On Mon, Feb 13, 2017 at 10:33:55AM +0100, David Sterba wrote:
> None of the checks need to know the RO/RW status.
>
OK...there was a readonly check, which lets us skip all checks,
it was removed by the below commit, should we add the check back?
commit 1104a8855109a4051d74977f819a13b4516aa11e
Author: David Sterba <dsterba@xxxxxxx>
Date: Wed Mar 6 15:57:46 2013 +0100
btrfs: enhance superblock checks
The superblock checksum is not verified upon mount. <awkward silence>
Add that check and also reorder existing checks to a more logical
order.
Current mkfs.btrfs does not calculate the correct checksum of
super_block and thus a freshly created filesytem will fail to mount when
this patch is applied.
First transaction commit calculates correct superblock checksum and
saves it to disk.
Reproducer:
$ mfks.btrfs /dev/sda
$ mount /dev/sda /mnt
$ btrfs scrub start /mnt
$ sleep 5
$ btrfs scrub status /mnt
... super:2 ...
Signed-off-by: David Sterba <dsterba@xxxxxxx>
Signed-off-by: Josef Bacik <jbacik@xxxxxxxxxxxx>
Signed-off-by: Chris Mason <chris.mason@xxxxxxxxxxxx>
Thanks,
-liubo
> Signed-off-by: David Sterba <dsterba@xxxxxxxx>
> ---
> fs/btrfs/disk-io.c | 8 +++-----
> 1 file changed, 3 insertions(+), 5 deletions(-)
>
> diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
> index 441a62cd0351..2b06f557c176 100644
> --- a/fs/btrfs/disk-io.c
> +++ b/fs/btrfs/disk-io.c
> @@ -64,8 +64,7 @@
> static const struct extent_io_ops btree_extent_io_ops;
> static void end_workqueue_fn(struct btrfs_work *work);
> static void free_fs_root(struct btrfs_root *root);
> -static int btrfs_check_super_valid(struct btrfs_fs_info *fs_info,
> - int read_only);
> +static int btrfs_check_super_valid(struct btrfs_fs_info *fs_info);
> static void btrfs_destroy_ordered_extents(struct btrfs_root *root);
> static int btrfs_destroy_delayed_refs(struct btrfs_transaction *trans,
> struct btrfs_fs_info *fs_info);
> @@ -2801,7 +2800,7 @@ int open_ctree(struct super_block *sb,
>
> memcpy(fs_info->fsid, fs_info->super_copy->fsid, BTRFS_FSID_SIZE);
>
> - ret = btrfs_check_super_valid(fs_info, sb->s_flags & MS_RDONLY);
> + ret = btrfs_check_super_valid(fs_info);
> if (ret) {
> btrfs_err(fs_info, "superblock contains fatal errors");
> err = -EINVAL;
> @@ -4115,8 +4114,7 @@ int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid)
> return btree_read_extent_buffer_pages(fs_info, buf, parent_transid);
> }
>
> -static int btrfs_check_super_valid(struct btrfs_fs_info *fs_info,
> - int read_only)
> +static int btrfs_check_super_valid(struct btrfs_fs_info *fs_info)
> {
> struct btrfs_super_block *sb = fs_info->super_copy;
> u64 nodesize = btrfs_super_nodesize(sb);
> --
> 2.10.1
>
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