1 #define MSNFS /* HACK HACK */
3 * linux/fs/nfsd/export.c
5 * NFS exporting and validation.
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.
14 * Copyright (C) 1995, 1996 Olaf Kirch, <okir@monad.swb.de>
17 #include <linux/unistd.h>
18 #include <linux/slab.h>
19 #include <linux/stat.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>
28 #include <linux/module.h>
29 #include <linux/exportfs.h>
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 #include <linux/sunrpc/msg_prot.h>
37 #include <linux/sunrpc/gss_api.h>
40 #define NFSDDBG_FACILITY NFSDDBG_EXPORT
42 typedef struct auth_domain svc_client;
43 typedef struct svc_export svc_export;
45 static void exp_do_unexport(svc_export *unexp);
46 static int exp_verify_string(char *cp, int max);
50 * One maps client+vfsmnt+dentry to export options - the export map
51 * The other maps client+filehandle-fragment to export options. - the expkey map
53 * The export options are actually stored in the first map, and the
54 * second map contains a reference to the entry in the first map.
57 #define EXPKEY_HASHBITS 8
58 #define EXPKEY_HASHMAX (1 << EXPKEY_HASHBITS)
59 #define EXPKEY_HASHMASK (EXPKEY_HASHMAX -1)
60 static struct cache_head *expkey_table[EXPKEY_HASHMAX];
62 static void expkey_put(struct kref *ref)
64 struct svc_expkey *key = container_of(ref, struct svc_expkey, h.ref);
66 if (test_bit(CACHE_VALID, &key->h.flags) &&
67 !test_bit(CACHE_NEGATIVE, &key->h.flags))
68 path_put(&key->ek_path);
69 auth_domain_put(key->ek_client);
73 static void expkey_request(struct cache_detail *cd,
75 char **bpp, int *blen)
77 /* client fsidtype \xfsid */
78 struct svc_expkey *ek = container_of(h, struct svc_expkey, h);
81 qword_add(bpp, blen, ek->ek_client->name);
82 snprintf(type, 5, "%d", ek->ek_fsidtype);
83 qword_add(bpp, blen, type);
84 qword_addhex(bpp, blen, (char*)ek->ek_fsid, key_len(ek->ek_fsidtype));
88 static struct svc_expkey *svc_expkey_update(struct svc_expkey *new, struct svc_expkey *old);
89 static struct svc_expkey *svc_expkey_lookup(struct svc_expkey *);
90 static struct cache_detail svc_expkey_cache;
92 static int expkey_parse(struct cache_detail *cd, char *mesg, int mlen)
94 /* client fsidtype fsid [path] */
97 struct auth_domain *dom = NULL;
101 struct svc_expkey key;
102 struct svc_expkey *ek;
104 if (mesg[mlen-1] != '\n')
108 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
113 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
117 dom = auth_domain_find(buf);
120 dprintk("found domain %s\n", buf);
123 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
125 fsidtype = simple_strtoul(buf, &ep, 10);
128 dprintk("found fsidtype %d\n", fsidtype);
129 if (key_len(fsidtype)==0) /* invalid type */
131 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
133 dprintk("found fsid length %d\n", len);
134 if (len != key_len(fsidtype))
137 /* OK, we seem to have a valid key */
139 key.h.expiry_time = get_expiry(&mesg);
140 if (key.h.expiry_time == 0)
144 key.ek_fsidtype = fsidtype;
145 memcpy(key.ek_fsid, buf, len);
147 ek = svc_expkey_lookup(&key);
152 /* now we want a pathname, or empty meaning NEGATIVE */
154 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) < 0) {
155 cache_put(&ek->h, &svc_expkey_cache);
158 dprintk("Path seems to be <%s>\n", buf);
161 set_bit(CACHE_NEGATIVE, &key.h.flags);
162 ek = svc_expkey_update(&key, ek);
164 cache_put(&ek->h, &svc_expkey_cache);
168 err = path_lookup(buf, 0, &nd);
170 cache_put(&ek->h, &svc_expkey_cache);
174 dprintk("Found the path %s\n", buf);
175 key.ek_path = nd.path;
177 ek = svc_expkey_update(&key, ek);
179 cache_put(&ek->h, &svc_expkey_cache);
187 auth_domain_put(dom);
192 static int expkey_show(struct seq_file *m,
193 struct cache_detail *cd,
194 struct cache_head *h)
196 struct svc_expkey *ek ;
200 seq_puts(m, "#domain fsidtype fsid [path]\n");
203 ek = container_of(h, struct svc_expkey, h);
204 seq_printf(m, "%s %d 0x", ek->ek_client->name,
206 for (i=0; i < key_len(ek->ek_fsidtype)/4; i++)
207 seq_printf(m, "%08x", ek->ek_fsid[i]);
208 if (test_bit(CACHE_VALID, &h->flags) &&
209 !test_bit(CACHE_NEGATIVE, &h->flags)) {
211 seq_path(m, &ek->ek_path, "\\ \t\n");
