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/namei.h>
18 #include <linux/module.h>
19 #include <linux/exportfs.h>
21 #include <linux/nfsd/nfsd.h>
22 #include <linux/nfsd/syscall.h>
25 #define NFSDDBG_FACILITY NFSDDBG_EXPORT
27 typedef struct auth_domain svc_client;
28 typedef struct svc_export svc_export;
30 static void exp_do_unexport(svc_export *unexp);
31 static int exp_verify_string(char *cp, int max);
35 * One maps client+vfsmnt+dentry to export options - the export map
36 * The other maps client+filehandle-fragment to export options. - the expkey map
38 * The export options are actually stored in the first map, and the
39 * second map contains a reference to the entry in the first map.
42 #define EXPKEY_HASHBITS 8
43 #define EXPKEY_HASHMAX (1 << EXPKEY_HASHBITS)
44 #define EXPKEY_HASHMASK (EXPKEY_HASHMAX -1)
45 static struct cache_head *expkey_table[EXPKEY_HASHMAX];
47 static void expkey_put(struct kref *ref)
49 struct svc_expkey *key = container_of(ref, struct svc_expkey, h.ref);
51 if (test_bit(CACHE_VALID, &key->h.flags) &&
52 !test_bit(CACHE_NEGATIVE, &key->h.flags))
53 path_put(&key->ek_path);
54 auth_domain_put(key->ek_client);
58 static void expkey_request(struct cache_detail *cd,
60 char **bpp, int *blen)
62 /* client fsidtype \xfsid */
63 struct svc_expkey *ek = container_of(h, struct svc_expkey, h);
66 qword_add(bpp, blen, ek->ek_client->name);
67 snprintf(type, 5, "%d", ek->ek_fsidtype);
68 qword_add(bpp, blen, type);
69 qword_addhex(bpp, blen, (char*)ek->ek_fsid, key_len(ek->ek_fsidtype));
73 static int expkey_upcall(struct cache_detail *cd, struct cache_head *h)
75 return sunrpc_cache_pipe_upcall(cd, h, expkey_request);
78 static struct svc_expkey *svc_expkey_update(struct svc_expkey *new, struct svc_expkey *old);
79 static struct svc_expkey *svc_expkey_lookup(struct svc_expkey *);
80 static struct cache_detail svc_expkey_cache;
82 static int expkey_parse(struct cache_detail *cd, char *mesg, int mlen)
84 /* client fsidtype fsid [path] */
87 struct auth_domain *dom = NULL;
91 struct svc_expkey key;
92 struct svc_expkey *ek = NULL;
94 if (mesg[mlen-1] != '\n')
98 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
104 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
108 dom = auth_domain_find(buf);
111 dprintk("found domain %s\n", buf);
114 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
116 fsidtype = simple_strtoul(buf, &ep, 10);
119 dprintk("found fsidtype %d\n", fsidtype);
120 if (key_len(fsidtype)==0) /* invalid type */
122 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
124 dprintk("found fsid length %d\n", len);
125 if (len != key_len(fsidtype))
128 /* OK, we seem to have a valid key */
130 key.h.expiry_time = get_expiry(&mesg);
131 if (key.h.expiry_time == 0)
135 key.ek_fsidtype = fsidtype;
136 memcpy(key.ek_fsid, buf, len);
138 ek = svc_expkey_lookup(&key);
143 /* now we want a pathname, or empty meaning NEGATIVE */
145 len = qword_get(&mesg, buf, PAGE_SIZE);
148 dprintk("Path seems to be <%s>\n", buf);
151 set_bit(CACHE_NEGATIVE, &key.h.flags);
152 ek = svc_expkey_update(&key, ek);
156 err = kern_path(buf, 0, &key.ek_path);
160 dprintk("Found the path %s\n", buf);
162 ek = svc_expkey_update(&key, ek);
165 path_put(&key.ek_path);
170 cache_put(&ek->h, &svc_expkey_cache);
172 auth_domain_put(dom);
177 static int expkey_show(struct seq_file *m,
178 struct cache_detail *cd,
179 struct cache_head *h)
181 struct svc_expkey *ek ;
185 seq_puts(m, "#domain fsidtype fsid [path]\n");
188 ek = container_of(h, struct svc_expkey, h);
189 seq_printf(m, "%s %d 0x", ek->ek_client->name,
191 for (i=0; i < key_len(ek->ek_fsidtype)/4; i++)
192 seq_printf(m, "%08x", ek->ek_fsid[i]);
193 if (test_bit(CACHE_VALID, &h->flags) &&
194 !test_bit(CACHE_NEGATIVE, &h->flags)) {
196 seq_path(m, &ek->ek_path, "\\ \t\n");
202 static inline int expkey_match (struct cache_head *a, struct cache_head *b)
204 struct svc_expkey *orig = container_of(a, struct svc_expkey, h);
205 struct svc_expkey *new = container_of(b, struct svc_expkey, h);
207 if (orig->ek_fsidtype != new->ek_fsidtype ||
