Chris Mason | 6cbd557 | 2007-06-12 09:07:21 -0400 | [diff] [blame] | 1 | /* |
| 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 Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 19 | #ifndef __DISKIO__ |
| 20 | #define __DISKIO__ |
| 21 | |
Byongho Lee | ee22184 | 2015-12-15 01:42:10 +0900 | [diff] [blame] | 22 | #define BTRFS_SUPER_INFO_OFFSET SZ_64K |
Chris Mason | f298446 | 2008-04-10 16:19:33 -0400 | [diff] [blame] | 23 | #define BTRFS_SUPER_INFO_SIZE 4096 |
Yan Zheng | a512bbf | 2008-12-08 16:46:26 -0500 | [diff] [blame] | 24 | |
| 25 | #define BTRFS_SUPER_MIRROR_MAX 3 |
| 26 | #define BTRFS_SUPER_MIRROR_SHIFT 12 |
| 27 | |
David Sterba | 9f6d251 | 2017-06-16 01:48:05 +0200 | [diff] [blame] | 28 | /* |
| 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 Sterba | bfebd8b | 2014-07-30 00:25:45 +0200 | [diff] [blame] | 36 | enum btrfs_wq_endio_type { |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 37 | 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 Xie | 8b110e3 | 2014-09-12 18:44:03 +0800 | [diff] [blame] | 41 | BTRFS_WQ_ENDIO_DIO_REPAIR = 4, |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 42 | }; |
| 43 | |
Yan Zheng | a512bbf | 2008-12-08 16:46:26 -0500 | [diff] [blame] | 44 | static inline u64 btrfs_sb_offset(int mirror) |
| 45 | { |
Byongho Lee | ee22184 | 2015-12-15 01:42:10 +0900 | [diff] [blame] | 46 | u64 start = SZ_16K; |
Yan Zheng | a512bbf | 2008-12-08 16:46:26 -0500 | [diff] [blame] | 47 | if (mirror) |
| 48 | return start << (BTRFS_SUPER_MIRROR_SHIFT * mirror); |
| 49 | return BTRFS_SUPER_INFO_OFFSET; |
| 50 | } |
| 51 | |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 52 | struct btrfs_device; |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 53 | struct btrfs_fs_devices; |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 54 | |
Jeff Mahoney | 2ff7e61 | 2016-06-22 18:54:24 -0400 | [diff] [blame] | 55 | struct extent_buffer *read_tree_block(struct btrfs_fs_info *fs_info, |
| 56 | u64 bytenr, u64 parent_transid); |
| 57 | void readahead_tree_block(struct btrfs_fs_info *fs_info, u64 bytenr); |
| 58 | int reada_tree_block_flagged(struct btrfs_fs_info *fs_info, u64 bytenr, |
Arne Jansen | ab0fff0 | 2011-05-23 14:25:41 +0200 | [diff] [blame] | 59 | int mirror_num, struct extent_buffer **eb); |
Jeff Mahoney | 2ff7e61 | 2016-06-22 18:54:24 -0400 | [diff] [blame] | 60 | struct extent_buffer *btrfs_find_create_tree_block( |
| 61 | struct btrfs_fs_info *fs_info, |
| 62 | u64 bytenr); |
David Sterba | 7c302b4 | 2017-02-10 18:47:57 +0100 | [diff] [blame] | 63 | void clean_tree_block(struct btrfs_fs_info *fs_info, struct extent_buffer *buf); |
Al Viro | ad2b2c8 | 2011-11-17 01:10:02 -0500 | [diff] [blame] | 64 | int open_ctree(struct super_block *sb, |
| 65 | struct btrfs_fs_devices *fs_devices, |
| 66 | char *options); |
Jeff Mahoney | 6bccf3a | 2016-06-21 21:16:51 -0400 | [diff] [blame] | 67 | void close_ctree(struct btrfs_fs_info *fs_info); |
David Sterba | eece6a9 | 2017-02-10 19:04:32 +0100 | [diff] [blame] | 68 | int write_all_supers(struct btrfs_fs_info *fs_info, int max_mirrors); |
Yan Zheng | a512bbf | 2008-12-08 16:46:26 -0500 | [diff] [blame] | 69 | struct buffer_head *btrfs_read_dev_super(struct block_device *bdev); |
Anand Jain | 29c36d7 | 2015-08-14 18:32:58 +0800 | [diff] [blame] | 70 | int btrfs_read_dev_one_super(struct block_device *bdev, int copy_num, |
| 71 | struct buffer_head **bh_ret); |
Jeff Mahoney | 6bccf3a | 2016-06-21 21:16:51 -0400 | [diff] [blame] | 72 | int btrfs_commit_super(struct btrfs_fs_info *fs_info); |
