From 298658414a2f0bea1f05a81876a45c1cd96aa2e0 Mon Sep 17 00:00:00 2001 From: Wang Shilong Date: Tue, 13 May 2014 17:05:06 +0800 Subject: [PATCH] Btrfs: set right total device count for seeding support 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 Signed-off-by: Chris Mason --- fs/btrfs/volumes.c | 1 - 1 file changed, 1 deletion(-) diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c index 018cde61..be8d671 100644 --- a/fs/btrfs/volumes.c +++ b/fs/btrfs/volumes.c @@ -1934,7 +1934,6 @@ 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); -- 2.7.4