217 static inline int expkey_match (struct cache_head *a, struct cache_head *b)
219 struct svc_expkey *orig = container_of(a, struct svc_expkey, h);
220 struct svc_expkey *new = container_of(b, struct svc_expkey, h);
222 if (orig->ek_fsidtype != new->ek_fsidtype ||
223 orig->ek_client != new->ek_client ||
224 memcmp(orig->ek_fsid, new->ek_fsid, key_len(orig->ek_fsidtype)) != 0)
229 static inline void expkey_init(struct cache_head *cnew,
230 struct cache_head *citem)
232 struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
233 struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
235 kref_get(&item->ek_client->ref);
236 new->ek_client = item->ek_client;
237 new->ek_fsidtype = item->ek_fsidtype;
239 memcpy(new->ek_fsid, item->ek_fsid, sizeof(new->ek_fsid));
242 static inline void expkey_update(struct cache_head *cnew,
243 struct cache_head *citem)
245 struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
246 struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
248 new->ek_path = item->ek_path;
249 path_get(&item->ek_path);
252 static struct cache_head *expkey_alloc(void)
254 struct svc_expkey *i = kmalloc(sizeof(*i), GFP_KERNEL);
261 static struct cache_detail svc_expkey_cache = {
262 .owner = THIS_MODULE,
263 .hash_size = EXPKEY_HASHMAX,
264 .hash_table = expkey_table,
266 .cache_put = expkey_put,
267 .cache_request = expkey_request,
268 .cache_parse = expkey_parse,
269 .cache_show = expkey_show,
270 .match = expkey_match,
272 .update = expkey_update,
273 .alloc = expkey_alloc,
276 static struct svc_expkey *
277 svc_expkey_lookup(struct svc_expkey *item)
279 struct cache_head *ch;
280 int hash = item->ek_fsidtype;
281 char * cp = (char*)item->ek_fsid;
282 int len = key_len(item->ek_fsidtype);
284 hash ^= hash_mem(cp, len, EXPKEY_HASHBITS);
285 hash ^= hash_ptr(item->ek_client, EXPKEY_HASHBITS);
286 hash &= EXPKEY_HASHMASK;
288 ch = sunrpc_cache_lookup(&svc_expkey_cache, &item->h,
291 return container_of(ch, struct svc_expkey, h);
296 static struct svc_expkey *
297 svc_expkey_update(struct svc_expkey *new, struct svc_expkey *old)
299 struct cache_head *ch;
300 int hash = new->ek_fsidtype;
301 char * cp = (char*)new->ek_fsid;
302 int len = key_len(new->ek_fsidtype);
304 hash ^= hash_mem(cp, len, EXPKEY_HASHBITS);
305 hash ^= hash_ptr(new->ek_client, EXPKEY_HASHBITS);
306 hash &= EXPKEY_HASHMASK;
308 ch = sunrpc_cache_update(&svc_expkey_cache, &new->h,
311 return container_of(ch, struct svc_expkey, h);
317 #define EXPORT_HASHBITS 8
318 #define EXPORT_HASHMAX (1<< EXPORT_HASHBITS)
319 #define EXPORT_HASHMASK (EXPORT_HASHMAX -1)
321 static struct cache_head *export_table[EXPORT_HASHMAX];
323 static void nfsd4_fslocs_free(struct nfsd4_fs_locations *fsloc)
327 for (i = 0; i < fsloc->locations_count; i++) {
328 kfree(fsloc->locations[i].path);
329 kfree(fsloc->locations[i].hosts);
331 kfree(fsloc->locations);
334 static void svc_export_put(struct kref *ref)
336 struct svc_export *exp = container_of(ref, struct svc_export, h.ref);
337 path_put(&exp->ex_path);
338 auth_domain_put(exp->ex_client);
339 kfree(exp->ex_pathname);
340 nfsd4_fslocs_free(&exp->ex_fslocs);
344 static void svc_export_request(struct cache_detail *cd,
345 struct cache_head *h,
346 char **bpp, int *blen)
349 struct svc_export *exp = container_of(h, struct svc_export, h);
352 qword_add(bpp, blen, exp->ex_client->name);
353 pth = d_path(&exp->ex_path, *bpp, *blen);
355 /* is this correct? */
359 qword_add(bpp, blen, pth);
363 static struct svc_export *svc_export_update(struct svc_export *new,
364 struct svc_export *old);
365 static struct svc_export *svc_export_lookup(struct svc_export *);
367 static int check_export(struct inode *inode, int flags, unsigned char *uuid)
370 /* We currently export only dirs and regular files.
371 * This is what umountd does.
373 if (!S_ISDIR(inode->i_mode) &&
374 !S_ISREG(inode->i_mode))
377 /* There are two requirements on a filesystem to be exportable.
378 * 1: We must be able to identify the filesystem from a number.
379 * either a device number (so FS_REQUIRES_DEV needed)
380 * or an FSID number (so NFSEXP_FSID or ->uuid is needed).
381 * 2: We must be able to find an inode from a filehandle.
382 * This means that s_export_op must be set.