208 orig->ek_client != new->ek_client ||
209 memcmp(orig->ek_fsid, new->ek_fsid, key_len(orig->ek_fsidtype)) != 0)
214 static inline void expkey_init(struct cache_head *cnew,
215 struct cache_head *citem)
217 struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
218 struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
220 kref_get(&item->ek_client->ref);
221 new->ek_client = item->ek_client;
222 new->ek_fsidtype = item->ek_fsidtype;
224 memcpy(new->ek_fsid, item->ek_fsid, sizeof(new->ek_fsid));
227 static inline void expkey_update(struct cache_head *cnew,
228 struct cache_head *citem)
230 struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
231 struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
233 new->ek_path = item->ek_path;
234 path_get(&item->ek_path);
237 static struct cache_head *expkey_alloc(void)
239 struct svc_expkey *i = kmalloc(sizeof(*i), GFP_KERNEL);
246 static struct cache_detail svc_expkey_cache = {
247 .owner = THIS_MODULE,
248 .hash_size = EXPKEY_HASHMAX,
249 .hash_table = expkey_table,
251 .cache_put = expkey_put,
252 .cache_upcall = expkey_upcall,
253 .cache_parse = expkey_parse,
254 .cache_show = expkey_show,
255 .match = expkey_match,
257 .update = expkey_update,
258 .alloc = expkey_alloc,
261 static struct svc_expkey *
262 svc_expkey_lookup(struct svc_expkey *item)
264 struct cache_head *ch;
265 int hash = item->ek_fsidtype;
266 char * cp = (char*)item->ek_fsid;
267 int len = key_len(item->ek_fsidtype);
269 hash ^= hash_mem(cp, len, EXPKEY_HASHBITS);
270 hash ^= hash_ptr(item->ek_client, EXPKEY_HASHBITS);
271 hash &= EXPKEY_HASHMASK;
273 ch = sunrpc_cache_lookup(&svc_expkey_cache, &item->h,
276 return container_of(ch, struct svc_expkey, h);
281 static struct svc_expkey *
282 svc_expkey_update(struct svc_expkey *new, struct svc_expkey *old)
284 struct cache_head *ch;
285 int hash = new->ek_fsidtype;
286 char * cp = (char*)new->ek_fsid;
287 int len = key_len(new->ek_fsidtype);
289 hash ^= hash_mem(cp, len, EXPKEY_HASHBITS);
290 hash ^= hash_ptr(new->ek_client, EXPKEY_HASHBITS);
291 hash &= EXPKEY_HASHMASK;
293 ch = sunrpc_cache_update(&svc_expkey_cache, &new->h,
296 return container_of(ch, struct svc_expkey, h);
302 #define EXPORT_HASHBITS 8
303 #define EXPORT_HASHMAX (1<< EXPORT_HASHBITS)
304 #define EXPORT_HASHMASK (EXPORT_HASHMAX -1)
306 static struct cache_head *export_table[EXPORT_HASHMAX];
308 static void nfsd4_fslocs_free(struct nfsd4_fs_locations *fsloc)
312 for (i = 0; i < fsloc->locations_count; i++) {
313 kfree(fsloc->locations[i].path);
314 kfree(fsloc->locations[i].hosts);
316 kfree(fsloc->locations);
319 static void svc_export_put(struct kref *ref)
321 struct svc_export *exp = container_of(ref, struct svc_export, h.ref);
322 path_put(&exp->ex_path);
323 auth_domain_put(exp->ex_client);
324 kfree(exp->ex_pathname);
325 nfsd4_fslocs_free(&exp->ex_fslocs);
329 static void svc_export_request(struct cache_detail *cd,
330 struct cache_head *h,
331 char **bpp, int *blen)
334 struct svc_export *exp = container_of(h, struct svc_export, h);
337 qword_add(bpp, blen, exp->ex_client->name);
338 pth = d_path(&exp->ex_path, *bpp, *blen);
340 /* is this correct? */
344 qword_add(bpp, blen, pth);
348 static int svc_export_upcall(struct cache_detail *cd, struct cache_head *h)
350 return sunrpc_cache_pipe_upcall(cd, h, svc_export_request);
353 static struct svc_export *svc_export_update(struct svc_export *new,
354 struct svc_export *old);
355 static struct svc_export *svc_export_lookup(struct svc_export *);
357 static int check_export(struct inode *inode, int flags, unsigned char *uuid)
360 /* We currently export only dirs and regular files.
361 * This is what umountd does.
363 if (!S_ISDIR(inode->i_mode) &&
364 !S_ISREG(inode->i_mode))
367 /* There are two requirements on a filesystem to be exportable.
368 * 1: We must be able to identify the filesystem from a number.
369 * either a device number (so FS_REQUIRES_DEV needed)
370 * or an FSID number (so NFSEXP_FSID or ->uuid is needed).
371 * 2: We must be able to find an inode from a filehandle.
372 * This means that s_export_op must be set.
