1 #define MSNFS /* HACK HACK */
3 * NFS exporting and validation.
5 * We maintain a list of clients, each of which has a list of
6 * exports. To export an fs to a given client, you first have
7 * to create the client entry with NFSCTL_ADDCLIENT, which
8 * creates a client control block and adds it to the hash
9 * table. Then, you call NFSCTL_EXPORT for each fs.
12 * Copyright (C) 1995, 1996 Olaf Kirch, <okir@monad.swb.de>
15 #include <linux/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;
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)
361 * We currently export only dirs, regular files, and (for v4
362 * pseudoroot) symlinks.
364 if (!S_ISDIR(inode->i_mode) &&
365 !S_ISLNK(inode->i_mode) &&
366 !S_ISREG(inode->i_mode))
370 * Mountd should never pass down a writeable V4ROOT export, but,
373 if (*flags & NFSEXP_V4ROOT)
374 *flags |= NFSEXP_READONLY;
376 /* There are two requirements on a filesystem to be exportable.
377 * 1: We must be able to identify the filesystem from a number.
378 * either a device number (so FS_REQUIRES_DEV needed)
379 * or an FSID number (so NFSEXP_FSID or ->uuid is needed).
380 * 2: We must be able to find an inode from a filehandle.
381 * This means that s_export_op must be set.
383 if (!(inode->i_sb->s_type->fs_flags & FS_REQUIRES_DEV) &&
384 !(*flags & NFSEXP_FSID) &&
386 dprintk("exp_export: export of non-dev fs without fsid\n");
390 if (!inode->i_sb->s_export_op ||
391 !inode->i_sb->s_export_op->fh_to_dentry) {
392 dprintk("exp_export: export of invalid fs type.\n");
400 #ifdef CONFIG_NFSD_V4
403 fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc)
406 int migrated, i, err;
409 err = get_int(mesg, &fsloc->locations_count);
412 if (fsloc->locations_count > MAX_FS_LOCATIONS)
414 if (fsloc->locations_count == 0)
417 fsloc->locations = kzalloc(fsloc->locations_count
418 * sizeof(struct nfsd4_fs_location), GFP_KERNEL);
419 if (!fsloc->locations)
421 for (i=0; i < fsloc->locations_count; i++) {
422 /* colon separated host list */
424 len = qword_get(mesg, buf, PAGE_SIZE);
428 fsloc->locations[i].hosts = kstrdup(buf, GFP_KERNEL);
429 if (!fsloc->locations[i].hosts)
432 /* slash separated path component list */
433 len = qword_get(mesg, buf, PAGE_SIZE);
437 fsloc->locations[i].path = kstrdup(buf, GFP_KERNEL);
438 if (!fsloc->locations[i].path)
442 err = get_int(mesg, &migrated);
446 if (migrated < 0 || migrated > 1)
448 fsloc->migrated = migrated;
451 nfsd4_fslocs_free(fsloc);
455 static int secinfo_parse(char **mesg, char *buf, struct svc_export *exp)
458 struct exp_flavor_info *f;
460 err = get_int(mesg, &listsize);
463 if (listsize < 0 || listsize > MAX_SECINFO_LIST)
466 for (f = exp->ex_flavors; f < exp->ex_flavors + listsize; f++) {
467 err = get_int(mesg, &f->pseudoflavor);
471 * XXX: It would be nice to also check whether this
472 * pseudoflavor is supported, so we can discover the
473 * problem at export time instead of when a client fails
476 err = get_int(mesg, &f->flags);
479 /* Only some flags are allowed to differ between flavors: */
480 if (~NFSEXP_SECINFO_FLAGS & (f->flags ^ exp->ex_flags))
483 exp->ex_nflavors = listsize;
487 #else /* CONFIG_NFSD_V4 */
489 fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc){return 0;}
491 secinfo_parse(char **mesg, char *buf, struct svc_export *exp) { return 0; }
