blob: b69dd14c0b9ba1e39aa7662aec0350e8b5044702 [file] [log] [blame]
Tao Maf2c870e2009-08-18 11:19:26 +08001/* -*- 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
Tao Mae73a8192009-08-11 14:33:14 +080018#include <linux/sort.h>
Tao Maf2c870e2009-08-18 11:19:26 +080019#include <cluster/masklog.h>
20#include "ocfs2.h"
21#include "inode.h"
22#include "alloc.h"
23#include "suballoc.h"
24#include "journal.h"
25#include "uptodate.h"
26#include "super.h"
27#include "buffer_head_io.h"
28#include "blockcheck.h"
Tao Mac732eb12009-08-18 11:21:00 +080029#include "refcounttree.h"
Tao Ma8bf396d2009-08-24 11:12:02 +080030#include "sysfile.h"
Tao Ma374a2632009-08-24 11:13:37 +080031#include "dlmglue.h"
Tao Mae73a8192009-08-11 14:33:14 +080032#include "extent_map.h"
Tao Ma6f70fa52009-08-25 08:05:12 +080033#include "aops.h"
Tao Ma492a8a32009-08-18 11:43:17 +080034#include "xattr.h"
Tao Ma09bf27a2009-09-21 10:38:17 +080035#include "namei.h"
Tao Ma198aac22011-02-22 08:20:04 +080036#include "ocfs2_trace.h"
Tao Ma6f70fa52009-08-25 08:05:12 +080037
38#include <linux/bio.h>
39#include <linux/blkdev.h>
Tao Ma6f70fa52009-08-25 08:05:12 +080040#include <linux/slab.h>
41#include <linux/writeback.h>
42#include <linux/pagevec.h>
43#include <linux/swap.h>
Tao Mabd508732009-09-21 11:25:14 +080044#include <linux/security.h>
45#include <linux/fsnotify.h>
46#include <linux/quotaops.h>
47#include <linux/namei.h>
48#include <linux/mount.h>
Christoph Hellwig702e5bc2013-12-20 05:16:48 -080049#include <linux/posix_acl.h>
Tao Ma6f70fa52009-08-25 08:05:12 +080050
51struct ocfs2_cow_context {
52 struct inode *inode;
53 u32 cow_start;
54 u32 cow_len;
Tao Ma913580b2009-08-24 14:31:03 +080055 struct ocfs2_extent_tree data_et;
56 struct ocfs2_refcount_tree *ref_tree;
Tao Ma6f70fa52009-08-25 08:05:12 +080057 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;
Tao Ma492a8a32009-08-18 11:43:17 +080061 void *cow_object;
62 struct ocfs2_post_refcount *post_refcount;
63 int extra_credits;
Tao Ma913580b2009-08-24 14:31:03 +080064 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,
Tiger Yangc7dd3392013-08-13 16:00:58 -070069 struct inode *inode,
Tao Ma913580b2009-08-24 14:31:03 +080070 u32 cpos, u32 old_cluster,
71 u32 new_cluster, u32 new_len);
Tao Ma6f70fa52009-08-25 08:05:12 +080072};
Tao Mac732eb12009-08-18 11:21:00 +080073
74static inline struct ocfs2_refcount_tree *
75cache_info_to_refcount(struct ocfs2_caching_info *ci)
76{
77 return container_of(ci, struct ocfs2_refcount_tree, rf_ci);
78}
Tao Maf2c870e2009-08-18 11:19:26 +080079
80static int ocfs2_validate_refcount_block(struct super_block *sb,
81 struct buffer_head *bh)
82{
83 int rc;
84 struct ocfs2_refcount_block *rb =
85 (struct ocfs2_refcount_block *)bh->b_data;
86
Tao Ma198aac22011-02-22 08:20:04 +080087 trace_ocfs2_validate_refcount_block((unsigned long long)bh->b_blocknr);
Tao Maf2c870e2009-08-18 11:19:26 +080088
89 BUG_ON(!buffer_uptodate(bh));
90
91 /*
92 * If the ecc fails, we return the error but otherwise
93 * leave the filesystem running. We know any error is
94 * local to this block.
95 */
96 rc = ocfs2_validate_meta_ecc(sb, bh->b_data, &rb->rf_check);
97 if (rc) {
98 mlog(ML_ERROR, "Checksum failed for refcount block %llu\n",
99 (unsigned long long)bh->b_blocknr);
100 return rc;
101 }
102
103
104 if (!OCFS2_IS_VALID_REFCOUNT_BLOCK(rb)) {
105 ocfs2_error(sb,
106 "Refcount block #%llu has bad signature %.*s",
107 (unsigned long long)bh->b_blocknr, 7,
108 rb->rf_signature);
109 return -EINVAL;
110 }
111
112 if (le64_to_cpu(rb->rf_blkno) != bh->b_blocknr) {
113 ocfs2_error(sb,
114 "Refcount block #%llu has an invalid rf_blkno "
115 "of %llu",
116 (unsigned long long)bh->b_blocknr,
117 (unsigned long long)le64_to_cpu(rb->rf_blkno));
118 return -EINVAL;
119 }
120
121 if (le32_to_cpu(rb->rf_fs_generation) != OCFS2_SB(sb)->fs_generation) {
122 ocfs2_error(sb,
123 "Refcount block #%llu has an invalid "
124 "rf_fs_generation of #%u",
125 (unsigned long long)bh->b_blocknr,
126 le32_to_cpu(rb->rf_fs_generation));
127 return -EINVAL;
128 }
129
130 return 0;
131}
132
133static int ocfs2_read_refcount_block(struct ocfs2_caching_info *ci,
134 u64 rb_blkno,
135 struct buffer_head **bh)
136{
137 int rc;
138 struct buffer_head *tmp = *bh;
139
140 rc = ocfs2_read_block(ci, rb_blkno, &tmp,
141 ocfs2_validate_refcount_block);
142
143 /* If ocfs2_read_block() got us a new bh, pass it up. */
144 if (!rc && !*bh)
145 *bh = tmp;
146
147 return rc;
148}
Tao Mac732eb12009-08-18 11:21:00 +0800149
150static u64 ocfs2_refcount_cache_owner(struct ocfs2_caching_info *ci)
151{
152 struct ocfs2_refcount_tree *rf = cache_info_to_refcount(ci);
153
154 return rf->rf_blkno;
155}
156
157static struct super_block *
158ocfs2_refcount_cache_get_super(struct ocfs2_caching_info *ci)
159{
160 struct ocfs2_refcount_tree *rf = cache_info_to_refcount(ci);
161
162 return rf->rf_sb;
163}
164
165static void ocfs2_refcount_cache_lock(struct ocfs2_caching_info *ci)
166{
167 struct ocfs2_refcount_tree *rf = cache_info_to_refcount(ci);
168
169 spin_lock(&rf->rf_lock);
170}
171
172static void ocfs2_refcount_cache_unlock(struct ocfs2_caching_info *ci)
173{
174 struct ocfs2_refcount_tree *rf = cache_info_to_refcount(ci);
175
176 spin_unlock(&rf->rf_lock);
177}
178
179static void ocfs2_refcount_cache_io_lock(struct ocfs2_caching_info *ci)
180{
181 struct ocfs2_refcount_tree *rf = cache_info_to_refcount(ci);
182
183 mutex_lock(&rf->rf_io_mutex);
184}
185
186static void ocfs2_refcount_cache_io_unlock(struct ocfs2_caching_info *ci)
187{
188 struct ocfs2_refcount_tree *rf = cache_info_to_refcount(ci);
189
190 mutex_unlock(&rf->rf_io_mutex);
191}
192
193static const struct ocfs2_caching_operations ocfs2_refcount_caching_ops = {
194 .co_owner = ocfs2_refcount_cache_owner,
195 .co_get_super = ocfs2_refcount_cache_get_super,
196 .co_cache_lock = ocfs2_refcount_cache_lock,
197 .co_cache_unlock = ocfs2_refcount_cache_unlock,
198 .co_io_lock = ocfs2_refcount_cache_io_lock,
199 .co_io_unlock = ocfs2_refcount_cache_io_unlock,
200};
Tao Ma374a2632009-08-24 11:13:37 +0800201
202static struct ocfs2_refcount_tree *
203ocfs2_find_refcount_tree(struct ocfs2_super *osb, u64 blkno)
204{
205 struct rb_node *n = osb->osb_rf_lock_tree.rb_node;
206 struct ocfs2_refcount_tree *tree = NULL;
207
208 while (n) {
209 tree = rb_entry(n, struct ocfs2_refcount_tree, rf_node);
210
211 if (blkno < tree->rf_blkno)
212 n = n->rb_left;
213 else if (blkno > tree->rf_blkno)
214 n = n->rb_right;
215 else
216 return tree;
217 }
218
219 return NULL;
220}
221
222/* osb_lock is already locked. */
223static void ocfs2_insert_refcount_tree(struct ocfs2_super *osb,
224 struct ocfs2_refcount_tree *new)
225{
226 u64 rf_blkno = new->rf_blkno;
227 struct rb_node *parent = NULL;
228 struct rb_node **p = &osb->osb_rf_lock_tree.rb_node;
229 struct ocfs2_refcount_tree *tmp;
230
231 while (*p) {
232 parent = *p;
233
234 tmp = rb_entry(parent, struct ocfs2_refcount_tree,
235 rf_node);
236
237 if (rf_blkno < tmp->rf_blkno)
238 p = &(*p)->rb_left;
239 else if (rf_blkno > tmp->rf_blkno)
240 p = &(*p)->rb_right;
241 else {
242 /* This should never happen! */
243 mlog(ML_ERROR, "Duplicate refcount block %llu found!\n",
244 (unsigned long long)rf_blkno);
245 BUG();
246 }
247 }
248
249 rb_link_node(&new->rf_node, parent, p);
250 rb_insert_color(&new->rf_node, &osb->osb_rf_lock_tree);
251}
252
253static void ocfs2_free_refcount_tree(struct ocfs2_refcount_tree *tree)
254{
255 ocfs2_metadata_cache_exit(&tree->rf_ci);
256 ocfs2_simple_drop_lockres(OCFS2_SB(tree->rf_sb), &tree->rf_lockres);
257 ocfs2_lock_res_free(&tree->rf_lockres);
258 kfree(tree);
259}
260
261static inline void
262ocfs2_erase_refcount_tree_from_list_no_lock(struct ocfs2_super *osb,
263 struct ocfs2_refcount_tree *tree)
264{
265 rb_erase(&tree->rf_node, &osb->osb_rf_lock_tree);
266 if (osb->osb_ref_tree_lru && osb->osb_ref_tree_lru == tree)
267 osb->osb_ref_tree_lru = NULL;
268}
269
270static void ocfs2_erase_refcount_tree_from_list(struct ocfs2_super *osb,
271 struct ocfs2_refcount_tree *tree)
272{
273 spin_lock(&osb->osb_lock);
274 ocfs2_erase_refcount_tree_from_list_no_lock(osb, tree);
275 spin_unlock(&osb->osb_lock);
276}
277
Tao Ma12d4cec2009-11-30 15:08:40 +0800278static void ocfs2_kref_remove_refcount_tree(struct kref *kref)
Tao Ma374a2632009-08-24 11:13:37 +0800279{
280 struct ocfs2_refcount_tree *tree =
281 container_of(kref, struct ocfs2_refcount_tree, rf_getcnt);
282
283 ocfs2_free_refcount_tree(tree);
284}
285
286static inline void
287ocfs2_refcount_tree_get(struct ocfs2_refcount_tree *tree)
288{
289 kref_get(&tree->rf_getcnt);
290}
291
292static inline void
293ocfs2_refcount_tree_put(struct ocfs2_refcount_tree *tree)
294{
295 kref_put(&tree->rf_getcnt, ocfs2_kref_remove_refcount_tree);
296}
297
298static inline void ocfs2_init_refcount_tree_ci(struct ocfs2_refcount_tree *new,
299 struct super_block *sb)
300{
301 ocfs2_metadata_cache_init(&new->rf_ci, &ocfs2_refcount_caching_ops);
302 mutex_init(&new->rf_io_mutex);
303 new->rf_sb = sb;
304 spin_lock_init(&new->rf_lock);
305}
306
307static inline void ocfs2_init_refcount_tree_lock(struct ocfs2_super *osb,
308 struct ocfs2_refcount_tree *new,
309 u64 rf_blkno, u32 generation)
310{
311 init_rwsem(&new->rf_sem);
312 ocfs2_refcount_lock_res_init(&new->rf_lockres, osb,
313 rf_blkno, generation);
314}
315
Tao Ma8bf396d2009-08-24 11:12:02 +0800316static struct ocfs2_refcount_tree*
317ocfs2_allocate_refcount_tree(struct ocfs2_super *osb, u64 rf_blkno)
318{
319 struct ocfs2_refcount_tree *new;
320
321 new = kzalloc(sizeof(struct ocfs2_refcount_tree), GFP_NOFS);
322 if (!new)
323 return NULL;
324
325 new->rf_blkno = rf_blkno;
326 kref_init(&new->rf_getcnt);
327 ocfs2_init_refcount_tree_ci(new, osb->sb);
328
329 return new;
330}
331
Tao Ma374a2632009-08-24 11:13:37 +0800332static int ocfs2_get_refcount_tree(struct ocfs2_super *osb, u64 rf_blkno,
333 struct ocfs2_refcount_tree **ret_tree)
334{
335 int ret = 0;
336 struct ocfs2_refcount_tree *tree, *new = NULL;
337 struct buffer_head *ref_root_bh = NULL;
338 struct ocfs2_refcount_block *ref_rb;
339
340 spin_lock(&osb->osb_lock);
341 if (osb->osb_ref_tree_lru &&
342 osb->osb_ref_tree_lru->rf_blkno == rf_blkno)
343 tree = osb->osb_ref_tree_lru;
344 else
345 tree = ocfs2_find_refcount_tree(osb, rf_blkno);
346 if (tree)
347 goto out;
348
349 spin_unlock(&osb->osb_lock);
350
Tao Ma8bf396d2009-08-24 11:12:02 +0800351 new = ocfs2_allocate_refcount_tree(osb, rf_blkno);
Tao Ma374a2632009-08-24 11:13:37 +0800352 if (!new) {
353 ret = -ENOMEM;
Tao Ma8bf396d2009-08-24 11:12:02 +0800354 mlog_errno(ret);
Tao Ma374a2632009-08-24 11:13:37 +0800355 return ret;
356 }
Tao Ma374a2632009-08-24 11:13:37 +0800357 /*
358 * We need the generation to create the refcount tree lock and since
359 * it isn't changed during the tree modification, we are safe here to
360 * read without protection.
361 * We also have to purge the cache after we create the lock since the
362 * refcount block may have the stale data. It can only be trusted when
363 * we hold the refcount lock.
364 */
365 ret = ocfs2_read_refcount_block(&new->rf_ci, rf_blkno, &ref_root_bh);
366 if (ret) {
367 mlog_errno(ret);
368 ocfs2_metadata_cache_exit(&new->rf_ci);
369 kfree(new);
370 return ret;
371 }
372
373 ref_rb = (struct ocfs2_refcount_block *)ref_root_bh->b_data;
374 new->rf_generation = le32_to_cpu(ref_rb->rf_generation);
375 ocfs2_init_refcount_tree_lock(osb, new, rf_blkno,
376 new->rf_generation);
377 ocfs2_metadata_cache_purge(&new->rf_ci);
378
379 spin_lock(&osb->osb_lock);
380 tree = ocfs2_find_refcount_tree(osb, rf_blkno);
381 if (tree)
382 goto out;
383
384 ocfs2_insert_refcount_tree(osb, new);
385
386 tree = new;
387 new = NULL;
388
389out:
390 *ret_tree = tree;
391
392 osb->osb_ref_tree_lru = tree;
393
394 spin_unlock(&osb->osb_lock);
395
396 if (new)
397 ocfs2_free_refcount_tree(new);
398
399 brelse(ref_root_bh);
400 return ret;
401}
402
403static int ocfs2_get_refcount_block(struct inode *inode, u64 *ref_blkno)
404{
405 int ret;
406 struct buffer_head *di_bh = NULL;
407 struct ocfs2_dinode *di;
408
409 ret = ocfs2_read_inode_block(inode, &di_bh);
410 if (ret) {
411 mlog_errno(ret);
412 goto out;
413 }
414
415 BUG_ON(!(OCFS2_I(inode)->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL));
416
417 di = (struct ocfs2_dinode *)di_bh->b_data;
418 *ref_blkno = le64_to_cpu(di->i_refcount_loc);
419 brelse(di_bh);
420out:
421 return ret;
422}
423
424static int __ocfs2_lock_refcount_tree(struct ocfs2_super *osb,
425 struct ocfs2_refcount_tree *tree, int rw)
426{
427 int ret;
428
429 ret = ocfs2_refcount_lock(tree, rw);
430 if (ret) {
431 mlog_errno(ret);
432 goto out;
433 }
434
435 if (rw)
436 down_write(&tree->rf_sem);
437 else
438 down_read(&tree->rf_sem);
439
440out:
441 return ret;
442}
443
444/*
445 * Lock the refcount tree pointed by ref_blkno and return the tree.
446 * In most case, we lock the tree and read the refcount block.
447 * So read it here if the caller really needs it.
448 *
449 * If the tree has been re-created by other node, it will free the
450 * old one and re-create it.
451 */
452int ocfs2_lock_refcount_tree(struct ocfs2_super *osb,
453 u64 ref_blkno, int rw,
454 struct ocfs2_refcount_tree **ret_tree,
455 struct buffer_head **ref_bh)
456{
457 int ret, delete_tree = 0;
458 struct ocfs2_refcount_tree *tree = NULL;
459 struct buffer_head *ref_root_bh = NULL;
460 struct ocfs2_refcount_block *rb;
461
462again:
463 ret = ocfs2_get_refcount_tree(osb, ref_blkno, &tree);
464 if (ret) {
465 mlog_errno(ret);
466 return ret;
467 }
468
469 ocfs2_refcount_tree_get(tree);
470
471 ret = __ocfs2_lock_refcount_tree(osb, tree, rw);
472 if (ret) {
473 mlog_errno(ret);
474 ocfs2_refcount_tree_put(tree);
475 goto out;
476 }
477
478 ret = ocfs2_read_refcount_block(&tree->rf_ci, tree->rf_blkno,
479 &ref_root_bh);
480 if (ret) {
481 mlog_errno(ret);
482 ocfs2_unlock_refcount_tree(osb, tree, rw);
483 ocfs2_refcount_tree_put(tree);
484 goto out;
485 }
486
487 rb = (struct ocfs2_refcount_block *)ref_root_bh->b_data;
488 /*
489 * If the refcount block has been freed and re-created, we may need
490 * to recreate the refcount tree also.
491 *
492 * Here we just remove the tree from the rb-tree, and the last
493 * kref holder will unlock and delete this refcount_tree.
494 * Then we goto "again" and ocfs2_get_refcount_tree will create
495 * the new refcount tree for us.
496 */
497 if (tree->rf_generation != le32_to_cpu(rb->rf_generation)) {
498 if (!tree->rf_removed) {
499 ocfs2_erase_refcount_tree_from_list(osb, tree);
500 tree->rf_removed = 1;
501 delete_tree = 1;
502 }
503
504 ocfs2_unlock_refcount_tree(osb, tree, rw);
505 /*
506 * We get an extra reference when we create the refcount
507 * tree, so another put will destroy it.
508 */
509 if (delete_tree)
510 ocfs2_refcount_tree_put(tree);
511 brelse(ref_root_bh);
512 ref_root_bh = NULL;
513 goto again;
514 }
515
516 *ret_tree = tree;
517 if (ref_bh) {
518 *ref_bh = ref_root_bh;
519 ref_root_bh = NULL;
520 }
521out:
522 brelse(ref_root_bh);
523 return ret;
524}
525
Tao Ma374a2632009-08-24 11:13:37 +0800526void ocfs2_unlock_refcount_tree(struct ocfs2_super *osb,
527 struct ocfs2_refcount_tree *tree, int rw)
528{
529 if (rw)
530 up_write(&tree->rf_sem);
531 else
532 up_read(&tree->rf_sem);
533
534 ocfs2_refcount_unlock(tree, rw);
535 ocfs2_refcount_tree_put(tree);
536}
537
538void ocfs2_purge_refcount_trees(struct ocfs2_super *osb)
539{
540 struct rb_node *node;
541 struct ocfs2_refcount_tree *tree;
542 struct rb_root *root = &osb->osb_rf_lock_tree;
543
544 while ((node = rb_last(root)) != NULL) {
545 tree = rb_entry(node, struct ocfs2_refcount_tree, rf_node);
546
Tao Ma198aac22011-02-22 08:20:04 +0800547 trace_ocfs2_purge_refcount_trees(
548 (unsigned long long) tree->rf_blkno);
Tao Ma374a2632009-08-24 11:13:37 +0800549
550 rb_erase(&tree->rf_node, root);
551 ocfs2_free_refcount_tree(tree);
552 }
553}
Tao Ma8bf396d2009-08-24 11:12:02 +0800554
555/*
556 * Create a refcount tree for an inode.
557 * We take for granted that the inode is already locked.
558 */
559static int ocfs2_create_refcount_tree(struct inode *inode,
560 struct buffer_head *di_bh)
561{
562 int ret;
563 handle_t *handle = NULL;
564 struct ocfs2_alloc_context *meta_ac = NULL;
565 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
566 struct ocfs2_inode_info *oi = OCFS2_I(inode);
567 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
568 struct buffer_head *new_bh = NULL;
569 struct ocfs2_refcount_block *rb;
570 struct ocfs2_refcount_tree *new_tree = NULL, *tree = NULL;
571 u16 suballoc_bit_start;
572 u32 num_got;
Joel Becker2b6cb572010-03-26 10:09:15 +0800573 u64 suballoc_loc, first_blkno;
Tao Ma8bf396d2009-08-24 11:12:02 +0800574
575 BUG_ON(oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL);
576
Tao Ma198aac22011-02-22 08:20:04 +0800577 trace_ocfs2_create_refcount_tree(
578 (unsigned long long)OCFS2_I(inode)->ip_blkno);
Tao Ma8bf396d2009-08-24 11:12:02 +0800579
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
Joel Becker2b6cb572010-03-26 10:09:15 +0800600 ret = ocfs2_claim_metadata(handle, meta_ac, 1, &suballoc_loc,
Tao Ma8bf396d2009-08-24 11:12:02 +0800601 &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);
Rui Xiang58796202013-11-12 15:06:55 -0800616 if (!new_bh) {
617 ret = -ENOMEM;
618 mlog_errno(ret);
619 goto out_commit;
620 }
Tao Ma8bf396d2009-08-24 11:12:02 +0800621 ocfs2_set_new_buffer_uptodate(&new_tree->rf_ci, new_bh);
622
623 ret = ocfs2_journal_access_rb(handle, &new_tree->rf_ci, new_bh,
624 OCFS2_JOURNAL_ACCESS_CREATE);
625 if (ret) {
626 mlog_errno(ret);
627 goto out_commit;
628 }
629
630 /* Initialize ocfs2_refcount_block. */
631 rb = (struct ocfs2_refcount_block *)new_bh->b_data;
632 memset(rb, 0, inode->i_sb->s_blocksize);
633 strcpy((void *)rb, OCFS2_REFCOUNT_BLOCK_SIGNATURE);
Tiger Yangb89c5422010-01-25 14:11:06 +0800634 rb->rf_suballoc_slot = cpu_to_le16(meta_ac->ac_alloc_slot);
Joel Becker2b6cb572010-03-26 10:09:15 +0800635 rb->rf_suballoc_loc = cpu_to_le64(suballoc_loc);
Tao Ma8bf396d2009-08-24 11:12:02 +0800636 rb->rf_suballoc_bit = cpu_to_le16(suballoc_bit_start);
637 rb->rf_fs_generation = cpu_to_le32(osb->fs_generation);
638 rb->rf_blkno = cpu_to_le64(first_blkno);
639 rb->rf_count = cpu_to_le32(1);
640 rb->rf_records.rl_count =
641 cpu_to_le16(ocfs2_refcount_recs_per_rb(osb->sb));
642 spin_lock(&osb->osb_lock);
643 rb->rf_generation = osb->s_next_generation++;
644 spin_unlock(&osb->osb_lock);
645
646 ocfs2_journal_dirty(handle, new_bh);
647
648 spin_lock(&oi->ip_lock);
649 oi->ip_dyn_features |= OCFS2_HAS_REFCOUNT_FL;
650 di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
651 di->i_refcount_loc = cpu_to_le64(first_blkno);
652 spin_unlock(&oi->ip_lock);
653
Tao Ma198aac22011-02-22 08:20:04 +0800654 trace_ocfs2_create_refcount_tree_blkno((unsigned long long)first_blkno);
Tao Ma8bf396d2009-08-24 11:12:02 +0800655
656 ocfs2_journal_dirty(handle, di_bh);
657
658 /*
659 * We have to init the tree lock here since it will use
660 * the generation number to create it.
