blob: bf4dfc14bb2c7cca75b618de73bfcaf656103ff2 [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>
Tao Ma6f70fa52009-08-25 08:05:12 +080049
50struct ocfs2_cow_context {
51 struct inode *inode;
52 u32 cow_start;
53 u32 cow_len;
Tao Ma913580b2009-08-24 14:31:03 +080054 struct ocfs2_extent_tree data_et;
55 struct ocfs2_refcount_tree *ref_tree;
Tao Ma6f70fa52009-08-25 08:05:12 +080056 struct buffer_head *ref_root_bh;
57 struct ocfs2_alloc_context *meta_ac;
58 struct ocfs2_alloc_context *data_ac;
59 struct ocfs2_cached_dealloc_ctxt dealloc;
Tao Ma492a8a32009-08-18 11:43:17 +080060 void *cow_object;
61 struct ocfs2_post_refcount *post_refcount;
62 int extra_credits;
Tao Ma913580b2009-08-24 14:31:03 +080063 int (*get_clusters)(struct ocfs2_cow_context *context,
64 u32 v_cluster, u32 *p_cluster,
65 u32 *num_clusters,
66 unsigned int *extent_flags);
67 int (*cow_duplicate_clusters)(handle_t *handle,
Tiger Yangc7dd3392013-08-13 16:00:58 -070068 struct inode *inode,
Tao Ma913580b2009-08-24 14:31:03 +080069 u32 cpos, u32 old_cluster,
70 u32 new_cluster, u32 new_len);
Tao Ma6f70fa52009-08-25 08:05:12 +080071};
Tao Mac732eb12009-08-18 11:21:00 +080072
73static inline struct ocfs2_refcount_tree *
74cache_info_to_refcount(struct ocfs2_caching_info *ci)
75{
76 return container_of(ci, struct ocfs2_refcount_tree, rf_ci);
77}
Tao Maf2c870e2009-08-18 11:19:26 +080078
79static int ocfs2_validate_refcount_block(struct super_block *sb,
80 struct buffer_head *bh)
81{
82 int rc;
83 struct ocfs2_refcount_block *rb =
84 (struct ocfs2_refcount_block *)bh->b_data;
85
Tao Ma198aac22011-02-22 08:20:04 +080086 trace_ocfs2_validate_refcount_block((unsigned long long)bh->b_blocknr);
Tao Maf2c870e2009-08-18 11:19:26 +080087
88 BUG_ON(!buffer_uptodate(bh));
89
90 /*
91 * If the ecc fails, we return the error but otherwise
92 * leave the filesystem running. We know any error is
93 * local to this block.
94 */
95 rc = ocfs2_validate_meta_ecc(sb, bh->b_data, &rb->rf_check);
96 if (rc) {
97 mlog(ML_ERROR, "Checksum failed for refcount block %llu\n",
98 (unsigned long long)bh->b_blocknr);
99 return rc;
100 }
101
102
103 if (!OCFS2_IS_VALID_REFCOUNT_BLOCK(rb)) {
104 ocfs2_error(sb,
105 "Refcount block #%llu has bad signature %.*s",
106 (unsigned long long)bh->b_blocknr, 7,
107 rb->rf_signature);
108 return -EINVAL;
109 }
110
111 if (le64_to_cpu(rb->rf_blkno) != bh->b_blocknr) {
112 ocfs2_error(sb,
113 "Refcount block #%llu has an invalid rf_blkno "
114 "of %llu",
115 (unsigned long long)bh->b_blocknr,
116 (unsigned long long)le64_to_cpu(rb->rf_blkno));
117 return -EINVAL;
118 }
119
120 if (le32_to_cpu(rb->rf_fs_generation) != OCFS2_SB(sb)->fs_generation) {
121 ocfs2_error(sb,
122 "Refcount block #%llu has an invalid "
123 "rf_fs_generation of #%u",
124 (unsigned long long)bh->b_blocknr,
125 le32_to_cpu(rb->rf_fs_generation));
126 return -EINVAL;
127 }
128
129 return 0;
130}
131
132static int ocfs2_read_refcount_block(struct ocfs2_caching_info *ci,
133 u64 rb_blkno,
134 struct buffer_head **bh)
135{
136 int rc;
137 struct buffer_head *tmp = *bh;
138
139 rc = ocfs2_read_block(ci, rb_blkno, &tmp,
140 ocfs2_validate_refcount_block);
141
142 /* If ocfs2_read_block() got us a new bh, pass it up. */
143 if (!rc && !*bh)
144 *bh = tmp;
145
146 return rc;
147}
Tao Mac732eb12009-08-18 11:21:00 +0800148
149static u64 ocfs2_refcount_cache_owner(struct ocfs2_caching_info *ci)
150{
151 struct ocfs2_refcount_tree *rf = cache_info_to_refcount(ci);
152
153 return rf->rf_blkno;
154}
155
156static struct super_block *
157ocfs2_refcount_cache_get_super(struct ocfs2_caching_info *ci)
158{
159 struct ocfs2_refcount_tree *rf = cache_info_to_refcount(ci);
160
161 return rf->rf_sb;
162}
163
164static void ocfs2_refcount_cache_lock(struct ocfs2_caching_info *ci)
165{
166 struct ocfs2_refcount_tree *rf = cache_info_to_refcount(ci);
167
168 spin_lock(&rf->rf_lock);
169}
170
171static void ocfs2_refcount_cache_unlock(struct ocfs2_caching_info *ci)
172{
173 struct ocfs2_refcount_tree *rf = cache_info_to_refcount(ci);
174
175 spin_unlock(&rf->rf_lock);
176}
177
178static void ocfs2_refcount_cache_io_lock(struct ocfs2_caching_info *ci)
179{
180 struct ocfs2_refcount_tree *rf = cache_info_to_refcount(ci);
181
182 mutex_lock(&rf->rf_io_mutex);
183}
184
185static void ocfs2_refcount_cache_io_unlock(struct ocfs2_caching_info *ci)
186{
187 struct ocfs2_refcount_tree *rf = cache_info_to_refcount(ci);
188
189 mutex_unlock(&rf->rf_io_mutex);
190}
191
192static const struct ocfs2_caching_operations ocfs2_refcount_caching_ops = {
193 .co_owner = ocfs2_refcount_cache_owner,
194 .co_get_super = ocfs2_refcount_cache_get_super,
195 .co_cache_lock = ocfs2_refcount_cache_lock,
196 .co_cache_unlock = ocfs2_refcount_cache_unlock,
197 .co_io_lock = ocfs2_refcount_cache_io_lock,
198 .co_io_unlock = ocfs2_refcount_cache_io_unlock,
199};
Tao Ma374a2632009-08-24 11:13:37 +0800200
201static struct ocfs2_refcount_tree *
202ocfs2_find_refcount_tree(struct ocfs2_super *osb, u64 blkno)
203{
204 struct rb_node *n = osb->osb_rf_lock_tree.rb_node;
205 struct ocfs2_refcount_tree *tree = NULL;
206
207 while (n) {
208 tree = rb_entry(n, struct ocfs2_refcount_tree, rf_node);
209
210 if (blkno < tree->rf_blkno)
211 n = n->rb_left;
212 else if (blkno > tree->rf_blkno)
213 n = n->rb_right;
214 else
215 return tree;
216 }
217
218 return NULL;
219}
220
221/* osb_lock is already locked. */
222static void ocfs2_insert_refcount_tree(struct ocfs2_super *osb,
223 struct ocfs2_refcount_tree *new)
224{
225 u64 rf_blkno = new->rf_blkno;
226 struct rb_node *parent = NULL;
227 struct rb_node **p = &osb->osb_rf_lock_tree.rb_node;
228 struct ocfs2_refcount_tree *tmp;
229
230 while (*p) {
231 parent = *p;
232
233 tmp = rb_entry(parent, struct ocfs2_refcount_tree,
234 rf_node);
235
236 if (rf_blkno < tmp->rf_blkno)
237 p = &(*p)->rb_left;
238 else if (rf_blkno > tmp->rf_blkno)
239 p = &(*p)->rb_right;
240 else {
241 /* This should never happen! */
242 mlog(ML_ERROR, "Duplicate refcount block %llu found!\n",
243 (unsigned long long)rf_blkno);
244 BUG();
245 }
246 }
247
248 rb_link_node(&new->rf_node, parent, p);
249 rb_insert_color(&new->rf_node, &osb->osb_rf_lock_tree);
250}
251
252static void ocfs2_free_refcount_tree(struct ocfs2_refcount_tree *tree)
253{
254 ocfs2_metadata_cache_exit(&tree->rf_ci);
255 ocfs2_simple_drop_lockres(OCFS2_SB(tree->rf_sb), &tree->rf_lockres);
256 ocfs2_lock_res_free(&tree->rf_lockres);
257 kfree(tree);
258}
259
260static inline void
261ocfs2_erase_refcount_tree_from_list_no_lock(struct ocfs2_super *osb,
262 struct ocfs2_refcount_tree *tree)
263{
264 rb_erase(&tree->rf_node, &osb->osb_rf_lock_tree);
265 if (osb->osb_ref_tree_lru && osb->osb_ref_tree_lru == tree)
266 osb->osb_ref_tree_lru = NULL;
267}
268
269static void ocfs2_erase_refcount_tree_from_list(struct ocfs2_super *osb,
270 struct ocfs2_refcount_tree *tree)
271{
272 spin_lock(&osb->osb_lock);
273 ocfs2_erase_refcount_tree_from_list_no_lock(osb, tree);
274 spin_unlock(&osb->osb_lock);
275}
276
Tao Ma12d4cec2009-11-30 15:08:40 +0800277static void ocfs2_kref_remove_refcount_tree(struct kref *kref)
Tao Ma374a2632009-08-24 11:13:37 +0800278{
279 struct ocfs2_refcount_tree *tree =
280 container_of(kref, struct ocfs2_refcount_tree, rf_getcnt);
281
282 ocfs2_free_refcount_tree(tree);
283}
284
285static inline void
286ocfs2_refcount_tree_get(struct ocfs2_refcount_tree *tree)
287{
288 kref_get(&tree->rf_getcnt);
289}
290
291static inline void
292ocfs2_refcount_tree_put(struct ocfs2_refcount_tree *tree)
293{
294 kref_put(&tree->rf_getcnt, ocfs2_kref_remove_refcount_tree);
295}
296
297static inline void ocfs2_init_refcount_tree_ci(struct ocfs2_refcount_tree *new,
298 struct super_block *sb)
299{
300 ocfs2_metadata_cache_init(&new->rf_ci, &ocfs2_refcount_caching_ops);
301 mutex_init(&new->rf_io_mutex);
302 new->rf_sb = sb;
303 spin_lock_init(&new->rf_lock);
304}
305
306static inline void ocfs2_init_refcount_tree_lock(struct ocfs2_super *osb,
307 struct ocfs2_refcount_tree *new,
308 u64 rf_blkno, u32 generation)
309{
310 init_rwsem(&new->rf_sem);
311 ocfs2_refcount_lock_res_init(&new->rf_lockres, osb,
312 rf_blkno, generation);
313}
314
Tao Ma8bf396d2009-08-24 11:12:02 +0800315static struct ocfs2_refcount_tree*
316ocfs2_allocate_refcount_tree(struct ocfs2_super *osb, u64 rf_blkno)
317{
318 struct ocfs2_refcount_tree *new;
319
320 new = kzalloc(sizeof(struct ocfs2_refcount_tree), GFP_NOFS);
321 if (!new)
322 return NULL;
323
324 new->rf_blkno = rf_blkno;
325 kref_init(&new->rf_getcnt);
326 ocfs2_init_refcount_tree_ci(new, osb->sb);
327
328 return new;
329}
330
Tao Ma374a2632009-08-24 11:13:37 +0800331static int ocfs2_get_refcount_tree(struct ocfs2_super *osb, u64 rf_blkno,
332 struct ocfs2_refcount_tree **ret_tree)
333{
334 int ret = 0;
335 struct ocfs2_refcount_tree *tree, *new = NULL;
336 struct buffer_head *ref_root_bh = NULL;
337 struct ocfs2_refcount_block *ref_rb;
338
339 spin_lock(&osb->osb_lock);
340 if (osb->osb_ref_tree_lru &&
341 osb->osb_ref_tree_lru->rf_blkno == rf_blkno)
342 tree = osb->osb_ref_tree_lru;
343 else
344 tree = ocfs2_find_refcount_tree(osb, rf_blkno);
345 if (tree)
346 goto out;
347
348 spin_unlock(&osb->osb_lock);
349
Tao Ma8bf396d2009-08-24 11:12:02 +0800350 new = ocfs2_allocate_refcount_tree(osb, rf_blkno);
Tao Ma374a2632009-08-24 11:13:37 +0800351 if (!new) {
352 ret = -ENOMEM;
Tao Ma8bf396d2009-08-24 11:12:02 +0800353 mlog_errno(ret);
Tao Ma374a2632009-08-24 11:13:37 +0800354 return ret;
355 }
Tao Ma374a2632009-08-24 11:13:37 +0800356 /*
357 * We need the generation to create the refcount tree lock and since
358 * it isn't changed during the tree modification, we are safe here to
359 * read without protection.
360 * We also have to purge the cache after we create the lock since the
361 * refcount block may have the stale data. It can only be trusted when
362 * we hold the refcount lock.
363 */
364 ret = ocfs2_read_refcount_block(&new->rf_ci, rf_blkno, &ref_root_bh);
365 if (ret) {
366 mlog_errno(ret);
367 ocfs2_metadata_cache_exit(&new->rf_ci);
368 kfree(new);
369 return ret;
370 }
371
372 ref_rb = (struct ocfs2_refcount_block *)ref_root_bh->b_data;
373 new->rf_generation = le32_to_cpu(ref_rb->rf_generation);
374 ocfs2_init_refcount_tree_lock(osb, new, rf_blkno,
375 new->rf_generation);
376 ocfs2_metadata_cache_purge(&new->rf_ci);
377
378 spin_lock(&osb->osb_lock);
379 tree = ocfs2_find_refcount_tree(osb, rf_blkno);
380 if (tree)
381 goto out;
382
383 ocfs2_insert_refcount_tree(osb, new);
384
385 tree = new;
386 new = NULL;
387
388out:
389 *ret_tree = tree;
390
391 osb->osb_ref_tree_lru = tree;
392
393 spin_unlock(&osb->osb_lock);
394
395 if (new)
396 ocfs2_free_refcount_tree(new);
397
398 brelse(ref_root_bh);
399 return ret;
400}
401
402static int ocfs2_get_refcount_block(struct inode *inode, u64 *ref_blkno)
403{
404 int ret;
405 struct buffer_head *di_bh = NULL;
406 struct ocfs2_dinode *di;
407
408 ret = ocfs2_read_inode_block(inode, &di_bh);
409 if (ret) {
410 mlog_errno(ret);
411 goto out;
412 }
413
414 BUG_ON(!(OCFS2_I(inode)->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL));
415
416 di = (struct ocfs2_dinode *)di_bh->b_data;
417 *ref_blkno = le64_to_cpu(di->i_refcount_loc);
418 brelse(di_bh);
419out:
420 return ret;
421}
422
423static int __ocfs2_lock_refcount_tree(struct ocfs2_super *osb,
424 struct ocfs2_refcount_tree *tree, int rw)
425{
426 int ret;
427
428 ret = ocfs2_refcount_lock(tree, rw);
429 if (ret) {
430 mlog_errno(ret);
431 goto out;
432 }
433
434 if (rw)
435 down_write(&tree->rf_sem);
436 else
437 down_read(&tree->rf_sem);
438
439out:
440 return ret;
441}
442
443/*
444 * Lock the refcount tree pointed by ref_blkno and return the tree.
445 * In most case, we lock the tree and read the refcount block.
446 * So read it here if the caller really needs it.
447 *
448 * If the tree has been re-created by other node, it will free the
449 * old one and re-create it.
450 */
451int ocfs2_lock_refcount_tree(struct ocfs2_super *osb,
452 u64 ref_blkno, int rw,
453 struct ocfs2_refcount_tree **ret_tree,
454 struct buffer_head **ref_bh)
455{
456 int ret, delete_tree = 0;
457 struct ocfs2_refcount_tree *tree = NULL;
458 struct buffer_head *ref_root_bh = NULL;
459 struct ocfs2_refcount_block *rb;
460
461again:
462 ret = ocfs2_get_refcount_tree(osb, ref_blkno, &tree);
463 if (ret) {
464 mlog_errno(ret);
465 return ret;
466 }
467
468 ocfs2_refcount_tree_get(tree);
469
470 ret = __ocfs2_lock_refcount_tree(osb, tree, rw);
471 if (ret) {
472 mlog_errno(ret);
473 ocfs2_refcount_tree_put(tree);
474 goto out;
475 }
476
477 ret = ocfs2_read_refcount_block(&tree->rf_ci, tree->rf_blkno,
478 &ref_root_bh);
479 if (ret) {
480 mlog_errno(ret);
481 ocfs2_unlock_refcount_tree(osb, tree, rw);
482 ocfs2_refcount_tree_put(tree);
483 goto out;
484 }
485
486 rb = (struct ocfs2_refcount_block *)ref_root_bh->b_data;
487 /*
488 * If the refcount block has been freed and re-created, we may need
489 * to recreate the refcount tree also.
490 *
491 * Here we just remove the tree from the rb-tree, and the last
492 * kref holder will unlock and delete this refcount_tree.
493 * Then we goto "again" and ocfs2_get_refcount_tree will create
494 * the new refcount tree for us.
495 */
496 if (tree->rf_generation != le32_to_cpu(rb->rf_generation)) {
497 if (!tree->rf_removed) {
498 ocfs2_erase_refcount_tree_from_list(osb, tree);
499 tree->rf_removed = 1;
500 delete_tree = 1;
501 }
502
503 ocfs2_unlock_refcount_tree(osb, tree, rw);
504 /*
505 * We get an extra reference when we create the refcount
506 * tree, so another put will destroy it.
507 */
508 if (delete_tree)
509 ocfs2_refcount_tree_put(tree);
510 brelse(ref_root_bh);
511 ref_root_bh = NULL;
512 goto again;
513 }
514
515 *ret_tree = tree;
516 if (ref_bh) {
517 *ref_bh = ref_root_bh;
518 ref_root_bh = NULL;
519 }
520out:
521 brelse(ref_root_bh);
522 return ret;
523}
524
Tao Ma374a2632009-08-24 11:13:37 +0800525void ocfs2_unlock_refcount_tree(struct ocfs2_super *osb,
526 struct ocfs2_refcount_tree *tree, int rw)
527{
528 if (rw)
529 up_write(&tree->rf_sem);
530 else
531 up_read(&tree->rf_sem);
532
533 ocfs2_refcount_unlock(tree, rw);
534 ocfs2_refcount_tree_put(tree);
535}
536
537void ocfs2_purge_refcount_trees(struct ocfs2_super *osb)
538{
539 struct rb_node *node;
540 struct ocfs2_refcount_tree *tree;
541 struct rb_root *root = &osb->osb_rf_lock_tree;
542
543 while ((node = rb_last(root)) != NULL) {
544 tree = rb_entry(node, struct ocfs2_refcount_tree, rf_node);
545
Tao Ma198aac22011-02-22 08:20:04 +0800546 trace_ocfs2_purge_refcount_trees(
547 (unsigned long long) tree->rf_blkno);
Tao Ma374a2632009-08-24 11:13:37 +0800548
549 rb_erase(&tree->rf_node, root);
550 ocfs2_free_refcount_tree(tree);
551 }
552}
Tao Ma8bf396d2009-08-24 11:12:02 +0800553
554/*
555 * Create a refcount tree for an inode.
556 * We take for granted that the inode is already locked.
557 */
558static int ocfs2_create_refcount_tree(struct inode *inode,
559 struct buffer_head *di_bh)
560{
561 int ret;
562 handle_t *handle = NULL;
563 struct ocfs2_alloc_context *meta_ac = NULL;
564 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
565 struct ocfs2_inode_info *oi = OCFS2_I(inode);
566 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
567 struct buffer_head *new_bh = NULL;
568 struct ocfs2_refcount_block *rb;
569 struct ocfs2_refcount_tree *new_tree = NULL, *tree = NULL;
570 u16 suballoc_bit_start;
571 u32 num_got;
Joel Becker2b6cb572010-03-26 10:09:15 +0800572 u64 suballoc_loc, first_blkno;
Tao Ma8bf396d2009-08-24 11:12:02 +0800573
574 BUG_ON(oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL);
575
Tao Ma198aac22011-02-22 08:20:04 +0800576 trace_ocfs2_create_refcount_tree(
577 (unsigned long long)OCFS2_I(inode)->ip_blkno);
Tao Ma8bf396d2009-08-24 11:12:02 +0800578
579 ret = ocfs2_reserve_new_metadata_blocks(osb, 1, &meta_ac);
580 if (ret) {
581 mlog_errno(ret);
582 goto out;
583 }
584
585 handle = ocfs2_start_trans(osb, OCFS2_REFCOUNT_TREE_CREATE_CREDITS);
586 if (IS_ERR(handle)) {
587 ret = PTR_ERR(handle);
588 mlog_errno(ret);
589 goto out;
590 }
591
592 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
593 OCFS2_JOURNAL_ACCESS_WRITE);
594 if (ret) {
595 mlog_errno(ret);
596 goto out_commit;
597 }
598
Joel Becker2b6cb572010-03-26 10:09:15 +0800599 ret = ocfs2_claim_metadata(handle, meta_ac, 1, &suballoc_loc,
Tao Ma8bf396d2009-08-24 11:12:02 +0800600 &suballoc_bit_start, &num_got,
601 &first_blkno);
602 if (ret) {
603 mlog_errno(ret);
604 goto out_commit;
605 }
606
607 new_tree = ocfs2_allocate_refcount_tree(osb, first_blkno);
608 if (!new_tree) {
609 ret = -ENOMEM;
610 mlog_errno(ret);
611 goto out_commit;
612 }
613
614 new_bh = sb_getblk(inode->i_sb, first_blkno);
615 ocfs2_set_new_buffer_uptodate(&new_tree->rf_ci, new_bh);
616
617 ret = ocfs2_journal_access_rb(handle, &new_tree->rf_ci, new_bh,
618 OCFS2_JOURNAL_ACCESS_CREATE);
619 if (ret) {
620 mlog_errno(ret);
621 goto out_commit;
622 }
623
624 /* Initialize ocfs2_refcount_block. */
625 rb = (struct ocfs2_refcount_block *)new_bh->b_data;
626 memset(rb, 0, inode->i_sb->s_blocksize);
627 strcpy((void *)rb, OCFS2_REFCOUNT_BLOCK_SIGNATURE);
Tiger Yangb89c5422010-01-25 14:11:06 +0800628 rb->rf_suballoc_slot = cpu_to_le16(meta_ac->ac_alloc_slot);
Joel Becker2b6cb572010-03-26 10:09:15 +0800629 rb->rf_suballoc_loc = cpu_to_le64(suballoc_loc);
Tao Ma8bf396d2009-08-24 11:12:02 +0800630 rb->rf_suballoc_bit = cpu_to_le16(suballoc_bit_start);
631 rb->rf_fs_generation = cpu_to_le32(osb->fs_generation);
632 rb->rf_blkno = cpu_to_le64(first_blkno);
633 rb->rf_count = cpu_to_le32(1);
634 rb->rf_records.rl_count =
635 cpu_to_le16(ocfs2_refcount_recs_per_rb(osb->sb));
636 spin_lock(&osb->osb_lock);
637 rb->rf_generation = osb->s_next_generation++;
638 spin_unlock(&osb->osb_lock);
639
640 ocfs2_journal_dirty(handle, new_bh);
641
642 spin_lock(&oi->ip_lock);
643 oi->ip_dyn_features |= OCFS2_HAS_REFCOUNT_FL;
644 di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
645 di->i_refcount_loc = cpu_to_le64(first_blkno);
646 spin_unlock(&oi->ip_lock);
647
Tao Ma198aac22011-02-22 08:20:04 +0800648 trace_ocfs2_create_refcount_tree_blkno((unsigned long long)first_blkno);
Tao Ma8bf396d2009-08-24 11:12:02 +0800649
650 ocfs2_journal_dirty(handle, di_bh);
651
652 /*
653 * We have to init the tree lock here since it will use
654 * the generation number to create it.
