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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 | /* * linux/fs/nfsd/nfsctl.c * * Syscall interface to knfsd. * * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de> */ #include <linux/config.h> #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/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/nfs.h> #include <linux/sunrpc/svc.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 8 nodes in it. */ enum { NFSD_Root = 1, NFSD_Svc, NFSD_Add, NFSD_Del, NFSD_Export, NFSD_Unexport, NFSD_Getfd, NFSD_Getfs, NFSD_List, }; /* * write() for these nodes. */ static ssize_t write_svc(struct file *file, const char *buf, size_t size); static ssize_t write_add(struct file *file, const char *buf, size_t size); static ssize_t write_del(struct file *file, const char *buf, size_t size); static ssize_t write_export(struct file *file, const char *buf, size_t size); static ssize_t write_unexport(struct file *file, const char *buf, size_t size); static ssize_t write_getfd(struct file *file, const char *buf, size_t size); static ssize_t write_getfs(struct file *file, const char *buf, size_t size); static ssize_t (*write_op[])(struct file *, const 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, }; static ssize_t fs_write(struct file *file, const char *buf, size_t size, loff_t *pos) { ino_t ino = file->f_dentry->d_inode->i_ino; if (ino >= sizeof(write_op)/sizeof(write_op[0]) || !write_op[ino]) return -EINVAL; return write_op[ino](file, buf, size); } /* * read(), open() and release() for getfs and getfd (read/write ones). * IO on these is a simple transaction - you open() the file, write() to it * and that generates a (stored) response. After that read() will simply * access that response. */ static ssize_t TA_read(struct file *file, char *buf, size_t size, loff_t *pos) { if (!file->private_data) return 0; if (*pos >= file->f_dentry->d_inode->i_size) return 0; if (*pos + size > file->f_dentry->d_inode->i_size) size = file->f_dentry->d_inode->i_size - *pos; if (copy_to_user(buf, file->private_data + *pos, size)) return -EFAULT; *pos += size; return size; } static int TA_open(struct inode *inode, struct file *file) { file->private_data = NULL; return 0; } static int TA_release(struct inode *inode, struct file *file) { void *p = file->private_data; file->private_data = NULL; kfree(p); return 0; } static struct file_operations writer_ops = { .write = fs_write, }; static struct file_operations reader_ops = { .write = fs_write, .read = TA_read, .open = TA_open, .release = TA_release, }; extern struct seq_operations nfs_exports_op; static int exports_open(struct inode *inode, struct file *file) { int res; char *namebuf = kmalloc(PAGE_SIZE, GFP_KERNEL); if (namebuf == NULL) return -ENOMEM; res = seq_open(file, &nfs_exports_op); if (res) kfree(namebuf); else ((struct seq_file *)file->private_data)->private = namebuf; return res; } static int exports_release(struct inode *inode, struct file *file) { struct seq_file *m = (struct seq_file *)file->private_data; kfree(m->private); m->private = NULL; return seq_release(inode, file); } static struct file_operations exports_operations = { .open = exports_open, .read = seq_read, .llseek = seq_lseek, .release = exports_release, }; /* * Description of fs contents. */ static struct { char *name; struct file_operations *ops; int mode; } files[] = { [NFSD_Svc] = {"svc", &writer_ops, S_IWUSR}, [NFSD_Add] = {"add", &writer_ops, S_IWUSR}, [NFSD_Del] = {"del", &writer_ops, S_IWUSR}, [NFSD_Export] = {"export", &writer_ops, S_IWUSR}, [NFSD_Unexport] = {"unexport", &writer_ops, S_IWUSR}, [NFSD_Getfd] = {"getfd", &reader_ops, S_IWUSR|S_IRUSR}, [NFSD_Getfs] = {"getfs", &reader_ops, S_IWUSR|S_IRUSR}, [NFSD_List] = {"exports", &exports_operations, S_IRUGO}, }; /*----------------------------------------------------------------------------*/ /* * payload - write methods */ static ssize_t write_svc(struct file *file, const char *buf, size_t size) { struct nfsctl_svc data; if (size < sizeof(data)) return -EINVAL; if (copy_from_user(&data, buf, size)) return -EFAULT; return nfsd_svc(data.svc_port, data.svc_nthreads); } static ssize_t write_add(struct file *file, const char *buf, size_t size) { struct nfsctl_client data; if (size < sizeof(data)) return -EINVAL; if (copy_from_user(&data, buf, size)) return -EFAULT; return exp_addclient(&data); } static ssize_t write_del(struct file *file, const char *buf, size_t size) { struct nfsctl_client data; if (size < sizeof(data)) return -EINVAL; if (copy_from_user(&data, buf, size)) return -EFAULT; return exp_delclient(&data); } static ssize_t write_export(struct file *file, const char *buf, size_t size) { struct nfsctl_export data; if (size < sizeof(data)) return -EINVAL; if (copy_from_user(&data, buf, size)) return -EFAULT; return exp_export(&data); } static ssize_t write_unexport(struct file *file, const char *buf, size_t size) { struct nfsctl_export data; if (size < sizeof(data)) return -EINVAL; if (copy_from_user(&data, buf, size)) return -EFAULT; return exp_unexport(&data); } static ssize_t write_getfs(struct file *file, const 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 (file->private_data) return -EINVAL; if (size < sizeof(data)) return -EINVAL; if (copy_from_user(&data, buf, size)) return -EFAULT; if (data.gd_addr.sa_family != AF_INET) return -EPROTONOSUPPORT; sin = (struct sockaddr_in *)&data.gd_addr; if (data.gd_maxlen > NFS3_FHSIZE) data.gd_maxlen = NFS3_FHSIZE; res = kmalloc(sizeof(struct knfsd_fh), GFP_KERNEL); if (!res) return -ENOMEM; memset(res, 0, sizeof(struct knfsd_fh)); 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(); down(&file->f_dentry->d_inode->i_sem); if (file->private_data) err = -EINVAL; if (err) kfree(res); else { file->f_dentry->d_inode->i_size = res->fh_size + (int)&((struct knfsd_fh*)0)->fh_base; file->private_data = res; err = sizeof(data); } up(&file->f_dentry->d_inode->i_sem); return err; } static ssize_t write_getfd(struct file *file, const 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 (file->private_data) return -EINVAL; if (size < sizeof(data)) return -EINVAL; if (copy_from_user(&data, buf, size)) return -EFAULT; if (data.gd_addr.sa_family != AF_INET) return -EPROTONOSUPPORT; if (data.gd_version < 2 || data.gd_version > NFSSVC_MAXVERS) return -EINVAL; res = kmalloc(NFS_FHSIZE, GFP_KERNEL); if (!res) return -ENOMEM; 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(); down(&file->f_dentry->d_inode->i_sem); if (file->private_data) err = -EINVAL; if (!err && fh.fh_size > NFS_FHSIZE) err = -EINVAL; if (err) kfree(res); else { memset(res,0, NFS_FHSIZE); memcpy(res, &fh.fh_base, fh.fh_size); file->f_dentry->d_inode->i_size = NFS_FHSIZE; file->private_data = res; err = sizeof(data); } up(&file->f_dentry->d_inode->i_sem); return err; } /*----------------------------------------------------------------------------*/ /* * populating the filesystem. */ static struct super_operations s_ops = { .statfs = simple_statfs, }; static int nfsd_fill_super(struct super_block * sb, void * data, int silent) { struct inode *inode; struct dentry *root; struct dentry *dentry; int i; sb->s_blocksize = PAGE_CACHE_SIZE; sb->s_blocksize_bits = PAGE_CACHE_SHIFT; sb->s_magic = 0x6e667364; sb->s_op = &s_ops; inode = new_inode(sb); if (!inode) return -ENOMEM; inode->i_mode = S_IFDIR | 0755; inode->i_uid = inode->i_gid = 0; inode->i_blksize = PAGE_CACHE_SIZE; inode->i_blocks = 0; inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; inode->i_op = &simple_dir_inode_operations; inode->i_fop = &simple_dir_operations; root = d_alloc_root(inode); if (!root) { iput(inode); return -ENOMEM; } for (i = NFSD_Svc; i <= NFSD_List; i++) { struct qstr name; name.name = files[i].name; name.len = strlen(name.name); name.hash = full_name_hash(name.name, name.len); dentry = d_alloc(root, &name); if (!dentry) goto out; inode = new_inode(sb); if (!inode) goto out; inode->i_mode = S_IFREG | files[i].mode; inode->i_uid = inode->i_gid = 0; inode->i_blksize = PAGE_CACHE_SIZE; inode->i_blocks = 0; inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; inode->i_fop = files[i].ops; inode->i_ino = i; d_add(dentry, inode); } sb->s_root = root; return 0; out: d_genocide(root); dput(root); return -ENOMEM; } static struct super_block *nfsd_get_sb(struct file_system_type *fs_type, int flags, char *dev_name, void *data) { return get_sb_single(fs_type, flags, data, nfsd_fill_super); } 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) { 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 */ if (proc_mkdir("fs/nfs", 0)) { struct proc_dir_entry *entry; entry = create_proc_entry("fs/nfs/exports", 0, NULL); if (entry) entry->proc_fops = &exports_operations; } register_filesystem(&nfsd_fs_type); return 0; } 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(); unregister_filesystem(&nfsd_fs_type); } MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>"); MODULE_LICENSE("GPL"); module_init(init_nfsd) module_exit(exit_nfsd) |