661 */
662 new_tree->rf_generation = le32_to_cpu(rb->rf_generation);
663 ocfs2_init_refcount_tree_lock(osb, new_tree, first_blkno,
664 new_tree->rf_generation);
665
666 spin_lock(&osb->osb_lock);
667 tree = ocfs2_find_refcount_tree(osb, first_blkno);
668
669 /*
670 * We've just created a new refcount tree in this block. If
671 * we found a refcount tree on the ocfs2_super, it must be
672 * one we just deleted. We free the old tree before
673 * inserting the new tree.
674 */
675 BUG_ON(tree && tree->rf_generation == new_tree->rf_generation);
676 if (tree)
677 ocfs2_erase_refcount_tree_from_list_no_lock(osb, tree);
678 ocfs2_insert_refcount_tree(osb, new_tree);
679 spin_unlock(&osb->osb_lock);
680 new_tree = NULL;
681 if (tree)
682 ocfs2_refcount_tree_put(tree);
683
684out_commit:
685 ocfs2_commit_trans(osb, handle);
686
687out:
688 if (new_tree) {
689 ocfs2_metadata_cache_exit(&new_tree->rf_ci);
690 kfree(new_tree);
691 }
692
693 brelse(new_bh);
694 if (meta_ac)
695 ocfs2_free_alloc_context(meta_ac);
696
697 return ret;
698}
699
700static int ocfs2_set_refcount_tree(struct inode *inode,
701 struct buffer_head *di_bh,
702 u64 refcount_loc)
703{
704 int ret;
705 handle_t *handle = NULL;
706 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
707 struct ocfs2_inode_info *oi = OCFS2_I(inode);
708 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
709 struct buffer_head *ref_root_bh = NULL;
710 struct ocfs2_refcount_block *rb;
711 struct ocfs2_refcount_tree *ref_tree;
712
713 BUG_ON(oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL);
714
715 ret = ocfs2_lock_refcount_tree(osb, refcount_loc, 1,
716 &ref_tree, &ref_root_bh);
717 if (ret) {
718 mlog_errno(ret);
719 return ret;
720 }
721
722 handle = ocfs2_start_trans(osb, OCFS2_REFCOUNT_TREE_SET_CREDITS);
723 if (IS_ERR(handle)) {
724 ret = PTR_ERR(handle);
725 mlog_errno(ret);
726 goto out;
727 }
728
729 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
730 OCFS2_JOURNAL_ACCESS_WRITE);
731 if (ret) {
732 mlog_errno(ret);
733 goto out_commit;
734 }
735
736 ret = ocfs2_journal_access_rb(handle, &ref_tree->rf_ci, ref_root_bh,
737 OCFS2_JOURNAL_ACCESS_WRITE);
738 if (ret) {
739 mlog_errno(ret);
740 goto out_commit;
741 }
742
743 rb = (struct ocfs2_refcount_block *)ref_root_bh->b_data;
744 le32_add_cpu(&rb->rf_count, 1);
745
746 ocfs2_journal_dirty(handle, ref_root_bh);
747
748 spin_lock(&oi->ip_lock);
749 oi->ip_dyn_features |= OCFS2_HAS_REFCOUNT_FL;
750 di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
751 di->i_refcount_loc = cpu_to_le64(refcount_loc);
752 spin_unlock(&oi->ip_lock);
753 ocfs2_journal_dirty(handle, di_bh);
754
755out_commit:
756 ocfs2_commit_trans(osb, handle);
757out:
758 ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
759 brelse(ref_root_bh);
760
761 return ret;
762}
763
764int ocfs2_remove_refcount_tree(struct inode *inode, struct buffer_head *di_bh)
765{
766 int ret, delete_tree = 0;
767 handle_t *handle = NULL;
768 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
769 struct ocfs2_inode_info *oi = OCFS2_I(inode);
770 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
771 struct ocfs2_refcount_block *rb;
772 struct inode *alloc_inode = NULL;
773 struct buffer_head *alloc_bh = NULL;
774 struct buffer_head *blk_bh = NULL;
775 struct ocfs2_refcount_tree *ref_tree;
776 int credits = OCFS2_REFCOUNT_TREE_REMOVE_CREDITS;
777 u64 blk = 0, bg_blkno = 0, ref_blkno = le64_to_cpu(di->i_refcount_loc);
778 u16 bit = 0;
779
780 if (!(oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL))
781 return 0;
782
783 BUG_ON(!ref_blkno);
784 ret = ocfs2_lock_refcount_tree(osb, ref_blkno, 1, &ref_tree, &blk_bh);
785 if (ret) {
786 mlog_errno(ret);
787 return ret;
788 }
789
790 rb = (struct ocfs2_refcount_block *)blk_bh->b_data;
791
792 /*
793 * If we are the last user, we need to free the block.
794 * So lock the allocator ahead.
795 */
796 if (le32_to_cpu(rb->rf_count) == 1) {
797 blk = le64_to_cpu(rb->rf_blkno);
798 bit = le16_to_cpu(rb->rf_suballoc_bit);
Tao Ma74380c42010-03-22 14:20:18 +0800799 if (rb->rf_suballoc_loc)
800 bg_blkno = le64_to_cpu(rb->rf_suballoc_loc);
801 else
802 bg_blkno = ocfs2_which_suballoc_group(blk, bit);
Tao Ma8bf396d2009-08-24 11:12:02 +0800803
804 alloc_inode = ocfs2_get_system_file_inode(osb,
805 EXTENT_ALLOC_SYSTEM_INODE,
806 le16_to_cpu(rb->rf_suballoc_slot));
807 if (!alloc_inode) {
808 ret = -ENOMEM;
809 mlog_errno(ret);
810 goto out;
811 }
812 mutex_lock(&alloc_inode->i_mutex);
813
814 ret = ocfs2_inode_lock(alloc_inode, &alloc_bh, 1);
815 if (ret) {
816 mlog_errno(ret);
817 goto out_mutex;
818 }
819
820 credits += OCFS2_SUBALLOC_FREE;
821 }
822
823 handle = ocfs2_start_trans(osb, credits);
824 if (IS_ERR(handle)) {
825 ret = PTR_ERR(handle);
826 mlog_errno(ret);
827 goto out_unlock;
828 }
829
830 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
831 OCFS2_JOURNAL_ACCESS_WRITE);
832 if (ret) {
833 mlog_errno(ret);
834 goto out_commit;
835 }
836
837 ret = ocfs2_journal_access_rb(handle, &ref_tree->rf_ci, blk_bh,
838 OCFS2_JOURNAL_ACCESS_WRITE);
839 if (ret) {
840 mlog_errno(ret);
841 goto out_commit;
842 }
843
844 spin_lock(&oi->ip_lock);
845 oi->ip_dyn_features &= ~OCFS2_HAS_REFCOUNT_FL;
846 di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
847 di->i_refcount_loc = 0;
848 spin_unlock(&oi->ip_lock);
849 ocfs2_journal_dirty(handle, di_bh);
850
851 le32_add_cpu(&rb->rf_count , -1);
852 ocfs2_journal_dirty(handle, blk_bh);
853
854 if (!rb->rf_count) {
855 delete_tree = 1;
856 ocfs2_erase_refcount_tree_from_list(osb, ref_tree);
857 ret = ocfs2_free_suballoc_bits(handle, alloc_inode,
858 alloc_bh, bit, bg_blkno, 1);
859 if (ret)
860 mlog_errno(ret);
861 }
862
863out_commit:
864 ocfs2_commit_trans(osb, handle);
865out_unlock:
866 if (alloc_inode) {
867 ocfs2_inode_unlock(alloc_inode, 1);
868 brelse(alloc_bh);
869 }
870out_mutex:
871 if (alloc_inode) {
872 mutex_unlock(&alloc_inode->i_mutex);
873 iput(alloc_inode);
874 }
875out:
876 ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
877 if (delete_tree)
878 ocfs2_refcount_tree_put(ref_tree);
879 brelse(blk_bh);
880
881 return ret;
882}
Tao Mae73a8192009-08-11 14:33:14 +0800883
884static void ocfs2_find_refcount_rec_in_rl(struct ocfs2_caching_info *ci,
885 struct buffer_head *ref_leaf_bh,
886 u64 cpos, unsigned int len,
887 struct ocfs2_refcount_rec *ret_rec,
888 int *index)
889{
890 int i = 0;
891 struct ocfs2_refcount_block *rb =
892 (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
893 struct ocfs2_refcount_rec *rec = NULL;
894
895 for (; i < le16_to_cpu(rb->rf_records.rl_used); i++) {
896 rec = &rb->rf_records.rl_recs[i];
897
898 if (le64_to_cpu(rec->r_cpos) +
899 le32_to_cpu(rec->r_clusters) <= cpos)
900 continue;
901 else if (le64_to_cpu(rec->r_cpos) > cpos)
902 break;
903
904 /* ok, cpos fail in this rec. Just return. */
905 if (ret_rec)
906 *ret_rec = *rec;
907 goto out;
908 }
909
910 if (ret_rec) {
911 /* We meet with a hole here, so fake the rec. */
912 ret_rec->r_cpos = cpu_to_le64(cpos);
913 ret_rec->r_refcount = 0;
914 if (i < le16_to_cpu(rb->rf_records.rl_used) &&
915 le64_to_cpu(rec->r_cpos) < cpos + len)
916 ret_rec->r_clusters =
917 cpu_to_le32(le64_to_cpu(rec->r_cpos) - cpos);
918 else
919 ret_rec->r_clusters = cpu_to_le32(len);
920 }
921
922out:
923 *index = i;
924}
925
926/*
Tao Ma8b2c0db2009-08-18 11:43:49 +0800927 * Try to remove refcount tree. The mechanism is:
928 * 1) Check whether i_clusters == 0, if no, exit.
929 * 2) check whether we have i_xattr_loc in dinode. if yes, exit.
930 * 3) Check whether we have inline xattr stored outside, if yes, exit.
931 * 4) Remove the tree.
932 */
933int ocfs2_try_remove_refcount_tree(struct inode *inode,
934 struct buffer_head *di_bh)
935{
936 int ret;
937 struct ocfs2_inode_info *oi = OCFS2_I(inode);
938 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
939
940 down_write(&oi->ip_xattr_sem);
941 down_write(&oi->ip_alloc_sem);
942
943 if (oi->ip_clusters)
944 goto out;
945
946 if ((oi->ip_dyn_features & OCFS2_HAS_XATTR_FL) && di->i_xattr_loc)
947 goto out;
948
949 if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL &&
950 ocfs2_has_inline_xattr_value_outside(inode, di))
951 goto out;
952
953 ret = ocfs2_remove_refcount_tree(inode, di_bh);
954 if (ret)
955 mlog_errno(ret);
956out:
957 up_write(&oi->ip_alloc_sem);
958 up_write(&oi->ip_xattr_sem);
959 return 0;
960}
961
962/*
Tao Ma38a04e42009-11-30 14:32:19 +0800963 * Find the end range for a leaf refcount block indicated by
964 * el->l_recs[index].e_blkno.
965 */
966static int ocfs2_get_refcount_cpos_end(struct ocfs2_caching_info *ci,
967 struct buffer_head *ref_root_bh,
968 struct ocfs2_extent_block *eb,
969 struct ocfs2_extent_list *el,
970 int index, u32 *cpos_end)
971{
972 int ret, i, subtree_root;
973 u32 cpos;
974 u64 blkno;
975 struct super_block *sb = ocfs2_metadata_cache_get_super(ci);
976 struct ocfs2_path *left_path = NULL, *right_path = NULL;
977 struct ocfs2_extent_tree et;
978 struct ocfs2_extent_list *tmp_el;
979
980 if (index < le16_to_cpu(el->l_next_free_rec) - 1) {
981 /*
982 * We have a extent rec after index, so just use the e_cpos
983 * of the next extent rec.
984 */
985 *cpos_end = le32_to_cpu(el->l_recs[index+1].e_cpos);
986 return 0;
987 }
988
989 if (!eb || (eb && !eb->h_next_leaf_blk)) {
990 /*
991 * We are the last extent rec, so any high cpos should
992 * be stored in this leaf refcount block.
993 */
994 *cpos_end = UINT_MAX;
995 return 0;
996 }
997
998 /*
999 * If the extent block isn't the last one, we have to find
1000 * the subtree root between this extent block and the next
1001 * leaf extent block and get the corresponding e_cpos from
1002 * the subroot. Otherwise we may corrupt the b-tree.
1003 */
1004 ocfs2_init_refcount_extent_tree(&et, ci, ref_root_bh);
1005
1006 left_path = ocfs2_new_path_from_et(&et);
1007 if (!left_path) {
1008 ret = -ENOMEM;
1009 mlog_errno(ret);
1010 goto out;
1011 }
1012
1013 cpos = le32_to_cpu(eb->h_list.l_recs[index].e_cpos);
1014 ret = ocfs2_find_path(ci, left_path, cpos);
1015 if (ret) {
1016 mlog_errno(ret);
1017 goto out;
1018 }
1019
1020 right_path = ocfs2_new_path_from_path(left_path);
1021 if (!right_path) {
1022 ret = -ENOMEM;
1023 mlog_errno(ret);
1024 goto out;
1025 }
1026
1027 ret = ocfs2_find_cpos_for_right_leaf(sb, left_path, &cpos);
1028 if (ret) {
1029 mlog_errno(ret);
1030 goto out;
1031 }
1032
1033 ret = ocfs2_find_path(ci, right_path, cpos);
1034 if (ret) {
1035 mlog_errno(ret);
1036 goto out;
1037 }
1038
1039 subtree_root = ocfs2_find_subtree_root(&et, left_path,
1040 right_path);
1041
1042 tmp_el = left_path->p_node[subtree_root].el;
1043 blkno = left_path->p_node[subtree_root+1].bh->b_blocknr;
Al Viro3a251f02012-04-13 12:22:00 -04001044 for (i = 0; i < le16_to_cpu(tmp_el->l_next_free_rec); i++) {
Tao Ma38a04e42009-11-30 14:32:19 +08001045 if (le64_to_cpu(tmp_el->l_recs[i].e_blkno) == blkno) {
1046 *cpos_end = le32_to_cpu(tmp_el->l_recs[i+1].e_cpos);
1047 break;
1048 }
1049 }
1050
Al Viro3a251f02012-04-13 12:22:00 -04001051 BUG_ON(i == le16_to_cpu(tmp_el->l_next_free_rec));
Tao Ma38a04e42009-11-30 14:32:19 +08001052
1053out:
1054 ocfs2_free_path(left_path);
1055 ocfs2_free_path(right_path);
1056 return ret;
1057}
1058
1059/*
Tao Mae73a8192009-08-11 14:33:14 +08001060 * Given a cpos and len, try to find the refcount record which contains cpos.
1061 * 1. If cpos can be found in one refcount record, return the record.
1062 * 2. If cpos can't be found, return a fake record which start from cpos
1063 * and end at a small value between cpos+len and start of the next record.
1064 * This fake record has r_refcount = 0.
1065 */
1066static int ocfs2_get_refcount_rec(struct ocfs2_caching_info *ci,
1067 struct buffer_head *ref_root_bh,
1068 u64 cpos, unsigned int len,
1069 struct ocfs2_refcount_rec *ret_rec,
1070 int *index,
1071 struct buffer_head **ret_bh)
1072{
1073 int ret = 0, i, found;
Tao Ma38a04e42009-11-30 14:32:19 +08001074 u32 low_cpos, uninitialized_var(cpos_end);
Tao Mae73a8192009-08-11 14:33:14 +08001075 struct ocfs2_extent_list *el;
Tao Ma38a04e42009-11-30 14:32:19 +08001076 struct ocfs2_extent_rec *rec = NULL;
1077 struct ocfs2_extent_block *eb = NULL;
Tao Mae73a8192009-08-11 14:33:14 +08001078 struct buffer_head *eb_bh = NULL, *ref_leaf_bh = NULL;
1079 struct super_block *sb = ocfs2_metadata_cache_get_super(ci);
1080 struct ocfs2_refcount_block *rb =
1081 (struct ocfs2_refcount_block *)ref_root_bh->b_data;
1082
1083 if (!(le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL)) {
1084 ocfs2_find_refcount_rec_in_rl(ci, ref_root_bh, cpos, len,
1085 ret_rec, index);
1086 *ret_bh = ref_root_bh;
1087 get_bh(ref_root_bh);
1088 return 0;
1089 }
1090
1091 el = &rb->rf_list;
1092 low_cpos = cpos & OCFS2_32BIT_POS_MASK;
1093
1094 if (el->l_tree_depth) {
1095 ret = ocfs2_find_leaf(ci, el, low_cpos, &eb_bh);
1096 if (ret) {
1097 mlog_errno(ret);
1098 goto out;
1099 }
1100
1101 eb = (struct ocfs2_extent_block *) eb_bh->b_data;
1102 el = &eb->h_list;
1103
1104 if (el->l_tree_depth) {
1105 ocfs2_error(sb,
1106 "refcount tree %llu has non zero tree "
1107 "depth in leaf btree tree block %llu\n",
1108 (unsigned long long)ocfs2_metadata_cache_owner(ci),
1109 (unsigned long long)eb_bh->b_blocknr);
1110 ret = -EROFS;
1111 goto out;
1112 }
1113 }
1114
1115 found = 0;
1116 for (i = le16_to_cpu(el->l_next_free_rec) - 1; i >= 0; i--) {
1117 rec = &el->l_recs[i];
1118
1119 if (le32_to_cpu(rec->e_cpos) <= low_cpos) {
1120 found = 1;
1121 break;
1122 }
1123 }
1124
Tao Ma38a04e42009-11-30 14:32:19 +08001125 if (found) {
1126 ret = ocfs2_get_refcount_cpos_end(ci, ref_root_bh,
1127 eb, el, i, &cpos_end);
1128 if (ret) {
1129 mlog_errno(ret);
1130 goto out;
1131 }
Tao Mae73a8192009-08-11 14:33:14 +08001132
Tao Ma38a04e42009-11-30 14:32:19 +08001133 if (cpos_end < low_cpos + len)
1134 len = cpos_end - low_cpos;
Tao Mae73a8192009-08-11 14:33:14 +08001135 }
1136
1137 ret = ocfs2_read_refcount_block(ci, le64_to_cpu(rec->e_blkno),
1138 &ref_leaf_bh);
1139 if (ret) {
1140 mlog_errno(ret);
1141 goto out;
1142 }
1143
1144 ocfs2_find_refcount_rec_in_rl(ci, ref_leaf_bh, cpos, len,
1145 ret_rec, index);
1146 *ret_bh = ref_leaf_bh;
1147out:
1148 brelse(eb_bh);
1149 return ret;
1150}
1151
1152enum ocfs2_ref_rec_contig {
1153 REF_CONTIG_NONE = 0,
1154 REF_CONTIG_LEFT,
1155 REF_CONTIG_RIGHT,
1156 REF_CONTIG_LEFTRIGHT,
1157};
1158
1159static enum ocfs2_ref_rec_contig
1160 ocfs2_refcount_rec_adjacent(struct ocfs2_refcount_block *rb,
1161 int index)
1162{
1163 if ((rb->rf_records.rl_recs[index].r_refcount ==
1164 rb->rf_records.rl_recs[index + 1].r_refcount) &&
1165 (le64_to_cpu(rb->rf_records.rl_recs[index].r_cpos) +
1166 le32_to_cpu(rb->rf_records.rl_recs[index].r_clusters) ==
1167 le64_to_cpu(rb->rf_records.rl_recs[index + 1].r_cpos)))
1168 return REF_CONTIG_RIGHT;
1169
1170 return REF_CONTIG_NONE;
1171}
1172
1173static enum ocfs2_ref_rec_contig
1174 ocfs2_refcount_rec_contig(struct ocfs2_refcount_block *rb,
1175 int index)
1176{
1177 enum ocfs2_ref_rec_contig ret = REF_CONTIG_NONE;
1178
1179 if (index < le16_to_cpu(rb->rf_records.rl_used) - 1)
1180 ret = ocfs2_refcount_rec_adjacent(rb, index);
1181
1182 if (index > 0) {
1183 enum ocfs2_ref_rec_contig tmp;
1184
1185 tmp = ocfs2_refcount_rec_adjacent(rb, index - 1);
1186
1187 if (tmp == REF_CONTIG_RIGHT) {
1188 if (ret == REF_CONTIG_RIGHT)
1189 ret = REF_CONTIG_LEFTRIGHT;
1190 else
1191 ret = REF_CONTIG_LEFT;
1192 }
1193 }
1194
1195 return ret;
1196}
1197
1198static void ocfs2_rotate_refcount_rec_left(struct ocfs2_refcount_block *rb,
1199 int index)
1200{
1201 BUG_ON(rb->rf_records.rl_recs[index].r_refcount !=
1202 rb->rf_records.rl_recs[index+1].r_refcount);
1203
1204 le32_add_cpu(&rb->rf_records.rl_recs[index].r_clusters,
1205 le32_to_cpu(rb->rf_records.rl_recs[index+1].r_clusters));
1206
1207 if (index < le16_to_cpu(rb->rf_records.rl_used) - 2)
1208 memmove(&rb->rf_records.rl_recs[index + 1],
1209 &rb->rf_records.rl_recs[index + 2],
1210 sizeof(struct ocfs2_refcount_rec) *
1211 (le16_to_cpu(rb->rf_records.rl_used) - index - 2));
1212
1213 memset(&rb->rf_records.rl_recs[le16_to_cpu(rb->rf_records.rl_used) - 1],
1214 0, sizeof(struct ocfs2_refcount_rec));
1215 le16_add_cpu(&rb->rf_records.rl_used, -1);
1216}
1217
1218/*
1219 * Merge the refcount rec if we are contiguous with the adjacent recs.
1220 */
1221static void ocfs2_refcount_rec_merge(struct ocfs2_refcount_block *rb,
1222 int index)
1223{
1224 enum ocfs2_ref_rec_contig contig =
1225 ocfs2_refcount_rec_contig(rb, index);
1226
1227 if (contig == REF_CONTIG_NONE)
1228 return;
1229
1230 if (contig == REF_CONTIG_LEFT || contig == REF_CONTIG_LEFTRIGHT) {
1231 BUG_ON(index == 0);
1232 index--;
1233 }
1234
1235 ocfs2_rotate_refcount_rec_left(rb, index);
1236
1237 if (contig == REF_CONTIG_LEFTRIGHT)
1238 ocfs2_rotate_refcount_rec_left(rb, index);
1239}
1240
Tao Ma1823cb02009-08-18 11:24:49 +08001241/*
1242 * Change the refcount indexed by "index" in ref_bh.
1243 * If refcount reaches 0, remove it.