655 */
656 new_tree->rf_generation = le32_to_cpu(rb->rf_generation);
657 ocfs2_init_refcount_tree_lock(osb, new_tree, first_blkno,
658 new_tree->rf_generation);
659
660 spin_lock(&osb->osb_lock);
661 tree = ocfs2_find_refcount_tree(osb, first_blkno);
662
663 /*
664 * We've just created a new refcount tree in this block. If
665 * we found a refcount tree on the ocfs2_super, it must be
666 * one we just deleted. We free the old tree before
667 * inserting the new tree.
668 */
669 BUG_ON(tree && tree->rf_generation == new_tree->rf_generation);
670 if (tree)
671 ocfs2_erase_refcount_tree_from_list_no_lock(osb, tree);
672 ocfs2_insert_refcount_tree(osb, new_tree);
673 spin_unlock(&osb->osb_lock);
674 new_tree = NULL;
675 if (tree)
676 ocfs2_refcount_tree_put(tree);
677
678out_commit:
679 ocfs2_commit_trans(osb, handle);
680
681out:
682 if (new_tree) {
683 ocfs2_metadata_cache_exit(&new_tree->rf_ci);
684 kfree(new_tree);
685 }
686
687 brelse(new_bh);
688 if (meta_ac)
689 ocfs2_free_alloc_context(meta_ac);
690
691 return ret;
692}
693
694static int ocfs2_set_refcount_tree(struct inode *inode,
695 struct buffer_head *di_bh,
696 u64 refcount_loc)
697{
698 int ret;
699 handle_t *handle = NULL;
700 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
701 struct ocfs2_inode_info *oi = OCFS2_I(inode);
702 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
703 struct buffer_head *ref_root_bh = NULL;
704 struct ocfs2_refcount_block *rb;
705 struct ocfs2_refcount_tree *ref_tree;
706
707 BUG_ON(oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL);
708
709 ret = ocfs2_lock_refcount_tree(osb, refcount_loc, 1,
710 &ref_tree, &ref_root_bh);
711 if (ret) {
712 mlog_errno(ret);
713 return ret;
714 }
715
716 handle = ocfs2_start_trans(osb, OCFS2_REFCOUNT_TREE_SET_CREDITS);
717 if (IS_ERR(handle)) {
718 ret = PTR_ERR(handle);
719 mlog_errno(ret);
720 goto out;
721 }
722
723 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
724 OCFS2_JOURNAL_ACCESS_WRITE);
725 if (ret) {
726 mlog_errno(ret);
727 goto out_commit;
728 }
729
730 ret = ocfs2_journal_access_rb(handle, &ref_tree->rf_ci, ref_root_bh,
731 OCFS2_JOURNAL_ACCESS_WRITE);
732 if (ret) {
733 mlog_errno(ret);
734 goto out_commit;
735 }
736
737 rb = (struct ocfs2_refcount_block *)ref_root_bh->b_data;
738 le32_add_cpu(&rb->rf_count, 1);
739
740 ocfs2_journal_dirty(handle, ref_root_bh);
741
742 spin_lock(&oi->ip_lock);
743 oi->ip_dyn_features |= OCFS2_HAS_REFCOUNT_FL;
744 di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
745 di->i_refcount_loc = cpu_to_le64(refcount_loc);
746 spin_unlock(&oi->ip_lock);
747 ocfs2_journal_dirty(handle, di_bh);
748
749out_commit:
750 ocfs2_commit_trans(osb, handle);
751out:
752 ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
753 brelse(ref_root_bh);
754
755 return ret;
756}
757
758int ocfs2_remove_refcount_tree(struct inode *inode, struct buffer_head *di_bh)
759{
760 int ret, delete_tree = 0;
761 handle_t *handle = NULL;
762 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
763 struct ocfs2_inode_info *oi = OCFS2_I(inode);
764 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
765 struct ocfs2_refcount_block *rb;
766 struct inode *alloc_inode = NULL;
767 struct buffer_head *alloc_bh = NULL;
768 struct buffer_head *blk_bh = NULL;
769 struct ocfs2_refcount_tree *ref_tree;
770 int credits = OCFS2_REFCOUNT_TREE_REMOVE_CREDITS;
771 u64 blk = 0, bg_blkno = 0, ref_blkno = le64_to_cpu(di->i_refcount_loc);
772 u16 bit = 0;
773
774 if (!(oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL))
775 return 0;
776
777 BUG_ON(!ref_blkno);
778 ret = ocfs2_lock_refcount_tree(osb, ref_blkno, 1, &ref_tree, &blk_bh);
779 if (ret) {
780 mlog_errno(ret);
781 return ret;
782 }
783
784 rb = (struct ocfs2_refcount_block *)blk_bh->b_data;
785
786 /*
787 * If we are the last user, we need to free the block.
788 * So lock the allocator ahead.
789 */
790 if (le32_to_cpu(rb->rf_count) == 1) {
791 blk = le64_to_cpu(rb->rf_blkno);
792 bit = le16_to_cpu(rb->rf_suballoc_bit);
Tao Ma74380c42010-03-22 14:20:18 +0800793 if (rb->rf_suballoc_loc)
794 bg_blkno = le64_to_cpu(rb->rf_suballoc_loc);
795 else
796 bg_blkno = ocfs2_which_suballoc_group(blk, bit);
Tao Ma8bf396d2009-08-24 11:12:02 +0800797
798 alloc_inode = ocfs2_get_system_file_inode(osb,
799 EXTENT_ALLOC_SYSTEM_INODE,
800 le16_to_cpu(rb->rf_suballoc_slot));
801 if (!alloc_inode) {
802 ret = -ENOMEM;
803 mlog_errno(ret);
804 goto out;
805 }
806 mutex_lock(&alloc_inode->i_mutex);
807
808 ret = ocfs2_inode_lock(alloc_inode, &alloc_bh, 1);
809 if (ret) {
810 mlog_errno(ret);
811 goto out_mutex;
812 }
813
814 credits += OCFS2_SUBALLOC_FREE;
815 }
816
817 handle = ocfs2_start_trans(osb, credits);
818 if (IS_ERR(handle)) {
819 ret = PTR_ERR(handle);
820 mlog_errno(ret);
821 goto out_unlock;
822 }
823
824 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
825 OCFS2_JOURNAL_ACCESS_WRITE);
826 if (ret) {
827 mlog_errno(ret);
828 goto out_commit;
829 }
830
831 ret = ocfs2_journal_access_rb(handle, &ref_tree->rf_ci, blk_bh,
832 OCFS2_JOURNAL_ACCESS_WRITE);
833 if (ret) {
834 mlog_errno(ret);
835 goto out_commit;
836 }
837
838 spin_lock(&oi->ip_lock);
839 oi->ip_dyn_features &= ~OCFS2_HAS_REFCOUNT_FL;
840 di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
841 di->i_refcount_loc = 0;
842 spin_unlock(&oi->ip_lock);
843 ocfs2_journal_dirty(handle, di_bh);
844
845 le32_add_cpu(&rb->rf_count , -1);
846 ocfs2_journal_dirty(handle, blk_bh);
847
848 if (!rb->rf_count) {
849 delete_tree = 1;
850 ocfs2_erase_refcount_tree_from_list(osb, ref_tree);
851 ret = ocfs2_free_suballoc_bits(handle, alloc_inode,
852 alloc_bh, bit, bg_blkno, 1);
853 if (ret)
854 mlog_errno(ret);
855 }
856
857out_commit:
858 ocfs2_commit_trans(osb, handle);
859out_unlock:
860 if (alloc_inode) {
861 ocfs2_inode_unlock(alloc_inode, 1);
862 brelse(alloc_bh);
863 }
864out_mutex:
865 if (alloc_inode) {
866 mutex_unlock(&alloc_inode->i_mutex);
867 iput(alloc_inode);
868 }
869out:
870 ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
871 if (delete_tree)
872 ocfs2_refcount_tree_put(ref_tree);
873 brelse(blk_bh);
874
875 return ret;
876}
Tao Mae73a8192009-08-11 14:33:14 +0800877
878static void ocfs2_find_refcount_rec_in_rl(struct ocfs2_caching_info *ci,
879 struct buffer_head *ref_leaf_bh,
880 u64 cpos, unsigned int len,
881 struct ocfs2_refcount_rec *ret_rec,
882 int *index)
883{
884 int i = 0;
885 struct ocfs2_refcount_block *rb =
886 (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
887 struct ocfs2_refcount_rec *rec = NULL;
888
889 for (; i < le16_to_cpu(rb->rf_records.rl_used); i++) {
890 rec = &rb->rf_records.rl_recs[i];
891
892 if (le64_to_cpu(rec->r_cpos) +
893 le32_to_cpu(rec->r_clusters) <= cpos)
894 continue;
895 else if (le64_to_cpu(rec->r_cpos) > cpos)
896 break;
897
898 /* ok, cpos fail in this rec. Just return. */
899 if (ret_rec)
900 *ret_rec = *rec;
901 goto out;
902 }
903
904 if (ret_rec) {
905 /* We meet with a hole here, so fake the rec. */
906 ret_rec->r_cpos = cpu_to_le64(cpos);
907 ret_rec->r_refcount = 0;
908 if (i < le16_to_cpu(rb->rf_records.rl_used) &&
909 le64_to_cpu(rec->r_cpos) < cpos + len)
910 ret_rec->r_clusters =
911 cpu_to_le32(le64_to_cpu(rec->r_cpos) - cpos);
912 else
913 ret_rec->r_clusters = cpu_to_le32(len);
914 }
915
916out:
917 *index = i;
918}
919
920/*
Tao Ma8b2c0db2009-08-18 11:43:49 +0800921 * Try to remove refcount tree. The mechanism is:
922 * 1) Check whether i_clusters == 0, if no, exit.
923 * 2) check whether we have i_xattr_loc in dinode. if yes, exit.
924 * 3) Check whether we have inline xattr stored outside, if yes, exit.
925 * 4) Remove the tree.
926 */
927int ocfs2_try_remove_refcount_tree(struct inode *inode,
928 struct buffer_head *di_bh)
929{
930 int ret;
931 struct ocfs2_inode_info *oi = OCFS2_I(inode);
932 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
933
934 down_write(&oi->ip_xattr_sem);
935 down_write(&oi->ip_alloc_sem);
936
937 if (oi->ip_clusters)
938 goto out;
939
940 if ((oi->ip_dyn_features & OCFS2_HAS_XATTR_FL) && di->i_xattr_loc)
941 goto out;
942
943 if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL &&
944 ocfs2_has_inline_xattr_value_outside(inode, di))
945 goto out;
946
947 ret = ocfs2_remove_refcount_tree(inode, di_bh);
948 if (ret)
949 mlog_errno(ret);
950out:
951 up_write(&oi->ip_alloc_sem);
952 up_write(&oi->ip_xattr_sem);
953 return 0;
954}
955
956/*
Tao Ma38a04e42009-11-30 14:32:19 +0800957 * Find the end range for a leaf refcount block indicated by
958 * el->l_recs[index].e_blkno.
959 */
960static int ocfs2_get_refcount_cpos_end(struct ocfs2_caching_info *ci,
961 struct buffer_head *ref_root_bh,
962 struct ocfs2_extent_block *eb,
963 struct ocfs2_extent_list *el,
964 int index, u32 *cpos_end)
965{
966 int ret, i, subtree_root;
967 u32 cpos;
968 u64 blkno;
969 struct super_block *sb = ocfs2_metadata_cache_get_super(ci);
970 struct ocfs2_path *left_path = NULL, *right_path = NULL;
971 struct ocfs2_extent_tree et;
972 struct ocfs2_extent_list *tmp_el;
973
974 if (index < le16_to_cpu(el->l_next_free_rec) - 1) {
975 /*
976 * We have a extent rec after index, so just use the e_cpos
977 * of the next extent rec.
978 */
979 *cpos_end = le32_to_cpu(el->l_recs[index+1].e_cpos);
980 return 0;
981 }
982
983 if (!eb || (eb && !eb->h_next_leaf_blk)) {
984 /*
985 * We are the last extent rec, so any high cpos should
986 * be stored in this leaf refcount block.
987 */
988 *cpos_end = UINT_MAX;
989 return 0;
990 }
991
992 /*
993 * If the extent block isn't the last one, we have to find
994 * the subtree root between this extent block and the next
995 * leaf extent block and get the corresponding e_cpos from
996 * the subroot. Otherwise we may corrupt the b-tree.
997 */
998 ocfs2_init_refcount_extent_tree(&et, ci, ref_root_bh);
999
1000 left_path = ocfs2_new_path_from_et(&et);
1001 if (!left_path) {
1002 ret = -ENOMEM;
1003 mlog_errno(ret);
1004 goto out;
1005 }
1006
1007 cpos = le32_to_cpu(eb->h_list.l_recs[index].e_cpos);
1008 ret = ocfs2_find_path(ci, left_path, cpos);
1009 if (ret) {
1010 mlog_errno(ret);
1011 goto out;
1012 }
1013
1014 right_path = ocfs2_new_path_from_path(left_path);
1015 if (!right_path) {
1016 ret = -ENOMEM;
1017 mlog_errno(ret);
1018 goto out;
1019 }
1020
1021 ret = ocfs2_find_cpos_for_right_leaf(sb, left_path, &cpos);
1022 if (ret) {
1023 mlog_errno(ret);
1024 goto out;
1025 }
1026
1027 ret = ocfs2_find_path(ci, right_path, cpos);
1028 if (ret) {
1029 mlog_errno(ret);
1030 goto out;
1031 }
1032
1033 subtree_root = ocfs2_find_subtree_root(&et, left_path,
1034 right_path);
1035
1036 tmp_el = left_path->p_node[subtree_root].el;
1037 blkno = left_path->p_node[subtree_root+1].bh->b_blocknr;
Al Viro3a251f02012-04-13 12:22:00 -04001038 for (i = 0; i < le16_to_cpu(tmp_el->l_next_free_rec); i++) {
Tao Ma38a04e42009-11-30 14:32:19 +08001039 if (le64_to_cpu(tmp_el->l_recs[i].e_blkno) == blkno) {
1040 *cpos_end = le32_to_cpu(tmp_el->l_recs[i+1].e_cpos);
1041 break;
1042 }
1043 }
1044
Al Viro3a251f02012-04-13 12:22:00 -04001045 BUG_ON(i == le16_to_cpu(tmp_el->l_next_free_rec));
Tao Ma38a04e42009-11-30 14:32:19 +08001046
1047out:
1048 ocfs2_free_path(left_path);
1049 ocfs2_free_path(right_path);
1050 return ret;
1051}
1052
1053/*
Tao Mae73a8192009-08-11 14:33:14 +08001054 * Given a cpos and len, try to find the refcount record which contains cpos.
1055 * 1. If cpos can be found in one refcount record, return the record.
1056 * 2. If cpos can't be found, return a fake record which start from cpos
1057 * and end at a small value between cpos+len and start of the next record.
1058 * This fake record has r_refcount = 0.
1059 */
1060static int ocfs2_get_refcount_rec(struct ocfs2_caching_info *ci,
1061 struct buffer_head *ref_root_bh,
1062 u64 cpos, unsigned int len,
1063 struct ocfs2_refcount_rec *ret_rec,
1064 int *index,
1065 struct buffer_head **ret_bh)
1066{
1067 int ret = 0, i, found;
Tao Ma38a04e42009-11-30 14:32:19 +08001068 u32 low_cpos, uninitialized_var(cpos_end);
Tao Mae73a8192009-08-11 14:33:14 +08001069 struct ocfs2_extent_list *el;
Tao Ma38a04e42009-11-30 14:32:19 +08001070 struct ocfs2_extent_rec *rec = NULL;
1071 struct ocfs2_extent_block *eb = NULL;
Tao Mae73a8192009-08-11 14:33:14 +08001072 struct buffer_head *eb_bh = NULL, *ref_leaf_bh = NULL;
1073 struct super_block *sb = ocfs2_metadata_cache_get_super(ci);
1074 struct ocfs2_refcount_block *rb =
1075 (struct ocfs2_refcount_block *)ref_root_bh->b_data;
1076
1077 if (!(le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL)) {
1078 ocfs2_find_refcount_rec_in_rl(ci, ref_root_bh, cpos, len,
1079 ret_rec, index);
1080 *ret_bh = ref_root_bh;
1081 get_bh(ref_root_bh);
1082 return 0;
1083 }
1084
1085 el = &rb->rf_list;
1086 low_cpos = cpos & OCFS2_32BIT_POS_MASK;
1087
1088 if (el->l_tree_depth) {
1089 ret = ocfs2_find_leaf(ci, el, low_cpos, &eb_bh);
1090 if (ret) {
1091 mlog_errno(ret);
1092 goto out;
1093 }
1094
1095 eb = (struct ocfs2_extent_block *) eb_bh->b_data;
1096 el = &eb->h_list;
1097
1098 if (el->l_tree_depth) {
1099 ocfs2_error(sb,
1100 "refcount tree %llu has non zero tree "
1101 "depth in leaf btree tree block %llu\n",
1102 (unsigned long long)ocfs2_metadata_cache_owner(ci),
1103 (unsigned long long)eb_bh->b_blocknr);
1104 ret = -EROFS;
1105 goto out;
1106 }
1107 }
1108
1109 found = 0;
1110 for (i = le16_to_cpu(el->l_next_free_rec) - 1; i >= 0; i--) {
1111 rec = &el->l_recs[i];
1112
1113 if (le32_to_cpu(rec->e_cpos) <= low_cpos) {
1114 found = 1;
1115 break;
1116 }
1117 }
1118
Tao Ma38a04e42009-11-30 14:32:19 +08001119 if (found) {
1120 ret = ocfs2_get_refcount_cpos_end(ci, ref_root_bh,
1121 eb, el, i, &cpos_end);
1122 if (ret) {
1123 mlog_errno(ret);
1124 goto out;
1125 }
Tao Mae73a8192009-08-11 14:33:14 +08001126
Tao Ma38a04e42009-11-30 14:32:19 +08001127 if (cpos_end < low_cpos + len)
1128 len = cpos_end - low_cpos;
Tao Mae73a8192009-08-11 14:33:14 +08001129 }
1130
1131 ret = ocfs2_read_refcount_block(ci, le64_to_cpu(rec->e_blkno),
1132 &ref_leaf_bh);
1133 if (ret) {
1134 mlog_errno(ret);
1135 goto out;
1136 }
1137
1138 ocfs2_find_refcount_rec_in_rl(ci, ref_leaf_bh, cpos, len,
1139 ret_rec, index);
1140 *ret_bh = ref_leaf_bh;
1141out:
1142 brelse(eb_bh);
1143 return ret;
1144}
1145
1146enum ocfs2_ref_rec_contig {
1147 REF_CONTIG_NONE = 0,
1148 REF_CONTIG_LEFT,
1149 REF_CONTIG_RIGHT,
1150 REF_CONTIG_LEFTRIGHT,
1151};
1152
1153static enum ocfs2_ref_rec_contig
1154 ocfs2_refcount_rec_adjacent(struct ocfs2_refcount_block *rb,
1155 int index)
1156{
1157 if ((rb->rf_records.rl_recs[index].r_refcount ==
1158 rb->rf_records.rl_recs[index + 1].r_refcount) &&
1159 (le64_to_cpu(rb->rf_records.rl_recs[index].r_cpos) +
1160 le32_to_cpu(rb->rf_records.rl_recs[index].r_clusters) ==
1161 le64_to_cpu(rb->rf_records.rl_recs[index + 1].r_cpos)))
1162 return REF_CONTIG_RIGHT;
1163
1164 return REF_CONTIG_NONE;
1165}
1166
1167static enum ocfs2_ref_rec_contig
1168 ocfs2_refcount_rec_contig(struct ocfs2_refcount_block *rb,
1169 int index)
1170{
1171 enum ocfs2_ref_rec_contig ret = REF_CONTIG_NONE;
1172
1173 if (index < le16_to_cpu(rb->rf_records.rl_used) - 1)
1174 ret = ocfs2_refcount_rec_adjacent(rb, index);
1175
1176 if (index > 0) {
1177 enum ocfs2_ref_rec_contig tmp;
1178
1179 tmp = ocfs2_refcount_rec_adjacent(rb, index - 1);
1180
1181 if (tmp == REF_CONTIG_RIGHT) {
1182 if (ret == REF_CONTIG_RIGHT)
1183 ret = REF_CONTIG_LEFTRIGHT;
1184 else
1185 ret = REF_CONTIG_LEFT;
1186 }
1187 }
1188
1189 return ret;
1190}
1191
1192static void ocfs2_rotate_refcount_rec_left(struct ocfs2_refcount_block *rb,
1193 int index)
1194{
1195 BUG_ON(rb->rf_records.rl_recs[index].r_refcount !=
1196 rb->rf_records.rl_recs[index+1].r_refcount);
1197
1198 le32_add_cpu(&rb->rf_records.rl_recs[index].r_clusters,
1199 le32_to_cpu(rb->rf_records.rl_recs[index+1].r_clusters));
1200
1201 if (index < le16_to_cpu(rb->rf_records.rl_used) - 2)
1202 memmove(&rb->rf_records.rl_recs[index + 1],
1203 &rb->rf_records.rl_recs[index + 2],
1204 sizeof(struct ocfs2_refcount_rec) *
1205 (le16_to_cpu(rb->rf_records.rl_used) - index - 2));
1206
1207 memset(&rb->rf_records.rl_recs[le16_to_cpu(rb->rf_records.rl_used) - 1],
1208 0, sizeof(struct ocfs2_refcount_rec));
1209 le16_add_cpu(&rb->rf_records.rl_used, -1);
1210}
1211
1212/*
1213 * Merge the refcount rec if we are contiguous with the adjacent recs.
