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/unistd.h>
18 #include <linux/slab.h>
19 #include <linux/stat.h>
21 #include <linux/seq_file.h>
22 #include <linux/syscalls.h>
23 #include <linux/rwsem.h>
24 #include <linux/dcache.h>
25 #include <linux/namei.h>
26 #include <linux/mount.h>
27 #include <linux/hash.h>
28 #include <linux/module.h>
29 #include <linux/exportfs.h>
31 #include <linux/sunrpc/svc.h>
32 #include <linux/nfsd/nfsd.h>
33 #include <linux/nfsd/nfsfh.h>
34 #include <linux/nfsd/syscall.h>
35 #include <linux/lockd/bind.h>
37 #define NFSDDBG_FACILITY NFSDDBG_EXPORT
39 typedef struct auth_domain svc_client;
40 typedef struct svc_export svc_export;
42 static void exp_do_unexport(svc_export *unexp);
43 static int exp_verify_string(char *cp, int max);
47 * One maps client+vfsmnt+dentry to export options - the export map
48 * The other maps client+filehandle-fragment to export options. - the expkey map
50 * The export options are actually stored in the first map, and the
51 * second map contains a reference to the entry in the first map.
54 #define EXPKEY_HASHBITS 8
55 #define EXPKEY_HASHMAX (1 << EXPKEY_HASHBITS)
56 #define EXPKEY_HASHMASK (EXPKEY_HASHMAX -1)
57 static struct cache_head *expkey_table[EXPKEY_HASHMAX];
59 static void expkey_put(struct kref *ref)
61 struct svc_expkey *key = container_of(ref, struct svc_expkey, h.ref);
63 if (test_bit(CACHE_VALID, &key->h.flags) &&
64 !test_bit(CACHE_NEGATIVE, &key->h.flags)) {
68 auth_domain_put(key->ek_client);
72 static void expkey_request(struct cache_detail *cd,
74 char **bpp, int *blen)
76 /* client fsidtype \xfsid */
77 struct svc_expkey *ek = container_of(h, struct svc_expkey, h);
80 qword_add(bpp, blen, ek->ek_client->name);
81 snprintf(type, 5, "%d", ek->ek_fsidtype);
82 qword_add(bpp, blen, type);
83 qword_addhex(bpp, blen, (char*)ek->ek_fsid, key_len(ek->ek_fsidtype));
87 static struct svc_expkey *svc_expkey_update(struct svc_expkey *new, struct svc_expkey *old);
88 static struct svc_expkey *svc_expkey_lookup(struct svc_expkey *);
89 static struct cache_detail svc_expkey_cache;
91 static int expkey_parse(struct cache_detail *cd, char *mesg, int mlen)
93 /* client fsidtype fsid [path] */
96 struct auth_domain *dom = NULL;
100 struct svc_expkey key;
101 struct svc_expkey *ek;
103 if (mesg[mlen-1] != '\n')
107 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
112 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
116 dom = auth_domain_find(buf);
119 dprintk("found domain %s\n", buf);
122 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
124 fsidtype = simple_strtoul(buf, &ep, 10);
127 dprintk("found fsidtype %d\n", fsidtype);
128 if (key_len(fsidtype)==0) /* invalid type */
130 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
132 dprintk("found fsid length %d\n", len);
133 if (len != key_len(fsidtype))
136 /* OK, we seem to have a valid key */
138 key.h.expiry_time = get_expiry(&mesg);
139 if (key.h.expiry_time == 0)
143 key.ek_fsidtype = fsidtype;
144 memcpy(key.ek_fsid, buf, len);
146 ek = svc_expkey_lookup(&key);
151 /* now we want a pathname, or empty meaning NEGATIVE */
153 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) < 0)
155 dprintk("Path seems to be <%s>\n", buf);
158 set_bit(CACHE_NEGATIVE, &key.h.flags);
159 ek = svc_expkey_update(&key, ek);
161 cache_put(&ek->h, &svc_expkey_cache);
165 err = path_lookup(buf, 0, &nd);
169 dprintk("Found the path %s\n", buf);
171 key.ek_dentry = nd.dentry;
173 ek = svc_expkey_update(&key, ek);
175 cache_put(&ek->h, &svc_expkey_cache);
183 auth_domain_put(dom);
188 static int expkey_show(struct seq_file *m,
189 struct cache_detail *cd,
190 struct cache_head *h)
192 struct svc_expkey *ek ;
196 seq_puts(m, "#domain fsidtype fsid [path]\n");
199 ek = container_of(h, struct svc_expkey, h);
200 seq_printf(m, "%s %d 0x", ek->ek_client->name,
202 for (i=0; i < key_len(ek->ek_fsidtype)/4; i++)
203 seq_printf(m, "%08x", ek->ek_fsid[i]);
204 if (test_bit(CACHE_VALID, &h->flags) &&
205 !test_bit(CACHE_NEGATIVE, &h->flags)) {
207 seq_path(m, ek->ek_mnt, ek->ek_dentry, "\\ \t\n");
213 static inline int expkey_match (struct cache_head *a, struct cache_head *b)
215 struct svc_expkey *orig = container_of(a, struct svc_expkey, h);
216 struct svc_expkey *new = container_of(b, struct svc_expkey, h);
218 if (orig->ek_fsidtype != new->ek_fsidtype ||
219 orig->ek_client != new->ek_client ||
220 memcmp(orig->ek_fsid, new->ek_fsid, key_len(orig->ek_fsidtype)) != 0)
225 static inline void expkey_init(struct cache_head *cnew,
226 struct cache_head *citem)
228 struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
229 struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
231 kref_get(&item->ek_client->ref);
232 new->ek_client = item->ek_client;
233 new->ek_fsidtype = item->ek_fsidtype;
235 memcpy(new->ek_fsid, item->ek_fsid, sizeof(new->ek_fsid));
238 static inline void expkey_update(struct cache_head *cnew,
239 struct cache_head *citem)
241 struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
242 struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
244 new->ek_mnt = mntget(item->ek_mnt);
245 new->ek_dentry = dget(item->ek_dentry);
248 static struct cache_head *expkey_alloc(void)
250 struct svc_expkey *i = kmalloc(sizeof(*i), GFP_KERNEL);
257 static struct cache_detail svc_expkey_cache = {
258 .owner = THIS_MODULE,
259 .hash_size = EXPKEY_HASHMAX,
260 .hash_table = expkey_table,
262 .cache_put = expkey_put,
263 .cache_request = expkey_request,
264 .cache_parse = expkey_parse,
265 .cache_show = expkey_show,
266 .match = expkey_match,
268 .update = expkey_update,
269 .alloc = expkey_alloc,
272 static struct svc_expkey *
273 svc_expkey_lookup(struct svc_expkey *item)
275 struct cache_head *ch;
276 int hash = item->ek_fsidtype;
277 char * cp = (char*)item->ek_fsid;
278 int len = key_len(item->ek_fsidtype);
280 hash ^= hash_mem(cp, len, EXPKEY_HASHBITS);
281 hash ^= hash_ptr(item->ek_client, EXPKEY_HASHBITS);
282 hash &= EXPKEY_HASHMASK;
284 ch = sunrpc_cache_lookup(&svc_expkey_cache, &item->h,
287 return container_of(ch, struct svc_expkey, h);
292 static struct svc_expkey *
293 svc_expkey_update(struct svc_expkey *new, struct svc_expkey *old)
295 struct cache_head *ch;
296 int hash = new->ek_fsidtype;
297 char * cp = (char*)new->ek_fsid;
298 int len = key_len(new->ek_fsidtype);
300 hash ^= hash_mem(cp, len, EXPKEY_HASHBITS);
301 hash ^= hash_ptr(new->ek_client, EXPKEY_HASHBITS);
302 hash &= EXPKEY_HASHMASK;
304 ch = sunrpc_cache_update(&svc_expkey_cache, &new->h,
307 return container_of(ch, struct svc_expkey, h);
313 #define EXPORT_HASHBITS 8
314 #define EXPORT_HASHMAX (1<< EXPORT_HASHBITS)
315 #define EXPORT_HASHMASK (EXPORT_HASHMAX -1)
317 static struct cache_head *export_table[EXPORT_HASHMAX];
319 static void nfsd4_fslocs_free(struct nfsd4_fs_locations *fsloc)
323 for (i = 0; i < fsloc->locations_count; i++) {
324 kfree(fsloc->locations[i].path);
325 kfree(fsloc->locations[i].hosts);
327 kfree(fsloc->locations);
330 static void svc_export_put(struct kref *ref)
332 struct svc_export *exp = container_of(ref, struct svc_export, h.ref);
333 dput(exp->ex_dentry);
335 auth_domain_put(exp->ex_client);
337 nfsd4_fslocs_free(&exp->ex_fslocs);
341 static void svc_export_request(struct cache_detail *cd,
342 struct cache_head *h,
343 char **bpp, int *blen)
346 struct svc_export *exp = container_of(h, struct svc_export, h);
349 qword_add(bpp, blen, exp->ex_client->name);
350 pth = d_path(exp->ex_dentry, exp->ex_mnt, *bpp, *blen);
352 /* is this correct? */
356 qword_add(bpp, blen, pth);
360 static struct svc_export *svc_export_update(struct svc_export *new,
361 struct svc_export *old);
362 static struct svc_export *svc_export_lookup(struct svc_export *);
364 static int check_export(struct inode *inode, int flags, unsigned char *uuid)
367 /* We currently export only dirs and regular files.
368 * This is what umountd does.
370 if (!S_ISDIR(inode->i_mode) &&
371 !S_ISREG(inode->i_mode))
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");
387 if (!inode->i_sb->s_export_op) {
388 dprintk("exp_export: export of invalid fs type.\n");
392 /* Ok, we can export it */;
393 if (!inode->i_sb->s_export_op->find_exported_dentry)
394 inode->i_sb->s_export_op->find_exported_dentry =
395 find_exported_dentry;
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 #else /* CONFIG_NFSD_V4 */
456 static inline int fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc) { return 0; }
459 static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen)
461 /* client path expiry [flags anonuid anongid fsid] */
465 struct auth_domain *dom = NULL;
467 struct svc_export exp, *expp;
474 exp.ex_fslocs.locations = NULL;
475 exp.ex_fslocs.locations_count = 0;
476 exp.ex_fslocs.migrated = 0;
480 if (mesg[mlen-1] != '\n')
484 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
489 len = qword_get(&mesg, buf, PAGE_SIZE);
491 if (len <= 0) goto out;
494 dom = auth_domain_find(buf);
500 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
502 err = path_lookup(buf, 0, &nd);
503 if (err) goto out_no_path;
508 exp.ex_dentry = nd.dentry;
509 exp.ex_path = kstrdup(buf, GFP_KERNEL);
516 exp.h.expiry_time = get_expiry(&mesg);
517 if (exp.h.expiry_time == 0)
521 err = get_int(&mesg, &an_int);
523 set_bit(CACHE_NEGATIVE, &exp.h.flags);
525 if (err || an_int < 0) goto out;
526 exp.ex_flags= an_int;
529 err = get_int(&mesg, &an_int);
531 exp.ex_anon_uid= an_int;
534 err = get_int(&mesg, &an_int);
536 exp.ex_anon_gid= an_int;
539 err = get_int(&mesg, &an_int);
541 exp.ex_fsid = an_int;
543 while ((len = qword_get(&mesg, buf, PAGE_SIZE)) > 0) {
544 if (strcmp(buf, "fsloc") == 0)
545 err = fsloc_parse(&mesg, buf, &exp.ex_fslocs);
546 else if (strcmp(buf, "uuid") == 0) {
547 /* expect a 16 byte uuid encoded as \xXXXX... */
548 len = qword_get(&mesg, buf, PAGE_SIZE);
553 kmemdup(buf, 16, GFP_KERNEL);
554 if (exp.ex_uuid == NULL)
558 /* quietly ignore unknown words and anything
559 * following. Newer user-space can try to set
560 * new values, then see what the result was.
567 err = check_export(nd.dentry->d_inode, exp.ex_flags,
572 expp = svc_export_lookup(&exp);
574 expp = svc_export_update(&exp, expp);
583 nfsd4_fslocs_free(&exp.ex_fslocs);
590 auth_domain_put(dom);
595 static void exp_flags(struct seq_file *m, int flag, int fsid,
596 uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fslocs);
598 static int svc_export_show(struct seq_file *m,
599 struct cache_detail *cd,
600 struct cache_head *h)
602 struct svc_export *exp ;
605 seq_puts(m, "#path domain(flags)\n");
608 exp = container_of(h, struct svc_export, h);
609 seq_path(m, exp->ex_mnt, exp->ex_dentry, " \t\n\\");
611 seq_escape(m, exp->ex_client->name, " \t\n\\");
613 if (test_bit(CACHE_VALID, &h->flags) &&
614 !test_bit(CACHE_NEGATIVE, &h->flags)) {
615 exp_flags(m, exp->ex_flags, exp->ex_fsid,
616 exp->ex_anon_uid, exp->ex_anon_gid, &exp->ex_fslocs);
619 seq_puts(m, ",uuid=");
620 for (i=0; i<16; i++) {
623 seq_printf(m, "%02x", exp->ex_uuid[i]);
630 static int svc_export_match(struct cache_head *a, struct cache_head *b)
632 struct svc_export *orig = container_of(a, struct svc_export, h);
633 struct svc_export *new = container_of(b, struct svc_export, h);
634 return orig->ex_client == new->ex_client &&
635 orig->ex_dentry == new->ex_dentry &&
636 orig->ex_mnt == new->ex_mnt;
639 static void svc_export_init(struct cache_head *cnew, struct cache_head *citem)
641 struct svc_export *new = container_of(cnew, struct svc_export, h);
642 struct svc_export *item = container_of(citem, struct svc_export, h);
644 kref_get(&item->ex_client->ref);
645 new->ex_client = item->ex_client;
646 new->ex_dentry = dget(item->ex_dentry);
647 new->ex_mnt = mntget(item->ex_mnt);
649 new->ex_fslocs.locations = NULL;
650 new->ex_fslocs.locations_count = 0;
651 new->ex_fslocs.migrated = 0;
654 static void export_update(struct cache_head *cnew, struct cache_head *citem)
656 struct svc_export *new = container_of(cnew, struct svc_export, h);
657 struct svc_export *item = container_of(citem, struct svc_export, h);
659 new->ex_flags = item->ex_flags;
660 new->ex_anon_uid = item->ex_anon_uid;
661 new->ex_anon_gid = item->ex_anon_gid;
662 new->ex_fsid = item->ex_fsid;
663 new->ex_uuid = item->ex_uuid;
664 item->ex_uuid = NULL;
665 new->ex_path = item->ex_path;
666 item->ex_path = NULL;
667 new->ex_fslocs.locations = item->ex_fslocs.locations;
668 item->ex_fslocs.locations = NULL;
669 new->ex_fslocs.locations_count = item->ex_fslocs.locations_count;
670 item->ex_fslocs.locations_count = 0;
671 new->ex_fslocs.migrated = item->ex_fslocs.migrated;
672 item->ex_fslocs.migrated = 0;
675 static struct cache_head *svc_export_alloc(void)
677 struct svc_export *i = kmalloc(sizeof(*i), GFP_KERNEL);
684 struct cache_detail svc_export_cache = {
685 .owner = THIS_MODULE,
686 .hash_size = EXPORT_HASHMAX,
687 .hash_table = export_table,
688 .name = "nfsd.export",
689 .cache_put = svc_export_put,
690 .cache_request = svc_export_request,
691 .cache_parse = svc_export_parse,
692 .cache_show = svc_export_show,
693 .match = svc_export_match,
694 .init = svc_export_init,
695 .update = export_update,
696 .alloc = svc_export_alloc,
699 static struct svc_export *
700 svc_export_lookup(struct svc_export *exp)
702 struct cache_head *ch;
704 hash = hash_ptr(exp->ex_client, EXPORT_HASHBITS);
705 hash ^= hash_ptr(exp->ex_dentry, EXPORT_HASHBITS);
706 hash ^= hash_ptr(exp->ex_mnt, EXPORT_HASHBITS);
708 ch = sunrpc_cache_lookup(&svc_export_cache, &exp->h,
711 return container_of(ch, struct svc_export, h);
716 static struct svc_export *
717 svc_export_update(struct svc_export *new, struct svc_export *old)
719 struct cache_head *ch;
721 hash = hash_ptr(old->ex_client, EXPORT_HASHBITS);
722 hash ^= hash_ptr(old->ex_dentry, EXPORT_HASHBITS);
723 hash ^= hash_ptr(old->ex_mnt, EXPORT_HASHBITS);
725 ch = sunrpc_cache_update(&svc_export_cache, &new->h,
729 return container_of(ch, struct svc_export, h);
735 static struct svc_expkey *
736 exp_find_key(svc_client *clp, int fsid_type, u32 *fsidv, struct cache_req *reqp)
738 struct svc_expkey key, *ek;
745 key.ek_fsidtype = fsid_type;
746 memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
748 ek = svc_expkey_lookup(&key);
750 if ((err = cache_check(&svc_expkey_cache, &ek->h, reqp)))
755 static int exp_set_key(svc_client *clp, int fsid_type, u32 *fsidv,
756 struct svc_export *exp)
758 struct svc_expkey key, *ek;
761 key.ek_fsidtype = fsid_type;
762 memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
763 key.ek_mnt = exp->ex_mnt;
764 key.ek_dentry = exp->ex_dentry;
765 key.h.expiry_time = NEVER;
768 ek = svc_expkey_lookup(&key);
770 ek = svc_expkey_update(&key,ek);
772 cache_put(&ek->h, &svc_expkey_cache);
779 * Find the client's export entry matching xdev/xino.
781 static inline struct svc_expkey *
782 exp_get_key(svc_client *clp, dev_t dev, ino_t ino)
786 if (old_valid_dev(dev)) {
787 mk_fsid(FSID_DEV, fsidv, dev, ino, 0, NULL);
788 return exp_find_key(clp, FSID_DEV, fsidv, NULL);
790 mk_fsid(FSID_ENCODE_DEV, fsidv, dev, ino, 0, NULL);
791 return exp_find_key(clp, FSID_ENCODE_DEV, fsidv, NULL);
795 * Find the client's export entry matching fsid
797 static inline struct svc_expkey *
798 exp_get_fsid_key(svc_client *clp, int fsid)
802 mk_fsid(FSID_NUM, fsidv, 0, 0, fsid, NULL);
804 return exp_find_key(clp, FSID_NUM, fsidv, NULL);
808 exp_get_by_name(svc_client *clp, struct vfsmount *mnt, struct dentry *dentry,
809 struct cache_req *reqp)
811 struct svc_export *exp, key;
818 key.ex_dentry = dentry;
820 exp = svc_export_lookup(&key);
824 err = cache_check(&svc_export_cache, &exp->h, reqp);
840 * Find the export entry for a given dentry.
843 exp_parent(svc_client *clp, struct vfsmount *mnt, struct dentry *dentry,
844 struct cache_req *reqp)
849 exp = exp_get_by_name(clp, mnt, dentry, reqp);
851 while (exp == NULL && !IS_ROOT(dentry)) {
852 struct dentry *parent;
854 parent = dget_parent(dentry);
857 exp = exp_get_by_name(clp, mnt, dentry, reqp);
864 * Hashtable locking. Write locks are placed only by user processes
865 * wanting to modify export information.
866 * Write locking only done in this file. Read locking
870 static DECLARE_RWSEM(hash_sem);
875 down_read(&hash_sem);
881 down_write(&hash_sem);
891 exp_writeunlock(void)
896 static void exp_fsid_unhash(struct svc_export *exp)
898 struct svc_expkey *ek;
900 if ((exp->ex_flags & NFSEXP_FSID) == 0)
903 ek = exp_get_fsid_key(exp->ex_client, exp->ex_fsid);
904 if (ek && !IS_ERR(ek)) {
905 ek->h.expiry_time = get_seconds()-1;
906 cache_put(&ek->h, &svc_expkey_cache);
908 svc_expkey_cache.nextcheck = get_seconds();
911 static int exp_fsid_hash(svc_client *clp, struct svc_export *exp)
915 if ((exp->ex_flags & NFSEXP_FSID) == 0)
918 mk_fsid(FSID_NUM, fsid, 0, 0, exp->ex_fsid, NULL);
919 return exp_set_key(clp, FSID_NUM, fsid, exp);
922 static int exp_hash(struct auth_domain *clp, struct svc_export *exp)
925 struct inode *inode = exp->ex_dentry->d_inode;
926 dev_t dev = inode->i_sb->s_dev;
928 if (old_valid_dev(dev)) {
929 mk_fsid(FSID_DEV, fsid, dev, inode->i_ino, 0, NULL);
930 return exp_set_key(clp, FSID_DEV, fsid, exp);
932 mk_fsid(FSID_ENCODE_DEV, fsid, dev, inode->i_ino, 0, NULL);
933 return exp_set_key(clp, FSID_ENCODE_DEV, fsid, exp);
936 static void exp_unhash(struct svc_export *exp)
938 struct svc_expkey *ek;
939 struct inode *inode = exp->ex_dentry->d_inode;
941 ek = exp_get_key(exp->ex_client, inode->i_sb->s_dev, inode->i_ino);
942 if (ek && !IS_ERR(ek)) {
943 ek->h.expiry_time = get_seconds()-1;
944 cache_put(&ek->h, &svc_expkey_cache);
946 svc_expkey_cache.nextcheck = get_seconds();
950 * Export a file system.
953 exp_export(struct nfsctl_export *nxp)
956 struct svc_export *exp = NULL;
957 struct svc_export new;
958 struct svc_expkey *fsid_key = NULL;
962 /* Consistency check */
964 if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) ||
965 !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX))
968 dprintk("exp_export called for %s:%s (%x/%ld fl %x).\n",
969 nxp->ex_client, nxp->ex_path,
970 (unsigned)nxp->ex_dev, (long)nxp->ex_ino,
973 /* Try to lock the export table for update */
976 /* Look up client info */
977 if (!(clp = auth_domain_find(nxp->ex_client)))
981 /* Look up the dentry */
982 err = path_lookup(nxp->ex_path, 0, &nd);
987 exp = exp_get_by_name(clp, nd.mnt, nd.dentry, NULL);
989 memset(&new, 0, sizeof(new));
991 /* must make sure there won't be an ex_fsid clash */
992 if ((nxp->ex_flags & NFSEXP_FSID) &&
993 (fsid_key = exp_get_fsid_key(clp, nxp->ex_dev)) &&
996 (fsid_key->ek_mnt != nd.mnt || fsid_key->ek_dentry != nd.dentry) )
1000 /* just a flags/id/fsid update */
1002 exp_fsid_unhash(exp);
1003 exp->ex_flags = nxp->ex_flags;
1004 exp->ex_anon_uid = nxp->ex_anon_uid;
1005 exp->ex_anon_gid = nxp->ex_anon_gid;
1006 exp->ex_fsid = nxp->ex_dev;
1008 err = exp_fsid_hash(clp, exp);
1012 err = check_export(nd.dentry->d_inode, nxp->ex_flags, NULL);
1013 if (err) goto finish;
1017 dprintk("nfsd: creating export entry %p for client %p\n", exp, clp);
1019 new.h.expiry_time = NEVER;
1021 new.ex_path = kstrdup(nxp->ex_path, GFP_KERNEL);
1024 new.ex_client = clp;
1025 new.ex_mnt = nd.mnt;
1026 new.ex_dentry = nd.dentry;
1027 new.ex_flags = nxp->ex_flags;
1028 new.ex_anon_uid = nxp->ex_anon_uid;
1029 new.ex_anon_gid = nxp->ex_anon_gid;
1030 new.ex_fsid = nxp->ex_dev;
1032 exp = svc_export_lookup(&new);
1034 exp = svc_export_update(&new, exp);
1039 if (exp_hash(clp, exp) ||
1040 exp_fsid_hash(clp, exp)) {
1041 /* failed to create at least one index */
1042 exp_do_unexport(exp);
1051 if (fsid_key && !IS_ERR(fsid_key))
1052 cache_put(&fsid_key->h, &svc_expkey_cache);
1054 auth_domain_put(clp);
1063 * Unexport a file system. The export entry has already
1064 * been removed from the client's list of exported fs's.
