static int nfsd_startup(unsigned short port, int nrservs)
{
int ret;
if (nfsd_up)
return 0;
/*
* Readahead param cache - will no-op if it already exists.
* (Note therefore results will be suboptimal if number of
* threads is modified after nfsd start.)
*/
ret = nfsd_racache_init(2*nrservs);
if (ret)
return ret;
ret = nfsd_init_socks(port);
if (ret)
goto out_racache;
ret = lockd_up();
if (ret)
goto out_racache;
ret = nfs4_state_start();
if (ret)
goto out_lockd;
nfsd_up = true;
return 0;
out_lockd:
lockd_down();
out_racache:
nfsd_racache_shutdown();
return ret;
}
static int nfsd_startup_net(int nrservs, struct net *net)
{
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
int ret;
if (nn->nfsd_net_up)
return 0;
ret = nfsd_startup_generic(nrservs);
if (ret)
return ret;
ret = nfsd_init_socks(net);
if (ret)
goto out_socks;
ret = lockd_up(net);
if (ret)
goto out_socks;
ret = nfs4_state_start_net(net);
if (ret)
goto out_lockd;
nn->nfsd_net_up = true;
return 0;
out_lockd:
lockd_down(net);
out_socks:
nfsd_shutdown_generic();
return ret;
}
static int nfsd_startup(unsigned short port, int nrservs)
{
int ret;
if (nfsd_up)
return 0;
/*
*/
ret = nfsd_racache_init(2*nrservs);
if (ret)
return ret;
ret = nfsd_init_socks(port);
if (ret)
goto out_racache;
ret = lockd_up();
if (ret)
goto out_racache;
ret = nfs4_state_start();
if (ret)
goto out_lockd;
nfsd_up = true;
return 0;
out_lockd:
lockd_down();
out_racache:
nfsd_racache_shutdown();
return ret;
}
static ssize_t write_ports(struct file *file, char *buf, size_t size)
{
if (size == 0) {
int len = 0;
lock_kernel();
if (nfsd_serv)
len = svc_sock_names(buf, nfsd_serv, NULL);
unlock_kernel();
return len;
}
/* Either a single 'fd' number is written, in which
* case it must be for a socket of a supported family/protocol,
* and we use it as an nfsd socket, or
* A '-' followed by the 'name' of a socket in which case
* we close the socket.
*/
if (isdigit(buf[0])) {
char *mesg = buf;
int fd;
int err;
err = get_int(&mesg, &fd);
if (err)
return -EINVAL;
if (fd < 0)
return -EINVAL;
err = nfsd_create_serv();
if (!err) {
int proto = 0;
err = svc_addsock(nfsd_serv, fd, buf, &proto);
if (err >= 0) {
err = lockd_up(proto);
if (err < 0)
svc_sock_names(buf+strlen(buf)+1, nfsd_serv, buf);
}
/* Decrease the count, but don't shutdown the
* the service
*/
lock_kernel();
nfsd_serv->sv_nrthreads--;
unlock_kernel();
}
return err < 0 ? err : 0;
}
if (buf[0] == '-') {
char *toclose = kstrdup(buf+1, GFP_KERNEL);
int len = 0;
if (!toclose)
return -ENOMEM;
lock_kernel();
if (nfsd_serv)
len = svc_sock_names(buf, nfsd_serv, toclose);
unlock_kernel();
if (len >= 0)
lockd_down();
kfree(toclose);
return len;
}
return -EINVAL;
}
static int
reclaimer(void *ptr)
{
struct nlm_host *host = (struct nlm_host *) ptr;
struct nlm_wait *block;
struct list_head *tmp;
/* This one ensures that our parent doesn't terminate while the
* reclaim is in progress */
lock_kernel();
lockd_up();
/* First, reclaim all locks that have been granted previously. */
restart:
tmp = file_lock_list.next;
while (tmp != &file_lock_list) {
struct file_lock *fl = list_entry(tmp, struct file_lock, fl_link);
struct inode *inode = fl->fl_file->f_dentry->d_inode;
if (inode->i_sb->s_magic == NFS_SUPER_MAGIC &&
