/*
* This is the lockd kernel thread
*/
static void
lockd(struct svc_rqst *rqstp)
{
int err = 0;
unsigned long grace_period_expire;
/* Lock module and set up kernel thread */
/* lockd_up is waiting for us to startup, so will
* be holding a reference to this module, so it
* is safe to just claim another reference
*/
__module_get(THIS_MODULE);
lock_kernel();
/*
* Let our maker know we're running.
*/
nlmsvc_pid = current->pid;
nlmsvc_serv = rqstp->rq_server;
complete(&lockd_start_done);
daemonize("lockd");
/* Process request with signals blocked, but allow SIGKILL. */
allow_signal(SIGKILL);
/* kick rpciod */
rpciod_up();
dprintk("NFS locking service started (ver " LOCKD_VERSION ").\n");
if (!nlm_timeout)
nlm_timeout = LOCKD_DFLT_TIMEO;
nlmsvc_timeout = nlm_timeout * HZ;
grace_period_expire = set_grace_period();
/*
* The main request loop. We don't terminate until the last
* NFS mount or NFS daemon has gone away, and we've been sent a
* signal, or else another process has taken over our job.
*/
while ((nlmsvc_users || !signalled()) && nlmsvc_pid == current->pid) {
long timeout = MAX_SCHEDULE_TIMEOUT;
if (signalled()) {
flush_signals(current);
if (nlmsvc_ops) {
nlmsvc_invalidate_all();
grace_period_expire = set_grace_period();
}
}
/*
* Retry any blocked locks that have been notified by
* the VFS. Don't do this during grace period.
* (Theoretically, there shouldn't even be blocked locks
* during grace period).
*/
if (!nlmsvc_grace_period) {
timeout = nlmsvc_retry_blocked();
} else if (time_before(grace_period_expire, jiffies))
clear_grace_period();
/*
* Find a socket with data available and call its
* recvfrom routine.
*/
err = svc_recv(rqstp, timeout);
if (err == -EAGAIN || err == -EINTR)
continue;
if (err < 0) {
printk(KERN_WARNING
"lockd: terminating on error %d\n",
-err);
break;
}
dprintk("lockd: request from %08x\n",
(unsigned)ntohl(rqstp->rq_addr.sin_addr.s_addr));
svc_process(rqstp);
}
flush_signals(current);
/*
* Check whether there's a new lockd process before
* shutting down the hosts and clearing the slot.
*/
if (!nlmsvc_pid || current->pid == nlmsvc_pid) {
if (nlmsvc_ops)
nlmsvc_invalidate_all();
nlm_shutdown_hosts();
nlmsvc_pid = 0;
nlmsvc_serv = NULL;
} else
printk(KERN_DEBUG
"lockd: new process, skipping host shutdown\n");
wake_up(&lockd_exit);
/* Exit the RPC thread */
svc_exit_thread(rqstp);
/* release rpciod */
rpciod_down();
/* Release module */
unlock_kernel();
module_put_and_exit(0);
}
/*
* The way this works is that the mount process passes a structure
* in the data argument which contains the server's IP address
* and the root file handle obtained from the server's mount
* daemon. We stash these away in the private superblock fields.
