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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>
This commit is contained in:
Stefan Behrens 2012-11-05 15:50:14 +01:00 committed by Josef Bacik
parent 3ec706c831
commit a8a6dab779
2 changed files with 19 additions and 0 deletions
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18
fs/btrfs/volumes.c
View File

@ -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;
}

1
fs/btrfs/volumes.h
View File

@ -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)