374 if (!(inode->i_sb->s_type->fs_flags & FS_REQUIRES_DEV) &&
375 !(flags & NFSEXP_FSID) &&
377 dprintk("exp_export: export of non-dev fs without fsid\n");
381 if (!inode->i_sb->s_export_op ||
382 !inode->i_sb->s_export_op->fh_to_dentry) {
383 dprintk("exp_export: export of invalid fs type.\n");
391 #ifdef CONFIG_NFSD_V4
394 fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc)
397 int migrated, i, err;
400 err = get_int(mesg, &fsloc->locations_count);
403 if (fsloc->locations_count > MAX_FS_LOCATIONS)
405 if (fsloc->locations_count == 0)
408 fsloc->locations = kzalloc(fsloc->locations_count
409 * sizeof(struct nfsd4_fs_location), GFP_KERNEL);
410 if (!fsloc->locations)
412 for (i=0; i < fsloc->locations_count; i++) {
413 /* colon separated host list */
415 len = qword_get(mesg, buf, PAGE_SIZE);
419 fsloc->locations[i].hosts = kstrdup(buf, GFP_KERNEL);
420 if (!fsloc->locations[i].hosts)
423 /* slash separated path component list */
424 len = qword_get(mesg, buf, PAGE_SIZE);
428 fsloc->locations[i].path = kstrdup(buf, GFP_KERNEL);
429 if (!fsloc->locations[i].path)
433 err = get_int(mesg, &migrated);
437 if (migrated < 0 || migrated > 1)
439 fsloc->migrated = migrated;
442 nfsd4_fslocs_free(fsloc);
446 static int secinfo_parse(char **mesg, char *buf, struct svc_export *exp)
449 struct exp_flavor_info *f;
451 err = get_int(mesg, &listsize);
454 if (listsize < 0 || listsize > MAX_SECINFO_LIST)
457 for (f = exp->ex_flavors; f < exp->ex_flavors + listsize; f++) {
458 err = get_int(mesg, &f->pseudoflavor);
462 * XXX: It would be nice to also check whether this
463 * pseudoflavor is supported, so we can discover the
464 * problem at export time instead of when a client fails
467 err = get_int(mesg, &f->flags);
470 /* Only some flags are allowed to differ between flavors: */
471 if (~NFSEXP_SECINFO_FLAGS & (f->flags ^ exp->ex_flags))
474 exp->ex_nflavors = listsize;
478 #else /* CONFIG_NFSD_V4 */
480 fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc){return 0;}
482 secinfo_parse(char **mesg, char *buf, struct svc_export *exp) { return 0; }
485 static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen)
487 /* client path expiry [flags anonuid anongid fsid] */
491 struct auth_domain *dom = NULL;
492 struct svc_export exp = {}, *expp;
495 if (mesg[mlen-1] != '\n')
499 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
505 len = qword_get(&mesg, buf, PAGE_SIZE);
510 dom = auth_domain_find(buf);
516 if ((len = qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
519 err = kern_path(buf, 0, &exp.ex_path);
526 exp.ex_pathname = kstrdup(buf, GFP_KERNEL);
527 if (!exp.ex_pathname)
532 exp.h.expiry_time = get_expiry(&mesg);
533 if (exp.h.expiry_time == 0)
537 err = get_int(&mesg, &an_int);
538 if (err == -ENOENT) {
540 set_bit(CACHE_NEGATIVE, &exp.h.flags);
542 if (err || an_int < 0)
544 exp.ex_flags= an_int;
547 err = get_int(&mesg, &an_int);
550 exp.ex_anon_uid= an_int;
553 err = get_int(&mesg, &an_int);
556 exp.ex_anon_gid= an_int;
559 err = get_int(&mesg, &an_int);
562 exp.ex_fsid = an_int;
564 while ((len = qword_get(&mesg, buf, PAGE_SIZE)) > 0) {
565 if (strcmp(buf, "fsloc") == 0)
566 err = fsloc_parse(&mesg, buf, &exp.ex_fslocs);
567 else if (strcmp(buf, "uuid") == 0) {
568 /* expect a 16 byte uuid encoded as \xXXXX... */
569 len = qword_get(&mesg, buf, PAGE_SIZE);
574 kmemdup(buf, 16, GFP_KERNEL);
575 if (exp.ex_uuid == NULL)
578 } else if (strcmp(buf, "secinfo") == 0)
579 err = secinfo_parse(&mesg, buf, &exp);
581 /* quietly ignore unknown words and anything
582 * following. Newer user-space can try to set
583 * new values, then see what the result was.