nlm_cmp_addr(NFS_ADDR(inode), &host->h_addr) &&
fl->fl_u.nfs_fl.state != host->h_state &&
(fl->fl_u.nfs_fl.flags & NFS_LCK_GRANTED)) {
fl->fl_u.nfs_fl.flags &= ~ NFS_LCK_GRANTED;
nlmclnt_reclaim(host, fl); /* This sleeps */
goto restart;
}
tmp = tmp->next;
}
host->h_reclaiming = 0;
wake_up(&host->h_gracewait);
/* Now, wake up all processes that sleep on a blocked lock */
for (block = nlm_blocked; block; block = block->b_next) {
if (block->b_host == host) {
block->b_status = NLM_LCK_DENIED_GRACE_PERIOD;
wake_up(&block->b_wait);
}
}
/* Release host handle after use */
nlm_release_host(host);
lockd_down();
unlock_kernel();
return 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;
}
/*
* This is the NFS server kernel thread
*/
static void
nfsd(struct svc_rqst *rqstp)
{
struct svc_serv *serv = rqstp->rq_server;
struct fs_struct *fsp;
int err;
struct nfsd_list me;
sigset_t shutdown_mask, allowed_mask;
/* Lock module and set up kernel thread */
lock_kernel();
daemonize("nfsd");
current->rlim[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY;
/* After daemonize() this kernel thread shares current->fs
* with the init process. We need to create files with a
* umask of 0 instead of init's umask. */
fsp = copy_fs_struct(current->fs);
if (!fsp) {
printk("Unable to start nfsd thread: out of memory\n");
goto out;
}
exit_fs(current);
current->fs = fsp;
current->fs->umask = 0;
siginitsetinv(&shutdown_mask, SHUTDOWN_SIGS);
siginitsetinv(&allowed_mask, ALLOWED_SIGS);
nfsdstats.th_cnt++;
lockd_up(); /* start lockd */
me.task = current;
list_add(&me.list, &nfsd_list);
unlock_kernel();
/*
* We want less throttling in balance_dirty_pages() so that nfs to
* localhost doesn't cause nfsd to lock up due to all the client's
* dirty pages.
*/
current->flags |= PF_LESS_THROTTLE;
/*
* The main request loop
*/
for (;;) {
/* Block all but the shutdown signals */
sigprocmask(SIG_SETMASK, &shutdown_mask, NULL);
/*
* Find a socket with data available and call its
* recvfrom routine.
*/
while ((err = svc_recv(serv, rqstp,
60*60*HZ)) == -EAGAIN)
;
if (err < 0)
break;
update_thread_usage(atomic_read(&nfsd_busy));
atomic_inc(&nfsd_busy);
/* Lock the export hash tables for reading. */
exp_readlock();
/* Process request with signals blocked. */
sigprocmask(SIG_SETMASK, &allowed_mask, NULL);
svc_process(serv, rqstp);
/* Unlock export hash tables */
exp_readunlock();
update_thread_usage(atomic_read(&nfsd_busy));
atomic_dec(&nfsd_busy);
}
if (err != -EINTR) {
printk(KERN_WARNING "nfsd: terminating on error %d\n", -err);
} else {
unsigned int signo;
for (signo = 1; signo <= _NSIG; signo++)
if (sigismember(¤t->pending.signal, signo) &&
!sigismember(¤t->blocked, signo))
break;
err = signo;
}
lock_kernel();
/* Release lockd */
lockd_down();
/* Check if this is last thread */
if (serv->sv_nrthreads==1) {
printk(KERN_WARNING "nfsd: last server has exited\n");
if (err != SIG_NOCLEAN) {
printk(KERN_WARNING "nfsd: unexporting all filesystems\n");
nfsd_export_flush();
}
nfsd_serv = NULL;
nfsd_racache_shutdown(); /* release read-ahead cache */
nfs4_state_shutdown();
}
list_del(&me.list);
nfsdstats.th_cnt --;
out:
/* Release the thread */
svc_exit_thread(rqstp);
/* Release module */
module_put_and_exit(0);
}
