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 return find_extent_buffer(&BTRFS_I(btree_inode
)->extent_tree
,
50 blocknr
* root
->sectorsize
,
51 root
->sectorsize
, GFP_NOFS
);
54 struct extent_buffer
*btrfs_find_create_tree_block(struct btrfs_root
*root
,
57 struct inode
*btree_inode
= root
->fs_info
->btree_inode
;
58 return alloc_extent_buffer(&BTRFS_I(btree_inode
)->extent_tree
,
59 blocknr
* root
->sectorsize
,
60 root
->sectorsize
, GFP_NOFS
);
63 struct extent_map
*btree_get_extent(struct inode
*inode
, struct page
*page
,
64 size_t page_offset
, u64 start
, u64 end
,
67 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
68 struct extent_map
*em
;
72 em
= lookup_extent_mapping(em_tree
, start
, end
);
76 em
= alloc_extent_map(GFP_NOFS
);
78 em
= ERR_PTR(-ENOMEM
);
82 em
->end
= (i_size_read(inode
) & ~((u64
)PAGE_CACHE_SIZE
-1)) - 1;
84 em
->block_end
= em
->end
;
85 em
->bdev
= inode
->i_sb
->s_bdev
;
86 ret
= add_extent_mapping(em_tree
, em
);
98 static int btree_writepage(struct page
*page
, struct writeback_control
*wbc
)
100 struct extent_map_tree
*tree
;
101 tree
= &BTRFS_I(page
->mapping
->host
)->extent_tree
;
102 return extent_write_full_page(tree
, page
, btree_get_extent
, wbc
);
104 int btree_readpage(struct file
*file
, struct page
*page
)
106 struct extent_map_tree
*tree
;
107 tree
= &BTRFS_I(page
->mapping
->host
)->extent_tree
;
108 return extent_read_full_page(tree
, page
, btree_get_extent
);
111 static int btree_releasepage(struct page
*page
, gfp_t unused_gfp_flags
)
113 struct extent_map_tree
*tree
;
116 BUG_ON(page
->private != 1);
117 tree
= &BTRFS_I(page
->mapping
->host
)->extent_tree
;
118 ret
= try_release_extent_mapping(tree
, page
);
120 ClearPagePrivate(page
);
121 set_page_private(page
, 0);
122 page_cache_release(page
);
127 static void btree_invalidatepage(struct page
*page
, unsigned long offset
)
129 struct extent_map_tree
*tree
;
130 tree
= &BTRFS_I(page
->mapping
->host
)->extent_tree
;
131 extent_invalidatepage(tree
, page
, offset
);
132 btree_releasepage(page
, GFP_NOFS
);
135 int btrfs_csum_data(struct btrfs_root
* root
, char *data
, size_t len
,
141 crc
= crc32c(0, data
, len
);
142 memcpy(result
, &crc
, BTRFS_CRC32_SIZE
);
148 static int csum_tree_block(struct btrfs_root
*root
, struct extent_buffer
*buf
,
152 char result
[BTRFS_CRC32_SIZE
];
154 struct btrfs_node
*node
;
156 ret
= btrfs_csum_data(root
, bh
->b_data
+ BTRFS_CSUM_SIZE
,
157 bh
->b_size
- BTRFS_CSUM_SIZE
, result
);
161 if (memcmp(bh
->b_data
, result
, BTRFS_CRC32_SIZE
)) {
162 printk("btrfs: %s checksum verify failed on %llu\n",
163 root
->fs_info
->sb
->s_id
,
164 (unsigned long long)bh_blocknr(bh
));
168 node
= btrfs_buffer_node(bh
);
169 memcpy(node
->header
.csum
, result
, BTRFS_CRC32_SIZE
);
176 static int btree_writepage(struct page
*page
, struct writeback_control
*wbc
)
178 struct buffer_head
*bh
;
179 struct btrfs_root
*root
= BTRFS_I(page
