Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | #define MSNFS /* HACK HACK */ |
| 2 | /* |
| 3 | * linux/fs/nfsd/export.c |
| 4 | * |
| 5 | * NFS exporting and validation. |
| 6 | * |
| 7 | * We maintain a list of clients, each of which has a list of |
| 8 | * exports. To export an fs to a given client, you first have |
| 9 | * to create the client entry with NFSCTL_ADDCLIENT, which |
| 10 | * creates a client control block and adds it to the hash |
| 11 | * table. Then, you call NFSCTL_EXPORT for each fs. |
| 12 | * |
| 13 | * |
| 14 | * Copyright (C) 1995, 1996 Olaf Kirch, <okir@monad.swb.de> |
| 15 | */ |
| 16 | |
| 17 | #include <linux/unistd.h> |
| 18 | #include <linux/slab.h> |
| 19 | #include <linux/sched.h> |
| 20 | #include <linux/stat.h> |
| 21 | #include <linux/in.h> |
| 22 | #include <linux/seq_file.h> |
| 23 | #include <linux/syscalls.h> |
| 24 | #include <linux/rwsem.h> |
| 25 | #include <linux/dcache.h> |
| 26 | #include <linux/namei.h> |
| 27 | #include <linux/mount.h> |
| 28 | #include <linux/hash.h> |
Bruce Allan | f35279d | 2005-09-06 15:17:08 -0700 | [diff] [blame^] | 29 | #include <linux/module.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | |
| 31 | #include <linux/sunrpc/svc.h> |
| 32 | #include <linux/nfsd/nfsd.h> |
| 33 | #include <linux/nfsd/nfsfh.h> |
| 34 | #include <linux/nfsd/syscall.h> |
| 35 | #include <linux/lockd/bind.h> |
| 36 | |
| 37 | #define NFSDDBG_FACILITY NFSDDBG_EXPORT |
| 38 | #define NFSD_PARANOIA 1 |
| 39 | |
| 40 | typedef struct auth_domain svc_client; |
| 41 | typedef struct svc_export svc_export; |
| 42 | |
| 43 | static void exp_do_unexport(svc_export *unexp); |
| 44 | static int exp_verify_string(char *cp, int max); |
| 45 | |
| 46 | /* |
| 47 | * We have two caches. |
| 48 | * One maps client+vfsmnt+dentry to export options - the export map |
| 49 | * The other maps client+filehandle-fragment to export options. - the expkey map |
| 50 | * |
| 51 | * The export options are actually stored in the first map, and the |
| 52 | * second map contains a reference to the entry in the first map. |
| 53 | */ |
| 54 | |
| 55 | #define EXPKEY_HASHBITS 8 |
| 56 | #define EXPKEY_HASHMAX (1 << EXPKEY_HASHBITS) |
| 57 | #define EXPKEY_HASHMASK (EXPKEY_HASHMAX -1) |
| 58 | static struct cache_head *expkey_table[EXPKEY_HASHMAX]; |
| 59 | |
| 60 | static inline int svc_expkey_hash(struct svc_expkey *item) |
| 61 | { |
| 62 | int hash = item->ek_fsidtype; |
| 63 | char * cp = (char*)item->ek_fsid; |
| 64 | int len = key_len(item->ek_fsidtype); |
| 65 | |
| 66 | hash ^= hash_mem(cp, len, EXPKEY_HASHBITS); |
| 67 | hash ^= hash_ptr(item->ek_client, EXPKEY_HASHBITS); |
| 68 | return hash & EXPKEY_HASHMASK; |
| 69 | } |
| 70 | |
| 71 | void expkey_put(struct cache_head *item, struct cache_detail *cd) |
| 72 | { |
| 73 | if (cache_put(item, cd)) { |
| 74 | struct svc_expkey *key = container_of(item, struct svc_expkey, h); |
| 75 | if (test_bit(CACHE_VALID, &item->flags) && |
| 76 | !test_bit(CACHE_NEGATIVE, &item->flags)) |
| 77 | exp_put(key->ek_export); |
| 78 | auth_domain_put(key->ek_client); |
| 79 | kfree(key); |
| 80 | } |
| 81 | } |
| 82 | |
| 83 | static void expkey_request(struct cache_detail *cd, |
| 84 | struct cache_head *h, |
| 85 | char **bpp, int *blen) |
| 86 | { |
| 87 | /* client fsidtype \xfsid */ |
| 88 | struct svc_expkey *ek = container_of(h, struct svc_expkey, h); |
| 89 | char type[5]; |
| 90 | |
| 91 | qword_add(bpp, blen, ek->ek_client->name); |
| 92 | snprintf(type, 5, "%d", ek->ek_fsidtype); |
| 93 | qword_add(bpp, blen, type); |
| 94 | qword_addhex(bpp, blen, (char*)ek->ek_fsid, key_len(ek->ek_fsidtype)); |
| 95 | (*bpp)[-1] = '\n'; |
| 96 | } |
| 97 | |
| 98 | static struct svc_expkey *svc_expkey_lookup(struct svc_expkey *, int); |
| 99 | static int expkey_parse(struct cache_detail *cd, char *mesg, int mlen) |
| 100 | { |
| 101 | /* client fsidtype fsid [path] */ |
| 102 | char *buf; |
| 103 | int len; |
| 104 | struct auth_domain *dom = NULL; |
| 105 | int err; |
| 106 | int fsidtype; |
| 107 | char *ep; |
| 108 | struct svc_expkey key; |
| 109 | |
| 110 | if (mesg[mlen-1] != '\n') |
| 111 | return -EINVAL; |
| 112 | mesg[mlen-1] = 0; |
| 113 | |
| 114 | buf = kmalloc(PAGE_SIZE, GFP_KERNEL); |
| 115 | err = -ENOMEM; |
| 116 | if (!buf) goto out; |
| 117 | |
| 118 | err = -EINVAL; |
| 119 | if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0) |
| 120 | goto out; |
| 121 | |
| 122 | err = -ENOENT; |
| 123 | dom = auth_domain_find(buf); |
| 124 | if (!dom) |
| 125 | goto out; |
| 126 | dprintk("found domain %s\n", buf); |
| 127 | |
| 128 | err = -EINVAL; |
| 129 | if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0) |
| 130 | goto out; |
| 131 | fsidtype = simple_strtoul(buf, &ep, 10); |
| 132 | if (*ep) |
