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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 | ||
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)); |
b7ea89ad TT |
87 | ext4_ext_drop_refs(path); |
88 | kfree(path); | |
c14c6fd5 AK |
89 | lb->first_pblock = 0; |
90 | return retval; | |
91 | } | |
92 | ||
93 | static int update_extent_range(handle_t *handle, struct inode *inode, | |
fba90ffe | 94 | ext4_fsblk_t pblock, struct migrate_struct *lb) |
c14c6fd5 AK |
95 | { |
96 | int retval; | |
97 | /* | |
98 | * See if we can add on to the existing range (if it exists) | |
99 | */ | |
100 | if (lb->first_pblock && | |
101 | (lb->last_pblock+1 == pblock) && | |
fba90ffe | 102 | (lb->last_block+1 == lb->curr_block)) { |
c14c6fd5 | 103 | lb->last_pblock = pblock; |
fba90ffe DM |
104 | lb->last_block = lb->curr_block; |
105 | lb->curr_block++; | |
c14c6fd5 AK |
106 | return 0; |
107 | } | |
108 | /* | |
109 | * Start a new range. | |
110 | */ | |
111 | retval = finish_range(handle, inode, lb); | |
112 | lb->first_pblock = lb->last_pblock = pblock; | |
fba90ffe DM |
113 | lb->first_block = lb->last_block = lb->curr_block; |
114 | lb->curr_block++; | |
c14c6fd5 AK |
115 | return retval; |
116 | } | |
117 | ||
118 | static int update_ind_extent_range(handle_t *handle, struct inode *inode, | |
fba90ffe DM |
119 | ext4_fsblk_t pblock, |
120 | struct migrate_struct *lb) | |
c14c6fd5 AK |
121 | { |
122 | struct buffer_head *bh; | |
123 | __le32 *i_data; | |
124 | int i, retval = 0; | |
c14c6fd5 AK |
125 | unsigned long max_entries = inode->i_sb->s_blocksize >> 2; |
126 | ||
c14c6fd5 AK |
127 | bh = sb_bread(inode->i_sb, pblock); |
128 | if (!bh) | |
129 | return -EIO; | |
130 | ||
131 | i_data = (__le32 *)bh->b_data; | |
fba90ffe | 132 | for (i = 0; i < max_entries; i++) { |
c14c6fd5 AK |
133 | if (i_data[i]) { |
134 | retval = update_extent_range(handle, inode, | |
fba90ffe | 135 | le32_to_cpu(i_data[i]), lb); |
c14c6fd5 AK |
136 | if (retval) |
137 | break; | |
fba90ffe DM |
138 | } else { |
139 | lb->curr_block++; | |
c14c6fd5 AK |
140 | } |
141 | } | |
c14c6fd5 AK |
142 | put_bh(bh); |
143 | return retval; | |
144 | ||
145 | } | |
146 | ||
147 | static int update_dind_extent_range(handle_t *handle, struct inode *inode, | |
fba90ffe DM |
148 | ext4_fsblk_t pblock, |
149 | struct migrate_struct *lb) | |
c14c6fd5 AK |
150 | { |
151 | struct buffer_head *bh; | |
152 | __le32 *i_data; | |
153 | int i, retval = 0; | |
c14c6fd5 AK |
154 | unsigned long max_entries = inode->i_sb->s_blocksize >> 2; |
155 | ||
c14c6fd5 AK |
156 | bh = sb_bread(inode->i_sb, pblock); |
157 | if (!bh) | |
158 | return -EIO; | |
159 | ||
160 | i_data = (__le32 *)bh->b_data; | |
161 | for (i = 0; i < max_entries; i++) { | |
162 | if (i_data[i]) { | |
163 | retval = update_ind_extent_range(handle, inode, | |
fba90ffe | 164 | le32_to_cpu(i_data[i]), lb); |
c14c6fd5 AK |
165 | if (retval) |
166 | break; | |
167 | } else { | |
168 | /* Only update the file block number */ | |
fba90ffe | 169 | lb->curr_block += max_entries; |
c14c6fd5 AK |
