diff options
| author | Johannes Thumshirn <johannes.thumshirn@wdc.com> | 2020-02-13 18:24:32 +0300 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2020-03-23 19:01:39 +0300 |
| commit | 8f32380d3f2904ad0e98574ae17f2018f6dd277e (patch) | |
| tree | 1315f1288db65939eda182fb9e3b0195b701f890 /fs/btrfs/disk-io.h | |
| parent | 6fbceb9fa4f6749445bc0e2ac6750f0ae8e85b42 (diff) | |
| download | linux-8f32380d3f2904ad0e98574ae17f2018f6dd277e.tar.xz | |
btrfs: use the page cache for super block reading
Super-block reading in BTRFS is done using buffer_heads. Buffer_heads
have some drawbacks, like not being able to propagate errors from the
lower layers.
Directly use the page cache for reading the super blocks from disk or
invalidating an on-disk super block. We have to use the page cache so to
avoid races between mkfs and udev. See also 6f60cbd3ae44 ("btrfs: access
superblock via pagecache in scan_one_device").
This patch unwraps the buffer head API and does not change the way the
super block is actually read.
Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs/disk-io.h')
| -rw-r--r-- | fs/btrfs/disk-io.h | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/fs/btrfs/disk-io.h b/fs/btrfs/disk-io.h index db21ab614357..59c885860bf8 100644 --- a/fs/btrfs/disk-io.h +++ b/fs/btrfs/disk-io.h @@ -56,9 +56,9 @@ int __cold open_ctree(struct super_block *sb, 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 buffer_head *btrfs_read_dev_super(struct block_device *bdev); -int btrfs_read_dev_one_super(struct block_device *bdev, int copy_num, - struct buffer_head **bh_ret); +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); |