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arm: ep93xx: Add basic interrupt info
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / ocfs2 / refcounttree.c
blobc384d634872a24cc673b1cd0f4e9b837cc433982
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/slab.h>
41 #include <linux/writeback.h>
42 #include <linux/pagevec.h>
43 #include <linux/swap.h>
44 #include <linux/security.h>
45 #include <linux/fsnotify.h>
46 #include <linux/quotaops.h>
47 #include <linux/namei.h>
48 #include <linux/mount.h>
49
50 struct ocfs2_cow_context {
51 struct inode *inode;
52 struct file *file;
53 u32 cow_start;
54 u32 cow_len;
55 struct ocfs2_extent_tree data_et;
56 struct ocfs2_refcount_tree *ref_tree;
57 struct buffer_head *ref_root_bh;
58 struct ocfs2_alloc_context *meta_ac;
59 struct ocfs2_alloc_context *data_ac;
60 struct ocfs2_cached_dealloc_ctxt dealloc;
61 void *cow_object;
62 struct ocfs2_post_refcount *post_refcount;
63 int extra_credits;
64 int (*get_clusters)(struct ocfs2_cow_context *context,
65 u32 v_cluster, u32 *p_cluster,
66 u32 *num_clusters,
67 unsigned int *extent_flags);
68 int (*cow_duplicate_clusters)(handle_t *handle,
69 struct 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 suballoc_loc, 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(handle, meta_ac, 1, &suballoc_loc,
601 &suballoc_bit_start, &num_got,
602 &first_blkno);
603 if (ret) {
604 mlog_errno(ret);
605 goto out_commit;
606 }
607
608 new_tree = ocfs2_allocate_refcount_tree(osb, first_blkno);
609 if (!new_tree) {
610 ret = -ENOMEM;
611 mlog_errno(ret);
612 goto out_commit;
613 }
614
615 new_bh = sb_getblk(inode->i_sb, first_blkno);
616 ocfs2_set_new_buffer_uptodate(&new_tree->rf_ci, new_bh);
617
618 ret = ocfs2_journal_access_rb(handle, &new_tree->rf_ci, new_bh,
619 OCFS2_JOURNAL_ACCESS_CREATE);
620 if (ret) {
621 mlog_errno(ret);
622 goto out_commit;
623 }
624
625 /* Initialize ocfs2_refcount_block. */
626 rb = (struct ocfs2_refcount_block *)new_bh->b_data;
627 memset(rb, 0, inode->i_sb->s_blocksize);
628 strcpy((void *)rb, OCFS2_REFCOUNT_BLOCK_SIGNATURE);
629 rb->rf_suballoc_slot = cpu_to_le16(meta_ac->ac_alloc_slot);
630 rb->rf_suballoc_loc = cpu_to_le64(suballoc_loc);
631 rb->rf_suballoc_bit = cpu_to_le16(suballoc_bit_start);
632 rb->rf_fs_generation = cpu_to_le32(osb->fs_generation);
633 rb->rf_blkno = cpu_to_le64(first_blkno);
634 rb->rf_count = cpu_to_le32(1);
635 rb->rf_records.rl_count =
636 cpu_to_le16(ocfs2_refcount_recs_per_rb(osb->sb));
637 spin_lock(&osb->osb_lock);
638 rb->rf_generation = osb->s_next_generation++;
639 spin_unlock(&osb->osb_lock);
640
641 ocfs2_journal_dirty(handle, new_bh);
642
643 spin_lock(&oi->ip_lock);
644 oi->ip_dyn_features |= OCFS2_HAS_REFCOUNT_FL;
645 di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
646 di->i_refcount_loc = cpu_to_le64(first_blkno);
647 spin_unlock(&oi->ip_lock);
648
649 mlog(0, "created tree for inode %lu, refblock %llu\n",
650 inode->i_ino, (unsigned long long)first_blkno);
651
652 ocfs2_journal_dirty(handle, di_bh);
653
654 /*
655 * We have to init the tree lock here since it will use
656 * the generation number to create it.
657 */
658 new_tree->rf_generation = le32_to_cpu(rb->rf_generation);
659 ocfs2_init_refcount_tree_lock(osb, new_tree, first_blkno,
660 new_tree->rf_generation);
661
662 spin_lock(&osb->osb_lock);
663 tree = ocfs2_find_refcount_tree(osb, first_blkno);
664
665 /*
666 * We've just created a new refcount tree in this block. If
667 * we found a refcount tree on the ocfs2_super, it must be
668 * one we just deleted. We free the old tree before
669 * inserting the new tree.
670 */
671 BUG_ON(tree && tree->rf_generation == new_tree->rf_generation);
672 if (tree)
673 ocfs2_erase_refcount_tree_from_list_no_lock(osb, tree);
674 ocfs2_insert_refcount_tree(osb, new_tree);
675 spin_unlock(&osb->osb_lock);
676 new_tree = NULL;
677 if (tree)
678 ocfs2_refcount_tree_put(tree);
679
680 out_commit:
681 ocfs2_commit_trans(osb, handle);
682
683 out:
684 if (new_tree) {
685 ocfs2_metadata_cache_exit(&new_tree->rf_ci);
686 kfree(new_tree);
687 }
688
689 brelse(new_bh);
690 if (meta_ac)
691 ocfs2_free_alloc_context(meta_ac);
692
693 return ret;
694 }
695
696 static int ocfs2_set_refcount_tree(struct inode *inode,
697 struct buffer_head *di_bh,
698 u64 refcount_loc)
699 {
700 int ret;
701 handle_t *handle = NULL;
702 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
703 struct ocfs2_inode_info *oi = OCFS2_I(inode);
704 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
705 struct buffer_head *ref_root_bh = NULL;
706 struct ocfs2_refcount_block *rb;
707 struct ocfs2_refcount_tree *ref_tree;
708
709 BUG_ON(oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL);
710
711 ret = ocfs2_lock_refcount_tree(osb, refcount_loc, 1,
712 &ref_tree, &ref_root_bh);
713 if (ret) {
714 mlog_errno(ret);
715 return ret;
716 }
717
718 handle = ocfs2_start_trans(osb, OCFS2_REFCOUNT_TREE_SET_CREDITS);
719 if (IS_ERR(handle)) {
720 ret = PTR_ERR(handle);
721 mlog_errno(ret);
722 goto out;
723 }
724
725 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
726 OCFS2_JOURNAL_ACCESS_WRITE);
727 if (ret) {
728 mlog_errno(ret);
729 goto out_commit;
730 }
731
732 ret = ocfs2_journal_access_rb(handle, &ref_tree->rf_ci, ref_root_bh,
733 OCFS2_JOURNAL_ACCESS_WRITE);
734 if (ret) {
735 mlog_errno(ret);
736 goto out_commit;
737 }
738
739 rb = (struct ocfs2_refcount_block *)ref_root_bh->b_data;
740 le32_add_cpu(&rb->rf_count, 1);
741
742 ocfs2_journal_dirty(handle, ref_root_bh);
743
744 spin_lock(&oi->ip_lock);
745 oi->ip_dyn_features |= OCFS2_HAS_REFCOUNT_FL;
746 di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
747 di->i_refcount_loc = cpu_to_le64(refcount_loc);
748 spin_unlock(&oi->ip_lock);
749 ocfs2_journal_dirty(handle, di_bh);
750
751 out_commit:
752 ocfs2_commit_trans(osb, handle);
753 out:
754 ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
755 brelse(ref_root_bh);
756
757 return ret;
758 }
759
760 int ocfs2_remove_refcount_tree(struct inode *inode, struct buffer_head *di_bh)
761 {
762 int ret, delete_tree = 0;
763 handle_t *handle = NULL;
764 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
765 struct ocfs2_inode_info *oi = OCFS2_I(inode);
766 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
767 struct ocfs2_refcount_block *rb;
768 struct inode *alloc_inode = NULL;
769 struct buffer_head *alloc_bh = NULL;
770 struct buffer_head *blk_bh = NULL;
771 struct ocfs2_refcount_tree *ref_tree;
772 int credits = OCFS2_REFCOUNT_TREE_REMOVE_CREDITS;
773 u64 blk = 0, bg_blkno = 0, ref_blkno = le64_to_cpu(di->i_refcount_loc);
774 u16 bit = 0;
775
776 if (!(oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL))
777 return 0;
778
779 BUG_ON(!ref_blkno);
780 ret = ocfs2_lock_refcount_tree(osb, ref_blkno, 1, &ref_tree, &blk_bh);
781 if (ret) {
782 mlog_errno(ret);
783 return ret;
784 }
785
786 rb = (struct ocfs2_refcount_block *)blk_bh->b_data;
787
788 /*
789 * If we are the last user, we need to free the block.
790 * So lock the allocator ahead.
791 */
792 if (le32_to_cpu(rb->rf_count) == 1) {
793 blk = le64_to_cpu(rb->rf_blkno);
794 bit = le16_to_cpu(rb->rf_suballoc_bit);
795 if (rb->rf_suballoc_loc)
796 bg_blkno = le64_to_cpu(rb->rf_suballoc_loc);
797 else
798 bg_blkno = ocfs2_which_suballoc_group(blk, bit);
799
800 alloc_inode = ocfs2_get_system_file_inode(osb,
801 EXTENT_ALLOC_SYSTEM_INODE,
802 le16_to_cpu(rb->rf_suballoc_slot));
803 if (!alloc_inode) {
804 ret = -ENOMEM;
805 mlog_errno(ret);
806 goto out;
807 }
808 mutex_lock(&alloc_inode->i_mutex);
809
810 ret = ocfs2_inode_lock(alloc_inode, &alloc_bh, 1);
811 if (ret) {
812 mlog_errno(ret);
813 goto out_mutex;
814 }
815
816 credits += OCFS2_SUBALLOC_FREE;
817 }
818
819 handle = ocfs2_start_trans(osb, credits);
820 if (IS_ERR(handle)) {
821 ret = PTR_ERR(handle);
822 mlog_errno(ret);
823 goto out_unlock;
824 }
825
826 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
827 OCFS2_JOURNAL_ACCESS_WRITE);
828 if (ret) {
829 mlog_errno(ret);
830 goto out_commit;
831 }
832
833 ret = ocfs2_journal_access_rb(handle, &ref_tree->rf_ci, blk_bh,
834 OCFS2_JOURNAL_ACCESS_WRITE);
835 if (ret) {
836 mlog_errno(ret);
837 goto out_commit;
838 }
839
840 spin_lock(&oi->ip_lock);
841 oi->ip_dyn_features &= ~OCFS2_HAS_REFCOUNT_FL;
842 di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
843 di->i_refcount_loc = 0;
844 spin_unlock(&oi->ip_lock);
845 ocfs2_journal_dirty(handle, di_bh);
846
847 le32_add_cpu(&rb->rf_count , -1);
848 ocfs2_journal_dirty(handle, blk_bh);
849
850 if (!rb->rf_count) {
851 delete_tree = 1;
852 ocfs2_erase_refcount_tree_from_list(osb, ref_tree);
853 ret = ocfs2_free_suballoc_bits(handle, alloc_inode,
854 alloc_bh, bit, bg_blkno, 1);
855 if (ret)
856 mlog_errno(ret);
857 }
858
859 out_commit:
860 ocfs2_commit_trans(osb, handle);
861 out_unlock:
862 if (alloc_inode) {
863 ocfs2_inode_unlock(alloc_inode, 1);
864 brelse(alloc_bh);
865 }
866 out_mutex:
867 if (alloc_inode) {
868 mutex_unlock(&alloc_inode->i_mutex);
869 iput(alloc_inode);
870 }
871 out:
872 ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
873 if (delete_tree)
874 ocfs2_refcount_tree_put(ref_tree);
875 brelse(blk_bh);
876
877 return ret;
878 }
879
880 static void ocfs2_find_refcount_rec_in_rl(struct ocfs2_caching_info *ci,
881 struct buffer_head *ref_leaf_bh,
882 u64 cpos, unsigned int len,
883 struct ocfs2_refcount_rec *ret_rec,
884 int *index)
885 {
886 int i = 0;
887 struct ocfs2_refcount_block *rb =
888 (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
889 struct ocfs2_refcount_rec *rec = NULL;
890
891 for (; i < le16_to_cpu(rb->rf_records.rl_used); i++) {
892 rec = &rb->rf_records.rl_recs[i];
893
894 if (le64_to_cpu(rec->r_cpos) +
895 le32_to_cpu(rec->r_clusters) <= cpos)
896 continue;
897 else if (le64_to_cpu(rec->r_cpos) > cpos)
898 break;
899
900 /* ok, cpos fail in this rec. Just return. */
901 if (ret_rec)
902 *ret_rec = *rec;
903 goto out;
904 }
905
906 if (ret_rec) {
907 /* We meet with a hole here, so fake the rec. */
908 ret_rec->r_cpos = cpu_to_le64(cpos);
909 ret_rec->r_refcount = 0;
910 if (i < le16_to_cpu(rb->rf_records.rl_used) &&
911 le64_to_cpu(rec->r_cpos) < cpos + len)
912 ret_rec->r_clusters =
913 cpu_to_le32(le64_to_cpu(rec->r_cpos) - cpos);
914 else
915 ret_rec->r_clusters = cpu_to_le32(len);
916 }
917
918 out:
919 *index = i;
920 }
921
922 /*
923 * Try to remove refcount tree. The mechanism is:
924 * 1) Check whether i_clusters == 0, if no, exit.
925 * 2) check whether we have i_xattr_loc in dinode. if yes, exit.
926 * 3) Check whether we have inline xattr stored outside, if yes, exit.
927 * 4) Remove the tree.
928 */
929 int ocfs2_try_remove_refcount_tree(struct inode *inode,
930 struct buffer_head *di_bh)
931 {
932 int ret;
933 struct ocfs2_inode_info *oi = OCFS2_I(inode);
934 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
935
936 down_write(&oi->ip_xattr_sem);
937 down_write(&oi->ip_alloc_sem);
938
939 if (oi->ip_clusters)
940 goto out;
941
942 if ((oi->ip_dyn_features & OCFS2_HAS_XATTR_FL) && di->i_xattr_loc)
943 goto out;
944
945 if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL &&
946 ocfs2_has_inline_xattr_value_outside(inode, di))
947 goto out;
948
949 ret = ocfs2_remove_refcount_tree(inode, di_bh);
950 if (ret)
951 mlog_errno(ret);
952 out:
953 up_write(&oi->ip_alloc_sem);
954 up_write(&oi->ip_xattr_sem);
955 return 0;
956 }
957
958 /*
959 * Find the end range for a leaf refcount block indicated by
960 * el->l_recs[index].e_blkno.
961 */
962 static int ocfs2_get_refcount_cpos_end(struct ocfs2_caching_info *ci,
963 struct buffer_head *ref_root_bh,
964 struct ocfs2_extent_block *eb,
965 struct ocfs2_extent_list *el,
966 int index, u32 *cpos_end)
967 {
968 int ret, i, subtree_root;
969 u32 cpos;
970 u64 blkno;
971 struct super_block *sb = ocfs2_metadata_cache_get_super(ci);
972 struct ocfs2_path *left_path = NULL, *right_path = NULL;
973 struct ocfs2_extent_tree et;
974 struct ocfs2_extent_list *tmp_el;
975
976 if (index < le16_to_cpu(el->l_next_free_rec) - 1) {
977 /*
978 * We have a extent rec after index, so just use the e_cpos
979 * of the next extent rec.
980 */
981 *cpos_end = le32_to_cpu(el->l_recs[index+1].e_cpos);
982 return 0;
983 }
984
985 if (!eb || (eb && !eb->h_next_leaf_blk)) {
986 /*
987 * We are the last extent rec, so any high cpos should
988 * be stored in this leaf refcount block.
989 */
990 *cpos_end = UINT_MAX;
991 return 0;
992 }
993
994 /*
995 * If the extent block isn't the last one, we have to find
996 * the subtree root between this extent block and the next
997 * leaf extent block and get the corresponding e_cpos from
998 * the subroot. Otherwise we may corrupt the b-tree.
999 */
1000 ocfs2_init_refcount_extent_tree(&et, ci, ref_root_bh);
1001
1002 left_path = ocfs2_new_path_from_et(&et);
1003 if (!left_path) {
1004 ret = -ENOMEM;
1005 mlog_errno(ret);
1006 goto out;
1007 }
1008
1009 cpos = le32_to_cpu(eb->h_list.l_recs[index].e_cpos);
1010 ret = ocfs2_find_path(ci, left_path, cpos);
1011 if (ret) {
1012 mlog_errno(ret);
1013 goto out;
1014 }
1015
1016 right_path = ocfs2_new_path_from_path(left_path);
1017 if (!right_path) {
1018 ret = -ENOMEM;
1019 mlog_errno(ret);
1020 goto out;
1021 }
1022
1023 ret = ocfs2_find_cpos_for_right_leaf(sb, left_path, &cpos);
1024 if (ret) {
1025 mlog_errno(ret);
1026 goto out;
1027 }
1028
1029 ret = ocfs2_find_path(ci, right_path, cpos);
1030 if (ret) {
1031 mlog_errno(ret);
1032 goto out;
1033 }
1034
1035 subtree_root = ocfs2_find_subtree_root(&et, left_path,
1036 right_path);
1037
1038 tmp_el = left_path->p_node[subtree_root].el;
1039 blkno = left_path->p_node[subtree_root+1].bh->b_blocknr;
1040 for (i = 0; i < le32_to_cpu(tmp_el->l_next_free_rec); i++) {
1041 if (le64_to_cpu(tmp_el->l_recs[i].e_blkno) == blkno) {
1042 *cpos_end = le32_to_cpu(tmp_el->l_recs[i+1].e_cpos);
1043 break;
1044 }
1045 }
1046
1047 BUG_ON(i == le32_to_cpu(tmp_el->l_next_free_rec));
1048
1049 out:
1050 ocfs2_free_path(left_path);
1051 ocfs2_free_path(right_path);
1052 return ret;
1053 }
1054
1055 /*
1056 * Given a cpos and len, try to find the refcount record which contains cpos.