->mapping
->host
)->root
;
180 struct buffer_head
*head
;
181 if (!page_has_buffers(page
)) {
182 create_empty_buffers(page
, root
->fs_info
->sb
->s_blocksize
,
183 (1 << BH_Dirty
)|(1 << BH_Uptodate
));
185 head
= page_buffers(page
);
188 if (buffer_dirty(bh
))
189 csum_tree_block(root
, bh
, 0);
190 bh
= bh
->b_this_page
;
191 } while (bh
!= head
);
192 return block_write_full_page(page
, btree_get_block
, wbc
);
196 static struct address_space_operations btree_aops
= {
197 .readpage
= btree_readpage
,
198 .writepage
= btree_writepage
,
199 .releasepage
= btree_releasepage
,
200 .invalidatepage
= btree_invalidatepage
,
201 .sync_page
= block_sync_page
,
204 int readahead_tree_block(struct btrfs_root
*root
, u64 blocknr
)
206 struct extent_buffer
*buf
= NULL
;
207 struct inode
*btree_inode
= root
->fs_info
->btree_inode
;
210 buf
= btrfs_find_create_tree_block(root
, blocknr
);
213 read_extent_buffer_pages(&BTRFS_I(btree_inode
)->extent_tree
,
215 free_extent_buffer(buf
);
219 struct extent_buffer
*read_tree_block(struct btrfs_root
*root
, u64 blocknr
)
221 struct extent_buffer
*buf
= NULL
;
222 struct inode
*btree_inode
= root
->fs_info
->btree_inode
;
224 buf
= btrfs_find_create_tree_block(root
, blocknr
);
227 read_extent_buffer_pages(&BTRFS_I(btree_inode
)->extent_tree
,
232 int clean_tree_block(struct btrfs_trans_handle
*trans
, struct btrfs_root
*root
,
233 struct extent_buffer
*buf
)
235 struct inode
*btree_inode
= root
->fs_info
->btree_inode
;
236 clear_extent_buffer_dirty(&BTRFS_I(btree_inode
)->extent_tree
, buf
);
240 int wait_on_tree_block_writeback(struct btrfs_root
*root
,
241 struct extent_buffer
*buf
)
243 struct inode
*btree_inode
= root
->fs_info
->btree_inode
;
244 wait_on_extent_buffer_writeback(&BTRFS_I(btree_inode
)->extent_tree
,
249 int set_tree_block_dirty(struct btrfs_root
*root
, struct extent_buffer
*buf
)
251 struct inode
*btree_inode
= root
->fs_info
->btree_inode
;
252 set_extent_buffer_dirty(&BTRFS_I(btree_inode
)->extent_tree
, buf
);
256 static int __setup_root(int blocksize
,
257 struct btrfs_root
*root
,
258 struct btrfs_fs_info
*fs_info
,
263 root
->commit_root
= NULL
;
264 root
->sectorsize
= blocksize
;
265 root
->nodesize
= blocksize
;
266 root
->leafsize
= blocksize
;
268 root
->fs_info
= fs_info
;
269 root
->objectid
= objectid
;
270 root
->last_trans
= 0;
271 root
->highest_inode
= 0;
272 root
->last_inode_alloc
= 0;
274 memset(&root
->root_key
, 0, sizeof(root
->root_key
));
275 memset(&root
->root_item
, 0, sizeof(root
->root_item
));
276 memset(&root
->defrag_progress
, 0, sizeof(root
->defrag_progress
));
277 memset(&root
->root_kobj
, 0, sizeof(root
->root_kobj
));
278 init_completion(&root
->kobj_unregister
);
279 init_rwsem(&root
->snap_sem
);
280 root
->defrag_running
= 0;
281 root
->defrag_level
= 0;
282 root
->root_key
.objectid
= objectid
;
286 static int find_and_setup_root(int blocksize
,
287 struct btrfs_root