1214 */
1215static void ocfs2_refcount_rec_merge(struct ocfs2_refcount_block *rb,
1216 int index)
1217{
1218 enum ocfs2_ref_rec_contig contig =
1219 ocfs2_refcount_rec_contig(rb, index);
1220
1221 if (contig == REF_CONTIG_NONE)
1222 return;
1223
1224 if (contig == REF_CONTIG_LEFT || contig == REF_CONTIG_LEFTRIGHT) {
1225 BUG_ON(index == 0);
1226 index--;
1227 }
1228
1229 ocfs2_rotate_refcount_rec_left(rb, index);
1230
1231 if (contig == REF_CONTIG_LEFTRIGHT)
1232 ocfs2_rotate_refcount_rec_left(rb, index);
1233}
1234
Tao Ma1823cb02009-08-18 11:24:49 +08001235/*
1236 * Change the refcount indexed by "index" in ref_bh.
1237 * If refcount reaches 0, remove it.
1238 */
Tao Mae73a8192009-08-11 14:33:14 +08001239static int ocfs2_change_refcount_rec(handle_t *handle,
1240 struct ocfs2_caching_info *ci,
1241 struct buffer_head *ref_leaf_bh,
Tao Ma7540c1a2009-08-18 11:44:03 +08001242 int index, int merge, int change)
Tao Mae73a8192009-08-11 14:33:14 +08001243{
1244 int ret;
1245 struct ocfs2_refcount_block *rb =
1246 (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
Tao Ma1823cb02009-08-18 11:24:49 +08001247 struct ocfs2_refcount_list *rl = &rb->rf_records;
1248 struct ocfs2_refcount_rec *rec = &rl->rl_recs[index];
Tao Mae73a8192009-08-11 14:33:14 +08001249
1250 ret = ocfs2_journal_access_rb(handle, ci, ref_leaf_bh,
1251 OCFS2_JOURNAL_ACCESS_WRITE);
1252 if (ret) {
1253 mlog_errno(ret);
1254 goto out;
1255 }
1256
Tao Ma198aac22011-02-22 08:20:04 +08001257 trace_ocfs2_change_refcount_rec(
1258 (unsigned long long)ocfs2_metadata_cache_owner(ci),
1259 index, le32_to_cpu(rec->r_refcount), change);
Tao Mae73a8192009-08-11 14:33:14 +08001260 le32_add_cpu(&rec->r_refcount, change);
1261
Tao Ma1823cb02009-08-18 11:24:49 +08001262 if (!rec->r_refcount) {
1263 if (index != le16_to_cpu(rl->rl_used) - 1) {
1264 memmove(rec, rec + 1,
1265 (le16_to_cpu(rl->rl_used) - index - 1) *
1266 sizeof(struct ocfs2_refcount_rec));
1267 memset(&rl->rl_recs[le16_to_cpu(rl->rl_used) - 1],
1268 0, sizeof(struct ocfs2_refcount_rec));
1269 }
1270
1271 le16_add_cpu(&rl->rl_used, -1);
Tao Ma7540c1a2009-08-18 11:44:03 +08001272 } else if (merge)
Tao Ma1823cb02009-08-18 11:24:49 +08001273 ocfs2_refcount_rec_merge(rb, index);
Tao Mae73a8192009-08-11 14:33:14 +08001274
Joel Beckerec20cec2010-03-19 14:13:52 -07001275 ocfs2_journal_dirty(handle, ref_leaf_bh);
Tao Mae73a8192009-08-11 14:33:14 +08001276out:
1277 return ret;
1278}
1279
1280static int ocfs2_expand_inline_ref_root(handle_t *handle,
1281 struct ocfs2_caching_info *ci,
1282 struct buffer_head *ref_root_bh,
1283 struct buffer_head **ref_leaf_bh,
1284 struct ocfs2_alloc_context *meta_ac)
1285{
1286 int ret;
1287 u16 suballoc_bit_start;
1288 u32 num_got;
Joel Becker2b6cb572010-03-26 10:09:15 +08001289 u64 suballoc_loc, blkno;
Tao Mae73a8192009-08-11 14:33:14 +08001290 struct super_block *sb = ocfs2_metadata_cache_get_super(ci);
1291 struct buffer_head *new_bh = NULL;
1292 struct ocfs2_refcount_block *new_rb;
1293 struct ocfs2_refcount_block *root_rb =
1294 (struct ocfs2_refcount_block *)ref_root_bh->b_data;
1295
1296 ret = ocfs2_journal_access_rb(handle, ci, ref_root_bh,
1297 OCFS2_JOURNAL_ACCESS_WRITE);
1298 if (ret) {
1299 mlog_errno(ret);
1300 goto out;
1301 }
1302
Joel Becker2b6cb572010-03-26 10:09:15 +08001303 ret = ocfs2_claim_metadata(handle, meta_ac, 1, &suballoc_loc,
Tao Mae73a8192009-08-11 14:33:14 +08001304 &suballoc_bit_start, &num_got,
1305 &blkno);
1306 if (ret) {
1307 mlog_errno(ret);
1308 goto out;
1309 }
1310
1311 new_bh = sb_getblk(sb, blkno);
1312 if (new_bh == NULL) {
1313 ret = -EIO;
1314 mlog_errno(ret);
1315 goto out;
1316 }
1317 ocfs2_set_new_buffer_uptodate(ci, new_bh);
1318
1319 ret = ocfs2_journal_access_rb(handle, ci, new_bh,
1320 OCFS2_JOURNAL_ACCESS_CREATE);
1321 if (ret) {
1322 mlog_errno(ret);
1323 goto out;
1324 }
1325
1326 /*
1327 * Initialize ocfs2_refcount_block.
1328 * It should contain the same information as the old root.
1329 * so just memcpy it and change the corresponding field.
1330 */
1331 memcpy(new_bh->b_data, ref_root_bh->b_data, sb->s_blocksize);
1332
1333 new_rb = (struct ocfs2_refcount_block *)new_bh->b_data;
Tiger Yangb89c5422010-01-25 14:11:06 +08001334 new_rb->rf_suballoc_slot = cpu_to_le16(meta_ac->ac_alloc_slot);
Joel Becker2b6cb572010-03-26 10:09:15 +08001335 new_rb->rf_suballoc_loc = cpu_to_le64(suballoc_loc);
Tao Mae73a8192009-08-11 14:33:14 +08001336 new_rb->rf_suballoc_bit = cpu_to_le16(suballoc_bit_start);
1337 new_rb->rf_blkno = cpu_to_le64(blkno);
1338 new_rb->rf_cpos = cpu_to_le32(0);
1339 new_rb->rf_parent = cpu_to_le64(ref_root_bh->b_blocknr);
1340 new_rb->rf_flags = cpu_to_le32(OCFS2_REFCOUNT_LEAF_FL);
1341 ocfs2_journal_dirty(handle, new_bh);
1342
1343 /* Now change the root. */
1344 memset(&root_rb->rf_list, 0, sb->s_blocksize -
1345 offsetof(struct ocfs2_refcount_block, rf_list));
1346 root_rb->rf_list.l_count = cpu_to_le16(ocfs2_extent_recs_per_rb(sb));
1347 root_rb->rf_clusters = cpu_to_le32(1);
1348 root_rb->rf_list.l_next_free_rec = cpu_to_le16(1);
1349 root_rb->rf_list.l_recs[0].e_blkno = cpu_to_le64(blkno);
1350 root_rb->rf_list.l_recs[0].e_leaf_clusters = cpu_to_le16(1);
1351 root_rb->rf_flags = cpu_to_le32(OCFS2_REFCOUNT_TREE_FL);
1352
1353 ocfs2_journal_dirty(handle, ref_root_bh);
1354
Tao Ma198aac22011-02-22 08:20:04 +08001355 trace_ocfs2_expand_inline_ref_root((unsigned long long)blkno,
1356 le16_to_cpu(new_rb->rf_records.rl_used));
Tao Mae73a8192009-08-11 14:33:14 +08001357
1358 *ref_leaf_bh = new_bh;
1359 new_bh = NULL;
1360out:
1361 brelse(new_bh);
1362 return ret;
1363}
1364
1365static int ocfs2_refcount_rec_no_intersect(struct ocfs2_refcount_rec *prev,
1366 struct ocfs2_refcount_rec *next)
1367{
1368 if (ocfs2_get_ref_rec_low_cpos(prev) + le32_to_cpu(prev->r_clusters) <=
1369 ocfs2_get_ref_rec_low_cpos(next))
1370 return 1;
1371
1372 return 0;
1373}
1374
1375static int cmp_refcount_rec_by_low_cpos(const void *a, const void *b)
1376{
1377 const struct ocfs2_refcount_rec *l = a, *r = b;
1378 u32 l_cpos = ocfs2_get_ref_rec_low_cpos(l);
1379 u32 r_cpos = ocfs2_get_ref_rec_low_cpos(r);
1380
1381 if (l_cpos > r_cpos)
1382 return 1;
1383 if (l_cpos < r_cpos)
1384 return -1;
1385 return 0;
1386}
1387
1388static int cmp_refcount_rec_by_cpos(const void *a, const void *b)
1389{
1390 const struct ocfs2_refcount_rec *l = a, *r = b;
1391 u64 l_cpos = le64_to_cpu(l->r_cpos);
1392 u64 r_cpos = le64_to_cpu(r->r_cpos);
1393
1394 if (l_cpos > r_cpos)
1395 return 1;
1396 if (l_cpos < r_cpos)
1397 return -1;
1398 return 0;
1399}
1400
1401static void swap_refcount_rec(void *a, void *b, int size)
1402{
1403 struct ocfs2_refcount_rec *l = a, *r = b, tmp;
1404
1405 tmp = *(struct ocfs2_refcount_rec *)l;
1406 *(struct ocfs2_refcount_rec *)l =
1407 *(struct ocfs2_refcount_rec *)r;
1408 *(struct ocfs2_refcount_rec *)r = tmp;
1409}
1410
1411/*
1412 * The refcount cpos are ordered by their 64bit cpos,
1413 * But we will use the low 32 bit to be the e_cpos in the b-tree.
1414 * So we need to make sure that this pos isn't intersected with others.
1415 *
1416 * Note: The refcount block is already sorted by their low 32 bit cpos,
1417 * So just try the middle pos first, and we will exit when we find
1418 * the good position.
1419 */
1420static int ocfs2_find_refcount_split_pos(struct ocfs2_refcount_list *rl,
1421 u32 *split_pos, int *split_index)
1422{
1423 int num_used = le16_to_cpu(rl->rl_used);
1424 int delta, middle = num_used / 2;
1425
1426 for (delta = 0; delta < middle; delta++) {
1427 /* Let's check delta earlier than middle */
1428 if (ocfs2_refcount_rec_no_intersect(
1429 &rl->rl_recs[middle - delta - 1],
1430 &rl->rl_recs[middle - delta])) {
1431 *split_index = middle - delta;
1432 break;
1433 }
1434
1435 /* For even counts, don't walk off the end */
1436 if ((middle + delta + 1) == num_used)
1437 continue;
1438
1439 /* Now try delta past middle */
1440 if (ocfs2_refcount_rec_no_intersect(
1441 &rl->rl_recs[middle + delta],
1442 &rl->rl_recs[middle + delta + 1])) {
1443 *split_index = middle + delta + 1;
1444 break;
1445 }
1446 }
1447
1448 if (delta >= middle)
1449 return -ENOSPC;
1450
1451 *split_pos = ocfs2_get_ref_rec_low_cpos(&rl->rl_recs[*split_index]);
1452 return 0;
1453}
1454
1455static int ocfs2_divide_leaf_refcount_block(struct buffer_head *ref_leaf_bh,
1456 struct buffer_head *new_bh,
1457 u32 *split_cpos)
1458{
1459 int split_index = 0, num_moved, ret;
1460 u32 cpos = 0;
1461 struct ocfs2_refcount_block *rb =
1462 (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
1463 struct ocfs2_refcount_list *rl = &rb->rf_records;
1464 struct ocfs2_refcount_block *new_rb =
1465 (struct ocfs2_refcount_block *)new_bh->b_data;
1466 struct ocfs2_refcount_list *new_rl = &new_rb->rf_records;
1467
Tao Ma198aac22011-02-22 08:20:04 +08001468 trace_ocfs2_divide_leaf_refcount_block(
1469 (unsigned long long)ref_leaf_bh->b_blocknr,
Al Viro28748b32012-04-13 12:28:21 -04001470 le16_to_cpu(rl->rl_count), le16_to_cpu(rl->rl_used));
Tao Mae73a8192009-08-11 14:33:14 +08001471
1472 /*
1473 * XXX: Improvement later.
1474 * If we know all the high 32 bit cpos is the same, no need to sort.
1475 *
1476 * In order to make the whole process safe, we do:
1477 * 1. sort the entries by their low 32 bit cpos first so that we can
1478 * find the split cpos easily.
1479 * 2. call ocfs2_insert_extent to insert the new refcount block.
1480 * 3. move the refcount rec to the new block.
1481 * 4. sort the entries by their 64 bit cpos.
1482 * 5. dirty the new_rb and rb.
1483 */
1484 sort(&rl->rl_recs, le16_to_cpu(rl->rl_used),
1485 sizeof(struct ocfs2_refcount_rec),
1486 cmp_refcount_rec_by_low_cpos, swap_refcount_rec);
1487
1488 ret = ocfs2_find_refcount_split_pos(rl, &cpos, &split_index);
1489 if (ret) {
1490 mlog_errno(ret);
1491 return ret;
1492 }
1493
1494 new_rb->rf_cpos = cpu_to_le32(cpos);
1495
1496 /* move refcount records starting from split_index to the new block. */
1497 num_moved = le16_to_cpu(rl->rl_used) - split_index;
1498 memcpy(new_rl->rl_recs, &rl->rl_recs[split_index],
1499 num_moved * sizeof(struct ocfs2_refcount_rec));
1500
1501 /*ok, remove the entries we just moved over to the other block. */
1502 memset(&rl->rl_recs[split_index], 0,
1503 num_moved * sizeof(struct ocfs2_refcount_rec));
1504
1505 /* change old and new rl_used accordingly. */
1506 le16_add_cpu(&rl->rl_used, -num_moved);
Tao Ma12d4cec2009-11-30 15:08:40 +08001507 new_rl->rl_used = cpu_to_le16(num_moved);
Tao Mae73a8192009-08-11 14:33:14 +08001508
1509 sort(&rl->rl_recs, le16_to_cpu(rl->rl_used),
1510 sizeof(struct ocfs2_refcount_rec),
1511 cmp_refcount_rec_by_cpos, swap_refcount_rec);
1512
1513 sort(&new_rl->rl_recs, le16_to_cpu(new_rl->rl_used),
1514 sizeof(struct ocfs2_refcount_rec),
1515 cmp_refcount_rec_by_cpos, swap_refcount_rec);
1516
1517 *split_cpos = cpos;
1518 return 0;
1519}
1520
1521static int ocfs2_new_leaf_refcount_block(handle_t *handle,
1522 struct ocfs2_caching_info *ci,
1523 struct buffer_head *ref_root_bh,
1524 struct buffer_head *ref_leaf_bh,
1525 struct ocfs2_alloc_context *meta_ac)
1526{
1527 int ret;
1528 u16 suballoc_bit_start;
1529 u32 num_got, new_cpos;
Joel Becker2b6cb572010-03-26 10:09:15 +08001530 u64 suballoc_loc, blkno;
Tao Mae73a8192009-08-11 14:33:14 +08001531 struct super_block *sb = ocfs2_metadata_cache_get_super(ci);
1532 struct ocfs2_refcount_block *root_rb =
1533 (struct ocfs2_refcount_block *)ref_root_bh->b_data;
1534 struct buffer_head *new_bh = NULL;
1535 struct ocfs2_refcount_block *new_rb;
1536 struct ocfs2_extent_tree ref_et;
1537
1538 BUG_ON(!(le32_to_cpu(root_rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL));
1539
1540 ret = ocfs2_journal_access_rb(handle, ci, ref_root_bh,
1541 OCFS2_JOURNAL_ACCESS_WRITE);
1542 if (ret) {
1543 mlog_errno(ret);
1544 goto out;
1545 }
1546
1547 ret = ocfs2_journal_access_rb(handle, ci, ref_leaf_bh,
1548 OCFS2_JOURNAL_ACCESS_WRITE);
1549 if (ret) {
1550 mlog_errno(ret);
1551 goto out;
1552 }
1553
Joel Becker2b6cb572010-03-26 10:09:15 +08001554 ret = ocfs2_claim_metadata(handle, meta_ac, 1, &suballoc_loc,
Tao Mae73a8192009-08-11 14:33:14 +08001555 &suballoc_bit_start, &num_got,
1556 &blkno);
1557 if (ret) {
1558 mlog_errno(ret);
1559 goto out;
1560 }
1561
1562 new_bh = sb_getblk(sb, blkno);
1563 if (new_bh == NULL) {
1564 ret = -EIO;
1565 mlog_errno(ret);
1566 goto out;
1567 }
1568 ocfs2_set_new_buffer_uptodate(ci, new_bh);
1569
1570 ret = ocfs2_journal_access_rb(handle, ci, new_bh,
1571 OCFS2_JOURNAL_ACCESS_CREATE);
1572 if (ret) {
1573 mlog_errno(ret);
1574 goto out;
1575 }
1576
1577 /* Initialize ocfs2_refcount_block. */
1578 new_rb = (struct ocfs2_refcount_block *)new_bh->b_data;
1579 memset(new_rb, 0, sb->s_blocksize);
1580 strcpy((void *)new_rb, OCFS2_REFCOUNT_BLOCK_SIGNATURE);
Tiger Yangb89c5422010-01-25 14:11:06 +08001581 new_rb->rf_suballoc_slot = cpu_to_le16(meta_ac->ac_alloc_slot);
Joel Becker2b6cb572010-03-26 10:09:15 +08001582 new_rb->rf_suballoc_loc = cpu_to_le64(suballoc_loc);
Tao Mae73a8192009-08-11 14:33:14 +08001583 new_rb->rf_suballoc_bit = cpu_to_le16(suballoc_bit_start);
1584 new_rb->rf_fs_generation = cpu_to_le32(OCFS2_SB(sb)->fs_generation);
1585 new_rb->rf_blkno = cpu_to_le64(blkno);
1586 new_rb->rf_parent = cpu_to_le64(ref_root_bh->b_blocknr);
1587 new_rb->rf_flags = cpu_to_le32(OCFS2_REFCOUNT_LEAF_FL);
1588 new_rb->rf_records.rl_count =
1589 cpu_to_le16(ocfs2_refcount_recs_per_rb(sb));
1590 new_rb->rf_generation = root_rb->rf_generation;
1591
1592 ret = ocfs2_divide_leaf_refcount_block(ref_leaf_bh, new_bh, &new_cpos);
1593 if (ret) {
1594 mlog_errno(ret);
1595 goto out;
1596 }
1597
1598 ocfs2_journal_dirty(handle, ref_leaf_bh);
1599 ocfs2_journal_dirty(handle, new_bh);
1600
1601 ocfs2_init_refcount_extent_tree(&ref_et, ci, ref_root_bh);
1602
Tao Ma198aac22011-02-22 08:20:04 +08001603 trace_ocfs2_new_leaf_refcount_block(
1604 (unsigned long long)new_bh->b_blocknr, new_cpos);
Tao Mae73a8192009-08-11 14:33:14 +08001605
1606 /* Insert the new leaf block with the specific offset cpos. */
1607 ret = ocfs2_insert_extent(handle, &ref_et, new_cpos, new_bh->b_blocknr,
1608 1, 0, meta_ac);
1609 if (ret)
1610 mlog_errno(ret);
1611
1612out:
1613 brelse(new_bh);
1614 return ret;
1615}
1616
1617static int ocfs2_expand_refcount_tree(handle_t *handle,
1618 struct ocfs2_caching_info *ci,
1619 struct buffer_head *ref_root_bh,
1620 struct buffer_head *ref_leaf_bh,
1621 struct ocfs2_alloc_context *meta_ac)
1622{
1623 int ret;
1624 struct buffer_head *expand_bh = NULL;
1625
1626 if (ref_root_bh == ref_leaf_bh) {
1627 /*
1628 * the old root bh hasn't been expanded to a b-tree,
1629 * so expand it first.
