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#include <linux/sizes.h>
 10#include <linux/compiler_types.h>
 11#include "ctree.h"
 12#include "fs.h"
 13
 14struct block_device;
 15struct super_block;
 16struct extent_buffer;
 17struct btrfs_device;
 18struct btrfs_fs_devices;
 19struct btrfs_fs_info;
 20struct btrfs_super_block;
 21struct btrfs_trans_handle;
 22struct btrfs_tree_parent_check;
 23struct btrfs_transaction;
 24
 25#define BTRFS_SUPER_MIRROR_MAX	 3
 26#define BTRFS_SUPER_MIRROR_SHIFT 12
 27
 28/*
 29 * Fixed blocksize for all devices, applies to specific ways of reading
 30 * metadata like superblock. Must meet the set_blocksize requirements.
 31 *
 32 * Do not change.
 33 */
 34#define BTRFS_BDEV_BLOCKSIZE	(4096)
 35
 36static inline u64 btrfs_sb_offset(int mirror)
 37{
 38	u64 start = SZ_16K;
 39	if (mirror)
 40		return start << (BTRFS_SUPER_MIRROR_SHIFT * mirror);
 41	return BTRFS_SUPER_INFO_OFFSET;
 42}
 43
 44void btrfs_check_leaked_roots(const struct btrfs_fs_info *fs_info);
 45void btrfs_init_fs_info(struct btrfs_fs_info *fs_info);
 46struct extent_buffer *read_tree_block(struct btrfs_fs_info *fs_info, u64 bytenr,
 47				      struct btrfs_tree_parent_check *check);
 48struct extent_buffer *btrfs_find_create_tree_block(
 49						struct btrfs_fs_info *fs_info,
 50						u64 bytenr, u64 owner_root,
 51						int level);
 52int btrfs_start_pre_rw_mount(struct btrfs_fs_info *fs_info);
 53int btrfs_check_super_csum(struct btrfs_fs_info *fs_info,
 54			   const struct btrfs_super_block *disk_sb);
 55int __cold open_ctree(struct super_block *sb, struct btrfs_fs_devices *fs_devices);
 56void __cold close_ctree(struct btrfs_fs_info *fs_info);
 57int btrfs_validate_super(const struct btrfs_fs_info *fs_info,
 58			 const struct btrfs_super_block *sb, int mirror_num);
 59int btrfs_check_features(struct btrfs_fs_info *fs_info, bool is_rw_mount);
 60int write_all_supers(struct btrfs_fs_info *fs_info, int max_mirrors);
 61struct btrfs_super_block *btrfs_read_dev_super(struct block_device *bdev);
 62struct btrfs_super_block *btrfs_read_dev_one_super(struct block_device *bdev,
 63						   int copy_num, bool drop_cache);
 64int btrfs_commit_super(struct btrfs_fs_info *fs_info);
 65struct btrfs_root *btrfs_read_tree_root(struct btrfs_root *tree_root,
 66					const struct btrfs_key *key);
 
 
 
 
 67int btrfs_insert_fs_root(struct btrfs_fs_info *fs_info,
 68			 struct btrfs_root *root);
 69void btrfs_free_fs_roots(struct btrfs_fs_info *fs_info);
 70
 71struct btrfs_root *btrfs_get_fs_root(struct btrfs_fs_info *fs_info,
 72				     u64 objectid, bool check_ref);
 73struct btrfs_root *btrfs_get_new_fs_root(struct btrfs_fs_info *fs_info,
 74					 u64 objectid, dev_t *anon_dev);
 75struct btrfs_root *btrfs_get_fs_root_commit_root(struct btrfs_fs_info *fs_info,
 76						 struct btrfs_path *path,
 77						 u64 objectid);
 78int btrfs_global_root_insert(struct btrfs_root *root);
 79void btrfs_global_root_delete(struct btrfs_root *root);
 80struct btrfs_root *btrfs_global_root(struct btrfs_fs_info *fs_info,
 81				     struct btrfs_key *key);
 82struct btrfs_root *btrfs_csum_root(struct btrfs_fs_info *fs_info, u64 bytenr);
 83struct btrfs_root *btrfs_extent_root(struct btrfs_fs_info *fs_info, u64 bytenr);
 84
 85void btrfs_free_fs_info(struct btrfs_fs_info *fs_info);
 86void btrfs_btree_balance_dirty(struct btrfs_fs_info *fs_info);
 87void btrfs_btree_balance_dirty_nodelay(struct btrfs_fs_info *fs_info);
 88void btrfs_drop_and_free_fs_root(struct btrfs_fs_info *fs_info,
 89				 struct btrfs_root *root);
 90int btrfs_validate_extent_buffer(struct extent_buffer *eb,
 91				 const struct btrfs_tree_parent_check *check);
 92#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
 93struct btrfs_root *btrfs_alloc_dummy_root(struct btrfs_fs_info *fs_info);
 94#endif
 95
 96/*
 97 * This function is used to grab the root, and avoid it is freed when we
 98 * access it. But it doesn't ensure that the tree is not dropped.
 99 *
100 * If you want to ensure the whole tree is safe, you should use
101 * 	fs_info->subvol_srcu
102 */
103static inline struct btrfs_root *btrfs_grab_root(struct btrfs_root *root)
104{
105	if (!root)
106		return NULL;
107	if (refcount_inc_not_zero(&root->refs))
108		return root;
109	return NULL;
110}
111
112void btrfs_put_root(struct btrfs_root *root);
113void btrfs_mark_buffer_dirty(struct btrfs_trans_handle *trans,
114			     struct extent_buffer *buf);
 
