diff options
| author | Stefan Behrens <sbehrens@giantdisaster.de> | 2012-11-05 18:50:14 +0400 |
|---|---|---|
| committer | Josef Bacik <jbacik@fusionio.com> | 2012-12-13 02:15:35 +0400 |
| commit | a8a6dab77997a371f1925a4001021eea3ee5cb88 (patch) | |
| tree | 6dc4eb0c51673652e01877619cc98fbcd1825778 /fs/btrfs/volumes.c | |
| parent | 3ec706c831d4c96905c287013c8228b21619a1d9 (diff) | |
| download | linux-a8a6dab77997a371f1925a4001021eea3ee5cb88.tar.xz | |
Btrfs: add btrfs_scratch_superblock() function
This new function is used by the device replace procedure in
a later patch.
Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
Diffstat (limited to 'fs/btrfs/volumes.c')
| -rw-r--r-- | fs/btrfs/volumes.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c index 96bb2e4446aa..6cd8a32c4484 100644 --- a/fs/btrfs/volumes.c +++ b/fs/btrfs/volumes.c @@ -5106,3 +5106,21 @@ int btrfs_get_dev_stats(struct btrfs_root *root, stats->nr_items = BTRFS_DEV_STAT_VALUES_MAX; return 0; } + +int btrfs_scratch_superblock(struct btrfs_device *device) +{ + struct buffer_head *bh; + struct btrfs_super_block *disk_super; + + bh = btrfs_read_dev_super(device->bdev); + if (!bh) + return -EINVAL; + disk_super = (struct btrfs_super_block *)bh->b_data; + + memset(&disk_super->magic, 0, sizeof(disk_super->magic)); + set_buffer_dirty(bh); + sync_dirty_buffer(bh); + brelse(bh); + + return 0; +} |