v4.19.13 snapshot.
diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c
new file mode 100644
index 0000000..7fb9f7c
--- /dev/null
+++ b/fs/nfsd/nfsctl.c
@@ -0,0 +1,1339 @@
+/*
+ * Syscall interface to knfsd.
+ *
+ * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
+ */
+
+#include <linux/slab.h>
+#include <linux/namei.h>
+#include <linux/ctype.h>
+
+#include <linux/sunrpc/svcsock.h>
+#include <linux/lockd/lockd.h>
+#include <linux/sunrpc/addr.h>
+#include <linux/sunrpc/gss_api.h>
+#include <linux/sunrpc/gss_krb5_enctypes.h>
+#include <linux/sunrpc/rpc_pipe_fs.h>
+#include <linux/module.h>
+
+#include "idmap.h"
+#include "nfsd.h"
+#include "cache.h"
+#include "state.h"
+#include "netns.h"
+#include "pnfs.h"
+
+/*
+ * We have a single directory with several nodes in it.
+ */
+enum {
+ NFSD_Root = 1,
+ NFSD_List,
+ NFSD_Export_features,
+ NFSD_Fh,
+ NFSD_FO_UnlockIP,
+ NFSD_FO_UnlockFS,
+ NFSD_Threads,
+ NFSD_Pool_Threads,
+ NFSD_Pool_Stats,
+ NFSD_Reply_Cache_Stats,
+ NFSD_Versions,
+ NFSD_Ports,
+ NFSD_MaxBlkSize,
+ NFSD_MaxConnections,
+ NFSD_SupportedEnctypes,
+ /*
+ * The below MUST come last. Otherwise we leave a hole in nfsd_files[]
+ * with !CONFIG_NFSD_V4 and simple_fill_super() goes oops
+ */
+#ifdef CONFIG_NFSD_V4
+ NFSD_Leasetime,
+ NFSD_Gracetime,
+ NFSD_RecoveryDir,
+ NFSD_V4EndGrace,
+#endif
+};
+
+/*
+ * write() for these nodes.
+ */
+static ssize_t write_filehandle(struct file *file, char *buf, size_t size);
+static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size);
+static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size);
+static ssize_t write_threads(struct file *file, char *buf, size_t size);
+static ssize_t write_pool_threads(struct file *file, char *buf, size_t size);
+static ssize_t write_versions(struct file *file, char *buf, size_t size);
+static ssize_t write_ports(struct file *file, char *buf, size_t size);
+static ssize_t write_maxblksize(struct file *file, char *buf, size_t size);
+static ssize_t write_maxconn(struct file *file, char *buf, size_t size);
+#ifdef CONFIG_NFSD_V4
+static ssize_t write_leasetime(struct file *file, char *buf, size_t size);
+static ssize_t write_gracetime(struct file *file, char *buf, size_t size);
+static ssize_t write_recoverydir(struct file *file, char *buf, size_t size);
+static ssize_t write_v4_end_grace(struct file *file, char *buf, size_t size);
+#endif
+
+static ssize_t (*const write_op[])(struct file *, char *, size_t) = {
+ [NFSD_Fh] = write_filehandle,
+ [NFSD_FO_UnlockIP] = write_unlock_ip,
+ [NFSD_FO_UnlockFS] = write_unlock_fs,
+ [NFSD_Threads] = write_threads,
+ [NFSD_Pool_Threads] = write_pool_threads,
+ [NFSD_Versions] = write_versions,
+ [NFSD_Ports] = write_ports,
+ [NFSD_MaxBlkSize] = write_maxblksize,
+ [NFSD_MaxConnections] = write_maxconn,
+#ifdef CONFIG_NFSD_V4
+ [NFSD_Leasetime] = write_leasetime,
+ [NFSD_Gracetime] = write_gracetime,
+ [NFSD_RecoveryDir] = write_recoverydir,
+ [NFSD_V4EndGrace] = write_v4_end_grace,
+#endif
+};
+
+static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
+{
+ ino_t ino = file_inode(file)->i_ino;
+ char *data;
+ ssize_t rv;
+
+ if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
+ return -EINVAL;
+
+ data = simple_transaction_get(file, buf, size);
+ if (IS_ERR(data))
+ return PTR_ERR(data);
+
+ rv = write_op[ino](file, data, size);
+ if (rv >= 0) {
+ simple_transaction_set(file, rv);
+ rv = size;
+ }
+ return rv;
+}
+
+static ssize_t nfsctl_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos)
+{
+ if (! file->private_data) {
+ /* An attempt to read a transaction file without writing
+ * causes a 0-byte write so that the file can return
+ * state information
+ */
+ ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos);
+ if (rv < 0)
+ return rv;
+ }
+ return simple_transaction_read(file, buf, size, pos);
+}
+
+static const struct file_operations transaction_ops = {
+ .write = nfsctl_transaction_write,
+ .read = nfsctl_transaction_read,
+ .release = simple_transaction_release,
+ .llseek = default_llseek,
+};
+
+static int exports_net_open(struct net *net, struct file *file)
+{
+ int err;
+ struct seq_file *seq;
+ struct nfsd_net *nn = net_generic(net, nfsd_net_id);
+
+ err = seq_open(file, &nfs_exports_op);
+ if (err)
+ return err;
+
+ seq = file->private_data;
+ seq->private = nn->svc_export_cache;
+ return 0;
+}
+
+static int exports_proc_open(struct inode *inode, struct file *file)
+{