 
 
 
115int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid,
116			  int atomic);
117int btrfs_read_extent_buffer(struct extent_buffer *buf,
118			     const struct btrfs_tree_parent_check *check);
119
120blk_status_t btree_csum_one_bio(struct btrfs_bio *bbio);
121int btrfs_alloc_log_tree_node(struct btrfs_trans_handle *trans,
122			      struct btrfs_root *root);
 
 
 
 
 
 
 
123int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans,
124			     struct btrfs_fs_info *fs_info);
125int btrfs_add_log_tree(struct btrfs_trans_handle *trans,
126		       struct btrfs_root *root);
127void btrfs_cleanup_dirty_bgs(struct btrfs_transaction *trans,
128			     struct btrfs_fs_info *fs_info);
129void btrfs_cleanup_one_transaction(struct btrfs_transaction *trans);
130struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans,
 
131				     u64 objectid);
 
 
132int btrfs_get_num_tolerated_disk_barrier_failures(u64 flags);
133int btrfs_get_free_objectid(struct btrfs_root *root, u64 *objectid);
134int btrfs_init_root_free_objectid(struct btrfs_root *root);
135
 
 
 
 
 
 
 
 
 
 
 
 
 
 
136#endif

 
  1/*
  2 * Copyright (C) 2007 Oracle.  All rights reserved.
  3 *
  4 * This program is free software; you can redistribute it and/or
  5 * modify it under the terms of the GNU General Public
  6 * License v2 as published by the Free Software Foundation.
  7 *
  8 * This program is distributed in the hope that it will be useful,
  9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 11 * General Public License for more details.
 12 *
 13 * You should have received a copy of the GNU General Public
 14 * License along with this program; if not, write to the
 15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 16 * Boston, MA 021110-1307, USA.
 17 */
 18
 19#ifndef __DISKIO__
 20#define __DISKIO__
 21
 22#define BTRFS_SUPER_INFO_OFFSET SZ_64K
 23#define BTRFS_SUPER_INFO_SIZE 4096
 
 
 
 
 
 
 
 
 
 
 
 
 
 24
 25#define BTRFS_SUPER_MIRROR_MAX	 3
 26#define BTRFS_SUPER_MIRROR_SHIFT 12
 27
 28enum btrfs_wq_endio_type {
 29	BTRFS_WQ_ENDIO_DATA = 0,
 30	BTRFS_WQ_ENDIO_METADATA = 1,
 31	BTRFS_WQ_ENDIO_FREE_SPACE = 2,
 32	BTRFS_WQ_ENDIO_RAID56 = 3,
 33	BTRFS_WQ_ENDIO_DIO_REPAIR = 4,
 34};
 35
 36static inline u64 btrfs_sb_offset(int mirror)
 37{
 38	u64 start = SZ_16K;
 39	if (mirror)
 40		return start << (BTRFS_SUPER_MIRROR_SHIFT * mirror);
 41	return BTRFS_SUPER_INFO_OFFSET;
 42}
 43
 44struct btrfs_device;
 45struct btrfs_fs_devices;
 46
 47struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr,
 48				      u64 parent_transid);
 49void readahead_tree_block(struct btrfs_root *root, u64 bytenr);
 50int reada_tree_block_flagged(struct btrfs_root *root, u64 bytenr,
 51			 int mirror_num, struct extent_buffer **eb);
 52struct extent_buffer *btrfs_find_create_tree_block(struct btrfs_root *root,
 53						   u64 bytenr);
 54void clean_tree_block(struct btrfs_trans_handle *trans,
 55		      struct btrfs_fs_info *fs_info, struct extent_buffer *buf);
 56int open_ctree(struct super_block *sb,
 57	       struct btrfs_fs_devices *fs_devices,
 58	       char *options);
 59void close_ctree(struct btrfs_root *root);
 60int write_ctree_super(struct btrfs_trans_handle *trans,
 61		      struct btrfs_root *root, int max_mirrors);
 62struct buffer_head *btrfs_read_dev_super(struct block_device *bdev);
 63int btrfs_read_dev_one_super(struct block_device *bdev, int copy_num,
 64			struct buffer_head **bh_ret);
 65int btrfs_commit_super(struct btrfs_root *root);
 66struct extent_buffer *btrfs_find_tree_block(struct btrfs_fs_info *fs_info,
 67					    u64 bytenr);
 68struct btrfs_root *btrfs_read_fs_root(struct btrfs_root *tree_root,
 69				      struct btrfs_key *location);
 70int btrfs_init_fs_root(struct btrfs_root *root);
 71int btrfs_insert_fs_root(struct btrfs_fs_info *fs_info,
 72			 struct btrfs_root *root);
 73void btrfs_free_fs_roots(struct btrfs_fs_info *fs_info);
 74
 75struct btrfs_root *btrfs_get_fs_root(struct btrfs_fs_info *fs_info,
 76				     struct btrfs_key *key,
 77				     bool check_ref);
 78static inline struct btrfs_root *
 79btrfs_read_fs_root_no_name(struct btrfs_fs_info *fs_info,
 80			   struct btrfs_key *location)
 81{
 82	return btrfs_get_fs_root(fs_info, location, true);
 83}
 84
 85int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info);
 86void btrfs_btree_balance_dirty(struct btrfs_root *root);
 87void btrfs_btree_balance_dirty_nodelay(struct btrfs_root *root);
 
