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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 Sterba9f6d2512017-06-16 01:48:05 +020028/*
29 * Fixed blocksize for all devices, applies to specific ways of reading
30 * metadata like superblock. Must meet the set_blocksize requirements.
31 *
32 * Do not change.
33 */
34#define BTRFS_BDEV_BLOCKSIZE (4096)
35
David Sterbabfebd8b2014-07-30 00:25:45 +020036enum btrfs_wq_endio_type {
David Woodhouse53b381b2013-01-29 18:40:14 -050037 BTRFS_WQ_ENDIO_DATA = 0,
38 BTRFS_WQ_ENDIO_METADATA = 1,
39 BTRFS_WQ_ENDIO_FREE_SPACE = 2,
40 BTRFS_WQ_ENDIO_RAID56 = 3,
Miao Xie8b110e32014-09-12 18:44:03 +080041 BTRFS_WQ_ENDIO_DIO_REPAIR = 4,
David Woodhouse53b381b2013-01-29 18:40:14 -050042};
43
Yan Zhenga512bbf2008-12-08 16:46:26 -050044static inline u64 btrfs_sb_offset(int mirror)
45{
Byongho Leeee221842015-12-15 01:42:10 +090046 u64 start = SZ_16K;
Yan Zhenga512bbf2008-12-08 16:46:26 -050047 if (mirror)
48 return start << (BTRFS_SUPER_MIRROR_SHIFT * mirror);
49 return BTRFS_SUPER_INFO_OFFSET;
50}
51
Chris Mason0b86a832008-03-24 15:01:56 -040052struct btrfs_device;
Chris Mason8a4b83c2008-03-24 15:02:07 -040053struct btrfs_fs_devices;
Chris Masoneb60cea2007-02-02 09:18:22 -050054
Jeff Mahoney2ff7e612016-06-22 18:54:24 -040055struct extent_buffer *read_tree_block(struct btrfs_fs_info *fs_info,
56 u64 bytenr, u64 parent_transid);
57void readahead_tree_block(struct btrfs_fs_info *fs_info, u64 bytenr);
58int reada_tree_block_flagged(struct btrfs_fs_info *fs_info, u64 bytenr,
Arne Jansenab0fff02011-05-23 14:25:41 +020059 int mirror_num, struct extent_buffer **eb);
Jeff Mahoney2ff7e612016-06-22 18:54:24 -040060struct extent_buffer *btrfs_find_create_tree_block(
61 struct btrfs_fs_info *fs_info,
62 u64 bytenr);
David Sterba7c302b42017-02-10 18:47:57 +010063void clean_tree_block(struct btrfs_fs_info *fs_info, struct extent_buffer *buf);
Al Viroad2b2c82011-11-17 01:10:02 -050064int open_ctree(struct super_block *sb,
65 struct btrfs_fs_devices *fs_devices,
66 char *options);
Jeff Mahoney6bccf3a2016-06-21 21:16:51 -040067void close_ctree(struct btrfs_fs_info *fs_info);
David Sterbaeece6a92017-02-10 19:04:32 +010068int write_all_supers(struct btrfs_fs_info *fs_info, int max_mirrors);
Yan Zhenga512bbf2008-12-08 16:46:26 -050069struct buffer_head *btrfs_read_dev_super(struct block_device *bdev);
Anand Jain29c36d72015-08-14 18:32:58 +080070int btrfs_read_dev_one_super(struct block_device *bdev, int copy_num,
71 struct buffer_head **bh_ret);
Jeff Mahoney6bccf3a2016-06-21 21:16:51 -040072int btrfs_commit_super(struct btrfs_fs_info *fs_info);
Miao Xiecb517ea2013-05-15 07:48:19 +000073struct btrfs_root *btrfs_read_fs_root(struct btrfs_root *tree_root,
74 struct btrfs_key *location);
75int btrfs_init_fs_root(struct btrfs_root *root);
Jeff Mahoney35bbb972016-08-17 21:58:33 -040076struct btrfs_root *btrfs_lookup_fs_root(struct btrfs_fs_info *fs_info,
77 u64 root_id);
Miao Xiecb517ea2013-05-15 07:48:19 +000078int btrfs_insert_fs_root(struct btrfs_fs_info *fs_info,
79 struct btrfs_root *root);
Josef Bacikfaa2dbf2014-05-07 17:06:09 -040080void btrfs_free_fs_roots(struct btrfs_fs_info *fs_info);
Miao Xiec00869f2013-09-25 21:47:44 +080081
82struct btrfs_root *btrfs_get_fs_root(struct btrfs_fs_info *fs_info,
83 struct btrfs_key *key,
84 bool check_ref);
85static inline struct btrfs_root *
86btrfs_read_fs_root_no_name(struct btrfs_fs_info *fs_info,
87 struct btrfs_key *location)
88{
89 return btrfs_get_fs_root(fs_info, location, true);
90}
91
Yan Zhengc146afa2008-11-12 14:34:12 -050092int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info);
Jeff Mahoney2ff7e612016-06-22 18:54:24 -040093void btrfs_btree_balance_dirty(struct btrfs_fs_info *fs_info);
94void btrfs_btree_balance_dirty_nodelay(struct btrfs_fs_info *fs_info);
Miao Xiecb517ea2013-05-15 07:48:19 +000095void btrfs_drop_and_free_fs_root(struct btrfs_fs_info *fs_info,
96 struct btrfs_root *root);
97void btrfs_free_fs_root(struct btrfs_root *root);
Miao Xieb0feb9d2013-05-15 07:48:20 +000098
Josef Bacik06ea65a2013-09-19 16:07:01 -040099#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
Jeff Mahoneyda170662016-06-15 09:22:56 -0400100struct btrfs_root *btrfs_alloc_dummy_root(struct btrfs_fs_info *fs_info);
Josef Bacik06ea65a2013-09-19 16:07:01 -0400101#endif
102
Miao Xieb0feb9d2013-05-15 07:48:20 +0000103/*
104 * This function is used to grab the root, and avoid it is freed when we
105 * access it. But it doesn't ensure that the tree is not dropped.
