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18#include <linux/sort.h>
19#define MLOG_MASK_PREFIX ML_REFCOUNT
20#include <cluster/masklog.h>
21#include "ocfs2.h"
22#include "inode.h"
23#include "alloc.h"
24#include "suballoc.h"
25#include "journal.h"
26#include "uptodate.h"
27#include "super.h"
28#include "buffer_head_io.h"
29#include "blockcheck.h"
30#include "refcounttree.h"
31#include "sysfile.h"
32#include "dlmglue.h"
33#include "extent_map.h"
34#include "aops.h"
35#include "xattr.h"
36#include "namei.h"
37
38#include <linux/bio.h>
39#include <linux/blkdev.h>
40#include <linux/gfp.h>
41#include <linux/slab.h>
42#include <linux/writeback.h>
43#include <linux/pagevec.h>
44#include <linux/swap.h>
45#include <linux/security.h>
46#include <linux/fsnotify.h>
47#include <linux/quotaops.h>
48#include <linux/namei.h>
49#include <linux/mount.h>
50
51struct ocfs2_cow_context {
52 struct inode *inode;
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 ocfs2_cow_context *context,
70 u32 cpos, u32 old_cluster,
71 u32 new_cluster, u32 new_len);
72};
73
74static inline struct ocfs2_refcount_tree *
75cache_info_to_refcount(struct ocfs2_caching_info *ci)
76{
77 return container_of(ci, struct ocfs2_refcount_tree, rf_ci);
78}
79
80static int ocfs2_validate_refcount_block(struct super_block *sb,
81 struct buffer_head *bh)
82{
83 int rc;
84 struct ocfs2_refcount_block *rb =
85 (struct ocfs2_refcount_block *)bh->b_data;
86
87 mlog(0, "Validating refcount block %llu\n",
88 (unsigned long long)bh->b_blocknr);
89
90 BUG_ON(!buffer_uptodate(bh));
91
92
93
94
95
96
97 rc = ocfs2_validate_meta_ecc(sb, bh->b_data, &rb->rf_check);
98 if (rc) {
99 mlog(ML_ERROR, "Checksum failed for refcount block %llu\n",
100 (unsigned long long)bh->b_blocknr);
101 return rc;
102 }
103
104
105 if (!OCFS2_IS_VALID_REFCOUNT_BLOCK(rb)) {
106 ocfs2_error(sb,
107 "Refcount block #%llu has bad signature %.*s",
108 (unsigned long long)bh->b_blocknr, 7,
109 rb->rf_signature);
110 return -EINVAL;
111 }
112
113 if (le64_to_cpu(rb->rf_blkno) != bh->b_blocknr) {
114 ocfs2_error(sb,
115 "Refcount block #%llu has an invalid rf_blkno "
116 "of %llu",
117 (unsigned long long)bh->b_blocknr,
118 (unsigned long long)le64_to_cpu(rb->rf_blkno));
119 return -EINVAL;
120 }
121
122 if (le32_to_cpu(rb->rf_fs_generation) != OCFS2_SB(sb)->fs_generation) {
123 ocfs2_error(sb,
124 "Refcount block #%llu has an invalid "
125 "rf_fs_generation of #%u",
126 (unsigned long long)bh->b_blocknr,
127 le32_to_cpu(rb->rf_fs_generation));
128 return -EINVAL;
129 }
130
131 return 0;
132}
133
134static int ocfs2_read_refcount_block(struct ocfs2_caching_info *ci,
135 u64 rb_blkno,
136 struct buffer_head **bh)
137{
138 int rc;
139 struct buffer_head *tmp = *bh;
140
141 rc = ocfs2_read_block(ci, rb_blkno, &tmp,
142 ocfs2_validate_refcount_block);
143
144
145 if (!rc && !*bh)
146 *bh = tmp;
147
148 return rc;
149}
150
151static u64 ocfs2_refcount_cache_owner(struct ocfs2_caching_info *ci)
152{
153 struct ocfs2_refcount_tree *rf = cache_info_to_refcount(ci);
154
155 return rf->rf_blkno;
156}
157
158static struct super_block *
159ocfs2_refcount_cache_get_super(struct ocfs2_caching_info *ci)
160{
161 struct ocfs2_refcount_tree *rf = cache_info_to_refcount(ci);
162
163 return rf->rf_sb;
164}
165
166static void ocfs2_refcount_cache_lock(struct ocfs2_caching_info *ci)
167{
168 struct ocfs2_refcount_tree *rf = cache_info_to_refcount(ci);
169
170 spin_lock(&rf->rf_lock);
171}
172
173static void ocfs2_refcount_cache_unlock(struct ocfs2_caching_info *ci)
174{
175 struct ocfs2_refcount_tree *rf = cache_info_to_refcount(ci);
176
177 spin_unlock(&rf->rf_lock);
178}
179
180static void ocfs2_refcount_cache_io_lock(struct ocfs2_caching_info *ci)
181{
182 struct ocfs2_refcount_tree *rf = cache_info_to_refcount(ci);
183
184 mutex_lock(&rf->rf_io_mutex);
185}
186
187static void ocfs2_refcount_cache_io_unlock(struct ocfs2_caching_info *ci)
188{
189 struct ocfs2_refcount_tree *rf = cache_info_to_refcount(ci);
190
191 mutex_unlock(&rf->rf_io_mutex);
192}
193
194static const struct ocfs2_caching_operations ocfs2_refcount_caching_ops = {
195 .co_owner = ocfs2_refcount_cache_owner,
196 .co_get_super = ocfs2_refcount_cache_get_super,
197 .co_cache_lock = ocfs2_refcount_cache_lock,
198 .co_cache_unlock = ocfs2_refcount_cache_unlock,
199 .co_io_lock = ocfs2_refcount_cache_io_lock,
200 .co_io_unlock = ocfs2_refcount_cache_io_unlock,
201};
202
203static struct ocfs2_refcount_tree *
204ocfs2_find_refcount_tree(struct ocfs2_super *osb, u64 blkno)
205{
206 struct rb_node *n = osb->osb_rf_lock_tree.rb_node;
207 struct ocfs2_refcount_tree *tree = NULL;
208
209 while (n) {
210 tree = rb_entry(n, struct ocfs2_refcount_tree, rf_node);
211
212 if (blkno < tree->rf_blkno)
213 n = n->rb_left;
214 else if (blkno > tree->rf_blkno)
215 n = n->rb_right;
216 else
217 return tree;
218 }
219
220 return NULL;
221}
222
223
224static void ocfs2_insert_refcount_tree(struct ocfs2_super *osb,
225 struct ocfs2_refcount_tree *new)
226{
227 u64 rf_blkno = new->rf_blkno;
228 struct rb_node *parent = NULL;
229 struct rb_node **p = &osb->osb_rf_lock_tree.rb_node;
230 struct ocfs2_refcount_tree *tmp;
231
232 while (*p) {
233 parent = *p;
234
235 tmp = rb_entry(parent, struct ocfs2_refcount_tree,
236 rf_node);
237
238 if (rf_blkno < tmp->rf_blkno)
239 p = &(*p)->rb_left;
240 else if (rf_blkno > tmp->rf_blkno)
241 p = &(*p)->rb_right;
242 else {
243
244 mlog(ML_ERROR, "Duplicate refcount block %llu found!\n",
245 (unsigned long long)rf_blkno);
246 BUG();
247 }
248 }
249
250 rb_link_node(&new->rf_node, parent, p);
251 rb_insert_color(&new->rf_node, &osb->osb_rf_lock_tree);
252}
253
254static void ocfs2_free_refcount_tree(struct ocfs2_refcount_tree *tree)
255{
256 ocfs2_metadata_cache_exit(&tree->rf_ci);
257 ocfs2_simple_drop_lockres(OCFS2_SB(tree->rf_sb), &tree->rf_lockres);
258 ocfs2_lock_res_free(&tree->rf_lockres);
259 kfree(tree);
260}
261
262static inline void
263ocfs2_erase_refcount_tree_from_list_no_lock(struct ocfs2_super *osb,
264 struct ocfs2_refcount_tree *tree)
265{
266 rb_erase(&tree->rf_node, &osb->osb_rf_lock_tree);
267 if (osb->osb_ref_tree_lru && osb->osb_ref_tree_lru == tree)
268 osb->osb_ref_tree_lru = NULL;
269}
270
271static void ocfs2_erase_refcount_tree_from_list(struct ocfs2_super *osb,
272 struct ocfs2_refcount_tree *tree)
273{
274 spin_lock(&osb->osb_lock);
275 ocfs2_erase_refcount_tree_from_list_no_lock(osb, tree);
276 spin_unlock(&osb->osb_lock);
277}
278
279void ocfs2_kref_remove_refcount_tree(struct kref *kref)
280{
281 struct ocfs2_refcount_tree *tree =
282 container_of(kref, struct ocfs2_refcount_tree, rf_getcnt);
283
284 ocfs2_free_refcount_tree(tree);
285}
286
287static inline void
288ocfs2_refcount_tree_get(struct ocfs2_refcount_tree *tree)
289{
290 kref_get(&tree->rf_getcnt);
291}
292
293static inline void
294ocfs2_refcount_tree_put(struct ocfs2_refcount_tree *tree)
295{
296 kref_put(&tree->rf_getcnt, ocfs2_kref_remove_refcount_tree);
297}
298
299static inline void ocfs2_init_refcount_tree_ci(struct ocfs2_refcount_tree *new,
300 struct super_block *sb)
301{
302 ocfs2_metadata_cache_init(&new->rf_ci, &ocfs2_refcount_caching_ops);
303 mutex_init(&new->rf_io_mutex);
304 new->rf_sb = sb;
305 spin_lock_init(&new->rf_lock);
306}
307
308static inline void ocfs2_init_refcount_tree_lock(struct ocfs2_super *osb,
309 struct ocfs2_refcount_tree *new,
310 u64 rf_blkno, u32 generation)
311{
312 init_rwsem(&new->rf_sem);
313 ocfs2_refcount_lock_res_init(&new->rf_lockres, osb,
314 rf_blkno, generation);
315}
316
317static struct ocfs2_refcount_tree*
318ocfs2_allocate_refcount_tree(struct ocfs2_super *osb, u64 rf_blkno)
319{
320 struct ocfs2_refcount_tree *new;
321
322 new = kzalloc(sizeof(struct ocfs2_refcount_tree), GFP_NOFS);
323 if (!new)
324 return NULL;
325
326 new->rf_blkno = rf_blkno;
327 kref_init(&new->rf_getcnt);
328 ocfs2_init_refcount_tree_ci(new, osb->sb);
329
330 return new;
331}
332
333static int ocfs2_get_refcount_tree(struct ocfs2_super *osb, u64 rf_blkno,
334 struct ocfs2_refcount_tree **ret_tree)
335{
336 int ret = 0;
337 struct ocfs2_refcount_tree *tree, *new = NULL;
338 struct buffer_head *ref_root_bh = NULL;
339 struct ocfs2_refcount_block *ref_rb;
340
341 spin_lock(&osb->osb_lock);
342 if (osb->osb_ref_tree_lru &&
343 osb->osb_ref_tree_lru->rf_blkno == rf_blkno)
344 tree = osb->osb_ref_tree_lru;
345 else
346 tree = ocfs2_find_refcount_tree(osb, rf_blkno);
347 if (tree)
348 goto out;
349
350 spin_unlock(&osb->osb_lock);
351
352 new = ocfs2_allocate_refcount_tree(osb, rf_blkno);
353 if (!new) {
354 ret = -ENOMEM;
355 mlog_errno(ret);
356 return ret;
357 }
358
359
360
361
362
363
364
365
366 ret = ocfs2_read_refcount_block(&new->rf_ci, rf_blkno, &ref_root_bh);
367 if (ret) {
368 mlog_errno(ret);
369 ocfs2_metadata_cache_exit(&new->rf_ci);
370 kfree(new);
371 return ret;
372 }
373
374 ref_rb = (struct ocfs2_refcount_block *)ref_root_bh->b_data;
375 new->rf_generation = le32_to_cpu(ref_rb->rf_generation);
376 ocfs2_init_refcount_tree_lock(osb, new, rf_blkno,
377 new->rf_generation);
378 ocfs2_metadata_cache_purge(&new->rf_ci);
379
380 spin_lock(&osb->osb_lock);
381 tree = ocfs2_find_refcount_tree(osb, rf_blkno);
382 if (tree)
383 goto out;
384
385 ocfs2_insert_refcount_tree(osb, new);
386
387 tree = new;
388 new = NULL;
389
390out:
391 *ret_tree = tree;
392
393 osb->osb_ref_tree_lru = tree;
394
395 spin_unlock(&osb->osb_lock);
396
397 if (new)
398 ocfs2_free_refcount_tree(new);
399
400 brelse(ref_root_bh);
401 return ret;
402}
403
404static int ocfs2_get_refcount_block(struct inode *inode, u64 *ref_blkno)
405{
406 int ret;
407 struct buffer_head *di_bh = NULL;
408 struct ocfs2_dinode *di;
409
410 ret = ocfs2_read_inode_block(inode, &di_bh);
411 if (ret) {
412 mlog_errno(ret);
413 goto out;
414 }
415
416 BUG_ON(!(OCFS2_I(inode)->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL));
417
418 di = (struct ocfs2_dinode *)di_bh->b_data;
419 *ref_blkno = le64_to_cpu(di->i_refcount_loc);
420 brelse(di_bh);
421out:
422 return ret;
423}
424
425static int __ocfs2_lock_refcount_tree(struct ocfs2_super *osb,
426 struct ocfs2_refcount_tree *tree, int rw)
427{
428 int ret;
429
430 ret = ocfs2_refcount_lock(tree, rw);
431 if (ret) {
432 mlog_errno(ret);
433 goto out;
434 }
435
436 if (rw)
437 down_write(&tree->rf_sem);
438 else
439 down_read(&tree->rf_sem);
440
441out:
442 return ret;
443}
444
445
446
447
448
449
450
451
452
453int ocfs2_lock_refcount_tree(struct ocfs2_super *osb,
454 u64 ref_blkno, int rw,
455 struct ocfs2_refcount_tree **ret_tree,
456 struct buffer_head **ref_bh)
457{
458 int ret, delete_tree = 0;
459 struct ocfs2_refcount_tree *tree = NULL;
460 struct buffer_head *ref_root_bh = NULL;
461 struct ocfs2_refcount_block *rb;
462
463again:
464 ret = ocfs2_get_refcount_tree(osb, ref_blkno, &tree);
465 if (ret) {
466 mlog_errno(ret);
467 return ret;
468 }
469
470 ocfs2_refcount_tree_get(tree);
471
472 ret = __ocfs2_lock_refcount_tree(osb, tree, rw);
473 if (ret) {
474 mlog_errno(ret);
475 ocfs2_refcount_tree_put(tree);
476 goto out;
477 }
478
479 ret = ocfs2_read_refcount_block(&tree->rf_ci, tree->rf_blkno,
480 &ref_root_bh);
481 if (ret) {
482 mlog_errno(ret);
483 ocfs2_unlock_refcount_tree(osb, tree, rw);
484 ocfs2_refcount_tree_put(tree);
485 goto out;
486 }
487
488 rb = (struct ocfs2_refcount_block *)ref_root_bh->b_data;
489
490
491
492
493
494
495
496
497
498 if (tree->rf_generation != le32_to_cpu(rb->rf_generation)) {
499 if (!tree->rf_removed) {
500 ocfs2_erase_refcount_tree_from_list(osb, tree);
501 tree->rf_removed = 1;
502 delete_tree = 1;
503 }
504
505 ocfs2_unlock_refcount_tree(osb, tree, rw);
506
507
508
509
510 if (delete_tree)
511 ocfs2_refcount_tree_put(tree);
512 brelse(ref_root_bh);
513 ref_root_bh = NULL;
514 goto again;
515 }
516
517 *ret_tree = tree;
518 if (ref_bh) {
519 *ref_bh = ref_root_bh;
520 ref_root_bh = NULL;
521 }
522out:
523 brelse(ref_root_bh);
524 return ret;
525}
526
527int ocfs2_lock_refcount_tree_by_inode(struct inode *inode, int rw,
528 struct ocfs2_refcount_tree **ret_tree,
529 struct buffer_head **ref_bh)
530{
531 int ret;
532 u64 ref_blkno;
533
534 ret = ocfs2_get_refcount_block(inode, &ref_blkno);
535 if (ret) {
536 mlog_errno(ret);
537 return ret;
538 }
539
540 return ocfs2_lock_refcount_tree(OCFS2_SB(inode->i_sb), ref_blkno,
541 rw, ret_tree, ref_bh);
542}
543
544void ocfs2_unlock_refcount_tree(struct ocfs2_super *osb,
545 struct ocfs2_refcount_tree *tree, int rw)
546{
547 if (rw)
548 up_write(&tree->rf_sem);
549 else
550 up_read(&tree->rf_sem);
551
552 ocfs2_refcount_unlock(tree, rw);
553 ocfs2_refcount_tree_put(tree);
554}
555
556void ocfs2_purge_refcount_trees(struct ocfs2_super *osb)
557{
558 struct rb_node *node;
559 struct ocfs2_refcount_tree *tree;
560 struct rb_root *root = &osb->osb_rf_lock_tree;
561
562 while ((node = rb_last(root)) != NULL) {
563 tree = rb_entry(node, struct ocfs2_refcount_tree, rf_node);
564
565 mlog(0, "Purge tree %llu\n",
566 (unsigned long long) tree->rf_blkno);
567
568 rb_erase(&tree->rf_node, root);
569 ocfs2_free_refcount_tree(tree);
570 }
571}
572
573
574
575
576
577static int ocfs2_create_refcount_tree(struct inode *inode,
578 struct buffer_head *di_bh)
579{
580 int ret;
581 handle_t *handle = NULL;
582 struct ocfs2_alloc_context *meta_ac = NULL;
583 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
584 struct ocfs2_inode_info *oi = OCFS2_I(inode);
585 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
586 struct buffer_head *new_bh = NULL;
587 struct ocfs2_refcount_block *rb;