1057 * 1. If cpos can be found in one refcount record, return the record.
1058 * 2. If cpos can't be found, return a fake record which start from cpos
1059 * and end at a small value between cpos+len and start of the next record.
1060 * This fake record has r_refcount = 0.
1061 */
1062 static int ocfs2_get_refcount_rec(struct ocfs2_caching_info *ci,
1063 struct buffer_head *ref_root_bh,
1064 u64 cpos, unsigned int len,
1065 struct ocfs2_refcount_rec *ret_rec,
1066 int *index,
1067 struct buffer_head **ret_bh)
1068 {
1069 int ret = 0, i, found;
1070 u32 low_cpos, uninitialized_var(cpos_end);
1071 struct ocfs2_extent_list *el;
1072 struct ocfs2_extent_rec *rec = NULL;
1073 struct ocfs2_extent_block *eb = NULL;
1074 struct buffer_head *eb_bh = NULL, *ref_leaf_bh = NULL;
1075 struct super_block *sb = ocfs2_metadata_cache_get_super(ci);
1076 struct ocfs2_refcount_block *rb =
1077 (struct ocfs2_refcount_block *)ref_root_bh->b_data;
1078
1079 if (!(le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL)) {
1080 ocfs2_find_refcount_rec_in_rl(ci, ref_root_bh, cpos, len,
1081 ret_rec, index);
1082 *ret_bh = ref_root_bh;
1083 get_bh(ref_root_bh);
1084 return 0;
1085 }
1086
1087 el = &rb->rf_list;
1088 low_cpos = cpos & OCFS2_32BIT_POS_MASK;
1089
1090 if (el->l_tree_depth) {
1091 ret = ocfs2_find_leaf(ci, el, low_cpos, &eb_bh);
1092 if (ret) {
1093 mlog_errno(ret);
1094 goto out;
1095 }
1096
1097 eb = (struct ocfs2_extent_block *) eb_bh->b_data;
1098 el = &eb->h_list;
1099
1100 if (el->l_tree_depth) {
1101 ocfs2_error(sb,
1102 "refcount tree %llu has non zero tree "
1103 "depth in leaf btree tree block %llu\n",
1104 (unsigned long long)ocfs2_metadata_cache_owner(ci),
1105 (unsigned long long)eb_bh->b_blocknr);
1106 ret = -EROFS;
1107 goto out;
1108 }
1109 }
1110
1111 found = 0;
1112 for (i = le16_to_cpu(el->l_next_free_rec) - 1; i >= 0; i--) {
1113 rec = &el->l_recs[i];
1114
1115 if (le32_to_cpu(rec->e_cpos) <= low_cpos) {
1116 found = 1;
1117 break;
1118 }
1119 }
1120
1121 if (found) {
1122 ret = ocfs2_get_refcount_cpos_end(ci, ref_root_bh,
1123 eb, el, i, &cpos_end);
1124 if (ret) {
1125 mlog_errno(ret);
1126 goto out;
1127 }
1128
1129 if (cpos_end < low_cpos + len)
1130 len = cpos_end - low_cpos;
1131 }
1132
1133 ret = ocfs2_read_refcount_block(ci, le64_to_cpu(rec->e_blkno),
1134 &ref_leaf_bh);
1135 if (ret) {
1136 mlog_errno(ret);
1137 goto out;
1138 }
1139
1140 ocfs2_find_refcount_rec_in_rl(ci, ref_leaf_bh, cpos, len,
1141 ret_rec, index);
1142 *ret_bh = ref_leaf_bh;
1143 out:
1144 brelse(eb_bh);
1145 return ret;
1146 }
1147
1148 enum ocfs2_ref_rec_contig {
1149 REF_CONTIG_NONE = 0,
1150 REF_CONTIG_LEFT,
1151 REF_CONTIG_RIGHT,
1152 REF_CONTIG_LEFTRIGHT,
1153 };
1154
1155 static enum ocfs2_ref_rec_contig
1156 ocfs2_refcount_rec_adjacent(struct ocfs2_refcount_block *rb,
1157 int index)
1158 {
1159 if ((rb->rf_records.rl_recs[index].r_refcount ==
1160 rb->rf_records.rl_recs[index + 1].r_refcount) &&
1161 (le64_to_cpu(rb->rf_records.rl_recs[index].r_cpos) +
1162 le32_to_cpu(rb->rf_records.rl_recs[index].r_clusters) ==
1163 le64_to_cpu(rb->rf_records.rl_recs[index + 1].r_cpos)))
1164 return REF_CONTIG_RIGHT;
1165
1166 return REF_CONTIG_NONE;
1167 }
1168
1169 static enum ocfs2_ref_rec_contig
1170 ocfs2_refcount_rec_contig(struct ocfs2_refcount_block *rb,
1171 int index)
1172 {
1173 enum ocfs2_ref_rec_contig ret = REF_CONTIG_NONE;
1174
1175 if (index < le16_to_cpu(rb->rf_records.rl_used) - 1)
1176 ret = ocfs2_refcount_rec_adjacent(rb, index);
1177
1178 if (index > 0) {
1179 enum ocfs2_ref_rec_contig tmp;
1180
1181 tmp = ocfs2_refcount_rec_adjacent(rb, index - 1);
1182
1183 if (tmp == REF_CONTIG_RIGHT) {
1184 if (ret == REF_CONTIG_RIGHT)
1185 ret = REF_CONTIG_LEFTRIGHT;
1186 else
1187 ret = REF_CONTIG_LEFT;
1188 }
1189 }
1190
1191 return ret;
1192 }
1193
1194 static void ocfs2_rotate_refcount_rec_left(struct ocfs2_refcount_block *rb,
1195 int index)
1196 {
1197 BUG_ON(rb->rf_records.rl_recs[index].r_refcount !=
1198 rb->rf_records.rl_recs[index+1].r_refcount);
1199
1200 le32_add_cpu(&rb->rf_records.rl_recs[index].r_clusters,
1201 le32_to_cpu(rb->rf_records.rl_recs[index+1].r_clusters));
1202
1203 if (index < le16_to_cpu(rb->rf_records.rl_used) - 2)
1204 memmove(&rb->rf_records.rl_recs[index + 1],
1205 &rb->rf_records.rl_recs[index + 2],
1206 sizeof(struct ocfs2_refcount_rec) *
1207 (le16_to_cpu(rb->rf_records.rl_used) - index - 2));
1208
1209 memset(&rb->rf_records.rl_recs[le16_to_cpu(rb->rf_records.rl_used) - 1],
1210 0, sizeof(struct ocfs2_refcount_rec));
1211 le16_add_cpu(&rb->rf_records.rl_used, -1);
1212 }
1213
1214 /*
1215 * Merge the refcount rec if we are contiguous with the adjacent recs.
1216 */
1217 static void ocfs2_refcount_rec_merge(struct ocfs2_refcount_block *rb,
1218 int index)
1219 {
1220 enum ocfs2_ref_rec_contig contig =
1221 ocfs2_refcount_rec_contig(rb, index);
1222
1223 if (contig == REF_CONTIG_NONE)
1224 return;
1225
1226 if (contig == REF_CONTIG_LEFT || contig == REF_CONTIG_LEFTRIGHT) {
1227 BUG_ON(index == 0);
1228 index--;
1229 }
1230
1231 ocfs2_rotate_refcount_rec_left(rb, index);
1232
1233 if (contig == REF_CONTIG_LEFTRIGHT)
1234 ocfs2_rotate_refcount_rec_left(rb, index);
1235 }
1236
1237 /*
1238 * Change the refcount indexed by "index" in ref_bh.
1239 * If refcount reaches 0, remove it.
1240 */
1241 static int ocfs2_change_refcount_rec(handle_t *handle,
1242 struct ocfs2_caching_info *ci,
1243 struct buffer_head *ref_leaf_bh,
1244 int index, int merge, int change)
1245 {
1246 int ret;
1247 struct ocfs2_refcount_block *rb =
1248 (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
1249 struct ocfs2_refcount_list *rl = &rb->rf_records;
1250 struct ocfs2_refcount_rec *rec = &rl->rl_recs[index];
1251
1252 ret = ocfs2_journal_access_rb(handle, ci, ref_leaf_bh,
1253 OCFS2_JOURNAL_ACCESS_WRITE);
1254 if (ret) {
1255 mlog_errno(ret);
1256 goto out;
1257 }
1258
1259 mlog(0, "change index %d, old count %u, change %d\n", index,
1260 le32_to_cpu(rec->r_refcount), change);
1261 le32_add_cpu(&rec->r_refcount, change);
1262
1263 if (!rec->r_refcount) {
1264 if (index != le16_to_cpu(rl->rl_used) - 1) {
1265 memmove(rec, rec + 1,
1266 (le16_to_cpu(rl->rl_used) - index - 1) *
1267 sizeof(struct ocfs2_refcount_rec));
1268 memset(&rl->rl_recs[le16_to_cpu(rl->rl_used) - 1],
1269 0, sizeof(struct ocfs2_refcount_rec));
1270 }
1271
1272 le16_add_cpu(&rl->rl_used, -1);
1273 } else if (merge)
1274 ocfs2_refcount_rec_merge(rb, index);
1275
1276 ocfs2_journal_dirty(handle, ref_leaf_bh);
1277 out:
1278 return ret;
1279 }
1280
1281 static int ocfs2_expand_inline_ref_root(handle_t *handle,
1282 struct ocfs2_caching_info *ci,
1283 struct buffer_head *ref_root_bh,
1284 struct buffer_head **ref_leaf_bh,
1285 struct ocfs2_alloc_context *meta_ac)
1286 {
1287 int ret;
1288 u16 suballoc_bit_start;
1289 u32 num_got;
1290 u64 suballoc_loc, blkno;
1291 struct super_block *sb = ocfs2_metadata_cache_get_super(ci);
1292 struct buffer_head *new_bh = NULL;
1293 struct ocfs2_refcount_block *new_rb;
1294 struct ocfs2_refcount_block *root_rb =
1295 (struct ocfs2_refcount_block *)ref_root_bh->b_data;
1296
1297 ret = ocfs2_journal_access_rb(handle, ci, ref_root_bh,
1298 OCFS2_JOURNAL_ACCESS_WRITE);
1299 if (ret) {
1300 mlog_errno(ret);
1301 goto out;
1302 }
1303
1304 ret = ocfs2_claim_metadata(handle, meta_ac, 1, &suballoc_loc,
1305 &suballoc_bit_start, &num_got,
1306 &blkno);
1307 if (ret) {
1308 mlog_errno(ret);
1309 goto out;
1310 }
1311
1312 new_bh = sb_getblk(sb, blkno);
1313 if (new_bh == NULL) {
1314 ret = -EIO;
1315 mlog_errno(ret);
1316 goto out;
1317 }
1318 ocfs2_set_new_buffer_uptodate(ci, new_bh);
1319
1320 ret = ocfs2_journal_access_rb(handle, ci, new_bh,
1321 OCFS2_JOURNAL_ACCESS_CREATE);
1322 if (ret) {
1323 mlog_errno(ret);
1324 goto out;
1325 }
1326
1327 /*
1328 * Initialize ocfs2_refcount_block.
1329 * It should contain the same information as the old root.
1330 * so just memcpy it and change the corresponding field.
1331 */
1332 memcpy(new_bh->b_data, ref_root_bh->b_data, sb->s_blocksize);
1333
1334 new_rb = (struct ocfs2_refcount_block *)new_bh->b_data;
1335 new_rb->rf_suballoc_slot = cpu_to_le16(meta_ac->ac_alloc_slot);
1336 new_rb->rf_suballoc_loc = cpu_to_le64(suballoc_loc);
1337 new_rb->rf_suballoc_bit = cpu_to_le16(suballoc_bit_start);
1338 new_rb->rf_blkno = cpu_to_le64(blkno);
1339 new_rb->rf_cpos = cpu_to_le32(0);
1340 new_rb->rf_parent = cpu_to_le64(ref_root_bh->b_blocknr);
1341 new_rb->rf_flags = cpu_to_le32(OCFS2_REFCOUNT_LEAF_FL);
1342 ocfs2_journal_dirty(handle, new_bh);
1343
1344 /* Now change the root. */
1345 memset(&root_rb->rf_list, 0, sb->s_blocksize -
1346 offsetof(struct ocfs2_refcount_block, rf_list));
1347 root_rb->rf_list.l_count = cpu_to_le16(ocfs2_extent_recs_per_rb(sb));
1348 root_rb->rf_clusters = cpu_to_le32(1);
1349 root_rb->rf_list.l_next_free_rec = cpu_to_le16(1);
1350 root_rb->rf_list.l_recs[0].e_blkno = cpu_to_le64(blkno);
1351 root_rb->rf_list.l_recs[0].e_leaf_clusters = cpu_to_le16(1);
1352 root_rb->rf_flags = cpu_to_le32(OCFS2_REFCOUNT_TREE_FL);
1353
1354 ocfs2_journal_dirty(handle, ref_root_bh);
1355
1356 mlog(0, "new leaf block %llu, used %u\n", (unsigned long long)blkno,
1357 le16_to_cpu(new_rb->rf_records.rl_used));
1358
1359 *ref_leaf_bh = new_bh;
1360 new_bh = NULL;
1361 out:
1362 brelse(new_bh);
1363 return ret;
1364 }
1365
1366 static int ocfs2_refcount_rec_no_intersect(struct ocfs2_refcount_rec *prev,
1367 struct ocfs2_refcount_rec *next)
1368 {
1369 if (ocfs2_get_ref_rec_low_cpos(prev) + le32_to_cpu(prev->r_clusters) <=
1370 ocfs2_get_ref_rec_low_cpos(next))
1371 return 1;
1372
1373 return 0;
1374 }
1375
1376 static int cmp_refcount_rec_by_low_cpos(const void *a, const void *b)
1377 {
1378 const struct ocfs2_refcount_rec *l = a, *r = b;
1379 u32 l_cpos = ocfs2_get_ref_rec_low_cpos(l);
1380 u32 r_cpos = ocfs2_get_ref_rec_low_cpos(r);
1381
1382 if (l_cpos > r_cpos)
1383 return 1;
1384 if (l_cpos < r_cpos)
1385 return -1;
1386 return 0;
1387 }
1388
1389 static int cmp_refcount_rec_by_cpos(const void *a, const void *b)
1390 {
1391 const struct ocfs2_refcount_rec *l = a, *r = b;
1392 u64 l_cpos = le64_to_cpu(l->r_cpos);
1393 u64 r_cpos = le64_to_cpu(r->r_cpos);
1394
1395 if (l_cpos > r_cpos)
1396 return 1;
1397 if (l_cpos < r_cpos)
1398 return -1;
1399 return 0;
1400 }
1401
1402 static void swap_refcount_rec(void *a, void *b, int size)
1403 {
1404 struct ocfs2_refcount_rec *l = a, *r = b, tmp;
1405
1406 tmp = *(struct ocfs2_refcount_rec *)l;
1407 *(struct ocfs2_refcount_rec *)l =
1408 *(struct ocfs2_refcount_rec *)r;
1409 *(struct ocfs2_refcount_rec *)r = tmp;
1410 }
1411
1412 /*
1413 * The refcount cpos are ordered by their 64bit cpos,
1414 * But we will use the low 32 bit to be the e_cpos in the b-tree.
1415 * So we need to make sure that this pos isn't intersected with others.
1416 *
1417 * Note: The refcount block is already sorted by their low 32 bit cpos,
1418 * So just try the middle pos first, and we will exit when we find
1419 * the good position.
1420 */
1421 static int ocfs2_find_refcount_split_pos(struct ocfs2_refcount_list *rl,
1422 u32 *split_pos, int *split_index)
1423 {
1424 int num_used = le16_to_cpu(rl->rl_used);
1425 int delta, middle = num_used / 2;
1426
1427 for (delta = 0; delta < middle; delta++) {
1428 /* Let's check delta earlier than middle */
1429 if (ocfs2_refcount_rec_no_intersect(
1430 &rl->rl_recs[middle - delta - 1],
1431 &rl->rl_recs[middle - delta])) {
1432 *split_index = middle - delta;
1433 break;
1434 }
1435
1436 /* For even counts, don't walk off the end */
1437 if ((middle + delta + 1) == num_used)
1438 continue;
1439
1440 /* Now try delta past middle */
1441 if (ocfs2_refcount_rec_no_intersect(
1442 &rl->rl_recs[middle + delta],
1443 &rl->rl_recs[middle + delta + 1])) {
1444 *split_index = middle + delta + 1;
1445 break;
1446 }
1447 }
1448
1449 if (delta >= middle)
1450 return -ENOSPC;
1451
1452 *split_pos = ocfs2_get_ref_rec_low_cpos(&rl->rl_recs[*split_index]);
1453 return 0;
1454 }
1455
1456 static int ocfs2_divide_leaf_refcount_block(struct buffer_head *ref_leaf_bh,
1457 struct buffer_head *new_bh,
1458 u32 *split_cpos)
1459 {
1460 int split_index = 0, num_moved, ret;
1461 u32 cpos = 0;
1462 struct ocfs2_refcount_block *rb =
1463 (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
1464 struct ocfs2_refcount_list *rl = &rb->rf_records;
1465 struct ocfs2_refcount_block *new_rb =
1466 (struct ocfs2_refcount_block *)new_bh->b_data;
1467 struct ocfs2_refcount_list *new_rl = &new_rb->rf_records;
1468
1469 mlog(0, "split old leaf refcount block %llu, count = %u, used = %u\n",
1470 (unsigned long long)ref_leaf_bh->b_blocknr,
1471 le32_to_cpu(rl->rl_count), le32_to_cpu(rl->rl_used));
1472
1473 /*
1474 * XXX: Improvement later.
