#include <linux/inet.h>
#include <linux/errno.h>
#include <linux/delay.h>
+#include <linux/sched.h>
+#include <linux/kthread.h>
#include <linux/sunrpc/xdr.h>
#include <linux/sunrpc/svc.h>
#include <linux/sunrpc/clnt.h>
#define NFSPROC4_CB_NULL 0
#define NFSPROC4_CB_COMPOUND 1
-/* declarations */
-static const struct rpc_call_ops nfs4_cb_null_ops;
-
/* Index of predefined Linux callback client operations */
enum {
#define op_enc_sz 1
#define op_dec_sz 2
#define enc_nfs4_fh_sz (1 + (NFS4_FHSIZE >> 2))
-#define enc_stateid_sz 16
+#define enc_stateid_sz (NFS4_STATEID_SIZE >> 2)
#define NFS4_enc_cb_recall_sz (cb_compound_enc_hdr_sz + \
1 + enc_stateid_sz + \
enc_nfs4_fh_sz)
} while (0)
#define RESERVE_SPACE(nbytes) do { \
p = xdr_reserve_space(xdr, nbytes); \
- if (!p) dprintk("NFSD: RESERVE_SPACE(%d) failed in function %s\n", (int) (nbytes), __FUNCTION__); \
+ if (!p) dprintk("NFSD: RESERVE_SPACE(%d) failed in function %s\n", (int) (nbytes), __func__); \
BUG_ON(!p); \
} while (0)
p = xdr_inline_decode(xdr, nbytes); \
if (!p) { \
dprintk("NFSD: %s: reply buffer overflowed in line %d.\n", \
- __FUNCTION__, __LINE__); \
+ __func__, __LINE__); \
return -EIO; \
} \
} while (0)
}
static int
-encode_cb_recall(struct xdr_stream *xdr, struct nfs4_cb_recall *cb_rec)
+encode_cb_recall(struct xdr_stream *xdr, struct nfs4_delegation *dp)
{
__be32 *p;
- int len = cb_rec->cbr_fhlen;
+ int len = dp->dl_fh.fh_size;
- RESERVE_SPACE(12+sizeof(cb_rec->cbr_stateid) + len);
+ RESERVE_SPACE(12+sizeof(dp->dl_stateid) + len);
WRITE32(OP_CB_RECALL);
- WRITEMEM(&cb_rec->cbr_stateid, sizeof(stateid_t));
- WRITE32(cb_rec->cbr_trunc);
+ WRITE32(dp->dl_stateid.si_generation);
+ WRITEMEM(&dp->dl_stateid.si_opaque, sizeof(stateid_opaque_t));
+ WRITE32(0); /* truncate optimization not implemented */
WRITE32(len);
- WRITEMEM(cb_rec->cbr_fhval, len);
+ WRITEMEM(&dp->dl_fh.fh_base, len);
return 0;
}
}
static int
-nfs4_xdr_enc_cb_recall(struct rpc_rqst *req, __be32 *p, struct nfs4_cb_recall *args)
+nfs4_xdr_enc_cb_recall(struct rpc_rqst *req, __be32 *p, struct nfs4_delegation *args)
{
struct xdr_stream xdr;
struct nfs4_cb_compound_hdr hdr = {
- .ident = args->cbr_ident,
+ .ident = args->dl_ident,
.nops = 1,
};
&nfs_cb_version4,
};
-/*
- * Use the SETCLIENTID credential
- */
-static struct rpc_cred *
-nfsd4_lookupcred(struct nfs4_client *clp, int taskflags)
+static struct rpc_program cb_program;
+
+static struct rpc_stat cb_stats = {
+ .program = &cb_program
+};
+
+#define NFS4_CALLBACK 0x40000000
+static struct rpc_program cb_program = {
+ .name = "nfs4_cb",
+ .number = NFS4_CALLBACK,
+ .nrvers = ARRAY_SIZE(nfs_cb_version),
+ .version = nfs_cb_version,
+ .stats = &cb_stats,
+ .pipe_dir_name = "/nfsd4_cb",
+};
+
+static int max_cb_time(void)
{
- struct auth_cred acred;
- struct rpc_clnt *clnt = clp->cl_callback.cb_client;
- struct rpc_cred *ret;
-
- get_group_info(clp->cl_cred.cr_group_info);
- acred.uid = clp->cl_cred.cr_uid;
- acred.gid = clp->cl_cred.cr_gid;
- acred.group_info = clp->cl_cred.cr_group_info;
-
- dprintk("NFSD: looking up %s cred\n",
- clnt->cl_auth->au_ops->au_name);
- ret = rpcauth_lookup_credcache(clnt->cl_auth, &acred, taskflags);
- put_group_info(clp->cl_cred.cr_group_info);
- return ret;
+ return max(NFSD_LEASE_TIME/10, (time_t)1) * HZ;
}
-/*
- * Set up the callback client and put a NFSPROC4_CB_NULL on the wire...
- */
-void
-nfsd4_probe_callback(struct nfs4_client *clp)
+/* Reference counting, callback cleanup, etc., all look racy as heck.