590 err = check_export(exp.ex_path.dentry->d_inode, exp.ex_flags,
596 expp = svc_export_lookup(&exp);
598 expp = svc_export_update(&exp, expp);
607 nfsd4_fslocs_free(&exp.ex_fslocs);
610 kfree(exp.ex_pathname);
612 path_put(&exp.ex_path);
614 auth_domain_put(dom);
620 static void exp_flags(struct seq_file *m, int flag, int fsid,
621 uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fslocs);
622 static void show_secinfo(struct seq_file *m, struct svc_export *exp);
624 static int svc_export_show(struct seq_file *m,
625 struct cache_detail *cd,
626 struct cache_head *h)
628 struct svc_export *exp ;
631 seq_puts(m, "#path domain(flags)\n");
634 exp = container_of(h, struct svc_export, h);
635 seq_path(m, &exp->ex_path, " \t\n\\");
637 seq_escape(m, exp->ex_client->name, " \t\n\\");
639 if (test_bit(CACHE_VALID, &h->flags) &&
640 !test_bit(CACHE_NEGATIVE, &h->flags)) {
641 exp_flags(m, exp->ex_flags, exp->ex_fsid,
642 exp->ex_anon_uid, exp->ex_anon_gid, &exp->ex_fslocs);
645 seq_puts(m, ",uuid=");
646 for (i=0; i<16; i++) {
649 seq_printf(m, "%02x", exp->ex_uuid[i]);
652 show_secinfo(m, exp);
657 static int svc_export_match(struct cache_head *a, struct cache_head *b)
659 struct svc_export *orig = container_of(a, struct svc_export, h);
660 struct svc_export *new = container_of(b, struct svc_export, h);
661 return orig->ex_client == new->ex_client &&
662 orig->ex_path.dentry == new->ex_path.dentry &&
663 orig->ex_path.mnt == new->ex_path.mnt;
666 static void svc_export_init(struct cache_head *cnew, struct cache_head *citem)
668 struct svc_export *new = container_of(cnew, struct svc_export, h);
669 struct svc_export *item = container_of(citem, struct svc_export, h);
671 kref_get(&item->ex_client->ref);
672 new->ex_client = item->ex_client;
673 new->ex_path.dentry = dget(item->ex_path.dentry);
674 new->ex_path.mnt = mntget(item->ex_path.mnt);
675 new->ex_pathname = NULL;
676 new->ex_fslocs.locations = NULL;
677 new->ex_fslocs.locations_count = 0;
678 new->ex_fslocs.migrated = 0;
681 static void export_update(struct cache_head *cnew, struct cache_head *citem)
683 struct svc_export *new = container_of(cnew, struct svc_export, h);
684 struct svc_export *item = container_of(citem, struct svc_export, h);
687 new->ex_flags = item->ex_flags;
688 new->ex_anon_uid = item->ex_anon_uid;
689 new->ex_anon_gid = item->ex_anon_gid;
690 new->ex_fsid = item->ex_fsid;
691 new->ex_uuid = item->ex_uuid;
692 item->ex_uuid = NULL;
693 new->ex_pathname = item->ex_pathname;
694 item->ex_pathname = NULL;
695 new->ex_fslocs.locations = item->ex_fslocs.locations;
696 item->ex_fslocs.locations = NULL;
697 new->ex_fslocs.locations_count = item->ex_fslocs.locations_count;
698 item->ex_fslocs.locations_count = 0;
699 new->ex_fslocs.migrated = item->ex_fslocs.migrated;
700 item->ex_fslocs.migrated = 0;
701 new->ex_nflavors = item->ex_nflavors;
702 for (i = 0; i < MAX_SECINFO_LIST; i++) {
703 new->ex_flavors[i] = item->ex_flavors[i];
707 static struct cache_head *svc_export_alloc(void)
709 struct svc_export *i = kmalloc(sizeof(*i), GFP_KERNEL);
716 struct cache_detail svc_export_cache = {
717 .owner = THIS_MODULE,
718 .hash_size = EXPORT_HASHMAX,
719 .hash_table = export_table,
720 .name = "nfsd.export",
721 .cache_put = svc_export_put,
722 .cache_upcall = svc_export_upcall,
723 .cache_parse = svc_export_parse,
724 .cache_show = svc_export_show,
725 .match = svc_export_match,
726 .init = svc_export_init,
727 .update = export_update,
728 .alloc = svc_export_alloc,
731 static struct svc_export *
732 svc_export_lookup(struct svc_export *exp)
734 struct cache_head *ch;
736 hash = hash_ptr(exp->ex_client, EXPORT_HASHBITS);
737 hash ^= hash_ptr(exp->ex_path.dentry, EXPORT_HASHBITS);
738 hash ^= hash_ptr(exp->ex_path.mnt, EXPORT_HASHBITS);
740 ch = sunrpc_cache_lookup(&svc_export_cache, &exp->h,
743 return container_of(ch, struct svc_export, h);
748 static struct svc_export *
749 svc_export_update(struct svc_export *new, struct svc_export *old)
751 struct cache_head *ch;
753 hash = hash_ptr(old->ex_client, EXPORT_HASHBITS);
754 hash ^= hash_ptr(old->ex_path.dentry, EXPORT_HASHBITS);
755 hash ^= hash_ptr(old->ex_path.mnt, EXPORT_HASHBITS);
757 ch = sunrpc_cache_update(&svc_export_cache, &new->h,
761 return container_of(ch, struct svc_export, h);
767 static struct svc_expkey *
768 exp_find_key(svc_client *clp, int fsid_type, u32 *fsidv, struct cache_req *reqp)
770 struct svc_expkey key, *ek;
774 return ERR_PTR(-ENOENT);
777 key.ek_fsidtype = fsid_type;
778 memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
780 ek = svc_expkey_lookup(&key);
782 return ERR_PTR(-ENOMEM);
783 err = cache_check(&svc_expkey_cache, &ek->h, reqp);
789 static int exp_set_key(svc_client *clp, int fsid_type, u32 *fsidv,
790 struct svc_export *exp)
792 struct svc_expkey key, *ek;
795 key.ek_fsidtype = fsid_type;
796 memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
797 key.ek_path = exp->ex_path;
798 key.h.expiry_time = NEVER;
801 ek = svc_expkey_lookup(&key);
803 ek = svc_expkey_update(&key,ek);
805 cache_put(&ek->h, &svc_expkey_cache);
812 * Find the client's export entry matching xdev/xino.