384 if (!(inode->i_sb->s_type->fs_flags & FS_REQUIRES_DEV) &&
385 !(flags & NFSEXP_FSID) &&
387 dprintk("exp_export: export of non-dev fs without fsid\n");
391 if (!inode->i_sb->s_export_op ||
392 !inode->i_sb->s_export_op->fh_to_dentry) {
393 dprintk("exp_export: export of invalid fs type.\n");
401 #ifdef CONFIG_NFSD_V4
404 fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc)
407 int migrated, i, err;
410 err = get_int(mesg, &fsloc->locations_count);
413 if (fsloc->locations_count > MAX_FS_LOCATIONS)
415 if (fsloc->locations_count == 0)
418 fsloc->locations = kzalloc(fsloc->locations_count
419 * sizeof(struct nfsd4_fs_location), GFP_KERNEL);
420 if (!fsloc->locations)
422 for (i=0; i < fsloc->locations_count; i++) {
423 /* colon separated host list */
425 len = qword_get(mesg, buf, PAGE_SIZE);
429 fsloc->locations[i].hosts = kstrdup(buf, GFP_KERNEL);
430 if (!fsloc->locations[i].hosts)
433 /* slash separated path component list */
434 len = qword_get(mesg, buf, PAGE_SIZE);
438 fsloc->locations[i].path = kstrdup(buf, GFP_KERNEL);
439 if (!fsloc->locations[i].path)
443 err = get_int(mesg, &migrated);
447 if (migrated < 0 || migrated > 1)
449 fsloc->migrated = migrated;
452 nfsd4_fslocs_free(fsloc);
456 static int secinfo_parse(char **mesg, char *buf, struct svc_export *exp)
459 struct exp_flavor_info *f;
461 err = get_int(mesg, &listsize);
464 if (listsize < 0 || listsize > MAX_SECINFO_LIST)
467 for (f = exp->ex_flavors; f < exp->ex_flavors + listsize; f++) {
468 err = get_int(mesg, &f->pseudoflavor);
472 * Just a quick sanity check; we could also try to check
473 * whether this pseudoflavor is supported, but at worst
474 * an unsupported pseudoflavor on the export would just
475 * be a pseudoflavor that won't match the flavor of any
476 * authenticated request. The administrator will
477 * probably discover the problem when someone fails to
480 if (f->pseudoflavor < 0)
482 err = get_int(mesg, &f->flags);
485 /* Only some flags are allowed to differ between flavors: */
486 if (~NFSEXP_SECINFO_FLAGS & (f->flags ^ exp->ex_flags))
489 exp->ex_nflavors = listsize;
493 #else /* CONFIG_NFSD_V4 */
495 fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc){return 0;}
497 secinfo_parse(char **mesg, char *buf, struct svc_export *exp) { return 0; }
500 static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen)
502 /* client path expiry [flags anonuid anongid fsid] */
506 struct auth_domain *dom = NULL;
508 struct svc_export exp, *expp;
511 nd.path.dentry = NULL;
512 exp.ex_pathname = NULL;
515 exp.ex_fslocs.locations = NULL;
516 exp.ex_fslocs.locations_count = 0;
517 exp.ex_fslocs.migrated = 0;
524 if (mesg[mlen-1] != '\n')
528 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
533 len = qword_get(&mesg, buf, PAGE_SIZE);
535 if (len <= 0) goto out;
538 dom = auth_domain_find(buf);
544 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
546 err = path_lookup(buf, 0, &nd);
547 if (err) goto out_no_path;
551 exp.ex_path.mnt = nd.path.mnt;
552 exp.ex_path.dentry = nd.path.dentry;
553 exp.ex_pathname = kstrdup(buf, GFP_KERNEL);
555 if (!exp.ex_pathname)
560 exp.h.expiry_time = get_expiry(&mesg);
561 if (exp.h.expiry_time == 0)
565 err = get_int(&mesg, &an_int);
566 if (err == -ENOENT) {
568 set_bit(CACHE_NEGATIVE, &exp.h.flags);
570 if (err || an_int < 0) goto out;
571 exp.ex_flags= an_int;
574 err = get_int(&mesg, &an_int);
576 exp.ex_anon_uid= an_int;
579 err = get_int(&mesg, &an_int);
581 exp.ex_anon_gid= an_int;
584 err = get_int(&mesg, &an_int);
586 exp.ex_fsid = an_int;
588 while ((len = qword_get(&mesg, buf, PAGE_SIZE)) > 0) {
589 if (strcmp(buf, "fsloc") == 0)
590 err = fsloc_parse(&mesg, buf, &exp.ex_fslocs);
591 else if (strcmp(buf, "uuid") == 0) {
592 /* expect a 16 byte uuid encoded as \xXXXX... */
593 len = qword_get(&mesg, buf, PAGE_SIZE);
598 kmemdup(buf, 16, GFP_KERNEL);
599 if (exp.ex_uuid == NULL)
602 } else if (strcmp(buf, "secinfo") == 0)
603 err = secinfo_parse(&mesg, buf, &exp);
605 /* quietly ignore unknown words and anything
606 * following. Newer user-space can try to set
607 * new values, then see what the result was.