1475 * If we know all the high 32 bit cpos is the same, no need to sort.
1476 *
1477 * In order to make the whole process safe, we do:
1478 * 1. sort the entries by their low 32 bit cpos first so that we can
1479 * find the split cpos easily.
1480 * 2. call ocfs2_insert_extent to insert the new refcount block.
1481 * 3. move the refcount rec to the new block.
1482 * 4. sort the entries by their 64 bit cpos.
1483 * 5. dirty the new_rb and rb.
1484 */
1485 sort(&rl->rl_recs, le16_to_cpu(rl->rl_used),
1486 sizeof(struct ocfs2_refcount_rec),
1487 cmp_refcount_rec_by_low_cpos, swap_refcount_rec);
1488
1489 ret = ocfs2_find_refcount_split_pos(rl, &cpos, &split_index);
1490 if (ret) {
1491 mlog_errno(ret);
1492 return ret;
1493 }
1494
1495 new_rb->rf_cpos = cpu_to_le32(cpos);
1496
1497 /* move refcount records starting from split_index to the new block. */
1498 num_moved = le16_to_cpu(rl->rl_used) - split_index;
1499 memcpy(new_rl->rl_recs, &rl->rl_recs[split_index],
1500 num_moved * sizeof(struct ocfs2_refcount_rec));
1501
1502 /*ok, remove the entries we just moved over to the other block. */
1503 memset(&rl->rl_recs[split_index], 0,
1504 num_moved * sizeof(struct ocfs2_refcount_rec));
1505
1506 /* change old and new rl_used accordingly. */
1507 le16_add_cpu(&rl->rl_used, -num_moved);
1508 new_rl->rl_used = cpu_to_le16(num_moved);
1509
1510 sort(&rl->rl_recs, le16_to_cpu(rl->rl_used),
1511 sizeof(struct ocfs2_refcount_rec),
1512 cmp_refcount_rec_by_cpos, swap_refcount_rec);
1513
1514 sort(&new_rl->rl_recs, le16_to_cpu(new_rl->rl_used),
1515 sizeof(struct ocfs2_refcount_rec),
1516 cmp_refcount_rec_by_cpos, swap_refcount_rec);
1517
1518 *split_cpos = cpos;
1519 return 0;
1520 }
1521
1522 static int ocfs2_new_leaf_refcount_block(handle_t *handle,
1523 struct ocfs2_caching_info *ci,
1524 struct buffer_head *ref_root_bh,
1525 struct buffer_head *ref_leaf_bh,
1526 struct ocfs2_alloc_context *meta_ac)
1527 {
1528 int ret;
1529 u16 suballoc_bit_start;
1530 u32 num_got, new_cpos;
1531 u64 suballoc_loc, blkno;
1532 struct super_block *sb = ocfs2_metadata_cache_get_super(ci);
1533 struct ocfs2_refcount_block *root_rb =
1534 (struct ocfs2_refcount_block *)ref_root_bh->b_data;
1535 struct buffer_head *new_bh = NULL;
1536 struct ocfs2_refcount_block *new_rb;
1537 struct ocfs2_extent_tree ref_et;
1538
1539 BUG_ON(!(le32_to_cpu(root_rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL));
1540
1541 ret = ocfs2_journal_access_rb(handle, ci, ref_root_bh,
1542 OCFS2_JOURNAL_ACCESS_WRITE);
1543 if (ret) {
1544 mlog_errno(ret);
1545 goto out;
1546 }
1547
1548 ret = ocfs2_journal_access_rb(handle, ci, ref_leaf_bh,
1549 OCFS2_JOURNAL_ACCESS_WRITE);
1550 if (ret) {
1551 mlog_errno(ret);
1552 goto out;
1553 }
1554
1555 ret = ocfs2_claim_metadata(handle, meta_ac, 1, &suballoc_loc,
1556 &suballoc_bit_start, &num_got,
1557 &blkno);
1558 if (ret) {
1559 mlog_errno(ret);
1560 goto out;
1561 }
1562
1563 new_bh = sb_getblk(sb, blkno);
1564 if (new_bh == NULL) {
1565 ret = -EIO;
1566 mlog_errno(ret);
1567 goto out;
1568 }
1569 ocfs2_set_new_buffer_uptodate(ci, new_bh);
1570
1571 ret = ocfs2_journal_access_rb(handle, ci, new_bh,
1572 OCFS2_JOURNAL_ACCESS_CREATE);
1573 if (ret) {
1574 mlog_errno(ret);
1575 goto out;
1576 }
1577
1578 /* Initialize ocfs2_refcount_block. */
1579 new_rb = (struct ocfs2_refcount_block *)new_bh->b_data;
1580 memset(new_rb, 0, sb->s_blocksize);
1581 strcpy((void *)new_rb, OCFS2_REFCOUNT_BLOCK_SIGNATURE);
1582 new_rb->rf_suballoc_slot = cpu_to_le16(meta_ac->ac_alloc_slot);
1583 new_rb->rf_suballoc_loc = cpu_to_le64(suballoc_loc);
1584 new_rb->rf_suballoc_bit = cpu_to_le16(suballoc_bit_start);
1585 new_rb->rf_fs_generation = cpu_to_le32(OCFS2_SB(sb)->fs_generation);
1586 new_rb->rf_blkno = cpu_to_le64(blkno);
1587 new_rb->rf_parent = cpu_to_le64(ref_root_bh->b_blocknr);
1588 new_rb->rf_flags = cpu_to_le32(OCFS2_REFCOUNT_LEAF_FL);
1589 new_rb->rf_records.rl_count =
1590 cpu_to_le16(ocfs2_refcount_recs_per_rb(sb));
1591 new_rb->rf_generation = root_rb->rf_generation;
1592
1593 ret = ocfs2_divide_leaf_refcount_block(ref_leaf_bh, new_bh, &new_cpos);
1594 if (ret) {
1595 mlog_errno(ret);
1596 goto out;
1597 }
1598
1599 ocfs2_journal_dirty(handle, ref_leaf_bh);
1600 ocfs2_journal_dirty(handle, new_bh);
1601
1602 ocfs2_init_refcount_extent_tree(&ref_et, ci, ref_root_bh);
1603
1604 mlog(0, "insert new leaf block %llu at %u\n",
1605 (unsigned long long)new_bh->b_blocknr, new_cpos);
1606
1607 /* Insert the new leaf block with the specific offset cpos. */
1608 ret = ocfs2_insert_extent(handle, &ref_et, new_cpos, new_bh->b_blocknr,
1609 1, 0, meta_ac);
1610 if (ret)
1611 mlog_errno(ret);
1612
1613 out:
1614 brelse(new_bh);
1615 return ret;
1616 }
1617
1618 static int ocfs2_expand_refcount_tree(handle_t *handle,
1619 struct ocfs2_caching_info *ci,
1620 struct buffer_head *ref_root_bh,
1621 struct buffer_head *ref_leaf_bh,
1622 struct ocfs2_alloc_context *meta_ac)
1623 {
1624 int ret;
1625 struct buffer_head *expand_bh = NULL;
1626
1627 if (ref_root_bh == ref_leaf_bh) {
1628 /*
1629 * the old root bh hasn't been expanded to a b-tree,
1630 * so expand it first.
1631 */
1632 ret = ocfs2_expand_inline_ref_root(handle, ci, ref_root_bh,
1633 &expand_bh, meta_ac);
1634 if (ret) {
1635 mlog_errno(ret);
1636 goto out;
1637 }
1638 } else {
1639 expand_bh = ref_leaf_bh;
1640 get_bh(expand_bh);
1641 }
1642
1643
1644 /* Now add a new refcount block into the tree.*/
1645 ret = ocfs2_new_leaf_refcount_block(handle, ci, ref_root_bh,
1646 expand_bh, meta_ac);
1647 if (ret)
1648 mlog_errno(ret);
1649 out:
1650 brelse(expand_bh);
1651 return ret;
1652 }
1653
1654 /*
1655 * Adjust the extent rec in b-tree representing ref_leaf_bh.
1656 *
1657 * Only called when we have inserted a new refcount rec at index 0
1658 * which means ocfs2_extent_rec.e_cpos may need some change.
1659 */
1660 static int ocfs2_adjust_refcount_rec(handle_t *handle,
1661 struct ocfs2_caching_info *ci,
1662 struct buffer_head *ref_root_bh,
1663 struct buffer_head *ref_leaf_bh,
1664 struct ocfs2_refcount_rec *rec)
1665 {
1666 int ret = 0, i;
1667 u32 new_cpos, old_cpos;
1668 struct ocfs2_path *path = NULL;
1669 struct ocfs2_extent_tree et;
1670 struct ocfs2_refcount_block *rb =
1671 (struct ocfs2_refcount_block *)ref_root_bh->b_data;
1672 struct ocfs2_extent_list *el;
1673
1674 if (!(le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL))
1675 goto out;
1676
1677 rb = (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
1678 old_cpos = le32_to_cpu(rb->rf_cpos);
1679 new_cpos = le64_to_cpu(rec->r_cpos) & OCFS2_32BIT_POS_MASK;
1680 if (old_cpos <= new_cpos)
1681 goto out;
1682
1683 ocfs2_init_refcount_extent_tree(&et, ci, ref_root_bh);
1684
1685 path = ocfs2_new_path_from_et(&et);
1686 if (!path) {
1687 ret = -ENOMEM;
1688 mlog_errno(ret);
1689 goto out;
1690 }
1691
1692 ret = ocfs2_find_path(ci, path, old_cpos);
1693 if (ret) {
1694 mlog_errno(ret);
1695 goto out;
1696 }
1697
1698 /*
1699 * 2 more credits, one for the leaf refcount block, one for
1700 * the extent block contains the extent rec.
1701 */
1702 ret = ocfs2_extend_trans(handle, 2);
1703 if (ret < 0) {
1704 mlog_errno(ret);
1705 goto out;
1706 }
1707
1708 ret = ocfs2_journal_access_rb(handle, ci, ref_leaf_bh,
1709 OCFS2_JOURNAL_ACCESS_WRITE);
1710 if (ret < 0) {
1711 mlog_errno(ret);
1712 goto out;
1713 }
1714
1715 ret = ocfs2_journal_access_eb(handle, ci, path_leaf_bh(path),
1716 OCFS2_JOURNAL_ACCESS_WRITE);
1717 if (ret < 0) {
1718 mlog_errno(ret);
1719 goto out;
1720 }
1721
1722 /* change the leaf extent block first. */
1723 el = path_leaf_el(path);
1724
1725 for (i = 0; i < le16_to_cpu(el->l_next_free_rec); i++)
1726 if (le32_to_cpu(el->l_recs[i].e_cpos) == old_cpos)
1727 break;
1728
1729 BUG_ON(i == le16_to_cpu(el->l_next_free_rec));
1730
1731 el->l_recs[i].e_cpos = cpu_to_le32(new_cpos);
1732
1733 /* change the r_cpos in the leaf block. */
1734 rb->rf_cpos = cpu_to_le32(new_cpos);
1735
1736 ocfs2_journal_dirty(handle, path_leaf_bh(path));
1737 ocfs2_journal_dirty(handle, ref_leaf_bh);
1738
1739 out:
1740 ocfs2_free_path(path);
1741 return ret;
1742 }
1743
1744 static int ocfs2_insert_refcount_rec(handle_t *handle,
1745 struct ocfs2_caching_info *ci,
1746 struct buffer_head *ref_root_bh,
1747 struct buffer_head *ref_leaf_bh,
1748 struct ocfs2_refcount_rec *rec,
1749 int index, int merge,
1750 struct ocfs2_alloc_context *meta_ac)
1751 {
1752 int ret;
1753 struct ocfs2_refcount_block *rb =
1754 (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
1755 struct ocfs2_refcount_list *rf_list = &rb->rf_records;
1756 struct buffer_head *new_bh = NULL;
1757
1758 BUG_ON(le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL);
1759
1760 if (rf_list->rl_used == rf_list->rl_count) {
1761 u64 cpos = le64_to_cpu(rec->r_cpos);
1762 u32 len = le32_to_cpu(rec->r_clusters);
1763
1764 ret = ocfs2_expand_refcount_tree(handle, ci, ref_root_bh,
1765 ref_leaf_bh, meta_ac);
1766 if (ret) {
1767 mlog_errno(ret);
1768 goto out;
1769 }
1770
1771 ret = ocfs2_get_refcount_rec(ci, ref_root_bh,
1772 cpos, len, NULL, &index,
1773 &new_bh);
1774 if (ret) {
1775 mlog_errno(ret);
1776 goto out;
1777 }
1778
1779 ref_leaf_bh = new_bh;
1780 rb = (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
1781 rf_list = &rb->rf_records;
1782 }
1783
1784 ret = ocfs2_journal_access_rb(handle, ci, ref_leaf_bh,
1785 OCFS2_JOURNAL_ACCESS_WRITE);
1786 if (ret) {
1787 mlog_errno(ret);
1788 goto out;
1789 }
1790
1791 if (index < le16_to_cpu(rf_list->rl_used))
1792 memmove(&rf_list->rl_recs[index + 1],
1793 &rf_list->rl_recs[index],
1794 (le16_to_cpu(rf_list->rl_used) - index) *
1795 sizeof(struct ocfs2_refcount_rec));
1796
1797 mlog(0, "insert refcount record start %llu, len %u, count %u "
1798 "to leaf block %llu at index %d\n",
1799 (unsigned long long)le64_to_cpu(rec->r_cpos),
1800 le32_to_cpu(rec->r_clusters), le32_to_cpu(rec->r_refcount),
1801 (unsigned long long)ref_leaf_bh->b_blocknr, index);
1802
1803 rf_list->rl_recs[index] = *rec;
1804
1805 le16_add_cpu(&rf_list->rl_used, 1);
1806
1807 if (merge)
1808 ocfs2_refcount_rec_merge(rb, index);
1809
1810 ocfs2_journal_dirty(handle, ref_leaf_bh);
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 ocfs2_journal_dirty(handle, ref_leaf_bh);
1982
1983 out:
1984 brelse(new_bh);
1985 return ret;
1986 }
1987
1988 static int __ocfs2_increase_refcount(handle_t *handle,
1989 struct ocfs2_caching_info *ci,
1990 struct buffer_head *ref_root_bh,
1991 u64 cpos, u32 len, int merge,
1992 struct ocfs2_alloc_context *meta_ac,
1993 struct ocfs2_cached_dealloc_ctxt *dealloc)
1994 {
1995 int ret = 0, index;
1996 struct buffer_head *ref_leaf_bh = NULL;
1997 struct ocfs2_refcount_rec rec;
1998 unsigned int set_len = 0;
1999
2000 mlog(0, "Tree owner %llu, add refcount start %llu, len %u\n",
2001 (unsigned long long)ocfs2_metadata_cache_owner(ci),
2002 (unsigned long long)cpos, len);
2003
2004 while (len) {
2005 ret = ocfs2_get_refcount_rec(ci, ref_root_bh,
2006 cpos, len, &rec, &index,
2007 &ref_leaf_bh);
2008 if (ret) {
2009 mlog_errno(ret);
2010 goto out;
2011 }
2012
2013 set_len = le32_to_cpu(rec.r_clusters);
2014
2015 /*
2016 * Here we may meet with 3 situations:
2017 *
2018 * 1. If we find an already existing record, and the length
2019 * is the same, cool, we just need to increase the r_refcount
2020 * and it is OK.
2021 * 2. If we find a hole, just insert it with r_refcount = 1.
2022 * 3. If we are in the middle of one extent record, split
2023 * it.
