1 #define MSNFS /* HACK HACK */
3 * NFS exporting and validation.
5 * We maintain a list of clients, each of which has a list of
6 * exports. To export an fs to a given client, you first have
7 * to create the client entry with NFSCTL_ADDCLIENT, which
8 * creates a client control block and adds it to the hash
9 * table. Then, you call NFSCTL_EXPORT for each fs.
12 * Copyright (C) 1995, 1996 Olaf Kirch, <okir@monad.swb.de>
15 #include <linux/slab.h>
16 #include <linux/namei.h>
17 #include <linux/module.h>
18 #include <linux/exportfs.h>
20 #include <linux/nfsd/syscall.h>
26 #define NFSDDBG_FACILITY NFSDDBG_EXPORT
28 typedef struct auth_domain svc_client;
29 typedef struct svc_export svc_export;
31 static void exp_do_unexport(svc_export *unexp);
32 static int exp_verify_string(char *cp, int max);
36 * One maps client+vfsmnt+dentry to export options - the export map
37 * The other maps client+filehandle-fragment to export options. - the expkey map
39 * The export options are actually stored in the first map, and the
40 * second map contains a reference to the entry in the first map.
43 #define EXPKEY_HASHBITS 8
44 #define EXPKEY_HASHMAX (1 << EXPKEY_HASHBITS)
45 #define EXPKEY_HASHMASK (EXPKEY_HASHMAX -1)
46 static struct cache_head *expkey_table[EXPKEY_HASHMAX];
48 static void expkey_put(struct kref *ref)
50 struct svc_expkey *key = container_of(ref, struct svc_expkey, h.ref);
52 if (test_bit(CACHE_VALID, &key->h.flags) &&
53 !test_bit(CACHE_NEGATIVE, &key->h.flags))
54 path_put(&key->ek_path);
55 auth_domain_put(key->ek_client);
59 static void expkey_request(struct cache_detail *cd,
61 char **bpp, int *blen)
63 /* client fsidtype \xfsid */
64 struct svc_expkey *ek = container_of(h, struct svc_expkey, h);
67 qword_add(bpp, blen, ek->ek_client->name);
68 snprintf(type, 5, "%d", ek->ek_fsidtype);
69 qword_add(bpp, blen, type);
70 qword_addhex(bpp, blen, (char*)ek->ek_fsid, key_len(ek->ek_fsidtype));
74 static int expkey_upcall(struct cache_detail *cd, struct cache_head *h)
76 return sunrpc_cache_pipe_upcall(cd, h, expkey_request);
79 static struct svc_expkey *svc_expkey_update(struct svc_expkey *new, struct svc_expkey *old);
80 static struct svc_expkey *svc_expkey_lookup(struct svc_expkey *);
81 static struct cache_detail svc_expkey_cache;
83 static int expkey_parse(struct cache_detail *cd, char *mesg, int mlen)
85 /* client fsidtype fsid [path] */
88 struct auth_domain *dom = NULL;
92 struct svc_expkey key;
93 struct svc_expkey *ek = NULL;
95 if (mesg[mlen-1] != '\n')
99 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
105 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
109 dom = auth_domain_find(buf);
112 dprintk("found domain %s\n", buf);
115 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
117 fsidtype = simple_strtoul(buf, &ep, 10);
120 dprintk("found fsidtype %d\n", fsidtype);
121 if (key_len(fsidtype)==0) /* invalid type */
123 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
125 dprintk("found fsid length %d\n", len);
126 if (len != key_len(fsidtype))
129 /* OK, we seem to have a valid key */
131 key.h.expiry_time = get_expiry(&mesg);
132 if (key.h.expiry_time == 0)
136 key.ek_fsidtype = fsidtype;
137 memcpy(key.ek_fsid, buf, len);
139 ek = svc_expkey_lookup(&key);
144 /* now we want a pathname, or empty meaning NEGATIVE */
146 len = qword_get(&mesg, buf, PAGE_SIZE);
149 dprintk("Path seems to be <%s>\n", buf);
152 set_bit(CACHE_NEGATIVE, &key.h.flags);
153 ek = svc_expkey_update(&key, ek);
157 err = kern_path(buf, 0, &key.ek_path);
161 dprintk("Found the path %s\n", buf);
163 ek = svc_expkey_update(&key, ek);
166 path_put(&key.ek_path);
171 cache_put(&ek->h, &svc_expkey_cache);
173 auth_domain_put(dom);
178 static int expkey_show(struct seq_file *m,
179 struct cache_detail *cd,
180 struct cache_head *h)
182 struct svc_expkey *ek ;
186 seq_puts(m, "#domain fsidtype fsid [path]\n");
189 ek = container_of(h, struct svc_expkey, h);
190 seq_printf(m, "%s %d 0x", ek->ek_client->name,
192 for (i=0; i < key_len(ek->ek_fsidtype)/4; i++)
193 seq_printf(m, "%08x", ek->ek_fsid[i]);