Miao Xie | cb517ea | 2013-05-15 07:48:19 +0000 | [diff] [blame] | 73 | struct btrfs_root *btrfs_read_fs_root(struct btrfs_root *tree_root, |
| 74 | struct btrfs_key *location); |
| 75 | int btrfs_init_fs_root(struct btrfs_root *root); |
Jeff Mahoney | 35bbb97 | 2016-08-17 21:58:33 -0400 | [diff] [blame] | 76 | struct btrfs_root *btrfs_lookup_fs_root(struct btrfs_fs_info *fs_info, |
| 77 | u64 root_id); |
Miao Xie | cb517ea | 2013-05-15 07:48:19 +0000 | [diff] [blame] | 78 | int btrfs_insert_fs_root(struct btrfs_fs_info *fs_info, |
| 79 | struct btrfs_root *root); |
Josef Bacik | faa2dbf | 2014-05-07 17:06:09 -0400 | [diff] [blame] | 80 | void btrfs_free_fs_roots(struct btrfs_fs_info *fs_info); |
Miao Xie | c00869f | 2013-09-25 21:47:44 +0800 | [diff] [blame] | 81 | |
| 82 | struct btrfs_root *btrfs_get_fs_root(struct btrfs_fs_info *fs_info, |
| 83 | struct btrfs_key *key, |
| 84 | bool check_ref); |
| 85 | static inline struct btrfs_root * |
| 86 | btrfs_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 Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 92 | int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info); |
Jeff Mahoney | 2ff7e61 | 2016-06-22 18:54:24 -0400 | [diff] [blame] | 93 | void btrfs_btree_balance_dirty(struct btrfs_fs_info *fs_info); |
| 94 | void btrfs_btree_balance_dirty_nodelay(struct btrfs_fs_info *fs_info); |
Miao Xie | cb517ea | 2013-05-15 07:48:19 +0000 | [diff] [blame] | 95 | void btrfs_drop_and_free_fs_root(struct btrfs_fs_info *fs_info, |
| 96 | struct btrfs_root *root); |
| 97 | void btrfs_free_fs_root(struct btrfs_root *root); |
Miao Xie | b0feb9d | 2013-05-15 07:48:20 +0000 | [diff] [blame] | 98 | |
Josef Bacik | 06ea65a | 2013-09-19 16:07:01 -0400 | [diff] [blame] | 99 | #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS |
Jeff Mahoney | da17066 | 2016-06-15 09:22:56 -0400 | [diff] [blame] | 100 | struct btrfs_root *btrfs_alloc_dummy_root(struct btrfs_fs_info *fs_info); |
Josef Bacik | 06ea65a | 2013-09-19 16:07:01 -0400 | [diff] [blame] | 101 | #endif |
| 102 | |
Miao Xie | b0feb9d | 2013-05-15 07:48:20 +0000 | [diff] [blame] | 103 | /* |
| 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 | */ |
| 110 | static inline struct btrfs_root *btrfs_grab_fs_root(struct btrfs_root *root) |
| 111 | { |
Elena Reshetova | 0700cea | 2017-03-03 10:55:18 +0200 | [diff] [blame] | 112 | if (refcount_inc_not_zero(&root->refs)) |
Miao Xie | b0feb9d | 2013-05-15 07:48:20 +0000 | [diff] [blame] | 113 | return root; |
| 114 | return NULL; |
| 115 | } |
| 116 | |
| 117 | static inline void btrfs_put_fs_root(struct btrfs_root *root) |
| 118 | { |
Elena Reshetova | 0700cea | 2017-03-03 10:55:18 +0200 | [diff] [blame] | 119 | if (refcount_dec_and_test(&root->refs)) |
Miao Xie | b0feb9d | 2013-05-15 07:48:20 +0000 | [diff] [blame] | 120 | kfree(root); |
| 121 | } |
| 122 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 123 | void btrfs_mark_buffer_dirty(struct extent_buffer *buf); |
Chris Mason | b9fab91 | 2012-05-06 07:23:47 -0400 | [diff] [blame] | 124 | int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid, |
| 125 | int atomic); |
Chris Mason | ca7a79a | 2008-05-12 12:59:19 -0400 | [diff] [blame] | 126 | int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid); |
David Sterba | 9ed5736 | 2017-02-14 18:03:49 +0100 | [diff] [blame] | 127 | u32 btrfs_csum_data(const char *data, u32 seed, size_t len); |
Domagoj Tršan | 0b5e3da | 2016-10-27 08:52:33 +0100 | [diff] [blame] | 128 | void btrfs_csum_final(u32 crc, u8 *result); |
