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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
Byongho Leeee221842015-12-15 01:42:10 +090022#define BTRFS_SUPER_INFO_OFFSET SZ_64K
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 Sterbabfebd8b2014-07-30 00:25:45 +020028enum btrfs_wq_endio_type {
David Woodhouse53b381b2013-01-29 18:40:14 -050029 BTRFS_WQ_ENDIO_DATA = 0,
30 BTRFS_WQ_ENDIO_METADATA = 1,
31 BTRFS_WQ_ENDIO_FREE_SPACE = 2,
32 BTRFS_WQ_ENDIO_RAID56 = 3,
Miao Xie8b110e32014-09-12 18:44:03 +080033 BTRFS_WQ_ENDIO_DIO_REPAIR = 4,
David Woodhouse53b381b2013-01-29 18:40:14 -050034};
35
Yan Zhenga512bbf2008-12-08 16:46:26 -050036static inline u64 btrfs_sb_offset(int mirror)
37{
Byongho Leeee221842015-12-15 01:42:10 +090038 u64 start = SZ_16K;
Yan Zhenga512bbf2008-12-08 16:46:26 -050039 if (mirror)
40 return start << (BTRFS_SUPER_MIRROR_SHIFT * mirror);
41 return BTRFS_SUPER_INFO_OFFSET;
42}
43
Chris Mason0b86a832008-03-24 15:01:56 -040044struct btrfs_device;
Chris Mason8a4b83c2008-03-24 15:02:07 -040045struct btrfs_fs_devices;
Chris Masoneb60cea2007-02-02 09:18:22 -050046
Chris Masondb945352007-10-15 16:15:53 -040047struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr,
David Sterbace86cd52014-06-15 01:07:32 +020048 u64 parent_transid);
David Sterbad3e46fe2014-06-15 02:04:19 +020049void readahead_tree_block(struct btrfs_root *root, u64 bytenr);
David Sterbac0dcaa42014-06-15 02:24:21 +020050int reada_tree_block_flagged(struct btrfs_root *root, u64 bytenr,
Arne Jansenab0fff02011-05-23 14:25:41 +020051 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,
David Sterbaa83fffb2014-06-15 02:39:54 +020053 u64 bytenr);
Jeff Mahoneyd5c13f92012-03-01 14:56:27 +010054void clean_tree_block(struct btrfs_trans_handle *trans,
Daniel Dressler01d58472014-11-21 17:15:07 +090055 struct btrfs_fs_info *fs_info, 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);
David Sterba3abdbd72014-06-04 18:10:45 +020059void 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);
Anand Jain29c36d72015-08-14 18:32:58 +080063int btrfs_read_dev_one_super(struct block_device *bdev, int copy_num,
64 struct buffer_head **bh_ret);
Yan Zhengc146afa2008-11-12 14:34:12 -050065int btrfs_commit_super(struct btrfs_root *root);
Daniel Dressler01d58472014-11-21 17:15:07 +090066struct extent_buffer *btrfs_find_tree_block(struct btrfs_fs_info *fs_info,
David Sterba0308af42014-06-15 01:43:40 +020067 u64 bytenr);
Miao Xiecb517ea2013-05-15 07:48:19 +000068struct btrfs_root *btrfs_read_fs_root(struct btrfs_root *tree_root,
69 struct btrfs_key *location);
70int btrfs_init_fs_root(struct btrfs_root *root);
71int btrfs_insert_fs_root(struct btrfs_fs_info *fs_info,
72 struct btrfs_root *root);
Josef Bacikfaa2dbf2014-05-07 17:06:09 -040073void btrfs_free_fs_roots(struct btrfs_fs_info *fs_info);
Miao Xiec00869f2013-09-25 21:47:44 +080074
75struct btrfs_root *btrfs_get_fs_root(struct btrfs_fs_info *fs_info,
76 struct btrfs_key *key,
77 bool check_ref);
78static inline struct btrfs_root *
79btrfs_read_fs_root_no_name(struct btrfs_fs_info *fs_info,
80 struct btrfs_key *location)
81{
82 return btrfs_get_fs_root(fs_info, location, true);
83}
84
Yan Zhengc146afa2008-11-12 14:34:12 -050085int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info);
Liu Bob53d3f52012-11-14 14:34:34 +000086void btrfs_btree_balance_dirty(struct btrfs_root *root);
87void btrfs_btree_balance_dirty_nodelay(struct btrfs_root *root);
Miao Xiecb517ea2013-05-15 07:48:19 +000088void btrfs_drop_and_free_fs_root(struct btrfs_fs_info *fs_info,
89 struct btrfs_root *root);
90void btrfs_free_fs_root(struct btrfs_root *root);
Miao Xieb0feb9d2013-05-15 07:48:20 +000091
Josef Bacik06ea65a2013-09-19 16:07:01 -040092#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
93struct btrfs_root *btrfs_alloc_dummy_root(void);
94#endif
95
Miao Xieb0feb9d2013-05-15 07:48:20 +000096/*
97 * This function is used to grab the root, and avoid it is freed when we
98 * access it. But it doesn't ensure that the tree is not dropped.