170 | } |
171 | } | |
c14c6fd5 AK |
172 | put_bh(bh); |
173 | return retval; | |
174 | ||
175 | } | |
176 | ||
177 | static int update_tind_extent_range(handle_t *handle, struct inode *inode, | |
fba90ffe DM |
178 | ext4_fsblk_t pblock, |
179 | struct migrate_struct *lb) | |
c14c6fd5 AK |
180 | { |
181 | struct buffer_head *bh; | |
182 | __le32 *i_data; | |
183 | int i, retval = 0; | |
c14c6fd5 AK |
184 | unsigned long max_entries = inode->i_sb->s_blocksize >> 2; |
185 | ||
c14c6fd5 AK |
186 | bh = sb_bread(inode->i_sb, pblock); |
187 | if (!bh) | |
188 | return -EIO; | |
189 | ||
190 | i_data = (__le32 *)bh->b_data; | |
191 | for (i = 0; i < max_entries; i++) { | |
192 | if (i_data[i]) { | |
193 | retval = update_dind_extent_range(handle, inode, | |
fba90ffe | 194 | le32_to_cpu(i_data[i]), lb); |
c14c6fd5 AK |
195 | if (retval) |
196 | break; | |
fba90ffe | 197 | } else { |
c14c6fd5 | 198 | /* Only update the file block number */ |
fba90ffe DM |
199 | lb->curr_block += max_entries * max_entries; |
200 | } | |
c14c6fd5 | 201 | } |
c14c6fd5 AK |
202 | put_bh(bh); |
203 | return retval; | |
204 | ||
205 | } | |
206 | ||
8009f9fb AK |
207 | static int extend_credit_for_blkdel(handle_t *handle, struct inode *inode) |
208 | { | |
209 | int retval = 0, needed; | |
210 | ||
0390131b | 211 | if (ext4_handle_has_enough_credits(handle, EXT4_RESERVE_TRANS_BLOCKS+1)) |
8009f9fb AK |
212 | return 0; |
213 | /* | |
214 | * We are freeing a blocks. During this we touch | |
215 | * superblock, group descriptor and block bitmap. | |
216 | * So allocate a credit of 3. We may update | |
217 | * quota (user and group). | |
218 | */ | |
5aca07eb | 219 | needed = 3 + EXT4_MAXQUOTAS_TRANS_BLOCKS(inode->i_sb); |
8009f9fb AK |
220 | |
221 | if (ext4_journal_extend(handle, needed) != 0) | |
222 | retval = ext4_journal_restart(handle, needed); | |
223 | ||
224 | return retval; | |
225 | } | |
226 | ||
c14c6fd5 AK |
227 | static int free_dind_blocks(handle_t *handle, |
228 | struct inode *inode, __le32 i_data) | |
229 | { | |
230 | int i; | |
231 | __le32 *tmp_idata; | |
232 | struct buffer_head *bh; | |
233 | unsigned long max_entries = inode->i_sb->s_blocksize >> 2; | |
234 | ||
235 | bh = sb_bread(inode->i_sb, le32_to_cpu(i_data)); | |
236 | if (!bh) | |
237 | return -EIO; | |
238 | ||
239 | tmp_idata = (__le32 *)bh->b_data; | |
240 | for (i = 0; i < max_entries; i++) { | |
8009f9fb AK |
241 | if (tmp_idata[i]) { |
242 | extend_credit_for_blkdel(handle, inode); | |
7dc57615 | 243 | ext4_free_blocks(handle, inode, NULL, |
e6362609 TT |
244 | le32_to_cpu(tmp_idata[i]), 1, |
245 | EXT4_FREE_BLOCKS_METADATA | | |
246 | EXT4_FREE_BLOCKS_FORGET); | |
8009f9fb | 247 | } |
c14c6fd5 AK |
248 | } |
249 | put_bh(bh); | |
8009f9fb | 250 | extend_credit_for_blkdel(handle, inode); |
7dc57615 | 251 | ext4_free_blocks(handle, inode, NULL, le32_to_cpu(i_data), 1, |
e6362609 TT |
252 | EXT4_FREE_BLOCKS_METADATA | |
253 | EXT4_FREE_BLOCKS_FORGET); | |
c14c6fd5 AK |
254 | return 0; |
255 | } | |
256 | ||
257 | static int free_tind_blocks(handle_t *handle, | |
