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OMAPDSS: VENC: fix NULL pointer dereference in DSS2 VENC sysfs debug attr on OMAP4
[zen-stable.git] / fs / ocfs2 / refcounttree.c
blob9f32d7cbb7a3701f1f28d938b17ae4d057dc4e84
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
18 #include <linux/sort.h>
19 #include <cluster/masklog.h>
20 #include "ocfs2.h"
21 #include "inode.h"
22 #include "alloc.h"
23 #include "suballoc.h"
24 #include "journal.h"
25 #include "uptodate.h"
26 #include "super.h"
27 #include "buffer_head_io.h"
28 #include "blockcheck.h"
29 #include "refcounttree.h"
30 #include "sysfile.h"
31 #include "dlmglue.h"
32 #include "extent_map.h"
33 #include "aops.h"
34 #include "xattr.h"
35 #include "namei.h"
36 #include "ocfs2_trace.h"
37
38 #include <linux/bio.h>
39 #include <linux/blkdev.h>
40 #include <linux/slab.h>
41 #include <linux/writeback.h>
42 #include <linux/pagevec.h>
43 #include <linux/swap.h>
44 #include <linux/security.h>
45 #include <linux/fsnotify.h>
46 #include <linux/quotaops.h>
47 #include <linux/namei.h>
48 #include <linux/mount.h>
49
50 struct ocfs2_cow_context {
51 struct inode *inode;
52 struct file *file;
53 u32 cow_start;
54 u32 cow_len;
55 struct ocfs2_extent_tree data_et;
56 struct ocfs2_refcount_tree *ref_tree;
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;
61 void *cow_object;
62 struct ocfs2_post_refcount *post_refcount;
63 int extra_credits;
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 file *file,
70 u32 cpos, u32 old_cluster,
71 u32 new_cluster, u32 new_len);
72 };
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 }
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 trace_ocfs2_validate_refcount_block((unsigned long long)bh->b_blocknr);
88
89 BUG_ON(!buffer_uptodate(bh));
90
91 /*
92 * If the ecc fails, we return the error but otherwise
93 * leave the filesystem running. We know any error is
94 * local to this block.
95 */
96 rc = ocfs2_validate_meta_ecc(sb, bh->b_data, &rb->rf_check);
97 if (rc) {
98 mlog(ML_ERROR, "Checksum failed for refcount block %llu\n",
99 (unsigned long long)bh->b_blocknr);
100 return rc;
101 }
102
103
104 if (!OCFS2_IS_VALID_REFCOUNT_BLOCK(rb)) {
105 ocfs2_error(sb,
106 "Refcount block #%llu has bad signature %.*s",
107 (unsigned long long)bh->b_blocknr, 7,
108 rb->rf_signature);
109 return -EINVAL;
110 }
111
112 if (le64_to_cpu(rb->rf_blkno) != bh->b_blocknr) {
113 ocfs2_error(sb,
114 "Refcount block #%llu has an invalid rf_blkno "
115 "of %llu",
116 (unsigned long long)bh->b_blocknr,
117 (unsigned long long)le64_to_cpu(rb->rf_blkno));
118 return -EINVAL;
119 }
120
121 if (le32_to_cpu(rb->rf_fs_generation) != OCFS2_SB(sb)->fs_generation) {
122 ocfs2_error(sb,
123 "Refcount block #%llu has an invalid "
124 "rf_fs_generation of #%u",
125 (unsigned long long)bh->b_blocknr,
126 le32_to_cpu(rb->rf_fs_generation));
127 return -EINVAL;
128 }
129
130 return 0;
131 }
132
133 static int ocfs2_read_refcount_block(struct ocfs2_caching_info *ci,
134 u64 rb_blkno,
135 struct buffer_head **bh)
136 {
137 int rc;
138 struct buffer_head *tmp = *bh;
139
140 rc = ocfs2_read_block(ci, rb_blkno, &tmp,
141 ocfs2_validate_refcount_block);
142
143 /* If ocfs2_read_block() got us a new bh, pass it up. */
144 if (!rc && !*bh)
145 *bh = tmp;
146
147 return rc;
148 }
149
150 static u64 ocfs2_refcount_cache_owner(struct ocfs2_caching_info *ci)
151 {
152 struct ocfs2_refcount_tree *rf = cache_info_to_refcount(ci);
153
154 return rf->rf_blkno;
155 }
156
157 static struct super_block *
158 ocfs2_refcount_cache_get_super(struct ocfs2_caching_info *ci)
159 {
160 struct ocfs2_refcount_tree *rf = cache_info_to_refcount(ci);
161
162 return rf->rf_sb;
163 }
164
165 static void ocfs2_refcount_cache_lock(struct ocfs2_caching_info *ci)
166 {
167 struct ocfs2_refcount_tree *rf = cache_info_to_refcount(ci);
168
169 spin_lock(&rf->rf_lock);
170 }
171
172 static void ocfs2_refcount_cache_unlock(struct ocfs2_caching_info *ci)
173 {
174 struct ocfs2_refcount_tree *rf = cache_info_to_refcount(ci);
175
176 spin_unlock(&rf->rf_lock);
177 }
178
179 static void ocfs2_refcount_cache_io_lock(struct ocfs2_caching_info *ci)
180 {
181 struct ocfs2_refcount_tree *rf = cache_info_to_refcount(ci);
182
183 mutex_lock(&rf->rf_io_mutex);
184 }
185
186 static void ocfs2_refcount_cache_io_unlock(struct ocfs2_caching_info *ci)
187 {
188 struct ocfs2_refcount_tree *rf = cache_info_to_refcount(ci);
189
190 mutex_unlock(&rf->rf_io_mutex);
191 }
192
193 static const struct ocfs2_caching_operations ocfs2_refcount_caching_ops = {
194 .co_owner = ocfs2_refcount_cache_owner,
195 .co_get_super = ocfs2_refcount_cache_get_super,
196 .co_cache_lock = ocfs2_refcount_cache_lock,
197 .co_cache_unlock = ocfs2_refcount_cache_unlock,
198 .co_io_lock = ocfs2_refcount_cache_io_lock,
199 .co_io_unlock = ocfs2_refcount_cache_io_unlock,
200 };
201
202 static struct ocfs2_refcount_tree *
203 ocfs2_find_refcount_tree(struct ocfs2_super *osb, u64 blkno)
204 {
205 struct rb_node *n = osb->osb_rf_lock_tree.rb_node;
206 struct ocfs2_refcount_tree *tree = NULL;
207
208 while (n) {
209 tree = rb_entry(n, struct ocfs2_refcount_tree, rf_node);
210
211 if (blkno < tree->rf_blkno)
212 n = n->rb_left;
213 else if (blkno > tree->rf_blkno)
214 n = n->rb_right;
215 else
216 return tree;
217 }
218
219 return NULL;
220 }
221
222 /* osb_lock is already locked. */
223 static void ocfs2_insert_refcount_tree(struct ocfs2_super *osb,
224 struct ocfs2_refcount_tree *new)
225 {
226 u64 rf_blkno = new->rf_blkno;
227 struct rb_node *parent = NULL;
228 struct rb_node **p = &osb->osb_rf_lock_tree.rb_node;
229 struct ocfs2_refcount_tree *tmp;
230
231 while (*p) {
232 parent = *p;
233
234 tmp = rb_entry(parent, struct ocfs2_refcount_tree,
235 rf_node);
236
237 if (rf_blkno < tmp->rf_blkno)
238 p = &(*p)->rb_left;
239 else if (rf_blkno > tmp->rf_blkno)
240 p = &(*p)->rb_right;
241 else {
242 /* This should never happen! */
243 mlog(ML_ERROR, "Duplicate refcount block %llu found!\n",
244 (unsigned long long)rf_blkno);
245 BUG();
246 }
247 }
248
249 rb_link_node(&new->rf_node, parent, p);
250 rb_insert_color(&new->rf_node, &osb->osb_rf_lock_tree);
251 }
252
253 static void ocfs2_free_refcount_tree(struct ocfs2_refcount_tree *tree)
254 {
255 ocfs2_metadata_cache_exit(&tree->rf_ci);
256 ocfs2_simple_drop_lockres(OCFS2_SB(tree->rf_sb), &tree->rf_lockres);
257 ocfs2_lock_res_free(&tree->rf_lockres);
258 kfree(tree);
259 }
260
261 static inline void
262 ocfs2_erase_refcount_tree_from_list_no_lock(struct ocfs2_super *osb,
263 struct ocfs2_refcount_tree *tree)
264 {
265 rb_erase(&tree->rf_node, &osb->osb_rf_lock_tree);
266 if (osb->osb_ref_tree_lru && osb->osb_ref_tree_lru == tree)
267 osb->osb_ref_tree_lru = NULL;
268 }
269
270 static void ocfs2_erase_refcount_tree_from_list(struct ocfs2_super *osb,
271 struct ocfs2_refcount_tree *tree)
272 {
273 spin_lock(&osb->osb_lock);
274 ocfs2_erase_refcount_tree_from_list_no_lock(osb, tree);
275 spin_unlock(&osb->osb_lock);
276 }
277
278 static void ocfs2_kref_remove_refcount_tree(struct kref *kref)
279 {
280 struct ocfs2_refcount_tree *tree =
281 container_of(kref, struct ocfs2_refcount_tree, rf_getcnt);
282
283 ocfs2_free_refcount_tree(tree);
284 }
285
286 static inline void
287 ocfs2_refcount_tree_get(struct ocfs2_refcount_tree *tree)
288 {
289 kref_get(&tree->rf_getcnt);
290 }
291
292 static inline void
293 ocfs2_refcount_tree_put(struct ocfs2_refcount_tree *tree)
294 {
295 kref_put(&tree->rf_getcnt, ocfs2_kref_remove_refcount_tree);
296 }
297
298 static inline void ocfs2_init_refcount_tree_ci(struct ocfs2_refcount_tree *new,
299 struct super_block *sb)
300 {
301 ocfs2_metadata_cache_init(&new->rf_ci, &ocfs2_refcount_caching_ops);
302 mutex_init(&new->rf_io_mutex);
303 new->rf_sb = sb;
304 spin_lock_init(&new->rf_lock);
305 }
306
307 static inline void ocfs2_init_refcount_tree_lock(struct ocfs2_super *osb,
308 struct ocfs2_refcount_tree *new,
309 u64 rf_blkno, u32 generation)
310 {
311 init_rwsem(&new->rf_sem);
312 ocfs2_refcount_lock_res_init(&new->rf_lockres, osb,
313 rf_blkno, generation);
314 }
315
316 static struct ocfs2_refcount_tree*
317 ocfs2_allocate_refcount_tree(struct ocfs2_super *osb, u64 rf_blkno)
318 {
319 struct ocfs2_refcount_tree *new;
320
321 new = kzalloc(sizeof(struct ocfs2_refcount_tree), GFP_NOFS);
322 if (!new)
323 return NULL;
324
325 new->rf_blkno = rf_blkno;
326 kref_init(&new->rf_getcnt);
327 ocfs2_init_refcount_tree_ci(new, osb->sb);
328
329 return new;
330 }
331
332 static int ocfs2_get_refcount_tree(struct ocfs2_super *osb, u64 rf_blkno,
333 struct ocfs2_refcount_tree **ret_tree)
334 {
335 int ret = 0;
336 struct ocfs2_refcount_tree *tree, *new = NULL;
337 struct buffer_head *ref_root_bh = NULL;
338 struct ocfs2_refcount_block *ref_rb;
339
340 spin_lock(&osb->osb_lock);
341 if (osb->osb_ref_tree_lru &&
342 osb->osb_ref_tree_lru->rf_blkno == rf_blkno)
343 tree = osb->osb_ref_tree_lru;
344 else
345 tree = ocfs2_find_refcount_tree(osb, rf_blkno);
346 if (tree)
347 goto out;
348
349 spin_unlock(&osb->osb_lock);
350
351 new = ocfs2_allocate_refcount_tree(osb, rf_blkno);
352 if (!new) {
353 ret = -ENOMEM;
354 mlog_errno(ret);
355 return ret;
356 }
357 /*
358 * We need the generation to create the refcount tree lock and since
359 * it isn't changed during the tree modification, we are safe here to
360 * read without protection.
361 * We also have to purge the cache after we create the lock since the
362 * refcount block may have the stale data. It can only be trusted when
363 * we hold the refcount lock.
364 */
365 ret = ocfs2_read_refcount_block(&new->rf_ci, rf_blkno, &ref_root_bh);
366 if (ret) {
367 mlog_errno(ret);
368 ocfs2_metadata_cache_exit(&new->rf_ci);
369 kfree(new);
370 return ret;
371 }
372
373 ref_rb = (struct ocfs2_refcount_block *)ref_root_bh->b_data;
374 new->rf_generation = le32_to_cpu(ref_rb->rf_generation);
375 ocfs2_init_refcount_tree_lock(osb, new, rf_blkno,
376 new->rf_generation);
377 ocfs2_metadata_cache_purge(&new->rf_ci);
378
379 spin_lock(&osb->osb_lock);
380 tree = ocfs2_find_refcount_tree(osb, rf_blkno);
381 if (tree)
382 goto out;
383
384 ocfs2_insert_refcount_tree(osb, new);
385
386 tree = new;
387 new = NULL;
388
389 out:
390 *ret_tree = tree;
391
392 osb->osb_ref_tree_lru = tree;
393
394 spin_unlock(&osb->osb_lock);
395
396 if (new)
397 ocfs2_free_refcount_tree(new);
398
399 brelse(ref_root_bh);
400 return ret;
401 }
402
403 static int ocfs2_get_refcount_block(struct inode *inode, u64 *ref_blkno)
404 {
405 int ret;
406 struct buffer_head *di_bh = NULL;
407 struct ocfs2_dinode *di;
408
409 ret = ocfs2_read_inode_block(inode, &di_bh);
410 if (ret) {
411 mlog_errno(ret);
412 goto out;
413 }
414
415 BUG_ON(!(OCFS2_I(inode)->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL));
416
417 di = (struct ocfs2_dinode *)di_bh->b_data;
418 *ref_blkno = le64_to_cpu(di->i_refcount_loc);
419 brelse(di_bh);
420 out:
421 return ret;
422 }
423
424 static int __ocfs2_lock_refcount_tree(struct ocfs2_super *osb,
425 struct ocfs2_refcount_tree *tree, int rw)
426 {
427 int ret;
428
429 ret = ocfs2_refcount_lock(tree, rw);
430 if (ret) {
431 mlog_errno(ret);
432 goto out;
433 }
434
435 if (rw)
436 down_write(&tree->rf_sem);
437 else
438 down_read(&tree->rf_sem);
439
440 out:
441 return ret;
442 }
443
444 /*
445 * Lock the refcount tree pointed by ref_blkno and return the tree.
446 * In most case, we lock the tree and read the refcount block.
447 * So read it here if the caller really needs it.
448 *
449 * If the tree has been re-created by other node, it will free the
450 * old one and re-create it.
451 */
452 int ocfs2_lock_refcount_tree(struct ocfs2_super *osb,
453 u64 ref_blkno, int rw,
454 struct ocfs2_refcount_tree **ret_tree,
455 struct buffer_head **ref_bh)
456 {
457 int ret, delete_tree = 0;
458 struct ocfs2_refcount_tree *tree = NULL;
459 struct buffer_head *ref_root_bh = NULL;
460 struct ocfs2_refcount_block *rb;
461
462 again:
463 ret = ocfs2_get_refcount_tree(osb, ref_blkno, &tree);
464 if (ret) {
465 mlog_errno(ret);
466 return ret;
467 }
468
469 ocfs2_refcount_tree_get(tree);
470
471 ret = __ocfs2_lock_refcount_tree(osb, tree, rw);
472 if (ret) {
473 mlog_errno(ret);
474 ocfs2_refcount_tree_put(tree);
475 goto out;
476 }
477
478 ret = ocfs2_read_refcount_block(&tree->rf_ci, tree->rf_blkno,
479 &ref_root_bh);
480 if (ret) {
481 mlog_errno(ret);
482 ocfs2_unlock_refcount_tree(osb, tree, rw);
483 ocfs2_refcount_tree_put(tree);
484 goto out;
485 }
486
487 rb = (struct ocfs2_refcount_block *)ref_root_bh->b_data;
488 /*
489 * If the refcount block has been freed and re-created, we may need
490 * to recreate the refcount tree also.
491 *
492 * Here we just remove the tree from the rb-tree, and the last
493 * kref holder will unlock and delete this refcount_tree.
494 * Then we goto "again" and ocfs2_get_refcount_tree will create
495 * the new refcount tree for us.
496 */
497 if (tree->rf_generation != le32_to_cpu(rb->rf_generation)) {
498 if (!tree->rf_removed) {
499 ocfs2_erase_refcount_tree_from_list(osb, tree);
500 tree->rf_removed = 1;
501 delete_tree = 1;
502 }
503
504 ocfs2_unlock_refcount_tree(osb, tree, rw);
505 /*
506 * We get an extra reference when we create the refcount
507 * tree, so another put will destroy it.
508 */
509 if (delete_tree)
510 ocfs2_refcount_tree_put(tree);
511 brelse(ref_root_bh);
512 ref_root_bh = NULL;
513 goto again;
514 }
515
516 *ret_tree = tree;
517 if (ref_bh) {
518 *ref_bh = ref_root_bh;
519 ref_root_bh = NULL;
520 }
521 out:
522 brelse(ref_root_bh);
523 return ret;
524 }
525
526 void ocfs2_unlock_refcount_tree(struct ocfs2_super *osb,
527 struct ocfs2_refcount_tree *tree, int rw)
528 {
529 if (rw)
530 up_write(&tree->rf_sem);
531 else
532 up_read(&tree->rf_sem);
533
534 ocfs2_refcount_unlock(tree, rw);
535 ocfs2_refcount_tree_put(tree);
536 }
537
538 void ocfs2_purge_refcount_trees(struct ocfs2_super *osb)
539 {
540 struct rb_node *node;
541 struct ocfs2_refcount_tree *tree;
542 struct rb_root *root = &osb->osb_rf_lock_tree;
543
544 while ((node = rb_last(root)) != NULL) {
545 tree = rb_entry(node, struct ocfs2_refcount_tree, rf_node);
546
547 trace_ocfs2_purge_refcount_trees(
548 (unsigned long long) tree->rf_blkno);
549
550 rb_erase(&tree->rf_node, root);
551 ocfs2_free_refcount_tree(tree);
552 }
553 }
554
555 /*
556 * Create a refcount tree for an inode.
557 * We take for granted that the inode is already locked.
558 */
559 static int ocfs2_create_refcount_tree(struct inode *inode,
560 struct buffer_head *di_bh)
561 {
562 int ret;
563 handle_t *handle = NULL;
564 struct ocfs2_alloc_context *meta_ac = NULL;
565 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
566 struct ocfs2_inode_info *oi = OCFS2_I(inode);
567 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
568 struct buffer_head *new_bh = NULL;
569 struct ocfs2_refcount_block *rb;
570 struct ocfs2_refcount_tree *new_tree = NULL, *tree = NULL;
571 u16 suballoc_bit_start;
572 u32 num_got;
573 u64 suballoc_loc, first_blkno;
574
575 BUG_ON(oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL);
576
577 trace_ocfs2_create_refcount_tree(
578 (unsigned long long)OCFS2_I(inode)->ip_blkno);
579
580 ret = ocfs2_reserve_new_metadata_blocks(osb, 1, &meta_ac);
581 if (ret) {
582 mlog_errno(ret);
583 goto out;
584 }
585
586 handle = ocfs2_start_trans(osb, OCFS2_REFCOUNT_TREE_CREATE_CREDITS);
587 if (IS_ERR(handle)) {
588 ret = PTR_ERR(handle);
589 mlog_errno(ret);
590 goto out;
591 }
592
593 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
594 OCFS2_JOURNAL_ACCESS_WRITE);
595 if (ret) {
596 mlog_errno(ret);
597 goto out_commit;
598 }
599
600 ret = ocfs2_claim_metadata(handle, meta_ac, 1, &suballoc_loc,
601 &suballoc_bit_start, &num_got,
602 &first_blkno);
603 if (ret) {
604 mlog_errno(ret);
605 goto out_commit;
606 }
607
608 new_tree = ocfs2_allocate_refcount_tree(osb, first_blkno);
609 if (!new_tree) {
610 ret = -ENOMEM;
611 mlog_errno(ret);
612 goto out_commit;
613 }
614
615 new_bh = sb_getblk(inode->i_sb, first_blkno);
616 ocfs2_set_new_buffer_uptodate(&new_tree->rf_ci, new_bh);
617
618 ret = ocfs2_journal_access_rb(handle, &new_tree->rf_ci, new_bh,
619 OCFS2_JOURNAL_ACCESS_CREATE);
620 if (ret) {
621 mlog_errno(ret);
622 goto out_commit;
623 }
624
625 /* Initialize ocfs2_refcount_block. */
626 rb = (struct ocfs2_refcount_block *)new_bh->b_data;
627 memset(rb, 0, inode->i_sb->s_blocksize);
628 strcpy((void *)rb, OCFS2_REFCOUNT_BLOCK_SIGNATURE);
629 rb->rf_suballoc_slot = cpu_to_le16(meta_ac->ac_alloc_slot);
630 rb->rf_suballoc_loc = cpu_to_le64(suballoc_loc);
631 rb->rf_suballoc_bit = cpu_to_le16(suballoc_bit_start);
632 rb->rf_fs_generation = cpu_to_le32(osb->fs_generation);
633 rb->rf_blkno = cpu_to_le64(first_blkno);
634 rb->rf_count = cpu_to_le32(1);
635 rb->rf_records.rl_count =
636 cpu_to_le16(ocfs2_refcount_recs_per_rb(osb->sb));
637 spin_lock(&osb->osb_lock);
638 rb->rf_generation = osb->s_next_generation++;
639 spin_unlock(&osb->osb_lock);
640
641 ocfs2_journal_dirty(handle, new_bh);
642
643 spin_lock(&oi->ip_lock);
644 oi->ip_dyn_features |= OCFS2_HAS_REFCOUNT_FL;
645 di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
646 di->i_refcount_loc = cpu_to_le64(first_blkno);
647 spin_unlock(&oi->ip_lock);
648
649 trace_ocfs2_create_refcount_tree_blkno((unsigned long long)first_blkno);
650
651 ocfs2_journal_dirty(handle, di_bh);
652
653 /*
654 * We have to init the tree lock here since it will use
655 * the generation number to create it.
656 */
657 new_tree->rf_generation = le32_to_cpu(rb->rf_generation);
658 ocfs2_init_refcount_tree_lock(osb, new_tree, first_blkno,
659 new_tree->rf_generation);
660
661 spin_lock(&osb->osb_lock);
662 tree = ocfs2_find_refcount_tree(osb, first_blkno);
663
664 /*
665 * We've just created a new refcount tree in this block. If
666 * we found a refcount tree on the ocfs2_super, it must be
667 * one we just deleted. We free the old tree before
668 * inserting the new tree.
669 */
670 BUG_ON(tree && tree->rf_generation == new_tree->rf_generation);
671 if (tree)
672 ocfs2_erase_refcount_tree_from_list_no_lock(osb, tree);
673 ocfs2_insert_refcount_tree(osb, new_tree);
674 spin_unlock(&osb->osb_lock);
675 new_tree = NULL;
676 if (tree)
677 ocfs2_refcount_tree_put(tree);
678
679 out_commit:
680 ocfs2_commit_trans(osb, handle);
681
682 out:
683 if (new_tree) {
684 ocfs2_metadata_cache_exit(&new_tree->rf_ci);
685 kfree(new_tree);
686 }
687
688 brelse(new_bh);
689 if (meta_ac)
690 ocfs2_free_alloc_context(meta_ac);
691
692 return ret;
693 }
694
695 static int ocfs2_set_refcount_tree(struct inode *inode,
696 struct buffer_head *di_bh,
697 u64 refcount_loc)
698 {
699 int ret;
700 handle_t *handle = NULL;
701 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
702 struct ocfs2_inode_info *oi = OCFS2_I(inode);
703 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
704 struct buffer_head *ref_root_bh = NULL;
705 struct ocfs2_refcount_block *rb;
706 struct ocfs2_refcount_tree *ref_tree;
707
708 BUG_ON(oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL);
709
710 ret = ocfs2_lock_refcount_tree(osb, refcount_loc, 1,
711 &ref_tree, &ref_root_bh);
712 if (ret) {
713 mlog_errno(ret);
714 return ret;
715 }
716
717 handle = ocfs2_start_trans(osb, OCFS2_REFCOUNT_TREE_SET_CREDITS);
718 if (IS_ERR(handle)) {
719 ret = PTR_ERR(handle);
720 mlog_errno(ret);
721 goto out;
722 }
723
724 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
725 OCFS2_JOURNAL_ACCESS_WRITE);
726 if (ret) {
727 mlog_errno(ret);
728 goto out_commit;
729 }
730
731 ret = ocfs2_journal_access_rb(handle, &ref_tree->rf_ci, ref_root_bh,
732 OCFS2_JOURNAL_ACCESS_WRITE);
733 if (ret) {
734 mlog_errno(ret);
735 goto out_commit;
736 }
737
738 rb = (struct ocfs2_refcount_block *)ref_root_bh->b_data;
739 le32_add_cpu(&rb->rf_count, 1);
740
741 ocfs2_journal_dirty(handle, ref_root_bh);
742
743 spin_lock(&oi->ip_lock);
744 oi->ip_dyn_features |= OCFS2_HAS_REFCOUNT_FL;
745 di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
746 di->i_refcount_loc = cpu_to_le64(refcount_loc);
747 spin_unlock(&oi->ip_lock);
748 ocfs2_journal_dirty(handle, di_bh);
749
750 out_commit:
751 ocfs2_commit_trans(osb, handle);
752 out:
753 ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
754 brelse(ref_root_bh);
755
756 return ret;
757 }
758
759 int ocfs2_remove_refcount_tree(struct inode *inode, struct buffer_head *di_bh)
760 {
761 int ret, delete_tree = 0;
762 handle_t *handle = NULL;
763 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
764 struct ocfs2_inode_info *oi = OCFS2_I(inode);
765 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
766 struct ocfs2_refcount_block *rb;
767 struct inode *alloc_inode = NULL;
768 struct buffer_head *alloc_bh = NULL;
769 struct buffer_head *blk_bh = NULL;
770 struct ocfs2_refcount_tree *ref_tree;
771 int credits = OCFS2_REFCOUNT_TREE_REMOVE_CREDITS;
772 u64 blk = 0, bg_blkno = 0, ref_blkno = le64_to_cpu(di->i_refcount_loc);
773 u16 bit = 0;
774
775 if (!(oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL))
776 return 0;
777
778 BUG_ON(!ref_blkno);
779 ret = ocfs2_lock_refcount_tree(osb, ref_blkno, 1, &ref_tree, &blk_bh);
780 if (ret) {
781 mlog_errno(ret);
782 return ret;
783 }
784
785 rb = (struct ocfs2_refcount_block *)blk_bh->b_data;
786
787 /*
788 * If we are the last user, we need to free the block.
789 * So lock the allocator ahead.
790 */
791 if (le32_to_cpu(rb->rf_count) == 1) {
792 blk = le64_to_cpu(rb->rf_blkno);
793 bit = le16_to_cpu(rb->rf_suballoc_bit);
794 if (rb->rf_suballoc_loc)
795 bg_blkno = le64_to_cpu(rb->rf_suballoc_loc);
796 else
797 bg_blkno = ocfs2_which_suballoc_group(blk, bit);
798
799 alloc_inode = ocfs2_get_system_file_inode(osb,
800 EXTENT_ALLOC_SYSTEM_INODE,
801 le16_to_cpu(rb->rf_suballoc_slot));
802 if (!alloc_inode) {
803 ret = -ENOMEM;
804 mlog_errno(ret);
805 goto out;
806 }
807 mutex_lock(&alloc_inode->i_mutex);
808
809 ret = ocfs2_inode_lock(alloc_inode, &alloc_bh, 1);
810 if (ret) {
811 mlog_errno(ret);
812 goto out_mutex;
813 }
814
815 credits += OCFS2_SUBALLOC_FREE;
816 }
817
818 handle = ocfs2_start_trans(osb, credits);
819 if (IS_ERR(handle)) {
820 ret = PTR_ERR(handle);
821 mlog_errno(ret);
822 goto out_unlock;
823 }
824
825 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
826 OCFS2_JOURNAL_ACCESS_WRITE);
827 if (ret) {
828 mlog_errno(ret);
829 goto out_commit;
830 }
831
832 ret = ocfs2_journal_access_rb(handle, &ref_tree->rf_ci, blk_bh,
833 OCFS2_JOURNAL_ACCESS_WRITE);
834 if (ret) {
835 mlog_errno(ret);
836 goto out_commit;
837 }
838
839 spin_lock(&oi->ip_lock);
840 oi->ip_dyn_features &= ~OCFS2_HAS_REFCOUNT_FL;
841 di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
842 di->i_refcount_loc = 0;
843 spin_unlock(&oi->ip_lock);
844 ocfs2_journal_dirty(handle, di_bh);
845
846 le32_add_cpu(&rb->rf_count , -1);
847 ocfs2_journal_dirty(handle, blk_bh);
848
849 if (!rb->rf_count) {
850 delete_tree = 1;
851 ocfs2_erase_refcount_tree_from_list(osb, ref_tree);
852 ret = ocfs2_free_suballoc_bits(handle, alloc_inode,
853 alloc_bh, bit, bg_blkno, 1);
854 if (ret)
855 mlog_errno(ret);
856 }
857
858 out_commit:
859 ocfs2_commit_trans(osb, handle);
860 out_unlock:
861 if (alloc_inode) {
862 ocfs2_inode_unlock(alloc_inode, 1);
863 brelse(alloc_bh);
864 }
865 out_mutex:
866 if (alloc_inode) {
867 mutex_unlock(&alloc_inode->i_mutex);
868 iput(alloc_inode);
869 }
870 out:
871 ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
872 if (delete_tree)
873 ocfs2_refcount_tree_put(ref_tree);
874 brelse(blk_bh);
875
876 return ret;
877 }
878
879 static void ocfs2_find_refcount_rec_in_rl(struct ocfs2_caching_info *ci,
880 struct buffer_head *ref_leaf_bh,
881 u64 cpos, unsigned int len,
882 struct ocfs2_refcount_rec *ret_rec,
883 int *index)
884 {
885 int i = 0;
886 struct ocfs2_refcount_block *rb =
887 (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
888 struct ocfs2_refcount_rec *rec = NULL;
889
890 for (; i < le16_to_cpu(rb->rf_records.rl_used); i++) {
891 rec = &rb->rf_records.rl_recs[i];
892
893 if (le64_to_cpu(rec->r_cpos) +
894 le32_to_cpu(rec->r_clusters) <= cpos)
895 continue;
896 else if (le64_to_cpu(rec->r_cpos) > cpos)
897 break;
898
899 /* ok, cpos fail in this rec. Just return. */
900 if (ret_rec)
901 *ret_rec = *rec;
902 goto out;
903 }
904
905 if (ret_rec) {
906 /* We meet with a hole here, so fake the rec. */
907 ret_rec->r_cpos = cpu_to_le64(cpos);
908 ret_rec->r_refcount = 0;
909 if (i < le16_to_cpu(rb->rf_records.rl_used) &&
910 le64_to_cpu(rec->r_cpos) < cpos + len)
911 ret_rec->r_clusters =
912 cpu_to_le32(le64_to_cpu(rec->r_cpos) - cpos);
913 else
914 ret_rec->r_clusters = cpu_to_le32(len);
915 }
916
917 out:
918 *index = i;
919 }
920
921 /*
922 * Try to remove refcount tree. The mechanism is:
923 * 1) Check whether i_clusters == 0, if no, exit.
924 * 2) check whether we have i_xattr_loc in dinode. if yes, exit.
925 * 3) Check whether we have inline xattr stored outside, if yes, exit.
926 * 4) Remove the tree.
927 */
928 int ocfs2_try_remove_refcount_tree(struct inode *inode,
929 struct buffer_head *di_bh)
930 {
931 int ret;
932 struct ocfs2_inode_info *oi = OCFS2_I(inode);
933 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
934
935 down_write(&oi->ip_xattr_sem);
936 down_write(&oi->ip_alloc_sem);
937
938 if (oi->ip_clusters)
939 goto out;
940
941 if ((oi->ip_dyn_features & OCFS2_HAS_XATTR_FL) && di->i_xattr_loc)
942 goto out;
943
944 if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL &&
945 ocfs2_has_inline_xattr_value_outside(inode, di))
946 goto out;
947
948 ret = ocfs2_remove_refcount_tree(inode, di_bh);
949 if (ret)
950 mlog_errno(ret);
951 out:
952 up_write(&oi->ip_alloc_sem);
953 up_write(&oi->ip_xattr_sem);
954 return 0;
955 }
956
957 /*
958 * Find the end range for a leaf refcount block indicated by
959 * el->l_recs[index].e_blkno.
960 */
961 static int ocfs2_get_refcount_cpos_end(struct ocfs2_caching_info *ci,
962 struct buffer_head *ref_root_bh,
963 struct ocfs2_extent_block *eb,
964 struct ocfs2_extent_list *el,
965 int index, u32 *cpos_end)
966 {
967 int ret, i, subtree_root;
968 u32 cpos;
969 u64 blkno;
970 struct super_block *sb = ocfs2_metadata_cache_get_super(ci);
971 struct ocfs2_path *left_path = NULL, *right_path = NULL;
972 struct ocfs2_extent_tree et;
973 struct ocfs2_extent_list *tmp_el;
974
975 if (index < le16_to_cpu(el->l_next_free_rec) - 1) {
976 /*
977 * We have a extent rec after index, so just use the e_cpos
978 * of the next extent rec.
979 */
980 *cpos_end = le32_to_cpu(el->l_recs[index+1].e_cpos);
981 return 0;
982 }
983
984 if (!eb || (eb && !eb->h_next_leaf_blk)) {
985 /*
986 * We are the last extent rec, so any high cpos should
987 * be stored in this leaf refcount block.
988 */
989 *cpos_end = UINT_MAX;
990 return 0;
991 }
992
993 /*
994 * If the extent block isn't the last one, we have to find
995 * the subtree root between this extent block and the next
996 * leaf extent block and get the corresponding e_cpos from
997 * the subroot. Otherwise we may corrupt the b-tree.
998 */
999 ocfs2_init_refcount_extent_tree(&et, ci, ref_root_bh);
1000
1001 left_path = ocfs2_new_path_from_et(&et);
1002 if (!left_path) {
1003 ret = -ENOMEM;
1004 mlog_errno(ret);
1005 goto out;
1006 }
1007
1008 cpos = le32_to_cpu(eb->h_list.l_recs[index].e_cpos);
1009 ret = ocfs2_find_path(ci, left_path, cpos);
1010 if (ret) {
1011 mlog_errno(ret);
1012 goto out;
1013 }
1014
1015 right_path = ocfs2_new_path_from_path(left_path);
1016 if (!right_path) {
1017 ret = -ENOMEM;
1018 mlog_errno(ret);
1019 goto out;
1020 }
1021
1022 ret = ocfs2_find_cpos_for_right_leaf(sb, left_path, &cpos);
1023 if (ret) {
1024 mlog_errno(ret);
1025 goto out;
1026 }
1027
1028 ret = ocfs2_find_path(ci, right_path, cpos);
1029 if (ret) {
1030 mlog_errno(ret);
1031 goto out;
1032 }
1033
1034 subtree_root = ocfs2_find_subtree_root(&et, left_path,
1035 right_path);
1036
1037 tmp_el = left_path->p_node[subtree_root].el;
1038 blkno = left_path->p_node[subtree_root+1].bh->b_blocknr;
1039 for (i = 0; i < le16_to_cpu(tmp_el->l_next_free_rec); i++) {
1040 if (le64_to_cpu(tmp_el->l_recs[i].e_blkno) == blkno) {
1041 *cpos_end = le32_to_cpu(tmp_el->l_recs[i+1].e_cpos);
1042 break;
1043 }
1044 }
1045
1046 BUG_ON(i == le16_to_cpu(tmp_el->l_next_free_rec));
1047
1048 out:
1049 ocfs2_free_path(left_path);
1050 ocfs2_free_path(right_path);
1051 return ret;
1052 }
1053
1054 /*
1055 * Given a cpos and len, try to find the refcount record which contains cpos.
1056 * 1. If cpos can be found in one refcount record, return the record.
1057 * 2. If cpos can't be found, return a fake record which start from cpos
1058 * and end at a small value between cpos+len and start of the next record.
1059 * This fake record has r_refcount = 0.
1060 */
1061 static int ocfs2_get_refcount_rec(struct ocfs2_caching_info *ci,
1062 struct buffer_head *ref_root_bh,
1063 u64 cpos, unsigned int len,
1064 struct ocfs2_refcount_rec *ret_rec,
1065 int *index,
1066 struct buffer_head **ret_bh)
1067 {
1068 int ret = 0, i, found;
1069 u32 low_cpos, uninitialized_var(cpos_end);
1070 struct ocfs2_extent_list *el;
1071 struct ocfs2_extent_rec *rec = NULL;
1072 struct ocfs2_extent_block *eb = NULL;
1073 struct buffer_head *eb_bh = NULL, *ref_leaf_bh = NULL;
1074 struct super_block *sb = ocfs2_metadata_cache_get_super(ci);
1075 struct ocfs2_refcount_block *rb =
1076 (struct ocfs2_refcount_block *)ref_root_bh->b_data;
1077
1078 if (!(le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL)) {
1079 ocfs2_find_refcount_rec_in_rl(ci, ref_root_bh, cpos, len,
1080 ret_rec, index);
1081 *ret_bh = ref_root_bh;
1082 get_bh(ref_root_bh);
1083 return 0;
1084 }
1085
1086 el = &rb->rf_list;
1087 low_cpos = cpos & OCFS2_32BIT_POS_MASK;
1088
1089 if (el->l_tree_depth) {
1090 ret = ocfs2_find_leaf(ci, el, low_cpos, &eb_bh);
1091 if (ret) {
1092 mlog_errno(ret);
1093 goto out;
1094 }
1095
1096 eb = (struct ocfs2_extent_block *) eb_bh->b_data;
1097 el = &eb->h_list;
1098
1099 if (el->l_tree_depth) {
1100 ocfs2_error(sb,
1101 "refcount tree %llu has non zero tree "
1102 "depth in leaf btree tree block %llu\n",
1103 (unsigned long long)ocfs2_metadata_cache_owner(ci),
1104 (unsigned long long)eb_bh->b_blocknr);
1105 ret = -EROFS;
1106 goto out;
1107 }
1108 }
1109
1110 found = 0;
1111 for (i = le16_to_cpu(el->l_next_free_rec) - 1; i >= 0; i--) {
1112 rec = &el->l_recs[i];
1113
1114 if (le32_to_cpu(rec->e_cpos) <= low_cpos) {
1115 found = 1;
1116 break;
1117 }
1118 }
1119
1120 if (found) {
1121 ret = ocfs2_get_refcount_cpos_end(ci, ref_root_bh,
1122 eb, el, i, &cpos_end);
1123 if (ret) {
1124 mlog_errno(ret);
1125 goto out;
1126 }
1127
1128 if (cpos_end < low_cpos + len)
1129 len = cpos_end - low_cpos;
1130 }
1131
1132 ret = ocfs2_read_refcount_block(ci, le64_to_cpu(rec->e_blkno),
1133 &ref_leaf_bh);
1134 if (ret) {
1135 mlog_errno(ret);
1136 goto out;
1137 }
1138
1139 ocfs2_find_refcount_rec_in_rl(ci, ref_leaf_bh, cpos, len,
1140 ret_rec, index);
1141 *ret_bh = ref_leaf_bh;
1142 out:
1143 brelse(eb_bh);
1144 return ret;
1145 }
1146
1147 enum ocfs2_ref_rec_contig {
1148 REF_CONTIG_NONE = 0,
1149 REF_CONTIG_LEFT,
1150 REF_CONTIG_RIGHT,
1151 REF_CONTIG_LEFTRIGHT,
1152 };
1153
1154 static enum ocfs2_ref_rec_contig
1155 ocfs2_refcount_rec_adjacent(struct ocfs2_refcount_block *rb,
1156 int index)
1157 {
1158 if ((rb->rf_records.rl_recs[index].r_refcount ==
1159 rb->rf_records.rl_recs[index + 1].r_refcount) &&
1160 (le64_to_cpu(rb->rf_records.rl_recs[index].r_cpos) +
1161 le32_to_cpu(rb->rf_records.rl_recs[index].r_clusters) ==
1162 le64_to_cpu(rb->rf_records.rl_recs[index + 1].r_cpos)))
1163 return REF_CONTIG_RIGHT;
1164
1165 return REF_CONTIG_NONE;
1166 }
1167
1168 static enum ocfs2_ref_rec_contig
1169 ocfs2_refcount_rec_contig(struct ocfs2_refcount_block *rb,
1170 int index)
1171 {
1172 enum ocfs2_ref_rec_contig ret = REF_CONTIG_NONE;
1173
1174 if (index < le16_to_cpu(rb->rf_records.rl_used) - 1)
1175 ret = ocfs2_refcount_rec_adjacent(rb, index);
1176
1177 if (index > 0) {
1178 enum ocfs2_ref_rec_contig tmp;
1179
1180 tmp = ocfs2_refcount_rec_adjacent(rb, index - 1);
1181
1182 if (tmp == REF_CONTIG_RIGHT) {
1183 if (ret == REF_CONTIG_RIGHT)
1184 ret = REF_CONTIG_LEFTRIGHT;
1185 else
1186 ret = REF_CONTIG_LEFT;
1187 }
1188 }
1189
1190 return ret;
1191 }
1192
1193 static void ocfs2_rotate_refcount_rec_left(struct ocfs2_refcount_block *rb,
1194 int index)
1195 {
1196 BUG_ON(rb->rf_records.rl_recs[index].r_refcount !=
1197 rb->rf_records.rl_recs[index+1].r_refcount);
1198
1199 le32_add_cpu(&rb->rf_records.rl_recs[index].r_clusters,
1200 le32_to_cpu(rb->rf_records.rl_recs[index+1].r_clusters));
1201
1202 if (index < le16_to_cpu(rb->rf_records.rl_used) - 2)
1203 memmove(&rb->rf_records.rl_recs[index + 1],
1204 &rb->rf_records.rl_recs[index + 2],
1205 sizeof(struct ocfs2_refcount_rec) *
1206 (le16_to_cpu(rb->rf_records.rl_used) - index - 2));
1207
1208 memset(&rb->rf_records.rl_recs[le16_to_cpu(rb->rf_records.rl_used) - 1],
1209 0, sizeof(struct ocfs2_refcount_rec));
1210 le16_add_cpu(&rb->rf_records.rl_used, -1);
1211 }
1212
1213 /*
1214 * Merge the refcount rec if we are contiguous with the adjacent recs.