| 133 | goto out; |
| 134 | dprintk("found fsidtype %d\n", fsidtype); |
| 135 | if (fsidtype > 2) |
| 136 | goto out; |
| 137 | if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0) |
| 138 | goto out; |
| 139 | dprintk("found fsid length %d\n", len); |
| 140 | if (len != key_len(fsidtype)) |
| 141 | goto out; |
| 142 | |
| 143 | /* OK, we seem to have a valid key */ |
| 144 | key.h.flags = 0; |
| 145 | key.h.expiry_time = get_expiry(&mesg); |
| 146 | if (key.h.expiry_time == 0) |
| 147 | goto out; |
| 148 | |
| 149 | key.ek_client = dom; |
| 150 | key.ek_fsidtype = fsidtype; |
| 151 | memcpy(key.ek_fsid, buf, len); |
| 152 | |
| 153 | /* now we want a pathname, or empty meaning NEGATIVE */ |
| 154 | if ((len=qword_get(&mesg, buf, PAGE_SIZE)) < 0) |
| 155 | goto out; |
| 156 | dprintk("Path seems to be <%s>\n", buf); |
| 157 | err = 0; |
| 158 | if (len == 0) { |
| 159 | struct svc_expkey *ek; |
| 160 | set_bit(CACHE_NEGATIVE, &key.h.flags); |
| 161 | ek = svc_expkey_lookup(&key, 1); |
| 162 | if (ek) |
| 163 | expkey_put(&ek->h, &svc_expkey_cache); |
| 164 | } else { |
| 165 | struct nameidata nd; |
| 166 | struct svc_expkey *ek; |
| 167 | struct svc_export *exp; |
| 168 | err = path_lookup(buf, 0, &nd); |
| 169 | if (err) |
| 170 | goto out; |
| 171 | |
| 172 | dprintk("Found the path %s\n", buf); |
| 173 | exp = exp_get_by_name(dom, nd.mnt, nd.dentry, NULL); |
| 174 | |
| 175 | err = -ENOENT; |
| 176 | if (!exp) |
| 177 | goto out_nd; |
| 178 | key.ek_export = exp; |
| 179 | dprintk("And found export\n"); |
| 180 | |
| 181 | ek = svc_expkey_lookup(&key, 1); |
| 182 | if (ek) |
| 183 | expkey_put(&ek->h, &svc_expkey_cache); |
| 184 | exp_put(exp); |
| 185 | err = 0; |
| 186 | out_nd: |
| 187 | path_release(&nd); |
| 188 | } |
| 189 | cache_flush(); |
| 190 | out: |
| 191 | if (dom) |
| 192 | auth_domain_put(dom); |
| 193 | if (buf) |
| 194 | kfree(buf); |
| 195 | return err; |
| 196 | } |
| 197 | |
| 198 | static int expkey_show(struct seq_file *m, |
| 199 | struct cache_detail *cd, |
| 200 | struct cache_head *h) |
| 201 | { |
| 202 | struct svc_expkey *ek ; |
| 203 | |
| 204 | if (h ==NULL) { |
| 205 | seq_puts(m, "#domain fsidtype fsid [path]\n"); |
| 206 | return 0; |
| 207 | } |
| 208 | ek = container_of(h, struct svc_expkey, h); |
| 209 | seq_printf(m, "%s %d 0x%08x", ek->ek_client->name, |
| 210 | ek->ek_fsidtype, ek->ek_fsid[0]); |
| 211 | if (ek->ek_fsidtype != 1) |
| 212 | seq_printf(m, "%08x", ek->ek_fsid[1]); |
| 213 | if (ek->ek_fsidtype == 2) |
| 214 | seq_printf(m, "%08x", ek->ek_fsid[2]); |
| 215 | if (test_bit(CACHE_VALID, &h->flags) && |
| 216 | !test_bit(CACHE_NEGATIVE, &h->flags)) { |
| 217 | seq_printf(m, " "); |
| 218 | seq_path(m, ek->ek_export->ex_mnt, ek->ek_export->ex_dentry, "\\ \t\n"); |
| 219 | } |
| 220 | seq_printf(m, "\n"); |
| 221 | return 0; |
| 222 | } |
| 223 | |
| 224 | struct cache_detail svc_expkey_cache = { |
Bruce Allan | f35279d | 2005-09-06 15:17:08 -0700 | [diff] [blame^] | 225 | .owner = THIS_MODULE, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 226 | .hash_size = EXPKEY_HASHMAX, |
| 227 | .hash_table = expkey_table, |
| 228 | .name = "nfsd.fh", |
| 229 | .cache_put = expkey_put, |
| 230 | .cache_request = expkey_request, |
| 231 | .cache_parse = expkey_parse, |
| 232 | .cache_show = expkey_show, |
| 233 | }; |
| 234 | |
| 235 | static inline int svc_expkey_match (struct svc_expkey *a, struct svc_expkey *b) |
| 236 | { |
| 237 | if (a->ek_fsidtype != b->ek_fsidtype || |
| 238 | a->ek_client != b->ek_client || |
| 239 | memcmp(a->ek_fsid, b->ek_fsid, key_len(a->ek_fsidtype)) != 0) |
| 240 | return 0; |
| 241 | return 1; |
| 242 | } |
| 243 | |
| 244 | static inline void svc_expkey_init(struct svc_expkey *new, struct svc_expkey *item) |
| 245 | { |
| 246 | cache_get(&item->ek_client->h); |
| 247 | new->ek_client = item->ek_client; |
| 248 | new->ek_fsidtype = item->ek_fsidtype; |
| 249 | new->ek_fsid[0] = item->ek_fsid[0]; |
| 250 | new->ek_fsid[1] = item->ek_fsid[1]; |
| 251 | new->ek_fsid[2] = item->ek_fsid[2]; |
| 252 | } |
| 253 | |
| 254 | static inline void svc_expkey_update(struct svc_expkey *new, struct svc_expkey *item) |
| 255 | { |
| 256 | cache_get(&item->ek_export->h); |
| 257 | new->ek_export = item->ek_export; |
| 258 | } |
| 259 | |
| 260 | static DefineSimpleCacheLookup(svc_expkey,0) /* no inplace updates */ |
| 261 | |
| 262 | #define EXPORT_HASHBITS 8 |
| 263 | #define EXPORT_HASHMAX (1<< EXPORT_HASHBITS) |
| 264 | #define EXPORT_HASHMASK (EXPORT_HASHMAX -1) |
| 265 | |
| 266 | static struct cache_head *export_table[EXPORT_HASHMAX]; |
| 267 | |
| 268 | static inline int svc_export_hash(struct svc_export *item) |
| 269 | { |
| 270 | int rv; |
| 271 | |
| 272 | rv = hash_ptr(item->ex_client, EXPORT_HASHBITS); |