1630 */
1631 ret = ocfs2_expand_inline_ref_root(handle, ci, ref_root_bh,
1632 &expand_bh, meta_ac);
1633 if (ret) {
1634 mlog_errno(ret);
1635 goto out;
1636 }
1637 } else {
1638 expand_bh = ref_leaf_bh;
1639 get_bh(expand_bh);
1640 }
1641
1642
1643 /* Now add a new refcount block into the tree.*/
1644 ret = ocfs2_new_leaf_refcount_block(handle, ci, ref_root_bh,
1645 expand_bh, meta_ac);
1646 if (ret)
1647 mlog_errno(ret);
1648out:
1649 brelse(expand_bh);
1650 return ret;
1651}
1652
1653/*
1654 * Adjust the extent rec in b-tree representing ref_leaf_bh.
1655 *
1656 * Only called when we have inserted a new refcount rec at index 0
1657 * which means ocfs2_extent_rec.e_cpos may need some change.
1658 */
1659static int ocfs2_adjust_refcount_rec(handle_t *handle,
1660 struct ocfs2_caching_info *ci,
1661 struct buffer_head *ref_root_bh,
1662 struct buffer_head *ref_leaf_bh,
1663 struct ocfs2_refcount_rec *rec)
1664{
1665 int ret = 0, i;
1666 u32 new_cpos, old_cpos;
1667 struct ocfs2_path *path = NULL;
1668 struct ocfs2_extent_tree et;
1669 struct ocfs2_refcount_block *rb =
1670 (struct ocfs2_refcount_block *)ref_root_bh->b_data;
1671 struct ocfs2_extent_list *el;
1672
1673 if (!(le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL))
1674 goto out;
1675
1676 rb = (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
1677 old_cpos = le32_to_cpu(rb->rf_cpos);
1678 new_cpos = le64_to_cpu(rec->r_cpos) & OCFS2_32BIT_POS_MASK;
1679 if (old_cpos <= new_cpos)
1680 goto out;
1681
1682 ocfs2_init_refcount_extent_tree(&et, ci, ref_root_bh);
1683
1684 path = ocfs2_new_path_from_et(&et);
1685 if (!path) {
1686 ret = -ENOMEM;
1687 mlog_errno(ret);
1688 goto out;
1689 }
1690
1691 ret = ocfs2_find_path(ci, path, old_cpos);
1692 if (ret) {
1693 mlog_errno(ret);
1694 goto out;
1695 }
1696
1697 /*
1698 * 2 more credits, one for the leaf refcount block, one for
1699 * the extent block contains the extent rec.
1700 */
Tao Mac901fb02010-04-26 14:34:57 +08001701 ret = ocfs2_extend_trans(handle, 2);
Tao Mae73a8192009-08-11 14:33:14 +08001702 if (ret < 0) {
1703 mlog_errno(ret);
1704 goto out;
1705 }
1706
1707 ret = ocfs2_journal_access_rb(handle, ci, ref_leaf_bh,
1708 OCFS2_JOURNAL_ACCESS_WRITE);
1709 if (ret < 0) {
1710 mlog_errno(ret);
1711 goto out;
1712 }
1713
1714 ret = ocfs2_journal_access_eb(handle, ci, path_leaf_bh(path),
1715 OCFS2_JOURNAL_ACCESS_WRITE);
1716 if (ret < 0) {
1717 mlog_errno(ret);
1718 goto out;
1719 }
1720
1721 /* change the leaf extent block first. */
1722 el = path_leaf_el(path);
1723
1724 for (i = 0; i < le16_to_cpu(el->l_next_free_rec); i++)
1725 if (le32_to_cpu(el->l_recs[i].e_cpos) == old_cpos)
1726 break;
1727
1728 BUG_ON(i == le16_to_cpu(el->l_next_free_rec));
1729
1730 el->l_recs[i].e_cpos = cpu_to_le32(new_cpos);
1731
1732 /* change the r_cpos in the leaf block. */
1733 rb->rf_cpos = cpu_to_le32(new_cpos);
1734
1735 ocfs2_journal_dirty(handle, path_leaf_bh(path));
1736 ocfs2_journal_dirty(handle, ref_leaf_bh);
1737
1738out:
1739 ocfs2_free_path(path);
1740 return ret;
1741}
1742
1743static int ocfs2_insert_refcount_rec(handle_t *handle,
1744 struct ocfs2_caching_info *ci,
1745 struct buffer_head *ref_root_bh,
1746 struct buffer_head *ref_leaf_bh,
1747 struct ocfs2_refcount_rec *rec,
Tao Ma7540c1a2009-08-18 11:44:03 +08001748 int index, int merge,
Tao Mae73a8192009-08-11 14:33:14 +08001749 struct ocfs2_alloc_context *meta_ac)
1750{
1751 int ret;
1752 struct ocfs2_refcount_block *rb =
1753 (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
1754 struct ocfs2_refcount_list *rf_list = &rb->rf_records;
1755 struct buffer_head *new_bh = NULL;
1756
1757 BUG_ON(le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL);
1758
1759 if (rf_list->rl_used == rf_list->rl_count) {
1760 u64 cpos = le64_to_cpu(rec->r_cpos);
1761 u32 len = le32_to_cpu(rec->r_clusters);
1762
1763 ret = ocfs2_expand_refcount_tree(handle, ci, ref_root_bh,
1764 ref_leaf_bh, meta_ac);
1765 if (ret) {
1766 mlog_errno(ret);
1767 goto out;
1768 }
1769
1770 ret = ocfs2_get_refcount_rec(ci, ref_root_bh,
1771 cpos, len, NULL, &index,
1772 &new_bh);
1773 if (ret) {
1774 mlog_errno(ret);
1775 goto out;
1776 }
1777
1778 ref_leaf_bh = new_bh;
1779 rb = (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
1780 rf_list = &rb->rf_records;
1781 }
1782
1783 ret = ocfs2_journal_access_rb(handle, ci, ref_leaf_bh,
1784 OCFS2_JOURNAL_ACCESS_WRITE);
1785 if (ret) {
1786 mlog_errno(ret);
1787 goto out;
1788 }
1789
1790 if (index < le16_to_cpu(rf_list->rl_used))
1791 memmove(&rf_list->rl_recs[index + 1],
1792 &rf_list->rl_recs[index],
1793 (le16_to_cpu(rf_list->rl_used) - index) *
1794 sizeof(struct ocfs2_refcount_rec));
1795
Tao Ma198aac22011-02-22 08:20:04 +08001796 trace_ocfs2_insert_refcount_rec(
1797 (unsigned long long)ref_leaf_bh->b_blocknr, index,
1798 (unsigned long long)le64_to_cpu(rec->r_cpos),
1799 le32_to_cpu(rec->r_clusters), le32_to_cpu(rec->r_refcount));
Tao Mae73a8192009-08-11 14:33:14 +08001800
1801 rf_list->rl_recs[index] = *rec;
1802
1803 le16_add_cpu(&rf_list->rl_used, 1);
1804
Tao Ma7540c1a2009-08-18 11:44:03 +08001805 if (merge)
1806 ocfs2_refcount_rec_merge(rb, index);
Tao Mae73a8192009-08-11 14:33:14 +08001807
Joel Beckerec20cec2010-03-19 14:13:52 -07001808 ocfs2_journal_dirty(handle, ref_leaf_bh);
Tao Mae73a8192009-08-11 14:33:14 +08001809
1810 if (index == 0) {
1811 ret = ocfs2_adjust_refcount_rec(handle, ci,
1812 ref_root_bh,
1813 ref_leaf_bh, rec);
1814 if (ret)
1815 mlog_errno(ret);
1816 }
1817out:
1818 brelse(new_bh);
1819 return ret;
1820}
1821
1822/*
1823 * Split the refcount_rec indexed by "index" in ref_leaf_bh.
1824 * This is much simple than our b-tree code.
1825 * split_rec is the new refcount rec we want to insert.
1826 * If split_rec->r_refcount > 0, we are changing the refcount(in case we
1827 * increase refcount or decrease a refcount to non-zero).
1828 * If split_rec->r_refcount == 0, we are punching a hole in current refcount
1829 * rec( in case we decrease a refcount to zero).
1830 */
1831static int ocfs2_split_refcount_rec(handle_t *handle,
1832 struct ocfs2_caching_info *ci,
1833 struct buffer_head *ref_root_bh,
1834 struct buffer_head *ref_leaf_bh,
1835 struct ocfs2_refcount_rec *split_rec,
Tao Ma7540c1a2009-08-18 11:44:03 +08001836 int index, int merge,
Tao Mae73a8192009-08-11 14:33:14 +08001837 struct ocfs2_alloc_context *meta_ac,
1838 struct ocfs2_cached_dealloc_ctxt *dealloc)
1839{
1840 int ret, recs_need;
1841 u32 len;
1842 struct ocfs2_refcount_block *rb =
1843 (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
1844 struct ocfs2_refcount_list *rf_list = &rb->rf_records;
1845 struct ocfs2_refcount_rec *orig_rec = &rf_list->rl_recs[index];
1846 struct ocfs2_refcount_rec *tail_rec = NULL;
1847 struct buffer_head *new_bh = NULL;
1848
1849 BUG_ON(le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL);
1850
Tao Ma198aac22011-02-22 08:20:04 +08001851 trace_ocfs2_split_refcount_rec(le64_to_cpu(orig_rec->r_cpos),
1852 le32_to_cpu(orig_rec->r_clusters),
1853 le32_to_cpu(orig_rec->r_refcount),
1854 le64_to_cpu(split_rec->r_cpos),
1855 le32_to_cpu(split_rec->r_clusters),
1856 le32_to_cpu(split_rec->r_refcount));
Tao Mae73a8192009-08-11 14:33:14 +08001857
1858 /*
1859 * If we just need to split the header or tail clusters,
1860 * no more recs are needed, just split is OK.
1861 * Otherwise we at least need one new recs.
1862 */
1863 if (!split_rec->r_refcount &&
1864 (split_rec->r_cpos == orig_rec->r_cpos ||
1865 le64_to_cpu(split_rec->r_cpos) +
1866 le32_to_cpu(split_rec->r_clusters) ==
1867 le64_to_cpu(orig_rec->r_cpos) + le32_to_cpu(orig_rec->r_clusters)))
1868 recs_need = 0;
1869 else
1870 recs_need = 1;
1871
1872 /*
1873 * We need one more rec if we split in the middle and the new rec have
1874 * some refcount in it.
1875 */
1876 if (split_rec->r_refcount &&
1877 (split_rec->r_cpos != orig_rec->r_cpos &&
1878 le64_to_cpu(split_rec->r_cpos) +
1879 le32_to_cpu(split_rec->r_clusters) !=
1880 le64_to_cpu(orig_rec->r_cpos) + le32_to_cpu(orig_rec->r_clusters)))
1881 recs_need++;
1882
1883 /* If the leaf block don't have enough record, expand it. */
Tao Ma12d4cec2009-11-30 15:08:40 +08001884 if (le16_to_cpu(rf_list->rl_used) + recs_need >
1885 le16_to_cpu(rf_list->rl_count)) {
Tao Mae73a8192009-08-11 14:33:14 +08001886 struct ocfs2_refcount_rec tmp_rec;
1887 u64 cpos = le64_to_cpu(orig_rec->r_cpos);
1888 len = le32_to_cpu(orig_rec->r_clusters);
1889 ret = ocfs2_expand_refcount_tree(handle, ci, ref_root_bh,
1890 ref_leaf_bh, meta_ac);
1891 if (ret) {
1892 mlog_errno(ret);
1893 goto out;
1894 }
1895
1896 /*
1897 * We have to re-get it since now cpos may be moved to
1898 * another leaf block.
1899 */
1900 ret = ocfs2_get_refcount_rec(ci, ref_root_bh,
1901 cpos, len, &tmp_rec, &index,
1902 &new_bh);
1903 if (ret) {
1904 mlog_errno(ret);
1905 goto out;
1906 }
1907
1908 ref_leaf_bh = new_bh;
1909 rb = (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
1910 rf_list = &rb->rf_records;
1911 orig_rec = &rf_list->rl_recs[index];
1912 }
1913
1914 ret = ocfs2_journal_access_rb(handle, ci, ref_leaf_bh,
1915 OCFS2_JOURNAL_ACCESS_WRITE);
1916 if (ret) {
1917 mlog_errno(ret);
1918 goto out;
1919 }
1920
1921 /*
1922 * We have calculated out how many new records we need and store
1923 * in recs_need, so spare enough space first by moving the records
1924 * after "index" to the end.
1925 */
1926 if (index != le16_to_cpu(rf_list->rl_used) - 1)
1927 memmove(&rf_list->rl_recs[index + 1 + recs_need],
1928 &rf_list->rl_recs[index + 1],
1929 (le16_to_cpu(rf_list->rl_used) - index - 1) *
1930 sizeof(struct ocfs2_refcount_rec));
1931
1932 len = (le64_to_cpu(orig_rec->r_cpos) +
1933 le32_to_cpu(orig_rec->r_clusters)) -
1934 (le64_to_cpu(split_rec->r_cpos) +
1935 le32_to_cpu(split_rec->r_clusters));
1936
1937 /*
1938 * If we have "len", the we will split in the tail and move it
1939 * to the end of the space we have just spared.
1940 */
1941 if (len) {
1942 tail_rec = &rf_list->rl_recs[index + recs_need];
1943
1944 memcpy(tail_rec, orig_rec, sizeof(struct ocfs2_refcount_rec));
1945 le64_add_cpu(&tail_rec->r_cpos,
1946 le32_to_cpu(tail_rec->r_clusters) - len);
Tao Ma12d4cec2009-11-30 15:08:40 +08001947 tail_rec->r_clusters = cpu_to_le32(len);
Tao Mae73a8192009-08-11 14:33:14 +08001948 }
1949
1950 /*
1951 * If the split pos isn't the same as the original one, we need to
1952 * split in the head.
1953 *
1954 * Note: We have the chance that split_rec.r_refcount = 0,
1955 * recs_need = 0 and len > 0, which means we just cut the head from
1956 * the orig_rec and in that case we have done some modification in
1957 * orig_rec above, so the check for r_cpos is faked.
1958 */
1959 if (split_rec->r_cpos != orig_rec->r_cpos && tail_rec != orig_rec) {
1960 len = le64_to_cpu(split_rec->r_cpos) -
1961 le64_to_cpu(orig_rec->r_cpos);
1962 orig_rec->r_clusters = cpu_to_le32(len);
1963 index++;
1964 }
1965
1966 le16_add_cpu(&rf_list->rl_used, recs_need);
1967
1968 if (split_rec->r_refcount) {
1969 rf_list->rl_recs[index] = *split_rec;
Tao Ma198aac22011-02-22 08:20:04 +08001970 trace_ocfs2_split_refcount_rec_insert(
1971 (unsigned long long)ref_leaf_bh->b_blocknr, index,
1972 (unsigned long long)le64_to_cpu(split_rec->r_cpos),
1973 le32_to_cpu(split_rec->r_clusters),
1974 le32_to_cpu(split_rec->r_refcount));
Tao Mae73a8192009-08-11 14:33:14 +08001975
Tao Ma7540c1a2009-08-18 11:44:03 +08001976 if (merge)
1977 ocfs2_refcount_rec_merge(rb, index);
Tao Mae73a8192009-08-11 14:33:14 +08001978 }
1979
Joel Beckerec20cec2010-03-19 14:13:52 -07001980 ocfs2_journal_dirty(handle, ref_leaf_bh);
Tao Mae73a8192009-08-11 14:33:14 +08001981
1982out:
1983 brelse(new_bh);
1984 return ret;
1985}
1986
Tao Ma7540c1a2009-08-18 11:44:03 +08001987static int __ocfs2_increase_refcount(handle_t *handle,
1988 struct ocfs2_caching_info *ci,
1989 struct buffer_head *ref_root_bh,
1990 u64 cpos, u32 len, int merge,
1991 struct ocfs2_alloc_context *meta_ac,
1992 struct ocfs2_cached_dealloc_ctxt *dealloc)
Tao Mae73a8192009-08-11 14:33:14 +08001993{
1994 int ret = 0, index;
1995 struct buffer_head *ref_leaf_bh = NULL;
1996 struct ocfs2_refcount_rec rec;
1997 unsigned int set_len = 0;
1998
Tao Ma198aac22011-02-22 08:20:04 +08001999 trace_ocfs2_increase_refcount_begin(
Tao Mae73a8192009-08-11 14:33:14 +08002000 (unsigned long long)ocfs2_metadata_cache_owner(ci),
2001 (unsigned long long)cpos, len);
2002
2003 while (len) {
2004 ret = ocfs2_get_refcount_rec(ci, ref_root_bh,
2005 cpos, len, &rec, &index,
2006 &ref_leaf_bh);
2007 if (ret) {
2008 mlog_errno(ret);
2009 goto out;
2010 }
2011
2012 set_len = le32_to_cpu(rec.r_clusters);
2013
2014 /*
2015 * Here we may meet with 3 situations:
2016 *
2017 * 1. If we find an already existing record, and the length
2018 * is the same, cool, we just need to increase the r_refcount
2019 * and it is OK.
2020 * 2. If we find a hole, just insert it with r_refcount = 1.
2021 * 3. If we are in the middle of one extent record, split
2022 * it.
2023 */
2024 if (rec.r_refcount && le64_to_cpu(rec.r_cpos) == cpos &&
2025 set_len <= len) {
Tao Ma198aac22011-02-22 08:20:04 +08002026 trace_ocfs2_increase_refcount_change(
2027 (unsigned long long)cpos, set_len,
2028 le32_to_cpu(rec.r_refcount));
Tao Mae73a8192009-08-11 14:33:14 +08002029 ret = ocfs2_change_refcount_rec(handle, ci,
Tao Ma7540c1a2009-08-18 11:44:03 +08002030 ref_leaf_bh, index,
2031 merge, 1);
Tao Mae73a8192009-08-11 14:33:14 +08002032 if (ret) {
2033 mlog_errno(ret);
2034 goto out;
2035 }
2036 } else if (!rec.r_refcount) {
2037 rec.r_refcount = cpu_to_le32(1);
2038
Tao Ma198aac22011-02-22 08:20:04 +08002039 trace_ocfs2_increase_refcount_insert(
Tao Mae73a8192009-08-11 14:33:14 +08002040 (unsigned long long)le64_to_cpu(rec.r_cpos),
2041 set_len);
2042 ret = ocfs2_insert_refcount_rec(handle, ci, ref_root_bh,
2043 ref_leaf_bh,
Tao Ma7540c1a2009-08-18 11:44:03 +08002044 &rec, index,
2045 merge, meta_ac);
Tao Mae73a8192009-08-11 14:33:14 +08002046 if (ret) {
2047 mlog_errno(ret);
2048 goto out;
2049 }
2050 } else {
2051 set_len = min((u64)(cpos + len),
2052 le64_to_cpu(rec.r_cpos) + set_len) - cpos;
2053 rec.r_cpos = cpu_to_le64(cpos);
2054 rec.r_clusters = cpu_to_le32(set_len);
2055 le32_add_cpu(&rec.r_refcount, 1);
2056
Tao Ma198aac22011-02-22 08:20:04 +08002057 trace_ocfs2_increase_refcount_split(
Tao Mae73a8192009-08-11 14:33:14 +08002058 (unsigned long long)le64_to_cpu(rec.r_cpos),
2059 set_len, le32_to_cpu(rec.r_refcount));
2060 ret = ocfs2_split_refcount_rec(handle, ci,
2061 ref_root_bh, ref_leaf_bh,
Tao Ma7540c1a2009-08-18 11:44:03 +08002062 &rec, index, merge,
Tao Mae73a8192009-08-11 14:33:14 +08002063 meta_ac, dealloc);
2064 if (ret) {
2065 mlog_errno(ret);
2066 goto out;
2067 }
2068 }
2069
2070 cpos += set_len;
2071 len -= set_len;
2072 brelse(ref_leaf_bh);
2073 ref_leaf_bh = NULL;
2074 }
2075
2076out:
2077 brelse(ref_leaf_bh);
2078 return ret;
2079}
Tao Ma1823cb02009-08-18 11:24:49 +08002080
2081static int ocfs2_remove_refcount_extent(handle_t *handle,
2082 struct ocfs2_caching_info *ci,
2083 struct buffer_head *ref_root_bh,
2084 struct buffer_head *ref_leaf_bh,
2085 struct ocfs2_alloc_context *meta_ac,
2086 struct ocfs2_cached_dealloc_ctxt *dealloc)
2087{
2088 int ret;
2089 struct super_block *sb = ocfs2_metadata_cache_get_super(ci);
2090 struct ocfs2_refcount_block *rb =
2091 (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
2092 struct ocfs2_extent_tree et;
2093
2094 BUG_ON(rb->rf_records.rl_used);
2095
Tao Ma198aac22011-02-22 08:20:04 +08002096 trace_ocfs2_remove_refcount_extent(
2097 (unsigned long long)ocfs2_metadata_cache_owner(ci),
2098 (unsigned long long)ref_leaf_bh->b_blocknr,
2099 le32_to_cpu(rb->rf_cpos));
2100
Tao Ma1823cb02009-08-18 11:24:49 +08002101 ocfs2_init_refcount_extent_tree(&et, ci, ref_root_bh);
2102 ret = ocfs2_remove_extent(handle, &et, le32_to_cpu(rb->rf_cpos),
2103 1, meta_ac, dealloc);
2104 if (ret) {
2105 mlog_errno(ret);
2106 goto out;
2107 }
2108
2109 ocfs2_remove_from_cache(ci, ref_leaf_bh);
2110
2111 /*
2112 * add the freed block to the dealloc so that it will be freed
2113 * when we run dealloc.