*tree_root
,
288 struct btrfs_fs_info
*fs_info
,
290 struct btrfs_root
*root
)
294 __setup_root(blocksize
, root
, fs_info
, objectid
);
295 ret
= btrfs_find_last_root(tree_root
, objectid
,
296 &root
->root_item
, &root
->root_key
);
299 root
->node
= read_tree_block(root
,
300 btrfs_root_blocknr(&root
->root_item
));
305 struct btrfs_root
*btrfs_read_fs_root_no_radix(struct btrfs_fs_info
*fs_info
,
306 struct btrfs_key
*location
)
308 struct btrfs_root
*root
;
309 struct btrfs_root
*tree_root
= fs_info
->tree_root
;
310 struct btrfs_path
*path
;
311 struct extent_buffer
*l
;
315 root
= kzalloc(sizeof(*root
), GFP_NOFS
);
317 return ERR_PTR(-ENOMEM
);
318 if (location
->offset
== (u64
)-1) {
319 ret
= find_and_setup_root(fs_info
->sb
->s_blocksize
,
320 fs_info
->tree_root
, fs_info
,
321 location
->objectid
, root
);
329 __setup_root(fs_info
->sb
->s_blocksize
, root
, fs_info
,
332 path
= btrfs_alloc_path();
334 ret
= btrfs_search_slot(NULL
, tree_root
, location
, path
, 0, 0);
341 read_extent_buffer(l
, &root
->root_item
,
342 btrfs_item_ptr_offset(l
, path
->slots
[0]),
343 sizeof(root
->root_item
));
346 btrfs_release_path(root
, path
);
347 btrfs_free_path(path
);
352 root
->node
= read_tree_block(root
,
353 btrfs_root_blocknr(&root
->root_item
));
357 ret
= btrfs_find_highest_inode(root
, &highest_inode
);
359 root
->highest_inode
= highest_inode
;
360 root
->last_inode_alloc
= highest_inode
;
365 struct btrfs_root
*btrfs_read_fs_root(struct btrfs_fs_info
*fs_info
,
366 struct btrfs_key
*location
,
367 const char *name
, int namelen
)
369 struct btrfs_root
*root
;
372 root
= radix_tree_lookup(&fs_info
->fs_roots_radix
,
373 (unsigned long)location
->objectid
);
377 root
= btrfs_read_fs_root_no_radix(fs_info
, location
);
380 ret
= radix_tree_insert(&fs_info
->fs_roots_radix
,
381 (unsigned long)root
->root_key
.objectid
,
384 free_extent_buffer(root
->node
);
389 ret
= btrfs_set_root_name(root
, name
, namelen
);
391 free_extent_buffer(root
->node
);
396 ret
= btrfs_sysfs_add_root(root
);
398 free_extent_buffer(root
->node
);
404 ret
= btrfs_find_dead_roots(fs_info
->tree_root
,
405 root
->root_key
.objectid
, root
);
411 struct btrfs_root
*open_ctree(struct super_block
*sb
)
413 struct btrfs_root
*extent_root
= kmalloc(sizeof(struct btrfs_root
),
415 struct btrfs_root
*tree_root
= kmalloc(sizeof(struct btrfs_root
),
417 struct btrfs_fs_info
*fs_info
= kmalloc(sizeof(*fs_info
),
421 struct btrfs_super_block
*disk_super
;
423 if (!extent_root
|| !tree_root
|| !fs_info
) {
427 init_bit_radix(&fs_info
->pinned_radix
);
428 init_bit_radix(&fs_info
->pending_del_radix
);
429 init_bit_radix(&fs_info
->extent_map_radix
);
430 init_bit_radix(&fs_info
->extent_ins_radix
);
431 INIT_RADIX_TREE(&fs_info
->fs_roots_radix
, GFP_NOFS
);
432 INIT_RADIX_TREE(&fs_info
->block_group_radix
, GFP_KERNEL
);
433 INIT_RADIX_TREE(&fs_info
->block_group_data_radix
, GFP_KERNEL
);