258 | struct inode *inode, __le32 i_data) | |
259 | { | |
260 | int i, retval = 0; | |
261 | __le32 *tmp_idata; | |
262 | struct buffer_head *bh; | |
263 | unsigned long max_entries = inode->i_sb->s_blocksize >> 2; | |
264 | ||
265 | bh = sb_bread(inode->i_sb, le32_to_cpu(i_data)); | |
266 | if (!bh) | |
267 | return -EIO; | |
268 | ||
269 | tmp_idata = (__le32 *)bh->b_data; | |
270 | for (i = 0; i < max_entries; i++) { | |
271 | if (tmp_idata[i]) { | |
272 | retval = free_dind_blocks(handle, | |
273 | inode, tmp_idata[i]); | |
274 | if (retval) { | |
275 | put_bh(bh); | |
276 | return retval; | |
277 | } | |
278 | } | |
279 | } | |
280 | put_bh(bh); | |
8009f9fb | 281 | extend_credit_for_blkdel(handle, inode); |
7dc57615 | 282 | ext4_free_blocks(handle, inode, NULL, le32_to_cpu(i_data), 1, |
e6362609 TT |
283 | EXT4_FREE_BLOCKS_METADATA | |
284 | EXT4_FREE_BLOCKS_FORGET); | |
c14c6fd5 AK |
285 | return 0; |
286 | } | |
287 | ||
8009f9fb | 288 | static int free_ind_block(handle_t *handle, struct inode *inode, __le32 *i_data) |
c14c6fd5 AK |
289 | { |
290 | int retval; | |
c14c6fd5 | 291 | |
8009f9fb AK |
292 | /* ei->i_data[EXT4_IND_BLOCK] */ |
293 | if (i_data[0]) { | |
294 | extend_credit_for_blkdel(handle, inode); | |
7dc57615 | 295 | ext4_free_blocks(handle, inode, NULL, |
e6362609 TT |
296 | le32_to_cpu(i_data[0]), 1, |
297 | EXT4_FREE_BLOCKS_METADATA | | |
298 | EXT4_FREE_BLOCKS_FORGET); | |
8009f9fb | 299 | } |
c14c6fd5 | 300 | |
8009f9fb AK |
301 | /* ei->i_data[EXT4_DIND_BLOCK] */ |
302 | if (i_data[1]) { | |
303 | retval = free_dind_blocks(handle, inode, i_data[1]); | |
c14c6fd5 AK |
304 | if (retval) |
305 | return retval; | |
306 | } | |
307 | ||
8009f9fb AK |
308 | /* ei->i_data[EXT4_TIND_BLOCK] */ |
309 | if (i_data[2]) { | |
310 | retval = free_tind_blocks(handle, inode, i_data[2]); | |
c14c6fd5 AK |
311 | if (retval) |
312 | return retval; | |
313 | } | |
314 | return 0; | |
315 | } | |
316 | ||
317 | static int ext4_ext_swap_inode_data(handle_t *handle, struct inode *inode, | |
267e4db9 | 318 | struct inode *tmp_inode) |
c14c6fd5 | 319 | { |
8009f9fb AK |
320 | int retval; |
321 | __le32 i_data[3]; | |
c14c6fd5 AK |
322 | struct ext4_inode_info *ei = EXT4_I(inode); |
323 | struct ext4_inode_info *tmp_ei = EXT4_I(tmp_inode); | |
324 | ||
c14c6fd5 AK |
325 | /* |
326 | * One credit accounted for writing the | |
327 | * i_data field of the original inode | |
328 | */ | |
329 | retval = ext4_journal_extend(handle, 1); | |
267e4db9 | 330 | if (retval) { |
c14c6fd5 AK |
331 | retval = ext4_journal_restart(handle, 1); |
332 | if (retval) | |
333 | goto err_out; | |
334 | } | |
335 | ||
8009f9fb AK |
336 | i_data[0] = ei->i_data[EXT4_IND_BLOCK]; |
337 | i_data[1] = ei->i_data[EXT4_DIND_BLOCK]; | |
338 | i_data[2] = ei->i_data[EXT4_TIND_BLOCK]; | |
339 | ||
340 | down_write(&EXT4_I(inode)->i_data_sem); | |
267e4db9 | 341 | /* |
1b9c12f4 | 342 | * if EXT4_STATE_EXT_MIGRATE is cleared a block allocation |
267e4db9 AK |
343 | * happened after we started the migrate. We need to |
344 | * fail the migrate | |
