*/
#include <linux/nfs4.h>
#include <linux/nfs_fs.h>
+#include <linux/slab.h>
#include "nfs4_fs.h"
#include "callback.h"
#include "delegation.h"
out_putclient:
nfs_put_client(clp);
out:
- dprintk("%s: exit with status = %d\n", __FUNCTION__, ntohl(res->status));
+ dprintk("%s: exit with status = %d\n", __func__, ntohl(res->status));
return res->status;
}
+static int (*nfs_validate_delegation_stateid(struct nfs_client *clp))(struct nfs_delegation *, const nfs4_stateid *)
+{
+#if defined(CONFIG_NFS_V4_1)
+ if (clp->cl_minorversion > 0)
+ return nfs41_validate_delegation_stateid;
+#endif
+ return nfs4_validate_delegation_stateid;
+}
+
+
__be32 nfs4_callback_recall(struct cb_recallargs *args, void *dummy)
{
struct nfs_client *clp;
dprintk("NFS: RECALL callback request from %s\n",
rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR));
- inode = nfs_delegation_find_inode(clp, &args->fh);
- if (inode == NULL)
+ do {
+ struct nfs_client *prev = clp;
+
+ inode = nfs_delegation_find_inode(clp, &args->fh);
+ if (inode != NULL) {
+ /* Set up a helper thread to actually return the delegation */
+ switch (nfs_async_inode_return_delegation(inode, &args->stateid,
+ nfs_validate_delegation_stateid(clp))) {
+ case 0:
+ res = 0;
+ break;
+ case -ENOENT:
+ if (res != 0)
+ res = htonl(NFS4ERR_BAD_STATEID);
+ break;
+ default:
+ res = htonl(NFS4ERR_RESOURCE);
+ }
+ iput(inode);
+ }
+ clp = nfs_find_client_next(prev);
+ nfs_put_client(prev);
+ } while (clp != NULL);
+out:
+ dprintk("%s: exit with status = %d\n", __func__, ntohl(res));
+ return res;
+}
+
+int nfs4_validate_delegation_stateid(struct nfs_delegation *delegation, const nfs4_stateid *stateid)
+{
+ if (delegation == NULL || memcmp(delegation->stateid.data, stateid->data,
+ sizeof(delegation->stateid.data)) != 0)
+ return 0;
+ return 1;
+}
+
+#if defined(CONFIG_NFS_V4_1)
+
+int nfs41_validate_delegation_stateid(struct nfs_delegation *delegation, const nfs4_stateid *stateid)
+{
+ if (delegation == NULL)
+ return 0;
+
+ /* seqid is 4-bytes long */
+ if (((u32 *) &stateid->data)[0] != 0)
+ return 0;
+ if (memcmp(&delegation->stateid.data[4], &stateid->data[4],
+ sizeof(stateid->data)-4))
+ return 0;
+
+ return 1;
+}
+
+/*
+ * Validate the sequenceID sent by the server.
+ * Return success if the sequenceID is one more than what we last saw on
+ * this slot, accounting for wraparound. Increments the slot's sequence.
+ *
+ * We don't yet implement a duplicate request cache, instead we set the
+ * back channel ca_maxresponsesize_cached to zero. This is OK for now
+ * since we only currently implement idempotent callbacks anyway.
+ *
+ * We have a single slot backchannel at this time, so we don't bother
+ * checking the used_slots bit array on the table. The lower layer guarantees
+ * a single outstanding callback request at a time.
