/* * 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/nfsd_idmap.h> #include <linux/sunrpc/svcsock.h> #include <linux/nfsd/syscall.h> #include <linux/lockd/lockd.h> #include <linux/sunrpc/clnt.h> #include "nfsd.h" #include "cache.h" /* * We have a single directory with 9 nodes in it. */ enum { NFSD_Root = 1, NFSD_Svc, NFSD_Add, NFSD_Del, NFSD_Export, NFSD_Unexport, NFSD_Getfd, NFSD_Getfs, NFSD_List, NFSD_Export_features, NFSD_Fh, NFSD_FO_UnlockIP, NFSD_FO_UnlockFS, NFSD_Threads, NFSD_Pool_Threads, NFSD_Pool_Stats, NFSD_Versions, NFSD_Ports, NFSD_MaxBlkSize, /* * 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, #endif }; /* * write() for these nodes. */ static ssize_t write_svc(struct file *file, char *buf, size_t size); static ssize_t write_add(struct file *file, char *buf, size_t size); static ssize_t write_del(struct file *file, char *buf, size_t size); static ssize_t write_export(struct file *file, char *buf, size_t size); static ssize_t write_unexport(struct file *file, char *buf, size_t size); static ssize_t write_getfd(struct file *file, char *buf, size_t size); static ssize_t write_getfs(struct file *file, char *buf, size_t size); 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); #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); #endif static ssize_t (*write_op[])(struct file *, char *, size_t) = { [NFSD_Svc] = write_svc, [NFSD_Add] = write_add, [NFSD_Del] = write_del, [NFSD_Export] = write_export, [NFSD_Unexport] = write_unexport, [NFSD_Getfd] = write_getfd, [NFSD_Getfs] = write_getfs, [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, #ifdef CONFIG_NFSD_V4 [NFSD_Leasetime] = write_leasetime, [NFSD_Gracetime] = write_gracetime, [NFSD_RecoveryDir] = write_recoverydir, #endif }; static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos) { ino_t ino = file->f_path.dentry->d_inode->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, }; static int exports_open(struct inode *inode, struct file *file) { return seq_open(file, &nfs_exports_op); } static const struct file_operations exports_operations = { .open = exports_open, .read = seq_read, .llseek = seq_lseek, .release = seq_release, .owner = THIS_MODULE, }; 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 struct file_operations export_features_operations = { .open = export_features_open, .read = seq_read, .llseek = seq_lseek, .release = single_release, }; extern int nfsd_pool_stats_open(struct inode *inode, struct file *file); extern int nfsd_pool_stats_release(struct inode *inode, struct file *file); static const struct file_operations pool_stats_operations = { .open = nfsd_pool_stats_open, .read = seq_read, .llseek = seq_lseek, .release = nfsd_pool_stats_release, .owner = THIS_MODULE, }; /*----------------------------------------------------------------------------*/ /* * payload - write methods */ /** * write_svc - Start kernel's NFSD server * * Deprecated. /proc/fs/nfsd/threads is preferred. * Function remains to support old versions of nfs-utils. * * Input: * buf: struct nfsctl_svc * svc_port: port number of this * server's listener * svc_nthreads: number of threads to start * size: size in bytes of passed in nfsctl_svc * Output: * On success: returns zero * On error: return code is negative errno value */ static ssize_t write_svc(struct file *file, char *buf, size_t size) { struct nfsctl_svc *data; int err; if (size < sizeof(*data)) return -EINVAL; data = (struct nfsctl_svc*) buf; err = nfsd_svc(data->svc_port, data->svc_nthreads); if (err < 0) return err; return 0; } /** * write_add - Add or modify client entry in auth unix cache * * Deprecated. /proc/net/rpc/auth.unix.ip is preferred. * Function remains to support old versions of nfs-utils. * * Input: * buf: struct nfsctl_client * cl_ident: '\0'-terminated C string * containing domain name * of client * cl_naddr: no. of items in cl_addrlist * cl_addrlist: array of client addresses * cl_fhkeytype: ignored * cl_fhkeylen: ignored * cl_fhkey: ignored * size: size in bytes of passed in nfsctl_client * Output: * On success: returns zero * On error: return code is negative errno value * * Note: Only AF_INET client addresses are passed in, since * nfsctl_client.cl_addrlist contains only in_addr fields for addresses. */ static ssize_t write_add(struct file *file, char *buf, size_t size) { struct nfsctl_client *data; if (size < sizeof(*data)) return -EINVAL; data = (struct nfsctl_client *)buf; return exp_addclient(data); } /** * write_del - Remove client from auth unix cache * * Deprecated. /proc/net/rpc/auth.unix.ip is preferred. * Function remains to support old versions of nfs-utils. * * Input: * buf: struct nfsctl_client * cl_ident: '\0'-terminated C string * containing domain name * of client * cl_naddr: ignored * cl_addrlist: ignored * cl_fhkeytype: ignored * cl_fhkeylen: ignored * cl_fhkey: ignored * size: size in bytes of passed in nfsctl_client * Output: * On success: returns zero * On error: return code is negative errno value * * Note: Only AF_INET client addresses are passed in, since * nfsctl_client.cl_addrlist contains only in_addr fields for addresses. */ static ssize_t write_del(struct file *file, char *buf, size_t size) { struct nfsctl_client *data; if (size < sizeof(*data)) return -EINVAL; data = (struct nfsctl_client *)buf; return exp_delclient(data); } /** * write_export - Export part or all of a local file system * * Deprecated. /proc/net/rpc/{nfsd.export,nfsd.fh} are preferred. * Function remains to support old versions of nfs-utils. * * Input: * buf: struct nfsctl_export * ex_client: '\0'-terminated C string * containing domain name * of client allowed to access * this export * ex_path: '\0'-terminated C string * containing pathname of * directory in local file system * ex_dev: fsid to use for this export * ex_ino: ignored * ex_flags: export flags for this export * ex_anon_uid: UID to use for anonymous * requests * ex_anon_gid: GID to use for anonymous * requests * size: size in bytes of passed in nfsctl_export * Output: * On success: returns zero * On error: return code is negative errno value */ static ssize_t write_export(struct file *file, char *buf, size_t size) { struct nfsctl_export *data; if (size < sizeof(*data)) return -EINVAL; data = (struct nfsctl_export*)buf; return exp_export(data); } /** * write_unexport - Unexport a previously exported file system * * Deprecated. /proc/net/rpc/{nfsd.export,nfsd.fh} are preferred. * Function remains to support old versions of nfs-utils. * * Input: * buf: struct nfsctl_export * ex_client: '\0'-terminated C string * containing domain name * of client no longer allowed * to access this export * ex_path: '\0'-terminated C string * containing pathname of * directory in local file system * ex_dev: ignored * ex_ino: ignored * ex_flags: ignored * ex_anon_uid: ignored * ex_anon_gid: ignored * size: size in bytes of passed in nfsctl_export * Output: * On success: returns zero * On error: return code is negative errno value */ static ssize_t write_unexport(struct file *file, char *buf, size_t size) { struct nfsctl_export *data; if (size < sizeof(*data)) return -EINVAL; data = (struct nfsctl_export*)buf; return exp_unexport(data); } /** * write_getfs - Get a variable-length NFS file handle by path * * Deprecated. /proc/fs/nfsd/filehandle is preferred. * Function remains to support old versions of nfs-utils. * * Input: * buf: struct nfsctl_fsparm * gd_addr: socket address of client * gd_path: '\0'-terminated C string * containing pathname of * directory in local file system * gd_maxlen: maximum size of returned file * handle * size: size in bytes of passed in nfsctl_fsparm * Output: * On success: passed-in buffer filled with a knfsd_fh structure * (a variable-length raw NFS file handle); * return code is the size in bytes of the file handle * On error: return code is negative errno value * * Note: Only AF_INET client addresses are passed