2114 */
2115 ret = ocfs2_cache_block_dealloc(dealloc, EXTENT_ALLOC_SYSTEM_INODE,
2116 le16_to_cpu(rb->rf_suballoc_slot),
Tao Ma74380c42010-03-22 14:20:18 +08002117 le64_to_cpu(rb->rf_suballoc_loc),
Tao Ma1823cb02009-08-18 11:24:49 +08002118 le64_to_cpu(rb->rf_blkno),
2119 le16_to_cpu(rb->rf_suballoc_bit));
2120 if (ret) {
2121 mlog_errno(ret);
2122 goto out;
2123 }
2124
2125 ret = ocfs2_journal_access_rb(handle, ci, ref_root_bh,
2126 OCFS2_JOURNAL_ACCESS_WRITE);
2127 if (ret) {
2128 mlog_errno(ret);
2129 goto out;
2130 }
2131
2132 rb = (struct ocfs2_refcount_block *)ref_root_bh->b_data;
2133
2134 le32_add_cpu(&rb->rf_clusters, -1);
2135
2136 /*
2137 * check whether we need to restore the root refcount block if
2138 * there is no leaf extent block at atll.
2139 */
2140 if (!rb->rf_list.l_next_free_rec) {
2141 BUG_ON(rb->rf_clusters);
2142
Tao Ma198aac22011-02-22 08:20:04 +08002143 trace_ocfs2_restore_refcount_block(
Tao Ma1823cb02009-08-18 11:24:49 +08002144 (unsigned long long)ref_root_bh->b_blocknr);
2145
2146 rb->rf_flags = 0;
2147 rb->rf_parent = 0;
2148 rb->rf_cpos = 0;
2149 memset(&rb->rf_records, 0, sb->s_blocksize -
2150 offsetof(struct ocfs2_refcount_block, rf_records));
2151 rb->rf_records.rl_count =
2152 cpu_to_le16(ocfs2_refcount_recs_per_rb(sb));
2153 }
2154
2155 ocfs2_journal_dirty(handle, ref_root_bh);
2156
2157out:
2158 return ret;
2159}
2160
Tao Ma7540c1a2009-08-18 11:44:03 +08002161int ocfs2_increase_refcount(handle_t *handle,
2162 struct ocfs2_caching_info *ci,
2163 struct buffer_head *ref_root_bh,
2164 u64 cpos, u32 len,
2165 struct ocfs2_alloc_context *meta_ac,
2166 struct ocfs2_cached_dealloc_ctxt *dealloc)
2167{
2168 return __ocfs2_increase_refcount(handle, ci, ref_root_bh,
2169 cpos, len, 1,
2170 meta_ac, dealloc);
2171}
2172
Tao Ma1823cb02009-08-18 11:24:49 +08002173static int ocfs2_decrease_refcount_rec(handle_t *handle,
2174 struct ocfs2_caching_info *ci,
2175 struct buffer_head *ref_root_bh,
2176 struct buffer_head *ref_leaf_bh,
2177 int index, u64 cpos, unsigned int len,
2178 struct ocfs2_alloc_context *meta_ac,
2179 struct ocfs2_cached_dealloc_ctxt *dealloc)
2180{
2181 int ret;
2182 struct ocfs2_refcount_block *rb =
2183 (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
2184 struct ocfs2_refcount_rec *rec = &rb->rf_records.rl_recs[index];
2185
2186 BUG_ON(cpos < le64_to_cpu(rec->r_cpos));
2187 BUG_ON(cpos + len >
2188 le64_to_cpu(rec->r_cpos) + le32_to_cpu(rec->r_clusters));
2189
Tao Ma198aac22011-02-22 08:20:04 +08002190 trace_ocfs2_decrease_refcount_rec(
2191 (unsigned long long)ocfs2_metadata_cache_owner(ci),
2192 (unsigned long long)cpos, len);
2193
Tao Ma1823cb02009-08-18 11:24:49 +08002194 if (cpos == le64_to_cpu(rec->r_cpos) &&
2195 len == le32_to_cpu(rec->r_clusters))
2196 ret = ocfs2_change_refcount_rec(handle, ci,
Tao Ma7540c1a2009-08-18 11:44:03 +08002197 ref_leaf_bh, index, 1, -1);
Tao Ma1823cb02009-08-18 11:24:49 +08002198 else {
2199 struct ocfs2_refcount_rec split = *rec;
2200 split.r_cpos = cpu_to_le64(cpos);
2201 split.r_clusters = cpu_to_le32(len);
2202
2203 le32_add_cpu(&split.r_refcount, -1);
2204
Tao Ma1823cb02009-08-18 11:24:49 +08002205 ret = ocfs2_split_refcount_rec(handle, ci,
2206 ref_root_bh, ref_leaf_bh,
Tao Ma7540c1a2009-08-18 11:44:03 +08002207 &split, index, 1,
Tao Ma1823cb02009-08-18 11:24:49 +08002208 meta_ac, dealloc);
2209 }
2210
2211 if (ret) {
2212 mlog_errno(ret);
2213 goto out;
2214 }
2215
2216 /* Remove the leaf refcount block if it contains no refcount record. */
2217 if (!rb->rf_records.rl_used && ref_leaf_bh != ref_root_bh) {
2218 ret = ocfs2_remove_refcount_extent(handle, ci, ref_root_bh,
2219 ref_leaf_bh, meta_ac,
2220 dealloc);
2221 if (ret)
2222 mlog_errno(ret);
2223 }
2224
2225out:
2226 return ret;
2227}
2228
2229static int __ocfs2_decrease_refcount(handle_t *handle,
2230 struct ocfs2_caching_info *ci,
2231 struct buffer_head *ref_root_bh,
2232 u64 cpos, u32 len,
2233 struct ocfs2_alloc_context *meta_ac,
Tao Ma6ae23c52009-08-18 11:30:55 +08002234 struct ocfs2_cached_dealloc_ctxt *dealloc,
2235 int delete)
Tao Ma1823cb02009-08-18 11:24:49 +08002236{
2237 int ret = 0, index = 0;
2238 struct ocfs2_refcount_rec rec;
2239 unsigned int r_count = 0, r_len;
2240 struct super_block *sb = ocfs2_metadata_cache_get_super(ci);
2241 struct buffer_head *ref_leaf_bh = NULL;
2242
Tao Ma198aac22011-02-22 08:20:04 +08002243 trace_ocfs2_decrease_refcount(
2244 (unsigned long long)ocfs2_metadata_cache_owner(ci),
2245 (unsigned long long)cpos, len, delete);
Tao Ma1823cb02009-08-18 11:24:49 +08002246
2247 while (len) {
2248 ret = ocfs2_get_refcount_rec(ci, ref_root_bh,
2249 cpos, len, &rec, &index,
2250 &ref_leaf_bh);
2251 if (ret) {
2252 mlog_errno(ret);
2253 goto out;
2254 }
2255
2256 r_count = le32_to_cpu(rec.r_refcount);
2257 BUG_ON(r_count == 0);
Tao Ma6ae23c52009-08-18 11:30:55 +08002258 if (!delete)
2259 BUG_ON(r_count > 1);
Tao Ma1823cb02009-08-18 11:24:49 +08002260
2261 r_len = min((u64)(cpos + len), le64_to_cpu(rec.r_cpos) +
2262 le32_to_cpu(rec.r_clusters)) - cpos;
2263
2264 ret = ocfs2_decrease_refcount_rec(handle, ci, ref_root_bh,
2265 ref_leaf_bh, index,
2266 cpos, r_len,
2267 meta_ac, dealloc);
2268 if (ret) {
2269 mlog_errno(ret);
2270 goto out;
2271 }
2272
Tao Ma6ae23c52009-08-18 11:30:55 +08002273 if (le32_to_cpu(rec.r_refcount) == 1 && delete) {
Tao Ma1823cb02009-08-18 11:24:49 +08002274 ret = ocfs2_cache_cluster_dealloc(dealloc,
2275 ocfs2_clusters_to_blocks(sb, cpos),
2276 r_len);
2277 if (ret) {
2278 mlog_errno(ret);
2279 goto out;
2280 }
2281 }
2282
2283 cpos += r_len;
2284 len -= r_len;
2285 brelse(ref_leaf_bh);
2286 ref_leaf_bh = NULL;
2287 }
2288
2289out:
2290 brelse(ref_leaf_bh);
2291 return ret;
2292}
2293
2294/* Caller must hold refcount tree lock. */
2295int ocfs2_decrease_refcount(struct inode *inode,
2296 handle_t *handle, u32 cpos, u32 len,
2297 struct ocfs2_alloc_context *meta_ac,
Tao Ma6ae23c52009-08-18 11:30:55 +08002298 struct ocfs2_cached_dealloc_ctxt *dealloc,
2299 int delete)
Tao Ma1823cb02009-08-18 11:24:49 +08002300{
2301 int ret;
2302 u64 ref_blkno;
2303 struct ocfs2_inode_info *oi = OCFS2_I(inode);
2304 struct buffer_head *ref_root_bh = NULL;
2305 struct ocfs2_refcount_tree *tree;
2306
2307 BUG_ON(!(oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL));
2308
2309 ret = ocfs2_get_refcount_block(inode, &ref_blkno);
2310 if (ret) {
2311 mlog_errno(ret);
2312 goto out;
2313 }
2314
2315 ret = ocfs2_get_refcount_tree(OCFS2_SB(inode->i_sb), ref_blkno, &tree);
2316 if (ret) {
2317 mlog_errno(ret);
2318 goto out;
2319 }
2320
2321 ret = ocfs2_read_refcount_block(&tree->rf_ci, tree->rf_blkno,
2322 &ref_root_bh);
2323 if (ret) {
2324 mlog_errno(ret);
2325 goto out;
2326 }
2327
2328 ret = __ocfs2_decrease_refcount(handle, &tree->rf_ci, ref_root_bh,
Tao Ma6ae23c52009-08-18 11:30:55 +08002329 cpos, len, meta_ac, dealloc, delete);
Tao Ma1823cb02009-08-18 11:24:49 +08002330 if (ret)
2331 mlog_errno(ret);
2332out:
2333 brelse(ref_root_bh);
2334 return ret;
2335}
Tao Ma1aa75fe2009-08-18 11:28:39 +08002336
2337/*
2338 * Mark the already-existing extent at cpos as refcounted for len clusters.
2339 * This adds the refcount extent flag.
2340 *
2341 * If the existing extent is larger than the request, initiate a
2342 * split. An attempt will be made at merging with adjacent extents.
2343 *
2344 * The caller is responsible for passing down meta_ac if we'll need it.
2345 */
2346static int ocfs2_mark_extent_refcounted(struct inode *inode,
2347 struct ocfs2_extent_tree *et,
2348 handle_t *handle, u32 cpos,
2349 u32 len, u32 phys,
2350 struct ocfs2_alloc_context *meta_ac,
2351 struct ocfs2_cached_dealloc_ctxt *dealloc)
2352{
2353 int ret;
2354
Tao Ma198aac22011-02-22 08:20:04 +08002355 trace_ocfs2_mark_extent_refcounted(OCFS2_I(inode)->ip_blkno,
2356 cpos, len, phys);
Tao Ma1aa75fe2009-08-18 11:28:39 +08002357
2358 if (!ocfs2_refcount_tree(OCFS2_SB(inode->i_sb))) {
2359 ocfs2_error(inode->i_sb, "Inode %lu want to use refcount "
2360 "tree, but the feature bit is not set in the "
2361 "super block.", inode->i_ino);
2362 ret = -EROFS;
2363 goto out;
2364 }
2365
2366 ret = ocfs2_change_extent_flag(handle, et, cpos,
2367 len, phys, meta_ac, dealloc,
2368 OCFS2_EXT_REFCOUNTED, 0);
2369 if (ret)
2370 mlog_errno(ret);
2371
2372out:
2373 return ret;
2374}
Tao Mabcbbb242009-08-18 11:29:12 +08002375
2376/*
2377 * Given some contiguous physical clusters, calculate what we need
2378 * for modifying their refcount.
2379 */
2380static int ocfs2_calc_refcount_meta_credits(struct super_block *sb,
2381 struct ocfs2_caching_info *ci,
2382 struct buffer_head *ref_root_bh,
2383 u64 start_cpos,
2384 u32 clusters,
2385 int *meta_add,
2386 int *credits)
2387{
2388 int ret = 0, index, ref_blocks = 0, recs_add = 0;
2389 u64 cpos = start_cpos;
2390 struct ocfs2_refcount_block *rb;
2391 struct ocfs2_refcount_rec rec;
2392 struct buffer_head *ref_leaf_bh = NULL, *prev_bh = NULL;
2393 u32 len;
2394
Tao Mabcbbb242009-08-18 11:29:12 +08002395 while (clusters) {
2396 ret = ocfs2_get_refcount_rec(ci, ref_root_bh,
2397 cpos, clusters, &rec,
2398 &index, &ref_leaf_bh);
2399 if (ret) {
2400 mlog_errno(ret);
2401 goto out;
2402 }
2403
2404 if (ref_leaf_bh != prev_bh) {
2405 /*
2406 * Now we encounter a new leaf block, so calculate
2407 * whether we need to extend the old leaf.
2408 */
2409 if (prev_bh) {
2410 rb = (struct ocfs2_refcount_block *)
2411 prev_bh->b_data;
2412
Al Viroe1bf4cc2012-04-13 12:27:11 -04002413 if (le16_to_cpu(rb->rf_records.rl_used) +
Tao Mabcbbb242009-08-18 11:29:12 +08002414 recs_add >
2415 le16_to_cpu(rb->rf_records.rl_count))
2416 ref_blocks++;
2417 }
2418
2419 recs_add = 0;
2420 *credits += 1;
2421 brelse(prev_bh);
2422 prev_bh = ref_leaf_bh;
2423 get_bh(prev_bh);
2424 }
2425
2426 rb = (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
2427
Tao Ma198aac22011-02-22 08:20:04 +08002428 trace_ocfs2_calc_refcount_meta_credits_iterate(
2429 recs_add, (unsigned long long)cpos, clusters,
2430 (unsigned long long)le64_to_cpu(rec.r_cpos),
2431 le32_to_cpu(rec.r_clusters),
2432 le32_to_cpu(rec.r_refcount), index);
Tao Mabcbbb242009-08-18 11:29:12 +08002433
2434 len = min((u64)cpos + clusters, le64_to_cpu(rec.r_cpos) +
2435 le32_to_cpu(rec.r_clusters)) - cpos;
2436 /*
Tao Mabcbbb242009-08-18 11:29:12 +08002437 * We record all the records which will be inserted to the
2438 * same refcount block, so that we can tell exactly whether
2439 * we need a new refcount block or not.
Tao Ma8a2e70c2010-07-22 13:56:45 +08002440 *
2441 * If we will insert a new one, this is easy and only happens
2442 * during adding refcounted flag to the extent, so we don't
2443 * have a chance of spliting. We just need one record.
2444 *
2445 * If the refcount rec already exists, that would be a little
2446 * complicated. we may have to:
2447 * 1) split at the beginning if the start pos isn't aligned.
2448 * we need 1 more record in this case.
2449 * 2) split int the end if the end pos isn't aligned.
2450 * we need 1 more record in this case.
2451 * 3) split in the middle because of file system fragmentation.
2452 * we need 2 more records in this case(we can't detect this
2453 * beforehand, so always think of the worst case).
Tao Mabcbbb242009-08-18 11:29:12 +08002454 */
2455 if (rec.r_refcount) {
Tao Ma8a2e70c2010-07-22 13:56:45 +08002456 recs_add += 2;
Tao Mabcbbb242009-08-18 11:29:12 +08002457 /* Check whether we need a split at the beginning. */
2458 if (cpos == start_cpos &&
2459 cpos != le64_to_cpu(rec.r_cpos))
2460 recs_add++;
2461
2462 /* Check whether we need a split in the end. */
2463 if (cpos + clusters < le64_to_cpu(rec.r_cpos) +
2464 le32_to_cpu(rec.r_clusters))
2465 recs_add++;
2466 } else
2467 recs_add++;
2468
2469 brelse(ref_leaf_bh);
2470 ref_leaf_bh = NULL;
2471 clusters -= len;
2472 cpos += len;
2473 }
2474
2475 if (prev_bh) {
2476 rb = (struct ocfs2_refcount_block *)prev_bh->b_data;
2477
Al Viroe1bf4cc2012-04-13 12:27:11 -04002478 if (le16_to_cpu(rb->rf_records.rl_used) + recs_add >
Tao Mabcbbb242009-08-18 11:29:12 +08002479 le16_to_cpu(rb->rf_records.rl_count))
2480 ref_blocks++;
2481
2482 *credits += 1;
2483 }
2484
2485 if (!ref_blocks)
2486 goto out;
2487
Tao Mabcbbb242009-08-18 11:29:12 +08002488 *meta_add += ref_blocks;
2489 *credits += ref_blocks;
2490
2491 /*
2492 * So we may need ref_blocks to insert into the tree.
2493 * That also means we need to change the b-tree and add that number
2494 * of records since we never merge them.
2495 * We need one more block for expansion since the new created leaf
2496 * block is also full and needs split.
2497 */
2498 rb = (struct ocfs2_refcount_block *)ref_root_bh->b_data;
2499 if (le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL) {
2500 struct ocfs2_extent_tree et;
2501
2502 ocfs2_init_refcount_extent_tree(&et, ci, ref_root_bh);
2503 *meta_add += ocfs2_extend_meta_needed(et.et_root_el);
2504 *credits += ocfs2_calc_extend_credits(sb,
2505 et.et_root_el,
2506 ref_blocks);
2507 } 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
2877 *credits += ocfs2_calc_extend_credits(sb, et->et_root_el,
2878 num_clusters + 2);
2879
2880 ret = ocfs2_calc_refcount_meta_credits(sb, ref_ci, ref_root_bh,
2881 p_cluster, num_clusters,
2882 &meta_add, credits);
2883 if (ret) {
2884 mlog_errno(ret);
2885 goto out;
2886 }
2887
Tao Ma198aac22011-02-22 08:20:04 +08002888 trace_ocfs2_lock_refcount_allocators(meta_add, *credits);
Tao Ma6f70fa52009-08-25 08:05:12 +08002889 ret = ocfs2_reserve_new_metadata_blocks(OCFS2_SB(sb), meta_add,
2890 meta_ac);
2891 if (ret) {
2892 mlog_errno(ret);
2893 goto out;
2894 }
2895
2896 if (data_ac) {
2897 ret = ocfs2_reserve_clusters(OCFS2_SB(sb), num_clusters,
2898 data_ac);
2899 if (ret)
2900 mlog_errno(ret);
2901 }
2902
2903out:
2904 if (ret) {
2905 if (*meta_ac) {
2906 ocfs2_free_alloc_context(*meta_ac);
2907 *meta_ac = NULL;
2908 }
2909 }
2910
2911 return ret;
2912}
2913
2914static int ocfs2_clear_cow_buffer(handle_t *handle, struct buffer_head *bh)
2915{
2916 BUG_ON(buffer_dirty(bh));
2917
2918 clear_buffer_mapped(bh);
2919
2920 return 0;
2921}
2922
Tristan Ye3e19a252011-05-24 16:21:20 +08002923int ocfs2_duplicate_clusters_by_page(handle_t *handle,
Tiger Yangc7dd3392013-08-13 16:00:58 -07002924 struct inode *inode,
Tristan Ye3e19a252011-05-24 16:21:20 +08002925 u32 cpos, u32 old_cluster,
2926 u32 new_cluster, u32 new_len)
Tao Ma6f70fa52009-08-25 08:05:12 +08002927{
2928 int ret = 0, partial;
Tiger Yangc7dd3392013-08-13 16:00:58 -07002929 struct super_block *sb = inode->i_sb;
Tao Ma6f70fa52009-08-25 08:05:12 +08002930 u64 new_block = ocfs2_clusters_to_blocks(sb, new_cluster);
2931 struct page *page;
2932 pgoff_t page_index;
Tao Ma6ea4843f2010-08-12 10:31:34 +08002933 unsigned int from, to, readahead_pages;
Tao Ma6f70fa52009-08-25 08:05:12 +08002934 loff_t offset, end, map_end;
Tristan Ye3e19a252011-05-24 16:21:20 +08002935 struct address_space *mapping = inode->i_mapping;
Tao Ma6f70fa52009-08-25 08:05:12 +08002936
Tao Ma198aac22011-02-22 08:20:04 +08002937 trace_ocfs2_duplicate_clusters_by_page(cpos, old_cluster,
2938 new_cluster, new_len);
Tao Ma6f70fa52009-08-25 08:05:12 +08002939
Tao Ma6ea4843f2010-08-12 10:31:34 +08002940 readahead_pages =
2941 (ocfs2_cow_contig_clusters(sb) <<
2942 OCFS2_SB(sb)->s_clustersize_bits) >> PAGE_CACHE_SHIFT;
Tao Ma6f70fa52009-08-25 08:05:12 +08002943 offset = ((loff_t)cpos) << OCFS2_SB(sb)->s_clustersize_bits;
2944 end = offset + (new_len << OCFS2_SB(sb)->s_clustersize_bits);
Tao Maf5e27b62010-07-14 11:19:32 +08002945 /*
2946 * We only duplicate pages until we reach the page contains i_size - 1.
2947 * So trim 'end' to i_size.