+ */
+static __be32
+validate_seqid(struct nfs4_slot_table *tbl, struct cb_sequenceargs * args)
+{
+ struct nfs4_slot *slot;
+
+ dprintk("%s enter. slotid %d seqid %d\n",
+ __func__, args->csa_slotid, args->csa_sequenceid);
+
+ if (args->csa_slotid > NFS41_BC_MAX_CALLBACKS)
+ return htonl(NFS4ERR_BADSLOT);
+
+ slot = tbl->slots + args->csa_slotid;
+ dprintk("%s slot table seqid: %d\n", __func__, slot->seq_nr);
+
+ /* Normal */
+ if (likely(args->csa_sequenceid == slot->seq_nr + 1)) {
+ slot->seq_nr++;
+ return htonl(NFS4_OK);
+ }
+
+ /* Replay */
+ if (args->csa_sequenceid == slot->seq_nr) {
+ dprintk("%s seqid %d is a replay\n",
+ __func__, args->csa_sequenceid);
+ /* 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);
+ }
+
+ /* Wraparound */
+ if (args->csa_sequenceid == 1 && (slot->seq_nr + 1) == 0) {
+ slot->seq_nr = 1;
+ return htonl(NFS4_OK);
+ }
+
+ /* Misordered request */
+ return htonl(NFS4ERR_SEQ_MISORDERED);
+}
+
+/*
+ * Returns a pointer to a held 'struct nfs_client' that matches the server's
+ * address, major version number, and session ID. It is the caller's
+ * responsibility to release the returned reference.
+ *
+ * Returns NULL if there are no connections with sessions, or if no session
+ * matches the one of interest.
+ */
+ static struct nfs_client *find_client_with_session(
+ const struct sockaddr *addr, u32 nfsversion,
+ struct nfs4_sessionid *sessionid)
+{
+ struct nfs_client *clp;
+
+ clp = nfs_find_client(addr, 4);
+ if (clp == NULL)
+ return NULL;
+
+ do {
+ struct nfs_client *prev = clp;
+
+ if (clp->cl_session != NULL) {
+ if (memcmp(clp->cl_session->sess_id.data,
+ sessionid->data,
+ NFS4_MAX_SESSIONID_LEN) == 0) {
+ /* Returns a held reference to clp */
+ return clp;
+ }
+ }
+ clp = nfs_find_client_next(prev);
+ nfs_put_client(prev);
+ } while (clp != NULL);
+
+ return NULL;
+}
+
+/*
+ * For each referring call triple, check the session's slot table for
+ * a match. If the slot is in use and the sequence numbers match, the
+ * client is still waiting for a response to the original request.
+ */
+static bool referring_call_exists(struct nfs_client *clp,
+ uint32_t nrclists,
+ struct referring_call_list *rclists)
+{
+ bool status = 0;
+ int i, j;
+ struct nfs4_session *session;
+ struct nfs4_slot_table *tbl;
+ struct referring_call_list *rclist;
+ struct referring_call *ref;
+
+ /*
+ * XXX When client trunking is implemented, this becomes
+ * a session lookup from within the loop
+ */
+ session = clp->cl_session;
+ tbl = &session->fc_slot_table;
+
+ for (i = 0; i < nrclists; i++) {
+ rclist = &rclists[i];
+ if (memcmp(session->sess_id.data,
+ rclist->rcl_sessionid.data,
+ NFS4_MAX_SESSIONID_LEN) != 0)
+ continue;
+
+ for (j = 0; j < rclist->rcl_nrefcalls; j++) {
+ ref = &rclist->rcl_refcalls[j];
+
+ dprintk("%s: sessionid %x:%x:%x:%x sequenceid %u "
+ "slotid %u\n", __func__,
+ ((u32 *)&rclist->rcl_sessionid.data)[0],
+ ((u32 *)&rclist->rcl_sessionid.data)[1],
+ ((u32 *)&rclist->rcl_sessionid.data)[2],
+ ((u32 *)&rclist->rcl_sessionid.data)[3],
+ ref->rc_sequenceid, ref->rc_slotid);
+
+ spin_lock(&tbl->slot_tbl_lock);
+ status = (test_bit(ref->rc_slotid, tbl->used_slots) &&
+ tbl->slots[ref->rc_slotid].seq_nr ==
+ ref->rc_sequenceid);
+ spin_unlock(&tbl->slot_tbl_lock);
+ if (status)
+ goto out;
+ }
+ }
+
+out:
+ return status;
+}
+
+__be32 nfs4_callback_sequence(struct cb_sequenceargs *args,
+ struct cb_sequenceres *res)
+{
+ struct nfs_client *clp;
+ int i;
+ __be32 status;
+
+ status = htonl(NFS4ERR_BADSESSION);
+ clp = find_client_with_session(args->csa_addr, 4, &args->csa_sessionid);
+ if (clp == NULL)
+ goto out;
+
+ status = validate_seqid(&clp->cl_session->bc_slot_table, args);
+ if (status)
+ goto out_putclient;
+
+ /*
+ * Check for pending referring calls. If a match is found, a
+ * related callback was received before the response to the original
+ * call.