1215 */
1216 static void ocfs2_refcount_rec_merge(struct ocfs2_refcount_block *rb,
1217 int index)
1218 {
1219 enum ocfs2_ref_rec_contig contig =
1220 ocfs2_refcount_rec_contig(rb, index);
1221
1222 if (contig == REF_CONTIG_NONE)
1223 return;
1224
1225 if (contig == REF_CONTIG_LEFT || contig == REF_CONTIG_LEFTRIGHT) {
1226 BUG_ON(index == 0);
1227 index--;
1228 }
1229
1230 ocfs2_rotate_refcount_rec_left(rb, index);
1231
1232 if (contig == REF_CONTIG_LEFTRIGHT)
1233 ocfs2_rotate_refcount_rec_left(rb, index);
1234 }
1235
1236 /*
1237 * Change the refcount indexed by "index" in ref_bh.
1238 * If refcount reaches 0, remove it.
1239 */
1240 static int ocfs2_change_refcount_rec(handle_t *handle,
1241 struct ocfs2_caching_info *ci,
1242 struct buffer_head *ref_leaf_bh,
1243 int index, int merge, int change)
1244 {
1245 int ret;
1246 struct ocfs2_refcount_block *rb =
1247 (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
1248 struct ocfs2_refcount_list *rl = &rb->rf_records;
1249 struct ocfs2_refcount_rec *rec = &rl->rl_recs[index];
1250
1251 ret = ocfs2_journal_access_rb(handle, ci, ref_leaf_bh,
1252 OCFS2_JOURNAL_ACCESS_WRITE);
1253 if (ret) {
1254 mlog_errno(ret);
1255 goto out;
1256 }
1257
1258 trace_ocfs2_change_refcount_rec(
1259 (unsigned long long)ocfs2_metadata_cache_owner(ci),
1260 index, le32_to_cpu(rec->r_refcount), change);
1261 le32_add_cpu(&rec->r_refcount, change);
1262
1263 if (!rec->r_refcount) {
1264 if (index != le16_to_cpu(rl->rl_used) - 1) {
1265 memmove(rec, rec + 1,
1266 (le16_to_cpu(rl->rl_used) - index - 1) *
1267 sizeof(struct ocfs2_refcount_rec));
1268 memset(&rl->rl_recs[le16_to_cpu(rl->rl_used) - 1],
1269 0, sizeof(struct ocfs2_refcount_rec));
1270 }
1271
1272 le16_add_cpu(&rl->rl_used, -1);
1273 } else if (merge)
1274 ocfs2_refcount_rec_merge(rb, index);
1275
1276 ocfs2_journal_dirty(handle, ref_leaf_bh);
1277 out:
1278 return ret;
1279 }
1280
1281 static int ocfs2_expand_inline_ref_root(handle_t *handle,
1282 struct ocfs2_caching_info *ci,
1283 struct buffer_head *ref_root_bh,
1284 struct buffer_head **ref_leaf_bh,
1285 struct ocfs2_alloc_context *meta_ac)
1286 {
1287 int ret;
1288 u16 suballoc_bit_start;
1289 u32 num_got;
1290 u64 suballoc_loc, blkno;
1291 struct super_block *sb = ocfs2_metadata_cache_get_super(ci);
1292 struct buffer_head *new_bh = NULL;
1293 struct ocfs2_refcount_block *new_rb;
1294 struct ocfs2_refcount_block *root_rb =
1295 (struct ocfs2_refcount_block *)ref_root_bh->b_data;
1296
1297 ret = ocfs2_journal_access_rb(handle, ci, ref_root_bh,
1298 OCFS2_JOURNAL_ACCESS_WRITE);
1299 if (ret) {
1300 mlog_errno(ret);
1301 goto out;
1302 }
1303
1304 ret = ocfs2_claim_metadata(handle, meta_ac, 1, &suballoc_loc,
1305 &suballoc_bit_start, &num_got,
1306 &blkno);
1307 if (ret) {
1308 mlog_errno(ret);
1309 goto out;
1310 }
1311
1312 new_bh = sb_getblk(sb, blkno);
1313 if (new_bh == NULL) {
1314 ret = -EIO;
1315 mlog_errno(ret);
1316 goto out;
1317 }
1318 ocfs2_set_new_buffer_uptodate(ci, new_bh);
1319
1320 ret = ocfs2_journal_access_rb(handle, ci, new_bh,
1321 OCFS2_JOURNAL_ACCESS_CREATE);
1322 if (ret) {
1323 mlog_errno(ret);
1324 goto out;
1325 }
1326
1327 /*
1328 * Initialize ocfs2_refcount_block.
1329 * It should contain the same information as the old root.
1330 * so just memcpy it and change the corresponding field.
1331 */
1332 memcpy(new_bh->b_data, ref_root_bh->b_data, sb->s_blocksize);
1333
1334 new_rb = (struct ocfs2_refcount_block *)new_bh->b_data;
1335 new_rb->rf_suballoc_slot = cpu_to_le16(meta_ac->ac_alloc_slot);
1336 new_rb->rf_suballoc_loc = cpu_to_le64(suballoc_loc);
1337 new_rb->rf_suballoc_bit = cpu_to_le16(suballoc_bit_start);
1338 new_rb->rf_blkno = cpu_to_le64(blkno);
1339 new_rb->rf_cpos = cpu_to_le32(0);
1340 new_rb->rf_parent = cpu_to_le64(ref_root_bh->b_blocknr);
1341 new_rb->rf_flags = cpu_to_le32(OCFS2_REFCOUNT_LEAF_FL);
1342 ocfs2_journal_dirty(handle, new_bh);
1343
1344 /* Now change the root. */
1345 memset(&root_rb->rf_list, 0, sb->s_blocksize -
1346 offsetof(struct ocfs2_refcount_block, rf_list));
1347 root_rb->rf_list.l_count = cpu_to_le16(ocfs2_extent_recs_per_rb(sb));
1348 root_rb->rf_clusters = cpu_to_le32(1);
1349 root_rb->rf_list.l_next_free_rec = cpu_to_le16(1);
1350 root_rb->rf_list.l_recs[0].e_blkno = cpu_to_le64(blkno);
1351 root_rb->rf_list.l_recs[0].e_leaf_clusters = cpu_to_le16(1);
1352 root_rb->rf_flags = cpu_to_le32(OCFS2_REFCOUNT_TREE_FL);
1353
1354 ocfs2_journal_dirty(handle, ref_root_bh);
1355
1356 trace_ocfs2_expand_inline_ref_root((unsigned long long)blkno,
1357 le16_to_cpu(new_rb->rf_records.rl_used));
1358
1359 *ref_leaf_bh = new_bh;
1360 new_bh = NULL;
1361 out:
1362 brelse(new_bh);
1363 return ret;
1364 }
1365
1366 static int ocfs2_refcount_rec_no_intersect(struct ocfs2_refcount_rec *prev,
1367 struct ocfs2_refcount_rec *next)
1368 {
1369 if (ocfs2_get_ref_rec_low_cpos(prev) + le32_to_cpu(prev->r_clusters) <=
1370 ocfs2_get_ref_rec_low_cpos(next))
1371 return 1;
1372
1373 return 0;
1374 }
1375
1376 static int cmp_refcount_rec_by_low_cpos(const void *a, const void *b)
1377 {
1378 const struct ocfs2_refcount_rec *l = a, *r = b;
1379 u32 l_cpos = ocfs2_get_ref_rec_low_cpos(l);
1380 u32 r_cpos = ocfs2_get_ref_rec_low_cpos(r);
1381
1382 if (l_cpos > r_cpos)
1383 return 1;
1384 if (l_cpos < r_cpos)
1385 return -1;
1386 return 0;
1387 }
1388
1389 static int cmp_refcount_rec_by_cpos(const void *a, const void *b)
1390 {
1391 const struct ocfs2_refcount_rec *l = a, *r = b;
1392 u64 l_cpos = le64_to_cpu(l->r_cpos);
1393 u64 r_cpos = le64_to_cpu(r->r_cpos);
1394
1395 if (l_cpos > r_cpos)
1396 return 1;
1397 if (l_cpos < r_cpos)
1398 return -1;
1399 return 0;
1400 }
1401
1402 static void swap_refcount_rec(void *a, void *b, int size)
1403 {
1404 struct ocfs2_refcount_rec *l = a, *r = b, tmp;
1405
1406 tmp = *(struct ocfs2_refcount_rec *)l;
1407 *(struct ocfs2_refcount_rec *)l =
1408 *(struct ocfs2_refcount_rec *)r;
1409 *(struct ocfs2_refcount_rec *)r = tmp;
1410 }
1411
1412 /*
1413 * The refcount cpos are ordered by their 64bit cpos,
1414 * But we will use the low 32 bit to be the e_cpos in the b-tree.
1415 * So we need to make sure that this pos isn't intersected with others.
1416 *
1417 * Note: The refcount block is already sorted by their low 32 bit cpos,
1418 * So just try the middle pos first, and we will exit when we find
1419 * the good position.
1420 */
1421 static int ocfs2_find_refcount_split_pos(struct ocfs2_refcount_list *rl,
1422 u32 *split_pos, int *split_index)
1423 {
1424 int num_used = le16_to_cpu(rl->rl_used);
1425 int delta, middle = num_used / 2;
1426
1427 for (delta = 0; delta < middle; delta++) {
1428 /* Let's check delta earlier than middle */
1429 if (ocfs2_refcount_rec_no_intersect(
1430 &rl->rl_recs[middle - delta - 1],
1431 &rl->rl_recs[middle - delta])) {
1432 *split_index = middle - delta;
1433 break;
1434 }
1435
1436 /* For even counts, don't walk off the end */
1437 if ((middle + delta + 1) == num_used)
1438 continue;
1439
1440 /* Now try delta past middle */
1441 if (ocfs2_refcount_rec_no_intersect(
1442 &rl->rl_recs[middle + delta],
1443 &rl->rl_recs[middle + delta + 1])) {
1444 *split_index = middle + delta + 1;
1445 break;
1446 }
1447 }
1448
1449 if (delta >= middle)
1450 return -ENOSPC;
1451
1452 *split_pos = ocfs2_get_ref_rec_low_cpos(&rl->rl_recs[*split_index]);
1453 return 0;
1454 }
1455
1456 static int ocfs2_divide_leaf_refcount_block(struct buffer_head *ref_leaf_bh,
1457 struct buffer_head *new_bh,
1458 u32 *split_cpos)
1459 {
1460 int split_index = 0, num_moved, ret;
1461 u32 cpos = 0;
1462 struct ocfs2_refcount_block *rb =
1463 (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
1464 struct ocfs2_refcount_list *rl = &rb->rf_records;
1465 struct ocfs2_refcount_block *new_rb =
1466 (struct ocfs2_refcount_block *)new_bh->b_data;
1467 struct ocfs2_refcount_list *new_rl = &new_rb->rf_records;
1468
1469 trace_ocfs2_divide_leaf_refcount_block(
1470 (unsigned long long)ref_leaf_bh->b_blocknr,
1471 le16_to_cpu(rl->rl_count), le16_to_cpu(rl->rl_used));
1472
1473 /*
1474 * XXX: Improvement later.
1475 * If we know all the high 32 bit cpos is the same, no need to sort.
1476 *
1477 * In order to make the whole process safe, we do:
1478 * 1. sort the entries by their low 32 bit cpos first so that we can
1479 * find the split cpos easily.
1480 * 2. call ocfs2_insert_extent to insert the new refcount block.
1481 * 3. move the refcount rec to the new block.
1482 * 4. sort the entries by their 64 bit cpos.
1483 * 5. dirty the new_rb and rb.
1484 */
1485 sort(&rl->rl_recs, le16_to_cpu(rl->rl_used),
1486 sizeof(struct ocfs2_refcount_rec),
1487 cmp_refcount_rec_by_low_cpos, swap_refcount_rec);
1488
1489 ret = ocfs2_find_refcount_split_pos(rl, &cpos, &split_index);
1490 if (ret) {
1491 mlog_errno(ret);
1492 return ret;
1493 }
1494
1495 new_rb->rf_cpos = cpu_to_le32(cpos);
1496
1497 /* move refcount records starting from split_index to the new block. */
1498 num_moved = le16_to_cpu(rl->rl_used) - split_index;
1499 memcpy(new_rl->rl_recs, &rl->rl_recs[split_index],
1500 num_moved * sizeof(struct ocfs2_refcount_rec));
1501
1502 /*ok, remove the entries we just moved over to the other block. */
1503 memset(&rl->rl_recs[split_index], 0,
1504 num_moved * sizeof(struct ocfs2_refcount_rec));
1505
1506 /* change old and new rl_used accordingly. */
1507 le16_add_cpu(&rl->rl_used, -num_moved);
1508 new_rl->rl_used = cpu_to_le16(num_moved);
1509
1510 sort(&rl->rl_recs, le16_to_cpu(rl->rl_used),
1511 sizeof(struct ocfs2_refcount_rec),
1512 cmp_refcount_rec_by_cpos, swap_refcount_rec);
1513
1514 sort(&new_rl->rl_recs, le16_to_cpu(new_rl->rl_used),
1515 sizeof(struct ocfs2_refcount_rec),
1516 cmp_refcount_rec_by_cpos, swap_refcount_rec);
1517
1518 *split_cpos = cpos;
1519 return 0;
1520 }
1521
1522 static int ocfs2_new_leaf_refcount_block(handle_t *handle,
1523 struct ocfs2_caching_info *ci,
1524 struct buffer_head *ref_root_bh,
1525 struct buffer_head *ref_leaf_bh,
1526 struct ocfs2_alloc_context *meta_ac)
1527 {
1528 int ret;
1529 u16 suballoc_bit_start;
1530 u32 num_got, new_cpos;
1531 u64 suballoc_loc, blkno;
1532 struct super_block *sb = ocfs2_metadata_cache_get_super(ci);
1533 struct ocfs2_refcount_block *root_rb =
1534 (struct ocfs2_refcount_block *)ref_root_bh->b_data;
1535 struct buffer_head *new_bh = NULL;
1536 struct ocfs2_refcount_block *new_rb;
1537 struct ocfs2_extent_tree ref_et;
1538
1539 BUG_ON(!(le32_to_cpu(root_rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL));
1540
1541 ret = ocfs2_journal_access_rb(handle, ci, ref_root_bh,
1542 OCFS2_JOURNAL_ACCESS_WRITE);
1543 if (ret) {
1544 mlog_errno(ret);
1545 goto out;
1546 }
1547
1548 ret = ocfs2_journal_access_rb(handle, ci, ref_leaf_bh,
1549 OCFS2_JOURNAL_ACCESS_WRITE);
1550 if (ret) {
1551 mlog_errno(ret);
1552 goto out;
1553 }
1554
1555 ret = ocfs2_claim_metadata(handle, meta_ac, 1, &suballoc_loc,
1556 &suballoc_bit_start, &num_got,
1557 &blkno);
1558 if (ret) {
1559 mlog_errno(ret);
1560 goto out;
1561 }
1562
1563 new_bh = sb_getblk(sb, blkno);
1564 if (new_bh == NULL) {
1565 ret = -EIO;
1566 mlog_errno(ret);
1567 goto out;
1568 }
1569 ocfs2_set_new_buffer_uptodate(ci, new_bh);
1570
1571 ret = ocfs2_journal_access_rb(handle, ci, new_bh,
1572 OCFS2_JOURNAL_ACCESS_CREATE);
1573 if (ret) {
1574 mlog_errno(ret);
1575 goto out;
1576 }
1577
1578 /* Initialize ocfs2_refcount_block. */
1579 new_rb = (struct ocfs2_refcount_block *)new_bh->b_data;
1580 memset(new_rb, 0, sb->s_blocksize);
1581 strcpy((void *)new_rb, OCFS2_REFCOUNT_BLOCK_SIGNATURE);
1582 new_rb->rf_suballoc_slot = cpu_to_le16(meta_ac->ac_alloc_slot);
1583 new_rb->rf_suballoc_loc = cpu_to_le64(suballoc_loc);
1584 new_rb->rf_suballoc_bit = cpu_to_le16(suballoc_bit_start);
1585 new_rb->rf_fs_generation = cpu_to_le32(OCFS2_SB(sb)->fs_generation);
1586 new_rb->rf_blkno = cpu_to_le64(blkno);
1587 new_rb->rf_parent = cpu_to_le64(ref_root_bh->b_blocknr);
1588 new_rb->rf_flags = cpu_to_le32(OCFS2_REFCOUNT_LEAF_FL);
1589 new_rb->rf_records.rl_count =
1590 cpu_to_le16(ocfs2_refcount_recs_per_rb(sb));
1591 new_rb->rf_generation = root_rb->rf_generation;
1592
1593 ret = ocfs2_divide_leaf_refcount_block(ref_leaf_bh, new_bh, &new_cpos);
1594 if (ret) {
1595 mlog_errno(ret);
1596 goto out;
1597 }
1598
1599 ocfs2_journal_dirty(handle, ref_leaf_bh);
1600 ocfs2_journal_dirty(handle, new_bh);
1601
1602 ocfs2_init_refcount_extent_tree(&ref_et, ci, ref_root_bh);
1603
1604 trace_ocfs2_new_leaf_refcount_block(
1605 (unsigned long long)new_bh->b_blocknr, new_cpos);
1606
1607 /* Insert the new leaf block with the specific offset cpos. */
1608 ret = ocfs2_insert_extent(handle, &ref_et, new_cpos, new_bh->b_blocknr,
1609 1, 0, meta_ac);
1610 if (ret)
1611 mlog_errno(ret);
1612
1613 out:
1614 brelse(new_bh);
1615 return ret;
1616 }
1617
1618 static int ocfs2_expand_refcount_tree(handle_t *handle,
1619 struct ocfs2_caching_info *ci,
1620 struct buffer_head *ref_root_bh,
1621 struct buffer_head *ref_leaf_bh,
1622 struct ocfs2_alloc_context *meta_ac)
1623 {
1624 int ret;
1625 struct buffer_head *expand_bh = NULL;
1626
1627 if (ref_root_bh == ref_leaf_bh) {
1628 /*
1629 * the old root bh hasn't been expanded to a b-tree,
1630 * so expand it first.
1631 */
1632 ret = ocfs2_expand_inline_ref_root(handle, ci, ref_root_bh,
1633 &expand_bh, meta_ac);
1634 if (ret) {
1635 mlog_errno(ret);
1636 goto out;
1637 }
1638 } else {
1639 expand_bh = ref_leaf_bh;
1640 get_bh(expand_bh);
1641 }
1642
1643
1644 /* Now add a new refcount block into the tree.*/
1645 ret = ocfs2_new_leaf_refcount_block(handle, ci, ref_root_bh,
1646 expand_bh, meta_ac);
1647 if (ret)
1648 mlog_errno(ret);
1649 out:
1650 brelse(expand_bh);
1651 return ret;
1652 }
1653
1654 /*
1655 * Adjust the extent rec in b-tree representing ref_leaf_bh.
1656 *
1657 * Only called when we have inserted a new refcount rec at index 0
1658 * which means ocfs2_extent_rec.e_cpos may need some change.
1659 */
1660 static int ocfs2_adjust_refcount_rec(handle_t *handle,
1661 struct ocfs2_caching_info *ci,
1662 struct buffer_head *ref_root_bh,
1663 struct buffer_head *ref_leaf_bh,
1664 struct ocfs2_refcount_rec *rec)
1665 {
1666 int ret = 0, i;
1667 u32 new_cpos, old_cpos;
1668 struct ocfs2_path *path = NULL;
1669 struct ocfs2_extent_tree et;
1670 struct ocfs2_refcount_block *rb =
1671 (struct ocfs2_refcount_block *)ref_root_bh->b_data;
1672 struct ocfs2_extent_list *el;
1673
1674 if (!(le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL))
1675 goto out;
1676
1677 rb = (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
1678 old_cpos = le32_to_cpu(rb->rf_cpos);
1679 new_cpos = le64_to_cpu(rec->r_cpos) & OCFS2_32BIT_POS_MASK;
1680 if (old_cpos <= new_cpos)
1681 goto out;
1682
1683 ocfs2_init_refcount_extent_tree(&et, ci, ref_root_bh);
1684
1685 path = ocfs2_new_path_from_et(&et);
1686 if (!path) {
1687 ret = -ENOMEM;
1688 mlog_errno(ret);
1689 goto out;
1690 }
1691
1692 ret = ocfs2_find_path(ci, path, old_cpos);
1693 if (ret) {
1694 mlog_errno(ret);
1695 goto out;
1696 }
1697
1698 /*
1699 * 2 more credits, one for the leaf refcount block, one for
1700 * the extent block contains the extent rec.
1701 */
1702 ret = ocfs2_extend_trans(handle, 2);
1703 if (ret < 0) {
1704 mlog_errno(ret);
1705 goto out;
1706 }
1707
1708 ret = ocfs2_journal_access_rb(handle, ci, ref_leaf_bh,
1709 OCFS2_JOURNAL_ACCESS_WRITE);
1710 if (ret < 0) {
1711 mlog_errno(ret);
1712 goto out;
1713 }
1714
1715 ret = ocfs2_journal_access_eb(handle, ci, path_leaf_bh(path),
1716 OCFS2_JOURNAL_ACCESS_WRITE);
1717 if (ret < 0) {
1718 mlog_errno(ret);
1719 goto out;
1720 }
1721
1722 /* change the leaf extent block first. */
1723 el = path_leaf_el(path);
1724
1725 for (i = 0; i < le16_to_cpu(el->l_next_free_rec); i++)
1726 if (le32_to_cpu(el->l_recs[i].e_cpos) == old_cpos)
1727 break;
1728
1729 BUG_ON(i == le16_to_cpu(el->l_next_free_rec));
1730
1731 el->l_recs[i].e_cpos = cpu_to_le32(new_cpos);
1732
1733 /* change the r_cpos in the leaf block. */
1734 rb->rf_cpos = cpu_to_le32(new_cpos);
1735
1736 ocfs2_journal_dirty(handle, path_leaf_bh(path));
1737 ocfs2_journal_dirty(handle, ref_leaf_bh);
1738
1739 out:
1740 ocfs2_free_path(path);
1741 return ret;
1742 }
1743
1744 static int ocfs2_insert_refcount_rec(handle_t *handle,
1745 struct ocfs2_caching_info *ci,
1746 struct buffer_head *ref_root_bh,
1747 struct buffer_head *ref_leaf_bh,
1748 struct ocfs2_refcount_rec *rec,
1749 int index, int merge,
1750 struct ocfs2_alloc_context *meta_ac)
1751 {
1752 int ret;
1753 struct ocfs2_refcount_block *rb =
1754 (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
1755 struct ocfs2_refcount_list *rf_list = &rb->rf_records;
1756 struct buffer_head *new_bh = NULL;
1757
1758 BUG_ON(le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL);
1759
1760 if (rf_list->rl_used == rf_list->rl_count) {
1761 u64 cpos = le64_to_cpu(rec->r_cpos);
1762 u32 len = le32_to_cpu(rec->r_clusters);
1763
1764 ret = ocfs2_expand_refcount_tree(handle, ci, ref_root_bh,
1765 ref_leaf_bh, meta_ac);
1766 if (ret) {
1767 mlog_errno(ret);
1768 goto out;
1769 }
1770
1771 ret = ocfs2_get_refcount_rec(ci, ref_root_bh,
1772 cpos, len, NULL, &index,
1773 &new_bh);
1774 if (ret) {
1775 mlog_errno(ret);
1776 goto out;
1777 }
1778
1779 ref_leaf_bh = new_bh;
1780 rb = (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
1781 rf_list = &rb->rf_records;
1782 }
1783
1784 ret = ocfs2_journal_access_rb(handle, ci, ref_leaf_bh,
1785 OCFS2_JOURNAL_ACCESS_WRITE);
1786 if (ret) {
1787 mlog_errno(ret);
1788 goto out;
1789 }
1790
1791 if (index < le16_to_cpu(rf_list->rl_used))
1792 memmove(&rf_list->rl_recs[index + 1],
1793 &rf_list->rl_recs[index],
1794 (le16_to_cpu(rf_list->rl_used) - index) *
1795 sizeof(struct ocfs2_refcount_rec));
1796
1797 trace_ocfs2_insert_refcount_rec(
1798 (unsigned long long)ref_leaf_bh->b_blocknr, index,
1799 (unsigned long long)le64_to_cpu(rec->r_cpos),
1800 le32_to_cpu(rec->r_clusters), le32_to_cpu(rec->r_refcount));
1801
1802 rf_list->rl_recs[index] = *rec;
1803
1804 le16_add_cpu(&rf_list->rl_used, 1);
1805
1806 if (merge)
1807 ocfs2_refcount_rec_merge(rb, index);
1808
1809 ocfs2_journal_dirty(handle, ref_leaf_bh);
1810
1811 if (index == 0) {
1812 ret = ocfs2_adjust_refcount_rec(handle, ci,
1813 ref_root_bh,
1814 ref_leaf_bh, rec);
1815 if (ret)
1816 mlog_errno(ret);
1817 }
1818 out:
1819 brelse(new_bh);
1820 return ret;
1821 }
1822
1823 /*
1824 * Split the refcount_rec indexed by "index" in ref_leaf_bh.
1825 * This is much simple than our b-tree code.
1826 * split_rec is the new refcount rec we want to insert.
1827 * If split_rec->r_refcount > 0, we are changing the refcount(in case we
1828 * increase refcount or decrease a refcount to non-zero).
1829 * If split_rec->r_refcount == 0, we are punching a hole in current refcount
1830 * rec( in case we decrease a refcount to zero).
1831 */
1832 static int ocfs2_split_refcount_rec(handle_t *handle,
1833 struct ocfs2_caching_info *ci,
1834 struct buffer_head *ref_root_bh,
1835 struct buffer_head *ref_leaf_bh,
1836 struct ocfs2_refcount_rec *split_rec,
1837 int index, int merge,
1838 struct ocfs2_alloc_context *meta_ac,
1839 struct ocfs2_cached_dealloc_ctxt *dealloc)
1840 {
1841 int ret, recs_need;
1842 u32 len;
1843 struct ocfs2_refcount_block *rb =
1844 (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
1845 struct ocfs2_refcount_list *rf_list = &rb->rf_records;
1846 struct ocfs2_refcount_rec *orig_rec = &rf_list->rl_recs[index];
1847 struct ocfs2_refcount_rec *tail_rec = NULL;
1848 struct buffer_head *new_bh = NULL;
1849
1850 BUG_ON(le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL);
1851
1852 trace_ocfs2_split_refcount_rec(le64_to_cpu(orig_rec->r_cpos),
1853 le32_to_cpu(orig_rec->r_clusters),
1854 le32_to_cpu(orig_rec->r_refcount),
1855 le64_to_cpu(split_rec->r_cpos),
1856 le32_to_cpu(split_rec->r_clusters),
1857 le32_to_cpu(split_rec->r_refcount));
1858
1859 /*
1860 * If we just need to split the header or tail clusters,
1861 * no more recs are needed, just split is OK.
1862 * Otherwise we at least need one new recs.
1863 */
1864 if (!split_rec->r_refcount &&
1865 (split_rec->r_cpos == orig_rec->r_cpos ||
1866 le64_to_cpu(split_rec->r_cpos) +
1867 le32_to_cpu(split_rec->r_clusters) ==
1868 le64_to_cpu(orig_rec->r_cpos) + le32_to_cpu(orig_rec->r_clusters)))
1869 recs_need = 0;
1870 else
1871 recs_need = 1;
1872
1873 /*
1874 * We need one more rec if we split in the middle and the new rec have
1875 * some refcount in it.
1876 */
1877 if (split_rec->r_refcount &&
1878 (split_rec->r_cpos != orig_rec->r_cpos &&
1879 le64_to_cpu(split_rec->r_cpos) +
1880 le32_to_cpu(split_rec->r_clusters) !=
1881 le64_to_cpu(orig_rec->r_cpos) + le32_to_cpu(orig_rec->r_clusters)))
1882 recs_need++;
1883
1884 /* If the leaf block don't have enough record, expand it. */
1885 if (le16_to_cpu(rf_list->rl_used) + recs_need >
1886 le16_to_cpu(rf_list->rl_count)) {
1887 struct ocfs2_refcount_rec tmp_rec;
1888 u64 cpos = le64_to_cpu(orig_rec->r_cpos);
1889 len = le32_to_cpu(orig_rec->r_clusters);
1890 ret = ocfs2_expand_refcount_tree(handle, ci, ref_root_bh,
1891 ref_leaf_bh, meta_ac);
1892 if (ret) {
1893 mlog_errno(ret);
1894 goto out;
1895 }
1896
1897 /*
1898 * We have to re-get it since now cpos may be moved to
1899 * another leaf block.
1900 */
1901 ret = ocfs2_get_refcount_rec(ci, ref_root_bh,
1902 cpos, len, &tmp_rec, &index,
1903 &new_bh);
1904 if (ret) {
1905 mlog_errno(ret);
1906 goto out;
1907 }
1908
1909 ref_leaf_bh = new_bh;
1910 rb = (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
1911 rf_list = &rb->rf_records;
1912 orig_rec = &rf_list->rl_recs[index];
1913 }
1914
1915 ret = ocfs2_journal_access_rb(handle, ci, ref_leaf_bh,
1916 OCFS2_JOURNAL_ACCESS_WRITE);
1917 if (ret) {
1918 mlog_errno(ret);
1919 goto out;
1920 }
1921
1922 /*
1923 * We have calculated out how many new records we need and store
1924 * in recs_need, so spare enough space first by moving the records
1925 * after "index" to the end.
1926 */
1927 if (index != le16_to_cpu(rf_list->rl_used) - 1)
1928 memmove(&rf_list->rl_recs[index + 1 + recs_need],
1929 &rf_list->rl_recs[index + 1],
1930 (le16_to_cpu(rf_list->rl_used) - index - 1) *
1931 sizeof(struct ocfs2_refcount_rec));
1932
1933 len = (le64_to_cpu(orig_rec->r_cpos) +
1934 le32_to_cpu(orig_rec->r_clusters)) -
1935 (le64_to_cpu(split_rec->r_cpos) +
1936 le32_to_cpu(split_rec->r_clusters));
1937
1938 /*
1939 * If we have "len", the we will split in the tail and move it
1940 * to the end of the space we have just spared.
1941 */
1942 if (len) {
1943 tail_rec = &rf_list->rl_recs[index + recs_need];
1944
1945 memcpy(tail_rec, orig_rec, sizeof(struct ocfs2_refcount_rec));
1946 le64_add_cpu(&tail_rec->r_cpos,
1947 le32_to_cpu(tail_rec->r_clusters) - len);
1948 tail_rec->r_clusters = cpu_to_le32(len);
1949 }
1950
1951 /*
1952 * If the split pos isn't the same as the original one, we need to
1953 * split in the head.
1954 *
1955 * Note: We have the chance that split_rec.r_refcount = 0,
1956 * recs_need = 0 and len > 0, which means we just cut the head from
1957 * the orig_rec and in that case we have done some modification in
1958 * orig_rec above, so the check for r_cpos is faked.
1959 */
1960 if (split_rec->r_cpos != orig_rec->r_cpos && tail_rec != orig_rec) {
1961 len = le64_to_cpu(split_rec->r_cpos) -
1962 le64_to_cpu(orig_rec->r_cpos);
1963 orig_rec->r_clusters = cpu_to_le32(len);
1964 index++;
1965 }
1966
1967 le16_add_cpu(&rf_list->rl_used, recs_need);
1968
1969 if (split_rec->r_refcount) {
1970 rf_list->rl_recs[index] = *split_rec;
1971 trace_ocfs2_split_refcount_rec_insert(
1972 (unsigned long long)ref_leaf_bh->b_blocknr, index,
1973 (unsigned long long)le64_to_cpu(split_rec->r_cpos),
1974 le32_to_cpu(split_rec->r_clusters),
1975 le32_to_cpu(split_rec->r_refcount));
1976
1977 if (merge)
1978 ocfs2_refcount_rec_merge(rb, index);
1979 }
1980
1981 ocfs2_journal_dirty(handle, ref_leaf_bh);
1982
1983 out:
1984 brelse(new_bh);
1985 return ret;
1986 }
1987
1988 static int __ocfs2_increase_refcount(handle_t *handle,
1989 struct ocfs2_caching_info *ci,
1990 struct buffer_head *ref_root_bh,
1991 u64 cpos, u32 len, int merge,
1992 struct ocfs2_alloc_context *meta_ac,
1993 struct ocfs2_cached_dealloc_ctxt *dealloc)
1994 {
1995 int ret = 0, index;
1996 struct buffer_head *ref_leaf_bh = NULL;
1997 struct ocfs2_refcount_rec rec;
1998 unsigned int set_len = 0;
1999
2000 trace_ocfs2_increase_refcount_begin(
2001 (unsigned long long)ocfs2_metadata_cache_owner(ci),
2002 (unsigned long long)cpos, len);
2003
2004 while (len) {
2005 ret = ocfs2_get_refcount_rec(ci, ref_root_bh,
2006 cpos, len, &rec, &index,
2007 &ref_leaf_bh);
2008 if (ret) {
2009 mlog_errno(ret);
2010 goto out;
2011 }
2012
2013 set_len = le32_to_cpu(rec.r_clusters);
2014
2015 /*
2016 * Here we may meet with 3 situations:
2017 *
2018 * 1. If we find an already existing record, and the length
2019 * is the same, cool, we just need to increase the r_refcount
2020 * and it is OK.
2021 * 2. If we find a hole, just insert it with r_refcount = 1.
2022 * 3. If we are in the middle of one extent record, split
2023 * it.
2024 */
2025 if (rec.r_refcount && le64_to_cpu(rec.r_cpos) == cpos &&
2026 set_len <= len) {
2027 trace_ocfs2_increase_refcount_change(
2028 (unsigned long long)cpos, set_len,
2029 le32_to_cpu(rec.r_refcount));
2030 ret = ocfs2_change_refcount_rec(handle, ci,
2031 ref_leaf_bh, index,
2032 merge, 1);
2033 if (ret) {
2034 mlog_errno(ret);
2035 goto out;
2036 }
2037 } else if (!rec.r_refcount) {
2038 rec.r_refcount = cpu_to_le32(1);
2039
2040 trace_ocfs2_increase_refcount_insert(
2041 (unsigned long long)le64_to_cpu(rec.r_cpos),
2042 set_len);
2043 ret = ocfs2_insert_refcount_rec(handle, ci, ref_root_bh,
2044 ref_leaf_bh,
2045 &rec, index,
2046 merge, meta_ac);
2047 if (ret) {
2048 mlog_errno(ret);
2049 goto out;
2050 }
2051 } else {
2052 set_len = min((u64)(cpos + len),
2053 le64_to_cpu(rec.r_cpos) + set_len) - cpos;
2054 rec.r_cpos = cpu_to_le64(cpos);
2055 rec.r_clusters = cpu_to_le32(set_len);
2056 le32_add_cpu(&rec.r_refcount, 1);
2057
2058 trace_ocfs2_increase_refcount_split(
2059 (unsigned long long)le64_to_cpu(rec.r_cpos),
2060 set_len, le32_to_cpu(rec.r_refcount));
2061 ret = ocfs2_split_refcount_rec(handle, ci,
2062 ref_root_bh, ref_leaf_bh,
2063 &rec, index, merge,
2064 meta_ac, dealloc);
2065 if (ret) {
2066 mlog_errno(ret);
2067 goto out;
2068 }
2069 }
2070
2071 cpos += set_len;
2072 len -= set_len;
2073 brelse(ref_leaf_bh);
2074 ref_leaf_bh = NULL;
2075 }
2076
2077 out:
2078 brelse(ref_leaf_bh);
2079 return ret;
2080 }
2081
2082 static int ocfs2_remove_refcount_extent(handle_t *handle,
2083 struct ocfs2_caching_info *ci,
2084 struct buffer_head *ref_root_bh,
2085 struct buffer_head *ref_leaf_bh,
2086 struct ocfs2_alloc_context *meta_ac,
2087 struct ocfs2_cached_dealloc_ctxt *dealloc)
2088 {
2089 int ret;
2090 struct super_block *sb = ocfs2_metadata_cache_get_super(ci);
2091 struct ocfs2_refcount_block *rb =
2092 (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
2093 struct ocfs2_extent_tree et;
2094
2095 BUG_ON(rb->rf_records.rl_used);
2096
2097 trace_ocfs2_remove_refcount_extent(
2098 (unsigned long long)ocfs2_metadata_cache_owner(ci),
2099 (unsigned long long)ref_leaf_bh->b_blocknr,
2100 le32_to_cpu(rb->rf_cpos));
2101
2102 ocfs2_init_refcount_extent_tree(&et, ci, ref_root_bh);
2103 ret = ocfs2_remove_extent(handle, &et, le32_to_cpu(rb->rf_cpos),
2104 1, meta_ac, dealloc);
2105 if (ret) {
2106 mlog_errno(ret);
2107 goto out;
2108 }
2109
2110 ocfs2_remove_from_cache(ci, ref_leaf_bh);
2111
2112 /*
2113 * add the freed block to the dealloc so that it will be freed
2114 * when we run dealloc.
2115 */
2116 ret = ocfs2_cache_block_dealloc(dealloc, EXTENT_ALLOC_SYSTEM_INODE,
2117 le16_to_cpu(rb->rf_suballoc_slot),
2118 le64_to_cpu(rb->rf_suballoc_loc),
2119 le64_to_cpu(rb->rf_blkno),
2120 le16_to_cpu(rb->rf_suballoc_bit));
2121 if (ret) {
2122 mlog_errno(ret);
2123 goto out;
2124 }
2125
2126 ret = ocfs2_journal_access_rb(handle, ci, ref_root_bh,
2127 OCFS2_JOURNAL_ACCESS_WRITE);
2128 if (ret) {
2129 mlog_errno(ret);
2130 goto out;
2131 }
2132
2133 rb = (struct ocfs2_refcount_block *)ref_root_bh->b_data;
2134
2135 le32_add_cpu(&rb->rf_clusters, -1);
2136
2137 /*
2138 * check whether we need to restore the root refcount block if
2139 * there is no leaf extent block at atll.