494 static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen)
496 /* client path expiry [flags anonuid anongid fsid] */
500 struct auth_domain *dom = NULL;
501 struct svc_export exp = {}, *expp;
504 if (mesg[mlen-1] != '\n')
508 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
514 len = qword_get(&mesg, buf, PAGE_SIZE);
519 dom = auth_domain_find(buf);
525 if ((len = qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
528 err = kern_path(buf, 0, &exp.ex_path);
535 exp.ex_pathname = kstrdup(buf, GFP_KERNEL);
536 if (!exp.ex_pathname)
541 exp.h.expiry_time = get_expiry(&mesg);
542 if (exp.h.expiry_time == 0)
546 err = get_int(&mesg, &an_int);
547 if (err == -ENOENT) {
549 set_bit(CACHE_NEGATIVE, &exp.h.flags);
551 if (err || an_int < 0)
553 exp.ex_flags= an_int;
556 err = get_int(&mesg, &an_int);
559 exp.ex_anon_uid= an_int;
562 err = get_int(&mesg, &an_int);
565 exp.ex_anon_gid= an_int;
568 err = get_int(&mesg, &an_int);
571 exp.ex_fsid = an_int;
573 while ((len = qword_get(&mesg, buf, PAGE_SIZE)) > 0) {
574 if (strcmp(buf, "fsloc") == 0)
575 err = fsloc_parse(&mesg, buf, &exp.ex_fslocs);
576 else if (strcmp(buf, "uuid") == 0) {
577 /* expect a 16 byte uuid encoded as \xXXXX... */
578 len = qword_get(&mesg, buf, PAGE_SIZE);
583 kmemdup(buf, 16, GFP_KERNEL);
584 if (exp.ex_uuid == NULL)
587 } else if (strcmp(buf, "secinfo") == 0)
588 err = secinfo_parse(&mesg, buf, &exp);
590 /* quietly ignore unknown words and anything
591 * following. Newer user-space can try to set
592 * new values, then see what the result was.
599 err = check_export(exp.ex_path.dentry->d_inode, &exp.ex_flags,
605 expp = svc_export_lookup(&exp);
607 expp = svc_export_update(&exp, expp);
616 nfsd4_fslocs_free(&exp.ex_fslocs);
619 kfree(exp.ex_pathname);
621 path_put(&exp.ex_path);
623 auth_domain_put(dom);
629 static void exp_flags(struct seq_file *m, int flag, int fsid,
630 uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fslocs);
631 static void show_secinfo(struct seq_file *m, struct svc_export *exp);
633 static int svc_export_show(struct seq_file *m,
634 struct cache_detail *cd,
635 struct cache_head *h)
637 struct svc_export *exp ;
640 seq_puts(m, "#path domain(flags)\n");
643 exp = container_of(h, struct svc_export, h);
644 seq_path(m, &exp->ex_path, " \t\n\\");
646 seq_escape(m, exp->ex_client->name, " \t\n\\");
648 if (test_bit(CACHE_VALID, &h->flags) &&
649 !test_bit(CACHE_NEGATIVE, &h->flags)) {
650 exp_flags(m, exp->ex_flags, exp->ex_fsid,
651 exp->ex_anon_uid, exp->ex_anon_gid, &exp->ex_fslocs);
654 seq_puts(m, ",uuid=");
655 for (i=0; i<16; i++) {
658 seq_printf(m, "%02x", exp->ex_uuid[i]);
661 show_secinfo(m, exp);
666 static int svc_export_match(struct cache_head *a, struct cache_head *b)
668 struct svc_export *orig = container_of(a, struct svc_export, h);
669 struct svc_export *new = container_of(b, struct svc_export, h);
670 return orig->ex_client == new->ex_client &&
671 orig->ex_path.dentry == new->ex_path.dentry &&
672 orig->ex_path.mnt == new->ex_path.mnt;
675 static void svc_export_init(struct cache_head *cnew, struct cache_head *citem)
677 struct svc_export *new = container_of(cnew, struct svc_export, h);
678 struct svc_export *item = container_of(citem, struct svc_export, h);
680 kref_get(&item->ex_client->ref);
681 new->ex_client = item->ex_client;
682 new->ex_path.dentry = dget(item->ex_path.dentry);
