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Diffstat (limited to 'fs/nfsd/nfs4callback.c')
-rw-r--r--fs/nfsd/nfs4callback.c263
1 files changed, 221 insertions, 42 deletions
diff --git a/fs/nfsd/nfs4callback.c b/fs/nfsd/nfs4callback.c
index 3fd23f7..24e8d78 100644
--- a/fs/nfsd/nfs4callback.c
+++ b/fs/nfsd/nfs4callback.c
@@ -43,25 +43,30 @@
#include <linux/sunrpc/xdr.h>
#include <linux/sunrpc/svc.h>
#include <linux/sunrpc/clnt.h>
+#include <linux/sunrpc/svcsock.h>
#include <linux/nfsd/nfsd.h>
#include <linux/nfsd/state.h>
#include <linux/sunrpc/sched.h>
#include <linux/nfs4.h>
+#include <linux/sunrpc/xprtsock.h>
#define NFSDDBG_FACILITY NFSDDBG_PROC
#define NFSPROC4_CB_NULL 0
#define NFSPROC4_CB_COMPOUND 1
+#define NFS4_STATEID_SIZE 16
/* Index of predefined Linux callback client operations */
enum {
- NFSPROC4_CLNT_CB_NULL = 0,
+ NFSPROC4_CLNT_CB_NULL = 0,
NFSPROC4_CLNT_CB_RECALL,
+ NFSPROC4_CLNT_CB_SEQUENCE,
};
enum nfs_cb_opnum4 {
OP_CB_RECALL = 4,
+ OP_CB_SEQUENCE = 11,
};
#define NFS4_MAXTAGLEN 20
@@ -70,17 +75,29 @@ enum nfs_cb_opnum4 {
#define NFS4_dec_cb_null_sz 0
#define cb_compound_enc_hdr_sz 4
#define cb_compound_dec_hdr_sz (3 + (NFS4_MAXTAGLEN >> 2))
+#define sessionid_sz (NFS4_MAX_SESSIONID_LEN >> 2)
+#define cb_sequence_enc_sz (sessionid_sz + 4 + \
+ 1 /* no referring calls list yet */)
+#define cb_sequence_dec_sz (op_dec_sz + sessionid_sz + 4)
+
#define op_enc_sz 1
#define op_dec_sz 2
#define enc_nfs4_fh_sz (1 + (NFS4_FHSIZE >> 2))
#define enc_stateid_sz (NFS4_STATEID_SIZE >> 2)
#define NFS4_enc_cb_recall_sz (cb_compound_enc_hdr_sz + \
+ cb_sequence_enc_sz + \
1 + enc_stateid_sz + \
enc_nfs4_fh_sz)
#define NFS4_dec_cb_recall_sz (cb_compound_dec_hdr_sz + \
+ cb_sequence_dec_sz + \
op_dec_sz)
+struct nfs4_rpc_args {
+ void *args_op;
+ struct nfsd4_cb_sequence args_seq;
+};
+
/*
* Generic encode routines from fs/nfs/nfs4xdr.c
*/
@@ -137,11 +154,13 @@ xdr_error: \
} while (0)
struct nfs4_cb_compound_hdr {
- int status;
- u32 ident;
+ /* args */
+ u32 ident; /* minorversion 0 only */
u32 nops;
__be32 *nops_p;
u32 minorversion;
+ /* res */
+ int status;
u32 taglen;
char *tag;
};
@@ -238,6 +257,27 @@ encode_cb_recall(struct xdr_stream *xdr, struct nfs4_delegation *dp,
hdr->nops++;
}
+static void
+encode_cb_sequence(struct xdr_stream *xdr, struct nfsd4_cb_sequence *args,
+ struct nfs4_cb_compound_hdr *hdr)
+{
+ __be32 *p;
+
+ if (hdr->minorversion == 0)
+ return;
+
+ RESERVE_SPACE(1 + NFS4_MAX_SESSIONID_LEN + 20);
+
+ WRITE32(OP_CB_SEQUENCE);
+ WRITEMEM(args->cbs_clp->cl_sessionid.data, NFS4_MAX_SESSIONID_LEN);
+ WRITE32(args->cbs_clp->cl_cb_seq_nr);
+ WRITE32(0); /* slotid, always 0 */
+ WRITE32(0); /* highest slotid always 0 */
+ WRITE32(0); /* cachethis always 0 */
+ WRITE32(0); /* FIXME: support referring_call_lists */
+ hdr->nops++;
+}
+
static int
nfs4_xdr_enc_cb_null(struct rpc_rqst *req, __be32 *p)
{
@@ -249,15 +289,19 @@ nfs4_xdr_enc_cb_null(struct rpc_rqst *req, __be32 *p)
}
static int
-nfs4_xdr_enc_cb_recall(struct rpc_rqst *req, __be32 *p, struct nfs4_delegation *args)
