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OMAP: DSS2: fix irq-stats compilation
[linux/fpc-iii.git] / fs / ocfs2 / refcounttree.c
blob74db2be75dd686220913207662dd0c04ea7c755d
1 /* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
3 *
4 * refcounttree.c
5 *
6 * Copyright (C) 2009 Oracle. All rights reserved.
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public
10 * License version 2 as published by the Free Software Foundation.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
16 */
17
18 #include <linux/sort.h>
19 #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
51 struct 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
74 static inline struct ocfs2_refcount_tree *
75 cache_info_to_refcount(struct ocfs2_caching_info *ci)
76 {
77 return container_of(ci, struct ocfs2_refcount_tree, rf_ci);
78 }
79
80 static int ocfs2_validate_refcount_block(struct super_block *sb,
81 struct buffer_head *bh)
82 {
83 int rc;
84 struct ocfs2_refcount_block *rb =
85 (struct ocfs2_refcount_block *)bh->b_data;
86
87 mlog(0, "Validating refcount block %llu\n",
88 (unsigned long long)bh->b_blocknr);
89
90 BUG_ON(!buffer_uptodate(bh));
91
92 /*
93 * If the ecc fails, we return the error but otherwise
94 * leave the filesystem running. We know any error is
95 * local to this block.
96 */
97 rc = ocfs2_validate_meta_ecc(sb, bh->b_data, &rb->rf_check);
98 if (rc) {
99 mlog(ML_ERROR, "Checksum failed for refcount block %llu\n",
100 (unsigned long long)bh->b_blocknr);
101 return rc;
102 }
103
104
105 if (!OCFS2_IS_VALID_REFCOUNT_BLOCK(rb)) {
106 ocfs2_error(sb,
107 "Refcount block #%llu has bad signature %.*s",
108 (unsigned long long)bh->b_blocknr, 7,
109 rb->rf_signature);
110 return -EINVAL;
111 }
112
113 if (le64_to_cpu(rb->rf_blkno) != bh->b_blocknr) {
114 ocfs2_error(sb,
115 "Refcount block #%llu has an invalid rf_blkno "
116 "of %llu",
117 (unsigned long long)bh->b_blocknr,
118 (unsigned long long)le64_to_cpu(rb->rf_blkno));
119 return -EINVAL;
120 }
121
122 if (le32_to_cpu(rb->rf_fs_generation) != OCFS2_SB(sb)->fs_generation) {
123 ocfs2_error(sb,
124 "Refcount block #%llu has an invalid "
125 "rf_fs_generation of #%u",
126 (unsigned long long)bh->b_blocknr,
127 le32_to_cpu(rb->rf_fs_generation));
128 return -EINVAL;
129 }
130
131 return 0;
132 }
133
134 static int ocfs2_read_refcount_block(struct ocfs2_caching_info *ci,
135 u64 rb_blkno,
136 struct buffer_head **bh)
137 {
138 int rc;
139 struct buffer_head *tmp = *bh;
140
141 rc = ocfs2_read_block(ci, rb_blkno, &tmp,
142 ocfs2_validate_refcount_block);
143
144 /* If ocfs2_read_block() got us a new bh, pass it up. */
145 if (!rc && !*bh)
146 *bh = tmp;
147
148 return rc;
149 }
150
151 static u64 ocfs2_refcount_cache_owner(struct ocfs2_caching_info *ci)
152 {
153 struct ocfs2_refcount_tree *rf = cache_info_to_refcount(ci);
154
155 return rf->rf_blkno;
156 }
157
158 static struct super_block *
159 ocfs2_refcount_cache_get_super(struct ocfs2_caching_info *ci)
160 {
161 struct ocfs2_refcount_tree *rf = cache_info_to_refcount(ci);
162
163 return rf->rf_sb;
164 }
165
166 static void ocfs2_refcount_cache_lock(struct ocfs2_caching_info *ci)
167 {
168 struct ocfs2_refcount_tree *rf = cache_info_to_refcount(ci);
169
170 spin_lock(&rf->rf_lock);
171 }
172
173 static void ocfs2_refcount_cache_unlock(struct ocfs2_caching_info *ci)
174 {
175 struct ocfs2_refcount_tree *rf = cache_info_to_refcount(ci);
176
177 spin_unlock(&rf->rf_lock);
178 }
179
180 static void ocfs2_refcount_cache_io_lock(struct ocfs2_caching_info *ci)
181 {
182 struct ocfs2_refcount_tree *rf = cache_info_to_refcount(ci);
183
184 mutex_lock(&rf->rf_io_mutex);
185 }
186
187 static void ocfs2_refcount_cache_io_unlock(struct ocfs2_caching_info *ci)
188 {
189 struct ocfs2_refcount_tree *rf = cache_info_to_refcount(ci);
190
191 mutex_unlock(&rf->rf_io_mutex);
192 }
193
194 static const struct ocfs2_caching_operations ocfs2_refcount_caching_ops = {
195 .co_owner = ocfs2_refcount_cache_owner,
196 .co_get_super = ocfs2_refcount_cache_get_super,
197 .co_cache_lock = ocfs2_refcount_cache_lock,
198 .co_cache_unlock = ocfs2_refcount_cache_unlock,
199 .co_io_lock = ocfs2_refcount_cache_io_lock,
200 .co_io_unlock = ocfs2_refcount_cache_io_unlock,
201 };
202
203 static struct ocfs2_refcount_tree *
204 ocfs2_find_refcount_tree(struct ocfs2_super *osb, u64 blkno)
205 {
206 struct rb_node *n = osb->osb_rf_lock_tree.rb_node;
207 struct ocfs2_refcount_tree *tree = NULL;
208
209 while (n) {
210 tree = rb_entry(n, struct ocfs2_refcount_tree, rf_node);
211
212 if (blkno < tree->rf_blkno)
213 n = n->rb_left;
214 else if (blkno > tree->rf_blkno)
215 n = n->rb_right;
216 else
217 return tree;
218 }
219
220 return NULL;
221 }
222
223 /* osb_lock is already locked. */
224 static void ocfs2_insert_refcount_tree(struct ocfs2_super *osb,
225 struct ocfs2_refcount_tree *new)
226 {
227 u64 rf_blkno = new->rf_blkno;
228 struct rb_node *parent = NULL;
229 struct rb_node **p = &osb->osb_rf_lock_tree.rb_node;
230 struct ocfs2_refcount_tree *tmp;
231
232 while (*p) {
233 parent = *p;
234
235 tmp = rb_entry(parent, struct ocfs2_refcount_tree,
236 rf_node);
237
238 if (rf_blkno < tmp->rf_blkno)
239 p = &(*p)->rb_left;
240 else if (rf_blkno > tmp->rf_blkno)
241 p = &(*p)->rb_right;
242 else {
243 /* This should never happen! */
244 mlog(ML_ERROR, "Duplicate refcount block %llu found!\n",
245 (unsigned long long)rf_blkno);
246 BUG();
247 }
248 }
249
250 rb_link_node(&new->rf_node, parent, p);
251 rb_insert_color(&new->rf_node, &osb->osb_rf_lock_tree);
252 }
253
254 static void ocfs2_free_refcount_tree(struct ocfs2_refcount_tree *tree)
255 {
256 ocfs2_metadata_cache_exit(&tree->rf_ci);
257 ocfs2_simple_drop_lockres(OCFS2_SB(tree->rf_sb), &tree->rf_lockres);
258 ocfs2_lock_res_free(&tree->rf_lockres);
259 kfree(tree);
260 }
261
262 static inline void
263 ocfs2_erase_refcount_tree_from_list_no_lock(struct ocfs2_super *osb,
264 struct ocfs2_refcount_tree *tree)
265 {
266 rb_erase(&tree->rf_node, &osb->osb_rf_lock_tree);
267 if (osb->osb_ref_tree_lru && osb->osb_ref_tree_lru == tree)
268 osb->osb_ref_tree_lru = NULL;
269 }
270
271 static void ocfs2_erase_refcount_tree_from_list(struct ocfs2_super *osb,
272 struct ocfs2_refcount_tree *tree)
273 {
274 spin_lock(&osb->osb_lock);
275 ocfs2_erase_refcount_tree_from_list_no_lock(osb, tree);
276 spin_unlock(&osb->osb_lock);
277 }
278
279 static void ocfs2_kref_remove_refcount_tree(struct kref *kref)
280 {
281 struct ocfs2_refcount_tree *tree =
282 container_of(kref, struct ocfs2_refcount_tree, rf_getcnt);
283
284 ocfs2_free_refcount_tree(tree);
285 }
286
287 static inline void
288 ocfs2_refcount_tree_get(struct ocfs2_refcount_tree *tree)
289 {
290 kref_get(&tree->rf_getcnt);
291 }
292
293 static inline void
294 ocfs2_refcount_tree_put(struct ocfs2_refcount_tree *tree)
295 {
296 kref_put(&tree->rf_getcnt, ocfs2_kref_remove_refcount_tree);
297 }
298
299 static inline void ocfs2_init_refcount_tree_ci(struct ocfs2_refcount_tree *new,
300 struct super_block *sb)
301 {
302 ocfs2_metadata_cache_init(&new->rf_ci, &ocfs2_refcount_caching_ops);
303 mutex_init(&new->rf_io_mutex);
304 new->rf_sb = sb;
305 spin_lock_init(&new->rf_lock);
306 }
307
308 static inline void ocfs2_init_refcount_tree_lock(struct ocfs2_super *osb,
309 struct ocfs2_refcount_tree *new,
310 u64 rf_blkno, u32 generation)
311 {
312 init_rwsem(&new->rf_sem);
313 ocfs2_refcount_lock_res_init(&new->rf_lockres, osb,
314 rf_blkno, generation);
315 }
316
317 static struct ocfs2_refcount_tree*
318 ocfs2_allocate_refcount_tree(struct ocfs2_super *osb, u64 rf_blkno)
319 {
320 struct ocfs2_refcount_tree *new;
321
322 new = kzalloc(sizeof(struct ocfs2_refcount_tree), GFP_NOFS);
323 if (!new)
324 return NULL;
325
326 new->rf_blkno = rf_blkno;
327 kref_init(&new->rf_getcnt);
328 ocfs2_init_refcount_tree_ci(new, osb->sb);
329
330 return new;
331 }
332
333 static int ocfs2_get_refcount_tree(struct ocfs2_super *osb, u64 rf_blkno,
334 struct ocfs2_refcount_tree **ret_tree)
335 {
336 int ret = 0;
337 struct ocfs2_refcount_tree *tree, *new = NULL;
338 struct buffer_head *ref_root_bh = NULL;
339 struct ocfs2_refcount_block *ref_rb;
340
341 spin_lock(&osb->osb_lock);
342 if (osb->osb_ref_tree_lru &&
343 osb->osb_ref_tree_lru->rf_blkno == rf_blkno)
344 tree = osb->osb_ref_tree_lru;
345 else
346 tree = ocfs2_find_refcount_tree(osb, rf_blkno);
347 if (tree)
348 goto out;
349
350 spin_unlock(&osb->osb_lock);
351
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 * We need the generation to create the refcount tree lock and since
360 * it isn't changed during the tree modification, we are safe here to
361 * read without protection.
362 * We also have to purge the cache after we create the lock since the
363 * refcount block may have the stale data. It can only be trusted when
364 * we hold the refcount lock.
365 */
366 ret = ocfs2_read_refcount_block(&new->rf_ci, rf_blkno, &ref_root_bh);
367 if (ret) {
368 mlog_errno(ret);
369 ocfs2_metadata_cache_exit(&new->rf_ci);
370 kfree(new);
371 return ret;
372 }
373
374 ref_rb = (struct ocfs2_refcount_block *)ref_root_bh->b_data;
375 new->rf_generation = le32_to_cpu(ref_rb->rf_generation);
376 ocfs2_init_refcount_tree_lock(osb, new, rf_blkno,
377 new->rf_generation);
378 ocfs2_metadata_cache_purge(&new->rf_ci);
379
380 spin_lock(&osb->osb_lock);
381 tree = ocfs2_find_refcount_tree(osb, rf_blkno);
382 if (tree)
383 goto out;
384
385 ocfs2_insert_refcount_tree(osb, new);
386
387 tree = new;
388 new = NULL;
389
390 out:
391 *ret_tree = tree;
392
393 osb->osb_ref_tree_lru = tree;
394
395 spin_unlock(&osb->osb_lock);
396
397 if (new)
398 ocfs2_free_refcount_tree(new);
399
400 brelse(ref_root_bh);
401 return ret;
402 }
403
404 static int ocfs2_get_refcount_block(struct inode *inode, u64 *ref_blkno)
405 {
406 int ret;
407 struct buffer_head *di_bh = NULL;
408 struct ocfs2_dinode *di;
409
410 ret = ocfs2_read_inode_block(inode, &di_bh);
411 if (ret) {
412 mlog_errno(ret);
413 goto out;
414 }
415
416 BUG_ON(!(OCFS2_I(inode)->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL));
417
418 di = (struct ocfs2_dinode *)di_bh->b_data;
419 *ref_blkno = le64_to_cpu(di->i_refcount_loc);
420 brelse(di_bh);
421 out:
422 return ret;
423 }
424
425 static int __ocfs2_lock_refcount_tree(struct ocfs2_super *osb,
426 struct ocfs2_refcount_tree *tree, int rw)
427 {
428 int ret;
429
430 ret = ocfs2_refcount_lock(tree, rw);
431 if (ret) {
432 mlog_errno(ret);
433 goto out;
434 }
435
436 if (rw)
437 down_write(&tree->rf_sem);
438 else
439 down_read(&tree->rf_sem);
440
441 out:
442 return ret;
443 }
444
445 /*
446 * Lock the refcount tree pointed by ref_blkno and return the tree.
447 * In most case, we lock the tree and read the refcount block.
448 * So read it here if the caller really needs it.
449 *
450 * If the tree has been re-created by other node, it will free the
451 * old one and re-create it.
452 */
453 int ocfs2_lock_refcount_tree(struct ocfs2_super *osb,
454 u64 ref_blkno, int rw,
455 struct ocfs2_refcount_tree **ret_tree,
456 struct buffer_head **ref_bh)
457 {
458 int ret, delete_tree = 0;
459 struct ocfs2_refcount_tree *tree = NULL;
460 struct buffer_head *ref_root_bh = NULL;
461 struct ocfs2_refcount_block *rb;
462
463 again:
464 ret = ocfs2_get_refcount_tree(osb, ref_blkno, &tree);
465 if (ret) {
466 mlog_errno(ret);
467 return ret;
468 }
469
470 ocfs2_refcount_tree_get(tree);
471
472 ret = __ocfs2_lock_refcount_tree(osb, tree, rw);
473 if (ret) {
474 mlog_errno(ret);
475 ocfs2_refcount_tree_put(tree);
476 goto out;
477 }
478
479 ret = ocfs2_read_refcount_block(&tree->rf_ci, tree->rf_blkno,
480 &ref_root_bh);
481 if (ret) {
482 mlog_errno(ret);
483 ocfs2_unlock_refcount_tree(osb, tree, rw);
484 ocfs2_refcount_tree_put(tree);
485 goto out;
486 }
487
488 rb = (struct ocfs2_refcount_block *)ref_root_bh->b_data;
489 /*
490 * If the refcount block has been freed and re-created, we may need
491 * to recreate the refcount tree also.
492 *
493 * Here we just remove the tree from the rb-tree, and the last
494 * kref holder will unlock and delete this refcount_tree.
495 * Then we goto "again" and ocfs2_get_refcount_tree will create
496 * the new refcount tree for us.
497 */
498 if (tree->rf_generation != le32_to_cpu(rb->rf_generation)) {
499 if (!tree->rf_removed) {
500 ocfs2_erase_refcount_tree_from_list(osb, tree);
501 tree->rf_removed = 1;
502 delete_tree = 1;
503 }
504
505 ocfs2_unlock_refcount_tree(osb, tree, rw);
506 /*
507 * We get an extra reference when we create the refcount
508 * tree, so another put will destroy it.
509 */
510 if (delete_tree)
511 ocfs2_refcount_tree_put(tree);
512 brelse(ref_root_bh);
513 ref_root_bh = NULL;
514 goto again;
515 }
516
517 *ret_tree = tree;
518 if (ref_bh) {
519 *ref_bh = ref_root_bh;
520 ref_root_bh = NULL;
521 }
522 out:
523 brelse(ref_root_bh);
524 return ret;
525 }
526
527 void ocfs2_unlock_refcount_tree(struct ocfs2_super *osb,
528 struct ocfs2_refcount_tree *tree, int rw)
529 {
530 if (rw)
531 up_write(&tree->rf_sem);
532 else
533 up_read(&tree->rf_sem);
534
535 ocfs2_refcount_unlock(tree, rw);
536 ocfs2_refcount_tree_put(tree);
537 }
538
539 void ocfs2_purge_refcount_trees(struct ocfs2_super *osb)
540 {
541 struct rb_node *node;
542 struct ocfs2_refcount_tree *tree;
543 struct rb_root *root = &osb->osb_rf_lock_tree;
544
545 while ((node = rb_last(root)) != NULL) {
546 tree = rb_entry(node, struct ocfs2_refcount_tree, rf_node);
547
548 mlog(0, "Purge tree %llu\n",
549 (unsigned long long) tree->rf_blkno);
550
551 rb_erase(&tree->rf_node, root);
552 ocfs2_free_refcount_tree(tree);
553 }
554 }
555
556 /*
557 * Create a refcount tree for an inode.
558 * We take for granted that the inode is already locked.
559 */
560 static int ocfs2_create_refcount_tree(struct inode *inode,
561 struct buffer_head *di_bh)
562 {
563 int ret;
564 handle_t *handle = NULL;
565 struct ocfs2_alloc_context *meta_ac = NULL;
566 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
567 struct ocfs2_inode_info *oi = OCFS2_I(inode);
568 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
569 struct buffer_head *new_bh = NULL;
570 struct ocfs2_refcount_block *rb;
571 struct ocfs2_refcount_tree *new_tree = NULL, *tree = NULL;
572 u16 suballoc_bit_start;
573 u32 num_got;
574 u64 first_blkno;
575
576 BUG_ON(oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL);
577
578 mlog(0, "create tree for inode %lu\n", inode->i_ino);
579
580 ret = ocfs2_reserve_new_metadata_blocks(osb, 1, &meta_ac);
581 if (ret) {
582 mlog_errno(ret);
583 goto out;
584 }
585
586 handle = ocfs2_start_trans(osb, OCFS2_REFCOUNT_TREE_CREATE_CREDITS);
587 if (IS_ERR(handle)) {
588 ret = PTR_ERR(handle);
589 mlog_errno(ret);
590 goto out;
591 }
592
593 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
594 OCFS2_JOURNAL_ACCESS_WRITE);
595 if (ret) {
596 mlog_errno(ret);
597 goto out_commit;
598 }
599
600 ret = ocfs2_claim_metadata(osb, handle, meta_ac, 1,
601 &suballoc_bit_start, &num_got,
602 &first_blkno);
603 if (ret) {
604 mlog_errno(ret);
605 goto out_commit;
606 }
607
608 new_tree = ocfs2_allocate_refcount_tree(osb, first_blkno);
609 if (!new_tree) {
610 ret = -ENOMEM;
611 mlog_errno(ret);
612 goto out_commit;
613 }
614
615 new_bh = sb_getblk(inode->i_sb, first_blkno);
616 ocfs2_set_new_buffer_uptodate(&new_tree->rf_ci, new_bh);
617
618 ret = ocfs2_journal_access_rb(handle, &new_tree->rf_ci, new_bh,
619 OCFS2_JOURNAL_ACCESS_CREATE);
620 if (ret) {
621 mlog_errno(ret);
622 goto out_commit;
623 }
624
625 /* Initialize ocfs2_refcount_block. */
626 rb = (struct ocfs2_refcount_block *)new_bh->b_data;
627 memset(rb, 0, inode->i_sb->s_blocksize);
628 strcpy((void *)rb, OCFS2_REFCOUNT_BLOCK_SIGNATURE);
629 rb->rf_suballoc_slot = cpu_to_le16(osb->slot_num);
630 rb->rf_suballoc_bit = cpu_to_le16(suballoc_bit_start);
631 rb->rf_fs_generation = cpu_to_le32(osb->fs_generation);
632 rb->rf_blkno = cpu_to_le64(first_blkno);
633 rb->rf_count = cpu_to_le32(1);
634 rb->rf_records.rl_count =
635 cpu_to_le16(ocfs2_refcount_recs_per_rb(osb->sb));
636 spin_lock(&osb->osb_lock);
637 rb->rf_generation = osb->s_next_generation++;
638 spin_unlock(&osb->osb_lock);
639
640 ocfs2_journal_dirty(handle, new_bh);
641
642 spin_lock(&oi->ip_lock);
643 oi->ip_dyn_features |= OCFS2_HAS_REFCOUNT_FL;
644 di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
645 di->i_refcount_loc = cpu_to_le64(first_blkno);
646 spin_unlock(&oi->ip_lock);
647
648 mlog(0, "created tree for inode %lu, refblock %llu\n",
649 inode->i_ino, (unsigned long long)first_blkno);
650
651 ocfs2_journal_dirty(handle, di_bh);
652
653 /*
654 * We have to init the tree lock here since it will use
655 * the generation number to create it.