 
 
 
 88void btrfs_drop_and_free_fs_root(struct btrfs_fs_info *fs_info,
 89				 struct btrfs_root *root);
 90void btrfs_free_fs_root(struct btrfs_root *root);
 91
 92#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
 93struct btrfs_root *btrfs_alloc_dummy_root(void);
 94#endif
 95
 96/*
 97 * This function is used to grab the root, and avoid it is freed when we
 98 * access it. But it doesn't ensure that the tree is not dropped.
 99 *
100 * If you want to ensure the whole tree is safe, you should use
101 * 	fs_info->subvol_srcu
102 */
103static inline struct btrfs_root *btrfs_grab_fs_root(struct btrfs_root *root)
104{
105	if (atomic_inc_not_zero(&root->refs))
 
 
106		return root;
107	return NULL;
108}
109
110static inline void btrfs_put_fs_root(struct btrfs_root *root)
111{
112	if (atomic_dec_and_test(&root->refs))
113		kfree(root);
114}
115
116void btrfs_mark_buffer_dirty(struct extent_buffer *buf);
117int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid,
118			  int atomic);
119int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid);
120u32 btrfs_csum_data(char *data, u32 seed, size_t len);
121void btrfs_csum_final(u32 crc, char *result);
122int btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio,
123			enum btrfs_wq_endio_type metadata);
124int btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct inode *inode,
125			int rw, struct bio *bio, int mirror_num,
126			unsigned long bio_flags, u64 bio_offset,
127			extent_submit_bio_hook_t *submit_bio_start,
128			extent_submit_bio_hook_t *submit_bio_done);
129unsigned long btrfs_async_submit_limit(struct btrfs_fs_info *info);
130int btrfs_write_tree_block(struct extent_buffer *buf);
131int btrfs_wait_tree_block_writeback(struct extent_buffer *buf);
132int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans,
133			     struct btrfs_fs_info *fs_info);
134int btrfs_add_log_tree(struct btrfs_trans_handle *trans,
135		       struct btrfs_root *root);
136void btrfs_cleanup_one_transaction(struct btrfs_transaction *trans,
137				  struct btrfs_root *root);
 
138struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans,
139				     struct btrfs_fs_info *fs_info,
140				     u64 objectid);
141int btree_lock_page_hook(struct page *page, void *data,
142				void (*flush_fn)(void *));
143int btrfs_get_num_tolerated_disk_barrier_failures(u64 flags);
144int btrfs_calc_num_tolerated_disk_barrier_failures(
145	struct btrfs_fs_info *fs_info);
146int __init btrfs_end_io_wq_init(void);
147void btrfs_end_io_wq_exit(void);
148
149#ifdef CONFIG_DEBUG_LOCK_ALLOC
150void btrfs_init_lockdep(void);
151void btrfs_set_buffer_lockdep_class(u64 objectid,
152			            struct extent_buffer *eb, int level);
153#else
154static inline void btrfs_init_lockdep(void)
155{ }
156static inline void btrfs_set_buffer_lockdep_class(u64 objectid,
157					struct extent_buffer *eb, int level)
158{
159}
160#endif
161#endif