2 * NFS exporting and validation.
4 * We maintain a list of clients, each of which has a list of
5 * exports. To export an fs to a given client, you first have
6 * to create the client entry with NFSCTL_ADDCLIENT, which
7 * creates a client control block and adds it to the hash
8 * table. Then, you call NFSCTL_EXPORT for each fs.
11 * Copyright (C) 1995, 1996 Olaf Kirch, <okir@monad.swb.de>
14 #include <linux/slab.h>
15 #include <linux/namei.h>
16 #include <linux/module.h>
17 #include <linux/exportfs.h>
19 #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;
32 * One maps client+vfsmnt+dentry to export options - the export map
33 * The other maps client+filehandle-fragment to export options. - the expkey map
35 * The export options are actually stored in the first map, and the
36 * second map contains a reference to the entry in the first map.
39 #define EXPKEY_HASHBITS 8
40 #define EXPKEY_HASHMAX (1 << EXPKEY_HASHBITS)
41 #define EXPKEY_HASHMASK (EXPKEY_HASHMAX -1)
42 static struct cache_head *expkey_table[EXPKEY_HASHMAX];
44 static void expkey_put(struct kref *ref)
46 struct svc_expkey *key = container_of(ref, struct svc_expkey, h.ref);
48 if (test_bit(CACHE_VALID, &key->h.flags) &&
49 !test_bit(CACHE_NEGATIVE, &key->h.flags))
50 path_put(&key->ek_path);
51 auth_domain_put(key->ek_client);
55 static void expkey_request(struct cache_detail *cd,
57 char **bpp, int *blen)
59 /* client fsidtype \xfsid */
60 struct svc_expkey *ek = container_of(h, struct svc_expkey, h);
63 qword_add(bpp, blen, ek->ek_client->name);
64 snprintf(type, 5, "%d", ek->ek_fsidtype);
65 qword_add(bpp, blen, type);
66 qword_addhex(bpp, blen, (char*)ek->ek_fsid, key_len(ek->ek_fsidtype));
70 static int expkey_upcall(struct cache_detail *cd, struct cache_head *h)
72 return sunrpc_cache_pipe_upcall(cd, h, expkey_request);
75 static struct svc_expkey *svc_expkey_update(struct svc_expkey *new, struct svc_expkey *old);
76 static struct svc_expkey *svc_expkey_lookup(struct svc_expkey *);
77 static struct cache_detail svc_expkey_cache;
79 static int expkey_parse(struct cache_detail *cd, char *mesg, int mlen)
81 /* client fsidtype fsid [path] */
84 struct auth_domain *dom = NULL;
88 struct svc_expkey key;
89 struct svc_expkey *ek = NULL;
91 if (mesg[mlen-1] != '\n')
95 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
101 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
105 dom = auth_domain_find(buf);
108 dprintk("found domain %s\n", buf);
111 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
113 fsidtype = simple_strtoul(buf, &ep, 10);
116 dprintk("found fsidtype %d\n", fsidtype);
117 if (key_len(fsidtype)==0) /* invalid type */
119 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
121 dprintk("found fsid length %d\n", len);
122 if (len != key_len(fsidtype))
125 /* OK, we seem to have a valid key */
127 key.h.expiry_time = get_expiry(&mesg);
128 if (key.h.expiry_time == 0)
132 key.ek_fsidtype = fsidtype;
133 memcpy(key.ek_fsid, buf, len);
135 ek = svc_expkey_lookup(&key);
140 /* now we want a pathname, or empty meaning NEGATIVE */
142 len = qword_get(&mesg, buf, PAGE_SIZE);
145 dprintk("Path seems to be <%s>\n", buf);
148 set_bit(CACHE_NEGATIVE, &key.h.flags);
149 ek = svc_expkey_update(&key, ek);
153 err = kern_path(buf, 0, &key.ek_path);
157 dprintk("Found the path %s\n", buf);
159 ek = svc_expkey_update(&key, ek);
162 path_put(&key.ek_path);
167 cache_put(&ek->h, &svc_expkey_cache);
169 auth_domain_put(dom);
174 static int expkey_show(struct seq_file *m,
175 struct cache_detail *cd,
176 struct cache_head *h)
178 struct svc_expkey *ek ;
182 seq_puts(m, "#domain fsidtype fsid [path]\n");
185 ek = container_of(h, struct svc_expkey, h);
186 seq_printf(m, "%s %d 0x", ek->ek_client->name,
188 for (i=0; i < key_len(ek->ek_fsidtype)/4; i++)
189 seq_printf(m, "%08x", ek->ek_fsid[i]);
190 if (test_bit(CACHE_VALID, &h->flags) &&
191 !test_bit(CACHE_NEGATIVE, &h->flags)) {
193 seq_path(m, &ek->ek_path, "\\ \t\n");
199 static inline int expkey_match (struct cache_head *a, struct cache_head *b)
201 struct svc_expkey *orig = container_of(a, struct svc_expkey, h);
202 struct svc_expkey *new = container_of(b, struct svc_expkey, h);