656 */
657 new_tree->rf_generation = le32_to_cpu(rb->rf_generation);
658 ocfs2_init_refcount_tree_lock(osb, new_tree, first_blkno,
659 new_tree->rf_generation);
660
661 spin_lock(&osb->osb_lock);
662 tree = ocfs2_find_refcount_tree(osb, first_blkno);
663
664 /*
665 * We've just created a new refcount tree in this block. If
666 * we found a refcount tree on the ocfs2_super, it must be
667 * one we just deleted. We free the old tree before
668 * inserting the new tree.
669 */
670 BUG_ON(tree && tree->rf_generation == new_tree->rf_generation);
671 if (tree)
672 ocfs2_erase_refcount_tree_from_list_no_lock(osb, tree);
673 ocfs2_insert_refcount_tree(osb, new_tree);
674 spin_unlock(&osb->osb_lock);
675 new_tree = NULL;
676 if (tree)
677 ocfs2_refcount_tree_put(tree);
678
679 out_commit:
680 ocfs2_commit_trans(osb, handle);
681
682 out:
683 if (new_tree) {
684 ocfs2_metadata_cache_exit(&new_tree->rf_ci);
685 kfree(new_tree);
686 }
687
688 brelse(new_bh);
689 if (meta_ac)
690 ocfs2_free_alloc_context(meta_ac);
691
692 return ret;
693 }
694
695 static int ocfs2_set_refcount_tree(struct inode *inode,
696 struct buffer_head *di_bh,
697 u64 refcount_loc)
698 {
699 int ret;
700 handle_t *handle = NULL;
701 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
702 struct ocfs2_inode_info *oi = OCFS2_I(inode);
703 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
704 struct buffer_head *ref_root_bh = NULL;
705 struct ocfs2_refcount_block *rb;
706 struct ocfs2_refcount_tree *ref_tree;
707
708 BUG_ON(oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL);
709
710 ret = ocfs2_lock_refcount_tree(osb, refcount_loc, 1,
711 &ref_tree, &ref_root_bh);
712 if (ret) {
713 mlog_errno(ret);
714 return ret;
715 }
716
717 handle = ocfs2_start_trans(osb, OCFS2_REFCOUNT_TREE_SET_CREDITS);
718 if (IS_ERR(handle)) {
719 ret = PTR_ERR(handle);
720 mlog_errno(ret);
721 goto out;
722 }
723
724 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
725 OCFS2_JOURNAL_ACCESS_WRITE);
726 if (ret) {
727 mlog_errno(ret);
728 goto out_commit;
729 }
730
731 ret = ocfs2_journal_access_rb(handle, &ref_tree->rf_ci, ref_root_bh,
732 OCFS2_JOURNAL_ACCESS_WRITE);
733 if (ret) {
734 mlog_errno(ret);
735 goto out_commit;
736 }
737
738 rb = (struct ocfs2_refcount_block *)ref_root_bh->b_data;
739 le32_add_cpu(&rb->rf_count, 1);
740
741 ocfs2_journal_dirty(handle, ref_root_bh);
742
743 spin_lock(&oi->ip_lock);
744 oi->ip_dyn_features |= OCFS2_HAS_REFCOUNT_FL;
745 di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
746 di->i_refcount_loc = cpu_to_le64(refcount_loc);
747 spin_unlock(&oi->ip_lock);
748 ocfs2_journal_dirty(handle, di_bh);
749
750 out_commit:
751 ocfs2_commit_trans(osb, handle);
752 out:
753 ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
754 brelse(ref_root_bh);
755
756 return ret;
757 }
758
759 int ocfs2_remove_refcount_tree(struct inode *inode, struct buffer_head *di_bh)
760 {
761 int ret, delete_tree = 0;
762 handle_t *handle = NULL;
763 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
764 struct ocfs2_inode_info *oi = OCFS2_I(inode);
765 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
766 struct ocfs2_refcount_block *rb;
767 struct inode *alloc_inode = NULL;
768 struct buffer_head *alloc_bh = NULL;
769 struct buffer_head *blk_bh = NULL;
770 struct ocfs2_refcount_tree *ref_tree;
771 int credits = OCFS2_REFCOUNT_TREE_REMOVE_CREDITS;
772 u64 blk = 0, bg_blkno = 0, ref_blkno = le64_to_cpu(di->i_refcount_loc);
773 u16 bit = 0;
774
775 if (!(oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL))
776 return 0;
777
778 BUG_ON(!ref_blkno);
779 ret = ocfs2_lock_refcount_tree(osb, ref_blkno, 1, &ref_tree, &blk_bh);
780 if (ret) {
781 mlog_errno(ret);
782 return ret;
783 }
784
785 rb = (struct ocfs2_refcount_block *)blk_bh->b_data;
786
787 /*
788 * If we are the last user, we need to free the block.
789 * So lock the allocator ahead.
790 */
791 if (le32_to_cpu(rb->rf_count) == 1) {
792 blk = le64_to_cpu(rb->rf_blkno);
793 bit = le16_to_cpu(rb->rf_suballoc_bit);
794 bg_blkno = ocfs2_which_suballoc_group(blk, bit);
795
796 alloc_inode = ocfs2_get_system_file_inode(osb,
797 EXTENT_ALLOC_SYSTEM_INODE,
798 le16_to_cpu(rb->rf_suballoc_slot));
799 if (!alloc_inode) {
800 ret = -ENOMEM;
801 mlog_errno(ret);
802 goto out;
803 }
804 mutex_lock(&alloc_inode->i_mutex);
805
806 ret = ocfs2_inode_lock(alloc_inode, &alloc_bh, 1);
807 if (ret) {
808 mlog_errno(ret);
809 goto out_mutex;
810 }
811
812 credits += OCFS2_SUBALLOC_FREE;
813 }
814
815 handle = ocfs2_start_trans(osb, credits);
816 if (IS_ERR(handle)) {
817 ret = PTR_ERR(handle);
818 mlog_errno(ret);
819 goto out_unlock;
820 }
821
822 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
823 OCFS2_JOURNAL_ACCESS_WRITE);
824 if (ret) {
825 mlog_errno(ret);
826 goto out_commit;
827 }
828
829 ret = ocfs2_journal_access_rb(handle, &ref_tree->rf_ci, blk_bh,
830 OCFS2_JOURNAL_ACCESS_WRITE);
831 if (ret) {
832 mlog_errno(ret);
833 goto out_commit;
834 }
835
836 spin_lock(&oi->ip_lock);
837 oi->ip_dyn_features &= ~OCFS2_HAS_REFCOUNT_FL;
838 di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
839 di->i_refcount_loc = 0;
840 spin_unlock(&oi->ip_lock);
841 ocfs2_journal_dirty(handle, di_bh);
842
843 le32_add_cpu(&rb->rf_count , -1);
844 ocfs2_journal_dirty(handle, blk_bh);
845
846 if (!rb->rf_count) {
847 delete_tree = 1;
848 ocfs2_erase_refcount_tree_from_list(osb, ref_tree);
849 ret = ocfs2_free_suballoc_bits(handle, alloc_inode,
850 alloc_bh, bit, bg_blkno, 1);
851 if (ret)
852 mlog_errno(ret);
853 }
854
855 out_commit:
856 ocfs2_commit_trans(osb, handle);
857 out_unlock:
858 if (alloc_inode) {
859 ocfs2_inode_unlock(alloc_inode, 1);
860 brelse(alloc_bh);
861 }
862 out_mutex:
863 if (alloc_inode) {
864 mutex_unlock(&alloc_inode->i_mutex);
865 iput(alloc_inode);
866 }
867 out:
868 ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
869 if (delete_tree)
870 ocfs2_refcount_tree_put(ref_tree);
871 brelse(blk_bh);
872
873 return ret;
874 }
875
876 static void ocfs2_find_refcount_rec_in_rl(struct ocfs2_caching_info *ci,
877 struct buffer_head *ref_leaf_bh,
878 u64 cpos, unsigned int len,
879 struct ocfs2_refcount_rec *ret_rec,
880 int *index)
881 {
882 int i = 0;
883 struct ocfs2_refcount_block *rb =
884 (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
885 struct ocfs2_refcount_rec *rec = NULL;
886
887 for (; i < le16_to_cpu(rb->rf_records.rl_used); i++) {
888 rec = &rb->rf_records.rl_recs[i];
889
890 if (le64_to_cpu(rec->r_cpos) +
891 le32_to_cpu(rec->r_clusters) <= cpos)
892 continue;
893 else if (le64_to_cpu(rec->r_cpos) > cpos)
894 break;
895
896 /* ok, cpos fail in this rec. Just return. */
897 if (ret_rec)
898 *ret_rec = *rec;
899 goto out;
900 }
901
902 if (ret_rec) {
903 /* We meet with a hole here, so fake the rec. */
904 ret_rec->r_cpos = cpu_to_le64(cpos);
905 ret_rec->r_refcount = 0;
906 if (i < le16_to_cpu(rb->rf_records.rl_used) &&
907 le64_to_cpu(rec->r_cpos) < cpos + len)
908 ret_rec->r_clusters =
909 cpu_to_le32(le64_to_cpu(rec->r_cpos) - cpos);
910 else
911 ret_rec->r_clusters = cpu_to_le32(len);
912 }
913
914 out:
915 *index = i;
916 }
917
918 /*
919 * Try to remove refcount tree. The mechanism is:
920 * 1) Check whether i_clusters == 0, if no, exit.
921 * 2) check whether we have i_xattr_loc in dinode. if yes, exit.
922 * 3) Check whether we have inline xattr stored outside, if yes, exit.
923 * 4) Remove the tree.
924 */
925 int ocfs2_try_remove_refcount_tree(struct inode *inode,
926 struct buffer_head *di_bh)
927 {
928 int ret;
929 struct ocfs2_inode_info *oi = OCFS2_I(inode);
930 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
931
932 down_write(&oi->ip_xattr_sem);
933 down_write(&oi->ip_alloc_sem);
934
935 if (oi->ip_clusters)
936 goto out;
937
938 if ((oi->ip_dyn_features & OCFS2_HAS_XATTR_FL) && di->i_xattr_loc)
939 goto out;
940
941 if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL &&
942 ocfs2_has_inline_xattr_value_outside(inode, di))
943 goto out;
944
945 ret = ocfs2_remove_refcount_tree(inode, di_bh);
946 if (ret)
947 mlog_errno(ret);
948 out:
949 up_write(&oi->ip_alloc_sem);
950 up_write(&oi->ip_xattr_sem);
951 return 0;
952 }
953
954 /*
955 * Find the end range for a leaf refcount block indicated by
956 * el->l_recs[index].e_blkno.
957 */
958 static int ocfs2_get_refcount_cpos_end(struct ocfs2_caching_info *ci,
959 struct buffer_head *ref_root_bh,
960 struct ocfs2_extent_block *eb,
961 struct ocfs2_extent_list *el,
962 int index, u32 *cpos_end)
963 {
964 int ret, i, subtree_root;
965 u32 cpos;
966 u64 blkno;
967 struct super_block *sb = ocfs2_metadata_cache_get_super(ci);
968 struct ocfs2_path *left_path = NULL, *right_path = NULL;
969 struct ocfs2_extent_tree et;
970 struct ocfs2_extent_list *tmp_el;
971
972 if (index < le16_to_cpu(el->l_next_free_rec) - 1) {
973 /*
974 * We have a extent rec after index, so just use the e_cpos
975 * of the next extent rec.
976 */
977 *cpos_end = le32_to_cpu(el->l_recs[index+1].e_cpos);
978 return 0;
979 }
980
981 if (!eb || (eb && !eb->h_next_leaf_blk)) {
982 /*
983 * We are the last extent rec, so any high cpos should
984 * be stored in this leaf refcount block.
985 */
986 *cpos_end = UINT_MAX;
987 return 0;
988 }
989
990 /*
991 * If the extent block isn't the last one, we have to find
992 * the subtree root between this extent block and the next
993 * leaf extent block and get the corresponding e_cpos from
994 * the subroot. Otherwise we may corrupt the b-tree.
995 */
996 ocfs2_init_refcount_extent_tree(&et, ci, ref_root_bh);
997
998 left_path = ocfs2_new_path_from_et(&et);
999 if (!left_path) {
1000 ret = -ENOMEM;
1001 mlog_errno(ret);
1002 goto out;
1003 }
1004
1005 cpos = le32_to_cpu(eb->h_list.l_recs[index].e_cpos);
1006 ret = ocfs2_find_path(ci, left_path, cpos);
1007 if (ret) {
1008 mlog_errno(ret);
1009 goto out;
1010 }
1011
1012 right_path = ocfs2_new_path_from_path(left_path);
1013 if (!right_path) {
1014 ret = -ENOMEM;
1015 mlog_errno(ret);
1016 goto out;
1017 }
1018
1019 ret = ocfs2_find_cpos_for_right_leaf(sb, left_path, &cpos);
1020 if (ret) {
1021 mlog_errno(ret);
1022 goto out;
1023 }
1024
1025 ret = ocfs2_find_path(ci, right_path, cpos);
1026 if (ret) {
1027 mlog_errno(ret);
1028 goto out;
1029 }
1030
1031 subtree_root = ocfs2_find_subtree_root(&et, left_path,
1032 right_path);
1033
1034 tmp_el = left_path->p_node[subtree_root].el;
1035 blkno = left_path->p_node[subtree_root+1].bh->b_blocknr;
1036 for (i = 0; i < le32_to_cpu(tmp_el->l_next_free_rec); i++) {
1037 if (le64_to_cpu(tmp_el->l_recs[i].e_blkno) == blkno) {
1038 *cpos_end = le32_to_cpu(tmp_el->l_recs[i+1].e_cpos);
1039 break;
1040 }
1041 }
1042
1043 BUG_ON(i == le32_to_cpu(tmp_el->l_next_free_rec));
1044
1045 out:
1046 ocfs2_free_path(left_path);
1047 ocfs2_free_path(right_path);
1048 return ret;
1049 }
1050
1051 /*
1052 * Given a cpos and len, try to find the refcount record which contains cpos.
1053 * 1. If cpos can be found in one refcount record, return the record.
1054 * 2. If cpos can't be found, return a fake record which start from cpos
1055 * and end at a small value between cpos+len and start of the next record.
1056 * This fake record has r_refcount = 0.
1057 */
1058 static int ocfs2_get_refcount_rec(struct ocfs2_caching_info *ci,
1059 struct buffer_head *ref_root_bh,
1060 u64 cpos, unsigned int len,
1061 struct ocfs2_refcount_rec *ret_rec,
1062 int *index,
1063 struct buffer_head **ret_bh)
1064 {
1065 int ret = 0, i, found;
1066 u32 low_cpos, uninitialized_var(cpos_end);
1067 struct ocfs2_extent_list *el;
1068 struct ocfs2_extent_rec *rec = NULL;
1069 struct ocfs2_extent_block *eb = NULL;
1070 struct buffer_head *eb_bh = NULL, *ref_leaf_bh = NULL;
1071 struct super_block *sb = ocfs2_metadata_cache_get_super(ci);
1072 struct ocfs2_refcount_block *rb =
1073 (struct ocfs2_refcount_block *)ref_root_bh->b_data;
1074
1075 if (!(le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL)) {
1076 ocfs2_find_refcount_rec_in_rl(ci, ref_root_bh, cpos, len,
1077 ret_rec, index);
1078 *ret_bh = ref_root_bh;
1079 get_bh(ref_root_bh);
1080 return 0;
1081 }
1082
1083 el = &rb->rf_list;
1084 low_cpos = cpos & OCFS2_32BIT_POS_MASK;
1085
1086 if (el->l_tree_depth) {
1087 ret = ocfs2_find_leaf(ci, el, low_cpos, &eb_bh);
1088 if (ret) {
1089 mlog_errno(ret);
1090 goto out;
1091 }
1092
1093 eb = (struct ocfs2_extent_block *) eb_bh->b_data;
1094 el = &eb->h_list;
1095
1096 if (el->l_tree_depth) {
1097 ocfs2_error(sb,
1098 "refcount tree %llu has non zero tree "
1099 "depth in leaf btree tree block %llu\n",
1100 (unsigned long long)ocfs2_metadata_cache_owner(ci),
1101 (unsigned long long)eb_bh->b_blocknr);
1102 ret = -EROFS;
1103 goto out;
1104 }
1105 }
1106
1107 found = 0;
1108 for (i = le16_to_cpu(el->l_next_free_rec) - 1; i >= 0; i--) {
1109 rec = &el->l_recs[i];
1110
1111 if (le32_to_cpu(rec->e_cpos) <= low_cpos) {
1112 found = 1;
1113 break;
1114 }
1115 }
1116
1117 if (found) {
1118 ret = ocfs2_get_refcount_cpos_end(ci, ref_root_bh,
1119 eb, el, i, &cpos_end);
1120 if (ret) {
1121 mlog_errno(ret);
1122 goto out;
1123 }
1124
1125 if (cpos_end < low_cpos + len)
1126 len = cpos_end - low_cpos;
1127 }
1128
1129 ret = ocfs2_read_refcount_block(ci, le64_to_cpu(rec->e_blkno),
1130 &ref_leaf_bh);
1131 if (ret) {
1132 mlog_errno(ret);
1133 goto out;
1134 }
1135
1136 ocfs2_find_refcount_rec_in_rl(ci, ref_leaf_bh, cpos, len,
1137 ret_rec, index);
1138 *ret_bh = ref_leaf_bh;
1139 out:
1140 brelse(eb_bh);
1141 return ret;
1142 }
1143
1144 enum ocfs2_ref_rec_contig {
1145 REF_CONTIG_NONE = 0,
1146 REF_CONTIG_LEFT,
1147 REF_CONTIG_RIGHT,
1148 REF_CONTIG_LEFTRIGHT,
1149 };
1150
1151 static enum ocfs2_ref_rec_contig
1152 ocfs2_refcount_rec_adjacent(struct ocfs2_refcount_block *rb,
1153 int index)
1154 {
1155 if ((rb->rf_records.rl_recs[index].r_refcount ==
1156 rb->rf_records.rl_recs[index + 1].r_refcount) &&
1157 (le64_to_cpu(rb->rf_records.rl_recs[index].r_cpos) +
1158 le32_to_cpu(rb->rf_records.rl_recs[index].r_clusters) ==
1159 le64_to_cpu(rb->rf_records.rl_recs[index + 1].r_cpos)))
1160 return REF_CONTIG_RIGHT;
1161
1162 return REF_CONTIG_NONE;
1163 }
1164
1165 static enum ocfs2_ref_rec_contig
1166 ocfs2_refcount_rec_contig(struct ocfs2_refcount_block *rb,
1167 int index)
1168 {
1169 enum ocfs2_ref_rec_contig ret = REF_CONTIG_NONE;
1170
1171 if (index < le16_to_cpu(rb->rf_records.rl_used) - 1)
1172 ret = ocfs2_refcount_rec_adjacent(rb, index);
1173
1174 if (index > 0) {
1175 enum ocfs2_ref_rec_contig tmp;
1176
1177 tmp = ocfs2_refcount_rec_adjacent(rb, index - 1);
1178
1179 if (tmp == REF_CONTIG_RIGHT) {
1180 if (ret == REF_CONTIG_RIGHT)
1181 ret = REF_CONTIG_LEFTRIGHT;
1182 else
1183 ret = REF_CONTIG_LEFT;
1184 }
1185 }
1186
1187 return ret;
1188 }
1189
1190 static void ocfs2_rotate_refcount_rec_left(struct ocfs2_refcount_block *rb,
1191 int index)
1192 {
1193 BUG_ON(rb->rf_records.rl_recs[index].r_refcount !=
1194 rb->rf_records.rl_recs[index+1].r_refcount);
1195
1196 le32_add_cpu(&rb->rf_records.rl_recs[index].r_clusters,
1197 le32_to_cpu(rb->rf_records.rl_recs[index+1].r_clusters));
1198
1199 if (index < le16_to_cpu(rb->rf_records.rl_used) - 2)
1200 memmove(&rb->rf_records.rl_recs[index + 1],
1201 &rb->rf_records.rl_recs[index + 2],
1202 sizeof(struct ocfs2_refcount_rec) *
1203 (le16_to_cpu(rb->rf_records.rl_used) - index - 2));
1204
1205 memset(&rb->rf_records.rl_recs[le16_to_cpu(rb->rf_records.rl_used) - 1],
1206 0, sizeof(struct ocfs2_refcount_rec));
1207 le16_add_cpu(&rb->rf_records.rl_used, -1);
1208 }
1209
1210 /*
1211 * Merge the refcount rec if we are contiguous with the adjacent recs.