588 struct ocfs2_refcount_tree *new_tree = NULL, *tree = NULL;
589 u16 suballoc_bit_start;
590 u32 num_got;
591 u64 first_blkno;
592
593 BUG_ON(oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL);
594
595 mlog(0, "create tree for inode %lu\n", inode->i_ino);
596
597 ret = ocfs2_reserve_new_metadata_blocks(osb, 1, &meta_ac);
598 if (ret) {
599 mlog_errno(ret);
600 goto out;
601 }
602
603 handle = ocfs2_start_trans(osb, OCFS2_REFCOUNT_TREE_CREATE_CREDITS);
604 if (IS_ERR(handle)) {
605 ret = PTR_ERR(handle);
606 mlog_errno(ret);
607 goto out;
608 }
609
610 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
611 OCFS2_JOURNAL_ACCESS_WRITE);
612 if (ret) {
613 mlog_errno(ret);
614 goto out_commit;
615 }
616
617 ret = ocfs2_claim_metadata(osb, handle, meta_ac, 1,
618 &suballoc_bit_start, &num_got,
619 &first_blkno);
620 if (ret) {
621 mlog_errno(ret);
622 goto out_commit;
623 }
624
625 new_tree = ocfs2_allocate_refcount_tree(osb, first_blkno);
626 if (!new_tree) {
627 ret = -ENOMEM;
628 mlog_errno(ret);
629 goto out_commit;
630 }
631
632 new_bh = sb_getblk(inode->i_sb, first_blkno);
633 ocfs2_set_new_buffer_uptodate(&new_tree->rf_ci, new_bh);
634
635 ret = ocfs2_journal_access_rb(handle, &new_tree->rf_ci, new_bh,
636 OCFS2_JOURNAL_ACCESS_CREATE);
637 if (ret) {
638 mlog_errno(ret);
639 goto out_commit;
640 }
641
642
643 rb = (struct ocfs2_refcount_block *)new_bh->b_data;
644 memset(rb, 0, inode->i_sb->s_blocksize);
645 strcpy((void *)rb, OCFS2_REFCOUNT_BLOCK_SIGNATURE);
646 rb->rf_suballoc_slot = cpu_to_le16(osb->slot_num);
647 rb->rf_suballoc_bit = cpu_to_le16(suballoc_bit_start);
648 rb->rf_fs_generation = cpu_to_le32(osb->fs_generation);
649 rb->rf_blkno = cpu_to_le64(first_blkno);
650 rb->rf_count = cpu_to_le32(1);
651 rb->rf_records.rl_count =
652 cpu_to_le16(ocfs2_refcount_recs_per_rb(osb->sb));
653 spin_lock(&osb->osb_lock);
654 rb->rf_generation = osb->s_next_generation++;
655 spin_unlock(&osb->osb_lock);
656
657 ocfs2_journal_dirty(handle, new_bh);
658
659 spin_lock(&oi->ip_lock);
660 oi->ip_dyn_features |= OCFS2_HAS_REFCOUNT_FL;
661 di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
662 di->i_refcount_loc = cpu_to_le64(first_blkno);
663 spin_unlock(&oi->ip_lock);
664
665 mlog(0, "created tree for inode %lu, refblock %llu\n",
666 inode->i_ino, (unsigned long long)first_blkno);
667
668 ocfs2_journal_dirty(handle, di_bh);
669
670
671
672
673
674 new_tree->rf_generation = le32_to_cpu(rb->rf_generation);
675 ocfs2_init_refcount_tree_lock(osb, new_tree, first_blkno,
676 new_tree->rf_generation);
677
678 spin_lock(&osb->osb_lock);
679 tree = ocfs2_find_refcount_tree(osb, first_blkno);
680
681
682
683
684
685
686
687 BUG_ON(tree && tree->rf_generation == new_tree->rf_generation);
688 if (tree)
689 ocfs2_erase_refcount_tree_from_list_no_lock(osb, tree);
690 ocfs2_insert_refcount_tree(osb, new_tree);
691 spin_unlock(&osb->osb_lock);
692 new_tree = NULL;
693 if (tree)
694 ocfs2_refcount_tree_put(tree);
695
696out_commit:
697 ocfs2_commit_trans(osb, handle);
698
699out:
700 if (new_tree) {
701 ocfs2_metadata_cache_exit(&new_tree->rf_ci);
702 kfree(new_tree);
703 }
704
705 brelse(new_bh);
706 if (meta_ac)
707 ocfs2_free_alloc_context(meta_ac);
708
709 return ret;
710}
711
712static int ocfs2_set_refcount_tree(struct inode *inode,
713 struct buffer_head *di_bh,
714 u64 refcount_loc)
715{
716 int ret;
717 handle_t *handle = NULL;
718 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
719 struct ocfs2_inode_info *oi = OCFS2_I(inode);
720 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
721 struct buffer_head *ref_root_bh = NULL;
722 struct ocfs2_refcount_block *rb;
723 struct ocfs2_refcount_tree *ref_tree;
724
725 BUG_ON(oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL);
726
727 ret = ocfs2_lock_refcount_tree(osb, refcount_loc, 1,
728 &ref_tree, &ref_root_bh);
729 if (ret) {
730 mlog_errno(ret);
731 return ret;
732 }
733
734 handle = ocfs2_start_trans(osb, OCFS2_REFCOUNT_TREE_SET_CREDITS);
735 if (IS_ERR(handle)) {
736 ret = PTR_ERR(handle);
737 mlog_errno(ret);
738 goto out;
739 }
740
741 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
742 OCFS2_JOURNAL_ACCESS_WRITE);
743 if (ret) {
744 mlog_errno(ret);
745 goto out_commit;
746 }
747
748 ret = ocfs2_journal_access_rb(handle, &ref_tree->rf_ci, ref_root_bh,
749 OCFS2_JOURNAL_ACCESS_WRITE);
750 if (ret) {
751 mlog_errno(ret);
752 goto out_commit;
753 }
754
755 rb = (struct ocfs2_refcount_block *)ref_root_bh->b_data;
756 le32_add_cpu(&rb->rf_count, 1);
757
758 ocfs2_journal_dirty(handle, ref_root_bh);
759
760 spin_lock(&oi->ip_lock);
761 oi->ip_dyn_features |= OCFS2_HAS_REFCOUNT_FL;
762 di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
763 di->i_refcount_loc = cpu_to_le64(refcount_loc);
764 spin_unlock(&oi->ip_lock);
765 ocfs2_journal_dirty(handle, di_bh);
766
767out_commit:
768 ocfs2_commit_trans(osb, handle);
769out:
770 ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
771 brelse(ref_root_bh);
772
773 return ret;
774}
775
776int ocfs2_remove_refcount_tree(struct inode *inode, struct buffer_head *di_bh)
777{
778 int ret, delete_tree = 0;
779 handle_t *handle = NULL;
780 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
781 struct ocfs2_inode_info *oi = OCFS2_I(inode);
782 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
783 struct ocfs2_refcount_block *rb;
784 struct inode *alloc_inode = NULL;
785 struct buffer_head *alloc_bh = NULL;
786 struct buffer_head *blk_bh = NULL;
787 struct ocfs2_refcount_tree *ref_tree;
788 int credits = OCFS2_REFCOUNT_TREE_REMOVE_CREDITS;
789 u64 blk = 0, bg_blkno = 0, ref_blkno = le64_to_cpu(di->i_refcount_loc);
790 u16 bit = 0;
791
792 if (!(oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL))
793 return 0;
794
795 BUG_ON(!ref_blkno);
796 ret = ocfs2_lock_refcount_tree(osb, ref_blkno, 1, &ref_tree, &blk_bh);
797 if (ret) {
798 mlog_errno(ret);
799 return ret;
800 }
801
802 rb = (struct ocfs2_refcount_block *)blk_bh->b_data;
803
804
805
806
807
808 if (le32_to_cpu(rb->rf_count) == 1) {
809 blk = le64_to_cpu(rb->rf_blkno);
810 bit = le16_to_cpu(rb->rf_suballoc_bit);
811 bg_blkno = ocfs2_which_suballoc_group(blk, bit);
812
813 alloc_inode = ocfs2_get_system_file_inode(osb,
814 EXTENT_ALLOC_SYSTEM_INODE,
815 le16_to_cpu(rb->rf_suballoc_slot));
816 if (!alloc_inode) {
817 ret = -ENOMEM;
818 mlog_errno(ret);
819 goto out;
820 }
821 mutex_lock(&alloc_inode->i_mutex);
822
823 ret = ocfs2_inode_lock(alloc_inode, &alloc_bh, 1);
824 if (ret) {
825 mlog_errno(ret);
826 goto out_mutex;
827 }
828
829 credits += OCFS2_SUBALLOC_FREE;
830 }
831
832 handle = ocfs2_start_trans(osb, credits);
833 if (IS_ERR(handle)) {
834 ret = PTR_ERR(handle);
835 mlog_errno(ret);
836 goto out_unlock;
837 }
838
839 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
840 OCFS2_JOURNAL_ACCESS_WRITE);
841 if (ret) {
842 mlog_errno(ret);
843 goto out_commit;
844 }
845
846 ret = ocfs2_journal_access_rb(handle, &ref_tree->rf_ci, blk_bh,
847 OCFS2_JOURNAL_ACCESS_WRITE);
848 if (ret) {
849 mlog_errno(ret);
850 goto out_commit;
851 }
852
853 spin_lock(&oi->ip_lock);
854 oi->ip_dyn_features &= ~OCFS2_HAS_REFCOUNT_FL;
855 di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
856 di->i_refcount_loc = 0;
857 spin_unlock(&oi->ip_lock);
858 ocfs2_journal_dirty(handle, di_bh);
859
860 le32_add_cpu(&rb->rf_count , -1);
861 ocfs2_journal_dirty(handle, blk_bh);
862
863 if (!rb->rf_count) {
864 delete_tree = 1;
865 ocfs2_erase_refcount_tree_from_list(osb, ref_tree);
866 ret = ocfs2_free_suballoc_bits(handle, alloc_inode,
867 alloc_bh, bit, bg_blkno, 1);
868 if (ret)
869 mlog_errno(ret);
870 }
871
872out_commit:
873 ocfs2_commit_trans(osb, handle);
874out_unlock:
875 if (alloc_inode) {
876 ocfs2_inode_unlock(alloc_inode, 1);
877 brelse(alloc_bh);
878 }
879out_mutex:
880 if (alloc_inode) {
881 mutex_unlock(&alloc_inode->i_mutex);
882 iput(alloc_inode);
883 }
884out:
885 ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
886 if (delete_tree)
887 ocfs2_refcount_tree_put(ref_tree);
888 brelse(blk_bh);
889
890 return ret;
891}
892
893static void ocfs2_find_refcount_rec_in_rl(struct ocfs2_caching_info *ci,
894 struct buffer_head *ref_leaf_bh,
895 u64 cpos, unsigned int len,
896 struct ocfs2_refcount_rec *ret_rec,
897 int *index)
898{
899 int i = 0;
900 struct ocfs2_refcount_block *rb =
901 (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
902 struct ocfs2_refcount_rec *rec = NULL;
903
904 for (; i < le16_to_cpu(rb->rf_records.rl_used); i++) {
905 rec = &rb->rf_records.rl_recs[i];
906
907 if (le64_to_cpu(rec->r_cpos) +
908 le32_to_cpu(rec->r_clusters) <= cpos)
909 continue;
910 else if (le64_to_cpu(rec->r_cpos) > cpos)
911 break;
912
913
914 if (ret_rec)
915 *ret_rec = *rec;
916 goto out;
917 }
918
919 if (ret_rec) {
920
921 ret_rec->r_cpos = cpu_to_le64(cpos);
922 ret_rec->r_refcount = 0;
923 if (i < le16_to_cpu(rb->rf_records.rl_used) &&
924 le64_to_cpu(rec->r_cpos) < cpos + len)
925 ret_rec->r_clusters =
926 cpu_to_le32(le64_to_cpu(rec->r_cpos) - cpos);
927 else
928 ret_rec->r_clusters = cpu_to_le32(len);
929 }
930
931out:
932 *index = i;
933}
934
935
936
937
938
939
940
941
942int ocfs2_try_remove_refcount_tree(struct inode *inode,
943 struct buffer_head *di_bh)
944{
945 int ret;
946 struct ocfs2_inode_info *oi = OCFS2_I(inode);
947 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
948
949 down_write(&oi->ip_xattr_sem);
950 down_write(&oi->ip_alloc_sem);
951
952 if (oi->ip_clusters)
953 goto out;
954
955 if ((oi->ip_dyn_features & OCFS2_HAS_XATTR_FL) && di->i_xattr_loc)
956 goto out;
957
958 if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL &&
959 ocfs2_has_inline_xattr_value_outside(inode, di))
960 goto out;
961
962 ret = ocfs2_remove_refcount_tree(inode, di_bh);
963 if (ret)
964 mlog_errno(ret);
965out:
966 up_write(&oi->ip_alloc_sem);
967 up_write(&oi->ip_xattr_sem);
968 return 0;
969}
970
971
972
973
974
975
976
977
978static int ocfs2_get_refcount_rec(struct ocfs2_caching_info *ci,
979 struct buffer_head *ref_root_bh,
980 u64 cpos, unsigned int len,
981 struct ocfs2_refcount_rec *ret_rec,
982 int *index,
983 struct buffer_head **ret_bh)
984{
985 int ret = 0, i, found;
986 u32 low_cpos;
987 struct ocfs2_extent_list *el;
988 struct ocfs2_extent_rec *tmp, *rec = NULL;
989 struct ocfs2_extent_block *eb;
990 struct buffer_head *eb_bh = NULL, *ref_leaf_bh = NULL;
991 struct super_block *sb = ocfs2_metadata_cache_get_super(ci);
992 struct ocfs2_refcount_block *rb =
993 (struct ocfs2_refcount_block *)ref_root_bh->b_data;
994
995 if (!(le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL)) {
996 ocfs2_find_refcount_rec_in_rl(ci, ref_root_bh, cpos, len,
997 ret_rec, index);
998 *ret_bh = ref_root_bh;
999 get_bh(ref_root_bh);
1000 return 0;
1001 }
1002
1003 el = &rb->rf_list;
1004 low_cpos = cpos & OCFS2_32BIT_POS_MASK;
1005
1006 if (el->l_tree_depth) {
1007 ret = ocfs2_find_leaf(ci, el, low_cpos, &eb_bh);
1008 if (ret) {
1009 mlog_errno(ret);
1010 goto out;
1011 }
1012
1013 eb = (struct ocfs2_extent_block *) eb_bh->b_data;
1014 el = &eb->h_list;
1015
1016 if (el->l_tree_depth) {
1017 ocfs2_error(sb,
1018 "refcount tree %llu has non zero tree "
1019 "depth in leaf btree tree block %llu\n",
1020 (unsigned long long)ocfs2_metadata_cache_owner(ci),
1021 (unsigned long long)eb_bh->b_blocknr);
1022 ret = -EROFS;
1023 goto out;
1024 }
1025 }
1026
1027 found = 0;
1028 for (i = le16_to_cpu(el->l_next_free_rec) - 1; i >= 0; i--) {
1029 rec = &el->l_recs[i];
1030
1031 if (le32_to_cpu(rec->e_cpos) <= low_cpos) {
1032 found = 1;
1033 break;
1034 }
1035 }
1036
1037
1038 if (found && i < le16_to_cpu(el->l_next_free_rec) - 1) {
1039 tmp = &el->l_recs[i+1];
1040
1041 if (le32_to_cpu(tmp->e_cpos) < cpos + len)
1042 len = le32_to_cpu(tmp->e_cpos) - cpos;
1043 }
1044
1045 ret = ocfs2_read_refcount_block(ci, le64_to_cpu(rec->e_blkno),
1046 &ref_leaf_bh);
1047 if (ret) {
1048 mlog_errno(ret);
1049 goto out;
1050 }
1051
1052 ocfs2_find_refcount_rec_in_rl(ci, ref_leaf_bh, cpos, len,
1053 ret_rec, index);
1054 *ret_bh = ref_leaf_bh;
1055out:
1056 brelse(eb_bh);
1057 return ret;
1058}
1059
1060enum ocfs2_ref_rec_contig {
1061 REF_CONTIG_NONE = 0,
1062 REF_CONTIG_LEFT,
1063 REF_CONTIG_RIGHT,
1064 REF_CONTIG_LEFTRIGHT,
1065};
1066
1067static enum ocfs2_ref_rec_contig
1068 ocfs2_refcount_rec_adjacent(struct ocfs2_refcount_block *rb,
1069 int index)
1070{
1071 if ((rb->rf_records.rl_recs[index].r_refcount ==
1072 rb->rf_records.rl_recs[index + 1].r_refcount) &&
1073 (le64_to_cpu(rb->rf_records.rl_recs[index].r_cpos) +
1074 le32_to_cpu(rb->rf_records.rl_recs[index].r_clusters) ==
1075 le64_to_cpu(rb->rf_records.rl_recs[index + 1].r_cpos)))
1076 return REF_CONTIG_RIGHT;
1077
1078 return REF_CONTIG_NONE;
1079}
1080
1081static enum ocfs2_ref_rec_contig
1082 ocfs2_refcount_rec_contig(struct ocfs2_refcount_block *rb,
1083 int index)
1084{
1085 enum ocfs2_ref_rec_contig ret = REF_CONTIG_NONE;
1086
1087 if (index < le16_to_cpu(rb->rf_records.rl_used) - 1)
1088 ret = ocfs2_refcount_rec_adjacent(rb, index);
1089
1090 if (index > 0) {
1091 enum ocfs2_ref_rec_contig tmp;
1092
1093 tmp = ocfs2_refcount_rec_adjacent(rb, index - 1);
1094
1095 if (tmp == REF_CONTIG_RIGHT) {
1096 if (ret == REF_CONTIG_RIGHT)
1097 ret = REF_CONTIG_LEFTRIGHT;
1098 else
1099 ret = REF_CONTIG_LEFT;
1100 }
1101 }
1102
1103 return ret;
1104}
1105
1106static void ocfs2_rotate_refcount_rec_left(struct ocfs2_refcount_block *rb,
1107 int index)
1108{
1109 BUG_ON(rb->rf_records.rl_recs[index].r_refcount !=
1110 rb->rf_records.rl_recs[index+1].r_refcount);
1111