814 static inline struct svc_expkey *
815 exp_get_key(svc_client *clp, dev_t dev, ino_t ino)
819 if (old_valid_dev(dev)) {
820 mk_fsid(FSID_DEV, fsidv, dev, ino, 0, NULL);
821 return exp_find_key(clp, FSID_DEV, fsidv, NULL);
823 mk_fsid(FSID_ENCODE_DEV, fsidv, dev, ino, 0, NULL);
824 return exp_find_key(clp, FSID_ENCODE_DEV, fsidv, NULL);
828 * Find the client's export entry matching fsid
830 static inline struct svc_expkey *
831 exp_get_fsid_key(svc_client *clp, int fsid)
835 mk_fsid(FSID_NUM, fsidv, 0, 0, fsid, NULL);
837 return exp_find_key(clp, FSID_NUM, fsidv, NULL);
840 static svc_export *exp_get_by_name(svc_client *clp, const struct path *path,
841 struct cache_req *reqp)
843 struct svc_export *exp, key;
847 return ERR_PTR(-ENOENT);
852 exp = svc_export_lookup(&key);
854 return ERR_PTR(-ENOMEM);
855 err = cache_check(&svc_export_cache, &exp->h, reqp);
862 * Find the export entry for a given dentry.
864 static struct svc_export *exp_parent(svc_client *clp, struct path *path)
866 struct dentry *saved = dget(path->dentry);
867 svc_export *exp = exp_get_by_name(clp, path, NULL);
869 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) {
870 struct dentry *parent = dget_parent(path->dentry);
872 path->dentry = parent;
873 exp = exp_get_by_name(clp, path, NULL);
876 path->dentry = saved;
881 * Hashtable locking. Write locks are placed only by user processes
882 * wanting to modify export information.
883 * Write locking only done in this file. Read locking
887 static DECLARE_RWSEM(hash_sem);
892 down_read(&hash_sem);
898 down_write(&hash_sem);
908 exp_writeunlock(void)
913 static void exp_fsid_unhash(struct svc_export *exp)
915 struct svc_expkey *ek;
917 if ((exp->ex_flags & NFSEXP_FSID) == 0)
920 ek = exp_get_fsid_key(exp->ex_client, exp->ex_fsid);
922 ek->h.expiry_time = get_seconds()-1;
923 cache_put(&ek->h, &svc_expkey_cache);
925 svc_expkey_cache.nextcheck = get_seconds();
928 static int exp_fsid_hash(svc_client *clp, struct svc_export *exp)
932 if ((exp->ex_flags & NFSEXP_FSID) == 0)
935 mk_fsid(FSID_NUM, fsid, 0, 0, exp->ex_fsid, NULL);
936 return exp_set_key(clp, FSID_NUM, fsid, exp);
939 static int exp_hash(struct auth_domain *clp, struct svc_export *exp)
942 struct inode *inode = exp->ex_path.dentry->d_inode;
943 dev_t dev = inode->i_sb->s_dev;
945 if (old_valid_dev(dev)) {
946 mk_fsid(FSID_DEV, fsid, dev, inode->i_ino, 0, NULL);
947 return exp_set_key(clp, FSID_DEV, fsid, exp);
949 mk_fsid(FSID_ENCODE_DEV, fsid, dev, inode->i_ino, 0, NULL);
950 return exp_set_key(clp, FSID_ENCODE_DEV, fsid, exp);
953 static void exp_unhash(struct svc_export *exp)
955 struct svc_expkey *ek;
956 struct inode *inode = exp->ex_path.dentry->d_inode;
958 ek = exp_get_key(exp->ex_client, inode->i_sb->s_dev, inode->i_ino);
960 ek->h.expiry_time = get_seconds()-1;
961 cache_put(&ek->h, &svc_expkey_cache);
963 svc_expkey_cache.nextcheck = get_seconds();
967 * Export a file system.