+ return exports_net_open(current->nsproxy->net_ns, file);
+}
+
+static const struct file_operations exports_proc_operations = {
+ .open = exports_proc_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = seq_release,
+};
+
+static int exports_nfsd_open(struct inode *inode, struct file *file)
+{
+ return exports_net_open(inode->i_sb->s_fs_info, file);
+}
+
+static const struct file_operations exports_nfsd_operations = {
+ .open = exports_nfsd_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = seq_release,
+};
+
+static int export_features_show(struct seq_file *m, void *v)
+{
+ seq_printf(m, "0x%x 0x%x\n", NFSEXP_ALLFLAGS, NFSEXP_SECINFO_FLAGS);
+ return 0;
+}
+
+static int export_features_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, export_features_show, NULL);
+}
+
+static const struct file_operations export_features_operations = {
+ .open = export_features_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
+#if defined(CONFIG_SUNRPC_GSS) || defined(CONFIG_SUNRPC_GSS_MODULE)
+static int supported_enctypes_show(struct seq_file *m, void *v)
+{
+ seq_printf(m, KRB5_SUPPORTED_ENCTYPES);
+ return 0;
+}
+
+static int supported_enctypes_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, supported_enctypes_show, NULL);
+}
+
+static const struct file_operations supported_enctypes_ops = {
+ .open = supported_enctypes_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+#endif /* CONFIG_SUNRPC_GSS or CONFIG_SUNRPC_GSS_MODULE */
+
+static const struct file_operations pool_stats_operations = {
+ .open = nfsd_pool_stats_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = nfsd_pool_stats_release,
+};
+
+static const struct file_operations reply_cache_stats_operations = {
+ .open = nfsd_reply_cache_stats_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
+/*----------------------------------------------------------------------------*/
+/*
+ * payload - write methods
+ */
+
+static inline struct net *netns(struct file *file)
+{
+ return file_inode(file)->i_sb->s_fs_info;
+}
+
+/**
+ * write_unlock_ip - Release all locks used by a client
+ *
+ * Experimental.
+ *
+ * Input:
+ * buf: '\n'-terminated C string containing a
+ * presentation format IP address
+ * size: length of C string in @buf
+ * Output:
+ * On success: returns zero if all specified locks were released;
+ * returns one if one or more locks were not released
+ * On error: return code is negative errno value
+ */
+static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size)
+{
+ struct sockaddr_storage address;
+ struct sockaddr *sap = (struct sockaddr *)&address;
+ size_t salen = sizeof(address);
+ char *fo_path;
+ struct net *net = netns(file);
+
+ /* sanity check */
+ if (size == 0)
+ return -EINVAL;
+
+ if (buf[size-1] != '\n')
+ return -EINVAL;
+
+ fo_path = buf;
+ if (qword_get(&buf, fo_path, size) < 0)
+ return -EINVAL;
+
+ if (rpc_pton(net, fo_path, size, sap, salen) == 0)
+ return -EINVAL;
+
+ return nlmsvc_unlock_all_by_ip(sap);
+}
+
+/**
+ * write_unlock_fs - Release all locks on a local file system
+ *
+ * Experimental.
+ *
+ * Input:
+ * buf: '\n'-terminated C string containing the
+ * absolute pathname of a local file system
+ * size: length of C string in @buf
+ * Output:
+ * On success: returns zero if all specified locks were released;
+ * returns one if one or more locks were not released
+ * On error: return code is negative errno value
+ */
+static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size)
+{
+ struct path path;
+ char *fo_path;
+ int error;
+
+ /* sanity check */
+ if (size == 0)
+ return -EINVAL;
+
+ if (buf[size-1] != '\n')
+ return -EINVAL;
+
+ fo_path = buf;
+ if (qword_get(&buf, fo_path, size) < 0)
+ return -EINVAL;
+
+ error = kern_path(fo_path, 0, &path);
+ if (error)
+ return error;
+
+ /*
+ * XXX: Needs better sanity checking. Otherwise we could end up
+ * releasing locks on the wrong file system.
+ *
+ * For example:
+ * 1. Does the path refer to a directory?
+ * 2. Is that directory a mount point, or
+ * 3. Is that directory the root of an exported file system?
+ */
+ error = nlmsvc_unlock_all_by_sb(path.dentry->d_sb);
+
+ path_put(&path);
+ return error;
+}
+
+/**
+ * write_filehandle - Get a variable-length NFS file handle by path
+ *
+ * On input, the buffer contains a '\n'-terminated C string comprised of
+ * three alphanumeric words separated by whitespace. The string may
+ * contain escape sequences.
