Re: [PATCH RFC 1/2] errno.h: Export EFSCORRUPTED error number

["Darrick J. Wong" <darrick.wong@oracle.com>]

On Thu, Apr 11, 2019 at 09:43:05AM +0800, Qu Wenruo wrote:
> 
> 
> On 2019/4/11 上午9:06, Darrick J. Wong wrote:
> > On Thu, Apr 11, 2019 at 08:28:44AM +0800, Qu Wenruo wrote:
> >>
> >>
> >> On 2019/4/10 下午11:11,  Darrick J. Wong  wrote:
> >>> On Wed, Apr 10, 2019 at 04:35:07PM +0800, Qu Wenruo wrote:
> >>>> Xfs and Ext* uses EFSCORRUPTED to indicate filesystem corruption.
> >>>> They both map EFSCORRUPTED to EUCLEAN.
> >>>>
> >>>> Btrfs/Ubifs/fscrypto all use EUCLEAN directly to indicate filesystem
> >>>> corruption.
> >>>
> >>> I don't know if you (btrfs folks specifically) care but ext* and xfs
> >>> also use EFSBADCRC to signal unrecovered checksum validation failures.
> >>> Can we promote both of them to asm-generic/errno.h at the same time?
> >>
> >> It looks pretty good to me in fact.
> >>
> >> I'm really tired of using -EIO for csum mismatch/any other higher level
> >> mismatch.
> >>
> >> The only concern is the "CRC" part. Yes, btrfs uses and only supports
> >> CRC32 so far, but I'm sure btrfs will support cryptographic hash.
> >>
> >> So what about renaming it to EFSBADCSUM?
> > 
> > We've been shipping EFSBADCRC in xfslibs-dev userspace libraries for
> > years now, so we can't change the symbol name.
> 
> Fair enough.
> 
> Any extra error number worthy export?

None that I can think of...

--D

> Thanks,
> Qu
> 
> > 
> > --D
> > 
> >> Thanks,
> >> Qu
> >>
> >>>
> >>> #define EFSBADCRC   EBADMSG
> >>>
> >>> --D
> >>>
> >>>> And block layer is going to distinguish filesystem corruption with
> >>>> oridinary EIO error, it's a good idea to export the initial EFSCORRUPTED
> >>>> declaration to <linux/errno.h> so all filesystems and block layer can
> >>>> take advantage of this easier-to-read error number.
> >>>>
> >>>> Signed-off-by: Qu Wenruo <wqu@suse.com>
> >>>> ---
> >>>>  fs/ext2/ext2.h                   | 1 -
> >>>>  fs/ext4/ext4.h                   | 1 -
> >>>>  fs/xfs/xfs_linux.h               | 1 -
> >>>>  include/uapi/asm-generic/errno.h | 3 +++
> >>>>  4 files changed, 3 insertions(+), 3 deletions(-)
> >>>>
> >>>> diff --git a/fs/ext2/ext2.h b/fs/ext2/ext2.h
> >>>> index 10ab238de9a6..03d0ca8fae42 100644
> >>>> --- a/fs/ext2/ext2.h
> >>>> +++ b/fs/ext2/ext2.h
> >>>> @@ -369,7 +369,6 @@ struct ext2_inode {
> >>>>   */
> >>>>  #define	EXT2_VALID_FS			0x0001	/* Unmounted cleanly */
> >>>>  #define	EXT2_ERROR_FS			0x0002	/* Errors detected */
> >>>> -#define	EFSCORRUPTED			EUCLEAN	/* Filesystem is corrupted */
> >>>>  
> >>>>  /*
> >>>>   * Mount flags
> >>>> diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
> >>>> index 82ffdacdc7fa..f906b5cbf96d 100644
> >>>> --- a/fs/ext4/ext4.h
> >>>> +++ b/fs/ext4/ext4.h
> >>>> @@ -3248,6 +3248,5 @@ extern const struct iomap_ops ext4_iomap_ops;
> >>>>  #endif	/* __KERNEL__ */
> >>>>  
> >>>>  #define EFSBADCRC	EBADMSG		/* Bad CRC detected */
> >>>> -#define EFSCORRUPTED	EUCLEAN		/* Filesystem is corrupted */
> >>>>  
> >>>>  #endif	/* _EXT4_H */
> >>>> diff --git a/fs/xfs/xfs_linux.h b/fs/xfs/xfs_linux.h
> >>>> index edbd5a210df2..36e5c6549f15 100644
> >>>> --- a/fs/xfs/xfs_linux.h
> >>>> +++ b/fs/xfs/xfs_linux.h
> >>>> @@ -125,7 +125,6 @@ typedef __u32			xfs_nlink_t;
> >>>>  
> >>>>  #define ENOATTR		ENODATA		/* Attribute not found */
> >>>>  #define EWRONGFS	EINVAL		/* Mount with wrong filesystem type */
> >>>> -#define EFSCORRUPTED	EUCLEAN		/* Filesystem is corrupted */
> >>>>  #define EFSBADCRC	EBADMSG		/* Bad CRC detected */
> >>>>  
> >>>>  #define SYNCHRONIZE()	barrier()
> >>>> diff --git a/include/uapi/asm-generic/errno.h b/include/uapi/asm-generic/errno.h
> >>>> index cf9c51ac49f9..ebd6e7e76a98 100644
> >>>> --- a/include/uapi/asm-generic/errno.h
> >>>> +++ b/include/uapi/asm-generic/errno.h
> >>>> @@ -98,6 +98,9 @@
> >>>>  #define	EINPROGRESS	115	/* Operation now in progress */
> >>>>  #define	ESTALE		116	/* Stale file handle */
> >>>>  #define	EUCLEAN		117	/* Structure needs cleaning */
> >>>> +
> >>>> +#define EFSCORRUPTED	EUCLEAN	/* Filesystem is corrupted */
> >>>> +
> >>>>  #define	ENOTNAM		118	/* Not a XENIX named type file */
> >>>>  #define	ENAVAIL		119	/* No XENIX semaphores available */
> >>>>  #define	EISNAM		120	/* Is a named type file */
> >>>> -- 
> >>>> 2.21.0
> >>>>
> >>>
> >>
> > 
> > 
> > 
>