345 | */ | |
19f5fb7a | 346 | if (!ext4_test_inode_state(inode, EXT4_STATE_EXT_MIGRATE)) { |
267e4db9 AK |
347 | retval = -EAGAIN; |
348 | up_write(&EXT4_I(inode)->i_data_sem); | |
349 | goto err_out; | |
350 | } else | |
19f5fb7a | 351 | ext4_clear_inode_state(inode, EXT4_STATE_EXT_MIGRATE); |
c14c6fd5 AK |
352 | /* |
353 | * We have the extent map build with the tmp inode. | |
354 | * Now copy the i_data across | |
355 | */ | |
74e4e6db | 356 | ext4_set_inode_flag(inode, EXT4_INODE_EXTENTS); |
c14c6fd5 AK |
357 | memcpy(ei->i_data, tmp_ei->i_data, sizeof(ei->i_data)); |
358 | ||
359 | /* | |
360 | * Update i_blocks with the new blocks that got | |
361 | * allocated while adding extents for extent index | |
362 | * blocks. | |
363 | * | |
364 | * While converting to extents we need not | |
365 | * update the orignal inode i_blocks for extent blocks | |
366 | * via quota APIs. The quota update happened via tmp_inode already. | |
367 | */ | |
368 | spin_lock(&inode->i_lock); | |
369 | inode->i_blocks += tmp_inode->i_blocks; | |
370 | spin_unlock(&inode->i_lock); | |
8009f9fb | 371 | up_write(&EXT4_I(inode)->i_data_sem); |
c14c6fd5 | 372 | |
8009f9fb AK |
373 | /* |
374 | * We mark the inode dirty after, because we decrement the | |
375 | * i_blocks when freeing the indirect meta-data blocks | |
376 | */ | |
377 | retval = free_ind_block(handle, inode, i_data); | |
c14c6fd5 | 378 | ext4_mark_inode_dirty(handle, inode); |
8009f9fb | 379 | |
c14c6fd5 AK |
380 | err_out: |
381 | return retval; | |
382 | } | |
383 | ||
384 | static int free_ext_idx(handle_t *handle, struct inode *inode, | |
385 | struct ext4_extent_idx *ix) | |
386 | { | |
387 | int i, retval = 0; | |
388 | ext4_fsblk_t block; | |
389 | struct buffer_head *bh; | |
390 | struct ext4_extent_header *eh; | |
391 | ||
bf89d16f | 392 | block = ext4_idx_pblock(ix); |
c14c6fd5 AK |
393 | bh = sb_bread(inode->i_sb, block); |
394 | if (!bh) | |
395 | return -EIO; | |
396 | ||
397 | eh = (struct ext4_extent_header *)bh->b_data; | |
398 | if (eh->eh_depth != 0) { | |
399 | ix = EXT_FIRST_INDEX(eh); | |
400 | for (i = 0; i < le16_to_cpu(eh->eh_entries); i++, ix++) { | |
401 | retval = free_ext_idx(handle, inode, ix); | |
402 | if (retval) | |
403 | break; | |
404 | } | |
405 | } | |
406 | put_bh(bh); | |
8009f9fb | 407 | extend_credit_for_blkdel(handle, inode); |
7dc57615 | 408 | ext4_free_blocks(handle, inode, NULL, block, 1, |
e6362609 | 409 | EXT4_FREE_BLOCKS_METADATA | EXT4_FREE_BLOCKS_FORGET); |
c14c6fd5 AK |
410 | return retval; |
411 | } | |
412 | ||
413 | /* | |
414 | * Free the extent meta data blocks only | |
415 | */ | |
416 | static int free_ext_block(handle_t *handle, struct inode *inode) | |
417 | { | |
418 | int i, retval = 0; | |
419 | struct ext4_inode_info *ei = EXT4_I(inode); | |
420 | struct ext4_extent_header *eh = (struct ext4_extent_header *)ei->i_data; | |
421 | struct ext4_extent_idx *ix; | |
422 | if (eh->eh_depth == 0) | |
423 | /* | |
424 | * No extra blocks allocated for extent meta data | |
425 | */ | |
426 | return 0; | |
427 | ix = EXT_FIRST_INDEX(eh); | |