2024 */
2025 if (rec.r_refcount && le64_to_cpu(rec.r_cpos) == cpos &&
2026 set_len <= len) {
2027 mlog(0, "increase refcount rec, start %llu, len %u, "
2028 "count %u\n", (unsigned long long)cpos, set_len,
2029 le32_to_cpu(rec.r_refcount));
2030 ret = ocfs2_change_refcount_rec(handle, ci,
2031 ref_leaf_bh, index,
2032 merge, 1);
2033 if (ret) {
2034 mlog_errno(ret);
2035 goto out;
2036 }
2037 } else if (!rec.r_refcount) {
2038 rec.r_refcount = cpu_to_le32(1);
2039
2040 mlog(0, "insert refcount rec, start %llu, len %u\n",
2041 (unsigned long long)le64_to_cpu(rec.r_cpos),
2042 set_len);
2043 ret = ocfs2_insert_refcount_rec(handle, ci, ref_root_bh,
2044 ref_leaf_bh,
2045 &rec, index,
2046 merge, meta_ac);
2047 if (ret) {
2048 mlog_errno(ret);
2049 goto out;
2050 }
2051 } else {
2052 set_len = min((u64)(cpos + len),
2053 le64_to_cpu(rec.r_cpos) + set_len) - cpos;
2054 rec.r_cpos = cpu_to_le64(cpos);
2055 rec.r_clusters = cpu_to_le32(set_len);
2056 le32_add_cpu(&rec.r_refcount, 1);
2057
2058 mlog(0, "split refcount rec, start %llu, "
2059 "len %u, count %u\n",
2060 (unsigned long long)le64_to_cpu(rec.r_cpos),
2061 set_len, le32_to_cpu(rec.r_refcount));
2062 ret = ocfs2_split_refcount_rec(handle, ci,
2063 ref_root_bh, ref_leaf_bh,
2064 &rec, index, merge,
2065 meta_ac, dealloc);
2066 if (ret) {
2067 mlog_errno(ret);
2068 goto out;
2069 }
2070 }
2071
2072 cpos += set_len;
2073 len -= set_len;
2074 brelse(ref_leaf_bh);
2075 ref_leaf_bh = NULL;
2076 }
2077
2078 out:
2079 brelse(ref_leaf_bh);
2080 return ret;
2081 }
2082
2083 static int ocfs2_remove_refcount_extent(handle_t *handle,
2084 struct ocfs2_caching_info *ci,
2085 struct buffer_head *ref_root_bh,
2086 struct buffer_head *ref_leaf_bh,
2087 struct ocfs2_alloc_context *meta_ac,
2088 struct ocfs2_cached_dealloc_ctxt *dealloc)
2089 {
2090 int ret;
2091 struct super_block *sb = ocfs2_metadata_cache_get_super(ci);
2092 struct ocfs2_refcount_block *rb =
2093 (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
2094 struct ocfs2_extent_tree et;
2095
2096 BUG_ON(rb->rf_records.rl_used);
2097
2098 ocfs2_init_refcount_extent_tree(&et, ci, ref_root_bh);
2099 ret = ocfs2_remove_extent(handle, &et, le32_to_cpu(rb->rf_cpos),
2100 1, meta_ac, dealloc);
2101 if (ret) {
2102 mlog_errno(ret);
2103 goto out;
2104 }
2105
2106 ocfs2_remove_from_cache(ci, ref_leaf_bh);
2107
2108 /*
2109 * add the freed block to the dealloc so that it will be freed
2110 * when we run dealloc.
2111 */
2112 ret = ocfs2_cache_block_dealloc(dealloc, EXTENT_ALLOC_SYSTEM_INODE,
2113 le16_to_cpu(rb->rf_suballoc_slot),
2114 le64_to_cpu(rb->rf_suballoc_loc),
2115 le64_to_cpu(rb->rf_blkno),
2116 le16_to_cpu(rb->rf_suballoc_bit));
2117 if (ret) {
2118 mlog_errno(ret);
2119 goto out;
2120 }
2121
2122 ret = ocfs2_journal_access_rb(handle, ci, ref_root_bh,
2123 OCFS2_JOURNAL_ACCESS_WRITE);
2124 if (ret) {
2125 mlog_errno(ret);
2126 goto out;
2127 }
2128
2129 rb = (struct ocfs2_refcount_block *)ref_root_bh->b_data;
2130
2131 le32_add_cpu(&rb->rf_clusters, -1);
2132
2133 /*
2134 * check whether we need to restore the root refcount block if
2135 * there is no leaf extent block at atll.
2136 */
2137 if (!rb->rf_list.l_next_free_rec) {
2138 BUG_ON(rb->rf_clusters);
2139
2140 mlog(0, "reset refcount tree root %llu to be a record block.\n",
2141 (unsigned long long)ref_root_bh->b_blocknr);
2142
2143 rb->rf_flags = 0;
2144 rb->rf_parent = 0;
2145 rb->rf_cpos = 0;
2146 memset(&rb->rf_records, 0, sb->s_blocksize -
2147 offsetof(struct ocfs2_refcount_block, rf_records));
2148 rb->rf_records.rl_count =
2149 cpu_to_le16(ocfs2_refcount_recs_per_rb(sb));
2150 }
2151
2152 ocfs2_journal_dirty(handle, ref_root_bh);
2153
2154 out:
2155 return ret;
2156 }
2157
2158 int ocfs2_increase_refcount(handle_t *handle,
2159 struct ocfs2_caching_info *ci,
2160 struct buffer_head *ref_root_bh,
2161 u64 cpos, u32 len,
2162 struct ocfs2_alloc_context *meta_ac,
2163 struct ocfs2_cached_dealloc_ctxt *dealloc)
2164 {
2165 return __ocfs2_increase_refcount(handle, ci, ref_root_bh,
2166 cpos, len, 1,
2167 meta_ac, dealloc);
2168 }
2169
2170 static int ocfs2_decrease_refcount_rec(handle_t *handle,
2171 struct ocfs2_caching_info *ci,
2172 struct buffer_head *ref_root_bh,
2173 struct buffer_head *ref_leaf_bh,
2174 int index, u64 cpos, unsigned int len,
2175 struct ocfs2_alloc_context *meta_ac,
2176 struct ocfs2_cached_dealloc_ctxt *dealloc)
2177 {
2178 int ret;
2179 struct ocfs2_refcount_block *rb =
2180 (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
2181 struct ocfs2_refcount_rec *rec = &rb->rf_records.rl_recs[index];
2182
2183 BUG_ON(cpos < le64_to_cpu(rec->r_cpos));
2184 BUG_ON(cpos + len >
2185 le64_to_cpu(rec->r_cpos) + le32_to_cpu(rec->r_clusters));
2186
2187 if (cpos == le64_to_cpu(rec->r_cpos) &&
2188 len == le32_to_cpu(rec->r_clusters))
2189 ret = ocfs2_change_refcount_rec(handle, ci,
2190 ref_leaf_bh, index, 1, -1);
2191 else {
2192 struct ocfs2_refcount_rec split = *rec;
2193 split.r_cpos = cpu_to_le64(cpos);
2194 split.r_clusters = cpu_to_le32(len);
2195
2196 le32_add_cpu(&split.r_refcount, -1);
2197
2198 mlog(0, "split refcount rec, start %llu, "
2199 "len %u, count %u, original start %llu, len %u\n",
2200 (unsigned long long)le64_to_cpu(split.r_cpos),
2201 len, le32_to_cpu(split.r_refcount),
2202 (unsigned long long)le64_to_cpu(rec->r_cpos),
2203 le32_to_cpu(rec->r_clusters));
2204 ret = ocfs2_split_refcount_rec(handle, ci,
2205 ref_root_bh, ref_leaf_bh,
2206 &split, index, 1,
2207 meta_ac, dealloc);
2208 }
2209
2210 if (ret) {
2211 mlog_errno(ret);
2212 goto out;
2213 }
2214
2215 /* Remove the leaf refcount block if it contains no refcount record. */
2216 if (!rb->rf_records.rl_used && ref_leaf_bh != ref_root_bh) {
2217 ret = ocfs2_remove_refcount_extent(handle, ci, ref_root_bh,
2218 ref_leaf_bh, meta_ac,
2219 dealloc);
2220 if (ret)
2221 mlog_errno(ret);
2222 }
2223
2224 out:
2225 return ret;
2226 }
2227
2228 static int __ocfs2_decrease_refcount(handle_t *handle,
2229 struct ocfs2_caching_info *ci,
2230 struct buffer_head *ref_root_bh,
2231 u64 cpos, u32 len,
2232 struct ocfs2_alloc_context *meta_ac,
2233 struct ocfs2_cached_dealloc_ctxt *dealloc,
2234 int delete)
2235 {
2236 int ret = 0, index = 0;
2237 struct ocfs2_refcount_rec rec;
2238 unsigned int r_count = 0, r_len;
2239 struct super_block *sb = ocfs2_metadata_cache_get_super(ci);
2240 struct buffer_head *ref_leaf_bh = NULL;
2241
2242 mlog(0, "Tree owner %llu, decrease refcount start %llu, "
2243 "len %u, delete %u\n",
2244 (unsigned long long)ocfs2_metadata_cache_owner(ci),
2245 (unsigned long long)cpos, len, delete);
2246
2247 while (len) {
2248 ret = ocfs2_get_refcount_rec(ci, ref_root_bh,
2249 cpos, len, &rec, &index,
2250 &ref_leaf_bh);
2251 if (ret) {
2252 mlog_errno(ret);
2253 goto out;
2254 }
2255
2256 r_count = le32_to_cpu(rec.r_refcount);
2257 BUG_ON(r_count == 0);
2258 if (!delete)
2259 BUG_ON(r_count > 1);
2260
2261 r_len = min((u64)(cpos + len), le64_to_cpu(rec.r_cpos) +
2262 le32_to_cpu(rec.r_clusters)) - cpos;
2263
2264 ret = ocfs2_decrease_refcount_rec(handle, ci, ref_root_bh,
2265 ref_leaf_bh, index,
2266 cpos, r_len,
2267 meta_ac, dealloc);
2268 if (ret) {
2269 mlog_errno(ret);
2270 goto out;
2271 }
2272
2273 if (le32_to_cpu(rec.r_refcount) == 1 && delete) {
2274 ret = ocfs2_cache_cluster_dealloc(dealloc,
2275 ocfs2_clusters_to_blocks(sb, cpos),
2276 r_len);
2277 if (ret) {
2278 mlog_errno(ret);
2279 goto out;
2280 }
2281 }
2282
2283 cpos += r_len;
2284 len -= r_len;
2285 brelse(ref_leaf_bh);
2286 ref_leaf_bh = NULL;
2287 }
2288
2289 out:
2290 brelse(ref_leaf_bh);
2291 return ret;
2292 }
2293
2294 /* Caller must hold refcount tree lock. */
2295 int ocfs2_decrease_refcount(struct inode *inode,
2296 handle_t *handle, u32 cpos, u32 len,
2297 struct ocfs2_alloc_context *meta_ac,
2298 struct ocfs2_cached_dealloc_ctxt *dealloc,
2299 int delete)
2300 {
2301 int ret;
2302 u64 ref_blkno;
2303 struct ocfs2_inode_info *oi = OCFS2_I(inode);
2304 struct buffer_head *ref_root_bh = NULL;
2305 struct ocfs2_refcount_tree *tree;
2306
2307 BUG_ON(!(oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL));
2308
2309 ret = ocfs2_get_refcount_block(inode, &ref_blkno);
2310 if (ret) {
2311 mlog_errno(ret);
2312 goto out;
2313 }
2314
2315 ret = ocfs2_get_refcount_tree(OCFS2_SB(inode->i_sb), ref_blkno, &tree);
2316 if (ret) {
2317 mlog_errno(ret);
2318 goto out;
2319 }
2320
2321 ret = ocfs2_read_refcount_block(&tree->rf_ci, tree->rf_blkno,
2322 &ref_root_bh);
2323 if (ret) {
2324 mlog_errno(ret);
2325 goto out;
2326 }
2327
2328 ret = __ocfs2_decrease_refcount(handle, &tree->rf_ci, ref_root_bh,
2329 cpos, len, meta_ac, dealloc, delete);
2330 if (ret)
2331 mlog_errno(ret);
2332 out:
2333 brelse(ref_root_bh);
2334 return ret;
2335 }
2336
2337 /*
2338 * Mark the already-existing extent at cpos as refcounted for len clusters.
2339 * This adds the refcount extent flag.
2340 *
2341 * If the existing extent is larger than the request, initiate a
2342 * split. An attempt will be made at merging with adjacent extents.
2343 *
2344 * The caller is responsible for passing down meta_ac if we'll need it.
2345 */
2346 static int ocfs2_mark_extent_refcounted(struct inode *inode,
2347 struct ocfs2_extent_tree *et,
2348 handle_t *handle, u32 cpos,
2349 u32 len, u32 phys,
2350 struct ocfs2_alloc_context *meta_ac,
2351 struct ocfs2_cached_dealloc_ctxt *dealloc)
2352 {
2353 int ret;
2354
2355 mlog(0, "Inode %lu refcount tree cpos %u, len %u, phys cluster %u\n",
2356 inode->i_ino, cpos, len, phys);
2357
2358 if (!ocfs2_refcount_tree(OCFS2_SB(inode->i_sb))) {
2359 ocfs2_error(inode->i_sb, "Inode %lu want to use refcount "
2360 "tree, but the feature bit is not set in the "
2361 "super block.", inode->i_ino);
2362 ret = -EROFS;
2363 goto out;
2364 }
2365
2366 ret = ocfs2_change_extent_flag(handle, et, cpos,
2367 len, phys, meta_ac, dealloc,
2368 OCFS2_EXT_REFCOUNTED, 0);
2369 if (ret)
2370 mlog_errno(ret);
2371
2372 out:
2373 return ret;
2374 }
2375
2376 /*
2377 * Given some contiguous physical clusters, calculate what we need
2378 * for modifying their refcount.
2379 */
2380 static int ocfs2_calc_refcount_meta_credits(struct super_block *sb,
2381 struct ocfs2_caching_info *ci,
2382 struct buffer_head *ref_root_bh,
2383 u64 start_cpos,
2384 u32 clusters,
2385 int *meta_add,
2386 int *credits)
2387 {
2388 int ret = 0, index, ref_blocks = 0, recs_add = 0;
2389 u64 cpos = start_cpos;
2390 struct ocfs2_refcount_block *rb;
2391 struct ocfs2_refcount_rec rec;
2392 struct buffer_head *ref_leaf_bh = NULL, *prev_bh = NULL;
2393 u32 len;
2394
2395 mlog(0, "start_cpos %llu, clusters %u\n",
2396 (unsigned long long)start_cpos, clusters);
2397 while (clusters) {
2398 ret = ocfs2_get_refcount_rec(ci, ref_root_bh,
2399 cpos, clusters, &rec,
2400 &index, &ref_leaf_bh);
2401 if (ret) {
2402 mlog_errno(ret);
2403 goto out;
2404 }
2405
2406 if (ref_leaf_bh != prev_bh) {
2407 /*
2408 * Now we encounter a new leaf block, so calculate
2409 * whether we need to extend the old leaf.
2410 */
2411 if (prev_bh) {
2412 rb = (struct ocfs2_refcount_block *)
2413 prev_bh->b_data;
2414
2415 if (le64_to_cpu(rb->rf_records.rl_used) +
2416 recs_add >
2417 le16_to_cpu(rb->rf_records.rl_count))
2418 ref_blocks++;
2419 }
2420
2421 recs_add = 0;
2422 *credits += 1;
2423 brelse(prev_bh);
2424 prev_bh = ref_leaf_bh;
2425 get_bh(prev_bh);
2426 }
2427
2428 rb = (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
2429
2430 mlog(0, "recs_add %d,cpos %llu, clusters %u, rec->r_cpos %llu,"
2431 "rec->r_clusters %u, rec->r_refcount %u, index %d\n",
2432 recs_add, (unsigned long long)cpos, clusters,
2433 (unsigned long long)le64_to_cpu(rec.r_cpos),
2434 le32_to_cpu(rec.r_clusters),
2435 le32_to_cpu(rec.r_refcount), index);
2436
2437 len = min((u64)cpos + clusters, le64_to_cpu(rec.r_cpos) +
2438 le32_to_cpu(rec.r_clusters)) - cpos;
2439 /*
2440 * We record all the records which will be inserted to the
2441 * same refcount block, so that we can tell exactly whether
2442 * we need a new refcount block or not.
2443 *
2444 * If we will insert a new one, this is easy and only happens
2445 * during adding refcounted flag to the extent, so we don't
2446 * have a chance of spliting. We just need one record.
2447 *
2448 * If the refcount rec already exists, that would be a little
2449 * complicated. we may have to:
2450 * 1) split at the beginning if the start pos isn't aligned.
2451 * we need 1 more record in this case.
2452 * 2) split int the end if the end pos isn't aligned.
2453 * we need 1 more record in this case.
2454 * 3) split in the middle because of file system fragmentation.
2455 * we need 2 more records in this case(we can't detect this
2456 * beforehand, so always think of the worst case).
2457 */
2458 if (rec.r_refcount) {
2459 recs_add += 2;
2460 /* Check whether we need a split at the beginning. */
2461 if (cpos == start_cpos &&
2462 cpos != le64_to_cpu(rec.r_cpos))
2463 recs_add++;
2464
2465 /* Check whether we need a split in the end. */
2466 if (cpos + clusters < le64_to_cpu(rec.r_cpos) +
2467 le32_to_cpu(rec.r_clusters))
2468 recs_add++;
2469 } else
2470 recs_add++;
2471
2472 brelse(ref_leaf_bh);
2473 ref_leaf_bh = NULL;
2474 clusters -= len;
2475 cpos += len;
2476 }
2477
2478 if (prev_bh) {
2479 rb = (struct ocfs2_refcount_block *)prev_bh->b_data;
2480
2481 if (le64_to_cpu(rb->rf_records.rl_used) + recs_add >
2482 le16_to_cpu(rb->rf_records.rl_count))
2483 ref_blocks++;
2484
2485 *credits += 1;
2486 }
2487
2488 if (!ref_blocks)
2489 goto out;
2490
2491 mlog(0, "we need ref_blocks %d\n", ref_blocks);
2492 *meta_add += ref_blocks;
2493 *credits += ref_blocks;
2494
2495 /*
2496 * So we may need ref_blocks to insert into the tree.
2497 * That also means we need to change the b-tree and add that number
2498 * of records since we never merge them.
2499 * We need one more block for expansion since the new created leaf
2500 * block is also full and needs split.
