/* * linux/fs/nfsd/nfsctl.c * * Syscall interface to knfsd. * * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de> */ #include <linux/module.h> #include <linux/linkage.h> #include <linux/time.h> #include <linux/errno.h> #include <linux/fs.h> #include <linux/fcntl.h> #include <linux/net.h> #include <linux/in.h> #include <linux/syscalls.h> #include <linux/unistd.h> #include <linux/slab.h> #include <linux/proc_fs.h> #include <linux/seq_file.h> #include <linux/pagemap.h> #include <linux/init.h> #include <linux/string.h> #include <linux/smp_lock.h> #include <linux/ctype.h> #include <linux/nfs.h> #include <linux/nfsd_idmap.h> #include <linux/lockd/bind.h> #include <linux/sunrpc/svc.h> #include <linux/sunrpc/svcsock.h> #include <linux/nfsd/nfsd.h> #include <linux/nfsd/cache.h> #include <linux/nfsd/xdr.h> #include <linux/nfsd/syscall.h> #include <linux/nfsd/interface.h> #include <asm/uaccess.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_Fh, NFSD_Threads, NFSD_Pool_Threads, 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_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_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_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_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_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_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, }; extern struct seq_operations nfs_exports_op; 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, }; /*----------------------------------------------------------------------------*/ /* * payload - write methods * If the method has a response, the response should be put in buf, * and the length returned. Otherwise return 0 or and -error. */ static ssize_t write_svc(struct file *file, char *buf, size_t size) { struct nfsctl_svc *data; if (size < sizeof(*data)) return -EINVAL; data = (struct nfsctl_svc*) buf; return nfsd_svc(data->svc_port, data->svc_nthreads); } 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); } 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); } 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); } 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); } 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; 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(); if (!(clp = auth_unix_lookup(sin->sin_addr))) 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 + (int)&((struct knfsd_fh*)0)->fh_base; out: return err; } 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; 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(); if (!(clp = auth_unix_lookup(sin->sin_addr))) 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; } static ssize_t write_filehandle(struct file *file, char *buf, size_t size) { /* request is: * domain path maxsize * response is * filehandle * * qword quoting is used, so filehandle will be \x.... */ char *dname, *path; int maxsize; char *mesg = buf; int len; struct auth_domain *dom; struct knfsd_fh fh; 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; } extern int nfsd_nrthreads(void); static ssize_t write_threads(struct file *file, char *buf, size_t size) { /* if size > 0, look for a number of threads and call nfsd_svc * then write out number of threads as reply */ 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(2049, newthreads); if (rv) return rv; } sprintf(buf, "%d\n", nfsd_nrthreads()); return strlen(buf); } extern int nfsd_nrpools(void); extern int nfsd_get_nrthreads(int n, int *); extern int nfsd_set_nrthreads(int n, int *); 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 = nfsd_nrpools(); int *nthreads; 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. */ strcpy(buf, "0\n"); return strlen(buf); } nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL); if (nthreads == NULL) return -ENOMEM; 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; } return (mesg-buf); out_free: kfree(nthreads); return rv; } static ssize_t write_versions(struct file *file, char *buf, size_t size) { /* * Format: * [-/+]vers [-/+]vers ... */ char *mesg = buf; char *vers, sign; int len, num; 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), NULL, 0); else num = simple_strtol(vers, NULL, 0); switch(num) { case 2: case 3: case 4: nfsd_vers(num, sign == '-' ? NFSD_CLEAR : NFSD_SET); break; default: return -EINVAL; } vers += len + 1; tlen += len; } 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 = ""; for (num=2 ; num <= 4 ; num++) if (nfsd_vers(num, NFSD_AVAIL)) { len += sprintf(buf+len, "%s%c%d", sep, nfsd_vers(num, NFSD_TEST)?'+':'-', num); sep = " "; } len += sprintf(buf+len, "\n"); return len; } 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; } int nfsd_max_blksize; 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); lock_kernel(); if (nfsd_serv && nfsd_serv->sv_nrthreads) { unlock_kernel(); return -EBUSY; } nfsd_max_blksize = bsize; unlock_kernel(); } return sprintf(buf, "%d\n", nfsd_max_blksize); } #ifdef CONFIG_NFSD_V4 extern time_t nfs4_leasetime(void); static ssize_t write_leasetime(struct file *file, char *buf, size_t size) { /* if size > 10 seconds, call * nfs4_reset_lease() then write out the new lease (seconds) as reply */ char *mesg = buf; int rv; if (size > 0) { int lease; rv = get_int(&mesg, &lease); if (rv) return rv; if (lease < 10 || lease > 3600) return -EINVAL; nfs4_reset_lease(lease); } sprintf(buf, "%ld\n", nfs4_lease_time()); return strlen(buf); } static ssize_t write_recoverydir(struct file *file, char *buf, size_t size) { char *mesg = buf; char *recdir; int len, status; 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); return strlen(buf); } #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_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_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_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, }; static int __init init_nfsd(void) { int retval; printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n"); nfsd_stat_init(); /* Statistics */ nfsd_cache_init(); /* RPC reply cache */ nfsd_export_init(); /* Exports table */ nfsd_lockd_init(); /* lockd->nfsd callbacks */ nfs4_state_init(); /* NFSv4 locking state */ nfsd_idmap_init(); /* Name to ID mapping */ if (proc_mkdir("fs/nfs", NULL)) { struct proc_dir_entry *entry; entry = create_proc_entry("fs/nfs/exports", 0, NULL); if (entry) entry->proc_fops = &exports_operations; } retval = register_filesystem(&nfsd_fs_type); if (retval) { nfsd_export_shutdown(); nfsd_cache_shutdown(); remove_proc_entry("fs/nfs/exports", NULL); remove_proc_entry("fs/nfs", NULL); nfsd_stat_shutdown(); nfsd_lockd_shutdown(); } return retval; } static void __exit exit_nfsd(void) { nfsd_export_shutdown(); nfsd_cache_shutdown(); remove_proc_entry("fs/nfs/exports", NULL); remove_proc_entry("fs/nfs", NULL); nfsd_stat_shutdown(); nfsd_lockd_shutdown(); nfsd_idmap_shutdown(); unregister_filesystem(&nfsd_fs_type); } MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>"); MODULE_LICENSE("GPL"); module_init(init_nfsd) module_exit(exit_nfsd)