+ *
+ * Input:
+ * buf:
+ * domain: client domain name
+ * path: export pathname
+ * maxsize: numeric maximum size of
+ * @buf
+ * size: length of C string in @buf
+ * Output:
+ * On success: passed-in buffer filled with '\n'-terminated C
+ * string containing a ASCII hex text version
+ * of the NFS file handle;
+ * return code is the size in bytes of the string
+ * On error: return code is negative errno value
+ */
+static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
+{
+ char *dname, *path;
+ int uninitialized_var(maxsize);
+ char *mesg = buf;
+ int len;
+ struct auth_domain *dom;
+ struct knfsd_fh fh;
+
+ if (size == 0)
+ return -EINVAL;
+
+ if (buf[size-1] != '\n')
+ return -EINVAL;
+ buf[size-1] = 0;
+
+ dname = mesg;
+ len = qword_get(&mesg, dname, size);
+ if (len <= 0)
+ return -EINVAL;
+
+ path = dname+len+1;
+ len = qword_get(&mesg, path, size);
+ if (len <= 0)
+ return -EINVAL;
+
+ len = get_int(&mesg, &maxsize);
+ if (len)
+ return len;
+
+ if (maxsize < NFS_FHSIZE)
+ return -EINVAL;
+ maxsize = min(maxsize, NFS3_FHSIZE);
+
+ if (qword_get(&mesg, mesg, size)>0)
+ return -EINVAL;
+
+ /* we have all the words, they are in buf.. */
+ dom = unix_domain_find(dname);
+ if (!dom)
+ return -ENOMEM;
+
+ len = exp_rootfh(netns(file), dom, path, &fh, maxsize);
+ auth_domain_put(dom);
+ if (len)
+ return len;
+
+ mesg = buf;
+ len = SIMPLE_TRANSACTION_LIMIT;
+ qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size);
+ mesg[-1] = '\n';
+ return mesg - buf;
+}
+
+/**
+ * write_threads - Start NFSD, or report the current number of running threads
+ *
+ * Input:
+ * buf: ignored
+ * size: zero
+ * Output:
+ * On success: passed-in buffer filled with '\n'-terminated C
+ * string numeric value representing the number of
+ * running NFSD threads;
+ * return code is the size in bytes of the string
+ * On error: return code is zero
+ *
+ * OR
+ *
+ * Input:
+ * buf: C string containing an unsigned
+ * integer value representing the
+ * number of NFSD threads to start
+ * size: non-zero length of C string in @buf
+ * Output:
+ * On success: NFS service is started;
+ * passed-in buffer filled with '\n'-terminated C
+ * string numeric value representing the number of
+ * running NFSD threads;
+ * return code is the size in bytes of the string
+ * On error: return code is zero or a negative errno value
+ */
+static ssize_t write_threads(struct file *file, char *buf, size_t size)
+{
+ char *mesg = buf;
+ int rv;
+ struct net *net = netns(file);
+
+ if (size > 0) {
+ int newthreads;
+ rv = get_int(&mesg, &newthreads);
+ if (rv)
+ return rv;
+ if (newthreads < 0)
+ return -EINVAL;
+ rv = nfsd_svc(newthreads, net);
+ if (rv < 0)
+ return rv;
+ } else
+ rv = nfsd_nrthreads(net);
+
+ return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n", rv);
+}
+
+/**
+ * write_pool_threads - Set or report the current number of threads per pool
+ *
+ * Input:
+ * buf: ignored
+ * size: zero
+ *
+ * OR
+ *
+ * Input:
+ * buf: C string containing whitespace-
+ * separated unsigned integer values
+ * representing the number of NFSD
+ * threads to start in each pool
+ * size: non-zero length of C string in @buf
+ * Output:
+ * On success: passed-in buffer filled with '\n'-terminated C
+ * string containing integer values representing the
+ * number of NFSD threads in each pool;
+ * return code is the size in bytes of the string
+ * On error: return code is zero or a negative errno value
+ */
+static ssize_t write_pool_threads(struct file *file, char *buf, size_t size)
+{
+ /* if size > 0, look for an array of number of threads per node
+ * and apply them then write out number of threads per node as reply
+ */
+ char *mesg = buf;
+ int i;
+ int rv;
+ int len;
+ int npools;
+ int *nthreads;
+ struct net *net = netns(file);
+
+ mutex_lock(&nfsd_mutex);
+ npools = nfsd_nrpools(net);
+ if (npools == 0) {
+ /*
+ * NFS is shut down. The admin can start it by
+ * writing to the threads file but NOT the pool_threads
+ * file, sorry. Report zero threads.
