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f2c870e3 TM |
1 | /* -*- mode: c; c-basic-offset: 8; -*- |
2 | * vim: noexpandtab sw=8 ts=8 sts=0: | |
3 | * | |
4 | * refcounttree.c | |
5 | * | |
6 | * Copyright (C) 2009 Oracle. All rights reserved. | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU General Public | |
10 | * License version 2 as published by the Free Software Foundation. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | * General Public License for more details. | |
16 | */ | |
17 | ||
e73a819d | 18 | #include <linux/sort.h> |
f2c870e3 TM |
19 | #define MLOG_MASK_PREFIX ML_REFCOUNT |
20 | #include <cluster/masklog.h> | |
21 | #include "ocfs2.h" | |
22 | #include "inode.h" | |
23 | #include "alloc.h" | |
24 | #include "suballoc.h" | |
25 | #include "journal.h" | |
26 | #include "uptodate.h" | |
27 | #include "super.h" | |
28 | #include "buffer_head_io.h" | |
29 | #include "blockcheck.h" | |
c732eb16 | 30 | #include "refcounttree.h" |
8bf396de | 31 | #include "sysfile.h" |
374a263e | 32 | #include "dlmglue.h" |
e73a819d | 33 | #include "extent_map.h" |
6f70fa51 | 34 | #include "aops.h" |
492a8a33 | 35 | #include "xattr.h" |
09bf27a0 | 36 | #include "namei.h" |
6f70fa51 TM |
37 | |
38 | #include <linux/bio.h> | |
39 | #include <linux/blkdev.h> | |
40 | #include <linux/gfp.h> | |
41 | #include <linux/slab.h> | |
42 | #include <linux/writeback.h> | |
43 | #include <linux/pagevec.h> | |
44 | #include <linux/swap.h> | |
bd50873d TM |
45 | #include <linux/security.h> |
46 | #include <linux/fsnotify.h> | |
47 | #include <linux/quotaops.h> | |
48 | #include <linux/namei.h> | |
49 | #include <linux/mount.h> | |
6f70fa51 TM |
50 | |
51 | struct ocfs2_cow_context { | |
52 | struct inode *inode; | |
53 | u32 cow_start; | |
54 | u32 cow_len; | |
913580b4 TM |
55 | struct ocfs2_extent_tree data_et; |
56 | struct ocfs2_refcount_tree *ref_tree; | |
6f70fa51 TM |
57 | struct buffer_head *ref_root_bh; |
58 | struct ocfs2_alloc_context *meta_ac; | |
59 | struct ocfs2_alloc_context *data_ac; | |
60 | struct ocfs2_cached_dealloc_ctxt dealloc; | |
492a8a33 TM |
61 | void *cow_object; |
62 | struct ocfs2_post_refcount *post_refcount; | |
63 | int extra_credits; | |
913580b4 TM |
64 | int (*get_clusters)(struct ocfs2_cow_context *context, |
65 | u32 v_cluster, u32 *p_cluster, | |
66 | u32 *num_clusters, | |
67 | unsigned int *extent_flags); | |
68 | int (*cow_duplicate_clusters)(handle_t *handle, | |
69 | struct ocfs2_cow_context *context, | |
70 | u32 cpos, u32 old_cluster, | |
71 | u32 new_cluster, u32 new_len); | |
6f70fa51 | 72 | }; |
c732eb16 TM |
73 | |
74 | static inline struct ocfs2_refcount_tree * | |
75 | cache_info_to_refcount(struct ocfs2_caching_info *ci) | |
76 | { | |
77 | return container_of(ci, struct ocfs2_refcount_tree, rf_ci); | |
78 | } | |
f2c870e3 TM |
79 | |
80 | static int ocfs2_validate_refcount_block(struct super_block *sb, | |
81 | struct buffer_head *bh) | |
82 | { | |
83 | int rc; | |
84 | struct ocfs2_refcount_block *rb = | |
85 | (struct ocfs2_refcount_block *)bh->b_data; | |
86 | ||
87 | mlog(0, "Validating refcount block %llu\n", | |
88 | (unsigned long long)bh->b_blocknr); | |
89 | ||
90 | BUG_ON(!buffer_uptodate(bh)); | |
91 | ||
92 | /* | |
93 | * If the ecc fails, we return the error but otherwise | |
94 | * leave the filesystem running. We know any error is | |
95 | * local to this block. | |
96 | */ | |
97 | rc = ocfs2_validate_meta_ecc(sb, bh->b_data, &rb->rf_check); | |
98 | if (rc) { | |
99 | mlog(ML_ERROR, "Checksum failed for refcount block %llu\n", | |
100 | (unsigned long long)bh->b_blocknr); | |
101 | return rc; | |
102 | } | |
103 | ||
104 | ||
105 | if (!OCFS2_IS_VALID_REFCOUNT_BLOCK(rb)) { | |
106 | ocfs2_error(sb, | |
107 | "Refcount block #%llu has bad signature %.*s", | |
108 | (unsigned long long)bh->b_blocknr, 7, | |
109 | rb->rf_signature); | |
110 | return -EINVAL; | |
111 | } | |
112 | ||
113 | if (le64_to_cpu(rb->rf_blkno) != bh->b_blocknr) { | |
114 | ocfs2_error(sb, | |
115 | "Refcount block #%llu has an invalid rf_blkno " | |
116 | "of %llu", | |
117 | (unsigned long long)bh->b_blocknr, | |
118 | (unsigned long long)le64_to_cpu(rb->rf_blkno)); | |
119 | return -EINVAL; | |
120 | } | |
121 | ||
122 | if (le32_to_cpu(rb->rf_fs_generation) != OCFS2_SB(sb)->fs_generation) { | |
123 | ocfs2_error(sb, | |
124 | "Refcount block #%llu has an invalid " | |
125 | "rf_fs_generation of #%u", | |
126 | (unsigned long long)bh->b_blocknr, | |
127 | le32_to_cpu(rb->rf_fs_generation)); | |
128 | return -EINVAL; | |
129 | } | |
130 | ||
131 | return 0; | |
132 | } | |
133 | ||
134 | static int ocfs2_read_refcount_block(struct ocfs2_caching_info *ci, | |
135 | u64 rb_blkno, | |
136 | struct buffer_head **bh) | |
137 | { | |
138 | int rc; | |
139 | struct buffer_head *tmp = *bh; | |
140 | ||
141 | rc = ocfs2_read_block(ci, rb_blkno, &tmp, | |
142 | ocfs2_validate_refcount_block); | |
143 | ||
144 | /* If ocfs2_read_block() got us a new bh, pass it up. */ | |
145 | if (!rc && !*bh) | |
146 | *bh = tmp; | |
147 | ||
148 | return rc; | |
149 | } | |
c732eb16 TM |
150 | |
151 | static u64 ocfs2_refcount_cache_owner(struct ocfs2_caching_info *ci) | |
152 | { | |
153 | struct ocfs2_refcount_tree *rf = cache_info_to_refcount(ci); | |
154 | ||
155 | return rf->rf_blkno; | |
156 | } | |
157 | ||
158 | static struct super_block * | |
159 | ocfs2_refcount_cache_get_super(struct ocfs2_caching_info *ci) | |
160 | { | |
161 | struct ocfs2_refcount_tree *rf = cache_info_to_refcount(ci); | |
162 | ||
163 | return rf->rf_sb; | |
164 | } | |
165 | ||
166 | static void ocfs2_refcount_cache_lock(struct ocfs2_caching_info *ci) | |
167 | { | |
168 | struct ocfs2_refcount_tree *rf = cache_info_to_refcount(ci); | |
169 | ||
170 | spin_lock(&rf->rf_lock); | |
171 | } | |
172 | ||
173 | static void ocfs2_refcount_cache_unlock(struct ocfs2_caching_info *ci) | |
174 | { | |
175 | struct ocfs2_refcount_tree *rf = cache_info_to_refcount(ci); | |
176 | ||
177 | spin_unlock(&rf->rf_lock); | |
178 | } | |
179 | ||
180 | static void ocfs2_refcount_cache_io_lock(struct ocfs2_caching_info *ci) | |
181 | { | |
182 | struct ocfs2_refcount_tree *rf = cache_info_to_refcount(ci); | |
183 | ||
184 | mutex_lock(&rf->rf_io_mutex); | |
185 | } | |
186 | ||
187 | static void ocfs2_refcount_cache_io_unlock(struct ocfs2_caching_info *ci) | |
188 | { | |
189 | struct ocfs2_refcount_tree *rf = cache_info_to_refcount(ci); | |
190 | ||
191 | mutex_unlock(&rf->rf_io_mutex); | |
192 | } | |
193 | ||
194 | static const struct ocfs2_caching_operations ocfs2_refcount_caching_ops = { | |
195 | .co_owner = ocfs2_refcount_cache_owner, | |
196 | .co_get_super = ocfs2_refcount_cache_get_super, | |
197 | .co_cache_lock = ocfs2_refcount_cache_lock, | |
198 | .co_cache_unlock = ocfs2_refcount_cache_unlock, | |
199 | .co_io_lock = ocfs2_refcount_cache_io_lock, | |
200 | .co_io_unlock = ocfs2_refcount_cache_io_unlock, | |
201 | }; | |
374a263e TM |
202 | |
203 | static struct ocfs2_refcount_tree * | |
204 | ocfs2_find_refcount_tree(struct ocfs2_super *osb, u64 blkno) | |
205 | { | |
206 | struct rb_node *n = osb->osb_rf_lock_tree.rb_node; | |
207 | struct ocfs2_refcount_tree *tree = NULL; | |
208 | ||
209 | while (n) { | |
210 | tree = rb_entry(n, struct ocfs2_refcount_tree, rf_node); | |
211 | ||
212 | if (blkno < tree->rf_blkno) | |
213 | n = n->rb_left; | |
214 | else if (blkno > tree->rf_blkno) | |
215 | n = n->rb_right; | |
216 | else | |
217 | return tree; | |
218 | } | |
219 | ||
220 | return NULL; | |
221 | } | |
222 | ||
223 | /* osb_lock is already locked. */ | |
224 | static void ocfs2_insert_refcount_tree(struct ocfs2_super *osb, | |
225 | struct ocfs2_refcount_tree *new) | |
226 | { | |
227 | u64 rf_blkno = new->rf_blkno; | |
228 | struct rb_node *parent = NULL; | |
229 | struct rb_node **p = &osb->osb_rf_lock_tree.rb_node; | |
230 | struct ocfs2_refcount_tree *tmp; | |
231 | ||
232 | while (*p) { | |
233 | parent = *p; | |
234 | ||
235 | tmp = rb_entry(parent, struct ocfs2_refcount_tree, | |
236 | rf_node); | |
237 | ||
238 | if (rf_blkno < tmp->rf_blkno) | |
239 | p = &(*p)->rb_left; | |
240 | else if (rf_blkno > tmp->rf_blkno) | |
241 | p = &(*p)->rb_right; | |
242 | else { | |
243 | /* This should never happen! */ | |
244 | mlog(ML_ERROR, "Duplicate refcount block %llu found!\n", | |
245 | (unsigned long long)rf_blkno); | |
246 | BUG(); | |
247 | } | |
248 | } | |
249 | ||
250 | rb_link_node(&new->rf_node, parent, p); | |
251 | rb_insert_color(&new->rf_node, &osb->osb_rf_lock_tree); | |
252 | } | |
253 | ||
254 | static void ocfs2_free_refcount_tree(struct ocfs2_refcount_tree *tree) | |
255 | { | |
256 | ocfs2_metadata_cache_exit(&tree->rf_ci); | |
257 | ocfs2_simple_drop_lockres(OCFS2_SB(tree->rf_sb), &tree->rf_lockres); | |
258 | ocfs2_lock_res_free(&tree->rf_lockres); | |
259 | kfree(tree); | |
260 | } | |
261 | ||
262 | static inline void | |
263 | ocfs2_erase_refcount_tree_from_list_no_lock(struct ocfs2_super *osb, | |
264 | struct ocfs2_refcount_tree *tree) | |
265 | { | |
266 | rb_erase(&tree->rf_node, &osb->osb_rf_lock_tree); | |
267 | if (osb->osb_ref_tree_lru && osb->osb_ref_tree_lru == tree) | |
268 | osb->osb_ref_tree_lru = NULL; | |
269 | } | |
270 | ||
271 | static void ocfs2_erase_refcount_tree_from_list(struct ocfs2_super *osb, | |
272 | struct ocfs2_refcount_tree *tree) | |
273 | { | |
274 | spin_lock(&osb->osb_lock); | |
275 | ocfs2_erase_refcount_tree_from_list_no_lock(osb, tree); | |
276 | spin_unlock(&osb->osb_lock); | |
277 | } | |
278 | ||
279 | void ocfs2_kref_remove_refcount_tree(struct kref *kref) | |
280 | { | |
281 | struct ocfs2_refcount_tree *tree = | |
282 | container_of(kref, struct ocfs2_refcount_tree, rf_getcnt); | |
283 | ||
284 | ocfs2_free_refcount_tree(tree); | |
285 | } | |
286 | ||
287 | static inline void | |
288 | ocfs2_refcount_tree_get(struct ocfs2_refcount_tree *tree) | |
289 | { | |
290 | kref_get(&tree->rf_getcnt); | |
291 | } | |
292 | ||
293 | static inline void | |
294 | ocfs2_refcount_tree_put(struct ocfs2_refcount_tree *tree) | |
295 | { | |
296 | kref_put(&tree->rf_getcnt, ocfs2_kref_remove_refcount_tree); | |
297 | } | |
298 | ||
299 | static inline void ocfs2_init_refcount_tree_ci(struct ocfs2_refcount_tree *new, | |
300 | struct super_block *sb) | |
301 | { | |
302 | ocfs2_metadata_cache_init(&new->rf_ci, &ocfs2_refcount_caching_ops); | |
303 | mutex_init(&new->rf_io_mutex); | |
304 | new->rf_sb = sb; | |
305 | spin_lock_init(&new->rf_lock); | |
306 | } | |
307 | ||
308 | static inline void ocfs2_init_refcount_tree_lock(struct ocfs2_super *osb, | |
309 | struct ocfs2_refcount_tree *new, | |
310 | u64 rf_blkno, u32 generation) | |
311 | { | |
312 | init_rwsem(&new->rf_sem); | |
313 | ocfs2_refcount_lock_res_init(&new->rf_lockres, osb, | |
314 | rf_blkno, generation); | |
315 | } | |
316 | ||
8bf396de TM |
317 | static struct ocfs2_refcount_tree* |
318 | ocfs2_allocate_refcount_tree(struct ocfs2_super *osb, u64 rf_blkno) | |
319 | { | |
320 | struct ocfs2_refcount_tree *new; | |
321 | ||
322 | new = kzalloc(sizeof(struct ocfs2_refcount_tree), GFP_NOFS); | |
323 | if (!new) | |
324 | return NULL; | |
325 | ||
326 | new->rf_blkno = rf_blkno; | |
327 | kref_init(&new->rf_getcnt); | |
328 | ocfs2_init_refcount_tree_ci(new, osb->sb); | |
329 | ||
330 | return new; | |
331 | } | |
332 | ||
374a263e TM |
333 | static int ocfs2_get_refcount_tree(struct ocfs2_super *osb, u64 rf_blkno, |
334 | struct ocfs2_refcount_tree **ret_tree) | |
335 | { | |
336 | int ret = 0; | |
337 | struct ocfs2_refcount_tree *tree, *new = NULL; | |
338 | struct buffer_head *ref_root_bh = NULL; | |
339 | struct ocfs2_refcount_block *ref_rb; | |
340 | ||
341 | spin_lock(&osb->osb_lock); | |
342 | if (osb->osb_ref_tree_lru && | |
343 | osb->osb_ref_tree_lru->rf_blkno == rf_blkno) | |
344 | tree = osb->osb_ref_tree_lru; | |
345 | else | |
346 | tree = ocfs2_find_refcount_tree(osb, rf_blkno); | |
347 | if (tree) | |
348 | goto out; | |
349 | ||
350 | spin_unlock(&osb->osb_lock); | |
351 | ||
8bf396de | 352 | new = ocfs2_allocate_refcount_tree(osb, rf_blkno); |
374a263e TM |
353 | if (!new) { |
354 | ret = -ENOMEM; | |
8bf396de | 355 | mlog_errno(ret); |
374a263e TM |
356 | return ret; |
357 | } | |
374a263e TM |
358 | /* |
359 | * We need the generation to create the refcount tree lock and since | |
360 | * it isn't changed during the tree modification, we are safe here to | |
361 | * read without protection. | |
362 | * We also have to purge the cache after we create the lock since the | |
363 | * refcount block may have the stale data. It can only be trusted when | |
364 | * we hold the refcount lock. | |
365 | */ | |
366 | ret = ocfs2_read_refcount_block(&new->rf_ci, rf_blkno, &ref_root_bh); | |
367 | if (ret) { | |
368 | mlog_errno(ret); | |
369 | ocfs2_metadata_cache_exit(&new->rf_ci); | |
370 | kfree(new); | |
371 | return ret; | |
372 | } | |
373 | ||
374 | ref_rb = (struct ocfs2_refcount_block *)ref_root_bh->b_data; | |
375 | new->rf_generation = le32_to_cpu(ref_rb->rf_generation); | |
376 | ocfs2_init_refcount_tree_lock(osb, new, rf_blkno, | |
377 | new->rf_generation); | |
378 | ocfs2_metadata_cache_purge(&new->rf_ci); | |
379 | ||
380 | spin_lock(&osb->osb_lock); | |
381 | tree = ocfs2_find_refcount_tree(osb, rf_blkno); | |
382 | if (tree) | |
383 | goto out; | |
384 | ||
385 | ocfs2_insert_refcount_tree(osb, new); | |
386 | ||
387 | tree = new; | |
388 | new = NULL; | |
389 | ||
390 | out: | |
391 | *ret_tree = tree; | |
392 | ||
393 | osb->osb_ref_tree_lru = tree; | |
394 | ||
395 | spin_unlock(&osb->osb_lock); | |
396 | ||
397 | if (new) | |
398 | ocfs2_free_refcount_tree(new); | |
399 | ||
400 | brelse(ref_root_bh); | |
401 | return ret; | |
402 | } | |
403 | ||
404 | static int ocfs2_get_refcount_block(struct inode *inode, u64 *ref_blkno) | |
405 | { | |
406 | int ret; | |
407 | struct buffer_head *di_bh = NULL; | |
408 | struct ocfs2_dinode *di; | |
409 | ||
410 | ret = ocfs2_read_inode_block(inode, &di_bh); | |
411 | if (ret) { | |
412 | mlog_errno(ret); | |
413 | goto out; | |
414 | } | |
415 | ||
416 | BUG_ON(!(OCFS2_I(inode)->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL)); | |
417 | ||
418 | di = (struct ocfs2_dinode *)di_bh->b_data; | |
419 | *ref_blkno = le64_to_cpu(di->i_refcount_loc); | |
420 | brelse(di_bh); | |
421 | out: | |
422 | return ret; | |
423 | } | |
424 | ||
425 | static int __ocfs2_lock_refcount_tree(struct ocfs2_super *osb, | |
426 | struct ocfs2_refcount_tree *tree, int rw) | |
427 | { | |
428 | int ret; | |
429 | ||
430 | ret = ocfs2_refcount_lock(tree, rw); | |
431 | if (ret) { | |
432 | mlog_errno(ret); | |
433 | goto out; | |
434 | } | |
435 | ||
436 | if (rw) | |
437 | down_write(&tree->rf_sem); | |
438 | else | |
439 | down_read(&tree->rf_sem); | |
440 | ||
441 | out: | |
442 | return ret; | |
443 | } | |
444 | ||
445 | /* | |
446 | * Lock the refcount tree pointed by ref_blkno and return the tree. | |
447 | * In most case, we lock the tree and read the refcount block. | |
448 | * So read it here if the caller really needs it. | |
449 | * | |
450 | * If the tree has been re-created by other node, it will free the | |
451 | * old one and re-create it. | |
452 | */ | |
453 | int ocfs2_lock_refcount_tree(struct ocfs2_super *osb, | |
454 | u64 ref_blkno, int rw, | |
455 | struct ocfs2_refcount_tree **ret_tree, | |
456 | struct buffer_head **ref_bh) | |
457 | { | |
458 | int ret, delete_tree = 0; | |
459 | struct ocfs2_refcount_tree *tree = NULL; | |
460 | struct buffer_head *ref_root_bh = NULL; | |
461 | struct ocfs2_refcount_block *rb; | |
462 | ||
463 | again: | |
464 | ret = ocfs2_get_refcount_tree(osb, ref_blkno, &tree); | |
465 | if (ret) { | |
466 | mlog_errno(ret); | |
467 | return ret; | |
468 | } | |
469 | ||
470 | ocfs2_refcount_tree_get(tree); | |
471 | ||
472 | ret = __ocfs2_lock_refcount_tree(osb, tree, rw); | |
473 | if (ret) { | |
474 | mlog_errno(ret); | |
475 | ocfs2_refcount_tree_put(tree); | |
476 | goto out; | |
477 | } | |
478 | ||
479 | ret = ocfs2_read_refcount_block(&tree->rf_ci, tree->rf_blkno, | |
480 | &ref_root_bh); | |
481 | if (ret) { | |
482 | mlog_errno(ret); | |
483 | ocfs2_unlock_refcount_tree(osb, tree, rw); | |
484 | ocfs2_refcount_tree_put(tree); | |
485 | goto out; | |
486 | } | |
487 | ||
488 | rb = (struct ocfs2_refcount_block *)ref_root_bh->b_data; | |
489 | /* | |
490 | * If the refcount block has been freed and re-created, we may need | |
491 | * to recreate the refcount tree also. | |
492 | * | |
493 | * Here we just remove the tree from the rb-tree, and the last | |
494 | * kref holder will unlock and delete this refcount_tree. | |
495 | * Then we goto "again" and ocfs2_get_refcount_tree will create | |
496 | * the new refcount tree for us. | |
497 | */ | |
498 | if (tree->rf_generation != le32_to_cpu(rb->rf_generation)) { | |
499 | if (!tree->rf_removed) { | |
500 | ocfs2_erase_refcount_tree_from_list(osb, tree); | |
501 | tree->rf_removed = 1; | |
502 | delete_tree = 1; | |
503 | } | |
504 | ||
505 | ocfs2_unlock_refcount_tree(osb, tree, rw); | |
506 | /* | |
507 | * We get an extra reference when we create the refcount | |
508 | * tree, so another put will destroy it. | |
509 | */ | |
510 | if (delete_tree) | |
511 | ocfs2_refcount_tree_put(tree); | |
512 | brelse(ref_root_bh); | |
513 | ref_root_bh = NULL; | |
514 | goto again; | |
515 | } | |
516 | ||
517 | *ret_tree = tree; | |
518 | if (ref_bh) { | |
519 | *ref_bh = ref_root_bh; | |
520 | ref_root_bh = NULL; | |
521 | } | |
522 | out: | |
523 | brelse(ref_root_bh); | |
524 | return ret; | |
525 | } | |
526 | ||
527 | int ocfs2_lock_refcount_tree_by_inode(struct inode *inode, int rw, | |
528 | struct ocfs2_refcount_tree **ret_tree, | |
529 | struct buffer_head **ref_bh) | |
530 | { | |
531 | int ret; | |
532 | u64 ref_blkno; | |
533 | ||
534 | ret = ocfs2_get_refcount_block(inode, &ref_blkno); | |
535 | if (ret) { | |
536 | mlog_errno(ret); | |
537 | return ret; | |
538 | } | |
539 | ||
540 | return ocfs2_lock_refcount_tree(OCFS2_SB(inode->i_sb), ref_blkno, | |
541 | rw, ret_tree, ref_bh); | |
542 | } | |
543 | ||
544 | void ocfs2_unlock_refcount_tree(struct ocfs2_super *osb, | |
545 | struct ocfs2_refcount_tree *tree, int rw) | |
546 | { | |
547 | if (rw) | |
548 | up_write(&tree->rf_sem); | |
549 | else | |
550 | up_read(&tree->rf_sem); | |
551 | ||
552 | ocfs2_refcount_unlock(tree, rw); | |
553 | ocfs2_refcount_tree_put(tree); | |
554 | } | |
555 | ||
556 | void ocfs2_purge_refcount_trees(struct ocfs2_super *osb) | |
557 | { | |
558 | struct rb_node *node; | |
559 | struct ocfs2_refcount_tree *tree; | |
560 | struct rb_root *root = &osb->osb_rf_lock_tree; | |
561 | ||
562 | while ((node = rb_last(root)) != NULL) { | |
563 | tree = rb_entry(node, struct ocfs2_refcount_tree, rf_node); | |
564 | ||
565 | mlog(0, "Purge tree %llu\n", | |
566 | (unsigned long long) tree->rf_blkno); | |
567 | ||
568 | rb_erase(&tree->rf_node, root); | |
569 | ocfs2_free_refcount_tree(tree); | |
570 | } | |
571 | } | |
