[PATCH v2 15/19] NFSv4: Detect support for OPEN4_SHARE_ACCESS_WANT_OPEN_XOR_DELEGATION

trondmy
2024-06-17T01:25:15Z

If the server supports the NFSv4.2 protocol extension to optimise away
returning a stateid when it returns a delegation, then we cache that
information in another capability flag.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Signed-off-by: Lance Shelton <lance.shelton@hammerspace.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
---
fs/nfs/nfs4proc.c | 4 ++++
include/linux/nfs_fs_sb.h | 1 +
include/uapi/linux/nfs4.h | 2 ++
3 files changed, 7 insertions(+)

diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index ae91492e9521..adf4fc8610f6 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -3990,6 +3990,10 @@ static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *f
sizeof(server->attr_bitmask));
server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL;

+ if (res.open_caps.oa_share_access_want[0] &
+ NFS4_SHARE_WANT_OPEN_XOR_DELEGATION)
+ server->caps |= NFS_CAP_OPEN_XOR;
+
memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
diff --git a/include/linux/nfs_fs_sb.h b/include/linux/nfs_fs_sb.h
index 5a76a87cd924..fe5b1a8bd723 100644
--- a/include/linux/nfs_fs_sb.h
+++ b/include/linux/nfs_fs_sb.h
@@ -278,6 +278,7 @@ struct nfs_server {
#define NFS_CAP_LGOPEN (1U << 5)
#define NFS_CAP_CASE_INSENSITIVE (1U << 6)
#define NFS_CAP_CASE_PRESERVING (1U << 7)
+#define NFS_CAP_OPEN_XOR (1U << 12)
#define NFS_CAP_DELEGTIME (1U << 13)
#define NFS_CAP_POSIX_LOCK (1U << 14)
#define NFS_CAP_UIDGID_NOMAP (1U << 15)
diff --git a/include/uapi/linux/nfs4.h b/include/uapi/linux/nfs4.h
index afd7e32906c3..caf4db2fcbb9 100644
--- a/include/uapi/linux/nfs4.h
+++ b/include/uapi/linux/nfs4.h
@@ -46,6 +46,7 @@
#define NFS4_OPEN_RESULT_CONFIRM 0x0002
#define NFS4_OPEN_RESULT_LOCKTYPE_POSIX 0x0004
#define NFS4_OPEN_RESULT_PRESERVE_UNLINKED 0x0008
+#define NFS4_OPEN_RESULT_NO_OPEN_STATEID 0x0010
#define NFS4_OPEN_RESULT_MAY_NOTIFY_LOCK 0x0020

#define NFS4_SHARE_ACCESS_MASK 0x000F
@@ -70,6 +71,7 @@
#define NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED 0x20000

#define NFS4_SHARE_WANT_DELEG_TIMESTAMPS 0x100000
+#define NFS4_SHARE_WANT_OPEN_XOR_DELEGATION 0x200000

#define NFS4_CDFC4_FORE 0x1
#define NFS4_CDFC4_BACK 0x2
--
2.45.2