1244 */
Tao Mae73a8192009-08-11 14:33:14 +08001245static int ocfs2_change_refcount_rec(handle_t *handle,
1246 struct ocfs2_caching_info *ci,
1247 struct buffer_head *ref_leaf_bh,
Tao Ma7540c1a2009-08-18 11:44:03 +08001248 int index, int merge, int change)
Tao Mae73a8192009-08-11 14:33:14 +08001249{
1250 int ret;
1251 struct ocfs2_refcount_block *rb =
1252 (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
Tao Ma1823cb02009-08-18 11:24:49 +08001253 struct ocfs2_refcount_list *rl = &rb->rf_records;
1254 struct ocfs2_refcount_rec *rec = &rl->rl_recs[index];
Tao Mae73a8192009-08-11 14:33:14 +08001255
1256 ret = ocfs2_journal_access_rb(handle, ci, ref_leaf_bh,
1257 OCFS2_JOURNAL_ACCESS_WRITE);
1258 if (ret) {
1259 mlog_errno(ret);
1260 goto out;
1261 }
1262
Tao Ma198aac22011-02-22 08:20:04 +08001263 trace_ocfs2_change_refcount_rec(
1264 (unsigned long long)ocfs2_metadata_cache_owner(ci),
1265 index, le32_to_cpu(rec->r_refcount), change);
Tao Mae73a8192009-08-11 14:33:14 +08001266 le32_add_cpu(&rec->r_refcount, change);
1267
Tao Ma1823cb02009-08-18 11:24:49 +08001268 if (!rec->r_refcount) {
1269 if (index != le16_to_cpu(rl->rl_used) - 1) {
1270 memmove(rec, rec + 1,
1271 (le16_to_cpu(rl->rl_used) - index - 1) *
1272 sizeof(struct ocfs2_refcount_rec));
1273 memset(&rl->rl_recs[le16_to_cpu(rl->rl_used) - 1],
1274 0, sizeof(struct ocfs2_refcount_rec));
1275 }
1276
1277 le16_add_cpu(&rl->rl_used, -1);
Tao Ma7540c1a2009-08-18 11:44:03 +08001278 } else if (merge)
Tao Ma1823cb02009-08-18 11:24:49 +08001279 ocfs2_refcount_rec_merge(rb, index);
Tao Mae73a8192009-08-11 14:33:14 +08001280
Joel Beckerec20cec2010-03-19 14:13:52 -07001281 ocfs2_journal_dirty(handle, ref_leaf_bh);
Tao Mae73a8192009-08-11 14:33:14 +08001282out:
1283 return ret;
1284}
1285
1286static int ocfs2_expand_inline_ref_root(handle_t *handle,
1287 struct ocfs2_caching_info *ci,
1288 struct buffer_head *ref_root_bh,
1289 struct buffer_head **ref_leaf_bh,
1290 struct ocfs2_alloc_context *meta_ac)
1291{
1292 int ret;
1293 u16 suballoc_bit_start;
1294 u32 num_got;
Joel Becker2b6cb572010-03-26 10:09:15 +08001295 u64 suballoc_loc, blkno;
Tao Mae73a8192009-08-11 14:33:14 +08001296 struct super_block *sb = ocfs2_metadata_cache_get_super(ci);
1297 struct buffer_head *new_bh = NULL;
1298 struct ocfs2_refcount_block *new_rb;
1299 struct ocfs2_refcount_block *root_rb =
1300 (struct ocfs2_refcount_block *)ref_root_bh->b_data;
1301
1302 ret = ocfs2_journal_access_rb(handle, ci, ref_root_bh,
1303 OCFS2_JOURNAL_ACCESS_WRITE);
1304 if (ret) {
1305 mlog_errno(ret);
1306 goto out;
1307 }
1308
Joel Becker2b6cb572010-03-26 10:09:15 +08001309 ret = ocfs2_claim_metadata(handle, meta_ac, 1, &suballoc_loc,
Tao Mae73a8192009-08-11 14:33:14 +08001310 &suballoc_bit_start, &num_got,
1311 &blkno);
1312 if (ret) {
1313 mlog_errno(ret);
1314 goto out;
1315 }
1316
1317 new_bh = sb_getblk(sb, blkno);
1318 if (new_bh == NULL) {
Rui Xiang7391a292013-11-12 15:06:54 -08001319 ret = -ENOMEM;
Tao Mae73a8192009-08-11 14:33:14 +08001320 mlog_errno(ret);
1321 goto out;
1322 }
1323 ocfs2_set_new_buffer_uptodate(ci, new_bh);
1324
1325 ret = ocfs2_journal_access_rb(handle, ci, new_bh,
1326 OCFS2_JOURNAL_ACCESS_CREATE);
1327 if (ret) {
1328 mlog_errno(ret);
1329 goto out;
1330 }
1331
1332 /*
1333 * Initialize ocfs2_refcount_block.
1334 * It should contain the same information as the old root.
1335 * so just memcpy it and change the corresponding field.
1336 */
1337 memcpy(new_bh->b_data, ref_root_bh->b_data, sb->s_blocksize);
1338
1339 new_rb = (struct ocfs2_refcount_block *)new_bh->b_data;
Tiger Yangb89c5422010-01-25 14:11:06 +08001340 new_rb->rf_suballoc_slot = cpu_to_le16(meta_ac->ac_alloc_slot);
Joel Becker2b6cb572010-03-26 10:09:15 +08001341 new_rb->rf_suballoc_loc = cpu_to_le64(suballoc_loc);
Tao Mae73a8192009-08-11 14:33:14 +08001342 new_rb->rf_suballoc_bit = cpu_to_le16(suballoc_bit_start);
1343 new_rb->rf_blkno = cpu_to_le64(blkno);
1344 new_rb->rf_cpos = cpu_to_le32(0);
1345 new_rb->rf_parent = cpu_to_le64(ref_root_bh->b_blocknr);
1346 new_rb->rf_flags = cpu_to_le32(OCFS2_REFCOUNT_LEAF_FL);
1347 ocfs2_journal_dirty(handle, new_bh);
1348
1349 /* Now change the root. */
1350 memset(&root_rb->rf_list, 0, sb->s_blocksize -
1351 offsetof(struct ocfs2_refcount_block, rf_list));
1352 root_rb->rf_list.l_count = cpu_to_le16(ocfs2_extent_recs_per_rb(sb));
1353 root_rb->rf_clusters = cpu_to_le32(1);
1354 root_rb->rf_list.l_next_free_rec = cpu_to_le16(1);
1355 root_rb->rf_list.l_recs[0].e_blkno = cpu_to_le64(blkno);
1356 root_rb->rf_list.l_recs[0].e_leaf_clusters = cpu_to_le16(1);
1357 root_rb->rf_flags = cpu_to_le32(OCFS2_REFCOUNT_TREE_FL);
1358
1359 ocfs2_journal_dirty(handle, ref_root_bh);
1360
Tao Ma198aac22011-02-22 08:20:04 +08001361 trace_ocfs2_expand_inline_ref_root((unsigned long long)blkno,
1362 le16_to_cpu(new_rb->rf_records.rl_used));
Tao Mae73a8192009-08-11 14:33:14 +08001363
1364 *ref_leaf_bh = new_bh;
1365 new_bh = NULL;
1366out:
1367 brelse(new_bh);
1368 return ret;
1369}
1370
1371static int ocfs2_refcount_rec_no_intersect(struct ocfs2_refcount_rec *prev,
1372 struct ocfs2_refcount_rec *next)
1373{
1374 if (ocfs2_get_ref_rec_low_cpos(prev) + le32_to_cpu(prev->r_clusters) <=
1375 ocfs2_get_ref_rec_low_cpos(next))
1376 return 1;
1377
1378 return 0;
1379}
1380
1381static int cmp_refcount_rec_by_low_cpos(const void *a, const void *b)
1382{
1383 const struct ocfs2_refcount_rec *l = a, *r = b;
1384 u32 l_cpos = ocfs2_get_ref_rec_low_cpos(l);
1385 u32 r_cpos = ocfs2_get_ref_rec_low_cpos(r);
1386
1387 if (l_cpos > r_cpos)
1388 return 1;
1389 if (l_cpos < r_cpos)
1390 return -1;
1391 return 0;
1392}
1393
1394static int cmp_refcount_rec_by_cpos(const void *a, const void *b)
1395{
1396 const struct ocfs2_refcount_rec *l = a, *r = b;
1397 u64 l_cpos = le64_to_cpu(l->r_cpos);
1398 u64 r_cpos = le64_to_cpu(r->r_cpos);
1399
1400 if (l_cpos > r_cpos)
1401 return 1;
1402 if (l_cpos < r_cpos)
1403 return -1;
1404 return 0;
1405}
1406
1407static void swap_refcount_rec(void *a, void *b, int size)
1408{
Fabian Fredericka6125432015-06-24 16:55:29 -07001409 struct ocfs2_refcount_rec *l = a, *r = b;
Tao Mae73a8192009-08-11 14:33:14 +08001410
Fabian Fredericka6125432015-06-24 16:55:29 -07001411 swap(*l, *r);
Tao Mae73a8192009-08-11 14:33:14 +08001412}
1413
1414/*
1415 * The refcount cpos are ordered by their 64bit cpos,
1416 * But we will use the low 32 bit to be the e_cpos in the b-tree.
1417 * So we need to make sure that this pos isn't intersected with others.
1418 *
1419 * Note: The refcount block is already sorted by their low 32 bit cpos,
1420 * So just try the middle pos first, and we will exit when we find
1421 * the good position.
1422 */
1423static int ocfs2_find_refcount_split_pos(struct ocfs2_refcount_list *rl,
1424 u32 *split_pos, int *split_index)
1425{
1426 int num_used = le16_to_cpu(rl->rl_used);
1427 int delta, middle = num_used / 2;
1428
1429 for (delta = 0; delta < middle; delta++) {
1430 /* Let's check delta earlier than middle */
1431 if (ocfs2_refcount_rec_no_intersect(
1432 &rl->rl_recs[middle - delta - 1],
1433 &rl->rl_recs[middle - delta])) {
1434 *split_index = middle - delta;
1435 break;
1436 }
1437
1438 /* For even counts, don't walk off the end */
1439 if ((middle + delta + 1) == num_used)
1440 continue;
1441
1442 /* Now try delta past middle */
1443 if (ocfs2_refcount_rec_no_intersect(
1444 &rl->rl_recs[middle + delta],
1445 &rl->rl_recs[middle + delta + 1])) {
1446 *split_index = middle + delta + 1;
1447 break;
1448 }
1449 }
1450
1451 if (delta >= middle)
1452 return -ENOSPC;
1453
1454 *split_pos = ocfs2_get_ref_rec_low_cpos(&rl->rl_recs[*split_index]);
1455 return 0;
1456}
1457
1458static int ocfs2_divide_leaf_refcount_block(struct buffer_head *ref_leaf_bh,
1459 struct buffer_head *new_bh,
1460 u32 *split_cpos)
1461{
1462 int split_index = 0, num_moved, ret;
1463 u32 cpos = 0;
1464 struct ocfs2_refcount_block *rb =
1465 (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
1466 struct ocfs2_refcount_list *rl = &rb->rf_records;
1467 struct ocfs2_refcount_block *new_rb =
1468 (struct ocfs2_refcount_block *)new_bh->b_data;
1469 struct ocfs2_refcount_list *new_rl = &new_rb->rf_records;
1470
Tao Ma198aac22011-02-22 08:20:04 +08001471 trace_ocfs2_divide_leaf_refcount_block(
1472 (unsigned long long)ref_leaf_bh->b_blocknr,
Al Viro28748b32012-04-13 12:28:21 -04001473 le16_to_cpu(rl->rl_count), le16_to_cpu(rl->rl_used));
Tao Mae73a8192009-08-11 14:33:14 +08001474
1475 /*
1476 * XXX: Improvement later.
1477 * If we know all the high 32 bit cpos is the same, no need to sort.
1478 *
1479 * In order to make the whole process safe, we do:
1480 * 1. sort the entries by their low 32 bit cpos first so that we can
1481 * find the split cpos easily.
1482 * 2. call ocfs2_insert_extent to insert the new refcount block.
1483 * 3. move the refcount rec to the new block.
1484 * 4. sort the entries by their 64 bit cpos.
1485 * 5. dirty the new_rb and rb.
1486 */
1487 sort(&rl->rl_recs, le16_to_cpu(rl->rl_used),
1488 sizeof(struct ocfs2_refcount_rec),
1489 cmp_refcount_rec_by_low_cpos, swap_refcount_rec);
1490
1491 ret = ocfs2_find_refcount_split_pos(rl, &cpos, &split_index);
1492 if (ret) {
1493 mlog_errno(ret);
1494 return ret;
1495 }
1496
1497 new_rb->rf_cpos = cpu_to_le32(cpos);
1498
1499 /* move refcount records starting from split_index to the new block. */
1500 num_moved = le16_to_cpu(rl->rl_used) - split_index;
1501 memcpy(new_rl->rl_recs, &rl->rl_recs[split_index],
1502 num_moved * sizeof(struct ocfs2_refcount_rec));
1503
1504 /*ok, remove the entries we just moved over to the other block. */
1505 memset(&rl->rl_recs[split_index], 0,
1506 num_moved * sizeof(struct ocfs2_refcount_rec));
1507
1508 /* change old and new rl_used accordingly. */
1509 le16_add_cpu(&rl->rl_used, -num_moved);
Tao Ma12d4cec2009-11-30 15:08:40 +08001510 new_rl->rl_used = cpu_to_le16(num_moved);
Tao Mae73a8192009-08-11 14:33:14 +08001511
1512 sort(&rl->rl_recs, le16_to_cpu(rl->rl_used),
1513 sizeof(struct ocfs2_refcount_rec),
1514 cmp_refcount_rec_by_cpos, swap_refcount_rec);
1515
1516 sort(&new_rl->rl_recs, le16_to_cpu(new_rl->rl_used),
1517 sizeof(struct ocfs2_refcount_rec),
1518 cmp_refcount_rec_by_cpos, swap_refcount_rec);
1519
1520 *split_cpos = cpos;
1521 return 0;
1522}
1523
1524static int ocfs2_new_leaf_refcount_block(handle_t *handle,
1525 struct ocfs2_caching_info *ci,
1526 struct buffer_head *ref_root_bh,
1527 struct buffer_head *ref_leaf_bh,
1528 struct ocfs2_alloc_context *meta_ac)
1529{
1530 int ret;
1531 u16 suballoc_bit_start;
1532 u32 num_got, new_cpos;
Joel Becker2b6cb572010-03-26 10:09:15 +08001533 u64 suballoc_loc, blkno;
Tao Mae73a8192009-08-11 14:33:14 +08001534 struct super_block *sb = ocfs2_metadata_cache_get_super(ci);
1535 struct ocfs2_refcount_block *root_rb =
1536 (struct ocfs2_refcount_block *)ref_root_bh->b_data;
1537 struct buffer_head *new_bh = NULL;
1538 struct ocfs2_refcount_block *new_rb;
1539 struct ocfs2_extent_tree ref_et;
1540
1541 BUG_ON(!(le32_to_cpu(root_rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL));
1542
1543 ret = ocfs2_journal_access_rb(handle, ci, ref_root_bh,
1544 OCFS2_JOURNAL_ACCESS_WRITE);
1545 if (ret) {
1546 mlog_errno(ret);
1547 goto out;
1548 }
1549
1550 ret = ocfs2_journal_access_rb(handle, ci, ref_leaf_bh,
1551 OCFS2_JOURNAL_ACCESS_WRITE);
1552 if (ret) {
1553 mlog_errno(ret);
1554 goto out;
1555 }
1556
Joel Becker2b6cb572010-03-26 10:09:15 +08001557 ret = ocfs2_claim_metadata(handle, meta_ac, 1, &suballoc_loc,
Tao Mae73a8192009-08-11 14:33:14 +08001558 &suballoc_bit_start, &num_got,
1559 &blkno);
1560 if (ret) {
1561 mlog_errno(ret);
1562 goto out;
1563 }
1564
1565 new_bh = sb_getblk(sb, blkno);
1566 if (new_bh == NULL) {
Rui Xiang7391a292013-11-12 15:06:54 -08001567 ret = -ENOMEM;
Tao Mae73a8192009-08-11 14:33:14 +08001568 mlog_errno(ret);
1569 goto out;
1570 }
1571 ocfs2_set_new_buffer_uptodate(ci, new_bh);
1572
1573 ret = ocfs2_journal_access_rb(handle, ci, new_bh,
1574 OCFS2_JOURNAL_ACCESS_CREATE);
1575 if (ret) {
1576 mlog_errno(ret);
1577 goto out;
1578 }
1579
1580 /* Initialize ocfs2_refcount_block. */
1581 new_rb = (struct ocfs2_refcount_block *)new_bh->b_data;
1582 memset(new_rb, 0, sb->s_blocksize);
1583 strcpy((void *)new_rb, OCFS2_REFCOUNT_BLOCK_SIGNATURE);
Tiger Yangb89c5422010-01-25 14:11:06 +08001584 new_rb->rf_suballoc_slot = cpu_to_le16(meta_ac->ac_alloc_slot);
Joel Becker2b6cb572010-03-26 10:09:15 +08001585 new_rb->rf_suballoc_loc = cpu_to_le64(suballoc_loc);
Tao Mae73a8192009-08-11 14:33:14 +08001586 new_rb->rf_suballoc_bit = cpu_to_le16(suballoc_bit_start);
1587 new_rb->rf_fs_generation = cpu_to_le32(OCFS2_SB(sb)->fs_generation);
1588 new_rb->rf_blkno = cpu_to_le64(blkno);
1589 new_rb->rf_parent = cpu_to_le64(ref_root_bh->b_blocknr);
1590 new_rb->rf_flags = cpu_to_le32(OCFS2_REFCOUNT_LEAF_FL);
1591 new_rb->rf_records.rl_count =
1592 cpu_to_le16(ocfs2_refcount_recs_per_rb(sb));
1593 new_rb->rf_generation = root_rb->rf_generation;
1594
1595 ret = ocfs2_divide_leaf_refcount_block(ref_leaf_bh, new_bh, &new_cpos);
1596 if (ret) {
1597 mlog_errno(ret);
1598 goto out;
1599 }
1600
1601 ocfs2_journal_dirty(handle, ref_leaf_bh);
1602 ocfs2_journal_dirty(handle, new_bh);
1603
1604 ocfs2_init_refcount_extent_tree(&ref_et, ci, ref_root_bh);
1605
Tao Ma198aac22011-02-22 08:20:04 +08001606 trace_ocfs2_new_leaf_refcount_block(
1607 (unsigned long long)new_bh->b_blocknr, new_cpos);
Tao Mae73a8192009-08-11 14:33:14 +08001608
1609 /* Insert the new leaf block with the specific offset cpos. */
1610 ret = ocfs2_insert_extent(handle, &ref_et, new_cpos, new_bh->b_blocknr,
1611 1, 0, meta_ac);
1612 if (ret)
1613 mlog_errno(ret);
1614
1615out:
1616 brelse(new_bh);
1617 return ret;
1618}
1619
1620static int ocfs2_expand_refcount_tree(handle_t *handle,
1621 struct ocfs2_caching_info *ci,
1622 struct buffer_head *ref_root_bh,
1623 struct buffer_head *ref_leaf_bh,
1624 struct ocfs2_alloc_context *meta_ac)
1625{
1626 int ret;
1627 struct buffer_head *expand_bh = NULL;
1628
1629 if (ref_root_bh == ref_leaf_bh) {
1630 /*
1631 * the old root bh hasn't been expanded to a b-tree,
1632 * so expand it first.
1633 */
1634 ret = ocfs2_expand_inline_ref_root(handle, ci, ref_root_bh,
1635 &expand_bh, meta_ac);
1636 if (ret) {
1637 mlog_errno(ret);
1638 goto out;
1639 }
1640 } else {
1641 expand_bh = ref_leaf_bh;
1642 get_bh(expand_bh);
1643 }
1644
1645
1646 /* Now add a new refcount block into the tree.*/
1647 ret = ocfs2_new_leaf_refcount_block(handle, ci, ref_root_bh,
1648 expand_bh, meta_ac);
1649 if (ret)
1650 mlog_errno(ret);
1651out:
1652 brelse(expand_bh);
1653 return ret;
1654}
1655
1656/*
1657 * Adjust the extent rec in b-tree representing ref_leaf_bh.
1658 *
1659 * Only called when we have inserted a new refcount rec at index 0
1660 * which means ocfs2_extent_rec.e_cpos may need some change.
1661 */
1662static int ocfs2_adjust_refcount_rec(handle_t *handle,
1663 struct ocfs2_caching_info *ci,
1664 struct buffer_head *ref_root_bh,
1665 struct buffer_head *ref_leaf_bh,
1666 struct ocfs2_refcount_rec *rec)
1667{
1668 int ret = 0, i;
1669 u32 new_cpos, old_cpos;
1670 struct ocfs2_path *path = NULL;
1671 struct ocfs2_extent_tree et;
1672 struct ocfs2_refcount_block *rb =
1673 (struct ocfs2_refcount_block *)ref_root_bh->b_data;
1674 struct ocfs2_extent_list *el;
1675
1676 if (!(le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL))
1677 goto out;
1678
1679 rb = (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
1680 old_cpos = le32_to_cpu(rb->rf_cpos);
1681 new_cpos = le64_to_cpu(rec->r_cpos) & OCFS2_32BIT_POS_MASK;
1682 if (old_cpos <= new_cpos)
1683 goto out;
1684
1685 ocfs2_init_refcount_extent_tree(&et, ci, ref_root_bh);
1686
1687 path = ocfs2_new_path_from_et(&et);
1688 if (!path) {
1689 ret = -ENOMEM;
1690 mlog_errno(ret);
1691 goto out;
1692 }
1693
1694 ret = ocfs2_find_path(ci, path, old_cpos);
1695 if (ret) {
1696 mlog_errno(ret);
1697 goto out;
1698 }
1699
1700 /*
1701 * 2 more credits, one for the leaf refcount block, one for
1702 * the extent block contains the extent rec.
1703 */
Tao Mac901fb02010-04-26 14:34:57 +08001704 ret = ocfs2_extend_trans(handle, 2);
Tao Mae73a8192009-08-11 14:33:14 +08001705 if (ret < 0) {
1706 mlog_errno(ret);
1707 goto out;
1708 }
1709
1710 ret = ocfs2_journal_access_rb(handle, ci, ref_leaf_bh,
1711 OCFS2_JOURNAL_ACCESS_WRITE);
1712 if (ret < 0) {
1713 mlog_errno(ret);
1714 goto out;
1715 }
1716
1717 ret = ocfs2_journal_access_eb(handle, ci, path_leaf_bh(path),
1718 OCFS2_JOURNAL_ACCESS_WRITE);
1719 if (ret < 0) {
1720 mlog_errno(ret);
1721 goto out;
1722 }
1723
1724 /* change the leaf extent block first. */
1725 el = path_leaf_el(path);
1726
1727 for (i = 0; i < le16_to_cpu(el->l_next_free_rec); i++)
1728 if (le32_to_cpu(el->l_recs[i].e_cpos) == old_cpos)
1729 break;
1730
1731 BUG_ON(i == le16_to_cpu(el->l_next_free_rec));
1732
1733 el->l_recs[i].e_cpos = cpu_to_le32(new_cpos);
1734
1735 /* change the r_cpos in the leaf block. */
1736 rb->rf_cpos = cpu_to_le32(new_cpos);
1737
1738 ocfs2_journal_dirty(handle, path_leaf_bh(path));
1739 ocfs2_journal_dirty(handle, ref_leaf_bh);
1740
1741out:
1742 ocfs2_free_path(path);
1743 return ret;
1744}
1745
1746static int ocfs2_insert_refcount_rec(handle_t *handle,
1747 struct ocfs2_caching_info *ci,
1748 struct buffer_head *ref_root_bh,
1749 struct buffer_head *ref_leaf_bh,
1750 struct ocfs2_refcount_rec *rec,
Tao Ma7540c1a2009-08-18 11:44:03 +08001751 int index, int merge,
Tao Mae73a8192009-08-11 14:33:14 +08001752 struct ocfs2_alloc_context *meta_ac)
1753{
1754 int ret;
1755 struct ocfs2_refcount_block *rb =
1756 (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
1757 struct ocfs2_refcount_list *rf_list = &rb->rf_records;
1758 struct buffer_head *new_bh = NULL;
1759
1760 BUG_ON(le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL);
1761
1762 if (rf_list->rl_used == rf_list->rl_count) {
1763 u64 cpos = le64_to_cpu(rec->r_cpos);
1764 u32 len = le32_to_cpu(rec->r_clusters);
1765
1766 ret = ocfs2_expand_refcount_tree(handle, ci, ref_root_bh,
1767 ref_leaf_bh, meta_ac);
1768 if (ret) {
1769 mlog_errno(ret);
1770 goto out;
1771 }
1772
1773 ret = ocfs2_get_refcount_rec(ci, ref_root_bh,
1774 cpos, len, NULL, &index,
1775 &new_bh);
1776 if (ret) {
1777 mlog_errno(ret);
1778 goto out;
1779 }
1780
1781 ref_leaf_bh = new_bh;
1782 rb = (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
1783 rf_list = &rb->rf_records;
1784 }
1785
1786 ret = ocfs2_journal_access_rb(handle, ci, ref_leaf_bh,
1787 OCFS2_JOURNAL_ACCESS_WRITE);
1788 if (ret) {
1789 mlog_errno(ret);
1790 goto out;
1791 }
1792
1793 if (index < le16_to_cpu(rf_list->rl_used))
1794 memmove(&rf_list->rl_recs[index + 1],
1795 &rf_list->rl_recs[index],
1796 (le16_to_cpu(rf_list->rl_used) - index) *
1797 sizeof(struct ocfs2_refcount_rec));
1798
Tao Ma198aac22011-02-22 08:20:04 +08001799 trace_ocfs2_insert_refcount_rec(
1800 (unsigned long long)ref_leaf_bh->b_blocknr, index,
1801 (unsigned long long)le64_to_cpu(rec->r_cpos),
1802 le32_to_cpu(rec->r_clusters), le32_to_cpu(rec->r_refcount));
Tao Mae73a8192009-08-11 14:33:14 +08001803
1804 rf_list->rl_recs[index] = *rec;
1805
1806 le16_add_cpu(&rf_list->rl_used, 1);
1807
Tao Ma7540c1a2009-08-18 11:44:03 +08001808 if (merge)
1809 ocfs2_refcount_rec_merge(rb, index);
Tao Mae73a8192009-08-11 14:33:14 +08001810
Joel Beckerec20cec2010-03-19 14:13:52 -07001811 ocfs2_journal_dirty(handle, ref_leaf_bh);
Tao Mae73a8192009-08-11 14:33:14 +08001812
1813 if (index == 0) {
1814 ret = ocfs2_adjust_refcount_rec(handle, ci,
1815 ref_root_bh,
1816 ref_leaf_bh, rec);
1817 if (ret)
1818 mlog_errno(ret);
1819 }
1820out:
1821 brelse(new_bh);
1822 return ret;
1823}
1824
1825/*
1826 * Split the refcount_rec indexed by "index" in ref_leaf_bh.