*/
struct super_block *
nfs_read_super(struct super_block *sb, void *raw_data, int silent)
{
struct nfs_mount_data *data = (struct nfs_mount_data *) raw_data;
struct nfs_server *server;
struct rpc_xprt *xprt;
struct rpc_clnt *clnt;
struct nfs_fh *root_fh;
struct inode *root_inode;
unsigned int authflavor;
int tcp;
struct sockaddr_in srvaddr;
struct rpc_timeout timeparms;
struct nfs_fattr fattr;
MOD_INC_USE_COUNT;
if (!data)
goto out_miss_args;
/* No NFS V3. */
if (data->flags & NFS_MOUNT_VER3)
goto out_fail;
/* Don't complain if "mount" is newer. */
if (data->version < NFS_MOUNT_VERSION) {
printk("nfs warning: mount version %s than kernel\n",
data->version < NFS_MOUNT_VERSION ? "older" : "newer");
if (data->version < 2)
data->namlen = 0;
if (data->version < 3)
data->bsize = 0;
}
/* We now require that the mount process passes the remote address */
memcpy(&srvaddr, &data->addr, sizeof(srvaddr));
if (srvaddr.sin_addr.s_addr == INADDR_ANY)
goto out_no_remote;
lock_super(sb);
sb->s_flags |= MS_ODD_RENAME; /* This should go away */
sb->s_magic = NFS_SUPER_MAGIC;
sb->s_op = &nfs_sops;
sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
sb->u.nfs_sb.s_root = data->root;
server = &sb->u.nfs_sb.s_server;
server->rsize = nfs_block_size(data->rsize, NULL);
server->wsize = nfs_block_size(data->wsize, NULL);
server->flags = data->flags;
if (data->flags & NFS_MOUNT_NOAC) {
data->acregmin = data->acregmax = 0;
data->acdirmin = data->acdirmax = 0;
}
server->acregmin = data->acregmin*HZ;
server->acregmax = data->acregmax*HZ;
server->acdirmin = data->acdirmin*HZ;
server->acdirmax = data->acdirmax*HZ;
server->hostname = kmalloc(strlen(data->hostname) + 1, GFP_KERNEL);
if (!server->hostname)
goto out_unlock;
strcpy(server->hostname, data->hostname);
/* Which protocol do we use? */
tcp = (data->flags & NFS_MOUNT_TCP);
/* Initialize timeout values */
timeparms.to_initval = data->timeo * HZ / 10;
timeparms.to_retries = data->retrans;
timeparms.to_maxval = tcp? RPC_MAX_TCP_TIMEOUT : RPC_MAX_UDP_TIMEOUT;
timeparms.to_exponential = 1;
/* Now create transport and client */
xprt = xprt_create_proto(tcp? IPPROTO_TCP : IPPROTO_UDP,
&srvaddr, &timeparms);
if (xprt == NULL)
goto out_no_xprt;
/* Choose authentication flavor */
authflavor = RPC_AUTH_UNIX;
if (data->flags & NFS_MOUNT_SECURE)
authflavor = RPC_AUTH_DES;
else if (data->flags & NFS_MOUNT_KERBEROS)
authflavor = RPC_AUTH_KRB;
clnt = rpc_create_client(xprt, server->hostname, &nfs_program,
NFS_VERSION, authflavor);
if (clnt == NULL)
goto out_no_client;
clnt->cl_intr = (data->flags & NFS_MOUNT_INTR)? 1 : 0;
clnt->cl_softrtry = (data->flags & NFS_MOUNT_SOFT)? 1 : 0;
clnt->cl_chatty = 1;
server->client = clnt;
/* Fire up rpciod if not yet running */
if (rpciod_up() != 0)
goto out_no_iod;
/*
* Keep the super block locked while we try to get
* the root fh attributes.