434 INIT_LIST_HEAD(&fs_info
->trans_list
);
435 INIT_LIST_HEAD(&fs_info
->dead_roots
);
436 memset(&fs_info
->super_kobj
, 0, sizeof(fs_info
->super_kobj
));
437 init_completion(&fs_info
->kobj_unregister
);
438 sb_set_blocksize(sb
, 4096);
439 fs_info
->running_transaction
= NULL
;
440 fs_info
->last_trans_committed
= 0;
441 fs_info
->tree_root
= tree_root
;
442 fs_info
->extent_root
= extent_root
;
444 fs_info
->btree_inode
= new_inode(sb
);
445 fs_info
->btree_inode
->i_ino
= 1;
446 fs_info
->btree_inode
->i_nlink
= 1;
447 fs_info
->btree_inode
->i_size
= sb
->s_bdev
->bd_inode
->i_size
;
448 fs_info
->btree_inode
->i_mapping
->a_ops
= &btree_aops
;
449 extent_map_tree_init(&BTRFS_I(fs_info
->btree_inode
)->extent_tree
,
450 fs_info
->btree_inode
->i_mapping
,
452 fs_info
->do_barriers
= 1;
453 fs_info
->closing
= 0;
455 INIT_DELAYED_WORK(&fs_info
->trans_work
, btrfs_transaction_cleaner
);
456 BTRFS_I(fs_info
->btree_inode
)->root
= tree_root
;
457 memset(&BTRFS_I(fs_info
->btree_inode
)->location
, 0,
458 sizeof(struct btrfs_key
));
459 insert_inode_hash(fs_info
->btree_inode
);
460 mapping_set_gfp_mask(fs_info
->btree_inode
->i_mapping
, GFP_NOFS
);
462 mutex_init(&fs_info
->trans_mutex
);
463 mutex_init(&fs_info
->fs_mutex
);
465 __setup_root(sb
->s_blocksize
, tree_root
,
466 fs_info
, BTRFS_ROOT_TREE_OBJECTID
);
468 fs_info
->sb_buffer
= read_tree_block(tree_root
,
469 BTRFS_SUPER_INFO_OFFSET
/
472 if (!fs_info
->sb_buffer
)
475 read_extent_buffer(fs_info
->sb_buffer
, &fs_info
->super_copy
, 0,
476 sizeof(fs_info
->super_copy
));
478 read_extent_buffer(fs_info
->sb_buffer
, fs_info
->fsid
,
479 (unsigned long)btrfs_super_fsid(fs_info
->sb_buffer
),
481 disk_super
= &fs_info
->super_copy
;
482 if (!btrfs_super_root(disk_super
))
485 i_size_write(fs_info
->btree_inode
,
486 btrfs_super_total_blocks(disk_super
) <<
487 fs_info
->btree_inode
->i_blkbits
);
490 if (strncmp((char *)(&disk_super
->magic
), BTRFS_MAGIC
,
491 sizeof(disk_super
->magic
))) {
492 printk("btrfs: valid FS not found on %s\n", sb
->s_id
);
495 tree_root
->node
= read_tree_block(tree_root
,
496 btrfs_super_root(disk_super
));
497 if (!tree_root
->node
)
500 mutex_lock(&fs_info
->fs_mutex
);
501 ret
= find_and_setup_root(sb
->s_blocksize
, tree_root
, fs_info
,
502 BTRFS_EXTENT_TREE_OBJECTID
, extent_root
);
504 mutex_unlock(&fs_info
->fs_mutex
);
508 btrfs_read_block_groups(extent_root
);
510 fs_info
->generation
= btrfs_super_generation(disk_super
) + 1;
511 mutex_unlock(&fs_info
->fs_mutex
);
515 free_extent_buffer(tree_root
->node
);
517 free_extent_buffer(fs_info
->sb_buffer
);
519 iput(fs_info
->btree_inode
);
527 int write_ctree_super(struct btrfs_trans_handle
*trans
, struct btrfs_root
531 struct extent_buffer
*super
= root
->fs_info
->sb_buffer
;
532 struct inode
*btree_inode
= root
->fs_info
->btree_inode
;
534 set_extent_buffer_dirty(&BTRFS_I(btree_inode
)->extent_tree
, super
);
535 ret
