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authorStefan Behrens <sbehrens@giantdisaster.de>2012-11-05 15:50:14 +0100
committerJosef Bacik <jbacik@fusionio.com>2012-12-12 17:15:35 -0500
commita8a6dab77997a371f1925a4001021eea3ee5cb88 (patch)
tree6dc4eb0c51673652e01877619cc98fbcd1825778 /fs
parent3ec706c831d4c96905c287013c8228b21619a1d9 (diff)
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')
-rw-r--r--fs/btrfs/volumes.c18
-rw-r--r--fs/btrfs/volumes.h1
2 files changed, 19 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;
+}
diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h
index ad5566d4f2c8..7eaaf4e61959 100644
--- a/fs/btrfs/volumes.h
+++ b/fs/btrfs/volumes.h
@@ -301,6 +301,7 @@ int btrfs_get_dev_stats(struct btrfs_root *root,
int btrfs_init_dev_stats(struct btrfs_fs_info *fs_info);
int btrfs_run_dev_stats(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info);
+int btrfs_scratch_superblock(struct btrfs_device *device);
static inline void btrfs_dev_stat_inc(struct btrfs_device *dev,
int index)