*/
root_fh = kmalloc(sizeof(struct nfs_fh), GFP_KERNEL);
if (!root_fh)
goto out_no_fh;
*root_fh = data->root;
if (nfs_proc_getattr(server, root_fh, &fattr) != 0)
goto out_no_fattr;
clnt->cl_to_err = 1;
root_inode = __nfs_fhget(sb, &fattr);
if (!root_inode)
goto out_no_root;
sb->s_root = d_alloc_root(root_inode, NULL);
if (!sb->s_root)
goto out_no_root;
sb->s_root->d_op = &nfs_dentry_operations;
sb->s_root->d_fsdata = root_fh;
/* We're airborne */
unlock_super(sb);
/* Check whether to start the lockd process */
if (!(server->flags & NFS_MOUNT_NONLM))
lockd_up();
return sb;
/* Yargs. It didn't work out. */
out_no_root:
printk("nfs_read_super: get root inode failed\n");
iput(root_inode);
goto out_free_fh;
out_no_fattr:
printk("nfs_read_super: get root fattr failed\n");
out_free_fh:
kfree(root_fh);
out_no_fh:
rpciod_down();
goto out_shutdown;
out_no_iod:
printk(KERN_WARNING "NFS: couldn't start rpciod!\n");
out_shutdown:
rpc_shutdown_client(server->client);
goto out_free_host;
out_no_client:
printk(KERN_WARNING "NFS: cannot create RPC client.\n");
xprt_destroy(xprt);
goto out_free_host;
out_no_xprt:
printk(KERN_WARNING "NFS: cannot create RPC transport.\n");
out_free_host:
kfree(server->hostname);
out_unlock:
unlock_super(sb);
goto out_fail;
out_no_remote:
printk("NFS: mount program didn't pass remote address!\n");
goto out_fail;
out_miss_args:
printk("nfs_read_super: missing data argument\n");
out_fail:
sb->s_dev = 0;
MOD_DEC_USE_COUNT;
return NULL;
}
/*
* Set up the callback client and put a NFSPROC4_CB_NULL on the wire...
*/
void
nfsd4_probe_callback(struct nfs4_client *clp)
{
struct sockaddr_in addr, saddr;
struct nfs4_callback *cb = &clp->cl_callback;
struct rpc_timeout timeparms;
struct rpc_xprt * xprt;
struct rpc_program * program = &cb->cb_program;
struct rpc_stat * stat = &cb->cb_stat;
struct rpc_clnt * clnt;
struct rpc_message msg = {
.rpc_proc = &nfs4_cb_procedures[NFSPROC4_CLNT_CB_NULL],
.rpc_argp = clp,
};
char hostname[32];
int status;
if (atomic_read(&cb->cb_set))
return;
/* 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);
/* Initialize timeout */
timeparms.to_initval = (NFSD_LEASE_TIME/4) * HZ;
timeparms.to_retries = 0;
timeparms.to_maxval = (NFSD_LEASE_TIME/2) * HZ;
timeparms.to_exponential = 1;
/* Create RPC transport */
xprt = xprt_create_proto(IPPROTO_TCP, &addr, &timeparms);
if (IS_ERR(xprt)) {
dprintk("NFSD: couldn't create callback transport!\n");
goto out_err;
}
/* 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 = stat;
/* Initialize rpc_stat */
memset(stat, 0, sizeof(struct rpc_stat));
stat->program = program;
/* Create RPC client
*
* XXX AUTH_UNIX only - need AUTH_GSS....
*/
sprintf(hostname, "%u.%u.%u.%u", NIPQUAD(addr.sin_addr.s_addr));
clnt = rpc_new_client(xprt, hostname, program, 1, RPC_AUTH_UNIX);
if (IS_ERR(clnt)) {
dprintk("NFSD: couldn't create callback client\n");
goto out_err;
}
clnt->cl_intr = 0;
clnt->cl_softrtry = 1;
/* Set source address */
if (cb->cb_saddr){
memset(&saddr, 0, sizeof(saddr));
saddr.sin_family = AF_INET;
saddr.sin_addr.s_addr = cb->cb_saddr;
xprt->srcaddr = saddr;
}
/* Kick rpciod, put the call on the wire. */
if (rpciod_up() != 0) {
dprintk("nfsd: couldn't start rpciod for callbacks!\n");
goto out_clnt;
}
cb->cb_client = clnt;
/* 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(clnt, &msg, RPC_TASK_ASYNC, &nfs4_cb_null_ops, NULL);
put_rpccred(msg.rpc_cred);
if (status != 0) {
dprintk("NFSD: asynchronous NFSPROC4_CB_NULL failed!\n");
goto out_rpciod;
}
return;
out_rpciod:
atomic_dec(&clp->cl_count);
rpciod_down();
cb->cb_client = NULL;
out_clnt:
rpc_shutdown_client(clnt);
out_err:
dprintk("NFSD: warning: no callback path to client %.*s\n",
(int)clp->cl_name.len, clp->cl_name.data);
}
/*
* This is the lockd kernel thread
*/
static void
lockd(struct svc_rqst *rqstp)
{
struct svc_serv *serv = rqstp->rq_server;
int err = 0;
unsigned long grace_period_expire;
/* Lock module and set up kernel thread */
MOD_INC_USE_COUNT;
lock_kernel();
/*
* Let our maker know we're running.