in, since gd_addr * is the same size as a struct sockaddr_in. */ static ssize_t write_getfs(struct file *file, char *buf, size_t size) { struct nfsctl_fsparm *data; struct sockaddr_in *sin; struct auth_domain *clp; int err = 0; struct knfsd_fh *res; struct in6_addr in6; if (size < sizeof(*data)) return -EINVAL; data = (struct nfsctl_fsparm*)buf; err = -EPROTONOSUPPORT; if (data->gd_addr.sa_family != AF_INET) goto out; sin = (struct sockaddr_in *)&data->gd_addr; if (data->gd_maxlen > NFS3_FHSIZE) data->gd_maxlen = NFS3_FHSIZE; res = (struct knfsd_fh*)buf; exp_readlock(); ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &in6); clp = auth_unix_lookup(&in6); if (!clp) err = -EPERM; else { err = exp_rootfh(clp, data->gd_path, res, data->gd_maxlen); auth_domain_put(clp); } exp_readunlock(); if (err == 0) err = res->fh_size + offsetof(struct knfsd_fh, fh_base); out: return err; } /** * write_getfd - Get a fixed-length NFS file handle by path (used by mountd) * * Deprecated. /proc/fs/nfsd/filehandle is preferred. * Function remains to support old versions of nfs-utils. * * Input: * buf: struct nfsctl_fdparm * gd_addr: socket address of client * gd_path: '\0'-terminated C string * containing pathname of * directory in local file system * gd_version: fdparm structure version * size: size in bytes of passed in nfsctl_fdparm * Output: * On success: passed-in buffer filled with nfsctl_res * (a fixed-length raw NFS file handle); * return code is the size in bytes of the file handle * On error: return code is negative errno value * * Note: Only AF_INET client addresses are passed in, since gd_addr * is the same size as a struct sockaddr_in. */ static ssize_t write_getfd(struct file *file, char *buf, size_t size) { struct nfsctl_fdparm *data; struct sockaddr_in *sin; struct auth_domain *clp; int err = 0; struct knfsd_fh fh; char *res; struct in6_addr in6; if (size < sizeof(*data)) return -EINVAL; data = (struct nfsctl_fdparm*)buf; err = -EPROTONOSUPPORT; if (data->gd_addr.sa_family != AF_INET) goto out; err = -EINVAL; if (data->gd_version < 2 || data->gd_version > NFSSVC_MAXVERS) goto out; res = buf; sin = (struct sockaddr_in *)&data->gd_addr; exp_readlock(); ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &in6); clp = auth_unix_lookup(&in6); if (!clp) err = -EPERM; else { err = exp_rootfh(clp, data->gd_path, &fh, NFS_FHSIZE); auth_domain_put(clp); } exp_readunlock(); if (err == 0) { memset(res,0, NFS_FHSIZE); memcpy(res, &fh.fh_base, fh.fh_size); err = NFS_FHSIZE; } out: return err; } /** * 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; /* 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(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.mnt->mnt_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; if (maxsize > NFS3_FHSIZE) 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(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; if (size > 0) { int newthreads; rv = get_int(&mesg, &newthreads); if (rv) return rv; if (newthreads < 0) return -EINVAL; rv = nfsd_svc(NFS_PORT, newthreads); if (rv < 0) return rv; } else rv = nfsd_nrthreads(); 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; mutex_lock(&nfsd_mutex); npools = nfsd_nrpools(); 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); if (rv) goto out_free; } rv = nfsd_get_nrthreads(npools, nthreads); 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 __write_versions(struct file *file, char *buf, size_t size) { char *mesg = buf; char *vers, *minorp, sign; int len, num, remaining; unsigned minor; ssize_t tlen = 0; char *sep; if (size>0) { if (nfsd_serv) /* Cannot change versions without updating * 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 { 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; minor = simple_strtoul(minorp+1, NULL, 0); if (minor == 0) return -EINVAL; if (nfsd_minorversion(minor, sign == '-' ? NFSD_CLEAR : NFSD_SET) < 0) return -EINVAL; goto next; } switch(num) { case 2: case 3: case 4: nfsd_vers(num, sign == '-' ? NFSD_CLEAR : NFSD_SET); break; default: return -EINVAL; } next: 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++) if (nfsd_vers(num, NFSD_AVAIL)) { len = snprintf(buf, remaining, "%s%c%d", sep, nfsd_vers(num, NFSD_TEST)?'