| 273 | rv ^= hash_ptr(item->ex_dentry, EXPORT_HASHBITS); |
| 274 | rv ^= hash_ptr(item->ex_mnt, EXPORT_HASHBITS); |
| 275 | return rv; |
| 276 | } |
| 277 | |
| 278 | void svc_export_put(struct cache_head *item, struct cache_detail *cd) |
| 279 | { |
| 280 | if (cache_put(item, cd)) { |
| 281 | struct svc_export *exp = container_of(item, struct svc_export, h); |
| 282 | dput(exp->ex_dentry); |
| 283 | mntput(exp->ex_mnt); |
| 284 | auth_domain_put(exp->ex_client); |
| 285 | kfree(exp); |
| 286 | } |
| 287 | } |
| 288 | |
| 289 | static void svc_export_request(struct cache_detail *cd, |
| 290 | struct cache_head *h, |
| 291 | char **bpp, int *blen) |
| 292 | { |
| 293 | /* client path */ |
| 294 | struct svc_export *exp = container_of(h, struct svc_export, h); |
| 295 | char *pth; |
| 296 | |
| 297 | qword_add(bpp, blen, exp->ex_client->name); |
| 298 | pth = d_path(exp->ex_dentry, exp->ex_mnt, *bpp, *blen); |
| 299 | if (IS_ERR(pth)) { |
| 300 | /* is this correct? */ |
| 301 | (*bpp)[0] = '\n'; |
| 302 | return; |
| 303 | } |
| 304 | qword_add(bpp, blen, pth); |
| 305 | (*bpp)[-1] = '\n'; |
| 306 | } |
| 307 | |
| 308 | static struct svc_export *svc_export_lookup(struct svc_export *, int); |
| 309 | |
| 310 | static int check_export(struct inode *inode, int flags) |
| 311 | { |
| 312 | |
| 313 | /* We currently export only dirs and regular files. |
| 314 | * This is what umountd does. |
| 315 | */ |
| 316 | if (!S_ISDIR(inode->i_mode) && |
| 317 | !S_ISREG(inode->i_mode)) |
| 318 | return -ENOTDIR; |
| 319 | |
| 320 | /* There are two requirements on a filesystem to be exportable. |
| 321 | * 1: We must be able to identify the filesystem from a number. |
| 322 | * either a device number (so FS_REQUIRES_DEV needed) |
| 323 | * or an FSID number (so NFSEXP_FSID needed). |
| 324 | * 2: We must be able to find an inode from a filehandle. |
| 325 | * This means that s_export_op must be set. |
| 326 | */ |
| 327 | if (!(inode->i_sb->s_type->fs_flags & FS_REQUIRES_DEV) && |
| 328 | !(flags & NFSEXP_FSID)) { |
| 329 | dprintk("exp_export: export of non-dev fs without fsid"); |
| 330 | return -EINVAL; |
| 331 | } |
| 332 | if (!inode->i_sb->s_export_op) { |
| 333 | dprintk("exp_export: export of invalid fs type.\n"); |
| 334 | return -EINVAL; |
| 335 | } |
| 336 | |
| 337 | /* Ok, we can export it */; |
| 338 | if (!inode->i_sb->s_export_op->find_exported_dentry) |
| 339 | inode->i_sb->s_export_op->find_exported_dentry = |
| 340 | find_exported_dentry; |
| 341 | return 0; |
| 342 | |
| 343 | } |
| 344 | |
| 345 | static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen) |
| 346 | { |
| 347 | /* client path expiry [flags anonuid anongid fsid] */ |
| 348 | char *buf; |
| 349 | int len; |
| 350 | int err; |
| 351 | struct auth_domain *dom = NULL; |
| 352 | struct nameidata nd; |
| 353 | struct svc_export exp, *expp; |
| 354 | int an_int; |
| 355 | |
| 356 | nd.dentry = NULL; |
| 357 | |
| 358 | if (mesg[mlen-1] != '\n') |
| 359 | return -EINVAL; |
| 360 | mesg[mlen-1] = 0; |
| 361 | |
| 362 | buf = kmalloc(PAGE_SIZE, GFP_KERNEL); |
| 363 | err = -ENOMEM; |
| 364 | if (!buf) goto out; |
| 365 | |
| 366 | /* client */ |
| 367 | len = qword_get(&mesg, buf, PAGE_SIZE); |
| 368 | err = -EINVAL; |
| 369 | if (len <= 0) goto out; |
| 370 | |
| 371 | err = -ENOENT; |
| 372 | dom = auth_domain_find(buf); |
| 373 | if (!dom) |
| 374 | goto out; |
| 375 | |
| 376 | /* path */ |
| 377 | err = -EINVAL; |
| 378 | if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0) |
| 379 | goto out; |
| 380 | err = path_lookup(buf, 0, &nd); |
| 381 | if (err) goto out; |
| 382 | |
| 383 | exp.h.flags = 0; |
| 384 | exp.ex_client = dom; |
| 385 | exp.ex_mnt = nd.mnt; |
| 386 | exp.ex_dentry = nd.dentry; |
| 387 | |
| 388 | /* expiry */ |
| 389 | err = -EINVAL; |
| 390 | exp.h.expiry_time = get_expiry(&mesg); |
| 391 | if (exp.h.expiry_time == 0) |
| 392 | goto out; |
| 393 | |
| 394 | /* flags */ |
| 395 | err = get_int(&mesg, &an_int); |
| 396 | if (err == -ENOENT) |
| 397 | set_bit(CACHE_NEGATIVE, &exp.h.flags); |
| 398 | else { |
| 399 | if (err || an_int < 0) goto out; |
| 400 | exp.ex_flags= an_int; |
| 401 | |
| 402 | /* anon uid */ |
| 403 | err = get_int(&mesg, &an_int); |
| 404 | if (err) goto out; |
| 405 | exp.ex_anon_uid= an_int; |
| 406 | |
| 407 | /* anon gid */ |
| 408 | err = get_int(&mesg, &an_int); |
| 409 | if (err) goto out; |
| 410 | exp.ex_anon_gid= an_int; |
| 411 | |
| 412 | /* fsid */ |
| 413 | err = get_int(&mesg, &an_int); |
| 414 | if (err) goto out; |
| 415 | exp.ex_fsid = an_int; |
| 416 | |
| 417 | err = check_export(nd.dentry->d_inode, exp.ex_flags); |
| 418 | if (err) goto out; |
| 419 | } |
| 420 | |
| 421 | expp = svc_export_lookup(&exp, 1); |
| 422 | if (expp) |
| 423 | exp_put(expp); |