1212 */
1213 static void ocfs2_refcount_rec_merge(struct ocfs2_refcount_block *rb,
1214 int index)
1215 {
1216 enum ocfs2_ref_rec_contig contig =
1217 ocfs2_refcount_rec_contig(rb, index);
1218
1219 if (contig == REF_CONTIG_NONE)
1220 return;
1221
1222 if (contig == REF_CONTIG_LEFT || contig == REF_CONTIG_LEFTRIGHT) {
1223 BUG_ON(index == 0);
1224 index--;
1225 }
1226
1227 ocfs2_rotate_refcount_rec_left(rb, index);
1228
1229 if (contig == REF_CONTIG_LEFTRIGHT)
1230 ocfs2_rotate_refcount_rec_left(rb, index);
1231 }
1232
1233 /*
1234 * Change the refcount indexed by "index" in ref_bh.
1235 * If refcount reaches 0, remove it.
1236 */
1237 static int ocfs2_change_refcount_rec(handle_t *handle,
1238 struct ocfs2_caching_info *ci,
1239 struct buffer_head *ref_leaf_bh,
1240 int index, int merge, int change)
1241 {
1242 int ret;
1243 struct ocfs2_refcount_block *rb =
1244 (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
1245 struct ocfs2_refcount_list *rl = &rb->rf_records;
1246 struct ocfs2_refcount_rec *rec = &rl->rl_recs[index];
1247
1248 ret = ocfs2_journal_access_rb(handle, ci, ref_leaf_bh,
1249 OCFS2_JOURNAL_ACCESS_WRITE);
1250 if (ret) {
1251 mlog_errno(ret);
1252 goto out;
1253 }
1254
1255 mlog(0, "change index %d, old count %u, change %d\n", index,
1256 le32_to_cpu(rec->r_refcount), change);
1257 le32_add_cpu(&rec->r_refcount, change);
1258
1259 if (!rec->r_refcount) {
1260 if (index != le16_to_cpu(rl->rl_used) - 1) {
1261 memmove(rec, rec + 1,
1262 (le16_to_cpu(rl->rl_used) - index - 1) *
1263 sizeof(struct ocfs2_refcount_rec));
1264 memset(&rl->rl_recs[le16_to_cpu(rl->rl_used) - 1],
1265 0, sizeof(struct ocfs2_refcount_rec));
1266 }
1267
1268 le16_add_cpu(&rl->rl_used, -1);
1269 } else if (merge)
1270 ocfs2_refcount_rec_merge(rb, index);
1271
1272 ret = ocfs2_journal_dirty(handle, ref_leaf_bh);
1273 if (ret)
1274 mlog_errno(ret);
1275 out:
1276 return ret;
1277 }
1278
1279 static int ocfs2_expand_inline_ref_root(handle_t *handle,
1280 struct ocfs2_caching_info *ci,
1281 struct buffer_head *ref_root_bh,
1282 struct buffer_head **ref_leaf_bh,
1283 struct ocfs2_alloc_context *meta_ac)
1284 {
1285 int ret;
1286 u16 suballoc_bit_start;
1287 u32 num_got;
1288 u64 blkno;
1289 struct super_block *sb = ocfs2_metadata_cache_get_super(ci);
1290 struct buffer_head *new_bh = NULL;
1291 struct ocfs2_refcount_block *new_rb;
1292 struct ocfs2_refcount_block *root_rb =
1293 (struct ocfs2_refcount_block *)ref_root_bh->b_data;
1294
1295 ret = ocfs2_journal_access_rb(handle, ci, ref_root_bh,
1296 OCFS2_JOURNAL_ACCESS_WRITE);
1297 if (ret) {
1298 mlog_errno(ret);
1299 goto out;
1300 }
1301
1302 ret = ocfs2_claim_metadata(OCFS2_SB(sb), handle, meta_ac, 1,
1303 &suballoc_bit_start, &num_got,
1304 &blkno);
1305 if (ret) {
1306 mlog_errno(ret);
1307 goto out;
1308 }
1309
1310 new_bh = sb_getblk(sb, blkno);
1311 if (new_bh == NULL) {
1312 ret = -EIO;
1313 mlog_errno(ret);
1314 goto out;
1315 }
1316 ocfs2_set_new_buffer_uptodate(ci, new_bh);
1317
1318 ret = ocfs2_journal_access_rb(handle, ci, new_bh,
1319 OCFS2_JOURNAL_ACCESS_CREATE);
1320 if (ret) {
1321 mlog_errno(ret);
1322 goto out;
1323 }
1324
1325 /*
1326 * Initialize ocfs2_refcount_block.
1327 * It should contain the same information as the old root.
1328 * so just memcpy it and change the corresponding field.
1329 */
1330 memcpy(new_bh->b_data, ref_root_bh->b_data, sb->s_blocksize);
1331
1332 new_rb = (struct ocfs2_refcount_block *)new_bh->b_data;
1333 new_rb->rf_suballoc_slot = cpu_to_le16(OCFS2_SB(sb)->slot_num);
1334 new_rb->rf_suballoc_bit = cpu_to_le16(suballoc_bit_start);
1335 new_rb->rf_blkno = cpu_to_le64(blkno);
1336 new_rb->rf_cpos = cpu_to_le32(0);
1337 new_rb->rf_parent = cpu_to_le64(ref_root_bh->b_blocknr);
1338 new_rb->rf_flags = cpu_to_le32(OCFS2_REFCOUNT_LEAF_FL);
1339 ocfs2_journal_dirty(handle, new_bh);
1340
1341 /* Now change the root. */
1342 memset(&root_rb->rf_list, 0, sb->s_blocksize -
1343 offsetof(struct ocfs2_refcount_block, rf_list));
1344 root_rb->rf_list.l_count = cpu_to_le16(ocfs2_extent_recs_per_rb(sb));
1345 root_rb->rf_clusters = cpu_to_le32(1);
1346 root_rb->rf_list.l_next_free_rec = cpu_to_le16(1);
1347 root_rb->rf_list.l_recs[0].e_blkno = cpu_to_le64(blkno);
1348 root_rb->rf_list.l_recs[0].e_leaf_clusters = cpu_to_le16(1);
1349 root_rb->rf_flags = cpu_to_le32(OCFS2_REFCOUNT_TREE_FL);
1350
1351 ocfs2_journal_dirty(handle, ref_root_bh);
1352
1353 mlog(0, "new leaf block %llu, used %u\n", (unsigned long long)blkno,
1354 le16_to_cpu(new_rb->rf_records.rl_used));
1355
1356 *ref_leaf_bh = new_bh;
1357 new_bh = NULL;
1358 out:
1359 brelse(new_bh);
1360 return ret;
1361 }
1362
1363 static int ocfs2_refcount_rec_no_intersect(struct ocfs2_refcount_rec *prev,
1364 struct ocfs2_refcount_rec *next)
1365 {
1366 if (ocfs2_get_ref_rec_low_cpos(prev) + le32_to_cpu(prev->r_clusters) <=
1367 ocfs2_get_ref_rec_low_cpos(next))
1368 return 1;
1369
1370 return 0;
1371 }
1372
1373 static int cmp_refcount_rec_by_low_cpos(const void *a, const void *b)
1374 {
1375 const struct ocfs2_refcount_rec *l = a, *r = b;
1376 u32 l_cpos = ocfs2_get_ref_rec_low_cpos(l);
1377 u32 r_cpos = ocfs2_get_ref_rec_low_cpos(r);
1378
1379 if (l_cpos > r_cpos)
1380 return 1;
1381 if (l_cpos < r_cpos)
1382 return -1;
1383 return 0;
1384 }
1385
1386 static int cmp_refcount_rec_by_cpos(const void *a, const void *b)
1387 {
1388 const struct ocfs2_refcount_rec *l = a, *r = b;
1389 u64 l_cpos = le64_to_cpu(l->r_cpos);
1390 u64 r_cpos = le64_to_cpu(r->r_cpos);
1391
1392 if (l_cpos > r_cpos)
1393 return 1;
1394 if (l_cpos < r_cpos)
1395 return -1;
1396 return 0;
1397 }
1398
1399 static void swap_refcount_rec(void *a, void *b, int size)
1400 {
1401 struct ocfs2_refcount_rec *l = a, *r = b, tmp;
1402
1403 tmp = *(struct ocfs2_refcount_rec *)l;
1404 *(struct ocfs2_refcount_rec *)l =
1405 *(struct ocfs2_refcount_rec *)r;
1406 *(struct ocfs2_refcount_rec *)r = tmp;
1407 }
1408
1409 /*
1410 * The refcount cpos are ordered by their 64bit cpos,
1411 * But we will use the low 32 bit to be the e_cpos in the b-tree.
1412 * So we need to make sure that this pos isn't intersected with others.
1413 *
1414 * Note: The refcount block is already sorted by their low 32 bit cpos,
1415 * So just try the middle pos first, and we will exit when we find
1416 * the good position.
1417 */
1418 static int ocfs2_find_refcount_split_pos(struct ocfs2_refcount_list *rl,
1419 u32 *split_pos, int *split_index)
1420 {
1421 int num_used = le16_to_cpu(rl->rl_used);
1422 int delta, middle = num_used / 2;
1423
1424 for (delta = 0; delta < middle; delta++) {
1425 /* Let's check delta earlier than middle */
1426 if (ocfs2_refcount_rec_no_intersect(
1427 &rl->rl_recs[middle - delta - 1],
1428 &rl->rl_recs[middle - delta])) {
1429 *split_index = middle - delta;
1430 break;
1431 }
1432
1433 /* For even counts, don't walk off the end */
1434 if ((middle + delta + 1) == num_used)
1435 continue;
1436
1437 /* Now try delta past middle */
1438 if (ocfs2_refcount_rec_no_intersect(
1439 &rl->rl_recs[middle + delta],
1440 &rl->rl_recs[middle + delta + 1])) {
1441 *split_index = middle + delta + 1;
1442 break;
1443 }
1444 }
1445
1446 if (delta >= middle)
1447 return -ENOSPC;
1448
1449 *split_pos = ocfs2_get_ref_rec_low_cpos(&rl->rl_recs[*split_index]);
1450 return 0;
1451 }
1452
1453 static int ocfs2_divide_leaf_refcount_block(struct buffer_head *ref_leaf_bh,
1454 struct buffer_head *new_bh,
1455 u32 *split_cpos)
1456 {
1457 int split_index = 0, num_moved, ret;
1458 u32 cpos = 0;
1459 struct ocfs2_refcount_block *rb =
1460 (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
1461 struct ocfs2_refcount_list *rl = &rb->rf_records;
1462 struct ocfs2_refcount_block *new_rb =
1463 (struct ocfs2_refcount_block *)new_bh->b_data;
1464 struct ocfs2_refcount_list *new_rl = &new_rb->rf_records;
1465
1466 mlog(0, "split old leaf refcount block %llu, count = %u, used = %u\n",
1467 (unsigned long long)ref_leaf_bh->b_blocknr,
1468 le32_to_cpu(rl->rl_count), le32_to_cpu(rl->rl_used));
1469
1470 /*
1471 * XXX: Improvement later.
1472 * If we know all the high 32 bit cpos is the same, no need to sort.
1473 *
1474 * In order to make the whole process safe, we do:
1475 * 1. sort the entries by their low 32 bit cpos first so that we can
1476 * find the split cpos easily.
1477 * 2. call ocfs2_insert_extent to insert the new refcount block.
1478 * 3. move the refcount rec to the new block.
1479 * 4. sort the entries by their 64 bit cpos.
1480 * 5. dirty the new_rb and rb.
1481 */
1482 sort(&rl->rl_recs, le16_to_cpu(rl->rl_used),
1483 sizeof(struct ocfs2_refcount_rec),
1484 cmp_refcount_rec_by_low_cpos, swap_refcount_rec);
1485
1486 ret = ocfs2_find_refcount_split_pos(rl, &cpos, &split_index);
1487 if (ret) {
1488 mlog_errno(ret);
1489 return ret;
1490 }
1491
1492 new_rb->rf_cpos = cpu_to_le32(cpos);
1493
1494 /* move refcount records starting from split_index to the new block. */
1495 num_moved = le16_to_cpu(rl->rl_used) - split_index;
1496 memcpy(new_rl->rl_recs, &rl->rl_recs[split_index],
1497 num_moved * sizeof(struct ocfs2_refcount_rec));
1498
1499 /*ok, remove the entries we just moved over to the other block. */
1500 memset(&rl->rl_recs[split_index], 0,
1501 num_moved * sizeof(struct ocfs2_refcount_rec));
1502
1503 /* change old and new rl_used accordingly. */
1504 le16_add_cpu(&rl->rl_used, -num_moved);
1505 new_rl->rl_used = cpu_to_le16(num_moved);
1506
1507 sort(&rl->rl_recs, le16_to_cpu(rl->rl_used),
1508 sizeof(struct ocfs2_refcount_rec),
1509 cmp_refcount_rec_by_cpos, swap_refcount_rec);
1510
1511 sort(&new_rl->rl_recs, le16_to_cpu(new_rl->rl_used),
1512 sizeof(struct ocfs2_refcount_rec),
1513 cmp_refcount_rec_by_cpos, swap_refcount_rec);
1514
1515 *split_cpos = cpos;
1516 return 0;
1517 }
1518
1519 static int ocfs2_new_leaf_refcount_block(handle_t *handle,
1520 struct ocfs2_caching_info *ci,
1521 struct buffer_head *ref_root_bh,
1522 struct buffer_head *ref_leaf_bh,
1523 struct ocfs2_alloc_context *meta_ac)
1524 {
1525 int ret;
1526 u16 suballoc_bit_start;
1527 u32 num_got, new_cpos;
1528 u64 blkno;
1529 struct super_block *sb = ocfs2_metadata_cache_get_super(ci);
1530 struct ocfs2_refcount_block *root_rb =
1531 (struct ocfs2_refcount_block *)ref_root_bh->b_data;
1532 struct buffer_head *new_bh = NULL;
1533 struct ocfs2_refcount_block *new_rb;
1534 struct ocfs2_extent_tree ref_et;
1535
1536 BUG_ON(!(le32_to_cpu(root_rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL));
1537
1538 ret = ocfs2_journal_access_rb(handle, ci, ref_root_bh,
1539 OCFS2_JOURNAL_ACCESS_WRITE);
1540 if (ret) {
1541 mlog_errno(ret);
1542 goto out;
1543 }
1544
1545 ret = ocfs2_journal_access_rb(handle, ci, ref_leaf_bh,
1546 OCFS2_JOURNAL_ACCESS_WRITE);
1547 if (ret) {
1548 mlog_errno(ret);
1549 goto out;
1550 }
1551
1552 ret = ocfs2_claim_metadata(OCFS2_SB(sb), handle, meta_ac, 1,
1553 &suballoc_bit_start, &num_got,
1554 &blkno);
1555 if (ret) {
1556 mlog_errno(ret);
1557 goto out;
1558 }
1559
1560 new_bh = sb_getblk(sb, blkno);
1561 if (new_bh == NULL) {
1562 ret = -EIO;
1563 mlog_errno(ret);
1564 goto out;
1565 }
1566 ocfs2_set_new_buffer_uptodate(ci, new_bh);
1567
1568 ret = ocfs2_journal_access_rb(handle, ci, new_bh,
1569 OCFS2_JOURNAL_ACCESS_CREATE);
1570 if (ret) {
1571 mlog_errno(ret);
1572 goto out;
1573 }
1574
1575 /* Initialize ocfs2_refcount_block. */
1576 new_rb = (struct ocfs2_refcount_block *)new_bh->b_data;
1577 memset(new_rb, 0, sb->s_blocksize);
1578 strcpy((void *)new_rb, OCFS2_REFCOUNT_BLOCK_SIGNATURE);
1579 new_rb->rf_suballoc_slot = cpu_to_le16(OCFS2_SB(sb)->slot_num);
1580 new_rb->rf_suballoc_bit = cpu_to_le16(suballoc_bit_start);
1581 new_rb->rf_fs_generation = cpu_to_le32(OCFS2_SB(sb)->fs_generation);
1582 new_rb->rf_blkno = cpu_to_le64(blkno);
1583 new_rb->rf_parent = cpu_to_le64(ref_root_bh->b_blocknr);
1584 new_rb->rf_flags = cpu_to_le32(OCFS2_REFCOUNT_LEAF_FL);
1585 new_rb->rf_records.rl_count =
1586 cpu_to_le16(ocfs2_refcount_recs_per_rb(sb));
1587 new_rb->rf_generation = root_rb->rf_generation;
1588
1589 ret = ocfs2_divide_leaf_refcount_block(ref_leaf_bh, new_bh, &new_cpos);
1590 if (ret) {
1591 mlog_errno(ret);
1592 goto out;
1593 }
1594
1595 ocfs2_journal_dirty(handle, ref_leaf_bh);
1596 ocfs2_journal_dirty(handle, new_bh);
1597
1598 ocfs2_init_refcount_extent_tree(&ref_et, ci, ref_root_bh);
1599
1600 mlog(0, "insert new leaf block %llu at %u\n",
1601 (unsigned long long)new_bh->b_blocknr, new_cpos);
1602
1603 /* Insert the new leaf block with the specific offset cpos. */
1604 ret = ocfs2_insert_extent(handle, &ref_et, new_cpos, new_bh->b_blocknr,
1605 1, 0, meta_ac);
1606 if (ret)
1607 mlog_errno(ret);
1608
1609 out:
1610 brelse(new_bh);
1611 return ret;
1612 }
1613
1614 static int ocfs2_expand_refcount_tree(handle_t *handle,
1615 struct ocfs2_caching_info *ci,
1616 struct buffer_head *ref_root_bh,
1617 struct buffer_head *ref_leaf_bh,
1618 struct ocfs2_alloc_context *meta_ac)
1619 {
1620 int ret;
1621 struct buffer_head *expand_bh = NULL;
1622
1623 if (ref_root_bh == ref_leaf_bh) {
1624 /*
1625 * the old root bh hasn't been expanded to a b-tree,
1626 * so expand it first.
1627 */
1628 ret = ocfs2_expand_inline_ref_root(handle, ci, ref_root_bh,
1629 &expand_bh, meta_ac);
1630 if (ret) {
1631 mlog_errno(ret);
1632 goto out;
1633 }
1634 } else {
1635 expand_bh = ref_leaf_bh;
1636 get_bh(expand_bh);
1637 }
1638
1639
1640 /* Now add a new refcount block into the tree.*/
1641 ret = ocfs2_new_leaf_refcount_block(handle, ci, ref_root_bh,
1642 expand_bh, meta_ac);
1643 if (ret)
1644 mlog_errno(ret);
1645 out:
1646 brelse(expand_bh);
1647 return ret;
1648 }
1649
1650 /*
1651 * Adjust the extent rec in b-tree representing ref_leaf_bh.
1652 *
1653 * Only called when we have inserted a new refcount rec at index 0
1654 * which means ocfs2_extent_rec.e_cpos may need some change.
1655 */
1656 static int ocfs2_adjust_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 {
1662 int ret = 0, i;
1663 u32 new_cpos, old_cpos;
1664 struct ocfs2_path *path = NULL;
1665 struct ocfs2_extent_tree et;
1666 struct ocfs2_refcount_block *rb =
1667 (struct ocfs2_refcount_block *)ref_root_bh->b_data;
1668 struct ocfs2_extent_list *el;
1669
1670 if (!(le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL))
1671 goto out;
1672
1673 rb = (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
1674 old_cpos = le32_to_cpu(rb->rf_cpos);
1675 new_cpos = le64_to_cpu(rec->r_cpos) & OCFS2_32BIT_POS_MASK;
1676 if (old_cpos <= new_cpos)
1677 goto out;
1678
1679 ocfs2_init_refcount_extent_tree(&et, ci, ref_root_bh);
1680
1681 path = ocfs2_new_path_from_et(&et);
1682 if (!path) {
1683 ret = -ENOMEM;
1684 mlog_errno(ret);
1685 goto out;
1686 }
1687
1688 ret = ocfs2_find_path(ci, path, old_cpos);
1689 if (ret) {
1690 mlog_errno(ret);
1691 goto out;
1692 }
1693
1694 /*
1695 * 2 more credits, one for the leaf refcount block, one for
1696 * the extent block contains the extent rec.