8bf396de TM |
572 | |
573 | /* | |
574 | * Create a refcount tree for an inode. | |
575 | * We take for granted that the inode is already locked. | |
576 | */ | |
577 | static int ocfs2_create_refcount_tree(struct inode *inode, | |
578 | struct buffer_head *di_bh) | |
579 | { | |
580 | int ret; | |
581 | handle_t *handle = NULL; | |
582 | struct ocfs2_alloc_context *meta_ac = NULL; | |
583 | struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data; | |
584 | struct ocfs2_inode_info *oi = OCFS2_I(inode); | |
585 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
586 | struct buffer_head *new_bh = NULL; | |
587 | struct ocfs2_refcount_block *rb; | |
588 | struct ocfs2_refcount_tree *new_tree = NULL, *tree = NULL; | |
589 | u16 suballoc_bit_start; | |
590 | u32 num_got; | |
591 | u64 first_blkno; | |
592 | ||
593 | BUG_ON(oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL); | |
594 | ||
595 | mlog(0, "create tree for inode %lu\n", inode->i_ino); | |
596 | ||
597 | ret = ocfs2_reserve_new_metadata_blocks(osb, 1, &meta_ac); | |
598 | if (ret) { | |
599 | mlog_errno(ret); | |
600 | goto out; | |
601 | } | |
602 | ||
603 | handle = ocfs2_start_trans(osb, OCFS2_REFCOUNT_TREE_CREATE_CREDITS); | |
604 | if (IS_ERR(handle)) { | |
605 | ret = PTR_ERR(handle); | |
606 | mlog_errno(ret); | |
607 | goto out; | |
608 | } | |
609 | ||
610 | ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh, | |
611 | OCFS2_JOURNAL_ACCESS_WRITE); | |
612 | if (ret) { | |
613 | mlog_errno(ret); | |
614 | goto out_commit; | |
615 | } | |
616 | ||
617 | ret = ocfs2_claim_metadata(osb, handle, meta_ac, 1, | |
618 | &suballoc_bit_start, &num_got, | |
619 | &first_blkno); | |
620 | if (ret) { | |
621 | mlog_errno(ret); | |
622 | goto out_commit; | |
623 | } | |
624 | ||
625 | new_tree = ocfs2_allocate_refcount_tree(osb, first_blkno); | |
626 | if (!new_tree) { | |
627 | ret = -ENOMEM; | |
628 | mlog_errno(ret); | |
629 | goto out_commit; | |
630 | } | |
631 | ||
632 | new_bh = sb_getblk(inode->i_sb, first_blkno); | |
633 | ocfs2_set_new_buffer_uptodate(&new_tree->rf_ci, new_bh); | |
634 | ||
635 | ret = ocfs2_journal_access_rb(handle, &new_tree->rf_ci, new_bh, | |
636 | OCFS2_JOURNAL_ACCESS_CREATE); | |
637 | if (ret) { | |
638 | mlog_errno(ret); | |
639 | goto out_commit; | |
640 | } | |
641 | ||
642 | /* Initialize ocfs2_refcount_block. */ | |
643 | rb = (struct ocfs2_refcount_block *)new_bh->b_data; | |
644 | memset(rb, 0, inode->i_sb->s_blocksize); | |
645 | strcpy((void *)rb, OCFS2_REFCOUNT_BLOCK_SIGNATURE); | |
646 | rb->rf_suballoc_slot = cpu_to_le16(osb->slot_num); | |
647 | rb->rf_suballoc_bit = cpu_to_le16(suballoc_bit_start); | |
648 | rb->rf_fs_generation = cpu_to_le32(osb->fs_generation); | |
649 | rb->rf_blkno = cpu_to_le64(first_blkno); | |
650 | rb->rf_count = cpu_to_le32(1); | |
651 | rb->rf_records.rl_count = | |
652 | cpu_to_le16(ocfs2_refcount_recs_per_rb(osb->sb)); | |
653 | spin_lock(&osb->osb_lock); | |
654 | rb->rf_generation = osb->s_next_generation++; | |
655 | spin_unlock(&osb->osb_lock); | |
656 | ||
657 | ocfs2_journal_dirty(handle, new_bh); | |
658 | ||
659 | spin_lock(&oi->ip_lock); | |
660 | oi->ip_dyn_features |= OCFS2_HAS_REFCOUNT_FL; | |
661 | di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features); | |
662 | di->i_refcount_loc = cpu_to_le64(first_blkno); | |
663 | spin_unlock(&oi->ip_lock); | |
664 | ||
665 | mlog(0, "created tree for inode %lu, refblock %llu\n", | |
666 | inode->i_ino, (unsigned long long)first_blkno); | |
667 | ||
668 | ocfs2_journal_dirty(handle, di_bh); | |
669 | ||
670 | /* | |
671 | * We have to init the tree lock here since it will use | |
672 | * the generation number to create it. | |
673 | */ | |
674 | new_tree->rf_generation = le32_to_cpu(rb->rf_generation); | |
675 | ocfs2_init_refcount_tree_lock(osb, new_tree, first_blkno, | |
676 | new_tree->rf_generation); | |
677 | ||
678 | spin_lock(&osb->osb_lock); | |
679 | tree = ocfs2_find_refcount_tree(osb, first_blkno); | |
680 | ||
681 | /* | |
682 | * We've just created a new refcount tree in this block. If | |
683 | * we found a refcount tree on the ocfs2_super, it must be | |
684 | * one we just deleted. We free the old tree before | |
685 | * inserting the new tree. | |
686 | */ | |
687 | BUG_ON(tree && tree->rf_generation == new_tree->rf_generation); | |
688 | if (tree) | |
689 | ocfs2_erase_refcount_tree_from_list_no_lock(osb, tree); | |
690 | ocfs2_insert_refcount_tree(osb, new_tree); | |
691 | spin_unlock(&osb->osb_lock); | |
692 | new_tree = NULL; | |
693 | if (tree) | |
694 | ocfs2_refcount_tree_put(tree); | |
695 | ||
696 | out_commit: | |
697 | ocfs2_commit_trans(osb, handle); | |
698 | ||
699 | out: | |
700 | if (new_tree) { | |
701 | ocfs2_metadata_cache_exit(&new_tree->rf_ci); | |
702 | kfree(new_tree); | |
703 | } | |
704 | ||
705 | brelse(new_bh); | |
706 | if (meta_ac) | |
707 | ocfs2_free_alloc_context(meta_ac); | |
708 | ||
709 | return ret; | |
710 | } | |
711 | ||
712 | static int ocfs2_set_refcount_tree(struct inode *inode, | |
713 | struct buffer_head *di_bh, | |
714 | u64 refcount_loc) | |
715 | { | |
716 | int ret; | |
717 | handle_t *handle = NULL; | |
718 | struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data; | |
719 | struct ocfs2_inode_info *oi = OCFS2_I(inode); | |
720 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
721 | struct buffer_head *ref_root_bh = NULL; | |
722 | struct ocfs2_refcount_block *rb; | |
723 | struct ocfs2_refcount_tree *ref_tree; | |
724 | ||
725 | BUG_ON(oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL); | |
726 | ||
727 | ret = ocfs2_lock_refcount_tree(osb, refcount_loc, 1, | |
728 | &ref_tree, &ref_root_bh); | |
729 | if (ret) { | |
730 | mlog_errno(ret); | |
731 | return ret; | |
732 | } | |
733 | ||
734 | handle = ocfs2_start_trans(osb, OCFS2_REFCOUNT_TREE_SET_CREDITS); | |
735 | if (IS_ERR(handle)) { | |
736 | ret = PTR_ERR(handle); | |
737 | mlog_errno(ret); | |
738 | goto out; | |
739 | } | |
740 | ||
741 | ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh, | |
742 | OCFS2_JOURNAL_ACCESS_WRITE); | |
743 | if (ret) { | |
744 | mlog_errno(ret); | |
745 | goto out_commit; | |
746 | } | |
747 | ||
748 | ret = ocfs2_journal_access_rb(handle, &ref_tree->rf_ci, ref_root_bh, | |
749 | OCFS2_JOURNAL_ACCESS_WRITE); | |
750 | if (ret) { | |
751 | mlog_errno(ret); | |
752 | goto out_commit; | |
753 | } | |
754 | ||
755 | rb = (struct ocfs2_refcount_block *)ref_root_bh->b_data; | |
756 | le32_add_cpu(&rb->rf_count, 1); | |
757 | ||
758 | ocfs2_journal_dirty(handle, ref_root_bh); | |
759 | ||
760 | spin_lock(&oi->ip_lock); | |
761 | oi->ip_dyn_features |= OCFS2_HAS_REFCOUNT_FL; | |
762 | di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features); | |
763 | di->i_refcount_loc = cpu_to_le64(refcount_loc); | |
764 | spin_unlock(&oi->ip_lock); | |
765 | ocfs2_journal_dirty(handle, di_bh); | |
766 | ||
767 | out_commit: | |
768 | ocfs2_commit_trans(osb, handle); | |
769 | out: | |
770 | ocfs2_unlock_refcount_tree(osb, ref_tree, 1); | |
771 | brelse(ref_root_bh); | |
772 | ||
773 | return ret; | |
774 | } | |
775 | ||
776 | int ocfs2_remove_refcount_tree(struct inode *inode, struct buffer_head *di_bh) | |
777 | { | |
778 | int ret, delete_tree = 0; | |
779 | handle_t *handle = NULL; | |
780 | struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data; | |
781 | struct ocfs2_inode_info *oi = OCFS2_I(inode); | |
782 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
783 | struct ocfs2_refcount_block *rb; | |
784 | struct inode *alloc_inode = NULL; | |
785 | struct buffer_head *alloc_bh = NULL; | |
786 | struct buffer_head *blk_bh = NULL; | |
787 | struct ocfs2_refcount_tree *ref_tree; | |
788 | int credits = OCFS2_REFCOUNT_TREE_REMOVE_CREDITS; | |
789 | u64 blk = 0, bg_blkno = 0, ref_blkno = le64_to_cpu(di->i_refcount_loc); | |
790 | u16 bit = 0; | |
791 | ||
792 | if (!(oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL)) | |
793 | return 0; | |
794 | ||
795 | BUG_ON(!ref_blkno); | |
796 | ret = ocfs2_lock_refcount_tree(osb, ref_blkno, 1, &ref_tree, &blk_bh); | |
797 | if (ret) { | |
798 | mlog_errno(ret); | |
799 | return ret; | |
800 | } | |
801 | ||
802 | rb = (struct ocfs2_refcount_block *)blk_bh->b_data; | |
803 | ||
804 | /* | |
805 | * If we are the last user, we need to free the block. | |
806 | * So lock the allocator ahead. | |
807 | */ | |
808 | if (le32_to_cpu(rb->rf_count) == 1) { | |
809 | blk = le64_to_cpu(rb->rf_blkno); | |
810 | bit = le16_to_cpu(rb->rf_suballoc_bit); | |
811 | bg_blkno = ocfs2_which_suballoc_group(blk, bit); | |
812 | ||
813 | alloc_inode = ocfs2_get_system_file_inode(osb, | |
814 | EXTENT_ALLOC_SYSTEM_INODE, | |
815 | le16_to_cpu(rb->rf_suballoc_slot)); | |
816 | if (!alloc_inode) { | |
817 | ret = -ENOMEM; | |
818 | mlog_errno(ret); | |
819 | goto out; | |
820 | } | |
821 | mutex_lock(&alloc_inode->i_mutex); | |
822 | ||
823 | ret = ocfs2_inode_lock(alloc_inode, &alloc_bh, 1); | |
824 | if (ret) { | |
825 | mlog_errno(ret); | |
826 | goto out_mutex; | |
827 | } | |
828 | ||
829 | credits += OCFS2_SUBALLOC_FREE; | |
830 | } | |
831 | ||
832 | handle = ocfs2_start_trans(osb, credits); | |
833 | if (IS_ERR(handle)) { | |
834 | ret = PTR_ERR(handle); | |
835 | mlog_errno(ret); | |
836 | goto out_unlock; | |
837 | } | |
838 | ||
839 | ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh, | |
840 | OCFS2_JOURNAL_ACCESS_WRITE); | |
841 | if (ret) { | |
842 | mlog_errno(ret); | |
843 | goto out_commit; | |
844 | } | |
845 | ||
846 | ret = ocfs2_journal_access_rb(handle, &ref_tree->rf_ci, blk_bh, | |
847 | OCFS2_JOURNAL_ACCESS_WRITE); | |
848 | if (ret) { | |
849 | mlog_errno(ret); | |
850 | goto out_commit; | |
851 | } | |
852 | ||
853 | spin_lock(&oi->ip_lock); | |
854 | oi->ip_dyn_features &= ~OCFS2_HAS_REFCOUNT_FL; | |
855 | di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features); | |
856 | di->i_refcount_loc = 0; | |
857 | spin_unlock(&oi->ip_lock); | |
858 | ocfs2_journal_dirty(handle, di_bh); | |
859 | ||
860 | le32_add_cpu(&rb->rf_count , -1); | |
861 | ocfs2_journal_dirty(handle, blk_bh); | |
862 | ||
863 | if (!rb->rf_count) { | |
864 | delete_tree = 1; | |
865 | ocfs2_erase_refcount_tree_from_list(osb, ref_tree); | |
866 | ret = ocfs2_free_suballoc_bits(handle, alloc_inode, | |
867 | alloc_bh, bit, bg_blkno, 1); | |
868 | if (ret) | |
869 | mlog_errno(ret); | |
870 | } | |
871 | ||
872 | out_commit: | |
873 | ocfs2_commit_trans(osb, handle); | |
874 | out_unlock: | |
875 | if (alloc_inode) { | |
876 | ocfs2_inode_unlock(alloc_inode, 1); | |
877 | brelse(alloc_bh); | |
878 | } | |
879 | out_mutex: | |
880 | if (alloc_inode) { | |
881 | mutex_unlock(&alloc_inode->i_mutex); | |
882 | iput(alloc_inode); | |
883 | } | |
884 | out: | |
885 | ocfs2_unlock_refcount_tree(osb, ref_tree, 1); | |
886 | if (delete_tree) | |
887 | ocfs2_refcount_tree_put(ref_tree); | |
888 | brelse(blk_bh); | |
889 | ||
890 | return ret; | |
891 | } | |
e73a819d TM |
892 | |
893 | static void ocfs2_find_refcount_rec_in_rl(struct ocfs2_caching_info *ci, | |
894 | struct buffer_head *ref_leaf_bh, | |
895 | u64 cpos, unsigned int len, | |
896 | struct ocfs2_refcount_rec *ret_rec, | |
897 | int *index) | |
898 | { | |
899 | int i = 0; | |
900 | struct ocfs2_refcount_block *rb = | |
901 | (struct ocfs2_refcount_block *)ref_leaf_bh->b_data; | |
902 | struct ocfs2_refcount_rec *rec = NULL; | |
903 | ||
904 | for (; i < le16_to_cpu(rb->rf_records.rl_used); i++) { | |
905 | rec = &rb->rf_records.rl_recs[i]; | |
906 | ||
907 | if (le64_to_cpu(rec->r_cpos) + | |
908 | le32_to_cpu(rec->r_clusters) <= cpos) | |
909 | continue; | |
910 | else if (le64_to_cpu(rec->r_cpos) > cpos) | |
911 | break; | |
912 | ||
913 | /* ok, cpos fail in this rec. Just return. */ | |
914 | if (ret_rec) | |
915 | *ret_rec = *rec; | |
916 | goto out; | |
917 | } | |
918 | ||
919 | if (ret_rec) { | |
920 | /* We meet with a hole here, so fake the rec. */ | |
921 | ret_rec->r_cpos = cpu_to_le64(cpos); | |
922 | ret_rec->r_refcount = 0; | |
923 | if (i < le16_to_cpu(rb->rf_records.rl_used) && | |
924 | le64_to_cpu(rec->r_cpos) < cpos + len) | |
925 | ret_rec->r_clusters = | |
926 | cpu_to_le32(le64_to_cpu(rec->r_cpos) - cpos); | |
927 | else | |
928 | ret_rec->r_clusters = cpu_to_le32(len); | |
929 | } | |
930 | ||
931 | out: | |
932 | *index = i; | |
933 | } | |
934 | ||
8b2c0dba TM |
935 | /* |
936 | * Try to remove refcount tree. The mechanism is: | |
937 | * 1) Check whether i_clusters == 0, if no, exit. | |
938 | * 2) check whether we have i_xattr_loc in dinode. if yes, exit. | |
939 | * 3) Check whether we have inline xattr stored outside, if yes, exit. | |
940 | * 4) Remove the tree. | |
941 | */ | |
942 | int ocfs2_try_remove_refcount_tree(struct inode *inode, | |
943 | struct buffer_head *di_bh) | |
944 | { | |
945 | int ret; | |
946 | struct ocfs2_inode_info *oi = OCFS2_I(inode); | |
947 | struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data; | |
948 | ||
949 | down_write(&oi->ip_xattr_sem); | |
950 | down_write(&oi->ip_alloc_sem); | |
951 | ||
952 | if (oi->ip_clusters) | |
953 | goto out; | |
954 | ||
955 | if ((oi->ip_dyn_features & OCFS2_HAS_XATTR_FL) && di->i_xattr_loc) | |
956 | goto out; | |
957 | ||
958 | if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL && | |
959 | ocfs2_has_inline_xattr_value_outside(inode, di)) | |
960 | goto out; | |
961 | ||
962 | ret = ocfs2_remove_refcount_tree(inode, di_bh); | |
963 | if (ret) | |
964 | mlog_errno(ret); | |
965 | out: | |
966 | up_write(&oi->ip_alloc_sem); | |
967 | up_write(&oi->ip_xattr_sem); | |
968 | return 0; | |
969 | } | |
970 | ||
e73a819d TM |
971 | /* |
972 | * Given a cpos and len, try to find the refcount record which contains cpos. | |
973 | * 1. If cpos can be found in one refcount record, return the record. | |
974 | * 2. If cpos can't be found, return a fake record which start from cpos | |
975 | * and end at a small value between cpos+len and start of the next record. | |
976 | * This fake record has r_refcount = 0. | |
977 | */ | |
978 | static int ocfs2_get_refcount_rec(struct ocfs2_caching_info *ci, | |
979 | struct buffer_head *ref_root_bh, | |
980 | u64 cpos, unsigned int len, | |
981 | struct ocfs2_refcount_rec *ret_rec, | |
982 | int *index, | |
983 | struct buffer_head **ret_bh) | |
984 | { | |
985 | int ret = 0, i, found; | |
986 | u32 low_cpos; | |
987 | struct ocfs2_extent_list *el; | |
988 | struct ocfs2_extent_rec *tmp, *rec = NULL; | |
989 | struct ocfs2_extent_block *eb; | |
990 | struct buffer_head *eb_bh = NULL, *ref_leaf_bh = NULL; | |
991 | struct super_block *sb = ocfs2_metadata_cache_get_super(ci); | |
992 | struct ocfs2_refcount_block *rb = | |
993 | (struct ocfs2_refcount_block *)ref_root_bh->b_data; | |
994 | ||
995 | if (!(le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL)) { | |
996 | ocfs2_find_refcount_rec_in_rl(ci, ref_root_bh, cpos, len, | |
997 | ret_rec, index); | |
998 | *ret_bh = ref_root_bh; | |
999 | get_bh(ref_root_bh); | |
1000 | return 0; | |
1001 | } | |
1002 | ||
1003 | el = &rb->rf_list; | |
1004 | low_cpos = cpos & OCFS2_32BIT_POS_MASK; | |
1005 | ||
1006 | if (el->l_tree_depth) { | |
1007 | ret = ocfs2_find_leaf(ci, el, low_cpos, &eb_bh); | |
1008 | if (ret) { | |
1009 | mlog_errno(ret); | |
1010 | goto out; | |
1011 | } | |
1012 | ||
1013 | eb = (struct ocfs2_extent_block *) eb_bh->b_data; | |
1014 | el = &eb->h_list; | |
1015 | ||
1016 | if (el->l_tree_depth) { | |
1017 | ocfs2_error(sb, | |
1018 | "refcount tree %llu has non zero tree " | |
1019 | "depth in leaf btree tree block %llu\n", | |
1020 | (unsigned long long)ocfs2_metadata_cache_owner(ci), | |
1021 | (unsigned long long)eb_bh->b_blocknr); | |
1022 | ret = -EROFS; | |
1023 | goto out; | |
1024 | } | |
1025 | } | |
1026 | ||
1027 | found = 0; | |
1028 | for (i = le16_to_cpu(el->l_next_free_rec) - 1; i >= 0; i--) { | |
1029 | rec = &el->l_recs[i]; | |
1030 | ||
1031 | if (le32_to_cpu(rec->e_cpos) <= low_cpos) { | |
1032 | found = 1; | |
1033 | break; | |
1034 | } | |
1035 | } | |
1036 | ||
1037 | /* adjust len when we have ocfs2_extent_rec after it. */ | |
1038 | if (found && i < le16_to_cpu(el->l_next_free_rec) - 1) { | |
1039 | tmp = &el->l_recs[i+1]; | |
1040 | ||
1041 | if (le32_to_cpu(tmp->e_cpos) < cpos + len) | |
1042 | len = le32_to_cpu(tmp->e_cpos) - cpos; | |
1043 | } | |
1044 | ||
1045 | ret = ocfs2_read_refcount_block(ci, le64_to_cpu(rec->e_blkno), | |
1046 | &ref_leaf_bh); | |
1047 | if (ret) { | |
1048 | mlog_errno(ret); | |
1049 | goto out; | |
1050 | } | |
1051 | ||
1052 | ocfs2_find_refcount_rec_in_rl(ci, ref_leaf_bh, cpos, len, | |
1053 | ret_rec, index); | |
1054 | *ret_bh = ref_leaf_bh; | |
1055 | out: | |
1056 | brelse(eb_bh); | |
1057 | return ret; | |
1058 | } | |
1059 | ||
1060 | enum ocfs2_ref_rec_contig { | |
1061 | REF_CONTIG_NONE = 0, | |
1062 | REF_CONTIG_LEFT, | |
1063 | REF_CONTIG_RIGHT, | |
1064 | REF_CONTIG_LEFTRIGHT, | |
1065 | }; | |
1066 | ||
1067 | static enum ocfs2_ref_rec_contig | |
1068 | ocfs2_refcount_rec_adjacent(struct ocfs2_refcount_block *rb, | |
1069 | int index) | |
1070 | { | |
1071 | if ((rb->rf_records.rl_recs[index].r_refcount == | |
1072 | rb->rf_records.rl_recs[index + 1].r_refcount) && | |
1073 | (le64_to_cpu(rb->rf_records.rl_recs[index].r_cpos) + | |
1074 | le32_to_cpu(rb->rf_records.rl_recs[index].r_clusters) == | |
1075 | le64_to_cpu(rb->rf_records.rl_recs[index + 1].r_cpos))) | |
1076 | return REF_CONTIG_RIGHT; | |
1077 | ||
1078 | return REF_CONTIG_NONE; | |
1079 | } | |
1080 | ||
1081 | static enum ocfs2_ref_rec_contig | |
1082 | ocfs2_refcount_rec_contig(struct ocfs2_refcount_block *rb, | |
1083 | int index) | |
1084 | { | |
1085 | enum ocfs2_ref_rec_contig ret = REF_CONTIG_NONE; | |
1086 | ||
1087 | if (index < le16_to_cpu(rb->rf_records.rl_used) - 1) | |
1088 | ret = ocfs2_refcount_rec_adjacent(rb, index); | |
1089 | ||
1090 | if (index > 0) { | |
1091 | enum ocfs2_ref_rec_contig tmp; | |
1092 | ||
1093 | tmp = ocfs2_refcount_rec_adjacent(rb, index - 1); | |
1094 | ||
1095 | if (tmp == REF_CONTIG_RIGHT) { | |
1096 | if (ret == REF_CONTIG_RIGHT) | |
1097 | ret = REF_CONTIG_LEFTRIGHT; | |
1098 | else | |
1099 | ret = REF_CONTIG_LEFT; | |
1100 | } | |
1101 | } | |
1102 | ||
1103 | return ret; | |
1104 | } | |
1105 | ||
1106 | static void ocfs2_rotate_refcount_rec_left(struct ocfs2_refcount_block *rb, | |
1107 | int index) | |
1108 | { | |
1109 | BUG_ON(rb->rf_records.rl_recs[index].r_refcount != | |
1110 | rb->rf_records.rl_recs[index+1].r_refcount); | |
1111 | ||
1112 | le32_add_cpu(&rb->rf_records.rl_recs[index].r_clusters, | |
1113 | le32_to_cpu(rb->rf_records.rl_recs[index+1].r_clusters)); | |
1114 | ||
1115 | if (index < le16_to_cpu(rb->rf_records.rl_used) - 2) | |
1116 | memmove(&rb->rf_records.rl_recs[index + 1], | |
1117 | &rb->rf_records.rl_recs[index + 2], | |
1118 | sizeof(struct ocfs2_refcount_rec) * | |
1119 | (le16_to_cpu(rb->rf_records.rl_used) - index - 2)); | |
1120 | ||
1121 | memset(&rb->rf_records.rl_recs[le16_to_cpu(rb->rf_records.rl_used) - 1], | |