2948 */
Tristan Ye3e19a252011-05-24 16:21:20 +08002949 if (end > i_size_read(inode))
2950 end = i_size_read(inode);
Tao Ma6f70fa52009-08-25 08:05:12 +08002951
2952 while (offset < end) {
2953 page_index = offset >> PAGE_CACHE_SHIFT;
Tao Mad622b892010-01-30 23:32:19 +08002954 map_end = ((loff_t)page_index + 1) << PAGE_CACHE_SHIFT;
Tao Ma6f70fa52009-08-25 08:05:12 +08002955 if (map_end > end)
2956 map_end = end;
2957
2958 /* from, to is the offset within the page. */
2959 from = offset & (PAGE_CACHE_SIZE - 1);
2960 to = PAGE_CACHE_SIZE;
2961 if (map_end & (PAGE_CACHE_SIZE - 1))
2962 to = map_end & (PAGE_CACHE_SIZE - 1);
2963
Jan Kara9b4c0ff2010-08-24 14:28:03 +02002964 page = find_or_create_page(mapping, page_index, GFP_NOFS);
Gu Zheng62c61042013-07-31 13:53:29 -07002965 if (!page) {
2966 ret = -ENOMEM;
2967 mlog_errno(ret);
2968 break;
2969 }
Tao Ma6f70fa52009-08-25 08:05:12 +08002970
Tao Ma0a1ea432010-02-01 17:05:33 +08002971 /*
2972 * In case PAGE_CACHE_SIZE <= CLUSTER_SIZE, This page
2973 * can't be dirtied before we CoW it out.
2974 */
2975 if (PAGE_CACHE_SIZE <= OCFS2_SB(sb)->s_clustersize)
2976 BUG_ON(PageDirty(page));
Tao Ma6f70fa52009-08-25 08:05:12 +08002977
2978 if (!PageUptodate(page)) {
2979 ret = block_read_full_page(page, ocfs2_get_block);
2980 if (ret) {
2981 mlog_errno(ret);
2982 goto unlock;
2983 }
2984 lock_page(page);
2985 }
2986
2987 if (page_has_buffers(page)) {
2988 ret = walk_page_buffers(handle, page_buffers(page),
2989 from, to, &partial,
2990 ocfs2_clear_cow_buffer);
2991 if (ret) {
2992 mlog_errno(ret);
2993 goto unlock;
2994 }
2995 }
2996
Tiger Yangc7dd3392013-08-13 16:00:58 -07002997 ocfs2_map_and_dirty_page(inode,
2998 handle, from, to,
Tao Ma6f70fa52009-08-25 08:05:12 +08002999 page, 0, &new_block);
3000 mark_page_accessed(page);
3001unlock:
3002 unlock_page(page);
3003 page_cache_release(page);
3004 page = NULL;
3005 offset = map_end;
3006 if (ret)
3007 break;
3008 }
3009
3010 return ret;
3011}
3012
Tristan Ye3e19a252011-05-24 16:21:20 +08003013int ocfs2_duplicate_clusters_by_jbd(handle_t *handle,
Tiger Yangc7dd3392013-08-13 16:00:58 -07003014 struct inode *inode,
Tristan Ye3e19a252011-05-24 16:21:20 +08003015 u32 cpos, u32 old_cluster,
3016 u32 new_cluster, u32 new_len)
Tao Ma492a8a32009-08-18 11:43:17 +08003017{
3018 int ret = 0;
Tristan Ye3e19a252011-05-24 16:21:20 +08003019 struct super_block *sb = inode->i_sb;
3020 struct ocfs2_caching_info *ci = INODE_CACHE(inode);
Tao Ma492a8a32009-08-18 11:43:17 +08003021 int i, blocks = ocfs2_clusters_to_blocks(sb, new_len);
3022 u64 old_block = ocfs2_clusters_to_blocks(sb, old_cluster);
3023 u64 new_block = ocfs2_clusters_to_blocks(sb, new_cluster);
3024 struct ocfs2_super *osb = OCFS2_SB(sb);
3025 struct buffer_head *old_bh = NULL;
3026 struct buffer_head *new_bh = NULL;
3027
Tao Ma198aac22011-02-22 08:20:04 +08003028 trace_ocfs2_duplicate_clusters_by_page(cpos, old_cluster,
3029 new_cluster, new_len);
Tao Ma492a8a32009-08-18 11:43:17 +08003030
3031 for (i = 0; i < blocks; i++, old_block++, new_block++) {
3032 new_bh = sb_getblk(osb->sb, new_block);
3033 if (new_bh == NULL) {
3034 ret = -EIO;
3035 mlog_errno(ret);
3036 break;
3037 }
3038
3039 ocfs2_set_new_buffer_uptodate(ci, new_bh);
3040
3041 ret = ocfs2_read_block(ci, old_block, &old_bh, NULL);
3042 if (ret) {
3043 mlog_errno(ret);
3044 break;
3045 }
3046
3047 ret = ocfs2_journal_access(handle, ci, new_bh,
3048 OCFS2_JOURNAL_ACCESS_CREATE);
3049 if (ret) {
3050 mlog_errno(ret);
3051 break;
3052 }
3053
3054 memcpy(new_bh->b_data, old_bh->b_data, sb->s_blocksize);
Joel Beckerec20cec2010-03-19 14:13:52 -07003055 ocfs2_journal_dirty(handle, new_bh);
Tao Ma492a8a32009-08-18 11:43:17 +08003056
3057 brelse(new_bh);
3058 brelse(old_bh);
3059 new_bh = NULL;
3060 old_bh = NULL;
3061 }
3062
3063 brelse(new_bh);
3064 brelse(old_bh);
3065 return ret;
3066}
3067
Tao Ma6f70fa52009-08-25 08:05:12 +08003068static int ocfs2_clear_ext_refcount(handle_t *handle,
3069 struct ocfs2_extent_tree *et,
3070 u32 cpos, u32 p_cluster, u32 len,
3071 unsigned int ext_flags,
3072 struct ocfs2_alloc_context *meta_ac,
3073 struct ocfs2_cached_dealloc_ctxt *dealloc)
3074{
3075 int ret, index;
3076 struct ocfs2_extent_rec replace_rec;
3077 struct ocfs2_path *path = NULL;
3078 struct ocfs2_extent_list *el;
3079 struct super_block *sb = ocfs2_metadata_cache_get_super(et->et_ci);
3080 u64 ino = ocfs2_metadata_cache_owner(et->et_ci);
3081
Tao Ma198aac22011-02-22 08:20:04 +08003082 trace_ocfs2_clear_ext_refcount((unsigned long long)ino,
3083 cpos, len, p_cluster, ext_flags);
Tao Ma6f70fa52009-08-25 08:05:12 +08003084
3085 memset(&replace_rec, 0, sizeof(replace_rec));
3086 replace_rec.e_cpos = cpu_to_le32(cpos);
3087 replace_rec.e_leaf_clusters = cpu_to_le16(len);
3088 replace_rec.e_blkno = cpu_to_le64(ocfs2_clusters_to_blocks(sb,
3089 p_cluster));
3090 replace_rec.e_flags = ext_flags;
3091 replace_rec.e_flags &= ~OCFS2_EXT_REFCOUNTED;
3092
3093 path = ocfs2_new_path_from_et(et);
3094 if (!path) {
3095 ret = -ENOMEM;
3096 mlog_errno(ret);
3097 goto out;
3098 }
3099
3100 ret = ocfs2_find_path(et->et_ci, path, cpos);
3101 if (ret) {
3102 mlog_errno(ret);
3103 goto out;
3104 }
3105
3106 el = path_leaf_el(path);
3107
3108 index = ocfs2_search_extent_list(el, cpos);
3109 if (index == -1 || index >= le16_to_cpu(el->l_next_free_rec)) {
3110 ocfs2_error(sb,
3111 "Inode %llu has an extent at cpos %u which can no "
3112 "longer be found.\n",
3113 (unsigned long long)ino, cpos);
3114 ret = -EROFS;
3115 goto out;
3116 }
3117
3118 ret = ocfs2_split_extent(handle, et, path, index,
3119 &replace_rec, meta_ac, dealloc);
3120 if (ret)
3121 mlog_errno(ret);
3122
3123out:
3124 ocfs2_free_path(path);
3125 return ret;
3126}
3127
3128static int ocfs2_replace_clusters(handle_t *handle,
3129 struct ocfs2_cow_context *context,
3130 u32 cpos, u32 old,
3131 u32 new, u32 len,
3132 unsigned int ext_flags)
3133{
3134 int ret;
Tao Ma913580b2009-08-24 14:31:03 +08003135 struct ocfs2_caching_info *ci = context->data_et.et_ci;
Tao Ma6f70fa52009-08-25 08:05:12 +08003136 u64 ino = ocfs2_metadata_cache_owner(ci);
3137
Tao Ma198aac22011-02-22 08:20:04 +08003138 trace_ocfs2_replace_clusters((unsigned long long)ino,
3139 cpos, old, new, len, ext_flags);
Tao Ma6f70fa52009-08-25 08:05:12 +08003140
3141 /*If the old clusters is unwritten, no need to duplicate. */
3142 if (!(ext_flags & OCFS2_EXT_UNWRITTEN)) {
Tiger Yangc7dd3392013-08-13 16:00:58 -07003143 ret = context->cow_duplicate_clusters(handle, context->inode,
Tristan Ye3e19a252011-05-24 16:21:20 +08003144 cpos, old, new, len);
Tao Ma6f70fa52009-08-25 08:05:12 +08003145 if (ret) {
3146 mlog_errno(ret);
3147 goto out;
3148 }
3149 }
3150
Tao Ma913580b2009-08-24 14:31:03 +08003151 ret = ocfs2_clear_ext_refcount(handle, &context->data_et,
Tao Ma6f70fa52009-08-25 08:05:12 +08003152 cpos, new, len, ext_flags,
3153 context->meta_ac, &context->dealloc);
3154 if (ret)
3155 mlog_errno(ret);
3156out:
3157 return ret;
3158}
3159
Tristan Ye3e19a252011-05-24 16:21:20 +08003160int ocfs2_cow_sync_writeback(struct super_block *sb,
3161 struct inode *inode,
3162 u32 cpos, u32 num_clusters)
Tao Ma6f70fa52009-08-25 08:05:12 +08003163{
3164 int ret = 0;
3165 loff_t offset, end, map_end;
3166 pgoff_t page_index;
3167 struct page *page;
3168
Tristan Ye3e19a252011-05-24 16:21:20 +08003169 if (ocfs2_should_order_data(inode))
Tao Ma6f70fa52009-08-25 08:05:12 +08003170 return 0;
3171
3172 offset = ((loff_t)cpos) << OCFS2_SB(sb)->s_clustersize_bits;
3173 end = offset + (num_clusters << OCFS2_SB(sb)->s_clustersize_bits);
3174
Tristan Ye3e19a252011-05-24 16:21:20 +08003175 ret = filemap_fdatawrite_range(inode->i_mapping,
Tao Ma6f70fa52009-08-25 08:05:12 +08003176 offset, end - 1);
3177 if (ret < 0) {
3178 mlog_errno(ret);
3179 return ret;
3180 }
3181
3182 while (offset < end) {
3183 page_index = offset >> PAGE_CACHE_SHIFT;
Tao Mad622b892010-01-30 23:32:19 +08003184 map_end = ((loff_t)page_index + 1) << PAGE_CACHE_SHIFT;
Tao Ma6f70fa52009-08-25 08:05:12 +08003185 if (map_end > end)
3186 map_end = end;
3187
Tristan Ye3e19a252011-05-24 16:21:20 +08003188 page = find_or_create_page(inode->i_mapping,
Jan Kara9b4c0ff2010-08-24 14:28:03 +02003189 page_index, GFP_NOFS);
Tao Ma6f70fa52009-08-25 08:05:12 +08003190 BUG_ON(!page);
3191
3192 wait_on_page_writeback(page);
3193 if (PageError(page)) {
3194 ret = -EIO;
3195 mlog_errno(ret);
3196 } else
3197 mark_page_accessed(page);
3198
3199 unlock_page(page);
3200 page_cache_release(page);
3201 page = NULL;
3202 offset = map_end;
3203 if (ret)
3204 break;
3205 }
3206
3207 return ret;
3208}
3209
Tao Ma913580b2009-08-24 14:31:03 +08003210static int ocfs2_di_get_clusters(struct ocfs2_cow_context *context,
3211 u32 v_cluster, u32 *p_cluster,
3212 u32 *num_clusters,
3213 unsigned int *extent_flags)
3214{
3215 return ocfs2_get_clusters(context->inode, v_cluster, p_cluster,
3216 num_clusters, extent_flags);
3217}
3218
Tao Ma6f70fa52009-08-25 08:05:12 +08003219static int ocfs2_make_clusters_writable(struct super_block *sb,
3220 struct ocfs2_cow_context *context,
3221 u32 cpos, u32 p_cluster,
3222 u32 num_clusters, unsigned int e_flags)
3223{
Tao Ma6ae23c52009-08-18 11:30:55 +08003224 int ret, delete, index, credits = 0;
Tristan Yeacf3bb02011-01-21 18:20:18 +08003225 u32 new_bit, new_len, orig_num_clusters;
Tao Ma6ae23c52009-08-18 11:30:55 +08003226 unsigned int set_len;
Tao Ma6f70fa52009-08-25 08:05:12 +08003227 struct ocfs2_super *osb = OCFS2_SB(sb);
3228 handle_t *handle;
Tao Ma6ae23c52009-08-18 11:30:55 +08003229 struct buffer_head *ref_leaf_bh = NULL;
Tao Ma913580b2009-08-24 14:31:03 +08003230 struct ocfs2_caching_info *ref_ci = &context->ref_tree->rf_ci;
Tao Ma6ae23c52009-08-18 11:30:55 +08003231 struct ocfs2_refcount_rec rec;
3232
Tao Ma198aac22011-02-22 08:20:04 +08003233 trace_ocfs2_make_clusters_writable(cpos, p_cluster,
3234 num_clusters, e_flags);
Tao Ma6f70fa52009-08-25 08:05:12 +08003235
3236 ret = ocfs2_lock_refcount_allocators(sb, p_cluster, num_clusters,
Tao Ma913580b2009-08-24 14:31:03 +08003237 &context->data_et,
3238 ref_ci,
Tao Ma6f70fa52009-08-25 08:05:12 +08003239 context->ref_root_bh,
3240 &context->meta_ac,
3241 &context->data_ac, &credits);
3242 if (ret) {
3243 mlog_errno(ret);
3244 return ret;
3245 }
3246
Tao Ma492a8a32009-08-18 11:43:17 +08003247 if (context->post_refcount)
3248 credits += context->post_refcount->credits;
3249
3250 credits += context->extra_credits;
Tao Ma6f70fa52009-08-25 08:05:12 +08003251 handle = ocfs2_start_trans(osb, credits);
3252 if (IS_ERR(handle)) {
3253 ret = PTR_ERR(handle);
3254 mlog_errno(ret);
3255 goto out;
3256 }
3257
Tristan Yeacf3bb02011-01-21 18:20:18 +08003258 orig_num_clusters = num_clusters;
3259
Tao Ma6f70fa52009-08-25 08:05:12 +08003260 while (num_clusters) {
Tao Ma913580b2009-08-24 14:31:03 +08003261 ret = ocfs2_get_refcount_rec(ref_ci, context->ref_root_bh,
Tao Ma6ae23c52009-08-18 11:30:55 +08003262 p_cluster, num_clusters,
3263 &rec, &index, &ref_leaf_bh);
Tao Ma6f70fa52009-08-25 08:05:12 +08003264 if (ret) {
3265 mlog_errno(ret);
3266 goto out_commit;
3267 }
3268
Tao Ma6ae23c52009-08-18 11:30:55 +08003269 BUG_ON(!rec.r_refcount);
3270 set_len = min((u64)p_cluster + num_clusters,
3271 le64_to_cpu(rec.r_cpos) +
3272 le32_to_cpu(rec.r_clusters)) - p_cluster;
3273
3274 /*
3275 * There are many different situation here.
3276 * 1. If refcount == 1, remove the flag and don't COW.
3277 * 2. If refcount > 1, allocate clusters.
3278 * Here we may not allocate r_len once at a time, so continue
3279 * until we reach num_clusters.
3280 */
3281 if (le32_to_cpu(rec.r_refcount) == 1) {
3282 delete = 0;
Tao Ma913580b2009-08-24 14:31:03 +08003283 ret = ocfs2_clear_ext_refcount(handle,
3284 &context->data_et,
Tao Ma6ae23c52009-08-18 11:30:55 +08003285 cpos, p_cluster,
3286 set_len, e_flags,
3287 context->meta_ac,
3288 &context->dealloc);
3289 if (ret) {
3290 mlog_errno(ret);
3291 goto out_commit;
3292 }
3293 } else {
3294 delete = 1;
3295
Joel Becker1ed9b772010-05-06 13:59:06 +08003296 ret = __ocfs2_claim_clusters(handle,
Tao Ma6ae23c52009-08-18 11:30:55 +08003297 context->data_ac,
3298 1, set_len,
3299 &new_bit, &new_len);
3300 if (ret) {
3301 mlog_errno(ret);
3302 goto out_commit;
3303 }
3304
3305 ret = ocfs2_replace_clusters(handle, context,
3306 cpos, p_cluster, new_bit,
3307 new_len, e_flags);
3308 if (ret) {
3309 mlog_errno(ret);
3310 goto out_commit;
3311 }
3312 set_len = new_len;
3313 }
3314
Tao Ma913580b2009-08-24 14:31:03 +08003315 ret = __ocfs2_decrease_refcount(handle, ref_ci,
Tao Ma6ae23c52009-08-18 11:30:55 +08003316 context->ref_root_bh,
3317 p_cluster, set_len,
3318 context->meta_ac,
3319 &context->dealloc, delete);
Tao Ma6f70fa52009-08-25 08:05:12 +08003320 if (ret) {
3321 mlog_errno(ret);
3322 goto out_commit;
3323 }
3324
Tao Ma6ae23c52009-08-18 11:30:55 +08003325 cpos += set_len;
3326 p_cluster += set_len;
3327 num_clusters -= set_len;
3328 brelse(ref_leaf_bh);
3329 ref_leaf_bh = NULL;
Tao Ma6f70fa52009-08-25 08:05:12 +08003330 }
3331
Tao Ma492a8a32009-08-18 11:43:17 +08003332 /* handle any post_cow action. */
3333 if (context->post_refcount && context->post_refcount->func) {
3334 ret = context->post_refcount->func(context->inode, handle,
3335 context->post_refcount->para);
3336 if (ret) {
3337 mlog_errno(ret);
3338 goto out_commit;
3339 }
3340 }
3341
Tao Ma6f70fa52009-08-25 08:05:12 +08003342 /*
3343 * Here we should write the new page out first if we are
3344 * in write-back mode.
3345 */
Tao Ma492a8a32009-08-18 11:43:17 +08003346 if (context->get_clusters == ocfs2_di_get_clusters) {
Tristan Ye3e19a252011-05-24 16:21:20 +08003347 ret = ocfs2_cow_sync_writeback(sb, context->inode, cpos,
Tristan Yeacf3bb02011-01-21 18:20:18 +08003348 orig_num_clusters);
Tao Ma492a8a32009-08-18 11:43:17 +08003349 if (ret)
3350 mlog_errno(ret);
3351 }
Tao Ma6f70fa52009-08-25 08:05:12 +08003352
3353out_commit:
3354 ocfs2_commit_trans(osb, handle);
3355
3356out:
3357 if (context->data_ac) {
3358 ocfs2_free_alloc_context(context->data_ac);
3359 context->data_ac = NULL;
3360 }
3361 if (context->meta_ac) {
3362 ocfs2_free_alloc_context(context->meta_ac);
3363 context->meta_ac = NULL;
3364 }
Tao Ma6ae23c52009-08-18 11:30:55 +08003365 brelse(ref_leaf_bh);
Tao Ma6f70fa52009-08-25 08:05:12 +08003366
3367 return ret;
3368}
3369
Tao Ma913580b2009-08-24 14:31:03 +08003370static int ocfs2_replace_cow(struct ocfs2_cow_context *context)
Tao Ma6f70fa52009-08-25 08:05:12 +08003371{
3372 int ret = 0;
Tao Ma913580b2009-08-24 14:31:03 +08003373 struct inode *inode = context->inode;
3374 u32 cow_start = context->cow_start, cow_len = context->cow_len;
3375 u32 p_cluster, num_clusters;
Tao Ma6f70fa52009-08-25 08:05:12 +08003376 unsigned int ext_flags;
3377 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
Tao Ma6f70fa52009-08-25 08:05:12 +08003378
3379 if (!ocfs2_refcount_tree(OCFS2_SB(inode->i_sb))) {
3380 ocfs2_error(inode->i_sb, "Inode %lu want to use refcount "
3381 "tree, but the feature bit is not set in the "
3382 "super block.", inode->i_ino);
3383 return -EROFS;
3384 }
3385
Tao Ma6f70fa52009-08-25 08:05:12 +08003386 ocfs2_init_dealloc_ctxt(&context->dealloc);
Tao Ma6f70fa52009-08-25 08:05:12 +08003387
3388 while (cow_len) {
Tao Ma913580b2009-08-24 14:31:03 +08003389 ret = context->get_clusters(context, cow_start, &p_cluster,
3390 &num_clusters, &ext_flags);
Tao Ma6f70fa52009-08-25 08:05:12 +08003391 if (ret) {
3392 mlog_errno(ret);
3393 break;
3394 }
3395
3396 BUG_ON(!(ext_flags & OCFS2_EXT_REFCOUNTED));
3397
3398 if (cow_len < num_clusters)
3399 num_clusters = cow_len;
3400
3401 ret = ocfs2_make_clusters_writable(inode->i_sb, context,
3402 cow_start, p_cluster,
3403 num_clusters, ext_flags);
3404 if (ret) {
3405 mlog_errno(ret);
3406 break;
3407 }
3408
3409 cow_len -= num_clusters;
3410 cow_start += num_clusters;
3411 }
3412
Tao Ma6f70fa52009-08-25 08:05:12 +08003413 if (ocfs2_dealloc_has_cluster(&context->dealloc)) {
3414 ocfs2_schedule_truncate_log_flush(osb, 1);
3415 ocfs2_run_deallocs(osb, &context->dealloc);
3416 }
3417
Tao Ma6f70fa52009-08-25 08:05:12 +08003418 return ret;
3419}
3420
3421/*
Tao Ma37f8a2b2009-08-26 09:47:28 +08003422 * Starting at cpos, try to CoW write_len clusters. Don't CoW
3423 * past max_cpos. This will stop when it runs into a hole or an
3424 * unrefcounted extent.