1827 * This is much simple than our b-tree code.
1828 * split_rec is the new refcount rec we want to insert.
1829 * If split_rec->r_refcount > 0, we are changing the refcount(in case we
1830 * increase refcount or decrease a refcount to non-zero).
1831 * If split_rec->r_refcount == 0, we are punching a hole in current refcount
1832 * rec( in case we decrease a refcount to zero).
1833 */
1834static int ocfs2_split_refcount_rec(handle_t *handle,
1835 struct ocfs2_caching_info *ci,
1836 struct buffer_head *ref_root_bh,
1837 struct buffer_head *ref_leaf_bh,
1838 struct ocfs2_refcount_rec *split_rec,
Tao Ma7540c1a2009-08-18 11:44:03 +08001839 int index, int merge,
Tao Mae73a8192009-08-11 14:33:14 +08001840 struct ocfs2_alloc_context *meta_ac,
1841 struct ocfs2_cached_dealloc_ctxt *dealloc)
1842{
1843 int ret, recs_need;
1844 u32 len;
1845 struct ocfs2_refcount_block *rb =
1846 (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
1847 struct ocfs2_refcount_list *rf_list = &rb->rf_records;
1848 struct ocfs2_refcount_rec *orig_rec = &rf_list->rl_recs[index];
1849 struct ocfs2_refcount_rec *tail_rec = NULL;
1850 struct buffer_head *new_bh = NULL;
1851
1852 BUG_ON(le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL);
1853
Tao Ma198aac22011-02-22 08:20:04 +08001854 trace_ocfs2_split_refcount_rec(le64_to_cpu(orig_rec->r_cpos),
1855 le32_to_cpu(orig_rec->r_clusters),
1856 le32_to_cpu(orig_rec->r_refcount),
1857 le64_to_cpu(split_rec->r_cpos),
1858 le32_to_cpu(split_rec->r_clusters),
1859 le32_to_cpu(split_rec->r_refcount));
Tao Mae73a8192009-08-11 14:33:14 +08001860
1861 /*
1862 * If we just need to split the header or tail clusters,
1863 * no more recs are needed, just split is OK.
1864 * Otherwise we at least need one new recs.
1865 */
1866 if (!split_rec->r_refcount &&
1867 (split_rec->r_cpos == orig_rec->r_cpos ||
1868 le64_to_cpu(split_rec->r_cpos) +
1869 le32_to_cpu(split_rec->r_clusters) ==
1870 le64_to_cpu(orig_rec->r_cpos) + le32_to_cpu(orig_rec->r_clusters)))
1871 recs_need = 0;
1872 else
1873 recs_need = 1;
1874
1875 /*
1876 * We need one more rec if we split in the middle and the new rec have
1877 * some refcount in it.
1878 */
1879 if (split_rec->r_refcount &&
1880 (split_rec->r_cpos != orig_rec->r_cpos &&
1881 le64_to_cpu(split_rec->r_cpos) +
1882 le32_to_cpu(split_rec->r_clusters) !=
1883 le64_to_cpu(orig_rec->r_cpos) + le32_to_cpu(orig_rec->r_clusters)))
1884 recs_need++;
1885
1886 /* If the leaf block don't have enough record, expand it. */
Tao Ma12d4cec2009-11-30 15:08:40 +08001887 if (le16_to_cpu(rf_list->rl_used) + recs_need >
1888 le16_to_cpu(rf_list->rl_count)) {
Tao Mae73a8192009-08-11 14:33:14 +08001889 struct ocfs2_refcount_rec tmp_rec;
1890 u64 cpos = le64_to_cpu(orig_rec->r_cpos);
1891 len = le32_to_cpu(orig_rec->r_clusters);
1892 ret = ocfs2_expand_refcount_tree(handle, ci, ref_root_bh,
1893 ref_leaf_bh, meta_ac);
1894 if (ret) {
1895 mlog_errno(ret);
1896 goto out;
1897 }
1898
1899 /*
1900 * We have to re-get it since now cpos may be moved to
1901 * another leaf block.
1902 */
1903 ret = ocfs2_get_refcount_rec(ci, ref_root_bh,
1904 cpos, len, &tmp_rec, &index,
1905 &new_bh);
1906 if (ret) {
1907 mlog_errno(ret);
1908 goto out;
1909 }
1910
1911 ref_leaf_bh = new_bh;
1912 rb = (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
1913 rf_list = &rb->rf_records;
1914 orig_rec = &rf_list->rl_recs[index];
1915 }
1916
1917 ret = ocfs2_journal_access_rb(handle, ci, ref_leaf_bh,
1918 OCFS2_JOURNAL_ACCESS_WRITE);
1919 if (ret) {
1920 mlog_errno(ret);
1921 goto out;
1922 }
1923
1924 /*
1925 * We have calculated out how many new records we need and store
1926 * in recs_need, so spare enough space first by moving the records
1927 * after "index" to the end.
1928 */
1929 if (index != le16_to_cpu(rf_list->rl_used) - 1)
1930 memmove(&rf_list->rl_recs[index + 1 + recs_need],
1931 &rf_list->rl_recs[index + 1],
1932 (le16_to_cpu(rf_list->rl_used) - index - 1) *
1933 sizeof(struct ocfs2_refcount_rec));
1934
1935 len = (le64_to_cpu(orig_rec->r_cpos) +
1936 le32_to_cpu(orig_rec->r_clusters)) -
1937 (le64_to_cpu(split_rec->r_cpos) +
1938 le32_to_cpu(split_rec->r_clusters));
1939
1940 /*
1941 * If we have "len", the we will split in the tail and move it
1942 * to the end of the space we have just spared.
1943 */
1944 if (len) {
1945 tail_rec = &rf_list->rl_recs[index + recs_need];
1946
1947 memcpy(tail_rec, orig_rec, sizeof(struct ocfs2_refcount_rec));
1948 le64_add_cpu(&tail_rec->r_cpos,
1949 le32_to_cpu(tail_rec->r_clusters) - len);
Tao Ma12d4cec2009-11-30 15:08:40 +08001950 tail_rec->r_clusters = cpu_to_le32(len);
Tao Mae73a8192009-08-11 14:33:14 +08001951 }
1952
1953 /*
1954 * If the split pos isn't the same as the original one, we need to
1955 * split in the head.
1956 *
1957 * Note: We have the chance that split_rec.r_refcount = 0,
1958 * recs_need = 0 and len > 0, which means we just cut the head from
1959 * the orig_rec and in that case we have done some modification in
1960 * orig_rec above, so the check for r_cpos is faked.
1961 */
1962 if (split_rec->r_cpos != orig_rec->r_cpos && tail_rec != orig_rec) {
1963 len = le64_to_cpu(split_rec->r_cpos) -
1964 le64_to_cpu(orig_rec->r_cpos);
1965 orig_rec->r_clusters = cpu_to_le32(len);
1966 index++;
1967 }
1968
1969 le16_add_cpu(&rf_list->rl_used, recs_need);
1970
1971 if (split_rec->r_refcount) {
1972 rf_list->rl_recs[index] = *split_rec;
Tao Ma198aac22011-02-22 08:20:04 +08001973 trace_ocfs2_split_refcount_rec_insert(
1974 (unsigned long long)ref_leaf_bh->b_blocknr, index,
1975 (unsigned long long)le64_to_cpu(split_rec->r_cpos),
1976 le32_to_cpu(split_rec->r_clusters),
1977 le32_to_cpu(split_rec->r_refcount));
Tao Mae73a8192009-08-11 14:33:14 +08001978
Tao Ma7540c1a2009-08-18 11:44:03 +08001979 if (merge)
1980 ocfs2_refcount_rec_merge(rb, index);
Tao Mae73a8192009-08-11 14:33:14 +08001981 }
1982
Joel Beckerec20cec2010-03-19 14:13:52 -07001983 ocfs2_journal_dirty(handle, ref_leaf_bh);
Tao Mae73a8192009-08-11 14:33:14 +08001984
1985out:
1986 brelse(new_bh);
1987 return ret;
1988}
1989
Tao Ma7540c1a2009-08-18 11:44:03 +08001990static int __ocfs2_increase_refcount(handle_t *handle,
1991 struct ocfs2_caching_info *ci,
1992 struct buffer_head *ref_root_bh,
1993 u64 cpos, u32 len, int merge,
1994 struct ocfs2_alloc_context *meta_ac,
1995 struct ocfs2_cached_dealloc_ctxt *dealloc)
Tao Mae73a8192009-08-11 14:33:14 +08001996{
1997 int ret = 0, index;
1998 struct buffer_head *ref_leaf_bh = NULL;
1999 struct ocfs2_refcount_rec rec;
2000 unsigned int set_len = 0;
2001
Tao Ma198aac22011-02-22 08:20:04 +08002002 trace_ocfs2_increase_refcount_begin(
Tao Mae73a8192009-08-11 14:33:14 +08002003 (unsigned long long)ocfs2_metadata_cache_owner(ci),
2004 (unsigned long long)cpos, len);
2005
2006 while (len) {
2007 ret = ocfs2_get_refcount_rec(ci, ref_root_bh,
2008 cpos, len, &rec, &index,
2009 &ref_leaf_bh);
2010 if (ret) {
2011 mlog_errno(ret);
2012 goto out;
2013 }
2014
2015 set_len = le32_to_cpu(rec.r_clusters);
2016
2017 /*
2018 * Here we may meet with 3 situations:
2019 *
2020 * 1. If we find an already existing record, and the length
2021 * is the same, cool, we just need to increase the r_refcount
2022 * and it is OK.
2023 * 2. If we find a hole, just insert it with r_refcount = 1.
2024 * 3. If we are in the middle of one extent record, split
2025 * it.
2026 */
2027 if (rec.r_refcount && le64_to_cpu(rec.r_cpos) == cpos &&
2028 set_len <= len) {
Tao Ma198aac22011-02-22 08:20:04 +08002029 trace_ocfs2_increase_refcount_change(
2030 (unsigned long long)cpos, set_len,
2031 le32_to_cpu(rec.r_refcount));
Tao Mae73a8192009-08-11 14:33:14 +08002032 ret = ocfs2_change_refcount_rec(handle, ci,
Tao Ma7540c1a2009-08-18 11:44:03 +08002033 ref_leaf_bh, index,
2034 merge, 1);
Tao Mae73a8192009-08-11 14:33:14 +08002035 if (ret) {
2036 mlog_errno(ret);
2037 goto out;
2038 }
2039 } else if (!rec.r_refcount) {
2040 rec.r_refcount = cpu_to_le32(1);
2041
Tao Ma198aac22011-02-22 08:20:04 +08002042 trace_ocfs2_increase_refcount_insert(
Tao Mae73a8192009-08-11 14:33:14 +08002043 (unsigned long long)le64_to_cpu(rec.r_cpos),
2044 set_len);
2045 ret = ocfs2_insert_refcount_rec(handle, ci, ref_root_bh,
2046 ref_leaf_bh,
Tao Ma7540c1a2009-08-18 11:44:03 +08002047 &rec, index,
2048 merge, meta_ac);
Tao Mae73a8192009-08-11 14:33:14 +08002049 if (ret) {
2050 mlog_errno(ret);
2051 goto out;
2052 }
2053 } else {
2054 set_len = min((u64)(cpos + len),
2055 le64_to_cpu(rec.r_cpos) + set_len) - cpos;
2056 rec.r_cpos = cpu_to_le64(cpos);
2057 rec.r_clusters = cpu_to_le32(set_len);
2058 le32_add_cpu(&rec.r_refcount, 1);
2059
Tao Ma198aac22011-02-22 08:20:04 +08002060 trace_ocfs2_increase_refcount_split(
Tao Mae73a8192009-08-11 14:33:14 +08002061 (unsigned long long)le64_to_cpu(rec.r_cpos),
2062 set_len, le32_to_cpu(rec.r_refcount));
2063 ret = ocfs2_split_refcount_rec(handle, ci,
2064 ref_root_bh, ref_leaf_bh,
Tao Ma7540c1a2009-08-18 11:44:03 +08002065 &rec, index, merge,
Tao Mae73a8192009-08-11 14:33:14 +08002066 meta_ac, dealloc);
2067 if (ret) {
2068 mlog_errno(ret);
2069 goto out;
2070 }
2071 }
2072
2073 cpos += set_len;
2074 len -= set_len;
2075 brelse(ref_leaf_bh);
2076 ref_leaf_bh = NULL;
2077 }
2078
2079out:
2080 brelse(ref_leaf_bh);
2081 return ret;
2082}
Tao Ma1823cb02009-08-18 11:24:49 +08002083
2084static int ocfs2_remove_refcount_extent(handle_t *handle,
2085 struct ocfs2_caching_info *ci,
2086 struct buffer_head *ref_root_bh,
2087 struct buffer_head *ref_leaf_bh,
2088 struct ocfs2_alloc_context *meta_ac,
2089 struct ocfs2_cached_dealloc_ctxt *dealloc)
2090{
2091 int ret;
2092 struct super_block *sb = ocfs2_metadata_cache_get_super(ci);
2093 struct ocfs2_refcount_block *rb =
2094 (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
2095 struct ocfs2_extent_tree et;
2096
2097 BUG_ON(rb->rf_records.rl_used);
2098
Tao Ma198aac22011-02-22 08:20:04 +08002099 trace_ocfs2_remove_refcount_extent(
2100 (unsigned long long)ocfs2_metadata_cache_owner(ci),
2101 (unsigned long long)ref_leaf_bh->b_blocknr,
2102 le32_to_cpu(rb->rf_cpos));
2103
Tao Ma1823cb02009-08-18 11:24:49 +08002104 ocfs2_init_refcount_extent_tree(&et, ci, ref_root_bh);
2105 ret = ocfs2_remove_extent(handle, &et, le32_to_cpu(rb->rf_cpos),
2106 1, meta_ac, dealloc);
2107 if (ret) {
2108 mlog_errno(ret);
2109 goto out;
2110 }
2111
2112 ocfs2_remove_from_cache(ci, ref_leaf_bh);
2113
2114 /*
2115 * add the freed block to the dealloc so that it will be freed
2116 * when we run dealloc.
2117 */
2118 ret = ocfs2_cache_block_dealloc(dealloc, EXTENT_ALLOC_SYSTEM_INODE,
2119 le16_to_cpu(rb->rf_suballoc_slot),
Tao Ma74380c42010-03-22 14:20:18 +08002120 le64_to_cpu(rb->rf_suballoc_loc),
Tao Ma1823cb02009-08-18 11:24:49 +08002121 le64_to_cpu(rb->rf_blkno),
2122 le16_to_cpu(rb->rf_suballoc_bit));
2123 if (ret) {
2124 mlog_errno(ret);
2125 goto out;
2126 }
2127
2128 ret = ocfs2_journal_access_rb(handle, ci, ref_root_bh,
2129 OCFS2_JOURNAL_ACCESS_WRITE);
2130 if (ret) {
2131 mlog_errno(ret);
2132 goto out;
2133 }
2134
2135 rb = (struct ocfs2_refcount_block *)ref_root_bh->b_data;
2136
2137 le32_add_cpu(&rb->rf_clusters, -1);
2138
2139 /*
2140 * check whether we need to restore the root refcount block if
2141 * there is no leaf extent block at atll.
2142 */
2143 if (!rb->rf_list.l_next_free_rec) {
2144 BUG_ON(rb->rf_clusters);
2145
Tao Ma198aac22011-02-22 08:20:04 +08002146 trace_ocfs2_restore_refcount_block(
Tao Ma1823cb02009-08-18 11:24:49 +08002147 (unsigned long long)ref_root_bh->b_blocknr);
2148
2149 rb->rf_flags = 0;
2150 rb->rf_parent = 0;
2151 rb->rf_cpos = 0;
2152 memset(&rb->rf_records, 0, sb->s_blocksize -
2153 offsetof(struct ocfs2_refcount_block, rf_records));
2154 rb->rf_records.rl_count =
2155 cpu_to_le16(ocfs2_refcount_recs_per_rb(sb));
2156 }
2157
2158 ocfs2_journal_dirty(handle, ref_root_bh);
2159
2160out:
2161 return ret;
2162}
2163
Tao Ma7540c1a2009-08-18 11:44:03 +08002164int ocfs2_increase_refcount(handle_t *handle,
2165 struct ocfs2_caching_info *ci,
2166 struct buffer_head *ref_root_bh,
2167 u64 cpos, u32 len,
2168 struct ocfs2_alloc_context *meta_ac,
2169 struct ocfs2_cached_dealloc_ctxt *dealloc)
2170{
2171 return __ocfs2_increase_refcount(handle, ci, ref_root_bh,
2172 cpos, len, 1,
2173 meta_ac, dealloc);
2174}
2175
Tao Ma1823cb02009-08-18 11:24:49 +08002176static int ocfs2_decrease_refcount_rec(handle_t *handle,
2177 struct ocfs2_caching_info *ci,
2178 struct buffer_head *ref_root_bh,
2179 struct buffer_head *ref_leaf_bh,
2180 int index, u64 cpos, unsigned int len,
2181 struct ocfs2_alloc_context *meta_ac,
2182 struct ocfs2_cached_dealloc_ctxt *dealloc)
2183{
2184 int ret;
2185 struct ocfs2_refcount_block *rb =
2186 (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
2187 struct ocfs2_refcount_rec *rec = &rb->rf_records.rl_recs[index];
2188
2189 BUG_ON(cpos < le64_to_cpu(rec->r_cpos));
2190 BUG_ON(cpos + len >
2191 le64_to_cpu(rec->r_cpos) + le32_to_cpu(rec->r_clusters));
2192
Tao Ma198aac22011-02-22 08:20:04 +08002193 trace_ocfs2_decrease_refcount_rec(
2194 (unsigned long long)ocfs2_metadata_cache_owner(ci),
2195 (unsigned long long)cpos, len);
2196
Tao Ma1823cb02009-08-18 11:24:49 +08002197 if (cpos == le64_to_cpu(rec->r_cpos) &&
2198 len == le32_to_cpu(rec->r_clusters))
2199 ret = ocfs2_change_refcount_rec(handle, ci,
Tao Ma7540c1a2009-08-18 11:44:03 +08002200 ref_leaf_bh, index, 1, -1);
Tao Ma1823cb02009-08-18 11:24:49 +08002201 else {
2202 struct ocfs2_refcount_rec split = *rec;
2203 split.r_cpos = cpu_to_le64(cpos);
2204 split.r_clusters = cpu_to_le32(len);
2205
2206 le32_add_cpu(&split.r_refcount, -1);
2207
Tao Ma1823cb02009-08-18 11:24:49 +08002208 ret = ocfs2_split_refcount_rec(handle, ci,
2209 ref_root_bh, ref_leaf_bh,
Tao Ma7540c1a2009-08-18 11:44:03 +08002210 &split, index, 1,
Tao Ma1823cb02009-08-18 11:24:49 +08002211 meta_ac, dealloc);
2212 }
2213
2214 if (ret) {
2215 mlog_errno(ret);
2216 goto out;
2217 }
2218
2219 /* Remove the leaf refcount block if it contains no refcount record. */
2220 if (!rb->rf_records.rl_used && ref_leaf_bh != ref_root_bh) {
2221 ret = ocfs2_remove_refcount_extent(handle, ci, ref_root_bh,
2222 ref_leaf_bh, meta_ac,
2223 dealloc);
2224 if (ret)
2225 mlog_errno(ret);
2226 }
2227
2228out:
2229 return ret;
2230}
2231
2232static int __ocfs2_decrease_refcount(handle_t *handle,
2233 struct ocfs2_caching_info *ci,
2234 struct buffer_head *ref_root_bh,
2235 u64 cpos, u32 len,
2236 struct ocfs2_alloc_context *meta_ac,
Tao Ma6ae23c52009-08-18 11:30:55 +08002237 struct ocfs2_cached_dealloc_ctxt *dealloc,
2238 int delete)
Tao Ma1823cb02009-08-18 11:24:49 +08002239{
2240 int ret = 0, index = 0;
2241 struct ocfs2_refcount_rec rec;
2242 unsigned int r_count = 0, r_len;
2243 struct super_block *sb = ocfs2_metadata_cache_get_super(ci);
2244 struct buffer_head *ref_leaf_bh = NULL;
2245
Tao Ma198aac22011-02-22 08:20:04 +08002246 trace_ocfs2_decrease_refcount(
2247 (unsigned long long)ocfs2_metadata_cache_owner(ci),
2248 (unsigned long long)cpos, len, delete);
Tao Ma1823cb02009-08-18 11:24:49 +08002249
2250 while (len) {
2251 ret = ocfs2_get_refcount_rec(ci, ref_root_bh,
2252 cpos, len, &rec, &index,
2253 &ref_leaf_bh);
2254 if (ret) {
2255 mlog_errno(ret);
2256 goto out;
2257 }
2258
2259 r_count = le32_to_cpu(rec.r_refcount);
2260 BUG_ON(r_count == 0);
Tao Ma6ae23c52009-08-18 11:30:55 +08002261 if (!delete)
2262 BUG_ON(r_count > 1);
Tao Ma1823cb02009-08-18 11:24:49 +08002263
2264 r_len = min((u64)(cpos + len), le64_to_cpu(rec.r_cpos) +
2265 le32_to_cpu(rec.r_clusters)) - cpos;
2266
2267 ret = ocfs2_decrease_refcount_rec(handle, ci, ref_root_bh,
2268 ref_leaf_bh, index,
2269 cpos, r_len,
2270 meta_ac, dealloc);
2271 if (ret) {
2272 mlog_errno(ret);
2273 goto out;
2274 }
2275
Tao Ma6ae23c52009-08-18 11:30:55 +08002276 if (le32_to_cpu(rec.r_refcount) == 1 && delete) {
Tao Ma1823cb02009-08-18 11:24:49 +08002277 ret = ocfs2_cache_cluster_dealloc(dealloc,
2278 ocfs2_clusters_to_blocks(sb, cpos),
2279 r_len);
2280 if (ret) {
2281 mlog_errno(ret);
2282 goto out;
2283 }
2284 }
2285
2286 cpos += r_len;
2287 len -= r_len;
2288 brelse(ref_leaf_bh);
2289 ref_leaf_bh = NULL;
2290 }
2291
2292out:
2293 brelse(ref_leaf_bh);
2294 return ret;
2295}
2296
2297/* Caller must hold refcount tree lock. */
2298int ocfs2_decrease_refcount(struct inode *inode,
2299 handle_t *handle, u32 cpos, u32 len,
2300 struct ocfs2_alloc_context *meta_ac,
Tao Ma6ae23c52009-08-18 11:30:55 +08002301 struct ocfs2_cached_dealloc_ctxt *dealloc,
2302 int delete)
Tao Ma1823cb02009-08-18 11:24:49 +08002303{
2304 int ret;
2305 u64 ref_blkno;
2306 struct ocfs2_inode_info *oi = OCFS2_I(inode);
2307 struct buffer_head *ref_root_bh = NULL;
2308 struct ocfs2_refcount_tree *tree;
2309
2310 BUG_ON(!(oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL));
2311
2312 ret = ocfs2_get_refcount_block(inode, &ref_blkno);
2313 if (ret) {
2314 mlog_errno(ret);
2315 goto out;
2316 }
2317
2318 ret = ocfs2_get_refcount_tree(OCFS2_SB(inode->i_sb), ref_blkno, &tree);
2319 if (ret) {
2320 mlog_errno(ret);
2321 goto out;
2322 }
2323
2324 ret = ocfs2_read_refcount_block(&tree->rf_ci, tree->rf_blkno,
2325 &ref_root_bh);
2326 if (ret) {
2327 mlog_errno(ret);
2328 goto out;
2329 }
2330
2331 ret = __ocfs2_decrease_refcount(handle, &tree->rf_ci, ref_root_bh,
Tao Ma6ae23c52009-08-18 11:30:55 +08002332 cpos, len, meta_ac, dealloc, delete);
Tao Ma1823cb02009-08-18 11:24:49 +08002333 if (ret)
2334 mlog_errno(ret);
2335out:
2336 brelse(ref_root_bh);
2337 return ret;
2338}
Tao Ma1aa75fe2009-08-18 11:28:39 +08002339
2340/*
2341 * Mark the already-existing extent at cpos as refcounted for len clusters.