428 | for (i = 0; i < le16_to_cpu(eh->eh_entries); i++, ix++) { | |
429 | retval = free_ext_idx(handle, inode, ix); | |
430 | if (retval) | |
431 | return retval; | |
432 | } | |
433 | return retval; | |
c14c6fd5 AK |
434 | } |
435 | ||
2a43a878 | 436 | int ext4_ext_migrate(struct inode *inode) |
c14c6fd5 AK |
437 | { |
438 | handle_t *handle; | |
439 | int retval = 0, i; | |
440 | __le32 *i_data; | |
c14c6fd5 AK |
441 | struct ext4_inode_info *ei; |
442 | struct inode *tmp_inode = NULL; | |
fba90ffe | 443 | struct migrate_struct lb; |
c14c6fd5 | 444 | unsigned long max_entries; |
11013911 | 445 | __u32 goal; |
5cb81dab | 446 | uid_t owner[2]; |
c14c6fd5 | 447 | |
83982b6f TT |
448 | /* |
449 | * If the filesystem does not support extents, or the inode | |
450 | * already is extent-based, error out. | |
451 | */ | |
452 | if (!EXT4_HAS_INCOMPAT_FEATURE(inode->i_sb, | |
453 | EXT4_FEATURE_INCOMPAT_EXTENTS) || | |
12e9b892 | 454 | (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) |
c14c6fd5 AK |
455 | return -EINVAL; |
456 | ||
b8356c46 VC |
457 | if (S_ISLNK(inode->i_mode) && inode->i_blocks == 0) |
458 | /* | |
459 | * don't migrate fast symlink | |
460 | */ | |
461 | return retval; | |
462 | ||
4b217630 TT |
463 | /* |
464 | * Worst case we can touch the allocation bitmaps, a bgd | |
465 | * block, and a block to link in the orphan list. We do need | |
466 | * need to worry about credits for modifying the quota inode. | |
467 | */ | |
9924a92a | 468 | handle = ext4_journal_start(inode, EXT4_HT_MIGRATE, |
4b217630 TT |
469 | 4 + EXT4_MAXQUOTAS_TRANS_BLOCKS(inode->i_sb)); |
470 | ||
c14c6fd5 AK |
471 | if (IS_ERR(handle)) { |
472 | retval = PTR_ERR(handle); | |
09054264 | 473 | return retval; |
c14c6fd5 | 474 | } |
11013911 AD |
475 | goal = (((inode->i_ino - 1) / EXT4_INODES_PER_GROUP(inode->i_sb)) * |
476 | EXT4_INODES_PER_GROUP(inode->i_sb)) + 1; | |
08cefc7a EB |
477 | owner[0] = i_uid_read(inode); |
478 | owner[1] = i_gid_read(inode); | |
f157a4aa | 479 | tmp_inode = ext4_new_inode(handle, inode->i_sb->s_root->d_inode, |
5cb81dab | 480 | S_IFREG, NULL, goal, owner); |
c14c6fd5 | 481 | if (IS_ERR(tmp_inode)) { |
a0cc910f | 482 | retval = PTR_ERR(tmp_inode); |
c14c6fd5 | 483 | ext4_journal_stop(handle); |
09054264 | 484 | return retval; |
c14c6fd5 AK |
485 | } |
486 | i_size_write(tmp_inode, i_size_read(inode)); | |
487 | /* | |
f39490bc DM |
488 | * Set the i_nlink to zero so it will be deleted later |
489 | * when we drop inode reference. | |
c14c6fd5 | 490 | */ |
6d6b77f1 | 491 | clear_nlink(tmp_inode); |
c14c6fd5 AK |
492 | |
493 | ext4_ext_tree_init(handle, tmp_inode); | |
494 | ext4_orphan_add(handle, tmp_inode); | |
495 | ext4_journal_stop(handle); | |
496 | ||
c14c6fd5 AK |
497 | /* |
498 | * start with one credit accounted for | |
499 | * superblock modification. | |
500 | * | |
25985edc | 501 | * For the tmp_inode we already have committed the |
70261f56 | 502 | * transaction that created the inode. Later as and |
c14c6fd5 AK |
503 | * when we add extents we extent the journal |
504 | */ | |
267e4db9 | 505 | /* |
1b9c12f4 TT |
506 | * Even though we take i_mutex we can still cause block |
507 | * allocation via mmap write to holes. If we have allocated | |
508 | * new blocks we fail migrate. New block allocation will | |
509 | * clear EXT4_STATE_EXT_MIGRATE flag. The flag is updated | |
510 | * with i_data_sem held to prevent racing with block | |
511 | * allocation. | |
267e4db9 | 512 | */ |
c8b459f4 | 513 | down_read(&EXT4_I(inode)->i_data_sem); |
19f5fb7a | 514 | ext4_set_inode_state(inode, EXT4_STATE_EXT_MIGRATE); |
267e4db9 AK |
515 | up_read((&EXT4_I(inode)->i_data_sem)); |
516 | ||
9924a92a | 517 | handle = ext4_journal_start(inode, EXT4_HT_MIGRATE, 1); |
f39490bc DM |
518 | if (IS_ERR(handle)) { |
519 | /* | |
520 | * It is impossible to update on-disk structures without | |
521 | * a handle, so just rollback in-core changes and live other | |
522 | * work to orphan_list_cleanup() | |
523 | */ | |
524 | ext4_orphan_del(NULL, tmp_inode); | |
525 | retval = PTR_ERR(handle); | |
526 | goto out; | |
527 | } | |
8009f9fb AK |
528 | |
529 | ei = EXT4_I(inode); | |
530 | i_data = ei->i_data; | |
531 | memset(&lb, 0, sizeof(lb)); | |
532 | ||
533 | /* 32 bit block address 4 bytes */ | |
534 | max_entries = inode->i_sb->s_blocksize >> 2; | |
fba90ffe | 535 | for (i = 0; i < EXT4_NDIR_BLOCKS; i++) { |
c14c6fd5 AK |
536 | if (i_data[i]) { |
537 | retval = update_extent_range(handle, tmp_inode, | |
fba90ffe | 538 | le32_to_cpu(i_data[i]), &lb); |
c14c6fd5 AK |
539 | if (retval) |
540 | goto err_out; | |
fba90ffe DM |
541 | } else |
542 | lb.curr_block++; | |
c14c6fd5 AK |
543 | } |
544 | if (i_data[EXT4_IND_BLOCK]) { | |
545 | retval = update_ind_extent_range(handle, tmp_inode, | |
fba90ffe | 546 | le32_to_cpu(i_data[EXT4_IND_BLOCK]), &lb); |
c14c6fd5 AK |
547 | if (retval) |
548 | goto err_out; | |
549 | } else | |
fba90ffe | 550 | lb.curr_block += max_entries; |
c14c6fd5 AK |
551 | if (i_data[EXT4_DIND_BLOCK]) { |
552 | retval = update_dind_extent_range(handle, tmp_inode, | |
fba90ffe | 553 | le32_to_cpu(i_data[EXT4_DIND_BLOCK]), &lb); |
c14c6fd5 AK |
554 | if (retval) |
555 | goto err_out; | |
556 | } else | |
fba90ffe | 557 | lb.curr_block += max_entries * max_entries; |
c14c6fd5 AK |
558 | if (i_data[EXT4_TIND_BLOCK]) { |
559 | retval = update_tind_extent_range(handle, tmp_inode, | |
fba90ffe | 560 | le32_to_cpu(i_data[EXT4_TIND_BLOCK]), &lb); |
c14c6fd5 AK |
561 | if (retval) |
562 | goto err_out; | |
563 | } | |
564 | /* | |
565 | * Build the last extent | |
566 | */ | |
567 | retval = finish_range(handle, tmp_inode, &lb); | |
568 | err_out: | |
c14c6fd5 AK |
569 | if (retval) |
570 | /* | |
571 | * Failure case delete the extent information with the | |
572 | * tmp_inode | |
573 | */ | |
574 | free_ext_block(handle, tmp_inode); | |
267e4db9 AK |
575 | else { |
576 | retval = ext4_ext_swap_inode_data(handle, inode, tmp_inode); | |
577 | if (retval) | |
578 | /* | |
579 | * if we fail to swap inode data free the extent | |
580 | * details of the tmp inode | |
581 | */ | |