194 if (test_bit(CACHE_VALID, &h->flags) &&
195 !test_bit(CACHE_NEGATIVE, &h->flags)) {
197 seq_path(m, &ek->ek_path, "\\ \t\n");
203 static inline int expkey_match (struct cache_head *a, struct cache_head *b)
205 struct svc_expkey *orig = container_of(a, struct svc_expkey, h);
206 struct svc_expkey *new = container_of(b, struct svc_expkey, h);
208 if (orig->ek_fsidtype != new->ek_fsidtype ||
209 orig->ek_client != new->ek_client ||
210 memcmp(orig->ek_fsid, new->ek_fsid, key_len(orig->ek_fsidtype)) != 0)
215 static inline void expkey_init(struct cache_head *cnew,
216 struct cache_head *citem)
218 struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
219 struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
221 kref_get(&item->ek_client->ref);
222 new->ek_client = item->ek_client;
223 new->ek_fsidtype = item->ek_fsidtype;
225 memcpy(new->ek_fsid, item->ek_fsid, sizeof(new->ek_fsid));
228 static inline void expkey_update(struct cache_head *cnew,
229 struct cache_head *citem)
231 struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
232 struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
234 new->ek_path = item->ek_path;
235 path_get(&item->ek_path);
238 static struct cache_head *expkey_alloc(void)
240 struct svc_expkey *i = kmalloc(sizeof(*i), GFP_KERNEL);
247 static struct cache_detail svc_expkey_cache = {
248 .owner = THIS_MODULE,
249 .hash_size = EXPKEY_HASHMAX,
250 .hash_table = expkey_table,
252 .cache_put = expkey_put,
253 .cache_upcall = expkey_upcall,
254 .cache_parse = expkey_parse,
255 .cache_show = expkey_show,
256 .match = expkey_match,
258 .update = expkey_update,
259 .alloc = expkey_alloc,
262 static struct svc_expkey *
263 svc_expkey_lookup(struct svc_expkey *item)
265 struct cache_head *ch;
266 int hash = item->ek_fsidtype;
267 char * cp = (char*)item->ek_fsid;
268 int len = key_len(item->ek_fsidtype);
270 hash ^= hash_mem(cp, len, EXPKEY_HASHBITS);
271 hash ^= hash_ptr(item->ek_client, EXPKEY_HASHBITS);
272 hash &= EXPKEY_HASHMASK;
274 ch = sunrpc_cache_lookup(&svc_expkey_cache, &item->h,
277 return container_of(ch, struct svc_expkey, h);
282 static struct svc_expkey *
283 svc_expkey_update(struct svc_expkey *new, struct svc_expkey *old)
285 struct cache_head *ch;
286 int hash = new->ek_fsidtype;
287 char * cp = (char*)new->ek_fsid;
288 int len = key_len(new->ek_fsidtype);
290 hash ^= hash_mem(cp, len, EXPKEY_HASHBITS);
291 hash ^= hash_ptr(new->ek_client, EXPKEY_HASHBITS);
292 hash &= EXPKEY_HASHMASK;
294 ch = sunrpc_cache_update(&svc_expkey_cache, &new->h,
297 return container_of(ch, struct svc_expkey, h);
303 #define EXPORT_HASHBITS 8
304 #define EXPORT_HASHMAX (1<< EXPORT_HASHBITS)
305 #define EXPORT_HASHMASK (EXPORT_HASHMAX -1)
307 static struct cache_head *export_table[EXPORT_HASHMAX];
309 static void nfsd4_fslocs_free(struct nfsd4_fs_locations *fsloc)
313 for (i = 0; i < fsloc->locations_count; i++) {
314 kfree(fsloc->locations[i].path);
315 kfree(fsloc->locations[i].hosts);
317 kfree(fsloc->locations);
320 static void svc_export_put(struct kref *ref)
322 struct svc_export *exp = container_of(ref, struct svc_export, h.ref);
323 path_put(&exp->ex_path);
324 auth_domain_put(exp->ex_client);
325 kfree(exp->ex_pathname);
326 nfsd4_fslocs_free(&exp->ex_fslocs);
330 static void svc_export_request(struct cache_detail *cd,
331 struct cache_head *h,
332 char **bpp, int *blen)
335 struct svc_export *exp = container_of(h, struct svc_export, h);
338 qword_add(bpp, blen, exp->ex_client->name);
339 pth = d_path(&exp->ex_path, *bpp, *blen);
341 /* is this correct? */
345 qword_add(bpp, blen, pth);
349 static int svc_export_upcall(struct cache_detail *cd, struct cache_head *h)
351 return sunrpc_cache_pipe_upcall(cd, h, svc_export_request);
354 static struct svc_export *svc_export_update(struct svc_export *new,
355 struct svc_export *old);
356 static struct svc_export *svc_export_lookup(struct svc_export *);
358 static int check_export(struct inode *inode, int *flags, unsigned char *uuid)
362 * We currently export only dirs, regular files, and (for v4
363 * pseudoroot) symlinks.