2342 * This adds the refcount extent flag.
2343 *
2344 * If the existing extent is larger than the request, initiate a
2345 * split. An attempt will be made at merging with adjacent extents.
2346 *
2347 * The caller is responsible for passing down meta_ac if we'll need it.
2348 */
2349static int ocfs2_mark_extent_refcounted(struct inode *inode,
2350 struct ocfs2_extent_tree *et,
2351 handle_t *handle, u32 cpos,
2352 u32 len, u32 phys,
2353 struct ocfs2_alloc_context *meta_ac,
2354 struct ocfs2_cached_dealloc_ctxt *dealloc)
2355{
2356 int ret;
2357
Tao Ma198aac22011-02-22 08:20:04 +08002358 trace_ocfs2_mark_extent_refcounted(OCFS2_I(inode)->ip_blkno,
2359 cpos, len, phys);
Tao Ma1aa75fe2009-08-18 11:28:39 +08002360
2361 if (!ocfs2_refcount_tree(OCFS2_SB(inode->i_sb))) {
2362 ocfs2_error(inode->i_sb, "Inode %lu want to use refcount "
2363 "tree, but the feature bit is not set in the "
2364 "super block.", inode->i_ino);
2365 ret = -EROFS;
2366 goto out;
2367 }
2368
2369 ret = ocfs2_change_extent_flag(handle, et, cpos,
2370 len, phys, meta_ac, dealloc,
2371 OCFS2_EXT_REFCOUNTED, 0);
2372 if (ret)
2373 mlog_errno(ret);
2374
2375out:
2376 return ret;
2377}
Tao Mabcbbb242009-08-18 11:29:12 +08002378
2379/*
2380 * Given some contiguous physical clusters, calculate what we need
2381 * for modifying their refcount.
2382 */
2383static int ocfs2_calc_refcount_meta_credits(struct super_block *sb,
2384 struct ocfs2_caching_info *ci,
2385 struct buffer_head *ref_root_bh,
2386 u64 start_cpos,
2387 u32 clusters,
2388 int *meta_add,
2389 int *credits)
2390{
2391 int ret = 0, index, ref_blocks = 0, recs_add = 0;
2392 u64 cpos = start_cpos;
2393 struct ocfs2_refcount_block *rb;
2394 struct ocfs2_refcount_rec rec;
2395 struct buffer_head *ref_leaf_bh = NULL, *prev_bh = NULL;
2396 u32 len;
2397
Tao Mabcbbb242009-08-18 11:29:12 +08002398 while (clusters) {
2399 ret = ocfs2_get_refcount_rec(ci, ref_root_bh,
2400 cpos, clusters, &rec,
2401 &index, &ref_leaf_bh);
2402 if (ret) {
2403 mlog_errno(ret);
2404 goto out;
2405 }
2406
2407 if (ref_leaf_bh != prev_bh) {
2408 /*
2409 * Now we encounter a new leaf block, so calculate
2410 * whether we need to extend the old leaf.
2411 */
2412 if (prev_bh) {
2413 rb = (struct ocfs2_refcount_block *)
2414 prev_bh->b_data;
2415
Al Viroe1bf4cc2012-04-13 12:27:11 -04002416 if (le16_to_cpu(rb->rf_records.rl_used) +
Tao Mabcbbb242009-08-18 11:29:12 +08002417 recs_add >
2418 le16_to_cpu(rb->rf_records.rl_count))
2419 ref_blocks++;
2420 }
2421
2422 recs_add = 0;
2423 *credits += 1;
2424 brelse(prev_bh);
2425 prev_bh = ref_leaf_bh;
2426 get_bh(prev_bh);
2427 }
2428
Tao Ma198aac22011-02-22 08:20:04 +08002429 trace_ocfs2_calc_refcount_meta_credits_iterate(
2430 recs_add, (unsigned long long)cpos, clusters,
2431 (unsigned long long)le64_to_cpu(rec.r_cpos),
2432 le32_to_cpu(rec.r_clusters),
2433 le32_to_cpu(rec.r_refcount), index);
Tao Mabcbbb242009-08-18 11:29:12 +08002434
2435 len = min((u64)cpos + clusters, le64_to_cpu(rec.r_cpos) +
2436 le32_to_cpu(rec.r_clusters)) - cpos;
2437 /*
Tao Mabcbbb242009-08-18 11:29:12 +08002438 * We record all the records which will be inserted to the
2439 * same refcount block, so that we can tell exactly whether
2440 * we need a new refcount block or not.
Tao Ma8a2e70c2010-07-22 13:56:45 +08002441 *
2442 * If we will insert a new one, this is easy and only happens
2443 * during adding refcounted flag to the extent, so we don't
2444 * have a chance of spliting. We just need one record.
2445 *
2446 * If the refcount rec already exists, that would be a little
2447 * complicated. we may have to:
2448 * 1) split at the beginning if the start pos isn't aligned.
2449 * we need 1 more record in this case.
2450 * 2) split int the end if the end pos isn't aligned.
2451 * we need 1 more record in this case.
2452 * 3) split in the middle because of file system fragmentation.
2453 * we need 2 more records in this case(we can't detect this
2454 * beforehand, so always think of the worst case).
Tao Mabcbbb242009-08-18 11:29:12 +08002455 */
2456 if (rec.r_refcount) {
Tao Ma8a2e70c2010-07-22 13:56:45 +08002457 recs_add += 2;
Tao Mabcbbb242009-08-18 11:29:12 +08002458 /* Check whether we need a split at the beginning. */
2459 if (cpos == start_cpos &&
2460 cpos != le64_to_cpu(rec.r_cpos))
2461 recs_add++;
2462
2463 /* Check whether we need a split in the end. */
2464 if (cpos + clusters < le64_to_cpu(rec.r_cpos) +
2465 le32_to_cpu(rec.r_clusters))
2466 recs_add++;
2467 } else
2468 recs_add++;
2469
2470 brelse(ref_leaf_bh);
2471 ref_leaf_bh = NULL;
2472 clusters -= len;
2473 cpos += len;
2474 }
2475
2476 if (prev_bh) {
2477 rb = (struct ocfs2_refcount_block *)prev_bh->b_data;
2478
Al Viroe1bf4cc2012-04-13 12:27:11 -04002479 if (le16_to_cpu(rb->rf_records.rl_used) + recs_add >
Tao Mabcbbb242009-08-18 11:29:12 +08002480 le16_to_cpu(rb->rf_records.rl_count))
2481 ref_blocks++;
2482
2483 *credits += 1;
2484 }
2485
2486 if (!ref_blocks)
2487 goto out;
2488
Tao Mabcbbb242009-08-18 11:29:12 +08002489 *meta_add += ref_blocks;
2490 *credits += ref_blocks;
2491
2492 /*
2493 * So we may need ref_blocks to insert into the tree.
2494 * That also means we need to change the b-tree and add that number
2495 * of records since we never merge them.
2496 * We need one more block for expansion since the new created leaf
2497 * block is also full and needs split.
2498 */
2499 rb = (struct ocfs2_refcount_block *)ref_root_bh->b_data;
2500 if (le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL) {
2501 struct ocfs2_extent_tree et;
2502
2503 ocfs2_init_refcount_extent_tree(&et, ci, ref_root_bh);
2504 *meta_add += ocfs2_extend_meta_needed(et.et_root_el);
2505 *credits += ocfs2_calc_extend_credits(sb,
Goldwyn Rodrigues06f9da62013-11-12 15:06:52 -08002506 et.et_root_el);
Tao Mabcbbb242009-08-18 11:29:12 +08002507 } else {
2508 *credits += OCFS2_EXPAND_REFCOUNT_TREE_CREDITS;
2509 *meta_add += 1;
2510 }
2511
2512out:
Tao Ma198aac22011-02-22 08:20:04 +08002513
2514 trace_ocfs2_calc_refcount_meta_credits(
2515 (unsigned long long)start_cpos, clusters,
2516 *meta_add, *credits);
Tao Mabcbbb242009-08-18 11:29:12 +08002517 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
André Goddard Rosaaf901ca2009-11-14 13:09:05 -02002528 * contiguous also, so that we can get the number easily.
Tristan Ye78f94672010-05-11 17:54:42 +08002529 * We will at most add split 2 refcount records and 2 more
2530 * refcount blocks, so just check it in a rough way.
Tao Mabcbbb242009-08-18 11:29:12 +08002531 *
2532 * Caller must hold refcount tree lock.
2533 */
2534int ocfs2_prepare_refcount_change_for_del(struct inode *inode,
Tristan Ye78f94672010-05-11 17:54:42 +08002535 u64 refcount_loc,
Tao Mabcbbb242009-08-18 11:29:12 +08002536 u64 phys_blkno,
2537 u32 clusters,
2538 int *credits,
Tristan Ye78f94672010-05-11 17:54:42 +08002539 int *ref_blocks)
Tao Mabcbbb242009-08-18 11:29:12 +08002540{
Tristan Ye78f94672010-05-11 17:54:42 +08002541 int ret;
Tao Mabcbbb242009-08-18 11:29:12 +08002542 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),
Tristan Ye78f94672010-05-11 17:54:42 +08002558 refcount_loc, &tree);
Tao Mabcbbb242009-08-18 11:29:12 +08002559 if (ret) {
2560 mlog_errno(ret);
2561 goto out;
2562 }
2563
Tristan Ye78f94672010-05-11 17:54:42 +08002564 ret = ocfs2_read_refcount_block(&tree->rf_ci, refcount_loc,
Tao Mabcbbb242009-08-18 11:29:12 +08002565 &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,
Tristan Ye78f94672010-05-11 17:54:42 +08002575 ref_blocks, credits);
Tao Mabcbbb242009-08-18 11:29:12 +08002576 if (ret) {
2577 mlog_errno(ret);
2578 goto out;
2579 }
2580
Tao Ma198aac22011-02-22 08:20:04 +08002581 trace_ocfs2_prepare_refcount_change_for_del(*ref_blocks, *credits);
Tao Mabcbbb242009-08-18 11:29:12 +08002582
2583out:
2584 brelse(ref_root_bh);
2585 return ret;
2586}
Tao Ma6f70fa52009-08-25 08:05:12 +08002587
2588#define MAX_CONTIG_BYTES 1048576
2589
2590static inline unsigned int ocfs2_cow_contig_clusters(struct super_block *sb)
2591{
2592 return ocfs2_clusters_for_bytes(sb, MAX_CONTIG_BYTES);
2593}
2594
2595static inline unsigned int ocfs2_cow_contig_mask(struct super_block *sb)
2596{
2597 return ~(ocfs2_cow_contig_clusters(sb) - 1);
2598}
2599
2600/*
2601 * Given an extent that starts at 'start' and an I/O that starts at 'cpos',
2602 * find an offset (start + (n * contig_clusters)) that is closest to cpos
2603 * while still being less than or equal to it.
2604 *
2605 * The goal is to break the extent at a multiple of contig_clusters.
2606 */
2607static inline unsigned int ocfs2_cow_align_start(struct super_block *sb,
2608 unsigned int start,
2609 unsigned int cpos)
2610{
2611 BUG_ON(start > cpos);
2612
2613 return start + ((cpos - start) & ocfs2_cow_contig_mask(sb));
2614}
2615
2616/*
2617 * Given a cluster count of len, pad it out so that it is a multiple
2618 * of contig_clusters.
2619 */
2620static inline unsigned int ocfs2_cow_align_length(struct super_block *sb,
2621 unsigned int len)
2622{
2623 unsigned int padded =
2624 (len + (ocfs2_cow_contig_clusters(sb) - 1)) &
2625 ocfs2_cow_contig_mask(sb);
2626
2627 /* Did we wrap? */
2628 if (padded < len)
2629 padded = UINT_MAX;
2630
2631 return padded;
2632}
2633
2634/*
2635 * Calculate out the start and number of virtual clusters we need to to CoW.
2636 *
2637 * cpos is vitual start cluster position we want to do CoW in a
2638 * file and write_len is the cluster length.
Tao Ma37f8a2b2009-08-26 09:47:28 +08002639 * max_cpos is the place where we want to stop CoW intentionally.
Tao Ma6f70fa52009-08-25 08:05:12 +08002640 *
2641 * Normal we will start CoW from the beginning of extent record cotaining cpos.
2642 * We try to break up extents on boundaries of MAX_CONTIG_BYTES so that we
2643 * get good I/O from the resulting extent tree.
2644 */
2645static int ocfs2_refcount_cal_cow_clusters(struct inode *inode,
Tao Ma913580b2009-08-24 14:31:03 +08002646 struct ocfs2_extent_list *el,
Tao Ma6f70fa52009-08-25 08:05:12 +08002647 u32 cpos,
2648 u32 write_len,
Tao Ma37f8a2b2009-08-26 09:47:28 +08002649 u32 max_cpos,
Tao Ma6f70fa52009-08-25 08:05:12 +08002650 u32 *cow_start,
2651 u32 *cow_len)
2652{
2653 int ret = 0;
Tao Ma6f70fa52009-08-25 08:05:12 +08002654 int tree_height = le16_to_cpu(el->l_tree_depth), i;
2655 struct buffer_head *eb_bh = NULL;
2656 struct ocfs2_extent_block *eb = NULL;
2657 struct ocfs2_extent_rec *rec;
2658 unsigned int want_clusters, rec_end = 0;
2659 int contig_clusters = ocfs2_cow_contig_clusters(inode->i_sb);
2660 int leaf_clusters;
2661
Tao Ma37f8a2b2009-08-26 09:47:28 +08002662 BUG_ON(cpos + write_len > max_cpos);
2663
Tao Ma6f70fa52009-08-25 08:05:12 +08002664 if (tree_height > 0) {
2665 ret = ocfs2_find_leaf(INODE_CACHE(inode), el, cpos, &eb_bh);
2666 if (ret) {
2667 mlog_errno(ret);
2668 goto out;
2669 }
2670
2671 eb = (struct ocfs2_extent_block *) eb_bh->b_data;
2672 el = &eb->h_list;
2673
2674 if (el->l_tree_depth) {
2675 ocfs2_error(inode->i_sb,
2676 "Inode %lu has non zero tree depth in "
2677 "leaf block %llu\n", inode->i_ino,
2678 (unsigned long long)eb_bh->b_blocknr);
2679 ret = -EROFS;
2680 goto out;
2681 }
2682 }
2683
2684 *cow_len = 0;
2685 for (i = 0; i < le16_to_cpu(el->l_next_free_rec); i++) {
2686 rec = &el->l_recs[i];
2687
2688 if (ocfs2_is_empty_extent(rec)) {
2689 mlog_bug_on_msg(i != 0, "Inode %lu has empty record in "
2690 "index %d\n", inode->i_ino, i);
2691 continue;
2692 }
2693
2694 if (le32_to_cpu(rec->e_cpos) +
2695 le16_to_cpu(rec->e_leaf_clusters) <= cpos)
2696 continue;
2697
2698 if (*cow_len == 0) {
2699 /*
2700 * We should find a refcounted record in the
2701 * first pass.
2702 */
2703 BUG_ON(!(rec->e_flags & OCFS2_EXT_REFCOUNTED));
2704 *cow_start = le32_to_cpu(rec->e_cpos);
2705 }
2706
2707 /*
Tao Ma37f8a2b2009-08-26 09:47:28 +08002708 * If we encounter a hole, a non-refcounted record or
2709 * pass the max_cpos, stop the search.
Tao Ma6f70fa52009-08-25 08:05:12 +08002710 */
2711 if ((!(rec->e_flags & OCFS2_EXT_REFCOUNTED)) ||
Tao Ma37f8a2b2009-08-26 09:47:28 +08002712 (*cow_len && rec_end != le32_to_cpu(rec->e_cpos)) ||
2713 (max_cpos <= le32_to_cpu(rec->e_cpos)))
Tao Ma6f70fa52009-08-25 08:05:12 +08002714 break;
2715
2716 leaf_clusters = le16_to_cpu(rec->e_leaf_clusters);
2717 rec_end = le32_to_cpu(rec->e_cpos) + leaf_clusters;
Tao Ma37f8a2b2009-08-26 09:47:28 +08002718 if (rec_end > max_cpos) {
2719 rec_end = max_cpos;
2720 leaf_clusters = rec_end - le32_to_cpu(rec->e_cpos);
2721 }
Tao Ma6f70fa52009-08-25 08:05:12 +08002722
2723 /*
2724 * How many clusters do we actually need from
2725 * this extent? First we see how many we actually
2726 * need to complete the write. If that's smaller
2727 * than contig_clusters, we try for contig_clusters.
2728 */
2729 if (!*cow_len)
2730 want_clusters = write_len;
2731 else
2732 want_clusters = (cpos + write_len) -
2733 (*cow_start + *cow_len);
2734 if (want_clusters < contig_clusters)
2735 want_clusters = contig_clusters;
2736
2737 /*
2738 * If the write does not cover the whole extent, we
2739 * need to calculate how we're going to split the extent.
2740 * We try to do it on contig_clusters boundaries.
2741 *
2742 * Any extent smaller than contig_clusters will be
2743 * CoWed in its entirety.
2744 */
2745 if (leaf_clusters <= contig_clusters)
2746 *cow_len += leaf_clusters;
2747 else if (*cow_len || (*cow_start == cpos)) {
2748 /*
2749 * This extent needs to be CoW'd from its
2750 * beginning, so all we have to do is compute
2751 * how many clusters to grab. We align
2752 * want_clusters to the edge of contig_clusters
2753 * to get better I/O.
2754 */
2755 want_clusters = ocfs2_cow_align_length(inode->i_sb,
2756 want_clusters);
2757
2758 if (leaf_clusters < want_clusters)
2759 *cow_len += leaf_clusters;
2760 else
2761 *cow_len += want_clusters;
2762 } else if ((*cow_start + contig_clusters) >=
2763 (cpos + write_len)) {
2764 /*
2765 * Breaking off contig_clusters at the front
2766 * of the extent will cover our write. That's
2767 * easy.
2768 */
2769 *cow_len = contig_clusters;
2770 } else if ((rec_end - cpos) <= contig_clusters) {
2771 /*
2772 * Breaking off contig_clusters at the tail of
2773 * this extent will cover cpos.
2774 */
2775 *cow_start = rec_end - contig_clusters;
2776 *cow_len = contig_clusters;
2777 } else if ((rec_end - cpos) <= want_clusters) {
2778 /*
2779 * While we can't fit the entire write in this
2780 * extent, we know that the write goes from cpos
2781 * to the end of the extent. Break that off.
2782 * We try to break it at some multiple of
2783 * contig_clusters from the front of the extent.
2784 * Failing that (ie, cpos is within
2785 * contig_clusters of the front), we'll CoW the
2786 * entire extent.
2787 */
2788 *cow_start = ocfs2_cow_align_start(inode->i_sb,
2789 *cow_start, cpos);
2790 *cow_len = rec_end - *cow_start;
2791 } else {
2792 /*
2793 * Ok, the entire write lives in the middle of
2794 * this extent. Let's try to slice the extent up
2795 * nicely. Optimally, our CoW region starts at
2796 * m*contig_clusters from the beginning of the
2797 * extent and goes for n*contig_clusters,
2798 * covering the entire write.
2799 */
2800 *cow_start = ocfs2_cow_align_start(inode->i_sb,
2801 *cow_start, cpos);
2802
2803 want_clusters = (cpos + write_len) - *cow_start;
2804 want_clusters = ocfs2_cow_align_length(inode->i_sb,
2805 want_clusters);
2806 if (*cow_start + want_clusters <= rec_end)
2807 *cow_len = want_clusters;
2808 else
2809 *cow_len = rec_end - *cow_start;
2810 }
2811
2812 /* Have we covered our entire write yet? */
2813 if ((*cow_start + *cow_len) >= (cpos + write_len))
2814 break;
2815
2816 /*
2817 * If we reach the end of the extent block and don't get enough
2818 * clusters, continue with the next extent block if possible.
2819 */
2820 if (i + 1 == le16_to_cpu(el->l_next_free_rec) &&
2821 eb && eb->h_next_leaf_blk) {
2822 brelse(eb_bh);
2823 eb_bh = NULL;
2824
2825 ret = ocfs2_read_extent_block(INODE_CACHE(inode),
2826 le64_to_cpu(eb->h_next_leaf_blk),
2827 &eb_bh);
2828 if (ret) {
2829 mlog_errno(ret);
2830 goto out;
2831 }
2832
2833 eb = (struct ocfs2_extent_block *) eb_bh->b_data;
2834 el = &eb->h_list;
2835 i = -1;
2836 }
2837 }
2838
2839out:
2840 brelse(eb_bh);
2841 return ret;
2842}
2843
2844/*
2845 * Prepare meta_ac, data_ac and calculate credits when we want to add some
2846 * num_clusters in data_tree "et" and change the refcount for the old
2847 * clusters(starting form p_cluster) in the refcount tree.
2848 *
2849 * Note:
2850 * 1. since we may split the old tree, so we at most will need num_clusters + 2
2851 * more new leaf records.
2852 * 2. In some case, we may not need to reserve new clusters(e.g, reflink), so
2853 * just give data_ac = NULL.
