NFSv4: Always use the delegation if we have one
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 61ba32a..128fe23 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -319,7 +319,7 @@
return ret;
}
-static inline void update_open_stateflags(struct nfs4_state *state, mode_t open_flags)
+static void update_open_stateflags(struct nfs4_state *state, mode_t open_flags)
{
switch (open_flags) {
case FMODE_WRITE:
@@ -331,9 +331,36 @@
case FMODE_READ|FMODE_WRITE:
state->n_rdwr++;
}
+ nfs4_state_set_mode_locked(state, state->state | open_flags);
}
-static void update_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags)
+static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags)
+{
+ if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
+ memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data));
+ memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data));
+ switch (open_flags) {
+ case FMODE_READ:
+ set_bit(NFS_O_RDONLY_STATE, &state->flags);
+ break;
+ case FMODE_WRITE:
+ set_bit(NFS_O_WRONLY_STATE, &state->flags);
+ break;
+ case FMODE_READ|FMODE_WRITE:
+ set_bit(NFS_O_RDWR_STATE, &state->flags);
+ }
+}
+
+static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags)
+{
+ spin_lock(&state->owner->so_lock);
+ spin_lock(&state->inode->i_lock);
+ nfs_set_open_stateid_locked(state, stateid, open_flags);
+ spin_unlock(&state->inode->i_lock);
+ spin_unlock(&state->owner->so_lock);
+}
+
+static void update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *deleg_stateid, int open_flags)
{
struct inode *inode = state->inode;
@@ -341,9 +368,13 @@
/* Protect against nfs4_find_state_byowner() */
spin_lock(&state->owner->so_lock);
spin_lock(&inode->i_lock);
- memcpy(&state->stateid, stateid, sizeof(state->stateid));
+ if (deleg_stateid != NULL) {
+ memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data));
+ set_bit(NFS_DELEGATED_STATE, &state->flags);
+ }
+ if (open_stateid != NULL)
+ nfs_set_open_stateid_locked(state, open_stateid, open_flags);
update_open_stateflags(state, open_flags);
- nfs4_state_set_mode_locked(state, state->state | open_flags);
spin_unlock(&inode->i_lock);
spin_unlock(&state->owner->so_lock);
}
@@ -352,6 +383,8 @@
{
struct inode *inode;
struct nfs4_state *state = NULL;
+ struct nfs_delegation *delegation;
+ nfs4_stateid *deleg_stateid = NULL;
if (!(data->f_attr.valid & NFS_ATTR_FATTR))
goto out;
@@ -361,13 +394,14 @@
state = nfs4_get_open_state(inode, data->owner);
if (state == NULL)
goto put_inode;
- update_open_stateid(state, &data->o_res.stateid, data->o_arg.open_flags);
if (data->o_res.delegation_type != 0) {
- struct nfs_inode *nfsi = NFS_I(inode);
int delegation_flags = 0;
- if (nfsi->delegation)
- delegation_flags = nfsi->delegation->flags;
+ rcu_read_lock();
+ delegation = rcu_dereference(NFS_I(inode)->delegation);
+ if (delegation)
+ delegation_flags = delegation->flags;
+ rcu_read_unlock();
if (!(delegation_flags & NFS_DELEGATION_NEED_RECLAIM))
nfs_inode_set_delegation(state->inode,
data->owner->so_cred,
@@ -377,6 +411,12 @@
data->owner->so_cred,
&data->o_res);
}
+ rcu_read_lock();
+ delegation = rcu_dereference(NFS_I(inode)->delegation);
+ if (delegation != NULL)
+ deleg_stateid = &delegation->stateid;
+ update_open_stateid(state, &data->o_res.stateid, deleg_stateid, data->o_arg.open_flags);
+ rcu_read_unlock();
put_inode:
iput(inode);
out:
@@ -911,8 +951,7 @@
unlock_kernel();
if (err != 0)
goto out_put_open_state;
- set_bit(NFS_DELEGATED_STATE, &state->flags);
- update_open_stateid(state, &delegation->stateid, open_flags);
+ update_open_stateid(state, NULL, &delegation->stateid, open_flags);
out_ok:
nfs4_put_state_owner(sp);
up_read(&nfsi->rwsem);
@@ -1149,8 +1188,7 @@
nfs_increment_open_seqid(task->tk_status, calldata->arg.seqid);
switch (task->tk_status) {
case 0:
- memcpy(&state->stateid, &calldata->res.stateid,
- sizeof(state->stateid));
+ nfs_set_open_stateid(state, &calldata->res.stateid, calldata->arg.open_flags);
renew_lease(server, calldata->timestamp);
break;
case -NFS4ERR_STALE_STATEID:
@@ -1175,26 +1213,32 @@
.rpc_resp = &calldata->res,
.rpc_cred = state->owner->so_cred,
};
- int mode = 0, old_mode;
+ int clear_rd, clear_wr, clear_rdwr;
+ int mode;
if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
return;
- /* Recalculate the new open mode in case someone reopened the file
- * while we were waiting in line to be scheduled.
- */
+
+ mode = FMODE_READ|FMODE_WRITE;
+ clear_rd = clear_wr = clear_rdwr = 0;
spin_lock(&state->owner->so_lock);
spin_lock(&calldata->inode->i_lock);
- mode = old_mode = state->state;
+ /* Calculate the change in open mode */
if (state->n_rdwr == 0) {
- if (state->n_rdonly == 0)
+ if (state->n_rdonly == 0) {
mode &= ~FMODE_READ;
- if (state->n_wronly == 0)
+ clear_rd |= test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags);
+ clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
+ }
+ if (state->n_wronly == 0) {
mode &= ~FMODE_WRITE;
+ clear_wr |= test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags);
+ clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
+ }
}
- nfs4_state_set_mode_locked(state, mode);
spin_unlock(&calldata->inode->i_lock);
spin_unlock(&state->owner->so_lock);
- if (mode == old_mode || test_bit(NFS_DELEGATED_STATE, &state->flags)) {
+ if (!clear_rd && !clear_wr && !clear_rdwr) {
/* Note: exit _without_ calling nfs4_close_done */
task->tk_action = NULL;
return;
@@ -1238,7 +1282,7 @@
calldata->inode = state->inode;
calldata->state = state;
calldata->arg.fh = NFS_FH(state->inode);
- calldata->arg.stateid = &state->stateid;
+ calldata->arg.stateid = &state->open_stateid;
/* Serialization for the sequence id */
calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid);
if (calldata->arg.seqid == NULL)