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

[Nikolay Borisov <nborisov@suse.com>]

On 10.04.19 г. 18:11 ч., 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?
> 
> #define EFSBADCRC   EBADMSG

No we don't but I think we ought to start since this is more precise
than simple -EUCLEAN. So I agree with your suggestion

> 
> --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
>>
>