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

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

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?

#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
>