+':'-', num); sep = " "; if (len > remaining) break; remaining -= len; buf += len; tlen += len; } if (nfsd_vers(4, NFSD_AVAIL)) for (minor = 1; minor <= NFSD_SUPPORTED_MINOR_VERSION; minor++) { len = snprintf(buf, remaining, " %c4.%u", (nfsd_vers(4, NFSD_TEST) && nfsd_minorversion(minor, NFSD_TEST)) ? '+' : '-', minor); if (len > remaining) break; remaining -= len; buf += len; tlen += len; } 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) { if (nfsd_serv == NULL) return 0; return svc_xprt_names(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) { char *mesg = buf; int fd, err; err = get_int(&mesg, &fd); if (err != 0 || fd < 0) return -EINVAL; err = nfsd_create_serv(); if (err != 0) return err; err = svc_addsock(nfsd_serv, fd, buf, SIMPLE_TRANSACTION_LIMIT); if (err < 0) { svc_destroy(nfsd_serv); return err; } /* Decrease the count, but don't shut down the service */ nfsd_serv->sv_nrthreads--; return err; } /* * A '-' followed by the 'name' of a socket means we close the socket. */ static ssize_t __write_ports_delfd(char *buf) { char *toclose; int len = 0; toclose = kstrdup(buf + 1, GFP_KERNEL); if (toclose == NULL) return -ENOMEM; if (nfsd_serv != NULL) len = svc_sock_names(nfsd_serv, buf, SIMPLE_TRANSACTION_LIMIT, toclose); kfree(toclose); return len; } /* * A transport listener is added by writing it's transport name and * a port number. */ static ssize_t __write_ports_addxprt(char *buf) { char transport[16]; struct svc_xprt *xprt; int port, err; if (sscanf(buf, "%15s %4u", transport, &port) != 2) return -EINVAL; if (port < 1 || port > USHRT_MAX) return -EINVAL; err = nfsd_create_serv(); if (err != 0) return err; err = svc_create_xprt(nfsd_serv, transport, PF_INET, port, SVC_SOCK_ANONYMOUS); if (err < 0) goto out_err; err = svc_create_xprt(nfsd_serv, transport, PF_INET6, port, SVC_SOCK_ANONYMOUS); if (err < 0 && err != -EAFNOSUPPORT) goto out_close; /* Decrease the count, but don't shut down the service */ nfsd_serv->sv_nrthreads--; return 0; out_close: xprt = svc_find_xprt(nfsd_serv, transport, PF_INET, port); if (xprt != NULL) { svc_close_xprt(xprt); svc_xprt_put(xprt); } out_err: svc_destroy(nfsd_serv); return err; } /* * A transport listener is removed by writing a "-", it's transport * name, and it's port number. */ static ssize_t __write_ports_delxprt(char *buf) { struct svc_xprt *xprt; char transport[16]; int port; if (sscanf(&buf[1], "%15s %4u", transport, &port) != 2) return -EINVAL; if (port < 1 || port > USHRT_MAX || nfsd_serv == NULL) return -EINVAL; xprt = svc_find_xprt(nfsd_serv, transport, AF_UNSPEC, port); if (xprt == NULL) return -ENOTCONN; svc_close_xprt(xprt); svc_xprt_put(xprt); return 0; } static ssize_t __write_ports(struct file *file, char *buf, size_t size) { if (size == 0) return __write_ports_names(buf); if (isdigit(buf[0])) return __write_ports_addfd(buf); if (buf[0] == '-' && isdigit(buf[1])) return __write_ports_delfd(buf); if (isalpha(buf[0])) return __write_ports_addxprt(buf); if (buf[0] == '-' && isalpha(buf[1])) return __write_ports_delxprt(buf); 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 "-" followed * by an integer value representing a * previously passed in socket file * descriptor * size: non-zero length of C string in @buf * Output: * On success: NFS service no longer listens on that socket; * passed-in buffer filled with a '\n'-terminated C * string containing a unique 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 * * OR * * Input: * buf: C string containing a "-" followed * by 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 no longer listens * on that transport * 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); 