| 424 | err = 0; |
| 425 | cache_flush(); |
| 426 | out: |
| 427 | if (nd.dentry) |
| 428 | path_release(&nd); |
| 429 | if (dom) |
| 430 | auth_domain_put(dom); |
| 431 | if (buf) |
| 432 | kfree(buf); |
| 433 | return err; |
| 434 | } |
| 435 | |
| 436 | static void exp_flags(struct seq_file *m, int flag, int fsid, uid_t anonu, uid_t anong); |
| 437 | |
| 438 | static int svc_export_show(struct seq_file *m, |
| 439 | struct cache_detail *cd, |
| 440 | struct cache_head *h) |
| 441 | { |
| 442 | struct svc_export *exp ; |
| 443 | |
| 444 | if (h ==NULL) { |
| 445 | seq_puts(m, "#path domain(flags)\n"); |
| 446 | return 0; |
| 447 | } |
| 448 | exp = container_of(h, struct svc_export, h); |
| 449 | seq_path(m, exp->ex_mnt, exp->ex_dentry, " \t\n\\"); |
| 450 | seq_putc(m, '\t'); |
| 451 | seq_escape(m, exp->ex_client->name, " \t\n\\"); |
| 452 | seq_putc(m, '('); |
| 453 | if (test_bit(CACHE_VALID, &h->flags) && |
| 454 | !test_bit(CACHE_NEGATIVE, &h->flags)) |
| 455 | exp_flags(m, exp->ex_flags, exp->ex_fsid, |
| 456 | exp->ex_anon_uid, exp->ex_anon_gid); |
| 457 | seq_puts(m, ")\n"); |
| 458 | return 0; |
| 459 | } |
| 460 | struct cache_detail svc_export_cache = { |
Bruce Allan | f35279d | 2005-09-06 15:17:08 -0700 | [diff] [blame^] | 461 | .owner = THIS_MODULE, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 462 | .hash_size = EXPORT_HASHMAX, |
| 463 | .hash_table = export_table, |
| 464 | .name = "nfsd.export", |
| 465 | .cache_put = svc_export_put, |
| 466 | .cache_request = svc_export_request, |
| 467 | .cache_parse = svc_export_parse, |
| 468 | .cache_show = svc_export_show, |
| 469 | }; |
| 470 | |
| 471 | static inline int svc_export_match(struct svc_export *a, struct svc_export *b) |
| 472 | { |
| 473 | return a->ex_client == b->ex_client && |
| 474 | a->ex_dentry == b->ex_dentry && |
| 475 | a->ex_mnt == b->ex_mnt; |
| 476 | } |
| 477 | static inline void svc_export_init(struct svc_export *new, struct svc_export *item) |
| 478 | { |
| 479 | cache_get(&item->ex_client->h); |
| 480 | new->ex_client = item->ex_client; |
| 481 | new->ex_dentry = dget(item->ex_dentry); |
| 482 | new->ex_mnt = mntget(item->ex_mnt); |
| 483 | } |
| 484 | |
| 485 | static inline void svc_export_update(struct svc_export *new, struct svc_export *item) |
| 486 | { |
| 487 | new->ex_flags = item->ex_flags; |
| 488 | new->ex_anon_uid = item->ex_anon_uid; |
| 489 | new->ex_anon_gid = item->ex_anon_gid; |
| 490 | new->ex_fsid = item->ex_fsid; |
| 491 | } |
| 492 | |
| 493 | static DefineSimpleCacheLookup(svc_export,1) /* allow inplace updates */ |
| 494 | |
| 495 | |
| 496 | struct svc_expkey * |
| 497 | exp_find_key(svc_client *clp, int fsid_type, u32 *fsidv, struct cache_req *reqp) |
| 498 | { |
| 499 | struct svc_expkey key, *ek; |
| 500 | int err; |
| 501 | |
| 502 | if (!clp) |
| 503 | return NULL; |
| 504 | |
| 505 | key.ek_client = clp; |
| 506 | key.ek_fsidtype = fsid_type; |
| 507 | memcpy(key.ek_fsid, fsidv, key_len(fsid_type)); |
| 508 | |
| 509 | ek = svc_expkey_lookup(&key, 0); |
| 510 | if (ek != NULL) |
| 511 | if ((err = cache_check(&svc_expkey_cache, &ek->h, reqp))) |
| 512 | ek = ERR_PTR(err); |
| 513 | return ek; |
| 514 | } |
| 515 | |
| 516 | static int exp_set_key(svc_client *clp, int fsid_type, u32 *fsidv, |
| 517 | struct svc_export *exp) |
| 518 | { |
| 519 | struct svc_expkey key, *ek; |
| 520 | |
| 521 | key.ek_client = clp; |
| 522 | key.ek_fsidtype = fsid_type; |
| 523 | memcpy(key.ek_fsid, fsidv, key_len(fsid_type)); |
| 524 | key.ek_export = exp; |
| 525 | key.h.expiry_time = NEVER; |
| 526 | key.h.flags = 0; |
| 527 | |
| 528 | ek = svc_expkey_lookup(&key, 1); |
| 529 | if (ek) { |
| 530 | expkey_put(&ek->h, &svc_expkey_cache); |
| 531 | return 0; |
| 532 | } |
| 533 | return -ENOMEM; |
| 534 | } |
| 535 | |
| 536 | /* |
| 537 | * Find the client's export entry matching xdev/xino. |
| 538 | */ |
| 539 | static inline struct svc_expkey * |
| 540 | exp_get_key(svc_client *clp, dev_t dev, ino_t ino) |
| 541 | { |
| 542 | u32 fsidv[3]; |
| 543 | |
| 544 | if (old_valid_dev(dev)) { |
| 545 | mk_fsid_v0(fsidv, dev, ino); |
| 546 | return exp_find_key(clp, 0, fsidv, NULL); |
| 547 | } |
| 548 | mk_fsid_v3(fsidv, dev, ino); |
| 549 | return exp_find_key(clp, 3, fsidv, NULL); |
| 550 | } |
| 551 | |
| 552 | /* |
| 553 | * Find the client's export entry matching fsid |
| 554 | */ |
| 555 | static inline struct svc_expkey * |
| 556 | exp_get_fsid_key(svc_client *clp, int fsid) |
| 557 | { |
| 558 | u32 fsidv[2]; |
| 559 | |
| 560 | mk_fsid_v1(fsidv, fsid); |
| 561 | |
| 562 | return exp_find_key(clp, 1, fsidv, NULL); |
| 563 | } |
| 564 | |
| 565 | svc_export * |
| 566 | exp_get_by_name(svc_client *clp, struct vfsmount *mnt, struct dentry *dentry, |
| 567 | struct cache_req *reqp) |