+nfs4_xdr_enc_cb_recall(struct rpc_rqst *req, __be32 *p,
+ struct nfs4_rpc_args *rpc_args)
{
struct xdr_stream xdr;
+ struct nfs4_delegation *args = rpc_args->args_op;
struct nfs4_cb_compound_hdr hdr = {
.ident = args->dl_ident,
+ .minorversion = rpc_args->args_seq.cbs_minorversion,
};
xdr_init_encode(&xdr, &req->rq_snd_buf, p);
encode_cb_compound_hdr(&xdr, &hdr);
+ encode_cb_sequence(&xdr, &rpc_args->args_seq, &hdr);
encode_cb_recall(&xdr, args, &hdr);
encode_cb_nops(&hdr);
return 0;
@@ -299,6 +343,57 @@ decode_cb_op_hdr(struct xdr_stream *xdr, enum nfs_opnum4 expected)
return 0;
}
+/*
+ * Our current back channel implmentation supports a single backchannel
+ * with a single slot.
+ */
+static int
+decode_cb_sequence(struct xdr_stream *xdr, struct nfsd4_cb_sequence *res,
+ struct rpc_rqst *rqstp)
+{
+ struct nfs4_sessionid id;
+ int status;
+ u32 dummy;
+ __be32 *p;
+
+ if (res->cbs_minorversion == 0)
+ return 0;
+
+ status = decode_cb_op_hdr(xdr, OP_CB_SEQUENCE);
+ if (status)
+ return status;
+
+ /*
+ * If the server returns different values for sessionID, slotID or
+ * sequence number, the server is looney tunes.
+ */
+ status = -ESERVERFAULT;
+
+ READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
+ memcpy(id.data, p, NFS4_MAX_SESSIONID_LEN);
+ p += XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN);
+ if (memcmp(id.data, res->cbs_clp->cl_sessionid.data,
+ NFS4_MAX_SESSIONID_LEN)) {
+ dprintk("%s Invalid session id\n", __func__);
+ goto out;
+ }
+ READ32(dummy);
+ if (dummy != res->cbs_clp->cl_cb_seq_nr) {
+ dprintk("%s Invalid sequence number\n", __func__);
+ goto out;
+ }
+ READ32(dummy); /* slotid must be 0 */
+ if (dummy != 0) {
+ dprintk("%s Invalid slotid\n", __func__);
+ goto out;
+ }
+ /* FIXME: process highest slotid and target highest slotid */
+ status = 0;
+out:
+ return status;
+}
+
+
static int
nfs4_xdr_dec_cb_null(struct rpc_rqst *req, __be32 *p)
{
@@ -306,7 +401,8 @@ nfs4_xdr_dec_cb_null(struct rpc_rqst *req, __be32 *p)
}
static int
-nfs4_xdr_dec_cb_recall(struct rpc_rqst *rqstp, __be32 *p)
+nfs4_xdr_dec_cb_recall(struct rpc_rqst *rqstp, __be32 *p,
+ struct nfsd4_cb_sequence *seq)
{
struct xdr_stream xdr;
struct nfs4_cb_compound_hdr hdr;
@@ -316,6 +412,11 @@ nfs4_xdr_dec_cb_recall(struct rpc_rqst *rqstp, __be32 *p)
status = decode_cb_compound_hdr(&xdr, &hdr);
if (status)
goto out;
+ if (seq) {
+ status = decode_cb_sequence(&xdr, seq, rqstp);
+ if (status)
+ goto out;
+ }
status = decode_cb_op_hdr(&xdr, OP_CB_RECALL);
out:
return status;
@@ -377,16 +478,15 @@ static int max_cb_time(void)
int setup_callback_client(struct nfs4_client *clp)
{
- struct sockaddr_in addr;
struct nfs4_cb_conn *cb = &clp->cl_cb_conn;
struct rpc_timeout timeparms = {
.to_initval = max_cb_time(),
.to_retries = 0,
};
struct rpc_create_args args = {
- .protocol = IPPROTO_TCP,
- .address = (struct sockaddr *)&addr,
- .addrsize = sizeof(addr),
+ .protocol = XPRT_TRANSPORT_TCP,
+ .address = (struct sockaddr *) &cb->cb_addr,
+ .addrsize = cb->cb_addrlen,
.timeout = &timeparms,
.program = &cb_program,