1112 le32_add_cpu(&rb->rf_records.rl_recs[index].r_clusters,
1113 le32_to_cpu(rb->rf_records.rl_recs[index+1].r_clusters));
1114
1115 if (index < le16_to_cpu(rb->rf_records.rl_used) - 2)
1116 memmove(&rb->rf_records.rl_recs[index + 1],
1117 &rb->rf_records.rl_recs[index + 2],
1118 sizeof(struct ocfs2_refcount_rec) *
1119 (le16_to_cpu(rb->rf_records.rl_used) - index - 2));
1120
1121 memset(&rb->rf_records.rl_recs[le16_to_cpu(rb->rf_records.rl_used) - 1],
1122 0, sizeof(struct ocfs2_refcount_rec));
1123 le16_add_cpu(&rb->rf_records.rl_used, -1);
1124}
1125
1126
1127
1128
1129static void ocfs2_refcount_rec_merge(struct ocfs2_refcount_block *rb,
1130 int index)
1131{
1132 enum ocfs2_ref_rec_contig contig =
1133 ocfs2_refcount_rec_contig(rb, index);
1134
1135 if (contig == REF_CONTIG_NONE)
1136 return;
1137
1138 if (contig == REF_CONTIG_LEFT || contig == REF_CONTIG_LEFTRIGHT) {
1139 BUG_ON(index == 0);
1140 index--;
1141 }
1142
1143 ocfs2_rotate_refcount_rec_left(rb, index);
1144
1145 if (contig == REF_CONTIG_LEFTRIGHT)
1146 ocfs2_rotate_refcount_rec_left(rb, index);
1147}
1148
1149
1150
1151
1152
1153static int ocfs2_change_refcount_rec(handle_t *handle,
1154 struct ocfs2_caching_info *ci,
1155 struct buffer_head *ref_leaf_bh,
1156 int index, int merge, int change)
1157{
1158 int ret;
1159 struct ocfs2_refcount_block *rb =
1160 (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
1161 struct ocfs2_refcount_list *rl = &rb->rf_records;
1162 struct ocfs2_refcount_rec *rec = &rl->rl_recs[index];
1163
1164 ret = ocfs2_journal_access_rb(handle, ci, ref_leaf_bh,
1165 OCFS2_JOURNAL_ACCESS_WRITE);
1166 if (ret) {
1167 mlog_errno(ret);
1168 goto out;
1169 }
1170
1171 mlog(0, "change index %d, old count %u, change %d\n", index,
1172 le32_to_cpu(rec->r_refcount), change);
1173 le32_add_cpu(&rec->r_refcount, change);
1174
1175 if (!rec->r_refcount) {
1176 if (index != le16_to_cpu(rl->rl_used) - 1) {
1177 memmove(rec, rec + 1,
1178 (le16_to_cpu(rl->rl_used) - index - 1) *
1179 sizeof(struct ocfs2_refcount_rec));
1180 memset(&rl->rl_recs[le16_to_cpu(rl->rl_used) - 1],
1181 0, sizeof(struct ocfs2_refcount_rec));
1182 }
1183
1184 le16_add_cpu(&rl->rl_used, -1);
1185 } else if (merge)
1186 ocfs2_refcount_rec_merge(rb, index);
1187
1188 ret = ocfs2_journal_dirty(handle, ref_leaf_bh);
1189 if (ret)
1190 mlog_errno(ret);
1191out:
1192 return ret;
1193}
1194
1195static int ocfs2_expand_inline_ref_root(handle_t *handle,
1196 struct ocfs2_caching_info *ci,
1197 struct buffer_head *ref_root_bh,
1198 struct buffer_head **ref_leaf_bh,
1199 struct ocfs2_alloc_context *meta_ac)
1200{
1201 int ret;
1202 u16 suballoc_bit_start;
1203 u32 num_got;
1204 u64 blkno;
1205 struct super_block *sb = ocfs2_metadata_cache_get_super(ci);
1206 struct buffer_head *new_bh = NULL;
1207 struct ocfs2_refcount_block *new_rb;
1208 struct ocfs2_refcount_block *root_rb =
1209 (struct ocfs2_refcount_block *)ref_root_bh->b_data;
1210
1211 ret = ocfs2_journal_access_rb(handle, ci, ref_root_bh,
1212 OCFS2_JOURNAL_ACCESS_WRITE);
1213 if (ret) {
1214 mlog_errno(ret);
1215 goto out;
1216 }
1217
1218 ret = ocfs2_claim_metadata(OCFS2_SB(sb), handle, meta_ac, 1,
1219 &suballoc_bit_start, &num_got,
1220 &blkno);
1221 if (ret) {
1222 mlog_errno(ret);
1223 goto out;
1224 }
1225
1226 new_bh = sb_getblk(sb, blkno);
1227 if (new_bh == NULL) {
1228 ret = -EIO;
1229 mlog_errno(ret);
1230 goto out;
1231 }
1232 ocfs2_set_new_buffer_uptodate(ci, new_bh);
1233
1234 ret = ocfs2_journal_access_rb(handle, ci, new_bh,
1235 OCFS2_JOURNAL_ACCESS_CREATE);
1236 if (ret) {
1237 mlog_errno(ret);
1238 goto out;
1239 }
1240
1241
1242
1243
1244
1245
1246 memcpy(new_bh->b_data, ref_root_bh->b_data, sb->s_blocksize);
1247
1248 new_rb = (struct ocfs2_refcount_block *)new_bh->b_data;
1249 new_rb->rf_suballoc_slot = cpu_to_le16(OCFS2_SB(sb)->slot_num);
1250 new_rb->rf_suballoc_bit = cpu_to_le16(suballoc_bit_start);
1251 new_rb->rf_blkno = cpu_to_le64(blkno);
1252 new_rb->rf_cpos = cpu_to_le32(0);
1253 new_rb->rf_parent = cpu_to_le64(ref_root_bh->b_blocknr);
1254 new_rb->rf_flags = cpu_to_le32(OCFS2_REFCOUNT_LEAF_FL);
1255 ocfs2_journal_dirty(handle, new_bh);
1256
1257
1258 memset(&root_rb->rf_list, 0, sb->s_blocksize -
1259 offsetof(struct ocfs2_refcount_block, rf_list));
1260 root_rb->rf_list.l_count = cpu_to_le16(ocfs2_extent_recs_per_rb(sb));
1261 root_rb->rf_clusters = cpu_to_le32(1);
1262 root_rb->rf_list.l_next_free_rec = cpu_to_le16(1);
1263 root_rb->rf_list.l_recs[0].e_blkno = cpu_to_le64(blkno);
1264 root_rb->rf_list.l_recs[0].e_leaf_clusters = cpu_to_le16(1);
1265 root_rb->rf_flags = cpu_to_le32(OCFS2_REFCOUNT_TREE_FL);
1266
1267 ocfs2_journal_dirty(handle, ref_root_bh);
1268
1269 mlog(0, "new leaf block %llu, used %u\n", (unsigned long long)blkno,
1270 le16_to_cpu(new_rb->rf_records.rl_used));
1271
1272 *ref_leaf_bh = new_bh;
1273 new_bh = NULL;
1274out:
1275 brelse(new_bh);
1276 return ret;
1277}
1278
1279static int ocfs2_refcount_rec_no_intersect(struct ocfs2_refcount_rec *prev,
1280 struct ocfs2_refcount_rec *next)
1281{
1282 if (ocfs2_get_ref_rec_low_cpos(prev) + le32_to_cpu(prev->r_clusters) <=
1283 ocfs2_get_ref_rec_low_cpos(next))
1284 return 1;
1285
1286 return 0;
1287}
1288
1289static int cmp_refcount_rec_by_low_cpos(const void *a, const void *b)
1290{
1291 const struct ocfs2_refcount_rec *l = a, *r = b;
1292 u32 l_cpos = ocfs2_get_ref_rec_low_cpos(l);
1293 u32 r_cpos = ocfs2_get_ref_rec_low_cpos(r);
1294
1295 if (l_cpos > r_cpos)
1296 return 1;
1297 if (l_cpos < r_cpos)
1298 return -1;
1299 return 0;
1300}
1301
1302static int cmp_refcount_rec_by_cpos(const void *a, const void *b)
1303{
1304 const struct ocfs2_refcount_rec *l = a, *r = b;
1305 u64 l_cpos = le64_to_cpu(l->r_cpos);
1306 u64 r_cpos = le64_to_cpu(r->r_cpos);
1307
1308 if (l_cpos > r_cpos)
1309 return 1;
1310 if (l_cpos < r_cpos)
1311 return -1;
1312 return 0;
1313}
1314
1315static void swap_refcount_rec(void *a, void *b, int size)
1316{
1317 struct ocfs2_refcount_rec *l = a, *r = b, tmp;
1318
1319 tmp = *(struct ocfs2_refcount_rec *)l;
1320 *(struct ocfs2_refcount_rec *)l =
1321 *(struct ocfs2_refcount_rec *)r;
1322 *(struct ocfs2_refcount_rec *)r = tmp;
1323}
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334static int ocfs2_find_refcount_split_pos(struct ocfs2_refcount_list *rl,
1335 u32 *split_pos, int *split_index)
1336{
1337 int num_used = le16_to_cpu(rl->rl_used);
1338 int delta, middle = num_used / 2;
1339
1340 for (delta = 0; delta < middle; delta++) {
1341
1342 if (ocfs2_refcount_rec_no_intersect(
1343 &rl->rl_recs[middle - delta - 1],
1344 &rl->rl_recs[middle - delta])) {
1345 *split_index = middle - delta;
1346 break;
1347 }
1348
1349
1350 if ((middle + delta + 1) == num_used)
1351 continue;
1352
1353
1354 if (ocfs2_refcount_rec_no_intersect(
1355 &rl->rl_recs[middle + delta],
1356 &rl->rl_recs[middle + delta + 1])) {
1357 *split_index = middle + delta + 1;
1358 break;
1359 }
1360 }
1361
1362 if (delta >= middle)
1363 return -ENOSPC;
1364
1365 *split_pos = ocfs2_get_ref_rec_low_cpos(&rl->rl_recs[*split_index]);
1366 return 0;
1367}
1368
1369static int ocfs2_divide_leaf_refcount_block(struct buffer_head *ref_leaf_bh,
1370 struct buffer_head *new_bh,
1371 u32 *split_cpos)
1372{
1373 int split_index = 0, num_moved, ret;
1374 u32 cpos = 0;
1375 struct ocfs2_refcount_block *rb =
1376 (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
1377 struct ocfs2_refcount_list *rl = &rb->rf_records;
1378 struct ocfs2_refcount_block *new_rb =
1379 (struct ocfs2_refcount_block *)new_bh->b_data;
1380 struct ocfs2_refcount_list *new_rl = &new_rb->rf_records;
1381
1382 mlog(0, "split old leaf refcount block %llu, count = %u, used = %u\n",
1383 (unsigned long long)ref_leaf_bh->b_blocknr,
1384 le32_to_cpu(rl->rl_count), le32_to_cpu(rl->rl_used));
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398 sort(&rl->rl_recs, le16_to_cpu(rl->rl_used),
1399 sizeof(struct ocfs2_refcount_rec),
1400 cmp_refcount_rec_by_low_cpos, swap_refcount_rec);
1401
1402 ret = ocfs2_find_refcount_split_pos(rl, &cpos, &split_index);
1403 if (ret) {
1404 mlog_errno(ret);
1405 return ret;
1406 }
1407
1408 new_rb->rf_cpos = cpu_to_le32(cpos);
1409
1410
1411 num_moved = le16_to_cpu(rl->rl_used) - split_index;
1412 memcpy(new_rl->rl_recs, &rl->rl_recs[split_index],
1413 num_moved * sizeof(struct ocfs2_refcount_rec));
1414
1415
1416 memset(&rl->rl_recs[split_index], 0,
1417 num_moved * sizeof(struct ocfs2_refcount_rec));
1418
1419
1420 le16_add_cpu(&rl->rl_used, -num_moved);
1421 new_rl->rl_used = cpu_to_le32(num_moved);
1422
1423 sort(&rl->rl_recs, le16_to_cpu(rl->rl_used),
1424 sizeof(struct ocfs2_refcount_rec),
1425 cmp_refcount_rec_by_cpos, swap_refcount_rec);
1426
1427 sort(&new_rl->rl_recs, le16_to_cpu(new_rl->rl_used),
1428 sizeof(struct ocfs2_refcount_rec),
1429 cmp_refcount_rec_by_cpos, swap_refcount_rec);
1430
1431 *split_cpos = cpos;
1432 return 0;
1433}
1434
1435static int ocfs2_new_leaf_refcount_block(handle_t *handle,
1436 struct ocfs2_caching_info *ci,
1437 struct buffer_head *ref_root_bh,
1438 struct buffer_head *ref_leaf_bh,
1439 struct ocfs2_alloc_context *meta_ac)
1440{
1441 int ret;
1442 u16 suballoc_bit_start;
1443 u32 num_got, new_cpos;
1444 u64 blkno;
1445 struct super_block *sb = ocfs2_metadata_cache_get_super(ci);
1446 struct ocfs2_refcount_block *root_rb =
1447 (struct ocfs2_refcount_block *)ref_root_bh->b_data;
1448 struct buffer_head *new_bh = NULL;
1449 struct ocfs2_refcount_block *new_rb;
1450 struct ocfs2_extent_tree ref_et;
1451
1452 BUG_ON(!(le32_to_cpu(root_rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL));
1453
1454 ret = ocfs2_journal_access_rb(handle, ci, ref_root_bh,
1455 OCFS2_JOURNAL_ACCESS_WRITE);
1456 if (ret) {
1457 mlog_errno(ret);
1458 goto out;
1459 }
1460
1461 ret = ocfs2_journal_access_rb(handle, ci, ref_leaf_bh,
1462 OCFS2_JOURNAL_ACCESS_WRITE);
1463 if (ret) {
1464 mlog_errno(ret);
1465 goto out;
1466 }
1467
1468 ret = ocfs2_claim_metadata(OCFS2_SB(sb), handle, meta_ac, 1,
1469 &suballoc_bit_start, &num_got,
1470 &blkno);
1471 if (ret) {
1472 mlog_errno(ret);
1473 goto out;
1474 }
1475
1476 new_bh = sb_getblk(sb, blkno);
1477 if (new_bh == NULL) {
1478 ret = -EIO;
1479 mlog_errno(ret);
1480 goto out;
1481 }
1482 ocfs2_set_new_buffer_uptodate(ci, new_bh);
1483
1484 ret = ocfs2_journal_access_rb(handle, ci, new_bh,
1485 OCFS2_JOURNAL_ACCESS_CREATE);
1486 if (ret) {
1487 mlog_errno(ret);
1488 goto out;
1489 }
1490
1491
1492 new_rb = (struct ocfs2_refcount_block *)new_bh->b_data;
1493 memset(new_rb, 0, sb->s_blocksize);
1494 strcpy((void *)new_rb, OCFS2_REFCOUNT_BLOCK_SIGNATURE);
1495 new_rb->rf_suballoc_slot = cpu_to_le16(OCFS2_SB(sb)->slot_num);
1496 new_rb->rf_suballoc_bit = cpu_to_le16(suballoc_bit_start);
1497 new_rb->rf_fs_generation = cpu_to_le32(OCFS2_SB(sb)->fs_generation);
1498 new_rb->rf_blkno = cpu_to_le64(blkno);
1499 new_rb->rf_parent = cpu_to_le64(ref_root_bh->b_blocknr);
1500 new_rb->rf_flags = cpu_to_le32(OCFS2_REFCOUNT_LEAF_FL);
1501 new_rb->rf_records.rl_count =
1502 cpu_to_le16(ocfs2_refcount_recs_per_rb(sb));
1503 new_rb->rf_generation = root_rb->rf_generation;
1504
1505 ret = ocfs2_divide_leaf_refcount_block(ref_leaf_bh, new_bh, &new_cpos);
1506 if (ret) {
1507 mlog_errno(ret);
1508 goto out;
1509 }
1510
1511 ocfs2_journal_dirty(handle, ref_leaf_bh);
1512 ocfs2_journal_dirty(handle, new_bh);
1513
1514 ocfs2_init_refcount_extent_tree(&ref_et, ci, ref_root_bh);
1515
1516 mlog(0, "insert new leaf block %llu at %u\n",
1517 (unsigned long long)new_bh->b_blocknr, new_cpos);
1518
1519
1520 ret = ocfs2_insert_extent(handle, &ref_et, new_cpos, new_bh->b_blocknr,
1521 1, 0, meta_ac);
1522 if (ret)
1523 mlog_errno(ret);
1524
1525out:
1526 brelse(new_bh);
1527 return ret;
1528}
1529
1530static int ocfs2_expand_refcount_tree(handle_t *handle,
1531 struct ocfs2_caching_info *ci,
1532 struct buffer_head *ref_root_bh,
1533 struct buffer_head *ref_leaf_bh,
1534 struct ocfs2_alloc_context *meta_ac)
1535{
1536 int ret;
1537 struct buffer_head *expand_bh = NULL;
1538
1539 if (ref_root_bh == ref_leaf_bh) {
1540
1541
1542
1543
1544 ret = ocfs2_expand_inline_ref_root(handle, ci, ref_root_bh,
1545 &expand_bh, meta_ac);
1546 if (ret) {
1547 mlog_errno(ret);
1548 goto out;
1549 }
1550 } else {
1551 expand_bh = ref_leaf_bh;
1552 get_bh(expand_bh);
1553 }
1554
1555
1556
1557 ret = ocfs2_new_leaf_refcount_block(handle, ci, ref_root_bh,
1558 expand_bh, meta_ac);
1559 if (ret)
1560 mlog_errno(ret);
1561out:
1562 brelse(expand_bh);
1563 return ret;
1564}
1565
1566
1567
1568
1569
1570
1571
1572static int ocfs2_adjust_refcount_rec(handle_t *handle,
1573 struct ocfs2_caching_info *ci,
1574 struct buffer_head *ref_root_bh,
1575 struct buffer_head *ref_leaf_bh,
1576 struct ocfs2_refcount_rec *rec)
1577{
1578 int ret = 0, i;
1579 u32 new_cpos, old_cpos;
1580 struct ocfs2_path *path = NULL;
1581 struct ocfs2_extent_tree et;
1582 struct ocfs2_refcount_block *rb =
1583 (struct ocfs2_refcount_block *)ref_root_bh->b_data;
1584 struct ocfs2_extent_list *el;
1585
1586 if (!(le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL))
1587 goto out;
1588
1589 rb = (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
1590 old_cpos = le32_to_cpu(rb->rf_cpos);
1591 new_cpos = le64_to_cpu(rec->r_cpos) & OCFS2_32BIT_POS_MASK;
1592 if (old_cpos <= new_cpos)
1593 goto out;
1594
1595 ocfs2_init_refcount_extent_tree(&et, ci, ref_root_bh);
1596
1597 path = ocfs2_new_path_from_et(&et);
1598 if (!path) {
1599 ret = -ENOMEM;
1600 mlog_errno(ret);
1601 goto out;
1602 }
1603
1604 ret = ocfs2_find_path(ci, path, old_cpos);
