| /* |
| * 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/namei.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/inet.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/lockd/lockd.h> |
| |
| #include <asm/uaccess.h> |
| #include <net/ipv6.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_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_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_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_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, |
| }; |
| |
| extern int nfsd_pool_stats_open(struct inode *inode, struct file *file); |
| |
| static struct file_operations pool_stats_operations = { |
| .open = nfsd_pool_stats_open, |
| .read = seq_read, |
| .llseek = seq_lseek, |
| .release = seq_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; |
| if (size < sizeof(*data)) |
| return -EINVAL; |
| data = (struct nfsctl_svc*) buf; |
| return nfsd_svc(data->svc_port, data->svc_nthreads); |
| } |
| |
| /** |
| * 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 IPv4 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 |
| * |
| * Note: Only AF_INET client addresses are passed in |
| */ |
| static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size) |
| { |
| struct sockaddr_in sin = { |
| .sin_family = AF_INET, |
| }; |
| int b1, b2, b3, b4; |
| char c; |
| 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; |
| |
| /* get ipv4 address */ |
| if (sscanf(fo_path, "%u.%u.%u.%u%c", &b1, &b2, &b3, &b4, &c) != 4) |
| return -EINVAL; |
| if (b1 > 255 || b2 > 255 || b3 > 255 || b4 > 255) |
| return -EINVAL; |
| sin.sin_addr.s_addr = htonl((b1 << 24) | (b2 << 16) | (b3 << 8) | b4); |
| |
| return nlmsvc_unlock_all_by_ip((struct sockaddr *)&sin); |
| } |
| |
| /** |
| * 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) |
| return rv; |
| } |
| |
| return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n", |
| nfsd_nrthreads()); |
| } |
| |
| /** |
| * 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; |
| } |
| |
| mutex_unlock(&nfsd_mutex); |
| return (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 = lockd_up(); |
| if (err != 0) |
| goto out; |
| |
| err = svc_addsock(nfsd_serv, fd, buf, SIMPLE_TRANSACTION_LIMIT); |
| if (err < 0) |
| lockd_down(); |
| |
| out: |
| /* 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); |
| if (len >= 0) |
| lockd_down(); |
| |
| 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]; |
| int port, err; |
| |
| if (sscanf(buf, "%15s %4u", transport, &port) != 2) |
| return -EINVAL; |
| |
| if (port < 1 || port > USHORT_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) { |
| /* Give a reasonable perror msg for bad transport string */ |
| if (err == -ENOENT) |
| err = -EPROTONOSUPPORT; |
| return err; |
| } |
| return 0; |
| } |
| |
| /* |
| * 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 > USHORT_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 && nfsd_serv->sv_nrthreads) { |
| 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 |
| 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, lease; |
| |
| if (size > 0) { |
| if (nfsd_serv) |
| return -EBUSY; |
| rv = get_int(&mesg, &lease); |
| if (rv) |
| return rv; |
| if (lease < 10 || lease > 3600) |
| return -EINVAL; |
| nfs4_reset_lease(lease); |
| } |
| |
| return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%ld\n", |
| nfs4_lease_time()); |
| } |
| |
| /** |
| * 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) |
| { |
| ssize_t rv; |
| |
| mutex_lock(&nfsd_mutex); |
| rv = __write_leasetime(file, buf, size); |
| mutex_unlock(&nfsd_mutex); |
| return rv; |
| } |
| |
| 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); |
| } |
| |
| 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_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_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) |