2140 */
2141 if (!rb->rf_list.l_next_free_rec) {
2142 BUG_ON(rb->rf_clusters);
2143
2144 trace_ocfs2_restore_refcount_block(
2145 (unsigned long long)ref_root_bh->b_blocknr);
2146
2147 rb->rf_flags = 0;
2148 rb->rf_parent = 0;
2149 rb->rf_cpos = 0;
2150 memset(&rb->rf_records, 0, sb->s_blocksize -
2151 offsetof(struct ocfs2_refcount_block, rf_records));
2152 rb->rf_records.rl_count =
2153 cpu_to_le16(ocfs2_refcount_recs_per_rb(sb));
2154 }
2155
2156 ocfs2_journal_dirty(handle, ref_root_bh);
2157
2158 out:
2159 return ret;
2160 }
2161
2162 int ocfs2_increase_refcount(handle_t *handle,
2163 struct ocfs2_caching_info *ci,
2164 struct buffer_head *ref_root_bh,
2165 u64 cpos, u32 len,
2166 struct ocfs2_alloc_context *meta_ac,
2167 struct ocfs2_cached_dealloc_ctxt *dealloc)
2168 {
2169 return __ocfs2_increase_refcount(handle, ci, ref_root_bh,
2170 cpos, len, 1,
2171 meta_ac, dealloc);
2172 }
2173
2174 static int ocfs2_decrease_refcount_rec(handle_t *handle,
2175 struct ocfs2_caching_info *ci,
2176 struct buffer_head *ref_root_bh,
2177 struct buffer_head *ref_leaf_bh,
2178 int index, u64 cpos, unsigned int len,
2179 struct ocfs2_alloc_context *meta_ac,
2180 struct ocfs2_cached_dealloc_ctxt *dealloc)
2181 {
2182 int ret;
2183 struct ocfs2_refcount_block *rb =
2184 (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
2185 struct ocfs2_refcount_rec *rec = &rb->rf_records.rl_recs[index];
2186
2187 BUG_ON(cpos < le64_to_cpu(rec->r_cpos));
2188 BUG_ON(cpos + len >
2189 le64_to_cpu(rec->r_cpos) + le32_to_cpu(rec->r_clusters));
2190
2191 trace_ocfs2_decrease_refcount_rec(
2192 (unsigned long long)ocfs2_metadata_cache_owner(ci),
2193 (unsigned long long)cpos, len);
2194
2195 if (cpos == le64_to_cpu(rec->r_cpos) &&
2196 len == le32_to_cpu(rec->r_clusters))
2197 ret = ocfs2_change_refcount_rec(handle, ci,
2198 ref_leaf_bh, index, 1, -1);
2199 else {
2200 struct ocfs2_refcount_rec split = *rec;
2201 split.r_cpos = cpu_to_le64(cpos);
2202 split.r_clusters = cpu_to_le32(len);
2203
2204 le32_add_cpu(&split.r_refcount, -1);
2205
2206 ret = ocfs2_split_refcount_rec(handle, ci,
2207 ref_root_bh, ref_leaf_bh,
2208 &split, index, 1,
2209 meta_ac, dealloc);
2210 }
2211
2212 if (ret) {
2213 mlog_errno(ret);
2214 goto out;
2215 }
2216
2217 /* Remove the leaf refcount block if it contains no refcount record. */
2218 if (!rb->rf_records.rl_used && ref_leaf_bh != ref_root_bh) {
2219 ret = ocfs2_remove_refcount_extent(handle, ci, ref_root_bh,
2220 ref_leaf_bh, meta_ac,
2221 dealloc);
2222 if (ret)
2223 mlog_errno(ret);
2224 }
2225
2226 out:
2227 return ret;
2228 }
2229
2230 static int __ocfs2_decrease_refcount(handle_t *handle,
2231 struct ocfs2_caching_info *ci,
2232 struct buffer_head *ref_root_bh,
2233 u64 cpos, u32 len,
2234 struct ocfs2_alloc_context *meta_ac,
2235 struct ocfs2_cached_dealloc_ctxt *dealloc,
2236 int delete)
2237 {
2238 int ret = 0, index = 0;
2239 struct ocfs2_refcount_rec rec;
2240 unsigned int r_count = 0, r_len;
2241 struct super_block *sb = ocfs2_metadata_cache_get_super(ci);
2242 struct buffer_head *ref_leaf_bh = NULL;
2243
2244 trace_ocfs2_decrease_refcount(
2245 (unsigned long long)ocfs2_metadata_cache_owner(ci),
2246 (unsigned long long)cpos, len, delete);
2247
2248 while (len) {
2249 ret = ocfs2_get_refcount_rec(ci, ref_root_bh,
2250 cpos, len, &rec, &index,
2251 &ref_leaf_bh);
2252 if (ret) {
2253 mlog_errno(ret);
2254 goto out;
2255 }
2256
2257 r_count = le32_to_cpu(rec.r_refcount);
2258 BUG_ON(r_count == 0);
2259 if (!delete)
2260 BUG_ON(r_count > 1);
2261
2262 r_len = min((u64)(cpos + len), le64_to_cpu(rec.r_cpos) +
2263 le32_to_cpu(rec.r_clusters)) - cpos;
2264
2265 ret = ocfs2_decrease_refcount_rec(handle, ci, ref_root_bh,
2266 ref_leaf_bh, index,
2267 cpos, r_len,
2268 meta_ac, dealloc);
2269 if (ret) {
2270 mlog_errno(ret);
2271 goto out;
2272 }
2273
2274 if (le32_to_cpu(rec.r_refcount) == 1 && delete) {
2275 ret = ocfs2_cache_cluster_dealloc(dealloc,
2276 ocfs2_clusters_to_blocks(sb, cpos),
2277 r_len);
2278 if (ret) {
2279 mlog_errno(ret);
2280 goto out;
2281 }
2282 }
2283
2284 cpos += r_len;
2285 len -= r_len;
2286 brelse(ref_leaf_bh);
2287 ref_leaf_bh = NULL;
2288 }
2289
2290 out:
2291 brelse(ref_leaf_bh);
2292 return ret;
2293 }
2294
2295 /* Caller must hold refcount tree lock. */
2296 int ocfs2_decrease_refcount(struct inode *inode,
2297 handle_t *handle, u32 cpos, u32 len,
2298 struct ocfs2_alloc_context *meta_ac,
2299 struct ocfs2_cached_dealloc_ctxt *dealloc,
2300 int delete)
2301 {
2302 int ret;
2303 u64 ref_blkno;
2304 struct ocfs2_inode_info *oi = OCFS2_I(inode);
2305 struct buffer_head *ref_root_bh = NULL;
2306 struct ocfs2_refcount_tree *tree;
2307
2308 BUG_ON(!(oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL));
2309
2310 ret = ocfs2_get_refcount_block(inode, &ref_blkno);
2311 if (ret) {
2312 mlog_errno(ret);
2313 goto out;
2314 }
2315
2316 ret = ocfs2_get_refcount_tree(OCFS2_SB(inode->i_sb), ref_blkno, &tree);
2317 if (ret) {
2318 mlog_errno(ret);
2319 goto out;
2320 }
2321
2322 ret = ocfs2_read_refcount_block(&tree->rf_ci, tree->rf_blkno,
2323 &ref_root_bh);
2324 if (ret) {
2325 mlog_errno(ret);
2326 goto out;
2327 }
2328
2329 ret = __ocfs2_decrease_refcount(handle, &tree->rf_ci, ref_root_bh,
2330 cpos, len, meta_ac, dealloc, delete);
2331 if (ret)
2332 mlog_errno(ret);
2333 out:
2334 brelse(ref_root_bh);
2335 return ret;
2336 }
2337
2338 /*
2339 * Mark the already-existing extent at cpos as refcounted for len clusters.
2340 * This adds the refcount extent flag.
2341 *
2342 * If the existing extent is larger than the request, initiate a
2343 * split. An attempt will be made at merging with adjacent extents.
2344 *
2345 * The caller is responsible for passing down meta_ac if we'll need it.
2346 */
2347 static int ocfs2_mark_extent_refcounted(struct inode *inode,
2348 struct ocfs2_extent_tree *et,
2349 handle_t *handle, u32 cpos,
2350 u32 len, u32 phys,
2351 struct ocfs2_alloc_context *meta_ac,
2352 struct ocfs2_cached_dealloc_ctxt *dealloc)
2353 {
2354 int ret;
2355
2356 trace_ocfs2_mark_extent_refcounted(OCFS2_I(inode)->ip_blkno,
2357 cpos, len, phys);
2358
2359 if (!ocfs2_refcount_tree(OCFS2_SB(inode->i_sb))) {
2360 ocfs2_error(inode->i_sb, "Inode %lu want to use refcount "
2361 "tree, but the feature bit is not set in the "
2362 "super block.", inode->i_ino);
2363 ret = -EROFS;
2364 goto out;
2365 }
2366
2367 ret = ocfs2_change_extent_flag(handle, et, cpos,
2368 len, phys, meta_ac, dealloc,
2369 OCFS2_EXT_REFCOUNTED, 0);
2370 if (ret)
2371 mlog_errno(ret);
2372
2373 out:
2374 return ret;
2375 }
2376
2377 /*
2378 * Given some contiguous physical clusters, calculate what we need
2379 * for modifying their refcount.
2380 */
2381 static int ocfs2_calc_refcount_meta_credits(struct super_block *sb,
2382 struct ocfs2_caching_info *ci,
2383 struct buffer_head *ref_root_bh,
2384 u64 start_cpos,
2385 u32 clusters,
2386 int *meta_add,
2387 int *credits)
2388 {
2389 int ret = 0, index, ref_blocks = 0, recs_add = 0;
2390 u64 cpos = start_cpos;
2391 struct ocfs2_refcount_block *rb;
2392 struct ocfs2_refcount_rec rec;
2393 struct buffer_head *ref_leaf_bh = NULL, *prev_bh = NULL;
2394 u32 len;
2395
2396 while (clusters) {
2397 ret = ocfs2_get_refcount_rec(ci, ref_root_bh,
2398 cpos, clusters, &rec,
2399 &index, &ref_leaf_bh);
2400 if (ret) {
2401 mlog_errno(ret);
2402 goto out;
2403 }
2404
2405 if (ref_leaf_bh != prev_bh) {
2406 /*
2407 * Now we encounter a new leaf block, so calculate
2408 * whether we need to extend the old leaf.
2409 */
2410 if (prev_bh) {
2411 rb = (struct ocfs2_refcount_block *)
2412 prev_bh->b_data;
2413
2414 if (le16_to_cpu(rb->rf_records.rl_used) +
2415 recs_add >
2416 le16_to_cpu(rb->rf_records.rl_count))
2417 ref_blocks++;
2418 }
2419
2420 recs_add = 0;
2421 *credits += 1;
2422 brelse(prev_bh);
2423 prev_bh = ref_leaf_bh;
2424 get_bh(prev_bh);
2425 }
2426
2427 rb = (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
2428
2429 trace_ocfs2_calc_refcount_meta_credits_iterate(
2430 recs_add, (unsigned long long)cpos, clusters,
2431 (unsigned long long)le64_to_cpu(rec.r_cpos),
2432 le32_to_cpu(rec.r_clusters),
2433 le32_to_cpu(rec.r_refcount), index);
2434
2435 len = min((u64)cpos + clusters, le64_to_cpu(rec.r_cpos) +
2436 le32_to_cpu(rec.r_clusters)) - cpos;
2437 /*
2438 * We record all the records which will be inserted to the
2439 * same refcount block, so that we can tell exactly whether
2440 * we need a new refcount block or not.
2441 *
2442 * If we will insert a new one, this is easy and only happens
2443 * during adding refcounted flag to the extent, so we don't
2444 * have a chance of spliting. We just need one record.
2445 *
2446 * If the refcount rec already exists, that would be a little
2447 * complicated. we may have to:
2448 * 1) split at the beginning if the start pos isn't aligned.
2449 * we need 1 more record in this case.
2450 * 2) split int the end if the end pos isn't aligned.
2451 * we need 1 more record in this case.
2452 * 3) split in the middle because of file system fragmentation.
2453 * we need 2 more records in this case(we can't detect this
2454 * beforehand, so always think of the worst case).
2455 */
2456 if (rec.r_refcount) {
2457 recs_add += 2;
2458 /* Check whether we need a split at the beginning. */
2459 if (cpos == start_cpos &&
2460 cpos != le64_to_cpu(rec.r_cpos))
2461 recs_add++;
2462
2463 /* Check whether we need a split in the end. */
2464 if (cpos + clusters < le64_to_cpu(rec.r_cpos) +
2465 le32_to_cpu(rec.r_clusters))
2466 recs_add++;
2467 } else
2468 recs_add++;
2469
2470 brelse(ref_leaf_bh);
2471 ref_leaf_bh = NULL;
2472 clusters -= len;
2473 cpos += len;
2474 }
2475
2476 if (prev_bh) {
2477 rb = (struct ocfs2_refcount_block *)prev_bh->b_data;
2478
2479 if (le16_to_cpu(rb->rf_records.rl_used) + recs_add >
2480 le16_to_cpu(rb->rf_records.rl_count))
2481 ref_blocks++;
2482
2483 *credits += 1;
2484 }
2485
2486 if (!ref_blocks)
2487 goto out;
2488
2489 *meta_add += ref_blocks;
2490 *credits += ref_blocks;
2491
2492 /*
2493 * So we may need ref_blocks to insert into the tree.
2494 * That also means we need to change the b-tree and add that number
2495 * of records since we never merge them.
2496 * We need one more block for expansion since the new created leaf
2497 * block is also full and needs split.
2498 */
2499 rb = (struct ocfs2_refcount_block *)ref_root_bh->b_data;
2500 if (le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL) {
2501 struct ocfs2_extent_tree et;
2502
2503 ocfs2_init_refcount_extent_tree(&et, ci, ref_root_bh);
2504 *meta_add += ocfs2_extend_meta_needed(et.et_root_el);
2505 *credits += ocfs2_calc_extend_credits(sb,
2506 et.et_root_el,
2507 ref_blocks);
2508 } else {
2509 *credits += OCFS2_EXPAND_REFCOUNT_TREE_CREDITS;
2510 *meta_add += 1;
2511 }
2512
2513 out:
2514
2515 trace_ocfs2_calc_refcount_meta_credits(
2516 (unsigned long long)start_cpos, clusters,
2517 *meta_add, *credits);
2518 brelse(ref_leaf_bh);
2519 brelse(prev_bh);
2520 return ret;
2521 }
2522
2523 /*
2524 * For refcount tree, we will decrease some contiguous clusters
2525 * refcount count, so just go through it to see how many blocks
2526 * we gonna touch and whether we need to create new blocks.
2527 *
2528 * Normally the refcount blocks store these refcount should be
2529 * contiguous also, so that we can get the number easily.
2530 * We will at most add split 2 refcount records and 2 more
2531 * refcount blocks, so just check it in a rough way.
2532 *
2533 * Caller must hold refcount tree lock.
2534 */
2535 int ocfs2_prepare_refcount_change_for_del(struct inode *inode,
2536 u64 refcount_loc,
2537 u64 phys_blkno,
2538 u32 clusters,
2539 int *credits,
2540 int *ref_blocks)
2541 {
2542 int ret;
2543 struct ocfs2_inode_info *oi = OCFS2_I(inode);
2544 struct buffer_head *ref_root_bh = NULL;
2545 struct ocfs2_refcount_tree *tree;
2546 u64 start_cpos = ocfs2_blocks_to_clusters(inode->i_sb, phys_blkno);
2547
2548 if (!ocfs2_refcount_tree(OCFS2_SB(inode->i_sb))) {
2549 ocfs2_error(inode->i_sb, "Inode %lu want to use refcount "
2550 "tree, but the feature bit is not set in the "
2551 "super block.", inode->i_ino);
2552 ret = -EROFS;
2553 goto out;
2554 }
2555
2556 BUG_ON(!(oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL));
2557
2558 ret = ocfs2_get_refcount_tree(OCFS2_SB(inode->i_sb),
2559 refcount_loc, &tree);
2560 if (ret) {
2561 mlog_errno(ret);
2562 goto out;
2563 }
2564
2565 ret = ocfs2_read_refcount_block(&tree->rf_ci, refcount_loc,
2566 &ref_root_bh);
2567 if (ret) {
2568 mlog_errno(ret);
2569 goto out;
2570 }
2571
2572 ret = ocfs2_calc_refcount_meta_credits(inode->i_sb,
2573 &tree->rf_ci,
2574 ref_root_bh,
2575 start_cpos, clusters,
2576 ref_blocks, credits);
2577 if (ret) {
2578 mlog_errno(ret);
2579 goto out;
2580 }
2581
2582 trace_ocfs2_prepare_refcount_change_for_del(*ref_blocks, *credits);
2583
2584 out:
2585 brelse(ref_root_bh);
2586 return ret;
2587 }
2588
2589 #define MAX_CONTIG_BYTES 1048576
2590
2591 static inline unsigned int ocfs2_cow_contig_clusters(struct super_block *sb)
2592 {
2593 return ocfs2_clusters_for_bytes(sb, MAX_CONTIG_BYTES);
2594 }
2595
2596 static inline unsigned int ocfs2_cow_contig_mask(struct super_block *sb)
2597 {
2598 return ~(ocfs2_cow_contig_clusters(sb) - 1);
2599 }
2600
2601 /*
2602 * Given an extent that starts at 'start' and an I/O that starts at 'cpos',
2603 * find an offset (start + (n * contig_clusters)) that is closest to cpos
2604 * while still being less than or equal to it.
2605 *
2606 * The goal is to break the extent at a multiple of contig_clusters.
2607 */
2608 static inline unsigned int ocfs2_cow_align_start(struct super_block *sb,
2609 unsigned int start,
2610 unsigned int cpos)
2611 {
2612 BUG_ON(start > cpos);
2613
2614 return start + ((cpos - start) & ocfs2_cow_contig_mask(sb));
2615 }
2616
2617 /*
2618 * Given a cluster count of len, pad it out so that it is a multiple
2619 * of contig_clusters.
2620 */
2621 static inline unsigned int ocfs2_cow_align_length(struct super_block *sb,
2622 unsigned int len)
2623 {
2624 unsigned int padded =
2625 (len + (ocfs2_cow_contig_clusters(sb) - 1)) &
2626 ocfs2_cow_contig_mask(sb);
2627
2628 /* Did we wrap? */
2629 if (padded < len)
2630 padded = UINT_MAX;
2631
2632 return padded;
2633 }
2634
2635 /*
2636 * Calculate out the start and number of virtual clusters we need to to CoW.
2637 *
2638 * cpos is vitual start cluster position we want to do CoW in a
2639 * file and write_len is the cluster length.
2640 * max_cpos is the place where we want to stop CoW intentionally.
2641 *
2642 * Normal we will start CoW from the beginning of extent record cotaining cpos.
2643 * We try to break up extents on boundaries of MAX_CONTIG_BYTES so that we
2644 * get good I/O from the resulting extent tree.
2645 */
2646 static int ocfs2_refcount_cal_cow_clusters(struct inode *inode,
2647 struct ocfs2_extent_list *el,
2648 u32 cpos,
2649 u32 write_len,
2650 u32 max_cpos,
2651 u32 *cow_start,
2652 u32 *cow_len)
2653 {
2654 int ret = 0;
2655 int tree_height = le16_to_cpu(el->l_tree_depth), i;
2656 struct buffer_head *eb_bh = NULL;
2657 struct ocfs2_extent_block *eb = NULL;
2658 struct ocfs2_extent_rec *rec;
2659 unsigned int want_clusters, rec_end = 0;
2660 int contig_clusters = ocfs2_cow_contig_clusters(inode->i_sb);
2661 int leaf_clusters;
2662
2663 BUG_ON(cpos + write_len > max_cpos);
2664
2665 if (tree_height > 0) {
2666 ret = ocfs2_find_leaf(INODE_CACHE(inode), el, cpos, &eb_bh);
2667 if (ret) {
2668 mlog_errno(ret);
2669 goto out;
2670 }
2671
2672 eb = (struct ocfs2_extent_block *) eb_bh->b_data;
2673 el = &eb->h_list;
2674
2675 if (el->l_tree_depth) {
2676 ocfs2_error(inode->i_sb,
2677 "Inode %lu has non zero tree depth in "
2678 "leaf block %llu\n", inode->i_ino,
2679 (unsigned long long)eb_bh->b_blocknr);
2680 ret = -EROFS;
2681 goto out;
2682 }
2683 }
2684
2685 *cow_len = 0;
2686 for (i = 0; i < le16_to_cpu(el->l_next_free_rec); i++) {
2687 rec = &el->l_recs[i];
2688
2689 if (ocfs2_is_empty_extent(rec)) {
2690 mlog_bug_on_msg(i != 0, "Inode %lu has empty record in "
2691 "index %d\n", inode->i_ino, i);
2692 continue;
2693 }
2694
2695 if (le32_to_cpu(rec->e_cpos) +
2696 le16_to_cpu(rec->e_leaf_clusters) <= cpos)
2697 continue;
2698
2699 if (*cow_len == 0) {
2700 /*
2701 * We should find a refcounted record in the
2702 * first pass.
2703 */
2704 BUG_ON(!(rec->e_flags & OCFS2_EXT_REFCOUNTED));
2705 *cow_start = le32_to_cpu(rec->e_cpos);
2706 }
2707
2708 /*
2709 * If we encounter a hole, a non-refcounted record or
2710 * pass the max_cpos, stop the search.
2711 */
2712 if ((!(rec->e_flags & OCFS2_EXT_REFCOUNTED)) ||
2713 (*cow_len && rec_end != le32_to_cpu(rec->e_cpos)) ||
2714 (max_cpos <= le32_to_cpu(rec->e_cpos)))
2715 break;
2716
2717 leaf_clusters = le16_to_cpu(rec->e_leaf_clusters);
2718 rec_end = le32_to_cpu(rec->e_cpos) + leaf_clusters;
2719 if (rec_end > max_cpos) {
2720 rec_end = max_cpos;
2721 leaf_clusters = rec_end - le32_to_cpu(rec->e_cpos);
2722 }
2723
2724 /*
2725 * How many clusters do we actually need from
2726 * this extent? First we see how many we actually
2727 * need to complete the write. If that's smaller
2728 * than contig_clusters, we try for contig_clusters.
2729 */
2730 if (!*cow_len)
2731 want_clusters = write_len;
2732 else
2733 want_clusters = (cpos + write_len) -
2734 (*cow_start + *cow_len);
2735 if (want_clusters < contig_clusters)
2736 want_clusters = contig_clusters;
2737
2738 /*
2739 * If the write does not cover the whole extent, we
2740 * need to calculate how we're going to split the extent.