1605 if (ret) {
1606 mlog_errno(ret);
1607 goto out;
1608 }
1609
1610
1611
1612
1613
1614 ret = ocfs2_extend_trans(handle, handle->h_buffer_credits + 2);
1615 if (ret < 0) {
1616 mlog_errno(ret);
1617 goto out;
1618 }
1619
1620 ret = ocfs2_journal_access_rb(handle, ci, ref_leaf_bh,
1621 OCFS2_JOURNAL_ACCESS_WRITE);
1622 if (ret < 0) {
1623 mlog_errno(ret);
1624 goto out;
1625 }
1626
1627 ret = ocfs2_journal_access_eb(handle, ci, path_leaf_bh(path),
1628 OCFS2_JOURNAL_ACCESS_WRITE);
1629 if (ret < 0) {
1630 mlog_errno(ret);
1631 goto out;
1632 }
1633
1634
1635 el = path_leaf_el(path);
1636
1637 for (i = 0; i < le16_to_cpu(el->l_next_free_rec); i++)
1638 if (le32_to_cpu(el->l_recs[i].e_cpos) == old_cpos)
1639 break;
1640
1641 BUG_ON(i == le16_to_cpu(el->l_next_free_rec));
1642
1643 el->l_recs[i].e_cpos = cpu_to_le32(new_cpos);
1644
1645
1646 rb->rf_cpos = cpu_to_le32(new_cpos);
1647
1648 ocfs2_journal_dirty(handle, path_leaf_bh(path));
1649 ocfs2_journal_dirty(handle, ref_leaf_bh);
1650
1651out:
1652 ocfs2_free_path(path);
1653 return ret;
1654}
1655
1656static int ocfs2_insert_refcount_rec(handle_t *handle,
1657 struct ocfs2_caching_info *ci,
1658 struct buffer_head *ref_root_bh,
1659 struct buffer_head *ref_leaf_bh,
1660 struct ocfs2_refcount_rec *rec,
1661 int index, int merge,
1662 struct ocfs2_alloc_context *meta_ac)
1663{
1664 int ret;
1665 struct ocfs2_refcount_block *rb =
1666 (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
1667 struct ocfs2_refcount_list *rf_list = &rb->rf_records;
1668 struct buffer_head *new_bh = NULL;
1669
1670 BUG_ON(le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL);
1671
1672 if (rf_list->rl_used == rf_list->rl_count) {
1673 u64 cpos = le64_to_cpu(rec->r_cpos);
1674 u32 len = le32_to_cpu(rec->r_clusters);
1675
1676 ret = ocfs2_expand_refcount_tree(handle, ci, ref_root_bh,
1677 ref_leaf_bh, meta_ac);
1678 if (ret) {
1679 mlog_errno(ret);
1680 goto out;
1681 }
1682
1683 ret = ocfs2_get_refcount_rec(ci, ref_root_bh,
1684 cpos, len, NULL, &index,
1685 &new_bh);
1686 if (ret) {
1687 mlog_errno(ret);
1688 goto out;
1689 }
1690
1691 ref_leaf_bh = new_bh;
1692 rb = (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
1693 rf_list = &rb->rf_records;
1694 }
1695
1696 ret = ocfs2_journal_access_rb(handle, ci, ref_leaf_bh,
1697 OCFS2_JOURNAL_ACCESS_WRITE);
1698 if (ret) {
1699 mlog_errno(ret);
1700 goto out;
1701 }
1702
1703 if (index < le16_to_cpu(rf_list->rl_used))
1704 memmove(&rf_list->rl_recs[index + 1],
1705 &rf_list->rl_recs[index],
1706 (le16_to_cpu(rf_list->rl_used) - index) *
1707 sizeof(struct ocfs2_refcount_rec));
1708
1709 mlog(0, "insert refcount record start %llu, len %u, count %u "
1710 "to leaf block %llu at index %d\n",
1711 (unsigned long long)le64_to_cpu(rec->r_cpos),
1712 le32_to_cpu(rec->r_clusters), le32_to_cpu(rec->r_refcount),
1713 (unsigned long long)ref_leaf_bh->b_blocknr, index);
1714
1715 rf_list->rl_recs[index] = *rec;
1716
1717 le16_add_cpu(&rf_list->rl_used, 1);
1718
1719 if (merge)
1720 ocfs2_refcount_rec_merge(rb, index);
1721
1722 ret = ocfs2_journal_dirty(handle, ref_leaf_bh);
1723 if (ret) {
1724 mlog_errno(ret);
1725 goto out;
1726 }
1727
1728 if (index == 0) {
1729 ret = ocfs2_adjust_refcount_rec(handle, ci,
1730 ref_root_bh,
1731 ref_leaf_bh, rec);
1732 if (ret)
1733 mlog_errno(ret);
1734 }
1735out:
1736 brelse(new_bh);
1737 return ret;
1738}
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749static int ocfs2_split_refcount_rec(handle_t *handle,
1750 struct ocfs2_caching_info *ci,
1751 struct buffer_head *ref_root_bh,
1752 struct buffer_head *ref_leaf_bh,
1753 struct ocfs2_refcount_rec *split_rec,
1754 int index, int merge,
1755 struct ocfs2_alloc_context *meta_ac,
1756 struct ocfs2_cached_dealloc_ctxt *dealloc)
1757{
1758 int ret, recs_need;
1759 u32 len;
1760 struct ocfs2_refcount_block *rb =
1761 (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
1762 struct ocfs2_refcount_list *rf_list = &rb->rf_records;
1763 struct ocfs2_refcount_rec *orig_rec = &rf_list->rl_recs[index];
1764 struct ocfs2_refcount_rec *tail_rec = NULL;
1765 struct buffer_head *new_bh = NULL;
1766
1767 BUG_ON(le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL);
1768
1769 mlog(0, "original r_pos %llu, cluster %u, split %llu, cluster %u\n",
1770 le64_to_cpu(orig_rec->r_cpos), le32_to_cpu(orig_rec->r_clusters),
1771 le64_to_cpu(split_rec->r_cpos),
1772 le32_to_cpu(split_rec->r_clusters));
1773
1774
1775
1776
1777
1778
1779 if (!split_rec->r_refcount &&
1780 (split_rec->r_cpos == orig_rec->r_cpos ||
1781 le64_to_cpu(split_rec->r_cpos) +
1782 le32_to_cpu(split_rec->r_clusters) ==
1783 le64_to_cpu(orig_rec->r_cpos) + le32_to_cpu(orig_rec->r_clusters)))
1784 recs_need = 0;
1785 else
1786 recs_need = 1;
1787
1788
1789
1790
1791
1792 if (split_rec->r_refcount &&
1793 (split_rec->r_cpos != orig_rec->r_cpos &&
1794 le64_to_cpu(split_rec->r_cpos) +
1795 le32_to_cpu(split_rec->r_clusters) !=
1796 le64_to_cpu(orig_rec->r_cpos) + le32_to_cpu(orig_rec->r_clusters)))
1797 recs_need++;
1798
1799
1800 if (le16_to_cpu(rf_list->rl_used) + recs_need > rf_list->rl_count) {
1801 struct ocfs2_refcount_rec tmp_rec;
1802 u64 cpos = le64_to_cpu(orig_rec->r_cpos);
1803 len = le32_to_cpu(orig_rec->r_clusters);
1804 ret = ocfs2_expand_refcount_tree(handle, ci, ref_root_bh,
1805 ref_leaf_bh, meta_ac);
1806 if (ret) {
1807 mlog_errno(ret);
1808 goto out;
1809 }
1810
1811
1812
1813
1814
1815 ret = ocfs2_get_refcount_rec(ci, ref_root_bh,
1816 cpos, len, &tmp_rec, &index,
1817 &new_bh);
1818 if (ret) {
1819 mlog_errno(ret);
1820 goto out;
1821 }
1822
1823 ref_leaf_bh = new_bh;
1824 rb = (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
1825 rf_list = &rb->rf_records;
1826 orig_rec = &rf_list->rl_recs[index];
1827 }
1828
1829 ret = ocfs2_journal_access_rb(handle, ci, ref_leaf_bh,
1830 OCFS2_JOURNAL_ACCESS_WRITE);
1831 if (ret) {
1832 mlog_errno(ret);
1833 goto out;
1834 }
1835
1836
1837
1838
1839
1840
1841 if (index != le16_to_cpu(rf_list->rl_used) - 1)
1842 memmove(&rf_list->rl_recs[index + 1 + recs_need],
1843 &rf_list->rl_recs[index + 1],
1844 (le16_to_cpu(rf_list->rl_used) - index - 1) *
1845 sizeof(struct ocfs2_refcount_rec));
1846
1847 len = (le64_to_cpu(orig_rec->r_cpos) +
1848 le32_to_cpu(orig_rec->r_clusters)) -
1849 (le64_to_cpu(split_rec->r_cpos) +
1850 le32_to_cpu(split_rec->r_clusters));
1851
1852
1853
1854
1855
1856 if (len) {
1857 tail_rec = &rf_list->rl_recs[index + recs_need];
1858
1859 memcpy(tail_rec, orig_rec, sizeof(struct ocfs2_refcount_rec));
1860 le64_add_cpu(&tail_rec->r_cpos,
1861 le32_to_cpu(tail_rec->r_clusters) - len);
1862 tail_rec->r_clusters = le32_to_cpu(len);
1863 }
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874 if (split_rec->r_cpos != orig_rec->r_cpos && tail_rec != orig_rec) {
1875 len = le64_to_cpu(split_rec->r_cpos) -
1876 le64_to_cpu(orig_rec->r_cpos);
1877 orig_rec->r_clusters = cpu_to_le32(len);
1878 index++;
1879 }
1880
1881 le16_add_cpu(&rf_list->rl_used, recs_need);
1882
1883 if (split_rec->r_refcount) {
1884 rf_list->rl_recs[index] = *split_rec;
1885 mlog(0, "insert refcount record start %llu, len %u, count %u "
1886 "to leaf block %llu at index %d\n",
1887 (unsigned long long)le64_to_cpu(split_rec->r_cpos),
1888 le32_to_cpu(split_rec->r_clusters),
1889 le32_to_cpu(split_rec->r_refcount),
1890 (unsigned long long)ref_leaf_bh->b_blocknr, index);
1891
1892 if (merge)
1893 ocfs2_refcount_rec_merge(rb, index);
1894 }
1895
1896 ret = ocfs2_journal_dirty(handle, ref_leaf_bh);
1897 if (ret)
1898 mlog_errno(ret);
1899
1900out:
1901 brelse(new_bh);
1902 return ret;
1903}
1904
1905static int __ocfs2_increase_refcount(handle_t *handle,
1906 struct ocfs2_caching_info *ci,
1907 struct buffer_head *ref_root_bh,
1908 u64 cpos, u32 len, int merge,
1909 struct ocfs2_alloc_context *meta_ac,
1910 struct ocfs2_cached_dealloc_ctxt *dealloc)
1911{
1912 int ret = 0, index;
1913 struct buffer_head *ref_leaf_bh = NULL;
1914 struct ocfs2_refcount_rec rec;
1915 unsigned int set_len = 0;
1916
1917 mlog(0, "Tree owner %llu, add refcount start %llu, len %u\n",
1918 (unsigned long long)ocfs2_metadata_cache_owner(ci),
1919 (unsigned long long)cpos, len);
1920
1921 while (len) {
1922 ret = ocfs2_get_refcount_rec(ci, ref_root_bh,
1923 cpos, len, &rec, &index,
1924 &ref_leaf_bh);
1925 if (ret) {
1926 mlog_errno(ret);
1927 goto out;
1928 }
1929
1930 set_len = le32_to_cpu(rec.r_clusters);
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942 if (rec.r_refcount && le64_to_cpu(rec.r_cpos) == cpos &&
1943 set_len <= len) {
1944 mlog(0, "increase refcount rec, start %llu, len %u, "
1945 "count %u\n", (unsigned long long)cpos, set_len,
1946 le32_to_cpu(rec.r_refcount));
1947 ret = ocfs2_change_refcount_rec(handle, ci,
1948 ref_leaf_bh, index,
1949 merge, 1);
1950 if (ret) {
1951 mlog_errno(ret);
1952 goto out;
1953 }
1954 } else if (!rec.r_refcount) {
1955 rec.r_refcount = cpu_to_le32(1);
1956
1957 mlog(0, "insert refcount rec, start %llu, len %u\n",
1958 (unsigned long long)le64_to_cpu(rec.r_cpos),
1959 set_len);
1960 ret = ocfs2_insert_refcount_rec(handle, ci, ref_root_bh,
1961 ref_leaf_bh,
1962 &rec, index,
1963 merge, meta_ac);
1964 if (ret) {
1965 mlog_errno(ret);
1966 goto out;
1967 }
1968 } else {
1969 set_len = min((u64)(cpos + len),
1970 le64_to_cpu(rec.r_cpos) + set_len) - cpos;
1971 rec.r_cpos = cpu_to_le64(cpos);
1972 rec.r_clusters = cpu_to_le32(set_len);
1973 le32_add_cpu(&rec.r_refcount, 1);
1974
1975 mlog(0, "split refcount rec, start %llu, "
1976 "len %u, count %u\n",
1977 (unsigned long long)le64_to_cpu(rec.r_cpos),
1978 set_len, le32_to_cpu(rec.r_refcount));
1979 ret = ocfs2_split_refcount_rec(handle, ci,
1980 ref_root_bh, ref_leaf_bh,
1981 &rec, index, merge,
1982 meta_ac, dealloc);
1983 if (ret) {
1984 mlog_errno(ret);
1985 goto out;
1986 }
1987 }
1988
1989 cpos += set_len;
1990 len -= set_len;
1991 brelse(ref_leaf_bh);
1992 ref_leaf_bh = NULL;
1993 }
1994
1995out:
1996 brelse(ref_leaf_bh);
1997 return ret;
1998}
1999
2000static int ocfs2_remove_refcount_extent(handle_t *handle,
2001 struct ocfs2_caching_info *ci,
2002 struct buffer_head *ref_root_bh,
2003 struct buffer_head *ref_leaf_bh,
2004 struct ocfs2_alloc_context *meta_ac,
2005 struct ocfs2_cached_dealloc_ctxt *dealloc)
2006{
2007 int ret;
2008 struct super_block *sb = ocfs2_metadata_cache_get_super(ci);
2009 struct ocfs2_refcount_block *rb =
2010 (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
2011 struct ocfs2_extent_tree et;
2012
2013 BUG_ON(rb->rf_records.rl_used);
2014
2015 ocfs2_init_refcount_extent_tree(&et, ci, ref_root_bh);
2016 ret = ocfs2_remove_extent(handle, &et, le32_to_cpu(rb->rf_cpos),
2017 1, meta_ac, dealloc);
2018 if (ret) {
2019 mlog_errno(ret);
2020 goto out;
2021 }
2022
2023 ocfs2_remove_from_cache(ci, ref_leaf_bh);
2024
2025
2026
2027
2028
2029 ret = ocfs2_cache_block_dealloc(dealloc, EXTENT_ALLOC_SYSTEM_INODE,
2030 le16_to_cpu(rb->rf_suballoc_slot),
2031 le64_to_cpu(rb->rf_blkno),
2032 le16_to_cpu(rb->rf_suballoc_bit));
2033 if (ret) {
2034 mlog_errno(ret);
2035 goto out;
2036 }
2037
2038 ret = ocfs2_journal_access_rb(handle, ci, ref_root_bh,
2039 OCFS2_JOURNAL_ACCESS_WRITE);
2040 if (ret) {
2041 mlog_errno(ret);
2042 goto out;
2043 }
2044
2045 rb = (struct ocfs2_refcount_block *)ref_root_bh->b_data;
2046
2047 le32_add_cpu(&rb->rf_clusters, -1);
2048
2049
2050
2051
2052
2053 if (!rb->rf_list.l_next_free_rec) {
2054 BUG_ON(rb->rf_clusters);
2055
2056 mlog(0, "reset refcount tree root %llu to be a record block.\n",
2057 (unsigned long long)ref_root_bh->b_blocknr);
2058
2059 rb->rf_flags = 0;
2060 rb->rf_parent = 0;
2061 rb->rf_cpos = 0;
2062 memset(&rb->rf_records, 0, sb->s_blocksize -
2063 offsetof(struct ocfs2_refcount_block, rf_records));
2064 rb->rf_records.rl_count =
2065 cpu_to_le16(ocfs2_refcount_recs_per_rb(sb));
2066 }
2067
2068 ocfs2_journal_dirty(handle, ref_root_bh);
2069
2070out:
2071 return ret;
2072}
2073
2074int ocfs2_increase_refcount(handle_t *handle,
2075 struct ocfs2_caching_info *ci,
2076 struct buffer_head *ref_root_bh,
2077 u64 cpos, u32 len,
2078 struct ocfs2_alloc_context *meta_ac,
2079 struct ocfs2_cached_dealloc_ctxt *dealloc)
2080{
2081 return __ocfs2_increase_refcount(handle, ci, ref_root_bh,
2082 cpos, len, 1,
2083 meta_ac, dealloc);
2084}
2085
2086static int ocfs2_decrease_refcount_rec(handle_t *handle,
2087 struct ocfs2_caching_info *ci,
2088 struct buffer_head *ref_root_bh,
2089 struct buffer_head *ref_leaf_bh,
2090 int index, u64 cpos, unsigned int len,
2091 struct ocfs2_alloc_context *meta_ac,
2092 struct ocfs2_cached_dealloc_ctxt *dealloc)
2093{
2094 int ret;
2095 struct ocfs2_refcount_block *rb =
2096 (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
2097 struct ocfs2_refcount_rec *rec = &rb->rf_records.rl_recs[index];
2098
2099 BUG_ON(cpos < le64_to_cpu(rec->r_cpos));
2100 BUG_ON(cpos + len >
2101 le64_to_cpu(rec->r_cpos) + le32_to_cpu(rec->r_clusters));
2102
2103 if (cpos == le64_to_cpu(rec->r_cpos) &&
2104 len == le32_to_cpu(rec->r_clusters))
2105 ret = ocfs2_change_refcount_rec(handle, ci,
2106 ref_leaf_bh, index, 1, -1);
2107 else {
2108 struct ocfs2_refcount_rec split = *rec;
2109 split.r_cpos = cpu_to_le64(cpos);
2110 split.r_clusters = cpu_to_le32(len);
2111
2112 le32_add_cpu(&split.r_refcount, -1);
2113
2114 mlog(0, "split refcount rec, start %llu, "
2115 "len %u, count %u, original start %llu, len %u\n",
2116 (unsigned long long)le64_to_cpu(split.r_cpos),
2117 len, le32_to_cpu(split.r_refcount),
2118 (unsigned long long)le64_to_cpu(rec->r_cpos),
2119 le32_to_cpu(rec->r_clusters));