1122 | 0, sizeof(struct ocfs2_refcount_rec)); | |
1123 | le16_add_cpu(&rb->rf_records.rl_used, -1); | |
1124 | } | |
1125 | ||
1126 | /* | |
1127 | * Merge the refcount rec if we are contiguous with the adjacent recs. | |
1128 | */ | |
1129 | static void ocfs2_refcount_rec_merge(struct ocfs2_refcount_block *rb, | |
1130 | int index) | |
1131 | { | |
1132 | enum ocfs2_ref_rec_contig contig = | |
1133 | ocfs2_refcount_rec_contig(rb, index); | |
1134 | ||
1135 | if (contig == REF_CONTIG_NONE) | |
1136 | return; | |
1137 | ||
1138 | if (contig == REF_CONTIG_LEFT || contig == REF_CONTIG_LEFTRIGHT) { | |
1139 | BUG_ON(index == 0); | |
1140 | index--; | |
1141 | } | |
1142 | ||
1143 | ocfs2_rotate_refcount_rec_left(rb, index); | |
1144 | ||
1145 | if (contig == REF_CONTIG_LEFTRIGHT) | |
1146 | ocfs2_rotate_refcount_rec_left(rb, index); | |
1147 | } | |
1148 | ||
1823cb0b TM |
1149 | /* |
1150 | * Change the refcount indexed by "index" in ref_bh. | |
1151 | * If refcount reaches 0, remove it. | |
1152 | */ | |
e73a819d TM |
1153 | static int ocfs2_change_refcount_rec(handle_t *handle, |
1154 | struct ocfs2_caching_info *ci, | |
1155 | struct buffer_head *ref_leaf_bh, | |
7540c1a7 | 1156 | int index, int merge, int change) |
e73a819d TM |
1157 | { |
1158 | int ret; | |
1159 | struct ocfs2_refcount_block *rb = | |
1160 | (struct ocfs2_refcount_block *)ref_leaf_bh->b_data; | |
1823cb0b TM |
1161 | struct ocfs2_refcount_list *rl = &rb->rf_records; |
1162 | struct ocfs2_refcount_rec *rec = &rl->rl_recs[index]; | |
e73a819d TM |
1163 | |
1164 | ret = ocfs2_journal_access_rb(handle, ci, ref_leaf_bh, | |
1165 | OCFS2_JOURNAL_ACCESS_WRITE); | |
1166 | if (ret) { | |
1167 | mlog_errno(ret); | |
1168 | goto out; | |
1169 | } | |
1170 | ||
1171 | mlog(0, "change index %d, old count %u, change %d\n", index, | |
1172 | le32_to_cpu(rec->r_refcount), change); | |
1173 | le32_add_cpu(&rec->r_refcount, change); | |
1174 | ||
1823cb0b TM |
1175 | if (!rec->r_refcount) { |
1176 | if (index != le16_to_cpu(rl->rl_used) - 1) { | |
1177 | memmove(rec, rec + 1, | |
1178 | (le16_to_cpu(rl->rl_used) - index - 1) * | |
1179 | sizeof(struct ocfs2_refcount_rec)); | |
1180 | memset(&rl->rl_recs[le16_to_cpu(rl->rl_used) - 1], | |
1181 | 0, sizeof(struct ocfs2_refcount_rec)); | |
1182 | } | |
1183 | ||
1184 | le16_add_cpu(&rl->rl_used, -1); | |
7540c1a7 | 1185 | } else if (merge) |
1823cb0b | 1186 | ocfs2_refcount_rec_merge(rb, index); |
e73a819d TM |
1187 | |
1188 | ret = ocfs2_journal_dirty(handle, ref_leaf_bh); | |
1189 | if (ret) | |
1190 | mlog_errno(ret); | |
1191 | out: | |
1192 | return ret; | |
1193 | } | |
1194 | ||
1195 | static int ocfs2_expand_inline_ref_root(handle_t *handle, | |
1196 | struct ocfs2_caching_info *ci, | |
1197 | struct buffer_head *ref_root_bh, | |
1198 | struct buffer_head **ref_leaf_bh, | |
1199 | struct ocfs2_alloc_context *meta_ac) | |
1200 | { | |
1201 | int ret; | |
1202 | u16 suballoc_bit_start; | |
1203 | u32 num_got; | |
1204 | u64 blkno; | |
1205 | struct super_block *sb = ocfs2_metadata_cache_get_super(ci); | |
1206 | struct buffer_head *new_bh = NULL; | |
1207 | struct ocfs2_refcount_block *new_rb; | |
1208 | struct ocfs2_refcount_block *root_rb = | |
1209 | (struct ocfs2_refcount_block *)ref_root_bh->b_data; | |
1210 | ||
1211 | ret = ocfs2_journal_access_rb(handle, ci, ref_root_bh, | |
1212 | OCFS2_JOURNAL_ACCESS_WRITE); | |
1213 | if (ret) { | |
1214 | mlog_errno(ret); | |
1215 | goto out; | |
1216 | } | |
1217 | ||
1218 | ret = ocfs2_claim_metadata(OCFS2_SB(sb), handle, meta_ac, 1, | |
1219 | &suballoc_bit_start, &num_got, | |
1220 | &blkno); | |
1221 | if (ret) { | |
1222 | mlog_errno(ret); | |
1223 | goto out; | |
1224 | } | |
1225 | ||
1226 | new_bh = sb_getblk(sb, blkno); | |
1227 | if (new_bh == NULL) { | |
1228 | ret = -EIO; | |
1229 | mlog_errno(ret); | |
1230 | goto out; | |
1231 | } | |
1232 | ocfs2_set_new_buffer_uptodate(ci, new_bh); | |
1233 | ||
1234 | ret = ocfs2_journal_access_rb(handle, ci, new_bh, | |
1235 | OCFS2_JOURNAL_ACCESS_CREATE); | |
1236 | if (ret) { | |
1237 | mlog_errno(ret); | |
1238 | goto out; | |
1239 | } | |
1240 | ||
1241 | /* | |
1242 | * Initialize ocfs2_refcount_block. | |
1243 | * It should contain the same information as the old root. | |
1244 | * so just memcpy it and change the corresponding field. | |
1245 | */ | |
1246 | memcpy(new_bh->b_data, ref_root_bh->b_data, sb->s_blocksize); | |
1247 | ||
1248 | new_rb = (struct ocfs2_refcount_block *)new_bh->b_data; | |
1249 | new_rb->rf_suballoc_slot = cpu_to_le16(OCFS2_SB(sb)->slot_num); | |
1250 | new_rb->rf_suballoc_bit = cpu_to_le16(suballoc_bit_start); | |
1251 | new_rb->rf_blkno = cpu_to_le64(blkno); | |
1252 | new_rb->rf_cpos = cpu_to_le32(0); | |
1253 | new_rb->rf_parent = cpu_to_le64(ref_root_bh->b_blocknr); | |
1254 | new_rb->rf_flags = cpu_to_le32(OCFS2_REFCOUNT_LEAF_FL); | |
1255 | ocfs2_journal_dirty(handle, new_bh); | |
1256 | ||
1257 | /* Now change the root. */ | |
1258 | memset(&root_rb->rf_list, 0, sb->s_blocksize - | |
1259 | offsetof(struct ocfs2_refcount_block, rf_list)); | |
1260 | root_rb->rf_list.l_count = cpu_to_le16(ocfs2_extent_recs_per_rb(sb)); | |
1261 | root_rb->rf_clusters = cpu_to_le32(1); | |
1262 | root_rb->rf_list.l_next_free_rec = cpu_to_le16(1); | |
1263 | root_rb->rf_list.l_recs[0].e_blkno = cpu_to_le64(blkno); | |
1264 | root_rb->rf_list.l_recs[0].e_leaf_clusters = cpu_to_le16(1); | |
1265 | root_rb->rf_flags = cpu_to_le32(OCFS2_REFCOUNT_TREE_FL); | |
1266 | ||
1267 | ocfs2_journal_dirty(handle, ref_root_bh); | |
1268 | ||
1269 | mlog(0, "new leaf block %llu, used %u\n", (unsigned long long)blkno, | |
1270 | le16_to_cpu(new_rb->rf_records.rl_used)); | |
1271 | ||
1272 | *ref_leaf_bh = new_bh; | |
1273 | new_bh = NULL; | |
1274 | out: | |
1275 | brelse(new_bh); | |
1276 | return ret; | |
1277 | } | |
1278 | ||
1279 | static int ocfs2_refcount_rec_no_intersect(struct ocfs2_refcount_rec *prev, | |
1280 | struct ocfs2_refcount_rec *next) | |
1281 | { | |
1282 | if (ocfs2_get_ref_rec_low_cpos(prev) + le32_to_cpu(prev->r_clusters) <= | |
1283 | ocfs2_get_ref_rec_low_cpos(next)) | |
1284 | return 1; | |
1285 | ||
1286 | return 0; | |
1287 | } | |
1288 | ||
1289 | static int cmp_refcount_rec_by_low_cpos(const void *a, const void *b) | |
1290 | { | |
1291 | const struct ocfs2_refcount_rec *l = a, *r = b; | |
1292 | u32 l_cpos = ocfs2_get_ref_rec_low_cpos(l); | |
1293 | u32 r_cpos = ocfs2_get_ref_rec_low_cpos(r); | |
1294 | ||
1295 | if (l_cpos > r_cpos) | |
1296 | return 1; | |
1297 | if (l_cpos < r_cpos) | |
1298 | return -1; | |
1299 | return 0; | |
1300 | } | |
1301 | ||
1302 | static int cmp_refcount_rec_by_cpos(const void *a, const void *b) | |
1303 | { | |
1304 | const struct ocfs2_refcount_rec *l = a, *r = b; | |
1305 | u64 l_cpos = le64_to_cpu(l->r_cpos); | |
1306 | u64 r_cpos = le64_to_cpu(r->r_cpos); | |
1307 | ||
1308 | if (l_cpos > r_cpos) | |
1309 | return 1; | |
1310 | if (l_cpos < r_cpos) | |
1311 | return -1; | |
1312 | return 0; | |
1313 | } | |
1314 | ||
1315 | static void swap_refcount_rec(void *a, void *b, int size) | |
1316 | { | |
1317 | struct ocfs2_refcount_rec *l = a, *r = b, tmp; | |
1318 | ||
1319 | tmp = *(struct ocfs2_refcount_rec *)l; | |
1320 | *(struct ocfs2_refcount_rec *)l = | |
1321 | *(struct ocfs2_refcount_rec *)r; | |
1322 | *(struct ocfs2_refcount_rec *)r = tmp; | |
1323 | } | |
1324 | ||
1325 | /* | |
1326 | * The refcount cpos are ordered by their 64bit cpos, | |
1327 | * But we will use the low 32 bit to be the e_cpos in the b-tree. | |
1328 | * So we need to make sure that this pos isn't intersected with others. | |
1329 | * | |
1330 | * Note: The refcount block is already sorted by their low 32 bit cpos, | |
1331 | * So just try the middle pos first, and we will exit when we find | |
1332 | * the good position. | |
1333 | */ | |
1334 | static int ocfs2_find_refcount_split_pos(struct ocfs2_refcount_list *rl, | |
1335 | u32 *split_pos, int *split_index) | |
1336 | { | |
1337 | int num_used = le16_to_cpu(rl->rl_used); | |
1338 | int delta, middle = num_used / 2; | |
1339 | ||
1340 | for (delta = 0; delta < middle; delta++) { | |
1341 | /* Let's check delta earlier than middle */ | |
1342 | if (ocfs2_refcount_rec_no_intersect( | |
1343 | &rl->rl_recs[middle - delta - 1], | |
1344 | &rl->rl_recs[middle - delta])) { | |
1345 | *split_index = middle - delta; | |
1346 | break; | |
1347 | } | |
1348 | ||
1349 | /* For even counts, don't walk off the end */ | |
1350 | if ((middle + delta + 1) == num_used) | |
1351 | continue; | |
1352 | ||
1353 | /* Now try delta past middle */ | |
1354 | if (ocfs2_refcount_rec_no_intersect( | |
1355 | &rl->rl_recs[middle + delta], | |
1356 | &rl->rl_recs[middle + delta + 1])) { | |
1357 | *split_index = middle + delta + 1; | |
1358 | break; | |
1359 | } | |
1360 | } | |
1361 | ||
1362 | if (delta >= middle) | |
1363 | return -ENOSPC; | |
1364 | ||
1365 | *split_pos = ocfs2_get_ref_rec_low_cpos(&rl->rl_recs[*split_index]); | |
1366 | return 0; | |
1367 | } | |
1368 | ||
1369 | static int ocfs2_divide_leaf_refcount_block(struct buffer_head *ref_leaf_bh, | |
1370 | struct buffer_head *new_bh, | |
1371 | u32 *split_cpos) | |
1372 | { | |
1373 | int split_index = 0, num_moved, ret; | |
1374 | u32 cpos = 0; | |
1375 | struct ocfs2_refcount_block *rb = | |
1376 | (struct ocfs2_refcount_block *)ref_leaf_bh->b_data; | |
1377 | struct ocfs2_refcount_list *rl = &rb->rf_records; | |
1378 | struct ocfs2_refcount_block *new_rb = | |
1379 | (struct ocfs2_refcount_block *)new_bh->b_data; | |
1380 | struct ocfs2_refcount_list *new_rl = &new_rb->rf_records; | |
1381 | ||
1382 | mlog(0, "split old leaf refcount block %llu, count = %u, used = %u\n", | |
1383 | (unsigned long long)ref_leaf_bh->b_blocknr, | |
1384 | le32_to_cpu(rl->rl_count), le32_to_cpu(rl->rl_used)); | |
1385 | ||
1386 | /* | |
1387 | * XXX: Improvement later. | |
1388 | * If we know all the high 32 bit cpos is the same, no need to sort. | |
1389 | * | |
1390 | * In order to make the whole process safe, we do: | |
1391 | * 1. sort the entries by their low 32 bit cpos first so that we can | |
1392 | * find the split cpos easily. | |
1393 | * 2. call ocfs2_insert_extent to insert the new refcount block. | |
1394 | * 3. move the refcount rec to the new block. | |
1395 | * 4. sort the entries by their 64 bit cpos. | |
1396 | * 5. dirty the new_rb and rb. | |
1397 | */ | |
1398 | sort(&rl->rl_recs, le16_to_cpu(rl->rl_used), | |
1399 | sizeof(struct ocfs2_refcount_rec), | |
1400 | cmp_refcount_rec_by_low_cpos, swap_refcount_rec); | |
1401 | ||
1402 | ret = ocfs2_find_refcount_split_pos(rl, &cpos, &split_index); | |
1403 | if (ret) { | |
1404 | mlog_errno(ret); | |
1405 | return ret; | |
1406 | } | |
1407 | ||
1408 | new_rb->rf_cpos = cpu_to_le32(cpos); | |
1409 | ||
1410 | /* move refcount records starting from split_index to the new block. */ | |
1411 | num_moved = le16_to_cpu(rl->rl_used) - split_index; | |
1412 | memcpy(new_rl->rl_recs, &rl->rl_recs[split_index], | |
1413 | num_moved * sizeof(struct ocfs2_refcount_rec)); | |
1414 | ||
1415 | /*ok, remove the entries we just moved over to the other block. */ | |
1416 | memset(&rl->rl_recs[split_index], 0, | |
1417 | num_moved * sizeof(struct ocfs2_refcount_rec)); | |
1418 | ||
1419 | /* change old and new rl_used accordingly. */ | |
1420 | le16_add_cpu(&rl->rl_used, -num_moved); | |
1421 | new_rl->rl_used = cpu_to_le32(num_moved); | |
1422 | ||
1423 | sort(&rl->rl_recs, le16_to_cpu(rl->rl_used), | |
1424 | sizeof(struct ocfs2_refcount_rec), | |
1425 | cmp_refcount_rec_by_cpos, swap_refcount_rec); | |
1426 | ||
1427 | sort(&new_rl->rl_recs, le16_to_cpu(new_rl->rl_used), | |
1428 | sizeof(struct ocfs2_refcount_rec), | |
1429 | cmp_refcount_rec_by_cpos, swap_refcount_rec); | |
1430 | ||
1431 | *split_cpos = cpos; | |
1432 | return 0; | |
1433 | } | |
1434 | ||
1435 | static int ocfs2_new_leaf_refcount_block(handle_t *handle, | |
1436 | struct ocfs2_caching_info *ci, | |
1437 | struct buffer_head *ref_root_bh, | |
1438 | struct buffer_head *ref_leaf_bh, | |
1439 | struct ocfs2_alloc_context *meta_ac) | |
1440 | { | |
1441 | int ret; | |
1442 | u16 suballoc_bit_start; | |
1443 | u32 num_got, new_cpos; | |
1444 | u64 blkno; | |
1445 | struct super_block *sb = ocfs2_metadata_cache_get_super(ci); | |
1446 | struct ocfs2_refcount_block *root_rb = | |
1447 | (struct ocfs2_refcount_block *)ref_root_bh->b_data; | |
1448 | struct buffer_head *new_bh = NULL; | |
1449 | struct ocfs2_refcount_block *new_rb; | |
1450 | struct ocfs2_extent_tree ref_et; | |
1451 | ||
1452 | BUG_ON(!(le32_to_cpu(root_rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL)); | |
1453 | ||
1454 | ret = ocfs2_journal_access_rb(handle, ci, ref_root_bh, | |
1455 | OCFS2_JOURNAL_ACCESS_WRITE); | |
1456 | if (ret) { | |
1457 | mlog_errno(ret); | |
1458 | goto out; | |
1459 | } | |
1460 | ||
1461 | ret = ocfs2_journal_access_rb(handle, ci, ref_leaf_bh, | |
1462 | OCFS2_JOURNAL_ACCESS_WRITE); | |
1463 | if (ret) { | |
1464 | mlog_errno(ret); | |
1465 | goto out; | |
1466 | } | |
1467 | ||
1468 | ret = ocfs2_claim_metadata(OCFS2_SB(sb), handle, meta_ac, 1, | |
1469 | &suballoc_bit_start, &num_got, | |
1470 | &blkno); | |
1471 | if (ret) { | |
1472 | mlog_errno(ret); | |
1473 | goto out; | |
1474 | } | |
1475 | ||
1476 | new_bh = sb_getblk(sb, blkno); | |
1477 | if (new_bh == NULL) { | |
1478 | ret = -EIO; | |
1479 | mlog_errno(ret); | |
1480 | goto out; | |
1481 | } | |
1482 | ocfs2_set_new_buffer_uptodate(ci, new_bh); | |
1483 | ||
1484 | ret = ocfs2_journal_access_rb(handle, ci, new_bh, | |
1485 | OCFS2_JOURNAL_ACCESS_CREATE); | |
1486 | if (ret) { | |
1487 | mlog_errno(ret); | |
1488 | goto out; | |
1489 | } | |
1490 | ||
1491 | /* Initialize ocfs2_refcount_block. */ | |
1492 | new_rb = (struct ocfs2_refcount_block *)new_bh->b_data; | |
1493 | memset(new_rb, 0, sb->s_blocksize); | |
1494 | strcpy((void *)new_rb, OCFS2_REFCOUNT_BLOCK_SIGNATURE); | |
1495 | new_rb->rf_suballoc_slot = cpu_to_le16(OCFS2_SB(sb)->slot_num); | |
1496 | new_rb->rf_suballoc_bit = cpu_to_le16(suballoc_bit_start); | |
1497 | new_rb->rf_fs_generation = cpu_to_le32(OCFS2_SB(sb)->fs_generation); | |
1498 | new_rb->rf_blkno = cpu_to_le64(blkno); | |
1499 | new_rb->rf_parent = cpu_to_le64(ref_root_bh->b_blocknr); | |
1500 | new_rb->rf_flags = cpu_to_le32(OCFS2_REFCOUNT_LEAF_FL); | |
1501 | new_rb->rf_records.rl_count = | |
1502 | cpu_to_le16(ocfs2_refcount_recs_per_rb(sb)); | |
1503 | new_rb->rf_generation = root_rb->rf_generation; | |
1504 | ||
1505 | ret = ocfs2_divide_leaf_refcount_block(ref_leaf_bh, new_bh, &new_cpos); | |
1506 | if (ret) { | |
1507 | mlog_errno(ret); | |
1508 | goto out; | |
1509 | } | |
1510 | ||
1511 | ocfs2_journal_dirty(handle, ref_leaf_bh); | |
1512 | ocfs2_journal_dirty(handle, new_bh); | |
1513 | ||
1514 | ocfs2_init_refcount_extent_tree(&ref_et, ci, ref_root_bh); | |
1515 | ||
1516 | mlog(0, "insert new leaf block %llu at %u\n", | |
1517 | (unsigned long long)new_bh->b_blocknr, new_cpos); | |
1518 | ||
1519 | /* Insert the new leaf block with the specific offset cpos. */ | |
1520 | ret = ocfs2_insert_extent(handle, &ref_et, new_cpos, new_bh->b_blocknr, | |
1521 | 1, 0, meta_ac); | |
1522 | if (ret) | |
1523 | mlog_errno(ret); | |
1524 | ||
1525 | out: | |
1526 | brelse(new_bh); | |
1527 | return ret; | |
1528 | } | |
1529 | ||
1530 | static int ocfs2_expand_refcount_tree(handle_t *handle, | |
1531 | struct ocfs2_caching_info *ci, | |
1532 | struct buffer_head *ref_root_bh, | |
1533 | struct buffer_head *ref_leaf_bh, | |
1534 | struct ocfs2_alloc_context *meta_ac) | |
1535 | { | |
1536 | int ret; | |
1537 | struct buffer_head *expand_bh = NULL; | |
1538 | ||
1539 | if (ref_root_bh == ref_leaf_bh) { | |
1540 | /* | |
1541 | * the old root bh hasn't been expanded to a b-tree, | |
1542 | * so expand it first. | |
1543 | */ | |
1544 | ret = ocfs2_expand_inline_ref_root(handle, ci, ref_root_bh, | |
1545 | &expand_bh, meta_ac); | |
1546 | if (ret) { | |
1547 | mlog_errno(ret); | |
1548 | goto out; | |
1549 | } | |
1550 | } else { | |
1551 | expand_bh = ref_leaf_bh; | |
1552 | get_bh(expand_bh); | |
1553 | } | |
1554 | ||
1555 | ||
1556 | /* Now add a new refcount block into the tree.*/ | |
1557 | ret = ocfs2_new_leaf_refcount_block(handle, ci, ref_root_bh, | |
1558 | expand_bh, meta_ac); | |
1559 | if (ret) | |
1560 | mlog_errno(ret); | |
1561 | out: | |
1562 | brelse(expand_bh); | |
1563 | return ret; | |
1564 | } | |
1565 | ||
1566 | /* | |
1567 | * Adjust the extent rec in b-tree representing ref_leaf_bh. | |
1568 | * | |
1569 | * Only called when we have inserted a new refcount rec at index 0 | |
1570 | * which means ocfs2_extent_rec.e_cpos may need some change. | |
1571 | */ | |
1572 | static int ocfs2_adjust_refcount_rec(handle_t *handle, | |
1573 | struct ocfs2_caching_info *ci, | |
1574 | struct buffer_head *ref_root_bh, | |
1575 | struct buffer_head *ref_leaf_bh, | |
1576 | struct ocfs2_refcount_rec *rec) | |
1577 | { | |
1578 | int ret = 0, i; | |
1579 | u32 new_cpos, old_cpos; | |
1580 | struct ocfs2_path *path = NULL; | |
1581 | struct ocfs2_extent_tree et; | |
1582 | struct ocfs2_refcount_block *rb = | |
1583 | (struct ocfs2_refcount_block *)ref_root_bh->b_data; | |
1584 | struct ocfs2_extent_list *el; | |
1585 | ||
1586 | if (!(le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL)) | |
1587 | goto out; | |
1588 | ||
1589 | rb = (struct ocfs2_refcount_block *)ref_leaf_bh->b_data; | |
1590 | old_cpos = le32_to_cpu(rb->rf_cpos); | |
1591 | new_cpos = le64_to_cpu(rec->r_cpos) & OCFS2_32BIT_POS_MASK; | |
1592 | if (old_cpos <= new_cpos) | |
1593 | goto out; | |
1594 | ||
1595 | ocfs2_init_refcount_extent_tree(&et, ci, ref_root_bh); | |
1596 | ||
1597 | path = ocfs2_new_path_from_et(&et); | |
1598 | if (!path) { | |
1599 | ret = -ENOMEM; | |
1600 | mlog_errno(ret); | |
1601 | goto out; | |
1602 | } | |
1603 | ||
1604 | ret = ocfs2_find_path(ci, path, old_cpos); | |
1605 | if (ret) { | |
1606 | mlog_errno(ret); | |
1607 | goto out; | |
1608 | } | |
1609 | ||
1610 | /* | |
1611 | * 2 more credits, one for the leaf refcount block, one for | |
1612 | * the extent block contains the extent rec. | |
1613 | */ | |
1614 | ret = ocfs2_extend_trans(handle, handle->h_buffer_credits + 2); | |
1615 | if (ret < 0) { | |
1616 | mlog_errno(ret); | |
1617 | goto out; | |
1618 | } | |
1619 | ||
1620 | ret = ocfs2_journal_access_rb(handle, ci, ref_leaf_bh, | |
1621 | OCFS2_JOURNAL_ACCESS_WRITE); | |
1622 | if (ret < 0) { | |
1623 | mlog_errno(ret); | |
1624 | goto out; | |
1625 | } | |
1626 | ||
1627 | ret = ocfs2_journal_access_eb(handle, ci, path_leaf_bh(path), | |
1628 | OCFS2_JOURNAL_ACCESS_WRITE); | |
1629 | if (ret < 0) { | |
1630 | mlog_errno(ret); | |
1631 | goto out; | |
1632 | } | |
1633 | ||
1634 | /* change the leaf extent block first. */ | |
1635 | el = path_leaf_el(path); | |
1636 | ||
1637 | for (i = 0; i < le16_to_cpu(el->l_next_free_rec); i++) | |
1638 | if (le32_to_cpu(el->l_recs[i].e_cpos) == old_cpos) | |
