b9fab919b7
verify_parent_transid needs to lock the extent range to make sure no IO is underway, and so it can safely clear the uptodate bits if our checks fail. But, a few callers are using it with spinlocks held. Most of the time, the generation numbers are going to match, and we don't want to switch to a blocking lock just for the error case. This adds an atomic flag to verify_parent_transid, and changes it to return EAGAIN if it needs to block to properly verifiy things. Signed-off-by: Chris Mason <chris.mason@oracle.com>
107 lines
4.3 KiB
C
107 lines
4.3 KiB
C
/*
|
|
* Copyright (C) 2007 Oracle. All rights reserved.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public
|
|
* License v2 as published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public
|
|
* License along with this program; if not, write to the
|
|
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
|
* Boston, MA 021110-1307, USA.
|
|
*/
|
|
|
|
#ifndef __DISKIO__
|
|
#define __DISKIO__
|
|
|
|
#define BTRFS_SUPER_INFO_OFFSET (64 * 1024)
|
|
#define BTRFS_SUPER_INFO_SIZE 4096
|
|
|
|
#define BTRFS_SUPER_MIRROR_MAX 3
|
|
#define BTRFS_SUPER_MIRROR_SHIFT 12
|
|
|
|
static inline u64 btrfs_sb_offset(int mirror)
|
|
{
|
|
u64 start = 16 * 1024;
|
|
if (mirror)
|
|
return start << (BTRFS_SUPER_MIRROR_SHIFT * mirror);
|
|
return BTRFS_SUPER_INFO_OFFSET;
|
|
}
|
|
|
|
struct btrfs_device;
|
|
struct btrfs_fs_devices;
|
|
|
|
struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr,
|
|
u32 blocksize, u64 parent_transid);
|
|
int readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize,
|
|
u64 parent_transid);
|
|
int reada_tree_block_flagged(struct btrfs_root *root, u64 bytenr, u32 blocksize,
|
|
int mirror_num, struct extent_buffer **eb);
|
|
struct extent_buffer *btrfs_find_create_tree_block(struct btrfs_root *root,
|
|
u64 bytenr, u32 blocksize);
|
|
void clean_tree_block(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root, struct extent_buffer *buf);
|
|
int open_ctree(struct super_block *sb,
|
|
struct btrfs_fs_devices *fs_devices,
|
|
char *options);
|
|
int close_ctree(struct btrfs_root *root);
|
|
int write_ctree_super(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root, int max_mirrors);
|
|
struct buffer_head *btrfs_read_dev_super(struct block_device *bdev);
|
|
int btrfs_commit_super(struct btrfs_root *root);
|
|
int btrfs_error_commit_super(struct btrfs_root *root);
|
|
struct extent_buffer *btrfs_find_tree_block(struct btrfs_root *root,
|
|
u64 bytenr, u32 blocksize);
|
|
struct btrfs_root *btrfs_read_fs_root_no_radix(struct btrfs_root *tree_root,
|
|
struct btrfs_key *location);
|
|
struct btrfs_root *btrfs_read_fs_root_no_name(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_key *location);
|
|
int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info);
|
|
void btrfs_btree_balance_dirty(struct btrfs_root *root, unsigned long nr);
|
|
void __btrfs_btree_balance_dirty(struct btrfs_root *root, unsigned long nr);
|
|
void btrfs_free_fs_root(struct btrfs_fs_info *fs_info, 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_set_buffer_uptodate(struct extent_buffer *buf);
|
|
int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid);
|
|
u32 btrfs_csum_data(struct btrfs_root *root, char *data, u32 seed, size_t len);
|
|
void btrfs_csum_final(u32 crc, char *result);
|
|
int btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio,
|
|
int metadata);
|
|
int btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct inode *inode,
|
|
int rw, struct bio *bio, int mirror_num,
|
|
unsigned long bio_flags, u64 bio_offset,
|
|
extent_submit_bio_hook_t *submit_bio_start,
|
|
extent_submit_bio_hook_t *submit_bio_done);
|
|
unsigned long btrfs_async_submit_limit(struct btrfs_fs_info *info);
|
|
int btrfs_write_tree_block(struct extent_buffer *buf);
|
|
int btrfs_wait_tree_block_writeback(struct extent_buffer *buf);
|
|
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);
|
|
int btrfs_cleanup_transaction(struct btrfs_root *root);
|
|
void btrfs_cleanup_one_transaction(struct btrfs_transaction *trans,
|
|
struct btrfs_root *root);
|
|
void btrfs_abort_devices(struct btrfs_root *root);
|
|
|
|
#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
|