= sync_page_range_nolock(btree_inode
, btree_inode
->i_mapping
,
536 super
->start
, super
->len
);
540 int btrfs_free_fs_root(struct btrfs_fs_info
*fs_info
, struct btrfs_root
*root
)
542 radix_tree_delete(&fs_info
->fs_roots_radix
,
543 (unsigned long)root
->root_key
.objectid
);
544 btrfs_sysfs_del_root(root
);
548 free_extent_buffer(root
->node
);
549 if (root
->commit_root
)
550 free_extent_buffer(root
->commit_root
);
557 static int del_fs_roots(struct btrfs_fs_info
*fs_info
)
560 struct btrfs_root
*gang
[8];
564 ret
= radix_tree_gang_lookup(&fs_info
->fs_roots_radix
,
569 for (i
= 0; i
< ret
; i
++)
570 btrfs_free_fs_root(fs_info
, gang
[i
]);
575 int close_ctree(struct btrfs_root
*root
)
578 struct btrfs_trans_handle
*trans
;
579 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
581 fs_info
->closing
= 1;
582 btrfs_transaction_flush_work(root
);
583 mutex_lock(&fs_info
->fs_mutex
);
584 btrfs_defrag_dirty_roots(root
->fs_info
);
585 trans
= btrfs_start_transaction(root
, 1);
586 ret
= btrfs_commit_transaction(trans
, root
);
587 /* run commit again to drop the original snapshot */
588 trans
= btrfs_start_transaction(root
, 1);
589 btrfs_commit_transaction(trans
, root
);
590 ret
= btrfs_write_and_wait_transaction(NULL
, root
);
592 write_ctree_super(NULL
, root
);
593 mutex_unlock(&fs_info
->fs_mutex
);
595 if (fs_info
->extent_root
->node
)
596 free_extent_buffer(fs_info
->extent_root
->node
);
597 if (fs_info
->tree_root
->node
)
598 free_extent_buffer(fs_info
->tree_root
->node
);
599 free_extent_buffer(fs_info
->sb_buffer
);
600 truncate_inode_pages(fs_info
->btree_inode
->i_mapping
, 0);
601 iput(fs_info
->btree_inode
);
603 btrfs_free_block_groups(root
->fs_info
);
604 del_fs_roots(fs_info
);
605 kfree(fs_info
->extent_root
);
606 kfree(fs_info
->tree_root
);
610 int btrfs_buffer_uptodate(struct extent_buffer
*buf
)
612 struct inode
*btree_inode
= buf
->pages
[0]->mapping
->host
;
613 return extent_buffer_uptodate(&BTRFS_I(btree_inode
)->extent_tree
, buf
);
616 int btrfs_set_buffer_uptodate(struct extent_buffer
*buf
)
618 struct inode
*btree_inode
= buf
->pages
[0]->mapping
->host
;
619 return set_extent_buffer_uptodate(&BTRFS_I(btree_inode
)->extent_tree
,
623 void btrfs_mark_buffer_dirty(struct extent_buffer
*buf
)
625 struct btrfs_root
*root
= BTRFS_I(buf
->pages
[0]->mapping
->host
)->root
;
626 u64 transid
= btrfs_header_generation(buf
);
627 struct inode
*btree_inode
= root
->fs_info
->btree_inode
;
629 if (transid
!= root
->fs_info
->generation
) {
630 printk(KERN_CRIT
"transid mismatch buffer %llu, found %Lu running %Lu\n",
631 (unsigned long long)extent_buffer_blocknr(buf
),
632 transid
, root
->fs_info
->generation
);
635 set_extent_buffer_dirty(&BTRFS_I(btree_inode
)->extent_tree
, buf
);
638 void btrfs_btree_balance_dirty(struct btrfs_root
*root
, unsigned long nr
)
640 balance_dirty_pages_ratelimited_nr(
641 root
->fs_info
->btree_inode
->i_mapping
, nr
);