On 8/5/15 3:13 PM, Eric Sandeen wrote:
> At some point along this sequence of changes:
>
> f6e63f9 ext4: fold ext4_nojournal_sops into ext4_sops
> bb04457 ext4: support freezing ext2 (nojournal) file systems
> 9ca9238 ext4: Use separate super_operations structure for no_journal filesystems
>
> ext4 started setting needs_recovery on filesystems without journals
> when they are unfrozen. This makes no sense, and in fact confuses
> blkid to the point where it doesn't recognize the filesystem at all.
>
> (freeze ext2; unfreeze ext2; run blkid; see no output; run dumpe2fs,
> see needs_recovery set on fs w/ no journal).
>
> To fix this, don't manipulate the INCOMPAT_RECOVER feature on
> filesystems without journals.
Ted, if this passes review you might cc: stable on the commit as well.
Thanks,
-Eric
> Reported-by: Stu Mark <smark@xxxxxxxxx>
> Signed-off-by: Eric Sandeen <sandeen@xxxxxxxxxx>
> ---
>
> Note, is there a reason that in ext4_freeze, if journal_flush
> fails, we skip the ext4_commit_super call? I didn't change that
> here, but it seems odd.
>
> diff --git a/fs/ext4/super.c b/fs/ext4/super.c
> index 58987b5..e7b345d 100644
> --- a/fs/ext4/super.c
> +++ b/fs/ext4/super.c
> @@ -4833,10 +4833,11 @@ static int ext4_freeze(struct super_block *sb)
> error = jbd2_journal_flush(journal);
> if (error < 0)
> goto out;
> +
> + /* Journal blocked and flushed, clear needs_recovery flag. */
> + EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
> }
>
> - /* Journal blocked and flushed, clear needs_recovery flag. */
> - EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
> error = ext4_commit_super(sb, 1);
> out:
> if (journal)
> @@ -4854,8 +4855,11 @@ static int ext4_unfreeze(struct super_block *sb)
> if (sb->s_flags & MS_RDONLY)
> return 0;
>
> - /* Reset the needs_recovery flag before the fs is unlocked. */
> - EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
> + if (EXT4_SB(sb)->s_journal) {
> + /* Reset the needs_recovery flag before the fs is unlocked. */
> + EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
> + }
> +
> ext4_commit_super(sb, 1);
> return 0;
> }
>
> --
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