+ */
+ mutex_unlock(&nfsd_mutex);
+ strcpy(buf, "0\n");
+ return strlen(buf);
+ }
+
+ nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL);
+ rv = -ENOMEM;
+ if (nthreads == NULL)
+ goto out_free;
+
+ if (size > 0) {
+ for (i = 0; i < npools; i++) {
+ rv = get_int(&mesg, &nthreads[i]);
+ if (rv == -ENOENT)
+ break; /* fewer numbers than pools */
+ if (rv)
+ goto out_free; /* syntax error */
+ rv = -EINVAL;
+ if (nthreads[i] < 0)
+ goto out_free;
+ }
+ rv = nfsd_set_nrthreads(i, nthreads, net);
+ if (rv)
+ goto out_free;
+ }
+
+ rv = nfsd_get_nrthreads(npools, nthreads, net);
+ if (rv)
+ goto out_free;
+
+ mesg = buf;
+ size = SIMPLE_TRANSACTION_LIMIT;
+ for (i = 0; i < npools && size > 0; i++) {
+ snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' '));
+ len = strlen(mesg);
+ size -= len;
+ mesg += len;
+ }
+ rv = mesg - buf;
+out_free:
+ kfree(nthreads);
+ mutex_unlock(&nfsd_mutex);
+ return rv;
+}
+
+static ssize_t
+nfsd_print_version_support(char *buf, int remaining, const char *sep,
+ unsigned vers, int minor)
+{
+ const char *format = minor < 0 ? "%s%c%u" : "%s%c%u.%u";
+ bool supported = !!nfsd_vers(vers, NFSD_TEST);
+
+ if (vers == 4 && minor >= 0 &&
+ !nfsd_minorversion(minor, NFSD_TEST))
+ supported = false;
+ if (minor == 0 && supported)
+ /*
+ * special case for backward compatability.
+ * +4.0 is never reported, it is implied by
+ * +4, unless -4.0 is present.
+ */
+ return 0;
+ return snprintf(buf, remaining, format, sep,
+ supported ? '+' : '-', vers, minor);
+}
+
+static ssize_t __write_versions(struct file *file, char *buf, size_t size)
+{
+ char *mesg = buf;
+ char *vers, *minorp, sign;
+ int len, num, remaining;
+ ssize_t tlen = 0;
+ char *sep;
+ struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
+
+ if (size>0) {
+ if (nn->nfsd_serv)
+ /* Cannot change versions without updating
+ * nn->nfsd_serv->sv_xdrsize, and reallocing
+ * rq_argp and rq_resp
+ */
+ return -EBUSY;
+ if (buf[size-1] != '\n')
+ return -EINVAL;
+ buf[size-1] = 0;
+
+ vers = mesg;
+ len = qword_get(&mesg, vers, size);
+ if (len <= 0) return -EINVAL;
+ do {
+ enum vers_op cmd;
+ unsigned minor;
+ sign = *vers;
+ if (sign == '+' || sign == '-')
+ num = simple_strtol((vers+1), &minorp, 0);
+ else
+ num = simple_strtol(vers, &minorp, 0);
+ if (*minorp == '.') {
+ if (num != 4)
+ return -EINVAL;
+ if (kstrtouint(minorp+1, 0, &minor) < 0)
+ return -EINVAL;
+ }
+
+ cmd = sign == '-' ? NFSD_CLEAR : NFSD_SET;
+ switch(num) {
+ case 2:
+ case 3:
+ nfsd_vers(num, cmd);
+ break;
+ case 4:
+ if (*minorp == '.') {
+ if (nfsd_minorversion(minor, cmd) < 0)
+ return -EINVAL;
+ } else if ((cmd == NFSD_SET) != nfsd_vers(num, NFSD_TEST)) {
+ /*
+ * Either we have +4 and no minors are enabled,
+ * or we have -4 and at least one minor is enabled.
+ * In either case, propagate 'cmd' to all minors.
+ */
+ minor = 0;
+ while (nfsd_minorversion(minor, cmd) >= 0)
+ minor++;
+ }
+ break;
+ default:
+ return -EINVAL;
+ }
+ vers += len + 1;
+ } while ((len = qword_get(&mesg, vers, size)) > 0);
+ /* If all get turned off, turn them back on, as
+ * having no versions is BAD
+ */
+ nfsd_reset_versions();
+ }
+
+ /* Now write current state into reply buffer */
+ len = 0;
+ sep = "";
+ remaining = SIMPLE_TRANSACTION_LIMIT;
+ for (num=2 ; num <= 4 ; num++) {
+ int minor;
+ if (!nfsd_vers(num, NFSD_AVAIL))
+ continue;
+
+ minor = -1;
+ do {
+ len = nfsd_print_version_support(buf, remaining,
+ sep, num, minor);
+ if (len >= remaining)
+ goto out;
+ remaining -= len;
+ buf += len;
+ tlen += len;
+ minor++;
+ if (len)
+ sep = " ";
+ } while (num == 4 && minor <= NFSD_SUPPORTED_MINOR_VERSION);
+ }
+out:
+ len = snprintf(buf, remaining, "\n");
+ if (len >= remaining)
+ return -EINVAL;
+ return tlen + len;
+}
+
+/**
+ * write_versions - Set or report the available NFS protocol versions
+ *
+ * Input:
+ * buf: ignored
+ * size: zero
+ * Output:
+ * On success: passed-in buffer filled with '\n'-terminated C
+ * string containing positive or negative integer
+ * values representing the current status of each
+ * protocol version;
+ * return code is the size in bytes of the string
+ * On error: return code is zero or a negative errno value
+ *
+ * OR
+ *
+ * Input:
+ * buf: C string containing whitespace-
+ * separated positive or negative
+ * integer values representing NFS
+ * protocol versions to enable ("+n")
+ * or disable ("-n")
+ * size: non-zero length of C string in @buf
+ * Output:
+ * On success: status of zero or more protocol versions has
+ * been updated; passed-in buffer filled with
+ * '\n'-terminated C string containing positive
+ * or negative integer values representing the
+ * current status of each protocol version;
+ * return code is the size in bytes of the string
+ * On error: return code is zero or a negative errno value
+ */
+static ssize_t write_versions(struct file *file, char *buf, size_t size)
+{
+ ssize_t rv;
+
+ mutex_lock(&nfsd_mutex);
+ rv = __write_versions(file, buf, size);
+ mutex_unlock(&nfsd_mutex);
+ return rv;
+}
+
+/*
+ * Zero-length write. Return a list of NFSD's current listener
+ * transports.
