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NFSv4: Use the open stateid if the delegation has the wrong mode

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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>
This commit is contained in:
Trond Myklebust 2013-04-20 01:25:45 -04:00
parent 042ad0b398
commit 92b40e9384
3 changed files with 7 additions and 1 deletions
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1
fs/nfs/nfs4_fs.h
View file

@ -144,6 +144,7 @@ struct nfs4_lock_state {
enum {
LK_STATE_IN_USE,
NFS_DELEGATED_STATE, /* Current stateid is delegation */
NFS_OPEN_STATE, /* OPEN stateid is set */
NFS_O_RDONLY_STATE, /* OPEN stateid has read-only state */
NFS_O_WRONLY_STATE, /* OPEN stateid has write-only state */
NFS_O_RDWR_STATE, /* OPEN stateid has read/write state */

1
fs/nfs/nfs4proc.c
View file

@ -978,6 +978,7 @@ static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *
if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
nfs4_stateid_copy(&state->stateid, stateid);
nfs4_stateid_copy(&state->open_stateid, stateid);
set_bit(NFS_OPEN_STATE, &state->flags);
switch (fmode) {
case FMODE_READ:
set_bit(NFS_O_RDONLY_STATE, &state->flags);

6
fs/nfs/nfs4state.c
View file

@ -1024,12 +1024,16 @@ static int nfs4_copy_lock_stateid(nfs4_stateid *dst,
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))