2741 * We try to do it on contig_clusters boundaries.
2742 *
2743 * Any extent smaller than contig_clusters will be
2744 * CoWed in its entirety.
2745 */
2746 if (leaf_clusters <= contig_clusters)
2747 *cow_len += leaf_clusters;
2748 else if (*cow_len || (*cow_start == cpos)) {
2749 /*
2750 * This extent needs to be CoW'd from its
2751 * beginning, so all we have to do is compute
2752 * how many clusters to grab. We align
2753 * want_clusters to the edge of contig_clusters
2754 * to get better I/O.
2755 */
2756 want_clusters = ocfs2_cow_align_length(inode->i_sb,
2757 want_clusters);
2758
2759 if (leaf_clusters < want_clusters)
2760 *cow_len += leaf_clusters;
2761 else
2762 *cow_len += want_clusters;
2763 } else if ((*cow_start + contig_clusters) >=
2764 (cpos + write_len)) {
2765 /*
2766 * Breaking off contig_clusters at the front
2767 * of the extent will cover our write. That's
2768 * easy.
2769 */
2770 *cow_len = contig_clusters;
2771 } else if ((rec_end - cpos) <= contig_clusters) {
2772 /*
2773 * Breaking off contig_clusters at the tail of
2774 * this extent will cover cpos.
2775 */
2776 *cow_start = rec_end - contig_clusters;
2777 *cow_len = contig_clusters;
2778 } else if ((rec_end - cpos) <= want_clusters) {
2779 /*
2780 * While we can't fit the entire write in this
2781 * extent, we know that the write goes from cpos
2782 * to the end of the extent. Break that off.
2783 * We try to break it at some multiple of
2784 * contig_clusters from the front of the extent.
2785 * Failing that (ie, cpos is within
2786 * contig_clusters of the front), we'll CoW the
2787 * entire extent.
2788 */
2789 *cow_start = ocfs2_cow_align_start(inode->i_sb,
2790 *cow_start, cpos);
2791 *cow_len = rec_end - *cow_start;
2792 } else {
2793 /*
2794 * Ok, the entire write lives in the middle of
2795 * this extent. Let's try to slice the extent up
2796 * nicely. Optimally, our CoW region starts at
2797 * m*contig_clusters from the beginning of the
2798 * extent and goes for n*contig_clusters,
2799 * covering the entire write.
2800 */
2801 *cow_start = ocfs2_cow_align_start(inode->i_sb,
2802 *cow_start, cpos);
2803
2804 want_clusters = (cpos + write_len) - *cow_start;
2805 want_clusters = ocfs2_cow_align_length(inode->i_sb,
2806 want_clusters);
2807 if (*cow_start + want_clusters <= rec_end)
2808 *cow_len = want_clusters;
2809 else
2810 *cow_len = rec_end - *cow_start;
2811 }
2812
2813 /* Have we covered our entire write yet? */
2814 if ((*cow_start + *cow_len) >= (cpos + write_len))
2815 break;
2816
2817 /*
2818 * If we reach the end of the extent block and don't get enough
2819 * clusters, continue with the next extent block if possible.
2820 */
2821 if (i + 1 == le16_to_cpu(el->l_next_free_rec) &&
2822 eb && eb->h_next_leaf_blk) {
2823 brelse(eb_bh);
2824 eb_bh = NULL;
2825
2826 ret = ocfs2_read_extent_block(INODE_CACHE(inode),
2827 le64_to_cpu(eb->h_next_leaf_blk),
2828 &eb_bh);
2829 if (ret) {
2830 mlog_errno(ret);
2831 goto out;
2832 }
2833
2834 eb = (struct ocfs2_extent_block *) eb_bh->b_data;
2835 el = &eb->h_list;
2836 i = -1;
2837 }
2838 }
2839
2840 out:
2841 brelse(eb_bh);
2842 return ret;
2843 }
2844
2845 /*
2846 * Prepare meta_ac, data_ac and calculate credits when we want to add some
2847 * num_clusters in data_tree "et" and change the refcount for the old
2848 * clusters(starting form p_cluster) in the refcount tree.
2849 *
2850 * Note:
2851 * 1. since we may split the old tree, so we at most will need num_clusters + 2
2852 * more new leaf records.
2853 * 2. In some case, we may not need to reserve new clusters(e.g, reflink), so
2854 * just give data_ac = NULL.
2855 */
2856 static int ocfs2_lock_refcount_allocators(struct super_block *sb,
2857 u32 p_cluster, u32 num_clusters,
2858 struct ocfs2_extent_tree *et,
2859 struct ocfs2_caching_info *ref_ci,
2860 struct buffer_head *ref_root_bh,
2861 struct ocfs2_alloc_context **meta_ac,
2862 struct ocfs2_alloc_context **data_ac,
2863 int *credits)
2864 {
2865 int ret = 0, meta_add = 0;
2866 int num_free_extents = ocfs2_num_free_extents(OCFS2_SB(sb), et);
2867
2868 if (num_free_extents < 0) {
2869 ret = num_free_extents;
2870 mlog_errno(ret);
2871 goto out;
2872 }
2873
2874 if (num_free_extents < num_clusters + 2)
2875 meta_add =
2876 ocfs2_extend_meta_needed(et->et_root_el);
2877
2878 *credits += ocfs2_calc_extend_credits(sb, et->et_root_el,
2879 num_clusters + 2);
2880
2881 ret = ocfs2_calc_refcount_meta_credits(sb, ref_ci, ref_root_bh,
2882 p_cluster, num_clusters,
2883 &meta_add, credits);
2884 if (ret) {
2885 mlog_errno(ret);
2886 goto out;
2887 }
2888
2889 trace_ocfs2_lock_refcount_allocators(meta_add, *credits);
2890 ret = ocfs2_reserve_new_metadata_blocks(OCFS2_SB(sb), meta_add,
2891 meta_ac);
2892 if (ret) {
2893 mlog_errno(ret);
2894 goto out;
2895 }
2896
2897 if (data_ac) {
2898 ret = ocfs2_reserve_clusters(OCFS2_SB(sb), num_clusters,
2899 data_ac);
2900 if (ret)
2901 mlog_errno(ret);
2902 }
2903
2904 out:
2905 if (ret) {
2906 if (*meta_ac) {
2907 ocfs2_free_alloc_context(*meta_ac);
2908 *meta_ac = NULL;
2909 }
2910 }
2911
2912 return ret;
2913 }
2914
2915 static int ocfs2_clear_cow_buffer(handle_t *handle, struct buffer_head *bh)
2916 {
2917 BUG_ON(buffer_dirty(bh));
2918
2919 clear_buffer_mapped(bh);
2920
2921 return 0;
2922 }
2923
2924 int ocfs2_duplicate_clusters_by_page(handle_t *handle,
2925 struct file *file,
2926 u32 cpos, u32 old_cluster,
2927 u32 new_cluster, u32 new_len)
2928 {
2929 int ret = 0, partial;
2930 struct inode *inode = file->f_path.dentry->d_inode;
2931 struct ocfs2_caching_info *ci = INODE_CACHE(inode);
2932 struct super_block *sb = ocfs2_metadata_cache_get_super(ci);
2933 u64 new_block = ocfs2_clusters_to_blocks(sb, new_cluster);
2934 struct page *page;
2935 pgoff_t page_index;
2936 unsigned int from, to, readahead_pages;
2937 loff_t offset, end, map_end;
2938 struct address_space *mapping = inode->i_mapping;
2939
2940 trace_ocfs2_duplicate_clusters_by_page(cpos, old_cluster,
2941 new_cluster, new_len);
2942
2943 readahead_pages =
2944 (ocfs2_cow_contig_clusters(sb) <<
2945 OCFS2_SB(sb)->s_clustersize_bits) >> PAGE_CACHE_SHIFT;
2946 offset = ((loff_t)cpos) << OCFS2_SB(sb)->s_clustersize_bits;
2947 end = offset + (new_len << OCFS2_SB(sb)->s_clustersize_bits);
2948 /*
2949 * We only duplicate pages until we reach the page contains i_size - 1.
2950 * So trim 'end' to i_size.
2951 */
2952 if (end > i_size_read(inode))
2953 end = i_size_read(inode);
2954
2955 while (offset < end) {
2956 page_index = offset >> PAGE_CACHE_SHIFT;
2957 map_end = ((loff_t)page_index + 1) << PAGE_CACHE_SHIFT;
2958 if (map_end > end)
2959 map_end = end;
2960
2961 /* from, to is the offset within the page. */
2962 from = offset & (PAGE_CACHE_SIZE - 1);
2963 to = PAGE_CACHE_SIZE;
2964 if (map_end & (PAGE_CACHE_SIZE - 1))
2965 to = map_end & (PAGE_CACHE_SIZE - 1);
2966
2967 page = find_or_create_page(mapping, page_index, GFP_NOFS);
2968
2969 /*
2970 * In case PAGE_CACHE_SIZE <= CLUSTER_SIZE, This page
2971 * can't be dirtied before we CoW it out.
2972 */
2973 if (PAGE_CACHE_SIZE <= OCFS2_SB(sb)->s_clustersize)
2974 BUG_ON(PageDirty(page));
2975
2976 if (PageReadahead(page)) {
2977 page_cache_async_readahead(mapping,
2978 &file->f_ra, file,
2979 page, page_index,
2980 readahead_pages);
2981 }
2982
2983 if (!PageUptodate(page)) {
2984 ret = block_read_full_page(page, ocfs2_get_block);
2985 if (ret) {
2986 mlog_errno(ret);
2987 goto unlock;
2988 }
2989 lock_page(page);
2990 }
2991
2992 if (page_has_buffers(page)) {
2993 ret = walk_page_buffers(handle, page_buffers(page),
2994 from, to, &partial,
2995 ocfs2_clear_cow_buffer);
2996 if (ret) {
2997 mlog_errno(ret);
2998 goto unlock;
2999 }
3000 }
3001
3002 ocfs2_map_and_dirty_page(inode, handle, from, to,
3003 page, 0, &new_block);
3004 mark_page_accessed(page);
3005 unlock:
3006 unlock_page(page);
3007 page_cache_release(page);
3008 page = NULL;
3009 offset = map_end;
3010 if (ret)
3011 break;
3012 }
3013
3014 return ret;
3015 }
3016
3017 int ocfs2_duplicate_clusters_by_jbd(handle_t *handle,
3018 struct file *file,
3019 u32 cpos, u32 old_cluster,
3020 u32 new_cluster, u32 new_len)
3021 {
3022 int ret = 0;
3023 struct inode *inode = file->f_path.dentry->d_inode;
3024 struct super_block *sb = inode->i_sb;
3025 struct ocfs2_caching_info *ci = INODE_CACHE(inode);
3026 int i, blocks = ocfs2_clusters_to_blocks(sb, new_len);
3027 u64 old_block = ocfs2_clusters_to_blocks(sb, old_cluster);
3028 u64 new_block = ocfs2_clusters_to_blocks(sb, new_cluster);
3029 struct ocfs2_super *osb = OCFS2_SB(sb);
3030 struct buffer_head *old_bh = NULL;
3031 struct buffer_head *new_bh = NULL;
3032
3033 trace_ocfs2_duplicate_clusters_by_page(cpos, old_cluster,
3034 new_cluster, new_len);
3035
3036 for (i = 0; i < blocks; i++, old_block++, new_block++) {
3037 new_bh = sb_getblk(osb->sb, new_block);
3038 if (new_bh == NULL) {
3039 ret = -EIO;
3040 mlog_errno(ret);
3041 break;
3042 }
3043
3044 ocfs2_set_new_buffer_uptodate(ci, new_bh);
3045
3046 ret = ocfs2_read_block(ci, old_block, &old_bh, NULL);
3047 if (ret) {
3048 mlog_errno(ret);
3049 break;
3050 }
3051
3052 ret = ocfs2_journal_access(handle, ci, new_bh,
3053 OCFS2_JOURNAL_ACCESS_CREATE);
3054 if (ret) {
3055 mlog_errno(ret);
3056 break;
3057 }
3058
3059 memcpy(new_bh->b_data, old_bh->b_data, sb->s_blocksize);
3060 ocfs2_journal_dirty(handle, new_bh);
3061
3062 brelse(new_bh);
3063 brelse(old_bh);
3064 new_bh = NULL;
3065 old_bh = NULL;
3066 }
3067
3068 brelse(new_bh);
3069 brelse(old_bh);
3070 return ret;
3071 }
3072
3073 static int ocfs2_clear_ext_refcount(handle_t *handle,
3074 struct ocfs2_extent_tree *et,
3075 u32 cpos, u32 p_cluster, u32 len,
3076 unsigned int ext_flags,
3077 struct ocfs2_alloc_context *meta_ac,
3078 struct ocfs2_cached_dealloc_ctxt *dealloc)
3079 {
3080 int ret, index;
3081 struct ocfs2_extent_rec replace_rec;
3082 struct ocfs2_path *path = NULL;
3083 struct ocfs2_extent_list *el;
3084 struct super_block *sb = ocfs2_metadata_cache_get_super(et->et_ci);
3085 u64 ino = ocfs2_metadata_cache_owner(et->et_ci);
3086
3087 trace_ocfs2_clear_ext_refcount((unsigned long long)ino,
3088 cpos, len, p_cluster, ext_flags);
3089
3090 memset(&replace_rec, 0, sizeof(replace_rec));
3091 replace_rec.e_cpos = cpu_to_le32(cpos);
3092 replace_rec.e_leaf_clusters = cpu_to_le16(len);
3093 replace_rec.e_blkno = cpu_to_le64(ocfs2_clusters_to_blocks(sb,
3094 p_cluster));
3095 replace_rec.e_flags = ext_flags;
3096 replace_rec.e_flags &= ~OCFS2_EXT_REFCOUNTED;
3097
3098 path = ocfs2_new_path_from_et(et);
3099 if (!path) {
3100 ret = -ENOMEM;
3101 mlog_errno(ret);
3102 goto out;
3103 }
3104
3105 ret = ocfs2_find_path(et->et_ci, path, cpos);
3106 if (ret) {
3107 mlog_errno(ret);
3108 goto out;
3109 }
3110
3111 el = path_leaf_el(path);
3112
3113 index = ocfs2_search_extent_list(el, cpos);
3114 if (index == -1 || index >= le16_to_cpu(el->l_next_free_rec)) {
3115 ocfs2_error(sb,
3116 "Inode %llu has an extent at cpos %u which can no "
3117 "longer be found.\n",
3118 (unsigned long long)ino, cpos);
3119 ret = -EROFS;
3120 goto out;
3121 }
3122
3123 ret = ocfs2_split_extent(handle, et, path, index,
3124 &replace_rec, meta_ac, dealloc);
3125 if (ret)
3126 mlog_errno(ret);
3127
3128 out:
3129 ocfs2_free_path(path);
3130 return ret;
3131 }
3132
3133 static int ocfs2_replace_clusters(handle_t *handle,
3134 struct ocfs2_cow_context *context,
3135 u32 cpos, u32 old,
3136 u32 new, u32 len,
3137 unsigned int ext_flags)
3138 {
3139 int ret;
3140 struct ocfs2_caching_info *ci = context->data_et.et_ci;
3141 u64 ino = ocfs2_metadata_cache_owner(ci);
3142
3143 trace_ocfs2_replace_clusters((unsigned long long)ino,
3144 cpos, old, new, len, ext_flags);
3145
3146 /*If the old clusters is unwritten, no need to duplicate. */
3147 if (!(ext_flags & OCFS2_EXT_UNWRITTEN)) {
3148 ret = context->cow_duplicate_clusters(handle, context->file,
3149 cpos, old, new, len);
3150 if (ret) {
3151 mlog_errno(ret);
3152 goto out;
3153 }
3154 }
3155
3156 ret = ocfs2_clear_ext_refcount(handle, &context->data_et,
3157 cpos, new, len, ext_flags,
3158 context->meta_ac, &context->dealloc);
3159 if (ret)
3160 mlog_errno(ret);
3161 out:
3162 return ret;
3163 }
3164
3165 int ocfs2_cow_sync_writeback(struct super_block *sb,
3166 struct inode *inode,
3167 u32 cpos, u32 num_clusters)
3168 {
3169 int ret = 0;
3170 loff_t offset, end, map_end;
3171 pgoff_t page_index;
3172 struct page *page;
3173
3174 if (ocfs2_should_order_data(inode))
3175 return 0;
3176
3177 offset = ((loff_t)cpos) << OCFS2_SB(sb)->s_clustersize_bits;
3178 end = offset + (num_clusters << OCFS2_SB(sb)->s_clustersize_bits);
3179
3180 ret = filemap_fdatawrite_range(inode->i_mapping,
3181 offset, end - 1);
3182 if (ret < 0) {
3183 mlog_errno(ret);
3184 return ret;
3185 }
3186
3187 while (offset < end) {
3188 page_index = offset >> PAGE_CACHE_SHIFT;
3189 map_end = ((loff_t)page_index + 1) << PAGE_CACHE_SHIFT;
3190 if (map_end > end)
3191 map_end = end;
3192
3193 page = find_or_create_page(inode->i_mapping,
3194 page_index, GFP_NOFS);
3195 BUG_ON(!page);
3196
3197 wait_on_page_writeback(page);
3198 if (PageError(page)) {
3199 ret = -EIO;
3200 mlog_errno(ret);
3201 } else
3202 mark_page_accessed(page);
3203
3204 unlock_page(page);
3205 page_cache_release(page);
3206 page = NULL;
3207 offset = map_end;
3208 if (ret)
3209 break;
3210 }
3211
3212 return ret;
3213 }
3214
3215 static int ocfs2_di_get_clusters(struct ocfs2_cow_context *context,
3216 u32 v_cluster, u32 *p_cluster,
3217 u32 *num_clusters,
3218 unsigned int *extent_flags)
3219 {
3220 return ocfs2_get_clusters(context->inode, v_cluster, p_cluster,
3221 num_clusters, extent_flags);
3222 }
3223
3224 static int ocfs2_make_clusters_writable(struct super_block *sb,
3225 struct ocfs2_cow_context *context,
3226 u32 cpos, u32 p_cluster,
3227 u32 num_clusters, unsigned int e_flags)
3228 {
3229 int ret, delete, index, credits = 0;
3230 u32 new_bit, new_len, orig_num_clusters;
3231 unsigned int set_len;
3232 struct ocfs2_super *osb = OCFS2_SB(sb);
3233 handle_t *handle;
3234 struct buffer_head *ref_leaf_bh = NULL;
3235 struct ocfs2_caching_info *ref_ci = &context->ref_tree->rf_ci;
3236 struct ocfs2_refcount_rec rec;
3237
3238 trace_ocfs2_make_clusters_writable(cpos, p_cluster,
3239 num_clusters, e_flags);
3240
3241 ret = ocfs2_lock_refcount_allocators(sb, p_cluster, num_clusters,
3242 &context->data_et,
3243 ref_ci,
3244 context->ref_root_bh,
3245 &context->meta_ac,
3246 &context->data_ac, &credits);
3247 if (ret) {
3248 mlog_errno(ret);
3249 return ret;
3250 }
3251
3252 if (context->post_refcount)
3253 credits += context->post_refcount->credits;
3254
3255 credits += context->extra_credits;
3256 handle = ocfs2_start_trans(osb, credits);
3257 if (IS_ERR(handle)) {
3258 ret = PTR_ERR(handle);
3259 mlog_errno(ret);
3260 goto out;
3261 }
3262
3263 orig_num_clusters = num_clusters;
3264
3265 while (num_clusters) {
3266 ret = ocfs2_get_refcount_rec(ref_ci, context->ref_root_bh,
3267 p_cluster, num_clusters,
3268 &rec, &index, &ref_leaf_bh);
3269 if (ret) {
3270 mlog_errno(ret);
3271 goto out_commit;
3272 }
3273
3274 BUG_ON(!rec.r_refcount);
3275 set_len = min((u64)p_cluster + num_clusters,
3276 le64_to_cpu(rec.r_cpos) +
3277 le32_to_cpu(rec.r_clusters)) - p_cluster;
3278
3279 /*
3280 * There are many different situation here.
3281 * 1. If refcount == 1, remove the flag and don't COW.
3282 * 2. If refcount > 1, allocate clusters.
3283 * Here we may not allocate r_len once at a time, so continue
3284 * until we reach num_clusters.
