diff options
| -rw-r--r-- | fs/btrfs/volumes.c | 18 | ||||
| -rw-r--r-- | fs/btrfs/volumes.h | 1 |
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) |