* Patch "Fix cifs_uniqueid_to_ino_t() function for s390x" has been added to the 4.4-stable tree
@ 2016-03-04 1:42 gregkh
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From: gregkh @ 2016-03-04 1:42 UTC (permalink / raw)
To: ydfan, gregkh, smfrench, ydfan; +Cc: stable, stable-commits
This is a note to let you know that I've just added the patch titled
Fix cifs_uniqueid_to_ino_t() function for s390x
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
fix-cifs_uniqueid_to_ino_t-function-for-s390x.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.
>From 1ee9f4bd1a97026a7b2d7ae9f1f74b45680d0003 Mon Sep 17 00:00:00 2001
From: Yadan Fan <ydfan@novell.com>
Date: Mon, 29 Feb 2016 14:44:57 +0800
Subject: Fix cifs_uniqueid_to_ino_t() function for s390x
From: Yadan Fan <ydfan@novell.com>
commit 1ee9f4bd1a97026a7b2d7ae9f1f74b45680d0003 upstream.
This issue is caused by commit 02323db17e3a7 ("cifs: fix
cifs_uniqueid_to_ino_t not to ever return 0"), when BITS_PER_LONG
is 64 on s390x, the corresponding cifs_uniqueid_to_ino_t()
function will cast 64-bit fileid to 32-bit by using (ino_t)fileid,
because ino_t (typdefed __kernel_ino_t) is int type.
It's defined in arch/s390/include/uapi/asm/posix_types.h
#ifndef __s390x__
typedef unsigned long __kernel_ino_t;
...
#else /* __s390x__ */
typedef unsigned int __kernel_ino_t;
So the #ifdef condition is wrong for s390x, we can just still use
one cifs_uniqueid_to_ino_t() function with comparing sizeof(ino_t)
and sizeof(u64) to choose the correct execution accordingly.
Signed-off-by: Yadan Fan <ydfan@suse.com>
Signed-off-by: Steve French <smfrench@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
fs/cifs/cifsfs.h | 12 ++++--------
1 file changed, 4 insertions(+), 8 deletions(-)
--- a/fs/cifs/cifsfs.h
+++ b/fs/cifs/cifsfs.h
@@ -31,19 +31,15 @@
* so that it will fit. We use hash_64 to convert the value to 31 bits, and
* then add 1, to ensure that we don't end up with a 0 as the value.
*/
-#if BITS_PER_LONG == 64
static inline ino_t
cifs_uniqueid_to_ino_t(u64 fileid)
{
+ if ((sizeof(ino_t)) < (sizeof(u64)))
+ return (ino_t)hash_64(fileid, (sizeof(ino_t) * 8) - 1) + 1;
+
return (ino_t)fileid;
+
}
-#else
-static inline ino_t
-cifs_uniqueid_to_ino_t(u64 fileid)
-{
- return (ino_t)hash_64(fileid, (sizeof(ino_t) * 8) - 1) + 1;
-}
-#endif
extern struct file_system_type cifs_fs_type;
extern const struct address_space_operations cifs_addr_ops;
Patches currently in stable-queue which might be from ydfan@novell.com are
queue-4.4/fix-cifs_uniqueid_to_ino_t-function-for-s390x.patch
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2016-03-04 1:42 Patch "Fix cifs_uniqueid_to_ino_t() function for s390x" has been added to the 4.4-stable tree gregkh
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