365 if (!S_ISDIR(inode->i_mode) &&
366 !S_ISLNK(inode->i_mode) &&
367 !S_ISREG(inode->i_mode))
371 * Mountd should never pass down a writeable V4ROOT export, but,
374 if (*flags & NFSEXP_V4ROOT)
375 *flags |= NFSEXP_READONLY;
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 * XXX: It would be nice to also check whether this
473 * pseudoflavor is supported, so we can discover the
474 * problem at export time instead of when a client fails
477 err = get_int(mesg, &f->flags);
480 /* Only some flags are allowed to differ between flavors: */
481 if (~NFSEXP_SECINFO_FLAGS & (f->flags ^ exp->ex_flags))
484 exp->ex_nflavors = listsize;
488 #else /* CONFIG_NFSD_V4 */
490 fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc){return 0;}
492 secinfo_parse(char **mesg, char *buf, struct svc_export *exp) { return 0; }
495 static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen)
497 /* client path expiry [flags anonuid anongid fsid] */
501 struct auth_domain *dom = NULL;
502 struct svc_export exp = {}, *expp;
505 if (mesg[mlen-1] != '\n')
509 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
515 len = qword_get(&mesg, buf, PAGE_SIZE);
520 dom = auth_domain_find(buf);
526 if ((len = qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
529 err = kern_path(buf, 0, &exp.ex_path);
536 exp.ex_pathname = kstrdup(buf, GFP_KERNEL);
537 if (!exp.ex_pathname)
542 exp.h.expiry_time = get_expiry(&mesg);
543 if (exp.h.expiry_time == 0)
547 err = get_int(&mesg, &an_int);
548 if (err == -ENOENT) {
550 set_bit(CACHE_NEGATIVE, &exp.h.flags);
552 if (err || an_int < 0)
554 exp.ex_flags= an_int;
557 err = get_int(&mesg, &an_int);
560 exp.ex_anon_uid= an_int;
563 err = get_int(&mesg, &an_int);
566 exp.ex_anon_gid= an_int;
569 err = get_int(&mesg, &an_int);
572 exp.ex_fsid = an_int;
574 while ((len = qword_get(&mesg, buf, PAGE_SIZE)) > 0) {
575 if (strcmp(buf, "fsloc") == 0)
576 err = fsloc_parse(&mesg, buf, &exp.ex_fslocs);
577 else if (strcmp(buf, "uuid") == 0) {
578 /* expect a 16 byte uuid encoded as \xXXXX... */
579 len = qword_get(&mesg, buf, PAGE_SIZE);
584 kmemdup(buf, 16, GFP_KERNEL);
585 if (exp.ex_uuid == NULL)
588 } else if (strcmp(buf, "secinfo") == 0)
589 err = secinfo_parse(&mesg, buf, &exp);
591 /* quietly ignore unknown words and anything
592 * following. Newer user-space can try to set
593 * new values, then see what the result was.
600 err = check_export(exp.ex_path.dentry->d_inode, &exp.ex_flags,
606 expp = svc_export_lookup(&exp);
608 expp = svc_export_update(&exp, expp);
617 nfsd4_fslocs_free(&exp.ex_fslocs);
620 kfree(exp.ex_pathname);
622 path_put(&exp.ex_path);
624 auth_domain_put(dom);
630 static void exp_flags(struct seq_file *m, int flag, int fsid,
631 uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fslocs);
632 static void show_secinfo(struct seq_file *m, struct svc_export *exp);
634 static int svc_export_show(struct seq_file *m,
635 struct cache_detail *cd,
636 struct cache_head *h)
638 struct svc_export *exp ;
641 seq_puts(m, "#path domain(flags)\n");
644 exp = container_of(h, struct svc_export, h);
645 seq_path(m, &exp->ex_path, " \t\n\\");
647 seq_escape(m, exp->ex_client->name, " \t\n\\");
649 if (test_bit(CACHE_VALID, &h->flags) &&
650 !test_bit(CACHE_NEGATIVE, &h->flags)) {
651 exp_flags(m, exp->ex_flags, exp->ex_fsid,
652 exp->ex_anon_uid, exp->ex_anon_gid, &exp->ex_fslocs);
655 seq_puts(m, ",uuid=");
656 for (i=0; i<16; i++) {
659 seq_printf(m, "%02x", exp->ex_uuid[i]);
662 show_secinfo(m, exp);
667 static int svc_export_match(struct cache_head *a, struct cache_head *b)
669 struct svc_export *orig = container_of(a, struct svc_export, h);
670 struct svc_export *new = container_of(b, struct svc_export, h);
671 return orig->ex_client == new->ex_client &&
672 orig->ex_path.dentry == new->ex_path.dentry &&
673 orig->ex_path.mnt == new->ex_path.mnt;
676 static void svc_export_init(struct cache_head *cnew, struct cache_head *citem)
678 struct svc_export *new = container_of(cnew, struct svc_export, h);
679 struct svc_export *item = container_of(citem, struct svc_export, h);
681 kref_get(&item->ex_client->ref);
682 new->ex_client = item->ex_client;
683 new->ex_path.dentry = dget(item->ex_path.dentry);