+ */
+static ssize_t __write_ports_names(char *buf, struct net *net)
+{
+ struct nfsd_net *nn = net_generic(net, nfsd_net_id);
+
+ if (nn->nfsd_serv == NULL)
+ return 0;
+ return svc_xprt_names(nn->nfsd_serv, buf, SIMPLE_TRANSACTION_LIMIT);
+}
+
+/*
+ * A single 'fd' number was written, in which case it must be for
+ * a socket of a supported family/protocol, and we use it as an
+ * nfsd listener.
+ */
+static ssize_t __write_ports_addfd(char *buf, struct net *net)
+{
+ char *mesg = buf;
+ int fd, err;
+ struct nfsd_net *nn = net_generic(net, nfsd_net_id);
+
+ err = get_int(&mesg, &fd);
+ if (err != 0 || fd < 0)
+ return -EINVAL;
+
+ if (svc_alien_sock(net, fd)) {
+ printk(KERN_ERR "%s: socket net is different to NFSd's one\n", __func__);
+ return -EINVAL;
+ }
+
+ err = nfsd_create_serv(net);
+ if (err != 0)
+ return err;
+
+ err = svc_addsock(nn->nfsd_serv, fd, buf, SIMPLE_TRANSACTION_LIMIT);
+ if (err < 0) {
+ nfsd_destroy(net);
+ return err;
+ }
+
+ /* Decrease the count, but don't shut down the service */
+ nn->nfsd_serv->sv_nrthreads--;
+ return err;
+}
+
+/*
+ * A transport listener is added by writing it's transport name and
+ * a port number.
+ */
+static ssize_t __write_ports_addxprt(char *buf, struct net *net)
+{
+ char transport[16];
+ struct svc_xprt *xprt;
+ int port, err;
+ struct nfsd_net *nn = net_generic(net, nfsd_net_id);
+
+ if (sscanf(buf, "%15s %5u", transport, &port) != 2)
+ return -EINVAL;
+
+ if (port < 1 || port > USHRT_MAX)
+ return -EINVAL;
+
+ err = nfsd_create_serv(net);
+ if (err != 0)
+ return err;
+
+ err = svc_create_xprt(nn->nfsd_serv, transport, net,
+ PF_INET, port, SVC_SOCK_ANONYMOUS);
+ if (err < 0)
+ goto out_err;
+
+ err = svc_create_xprt(nn->nfsd_serv, transport, net,
+ PF_INET6, port, SVC_SOCK_ANONYMOUS);
+ if (err < 0 && err != -EAFNOSUPPORT)
+ goto out_close;
+
+ /* Decrease the count, but don't shut down the service */
+ nn->nfsd_serv->sv_nrthreads--;
+ return 0;
+out_close:
+ xprt = svc_find_xprt(nn->nfsd_serv, transport, net, PF_INET, port);
+ if (xprt != NULL) {
+ svc_close_xprt(xprt);
+ svc_xprt_put(xprt);
+ }
+out_err:
+ nfsd_destroy(net);
+ return err;
+}
+
+static ssize_t __write_ports(struct file *file, char *buf, size_t size,
+ struct net *net)
+{
+ if (size == 0)
+ return __write_ports_names(buf, net);
+
+ if (isdigit(buf[0]))
+ return __write_ports_addfd(buf, net);
+
+ if (isalpha(buf[0]))
+ return __write_ports_addxprt(buf, net);
+
+ return -EINVAL;
+}
+
+/**
+ * write_ports - Pass a socket file descriptor or transport name to listen on
+ *
+ * Input:
+ * buf: ignored
+ * size: zero
+ * Output:
+ * On success: passed-in buffer filled with a '\n'-terminated C
+ * string containing a whitespace-separated list of
+ * named NFSD listeners;
+ * return code is the size in bytes of the string
+ * On error: return code is zero or a negative errno value
+ *
+ * OR
+ *
+ * Input:
+ * buf: C string containing an unsigned
+ * integer value representing a bound
+ * but unconnected socket that is to be
+ * used as an NFSD listener; listen(3)
+ * must be called for a SOCK_STREAM
+ * socket, otherwise it is ignored
+ * size: non-zero length of C string in @buf
+ * Output:
+ * On success: NFS service is started;
+ * passed-in buffer filled with a '\n'-terminated C
+ * string containing a unique alphanumeric name of
+ * the listener;
+ * return code is the size in bytes of the string
+ * On error: return code is a negative errno value
+ *
+ * OR
+ *
+ * Input:
+ * buf: C string containing a transport
+ * name and an unsigned integer value
+ * representing the port to listen on,
+ * separated by whitespace
+ * size: non-zero length of C string in @buf
+ * Output:
+ * On success: returns zero; NFS service is started
+ * On error: return code is a negative errno value
+ */
+static ssize_t write_ports(struct file *file, char *buf, size_t size)
+{
+ ssize_t rv;
+
+ mutex_lock(&nfsd_mutex);
+ rv = __write_ports(file, buf, size, netns(file));
+ mutex_unlock(&nfsd_mutex);
+ return rv;
+}
+
+
+int nfsd_max_blksize;
+
+/**
+ * write_maxblksize - Set or report the current NFS blksize
+ *
+ * Input:
+ * buf: ignored
+ * size: zero
+ *
+ * OR
+ *
+ * Input:
+ * buf: C string containing an unsigned
+ * integer value representing the new
+ * NFS blksize
+ * size: non-zero length of C string in @buf
+ * Output:
+ * On success: passed-in buffer filled with '\n'-terminated C string
+ * containing numeric value of the current NFS blksize
+ * setting;
+ * return code is the size in bytes of the string
+ * On error: return code is zero or a negative errno value
+ */
+static ssize_t write_maxblksize(struct file *file, char *buf, size_t size)
+{
+ char *mesg = buf;
+ struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
+
+ if (size > 0) {
+ int bsize;
+ int rv = get_int(&mesg, &bsize);
+ if (rv)
+ return rv;
+ /* force bsize into allowed range and
+ * required alignment.