*/
nlmsvc_pid = current->pid;
up(&lockd_start);
daemonize();
reparent_to_init();
sprintf(current->comm, "lockd");
/* Process request with signals blocked. */
spin_lock_irq(¤t->sighand->siglock);
siginitsetinv(¤t->blocked, sigmask(SIGKILL));
recalc_sigpending();
spin_unlock_irq(¤t->sighand->siglock);
/* kick rpciod */
rpciod_up();
dprintk("NFS locking service started (ver " LOCKD_VERSION ").\n");
if (!nlm_timeout)
nlm_timeout = LOCKD_DFLT_TIMEO;
nlmsvc_timeout = nlm_timeout * HZ;
grace_period_expire = set_grace_period();
/*
* The main request loop. We don't terminate until the last
* NFS mount or NFS daemon has gone away, and we've been sent a
* signal, or else another process has taken over our job.
*/
while ((nlmsvc_users || !signalled()) && nlmsvc_pid == current->pid)
{
long timeout = MAX_SCHEDULE_TIMEOUT;
if (signalled()) {
spin_lock_irq(¤t->sighand->siglock);
flush_signals(current);
spin_unlock_irq(¤t->sighand->siglock);
if (nlmsvc_ops) {
nlmsvc_ops->detach();
grace_period_expire = set_grace_period();
}
}
/*
* Retry any blocked locks that have been notified by
* the VFS. Don't do this during grace period.
* (Theoretically, there shouldn't even be blocked locks
* during grace period).
*/
if (!nlmsvc_grace_period)
timeout = nlmsvc_retry_blocked();
/*
* Find a socket with data available and call its
* recvfrom routine.
*/
err = svc_recv(serv, rqstp, timeout);
if (err == -EAGAIN || err == -EINTR)
continue;
if (err < 0) {
printk(KERN_WARNING
"lockd: terminating on error %d\n",
-err);
break;
}
dprintk("lockd: request from %08x\n",
(unsigned)ntohl(rqstp->rq_addr.sin_addr.s_addr));
/*
* Look up the NFS client handle. The handle is needed for
* all but the GRANTED callback RPCs.
*/
rqstp->rq_client = NULL;
if (nlmsvc_ops) {
nlmsvc_ops->exp_readlock();
rqstp->rq_client =
nlmsvc_ops->exp_getclient(&rqstp->rq_addr);
}
if (nlmsvc_grace_period &&
time_before(grace_period_expire, jiffies))
nlmsvc_grace_period = 0;
svc_process(serv, rqstp);
/* Unlock export hash tables */
if (nlmsvc_ops)
nlmsvc_ops->exp_unlock();
}
/*
* Check whether there's a new lockd process before
* shutting down the hosts and clearing the slot.
*/
if (!nlmsvc_pid || current->pid == nlmsvc_pid) {
if (nlmsvc_ops)
nlmsvc_ops->detach();
nlm_shutdown_hosts();
nlmsvc_pid = 0;
} else
printk(KERN_DEBUG
"lockd: new process, skipping host shutdown\n");
wake_up(&lockd_exit);
/* Exit the RPC thread */
svc_exit_thread(rqstp);
/* release rpciod */
rpciod_down();
/* Release module */
MOD_DEC_USE_COUNT;
}
