2 * Copyright (C) 2007 Oracle. All rights reserved.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public
6 * License v2 as published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
13 * You should have received a copy of the GNU General Public
14 * License along with this program; if not, write to the
15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
16 * Boston, MA 021110-1307, USA.
20 #include <linux/blkdev.h>
21 #include <linux/crc32c.h>
22 #include <linux/scatterlist.h>
23 #include <linux/swap.h>
24 #include <linux/radix-tree.h>
25 #include <linux/writeback.h>
26 #include <linux/buffer_head.h> // for block_sync_page
29 #include "transaction.h"
30 #include "btrfs_inode.h"
33 static int check_tree_block(struct btrfs_root
*root
, struct extent_buffer
*buf
)
35 if (extent_buffer_blocknr(buf
) != btrfs_header_blocknr(buf
)) {
36 printk(KERN_CRIT
"buf blocknr(buf) is %llu, header is %llu\n",
37 (unsigned long long)extent_buffer_blocknr(buf
),
38 (unsigned long long)btrfs_header_blocknr(buf
));
45 struct extent_buffer
*btrfs_find_tree_block(struct btrfs_root
*root
,
48 struct inode
*btree_inode
= root
->fs_info
->btree_inode
;
49 struct extent_buffer
*eb
;
50 eb
= find_extent_buffer(&BTRFS_I(btree_inode
)->extent_tree
,
51 blocknr
* root
->sectorsize
,
52 root
->sectorsize
, GFP_NOFS
);
54 eb
->alloc_addr
= (unsigned long)__builtin_return_address(0);
58 struct extent_buffer
*btrfs_find_create_tree_block(struct btrfs_root
*root
,
61 struct inode
*btree_inode
= root
->fs_info
->btree_inode
;
62 struct extent_buffer
*eb
;
63 eb
= alloc_extent_buffer(&BTRFS_I(btree_inode
)->extent_tree
,
64 blocknr
* root
->sectorsize
,
65 root
->sectorsize
, GFP_NOFS
);
66 eb
->alloc_addr
= (unsigned long)__builtin_return_address(0);
70 struct extent_map
*btree_get_extent(struct inode
*inode
, struct page
*page
,
71 size_t page_offset
, u64 start
, u64 end
,
74 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
75 struct extent_map
*em
;
79 em
= lookup_extent_mapping(em_tree
, start
, end
);
83 em
= alloc_extent_map(GFP_NOFS
);
85 em
= ERR_PTR(-ENOMEM
);
89 em
->end
= (i_size_read(inode
) & ~((u64
)PAGE_CACHE_SIZE
-1)) - 1;
91 em
->block_end
= em
->end
;
92 em
->bdev
= inode
->i_sb
->s_bdev
;
93 ret
= add_extent_mapping(em_tree
, em
);
105 static int btree_writepage(struct page
*page
, struct writeback_control
*wbc
)
107 struct extent_map_tree
*tree
;
108 tree
= &BTRFS_I(page
->mapping
->host
)->extent_tree
;
109 return extent_write_full_page(tree
, page
, btree_get_extent
, wbc
);
111 int btree_readpage(struct file
*file
, struct page
*page
)
113 struct extent_map_tree
*tree
;
114 tree
= &BTRFS_I(page
->mapping
->host
)->extent_tree
;
115 return extent_read_full_page(tree
, page
, btree_get_extent
);
118 static int btree_releasepage(struct page
*page
, gfp_t unused_gfp_flags
)
120 struct extent_map_tree
*tree
;
123 BUG_ON(page
->private != 1);
124 tree
= &BTRFS_I(page
->mapping
->host
)->extent_tree
;
125 ret
= try_release_extent_mapping(tree
, page
);
127 ClearPagePrivate(page
);
128 set_page_private(page
, 0);
129 page_cache_release(page
);
134 static void btree_invalidatepage(struct page
*page
, unsigned long offset
)
136 struct extent_map_tree
*tree
;