683 new->ex_path.mnt = mntget(item->ex_path.mnt);
684 new->ex_pathname = NULL;
685 new->ex_fslocs.locations = NULL;
686 new->ex_fslocs.locations_count = 0;
687 new->ex_fslocs.migrated = 0;
690 static void export_update(struct cache_head *cnew, struct cache_head *citem)
692 struct svc_export *new = container_of(cnew, struct svc_export, h);
693 struct svc_export *item = container_of(citem, struct svc_export, h);
696 new->ex_flags = item->ex_flags;
697 new->ex_anon_uid = item->ex_anon_uid;
698 new->ex_anon_gid = item->ex_anon_gid;
699 new->ex_fsid = item->ex_fsid;
700 new->ex_uuid = item->ex_uuid;
701 item->ex_uuid = NULL;
702 new->ex_pathname = item->ex_pathname;
703 item->ex_pathname = NULL;
704 new->ex_fslocs.locations = item->ex_fslocs.locations;
705 item->ex_fslocs.locations = NULL;
706 new->ex_fslocs.locations_count = item->ex_fslocs.locations_count;
707 item->ex_fslocs.locations_count = 0;
708 new->ex_fslocs.migrated = item->ex_fslocs.migrated;
709 item->ex_fslocs.migrated = 0;
710 new->ex_nflavors = item->ex_nflavors;
711 for (i = 0; i < MAX_SECINFO_LIST; i++) {
712 new->ex_flavors[i] = item->ex_flavors[i];
716 static struct cache_head *svc_export_alloc(void)
718 struct svc_export *i = kmalloc(sizeof(*i), GFP_KERNEL);
725 struct cache_detail svc_export_cache = {
726 .owner = THIS_MODULE,
727 .hash_size = EXPORT_HASHMAX,
728 .hash_table = export_table,
729 .name = "nfsd.export",
730 .cache_put = svc_export_put,
731 .cache_upcall = svc_export_upcall,
732 .cache_parse = svc_export_parse,
733 .cache_show = svc_export_show,
734 .match = svc_export_match,
735 .init = svc_export_init,
736 .update = export_update,
737 .alloc = svc_export_alloc,
740 static struct svc_export *
741 svc_export_lookup(struct svc_export *exp)
743 struct cache_head *ch;
745 hash = hash_ptr(exp->ex_client, EXPORT_HASHBITS);
746 hash ^= hash_ptr(exp->ex_path.dentry, EXPORT_HASHBITS);
747 hash ^= hash_ptr(exp->ex_path.mnt, EXPORT_HASHBITS);
749 ch = sunrpc_cache_lookup(&svc_export_cache, &exp->h,
752 return container_of(ch, struct svc_export, h);
757 static struct svc_export *
758 svc_export_update(struct svc_export *new, struct svc_export *old)
760 struct cache_head *ch;
762 hash = hash_ptr(old->ex_client, EXPORT_HASHBITS);
763 hash ^= hash_ptr(old->ex_path.dentry, EXPORT_HASHBITS);
764 hash ^= hash_ptr(old->ex_path.mnt, EXPORT_HASHBITS);
766 ch = sunrpc_cache_update(&svc_export_cache, &new->h,
770 return container_of(ch, struct svc_export, h);
776 static struct svc_expkey *
777 exp_find_key(svc_client *clp, int fsid_type, u32 *fsidv, struct cache_req *reqp)
779 struct svc_expkey key, *ek;
783 return ERR_PTR(-ENOENT);
786 key.ek_fsidtype = fsid_type;
787 memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
789 ek = svc_expkey_lookup(&key);
791 return ERR_PTR(-ENOMEM);
792 err = cache_check(&svc_expkey_cache, &ek->h, reqp);
798 static int exp_set_key(svc_client *clp, int fsid_type, u32 *fsidv,
799 struct svc_export *exp)
801 struct svc_expkey key, *ek;
804 key.ek_fsidtype = fsid_type;
805 memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
806 key.ek_path = exp->ex_path;
807 key.h.expiry_time = NEVER;
810 ek = svc_expkey_lookup(&key);
812 ek = svc_expkey_update(&key,ek);
814 cache_put(&ek->h, &svc_expkey_cache);
821 * Find the client's export entry matching xdev/xino.