582 | free_ext_block(handle, tmp_inode); | |
583 | } | |
8009f9fb AK |
584 | |
585 | /* We mark the tmp_inode dirty via ext4_ext_tree_init. */ | |
586 | if (ext4_journal_extend(handle, 1) != 0) | |
587 | ext4_journal_restart(handle, 1); | |
c14c6fd5 AK |
588 | |
589 | /* | |
590 | * Mark the tmp_inode as of size zero | |
591 | */ | |
592 | i_size_write(tmp_inode, 0); | |
593 | ||
594 | /* | |
595 | * set the i_blocks count to zero | |
596 | * so that the ext4_delete_inode does the | |
597 | * right job | |
598 | * | |
599 | * We don't need to take the i_lock because | |
600 | * the inode is not visible to user space. | |
601 | */ | |
602 | tmp_inode->i_blocks = 0; | |
603 | ||
604 | /* Reset the extent details */ | |
605 | ext4_ext_tree_init(handle, tmp_inode); | |
c14c6fd5 | 606 | ext4_journal_stop(handle); |
f39490bc | 607 | out: |
a8526e84 | 608 | unlock_new_inode(tmp_inode); |
09054264 | 609 | iput(tmp_inode); |
c14c6fd5 AK |
610 | |
611 | return retval; | |
612 | } | |
0d14b098 LC |
613 | |
614 | /* | |
615 | * Migrate a simple extent-based inode to use the i_blocks[] array | |
616 | */ | |
617 | int ext4_ind_migrate(struct inode *inode) | |
618 | { | |
619 | struct ext4_extent_header *eh; | |
620 | struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es; | |
621 | struct ext4_inode_info *ei = EXT4_I(inode); | |
622 | struct ext4_extent *ex; | |
623 | unsigned int i, len; | |
624 | ext4_fsblk_t blk; | |
625 | handle_t *handle; | |
626 | int ret; | |
627 | ||
628 | if (!EXT4_HAS_INCOMPAT_FEATURE(inode->i_sb, | |
629 | EXT4_FEATURE_INCOMPAT_EXTENTS) || | |
630 | (!ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) | |
631 | return -EINVAL; | |
632 | ||
43e50f50 LC |
633 | if (EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb, |
634 | EXT4_FEATURE_RO_COMPAT_BIGALLOC)) | |
635 | return -EOPNOTSUPP; | |
636 | ||
0d14b098 LC |
637 | handle = ext4_journal_start(inode, EXT4_HT_MIGRATE, 1); |
638 | if (IS_ERR(handle)) | |
639 | return PTR_ERR(handle); | |
640 | ||
641 | down_write(&EXT4_I(inode)->i_data_sem); | |
642 | ret = ext4_ext_check_inode(inode); | |
643 | if (ret) | |
644 | goto errout; | |
645 | ||
646 | eh = ext_inode_hdr(inode); | |
647 | ex = EXT_FIRST_EXTENT(eh); | |
648 | if (ext4_blocks_count(es) > EXT4_MAX_BLOCK_FILE_PHYS || | |
649 | eh->eh_depth != 0 || le16_to_cpu(eh->eh_entries) > 1) { | |
650 | ret = -EOPNOTSUPP; | |
651 | goto errout; | |
652 | } | |
653 | if (eh->eh_entries == 0) | |
654 | blk = len = 0; | |
655 | else { | |
656 | len = le16_to_cpu(ex->ee_len); | |
657 | blk = ext4_ext_pblock(ex); | |
658 | if (len > EXT4_NDIR_BLOCKS) { | |
659 | ret = -EOPNOTSUPP; | |
660 | goto errout; | |
661 | } | |
662 | } | |
663 | ||
664 | ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS); | |
665 | memset(ei->i_data, 0, sizeof(ei->i_data)); | |
666 | for (i=0; i < len; i++) | |
667 | ei->i_data[i] = cpu_to_le32(blk++); | |
668 | ext4_mark_inode_dirty(handle, inode); | |
669 | errout: | |
670 | ext4_journal_stop(handle); | |
671 | up_write(&EXT4_I(inode)->i_data_sem); | |
672 | return ret; | |
673 | } |