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; if (size > 0) { int bsize; int rv = get_int(&mesg, &bsize); if (rv) return rv; /* force bsize into allowed range and * required alignment. */ if (bsize < 1024) bsize = 1024; if (bsize > NFSSVC_MAXBLKSIZE) bsize = NFSSVC_MAXBLKSIZE; bsize &= ~(1024-1); mutex_lock(&nfsd_mutex); if (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); } #ifdef CONFIG_NFSD_V4 static ssize_t __nfsd4_write_time(struct file *file, char *buf, size_t size, time_t *time) { char *mesg = buf; int rv, i; if (size > 0) { if (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) { ssize_t rv; mutex_lock(&nfsd_mutex); rv = __nfsd4_write_time(file, buf, size, time); 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) { return nfsd4_write_time(file, buf, size, &nfsd4_lease); } /** * 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) { return nfsd4_write_time(file, buf, size, &nfsd4_grace); } extern char *nfs4_recoverydir(void); static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size) { char *mesg = buf; char *recdir; int len, status; if (size > 0) { if (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; mutex_lock(&nfsd_mutex); rv = __write_recoverydir(file, buf, size); mutex_unlock(&nfsd_mutex); return rv; } #endif /*----------------------------------------------------------------------------*/ /* * populating the filesystem. */ static int nfsd_fill_super(struct super_block * sb, void * data, int silent) { static struct tree_descr nfsd_files[] = { [NFSD_Svc] = {".svc", &transaction_ops, S_IWUSR}, [NFSD_Add] = {".add", &transaction_ops, S_IWUSR}, [NFSD_Del] = {".del", &transaction_ops, S_IWUSR}, [NFSD_Export] = {".export", &transaction_ops, S_IWUSR}, [NFSD_Unexport] = {".unexport", &transaction_ops, S_IWUSR}, [NFSD_Getfd] = {".getfd", &transaction_ops, S_IWUSR|S_IRUSR}, [NFSD_Getfs] = {".getfs", &transaction_ops, S_IWUSR|S_IRUSR}, [NFSD_List] = {"exports", &exports_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_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}, #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}, #endif /* last one */ {""} }; return simple_fill_super(sb, 0x6e667364, nfsd_files); } static int nfsd_get_sb(struct file_system_type *fs_type, int flags, const char *dev_name, void *data, struct vfsmount *mnt) { return get_sb_single(fs_type, flags, data, nfsd_fill_super, mnt); } static struct file_system_type nfsd_fs_type = { .owner = THIS_MODULE, .name = "nfsd", .get_sb = nfsd_get_sb, .kill_sb = kill_litter_super, }; #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_operations); if (!entry) return -ENOMEM; return 0; } #else /* CONFIG_PROC_FS */ static int create_proc_exports_entry(void) { return 0; } #endif static int __init init_nfsd(void) { int retval; printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n"); retval = nfs4_state_init(); /* nfs4 locking state */ if (retval) return retval; nfsd_stat_init(); /* Statistics */ retval = nfsd_reply_cache_init(); if (retval) goto out_free_stat; retval = nfsd_export_init(); if (retval) goto out_free_cache; nfsd_lockd_init(); /* lockd->nfsd callbacks */ retval = nfsd_idmap_init(); if (retval) goto out_free_lockd; retval = create_proc_exports_entry(); if (retval) goto out_free_idmap; 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_idmap: nfsd_idmap_shutdown(); out_free_lockd: nfsd_lockd_shutdown(); nfsd_export_shutdown(); out_free_cache: nfsd_reply_cache_shutdown(); out_free_stat: nfsd_stat_shutdown(); nfsd4_free_slabs(); return retval; } static void __exit exit_nfsd(void) { nfsd_export_shutdown(); nfsd_reply_cache_shutdown(); remove_proc_entry("fs/nfs/exports", NULL); remove_proc_entry("fs/nfs", NULL); nfsd_stat_shutdown(); nfsd_lockd_shutdown(); nfsd_idmap_shutdown(); nfsd4_free_slabs(); unregister_filesystem(&nfsd_fs_type); } MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>"); MODULE_LICENSE("GPL"); module_init(init_nfsd) module_exit(exit_nfsd)