[PATCH 4.14 095/125] NFSv4.2: support EXCHGID4_FLAG_SUPP_FENCE_OPS 4.2 EXCHANGE_ID flag

Greg Kroah-Hartman
2020-11-03T21:12:25Z

From: Olga Kornievskaia <kolga@netapp.com>

commit 8c39076c276be0b31982e44654e2c2357473258a upstream.

RFC 7862 introduced a new flag that either client or server is
allowed to set: EXCHGID4_FLAG_SUPP_FENCE_OPS.

Client needs to update its bitmask to allow for this flag value.

v2: changed minor version argument to unsigned int

Signed-off-by: Olga Kornievskaia <kolga@netapp.com>
CC: <stable@vger.kernel.org>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
fs/nfs/nfs4proc.c | 9 ++++++---
include/uapi/linux/nfs4.h | 3 +++
2 files changed, 9 insertions(+), 3 deletions(-)

--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -7283,9 +7283,11 @@ int nfs4_proc_secinfo(struct inode *dir,
* both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
* DS flags set.
*/
-static int nfs4_check_cl_exchange_flags(u32 flags)
+static int nfs4_check_cl_exchange_flags(u32 flags, u32 version)
{
- if (flags & ~EXCHGID4_FLAG_MASK_R)
+ if (version >= 2 && (flags & ~EXCHGID4_2_FLAG_MASK_R))
+ goto out_inval;
+ else if (version < 2 && (flags & ~EXCHGID4_FLAG_MASK_R))
goto out_inval;
if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
(flags & EXCHGID4_FLAG_USE_NON_PNFS))
@@ -7680,7 +7682,8 @@ static int _nfs4_proc_exchange_id(struct
if (status != 0)
goto out;

- status = nfs4_check_cl_exchange_flags(resp->flags);
+ status = nfs4_check_cl_exchange_flags(resp->flags,
+ clp->cl_mvops->minor_version);
if (status != 0)
goto out;

--- a/include/uapi/linux/nfs4.h
+++ b/include/uapi/linux/nfs4.h
@@ -136,6 +136,8 @@

#define EXCHGID4_FLAG_UPD_CONFIRMED_REC_A 0x40000000
#define EXCHGID4_FLAG_CONFIRMED_R 0x80000000
+
+#define EXCHGID4_FLAG_SUPP_FENCE_OPS 0x00000004
/*
* Since the validity of these bits depends on whether
* they're set in the argument or response, have separate
@@ -143,6 +145,7 @@
*/
#define EXCHGID4_FLAG_MASK_A 0x40070103
#define EXCHGID4_FLAG_MASK_R 0x80070103
+#define EXCHGID4_2_FLAG_MASK_R 0x80070107

#define SEQ4_STATUS_CB_PATH_DOWN 0x00000001
#define SEQ4_STATUS_CB_GSS_CONTEXTS_EXPIRING 0x00000002