614 err = check_export(nd.path.dentry->d_inode, exp.ex_flags,
619 expp = svc_export_lookup(&exp);
621 expp = svc_export_update(&exp, expp);
630 nfsd4_fslocs_free(&exp.ex_fslocs);
632 kfree(exp.ex_pathname);
637 auth_domain_put(dom);
642 static void exp_flags(struct seq_file *m, int flag, int fsid,
643 uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fslocs);
644 static void show_secinfo(struct seq_file *m, struct svc_export *exp);
646 static int svc_export_show(struct seq_file *m,
647 struct cache_detail *cd,
648 struct cache_head *h)
650 struct svc_export *exp ;
653 seq_puts(m, "#path domain(flags)\n");
656 exp = container_of(h, struct svc_export, h);
657 seq_path(m, &exp->ex_path, " \t\n\\");
659 seq_escape(m, exp->ex_client->name, " \t\n\\");
661 if (test_bit(CACHE_VALID, &h->flags) &&
662 !test_bit(CACHE_NEGATIVE, &h->flags)) {
663 exp_flags(m, exp->ex_flags, exp->ex_fsid,
664 exp->ex_anon_uid, exp->ex_anon_gid, &exp->ex_fslocs);
667 seq_puts(m, ",uuid=");
668 for (i=0; i<16; i++) {
671 seq_printf(m, "%02x", exp->ex_uuid[i]);
674 show_secinfo(m, exp);
679 static int svc_export_match(struct cache_head *a, struct cache_head *b)
681 struct svc_export *orig = container_of(a, struct svc_export, h);
682 struct svc_export *new = container_of(b, struct svc_export, h);
683 return orig->ex_client == new->ex_client &&
684 orig->ex_path.dentry == new->ex_path.dentry &&
685 orig->ex_path.mnt == new->ex_path.mnt;
688 static void svc_export_init(struct cache_head *cnew, struct cache_head *citem)
690 struct svc_export *new = container_of(cnew, struct svc_export, h);
691 struct svc_export *item = container_of(citem, struct svc_export, h);
693 kref_get(&item->ex_client->ref);
694 new->ex_client = item->ex_client;
695 new->ex_path.dentry = dget(item->ex_path.dentry);
696 new->ex_path.mnt = mntget(item->ex_path.mnt);
697 new->ex_pathname = NULL;
698 new->ex_fslocs.locations = NULL;
699 new->ex_fslocs.locations_count = 0;
700 new->ex_fslocs.migrated = 0;
703 static void export_update(struct cache_head *cnew, struct cache_head *citem)
705 struct svc_export *new = container_of(cnew, struct svc_export, h);
706 struct svc_export *item = container_of(citem, struct svc_export, h);
709 new->ex_flags = item->ex_flags;
710 new->ex_anon_uid = item->ex_anon_uid;
711 new->ex_anon_gid = item->ex_anon_gid;
712 new->ex_fsid = item->ex_fsid;
713 new->ex_uuid = item->ex_uuid;
714 item->ex_uuid = NULL;
715 new->ex_pathname = item->ex_pathname;
716 item->ex_pathname = NULL;
717 new->ex_fslocs.locations = item->ex_fslocs.locations;
718 item->ex_fslocs.locations = NULL;
719 new->ex_fslocs.locations_count = item->ex_fslocs.locations_count;
720 item->ex_fslocs.locations_count = 0;
721 new->ex_fslocs.migrated = item->ex_fslocs.migrated;
722 item->ex_fslocs.migrated = 0;
723 new->ex_nflavors = item->ex_nflavors;
724 for (i = 0; i < MAX_SECINFO_LIST; i++) {
725 new->ex_flavors[i] = item->ex_flavors[i];
729 static struct cache_head *svc_export_alloc(void)
731 struct svc_export *i = kmalloc(sizeof(*i), GFP_KERNEL);
738 struct cache_detail svc_export_cache = {
739 .owner = THIS_MODULE,
740 .hash_size = EXPORT_HASHMAX,
741 .hash_table = export_table,
742 .name = "nfsd.export",
743 .cache_put = svc_export_put,
744 .cache_request = svc_export_request,
745 .cache_parse = svc_export_parse,
746 .cache_show = svc_export_show,
747 .match = svc_export_match,
748 .init = svc_export_init,
749 .update = export_update,
750 .alloc = svc_export_alloc,
753 static struct svc_export *
754 svc_export_lookup(struct svc_export *exp)
756 struct cache_head *ch;
758 hash = hash_ptr(exp->ex_client, EXPORT_HASHBITS);
759 hash ^= hash_ptr(exp->ex_path.dentry, EXPORT_HASHBITS);
760 hash ^= hash_ptr(exp->ex_path.mnt, EXPORT_HASHBITS);
762 ch = sunrpc_cache_lookup(&svc_export_cache, &exp->h,
765 return container_of(ch, struct svc_export, h);
770 static struct svc_export *
771 svc_export_update(struct svc_export *new, struct svc_export *old)
773 struct cache_head *ch;
775 hash = hash_ptr(old->ex_client, EXPORT_HASHBITS);
776 hash ^= hash_ptr(old->ex_path.dentry, EXPORT_HASHBITS);
777 hash ^= hash_ptr(old->ex_path.mnt, EXPORT_HASHBITS);
779 ch = sunrpc_cache_update(&svc_export_cache, &new->h,
783 return container_of(ch, struct svc_export, h);
789 static struct svc_expkey *
790 exp_find_key(svc_client *clp, int fsid_type, u32 *fsidv, struct cache_req *reqp)
792 struct svc_expkey key, *ek;
796 return ERR_PTR(-ENOENT);
799 key.ek_fsidtype = fsid_type;
800 memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
802 ek = svc_expkey_lookup(&key);
804 return ERR_PTR(-ENOMEM);
805 err = cache_check(&svc_expkey_cache, &ek->h, reqp);
811 static int exp_set_key(svc_client *clp, int fsid_type, u32 *fsidv,
812 struct svc_export *exp)
814 struct svc_expkey key, *ek;
817 key.ek_fsidtype = fsid_type;
818 memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
819 key.ek_path = exp->ex_path;
820 key.h.expiry_time = NEVER;
823 ek = svc_expkey_lookup(&key);
825 ek = svc_expkey_update(&key,ek);
827 cache_put(&ek->h, &svc_expkey_cache);
834 * Find the client's export entry matching xdev/xino.