2501 */
2502 rb = (struct ocfs2_refcount_block *)ref_root_bh->b_data;
2503 if (le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL) {
2504 struct ocfs2_extent_tree et;
2505
2506 ocfs2_init_refcount_extent_tree(&et, ci, ref_root_bh);
2507 *meta_add += ocfs2_extend_meta_needed(et.et_root_el);
2508 *credits += ocfs2_calc_extend_credits(sb,
2509 et.et_root_el,
2510 ref_blocks);
2511 } else {
2512 *credits += OCFS2_EXPAND_REFCOUNT_TREE_CREDITS;
2513 *meta_add += 1;
2514 }
2515
2516 out:
2517 brelse(ref_leaf_bh);
2518 brelse(prev_bh);
2519 return ret;
2520 }
2521
2522 /*
2523 * For refcount tree, we will decrease some contiguous clusters
2524 * refcount count, so just go through it to see how many blocks
2525 * we gonna touch and whether we need to create new blocks.
2526 *
2527 * Normally the refcount blocks store these refcount should be
2528 * contiguous also, so that we can get the number easily.
2529 * We will at most add split 2 refcount records and 2 more
2530 * refcount blocks, so just check it in a rough way.
2531 *
2532 * Caller must hold refcount tree lock.
2533 */
2534 int ocfs2_prepare_refcount_change_for_del(struct inode *inode,
2535 u64 refcount_loc,
2536 u64 phys_blkno,
2537 u32 clusters,
2538 int *credits,
2539 int *ref_blocks)
2540 {
2541 int ret;
2542 struct ocfs2_inode_info *oi = OCFS2_I(inode);
2543 struct buffer_head *ref_root_bh = NULL;
2544 struct ocfs2_refcount_tree *tree;
2545 u64 start_cpos = ocfs2_blocks_to_clusters(inode->i_sb, phys_blkno);
2546
2547 if (!ocfs2_refcount_tree(OCFS2_SB(inode->i_sb))) {
2548 ocfs2_error(inode->i_sb, "Inode %lu want to use refcount "
2549 "tree, but the feature bit is not set in the "
2550 "super block.", inode->i_ino);
2551 ret = -EROFS;
2552 goto out;
2553 }
2554
2555 BUG_ON(!(oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL));
2556
2557 ret = ocfs2_get_refcount_tree(OCFS2_SB(inode->i_sb),
2558 refcount_loc, &tree);
2559 if (ret) {
2560 mlog_errno(ret);
2561 goto out;
2562 }
2563
2564 ret = ocfs2_read_refcount_block(&tree->rf_ci, refcount_loc,
2565 &ref_root_bh);
2566 if (ret) {
2567 mlog_errno(ret);
2568 goto out;
2569 }
2570
2571 ret = ocfs2_calc_refcount_meta_credits(inode->i_sb,
2572 &tree->rf_ci,
2573 ref_root_bh,
2574 start_cpos, clusters,
2575 ref_blocks, credits);
2576 if (ret) {
2577 mlog_errno(ret);
2578 goto out;
2579 }
2580
2581 mlog(0, "reserve new metadata %d blocks, credits = %d\n",
2582 *ref_blocks, *credits);
2583
2584 out:
2585 brelse(ref_root_bh);
2586 return ret;
2587 }
2588
2589 #define MAX_CONTIG_BYTES 1048576
2590
2591 static inline unsigned int ocfs2_cow_contig_clusters(struct super_block *sb)
2592 {
2593 return ocfs2_clusters_for_bytes(sb, MAX_CONTIG_BYTES);
2594 }
2595
2596 static inline unsigned int ocfs2_cow_contig_mask(struct super_block *sb)
2597 {
2598 return ~(ocfs2_cow_contig_clusters(sb) - 1);
2599 }
2600
2601 /*
2602 * Given an extent that starts at 'start' and an I/O that starts at 'cpos',
2603 * find an offset (start + (n * contig_clusters)) that is closest to cpos
2604 * while still being less than or equal to it.
2605 *
2606 * The goal is to break the extent at a multiple of contig_clusters.
2607 */
2608 static inline unsigned int ocfs2_cow_align_start(struct super_block *sb,
2609 unsigned int start,
2610 unsigned int cpos)
2611 {
2612 BUG_ON(start > cpos);
2613
2614 return start + ((cpos - start) & ocfs2_cow_contig_mask(sb));
2615 }
2616
2617 /*
2618 * Given a cluster count of len, pad it out so that it is a multiple
2619 * of contig_clusters.
2620 */
2621 static inline unsigned int ocfs2_cow_align_length(struct super_block *sb,
2622 unsigned int len)
2623 {
2624 unsigned int padded =
2625 (len + (ocfs2_cow_contig_clusters(sb) - 1)) &
2626 ocfs2_cow_contig_mask(sb);
2627
2628 /* Did we wrap? */
2629 if (padded < len)
2630 padded = UINT_MAX;
2631
2632 return padded;
2633 }
2634
2635 /*
2636 * Calculate out the start and number of virtual clusters we need to to CoW.
2637 *
2638 * cpos is vitual start cluster position we want to do CoW in a
2639 * file and write_len is the cluster length.
2640 * max_cpos is the place where we want to stop CoW intentionally.
2641 *
2642 * Normal we will start CoW from the beginning of extent record cotaining cpos.
2643 * We try to break up extents on boundaries of MAX_CONTIG_BYTES so that we
2644 * get good I/O from the resulting extent tree.
2645 */
2646 static int ocfs2_refcount_cal_cow_clusters(struct inode *inode,
2647 struct ocfs2_extent_list *el,
2648 u32 cpos,
2649 u32 write_len,
2650 u32 max_cpos,
2651 u32 *cow_start,
2652 u32 *cow_len)
2653 {
2654 int ret = 0;
2655 int tree_height = le16_to_cpu(el->l_tree_depth), i;
2656 struct buffer_head *eb_bh = NULL;
2657 struct ocfs2_extent_block *eb = NULL;
2658 struct ocfs2_extent_rec *rec;
2659 unsigned int want_clusters, rec_end = 0;
2660 int contig_clusters = ocfs2_cow_contig_clusters(inode->i_sb);
2661 int leaf_clusters;
2662
2663 BUG_ON(cpos + write_len > max_cpos);
2664
2665 if (tree_height > 0) {
2666 ret = ocfs2_find_leaf(INODE_CACHE(inode), el, cpos, &eb_bh);
2667 if (ret) {
2668 mlog_errno(ret);
2669 goto out;
2670 }
2671
2672 eb = (struct ocfs2_extent_block *) eb_bh->b_data;
2673 el = &eb->h_list;
2674
2675 if (el->l_tree_depth) {
2676 ocfs2_error(inode->i_sb,
2677 "Inode %lu has non zero tree depth in "
2678 "leaf block %llu\n", inode->i_ino,
2679 (unsigned long long)eb_bh->b_blocknr);
2680 ret = -EROFS;
2681 goto out;
2682 }
2683 }
2684
2685 *cow_len = 0;
2686 for (i = 0; i < le16_to_cpu(el->l_next_free_rec); i++) {
2687 rec = &el->l_recs[i];
2688
2689 if (ocfs2_is_empty_extent(rec)) {
2690 mlog_bug_on_msg(i != 0, "Inode %lu has empty record in "
2691 "index %d\n", inode->i_ino, i);
2692 continue;
2693 }
2694
2695 if (le32_to_cpu(rec->e_cpos) +
2696 le16_to_cpu(rec->e_leaf_clusters) <= cpos)
2697 continue;
2698
2699 if (*cow_len == 0) {
2700 /*
2701 * We should find a refcounted record in the
2702 * first pass.
2703 */
2704 BUG_ON(!(rec->e_flags & OCFS2_EXT_REFCOUNTED));
2705 *cow_start = le32_to_cpu(rec->e_cpos);
2706 }
2707
2708 /*
2709 * If we encounter a hole, a non-refcounted record or
2710 * pass the max_cpos, stop the search.
2711 */
2712 if ((!(rec->e_flags & OCFS2_EXT_REFCOUNTED)) ||
2713 (*cow_len && rec_end != le32_to_cpu(rec->e_cpos)) ||
2714 (max_cpos <= le32_to_cpu(rec->e_cpos)))
2715 break;
2716
2717 leaf_clusters = le16_to_cpu(rec->e_leaf_clusters);
2718 rec_end = le32_to_cpu(rec->e_cpos) + leaf_clusters;
2719 if (rec_end > max_cpos) {
2720 rec_end = max_cpos;
2721 leaf_clusters = rec_end - le32_to_cpu(rec->e_cpos);
2722 }
2723
2724 /*
2725 * How many clusters do we actually need from
2726 * this extent? First we see how many we actually
2727 * need to complete the write. If that's smaller
2728 * than contig_clusters, we try for contig_clusters.
2729 */
2730 if (!*cow_len)
2731 want_clusters = write_len;
2732 else
2733 want_clusters = (cpos + write_len) -
2734 (*cow_start + *cow_len);
2735 if (want_clusters < contig_clusters)
2736 want_clusters = contig_clusters;
2737
2738 /*
2739 * If the write does not cover the whole extent, we
2740 * need to calculate how we're going to split the extent.
2741 * We try to do it on contig_clusters boundaries.
2742 *
2743 * Any extent smaller than contig_clusters will be
2744 * CoWed in its entirety.
2745 */
2746 if (leaf_clusters <= contig_clusters)
2747 *cow_len += leaf_clusters;
2748 else if (*cow_len || (*cow_start == cpos)) {
2749 /*
2750 * This extent needs to be CoW'd from its
2751 * beginning, so all we have to do is compute
2752 * how many clusters to grab. We align
2753 * want_clusters to the edge of contig_clusters
2754 * to get better I/O.
2755 */
2756 want_clusters = ocfs2_cow_align_length(inode->i_sb,
2757 want_clusters);
2758
2759 if (leaf_clusters < want_clusters)
2760 *cow_len += leaf_clusters;
2761 else
2762 *cow_len += want_clusters;
2763 } else if ((*cow_start + contig_clusters) >=
2764 (cpos + write_len)) {
2765 /*
2766 * Breaking off contig_clusters at the front
2767 * of the extent will cover our write. That's
2768 * easy.
2769 */
2770 *cow_len = contig_clusters;
2771 } else if ((rec_end - cpos) <= contig_clusters) {
2772 /*
2773 * Breaking off contig_clusters at the tail of
2774 * this extent will cover cpos.
2775 */
2776 *cow_start = rec_end - contig_clusters;
2777 *cow_len = contig_clusters;
2778 } else if ((rec_end - cpos) <= want_clusters) {
2779 /*
2780 * While we can't fit the entire write in this
2781 * extent, we know that the write goes from cpos
2782 * to the end of the extent. Break that off.
2783 * We try to break it at some multiple of
2784 * contig_clusters from the front of the extent.
2785 * Failing that (ie, cpos is within
2786 * contig_clusters of the front), we'll CoW the
2787 * entire extent.
2788 */
2789 *cow_start = ocfs2_cow_align_start(inode->i_sb,
2790 *cow_start, cpos);
2791 *cow_len = rec_end - *cow_start;
2792 } else {
2793 /*
2794 * Ok, the entire write lives in the middle of
2795 * this extent. Let's try to slice the extent up
2796 * nicely. Optimally, our CoW region starts at
2797 * m*contig_clusters from the beginning of the
2798 * extent and goes for n*contig_clusters,
2799 * covering the entire write.
2800 */
2801 *cow_start = ocfs2_cow_align_start(inode->i_sb,
2802 *cow_start, cpos);
2803
2804 want_clusters = (cpos + write_len) - *cow_start;
2805 want_clusters = ocfs2_cow_align_length(inode->i_sb,
2806 want_clusters);
2807 if (*cow_start + want_clusters <= rec_end)
2808 *cow_len = want_clusters;
2809 else
2810 *cow_len = rec_end - *cow_start;
2811 }
2812
2813 /* Have we covered our entire write yet? */
2814 if ((*cow_start + *cow_len) >= (cpos + write_len))
2815 break;
2816
2817 /*
2818 * If we reach the end of the extent block and don't get enough
2819 * clusters, continue with the next extent block if possible.
2820 */
2821 if (i + 1 == le16_to_cpu(el->l_next_free_rec) &&
2822 eb && eb->h_next_leaf_blk) {
2823 brelse(eb_bh);
2824 eb_bh = NULL;
2825
2826 ret = ocfs2_read_extent_block(INODE_CACHE(inode),
2827 le64_to_cpu(eb->h_next_leaf_blk),
2828 &eb_bh);
2829 if (ret) {
2830 mlog_errno(ret);
2831 goto out;
2832 }
2833
2834 eb = (struct ocfs2_extent_block *) eb_bh->b_data;
2835 el = &eb->h_list;
2836 i = -1;
2837 }
2838 }
2839
2840 out:
2841 brelse(eb_bh);
2842 return ret;
2843 }
2844
2845 /*
2846 * Prepare meta_ac, data_ac and calculate credits when we want to add some
2847 * num_clusters in data_tree "et" and change the refcount for the old
2848 * clusters(starting form p_cluster) in the refcount tree.
2849 *
2850 * Note:
2851 * 1. since we may split the old tree, so we at most will need num_clusters + 2
2852 * more new leaf records.
2853 * 2. In some case, we may not need to reserve new clusters(e.g, reflink), so
2854 * just give data_ac = NULL.
2855 */
2856 static int ocfs2_lock_refcount_allocators(struct super_block *sb,
2857 u32 p_cluster, u32 num_clusters,
2858 struct ocfs2_extent_tree *et,
2859 struct ocfs2_caching_info *ref_ci,
2860 struct buffer_head *ref_root_bh,
2861 struct ocfs2_alloc_context **meta_ac,
2862 struct ocfs2_alloc_context **data_ac,
2863 int *credits)
2864 {
2865 int ret = 0, meta_add = 0;
2866 int num_free_extents = ocfs2_num_free_extents(OCFS2_SB(sb), et);
2867
2868 if (num_free_extents < 0) {
2869 ret = num_free_extents;
2870 mlog_errno(ret);
2871 goto out;
2872 }
2873
2874 if (num_free_extents < num_clusters + 2)
2875 meta_add =
2876 ocfs2_extend_meta_needed(et->et_root_el);
2877
2878 *credits += ocfs2_calc_extend_credits(sb, et->et_root_el,
2879 num_clusters + 2);
2880
2881 ret = ocfs2_calc_refcount_meta_credits(sb, ref_ci, ref_root_bh,
2882 p_cluster, num_clusters,
2883 &meta_add, credits);
2884 if (ret) {
2885 mlog_errno(ret);
2886 goto out;
2887 }
2888
2889 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, readahead_pages;
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 readahead_pages =
2944 (ocfs2_cow_contig_clusters(sb) <<
2945 OCFS2_SB(sb)->s_clustersize_bits) >> PAGE_CACHE_SHIFT;
2946 offset = ((loff_t)cpos) << OCFS2_SB(sb)->s_clustersize_bits;
2947 end = offset + (new_len << OCFS2_SB(sb)->s_clustersize_bits);
2948 /*
2949 * We only duplicate pages until we reach the page contains i_size - 1.
2950 * So trim 'end' to i_size.
2951 */
2952 if (end > i_size_read(context->inode))
2953 end = i_size_read(context->inode);
2954
2955 while (offset < end) {
2956 page_index = offset >> PAGE_CACHE_SHIFT;
2957 map_end = ((loff_t)page_index + 1) << PAGE_CACHE_SHIFT;
2958 if (map_end > end)
2959 map_end = end;
2960
2961 /* from, to is the offset within the page. */
2962 from = offset & (PAGE_CACHE_SIZE - 1);
2963 to = PAGE_CACHE_SIZE;
2964 if (map_end & (PAGE_CACHE_SIZE - 1))
2965 to = map_end & (PAGE_CACHE_SIZE - 1);
2966
2967 page = find_or_create_page(mapping, page_index, GFP_NOFS);
2968
2969 /*
2970 * In case PAGE_CACHE_SIZE <= CLUSTER_SIZE, This page
2971 * can't be dirtied before we CoW it out.