1697 */
1698 ret = ocfs2_extend_trans(handle, handle->h_buffer_credits + 2);
1699 if (ret < 0) {
1700 mlog_errno(ret);
1701 goto out;
1702 }
1703
1704 ret = ocfs2_journal_access_rb(handle, ci, ref_leaf_bh,
1705 OCFS2_JOURNAL_ACCESS_WRITE);
1706 if (ret < 0) {
1707 mlog_errno(ret);
1708 goto out;
1709 }
1710
1711 ret = ocfs2_journal_access_eb(handle, ci, path_leaf_bh(path),
1712 OCFS2_JOURNAL_ACCESS_WRITE);
1713 if (ret < 0) {
1714 mlog_errno(ret);
1715 goto out;
1716 }
1717
1718 /* change the leaf extent block first. */
1719 el = path_leaf_el(path);
1720
1721 for (i = 0; i < le16_to_cpu(el->l_next_free_rec); i++)
1722 if (le32_to_cpu(el->l_recs[i].e_cpos) == old_cpos)
1723 break;
1724
1725 BUG_ON(i == le16_to_cpu(el->l_next_free_rec));
1726
1727 el->l_recs[i].e_cpos = cpu_to_le32(new_cpos);
1728
1729 /* change the r_cpos in the leaf block. */
1730 rb->rf_cpos = cpu_to_le32(new_cpos);
1731
1732 ocfs2_journal_dirty(handle, path_leaf_bh(path));
1733 ocfs2_journal_dirty(handle, ref_leaf_bh);
1734
1735 out:
1736 ocfs2_free_path(path);
1737 return ret;
1738 }
1739
1740 static int ocfs2_insert_refcount_rec(handle_t *handle,
1741 struct ocfs2_caching_info *ci,
1742 struct buffer_head *ref_root_bh,
1743 struct buffer_head *ref_leaf_bh,
1744 struct ocfs2_refcount_rec *rec,
1745 int index, int merge,
1746 struct ocfs2_alloc_context *meta_ac)
1747 {
1748 int ret;
1749 struct ocfs2_refcount_block *rb =
1750 (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
1751 struct ocfs2_refcount_list *rf_list = &rb->rf_records;
1752 struct buffer_head *new_bh = NULL;
1753
1754 BUG_ON(le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL);
1755
1756 if (rf_list->rl_used == rf_list->rl_count) {
1757 u64 cpos = le64_to_cpu(rec->r_cpos);
1758 u32 len = le32_to_cpu(rec->r_clusters);
1759
1760 ret = ocfs2_expand_refcount_tree(handle, ci, ref_root_bh,
1761 ref_leaf_bh, meta_ac);
1762 if (ret) {
1763 mlog_errno(ret);
1764 goto out;
1765 }
1766
1767 ret = ocfs2_get_refcount_rec(ci, ref_root_bh,
1768 cpos, len, NULL, &index,
1769 &new_bh);
1770 if (ret) {
1771 mlog_errno(ret);
1772 goto out;
1773 }
1774
1775 ref_leaf_bh = new_bh;
1776 rb = (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
1777 rf_list = &rb->rf_records;
1778 }
1779
1780 ret = ocfs2_journal_access_rb(handle, ci, ref_leaf_bh,
1781 OCFS2_JOURNAL_ACCESS_WRITE);
1782 if (ret) {
1783 mlog_errno(ret);
1784 goto out;
1785 }
1786
1787 if (index < le16_to_cpu(rf_list->rl_used))
1788 memmove(&rf_list->rl_recs[index + 1],
1789 &rf_list->rl_recs[index],
1790 (le16_to_cpu(rf_list->rl_used) - index) *
1791 sizeof(struct ocfs2_refcount_rec));
1792
1793 mlog(0, "insert refcount record start %llu, len %u, count %u "
1794 "to leaf block %llu at index %d\n",
1795 (unsigned long long)le64_to_cpu(rec->r_cpos),
1796 le32_to_cpu(rec->r_clusters), le32_to_cpu(rec->r_refcount),
1797 (unsigned long long)ref_leaf_bh->b_blocknr, index);
1798
1799 rf_list->rl_recs[index] = *rec;
1800
1801 le16_add_cpu(&rf_list->rl_used, 1);
1802
1803 if (merge)
1804 ocfs2_refcount_rec_merge(rb, index);
1805
1806 ret = ocfs2_journal_dirty(handle, ref_leaf_bh);
1807 if (ret) {
1808 mlog_errno(ret);
1809 goto out;
1810 }
1811
1812 if (index == 0) {
1813 ret = ocfs2_adjust_refcount_rec(handle, ci,
1814 ref_root_bh,
1815 ref_leaf_bh, rec);
1816 if (ret)
1817 mlog_errno(ret);
1818 }
1819 out:
1820 brelse(new_bh);
1821 return ret;
1822 }
1823
1824 /*
1825 * Split the refcount_rec indexed by "index" in ref_leaf_bh.
1826 * This is much simple than our b-tree code.
1827 * split_rec is the new refcount rec we want to insert.
1828 * If split_rec->r_refcount > 0, we are changing the refcount(in case we
1829 * increase refcount or decrease a refcount to non-zero).
1830 * If split_rec->r_refcount == 0, we are punching a hole in current refcount
1831 * rec( in case we decrease a refcount to zero).
1832 */
1833 static int ocfs2_split_refcount_rec(handle_t *handle,
1834 struct ocfs2_caching_info *ci,
1835 struct buffer_head *ref_root_bh,
1836 struct buffer_head *ref_leaf_bh,
1837 struct ocfs2_refcount_rec *split_rec,
1838 int index, int merge,
1839 struct ocfs2_alloc_context *meta_ac,
1840 struct ocfs2_cached_dealloc_ctxt *dealloc)
1841 {
1842 int ret, recs_need;
1843 u32 len;
1844 struct ocfs2_refcount_block *rb =
1845 (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
1846 struct ocfs2_refcount_list *rf_list = &rb->rf_records;
1847 struct ocfs2_refcount_rec *orig_rec = &rf_list->rl_recs[index];
1848 struct ocfs2_refcount_rec *tail_rec = NULL;
1849 struct buffer_head *new_bh = NULL;
1850
1851 BUG_ON(le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL);
1852
1853 mlog(0, "original r_pos %llu, cluster %u, split %llu, cluster %u\n",
1854 le64_to_cpu(orig_rec->r_cpos), le32_to_cpu(orig_rec->r_clusters),
1855 le64_to_cpu(split_rec->r_cpos),
1856 le32_to_cpu(split_rec->r_clusters));
1857
1858 /*
1859 * If we just need to split the header or tail clusters,
1860 * no more recs are needed, just split is OK.
1861 * Otherwise we at least need one new recs.
1862 */
1863 if (!split_rec->r_refcount &&
1864 (split_rec->r_cpos == orig_rec->r_cpos ||
1865 le64_to_cpu(split_rec->r_cpos) +
1866 le32_to_cpu(split_rec->r_clusters) ==
1867 le64_to_cpu(orig_rec->r_cpos) + le32_to_cpu(orig_rec->r_clusters)))
1868 recs_need = 0;
1869 else
1870 recs_need = 1;
1871
1872 /*
1873 * We need one more rec if we split in the middle and the new rec have
1874 * some refcount in it.
1875 */
1876 if (split_rec->r_refcount &&
1877 (split_rec->r_cpos != orig_rec->r_cpos &&
1878 le64_to_cpu(split_rec->r_cpos) +
1879 le32_to_cpu(split_rec->r_clusters) !=
1880 le64_to_cpu(orig_rec->r_cpos) + le32_to_cpu(orig_rec->r_clusters)))
1881 recs_need++;
1882
1883 /* If the leaf block don't have enough record, expand it. */
1884 if (le16_to_cpu(rf_list->rl_used) + recs_need >
1885 le16_to_cpu(rf_list->rl_count)) {
1886 struct ocfs2_refcount_rec tmp_rec;
1887 u64 cpos = le64_to_cpu(orig_rec->r_cpos);
1888 len = le32_to_cpu(orig_rec->r_clusters);
1889 ret = ocfs2_expand_refcount_tree(handle, ci, ref_root_bh,
1890 ref_leaf_bh, meta_ac);
1891 if (ret) {
1892 mlog_errno(ret);
1893 goto out;
1894 }
1895
1896 /*
1897 * We have to re-get it since now cpos may be moved to
1898 * another leaf block.
1899 */
1900 ret = ocfs2_get_refcount_rec(ci, ref_root_bh,
1901 cpos, len, &tmp_rec, &index,
1902 &new_bh);
1903 if (ret) {
1904 mlog_errno(ret);
1905 goto out;
1906 }
1907
1908 ref_leaf_bh = new_bh;
1909 rb = (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
1910 rf_list = &rb->rf_records;
1911 orig_rec = &rf_list->rl_recs[index];
1912 }
1913
1914 ret = ocfs2_journal_access_rb(handle, ci, ref_leaf_bh,
1915 OCFS2_JOURNAL_ACCESS_WRITE);
1916 if (ret) {
1917 mlog_errno(ret);
1918 goto out;
1919 }
1920
1921 /*
1922 * We have calculated out how many new records we need and store
1923 * in recs_need, so spare enough space first by moving the records
1924 * after "index" to the end.
1925 */
1926 if (index != le16_to_cpu(rf_list->rl_used) - 1)
1927 memmove(&rf_list->rl_recs[index + 1 + recs_need],
1928 &rf_list->rl_recs[index + 1],
1929 (le16_to_cpu(rf_list->rl_used) - index - 1) *
1930 sizeof(struct ocfs2_refcount_rec));
1931
1932 len = (le64_to_cpu(orig_rec->r_cpos) +
1933 le32_to_cpu(orig_rec->r_clusters)) -
1934 (le64_to_cpu(split_rec->r_cpos) +
1935 le32_to_cpu(split_rec->r_clusters));
1936
1937 /*
1938 * If we have "len", the we will split in the tail and move it
1939 * to the end of the space we have just spared.
1940 */
1941 if (len) {
1942 tail_rec = &rf_list->rl_recs[index + recs_need];
1943
1944 memcpy(tail_rec, orig_rec, sizeof(struct ocfs2_refcount_rec));
1945 le64_add_cpu(&tail_rec->r_cpos,
1946 le32_to_cpu(tail_rec->r_clusters) - len);
1947 tail_rec->r_clusters = cpu_to_le32(len);
1948 }
1949
1950 /*
1951 * If the split pos isn't the same as the original one, we need to
1952 * split in the head.
1953 *
1954 * Note: We have the chance that split_rec.r_refcount = 0,
1955 * recs_need = 0 and len > 0, which means we just cut the head from
1956 * the orig_rec and in that case we have done some modification in
1957 * orig_rec above, so the check for r_cpos is faked.
1958 */
1959 if (split_rec->r_cpos != orig_rec->r_cpos && tail_rec != orig_rec) {
1960 len = le64_to_cpu(split_rec->r_cpos) -
1961 le64_to_cpu(orig_rec->r_cpos);
1962 orig_rec->r_clusters = cpu_to_le32(len);
1963 index++;
1964 }
1965
1966 le16_add_cpu(&rf_list->rl_used, recs_need);
1967
1968 if (split_rec->r_refcount) {
1969 rf_list->rl_recs[index] = *split_rec;
1970 mlog(0, "insert refcount record start %llu, len %u, count %u "
1971 "to leaf block %llu at index %d\n",
1972 (unsigned long long)le64_to_cpu(split_rec->r_cpos),
1973 le32_to_cpu(split_rec->r_clusters),
1974 le32_to_cpu(split_rec->r_refcount),
1975 (unsigned long long)ref_leaf_bh->b_blocknr, index);
1976
1977 if (merge)
1978 ocfs2_refcount_rec_merge(rb, index);
1979 }
1980
1981 ret = ocfs2_journal_dirty(handle, ref_leaf_bh);
1982 if (ret)
1983 mlog_errno(ret);
1984
1985 out:
1986 brelse(new_bh);
1987 return ret;
1988 }
1989
1990 static int __ocfs2_increase_refcount(handle_t *handle,
1991 struct ocfs2_caching_info *ci,
1992 struct buffer_head *ref_root_bh,
1993 u64 cpos, u32 len, int merge,
1994 struct ocfs2_alloc_context *meta_ac,
1995 struct ocfs2_cached_dealloc_ctxt *dealloc)
1996 {
1997 int ret = 0, index;
1998 struct buffer_head *ref_leaf_bh = NULL;
1999 struct ocfs2_refcount_rec rec;
2000 unsigned int set_len = 0;
2001
2002 mlog(0, "Tree owner %llu, add refcount start %llu, len %u\n",
2003 (unsigned long long)ocfs2_metadata_cache_owner(ci),
2004 (unsigned long long)cpos, len);
2005
2006 while (len) {
2007 ret = ocfs2_get_refcount_rec(ci, ref_root_bh,
2008 cpos, len, &rec, &index,
2009 &ref_leaf_bh);
2010 if (ret) {
2011 mlog_errno(ret);
2012 goto out;
2013 }
2014
2015 set_len = le32_to_cpu(rec.r_clusters);
2016
2017 /*
2018 * Here we may meet with 3 situations:
2019 *
2020 * 1. If we find an already existing record, and the length
2021 * is the same, cool, we just need to increase the r_refcount
2022 * and it is OK.
2023 * 2. If we find a hole, just insert it with r_refcount = 1.
2024 * 3. If we are in the middle of one extent record, split
2025 * it.
2026 */
2027 if (rec.r_refcount && le64_to_cpu(rec.r_cpos) == cpos &&
2028 set_len <= len) {
2029 mlog(0, "increase refcount rec, start %llu, len %u, "
2030 "count %u\n", (unsigned long long)cpos, set_len,
2031 le32_to_cpu(rec.r_refcount));
2032 ret = ocfs2_change_refcount_rec(handle, ci,
2033 ref_leaf_bh, index,
2034 merge, 1);
2035 if (ret) {
2036 mlog_errno(ret);
2037 goto out;
2038 }
2039 } else if (!rec.r_refcount) {
2040 rec.r_refcount = cpu_to_le32(1);
2041
2042 mlog(0, "insert refcount rec, start %llu, len %u\n",
2043 (unsigned long long)le64_to_cpu(rec.r_cpos),
2044 set_len);
2045 ret = ocfs2_insert_refcount_rec(handle, ci, ref_root_bh,
2046 ref_leaf_bh,
2047 &rec, index,
2048 merge, meta_ac);
2049 if (ret) {
2050 mlog_errno(ret);
2051 goto out;
2052 }
2053 } else {
2054 set_len = min((u64)(cpos + len),
2055 le64_to_cpu(rec.r_cpos) + set_len) - cpos;
2056 rec.r_cpos = cpu_to_le64(cpos);
2057 rec.r_clusters = cpu_to_le32(set_len);
2058 le32_add_cpu(&rec.r_refcount, 1);
2059
2060 mlog(0, "split refcount rec, start %llu, "
2061 "len %u, count %u\n",
2062 (unsigned long long)le64_to_cpu(rec.r_cpos),
2063 set_len, le32_to_cpu(rec.r_refcount));
2064 ret = ocfs2_split_refcount_rec(handle, ci,
2065 ref_root_bh, ref_leaf_bh,
2066 &rec, index, merge,
2067 meta_ac, dealloc);
2068 if (ret) {
2069 mlog_errno(ret);
2070 goto out;
2071 }
2072 }
2073
2074 cpos += set_len;
2075 len -= set_len;
2076 brelse(ref_leaf_bh);
2077 ref_leaf_bh = NULL;
2078 }
2079
2080 out:
2081 brelse(ref_leaf_bh);
2082 return ret;
2083 }
2084
2085 static int ocfs2_remove_refcount_extent(handle_t *handle,
2086 struct ocfs2_caching_info *ci,
2087 struct buffer_head *ref_root_bh,
2088 struct buffer_head *ref_leaf_bh,
2089 struct ocfs2_alloc_context *meta_ac,
2090 struct ocfs2_cached_dealloc_ctxt *dealloc)
2091 {
2092 int ret;
2093 struct super_block *sb = ocfs2_metadata_cache_get_super(ci);
2094 struct ocfs2_refcount_block *rb =
2095 (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
2096 struct ocfs2_extent_tree et;
2097
2098 BUG_ON(rb->rf_records.rl_used);
2099
2100 ocfs2_init_refcount_extent_tree(&et, ci, ref_root_bh);
2101 ret = ocfs2_remove_extent(handle, &et, le32_to_cpu(rb->rf_cpos),
2102 1, meta_ac, dealloc);
2103 if (ret) {
2104 mlog_errno(ret);
2105 goto out;
2106 }
2107
2108 ocfs2_remove_from_cache(ci, ref_leaf_bh);
2109
2110 /*
2111 * add the freed block to the dealloc so that it will be freed
2112 * when we run dealloc.
2113 */
2114 ret = ocfs2_cache_block_dealloc(dealloc, EXTENT_ALLOC_SYSTEM_INODE,
2115 le16_to_cpu(rb->rf_suballoc_slot),
2116 le64_to_cpu(rb->rf_blkno),
2117 le16_to_cpu(rb->rf_suballoc_bit));
2118 if (ret) {
2119 mlog_errno(ret);
2120 goto out;
2121 }
2122
2123 ret = ocfs2_journal_access_rb(handle, ci, ref_root_bh,
2124 OCFS2_JOURNAL_ACCESS_WRITE);
2125 if (ret) {
2126 mlog_errno(ret);
2127 goto out;
2128 }
2129
2130 rb = (struct ocfs2_refcount_block *)ref_root_bh->b_data;
2131
2132 le32_add_cpu(&rb->rf_clusters, -1);
2133
2134 /*
2135 * check whether we need to restore the root refcount block if
2136 * there is no leaf extent block at atll.