2854 */
2855static int ocfs2_lock_refcount_allocators(struct super_block *sb,
2856 u32 p_cluster, u32 num_clusters,
2857 struct ocfs2_extent_tree *et,
2858 struct ocfs2_caching_info *ref_ci,
2859 struct buffer_head *ref_root_bh,
2860 struct ocfs2_alloc_context **meta_ac,
2861 struct ocfs2_alloc_context **data_ac,
2862 int *credits)
2863{
2864 int ret = 0, meta_add = 0;
2865 int num_free_extents = ocfs2_num_free_extents(OCFS2_SB(sb), et);
2866
2867 if (num_free_extents < 0) {
2868 ret = num_free_extents;
2869 mlog_errno(ret);
2870 goto out;
2871 }
2872
2873 if (num_free_extents < num_clusters + 2)
2874 meta_add =
2875 ocfs2_extend_meta_needed(et->et_root_el);
2876
Goldwyn Rodrigues06f9da62013-11-12 15:06:52 -08002877 *credits += ocfs2_calc_extend_credits(sb, et->et_root_el);
Tao Ma6f70fa52009-08-25 08:05:12 +08002878
2879 ret = ocfs2_calc_refcount_meta_credits(sb, ref_ci, ref_root_bh,
2880 p_cluster, num_clusters,
2881 &meta_add, credits);
2882 if (ret) {
2883 mlog_errno(ret);
2884 goto out;
2885 }
2886
Tao Ma198aac22011-02-22 08:20:04 +08002887 trace_ocfs2_lock_refcount_allocators(meta_add, *credits);
Tao Ma6f70fa52009-08-25 08:05:12 +08002888 ret = ocfs2_reserve_new_metadata_blocks(OCFS2_SB(sb), meta_add,
2889 meta_ac);
2890 if (ret) {
2891 mlog_errno(ret);
2892 goto out;
2893 }
2894
2895 if (data_ac) {
2896 ret = ocfs2_reserve_clusters(OCFS2_SB(sb), num_clusters,
2897 data_ac);
2898 if (ret)
2899 mlog_errno(ret);
2900 }
2901
2902out:
2903 if (ret) {
2904 if (*meta_ac) {
2905 ocfs2_free_alloc_context(*meta_ac);
2906 *meta_ac = NULL;
2907 }
2908 }
2909
2910 return ret;
2911}
2912
2913static int ocfs2_clear_cow_buffer(handle_t *handle, struct buffer_head *bh)
2914{
2915 BUG_ON(buffer_dirty(bh));
2916
2917 clear_buffer_mapped(bh);
2918
2919 return 0;
2920}
2921
Tristan Ye3e19a252011-05-24 16:21:20 +08002922int ocfs2_duplicate_clusters_by_page(handle_t *handle,
Tiger Yangc7dd3392013-08-13 16:00:58 -07002923 struct inode *inode,
Tristan Ye3e19a252011-05-24 16:21:20 +08002924 u32 cpos, u32 old_cluster,
2925 u32 new_cluster, u32 new_len)
Tao Ma6f70fa52009-08-25 08:05:12 +08002926{
2927 int ret = 0, partial;
Tiger Yangc7dd3392013-08-13 16:00:58 -07002928 struct super_block *sb = inode->i_sb;
Tao Ma6f70fa52009-08-25 08:05:12 +08002929 u64 new_block = ocfs2_clusters_to_blocks(sb, new_cluster);
2930 struct page *page;
2931 pgoff_t page_index;
Tao Ma6ea48432010-08-12 10:31:34 +08002932 unsigned int from, to, readahead_pages;
Tao Ma6f70fa52009-08-25 08:05:12 +08002933 loff_t offset, end, map_end;
Tristan Ye3e19a252011-05-24 16:21:20 +08002934 struct address_space *mapping = inode->i_mapping;
Tao Ma6f70fa52009-08-25 08:05:12 +08002935
Tao Ma198aac22011-02-22 08:20:04 +08002936 trace_ocfs2_duplicate_clusters_by_page(cpos, old_cluster,
2937 new_cluster, new_len);
Tao Ma6f70fa52009-08-25 08:05:12 +08002938
Tao Ma6ea48432010-08-12 10:31:34 +08002939 readahead_pages =
2940 (ocfs2_cow_contig_clusters(sb) <<
2941 OCFS2_SB(sb)->s_clustersize_bits) >> PAGE_CACHE_SHIFT;
Tao Ma6f70fa52009-08-25 08:05:12 +08002942 offset = ((loff_t)cpos) << OCFS2_SB(sb)->s_clustersize_bits;
2943 end = offset + (new_len << OCFS2_SB(sb)->s_clustersize_bits);
Tao Maf5e27b62010-07-14 11:19:32 +08002944 /*
2945 * We only duplicate pages until we reach the page contains i_size - 1.
2946 * So trim 'end' to i_size.
2947 */
Tristan Ye3e19a252011-05-24 16:21:20 +08002948 if (end > i_size_read(inode))
2949 end = i_size_read(inode);
Tao Ma6f70fa52009-08-25 08:05:12 +08002950
2951 while (offset < end) {
2952 page_index = offset >> PAGE_CACHE_SHIFT;
Tao Mad622b892010-01-30 23:32:19 +08002953 map_end = ((loff_t)page_index + 1) << PAGE_CACHE_SHIFT;
Tao Ma6f70fa52009-08-25 08:05:12 +08002954 if (map_end > end)
2955 map_end = end;
2956
2957 /* from, to is the offset within the page. */
2958 from = offset & (PAGE_CACHE_SIZE - 1);
2959 to = PAGE_CACHE_SIZE;
2960 if (map_end & (PAGE_CACHE_SIZE - 1))
2961 to = map_end & (PAGE_CACHE_SIZE - 1);
2962
Jan Kara9b4c0ff2010-08-24 14:28:03 +02002963 page = find_or_create_page(mapping, page_index, GFP_NOFS);
Gu Zheng62c61042013-07-31 13:53:29 -07002964 if (!page) {
2965 ret = -ENOMEM;
2966 mlog_errno(ret);
2967 break;
2968 }
Tao Ma6f70fa52009-08-25 08:05:12 +08002969
Tao Ma0a1ea432010-02-01 17:05:33 +08002970 /*
2971 * In case PAGE_CACHE_SIZE <= CLUSTER_SIZE, This page
2972 * can't be dirtied before we CoW it out.
2973 */
2974 if (PAGE_CACHE_SIZE <= OCFS2_SB(sb)->s_clustersize)
2975 BUG_ON(PageDirty(page));
Tao Ma6f70fa52009-08-25 08:05:12 +08002976
2977 if (!PageUptodate(page)) {
2978 ret = block_read_full_page(page, ocfs2_get_block);
2979 if (ret) {
2980 mlog_errno(ret);
2981 goto unlock;
2982 }
2983 lock_page(page);
2984 }
2985
2986 if (page_has_buffers(page)) {
2987 ret = walk_page_buffers(handle, page_buffers(page),
2988 from, to, &partial,
2989 ocfs2_clear_cow_buffer);
2990 if (ret) {
2991 mlog_errno(ret);
2992 goto unlock;
2993 }
2994 }
2995
Tiger Yangc7dd3392013-08-13 16:00:58 -07002996 ocfs2_map_and_dirty_page(inode,
2997 handle, from, to,
Tao Ma6f70fa52009-08-25 08:05:12 +08002998 page, 0, &new_block);
2999 mark_page_accessed(page);
3000unlock:
3001 unlock_page(page);
3002 page_cache_release(page);
3003 page = NULL;
3004 offset = map_end;
3005 if (ret)
3006 break;
3007 }
3008
3009 return ret;
3010}
3011
Tristan Ye3e19a252011-05-24 16:21:20 +08003012int ocfs2_duplicate_clusters_by_jbd(handle_t *handle,
Tiger Yangc7dd3392013-08-13 16:00:58 -07003013 struct inode *inode,
Tristan Ye3e19a252011-05-24 16:21:20 +08003014 u32 cpos, u32 old_cluster,
3015 u32 new_cluster, u32 new_len)
Tao Ma492a8a32009-08-18 11:43:17 +08003016{
3017 int ret = 0;
Tristan Ye3e19a252011-05-24 16:21:20 +08003018 struct super_block *sb = inode->i_sb;
3019 struct ocfs2_caching_info *ci = INODE_CACHE(inode);
Tao Ma492a8a32009-08-18 11:43:17 +08003020 int i, blocks = ocfs2_clusters_to_blocks(sb, new_len);
3021 u64 old_block = ocfs2_clusters_to_blocks(sb, old_cluster);
3022 u64 new_block = ocfs2_clusters_to_blocks(sb, new_cluster);
3023 struct ocfs2_super *osb = OCFS2_SB(sb);
3024 struct buffer_head *old_bh = NULL;
3025 struct buffer_head *new_bh = NULL;
3026
Tao Ma198aac22011-02-22 08:20:04 +08003027 trace_ocfs2_duplicate_clusters_by_page(cpos, old_cluster,
3028 new_cluster, new_len);
Tao Ma492a8a32009-08-18 11:43:17 +08003029
3030 for (i = 0; i < blocks; i++, old_block++, new_block++) {
3031 new_bh = sb_getblk(osb->sb, new_block);
3032 if (new_bh == NULL) {
Rui Xiang7391a292013-11-12 15:06:54 -08003033 ret = -ENOMEM;
Tao Ma492a8a32009-08-18 11:43:17 +08003034 mlog_errno(ret);
3035 break;
3036 }
3037
3038 ocfs2_set_new_buffer_uptodate(ci, new_bh);
3039
3040 ret = ocfs2_read_block(ci, old_block, &old_bh, NULL);
3041 if (ret) {
3042 mlog_errno(ret);
3043 break;
3044 }
3045
3046 ret = ocfs2_journal_access(handle, ci, new_bh,
3047 OCFS2_JOURNAL_ACCESS_CREATE);
3048 if (ret) {
3049 mlog_errno(ret);
3050 break;
3051 }
3052
3053 memcpy(new_bh->b_data, old_bh->b_data, sb->s_blocksize);
Joel Beckerec20cec2010-03-19 14:13:52 -07003054 ocfs2_journal_dirty(handle, new_bh);
Tao Ma492a8a32009-08-18 11:43:17 +08003055
3056 brelse(new_bh);
3057 brelse(old_bh);
3058 new_bh = NULL;
3059 old_bh = NULL;
3060 }
3061
3062 brelse(new_bh);
3063 brelse(old_bh);
3064 return ret;
3065}
3066
Tao Ma6f70fa52009-08-25 08:05:12 +08003067static int ocfs2_clear_ext_refcount(handle_t *handle,
3068 struct ocfs2_extent_tree *et,
3069 u32 cpos, u32 p_cluster, u32 len,
3070 unsigned int ext_flags,
3071 struct ocfs2_alloc_context *meta_ac,
3072 struct ocfs2_cached_dealloc_ctxt *dealloc)
3073{
3074 int ret, index;
3075 struct ocfs2_extent_rec replace_rec;
3076 struct ocfs2_path *path = NULL;
3077 struct ocfs2_extent_list *el;
3078 struct super_block *sb = ocfs2_metadata_cache_get_super(et->et_ci);
3079 u64 ino = ocfs2_metadata_cache_owner(et->et_ci);
3080
Tao Ma198aac22011-02-22 08:20:04 +08003081 trace_ocfs2_clear_ext_refcount((unsigned long long)ino,
3082 cpos, len, p_cluster, ext_flags);
Tao Ma6f70fa52009-08-25 08:05:12 +08003083
3084 memset(&replace_rec, 0, sizeof(replace_rec));
3085 replace_rec.e_cpos = cpu_to_le32(cpos);
3086 replace_rec.e_leaf_clusters = cpu_to_le16(len);
3087 replace_rec.e_blkno = cpu_to_le64(ocfs2_clusters_to_blocks(sb,
3088 p_cluster));
3089 replace_rec.e_flags = ext_flags;
3090 replace_rec.e_flags &= ~OCFS2_EXT_REFCOUNTED;
3091
3092 path = ocfs2_new_path_from_et(et);
3093 if (!path) {
3094 ret = -ENOMEM;
3095 mlog_errno(ret);
3096 goto out;
3097 }
3098
3099 ret = ocfs2_find_path(et->et_ci, path, cpos);
3100 if (ret) {
3101 mlog_errno(ret);
3102 goto out;
3103 }
3104
3105 el = path_leaf_el(path);
3106
3107 index = ocfs2_search_extent_list(el, cpos);
Yingtai Xie981035b2014-08-06 16:03:54 -07003108 if (index == -1) {
Tao Ma6f70fa52009-08-25 08:05:12 +08003109 ocfs2_error(sb,
3110 "Inode %llu has an extent at cpos %u which can no "
3111 "longer be found.\n",
3112 (unsigned long long)ino, cpos);
3113 ret = -EROFS;
3114 goto out;
3115 }
3116
3117 ret = ocfs2_split_extent(handle, et, path, index,
3118 &replace_rec, meta_ac, dealloc);
3119 if (ret)
3120 mlog_errno(ret);
3121
3122out:
3123 ocfs2_free_path(path);
3124 return ret;
3125}
3126
3127static int ocfs2_replace_clusters(handle_t *handle,
3128 struct ocfs2_cow_context *context,
3129 u32 cpos, u32 old,
3130 u32 new, u32 len,
3131 unsigned int ext_flags)
3132{
3133 int ret;
Tao Ma913580b2009-08-24 14:31:03 +08003134 struct ocfs2_caching_info *ci = context->data_et.et_ci;
Tao Ma6f70fa52009-08-25 08:05:12 +08003135 u64 ino = ocfs2_metadata_cache_owner(ci);
3136
Tao Ma198aac22011-02-22 08:20:04 +08003137 trace_ocfs2_replace_clusters((unsigned long long)ino,
3138 cpos, old, new, len, ext_flags);
Tao Ma6f70fa52009-08-25 08:05:12 +08003139
3140 /*If the old clusters is unwritten, no need to duplicate. */
3141 if (!(ext_flags & OCFS2_EXT_UNWRITTEN)) {
Tiger Yangc7dd3392013-08-13 16:00:58 -07003142 ret = context->cow_duplicate_clusters(handle, context->inode,
Tristan Ye3e19a252011-05-24 16:21:20 +08003143 cpos, old, new, len);
Tao Ma6f70fa52009-08-25 08:05:12 +08003144 if (ret) {
3145 mlog_errno(ret);
3146 goto out;
3147 }
3148 }
3149
Tao Ma913580b2009-08-24 14:31:03 +08003150 ret = ocfs2_clear_ext_refcount(handle, &context->data_et,
Tao Ma6f70fa52009-08-25 08:05:12 +08003151 cpos, new, len, ext_flags,
3152 context->meta_ac, &context->dealloc);
3153 if (ret)
3154 mlog_errno(ret);
3155out:
3156 return ret;
3157}
3158
Tristan Ye3e19a252011-05-24 16:21:20 +08003159int ocfs2_cow_sync_writeback(struct super_block *sb,
3160 struct inode *inode,
3161 u32 cpos, u32 num_clusters)
Tao Ma6f70fa52009-08-25 08:05:12 +08003162{
3163 int ret = 0;
3164 loff_t offset, end, map_end;
3165 pgoff_t page_index;
3166 struct page *page;
3167
Tristan Ye3e19a252011-05-24 16:21:20 +08003168 if (ocfs2_should_order_data(inode))
Tao Ma6f70fa52009-08-25 08:05:12 +08003169 return 0;
3170
3171 offset = ((loff_t)cpos) << OCFS2_SB(sb)->s_clustersize_bits;
3172 end = offset + (num_clusters << OCFS2_SB(sb)->s_clustersize_bits);
3173
Tristan Ye3e19a252011-05-24 16:21:20 +08003174 ret = filemap_fdatawrite_range(inode->i_mapping,
Tao Ma6f70fa52009-08-25 08:05:12 +08003175 offset, end - 1);
3176 if (ret < 0) {
3177 mlog_errno(ret);
3178 return ret;
3179 }
3180
3181 while (offset < end) {
3182 page_index = offset >> PAGE_CACHE_SHIFT;
Tao Mad622b892010-01-30 23:32:19 +08003183 map_end = ((loff_t)page_index + 1) << PAGE_CACHE_SHIFT;
Tao Ma6f70fa52009-08-25 08:05:12 +08003184 if (map_end > end)
3185 map_end = end;
3186
Tristan Ye3e19a252011-05-24 16:21:20 +08003187 page = find_or_create_page(inode->i_mapping,
Jan Kara9b4c0ff2010-08-24 14:28:03 +02003188 page_index, GFP_NOFS);
Tao Ma6f70fa52009-08-25 08:05:12 +08003189 BUG_ON(!page);
3190
3191 wait_on_page_writeback(page);
3192 if (PageError(page)) {
3193 ret = -EIO;
3194 mlog_errno(ret);
3195 } else
3196 mark_page_accessed(page);
3197
3198 unlock_page(page);
3199 page_cache_release(page);
3200 page = NULL;
3201 offset = map_end;
3202 if (ret)
3203 break;
3204 }
3205
3206 return ret;
3207}
3208
Tao Ma913580b2009-08-24 14:31:03 +08003209static int ocfs2_di_get_clusters(struct ocfs2_cow_context *context,
3210 u32 v_cluster, u32 *p_cluster,
3211 u32 *num_clusters,
3212 unsigned int *extent_flags)
3213{
3214 return ocfs2_get_clusters(context->inode, v_cluster, p_cluster,
3215 num_clusters, extent_flags);
3216}
3217
Tao Ma6f70fa52009-08-25 08:05:12 +08003218static int ocfs2_make_clusters_writable(struct super_block *sb,
3219 struct ocfs2_cow_context *context,
3220 u32 cpos, u32 p_cluster,
3221 u32 num_clusters, unsigned int e_flags)
3222{
Tao Ma6ae23c52009-08-18 11:30:55 +08003223 int ret, delete, index, credits = 0;
Tristan Yeacf3bb02011-01-21 18:20:18 +08003224 u32 new_bit, new_len, orig_num_clusters;
Tao Ma6ae23c52009-08-18 11:30:55 +08003225 unsigned int set_len;
Tao Ma6f70fa52009-08-25 08:05:12 +08003226 struct ocfs2_super *osb = OCFS2_SB(sb);
3227 handle_t *handle;
Tao Ma6ae23c52009-08-18 11:30:55 +08003228 struct buffer_head *ref_leaf_bh = NULL;
Tao Ma913580b2009-08-24 14:31:03 +08003229 struct ocfs2_caching_info *ref_ci = &context->ref_tree->rf_ci;
Tao Ma6ae23c52009-08-18 11:30:55 +08003230 struct ocfs2_refcount_rec rec;
3231
Tao Ma198aac22011-02-22 08:20:04 +08003232 trace_ocfs2_make_clusters_writable(cpos, p_cluster,
3233 num_clusters, e_flags);
Tao Ma6f70fa52009-08-25 08:05:12 +08003234
3235 ret = ocfs2_lock_refcount_allocators(sb, p_cluster, num_clusters,
Tao Ma913580b2009-08-24 14:31:03 +08003236 &context->data_et,
3237 ref_ci,
Tao Ma6f70fa52009-08-25 08:05:12 +08003238 context->ref_root_bh,
3239 &context->meta_ac,
3240 &context->data_ac, &credits);
3241 if (ret) {
3242 mlog_errno(ret);
3243 return ret;
3244 }
3245
Tao Ma492a8a32009-08-18 11:43:17 +08003246 if (context->post_refcount)
3247 credits += context->post_refcount->credits;
3248
3249 credits += context->extra_credits;
Tao Ma6f70fa52009-08-25 08:05:12 +08003250 handle = ocfs2_start_trans(osb, credits);
3251 if (IS_ERR(handle)) {
3252 ret = PTR_ERR(handle);
3253 mlog_errno(ret);
3254 goto out;
3255 }
3256
Tristan Yeacf3bb02011-01-21 18:20:18 +08003257 orig_num_clusters = num_clusters;
3258
Tao Ma6f70fa52009-08-25 08:05:12 +08003259 while (num_clusters) {
Tao Ma913580b2009-08-24 14:31:03 +08003260 ret = ocfs2_get_refcount_rec(ref_ci, context->ref_root_bh,
Tao Ma6ae23c52009-08-18 11:30:55 +08003261 p_cluster, num_clusters,
3262 &rec, &index, &ref_leaf_bh);
Tao Ma6f70fa52009-08-25 08:05:12 +08003263 if (ret) {
3264 mlog_errno(ret);
3265 goto out_commit;
3266 }
3267
Tao Ma6ae23c52009-08-18 11:30:55 +08003268 BUG_ON(!rec.r_refcount);
3269 set_len = min((u64)p_cluster + num_clusters,
3270 le64_to_cpu(rec.r_cpos) +
3271 le32_to_cpu(rec.r_clusters)) - p_cluster;
3272
3273 /*
3274 * There are many different situation here.
3275 * 1. If refcount == 1, remove the flag and don't COW.
3276 * 2. If refcount > 1, allocate clusters.
3277 * Here we may not allocate r_len once at a time, so continue
3278 * until we reach num_clusters.
3279 */
3280 if (le32_to_cpu(rec.r_refcount) == 1) {
3281 delete = 0;
Tao Ma913580b2009-08-24 14:31:03 +08003282 ret = ocfs2_clear_ext_refcount(handle,
3283 &context->data_et,
Tao Ma6ae23c52009-08-18 11:30:55 +08003284 cpos, p_cluster,
3285 set_len, e_flags,
3286 context->meta_ac,
3287 &context->dealloc);
3288 if (ret) {
3289 mlog_errno(ret);
3290 goto out_commit;
3291 }
3292 } else {
3293 delete = 1;
3294
Joel Becker1ed9b772010-05-06 13:59:06 +08003295 ret = __ocfs2_claim_clusters(handle,
Tao Ma6ae23c52009-08-18 11:30:55 +08003296 context->data_ac,
3297 1, set_len,
3298 &new_bit, &new_len);
3299 if (ret) {
3300 mlog_errno(ret);
3301 goto out_commit;
3302 }
3303
3304 ret = ocfs2_replace_clusters(handle, context,
3305 cpos, p_cluster, new_bit,
3306 new_len, e_flags);
3307 if (ret) {
3308 mlog_errno(ret);
3309 goto out_commit;
3310 }
3311 set_len = new_len;
3312 }
3313
Tao Ma913580b2009-08-24 14:31:03 +08003314 ret = __ocfs2_decrease_refcount(handle, ref_ci,
Tao Ma6ae23c52009-08-18 11:30:55 +08003315 context->ref_root_bh,
3316 p_cluster, set_len,
3317 context->meta_ac,
3318 &context->dealloc, delete);
Tao Ma6f70fa52009-08-25 08:05:12 +08003319 if (ret) {
3320 mlog_errno(ret);
3321 goto out_commit;
3322 }
3323
Tao Ma6ae23c52009-08-18 11:30:55 +08003324 cpos += set_len;
3325 p_cluster += set_len;
3326 num_clusters -= set_len;
3327 brelse(ref_leaf_bh);
3328 ref_leaf_bh = NULL;
Tao Ma6f70fa52009-08-25 08:05:12 +08003329 }
3330
Tao Ma492a8a32009-08-18 11:43:17 +08003331 /* handle any post_cow action. */
3332 if (context->post_refcount && context->post_refcount->func) {
3333 ret = context->post_refcount->func(context->inode, handle,
3334 context->post_refcount->para);
3335 if (ret) {
3336 mlog_errno(ret);
3337 goto out_commit;
3338 }
3339 }
3340
Tao Ma6f70fa52009-08-25 08:05:12 +08003341 /*
3342 * Here we should write the new page out first if we are
3343 * in write-back mode.