1639 | break; | |
1640 | ||
1641 | BUG_ON(i == le16_to_cpu(el->l_next_free_rec)); | |
1642 | ||
1643 | el->l_recs[i].e_cpos = cpu_to_le32(new_cpos); | |
1644 | ||
1645 | /* change the r_cpos in the leaf block. */ | |
1646 | rb->rf_cpos = cpu_to_le32(new_cpos); | |
1647 | ||
1648 | ocfs2_journal_dirty(handle, path_leaf_bh(path)); | |
1649 | ocfs2_journal_dirty(handle, ref_leaf_bh); | |
1650 | ||
1651 | out: | |
1652 | ocfs2_free_path(path); | |
1653 | return ret; | |
1654 | } | |
1655 | ||
1656 | static int ocfs2_insert_refcount_rec(handle_t *handle, | |
1657 | struct ocfs2_caching_info *ci, | |
1658 | struct buffer_head *ref_root_bh, | |
1659 | struct buffer_head *ref_leaf_bh, | |
1660 | struct ocfs2_refcount_rec *rec, | |
7540c1a7 | 1661 | int index, int merge, |
e73a819d TM |
1662 | struct ocfs2_alloc_context *meta_ac) |
1663 | { | |
1664 | int ret; | |
1665 | struct ocfs2_refcount_block *rb = | |
1666 | (struct ocfs2_refcount_block *)ref_leaf_bh->b_data; | |
1667 | struct ocfs2_refcount_list *rf_list = &rb->rf_records; | |
1668 | struct buffer_head *new_bh = NULL; | |
1669 | ||
1670 | BUG_ON(le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL); | |
1671 | ||
1672 | if (rf_list->rl_used == rf_list->rl_count) { | |
1673 | u64 cpos = le64_to_cpu(rec->r_cpos); | |
1674 | u32 len = le32_to_cpu(rec->r_clusters); | |
1675 | ||
1676 | ret = ocfs2_expand_refcount_tree(handle, ci, ref_root_bh, | |
1677 | ref_leaf_bh, meta_ac); | |
1678 | if (ret) { | |
1679 | mlog_errno(ret); | |
1680 | goto out; | |
1681 | } | |
1682 | ||
1683 | ret = ocfs2_get_refcount_rec(ci, ref_root_bh, | |
1684 | cpos, len, NULL, &index, | |
1685 | &new_bh); | |
1686 | if (ret) { | |
1687 | mlog_errno(ret); | |
1688 | goto out; | |
1689 | } | |
1690 | ||
1691 | ref_leaf_bh = new_bh; | |
1692 | rb = (struct ocfs2_refcount_block *)ref_leaf_bh->b_data; | |
1693 | rf_list = &rb->rf_records; | |
1694 | } | |
1695 | ||
1696 | ret = ocfs2_journal_access_rb(handle, ci, ref_leaf_bh, | |
1697 | OCFS2_JOURNAL_ACCESS_WRITE); | |
1698 | if (ret) { | |
1699 | mlog_errno(ret); | |
1700 | goto out; | |
1701 | } | |
1702 | ||
1703 | if (index < le16_to_cpu(rf_list->rl_used)) | |
1704 | memmove(&rf_list->rl_recs[index + 1], | |
1705 | &rf_list->rl_recs[index], | |
1706 | (le16_to_cpu(rf_list->rl_used) - index) * | |
1707 | sizeof(struct ocfs2_refcount_rec)); | |
1708 | ||
1709 | mlog(0, "insert refcount record start %llu, len %u, count %u " | |
1710 | "to leaf block %llu at index %d\n", | |
1711 | (unsigned long long)le64_to_cpu(rec->r_cpos), | |
1712 | le32_to_cpu(rec->r_clusters), le32_to_cpu(rec->r_refcount), | |
1713 | (unsigned long long)ref_leaf_bh->b_blocknr, index); | |
1714 | ||
1715 | rf_list->rl_recs[index] = *rec; | |
1716 | ||
1717 | le16_add_cpu(&rf_list->rl_used, 1); | |
1718 | ||
7540c1a7 TM |
1719 | if (merge) |
1720 | ocfs2_refcount_rec_merge(rb, index); | |
e73a819d TM |
1721 | |
1722 | ret = ocfs2_journal_dirty(handle, ref_leaf_bh); | |
1723 | if (ret) { | |
1724 | mlog_errno(ret); | |
1725 | goto out; | |
1726 | } | |
1727 | ||
1728 | if (index == 0) { | |
1729 | ret = ocfs2_adjust_refcount_rec(handle, ci, | |
1730 | ref_root_bh, | |
1731 | ref_leaf_bh, rec); | |
1732 | if (ret) | |
1733 | mlog_errno(ret); | |
1734 | } | |
1735 | out: | |
1736 | brelse(new_bh); | |
1737 | return ret; | |
1738 | } | |
1739 | ||
1740 | /* | |
1741 | * Split the refcount_rec indexed by "index" in ref_leaf_bh. | |
1742 | * This is much simple than our b-tree code. | |
1743 | * split_rec is the new refcount rec we want to insert. | |
1744 | * If split_rec->r_refcount > 0, we are changing the refcount(in case we | |
1745 | * increase refcount or decrease a refcount to non-zero). | |
1746 | * If split_rec->r_refcount == 0, we are punching a hole in current refcount | |
1747 | * rec( in case we decrease a refcount to zero). | |
1748 | */ | |
1749 | static int ocfs2_split_refcount_rec(handle_t *handle, | |
1750 | struct ocfs2_caching_info *ci, | |
1751 | struct buffer_head *ref_root_bh, | |
1752 | struct buffer_head *ref_leaf_bh, | |
1753 | struct ocfs2_refcount_rec *split_rec, | |
7540c1a7 | 1754 | int index, int merge, |
e73a819d TM |
1755 | struct ocfs2_alloc_context *meta_ac, |
1756 | struct ocfs2_cached_dealloc_ctxt *dealloc) | |
1757 | { | |
1758 | int ret, recs_need; | |
1759 | u32 len; | |
1760 | struct ocfs2_refcount_block *rb = | |
1761 | (struct ocfs2_refcount_block *)ref_leaf_bh->b_data; | |
1762 | struct ocfs2_refcount_list *rf_list = &rb->rf_records; | |
1763 | struct ocfs2_refcount_rec *orig_rec = &rf_list->rl_recs[index]; | |
1764 | struct ocfs2_refcount_rec *tail_rec = NULL; | |
1765 | struct buffer_head *new_bh = NULL; | |
1766 | ||
1767 | BUG_ON(le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL); | |
1768 | ||
1769 | mlog(0, "original r_pos %llu, cluster %u, split %llu, cluster %u\n", | |
1770 | le64_to_cpu(orig_rec->r_cpos), le32_to_cpu(orig_rec->r_clusters), | |
1771 | le64_to_cpu(split_rec->r_cpos), | |
1772 | le32_to_cpu(split_rec->r_clusters)); | |
1773 | ||
1774 | /* | |
1775 | * If we just need to split the header or tail clusters, | |
1776 | * no more recs are needed, just split is OK. | |
1777 | * Otherwise we at least need one new recs. | |
1778 | */ | |
1779 | if (!split_rec->r_refcount && | |
1780 | (split_rec->r_cpos == orig_rec->r_cpos || | |
1781 | le64_to_cpu(split_rec->r_cpos) + | |
1782 | le32_to_cpu(split_rec->r_clusters) == | |
1783 | le64_to_cpu(orig_rec->r_cpos) + le32_to_cpu(orig_rec->r_clusters))) | |
1784 | recs_need = 0; | |
1785 | else | |
1786 | recs_need = 1; | |
1787 | ||
1788 | /* | |
1789 | * We need one more rec if we split in the middle and the new rec have | |
1790 | * some refcount in it. | |
1791 | */ | |
1792 | if (split_rec->r_refcount && | |
1793 | (split_rec->r_cpos != orig_rec->r_cpos && | |
1794 | le64_to_cpu(split_rec->r_cpos) + | |
1795 | le32_to_cpu(split_rec->r_clusters) != | |
1796 | le64_to_cpu(orig_rec->r_cpos) + le32_to_cpu(orig_rec->r_clusters))) | |
1797 | recs_need++; | |
1798 | ||
1799 | /* If the leaf block don't have enough record, expand it. */ | |
1800 | if (le16_to_cpu(rf_list->rl_used) + recs_need > rf_list->rl_count) { | |
1801 | struct ocfs2_refcount_rec tmp_rec; | |
1802 | u64 cpos = le64_to_cpu(orig_rec->r_cpos); | |
1803 | len = le32_to_cpu(orig_rec->r_clusters); | |
1804 | ret = ocfs2_expand_refcount_tree(handle, ci, ref_root_bh, | |
1805 | ref_leaf_bh, meta_ac); | |
1806 | if (ret) { | |
1807 | mlog_errno(ret); | |
1808 | goto out; | |
1809 | } | |
1810 | ||
1811 | /* | |
1812 | * We have to re-get it since now cpos may be moved to | |
1813 | * another leaf block. | |
1814 | */ | |
1815 | ret = ocfs2_get_refcount_rec(ci, ref_root_bh, | |
1816 | cpos, len, &tmp_rec, &index, | |
1817 | &new_bh); | |
1818 | if (ret) { | |
1819 | mlog_errno(ret); | |
1820 | goto out; | |
1821 | } | |
1822 | ||
1823 | ref_leaf_bh = new_bh; | |
1824 | rb = (struct ocfs2_refcount_block *)ref_leaf_bh->b_data; | |
1825 | rf_list = &rb->rf_records; | |
1826 | orig_rec = &rf_list->rl_recs[index]; | |
1827 | } | |
1828 | ||
1829 | ret = ocfs2_journal_access_rb(handle, ci, ref_leaf_bh, | |
1830 | OCFS2_JOURNAL_ACCESS_WRITE); | |
1831 | if (ret) { | |
1832 | mlog_errno(ret); | |
1833 | goto out; | |
1834 | } | |
1835 | ||
1836 | /* | |
1837 | * We have calculated out how many new records we need and store | |
1838 | * in recs_need, so spare enough space first by moving the records | |
1839 | * after "index" to the end. | |
1840 | */ | |
1841 | if (index != le16_to_cpu(rf_list->rl_used) - 1) | |
1842 | memmove(&rf_list->rl_recs[index + 1 + recs_need], | |
1843 | &rf_list->rl_recs[index + 1], | |
1844 | (le16_to_cpu(rf_list->rl_used) - index - 1) * | |
1845 | sizeof(struct ocfs2_refcount_rec)); | |
1846 | ||
1847 | len = (le64_to_cpu(orig_rec->r_cpos) + | |
1848 | le32_to_cpu(orig_rec->r_clusters)) - | |
1849 | (le64_to_cpu(split_rec->r_cpos) + | |
1850 | le32_to_cpu(split_rec->r_clusters)); | |
1851 | ||
1852 | /* | |
1853 | * If we have "len", the we will split in the tail and move it | |
1854 | * to the end of the space we have just spared. | |
1855 | */ | |
1856 | if (len) { | |
1857 | tail_rec = &rf_list->rl_recs[index + recs_need]; | |
1858 | ||
1859 | memcpy(tail_rec, orig_rec, sizeof(struct ocfs2_refcount_rec)); | |
1860 | le64_add_cpu(&tail_rec->r_cpos, | |
1861 | le32_to_cpu(tail_rec->r_clusters) - len); | |
1862 | tail_rec->r_clusters = le32_to_cpu(len); | |
1863 | } | |
1864 | ||
1865 | /* | |
1866 | * If the split pos isn't the same as the original one, we need to | |
1867 | * split in the head. | |
1868 | * | |
1869 | * Note: We have the chance that split_rec.r_refcount = 0, | |
1870 | * recs_need = 0 and len > 0, which means we just cut the head from | |
1871 | * the orig_rec and in that case we have done some modification in | |
1872 | * orig_rec above, so the check for r_cpos is faked. | |
1873 | */ | |
1874 | if (split_rec->r_cpos != orig_rec->r_cpos && tail_rec != orig_rec) { | |
1875 | len = le64_to_cpu(split_rec->r_cpos) - | |
1876 | le64_to_cpu(orig_rec->r_cpos); | |
1877 | orig_rec->r_clusters = cpu_to_le32(len); | |
1878 | index++; | |
1879 | } | |
1880 | ||
1881 | le16_add_cpu(&rf_list->rl_used, recs_need); | |
1882 | ||
1883 | if (split_rec->r_refcount) { | |
1884 | rf_list->rl_recs[index] = *split_rec; | |
1885 | mlog(0, "insert refcount record start %llu, len %u, count %u " | |
1886 | "to leaf block %llu at index %d\n", | |
1887 | (unsigned long long)le64_to_cpu(split_rec->r_cpos), | |
1888 | le32_to_cpu(split_rec->r_clusters), | |
1889 | le32_to_cpu(split_rec->r_refcount), | |
1890 | (unsigned long long)ref_leaf_bh->b_blocknr, index); | |
1891 | ||
7540c1a7 TM |
1892 | if (merge) |
1893 | ocfs2_refcount_rec_merge(rb, index); | |
e73a819d TM |
1894 | } |
1895 | ||
1896 | ret = ocfs2_journal_dirty(handle, ref_leaf_bh); | |
1897 | if (ret) | |
1898 | mlog_errno(ret); | |
1899 | ||
1900 | out: | |
1901 | brelse(new_bh); | |
1902 | return ret; | |
1903 | } | |
1904 | ||
7540c1a7 TM |
1905 | static int __ocfs2_increase_refcount(handle_t *handle, |
1906 | struct ocfs2_caching_info *ci, | |
1907 | struct buffer_head *ref_root_bh, | |
1908 | u64 cpos, u32 len, int merge, | |
1909 | struct ocfs2_alloc_context *meta_ac, | |
1910 | struct ocfs2_cached_dealloc_ctxt *dealloc) | |
e73a819d TM |
1911 | { |
1912 | int ret = 0, index; | |
1913 | struct buffer_head *ref_leaf_bh = NULL; | |
1914 | struct ocfs2_refcount_rec rec; | |
1915 | unsigned int set_len = 0; | |
1916 | ||
1917 | mlog(0, "Tree owner %llu, add refcount start %llu, len %u\n", | |
1918 | (unsigned long long)ocfs2_metadata_cache_owner(ci), | |
1919 | (unsigned long long)cpos, len); | |
1920 | ||
1921 | while (len) { | |
1922 | ret = ocfs2_get_refcount_rec(ci, ref_root_bh, | |
1923 | cpos, len, &rec, &index, | |
1924 | &ref_leaf_bh); | |
1925 | if (ret) { | |
1926 | mlog_errno(ret); | |
1927 | goto out; | |
1928 | } | |
1929 | ||
1930 | set_len = le32_to_cpu(rec.r_clusters); | |
1931 | ||
1932 | /* | |
1933 | * Here we may meet with 3 situations: | |
1934 | * | |
1935 | * 1. If we find an already existing record, and the length | |
1936 | * is the same, cool, we just need to increase the r_refcount | |
1937 | * and it is OK. | |
1938 | * 2. If we find a hole, just insert it with r_refcount = 1. | |
1939 | * 3. If we are in the middle of one extent record, split | |
1940 | * it. | |
1941 | */ | |
1942 | if (rec.r_refcount && le64_to_cpu(rec.r_cpos) == cpos && | |
1943 | set_len <= len) { | |
1944 | mlog(0, "increase refcount rec, start %llu, len %u, " | |
1945 | "count %u\n", (unsigned long long)cpos, set_len, | |
1946 | le32_to_cpu(rec.r_refcount)); | |
1947 | ret = ocfs2_change_refcount_rec(handle, ci, | |
7540c1a7 TM |
1948 | ref_leaf_bh, index, |
1949 | merge, 1); | |
e73a819d TM |
1950 | if (ret) { |
1951 | mlog_errno(ret); | |
1952 | goto out; | |
1953 | } | |
1954 | } else if (!rec.r_refcount) { | |
1955 | rec.r_refcount = cpu_to_le32(1); | |
1956 | ||
1957 | mlog(0, "insert refcount rec, start %llu, len %u\n", | |
1958 | (unsigned long long)le64_to_cpu(rec.r_cpos), | |
1959 | set_len); | |
1960 | ret = ocfs2_insert_refcount_rec(handle, ci, ref_root_bh, | |
1961 | ref_leaf_bh, | |
7540c1a7 TM |
1962 | &rec, index, |
1963 | merge, meta_ac); | |
e73a819d TM |
1964 | if (ret) { |
1965 | mlog_errno(ret); | |
1966 | goto out; | |
1967 | } | |
1968 | } else { | |
1969 | set_len = min((u64)(cpos + len), | |
1970 | le64_to_cpu(rec.r_cpos) + set_len) - cpos; | |
1971 | rec.r_cpos = cpu_to_le64(cpos); | |
1972 | rec.r_clusters = cpu_to_le32(set_len); | |
1973 | le32_add_cpu(&rec.r_refcount, 1); | |
1974 | ||
1975 | mlog(0, "split refcount rec, start %llu, " | |
1976 | "len %u, count %u\n", | |
1977 | (unsigned long long)le64_to_cpu(rec.r_cpos), | |
1978 | set_len, le32_to_cpu(rec.r_refcount)); | |
1979 | ret = ocfs2_split_refcount_rec(handle, ci, | |
1980 | ref_root_bh, ref_leaf_bh, | |
7540c1a7 | 1981 | &rec, index, merge, |
e73a819d TM |
1982 | meta_ac, dealloc); |
1983 | if (ret) { | |
1984 | mlog_errno(ret); | |
1985 | goto out; | |
1986 | } | |
1987 | } | |
1988 | ||
1989 | cpos += set_len; | |
1990 | len -= set_len; | |
1991 | brelse(ref_leaf_bh); | |
1992 | ref_leaf_bh = NULL; | |
1993 | } | |
1994 | ||
1995 | out: | |
1996 | brelse(ref_leaf_bh); | |
1997 | return ret; | |
1998 | } | |
1823cb0b TM |
1999 | |
2000 | static int ocfs2_remove_refcount_extent(handle_t *handle, | |
2001 | struct ocfs2_caching_info *ci, | |
2002 | struct buffer_head *ref_root_bh, | |
2003 | struct buffer_head *ref_leaf_bh, | |
2004 | struct ocfs2_alloc_context *meta_ac, | |
2005 | struct ocfs2_cached_dealloc_ctxt *dealloc) | |
2006 | { | |
2007 | int ret; | |
2008 | struct super_block *sb = ocfs2_metadata_cache_get_super(ci); | |
2009 | struct ocfs2_refcount_block *rb = | |
2010 | (struct ocfs2_refcount_block *)ref_leaf_bh->b_data; | |
2011 | struct ocfs2_extent_tree et; | |
2012 | ||
2013 | BUG_ON(rb->rf_records.rl_used); | |
2014 | ||
2015 | ocfs2_init_refcount_extent_tree(&et, ci, ref_root_bh); | |
2016 | ret = ocfs2_remove_extent(handle, &et, le32_to_cpu(rb->rf_cpos), | |
2017 | 1, meta_ac, dealloc); | |
2018 | if (ret) { | |
2019 | mlog_errno(ret); | |
2020 | goto out; | |
2021 | } | |
2022 | ||
2023 | ocfs2_remove_from_cache(ci, ref_leaf_bh); | |
2024 | ||
2025 | /* | |
2026 | * add the freed block to the dealloc so that it will be freed | |
2027 | * when we run dealloc. | |
2028 | */ | |
2029 | ret = ocfs2_cache_block_dealloc(dealloc, EXTENT_ALLOC_SYSTEM_INODE, | |
2030 | le16_to_cpu(rb->rf_suballoc_slot), | |
2031 | le64_to_cpu(rb->rf_blkno), | |
2032 | le16_to_cpu(rb->rf_suballoc_bit)); | |
2033 | if (ret) { | |
2034 | mlog_errno(ret); | |
2035 | goto out; | |
2036 | } | |
2037 | ||
2038 | ret = ocfs2_journal_access_rb(handle, ci, ref_root_bh, | |
2039 | OCFS2_JOURNAL_ACCESS_WRITE); | |
2040 | if (ret) { | |
2041 | mlog_errno(ret); | |
2042 | goto out; | |
2043 | } | |
2044 | ||
2045 | rb = (struct ocfs2_refcount_block *)ref_root_bh->b_data; | |
2046 | ||
2047 | le32_add_cpu(&rb->rf_clusters, -1); | |
2048 | ||
2049 | /* | |
2050 | * check whether we need to restore the root refcount block if | |
2051 | * there is no leaf extent block at atll. | |
2052 | */ | |
2053 | if (!rb->rf_list.l_next_free_rec) { | |
2054 | BUG_ON(rb->rf_clusters); | |
2055 | ||
2056 | mlog(0, "reset refcount tree root %llu to be a record block.\n", | |
2057 | (unsigned long long)ref_root_bh->b_blocknr); | |
2058 | ||
2059 | rb->rf_flags = 0; | |
2060 | rb->rf_parent = 0; | |
2061 | rb->rf_cpos = 0; | |
2062 | memset(&rb->rf_records, 0, sb->s_blocksize - | |
2063 | offsetof(struct ocfs2_refcount_block, rf_records)); | |
2064 | rb->rf_records.rl_count = | |
2065 | cpu_to_le16(ocfs2_refcount_recs_per_rb(sb)); | |
2066 | } | |
2067 | ||
2068 | ocfs2_journal_dirty(handle, ref_root_bh); | |
2069 | ||
2070 | out: | |
2071 | return ret; | |
2072 | } | |
2073 | ||
7540c1a7 TM |
2074 | int ocfs2_increase_refcount(handle_t *handle, |
2075 | struct ocfs2_caching_info *ci, | |
2076 | struct buffer_head *ref_root_bh, | |
2077 | u64 cpos, u32 len, | |
2078 | struct ocfs2_alloc_context *meta_ac, | |
2079 | struct ocfs2_cached_dealloc_ctxt *dealloc) | |
2080 | { | |
2081 | return __ocfs2_increase_refcount(handle, ci, ref_root_bh, | |
2082 | cpos, len, 1, | |
2083 | meta_ac, dealloc); | |
2084 | } | |
2085 | ||
1823cb0b TM |
2086 | static int ocfs2_decrease_refcount_rec(handle_t *handle, |
2087 | struct ocfs2_caching_info *ci, | |
2088 | struct buffer_head *ref_root_bh, | |
2089 | struct buffer_head *ref_leaf_bh, | |
2090 | int index, u64 cpos, unsigned int len, | |
2091 | struct ocfs2_alloc_context *meta_ac, | |
2092 | struct ocfs2_cached_dealloc_ctxt *dealloc) | |
2093 | { | |
2094 | int ret; | |
2095 | struct ocfs2_refcount_block *rb = | |
2096 | (struct ocfs2_refcount_block *)ref_leaf_bh->b_data; | |
2097 | struct ocfs2_refcount_rec *rec = &rb->rf_records.rl_recs[index]; | |
2098 | ||
2099 | BUG_ON(cpos < le64_to_cpu(rec->r_cpos)); | |
2100 | BUG_ON(cpos + len > | |
2101 | le64_to_cpu(rec->r_cpos) + le32_to_cpu(rec->r_clusters)); | |
2102 | ||
2103 | if (cpos == le64_to_cpu(rec->r_cpos) && | |
2104 | len == le32_to_cpu(rec->r_clusters)) | |
2105 | ret = ocfs2_change_refcount_rec(handle, ci, | |
7540c1a7 | 2106 | ref_leaf_bh, index, 1, -1); |
1823cb0b TM |
2107 | else { |
2108 | struct ocfs2_refcount_rec split = *rec; | |
2109 | split.r_cpos = cpu_to_le64(cpos); | |
2110 | split.r_clusters = cpu_to_le32(len); | |
2111 | ||
2112 | le32_add_cpu(&split.r_refcount, -1); | |
2113 | ||
2114 | mlog(0, "split refcount rec, start %llu, " | |
2115 | "len %u, count %u, original start %llu, len %u\n", | |
2116 | (unsigned long long)le64_to_cpu(split.r_cpos), | |
2117 | len, le32_to_cpu(split.r_refcount), | |
2118 | (unsigned long long)le64_to_cpu(rec->r_cpos), | |
2119 | le32_to_cpu(rec->r_clusters)); | |
2120 | ret = ocfs2_split_refcount_rec(handle, ci, | |
2121 | ref_root_bh, ref_leaf_bh, | |
7540c1a7 | 2122 | &split, index, 1, |
1823cb0b TM |
2123 | meta_ac, dealloc); |
2124 | } | |
2125 | ||
2126 | if (ret) { | |
2127 | mlog_errno(ret); | |
2128 | goto out; | |
2129 | } | |
2130 | ||
2131 | /* Remove the leaf refcount block if it contains no refcount record. */ | |
2132 | if (!rb->rf_records.rl_used && ref_leaf_bh != ref_root_bh) { | |
2133 | ret = ocfs2_remove_refcount_extent(handle, ci, ref_root_bh, | |
2134 | ref_leaf_bh, meta_ac, | |
2135 | dealloc); | |
2136 | if (ret) | |
2137 | mlog_errno(ret); | |
2138 | } | |
2139 | ||
2140 | out: | |
2141 | return ret; | |
2142 | } | |
2143 | ||
2144 | static int __ocfs2_decrease_refcount(handle_t *handle, | |
2145 | struct ocfs2_caching_info *ci, | |
2146 | struct buffer_head *ref_root_bh, | |
2147 | u64 cpos, u32 len, | |
2148 | struct ocfs2_alloc_context *meta_ac, | |
6ae23c55 TM |
2149 | struct ocfs2_cached_dealloc_ctxt *dealloc, |
2150 | int delete) | |
1823cb0b TM |
2151 | { |
2152 | int ret = 0, index = 0; | |
2153 | struct ocfs2_refcount_rec rec; | |
2154 | unsigned int r_count = 0, r_len; | |