2137 */
2138 if (!rb->rf_list.l_next_free_rec) {
2139 BUG_ON(rb->rf_clusters);
2140
2141 mlog(0, "reset refcount tree root %llu to be a record block.\n",
2142 (unsigned long long)ref_root_bh->b_blocknr);
2143
2144 rb->rf_flags = 0;
2145 rb->rf_parent = 0;
2146 rb->rf_cpos = 0;
2147 memset(&rb->rf_records, 0, sb->s_blocksize -
2148 offsetof(struct ocfs2_refcount_block, rf_records));
2149 rb->rf_records.rl_count =
2150 cpu_to_le16(ocfs2_refcount_recs_per_rb(sb));
2151 }
2152
2153 ocfs2_journal_dirty(handle, ref_root_bh);
2154
2155 out:
2156 return ret;
2157 }
2158
2159 int ocfs2_increase_refcount(handle_t *handle,
2160 struct ocfs2_caching_info *ci,
2161 struct buffer_head *ref_root_bh,
2162 u64 cpos, u32 len,
2163 struct ocfs2_alloc_context *meta_ac,
2164 struct ocfs2_cached_dealloc_ctxt *dealloc)
2165 {
2166 return __ocfs2_increase_refcount(handle, ci, ref_root_bh,
2167 cpos, len, 1,
2168 meta_ac, dealloc);
2169 }
2170
2171 static int ocfs2_decrease_refcount_rec(handle_t *handle,
2172 struct ocfs2_caching_info *ci,
2173 struct buffer_head *ref_root_bh,
2174 struct buffer_head *ref_leaf_bh,
2175 int index, u64 cpos, unsigned int len,
2176 struct ocfs2_alloc_context *meta_ac,
2177 struct ocfs2_cached_dealloc_ctxt *dealloc)
2178 {
2179 int ret;
2180 struct ocfs2_refcount_block *rb =
2181 (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
2182 struct ocfs2_refcount_rec *rec = &rb->rf_records.rl_recs[index];
2183
2184 BUG_ON(cpos < le64_to_cpu(rec->r_cpos));
2185 BUG_ON(cpos + len >
2186 le64_to_cpu(rec->r_cpos) + le32_to_cpu(rec->r_clusters));
2187
2188 if (cpos == le64_to_cpu(rec->r_cpos) &&
2189 len == le32_to_cpu(rec->r_clusters))
2190 ret = ocfs2_change_refcount_rec(handle, ci,
2191 ref_leaf_bh, index, 1, -1);
2192 else {
2193 struct ocfs2_refcount_rec split = *rec;
2194 split.r_cpos = cpu_to_le64(cpos);
2195 split.r_clusters = cpu_to_le32(len);
2196
2197 le32_add_cpu(&split.r_refcount, -1);
2198
2199 mlog(0, "split refcount rec, start %llu, "
2200 "len %u, count %u, original start %llu, len %u\n",
2201 (unsigned long long)le64_to_cpu(split.r_cpos),
2202 len, le32_to_cpu(split.r_refcount),
2203 (unsigned long long)le64_to_cpu(rec->r_cpos),
2204 le32_to_cpu(rec->r_clusters));
2205 ret = ocfs2_split_refcount_rec(handle, ci,
2206 ref_root_bh, ref_leaf_bh,
2207 &split, index, 1,
2208 meta_ac, dealloc);
2209 }
2210
2211 if (ret) {
2212 mlog_errno(ret);
2213 goto out;
2214 }
2215
2216 /* Remove the leaf refcount block if it contains no refcount record. */
2217 if (!rb->rf_records.rl_used && ref_leaf_bh != ref_root_bh) {
2218 ret = ocfs2_remove_refcount_extent(handle, ci, ref_root_bh,
2219 ref_leaf_bh, meta_ac,
2220 dealloc);
2221 if (ret)
2222 mlog_errno(ret);
2223 }
2224
2225 out:
2226 return ret;
2227 }
2228
2229 static int __ocfs2_decrease_refcount(handle_t *handle,
2230 struct ocfs2_caching_info *ci,
2231 struct buffer_head *ref_root_bh,
2232 u64 cpos, u32 len,
2233 struct ocfs2_alloc_context *meta_ac,
2234 struct ocfs2_cached_dealloc_ctxt *dealloc,
2235 int delete)
2236 {
2237 int ret = 0, index = 0;
2238 struct ocfs2_refcount_rec rec;
2239 unsigned int r_count = 0, r_len;
2240 struct super_block *sb = ocfs2_metadata_cache_get_super(ci);
2241 struct buffer_head *ref_leaf_bh = NULL;
2242
2243 mlog(0, "Tree owner %llu, decrease refcount start %llu, "
2244 "len %u, delete %u\n",
2245 (unsigned long long)ocfs2_metadata_cache_owner(ci),
2246 (unsigned long long)cpos, len, delete);
2247
2248 while (len) {
2249 ret = ocfs2_get_refcount_rec(ci, ref_root_bh,
2250 cpos, len, &rec, &index,
2251 &ref_leaf_bh);
2252 if (ret) {
2253 mlog_errno(ret);
2254 goto out;
2255 }
2256
2257 r_count = le32_to_cpu(rec.r_refcount);
2258 BUG_ON(r_count == 0);
2259 if (!delete)
2260 BUG_ON(r_count > 1);
2261
2262 r_len = min((u64)(cpos + len), le64_to_cpu(rec.r_cpos) +
2263 le32_to_cpu(rec.r_clusters)) - cpos;
2264
2265 ret = ocfs2_decrease_refcount_rec(handle, ci, ref_root_bh,
2266 ref_leaf_bh, index,
2267 cpos, r_len,
2268 meta_ac, dealloc);
2269 if (ret) {
2270 mlog_errno(ret);
2271 goto out;
2272 }
2273
2274 if (le32_to_cpu(rec.r_refcount) == 1 && delete) {
2275 ret = ocfs2_cache_cluster_dealloc(dealloc,
2276 ocfs2_clusters_to_blocks(sb, cpos),
2277 r_len);
2278 if (ret) {
2279 mlog_errno(ret);
2280 goto out;
2281 }
2282 }
2283
2284 cpos += r_len;
2285 len -= r_len;
2286 brelse(ref_leaf_bh);
2287 ref_leaf_bh = NULL;
2288 }
2289
2290 out:
2291 brelse(ref_leaf_bh);
2292 return ret;
2293 }
2294
2295 /* Caller must hold refcount tree lock. */
2296 int ocfs2_decrease_refcount(struct inode *inode,
2297 handle_t *handle, u32 cpos, u32 len,
2298 struct ocfs2_alloc_context *meta_ac,
2299 struct ocfs2_cached_dealloc_ctxt *dealloc,
2300 int delete)
2301 {
2302 int ret;
2303 u64 ref_blkno;
2304 struct ocfs2_inode_info *oi = OCFS2_I(inode);
2305 struct buffer_head *ref_root_bh = NULL;
2306 struct ocfs2_refcount_tree *tree;
2307
2308 BUG_ON(!(oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL));
2309
2310 ret = ocfs2_get_refcount_block(inode, &ref_blkno);
2311 if (ret) {
2312 mlog_errno(ret);
2313 goto out;
2314 }
2315
2316 ret = ocfs2_get_refcount_tree(OCFS2_SB(inode->i_sb), ref_blkno, &tree);
2317 if (ret) {
2318 mlog_errno(ret);
2319 goto out;
2320 }
2321
2322 ret = ocfs2_read_refcount_block(&tree->rf_ci, tree->rf_blkno,
2323 &ref_root_bh);
2324 if (ret) {
2325 mlog_errno(ret);
2326 goto out;
2327 }
2328
2329 ret = __ocfs2_decrease_refcount(handle, &tree->rf_ci, ref_root_bh,
2330 cpos, len, meta_ac, dealloc, delete);
2331 if (ret)
2332 mlog_errno(ret);
2333 out:
2334 brelse(ref_root_bh);
2335 return ret;
2336 }
2337
2338 /*
2339 * Mark the already-existing extent at cpos as refcounted for len clusters.
2340 * This adds the refcount extent flag.
2341 *
2342 * If the existing extent is larger than the request, initiate a
2343 * split. An attempt will be made at merging with adjacent extents.
2344 *
2345 * The caller is responsible for passing down meta_ac if we'll need it.
2346 */
2347 static int ocfs2_mark_extent_refcounted(struct inode *inode,
2348 struct ocfs2_extent_tree *et,
2349 handle_t *handle, u32 cpos,
2350 u32 len, u32 phys,
2351 struct ocfs2_alloc_context *meta_ac,
2352 struct ocfs2_cached_dealloc_ctxt *dealloc)
2353 {
2354 int ret;
2355
2356 mlog(0, "Inode %lu refcount tree cpos %u, len %u, phys cluster %u\n",
2357 inode->i_ino, cpos, len, phys);
2358
2359 if (!ocfs2_refcount_tree(OCFS2_SB(inode->i_sb))) {
2360 ocfs2_error(inode->i_sb, "Inode %lu want to use refcount "
2361 "tree, but the feature bit is not set in the "
2362 "super block.", inode->i_ino);
2363 ret = -EROFS;
2364 goto out;
2365 }
2366
2367 ret = ocfs2_change_extent_flag(handle, et, cpos,
2368 len, phys, meta_ac, dealloc,
2369 OCFS2_EXT_REFCOUNTED, 0);
2370 if (ret)
2371 mlog_errno(ret);
2372
2373 out:
2374 return ret;
2375 }
2376
2377 /*
2378 * Given some contiguous physical clusters, calculate what we need
2379 * for modifying their refcount.
2380 */
2381 static int ocfs2_calc_refcount_meta_credits(struct super_block *sb,
2382 struct ocfs2_caching_info *ci,
2383 struct buffer_head *ref_root_bh,
2384 u64 start_cpos,
2385 u32 clusters,
2386 int *meta_add,
2387 int *credits)
2388 {
2389 int ret = 0, index, ref_blocks = 0, recs_add = 0;
2390 u64 cpos = start_cpos;
2391 struct ocfs2_refcount_block *rb;
2392 struct ocfs2_refcount_rec rec;
2393 struct buffer_head *ref_leaf_bh = NULL, *prev_bh = NULL;
2394 u32 len;
2395
2396 mlog(0, "start_cpos %llu, clusters %u\n",
2397 (unsigned long long)start_cpos, clusters);
2398 while (clusters) {
2399 ret = ocfs2_get_refcount_rec(ci, ref_root_bh,
2400 cpos, clusters, &rec,
2401 &index, &ref_leaf_bh);
2402 if (ret) {
2403 mlog_errno(ret);
2404 goto out;
2405 }
2406
2407 if (ref_leaf_bh != prev_bh) {
2408 /*
2409 * Now we encounter a new leaf block, so calculate
2410 * whether we need to extend the old leaf.
2411 */
2412 if (prev_bh) {
2413 rb = (struct ocfs2_refcount_block *)
2414 prev_bh->b_data;
2415
2416 if (le64_to_cpu(rb->rf_records.rl_used) +
2417 recs_add >
2418 le16_to_cpu(rb->rf_records.rl_count))
2419 ref_blocks++;
2420 }
2421
2422 recs_add = 0;
2423 *credits += 1;
2424 brelse(prev_bh);
2425 prev_bh = ref_leaf_bh;
2426 get_bh(prev_bh);
2427 }
2428
2429 rb = (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
2430
2431 mlog(0, "recs_add %d,cpos %llu, clusters %u, rec->r_cpos %llu,"
2432 "rec->r_clusters %u, rec->r_refcount %u, index %d\n",
2433 recs_add, (unsigned long long)cpos, clusters,
2434 (unsigned long long)le64_to_cpu(rec.r_cpos),
2435 le32_to_cpu(rec.r_clusters),
2436 le32_to_cpu(rec.r_refcount), index);
2437
2438 len = min((u64)cpos + clusters, le64_to_cpu(rec.r_cpos) +
2439 le32_to_cpu(rec.r_clusters)) - cpos;
2440 /*
2441 * If the refcount rec already exist, cool. We just need
2442 * to check whether there is a split. Otherwise we just need
2443 * to increase the refcount.
2444 * If we will insert one, increases recs_add.
2445 *
2446 * We record all the records which will be inserted to the
2447 * same refcount block, so that we can tell exactly whether
2448 * we need a new refcount block or not.
2449 */
2450 if (rec.r_refcount) {
2451 /* Check whether we need a split at the beginning. */
2452 if (cpos == start_cpos &&
2453 cpos != le64_to_cpu(rec.r_cpos))
2454 recs_add++;
2455
2456 /* Check whether we need a split in the end. */
2457 if (cpos + clusters < le64_to_cpu(rec.r_cpos) +
2458 le32_to_cpu(rec.r_clusters))
2459 recs_add++;
2460 } else
2461 recs_add++;
2462
2463 brelse(ref_leaf_bh);
2464 ref_leaf_bh = NULL;
2465 clusters -= len;
2466 cpos += len;
2467 }
2468
2469 if (prev_bh) {
2470 rb = (struct ocfs2_refcount_block *)prev_bh->b_data;
2471
2472 if (le64_to_cpu(rb->rf_records.rl_used) + recs_add >
2473 le16_to_cpu(rb->rf_records.rl_count))
2474 ref_blocks++;
2475
2476 *credits += 1;
2477 }
2478
2479 if (!ref_blocks)
2480 goto out;
2481
2482 mlog(0, "we need ref_blocks %d\n", ref_blocks);
2483 *meta_add += ref_blocks;
2484 *credits += ref_blocks;
2485
2486 /*
2487 * So we may need ref_blocks to insert into the tree.
2488 * That also means we need to change the b-tree and add that number
2489 * of records since we never merge them.
2490 * We need one more block for expansion since the new created leaf
2491 * block is also full and needs split.
2492 */
2493 rb = (struct ocfs2_refcount_block *)ref_root_bh->b_data;
2494 if (le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL) {
2495 struct ocfs2_extent_tree et;
2496
2497 ocfs2_init_refcount_extent_tree(&et, ci, ref_root_bh);
2498 *meta_add += ocfs2_extend_meta_needed(et.et_root_el);
2499 *credits += ocfs2_calc_extend_credits(sb,
2500 et.et_root_el,
2501 ref_blocks);
2502 } else {
2503 *credits += OCFS2_EXPAND_REFCOUNT_TREE_CREDITS;
2504 *meta_add += 1;
2505 }
2506
2507 out:
2508 brelse(ref_leaf_bh);
2509 brelse(prev_bh);
2510 return ret;
2511 }
2512
2513 /*
2514 * For refcount tree, we will decrease some contiguous clusters
2515 * refcount count, so just go through it to see how many blocks
2516 * we gonna touch and whether we need to create new blocks.
2517 *
2518 * Normally the refcount blocks store these refcount should be
2519 * contiguous also, so that we can get the number easily.
2520 * As for meta_ac, we will at most add split 2 refcount record and
2521 * 2 more refcount block, so just check it in a rough way.
2522 *
2523 * Caller must hold refcount tree lock.
2524 */
2525 int ocfs2_prepare_refcount_change_for_del(struct inode *inode,
2526 struct buffer_head *di_bh,
2527 u64 phys_blkno,
2528 u32 clusters,
2529 int *credits,
2530 struct ocfs2_alloc_context **meta_ac)
2531 {
2532 int ret, ref_blocks = 0;
2533 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
2534 struct ocfs2_inode_info *oi = OCFS2_I(inode);
2535 struct buffer_head *ref_root_bh = NULL;
2536 struct ocfs2_refcount_tree *tree;
2537 u64 start_cpos = ocfs2_blocks_to_clusters(inode->i_sb, phys_blkno);
2538
2539 if (!ocfs2_refcount_tree(OCFS2_SB(inode->i_sb))) {
2540 ocfs2_error(inode->i_sb, "Inode %lu want to use refcount "
2541 "tree, but the feature bit is not set in the "
2542 "super block.", inode->i_ino);
2543 ret = -EROFS;
2544 goto out;
2545 }
2546
2547 BUG_ON(!(oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL));
2548
2549 ret = ocfs2_get_refcount_tree(OCFS2_SB(inode->i_sb),
2550 le64_to_cpu(di->i_refcount_loc), &tree);
2551 if (ret) {
2552 mlog_errno(ret);
2553 goto out;
2554 }
2555
2556 ret = ocfs2_read_refcount_block(&tree->rf_ci,
2557 le64_to_cpu(di->i_refcount_loc),
2558 &ref_root_bh);
2559 if (ret) {
2560 mlog_errno(ret);
2561 goto out;
2562 }
2563
2564 ret = ocfs2_calc_refcount_meta_credits(inode->i_sb,
2565 &tree->rf_ci,
2566 ref_root_bh,
2567 start_cpos, clusters,
2568 &ref_blocks, credits);
2569 if (ret) {
2570 mlog_errno(ret);
2571 goto out;
2572 }
2573
2574 mlog(0, "reserve new metadata %d, credits = %d\n",
2575 ref_blocks, *credits);
2576
2577 if (ref_blocks) {
2578 ret = ocfs2_reserve_new_metadata_blocks(OCFS2_SB(inode->i_sb),
2579 ref_blocks, meta_ac);
2580 if (ret)
2581 mlog_errno(ret);
2582 }
2583
2584 out:
2585 brelse(ref_root_bh);
2586 return ret;
2587 }
2588
2589 #define MAX_CONTIG_BYTES 1048576
2590
2591 static inline unsigned int ocfs2_cow_contig_clusters(struct super_block *sb)
2592 {
2593 return ocfs2_clusters_for_bytes(sb, MAX_CONTIG_BYTES);
2594 }
2595
2596 static inline unsigned int ocfs2_cow_contig_mask(struct super_block *sb)
2597 {
2598 return ~(ocfs2_cow_contig_clusters(sb) - 1);
2599 }
2600
2601 /*
2602 * Given an extent that starts at 'start' and an I/O that starts at 'cpos',
2603 * find an offset (start + (n * contig_clusters)) that is closest to cpos
2604 * while still being less than or equal to it.
2605 *
2606 * The goal is to break the extent at a multiple of contig_clusters.
2607 */
2608 static inline unsigned int ocfs2_cow_align_start(struct super_block *sb,
2609 unsigned int start,
2610 unsigned int cpos)
2611 {
2612 BUG_ON(start > cpos);
2613
2614 return start + ((cpos - start) & ocfs2_cow_contig_mask(sb));
2615 }
2616
2617 /*
2618 * Given a cluster count of len, pad it out so that it is a multiple
2619 * of contig_clusters.
2620 */
2621 static inline unsigned int ocfs2_cow_align_length(struct super_block *sb,
2622 unsigned int len)
2623 {
2624 unsigned int padded =
2625 (len + (ocfs2_cow_contig_clusters(sb) - 1)) &
2626 ocfs2_cow_contig_mask(sb);
2627
2628 /* Did we wrap? */
2629 if (padded < len)
2630 padded = UINT_MAX;
2631
2632 return padded;
2633 }
2634
2635 /*
2636 * Calculate out the start and number of virtual clusters we need to to CoW.
2637 *
2638 * cpos is vitual start cluster position we want to do CoW in a
2639 * file and write_len is the cluster length.
2640 * max_cpos is the place where we want to stop CoW intentionally.
2641 *
2642 * Normal we will start CoW from the beginning of extent record cotaining cpos.
2643 * We try to break up extents on boundaries of MAX_CONTIG_BYTES so that we
2644 * get good I/O from the resulting extent tree.
2645 */
2646 static int ocfs2_refcount_cal_cow_clusters(struct inode *inode,
2647 struct ocfs2_extent_list *el,
2648 u32 cpos,
2649 u32 write_len,
2650 u32 max_cpos,
2651 u32 *cow_start,
2652 u32 *cow_len)
2653 {
2654 int ret = 0;
2655 int tree_height = le16_to_cpu(el->l_tree_depth), i;
2656 struct buffer_head *eb_bh = NULL;
2657 struct ocfs2_extent_block *eb = NULL;
2658 struct ocfs2_extent_rec *rec;
2659 unsigned int want_clusters, rec_end = 0;
2660 int contig_clusters = ocfs2_cow_contig_clusters(inode->i_sb);
2661 int leaf_clusters;
2662
2663 BUG_ON(cpos + write_len > max_cpos);
2664
2665 if (tree_height > 0) {
2666 ret = ocfs2_find_leaf(INODE_CACHE(inode), el, cpos, &eb_bh);
2667 if (ret) {
2668 mlog_errno(ret);
2669 goto out;
2670 }
2671
2672 eb = (struct ocfs2_extent_block *) eb_bh->b_data;
2673 el = &eb->h_list;
2674
2675 if (el->l_tree_depth) {
2676 ocfs2_error(inode->i_sb,
2677 "Inode %lu has non zero tree depth in "
2678 "leaf block %llu\n", inode->i_ino,
2679 (unsigned long long)eb_bh->b_blocknr);
2680 ret = -EROFS;
2681 goto out;
2682 }
2683 }
2684
2685 *cow_len = 0;
2686 for (i = 0; i < le16_to_cpu(el->l_next_free_rec); i++) {
2687 rec = &el->l_recs[i];
2688
2689 if (ocfs2_is_empty_extent(rec)) {
2690 mlog_bug_on_msg(i != 0, "Inode %lu has empty record in "
2691 "index %d\n", inode->i_ino, i);
2692 continue;
2693 }
2694
2695 if (le32_to_cpu(rec->e_cpos) +
2696 le16_to_cpu(rec->e_leaf_clusters) <= cpos)
2697 continue;
2698
2699 if (*cow_len == 0) {
2700 /*
2701 * We should find a refcounted record in the
2702 * first pass.
2703 */
2704 BUG_ON(!(rec->e_flags & OCFS2_EXT_REFCOUNTED));
2705 *cow_start = le32_to_cpu(rec->e_cpos);
2706 }
2707
2708 /*
2709 * If we encounter a hole, a non-refcounted record or
2710 * pass the max_cpos, stop the search.
2711 */
2712 if ((!(rec->e_flags & OCFS2_EXT_REFCOUNTED)) ||
2713 (*cow_len && rec_end != le32_to_cpu(rec->e_cpos)) ||
2714 (max_cpos <= le32_to_cpu(rec->e_cpos)))
2715 break;
2716
2717 leaf_clusters = le16_to_cpu(rec->e_leaf_clusters);
2718 rec_end = le32_to_cpu(rec->e_cpos) + leaf_clusters;
2719 if (rec_end > max_cpos) {
2720 rec_end = max_cpos;
2721 leaf_clusters = rec_end - le32_to_cpu(rec->e_cpos);
2722 }
2723
2724 /*
2725 * How many clusters do we actually need from
2726 * this extent? First we see how many we actually
2727 * need to complete the write. If that's smaller
2728 * than contig_clusters, we try for contig_clusters.