684 new->ex_path.mnt = mntget(item->ex_path.mnt);
685 new->ex_pathname = NULL;
686 new->ex_fslocs.locations = NULL;
687 new->ex_fslocs.locations_count = 0;
688 new->ex_fslocs.migrated = 0;
691 static void export_update(struct cache_head *cnew, struct cache_head *citem)
693 struct svc_export *new = container_of(cnew, struct svc_export, h);
694 struct svc_export *item = container_of(citem, struct svc_export, h);
697 new->ex_flags = item->ex_flags;
698 new->ex_anon_uid = item->ex_anon_uid;
699 new->ex_anon_gid = item->ex_anon_gid;
700 new->ex_fsid = item->ex_fsid;
701 new->ex_uuid = item->ex_uuid;
702 item->ex_uuid = NULL;
703 new->ex_pathname = item->ex_pathname;
704 item->ex_pathname = NULL;
705 new->ex_fslocs.locations = item->ex_fslocs.locations;
706 item->ex_fslocs.locations = NULL;
707 new->ex_fslocs.locations_count = item->ex_fslocs.locations_count;
708 item->ex_fslocs.locations_count = 0;
709 new->ex_fslocs.migrated = item->ex_fslocs.migrated;
710 item->ex_fslocs.migrated = 0;
711 new->ex_nflavors = item->ex_nflavors;
712 for (i = 0; i < MAX_SECINFO_LIST; i++) {
713 new->ex_flavors[i] = item->ex_flavors[i];
717 static struct cache_head *svc_export_alloc(void)
719 struct svc_export *i = kmalloc(sizeof(*i), GFP_KERNEL);
726 struct cache_detail svc_export_cache = {
727 .owner = THIS_MODULE,
728 .hash_size = EXPORT_HASHMAX,
729 .hash_table = export_table,
730 .name = "nfsd.export",
731 .cache_put = svc_export_put,
732 .cache_upcall = svc_export_upcall,
733 .cache_parse = svc_export_parse,
734 .cache_show = svc_export_show,
735 .match = svc_export_match,
736 .init = svc_export_init,
737 .update = export_update,
738 .alloc = svc_export_alloc,
741 static struct svc_export *
742 svc_export_lookup(struct svc_export *exp)
744 struct cache_head *ch;
746 hash = hash_ptr(exp->ex_client, EXPORT_HASHBITS);
747 hash ^= hash_ptr(exp->ex_path.dentry, EXPORT_HASHBITS);
748 hash ^= hash_ptr(exp->ex_path.mnt, EXPORT_HASHBITS);
750 ch = sunrpc_cache_lookup(&svc_export_cache, &exp->h,
753 return container_of(ch, struct svc_export, h);
758 static struct svc_export *
759 svc_export_update(struct svc_export *new, struct svc_export *old)
761 struct cache_head *ch;
763 hash = hash_ptr(old->ex_client, EXPORT_HASHBITS);
764 hash ^= hash_ptr(old->ex_path.dentry, EXPORT_HASHBITS);
765 hash ^= hash_ptr(old->ex_path.mnt, EXPORT_HASHBITS);
767 ch = sunrpc_cache_update(&svc_export_cache, &new->h,
771 return container_of(ch, struct svc_export, h);
777 static struct svc_expkey *
778 exp_find_key(svc_client *clp, int fsid_type, u32 *fsidv, struct cache_req *reqp)
780 struct svc_expkey key, *ek;
784 return ERR_PTR(-ENOENT);
787 key.ek_fsidtype = fsid_type;
788 memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
790 ek = svc_expkey_lookup(&key);
792 return ERR_PTR(-ENOMEM);
793 err = cache_check(&svc_expkey_cache, &ek->h, reqp);
799 static int exp_set_key(svc_client *clp, int fsid_type, u32 *fsidv,
800 struct svc_export *exp)
802 struct svc_expkey key, *ek;
805 key.ek_fsidtype = fsid_type;
806 memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
807 key.ek_path = exp->ex_path;
808 key.h.expiry_time = NEVER;
811 ek = svc_expkey_lookup(&key);
813 ek = svc_expkey_update(&key,ek);
815 cache_put(&ek->h, &svc_expkey_cache);
822 * Find the client's export entry matching xdev/xino.
824 static inline struct svc_expkey *
825 exp_get_key(svc_client *clp, dev_t dev, ino_t ino)
829 if (old_valid_dev(dev)) {
830 mk_fsid(FSID_DEV, fsidv, dev, ino, 0, NULL);
831 return exp_find_key(clp, FSID_DEV, fsidv, NULL);
833 mk_fsid(FSID_ENCODE_DEV, fsidv, dev, ino, 0, NULL);
834 return exp_find_key(clp, FSID_ENCODE_DEV, fsidv, NULL);
838 * Find the client's export entry matching fsid
840 static inline struct svc_expkey *
841 exp_get_fsid_key(svc_client *clp, int fsid)
845 mk_fsid(FSID_NUM, fsidv, 0, 0, fsid, NULL);
847 return exp_find_key(clp, FSID_NUM, fsidv, NULL);
850 static svc_export *exp_get_by_name(svc_client *clp, const struct path *path,
851 struct cache_req *reqp)
853 struct svc_export *exp, key;
857 return ERR_PTR(-ENOENT);
862 exp = svc_export_lookup(&key);
864 return ERR_PTR(-ENOMEM);
865 err = cache_check(&svc_export_cache, &exp->h, reqp);
872 * Find the export entry for a given dentry.