+ * And why is cb_set an atomic? */
+
+int setup_callback_client(struct nfs4_client *clp)
{
struct sockaddr_in addr;
- struct nfs4_callback *cb = &clp->cl_callback;
+ struct nfs4_cb_conn *cb = &clp->cl_cb_conn;
struct rpc_timeout timeparms = {
- .to_initval = (NFSD_LEASE_TIME/4) * HZ,
- .to_retries = 5,
- .to_maxval = (NFSD_LEASE_TIME/2) * HZ,
- .to_exponential = 1,
+ .to_initval = max_cb_time(),
+ .to_retries = 0,
};
- struct rpc_program * program = &cb->cb_program;
struct rpc_create_args args = {
.protocol = IPPROTO_TCP,
.address = (struct sockaddr *)&addr,
.addrsize = sizeof(addr),
.timeout = &timeparms,
- .program = program,
+ .program = &cb_program,
+ .prognumber = cb->cb_prog,
.version = nfs_cb_version[1]->number,
- .authflavor = RPC_AUTH_UNIX, /* XXX: need AUTH_GSS... */
- .flags = (RPC_CLNT_CREATE_NOPING),
- };
- struct rpc_message msg = {
- .rpc_proc = &nfs4_cb_procedures[NFSPROC4_CLNT_CB_NULL],
- .rpc_argp = clp,
+ .authflavor = clp->cl_flavor,
+ .flags = (RPC_CLNT_CREATE_NOPING | RPC_CLNT_CREATE_QUIET),
+ .client_name = clp->cl_principal,
};
- char clientname[16];
- int status;
+ struct rpc_clnt *client;
- if (atomic_read(&cb->cb_set))
- return;
+ if (!clp->cl_principal && (clp->cl_flavor >= RPC_AUTH_GSS_KRB5))
+ return -EINVAL;
/* Initialize address */
memset(&addr, 0, sizeof(addr));
addr.sin_port = htons(cb->cb_port);
addr.sin_addr.s_addr = htonl(cb->cb_addr);
- /* Initialize rpc_program */
- program->name = "nfs4_cb";
- program->number = cb->cb_prog;
- program->nrvers = ARRAY_SIZE(nfs_cb_version);
- program->version = nfs_cb_version;
- program->stats = &cb->cb_stat;
+ /* Create RPC client */
+ client = rpc_create(&args);
+ if (IS_ERR(client)) {
+ dprintk("NFSD: couldn't create callback client: %ld\n",
+ PTR_ERR(client));
+ return PTR_ERR(client);
+ }
+ cb->cb_client = client;
+ return 0;
+
+}
- /* Initialize rpc_stat */
- memset(program->stats, 0, sizeof(cb->cb_stat));
- program->stats->program = program;
+static void warn_no_callback_path(struct nfs4_client *clp, int reason)
+{
+ dprintk("NFSD: warning: no callback path to client %.*s: error %d\n",
+ (int)clp->cl_name.len, clp->cl_name.data, reason);
+}
- /* Just here to make some printk's more useful: */
- snprintf(clientname, sizeof(clientname),
- "%u.%u.%u.%u", NIPQUAD(addr.sin_addr));
- args.servername = clientname;
+static void nfsd4_cb_probe_done(struct rpc_task *task, void *calldata)
+{
+ struct nfs4_client *clp = calldata;
- /* Create RPC client */
- cb->cb_client = rpc_create(&args);
- if (IS_ERR(cb->cb_client)) {
- dprintk("NFSD: couldn't create callback client\n");
- goto out_err;
+ if (task->tk_status)
+ warn_no_callback_path(clp, task->tk_status);
+ else
+ atomic_set(&clp->cl_cb_conn.cb_set, 1);
+ put_nfs4_client(clp);
+}
+
+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
+ };
+
+ /*
+ * 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);
+}
+
+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,
+ };
+ 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);
+ }
+}
- /* Kick rpciod, put the call on the wire. */
- if (rpciod_up() != 0)
- goto out_clnt;
+/*
+ * Set up the callback client and put a NFSPROC4_CB_NULL on the wire...