204 if (orig->ek_fsidtype != new->ek_fsidtype ||
205 orig->ek_client != new->ek_client ||
206 memcmp(orig->ek_fsid, new->ek_fsid, key_len(orig->ek_fsidtype)) != 0)
211 static inline void expkey_init(struct cache_head *cnew,
212 struct cache_head *citem)
214 struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
215 struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
217 kref_get(&item->ek_client->ref);
218 new->ek_client = item->ek_client;
219 new->ek_fsidtype = item->ek_fsidtype;
221 memcpy(new->ek_fsid, item->ek_fsid, sizeof(new->ek_fsid));
224 static inline void expkey_update(struct cache_head *cnew,
225 struct cache_head *citem)
227 struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
228 struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
230 new->ek_path = item->ek_path;
231 path_get(&item->ek_path);
234 static struct cache_head *expkey_alloc(void)
236 struct svc_expkey *i = kmalloc(sizeof(*i), GFP_KERNEL);
243 static struct cache_detail svc_expkey_cache = {
244 .owner = THIS_MODULE,
245 .hash_size = EXPKEY_HASHMAX,
246 .hash_table = expkey_table,
248 .cache_put = expkey_put,
249 .cache_upcall = expkey_upcall,
250 .cache_parse = expkey_parse,
251 .cache_show = expkey_show,
252 .match = expkey_match,
254 .update = expkey_update,
255 .alloc = expkey_alloc,
259 svc_expkey_hash(struct svc_expkey *item)
261 int hash = item->ek_fsidtype;
262 char * cp = (char*)item->ek_fsid;
263 int len = key_len(item->ek_fsidtype);
265 hash ^= hash_mem(cp, len, EXPKEY_HASHBITS);
266 hash ^= hash_ptr(item->ek_client, EXPKEY_HASHBITS);
267 hash &= EXPKEY_HASHMASK;
271 static struct svc_expkey *
272 svc_expkey_lookup(struct svc_expkey *item)
274 struct cache_head *ch;
275 int hash = svc_expkey_hash(item);
277 ch = sunrpc_cache_lookup(&svc_expkey_cache, &item->h,
280 return container_of(ch, struct svc_expkey, h);
285 static struct svc_expkey *
286 svc_expkey_update(struct svc_expkey *new, struct svc_expkey *old)
288 struct cache_head *ch;
289 int hash = svc_expkey_hash(new);
291 ch = sunrpc_cache_update(&svc_expkey_cache, &new->h,
294 return container_of(ch, struct svc_expkey, h);
300 #define EXPORT_HASHBITS 8
301 #define EXPORT_HASHMAX (1<< EXPORT_HASHBITS)
302 #define EXPORT_HASHMASK (EXPORT_HASHMAX -1)
304 static struct cache_head *export_table[EXPORT_HASHMAX];
306 static void nfsd4_fslocs_free(struct nfsd4_fs_locations *fsloc)
310 for (i = 0; i < fsloc->locations_count; i++) {
311 kfree(fsloc->locations[i].path);
312 kfree(fsloc->locations[i].hosts);
314 kfree(fsloc->locations);
317 static void svc_export_put(struct kref *ref)
319 struct svc_export *exp = container_of(ref, struct svc_export, h.ref);
320 path_put(&exp->ex_path);
321 auth_domain_put(exp->ex_client);
322 kfree(exp->ex_pathname);
323 nfsd4_fslocs_free(&exp->ex_fslocs);
327 static void svc_export_request(struct cache_detail *cd,
328 struct cache_head *h,
329 char **bpp, int *blen)
332 struct svc_export *exp = container_of(h, struct svc_export, h);
335 qword_add(bpp, blen, exp->ex_client->name);
336 pth = d_path(&exp->ex_path, *bpp, *blen);
338 /* is this correct? */
342 qword_add(bpp, blen, pth);
346 static int svc_export_upcall(struct cache_detail *cd, struct cache_head *h)
348 return sunrpc_cache_pipe_upcall(cd, h, svc_export_request);
351 static struct svc_export *svc_export_update(struct svc_export *new,
352 struct svc_export *old);
353 static struct svc_export *svc_export_lookup(struct svc_export *);
355 static int check_export(struct inode *inode, int *flags, unsigned char *uuid)
359 * We currently export only dirs, regular files, and (for v4
360 * pseudoroot) symlinks.
362 if (!S_ISDIR(inode->i_mode) &&
363 !S_ISLNK(inode->i_mode) &&
364 !S_ISREG(inode->i_mode))
368 * Mountd should never pass down a writeable V4ROOT export, but,
371 if (*flags & NFSEXP_V4ROOT)
372 *flags |= NFSEXP_READONLY;
374 /* There are two requirements on a filesystem to be exportable.
375 * 1: We must be able to identify the filesystem from a number.
376 * either a device number (so FS_REQUIRES_DEV needed)
377 * or an FSID number (so NFSEXP_FSID or ->uuid is needed).
378 * 2: We must be able to find an inode from a filehandle.
379 * This means that s_export_op must be set.
381 if (!(inode->i_sb->s_type->fs_flags & FS_REQUIRES_DEV) &&
382 !(*flags & NFSEXP_FSID) &&
384 dprintk("exp_export: export of non-dev fs without fsid\n");
388 if (!inode->i_sb->s_export_op ||
389 !inode->i_sb->s_export_op->fh_to_dentry) {
390 dprintk("exp_export: export of invalid fs type.\n");
398 #ifdef CONFIG_NFSD_V4
401 fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc)
404 int migrated, i, err;
407 err = get_int(mesg, &fsloc->locations_count);
410 if (fsloc->locations_count > MAX_FS_LOCATIONS)
412 if (fsloc->locations_count == 0)
415 fsloc->locations = kzalloc(fsloc->locations_count
416 * sizeof(struct nfsd4_fs_location), GFP_KERNEL);
417 if (!fsloc->locations)
419 for (i=0; i < fsloc->locations_count; i++) {
420 /* colon separated host list */
422 len = qword_get(mesg, buf, PAGE_SIZE);
426 fsloc->locations[i].hosts = kstrdup(buf, GFP_KERNEL);
427 if (!fsloc->locations[i].hosts)
430 /* slash separated path component list */
431 len = qword_get(mesg, buf, PAGE_SIZE);
435 fsloc->locations[i].path = kstrdup(buf, GFP_KERNEL);
436 if (!fsloc->locations[i].path)
440 err = get_int(mesg, &migrated);
444 if (migrated < 0 || migrated > 1)
446 fsloc->migrated = migrated;
449 nfsd4_fslocs_free(fsloc);
453 static int secinfo_parse(char **mesg, char *buf, struct svc_export *exp)
456 struct exp_flavor_info *f;
458 err = get_int(mesg, &listsize);
461 if (listsize < 0 || listsize > MAX_SECINFO_LIST)
464 for (f = exp->ex_flavors; f < exp->ex_flavors + listsize; f++) {
465 err = get_int(mesg, &f->pseudoflavor);
469 * XXX: It would be nice to also check whether this
470 * pseudoflavor is supported, so we can discover the
471 * problem at export time instead of when a client fails
474 err = get_int(mesg, &f->flags);
477 /* Only some flags are allowed to differ between flavors: */
478 if (~NFSEXP_SECINFO_FLAGS & (f->flags ^ exp->ex_flags))
481 exp->ex_nflavors = listsize;
485 #else /* CONFIG_NFSD_V4 */
487 fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc){return 0;}
489 secinfo_parse(char **mesg, char *buf, struct svc_export *exp) { return 0; }
492 static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen)
494 /* client path expiry [flags anonuid anongid fsid] */
498 struct auth_domain *dom = NULL;
499 struct svc_export exp = {}, *expp;
502 if (mesg[mlen-1] != '\n')
506 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
512 len = qword_get(&mesg, buf, PAGE_SIZE);
517 dom = auth_domain_find(buf);
523 if ((len = qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
526 err = kern_path(buf, 0, &exp.ex_path);
533 exp.ex_pathname = kstrdup(buf, GFP_KERNEL);
534 if (!exp.ex_pathname)
539 exp.h.expiry_time = get_expiry(&mesg);
540 if (exp.h.expiry_time == 0)
544 err = get_int(&mesg, &an_int);
545 if (err == -ENOENT) {
547 set_bit(CACHE_NEGATIVE, &exp.h.flags);
549 if (err || an_int < 0)
551 exp.ex_flags= an_int;
554 err = get_int(&mesg, &an_int);
557 exp.ex_anon_uid= an_int;
560 err = get_int(&mesg, &an_int);
563 exp.ex_anon_gid= an_int;
566 err = get_int(&mesg, &an_int);
569 exp.ex_fsid = an_int;
571 while ((len = qword_get(&mesg, buf, PAGE_SIZE)) > 0) {
572 if (strcmp(buf, "fsloc") == 0)
573 err = fsloc_parse(&mesg, buf, &exp.ex_fslocs);
574 else if (strcmp(buf, "uuid") == 0) {
575 /* expect a 16 byte uuid encoded as \xXXXX... */
576 len = qword_get(&mesg, buf, PAGE_SIZE);
581 kmemdup(buf, 16, GFP_KERNEL);
582 if (exp.ex_uuid == NULL)
585 } else if (strcmp(buf, "secinfo") == 0)
586 err = secinfo_parse(&mesg, buf, &exp);
588 /* quietly ignore unknown words and anything
589 * following. Newer user-space can try to set
590 * new values, then see what the result was.