836 static inline struct svc_expkey *
837 exp_get_key(svc_client *clp, dev_t dev, ino_t ino)
841 if (old_valid_dev(dev)) {
842 mk_fsid(FSID_DEV, fsidv, dev, ino, 0, NULL);
843 return exp_find_key(clp, FSID_DEV, fsidv, NULL);
845 mk_fsid(FSID_ENCODE_DEV, fsidv, dev, ino, 0, NULL);
846 return exp_find_key(clp, FSID_ENCODE_DEV, fsidv, NULL);
850 * Find the client's export entry matching fsid
852 static inline struct svc_expkey *
853 exp_get_fsid_key(svc_client *clp, int fsid)
857 mk_fsid(FSID_NUM, fsidv, 0, 0, fsid, NULL);
859 return exp_find_key(clp, FSID_NUM, fsidv, NULL);
862 static svc_export *exp_get_by_name(svc_client *clp, struct vfsmount *mnt,
863 struct dentry *dentry,
864 struct cache_req *reqp)
866 struct svc_export *exp, key;
870 return ERR_PTR(-ENOENT);
873 key.ex_path.mnt = mnt;
874 key.ex_path.dentry = dentry;
876 exp = svc_export_lookup(&key);
878 return ERR_PTR(-ENOMEM);
879 err = cache_check(&svc_export_cache, &exp->h, reqp);
886 * Find the export entry for a given dentry.
888 static struct svc_export *exp_parent(svc_client *clp, struct vfsmount *mnt,
889 struct dentry *dentry,
890 struct cache_req *reqp)
895 exp = exp_get_by_name(clp, mnt, dentry, reqp);
897 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(dentry)) {
898 struct dentry *parent;
900 parent = dget_parent(dentry);
903 exp = exp_get_by_name(clp, mnt, dentry, reqp);
910 * Hashtable locking. Write locks are placed only by user processes
911 * wanting to modify export information.
912 * Write locking only done in this file. Read locking
916 static DECLARE_RWSEM(hash_sem);
921 down_read(&hash_sem);
927 down_write(&hash_sem);
937 exp_writeunlock(void)
942 static void exp_fsid_unhash(struct svc_export *exp)
944 struct svc_expkey *ek;
946 if ((exp->ex_flags & NFSEXP_FSID) == 0)
949 ek = exp_get_fsid_key(exp->ex_client, exp->ex_fsid);
951 ek->h.expiry_time = get_seconds()-1;
952 cache_put(&ek->h, &svc_expkey_cache);
954 svc_expkey_cache.nextcheck = get_seconds();
957 static int exp_fsid_hash(svc_client *clp, struct svc_export *exp)
961 if ((exp->ex_flags & NFSEXP_FSID) == 0)
964 mk_fsid(FSID_NUM, fsid, 0, 0, exp->ex_fsid, NULL);
965 return exp_set_key(clp, FSID_NUM, fsid, exp);
968 static int exp_hash(struct auth_domain *clp, struct svc_export *exp)
971 struct inode *inode = exp->ex_path.dentry->d_inode;
972 dev_t dev = inode->i_sb->s_dev;
974 if (old_valid_dev(dev)) {
975 mk_fsid(FSID_DEV, fsid, dev, inode->i_ino, 0, NULL);
976 return exp_set_key(clp, FSID_DEV, fsid, exp);
978 mk_fsid(FSID_ENCODE_DEV, fsid, dev, inode->i_ino, 0, NULL);
979 return exp_set_key(clp, FSID_ENCODE_DEV, fsid, exp);
982 static void exp_unhash(struct svc_export *exp)
984 struct svc_expkey *ek;
985 struct inode *inode = exp->ex_path.dentry->d_inode;
987 ek = exp_get_key(exp->ex_client, inode->i_sb->s_dev, inode->i_ino);
989 ek->h.expiry_time = get_seconds()-1;
990 cache_put(&ek->h, &svc_expkey_cache);
992 svc_expkey_cache.nextcheck = get_seconds();
996 * Export a file system.
