NFSv4.1: Select the "most recent locking state" for read/write/setattr stateids
Follow the practice described in section 8.2.2 of RFC5661: When sending a
read/write or setattr stateid, set the seqid field to zero in order to
signal that the NFS server should apply the most recent locking state.
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 22c80f9e..625a729e 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -6841,7 +6841,8 @@
.init_caps = NFS_CAP_READDIRPLUS
| NFS_CAP_ATOMIC_OPEN
| NFS_CAP_CHANGE_ATTR
- | NFS_CAP_POSIX_LOCK,
+ | NFS_CAP_POSIX_LOCK
+ | NFS_CAP_STATEID_NFSV41,
.call_sync = nfs4_call_sync_sequence,
.match_stateid = nfs41_match_stateid,
.find_root_sec = nfs41_find_root_sec,
diff --git a/fs/nfs/nfs4state.c b/fs/nfs/nfs4state.c
index 4e95bd7..685b1e9 100644
--- a/fs/nfs/nfs4state.c
+++ b/fs/nfs/nfs4state.c
@@ -1053,6 +1053,8 @@
goto out;
ret = nfs4_copy_open_stateid(dst, state);
out:
+ if (nfs_server_capable(state->inode, NFS_CAP_STATEID_NFSV41))
+ dst->seqid = 0;
return ret;
}
diff --git a/include/linux/nfs_fs_sb.h b/include/linux/nfs_fs_sb.h
index 6c6ed15..74c9e52 100644
--- a/include/linux/nfs_fs_sb.h
+++ b/include/linux/nfs_fs_sb.h
@@ -197,5 +197,6 @@
#define NFS_CAP_MTIME (1U << 13)
#define NFS_CAP_POSIX_LOCK (1U << 14)
#define NFS_CAP_UIDGID_NOMAP (1U << 15)
+#define NFS_CAP_STATEID_NFSV41 (1U << 16)
#endif