Christoph Hellwig | 4e4cbee | 2017-06-03 09:38:06 +0200 | [diff] [blame] | 129 | blk_status_t btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio, |
David Sterba | bfebd8b | 2014-07-30 00:25:45 +0200 | [diff] [blame] | 130 | enum btrfs_wq_endio_type metadata); |
Linus Torvalds | 8c27cb3 | 2017-07-05 16:41:23 -0700 | [diff] [blame] | 131 | blk_status_t btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct bio *bio, |
Josef Bacik | c6100a4 | 2017-05-05 11:57:13 -0400 | [diff] [blame] | 132 | int mirror_num, unsigned long bio_flags, |
| 133 | u64 bio_offset, void *private_data, |
Chris Mason | 4a69a41 | 2008-11-06 22:03:00 -0500 | [diff] [blame] | 134 | extent_submit_bio_hook_t *submit_bio_start, |
| 135 | extent_submit_bio_hook_t *submit_bio_done); |
Chris Mason | b64a285 | 2008-08-20 13:39:41 -0400 | [diff] [blame] | 136 | unsigned long btrfs_async_submit_limit(struct btrfs_fs_info *info); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 137 | int btrfs_write_tree_block(struct extent_buffer *buf); |
Jeff Layton | 3189ff7 | 2017-05-25 06:39:52 -0400 | [diff] [blame] | 138 | void btrfs_wait_tree_block_writeback(struct extent_buffer *buf); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 139 | int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans, |
| 140 | struct btrfs_fs_info *fs_info); |
Yan Zheng | 7237f18 | 2009-01-21 12:54:03 -0500 | [diff] [blame] | 141 | int btrfs_add_log_tree(struct btrfs_trans_handle *trans, |
| 142 | struct btrfs_root *root); |
Liu Bo | c79a175 | 2016-07-20 17:44:12 -0700 | [diff] [blame] | 143 | void btrfs_cleanup_dirty_bgs(struct btrfs_transaction *trans, |
Jeff Mahoney | 2ff7e61 | 2016-06-22 18:54:24 -0400 | [diff] [blame] | 144 | struct btrfs_fs_info *fs_info); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 145 | void btrfs_cleanup_one_transaction(struct btrfs_transaction *trans, |
Jeff Mahoney | 2ff7e61 | 2016-06-22 18:54:24 -0400 | [diff] [blame] | 146 | struct btrfs_fs_info *fs_info); |
Arne Jansen | 20897f5 | 2011-09-13 12:44:20 +0200 | [diff] [blame] | 147 | struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans, |
| 148 | struct btrfs_fs_info *fs_info, |
| 149 | u64 objectid); |
| 150 | int btree_lock_page_hook(struct page *page, void *data, |
| 151 | void (*flush_fn)(void *)); |
Zhao Lei | 943c6e9 | 2015-08-19 15:54:15 +0800 | [diff] [blame] | 152 | int btrfs_get_num_tolerated_disk_barrier_failures(u64 flags); |
David Sterba | 97eb6b6 | 2014-07-30 00:55:42 +0200 | [diff] [blame] | 153 | int __init btrfs_end_io_wq_init(void); |
| 154 | void btrfs_end_io_wq_exit(void); |
Chris Mason | 4008c04 | 2009-02-12 14:09:45 -0500 | [diff] [blame] | 155 | |
| 156 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
Chris Mason | 85d4e46 | 2011-07-26 16:11:19 -0400 | [diff] [blame] | 157 | void btrfs_init_lockdep(void); |
| 158 | void btrfs_set_buffer_lockdep_class(u64 objectid, |
| 159 | struct extent_buffer *eb, int level); |
Chris Mason | 4008c04 | 2009-02-12 14:09:45 -0500 | [diff] [blame] | 160 | #else |
Chris Mason | 85d4e46 | 2011-07-26 16:11:19 -0400 | [diff] [blame] | 161 | static inline void btrfs_init_lockdep(void) |
| 162 | { } |
| 163 | static inline void btrfs_set_buffer_lockdep_class(u64 objectid, |
| 164 | struct extent_buffer *eb, int level) |
Chris Mason | 4008c04 | 2009-02-12 14:09:45 -0500 | [diff] [blame] | 165 | { |
| 166 | } |
| 167 | #endif |
Chris Mason | eb60cea | 2007-02-02 09:18:22 -0500 | [diff] [blame] | 168 | #endif |