99 *
100 * If you want to ensure the whole tree is safe, you should use
101 * fs_info->subvol_srcu
102 */
103static inline struct btrfs_root *btrfs_grab_fs_root(struct btrfs_root *root)
104{
105 if (atomic_inc_not_zero(&root->refs))
106 return root;
107 return NULL;
108}
109
110static inline void btrfs_put_fs_root(struct btrfs_root *root)
111{
112 if (atomic_dec_and_test(&root->refs))
113 kfree(root);
114}
115
Chris Mason5f39d392007-10-15 16:14:19 -0400116void btrfs_mark_buffer_dirty(struct extent_buffer *buf);
Chris Masonb9fab912012-05-06 07:23:47 -0400117int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid,
118 int atomic);
Chris Masonca7a79a2008-05-12 12:59:19 -0400119int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid);
Liu Bob0496682013-03-14 14:57:45 +0000120u32 btrfs_csum_data(char *data, u32 seed, size_t len);
Chris Masonff79f812007-10-15 16:22:25 -0400121void btrfs_csum_final(u32 crc, char *result);
Chris Mason22c59942008-04-09 16:28:12 -0400122int btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio,
David Sterbabfebd8b2014-07-30 00:25:45 +0200123 enum btrfs_wq_endio_type metadata);
Chris Mason44b8bd72008-04-16 11:14:51 -0400124int btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct inode *inode,
125 int rw, struct bio *bio, int mirror_num,
Chris Masoneaf25d92010-05-25 09:48:28 -0400126 unsigned long bio_flags, u64 bio_offset,
Chris Mason4a69a412008-11-06 22:03:00 -0500127 extent_submit_bio_hook_t *submit_bio_start,
128 extent_submit_bio_hook_t *submit_bio_done);
Chris Masonb64a2852008-08-20 13:39:41 -0400129unsigned long btrfs_async_submit_limit(struct btrfs_fs_info *info);
Chris Masone02119d2008-09-05 16:13:11 -0400130int btrfs_write_tree_block(struct extent_buffer *buf);
131int btrfs_wait_tree_block_writeback(struct extent_buffer *buf);
Chris Masone02119d2008-09-05 16:13:11 -0400132int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans,
133 struct btrfs_fs_info *fs_info);
Yan Zheng7237f182009-01-21 12:54:03 -0500134int btrfs_add_log_tree(struct btrfs_trans_handle *trans,
135 struct btrfs_root *root);
Jeff Mahoney49b25e02012-03-01 17:24:58 +0100136void btrfs_cleanup_one_transaction(struct btrfs_transaction *trans,
137 struct btrfs_root *root);
Arne Jansen20897f52011-09-13 12:44:20 +0200138struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans,
139 struct btrfs_fs_info *fs_info,
140 u64 objectid);
141int btree_lock_page_hook(struct page *page, void *data,
142 void (*flush_fn)(void *));
Zhao Lei943c6e92015-08-19 15:54:15 +0800143int btrfs_get_num_tolerated_disk_barrier_failures(u64 flags);
Stefan Behrens5af3e8c2012-08-01 18:56:49 +0200144int btrfs_calc_num_tolerated_disk_barrier_failures(
145 struct btrfs_fs_info *fs_info);
David Sterba97eb6b62014-07-30 00:55:42 +0200146int __init btrfs_end_io_wq_init(void);
147void btrfs_end_io_wq_exit(void);
Chris Mason4008c042009-02-12 14:09:45 -0500148
149#ifdef CONFIG_DEBUG_LOCK_ALLOC
Chris Mason85d4e462011-07-26 16:11:19 -0400150void btrfs_init_lockdep(void);
151void btrfs_set_buffer_lockdep_class(u64 objectid,
152 struct extent_buffer *eb, int level);
Chris Mason4008c042009-02-12 14:09:45 -0500153#else
Chris Mason85d4e462011-07-26 16:11:19 -0400154static inline void btrfs_init_lockdep(void)
155{ }
156static inline void btrfs_set_buffer_lockdep_class(u64 objectid,
157 struct extent_buffer *eb, int level)
Chris Mason4008c042009-02-12 14:09:45 -0500158{
159}
160#endif
Chris Masoneb60cea2007-02-02 09:18:22 -0500161#endif