+ */
+ bsize = max_t(int, bsize, 1024);
+ bsize = min_t(int, bsize, NFSSVC_MAXBLKSIZE);
+ bsize &= ~(1024-1);
+ mutex_lock(&nfsd_mutex);
+ if (nn->nfsd_serv) {
+ mutex_unlock(&nfsd_mutex);
+ return -EBUSY;
+ }
+ nfsd_max_blksize = bsize;
+ mutex_unlock(&nfsd_mutex);
+ }
+
+ return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n",
+ nfsd_max_blksize);
+}
+
+/**
+ * write_maxconn - Set or report the current max number of connections
+ *
+ * Input:
+ * buf: ignored
+ * size: zero
+ * OR
+ *
+ * Input:
+ * buf: C string containing an unsigned
+ * integer value representing the new
+ * number of max connections
+ * size: non-zero length of C string in @buf
+ * Output:
+ * On success: passed-in buffer filled with '\n'-terminated C string
+ * containing numeric value of max_connections setting
+ * for this net namespace;
+ * return code is the size in bytes of the string
+ * On error: return code is zero or a negative errno value
+ */
+static ssize_t write_maxconn(struct file *file, char *buf, size_t size)
+{
+ char *mesg = buf;
+ struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
+ unsigned int maxconn = nn->max_connections;
+
+ if (size > 0) {
+ int rv = get_uint(&mesg, &maxconn);
+
+ if (rv)
+ return rv;
+ nn->max_connections = maxconn;
+ }
+
+ return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%u\n", maxconn);
+}
+
+#ifdef CONFIG_NFSD_V4
+static ssize_t __nfsd4_write_time(struct file *file, char *buf, size_t size,
+ time_t *time, struct nfsd_net *nn)
+{
+ char *mesg = buf;
+ int rv, i;
+
+ if (size > 0) {
+ if (nn->nfsd_serv)
+ return -EBUSY;
+ rv = get_int(&mesg, &i);
+ if (rv)
+ return rv;
+ /*
+ * Some sanity checking. We don't have a reason for
+ * these particular numbers, but problems with the
+ * extremes are:
+ * - Too short: the briefest network outage may
+ * cause clients to lose all their locks. Also,
+ * the frequent polling may be wasteful.
+ * - Too long: do you really want reboot recovery
+ * to take more than an hour? Or to make other
+ * clients wait an hour before being able to
+ * revoke a dead client's locks?
+ */
+ if (i < 10 || i > 3600)
+ return -EINVAL;
+ *time = i;
+ }
+
+ return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%ld\n", *time);
+}
+
+static ssize_t nfsd4_write_time(struct file *file, char *buf, size_t size,
+ time_t *time, struct nfsd_net *nn)
+{
+ ssize_t rv;
+
+ mutex_lock(&nfsd_mutex);
+ rv = __nfsd4_write_time(file, buf, size, time, nn);
+ mutex_unlock(&nfsd_mutex);
+ return rv;
+}
+
+/**
+ * write_leasetime - Set or report the current NFSv4 lease time
+ *
+ * Input:
+ * buf: ignored
+ * size: zero
+ *
+ * OR
+ *
+ * Input:
+ * buf: C string containing an unsigned
+ * integer value representing the new
+ * NFSv4 lease expiry time
+ * size: non-zero length of C string in @buf
+ * Output:
+ * On success: passed-in buffer filled with '\n'-terminated C
+ * string containing unsigned integer value of the
+ * current lease expiry time;
+ * return code is the size in bytes of the string
+ * On error: return code is zero or a negative errno value
+ */
+static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
+{
+ struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
+ return nfsd4_write_time(file, buf, size, &nn->nfsd4_lease, nn);
+}
+
+/**
+ * write_gracetime - Set or report current NFSv4 grace period time
+ *
+ * As above, but sets the time of the NFSv4 grace period.
