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