823 static inline struct svc_expkey *
824 exp_get_key(svc_client *clp, dev_t dev, ino_t ino)
828 if (old_valid_dev(dev)) {
829 mk_fsid(FSID_DEV, fsidv, dev, ino, 0, NULL);
830 return exp_find_key(clp, FSID_DEV, fsidv, NULL);
832 mk_fsid(FSID_ENCODE_DEV, fsidv, dev, ino, 0, NULL);
833 return exp_find_key(clp, FSID_ENCODE_DEV, fsidv, NULL);
837 * Find the client's export entry matching fsid
839 static inline struct svc_expkey *
840 exp_get_fsid_key(svc_client *clp, int fsid)
844 mk_fsid(FSID_NUM, fsidv, 0, 0, fsid, NULL);
846 return exp_find_key(clp, FSID_NUM, fsidv, NULL);
849 static svc_export *exp_get_by_name(svc_client *clp, const struct path *path,
850 struct cache_req *reqp)
852 struct svc_export *exp, key;
856 return ERR_PTR(-ENOENT);
861 exp = svc_export_lookup(&key);
863 return ERR_PTR(-ENOMEM);
864 err = cache_check(&svc_export_cache, &exp->h, reqp);
871 * Find the export entry for a given dentry.
873 static struct svc_export *exp_parent(svc_client *clp, struct path *path)
875 struct dentry *saved = dget(path->dentry);
876 svc_export *exp = exp_get_by_name(clp, path, NULL);
878 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) {
879 struct dentry *parent = dget_parent(path->dentry);
881 path->dentry = parent;
882 exp = exp_get_by_name(clp, path, NULL);
885 path->dentry = saved;
890 * Hashtable locking. Write locks are placed only by user processes
891 * wanting to modify export information.
892 * Write locking only done in this file. Read locking
896 static DECLARE_RWSEM(hash_sem);
901 down_read(&hash_sem);
907 down_write(&hash_sem);
917 exp_writeunlock(void)
922 static void exp_fsid_unhash(struct svc_export *exp)
924 struct svc_expkey *ek;
926 if ((exp->ex_flags & NFSEXP_FSID) == 0)
929 ek = exp_get_fsid_key(exp->ex_client, exp->ex_fsid);
931 ek->h.expiry_time = get_seconds()-1;
932 cache_put(&ek->h, &svc_expkey_cache);
934 svc_expkey_cache.nextcheck = get_seconds();
937 static int exp_fsid_hash(svc_client *clp, struct svc_export *exp)
941 if ((exp->ex_flags & NFSEXP_FSID) == 0)
944 mk_fsid(FSID_NUM, fsid, 0, 0, exp->ex_fsid, NULL);
945 return exp_set_key(clp, FSID_NUM, fsid, exp);
948 static int exp_hash(struct auth_domain *clp, struct svc_export *exp)
951 struct inode *inode = exp->ex_path.dentry->d_inode;
952 dev_t dev = inode->i_sb->s_dev;
954 if (old_valid_dev(dev)) {
955 mk_fsid(FSID_DEV, fsid, dev, inode->i_ino, 0, NULL);
956 return exp_set_key(clp, FSID_DEV, fsid, exp);
958 mk_fsid(FSID_ENCODE_DEV, fsid, dev, inode->i_ino, 0, NULL);
959 return exp_set_key(clp, FSID_ENCODE_DEV, fsid, exp);
962 static void exp_unhash(struct svc_export *exp)
964 struct svc_expkey *ek;
965 struct inode *inode = exp->ex_path.dentry->d_inode;
967 ek = exp_get_key(exp->ex_client, inode->i_sb->s_dev, inode->i_ino);
969 ek->h.expiry_time = get_seconds()-1;
970 cache_put(&ek->h, &svc_expkey_cache);
972 svc_expkey_cache.nextcheck = get_seconds();
976 * Export a file system.