2972 */
2973 if (PAGE_CACHE_SIZE <= OCFS2_SB(sb)->s_clustersize)
2974 BUG_ON(PageDirty(page));
2975
2976 if (PageReadahead(page) && context->file) {
2977 page_cache_async_readahead(mapping,
2978 &context->file->f_ra,
2979 context->file,
2980 page, page_index,
2981 readahead_pages);
2982 }
2983
2984 if (!PageUptodate(page)) {
2985 ret = block_read_full_page(page, ocfs2_get_block);
2986 if (ret) {
2987 mlog_errno(ret);
2988 goto unlock;
2989 }
2990 lock_page(page);
2991 }
2992
2993 if (page_has_buffers(page)) {
2994 ret = walk_page_buffers(handle, page_buffers(page),
2995 from, to, &partial,
2996 ocfs2_clear_cow_buffer);
2997 if (ret) {
2998 mlog_errno(ret);
2999 goto unlock;
3000 }
3001 }
3002
3003 ocfs2_map_and_dirty_page(context->inode,
3004 handle, from, to,
3005 page, 0, &new_block);
3006 mark_page_accessed(page);
3007 unlock:
3008 unlock_page(page);
3009 page_cache_release(page);
3010 page = NULL;
3011 offset = map_end;
3012 if (ret)
3013 break;
3014 }
3015
3016 return ret;
3017 }
3018
3019 static int ocfs2_duplicate_clusters_by_jbd(handle_t *handle,
3020 struct ocfs2_cow_context *context,
3021 u32 cpos, u32 old_cluster,
3022 u32 new_cluster, u32 new_len)
3023 {
3024 int ret = 0;
3025 struct super_block *sb = context->inode->i_sb;
3026 struct ocfs2_caching_info *ci = context->data_et.et_ci;
3027 int i, blocks = ocfs2_clusters_to_blocks(sb, new_len);
3028 u64 old_block = ocfs2_clusters_to_blocks(sb, old_cluster);
3029 u64 new_block = ocfs2_clusters_to_blocks(sb, new_cluster);
3030 struct ocfs2_super *osb = OCFS2_SB(sb);
3031 struct buffer_head *old_bh = NULL;
3032 struct buffer_head *new_bh = NULL;
3033
3034 mlog(0, "old_cluster %u, new %u, len %u\n", old_cluster,
3035 new_cluster, new_len);
3036
3037 for (i = 0; i < blocks; i++, old_block++, new_block++) {
3038 new_bh = sb_getblk(osb->sb, new_block);
3039 if (new_bh == NULL) {
3040 ret = -EIO;
3041 mlog_errno(ret);
3042 break;
3043 }
3044
3045 ocfs2_set_new_buffer_uptodate(ci, new_bh);
3046
3047 ret = ocfs2_read_block(ci, old_block, &old_bh, NULL);
3048 if (ret) {
3049 mlog_errno(ret);
3050 break;
3051 }
3052
3053 ret = ocfs2_journal_access(handle, ci, new_bh,
3054 OCFS2_JOURNAL_ACCESS_CREATE);
3055 if (ret) {
3056 mlog_errno(ret);
3057 break;
3058 }
3059
3060 memcpy(new_bh->b_data, old_bh->b_data, sb->s_blocksize);
3061 ocfs2_journal_dirty(handle, new_bh);
3062
3063 brelse(new_bh);
3064 brelse(old_bh);
3065 new_bh = NULL;
3066 old_bh = NULL;
3067 }
3068
3069 brelse(new_bh);
3070 brelse(old_bh);
3071 return ret;
3072 }
3073
3074 static int ocfs2_clear_ext_refcount(handle_t *handle,
3075 struct ocfs2_extent_tree *et,
3076 u32 cpos, u32 p_cluster, u32 len,
3077 unsigned int ext_flags,
3078 struct ocfs2_alloc_context *meta_ac,
3079 struct ocfs2_cached_dealloc_ctxt *dealloc)
3080 {
3081 int ret, index;
3082 struct ocfs2_extent_rec replace_rec;
3083 struct ocfs2_path *path = NULL;
3084 struct ocfs2_extent_list *el;
3085 struct super_block *sb = ocfs2_metadata_cache_get_super(et->et_ci);
3086 u64 ino = ocfs2_metadata_cache_owner(et->et_ci);
3087
3088 mlog(0, "inode %llu cpos %u, len %u, p_cluster %u, ext_flags %u\n",
3089 (unsigned long long)ino, cpos, len, p_cluster, ext_flags);
3090
3091 memset(&replace_rec, 0, sizeof(replace_rec));
3092 replace_rec.e_cpos = cpu_to_le32(cpos);
3093 replace_rec.e_leaf_clusters = cpu_to_le16(len);
3094 replace_rec.e_blkno = cpu_to_le64(ocfs2_clusters_to_blocks(sb,
3095 p_cluster));
3096 replace_rec.e_flags = ext_flags;
3097 replace_rec.e_flags &= ~OCFS2_EXT_REFCOUNTED;
3098
3099 path = ocfs2_new_path_from_et(et);
3100 if (!path) {
3101 ret = -ENOMEM;
3102 mlog_errno(ret);
3103 goto out;
3104 }
3105
3106 ret = ocfs2_find_path(et->et_ci, path, cpos);
3107 if (ret) {
3108 mlog_errno(ret);
3109 goto out;
3110 }
3111
3112 el = path_leaf_el(path);
3113
3114 index = ocfs2_search_extent_list(el, cpos);
3115 if (index == -1 || index >= le16_to_cpu(el->l_next_free_rec)) {
3116 ocfs2_error(sb,
3117 "Inode %llu has an extent at cpos %u which can no "
3118 "longer be found.\n",
3119 (unsigned long long)ino, cpos);
3120 ret = -EROFS;
3121 goto out;
3122 }
3123
3124 ret = ocfs2_split_extent(handle, et, path, index,
3125 &replace_rec, meta_ac, dealloc);
3126 if (ret)
3127 mlog_errno(ret);
3128
3129 out:
3130 ocfs2_free_path(path);
3131 return ret;
3132 }
3133
3134 static int ocfs2_replace_clusters(handle_t *handle,
3135 struct ocfs2_cow_context *context,
3136 u32 cpos, u32 old,
3137 u32 new, u32 len,
3138 unsigned int ext_flags)
3139 {
3140 int ret;
3141 struct ocfs2_caching_info *ci = context->data_et.et_ci;
3142 u64 ino = ocfs2_metadata_cache_owner(ci);
3143
3144 mlog(0, "inode %llu, cpos %u, old %u, new %u, len %u, ext_flags %u\n",
3145 (unsigned long long)ino, cpos, old, new, len, ext_flags);
3146
3147 /*If the old clusters is unwritten, no need to duplicate. */
3148 if (!(ext_flags & OCFS2_EXT_UNWRITTEN)) {
3149 ret = context->cow_duplicate_clusters(handle, context, cpos,
3150 old, new, len);
3151 if (ret) {
3152 mlog_errno(ret);
3153 goto out;
3154 }
3155 }
3156
3157 ret = ocfs2_clear_ext_refcount(handle, &context->data_et,
3158 cpos, new, len, ext_flags,
3159 context->meta_ac, &context->dealloc);
3160 if (ret)
3161 mlog_errno(ret);
3162 out:
3163 return ret;
3164 }
3165
3166 static int ocfs2_cow_sync_writeback(struct super_block *sb,
3167 struct ocfs2_cow_context *context,
3168 u32 cpos, u32 num_clusters)
3169 {
3170 int ret = 0;
3171 loff_t offset, end, map_end;
3172 pgoff_t page_index;
3173 struct page *page;
3174
3175 if (ocfs2_should_order_data(context->inode))
3176 return 0;
3177
3178 offset = ((loff_t)cpos) << OCFS2_SB(sb)->s_clustersize_bits;
3179 end = offset + (num_clusters << OCFS2_SB(sb)->s_clustersize_bits);
3180
3181 ret = filemap_fdatawrite_range(context->inode->i_mapping,
3182 offset, end - 1);
3183 if (ret < 0) {
3184 mlog_errno(ret);
3185 return ret;
3186 }
3187
3188 while (offset < end) {
3189 page_index = offset >> PAGE_CACHE_SHIFT;
3190 map_end = ((loff_t)page_index + 1) << PAGE_CACHE_SHIFT;
3191 if (map_end > end)
3192 map_end = end;
3193
3194 page = find_or_create_page(context->inode->i_mapping,
3195 page_index, GFP_NOFS);
3196 BUG_ON(!page);
3197
3198 wait_on_page_writeback(page);
3199 if (PageError(page)) {
3200 ret = -EIO;
3201 mlog_errno(ret);
3202 } else
3203 mark_page_accessed(page);
3204
3205 unlock_page(page);
3206 page_cache_release(page);
3207 page = NULL;
3208 offset = map_end;
3209 if (ret)
3210 break;
3211 }
3212
3213 return ret;
3214 }
3215
3216 static int ocfs2_di_get_clusters(struct ocfs2_cow_context *context,
3217 u32 v_cluster, u32 *p_cluster,
3218 u32 *num_clusters,
3219 unsigned int *extent_flags)
3220 {
3221 return ocfs2_get_clusters(context->inode, v_cluster, p_cluster,
3222 num_clusters, extent_flags);
3223 }
3224
3225 static int ocfs2_make_clusters_writable(struct super_block *sb,
3226 struct ocfs2_cow_context *context,
3227 u32 cpos, u32 p_cluster,
3228 u32 num_clusters, unsigned int e_flags)
3229 {
3230 int ret, delete, index, credits = 0;
3231 u32 new_bit, new_len, orig_num_clusters;
3232 unsigned int set_len;
3233 struct ocfs2_super *osb = OCFS2_SB(sb);
3234 handle_t *handle;
3235 struct buffer_head *ref_leaf_bh = NULL;
3236 struct ocfs2_caching_info *ref_ci = &context->ref_tree->rf_ci;
3237 struct ocfs2_refcount_rec rec;
3238
3239 mlog(0, "cpos %u, p_cluster %u, num_clusters %u, e_flags %u\n",
3240 cpos, p_cluster, num_clusters, e_flags);
3241
3242 ret = ocfs2_lock_refcount_allocators(sb, p_cluster, num_clusters,
3243 &context->data_et,
3244 ref_ci,
3245 context->ref_root_bh,
3246 &context->meta_ac,
3247 &context->data_ac, &credits);
3248 if (ret) {
3249 mlog_errno(ret);
3250 return ret;
3251 }
3252
3253 if (context->post_refcount)
3254 credits += context->post_refcount->credits;
3255
3256 credits += context->extra_credits;
3257 handle = ocfs2_start_trans(osb, credits);
3258 if (IS_ERR(handle)) {
3259 ret = PTR_ERR(handle);
3260 mlog_errno(ret);
3261 goto out;
3262 }
3263
3264 orig_num_clusters = num_clusters;
3265
3266 while (num_clusters) {
3267 ret = ocfs2_get_refcount_rec(ref_ci, context->ref_root_bh,
3268 p_cluster, num_clusters,
3269 &rec, &index, &ref_leaf_bh);
3270 if (ret) {
3271 mlog_errno(ret);
3272 goto out_commit;
3273 }
3274
3275 BUG_ON(!rec.r_refcount);
3276 set_len = min((u64)p_cluster + num_clusters,
3277 le64_to_cpu(rec.r_cpos) +
3278 le32_to_cpu(rec.r_clusters)) - p_cluster;
3279
3280 /*
3281 * There are many different situation here.
3282 * 1. If refcount == 1, remove the flag and don't COW.
3283 * 2. If refcount > 1, allocate clusters.
3284 * Here we may not allocate r_len once at a time, so continue
3285 * until we reach num_clusters.
3286 */
3287 if (le32_to_cpu(rec.r_refcount) == 1) {
3288 delete = 0;
3289 ret = ocfs2_clear_ext_refcount(handle,
3290 &context->data_et,
3291 cpos, p_cluster,
3292 set_len, e_flags,
3293 context->meta_ac,
3294 &context->dealloc);
3295 if (ret) {
3296 mlog_errno(ret);
3297 goto out_commit;
3298 }
3299 } else {
3300 delete = 1;
3301
3302 ret = __ocfs2_claim_clusters(handle,
3303 context->data_ac,
3304 1, set_len,
3305 &new_bit, &new_len);
3306 if (ret) {
3307 mlog_errno(ret);
3308 goto out_commit;
3309 }
3310
3311 ret = ocfs2_replace_clusters(handle, context,
3312 cpos, p_cluster, new_bit,
3313 new_len, e_flags);
3314 if (ret) {
3315 mlog_errno(ret);
3316 goto out_commit;
3317 }
3318 set_len = new_len;
3319 }
3320
3321 ret = __ocfs2_decrease_refcount(handle, ref_ci,
3322 context->ref_root_bh,
3323 p_cluster, set_len,
3324 context->meta_ac,
3325 &context->dealloc, delete);
3326 if (ret) {
3327 mlog_errno(ret);
3328 goto out_commit;
3329 }
3330
3331 cpos += set_len;
3332 p_cluster += set_len;
3333 num_clusters -= set_len;
3334 brelse(ref_leaf_bh);
3335 ref_leaf_bh = NULL;
3336 }
3337
3338 /* handle any post_cow action. */
3339 if (context->post_refcount && context->post_refcount->func) {
3340 ret = context->post_refcount->func(context->inode, handle,
3341 context->post_refcount->para);
3342 if (ret) {
3343 mlog_errno(ret);
3344 goto out_commit;
3345 }
3346 }
3347
3348 /*
3349 * Here we should write the new page out first if we are
3350 * in write-back mode.
3351 */
3352 if (context->get_clusters == ocfs2_di_get_clusters) {
3353 ret = ocfs2_cow_sync_writeback(sb, context, cpos,
3354 orig_num_clusters);
3355 if (ret)
3356 mlog_errno(ret);
3357 }
3358
3359 out_commit:
3360 ocfs2_commit_trans(osb, handle);
3361
3362 out:
3363 if (context->data_ac) {
3364 ocfs2_free_alloc_context(context->data_ac);
3365 context->data_ac = NULL;
3366 }
3367 if (context->meta_ac) {
3368 ocfs2_free_alloc_context(context->meta_ac);
3369 context->meta_ac = NULL;
3370 }
3371 brelse(ref_leaf_bh);
3372
3373 return ret;
3374 }
3375
3376 static int ocfs2_replace_cow(struct ocfs2_cow_context *context)
3377 {
3378 int ret = 0;
3379 struct inode *inode = context->inode;
3380 u32 cow_start = context->cow_start, cow_len = context->cow_len;
3381 u32 p_cluster, num_clusters;
3382 unsigned int ext_flags;
3383 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3384
3385 if (!ocfs2_refcount_tree(OCFS2_SB(inode->i_sb))) {
3386 ocfs2_error(inode->i_sb, "Inode %lu want to use refcount "
3387 "tree, but the feature bit is not set in the "
3388 "super block.", inode->i_ino);
3389 return -EROFS;
3390 }
3391
3392 ocfs2_init_dealloc_ctxt(&context->dealloc);
3393
3394 while (cow_len) {
3395 ret = context->get_clusters(context, cow_start, &p_cluster,
3396 &num_clusters, &ext_flags);
3397 if (ret) {
3398 mlog_errno(ret);
3399 break;
3400 }
3401
3402 BUG_ON(!(ext_flags & OCFS2_EXT_REFCOUNTED));
3403
3404 if (cow_len < num_clusters)
3405 num_clusters = cow_len;
3406
3407 ret = ocfs2_make_clusters_writable(inode->i_sb, context,
3408 cow_start, p_cluster,
3409 num_clusters, ext_flags);
3410 if (ret) {
3411 mlog_errno(ret);
3412 break;
3413 }
3414
3415 cow_len -= num_clusters;
3416 cow_start += num_clusters;
3417 }
3418
3419 if (ocfs2_dealloc_has_cluster(&context->dealloc)) {
3420 ocfs2_schedule_truncate_log_flush(osb, 1);
3421 ocfs2_run_deallocs(osb, &context->dealloc);
3422 }
3423
3424 return ret;
3425 }
3426
3427 static void ocfs2_readahead_for_cow(struct inode *inode,
3428 struct file *file,
3429 u32 start, u32 len)
3430 {
3431 struct address_space *mapping;
3432 pgoff_t index;
3433 unsigned long num_pages;
3434 int cs_bits = OCFS2_SB(inode->i_sb)->s_clustersize_bits;
3435
3436 if (!file)
3437 return;
3438
3439 mapping = file->f_mapping;
3440 num_pages = (len << cs_bits) >> PAGE_CACHE_SHIFT;
3441 if (!num_pages)
3442 num_pages = 1;
3443
3444 index = ((loff_t)start << cs_bits) >> PAGE_CACHE_SHIFT;
3445 page_cache_sync_readahead(mapping, &file->f_ra, file,
3446 index, num_pages);
3447 }
3448
3449 /*
3450 * Starting at cpos, try to CoW write_len clusters. Don't CoW
3451 * past max_cpos. This will stop when it runs into a hole or an
3452 * unrefcounted extent.
3453 */
3454 static int ocfs2_refcount_cow_hunk(struct inode *inode,
3455 struct file *file,
3456 struct buffer_head *di_bh,
3457 u32 cpos, u32 write_len, u32 max_cpos)
3458 {
3459 int ret;
3460 u32 cow_start = 0, cow_len = 0;
3461 struct ocfs2_inode_info *oi = OCFS2_I(inode);
3462 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3463 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
3464 struct buffer_head *ref_root_bh = NULL;
3465 struct ocfs2_refcount_tree *ref_tree;
3466 struct ocfs2_cow_context *context = NULL;
3467
3468 BUG_ON(!(oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL));
3469
3470 ret = ocfs2_refcount_cal_cow_clusters(inode, &di->id2.i_list,
3471 cpos, write_len, max_cpos,
3472 &cow_start, &cow_len);
3473 if (ret) {
3474 mlog_errno(ret);
3475 goto out;
3476 }
3477
3478 mlog(0, "CoW inode %lu, cpos %u, write_len %u, cow_start %u, "
3479 "cow_len %u\n", inode->i_ino,
3480 cpos, write_len, cow_start, cow_len);
3481
3482 BUG_ON(cow_len == 0);
3483
3484 ocfs2_readahead_for_cow(inode, file, cow_start, cow_len);
3485
3486 context = kzalloc(sizeof(struct ocfs2_cow_context), GFP_NOFS);
3487 if (!context) {
3488 ret = -ENOMEM;
3489 mlog_errno(ret);
3490 goto out;
3491 }
3492
3493 ret = ocfs2_lock_refcount_tree(osb, le64_to_cpu(di->i_refcount_loc),
3494 1, &ref_tree, &ref_root_bh);
3495 if (ret) {
3496 mlog_errno(ret);
3497 goto out;
3498 }
3499
3500 context->inode = inode;
3501 context->cow_start = cow_start;
3502 context->cow_len = cow_len;
3503 context->ref_tree = ref_tree;
3504 context->ref_root_bh = ref_root_bh;
3505 context->cow_duplicate_clusters = ocfs2_duplicate_clusters_by_page;
3506 context->get_clusters = ocfs2_di_get_clusters;
3507 context->file = file;
3508
3509 ocfs2_init_dinode_extent_tree(&context->data_et,
3510 INODE_CACHE(inode), di_bh);
3511
3512 ret = ocfs2_replace_cow(context);
3513 if (ret)
3514 mlog_errno(ret);
3515
3516 /*
3517 * truncate the extent map here since no matter whether we meet with
3518 * any error during the action, we shouldn't trust cached extent map
3519 * any more.