970 exp_export(struct nfsctl_export *nxp)
973 struct svc_export *exp = NULL;
974 struct svc_export new;
975 struct svc_expkey *fsid_key = NULL;
979 /* Consistency check */
981 if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) ||
982 !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX))
985 dprintk("exp_export called for %s:%s (%x/%ld fl %x).\n",
986 nxp->ex_client, nxp->ex_path,
987 (unsigned)nxp->ex_dev, (long)nxp->ex_ino,
990 /* Try to lock the export table for update */
993 /* Look up client info */
994 if (!(clp = auth_domain_find(nxp->ex_client)))
998 /* Look up the dentry */
999 err = kern_path(nxp->ex_path, 0, &path);
1004 exp = exp_get_by_name(clp, &path, NULL);
1006 memset(&new, 0, sizeof(new));
1008 /* must make sure there won't be an ex_fsid clash */
1009 if ((nxp->ex_flags & NFSEXP_FSID) &&
1010 (!IS_ERR(fsid_key = exp_get_fsid_key(clp, nxp->ex_dev))) &&
1011 fsid_key->ek_path.mnt &&
1012 (fsid_key->ek_path.mnt != path.mnt ||
1013 fsid_key->ek_path.dentry != path.dentry))
1017 /* just a flags/id/fsid update */
1019 exp_fsid_unhash(exp);
1020 exp->ex_flags = nxp->ex_flags;
1021 exp->ex_anon_uid = nxp->ex_anon_uid;
1022 exp->ex_anon_gid = nxp->ex_anon_gid;
1023 exp->ex_fsid = nxp->ex_dev;
1025 err = exp_fsid_hash(clp, exp);
1029 err = check_export(path.dentry->d_inode, nxp->ex_flags, NULL);
1030 if (err) goto finish;
1034 dprintk("nfsd: creating export entry %p for client %p\n", exp, clp);
1036 new.h.expiry_time = NEVER;
1038 new.ex_pathname = kstrdup(nxp->ex_path, GFP_KERNEL);
1039 if (!new.ex_pathname)
1041 new.ex_client = clp;
1043 new.ex_flags = nxp->ex_flags;
1044 new.ex_anon_uid = nxp->ex_anon_uid;
1045 new.ex_anon_gid = nxp->ex_anon_gid;
1046 new.ex_fsid = nxp->ex_dev;
1048 exp = svc_export_lookup(&new);
1050 exp = svc_export_update(&new, exp);
1055 if (exp_hash(clp, exp) ||
1056 exp_fsid_hash(clp, exp)) {
1057 /* failed to create at least one index */
1058 exp_do_unexport(exp);
1063 kfree(new.ex_pathname);
1066 if (fsid_key && !IS_ERR(fsid_key))
1067 cache_put(&fsid_key->h, &svc_expkey_cache);
1070 auth_domain_put(clp);
1078 * Unexport a file system. The export entry has already
1079 * been removed from the client's list of exported fs's.
1082 exp_do_unexport(svc_export *unexp)
1084 unexp->h.expiry_time = get_seconds()-1;
1085 svc_export_cache.nextcheck = get_seconds();
1087 exp_fsid_unhash(unexp);
1095 exp_unexport(struct nfsctl_export *nxp)
1097 struct auth_domain *dom;
1102 /* Consistency check */
1103 if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) ||
1104 !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX))
1110 dom = auth_domain_find(nxp->ex_client);
1112 dprintk("nfsd: unexport couldn't find %s\n", nxp->ex_client);
1116 err = kern_path(nxp->ex_path, 0, &path);
1121 exp = exp_get_by_name(dom, &path, NULL);
1126 exp_do_unexport(exp);
1131 auth_domain_put(dom);
1139 * Obtain the root fh on behalf of a client.
1140 * This could be done in user space, but I feel that it adds some safety
1141 * since its harder to fool a kernel module than a user space program.
1144 exp_rootfh(svc_client *clp, char *name, struct knfsd_fh *f, int maxsize)
1146 struct svc_export *exp;
1148 struct inode *inode;
1153 /* NB: we probably ought to check that it's NUL-terminated */
1154 if (kern_path(name, 0, &path)) {
1155 printk("nfsd: exp_rootfh path not found %s", name);
1158 inode = path.dentry->d_inode;
1160 dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n",
1161 name, path.dentry, clp->name,
1162 inode->i_sb->s_id, inode->i_ino);
1163 exp = exp_parent(clp, &path);
1170 * fh must be initialized before calling fh_compose
1172 fh_init(&fh, maxsize);
1173 if (fh_compose(&fh, exp, path.dentry, NULL))
1177 memcpy(f, &fh.fh_handle, sizeof(struct knfsd_fh));
1185 static struct svc_export *exp_find(struct auth_domain *clp, int fsid_type,
1186 u32 *fsidv, struct cache_req *reqp)
1188 struct svc_export *exp;
1189 struct svc_expkey *ek = exp_find_key(clp, fsid_type, fsidv, reqp);
1191 return ERR_CAST(ek);
1193 exp = exp_get_by_name(clp, &ek->ek_path, reqp);
1194 cache_put(&ek->h, &svc_expkey_cache);
1197 return ERR_CAST(exp);
1201 __be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp)
1203 struct exp_flavor_info *f;
1204 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
1206 /* legacy gss-only clients are always OK: */
1207 if (exp->ex_client == rqstp->rq_gssclient)
1209 /* ip-address based client; check sec= export option: */
1210 for (f = exp->ex_flavors; f < end; f++) {
1211 if (f->pseudoflavor == rqstp->rq_flavor)
1214 /* defaults in absence of sec= options: */
1215 if (exp->ex_nflavors == 0) {
1216 if (rqstp->rq_flavor == RPC_AUTH_NULL ||
1217 rqstp->rq_flavor == RPC_AUTH_UNIX)
1220 return nfserr_wrongsec;
1224 * Uses rq_client and rq_gssclient to find an export; uses rq_client (an
1225 * auth_unix client) if it's available and has secinfo information;
1226 * otherwise, will try to use rq_gssclient.
1228 * Called from functions that handle requests; functions that do work on
1229 * behalf of mountd are passed a single client name to use, and should
1230 * use exp_get_by_name() or exp_find().
