NFSv4: Use the open stateid if the delegation has the wrong mode
Fix nfs4_select_rw_stateid() so that it chooses the open stateid
(or an all-zero stateid) if the delegation does not match the selected
read/write mode.
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/fs/nfs/nfs4state.c b/fs/nfs/nfs4state.c
index 1eb1728..b779695 100644
--- a/fs/nfs/nfs4state.c
+++ b/fs/nfs/nfs4state.c
@@ -1024,12 +1024,16 @@
static int nfs4_copy_open_stateid(nfs4_stateid *dst, struct nfs4_state *state)
{
+ const nfs4_stateid *src;
int ret;
int seq;
do {
+ src = &zero_stateid;
seq = read_seqbegin(&state->seqlock);
- nfs4_stateid_copy(dst, &state->stateid);
+ if (test_bit(NFS_OPEN_STATE, &state->flags))
+ src = &state->open_stateid;
+ nfs4_stateid_copy(dst, src);
ret = 0;
smp_rmb();
if (!list_empty(&state->owner->so_seqid.list))