999 exp_export(struct nfsctl_export *nxp)
1002 struct svc_export *exp = NULL;
1003 struct svc_export new;
1004 struct svc_expkey *fsid_key = NULL;
1005 struct nameidata nd;
1008 /* Consistency check */
1010 if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) ||
1011 !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX))
1014 dprintk("exp_export called for %s:%s (%x/%ld fl %x).\n",
1015 nxp->ex_client, nxp->ex_path,
1016 (unsigned)nxp->ex_dev, (long)nxp->ex_ino,
1019 /* Try to lock the export table for update */
1022 /* Look up client info */
1023 if (!(clp = auth_domain_find(nxp->ex_client)))
1027 /* Look up the dentry */
1028 err = path_lookup(nxp->ex_path, 0, &nd);
1033 exp = exp_get_by_name(clp, nd.path.mnt, nd.path.dentry, NULL);
1035 memset(&new, 0, sizeof(new));
1037 /* must make sure there won't be an ex_fsid clash */
1038 if ((nxp->ex_flags & NFSEXP_FSID) &&
1039 (!IS_ERR(fsid_key = exp_get_fsid_key(clp, nxp->ex_dev))) &&
1040 fsid_key->ek_path.mnt &&
1041 (fsid_key->ek_path.mnt != nd.path.mnt ||
1042 fsid_key->ek_path.dentry != nd.path.dentry))
1046 /* just a flags/id/fsid update */
1048 exp_fsid_unhash(exp);
1049 exp->ex_flags = nxp->ex_flags;
1050 exp->ex_anon_uid = nxp->ex_anon_uid;
1051 exp->ex_anon_gid = nxp->ex_anon_gid;
1052 exp->ex_fsid = nxp->ex_dev;
1054 err = exp_fsid_hash(clp, exp);
1058 err = check_export(nd.path.dentry->d_inode, nxp->ex_flags, NULL);
1059 if (err) goto finish;
1063 dprintk("nfsd: creating export entry %p for client %p\n", exp, clp);
1065 new.h.expiry_time = NEVER;
1067 new.ex_pathname = kstrdup(nxp->ex_path, GFP_KERNEL);
1068 if (!new.ex_pathname)
1070 new.ex_client = clp;
1071 new.ex_path = nd.path;
1072 new.ex_flags = nxp->ex_flags;
1073 new.ex_anon_uid = nxp->ex_anon_uid;
1074 new.ex_anon_gid = nxp->ex_anon_gid;
1075 new.ex_fsid = nxp->ex_dev;
1077 exp = svc_export_lookup(&new);
1079 exp = svc_export_update(&new, exp);
1084 if (exp_hash(clp, exp) ||
1085 exp_fsid_hash(clp, exp)) {
1086 /* failed to create at least one index */
1087 exp_do_unexport(exp);
1092 kfree(new.ex_pathname);
1095 if (fsid_key && !IS_ERR(fsid_key))
1096 cache_put(&fsid_key->h, &svc_expkey_cache);
1099 auth_domain_put(clp);
1107 * Unexport a file system. The export entry has already
1108 * been removed from the client's list of exported fs's.
1111 exp_do_unexport(svc_export *unexp)
1113 unexp->h.expiry_time = get_seconds()-1;
1114 svc_export_cache.nextcheck = get_seconds();
1116 exp_fsid_unhash(unexp);
1124 exp_unexport(struct nfsctl_export *nxp)
1126 struct auth_domain *dom;
1128 struct nameidata nd;
1131 /* Consistency check */
1132 if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) ||
1133 !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX))
1139 dom = auth_domain_find(nxp->ex_client);
1141 dprintk("nfsd: unexport couldn't find %s\n", nxp->ex_client);
1145 err = path_lookup(nxp->ex_path, 0, &nd);
1150 exp = exp_get_by_name(dom, nd.path.mnt, nd.path.dentry, NULL);
1155 exp_do_unexport(exp);
1160 auth_domain_put(dom);
1168 * Obtain the root fh on behalf of a client.
1169 * This could be done in user space, but I feel that it adds some safety
1170 * since its harder to fool a kernel module than a user space program.
1173 exp_rootfh(svc_client *clp, char *path, struct knfsd_fh *f, int maxsize)
1175 struct svc_export *exp;
1176 struct nameidata nd;
1177 struct inode *inode;
1182 /* NB: we probably ought to check that it's NUL-terminated */
1183 if (path_lookup(path, 0, &nd)) {
1184 printk("nfsd: exp_rootfh path not found %s", path);
1187 inode = nd.path.dentry->d_inode;
1189 dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n",
1190 path, nd.path.dentry, clp->name,
1191 inode->i_sb->s_id, inode->i_ino);
1192 exp = exp_parent(clp, nd.path.mnt, nd.path.dentry, NULL);
1199 * fh must be initialized before calling fh_compose
1201 fh_init(&fh, maxsize);
1202 if (fh_compose(&fh, exp, nd.path.dentry, NULL))
1206 memcpy(f, &fh.fh_handle, sizeof(struct knfsd_fh));
1214 static struct svc_export *exp_find(struct auth_domain *clp, int fsid_type,
1215 u32 *fsidv, struct cache_req *reqp)
1217 struct svc_export *exp;
1218 struct svc_expkey *ek = exp_find_key(clp, fsid_type, fsidv, reqp);
1220 return ERR_CAST(ek);
1222 exp = exp_get_by_name(clp, ek->ek_path.mnt, ek->ek_path.dentry, reqp);
1223 cache_put(&ek->h, &svc_expkey_cache);
1226 return ERR_CAST(exp);
1230 __be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp)
1232 struct exp_flavor_info *f;
1233 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
1235 /* legacy gss-only clients are always OK: */
1236 if (exp->ex_client == rqstp->rq_gssclient)
1238 /* ip-address based client; check sec= export option: */
1239 for (f = exp->ex_flavors; f < end; f++) {
1240 if (f->pseudoflavor == rqstp->rq_flavor)
1243 /* defaults in absence of sec= options: */
1244 if (exp->ex_nflavors == 0) {
1245 if (rqstp->rq_flavor == RPC_AUTH_NULL ||
1246 rqstp->rq_flavor == RPC_AUTH_UNIX)
1249 return nfserr_wrongsec;
1253 * Uses rq_client and rq_gssclient to find an export; uses rq_client (an
1254 * auth_unix client) if it's available and has secinfo information;
1255 * otherwise, will try to use rq_gssclient.
