linux-kernel - [PATCH v4 1/3] fs: hoist EFSCORRUPTED definition into uapi header

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Message-Id: <20190118161440.220134-1-jannh@google.com>
Date:   Fri, 18 Jan 2019 17:14:38 +0100
From:   Jann Horn <jannh@...gle.com>
To:     Richard Henderson <rth@...ddle.net>,
        Ivan Kokshaysky <ink@...assic.park.msu.ru>,
        Matt Turner <mattst88@...il.com>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        linux-fsdevel@...r.kernel.org, Arnd Bergmann <arnd@...db.de>,
        jannh@...gle.com
Cc:     "Eric W. Biederman" <ebiederm@...ssion.com>,
        "Theodore Ts'o" <tytso@....edu>,
        Andreas Dilger <adilger.kernel@...ger.ca>,
        linux-alpha@...r.kernel.org, linux-kernel@...r.kernel.org,
        Dave Chinner <david@...morbit.com>,
        Pavel Machek <pavel@....cz>, linux-arch@...r.kernel.org,
        linux-api@...r.kernel.org
Subject: [PATCH v4 1/3] fs: hoist EFSCORRUPTED definition into uapi header

Multiple filesystems can already return EFSCORRUPTED errors to userspace;
however, so far, definitions of EFSCORRUPTED were in filesystem-private
headers.

I wanted to use EUCLEAN to indicate data corruption in the VFS layer;
Dave Chinner says that I should instead hoist the definitions of
EFSCORRUPTED into the UAPI header and then use EFSCORRUPTED.

This patch is marked for stable backport because it is a prerequisite for
the following patch.

Cc: stable@...r.kernel.org
Suggested-by: Dave Chinner <david@...morbit.com>
Signed-off-by: Jann Horn <jannh@...gle.com>
---
 fs/ext2/ext2.h                   | 1 -
 fs/ext4/ext4.h                   | 1 -
 fs/xfs/xfs_linux.h               | 1 -
 include/linux/jbd2.h             | 1 -
 include/uapi/asm-generic/errno.h | 1 +
 5 files changed, 1 insertion(+), 4 deletions(-)

diff --git a/fs/ext2/ext2.h b/fs/ext2/ext2.h
index e770cd100a6a..7fafc19e5aa0 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 185a05d3257e..9397e97fc15b 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -3247,6 +3247,5 @@ 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/linux/jbd2.h b/include/linux/jbd2.h
index 0f919d5fe84f..1d0da9c78216 100644
--- a/include/linux/jbd2.h
+++ b/include/linux/jbd2.h
@@ -1640,6 +1640,5 @@ static inline tid_t  jbd2_get_latest_transaction(journal_t *journal)
 #endif	/* __KERNEL__ */
 
 #define EFSBADCRC	EBADMSG		/* Bad CRC detected */
-#define EFSCORRUPTED	EUCLEAN		/* Filesystem is corrupted */
 
 #endif	/* _LINUX_JBD2_H */
diff --git a/include/uapi/asm-generic/errno.h b/include/uapi/asm-generic/errno.h
index cf9c51ac49f9..5ddebc1bf951 100644
--- a/include/uapi/asm-generic/errno.h
+++ b/include/uapi/asm-generic/errno.h
@@ -98,6 +98,7 @@
 #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 */
-- 
2.20.1.321.g9e740568ce-goog