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 <mi...@cn.fujitsu.com> --- 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 9a81874e..98b9f8e 100644 --- a/fs/btrfs/scrub.c +++ b/fs/btrfs/scrub.c @@ -2835,7 +2835,11 @@ 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); -- 1.9.3 -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html