2155 | struct super_block *sb = ocfs2_metadata_cache_get_super(ci); | |
2156 | struct buffer_head *ref_leaf_bh = NULL; | |
2157 | ||
6ae23c55 TM |
2158 | mlog(0, "Tree owner %llu, decrease refcount start %llu, " |
2159 | "len %u, delete %u\n", | |
1823cb0b | 2160 | (unsigned long long)ocfs2_metadata_cache_owner(ci), |
6ae23c55 | 2161 | (unsigned long long)cpos, len, delete); |
1823cb0b TM |
2162 | |
2163 | while (len) { | |
2164 | ret = ocfs2_get_refcount_rec(ci, ref_root_bh, | |
2165 | cpos, len, &rec, &index, | |
2166 | &ref_leaf_bh); | |
2167 | if (ret) { | |
2168 | mlog_errno(ret); | |
2169 | goto out; | |
2170 | } | |
2171 | ||
2172 | r_count = le32_to_cpu(rec.r_refcount); | |
2173 | BUG_ON(r_count == 0); | |
6ae23c55 TM |
2174 | if (!delete) |
2175 | BUG_ON(r_count > 1); | |
1823cb0b TM |
2176 | |
2177 | r_len = min((u64)(cpos + len), le64_to_cpu(rec.r_cpos) + | |
2178 | le32_to_cpu(rec.r_clusters)) - cpos; | |
2179 | ||
2180 | ret = ocfs2_decrease_refcount_rec(handle, ci, ref_root_bh, | |
2181 | ref_leaf_bh, index, | |
2182 | cpos, r_len, | |
2183 | meta_ac, dealloc); | |
2184 | if (ret) { | |
2185 | mlog_errno(ret); | |
2186 | goto out; | |
2187 | } | |
2188 | ||
6ae23c55 | 2189 | if (le32_to_cpu(rec.r_refcount) == 1 && delete) { |
1823cb0b TM |
2190 | ret = ocfs2_cache_cluster_dealloc(dealloc, |
2191 | ocfs2_clusters_to_blocks(sb, cpos), | |
2192 | r_len); | |
2193 | if (ret) { | |
2194 | mlog_errno(ret); | |
2195 | goto out; | |
2196 | } | |
2197 | } | |
2198 | ||
2199 | cpos += r_len; | |
2200 | len -= r_len; | |
2201 | brelse(ref_leaf_bh); | |
2202 | ref_leaf_bh = NULL; | |
2203 | } | |
2204 | ||
2205 | out: | |
2206 | brelse(ref_leaf_bh); | |
2207 | return ret; | |
2208 | } | |
2209 | ||
2210 | /* Caller must hold refcount tree lock. */ | |
2211 | int ocfs2_decrease_refcount(struct inode *inode, | |
2212 | handle_t *handle, u32 cpos, u32 len, | |
2213 | struct ocfs2_alloc_context *meta_ac, | |
6ae23c55 TM |
2214 | struct ocfs2_cached_dealloc_ctxt *dealloc, |
2215 | int delete) | |
1823cb0b TM |
2216 | { |
2217 | int ret; | |
2218 | u64 ref_blkno; | |
2219 | struct ocfs2_inode_info *oi = OCFS2_I(inode); | |
2220 | struct buffer_head *ref_root_bh = NULL; | |
2221 | struct ocfs2_refcount_tree *tree; | |
2222 | ||
2223 | BUG_ON(!(oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL)); | |
2224 | ||
2225 | ret = ocfs2_get_refcount_block(inode, &ref_blkno); | |
2226 | if (ret) { | |
2227 | mlog_errno(ret); | |
2228 | goto out; | |
2229 | } | |
2230 | ||
2231 | ret = ocfs2_get_refcount_tree(OCFS2_SB(inode->i_sb), ref_blkno, &tree); | |
2232 | if (ret) { | |
2233 | mlog_errno(ret); | |
2234 | goto out; | |
2235 | } | |
2236 | ||
2237 | ret = ocfs2_read_refcount_block(&tree->rf_ci, tree->rf_blkno, | |
2238 | &ref_root_bh); | |
2239 | if (ret) { | |
2240 | mlog_errno(ret); | |
2241 | goto out; | |
2242 | } | |
2243 | ||
2244 | ret = __ocfs2_decrease_refcount(handle, &tree->rf_ci, ref_root_bh, | |
6ae23c55 | 2245 | cpos, len, meta_ac, dealloc, delete); |
1823cb0b TM |
2246 | if (ret) |
2247 | mlog_errno(ret); | |
2248 | out: | |
2249 | brelse(ref_root_bh); | |
2250 | return ret; | |
2251 | } | |
1aa75fea TM |
2252 | |
2253 | /* | |
2254 | * Mark the already-existing extent at cpos as refcounted for len clusters. | |
2255 | * This adds the refcount extent flag. | |
2256 | * | |
2257 | * If the existing extent is larger than the request, initiate a | |
2258 | * split. An attempt will be made at merging with adjacent extents. | |
2259 | * | |
2260 | * The caller is responsible for passing down meta_ac if we'll need it. | |
2261 | */ | |
2262 | static int ocfs2_mark_extent_refcounted(struct inode *inode, | |
2263 | struct ocfs2_extent_tree *et, | |
2264 | handle_t *handle, u32 cpos, | |
2265 | u32 len, u32 phys, | |
2266 | struct ocfs2_alloc_context *meta_ac, | |
2267 | struct ocfs2_cached_dealloc_ctxt *dealloc) | |
2268 | { | |
2269 | int ret; | |
2270 | ||
2271 | mlog(0, "Inode %lu refcount tree cpos %u, len %u, phys cluster %u\n", | |
2272 | inode->i_ino, cpos, len, phys); | |
2273 | ||
2274 | if (!ocfs2_refcount_tree(OCFS2_SB(inode->i_sb))) { | |
2275 | ocfs2_error(inode->i_sb, "Inode %lu want to use refcount " | |
2276 | "tree, but the feature bit is not set in the " | |
2277 | "super block.", inode->i_ino); | |
2278 | ret = -EROFS; | |
2279 | goto out; | |
2280 | } | |
2281 | ||
2282 | ret = ocfs2_change_extent_flag(handle, et, cpos, | |
2283 | len, phys, meta_ac, dealloc, | |
2284 | OCFS2_EXT_REFCOUNTED, 0); | |
2285 | if (ret) | |
2286 | mlog_errno(ret); | |
2287 | ||
2288 | out: | |
2289 | return ret; | |
2290 | } | |
bcbbb24a TM |
2291 | |
2292 | /* | |
2293 | * Given some contiguous physical clusters, calculate what we need | |
2294 | * for modifying their refcount. | |
2295 | */ | |
2296 | static int ocfs2_calc_refcount_meta_credits(struct super_block *sb, | |
2297 | struct ocfs2_caching_info *ci, | |
2298 | struct buffer_head *ref_root_bh, | |
2299 | u64 start_cpos, | |
2300 | u32 clusters, | |
2301 | int *meta_add, | |
2302 | int *credits) | |
2303 | { | |
2304 | int ret = 0, index, ref_blocks = 0, recs_add = 0; | |
2305 | u64 cpos = start_cpos; | |
2306 | struct ocfs2_refcount_block *rb; | |
2307 | struct ocfs2_refcount_rec rec; | |
2308 | struct buffer_head *ref_leaf_bh = NULL, *prev_bh = NULL; | |
2309 | u32 len; | |
2310 | ||
2311 | mlog(0, "start_cpos %llu, clusters %u\n", | |
2312 | (unsigned long long)start_cpos, clusters); | |
2313 | while (clusters) { | |
2314 | ret = ocfs2_get_refcount_rec(ci, ref_root_bh, | |
2315 | cpos, clusters, &rec, | |
2316 | &index, &ref_leaf_bh); | |
2317 | if (ret) { | |
2318 | mlog_errno(ret); | |
2319 | goto out; | |
2320 | } | |
2321 | ||
2322 | if (ref_leaf_bh != prev_bh) { | |
2323 | /* | |
2324 | * Now we encounter a new leaf block, so calculate | |
2325 | * whether we need to extend the old leaf. | |
2326 | */ | |
2327 | if (prev_bh) { | |
2328 | rb = (struct ocfs2_refcount_block *) | |
2329 | prev_bh->b_data; | |
2330 | ||
2331 | if (le64_to_cpu(rb->rf_records.rl_used) + | |
2332 | recs_add > | |
2333 | le16_to_cpu(rb->rf_records.rl_count)) | |
2334 | ref_blocks++; | |
2335 | } | |
2336 | ||
2337 | recs_add = 0; | |
2338 | *credits += 1; | |
2339 | brelse(prev_bh); | |
2340 | prev_bh = ref_leaf_bh; | |
2341 | get_bh(prev_bh); | |
2342 | } | |
2343 | ||
2344 | rb = (struct ocfs2_refcount_block *)ref_leaf_bh->b_data; | |
2345 | ||
2346 | mlog(0, "recs_add %d,cpos %llu, clusters %u, rec->r_cpos %llu," | |
2347 | "rec->r_clusters %u, rec->r_refcount %u, index %d\n", | |
2348 | recs_add, (unsigned long long)cpos, clusters, | |
2349 | (unsigned long long)le64_to_cpu(rec.r_cpos), | |
2350 | le32_to_cpu(rec.r_clusters), | |
2351 | le32_to_cpu(rec.r_refcount), index); | |
2352 | ||
2353 | len = min((u64)cpos + clusters, le64_to_cpu(rec.r_cpos) + | |
2354 | le32_to_cpu(rec.r_clusters)) - cpos; | |
2355 | /* | |
2356 | * If the refcount rec already exist, cool. We just need | |
2357 | * to check whether there is a split. Otherwise we just need | |
2358 | * to increase the refcount. | |
2359 | * If we will insert one, increases recs_add. | |
2360 | * | |
2361 | * We record all the records which will be inserted to the | |
2362 | * same refcount block, so that we can tell exactly whether | |
2363 | * we need a new refcount block or not. | |
2364 | */ | |
2365 | if (rec.r_refcount) { | |
2366 | /* Check whether we need a split at the beginning. */ | |
2367 | if (cpos == start_cpos && | |
2368 | cpos != le64_to_cpu(rec.r_cpos)) | |
2369 | recs_add++; | |
2370 | ||
2371 | /* Check whether we need a split in the end. */ | |
2372 | if (cpos + clusters < le64_to_cpu(rec.r_cpos) + | |
2373 | le32_to_cpu(rec.r_clusters)) | |
2374 | recs_add++; | |
2375 | } else | |
2376 | recs_add++; | |
2377 | ||
2378 | brelse(ref_leaf_bh); | |
2379 | ref_leaf_bh = NULL; | |
2380 | clusters -= len; | |
2381 | cpos += len; | |
2382 | } | |
2383 | ||
2384 | if (prev_bh) { | |
2385 | rb = (struct ocfs2_refcount_block *)prev_bh->b_data; | |
2386 | ||
2387 | if (le64_to_cpu(rb->rf_records.rl_used) + recs_add > | |
2388 | le16_to_cpu(rb->rf_records.rl_count)) | |
2389 | ref_blocks++; | |
2390 | ||
2391 | *credits += 1; | |
2392 | } | |
2393 | ||
2394 | if (!ref_blocks) | |
2395 | goto out; | |
2396 | ||
2397 | mlog(0, "we need ref_blocks %d\n", ref_blocks); | |
2398 | *meta_add += ref_blocks; | |
2399 | *credits += ref_blocks; | |
2400 | ||
2401 | /* | |
2402 | * So we may need ref_blocks to insert into the tree. | |
2403 | * That also means we need to change the b-tree and add that number | |
2404 | * of records since we never merge them. | |
2405 | * We need one more block for expansion since the new created leaf | |
2406 | * block is also full and needs split. | |
2407 | */ | |
2408 | rb = (struct ocfs2_refcount_block *)ref_root_bh->b_data; | |
2409 | if (le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL) { | |
2410 | struct ocfs2_extent_tree et; | |
2411 | ||
2412 | ocfs2_init_refcount_extent_tree(&et, ci, ref_root_bh); | |
2413 | *meta_add += ocfs2_extend_meta_needed(et.et_root_el); | |
2414 | *credits += ocfs2_calc_extend_credits(sb, | |
2415 | et.et_root_el, | |
2416 | ref_blocks); | |
2417 | } else { | |
2418 | *credits += OCFS2_EXPAND_REFCOUNT_TREE_CREDITS; | |
2419 | *meta_add += 1; | |
2420 | } | |
2421 | ||
2422 | out: | |
2423 | brelse(ref_leaf_bh); | |
2424 | brelse(prev_bh); | |
2425 | return ret; | |
2426 | } | |
2427 | ||
2428 | /* | |
2429 | * For refcount tree, we will decrease some contiguous clusters | |
2430 | * refcount count, so just go through it to see how many blocks | |
2431 | * we gonna touch and whether we need to create new blocks. | |
2432 | * | |
2433 | * Normally the refcount blocks store these refcount should be | |
2434 | * continguous also, so that we can get the number easily. | |
2435 | * As for meta_ac, we will at most add split 2 refcount record and | |
2436 | * 2 more refcount block, so just check it in a rough way. | |
2437 | * | |
2438 | * Caller must hold refcount tree lock. | |
2439 | */ | |
2440 | int ocfs2_prepare_refcount_change_for_del(struct inode *inode, | |
2441 | struct buffer_head *di_bh, | |
2442 | u64 phys_blkno, | |
2443 | u32 clusters, | |
2444 | int *credits, | |
2445 | struct ocfs2_alloc_context **meta_ac) | |
2446 | { | |
2447 | int ret, ref_blocks = 0; | |
2448 | struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data; | |
2449 | struct ocfs2_inode_info *oi = OCFS2_I(inode); | |
2450 | struct buffer_head *ref_root_bh = NULL; | |
2451 | struct ocfs2_refcount_tree *tree; | |
2452 | u64 start_cpos = ocfs2_blocks_to_clusters(inode->i_sb, phys_blkno); | |
2453 | ||
2454 | if (!ocfs2_refcount_tree(OCFS2_SB(inode->i_sb))) { | |
2455 | ocfs2_error(inode->i_sb, "Inode %lu want to use refcount " | |
2456 | "tree, but the feature bit is not set in the " | |
2457 | "super block.", inode->i_ino); | |
2458 | ret = -EROFS; | |
2459 | goto out; | |
2460 | } | |
2461 | ||
2462 | BUG_ON(!(oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL)); | |
2463 | ||
2464 | ret = ocfs2_get_refcount_tree(OCFS2_SB(inode->i_sb), | |
2465 | le64_to_cpu(di->i_refcount_loc), &tree); | |
2466 | if (ret) { | |
2467 | mlog_errno(ret); | |
2468 | goto out; | |
2469 | } | |
2470 | ||
2471 | ret = ocfs2_read_refcount_block(&tree->rf_ci, | |
2472 | le64_to_cpu(di->i_refcount_loc), | |
2473 | &ref_root_bh); | |
2474 | if (ret) { | |
2475 | mlog_errno(ret); | |
2476 | goto out; | |
2477 | } | |
2478 | ||
2479 | ret = ocfs2_calc_refcount_meta_credits(inode->i_sb, | |
2480 | &tree->rf_ci, | |
2481 | ref_root_bh, | |
2482 | start_cpos, clusters, | |
2483 | &ref_blocks, credits); | |
2484 | if (ret) { | |
2485 | mlog_errno(ret); | |
2486 | goto out; | |
2487 | } | |
2488 | ||
2489 | mlog(0, "reserve new metadata %d, credits = %d\n", | |
2490 | ref_blocks, *credits); | |
2491 | ||
2492 | if (ref_blocks) { | |
2493 | ret = ocfs2_reserve_new_metadata_blocks(OCFS2_SB(inode->i_sb), | |
2494 | ref_blocks, meta_ac); | |
2495 | if (ret) | |
2496 | mlog_errno(ret); | |
2497 | } | |
2498 | ||
2499 | out: | |
2500 | brelse(ref_root_bh); | |
2501 | return ret; | |
2502 | } | |
6f70fa51 TM |
2503 | |
2504 | #define MAX_CONTIG_BYTES 1048576 | |
2505 | ||
2506 | static inline unsigned int ocfs2_cow_contig_clusters(struct super_block *sb) | |
2507 | { | |
2508 | return ocfs2_clusters_for_bytes(sb, MAX_CONTIG_BYTES); | |
2509 | } | |
2510 | ||
2511 | static inline unsigned int ocfs2_cow_contig_mask(struct super_block *sb) | |
2512 | { | |
2513 | return ~(ocfs2_cow_contig_clusters(sb) - 1); | |
2514 | } | |
2515 | ||
2516 | /* | |
2517 | * Given an extent that starts at 'start' and an I/O that starts at 'cpos', | |
2518 | * find an offset (start + (n * contig_clusters)) that is closest to cpos | |
2519 | * while still being less than or equal to it. | |
2520 | * | |
2521 | * The goal is to break the extent at a multiple of contig_clusters. | |
2522 | */ | |
2523 | static inline unsigned int ocfs2_cow_align_start(struct super_block *sb, | |
2524 | unsigned int start, | |
2525 | unsigned int cpos) | |
2526 | { | |
2527 | BUG_ON(start > cpos); | |
2528 | ||
2529 | return start + ((cpos - start) & ocfs2_cow_contig_mask(sb)); | |
2530 | } | |
2531 | ||
2532 | /* | |
2533 | * Given a cluster count of len, pad it out so that it is a multiple | |
2534 | * of contig_clusters. | |
2535 | */ | |
2536 | static inline unsigned int ocfs2_cow_align_length(struct super_block *sb, | |
2537 | unsigned int len) | |
2538 | { | |
2539 | unsigned int padded = | |
2540 | (len + (ocfs2_cow_contig_clusters(sb) - 1)) & | |
2541 | ocfs2_cow_contig_mask(sb); | |
2542 | ||
2543 | /* Did we wrap? */ | |
2544 | if (padded < len) | |
2545 | padded = UINT_MAX; | |
2546 | ||
2547 | return padded; | |
2548 | } | |
2549 | ||
2550 | /* | |
2551 | * Calculate out the start and number of virtual clusters we need to to CoW. | |
2552 | * | |
2553 | * cpos is vitual start cluster position we want to do CoW in a | |
2554 | * file and write_len is the cluster length. | |
37f8a2bf | 2555 | * max_cpos is the place where we want to stop CoW intentionally. |
6f70fa51 TM |
2556 | * |
2557 | * Normal we will start CoW from the beginning of extent record cotaining cpos. | |
2558 | * We try to break up extents on boundaries of MAX_CONTIG_BYTES so that we | |
2559 | * get good I/O from the resulting extent tree. | |
2560 | */ | |
2561 | static int ocfs2_refcount_cal_cow_clusters(struct inode *inode, | |
913580b4 | 2562 | struct ocfs2_extent_list *el, |
6f70fa51 TM |
2563 | u32 cpos, |
2564 | u32 write_len, | |
37f8a2bf | 2565 | u32 max_cpos, |
6f70fa51 TM |
2566 | u32 *cow_start, |
2567 | u32 *cow_len) | |
2568 | { | |
2569 | int ret = 0; | |
6f70fa51 TM |
2570 | int tree_height = le16_to_cpu(el->l_tree_depth), i; |
2571 | struct buffer_head *eb_bh = NULL; | |
2572 | struct ocfs2_extent_block *eb = NULL; | |
2573 | struct ocfs2_extent_rec *rec; | |
2574 | unsigned int want_clusters, rec_end = 0; | |
2575 | int contig_clusters = ocfs2_cow_contig_clusters(inode->i_sb); | |
2576 | int leaf_clusters; | |
2577 | ||
37f8a2bf TM |
2578 | BUG_ON(cpos + write_len > max_cpos); |
2579 | ||
6f70fa51 TM |
2580 | if (tree_height > 0) { |
2581 | ret = ocfs2_find_leaf(INODE_CACHE(inode), el, cpos, &eb_bh); | |
2582 | if (ret) { | |
2583 | mlog_errno(ret); | |
2584 | goto out; | |
2585 | } | |
2586 | ||
2587 | eb = (struct ocfs2_extent_block *) eb_bh->b_data; | |
2588 | el = &eb->h_list; | |
2589 | ||
2590 | if (el->l_tree_depth) { | |
2591 | ocfs2_error(inode->i_sb, | |
2592 | "Inode %lu has non zero tree depth in " | |
2593 | "leaf block %llu\n", inode->i_ino, | |
2594 | (unsigned long long)eb_bh->b_blocknr); | |
2595 | ret = -EROFS; | |
2596 | goto out; | |
2597 | } | |
2598 | } | |
2599 | ||
2600 | *cow_len = 0; | |
2601 | for (i = 0; i < le16_to_cpu(el->l_next_free_rec); i++) { | |
2602 | rec = &el->l_recs[i]; | |
2603 | ||
2604 | if (ocfs2_is_empty_extent(rec)) { | |
2605 | mlog_bug_on_msg(i != 0, "Inode %lu has empty record in " | |
2606 | "index %d\n", inode->i_ino, i); | |
2607 | continue; | |
2608 | } | |
2609 | ||
2610 | if (le32_to_cpu(rec->e_cpos) + | |
2611 | le16_to_cpu(rec->e_leaf_clusters) <= cpos) | |
2612 | continue; | |
2613 | ||
2614 | if (*cow_len == 0) { | |
2615 | /* | |
2616 | * We should find a refcounted record in the | |
2617 | * first pass. | |
2618 | */ | |
2619 | BUG_ON(!(rec->e_flags & OCFS2_EXT_REFCOUNTED)); | |
2620 | *cow_start = le32_to_cpu(rec->e_cpos); | |
2621 | } | |
2622 | ||
2623 | /* | |
37f8a2bf TM |
2624 | * If we encounter a hole, a non-refcounted record or |
2625 | * pass the max_cpos, stop the search. | |
6f70fa51 TM |
2626 | */ |
2627 | if ((!(rec->e_flags & OCFS2_EXT_REFCOUNTED)) || | |
37f8a2bf TM |
2628 | (*cow_len && rec_end != le32_to_cpu(rec->e_cpos)) || |
2629 | (max_cpos <= le32_to_cpu(rec->e_cpos))) | |
6f70fa51 TM |
2630 | break; |
2631 | ||
2632 | leaf_clusters = le16_to_cpu(rec->e_leaf_clusters); | |
2633 | rec_end = le32_to_cpu(rec->e_cpos) + leaf_clusters; | |
37f8a2bf TM |
2634 | if (rec_end > max_cpos) { |
2635 | rec_end = max_cpos; | |
2636 | leaf_clusters = rec_end - le32_to_cpu(rec->e_cpos); | |
2637 | } | |
6f70fa51 TM |
2638 | |
2639 | /* | |
2640 | * How many clusters do we actually need from | |
2641 | * this extent? First we see how many we actually | |
2642 | * need to complete the write. If that's smaller | |
2643 | * than contig_clusters, we try for contig_clusters. | |
2644 | */ | |
2645 | if (!*cow_len) | |
2646 | want_clusters = write_len; | |
2647 | else | |
2648 | want_clusters = (cpos + write_len) - | |
2649 | (*cow_start + *cow_len); | |
2650 | if (want_clusters < contig_clusters) | |
2651 | want_clusters = contig_clusters; | |
2652 | ||
2653 | /* | |
2654 | * If the write does not cover the whole extent, we | |
2655 | * need to calculate how we're going to split the extent. | |
2656 | * We try to do it on contig_clusters boundaries. | |
2657 | * | |
2658 | * Any extent smaller than contig_clusters will be | |
2659 | * CoWed in its entirety. | |
2660 | */ | |
2661 | if (leaf_clusters <= contig_clusters) | |
2662 | *cow_len += leaf_clusters; | |
2663 | else if (*cow_len || (*cow_start == cpos)) { | |
2664 | /* | |
2665 | * This extent needs to be CoW'd from its | |
2666 | * beginning, so all we have to do is compute | |
2667 | * how many clusters to grab. We align | |
2668 | * want_clusters to the edge of contig_clusters | |
2669 | * to get better I/O. | |
2670 | */ | |
2671 | want_clusters = ocfs2_cow_align_length(inode->i_sb, | |
2672 | want_clusters); | |
2673 | ||
2674 | if (leaf_clusters < want_clusters) | |
2675 | *cow_len += leaf_clusters; | |
2676 | else | |
2677 | *cow_len += want_clusters; | |
2678 | } else if ((*cow_start + contig_clusters) >= | |
2679 | (cpos + write_len)) { | |
2680 | /* | |
2681 | * Breaking off contig_clusters at the front | |
2682 | * of the extent will cover our write. That's | |
2683 | * easy. | |
2684 | */ | |
2685 | *cow_len = contig_clusters; | |
2686 | } else if ((rec_end - cpos) <= contig_clusters) { | |
