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-rw-r--r--fs/btrfs/disk-io.h152
1 files changed, 152 insertions, 0 deletions
diff --git a/fs/btrfs/disk-io.h b/fs/btrfs/disk-io.h
new file mode 100644
index 000000000..e3b96944c
--- /dev/null
+++ b/fs/btrfs/disk-io.h
@@ -0,0 +1,152 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2007 Oracle. All rights reserved.
+ */
+
+#ifndef BTRFS_DISK_IO_H
+#define BTRFS_DISK_IO_H
+
+#define BTRFS_SUPER_INFO_OFFSET SZ_64K
+#define BTRFS_SUPER_INFO_SIZE 4096
+
+#define BTRFS_SUPER_MIRROR_MAX 3
+#define BTRFS_SUPER_MIRROR_SHIFT 12
+
+/*
+ * Fixed blocksize for all devices, applies to specific ways of reading
+ * metadata like superblock. Must meet the set_blocksize requirements.
+ *
+ * Do not change.
+ */
+#define BTRFS_BDEV_BLOCKSIZE (4096)
+
+enum btrfs_wq_endio_type {
+ BTRFS_WQ_ENDIO_DATA,
+ BTRFS_WQ_ENDIO_METADATA,
+ BTRFS_WQ_ENDIO_FREE_SPACE,
+ BTRFS_WQ_ENDIO_RAID56,
+};
+
+static inline u64 btrfs_sb_offset(int mirror)
+{
+ u64 start = SZ_16K;
+ if (mirror)
+ return start << (BTRFS_SUPER_MIRROR_SHIFT * mirror);
+ return BTRFS_SUPER_INFO_OFFSET;
+}
+
+struct btrfs_device;
+struct btrfs_fs_devices;
+
+void btrfs_check_leaked_roots(struct btrfs_fs_info *fs_info);
+void btrfs_init_fs_info(struct btrfs_fs_info *fs_info);
+int btrfs_verify_level_key(struct extent_buffer *eb, int level,
+ struct btrfs_key *first_key, u64 parent_transid);
+struct extent_buffer *read_tree_block(struct btrfs_fs_info *fs_info, u64 bytenr,
+ u64 parent_transid, int level,
+ struct btrfs_key *first_key);
+void readahead_tree_block(struct btrfs_fs_info *fs_info, u64 bytenr);
+struct extent_buffer *btrfs_find_create_tree_block(
+ struct btrfs_fs_info *fs_info,
+ u64 bytenr);
+void btrfs_clean_tree_block(struct extent_buffer *buf);
+int __cold open_ctree(struct super_block *sb,
+ struct btrfs_fs_devices *fs_devices,
+ char *options);
+void __cold close_ctree(struct btrfs_fs_info *fs_info);
+int write_all_supers(struct btrfs_fs_info *fs_info, int max_mirrors);
+struct btrfs_super_block *btrfs_read_dev_super(struct block_device *bdev);
+struct btrfs_super_block *btrfs_read_dev_one_super(struct block_device *bdev,
+ int copy_num);
+int btrfs_commit_super(struct btrfs_fs_info *fs_info);
+struct btrfs_root *btrfs_read_tree_root(struct btrfs_root *tree_root,
+ struct btrfs_key *key);
+int btrfs_insert_fs_root(struct btrfs_fs_info *fs_info,
+ struct btrfs_root *root);
+void btrfs_free_fs_roots(struct btrfs_fs_info *fs_info);
+
+struct btrfs_root *btrfs_get_fs_root(struct btrfs_fs_info *fs_info,
+ u64 objectid, bool check_ref);
+struct btrfs_root *btrfs_get_new_fs_root(struct btrfs_fs_info *fs_info,
+ u64 objectid, dev_t anon_dev);
+struct btrfs_root *btrfs_get_fs_root_commit_root(struct btrfs_fs_info *fs_info,
+ struct btrfs_path *path,
+ u64 objectid);
+
+void btrfs_free_fs_info(struct btrfs_fs_info *fs_info);
+int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info);
+void btrfs_btree_balance_dirty(struct btrfs_fs_info *fs_info);
+void btrfs_btree_balance_dirty_nodelay(struct btrfs_fs_info *fs_info);
+void btrfs_drop_and_free_fs_root(struct btrfs_fs_info *fs_info,
+ struct btrfs_root *root);
+int btrfs_validate_metadata_buffer(struct btrfs_io_bio *io_bio, u64 phy_offset,
+ struct page *page, u64 start, u64 end,
+ int mirror);
+blk_status_t btrfs_submit_metadata_bio(struct inode *inode, struct bio *bio,
+ int mirror_num, unsigned long bio_flags);
+#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
+struct btrfs_root *btrfs_alloc_dummy_root(struct btrfs_fs_info *fs_info);
+#endif
+
+/*
+ * This function is used to grab the root, and avoid it is freed when we
+ * access it. But it doesn't ensure that the tree is not dropped.
+ *
+ * If you want to ensure the whole tree is safe, you should use
+ * fs_info->subvol_srcu
+ */
+static inline struct btrfs_root *btrfs_grab_root(struct btrfs_root *root)
+{
+ if (!root)
+ return NULL;
+ if (refcount_inc_not_zero(&root->refs))
+ return root;
+ return NULL;
+}
+
+void btrfs_put_root(struct btrfs_root *root);
+void btrfs_mark_buffer_dirty(struct extent_buffer *buf);
+int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid,
+ int atomic);
+int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid, int level,
+ struct btrfs_key *first_key);
+blk_status_t btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio,
+ enum btrfs_wq_endio_type metadata);
+blk_status_t btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct bio *bio,
+ int mirror_num, unsigned long bio_flags,
+ u64 bio_offset, void *private_data,
+ extent_submit_bio_start_t *submit_bio_start);
+blk_status_t btrfs_submit_bio_done(void *private_data, struct bio *bio,
+ int mirror_num);
+int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans,
+ struct btrfs_fs_info *fs_info);
+int btrfs_add_log_tree(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root);
+void btrfs_cleanup_dirty_bgs(struct btrfs_transaction *trans,
+ struct btrfs_fs_info *fs_info);
+void btrfs_cleanup_one_transaction(struct btrfs_transaction *trans,
+ struct btrfs_fs_info *fs_info);
+struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans,
+ u64 objectid);
+int btree_lock_page_hook(struct page *page, void *data,
+ void (*flush_fn)(void *));
+int btrfs_get_num_tolerated_disk_barrier_failures(u64 flags);
+int btrfs_find_free_objectid(struct btrfs_root *root, u64 *objectid);
+int btrfs_find_highest_objectid(struct btrfs_root *root, u64 *objectid);
+int __init btrfs_end_io_wq_init(void);
+void __cold btrfs_end_io_wq_exit(void);
+
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+void btrfs_init_lockdep(void);
+void btrfs_set_buffer_lockdep_class(u64 objectid,
+ struct extent_buffer *eb, int level);
+#else
+static inline void btrfs_init_lockdep(void)
+{ }
+static inline void btrfs_set_buffer_lockdep_class(u64 objectid,
+ struct extent_buffer *eb, int level)
+{
+}
+#endif
+
+#endif