1233 rqst_exp_get_by_name(struct svc_rqst *rqstp, struct path *path)
1235 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
1237 if (rqstp->rq_client == NULL)
1240 /* First try the auth_unix client: */
1241 exp = exp_get_by_name(rqstp->rq_client, path, &rqstp->rq_chandle);
1242 if (PTR_ERR(exp) == -ENOENT)
1246 /* If it has secinfo, assume there are no gss/... clients */
1247 if (exp->ex_nflavors > 0)
1250 /* Otherwise, try falling back on gss client */
1251 if (rqstp->rq_gssclient == NULL)
1253 gssexp = exp_get_by_name(rqstp->rq_gssclient, path, &rqstp->rq_chandle);
1254 if (PTR_ERR(gssexp) == -ENOENT)
1262 rqst_exp_find(struct svc_rqst *rqstp, int fsid_type, u32 *fsidv)
1264 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
1266 if (rqstp->rq_client == NULL)
1269 /* First try the auth_unix client: */
1270 exp = exp_find(rqstp->rq_client, fsid_type, fsidv, &rqstp->rq_chandle);
1271 if (PTR_ERR(exp) == -ENOENT)
1275 /* If it has secinfo, assume there are no gss/... clients */
1276 if (exp->ex_nflavors > 0)
1279 /* Otherwise, try falling back on gss client */
1280 if (rqstp->rq_gssclient == NULL)
1282 gssexp = exp_find(rqstp->rq_gssclient, fsid_type, fsidv,
1283 &rqstp->rq_chandle);
1284 if (PTR_ERR(gssexp) == -ENOENT)
1292 rqst_exp_parent(struct svc_rqst *rqstp, struct path *path)
1294 struct dentry *saved = dget(path->dentry);
1295 struct svc_export *exp = rqst_exp_get_by_name(rqstp, path);
1297 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) {
1298 struct dentry *parent = dget_parent(path->dentry);
1300 path->dentry = parent;
1301 exp = rqst_exp_get_by_name(rqstp, path);
1304 path->dentry = saved;
1308 static struct svc_export *find_fsidzero_export(struct svc_rqst *rqstp)
1310 struct svc_export *exp;
1313 mk_fsid(FSID_NUM, fsidv, 0, 0, 0, NULL);
1315 exp = rqst_exp_find(rqstp, FSID_NUM, fsidv);
1317 * We shouldn't have accepting an nfsv4 request at all if we
1318 * don't have a pseudoexport!:
1320 if (IS_ERR(exp) && PTR_ERR(exp) == -ENOENT)
1321 exp = ERR_PTR(-ESERVERFAULT);
1326 * Called when we need the filehandle for the root of the pseudofs,
1327 * for a given NFSv4 client. The root is defined to be the
1328 * export point with fsid==0
1331 exp_pseudoroot(struct svc_rqst *rqstp, struct svc_fh *fhp)
1333 struct svc_export *exp;
1336 exp = find_fsidzero_export(rqstp);
1338 return nfserrno(PTR_ERR(exp));
1339 rv = fh_compose(fhp, exp, exp->ex_path.dentry, NULL);
1342 rv = check_nfsd_access(exp, rqstp);
1352 static void *e_start(struct seq_file *m, loff_t *pos)
1353 __acquires(svc_export_cache.hash_lock)
1356 unsigned hash, export;
1357 struct cache_head *ch;
1360 read_lock(&svc_export_cache.hash_lock);
1362 return SEQ_START_TOKEN;
1364 export = n & ((1LL<<32) - 1);
1367 for (ch=export_table[hash]; ch; ch=ch->next)
1370 n &= ~((1LL<<32) - 1);
1374 } while(hash < EXPORT_HASHMAX && export_table[hash]==NULL);
1375 if (hash >= EXPORT_HASHMAX)
1378 return export_table[hash];
1381 static void *e_next(struct seq_file *m, void *p, loff_t *pos)
1383 struct cache_head *ch = p;
1384 int hash = (*pos >> 32);
1386 if (p == SEQ_START_TOKEN)
1388 else if (ch->next == NULL) {
1395 *pos &= ~((1LL<<32) - 1);
1396 while (hash < EXPORT_HASHMAX && export_table[hash] == NULL) {
1400 if (hash >= EXPORT_HASHMAX)
1403 return export_table[hash];
1406 static void e_stop(struct seq_file *m, void *p)
1407 __releases(svc_export_cache.hash_lock)
1409 read_unlock(&svc_export_cache.hash_lock);
1413 static struct flags {
1417 { NFSEXP_READONLY, {"ro", "rw"}},
1418 { NFSEXP_INSECURE_PORT, {"insecure", ""}},
1419 { NFSEXP_ROOTSQUASH, {"root_squash", "no_root_squash"}},
1420 { NFSEXP_ALLSQUASH, {"all_squash", ""}},
1421 { NFSEXP_ASYNC, {"async", "sync"}},
1422 { NFSEXP_GATHERED_WRITES, {"wdelay", "no_wdelay"}},
1423 { NFSEXP_NOHIDE, {"nohide", ""}},
1424 { NFSEXP_CROSSMOUNT, {"crossmnt", ""}},
1425 { NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}},
1426 { NFSEXP_NOAUTHNLM, {"insecure_locks", ""}},
1428 { NFSEXP_MSNFS, {"msnfs", ""}},
1433 static void show_expflags(struct seq_file *m, int flags, int mask)
1436 int state, first = 0;
1438 for (flg = expflags; flg->flag; flg++) {
1439 if (flg->flag & ~mask)
