blob: 5ce2a7da8b113fef13456687fdf4243fa9f1c2ba [file] [log] [blame]
Chris Mason6cbd5572007-06-12 09:07:21 -04001/*
2 * Copyright (C) 2007 Oracle. All rights reserved.
3 *
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.
7 *
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.
12 *
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.
17 */
18
Chris Masoneb60cea2007-02-02 09:18:22 -050019#ifndef __DISKIO__
20#define __DISKIO__
21
Yan Zhenga512bbf2008-12-08 16:46:26 -050022#define BTRFS_SUPER_INFO_OFFSET (64 * 1024)
Chris Masonf2984462008-04-10 16:19:33 -040023#define BTRFS_SUPER_INFO_SIZE 4096
Yan Zhenga512bbf2008-12-08 16:46:26 -050024
25#define BTRFS_SUPER_MIRROR_MAX 3
26#define BTRFS_SUPER_MIRROR_SHIFT 12
27
David Woodhouse53b381b2013-01-29 18:40:14 -050028enum {
29 BTRFS_WQ_ENDIO_DATA = 0,
30 BTRFS_WQ_ENDIO_METADATA = 1,
31 BTRFS_WQ_ENDIO_FREE_SPACE = 2,
32 BTRFS_WQ_ENDIO_RAID56 = 3,
33};
34
Yan Zhenga512bbf2008-12-08 16:46:26 -050035static inline u64 btrfs_sb_offset(int mirror)
36{
37 u64 start = 16 * 1024;
38 if (mirror)
39 return start << (BTRFS_SUPER_MIRROR_SHIFT * mirror);
40 return BTRFS_SUPER_INFO_OFFSET;
41}
42
Chris Mason0b86a832008-03-24 15:01:56 -040043struct btrfs_device;
Chris Mason8a4b83c2008-03-24 15:02:07 -040044struct btrfs_fs_devices;
Chris Masoneb60cea2007-02-02 09:18:22 -050045
Chris Masondb945352007-10-15 16:15:53 -040046struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr,
Chris Masonca7a79a2008-05-12 12:59:19 -040047 u32 blocksize, u64 parent_transid);
48int readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize,
49 u64 parent_transid);
Arne Jansenab0fff02011-05-23 14:25:41 +020050int reada_tree_block_flagged(struct btrfs_root *root, u64 bytenr, u32 blocksize,
51 int mirror_num, struct extent_buffer **eb);
Chris Mason5f39d392007-10-15 16:14:19 -040052struct extent_buffer *btrfs_find_create_tree_block(struct btrfs_root *root,
Chris Masondb945352007-10-15 16:15:53 -040053 u64 bytenr, u32 blocksize);
Jeff Mahoneyd5c13f92012-03-01 14:56:27 +010054void clean_tree_block(struct btrfs_trans_handle *trans,
55 struct btrfs_root *root, struct extent_buffer *buf);
Al Viroad2b2c82011-11-17 01:10:02 -050056int open_ctree(struct super_block *sb,
57 struct btrfs_fs_devices *fs_devices,
58 char *options);
Chris Masone20d96d2007-03-22 12:13:20 -040059int close_ctree(struct btrfs_root *root);
Chris Mason79154b12007-03-22 15:59:16 -040060int write_ctree_super(struct btrfs_trans_handle *trans,
Yan Zhenga512bbf2008-12-08 16:46:26 -050061 struct btrfs_root *root, int max_mirrors);
62struct buffer_head *btrfs_read_dev_super(struct block_device *bdev);
Yan Zhengc146afa2008-11-12 14:34:12 -050063int btrfs_commit_super(struct btrfs_root *root);
Chris Mason5f39d392007-10-15 16:14:19 -040064struct extent_buffer *btrfs_find_tree_block(struct btrfs_root *root,
Chris Masondb945352007-10-15 16:15:53 -040065 u64 bytenr, u32 blocksize);
Miao Xiecb517ea2013-05-15 07:48:19 +000066struct btrfs_root *btrfs_read_fs_root(struct btrfs_root *tree_root,
67 struct btrfs_key *location);
68int btrfs_init_fs_root(struct btrfs_root *root);
69int btrfs_insert_fs_root(struct btrfs_fs_info *fs_info,
70 struct btrfs_root *root);
Miao Xiec00869f2013-09-25 21:47:44 +080071
72struct btrfs_root *btrfs_get_fs_root(struct btrfs_fs_info *fs_info,
73 struct btrfs_key *key,
74 bool check_ref);
75static inline struct btrfs_root *
76btrfs_read_fs_root_no_name(struct btrfs_fs_info *fs_info,
77 struct btrfs_key *location)
78{
79 return btrfs_get_fs_root(fs_info, location, true);
80}
81
Yan Zhengc146afa2008-11-12 14:34:12 -050082int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info);
Liu Bob53d3f52012-11-14 14:34:34 +000083void btrfs_btree_balance_dirty(struct btrfs_root *root);
84void btrfs_btree_balance_dirty_nodelay(struct btrfs_root *root);
Miao Xiecb517ea2013-05-15 07:48:19 +000085void btrfs_drop_and_free_fs_root(struct btrfs_fs_info *fs_info,
86 struct btrfs_root *root);
87void btrfs_free_fs_root(struct btrfs_root *root);
Miao Xieb0feb9d2013-05-15 07:48:20 +000088
89/*
90 * This function is used to grab the root, and avoid it is freed when we
91 * access it. But it doesn't ensure that the tree is not dropped.