2120 ret = ocfs2_split_refcount_rec(handle, ci,
2121 ref_root_bh, ref_leaf_bh,
2122 &split, index, 1,
2123 meta_ac, dealloc);
2124 }
2125
2126 if (ret) {
2127 mlog_errno(ret);
2128 goto out;
2129 }
2130
2131
2132 if (!rb->rf_records.rl_used && ref_leaf_bh != ref_root_bh) {
2133 ret = ocfs2_remove_refcount_extent(handle, ci, ref_root_bh,
2134 ref_leaf_bh, meta_ac,
2135 dealloc);
2136 if (ret)
2137 mlog_errno(ret);
2138 }
2139
2140out:
2141 return ret;
2142}
2143
2144static int __ocfs2_decrease_refcount(handle_t *handle,
2145 struct ocfs2_caching_info *ci,
2146 struct buffer_head *ref_root_bh,
2147 u64 cpos, u32 len,
2148 struct ocfs2_alloc_context *meta_ac,
2149 struct ocfs2_cached_dealloc_ctxt *dealloc,
2150 int delete)
2151{
2152 int ret = 0, index = 0;
2153 struct ocfs2_refcount_rec rec;
2154 unsigned int r_count = 0, r_len;
2155 struct super_block *sb = ocfs2_metadata_cache_get_super(ci);
2156 struct buffer_head *ref_leaf_bh = NULL;
2157
2158 mlog(0, "Tree owner %llu, decrease refcount start %llu, "
2159 "len %u, delete %u\n",
2160 (unsigned long long)ocfs2_metadata_cache_owner(ci),
2161 (unsigned long long)cpos, len, delete);
2162
2163 while (len) {
2164 ret = ocfs2_get_refcount_rec(ci, ref_root_bh,
2165 cpos, len, &rec, &index,
2166 &ref_leaf_bh);
2167 if (ret) {
2168 mlog_errno(ret);
2169 goto out;
2170 }
2171
2172 r_count = le32_to_cpu(rec.r_refcount);
2173 BUG_ON(r_count == 0);
2174 if (!delete)
2175 BUG_ON(r_count > 1);
2176
2177 r_len = min((u64)(cpos + len), le64_to_cpu(rec.r_cpos) +
2178 le32_to_cpu(rec.r_clusters)) - cpos;
2179
2180 ret = ocfs2_decrease_refcount_rec(handle, ci, ref_root_bh,
2181 ref_leaf_bh, index,
2182 cpos, r_len,
2183 meta_ac, dealloc);
2184 if (ret) {
2185 mlog_errno(ret);
2186 goto out;
2187 }
2188
2189 if (le32_to_cpu(rec.r_refcount) == 1 && delete) {
2190 ret = ocfs2_cache_cluster_dealloc(dealloc,
2191 ocfs2_clusters_to_blocks(sb, cpos),
2192 r_len);
2193 if (ret) {
2194 mlog_errno(ret);
2195 goto out;
2196 }
2197 }
2198
2199 cpos += r_len;
2200 len -= r_len;
2201 brelse(ref_leaf_bh);
2202 ref_leaf_bh = NULL;
2203 }
2204
2205out:
2206 brelse(ref_leaf_bh);
2207 return ret;
2208}
2209
2210
2211int ocfs2_decrease_refcount(struct inode *inode,
2212 handle_t *handle, u32 cpos, u32 len,
2213 struct ocfs2_alloc_context *meta_ac,
2214 struct ocfs2_cached_dealloc_ctxt *dealloc,
2215 int delete)
2216{
2217 int ret;
2218 u64 ref_blkno;
2219 struct ocfs2_inode_info *oi = OCFS2_I(inode);
2220 struct buffer_head *ref_root_bh = NULL;
2221 struct ocfs2_refcount_tree *tree;
2222
2223 BUG_ON(!(oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL));
2224
2225 ret = ocfs2_get_refcount_block(inode, &ref_blkno);
2226 if (ret) {
2227 mlog_errno(ret);
2228 goto out;
2229 }
2230
2231 ret = ocfs2_get_refcount_tree(OCFS2_SB(inode->i_sb), ref_blkno, &tree);
2232 if (ret) {
2233 mlog_errno(ret);
2234 goto out;
2235 }
2236
2237 ret = ocfs2_read_refcount_block(&tree->rf_ci, tree->rf_blkno,
2238 &ref_root_bh);
2239 if (ret) {
2240 mlog_errno(ret);
2241 goto out;
2242 }
2243
2244 ret = __ocfs2_decrease_refcount(handle, &tree->rf_ci, ref_root_bh,
2245 cpos, len, meta_ac, dealloc, delete);
2246 if (ret)
2247 mlog_errno(ret);
2248out:
2249 brelse(ref_root_bh);
2250 return ret;
2251}
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262static int ocfs2_mark_extent_refcounted(struct inode *inode,
2263 struct ocfs2_extent_tree *et,
2264 handle_t *handle, u32 cpos,
2265 u32 len, u32 phys,
2266 struct ocfs2_alloc_context *meta_ac,
2267 struct ocfs2_cached_dealloc_ctxt *dealloc)
2268{
2269 int ret;
2270
2271 mlog(0, "Inode %lu refcount tree cpos %u, len %u, phys cluster %u\n",
2272 inode->i_ino, cpos, len, phys);
2273
2274 if (!ocfs2_refcount_tree(OCFS2_SB(inode->i_sb))) {
2275 ocfs2_error(inode->i_sb, "Inode %lu want to use refcount "
2276 "tree, but the feature bit is not set in the "
2277 "super block.", inode->i_ino);
2278 ret = -EROFS;
2279 goto out;
2280 }
2281
2282 ret = ocfs2_change_extent_flag(handle, et, cpos,
2283 len, phys, meta_ac, dealloc,
2284 OCFS2_EXT_REFCOUNTED, 0);
2285 if (ret)
2286 mlog_errno(ret);
2287
2288out:
2289 return ret;
2290}
2291
2292
2293
2294
2295
2296static int ocfs2_calc_refcount_meta_credits(struct super_block *sb,
2297 struct ocfs2_caching_info *ci,
2298 struct buffer_head *ref_root_bh,
2299 u64 start_cpos,
2300 u32 clusters,
2301 int *meta_add,
2302 int *credits)
2303{
2304 int ret = 0, index, ref_blocks = 0, recs_add = 0;
2305 u64 cpos = start_cpos;
2306 struct ocfs2_refcount_block *rb;
2307 struct ocfs2_refcount_rec rec;
2308 struct buffer_head *ref_leaf_bh = NULL, *prev_bh = NULL;
2309 u32 len;
2310
2311 mlog(0, "start_cpos %llu, clusters %u\n",
2312 (unsigned long long)start_cpos, clusters);
2313 while (clusters) {
2314 ret = ocfs2_get_refcount_rec(ci, ref_root_bh,
2315 cpos, clusters, &rec,
2316 &index, &ref_leaf_bh);
2317 if (ret) {
2318 mlog_errno(ret);
2319 goto out;
2320 }
2321
2322 if (ref_leaf_bh != prev_bh) {
2323
2324
2325
2326
2327 if (prev_bh) {
2328 rb = (struct ocfs2_refcount_block *)
2329 prev_bh->b_data;
2330
2331 if (le64_to_cpu(rb->rf_records.rl_used) +
2332 recs_add >
2333 le16_to_cpu(rb->rf_records.rl_count))
2334 ref_blocks++;
2335 }
2336
2337 recs_add = 0;
2338 *credits += 1;
2339 brelse(prev_bh);
2340 prev_bh = ref_leaf_bh;
2341 get_bh(prev_bh);
2342 }
2343
2344 rb = (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
2345
2346 mlog(0, "recs_add %d,cpos %llu, clusters %u, rec->r_cpos %llu,"
2347 "rec->r_clusters %u, rec->r_refcount %u, index %d\n",
2348 recs_add, (unsigned long long)cpos, clusters,
2349 (unsigned long long)le64_to_cpu(rec.r_cpos),
2350 le32_to_cpu(rec.r_clusters),
2351 le32_to_cpu(rec.r_refcount), index);
2352
2353 len = min((u64)cpos + clusters, le64_to_cpu(rec.r_cpos) +
2354 le32_to_cpu(rec.r_clusters)) - cpos;
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365 if (rec.r_refcount) {
2366
2367 if (cpos == start_cpos &&
2368 cpos != le64_to_cpu(rec.r_cpos))
2369 recs_add++;
2370
2371
2372 if (cpos + clusters < le64_to_cpu(rec.r_cpos) +
2373 le32_to_cpu(rec.r_clusters))
2374 recs_add++;
2375 } else
2376 recs_add++;
2377
2378 brelse(ref_leaf_bh);
2379 ref_leaf_bh = NULL;
2380 clusters -= len;
2381 cpos += len;
2382 }
2383
2384 if (prev_bh) {
2385 rb = (struct ocfs2_refcount_block *)prev_bh->b_data;
2386
2387 if (le64_to_cpu(rb->rf_records.rl_used) + recs_add >
2388 le16_to_cpu(rb->rf_records.rl_count))
2389 ref_blocks++;
2390
2391 *credits += 1;
2392 }
2393
2394 if (!ref_blocks)
2395 goto out;
2396
2397 mlog(0, "we need ref_blocks %d\n", ref_blocks);
2398 *meta_add += ref_blocks;
2399 *credits += ref_blocks;
2400
2401
2402
2403
2404
2405
2406
2407
2408 rb = (struct ocfs2_refcount_block *)ref_root_bh->b_data;
2409 if (le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL) {
2410 struct ocfs2_extent_tree et;
2411
2412 ocfs2_init_refcount_extent_tree(&et, ci, ref_root_bh);
2413 *meta_add += ocfs2_extend_meta_needed(et.et_root_el);
2414 *credits += ocfs2_calc_extend_credits(sb,
2415 et.et_root_el,
2416 ref_blocks);
2417 } else {
2418 *credits += OCFS2_EXPAND_REFCOUNT_TREE_CREDITS;
2419 *meta_add += 1;
2420 }
2421
2422out:
2423 brelse(ref_leaf_bh);
2424 brelse(prev_bh);
2425 return ret;
2426}
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440int ocfs2_prepare_refcount_change_for_del(struct inode *inode,
2441 struct buffer_head *di_bh,
2442 u64 phys_blkno,
2443 u32 clusters,
2444 int *credits,
2445 struct ocfs2_alloc_context **meta_ac)
2446{
2447 int ret, ref_blocks = 0;
2448 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
2449 struct ocfs2_inode_info *oi = OCFS2_I(inode);
2450 struct buffer_head *ref_root_bh = NULL;
2451 struct ocfs2_refcount_tree *tree;
2452 u64 start_cpos = ocfs2_blocks_to_clusters(inode->i_sb, phys_blkno);
2453
2454 if (!ocfs2_refcount_tree(OCFS2_SB(inode->i_sb))) {
2455 ocfs2_error(inode->i_sb, "Inode %lu want to use refcount "
2456 "tree, but the feature bit is not set in the "
2457 "super block.", inode->i_ino);
2458 ret = -EROFS;
2459 goto out;
2460 }
2461
2462 BUG_ON(!(oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL));
2463
2464 ret = ocfs2_get_refcount_tree(OCFS2_SB(inode->i_sb),
2465 le64_to_cpu(di->i_refcount_loc), &tree);
2466 if (ret) {
2467 mlog_errno(ret);
2468 goto out;
2469 }
2470
2471 ret = ocfs2_read_refcount_block(&tree->rf_ci,
2472 le64_to_cpu(di->i_refcount_loc),
2473 &ref_root_bh);
2474 if (ret) {
2475 mlog_errno(ret);
2476 goto out;
2477 }
2478
2479 ret = ocfs2_calc_refcount_meta_credits(inode->i_sb,
2480 &tree->rf_ci,
2481 ref_root_bh,
2482 start_cpos, clusters,
2483 &ref_blocks, credits);
2484 if (ret) {
2485 mlog_errno(ret);
2486 goto out;
2487 }
2488
2489 mlog(0, "reserve new metadata %d, credits = %d\n",
2490 ref_blocks, *credits);
2491
2492 if (ref_blocks) {
2493 ret = ocfs2_reserve_new_metadata_blocks(OCFS2_SB(inode->i_sb),
2494 ref_blocks, meta_ac);
2495 if (ret)
2496 mlog_errno(ret);
2497 }
2498
2499out:
2500 brelse(ref_root_bh);
2501 return ret;
2502}
2503
2504#define MAX_CONTIG_BYTES 1048576
2505
2506static inline unsigned int ocfs2_cow_contig_clusters(struct super_block *sb)
2507{
2508 return ocfs2_clusters_for_bytes(sb, MAX_CONTIG_BYTES);
2509}
2510
2511static inline unsigned int ocfs2_cow_contig_mask(struct super_block *sb)
2512{
2513 return ~(ocfs2_cow_contig_clusters(sb) - 1);
2514}
2515
2516
2517
2518
2519
2520
2521
2522
2523static inline unsigned int ocfs2_cow_align_start(struct super_block *sb,
2524 unsigned int start,
2525 unsigned int cpos)
2526{
2527 BUG_ON(start > cpos);
2528
2529 return start + ((cpos - start) & ocfs2_cow_contig_mask(sb));
2530}
2531
2532
2533
2534
2535
2536static inline unsigned int ocfs2_cow_align_length(struct super_block *sb,
2537 unsigned int len)
2538{
2539 unsigned int padded =
2540 (len + (ocfs2_cow_contig_clusters(sb) - 1)) &
2541 ocfs2_cow_contig_mask(sb);
2542
2543
2544 if (padded < len)
2545 padded = UINT_MAX;
2546
2547 return padded;
2548}
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561static int ocfs2_refcount_cal_cow_clusters(struct inode *inode,
2562 struct ocfs2_extent_list *el,
2563 u32 cpos,
2564 u32 write_len,
2565 u32 max_cpos,
2566 u32 *cow_start,
2567 u32 *cow_len)
2568{
2569 int ret = 0;
2570 int tree_height = le16_to_cpu(el->l_tree_depth), i;
2571 struct buffer_head *eb_bh = NULL;
2572 struct ocfs2_extent_block *eb = NULL;
2573 struct ocfs2_extent_rec *rec;
2574 unsigned int want_clusters, rec_end = 0;
2575 int contig_clusters = ocfs2_cow_contig_clusters(inode->i_sb);
2576 int leaf_clusters;
2577
2578 BUG_ON(cpos + write_len > max_cpos);
2579
2580 if (tree_height > 0) {
2581 ret = ocfs2_find_leaf(INODE_CACHE(inode), el, cpos, &eb_bh);
2582 if (ret) {
2583 mlog_errno(ret);
2584 goto out;
2585 }
2586
2587 eb = (struct ocfs2_extent_block *) eb_bh->b_data;
2588 el = &eb->h_list;
2589
2590 if (el->l_tree_depth) {
2591 ocfs2_error(inode->i_sb,
2592 "Inode %lu has non zero tree depth in "
2593 "leaf block %llu\n", inode->i_ino,
2594 (unsigned long long)eb_bh->b_blocknr);
2595 ret = -EROFS;
2596 goto out;
2597 }
2598 }
2599
2600 *cow_len = 0;
2601 for (i = 0; i < le16_to_cpu(el->l_next_free_rec); i++) {
2602 rec = &el->l_recs[i];
2603
2604 if (ocfs2_is_empty_extent(rec)) {
2605 mlog_bug_on_msg(i != 0, "Inode %lu has empty record in "
2606 "index %d\n", inode->i_ino, i);
2607 continue;
2608 }
2609
2610 if (le32_to_cpu(rec->e_cpos) +
2611 le16_to_cpu(rec->e_leaf_clusters) <= cpos)
2612 continue;
2613
2614 if (*cow_len == 0) {
2615
2616
2617
2618
2619 BUG_ON(!(rec->e_flags & OCFS2_EXT_REFCOUNTED));
2620 *cow_start = le32_to_cpu(rec->e_cpos);
2621 }
2622
2623
2624
2625
2626
2627 if ((!(rec->e_flags & OCFS2_EXT_REFCOUNTED)) ||
2628 (*cow_len && rec_end != le32_to_cpu(rec->e_cpos)) ||
2629 (max_cpos <= le32_to_cpu(rec->e_cpos)))
2630 break;
2631
2632 leaf_clusters = le16_to_cpu(rec->e_leaf_clusters);
2633 rec_end = le32_to_cpu(rec->e_cpos) + leaf_clusters;
2634 if (rec_end > max_cpos) {
2635 rec_end = max_cpos;
2636 leaf_clusters = rec_end - le32_to_cpu(rec->e_cpos);
2637 }
2638
2639
2640
2641
2642
2643
2644
2645 if (!*cow_len)
2646 want_clusters = write_len;
2647 else
2648 want_clusters = (cpos + write_len) -
2649 (*cow_start + *cow_len);
2650 if (want_clusters < contig_clusters)
2651 want_clusters = contig_clusters;
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661 if (leaf_clusters <= contig_clusters)
2662 *cow_len += leaf_clusters;
2663 else if (*cow_len || (*cow_start == cpos)) {
2664
2665
2666
2667
2668
2669
2670
2671 want_clusters = ocfs2_cow_align_length(inode->i_sb,
2672 want_clusters);
2673
2674 if (leaf_clusters < want_clusters)
2675 *cow_len += leaf_clusters;
2676 else
2677 *cow_len += want_clusters;
2678 } else if ((*cow_start + contig_clusters) >=
2679 (cpos + write_len)) {
2680
2681
2682
2683
2684
2685 *cow_len = contig_clusters;
2686 } else if ((rec_end - cpos) <= contig_clusters) {
2687
2688
2689
2690
2691 *cow_start = rec_end - contig_clusters;
2692 *cow_len = contig_clusters;
2693 } else if ((rec_end - cpos) <= want_clusters) {
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704 *cow_start = ocfs2_cow_align_start(inode->i_sb,
2705 *cow_start, cpos);
2706 *cow_len = rec_end - *cow_start;
2707 } else {
2708
2709
2710
2711
2712
2713
2714
2715
2716 *cow_start = ocfs2_cow_align_start(inode->i_sb,
2717 *cow_start, cpos);
2718
2719 want_clusters = (cpos + write_len) - *cow_start;
2720 want_clusters = ocfs2_cow_align_length(inode->i_sb,
2721 want_clusters);
2722 if (*cow_start + want_clusters <= rec_end)
2723 *cow_len = want_clusters;
2724 else