+ *
+ * Note this should never be set to less than the *previous*
+ * lease-period time, but we don't try to enforce this. (In the common
+ * case (a new boot), we don't know what the previous lease time was
+ * anyway.)
+ */
+static ssize_t write_gracetime(struct file *file, char *buf, size_t size)
+{
+ struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
+ return nfsd4_write_time(file, buf, size, &nn->nfsd4_grace, nn);
+}
+
+static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size,
+ struct nfsd_net *nn)
+{
+ char *mesg = buf;
+ char *recdir;
+ int len, status;
+
+ if (size > 0) {
+ if (nn->nfsd_serv)
+ return -EBUSY;
+ if (size > PATH_MAX || buf[size-1] != '\n')
+ return -EINVAL;
+ buf[size-1] = 0;
+
+ recdir = mesg;
+ len = qword_get(&mesg, recdir, size);
+ if (len <= 0)
+ return -EINVAL;
+
+ status = nfs4_reset_recoverydir(recdir);
+ if (status)
+ return status;
+ }
+
+ return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%s\n",
+ nfs4_recoverydir());
+}
+
+/**
+ * write_recoverydir - Set or report the pathname of the recovery directory
+ *
+ * Input:
+ * buf: ignored
+ * size: zero
+ *
+ * OR
+ *
+ * Input:
+ * buf: C string containing the pathname
+ * of the directory on a local file
+ * system containing permanent NFSv4
+ * recovery data
+ * size: non-zero length of C string in @buf
+ * Output:
+ * On success: passed-in buffer filled with '\n'-terminated C string
+ * containing the current recovery pathname setting;
+ * return code is the size in bytes of the string
+ * On error: return code is zero or a negative errno value
+ */
+static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
+{
+ ssize_t rv;
+ struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
+
+ mutex_lock(&nfsd_mutex);
+ rv = __write_recoverydir(file, buf, size, nn);
+ mutex_unlock(&nfsd_mutex);
+ return rv;
+}
+
+/**
+ * write_v4_end_grace - release grace period for nfsd's v4.x lock manager
+ *
+ * Input:
+ * buf: ignored
+ * size: zero
+ * OR
+ *
+ * Input:
+ * buf: any value
+ * size: non-zero length of C string in @buf
+ * Output:
+ * passed-in buffer filled with "Y" or "N" with a newline
+ * and NULL-terminated C string. This indicates whether
+ * the grace period has ended in the current net
+ * namespace. Return code is the size in bytes of the
+ * string. Writing a string that starts with 'Y', 'y', or
+ * '1' to the file will end the grace period for nfsd's v4
+ * lock manager.
+ */
+static ssize_t write_v4_end_grace(struct file *file, char *buf, size_t size)
+{
+ struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id);
+
+ if (size > 0) {
+ switch(buf[0]) {
+ case 'Y':
+ case 'y':
+ case '1':
+ nfsd4_end_grace(nn);
+ break;
+ default:
+ return -EINVAL;
+ }
+ }
+
+ return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%c\n",
+ nn->grace_ended ? 'Y' : 'N');
+}
+
+#endif
+
+/*----------------------------------------------------------------------------*/
+/*
+ * populating the filesystem.
+ */
+
+static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
+{
+ static const struct tree_descr nfsd_files[] = {
+ [NFSD_List] = {"exports", &exports_nfsd_operations, S_IRUGO},
+ [NFSD_Export_features] = {"export_features",
+ &export_features_operations, S_IRUGO},
+ [NFSD_FO_UnlockIP] = {"unlock_ip",
+ &transaction_ops, S_IWUSR|S_IRUSR},
+ [NFSD_FO_UnlockFS] = {"unlock_filesystem",
+ &transaction_ops, S_IWUSR|S_IRUSR},
+ [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
+ [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
+ [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR},
+ [NFSD_Pool_Stats] = {"pool_stats", &pool_stats_operations, S_IRUGO},
+ [NFSD_Reply_Cache_Stats] = {"reply_cache_stats", &reply_cache_stats_operations, S_IRUGO},
+ [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
+ [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
+ [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO},
+ [NFSD_MaxConnections] = {"max_connections", &transaction_ops, S_IWUSR|S_IRUGO},
+#if defined(CONFIG_SUNRPC_GSS) || defined(CONFIG_SUNRPC_GSS_MODULE)
+ [NFSD_SupportedEnctypes] = {"supported_krb5_enctypes", &supported_enctypes_ops, S_IRUGO},
+#endif /* CONFIG_SUNRPC_GSS or CONFIG_SUNRPC_GSS_MODULE */
