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| 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/volumes.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/volumes.h')
| -rw-r--r-- | fs/btrfs/volumes.h | 4 |
1 files changed, 1 insertions, 3 deletions
diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h index 52181897446e..7fa392f38262 100644 --- a/fs/btrfs/volumes.h +++ b/fs/btrfs/volumes.h @@ -17,8 +17,6 @@ extern struct mutex uuid_mutex; #define BTRFS_STRIPE_LEN SZ_64K -struct buffer_head; - struct btrfs_io_geometry { /* remaining bytes before crossing a stripe */ u64 len; @@ -483,7 +481,7 @@ int btrfs_finish_chunk_alloc(struct btrfs_trans_handle *trans, int btrfs_remove_chunk(struct btrfs_trans_handle *trans, u64 chunk_offset); struct extent_map *btrfs_get_chunk_map(struct btrfs_fs_info *fs_info, u64 logical, u64 length); -void btrfs_release_disk_super(struct page *page); +void btrfs_release_disk_super(struct btrfs_super_block *super); static inline void btrfs_dev_stat_inc(struct btrfs_device *dev, int index) |