+ */
+ if (referring_call_exists(clp, args->csa_nrclists, args->csa_rclists)) {
+ status = htonl(NFS4ERR_DELAY);
goto out_putclient;
- /* Set up a helper thread to actually return the delegation */
- switch(nfs_async_inode_return_delegation(inode, &args->stateid)) {
- case 0:
- res = 0;
- break;
- case -ENOENT:
- res = htonl(NFS4ERR_BAD_STATEID);
- break;
- default:
- res = htonl(NFS4ERR_RESOURCE);
}
- iput(inode);
+
+ 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;
+
out_putclient:
nfs_put_client(clp);
out:
- dprintk("%s: exit with status = %d\n", __FUNCTION__, ntohl(res));
- return res;
+ for (i = 0; i < args->csa_nrclists; i++)
+ kfree(args->csa_rclists[i].rcl_refcalls);
+ kfree(args->csa_rclists);
+
+ if (status == htonl(NFS4ERR_RETRY_UNCACHED_REP))
+ res->csr_status = 0;
+ else
+ res->csr_status = status;
+ dprintk("%s: exit with status = %d res->csr_status %d\n", __func__,
+ ntohl(status), ntohl(res->csr_status));
+ return status;
+}
+
+__be32 nfs4_callback_recallany(struct cb_recallanyargs *args, void *dummy)
+{
+ struct nfs_client *clp;
+ __be32 status;
+ fmode_t flags = 0;
+
+ status = htonl(NFS4ERR_OP_NOT_IN_SESSION);
+ clp = nfs_find_client(args->craa_addr, 4);
+ if (clp == NULL)
+ goto out;
+
+ dprintk("NFS: RECALL_ANY callback request from %s\n",
+ rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR));
+
+ if (test_bit(RCA4_TYPE_MASK_RDATA_DLG, (const unsigned long *)
+ &args->craa_type_mask))
+ flags = FMODE_READ;
+ if (test_bit(RCA4_TYPE_MASK_WDATA_DLG, (const unsigned long *)
+ &args->craa_type_mask))
+ flags |= FMODE_WRITE;
+
+ if (flags)
+ nfs_expire_all_delegation_types(clp, flags);
+ status = htonl(NFS4_OK);
+out:
+ dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
+ return status;
+}
+
+/* Reduce the fore channel's max_slots to the target value */
+__be32 nfs4_callback_recallslot(struct cb_recallslotargs *args, void *dummy)
+{
+ struct nfs_client *clp;
+ struct nfs4_slot_table *fc_tbl;
+ __be32 status;
+
+ status = htonl(NFS4ERR_OP_NOT_IN_SESSION);
+ clp = nfs_find_client(args->crsa_addr, 4);
+ if (clp == NULL)
+ goto out;
+
+ dprintk("NFS: CB_RECALL_SLOT request from %s target max slots %d\n",
+ rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR),
+ args->crsa_target_max_slots);
+
+ fc_tbl = &clp->cl_session->fc_slot_table;
+
+ status = htonl(NFS4ERR_BAD_HIGH_SLOT);
+ if (args->crsa_target_max_slots > fc_tbl->max_slots ||
+ args->crsa_target_max_slots < 1)
+ goto out_putclient;
+
+ status = htonl(NFS4_OK);
+ if (args->crsa_target_max_slots == fc_tbl->max_slots)
+ goto out_putclient;
+
+ fc_tbl->target_max_slots = args->crsa_target_max_slots;
+ nfs41_handle_recall_slot(clp);
+out_putclient:
+ nfs_put_client(clp); /* balance nfs_find_client */
+out:
+ dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
+ return status;
}
+#endif /* CONFIG_NFS_V4_1 */
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff