From: Miao Xie Date: Thu, 24 Jul 2014 03:37:09 +0000 (+0800) Subject: Btrfs: fix wrong generation check of super block on a seed device X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=5f546063cee93047af90cf2756e023da9f9fca51;p=linux-beck.git Btrfs: fix wrong generation check of super block on a seed device The super block generation of the seed devices is not the same as the filesystem which sprouted from them because we don't update the super block on the seed devices when we change that new filesystem. So we should not use the generation of that new filesystem to check the super block generation on the seed devices, Fix it. Signed-off-by: Miao Xie Reviewed-by: David Sterba Signed-off-by: Chris Mason --- diff --git a/fs/btrfs/scrub.c b/fs/btrfs/scrub.c index d1aa95a4f843..72c8981e7c0a 100644 --- a/fs/btrfs/scrub.c +++ b/fs/btrfs/scrub.c @@ -2832,7 +2832,11 @@ static noinline_for_stack int scrub_supers(struct scrub_ctx *sctx, if (test_bit(BTRFS_FS_STATE_ERROR, &root->fs_info->fs_state)) return -EIO; - gen = root->fs_info->last_trans_committed; + /* Seed devices of a new filesystem has their own generation. */ + if (scrub_dev->fs_devices != root->fs_info->fs_devices) + gen = scrub_dev->generation; + else + gen = root->fs_info->last_trans_committed; for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) { bytenr = btrfs_sb_offset(i);