3344 */
Tao Ma492a8a32009-08-18 11:43:17 +08003345 if (context->get_clusters == ocfs2_di_get_clusters) {
Tristan Ye3e19a252011-05-24 16:21:20 +08003346 ret = ocfs2_cow_sync_writeback(sb, context->inode, cpos,
Tristan Yeacf3bb02011-01-21 18:20:18 +08003347 orig_num_clusters);
Tao Ma492a8a32009-08-18 11:43:17 +08003348 if (ret)
3349 mlog_errno(ret);
3350 }
Tao Ma6f70fa52009-08-25 08:05:12 +08003351
3352out_commit:
3353 ocfs2_commit_trans(osb, handle);
3354
3355out:
3356 if (context->data_ac) {
3357 ocfs2_free_alloc_context(context->data_ac);
3358 context->data_ac = NULL;
3359 }
3360 if (context->meta_ac) {
3361 ocfs2_free_alloc_context(context->meta_ac);
3362 context->meta_ac = NULL;
3363 }
Tao Ma6ae23c52009-08-18 11:30:55 +08003364 brelse(ref_leaf_bh);
Tao Ma6f70fa52009-08-25 08:05:12 +08003365
3366 return ret;
3367}
3368
Tao Ma913580b2009-08-24 14:31:03 +08003369static int ocfs2_replace_cow(struct ocfs2_cow_context *context)
Tao Ma6f70fa52009-08-25 08:05:12 +08003370{
3371 int ret = 0;
Tao Ma913580b2009-08-24 14:31:03 +08003372 struct inode *inode = context->inode;
3373 u32 cow_start = context->cow_start, cow_len = context->cow_len;
3374 u32 p_cluster, num_clusters;
Tao Ma6f70fa52009-08-25 08:05:12 +08003375 unsigned int ext_flags;
3376 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
Tao Ma6f70fa52009-08-25 08:05:12 +08003377
3378 if (!ocfs2_refcount_tree(OCFS2_SB(inode->i_sb))) {
3379 ocfs2_error(inode->i_sb, "Inode %lu want to use refcount "
3380 "tree, but the feature bit is not set in the "
3381 "super block.", inode->i_ino);
3382 return -EROFS;
3383 }
3384
Tao Ma6f70fa52009-08-25 08:05:12 +08003385 ocfs2_init_dealloc_ctxt(&context->dealloc);
Tao Ma6f70fa52009-08-25 08:05:12 +08003386
3387 while (cow_len) {
Tao Ma913580b2009-08-24 14:31:03 +08003388 ret = context->get_clusters(context, cow_start, &p_cluster,
3389 &num_clusters, &ext_flags);
Tao Ma6f70fa52009-08-25 08:05:12 +08003390 if (ret) {
3391 mlog_errno(ret);
3392 break;
3393 }
3394
3395 BUG_ON(!(ext_flags & OCFS2_EXT_REFCOUNTED));
3396
3397 if (cow_len < num_clusters)
3398 num_clusters = cow_len;
3399
3400 ret = ocfs2_make_clusters_writable(inode->i_sb, context,
3401 cow_start, p_cluster,
3402 num_clusters, ext_flags);
3403 if (ret) {
3404 mlog_errno(ret);
3405 break;
3406 }
3407
3408 cow_len -= num_clusters;
3409 cow_start += num_clusters;
3410 }
3411
Tao Ma6f70fa52009-08-25 08:05:12 +08003412 if (ocfs2_dealloc_has_cluster(&context->dealloc)) {
3413 ocfs2_schedule_truncate_log_flush(osb, 1);
3414 ocfs2_run_deallocs(osb, &context->dealloc);
3415 }
3416
Tao Ma6f70fa52009-08-25 08:05:12 +08003417 return ret;
3418}
3419
3420/*
Tao Ma37f8a2b2009-08-26 09:47:28 +08003421 * Starting at cpos, try to CoW write_len clusters. Don't CoW
3422 * past max_cpos. This will stop when it runs into a hole or an
3423 * unrefcounted extent.
Tao Ma6f70fa52009-08-25 08:05:12 +08003424 */
3425static int ocfs2_refcount_cow_hunk(struct inode *inode,
3426 struct buffer_head *di_bh,
Tao Ma37f8a2b2009-08-26 09:47:28 +08003427 u32 cpos, u32 write_len, u32 max_cpos)
Tao Ma6f70fa52009-08-25 08:05:12 +08003428{
3429 int ret;
3430 u32 cow_start = 0, cow_len = 0;
3431 struct ocfs2_inode_info *oi = OCFS2_I(inode);
3432 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3433 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
3434 struct buffer_head *ref_root_bh = NULL;
3435 struct ocfs2_refcount_tree *ref_tree;
Tao Ma913580b2009-08-24 14:31:03 +08003436 struct ocfs2_cow_context *context = NULL;
Tao Ma6f70fa52009-08-25 08:05:12 +08003437
3438 BUG_ON(!(oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL));
3439
Tao Ma913580b2009-08-24 14:31:03 +08003440 ret = ocfs2_refcount_cal_cow_clusters(inode, &di->id2.i_list,
Tao Ma37f8a2b2009-08-26 09:47:28 +08003441 cpos, write_len, max_cpos,
Tao Ma6f70fa52009-08-25 08:05:12 +08003442 &cow_start, &cow_len);
3443 if (ret) {
3444 mlog_errno(ret);
3445 goto out;
3446 }
Tao Ma37f8a2b2009-08-26 09:47:28 +08003447
Tao Ma198aac22011-02-22 08:20:04 +08003448 trace_ocfs2_refcount_cow_hunk(OCFS2_I(inode)->ip_blkno,
3449 cpos, write_len, max_cpos,
3450 cow_start, cow_len);
Tao Ma6f70fa52009-08-25 08:05:12 +08003451
3452 BUG_ON(cow_len == 0);
3453
Tao Ma913580b2009-08-24 14:31:03 +08003454 context = kzalloc(sizeof(struct ocfs2_cow_context), GFP_NOFS);
3455 if (!context) {
3456 ret = -ENOMEM;
3457 mlog_errno(ret);
3458 goto out;
3459 }
3460
Tao Ma6f70fa52009-08-25 08:05:12 +08003461 ret = ocfs2_lock_refcount_tree(osb, le64_to_cpu(di->i_refcount_loc),
3462 1, &ref_tree, &ref_root_bh);
3463 if (ret) {
3464 mlog_errno(ret);
3465 goto out;
3466 }
3467
Tao Ma913580b2009-08-24 14:31:03 +08003468 context->inode = inode;
3469 context->cow_start = cow_start;
3470 context->cow_len = cow_len;
3471 context->ref_tree = ref_tree;
3472 context->ref_root_bh = ref_root_bh;
3473 context->cow_duplicate_clusters = ocfs2_duplicate_clusters_by_page;
3474 context->get_clusters = ocfs2_di_get_clusters;
3475
3476 ocfs2_init_dinode_extent_tree(&context->data_et,
3477 INODE_CACHE(inode), di_bh);
3478
3479 ret = ocfs2_replace_cow(context);
Tao Ma6f70fa52009-08-25 08:05:12 +08003480 if (ret)
3481 mlog_errno(ret);
3482
Tao Ma913580b2009-08-24 14:31:03 +08003483 /*
3484 * truncate the extent map here since no matter whether we meet with
3485 * any error during the action, we shouldn't trust cached extent map
3486 * any more.
3487 */
3488 ocfs2_extent_map_trunc(inode, cow_start);
3489
Tao Ma6f70fa52009-08-25 08:05:12 +08003490 ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
3491 brelse(ref_root_bh);
3492out:
Tao Ma913580b2009-08-24 14:31:03 +08003493 kfree(context);
Tao Ma6f70fa52009-08-25 08:05:12 +08003494 return ret;
3495}
3496
3497/*
3498 * CoW any and all clusters between cpos and cpos+write_len.
Tao Ma37f8a2b2009-08-26 09:47:28 +08003499 * Don't CoW past max_cpos. If this returns successfully, all
3500 * clusters between cpos and cpos+write_len are safe to modify.
Tao Ma6f70fa52009-08-25 08:05:12 +08003501 */
3502int ocfs2_refcount_cow(struct inode *inode,
3503 struct buffer_head *di_bh,
Tao Ma37f8a2b2009-08-26 09:47:28 +08003504 u32 cpos, u32 write_len, u32 max_cpos)
Tao Ma6f70fa52009-08-25 08:05:12 +08003505{
3506 int ret = 0;
3507 u32 p_cluster, num_clusters;
3508 unsigned int ext_flags;
3509
3510 while (write_len) {
3511 ret = ocfs2_get_clusters(inode, cpos, &p_cluster,
3512 &num_clusters, &ext_flags);
3513 if (ret) {
3514 mlog_errno(ret);
3515 break;
3516 }
3517
3518 if (write_len < num_clusters)
3519 num_clusters = write_len;
3520
3521 if (ext_flags & OCFS2_EXT_REFCOUNTED) {
Tiger Yangc7dd3392013-08-13 16:00:58 -07003522 ret = ocfs2_refcount_cow_hunk(inode, di_bh, cpos,
Tao Ma37f8a2b2009-08-26 09:47:28 +08003523 num_clusters, max_cpos);
Tao Ma6f70fa52009-08-25 08:05:12 +08003524 if (ret) {
3525 mlog_errno(ret);
3526 break;
3527 }
3528 }
3529
3530 write_len -= num_clusters;
3531 cpos += num_clusters;
3532 }
3533
3534 return ret;
3535}
Tao Ma110a0452009-08-22 23:54:27 +08003536
Tao Ma492a8a32009-08-18 11:43:17 +08003537static int ocfs2_xattr_value_get_clusters(struct ocfs2_cow_context *context,
3538 u32 v_cluster, u32 *p_cluster,
3539 u32 *num_clusters,
3540 unsigned int *extent_flags)
3541{
3542 struct inode *inode = context->inode;
3543 struct ocfs2_xattr_value_root *xv = context->cow_object;
3544
3545 return ocfs2_xattr_get_clusters(inode, v_cluster, p_cluster,
3546 num_clusters, &xv->xr_list,
3547 extent_flags);
3548}
3549
3550/*
3551 * Given a xattr value root, calculate the most meta/credits we need for
3552 * refcount tree change if we truncate it to 0.
3553 */
3554int ocfs2_refcounted_xattr_delete_need(struct inode *inode,
3555 struct ocfs2_caching_info *ref_ci,
3556 struct buffer_head *ref_root_bh,
3557 struct ocfs2_xattr_value_root *xv,
3558 int *meta_add, int *credits)
3559{
3560 int ret = 0, index, ref_blocks = 0;
3561 u32 p_cluster, num_clusters;
3562 u32 cpos = 0, clusters = le32_to_cpu(xv->xr_clusters);
3563 struct ocfs2_refcount_block *rb;
3564 struct ocfs2_refcount_rec rec;
3565 struct buffer_head *ref_leaf_bh = NULL;
3566
3567 while (cpos < clusters) {
3568 ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster,
3569 &num_clusters, &xv->xr_list,
3570 NULL);
3571 if (ret) {
3572 mlog_errno(ret);
3573 goto out;
3574 }
3575
3576 cpos += num_clusters;
3577
3578 while (num_clusters) {
3579 ret = ocfs2_get_refcount_rec(ref_ci, ref_root_bh,
3580 p_cluster, num_clusters,
3581 &rec, &index,
3582 &ref_leaf_bh);
3583 if (ret) {
3584 mlog_errno(ret);
3585 goto out;
3586 }
3587
3588 BUG_ON(!rec.r_refcount);
3589
3590 rb = (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
3591
3592 /*
3593 * We really don't know whether the other clusters is in
3594 * this refcount block or not, so just take the worst
3595 * case that all the clusters are in this block and each
3596 * one will split a refcount rec, so totally we need
3597 * clusters * 2 new refcount rec.
3598 */
Al Viroe1bf4cc2012-04-13 12:27:11 -04003599 if (le16_to_cpu(rb->rf_records.rl_used) + clusters * 2 >
Tao Ma492a8a32009-08-18 11:43:17 +08003600 le16_to_cpu(rb->rf_records.rl_count))
3601 ref_blocks++;
3602
3603 *credits += 1;
3604 brelse(ref_leaf_bh);
3605 ref_leaf_bh = NULL;
3606
3607 if (num_clusters <= le32_to_cpu(rec.r_clusters))
3608 break;
3609 else
3610 num_clusters -= le32_to_cpu(rec.r_clusters);
3611 p_cluster += num_clusters;
3612 }
3613 }
3614
3615 *meta_add += ref_blocks;
3616 if (!ref_blocks)
3617 goto out;
3618
3619 rb = (struct ocfs2_refcount_block *)ref_root_bh->b_data;
3620 if (le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL)
3621 *credits += OCFS2_EXPAND_REFCOUNT_TREE_CREDITS;
3622 else {
3623 struct ocfs2_extent_tree et;
3624
3625 ocfs2_init_refcount_extent_tree(&et, ref_ci, ref_root_bh);
3626 *credits += ocfs2_calc_extend_credits(inode->i_sb,
Goldwyn Rodrigues06f9da62013-11-12 15:06:52 -08003627 et.et_root_el);
Tao Ma492a8a32009-08-18 11:43:17 +08003628 }
3629
3630out:
3631 brelse(ref_leaf_bh);
3632 return ret;
3633}
3634
3635/*
3636 * Do CoW for xattr.
3637 */
3638int ocfs2_refcount_cow_xattr(struct inode *inode,
3639 struct ocfs2_dinode *di,
3640 struct ocfs2_xattr_value_buf *vb,
3641 struct ocfs2_refcount_tree *ref_tree,
3642 struct buffer_head *ref_root_bh,
3643 u32 cpos, u32 write_len,
3644 struct ocfs2_post_refcount *post)
3645{
3646 int ret;
3647 struct ocfs2_xattr_value_root *xv = vb->vb_xv;
3648 struct ocfs2_inode_info *oi = OCFS2_I(inode);
3649 struct ocfs2_cow_context *context = NULL;
3650 u32 cow_start, cow_len;
3651
3652 BUG_ON(!(oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL));
3653
3654 ret = ocfs2_refcount_cal_cow_clusters(inode, &xv->xr_list,
3655 cpos, write_len, UINT_MAX,
3656 &cow_start, &cow_len);
3657 if (ret) {
3658 mlog_errno(ret);
3659 goto out;
3660 }
3661
3662 BUG_ON(cow_len == 0);
3663
3664 context = kzalloc(sizeof(struct ocfs2_cow_context), GFP_NOFS);
3665 if (!context) {
3666 ret = -ENOMEM;
3667 mlog_errno(ret);
3668 goto out;
3669 }
3670
3671 context->inode = inode;
3672 context->cow_start = cow_start;
3673 context->cow_len = cow_len;
3674 context->ref_tree = ref_tree;
Justin P. Mattock6eab04a2011-04-08 19:49:08 -07003675 context->ref_root_bh = ref_root_bh;
Tao Ma492a8a32009-08-18 11:43:17 +08003676 context->cow_object = xv;
3677
3678 context->cow_duplicate_clusters = ocfs2_duplicate_clusters_by_jbd;
3679 /* We need the extra credits for duplicate_clusters by jbd. */
3680 context->extra_credits =
3681 ocfs2_clusters_to_blocks(inode->i_sb, 1) * cow_len;
3682 context->get_clusters = ocfs2_xattr_value_get_clusters;
3683 context->post_refcount = post;
3684
3685 ocfs2_init_xattr_value_extent_tree(&context->data_et,
3686 INODE_CACHE(inode), vb);
3687
3688 ret = ocfs2_replace_cow(context);
3689 if (ret)
3690 mlog_errno(ret);
3691
3692out:
3693 kfree(context);
3694 return ret;
3695}
3696
Tao Ma110a0452009-08-22 23:54:27 +08003697/*
3698 * Insert a new extent into refcount tree and mark a extent rec
3699 * as refcounted in the dinode tree.
3700 */
3701int ocfs2_add_refcount_flag(struct inode *inode,
3702 struct ocfs2_extent_tree *data_et,
3703 struct ocfs2_caching_info *ref_ci,
3704 struct buffer_head *ref_root_bh,
3705 u32 cpos, u32 p_cluster, u32 num_clusters,
Tao Ma01292412009-09-21 13:04:19 +08003706 struct ocfs2_cached_dealloc_ctxt *dealloc,
3707 struct ocfs2_post_refcount *post)
Tao Ma110a0452009-08-22 23:54:27 +08003708{
3709 int ret;
3710 handle_t *handle;
3711 int credits = 1, ref_blocks = 0;
3712 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3713 struct ocfs2_alloc_context *meta_ac = NULL;
3714
3715 ret = ocfs2_calc_refcount_meta_credits(inode->i_sb,
3716 ref_ci, ref_root_bh,
3717 p_cluster, num_clusters,
3718 &ref_blocks, &credits);
3719 if (ret) {
3720 mlog_errno(ret);
3721 goto out;
3722 }
3723
Tao Ma198aac22011-02-22 08:20:04 +08003724 trace_ocfs2_add_refcount_flag(ref_blocks, credits);
Tao Ma110a0452009-08-22 23:54:27 +08003725
3726 if (ref_blocks) {
3727 ret = ocfs2_reserve_new_metadata_blocks(OCFS2_SB(inode->i_sb),
3728 ref_blocks, &meta_ac);
3729 if (ret) {
3730 mlog_errno(ret);
3731 goto out;
3732 }
3733 }
3734
Tao Ma01292412009-09-21 13:04:19 +08003735 if (post)
3736 credits += post->credits;
3737
Tao Ma110a0452009-08-22 23:54:27 +08003738 handle = ocfs2_start_trans(osb, credits);
3739 if (IS_ERR(handle)) {
3740 ret = PTR_ERR(handle);
3741 mlog_errno(ret);
3742 goto out;
3743 }
3744
3745 ret = ocfs2_mark_extent_refcounted(inode, data_et, handle,
3746 cpos, num_clusters, p_cluster,
3747 meta_ac, dealloc);
3748 if (ret) {
3749 mlog_errno(ret);
3750 goto out_commit;
3751 }
3752
Tao Ma7540c1a2009-08-18 11:44:03 +08003753 ret = __ocfs2_increase_refcount(handle, ref_ci, ref_root_bh,
3754 p_cluster, num_clusters, 0,
3755 meta_ac, dealloc);
Tao Ma01292412009-09-21 13:04:19 +08003756 if (ret) {
Tao Ma110a0452009-08-22 23:54:27 +08003757 mlog_errno(ret);
Tao Ma01292412009-09-21 13:04:19 +08003758 goto out_commit;
3759 }
3760
3761 if (post && post->func) {
3762 ret = post->func(inode, handle, post->para);
3763 if (ret)
3764 mlog_errno(ret);
3765 }
Tao Ma110a0452009-08-22 23:54:27 +08003766
3767out_commit:
3768 ocfs2_commit_trans(osb, handle);
3769out:
3770 if (meta_ac)
3771 ocfs2_free_alloc_context(meta_ac);
3772 return ret;
3773}
3774
Tao Maa9063ab2009-08-18 11:40:59 +08003775static int ocfs2_change_ctime(struct inode *inode,
3776 struct buffer_head *di_bh)
3777{
3778 int ret;
3779 handle_t *handle;
3780 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
3781
3782 handle = ocfs2_start_trans(OCFS2_SB(inode->i_sb),
3783 OCFS2_INODE_UPDATE_CREDITS);
3784 if (IS_ERR(handle)) {
3785 ret = PTR_ERR(handle);
3786 mlog_errno(ret);
3787 goto out;
3788 }
3789
3790 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
3791 OCFS2_JOURNAL_ACCESS_WRITE);
3792 if (ret) {
3793 mlog_errno(ret);
3794 goto out_commit;
3795 }
3796
3797 inode->i_ctime = CURRENT_TIME;
3798 di->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
3799 di->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
3800
3801 ocfs2_journal_dirty(handle, di_bh);
3802
3803out_commit:
3804 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
3805out:
3806 return ret;
3807}
3808
Tao Ma110a0452009-08-22 23:54:27 +08003809static int ocfs2_attach_refcount_tree(struct inode *inode,
3810 struct buffer_head *di_bh)
3811{
Tao Maa9063ab2009-08-18 11:40:59 +08003812 int ret, data_changed = 0;
Tao Ma110a0452009-08-22 23:54:27 +08003813 struct buffer_head *ref_root_bh = NULL;
3814 struct ocfs2_inode_info *oi = OCFS2_I(inode);
3815 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
3816 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3817 struct ocfs2_refcount_tree *ref_tree;
3818 unsigned int ext_flags;
3819 loff_t size;
3820 u32 cpos, num_clusters, clusters, p_cluster;
3821 struct ocfs2_cached_dealloc_ctxt dealloc;
3822 struct ocfs2_extent_tree di_et;
3823
3824 ocfs2_init_dealloc_ctxt(&dealloc);
3825
3826 if (!(oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL)) {
3827 ret = ocfs2_create_refcount_tree(inode, di_bh);
3828 if (ret) {
3829 mlog_errno(ret);
3830 goto out;
3831 }
3832 }
3833
3834 BUG_ON(!di->i_refcount_loc);
3835 ret = ocfs2_lock_refcount_tree(osb,
3836 le64_to_cpu(di->i_refcount_loc), 1,
3837 &ref_tree, &ref_root_bh);
3838 if (ret) {
3839 mlog_errno(ret);
3840 goto out;
3841 }
3842
Tao Ma2f48d592009-10-15 11:10:49 +08003843 if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL)
3844 goto attach_xattr;
3845
Tao Ma110a0452009-08-22 23:54:27 +08003846 ocfs2_init_dinode_extent_tree(&di_et, INODE_CACHE(inode), di_bh);
3847
3848 size = i_size_read(inode);
3849 clusters = ocfs2_clusters_for_bytes(inode->i_sb, size);
3850
3851 cpos = 0;
3852 while (cpos < clusters) {
3853 ret = ocfs2_get_clusters(inode, cpos, &p_cluster,
3854 &num_clusters, &ext_flags);
Joseph Qi2b0f6ea2013-09-11 14:19:52 -07003855 if (ret) {
3856 mlog_errno(ret);
3857 goto unlock;
3858 }
Tao Ma110a0452009-08-22 23:54:27 +08003859 if (p_cluster && !(ext_flags & OCFS2_EXT_REFCOUNTED)) {
3860 ret = ocfs2_add_refcount_flag(inode, &di_et,
3861 &ref_tree->rf_ci,
3862 ref_root_bh, cpos,
3863 p_cluster, num_clusters,
Tao Ma01292412009-09-21 13:04:19 +08003864 &dealloc, NULL);
Tao Ma110a0452009-08-22 23:54:27 +08003865 if (ret) {
3866 mlog_errno(ret);
Tao Maa9063ab2009-08-18 11:40:59 +08003867 goto unlock;
Tao Ma110a0452009-08-22 23:54:27 +08003868 }
Tao Maa9063ab2009-08-18 11:40:59 +08003869
3870 data_changed = 1;
Tao Ma110a0452009-08-22 23:54:27 +08003871 }
3872 cpos += num_clusters;
3873 }
3874
Tao Ma2f48d592009-10-15 11:10:49 +08003875attach_xattr:
Tao Ma01292412009-09-21 13:04:19 +08003876 if (oi->ip_dyn_features & OCFS2_HAS_XATTR_FL) {
3877 ret = ocfs2_xattr_attach_refcount_tree(inode, di_bh,
3878 &ref_tree->rf_ci,
3879 ref_root_bh,
3880 &dealloc);
3881 if (ret) {
3882 mlog_errno(ret);
3883 goto unlock;
3884 }
3885 }
3886
Tao Maa9063ab2009-08-18 11:40:59 +08003887 if (data_changed) {
3888 ret = ocfs2_change_ctime(inode, di_bh);
3889 if (ret)
3890 mlog_errno(ret);
3891 }
3892
3893unlock:
Tao Ma110a0452009-08-22 23:54:27 +08003894 ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
3895 brelse(ref_root_bh);
3896
3897 if (!ret && ocfs2_dealloc_has_cluster(&dealloc)) {
3898 ocfs2_schedule_truncate_log_flush(osb, 1);
3899 ocfs2_run_deallocs(osb, &dealloc);
3900 }
3901out:
3902 /*
3903 * Empty the extent map so that we may get the right extent
3904 * record from the disk.