597 err = check_export(exp.ex_path.dentry->d_inode, &exp.ex_flags,
603 expp = svc_export_lookup(&exp);
605 expp = svc_export_update(&exp, expp);
614 nfsd4_fslocs_free(&exp.ex_fslocs);
617 kfree(exp.ex_pathname);
619 path_put(&exp.ex_path);
621 auth_domain_put(dom);
627 static void exp_flags(struct seq_file *m, int flag, int fsid,
628 uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fslocs);
629 static void show_secinfo(struct seq_file *m, struct svc_export *exp);
631 static int svc_export_show(struct seq_file *m,
632 struct cache_detail *cd,
633 struct cache_head *h)
635 struct svc_export *exp ;
638 seq_puts(m, "#path domain(flags)\n");
641 exp = container_of(h, struct svc_export, h);
642 seq_path(m, &exp->ex_path, " \t\n\\");
644 seq_escape(m, exp->ex_client->name, " \t\n\\");
646 if (test_bit(CACHE_VALID, &h->flags) &&
647 !test_bit(CACHE_NEGATIVE, &h->flags)) {
648 exp_flags(m, exp->ex_flags, exp->ex_fsid,
649 exp->ex_anon_uid, exp->ex_anon_gid, &exp->ex_fslocs);
652 seq_puts(m, ",uuid=");
653 for (i=0; i<16; i++) {
656 seq_printf(m, "%02x", exp->ex_uuid[i]);
659 show_secinfo(m, exp);
664 static int svc_export_match(struct cache_head *a, struct cache_head *b)
666 struct svc_export *orig = container_of(a, struct svc_export, h);
667 struct svc_export *new = container_of(b, struct svc_export, h);
668 return orig->ex_client == new->ex_client &&
669 orig->ex_path.dentry == new->ex_path.dentry &&
670 orig->ex_path.mnt == new->ex_path.mnt;
673 static void svc_export_init(struct cache_head *cnew, struct cache_head *citem)
675 struct svc_export *new = container_of(cnew, struct svc_export, h);
676 struct svc_export *item = container_of(citem, struct svc_export, h);
678 kref_get(&item->ex_client->ref);
679 new->ex_client = item->ex_client;
680 new->ex_path.dentry = dget(item->ex_path.dentry);
681 new->ex_path.mnt = mntget(item->ex_path.mnt);
682 new->ex_pathname = NULL;
683 new->ex_fslocs.locations = NULL;
684 new->ex_fslocs.locations_count = 0;
685 new->ex_fslocs.migrated = 0;
688 static void export_update(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);
694 new->ex_flags = item->ex_flags;
695 new->ex_anon_uid = item->ex_anon_uid;
696 new->ex_anon_gid = item->ex_anon_gid;
697 new->ex_fsid = item->ex_fsid;
698 new->ex_uuid = item->ex_uuid;
699 item->ex_uuid = NULL;
700 new->ex_pathname = item->ex_pathname;
701 item->ex_pathname = NULL;
702 new->ex_fslocs.locations = item->ex_fslocs.locations;
703 item->ex_fslocs.locations = NULL;
704 new->ex_fslocs.locations_count = item->ex_fslocs.locations_count;
705 item->ex_fslocs.locations_count = 0;
706 new->ex_fslocs.migrated = item->ex_fslocs.migrated;
707 item->ex_fslocs.migrated = 0;
708 new->ex_nflavors = item->ex_nflavors;
709 for (i = 0; i < MAX_SECINFO_LIST; i++) {
710 new->ex_flavors[i] = item->ex_flavors[i];
714 static struct cache_head *svc_export_alloc(void)
716 struct svc_export *i = kmalloc(sizeof(*i), GFP_KERNEL);
723 struct cache_detail svc_export_cache = {
724 .owner = THIS_MODULE,
725 .hash_size = EXPORT_HASHMAX,
726 .hash_table = export_table,
727 .name = "nfsd.export",
728 .cache_put = svc_export_put,
729 .cache_upcall = svc_export_upcall,
730 .cache_parse = svc_export_parse,
731 .cache_show = svc_export_show,
732 .match = svc_export_match,
733 .init = svc_export_init,
734 .update = export_update,
735 .alloc = svc_export_alloc,
739 svc_export_hash(struct svc_export *exp)
743 hash = hash_ptr(exp->ex_client, EXPORT_HASHBITS);
744 hash ^= hash_ptr(exp->ex_path.dentry, EXPORT_HASHBITS);
745 hash ^= hash_ptr(exp->ex_path.mnt, EXPORT_HASHBITS);
749 static struct svc_export *
750 svc_export_lookup(struct svc_export *exp)
752 struct cache_head *ch;
753 int hash = svc_export_hash(exp);
755 ch = sunrpc_cache_lookup(&svc_export_cache, &exp->h,
758 return container_of(ch, struct svc_export, h);
763 static struct svc_export *
764 svc_export_update(struct svc_export *new, struct svc_export *old)
766 struct cache_head *ch;
767 int hash = svc_export_hash(old);
769 ch = sunrpc_cache_update(&svc_export_cache, &new->h,
773 return container_of(ch, struct svc_export, h);
779 static struct svc_expkey *
780 exp_find_key(svc_client *clp, int fsid_type, u32 *fsidv, struct cache_req *reqp)
782 struct svc_expkey key, *ek;
786 return ERR_PTR(-ENOENT);
789 key.ek_fsidtype = fsid_type;
790 memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
792 ek = svc_expkey_lookup(&key);
794 return ERR_PTR(-ENOMEM);
795 err = cache_check(&svc_expkey_cache, &ek->h, reqp);
801 #ifdef CONFIG_NFSD_DEPRECATED
802 static int exp_set_key(svc_client *clp, int fsid_type, u32 *fsidv,
803 struct svc_export *exp)
805 struct svc_expkey key, *ek;
808 key.ek_fsidtype = fsid_type;
809 memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
810 key.ek_path = exp->ex_path;
811 key.h.expiry_time = NEVER;
814 ek = svc_expkey_lookup(&key);
816 ek = svc_expkey_update(&key,ek);
818 cache_put(&ek->h, &svc_expkey_cache);
825 * Find the client's export entry matching xdev/xino.
