172 lines
6.1 KiB
C
172 lines
6.1 KiB
C
/*
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* Copyright (C) 2007 Oracle. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License v2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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*/
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#ifndef __DISKIO__
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#define __DISKIO__
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#define BTRFS_SUPER_INFO_OFFSET SZ_64K
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#define BTRFS_SUPER_INFO_SIZE 4096
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#define BTRFS_SUPER_MIRROR_MAX 3
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#define BTRFS_SUPER_MIRROR_SHIFT 12
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/*
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* Fixed blocksize for all devices, applies to specific ways of reading
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* metadata like superblock. Must meet the set_blocksize requirements.
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*
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* Do not change.
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*/
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#define BTRFS_BDEV_BLOCKSIZE (4096)
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enum btrfs_wq_endio_type {
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BTRFS_WQ_ENDIO_DATA = 0,
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BTRFS_WQ_ENDIO_METADATA = 1,
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BTRFS_WQ_ENDIO_FREE_SPACE = 2,
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BTRFS_WQ_ENDIO_RAID56 = 3,
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BTRFS_WQ_ENDIO_DIO_REPAIR = 4,
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};
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static inline u64 btrfs_sb_offset(int mirror)
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{
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u64 start = SZ_16K;
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if (mirror)
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return start << (BTRFS_SUPER_MIRROR_SHIFT * mirror);
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return BTRFS_SUPER_INFO_OFFSET;
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}
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struct btrfs_device;
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struct btrfs_fs_devices;
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struct extent_buffer *read_tree_block(struct btrfs_fs_info *fs_info,
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u64 bytenr, u64 parent_transid);
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void readahead_tree_block(struct btrfs_fs_info *fs_info, u64 bytenr);
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int reada_tree_block_flagged(struct btrfs_fs_info *fs_info, u64 bytenr,
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int mirror_num, struct extent_buffer **eb);
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struct extent_buffer *btrfs_find_create_tree_block(
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struct btrfs_fs_info *fs_info,
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u64 bytenr);
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void clean_tree_block(struct btrfs_fs_info *fs_info, struct extent_buffer *buf);
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int open_ctree(struct super_block *sb,
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struct btrfs_fs_devices *fs_devices,
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char *options);
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void close_ctree(struct btrfs_fs_info *fs_info);
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int write_all_supers(struct btrfs_fs_info *fs_info, int max_mirrors);
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struct buffer_head *btrfs_read_dev_super(struct block_device *bdev);
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int btrfs_read_dev_one_super(struct block_device *bdev, int copy_num,
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struct buffer_head **bh_ret);
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int btrfs_commit_super(struct btrfs_fs_info *fs_info);
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struct btrfs_root *btrfs_read_fs_root(struct btrfs_root *tree_root,
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struct btrfs_key *location);
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int btrfs_init_fs_root(struct btrfs_root *root);
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struct btrfs_root *btrfs_lookup_fs_root(struct btrfs_fs_info *fs_info,
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u64 root_id);
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int btrfs_insert_fs_root(struct btrfs_fs_info *fs_info,
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struct btrfs_root *root);
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void btrfs_free_fs_roots(struct btrfs_fs_info *fs_info);
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struct btrfs_root *btrfs_get_fs_root(struct btrfs_fs_info *fs_info,
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struct btrfs_key *key,
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bool check_ref);
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static inline struct btrfs_root *
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btrfs_read_fs_root_no_name(struct btrfs_fs_info *fs_info,
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struct btrfs_key *location)
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{
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return btrfs_get_fs_root(fs_info, location, true);
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}
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int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info);
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void btrfs_btree_balance_dirty(struct btrfs_fs_info *fs_info);
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void btrfs_btree_balance_dirty_nodelay(struct btrfs_fs_info *fs_info);
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void btrfs_drop_and_free_fs_root(struct btrfs_fs_info *fs_info,
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struct btrfs_root *root);
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void btrfs_free_fs_root(struct btrfs_root *root);
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#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
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struct btrfs_root *btrfs_alloc_dummy_root(struct btrfs_fs_info *fs_info);
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#endif
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/*
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* This function is used to grab the root, and avoid it is freed when we
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* access it. But it doesn't ensure that the tree is not dropped.
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*
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* If you want to ensure the whole tree is safe, you should use
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* fs_info->subvol_srcu
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*/
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static inline struct btrfs_root *btrfs_grab_fs_root(struct btrfs_root *root)
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{
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if (refcount_inc_not_zero(&root->refs))
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return root;
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return NULL;
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}
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static inline void btrfs_put_fs_root(struct btrfs_root *root)
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{
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if (refcount_dec_and_test(&root->refs))
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kfree(root);
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}
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void btrfs_mark_buffer_dirty(struct extent_buffer *buf);
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int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid,
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int atomic);
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int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid);
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u32 btrfs_csum_data(const char *data, u32 seed, size_t len);
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void btrfs_csum_final(u32 crc, u8 *result);
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blk_status_t btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio,
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enum btrfs_wq_endio_type metadata);
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blk_status_t btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct bio *bio,
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int mirror_num, unsigned long bio_flags,
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u64 bio_offset, void *private_data,
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extent_submit_bio_hook_t *submit_bio_start,
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extent_submit_bio_hook_t *submit_bio_done);
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unsigned long btrfs_async_submit_limit(struct btrfs_fs_info *info);
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int btrfs_write_tree_block(struct extent_buffer *buf);
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void btrfs_wait_tree_block_writeback(struct extent_buffer *buf);
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int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans,
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struct btrfs_fs_info *fs_info);
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int btrfs_add_log_tree(struct btrfs_trans_handle *trans,
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struct btrfs_root *root);
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void btrfs_cleanup_dirty_bgs(struct btrfs_transaction *trans,
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struct btrfs_fs_info *fs_info);
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void btrfs_cleanup_one_transaction(struct btrfs_transaction *trans,
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struct btrfs_fs_info *fs_info);
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struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans,
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struct btrfs_fs_info *fs_info,
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u64 objectid);
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int btree_lock_page_hook(struct page *page, void *data,
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void (*flush_fn)(void *));
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struct extent_map *btree_get_extent(struct btrfs_inode *inode,
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struct page *page, size_t pg_offset, u64 start, u64 len,
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int create);
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int btrfs_get_num_tolerated_disk_barrier_failures(u64 flags);
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int __init btrfs_end_io_wq_init(void);
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void btrfs_end_io_wq_exit(void);
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#ifdef CONFIG_DEBUG_LOCK_ALLOC
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void btrfs_init_lockdep(void);
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void btrfs_set_buffer_lockdep_class(u64 objectid,
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struct extent_buffer *eb, int level);
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#else
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static inline void btrfs_init_lockdep(void)
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{ }
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static inline void btrfs_set_buffer_lockdep_class(u64 objectid,
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struct extent_buffer *eb, int level)
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{
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}
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#endif
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#endif
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