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Diffstat (limited to 'fs/nfs/callback_proc.c')
-rw-r--r--fs/nfs/callback_proc.c71
1 files changed, 39 insertions, 32 deletions
diff --git a/fs/nfs/callback_proc.c b/fs/nfs/callback_proc.c
index f0939d097..7c9fbf504 100644
--- a/fs/nfs/callback_proc.c
+++ b/fs/nfs/callback_proc.c
@@ -354,47 +354,38 @@ out:
* a single outstanding callback request at a time.
*/
static __be32
-validate_seqid(struct nfs4_slot_table *tbl, struct cb_sequenceargs * args)
+validate_seqid(const struct nfs4_slot_table *tbl, const struct nfs4_slot *slot,
+ const struct cb_sequenceargs * args)
{
- struct nfs4_slot *slot;
-
- dprintk("%s enter. slotid %u seqid %u\n",
- __func__, args->csa_slotid, args->csa_sequenceid);
+ dprintk("%s enter. slotid %u seqid %u, slot table seqid: %u\n",
+ __func__, args->csa_slotid, args->csa_sequenceid, slot->seq_nr);
- if (args->csa_slotid >= NFS41_BC_MAX_CALLBACKS)
+ if (args->csa_slotid > tbl->server_highest_slotid)
return htonl(NFS4ERR_BADSLOT);
- slot = tbl->slots + args->csa_slotid;
- dprintk("%s slot table seqid: %u\n", __func__, slot->seq_nr);
-
- /* Normal */
- if (likely(args->csa_sequenceid == slot->seq_nr + 1))
- goto out_ok;
-
/* Replay */
if (args->csa_sequenceid == slot->seq_nr) {
dprintk("%s seqid %u is a replay\n",
__func__, args->csa_sequenceid);
+ if (nfs4_test_locked_slot(tbl, slot->slot_nr))
+ return htonl(NFS4ERR_DELAY);
/* Signal process_op to set this error on next op */
if (args->csa_cachethis == 0)
return htonl(NFS4ERR_RETRY_UNCACHED_REP);
- /* The ca_maxresponsesize_cached is 0 with no DRC */
- else if (args->csa_cachethis == 1)
- return htonl(NFS4ERR_REP_TOO_BIG_TO_CACHE);
+ /* Liar! We never allowed you to set csa_cachethis != 0 */
+ return htonl(NFS4ERR_SEQ_FALSE_RETRY);
}
/* Wraparound */
- if (args->csa_sequenceid == 1 && (slot->seq_nr + 1) == 0) {
- slot->seq_nr = 1;
- goto out_ok;
- }
+ if (unlikely(slot->seq_nr == 0xFFFFFFFFU)) {
+ if (args->csa_sequenceid == 1)
+ return htonl(NFS4_OK);
+ } else if (likely(args->csa_sequenceid == slot->seq_nr + 1))
+ return htonl(NFS4_OK);
/* Misordered request */
return htonl(NFS4ERR_SEQ_MISORDERED);
-out_ok:
- tbl->highest_used_slotid = args->csa_slotid;
- return htonl(NFS4_OK);
}
/*
@@ -473,6 +464,12 @@ __be32 nfs4_callback_sequence(struct cb_sequenceargs *args,
tbl = &clp->cl_session->bc_slot_table;
slot = tbl->slots + args->csa_slotid;
+ /* Set up res before grabbing the spinlock */
+ memcpy(&res->csr_sessionid, &args->csa_sessionid,
+ sizeof(res->csr_sessionid));
+ res->csr_sequenceid = args->csa_sequenceid;
+ res->csr_slotid = args->csa_slotid;
+
spin_lock(&tbl->slot_tbl_lock);
/* state manager is resetting the session */
if (test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state)) {
@@ -485,18 +482,28 @@ __be32 nfs4_callback_sequence(struct cb_sequenceargs *args,
goto out_unlock;
}
- memcpy(&res->csr_sessionid, &args->csa_sessionid,
- sizeof(res->csr_sessionid));
- res->csr_sequenceid = args->csa_sequenceid;
- res->csr_slotid = args->csa_slotid;
- res->csr_highestslotid = NFS41_BC_MAX_CALLBACKS - 1;
- res->csr_target_highestslotid = NFS41_BC_MAX_CALLBACKS - 1;
+ status = htonl(NFS4ERR_BADSLOT);
+ slot = nfs4_lookup_slot(tbl, args->csa_slotid);
+ if (IS_ERR(slot))
+ goto out_unlock;
+
+ res->csr_highestslotid = tbl->server_highest_slotid;
+ res->csr_target_highestslotid = tbl->target_highest_slotid;
- status = validate_seqid(tbl, args);
+ status = validate_seqid(tbl, slot, args);
if (status)
goto out_unlock;
+ if (!nfs4_try_to_lock_slot(tbl, slot)) {
+ status = htonl(NFS4ERR_DELAY);
+ goto out_unlock;
+ }
+ cps->slot = slot;
- cps->slotid = args->csa_slotid;
+ /* The ca_maxresponsesize_cached is 0 with no DRC */
+ if (args->csa_cachethis != 0) {
+ status = htonl(NFS4ERR_REP_TOO_BIG_TO_CACHE);
+ goto out_unlock;
+ }
/*
* Check for pending referring calls. If a match is found, a
@@ -513,7 +520,7 @@ __be32 nfs4_callback_sequence(struct cb_sequenceargs *args,
* If CB_SEQUENCE returns an error, then the state of the slot
* (sequence ID, cached reply) MUST NOT change.
*/
- slot->seq_nr++;
+ slot->seq_nr = args->csa_sequenceid;
out_unlock:
spin_unlock(&tbl->slot_tbl_lock);