.prognumber = cb->cb_prog,
@@ -399,13 +499,10 @@ int setup_callback_client(struct nfs4_client *clp)
if (!clp->cl_principal && (clp->cl_flavor >= RPC_AUTH_GSS_KRB5))
return -EINVAL;
-
- /* Initialize address */
- memset(&addr, 0, sizeof(addr));
- addr.sin_family = AF_INET;
- addr.sin_port = htons(cb->cb_port);
- addr.sin_addr.s_addr = htonl(cb->cb_addr);
-
+ if (cb->cb_minorversion) {
+ args.bc_xprt = clp->cl_cb_xprt;
+ args.protocol = XPRT_TRANSPORT_BC_TCP;
+ }
/* Create RPC client */
client = rpc_create(&args);
if (IS_ERR(client)) {
@@ -439,42 +536,29 @@ static const struct rpc_call_ops nfsd4_cb_probe_ops = {
.rpc_call_done = nfsd4_cb_probe_done,
};
-static struct rpc_cred *lookup_cb_cred(struct nfs4_cb_conn *cb)
-{
- struct auth_cred acred = {
- .machine_cred = 1
- };
+static struct rpc_cred *callback_cred;
- /*
- * Note in the gss case this doesn't actually have to wait for a
- * gss upcall (or any calls to the client); this just creates a
- * non-uptodate cred which the rpc state machine will fill in with
- * a refresh_upcall later.
- */
- return rpcauth_lookup_credcache(cb->cb_client->cl_auth, &acred,
- RPCAUTH_LOOKUP_NEW);
+int set_callback_cred(void)
+{
+ callback_cred = rpc_lookup_machine_cred();
+ if (!callback_cred)
+ return -ENOMEM;
+ return 0;
}
+
void do_probe_callback(struct nfs4_client *clp)
{
struct nfs4_cb_conn *cb = &clp->cl_cb_conn;
struct rpc_message msg = {
.rpc_proc = &nfs4_cb_procedures[NFSPROC4_CLNT_CB_NULL],
.rpc_argp = clp,
+ .rpc_cred = callback_cred
};
- struct rpc_cred *cred;
int status;
- cred = lookup_cb_cred(cb);
- if (IS_ERR(cred)) {
- status = PTR_ERR(cred);
- goto out;
- }
- cb->cb_cred = cred;
- msg.rpc_cred = cb->cb_cred;
status = rpc_call_async(cb->cb_client, &msg, RPC_TASK_SOFT,
&nfsd4_cb_probe_ops, (void *)clp);
-out:
if (status) {
warn_no_callback_path(clp, status);
put_nfs4_client(clp);
@@ -503,11 +587,95 @@ nfsd4_probe_callback(struct nfs4_client *clp)
do_probe_callback(clp);
}
+/*
+ * There's currently a single callback channel slot.
+ * If the slot is available, then mark it busy. Otherwise, set the
+ * thread for sleeping on the callback RPC wait queue.
+ */
+static int nfsd41_cb_setup_sequence(struct nfs4_client *clp,
+ struct rpc_task *task)
+{
+ struct nfs4_rpc_args *args = task->tk_msg.rpc_argp;
+ u32 *ptr = (u32 *)clp->cl_sessionid.data;
+ int status = 0;
+
+ dprintk("%s: %u:%u:%u:%u\n", __func__,
+ ptr[0], ptr[1], ptr[2], ptr[3]);
+
+ if (test_and_set_bit(0, &clp->cl_cb_slot_busy) != 0) {
+ rpc_sleep_on(&clp->cl_cb_waitq, task, NULL);
+ dprintk("%s slot is busy\n", __func__);
+ status = -EAGAIN;
+ goto out;
+ }
+
+ /*
+ * We'll need the clp during XDR encoding and decoding,
+ * and the sequence during decoding to verify the reply
+ */
+ args->args_seq.cbs_clp = clp;
+ task->tk_msg.rpc_resp = &args->args_seq;
+
+out:
+ dprintk("%s status=%d\n", __func__, status);
+ return status;
+}
+
+/*
+ * TODO: cb_sequence should support referring call lists, cachethis, multiple
+ * slots, and mark callback channel down on communication errors.
