From 5f546063cee93047af90cf2756e023da9f9fca51 Mon Sep 17 00:00:00 2001 From: Miao Xie Date: Thu, 24 Jul 2014 11:37:09 +0800 Subject: [PATCH] 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 --- fs/btrfs/scrub.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/fs/btrfs/scrub.c b/fs/btrfs/scrub.c index d1aa95a..72c8981 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); -- 2.7.4