2729 */
2730 if (!*cow_len)
2731 want_clusters = write_len;
2732 else
2733 want_clusters = (cpos + write_len) -
2734 (*cow_start + *cow_len);
2735 if (want_clusters < contig_clusters)
2736 want_clusters = contig_clusters;
2737
2738 /*
2739 * If the write does not cover the whole extent, we
2740 * need to calculate how we're going to split the extent.
2741 * We try to do it on contig_clusters boundaries.
2742 *
2743 * Any extent smaller than contig_clusters will be
2744 * CoWed in its entirety.
2745 */
2746 if (leaf_clusters <= contig_clusters)
2747 *cow_len += leaf_clusters;
2748 else if (*cow_len || (*cow_start == cpos)) {
2749 /*
2750 * This extent needs to be CoW'd from its
2751 * beginning, so all we have to do is compute
2752 * how many clusters to grab. We align
2753 * want_clusters to the edge of contig_clusters
2754 * to get better I/O.
2755 */
2756 want_clusters = ocfs2_cow_align_length(inode->i_sb,
2757 want_clusters);
2758
2759 if (leaf_clusters < want_clusters)
2760 *cow_len += leaf_clusters;
2761 else
2762 *cow_len += want_clusters;
2763 } else if ((*cow_start + contig_clusters) >=
2764 (cpos + write_len)) {
2765 /*
2766 * Breaking off contig_clusters at the front
2767 * of the extent will cover our write. That's
2768 * easy.
2769 */
2770 *cow_len = contig_clusters;
2771 } else if ((rec_end - cpos) <= contig_clusters) {
2772 /*
2773 * Breaking off contig_clusters at the tail of
2774 * this extent will cover cpos.
2775 */
2776 *cow_start = rec_end - contig_clusters;
2777 *cow_len = contig_clusters;
2778 } else if ((rec_end - cpos) <= want_clusters) {
2779 /*
2780 * While we can't fit the entire write in this
2781 * extent, we know that the write goes from cpos
2782 * to the end of the extent. Break that off.
2783 * We try to break it at some multiple of
2784 * contig_clusters from the front of the extent.
2785 * Failing that (ie, cpos is within
2786 * contig_clusters of the front), we'll CoW the
2787 * entire extent.
2788 */
2789 *cow_start = ocfs2_cow_align_start(inode->i_sb,
2790 *cow_start, cpos);
2791 *cow_len = rec_end - *cow_start;
2792 } else {
2793 /*
2794 * Ok, the entire write lives in the middle of
2795 * this extent. Let's try to slice the extent up
2796 * nicely. Optimally, our CoW region starts at
2797 * m*contig_clusters from the beginning of the
2798 * extent and goes for n*contig_clusters,
2799 * covering the entire write.
2800 */
2801 *cow_start = ocfs2_cow_align_start(inode->i_sb,
2802 *cow_start, cpos);
2803
2804 want_clusters = (cpos + write_len) - *cow_start;
2805 want_clusters = ocfs2_cow_align_length(inode->i_sb,
2806 want_clusters);
2807 if (*cow_start + want_clusters <= rec_end)
2808 *cow_len = want_clusters;
2809 else
2810 *cow_len = rec_end - *cow_start;
2811 }
2812
2813 /* Have we covered our entire write yet? */
2814 if ((*cow_start + *cow_len) >= (cpos + write_len))
2815 break;
2816
2817 /*
2818 * If we reach the end of the extent block and don't get enough
2819 * clusters, continue with the next extent block if possible.
2820 */
2821 if (i + 1 == le16_to_cpu(el->l_next_free_rec) &&
2822 eb && eb->h_next_leaf_blk) {
2823 brelse(eb_bh);
2824 eb_bh = NULL;
2825
2826 ret = ocfs2_read_extent_block(INODE_CACHE(inode),
2827 le64_to_cpu(eb->h_next_leaf_blk),
2828 &eb_bh);
2829 if (ret) {
2830 mlog_errno(ret);
2831 goto out;
2832 }
2833
2834 eb = (struct ocfs2_extent_block *) eb_bh->b_data;
2835 el = &eb->h_list;
2836 i = -1;
2837 }
2838 }
2839
2840 out:
2841 brelse(eb_bh);
2842 return ret;
2843 }
2844
2845 /*
2846 * Prepare meta_ac, data_ac and calculate credits when we want to add some
2847 * num_clusters in data_tree "et" and change the refcount for the old
2848 * clusters(starting form p_cluster) in the refcount tree.
2849 *
2850 * Note:
2851 * 1. since we may split the old tree, so we at most will need num_clusters + 2
2852 * more new leaf records.
2853 * 2. In some case, we may not need to reserve new clusters(e.g, reflink), so
2854 * just give data_ac = NULL.
2855 */
2856 static int ocfs2_lock_refcount_allocators(struct super_block *sb,
2857 u32 p_cluster, u32 num_clusters,
2858 struct ocfs2_extent_tree *et,
2859 struct ocfs2_caching_info *ref_ci,
2860 struct buffer_head *ref_root_bh,
2861 struct ocfs2_alloc_context **meta_ac,
2862 struct ocfs2_alloc_context **data_ac,
2863 int *credits)
2864 {
2865 int ret = 0, meta_add = 0;
2866 int num_free_extents = ocfs2_num_free_extents(OCFS2_SB(sb), et);
2867
2868 if (num_free_extents < 0) {
2869 ret = num_free_extents;
2870 mlog_errno(ret);
2871 goto out;
2872 }
2873
2874 if (num_free_extents < num_clusters + 2)
2875 meta_add =
2876 ocfs2_extend_meta_needed(et->et_root_el);
2877
2878 *credits += ocfs2_calc_extend_credits(sb, et->et_root_el,
2879 num_clusters + 2);
2880
2881 ret = ocfs2_calc_refcount_meta_credits(sb, ref_ci, ref_root_bh,
2882 p_cluster, num_clusters,
2883 &meta_add, credits);
2884 if (ret) {
2885 mlog_errno(ret);
2886 goto out;
2887 }
2888
2889 mlog(0, "reserve new metadata %d, clusters %u, credits = %d\n",
2890 meta_add, num_clusters, *credits);
2891 ret = ocfs2_reserve_new_metadata_blocks(OCFS2_SB(sb), meta_add,
2892 meta_ac);
2893 if (ret) {
2894 mlog_errno(ret);
2895 goto out;
2896 }
2897
2898 if (data_ac) {
2899 ret = ocfs2_reserve_clusters(OCFS2_SB(sb), num_clusters,
2900 data_ac);
2901 if (ret)
2902 mlog_errno(ret);
2903 }
2904
2905 out:
2906 if (ret) {
2907 if (*meta_ac) {
2908 ocfs2_free_alloc_context(*meta_ac);
2909 *meta_ac = NULL;
2910 }
2911 }
2912
2913 return ret;
2914 }
2915
2916 static int ocfs2_clear_cow_buffer(handle_t *handle, struct buffer_head *bh)
2917 {
2918 BUG_ON(buffer_dirty(bh));
2919
2920 clear_buffer_mapped(bh);
2921
2922 return 0;
2923 }
2924
2925 static int ocfs2_duplicate_clusters_by_page(handle_t *handle,
2926 struct ocfs2_cow_context *context,
2927 u32 cpos, u32 old_cluster,
2928 u32 new_cluster, u32 new_len)
2929 {
2930 int ret = 0, partial;
2931 struct ocfs2_caching_info *ci = context->data_et.et_ci;
2932 struct super_block *sb = ocfs2_metadata_cache_get_super(ci);
2933 u64 new_block = ocfs2_clusters_to_blocks(sb, new_cluster);
2934 struct page *page;
2935 pgoff_t page_index;
2936 unsigned int from, to;
2937 loff_t offset, end, map_end;
2938 struct address_space *mapping = context->inode->i_mapping;
2939
2940 mlog(0, "old_cluster %u, new %u, len %u at offset %u\n", old_cluster,
2941 new_cluster, new_len, cpos);
2942
2943 offset = ((loff_t)cpos) << OCFS2_SB(sb)->s_clustersize_bits;
2944 end = offset + (new_len << OCFS2_SB(sb)->s_clustersize_bits);
2945
2946 while (offset < end) {
2947 page_index = offset >> PAGE_CACHE_SHIFT;
2948 map_end = (page_index + 1) << PAGE_CACHE_SHIFT;
2949 if (map_end > end)
2950 map_end = end;
2951
2952 /* from, to is the offset within the page. */
2953 from = offset & (PAGE_CACHE_SIZE - 1);
2954 to = PAGE_CACHE_SIZE;
2955 if (map_end & (PAGE_CACHE_SIZE - 1))
2956 to = map_end & (PAGE_CACHE_SIZE - 1);
2957
2958 page = grab_cache_page(mapping, page_index);
2959
2960 /* This page can't be dirtied before we CoW it out. */
2961 BUG_ON(PageDirty(page));
2962
2963 if (!PageUptodate(page)) {
2964 ret = block_read_full_page(page, ocfs2_get_block);
2965 if (ret) {
2966 mlog_errno(ret);
2967 goto unlock;
2968 }
2969 lock_page(page);
2970 }
2971
2972 if (page_has_buffers(page)) {
2973 ret = walk_page_buffers(handle, page_buffers(page),
2974 from, to, &partial,
2975 ocfs2_clear_cow_buffer);
2976 if (ret) {
2977 mlog_errno(ret);
2978 goto unlock;
2979 }
2980 }
2981
2982 ocfs2_map_and_dirty_page(context->inode,
2983 handle, from, to,
2984 page, 0, &new_block);
2985 mark_page_accessed(page);
2986 unlock:
2987 unlock_page(page);
2988 page_cache_release(page);
2989 page = NULL;
2990 offset = map_end;
2991 if (ret)
2992 break;
2993 }
2994
2995 return ret;
2996 }
2997
2998 static int ocfs2_duplicate_clusters_by_jbd(handle_t *handle,
2999 struct ocfs2_cow_context *context,
3000 u32 cpos, u32 old_cluster,
3001 u32 new_cluster, u32 new_len)
3002 {
3003 int ret = 0;
3004 struct super_block *sb = context->inode->i_sb;
3005 struct ocfs2_caching_info *ci = context->data_et.et_ci;
3006 int i, blocks = ocfs2_clusters_to_blocks(sb, new_len);
3007 u64 old_block = ocfs2_clusters_to_blocks(sb, old_cluster);
3008 u64 new_block = ocfs2_clusters_to_blocks(sb, new_cluster);
3009 struct ocfs2_super *osb = OCFS2_SB(sb);
3010 struct buffer_head *old_bh = NULL;
3011 struct buffer_head *new_bh = NULL;
3012
3013 mlog(0, "old_cluster %u, new %u, len %u\n", old_cluster,
3014 new_cluster, new_len);
3015
3016 for (i = 0; i < blocks; i++, old_block++, new_block++) {
3017 new_bh = sb_getblk(osb->sb, new_block);
3018 if (new_bh == NULL) {
3019 ret = -EIO;
3020 mlog_errno(ret);
3021 break;
3022 }
3023
3024 ocfs2_set_new_buffer_uptodate(ci, new_bh);
3025
3026 ret = ocfs2_read_block(ci, old_block, &old_bh, NULL);
3027 if (ret) {
3028 mlog_errno(ret);
3029 break;
3030 }
3031
3032 ret = ocfs2_journal_access(handle, ci, new_bh,
3033 OCFS2_JOURNAL_ACCESS_CREATE);
3034 if (ret) {
3035 mlog_errno(ret);
3036 break;
3037 }
3038
3039 memcpy(new_bh->b_data, old_bh->b_data, sb->s_blocksize);
3040 ret = ocfs2_journal_dirty(handle, new_bh);
3041 if (ret) {
3042 mlog_errno(ret);
3043 break;
3044 }
3045
3046 brelse(new_bh);
3047 brelse(old_bh);
3048 new_bh = NULL;
3049 old_bh = NULL;
3050 }
3051
3052 brelse(new_bh);
3053 brelse(old_bh);
3054 return ret;
3055 }
3056
3057 static int ocfs2_clear_ext_refcount(handle_t *handle,
3058 struct ocfs2_extent_tree *et,
3059 u32 cpos, u32 p_cluster, u32 len,
3060 unsigned int ext_flags,
3061 struct ocfs2_alloc_context *meta_ac,
3062 struct ocfs2_cached_dealloc_ctxt *dealloc)
3063 {
3064 int ret, index;
3065 struct ocfs2_extent_rec replace_rec;
3066 struct ocfs2_path *path = NULL;
3067 struct ocfs2_extent_list *el;
3068 struct super_block *sb = ocfs2_metadata_cache_get_super(et->et_ci);
3069 u64 ino = ocfs2_metadata_cache_owner(et->et_ci);
3070
3071 mlog(0, "inode %llu cpos %u, len %u, p_cluster %u, ext_flags %u\n",
3072 (unsigned long long)ino, cpos, len, p_cluster, ext_flags);
3073
3074 memset(&replace_rec, 0, sizeof(replace_rec));
3075 replace_rec.e_cpos = cpu_to_le32(cpos);
3076 replace_rec.e_leaf_clusters = cpu_to_le16(len);
3077 replace_rec.e_blkno = cpu_to_le64(ocfs2_clusters_to_blocks(sb,
3078 p_cluster));
3079 replace_rec.e_flags = ext_flags;
3080 replace_rec.e_flags &= ~OCFS2_EXT_REFCOUNTED;
3081
3082 path = ocfs2_new_path_from_et(et);
3083 if (!path) {
3084 ret = -ENOMEM;
3085 mlog_errno(ret);
3086 goto out;
3087 }
3088
3089 ret = ocfs2_find_path(et->et_ci, path, cpos);
3090 if (ret) {
3091 mlog_errno(ret);
3092 goto out;
3093 }
3094
3095 el = path_leaf_el(path);
3096
3097 index = ocfs2_search_extent_list(el, cpos);
3098 if (index == -1 || index >= le16_to_cpu(el->l_next_free_rec)) {
3099 ocfs2_error(sb,
3100 "Inode %llu has an extent at cpos %u which can no "
3101 "longer be found.\n",
3102 (unsigned long long)ino, cpos);
3103 ret = -EROFS;
3104 goto out;
3105 }
3106
3107 ret = ocfs2_split_extent(handle, et, path, index,
3108 &replace_rec, meta_ac, dealloc);
3109 if (ret)
3110 mlog_errno(ret);
3111
3112 out:
3113 ocfs2_free_path(path);
3114 return ret;
3115 }
3116
3117 static int ocfs2_replace_clusters(handle_t *handle,
3118 struct ocfs2_cow_context *context,
3119 u32 cpos, u32 old,
3120 u32 new, u32 len,
3121 unsigned int ext_flags)
3122 {
3123 int ret;
3124 struct ocfs2_caching_info *ci = context->data_et.et_ci;
3125 u64 ino = ocfs2_metadata_cache_owner(ci);
3126
3127 mlog(0, "inode %llu, cpos %u, old %u, new %u, len %u, ext_flags %u\n",
3128 (unsigned long long)ino, cpos, old, new, len, ext_flags);
3129
3130 /*If the old clusters is unwritten, no need to duplicate. */
3131 if (!(ext_flags & OCFS2_EXT_UNWRITTEN)) {
3132 ret = context->cow_duplicate_clusters(handle, context, cpos,
3133 old, new, len);
3134 if (ret) {
3135 mlog_errno(ret);
3136 goto out;
3137 }
3138 }
3139
3140 ret = ocfs2_clear_ext_refcount(handle, &context->data_et,
3141 cpos, new, len, ext_flags,
3142 context->meta_ac, &context->dealloc);
3143 if (ret)
3144 mlog_errno(ret);
3145 out:
3146 return ret;
3147 }
3148
3149 static int ocfs2_cow_sync_writeback(struct super_block *sb,
3150 struct ocfs2_cow_context *context,
3151 u32 cpos, u32 num_clusters)
3152 {
3153 int ret = 0;
3154 loff_t offset, end, map_end;
3155 pgoff_t page_index;
3156 struct page *page;
3157
3158 if (ocfs2_should_order_data(context->inode))
3159 return 0;
3160
3161 offset = ((loff_t)cpos) << OCFS2_SB(sb)->s_clustersize_bits;
3162 end = offset + (num_clusters << OCFS2_SB(sb)->s_clustersize_bits);
3163
3164 ret = filemap_fdatawrite_range(context->inode->i_mapping,
3165 offset, end - 1);
3166 if (ret < 0) {
3167 mlog_errno(ret);
3168 return ret;
3169 }
3170
3171 while (offset < end) {
3172 page_index = offset >> PAGE_CACHE_SHIFT;
3173 map_end = (page_index + 1) << PAGE_CACHE_SHIFT;
3174 if (map_end > end)
3175 map_end = end;
3176
3177 page = grab_cache_page(context->inode->i_mapping, page_index);
3178 BUG_ON(!page);
3179
3180 wait_on_page_writeback(page);
3181 if (PageError(page)) {
3182 ret = -EIO;
3183 mlog_errno(ret);
3184 } else
3185 mark_page_accessed(page);
3186
3187 unlock_page(page);
3188 page_cache_release(page);
3189 page = NULL;
3190 offset = map_end;
3191 if (ret)
3192 break;
3193 }
3194
3195 return ret;
3196 }
3197
3198 static int ocfs2_di_get_clusters(struct ocfs2_cow_context *context,
3199 u32 v_cluster, u32 *p_cluster,
3200 u32 *num_clusters,
3201 unsigned int *extent_flags)
3202 {
3203 return ocfs2_get_clusters(context->inode, v_cluster, p_cluster,
3204 num_clusters, extent_flags);
3205 }
3206
3207 static int ocfs2_make_clusters_writable(struct super_block *sb,
3208 struct ocfs2_cow_context *context,
3209 u32 cpos, u32 p_cluster,
3210 u32 num_clusters, unsigned int e_flags)
3211 {
3212 int ret, delete, index, credits = 0;
3213 u32 new_bit, new_len;
3214 unsigned int set_len;
3215 struct ocfs2_super *osb = OCFS2_SB(sb);
3216 handle_t *handle;
3217 struct buffer_head *ref_leaf_bh = NULL;
3218 struct ocfs2_caching_info *ref_ci = &context->ref_tree->rf_ci;
3219 struct ocfs2_refcount_rec rec;
3220
3221 mlog(0, "cpos %u, p_cluster %u, num_clusters %u, e_flags %u\n",
3222 cpos, p_cluster, num_clusters, e_flags);
3223
3224 ret = ocfs2_lock_refcount_allocators(sb, p_cluster, num_clusters,
3225 &context->data_et,
3226 ref_ci,
3227 context->ref_root_bh,
3228 &context->meta_ac,
3229 &context->data_ac, &credits);
3230 if (ret) {
3231 mlog_errno(ret);
3232 return ret;
3233 }
3234
3235 if (context->post_refcount)
3236 credits += context->post_refcount->credits;
3237
3238 credits += context->extra_credits;
3239 handle = ocfs2_start_trans(osb, credits);
3240 if (IS_ERR(handle)) {
3241 ret = PTR_ERR(handle);
3242 mlog_errno(ret);
3243 goto out;
3244 }
3245
3246 while (num_clusters) {
3247 ret = ocfs2_get_refcount_rec(ref_ci, context->ref_root_bh,
3248 p_cluster, num_clusters,
3249 &rec, &index, &ref_leaf_bh);
3250 if (ret) {
3251 mlog_errno(ret);
3252 goto out_commit;
3253 }
3254
3255 BUG_ON(!rec.r_refcount);
3256 set_len = min((u64)p_cluster + num_clusters,
3257 le64_to_cpu(rec.r_cpos) +
3258 le32_to_cpu(rec.r_clusters)) - p_cluster;
3259
3260 /*
3261 * There are many different situation here.
3262 * 1. If refcount == 1, remove the flag and don't COW.
3263 * 2. If refcount > 1, allocate clusters.
3264 * Here we may not allocate r_len once at a time, so continue
3265 * until we reach num_clusters.
3266 */
3267 if (le32_to_cpu(rec.r_refcount) == 1) {
3268 delete = 0;
3269 ret = ocfs2_clear_ext_refcount(handle,
3270 &context->data_et,
3271 cpos, p_cluster,
3272 set_len, e_flags,
3273 context->meta_ac,
3274 &context->dealloc);
3275 if (ret) {
3276 mlog_errno(ret);
3277 goto out_commit;
3278 }
3279 } else {
3280 delete = 1;
3281
3282 ret = __ocfs2_claim_clusters(osb, handle,
3283 context->data_ac,
3284 1, set_len,
3285 &new_bit, &new_len);
3286 if (ret) {
3287 mlog_errno(ret);
3288 goto out_commit;
3289 }
3290
3291 ret = ocfs2_replace_clusters(handle, context,
3292 cpos, p_cluster, new_bit,
3293 new_len, e_flags);
3294 if (ret) {
3295 mlog_errno(ret);
3296 goto out_commit;
3297 }
3298 set_len = new_len;
3299 }
3300
3301 ret = __ocfs2_decrease_refcount(handle, ref_ci,
3302 context->ref_root_bh,
3303 p_cluster, set_len,
3304 context->meta_ac,
3305 &context->dealloc, delete);
3306 if (ret) {
3307 mlog_errno(ret);
3308 goto out_commit;
3309 }
3310
3311 cpos += set_len;
3312 p_cluster += set_len;
3313 num_clusters -= set_len;
3314 brelse(ref_leaf_bh);
3315 ref_leaf_bh = NULL;
3316 }
3317
3318 /* handle any post_cow action. */
3319 if (context->post_refcount && context->post_refcount->func) {
3320 ret = context->post_refcount->func(context->inode, handle,
3321 context->post_refcount->para);
3322 if (ret) {
3323 mlog_errno(ret);
3324 goto out_commit;
3325 }
3326 }
3327
3328 /*
3329 * Here we should write the new page out first if we are
3330 * in write-back mode.
3331 */
3332 if (context->get_clusters == ocfs2_di_get_clusters) {
3333 ret = ocfs2_cow_sync_writeback(sb, context, cpos, num_clusters);
3334 if (ret)
3335 mlog_errno(ret);
3336 }
3337
3338 out_commit:
3339 ocfs2_commit_trans(osb, handle);
3340
3341 out:
3342 if (context->data_ac) {
3343 ocfs2_free_alloc_context(context->data_ac);
3344 context->data_ac = NULL;
3345 }
3346 if (context->meta_ac) {
3347 ocfs2_free_alloc_context(context->meta_ac);
3348 context->meta_ac = NULL;
3349 }
3350 brelse(ref_leaf_bh);
3351
3352 return ret;
3353 }
3354
3355 static int ocfs2_replace_cow(struct ocfs2_cow_context *context)
3356 {
3357 int ret = 0;
3358 struct inode *inode = context->inode;
3359 u32 cow_start = context->cow_start, cow_len = context->cow_len;
3360 u32 p_cluster, num_clusters;
3361 unsigned int ext_flags;
3362 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3363
3364 if (!ocfs2_refcount_tree(OCFS2_SB(inode->i_sb))) {
3365 ocfs2_error(inode->i_sb, "Inode %lu want to use refcount "
3366 "tree, but the feature bit is not set in the "
3367 "super block.", inode->i_ino);
3368 return -EROFS;
3369 }
3370
3371 ocfs2_init_dealloc_ctxt(&context->dealloc);
3372
3373 while (cow_len) {
3374 ret = context->get_clusters(context, cow_start, &p_cluster,
3375 &num_clusters, &ext_flags);
3376 if (ret) {
3377 mlog_errno(ret);
3378 break;
3379 }
3380
3381 BUG_ON(!(ext_flags & OCFS2_EXT_REFCOUNTED));
3382
3383 if (cow_len < num_clusters)
3384 num_clusters = cow_len;
3385
3386 ret = ocfs2_make_clusters_writable(inode->i_sb, context,
3387 cow_start, p_cluster,
3388 num_clusters, ext_flags);
3389 if (ret) {
3390 mlog_errno(ret);
3391 break;
3392 }
3393
3394 cow_len -= num_clusters;
3395 cow_start += num_clusters;
3396 }
3397
3398 if (ocfs2_dealloc_has_cluster(&context->dealloc)) {
3399 ocfs2_schedule_truncate_log_flush(osb, 1);
3400 ocfs2_run_deallocs(osb, &context->dealloc);
3401 }
3402
3403 return ret;
3404 }
3405
3406 /*
3407 * Starting at cpos, try to CoW write_len clusters. Don't CoW
3408 * past max_cpos. This will stop when it runs into a hole or an
3409 * unrefcounted extent.
3410 */
3411 static int ocfs2_refcount_cow_hunk(struct inode *inode,
3412 struct buffer_head *di_bh,
3413 u32 cpos, u32 write_len, u32 max_cpos)
3414 {
3415 int ret;
3416 u32 cow_start = 0, cow_len = 0;
3417 struct ocfs2_inode_info *oi = OCFS2_I(inode);
3418 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3419 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
3420 struct buffer_head *ref_root_bh = NULL;
3421 struct ocfs2_refcount_tree *ref_tree;
3422 struct ocfs2_cow_context *context = NULL;
3423
3424 BUG_ON(!(oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL));
3425
3426 ret = ocfs2_refcount_cal_cow_clusters(inode, &di->id2.i_list,
3427 cpos, write_len, max_cpos,
3428 &cow_start, &cow_len);
3429 if (ret) {
3430 mlog_errno(ret);
3431 goto out;
3432 }
3433
3434 mlog(0, "CoW inode %lu, cpos %u, write_len %u, cow_start %u, "
3435 "cow_len %u\n", inode->i_ino,
3436 cpos, write_len, cow_start, cow_len);
3437
3438 BUG_ON(cow_len == 0);
3439
3440 context = kzalloc(sizeof(struct ocfs2_cow_context), GFP_NOFS);
3441 if (!context) {
3442 ret = -ENOMEM;
3443 mlog_errno(ret);
3444 goto out;
3445 }
3446
3447 ret = ocfs2_lock_refcount_tree(osb, le64_to_cpu(di->i_refcount_loc),
3448 1, &ref_tree, &ref_root_bh);
3449 if (ret) {
3450 mlog_errno(ret);
3451 goto out;
3452 }
3453
3454 context->inode = inode;
3455 context->cow_start = cow_start;
3456 context->cow_len = cow_len;
3457 context->ref_tree = ref_tree;
3458 context->ref_root_bh = ref_root_bh;
3459 context->cow_duplicate_clusters = ocfs2_duplicate_clusters_by_page;
3460 context->get_clusters = ocfs2_di_get_clusters;
3461
3462 ocfs2_init_dinode_extent_tree(&context->data_et,
3463 INODE_CACHE(inode), di_bh);
3464
3465 ret = ocfs2_replace_cow(context);
3466 if (ret)
3467 mlog_errno(ret);
3468
3469 /*
3470 * truncate the extent map here since no matter whether we meet with
3471 * any error during the action, we shouldn't trust cached extent map
3472 * any more.
3473 */
3474 ocfs2_extent_map_trunc(inode, cow_start);
3475
3476 ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
3477 brelse(ref_root_bh);
3478 out:
3479 kfree(context);
3480 return ret;
3481 }
3482
3483 /*
3484 * CoW any and all clusters between cpos and cpos+write_len.
3485 * Don't CoW past max_cpos. If this returns successfully, all
3486 * clusters between cpos and cpos+write_len are safe to modify.
3487 */
3488 int ocfs2_refcount_cow(struct inode *inode,
3489 struct buffer_head *di_bh,
3490 u32 cpos, u32 write_len, u32 max_cpos)
3491 {
3492 int ret = 0;
3493 u32 p_cluster, num_clusters;
3494 unsigned int ext_flags;
3495
3496 while (write_len) {
3497 ret = ocfs2_get_clusters(inode, cpos, &p_cluster,
3498 &num_clusters, &ext_flags);
3499 if (ret) {
3500 mlog_errno(ret);
3501 break;
3502 }
3503
3504 if (write_len < num_clusters)
3505 num_clusters = write_len;
3506
3507 if (ext_flags & OCFS2_EXT_REFCOUNTED) {
3508 ret = ocfs2_refcount_cow_hunk(inode, di_bh, cpos,
3509 num_clusters, max_cpos);
3510 if (ret) {
3511 mlog_errno(ret);
3512 break;
3513 }
3514 }
3515
3516 write_len -= num_clusters;
3517 cpos += num_clusters;
3518 }
3519
3520 return ret;
3521 }
3522
3523 static int ocfs2_xattr_value_get_clusters(struct ocfs2_cow_context *context,
3524 u32 v_cluster, u32 *p_cluster,
3525 u32 *num_clusters,
3526 unsigned int *extent_flags)
3527 {
3528 struct inode *inode = context->inode;
3529 struct ocfs2_xattr_value_root *xv = context->cow_object;
3530
3531 return ocfs2_xattr_get_clusters(inode, v_cluster, p_cluster,
3532 num_clusters, &xv->xr_list,
3533 extent_flags);
3534 }
3535
3536 /*
3537 * Given a xattr value root, calculate the most meta/credits we need for
3538 * refcount tree change if we truncate it to 0.
3539 */
3540 int ocfs2_refcounted_xattr_delete_need(struct inode *inode,
3541 struct ocfs2_caching_info *ref_ci,
3542 struct buffer_head *ref_root_bh,
3543 struct ocfs2_xattr_value_root *xv,
3544 int *meta_add, int *credits)
3545 {
3546 int ret = 0, index, ref_blocks = 0;
3547 u32 p_cluster, num_clusters;
3548 u32 cpos = 0, clusters = le32_to_cpu(xv->xr_clusters);
3549 struct ocfs2_refcount_block *rb;
3550 struct ocfs2_refcount_rec rec;
3551 struct buffer_head *ref_leaf_bh = NULL;
3552
3553 while (cpos < clusters) {
3554 ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster,
3555 &num_clusters, &xv->xr_list,
3556 NULL);
3557 if (ret) {
3558 mlog_errno(ret);
3559 goto out;
3560 }
3561
3562 cpos += num_clusters;
3563
3564 while (num_clusters) {
3565 ret = ocfs2_get_refcount_rec(ref_ci, ref_root_bh,
3566 p_cluster, num_clusters,
3567 &rec, &index,
3568 &ref_leaf_bh);
3569 if (ret) {
3570 mlog_errno(ret);
3571 goto out;
3572 }
3573
3574 BUG_ON(!rec.r_refcount);
3575
3576 rb = (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
3577
3578 /*
3579 * We really don't know whether the other clusters is in
3580 * this refcount block or not, so just take the worst
3581 * case that all the clusters are in this block and each
3582 * one will split a refcount rec, so totally we need
3583 * clusters * 2 new refcount rec.
3584 */
3585 if (le64_to_cpu(rb->rf_records.rl_used) + clusters * 2 >
3586 le16_to_cpu(rb->rf_records.rl_count))
3587 ref_blocks++;
3588
3589 *credits += 1;
3590 brelse(ref_leaf_bh);
3591 ref_leaf_bh = NULL;
3592
3593 if (num_clusters <= le32_to_cpu(rec.r_clusters))
3594 break;
3595 else
3596 num_clusters -= le32_to_cpu(rec.r_clusters);
3597 p_cluster += num_clusters;
3598 }
3599 }
3600
3601 *meta_add += ref_blocks;
3602 if (!ref_blocks)
3603 goto out;
3604
3605 rb = (struct ocfs2_refcount_block *)ref_root_bh->b_data;
3606 if (le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL)
3607 *credits += OCFS2_EXPAND_REFCOUNT_TREE_CREDITS;
3608 else {
3609 struct ocfs2_extent_tree et;
3610
3611 ocfs2_init_refcount_extent_tree(&et, ref_ci, ref_root_bh);
3612 *credits += ocfs2_calc_extend_credits(inode->i_sb,
3613 et.et_root_el,
3614 ref_blocks);
3615 }
3616
3617 out:
3618 brelse(ref_leaf_bh);
3619 return ret;
3620 }
3621
3622 /*
3623 * Do CoW for xattr.
3624 */
3625 int ocfs2_refcount_cow_xattr(struct inode *inode,
3626 struct ocfs2_dinode *di,
3627 struct ocfs2_xattr_value_buf *vb,
3628 struct ocfs2_refcount_tree *ref_tree,
3629 struct buffer_head *ref_root_bh,
3630 u32 cpos, u32 write_len,
3631 struct ocfs2_post_refcount *post)
3632 {
3633 int ret;
3634 struct ocfs2_xattr_value_root *xv = vb->vb_xv;
3635 struct ocfs2_inode_info *oi = OCFS2_I(inode);
3636 struct ocfs2_cow_context *context = NULL;
3637 u32 cow_start, cow_len;
3638
3639 BUG_ON(!(oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL));
3640
3641 ret = ocfs2_refcount_cal_cow_clusters(inode, &xv->xr_list,
3642 cpos, write_len, UINT_MAX,
3643 &cow_start, &cow_len);
3644 if (ret) {
3645 mlog_errno(ret);
3646 goto out;
3647 }
3648
3649 BUG_ON(cow_len == 0);
3650
3651 context = kzalloc(sizeof(struct ocfs2_cow_context), GFP_NOFS);
3652 if (!context) {
3653 ret = -ENOMEM;
3654 mlog_errno(ret);
3655 goto out;
3656 }
3657
3658 context->inode = inode;
3659 context->cow_start = cow_start;
3660 context->cow_len = cow_len;
3661 context->ref_tree = ref_tree;
3662 context->ref_root_bh = ref_root_bh;;
3663 context->cow_object = xv;
3664
3665 context->cow_duplicate_clusters = ocfs2_duplicate_clusters_by_jbd;
3666 /* We need the extra credits for duplicate_clusters by jbd. */
3667 context->extra_credits =
3668 ocfs2_clusters_to_blocks(inode->i_sb, 1) * cow_len;
3669 context->get_clusters = ocfs2_xattr_value_get_clusters;
3670 context->post_refcount = post;
3671
3672 ocfs2_init_xattr_value_extent_tree(&context->data_et,
3673 INODE_CACHE(inode), vb);
3674
3675 ret = ocfs2_replace_cow(context);
3676 if (ret)
3677 mlog_errno(ret);
3678
3679 out:
3680 kfree(context);
3681 return ret;
3682 }
3683
3684 /*
3685 * Insert a new extent into refcount tree and mark a extent rec
3686 * as refcounted in the dinode tree.
3687 */
3688 int ocfs2_add_refcount_flag(struct inode *inode,
3689 struct ocfs2_extent_tree *data_et,
3690 struct ocfs2_caching_info *ref_ci,
3691 struct buffer_head *ref_root_bh,
3692 u32 cpos, u32 p_cluster, u32 num_clusters,
3693 struct ocfs2_cached_dealloc_ctxt *dealloc,
3694 struct ocfs2_post_refcount *post)
3695 {
3696 int ret;
3697 handle_t *handle;
3698 int credits = 1, ref_blocks = 0;
3699 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3700 struct ocfs2_alloc_context *meta_ac = NULL;
3701
3702 ret = ocfs2_calc_refcount_meta_credits(inode->i_sb,
3703 ref_ci, ref_root_bh,
3704 p_cluster, num_clusters,
3705 &ref_blocks, &credits);
3706 if (ret) {
3707 mlog_errno(ret);
3708 goto out;
3709 }
3710
3711 mlog(0, "reserve new metadata %d, credits = %d\n",
3712 ref_blocks, credits);
3713
3714 if (ref_blocks) {
3715 ret = ocfs2_reserve_new_metadata_blocks(OCFS2_SB(inode->i_sb),
3716 ref_blocks, &meta_ac);
3717 if (ret) {
3718 mlog_errno(ret);
3719 goto out;
3720 }
3721 }
3722
3723 if (post)
3724 credits += post->credits;
3725
3726 handle = ocfs2_start_trans(osb, credits);
3727 if (IS_ERR(handle)) {
3728 ret = PTR_ERR(handle);
3729 mlog_errno(ret);
3730 goto out;
3731 }
3732
3733 ret = ocfs2_mark_extent_refcounted(inode, data_et, handle,
3734 cpos, num_clusters, p_cluster,
3735 meta_ac, dealloc);
3736 if (ret) {
3737 mlog_errno(ret);
3738 goto out_commit;
3739 }
3740
3741 ret = __ocfs2_increase_refcount(handle, ref_ci, ref_root_bh,
3742 p_cluster, num_clusters, 0,
3743 meta_ac, dealloc);
3744 if (ret) {
3745 mlog_errno(ret);
3746 goto out_commit;
3747 }
3748
3749 if (post && post->func) {
3750 ret = post->func(inode, handle, post->para);
3751 if (ret)
3752 mlog_errno(ret);
3753 }
3754
3755 out_commit:
3756 ocfs2_commit_trans(osb, handle);
3757 out:
3758 if (meta_ac)
3759 ocfs2_free_alloc_context(meta_ac);
3760 return ret;
3761 }
3762
3763 static int ocfs2_change_ctime(struct inode *inode,
3764 struct buffer_head *di_bh)
3765 {
3766 int ret;
3767 handle_t *handle;
3768 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
3769
3770 handle = ocfs2_start_trans(OCFS2_SB(inode->i_sb),
3771 OCFS2_INODE_UPDATE_CREDITS);
3772 if (IS_ERR(handle)) {
3773 ret = PTR_ERR(handle);
3774 mlog_errno(ret);
3775 goto out;
3776 }
3777
3778 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
3779 OCFS2_JOURNAL_ACCESS_WRITE);
3780 if (ret) {
3781 mlog_errno(ret);
3782 goto out_commit;
3783 }
3784
3785 inode->i_ctime = CURRENT_TIME;
3786 di->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
3787 di->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
3788
3789 ocfs2_journal_dirty(handle, di_bh);
3790
3791 out_commit:
3792 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
3793 out:
3794 return ret;
3795 }
3796
3797 static int ocfs2_attach_refcount_tree(struct inode *inode,
3798 struct buffer_head *di_bh)
3799 {
3800 int ret, data_changed = 0;
3801 struct buffer_head *ref_root_bh = NULL;
3802 struct ocfs2_inode_info *oi = OCFS2_I(inode);
3803 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
3804 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3805 struct ocfs2_refcount_tree *ref_tree;
3806 unsigned int ext_flags;
3807 loff_t size;
3808 u32 cpos, num_clusters, clusters, p_cluster;
3809 struct ocfs2_cached_dealloc_ctxt dealloc;
3810 struct ocfs2_extent_tree di_et;
3811
3812 ocfs2_init_dealloc_ctxt(&dealloc);
3813
3814 if (!(oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL)) {
3815 ret = ocfs2_create_refcount_tree(inode, di_bh);
3816 if (ret) {
3817 mlog_errno(ret);
3818 goto out;
3819 }
3820 }
3821
3822 BUG_ON(!di->i_refcount_loc);
3823 ret = ocfs2_lock_refcount_tree(osb,
3824 le64_to_cpu(di->i_refcount_loc), 1,
3825 &ref_tree, &ref_root_bh);
3826 if (ret) {
3827 mlog_errno(ret);
3828 goto out;
3829 }
3830
3831 if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL)
3832 goto attach_xattr;
3833
3834 ocfs2_init_dinode_extent_tree(&di_et, INODE_CACHE(inode), di_bh);
3835
3836 size = i_size_read(inode);
3837 clusters = ocfs2_clusters_for_bytes(inode->i_sb, size);
3838
3839 cpos = 0;
3840 while (cpos < clusters) {
3841 ret = ocfs2_get_clusters(inode, cpos, &p_cluster,
3842 &num_clusters, &ext_flags);
3843
3844 if (p_cluster && !(ext_flags & OCFS2_EXT_REFCOUNTED)) {
3845 ret = ocfs2_add_refcount_flag(inode, &di_et,
3846 &ref_tree->rf_ci,
3847 ref_root_bh, cpos,
3848 p_cluster, num_clusters,
3849 &dealloc, NULL);
3850 if (ret) {
3851 mlog_errno(ret);
3852 goto unlock;
3853 }
3854
3855 data_changed = 1;
3856 }
3857 cpos += num_clusters;
3858 }
3859
3860 attach_xattr:
3861 if (oi->ip_dyn_features & OCFS2_HAS_XATTR_FL) {
3862 ret = ocfs2_xattr_attach_refcount_tree(inode, di_bh,
3863 &ref_tree->rf_ci,
3864 ref_root_bh,
3865 &dealloc);
3866 if (ret) {
3867 mlog_errno(ret);
3868 goto unlock;
3869 }
3870 }
3871
3872 if (data_changed) {
3873 ret = ocfs2_change_ctime(inode, di_bh);
3874 if (ret)
3875 mlog_errno(ret);
3876 }
3877
3878 unlock:
3879 ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
3880 brelse(ref_root_bh);
3881
3882 if (!ret && ocfs2_dealloc_has_cluster(&dealloc)) {
3883 ocfs2_schedule_truncate_log_flush(osb, 1);
3884 ocfs2_run_deallocs(osb, &dealloc);
3885 }
3886 out:
3887 /*
3888 * Empty the extent map so that we may get the right extent
3889 * record from the disk.
3890 */
3891 ocfs2_extent_map_trunc(inode, 0);
3892
3893 return ret;
3894 }
3895
3896 static int ocfs2_add_refcounted_extent(struct inode *inode,
3897 struct ocfs2_extent_tree *et,
3898 struct ocfs2_caching_info *ref_ci,
3899 struct buffer_head *ref_root_bh,
3900 u32 cpos, u32 p_cluster, u32 num_clusters,
3901 unsigned int ext_flags,
3902 struct ocfs2_cached_dealloc_ctxt *dealloc)
3903 {
3904 int ret;
3905 handle_t *handle;
3906 int credits = 0;
3907 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3908 struct ocfs2_alloc_context *meta_ac = NULL;
3909
3910 ret = ocfs2_lock_refcount_allocators(inode->i_sb,
3911 p_cluster, num_clusters,
3912 et, ref_ci,
3913 ref_root_bh, &meta_ac,
3914 NULL, &credits);
3915 if (ret) {
3916 mlog_errno(ret);
3917 goto out;
3918 }
3919
3920 handle = ocfs2_start_trans(osb, credits);
3921 if (IS_ERR(handle)) {
3922 ret = PTR_ERR(handle);
3923 mlog_errno(ret);
3924 goto out;
3925 }
3926
3927 ret = ocfs2_insert_extent(handle, et, cpos,
3928 ocfs2_clusters_to_blocks(inode->i_sb, p_cluster),
3929 num_clusters, ext_flags, meta_ac);
3930 if (ret) {
3931 mlog_errno(ret);
3932 goto out_commit;
3933 }
3934
3935 ret = ocfs2_increase_refcount(handle, ref_ci, ref_root_bh,
3936 p_cluster, num_clusters,
3937 meta_ac, dealloc);
3938 if (ret)
3939 mlog_errno(ret);
3940
3941 out_commit:
3942 ocfs2_commit_trans(osb, handle);
3943 out:
3944 if (meta_ac)
3945 ocfs2_free_alloc_context(meta_ac);
3946 return ret;
3947 }
3948
3949 static int ocfs2_duplicate_inline_data(struct inode *s_inode,
3950 struct buffer_head *s_bh,
3951 struct inode *t_inode,
3952 struct buffer_head *t_bh)
3953 {
3954 int ret;
3955 handle_t *handle;
3956 struct ocfs2_super *osb = OCFS2_SB(s_inode->i_sb);
3957 struct ocfs2_dinode *s_di = (struct ocfs2_dinode *)s_bh->b_data;
3958 struct ocfs2_dinode *t_di = (struct ocfs2_dinode *)t_bh->b_data;
3959
3960 BUG_ON(!(OCFS2_I(s_inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL));
3961
3962 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
3963 if (IS_ERR(handle)) {
3964 ret = PTR_ERR(handle);
3965 mlog_errno(ret);
3966 goto out;
3967 }
3968
3969 ret = ocfs2_journal_access_di(handle, INODE_CACHE(t_inode), t_bh,
3970 OCFS2_JOURNAL_ACCESS_WRITE);
3971 if (ret) {
3972 mlog_errno(ret);
3973 goto out_commit;
3974 }
3975
3976 t_di->id2.i_data.id_count = s_di->id2.i_data.id_count;
3977 memcpy(t_di->id2.i_data.id_data, s_di->id2.i_data.id_data,
3978 le16_to_cpu(s_di->id2.i_data.id_count));
3979 spin_lock(&OCFS2_I(t_inode)->ip_lock);
3980 OCFS2_I(t_inode)->ip_dyn_features |= OCFS2_INLINE_DATA_FL;
3981 t_di->i_dyn_features = cpu_to_le16(OCFS2_I(t_inode)->ip_dyn_features);
3982 spin_unlock(&OCFS2_I(t_inode)->ip_lock);
3983
3984 ocfs2_journal_dirty(handle, t_bh);
3985
3986 out_commit:
3987 ocfs2_commit_trans(osb, handle);
3988 out:
3989 return ret;
3990 }
3991
3992 static int ocfs2_duplicate_extent_list(struct inode *s_inode,
3993 struct inode *t_inode,
3994 struct buffer_head *t_bh,
3995 struct ocfs2_caching_info *ref_ci,
3996 struct buffer_head *ref_root_bh,
3997 struct ocfs2_cached_dealloc_ctxt *dealloc)
3998 {
3999 int ret = 0;
4000 u32 p_cluster, num_clusters, clusters, cpos;
4001 loff_t size;
4002 unsigned int ext_flags;
4003 struct ocfs2_extent_tree et;
4004
4005 ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(t_inode), t_bh);
4006
4007 size = i_size_read(s_inode);
4008 clusters = ocfs2_clusters_for_bytes(s_inode->i_sb, size);
4009
4010 cpos = 0;
4011 while (cpos < clusters) {
4012 ret = ocfs2_get_clusters(s_inode, cpos, &p_cluster,
4013 &num_clusters, &ext_flags);
4014
4015 if (p_cluster) {
4016 ret = ocfs2_add_refcounted_extent(t_inode, &et,
4017 ref_ci, ref_root_bh,
4018 cpos, p_cluster,
4019 num_clusters,
4020 ext_flags,
4021 dealloc);
4022 if (ret) {
4023 mlog_errno(ret);
4024 goto out;
4025 }
4026 }
4027
4028 cpos += num_clusters;
4029 }
4030
4031 out:
4032 return ret;
4033 }
4034
4035 /*
4036 * change the new file's attributes to the src.
4037 *
4038 * reflink creates a snapshot of a file, that means the attributes
4039 * must be identical except for three exceptions - nlink, ino, and ctime.
4040 */
4041 static int ocfs2_complete_reflink(struct inode *s_inode,
4042 struct buffer_head *s_bh,
4043 struct inode *t_inode,
4044 struct buffer_head *t_bh,
4045 bool preserve)
4046 {
4047 int ret;
4048 handle_t *handle;
4049 struct ocfs2_dinode *s_di = (struct ocfs2_dinode *)s_bh->b_data;
4050 struct ocfs2_dinode *di = (struct ocfs2_dinode *)t_bh->b_data;
4051 loff_t size = i_size_read(s_inode);
4052
4053 handle = ocfs2_start_trans(OCFS2_SB(t_inode->i_sb),
4054 OCFS2_INODE_UPDATE_CREDITS);
4055 if (IS_ERR(handle)) {
4056 ret = PTR_ERR(handle);
4057 mlog_errno(ret);
4058 return ret;
4059 }
4060
4061 ret = ocfs2_journal_access_di(handle, INODE_CACHE(t_inode), t_bh,
4062 OCFS2_JOURNAL_ACCESS_WRITE);
4063 if (ret) {
4064 mlog_errno(ret);
4065 goto out_commit;
4066 }
4067
4068 spin_lock(&OCFS2_I(t_inode)->ip_lock);
4069 OCFS2_I(t_inode)->ip_clusters = OCFS2_I(s_inode)->ip_clusters;
4070 OCFS2_I(t_inode)->ip_attr = OCFS2_I(s_inode)->ip_attr;
4071 OCFS2_I(t_inode)->ip_dyn_features = OCFS2_I(s_inode)->ip_dyn_features;
4072 spin_unlock(&OCFS2_I(t_inode)->ip_lock);
4073 i_size_write(t_inode, size);
4074
4075 di->i_xattr_inline_size = s_di->i_xattr_inline_size;
4076 di->i_clusters = s_di->i_clusters;
4077 di->i_size = s_di->i_size;
4078 di->i_dyn_features = s_di->i_dyn_features;
4079 di->i_attr = s_di->i_attr;
4080
4081 if (preserve) {
4082 di->i_uid = s_di->i_uid;
4083 di->i_gid = s_di->i_gid;
4084 di->i_mode = s_di->i_mode;
4085
4086 /*
4087 * update time.
4088 * we want mtime to appear identical to the source and
4089 * update ctime.
4090 */
4091 t_inode->i_ctime = CURRENT_TIME;
4092
4093 di->i_ctime = cpu_to_le64(t_inode->i_ctime.tv_sec);
4094 di->i_ctime_nsec = cpu_to_le32(t_inode->i_ctime.tv_nsec);
4095
4096 t_inode->i_mtime = s_inode->i_mtime;
4097 di->i_mtime = s_di->i_mtime;
4098 di->i_mtime_nsec = s_di->i_mtime_nsec;
4099 }
4100
4101 ocfs2_journal_dirty(handle, t_bh);
4102
4103 out_commit:
4104 ocfs2_commit_trans(OCFS2_SB(t_inode->i_sb), handle);
4105 return ret;
4106 }
4107
4108 static int ocfs2_create_reflink_node(struct inode *s_inode,
4109 struct buffer_head *s_bh,
4110 struct inode *t_inode,
4111 struct buffer_head *t_bh,
4112 bool preserve)
4113 {
4114 int ret;
4115 struct buffer_head *ref_root_bh = NULL;
4116 struct ocfs2_cached_dealloc_ctxt dealloc;
4117 struct ocfs2_super *osb = OCFS2_SB(s_inode->i_sb);
4118 struct ocfs2_refcount_block *rb;
4119 struct ocfs2_dinode *di = (struct ocfs2_dinode *)s_bh->b_data;
4120 struct ocfs2_refcount_tree *ref_tree;
4121
4122 ocfs2_init_dealloc_ctxt(&dealloc);
4123
4124 ret = ocfs2_set_refcount_tree(t_inode, t_bh,
4125 le64_to_cpu(di->i_refcount_loc));
4126 if (ret) {
4127 mlog_errno(ret);
4128 goto out;
4129 }
4130
4131 if (OCFS2_I(s_inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
4132 ret = ocfs2_duplicate_inline_data(s_inode, s_bh,
4133 t_inode, t_bh);
4134 if (ret)
4135 mlog_errno(ret);
4136 goto out;
4137 }
4138
4139 ret = ocfs2_lock_refcount_tree(osb, le64_to_cpu(di->i_refcount_loc),
4140 1, &ref_tree, &ref_root_bh);
4141 if (ret) {
4142 mlog_errno(ret);
4143 goto out;
4144 }
4145 rb = (struct ocfs2_refcount_block *)ref_root_bh->b_data;
4146
4147 ret = ocfs2_duplicate_extent_list(s_inode, t_inode, t_bh,
4148 &ref_tree->rf_ci, ref_root_bh,
4149 &dealloc);
4150 if (ret) {
4151 mlog_errno(ret);
4152 goto out_unlock_refcount;
4153 }
4154
4155 out_unlock_refcount:
4156 ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
4157 brelse(ref_root_bh);
4158 out:
4159 if (ocfs2_dealloc_has_cluster(&dealloc)) {
4160 ocfs2_schedule_truncate_log_flush(osb, 1);
4161 ocfs2_run_deallocs(osb, &dealloc);
4162 }
4163
4164 return ret;
4165 }
4166
4167 static int __ocfs2_reflink(struct dentry *old_dentry,
4168 struct buffer_head *old_bh,
4169 struct inode *new_inode,
4170 bool preserve)
4171 {
4172 int ret;
4173 struct inode *inode = old_dentry->d_inode;
4174 struct buffer_head *new_bh = NULL;
4175
4176 ret = filemap_fdatawrite(inode->i_mapping);
4177 if (ret) {
4178 mlog_errno(ret);
4179 goto out;
4180 }
4181
4182 ret = ocfs2_attach_refcount_tree(inode, old_bh);
4183 if (ret) {
4184 mlog_errno(ret);
4185 goto out;
4186 }
4187
4188 mutex_lock(&new_inode->i_mutex);
4189 ret = ocfs2_inode_lock(new_inode, &new_bh, 1);
4190 if (ret) {
4191 mlog_errno(ret);
4192 goto out_unlock;
4193 }
4194
4195 ret = ocfs2_create_reflink_node(inode, old_bh,
4196 new_inode, new_bh, preserve);
4197 if (ret) {
4198 mlog_errno(ret);
4199 goto inode_unlock;
4200 }
4201
4202 if (OCFS2_I(inode)->ip_dyn_features & OCFS2_HAS_XATTR_FL) {
4203 ret = ocfs2_reflink_xattrs(inode, old_bh,
4204 new_inode, new_bh,
4205 preserve);
4206 if (ret) {
4207 mlog_errno(ret);
4208 goto inode_unlock;
4209 }
4210 }
4211
4212 ret = ocfs2_complete_reflink(inode, old_bh,
4213 new_inode, new_bh, preserve);
4214 if (ret)
4215 mlog_errno(ret);
4216
4217 inode_unlock:
4218 ocfs2_inode_unlock(new_inode, 1);
4219 brelse(new_bh);
4220 out_unlock:
4221 mutex_unlock(&new_inode->i_mutex);
4222 out:
4223 if (!ret) {
4224 ret = filemap_fdatawait(inode->i_mapping);
4225 if (ret)
4226 mlog_errno(ret);
4227 }
4228 return ret;
4229 }
4230
4231 static int ocfs2_reflink(struct dentry *old_dentry, struct inode *dir,
4232 struct dentry *new_dentry, bool preserve)
4233 {
4234 int error;
4235 struct inode *inode = old_dentry->d_inode;
4236 struct buffer_head *old_bh = NULL;
4237 struct inode *new_orphan_inode = NULL;
4238
4239 if (!ocfs2_refcount_tree(OCFS2_SB(inode->i_sb)))
4240 return -EOPNOTSUPP;
4241
4242 error = ocfs2_create_inode_in_orphan(dir, inode->i_mode,
4243 &new_orphan_inode);
4244 if (error) {
4245 mlog_errno(error);
4246 goto out;
4247 }
4248
4249 error = ocfs2_inode_lock(inode, &old_bh, 1);
4250 if (error) {
4251 mlog_errno(error);
4252 goto out;
4253 }
4254
4255 down_write(&OCFS2_I(inode)->ip_xattr_sem);
4256 down_write(&OCFS2_I(inode)->ip_alloc_sem);
4257 error = __ocfs2_reflink(old_dentry, old_bh,
4258 new_orphan_inode, preserve);
4259 up_write(&OCFS2_I(inode)->ip_alloc_sem);
4260 up_write(&OCFS2_I(inode)->ip_xattr_sem);
4261
4262 ocfs2_inode_unlock(inode, 1);
4263 brelse(old_bh);
4264
4265 if (error) {
4266 mlog_errno(error);
4267 goto out;
4268 }
4269
4270 /* If the security isn't preserved, we need to re-initialize them. */
4271 if (!preserve) {
4272 error = ocfs2_init_security_and_acl(dir, new_orphan_inode);
4273 if (error)
4274 mlog_errno(error);
4275 }
4276 out:
4277 if (!error) {
4278 error = ocfs2_mv_orphaned_inode_to_new(dir, new_orphan_inode,
4279 new_dentry);
4280 if (error)
4281 mlog_errno(error);
4282 }
4283
4284 if (new_orphan_inode) {
4285 /*
4286 * We need to open_unlock the inode no matter whether we
4287 * succeed or not, so that other nodes can delete it later.
4288 */
4289 ocfs2_open_unlock(new_orphan_inode);
4290 if (error)
4291 iput(new_orphan_inode);
4292 }
4293
4294 return error;
4295 }
4296
4297 /*
4298 * Below here are the bits used by OCFS2_IOC_REFLINK() to fake
4299 * sys_reflink(). This will go away when vfs_reflink() exists in
4300 * fs/namei.c.
4301 */
4302
4303 /* copied from may_create in VFS. */
4304 static inline int ocfs2_may_create(struct inode *dir, struct dentry *child)
4305 {
4306 if (child->d_inode)
4307 return -EEXIST;
4308 if (IS_DEADDIR(dir))
4309 return -ENOENT;
4310 return inode_permission(dir, MAY_WRITE | MAY_EXEC);
4311 }
4312
4313 /* copied from user_path_parent. */
4314 static int ocfs2_user_path_parent(const char __user *path,
4315 struct nameidata *nd, char **name)
4316 {
4317 char *s = getname(path);
4318 int error;
4319
4320 if (IS_ERR(s))
4321 return PTR_ERR(s);
4322
4323 error = path_lookup(s, LOOKUP_PARENT, nd);
4324 if (error)
4325 putname(s);
4326 else
4327 *name = s;
4328
4329 return error;
4330 }
4331
4332 /**
4333 * ocfs2_vfs_reflink - Create a reference-counted link
4334 *
4335 * @old_dentry: source dentry + inode
4336 * @dir: directory to create the target
4337 * @new_dentry: target dentry
4338 * @preserve: if true, preserve all file attributes
4339 */
4340 static int ocfs2_vfs_reflink(struct dentry *old_dentry, struct inode *dir,
4341 struct dentry *new_dentry, bool preserve)
4342 {
4343 struct inode *inode = old_dentry->d_inode;
4344 int error;
4345
4346 if (!inode)
4347 return -ENOENT;
4348
4349 error = ocfs2_may_create(dir, new_dentry);
4350 if (error)
4351 return error;
4352
4353 if (dir->i_sb != inode->i_sb)
4354 return -EXDEV;
4355
4356 /*
4357 * A reflink to an append-only or immutable file cannot be created.
4358 */
4359 if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
4360 return -EPERM;
4361
4362 /* Only regular files can be reflinked. */
4363 if (!S_ISREG(inode->i_mode))
4364 return -EPERM;
4365
4366 /*
4367 * If the caller wants to preserve ownership, they require the
4368 * rights to do so.
4369 */
4370 if (preserve) {
4371 if ((current_fsuid() != inode->i_uid) && !capable(CAP_CHOWN))
4372 return -EPERM;
4373 if (!in_group_p(inode->i_gid) && !capable(CAP_CHOWN))
4374 return -EPERM;
4375 }
4376
4377 /*
4378 * If the caller is modifying any aspect of the attributes, they
4379 * are not creating a snapshot. They need read permission on the
4380 * file.
4381 */
4382 if (!preserve) {
4383 error = inode_permission(inode, MAY_READ);
4384 if (error)
4385 return error;
4386 }
4387
4388 mutex_lock(&inode->i_mutex);
4389 vfs_dq_init(dir);
4390 error = ocfs2_reflink(old_dentry, dir, new_dentry, preserve);
4391 mutex_unlock(&inode->i_mutex);
4392 if (!error)
4393 fsnotify_create(dir, new_dentry);
4394 return error;
4395 }
4396 /*
4397 * Most codes are copied from sys_linkat.
4398 */
4399 int ocfs2_reflink_ioctl(struct inode *inode,
4400 const char __user *oldname,
4401 const char __user *newname,
4402 bool preserve)
4403 {
4404 struct dentry *new_dentry;
4405 struct nameidata nd;
4406 struct path old_path;
4407 int error;
4408 char *to = NULL;
4409
4410 if (!ocfs2_refcount_tree(OCFS2_SB(inode->i_sb)))
4411 return -EOPNOTSUPP;
4412
4413 error = user_path_at(AT_FDCWD, oldname, 0, &old_path);
4414 if (error) {
4415 mlog_errno(error);
4416 return error;
4417 }
4418
4419 error = ocfs2_user_path_parent(newname, &nd, &to);
4420 if (error) {
4421 mlog_errno(error);
4422 goto out;
4423 }
4424
4425 error = -EXDEV;
4426 if (old_path.mnt != nd.path.mnt)
4427 goto out_release;
4428 new_dentry = lookup_create(&nd, 0);
4429 error = PTR_ERR(new_dentry);
4430 if (IS_ERR(new_dentry)) {
4431 mlog_errno(error);
4432 goto out_unlock;
4433 }
4434
4435 error = mnt_want_write(nd.path.mnt);
4436 if (error) {
4437 mlog_errno(error);
4438 goto out_dput;
4439 }
4440
4441 error = ocfs2_vfs_reflink(old_path.dentry,
4442 nd.path.dentry->d_inode,
4443 new_dentry, preserve);
4444 mnt_drop_write(nd.path.mnt);
4445 out_dput:
4446 dput(new_dentry);
4447 out_unlock:
4448 mutex_unlock(&nd.path.dentry->d_inode->i_mutex);
4449 out_release:
4450 path_put(&nd.path);
4451 putname(to);
4452 out:
4453 path_put(&old_path);
4454
4455 return error;
4456 }
Linux with added FPC-III support