+ */
+static void nfsd4_cb_prepare(struct rpc_task *task, void *calldata)
+{
+ struct nfs4_delegation *dp = calldata;
+ struct nfs4_client *clp = dp->dl_client;
+ struct nfs4_rpc_args *args = task->tk_msg.rpc_argp;
+ u32 minorversion = clp->cl_cb_conn.cb_minorversion;
+ int status = 0;
+
+ args->args_seq.cbs_minorversion = minorversion;
+ if (minorversion) {
+ status = nfsd41_cb_setup_sequence(clp, task);
+ if (status) {
+ if (status != -EAGAIN) {
+ /* terminate rpc task */
+ task->tk_status = status;
+ task->tk_action = NULL;
+ }
+ return;
+ }
+ }
+ rpc_call_start(task);
+}
+
+static void nfsd4_cb_done(struct rpc_task *task, void *calldata)
+{
+ struct nfs4_delegation *dp = calldata;
+ struct nfs4_client *clp = dp->dl_client;
+
+ dprintk("%s: minorversion=%d\n", __func__,
+ clp->cl_cb_conn.cb_minorversion);
+
+ if (clp->cl_cb_conn.cb_minorversion) {
+ /* No need for lock, access serialized in nfsd4_cb_prepare */
+ ++clp->cl_cb_seq_nr;
+ clear_bit(0, &clp->cl_cb_slot_busy);
+ rpc_wake_up_next(&clp->cl_cb_waitq);
+ dprintk("%s: freed slot, new seqid=%d\n", __func__,
+ clp->cl_cb_seq_nr);
+
+ /* We're done looking into the sequence information */
+ task->tk_msg.rpc_resp = NULL;
+ }
+}
+
static void nfsd4_cb_recall_done(struct rpc_task *task, void *calldata)
{
struct nfs4_delegation *dp = calldata;
struct nfs4_client *clp = dp->dl_client;
+ nfsd4_cb_done(task, calldata);
+
switch (task->tk_status) {
case -EIO:
/* Network partition? */
@@ -520,16 +688,19 @@ static void nfsd4_cb_recall_done(struct rpc_task *task, void *calldata)
break;
default:
/* success, or error we can't handle */
- return;
+ goto done;
}
if (dp->dl_retries--) {
rpc_delay(task, 2*HZ);
task->tk_status = 0;
rpc_restart_call(task);
+ return;
} else {
atomic_set(&clp->cl_cb_conn.cb_set, 0);
warn_no_callback_path(clp, task->tk_status);
}
+done:
+ kfree(task->tk_msg.rpc_argp);
}
static void nfsd4_cb_recall_release(void *calldata)
@@ -542,6 +713,7 @@ static void nfsd4_cb_recall_release(void *calldata)
}
static const struct rpc_call_ops nfsd4_cb_recall_ops = {
+ .rpc_call_prepare = nfsd4_cb_prepare,
.rpc_call_done = nfsd4_cb_recall_done,
.rpc_release = nfsd4_cb_recall_release,
};
@@ -554,17 +726,24 @@ nfsd4_cb_recall(struct nfs4_delegation *dp)
{
struct nfs4_client *clp = dp->dl_client;
struct rpc_clnt *clnt = clp->cl_cb_conn.cb_client;
+ struct nfs4_rpc_args *args;
struct rpc_message msg = {
.rpc_proc = &nfs4_cb_procedures[NFSPROC4_CLNT_CB_RECALL],
- .rpc_argp = dp,
- .rpc_cred = clp->cl_cb_conn.cb_cred
+ .rpc_cred = callback_cred
};
- int status;
+ int status = -ENOMEM;
+ args = kzalloc(sizeof(*args), GFP_KERNEL);
+ if (!args)
+ goto out;
+ args->args_op = dp;
+ msg.rpc_argp = args;
dp->dl_retries = 1;
status = rpc_call_async(clnt, &msg, RPC_TASK_SOFT,
&nfsd4_cb_recall_ops, dp);
+out:
if (status) {
+ kfree(args);
put_nfs4_client(clp);
nfs4_put_delegation(dp);
}
generated by cgit v1.1 at 2024-10-31 05:24:52 +0000