8009f9fb AK |
530 | |
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; | |
fba90ffe | 537 | for (i = 0; i < EXT4_NDIR_BLOCKS; i++) { |
c14c6fd5 AK |
538 | if (i_data[i]) { |
539 | retval = update_extent_range(handle, tmp_inode, | |
fba90ffe | 540 | le32_to_cpu(i_data[i]), &lb); |
c14c6fd5 AK |
541 | if (retval) |
542 | goto err_out; | |
fba90ffe DM |
543 | } else |
544 | lb.curr_block++; | |
c14c6fd5 AK |
545 | } |
546 | if (i_data[EXT4_IND_BLOCK]) { | |
547 | retval = update_ind_extent_range(handle, tmp_inode, | |
fba90ffe | 548 | le32_to_cpu(i_data[EXT4_IND_BLOCK]), &lb); |
c14c6fd5 AK |
549 | if (retval) |
550 | goto err_out; | |
551 | } else | |
fba90ffe | 552 | lb.curr_block += max_entries; |
c14c6fd5 AK |
553 | if (i_data[EXT4_DIND_BLOCK]) { |
554 | retval = update_dind_extent_range(handle, tmp_inode, | |
fba90ffe | 555 | le32_to_cpu(i_data[EXT4_DIND_BLOCK]), &lb); |
c14c6fd5 AK |
556 | if (retval) |
557 | goto err_out; | |
558 | } else | |
fba90ffe | 559 | lb.curr_block += max_entries * max_entries; |
c14c6fd5 AK |
560 | if (i_data[EXT4_TIND_BLOCK]) { |
561 | retval = update_tind_extent_range(handle, tmp_inode, | |
fba90ffe | 562 | le32_to_cpu(i_data[EXT4_TIND_BLOCK]), &lb); |
c14c6fd5 AK |
563 | if (retval) |
564 | goto err_out; | |
565 | } | |
566 | /* | |
567 | * Build the last extent | |
568 | */ | |
569 | retval = finish_range(handle, tmp_inode, &lb); | |
570 | err_out: | |
c14c6fd5 AK |
571 | if (retval) |
572 | /* | |
573 | * Failure case delete the extent information with the | |
574 | * tmp_inode | |
575 | */ | |
576 | free_ext_block(handle, tmp_inode); | |
267e4db9 AK |
577 | else { |
578 | retval = ext4_ext_swap_inode_data(handle, inode, tmp_inode); | |
579 | if (retval) | |
580 | /* | |
581 | * if we fail to swap inode data free the extent | |
582 | * details of the tmp inode | |
583 | */ | |
584 | free_ext_block(handle, tmp_inode); | |
585 | } | |
8009f9fb AK |
586 | |
587 | /* We mark the tmp_inode dirty via ext4_ext_tree_init. */ | |
588 | if (ext4_journal_extend(handle, 1) != 0) | |
589 | ext4_journal_restart(handle, 1); | |
c14c6fd5 AK |
590 | |
591 | /* | |
592 | * Mark the tmp_inode as of size zero | |
593 | */ | |
594 | i_size_write(tmp_inode, 0); | |
595 | ||
596 | /* | |
597 | * set the i_blocks count to zero | |
598 | * so that the ext4_delete_inode does the | |
599 | * right job | |
600 | * | |
601 | * We don't need to take the i_lock because | |
602 | * the inode is not visible to user space. | |
603 | */ | |
604 | tmp_inode->i_blocks = 0; | |
605 | ||
606 | /* Reset the extent details */ | |
607 | ext4_ext_tree_init(handle, tmp_inode); | |
c14c6fd5 | 608 | ext4_journal_stop(handle); |
f39490bc | 609 | out: |
a8526e84 | 610 | unlock_new_inode(tmp_inode); |
09054264 | 611 | iput(tmp_inode); |
c14c6fd5 AK |
612 | |
613 | return retval; | |
614 | } | |
0d14b098 LC |
615 | |
616 | /* | |
617 | * Migrate a simple extent-based inode to use the i_blocks[] array | |
618 | */ | |
619 | int ext4_ind_migrate(struct inode *inode) | |
620 | { | |
621 | struct ext4_extent_header *eh; | |
622 | struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es; | |
623 | struct ext4_inode_info *ei = EXT4_I(inode); | |
624 | struct ext4_extent *ex; | |
625 | unsigned int i, len; | |
626 | ext4_fsblk_t blk; | |
627 | handle_t *handle; | |
628 | int ret; | |
629 | ||
630 | if (!EXT4_HAS_INCOMPAT_FEATURE(inode->i_sb, | |
631 | EXT4_FEATURE_INCOMPAT_EXTENTS) || | |
632 | (!ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) | |
633 | return -EINVAL; | |
634 | ||
43e50f50 LC |
635 | if (EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb, |
636 | EXT4_FEATURE_RO_COMPAT_BIGALLOC)) | |
637 | return -EOPNOTSUPP; | |
638 | ||
0d14b098 LC |
639 | handle = ext4_journal_start(inode, EXT4_HT_MIGRATE, 1); |
640 | if (IS_ERR(handle)) | |
641 | return PTR_ERR(handle); | |
642 | ||
643 | down_write(&EXT4_I(inode)->i_data_sem); | |
644 | ret = ext4_ext_check_inode(inode); | |
645 | if (ret) | |
646 | goto errout; | |
647 | ||
648 | eh = ext_inode_hdr(inode); | |
649 | ex = EXT_FIRST_EXTENT(eh); | |
650 | if (ext4_blocks_count(es) > EXT4_MAX_BLOCK_FILE_PHYS || | |
651 | eh->eh_depth != 0 || le16_to_cpu(eh->eh_entries) > 1) { | |
652 | ret = -EOPNOTSUPP; | |
653 | goto errout; | |
654 | } | |
655 | if (eh->eh_entries == 0) | |
656 | blk = len = 0; | |
657 | else { | |
658 | len = le16_to_cpu(ex->ee_len); | |
659 | blk = ext4_ext_pblock(ex); | |
660 | if (len > EXT4_NDIR_BLOCKS) { | |
661 | ret = -EOPNOTSUPP; | |
662 | goto errout; | |
663 | } | |
664 | } | |
665 | ||
666 | ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS); | |
667 | memset(ei->i_data, 0, sizeof(ei->i_data)); | |
668 | for (i=0; i < len; i++) | |
669 | ei->i_data[i] = cpu_to_le32(blk++); | |
670 | ext4_mark_inode_dirty(handle, inode); | |
671 | errout: | |
672 | ext4_journal_stop(handle); | |
673 | up_write(&EXT4_I(inode)->i_data_sem); | |
674 | return ret; | |
675 | } |