1257 * Called from functions that handle requests; functions that do work on
1258 * behalf of mountd are passed a single client name to use, and should
1259 * use exp_get_by_name() or exp_find().
1262 rqst_exp_get_by_name(struct svc_rqst *rqstp, struct vfsmount *mnt,
1263 struct dentry *dentry)
1265 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
1267 if (rqstp->rq_client == NULL)
1270 /* First try the auth_unix client: */
1271 exp = exp_get_by_name(rqstp->rq_client, mnt, dentry,
1272 &rqstp->rq_chandle);
1273 if (PTR_ERR(exp) == -ENOENT)
1277 /* If it has secinfo, assume there are no gss/... clients */
1278 if (exp->ex_nflavors > 0)
1281 /* Otherwise, try falling back on gss client */
1282 if (rqstp->rq_gssclient == NULL)
1284 gssexp = exp_get_by_name(rqstp->rq_gssclient, mnt, dentry,
1285 &rqstp->rq_chandle);
1286 if (PTR_ERR(gssexp) == -ENOENT)
1294 rqst_exp_find(struct svc_rqst *rqstp, int fsid_type, u32 *fsidv)
1296 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
1298 if (rqstp->rq_client == NULL)
1301 /* First try the auth_unix client: */
1302 exp = exp_find(rqstp->rq_client, fsid_type, fsidv, &rqstp->rq_chandle);
1303 if (PTR_ERR(exp) == -ENOENT)
1307 /* If it has secinfo, assume there are no gss/... clients */
1308 if (exp->ex_nflavors > 0)
1311 /* Otherwise, try falling back on gss client */
1312 if (rqstp->rq_gssclient == NULL)
1314 gssexp = exp_find(rqstp->rq_gssclient, fsid_type, fsidv,
1315 &rqstp->rq_chandle);
1316 if (PTR_ERR(gssexp) == -ENOENT)
1324 rqst_exp_parent(struct svc_rqst *rqstp, struct vfsmount *mnt,
1325 struct dentry *dentry)
1327 struct svc_export *exp;
1330 exp = rqst_exp_get_by_name(rqstp, mnt, dentry);
1332 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(dentry)) {
1333 struct dentry *parent;
1335 parent = dget_parent(dentry);
1338 exp = rqst_exp_get_by_name(rqstp, mnt, dentry);
1345 * Called when we need the filehandle for the root of the pseudofs,
1346 * for a given NFSv4 client. The root is defined to be the
1347 * export point with fsid==0
1350 exp_pseudoroot(struct svc_rqst *rqstp, struct svc_fh *fhp)
1352 struct svc_export *exp;
1356 mk_fsid(FSID_NUM, fsidv, 0, 0, 0, NULL);
1358 exp = rqst_exp_find(rqstp, FSID_NUM, fsidv);
1360 return nfserrno(PTR_ERR(exp));
1361 rv = fh_compose(fhp, exp, exp->ex_path.dentry, NULL);
1364 rv = check_nfsd_access(exp, rqstp);
1372 static void *e_start(struct seq_file *m, loff_t *pos)
1373 __acquires(svc_export_cache.hash_lock)
1376 unsigned hash, export;
1377 struct cache_head *ch;
1380 read_lock(&svc_export_cache.hash_lock);
1382 return SEQ_START_TOKEN;
1384 export = n & ((1LL<<32) - 1);
1387 for (ch=export_table[hash]; ch; ch=ch->next)
1390 n &= ~((1LL<<32) - 1);
1394 } while(hash < EXPORT_HASHMAX && export_table[hash]==NULL);
1395 if (hash >= EXPORT_HASHMAX)
1398 return export_table[hash];
1401 static void *e_next(struct seq_file *m, void *p, loff_t *pos)
1403 struct cache_head *ch = p;
1404 int hash = (*pos >> 32);
1406 if (p == SEQ_START_TOKEN)
1408 else if (ch->next == NULL) {
1415 *pos &= ~((1LL<<32) - 1);
1416 while (hash < EXPORT_HASHMAX && export_table[hash] == NULL) {
1420 if (hash >= EXPORT_HASHMAX)
1423 return export_table[hash];
1426 static void e_stop(struct seq_file *m, void *p)
1427 __releases(svc_export_cache.hash_lock)
1429 read_unlock(&svc_export_cache.hash_lock);
1433 static struct flags {
1437 { NFSEXP_READONLY, {"ro", "rw"}},
1438 { NFSEXP_INSECURE_PORT, {"insecure", ""}},
1439 { NFSEXP_ROOTSQUASH, {"root_squash", "no_root_squash"}},
1440 { NFSEXP_ALLSQUASH, {"all_squash", ""}},
1441 { NFSEXP_ASYNC, {"async", "sync"}},
1442 { NFSEXP_GATHERED_WRITES, {"wdelay", "no_wdelay"}},
1443 { NFSEXP_NOHIDE, {"nohide", ""}},
1444 { NFSEXP_CROSSMOUNT, {"crossmnt", ""}},
1445 { NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}},
1446 { NFSEXP_NOAUTHNLM, {"insecure_locks", ""}},
1448 { NFSEXP_MSNFS, {"msnfs", ""}},
1453 static void show_expflags(struct seq_file *m, int flags, int mask)
1456 int state, first = 0;
1458 for (flg = expflags; flg->flag; flg++) {
1459 if (flg->flag & ~mask)
1461 state = (flg->flag & flags) ? 0 : 1;
1462 if (*flg->name[state])
