This new function is used by the device replace procedure in
a later patch.
Signed-off-by: Stefan Behrens <sbehrens@xxxxxxxxxxxxxxxx>
---
fs/btrfs/volumes.c | 18 ++++++++++++++++++
fs/btrfs/volumes.h | 1 +
2 files changed, 19 insertions(+)
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index c79f8db..bf5e68b 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -5111,3 +5111,21 @@ 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 ad5566d..7eaaf4e 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)
--
1.8.0
--
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