874 static struct svc_export *exp_parent(svc_client *clp, struct path *path)
876 struct dentry *saved = dget(path->dentry);
877 svc_export *exp = exp_get_by_name(clp, path, NULL);
879 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) {
880 struct dentry *parent = dget_parent(path->dentry);
882 path->dentry = parent;
883 exp = exp_get_by_name(clp, path, NULL);
886 path->dentry = saved;
891 * Hashtable locking. Write locks are placed only by user processes
892 * wanting to modify export information.
893 * Write locking only done in this file. Read locking
897 static DECLARE_RWSEM(hash_sem);
902 down_read(&hash_sem);
908 down_write(&hash_sem);
918 exp_writeunlock(void)
923 static void exp_fsid_unhash(struct svc_export *exp)
925 struct svc_expkey *ek;
927 if ((exp->ex_flags & NFSEXP_FSID) == 0)
930 ek = exp_get_fsid_key(exp->ex_client, exp->ex_fsid);
932 ek->h.expiry_time = get_seconds()-1;
933 cache_put(&ek->h, &svc_expkey_cache);
935 svc_expkey_cache.nextcheck = get_seconds();
938 static int exp_fsid_hash(svc_client *clp, struct svc_export *exp)
942 if ((exp->ex_flags & NFSEXP_FSID) == 0)
945 mk_fsid(FSID_NUM, fsid, 0, 0, exp->ex_fsid, NULL);
946 return exp_set_key(clp, FSID_NUM, fsid, exp);
949 static int exp_hash(struct auth_domain *clp, struct svc_export *exp)
952 struct inode *inode = exp->ex_path.dentry->d_inode;
953 dev_t dev = inode->i_sb->s_dev;
955 if (old_valid_dev(dev)) {
956 mk_fsid(FSID_DEV, fsid, dev, inode->i_ino, 0, NULL);
957 return exp_set_key(clp, FSID_DEV, fsid, exp);
959 mk_fsid(FSID_ENCODE_DEV, fsid, dev, inode->i_ino, 0, NULL);
960 return exp_set_key(clp, FSID_ENCODE_DEV, fsid, exp);
963 static void exp_unhash(struct svc_export *exp)
965 struct svc_expkey *ek;
966 struct inode *inode = exp->ex_path.dentry->d_inode;
968 ek = exp_get_key(exp->ex_client, inode->i_sb->s_dev, inode->i_ino);
970 ek->h.expiry_time = get_seconds()-1;
971 cache_put(&ek->h, &svc_expkey_cache);
973 svc_expkey_cache.nextcheck = get_seconds();
977 * Export a file system.
980 exp_export(struct nfsctl_export *nxp)
983 struct svc_export *exp = NULL;
984 struct svc_export new;
985 struct svc_expkey *fsid_key = NULL;
989 /* Consistency check */
991 if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) ||
992 !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX))
995 dprintk("exp_export called for %s:%s (%x/%ld fl %x).\n",
996 nxp->ex_client, nxp->ex_path,
997 (unsigned)nxp->ex_dev, (long)nxp->ex_ino,
1000 /* Try to lock the export table for update */
1003 /* Look up client info */
1004 if (!(clp = auth_domain_find(nxp->ex_client)))
1008 /* Look up the dentry */
1009 err = kern_path(nxp->ex_path, 0, &path);
1014 exp = exp_get_by_name(clp, &path, NULL);
1016 memset(&new, 0, sizeof(new));
1018 /* must make sure there won't be an ex_fsid clash */
1019 if ((nxp->ex_flags & NFSEXP_FSID) &&
1020 (!IS_ERR(fsid_key = exp_get_fsid_key(clp, nxp->ex_dev))) &&
1021 fsid_key->ek_path.mnt &&
1022 (fsid_key->ek_path.mnt != path.mnt ||
1023 fsid_key->ek_path.dentry != path.dentry))
1027 /* just a flags/id/fsid update */
1029 exp_fsid_unhash(exp);
1030 exp->ex_flags = nxp->ex_flags;
1031 exp->ex_anon_uid = nxp->ex_anon_uid;
1032 exp->ex_anon_gid = nxp->ex_anon_gid;
1033 exp->ex_fsid = nxp->ex_dev;
1035 err = exp_fsid_hash(clp, exp);
1039 err = check_export(path.dentry->d_inode, &nxp->ex_flags, NULL);
1040 if (err) goto finish;
1044 dprintk("nfsd: creating export entry %p for client %p\n", exp, clp);
1046 new.h.expiry_time = NEVER;
1048 new.ex_pathname = kstrdup(nxp->ex_path, GFP_KERNEL);
1049 if (!new.ex_pathname)
1051 new.ex_client = clp;
1053 new.ex_flags = nxp->ex_flags;
1054 new.ex_anon_uid = nxp->ex_anon_uid;
1055 new.ex_anon_gid = nxp->ex_anon_gid;
1056 new.ex_fsid = nxp->ex_dev;
1058 exp = svc_export_lookup(&new);
1060 exp = svc_export_update(&new, exp);
1065 if (exp_hash(clp, exp) ||
1066 exp_fsid_hash(clp, exp)) {
1067 /* failed to create at least one index */
1068 exp_do_unexport(exp);
1073 kfree(new.ex_pathname);
1076 if (fsid_key && !IS_ERR(fsid_key))
1077 cache_put(&fsid_key->h, &svc_expkey_cache);
1080 auth_domain_put(clp);
1088 * Unexport a file system. The export entry has already
1089 * been removed from the client's list of exported fs's.