2725 *cow_len = rec_end - *cow_start;
2726 }
2727
2728
2729 if ((*cow_start + *cow_len) >= (cpos + write_len))
2730 break;
2731
2732
2733
2734
2735
2736 if (i + 1 == le16_to_cpu(el->l_next_free_rec) &&
2737 eb && eb->h_next_leaf_blk) {
2738 brelse(eb_bh);
2739 eb_bh = NULL;
2740
2741 ret = ocfs2_read_extent_block(INODE_CACHE(inode),
2742 le64_to_cpu(eb->h_next_leaf_blk),
2743 &eb_bh);
2744 if (ret) {
2745 mlog_errno(ret);
2746 goto out;
2747 }
2748
2749 eb = (struct ocfs2_extent_block *) eb_bh->b_data;
2750 el = &eb->h_list;
2751 i = -1;
2752 }
2753 }
2754
2755out:
2756 brelse(eb_bh);
2757 return ret;
2758}
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771static int ocfs2_lock_refcount_allocators(struct super_block *sb,
2772 u32 p_cluster, u32 num_clusters,
2773 struct ocfs2_extent_tree *et,
2774 struct ocfs2_caching_info *ref_ci,
2775 struct buffer_head *ref_root_bh,
2776 struct ocfs2_alloc_context **meta_ac,
2777 struct ocfs2_alloc_context **data_ac,
2778 int *credits)
2779{
2780 int ret = 0, meta_add = 0;
2781 int num_free_extents = ocfs2_num_free_extents(OCFS2_SB(sb), et);
2782
2783 if (num_free_extents < 0) {
2784 ret = num_free_extents;
2785 mlog_errno(ret);
2786 goto out;
2787 }
2788
2789 if (num_free_extents < num_clusters + 2)
2790 meta_add =
2791 ocfs2_extend_meta_needed(et->et_root_el);
2792
2793 *credits += ocfs2_calc_extend_credits(sb, et->et_root_el,
2794 num_clusters + 2);
2795
2796 ret = ocfs2_calc_refcount_meta_credits(sb, ref_ci, ref_root_bh,
2797 p_cluster, num_clusters,
2798 &meta_add, credits);
2799 if (ret) {
2800 mlog_errno(ret);
2801 goto out;
2802 }
2803
2804 mlog(0, "reserve new metadata %d, clusters %u, credits = %d\n",
2805 meta_add, num_clusters, *credits);
2806 ret = ocfs2_reserve_new_metadata_blocks(OCFS2_SB(sb), meta_add,
2807 meta_ac);
2808 if (ret) {
2809 mlog_errno(ret);
2810 goto out;
2811 }
2812
2813 if (data_ac) {
2814 ret = ocfs2_reserve_clusters(OCFS2_SB(sb), num_clusters,
2815 data_ac);
2816 if (ret)
2817 mlog_errno(ret);
2818 }
2819
2820out:
2821 if (ret) {
2822 if (*meta_ac) {
2823 ocfs2_free_alloc_context(*meta_ac);
2824 *meta_ac = NULL;
2825 }
2826 }
2827
2828 return ret;
2829}
2830
2831static int ocfs2_clear_cow_buffer(handle_t *handle, struct buffer_head *bh)
2832{
2833 BUG_ON(buffer_dirty(bh));
2834
2835 clear_buffer_mapped(bh);
2836
2837 return 0;
2838}
2839
2840static int ocfs2_duplicate_clusters_by_page(handle_t *handle,
2841 struct ocfs2_cow_context *context,
2842 u32 cpos, u32 old_cluster,
2843 u32 new_cluster, u32 new_len)
2844{
2845 int ret = 0, partial;
2846 struct ocfs2_caching_info *ci = context->data_et.et_ci;
2847 struct super_block *sb = ocfs2_metadata_cache_get_super(ci);
2848 u64 new_block = ocfs2_clusters_to_blocks(sb, new_cluster);
2849 struct page *page;
2850 pgoff_t page_index;
2851 unsigned int from, to;
2852 loff_t offset, end, map_end;
2853 struct address_space *mapping = context->inode->i_mapping;
2854
2855 mlog(0, "old_cluster %u, new %u, len %u at offset %u\n", old_cluster,
2856 new_cluster, new_len, cpos);
2857
2858 offset = ((loff_t)cpos) << OCFS2_SB(sb)->s_clustersize_bits;
2859 end = offset + (new_len << OCFS2_SB(sb)->s_clustersize_bits);
2860
2861 while (offset < end) {
2862 page_index = offset >> PAGE_CACHE_SHIFT;
2863 map_end = (page_index + 1) << PAGE_CACHE_SHIFT;
2864 if (map_end > end)
2865 map_end = end;
2866
2867
2868 from = offset & (PAGE_CACHE_SIZE - 1);
2869 to = PAGE_CACHE_SIZE;
2870 if (map_end & (PAGE_CACHE_SIZE - 1))
2871 to = map_end & (PAGE_CACHE_SIZE - 1);
2872
2873 page = grab_cache_page(mapping, page_index);
2874
2875
2876 BUG_ON(PageDirty(page));
2877
2878 if (!PageUptodate(page)) {
2879 ret = block_read_full_page(page, ocfs2_get_block);
2880 if (ret) {
2881 mlog_errno(ret);
2882 goto unlock;
2883 }
2884 lock_page(page);
2885 }
2886
2887 if (page_has_buffers(page)) {
2888 ret = walk_page_buffers(handle, page_buffers(page),
2889 from, to, &partial,
2890 ocfs2_clear_cow_buffer);
2891 if (ret) {
2892 mlog_errno(ret);
2893 goto unlock;
2894 }
2895 }
2896
2897 ocfs2_map_and_dirty_page(context->inode,
2898 handle, from, to,
2899 page, 0, &new_block);
2900 mark_page_accessed(page);
2901unlock:
2902 unlock_page(page);
2903 page_cache_release(page);
2904 page = NULL;
2905 offset = map_end;
2906 if (ret)
2907 break;
2908 }
2909
2910 return ret;
2911}
2912
2913static int ocfs2_duplicate_clusters_by_jbd(handle_t *handle,
2914 struct ocfs2_cow_context *context,
2915 u32 cpos, u32 old_cluster,
2916 u32 new_cluster, u32 new_len)
2917{
2918 int ret = 0;
2919 struct super_block *sb = context->inode->i_sb;
2920 struct ocfs2_caching_info *ci = context->data_et.et_ci;
2921 int i, blocks = ocfs2_clusters_to_blocks(sb, new_len);
2922 u64 old_block = ocfs2_clusters_to_blocks(sb, old_cluster);
2923 u64 new_block = ocfs2_clusters_to_blocks(sb, new_cluster);
2924 struct ocfs2_super *osb = OCFS2_SB(sb);
2925 struct buffer_head *old_bh = NULL;
2926 struct buffer_head *new_bh = NULL;
2927
2928 mlog(0, "old_cluster %u, new %u, len %u\n", old_cluster,
2929 new_cluster, new_len);
2930
2931 for (i = 0; i < blocks; i++, old_block++, new_block++) {
2932 new_bh = sb_getblk(osb->sb, new_block);
2933 if (new_bh == NULL) {
2934 ret = -EIO;
2935 mlog_errno(ret);
2936 break;
2937 }
2938
2939 ocfs2_set_new_buffer_uptodate(ci, new_bh);
2940
2941 ret = ocfs2_read_block(ci, old_block, &old_bh, NULL);
2942 if (ret) {
2943 mlog_errno(ret);
2944 break;
2945 }
2946
2947 ret = ocfs2_journal_access(handle, ci, new_bh,
2948 OCFS2_JOURNAL_ACCESS_CREATE);
2949 if (ret) {
2950 mlog_errno(ret);
2951 break;
2952 }
2953
2954 memcpy(new_bh->b_data, old_bh->b_data, sb->s_blocksize);
2955 ret = ocfs2_journal_dirty(handle, new_bh);
2956 if (ret) {
2957 mlog_errno(ret);
2958 break;
2959 }
2960
2961 brelse(new_bh);
2962 brelse(old_bh);
2963 new_bh = NULL;
2964 old_bh = NULL;
2965 }
2966
2967 brelse(new_bh);
2968 brelse(old_bh);
2969 return ret;
2970}
2971
2972static int ocfs2_clear_ext_refcount(handle_t *handle,
2973 struct ocfs2_extent_tree *et,
2974 u32 cpos, u32 p_cluster, u32 len,
2975 unsigned int ext_flags,
2976 struct ocfs2_alloc_context *meta_ac,
2977 struct ocfs2_cached_dealloc_ctxt *dealloc)
2978{
2979 int ret, index;
2980 struct ocfs2_extent_rec replace_rec;
2981 struct ocfs2_path *path = NULL;
2982 struct ocfs2_extent_list *el;
2983 struct super_block *sb = ocfs2_metadata_cache_get_super(et->et_ci);
2984 u64 ino = ocfs2_metadata_cache_owner(et->et_ci);
2985
2986 mlog(0, "inode %llu cpos %u, len %u, p_cluster %u, ext_flags %u\n",
2987 (unsigned long long)ino, cpos, len, p_cluster, ext_flags);
2988
2989 memset(&replace_rec, 0, sizeof(replace_rec));
2990 replace_rec.e_cpos = cpu_to_le32(cpos);
2991 replace_rec.e_leaf_clusters = cpu_to_le16(len);
2992 replace_rec.e_blkno = cpu_to_le64(ocfs2_clusters_to_blocks(sb,
2993 p_cluster));
2994 replace_rec.e_flags = ext_flags;
2995 replace_rec.e_flags &= ~OCFS2_EXT_REFCOUNTED;
2996
2997 path = ocfs2_new_path_from_et(et);
2998 if (!path) {
2999 ret = -ENOMEM;
3000 mlog_errno(ret);
3001 goto out;
3002 }
3003
3004 ret = ocfs2_find_path(et->et_ci, path, cpos);
3005 if (ret) {
3006 mlog_errno(ret);
3007 goto out;
3008 }
3009
3010 el = path_leaf_el(path);
3011
3012 index = ocfs2_search_extent_list(el, cpos);
3013 if (index == -1 || index >= le16_to_cpu(el->l_next_free_rec)) {
3014 ocfs2_error(sb,
3015 "Inode %llu has an extent at cpos %u which can no "
3016 "longer be found.\n",
3017 (unsigned long long)ino, cpos);
3018 ret = -EROFS;
3019 goto out;
3020 }
3021
3022 ret = ocfs2_split_extent(handle, et, path, index,
3023 &replace_rec, meta_ac, dealloc);
3024 if (ret)
3025 mlog_errno(ret);
3026
3027out:
3028 ocfs2_free_path(path);
3029 return ret;
3030}
3031
3032static int ocfs2_replace_clusters(handle_t *handle,
3033 struct ocfs2_cow_context *context,
3034 u32 cpos, u32 old,
3035 u32 new, u32 len,
3036 unsigned int ext_flags)
3037{
3038 int ret;
3039 struct ocfs2_caching_info *ci = context->data_et.et_ci;
3040 u64 ino = ocfs2_metadata_cache_owner(ci);
3041
3042 mlog(0, "inode %llu, cpos %u, old %u, new %u, len %u, ext_flags %u\n",
3043 (unsigned long long)ino, cpos, old, new, len, ext_flags);
3044
3045
3046 if (!(ext_flags & OCFS2_EXT_UNWRITTEN)) {
3047 ret = context->cow_duplicate_clusters(handle, context, cpos,
3048 old, new, len);
3049 if (ret) {
3050 mlog_errno(ret);
3051 goto out;
3052 }
3053 }
3054
3055 ret = ocfs2_clear_ext_refcount(handle, &context->data_et,
3056 cpos, new, len, ext_flags,
3057 context->meta_ac, &context->dealloc);
3058 if (ret)
3059 mlog_errno(ret);
3060out:
3061 return ret;
3062}
3063
3064static int ocfs2_cow_sync_writeback(struct super_block *sb,
3065 struct ocfs2_cow_context *context,
3066 u32 cpos, u32 num_clusters)
3067{
3068 int ret = 0;
3069 loff_t offset, end, map_end;
3070 pgoff_t page_index;
3071 struct page *page;
3072
3073 if (ocfs2_should_order_data(context->inode))
3074 return 0;
3075
3076 offset = ((loff_t)cpos) << OCFS2_SB(sb)->s_clustersize_bits;
3077 end = offset + (num_clusters << OCFS2_SB(sb)->s_clustersize_bits);
3078
3079 ret = filemap_fdatawrite_range(context->inode->i_mapping,
3080 offset, end - 1);
3081 if (ret < 0) {
3082 mlog_errno(ret);
3083 return ret;
3084 }
3085
3086 while (offset < end) {
3087 page_index = offset >> PAGE_CACHE_SHIFT;
3088 map_end = (page_index + 1) << PAGE_CACHE_SHIFT;
3089 if (map_end > end)
3090 map_end = end;
3091
3092 page = grab_cache_page(context->inode->i_mapping, page_index);
3093 BUG_ON(!page);
3094
3095 wait_on_page_writeback(page);
3096 if (PageError(page)) {
3097 ret = -EIO;
3098 mlog_errno(ret);
3099 } else
3100 mark_page_accessed(page);
3101
3102 unlock_page(page);
3103 page_cache_release(page);
3104 page = NULL;
3105 offset = map_end;
3106 if (ret)
3107 break;
3108 }
3109
3110 return ret;
3111}
3112
3113static int ocfs2_di_get_clusters(struct ocfs2_cow_context *context,
3114 u32 v_cluster, u32 *p_cluster,
3115 u32 *num_clusters,
3116 unsigned int *extent_flags)
3117{
3118 return ocfs2_get_clusters(context->inode, v_cluster, p_cluster,
3119 num_clusters, extent_flags);
3120}
3121
3122static int ocfs2_make_clusters_writable(struct super_block *sb,
3123 struct ocfs2_cow_context *context,
3124 u32 cpos, u32 p_cluster,
3125 u32 num_clusters, unsigned int e_flags)
3126{
3127 int ret, delete, index, credits = 0;
3128 u32 new_bit, new_len;
3129 unsigned int set_len;
3130 struct ocfs2_super *osb = OCFS2_SB(sb);
3131 handle_t *handle;
3132 struct buffer_head *ref_leaf_bh = NULL;
3133 struct ocfs2_caching_info *ref_ci = &context->ref_tree->rf_ci;
3134 struct ocfs2_refcount_rec rec;
3135
3136 mlog(0, "cpos %u, p_cluster %u, num_clusters %u, e_flags %u\n",
3137 cpos, p_cluster, num_clusters, e_flags);
3138
3139 ret = ocfs2_lock_refcount_allocators(sb, p_cluster, num_clusters,
3140 &context->data_et,
3141 ref_ci,
3142 context->ref_root_bh,
3143 &context->meta_ac,
3144 &context->data_ac, &credits);
3145 if (ret) {
3146 mlog_errno(ret);
3147 return ret;
3148 }
3149
3150 if (context->post_refcount)
3151 credits += context->post_refcount->credits;
3152
3153 credits += context->extra_credits;
3154 handle = ocfs2_start_trans(osb, credits);
3155 if (IS_ERR(handle)) {
3156 ret = PTR_ERR(handle);
3157 mlog_errno(ret);
3158 goto out;
3159 }
3160
3161 while (num_clusters) {
3162 ret = ocfs2_get_refcount_rec(ref_ci, context->ref_root_bh,
3163 p_cluster, num_clusters,
3164 &rec, &index, &ref_leaf_bh);
3165 if (ret) {
3166 mlog_errno(ret);
3167 goto out_commit;
3168 }
3169
3170 BUG_ON(!rec.r_refcount);
3171 set_len = min((u64)p_cluster + num_clusters,
3172 le64_to_cpu(rec.r_cpos) +
3173 le32_to_cpu(rec.r_clusters)) - p_cluster;
3174
3175
3176
3177
3178
3179
3180
3181
3182 if (le32_to_cpu(rec.r_refcount) == 1) {
3183 delete = 0;
3184 ret = ocfs2_clear_ext_refcount(handle,
3185 &context->data_et,
3186 cpos, p_cluster,
3187 set_len, e_flags,
3188 context->meta_ac,
3189 &context->dealloc);
3190 if (ret) {
3191 mlog_errno(ret);
3192 goto out_commit;
3193 }
3194 } else {
3195 delete = 1;
3196
3197 ret = __ocfs2_claim_clusters(osb, handle,
3198 context->data_ac,
3199 1, set_len,
3200 &new_bit, &new_len);
3201 if (ret) {
3202 mlog_errno(ret);
3203 goto out_commit;
3204 }
3205
3206 ret = ocfs2_replace_clusters(handle, context,
3207 cpos, p_cluster, new_bit,
3208 new_len, e_flags);
3209 if (ret) {
3210 mlog_errno(ret);
3211 goto out_commit;
3212 }
3213 set_len = new_len;
3214 }
3215
3216 ret = __ocfs2_decrease_refcount(handle, ref_ci,
3217 context->ref_root_bh,
3218 p_cluster, set_len,
3219 context->meta_ac,
3220 &context->dealloc, delete);
3221 if (ret) {
3222 mlog_errno(ret);
3223 goto out_commit;
3224 }
3225
3226 cpos += set_len;
3227 p_cluster += set_len;
3228 num_clusters -= set_len;
3229 brelse(ref_leaf_bh);
3230 ref_leaf_bh = NULL;
3231 }
3232
3233
3234 if (context->post_refcount && context->post_refcount->func) {
3235 ret = context->post_refcount->func(context->inode, handle,
3236 context->post_refcount->para);
3237 if (ret) {
3238 mlog_errno(ret);
3239 goto out_commit;
3240 }
3241 }
3242
3243
3244
3245
3246
3247 if (context->get_clusters == ocfs2_di_get_clusters) {
3248 ret = ocfs2_cow_sync_writeback(sb, context, cpos, num_clusters);
3249 if (ret)
3250 mlog_errno(ret);
3251 }
3252
3253out_commit:
3254 ocfs2_commit_trans(osb, handle);
3255
3256out:
3257 if (context->data_ac) {
3258 ocfs2_free_alloc_context(context->data_ac);
3259 context->data_ac = NULL;
3260 }
3261 if (context->meta_ac) {
3262 ocfs2_free_alloc_context(context->meta_ac);
3263 context->meta_ac = NULL;
3264 }
3265 brelse(ref_leaf_bh);
3266
3267 return ret;
3268}
3269