979 exp_export(struct nfsctl_export *nxp)
982 struct svc_export *exp = NULL;
983 struct svc_export new;
984 struct svc_expkey *fsid_key = NULL;
988 /* Consistency check */
990 if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) ||
991 !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX))
994 dprintk("exp_export called for %s:%s (%x/%ld fl %x).\n",
995 nxp->ex_client, nxp->ex_path,
996 (unsigned)nxp->ex_dev, (long)nxp->ex_ino,
999 /* Try to lock the export table for update */
1002 /* Look up client info */
1003 if (!(clp = auth_domain_find(nxp->ex_client)))
1007 /* Look up the dentry */
1008 err = kern_path(nxp->ex_path, 0, &path);
1013 exp = exp_get_by_name(clp, &path, NULL);
1015 memset(&new, 0, sizeof(new));
1017 /* must make sure there won't be an ex_fsid clash */
1018 if ((nxp->ex_flags & NFSEXP_FSID) &&
1019 (!IS_ERR(fsid_key = exp_get_fsid_key(clp, nxp->ex_dev))) &&
1020 fsid_key->ek_path.mnt &&
1021 (fsid_key->ek_path.mnt != path.mnt ||
1022 fsid_key->ek_path.dentry != path.dentry))
1026 /* just a flags/id/fsid update */
1028 exp_fsid_unhash(exp);
1029 exp->ex_flags = nxp->ex_flags;
1030 exp->ex_anon_uid = nxp->ex_anon_uid;
1031 exp->ex_anon_gid = nxp->ex_anon_gid;
1032 exp->ex_fsid = nxp->ex_dev;
1034 err = exp_fsid_hash(clp, exp);
1038 err = check_export(path.dentry->d_inode, &nxp->ex_flags, NULL);
1039 if (err) goto finish;
1043 dprintk("nfsd: creating export entry %p for client %p\n", exp, clp);
1045 new.h.expiry_time = NEVER;
1047 new.ex_pathname = kstrdup(nxp->ex_path, GFP_KERNEL);
1048 if (!new.ex_pathname)
1050 new.ex_client = clp;
1052 new.ex_flags = nxp->ex_flags;
1053 new.ex_anon_uid = nxp->ex_anon_uid;
1054 new.ex_anon_gid = nxp->ex_anon_gid;
1055 new.ex_fsid = nxp->ex_dev;
1057 exp = svc_export_lookup(&new);
1059 exp = svc_export_update(&new, exp);
1064 if (exp_hash(clp, exp) ||
1065 exp_fsid_hash(clp, exp)) {
1066 /* failed to create at least one index */
1067 exp_do_unexport(exp);
1072 kfree(new.ex_pathname);
1075 if (fsid_key && !IS_ERR(fsid_key))
1076 cache_put(&fsid_key->h, &svc_expkey_cache);
1079 auth_domain_put(clp);
1087 * Unexport a file system. The export entry has already
1088 * been removed from the client's list of exported fs's.
1091 exp_do_unexport(svc_export *unexp)
1093 unexp->h.expiry_time = get_seconds()-1;
1094 svc_export_cache.nextcheck = get_seconds();
1096 exp_fsid_unhash(unexp);
1104 exp_unexport(struct nfsctl_export *nxp)
1106 struct auth_domain *dom;
1111 /* Consistency check */
1112 if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) ||
1113 !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX))
1119 dom = auth_domain_find(nxp->ex_client);
1121 dprintk("nfsd: unexport couldn't find %s\n", nxp->ex_client);
1125 err = kern_path(nxp->ex_path, 0, &path);
1130 exp = exp_get_by_name(dom, &path, NULL);
1135 exp_do_unexport(exp);
1140 auth_domain_put(dom);
1148 * Obtain the root fh on behalf of a client.
1149 * This could be done in user space, but I feel that it adds some safety
1150 * since its harder to fool a kernel module than a user space program.