3285 */
3286 if (le32_to_cpu(rec.r_refcount) == 1) {
3287 delete = 0;
3288 ret = ocfs2_clear_ext_refcount(handle,
3289 &context->data_et,
3290 cpos, p_cluster,
3291 set_len, e_flags,
3292 context->meta_ac,
3293 &context->dealloc);
3294 if (ret) {
3295 mlog_errno(ret);
3296 goto out_commit;
3297 }
3298 } else {
3299 delete = 1;
3300
3301 ret = __ocfs2_claim_clusters(handle,
3302 context->data_ac,
3303 1, set_len,
3304 &new_bit, &new_len);
3305 if (ret) {
3306 mlog_errno(ret);
3307 goto out_commit;
3308 }
3309
3310 ret = ocfs2_replace_clusters(handle, context,
3311 cpos, p_cluster, new_bit,
3312 new_len, e_flags);
3313 if (ret) {
3314 mlog_errno(ret);
3315 goto out_commit;
3316 }
3317 set_len = new_len;
3318 }
3319
3320 ret = __ocfs2_decrease_refcount(handle, ref_ci,
3321 context->ref_root_bh,
3322 p_cluster, set_len,
3323 context->meta_ac,
3324 &context->dealloc, delete);
3325 if (ret) {
3326 mlog_errno(ret);
3327 goto out_commit;
3328 }
3329
3330 cpos += set_len;
3331 p_cluster += set_len;
3332 num_clusters -= set_len;
3333 brelse(ref_leaf_bh);
3334 ref_leaf_bh = NULL;
3335 }
3336
3337 /* handle any post_cow action. */
3338 if (context->post_refcount && context->post_refcount->func) {
3339 ret = context->post_refcount->func(context->inode, handle,
3340 context->post_refcount->para);
3341 if (ret) {
3342 mlog_errno(ret);
3343 goto out_commit;
3344 }
3345 }
3346
3347 /*
3348 * Here we should write the new page out first if we are
3349 * in write-back mode.
3350 */
3351 if (context->get_clusters == ocfs2_di_get_clusters) {
3352 ret = ocfs2_cow_sync_writeback(sb, context->inode, cpos,
3353 orig_num_clusters);
3354 if (ret)
3355 mlog_errno(ret);
3356 }
3357
3358 out_commit:
3359 ocfs2_commit_trans(osb, handle);
3360
3361 out:
3362 if (context->data_ac) {
3363 ocfs2_free_alloc_context(context->data_ac);
3364 context->data_ac = NULL;
3365 }
3366 if (context->meta_ac) {
3367 ocfs2_free_alloc_context(context->meta_ac);
3368 context->meta_ac = NULL;
3369 }
3370 brelse(ref_leaf_bh);
3371
3372 return ret;
3373 }
3374
3375 static int ocfs2_replace_cow(struct ocfs2_cow_context *context)
3376 {
3377 int ret = 0;
3378 struct inode *inode = context->inode;
3379 u32 cow_start = context->cow_start, cow_len = context->cow_len;
3380 u32 p_cluster, num_clusters;
3381 unsigned int ext_flags;
3382 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3383
3384 if (!ocfs2_refcount_tree(OCFS2_SB(inode->i_sb))) {
3385 ocfs2_error(inode->i_sb, "Inode %lu want to use refcount "
3386 "tree, but the feature bit is not set in the "
3387 "super block.", inode->i_ino);
3388 return -EROFS;
3389 }
3390
3391 ocfs2_init_dealloc_ctxt(&context->dealloc);
3392
3393 while (cow_len) {
3394 ret = context->get_clusters(context, cow_start, &p_cluster,
3395 &num_clusters, &ext_flags);
3396 if (ret) {
3397 mlog_errno(ret);
3398 break;
3399 }
3400
3401 BUG_ON(!(ext_flags & OCFS2_EXT_REFCOUNTED));
3402
3403 if (cow_len < num_clusters)
3404 num_clusters = cow_len;
3405
3406 ret = ocfs2_make_clusters_writable(inode->i_sb, context,
3407 cow_start, p_cluster,
3408 num_clusters, ext_flags);
3409 if (ret) {
3410 mlog_errno(ret);
3411 break;
3412 }
3413
3414 cow_len -= num_clusters;
3415 cow_start += num_clusters;
3416 }
3417
3418 if (ocfs2_dealloc_has_cluster(&context->dealloc)) {
3419 ocfs2_schedule_truncate_log_flush(osb, 1);
3420 ocfs2_run_deallocs(osb, &context->dealloc);
3421 }
3422
3423 return ret;
3424 }
3425
3426 static void ocfs2_readahead_for_cow(struct inode *inode,
3427 struct file *file,
3428 u32 start, u32 len)
3429 {
3430 struct address_space *mapping;
3431 pgoff_t index;
3432 unsigned long num_pages;
3433 int cs_bits = OCFS2_SB(inode->i_sb)->s_clustersize_bits;
3434
3435 if (!file)
3436 return;
3437
3438 mapping = file->f_mapping;
3439 num_pages = (len << cs_bits) >> PAGE_CACHE_SHIFT;
3440 if (!num_pages)
3441 num_pages = 1;
3442
3443 index = ((loff_t)start << cs_bits) >> PAGE_CACHE_SHIFT;
3444 page_cache_sync_readahead(mapping, &file->f_ra, file,
3445 index, num_pages);
3446 }
3447
3448 /*
3449 * Starting at cpos, try to CoW write_len clusters. Don't CoW
3450 * past max_cpos. This will stop when it runs into a hole or an
3451 * unrefcounted extent.
3452 */
3453 static int ocfs2_refcount_cow_hunk(struct inode *inode,
3454 struct file *file,
3455 struct buffer_head *di_bh,
3456 u32 cpos, u32 write_len, u32 max_cpos)
3457 {
3458 int ret;
3459 u32 cow_start = 0, cow_len = 0;
3460 struct ocfs2_inode_info *oi = OCFS2_I(inode);
3461 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3462 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
3463 struct buffer_head *ref_root_bh = NULL;
3464 struct ocfs2_refcount_tree *ref_tree;
3465 struct ocfs2_cow_context *context = NULL;
3466
3467 BUG_ON(!(oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL));
3468
3469 ret = ocfs2_refcount_cal_cow_clusters(inode, &di->id2.i_list,
3470 cpos, write_len, max_cpos,
3471 &cow_start, &cow_len);
3472 if (ret) {
3473 mlog_errno(ret);
3474 goto out;
3475 }
3476
3477 trace_ocfs2_refcount_cow_hunk(OCFS2_I(inode)->ip_blkno,
3478 cpos, write_len, max_cpos,
3479 cow_start, cow_len);
3480
3481 BUG_ON(cow_len == 0);
3482
3483 ocfs2_readahead_for_cow(inode, file, cow_start, cow_len);
3484
3485 context = kzalloc(sizeof(struct ocfs2_cow_context), GFP_NOFS);
3486 if (!context) {
3487 ret = -ENOMEM;
3488 mlog_errno(ret);
3489 goto out;
3490 }
3491
3492 ret = ocfs2_lock_refcount_tree(osb, le64_to_cpu(di->i_refcount_loc),
3493 1, &ref_tree, &ref_root_bh);
3494 if (ret) {
3495 mlog_errno(ret);
3496 goto out;
3497 }
3498
3499 context->inode = inode;
3500 context->cow_start = cow_start;
3501 context->cow_len = cow_len;
3502 context->ref_tree = ref_tree;
3503 context->ref_root_bh = ref_root_bh;
3504 context->cow_duplicate_clusters = ocfs2_duplicate_clusters_by_page;
3505 context->get_clusters = ocfs2_di_get_clusters;
3506 context->file = file;
3507
3508 ocfs2_init_dinode_extent_tree(&context->data_et,
3509 INODE_CACHE(inode), di_bh);
3510
3511 ret = ocfs2_replace_cow(context);
3512 if (ret)
3513 mlog_errno(ret);
3514
3515 /*
3516 * truncate the extent map here since no matter whether we meet with
3517 * any error during the action, we shouldn't trust cached extent map
3518 * any more.
3519 */
3520 ocfs2_extent_map_trunc(inode, cow_start);
3521
3522 ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
3523 brelse(ref_root_bh);
3524 out:
3525 kfree(context);
3526 return ret;
3527 }
3528
3529 /*
3530 * CoW any and all clusters between cpos and cpos+write_len.
3531 * Don't CoW past max_cpos. If this returns successfully, all
3532 * clusters between cpos and cpos+write_len are safe to modify.
3533 */
3534 int ocfs2_refcount_cow(struct inode *inode,
3535 struct file *file,
3536 struct buffer_head *di_bh,
3537 u32 cpos, u32 write_len, u32 max_cpos)
3538 {
3539 int ret = 0;
3540 u32 p_cluster, num_clusters;
3541 unsigned int ext_flags;
3542
3543 while (write_len) {
3544 ret = ocfs2_get_clusters(inode, cpos, &p_cluster,
3545 &num_clusters, &ext_flags);
3546 if (ret) {
3547 mlog_errno(ret);
3548 break;
3549 }
3550
3551 if (write_len < num_clusters)
3552 num_clusters = write_len;
3553
3554 if (ext_flags & OCFS2_EXT_REFCOUNTED) {
3555 ret = ocfs2_refcount_cow_hunk(inode, file, di_bh, cpos,
3556 num_clusters, max_cpos);
3557 if (ret) {
3558 mlog_errno(ret);
3559 break;
3560 }
3561 }
3562
3563 write_len -= num_clusters;
3564 cpos += num_clusters;
3565 }
3566
3567 return ret;
3568 }
3569
3570 static int ocfs2_xattr_value_get_clusters(struct ocfs2_cow_context *context,
3571 u32 v_cluster, u32 *p_cluster,
3572 u32 *num_clusters,
3573 unsigned int *extent_flags)
3574 {
3575 struct inode *inode = context->inode;
3576 struct ocfs2_xattr_value_root *xv = context->cow_object;
3577
3578 return ocfs2_xattr_get_clusters(inode, v_cluster, p_cluster,
3579 num_clusters, &xv->xr_list,
3580 extent_flags);
3581 }
3582
3583 /*
3584 * Given a xattr value root, calculate the most meta/credits we need for
3585 * refcount tree change if we truncate it to 0.
3586 */
3587 int ocfs2_refcounted_xattr_delete_need(struct inode *inode,
3588 struct ocfs2_caching_info *ref_ci,
3589 struct buffer_head *ref_root_bh,
3590 struct ocfs2_xattr_value_root *xv,
3591 int *meta_add, int *credits)
3592 {
3593 int ret = 0, index, ref_blocks = 0;
3594 u32 p_cluster, num_clusters;
3595 u32 cpos = 0, clusters = le32_to_cpu(xv->xr_clusters);
3596 struct ocfs2_refcount_block *rb;
3597 struct ocfs2_refcount_rec rec;
3598 struct buffer_head *ref_leaf_bh = NULL;
3599
3600 while (cpos < clusters) {
3601 ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster,
3602 &num_clusters, &xv->xr_list,
3603 NULL);
3604 if (ret) {
3605 mlog_errno(ret);
3606 goto out;
3607 }
3608
3609 cpos += num_clusters;
3610
3611 while (num_clusters) {
3612 ret = ocfs2_get_refcount_rec(ref_ci, ref_root_bh,
3613 p_cluster, num_clusters,
3614 &rec, &index,
3615 &ref_leaf_bh);
3616 if (ret) {
3617 mlog_errno(ret);
3618 goto out;
3619 }
3620
3621 BUG_ON(!rec.r_refcount);
3622
3623 rb = (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
3624
3625 /*
3626 * We really don't know whether the other clusters is in
3627 * this refcount block or not, so just take the worst
3628 * case that all the clusters are in this block and each
3629 * one will split a refcount rec, so totally we need
3630 * clusters * 2 new refcount rec.
3631 */
3632 if (le16_to_cpu(rb->rf_records.rl_used) + clusters * 2 >
3633 le16_to_cpu(rb->rf_records.rl_count))
3634 ref_blocks++;
3635
3636 *credits += 1;
3637 brelse(ref_leaf_bh);
3638 ref_leaf_bh = NULL;
3639
3640 if (num_clusters <= le32_to_cpu(rec.r_clusters))
3641 break;
3642 else
3643 num_clusters -= le32_to_cpu(rec.r_clusters);
3644 p_cluster += num_clusters;
3645 }
3646 }
3647
3648 *meta_add += ref_blocks;
3649 if (!ref_blocks)
3650 goto out;
3651
3652 rb = (struct ocfs2_refcount_block *)ref_root_bh->b_data;
3653 if (le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL)
3654 *credits += OCFS2_EXPAND_REFCOUNT_TREE_CREDITS;
3655 else {
3656 struct ocfs2_extent_tree et;
3657
3658 ocfs2_init_refcount_extent_tree(&et, ref_ci, ref_root_bh);
3659 *credits += ocfs2_calc_extend_credits(inode->i_sb,
3660 et.et_root_el,
3661 ref_blocks);
3662 }
3663
3664 out:
3665 brelse(ref_leaf_bh);
3666 return ret;
3667 }
3668
3669 /*
3670 * Do CoW for xattr.
3671 */
3672 int ocfs2_refcount_cow_xattr(struct inode *inode,
3673 struct ocfs2_dinode *di,
3674 struct ocfs2_xattr_value_buf *vb,
3675 struct ocfs2_refcount_tree *ref_tree,
3676 struct buffer_head *ref_root_bh,
3677 u32 cpos, u32 write_len,
3678 struct ocfs2_post_refcount *post)
3679 {
3680 int ret;
3681 struct ocfs2_xattr_value_root *xv = vb->vb_xv;
3682 struct ocfs2_inode_info *oi = OCFS2_I(inode);
3683 struct ocfs2_cow_context *context = NULL;
3684 u32 cow_start, cow_len;
3685
3686 BUG_ON(!(oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL));
3687
3688 ret = ocfs2_refcount_cal_cow_clusters(inode, &xv->xr_list,
3689 cpos, write_len, UINT_MAX,
3690 &cow_start, &cow_len);
3691 if (ret) {
3692 mlog_errno(ret);
3693 goto out;
3694 }
3695
3696 BUG_ON(cow_len == 0);
3697
3698 context = kzalloc(sizeof(struct ocfs2_cow_context), GFP_NOFS);
3699 if (!context) {
3700 ret = -ENOMEM;
3701 mlog_errno(ret);
3702 goto out;
3703 }
3704
3705 context->inode = inode;
3706 context->cow_start = cow_start;
3707 context->cow_len = cow_len;
3708 context->ref_tree = ref_tree;
3709 context->ref_root_bh = ref_root_bh;
3710 context->cow_object = xv;
3711
3712 context->cow_duplicate_clusters = ocfs2_duplicate_clusters_by_jbd;
3713 /* We need the extra credits for duplicate_clusters by jbd. */
3714 context->extra_credits =
3715 ocfs2_clusters_to_blocks(inode->i_sb, 1) * cow_len;
3716 context->get_clusters = ocfs2_xattr_value_get_clusters;
3717 context->post_refcount = post;
3718
3719 ocfs2_init_xattr_value_extent_tree(&context->data_et,
3720 INODE_CACHE(inode), vb);
3721
3722 ret = ocfs2_replace_cow(context);
3723 if (ret)
3724 mlog_errno(ret);
3725
3726 out:
3727 kfree(context);
3728 return ret;
3729 }
3730
3731 /*
3732 * Insert a new extent into refcount tree and mark a extent rec
3733 * as refcounted in the dinode tree.
3734 */
3735 int ocfs2_add_refcount_flag(struct inode *inode,
3736 struct ocfs2_extent_tree *data_et,
3737 struct ocfs2_caching_info *ref_ci,
3738 struct buffer_head *ref_root_bh,
3739 u32 cpos, u32 p_cluster, u32 num_clusters,
3740 struct ocfs2_cached_dealloc_ctxt *dealloc,
3741 struct ocfs2_post_refcount *post)
3742 {
3743 int ret;
3744 handle_t *handle;
3745 int credits = 1, ref_blocks = 0;
3746 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3747 struct ocfs2_alloc_context *meta_ac = NULL;
3748
3749 ret = ocfs2_calc_refcount_meta_credits(inode->i_sb,
3750 ref_ci, ref_root_bh,
3751 p_cluster, num_clusters,
3752 &ref_blocks, &credits);
3753 if (ret) {
3754 mlog_errno(ret);
3755 goto out;
3756 }
3757
3758 trace_ocfs2_add_refcount_flag(ref_blocks, credits);
3759
3760 if (ref_blocks) {
3761 ret = ocfs2_reserve_new_metadata_blocks(OCFS2_SB(inode->i_sb),
3762 ref_blocks, &meta_ac);
3763 if (ret) {
3764 mlog_errno(ret);
3765 goto out;
3766 }
3767 }
3768
3769 if (post)
3770 credits += post->credits;
3771
3772 handle = ocfs2_start_trans(osb, credits);
3773 if (IS_ERR(handle)) {
3774 ret = PTR_ERR(handle);
3775 mlog_errno(ret);
3776 goto out;
3777 }
3778
3779 ret = ocfs2_mark_extent_refcounted(inode, data_et, handle,
3780 cpos, num_clusters, p_cluster,
3781 meta_ac, dealloc);
3782 if (ret) {
3783 mlog_errno(ret);
3784 goto out_commit;
3785 }
3786
3787 ret = __ocfs2_increase_refcount(handle, ref_ci, ref_root_bh,
3788 p_cluster, num_clusters, 0,
3789 meta_ac, dealloc);
3790 if (ret) {
3791 mlog_errno(ret);
3792 goto out_commit;
3793 }
3794
3795 if (post && post->func) {
3796 ret = post->func(inode, handle, post->para);
3797 if (ret)
3798 mlog_errno(ret);
3799 }
3800
3801 out_commit:
3802 ocfs2_commit_trans(osb, handle);
3803 out:
3804 if (meta_ac)
3805 ocfs2_free_alloc_context(meta_ac);
3806 return ret;
3807 }
3808
3809 static int ocfs2_change_ctime(struct inode *inode,
3810 struct buffer_head *di_bh)
3811 {
3812 int ret;
3813 handle_t *handle;
3814 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
3815
3816 handle = ocfs2_start_trans(OCFS2_SB(inode->i_sb),
3817 OCFS2_INODE_UPDATE_CREDITS);
3818 if (IS_ERR(handle)) {
3819 ret = PTR_ERR(handle);
3820 mlog_errno(ret);
3821 goto out;
3822 }
3823
3824 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
3825 OCFS2_JOURNAL_ACCESS_WRITE);
3826 if (ret) {
3827 mlog_errno(ret);
3828 goto out_commit;
3829 }
3830
3831 inode->i_ctime = CURRENT_TIME;
3832 di->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
3833 di->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
3834
3835 ocfs2_journal_dirty(handle, di_bh);
3836
3837 out_commit:
3838 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
3839 out:
3840 return ret;
3841 }
3842
3843 static int ocfs2_attach_refcount_tree(struct inode *inode,
3844 struct buffer_head *di_bh)
3845 {
3846 int ret, data_changed = 0;
3847 struct buffer_head *ref_root_bh = NULL;
3848 struct ocfs2_inode_info *oi = OCFS2_I(inode);
3849 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
3850 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3851 struct ocfs2_refcount_tree *ref_tree;
3852 unsigned int ext_flags;
3853 loff_t size;
3854 u32 cpos, num_clusters, clusters, p_cluster;
3855 struct ocfs2_cached_dealloc_ctxt dealloc;
3856 struct ocfs2_extent_tree di_et;
3857
3858 ocfs2_init_dealloc_ctxt(&dealloc);
3859
3860 if (!(oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL)) {
3861 ret = ocfs2_create_refcount_tree(inode, di_bh);
3862 if (ret) {
3863 mlog_errno(ret);
3864 goto out;
3865 }
3866 }
3867
3868 BUG_ON(!di->i_refcount_loc);
3869 ret = ocfs2_lock_refcount_tree(osb,
3870 le64_to_cpu(di->i_refcount_loc), 1,
3871 &ref_tree, &ref_root_bh);
3872 if (ret) {
3873 mlog_errno(ret);
3874 goto out;
3875 }
3876
3877 if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL)
3878 goto attach_xattr;
3879
3880 ocfs2_init_dinode_extent_tree(&di_et, INODE_CACHE(inode), di_bh);
3881
3882 size = i_size_read(inode);
3883 clusters = ocfs2_clusters_for_bytes(inode->i_sb, size);
3884
3885 cpos = 0;
3886 while (cpos < clusters) {
3887 ret = ocfs2_get_clusters(inode, cpos, &p_cluster,
3888 &num_clusters, &ext_flags);
3889
3890 if (p_cluster && !(ext_flags & OCFS2_EXT_REFCOUNTED)) {
3891 ret = ocfs2_add_refcount_flag(inode, &di_et,
3892 &ref_tree->rf_ci,
3893 ref_root_bh, cpos,
3894 p_cluster, num_clusters,
3895 &dealloc, NULL);
3896 if (ret) {
3897 mlog_errno(ret);
3898 goto unlock;
3899 }
3900
3901 data_changed = 1;
3902 }
3903 cpos += num_clusters;
3904 }
3905
3906 attach_xattr:
3907 if (oi->ip_dyn_features & OCFS2_HAS_XATTR_FL) {
3908 ret = ocfs2_xattr_attach_refcount_tree(inode, di_bh,
3909 &ref_tree->rf_ci,
3910 ref_root_bh,
3911 &dealloc);
3912 if (ret) {
3913 mlog_errno(ret);
3914 goto unlock;
3915 }
3916 }
3917
3918 if (data_changed) {
3919 ret = ocfs2_change_ctime(inode, di_bh);
3920 if (ret)
3921 mlog_errno(ret);
3922 }
3923
3924 unlock:
3925 ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
3926 brelse(ref_root_bh);
3927
3928 if (!ret && ocfs2_dealloc_has_cluster(&dealloc)) {
3929 ocfs2_schedule_truncate_log_flush(osb, 1);
3930 ocfs2_run_deallocs(osb, &dealloc);
3931 }
3932 out:
3933 /*
3934 * Empty the extent map so that we may get the right extent
3935 * record from the disk.