1092 exp_do_unexport(svc_export *unexp)
1094 unexp->h.expiry_time = get_seconds()-1;
1095 svc_export_cache.nextcheck = get_seconds();
1097 exp_fsid_unhash(unexp);
1105 exp_unexport(struct nfsctl_export *nxp)
1107 struct auth_domain *dom;
1112 /* Consistency check */
1113 if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) ||
1114 !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX))
1120 dom = auth_domain_find(nxp->ex_client);
1122 dprintk("nfsd: unexport couldn't find %s\n", nxp->ex_client);
1126 err = kern_path(nxp->ex_path, 0, &path);
1131 exp = exp_get_by_name(dom, &path, NULL);
1136 exp_do_unexport(exp);
1141 auth_domain_put(dom);
1149 * Obtain the root fh on behalf of a client.
1150 * This could be done in user space, but I feel that it adds some safety
1151 * since its harder to fool a kernel module than a user space program.
1154 exp_rootfh(svc_client *clp, char *name, struct knfsd_fh *f, int maxsize)
1156 struct svc_export *exp;
1158 struct inode *inode;
1163 /* NB: we probably ought to check that it's NUL-terminated */
1164 if (kern_path(name, 0, &path)) {
1165 printk("nfsd: exp_rootfh path not found %s", name);
1168 inode = path.dentry->d_inode;
1170 dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n",
1171 name, path.dentry, clp->name,
1172 inode->i_sb->s_id, inode->i_ino);
1173 exp = exp_parent(clp, &path);
1180 * fh must be initialized before calling fh_compose
1182 fh_init(&fh, maxsize);
1183 if (fh_compose(&fh, exp, path.dentry, NULL))
1187 memcpy(f, &fh.fh_handle, sizeof(struct knfsd_fh));
1195 static struct svc_export *exp_find(struct auth_domain *clp, int fsid_type,
1196 u32 *fsidv, struct cache_req *reqp)
1198 struct svc_export *exp;
1199 struct svc_expkey *ek = exp_find_key(clp, fsid_type, fsidv, reqp);
1201 return ERR_CAST(ek);
1203 exp = exp_get_by_name(clp, &ek->ek_path, reqp);
1204 cache_put(&ek->h, &svc_expkey_cache);
1207 return ERR_CAST(exp);
1211 __be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp)
1213 struct exp_flavor_info *f;
1214 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
1216 /* legacy gss-only clients are always OK: */
1217 if (exp->ex_client == rqstp->rq_gssclient)
1219 /* ip-address based client; check sec= export option: */
1220 for (f = exp->ex_flavors; f < end; f++) {
1221 if (f->pseudoflavor == rqstp->rq_flavor)
1224 /* defaults in absence of sec= options: */
1225 if (exp->ex_nflavors == 0) {
1226 if (rqstp->rq_flavor == RPC_AUTH_NULL ||
1227 rqstp->rq_flavor == RPC_AUTH_UNIX)
1230 return nfserr_wrongsec;
1234 * Uses rq_client and rq_gssclient to find an export; uses rq_client (an
1235 * auth_unix client) if it's available and has secinfo information;
1236 * otherwise, will try to use rq_gssclient.
1238 * Called from functions that handle requests; functions that do work on
1239 * behalf of mountd are passed a single client name to use, and should
1240 * use exp_get_by_name() or exp_find().