1153 exp_rootfh(svc_client *clp, char *name, struct knfsd_fh *f, int maxsize)
1155 struct svc_export *exp;
1157 struct inode *inode;
1162 /* NB: we probably ought to check that it's NUL-terminated */
1163 if (kern_path(name, 0, &path)) {
1164 printk("nfsd: exp_rootfh path not found %s", name);
1167 inode = path.dentry->d_inode;
1169 dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n",
1170 name, path.dentry, clp->name,
1171 inode->i_sb->s_id, inode->i_ino);
1172 exp = exp_parent(clp, &path);
1179 * fh must be initialized before calling fh_compose
1181 fh_init(&fh, maxsize);
1182 if (fh_compose(&fh, exp, path.dentry, NULL))
1186 memcpy(f, &fh.fh_handle, sizeof(struct knfsd_fh));
1194 static struct svc_export *exp_find(struct auth_domain *clp, int fsid_type,
1195 u32 *fsidv, struct cache_req *reqp)
1197 struct svc_export *exp;
1198 struct svc_expkey *ek = exp_find_key(clp, fsid_type, fsidv, reqp);
1200 return ERR_CAST(ek);
1202 exp = exp_get_by_name(clp, &ek->ek_path, reqp);
1203 cache_put(&ek->h, &svc_expkey_cache);
1206 return ERR_CAST(exp);
1210 __be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp)
1212 struct exp_flavor_info *f;
1213 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
1215 /* legacy gss-only clients are always OK: */
1216 if (exp->ex_client == rqstp->rq_gssclient)
1218 /* ip-address based client; check sec= export option: */
1219 for (f = exp->ex_flavors; f < end; f++) {
1220 if (f->pseudoflavor == rqstp->rq_flavor)
1223 /* defaults in absence of sec= options: */
1224 if (exp->ex_nflavors == 0) {
1225 if (rqstp->rq_flavor == RPC_AUTH_NULL ||
1226 rqstp->rq_flavor == RPC_AUTH_UNIX)
1229 return nfserr_wrongsec;
1233 * Uses rq_client and rq_gssclient to find an export; uses rq_client (an
1234 * auth_unix client) if it's available and has secinfo information;
1235 * otherwise, will try to use rq_gssclient.
1237 * Called from functions that handle requests; functions that do work on
1238 * behalf of mountd are passed a single client name to use, and should
1239 * use exp_get_by_name() or exp_find().
1242 rqst_exp_get_by_name(struct svc_rqst *rqstp, struct path *path)
1244 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
1246 if (rqstp->rq_client == NULL)
1249 /* First try the auth_unix client: */
1250 exp = exp_get_by_name(rqstp->rq_client, path, &rqstp->rq_chandle);
1251 if (PTR_ERR(exp) == -ENOENT)
1255 /* If it has secinfo, assume there are no gss/... clients */
1256 if (exp->ex_nflavors > 0)
1259 /* Otherwise, try falling back on gss client */
1260 if (rqstp->rq_gssclient == NULL)
1262 gssexp = exp_get_by_name(rqstp->rq_gssclient, path, &rqstp->rq_chandle);
1263 if (PTR_ERR(gssexp) == -ENOENT)
1271 rqst_exp_find(struct svc_rqst *rqstp, int fsid_type, u32 *fsidv)
1273 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
1275 if (rqstp->rq_client == NULL)
1278 /* First try the auth_unix client: */
1279 exp = exp_find(rqstp->rq_client, fsid_type, fsidv, &rqstp->rq_chandle);
1280 if (PTR_ERR(exp) == -ENOENT)
1284 /* If it has secinfo, assume there are no gss/... clients */
1285 if (exp->ex_nflavors > 0)
1288 /* Otherwise, try falling back on gss client */
1289 if (rqstp->rq_gssclient == NULL)
1291 gssexp = exp_find(rqstp->rq_gssclient, fsid_type, fsidv,
1292 &rqstp->rq_chandle);
1293 if (PTR_ERR(gssexp) == -ENOENT)
1301 rqst_exp_parent(struct svc_rqst *rqstp, struct path *path)
1303 struct dentry *saved = dget(path->dentry);
