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) && |
NeilBrown | eab7e2e | 2006-03-27 01:15:00 -0800 | [diff] [blame] | 76 | !test_bit(CACHE_NEGATIVE, &item->flags)) { |
| 77 | dput(key->ek_dentry); |
| 78 | mntput(key->ek_mnt); |
| 79 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | auth_domain_put(key->ek_client); |
| 81 | kfree(key); |
| 82 | } |
| 83 | } |
| 84 | |
| 85 | static void expkey_request(struct cache_detail *cd, |
| 86 | struct cache_head *h, |
| 87 | char **bpp, int *blen) |
| 88 | { |
| 89 | /* client fsidtype \xfsid */ |
| 90 | struct svc_expkey *ek = container_of(h, struct svc_expkey, h); |
| 91 | char type[5]; |
| 92 | |
| 93 | qword_add(bpp, blen, ek->ek_client->name); |
| 94 | snprintf(type, 5, "%d", ek->ek_fsidtype); |
| 95 | qword_add(bpp, blen, type); |
| 96 | qword_addhex(bpp, blen, (char*)ek->ek_fsid, key_len(ek->ek_fsidtype)); |
| 97 | (*bpp)[-1] = '\n'; |
| 98 | } |
| 99 | |
| 100 | static struct svc_expkey *svc_expkey_lookup(struct svc_expkey *, int); |
| 101 | static int expkey_parse(struct cache_detail *cd, char *mesg, int mlen) |
| 102 | { |
| 103 | /* client fsidtype fsid [path] */ |
| 104 | char *buf; |
| 105 | int len; |
| 106 | struct auth_domain *dom = NULL; |
| 107 | int err; |
| 108 | int fsidtype; |
| 109 | char *ep; |
| 110 | struct svc_expkey key; |
| 111 | |
| 112 | if (mesg[mlen-1] != '\n') |
| 113 | return -EINVAL; |
| 114 | mesg[mlen-1] = 0; |
| 115 | |
| 116 | buf = kmalloc(PAGE_SIZE, GFP_KERNEL); |
| 117 | err = -ENOMEM; |
| 118 | if (!buf) goto out; |
| 119 | |
| 120 | err = -EINVAL; |
| 121 | if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0) |
| 122 | goto out; |
| 123 | |
| 124 | err = -ENOENT; |
| 125 | dom = auth_domain_find(buf); |
| 126 | if (!dom) |
| 127 | goto out; |
| 128 | dprintk("found domain %s\n", buf); |
| 129 | |
| 130 | err = -EINVAL; |
| 131 | if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0) |
| 132 | goto out; |
| 133 | fsidtype = simple_strtoul(buf, &ep, 10); |
| 134 | if (*ep) |
| 135 | goto out; |
| 136 | dprintk("found fsidtype %d\n", fsidtype); |
| 137 | if (fsidtype > 2) |
| 138 | goto out; |
| 139 | if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0) |
| 140 | goto out; |
| 141 | dprintk("found fsid length %d\n", len); |
| 142 | if (len != key_len(fsidtype)) |
| 143 | goto out; |
| 144 | |
| 145 | /* OK, we seem to have a valid key */ |
| 146 | key.h.flags = 0; |
| 147 | key.h.expiry_time = get_expiry(&mesg); |
| 148 | if (key.h.expiry_time == 0) |
| 149 | goto out; |
| 150 | |
| 151 | key.ek_client = dom; |
| 152 | key.ek_fsidtype = fsidtype; |
| 153 | memcpy(key.ek_fsid, buf, len); |
| 154 | |
| 155 | /* now we want a pathname, or empty meaning NEGATIVE */ |
| 156 | if ((len=qword_get(&mesg, buf, PAGE_SIZE)) < 0) |
| 157 | goto out; |
| 158 | dprintk("Path seems to be <%s>\n", buf); |
| 159 | err = 0; |
| 160 | if (len == 0) { |
| 161 | struct svc_expkey *ek; |
| 162 | set_bit(CACHE_NEGATIVE, &key.h.flags); |
| 163 | ek = svc_expkey_lookup(&key, 1); |
| 164 | if (ek) |
| 165 | expkey_put(&ek->h, &svc_expkey_cache); |
| 166 | } else { |
| 167 | struct nameidata nd; |
| 168 | struct svc_expkey *ek; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 169 | err = path_lookup(buf, 0, &nd); |
| 170 | if (err) |
| 171 | goto out; |
| 172 | |
| 173 | dprintk("Found the path %s\n", buf); |
NeilBrown | eab7e2e | 2006-03-27 01:15:00 -0800 | [diff] [blame] | 174 | key.ek_mnt = nd.mnt; |
| 175 | key.ek_dentry = nd.dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | |
| 177 | ek = svc_expkey_lookup(&key, 1); |
| 178 | if (ek) |
| 179 | expkey_put(&ek->h, &svc_expkey_cache); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 181 | path_release(&nd); |
| 182 | } |
| 183 | cache_flush(); |
| 184 | out: |
| 185 | if (dom) |
| 186 | auth_domain_put(dom); |
Jesper Juhl | f99d49a | 2005-11-07 01:01:34 -0800 | [diff] [blame] | 187 | kfree(buf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 188 | return err; |
| 189 | } |
| 190 | |
| 191 | static int expkey_show(struct seq_file *m, |
| 192 | struct cache_detail *cd, |
| 193 | struct cache_head *h) |
| 194 | { |
| 195 | struct svc_expkey *ek ; |
| 196 | |
| 197 | if (h ==NULL) { |
| 198 | seq_puts(m, "#domain fsidtype fsid [path]\n"); |
| 199 | return 0; |
| 200 | } |
| 201 | ek = container_of(h, struct svc_expkey, h); |
| 202 | seq_printf(m, "%s %d 0x%08x", ek->ek_client->name, |
| 203 | ek->ek_fsidtype, ek->ek_fsid[0]); |
| 204 | if (ek->ek_fsidtype != 1) |
| 205 | seq_printf(m, "%08x", ek->ek_fsid[1]); |
| 206 | if (ek->ek_fsidtype == 2) |
| 207 | seq_printf(m, "%08x", ek->ek_fsid[2]); |
| 208 | if (test_bit(CACHE_VALID, &h->flags) && |
| 209 | !test_bit(CACHE_NEGATIVE, &h->flags)) { |
| 210 | seq_printf(m, " "); |
NeilBrown | eab7e2e | 2006-03-27 01:15:00 -0800 | [diff] [blame] | 211 | seq_path(m, ek->ek_mnt, ek->ek_dentry, "\\ \t\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | } |
| 213 | seq_printf(m, "\n"); |
| 214 | return 0; |
| 215 | } |
| 216 | |
| 217 | struct cache_detail svc_expkey_cache = { |