1243 rqst_exp_get_by_name(struct svc_rqst *rqstp, struct path *path)
1245 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
1247 if (rqstp->rq_client == NULL)
1250 /* First try the auth_unix client: */
1251 exp = exp_get_by_name(rqstp->rq_client, path, &rqstp->rq_chandle);
1252 if (PTR_ERR(exp) == -ENOENT)
1256 /* If it has secinfo, assume there are no gss/... clients */
1257 if (exp->ex_nflavors > 0)
1260 /* Otherwise, try falling back on gss client */
1261 if (rqstp->rq_gssclient == NULL)
1263 gssexp = exp_get_by_name(rqstp->rq_gssclient, path, &rqstp->rq_chandle);
1264 if (PTR_ERR(gssexp) == -ENOENT)
1272 rqst_exp_find(struct svc_rqst *rqstp, int fsid_type, u32 *fsidv)
1274 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
1276 if (rqstp->rq_client == NULL)
1279 /* First try the auth_unix client: */
1280 exp = exp_find(rqstp->rq_client, fsid_type, fsidv, &rqstp->rq_chandle);
1281 if (PTR_ERR(exp) == -ENOENT)
1285 /* If it has secinfo, assume there are no gss/... clients */
1286 if (exp->ex_nflavors > 0)
1289 /* Otherwise, try falling back on gss client */
1290 if (rqstp->rq_gssclient == NULL)
1292 gssexp = exp_find(rqstp->rq_gssclient, fsid_type, fsidv,
1293 &rqstp->rq_chandle);
1294 if (PTR_ERR(gssexp) == -ENOENT)
1302 rqst_exp_parent(struct svc_rqst *rqstp, struct path *path)
1304 struct dentry *saved = dget(path->dentry);
1305 struct svc_export *exp = rqst_exp_get_by_name(rqstp, path);
1307 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) {
1308 struct dentry *parent = dget_parent(path->dentry);
1310 path->dentry = parent;
1311 exp = rqst_exp_get_by_name(rqstp, path);
1314 path->dentry = saved;
1318 static struct svc_export *find_fsidzero_export(struct svc_rqst *rqstp)
1322 mk_fsid(FSID_NUM, fsidv, 0, 0, 0, NULL);
1324 return rqst_exp_find(rqstp, FSID_NUM, fsidv);
1328 * Called when we need the filehandle for the root of the pseudofs,
1329 * for a given NFSv4 client. The root is defined to be the
1330 * export point with fsid==0
1333 exp_pseudoroot(struct svc_rqst *rqstp, struct svc_fh *fhp)
1335 struct svc_export *exp;
1338 exp = find_fsidzero_export(rqstp);
1340 return nfserrno(PTR_ERR(exp));
1341 rv = fh_compose(fhp, exp, exp->ex_path.dentry, NULL);
1344 rv = check_nfsd_access(exp, rqstp);
1354 static void *e_start(struct seq_file *m, loff_t *pos)
1355 __acquires(svc_export_cache.hash_lock)
1358 unsigned hash, export;
1359 struct cache_head *ch;
1362 read_lock(&svc_export_cache.hash_lock);
1364 return SEQ_START_TOKEN;
1366 export = n & ((1LL<<32) - 1);
1369 for (ch=export_table[hash]; ch; ch=ch->next)
1372 n &= ~((1LL<<32) - 1);
1376 } while(hash < EXPORT_HASHMAX && export_table[hash]==NULL);
1377 if (hash >= EXPORT_HASHMAX)
1380 return export_table[hash];
1383 static void *e_next(struct seq_file *m, void *p, loff_t *pos)
1385 struct cache_head *ch = p;
1386 int hash = (*pos >> 32);
1388 if (p == SEQ_START_TOKEN)
1390 else if (ch->next == NULL) {
1397 *pos &= ~((1LL<<32) - 1);
1398 while (hash < EXPORT_HASHMAX && export_table[hash] == NULL) {
1402 if (hash >= EXPORT_HASHMAX)
1405 return export_table[hash];
1408 static void e_stop(struct seq_file *m, void *p)
1409 __releases(svc_export_cache.hash_lock)
1411 read_unlock(&svc_export_cache.hash_lock);
1415 static struct flags {
1419 { NFSEXP_READONLY, {"ro", "rw"}},
1420 { NFSEXP_INSECURE_PORT, {"insecure", ""}},
1421 { NFSEXP_ROOTSQUASH, {"root_squash", "no_root_squash"}},
1422 { NFSEXP_ALLSQUASH, {"all_squash", ""}},
1423 { NFSEXP_ASYNC, {"async", "sync"}},
1424 { NFSEXP_GATHERED_WRITES, {"wdelay", "no_wdelay"}},
1425 { NFSEXP_NOHIDE, {"nohide", ""}},
1426 { NFSEXP_CROSSMOUNT, {"crossmnt", ""}},
1427 { NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}},
1428 { NFSEXP_NOAUTHNLM, {"insecure_locks", ""}},
1429 { NFSEXP_V4ROOT, {"v4root", ""}},
1431 { NFSEXP_MSNFS, {"msnfs", ""}},
1436 static void show_expflags(struct seq_file *m, int flags, int mask)
1439 int state, first = 0;
1441 for (flg = expflags; flg->flag; flg++) {
1442 if (flg->flag & ~mask)
1444 state = (flg->flag & flags) ? 0 : 1;
1445 if (*flg->name[state])
1446 seq_printf(m, "%s%s", first++?",":"", flg->name[state]);