3520 */
3521 ocfs2_extent_map_trunc(inode, cow_start);
3522
3523 ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
3524 brelse(ref_root_bh);
3525 out:
3526 kfree(context);
3527 return ret;
3528 }
3529
3530 /*
3531 * CoW any and all clusters between cpos and cpos+write_len.
3532 * Don't CoW past max_cpos. If this returns successfully, all
3533 * clusters between cpos and cpos+write_len are safe to modify.
3534 */
3535 int ocfs2_refcount_cow(struct inode *inode,
3536 struct file *file,
3537 struct buffer_head *di_bh,
3538 u32 cpos, u32 write_len, u32 max_cpos)
3539 {
3540 int ret = 0;
3541 u32 p_cluster, num_clusters;
3542 unsigned int ext_flags;
3543
3544 while (write_len) {
3545 ret = ocfs2_get_clusters(inode, cpos, &p_cluster,
3546 &num_clusters, &ext_flags);
3547 if (ret) {
3548 mlog_errno(ret);
3549 break;
3550 }
3551
3552 if (write_len < num_clusters)
3553 num_clusters = write_len;
3554
3555 if (ext_flags & OCFS2_EXT_REFCOUNTED) {
3556 ret = ocfs2_refcount_cow_hunk(inode, file, di_bh, cpos,
3557 num_clusters, max_cpos);
3558 if (ret) {
3559 mlog_errno(ret);
3560 break;
3561 }
3562 }
3563
3564 write_len -= num_clusters;
3565 cpos += num_clusters;
3566 }
3567
3568 return ret;
3569 }
3570
3571 static int ocfs2_xattr_value_get_clusters(struct ocfs2_cow_context *context,
3572 u32 v_cluster, u32 *p_cluster,
3573 u32 *num_clusters,
3574 unsigned int *extent_flags)
3575 {
3576 struct inode *inode = context->inode;
3577 struct ocfs2_xattr_value_root *xv = context->cow_object;
3578
3579 return ocfs2_xattr_get_clusters(inode, v_cluster, p_cluster,
3580 num_clusters, &xv->xr_list,
3581 extent_flags);
3582 }
3583
3584 /*
3585 * Given a xattr value root, calculate the most meta/credits we need for
3586 * refcount tree change if we truncate it to 0.
3587 */
3588 int ocfs2_refcounted_xattr_delete_need(struct inode *inode,
3589 struct ocfs2_caching_info *ref_ci,
3590 struct buffer_head *ref_root_bh,
3591 struct ocfs2_xattr_value_root *xv,
3592 int *meta_add, int *credits)
3593 {
3594 int ret = 0, index, ref_blocks = 0;
3595 u32 p_cluster, num_clusters;
3596 u32 cpos = 0, clusters = le32_to_cpu(xv->xr_clusters);
3597 struct ocfs2_refcount_block *rb;
3598 struct ocfs2_refcount_rec rec;
3599 struct buffer_head *ref_leaf_bh = NULL;
3600
3601 while (cpos < clusters) {
3602 ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster,
3603 &num_clusters, &xv->xr_list,
3604 NULL);
3605 if (ret) {
3606 mlog_errno(ret);
3607 goto out;
3608 }
3609
3610 cpos += num_clusters;
3611
3612 while (num_clusters) {
3613 ret = ocfs2_get_refcount_rec(ref_ci, ref_root_bh,
3614 p_cluster, num_clusters,
3615 &rec, &index,
3616 &ref_leaf_bh);
3617 if (ret) {
3618 mlog_errno(ret);
3619 goto out;
3620 }
3621
3622 BUG_ON(!rec.r_refcount);
3623
3624 rb = (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
3625
3626 /*
3627 * We really don't know whether the other clusters is in
3628 * this refcount block or not, so just take the worst
3629 * case that all the clusters are in this block and each
3630 * one will split a refcount rec, so totally we need
3631 * clusters * 2 new refcount rec.
3632 */
3633 if (le64_to_cpu(rb->rf_records.rl_used) + clusters * 2 >
3634 le16_to_cpu(rb->rf_records.rl_count))
3635 ref_blocks++;
3636
3637 *credits += 1;
3638 brelse(ref_leaf_bh);
3639 ref_leaf_bh = NULL;
3640
3641 if (num_clusters <= le32_to_cpu(rec.r_clusters))
3642 break;
3643 else
3644 num_clusters -= le32_to_cpu(rec.r_clusters);
3645 p_cluster += num_clusters;
3646 }
3647 }
3648
3649 *meta_add += ref_blocks;
3650 if (!ref_blocks)
3651 goto out;
3652
3653 rb = (struct ocfs2_refcount_block *)ref_root_bh->b_data;
3654 if (le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL)
3655 *credits += OCFS2_EXPAND_REFCOUNT_TREE_CREDITS;
3656 else {
3657 struct ocfs2_extent_tree et;
3658
3659 ocfs2_init_refcount_extent_tree(&et, ref_ci, ref_root_bh);
3660 *credits += ocfs2_calc_extend_credits(inode->i_sb,
3661 et.et_root_el,
3662 ref_blocks);
3663 }
3664
3665 out:
3666 brelse(ref_leaf_bh);
3667 return ret;
3668 }
3669
3670 /*
3671 * Do CoW for xattr.
3672 */
3673 int ocfs2_refcount_cow_xattr(struct inode *inode,
3674 struct ocfs2_dinode *di,
3675 struct ocfs2_xattr_value_buf *vb,
3676 struct ocfs2_refcount_tree *ref_tree,
3677 struct buffer_head *ref_root_bh,
3678 u32 cpos, u32 write_len,
3679 struct ocfs2_post_refcount *post)
3680 {
3681 int ret;
3682 struct ocfs2_xattr_value_root *xv = vb->vb_xv;
3683 struct ocfs2_inode_info *oi = OCFS2_I(inode);
3684 struct ocfs2_cow_context *context = NULL;
3685 u32 cow_start, cow_len;
3686
3687 BUG_ON(!(oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL));
3688
3689 ret = ocfs2_refcount_cal_cow_clusters(inode, &xv->xr_list,
3690 cpos, write_len, UINT_MAX,
3691 &cow_start, &cow_len);
3692 if (ret) {
3693 mlog_errno(ret);
3694 goto out;
3695 }
3696
3697 BUG_ON(cow_len == 0);
3698
3699 context = kzalloc(sizeof(struct ocfs2_cow_context), GFP_NOFS);
3700 if (!context) {
3701 ret = -ENOMEM;
3702 mlog_errno(ret);
3703 goto out;
3704 }
3705
3706 context->inode = inode;
3707 context->cow_start = cow_start;
3708 context->cow_len = cow_len;
3709 context->ref_tree = ref_tree;
3710 context->ref_root_bh = ref_root_bh;;
3711 context->cow_object = xv;
3712
3713 context->cow_duplicate_clusters = ocfs2_duplicate_clusters_by_jbd;
3714 /* We need the extra credits for duplicate_clusters by jbd. */
3715 context->extra_credits =
3716 ocfs2_clusters_to_blocks(inode->i_sb, 1) * cow_len;
3717 context->get_clusters = ocfs2_xattr_value_get_clusters;
3718 context->post_refcount = post;
3719
3720 ocfs2_init_xattr_value_extent_tree(&context->data_et,
3721 INODE_CACHE(inode), vb);
3722
3723 ret = ocfs2_replace_cow(context);
3724 if (ret)
3725 mlog_errno(ret);
3726
3727 out:
3728 kfree(context);
3729 return ret;
3730 }
3731
3732 /*
3733 * Insert a new extent into refcount tree and mark a extent rec
3734 * as refcounted in the dinode tree.
3735 */
3736 int ocfs2_add_refcount_flag(struct inode *inode,
3737 struct ocfs2_extent_tree *data_et,
3738 struct ocfs2_caching_info *ref_ci,
3739 struct buffer_head *ref_root_bh,
3740 u32 cpos, u32 p_cluster, u32 num_clusters,
3741 struct ocfs2_cached_dealloc_ctxt *dealloc,
3742 struct ocfs2_post_refcount *post)
3743 {
3744 int ret;
3745 handle_t *handle;
3746 int credits = 1, ref_blocks = 0;
3747 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3748 struct ocfs2_alloc_context *meta_ac = NULL;
3749
3750 ret = ocfs2_calc_refcount_meta_credits(inode->i_sb,
3751 ref_ci, ref_root_bh,
3752 p_cluster, num_clusters,
3753 &ref_blocks, &credits);
3754 if (ret) {
3755 mlog_errno(ret);
3756 goto out;
3757 }
3758
3759 mlog(0, "reserve new metadata %d, credits = %d\n",
3760 ref_blocks, credits);
3761
3762 if (ref_blocks) {
3763 ret = ocfs2_reserve_new_metadata_blocks(OCFS2_SB(inode->i_sb),
3764 ref_blocks, &meta_ac);
3765 if (ret) {
3766 mlog_errno(ret);
3767 goto out;
3768 }
3769 }
3770
3771 if (post)
3772 credits += post->credits;
3773
3774 handle = ocfs2_start_trans(osb, credits);
3775 if (IS_ERR(handle)) {
3776 ret = PTR_ERR(handle);
3777 mlog_errno(ret);
3778 goto out;
3779 }
3780
3781 ret = ocfs2_mark_extent_refcounted(inode, data_et, handle,
3782 cpos, num_clusters, p_cluster,
3783 meta_ac, dealloc);
3784 if (ret) {
3785 mlog_errno(ret);
3786 goto out_commit;
3787 }
3788
3789 ret = __ocfs2_increase_refcount(handle, ref_ci, ref_root_bh,
3790 p_cluster, num_clusters, 0,
3791 meta_ac, dealloc);
3792 if (ret) {
3793 mlog_errno(ret);
3794 goto out_commit;
3795 }
3796
3797 if (post && post->func) {
3798 ret = post->func(inode, handle, post->para);
3799 if (ret)
3800 mlog_errno(ret);
3801 }
3802
3803 out_commit:
3804 ocfs2_commit_trans(osb, handle);
3805 out:
3806 if (meta_ac)
3807 ocfs2_free_alloc_context(meta_ac);
3808 return ret;
3809 }
3810
3811 static int ocfs2_change_ctime(struct inode *inode,
3812 struct buffer_head *di_bh)
3813 {
3814 int ret;
3815 handle_t *handle;
3816 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
3817
3818 handle = ocfs2_start_trans(OCFS2_SB(inode->i_sb),
3819 OCFS2_INODE_UPDATE_CREDITS);
3820 if (IS_ERR(handle)) {
3821 ret = PTR_ERR(handle);
3822 mlog_errno(ret);
3823 goto out;
3824 }
3825
3826 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
3827 OCFS2_JOURNAL_ACCESS_WRITE);
3828 if (ret) {
3829 mlog_errno(ret);
3830 goto out_commit;
3831 }
3832
3833 inode->i_ctime = CURRENT_TIME;
3834 di->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
3835 di->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
3836
3837 ocfs2_journal_dirty(handle, di_bh);
3838
3839 out_commit:
3840 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
3841 out:
3842 return ret;
3843 }
3844
3845 static int ocfs2_attach_refcount_tree(struct inode *inode,
3846 struct buffer_head *di_bh)
3847 {
3848 int ret, data_changed = 0;
3849 struct buffer_head *ref_root_bh = NULL;
3850 struct ocfs2_inode_info *oi = OCFS2_I(inode);
3851 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
3852 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3853 struct ocfs2_refcount_tree *ref_tree;
3854 unsigned int ext_flags;
3855 loff_t size;
3856 u32 cpos, num_clusters, clusters, p_cluster;
3857 struct ocfs2_cached_dealloc_ctxt dealloc;
3858 struct ocfs2_extent_tree di_et;
3859
3860 ocfs2_init_dealloc_ctxt(&dealloc);
3861
3862 if (!(oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL)) {
3863 ret = ocfs2_create_refcount_tree(inode, di_bh);
3864 if (ret) {
3865 mlog_errno(ret);
3866 goto out;
3867 }
3868 }
3869
3870 BUG_ON(!di->i_refcount_loc);
3871 ret = ocfs2_lock_refcount_tree(osb,
3872 le64_to_cpu(di->i_refcount_loc), 1,
3873 &ref_tree, &ref_root_bh);
3874 if (ret) {
3875 mlog_errno(ret);
3876 goto out;
3877 }
3878
3879 if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL)
3880 goto attach_xattr;
3881
3882 ocfs2_init_dinode_extent_tree(&di_et, INODE_CACHE(inode), di_bh);
3883
3884 size = i_size_read(inode);
3885 clusters = ocfs2_clusters_for_bytes(inode->i_sb, size);
3886
3887 cpos = 0;
3888 while (cpos < clusters) {
3889 ret = ocfs2_get_clusters(inode, cpos, &p_cluster,
3890 &num_clusters, &ext_flags);
3891
3892 if (p_cluster && !(ext_flags & OCFS2_EXT_REFCOUNTED)) {
3893 ret = ocfs2_add_refcount_flag(inode, &di_et,
3894 &ref_tree->rf_ci,
3895 ref_root_bh, cpos,
3896 p_cluster, num_clusters,
3897 &dealloc, NULL);
3898 if (ret) {
3899 mlog_errno(ret);
3900 goto unlock;
3901 }
3902
3903 data_changed = 1;
3904 }
3905 cpos += num_clusters;
3906 }
3907
3908 attach_xattr:
3909 if (oi->ip_dyn_features & OCFS2_HAS_XATTR_FL) {
3910 ret = ocfs2_xattr_attach_refcount_tree(inode, di_bh,
3911 &ref_tree->rf_ci,
3912 ref_root_bh,
3913 &dealloc);
3914 if (ret) {
3915 mlog_errno(ret);
3916 goto unlock;
3917 }
3918 }
3919
3920 if (data_changed) {
3921 ret = ocfs2_change_ctime(inode, di_bh);
3922 if (ret)
3923 mlog_errno(ret);
3924 }
3925
3926 unlock:
3927 ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
3928 brelse(ref_root_bh);
3929
3930 if (!ret && ocfs2_dealloc_has_cluster(&dealloc)) {
3931 ocfs2_schedule_truncate_log_flush(osb, 1);
3932 ocfs2_run_deallocs(osb, &dealloc);
3933 }
3934 out:
3935 /*
3936 * Empty the extent map so that we may get the right extent
3937 * record from the disk.
3938 */
3939 ocfs2_extent_map_trunc(inode, 0);
3940
3941 return ret;
3942 }
3943
3944 static int ocfs2_add_refcounted_extent(struct inode *inode,
3945 struct ocfs2_extent_tree *et,
3946 struct ocfs2_caching_info *ref_ci,
3947 struct buffer_head *ref_root_bh,
3948 u32 cpos, u32 p_cluster, u32 num_clusters,
3949 unsigned int ext_flags,
3950 struct ocfs2_cached_dealloc_ctxt *dealloc)
3951 {
3952 int ret;
3953 handle_t *handle;
3954 int credits = 0;
3955 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3956 struct ocfs2_alloc_context *meta_ac = NULL;
3957
3958 ret = ocfs2_lock_refcount_allocators(inode->i_sb,
3959 p_cluster, num_clusters,
3960 et, ref_ci,
3961 ref_root_bh, &meta_ac,
3962 NULL, &credits);
3963 if (ret) {
3964 mlog_errno(ret);
3965 goto out;
3966 }
3967
3968 handle = ocfs2_start_trans(osb, credits);
3969 if (IS_ERR(handle)) {
3970 ret = PTR_ERR(handle);
3971 mlog_errno(ret);
3972 goto out;
3973 }
3974
3975 ret = ocfs2_insert_extent(handle, et, cpos,
3976 ocfs2_clusters_to_blocks(inode->i_sb, p_cluster),
3977 num_clusters, ext_flags, meta_ac);
3978 if (ret) {
3979 mlog_errno(ret);
3980 goto out_commit;
3981 }
3982
3983 ret = ocfs2_increase_refcount(handle, ref_ci, ref_root_bh,
3984 p_cluster, num_clusters,
3985 meta_ac, dealloc);
3986 if (ret)
3987 mlog_errno(ret);
3988
3989 out_commit:
3990 ocfs2_commit_trans(osb, handle);
3991 out:
3992 if (meta_ac)
3993 ocfs2_free_alloc_context(meta_ac);
3994 return ret;
3995 }
3996
3997 static int ocfs2_duplicate_inline_data(struct inode *s_inode,
3998 struct buffer_head *s_bh,
3999 struct inode *t_inode,
4000 struct buffer_head *t_bh)
4001 {
4002 int ret;
4003 handle_t *handle;
4004 struct ocfs2_super *osb = OCFS2_SB(s_inode->i_sb);
4005 struct ocfs2_dinode *s_di = (struct ocfs2_dinode *)s_bh->b_data;
4006 struct ocfs2_dinode *t_di = (struct ocfs2_dinode *)t_bh->b_data;
4007
4008 BUG_ON(!(OCFS2_I(s_inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL));
4009
4010 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
4011 if (IS_ERR(handle)) {
4012 ret = PTR_ERR(handle);
4013 mlog_errno(ret);
4014 goto out;
4015 }
4016
4017 ret = ocfs2_journal_access_di(handle, INODE_CACHE(t_inode), t_bh,
4018 OCFS2_JOURNAL_ACCESS_WRITE);
4019 if (ret) {
4020 mlog_errno(ret);
4021 goto out_commit;
4022 }
4023
4024 t_di->id2.i_data.id_count = s_di->id2.i_data.id_count;
4025 memcpy(t_di->id2.i_data.id_data, s_di->id2.i_data.id_data,
4026 le16_to_cpu(s_di->id2.i_data.id_count));
4027 spin_lock(&OCFS2_I(t_inode)->ip_lock);
4028 OCFS2_I(t_inode)->ip_dyn_features |= OCFS2_INLINE_DATA_FL;
4029 t_di->i_dyn_features = cpu_to_le16(OCFS2_I(t_inode)->ip_dyn_features);
4030 spin_unlock(&OCFS2_I(t_inode)->ip_lock);
4031
4032 ocfs2_journal_dirty(handle, t_bh);
4033
4034 out_commit:
4035 ocfs2_commit_trans(osb, handle);
4036 out:
4037 return ret;
4038 }
4039
4040 static int ocfs2_duplicate_extent_list(struct inode *s_inode,
4041 struct inode *t_inode,
4042 struct buffer_head *t_bh,
4043 struct ocfs2_caching_info *ref_ci,
4044 struct buffer_head *ref_root_bh,
4045 struct ocfs2_cached_dealloc_ctxt *dealloc)
4046 {
4047 int ret = 0;
4048 u32 p_cluster, num_clusters, clusters, cpos;
4049 loff_t size;
4050 unsigned int ext_flags;
4051 struct ocfs2_extent_tree et;
4052
4053 ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(t_inode), t_bh);
4054
4055 size = i_size_read(s_inode);
4056 clusters = ocfs2_clusters_for_bytes(s_inode->i_sb, size);
4057
4058 cpos = 0;
4059 while (cpos < clusters) {
4060 ret = ocfs2_get_clusters(s_inode, cpos, &p_cluster,
4061 &num_clusters, &ext_flags);
4062
4063 if (p_cluster) {
4064 ret = ocfs2_add_refcounted_extent(t_inode, &et,
4065 ref_ci, ref_root_bh,
4066 cpos, p_cluster,
4067 num_clusters,
4068 ext_flags,
4069 dealloc);
4070 if (ret) {
4071 mlog_errno(ret);
4072 goto out;
4073 }
4074 }
4075
4076 cpos += num_clusters;
4077 }
4078
4079 out:
4080 return ret;
4081 }
4082
4083 /*
4084 * change the new file's attributes to the src.
