linux-kernel - [PATCH] jfs: use time64

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Message-Id: <20180619155110.3950450-1-arnd@arndb.de>
Date:   Tue, 19 Jun 2018 17:51:02 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Dave Kleikamp <shaggy@...nel.org>
Cc:     y2038@...ts.linaro.org, Arnd Bergmann <arnd@...db.de>,
        jfs-discussion@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: [PATCH] jfs: use time64_t for otime

The file creation time in the inode uses time_t which is defined differently
on 32-bit and 64-bit architectures and deprecated. The representation in
the inode uses an unsigned 32-bit number, but this gets wrapped around
after year 2038 when assigned to a time_t.

This changes the type to time64_t, so we can support the full range of
timestamps between 1970 and 2106 on 32-bit systems like we do on 64-bit
systems already, and matching what we do for the atime/ctime/mtime stamps
since the introduction of 64-bit timestamps in VFS.

Note: the otime stamp is not actually used anywhere at the moment in
the kernel, it is just set when writing a file, so none of this really
makes a difference unless we implement setting the btime field in the
getattr() callback.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 fs/jfs/jfs_incore.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/jfs/jfs_incore.h b/fs/jfs/jfs_incore.h
index 1f26d1910409..d5c46f86b2ef 100644
--- a/fs/jfs/jfs_incore.h
+++ b/fs/jfs/jfs_incore.h
@@ -43,7 +43,7 @@ struct jfs_inode_info {
 	pxd_t	ixpxd;		/* inode extent descriptor	*/
 	dxd_t	acl;		/* dxd describing acl	*/
 	dxd_t	ea;		/* dxd describing ea	*/
-	time_t	otime;		/* time created	*/
+	time64_t otime;		/* time created	*/
 	uint	next_index;	/* next available directory entry index */
 	int	acltype;	/* Type of ACL	*/
 	short	btorder;	/* access order	*/
-- 
2.9.0