3270static int ocfs2_replace_cow(struct ocfs2_cow_context *context)
3271{
3272 int ret = 0;
3273 struct inode *inode = context->inode;
3274 u32 cow_start = context->cow_start, cow_len = context->cow_len;
3275 u32 p_cluster, num_clusters;
3276 unsigned int ext_flags;
3277 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3278
3279 if (!ocfs2_refcount_tree(OCFS2_SB(inode->i_sb))) {
3280 ocfs2_error(inode->i_sb, "Inode %lu want to use refcount "
3281 "tree, but the feature bit is not set in the "
3282 "super block.", inode->i_ino);
3283 return -EROFS;
3284 }
3285
3286 ocfs2_init_dealloc_ctxt(&context->dealloc);
3287
3288 while (cow_len) {
3289 ret = context->get_clusters(context, cow_start, &p_cluster,
3290 &num_clusters, &ext_flags);
3291 if (ret) {
3292 mlog_errno(ret);
3293 break;
3294 }
3295
3296 BUG_ON(!(ext_flags & OCFS2_EXT_REFCOUNTED));
3297
3298 if (cow_len < num_clusters)
3299 num_clusters = cow_len;
3300
3301 ret = ocfs2_make_clusters_writable(inode->i_sb, context,
3302 cow_start, p_cluster,
3303 num_clusters, ext_flags);
3304 if (ret) {
3305 mlog_errno(ret);
3306 break;
3307 }
3308
3309 cow_len -= num_clusters;
3310 cow_start += num_clusters;
3311 }
3312
3313 if (ocfs2_dealloc_has_cluster(&context->dealloc)) {
3314 ocfs2_schedule_truncate_log_flush(osb, 1);
3315 ocfs2_run_deallocs(osb, &context->dealloc);
3316 }
3317
3318 return ret;
3319}
3320
3321
3322
3323
3324
3325
3326static int ocfs2_refcount_cow_hunk(struct inode *inode,
3327 struct buffer_head *di_bh,
3328 u32 cpos, u32 write_len, u32 max_cpos)
3329{
3330 int ret;
3331 u32 cow_start = 0, cow_len = 0;
3332 struct ocfs2_inode_info *oi = OCFS2_I(inode);
3333 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3334 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
3335 struct buffer_head *ref_root_bh = NULL;
3336 struct ocfs2_refcount_tree *ref_tree;
3337 struct ocfs2_cow_context *context = NULL;
3338
3339 BUG_ON(!(oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL));
3340
3341 ret = ocfs2_refcount_cal_cow_clusters(inode, &di->id2.i_list,
3342 cpos, write_len, max_cpos,
3343 &cow_start, &cow_len);
3344 if (ret) {
3345 mlog_errno(ret);
3346 goto out;
3347 }
3348
3349 mlog(0, "CoW inode %lu, cpos %u, write_len %u, cow_start %u, "
3350 "cow_len %u\n", inode->i_ino,
3351 cpos, write_len, cow_start, cow_len);
3352
3353 BUG_ON(cow_len == 0);
3354
3355 context = kzalloc(sizeof(struct ocfs2_cow_context), GFP_NOFS);
3356 if (!context) {
3357 ret = -ENOMEM;
3358 mlog_errno(ret);
3359 goto out;
3360 }
3361
3362 ret = ocfs2_lock_refcount_tree(osb, le64_to_cpu(di->i_refcount_loc),
3363 1, &ref_tree, &ref_root_bh);
3364 if (ret) {
3365 mlog_errno(ret);
3366 goto out;
3367 }
3368
3369 context->inode = inode;
3370 context->cow_start = cow_start;
3371 context->cow_len = cow_len;
3372 context->ref_tree = ref_tree;
3373 context->ref_root_bh = ref_root_bh;
3374 context->cow_duplicate_clusters = ocfs2_duplicate_clusters_by_page;
3375 context->get_clusters = ocfs2_di_get_clusters;
3376
3377 ocfs2_init_dinode_extent_tree(&context->data_et,
3378 INODE_CACHE(inode), di_bh);
3379
3380 ret = ocfs2_replace_cow(context);
3381 if (ret)
3382 mlog_errno(ret);
3383
3384
3385
3386
3387
3388
3389 ocfs2_extent_map_trunc(inode, cow_start);
3390
3391 ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
3392 brelse(ref_root_bh);
3393out:
3394 kfree(context);
3395 return ret;
3396}
3397
3398
3399
3400
3401
3402
3403int ocfs2_refcount_cow(struct inode *inode,
3404 struct buffer_head *di_bh,
3405 u32 cpos, u32 write_len, u32 max_cpos)
3406{
3407 int ret = 0;
3408 u32 p_cluster, num_clusters;
3409 unsigned int ext_flags;
3410
3411 while (write_len) {
3412 ret = ocfs2_get_clusters(inode, cpos, &p_cluster,
3413 &num_clusters, &ext_flags);
3414 if (ret) {
3415 mlog_errno(ret);
3416 break;
3417 }
3418
3419 if (write_len < num_clusters)
3420 num_clusters = write_len;
3421
3422 if (ext_flags & OCFS2_EXT_REFCOUNTED) {
3423 ret = ocfs2_refcount_cow_hunk(inode, di_bh, cpos,
3424 num_clusters, max_cpos);
3425 if (ret) {
3426 mlog_errno(ret);
3427 break;
3428 }
3429 }
3430
3431 write_len -= num_clusters;
3432 cpos += num_clusters;
3433 }
3434
3435 return ret;
3436}
3437
3438static int ocfs2_xattr_value_get_clusters(struct ocfs2_cow_context *context,
3439 u32 v_cluster, u32 *p_cluster,
3440 u32 *num_clusters,
3441 unsigned int *extent_flags)
3442{
3443 struct inode *inode = context->inode;
3444 struct ocfs2_xattr_value_root *xv = context->cow_object;
3445
3446 return ocfs2_xattr_get_clusters(inode, v_cluster, p_cluster,
3447 num_clusters, &xv->xr_list,
3448 extent_flags);
3449}
3450
3451
3452
3453
3454
3455int ocfs2_refcounted_xattr_delete_need(struct inode *inode,
3456 struct ocfs2_caching_info *ref_ci,
3457 struct buffer_head *ref_root_bh,
3458 struct ocfs2_xattr_value_root *xv,
3459 int *meta_add, int *credits)
3460{
3461 int ret = 0, index, ref_blocks = 0;
3462 u32 p_cluster, num_clusters;
3463 u32 cpos = 0, clusters = le32_to_cpu(xv->xr_clusters);
3464 struct ocfs2_refcount_block *rb;
3465 struct ocfs2_refcount_rec rec;
3466 struct buffer_head *ref_leaf_bh = NULL;
3467
3468 while (cpos < clusters) {
3469 ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster,
3470 &num_clusters, &xv->xr_list,
3471 NULL);
3472 if (ret) {
3473 mlog_errno(ret);
3474 goto out;
3475 }
3476
3477 cpos += num_clusters;
3478
3479 while (num_clusters) {
3480 ret = ocfs2_get_refcount_rec(ref_ci, ref_root_bh,
3481 p_cluster, num_clusters,
3482 &rec, &index,
3483 &ref_leaf_bh);
3484 if (ret) {
3485 mlog_errno(ret);
3486 goto out;
3487 }
3488
3489 BUG_ON(!rec.r_refcount);
3490
3491 rb = (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
3492
3493
3494
3495
3496
3497
3498
3499
3500 if (le64_to_cpu(rb->rf_records.rl_used) + clusters * 2 >
3501 le16_to_cpu(rb->rf_records.rl_count))
3502 ref_blocks++;
3503
3504 *credits += 1;
3505 brelse(ref_leaf_bh);
3506 ref_leaf_bh = NULL;
3507
3508 if (num_clusters <= le32_to_cpu(rec.r_clusters))
3509 break;
3510 else
3511 num_clusters -= le32_to_cpu(rec.r_clusters);
3512 p_cluster += num_clusters;
3513 }
3514 }
3515
3516 *meta_add += ref_blocks;
3517 if (!ref_blocks)
3518 goto out;
3519
3520 rb = (struct ocfs2_refcount_block *)ref_root_bh->b_data;
3521 if (le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL)
3522 *credits += OCFS2_EXPAND_REFCOUNT_TREE_CREDITS;
3523 else {
3524 struct ocfs2_extent_tree et;
3525
3526 ocfs2_init_refcount_extent_tree(&et, ref_ci, ref_root_bh);
3527 *credits += ocfs2_calc_extend_credits(inode->i_sb,
3528 et.et_root_el,
3529 ref_blocks);
3530 }
3531
3532out:
3533 brelse(ref_leaf_bh);
3534 return ret;
3535}
3536
3537
3538
3539
3540int ocfs2_refcount_cow_xattr(struct inode *inode,
3541 struct ocfs2_dinode *di,
3542 struct ocfs2_xattr_value_buf *vb,
3543 struct ocfs2_refcount_tree *ref_tree,
3544 struct buffer_head *ref_root_bh,
3545 u32 cpos, u32 write_len,
3546 struct ocfs2_post_refcount *post)
3547{
3548 int ret;
3549 struct ocfs2_xattr_value_root *xv = vb->vb_xv;
3550 struct ocfs2_inode_info *oi = OCFS2_I(inode);
3551 struct ocfs2_cow_context *context = NULL;
3552 u32 cow_start, cow_len;
3553
3554 BUG_ON(!(oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL));
3555
3556 ret = ocfs2_refcount_cal_cow_clusters(inode, &xv->xr_list,
3557 cpos, write_len, UINT_MAX,
3558 &cow_start, &cow_len);
3559 if (ret) {
3560 mlog_errno(ret);
3561 goto out;
3562 }
3563
3564 BUG_ON(cow_len == 0);
3565
3566 context = kzalloc(sizeof(struct ocfs2_cow_context), GFP_NOFS);
3567 if (!context) {
3568 ret = -ENOMEM;
3569 mlog_errno(ret);
3570 goto out;
3571 }
3572
3573 context->inode = inode;
3574 context->cow_start = cow_start;
3575 context->cow_len = cow_len;
3576 context->ref_tree = ref_tree;
3577 context->ref_root_bh = ref_root_bh;;
3578 context->cow_object = xv;
3579
3580 context->cow_duplicate_clusters = ocfs2_duplicate_clusters_by_jbd;
3581
3582 context->extra_credits =
3583 ocfs2_clusters_to_blocks(inode->i_sb, 1) * cow_len;
3584 context->get_clusters = ocfs2_xattr_value_get_clusters;
3585 context->post_refcount = post;
3586
3587 ocfs2_init_xattr_value_extent_tree(&context->data_et,
3588 INODE_CACHE(inode), vb);
3589
3590 ret = ocfs2_replace_cow(context);
3591 if (ret)
3592 mlog_errno(ret);
3593
3594out:
3595 kfree(context);
3596 return ret;
3597}
3598
3599
3600
3601
3602
3603int ocfs2_add_refcount_flag(struct inode *inode,
3604 struct ocfs2_extent_tree *data_et,
3605 struct ocfs2_caching_info *ref_ci,
3606 struct buffer_head *ref_root_bh,
3607 u32 cpos, u32 p_cluster, u32 num_clusters,
3608 struct ocfs2_cached_dealloc_ctxt *dealloc,
3609 struct ocfs2_post_refcount *post)
3610{
3611 int ret;
3612 handle_t *handle;
3613 int credits = 1, ref_blocks = 0;
3614 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3615 struct ocfs2_alloc_context *meta_ac = NULL;
3616
3617 ret = ocfs2_calc_refcount_meta_credits(inode->i_sb,
3618 ref_ci, ref_root_bh,
3619 p_cluster, num_clusters,
3620 &ref_blocks, &credits);
3621 if (ret) {
3622 mlog_errno(ret);
3623 goto out;
3624 }
3625
3626 mlog(0, "reserve new metadata %d, credits = %d\n",
3627 ref_blocks, credits);
3628
3629 if (ref_blocks) {
3630 ret = ocfs2_reserve_new_metadata_blocks(OCFS2_SB(inode->i_sb),
3631 ref_blocks, &meta_ac);
3632 if (ret) {
3633 mlog_errno(ret);
3634 goto out;
3635 }
3636 }
3637
3638 if (post)
3639 credits += post->credits;
3640
3641 handle = ocfs2_start_trans(osb, credits);
3642 if (IS_ERR(handle)) {
3643 ret = PTR_ERR(handle);
3644 mlog_errno(ret);
3645 goto out;
3646 }
3647
3648 ret = ocfs2_mark_extent_refcounted(inode, data_et, handle,
3649 cpos, num_clusters, p_cluster,
3650 meta_ac, dealloc);
3651 if (ret) {
3652 mlog_errno(ret);
3653 goto out_commit;
3654 }
3655
3656 ret = __ocfs2_increase_refcount(handle, ref_ci, ref_root_bh,
3657 p_cluster, num_clusters, 0,
3658 meta_ac, dealloc);
3659 if (ret) {
3660 mlog_errno(ret);
3661 goto out_commit;
3662 }
3663
3664 if (post && post->func) {
3665 ret = post->func(inode, handle, post->para);
3666 if (ret)
3667 mlog_errno(ret);
3668 }
3669
3670out_commit:
3671 ocfs2_commit_trans(osb, handle);
3672out:
3673 if (meta_ac)
3674 ocfs2_free_alloc_context(meta_ac);
3675 return ret;
3676}
3677
3678static int ocfs2_change_ctime(struct inode *inode,
3679 struct buffer_head *di_bh)
3680{
3681 int ret;
3682 handle_t *handle;
3683 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
3684
3685 handle = ocfs2_start_trans(OCFS2_SB(inode->i_sb),
3686 OCFS2_INODE_UPDATE_CREDITS);
3687 if (IS_ERR(handle)) {
3688 ret = PTR_ERR(handle);
3689 mlog_errno(ret);
3690 goto out;
3691 }
3692
3693 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
3694 OCFS2_JOURNAL_ACCESS_WRITE);
3695 if (ret) {
3696 mlog_errno(ret);
3697 goto out_commit;
3698 }
3699
3700 inode->i_ctime = CURRENT_TIME;
3701 di->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
3702 di->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
3703
3704 ocfs2_journal_dirty(handle, di_bh);
3705
3706out_commit:
3707 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
3708out:
3709 return ret;
3710}
3711
3712static int ocfs2_attach_refcount_tree(struct inode *inode,
3713 struct buffer_head *di_bh)
3714{
3715 int ret, data_changed = 0;
3716 struct buffer_head *ref_root_bh = NULL;
3717 struct ocfs2_inode_info *oi = OCFS2_I(inode);
3718 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
3719 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3720 struct ocfs2_refcount_tree *ref_tree;
3721 unsigned int ext_flags;
3722 loff_t size;
3723 u32 cpos, num_clusters, clusters, p_cluster;
3724 struct ocfs2_cached_dealloc_ctxt dealloc;
3725 struct ocfs2_extent_tree di_et;
3726
3727 ocfs2_init_dealloc_ctxt(&dealloc);
3728
3729 if (!(oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL)) {
3730 ret = ocfs2_create_refcount_tree(inode, di_bh);
3731 if (ret) {
3732 mlog_errno(ret);
3733 goto out;
3734 }
3735 }
3736
3737 BUG_ON(!di->i_refcount_loc);
3738 ret = ocfs2_lock_refcount_tree(osb,
3739 le64_to_cpu(di->i_refcount_loc), 1,
3740 &ref_tree, &ref_root_bh);
3741 if (ret) {
3742 mlog_errno(ret);
3743 goto out;
3744 }
3745
3746 if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL)
3747 goto attach_xattr;
3748
3749 ocfs2_init_dinode_extent_tree(&di_et, INODE_CACHE(inode), di_bh);
3750
3751 size = i_size_read(inode);
3752 clusters = ocfs2_clusters_for_bytes(inode->i_sb, size);
3753
3754 cpos = 0;
3755 while (cpos < clusters) {
3756 ret = ocfs2_get_clusters(inode, cpos, &p_cluster,
3757 &num_clusters, &ext_flags);
3758
3759 if (p_cluster && !(ext_flags & OCFS2_EXT_REFCOUNTED)) {
3760 ret = ocfs2_add_refcount_flag(inode, &di_et,
3761 &ref_tree->rf_ci,
3762 ref_root_bh, cpos,
3763 p_cluster, num_clusters,
3764 &dealloc, NULL);
3765 if (ret) {
3766 mlog_errno(ret);
3767 goto unlock;
3768 }
3769
3770 data_changed = 1;
3771 }
3772 cpos += num_clusters;
3773 }
3774
3775attach_xattr:
3776 if (oi->ip_dyn_features & OCFS2_HAS_XATTR_FL) {
3777 ret = ocfs2_xattr_attach_refcount_tree(inode, di_bh,
3778 &ref_tree->rf_ci,
3779 ref_root_bh,
3780 &dealloc);
3781 if (ret) {
3782 mlog_errno(ret);
3783 goto unlock;
3784 }
3785 }
3786
3787 if (data_changed) {
3788 ret = ocfs2_change_ctime(inode, di_bh);
3789 if (ret)
3790 mlog_errno(ret);
3791 }
3792
3793unlock:
3794 ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
3795 brelse(ref_root_bh);
3796
3797 if (!ret && ocfs2_dealloc_has_cluster(&dealloc)) {
3798 ocfs2_schedule_truncate_log_flush(osb, 1);
3799 ocfs2_run_deallocs(osb, &dealloc);
3800 }
3801out:
3802
3803
3804
3805
3806 ocfs2_extent_map_trunc(inode, 0);
3807
3808 return ret;
3809}
3810