1304 struct svc_export *exp = rqst_exp_get_by_name(rqstp, path);
1306 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) {
1307 struct dentry *parent = dget_parent(path->dentry);
1309 path->dentry = parent;
1310 exp = rqst_exp_get_by_name(rqstp, path);
1313 path->dentry = saved;
1317 static struct svc_export *find_fsidzero_export(struct svc_rqst *rqstp)
1321 mk_fsid(FSID_NUM, fsidv, 0, 0, 0, NULL);
1323 return rqst_exp_find(rqstp, FSID_NUM, fsidv);
1327 * Called when we need the filehandle for the root of the pseudofs,
1328 * for a given NFSv4 client. The root is defined to be the
1329 * export point with fsid==0
1332 exp_pseudoroot(struct svc_rqst *rqstp, struct svc_fh *fhp)
1334 struct svc_export *exp;
1337 exp = find_fsidzero_export(rqstp);
1339 return nfserrno(PTR_ERR(exp));
1340 rv = fh_compose(fhp, exp, exp->ex_path.dentry, NULL);
1343 rv = check_nfsd_access(exp, rqstp);
1353 static void *e_start(struct seq_file *m, loff_t *pos)
1354 __acquires(svc_export_cache.hash_lock)
1357 unsigned hash, export;
1358 struct cache_head *ch;
1361 read_lock(&svc_export_cache.hash_lock);
1363 return SEQ_START_TOKEN;
1365 export = n & ((1LL<<32) - 1);
1368 for (ch=export_table[hash]; ch; ch=ch->next)
1371 n &= ~((1LL<<32) - 1);
1375 } while(hash < EXPORT_HASHMAX && export_table[hash]==NULL);
1376 if (hash >= EXPORT_HASHMAX)
1379 return export_table[hash];
1382 static void *e_next(struct seq_file *m, void *p, loff_t *pos)
1384 struct cache_head *ch = p;
1385 int hash = (*pos >> 32);
1387 if (p == SEQ_START_TOKEN)
1389 else if (ch->next == NULL) {
1396 *pos &= ~((1LL<<32) - 1);
1397 while (hash < EXPORT_HASHMAX && export_table[hash] == NULL) {
1401 if (hash >= EXPORT_HASHMAX)
1404 return export_table[hash];
1407 static void e_stop(struct seq_file *m, void *p)
1408 __releases(svc_export_cache.hash_lock)
1410 read_unlock(&svc_export_cache.hash_lock);
1414 static struct flags {
1418 { NFSEXP_READONLY, {"ro", "rw"}},
1419 { NFSEXP_INSECURE_PORT, {"insecure", ""}},
1420 { NFSEXP_ROOTSQUASH, {"root_squash", "no_root_squash"}},
1421 { NFSEXP_ALLSQUASH, {"all_squash", ""}},
1422 { NFSEXP_ASYNC, {"async", "sync"}},
1423 { NFSEXP_GATHERED_WRITES, {"wdelay", "no_wdelay"}},
1424 { NFSEXP_NOHIDE, {"nohide", ""}},
1425 { NFSEXP_CROSSMOUNT, {"crossmnt", ""}},
1426 { NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}},
1427 { NFSEXP_NOAUTHNLM, {"insecure_locks", ""}},
1428 { NFSEXP_V4ROOT, {"v4root", ""}},
1430 { NFSEXP_MSNFS, {"msnfs", ""}},
1435 static void show_expflags(struct seq_file *m, int flags, int mask)
1438 int state, first = 0;
1440 for (flg = expflags; flg->flag; flg++) {
1441 if (flg->flag & ~mask)
1443 state = (flg->flag & flags) ? 0 : 1;
1444 if (*flg->name[state])
1445 seq_printf(m, "%s%s", first++?",":"", flg->name[state]);
1449 static void show_secinfo_flags(struct seq_file *m, int flags)
1452 show_expflags(m, flags, NFSEXP_SECINFO_FLAGS);
1455 static void show_secinfo(struct seq_file *m, struct svc_export *exp)
1457 struct exp_flavor_info *f;
1458 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
1459 int lastflags = 0, first = 0;
1461 if (exp->ex_nflavors == 0)
1463 for (f = exp->ex_flavors; f < end; f++) {
1464 if (first || f->flags != lastflags) {
1466 show_secinfo_flags(m, lastflags);
1467 seq_printf(m, ",sec=%d", f->pseudoflavor);
1468 lastflags = f->flags;
1470 seq_printf(m, ":%d", f->pseudoflavor);
1473 show_secinfo_flags(m, lastflags);