2687 | /* | |
2688 | * Breaking off contig_clusters at the tail of | |
2689 | * this extent will cover cpos. | |
2690 | */ | |
2691 | *cow_start = rec_end - contig_clusters; | |
2692 | *cow_len = contig_clusters; | |
2693 | } else if ((rec_end - cpos) <= want_clusters) { | |
2694 | /* | |
2695 | * While we can't fit the entire write in this | |
2696 | * extent, we know that the write goes from cpos | |
2697 | * to the end of the extent. Break that off. | |
2698 | * We try to break it at some multiple of | |
2699 | * contig_clusters from the front of the extent. | |
2700 | * Failing that (ie, cpos is within | |
2701 | * contig_clusters of the front), we'll CoW the | |
2702 | * entire extent. | |
2703 | */ | |
2704 | *cow_start = ocfs2_cow_align_start(inode->i_sb, | |
2705 | *cow_start, cpos); | |
2706 | *cow_len = rec_end - *cow_start; | |
2707 | } else { | |
2708 | /* | |
2709 | * Ok, the entire write lives in the middle of | |
2710 | * this extent. Let's try to slice the extent up | |
2711 | * nicely. Optimally, our CoW region starts at | |
2712 | * m*contig_clusters from the beginning of the | |
2713 | * extent and goes for n*contig_clusters, | |
2714 | * covering the entire write. | |
2715 | */ | |
2716 | *cow_start = ocfs2_cow_align_start(inode->i_sb, | |
2717 | *cow_start, cpos); | |
2718 | ||
2719 | want_clusters = (cpos + write_len) - *cow_start; | |
2720 | want_clusters = ocfs2_cow_align_length(inode->i_sb, | |
2721 | want_clusters); | |
2722 | if (*cow_start + want_clusters <= rec_end) | |
2723 | *cow_len = want_clusters; | |
2724 | else | |
2725 | *cow_len = rec_end - *cow_start; | |
2726 | } | |
2727 | ||
2728 | /* Have we covered our entire write yet? */ | |
2729 | if ((*cow_start + *cow_len) >= (cpos + write_len)) | |
2730 | break; | |
2731 | ||
2732 | /* | |
2733 | * If we reach the end of the extent block and don't get enough | |
2734 | * clusters, continue with the next extent block if possible. | |
2735 | */ | |
2736 | if (i + 1 == le16_to_cpu(el->l_next_free_rec) && | |
2737 | eb && eb->h_next_leaf_blk) { | |
2738 | brelse(eb_bh); | |
2739 | eb_bh = NULL; | |
2740 | ||
2741 | ret = ocfs2_read_extent_block(INODE_CACHE(inode), | |
2742 | le64_to_cpu(eb->h_next_leaf_blk), | |
2743 | &eb_bh); | |
2744 | if (ret) { | |
2745 | mlog_errno(ret); | |
2746 | goto out; | |
2747 | } | |
2748 | ||
2749 | eb = (struct ocfs2_extent_block *) eb_bh->b_data; | |
2750 | el = &eb->h_list; | |
2751 | i = -1; | |
2752 | } | |
2753 | } | |
2754 | ||
2755 | out: | |
2756 | brelse(eb_bh); | |
2757 | return ret; | |
2758 | } | |
2759 | ||
2760 | /* | |
2761 | * Prepare meta_ac, data_ac and calculate credits when we want to add some | |
2762 | * num_clusters in data_tree "et" and change the refcount for the old | |
2763 | * clusters(starting form p_cluster) in the refcount tree. | |
2764 | * | |
2765 | * Note: | |
2766 | * 1. since we may split the old tree, so we at most will need num_clusters + 2 | |
2767 | * more new leaf records. | |
2768 | * 2. In some case, we may not need to reserve new clusters(e.g, reflink), so | |
2769 | * just give data_ac = NULL. | |
2770 | */ | |
2771 | static int ocfs2_lock_refcount_allocators(struct super_block *sb, | |
2772 | u32 p_cluster, u32 num_clusters, | |
2773 | struct ocfs2_extent_tree *et, | |
2774 | struct ocfs2_caching_info *ref_ci, | |
2775 | struct buffer_head *ref_root_bh, | |
2776 | struct ocfs2_alloc_context **meta_ac, | |
2777 | struct ocfs2_alloc_context **data_ac, | |
2778 | int *credits) | |
2779 | { | |
2780 | int ret = 0, meta_add = 0; | |
2781 | int num_free_extents = ocfs2_num_free_extents(OCFS2_SB(sb), et); | |
2782 | ||
2783 | if (num_free_extents < 0) { | |
2784 | ret = num_free_extents; | |
2785 | mlog_errno(ret); | |
2786 | goto out; | |
2787 | } | |
2788 | ||
2789 | if (num_free_extents < num_clusters + 2) | |
2790 | meta_add = | |
2791 | ocfs2_extend_meta_needed(et->et_root_el); | |
2792 | ||
2793 | *credits += ocfs2_calc_extend_credits(sb, et->et_root_el, | |
2794 | num_clusters + 2); | |
2795 | ||
2796 | ret = ocfs2_calc_refcount_meta_credits(sb, ref_ci, ref_root_bh, | |
2797 | p_cluster, num_clusters, | |
2798 | &meta_add, credits); | |
2799 | if (ret) { | |
2800 | mlog_errno(ret); | |
2801 | goto out; | |
2802 | } | |
2803 | ||
2804 | mlog(0, "reserve new metadata %d, clusters %u, credits = %d\n", | |
2805 | meta_add, num_clusters, *credits); | |
2806 | ret = ocfs2_reserve_new_metadata_blocks(OCFS2_SB(sb), meta_add, | |
2807 | meta_ac); | |
2808 | if (ret) { | |
2809 | mlog_errno(ret); | |
2810 | goto out; | |
2811 | } | |
2812 | ||
2813 | if (data_ac) { | |
2814 | ret = ocfs2_reserve_clusters(OCFS2_SB(sb), num_clusters, | |
2815 | data_ac); | |
2816 | if (ret) | |
2817 | mlog_errno(ret); | |
2818 | } | |
2819 | ||
2820 | out: | |
2821 | if (ret) { | |
2822 | if (*meta_ac) { | |
2823 | ocfs2_free_alloc_context(*meta_ac); | |
2824 | *meta_ac = NULL; | |
2825 | } | |
2826 | } | |
2827 | ||
2828 | return ret; | |
2829 | } | |
2830 | ||
2831 | static int ocfs2_clear_cow_buffer(handle_t *handle, struct buffer_head *bh) | |
2832 | { | |
2833 | BUG_ON(buffer_dirty(bh)); | |
2834 | ||
2835 | clear_buffer_mapped(bh); | |
2836 | ||
2837 | return 0; | |
2838 | } | |
2839 | ||
913580b4 TM |
2840 | static int ocfs2_duplicate_clusters_by_page(handle_t *handle, |
2841 | struct ocfs2_cow_context *context, | |
2842 | u32 cpos, u32 old_cluster, | |
2843 | u32 new_cluster, u32 new_len) | |
6f70fa51 TM |
2844 | { |
2845 | int ret = 0, partial; | |
913580b4 | 2846 | struct ocfs2_caching_info *ci = context->data_et.et_ci; |
6f70fa51 TM |
2847 | struct super_block *sb = ocfs2_metadata_cache_get_super(ci); |
2848 | u64 new_block = ocfs2_clusters_to_blocks(sb, new_cluster); | |
2849 | struct page *page; | |
2850 | pgoff_t page_index; | |
2851 | unsigned int from, to; | |
2852 | loff_t offset, end, map_end; | |
2853 | struct address_space *mapping = context->inode->i_mapping; | |
2854 | ||
2855 | mlog(0, "old_cluster %u, new %u, len %u at offset %u\n", old_cluster, | |
2856 | new_cluster, new_len, cpos); | |
2857 | ||
2858 | offset = ((loff_t)cpos) << OCFS2_SB(sb)->s_clustersize_bits; | |
2859 | end = offset + (new_len << OCFS2_SB(sb)->s_clustersize_bits); | |
2860 | ||
2861 | while (offset < end) { | |
2862 | page_index = offset >> PAGE_CACHE_SHIFT; | |
2863 | map_end = (page_index + 1) << PAGE_CACHE_SHIFT; | |
2864 | if (map_end > end) | |
2865 | map_end = end; | |
2866 | ||
2867 | /* from, to is the offset within the page. */ | |
2868 | from = offset & (PAGE_CACHE_SIZE - 1); | |
2869 | to = PAGE_CACHE_SIZE; | |
2870 | if (map_end & (PAGE_CACHE_SIZE - 1)) | |
2871 | to = map_end & (PAGE_CACHE_SIZE - 1); | |
2872 | ||
2873 | page = grab_cache_page(mapping, page_index); | |
2874 | ||
2875 | /* This page can't be dirtied before we CoW it out. */ | |
2876 | BUG_ON(PageDirty(page)); | |
2877 | ||
2878 | if (!PageUptodate(page)) { | |
2879 | ret = block_read_full_page(page, ocfs2_get_block); | |
2880 | if (ret) { | |
2881 | mlog_errno(ret); | |
2882 | goto unlock; | |
2883 | } | |
2884 | lock_page(page); | |
2885 | } | |
2886 | ||
2887 | if (page_has_buffers(page)) { | |
2888 | ret = walk_page_buffers(handle, page_buffers(page), | |
2889 | from, to, &partial, | |
2890 | ocfs2_clear_cow_buffer); | |
2891 | if (ret) { | |
2892 | mlog_errno(ret); | |
2893 | goto unlock; | |
2894 | } | |
2895 | } | |
2896 | ||
2897 | ocfs2_map_and_dirty_page(context->inode, | |
2898 | handle, from, to, | |
2899 | page, 0, &new_block); | |
2900 | mark_page_accessed(page); | |
2901 | unlock: | |
2902 | unlock_page(page); | |
2903 | page_cache_release(page); | |
2904 | page = NULL; | |
2905 | offset = map_end; | |
2906 | if (ret) | |
2907 | break; | |
2908 | } | |
2909 | ||
2910 | return ret; | |
2911 | } | |
2912 | ||
492a8a33 TM |
2913 | static int ocfs2_duplicate_clusters_by_jbd(handle_t *handle, |
2914 | struct ocfs2_cow_context *context, | |
2915 | u32 cpos, u32 old_cluster, | |
2916 | u32 new_cluster, u32 new_len) | |
2917 | { | |
2918 | int ret = 0; | |
2919 | struct super_block *sb = context->inode->i_sb; | |
2920 | struct ocfs2_caching_info *ci = context->data_et.et_ci; | |
2921 | int i, blocks = ocfs2_clusters_to_blocks(sb, new_len); | |
2922 | u64 old_block = ocfs2_clusters_to_blocks(sb, old_cluster); | |
2923 | u64 new_block = ocfs2_clusters_to_blocks(sb, new_cluster); | |
2924 | struct ocfs2_super *osb = OCFS2_SB(sb); | |
2925 | struct buffer_head *old_bh = NULL; | |
2926 | struct buffer_head *new_bh = NULL; | |
2927 | ||
2928 | mlog(0, "old_cluster %u, new %u, len %u\n", old_cluster, | |
2929 | new_cluster, new_len); | |
2930 | ||
2931 | for (i = 0; i < blocks; i++, old_block++, new_block++) { | |
2932 | new_bh = sb_getblk(osb->sb, new_block); | |
2933 | if (new_bh == NULL) { | |
2934 | ret = -EIO; | |
2935 | mlog_errno(ret); | |
2936 | break; | |
2937 | } | |
2938 | ||
2939 | ocfs2_set_new_buffer_uptodate(ci, new_bh); | |
2940 | ||
2941 | ret = ocfs2_read_block(ci, old_block, &old_bh, NULL); | |
2942 | if (ret) { | |
2943 | mlog_errno(ret); | |
2944 | break; | |
2945 | } | |
2946 | ||
2947 | ret = ocfs2_journal_access(handle, ci, new_bh, | |
2948 | OCFS2_JOURNAL_ACCESS_CREATE); | |
2949 | if (ret) { | |
2950 | mlog_errno(ret); | |
2951 | break; | |
2952 | } | |
2953 | ||
2954 | memcpy(new_bh->b_data, old_bh->b_data, sb->s_blocksize); | |
2955 | ret = ocfs2_journal_dirty(handle, new_bh); | |
2956 | if (ret) { | |
2957 | mlog_errno(ret); | |
2958 | break; | |
2959 | } | |
2960 | ||
2961 | brelse(new_bh); | |
2962 | brelse(old_bh); | |
2963 | new_bh = NULL; | |
2964 | old_bh = NULL; | |
2965 | } | |
2966 | ||
2967 | brelse(new_bh); | |
2968 | brelse(old_bh); | |
2969 | return ret; | |
2970 | } | |
2971 | ||
6f70fa51 TM |
2972 | static int ocfs2_clear_ext_refcount(handle_t *handle, |
2973 | struct ocfs2_extent_tree *et, | |
2974 | u32 cpos, u32 p_cluster, u32 len, | |
2975 | unsigned int ext_flags, | |
2976 | struct ocfs2_alloc_context *meta_ac, | |
2977 | struct ocfs2_cached_dealloc_ctxt *dealloc) | |
2978 | { | |
2979 | int ret, index; | |
2980 | struct ocfs2_extent_rec replace_rec; | |
2981 | struct ocfs2_path *path = NULL; | |
2982 | struct ocfs2_extent_list *el; | |
2983 | struct super_block *sb = ocfs2_metadata_cache_get_super(et->et_ci); | |
2984 | u64 ino = ocfs2_metadata_cache_owner(et->et_ci); | |
2985 | ||
2986 | mlog(0, "inode %llu cpos %u, len %u, p_cluster %u, ext_flags %u\n", | |
2987 | (unsigned long long)ino, cpos, len, p_cluster, ext_flags); | |
2988 | ||
2989 | memset(&replace_rec, 0, sizeof(replace_rec)); | |
2990 | replace_rec.e_cpos = cpu_to_le32(cpos); | |
2991 | replace_rec.e_leaf_clusters = cpu_to_le16(len); | |
2992 | replace_rec.e_blkno = cpu_to_le64(ocfs2_clusters_to_blocks(sb, | |
2993 | p_cluster)); | |
2994 | replace_rec.e_flags = ext_flags; | |
2995 | replace_rec.e_flags &= ~OCFS2_EXT_REFCOUNTED; | |
2996 | ||
2997 | path = ocfs2_new_path_from_et(et); | |
2998 | if (!path) { | |
2999 | ret = -ENOMEM; | |
3000 | mlog_errno(ret); | |
3001 | goto out; | |
3002 | } | |
3003 | ||
3004 | ret = ocfs2_find_path(et->et_ci, path, cpos); | |
3005 | if (ret) { | |
3006 | mlog_errno(ret); | |
3007 | goto out; | |
3008 | } | |
3009 | ||
3010 | el = path_leaf_el(path); | |
3011 | ||
3012 | index = ocfs2_search_extent_list(el, cpos); | |
3013 | if (index == -1 || index >= le16_to_cpu(el->l_next_free_rec)) { | |
3014 | ocfs2_error(sb, | |
3015 | "Inode %llu has an extent at cpos %u which can no " | |
3016 | "longer be found.\n", | |
3017 | (unsigned long long)ino, cpos); | |
3018 | ret = -EROFS; | |
3019 | goto out; | |
3020 | } | |
3021 | ||
3022 | ret = ocfs2_split_extent(handle, et, path, index, | |
3023 | &replace_rec, meta_ac, dealloc); | |
3024 | if (ret) | |
3025 | mlog_errno(ret); | |
3026 | ||
3027 | out: | |
3028 | ocfs2_free_path(path); | |
3029 | return ret; | |
3030 | } | |
3031 | ||
3032 | static int ocfs2_replace_clusters(handle_t *handle, | |
3033 | struct ocfs2_cow_context *context, | |
3034 | u32 cpos, u32 old, | |
3035 | u32 new, u32 len, | |
3036 | unsigned int ext_flags) | |
3037 | { | |
3038 | int ret; | |
913580b4 | 3039 | struct ocfs2_caching_info *ci = context->data_et.et_ci; |
6f70fa51 TM |
3040 | u64 ino = ocfs2_metadata_cache_owner(ci); |
3041 | ||
3042 | mlog(0, "inode %llu, cpos %u, old %u, new %u, len %u, ext_flags %u\n", | |
3043 | (unsigned long long)ino, cpos, old, new, len, ext_flags); | |
3044 | ||
3045 | /*If the old clusters is unwritten, no need to duplicate. */ | |
3046 | if (!(ext_flags & OCFS2_EXT_UNWRITTEN)) { | |
913580b4 TM |
3047 | ret = context->cow_duplicate_clusters(handle, context, cpos, |
3048 | old, new, len); | |
6f70fa51 TM |
3049 | if (ret) { |
3050 | mlog_errno(ret); | |
3051 | goto out; | |
3052 | } | |
3053 | } | |
3054 | ||
913580b4 | 3055 | ret = ocfs2_clear_ext_refcount(handle, &context->data_et, |
6f70fa51 TM |
3056 | cpos, new, len, ext_flags, |
3057 | context->meta_ac, &context->dealloc); | |
3058 | if (ret) | |
3059 | mlog_errno(ret); | |
3060 | out: | |
3061 | return ret; | |
3062 | } | |
3063 | ||
3064 | static int ocfs2_cow_sync_writeback(struct super_block *sb, | |
3065 | struct ocfs2_cow_context *context, | |
3066 | u32 cpos, u32 num_clusters) | |
3067 | { | |
3068 | int ret = 0; | |
3069 | loff_t offset, end, map_end; | |
3070 | pgoff_t page_index; | |
3071 | struct page *page; | |
3072 | ||
3073 | if (ocfs2_should_order_data(context->inode)) | |
3074 | return 0; | |
3075 | ||
3076 | offset = ((loff_t)cpos) << OCFS2_SB(sb)->s_clustersize_bits; | |
3077 | end = offset + (num_clusters << OCFS2_SB(sb)->s_clustersize_bits); | |
3078 | ||
3079 | ret = filemap_fdatawrite_range(context->inode->i_mapping, | |
3080 | offset, end - 1); | |
3081 | if (ret < 0) { | |
3082 | mlog_errno(ret); | |
3083 | return ret; | |
3084 | } | |
3085 | ||
3086 | while (offset < end) { | |
3087 | page_index = offset >> PAGE_CACHE_SHIFT; | |
3088 | map_end = (page_index + 1) << PAGE_CACHE_SHIFT; | |
3089 | if (map_end > end) | |
3090 | map_end = end; | |
3091 | ||
3092 | page = grab_cache_page(context->inode->i_mapping, page_index); | |
3093 | BUG_ON(!page); | |
3094 | ||
3095 | wait_on_page_writeback(page); | |
3096 | if (PageError(page)) { | |
3097 | ret = -EIO; | |
3098 | mlog_errno(ret); | |
3099 | } else | |
3100 | mark_page_accessed(page); | |
3101 | ||
3102 | unlock_page(page); | |
3103 | page_cache_release(page); | |
3104 | page = NULL; | |
3105 | offset = map_end; | |
3106 | if (ret) | |
3107 | break; | |
3108 | } | |
3109 | ||
3110 | return ret; | |
3111 | } | |
3112 | ||
913580b4 TM |
3113 | static int ocfs2_di_get_clusters(struct ocfs2_cow_context *context, |
3114 | u32 v_cluster, u32 *p_cluster, | |
3115 | u32 *num_clusters, | |
3116 | unsigned int *extent_flags) | |
3117 | { | |
3118 | return ocfs2_get_clusters(context->inode, v_cluster, p_cluster, | |
3119 | num_clusters, extent_flags); | |
3120 | } | |
3121 | ||
6f70fa51 TM |
3122 | static int ocfs2_make_clusters_writable(struct super_block *sb, |
3123 | struct ocfs2_cow_context *context, | |
3124 | u32 cpos, u32 p_cluster, | |
3125 | u32 num_clusters, unsigned int e_flags) | |
3126 | { | |
6ae23c55 | 3127 | int ret, delete, index, credits = 0; |
6f70fa51 | 3128 | u32 new_bit, new_len; |
6ae23c55 | 3129 | unsigned int set_len; |
6f70fa51 TM |
3130 | struct ocfs2_super *osb = OCFS2_SB(sb); |
3131 | handle_t *handle; | |
6ae23c55 | 3132 | struct buffer_head *ref_leaf_bh = NULL; |
913580b4 | 3133 | struct ocfs2_caching_info *ref_ci = &context->ref_tree->rf_ci; |
6ae23c55 TM |
3134 | struct ocfs2_refcount_rec rec; |
3135 | ||
3136 | mlog(0, "cpos %u, p_cluster %u, num_clusters %u, e_flags %u\n", | |
3137 | cpos, p_cluster, num_clusters, e_flags); | |
6f70fa51 TM |
3138 | |
3139 | ret = ocfs2_lock_refcount_allocators(sb, p_cluster, num_clusters, | |
913580b4 TM |
3140 | &context->data_et, |
3141 | ref_ci, | |
6f70fa51 TM |
3142 | context->ref_root_bh, |
3143 | &context->meta_ac, | |
3144 | &context->data_ac, &credits); | |
3145 | if (ret) { | |
3146 | mlog_errno(ret); | |
3147 | return ret; | |
3148 | } | |
3149 | ||
492a8a33 TM |
3150 | if (context->post_refcount) |
3151 | credits += context->post_refcount->credits; | |
3152 | ||
3153 | credits += context->extra_credits; | |
6f70fa51 TM |
3154 | handle = ocfs2_start_trans(osb, credits); |
3155 | if (IS_ERR(handle)) { | |
3156 | ret = PTR_ERR(handle); | |
3157 | mlog_errno(ret); | |
3158 | goto out; | |
3159 | } | |
3160 | ||
3161 | while (num_clusters) { | |
913580b4 | 3162 | ret = ocfs2_get_refcount_rec(ref_ci, context->ref_root_bh, |
6ae23c55 TM |
3163 | p_cluster, num_clusters, |
3164 | &rec, &index, &ref_leaf_bh); | |
6f70fa51 TM |
3165 | if (ret) { |
3166 | mlog_errno(ret); | |
3167 | goto out_commit; | |
3168 | } | |
3169 | ||
6ae23c55 TM |
3170 | BUG_ON(!rec.r_refcount); |
3171 | set_len = min((u64)p_cluster + num_clusters, | |
3172 | le64_to_cpu(rec.r_cpos) + | |
3173 | le32_to_cpu(rec.r_clusters)) - p_cluster; | |
3174 | ||
3175 | /* | |
3176 | * There are many different situation here. | |
3177 | * 1. If refcount == 1, remove the flag and don't COW. | |
3178 | * 2. If refcount > 1, allocate clusters. | |
3179 | * Here we may not allocate r_len once at a time, so continue | |
3180 | * until we reach num_clusters. | |
3181 | */ | |
3182 | if (le32_to_cpu(rec.r_refcount) == 1) { | |
3183 | delete = 0; | |
913580b4 TM |
3184 | ret = ocfs2_clear_ext_refcount(handle, |
3185 | &context->data_et, | |
6ae23c55 TM |
3186 | cpos, p_cluster, |
3187 | set_len, e_flags, | |
3188 | context->meta_ac, | |
3189 | &context->dealloc); | |
3190 | if (ret) { | |
3191 | mlog_errno(ret); | |
3192 | goto out_commit; | |
3193 | } | |
3194 | } else { | |
3195 | delete = 1; | |
3196 | ||
3197 | ret = __ocfs2_claim_clusters(osb, handle, | |
3198 | context->data_ac, | |
3199 | 1, set_len, | |
3200 | &new_bit, &new_len); | |
3201 | if (ret) { | |
3202 | mlog_errno(ret); | |
3203 | goto out_commit; | |
3204 | } | |
3205 | ||
3206 | ret = ocfs2_replace_clusters(handle, context, | |
3207 | cpos, p_cluster, new_bit, | |
3208 | new_len, e_flags); | |
3209 | if (ret) { | |
3210 | mlog_errno(ret); | |
3211 | goto out_commit; | |
3212 | } | |
3213 | set_len = new_len; | |
3214 | } | |
3215 | ||
913580b4 | 3216 | ret = __ocfs2_decrease_refcount(handle, ref_ci, |
6ae23c55 TM |
3217 | context->ref_root_bh, |
3218 | p_cluster, set_len, | |
3219 | context->meta_ac, | |
3220 | &context->dealloc, delete); | |
6f70fa51 TM |
3221 | if (ret) { |
3222 | mlog_errno(ret); | |
3223 | goto out_commit; | |
3224 | } | |
3225 | ||
6ae23c55 TM |
3226 | cpos += set_len; |
3227 | p_cluster += set_len; | |
3228 | num_clusters -= set_len; | |
3229 | brelse(ref_leaf_bh); | |
3230 | ref_leaf_bh = NULL; | |
6f70fa51 TM |
3231 | } |
3232 | ||
492a8a33 TM |
3233 | /* handle any post_cow action. */ |
3234 | if (context->post_refcount && context->post_refcount->func) { | |
3235 | ret = context->post_refcount->func(context->inode, handle, | |
3236 | context->post_refcount->para); | |
3237 | if (ret) { | |
3238 | mlog_errno(ret); | |