3936 */
3937 ocfs2_extent_map_trunc(inode, 0);
3938
3939 return ret;
3940 }
3941
3942 static int ocfs2_add_refcounted_extent(struct inode *inode,
3943 struct ocfs2_extent_tree *et,
3944 struct ocfs2_caching_info *ref_ci,
3945 struct buffer_head *ref_root_bh,
3946 u32 cpos, u32 p_cluster, u32 num_clusters,
3947 unsigned int ext_flags,
3948 struct ocfs2_cached_dealloc_ctxt *dealloc)
3949 {
3950 int ret;
3951 handle_t *handle;
3952 int credits = 0;
3953 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3954 struct ocfs2_alloc_context *meta_ac = NULL;
3955
3956 ret = ocfs2_lock_refcount_allocators(inode->i_sb,
3957 p_cluster, num_clusters,
3958 et, ref_ci,
3959 ref_root_bh, &meta_ac,
3960 NULL, &credits);
3961 if (ret) {
3962 mlog_errno(ret);
3963 goto out;
3964 }
3965
3966 handle = ocfs2_start_trans(osb, credits);
3967 if (IS_ERR(handle)) {
3968 ret = PTR_ERR(handle);
3969 mlog_errno(ret);
3970 goto out;
3971 }
3972
3973 ret = ocfs2_insert_extent(handle, et, cpos,
3974 ocfs2_clusters_to_blocks(inode->i_sb, p_cluster),
3975 num_clusters, ext_flags, meta_ac);
3976 if (ret) {
3977 mlog_errno(ret);
3978 goto out_commit;
3979 }
3980
3981 ret = ocfs2_increase_refcount(handle, ref_ci, ref_root_bh,
3982 p_cluster, num_clusters,
3983 meta_ac, dealloc);
3984 if (ret)
3985 mlog_errno(ret);
3986
3987 out_commit:
3988 ocfs2_commit_trans(osb, handle);
3989 out:
3990 if (meta_ac)
3991 ocfs2_free_alloc_context(meta_ac);
3992 return ret;
3993 }
3994
3995 static int ocfs2_duplicate_inline_data(struct inode *s_inode,
3996 struct buffer_head *s_bh,
3997 struct inode *t_inode,
3998 struct buffer_head *t_bh)
3999 {
4000 int ret;
4001 handle_t *handle;
4002 struct ocfs2_super *osb = OCFS2_SB(s_inode->i_sb);
4003 struct ocfs2_dinode *s_di = (struct ocfs2_dinode *)s_bh->b_data;
4004 struct ocfs2_dinode *t_di = (struct ocfs2_dinode *)t_bh->b_data;
4005
4006 BUG_ON(!(OCFS2_I(s_inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL));
4007
4008 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
4009 if (IS_ERR(handle)) {
4010 ret = PTR_ERR(handle);
4011 mlog_errno(ret);
4012 goto out;
4013 }
4014
4015 ret = ocfs2_journal_access_di(handle, INODE_CACHE(t_inode), t_bh,
4016 OCFS2_JOURNAL_ACCESS_WRITE);
4017 if (ret) {
4018 mlog_errno(ret);
4019 goto out_commit;
4020 }
4021
4022 t_di->id2.i_data.id_count = s_di->id2.i_data.id_count;
4023 memcpy(t_di->id2.i_data.id_data, s_di->id2.i_data.id_data,
4024 le16_to_cpu(s_di->id2.i_data.id_count));
4025 spin_lock(&OCFS2_I(t_inode)->ip_lock);
4026 OCFS2_I(t_inode)->ip_dyn_features |= OCFS2_INLINE_DATA_FL;
4027 t_di->i_dyn_features = cpu_to_le16(OCFS2_I(t_inode)->ip_dyn_features);
4028 spin_unlock(&OCFS2_I(t_inode)->ip_lock);
4029
4030 ocfs2_journal_dirty(handle, t_bh);
4031
4032 out_commit:
4033 ocfs2_commit_trans(osb, handle);
4034 out:
4035 return ret;
4036 }
4037
4038 static int ocfs2_duplicate_extent_list(struct inode *s_inode,
4039 struct inode *t_inode,
4040 struct buffer_head *t_bh,
4041 struct ocfs2_caching_info *ref_ci,
4042 struct buffer_head *ref_root_bh,
4043 struct ocfs2_cached_dealloc_ctxt *dealloc)
4044 {
4045 int ret = 0;
4046 u32 p_cluster, num_clusters, clusters, cpos;
4047 loff_t size;
4048 unsigned int ext_flags;
4049 struct ocfs2_extent_tree et;
4050
4051 ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(t_inode), t_bh);
4052
4053 size = i_size_read(s_inode);
4054 clusters = ocfs2_clusters_for_bytes(s_inode->i_sb, size);
4055
4056 cpos = 0;
4057 while (cpos < clusters) {
4058 ret = ocfs2_get_clusters(s_inode, cpos, &p_cluster,
4059 &num_clusters, &ext_flags);
4060
4061 if (p_cluster) {
4062 ret = ocfs2_add_refcounted_extent(t_inode, &et,
4063 ref_ci, ref_root_bh,
4064 cpos, p_cluster,
4065 num_clusters,
4066 ext_flags,
4067 dealloc);
4068 if (ret) {
4069 mlog_errno(ret);
4070 goto out;
4071 }
4072 }
4073
4074 cpos += num_clusters;
4075 }
4076
4077 out:
4078 return ret;
4079 }
4080
4081 /*
4082 * change the new file's attributes to the src.
4083 *
4084 * reflink creates a snapshot of a file, that means the attributes
4085 * must be identical except for three exceptions - nlink, ino, and ctime.
4086 */
4087 static int ocfs2_complete_reflink(struct inode *s_inode,
4088 struct buffer_head *s_bh,
4089 struct inode *t_inode,
4090 struct buffer_head *t_bh,
4091 bool preserve)
4092 {
4093 int ret;
4094 handle_t *handle;
4095 struct ocfs2_dinode *s_di = (struct ocfs2_dinode *)s_bh->b_data;
4096 struct ocfs2_dinode *di = (struct ocfs2_dinode *)t_bh->b_data;
4097 loff_t size = i_size_read(s_inode);
4098
4099 handle = ocfs2_start_trans(OCFS2_SB(t_inode->i_sb),
4100 OCFS2_INODE_UPDATE_CREDITS);
4101 if (IS_ERR(handle)) {
4102 ret = PTR_ERR(handle);
4103 mlog_errno(ret);
4104 return ret;
4105 }
4106
4107 ret = ocfs2_journal_access_di(handle, INODE_CACHE(t_inode), t_bh,
4108 OCFS2_JOURNAL_ACCESS_WRITE);
4109 if (ret) {
4110 mlog_errno(ret);
4111 goto out_commit;
4112 }
4113
4114 spin_lock(&OCFS2_I(t_inode)->ip_lock);
4115 OCFS2_I(t_inode)->ip_clusters = OCFS2_I(s_inode)->ip_clusters;
4116 OCFS2_I(t_inode)->ip_attr = OCFS2_I(s_inode)->ip_attr;
4117 OCFS2_I(t_inode)->ip_dyn_features = OCFS2_I(s_inode)->ip_dyn_features;
4118 spin_unlock(&OCFS2_I(t_inode)->ip_lock);
4119 i_size_write(t_inode, size);
4120 t_inode->i_blocks = s_inode->i_blocks;
4121
4122 di->i_xattr_inline_size = s_di->i_xattr_inline_size;
4123 di->i_clusters = s_di->i_clusters;
4124 di->i_size = s_di->i_size;
4125 di->i_dyn_features = s_di->i_dyn_features;
4126 di->i_attr = s_di->i_attr;
4127
4128 if (preserve) {
4129 t_inode->i_uid = s_inode->i_uid;
4130 t_inode->i_gid = s_inode->i_gid;
4131 t_inode->i_mode = s_inode->i_mode;
4132 di->i_uid = s_di->i_uid;
4133 di->i_gid = s_di->i_gid;
4134 di->i_mode = s_di->i_mode;
4135
4136 /*
4137 * update time.
4138 * we want mtime to appear identical to the source and
4139 * update ctime.
4140 */
4141 t_inode->i_ctime = CURRENT_TIME;
4142
4143 di->i_ctime = cpu_to_le64(t_inode->i_ctime.tv_sec);
4144 di->i_ctime_nsec = cpu_to_le32(t_inode->i_ctime.tv_nsec);
4145
4146 t_inode->i_mtime = s_inode->i_mtime;
4147 di->i_mtime = s_di->i_mtime;
4148 di->i_mtime_nsec = s_di->i_mtime_nsec;
4149 }
4150
4151 ocfs2_journal_dirty(handle, t_bh);
4152
4153 out_commit:
4154 ocfs2_commit_trans(OCFS2_SB(t_inode->i_sb), handle);
4155 return ret;
4156 }
4157
4158 static int ocfs2_create_reflink_node(struct inode *s_inode,
4159 struct buffer_head *s_bh,
4160 struct inode *t_inode,
4161 struct buffer_head *t_bh,
4162 bool preserve)
4163 {
4164 int ret;
4165 struct buffer_head *ref_root_bh = NULL;
4166 struct ocfs2_cached_dealloc_ctxt dealloc;
4167 struct ocfs2_super *osb = OCFS2_SB(s_inode->i_sb);
4168 struct ocfs2_refcount_block *rb;
4169 struct ocfs2_dinode *di = (struct ocfs2_dinode *)s_bh->b_data;
4170 struct ocfs2_refcount_tree *ref_tree;
4171
4172 ocfs2_init_dealloc_ctxt(&dealloc);
4173
4174 ret = ocfs2_set_refcount_tree(t_inode, t_bh,
4175 le64_to_cpu(di->i_refcount_loc));
4176 if (ret) {
4177 mlog_errno(ret);
4178 goto out;
4179 }
4180
4181 if (OCFS2_I(s_inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
4182 ret = ocfs2_duplicate_inline_data(s_inode, s_bh,
4183 t_inode, t_bh);
4184 if (ret)
4185 mlog_errno(ret);
4186 goto out;
4187 }
4188
4189 ret = ocfs2_lock_refcount_tree(osb, le64_to_cpu(di->i_refcount_loc),
4190 1, &ref_tree, &ref_root_bh);
4191 if (ret) {
4192 mlog_errno(ret);
4193 goto out;
4194 }
4195 rb = (struct ocfs2_refcount_block *)ref_root_bh->b_data;
4196
4197 ret = ocfs2_duplicate_extent_list(s_inode, t_inode, t_bh,
4198 &ref_tree->rf_ci, ref_root_bh,
4199 &dealloc);
4200 if (ret) {
4201 mlog_errno(ret);
4202 goto out_unlock_refcount;
4203 }
4204
4205 out_unlock_refcount:
4206 ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
4207 brelse(ref_root_bh);
4208 out:
4209 if (ocfs2_dealloc_has_cluster(&dealloc)) {
4210 ocfs2_schedule_truncate_log_flush(osb, 1);
4211 ocfs2_run_deallocs(osb, &dealloc);
4212 }
4213
4214 return ret;
4215 }
4216
4217 static int __ocfs2_reflink(struct dentry *old_dentry,
4218 struct buffer_head *old_bh,
4219 struct inode *new_inode,
4220 bool preserve)
4221 {
4222 int ret;
4223 struct inode *inode = old_dentry->d_inode;
4224 struct buffer_head *new_bh = NULL;
4225
4226 if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_SYSTEM_FILE) {
4227 ret = -EINVAL;
4228 mlog_errno(ret);
4229 goto out;
4230 }
4231
4232 ret = filemap_fdatawrite(inode->i_mapping);
4233 if (ret) {
4234 mlog_errno(ret);
4235 goto out;
4236 }
4237
4238 ret = ocfs2_attach_refcount_tree(inode, old_bh);
4239 if (ret) {
4240 mlog_errno(ret);
4241 goto out;
4242 }
4243
4244 mutex_lock_nested(&new_inode->i_mutex, I_MUTEX_CHILD);
4245 ret = ocfs2_inode_lock_nested(new_inode, &new_bh, 1,
4246 OI_LS_REFLINK_TARGET);
4247 if (ret) {
4248 mlog_errno(ret);
4249 goto out_unlock;
4250 }
4251
4252 ret = ocfs2_create_reflink_node(inode, old_bh,
4253 new_inode, new_bh, preserve);
4254 if (ret) {
4255 mlog_errno(ret);
4256 goto inode_unlock;
4257 }
4258
4259 if (OCFS2_I(inode)->ip_dyn_features & OCFS2_HAS_XATTR_FL) {
4260 ret = ocfs2_reflink_xattrs(inode, old_bh,
4261 new_inode, new_bh,
4262 preserve);
4263 if (ret) {
4264 mlog_errno(ret);
4265 goto inode_unlock;
4266 }
4267 }
4268
4269 ret = ocfs2_complete_reflink(inode, old_bh,
4270 new_inode, new_bh, preserve);
4271 if (ret)
4272 mlog_errno(ret);
4273
4274 inode_unlock:
4275 ocfs2_inode_unlock(new_inode, 1);
4276 brelse(new_bh);
4277 out_unlock:
4278 mutex_unlock(&new_inode->i_mutex);
4279 out:
4280 if (!ret) {
4281 ret = filemap_fdatawait(inode->i_mapping);
4282 if (ret)
4283 mlog_errno(ret);
4284 }
4285 return ret;
4286 }
4287
4288 static int ocfs2_reflink(struct dentry *old_dentry, struct inode *dir,
4289 struct dentry *new_dentry, bool preserve)
4290 {
4291 int error;
4292 struct inode *inode = old_dentry->d_inode;
4293 struct buffer_head *old_bh = NULL;
4294 struct inode *new_orphan_inode = NULL;
4295
4296 if (!ocfs2_refcount_tree(OCFS2_SB(inode->i_sb)))
4297 return -EOPNOTSUPP;
4298
4299 error = ocfs2_create_inode_in_orphan(dir, inode->i_mode,
4300 &new_orphan_inode);
4301 if (error) {
4302 mlog_errno(error);
4303 goto out;
4304 }
4305
4306 error = ocfs2_inode_lock(inode, &old_bh, 1);
4307 if (error) {
4308 mlog_errno(error);
4309 goto out;
4310 }
4311
4312 down_write(&OCFS2_I(inode)->ip_xattr_sem);
4313 down_write(&OCFS2_I(inode)->ip_alloc_sem);
4314 error = __ocfs2_reflink(old_dentry, old_bh,
4315 new_orphan_inode, preserve);
4316 up_write(&OCFS2_I(inode)->ip_alloc_sem);
4317 up_write(&OCFS2_I(inode)->ip_xattr_sem);
4318
4319 ocfs2_inode_unlock(inode, 1);
4320 brelse(old_bh);
4321
4322 if (error) {
4323 mlog_errno(error);
4324 goto out;
4325 }
4326
4327 /* If the security isn't preserved, we need to re-initialize them. */
4328 if (!preserve) {
4329 error = ocfs2_init_security_and_acl(dir, new_orphan_inode,
4330 &new_dentry->d_name);
4331 if (error)
4332 mlog_errno(error);
4333 }
4334 out:
4335 if (!error) {
4336 error = ocfs2_mv_orphaned_inode_to_new(dir, new_orphan_inode,
4337 new_dentry);
4338 if (error)
4339 mlog_errno(error);
4340 }
4341
4342 if (new_orphan_inode) {
4343 /*
4344 * We need to open_unlock the inode no matter whether we
4345 * succeed or not, so that other nodes can delete it later.
4346 */
4347 ocfs2_open_unlock(new_orphan_inode);
4348 if (error)
4349 iput(new_orphan_inode);
4350 }
4351
4352 return error;
4353 }
4354
4355 /*
4356 * Below here are the bits used by OCFS2_IOC_REFLINK() to fake
4357 * sys_reflink(). This will go away when vfs_reflink() exists in
4358 * fs/namei.c.
4359 */
4360
4361 /* copied from may_create in VFS. */
4362 static inline int ocfs2_may_create(struct inode *dir, struct dentry *child)
4363 {
4364 if (child->d_inode)
4365 return -EEXIST;
4366 if (IS_DEADDIR(dir))
4367 return -ENOENT;
4368 return inode_permission(dir, MAY_WRITE | MAY_EXEC);
4369 }
4370
4371 /**
4372 * ocfs2_vfs_reflink - Create a reference-counted link
4373 *
4374 * @old_dentry: source dentry + inode
4375 * @dir: directory to create the target
4376 * @new_dentry: target dentry
4377 * @preserve: if true, preserve all file attributes
4378 */
4379 static int ocfs2_vfs_reflink(struct dentry *old_dentry, struct inode *dir,
4380 struct dentry *new_dentry, bool preserve)
4381 {
4382 struct inode *inode = old_dentry->d_inode;
4383 int error;
4384
4385 if (!inode)
4386 return -ENOENT;
4387
4388 error = ocfs2_may_create(dir, new_dentry);
4389 if (error)
4390 return error;
4391
4392 if (dir->i_sb != inode->i_sb)
4393 return -EXDEV;
4394
4395 /*
4396 * A reflink to an append-only or immutable file cannot be created.
4397 */
4398 if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
4399 return -EPERM;
4400
4401 /* Only regular files can be reflinked. */
4402 if (!S_ISREG(inode->i_mode))
4403 return -EPERM;
4404
4405 /*
4406 * If the caller wants to preserve ownership, they require the
4407 * rights to do so.
4408 */
4409 if (preserve) {
4410 if ((current_fsuid() != inode->i_uid) && !capable(CAP_CHOWN))
4411 return -EPERM;
4412 if (!in_group_p(inode->i_gid) && !capable(CAP_CHOWN))
4413 return -EPERM;
4414 }
4415
4416 /*
4417 * If the caller is modifying any aspect of the attributes, they
4418 * are not creating a snapshot. They need read permission on the
4419 * file.
4420 */
4421 if (!preserve) {
4422 error = inode_permission(inode, MAY_READ);
4423 if (error)
4424 return error;
4425 }
4426
4427 mutex_lock(&inode->i_mutex);
4428 dquot_initialize(dir);
4429 error = ocfs2_reflink(old_dentry, dir, new_dentry, preserve);
4430 mutex_unlock(&inode->i_mutex);
4431 if (!error)
4432 fsnotify_create(dir, new_dentry);
4433 return error;
4434 }
4435 /*
4436 * Most codes are copied from sys_linkat.
4437 */
4438 int ocfs2_reflink_ioctl(struct inode *inode,
4439 const char __user *oldname,
4440 const char __user *newname,
4441 bool preserve)
4442 {
4443 struct dentry *new_dentry;
4444 struct path old_path, new_path;
4445 int error;
4446
4447 if (!ocfs2_refcount_tree(OCFS2_SB(inode->i_sb)))
4448 return -EOPNOTSUPP;
4449
4450 error = user_path_at(AT_FDCWD, oldname, 0, &old_path);
4451 if (error) {
4452 mlog_errno(error);
4453 return error;
4454 }
4455
4456 new_dentry = user_path_create(AT_FDCWD, newname, &new_path, 0);
4457 error = PTR_ERR(new_dentry);
4458 if (IS_ERR(new_dentry)) {
4459 mlog_errno(error);
4460 goto out;
4461 }
4462
4463 error = -EXDEV;
4464 if (old_path.mnt != new_path.mnt) {
4465 mlog_errno(error);
4466 goto out_dput;
4467 }
4468
4469 error = mnt_want_write(new_path.mnt);
4470 if (error) {
4471 mlog_errno(error);
4472 goto out_dput;
4473 }
4474
4475 error = ocfs2_vfs_reflink(old_path.dentry,
4476 new_path.dentry->d_inode,
4477 new_dentry, preserve);
4478 mnt_drop_write(new_path.mnt);
4479 out_dput:
4480 dput(new_dentry);
4481 mutex_unlock(&new_path.dentry->d_inode->i_mutex);
4482 path_put(&new_path);
4483 out:
4484 path_put(&old_path);
4485
4486 return error;
4487 }