+ */
+void
+nfsd4_probe_callback(struct nfs4_client *clp)
+{
+ int status;
+
+ BUG_ON(atomic_read(&clp->cl_cb_conn.cb_set));
+
+ status = setup_callback_client(clp);
+ if (status) {
+ warn_no_callback_path(clp, status);
+ return;
+ }
/* the task holds a reference to the nfs4_client struct */
atomic_inc(&clp->cl_count);
- msg.rpc_cred = nfsd4_lookupcred(clp,0);
- if (IS_ERR(msg.rpc_cred))
- goto out_rpciod;
- status = rpc_call_async(cb->cb_client, &msg, RPC_TASK_ASYNC, &nfs4_cb_null_ops, NULL);
- put_rpccred(msg.rpc_cred);
+ do_probe_callback(clp);
+}
+
+static void nfsd4_cb_recall_done(struct rpc_task *task, void *calldata)
+{
+ struct nfs4_delegation *dp = calldata;
+ struct nfs4_client *clp = dp->dl_client;
- if (status != 0) {
- dprintk("NFSD: asynchronous NFSPROC4_CB_NULL failed!\n");
- goto out_rpciod;
+ switch (task->tk_status) {
+ case -EIO:
+ /* Network partition? */
+ atomic_set(&clp->cl_cb_conn.cb_set, 0);
+ warn_no_callback_path(clp, task->tk_status);
+ case -EBADHANDLE:
+ case -NFS4ERR_BAD_STATEID:
+ /* Race: client probably got cb_recall
+ * before open reply granting delegation */
+ break;
+ default:
+ /* success, or error we can't handle */
+ return;
+ }
+ if (dp->dl_retries--) {
+ rpc_delay(task, 2*HZ);
+ task->tk_status = 0;
+ rpc_restart_call(task);
+ } else {
+ atomic_set(&clp->cl_cb_conn.cb_set, 0);
+ warn_no_callback_path(clp, task->tk_status);
}
- return;
-
-out_rpciod:
- atomic_dec(&clp->cl_count);
- rpciod_down();
-out_clnt:
- rpc_shutdown_client(cb->cb_client);
-out_err:
- cb->cb_client = NULL;
- dprintk("NFSD: warning: no callback path to client %.*s\n",
- (int)clp->cl_name.len, clp->cl_name.data);
}
-static void
-nfs4_cb_null(struct rpc_task *task, void *dummy)
+static void nfsd4_cb_recall_release(void *calldata)
{
- struct nfs4_client *clp = (struct nfs4_client *)task->tk_msg.rpc_argp;
- struct nfs4_callback *cb = &clp->cl_callback;
- __be32 addr = htonl(cb->cb_addr);
-
- dprintk("NFSD: nfs4_cb_null task->tk_status %d\n", task->tk_status);
+ struct nfs4_delegation *dp = calldata;
+ struct nfs4_client *clp = dp->dl_client;
- if (task->tk_status < 0) {
- dprintk("NFSD: callback establishment to client %.*s failed\n",
- (int)clp->cl_name.len, clp->cl_name.data);
- goto out;
- }
- atomic_set(&cb->cb_set, 1);
- dprintk("NFSD: callback set to client %u.%u.%u.%u\n", NIPQUAD(addr));
-out:
+ nfs4_put_delegation(dp);
put_nfs4_client(clp);
}
-static const struct rpc_call_ops nfs4_cb_null_ops = {
- .rpc_call_done = nfs4_cb_null,
+static const struct rpc_call_ops nfsd4_cb_recall_ops = {
+ .rpc_call_done = nfsd4_cb_recall_done,
+ .rpc_release = nfsd4_cb_recall_release,
};
/*
* called with dp->dl_count inc'ed.
- * nfs4_lock_state() may or may not have been called.
*/
void
nfsd4_cb_recall(struct nfs4_delegation *dp)
{
struct nfs4_client *clp = dp->dl_client;
- struct rpc_clnt *clnt = clp->cl_callback.cb_client;
- struct nfs4_cb_recall *cbr = &dp->dl_recall;
+ struct rpc_clnt *clnt = clp->cl_cb_conn.cb_client;
struct rpc_message msg = {
.rpc_proc = &nfs4_cb_procedures[NFSPROC4_CLNT_CB_RECALL],
- .rpc_argp = cbr,
+ .rpc_argp = dp,
+ .rpc_cred = clp->cl_cb_conn.cb_cred
};
- int retries = 1;
- int status = 0;
-
- if ((!atomic_read(&clp->cl_callback.cb_set)) || !clnt)
- return;
-
- msg.rpc_cred = nfsd4_lookupcred(clp, 0);
- if (IS_ERR(msg.rpc_cred))
- goto out;
+ int status;
- cbr->cbr_trunc = 0; /* XXX need to implement truncate optimization */
- cbr->cbr_dp = dp;
-
- status = rpc_call_sync(clnt, &msg, RPC_TASK_SOFT);
- while (retries--) {
- switch (status) {
- case -EIO:
- /* Network partition? */
- case -EBADHANDLE:
- case -NFS4ERR_BAD_STATEID:
- /* Race: client probably got cb_recall
- * before open reply granting delegation */
- break;
- default:
- goto out_put_cred;
- }
- ssleep(2);
- status = rpc_call_sync(clnt, &msg, RPC_TASK_SOFT);
+ dp->dl_retries = 1;
+ status = rpc_call_async(clnt, &msg, RPC_TASK_SOFT,
+ &nfsd4_cb_recall_ops, dp);
+ if (status) {
+ put_nfs4_client(clp);
+ nfs4_put_delegation(dp);
}
-out_put_cred:
- put_rpccred(msg.rpc_cred);
-out:
- if (status == -EIO)
- atomic_set(&clp->cl_callback.cb_set, 0);
- /* Success or failure, now we're either waiting for lease expiration
- * or deleg_return. */
- dprintk("NFSD: nfs4_cb_recall: dp %p dl_flock %p dl_count %d\n",dp, dp->dl_flock, atomic_read(&dp->dl_count));
- nfs4_put_delegation(dp);
- return;
}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff