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/syscall.h>
27 #define NFSDDBG_FACILITY NFSDDBG_EXPORT
29 typedef struct auth_domain svc_client;
30 typedef struct svc_export svc_export;
32 static void exp_do_unexport(svc_export *unexp);
33 static int exp_verify_string(char *cp, int max);
37 * One maps client+vfsmnt+dentry to export options - the export map
38 * The other maps client+filehandle-fragment to export options. - the expkey map
40 * The export options are actually stored in the first map, and the
41 * second map contains a reference to the entry in the first map.
44 #define EXPKEY_HASHBITS 8
45 #define EXPKEY_HASHMAX (1 << EXPKEY_HASHBITS)
46 #define EXPKEY_HASHMASK (EXPKEY_HASHMAX -1)
47 static struct cache_head *expkey_table[EXPKEY_HASHMAX];
49 static void expkey_put(struct kref *ref)
51 struct svc_expkey *key = container_of(ref, struct svc_expkey, h.ref);
53 if (test_bit(CACHE_VALID, &key->h.flags) &&
54 !test_bit(CACHE_NEGATIVE, &key->h.flags))
55 path_put(&key->ek_path);
56 auth_domain_put(key->ek_client);
60 static void expkey_request(struct cache_detail *cd,
62 char **bpp, int *blen)
64 /* client fsidtype \xfsid */
65 struct svc_expkey *ek = container_of(h, struct svc_expkey, h);
68 qword_add(bpp, blen, ek->ek_client->name);
69 snprintf(type, 5, "%d", ek->ek_fsidtype);
70 qword_add(bpp, blen, type);
71 qword_addhex(bpp, blen, (char*)ek->ek_fsid, key_len(ek->ek_fsidtype));
75 static int expkey_upcall(struct cache_detail *cd, struct cache_head *h)
77 return sunrpc_cache_pipe_upcall(cd, h, expkey_request);
80 static struct svc_expkey *svc_expkey_update(struct svc_expkey *new, struct svc_expkey *old);
81 static struct svc_expkey *svc_expkey_lookup(struct svc_expkey *);
82 static struct cache_detail svc_expkey_cache;
84 static int expkey_parse(struct cache_detail *cd, char *mesg, int mlen)
86 /* client fsidtype fsid [path] */
89 struct auth_domain *dom = NULL;
93 struct svc_expkey key;
94 struct svc_expkey *ek = NULL;
96 if (mesg[mlen-1] != '\n')
100 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
106 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
110 dom = auth_domain_find(buf);
113 dprintk("found domain %s\n", buf);
116 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
118 fsidtype = simple_strtoul(buf, &ep, 10);
121 dprintk("found fsidtype %d\n", fsidtype);
122 if (key_len(fsidtype)==0) /* invalid type */
124 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
126 dprintk("found fsid length %d\n", len);
127 if (len != key_len(fsidtype))
130 /* OK, we seem to have a valid key */
132 key.h.expiry_time = get_expiry(&mesg);
133 if (key.h.expiry_time == 0)
137 key.ek_fsidtype = fsidtype;
138 memcpy(key.ek_fsid, buf, len);
140 ek = svc_expkey_lookup(&key);
145 /* now we want a pathname, or empty meaning NEGATIVE */
147 len = qword_get(&mesg, buf, PAGE_SIZE);
150 dprintk("Path seems to be <%s>\n", buf);
153 set_bit(CACHE_NEGATIVE, &key.h.flags);
154 ek = svc_expkey_update(&key, ek);
158 err = kern_path(buf, 0, &key.ek_path);
162 dprintk("Found the path %s\n", buf);
164 ek = svc_expkey_update(&key, ek);
167 path_put(&key.ek_path);
172 cache_put(&ek->h, &svc_expkey_cache);
174 auth_domain_put(dom);
179 static int expkey_show(struct seq_file *m,
180 struct cache_detail *cd,
181 struct cache_head *h)
183 struct svc_expkey *ek ;
187 seq_puts(m, "#domain fsidtype fsid [path]\n");
190 ek = container_of(h, struct svc_expkey, h);
191 seq_printf(m, "%s %d 0x", ek->ek_client->name,
193 for (i=0; i < key_len(ek->ek_fsidtype)/4; i++)
194 seq_printf(m, "%08x", ek->ek_fsid[i]);
195 if (test_bit(CACHE_VALID, &h->flags) &&
196 !test_bit(CACHE_NEGATIVE, &h->flags)) {
198 seq_path(m, &ek->ek_path, "\\ \t\n");
204 static inline int expkey_match (struct cache_head *a, struct cache_head *b)
206 struct svc_expkey *orig = container_of(a, struct svc_expkey, h);
207 struct svc_expkey *new = container_of(b, struct svc_expkey, h);
209 if (orig->ek_fsidtype != new->ek_fsidtype ||
210 orig->ek_client != new->ek_client ||
211 memcmp(orig->ek_fsid, new->ek_fsid, key_len(orig->ek_fsidtype)) != 0)
216 static inline void expkey_init(struct cache_head *cnew,
217 struct cache_head *citem)
219 struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
220 struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
222 kref_get(&item->ek_client->ref);
223 new->ek_client = item->ek_client;
224 new->ek_fsidtype = item->ek_fsidtype;
226 memcpy(new->ek_fsid, item->ek_fsid, sizeof(new->ek_fsid));
229 static inline void expkey_update(struct cache_head *cnew,
230 struct cache_head *citem)
232 struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
233 struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
235 new->ek_path = item->ek_path;
236 path_get(&item->ek_path);
239 static struct cache_head *expkey_alloc(void)
241 struct svc_expkey *i = kmalloc(sizeof(*i), GFP_KERNEL);
248 static struct cache_detail svc_expkey_cache = {
249 .owner = THIS_MODULE,
250 .hash_size = EXPKEY_HASHMAX,
251 .hash_table = expkey_table,
253 .cache_put = expkey_put,
254 .cache_upcall = expkey_upcall,
255 .cache_parse = expkey_parse,
256 .cache_show = expkey_show,
257 .match = expkey_match,
259 .update = expkey_update,
260 .alloc = expkey_alloc,
263 static struct svc_expkey *
264 svc_expkey_lookup(struct svc_expkey *item)
266 struct cache_head *ch;
267 int hash = item->ek_fsidtype;
268 char * cp = (char*)item->ek_fsid;
269 int len = key_len(item->ek_fsidtype);
271 hash ^= hash_mem(cp, len, EXPKEY_HASHBITS);
272 hash ^= hash_ptr(item->ek_client, EXPKEY_HASHBITS);
273 hash &= EXPKEY_HASHMASK;
275 ch = sunrpc_cache_lookup(&svc_expkey_cache, &item->h,
278 return container_of(ch, struct svc_expkey, h);
283 static struct svc_expkey *
284 svc_expkey_update(struct svc_expkey *new, struct svc_expkey *old)
286 struct cache_head *ch;
287 int hash = new->ek_fsidtype;
288 char * cp = (char*)new->ek_fsid;
289 int len = key_len(new->ek_fsidtype);
291 hash ^= hash_mem(cp, len, EXPKEY_HASHBITS);
292 hash ^= hash_ptr(new->ek_client, EXPKEY_HASHBITS);
293 hash &= EXPKEY_HASHMASK;
295 ch = sunrpc_cache_update(&svc_expkey_cache, &new->h,
298 return container_of(ch, struct svc_expkey, h);
304 #define EXPORT_HASHBITS 8
305 #define EXPORT_HASHMAX (1<< EXPORT_HASHBITS)
306 #define EXPORT_HASHMASK (EXPORT_HASHMAX -1)
308 static struct cache_head *export_table[EXPORT_HASHMAX];
310 static void nfsd4_fslocs_free(struct nfsd4_fs_locations *fsloc)
314 for (i = 0; i < fsloc->locations_count; i++) {
315 kfree(fsloc->locations[i].path);
316 kfree(fsloc->locations[i].hosts);
318 kfree(fsloc->locations);
321 static void svc_export_put(struct kref *ref)
323 struct svc_export *exp = container_of(ref, struct svc_export, h.ref);
324 path_put(&exp->ex_path);
325 auth_domain_put(exp->ex_client);
326 kfree(exp->ex_pathname);
327 nfsd4_fslocs_free(&exp->ex_fslocs);
331 static void svc_export_request(struct cache_detail *cd,
332 struct cache_head *h,
333 char **bpp, int *blen)
336 struct svc_export *exp = container_of(h, struct svc_export, h);
339 qword_add(bpp, blen, exp->ex_client->name);
340 pth = d_path(&exp->ex_path, *bpp, *blen);
342 /* is this correct? */
346 qword_add(bpp, blen, pth);
350 static int svc_export_upcall(struct cache_detail *cd, struct cache_head *h)
352 return sunrpc_cache_pipe_upcall(cd, h, svc_export_request);
355 static struct svc_export *svc_export_update(struct svc_export *new,
356 struct svc_export *old);
357 static struct svc_export *svc_export_lookup(struct svc_export *);
359 static int check_export(struct inode *inode, int *flags, unsigned char *uuid)
363 * We currently export only dirs, regular files, and (for v4
364 * pseudoroot) symlinks.
366 if (!S_ISDIR(inode->i_mode) &&
367 !S_ISLNK(inode->i_mode) &&
368 !S_ISREG(inode->i_mode))
372 * Mountd should never pass down a writeable V4ROOT export, but,
375 if (*flags & NFSEXP_V4ROOT)
376 *flags |= NFSEXP_READONLY;
378 /* There are two requirements on a filesystem to be exportable.
379 * 1: We must be able to identify the filesystem from a number.
380 * either a device number (so FS_REQUIRES_DEV needed)
381 * or an FSID number (so NFSEXP_FSID or ->uuid is needed).
382 * 2: We must be able to find an inode from a filehandle.
383 * This means that s_export_op must be set.
385 if (!(inode->i_sb->s_type->fs_flags & FS_REQUIRES_DEV) &&
386 !(*flags & NFSEXP_FSID) &&
388 dprintk("exp_export: export of non-dev fs without fsid\n");
392 if (!inode->i_sb->s_export_op ||
393 !inode->i_sb->s_export_op->fh_to_dentry) {
394 dprintk("exp_export: export of invalid fs type.\n");
402 #ifdef CONFIG_NFSD_V4
405 fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc)
408 int migrated, i, err;
411 err = get_int(mesg, &fsloc->locations_count);
414 if (fsloc->locations_count > MAX_FS_LOCATIONS)
416 if (fsloc->locations_count == 0)
419 fsloc->locations = kzalloc(fsloc->locations_count
420 * sizeof(struct nfsd4_fs_location), GFP_KERNEL);
421 if (!fsloc->locations)
423 for (i=0; i < fsloc->locations_count; i++) {
424 /* colon separated host list */
426 len = qword_get(mesg, buf, PAGE_SIZE);
430 fsloc->locations[i].hosts = kstrdup(buf, GFP_KERNEL);
431 if (!fsloc->locations[i].hosts)
434 /* slash separated path component list */
435 len = qword_get(mesg, buf, PAGE_SIZE);
439 fsloc->locations[i].path = kstrdup(buf, GFP_KERNEL);
440 if (!fsloc->locations[i].path)
444 err = get_int(mesg, &migrated);
448 if (migrated < 0 || migrated > 1)
450 fsloc->migrated = migrated;
453 nfsd4_fslocs_free(fsloc);
457 static int secinfo_parse(char **mesg, char *buf, struct svc_export *exp)
460 struct exp_flavor_info *f;
462 err = get_int(mesg, &listsize);
465 if (listsize < 0 || listsize > MAX_SECINFO_LIST)
468 for (f = exp->ex_flavors; f < exp->ex_flavors + listsize; f++) {
469 err = get_int(mesg, &f->pseudoflavor);
473 * XXX: It would be nice to also check whether this
474 * pseudoflavor is supported, so we can discover the
475 * problem at export time instead of when a client fails
478 err = get_int(mesg, &f->flags);
481 /* Only some flags are allowed to differ between flavors: */
482 if (~NFSEXP_SECINFO_FLAGS & (f->flags ^ exp->ex_flags))
485 exp->ex_nflavors = listsize;
489 #else /* CONFIG_NFSD_V4 */
491 fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc){return 0;}
493 secinfo_parse(char **mesg, char *buf, struct svc_export *exp) { return 0; }
496 static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen)
498 /* client path expiry [flags anonuid anongid fsid] */
502 struct auth_domain *dom = NULL;
503 struct svc_export exp = {}, *expp;
506 if (mesg[mlen-1] != '\n')
510 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
516 len = qword_get(&mesg, buf, PAGE_SIZE);
521 dom = auth_domain_find(buf);
527 if ((len = qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
530 err = kern_path(buf, 0, &exp.ex_path);
537 exp.ex_pathname = kstrdup(buf, GFP_KERNEL);
538 if (!exp.ex_pathname)
543 exp.h.expiry_time = get_expiry(&mesg);
544 if (exp.h.expiry_time == 0)
548 err = get_int(&mesg, &an_int);
549 if (err == -ENOENT) {
551 set_bit(CACHE_NEGATIVE, &exp.h.flags);
553 if (err || an_int < 0)
555 exp.ex_flags= an_int;
558 err = get_int(&mesg, &an_int);
561 exp.ex_anon_uid= an_int;
564 err = get_int(&mesg, &an_int);
567 exp.ex_anon_gid= an_int;
570 err = get_int(&mesg, &an_int);
573 exp.ex_fsid = an_int;
575 while ((len = qword_get(&mesg, buf, PAGE_SIZE)) > 0) {
576 if (strcmp(buf, "fsloc") == 0)
577 err = fsloc_parse(&mesg, buf, &exp.ex_fslocs);
578 else if (strcmp(buf, "uuid") == 0) {
579 /* expect a 16 byte uuid encoded as \xXXXX... */
580 len = qword_get(&mesg, buf, PAGE_SIZE);
585 kmemdup(buf, 16, GFP_KERNEL);
586 if (exp.ex_uuid == NULL)
589 } else if (strcmp(buf, "secinfo") == 0)
590 err = secinfo_parse(&mesg, buf, &exp);
592 /* quietly ignore unknown words and anything
593 * following. Newer user-space can try to set
594 * new values, then see what the result was.
601 err = check_export(exp.ex_path.dentry->d_inode, &exp.ex_flags,
607 expp = svc_export_lookup(&exp);
609 expp = svc_export_update(&exp, expp);
618 nfsd4_fslocs_free(&exp.ex_fslocs);
621 kfree(exp.ex_pathname);
623 path_put(&exp.ex_path);
625 auth_domain_put(dom);
631 static void exp_flags(struct seq_file *m, int flag, int fsid,
632 uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fslocs);
633 static void show_secinfo(struct seq_file *m, struct svc_export *exp);
635 static int svc_export_show(struct seq_file *m,
636 struct cache_detail *cd,
637 struct cache_head *h)
639 struct svc_export *exp ;
642 seq_puts(m, "#path domain(flags)\n");
645 exp = container_of(h, struct svc_export, h);
646 seq_path(m, &exp->ex_path, " \t\n\\");
648 seq_escape(m, exp->ex_client->name, " \t\n\\");
650 if (test_bit(CACHE_VALID, &h->flags) &&
651 !test_bit(CACHE_NEGATIVE, &h->flags)) {
652 exp_flags(m, exp->ex_flags, exp->ex_fsid,
653 exp->ex_anon_uid, exp->ex_anon_gid, &exp->ex_fslocs);
656 seq_puts(m, ",uuid=");
657 for (i=0; i<16; i++) {
660 seq_printf(m, "%02x", exp->ex_uuid[i]);
663 show_secinfo(m, exp);
668 static int svc_export_match(struct cache_head *a, struct cache_head *b)
670 struct svc_export *orig = container_of(a, struct svc_export, h);
671 struct svc_export *new = container_of(b, struct svc_export, h);
672 return orig->ex_client == new->ex_client &&
673 orig->ex_path.dentry == new->ex_path.dentry &&
674 orig->ex_path.mnt == new->ex_path.mnt;
677 static void svc_export_init(struct cache_head *cnew, struct cache_head *citem)
679 struct svc_export *new = container_of(cnew, struct svc_export, h);
680 struct svc_export *item = container_of(citem, struct svc_export, h);
682 kref_get(&item->ex_client->ref);
683 new->ex_client = item->ex_client;
684 new->ex_path.dentry = dget(item->ex_path.dentry);
685 new->ex_path.mnt = mntget(item->ex_path.mnt);
686 new->ex_pathname = NULL;
687 new->ex_fslocs.locations = NULL;
688 new->ex_fslocs.locations_count = 0;
689 new->ex_fslocs.migrated = 0;
692 static void export_update(struct cache_head *cnew, struct cache_head *citem)
694 struct svc_export *new = container_of(cnew, struct svc_export, h);
695 struct svc_export *item = container_of(citem, struct svc_export, h);
698 new->ex_flags = item->ex_flags;
699 new->ex_anon_uid = item->ex_anon_uid;
700 new->ex_anon_gid = item->ex_anon_gid;
701 new->ex_fsid = item->ex_fsid;
702 new->ex_uuid = item->ex_uuid;
703 item->ex_uuid = NULL;
704 new->ex_pathname = item->ex_pathname;
705 item->ex_pathname = NULL;
706 new->ex_fslocs.locations = item->ex_fslocs.locations;
707 item->ex_fslocs.locations = NULL;
708 new->ex_fslocs.locations_count = item->ex_fslocs.locations_count;
709 item->ex_fslocs.locations_count = 0;
710 new->ex_fslocs.migrated = item->ex_fslocs.migrated;
711 item->ex_fslocs.migrated = 0;
712 new->ex_nflavors = item->ex_nflavors;
713 for (i = 0; i < MAX_SECINFO_LIST; i++) {
714 new->ex_flavors[i] = item->ex_flavors[i];
718 static struct cache_head *svc_export_alloc(void)
720 struct svc_export *i = kmalloc(sizeof(*i), GFP_KERNEL);
727 struct cache_detail svc_export_cache = {
728 .owner = THIS_MODULE,
729 .hash_size = EXPORT_HASHMAX,
730 .hash_table = export_table,
731 .name = "nfsd.export",
732 .cache_put = svc_export_put,
733 .cache_upcall = svc_export_upcall,
734 .cache_parse = svc_export_parse,
735 .cache_show = svc_export_show,
736 .match = svc_export_match,
737 .init = svc_export_init,
738 .update = export_update,
739 .alloc = svc_export_alloc,
742 static struct svc_export *
743 svc_export_lookup(struct svc_export *exp)
745 struct cache_head *ch;
747 hash = hash_ptr(exp->ex_client, EXPORT_HASHBITS);
748 hash ^= hash_ptr(exp->ex_path.dentry, EXPORT_HASHBITS);
749 hash ^= hash_ptr(exp->ex_path.mnt, EXPORT_HASHBITS);
751 ch = sunrpc_cache_lookup(&svc_export_cache, &exp->h,
754 return container_of(ch, struct svc_export, h);
759 static struct svc_export *
760 svc_export_update(struct svc_export *new, struct svc_export *old)
762 struct cache_head *ch;
764 hash = hash_ptr(old->ex_client, EXPORT_HASHBITS);
765 hash ^= hash_ptr(old->ex_path.dentry, EXPORT_HASHBITS);
766 hash ^= hash_ptr(old->ex_path.mnt, EXPORT_HASHBITS);
768 ch = sunrpc_cache_update(&svc_export_cache, &new->h,
772 return container_of(ch, struct svc_export, h);
778 static struct svc_expkey *
779 exp_find_key(svc_client *clp, int fsid_type, u32 *fsidv, struct cache_req *reqp)
781 struct svc_expkey key, *ek;
785 return ERR_PTR(-ENOENT);
788 key.ek_fsidtype = fsid_type;
789 memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
791 ek = svc_expkey_lookup(&key);
793 return ERR_PTR(-ENOMEM);
794 err = cache_check(&svc_expkey_cache, &ek->h, reqp);
800 static int exp_set_key(svc_client *clp, int fsid_type, u32 *fsidv,
801 struct svc_export *exp)
803 struct svc_expkey key, *ek;
806 key.ek_fsidtype = fsid_type;
807 memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
808 key.ek_path = exp->ex_path;
809 key.h.expiry_time = NEVER;
812 ek = svc_expkey_lookup(&key);
814 ek = svc_expkey_update(&key,ek);
816 cache_put(&ek->h, &svc_expkey_cache);
823 * Find the client's export entry matching xdev/xino.
825 static inline struct svc_expkey *
826 exp_get_key(svc_client *clp, dev_t dev, ino_t ino)
830 if (old_valid_dev(dev)) {
831 mk_fsid(FSID_DEV, fsidv, dev, ino, 0, NULL);
832 return exp_find_key(clp, FSID_DEV, fsidv, NULL);
834 mk_fsid(FSID_ENCODE_DEV, fsidv, dev, ino, 0, NULL);
835 return exp_find_key(clp, FSID_ENCODE_DEV, fsidv, NULL);
839 * Find the client's export entry matching fsid
841 static inline struct svc_expkey *
842 exp_get_fsid_key(svc_client *clp, int fsid)
846 mk_fsid(FSID_NUM, fsidv, 0, 0, fsid, NULL);
848 return exp_find_key(clp, FSID_NUM, fsidv, NULL);
851 static svc_export *exp_get_by_name(svc_client *clp, const struct path *path,
852 struct cache_req *reqp)
854 struct svc_export *exp, key;
858 return ERR_PTR(-ENOENT);
863 exp = svc_export_lookup(&key);
865 return ERR_PTR(-ENOMEM);
866 err = cache_check(&svc_export_cache, &exp->h, reqp);
873 * Find the export entry for a given dentry.
875 static struct svc_export *exp_parent(svc_client *clp, struct path *path)
877 struct dentry *saved = dget(path->dentry);
878 svc_export *exp = exp_get_by_name(clp, path, NULL);
880 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) {
881 struct dentry *parent = dget_parent(path->dentry);
883 path->dentry = parent;
884 exp = exp_get_by_name(clp, path, NULL);
887 path->dentry = saved;
892 * Hashtable locking. Write locks are placed only by user processes
893 * wanting to modify export information.
894 * Write locking only done in this file. Read locking
898 static DECLARE_RWSEM(hash_sem);
903 down_read(&hash_sem);
909 down_write(&hash_sem);
919 exp_writeunlock(void)
924 static void exp_fsid_unhash(struct svc_export *exp)
926 struct svc_expkey *ek;
928 if ((exp->ex_flags & NFSEXP_FSID) == 0)
931 ek = exp_get_fsid_key(exp->ex_client, exp->ex_fsid);
933 ek->h.expiry_time = get_seconds()-1;
934 cache_put(&ek->h, &svc_expkey_cache);
936 svc_expkey_cache.nextcheck = get_seconds();
939 static int exp_fsid_hash(svc_client *clp, struct svc_export *exp)
943 if ((exp->ex_flags & NFSEXP_FSID) == 0)
946 mk_fsid(FSID_NUM, fsid, 0, 0, exp->ex_fsid, NULL);
947 return exp_set_key(clp, FSID_NUM, fsid, exp);
950 static int exp_hash(struct auth_domain *clp, struct svc_export *exp)
953 struct inode *inode = exp->ex_path.dentry->d_inode;
954 dev_t dev = inode->i_sb->s_dev;
956 if (old_valid_dev(dev)) {
957 mk_fsid(FSID_DEV, fsid, dev, inode->i_ino, 0, NULL);
958 return exp_set_key(clp, FSID_DEV, fsid, exp);
960 mk_fsid(FSID_ENCODE_DEV, fsid, dev, inode->i_ino, 0, NULL);
961 return exp_set_key(clp, FSID_ENCODE_DEV, fsid, exp);
964 static void exp_unhash(struct svc_export *exp)
966 struct svc_expkey *ek;
967 struct inode *inode = exp->ex_path.dentry->d_inode;
969 ek = exp_get_key(exp->ex_client, inode->i_sb->s_dev, inode->i_ino);
971 ek->h.expiry_time = get_seconds()-1;
972 cache_put(&ek->h, &svc_expkey_cache);
974 svc_expkey_cache.nextcheck = get_seconds();
978 * Export a file system.
981 exp_export(struct nfsctl_export *nxp)
984 struct svc_export *exp = NULL;
985 struct svc_export new;
986 struct svc_expkey *fsid_key = NULL;
990 /* Consistency check */
992 if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) ||
993 !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX))
996 dprintk("exp_export called for %s:%s (%x/%ld fl %x).\n",
997 nxp->ex_client, nxp->ex_path,
998 (unsigned)nxp->ex_dev, (long)nxp->ex_ino,
1001 /* Try to lock the export table for update */
1004 /* Look up client info */
1005 if (!(clp = auth_domain_find(nxp->ex_client)))
1009 /* Look up the dentry */
1010 err = kern_path(nxp->ex_path, 0, &path);
1015 exp = exp_get_by_name(clp, &path, NULL);
1017 memset(&new, 0, sizeof(new));
1019 /* must make sure there won't be an ex_fsid clash */
1020 if ((nxp->ex_flags & NFSEXP_FSID) &&
1021 (!IS_ERR(fsid_key = exp_get_fsid_key(clp, nxp->ex_dev))) &&
1022 fsid_key->ek_path.mnt &&
1023 (fsid_key->ek_path.mnt != path.mnt ||
1024 fsid_key->ek_path.dentry != path.dentry))
1028 /* just a flags/id/fsid update */
1030 exp_fsid_unhash(exp);
1031 exp->ex_flags = nxp->ex_flags;
1032 exp->ex_anon_uid = nxp->ex_anon_uid;
1033 exp->ex_anon_gid = nxp->ex_anon_gid;
1034 exp->ex_fsid = nxp->ex_dev;
1036 err = exp_fsid_hash(clp, exp);
1040 err = check_export(path.dentry->d_inode, &nxp->ex_flags, NULL);
1041 if (err) goto finish;
1045 dprintk("nfsd: creating export entry %p for client %p\n", exp, clp);
1047 new.h.expiry_time = NEVER;
1049 new.ex_pathname = kstrdup(nxp->ex_path, GFP_KERNEL);
1050 if (!new.ex_pathname)
1052 new.ex_client = clp;
1054 new.ex_flags = nxp->ex_flags;
1055 new.ex_anon_uid = nxp->ex_anon_uid;
1056 new.ex_anon_gid = nxp->ex_anon_gid;
1057 new.ex_fsid = nxp->ex_dev;
1059 exp = svc_export_lookup(&new);
1061 exp = svc_export_update(&new, exp);
1066 if (exp_hash(clp, exp) ||
1067 exp_fsid_hash(clp, exp)) {
1068 /* failed to create at least one index */
1069 exp_do_unexport(exp);
1074 kfree(new.ex_pathname);
1077 if (fsid_key && !IS_ERR(fsid_key))
1078 cache_put(&fsid_key->h, &svc_expkey_cache);
1081 auth_domain_put(clp);
1089 * Unexport a file system. The export entry has already
1090 * been removed from the client's list of exported fs's.
1093 exp_do_unexport(svc_export *unexp)
1095 unexp->h.expiry_time = get_seconds()-1;
1096 svc_export_cache.nextcheck = get_seconds();
1098 exp_fsid_unhash(unexp);
1106 exp_unexport(struct nfsctl_export *nxp)
1108 struct auth_domain *dom;
1113 /* Consistency check */
1114 if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) ||
1115 !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX))
1121 dom = auth_domain_find(nxp->ex_client);
1123 dprintk("nfsd: unexport couldn't find %s\n", nxp->ex_client);
1127 err = kern_path(nxp->ex_path, 0, &path);
1132 exp = exp_get_by_name(dom, &path, NULL);
1137 exp_do_unexport(exp);
1142 auth_domain_put(dom);
1150 * Obtain the root fh on behalf of a client.
1151 * This could be done in user space, but I feel that it adds some safety
1152 * since its harder to fool a kernel module than a user space program.
1155 exp_rootfh(svc_client *clp, char *name, struct knfsd_fh *f, int maxsize)
1157 struct svc_export *exp;
1159 struct inode *inode;
1164 /* NB: we probably ought to check that it's NUL-terminated */
1165 if (kern_path(name, 0, &path)) {
1166 printk("nfsd: exp_rootfh path not found %s", name);
1169 inode = path.dentry->d_inode;
1171 dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n",
1172 name, path.dentry, clp->name,
1173 inode->i_sb->s_id, inode->i_ino);
1174 exp = exp_parent(clp, &path);
1181 * fh must be initialized before calling fh_compose
1183 fh_init(&fh, maxsize);
1184 if (fh_compose(&fh, exp, path.dentry, NULL))
1188 memcpy(f, &fh.fh_handle, sizeof(struct knfsd_fh));
1196 static struct svc_export *exp_find(struct auth_domain *clp, int fsid_type,
1197 u32 *fsidv, struct cache_req *reqp)
1199 struct svc_export *exp;
1200 struct svc_expkey *ek = exp_find_key(clp, fsid_type, fsidv, reqp);
1202 return ERR_CAST(ek);
1204 exp = exp_get_by_name(clp, &ek->ek_path, reqp);
1205 cache_put(&ek->h, &svc_expkey_cache);
1208 return ERR_CAST(exp);
1212 __be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp)
1214 struct exp_flavor_info *f;
1215 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
1217 /* legacy gss-only clients are always OK: */
1218 if (exp->ex_client == rqstp->rq_gssclient)
1220 /* ip-address based client; check sec= export option: */
1221 for (f = exp->ex_flavors; f < end; f++) {
1222 if (f->pseudoflavor == rqstp->rq_flavor)
1225 /* defaults in absence of sec= options: */
1226 if (exp->ex_nflavors == 0) {
1227 if (rqstp->rq_flavor == RPC_AUTH_NULL ||
1228 rqstp->rq_flavor == RPC_AUTH_UNIX)
1231 return nfserr_wrongsec;
1235 * Uses rq_client and rq_gssclient to find an export; uses rq_client (an
1236 * auth_unix client) if it's available and has secinfo information;
1237 * otherwise, will try to use rq_gssclient.
1239 * Called from functions that handle requests; functions that do work on
1240 * behalf of mountd are passed a single client name to use, and should
1241 * use exp_get_by_name() or exp_find().
1244 rqst_exp_get_by_name(struct svc_rqst *rqstp, struct path *path)
1246 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
1248 if (rqstp->rq_client == NULL)
1251 /* First try the auth_unix client: */
1252 exp = exp_get_by_name(rqstp->rq_client, path, &rqstp->rq_chandle);
1253 if (PTR_ERR(exp) == -ENOENT)
1257 /* If it has secinfo, assume there are no gss/... clients */
1258 if (exp->ex_nflavors > 0)
1261 /* Otherwise, try falling back on gss client */
1262 if (rqstp->rq_gssclient == NULL)
1264 gssexp = exp_get_by_name(rqstp->rq_gssclient, path, &rqstp->rq_chandle);
1265 if (PTR_ERR(gssexp) == -ENOENT)
1273 rqst_exp_find(struct svc_rqst *rqstp, int fsid_type, u32 *fsidv)
1275 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
1277 if (rqstp->rq_client == NULL)
1280 /* First try the auth_unix client: */
1281 exp = exp_find(rqstp->rq_client, fsid_type, fsidv, &rqstp->rq_chandle);
1282 if (PTR_ERR(exp) == -ENOENT)
1286 /* If it has secinfo, assume there are no gss/... clients */
1287 if (exp->ex_nflavors > 0)
1290 /* Otherwise, try falling back on gss client */
1291 if (rqstp->rq_gssclient == NULL)
1293 gssexp = exp_find(rqstp->rq_gssclient, fsid_type, fsidv,
1294 &rqstp->rq_chandle);
1295 if (PTR_ERR(gssexp) == -ENOENT)
1303 rqst_exp_parent(struct svc_rqst *rqstp, struct path *path)
1305 struct dentry *saved = dget(path->dentry);
1306 struct svc_export *exp = rqst_exp_get_by_name(rqstp, path);
1308 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) {
1309 struct dentry *parent = dget_parent(path->dentry);
1311 path->dentry = parent;
1312 exp = rqst_exp_get_by_name(rqstp, path);
1315 path->dentry = saved;
1319 static struct svc_export *find_fsidzero_export(struct svc_rqst *rqstp)
1321 struct svc_export *exp;
1324 mk_fsid(FSID_NUM, fsidv, 0, 0, 0, NULL);
1326 exp = rqst_exp_find(rqstp, FSID_NUM, fsidv);
1328 * We shouldn't have accepting an nfsv4 request at all if we
1329 * don't have a pseudoexport!:
1331 if (IS_ERR(exp) && PTR_ERR(exp) == -ENOENT)
1332 exp = ERR_PTR(-ESERVERFAULT);
1337 * Called when we need the filehandle for the root of the pseudofs,
1338 * for a given NFSv4 client. The root is defined to be the
1339 * export point with fsid==0
1342 exp_pseudoroot(struct svc_rqst *rqstp, struct svc_fh *fhp)
1344 struct svc_export *exp;
1347 exp = find_fsidzero_export(rqstp);
1349 return nfserrno(PTR_ERR(exp));
1350 rv = fh_compose(fhp, exp, exp->ex_path.dentry, NULL);
1353 rv = check_nfsd_access(exp, rqstp);
1363 static void *e_start(struct seq_file *m, loff_t *pos)
1364 __acquires(svc_export_cache.hash_lock)
1367 unsigned hash, export;
1368 struct cache_head *ch;
1371 read_lock(&svc_export_cache.hash_lock);
1373 return SEQ_START_TOKEN;
1375 export = n & ((1LL<<32) - 1);
1378 for (ch=export_table[hash]; ch; ch=ch->next)
1381 n &= ~((1LL<<32) - 1);
1385 } while(hash < EXPORT_HASHMAX && export_table[hash]==NULL);
1386 if (hash >= EXPORT_HASHMAX)
1389 return export_table[hash];
1392 static void *e_next(struct seq_file *m, void *p, loff_t *pos)
1394 struct cache_head *ch = p;
1395 int hash = (*pos >> 32);
1397 if (p == SEQ_START_TOKEN)
1399 else if (ch->next == NULL) {
1406 *pos &= ~((1LL<<32) - 1);
1407 while (hash < EXPORT_HASHMAX && export_table[hash] == NULL) {
1411 if (hash >= EXPORT_HASHMAX)
1414 return export_table[hash];
1417 static void e_stop(struct seq_file *m, void *p)
1418 __releases(svc_export_cache.hash_lock)
1420 read_unlock(&svc_export_cache.hash_lock);
1424 static struct flags {
1428 { NFSEXP_READONLY, {"ro", "rw"}},
1429 { NFSEXP_INSECURE_PORT, {"insecure", ""}},
1430 { NFSEXP_ROOTSQUASH, {"root_squash", "no_root_squash"}},
1431 { NFSEXP_ALLSQUASH, {"all_squash", ""}},
1432 { NFSEXP_ASYNC, {"async", "sync"}},
1433 { NFSEXP_GATHERED_WRITES, {"wdelay", "no_wdelay"}},
1434 { NFSEXP_NOHIDE, {"nohide", ""}},
1435 { NFSEXP_CROSSMOUNT, {"crossmnt", ""}},
1436 { NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}},
1437 { NFSEXP_NOAUTHNLM, {"insecure_locks", ""}},
1438 { NFSEXP_V4ROOT, {"v4root", ""}},
1440 { NFSEXP_MSNFS, {"msnfs", ""}},
1445 static void show_expflags(struct seq_file *m, int flags, int mask)
1448 int state, first = 0;
1450 for (flg = expflags; flg->flag; flg++) {
1451 if (flg->flag & ~mask)
1453 state = (flg->flag & flags) ? 0 : 1;
1454 if (*flg->name[state])
1455 seq_printf(m, "%s%s", first++?",":"", flg->name[state]);
1459 static void show_secinfo_flags(struct seq_file *m, int flags)
1462 show_expflags(m, flags, NFSEXP_SECINFO_FLAGS);
1465 static void show_secinfo(struct seq_file *m, struct svc_export *exp)
1467 struct exp_flavor_info *f;
1468 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
1469 int lastflags = 0, first = 0;
1471 if (exp->ex_nflavors == 0)
1473 for (f = exp->ex_flavors; f < end; f++) {
1474 if (first || f->flags != lastflags) {
1476 show_secinfo_flags(m, lastflags);
1477 seq_printf(m, ",sec=%d", f->pseudoflavor);
1478 lastflags = f->flags;
1480 seq_printf(m, ":%d", f->pseudoflavor);
1483 show_secinfo_flags(m, lastflags);
1486 static void exp_flags(struct seq_file *m, int flag, int fsid,
1487 uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fsloc)
1489 show_expflags(m, flag, NFSEXP_ALLFLAGS);
1490 if (flag & NFSEXP_FSID)
1491 seq_printf(m, ",fsid=%d", fsid);
1492 if (anonu != (uid_t)-2 && anonu != (0x10000-2))
1493 seq_printf(m, ",anonuid=%u", anonu);
1494 if (anong != (gid_t)-2 && anong != (0x10000-2))
1495 seq_printf(m, ",anongid=%u", anong);
1496 if (fsloc && fsloc->locations_count > 0) {
1497 char *loctype = (fsloc->migrated) ? "refer" : "replicas";
1500 seq_printf(m, ",%s=", loctype);
1501 seq_escape(m, fsloc->locations[0].path, ",;@ \t\n\\");
1503 seq_escape(m, fsloc->locations[0].hosts, ",;@ \t\n\\");
1504 for (i = 1; i < fsloc->locations_count; i++) {
1506 seq_escape(m, fsloc->locations[i].path, ",;@ \t\n\\");
1508 seq_escape(m, fsloc->locations[i].hosts, ",;@ \t\n\\");
1513 static int e_show(struct seq_file *m, void *p)
1515 struct cache_head *cp = p;
1516 struct svc_export *exp = container_of(cp, struct svc_export, h);
1518 if (p == SEQ_START_TOKEN) {
1519 seq_puts(m, "# Version 1.1\n");
1520 seq_puts(m, "# Path Client(Flags) # IPs\n");
1525 if (cache_check(&svc_export_cache, &exp->h, NULL))
1527 cache_put(&exp->h, &svc_export_cache);
1528 return svc_export_show(m, &svc_export_cache, cp);
1531 const struct seq_operations nfs_exports_op = {
1539 * Add or modify a client.
1540 * Change requests may involve the list of host addresses. The list of
1541 * exports and possibly existing uid maps are left untouched.
1544 exp_addclient(struct nfsctl_client *ncp)
1546 struct auth_domain *dom;
1548 struct in6_addr addr6;
1550 /* First, consistency check. */
1552 if (! exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX))
1554 if (ncp->cl_naddr > NFSCLNT_ADDRMAX)
1557 /* Lock the hashtable */
1560 dom = unix_domain_find(ncp->cl_ident);
1566 /* Insert client into hashtable. */
1567 for (i = 0; i < ncp->cl_naddr; i++) {
1568 ipv6_addr_set_v4mapped(ncp->cl_addrlist[i].s_addr, &addr6);
1569 auth_unix_add_addr(&addr6, dom);
1571 auth_unix_forget_old(dom);
1572 auth_domain_put(dom);
1583 * Delete a client given an identifier.
1586 exp_delclient(struct nfsctl_client *ncp)
1589 struct auth_domain *dom;
1592 if (!exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX))
1595 /* Lock the hashtable */
1598 dom = auth_domain_find(ncp->cl_ident);
1599 /* just make sure that no addresses work
1600 * and that it will expire soon
1603 err = auth_unix_forget_old(dom);
1604 auth_domain_put(dom);
1613 * Verify that string is non-empty and does not exceed max length.
1616 exp_verify_string(char *cp, int max)
1620 for (i = 0; i < max; i++)
1624 printk(KERN_NOTICE "nfsd: couldn't validate string %s\n", cp);
1629 * Initialize the exports module.
1632 nfsd_export_init(void)
1635 dprintk("nfsd: initializing export module.\n");
1637 rv = cache_register(&svc_export_cache);
1640 rv = cache_register(&svc_expkey_cache);
1642 cache_unregister(&svc_export_cache);
1648 * Flush exports table - called when last nfsd thread is killed
1651 nfsd_export_flush(void)
1654 cache_purge(&svc_expkey_cache);
1655 cache_purge(&svc_export_cache);
1660 * Shutdown the exports module.
1663 nfsd_export_shutdown(void)
1666 dprintk("nfsd: shutting down export module.\n");
1670 cache_unregister(&svc_expkey_cache);
1671 cache_unregister(&svc_export_cache);
1672 svcauth_unix_purge();
1675 dprintk("nfsd: export shutdown complete.\n");