| 568 | { |
| 569 | struct svc_export *exp, key; |
| 570 | |
| 571 | if (!clp) |
| 572 | return NULL; |
| 573 | |
| 574 | key.ex_client = clp; |
| 575 | key.ex_mnt = mnt; |
| 576 | key.ex_dentry = dentry; |
| 577 | |
| 578 | exp = svc_export_lookup(&key, 0); |
| 579 | if (exp != NULL) |
| 580 | switch (cache_check(&svc_export_cache, &exp->h, reqp)) { |
| 581 | case 0: break; |
| 582 | case -EAGAIN: |
| 583 | exp = ERR_PTR(-EAGAIN); |
| 584 | break; |
| 585 | default: |
| 586 | exp = NULL; |
| 587 | } |
| 588 | |
| 589 | return exp; |
| 590 | } |
| 591 | |
| 592 | /* |
| 593 | * Find the export entry for a given dentry. |
| 594 | */ |
| 595 | struct svc_export * |
| 596 | exp_parent(svc_client *clp, struct vfsmount *mnt, struct dentry *dentry, |
| 597 | struct cache_req *reqp) |
| 598 | { |
| 599 | svc_export *exp; |
| 600 | |
| 601 | dget(dentry); |
| 602 | exp = exp_get_by_name(clp, mnt, dentry, reqp); |
| 603 | |
| 604 | while (exp == NULL && !IS_ROOT(dentry)) { |
| 605 | struct dentry *parent; |
| 606 | |
| 607 | parent = dget_parent(dentry); |
| 608 | dput(dentry); |
| 609 | dentry = parent; |
| 610 | exp = exp_get_by_name(clp, mnt, dentry, reqp); |
| 611 | } |
| 612 | dput(dentry); |
| 613 | return exp; |
| 614 | } |
| 615 | |
| 616 | /* |
| 617 | * Hashtable locking. Write locks are placed only by user processes |
| 618 | * wanting to modify export information. |
| 619 | * Write locking only done in this file. Read locking |
| 620 | * needed externally. |
| 621 | */ |
| 622 | |
| 623 | static DECLARE_RWSEM(hash_sem); |
| 624 | |
| 625 | void |
| 626 | exp_readlock(void) |
| 627 | { |
| 628 | down_read(&hash_sem); |
| 629 | } |
| 630 | |
| 631 | static inline void |
| 632 | exp_writelock(void) |
| 633 | { |
| 634 | down_write(&hash_sem); |
| 635 | } |
| 636 | |
| 637 | void |
| 638 | exp_readunlock(void) |
| 639 | { |
| 640 | up_read(&hash_sem); |
| 641 | } |
| 642 | |
| 643 | static inline void |
| 644 | exp_writeunlock(void) |
| 645 | { |
| 646 | up_write(&hash_sem); |
| 647 | } |
| 648 | |
| 649 | static void exp_fsid_unhash(struct svc_export *exp) |
| 650 | { |
| 651 | struct svc_expkey *ek; |
| 652 | |
| 653 | if ((exp->ex_flags & NFSEXP_FSID) == 0) |
| 654 | return; |
| 655 | |
| 656 | ek = exp_get_fsid_key(exp->ex_client, exp->ex_fsid); |
| 657 | if (ek && !IS_ERR(ek)) { |
| 658 | ek->h.expiry_time = get_seconds()-1; |
| 659 | expkey_put(&ek->h, &svc_expkey_cache); |
| 660 | } |
| 661 | svc_expkey_cache.nextcheck = get_seconds(); |
| 662 | } |
| 663 | |
| 664 | static int exp_fsid_hash(svc_client *clp, struct svc_export *exp) |
| 665 | { |
| 666 | u32 fsid[2]; |
| 667 | |
| 668 | if ((exp->ex_flags & NFSEXP_FSID) == 0) |
| 669 | return 0; |
| 670 | |
| 671 | mk_fsid_v1(fsid, exp->ex_fsid); |
| 672 | return exp_set_key(clp, 1, fsid, exp); |
| 673 | } |
| 674 | |
| 675 | static int exp_hash(struct auth_domain *clp, struct svc_export *exp) |
| 676 | { |
| 677 | u32 fsid[2]; |
| 678 | struct inode *inode = exp->ex_dentry->d_inode; |
| 679 | dev_t dev = inode->i_sb->s_dev; |
| 680 | |
| 681 | if (old_valid_dev(dev)) { |
| 682 | mk_fsid_v0(fsid, dev, inode->i_ino); |
| 683 | return exp_set_key(clp, 0, fsid, exp); |
| 684 | } |
| 685 | mk_fsid_v3(fsid, dev, inode->i_ino); |
| 686 | return exp_set_key(clp, 3, fsid, exp); |
| 687 | } |
| 688 | |
| 689 | static void exp_unhash(struct svc_export *exp) |
| 690 | { |
| 691 | struct svc_expkey *ek; |
| 692 | struct inode *inode = exp->ex_dentry->d_inode; |
| 693 | |
| 694 | ek = exp_get_key(exp->ex_client, inode->i_sb->s_dev, inode->i_ino); |
| 695 | if (ek && !IS_ERR(ek)) { |
| 696 | ek->h.expiry_time = get_seconds()-1; |
| 697 | expkey_put(&ek->h, &svc_expkey_cache); |
| 698 | } |
| 699 | svc_expkey_cache.nextcheck = get_seconds(); |
| 700 | } |
| 701 | |
| 702 | /* |
| 703 | * Export a file system. |
| 704 | */ |
| 705 | int |
| 706 | exp_export(struct nfsctl_export *nxp) |
| 707 | { |
| 708 | svc_client *clp; |
| 709 | struct svc_export *exp = NULL; |
| 710 | struct svc_export new; |
| 711 | struct svc_expkey *fsid_key = NULL; |
| 712 | struct nameidata nd; |
| 713 | int err; |
| 714 | |
| 715 | /* Consistency check */ |
| 716 | err = -EINVAL; |
| 717 | if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) || |
| 718 | !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX)) |
| 719 | goto out; |
| 720 | |
| 721 | dprintk("exp_export called for %s:%s (%x/%ld fl %x).\n", |
| 722 | nxp->ex_client, nxp->ex_path, |
| 723 | (unsigned)nxp->ex_dev, (long)nxp->ex_ino, |
| 724 | nxp->ex_flags); |
| 725 | |
| 726 | /* Try to lock the export table for update */ |
| 727 | exp_writelock(); |
| 728 | |
| 729 | /* Look up client info */ |
| 730 | if (!(clp = auth_domain_find(nxp->ex_client))) |
| 731 | goto out_unlock; |
| 732 | |
| 733 | |