137 tree
= &BTRFS_I(page
->mapping
->host
)->extent_tree
;
138 extent_invalidatepage(tree
, page
, offset
);
139 btree_releasepage(page
, GFP_NOFS
);
142 int btrfs_csum_data(struct btrfs_root
* root
, char *data
, size_t len
,
148 crc
= crc32c(0, data
, len
);
149 memcpy(result
, &crc
, BTRFS_CRC32_SIZE
);
155 static int csum_tree_block(struct btrfs_root
*root
, struct extent_buffer
*buf
,
159 char result
[BTRFS_CRC32_SIZE
];
161 struct btrfs_node
*node
;
163 ret
= btrfs_csum_data(root
, bh
->b_data
+ BTRFS_CSUM_SIZE
,
164 bh
->b_size
- BTRFS_CSUM_SIZE
, result
);
168 if (memcmp(bh
->b_data
, result
, BTRFS_CRC32_SIZE
)) {
169 printk("btrfs: %s checksum verify failed on %llu\n",
170 root
->fs_info
->sb
->s_id
,
171 (unsigned long long)bh_blocknr(bh
));
175 node
= btrfs_buffer_node(bh
);
176 memcpy(node
->header
.csum
, result
, BTRFS_CRC32_SIZE
);
183 static int btree_writepage(struct page
*page
, struct writeback_control
*wbc
)
185 struct buffer_head
*bh
;
186 struct btrfs_root
*root
= BTRFS_I(page
->mapping
->host
)->root
;
187 struct buffer_head
*head
;
188 if (!page_has_buffers(page
)) {
189 create_empty_buffers(page
, root
->fs_info
->sb
->s_blocksize
,
190 (1 << BH_Dirty
)|(1 << BH_Uptodate
));
192 head
= page_buffers(page
);
195 if (buffer_dirty(bh
))
196 csum_tree_block(root
, bh
, 0);
197 bh
= bh
->b_this_page
;
198 } while (bh
!= head
);
199 return block_write_full_page(page
, btree_get_block
, wbc
);
203 static struct address_space_operations btree_aops
= {
204 .readpage
= btree_readpage
,
205 .writepage
= btree_writepage
,
206 .releasepage
= btree_releasepage
,
207 .invalidatepage
= btree_invalidatepage
,
208 .sync_page
= block_sync_page
,
211 int readahead_tree_block(struct btrfs_root
*root
, u64 blocknr
)
213 struct extent_buffer
*buf
= NULL
;
214 struct inode
*btree_inode
= root
->fs_info
->btree_inode
;
217 buf
= btrfs_find_create_tree_block(root
, blocknr
);
220 read_extent_buffer_pages(&BTRFS_I(btree_inode
)->extent_tree
,
222 free_extent_buffer(buf
);
226 struct extent_buffer
*read_tree_block(struct btrfs_root
*root
, u64 blocknr
)
228 struct extent_buffer
*buf
= NULL
;
229 struct inode
*btree_inode
= root
->fs_info
->btree_inode
;
231 buf
= btrfs_find_create_tree_block(root
, blocknr
);
234 read_extent_buffer_pages(&BTRFS_I(btree_inode
)->extent_tree
,
236 buf
->alloc_addr
= (unsigned long)__builtin_return_address(0);
240 int clean_tree_block(struct btrfs_trans_handle
*trans
, struct btrfs_root
*root
,
241 struct extent_buffer
*buf
)
243 struct inode
*btree_inode
= root
->fs_info
->btree_inode
;
244 clear_extent_buffer_dirty(&BTRFS_I(btree_inode
)->extent_tree
, buf
);
248 int wait_on_tree_block_writeback(struct btrfs_root
*root
,
249 struct extent_buffer
*buf
)
251 struct inode
*btree_inode
= root
->fs_info
->btree_inode
;
252 wait_on_extent_buffer_writeback(&BTRFS_I(btree_inode
)->extent_tree
,
257 int set_tree_block_dirty(struct btrfs_root
*root
, struct extent_buffer
*buf
)
259 struct inode
*btree_inode
= root
->fs_info
->btree_inode
;
260 set_extent_buffer_dirty(&BTRFS_I(btree_inode
)->extent_tree
, buf
);
264 static int __setup_root(int blocksize
,
265 struct btrfs_root
*root
,
266 struct btrfs_fs_info
*fs_info
,
271 root
->commit_root
