| From | Jiri Slaby <> | Subject | [PATCH 3.12 169/181] Btrfs: set right total device count for seeding support | Date | Mon, 30 Jun 2014 13:53:10 +0200 |
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From: Wang Shilong <wangsl.fnst@cn.fujitsu.com>
3.12-stable review patch. If anyone has any objections, please let me know.
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commit 298658414a2f0bea1f05a81876a45c1cd96aa2e0 upstream.
Seeding device support allows us to create a new filesystem based on existed filesystem.
However newly created filesystem's @total_devices should include seed devices. This patch fix the following problem:
# mkfs.btrfs -f /dev/sdb # btrfstune -S 1 /dev/sdb # mount /dev/sdb /mnt # btrfs device add -f /dev/sdc /mnt --->fs_devices->total_devices = 1 # umount /mnt # mount /dev/sdc /mnt --->fs_devices->total_devices = 2
This is because we record right @total_devices in superblock, but @fs_devices->total_devices is reset to be 0 in btrfs_prepare_sprout().
Fix this problem by not resetting @fs_devices->total_devices.
Signed-off-by: Wang Shilong <wangsl.fnst@cn.fujitsu.com> Signed-off-by: Chris Mason <clm@fb.com> Signed-off-by: Jiri Slaby <jslaby@suse.cz> --- fs/btrfs/volumes.c | 1 - 1 file changed, 1 deletion(-)
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c index f0f50531c6c3..c06616106fa9 100644 --- a/fs/btrfs/volumes.c +++ b/fs/btrfs/volumes.c @@ -1889,7 +1889,6 @@ static int btrfs_prepare_sprout(struct btrfs_root *root) fs_devices->seeding = 0; fs_devices->num_devices = 0; fs_devices->open_devices = 0; - fs_devices->total_devices = 0; fs_devices->seed = seed_devices; generate_random_uuid(fs_devices->fsid); -- 2.0.0
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