1441 state = (flg->flag & flags) ? 0 : 1;
1442 if (*flg->name[state])
1443 seq_printf(m, "%s%s", first++?",":"", flg->name[state]);
1447 static void show_secinfo_flags(struct seq_file *m, int flags)
1450 show_expflags(m, flags, NFSEXP_SECINFO_FLAGS);
1453 static void show_secinfo(struct seq_file *m, struct svc_export *exp)
1455 struct exp_flavor_info *f;
1456 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
1457 int lastflags = 0, first = 0;
1459 if (exp->ex_nflavors == 0)
1461 for (f = exp->ex_flavors; f < end; f++) {
1462 if (first || f->flags != lastflags) {
1464 show_secinfo_flags(m, lastflags);
1465 seq_printf(m, ",sec=%d", f->pseudoflavor);
1466 lastflags = f->flags;
1468 seq_printf(m, ":%d", f->pseudoflavor);
1471 show_secinfo_flags(m, lastflags);
1474 static void exp_flags(struct seq_file *m, int flag, int fsid,
1475 uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fsloc)
1477 show_expflags(m, flag, NFSEXP_ALLFLAGS);
1478 if (flag & NFSEXP_FSID)
1479 seq_printf(m, ",fsid=%d", fsid);
1480 if (anonu != (uid_t)-2 && anonu != (0x10000-2))
1481 seq_printf(m, ",anonuid=%u", anonu);
1482 if (anong != (gid_t)-2 && anong != (0x10000-2))
1483 seq_printf(m, ",anongid=%u", anong);
1484 if (fsloc && fsloc->locations_count > 0) {
1485 char *loctype = (fsloc->migrated) ? "refer" : "replicas";
1488 seq_printf(m, ",%s=", loctype);
1489 seq_escape(m, fsloc->locations[0].path, ",;@ \t\n\\");
1491 seq_escape(m, fsloc->locations[0].hosts, ",;@ \t\n\\");
1492 for (i = 1; i < fsloc->locations_count; i++) {
1494 seq_escape(m, fsloc->locations[i].path, ",;@ \t\n\\");
1496 seq_escape(m, fsloc->locations[i].hosts, ",;@ \t\n\\");
1501 static int e_show(struct seq_file *m, void *p)
1503 struct cache_head *cp = p;
1504 struct svc_export *exp = container_of(cp, struct svc_export, h);
1506 if (p == SEQ_START_TOKEN) {
1507 seq_puts(m, "# Version 1.1\n");
1508 seq_puts(m, "# Path Client(Flags) # IPs\n");
1513 if (cache_check(&svc_export_cache, &exp->h, NULL))
1515 cache_put(&exp->h, &svc_export_cache);
1516 return svc_export_show(m, &svc_export_cache, cp);
1519 const struct seq_operations nfs_exports_op = {
1527 * Add or modify a client.
1528 * Change requests may involve the list of host addresses. The list of
1529 * exports and possibly existing uid maps are left untouched.
1532 exp_addclient(struct nfsctl_client *ncp)
1534 struct auth_domain *dom;
1536 struct in6_addr addr6;
1538 /* First, consistency check. */
1540 if (! exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX))
1542 if (ncp->cl_naddr > NFSCLNT_ADDRMAX)
1545 /* Lock the hashtable */
1548 dom = unix_domain_find(ncp->cl_ident);
1554 /* Insert client into hashtable. */
1555 for (i = 0; i < ncp->cl_naddr; i++) {
1556 ipv6_addr_set_v4mapped(ncp->cl_addrlist[i].s_addr, &addr6);
1557 auth_unix_add_addr(&addr6, dom);
1559 auth_unix_forget_old(dom);
1560 auth_domain_put(dom);
1571 * Delete a client given an identifier.
1574 exp_delclient(struct nfsctl_client *ncp)
1577 struct auth_domain *dom;
1580 if (!exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX))
1583 /* Lock the hashtable */
1586 dom = auth_domain_find(ncp->cl_ident);
1587 /* just make sure that no addresses work
1588 * and that it will expire soon
1591 err = auth_unix_forget_old(dom);
1592 auth_domain_put(dom);
1601 * Verify that string is non-empty and does not exceed max length.
1604 exp_verify_string(char *cp, int max)
1608 for (i = 0; i < max; i++)
1612 printk(KERN_NOTICE "nfsd: couldn't validate string %s\n", cp);
1617 * Initialize the exports module.
1620 nfsd_export_init(void)
1623 dprintk("nfsd: initializing export module.\n");
1625 rv = cache_register(&svc_export_cache);
1628 rv = cache_register(&svc_expkey_cache);
1630 cache_unregister(&svc_export_cache);
1636 * Flush exports table - called when last nfsd thread is killed
1639 nfsd_export_flush(void)
1642 cache_purge(&svc_expkey_cache);
1643 cache_purge(&svc_export_cache);
1648 * Shutdown the exports module.
1651 nfsd_export_shutdown(void)
1654 dprintk("nfsd: shutting down export module.\n");
1658 cache_unregister(&svc_expkey_cache);
1659 cache_unregister(&svc_export_cache);
1660 svcauth_unix_purge();
1663 dprintk("nfsd: export shutdown complete.\n");