3239 | goto out_commit; | |
3240 | } | |
3241 | } | |
3242 | ||
6f70fa51 TM |
3243 | /* |
3244 | * Here we should write the new page out first if we are | |
3245 | * in write-back mode. | |
3246 | */ | |
492a8a33 TM |
3247 | if (context->get_clusters == ocfs2_di_get_clusters) { |
3248 | ret = ocfs2_cow_sync_writeback(sb, context, cpos, num_clusters); | |
3249 | if (ret) | |
3250 | mlog_errno(ret); | |
3251 | } | |
6f70fa51 TM |
3252 | |
3253 | out_commit: | |
3254 | ocfs2_commit_trans(osb, handle); | |
3255 | ||
3256 | out: | |
3257 | if (context->data_ac) { | |
3258 | ocfs2_free_alloc_context(context->data_ac); | |
3259 | context->data_ac = NULL; | |
3260 | } | |
3261 | if (context->meta_ac) { | |
3262 | ocfs2_free_alloc_context(context->meta_ac); | |
3263 | context->meta_ac = NULL; | |
3264 | } | |
6ae23c55 | 3265 | brelse(ref_leaf_bh); |
6f70fa51 TM |
3266 | |
3267 | return ret; | |
3268 | } | |
3269 | ||
913580b4 | 3270 | static int ocfs2_replace_cow(struct ocfs2_cow_context *context) |
6f70fa51 TM |
3271 | { |
3272 | int ret = 0; | |
913580b4 TM |
3273 | struct inode *inode = context->inode; |
3274 | u32 cow_start = context->cow_start, cow_len = context->cow_len; | |
3275 | u32 p_cluster, num_clusters; | |
6f70fa51 TM |
3276 | unsigned int ext_flags; |
3277 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
6f70fa51 TM |
3278 | |
3279 | if (!ocfs2_refcount_tree(OCFS2_SB(inode->i_sb))) { | |
3280 | ocfs2_error(inode->i_sb, "Inode %lu want to use refcount " | |
3281 | "tree, but the feature bit is not set in the " | |
3282 | "super block.", inode->i_ino); | |
3283 | return -EROFS; | |
3284 | } | |
3285 | ||
6f70fa51 | 3286 | ocfs2_init_dealloc_ctxt(&context->dealloc); |
6f70fa51 TM |
3287 | |
3288 | while (cow_len) { | |
913580b4 TM |
3289 | ret = context->get_clusters(context, cow_start, &p_cluster, |
3290 | &num_clusters, &ext_flags); | |
6f70fa51 TM |
3291 | if (ret) { |
3292 | mlog_errno(ret); | |
3293 | break; | |
3294 | } | |
3295 | ||
3296 | BUG_ON(!(ext_flags & OCFS2_EXT_REFCOUNTED)); | |
3297 | ||
3298 | if (cow_len < num_clusters) | |
3299 | num_clusters = cow_len; | |
3300 | ||
3301 | ret = ocfs2_make_clusters_writable(inode->i_sb, context, | |
3302 | cow_start, p_cluster, | |
3303 | num_clusters, ext_flags); | |
3304 | if (ret) { | |
3305 | mlog_errno(ret); | |
3306 | break; | |
3307 | } | |
3308 | ||
3309 | cow_len -= num_clusters; | |
3310 | cow_start += num_clusters; | |
3311 | } | |
3312 | ||
6f70fa51 TM |
3313 | if (ocfs2_dealloc_has_cluster(&context->dealloc)) { |
3314 | ocfs2_schedule_truncate_log_flush(osb, 1); | |
3315 | ocfs2_run_deallocs(osb, &context->dealloc); | |
3316 | } | |
3317 | ||
6f70fa51 TM |
3318 | return ret; |
3319 | } | |
3320 | ||
3321 | /* | |
37f8a2bf TM |
3322 | * Starting at cpos, try to CoW write_len clusters. Don't CoW |
3323 | * past max_cpos. This will stop when it runs into a hole or an | |
3324 | * unrefcounted extent. | |
6f70fa51 TM |
3325 | */ |
3326 | static int ocfs2_refcount_cow_hunk(struct inode *inode, | |
3327 | struct buffer_head *di_bh, | |
37f8a2bf | 3328 | u32 cpos, u32 write_len, u32 max_cpos) |
6f70fa51 TM |
3329 | { |
3330 | int ret; | |
3331 | u32 cow_start = 0, cow_len = 0; | |
3332 | struct ocfs2_inode_info *oi = OCFS2_I(inode); | |
3333 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
3334 | struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data; | |
3335 | struct buffer_head *ref_root_bh = NULL; | |
3336 | struct ocfs2_refcount_tree *ref_tree; | |
913580b4 | 3337 | struct ocfs2_cow_context *context = NULL; |
6f70fa51 TM |
3338 | |
3339 | BUG_ON(!(oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL)); | |
3340 | ||
913580b4 | 3341 | ret = ocfs2_refcount_cal_cow_clusters(inode, &di->id2.i_list, |
37f8a2bf | 3342 | cpos, write_len, max_cpos, |
6f70fa51 TM |
3343 | &cow_start, &cow_len); |
3344 | if (ret) { | |
3345 | mlog_errno(ret); | |
3346 | goto out; | |
3347 | } | |
37f8a2bf | 3348 | |
6f70fa51 TM |
3349 | mlog(0, "CoW inode %lu, cpos %u, write_len %u, cow_start %u, " |
3350 | "cow_len %u\n", inode->i_ino, | |
3351 | cpos, write_len, cow_start, cow_len); | |
3352 | ||
3353 | BUG_ON(cow_len == 0); | |
3354 | ||
913580b4 TM |
3355 | context = kzalloc(sizeof(struct ocfs2_cow_context), GFP_NOFS); |
3356 | if (!context) { | |
3357 | ret = -ENOMEM; | |
3358 | mlog_errno(ret); | |
3359 | goto out; | |
3360 | } | |
3361 | ||
6f70fa51 TM |
3362 | ret = ocfs2_lock_refcount_tree(osb, le64_to_cpu(di->i_refcount_loc), |
3363 | 1, &ref_tree, &ref_root_bh); | |
3364 | if (ret) { | |
3365 | mlog_errno(ret); | |
3366 | goto out; | |
3367 | } | |
3368 | ||
913580b4 TM |
3369 | context->inode = inode; |
3370 | context->cow_start = cow_start; | |
3371 | context->cow_len = cow_len; | |
3372 | context->ref_tree = ref_tree; | |
3373 | context->ref_root_bh = ref_root_bh; | |
3374 | context->cow_duplicate_clusters = ocfs2_duplicate_clusters_by_page; | |
3375 | context->get_clusters = ocfs2_di_get_clusters; | |
3376 | ||
3377 | ocfs2_init_dinode_extent_tree(&context->data_et, | |
3378 | INODE_CACHE(inode), di_bh); | |
3379 | ||
3380 | ret = ocfs2_replace_cow(context); | |
6f70fa51 TM |
3381 | if (ret) |
3382 | mlog_errno(ret); | |
3383 | ||
913580b4 TM |
3384 | /* |
3385 | * truncate the extent map here since no matter whether we meet with | |
3386 | * any error during the action, we shouldn't trust cached extent map | |
3387 | * any more. | |
3388 | */ | |
3389 | ocfs2_extent_map_trunc(inode, cow_start); | |
3390 | ||
6f70fa51 TM |
3391 | ocfs2_unlock_refcount_tree(osb, ref_tree, 1); |
3392 | brelse(ref_root_bh); | |
3393 | out: | |
913580b4 | 3394 | kfree(context); |
6f70fa51 TM |
3395 | return ret; |
3396 | } | |
3397 | ||
3398 | /* | |
3399 | * CoW any and all clusters between cpos and cpos+write_len. | |
37f8a2bf TM |
3400 | * Don't CoW past max_cpos. If this returns successfully, all |
3401 | * clusters between cpos and cpos+write_len are safe to modify. | |
6f70fa51 TM |
3402 | */ |
3403 | int ocfs2_refcount_cow(struct inode *inode, | |
3404 | struct buffer_head *di_bh, | |
37f8a2bf | 3405 | u32 cpos, u32 write_len, u32 max_cpos) |
6f70fa51 TM |
3406 | { |
3407 | int ret = 0; | |
3408 | u32 p_cluster, num_clusters; | |
3409 | unsigned int ext_flags; | |
3410 | ||
3411 | while (write_len) { | |
3412 | ret = ocfs2_get_clusters(inode, cpos, &p_cluster, | |
3413 | &num_clusters, &ext_flags); | |
3414 | if (ret) { | |
3415 | mlog_errno(ret); | |
3416 | break; | |
3417 | } | |
3418 | ||
3419 | if (write_len < num_clusters) | |
3420 | num_clusters = write_len; | |
3421 | ||
3422 | if (ext_flags & OCFS2_EXT_REFCOUNTED) { | |
3423 | ret = ocfs2_refcount_cow_hunk(inode, di_bh, cpos, | |
37f8a2bf | 3424 | num_clusters, max_cpos); |
6f70fa51 TM |
3425 | if (ret) { |
3426 | mlog_errno(ret); | |
3427 | break; | |
3428 | } | |
3429 | } | |
3430 | ||
3431 | write_len -= num_clusters; | |
3432 | cpos += num_clusters; | |
3433 | } | |
3434 | ||
3435 | return ret; | |
3436 | } | |
110a045a | 3437 | |
492a8a33 TM |
3438 | static int ocfs2_xattr_value_get_clusters(struct ocfs2_cow_context *context, |
3439 | u32 v_cluster, u32 *p_cluster, | |
3440 | u32 *num_clusters, | |
3441 | unsigned int *extent_flags) | |
3442 | { | |
3443 | struct inode *inode = context->inode; | |
3444 | struct ocfs2_xattr_value_root *xv = context->cow_object; | |
3445 | ||
3446 | return ocfs2_xattr_get_clusters(inode, v_cluster, p_cluster, | |
3447 | num_clusters, &xv->xr_list, | |
3448 | extent_flags); | |
3449 | } | |
3450 | ||
3451 | /* | |
3452 | * Given a xattr value root, calculate the most meta/credits we need for | |
3453 | * refcount tree change if we truncate it to 0. | |
3454 | */ | |
3455 | int ocfs2_refcounted_xattr_delete_need(struct inode *inode, | |
3456 | struct ocfs2_caching_info *ref_ci, | |
3457 | struct buffer_head *ref_root_bh, | |
3458 | struct ocfs2_xattr_value_root *xv, | |
3459 | int *meta_add, int *credits) | |
3460 | { | |
3461 | int ret = 0, index, ref_blocks = 0; | |
3462 | u32 p_cluster, num_clusters; | |
3463 | u32 cpos = 0, clusters = le32_to_cpu(xv->xr_clusters); | |
3464 | struct ocfs2_refcount_block *rb; | |
3465 | struct ocfs2_refcount_rec rec; | |
3466 | struct buffer_head *ref_leaf_bh = NULL; | |
3467 | ||
3468 | while (cpos < clusters) { | |
3469 | ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster, | |
3470 | &num_clusters, &xv->xr_list, | |
3471 | NULL); | |
3472 | if (ret) { | |
3473 | mlog_errno(ret); | |
3474 | goto out; | |
3475 | } | |
3476 | ||
3477 | cpos += num_clusters; | |
3478 | ||
3479 | while (num_clusters) { | |
3480 | ret = ocfs2_get_refcount_rec(ref_ci, ref_root_bh, | |
3481 | p_cluster, num_clusters, | |
3482 | &rec, &index, | |
3483 | &ref_leaf_bh); | |
3484 | if (ret) { | |
3485 | mlog_errno(ret); | |
3486 | goto out; | |
3487 | } | |
3488 | ||
3489 | BUG_ON(!rec.r_refcount); | |
3490 | ||
3491 | rb = (struct ocfs2_refcount_block *)ref_leaf_bh->b_data; | |
3492 | ||
3493 | /* | |
3494 | * We really don't know whether the other clusters is in | |
3495 | * this refcount block or not, so just take the worst | |
3496 | * case that all the clusters are in this block and each | |
3497 | * one will split a refcount rec, so totally we need | |
3498 | * clusters * 2 new refcount rec. | |
3499 | */ | |
3500 | if (le64_to_cpu(rb->rf_records.rl_used) + clusters * 2 > | |
3501 | le16_to_cpu(rb->rf_records.rl_count)) | |
3502 | ref_blocks++; | |
3503 | ||
3504 | *credits += 1; | |
3505 | brelse(ref_leaf_bh); | |
3506 | ref_leaf_bh = NULL; | |
3507 | ||
3508 | if (num_clusters <= le32_to_cpu(rec.r_clusters)) | |
3509 | break; | |
3510 | else | |
3511 | num_clusters -= le32_to_cpu(rec.r_clusters); | |
3512 | p_cluster += num_clusters; | |
3513 | } | |
3514 | } | |
3515 | ||
3516 | *meta_add += ref_blocks; | |
3517 | if (!ref_blocks) | |
3518 | goto out; | |
3519 | ||
3520 | rb = (struct ocfs2_refcount_block *)ref_root_bh->b_data; | |
3521 | if (le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL) | |
3522 | *credits += OCFS2_EXPAND_REFCOUNT_TREE_CREDITS; | |
3523 | else { | |
3524 | struct ocfs2_extent_tree et; | |
3525 | ||
3526 | ocfs2_init_refcount_extent_tree(&et, ref_ci, ref_root_bh); | |
3527 | *credits += ocfs2_calc_extend_credits(inode->i_sb, | |
3528 | et.et_root_el, | |
3529 | ref_blocks); | |
3530 | } | |
3531 | ||
3532 | out: | |
3533 | brelse(ref_leaf_bh); | |
3534 | return ret; | |
3535 | } | |
3536 | ||
3537 | /* | |
3538 | * Do CoW for xattr. | |
3539 | */ | |
3540 | int ocfs2_refcount_cow_xattr(struct inode *inode, | |
3541 | struct ocfs2_dinode *di, | |
3542 | struct ocfs2_xattr_value_buf *vb, | |
3543 | struct ocfs2_refcount_tree *ref_tree, | |
3544 | struct buffer_head *ref_root_bh, | |
3545 | u32 cpos, u32 write_len, | |
3546 | struct ocfs2_post_refcount *post) | |
3547 | { | |
3548 | int ret; | |
3549 | struct ocfs2_xattr_value_root *xv = vb->vb_xv; | |
3550 | struct ocfs2_inode_info *oi = OCFS2_I(inode); | |
3551 | struct ocfs2_cow_context *context = NULL; | |
3552 | u32 cow_start, cow_len; | |
3553 | ||
3554 | BUG_ON(!(oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL)); | |
3555 | ||
3556 | ret = ocfs2_refcount_cal_cow_clusters(inode, &xv->xr_list, | |
3557 | cpos, write_len, UINT_MAX, | |
3558 | &cow_start, &cow_len); | |
3559 | if (ret) { | |
3560 | mlog_errno(ret); | |
3561 | goto out; | |
3562 | } | |
3563 | ||
3564 | BUG_ON(cow_len == 0); | |
3565 | ||
3566 | context = kzalloc(sizeof(struct ocfs2_cow_context), GFP_NOFS); | |
3567 | if (!context) { | |
3568 | ret = -ENOMEM; | |
3569 | mlog_errno(ret); | |
3570 | goto out; | |
3571 | } | |
3572 | ||
3573 | context->inode = inode; | |
3574 | context->cow_start = cow_start; | |
3575 | context->cow_len = cow_len; | |
3576 | context->ref_tree = ref_tree; | |
3577 | context->ref_root_bh = ref_root_bh;; | |
3578 | context->cow_object = xv; | |
3579 | ||
3580 | context->cow_duplicate_clusters = ocfs2_duplicate_clusters_by_jbd; | |
3581 | /* We need the extra credits for duplicate_clusters by jbd. */ | |
3582 | context->extra_credits = | |
3583 | ocfs2_clusters_to_blocks(inode->i_sb, 1) * cow_len; | |
3584 | context->get_clusters = ocfs2_xattr_value_get_clusters; | |
3585 | context->post_refcount = post; | |
3586 | ||
3587 | ocfs2_init_xattr_value_extent_tree(&context->data_et, | |
3588 | INODE_CACHE(inode), vb); | |
3589 | ||
3590 | ret = ocfs2_replace_cow(context); | |
3591 | if (ret) | |
3592 | mlog_errno(ret); | |
3593 | ||
3594 | out: | |
3595 | kfree(context); | |
3596 | return ret; | |
3597 | } | |
3598 | ||
110a045a TM |
3599 | /* |
3600 | * Insert a new extent into refcount tree and mark a extent rec | |
3601 | * as refcounted in the dinode tree. | |
3602 | */ | |
3603 | int ocfs2_add_refcount_flag(struct inode *inode, | |
3604 | struct ocfs2_extent_tree *data_et, | |
3605 | struct ocfs2_caching_info *ref_ci, | |
3606 | struct buffer_head *ref_root_bh, | |
3607 | u32 cpos, u32 p_cluster, u32 num_clusters, | |
0129241e TM |
3608 | struct ocfs2_cached_dealloc_ctxt *dealloc, |
3609 | struct ocfs2_post_refcount *post) | |
110a045a TM |
3610 | { |
3611 | int ret; | |
3612 | handle_t *handle; | |
3613 | int credits = 1, ref_blocks = 0; | |
3614 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
3615 | struct ocfs2_alloc_context *meta_ac = NULL; | |
3616 | ||
3617 | ret = ocfs2_calc_refcount_meta_credits(inode->i_sb, | |
3618 | ref_ci, ref_root_bh, | |
3619 | p_cluster, num_clusters, | |
3620 | &ref_blocks, &credits); | |
3621 | if (ret) { | |
3622 | mlog_errno(ret); | |
3623 | goto out; | |
3624 | } | |
3625 | ||
3626 | mlog(0, "reserve new metadata %d, credits = %d\n", | |
3627 | ref_blocks, credits); | |
3628 | ||
3629 | if (ref_blocks) { | |
3630 | ret = ocfs2_reserve_new_metadata_blocks(OCFS2_SB(inode->i_sb), | |
3631 | ref_blocks, &meta_ac); | |
3632 | if (ret) { | |
3633 | mlog_errno(ret); | |
3634 | goto out; | |
3635 | } | |
3636 | } | |
3637 | ||
0129241e TM |
3638 | if (post) |
3639 | credits += post->credits; | |
3640 | ||
110a045a TM |
3641 | handle = ocfs2_start_trans(osb, credits); |
3642 | if (IS_ERR(handle)) { | |
3643 | ret = PTR_ERR(handle); | |
3644 | mlog_errno(ret); | |
3645 | goto out; | |
3646 | } | |
3647 | ||
3648 | ret = ocfs2_mark_extent_refcounted(inode, data_et, handle, | |
3649 | cpos, num_clusters, p_cluster, | |
3650 | meta_ac, dealloc); | |
3651 | if (ret) { | |
3652 | mlog_errno(ret); | |
3653 | goto out_commit; | |
3654 | } | |
3655 | ||
7540c1a7 TM |
3656 | ret = __ocfs2_increase_refcount(handle, ref_ci, ref_root_bh, |
3657 | p_cluster, num_clusters, 0, | |
3658 | meta_ac, dealloc); | |
0129241e | 3659 | if (ret) { |
110a045a | 3660 | mlog_errno(ret); |
0129241e TM |
3661 | goto out_commit; |
3662 | } | |
3663 | ||
3664 | if (post && post->func) { | |
3665 | ret = post->func(inode, handle, post->para); | |
3666 | if (ret) | |
3667 | mlog_errno(ret); | |
3668 | } | |
110a045a TM |
3669 | |
3670 | out_commit: | |
3671 | ocfs2_commit_trans(osb, handle); | |
3672 | out: | |
3673 | if (meta_ac) | |
3674 | ocfs2_free_alloc_context(meta_ac); | |
3675 | return ret; | |
3676 | } | |
3677 | ||
a9063ab9 TM |
3678 | static int ocfs2_change_ctime(struct inode *inode, |
3679 | struct buffer_head *di_bh) | |
3680 | { | |
3681 | int ret; | |
3682 | handle_t *handle; | |
3683 | struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data; | |
3684 | ||
3685 | handle = ocfs2_start_trans(OCFS2_SB(inode->i_sb), | |
3686 | OCFS2_INODE_UPDATE_CREDITS); | |
3687 | if (IS_ERR(handle)) { | |
3688 | ret = PTR_ERR(handle); | |
3689 | mlog_errno(ret); | |
3690 | goto out; | |
3691 | } | |
3692 | ||
3693 | ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh, | |
3694 | OCFS2_JOURNAL_ACCESS_WRITE); | |
3695 | if (ret) { | |
3696 | mlog_errno(ret); | |
3697 | goto out_commit; | |
3698 | } | |
3699 | ||
3700 | inode->i_ctime = CURRENT_TIME; | |
3701 | di->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec); | |
3702 | di->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec); | |
3703 | ||
3704 | ocfs2_journal_dirty(handle, di_bh); | |
3705 | ||
3706 | out_commit: | |
3707 | ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle); | |
3708 | out: | |
3709 | return ret; | |
3710 | } | |
3711 | ||
110a045a TM |
3712 | static int ocfs2_attach_refcount_tree(struct inode *inode, |
3713 | struct buffer_head *di_bh) | |
3714 | { | |
a9063ab9 | 3715 | int ret, data_changed = 0; |
110a045a TM |
3716 | struct buffer_head *ref_root_bh = NULL; |
3717 | struct ocfs2_inode_info *oi = OCFS2_I(inode); | |
3718 | struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data; | |
3719 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
3720 | struct ocfs2_refcount_tree *ref_tree; | |
3721 | unsigned int ext_flags; | |
3722 | loff_t size; | |
3723 | u32 cpos, num_clusters, clusters, p_cluster; | |
3724 | struct ocfs2_cached_dealloc_ctxt dealloc; | |
3725 | struct ocfs2_extent_tree di_et; | |
3726 | ||
3727 | ocfs2_init_dealloc_ctxt(&dealloc); | |
3728 | ||
3729 | if (!(oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL)) { | |
3730 | ret = ocfs2_create_refcount_tree(inode, di_bh); | |
3731 | if (ret) { | |
3732 | mlog_errno(ret); | |
3733 | goto out; | |
3734 | } | |
3735 | } | |
3736 | ||
3737 | BUG_ON(!di->i_refcount_loc); | |
3738 | ret = ocfs2_lock_refcount_tree(osb, | |
3739 | le64_to_cpu(di->i_refcount_loc), 1, | |
3740 | &ref_tree, &ref_root_bh); | |
3741 | if (ret) { | |
3742 | mlog_errno(ret); | |
3743 | goto out; | |
3744 | } | |
3745 | ||
2f48d593 TM |
3746 | if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) |
3747 | goto attach_xattr; | |
3748 | ||
110a045a TM |
3749 | ocfs2_init_dinode_extent_tree(&di_et, INODE_CACHE(inode), di_bh); |
3750 | ||
3751 | size = i_size_read(inode); | |
3752 | clusters = ocfs2_clusters_for_bytes(inode->i_sb, size); | |
3753 | ||
3754 | cpos = 0; | |
3755 | while (cpos < clusters) { | |
3756 | ret = ocfs2_get_clusters(inode, cpos, &p_cluster, | |
3757 | &num_clusters, &ext_flags); | |
3758 | ||
3759 | if (p_cluster && !(ext_flags & OCFS2_EXT_REFCOUNTED)) { | |
3760 | ret = ocfs2_add_refcount_flag(inode, &di_et, | |
3761 | &ref_tree->rf_ci, | |
3762 | ref_root_bh, cpos, | |
3763 | p_cluster, num_clusters, | |
0129241e | 3764 | &dealloc, NULL); |
110a045a TM |
3765 | if (ret) { |
3766 | mlog_errno(ret); | |
a9063ab9 | 3767 | goto unlock; |
110a045a | 3768 | } |
a9063ab9 TM |
3769 | |
3770 | data_changed = 1; | |
110a045a TM |
3771 | } |
3772 | cpos += num_clusters; | |
3773 | } | |
3774 | ||
2f48d593 | 3775 | attach_xattr: |
0129241e TM |
3776 | if (oi->ip_dyn_features & OCFS2_HAS_XATTR_FL) { |
3777 | ret = ocfs2_xattr_attach_refcount_tree(inode, di_bh, | |
3778 | &ref_tree->rf_ci, | |
3779 | ref_root_bh, | |
3780 | &dealloc); | |
3781 | if (ret) { | |
3782 | mlog_errno(ret); | |
3783 | goto unlock; | |
3784 | } | |
3785 | } | |
3786 | ||
a9063ab9 TM |
3787 | if (data_changed) { |
3788 | ret = ocfs2_change_ctime(inode, di_bh); | |
3789 | if (ret) | |
3790 | mlog_errno(ret); | |
3791 | } | |
3792 | ||
3793 | unlock: | |
110a045a TM |