1450 static void show_secinfo_flags(struct seq_file *m, int flags)
1453 show_expflags(m, flags, NFSEXP_SECINFO_FLAGS);
1456 static void show_secinfo(struct seq_file *m, struct svc_export *exp)
1458 struct exp_flavor_info *f;
1459 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
1460 int lastflags = 0, first = 0;
1462 if (exp->ex_nflavors == 0)
1464 for (f = exp->ex_flavors; f < end; f++) {
1465 if (first || f->flags != lastflags) {
1467 show_secinfo_flags(m, lastflags);
1468 seq_printf(m, ",sec=%d", f->pseudoflavor);
1469 lastflags = f->flags;
1471 seq_printf(m, ":%d", f->pseudoflavor);
1474 show_secinfo_flags(m, lastflags);
1477 static void exp_flags(struct seq_file *m, int flag, int fsid,
1478 uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fsloc)
1480 show_expflags(m, flag, NFSEXP_ALLFLAGS);
1481 if (flag & NFSEXP_FSID)
1482 seq_printf(m, ",fsid=%d", fsid);
1483 if (anonu != (uid_t)-2 && anonu != (0x10000-2))
1484 seq_printf(m, ",anonuid=%u", anonu);
1485 if (anong != (gid_t)-2 && anong != (0x10000-2))
1486 seq_printf(m, ",anongid=%u", anong);
1487 if (fsloc && fsloc->locations_count > 0) {
1488 char *loctype = (fsloc->migrated) ? "refer" : "replicas";
1491 seq_printf(m, ",%s=", loctype);
1492 seq_escape(m, fsloc->locations[0].path, ",;@ \t\n\\");
1494 seq_escape(m, fsloc->locations[0].hosts, ",;@ \t\n\\");
1495 for (i = 1; i < fsloc->locations_count; i++) {
1497 seq_escape(m, fsloc->locations[i].path, ",;@ \t\n\\");
1499 seq_escape(m, fsloc->locations[i].hosts, ",;@ \t\n\\");
1504 static int e_show(struct seq_file *m, void *p)
1506 struct cache_head *cp = p;
1507 struct svc_export *exp = container_of(cp, struct svc_export, h);
1509 if (p == SEQ_START_TOKEN) {
1510 seq_puts(m, "# Version 1.1\n");
1511 seq_puts(m, "# Path Client(Flags) # IPs\n");
1516 if (cache_check(&svc_export_cache, &exp->h, NULL))
1518 cache_put(&exp->h, &svc_export_cache);
1519 return svc_export_show(m, &svc_export_cache, cp);
1522 const struct seq_operations nfs_exports_op = {
1530 * Add or modify a client.
1531 * Change requests may involve the list of host addresses. The list of
1532 * exports and possibly existing uid maps are left untouched.
1535 exp_addclient(struct nfsctl_client *ncp)
1537 struct auth_domain *dom;
1539 struct in6_addr addr6;
1541 /* First, consistency check. */
1543 if (! exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX))
1545 if (ncp->cl_naddr > NFSCLNT_ADDRMAX)
1548 /* Lock the hashtable */
1551 dom = unix_domain_find(ncp->cl_ident);
1557 /* Insert client into hashtable. */
1558 for (i = 0; i < ncp->cl_naddr; i++) {
1559 ipv6_addr_set_v4mapped(ncp->cl_addrlist[i].s_addr, &addr6);
1560 auth_unix_add_addr(&addr6, dom);
1562 auth_unix_forget_old(dom);
1563 auth_domain_put(dom);
1574 * Delete a client given an identifier.
1577 exp_delclient(struct nfsctl_client *ncp)
1580 struct auth_domain *dom;
1583 if (!exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX))
1586 /* Lock the hashtable */
1589 dom = auth_domain_find(ncp->cl_ident);
1590 /* just make sure that no addresses work
1591 * and that it will expire soon
1594 err = auth_unix_forget_old(dom);
1595 auth_domain_put(dom);
1604 * Verify that string is non-empty and does not exceed max length.
1607 exp_verify_string(char *cp, int max)
1611 for (i = 0; i < max; i++)
1615 printk(KERN_NOTICE "nfsd: couldn't validate string %s\n", cp);
1620 * Initialize the exports module.
1623 nfsd_export_init(void)
1626 dprintk("nfsd: initializing export module.\n");
1628 rv = cache_register(&svc_export_cache);
1631 rv = cache_register(&svc_expkey_cache);
1633 cache_unregister(&svc_export_cache);
1639 * Flush exports table - called when last nfsd thread is killed
1642 nfsd_export_flush(void)
1645 cache_purge(&svc_expkey_cache);
1646 cache_purge(&svc_export_cache);
1651 * Shutdown the exports module.
1654 nfsd_export_shutdown(void)
1657 dprintk("nfsd: shutting down export module.\n");
1661 cache_unregister(&svc_expkey_cache);
1662 cache_unregister(&svc_export_cache);
1663 svcauth_unix_purge();
1666 dprintk("nfsd: export shutdown complete.\n");