+#ifdef CONFIG_NFSD_V4
+ [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
+ [NFSD_Gracetime] = {"nfsv4gracetime", &transaction_ops, S_IWUSR|S_IRUSR},
+ [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
+ [NFSD_V4EndGrace] = {"v4_end_grace", &transaction_ops, S_IWUSR|S_IRUGO},
+#endif
+ /* last one */ {""}
+ };
+ get_net(sb->s_fs_info);
+ return simple_fill_super(sb, 0x6e667364, nfsd_files);
+}
+
+static struct dentry *nfsd_mount(struct file_system_type *fs_type,
+ int flags, const char *dev_name, void *data)
+{
+ struct net *net = current->nsproxy->net_ns;
+ return mount_ns(fs_type, flags, data, net, net->user_ns, nfsd_fill_super);
+}
+
+static void nfsd_umount(struct super_block *sb)
+{
+ struct net *net = sb->s_fs_info;
+
+ kill_litter_super(sb);
+ put_net(net);
+}
+
+static struct file_system_type nfsd_fs_type = {
+ .owner = THIS_MODULE,
+ .name = "nfsd",
+ .mount = nfsd_mount,
+ .kill_sb = nfsd_umount,
+};
+MODULE_ALIAS_FS("nfsd");
+
+#ifdef CONFIG_PROC_FS
+static int create_proc_exports_entry(void)
+{
+ struct proc_dir_entry *entry;
+
+ entry = proc_mkdir("fs/nfs", NULL);
+ if (!entry)
+ return -ENOMEM;
+ entry = proc_create("exports", 0, entry,
+ &exports_proc_operations);
+ if (!entry) {
+ remove_proc_entry("fs/nfs", NULL);
+ return -ENOMEM;
+ }
+ return 0;
+}
+#else /* CONFIG_PROC_FS */
+static int create_proc_exports_entry(void)
+{
+ return 0;
+}
+#endif
+
+unsigned int nfsd_net_id;
+
+static __net_init int nfsd_init_net(struct net *net)
+{
+ int retval;
+ struct nfsd_net *nn = net_generic(net, nfsd_net_id);
+
+ retval = nfsd_export_init(net);
+ if (retval)
+ goto out_export_error;
+ retval = nfsd_idmap_init(net);
+ if (retval)
+ goto out_idmap_error;
+ nn->nfsd4_lease = 45; /* default lease time */
+ nn->nfsd4_grace = 45;
+ nn->somebody_reclaimed = false;
+ nn->clverifier_counter = prandom_u32();
+ nn->clientid_counter = prandom_u32();
+
+ atomic_set(&nn->ntf_refcnt, 0);
+ init_waitqueue_head(&nn->ntf_wq);
+ return 0;
+
+out_idmap_error:
+ nfsd_export_shutdown(net);
+out_export_error:
+ return retval;
+}
+
+static __net_exit void nfsd_exit_net(struct net *net)
+{
+ nfsd_idmap_shutdown(net);
+ nfsd_export_shutdown(net);
+}
+
+static struct pernet_operations nfsd_net_ops = {
+ .init = nfsd_init_net,
+ .exit = nfsd_exit_net,
+ .id = &nfsd_net_id,
+ .size = sizeof(struct nfsd_net),
+};
+
+static int __init init_nfsd(void)
+{
+ int retval;
+ printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");
+
+ retval = register_pernet_subsys(&nfsd_net_ops);
+ if (retval < 0)
+ return retval;
+ retval = register_cld_notifier();
+ if (retval)
+ goto out_unregister_pernet;
+ retval = nfsd4_init_slabs();
+ if (retval)
+ goto out_unregister_notifier;
+ retval = nfsd4_init_pnfs();
+ if (retval)
+ goto out_free_slabs;
+ retval = nfsd_fault_inject_init(); /* nfsd fault injection controls */
+ if (retval)
+ goto out_exit_pnfs;
+ nfsd_stat_init(); /* Statistics */
+ retval = nfsd_reply_cache_init();
+ if (retval)
+ goto out_free_stat;
+ nfsd_lockd_init(); /* lockd->nfsd callbacks */
+ retval = create_proc_exports_entry();
+ if (retval)
+ goto out_free_lockd;
+ retval = register_filesystem(&nfsd_fs_type);
+ if (retval)
+ goto out_free_all;
+ return 0;
+out_free_all:
+ remove_proc_entry("fs/nfs/exports", NULL);
+ remove_proc_entry("fs/nfs", NULL);
+out_free_lockd:
+ nfsd_lockd_shutdown();
+ nfsd_reply_cache_shutdown();
+out_free_stat:
+ nfsd_stat_shutdown();
+ nfsd_fault_inject_cleanup();
+out_exit_pnfs:
+ nfsd4_exit_pnfs();
+out_free_slabs:
+ nfsd4_free_slabs();
+out_unregister_notifier:
+ unregister_cld_notifier();
+out_unregister_pernet:
+ unregister_pernet_subsys(&nfsd_net_ops);
+ return retval;
+}
+
+static void __exit exit_nfsd(void)
+{
+ nfsd_reply_cache_shutdown();
+ remove_proc_entry("fs/nfs/exports", NULL);
+ remove_proc_entry("fs/nfs", NULL);
+ nfsd_stat_shutdown();
+ nfsd_lockd_shutdown();
+ nfsd4_free_slabs();
+ nfsd4_exit_pnfs();
+ nfsd_fault_inject_cleanup();
+ unregister_filesystem(&nfsd_fs_type);
+ unregister_cld_notifier();
+ unregister_pernet_subsys(&nfsd_net_ops);
+}
+
+MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
+MODULE_LICENSE("GPL");
+module_init(init_nfsd)
+module_exit(exit_nfsd)