fs/btrfs/disk-io.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Copyright (C) 2007 Oracle.  All rights reserved.
   4  */
   5
   6 #ifndef BTRFS_DISK_IO_H
   7 #define BTRFS_DISK_IO_H
   8
   9 #define BTRFS_SUPER_INFO_OFFSET SZ_64K
  10 #define BTRFS_SUPER_INFO_SIZE 4096
  11
  12 #define BTRFS_SUPER_MIRROR_MAX   3
  13 #define BTRFS_SUPER_MIRROR_SHIFT 12
  14
  15 /*
  16  * Fixed blocksize for all devices, applies to specific ways of reading
  17  * metadata like superblock. Must meet the set_blocksize requirements.
  18  *
  19  * Do not change.
  20  */
  21 #define BTRFS_BDEV_BLOCKSIZE    (4096)
  22
  23 enum btrfs_wq_endio_type {
  24         BTRFS_WQ_ENDIO_DATA,
  25         BTRFS_WQ_ENDIO_METADATA,
  26         BTRFS_WQ_ENDIO_FREE_SPACE,
  27         BTRFS_WQ_ENDIO_RAID56,
  28 };
  29
  30 static inline u64 btrfs_sb_offset(int mirror)
  31 {
  32         u64 start = SZ_16K;
  33         if (mirror)
  34                 return start << (BTRFS_SUPER_MIRROR_SHIFT * mirror);
  35         return BTRFS_SUPER_INFO_OFFSET;
  36 }
  37
  38 struct btrfs_device;
  39 struct btrfs_fs_devices;
  40
  41 void btrfs_check_leaked_roots(struct btrfs_fs_info *fs_info);
  42 void btrfs_init_fs_info(struct btrfs_fs_info *fs_info);
  43 int btrfs_verify_level_key(struct extent_buffer *eb, int level,
  44                            struct btrfs_key *first_key, u64 parent_transid);
  45 struct extent_buffer *read_tree_block(struct btrfs_fs_info *fs_info, u64 bytenr,
  46                                       u64 owner_root, u64 parent_transid,
  47                                       int level, struct btrfs_key *first_key);
  48 struct extent_buffer *btrfs_find_create_tree_block(
  49                                                 struct btrfs_fs_info *fs_info,
  50                                                 u64 bytenr, u64 owner_root,
  51                                                 int level);
  52 void btrfs_clean_tree_block(struct extent_buffer *buf);
  53 void btrfs_clear_oneshot_options(struct btrfs_fs_info *fs_info);
  54 int btrfs_start_pre_rw_mount(struct btrfs_fs_info *fs_info);
  55 int __cold open_ctree(struct super_block *sb,
  56                struct btrfs_fs_devices *fs_devices,
  57                char *options);
  58 void __cold close_ctree(struct btrfs_fs_info *fs_info);
  59 int write_all_supers(struct btrfs_fs_info *fs_info, int max_mirrors);
  60 struct btrfs_super_block *btrfs_read_dev_super(struct block_device *bdev);
  61 struct btrfs_super_block *btrfs_read_dev_one_super(struct block_device *bdev,
  62                                                    int copy_num);
  63 int btrfs_commit_super(struct btrfs_fs_info *fs_info);
  64 struct btrfs_root *btrfs_read_tree_root(struct btrfs_root *tree_root,
  65                                         struct btrfs_key *key);
  66 int btrfs_insert_fs_root(struct btrfs_fs_info *fs_info,
  67                          struct btrfs_root *root);
  68 void btrfs_free_fs_roots(struct btrfs_fs_info *fs_info);
  69
  70 struct btrfs_root *btrfs_get_fs_root(struct btrfs_fs_info *fs_info,
  71                                      u64 objectid, bool check_ref);
  72 struct btrfs_root *btrfs_get_new_fs_root(struct btrfs_fs_info *fs_info,
  73                                          u64 objectid, dev_t anon_dev);
  74 struct btrfs_root *btrfs_get_fs_root_commit_root(struct btrfs_fs_info *fs_info,
  75                                                  struct btrfs_path *path,
  76                                                  u64 objectid);
  77
  78 void btrfs_free_fs_info(struct btrfs_fs_info *fs_info);
  79 int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info);