Bruce Allan | f35279d | 2005-09-06 15:17:08 -0700 | [diff] [blame] | 218 | .owner = THIS_MODULE, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 219 | .hash_size = EXPKEY_HASHMAX, |
| 220 | .hash_table = expkey_table, |
| 221 | .name = "nfsd.fh", |
| 222 | .cache_put = expkey_put, |
| 223 | .cache_request = expkey_request, |
| 224 | .cache_parse = expkey_parse, |
| 225 | .cache_show = expkey_show, |
| 226 | }; |
| 227 | |
| 228 | static inline int svc_expkey_match (struct svc_expkey *a, struct svc_expkey *b) |
| 229 | { |
| 230 | if (a->ek_fsidtype != b->ek_fsidtype || |
| 231 | a->ek_client != b->ek_client || |
| 232 | memcmp(a->ek_fsid, b->ek_fsid, key_len(a->ek_fsidtype)) != 0) |
| 233 | return 0; |
| 234 | return 1; |
| 235 | } |
| 236 | |
| 237 | static inline void svc_expkey_init(struct svc_expkey *new, struct svc_expkey *item) |
| 238 | { |
NeilBrown | efc36aa | 2006-03-27 01:14:59 -0800 | [diff] [blame] | 239 | kref_get(&item->ek_client->ref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 240 | new->ek_client = item->ek_client; |
| 241 | new->ek_fsidtype = item->ek_fsidtype; |
| 242 | new->ek_fsid[0] = item->ek_fsid[0]; |
| 243 | new->ek_fsid[1] = item->ek_fsid[1]; |
| 244 | new->ek_fsid[2] = item->ek_fsid[2]; |
| 245 | } |
| 246 | |
| 247 | static inline void svc_expkey_update(struct svc_expkey *new, struct svc_expkey *item) |
| 248 | { |
NeilBrown | eab7e2e | 2006-03-27 01:15:00 -0800 | [diff] [blame] | 249 | new->ek_mnt = mntget(item->ek_mnt); |
| 250 | new->ek_dentry = dget(item->ek_dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 251 | } |
| 252 | |
NeilBrown | 7d317f2 | 2006-03-27 01:15:01 -0800 | [diff] [blame] | 253 | static DefineSimpleCacheLookup(svc_expkey, svc_expkey) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 254 | |
| 255 | #define EXPORT_HASHBITS 8 |
| 256 | #define EXPORT_HASHMAX (1<< EXPORT_HASHBITS) |
| 257 | #define EXPORT_HASHMASK (EXPORT_HASHMAX -1) |
| 258 | |
| 259 | static struct cache_head *export_table[EXPORT_HASHMAX]; |
| 260 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 261 | void svc_export_put(struct cache_head *item, struct cache_detail *cd) |
| 262 | { |
| 263 | if (cache_put(item, cd)) { |
| 264 | struct svc_export *exp = container_of(item, struct svc_export, h); |
| 265 | dput(exp->ex_dentry); |
| 266 | mntput(exp->ex_mnt); |
| 267 | auth_domain_put(exp->ex_client); |
| 268 | kfree(exp); |
| 269 | } |
| 270 | } |
| 271 | |
| 272 | static void svc_export_request(struct cache_detail *cd, |
| 273 | struct cache_head *h, |
| 274 | char **bpp, int *blen) |
| 275 | { |
| 276 | /* client path */ |
| 277 | struct svc_export *exp = container_of(h, struct svc_export, h); |
| 278 | char *pth; |
| 279 | |
| 280 | qword_add(bpp, blen, exp->ex_client->name); |
| 281 | pth = d_path(exp->ex_dentry, exp->ex_mnt, *bpp, *blen); |
| 282 | if (IS_ERR(pth)) { |
| 283 | /* is this correct? */ |
| 284 | (*bpp)[0] = '\n'; |
| 285 | return; |
| 286 | } |
| 287 | qword_add(bpp, blen, pth); |
| 288 | (*bpp)[-1] = '\n'; |
| 289 | } |
| 290 | |
NeilBrown | 4f7774c | 2006-03-27 01:15:03 -0800 | [diff] [blame^] | 291 | struct svc_export *svc_export_update(struct svc_export *new, struct svc_export *old); |
| 292 | static struct svc_export *svc_export_lookup(struct svc_export *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 293 | |
| 294 | static int check_export(struct inode *inode, int flags) |
| 295 | { |
| 296 | |
| 297 | /* We currently export only dirs and regular files. |
| 298 | * This is what umountd does. |
| 299 | */ |
| 300 | if (!S_ISDIR(inode->i_mode) && |
| 301 | !S_ISREG(inode->i_mode)) |
| 302 | return -ENOTDIR; |
| 303 | |
| 304 | /* There are two requirements on a filesystem to be exportable. |
| 305 | * 1: We must be able to identify the filesystem from a number. |
| 306 | * either a device number (so FS_REQUIRES_DEV needed) |
| 307 | * or an FSID number (so NFSEXP_FSID needed). |
| 308 | * 2: We must be able to find an inode from a filehandle. |
| 309 | * This means that s_export_op must be set. |
| 310 | */ |
| 311 | if (!(inode->i_sb->s_type->fs_flags & FS_REQUIRES_DEV) && |
| 312 | !(flags & NFSEXP_FSID)) { |
| 313 | dprintk("exp_export: export of non-dev fs without fsid"); |
| 314 | return -EINVAL; |
| 315 | } |
| 316 | if (!inode->i_sb->s_export_op) { |
| 317 | dprintk("exp_export: export of invalid fs type.\n"); |
| 318 | return -EINVAL; |
| 319 | } |
| 320 | |
| 321 | /* Ok, we can export it */; |
| 322 | if (!inode->i_sb->s_export_op->find_exported_dentry) |
| 323 | inode->i_sb->s_export_op->find_exported_dentry = |
| 324 | find_exported_dentry; |
| 325 | return 0; |
| 326 | |
| 327 | } |
| 328 | |
| 329 | static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen) |
| 330 | { |
| 331 | /* client path expiry [flags anonuid anongid fsid] */ |
| 332 | char *buf; |
| 333 | int len; |
| 334 | int err; |
| 335 | struct auth_domain *dom = NULL; |
| 336 | struct nameidata nd; |
| 337 | struct svc_export exp, *expp; |
| 338 | int an_int; |
| 339 | |
| 340 | nd.dentry = NULL; |
| 341 | |
| 342 | if (mesg[mlen-1] != '\n') |
| 343 | return -EINVAL; |
| 344 | mesg[mlen-1] = 0; |
| 345 | |
| 346 | buf = kmalloc(PAGE_SIZE, GFP_KERNEL); |
| 347 | err = -ENOMEM; |
| 348 | if (!buf) goto out; |
| 349 | |
| 350 | /* client */ |
| 351 | len = qword_get(&mesg, buf, PAGE_SIZE); |
| 352 | err = -EINVAL; |
| 353 | if (len <= 0) goto out; |
| 354 | |
| 355 | err = -ENOENT; |
| 356 | dom = auth_domain_find(buf); |
| 357 | if (!dom) |
| 358 | goto out; |
| 359 | |
| 360 | /* path */ |
| 361 | err = -EINVAL; |
| 362 | if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0) |
| 363 | goto out; |
| 364 | err = path_lookup(buf, 0, &nd); |
| 365 | if (err) goto out; |
| 366 | |
| 367 | exp.h.flags = 0; |
| 368 | exp.ex_client = dom; |
| 369 | exp.ex_mnt = nd.mnt; |
| 370 | exp.ex_dentry = nd.dentry; |
| 371 | |
| 372 | /* expiry */ |
| 373 | err = -EINVAL; |
| 374 | exp.h.expiry_time = get_expiry(&mesg); |
| 375 | if (exp.h.expiry_time == 0) |
| 376 | goto out; |
| 377 | |
| 378 | /* flags */ |
| 379 | err = get_int(&mesg, &an_int); |
| 380 | if (err == -ENOENT) |
| 381 | set_bit(CACHE_NEGATIVE, &exp.h.flags); |
| 382 | else { |
| 383 | if (err || an_int < 0) goto out; |
| 384 | exp.ex_flags= an_int; |
| 385 | |
| 386 | /* anon uid */ |
| 387 | err = get_int(&mesg, &an_int); |
| 388 | if (err) goto out; |
| 389 | exp.ex_anon_uid= an_int; |
| 390 | |
| 391 | /* anon gid */ |
| 392 | err = get_int(&mesg, &an_int); |
| 393 | if (err) goto out; |
| 394 | exp.ex_anon_gid= an_int; |
| 395 | |
| 396 | /* fsid */ |
| 397 | err = get_int(&mesg, &an_int); |
| 398 | if (err) goto out; |
| 399 | exp.ex_fsid = an_int; |
| 400 | |
| 401 | err = check_export(nd.dentry->d_inode, exp.ex_flags); |
| 402 | if (err) goto out; |
| 403 | } |
| 404 | |
NeilBrown | 4f7774c | 2006-03-27 01:15:03 -0800 | [diff] [blame^] | 405 | expp = svc_export_lookup(&exp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 406 | if (expp) |
NeilBrown | 4f7774c | 2006-03-27 01:15:03 -0800 | [diff] [blame^] | 407 | expp = svc_export_update(&exp, expp); |
| 408 | else |
| 409 | err = -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 410 | cache_flush(); |
NeilBrown | 4f7774c | 2006-03-27 01:15:03 -0800 | [diff] [blame^] | 411 | if (expp == NULL) |
| 412 | err = -ENOMEM; |
| 413 | else |
| 414 | exp_put(expp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 415 | out: |
| 416 | if (nd.dentry) |
| 417 | path_release(&nd); |
| 418 | if (dom) |
| 419 | auth_domain_put(dom); |
Jesper Juhl | f99d49a | 2005-11-07 01:01:34 -0800 | [diff] [blame] | 420 | kfree(buf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 421 | return err; |
| 422 | } |
| 423 | |
| 424 | static void exp_flags(struct seq_file *m, int flag, int fsid, uid_t anonu, uid_t anong); |
| 425 | |
| 426 | static int svc_export_show(struct seq_file *m, |
| 427 | struct cache_detail *cd, |
| 428 | struct cache_head *h) |
| 429 | { |
| 430 | struct svc_export *exp ; |
| 431 | |
| 432 | if (h ==NULL) { |
| 433 | seq_puts(m, "#path domain(flags)\n"); |
| 434 | return 0; |
| 435 | } |
| 436 | exp = container_of(h, struct svc_export, h); |
| 437 | seq_path(m, exp->ex_mnt, exp->ex_dentry, " \t\n\\"); |
| 438 | seq_putc(m, '\t'); |
| 439 | seq_escape(m, exp->ex_client->name, " \t\n\\"); |
| 440 | seq_putc(m, '('); |
| 441 | if (test_bit(CACHE_VALID, &h->flags) && |
| 442 | !test_bit(CACHE_NEGATIVE, &h->flags)) |
| 443 | exp_flags(m, exp->ex_flags, exp->ex_fsid, |
| 444 | exp->ex_anon_uid, exp->ex_anon_gid); |
| 445 | seq_puts(m, ")\n"); |
| 446 | return 0; |
| 447 | } |
NeilBrown | 4f7774c | 2006-03-27 01:15:03 -0800 | [diff] [blame^] | 448 | static int svc_export_match(struct cache_head *a, struct cache_head *b) |
| 449 | { |
| 450 | struct svc_export *orig = container_of(a, struct svc_export, h); |
| 451 | struct svc_export *new = container_of(b, struct svc_export, h); |
| 452 | return orig->ex_client == new->ex_client && |
| 453 | orig->ex_dentry == new->ex_dentry && |
| 454 | orig->ex_mnt == new->ex_mnt; |
| 455 | } |
| 456 | |
| 457 | static void svc_export_init(struct cache_head *cnew, struct cache_head *citem) |
| 458 | { |
| 459 | struct svc_export *new = container_of(cnew, struct svc_export, h); |
| 460 | struct svc_export *item = container_of(citem, struct svc_export, h); |
| 461 | |
| 462 | kref_get(&item->ex_client->ref); |
| 463 | new->ex_client = item->ex_client; |
| 464 | new->ex_dentry = dget(item->ex_dentry); |
| 465 | new->ex_mnt = mntget(item->ex_mnt); |
| 466 | } |
| 467 | |
| 468 | static void export_update(struct cache_head *cnew, struct cache_head *citem) |
| 469 | { |
| 470 | struct svc_export *new = container_of(cnew, struct svc_export, h); |
| 471 | struct svc_export *item = container_of(citem, struct svc_export, h); |
| 472 | |
| 473 | new->ex_flags = item->ex_flags; |
| 474 | new->ex_anon_uid = item->ex_anon_uid; |
| 475 | new->ex_anon_gid = item->ex_anon_gid; |
| 476 | new->ex_fsid = item->ex_fsid; |
| 477 | } |
| 478 | |
| 479 | static struct cache_head *svc_export_alloc(void) |
| 480 | { |
| 481 | struct svc_export *i = kmalloc(sizeof(*i), GFP_KERNEL); |
| 482 | if (i) |
| 483 | return &i->h; |
| 484 | else |
| 485 | return NULL; |
| 486 | } |
| 487 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 488 | struct cache_detail svc_export_cache = { |
Bruce Allan | f35279d | 2005-09-06 15:17:08 -0700 | [diff] [blame] | 489 | .owner = THIS_MODULE, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 490 | .hash_size = EXPORT_HASHMAX, |
| 491 | .hash_table = export_table, |
| 492 | .name = "nfsd.export", |
| 493 | .cache_put = svc_export_put, |
| 494 | .cache_request = svc_export_request, |
| 495 | .cache_parse = svc_export_parse, |
| 496 | .cache_show = svc_export_show, |
NeilBrown | 4f7774c | 2006-03-27 01:15:03 -0800 | [diff] [blame^] | 497 | .match = svc_export_match, |
| 498 | .init = svc_export_init, |
| 499 | .update = export_update, |
| 500 | .alloc = svc_export_alloc, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 501 | }; |
| 502 | |
NeilBrown | 4f7774c | 2006-03-27 01:15:03 -0800 | [diff] [blame^] | 503 | static struct svc_export * |
| 504 | svc_export_lookup(struct svc_export *exp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 505 | { |
NeilBrown | 4f7774c | 2006-03-27 01:15:03 -0800 | [diff] [blame^] | 506 | struct cache_head *ch; |
| 507 | int hash; |
| 508 | hash = hash_ptr(exp->ex_client, EXPORT_HASHBITS); |
| 509 | hash ^= hash_ptr(exp->ex_dentry, EXPORT_HASHBITS); |
| 510 | hash ^= hash_ptr(exp->ex_mnt, EXPORT_HASHBITS); |
| 511 | |
| 512 | ch = sunrpc_cache_lookup(&svc_export_cache, &exp->h, |
| 513 | hash); |
| 514 | if (ch) |
| 515 | return container_of(ch, struct svc_export, h); |
| 516 | else |
| 517 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 518 | } |
| 519 | |
NeilBrown | 4f7774c | 2006-03-27 01:15:03 -0800 | [diff] [blame^] | 520 | struct svc_export * |
| 521 | svc_export_update(struct svc_export *new, struct svc_export *old) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 522 | { |
NeilBrown | 4f7774c | 2006-03-27 01:15:03 -0800 | [diff] [blame^] | 523 | struct cache_head *ch; |
| 524 | int hash; |
| 525 | hash = hash_ptr(old->ex_client, EXPORT_HASHBITS); |
| 526 | hash ^= hash_ptr(old->ex_dentry, EXPORT_HASHBITS); |
| 527 | hash ^= hash_ptr(old->ex_mnt, EXPORT_HASHBITS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 528 | |
NeilBrown | 4f7774c | 2006-03-27 01:15:03 -0800 | [diff] [blame^] | 529 | ch = sunrpc_cache_update(&svc_export_cache, &new->h, |
| 530 | &old->h, |
| 531 | hash); |
| 532 | if (ch) |
| 533 | return container_of(ch, struct svc_export, h); |
| 534 | else |
| 535 | return NULL; |
| 536 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 537 | |
| 538 | |
| 539 | struct svc_expkey * |
| 540 | exp_find_key(svc_client *clp, int fsid_type, u32 *fsidv, struct cache_req *reqp) |
| 541 | { |
| 542 | struct svc_expkey key, *ek; |
| 543 | int err; |
| 544 | |
| 545 | if (!clp) |
| 546 | return NULL; |
| 547 | |
| 548 | key.ek_client = clp; |
| 549 | key.ek_fsidtype = fsid_type; |
| 550 | memcpy(key.ek_fsid, fsidv, key_len(fsid_type)); |
| 551 | |
| 552 | ek = svc_expkey_lookup(&key, 0); |
| 553 | if (ek != NULL) |
| 554 | if ((err = cache_check(&svc_expkey_cache, &ek->h, reqp))) |
| 555 | ek = ERR_PTR(err); |
| 556 | return ek; |
| 557 | } |
| 558 | |
| 559 | static int exp_set_key(svc_client *clp, int fsid_type, u32 *fsidv, |
| 560 | struct svc_export *exp) |
| 561 | { |
| 562 | struct svc_expkey key, *ek; |
| 563 | |
| 564 | key.ek_client = clp; |
| 565 | key.ek_fsidtype = fsid_type; |
| 566 | memcpy(key.ek_fsid, fsidv, key_len(fsid_type)); |
NeilBrown | eab7e2e | 2006-03-27 01:15:00 -0800 | [diff] [blame] | 567 | key.ek_mnt = exp->ex_mnt; |
| 568 | key.ek_dentry = exp->ex_dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 569 | key.h.expiry_time = NEVER; |
| 570 | key.h.flags = 0; |
| 571 | |
| 572 | ek = svc_expkey_lookup(&key, 1); |
| 573 | if (ek) { |
| 574 | expkey_put(&ek->h, &svc_expkey_cache); |
| 575 | return 0; |
| 576 | } |
| 577 | return -ENOMEM; |
| 578 | } |
| 579 | |
| 580 | /* |
| 581 | * Find the client's export entry matching xdev/xino. |
| 582 | */ |
| 583 | static inline struct svc_expkey * |
| 584 | exp_get_key(svc_client *clp, dev_t dev, ino_t ino) |
| 585 | { |
| 586 | u32 fsidv[3]; |
| 587 | |
| 588 | if (old_valid_dev(dev)) { |
| 589 | mk_fsid_v0(fsidv, dev, ino); |
| 590 | return exp_find_key(clp, 0, fsidv, NULL); |
| 591 | } |
| 592 | mk_fsid_v3(fsidv, dev, ino); |
| 593 | return exp_find_key(clp, 3, fsidv, NULL); |
| 594 | } |
| 595 | |
| 596 | /* |
| 597 | * Find the client's export entry matching fsid |
| 598 | */ |
| 599 | static inline struct svc_expkey * |
| 600 | exp_get_fsid_key(svc_client *clp, int fsid) |
| 601 | { |
| 602 | u32 fsidv[2]; |
| 603 | |
| 604 | mk_fsid_v1(fsidv, fsid); |
| 605 | |
| 606 | return exp_find_key(clp, 1, fsidv, NULL); |
| 607 | } |
| 608 | |
| 609 | svc_export * |
| 610 | exp_get_by_name(svc_client *clp, struct vfsmount *mnt, struct dentry *dentry, |
| 611 | struct cache_req *reqp) |
| 612 | { |
| 613 | struct svc_export *exp, key; |
| 614 | |
| 615 | if (!clp) |
| 616 | return NULL; |
| 617 | |
| 618 | key.ex_client = clp; |
| 619 | key.ex_mnt = mnt; |
| 620 | key.ex_dentry = dentry; |
| 621 | |
NeilBrown | 4f7774c | 2006-03-27 01:15:03 -0800 | [diff] [blame^] | 622 | exp = svc_export_lookup(&key); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 623 | if (exp != NULL) |
| 624 | switch (cache_check(&svc_export_cache, &exp->h, reqp)) { |
| 625 | case 0: break; |
| 626 | case -EAGAIN: |
| 627 | exp = ERR_PTR(-EAGAIN); |
| 628 | break; |
| 629 | default: |
| 630 | exp = NULL; |
| 631 | } |
| 632 | |
| 633 | return exp; |
| 634 | } |
| 635 | |
| 636 | /* |
| 637 | * Find the export entry for a given dentry. |
| 638 | */ |
| 639 | struct svc_export * |
| 640 | exp_parent(svc_client *clp, struct vfsmount *mnt, struct dentry *dentry, |
| 641 | struct cache_req *reqp) |
| 642 | { |
| 643 | svc_export *exp; |
| 644 | |
| 645 | dget(dentry); |
| 646 | exp = exp_get_by_name(clp, mnt, dentry, reqp); |
| 647 | |
| 648 | while (exp == NULL && !IS_ROOT(dentry)) { |
| 649 | struct dentry *parent; |
| 650 | |
| 651 | parent = dget_parent(dentry); |
| 652 | dput(dentry); |
| 653 | dentry = parent; |
| 654 | exp = exp_get_by_name(clp, mnt, dentry, reqp); |
| 655 | } |
| 656 | dput(dentry); |
| 657 | return exp; |
| 658 | } |
| 659 | |
| 660 | /* |
| 661 | * Hashtable locking. Write locks are placed only by user processes |
| 662 | * wanting to modify export information. |
| 663 | * Write locking only done in this file. Read locking |
| 664 | * needed externally. |
| 665 | */ |
| 666 | |
| 667 | static DECLARE_RWSEM(hash_sem); |
| 668 | |
| 669 | void |
| 670 | exp_readlock(void) |
| 671 | { |
| 672 | down_read(&hash_sem); |
| 673 | } |
| 674 | |
| 675 | static inline void |
| 676 | exp_writelock(void) |
| 677 | { |
| 678 | down_write(&hash_sem); |
| 679 | } |
| 680 | |
| 681 | void |
| 682 | exp_readunlock(void) |
| 683 | { |
| 684 | up_read(&hash_sem); |
| 685 | } |
| 686 | |
| 687 | static inline void |
| 688 | exp_writeunlock(void) |
| 689 | { |
| 690 | up_write(&hash_sem); |
| 691 | } |
| 692 | |
| 693 | static void exp_fsid_unhash(struct svc_export *exp) |
| 694 | { |
| 695 | struct svc_expkey *ek; |
| 696 | |
| 697 | if ((exp->ex_flags & NFSEXP_FSID) == 0) |
| 698 | return; |
| 699 | |
| 700 | ek = exp_get_fsid_key(exp->ex_client, exp->ex_fsid); |
| 701 | if (ek && !IS_ERR(ek)) { |
| 702 | ek->h.expiry_time = get_seconds()-1; |
| 703 | expkey_put(&ek->h, &svc_expkey_cache); |
| 704 | } |
| 705 | svc_expkey_cache.nextcheck = get_seconds(); |
| 706 | } |
| 707 | |
| 708 | static int exp_fsid_hash(svc_client *clp, struct svc_export *exp) |
| 709 | { |
| 710 | u32 fsid[2]; |
| 711 | |
| 712 | if ((exp->ex_flags & NFSEXP_FSID) == 0) |
| 713 | return 0; |
| 714 | |
| 715 | mk_fsid_v1(fsid, exp->ex_fsid); |
| 716 | return exp_set_key(clp, 1, fsid, exp); |
| 717 | } |
| 718 | |
| 719 | static int exp_hash(struct auth_domain *clp, struct svc_export *exp) |
| 720 | { |
| 721 | u32 fsid[2]; |
| 722 | struct inode *inode = exp->ex_dentry->d_inode; |
| 723 | dev_t dev = inode->i_sb->s_dev; |
| 724 | |
| 725 | if (old_valid_dev(dev)) { |
| 726 | mk_fsid_v0(fsid, dev, inode->i_ino); |
| 727 | return exp_set_key(clp, 0, fsid, exp); |
| 728 | } |
| 729 | mk_fsid_v3(fsid, dev, inode->i_ino); |
| 730 | return exp_set_key(clp, 3, fsid, exp); |
| 731 | } |
| 732 | |
| 733 | static void exp_unhash(struct svc_export *exp) |
| 734 | { |
| 735 | struct svc_expkey *ek; |
| 736 | struct inode *inode = exp->ex_dentry->d_inode; |
| 737 | |
| 738 | ek = exp_get_key(exp->ex_client, inode->i_sb->s_dev, inode->i_ino); |
| 739 | if (ek && !IS_ERR(ek)) { |
| 740 | ek->h.expiry_time = get_seconds()-1; |
| 741 | expkey_put(&ek->h, &svc_expkey_cache); |
| 742 | } |
| 743 | svc_expkey_cache.nextcheck = get_seconds(); |
| 744 | } |
| 745 | |
| 746 | /* |
| 747 | * Export a file system. |
| 748 | */ |
| 749 | int |
| 750 | exp_export(struct nfsctl_export *nxp) |
| 751 | { |
| 752 | svc_client *clp; |
| 753 | struct svc_export *exp = NULL; |
| 754 | struct svc_export new; |
| 755 | struct svc_expkey *fsid_key = NULL; |
| 756 | struct nameidata nd; |
| 757 | int err; |
| 758 | |
| 759 | /* Consistency check */ |
| 760 | err = -EINVAL; |
| 761 | if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) || |
| 762 | !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX)) |
| 763 | goto out; |
| 764 | |
| 765 | dprintk("exp_export called for %s:%s (%x/%ld fl %x).\n", |
| 766 | nxp->ex_client, nxp->ex_path, |
| 767 | (unsigned)nxp->ex_dev, (long)nxp->ex_ino, |
| 768 | nxp->ex_flags); |
| 769 | |
| 770 | /* Try to lock the export table for update */ |
| 771 | exp_writelock(); |
| 772 | |
| 773 | /* Look up client info */ |
| 774 | if (!(clp = auth_domain_find(nxp->ex_client))) |
| 775 | goto out_unlock; |
| 776 | |
| 777 | |
| 778 | /* Look up the dentry */ |
| 779 | err = path_lookup(nxp->ex_path, 0, &nd); |
| 780 | if (err) |
| 781 | goto out_unlock; |
| 782 | err = -EINVAL; |
| 783 | |
| 784 | exp = exp_get_by_name(clp, nd.mnt, nd.dentry, NULL); |
| 785 | |
| 786 | /* must make sure there won't be an ex_fsid clash */ |
| 787 | if ((nxp->ex_flags & NFSEXP_FSID) && |
| 788 | (fsid_key = exp_get_fsid_key(clp, nxp->ex_dev)) && |
| 789 | !IS_ERR(fsid_key) && |
NeilBrown | eab7e2e | 2006-03-27 01:15:00 -0800 | [diff] [blame] | 790 | fsid_key->ek_mnt && |
| 791 | (fsid_key->ek_mnt != nd.mnt || fsid_key->ek_dentry != nd.dentry) ) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 792 | goto finish; |
| 793 | |
| 794 | if (exp) { |
| 795 | /* just a flags/id/fsid update */ |
| 796 | |
| 797 | exp_fsid_unhash(exp); |
| 798 | exp->ex_flags = nxp->ex_flags; |
| 799 | exp->ex_anon_uid = nxp->ex_anon_uid; |
| 800 | exp->ex_anon_gid = nxp->ex_anon_gid; |
| 801 | exp->ex_fsid = nxp->ex_dev; |
| 802 | |
| 803 | err = exp_fsid_hash(clp, exp); |
| 804 | goto finish; |
| 805 | } |
| 806 | |
| 807 | err = check_export(nd.dentry->d_inode, nxp->ex_flags); |
| 808 | if (err) goto finish; |
| 809 | |
| 810 | err = -ENOMEM; |
| 811 | |
| 812 | dprintk("nfsd: creating export entry %p for client %p\n", exp, clp); |
| 813 | |
| 814 | new.h.expiry_time = NEVER; |
| 815 | new.h.flags = 0; |
| 816 | new.ex_client = clp; |
| 817 | new.ex_mnt = nd.mnt; |
| 818 | new.ex_dentry = nd.dentry; |
| 819 | new.ex_flags = nxp->ex_flags; |
| 820 | new.ex_anon_uid = nxp->ex_anon_uid; |
| 821 | new.ex_anon_gid = nxp->ex_anon_gid; |
| 822 | new.ex_fsid = nxp->ex_dev; |
| 823 | |
NeilBrown | 4f7774c | 2006-03-27 01:15:03 -0800 | [diff] [blame^] | 824 | exp = svc_export_lookup(&new); |
| 825 | if (exp) |
| 826 | exp = svc_export_update(&new, exp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 827 | |
NeilBrown | 4f7774c | 2006-03-27 01:15:03 -0800 | [diff] [blame^] | 828 | if (!exp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 829 | goto finish; |
| 830 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 831 | if (exp_hash(clp, exp) || |
| 832 | exp_fsid_hash(clp, exp)) { |
| 833 | /* failed to create at least one index */ |
| 834 | exp_do_unexport(exp); |
| 835 | cache_flush(); |
| 836 | err = -ENOMEM; |
| 837 | } |
| 838 | |
| 839 | finish: |
| 840 | if (exp) |
| 841 | exp_put(exp); |
| 842 | if (fsid_key && !IS_ERR(fsid_key)) |
| 843 | expkey_put(&fsid_key->h, &svc_expkey_cache); |
| 844 | if (clp) |
| 845 | auth_domain_put(clp); |
| 846 | path_release(&nd); |
| 847 | out_unlock: |
| 848 | exp_writeunlock(); |
| 849 | out: |
| 850 | return err; |
| 851 | } |
| 852 | |
| 853 | /* |
| 854 | * Unexport a file system. The export entry has already |
| 855 | * been removed from the client's list of exported fs's. |
| 856 | */ |
| 857 | static void |
| 858 | exp_do_unexport(svc_export *unexp) |
| 859 | { |
| 860 | unexp->h.expiry_time = get_seconds()-1; |
| 861 | svc_export_cache.nextcheck = get_seconds(); |
| 862 | exp_unhash(unexp); |
| 863 | exp_fsid_unhash(unexp); |
| 864 | } |
| 865 | |
| 866 | |
| 867 | /* |
| 868 | * unexport syscall. |
| 869 | */ |
| 870 | int |
| 871 | exp_unexport(struct nfsctl_export *nxp) |
| 872 | { |
| 873 | struct auth_domain *dom; |
| 874 | svc_export *exp; |
| 875 | struct nameidata nd; |
| 876 | int err; |
| 877 | |
| 878 | /* Consistency check */ |
| 879 | if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) || |
| 880 | !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX)) |
| 881 | return -EINVAL; |
| 882 | |
| 883 | exp_writelock(); |
| 884 | |
| 885 | err = -EINVAL; |
| 886 | dom = auth_domain_find(nxp->ex_client); |
| 887 | if (!dom) { |
| 888 | dprintk("nfsd: unexport couldn't find %s\n", nxp->ex_client); |
| 889 | goto out_unlock; |
| 890 | } |
| 891 | |
| 892 | err = path_lookup(nxp->ex_path, 0, &nd); |
| 893 | if (err) |
| 894 | goto out_domain; |
| 895 | |
| 896 | err = -EINVAL; |
| 897 | exp = exp_get_by_name(dom, nd.mnt, nd.dentry, NULL); |
| 898 | path_release(&nd); |
| 899 | if (!exp) |
| 900 | goto out_domain; |
| 901 | |
| 902 | exp_do_unexport(exp); |
| 903 | exp_put(exp); |
| 904 | err = 0; |
| 905 | |
| 906 | out_domain: |
| 907 | auth_domain_put(dom); |
| 908 | cache_flush(); |
| 909 | out_unlock: |
| 910 | exp_writeunlock(); |
| 911 | return err; |
| 912 | } |
| 913 | |
| 914 | /* |
| 915 | * Obtain the root fh on behalf of a client. |
| 916 | * This could be done in user space, but I feel that it adds some safety |
| 917 | * since its harder to fool a kernel module than a user space program. |
| 918 | */ |
| 919 | int |
| 920 | exp_rootfh(svc_client *clp, char *path, struct knfsd_fh *f, int maxsize) |
| 921 | { |
| 922 | struct svc_export *exp; |
| 923 | struct nameidata nd; |
| 924 | struct inode *inode; |
| 925 | struct svc_fh fh; |
| 926 | int err; |
| 927 | |
| 928 | err = -EPERM; |
| 929 | /* NB: we probably ought to check that it's NUL-terminated */ |
| 930 | if (path_lookup(path, 0, &nd)) { |
| 931 | printk("nfsd: exp_rootfh path not found %s", path); |
| 932 | return err; |
| 933 | } |
| 934 | inode = nd.dentry->d_inode; |
| 935 | |
| 936 | dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n", |
| 937 | path, nd.dentry, clp->name, |
| 938 | inode->i_sb->s_id, inode->i_ino); |
| 939 | exp = exp_parent(clp, nd.mnt, nd.dentry, NULL); |
| 940 | if (!exp) { |
| 941 | dprintk("nfsd: exp_rootfh export not found.\n"); |
| 942 | goto out; |
| 943 | } |
| 944 | |
| 945 | /* |
| 946 | * fh must be initialized before calling fh_compose |
| 947 | */ |
| 948 | fh_init(&fh, maxsize); |
| 949 | if (fh_compose(&fh, exp, nd.dentry, NULL)) |
| 950 | err = -EINVAL; |
| 951 | else |
| 952 | err = 0; |
| 953 | memcpy(f, &fh.fh_handle, sizeof(struct knfsd_fh)); |
| 954 | fh_put(&fh); |
| 955 | exp_put(exp); |
| 956 | out: |
| 957 | path_release(&nd); |
| 958 | return err; |
| 959 | } |
| 960 | |
NeilBrown | eab7e2e | 2006-03-27 01:15:00 -0800 | [diff] [blame] | 961 | struct svc_export * |
| 962 | exp_find(struct auth_domain *clp, int fsid_type, u32 *fsidv, |
| 963 | struct cache_req *reqp) |
| 964 | { |
| 965 | struct svc_export *exp; |
| 966 | struct svc_expkey *ek = exp_find_key(clp, fsid_type, fsidv, reqp); |
| 967 | if (!ek || IS_ERR(ek)) |
| 968 | return ERR_PTR(PTR_ERR(ek)); |
| 969 | |
| 970 | exp = exp_get_by_name(clp, ek->ek_mnt, ek->ek_dentry, reqp); |
| 971 | expkey_put(&ek->h, &svc_expkey_cache); |
| 972 | |
| 973 | if (!exp || IS_ERR(exp)) |
| 974 | return ERR_PTR(PTR_ERR(exp)); |
| 975 | return exp; |
| 976 | } |
| 977 | |
| 978 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 979 | /* |
| 980 | * Called when we need the filehandle for the root of the pseudofs, |
| 981 | * for a given NFSv4 client. The root is defined to be the |
| 982 | * export point with fsid==0 |
| 983 | */ |
| 984 | int |
| 985 | exp_pseudoroot(struct auth_domain *clp, struct svc_fh *fhp, |
| 986 | struct cache_req *creq) |
| 987 | { |
| 988 | struct svc_expkey *fsid_key; |
NeilBrown | eab7e2e | 2006-03-27 01:15:00 -0800 | [diff] [blame] | 989 | struct svc_export *exp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 990 | int rv; |
| 991 | u32 fsidv[2]; |
| 992 | |
| 993 | mk_fsid_v1(fsidv, 0); |
| 994 | |
| 995 | fsid_key = exp_find_key(clp, 1, fsidv, creq); |
| 996 | if (IS_ERR(fsid_key) && PTR_ERR(fsid_key) == -EAGAIN) |
| 997 | return nfserr_dropit; |
| 998 | if (!fsid_key || IS_ERR(fsid_key)) |
| 999 | return nfserr_perm; |
| 1000 | |
NeilBrown | eab7e2e | 2006-03-27 01:15:00 -0800 | [diff] [blame] | 1001 | exp = exp_get_by_name(clp, fsid_key->ek_mnt, fsid_key->ek_dentry, creq); |
| 1002 | if (exp == NULL) |
| 1003 | rv = nfserr_perm; |
| 1004 | else if (IS_ERR(exp)) |
| 1005 | rv = nfserrno(PTR_ERR(exp)); |
| 1006 | else |
| 1007 | rv = fh_compose(fhp, exp, |
| 1008 | fsid_key->ek_dentry, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1009 | expkey_put(&fsid_key->h, &svc_expkey_cache); |
| 1010 | return rv; |
| 1011 | } |
| 1012 | |
| 1013 | /* Iterator */ |
| 1014 | |
| 1015 | static void *e_start(struct seq_file *m, loff_t *pos) |
| 1016 | { |
| 1017 | loff_t n = *pos; |
| 1018 | unsigned hash, export; |
| 1019 | struct cache_head *ch; |
| 1020 | |
| 1021 | exp_readlock(); |
| 1022 | read_lock(&svc_export_cache.hash_lock); |
| 1023 | if (!n--) |
| 1024 | return (void *)1; |
| 1025 | hash = n >> 32; |
| 1026 | export = n & ((1LL<<32) - 1); |
| 1027 | |
| 1028 | |
| 1029 | for (ch=export_table[hash]; ch; ch=ch->next) |
| 1030 | if (!export--) |
| 1031 | return ch; |
| 1032 | n &= ~((1LL<<32) - 1); |
| 1033 | do { |
| 1034 | hash++; |
| 1035 | n += 1LL<<32; |
| 1036 | } while(hash < EXPORT_HASHMAX && export_table[hash]==NULL); |
| 1037 | if (hash >= EXPORT_HASHMAX) |
| 1038 | return NULL; |
| 1039 | *pos = n+1; |
| 1040 | return export_table[hash]; |
| 1041 | } |
| 1042 | |
| 1043 | static void *e_next(struct seq_file *m, void *p, loff_t *pos) |
| 1044 | { |
| 1045 | struct cache_head *ch = p; |
| 1046 | int hash = (*pos >> 32); |
| 1047 | |
| 1048 | if (p == (void *)1) |
| 1049 | hash = 0; |
| 1050 | else if (ch->next == NULL) { |
| 1051 | hash++; |
| 1052 | *pos += 1LL<<32; |
| 1053 | } else { |
| 1054 | ++*pos; |
| 1055 | return ch->next; |
| 1056 | } |
| 1057 | *pos &= ~((1LL<<32) - 1); |
| 1058 | while (hash < EXPORT_HASHMAX && export_table[hash] == NULL) { |
| 1059 | hash++; |
| 1060 | *pos += 1LL<<32; |
| 1061 | } |
| 1062 | if (hash >= EXPORT_HASHMAX) |
| 1063 | return NULL; |
| 1064 | ++*pos; |
| 1065 | return export_table[hash]; |
| 1066 | } |
| 1067 | |
| 1068 | static void e_stop(struct seq_file *m, void *p) |
| 1069 | { |
| 1070 | read_unlock(&svc_export_cache.hash_lock); |
| 1071 | exp_readunlock(); |
| 1072 | } |
| 1073 | |
| 1074 | static struct flags { |
| 1075 | int flag; |
| 1076 | char *name[2]; |
| 1077 | } expflags[] = { |
| 1078 | { NFSEXP_READONLY, {"ro", "rw"}}, |
| 1079 | { NFSEXP_INSECURE_PORT, {"insecure", ""}}, |
| 1080 | { NFSEXP_ROOTSQUASH, {"root_squash", "no_root_squash"}}, |
| 1081 | { NFSEXP_ALLSQUASH, {"all_squash", ""}}, |
| 1082 | { NFSEXP_ASYNC, {"async", "sync"}}, |
| 1083 | { NFSEXP_GATHERED_WRITES, {"wdelay", "no_wdelay"}}, |
| 1084 | { NFSEXP_NOHIDE, {"nohide", ""}}, |
| 1085 | { NFSEXP_CROSSMOUNT, {"crossmnt", ""}}, |
| 1086 | { NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}}, |
| 1087 | { NFSEXP_NOAUTHNLM, {"insecure_locks", ""}}, |
| 1088 | #ifdef MSNFS |
| 1089 | { NFSEXP_MSNFS, {"msnfs", ""}}, |
| 1090 | #endif |
| 1091 | { 0, {"", ""}} |
| 1092 | }; |
| 1093 | |
| 1094 | static void exp_flags(struct seq_file *m, int flag, int fsid, uid_t anonu, uid_t anong) |
| 1095 | { |
| 1096 | int first = 0; |
| 1097 | struct flags *flg; |
| 1098 | |
| 1099 | for (flg = expflags; flg->flag; flg++) { |
| 1100 | int state = (flg->flag & flag)?0:1; |
| 1101 | if (*flg->name[state]) |
| 1102 | seq_printf(m, "%s%s", first++?",":"", flg->name[state]); |
| 1103 | } |
| 1104 | if (flag & NFSEXP_FSID) |
| 1105 | seq_printf(m, "%sfsid=%d", first++?",":"", fsid); |
| 1106 | if (anonu != (uid_t)-2 && anonu != (0x10000-2)) |
| 1107 | seq_printf(m, "%sanonuid=%d", first++?",":"", anonu); |
| 1108 | if (anong != (gid_t)-2 && anong != (0x10000-2)) |
| 1109 | seq_printf(m, "%sanongid=%d", first++?",":"", anong); |
| 1110 | } |
| 1111 | |
| 1112 | static int e_show(struct seq_file *m, void *p) |
| 1113 | { |
| 1114 | struct cache_head *cp = p; |
| 1115 | struct svc_export *exp = container_of(cp, struct svc_export, h); |
| 1116 | svc_client *clp; |
| 1117 | |
| 1118 | if (p == (void *)1) { |
| 1119 | seq_puts(m, "# Version 1.1\n"); |
| 1120 | seq_puts(m, "# Path Client(Flags) # IPs\n"); |
| 1121 | return 0; |
| 1122 | } |
| 1123 | |
| 1124 | clp = exp->ex_client; |
| 1125 | cache_get(&exp->h); |
| 1126 | if (cache_check(&svc_export_cache, &exp->h, NULL)) |
| 1127 | return 0; |
| 1128 | if (cache_put(&exp->h, &svc_export_cache)) BUG(); |
| 1129 | return svc_export_show(m, &svc_export_cache, cp); |
| 1130 | } |
| 1131 | |
| 1132 | struct seq_operations nfs_exports_op = { |
| 1133 | .start = e_start, |
| 1134 | .next = e_next, |
| 1135 | .stop = e_stop, |
| 1136 | .show = e_show, |
| 1137 | }; |
| 1138 | |
| 1139 | /* |
| 1140 | * Add or modify a client. |
| 1141 | * Change requests may involve the list of host addresses. The list of |
| 1142 | * exports and possibly existing uid maps are left untouched. |
| 1143 | */ |
| 1144 | int |
| 1145 | exp_addclient(struct nfsctl_client *ncp) |
| 1146 | { |
| 1147 | struct auth_domain *dom; |
| 1148 | int i, err; |
| 1149 | |
| 1150 | /* First, consistency check. */ |
| 1151 | err = -EINVAL; |
| 1152 | if (! exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX)) |
| 1153 | goto out; |
| 1154 | if (ncp->cl_naddr > NFSCLNT_ADDRMAX) |
| 1155 | goto out; |
| 1156 | |
| 1157 | /* Lock the hashtable */ |
| 1158 | exp_writelock(); |
| 1159 | |
| 1160 | dom = unix_domain_find(ncp->cl_ident); |
| 1161 | |
| 1162 | err = -ENOMEM; |
| 1163 | if (!dom) |
| 1164 | goto out_unlock; |
| 1165 | |
| 1166 | /* Insert client into hashtable. */ |
| 1167 | for (i = 0; i < ncp->cl_naddr; i++) |
| 1168 | auth_unix_add_addr(ncp->cl_addrlist[i], dom); |
| 1169 | |
| 1170 | auth_unix_forget_old(dom); |
| 1171 | auth_domain_put(dom); |
| 1172 | |
| 1173 | err = 0; |
| 1174 | |
| 1175 | out_unlock: |
| 1176 | exp_writeunlock(); |
| 1177 | out: |
| 1178 | return err; |
| 1179 | } |
| 1180 | |
| 1181 | /* |
| 1182 | * Delete a client given an identifier. |
| 1183 | */ |
| 1184 | int |
| 1185 | exp_delclient(struct nfsctl_client *ncp) |
| 1186 | { |
| 1187 | int err; |
| 1188 | struct auth_domain *dom; |
| 1189 | |
| 1190 | err = -EINVAL; |
| 1191 | if (!exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX)) |
| 1192 | goto out; |
| 1193 | |
| 1194 | /* Lock the hashtable */ |
| 1195 | exp_writelock(); |
| 1196 | |
| 1197 | dom = auth_domain_find(ncp->cl_ident); |
| 1198 | /* just make sure that no addresses work |
| 1199 | * and that it will expire soon |
| 1200 | */ |
| 1201 | if (dom) { |
| 1202 | err = auth_unix_forget_old(dom); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1203 | auth_domain_put(dom); |
| 1204 | } |
| 1205 | |
| 1206 | exp_writeunlock(); |
| 1207 | out: |
| 1208 | return err; |
| 1209 | } |
| 1210 | |
| 1211 | /* |
| 1212 | * Verify that string is non-empty and does not exceed max length. |
| 1213 | */ |
| 1214 | static int |
| 1215 | exp_verify_string(char *cp, int max) |
| 1216 | { |
| 1217 | int i; |
| 1218 | |
| 1219 | for (i = 0; i < max; i++) |
| 1220 | if (!cp[i]) |
| 1221 | return i; |
| 1222 | cp[i] = 0; |
| 1223 | printk(KERN_NOTICE "nfsd: couldn't validate string %s\n", cp); |
| 1224 | return 0; |
| 1225 | } |
| 1226 | |
| 1227 | /* |
| 1228 | * Initialize the exports module. |
| 1229 | */ |
| 1230 | void |
| 1231 | nfsd_export_init(void) |
| 1232 | { |
| 1233 | dprintk("nfsd: initializing export module.\n"); |
| 1234 | |
| 1235 | cache_register(&svc_export_cache); |
| 1236 | cache_register(&svc_expkey_cache); |
| 1237 | |
| 1238 | } |
| 1239 | |
| 1240 | /* |
| 1241 | * Flush exports table - called when last nfsd thread is killed |
| 1242 | */ |
| 1243 | void |
| 1244 | nfsd_export_flush(void) |
| 1245 | { |
| 1246 | exp_writelock(); |
| 1247 | cache_purge(&svc_expkey_cache); |
| 1248 | cache_purge(&svc_export_cache); |
| 1249 | exp_writeunlock(); |
| 1250 | } |
| 1251 | |
| 1252 | /* |
| 1253 | * Shutdown the exports module. |
| 1254 | */ |
| 1255 | void |
| 1256 | nfsd_export_shutdown(void) |
| 1257 | { |
| 1258 | |
| 1259 | dprintk("nfsd: shutting down export module.\n"); |
| 1260 | |
| 1261 | exp_writelock(); |
| 1262 | |
| 1263 | if (cache_unregister(&svc_expkey_cache)) |
| 1264 | printk(KERN_ERR "nfsd: failed to unregister expkey cache\n"); |
| 1265 | if (cache_unregister(&svc_export_cache)) |
| 1266 | printk(KERN_ERR "nfsd: failed to unregister export cache\n"); |
| 1267 | svcauth_unix_purge(); |
| 1268 | |
| 1269 | exp_writeunlock(); |
| 1270 | dprintk("nfsd: export shutdown complete.\n"); |
| 1271 | } |