92 *
93 * If you want to ensure the whole tree is safe, you should use
94 * fs_info->subvol_srcu
95 */
96static inline struct btrfs_root *btrfs_grab_fs_root(struct btrfs_root *root)
97{
98 if (atomic_inc_not_zero(&root->refs))
99 return root;
100 return NULL;
101}
102
103static inline void btrfs_put_fs_root(struct btrfs_root *root)
104{
105 if (atomic_dec_and_test(&root->refs))
106 kfree(root);
107}
108
Chris Mason5f39d392007-10-15 16:14:19 -0400109void btrfs_mark_buffer_dirty(struct extent_buffer *buf);
Chris Masonb9fab912012-05-06 07:23:47 -0400110int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid,
111 int atomic);
Chris Mason5f39d392007-10-15 16:14:19 -0400112int btrfs_set_buffer_uptodate(struct extent_buffer *buf);
Chris Masonca7a79a2008-05-12 12:59:19 -0400113int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid);
Liu Bob0496682013-03-14 14:57:45 +0000114u32 btrfs_csum_data(char *data, u32 seed, size_t len);
Chris Masonff79f812007-10-15 16:22:25 -0400115void btrfs_csum_final(u32 crc, char *result);
Chris Mason22c59942008-04-09 16:28:12 -0400116int btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio,
117 int metadata);
Chris Mason44b8bd72008-04-16 11:14:51 -0400118int btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct inode *inode,
119 int rw, struct bio *bio, int mirror_num,
Chris Masoneaf25d92010-05-25 09:48:28 -0400120 unsigned long bio_flags, u64 bio_offset,
Chris Mason4a69a412008-11-06 22:03:00 -0500121 extent_submit_bio_hook_t *submit_bio_start,
122 extent_submit_bio_hook_t *submit_bio_done);
Chris Masonb64a2852008-08-20 13:39:41 -0400123unsigned long btrfs_async_submit_limit(struct btrfs_fs_info *info);
Chris Masone02119d2008-09-05 16:13:11 -0400124int btrfs_write_tree_block(struct extent_buffer *buf);
125int btrfs_wait_tree_block_writeback(struct extent_buffer *buf);
Chris Masone02119d2008-09-05 16:13:11 -0400126int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans,
127 struct btrfs_fs_info *fs_info);
Yan Zheng7237f182009-01-21 12:54:03 -0500128int btrfs_add_log_tree(struct btrfs_trans_handle *trans,
129 struct btrfs_root *root);
Jeff Mahoney49b25e02012-03-01 17:24:58 +0100130void btrfs_cleanup_one_transaction(struct btrfs_transaction *trans,
131 struct btrfs_root *root);
Arne Jansen20897f52011-09-13 12:44:20 +0200132struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans,
133 struct btrfs_fs_info *fs_info,
134 u64 objectid);
135int btree_lock_page_hook(struct page *page, void *data,
136 void (*flush_fn)(void *));
Stefan Behrens5af3e8c2012-08-01 18:56:49 +0200137int btrfs_calc_num_tolerated_disk_barrier_failures(
138 struct btrfs_fs_info *fs_info);
Chris Mason4008c042009-02-12 14:09:45 -0500139
140#ifdef CONFIG_DEBUG_LOCK_ALLOC
Chris Mason85d4e462011-07-26 16:11:19 -0400141void btrfs_init_lockdep(void);
142void btrfs_set_buffer_lockdep_class(u64 objectid,
143 struct extent_buffer *eb, int level);
Chris Mason4008c042009-02-12 14:09:45 -0500144#else
Chris Mason85d4e462011-07-26 16:11:19 -0400145static inline void btrfs_init_lockdep(void)
146{ }
147static inline void btrfs_set_buffer_lockdep_class(u64 objectid,
148 struct extent_buffer *eb, int level)
Chris Mason4008c042009-02-12 14:09:45 -0500149{
150}
151#endif
Chris Masoneb60cea2007-02-02 09:18:22 -0500152#endif