827 static inline struct svc_expkey *
828 exp_get_key(svc_client *clp, dev_t dev, ino_t ino)
832 if (old_valid_dev(dev)) {
833 mk_fsid(FSID_DEV, fsidv, dev, ino, 0, NULL);
834 return exp_find_key(clp, FSID_DEV, fsidv, NULL);
836 mk_fsid(FSID_ENCODE_DEV, fsidv, dev, ino, 0, NULL);
837 return exp_find_key(clp, FSID_ENCODE_DEV, fsidv, NULL);
841 * Find the client's export entry matching fsid
843 static inline struct svc_expkey *
844 exp_get_fsid_key(svc_client *clp, int fsid)
848 mk_fsid(FSID_NUM, fsidv, 0, 0, fsid, NULL);
850 return exp_find_key(clp, FSID_NUM, fsidv, NULL);
854 static svc_export *exp_get_by_name(svc_client *clp, const struct path *path,
855 struct cache_req *reqp)
857 struct svc_export *exp, key;
861 return ERR_PTR(-ENOENT);
866 exp = svc_export_lookup(&key);
868 return ERR_PTR(-ENOMEM);
869 err = cache_check(&svc_export_cache, &exp->h, reqp);
876 * Find the export entry for a given dentry.
878 static struct svc_export *exp_parent(svc_client *clp, struct path *path)
880 struct dentry *saved = dget(path->dentry);
881 svc_export *exp = exp_get_by_name(clp, path, NULL);
883 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) {
884 struct dentry *parent = dget_parent(path->dentry);
886 path->dentry = parent;
887 exp = exp_get_by_name(clp, path, NULL);
890 path->dentry = saved;
894 #ifdef CONFIG_NFSD_DEPRECATED
896 * Hashtable locking. Write locks are placed only by user processes
897 * wanting to modify export information.
898 * Write locking only done in this file. Read locking
902 static DECLARE_RWSEM(hash_sem);
907 down_read(&hash_sem);
913 down_write(&hash_sem);
923 exp_writeunlock(void)
929 /* hash_sem not needed once deprecated interface is removed */
930 void exp_readlock(void) {}
931 static inline void exp_writelock(void){}
932 void exp_readunlock(void) {}
933 static inline void exp_writeunlock(void){}
937 #ifdef CONFIG_NFSD_DEPRECATED
938 static void exp_do_unexport(svc_export *unexp);
939 static int exp_verify_string(char *cp, int max);
941 static void exp_fsid_unhash(struct svc_export *exp)
943 struct svc_expkey *ek;
945 if ((exp->ex_flags & NFSEXP_FSID) == 0)
948 ek = exp_get_fsid_key(exp->ex_client, exp->ex_fsid);
950 sunrpc_invalidate(&ek->h, &svc_expkey_cache);
951 cache_put(&ek->h, &svc_expkey_cache);
955 static int exp_fsid_hash(svc_client *clp, struct svc_export *exp)
959 if ((exp->ex_flags & NFSEXP_FSID) == 0)
962 mk_fsid(FSID_NUM, fsid, 0, 0, exp->ex_fsid, NULL);
963 return exp_set_key(clp, FSID_NUM, fsid, exp);
966 static int exp_hash(struct auth_domain *clp, struct svc_export *exp)
969 struct inode *inode = exp->ex_path.dentry->d_inode;
970 dev_t dev = inode->i_sb->s_dev;
972 if (old_valid_dev(dev)) {
973 mk_fsid(FSID_DEV, fsid, dev, inode->i_ino, 0, NULL);
974 return exp_set_key(clp, FSID_DEV, fsid, exp);
976 mk_fsid(FSID_ENCODE_DEV, fsid, dev, inode->i_ino, 0, NULL);
977 return exp_set_key(clp, FSID_ENCODE_DEV, fsid, exp);
980 static void exp_unhash(struct svc_export *exp)
982 struct svc_expkey *ek;
983 struct inode *inode = exp->ex_path.dentry->d_inode;
985 ek = exp_get_key(exp->ex_client, inode->i_sb->s_dev, inode->i_ino);
987 sunrpc_invalidate(&ek->h, &svc_expkey_cache);
988 cache_put(&ek->h, &svc_expkey_cache);
993 * Export a file system.
996 exp_export(struct nfsctl_export *nxp)
999 struct svc_export *exp = NULL;
1000 struct svc_export new;
1001 struct svc_expkey *fsid_key = NULL;
1005 /* Consistency check */
1007 if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) ||
1008 !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX))
1011 dprintk("exp_export called for %s:%s (%x/%ld fl %x).\n",
1012 nxp->ex_client, nxp->ex_path,
1013 (unsigned)nxp->ex_dev, (long)nxp->ex_ino,
1016 /* Try to lock the export table for update */
1019 /* Look up client info */
1020 if (!(clp = auth_domain_find(nxp->ex_client)))
1024 /* Look up the dentry */
1025 err = kern_path(nxp->ex_path, 0, &path);
1030 exp = exp_get_by_name(clp, &path, NULL);
1032 memset(&new, 0, sizeof(new));
1034 /* must make sure there won't be an ex_fsid clash */
1035 if ((nxp->ex_flags & NFSEXP_FSID) &&
1036 (!IS_ERR(fsid_key = exp_get_fsid_key(clp, nxp->ex_dev))) &&
1037 fsid_key->ek_path.mnt &&
1038 (fsid_key->ek_path.mnt != path.mnt ||
1039 fsid_key->ek_path.dentry != path.dentry))
1043 /* just a flags/id/fsid update */
1045 exp_fsid_unhash(exp);
1046 exp->ex_flags = nxp->ex_flags;
1047 exp->ex_anon_uid = nxp->ex_anon_uid;
1048 exp->ex_anon_gid = nxp->ex_anon_gid;
1049 exp->ex_fsid = nxp->ex_dev;
1051 err = exp_fsid_hash(clp, exp);
1055 err = check_export(path.dentry->d_inode, &nxp->ex_flags, NULL);
1056 if (err) goto finish;
1060 dprintk("nfsd: creating export entry %p for client %p\n", exp, clp);
1062 new.h.expiry_time = NEVER;
1064 new.ex_pathname = kstrdup(nxp->ex_path, GFP_KERNEL);
1065 if (!new.ex_pathname)
1067 new.ex_client = clp;
1069 new.ex_flags = nxp->ex_flags;
1070 new.ex_anon_uid = nxp->ex_anon_uid;
1071 new.ex_anon_gid = nxp->ex_anon_gid;
1072 new.ex_fsid = nxp->ex_dev;
1074 exp = svc_export_lookup(&new);
1076 exp = svc_export_update(&new, exp);
1081 if (exp_hash(clp, exp) ||
1082 exp_fsid_hash(clp, exp)) {
1083 /* failed to create at least one index */
1084 exp_do_unexport(exp);
1089 kfree(new.ex_pathname);
1090 if (!IS_ERR_OR_NULL(exp))
1092 if (!IS_ERR_OR_NULL(fsid_key))
1093 cache_put(&fsid_key->h, &svc_expkey_cache);
1096 auth_domain_put(clp);
1104 * Unexport a file system. The export entry has already
1105 * been removed from the client's list of exported fs's.
1108 exp_do_unexport(svc_export *unexp)
1110 sunrpc_invalidate(&unexp->h, &svc_export_cache);
1112 exp_fsid_unhash(unexp);
1120 exp_unexport(struct nfsctl_export *nxp)
1122 struct auth_domain *dom;
1127 /* Consistency check */
1128 if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) ||
1129 !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX))
1135 dom = auth_domain_find(nxp->ex_client);
1137 dprintk("nfsd: unexport couldn't find %s\n", nxp->ex_client);
1141 err = kern_path(nxp->ex_path, 0, &path);
1146 exp = exp_get_by_name(dom, &path, NULL);
1151 exp_do_unexport(exp);
1156 auth_domain_put(dom);
1162 #endif /* CONFIG_NFSD_DEPRECATED */
1165 * Obtain the root fh on behalf of a client.
1166 * This could be done in user space, but I feel that it adds some safety
1167 * since its harder to fool a kernel module than a user space program.
1170 exp_rootfh(svc_client *clp, char *name, struct knfsd_fh *f, int maxsize)
1172 struct svc_export *exp;
1174 struct inode *inode;
1179 /* NB: we probably ought to check that it's NUL-terminated */
1180 if (kern_path(name, 0, &path)) {
1181 printk("nfsd: exp_rootfh path not found %s", name);
1184 inode = path.dentry->d_inode;
1186 dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n",
1187 name, path.dentry, clp->name,
1188 inode->i_sb->s_id, inode->i_ino);
1189 exp = exp_parent(clp, &path);
1196 * fh must be initialized before calling fh_compose
1198 fh_init(&fh, maxsize);
1199 if (fh_compose(&fh, exp, path.dentry, NULL))
1203 memcpy(f, &fh.fh_handle, sizeof(struct knfsd_fh));
1211 static struct svc_export *exp_find(struct auth_domain *clp, int fsid_type,
1212 u32 *fsidv, struct cache_req *reqp)
1214 struct svc_export *exp;
1215 struct svc_expkey *ek = exp_find_key(clp, fsid_type, fsidv, reqp);
1217 return ERR_CAST(ek);
1219 exp = exp_get_by_name(clp, &ek->ek_path, reqp);
1220 cache_put(&ek->h, &svc_expkey_cache);
1223 return ERR_CAST(exp);
1227 __be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp)
1229 struct exp_flavor_info *f;
1230 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
1232 /* legacy gss-only clients are always OK: */
1233 if (exp->ex_client == rqstp->rq_gssclient)
1235 /* ip-address based client; check sec= export option: */
1236 for (f = exp->ex_flavors; f < end; f++) {
1237 if (f->pseudoflavor == rqstp->rq_flavor)
1240 /* defaults in absence of sec= options: */
1241 if (exp->ex_nflavors == 0) {
1242 if (rqstp->rq_flavor == RPC_AUTH_NULL ||
1243 rqstp->rq_flavor == RPC_AUTH_UNIX)
1246 return nfserr_wrongsec;
1250 * Uses rq_client and rq_gssclient to find an export; uses rq_client (an
1251 * auth_unix client) if it's available and has secinfo information;
1252 * otherwise, will try to use rq_gssclient.
1254 * Called from functions that handle requests; functions that do work on
1255 * behalf of mountd are passed a single client name to use, and should
1256 * use exp_get_by_name() or exp_find().