4085 *
4086 * reflink creates a snapshot of a file, that means the attributes
4087 * must be identical except for three exceptions - nlink, ino, and ctime.
4088 */
4089 static int ocfs2_complete_reflink(struct inode *s_inode,
4090 struct buffer_head *s_bh,
4091 struct inode *t_inode,
4092 struct buffer_head *t_bh,
4093 bool preserve)
4094 {
4095 int ret;
4096 handle_t *handle;
4097 struct ocfs2_dinode *s_di = (struct ocfs2_dinode *)s_bh->b_data;
4098 struct ocfs2_dinode *di = (struct ocfs2_dinode *)t_bh->b_data;
4099 loff_t size = i_size_read(s_inode);
4100
4101 handle = ocfs2_start_trans(OCFS2_SB(t_inode->i_sb),
4102 OCFS2_INODE_UPDATE_CREDITS);
4103 if (IS_ERR(handle)) {
4104 ret = PTR_ERR(handle);
4105 mlog_errno(ret);
4106 return ret;
4107 }
4108
4109 ret = ocfs2_journal_access_di(handle, INODE_CACHE(t_inode), t_bh,
4110 OCFS2_JOURNAL_ACCESS_WRITE);
4111 if (ret) {
4112 mlog_errno(ret);
4113 goto out_commit;
4114 }
4115
4116 spin_lock(&OCFS2_I(t_inode)->ip_lock);
4117 OCFS2_I(t_inode)->ip_clusters = OCFS2_I(s_inode)->ip_clusters;
4118 OCFS2_I(t_inode)->ip_attr = OCFS2_I(s_inode)->ip_attr;
4119 OCFS2_I(t_inode)->ip_dyn_features = OCFS2_I(s_inode)->ip_dyn_features;
4120 spin_unlock(&OCFS2_I(t_inode)->ip_lock);
4121 i_size_write(t_inode, size);
4122 t_inode->i_blocks = s_inode->i_blocks;
4123
4124 di->i_xattr_inline_size = s_di->i_xattr_inline_size;
4125 di->i_clusters = s_di->i_clusters;
4126 di->i_size = s_di->i_size;
4127 di->i_dyn_features = s_di->i_dyn_features;
4128 di->i_attr = s_di->i_attr;
4129
4130 if (preserve) {
4131 t_inode->i_uid = s_inode->i_uid;
4132 t_inode->i_gid = s_inode->i_gid;
4133 t_inode->i_mode = s_inode->i_mode;
4134 di->i_uid = s_di->i_uid;
4135 di->i_gid = s_di->i_gid;
4136 di->i_mode = s_di->i_mode;
4137
4138 /*
4139 * update time.
4140 * we want mtime to appear identical to the source and
4141 * update ctime.
4142 */
4143 t_inode->i_ctime = CURRENT_TIME;
4144
4145 di->i_ctime = cpu_to_le64(t_inode->i_ctime.tv_sec);
4146 di->i_ctime_nsec = cpu_to_le32(t_inode->i_ctime.tv_nsec);
4147
4148 t_inode->i_mtime = s_inode->i_mtime;
4149 di->i_mtime = s_di->i_mtime;
4150 di->i_mtime_nsec = s_di->i_mtime_nsec;
4151 }
4152
4153 ocfs2_journal_dirty(handle, t_bh);
4154
4155 out_commit:
4156 ocfs2_commit_trans(OCFS2_SB(t_inode->i_sb), handle);
4157 return ret;
4158 }
4159
4160 static int ocfs2_create_reflink_node(struct inode *s_inode,
4161 struct buffer_head *s_bh,
4162 struct inode *t_inode,
4163 struct buffer_head *t_bh,
4164 bool preserve)
4165 {
4166 int ret;
4167 struct buffer_head *ref_root_bh = NULL;
4168 struct ocfs2_cached_dealloc_ctxt dealloc;
4169 struct ocfs2_super *osb = OCFS2_SB(s_inode->i_sb);
4170 struct ocfs2_refcount_block *rb;
4171 struct ocfs2_dinode *di = (struct ocfs2_dinode *)s_bh->b_data;
4172 struct ocfs2_refcount_tree *ref_tree;
4173
4174 ocfs2_init_dealloc_ctxt(&dealloc);
4175
4176 ret = ocfs2_set_refcount_tree(t_inode, t_bh,
4177 le64_to_cpu(di->i_refcount_loc));
4178 if (ret) {
4179 mlog_errno(ret);
4180 goto out;
4181 }
4182
4183 if (OCFS2_I(s_inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
4184 ret = ocfs2_duplicate_inline_data(s_inode, s_bh,
4185 t_inode, t_bh);
4186 if (ret)
4187 mlog_errno(ret);
4188 goto out;
4189 }
4190
4191 ret = ocfs2_lock_refcount_tree(osb, le64_to_cpu(di->i_refcount_loc),
4192 1, &ref_tree, &ref_root_bh);
4193 if (ret) {
4194 mlog_errno(ret);
4195 goto out;
4196 }
4197 rb = (struct ocfs2_refcount_block *)ref_root_bh->b_data;
4198
4199 ret = ocfs2_duplicate_extent_list(s_inode, t_inode, t_bh,
4200 &ref_tree->rf_ci, ref_root_bh,
4201 &dealloc);
4202 if (ret) {
4203 mlog_errno(ret);
4204 goto out_unlock_refcount;
4205 }
4206
4207 out_unlock_refcount:
4208 ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
4209 brelse(ref_root_bh);
4210 out:
4211 if (ocfs2_dealloc_has_cluster(&dealloc)) {
4212 ocfs2_schedule_truncate_log_flush(osb, 1);
4213 ocfs2_run_deallocs(osb, &dealloc);
4214 }
4215
4216 return ret;
4217 }
4218
4219 static int __ocfs2_reflink(struct dentry *old_dentry,
4220 struct buffer_head *old_bh,
4221 struct inode *new_inode,
4222 bool preserve)
4223 {
4224 int ret;
4225 struct inode *inode = old_dentry->d_inode;
4226 struct buffer_head *new_bh = NULL;
4227
4228 if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_SYSTEM_FILE) {
4229 ret = -EINVAL;
4230 mlog_errno(ret);
4231 goto out;
4232 }
4233
4234 ret = filemap_fdatawrite(inode->i_mapping);
4235 if (ret) {
4236 mlog_errno(ret);
4237 goto out;
4238 }
4239
4240 ret = ocfs2_attach_refcount_tree(inode, old_bh);
4241 if (ret) {
4242 mlog_errno(ret);
4243 goto out;
4244 }
4245
4246 mutex_lock_nested(&new_inode->i_mutex, I_MUTEX_CHILD);
4247 ret = ocfs2_inode_lock_nested(new_inode, &new_bh, 1,
4248 OI_LS_REFLINK_TARGET);
4249 if (ret) {
4250 mlog_errno(ret);
4251 goto out_unlock;
4252 }
4253
4254 ret = ocfs2_create_reflink_node(inode, old_bh,
4255 new_inode, new_bh, preserve);
4256 if (ret) {
4257 mlog_errno(ret);
4258 goto inode_unlock;
4259 }
4260
4261 if (OCFS2_I(inode)->ip_dyn_features & OCFS2_HAS_XATTR_FL) {
4262 ret = ocfs2_reflink_xattrs(inode, old_bh,
4263 new_inode, new_bh,
4264 preserve);
4265 if (ret) {
4266 mlog_errno(ret);
4267 goto inode_unlock;
4268 }
4269 }
4270
4271 ret = ocfs2_complete_reflink(inode, old_bh,
4272 new_inode, new_bh, preserve);
4273 if (ret)
4274 mlog_errno(ret);
4275
4276 inode_unlock:
4277 ocfs2_inode_unlock(new_inode, 1);
4278 brelse(new_bh);
4279 out_unlock:
4280 mutex_unlock(&new_inode->i_mutex);
4281 out:
4282 if (!ret) {
4283 ret = filemap_fdatawait(inode->i_mapping);
4284 if (ret)
4285 mlog_errno(ret);
4286 }
4287 return ret;
4288 }
4289
4290 static int ocfs2_reflink(struct dentry *old_dentry, struct inode *dir,
4291 struct dentry *new_dentry, bool preserve)
4292 {
4293 int error;
4294 struct inode *inode = old_dentry->d_inode;
4295 struct buffer_head *old_bh = NULL;
4296 struct inode *new_orphan_inode = NULL;
4297
4298 if (!ocfs2_refcount_tree(OCFS2_SB(inode->i_sb)))
4299 return -EOPNOTSUPP;
4300
4301 error = ocfs2_create_inode_in_orphan(dir, inode->i_mode,
4302 &new_orphan_inode);
4303 if (error) {
4304 mlog_errno(error);
4305 goto out;
4306 }
4307
4308 error = ocfs2_inode_lock(inode, &old_bh, 1);
4309 if (error) {
4310 mlog_errno(error);
4311 goto out;
4312 }
4313
4314 down_write(&OCFS2_I(inode)->ip_xattr_sem);
4315 down_write(&OCFS2_I(inode)->ip_alloc_sem);
4316 error = __ocfs2_reflink(old_dentry, old_bh,
4317 new_orphan_inode, preserve);
4318 up_write(&OCFS2_I(inode)->ip_alloc_sem);
4319 up_write(&OCFS2_I(inode)->ip_xattr_sem);
4320
4321 ocfs2_inode_unlock(inode, 1);
4322 brelse(old_bh);
4323
4324 if (error) {
4325 mlog_errno(error);
4326 goto out;
4327 }
4328
4329 /* If the security isn't preserved, we need to re-initialize them. */
4330 if (!preserve) {
4331 error = ocfs2_init_security_and_acl(dir, new_orphan_inode,
4332 &new_dentry->d_name);
4333 if (error)
4334 mlog_errno(error);
4335 }
4336 out:
4337 if (!error) {
4338 error = ocfs2_mv_orphaned_inode_to_new(dir, new_orphan_inode,
4339 new_dentry);
4340 if (error)
4341 mlog_errno(error);
4342 }
4343
4344 if (new_orphan_inode) {
4345 /*
4346 * We need to open_unlock the inode no matter whether we
4347 * succeed or not, so that other nodes can delete it later.
4348 */
4349 ocfs2_open_unlock(new_orphan_inode);
4350 if (error)
4351 iput(new_orphan_inode);
4352 }
4353
4354 return error;
4355 }
4356
4357 /*
4358 * Below here are the bits used by OCFS2_IOC_REFLINK() to fake
4359 * sys_reflink(). This will go away when vfs_reflink() exists in
4360 * fs/namei.c.
4361 */
4362
4363 /* copied from may_create in VFS. */
4364 static inline int ocfs2_may_create(struct inode *dir, struct dentry *child)
4365 {
4366 if (child->d_inode)
4367 return -EEXIST;
4368 if (IS_DEADDIR(dir))
4369 return -ENOENT;
4370 return inode_permission(dir, MAY_WRITE | MAY_EXEC);
4371 }
4372
4373 /* copied from user_path_parent. */
4374 static int ocfs2_user_path_parent(const char __user *path,
4375 struct nameidata *nd, char **name)
4376 {
4377 char *s = getname(path);
4378 int error;
4379
4380 if (IS_ERR(s))
4381 return PTR_ERR(s);
4382
4383 error = kern_path_parent(s, nd);
4384 if (error)
4385 putname(s);
4386 else
4387 *name = s;
4388
4389 return error;
4390 }
4391
4392 /**
4393 * ocfs2_vfs_reflink - Create a reference-counted link
4394 *
4395 * @old_dentry: source dentry + inode
4396 * @dir: directory to create the target
4397 * @new_dentry: target dentry
4398 * @preserve: if true, preserve all file attributes
4399 */
4400 static int ocfs2_vfs_reflink(struct dentry *old_dentry, struct inode *dir,
4401 struct dentry *new_dentry, bool preserve)
4402 {
4403 struct inode *inode = old_dentry->d_inode;
4404 int error;
4405
4406 if (!inode)
4407 return -ENOENT;
4408
4409 error = ocfs2_may_create(dir, new_dentry);
4410 if (error)
4411 return error;
4412
4413 if (dir->i_sb != inode->i_sb)
4414 return -EXDEV;
4415
4416 /*
4417 * A reflink to an append-only or immutable file cannot be created.
4418 */
4419 if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
4420 return -EPERM;
4421
4422 /* Only regular files can be reflinked. */
4423 if (!S_ISREG(inode->i_mode))
4424 return -EPERM;
4425
4426 /*
4427 * If the caller wants to preserve ownership, they require the
4428 * rights to do so.
4429 */
4430 if (preserve) {
4431 if ((current_fsuid() != inode->i_uid) && !capable(CAP_CHOWN))
4432 return -EPERM;
4433 if (!in_group_p(inode->i_gid) && !capable(CAP_CHOWN))
4434 return -EPERM;
4435 }
4436
4437 /*
4438 * If the caller is modifying any aspect of the attributes, they
4439 * are not creating a snapshot. They need read permission on the
4440 * file.
4441 */
4442 if (!preserve) {
4443 error = inode_permission(inode, MAY_READ);
4444 if (error)
4445 return error;
4446 }
4447
4448 mutex_lock(&inode->i_mutex);
4449 dquot_initialize(dir);
4450 error = ocfs2_reflink(old_dentry, dir, new_dentry, preserve);
4451 mutex_unlock(&inode->i_mutex);
4452 if (!error)
4453 fsnotify_create(dir, new_dentry);
4454 return error;
4455 }
4456 /*
4457 * Most codes are copied from sys_linkat.
4458 */
4459 int ocfs2_reflink_ioctl(struct inode *inode,
4460 const char __user *oldname,
4461 const char __user *newname,
4462 bool preserve)
4463 {
4464 struct dentry *new_dentry;
4465 struct nameidata nd;
4466 struct path old_path;
4467 int error;
4468 char *to = NULL;
4469
4470 if (!ocfs2_refcount_tree(OCFS2_SB(inode->i_sb)))
4471 return -EOPNOTSUPP;
4472
4473 error = user_path_at(AT_FDCWD, oldname, 0, &old_path);
4474 if (error) {
4475 mlog_errno(error);
4476 return error;
4477 }
4478
4479 error = ocfs2_user_path_parent(newname, &nd, &to);
4480 if (error) {
4481 mlog_errno(error);
4482 goto out;
4483 }
4484
4485 error = -EXDEV;
4486 if (old_path.mnt != nd.path.mnt)
4487 goto out_release;
4488 new_dentry = lookup_create(&nd, 0);
4489 error = PTR_ERR(new_dentry);
4490 if (IS_ERR(new_dentry)) {
4491 mlog_errno(error);
4492 goto out_unlock;
4493 }
4494
4495 error = mnt_want_write(nd.path.mnt);
4496 if (error) {
4497 mlog_errno(error);
4498 goto out_dput;
4499 }
4500
4501 error = ocfs2_vfs_reflink(old_path.dentry,
4502 nd.path.dentry->d_inode,
4503 new_dentry, preserve);
4504 mnt_drop_write(nd.path.mnt);
4505 out_dput:
4506 dput(new_dentry);
4507 out_unlock:
4508 mutex_unlock(&nd.path.dentry->d_inode->i_mutex);
4509 out_release:
4510 path_put(&nd.path);
4511 putname(to);
4512 out:
4513 path_put(&old_path);
4514
4515 return error;
4516 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree