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> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | #include <linux/stat.h> |
| 20 | #include <linux/in.h> |
| 21 | #include <linux/seq_file.h> |
| 22 | #include <linux/syscalls.h> |
| 23 | #include <linux/rwsem.h> |
| 24 | #include <linux/dcache.h> |
| 25 | #include <linux/namei.h> |
| 26 | #include <linux/mount.h> |
| 27 | #include <linux/hash.h> |
Bruce Allan | f35279d | 2005-09-06 15:17:08 -0700 | [diff] [blame] | 28 | #include <linux/module.h> |
Christoph Hellwig | a569425 | 2007-07-17 04:04:28 -0700 | [diff] [blame] | 29 | #include <linux/exportfs.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> |
Andy Adamson | e677bfe | 2007-07-17 04:04:42 -0700 | [diff] [blame] | 36 | #include <linux/sunrpc/msg_prot.h> |
| 37 | #include <linux/sunrpc/gss_api.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | |
| 39 | #define NFSDDBG_FACILITY NFSDDBG_EXPORT |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | |
| 41 | typedef struct auth_domain svc_client; |
| 42 | typedef struct svc_export svc_export; |
| 43 | |
| 44 | static void exp_do_unexport(svc_export *unexp); |
| 45 | static int exp_verify_string(char *cp, int max); |
| 46 | |
| 47 | /* |
| 48 | * We have two caches. |
| 49 | * One maps client+vfsmnt+dentry to export options - the export map |
| 50 | * The other maps client+filehandle-fragment to export options. - the expkey map |
| 51 | * |
| 52 | * The export options are actually stored in the first map, and the |
| 53 | * second map contains a reference to the entry in the first map. |
| 54 | */ |
| 55 | |
| 56 | #define EXPKEY_HASHBITS 8 |
| 57 | #define EXPKEY_HASHMAX (1 << EXPKEY_HASHBITS) |
| 58 | #define EXPKEY_HASHMASK (EXPKEY_HASHMAX -1) |
| 59 | static struct cache_head *expkey_table[EXPKEY_HASHMAX]; |
| 60 | |
Adrian Bunk | 74cae61 | 2006-03-27 01:15:10 -0800 | [diff] [blame] | 61 | static void expkey_put(struct kref *ref) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | { |
NeilBrown | baab935 | 2006-03-27 01:15:09 -0800 | [diff] [blame] | 63 | struct svc_expkey *key = container_of(ref, struct svc_expkey, h.ref); |
| 64 | |
| 65 | if (test_bit(CACHE_VALID, &key->h.flags) && |
| 66 | !test_bit(CACHE_NEGATIVE, &key->h.flags)) { |
| 67 | dput(key->ek_dentry); |
| 68 | mntput(key->ek_mnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | } |
NeilBrown | baab935 | 2006-03-27 01:15:09 -0800 | [diff] [blame] | 70 | auth_domain_put(key->ek_client); |
| 71 | kfree(key); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | } |
| 73 | |
| 74 | static void expkey_request(struct cache_detail *cd, |
| 75 | struct cache_head *h, |
| 76 | char **bpp, int *blen) |
| 77 | { |
| 78 | /* client fsidtype \xfsid */ |
| 79 | struct svc_expkey *ek = container_of(h, struct svc_expkey, h); |
| 80 | char type[5]; |
| 81 | |
| 82 | qword_add(bpp, blen, ek->ek_client->name); |
| 83 | snprintf(type, 5, "%d", ek->ek_fsidtype); |
| 84 | qword_add(bpp, blen, type); |
| 85 | qword_addhex(bpp, blen, (char*)ek->ek_fsid, key_len(ek->ek_fsidtype)); |
| 86 | (*bpp)[-1] = '\n'; |
| 87 | } |
| 88 | |
NeilBrown | 8d270f7f | 2006-03-27 01:15:04 -0800 | [diff] [blame] | 89 | static struct svc_expkey *svc_expkey_update(struct svc_expkey *new, struct svc_expkey *old); |
| 90 | static struct svc_expkey *svc_expkey_lookup(struct svc_expkey *); |
Adrian Bunk | 74cae61 | 2006-03-27 01:15:10 -0800 | [diff] [blame] | 91 | static struct cache_detail svc_expkey_cache; |
| 92 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | static int expkey_parse(struct cache_detail *cd, char *mesg, int mlen) |
| 94 | { |
| 95 | /* client fsidtype fsid [path] */ |
| 96 | char *buf; |
| 97 | int len; |
| 98 | struct auth_domain *dom = NULL; |
| 99 | int err; |
| 100 | int fsidtype; |
| 101 | char *ep; |
| 102 | struct svc_expkey key; |
NeilBrown | 8d270f7f | 2006-03-27 01:15:04 -0800 | [diff] [blame] | 103 | struct svc_expkey *ek; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | |
| 105 | if (mesg[mlen-1] != '\n') |
| 106 | return -EINVAL; |
| 107 | mesg[mlen-1] = 0; |
| 108 | |
| 109 | buf = kmalloc(PAGE_SIZE, GFP_KERNEL); |
| 110 | err = -ENOMEM; |
| 111 | if (!buf) goto out; |
| 112 | |
| 113 | err = -EINVAL; |
| 114 | if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0) |
| 115 | goto out; |
| 116 | |
| 117 | err = -ENOENT; |
| 118 | dom = auth_domain_find(buf); |
| 119 | if (!dom) |
| 120 | goto out; |
| 121 | dprintk("found domain %s\n", buf); |
| 122 | |
| 123 | err = -EINVAL; |
| 124 | if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0) |
| 125 | goto out; |
| 126 | fsidtype = simple_strtoul(buf, &ep, 10); |
| 127 | if (*ep) |
| 128 | goto out; |
| 129 | dprintk("found fsidtype %d\n", fsidtype); |
Frank Filz | 4bdff8c | 2006-06-30 01:56:11 -0700 | [diff] [blame] | 130 | if (key_len(fsidtype)==0) /* invalid type */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 131 | goto out; |
| 132 | if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0) |
| 133 | goto out; |
| 134 | dprintk("found fsid length %d\n", len); |
| 135 | if (len != key_len(fsidtype)) |
| 136 | goto out; |
| 137 | |
| 138 | /* OK, we seem to have a valid key */ |
| 139 | key.h.flags = 0; |
| 140 | key.h.expiry_time = get_expiry(&mesg); |
| 141 | if (key.h.expiry_time == 0) |
| 142 | goto out; |
| 143 | |
| 144 | key.ek_client = dom; |
| 145 | key.ek_fsidtype = fsidtype; |
| 146 | memcpy(key.ek_fsid, buf, len); |
| 147 | |
NeilBrown | 8d270f7f | 2006-03-27 01:15:04 -0800 | [diff] [blame] | 148 | ek = svc_expkey_lookup(&key); |
| 149 | err = -ENOMEM; |
| 150 | if (!ek) |
| 151 | goto out; |
| 152 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | /* now we want a pathname, or empty meaning NEGATIVE */ |
NeilBrown | 8d270f7f | 2006-03-27 01:15:04 -0800 | [diff] [blame] | 154 | err = -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | if ((len=qword_get(&mesg, buf, PAGE_SIZE)) < 0) |
| 156 | goto out; |
| 157 | dprintk("Path seems to be <%s>\n", buf); |
| 158 | err = 0; |
| 159 | if (len == 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 160 | set_bit(CACHE_NEGATIVE, &key.h.flags); |
NeilBrown | 8d270f7f | 2006-03-27 01:15:04 -0800 | [diff] [blame] | 161 | ek = svc_expkey_update(&key, ek); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 162 | if (ek) |
NeilBrown | baab935 | 2006-03-27 01:15:09 -0800 | [diff] [blame] | 163 | cache_put(&ek->h, &svc_expkey_cache); |
NeilBrown | 8d270f7f | 2006-03-27 01:15:04 -0800 | [diff] [blame] | 164 | else err = -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 165 | } else { |
| 166 | struct nameidata nd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 167 | err = path_lookup(buf, 0, &nd); |
| 168 | if (err) |
| 169 | goto out; |
| 170 | |
| 171 | dprintk("Found the path %s\n", buf); |
NeilBrown | eab7e2e | 2006-03-27 01:15:00 -0800 | [diff] [blame] | 172 | key.ek_mnt = nd.mnt; |
| 173 | key.ek_dentry = nd.dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 174 | |
NeilBrown | 8d270f7f | 2006-03-27 01:15:04 -0800 | [diff] [blame] | 175 | ek = svc_expkey_update(&key, ek); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | if (ek) |
NeilBrown | baab935 | 2006-03-27 01:15:09 -0800 | [diff] [blame] | 177 | cache_put(&ek->h, &svc_expkey_cache); |
NeilBrown | 8d270f7f | 2006-03-27 01:15:04 -0800 | [diff] [blame] | 178 | else |
| 179 | err = -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | path_release(&nd); |
| 181 | } |
| 182 | cache_flush(); |
| 183 | out: |
| 184 | if (dom) |
| 185 | auth_domain_put(dom); |
Jesper Juhl | f99d49a | 2005-11-07 01:01:34 -0800 | [diff] [blame] | 186 | kfree(buf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 187 | return err; |
| 188 | } |
| 189 | |
| 190 | static int expkey_show(struct seq_file *m, |
| 191 | struct cache_detail *cd, |
| 192 | struct cache_head *h) |
| 193 | { |
| 194 | struct svc_expkey *ek ; |
NeilBrown | af6a4e2 | 2007-02-14 00:33:12 -0800 | [diff] [blame] | 195 | int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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); |
NeilBrown | af6a4e2 | 2007-02-14 00:33:12 -0800 | [diff] [blame] | 202 | seq_printf(m, "%s %d 0x", ek->ek_client->name, |
| 203 | ek->ek_fsidtype); |
| 204 | for (i=0; i < key_len(ek->ek_fsidtype)/4; i++) |
| 205 | seq_printf(m, "%08x", ek->ek_fsid[i]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 206 | if (test_bit(CACHE_VALID, &h->flags) && |
| 207 | !test_bit(CACHE_NEGATIVE, &h->flags)) { |
| 208 | seq_printf(m, " "); |
NeilBrown | eab7e2e | 2006-03-27 01:15:00 -0800 | [diff] [blame] | 209 | seq_path(m, ek->ek_mnt, ek->ek_dentry, "\\ \t\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 210 | } |
| 211 | seq_printf(m, "\n"); |
| 212 | return 0; |
| 213 | } |
NeilBrown | 8d270f7f | 2006-03-27 01:15:04 -0800 | [diff] [blame] | 214 | |
| 215 | static inline int expkey_match (struct cache_head *a, struct cache_head *b) |
| 216 | { |
| 217 | struct svc_expkey *orig = container_of(a, struct svc_expkey, h); |
| 218 | struct svc_expkey *new = container_of(b, struct svc_expkey, h); |
| 219 | |
| 220 | if (orig->ek_fsidtype != new->ek_fsidtype || |
| 221 | orig->ek_client != new->ek_client || |
| 222 | memcmp(orig->ek_fsid, new->ek_fsid, key_len(orig->ek_fsidtype)) != 0) |
| 223 | return 0; |
| 224 | return 1; |
| 225 | } |
| 226 | |
| 227 | static inline void expkey_init(struct cache_head *cnew, |
| 228 | struct cache_head *citem) |
| 229 | { |
| 230 | struct svc_expkey *new = container_of(cnew, struct svc_expkey, h); |
| 231 | struct svc_expkey *item = container_of(citem, struct svc_expkey, h); |
| 232 | |
| 233 | kref_get(&item->ek_client->ref); |
| 234 | new->ek_client = item->ek_client; |
| 235 | new->ek_fsidtype = item->ek_fsidtype; |
NeilBrown | af6a4e2 | 2007-02-14 00:33:12 -0800 | [diff] [blame] | 236 | |
| 237 | memcpy(new->ek_fsid, item->ek_fsid, sizeof(new->ek_fsid)); |
NeilBrown | 8d270f7f | 2006-03-27 01:15:04 -0800 | [diff] [blame] | 238 | } |
| 239 | |
| 240 | static inline void expkey_update(struct cache_head *cnew, |
| 241 | struct cache_head *citem) |
| 242 | { |
| 243 | struct svc_expkey *new = container_of(cnew, struct svc_expkey, h); |
| 244 | struct svc_expkey *item = container_of(citem, struct svc_expkey, h); |
| 245 | |
| 246 | new->ek_mnt = mntget(item->ek_mnt); |
| 247 | new->ek_dentry = dget(item->ek_dentry); |
| 248 | } |
| 249 | |
| 250 | static struct cache_head *expkey_alloc(void) |
| 251 | { |
| 252 | struct svc_expkey *i = kmalloc(sizeof(*i), GFP_KERNEL); |
| 253 | if (i) |
| 254 | return &i->h; |
| 255 | else |
| 256 | return NULL; |
| 257 | } |
| 258 | |
Adrian Bunk | 74cae61 | 2006-03-27 01:15:10 -0800 | [diff] [blame] | 259 | static struct cache_detail svc_expkey_cache = { |
Bruce Allan | f35279d | 2005-09-06 15:17:08 -0700 | [diff] [blame] | 260 | .owner = THIS_MODULE, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 261 | .hash_size = EXPKEY_HASHMAX, |
| 262 | .hash_table = expkey_table, |
| 263 | .name = "nfsd.fh", |
| 264 | .cache_put = expkey_put, |
| 265 | .cache_request = expkey_request, |
| 266 | .cache_parse = expkey_parse, |
| 267 | .cache_show = expkey_show, |
NeilBrown | 8d270f7f | 2006-03-27 01:15:04 -0800 | [diff] [blame] | 268 | .match = expkey_match, |
| 269 | .init = expkey_init, |
| 270 | .update = expkey_update, |
| 271 | .alloc = expkey_alloc, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 272 | }; |
| 273 | |
NeilBrown | 8d270f7f | 2006-03-27 01:15:04 -0800 | [diff] [blame] | 274 | static struct svc_expkey * |
| 275 | svc_expkey_lookup(struct svc_expkey *item) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 276 | { |
NeilBrown | 8d270f7f | 2006-03-27 01:15:04 -0800 | [diff] [blame] | 277 | struct cache_head *ch; |
| 278 | int hash = item->ek_fsidtype; |
| 279 | char * cp = (char*)item->ek_fsid; |
| 280 | int len = key_len(item->ek_fsidtype); |
| 281 | |
| 282 | hash ^= hash_mem(cp, len, EXPKEY_HASHBITS); |
| 283 | hash ^= hash_ptr(item->ek_client, EXPKEY_HASHBITS); |
| 284 | hash &= EXPKEY_HASHMASK; |
| 285 | |
| 286 | ch = sunrpc_cache_lookup(&svc_expkey_cache, &item->h, |
| 287 | hash); |
| 288 | if (ch) |
| 289 | return container_of(ch, struct svc_expkey, h); |
| 290 | else |
| 291 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 292 | } |
| 293 | |
NeilBrown | 8d270f7f | 2006-03-27 01:15:04 -0800 | [diff] [blame] | 294 | static struct svc_expkey * |
| 295 | svc_expkey_update(struct svc_expkey *new, struct svc_expkey *old) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 296 | { |
NeilBrown | 8d270f7f | 2006-03-27 01:15:04 -0800 | [diff] [blame] | 297 | struct cache_head *ch; |
| 298 | int hash = new->ek_fsidtype; |
| 299 | char * cp = (char*)new->ek_fsid; |
| 300 | int len = key_len(new->ek_fsidtype); |
| 301 | |
| 302 | hash ^= hash_mem(cp, len, EXPKEY_HASHBITS); |
| 303 | hash ^= hash_ptr(new->ek_client, EXPKEY_HASHBITS); |
| 304 | hash &= EXPKEY_HASHMASK; |
| 305 | |
| 306 | ch = sunrpc_cache_update(&svc_expkey_cache, &new->h, |
| 307 | &old->h, hash); |
| 308 | if (ch) |
| 309 | return container_of(ch, struct svc_expkey, h); |
| 310 | else |
| 311 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | } |
| 313 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 314 | |
| 315 | #define EXPORT_HASHBITS 8 |
| 316 | #define EXPORT_HASHMAX (1<< EXPORT_HASHBITS) |
| 317 | #define EXPORT_HASHMASK (EXPORT_HASHMAX -1) |
| 318 | |
| 319 | static struct cache_head *export_table[EXPORT_HASHMAX]; |
| 320 | |
Manoj Naik | 93346919 | 2006-10-04 02:16:18 -0700 | [diff] [blame] | 321 | static void nfsd4_fslocs_free(struct nfsd4_fs_locations *fsloc) |
| 322 | { |
| 323 | int i; |
| 324 | |
| 325 | for (i = 0; i < fsloc->locations_count; i++) { |
| 326 | kfree(fsloc->locations[i].path); |
| 327 | kfree(fsloc->locations[i].hosts); |
| 328 | } |
| 329 | kfree(fsloc->locations); |
| 330 | } |
| 331 | |
NeilBrown | baab935 | 2006-03-27 01:15:09 -0800 | [diff] [blame] | 332 | static void svc_export_put(struct kref *ref) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 333 | { |
NeilBrown | baab935 | 2006-03-27 01:15:09 -0800 | [diff] [blame] | 334 | struct svc_export *exp = container_of(ref, struct svc_export, h.ref); |
| 335 | dput(exp->ex_dentry); |
| 336 | mntput(exp->ex_mnt); |
| 337 | auth_domain_put(exp->ex_client); |
J.Bruce Fields | b009a87 | 2006-10-04 02:16:17 -0700 | [diff] [blame] | 338 | kfree(exp->ex_path); |
Manoj Naik | 93346919 | 2006-10-04 02:16:18 -0700 | [diff] [blame] | 339 | nfsd4_fslocs_free(&exp->ex_fslocs); |
NeilBrown | baab935 | 2006-03-27 01:15:09 -0800 | [diff] [blame] | 340 | kfree(exp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 341 | } |
| 342 | |
| 343 | static void svc_export_request(struct cache_detail *cd, |
| 344 | struct cache_head *h, |
| 345 | char **bpp, int *blen) |
| 346 | { |
| 347 | /* client path */ |
| 348 | struct svc_export *exp = container_of(h, struct svc_export, h); |
| 349 | char *pth; |
| 350 | |
| 351 | qword_add(bpp, blen, exp->ex_client->name); |
| 352 | pth = d_path(exp->ex_dentry, exp->ex_mnt, *bpp, *blen); |
| 353 | if (IS_ERR(pth)) { |
| 354 | /* is this correct? */ |
| 355 | (*bpp)[0] = '\n'; |
| 356 | return; |
| 357 | } |
| 358 | qword_add(bpp, blen, pth); |
| 359 | (*bpp)[-1] = '\n'; |
| 360 | } |
| 361 | |
Adrian Bunk | 74cae61 | 2006-03-27 01:15:10 -0800 | [diff] [blame] | 362 | static struct svc_export *svc_export_update(struct svc_export *new, |
| 363 | struct svc_export *old); |
NeilBrown | 4f7774c | 2006-03-27 01:15:03 -0800 | [diff] [blame] | 364 | static struct svc_export *svc_export_lookup(struct svc_export *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 365 | |
NeilBrown | af6a4e2 | 2007-02-14 00:33:12 -0800 | [diff] [blame] | 366 | static int check_export(struct inode *inode, int flags, unsigned char *uuid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 367 | { |
| 368 | |
| 369 | /* We currently export only dirs and regular files. |
| 370 | * This is what umountd does. |
| 371 | */ |
| 372 | if (!S_ISDIR(inode->i_mode) && |
| 373 | !S_ISREG(inode->i_mode)) |
| 374 | return -ENOTDIR; |
| 375 | |
| 376 | /* There are two requirements on a filesystem to be exportable. |
| 377 | * 1: We must be able to identify the filesystem from a number. |
| 378 | * either a device number (so FS_REQUIRES_DEV needed) |
NeilBrown | af6a4e2 | 2007-02-14 00:33:12 -0800 | [diff] [blame] | 379 | * or an FSID number (so NFSEXP_FSID or ->uuid is needed). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 380 | * 2: We must be able to find an inode from a filehandle. |
| 381 | * This means that s_export_op must be set. |
| 382 | */ |
| 383 | if (!(inode->i_sb->s_type->fs_flags & FS_REQUIRES_DEV) && |
NeilBrown | af6a4e2 | 2007-02-14 00:33:12 -0800 | [diff] [blame] | 384 | !(flags & NFSEXP_FSID) && |
| 385 | uuid == NULL) { |
Greg Banks | 3e3b480 | 2006-10-02 02:17:41 -0700 | [diff] [blame] | 386 | dprintk("exp_export: export of non-dev fs without fsid\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 387 | return -EINVAL; |
| 388 | } |
| 389 | if (!inode->i_sb->s_export_op) { |
| 390 | dprintk("exp_export: export of invalid fs type.\n"); |
| 391 | return -EINVAL; |
| 392 | } |
| 393 | |
| 394 | /* Ok, we can export it */; |
| 395 | if (!inode->i_sb->s_export_op->find_exported_dentry) |
| 396 | inode->i_sb->s_export_op->find_exported_dentry = |
| 397 | find_exported_dentry; |
| 398 | return 0; |
| 399 | |
| 400 | } |
| 401 | |
Manoj Naik | 93346919 | 2006-10-04 02:16:18 -0700 | [diff] [blame] | 402 | #ifdef CONFIG_NFSD_V4 |
| 403 | |
| 404 | static int |
| 405 | fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc) |
| 406 | { |
| 407 | int len; |
| 408 | int migrated, i, err; |
| 409 | |
Manoj Naik | 93346919 | 2006-10-04 02:16:18 -0700 | [diff] [blame] | 410 | /* listsize */ |
| 411 | err = get_int(mesg, &fsloc->locations_count); |
| 412 | if (err) |
| 413 | return err; |
| 414 | if (fsloc->locations_count > MAX_FS_LOCATIONS) |
| 415 | return -EINVAL; |
| 416 | if (fsloc->locations_count == 0) |
| 417 | return 0; |
| 418 | |
| 419 | fsloc->locations = kzalloc(fsloc->locations_count |
| 420 | * sizeof(struct nfsd4_fs_location), GFP_KERNEL); |
| 421 | if (!fsloc->locations) |
| 422 | return -ENOMEM; |
| 423 | for (i=0; i < fsloc->locations_count; i++) { |
| 424 | /* colon separated host list */ |
| 425 | err = -EINVAL; |
| 426 | len = qword_get(mesg, buf, PAGE_SIZE); |
| 427 | if (len <= 0) |
| 428 | goto out_free_all; |
| 429 | err = -ENOMEM; |
| 430 | fsloc->locations[i].hosts = kstrdup(buf, GFP_KERNEL); |
| 431 | if (!fsloc->locations[i].hosts) |
| 432 | goto out_free_all; |
| 433 | err = -EINVAL; |
| 434 | /* slash separated path component list */ |
| 435 | len = qword_get(mesg, buf, PAGE_SIZE); |
| 436 | if (len <= 0) |
| 437 | goto out_free_all; |
| 438 | err = -ENOMEM; |
| 439 | fsloc->locations[i].path = kstrdup(buf, GFP_KERNEL); |
| 440 | if (!fsloc->locations[i].path) |
| 441 | goto out_free_all; |
| 442 | } |
| 443 | /* migrated */ |
| 444 | err = get_int(mesg, &migrated); |
| 445 | if (err) |
| 446 | goto out_free_all; |
| 447 | err = -EINVAL; |
| 448 | if (migrated < 0 || migrated > 1) |
| 449 | goto out_free_all; |
| 450 | fsloc->migrated = migrated; |
| 451 | return 0; |
| 452 | out_free_all: |
| 453 | nfsd4_fslocs_free(fsloc); |
| 454 | return err; |
| 455 | } |
| 456 | |
Andy Adamson | e677bfe | 2007-07-17 04:04:42 -0700 | [diff] [blame] | 457 | static int secinfo_parse(char **mesg, char *buf, struct svc_export *exp) |
| 458 | { |
| 459 | int listsize, err; |
| 460 | struct exp_flavor_info *f; |
| 461 | |
| 462 | err = get_int(mesg, &listsize); |
| 463 | if (err) |
| 464 | return err; |
| 465 | if (listsize < 0 || listsize > MAX_SECINFO_LIST) |
| 466 | return -EINVAL; |
| 467 | |
| 468 | for (f = exp->ex_flavors; f < exp->ex_flavors + listsize; f++) { |
| 469 | err = get_int(mesg, &f->pseudoflavor); |
| 470 | if (err) |
| 471 | return err; |
| 472 | /* |
| 473 | * Just a quick sanity check; we could also try to check |
| 474 | * whether this pseudoflavor is supported, but at worst |
| 475 | * an unsupported pseudoflavor on the export would just |
| 476 | * be a pseudoflavor that won't match the flavor of any |
| 477 | * authenticated request. The administrator will |
| 478 | * probably discover the problem when someone fails to |
| 479 | * authenticate. |
| 480 | */ |
| 481 | if (f->pseudoflavor < 0) |
| 482 | return -EINVAL; |
| 483 | err = get_int(mesg, &f->flags); |
| 484 | if (err) |
| 485 | return err; |
| 486 | /* Only some flags are allowed to differ between flavors: */ |
| 487 | if (~NFSEXP_SECINFO_FLAGS & (f->flags ^ exp->ex_flags)) |
| 488 | return -EINVAL; |
| 489 | } |
| 490 | exp->ex_nflavors = listsize; |
| 491 | return 0; |
| 492 | } |
| 493 | |
Manoj Naik | 93346919 | 2006-10-04 02:16:18 -0700 | [diff] [blame] | 494 | #else /* CONFIG_NFSD_V4 */ |
Andy Adamson | e677bfe | 2007-07-17 04:04:42 -0700 | [diff] [blame] | 495 | static inline int |
| 496 | fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc){return 0;} |
| 497 | static inline int |
| 498 | secinfo_parse(char **mesg, char *buf, struct svc_export *exp) { return 0; } |
Manoj Naik | 93346919 | 2006-10-04 02:16:18 -0700 | [diff] [blame] | 499 | #endif |
| 500 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 501 | static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen) |
| 502 | { |
| 503 | /* client path expiry [flags anonuid anongid fsid] */ |
| 504 | char *buf; |
| 505 | int len; |
| 506 | int err; |
| 507 | struct auth_domain *dom = NULL; |
| 508 | struct nameidata nd; |
| 509 | struct svc_export exp, *expp; |
| 510 | int an_int; |
| 511 | |
| 512 | nd.dentry = NULL; |
J.Bruce Fields | b009a87 | 2006-10-04 02:16:17 -0700 | [diff] [blame] | 513 | exp.ex_path = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 514 | |
NeilBrown | 402acd2 | 2007-05-09 02:34:52 -0700 | [diff] [blame] | 515 | /* fs locations */ |
| 516 | exp.ex_fslocs.locations = NULL; |
| 517 | exp.ex_fslocs.locations_count = 0; |
| 518 | exp.ex_fslocs.migrated = 0; |
| 519 | |
| 520 | exp.ex_uuid = NULL; |
| 521 | |
Andy Adamson | e677bfe | 2007-07-17 04:04:42 -0700 | [diff] [blame] | 522 | /* secinfo */ |
| 523 | exp.ex_nflavors = 0; |
| 524 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 525 | if (mesg[mlen-1] != '\n') |
| 526 | return -EINVAL; |
| 527 | mesg[mlen-1] = 0; |
| 528 | |
| 529 | buf = kmalloc(PAGE_SIZE, GFP_KERNEL); |
| 530 | err = -ENOMEM; |
| 531 | if (!buf) goto out; |
| 532 | |
| 533 | /* client */ |
| 534 | len = qword_get(&mesg, buf, PAGE_SIZE); |
| 535 | err = -EINVAL; |
| 536 | if (len <= 0) goto out; |
| 537 | |
| 538 | err = -ENOENT; |
| 539 | dom = auth_domain_find(buf); |
| 540 | if (!dom) |
| 541 | goto out; |
| 542 | |
| 543 | /* path */ |
| 544 | err = -EINVAL; |
| 545 | if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0) |
| 546 | goto out; |
| 547 | err = path_lookup(buf, 0, &nd); |
NeilBrown | cd15654 | 2006-04-10 22:55:27 -0700 | [diff] [blame] | 548 | if (err) goto out_no_path; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 549 | |
| 550 | exp.h.flags = 0; |
| 551 | exp.ex_client = dom; |
| 552 | exp.ex_mnt = nd.mnt; |
| 553 | exp.ex_dentry = nd.dentry; |
J.Bruce Fields | b009a87 | 2006-10-04 02:16:17 -0700 | [diff] [blame] | 554 | exp.ex_path = kstrdup(buf, GFP_KERNEL); |
| 555 | err = -ENOMEM; |
| 556 | if (!exp.ex_path) |
| 557 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 558 | |
| 559 | /* expiry */ |
| 560 | err = -EINVAL; |
| 561 | exp.h.expiry_time = get_expiry(&mesg); |
| 562 | if (exp.h.expiry_time == 0) |
| 563 | goto out; |
| 564 | |
| 565 | /* flags */ |
| 566 | err = get_int(&mesg, &an_int); |
J. Bruce Fields | 4a4b883 | 2007-07-31 00:37:53 -0700 | [diff] [blame] | 567 | if (err == -ENOENT) { |
| 568 | err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 569 | set_bit(CACHE_NEGATIVE, &exp.h.flags); |
J. Bruce Fields | 4a4b883 | 2007-07-31 00:37:53 -0700 | [diff] [blame] | 570 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 571 | if (err || an_int < 0) goto out; |
| 572 | exp.ex_flags= an_int; |
| 573 | |
| 574 | /* anon uid */ |
| 575 | err = get_int(&mesg, &an_int); |
| 576 | if (err) goto out; |
| 577 | exp.ex_anon_uid= an_int; |
| 578 | |
| 579 | /* anon gid */ |
| 580 | err = get_int(&mesg, &an_int); |
| 581 | if (err) goto out; |
| 582 | exp.ex_anon_gid= an_int; |
| 583 | |
| 584 | /* fsid */ |
| 585 | err = get_int(&mesg, &an_int); |
| 586 | if (err) goto out; |
| 587 | exp.ex_fsid = an_int; |
| 588 | |
NeilBrown | af6a4e2 | 2007-02-14 00:33:12 -0800 | [diff] [blame] | 589 | while ((len = qword_get(&mesg, buf, PAGE_SIZE)) > 0) { |
| 590 | if (strcmp(buf, "fsloc") == 0) |
| 591 | err = fsloc_parse(&mesg, buf, &exp.ex_fslocs); |
| 592 | else if (strcmp(buf, "uuid") == 0) { |
| 593 | /* expect a 16 byte uuid encoded as \xXXXX... */ |
| 594 | len = qword_get(&mesg, buf, PAGE_SIZE); |
| 595 | if (len != 16) |
| 596 | err = -EINVAL; |
| 597 | else { |
| 598 | exp.ex_uuid = |
| 599 | kmemdup(buf, 16, GFP_KERNEL); |
| 600 | if (exp.ex_uuid == NULL) |
| 601 | err = -ENOMEM; |
| 602 | } |
Andy Adamson | e677bfe | 2007-07-17 04:04:42 -0700 | [diff] [blame] | 603 | } else if (strcmp(buf, "secinfo") == 0) |
| 604 | err = secinfo_parse(&mesg, buf, &exp); |
| 605 | else |
NeilBrown | af6a4e2 | 2007-02-14 00:33:12 -0800 | [diff] [blame] | 606 | /* quietly ignore unknown words and anything |
| 607 | * following. Newer user-space can try to set |
| 608 | * new values, then see what the result was. |
| 609 | */ |
| 610 | break; |
| 611 | if (err) |
| 612 | goto out; |
| 613 | } |
Manoj Naik | 93346919 | 2006-10-04 02:16:18 -0700 | [diff] [blame] | 614 | |
NeilBrown | af6a4e2 | 2007-02-14 00:33:12 -0800 | [diff] [blame] | 615 | err = check_export(nd.dentry->d_inode, exp.ex_flags, |
| 616 | exp.ex_uuid); |
| 617 | if (err) goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 618 | } |
| 619 | |
NeilBrown | 4f7774c | 2006-03-27 01:15:03 -0800 | [diff] [blame] | 620 | expp = svc_export_lookup(&exp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 621 | if (expp) |
NeilBrown | 4f7774c | 2006-03-27 01:15:03 -0800 | [diff] [blame] | 622 | expp = svc_export_update(&exp, expp); |
| 623 | else |
| 624 | err = -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 625 | cache_flush(); |
NeilBrown | 4f7774c | 2006-03-27 01:15:03 -0800 | [diff] [blame] | 626 | if (expp == NULL) |
| 627 | err = -ENOMEM; |
| 628 | else |
| 629 | exp_put(expp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 630 | out: |
NeilBrown | af6a4e2 | 2007-02-14 00:33:12 -0800 | [diff] [blame] | 631 | nfsd4_fslocs_free(&exp.ex_fslocs); |
| 632 | kfree(exp.ex_uuid); |
J.Bruce Fields | b009a87 | 2006-10-04 02:16:17 -0700 | [diff] [blame] | 633 | kfree(exp.ex_path); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 634 | if (nd.dentry) |
| 635 | path_release(&nd); |
NeilBrown | cd15654 | 2006-04-10 22:55:27 -0700 | [diff] [blame] | 636 | out_no_path: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 637 | if (dom) |
| 638 | auth_domain_put(dom); |
Jesper Juhl | f99d49a | 2005-11-07 01:01:34 -0800 | [diff] [blame] | 639 | kfree(buf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 640 | return err; |
| 641 | } |
| 642 | |
Manoj Naik | 93346919 | 2006-10-04 02:16:18 -0700 | [diff] [blame] | 643 | static void exp_flags(struct seq_file *m, int flag, int fsid, |
| 644 | uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fslocs); |
J. Bruce Fields | 91fe39d | 2007-07-17 04:04:49 -0700 | [diff] [blame] | 645 | static void show_secinfo(struct seq_file *m, struct svc_export *exp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 646 | |
| 647 | static int svc_export_show(struct seq_file *m, |
| 648 | struct cache_detail *cd, |
| 649 | struct cache_head *h) |
| 650 | { |
| 651 | struct svc_export *exp ; |
| 652 | |
| 653 | if (h ==NULL) { |
| 654 | seq_puts(m, "#path domain(flags)\n"); |
| 655 | return 0; |
| 656 | } |
| 657 | exp = container_of(h, struct svc_export, h); |
| 658 | seq_path(m, exp->ex_mnt, exp->ex_dentry, " \t\n\\"); |
| 659 | seq_putc(m, '\t'); |
| 660 | seq_escape(m, exp->ex_client->name, " \t\n\\"); |
| 661 | seq_putc(m, '('); |
| 662 | if (test_bit(CACHE_VALID, &h->flags) && |
NeilBrown | af6a4e2 | 2007-02-14 00:33:12 -0800 | [diff] [blame] | 663 | !test_bit(CACHE_NEGATIVE, &h->flags)) { |
Manoj Naik | 93346919 | 2006-10-04 02:16:18 -0700 | [diff] [blame] | 664 | exp_flags(m, exp->ex_flags, exp->ex_fsid, |
| 665 | exp->ex_anon_uid, exp->ex_anon_gid, &exp->ex_fslocs); |
NeilBrown | af6a4e2 | 2007-02-14 00:33:12 -0800 | [diff] [blame] | 666 | if (exp->ex_uuid) { |
| 667 | int i; |
| 668 | seq_puts(m, ",uuid="); |
| 669 | for (i=0; i<16; i++) { |
| 670 | if ((i&3) == 0 && i) |
| 671 | seq_putc(m, ':'); |
| 672 | seq_printf(m, "%02x", exp->ex_uuid[i]); |
| 673 | } |
| 674 | } |
J. Bruce Fields | 91fe39d | 2007-07-17 04:04:49 -0700 | [diff] [blame] | 675 | show_secinfo(m, exp); |
NeilBrown | af6a4e2 | 2007-02-14 00:33:12 -0800 | [diff] [blame] | 676 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 677 | seq_puts(m, ")\n"); |
| 678 | return 0; |
| 679 | } |
NeilBrown | 4f7774c | 2006-03-27 01:15:03 -0800 | [diff] [blame] | 680 | static int svc_export_match(struct cache_head *a, struct cache_head *b) |
| 681 | { |
| 682 | struct svc_export *orig = container_of(a, struct svc_export, h); |
| 683 | struct svc_export *new = container_of(b, struct svc_export, h); |
| 684 | return orig->ex_client == new->ex_client && |
| 685 | orig->ex_dentry == new->ex_dentry && |
| 686 | orig->ex_mnt == new->ex_mnt; |
| 687 | } |
| 688 | |
| 689 | static void svc_export_init(struct cache_head *cnew, struct cache_head *citem) |
| 690 | { |
| 691 | struct svc_export *new = container_of(cnew, struct svc_export, h); |
| 692 | struct svc_export *item = container_of(citem, struct svc_export, h); |
| 693 | |
| 694 | kref_get(&item->ex_client->ref); |
| 695 | new->ex_client = item->ex_client; |
| 696 | new->ex_dentry = dget(item->ex_dentry); |
| 697 | new->ex_mnt = mntget(item->ex_mnt); |
J.Bruce Fields | b009a87 | 2006-10-04 02:16:17 -0700 | [diff] [blame] | 698 | new->ex_path = NULL; |
Manoj Naik | 93346919 | 2006-10-04 02:16:18 -0700 | [diff] [blame] | 699 | new->ex_fslocs.locations = NULL; |
| 700 | new->ex_fslocs.locations_count = 0; |
| 701 | new->ex_fslocs.migrated = 0; |
NeilBrown | 4f7774c | 2006-03-27 01:15:03 -0800 | [diff] [blame] | 702 | } |
| 703 | |
| 704 | static void export_update(struct cache_head *cnew, struct cache_head *citem) |
| 705 | { |
| 706 | struct svc_export *new = container_of(cnew, struct svc_export, h); |
| 707 | struct svc_export *item = container_of(citem, struct svc_export, h); |
Andy Adamson | e677bfe | 2007-07-17 04:04:42 -0700 | [diff] [blame] | 708 | int i; |
NeilBrown | 4f7774c | 2006-03-27 01:15:03 -0800 | [diff] [blame] | 709 | |
| 710 | new->ex_flags = item->ex_flags; |
| 711 | new->ex_anon_uid = item->ex_anon_uid; |
| 712 | new->ex_anon_gid = item->ex_anon_gid; |
| 713 | new->ex_fsid = item->ex_fsid; |
NeilBrown | af6a4e2 | 2007-02-14 00:33:12 -0800 | [diff] [blame] | 714 | new->ex_uuid = item->ex_uuid; |
| 715 | item->ex_uuid = NULL; |
J.Bruce Fields | b009a87 | 2006-10-04 02:16:17 -0700 | [diff] [blame] | 716 | new->ex_path = item->ex_path; |
| 717 | item->ex_path = NULL; |
Manoj Naik | 93346919 | 2006-10-04 02:16:18 -0700 | [diff] [blame] | 718 | new->ex_fslocs.locations = item->ex_fslocs.locations; |
| 719 | item->ex_fslocs.locations = NULL; |
| 720 | new->ex_fslocs.locations_count = item->ex_fslocs.locations_count; |
| 721 | item->ex_fslocs.locations_count = 0; |
| 722 | new->ex_fslocs.migrated = item->ex_fslocs.migrated; |
| 723 | item->ex_fslocs.migrated = 0; |
Andy Adamson | e677bfe | 2007-07-17 04:04:42 -0700 | [diff] [blame] | 724 | new->ex_nflavors = item->ex_nflavors; |
| 725 | for (i = 0; i < MAX_SECINFO_LIST; i++) { |
| 726 | new->ex_flavors[i] = item->ex_flavors[i]; |
| 727 | } |
NeilBrown | 4f7774c | 2006-03-27 01:15:03 -0800 | [diff] [blame] | 728 | } |
| 729 | |
| 730 | static struct cache_head *svc_export_alloc(void) |
| 731 | { |
| 732 | struct svc_export *i = kmalloc(sizeof(*i), GFP_KERNEL); |
| 733 | if (i) |
| 734 | return &i->h; |
| 735 | else |
| 736 | return NULL; |
| 737 | } |
| 738 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 739 | struct cache_detail svc_export_cache = { |
Bruce Allan | f35279d | 2005-09-06 15:17:08 -0700 | [diff] [blame] | 740 | .owner = THIS_MODULE, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 741 | .hash_size = EXPORT_HASHMAX, |
| 742 | .hash_table = export_table, |
| 743 | .name = "nfsd.export", |
| 744 | .cache_put = svc_export_put, |
| 745 | .cache_request = svc_export_request, |
| 746 | .cache_parse = svc_export_parse, |
| 747 | .cache_show = svc_export_show, |
NeilBrown | 4f7774c | 2006-03-27 01:15:03 -0800 | [diff] [blame] | 748 | .match = svc_export_match, |
| 749 | .init = svc_export_init, |
| 750 | .update = export_update, |
| 751 | .alloc = svc_export_alloc, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 752 | }; |
| 753 | |
NeilBrown | 4f7774c | 2006-03-27 01:15:03 -0800 | [diff] [blame] | 754 | static struct svc_export * |
| 755 | svc_export_lookup(struct svc_export *exp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 756 | { |
NeilBrown | 4f7774c | 2006-03-27 01:15:03 -0800 | [diff] [blame] | 757 | struct cache_head *ch; |
| 758 | int hash; |
| 759 | hash = hash_ptr(exp->ex_client, EXPORT_HASHBITS); |
| 760 | hash ^= hash_ptr(exp->ex_dentry, EXPORT_HASHBITS); |
| 761 | hash ^= hash_ptr(exp->ex_mnt, EXPORT_HASHBITS); |
| 762 | |
| 763 | ch = sunrpc_cache_lookup(&svc_export_cache, &exp->h, |
| 764 | hash); |
| 765 | if (ch) |
| 766 | return container_of(ch, struct svc_export, h); |
| 767 | else |
| 768 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 769 | } |
| 770 | |
Adrian Bunk | 74cae61 | 2006-03-27 01:15:10 -0800 | [diff] [blame] | 771 | static struct svc_export * |
NeilBrown | 4f7774c | 2006-03-27 01:15:03 -0800 | [diff] [blame] | 772 | svc_export_update(struct svc_export *new, struct svc_export *old) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 773 | { |
NeilBrown | 4f7774c | 2006-03-27 01:15:03 -0800 | [diff] [blame] | 774 | struct cache_head *ch; |
| 775 | int hash; |
| 776 | hash = hash_ptr(old->ex_client, EXPORT_HASHBITS); |
| 777 | hash ^= hash_ptr(old->ex_dentry, EXPORT_HASHBITS); |
| 778 | hash ^= hash_ptr(old->ex_mnt, EXPORT_HASHBITS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 779 | |
NeilBrown | 4f7774c | 2006-03-27 01:15:03 -0800 | [diff] [blame] | 780 | ch = sunrpc_cache_update(&svc_export_cache, &new->h, |
| 781 | &old->h, |
| 782 | hash); |
| 783 | if (ch) |
| 784 | return container_of(ch, struct svc_export, h); |
| 785 | else |
| 786 | return NULL; |
| 787 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 788 | |
| 789 | |
Adrian Bunk | 74cae61 | 2006-03-27 01:15:10 -0800 | [diff] [blame] | 790 | static struct svc_expkey * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 791 | exp_find_key(svc_client *clp, int fsid_type, u32 *fsidv, struct cache_req *reqp) |
| 792 | { |
| 793 | struct svc_expkey key, *ek; |
| 794 | int err; |
| 795 | |
| 796 | if (!clp) |
J. Bruce Fields | 2d3bb25 | 2007-07-17 04:04:40 -0700 | [diff] [blame] | 797 | return ERR_PTR(-ENOENT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 798 | |
| 799 | key.ek_client = clp; |
| 800 | key.ek_fsidtype = fsid_type; |
| 801 | memcpy(key.ek_fsid, fsidv, key_len(fsid_type)); |
| 802 | |
NeilBrown | 8d270f7f | 2006-03-27 01:15:04 -0800 | [diff] [blame] | 803 | ek = svc_expkey_lookup(&key); |
J. Bruce Fields | 2d3bb25 | 2007-07-17 04:04:40 -0700 | [diff] [blame] | 804 | if (ek == NULL) |
| 805 | return ERR_PTR(-ENOMEM); |
| 806 | err = cache_check(&svc_expkey_cache, &ek->h, reqp); |
| 807 | if (err) |
| 808 | return ERR_PTR(err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 809 | return ek; |
| 810 | } |
| 811 | |
| 812 | static int exp_set_key(svc_client *clp, int fsid_type, u32 *fsidv, |
| 813 | struct svc_export *exp) |
| 814 | { |
| 815 | struct svc_expkey key, *ek; |
| 816 | |
| 817 | key.ek_client = clp; |
| 818 | key.ek_fsidtype = fsid_type; |
| 819 | memcpy(key.ek_fsid, fsidv, key_len(fsid_type)); |
NeilBrown | eab7e2e | 2006-03-27 01:15:00 -0800 | [diff] [blame] | 820 | key.ek_mnt = exp->ex_mnt; |
| 821 | key.ek_dentry = exp->ex_dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 822 | key.h.expiry_time = NEVER; |
| 823 | key.h.flags = 0; |
| 824 | |
NeilBrown | 8d270f7f | 2006-03-27 01:15:04 -0800 | [diff] [blame] | 825 | ek = svc_expkey_lookup(&key); |
| 826 | if (ek) |
| 827 | ek = svc_expkey_update(&key,ek); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 828 | if (ek) { |
NeilBrown | baab935 | 2006-03-27 01:15:09 -0800 | [diff] [blame] | 829 | cache_put(&ek->h, &svc_expkey_cache); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 830 | return 0; |
| 831 | } |
| 832 | return -ENOMEM; |
| 833 | } |
| 834 | |
| 835 | /* |
| 836 | * Find the client's export entry matching xdev/xino. |
| 837 | */ |
| 838 | static inline struct svc_expkey * |
| 839 | exp_get_key(svc_client *clp, dev_t dev, ino_t ino) |
| 840 | { |
| 841 | u32 fsidv[3]; |
| 842 | |
| 843 | if (old_valid_dev(dev)) { |
NeilBrown | af6a4e2 | 2007-02-14 00:33:12 -0800 | [diff] [blame] | 844 | mk_fsid(FSID_DEV, fsidv, dev, ino, 0, NULL); |
| 845 | return exp_find_key(clp, FSID_DEV, fsidv, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 846 | } |
NeilBrown | af6a4e2 | 2007-02-14 00:33:12 -0800 | [diff] [blame] | 847 | mk_fsid(FSID_ENCODE_DEV, fsidv, dev, ino, 0, NULL); |
| 848 | return exp_find_key(clp, FSID_ENCODE_DEV, fsidv, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 849 | } |
| 850 | |
| 851 | /* |
| 852 | * Find the client's export entry matching fsid |
| 853 | */ |
| 854 | static inline struct svc_expkey * |
| 855 | exp_get_fsid_key(svc_client *clp, int fsid) |
| 856 | { |
| 857 | u32 fsidv[2]; |
| 858 | |
NeilBrown | af6a4e2 | 2007-02-14 00:33:12 -0800 | [diff] [blame] | 859 | mk_fsid(FSID_NUM, fsidv, 0, 0, fsid, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 860 | |
NeilBrown | af6a4e2 | 2007-02-14 00:33:12 -0800 | [diff] [blame] | 861 | return exp_find_key(clp, FSID_NUM, fsidv, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 862 | } |
| 863 | |
| 864 | svc_export * |
| 865 | exp_get_by_name(svc_client *clp, struct vfsmount *mnt, struct dentry *dentry, |
| 866 | struct cache_req *reqp) |
| 867 | { |
| 868 | struct svc_export *exp, key; |
J. Bruce Fields | 2d3bb25 | 2007-07-17 04:04:40 -0700 | [diff] [blame] | 869 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 870 | |
| 871 | if (!clp) |
J. Bruce Fields | 2d3bb25 | 2007-07-17 04:04:40 -0700 | [diff] [blame] | 872 | return ERR_PTR(-ENOENT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 873 | |
| 874 | key.ex_client = clp; |
| 875 | key.ex_mnt = mnt; |
| 876 | key.ex_dentry = dentry; |
| 877 | |
NeilBrown | 4f7774c | 2006-03-27 01:15:03 -0800 | [diff] [blame] | 878 | exp = svc_export_lookup(&key); |
J. Bruce Fields | 2d3bb25 | 2007-07-17 04:04:40 -0700 | [diff] [blame] | 879 | if (exp == NULL) |
| 880 | return ERR_PTR(-ENOMEM); |
| 881 | err = cache_check(&svc_export_cache, &exp->h, reqp); |
| 882 | if (err) |
| 883 | return ERR_PTR(err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 884 | return exp; |
| 885 | } |
| 886 | |
| 887 | /* |
| 888 | * Find the export entry for a given dentry. |
| 889 | */ |
| 890 | struct svc_export * |
| 891 | exp_parent(svc_client *clp, struct vfsmount *mnt, struct dentry *dentry, |
| 892 | struct cache_req *reqp) |
| 893 | { |
| 894 | svc_export *exp; |
| 895 | |
| 896 | dget(dentry); |
| 897 | exp = exp_get_by_name(clp, mnt, dentry, reqp); |
| 898 | |
J. Bruce Fields | 2d3bb25 | 2007-07-17 04:04:40 -0700 | [diff] [blame] | 899 | while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(dentry)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 900 | struct dentry *parent; |
| 901 | |
| 902 | parent = dget_parent(dentry); |
| 903 | dput(dentry); |
| 904 | dentry = parent; |
| 905 | exp = exp_get_by_name(clp, mnt, dentry, reqp); |
| 906 | } |
| 907 | dput(dentry); |
| 908 | return exp; |
| 909 | } |
| 910 | |
| 911 | /* |
| 912 | * Hashtable locking. Write locks are placed only by user processes |
| 913 | * wanting to modify export information. |
| 914 | * Write locking only done in this file. Read locking |
| 915 | * needed externally. |
| 916 | */ |
| 917 | |
| 918 | static DECLARE_RWSEM(hash_sem); |
| 919 | |
| 920 | void |
| 921 | exp_readlock(void) |
| 922 | { |
| 923 | down_read(&hash_sem); |
| 924 | } |
| 925 | |
| 926 | static inline void |
| 927 | exp_writelock(void) |
| 928 | { |
| 929 | down_write(&hash_sem); |
| 930 | } |
| 931 | |
| 932 | void |
| 933 | exp_readunlock(void) |
| 934 | { |
| 935 | up_read(&hash_sem); |
| 936 | } |
| 937 | |
| 938 | static inline void |
| 939 | exp_writeunlock(void) |
| 940 | { |
| 941 | up_write(&hash_sem); |
| 942 | } |
| 943 | |
| 944 | static void exp_fsid_unhash(struct svc_export *exp) |
| 945 | { |
| 946 | struct svc_expkey *ek; |
| 947 | |
| 948 | if ((exp->ex_flags & NFSEXP_FSID) == 0) |
| 949 | return; |
| 950 | |
| 951 | ek = exp_get_fsid_key(exp->ex_client, exp->ex_fsid); |
J. Bruce Fields | 2d3bb25 | 2007-07-17 04:04:40 -0700 | [diff] [blame] | 952 | if (!IS_ERR(ek)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 953 | ek->h.expiry_time = get_seconds()-1; |
NeilBrown | baab935 | 2006-03-27 01:15:09 -0800 | [diff] [blame] | 954 | cache_put(&ek->h, &svc_expkey_cache); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 955 | } |
| 956 | svc_expkey_cache.nextcheck = get_seconds(); |
| 957 | } |
| 958 | |
| 959 | static int exp_fsid_hash(svc_client *clp, struct svc_export *exp) |
| 960 | { |
| 961 | u32 fsid[2]; |
| 962 | |
| 963 | if ((exp->ex_flags & NFSEXP_FSID) == 0) |
| 964 | return 0; |
| 965 | |
NeilBrown | af6a4e2 | 2007-02-14 00:33:12 -0800 | [diff] [blame] | 966 | mk_fsid(FSID_NUM, fsid, 0, 0, exp->ex_fsid, NULL); |
| 967 | return exp_set_key(clp, FSID_NUM, fsid, exp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 968 | } |
| 969 | |
| 970 | static int exp_hash(struct auth_domain *clp, struct svc_export *exp) |
| 971 | { |
| 972 | u32 fsid[2]; |
| 973 | struct inode *inode = exp->ex_dentry->d_inode; |
| 974 | dev_t dev = inode->i_sb->s_dev; |
| 975 | |
| 976 | if (old_valid_dev(dev)) { |
NeilBrown | af6a4e2 | 2007-02-14 00:33:12 -0800 | [diff] [blame] | 977 | mk_fsid(FSID_DEV, fsid, dev, inode->i_ino, 0, NULL); |
| 978 | return exp_set_key(clp, FSID_DEV, fsid, exp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 979 | } |
NeilBrown | af6a4e2 | 2007-02-14 00:33:12 -0800 | [diff] [blame] | 980 | mk_fsid(FSID_ENCODE_DEV, fsid, dev, inode->i_ino, 0, NULL); |
| 981 | return exp_set_key(clp, FSID_ENCODE_DEV, fsid, exp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 982 | } |
| 983 | |
| 984 | static void exp_unhash(struct svc_export *exp) |
| 985 | { |
| 986 | struct svc_expkey *ek; |
| 987 | struct inode *inode = exp->ex_dentry->d_inode; |
| 988 | |
| 989 | ek = exp_get_key(exp->ex_client, inode->i_sb->s_dev, inode->i_ino); |
J. Bruce Fields | 2d3bb25 | 2007-07-17 04:04:40 -0700 | [diff] [blame] | 990 | if (!IS_ERR(ek)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 991 | ek->h.expiry_time = get_seconds()-1; |
NeilBrown | baab935 | 2006-03-27 01:15:09 -0800 | [diff] [blame] | 992 | cache_put(&ek->h, &svc_expkey_cache); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 993 | } |
| 994 | svc_expkey_cache.nextcheck = get_seconds(); |
| 995 | } |
| 996 | |
| 997 | /* |
| 998 | * Export a file system. |
| 999 | */ |
| 1000 | int |
| 1001 | exp_export(struct nfsctl_export *nxp) |
| 1002 | { |
| 1003 | svc_client *clp; |
| 1004 | struct svc_export *exp = NULL; |
| 1005 | struct svc_export new; |
| 1006 | struct svc_expkey *fsid_key = NULL; |
| 1007 | struct nameidata nd; |
| 1008 | int err; |
| 1009 | |
| 1010 | /* Consistency check */ |
| 1011 | err = -EINVAL; |
| 1012 | if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) || |
| 1013 | !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX)) |
| 1014 | goto out; |
| 1015 | |
| 1016 | dprintk("exp_export called for %s:%s (%x/%ld fl %x).\n", |
| 1017 | nxp->ex_client, nxp->ex_path, |
| 1018 | (unsigned)nxp->ex_dev, (long)nxp->ex_ino, |
| 1019 | nxp->ex_flags); |
| 1020 | |
| 1021 | /* Try to lock the export table for update */ |
| 1022 | exp_writelock(); |
| 1023 | |
| 1024 | /* Look up client info */ |
| 1025 | if (!(clp = auth_domain_find(nxp->ex_client))) |
| 1026 | goto out_unlock; |
| 1027 | |
| 1028 | |
| 1029 | /* Look up the dentry */ |
| 1030 | err = path_lookup(nxp->ex_path, 0, &nd); |
| 1031 | if (err) |
| 1032 | goto out_unlock; |
| 1033 | err = -EINVAL; |
| 1034 | |
| 1035 | exp = exp_get_by_name(clp, nd.mnt, nd.dentry, NULL); |
| 1036 | |
NeilBrown | f988443 | 2006-12-13 00:35:45 -0800 | [diff] [blame] | 1037 | memset(&new, 0, sizeof(new)); |
| 1038 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1039 | /* must make sure there won't be an ex_fsid clash */ |
| 1040 | if ((nxp->ex_flags & NFSEXP_FSID) && |
J. Bruce Fields | 2d3bb25 | 2007-07-17 04:04:40 -0700 | [diff] [blame] | 1041 | (!IS_ERR(fsid_key = exp_get_fsid_key(clp, nxp->ex_dev))) && |
NeilBrown | eab7e2e | 2006-03-27 01:15:00 -0800 | [diff] [blame] | 1042 | fsid_key->ek_mnt && |
| 1043 | (fsid_key->ek_mnt != nd.mnt || fsid_key->ek_dentry != nd.dentry) ) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1044 | goto finish; |
| 1045 | |
J. Bruce Fields | 2d3bb25 | 2007-07-17 04:04:40 -0700 | [diff] [blame] | 1046 | if (!IS_ERR(exp)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1047 | /* just a flags/id/fsid update */ |
| 1048 | |
| 1049 | exp_fsid_unhash(exp); |
| 1050 | exp->ex_flags = nxp->ex_flags; |
| 1051 | exp->ex_anon_uid = nxp->ex_anon_uid; |
| 1052 | exp->ex_anon_gid = nxp->ex_anon_gid; |
| 1053 | exp->ex_fsid = nxp->ex_dev; |
| 1054 | |
| 1055 | err = exp_fsid_hash(clp, exp); |
| 1056 | goto finish; |
| 1057 | } |
| 1058 | |
NeilBrown | af6a4e2 | 2007-02-14 00:33:12 -0800 | [diff] [blame] | 1059 | err = check_export(nd.dentry->d_inode, nxp->ex_flags, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1060 | if (err) goto finish; |
| 1061 | |
| 1062 | err = -ENOMEM; |
| 1063 | |
| 1064 | dprintk("nfsd: creating export entry %p for client %p\n", exp, clp); |
| 1065 | |
| 1066 | new.h.expiry_time = NEVER; |
| 1067 | new.h.flags = 0; |
NeilBrown | f988443 | 2006-12-13 00:35:45 -0800 | [diff] [blame] | 1068 | new.ex_path = kstrdup(nxp->ex_path, GFP_KERNEL); |
| 1069 | if (!new.ex_path) |
| 1070 | goto finish; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1071 | new.ex_client = clp; |
| 1072 | new.ex_mnt = nd.mnt; |
| 1073 | new.ex_dentry = nd.dentry; |
| 1074 | new.ex_flags = nxp->ex_flags; |
| 1075 | new.ex_anon_uid = nxp->ex_anon_uid; |
| 1076 | new.ex_anon_gid = nxp->ex_anon_gid; |
| 1077 | new.ex_fsid = nxp->ex_dev; |
| 1078 | |
NeilBrown | 4f7774c | 2006-03-27 01:15:03 -0800 | [diff] [blame] | 1079 | exp = svc_export_lookup(&new); |
| 1080 | if (exp) |
| 1081 | exp = svc_export_update(&new, exp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1082 | |
NeilBrown | 4f7774c | 2006-03-27 01:15:03 -0800 | [diff] [blame] | 1083 | if (!exp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1084 | goto finish; |
| 1085 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1086 | if (exp_hash(clp, exp) || |
| 1087 | exp_fsid_hash(clp, exp)) { |
| 1088 | /* failed to create at least one index */ |
| 1089 | exp_do_unexport(exp); |
| 1090 | cache_flush(); |
NeilBrown | f988443 | 2006-12-13 00:35:45 -0800 | [diff] [blame] | 1091 | } else |
| 1092 | err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1093 | finish: |
NeilBrown | f988443 | 2006-12-13 00:35:45 -0800 | [diff] [blame] | 1094 | if (new.ex_path) |
| 1095 | kfree(new.ex_path); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1096 | if (exp) |
| 1097 | exp_put(exp); |
| 1098 | if (fsid_key && !IS_ERR(fsid_key)) |
NeilBrown | baab935 | 2006-03-27 01:15:09 -0800 | [diff] [blame] | 1099 | cache_put(&fsid_key->h, &svc_expkey_cache); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1100 | if (clp) |
| 1101 | auth_domain_put(clp); |
| 1102 | path_release(&nd); |
| 1103 | out_unlock: |
| 1104 | exp_writeunlock(); |
| 1105 | out: |
| 1106 | return err; |
| 1107 | } |
| 1108 | |
| 1109 | /* |
| 1110 | * Unexport a file system. The export entry has already |
| 1111 | * been removed from the client's list of exported fs's. |
| 1112 | */ |
| 1113 | static void |
| 1114 | exp_do_unexport(svc_export *unexp) |
| 1115 | { |
| 1116 | unexp->h.expiry_time = get_seconds()-1; |
| 1117 | svc_export_cache.nextcheck = get_seconds(); |
| 1118 | exp_unhash(unexp); |
| 1119 | exp_fsid_unhash(unexp); |
| 1120 | } |
| 1121 | |
| 1122 | |
| 1123 | /* |
| 1124 | * unexport syscall. |
| 1125 | */ |
| 1126 | int |
| 1127 | exp_unexport(struct nfsctl_export *nxp) |
| 1128 | { |
| 1129 | struct auth_domain *dom; |
| 1130 | svc_export *exp; |
| 1131 | struct nameidata nd; |
| 1132 | int err; |
| 1133 | |
| 1134 | /* Consistency check */ |
| 1135 | if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) || |
| 1136 | !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX)) |
| 1137 | return -EINVAL; |
| 1138 | |
| 1139 | exp_writelock(); |
| 1140 | |
| 1141 | err = -EINVAL; |
| 1142 | dom = auth_domain_find(nxp->ex_client); |
| 1143 | if (!dom) { |
| 1144 | dprintk("nfsd: unexport couldn't find %s\n", nxp->ex_client); |
| 1145 | goto out_unlock; |
| 1146 | } |
| 1147 | |
| 1148 | err = path_lookup(nxp->ex_path, 0, &nd); |
| 1149 | if (err) |
| 1150 | goto out_domain; |
| 1151 | |
| 1152 | err = -EINVAL; |
| 1153 | exp = exp_get_by_name(dom, nd.mnt, nd.dentry, NULL); |
| 1154 | path_release(&nd); |
J. Bruce Fields | 2d3bb25 | 2007-07-17 04:04:40 -0700 | [diff] [blame] | 1155 | if (IS_ERR(exp)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1156 | goto out_domain; |
| 1157 | |
| 1158 | exp_do_unexport(exp); |
| 1159 | exp_put(exp); |
| 1160 | err = 0; |
| 1161 | |
| 1162 | out_domain: |
| 1163 | auth_domain_put(dom); |
| 1164 | cache_flush(); |
| 1165 | out_unlock: |
| 1166 | exp_writeunlock(); |
| 1167 | return err; |
| 1168 | } |
| 1169 | |
| 1170 | /* |
| 1171 | * Obtain the root fh on behalf of a client. |
| 1172 | * This could be done in user space, but I feel that it adds some safety |
| 1173 | * since its harder to fool a kernel module than a user space program. |
| 1174 | */ |
| 1175 | int |
| 1176 | exp_rootfh(svc_client *clp, char *path, struct knfsd_fh *f, int maxsize) |
| 1177 | { |
| 1178 | struct svc_export *exp; |
| 1179 | struct nameidata nd; |
| 1180 | struct inode *inode; |
| 1181 | struct svc_fh fh; |
| 1182 | int err; |
| 1183 | |
| 1184 | err = -EPERM; |
| 1185 | /* NB: we probably ought to check that it's NUL-terminated */ |
| 1186 | if (path_lookup(path, 0, &nd)) { |
| 1187 | printk("nfsd: exp_rootfh path not found %s", path); |
| 1188 | return err; |
| 1189 | } |
| 1190 | inode = nd.dentry->d_inode; |
| 1191 | |
| 1192 | dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n", |
| 1193 | path, nd.dentry, clp->name, |
| 1194 | inode->i_sb->s_id, inode->i_ino); |
| 1195 | exp = exp_parent(clp, nd.mnt, nd.dentry, NULL); |
J.Bruce Fields | 4b41bd8 | 2006-12-13 00:35:21 -0800 | [diff] [blame] | 1196 | if (IS_ERR(exp)) { |
| 1197 | err = PTR_ERR(exp); |
| 1198 | goto out; |
| 1199 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1200 | |
| 1201 | /* |
| 1202 | * fh must be initialized before calling fh_compose |
| 1203 | */ |
| 1204 | fh_init(&fh, maxsize); |
| 1205 | if (fh_compose(&fh, exp, nd.dentry, NULL)) |
| 1206 | err = -EINVAL; |
| 1207 | else |
| 1208 | err = 0; |
| 1209 | memcpy(f, &fh.fh_handle, sizeof(struct knfsd_fh)); |
| 1210 | fh_put(&fh); |
| 1211 | exp_put(exp); |
| 1212 | out: |
| 1213 | path_release(&nd); |
| 1214 | return err; |
| 1215 | } |
| 1216 | |
NeilBrown | eab7e2e | 2006-03-27 01:15:00 -0800 | [diff] [blame] | 1217 | struct svc_export * |
| 1218 | exp_find(struct auth_domain *clp, int fsid_type, u32 *fsidv, |
| 1219 | struct cache_req *reqp) |
| 1220 | { |
| 1221 | struct svc_export *exp; |
| 1222 | struct svc_expkey *ek = exp_find_key(clp, fsid_type, fsidv, reqp); |
J. Bruce Fields | 2d3bb25 | 2007-07-17 04:04:40 -0700 | [diff] [blame] | 1223 | if (IS_ERR(ek)) |
NeilBrown | eab7e2e | 2006-03-27 01:15:00 -0800 | [diff] [blame] | 1224 | return ERR_PTR(PTR_ERR(ek)); |
| 1225 | |
| 1226 | exp = exp_get_by_name(clp, ek->ek_mnt, ek->ek_dentry, reqp); |
NeilBrown | baab935 | 2006-03-27 01:15:09 -0800 | [diff] [blame] | 1227 | cache_put(&ek->h, &svc_expkey_cache); |
NeilBrown | eab7e2e | 2006-03-27 01:15:00 -0800 | [diff] [blame] | 1228 | |
J. Bruce Fields | 2d3bb25 | 2007-07-17 04:04:40 -0700 | [diff] [blame] | 1229 | if (IS_ERR(exp)) |
NeilBrown | eab7e2e | 2006-03-27 01:15:00 -0800 | [diff] [blame] | 1230 | return ERR_PTR(PTR_ERR(exp)); |
| 1231 | return exp; |
| 1232 | } |
| 1233 | |
Andy Adamson | 32c1eb0 | 2007-07-17 04:04:48 -0700 | [diff] [blame] | 1234 | __be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp) |
| 1235 | { |
| 1236 | struct exp_flavor_info *f; |
| 1237 | struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors; |
| 1238 | |
| 1239 | /* legacy gss-only clients are always OK: */ |
| 1240 | if (exp->ex_client == rqstp->rq_gssclient) |
| 1241 | return 0; |
| 1242 | /* ip-address based client; check sec= export option: */ |
| 1243 | for (f = exp->ex_flavors; f < end; f++) { |
| 1244 | if (f->pseudoflavor == rqstp->rq_flavor) |
| 1245 | return 0; |
| 1246 | } |
| 1247 | /* defaults in absence of sec= options: */ |
| 1248 | if (exp->ex_nflavors == 0) { |
| 1249 | if (rqstp->rq_flavor == RPC_AUTH_NULL || |
| 1250 | rqstp->rq_flavor == RPC_AUTH_UNIX) |
| 1251 | return 0; |
| 1252 | } |
| 1253 | return nfserr_wrongsec; |
| 1254 | } |
| 1255 | |
J. Bruce Fields | 0989a78 | 2007-07-17 04:04:44 -0700 | [diff] [blame] | 1256 | /* |
J. Bruce Fields | 2ea2209 | 2007-07-17 04:04:46 -0700 | [diff] [blame] | 1257 | * Uses rq_client and rq_gssclient to find an export; uses rq_client (an |
| 1258 | * auth_unix client) if it's available and has secinfo information; |
| 1259 | * otherwise, will try to use rq_gssclient. |
| 1260 | * |
J. Bruce Fields | 0989a78 | 2007-07-17 04:04:44 -0700 | [diff] [blame] | 1261 | * Called from functions that handle requests; functions that do work on |
| 1262 | * behalf of mountd are passed a single client name to use, and should |
| 1263 | * use exp_get_by_name() or exp_find(). |
| 1264 | */ |
| 1265 | struct svc_export * |
| 1266 | rqst_exp_get_by_name(struct svc_rqst *rqstp, struct vfsmount *mnt, |
| 1267 | struct dentry *dentry) |
| 1268 | { |
J. Bruce Fields | 9a25b96 | 2007-07-19 01:49:18 -0700 | [diff] [blame] | 1269 | struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT); |
J. Bruce Fields | 3ab4d8b | 2007-07-17 04:04:46 -0700 | [diff] [blame] | 1270 | |
J. Bruce Fields | 2ea2209 | 2007-07-17 04:04:46 -0700 | [diff] [blame] | 1271 | if (rqstp->rq_client == NULL) |
| 1272 | goto gss; |
| 1273 | |
| 1274 | /* First try the auth_unix client: */ |
| 1275 | exp = exp_get_by_name(rqstp->rq_client, mnt, dentry, |
| 1276 | &rqstp->rq_chandle); |
| 1277 | if (PTR_ERR(exp) == -ENOENT) |
| 1278 | goto gss; |
| 1279 | if (IS_ERR(exp)) |
| 1280 | return exp; |
| 1281 | /* If it has secinfo, assume there are no gss/... clients */ |
| 1282 | if (exp->ex_nflavors > 0) |
| 1283 | return exp; |
| 1284 | gss: |
| 1285 | /* Otherwise, try falling back on gss client */ |
| 1286 | if (rqstp->rq_gssclient == NULL) |
| 1287 | return exp; |
| 1288 | gssexp = exp_get_by_name(rqstp->rq_gssclient, mnt, dentry, |
| 1289 | &rqstp->rq_chandle); |
| 1290 | if (PTR_ERR(gssexp) == -ENOENT) |
| 1291 | return exp; |
J. Bruce Fields | 9a25b96 | 2007-07-19 01:49:18 -0700 | [diff] [blame] | 1292 | if (!IS_ERR(exp)) |
J. Bruce Fields | 2ea2209 | 2007-07-17 04:04:46 -0700 | [diff] [blame] | 1293 | exp_put(exp); |
| 1294 | return gssexp; |
J. Bruce Fields | 0989a78 | 2007-07-17 04:04:44 -0700 | [diff] [blame] | 1295 | } |
| 1296 | |
| 1297 | struct svc_export * |
| 1298 | rqst_exp_find(struct svc_rqst *rqstp, int fsid_type, u32 *fsidv) |
| 1299 | { |
J. Bruce Fields | 9a25b96 | 2007-07-19 01:49:18 -0700 | [diff] [blame] | 1300 | struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT); |
J. Bruce Fields | 3ab4d8b | 2007-07-17 04:04:46 -0700 | [diff] [blame] | 1301 | |
J. Bruce Fields | 2ea2209 | 2007-07-17 04:04:46 -0700 | [diff] [blame] | 1302 | if (rqstp->rq_client == NULL) |
| 1303 | goto gss; |
| 1304 | |
| 1305 | /* First try the auth_unix client: */ |
| 1306 | exp = exp_find(rqstp->rq_client, fsid_type, fsidv, &rqstp->rq_chandle); |
| 1307 | if (PTR_ERR(exp) == -ENOENT) |
| 1308 | goto gss; |
| 1309 | if (IS_ERR(exp)) |
| 1310 | return exp; |
| 1311 | /* If it has secinfo, assume there are no gss/... clients */ |
| 1312 | if (exp->ex_nflavors > 0) |
| 1313 | return exp; |
| 1314 | gss: |
| 1315 | /* Otherwise, try falling back on gss client */ |
| 1316 | if (rqstp->rq_gssclient == NULL) |
| 1317 | return exp; |
| 1318 | gssexp = exp_find(rqstp->rq_gssclient, fsid_type, fsidv, |
| 1319 | &rqstp->rq_chandle); |
| 1320 | if (PTR_ERR(gssexp) == -ENOENT) |
| 1321 | return exp; |
J. Bruce Fields | 9a25b96 | 2007-07-19 01:49:18 -0700 | [diff] [blame] | 1322 | if (!IS_ERR(exp)) |
J. Bruce Fields | 2ea2209 | 2007-07-17 04:04:46 -0700 | [diff] [blame] | 1323 | exp_put(exp); |
| 1324 | return gssexp; |
J. Bruce Fields | 0989a78 | 2007-07-17 04:04:44 -0700 | [diff] [blame] | 1325 | } |
| 1326 | |
| 1327 | struct svc_export * |
| 1328 | rqst_exp_parent(struct svc_rqst *rqstp, struct vfsmount *mnt, |
| 1329 | struct dentry *dentry) |
| 1330 | { |
J. Bruce Fields | 2ea2209 | 2007-07-17 04:04:46 -0700 | [diff] [blame] | 1331 | struct svc_export *exp; |
J. Bruce Fields | 3ab4d8b | 2007-07-17 04:04:46 -0700 | [diff] [blame] | 1332 | |
J. Bruce Fields | 2ea2209 | 2007-07-17 04:04:46 -0700 | [diff] [blame] | 1333 | dget(dentry); |
| 1334 | exp = rqst_exp_get_by_name(rqstp, mnt, dentry); |
| 1335 | |
| 1336 | while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(dentry)) { |
| 1337 | struct dentry *parent; |
| 1338 | |
| 1339 | parent = dget_parent(dentry); |
| 1340 | dput(dentry); |
| 1341 | dentry = parent; |
| 1342 | exp = rqst_exp_get_by_name(rqstp, mnt, dentry); |
| 1343 | } |
| 1344 | dput(dentry); |
| 1345 | return exp; |
J. Bruce Fields | 0989a78 | 2007-07-17 04:04:44 -0700 | [diff] [blame] | 1346 | } |
NeilBrown | eab7e2e | 2006-03-27 01:15:00 -0800 | [diff] [blame] | 1347 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1348 | /* |
| 1349 | * Called when we need the filehandle for the root of the pseudofs, |
| 1350 | * for a given NFSv4 client. The root is defined to be the |
| 1351 | * export point with fsid==0 |
| 1352 | */ |
Al Viro | c7afef1 | 2006-10-19 23:29:02 -0700 | [diff] [blame] | 1353 | __be32 |
J. Bruce Fields | df547ef | 2007-07-17 04:04:43 -0700 | [diff] [blame] | 1354 | exp_pseudoroot(struct svc_rqst *rqstp, struct svc_fh *fhp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1355 | { |
NeilBrown | eab7e2e | 2006-03-27 01:15:00 -0800 | [diff] [blame] | 1356 | struct svc_export *exp; |
Al Viro | c7afef1 | 2006-10-19 23:29:02 -0700 | [diff] [blame] | 1357 | __be32 rv; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1358 | u32 fsidv[2]; |
| 1359 | |
NeilBrown | af6a4e2 | 2007-02-14 00:33:12 -0800 | [diff] [blame] | 1360 | mk_fsid(FSID_NUM, fsidv, 0, 0, 0, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1361 | |
J. Bruce Fields | 0989a78 | 2007-07-17 04:04:44 -0700 | [diff] [blame] | 1362 | exp = rqst_exp_find(rqstp, FSID_NUM, fsidv); |
J. Bruce Fields | 2d3bb25 | 2007-07-17 04:04:40 -0700 | [diff] [blame] | 1363 | if (PTR_ERR(exp) == -ENOENT) |
| 1364 | return nfserr_perm; |
J.Bruce Fields | 6899320 | 2006-12-13 00:35:23 -0800 | [diff] [blame] | 1365 | if (IS_ERR(exp)) |
| 1366 | return nfserrno(PTR_ERR(exp)); |
J.Bruce Fields | d0ebd9c | 2006-10-04 02:16:10 -0700 | [diff] [blame] | 1367 | rv = fh_compose(fhp, exp, exp->ex_dentry, NULL); |
Andy Adamson | 32c1eb0 | 2007-07-17 04:04:48 -0700 | [diff] [blame] | 1368 | if (rv) |
| 1369 | goto out; |
| 1370 | rv = check_nfsd_access(exp, rqstp); |
| 1371 | out: |
J.Bruce Fields | d0ebd9c | 2006-10-04 02:16:10 -0700 | [diff] [blame] | 1372 | exp_put(exp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1373 | return rv; |
| 1374 | } |
| 1375 | |
| 1376 | /* Iterator */ |
| 1377 | |
| 1378 | static void *e_start(struct seq_file *m, loff_t *pos) |
Josh Triplett | 896440d | 2006-10-02 02:17:50 -0700 | [diff] [blame] | 1379 | __acquires(svc_export_cache.hash_lock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1380 | { |
| 1381 | loff_t n = *pos; |
| 1382 | unsigned hash, export; |
| 1383 | struct cache_head *ch; |
| 1384 | |
| 1385 | exp_readlock(); |
| 1386 | read_lock(&svc_export_cache.hash_lock); |
| 1387 | if (!n--) |
Greg Banks | bc6f02e | 2006-10-02 02:17:49 -0700 | [diff] [blame] | 1388 | return SEQ_START_TOKEN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1389 | hash = n >> 32; |
| 1390 | export = n & ((1LL<<32) - 1); |
| 1391 | |
| 1392 | |
| 1393 | for (ch=export_table[hash]; ch; ch=ch->next) |
| 1394 | if (!export--) |
| 1395 | return ch; |
| 1396 | n &= ~((1LL<<32) - 1); |
| 1397 | do { |
| 1398 | hash++; |
| 1399 | n += 1LL<<32; |
| 1400 | } while(hash < EXPORT_HASHMAX && export_table[hash]==NULL); |
| 1401 | if (hash >= EXPORT_HASHMAX) |
| 1402 | return NULL; |
| 1403 | *pos = n+1; |
| 1404 | return export_table[hash]; |
| 1405 | } |
| 1406 | |
| 1407 | static void *e_next(struct seq_file *m, void *p, loff_t *pos) |
| 1408 | { |
| 1409 | struct cache_head *ch = p; |
| 1410 | int hash = (*pos >> 32); |
| 1411 | |
Greg Banks | bc6f02e | 2006-10-02 02:17:49 -0700 | [diff] [blame] | 1412 | if (p == SEQ_START_TOKEN) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1413 | hash = 0; |
| 1414 | else if (ch->next == NULL) { |
| 1415 | hash++; |
| 1416 | *pos += 1LL<<32; |
| 1417 | } else { |
| 1418 | ++*pos; |
| 1419 | return ch->next; |
| 1420 | } |
| 1421 | *pos &= ~((1LL<<32) - 1); |
| 1422 | while (hash < EXPORT_HASHMAX && export_table[hash] == NULL) { |
| 1423 | hash++; |
| 1424 | *pos += 1LL<<32; |
| 1425 | } |
| 1426 | if (hash >= EXPORT_HASHMAX) |
| 1427 | return NULL; |
| 1428 | ++*pos; |
| 1429 | return export_table[hash]; |
| 1430 | } |
| 1431 | |
| 1432 | static void e_stop(struct seq_file *m, void *p) |
Josh Triplett | 896440d | 2006-10-02 02:17:50 -0700 | [diff] [blame] | 1433 | __releases(svc_export_cache.hash_lock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1434 | { |
| 1435 | read_unlock(&svc_export_cache.hash_lock); |
| 1436 | exp_readunlock(); |
| 1437 | } |
| 1438 | |
| 1439 | static struct flags { |
| 1440 | int flag; |
| 1441 | char *name[2]; |
| 1442 | } expflags[] = { |
| 1443 | { NFSEXP_READONLY, {"ro", "rw"}}, |
| 1444 | { NFSEXP_INSECURE_PORT, {"insecure", ""}}, |
| 1445 | { NFSEXP_ROOTSQUASH, {"root_squash", "no_root_squash"}}, |
| 1446 | { NFSEXP_ALLSQUASH, {"all_squash", ""}}, |
| 1447 | { NFSEXP_ASYNC, {"async", "sync"}}, |
| 1448 | { NFSEXP_GATHERED_WRITES, {"wdelay", "no_wdelay"}}, |
| 1449 | { NFSEXP_NOHIDE, {"nohide", ""}}, |
| 1450 | { NFSEXP_CROSSMOUNT, {"crossmnt", ""}}, |
| 1451 | { NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}}, |
| 1452 | { NFSEXP_NOAUTHNLM, {"insecure_locks", ""}}, |
| 1453 | #ifdef MSNFS |
| 1454 | { NFSEXP_MSNFS, {"msnfs", ""}}, |
| 1455 | #endif |
| 1456 | { 0, {"", ""}} |
| 1457 | }; |
| 1458 | |
J. Bruce Fields | ac34cdb | 2007-07-17 04:04:49 -0700 | [diff] [blame] | 1459 | static void show_expflags(struct seq_file *m, int flags, int mask) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1460 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1461 | struct flags *flg; |
J. Bruce Fields | ac34cdb | 2007-07-17 04:04:49 -0700 | [diff] [blame] | 1462 | int state, first = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1463 | |
| 1464 | for (flg = expflags; flg->flag; flg++) { |
J. Bruce Fields | ac34cdb | 2007-07-17 04:04:49 -0700 | [diff] [blame] | 1465 | if (flg->flag & ~mask) |
| 1466 | continue; |
| 1467 | state = (flg->flag & flags) ? 0 : 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1468 | if (*flg->name[state]) |
| 1469 | seq_printf(m, "%s%s", first++?",":"", flg->name[state]); |
| 1470 | } |
J. Bruce Fields | ac34cdb | 2007-07-17 04:04:49 -0700 | [diff] [blame] | 1471 | } |
| 1472 | |
J. Bruce Fields | 91fe39d | 2007-07-17 04:04:49 -0700 | [diff] [blame] | 1473 | static void show_secinfo_flags(struct seq_file *m, int flags) |
| 1474 | { |
| 1475 | seq_printf(m, ","); |
| 1476 | show_expflags(m, flags, NFSEXP_SECINFO_FLAGS); |
| 1477 | } |
| 1478 | |
| 1479 | static void show_secinfo(struct seq_file *m, struct svc_export *exp) |
| 1480 | { |
| 1481 | struct exp_flavor_info *f; |
| 1482 | struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors; |
| 1483 | int lastflags = 0, first = 0; |
| 1484 | |
| 1485 | if (exp->ex_nflavors == 0) |
| 1486 | return; |
| 1487 | for (f = exp->ex_flavors; f < end; f++) { |
| 1488 | if (first || f->flags != lastflags) { |
| 1489 | if (!first) |
| 1490 | show_secinfo_flags(m, lastflags); |
| 1491 | seq_printf(m, ",sec=%d", f->pseudoflavor); |
| 1492 | lastflags = f->flags; |
| 1493 | } else { |
| 1494 | seq_printf(m, ":%d", f->pseudoflavor); |
| 1495 | } |
| 1496 | } |
| 1497 | show_secinfo_flags(m, lastflags); |
| 1498 | } |
| 1499 | |
J. Bruce Fields | ac34cdb | 2007-07-17 04:04:49 -0700 | [diff] [blame] | 1500 | static void exp_flags(struct seq_file *m, int flag, int fsid, |
| 1501 | uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fsloc) |
| 1502 | { |
| 1503 | show_expflags(m, flag, NFSEXP_ALLFLAGS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1504 | if (flag & NFSEXP_FSID) |
J. Bruce Fields | ac34cdb | 2007-07-17 04:04:49 -0700 | [diff] [blame] | 1505 | seq_printf(m, ",fsid=%d", fsid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1506 | if (anonu != (uid_t)-2 && anonu != (0x10000-2)) |
J. Bruce Fields | 3e63516 | 2007-07-21 04:37:30 -0700 | [diff] [blame] | 1507 | seq_printf(m, ",anonuid=%u", anonu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1508 | if (anong != (gid_t)-2 && anong != (0x10000-2)) |
J. Bruce Fields | 3e63516 | 2007-07-21 04:37:30 -0700 | [diff] [blame] | 1509 | seq_printf(m, ",anongid=%u", anong); |
Manoj Naik | 93346919 | 2006-10-04 02:16:18 -0700 | [diff] [blame] | 1510 | if (fsloc && fsloc->locations_count > 0) { |
| 1511 | char *loctype = (fsloc->migrated) ? "refer" : "replicas"; |
| 1512 | int i; |
| 1513 | |
J. Bruce Fields | ac34cdb | 2007-07-17 04:04:49 -0700 | [diff] [blame] | 1514 | seq_printf(m, ",%s=", loctype); |
Manoj Naik | 93346919 | 2006-10-04 02:16:18 -0700 | [diff] [blame] | 1515 | seq_escape(m, fsloc->locations[0].path, ",;@ \t\n\\"); |
| 1516 | seq_putc(m, '@'); |
| 1517 | seq_escape(m, fsloc->locations[0].hosts, ",;@ \t\n\\"); |
| 1518 | for (i = 1; i < fsloc->locations_count; i++) { |
| 1519 | seq_putc(m, ';'); |
| 1520 | seq_escape(m, fsloc->locations[i].path, ",;@ \t\n\\"); |
| 1521 | seq_putc(m, '@'); |
| 1522 | seq_escape(m, fsloc->locations[i].hosts, ",;@ \t\n\\"); |
| 1523 | } |
| 1524 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1525 | } |
| 1526 | |
| 1527 | static int e_show(struct seq_file *m, void *p) |
| 1528 | { |
| 1529 | struct cache_head *cp = p; |
| 1530 | struct svc_export *exp = container_of(cp, struct svc_export, h); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1531 | |
Greg Banks | bc6f02e | 2006-10-02 02:17:49 -0700 | [diff] [blame] | 1532 | if (p == SEQ_START_TOKEN) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1533 | seq_puts(m, "# Version 1.1\n"); |
| 1534 | seq_puts(m, "# Path Client(Flags) # IPs\n"); |
| 1535 | return 0; |
| 1536 | } |
| 1537 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1538 | cache_get(&exp->h); |
| 1539 | if (cache_check(&svc_export_cache, &exp->h, NULL)) |
| 1540 | return 0; |
NeilBrown | baab935 | 2006-03-27 01:15:09 -0800 | [diff] [blame] | 1541 | cache_put(&exp->h, &svc_export_cache); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1542 | return svc_export_show(m, &svc_export_cache, cp); |
| 1543 | } |
| 1544 | |
| 1545 | struct seq_operations nfs_exports_op = { |
| 1546 | .start = e_start, |
| 1547 | .next = e_next, |
| 1548 | .stop = e_stop, |
| 1549 | .show = e_show, |
| 1550 | }; |
| 1551 | |
| 1552 | /* |
| 1553 | * Add or modify a client. |
| 1554 | * Change requests may involve the list of host addresses. The list of |
| 1555 | * exports and possibly existing uid maps are left untouched. |
| 1556 | */ |
| 1557 | int |
| 1558 | exp_addclient(struct nfsctl_client *ncp) |
| 1559 | { |
| 1560 | struct auth_domain *dom; |
| 1561 | int i, err; |
| 1562 | |
| 1563 | /* First, consistency check. */ |
| 1564 | err = -EINVAL; |
| 1565 | if (! exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX)) |
| 1566 | goto out; |
| 1567 | if (ncp->cl_naddr > NFSCLNT_ADDRMAX) |
| 1568 | goto out; |
| 1569 | |
| 1570 | /* Lock the hashtable */ |
| 1571 | exp_writelock(); |
| 1572 | |
| 1573 | dom = unix_domain_find(ncp->cl_ident); |
| 1574 | |
| 1575 | err = -ENOMEM; |
| 1576 | if (!dom) |
| 1577 | goto out_unlock; |
| 1578 | |
| 1579 | /* Insert client into hashtable. */ |
| 1580 | for (i = 0; i < ncp->cl_naddr; i++) |
| 1581 | auth_unix_add_addr(ncp->cl_addrlist[i], dom); |
| 1582 | |
| 1583 | auth_unix_forget_old(dom); |
| 1584 | auth_domain_put(dom); |
| 1585 | |
| 1586 | err = 0; |
| 1587 | |
| 1588 | out_unlock: |
| 1589 | exp_writeunlock(); |
| 1590 | out: |
| 1591 | return err; |
| 1592 | } |
| 1593 | |
| 1594 | /* |
| 1595 | * Delete a client given an identifier. |
| 1596 | */ |
| 1597 | int |
| 1598 | exp_delclient(struct nfsctl_client *ncp) |
| 1599 | { |
| 1600 | int err; |
| 1601 | struct auth_domain *dom; |
| 1602 | |
| 1603 | err = -EINVAL; |
| 1604 | if (!exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX)) |
| 1605 | goto out; |
| 1606 | |
| 1607 | /* Lock the hashtable */ |
| 1608 | exp_writelock(); |
| 1609 | |
| 1610 | dom = auth_domain_find(ncp->cl_ident); |
| 1611 | /* just make sure that no addresses work |
| 1612 | * and that it will expire soon |
| 1613 | */ |
| 1614 | if (dom) { |
| 1615 | err = auth_unix_forget_old(dom); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1616 | auth_domain_put(dom); |
| 1617 | } |
| 1618 | |
| 1619 | exp_writeunlock(); |
| 1620 | out: |
| 1621 | return err; |
| 1622 | } |
| 1623 | |
| 1624 | /* |
| 1625 | * Verify that string is non-empty and does not exceed max length. |
| 1626 | */ |
| 1627 | static int |
| 1628 | exp_verify_string(char *cp, int max) |
| 1629 | { |
| 1630 | int i; |
| 1631 | |
| 1632 | for (i = 0; i < max; i++) |
| 1633 | if (!cp[i]) |
| 1634 | return i; |
| 1635 | cp[i] = 0; |
| 1636 | printk(KERN_NOTICE "nfsd: couldn't validate string %s\n", cp); |
| 1637 | return 0; |
| 1638 | } |
| 1639 | |
| 1640 | /* |
| 1641 | * Initialize the exports module. |
| 1642 | */ |
| 1643 | void |
| 1644 | nfsd_export_init(void) |
| 1645 | { |
| 1646 | dprintk("nfsd: initializing export module.\n"); |
| 1647 | |
| 1648 | cache_register(&svc_export_cache); |
| 1649 | cache_register(&svc_expkey_cache); |
| 1650 | |
| 1651 | } |
| 1652 | |
| 1653 | /* |
| 1654 | * Flush exports table - called when last nfsd thread is killed |
| 1655 | */ |
| 1656 | void |
| 1657 | nfsd_export_flush(void) |
| 1658 | { |
| 1659 | exp_writelock(); |
| 1660 | cache_purge(&svc_expkey_cache); |
| 1661 | cache_purge(&svc_export_cache); |
| 1662 | exp_writeunlock(); |
| 1663 | } |
| 1664 | |
| 1665 | /* |
| 1666 | * Shutdown the exports module. |
| 1667 | */ |
| 1668 | void |
| 1669 | nfsd_export_shutdown(void) |
| 1670 | { |
| 1671 | |
| 1672 | dprintk("nfsd: shutting down export module.\n"); |
| 1673 | |
| 1674 | exp_writelock(); |
| 1675 | |
| 1676 | if (cache_unregister(&svc_expkey_cache)) |
| 1677 | printk(KERN_ERR "nfsd: failed to unregister expkey cache\n"); |
| 1678 | if (cache_unregister(&svc_export_cache)) |
| 1679 | printk(KERN_ERR "nfsd: failed to unregister export cache\n"); |
| 1680 | svcauth_unix_purge(); |
| 1681 | |
| 1682 | exp_writeunlock(); |
| 1683 | dprintk("nfsd: export shutdown complete.\n"); |
| 1684 | } |