Commit a8a6dab7 authored by Stefan Behrens's avatar Stefan Behrens Committed by Josef Bacik
Browse files

Btrfs: add btrfs_scratch_superblock() function 



This new function is used by the device replace procedure in
a later patch.

Signed-off-by: default avatarStefan Behrens <sbehrens@giantdisaster.de>
Signed-off-by: default avatarChris Mason <chris.mason@fusionio.com>
parent 3ec706c8

fs/btrfs/volumes.c

+18 −0
Original line number Diff line number Diff line
@@ -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;

}

fs/btrfs/volumes.h

+1 −0
Original line number Diff line number Diff line
@@ -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)