= NULL
;
272 root
->sectorsize
= blocksize
;
273 root
->nodesize
= blocksize
;
274 root
->leafsize
= blocksize
;
276 root
->fs_info
= fs_info
;
277 root
->objectid
= objectid
;
278 root
->last_trans
= 0;
279 root
->highest_inode
= 0;
280 root
->last_inode_alloc
= 0;
282 memset(&root
->root_key
, 0, sizeof(root
->root_key
));
283 memset(&root
->root_item
, 0, sizeof(root
->root_item
));
284 memset(&root
->defrag_progress
, 0, sizeof(root
->defrag_progress
));
285 memset(&root
->root_kobj
, 0, sizeof(root
->root_kobj
));
286 init_completion(&root
->kobj_unregister
);
287 init_rwsem(&root
->snap_sem
);
288 root
->defrag_running
= 0;
289 root
->defrag_level
= 0;
290 root
->root_key
.objectid
= objectid
;
294 static int find_and_setup_root(int blocksize
,
295 struct btrfs_root
*tree_root
,
296 struct btrfs_fs_info
*fs_info
,
298 struct btrfs_root
*root
)
302 __setup_root(blocksize
, root
, fs_info
, objectid
);
303 ret
= btrfs_find_last_root(tree_root
, objectid
,
304 &root
->root_item
, &root
->root_key
);
307 root
->node
= read_tree_block(root
,
308 btrfs_root_blocknr(&root
->root_item
));
313 struct btrfs_root
*btrfs_read_fs_root_no_radix(struct btrfs_fs_info
*fs_info
,
314 struct btrfs_key
*location
)
316 struct btrfs_root
*root
;
317 struct btrfs_root
*tree_root
= fs_info
->tree_root
;
318 struct btrfs_path
*path
;
319 struct extent_buffer
*l
;
323 root
= kzalloc(sizeof(*root
), GFP_NOFS
);
325 return ERR_PTR(-ENOMEM
);
326 if (location
->offset
== (u64
)-1) {
327 ret
= find_and_setup_root(fs_info
->sb
->s_blocksize
,
328 fs_info
->tree_root
, fs_info
,
329 location
->objectid
, root
);
337 __setup_root(fs_info
->sb
->s_blocksize
, root
, fs_info
,
340 path
= btrfs_alloc_path();
342 ret
= btrfs_search_slot(NULL
, tree_root
, location
, path
, 0, 0);
349 read_extent_buffer(l
, &root
->root_item
,
350 btrfs_item_ptr_offset(l
, path
->slots
[0]),
351 sizeof(root
->root_item
));
354 btrfs_release_path(root
, path
);
355 btrfs_free_path(path
);
360 root
->node
= read_tree_block(root
,
361 btrfs_root_blocknr(&root
->root_item
));
365 ret
= btrfs_find_highest_inode(root
, &highest_inode
);
367 root
->highest_inode
= highest_inode
;
368 root
->last_inode_alloc
= highest_inode
;
373 struct btrfs_root
*btrfs_read_fs_root(struct btrfs_fs_info
*fs_info
,
374 struct btrfs_key
*location
,
375 const char *name
, int namelen
)
377 struct btrfs_root
*root
;
380 root
= radix_tree_lookup(&fs_info
->fs_roots_radix
,
381 (unsigned long)location
->objectid
);
385 root
= btrfs_read_fs_root_no_radix(fs_info
, location
);
388 ret
= radix_tree_insert(&fs_info
->fs_roots_radix
,
389 (unsigned long)root
->root_key
.objectid
,
392 free_extent_buffer(root
->node
);
397 ret
= btrfs_set_root_name(root
, name
, namelen
);
399 free_extent_buffer(root
->node
);
404 ret
= btrfs_sysfs_add_root(root
);
406 free_extent_buffer(root
->node
);
412 ret
= btrfs_find_dead_roots(fs_info
->tree_root
,
413 root
->root_key
.objectid
, root
);
419 struct btrfs_root
*open_ctree(struct super_block
*sb
)
421 struct btrfs_root
*extent_root
= kmalloc(sizeof(struct btrfs_root
),
423 struct btrfs_root
*tree_root
= kmalloc(sizeof(struct btrfs_root
),
425 struct btrfs_fs_info
*fs_info
= kmalloc(sizeof(*fs_info