106 *
107 * If you want to ensure the whole tree is safe, you should use
108 * fs_info->subvol_srcu
109 */
110static inline struct btrfs_root *btrfs_grab_fs_root(struct btrfs_root *root)
111{
Elena Reshetova0700cea2017-03-03 10:55:18 +0200112 if (refcount_inc_not_zero(&root->refs))
Miao Xieb0feb9d2013-05-15 07:48:20 +0000113 return root;
114 return NULL;
115}
116
117static inline void btrfs_put_fs_root(struct btrfs_root *root)
118{
Elena Reshetova0700cea2017-03-03 10:55:18 +0200119 if (refcount_dec_and_test(&root->refs))
Miao Xieb0feb9d2013-05-15 07:48:20 +0000120 kfree(root);
121}
122
Chris Mason5f39d392007-10-15 16:14:19 -0400123void btrfs_mark_buffer_dirty(struct extent_buffer *buf);
Chris Masonb9fab912012-05-06 07:23:47 -0400124int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid,
125 int atomic);
Chris Masonca7a79a2008-05-12 12:59:19 -0400126int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid);
David Sterba9ed57362017-02-14 18:03:49 +0100127u32 btrfs_csum_data(const char *data, u32 seed, size_t len);
Domagoj Tršan0b5e3da2016-10-27 08:52:33 +0100128void btrfs_csum_final(u32 crc, u8 *result);
Christoph Hellwig4e4cbee2017-06-03 09:38:06 +0200129blk_status_t btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio,
David Sterbabfebd8b2014-07-30 00:25:45 +0200130 enum btrfs_wq_endio_type metadata);
Linus Torvalds8c27cb32017-07-05 16:41:23 -0700131blk_status_t btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct bio *bio,
Josef Bacikc6100a42017-05-05 11:57:13 -0400132 int mirror_num, unsigned long bio_flags,
133 u64 bio_offset, void *private_data,
Chris Mason4a69a412008-11-06 22:03:00 -0500134 extent_submit_bio_hook_t *submit_bio_start,
135 extent_submit_bio_hook_t *submit_bio_done);
Chris Masonb64a2852008-08-20 13:39:41 -0400136unsigned long btrfs_async_submit_limit(struct btrfs_fs_info *info);
Chris Masone02119d2008-09-05 16:13:11 -0400137int btrfs_write_tree_block(struct extent_buffer *buf);
Jeff Layton3189ff72017-05-25 06:39:52 -0400138void btrfs_wait_tree_block_writeback(struct extent_buffer *buf);
Chris Masone02119d2008-09-05 16:13:11 -0400139int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans,
140 struct btrfs_fs_info *fs_info);
Yan Zheng7237f182009-01-21 12:54:03 -0500141int btrfs_add_log_tree(struct btrfs_trans_handle *trans,
142 struct btrfs_root *root);
Liu Boc79a1752016-07-20 17:44:12 -0700143void btrfs_cleanup_dirty_bgs(struct btrfs_transaction *trans,
Jeff Mahoney2ff7e612016-06-22 18:54:24 -0400144 struct btrfs_fs_info *fs_info);
Jeff Mahoney49b25e02012-03-01 17:24:58 +0100145void btrfs_cleanup_one_transaction(struct btrfs_transaction *trans,
Jeff Mahoney2ff7e612016-06-22 18:54:24 -0400146 struct btrfs_fs_info *fs_info);
Arne Jansen20897f52011-09-13 12:44:20 +0200147struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans,
148 struct btrfs_fs_info *fs_info,
149 u64 objectid);
150int btree_lock_page_hook(struct page *page, void *data,
151 void (*flush_fn)(void *));
Zhao Lei943c6e92015-08-19 15:54:15 +0800152int btrfs_get_num_tolerated_disk_barrier_failures(u64 flags);
David Sterba97eb6b62014-07-30 00:55:42 +0200153int __init btrfs_end_io_wq_init(void);
154void btrfs_end_io_wq_exit(void);
Chris Mason4008c042009-02-12 14:09:45 -0500155
156#ifdef CONFIG_DEBUG_LOCK_ALLOC
Chris Mason85d4e462011-07-26 16:11:19 -0400157void btrfs_init_lockdep(void);
158void btrfs_set_buffer_lockdep_class(u64 objectid,
159 struct extent_buffer *eb, int level);
Chris Mason4008c042009-02-12 14:09:45 -0500160#else
Chris Mason85d4e462011-07-26 16:11:19 -0400161static inline void btrfs_init_lockdep(void)
162{ }
163static inline void btrfs_set_buffer_lockdep_class(u64 objectid,
164 struct extent_buffer *eb, int level)
Chris Mason4008c042009-02-12 14:09:45 -0500165{
166}
167#endif
Chris Masoneb60cea2007-02-02 09:18:22 -0500168#endif