1259 rqst_exp_get_by_name(struct svc_rqst *rqstp, struct path *path)
1261 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
1263 if (rqstp->rq_client == NULL)
1266 /* First try the auth_unix client: */
1267 exp = exp_get_by_name(rqstp->rq_client, path, &rqstp->rq_chandle);
1268 if (PTR_ERR(exp) == -ENOENT)
1272 /* If it has secinfo, assume there are no gss/... clients */
1273 if (exp->ex_nflavors > 0)
1276 /* Otherwise, try falling back on gss client */
1277 if (rqstp->rq_gssclient == NULL)
1279 gssexp = exp_get_by_name(rqstp->rq_gssclient, path, &rqstp->rq_chandle);
1280 if (PTR_ERR(gssexp) == -ENOENT)
1288 rqst_exp_find(struct svc_rqst *rqstp, int fsid_type, u32 *fsidv)
1290 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
1292 if (rqstp->rq_client == NULL)
1295 /* First try the auth_unix client: */
1296 exp = exp_find(rqstp->rq_client, fsid_type, fsidv, &rqstp->rq_chandle);
1297 if (PTR_ERR(exp) == -ENOENT)
1301 /* If it has secinfo, assume there are no gss/... clients */
1302 if (exp->ex_nflavors > 0)
1305 /* Otherwise, try falling back on gss client */
1306 if (rqstp->rq_gssclient == NULL)
1308 gssexp = exp_find(rqstp->rq_gssclient, fsid_type, fsidv,
1309 &rqstp->rq_chandle);
1310 if (PTR_ERR(gssexp) == -ENOENT)
1318 rqst_exp_parent(struct svc_rqst *rqstp, struct path *path)
1320 struct dentry *saved = dget(path->dentry);
1321 struct svc_export *exp = rqst_exp_get_by_name(rqstp, path);
1323 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) {
1324 struct dentry *parent = dget_parent(path->dentry);
1326 path->dentry = parent;
1327 exp = rqst_exp_get_by_name(rqstp, path);
1330 path->dentry = saved;
1334 static struct svc_export *find_fsidzero_export(struct svc_rqst *rqstp)
1338 mk_fsid(FSID_NUM, fsidv, 0, 0, 0, NULL);
1340 return rqst_exp_find(rqstp, FSID_NUM, fsidv);
1344 * Called when we need the filehandle for the root of the pseudofs,
1345 * for a given NFSv4 client. The root is defined to be the
1346 * export point with fsid==0
1349 exp_pseudoroot(struct svc_rqst *rqstp, struct svc_fh *fhp)
1351 struct svc_export *exp;
1354 exp = find_fsidzero_export(rqstp);
1356 return nfserrno(PTR_ERR(exp));
1357 rv = fh_compose(fhp, exp, exp->ex_path.dentry, NULL);
1360 rv = check_nfsd_access(exp, rqstp);
1370 static void *e_start(struct seq_file *m, loff_t *pos)
1371 __acquires(svc_export_cache.hash_lock)
1374 unsigned hash, export;
1375 struct cache_head *ch;
1378 read_lock(&svc_export_cache.hash_lock);
1380 return SEQ_START_TOKEN;
1382 export = n & ((1LL<<32) - 1);
1385 for (ch=export_table[hash]; ch; ch=ch->next)
1388 n &= ~((1LL<<32) - 1);
1392 } while(hash < EXPORT_HASHMAX && export_table[hash]==NULL);
1393 if (hash >= EXPORT_HASHMAX)
1396 return export_table[hash];
1399 static void *e_next(struct seq_file *m, void *p, loff_t *pos)
1401 struct cache_head *ch = p;
1402 int hash = (*pos >> 32);
1404 if (p == SEQ_START_TOKEN)
1406 else if (ch->next == NULL) {
1413 *pos &= ~((1LL<<32) - 1);
1414 while (hash < EXPORT_HASHMAX && export_table[hash] == NULL) {
1418 if (hash >= EXPORT_HASHMAX)
1421 return export_table[hash];
1424 static void e_stop(struct seq_file *m, void *p)
1425 __releases(svc_export_cache.hash_lock)
1427 read_unlock(&svc_export_cache.hash_lock);
1431 static struct flags {
1435 { NFSEXP_READONLY, {"ro", "rw"}},
1436 { NFSEXP_INSECURE_PORT, {"insecure", ""}},
1437 { NFSEXP_ROOTSQUASH, {"root_squash", "no_root_squash"}},
1438 { NFSEXP_ALLSQUASH, {"all_squash", ""}},
1439 { NFSEXP_ASYNC, {"async", "sync"}},
1440 { NFSEXP_GATHERED_WRITES, {"wdelay", "no_wdelay"}},
1441 { NFSEXP_NOHIDE, {"nohide", ""}},
1442 { NFSEXP_CROSSMOUNT, {"crossmnt", ""}},
1443 { NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}},
1444 { NFSEXP_NOAUTHNLM, {"insecure_locks", ""}},
1445 { NFSEXP_V4ROOT, {"v4root", ""}},
1449 static void show_expflags(struct seq_file *m, int flags, int mask)
1452 int state, first = 0;
1454 for (flg = expflags; flg->flag; flg++) {
1455 if (flg->flag & ~mask)
1457 state = (flg->flag & flags) ? 0 : 1;
1458 if (*flg->name[state])
1459 seq_printf(m, "%s%s", first++?",":"", flg->name[state]);
1463 static void show_secinfo_flags(struct seq_file *m, int flags)
1466 show_expflags(m, flags, NFSEXP_SECINFO_FLAGS);
1469 static bool secinfo_flags_equal(int f, int g)
1471 f &= NFSEXP_SECINFO_FLAGS;