Tao Ma6f70fa52009-08-25 08:05:12 +08003425 */
3426static int ocfs2_refcount_cow_hunk(struct inode *inode,
3427 struct buffer_head *di_bh,
Tao Ma37f8a2b2009-08-26 09:47:28 +08003428 u32 cpos, u32 write_len, u32 max_cpos)
Tao Ma6f70fa52009-08-25 08:05:12 +08003429{
3430 int ret;
3431 u32 cow_start = 0, cow_len = 0;
3432 struct ocfs2_inode_info *oi = OCFS2_I(inode);
3433 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3434 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
3435 struct buffer_head *ref_root_bh = NULL;
3436 struct ocfs2_refcount_tree *ref_tree;
Tao Ma913580b2009-08-24 14:31:03 +08003437 struct ocfs2_cow_context *context = NULL;
Tao Ma6f70fa52009-08-25 08:05:12 +08003438
3439 BUG_ON(!(oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL));
3440
Tao Ma913580b2009-08-24 14:31:03 +08003441 ret = ocfs2_refcount_cal_cow_clusters(inode, &di->id2.i_list,
Tao Ma37f8a2b2009-08-26 09:47:28 +08003442 cpos, write_len, max_cpos,
Tao Ma6f70fa52009-08-25 08:05:12 +08003443 &cow_start, &cow_len);
3444 if (ret) {
3445 mlog_errno(ret);
3446 goto out;
3447 }
Tao Ma37f8a2b2009-08-26 09:47:28 +08003448
Tao Ma198aac22011-02-22 08:20:04 +08003449 trace_ocfs2_refcount_cow_hunk(OCFS2_I(inode)->ip_blkno,
3450 cpos, write_len, max_cpos,
3451 cow_start, cow_len);
Tao Ma6f70fa52009-08-25 08:05:12 +08003452
3453 BUG_ON(cow_len == 0);
3454
Tao Ma913580b2009-08-24 14:31:03 +08003455 context = kzalloc(sizeof(struct ocfs2_cow_context), GFP_NOFS);
3456 if (!context) {
3457 ret = -ENOMEM;
3458 mlog_errno(ret);
3459 goto out;
3460 }
3461
Tao Ma6f70fa52009-08-25 08:05:12 +08003462 ret = ocfs2_lock_refcount_tree(osb, le64_to_cpu(di->i_refcount_loc),
3463 1, &ref_tree, &ref_root_bh);
3464 if (ret) {
3465 mlog_errno(ret);
3466 goto out;
3467 }
3468
Tao Ma913580b2009-08-24 14:31:03 +08003469 context->inode = inode;
3470 context->cow_start = cow_start;
3471 context->cow_len = cow_len;
3472 context->ref_tree = ref_tree;
3473 context->ref_root_bh = ref_root_bh;
3474 context->cow_duplicate_clusters = ocfs2_duplicate_clusters_by_page;
3475 context->get_clusters = ocfs2_di_get_clusters;
3476
3477 ocfs2_init_dinode_extent_tree(&context->data_et,
3478 INODE_CACHE(inode), di_bh);
3479
3480 ret = ocfs2_replace_cow(context);
Tao Ma6f70fa52009-08-25 08:05:12 +08003481 if (ret)
3482 mlog_errno(ret);
3483
Tao Ma913580b2009-08-24 14:31:03 +08003484 /*
3485 * truncate the extent map here since no matter whether we meet with
3486 * any error during the action, we shouldn't trust cached extent map
3487 * any more.
3488 */
3489 ocfs2_extent_map_trunc(inode, cow_start);
3490
Tao Ma6f70fa52009-08-25 08:05:12 +08003491 ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
3492 brelse(ref_root_bh);
3493out:
Tao Ma913580b2009-08-24 14:31:03 +08003494 kfree(context);
Tao Ma6f70fa52009-08-25 08:05:12 +08003495 return ret;
3496}
3497
3498/*
3499 * CoW any and all clusters between cpos and cpos+write_len.
Tao Ma37f8a2b2009-08-26 09:47:28 +08003500 * Don't CoW past max_cpos. If this returns successfully, all
3501 * clusters between cpos and cpos+write_len are safe to modify.
Tao Ma6f70fa52009-08-25 08:05:12 +08003502 */
3503int ocfs2_refcount_cow(struct inode *inode,
3504 struct buffer_head *di_bh,
Tao Ma37f8a2b2009-08-26 09:47:28 +08003505 u32 cpos, u32 write_len, u32 max_cpos)
Tao Ma6f70fa52009-08-25 08:05:12 +08003506{
3507 int ret = 0;
3508 u32 p_cluster, num_clusters;
3509 unsigned int ext_flags;
3510
3511 while (write_len) {
3512 ret = ocfs2_get_clusters(inode, cpos, &p_cluster,
3513 &num_clusters, &ext_flags);
3514 if (ret) {
3515 mlog_errno(ret);
3516 break;
3517 }
3518
3519 if (write_len < num_clusters)
3520 num_clusters = write_len;
3521
3522 if (ext_flags & OCFS2_EXT_REFCOUNTED) {
Tiger Yangc7dd3392013-08-13 16:00:58 -07003523 ret = ocfs2_refcount_cow_hunk(inode, di_bh, cpos,
Tao Ma37f8a2b2009-08-26 09:47:28 +08003524 num_clusters, max_cpos);
Tao Ma6f70fa52009-08-25 08:05:12 +08003525 if (ret) {
3526 mlog_errno(ret);
3527 break;
3528 }
3529 }
3530
3531 write_len -= num_clusters;
3532 cpos += num_clusters;
3533 }
3534
3535 return ret;
3536}
Tao Ma110a0452009-08-22 23:54:27 +08003537
Tao Ma492a8a32009-08-18 11:43:17 +08003538static int ocfs2_xattr_value_get_clusters(struct ocfs2_cow_context *context,
3539 u32 v_cluster, u32 *p_cluster,
3540 u32 *num_clusters,
3541 unsigned int *extent_flags)
3542{
3543 struct inode *inode = context->inode;
3544 struct ocfs2_xattr_value_root *xv = context->cow_object;
3545
3546 return ocfs2_xattr_get_clusters(inode, v_cluster, p_cluster,
3547 num_clusters, &xv->xr_list,
3548 extent_flags);
3549}
3550
3551/*
3552 * Given a xattr value root, calculate the most meta/credits we need for
3553 * refcount tree change if we truncate it to 0.
3554 */
3555int ocfs2_refcounted_xattr_delete_need(struct inode *inode,
3556 struct ocfs2_caching_info *ref_ci,
3557 struct buffer_head *ref_root_bh,
3558 struct ocfs2_xattr_value_root *xv,
3559 int *meta_add, int *credits)
3560{
3561 int ret = 0, index, ref_blocks = 0;
3562 u32 p_cluster, num_clusters;
3563 u32 cpos = 0, clusters = le32_to_cpu(xv->xr_clusters);
3564 struct ocfs2_refcount_block *rb;
3565 struct ocfs2_refcount_rec rec;
3566 struct buffer_head *ref_leaf_bh = NULL;
3567
3568 while (cpos < clusters) {
3569 ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster,
3570 &num_clusters, &xv->xr_list,
3571 NULL);
3572 if (ret) {
3573 mlog_errno(ret);
3574 goto out;
3575 }
3576
3577 cpos += num_clusters;
3578
3579 while (num_clusters) {
3580 ret = ocfs2_get_refcount_rec(ref_ci, ref_root_bh,
3581 p_cluster, num_clusters,
3582 &rec, &index,
3583 &ref_leaf_bh);
3584 if (ret) {
3585 mlog_errno(ret);
3586 goto out;
3587 }
3588
3589 BUG_ON(!rec.r_refcount);
3590
3591 rb = (struct ocfs2_refcount_block *)ref_leaf_bh->b_data;
3592
3593 /*
3594 * We really don't know whether the other clusters is in
3595 * this refcount block or not, so just take the worst
3596 * case that all the clusters are in this block and each
3597 * one will split a refcount rec, so totally we need
3598 * clusters * 2 new refcount rec.
3599 */
Al Viroe1bf4cc2012-04-13 12:27:11 -04003600 if (le16_to_cpu(rb->rf_records.rl_used) + clusters * 2 >
Tao Ma492a8a32009-08-18 11:43:17 +08003601 le16_to_cpu(rb->rf_records.rl_count))
3602 ref_blocks++;
3603
3604 *credits += 1;
3605 brelse(ref_leaf_bh);
3606 ref_leaf_bh = NULL;
3607
3608 if (num_clusters <= le32_to_cpu(rec.r_clusters))
3609 break;
3610 else
3611 num_clusters -= le32_to_cpu(rec.r_clusters);
3612 p_cluster += num_clusters;
3613 }
3614 }
3615
3616 *meta_add += ref_blocks;
3617 if (!ref_blocks)
3618 goto out;
3619
3620 rb = (struct ocfs2_refcount_block *)ref_root_bh->b_data;
3621 if (le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL)
3622 *credits += OCFS2_EXPAND_REFCOUNT_TREE_CREDITS;
3623 else {
3624 struct ocfs2_extent_tree et;
3625
3626 ocfs2_init_refcount_extent_tree(&et, ref_ci, ref_root_bh);
3627 *credits += ocfs2_calc_extend_credits(inode->i_sb,
3628 et.et_root_el,
3629 ref_blocks);
3630 }
3631
3632out:
3633 brelse(ref_leaf_bh);
3634 return ret;
3635}
3636
3637/*
3638 * Do CoW for xattr.
3639 */
3640int ocfs2_refcount_cow_xattr(struct inode *inode,
3641 struct ocfs2_dinode *di,
3642 struct ocfs2_xattr_value_buf *vb,
3643 struct ocfs2_refcount_tree *ref_tree,
3644 struct buffer_head *ref_root_bh,
3645 u32 cpos, u32 write_len,
3646 struct ocfs2_post_refcount *post)
3647{
3648 int ret;
3649 struct ocfs2_xattr_value_root *xv = vb->vb_xv;
3650 struct ocfs2_inode_info *oi = OCFS2_I(inode);
3651 struct ocfs2_cow_context *context = NULL;
3652 u32 cow_start, cow_len;
3653
3654 BUG_ON(!(oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL));
3655
3656 ret = ocfs2_refcount_cal_cow_clusters(inode, &xv->xr_list,
3657 cpos, write_len, UINT_MAX,
3658 &cow_start, &cow_len);
3659 if (ret) {
3660 mlog_errno(ret);
3661 goto out;
3662 }
3663
3664 BUG_ON(cow_len == 0);
3665
3666 context = kzalloc(sizeof(struct ocfs2_cow_context), GFP_NOFS);
3667 if (!context) {
3668 ret = -ENOMEM;
3669 mlog_errno(ret);
3670 goto out;
3671 }
3672
3673 context->inode = inode;
3674 context->cow_start = cow_start;
3675 context->cow_len = cow_len;
3676 context->ref_tree = ref_tree;
Justin P. Mattock6eab04a2011-04-08 19:49:08 -07003677 context->ref_root_bh = ref_root_bh;
Tao Ma492a8a32009-08-18 11:43:17 +08003678 context->cow_object = xv;
3679
3680 context->cow_duplicate_clusters = ocfs2_duplicate_clusters_by_jbd;
3681 /* We need the extra credits for duplicate_clusters by jbd. */
3682 context->extra_credits =
3683 ocfs2_clusters_to_blocks(inode->i_sb, 1) * cow_len;
3684 context->get_clusters = ocfs2_xattr_value_get_clusters;
3685 context->post_refcount = post;
3686
3687 ocfs2_init_xattr_value_extent_tree(&context->data_et,
3688 INODE_CACHE(inode), vb);
3689
3690 ret = ocfs2_replace_cow(context);
3691 if (ret)
3692 mlog_errno(ret);
3693
3694out:
3695 kfree(context);
3696 return ret;
3697}
3698
Tao Ma110a0452009-08-22 23:54:27 +08003699/*
3700 * Insert a new extent into refcount tree and mark a extent rec
3701 * as refcounted in the dinode tree.
3702 */
3703int ocfs2_add_refcount_flag(struct inode *inode,
3704 struct ocfs2_extent_tree *data_et,
3705 struct ocfs2_caching_info *ref_ci,
3706 struct buffer_head *ref_root_bh,
3707 u32 cpos, u32 p_cluster, u32 num_clusters,
Tao Ma01292412009-09-21 13:04:19 +08003708 struct ocfs2_cached_dealloc_ctxt *dealloc,
3709 struct ocfs2_post_refcount *post)
Tao Ma110a0452009-08-22 23:54:27 +08003710{
3711 int ret;
3712 handle_t *handle;
3713 int credits = 1, ref_blocks = 0;
3714 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3715 struct ocfs2_alloc_context *meta_ac = NULL;
3716
3717 ret = ocfs2_calc_refcount_meta_credits(inode->i_sb,
3718 ref_ci, ref_root_bh,
3719 p_cluster, num_clusters,
3720 &ref_blocks, &credits);
3721 if (ret) {
3722 mlog_errno(ret);
3723 goto out;
3724 }
3725
Tao Ma198aac22011-02-22 08:20:04 +08003726 trace_ocfs2_add_refcount_flag(ref_blocks, credits);
Tao Ma110a0452009-08-22 23:54:27 +08003727
3728 if (ref_blocks) {
3729 ret = ocfs2_reserve_new_metadata_blocks(OCFS2_SB(inode->i_sb),
3730 ref_blocks, &meta_ac);
3731 if (ret) {
3732 mlog_errno(ret);
3733 goto out;
3734 }
3735 }
3736
Tao Ma01292412009-09-21 13:04:19 +08003737 if (post)
3738 credits += post->credits;
3739
Tao Ma110a0452009-08-22 23:54:27 +08003740 handle = ocfs2_start_trans(osb, credits);
3741 if (IS_ERR(handle)) {
3742 ret = PTR_ERR(handle);
3743 mlog_errno(ret);
3744 goto out;
3745 }
3746
3747 ret = ocfs2_mark_extent_refcounted(inode, data_et, handle,
3748 cpos, num_clusters, p_cluster,
3749 meta_ac, dealloc);
3750 if (ret) {
3751 mlog_errno(ret);
3752 goto out_commit;
3753 }
3754
Tao Ma7540c1a2009-08-18 11:44:03 +08003755 ret = __ocfs2_increase_refcount(handle, ref_ci, ref_root_bh,
3756 p_cluster, num_clusters, 0,
3757 meta_ac, dealloc);
Tao Ma01292412009-09-21 13:04:19 +08003758 if (ret) {
Tao Ma110a0452009-08-22 23:54:27 +08003759 mlog_errno(ret);
Tao Ma01292412009-09-21 13:04:19 +08003760 goto out_commit;
3761 }
3762
3763 if (post && post->func) {
3764 ret = post->func(inode, handle, post->para);
3765 if (ret)
3766 mlog_errno(ret);
3767 }
Tao Ma110a0452009-08-22 23:54:27 +08003768
3769out_commit:
3770 ocfs2_commit_trans(osb, handle);
3771out:
3772 if (meta_ac)
3773 ocfs2_free_alloc_context(meta_ac);
3774 return ret;
3775}
3776
Tao Maa9063ab2009-08-18 11:40:59 +08003777static int ocfs2_change_ctime(struct inode *inode,
3778 struct buffer_head *di_bh)
3779{
3780 int ret;
3781 handle_t *handle;
3782 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
3783
3784 handle = ocfs2_start_trans(OCFS2_SB(inode->i_sb),
3785 OCFS2_INODE_UPDATE_CREDITS);
3786 if (IS_ERR(handle)) {
3787 ret = PTR_ERR(handle);
3788 mlog_errno(ret);
3789 goto out;
3790 }
3791
3792 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
3793 OCFS2_JOURNAL_ACCESS_WRITE);
3794 if (ret) {
3795 mlog_errno(ret);
3796 goto out_commit;
3797 }
3798
3799 inode->i_ctime = CURRENT_TIME;
3800 di->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
3801 di->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
3802
3803 ocfs2_journal_dirty(handle, di_bh);
3804
3805out_commit:
3806 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
3807out:
3808 return ret;
3809}
3810
Tao Ma110a0452009-08-22 23:54:27 +08003811static int ocfs2_attach_refcount_tree(struct inode *inode,
3812 struct buffer_head *di_bh)
3813{
Tao Maa9063ab2009-08-18 11:40:59 +08003814 int ret, data_changed = 0;
Tao Ma110a0452009-08-22 23:54:27 +08003815 struct buffer_head *ref_root_bh = NULL;
3816 struct ocfs2_inode_info *oi = OCFS2_I(inode);
3817 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
3818 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3819 struct ocfs2_refcount_tree *ref_tree;
3820 unsigned int ext_flags;
3821 loff_t size;
3822 u32 cpos, num_clusters, clusters, p_cluster;
3823 struct ocfs2_cached_dealloc_ctxt dealloc;
3824 struct ocfs2_extent_tree di_et;
3825
3826 ocfs2_init_dealloc_ctxt(&dealloc);
3827
3828 if (!(oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL)) {
3829 ret = ocfs2_create_refcount_tree(inode, di_bh);
3830 if (ret) {
3831 mlog_errno(ret);
3832 goto out;
3833 }
3834 }
3835
3836 BUG_ON(!di->i_refcount_loc);
3837 ret = ocfs2_lock_refcount_tree(osb,
3838 le64_to_cpu(di->i_refcount_loc), 1,
3839 &ref_tree, &ref_root_bh);
3840 if (ret) {
3841 mlog_errno(ret);
3842 goto out;
3843 }
3844
Tao Ma2f48d5932009-10-15 11:10:49 +08003845 if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL)
3846 goto attach_xattr;
3847
Tao Ma110a0452009-08-22 23:54:27 +08003848 ocfs2_init_dinode_extent_tree(&di_et, INODE_CACHE(inode), di_bh);
3849
3850 size = i_size_read(inode);
3851 clusters = ocfs2_clusters_for_bytes(inode->i_sb, size);
3852
3853 cpos = 0;
3854 while (cpos < clusters) {
3855 ret = ocfs2_get_clusters(inode, cpos, &p_cluster,
3856 &num_clusters, &ext_flags);
Joseph Qi2b0f6ea2013-09-11 14:19:52 -07003857 if (ret) {
3858 mlog_errno(ret);
3859 goto unlock;
3860 }
Tao Ma110a0452009-08-22 23:54:27 +08003861 if (p_cluster && !(ext_flags & OCFS2_EXT_REFCOUNTED)) {
3862 ret = ocfs2_add_refcount_flag(inode, &di_et,
3863 &ref_tree->rf_ci,
3864 ref_root_bh, cpos,
3865 p_cluster, num_clusters,
Tao Ma01292412009-09-21 13:04:19 +08003866 &dealloc, NULL);
Tao Ma110a0452009-08-22 23:54:27 +08003867 if (ret) {
3868 mlog_errno(ret);
Tao Maa9063ab2009-08-18 11:40:59 +08003869 goto unlock;
Tao Ma110a0452009-08-22 23:54:27 +08003870 }
Tao Maa9063ab2009-08-18 11:40:59 +08003871
3872 data_changed = 1;
Tao Ma110a0452009-08-22 23:54:27 +08003873 }
3874 cpos += num_clusters;
3875 }
3876
Tao Ma2f48d5932009-10-15 11:10:49 +08003877attach_xattr:
Tao Ma01292412009-09-21 13:04:19 +08003878 if (oi->ip_dyn_features & OCFS2_HAS_XATTR_FL) {
3879 ret = ocfs2_xattr_attach_refcount_tree(inode, di_bh,
3880 &ref_tree->rf_ci,
3881 ref_root_bh,
3882 &dealloc);
3883 if (ret) {
3884 mlog_errno(ret);
3885 goto unlock;
3886 }
3887 }
3888
Tao Maa9063ab2009-08-18 11:40:59 +08003889 if (data_changed) {
3890 ret = ocfs2_change_ctime(inode, di_bh);
3891 if (ret)
3892 mlog_errno(ret);
3893 }
3894
3895unlock:
Tao Ma110a0452009-08-22 23:54:27 +08003896 ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
3897 brelse(ref_root_bh);
3898
3899 if (!ret && ocfs2_dealloc_has_cluster(&dealloc)) {
3900 ocfs2_schedule_truncate_log_flush(osb, 1);
3901 ocfs2_run_deallocs(osb, &dealloc);
3902 }
3903out:
3904 /*
3905 * Empty the extent map so that we may get the right extent
3906 * record from the disk.