1463 seq_printf(m, "%s%s", first++?",":"", flg->name[state]);
1467 static void show_secinfo_flags(struct seq_file *m, int flags)
1470 show_expflags(m, flags, NFSEXP_SECINFO_FLAGS);
1473 static void show_secinfo(struct seq_file *m, struct svc_export *exp)
1475 struct exp_flavor_info *f;
1476 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
1477 int lastflags = 0, first = 0;
1479 if (exp->ex_nflavors == 0)
1481 for (f = exp->ex_flavors; f < end; f++) {
1482 if (first || f->flags != lastflags) {
1484 show_secinfo_flags(m, lastflags);
1485 seq_printf(m, ",sec=%d", f->pseudoflavor);
1486 lastflags = f->flags;
1488 seq_printf(m, ":%d", f->pseudoflavor);
1491 show_secinfo_flags(m, lastflags);
1494 static void exp_flags(struct seq_file *m, int flag, int fsid,
1495 uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fsloc)
1497 show_expflags(m, flag, NFSEXP_ALLFLAGS);
1498 if (flag & NFSEXP_FSID)
1499 seq_printf(m, ",fsid=%d", fsid);
1500 if (anonu != (uid_t)-2 && anonu != (0x10000-2))
1501 seq_printf(m, ",anonuid=%u", anonu);
1502 if (anong != (gid_t)-2 && anong != (0x10000-2))
1503 seq_printf(m, ",anongid=%u", anong);
1504 if (fsloc && fsloc->locations_count > 0) {
1505 char *loctype = (fsloc->migrated) ? "refer" : "replicas";
1508 seq_printf(m, ",%s=", loctype);
1509 seq_escape(m, fsloc->locations[0].path, ",;@ \t\n\\");
1511 seq_escape(m, fsloc->locations[0].hosts, ",;@ \t\n\\");
1512 for (i = 1; i < fsloc->locations_count; i++) {
1514 seq_escape(m, fsloc->locations[i].path, ",;@ \t\n\\");
1516 seq_escape(m, fsloc->locations[i].hosts, ",;@ \t\n\\");
1521 static int e_show(struct seq_file *m, void *p)
1523 struct cache_head *cp = p;
1524 struct svc_export *exp = container_of(cp, struct svc_export, h);
1526 if (p == SEQ_START_TOKEN) {
1527 seq_puts(m, "# Version 1.1\n");
1528 seq_puts(m, "# Path Client(Flags) # IPs\n");
1533 if (cache_check(&svc_export_cache, &exp->h, NULL))
1535 cache_put(&exp->h, &svc_export_cache);
1536 return svc_export_show(m, &svc_export_cache, cp);
1539 struct seq_operations nfs_exports_op = {
1547 * Add or modify a client.
1548 * Change requests may involve the list of host addresses. The list of
1549 * exports and possibly existing uid maps are left untouched.
1552 exp_addclient(struct nfsctl_client *ncp)
1554 struct auth_domain *dom;
1556 struct in6_addr addr6;
1558 /* First, consistency check. */
1560 if (! exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX))
1562 if (ncp->cl_naddr > NFSCLNT_ADDRMAX)
1565 /* Lock the hashtable */
1568 dom = unix_domain_find(ncp->cl_ident);
1574 /* Insert client into hashtable. */
1575 for (i = 0; i < ncp->cl_naddr; i++) {
1576 ipv6_addr_set_v4mapped(ncp->cl_addrlist[i].s_addr, &addr6);
1577 auth_unix_add_addr(&addr6, dom);
1579 auth_unix_forget_old(dom);
1580 auth_domain_put(dom);
1591 * Delete a client given an identifier.
1594 exp_delclient(struct nfsctl_client *ncp)
1597 struct auth_domain *dom;
1600 if (!exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX))
1603 /* Lock the hashtable */
1606 dom = auth_domain_find(ncp->cl_ident);
1607 /* just make sure that no addresses work
1608 * and that it will expire soon
1611 err = auth_unix_forget_old(dom);
1612 auth_domain_put(dom);
1621 * Verify that string is non-empty and does not exceed max length.
1624 exp_verify_string(char *cp, int max)
1628 for (i = 0; i < max; i++)
1632 printk(KERN_NOTICE "nfsd: couldn't validate string %s\n", cp);
1637 * Initialize the exports module.
1640 nfsd_export_init(void)
1643 dprintk("nfsd: initializing export module.\n");
1645 rv = cache_register(&svc_export_cache);
1648 rv = cache_register(&svc_expkey_cache);
1650 cache_unregister(&svc_export_cache);
1656 * Flush exports table - called when last nfsd thread is killed
1659 nfsd_export_flush(void)
1662 cache_purge(&svc_expkey_cache);
1663 cache_purge(&svc_export_cache);
1668 * Shutdown the exports module.
1671 nfsd_export_shutdown(void)
1674 dprintk("nfsd: shutting down export module.\n");
1678 cache_unregister(&svc_expkey_cache);
1679 cache_unregister(&svc_export_cache);
1680 svcauth_unix_purge();
1683 dprintk("nfsd: export shutdown complete.\n");