  80 void btrfs_btree_balance_dirty(struct btrfs_fs_info *fs_info);
  81 void btrfs_btree_balance_dirty_nodelay(struct btrfs_fs_info *fs_info);
  82 void btrfs_drop_and_free_fs_root(struct btrfs_fs_info *fs_info,
  83                                  struct btrfs_root *root);
  84 int btrfs_validate_metadata_buffer(struct btrfs_io_bio *io_bio,
  85                                    struct page *page, u64 start, u64 end,
  86                                    int mirror);
  87 blk_status_t btrfs_submit_metadata_bio(struct inode *inode, struct bio *bio,
  88                                        int mirror_num, unsigned long bio_flags);
  89 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
  90 struct btrfs_root *btrfs_alloc_dummy_root(struct btrfs_fs_info *fs_info);
  91 #endif
  92
  93 /*
  94  * This function is used to grab the root, and avoid it is freed when we
  95  * access it. But it doesn't ensure that the tree is not dropped.
  96  *
  97  * If you want to ensure the whole tree is safe, you should use
  98  *      fs_info->subvol_srcu
  99  */
 100 static inline struct btrfs_root *btrfs_grab_root(struct btrfs_root *root)
 101 {
 102         if (!root)
 103                 return NULL;
 104         if (refcount_inc_not_zero(&root->refs))
 105                 return root;
 106         return NULL;
 107 }
 108
 109 void btrfs_put_root(struct btrfs_root *root);
 110 void btrfs_mark_buffer_dirty(struct extent_buffer *buf);
 111 int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid,
 112                           int atomic);
 113 int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid, int level,
 114                       struct btrfs_key *first_key);
 115 blk_status_t btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio,
 116                         enum btrfs_wq_endio_type metadata);
 117 blk_status_t btrfs_wq_submit_bio(struct inode *inode, struct bio *bio,
 118                                  int mirror_num, unsigned long bio_flags,
 119                                  u64 dio_file_offset,
 120                                  extent_submit_bio_start_t *submit_bio_start);
 121 blk_status_t btrfs_submit_bio_done(void *private_data, struct bio *bio,
 122                           int mirror_num);
 123 int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans,
 124                              struct btrfs_fs_info *fs_info);
 125 int btrfs_add_log_tree(struct btrfs_trans_handle *trans,
 126                        struct btrfs_root *root);
 127 void btrfs_cleanup_dirty_bgs(struct btrfs_transaction *trans,
 128                              struct btrfs_fs_info *fs_info);
 129 void btrfs_cleanup_one_transaction(struct btrfs_transaction *trans,
 130                                   struct btrfs_fs_info *fs_info);
 131 struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans,
 132                                      u64 objectid);
 133 int btree_lock_page_hook(struct page *page, void *data,
 134                                 void (*flush_fn)(void *));
 135 int btrfs_get_num_tolerated_disk_barrier_failures(u64 flags);
 136 int btrfs_find_free_objectid(struct btrfs_root *root, u64 *objectid);
 137 int btrfs_find_highest_objectid(struct btrfs_root *root, u64 *objectid);
 138 int __init btrfs_end_io_wq_init(void);
 139 void __cold btrfs_end_io_wq_exit(void);
 140
 141 #ifdef CONFIG_DEBUG_LOCK_ALLOC
 142 void btrfs_set_buffer_lockdep_class(u64 objectid,
 143                                     struct extent_buffer *eb, int level);
 144 #else
 145 static inline void btrfs_set_buffer_lockdep_class(u64 objectid,
 146                                         struct extent_buffer *eb, int level)
 147 {
 148 }
 149 #endif
 150
 151 #endif