1476 static void exp_flags(struct seq_file *m, int flag, int fsid,
1477 uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fsloc)
1479 show_expflags(m, flag, NFSEXP_ALLFLAGS);
1480 if (flag & NFSEXP_FSID)
1481 seq_printf(m, ",fsid=%d", fsid);
1482 if (anonu != (uid_t)-2 && anonu != (0x10000-2))
1483 seq_printf(m, ",anonuid=%u", anonu);
1484 if (anong != (gid_t)-2 && anong != (0x10000-2))
1485 seq_printf(m, ",anongid=%u", anong);
1486 if (fsloc && fsloc->locations_count > 0) {
1487 char *loctype = (fsloc->migrated) ? "refer" : "replicas";
1490 seq_printf(m, ",%s=", loctype);
1491 seq_escape(m, fsloc->locations[0].path, ",;@ \t\n\\");
1493 seq_escape(m, fsloc->locations[0].hosts, ",;@ \t\n\\");
1494 for (i = 1; i < fsloc->locations_count; i++) {
1496 seq_escape(m, fsloc->locations[i].path, ",;@ \t\n\\");
1498 seq_escape(m, fsloc->locations[i].hosts, ",;@ \t\n\\");
1503 static int e_show(struct seq_file *m, void *p)
1505 struct cache_head *cp = p;
1506 struct svc_export *exp = container_of(cp, struct svc_export, h);
1508 if (p == SEQ_START_TOKEN) {
1509 seq_puts(m, "# Version 1.1\n");
1510 seq_puts(m, "# Path Client(Flags) # IPs\n");
1515 if (cache_check(&svc_export_cache, &exp->h, NULL))
1517 cache_put(&exp->h, &svc_export_cache);
1518 return svc_export_show(m, &svc_export_cache, cp);
1521 const struct seq_operations nfs_exports_op = {
1529 * Add or modify a client.
1530 * Change requests may involve the list of host addresses. The list of
1531 * exports and possibly existing uid maps are left untouched.
1534 exp_addclient(struct nfsctl_client *ncp)
1536 struct auth_domain *dom;
1538 struct in6_addr addr6;
1540 /* First, consistency check. */
1542 if (! exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX))
1544 if (ncp->cl_naddr > NFSCLNT_ADDRMAX)
1547 /* Lock the hashtable */
1550 dom = unix_domain_find(ncp->cl_ident);
1556 /* Insert client into hashtable. */
1557 for (i = 0; i < ncp->cl_naddr; i++) {
1558 ipv6_addr_set_v4mapped(ncp->cl_addrlist[i].s_addr, &addr6);
1559 auth_unix_add_addr(&addr6, dom);
1561 auth_unix_forget_old(dom);
1562 auth_domain_put(dom);
1573 * Delete a client given an identifier.
1576 exp_delclient(struct nfsctl_client *ncp)
1579 struct auth_domain *dom;
1582 if (!exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX))
1585 /* Lock the hashtable */
1588 dom = auth_domain_find(ncp->cl_ident);
1589 /* just make sure that no addresses work
1590 * and that it will expire soon
1593 err = auth_unix_forget_old(dom);
1594 auth_domain_put(dom);
1603 * Verify that string is non-empty and does not exceed max length.
1606 exp_verify_string(char *cp, int max)
1610 for (i = 0; i < max; i++)
1614 printk(KERN_NOTICE "nfsd: couldn't validate string %s\n", cp);
1619 * Initialize the exports module.
1622 nfsd_export_init(void)
1625 dprintk("nfsd: initializing export module.\n");
1627 rv = cache_register(&svc_export_cache);
1630 rv = cache_register(&svc_expkey_cache);
1632 cache_unregister(&svc_export_cache);
1638 * Flush exports table - called when last nfsd thread is killed
1641 nfsd_export_flush(void)
1644 cache_purge(&svc_expkey_cache);
1645 cache_purge(&svc_export_cache);
1650 * Shutdown the exports module.
1653 nfsd_export_shutdown(void)
1656 dprintk("nfsd: shutting down export module.\n");
1660 cache_unregister(&svc_expkey_cache);
1661 cache_unregister(&svc_export_cache);
1662 svcauth_unix_purge();
1665 dprintk("nfsd: export shutdown complete.\n");