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authorTrond Myklebust <trond.myklebust@primarydata.com>2017-05-09 19:47:15 (GMT)
committerTrond Myklebust <trond.myklebust@primarydata.com>2017-05-09 19:52:15 (GMT)
commitf4b23de3dda1536590787c9e5c3d16b8738ab108 (patch)
tree88f2667df7691ca6298f74b1976182b48053b105
parente092693443b995c8e3a565a73b5fdb05f1260f9b (diff)
downloadlinux-f4b23de3dda1536590787c9e5c3d16b8738ab108.tar.gz
linux-f4b23de3dda1536590787c9e5c3d16b8738ab108.tar.xz
NFSv4.1: Work around a Linux server bug...
It turns out the Linux server has a bug in its implementation of supattr_exclcreat; it returns the set of all attributes, whether or not they are supported by minor version 1. In order to avoid a regression, we therefore apply the supported_attrs as a mask on top of whatever the server sent us. Reported-by: Anna Schumaker <Anna.Schumaker@Netapp.com> Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
-rw-r--r--fs/nfs/nfs4proc.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index f48dfb7..c08c46a 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -3268,6 +3268,7 @@ static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *f
.rpc_resp = &res,
};
int status;
+ int i;
bitmask[0] = FATTR4_WORD0_SUPPORTED_ATTRS |
FATTR4_WORD0_FH_EXPIRE_TYPE |
@@ -3333,8 +3334,13 @@ static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *f
server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
server->cache_consistency_bitmask[2] = 0;
+
+ /* Avoid a regression due to buggy server */
+ for (i = 0; i < ARRAY_SIZE(res.exclcreat_bitmask); i++)
+ res.exclcreat_bitmask[i] &= res.attr_bitmask[i];
memcpy(server->exclcreat_bitmask, res.exclcreat_bitmask,
sizeof(server->exclcreat_bitmask));
+
server->acl_bitmask = res.acl_bitmask;
server->fh_expire_type = res.fh_expire_type;
}