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

[Qu Wenruo <wqu@suse.com>]

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.

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