),
429 struct btrfs_super_block
*disk_super
;
431 if (!extent_root
|| !tree_root
|| !fs_info
) {
435 init_bit_radix(&fs_info
->pinned_radix
);
436 init_bit_radix(&fs_info
->pending_del_radix
);
437 init_bit_radix(&fs_info
->extent_ins_radix
);
438 INIT_RADIX_TREE(&fs_info
->fs_roots_radix
, GFP_NOFS
);
439 INIT_RADIX_TREE(&fs_info
->block_group_radix
, GFP_KERNEL
);
440 INIT_RADIX_TREE(&fs_info
->block_group_data_radix
, GFP_KERNEL
);
441 INIT_LIST_HEAD(&fs_info
->trans_list
);
442 INIT_LIST_HEAD(&fs_info
->dead_roots
);
443 memset(&fs_info
->super_kobj
, 0, sizeof(fs_info
->super_kobj
));
444 init_completion(&fs_info
->kobj_unregister
);
445 sb_set_blocksize(sb
, 4096);
446 fs_info
->running_transaction
= NULL
;
447 fs_info
->last_trans_committed
= 0;
448 fs_info
->tree_root
= tree_root
;
449 fs_info
->extent_root
= extent_root
;
451 fs_info
->btree_inode
= new_inode(sb
);
452 fs_info
->btree_inode
->i_ino
= 1;
453 fs_info
->btree_inode
->i_nlink
= 1;
454 fs_info
->btree_inode
->i_size
= sb
->s_bdev
->bd_inode
->i_size
;
455 fs_info
->btree_inode
->i_mapping
->a_ops
= &btree_aops
;
456 extent_map_tree_init(&BTRFS_I(fs_info
->btree_inode
)->extent_tree
,
457 fs_info
->btree_inode
->i_mapping
,
459 extent_map_tree_init(&fs_info
->free_space_cache
,
460 fs_info
->btree_inode
->i_mapping
, GFP_NOFS
);
461 fs_info
->do_barriers
= 1;
462 fs_info
->closing
= 0;
464 INIT_DELAYED_WORK(&fs_info
->trans_work
, btrfs_transaction_cleaner
);
465 BTRFS_I(fs_info
->btree_inode
)->root
= tree_root
;
466 memset(&BTRFS_I(fs_info
->btree_inode
)->location
, 0,
467 sizeof(struct btrfs_key
));
468 insert_inode_hash(fs_info
->btree_inode
);
469 mapping_set_gfp_mask(fs_info
->btree_inode
->i_mapping
, GFP_NOFS
);
471 mutex_init(&fs_info
->trans_mutex
);
472 mutex_init(&fs_info
->fs_mutex
);
474 __setup_root(sb
->s_blocksize
, tree_root
,
475 fs_info
, BTRFS_ROOT_TREE_OBJECTID
);
477 fs_info
->sb_buffer
= read_tree_block(tree_root
,
478 BTRFS_SUPER_INFO_OFFSET
/
481 if (!fs_info
->sb_buffer
)
484 read_extent_buffer(fs_info
->sb_buffer
, &fs_info
->super_copy
, 0,
485 sizeof(fs_info
->super_copy
));
487 read_extent_buffer(fs_info
->sb_buffer
, fs_info
->fsid
,
488 (unsigned long)btrfs_super_fsid(fs_info
->sb_buffer
),
490 disk_super
= &fs_info
->super_copy
;
491 if (!btrfs_super_root(disk_super
))
494 i_size_write(fs_info
->btree_inode
,
495 btrfs_super_total_blocks(disk_super
) <<
496 fs_info
->btree_inode
->i_blkbits
);
499 if (strncmp((char *)(&disk_super
->magic
), BTRFS_MAGIC
,
500 sizeof(disk_super
->magic
))) {
501 printk("btrfs: valid FS not found on %s\n", sb
->s_id
);
504 tree_root
->node
= read_tree_block(tree_root
,
505 btrfs_super_root(disk_super
));
506 if (!tree_root
->node
)
509 mutex_lock(&fs_info
->fs_mutex
);
510 ret
= find_and_setup_root(sb
->s_blocksize
, tree_root
, fs_info
,
511 BTRFS_EXTENT_TREE_OBJECTID
, extent_root
);
513 mutex_unlock(&fs_info
->fs_mutex
);
517 btrfs_read_block_groups(extent_root
);
519 fs_info
->generation
= btrfs_super_generation(disk_super
) + 1;
520 mutex_unlock(&fs_info
->fs_mutex
);
524 free_extent_buffer(tree_root
->node
);
526 free_extent_buffer(fs_info
->sb_buffer
);
528 iput(fs_info
->btree_inode
);