3907 */
3908 ocfs2_extent_map_trunc(inode, 0);
3909
3910 return ret;
3911}
3912
3913static int ocfs2_add_refcounted_extent(struct inode *inode,
3914 struct ocfs2_extent_tree *et,
3915 struct ocfs2_caching_info *ref_ci,
3916 struct buffer_head *ref_root_bh,
3917 u32 cpos, u32 p_cluster, u32 num_clusters,
3918 unsigned int ext_flags,
3919 struct ocfs2_cached_dealloc_ctxt *dealloc)
3920{
3921 int ret;
3922 handle_t *handle;
3923 int credits = 0;
3924 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3925 struct ocfs2_alloc_context *meta_ac = NULL;
3926
3927 ret = ocfs2_lock_refcount_allocators(inode->i_sb,
3928 p_cluster, num_clusters,
3929 et, ref_ci,
3930 ref_root_bh, &meta_ac,
3931 NULL, &credits);
3932 if (ret) {
3933 mlog_errno(ret);
3934 goto out;
3935 }
3936
3937 handle = ocfs2_start_trans(osb, credits);
3938 if (IS_ERR(handle)) {
3939 ret = PTR_ERR(handle);
3940 mlog_errno(ret);
3941 goto out;
3942 }
3943
3944 ret = ocfs2_insert_extent(handle, et, cpos,
Tao Ma12d4cec2009-11-30 15:08:40 +08003945 ocfs2_clusters_to_blocks(inode->i_sb, p_cluster),
Tao Ma110a0452009-08-22 23:54:27 +08003946 num_clusters, ext_flags, meta_ac);
3947 if (ret) {
3948 mlog_errno(ret);
3949 goto out_commit;
3950 }
3951
Tao Ma2999d122009-08-18 11:43:55 +08003952 ret = ocfs2_increase_refcount(handle, ref_ci, ref_root_bh,
3953 p_cluster, num_clusters,
3954 meta_ac, dealloc);
Tao Ma110a0452009-08-22 23:54:27 +08003955 if (ret)
3956 mlog_errno(ret);
3957
3958out_commit:
3959 ocfs2_commit_trans(osb, handle);
3960out:
3961 if (meta_ac)
3962 ocfs2_free_alloc_context(meta_ac);
3963 return ret;
3964}
3965
Tao Ma2f48d5932009-10-15 11:10:49 +08003966static int ocfs2_duplicate_inline_data(struct inode *s_inode,
3967 struct buffer_head *s_bh,
3968 struct inode *t_inode,
3969 struct buffer_head *t_bh)
3970{
3971 int ret;
3972 handle_t *handle;
3973 struct ocfs2_super *osb = OCFS2_SB(s_inode->i_sb);
3974 struct ocfs2_dinode *s_di = (struct ocfs2_dinode *)s_bh->b_data;
3975 struct ocfs2_dinode *t_di = (struct ocfs2_dinode *)t_bh->b_data;
3976
3977 BUG_ON(!(OCFS2_I(s_inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL));
3978
3979 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
3980 if (IS_ERR(handle)) {
3981 ret = PTR_ERR(handle);
3982 mlog_errno(ret);
3983 goto out;
3984 }
3985
3986 ret = ocfs2_journal_access_di(handle, INODE_CACHE(t_inode), t_bh,
3987 OCFS2_JOURNAL_ACCESS_WRITE);
3988 if (ret) {
3989 mlog_errno(ret);
3990 goto out_commit;
3991 }
3992
3993 t_di->id2.i_data.id_count = s_di->id2.i_data.id_count;
3994 memcpy(t_di->id2.i_data.id_data, s_di->id2.i_data.id_data,
3995 le16_to_cpu(s_di->id2.i_data.id_count));
3996 spin_lock(&OCFS2_I(t_inode)->ip_lock);
3997 OCFS2_I(t_inode)->ip_dyn_features |= OCFS2_INLINE_DATA_FL;
3998 t_di->i_dyn_features = cpu_to_le16(OCFS2_I(t_inode)->ip_dyn_features);
3999 spin_unlock(&OCFS2_I(t_inode)->ip_lock);
4000
4001 ocfs2_journal_dirty(handle, t_bh);
4002
4003out_commit:
4004 ocfs2_commit_trans(osb, handle);
4005out:
4006 return ret;
4007}
4008
Tao Ma110a0452009-08-22 23:54:27 +08004009static int ocfs2_duplicate_extent_list(struct inode *s_inode,
4010 struct inode *t_inode,
4011 struct buffer_head *t_bh,
4012 struct ocfs2_caching_info *ref_ci,
4013 struct buffer_head *ref_root_bh,
4014 struct ocfs2_cached_dealloc_ctxt *dealloc)
4015{
4016 int ret = 0;
4017 u32 p_cluster, num_clusters, clusters, cpos;
4018 loff_t size;
4019 unsigned int ext_flags;
4020 struct ocfs2_extent_tree et;
4021
4022 ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(t_inode), t_bh);
4023
4024 size = i_size_read(s_inode);
4025 clusters = ocfs2_clusters_for_bytes(s_inode->i_sb, size);
4026
4027 cpos = 0;
4028 while (cpos < clusters) {
4029 ret = ocfs2_get_clusters(s_inode, cpos, &p_cluster,
4030 &num_clusters, &ext_flags);
Joseph Qi2b0f6ea2013-09-11 14:19:52 -07004031 if (ret) {
4032 mlog_errno(ret);
4033 goto out;
4034 }
Tao Ma110a0452009-08-22 23:54:27 +08004035 if (p_cluster) {
4036 ret = ocfs2_add_refcounted_extent(t_inode, &et,
4037 ref_ci, ref_root_bh,
4038 cpos, p_cluster,
4039 num_clusters,
4040 ext_flags,
4041 dealloc);
4042 if (ret) {
4043 mlog_errno(ret);
4044 goto out;
4045 }
4046 }
4047
4048 cpos += num_clusters;
4049 }
4050
4051out:
4052 return ret;
4053}
4054
Tao Maa9063ab2009-08-18 11:40:59 +08004055/*
4056 * change the new file's attributes to the src.
4057 *
4058 * reflink creates a snapshot of a file, that means the attributes
4059 * must be identical except for three exceptions - nlink, ino, and ctime.
4060 */
4061static int ocfs2_complete_reflink(struct inode *s_inode,
4062 struct buffer_head *s_bh,
4063 struct inode *t_inode,
Tao Ma0fe9b662009-08-18 11:47:56 +08004064 struct buffer_head *t_bh,
4065 bool preserve)
Tao Maa9063ab2009-08-18 11:40:59 +08004066{
4067 int ret;
4068 handle_t *handle;
4069 struct ocfs2_dinode *s_di = (struct ocfs2_dinode *)s_bh->b_data;
4070 struct ocfs2_dinode *di = (struct ocfs2_dinode *)t_bh->b_data;
4071 loff_t size = i_size_read(s_inode);
4072
4073 handle = ocfs2_start_trans(OCFS2_SB(t_inode->i_sb),
4074 OCFS2_INODE_UPDATE_CREDITS);
4075 if (IS_ERR(handle)) {
4076 ret = PTR_ERR(handle);
4077 mlog_errno(ret);
4078 return ret;
4079 }
4080
4081 ret = ocfs2_journal_access_di(handle, INODE_CACHE(t_inode), t_bh,
4082 OCFS2_JOURNAL_ACCESS_WRITE);
4083 if (ret) {
4084 mlog_errno(ret);
4085 goto out_commit;
4086 }
4087
4088 spin_lock(&OCFS2_I(t_inode)->ip_lock);
4089 OCFS2_I(t_inode)->ip_clusters = OCFS2_I(s_inode)->ip_clusters;
4090 OCFS2_I(t_inode)->ip_attr = OCFS2_I(s_inode)->ip_attr;
4091 OCFS2_I(t_inode)->ip_dyn_features = OCFS2_I(s_inode)->ip_dyn_features;
4092 spin_unlock(&OCFS2_I(t_inode)->ip_lock);
4093 i_size_write(t_inode, size);
Tao Ma6527f8f2010-03-10 09:56:52 +08004094 t_inode->i_blocks = s_inode->i_blocks;
Tao Maa9063ab2009-08-18 11:40:59 +08004095
4096 di->i_xattr_inline_size = s_di->i_xattr_inline_size;
4097 di->i_clusters = s_di->i_clusters;
4098 di->i_size = s_di->i_size;
4099 di->i_dyn_features = s_di->i_dyn_features;
4100 di->i_attr = s_di->i_attr;
Tao Maa9063ab2009-08-18 11:40:59 +08004101
Tao Ma0fe9b662009-08-18 11:47:56 +08004102 if (preserve) {
Tao Mac21a5342010-04-21 14:05:55 +08004103 t_inode->i_uid = s_inode->i_uid;
4104 t_inode->i_gid = s_inode->i_gid;
4105 t_inode->i_mode = s_inode->i_mode;
Tao Ma0fe9b662009-08-18 11:47:56 +08004106 di->i_uid = s_di->i_uid;
4107 di->i_gid = s_di->i_gid;
4108 di->i_mode = s_di->i_mode;
Tao Maa9063ab2009-08-18 11:40:59 +08004109
Tao Ma0fe9b662009-08-18 11:47:56 +08004110 /*
4111 * update time.
4112 * we want mtime to appear identical to the source and
4113 * update ctime.
4114 */
4115 t_inode->i_ctime = CURRENT_TIME;
Tao Maa9063ab2009-08-18 11:40:59 +08004116
Tao Ma0fe9b662009-08-18 11:47:56 +08004117 di->i_ctime = cpu_to_le64(t_inode->i_ctime.tv_sec);
4118 di->i_ctime_nsec = cpu_to_le32(t_inode->i_ctime.tv_nsec);
4119
4120 t_inode->i_mtime = s_inode->i_mtime;
4121 di->i_mtime = s_di->i_mtime;
4122 di->i_mtime_nsec = s_di->i_mtime_nsec;
4123 }
Tao Maa9063ab2009-08-18 11:40:59 +08004124
4125 ocfs2_journal_dirty(handle, t_bh);
4126
4127out_commit:
4128 ocfs2_commit_trans(OCFS2_SB(t_inode->i_sb), handle);
4129 return ret;
4130}
4131
Tao Ma110a0452009-08-22 23:54:27 +08004132static int ocfs2_create_reflink_node(struct inode *s_inode,
4133 struct buffer_head *s_bh,
4134 struct inode *t_inode,
Tao Ma0fe9b662009-08-18 11:47:56 +08004135 struct buffer_head *t_bh,
4136 bool preserve)
Tao Ma110a0452009-08-22 23:54:27 +08004137{
4138 int ret;
4139 struct buffer_head *ref_root_bh = NULL;
4140 struct ocfs2_cached_dealloc_ctxt dealloc;
4141 struct ocfs2_super *osb = OCFS2_SB(s_inode->i_sb);
4142 struct ocfs2_refcount_block *rb;
4143 struct ocfs2_dinode *di = (struct ocfs2_dinode *)s_bh->b_data;
4144 struct ocfs2_refcount_tree *ref_tree;
4145
4146 ocfs2_init_dealloc_ctxt(&dealloc);
4147
4148 ret = ocfs2_set_refcount_tree(t_inode, t_bh,
4149 le64_to_cpu(di->i_refcount_loc));
4150 if (ret) {
4151 mlog_errno(ret);
4152 goto out;
4153 }
4154
Tao Ma2f48d5932009-10-15 11:10:49 +08004155 if (OCFS2_I(s_inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
4156 ret = ocfs2_duplicate_inline_data(s_inode, s_bh,
4157 t_inode, t_bh);
4158 if (ret)
4159 mlog_errno(ret);
4160 goto out;
4161 }
4162
Tao Ma110a0452009-08-22 23:54:27 +08004163 ret = ocfs2_lock_refcount_tree(osb, le64_to_cpu(di->i_refcount_loc),
4164 1, &ref_tree, &ref_root_bh);
4165 if (ret) {
4166 mlog_errno(ret);
4167 goto out;
4168 }
4169 rb = (struct ocfs2_refcount_block *)ref_root_bh->b_data;
4170
4171 ret = ocfs2_duplicate_extent_list(s_inode, t_inode, t_bh,
4172 &ref_tree->rf_ci, ref_root_bh,
4173 &dealloc);
Tao Maa9063ab2009-08-18 11:40:59 +08004174 if (ret) {
4175 mlog_errno(ret);
4176 goto out_unlock_refcount;
4177 }
4178
Tao Maa9063ab2009-08-18 11:40:59 +08004179out_unlock_refcount:
Tao Ma110a0452009-08-22 23:54:27 +08004180 ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
4181 brelse(ref_root_bh);
4182out:
4183 if (ocfs2_dealloc_has_cluster(&dealloc)) {
4184 ocfs2_schedule_truncate_log_flush(osb, 1);
4185 ocfs2_run_deallocs(osb, &dealloc);
4186 }
4187
4188 return ret;
4189}
Tao Ma09bf27a2009-09-21 10:38:17 +08004190
4191static int __ocfs2_reflink(struct dentry *old_dentry,
4192 struct buffer_head *old_bh,
4193 struct inode *new_inode,
4194 bool preserve)
4195{
4196 int ret;
4197 struct inode *inode = old_dentry->d_inode;
4198 struct buffer_head *new_bh = NULL;
4199
Joel Becker56934862010-07-01 15:13:31 -07004200 if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_SYSTEM_FILE) {
4201 ret = -EINVAL;
4202 mlog_errno(ret);
4203 goto out;
4204 }
4205
Tao Ma09bf27a2009-09-21 10:38:17 +08004206 ret = filemap_fdatawrite(inode->i_mapping);
4207 if (ret) {
4208 mlog_errno(ret);
4209 goto out;
4210 }
4211
4212 ret = ocfs2_attach_refcount_tree(inode, old_bh);
4213 if (ret) {
4214 mlog_errno(ret);
4215 goto out;
4216 }
4217
Tao Ma07eaac92010-09-07 13:30:06 +08004218 mutex_lock_nested(&new_inode->i_mutex, I_MUTEX_CHILD);
4219 ret = ocfs2_inode_lock_nested(new_inode, &new_bh, 1,
4220 OI_LS_REFLINK_TARGET);
Tao Ma09bf27a2009-09-21 10:38:17 +08004221 if (ret) {
4222 mlog_errno(ret);
4223 goto out_unlock;
4224 }
4225
4226 ret = ocfs2_create_reflink_node(inode, old_bh,
4227 new_inode, new_bh, preserve);
4228 if (ret) {
4229 mlog_errno(ret);
4230 goto inode_unlock;
4231 }
4232
4233 if (OCFS2_I(inode)->ip_dyn_features & OCFS2_HAS_XATTR_FL) {
4234 ret = ocfs2_reflink_xattrs(inode, old_bh,
4235 new_inode, new_bh,
4236 preserve);
Tao Ma87f4b1b2009-10-15 11:10:48 +08004237 if (ret) {
Tao Ma09bf27a2009-09-21 10:38:17 +08004238 mlog_errno(ret);
Tao Ma87f4b1b2009-10-15 11:10:48 +08004239 goto inode_unlock;
4240 }
Tao Ma09bf27a2009-09-21 10:38:17 +08004241 }
Tao Ma87f4b1b2009-10-15 11:10:48 +08004242
4243 ret = ocfs2_complete_reflink(inode, old_bh,
4244 new_inode, new_bh, preserve);
4245 if (ret)
4246 mlog_errno(ret);
4247
Tao Ma09bf27a2009-09-21 10:38:17 +08004248inode_unlock:
4249 ocfs2_inode_unlock(new_inode, 1);
4250 brelse(new_bh);
4251out_unlock:
4252 mutex_unlock(&new_inode->i_mutex);
4253out:
4254 if (!ret) {
4255 ret = filemap_fdatawait(inode->i_mapping);
4256 if (ret)
4257 mlog_errno(ret);
4258 }
4259 return ret;
4260}
4261
4262static int ocfs2_reflink(struct dentry *old_dentry, struct inode *dir,
4263 struct dentry *new_dentry, bool preserve)
4264{
4265 int error;
4266 struct inode *inode = old_dentry->d_inode;
4267 struct buffer_head *old_bh = NULL;
4268 struct inode *new_orphan_inode = NULL;
4269
4270 if (!ocfs2_refcount_tree(OCFS2_SB(inode->i_sb)))
4271 return -EOPNOTSUPP;
4272
4273 error = ocfs2_create_inode_in_orphan(dir, inode->i_mode,
4274 &new_orphan_inode);
4275 if (error) {
4276 mlog_errno(error);
4277 goto out;
4278 }
4279
4280 error = ocfs2_inode_lock(inode, &old_bh, 1);
4281 if (error) {
4282 mlog_errno(error);
4283 goto out;
4284 }
4285
4286 down_write(&OCFS2_I(inode)->ip_xattr_sem);
4287 down_write(&OCFS2_I(inode)->ip_alloc_sem);
4288 error = __ocfs2_reflink(old_dentry, old_bh,
4289 new_orphan_inode, preserve);
4290 up_write(&OCFS2_I(inode)->ip_alloc_sem);
4291 up_write(&OCFS2_I(inode)->ip_xattr_sem);
4292
4293 ocfs2_inode_unlock(inode, 1);
4294 brelse(old_bh);
4295
4296 if (error) {
4297 mlog_errno(error);
4298 goto out;
4299 }
4300
4301 /* If the security isn't preserved, we need to re-initialize them. */
4302 if (!preserve) {
Eric Paris2a7dba32011-02-01 11:05:39 -05004303 error = ocfs2_init_security_and_acl(dir, new_orphan_inode,
4304 &new_dentry->d_name);
Tao Ma09bf27a2009-09-21 10:38:17 +08004305 if (error)
4306 mlog_errno(error);
4307 }
4308out:
4309 if (!error) {
4310 error = ocfs2_mv_orphaned_inode_to_new(dir, new_orphan_inode,
4311 new_dentry);
4312 if (error)
4313 mlog_errno(error);
4314 }
4315
4316 if (new_orphan_inode) {
4317 /*
4318 * We need to open_unlock the inode no matter whether we
4319 * succeed or not, so that other nodes can delete it later.
4320 */
4321 ocfs2_open_unlock(new_orphan_inode);
4322 if (error)
4323 iput(new_orphan_inode);
4324 }
4325
4326 return error;
4327}
Tao Mabd508732009-09-21 11:25:14 +08004328
4329/*
4330 * Below here are the bits used by OCFS2_IOC_REFLINK() to fake
4331 * sys_reflink(). This will go away when vfs_reflink() exists in
4332 * fs/namei.c.
4333 */
4334
4335/* copied from may_create in VFS. */
4336static inline int ocfs2_may_create(struct inode *dir, struct dentry *child)
4337{
4338 if (child->d_inode)
4339 return -EEXIST;
4340 if (IS_DEADDIR(dir))
4341 return -ENOENT;
4342 return inode_permission(dir, MAY_WRITE | MAY_EXEC);
4343}
4344
Tao Mabd508732009-09-21 11:25:14 +08004345/**
4346 * ocfs2_vfs_reflink - Create a reference-counted link
4347 *
4348 * @old_dentry: source dentry + inode
4349 * @dir: directory to create the target
4350 * @new_dentry: target dentry
4351 * @preserve: if true, preserve all file attributes
4352 */
Tao Ma12d4cec2009-11-30 15:08:40 +08004353static int ocfs2_vfs_reflink(struct dentry *old_dentry, struct inode *dir,
4354 struct dentry *new_dentry, bool preserve)
Tao Mabd508732009-09-21 11:25:14 +08004355{
4356 struct inode *inode = old_dentry->d_inode;
4357 int error;
4358
4359 if (!inode)
4360 return -ENOENT;
4361
4362 error = ocfs2_may_create(dir, new_dentry);
4363 if (error)
4364 return error;
4365
4366 if (dir->i_sb != inode->i_sb)
4367 return -EXDEV;
4368
4369 /*
4370 * A reflink to an append-only or immutable file cannot be created.
4371 */
4372 if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
4373 return -EPERM;
4374
4375 /* Only regular files can be reflinked. */
4376 if (!S_ISREG(inode->i_mode))
4377 return -EPERM;
4378
4379 /*
4380 * If the caller wants to preserve ownership, they require the
4381 * rights to do so.
4382 */
4383 if (preserve) {
Eric W. Biederman488c8ef2013-01-31 17:35:29 -08004384 if (!uid_eq(current_fsuid(), inode->i_uid) && !capable(CAP_CHOWN))
Tao Mabd508732009-09-21 11:25:14 +08004385 return -EPERM;
4386 if (!in_group_p(inode->i_gid) && !capable(CAP_CHOWN))
4387 return -EPERM;
4388 }
4389
4390 /*
4391 * If the caller is modifying any aspect of the attributes, they
4392 * are not creating a snapshot. They need read permission on the
4393 * file.
4394 */
4395 if (!preserve) {
4396 error = inode_permission(inode, MAY_READ);
4397 if (error)
4398 return error;
4399 }
4400
4401 mutex_lock(&inode->i_mutex);
Christoph Hellwig871a2932010-03-03 09:05:07 -05004402 dquot_initialize(dir);
Tao Mabd508732009-09-21 11:25:14 +08004403 error = ocfs2_reflink(old_dentry, dir, new_dentry, preserve);
4404 mutex_unlock(&inode->i_mutex);
4405 if (!error)
4406 fsnotify_create(dir, new_dentry);
4407 return error;
4408}
4409/*
4410 * Most codes are copied from sys_linkat.
4411 */
4412int ocfs2_reflink_ioctl(struct inode *inode,
4413 const char __user *oldname,
4414 const char __user *newname,
4415 bool preserve)
4416{
4417 struct dentry *new_dentry;
Al Virodae6ad82011-06-26 11:50:15 -04004418 struct path old_path, new_path;
Tao Mabd508732009-09-21 11:25:14 +08004419 int error;
Tao Mabd508732009-09-21 11:25:14 +08004420
4421 if (!ocfs2_refcount_tree(OCFS2_SB(inode->i_sb)))
4422 return -EOPNOTSUPP;
4423
4424 error = user_path_at(AT_FDCWD, oldname, 0, &old_path);
4425 if (error) {
4426 mlog_errno(error);
4427 return error;
4428 }
4429
Al Virodae6ad82011-06-26 11:50:15 -04004430 new_dentry = user_path_create(AT_FDCWD, newname, &new_path, 0);
4431 error = PTR_ERR(new_dentry);
4432 if (IS_ERR(new_dentry)) {
Tao Mabd508732009-09-21 11:25:14 +08004433 mlog_errno(error);
4434 goto out;
4435 }
4436
4437 error = -EXDEV;
Al Virodae6ad82011-06-26 11:50:15 -04004438 if (old_path.mnt != new_path.mnt) {
Tao Mabd508732009-09-21 11:25:14 +08004439 mlog_errno(error);
Al Virodae6ad82011-06-26 11:50:15 -04004440 goto out_dput;
Tao Mabd508732009-09-21 11:25:14 +08004441 }
4442
Tao Mabd508732009-09-21 11:25:14 +08004443 error = ocfs2_vfs_reflink(old_path.dentry,
Al Virodae6ad82011-06-26 11:50:15 -04004444 new_path.dentry->d_inode,
Tao Mabd508732009-09-21 11:25:14 +08004445 new_dentry, preserve);
Tao Mabd508732009-09-21 11:25:14 +08004446out_dput:
Al Viro921a1652012-07-20 01:15:31 +04004447 done_path_create(&new_path, new_dentry);
Tao Mabd508732009-09-21 11:25:14 +08004448out:
4449 path_put(&old_path);
4450
4451 return error;
4452}