1472 g &= NFSEXP_SECINFO_FLAGS;
1476 static int show_secinfo_run(struct seq_file *m, struct exp_flavor_info **fp, struct exp_flavor_info *end)
1480 flags = (*fp)->flags;
1481 seq_printf(m, ",sec=%d", (*fp)->pseudoflavor);
1483 while (*fp != end && secinfo_flags_equal(flags, (*fp)->flags)) {
1484 seq_printf(m, ":%d", (*fp)->pseudoflavor);
1490 static void show_secinfo(struct seq_file *m, struct svc_export *exp)
1492 struct exp_flavor_info *f;
1493 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
1496 if (exp->ex_nflavors == 0)
1498 f = exp->ex_flavors;
1499 flags = show_secinfo_run(m, &f, end);
1500 if (!secinfo_flags_equal(flags, exp->ex_flags))
1501 show_secinfo_flags(m, flags);
1503 flags = show_secinfo_run(m, &f, end);
1504 show_secinfo_flags(m, flags);
1508 static void exp_flags(struct seq_file *m, int flag, int fsid,
1509 uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fsloc)
1511 show_expflags(m, flag, NFSEXP_ALLFLAGS);
1512 if (flag & NFSEXP_FSID)
1513 seq_printf(m, ",fsid=%d", fsid);
1514 if (anonu != (uid_t)-2 && anonu != (0x10000-2))
1515 seq_printf(m, ",anonuid=%u", anonu);
1516 if (anong != (gid_t)-2 && anong != (0x10000-2))
1517 seq_printf(m, ",anongid=%u", anong);
1518 if (fsloc && fsloc->locations_count > 0) {
1519 char *loctype = (fsloc->migrated) ? "refer" : "replicas";
1522 seq_printf(m, ",%s=", loctype);
1523 seq_escape(m, fsloc->locations[0].path, ",;@ \t\n\\");
1525 seq_escape(m, fsloc->locations[0].hosts, ",;@ \t\n\\");
1526 for (i = 1; i < fsloc->locations_count; i++) {
1528 seq_escape(m, fsloc->locations[i].path, ",;@ \t\n\\");
1530 seq_escape(m, fsloc->locations[i].hosts, ",;@ \t\n\\");
1535 static int e_show(struct seq_file *m, void *p)
1537 struct cache_head *cp = p;
1538 struct svc_export *exp = container_of(cp, struct svc_export, h);
1540 if (p == SEQ_START_TOKEN) {
1541 seq_puts(m, "# Version 1.1\n");
1542 seq_puts(m, "# Path Client(Flags) # IPs\n");
1547 if (cache_check(&svc_export_cache, &exp->h, NULL))
1549 cache_put(&exp->h, &svc_export_cache);
1550 return svc_export_show(m, &svc_export_cache, cp);
1553 const struct seq_operations nfs_exports_op = {
1560 #ifdef CONFIG_NFSD_DEPRECATED
1562 * Add or modify a client.
1563 * Change requests may involve the list of host addresses. The list of
1564 * exports and possibly existing uid maps are left untouched.
1567 exp_addclient(struct nfsctl_client *ncp)
1569 struct auth_domain *dom;
1571 struct in6_addr addr6;
1573 /* First, consistency check. */
1575 if (! exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX))
1577 if (ncp->cl_naddr > NFSCLNT_ADDRMAX)
1580 /* Lock the hashtable */
1583 dom = unix_domain_find(ncp->cl_ident);
1589 /* Insert client into hashtable. */
1590 for (i = 0; i < ncp->cl_naddr; i++) {
1591 ipv6_addr_set_v4mapped(ncp->cl_addrlist[i].s_addr, &addr6);
1592 auth_unix_add_addr(&init_net, &addr6, dom);
1594 auth_unix_forget_old(dom);
1595 auth_domain_put(dom);
1606 * Delete a client given an identifier.
1609 exp_delclient(struct nfsctl_client *ncp)
1612 struct auth_domain *dom;
1615 if (!exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX))
1618 /* Lock the hashtable */
1621 dom = auth_domain_find(ncp->cl_ident);
1622 /* just make sure that no addresses work
1623 * and that it will expire soon
1626 err = auth_unix_forget_old(dom);
1627 auth_domain_put(dom);
1636 * Verify that string is non-empty and does not exceed max length.
1639 exp_verify_string(char *cp, int max)
1643 for (i = 0; i < max; i++)
1647 printk(KERN_NOTICE "nfsd: couldn't validate string %s\n", cp);
1650 #endif /* CONFIG_NFSD_DEPRECATED */
1653 * Initialize the exports module.
1656 nfsd_export_init(void)
1659 dprintk("nfsd: initializing export module.\n");
1661 rv = cache_register(&svc_export_cache);
1664 rv = cache_register(&svc_expkey_cache);
1666 cache_unregister(&svc_export_cache);
1672 * Flush exports table - called when last nfsd thread is killed
1675 nfsd_export_flush(void)
1678 cache_purge(&svc_expkey_cache);
1679 cache_purge(&svc_export_cache);
1684 * Shutdown the exports module.
1687 nfsd_export_shutdown(void)
1690 dprintk("nfsd: shutting down export module.\n");
1694 cache_unregister(&svc_expkey_cache);
1695 cache_unregister(&svc_export_cache);
1696 svcauth_unix_purge();
1699 dprintk("nfsd: export shutdown complete.\n");