536 int write_ctree_super(struct btrfs_trans_handle
*trans
, struct btrfs_root
540 struct extent_buffer
*super
= root
->fs_info
->sb_buffer
;
541 struct inode
*btree_inode
= root
->fs_info
->btree_inode
;
543 set_extent_buffer_dirty(&BTRFS_I(btree_inode
)->extent_tree
, super
);
544 ret
= sync_page_range_nolock(btree_inode
, btree_inode
->i_mapping
,
545 super
->start
, super
->len
);
549 int btrfs_free_fs_root(struct btrfs_fs_info
*fs_info
, struct btrfs_root
*root
)
551 radix_tree_delete(&fs_info
->fs_roots_radix
,
552 (unsigned long)root
->root_key
.objectid
);
553 btrfs_sysfs_del_root(root
);
557 free_extent_buffer(root
->node
);
558 if (root
->commit_root
)
559 free_extent_buffer(root
->commit_root
);
566 static int del_fs_roots(struct btrfs_fs_info
*fs_info
)
569 struct btrfs_root
*gang
[8];
573 ret
= radix_tree_gang_lookup(&fs_info
->fs_roots_radix
,
578 for (i
= 0; i
< ret
; i
++)
579 btrfs_free_fs_root(fs_info
, gang
[i
]);
584 int close_ctree(struct btrfs_root
*root
)
587 struct btrfs_trans_handle
*trans
;
588 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
590 fs_info
->closing
= 1;
591 btrfs_transaction_flush_work(root
);
592 mutex_lock(&fs_info
->fs_mutex
);
593 btrfs_defrag_dirty_roots(root
->fs_info
);
594 trans
= btrfs_start_transaction(root
, 1);
595 ret
= btrfs_commit_transaction(trans
, root
);
596 /* run commit again to drop the original snapshot */
597 trans
= btrfs_start_transaction(root
, 1);
598 btrfs_commit_transaction(trans
, root
);
599 ret
= btrfs_write_and_wait_transaction(NULL
, root
);
601 write_ctree_super(NULL
, root
);
602 mutex_unlock(&fs_info
->fs_mutex
);
604 if (fs_info
->extent_root
->node
)
605 free_extent_buffer(fs_info
->extent_root
->node
);
607 if (fs_info
->tree_root
->node
)
608 free_extent_buffer(fs_info
->tree_root
->node
);
610 free_extent_buffer(fs_info
->sb_buffer
);
611 truncate_inode_pages(fs_info
->btree_inode
->i_mapping
, 0);
612 iput(fs_info
->btree_inode
);
614 btrfs_free_block_groups(root
->fs_info
);
615 del_fs_roots(fs_info
);
616 kfree(fs_info
->extent_root
);
617 kfree(fs_info
->tree_root
);
621 int btrfs_buffer_uptodate(struct extent_buffer
*buf
)
623 struct inode
*btree_inode
= buf
->first_page
->mapping
->host
;
624 return extent_buffer_uptodate(&BTRFS_I(btree_inode
)->extent_tree
, buf
);
627 int btrfs_set_buffer_uptodate(struct extent_buffer
*buf
)
629 struct inode
*btree_inode
= buf
->first_page
->mapping
->host
;
630 return set_extent_buffer_uptodate(&BTRFS_I(btree_inode
)->extent_tree
,
634 void btrfs_mark_buffer_dirty(struct extent_buffer
*buf
)
636 struct btrfs_root
*root
= BTRFS_I(buf
->first_page
->mapping
->host
)->root
;
637 u64 transid
= btrfs_header_generation(buf
);
638 struct inode
*btree_inode
= root
->fs_info
->btree_inode
;
640 if (transid
!= root
->fs_info
->generation
) {
641 printk(KERN_CRIT
"transid mismatch buffer %llu, found %Lu running %Lu\n",
642 (unsigned long long)extent_buffer_blocknr(buf
),
643 transid
, root
->fs_info
->generation
);
646 set_extent_buffer_dirty(&BTRFS_I(btree_inode
)->extent_tree
, buf
);
649 void btrfs_btree_balance_dirty(struct btrfs_root
*root
, unsigned long nr
)
651 balance_dirty_pages_ratelimited_nr(
652 root
->fs_info
->btree_inode
->i_mapping
, nr
);