3905 */
3906 ocfs2_extent_map_trunc(inode, 0);
3907
3908 return ret;
3909}
3910
3911static int ocfs2_add_refcounted_extent(struct inode *inode,
3912 struct ocfs2_extent_tree *et,
3913 struct ocfs2_caching_info *ref_ci,
3914 struct buffer_head *ref_root_bh,
3915 u32 cpos, u32 p_cluster, u32 num_clusters,
3916 unsigned int ext_flags,
3917 struct ocfs2_cached_dealloc_ctxt *dealloc)
3918{
3919 int ret;
3920 handle_t *handle;
3921 int credits = 0;
3922 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3923 struct ocfs2_alloc_context *meta_ac = NULL;
3924
3925 ret = ocfs2_lock_refcount_allocators(inode->i_sb,
3926 p_cluster, num_clusters,
3927 et, ref_ci,
3928 ref_root_bh, &meta_ac,
3929 NULL, &credits);
3930 if (ret) {
3931 mlog_errno(ret);
3932 goto out;
3933 }
3934
3935 handle = ocfs2_start_trans(osb, credits);
3936 if (IS_ERR(handle)) {
3937 ret = PTR_ERR(handle);
3938 mlog_errno(ret);
3939 goto out;
3940 }
3941
3942 ret = ocfs2_insert_extent(handle, et, cpos,
Tao Ma12d4cec2009-11-30 15:08:40 +08003943 ocfs2_clusters_to_blocks(inode->i_sb, p_cluster),
Tao Ma110a0452009-08-22 23:54:27 +08003944 num_clusters, ext_flags, meta_ac);
3945 if (ret) {
3946 mlog_errno(ret);
3947 goto out_commit;
3948 }
3949
Tao Ma2999d122009-08-18 11:43:55 +08003950 ret = ocfs2_increase_refcount(handle, ref_ci, ref_root_bh,
3951 p_cluster, num_clusters,
3952 meta_ac, dealloc);
Tao Ma110a0452009-08-22 23:54:27 +08003953 if (ret)
3954 mlog_errno(ret);
3955
3956out_commit:
3957 ocfs2_commit_trans(osb, handle);
3958out:
3959 if (meta_ac)
3960 ocfs2_free_alloc_context(meta_ac);
3961 return ret;
3962}
3963
Tao Ma2f48d592009-10-15 11:10:49 +08003964static int ocfs2_duplicate_inline_data(struct inode *s_inode,
3965 struct buffer_head *s_bh,
3966 struct inode *t_inode,
3967 struct buffer_head *t_bh)
3968{
3969 int ret;
3970 handle_t *handle;
3971 struct ocfs2_super *osb = OCFS2_SB(s_inode->i_sb);
3972 struct ocfs2_dinode *s_di = (struct ocfs2_dinode *)s_bh->b_data;
3973 struct ocfs2_dinode *t_di = (struct ocfs2_dinode *)t_bh->b_data;
3974
3975 BUG_ON(!(OCFS2_I(s_inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL));
3976
3977 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
3978 if (IS_ERR(handle)) {
3979 ret = PTR_ERR(handle);
3980 mlog_errno(ret);
3981 goto out;
3982 }
3983
3984 ret = ocfs2_journal_access_di(handle, INODE_CACHE(t_inode), t_bh,
3985 OCFS2_JOURNAL_ACCESS_WRITE);
3986 if (ret) {
3987 mlog_errno(ret);
3988 goto out_commit;
3989 }
3990
3991 t_di->id2.i_data.id_count = s_di->id2.i_data.id_count;
3992 memcpy(t_di->id2.i_data.id_data, s_di->id2.i_data.id_data,
3993 le16_to_cpu(s_di->id2.i_data.id_count));
3994 spin_lock(&OCFS2_I(t_inode)->ip_lock);
3995 OCFS2_I(t_inode)->ip_dyn_features |= OCFS2_INLINE_DATA_FL;
3996 t_di->i_dyn_features = cpu_to_le16(OCFS2_I(t_inode)->ip_dyn_features);
3997 spin_unlock(&OCFS2_I(t_inode)->ip_lock);
3998
3999 ocfs2_journal_dirty(handle, t_bh);
4000
4001out_commit:
4002 ocfs2_commit_trans(osb, handle);
4003out:
4004 return ret;
4005}
4006
Tao Ma110a0452009-08-22 23:54:27 +08004007static int ocfs2_duplicate_extent_list(struct inode *s_inode,
4008 struct inode *t_inode,
4009 struct buffer_head *t_bh,
4010 struct ocfs2_caching_info *ref_ci,
4011 struct buffer_head *ref_root_bh,
4012 struct ocfs2_cached_dealloc_ctxt *dealloc)
4013{
4014 int ret = 0;
4015 u32 p_cluster, num_clusters, clusters, cpos;
4016 loff_t size;
4017 unsigned int ext_flags;
4018 struct ocfs2_extent_tree et;
4019
4020 ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(t_inode), t_bh);
4021
4022 size = i_size_read(s_inode);
4023 clusters = ocfs2_clusters_for_bytes(s_inode->i_sb, size);
4024
4025 cpos = 0;
4026 while (cpos < clusters) {
4027 ret = ocfs2_get_clusters(s_inode, cpos, &p_cluster,
4028 &num_clusters, &ext_flags);
Joseph Qi2b0f6ea2013-09-11 14:19:52 -07004029 if (ret) {
4030 mlog_errno(ret);
4031 goto out;
4032 }
Tao Ma110a0452009-08-22 23:54:27 +08004033 if (p_cluster) {
4034 ret = ocfs2_add_refcounted_extent(t_inode, &et,
4035 ref_ci, ref_root_bh,
4036 cpos, p_cluster,
4037 num_clusters,
4038 ext_flags,
4039 dealloc);
4040 if (ret) {
4041 mlog_errno(ret);
4042 goto out;
4043 }
4044 }
4045
4046 cpos += num_clusters;
4047 }
4048
4049out:
4050 return ret;
4051}
4052
Tao Maa9063ab2009-08-18 11:40:59 +08004053/*
4054 * change the new file's attributes to the src.
4055 *
4056 * reflink creates a snapshot of a file, that means the attributes
4057 * must be identical except for three exceptions - nlink, ino, and ctime.
4058 */
4059static int ocfs2_complete_reflink(struct inode *s_inode,
4060 struct buffer_head *s_bh,
4061 struct inode *t_inode,
Tao Ma0fe9b662009-08-18 11:47:56 +08004062 struct buffer_head *t_bh,
4063 bool preserve)
Tao Maa9063ab2009-08-18 11:40:59 +08004064{
4065 int ret;
4066 handle_t *handle;
4067 struct ocfs2_dinode *s_di = (struct ocfs2_dinode *)s_bh->b_data;
4068 struct ocfs2_dinode *di = (struct ocfs2_dinode *)t_bh->b_data;
4069 loff_t size = i_size_read(s_inode);
4070
4071 handle = ocfs2_start_trans(OCFS2_SB(t_inode->i_sb),
4072 OCFS2_INODE_UPDATE_CREDITS);
4073 if (IS_ERR(handle)) {
4074 ret = PTR_ERR(handle);
4075 mlog_errno(ret);
4076 return ret;
4077 }
4078
4079 ret = ocfs2_journal_access_di(handle, INODE_CACHE(t_inode), t_bh,
4080 OCFS2_JOURNAL_ACCESS_WRITE);
4081 if (ret) {
4082 mlog_errno(ret);
4083 goto out_commit;
4084 }
4085
4086 spin_lock(&OCFS2_I(t_inode)->ip_lock);
4087 OCFS2_I(t_inode)->ip_clusters = OCFS2_I(s_inode)->ip_clusters;
4088 OCFS2_I(t_inode)->ip_attr = OCFS2_I(s_inode)->ip_attr;
4089 OCFS2_I(t_inode)->ip_dyn_features = OCFS2_I(s_inode)->ip_dyn_features;
4090 spin_unlock(&OCFS2_I(t_inode)->ip_lock);
4091 i_size_write(t_inode, size);
Tao Ma6527f8f2010-03-10 09:56:52 +08004092 t_inode->i_blocks = s_inode->i_blocks;
Tao Maa9063ab2009-08-18 11:40:59 +08004093
4094 di->i_xattr_inline_size = s_di->i_xattr_inline_size;
4095 di->i_clusters = s_di->i_clusters;
4096 di->i_size = s_di->i_size;
4097 di->i_dyn_features = s_di->i_dyn_features;
4098 di->i_attr = s_di->i_attr;
Tao Maa9063ab2009-08-18 11:40:59 +08004099
Tao Ma0fe9b662009-08-18 11:47:56 +08004100 if (preserve) {
Tao Mac21a5342010-04-21 14:05:55 +08004101 t_inode->i_uid = s_inode->i_uid;
4102 t_inode->i_gid = s_inode->i_gid;
4103 t_inode->i_mode = s_inode->i_mode;
Tao Ma0fe9b662009-08-18 11:47:56 +08004104 di->i_uid = s_di->i_uid;
4105 di->i_gid = s_di->i_gid;
4106 di->i_mode = s_di->i_mode;
Tao Maa9063ab2009-08-18 11:40:59 +08004107
Tao Ma0fe9b662009-08-18 11:47:56 +08004108 /*
4109 * update time.
4110 * we want mtime to appear identical to the source and
4111 * update ctime.
4112 */
4113 t_inode->i_ctime = CURRENT_TIME;
Tao Maa9063ab2009-08-18 11:40:59 +08004114
Tao Ma0fe9b662009-08-18 11:47:56 +08004115 di->i_ctime = cpu_to_le64(t_inode->i_ctime.tv_sec);
4116 di->i_ctime_nsec = cpu_to_le32(t_inode->i_ctime.tv_nsec);
4117
4118 t_inode->i_mtime = s_inode->i_mtime;
4119 di->i_mtime = s_di->i_mtime;
4120 di->i_mtime_nsec = s_di->i_mtime_nsec;
4121 }
Tao Maa9063ab2009-08-18 11:40:59 +08004122
4123 ocfs2_journal_dirty(handle, t_bh);
4124
4125out_commit:
4126 ocfs2_commit_trans(OCFS2_SB(t_inode->i_sb), handle);
4127 return ret;
4128}
4129
Tao Ma110a0452009-08-22 23:54:27 +08004130static int ocfs2_create_reflink_node(struct inode *s_inode,
4131 struct buffer_head *s_bh,
4132 struct inode *t_inode,
Tao Ma0fe9b662009-08-18 11:47:56 +08004133 struct buffer_head *t_bh,
4134 bool preserve)
Tao Ma110a0452009-08-22 23:54:27 +08004135{
4136 int ret;
4137 struct buffer_head *ref_root_bh = NULL;
4138 struct ocfs2_cached_dealloc_ctxt dealloc;
4139 struct ocfs2_super *osb = OCFS2_SB(s_inode->i_sb);
4140 struct ocfs2_refcount_block *rb;
4141 struct ocfs2_dinode *di = (struct ocfs2_dinode *)s_bh->b_data;
4142 struct ocfs2_refcount_tree *ref_tree;
4143
4144 ocfs2_init_dealloc_ctxt(&dealloc);
4145
4146 ret = ocfs2_set_refcount_tree(t_inode, t_bh,
4147 le64_to_cpu(di->i_refcount_loc));
4148 if (ret) {
4149 mlog_errno(ret);
4150 goto out;
4151 }
4152
Tao Ma2f48d592009-10-15 11:10:49 +08004153 if (OCFS2_I(s_inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
4154 ret = ocfs2_duplicate_inline_data(s_inode, s_bh,
4155 t_inode, t_bh);
4156 if (ret)
4157 mlog_errno(ret);
4158 goto out;
4159 }
4160
Tao Ma110a0452009-08-22 23:54:27 +08004161 ret = ocfs2_lock_refcount_tree(osb, le64_to_cpu(di->i_refcount_loc),
4162 1, &ref_tree, &ref_root_bh);
4163 if (ret) {
4164 mlog_errno(ret);
4165 goto out;
4166 }
4167 rb = (struct ocfs2_refcount_block *)ref_root_bh->b_data;
4168
4169 ret = ocfs2_duplicate_extent_list(s_inode, t_inode, t_bh,
4170 &ref_tree->rf_ci, ref_root_bh,
4171 &dealloc);
Tao Maa9063ab2009-08-18 11:40:59 +08004172 if (ret) {
4173 mlog_errno(ret);
4174 goto out_unlock_refcount;
4175 }
4176
Tao Maa9063ab2009-08-18 11:40:59 +08004177out_unlock_refcount:
Tao Ma110a0452009-08-22 23:54:27 +08004178 ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
4179 brelse(ref_root_bh);
4180out:
4181 if (ocfs2_dealloc_has_cluster(&dealloc)) {
4182 ocfs2_schedule_truncate_log_flush(osb, 1);
4183 ocfs2_run_deallocs(osb, &dealloc);
4184 }
4185
4186 return ret;
4187}
Tao Ma09bf27a2009-09-21 10:38:17 +08004188
4189static int __ocfs2_reflink(struct dentry *old_dentry,
4190 struct buffer_head *old_bh,
4191 struct inode *new_inode,
4192 bool preserve)
4193{
4194 int ret;
David Howells2b0143b2015-03-17 22:25:59 +00004195 struct inode *inode = d_inode(old_dentry);
Tao Ma09bf27a2009-09-21 10:38:17 +08004196 struct buffer_head *new_bh = NULL;
4197
Joel Becker56934862010-07-01 15:13:31 -07004198 if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_SYSTEM_FILE) {
4199 ret = -EINVAL;
4200 mlog_errno(ret);
4201 goto out;
4202 }
4203
Tao Ma09bf27a2009-09-21 10:38:17 +08004204 ret = filemap_fdatawrite(inode->i_mapping);
4205 if (ret) {
4206 mlog_errno(ret);
4207 goto out;
4208 }
4209
4210 ret = ocfs2_attach_refcount_tree(inode, old_bh);
4211 if (ret) {
4212 mlog_errno(ret);
4213 goto out;
4214 }
4215
Tao Ma07eaac92010-09-07 13:30:06 +08004216 mutex_lock_nested(&new_inode->i_mutex, I_MUTEX_CHILD);
4217 ret = ocfs2_inode_lock_nested(new_inode, &new_bh, 1,
4218 OI_LS_REFLINK_TARGET);
Tao Ma09bf27a2009-09-21 10:38:17 +08004219 if (ret) {
4220 mlog_errno(ret);
4221 goto out_unlock;
4222 }
4223
4224 ret = ocfs2_create_reflink_node(inode, old_bh,
4225 new_inode, new_bh, preserve);
4226 if (ret) {
4227 mlog_errno(ret);
4228 goto inode_unlock;
4229 }
4230
4231 if (OCFS2_I(inode)->ip_dyn_features & OCFS2_HAS_XATTR_FL) {
4232 ret = ocfs2_reflink_xattrs(inode, old_bh,
4233 new_inode, new_bh,
4234 preserve);
Tao Ma87f4b1b2009-10-15 11:10:48 +08004235 if (ret) {
Tao Ma09bf27a2009-09-21 10:38:17 +08004236 mlog_errno(ret);
Tao Ma87f4b1b2009-10-15 11:10:48 +08004237 goto inode_unlock;
4238 }
Tao Ma09bf27a2009-09-21 10:38:17 +08004239 }
Tao Ma87f4b1b2009-10-15 11:10:48 +08004240
4241 ret = ocfs2_complete_reflink(inode, old_bh,
4242 new_inode, new_bh, preserve);
4243 if (ret)
4244 mlog_errno(ret);
4245
Tao Ma09bf27a2009-09-21 10:38:17 +08004246inode_unlock:
4247 ocfs2_inode_unlock(new_inode, 1);
4248 brelse(new_bh);
4249out_unlock:
4250 mutex_unlock(&new_inode->i_mutex);
4251out:
4252 if (!ret) {
4253 ret = filemap_fdatawait(inode->i_mapping);
4254 if (ret)
4255 mlog_errno(ret);
4256 }
4257 return ret;
4258}
4259
4260static int ocfs2_reflink(struct dentry *old_dentry, struct inode *dir,
4261 struct dentry *new_dentry, bool preserve)
4262{
4263 int error;
David Howells2b0143b2015-03-17 22:25:59 +00004264 struct inode *inode = d_inode(old_dentry);
Tao Ma09bf27a2009-09-21 10:38:17 +08004265 struct buffer_head *old_bh = NULL;
4266 struct inode *new_orphan_inode = NULL;
Christoph Hellwig702e5bc2013-12-20 05:16:48 -08004267 struct posix_acl *default_acl, *acl;
4268 umode_t mode;
Tao Ma09bf27a2009-09-21 10:38:17 +08004269
4270 if (!ocfs2_refcount_tree(OCFS2_SB(inode->i_sb)))
4271 return -EOPNOTSUPP;
4272
Christoph Hellwig702e5bc2013-12-20 05:16:48 -08004273 mode = inode->i_mode;
4274 error = posix_acl_create(dir, &mode, &default_acl, &acl);
4275 if (error) {
4276 mlog_errno(error);
Dan Carpentere073fc52015-04-14 15:43:19 -07004277 return error;
Christoph Hellwig702e5bc2013-12-20 05:16:48 -08004278 }
4279
4280 error = ocfs2_create_inode_in_orphan(dir, mode,
Tao Ma09bf27a2009-09-21 10:38:17 +08004281 &new_orphan_inode);
4282 if (error) {
4283 mlog_errno(error);
4284 goto out;
4285 }
4286
Wengang Wang8a8ad1c2014-06-23 13:22:08 -07004287 error = ocfs2_rw_lock(inode, 1);
4288 if (error) {
4289 mlog_errno(error);
4290 goto out;
4291 }
4292
Tao Ma09bf27a2009-09-21 10:38:17 +08004293 error = ocfs2_inode_lock(inode, &old_bh, 1);
4294 if (error) {
4295 mlog_errno(error);
Wengang Wang8a8ad1c2014-06-23 13:22:08 -07004296 ocfs2_rw_unlock(inode, 1);
Tao Ma09bf27a2009-09-21 10:38:17 +08004297 goto out;
4298 }
4299
4300 down_write(&OCFS2_I(inode)->ip_xattr_sem);
4301 down_write(&OCFS2_I(inode)->ip_alloc_sem);
4302 error = __ocfs2_reflink(old_dentry, old_bh,
4303 new_orphan_inode, preserve);
4304 up_write(&OCFS2_I(inode)->ip_alloc_sem);
4305 up_write(&OCFS2_I(inode)->ip_xattr_sem);
4306
4307 ocfs2_inode_unlock(inode, 1);
Wengang Wang8a8ad1c2014-06-23 13:22:08 -07004308 ocfs2_rw_unlock(inode, 1);
Tao Ma09bf27a2009-09-21 10:38:17 +08004309 brelse(old_bh);
4310
4311 if (error) {
4312 mlog_errno(error);
4313 goto out;
4314 }
4315
4316 /* If the security isn't preserved, we need to re-initialize them. */
4317 if (!preserve) {
Eric Paris2a7dba32011-02-01 11:05:39 -05004318 error = ocfs2_init_security_and_acl(dir, new_orphan_inode,
Christoph Hellwig702e5bc2013-12-20 05:16:48 -08004319 &new_dentry->d_name,
4320 default_acl, acl);
Tao Ma09bf27a2009-09-21 10:38:17 +08004321 if (error)
4322 mlog_errno(error);
4323 }
4324out:
Christoph Hellwig702e5bc2013-12-20 05:16:48 -08004325 if (default_acl)
4326 posix_acl_release(default_acl);
4327 if (acl)
4328 posix_acl_release(acl);
Tao Ma09bf27a2009-09-21 10:38:17 +08004329 if (!error) {
4330 error = ocfs2_mv_orphaned_inode_to_new(dir, new_orphan_inode,
4331 new_dentry);
4332 if (error)
4333 mlog_errno(error);
4334 }
4335
4336 if (new_orphan_inode) {
4337 /*
4338 * We need to open_unlock the inode no matter whether we
4339 * succeed or not, so that other nodes can delete it later.
4340 */
4341 ocfs2_open_unlock(new_orphan_inode);
4342 if (error)
4343 iput(new_orphan_inode);
4344 }
4345
4346 return error;
4347}
Tao Mabd508732009-09-21 11:25:14 +08004348
4349/*
4350 * Below here are the bits used by OCFS2_IOC_REFLINK() to fake
4351 * sys_reflink(). This will go away when vfs_reflink() exists in
4352 * fs/namei.c.
4353 */
4354
4355/* copied from may_create in VFS. */
4356static inline int ocfs2_may_create(struct inode *dir, struct dentry *child)
4357{
David Howells2b0143b2015-03-17 22:25:59 +00004358 if (d_really_is_positive(child))
Tao Mabd508732009-09-21 11:25:14 +08004359 return -EEXIST;
4360 if (IS_DEADDIR(dir))
4361 return -ENOENT;
4362 return inode_permission(dir, MAY_WRITE | MAY_EXEC);
4363}
4364
Tao Mabd508732009-09-21 11:25:14 +08004365/**
4366 * ocfs2_vfs_reflink - Create a reference-counted link
4367 *
4368 * @old_dentry: source dentry + inode
4369 * @dir: directory to create the target
4370 * @new_dentry: target dentry
4371 * @preserve: if true, preserve all file attributes
4372 */
Tao Ma12d4cec2009-11-30 15:08:40 +08004373static int ocfs2_vfs_reflink(struct dentry *old_dentry, struct inode *dir,
4374 struct dentry *new_dentry, bool preserve)
Tao Mabd508732009-09-21 11:25:14 +08004375{
David Howells2b0143b2015-03-17 22:25:59 +00004376 struct inode *inode = d_inode(old_dentry);
Tao Mabd508732009-09-21 11:25:14 +08004377 int error;
4378
4379 if (!inode)
4380 return -ENOENT;
4381
4382 error = ocfs2_may_create(dir, new_dentry);
4383 if (error)
4384 return error;
4385
4386 if (dir->i_sb != inode->i_sb)
4387 return -EXDEV;
4388
4389 /*
4390 * A reflink to an append-only or immutable file cannot be created.
4391 */
4392 if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
4393 return -EPERM;
4394
4395 /* Only regular files can be reflinked. */
4396 if (!S_ISREG(inode->i_mode))
4397 return -EPERM;
4398
4399 /*
4400 * If the caller wants to preserve ownership, they require the
4401 * rights to do so.
4402 */
4403 if (preserve) {
Eric W. Biederman488c8ef2013-01-31 17:35:29 -08004404 if (!uid_eq(current_fsuid(), inode->i_uid) && !capable(CAP_CHOWN))
Tao Mabd508732009-09-21 11:25:14 +08004405 return -EPERM;
4406 if (!in_group_p(inode->i_gid) && !capable(CAP_CHOWN))
4407 return -EPERM;
4408 }
4409
4410 /*
4411 * If the caller is modifying any aspect of the attributes, they
4412 * are not creating a snapshot. They need read permission on the
4413 * file.
4414 */
4415 if (!preserve) {
4416 error = inode_permission(inode, MAY_READ);
4417 if (error)
4418 return error;
4419 }
4420
4421 mutex_lock(&inode->i_mutex);
Christoph Hellwig871a2932010-03-03 09:05:07 -05004422 dquot_initialize(dir);
Tao Mabd508732009-09-21 11:25:14 +08004423 error = ocfs2_reflink(old_dentry, dir, new_dentry, preserve);
4424 mutex_unlock(&inode->i_mutex);
4425 if (!error)
4426 fsnotify_create(dir, new_dentry);
4427 return error;
4428}
4429/*
4430 * Most codes are copied from sys_linkat.
4431 */
4432int ocfs2_reflink_ioctl(struct inode *inode,
4433 const char __user *oldname,
4434 const char __user *newname,
4435 bool preserve)
4436{
4437 struct dentry *new_dentry;
Al Virodae6ad82011-06-26 11:50:15 -04004438 struct path old_path, new_path;
Tao Mabd508732009-09-21 11:25:14 +08004439 int error;
Tao Mabd508732009-09-21 11:25:14 +08004440
4441 if (!ocfs2_refcount_tree(OCFS2_SB(inode->i_sb)))
4442 return -EOPNOTSUPP;
4443
4444 error = user_path_at(AT_FDCWD, oldname, 0, &old_path);
4445 if (error) {
4446 mlog_errno(error);
4447 return error;
4448 }
4449
Al Virodae6ad82011-06-26 11:50:15 -04004450 new_dentry = user_path_create(AT_FDCWD, newname, &new_path, 0);
4451 error = PTR_ERR(new_dentry);
4452 if (IS_ERR(new_dentry)) {
Tao Mabd508732009-09-21 11:25:14 +08004453 mlog_errno(error);
4454 goto out;
4455 }
4456
4457 error = -EXDEV;
Al Virodae6ad82011-06-26 11:50:15 -04004458 if (old_path.mnt != new_path.mnt) {
Tao Mabd508732009-09-21 11:25:14 +08004459 mlog_errno(error);
Al Virodae6ad82011-06-26 11:50:15 -04004460 goto out_dput;
Tao Mabd508732009-09-21 11:25:14 +08004461 }
4462
Tao Mabd508732009-09-21 11:25:14 +08004463 error = ocfs2_vfs_reflink(old_path.dentry,
David Howells2b0143b2015-03-17 22:25:59 +00004464 d_inode(new_path.dentry),
Tao Mabd508732009-09-21 11:25:14 +08004465 new_dentry, preserve);
Tao Mabd508732009-09-21 11:25:14 +08004466out_dput:
Al Viro921a1652012-07-20 01:15:31 +04004467 done_path_create(&new_path, new_dentry);
Tao Mabd508732009-09-21 11:25:14 +08004468out:
4469 path_put(&old_path);
4470
4471 return error;
4472}