| 734 | /* Look up the dentry */ |
| 735 | err = path_lookup(nxp->ex_path, 0, &nd); |
| 736 | if (err) |
| 737 | goto out_unlock; |
| 738 | err = -EINVAL; |
| 739 | |
| 740 | exp = exp_get_by_name(clp, nd.mnt, nd.dentry, NULL); |
| 741 | |
| 742 | /* must make sure there won't be an ex_fsid clash */ |
| 743 | if ((nxp->ex_flags & NFSEXP_FSID) && |
| 744 | (fsid_key = exp_get_fsid_key(clp, nxp->ex_dev)) && |
| 745 | !IS_ERR(fsid_key) && |
| 746 | fsid_key->ek_export && |
| 747 | fsid_key->ek_export != exp) |
| 748 | goto finish; |
| 749 | |
| 750 | if (exp) { |
| 751 | /* just a flags/id/fsid update */ |
| 752 | |
| 753 | exp_fsid_unhash(exp); |
| 754 | exp->ex_flags = nxp->ex_flags; |
| 755 | exp->ex_anon_uid = nxp->ex_anon_uid; |
| 756 | exp->ex_anon_gid = nxp->ex_anon_gid; |
| 757 | exp->ex_fsid = nxp->ex_dev; |
| 758 | |
| 759 | err = exp_fsid_hash(clp, exp); |
| 760 | goto finish; |
| 761 | } |
| 762 | |
| 763 | err = check_export(nd.dentry->d_inode, nxp->ex_flags); |
| 764 | if (err) goto finish; |
| 765 | |
| 766 | err = -ENOMEM; |
| 767 | |
| 768 | dprintk("nfsd: creating export entry %p for client %p\n", exp, clp); |
| 769 | |
| 770 | new.h.expiry_time = NEVER; |
| 771 | new.h.flags = 0; |
| 772 | new.ex_client = clp; |
| 773 | new.ex_mnt = nd.mnt; |
| 774 | new.ex_dentry = nd.dentry; |
| 775 | new.ex_flags = nxp->ex_flags; |
| 776 | new.ex_anon_uid = nxp->ex_anon_uid; |
| 777 | new.ex_anon_gid = nxp->ex_anon_gid; |
| 778 | new.ex_fsid = nxp->ex_dev; |
| 779 | |
| 780 | exp = svc_export_lookup(&new, 1); |
| 781 | |
| 782 | if (exp == NULL) |
| 783 | goto finish; |
| 784 | |
| 785 | err = 0; |
| 786 | |
| 787 | if (exp_hash(clp, exp) || |
| 788 | exp_fsid_hash(clp, exp)) { |
| 789 | /* failed to create at least one index */ |
| 790 | exp_do_unexport(exp); |
| 791 | cache_flush(); |
| 792 | err = -ENOMEM; |
| 793 | } |
| 794 | |
| 795 | finish: |
| 796 | if (exp) |
| 797 | exp_put(exp); |
| 798 | if (fsid_key && !IS_ERR(fsid_key)) |
| 799 | expkey_put(&fsid_key->h, &svc_expkey_cache); |
| 800 | if (clp) |
| 801 | auth_domain_put(clp); |
| 802 | path_release(&nd); |
| 803 | out_unlock: |
| 804 | exp_writeunlock(); |
| 805 | out: |
| 806 | return err; |
| 807 | } |
| 808 | |
| 809 | /* |
| 810 | * Unexport a file system. The export entry has already |
| 811 | * been removed from the client's list of exported fs's. |
| 812 | */ |
| 813 | static void |
| 814 | exp_do_unexport(svc_export *unexp) |
| 815 | { |
| 816 | unexp->h.expiry_time = get_seconds()-1; |
| 817 | svc_export_cache.nextcheck = get_seconds(); |
| 818 | exp_unhash(unexp); |
| 819 | exp_fsid_unhash(unexp); |
| 820 | } |
| 821 | |
| 822 | |
| 823 | /* |
| 824 | * unexport syscall. |
| 825 | */ |
| 826 | int |
| 827 | exp_unexport(struct nfsctl_export *nxp) |
| 828 | { |
| 829 | struct auth_domain *dom; |
| 830 | svc_export *exp; |
| 831 | struct nameidata nd; |
| 832 | int err; |
| 833 | |
| 834 | /* Consistency check */ |
| 835 | if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) || |
| 836 | !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX)) |
| 837 | return -EINVAL; |
| 838 | |
| 839 | exp_writelock(); |
| 840 | |
| 841 | err = -EINVAL; |
| 842 | dom = auth_domain_find(nxp->ex_client); |
| 843 | if (!dom) { |
| 844 | dprintk("nfsd: unexport couldn't find %s\n", nxp->ex_client); |
| 845 | goto out_unlock; |
| 846 | } |
| 847 | |
| 848 | err = path_lookup(nxp->ex_path, 0, &nd); |
| 849 | if (err) |
| 850 | goto out_domain; |
| 851 | |
| 852 | err = -EINVAL; |
| 853 | exp = exp_get_by_name(dom, nd.mnt, nd.dentry, NULL); |
| 854 | path_release(&nd); |
| 855 | if (!exp) |
| 856 | goto out_domain; |
| 857 | |
| 858 | exp_do_unexport(exp); |
| 859 | exp_put(exp); |
| 860 | err = 0; |
| 861 | |
| 862 | out_domain: |
| 863 | auth_domain_put(dom); |
| 864 | cache_flush(); |
| 865 | out_unlock: |
| 866 | exp_writeunlock(); |
| 867 | return err; |
| 868 | } |
| 869 | |
| 870 | /* |
| 871 | * Obtain the root fh on behalf of a client. |
| 872 | * This could be done in user space, but I feel that it adds some safety |
| 873 | * since its harder to fool a kernel module than a user space program. |
| 874 | */ |
| 875 | int |
| 876 | exp_rootfh(svc_client *clp, char *path, struct knfsd_fh *f, int maxsize) |
| 877 | { |
| 878 | struct svc_export *exp; |
| 879 | struct nameidata nd; |
| 880 | struct inode *inode; |
| 881 | struct svc_fh fh; |
| 882 | int err; |
| 883 | |
| 884 | err = -EPERM; |
| 885 | /* NB: we probably ought to check that it's NUL-terminated */ |
| 886 | if (path_lookup(path, 0, &nd)) { |
| 887 | printk("nfsd: exp_rootfh path not found %s", path); |
| 888 | return err; |
| 889 | } |
| 890 | inode = nd.dentry->d_inode; |
| 891 | |
| 892 | dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n", |
| 893 | path, nd.dentry, clp->name, |
| 894 | inode->i_sb->s_id, inode->i_ino); |
| 895 | exp = exp_parent(clp, nd.mnt, nd.dentry, NULL); |
| 896 | if (!exp) { |
| 897 | dprintk("nfsd: exp_rootfh export not found.\n"); |
| 898 | goto out; |
| 899 | } |
| 900 | |
| 901 | /* |
| 902 | * fh must be initialized before calling fh_compose |
| 903 | */ |
| 904 | fh_init(&fh, maxsize); |
| 905 | if (fh_compose(&fh, exp, nd.dentry, NULL)) |
| 906 | err = -EINVAL; |
| 907 | else |
| 908 | err = 0; |
| 909 | memcpy(f, &fh.fh_handle, sizeof(struct knfsd_fh)); |
| 910 | fh_put(&fh); |
| 911 | exp_put(exp); |
| 912 | out: |
| 913 | path_release(&nd); |
| 914 | return err; |
| 915 | } |
| 916 | |
| 917 | /* |
| 918 | * Called when we need the filehandle for the root of the pseudofs, |
| 919 | * for a given NFSv4 client. The root is defined to be the |
| 920 | * export point with fsid==0 |
| 921 | */ |
| 922 | int |
| 923 | exp_pseudoroot(struct auth_domain *clp, struct svc_fh *fhp, |
| 924 | struct cache_req *creq) |
| 925 | { |
| 926 | struct svc_expkey *fsid_key; |
| 927 | int rv; |
| 928 | u32 fsidv[2]; |
| 929 | |
| 930 | mk_fsid_v1(fsidv, 0); |
| 931 | |
| 932 | fsid_key = exp_find_key(clp, 1, fsidv, creq); |
| 933 | if (IS_ERR(fsid_key) && PTR_ERR(fsid_key) == -EAGAIN) |
| 934 | return nfserr_dropit; |
| 935 | if (!fsid_key || IS_ERR(fsid_key)) |
| 936 | return nfserr_perm; |
| 937 | |
| 938 | rv = fh_compose(fhp, fsid_key->ek_export, |
| 939 | fsid_key->ek_export->ex_dentry, NULL); |
| 940 | expkey_put(&fsid_key->h, &svc_expkey_cache); |
| 941 | return rv; |
| 942 | } |
| 943 | |
| 944 | /* Iterator */ |
| 945 | |
| 946 | static void *e_start(struct seq_file *m, loff_t *pos) |
| 947 | { |
| 948 | loff_t n = *pos; |
| 949 | unsigned hash, export; |
| 950 | struct cache_head *ch; |
| 951 | |
| 952 | exp_readlock(); |
| 953 | read_lock(&svc_export_cache.hash_lock); |
| 954 | if (!n--) |
| 955 | return (void *)1; |
| 956 | hash = n >> 32; |
| 957 | export = n & ((1LL<<32) - 1); |
| 958 | |
| 959 | |
| 960 | for (ch=export_table[hash]; ch; ch=ch->next) |
| 961 | if (!export--) |
| 962 | return ch; |
| 963 | n &= ~((1LL<<32) - 1); |
| 964 | do { |
| 965 | hash++; |
| 966 | n += 1LL<<32; |
| 967 | } while(hash < EXPORT_HASHMAX && export_table[hash]==NULL); |
| 968 | if (hash >= EXPORT_HASHMAX) |
| 969 | return NULL; |
| 970 | *pos = n+1; |
| 971 | return export_table[hash]; |
| 972 | } |
| 973 | |
| 974 | static void *e_next(struct seq_file *m, void *p, loff_t *pos) |
| 975 | { |
| 976 | struct cache_head *ch = p; |
| 977 | int hash = (*pos >> 32); |
| 978 | |
| 979 | if (p == (void *)1) |
| 980 | hash = 0; |
| 981 | else if (ch->next == NULL) { |
| 982 | hash++; |
| 983 | *pos += 1LL<<32; |
| 984 | } else { |
| 985 | ++*pos; |
| 986 | return ch->next; |
| 987 | } |
| 988 | *pos &= ~((1LL<<32) - 1); |
| 989 | while (hash < EXPORT_HASHMAX && export_table[hash] == NULL) { |
| 990 | hash++; |
| 991 | *pos += 1LL<<32; |
| 992 | } |
| 993 | if (hash >= EXPORT_HASHMAX) |
| 994 | return NULL; |
| 995 | ++*pos; |
| 996 | return export_table[hash]; |
| 997 | } |
| 998 | |
| 999 | static void e_stop(struct seq_file *m, void *p) |
| 1000 | { |
| 1001 | read_unlock(&svc_export_cache.hash_lock); |
| 1002 | exp_readunlock(); |
| 1003 | } |
| 1004 | |
| 1005 | static struct flags { |
| 1006 | int flag; |
| 1007 | char *name[2]; |
| 1008 | } expflags[] = { |
| 1009 | { NFSEXP_READONLY, {"ro", "rw"}}, |
| 1010 | { NFSEXP_INSECURE_PORT, {"insecure", ""}}, |
| 1011 | { NFSEXP_ROOTSQUASH, {"root_squash", "no_root_squash"}}, |
| 1012 | { NFSEXP_ALLSQUASH, {"all_squash", ""}}, |
| 1013 | { NFSEXP_ASYNC, {"async", "sync"}}, |
| 1014 | { NFSEXP_GATHERED_WRITES, {"wdelay", "no_wdelay"}}, |
| 1015 | { NFSEXP_NOHIDE, {"nohide", ""}}, |
| 1016 | { NFSEXP_CROSSMOUNT, {"crossmnt", ""}}, |
| 1017 | { NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}}, |
| 1018 | { NFSEXP_NOAUTHNLM, {"insecure_locks", ""}}, |
| 1019 | #ifdef MSNFS |
| 1020 | { NFSEXP_MSNFS, {"msnfs", ""}}, |
| 1021 | #endif |
| 1022 | { 0, {"", ""}} |
| 1023 | }; |
| 1024 | |
| 1025 | static void exp_flags(struct seq_file *m, int flag, int fsid, uid_t anonu, uid_t anong) |
| 1026 | { |
| 1027 | int first = 0; |
| 1028 | struct flags *flg; |
| 1029 | |
| 1030 | for (flg = expflags; flg->flag; flg++) { |
| 1031 | int state = (flg->flag & flag)?0:1; |
| 1032 | if (*flg->name[state]) |
| 1033 | seq_printf(m, "%s%s", first++?",":"", flg->name[state]); |
| 1034 | } |
| 1035 | if (flag & NFSEXP_FSID) |
| 1036 | seq_printf(m, "%sfsid=%d", first++?",":"", fsid); |
| 1037 | if (anonu != (uid_t)-2 && anonu != (0x10000-2)) |
| 1038 | seq_printf(m, "%sanonuid=%d", first++?",":"", anonu); |
| 1039 | if (anong != (gid_t)-2 && anong != (0x10000-2)) |
| 1040 | seq_printf(m, "%sanongid=%d", first++?",":"", anong); |
| 1041 | } |
| 1042 | |
| 1043 | static int e_show(struct seq_file *m, void *p) |
| 1044 | { |
| 1045 | struct cache_head *cp = p; |
| 1046 | struct svc_export *exp = container_of(cp, struct svc_export, h); |
| 1047 | svc_client *clp; |
| 1048 | |
| 1049 | if (p == (void *)1) { |
| 1050 | seq_puts(m, "# Version 1.1\n"); |
| 1051 | seq_puts(m, "# Path Client(Flags) # IPs\n"); |
| 1052 | return 0; |
| 1053 | } |
| 1054 | |
| 1055 | clp = exp->ex_client; |
| 1056 | cache_get(&exp->h); |
| 1057 | if (cache_check(&svc_export_cache, &exp->h, NULL)) |
| 1058 | return 0; |
| 1059 | if (cache_put(&exp->h, &svc_export_cache)) BUG(); |
| 1060 | return svc_export_show(m, &svc_export_cache, cp); |
| 1061 | } |
| 1062 | |
| 1063 | struct seq_operations nfs_exports_op = { |
| 1064 | .start = e_start, |
| 1065 | .next = e_next, |
| 1066 | .stop = e_stop, |
| 1067 | .show = e_show, |
| 1068 | }; |
| 1069 | |
| 1070 | /* |
| 1071 | * Add or modify a client. |
| 1072 | * Change requests may involve the list of host addresses. The list of |
| 1073 | * exports and possibly existing uid maps are left untouched. |
| 1074 | */ |
| 1075 | int |
| 1076 | exp_addclient(struct nfsctl_client *ncp) |
| 1077 | { |
| 1078 | struct auth_domain *dom; |
| 1079 | int i, err; |
| 1080 | |
| 1081 | /* First, consistency check. */ |
| 1082 | err = -EINVAL; |
| 1083 | if (! exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX)) |
| 1084 | goto out; |
| 1085 | if (ncp->cl_naddr > NFSCLNT_ADDRMAX) |
| 1086 | goto out; |
| 1087 | |
| 1088 | /* Lock the hashtable */ |
| 1089 | exp_writelock(); |
| 1090 | |
| 1091 | dom = unix_domain_find(ncp->cl_ident); |
| 1092 | |
| 1093 | err = -ENOMEM; |
| 1094 | if (!dom) |
| 1095 | goto out_unlock; |
| 1096 | |
| 1097 | /* Insert client into hashtable. */ |
| 1098 | for (i = 0; i < ncp->cl_naddr; i++) |
| 1099 | auth_unix_add_addr(ncp->cl_addrlist[i], dom); |
| 1100 | |
| 1101 | auth_unix_forget_old(dom); |
| 1102 | auth_domain_put(dom); |
| 1103 | |
| 1104 | err = 0; |
| 1105 | |
| 1106 | out_unlock: |
| 1107 | exp_writeunlock(); |
| 1108 | out: |
| 1109 | return err; |
| 1110 | } |
| 1111 | |
| 1112 | /* |
| 1113 | * Delete a client given an identifier. |
| 1114 | */ |
| 1115 | int |
| 1116 | exp_delclient(struct nfsctl_client *ncp) |
| 1117 | { |
| 1118 | int err; |
| 1119 | struct auth_domain *dom; |
| 1120 | |
| 1121 | err = -EINVAL; |
| 1122 | if (!exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX)) |
| 1123 | goto out; |
| 1124 | |
| 1125 | /* Lock the hashtable */ |
| 1126 | exp_writelock(); |
| 1127 | |
| 1128 | dom = auth_domain_find(ncp->cl_ident); |
| 1129 | /* just make sure that no addresses work |
| 1130 | * and that it will expire soon |
| 1131 | */ |
| 1132 | if (dom) { |
| 1133 | err = auth_unix_forget_old(dom); |
| 1134 | dom->h.expiry_time = get_seconds(); |
| 1135 | auth_domain_put(dom); |
| 1136 | } |
| 1137 | |
| 1138 | exp_writeunlock(); |
| 1139 | out: |
| 1140 | return err; |
| 1141 | } |
| 1142 | |
| 1143 | /* |
| 1144 | * Verify that string is non-empty and does not exceed max length. |
| 1145 | */ |
| 1146 | static int |
| 1147 | exp_verify_string(char *cp, int max) |
| 1148 | { |
| 1149 | int i; |
| 1150 | |
| 1151 | for (i = 0; i < max; i++) |
| 1152 | if (!cp[i]) |
| 1153 | return i; |
| 1154 | cp[i] = 0; |
| 1155 | printk(KERN_NOTICE "nfsd: couldn't validate string %s\n", cp); |
| 1156 | return 0; |
| 1157 | } |
| 1158 | |
| 1159 | /* |
| 1160 | * Initialize the exports module. |
| 1161 | */ |
| 1162 | void |
| 1163 | nfsd_export_init(void) |
| 1164 | { |
| 1165 | dprintk("nfsd: initializing export module.\n"); |
| 1166 | |
| 1167 | cache_register(&svc_export_cache); |
| 1168 | cache_register(&svc_expkey_cache); |
| 1169 | |
| 1170 | } |
| 1171 | |
| 1172 | /* |
| 1173 | * Flush exports table - called when last nfsd thread is killed |
| 1174 | */ |
| 1175 | void |
| 1176 | nfsd_export_flush(void) |
| 1177 | { |
| 1178 | exp_writelock(); |
| 1179 | cache_purge(&svc_expkey_cache); |
| 1180 | cache_purge(&svc_export_cache); |
| 1181 | exp_writeunlock(); |
| 1182 | } |
| 1183 | |
| 1184 | /* |
| 1185 | * Shutdown the exports module. |
| 1186 | */ |
| 1187 | void |
| 1188 | nfsd_export_shutdown(void) |
| 1189 | { |
| 1190 | |
| 1191 | dprintk("nfsd: shutting down export module.\n"); |
| 1192 | |
| 1193 | exp_writelock(); |
| 1194 | |
| 1195 | if (cache_unregister(&svc_expkey_cache)) |
| 1196 | printk(KERN_ERR "nfsd: failed to unregister expkey cache\n"); |
| 1197 | if (cache_unregister(&svc_export_cache)) |
| 1198 | printk(KERN_ERR "nfsd: failed to unregister export cache\n"); |
| 1199 | svcauth_unix_purge(); |
| 1200 | |
| 1201 | exp_writeunlock(); |
| 1202 | dprintk("nfsd: export shutdown complete.\n"); |
| 1203 | } |