3811static int ocfs2_add_refcounted_extent(struct inode *inode,
3812 struct ocfs2_extent_tree *et,
3813 struct ocfs2_caching_info *ref_ci,
3814 struct buffer_head *ref_root_bh,
3815 u32 cpos, u32 p_cluster, u32 num_clusters,
3816 unsigned int ext_flags,
3817 struct ocfs2_cached_dealloc_ctxt *dealloc)
3818{
3819 int ret;
3820 handle_t *handle;
3821 int credits = 0;
3822 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3823 struct ocfs2_alloc_context *meta_ac = NULL;
3824
3825 ret = ocfs2_lock_refcount_allocators(inode->i_sb,
3826 p_cluster, num_clusters,
3827 et, ref_ci,
3828 ref_root_bh, &meta_ac,
3829 NULL, &credits);
3830 if (ret) {
3831 mlog_errno(ret);
3832 goto out;
3833 }
3834
3835 handle = ocfs2_start_trans(osb, credits);
3836 if (IS_ERR(handle)) {
3837 ret = PTR_ERR(handle);
3838 mlog_errno(ret);
3839 goto out;
3840 }
3841
3842 ret = ocfs2_insert_extent(handle, et, cpos,
3843 cpu_to_le64(ocfs2_clusters_to_blocks(inode->i_sb,
3844 p_cluster)),
3845 num_clusters, ext_flags, meta_ac);
3846 if (ret) {
3847 mlog_errno(ret);
3848 goto out_commit;
3849 }
3850
3851 ret = ocfs2_increase_refcount(handle, ref_ci, ref_root_bh,
3852 p_cluster, num_clusters,
3853 meta_ac, dealloc);
3854 if (ret)
3855 mlog_errno(ret);
3856
3857out_commit:
3858 ocfs2_commit_trans(osb, handle);
3859out:
3860 if (meta_ac)
3861 ocfs2_free_alloc_context(meta_ac);
3862 return ret;
3863}
3864
3865static int ocfs2_duplicate_inline_data(struct inode *s_inode,
3866 struct buffer_head *s_bh,
3867 struct inode *t_inode,
3868 struct buffer_head *t_bh)
3869{
3870 int ret;
3871 handle_t *handle;
3872 struct ocfs2_super *osb = OCFS2_SB(s_inode->i_sb);
3873 struct ocfs2_dinode *s_di = (struct ocfs2_dinode *)s_bh->b_data;
3874 struct ocfs2_dinode *t_di = (struct ocfs2_dinode *)t_bh->b_data;
3875
3876 BUG_ON(!(OCFS2_I(s_inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL));
3877
3878 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
3879 if (IS_ERR(handle)) {
3880 ret = PTR_ERR(handle);
3881 mlog_errno(ret);
3882 goto out;
3883 }
3884
3885 ret = ocfs2_journal_access_di(handle, INODE_CACHE(t_inode), t_bh,
3886 OCFS2_JOURNAL_ACCESS_WRITE);
3887 if (ret) {
3888 mlog_errno(ret);
3889 goto out_commit;
3890 }
3891
3892 t_di->id2.i_data.id_count = s_di->id2.i_data.id_count;
3893 memcpy(t_di->id2.i_data.id_data, s_di->id2.i_data.id_data,
3894 le16_to_cpu(s_di->id2.i_data.id_count));
3895 spin_lock(&OCFS2_I(t_inode)->ip_lock);
3896 OCFS2_I(t_inode)->ip_dyn_features |= OCFS2_INLINE_DATA_FL;
3897 t_di->i_dyn_features = cpu_to_le16(OCFS2_I(t_inode)->ip_dyn_features);
3898 spin_unlock(&OCFS2_I(t_inode)->ip_lock);
3899
3900 ocfs2_journal_dirty(handle, t_bh);
3901
3902out_commit:
3903 ocfs2_commit_trans(osb, handle);
3904out:
3905 return ret;
3906}
3907
3908static int ocfs2_duplicate_extent_list(struct inode *s_inode,
3909 struct inode *t_inode,
3910 struct buffer_head *t_bh,
3911 struct ocfs2_caching_info *ref_ci,
3912 struct buffer_head *ref_root_bh,
3913 struct ocfs2_cached_dealloc_ctxt *dealloc)
3914{
3915 int ret = 0;
3916 u32 p_cluster, num_clusters, clusters, cpos;
3917 loff_t size;
3918 unsigned int ext_flags;
3919 struct ocfs2_extent_tree et;
3920
3921 ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(t_inode), t_bh);
3922
3923 size = i_size_read(s_inode);
3924 clusters = ocfs2_clusters_for_bytes(s_inode->i_sb, size);
3925
3926 cpos = 0;
3927 while (cpos < clusters) {
3928 ret = ocfs2_get_clusters(s_inode, cpos, &p_cluster,
3929 &num_clusters, &ext_flags);
3930
3931 if (p_cluster) {
3932 ret = ocfs2_add_refcounted_extent(t_inode, &et,
3933 ref_ci, ref_root_bh,
3934 cpos, p_cluster,
3935 num_clusters,
3936 ext_flags,
3937 dealloc);
3938 if (ret) {
3939 mlog_errno(ret);
3940 goto out;
3941 }
3942 }
3943
3944 cpos += num_clusters;
3945 }
3946
3947out:
3948 return ret;
3949}
3950
3951
3952
3953
3954
3955
3956
3957static int ocfs2_complete_reflink(struct inode *s_inode,
3958 struct buffer_head *s_bh,
3959 struct inode *t_inode,
3960 struct buffer_head *t_bh,
3961 bool preserve)
3962{
3963 int ret;
3964 handle_t *handle;
3965 struct ocfs2_dinode *s_di = (struct ocfs2_dinode *)s_bh->b_data;
3966 struct ocfs2_dinode *di = (struct ocfs2_dinode *)t_bh->b_data;
3967 loff_t size = i_size_read(s_inode);
3968
3969 handle = ocfs2_start_trans(OCFS2_SB(t_inode->i_sb),
3970 OCFS2_INODE_UPDATE_CREDITS);
3971 if (IS_ERR(handle)) {
3972 ret = PTR_ERR(handle);
3973 mlog_errno(ret);
3974 return ret;
3975 }
3976
3977 ret = ocfs2_journal_access_di(handle, INODE_CACHE(t_inode), t_bh,
3978 OCFS2_JOURNAL_ACCESS_WRITE);
3979 if (ret) {
3980 mlog_errno(ret);
3981 goto out_commit;
3982 }
3983
3984 spin_lock(&OCFS2_I(t_inode)->ip_lock);
3985 OCFS2_I(t_inode)->ip_clusters = OCFS2_I(s_inode)->ip_clusters;
3986 OCFS2_I(t_inode)->ip_attr = OCFS2_I(s_inode)->ip_attr;
3987 OCFS2_I(t_inode)->ip_dyn_features = OCFS2_I(s_inode)->ip_dyn_features;
3988 spin_unlock(&OCFS2_I(t_inode)->ip_lock);
3989 i_size_write(t_inode, size);
3990
3991 di->i_xattr_inline_size = s_di->i_xattr_inline_size;
3992 di->i_clusters = s_di->i_clusters;
3993 di->i_size = s_di->i_size;
3994 di->i_dyn_features = s_di->i_dyn_features;
3995 di->i_attr = s_di->i_attr;
3996
3997 if (preserve) {
3998 di->i_uid = s_di->i_uid;
3999 di->i_gid = s_di->i_gid;
4000 di->i_mode = s_di->i_mode;
4001
4002
4003
4004
4005
4006
4007 t_inode->i_ctime = CURRENT_TIME;
4008
4009 di->i_ctime = cpu_to_le64(t_inode->i_ctime.tv_sec);
4010 di->i_ctime_nsec = cpu_to_le32(t_inode->i_ctime.tv_nsec);
4011
4012 t_inode->i_mtime = s_inode->i_mtime;
4013 di->i_mtime = s_di->i_mtime;
4014 di->i_mtime_nsec = s_di->i_mtime_nsec;
4015 }
4016
4017 ocfs2_journal_dirty(handle, t_bh);
4018
4019out_commit:
4020 ocfs2_commit_trans(OCFS2_SB(t_inode->i_sb), handle);
4021 return ret;
4022}
4023
4024static int ocfs2_create_reflink_node(struct inode *s_inode,
4025 struct buffer_head *s_bh,
4026 struct inode *t_inode,
4027 struct buffer_head *t_bh,
4028 bool preserve)
4029{
4030 int ret;
4031 struct buffer_head *ref_root_bh = NULL;
4032 struct ocfs2_cached_dealloc_ctxt dealloc;
4033 struct ocfs2_super *osb = OCFS2_SB(s_inode->i_sb);
4034 struct ocfs2_refcount_block *rb;
4035 struct ocfs2_dinode *di = (struct ocfs2_dinode *)s_bh->b_data;
4036 struct ocfs2_refcount_tree *ref_tree;
4037
4038 ocfs2_init_dealloc_ctxt(&dealloc);
4039
4040 ret = ocfs2_set_refcount_tree(t_inode, t_bh,
4041 le64_to_cpu(di->i_refcount_loc));
4042 if (ret) {
4043 mlog_errno(ret);
4044 goto out;
4045 }
4046
4047 if (OCFS2_I(s_inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
4048 ret = ocfs2_duplicate_inline_data(s_inode, s_bh,
4049 t_inode, t_bh);
4050 if (ret)
4051 mlog_errno(ret);
4052 goto out;
4053 }
4054
4055 ret = ocfs2_lock_refcount_tree(osb, le64_to_cpu(di->i_refcount_loc),
4056 1, &ref_tree, &ref_root_bh);
4057 if (ret) {
4058 mlog_errno(ret);
4059 goto out;
4060 }
4061 rb = (struct ocfs2_refcount_block *)ref_root_bh->b_data;
4062
4063 ret = ocfs2_duplicate_extent_list(s_inode, t_inode, t_bh,
4064 &ref_tree->rf_ci, ref_root_bh,
4065 &dealloc);
4066 if (ret) {
4067 mlog_errno(ret);
4068 goto out_unlock_refcount;
4069 }
4070
4071out_unlock_refcount:
4072 ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
4073 brelse(ref_root_bh);
4074out:
4075 if (ocfs2_dealloc_has_cluster(&dealloc)) {
4076 ocfs2_schedule_truncate_log_flush(osb, 1);
4077 ocfs2_run_deallocs(osb, &dealloc);
4078 }
4079
4080 return ret;
4081}
4082
4083static int __ocfs2_reflink(struct dentry *old_dentry,
4084 struct buffer_head *old_bh,
4085 struct inode *new_inode,
4086 bool preserve)
4087{
4088 int ret;
4089 struct inode *inode = old_dentry->d_inode;
4090 struct buffer_head *new_bh = NULL;
4091
4092 ret = filemap_fdatawrite(inode->i_mapping);
4093 if (ret) {
4094 mlog_errno(ret);
4095 goto out;
4096 }
4097
4098 ret = ocfs2_attach_refcount_tree(inode, old_bh);
4099 if (ret) {
4100 mlog_errno(ret);
4101 goto out;
4102 }
4103
4104 mutex_lock(&new_inode->i_mutex);
4105 ret = ocfs2_inode_lock(new_inode, &new_bh, 1);
4106 if (ret) {
4107 mlog_errno(ret);
4108 goto out_unlock;
4109 }
4110
4111 ret = ocfs2_create_reflink_node(inode, old_bh,
4112 new_inode, new_bh, preserve);
4113 if (ret) {
4114 mlog_errno(ret);
4115 goto inode_unlock;
4116 }
4117
4118 if (OCFS2_I(inode)->ip_dyn_features & OCFS2_HAS_XATTR_FL) {
4119 ret = ocfs2_reflink_xattrs(inode, old_bh,
4120 new_inode, new_bh,
4121 preserve);
4122 if (ret) {
4123 mlog_errno(ret);
4124 goto inode_unlock;
4125 }
4126 }
4127
4128 ret = ocfs2_complete_reflink(inode, old_bh,
4129 new_inode, new_bh, preserve);
4130 if (ret)
4131 mlog_errno(ret);
4132
4133inode_unlock:
4134 ocfs2_inode_unlock(new_inode, 1);
4135 brelse(new_bh);
4136out_unlock:
4137 mutex_unlock(&new_inode->i_mutex);
4138out:
4139 if (!ret) {
4140 ret = filemap_fdatawait(inode->i_mapping);
4141 if (ret)
4142 mlog_errno(ret);
4143 }
4144 return ret;
4145}
4146
4147static int ocfs2_reflink(struct dentry *old_dentry, struct inode *dir,
4148 struct dentry *new_dentry, bool preserve)
4149{
4150 int error;
4151 struct inode *inode = old_dentry->d_inode;
4152 struct buffer_head *old_bh = NULL;
4153 struct inode *new_orphan_inode = NULL;
4154
4155 if (!ocfs2_refcount_tree(OCFS2_SB(inode->i_sb)))
4156 return -EOPNOTSUPP;
4157
4158 error = ocfs2_create_inode_in_orphan(dir, inode->i_mode,
4159 &new_orphan_inode);
4160 if (error) {
4161 mlog_errno(error);
4162 goto out;
4163 }
4164
4165 error = ocfs2_inode_lock(inode, &old_bh, 1);
4166 if (error) {
4167 mlog_errno(error);
4168 goto out;
4169 }
4170
4171 down_write(&OCFS2_I(inode)->ip_xattr_sem);
4172 down_write(&OCFS2_I(inode)->ip_alloc_sem);
4173 error = __ocfs2_reflink(old_dentry, old_bh,
4174 new_orphan_inode, preserve);
4175 up_write(&OCFS2_I(inode)->ip_alloc_sem);
4176 up_write(&OCFS2_I(inode)->ip_xattr_sem);
4177
4178 ocfs2_inode_unlock(inode, 1);
4179 brelse(old_bh);
4180
4181 if (error) {
4182 mlog_errno(error);
4183 goto out;
4184 }
4185
4186
4187 if (!preserve) {
4188 error = ocfs2_init_security_and_acl(dir, new_orphan_inode);
4189 if (error)
4190 mlog_errno(error);
4191 }
4192out:
4193 if (!error) {
4194 error = ocfs2_mv_orphaned_inode_to_new(dir, new_orphan_inode,
4195 new_dentry);
4196 if (error)
4197 mlog_errno(error);
4198 }
4199
4200 if (new_orphan_inode) {
4201
4202
4203
4204
4205 ocfs2_open_unlock(new_orphan_inode);
4206 if (error)
4207 iput(new_orphan_inode);
4208 }
4209
4210 return error;
4211}
4212
4213
4214
4215
4216
4217
4218
4219
4220static inline int ocfs2_may_create(struct inode *dir, struct dentry *child)
4221{
4222 if (child->d_inode)
4223 return -EEXIST;
4224 if (IS_DEADDIR(dir))
4225 return -ENOENT;
4226 return inode_permission(dir, MAY_WRITE | MAY_EXEC);
4227}
4228
4229
4230static int ocfs2_user_path_parent(const char __user *path,
4231 struct nameidata *nd, char **name)
4232{
4233 char *s = getname(path);
4234 int error;
4235
4236 if (IS_ERR(s))
4237 return PTR_ERR(s);
4238
4239 error = path_lookup(s, LOOKUP_PARENT, nd);
4240 if (error)
4241 putname(s);
4242 else
4243 *name = s;
4244
4245 return error;
4246}
4247
4248
4249
4250
4251
4252
4253
4254
4255
4256int ocfs2_vfs_reflink(struct dentry *old_dentry, struct inode *dir,
4257 struct dentry *new_dentry, bool preserve)
4258{
4259 struct inode *inode = old_dentry->d_inode;
4260 int error;
4261
4262 if (!inode)
4263 return -ENOENT;
4264
4265 error = ocfs2_may_create(dir, new_dentry);
4266 if (error)
4267 return error;
4268
4269 if (dir->i_sb != inode->i_sb)
4270 return -EXDEV;
4271
4272
4273
4274
4275 if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
4276 return -EPERM;
4277
4278
4279 if (!S_ISREG(inode->i_mode))
4280 return -EPERM;
4281
4282
4283
4284
4285
4286 if (preserve) {
4287 if ((current_fsuid() != inode->i_uid) && !capable(CAP_CHOWN))
4288 return -EPERM;
4289 if (!in_group_p(inode->i_gid) && !capable(CAP_CHOWN))
4290 return -EPERM;
4291 }
4292
4293
4294
4295
4296
4297
4298 if (!preserve) {
4299 error = inode_permission(inode, MAY_READ);
4300 if (error)
4301 return error;
4302 }
4303
4304 mutex_lock(&inode->i_mutex);
4305 vfs_dq_init(dir);
4306 error = ocfs2_reflink(old_dentry, dir, new_dentry, preserve);
4307 mutex_unlock(&inode->i_mutex);
4308 if (!error)
4309 fsnotify_create(dir, new_dentry);
4310 return error;
4311}
4312
4313
4314
4315int ocfs2_reflink_ioctl(struct inode *inode,
4316 const char __user *oldname,
4317 const char __user *newname,
4318 bool preserve)
4319{
4320 struct dentry *new_dentry;
4321 struct nameidata nd;
4322 struct path old_path;
4323 int error;
4324 char *to = NULL;
4325
4326 if (!ocfs2_refcount_tree(OCFS2_SB(inode->i_sb)))
4327 return -EOPNOTSUPP;
4328
4329 error = user_path_at(AT_FDCWD, oldname, 0, &old_path);
4330 if (error) {
4331 mlog_errno(error);
4332 return error;
4333 }
4334
4335 error = ocfs2_user_path_parent(newname, &nd, &to);
4336 if (error) {
4337 mlog_errno(error);
4338 goto out;
4339 }
4340
4341 error = -EXDEV;
4342 if (old_path.mnt != nd.path.mnt)
4343 goto out_release;
4344 new_dentry = lookup_create(&nd, 0);
4345 error = PTR_ERR(new_dentry);
4346 if (IS_ERR(new_dentry)) {
4347 mlog_errno(error);
4348 goto out_unlock;
4349 }
4350
4351 error = mnt_want_write(nd.path.mnt);
4352 if (error) {
4353 mlog_errno(error);
4354 goto out_dput;
4355 }
4356
4357 error = ocfs2_vfs_reflink(old_path.dentry,
4358 nd.path.dentry->d_inode,
4359 new_dentry, preserve);
4360 mnt_drop_write(nd.path.mnt);
4361out_dput:
4362 dput(new_dentry);
4363out_unlock:
4364 mutex_unlock(&nd.path.dentry->d_inode->i_mutex);
4365out_release:
4366 path_put(&nd.path);
4367 putname(to);
4368out:
4369 path_put(&old_path);
4370
4371 return error;
4372}
4373