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0001 /* SPDX-License-Identifier: GPL-2.0 */
0002 /*
0003  * Copyright (C) 2007 Oracle.  All rights reserved.
0004  */
0005 
0006 #ifndef BTRFS_DISK_IO_H
0007 #define BTRFS_DISK_IO_H
0008 
0009 #define BTRFS_SUPER_MIRROR_MAX   3
0010 #define BTRFS_SUPER_MIRROR_SHIFT 12
0011 
0012 /*
0013  * Fixed blocksize for all devices, applies to specific ways of reading
0014  * metadata like superblock. Must meet the set_blocksize requirements.
0015  *
0016  * Do not change.
0017  */
0018 #define BTRFS_BDEV_BLOCKSIZE    (4096)
0019 
0020 static inline u64 btrfs_sb_offset(int mirror)
0021 {
0022     u64 start = SZ_16K;
0023     if (mirror)
0024         return start << (BTRFS_SUPER_MIRROR_SHIFT * mirror);
0025     return BTRFS_SUPER_INFO_OFFSET;
0026 }
0027 
0028 struct btrfs_device;
0029 struct btrfs_fs_devices;
0030 
0031 void btrfs_check_leaked_roots(struct btrfs_fs_info *fs_info);
0032 void btrfs_init_fs_info(struct btrfs_fs_info *fs_info);
0033 int btrfs_verify_level_key(struct extent_buffer *eb, int level,
0034                struct btrfs_key *first_key, u64 parent_transid);
0035 struct extent_buffer *read_tree_block(struct btrfs_fs_info *fs_info, u64 bytenr,
0036                       u64 owner_root, u64 parent_transid,
0037                       int level, struct btrfs_key *first_key);
0038 struct extent_buffer *btrfs_find_create_tree_block(
0039                         struct btrfs_fs_info *fs_info,
0040                         u64 bytenr, u64 owner_root,
0041                         int level);
0042 void btrfs_clean_tree_block(struct extent_buffer *buf);
0043 void btrfs_clear_oneshot_options(struct btrfs_fs_info *fs_info);
0044 int btrfs_start_pre_rw_mount(struct btrfs_fs_info *fs_info);
0045 int __cold open_ctree(struct super_block *sb,
0046            struct btrfs_fs_devices *fs_devices,
0047            char *options);
0048 void __cold close_ctree(struct btrfs_fs_info *fs_info);
0049 int write_all_supers(struct btrfs_fs_info *fs_info, int max_mirrors);
0050 struct btrfs_super_block *btrfs_read_dev_super(struct block_device *bdev);
0051 struct btrfs_super_block *btrfs_read_dev_one_super(struct block_device *bdev,
0052                            int copy_num);
0053 int btrfs_commit_super(struct btrfs_fs_info *fs_info);
0054 struct btrfs_root *btrfs_read_tree_root(struct btrfs_root *tree_root,
0055                     struct btrfs_key *key);
0056 int btrfs_insert_fs_root(struct btrfs_fs_info *fs_info,
0057              struct btrfs_root *root);
0058 void btrfs_free_fs_roots(struct btrfs_fs_info *fs_info);
0059 
0060 struct btrfs_root *btrfs_get_fs_root(struct btrfs_fs_info *fs_info,
0061                      u64 objectid, bool check_ref);
0062 struct btrfs_root *btrfs_get_new_fs_root(struct btrfs_fs_info *fs_info,
0063                      u64 objectid, dev_t anon_dev);
0064 struct btrfs_root *btrfs_get_fs_root_commit_root(struct btrfs_fs_info *fs_info,
0065                          struct btrfs_path *path,
0066                          u64 objectid);
0067 int btrfs_global_root_insert(struct btrfs_root *root);
0068 void btrfs_global_root_delete(struct btrfs_root *root);
0069 struct btrfs_root *btrfs_global_root(struct btrfs_fs_info *fs_info,
0070                      struct btrfs_key *key);
0071 struct btrfs_root *btrfs_csum_root(struct btrfs_fs_info *fs_info, u64 bytenr);
0072 struct btrfs_root *btrfs_extent_root(struct btrfs_fs_info *fs_info, u64 bytenr);
0073 
0074 void btrfs_free_fs_info(struct btrfs_fs_info *fs_info);
0075 int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info);
0076 void btrfs_btree_balance_dirty(struct btrfs_fs_info *fs_info);
0077 void btrfs_btree_balance_dirty_nodelay(struct btrfs_fs_info *fs_info);
0078 void btrfs_drop_and_free_fs_root(struct btrfs_fs_info *fs_info,
0079                  struct btrfs_root *root);
0080 int btrfs_validate_metadata_buffer(struct btrfs_bio *bbio,
0081                    struct page *page, u64 start, u64 end,
0082                    int mirror);
0083 void btrfs_submit_metadata_bio(struct inode *inode, struct bio *bio, int mirror_num);
0084 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
0085 struct btrfs_root *btrfs_alloc_dummy_root(struct btrfs_fs_info *fs_info);
0086 #endif
0087 
0088 /*
0089  * This function is used to grab the root, and avoid it is freed when we
0090  * access it. But it doesn't ensure that the tree is not dropped.
0091  *
0092  * If you want to ensure the whole tree is safe, you should use
0093  *  fs_info->subvol_srcu
0094  */
0095 static inline struct btrfs_root *btrfs_grab_root(struct btrfs_root *root)
0096 {
0097     if (!root)
0098         return NULL;
0099     if (refcount_inc_not_zero(&root->refs))
0100         return root;
0101     return NULL;
0102 }
0103 
0104 static inline struct btrfs_root *btrfs_block_group_root(struct btrfs_fs_info *fs_info)
0105 {
0106     if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2))
0107         return fs_info->block_group_root;
0108     return btrfs_extent_root(fs_info, 0);
0109 }
0110 
0111 void btrfs_put_root(struct btrfs_root *root);
0112 void btrfs_mark_buffer_dirty(struct extent_buffer *buf);
0113 int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid,
0114               int atomic);
0115 int btrfs_read_extent_buffer(struct extent_buffer *buf, u64 parent_transid,
0116                  int level, struct btrfs_key *first_key);
0117 bool btrfs_wq_submit_bio(struct inode *inode, struct bio *bio, int mirror_num,
0118              u64 dio_file_offset,
0119              extent_submit_bio_start_t *submit_bio_start);
0120 blk_status_t btrfs_submit_bio_done(void *private_data, struct bio *bio,
0121               int mirror_num);
0122 int btrfs_alloc_log_tree_node(struct btrfs_trans_handle *trans,
0123                   struct btrfs_root *root);
0124 int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans,
0125                  struct btrfs_fs_info *fs_info);
0126 int btrfs_add_log_tree(struct btrfs_trans_handle *trans,
0127                struct btrfs_root *root);
0128 void btrfs_cleanup_dirty_bgs(struct btrfs_transaction *trans,
0129                  struct btrfs_fs_info *fs_info);
0130 void btrfs_cleanup_one_transaction(struct btrfs_transaction *trans,
0131                   struct btrfs_fs_info *fs_info);
0132 struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans,
0133                      u64 objectid);
0134 int btree_lock_page_hook(struct page *page, void *data,
0135                 void (*flush_fn)(void *));
0136 int btrfs_get_num_tolerated_disk_barrier_failures(u64 flags);
0137 int btrfs_get_free_objectid(struct btrfs_root *root, u64 *objectid);
0138 int btrfs_init_root_free_objectid(struct btrfs_root *root);
0139 
0140 #endif