3794 | ocfs2_unlock_refcount_tree(osb, ref_tree, 1); |
3795 | brelse(ref_root_bh); | |
3796 | ||
3797 | if (!ret && ocfs2_dealloc_has_cluster(&dealloc)) { | |
3798 | ocfs2_schedule_truncate_log_flush(osb, 1); | |
3799 | ocfs2_run_deallocs(osb, &dealloc); | |
3800 | } | |
3801 | out: | |
3802 | /* | |
3803 | * Empty the extent map so that we may get the right extent | |
3804 | * record from the disk. | |
3805 | */ | |
3806 | ocfs2_extent_map_trunc(inode, 0); | |
3807 | ||
3808 | return ret; | |
3809 | } | |
3810 | ||
3811 | static int ocfs2_add_refcounted_extent(struct inode *inode, | |
3812 | struct ocfs2_extent_tree *et, | |
3813 | struct ocfs2_caching_info *ref_ci, | |
3814 | struct buffer_head *ref_root_bh, | |
3815 | u32 cpos, u32 p_cluster, u32 num_clusters, | |
3816 | unsigned int ext_flags, | |
3817 | struct ocfs2_cached_dealloc_ctxt *dealloc) | |
3818 | { | |
3819 | int ret; | |
3820 | handle_t *handle; | |
3821 | int credits = 0; | |
3822 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
3823 | struct ocfs2_alloc_context *meta_ac = NULL; | |
3824 | ||
3825 | ret = ocfs2_lock_refcount_allocators(inode->i_sb, | |
3826 | p_cluster, num_clusters, | |
3827 | et, ref_ci, | |
3828 | ref_root_bh, &meta_ac, | |
3829 | NULL, &credits); | |
3830 | if (ret) { | |
3831 | mlog_errno(ret); | |
3832 | goto out; | |
3833 | } | |
3834 | ||
3835 | handle = ocfs2_start_trans(osb, credits); | |
3836 | if (IS_ERR(handle)) { | |
3837 | ret = PTR_ERR(handle); | |
3838 | mlog_errno(ret); | |
3839 | goto out; | |
3840 | } | |
3841 | ||
3842 | ret = ocfs2_insert_extent(handle, et, cpos, | |
3843 | cpu_to_le64(ocfs2_clusters_to_blocks(inode->i_sb, | |
3844 | p_cluster)), | |
3845 | num_clusters, ext_flags, meta_ac); | |
3846 | if (ret) { | |
3847 | mlog_errno(ret); | |
3848 | goto out_commit; | |
3849 | } | |
3850 | ||
2999d12f TM |
3851 | ret = ocfs2_increase_refcount(handle, ref_ci, ref_root_bh, |
3852 | p_cluster, num_clusters, | |
3853 | meta_ac, dealloc); | |
110a045a TM |
3854 | if (ret) |
3855 | mlog_errno(ret); | |
3856 | ||
3857 | out_commit: | |
3858 | ocfs2_commit_trans(osb, handle); | |
3859 | out: | |
3860 | if (meta_ac) | |
3861 | ocfs2_free_alloc_context(meta_ac); | |
3862 | return ret; | |
3863 | } | |
3864 | ||
2f48d593 TM |
3865 | static int ocfs2_duplicate_inline_data(struct inode *s_inode, |
3866 | struct buffer_head *s_bh, | |
3867 | struct inode *t_inode, | |
3868 | struct buffer_head *t_bh) | |
3869 | { | |
3870 | int ret; | |
3871 | handle_t *handle; | |
3872 | struct ocfs2_super *osb = OCFS2_SB(s_inode->i_sb); | |
3873 | struct ocfs2_dinode *s_di = (struct ocfs2_dinode *)s_bh->b_data; | |
3874 | struct ocfs2_dinode *t_di = (struct ocfs2_dinode *)t_bh->b_data; | |
3875 | ||
3876 | BUG_ON(!(OCFS2_I(s_inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)); | |
3877 | ||
3878 | handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS); | |
3879 | if (IS_ERR(handle)) { | |
3880 | ret = PTR_ERR(handle); | |
3881 | mlog_errno(ret); | |
3882 | goto out; | |
3883 | } | |
3884 | ||
3885 | ret = ocfs2_journal_access_di(handle, INODE_CACHE(t_inode), t_bh, | |
3886 | OCFS2_JOURNAL_ACCESS_WRITE); | |
3887 | if (ret) { | |
3888 | mlog_errno(ret); | |
3889 | goto out_commit; | |
3890 | } | |
3891 | ||
3892 | t_di->id2.i_data.id_count = s_di->id2.i_data.id_count; | |
3893 | memcpy(t_di->id2.i_data.id_data, s_di->id2.i_data.id_data, | |
3894 | le16_to_cpu(s_di->id2.i_data.id_count)); | |
3895 | spin_lock(&OCFS2_I(t_inode)->ip_lock); | |
3896 | OCFS2_I(t_inode)->ip_dyn_features |= OCFS2_INLINE_DATA_FL; | |
3897 | t_di->i_dyn_features = cpu_to_le16(OCFS2_I(t_inode)->ip_dyn_features); | |
3898 | spin_unlock(&OCFS2_I(t_inode)->ip_lock); | |
3899 | ||
3900 | ocfs2_journal_dirty(handle, t_bh); | |
3901 | ||
3902 | out_commit: | |
3903 | ocfs2_commit_trans(osb, handle); | |
3904 | out: | |
3905 | return ret; | |
3906 | } | |
3907 | ||
110a045a TM |
3908 | static int ocfs2_duplicate_extent_list(struct inode *s_inode, |
3909 | struct inode *t_inode, | |
3910 | struct buffer_head *t_bh, | |
3911 | struct ocfs2_caching_info *ref_ci, | |
3912 | struct buffer_head *ref_root_bh, | |
3913 | struct ocfs2_cached_dealloc_ctxt *dealloc) | |
3914 | { | |
3915 | int ret = 0; | |
3916 | u32 p_cluster, num_clusters, clusters, cpos; | |
3917 | loff_t size; | |
3918 | unsigned int ext_flags; | |
3919 | struct ocfs2_extent_tree et; | |
3920 | ||
3921 | ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(t_inode), t_bh); | |
3922 | ||
3923 | size = i_size_read(s_inode); | |
3924 | clusters = ocfs2_clusters_for_bytes(s_inode->i_sb, size); | |
3925 | ||
3926 | cpos = 0; | |
3927 | while (cpos < clusters) { | |
3928 | ret = ocfs2_get_clusters(s_inode, cpos, &p_cluster, | |
3929 | &num_clusters, &ext_flags); | |
3930 | ||
3931 | if (p_cluster) { | |
3932 | ret = ocfs2_add_refcounted_extent(t_inode, &et, | |
3933 | ref_ci, ref_root_bh, | |
3934 | cpos, p_cluster, | |
3935 | num_clusters, | |
3936 | ext_flags, | |
3937 | dealloc); | |
3938 | if (ret) { | |
3939 | mlog_errno(ret); | |
3940 | goto out; | |
3941 | } | |
3942 | } | |
3943 | ||
3944 | cpos += num_clusters; | |
3945 | } | |
3946 | ||
3947 | out: | |
3948 | return ret; | |
3949 | } | |
3950 | ||
a9063ab9 TM |
3951 | /* |
3952 | * change the new file's attributes to the src. | |
3953 | * | |
3954 | * reflink creates a snapshot of a file, that means the attributes | |
3955 | * must be identical except for three exceptions - nlink, ino, and ctime. | |
3956 | */ | |
3957 | static int ocfs2_complete_reflink(struct inode *s_inode, | |
3958 | struct buffer_head *s_bh, | |
3959 | struct inode *t_inode, | |
0fe9b66c TM |
3960 | struct buffer_head *t_bh, |
3961 | bool preserve) | |
a9063ab9 TM |
3962 | { |
3963 | int ret; | |
3964 | handle_t *handle; | |
3965 | struct ocfs2_dinode *s_di = (struct ocfs2_dinode *)s_bh->b_data; | |
3966 | struct ocfs2_dinode *di = (struct ocfs2_dinode *)t_bh->b_data; | |
3967 | loff_t size = i_size_read(s_inode); | |
3968 | ||
3969 | handle = ocfs2_start_trans(OCFS2_SB(t_inode->i_sb), | |
3970 | OCFS2_INODE_UPDATE_CREDITS); | |
3971 | if (IS_ERR(handle)) { | |
3972 | ret = PTR_ERR(handle); | |
3973 | mlog_errno(ret); | |
3974 | return ret; | |
3975 | } | |
3976 | ||
3977 | ret = ocfs2_journal_access_di(handle, INODE_CACHE(t_inode), t_bh, | |
3978 | OCFS2_JOURNAL_ACCESS_WRITE); | |
3979 | if (ret) { | |
3980 | mlog_errno(ret); | |
3981 | goto out_commit; | |
3982 | } | |
3983 | ||
3984 | spin_lock(&OCFS2_I(t_inode)->ip_lock); | |
3985 | OCFS2_I(t_inode)->ip_clusters = OCFS2_I(s_inode)->ip_clusters; | |
3986 | OCFS2_I(t_inode)->ip_attr = OCFS2_I(s_inode)->ip_attr; | |
3987 | OCFS2_I(t_inode)->ip_dyn_features = OCFS2_I(s_inode)->ip_dyn_features; | |
3988 | spin_unlock(&OCFS2_I(t_inode)->ip_lock); | |
3989 | i_size_write(t_inode, size); | |
3990 | ||
3991 | di->i_xattr_inline_size = s_di->i_xattr_inline_size; | |
3992 | di->i_clusters = s_di->i_clusters; | |
3993 | di->i_size = s_di->i_size; | |
3994 | di->i_dyn_features = s_di->i_dyn_features; | |
3995 | di->i_attr = s_di->i_attr; | |
a9063ab9 | 3996 | |
0fe9b66c TM |
3997 | if (preserve) { |
3998 | di->i_uid = s_di->i_uid; | |
3999 | di->i_gid = s_di->i_gid; | |
4000 | di->i_mode = s_di->i_mode; | |
4001 | ||
4002 | /* | |
4003 | * update time. | |
4004 | * we want mtime to appear identical to the source and | |
4005 | * update ctime. | |
4006 | */ | |
4007 | t_inode->i_ctime = CURRENT_TIME; | |
a9063ab9 | 4008 | |
0fe9b66c TM |
4009 | di->i_ctime = cpu_to_le64(t_inode->i_ctime.tv_sec); |
4010 | di->i_ctime_nsec = cpu_to_le32(t_inode->i_ctime.tv_nsec); | |
a9063ab9 | 4011 | |
0fe9b66c TM |
4012 | t_inode->i_mtime = s_inode->i_mtime; |
4013 | di->i_mtime = s_di->i_mtime; | |
4014 | di->i_mtime_nsec = s_di->i_mtime_nsec; | |
4015 | } | |
a9063ab9 TM |
4016 | |
4017 | ocfs2_journal_dirty(handle, t_bh); | |
4018 | ||
4019 | out_commit: | |
4020 | ocfs2_commit_trans(OCFS2_SB(t_inode->i_sb), handle); | |
4021 | return ret; | |
4022 | } | |
4023 | ||
110a045a TM |
4024 | static int ocfs2_create_reflink_node(struct inode *s_inode, |
4025 | struct buffer_head *s_bh, | |
4026 | struct inode *t_inode, | |
0fe9b66c TM |
4027 | struct buffer_head *t_bh, |
4028 | bool preserve) | |
110a045a TM |
4029 | { |
4030 | int ret; | |
4031 | struct buffer_head *ref_root_bh = NULL; | |
4032 | struct ocfs2_cached_dealloc_ctxt dealloc; | |
4033 | struct ocfs2_super *osb = OCFS2_SB(s_inode->i_sb); | |
4034 | struct ocfs2_refcount_block *rb; | |
4035 | struct ocfs2_dinode *di = (struct ocfs2_dinode *)s_bh->b_data; | |
4036 | struct ocfs2_refcount_tree *ref_tree; | |
4037 | ||
4038 | ocfs2_init_dealloc_ctxt(&dealloc); | |
4039 | ||
4040 | ret = ocfs2_set_refcount_tree(t_inode, t_bh, | |
4041 | le64_to_cpu(di->i_refcount_loc)); | |
4042 | if (ret) { | |
4043 | mlog_errno(ret); | |
4044 | goto out; | |
4045 | } | |
4046 | ||
2f48d593 TM |
4047 | if (OCFS2_I(s_inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) { |
4048 | ret = ocfs2_duplicate_inline_data(s_inode, s_bh, | |
4049 | t_inode, t_bh); | |
4050 | if (ret) | |
4051 | mlog_errno(ret); | |
4052 | goto out; | |
4053 | } | |
4054 | ||
110a045a TM |
4055 | ret = ocfs2_lock_refcount_tree(osb, le64_to_cpu(di->i_refcount_loc), |
4056 | 1, &ref_tree, &ref_root_bh); | |
4057 | if (ret) { | |
4058 | mlog_errno(ret); | |
4059 | goto out; | |
4060 | } | |
4061 | rb = (struct ocfs2_refcount_block *)ref_root_bh->b_data; | |
4062 | ||
4063 | ret = ocfs2_duplicate_extent_list(s_inode, t_inode, t_bh, | |
4064 | &ref_tree->rf_ci, ref_root_bh, | |
4065 | &dealloc); | |
a9063ab9 TM |
4066 | if (ret) { |
4067 | mlog_errno(ret); | |
4068 | goto out_unlock_refcount; | |
4069 | } | |
4070 | ||
a9063ab9 | 4071 | out_unlock_refcount: |
110a045a TM |
4072 | ocfs2_unlock_refcount_tree(osb, ref_tree, 1); |
4073 | brelse(ref_root_bh); | |
4074 | out: | |
4075 | if (ocfs2_dealloc_has_cluster(&dealloc)) { | |
4076 | ocfs2_schedule_truncate_log_flush(osb, 1); | |
4077 | ocfs2_run_deallocs(osb, &dealloc); | |
4078 | } | |
4079 | ||
4080 | return ret; | |
4081 | } | |
09bf27a0 TM |
4082 | |
4083 | static int __ocfs2_reflink(struct dentry *old_dentry, | |
4084 | struct buffer_head *old_bh, | |
4085 | struct inode *new_inode, | |
4086 | bool preserve) | |
4087 | { | |
4088 | int ret; | |
4089 | struct inode *inode = old_dentry->d_inode; | |
4090 | struct buffer_head *new_bh = NULL; | |
4091 | ||
4092 | ret = filemap_fdatawrite(inode->i_mapping); | |
4093 | if (ret) { | |
4094 | mlog_errno(ret); | |
4095 | goto out; | |
4096 | } | |
4097 | ||
4098 | ret = ocfs2_attach_refcount_tree(inode, old_bh); | |
4099 | if (ret) { | |
4100 | mlog_errno(ret); | |
4101 | goto out; | |
4102 | } | |
4103 | ||
4104 | mutex_lock(&new_inode->i_mutex); | |
4105 | ret = ocfs2_inode_lock(new_inode, &new_bh, 1); | |
4106 | if (ret) { | |
4107 | mlog_errno(ret); | |
4108 | goto out_unlock; | |
4109 | } | |
4110 | ||
4111 | ret = ocfs2_create_reflink_node(inode, old_bh, | |
4112 | new_inode, new_bh, preserve); | |
4113 | if (ret) { | |
4114 | mlog_errno(ret); | |
4115 | goto inode_unlock; | |
4116 | } | |
4117 | ||
4118 | if (OCFS2_I(inode)->ip_dyn_features & OCFS2_HAS_XATTR_FL) { | |
4119 | ret = ocfs2_reflink_xattrs(inode, old_bh, | |
4120 | new_inode, new_bh, | |
4121 | preserve); | |
87f4b1bb | 4122 | if (ret) { |
09bf27a0 | 4123 | mlog_errno(ret); |
87f4b1bb TM |
4124 | goto inode_unlock; |
4125 | } | |
09bf27a0 | 4126 | } |
87f4b1bb TM |
4127 | |
4128 | ret = ocfs2_complete_reflink(inode, old_bh, | |
4129 | new_inode, new_bh, preserve); | |
4130 | if (ret) | |
4131 | mlog_errno(ret); | |
4132 | ||
09bf27a0 TM |
4133 | inode_unlock: |
4134 | ocfs2_inode_unlock(new_inode, 1); | |
4135 | brelse(new_bh); | |
4136 | out_unlock: | |
4137 | mutex_unlock(&new_inode->i_mutex); | |
4138 | out: | |
4139 | if (!ret) { | |
4140 | ret = filemap_fdatawait(inode->i_mapping); | |
4141 | if (ret) | |
4142 | mlog_errno(ret); | |
4143 | } | |
4144 | return ret; | |
4145 | } | |
4146 | ||
4147 | static int ocfs2_reflink(struct dentry *old_dentry, struct inode *dir, | |
4148 | struct dentry *new_dentry, bool preserve) | |
4149 | { | |
4150 | int error; | |
4151 | struct inode *inode = old_dentry->d_inode; | |
4152 | struct buffer_head *old_bh = NULL; | |
4153 | struct inode *new_orphan_inode = NULL; | |
4154 | ||
4155 | if (!ocfs2_refcount_tree(OCFS2_SB(inode->i_sb))) | |
4156 | return -EOPNOTSUPP; | |
4157 | ||
4158 | error = ocfs2_create_inode_in_orphan(dir, inode->i_mode, | |
4159 | &new_orphan_inode); | |
4160 | if (error) { | |
4161 | mlog_errno(error); | |
4162 | goto out; | |
4163 | } | |
4164 | ||
4165 | error = ocfs2_inode_lock(inode, &old_bh, 1); | |
4166 | if (error) { | |
4167 | mlog_errno(error); | |
4168 | goto out; | |
4169 | } | |
4170 | ||
4171 | down_write(&OCFS2_I(inode)->ip_xattr_sem); | |
4172 | down_write(&OCFS2_I(inode)->ip_alloc_sem); | |
4173 | error = __ocfs2_reflink(old_dentry, old_bh, | |
4174 | new_orphan_inode, preserve); | |
4175 | up_write(&OCFS2_I(inode)->ip_alloc_sem); | |
4176 | up_write(&OCFS2_I(inode)->ip_xattr_sem); | |
4177 | ||
4178 | ocfs2_inode_unlock(inode, 1); | |
4179 | brelse(old_bh); | |
4180 | ||
4181 | if (error) { | |
4182 | mlog_errno(error); | |
4183 | goto out; | |
4184 | } | |
4185 | ||
4186 | /* If the security isn't preserved, we need to re-initialize them. */ | |
4187 | if (!preserve) { | |
4188 | error = ocfs2_init_security_and_acl(dir, new_orphan_inode); | |
4189 | if (error) | |
4190 | mlog_errno(error); | |
4191 | } | |
4192 | out: | |
4193 | if (!error) { | |
4194 | error = ocfs2_mv_orphaned_inode_to_new(dir, new_orphan_inode, | |
4195 | new_dentry); | |
4196 | if (error) | |
4197 | mlog_errno(error); | |
4198 | } | |
4199 | ||
4200 | if (new_orphan_inode) { | |
4201 | /* | |
4202 | * We need to open_unlock the inode no matter whether we | |
4203 | * succeed or not, so that other nodes can delete it later. | |
4204 | */ | |
4205 | ocfs2_open_unlock(new_orphan_inode); | |
4206 | if (error) | |
4207 | iput(new_orphan_inode); | |
4208 | } | |
4209 | ||
4210 | return error; | |
4211 | } | |
bd50873d TM |
4212 | |
4213 | /* | |
4214 | * Below here are the bits used by OCFS2_IOC_REFLINK() to fake | |
4215 | * sys_reflink(). This will go away when vfs_reflink() exists in | |
4216 | * fs/namei.c. | |
4217 | */ | |
4218 | ||
4219 | /* copied from may_create in VFS. */ | |
4220 | static inline int ocfs2_may_create(struct inode *dir, struct dentry *child) | |
4221 | { | |
4222 | if (child->d_inode) | |
4223 | return -EEXIST; | |
4224 | if (IS_DEADDIR(dir)) | |
4225 | return -ENOENT; | |
4226 | return inode_permission(dir, MAY_WRITE | MAY_EXEC); | |
4227 | } | |
4228 | ||
4229 | /* copied from user_path_parent. */ | |
4230 | static int ocfs2_user_path_parent(const char __user *path, | |
4231 | struct nameidata *nd, char **name) | |
4232 | { | |
4233 | char *s = getname(path); | |
4234 | int error; | |
4235 | ||
4236 | if (IS_ERR(s)) | |
4237 | return PTR_ERR(s); | |
4238 | ||
4239 | error = path_lookup(s, LOOKUP_PARENT, nd); | |
4240 | if (error) | |
4241 | putname(s); | |
4242 | else | |
4243 | *name = s; | |
4244 | ||
4245 | return error; | |
4246 | } | |
4247 | ||
4248 | /** | |
4249 | * ocfs2_vfs_reflink - Create a reference-counted link | |
4250 | * | |
4251 | * @old_dentry: source dentry + inode | |
4252 | * @dir: directory to create the target | |
4253 | * @new_dentry: target dentry | |
4254 | * @preserve: if true, preserve all file attributes | |
4255 | */ | |
4256 | int ocfs2_vfs_reflink(struct dentry *old_dentry, struct inode *dir, | |
4257 | struct dentry *new_dentry, bool preserve) | |
4258 | { | |
4259 | struct inode *inode = old_dentry->d_inode; | |
4260 | int error; | |
4261 | ||
4262 | if (!inode) | |
4263 | return -ENOENT; | |
4264 | ||
4265 | error = ocfs2_may_create(dir, new_dentry); | |
4266 | if (error) | |
4267 | return error; | |
4268 | ||
4269 | if (dir->i_sb != inode->i_sb) | |
4270 | return -EXDEV; | |
4271 | ||
4272 | /* | |
4273 | * A reflink to an append-only or immutable file cannot be created. | |
4274 | */ | |
4275 | if (IS_APPEND(inode) || IS_IMMUTABLE(inode)) | |
4276 | return -EPERM; | |
4277 | ||
4278 | /* Only regular files can be reflinked. */ | |
4279 | if (!S_ISREG(inode->i_mode)) | |
4280 | return -EPERM; | |
4281 | ||
4282 | /* | |
4283 | * If the caller wants to preserve ownership, they require the | |
4284 | * rights to do so. | |
4285 | */ | |
4286 | if (preserve) { | |
4287 | if ((current_fsuid() != inode->i_uid) && !capable(CAP_CHOWN)) | |
4288 | return -EPERM; | |
4289 | if (!in_group_p(inode->i_gid) && !capable(CAP_CHOWN)) | |
4290 | return -EPERM; | |
4291 | } | |
4292 | ||
4293 | /* | |
4294 | * If the caller is modifying any aspect of the attributes, they | |
4295 | * are not creating a snapshot. They need read permission on the | |
4296 | * file. | |
4297 | */ | |
4298 | if (!preserve) { | |
4299 | error = inode_permission(inode, MAY_READ); | |
4300 | if (error) | |
4301 | return error; | |
4302 | } | |
4303 | ||
4304 | mutex_lock(&inode->i_mutex); | |
4305 | vfs_dq_init(dir); | |
4306 | error = ocfs2_reflink(old_dentry, dir, new_dentry, preserve); | |
4307 | mutex_unlock(&inode->i_mutex); | |
4308 | if (!error) | |
4309 | fsnotify_create(dir, new_dentry); | |
4310 | return error; | |
4311 | } | |
4312 | /* | |
4313 | * Most codes are copied from sys_linkat. | |
4314 | */ | |
4315 | int ocfs2_reflink_ioctl(struct inode *inode, | |
4316 | const char __user *oldname, | |
4317 | const char __user *newname, | |
4318 | bool preserve) | |
4319 | { | |
4320 | struct dentry *new_dentry; | |
4321 | struct nameidata nd; | |
4322 | struct path old_path; | |
4323 | int error; | |
4324 | char *to = NULL; | |
4325 | ||
4326 | if (!ocfs2_refcount_tree(OCFS2_SB(inode->i_sb))) | |
4327 | return -EOPNOTSUPP; | |
4328 | ||
4329 | error = user_path_at(AT_FDCWD, oldname, 0, &old_path); | |
4330 | if (error) { | |
4331 | mlog_errno(error); | |
4332 | return error; | |
4333 | } | |
4334 | ||
4335 | error = ocfs2_user_path_parent(newname, &nd, &to); | |
4336 | if (error) { | |
4337 | mlog_errno(error); | |
4338 | goto out; | |
4339 | } | |
4340 | ||
4341 | error = -EXDEV; | |
4342 | if (old_path.mnt != nd.path.mnt) | |
4343 | goto out_release; | |
4344 | new_dentry = lookup_create(&nd, 0); | |
4345 | error = PTR_ERR(new_dentry); | |
4346 | if (IS_ERR(new_dentry)) { | |
4347 | mlog_errno(error); | |
4348 | goto out_unlock; | |
4349 | } | |
4350 | ||
4351 | error = mnt_want_write(nd.path.mnt); | |
4352 | if (error) { | |
4353 | mlog_errno(error); | |
4354 | goto out_dput; | |
4355 | } | |
4356 | ||
4357 | error = ocfs2_vfs_reflink(old_path.dentry, | |
4358 | nd.path.dentry->d_inode, | |
4359 | new_dentry, preserve); | |
4360 | mnt_drop_write(nd.path.mnt); | |
4361 | out_dput: | |
4362 | dput(new_dentry); | |
4363 | out_unlock: | |
4364 | mutex_unlock(&nd.path.dentry->d_inode->i_mutex); | |
4365 | out_release: | |
4366 | path_put(&nd.path); | |
4367 | putname(to); | |
4368 | out: | |
4369 | path_put(&old_path); | |
4370 | ||
4371 | return error; | |
4372 | } |