1067 exp_do_unexport(svc_export *unexp)
1069 unexp->h.expiry_time = get_seconds()-1;
1070 svc_export_cache.nextcheck = get_seconds();
1072 exp_fsid_unhash(unexp);
1080 exp_unexport(struct nfsctl_export *nxp)
1082 struct auth_domain *dom;
1084 struct nameidata nd;
1087 /* Consistency check */
1088 if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) ||
1089 !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX))
1095 dom = auth_domain_find(nxp->ex_client);
1097 dprintk("nfsd: unexport couldn't find %s\n", nxp->ex_client);
1101 err = path_lookup(nxp->ex_path, 0, &nd);
1106 exp = exp_get_by_name(dom, nd.mnt, nd.dentry, NULL);
1111 exp_do_unexport(exp);
1116 auth_domain_put(dom);
1124 * Obtain the root fh on behalf of a client.
1125 * This could be done in user space, but I feel that it adds some safety
1126 * since its harder to fool a kernel module than a user space program.
1129 exp_rootfh(svc_client *clp, char *path, struct knfsd_fh *f, int maxsize)
1131 struct svc_export *exp;
1132 struct nameidata nd;
1133 struct inode *inode;
1138 /* NB: we probably ought to check that it's NUL-terminated */
1139 if (path_lookup(path, 0, &nd)) {
1140 printk("nfsd: exp_rootfh path not found %s", path);
1143 inode = nd.dentry->d_inode;
1145 dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n",
1146 path, nd.dentry, clp->name,
1147 inode->i_sb->s_id, inode->i_ino);
1148 exp = exp_parent(clp, nd.mnt, nd.dentry, NULL);
1154 dprintk("nfsd: exp_rootfh export not found.\n");
1159 * fh must be initialized before calling fh_compose
1161 fh_init(&fh, maxsize);
1162 if (fh_compose(&fh, exp, nd.dentry, NULL))
1166 memcpy(f, &fh.fh_handle, sizeof(struct knfsd_fh));
1175 exp_find(struct auth_domain *clp, int fsid_type, u32 *fsidv,
1176 struct cache_req *reqp)
1178 struct svc_export *exp;
1179 struct svc_expkey *ek = exp_find_key(clp, fsid_type, fsidv, reqp);
1180 if (!ek || IS_ERR(ek))
1181 return ERR_PTR(PTR_ERR(ek));
1183 exp = exp_get_by_name(clp, ek->ek_mnt, ek->ek_dentry, reqp);
1184 cache_put(&ek->h, &svc_expkey_cache);
1186 if (!exp || IS_ERR(exp))
1187 return ERR_PTR(PTR_ERR(exp));
1193 * Called when we need the filehandle for the root of the pseudofs,
1194 * for a given NFSv4 client. The root is defined to be the
1195 * export point with fsid==0
1198 exp_pseudoroot(struct auth_domain *clp, struct svc_fh *fhp,
1199 struct cache_req *creq)
1201 struct svc_export *exp;
1205 mk_fsid(FSID_NUM, fsidv, 0, 0, 0, NULL);
1207 exp = exp_find(clp, FSID_NUM, fsidv, creq);
1209 return nfserrno(PTR_ERR(exp));
1212 rv = fh_compose(fhp, exp, exp->ex_dentry, NULL);
1219 static void *e_start(struct seq_file *m, loff_t *pos)
1220 __acquires(svc_export_cache.hash_lock)
1223 unsigned hash, export;
1224 struct cache_head *ch;
1227 read_lock(&svc_export_cache.hash_lock);
1229 return SEQ_START_TOKEN;
1231 export = n & ((1LL<<32) - 1);
1234 for (ch=export_table[hash]; ch; ch=ch->next)
1237 n &= ~((1LL<<32) - 1);
1241 } while(hash < EXPORT_HASHMAX && export_table[hash]==NULL);
1242 if (hash >= EXPORT_HASHMAX)
1245 return export_table[hash];
1248 static void *e_next(struct seq_file *m, void *p, loff_t *pos)
1250 struct cache_head *ch = p;
1251 int hash = (*pos >> 32);
1253 if (p == SEQ_START_TOKEN)
1255 else if (ch->next == NULL) {
1262 *pos &= ~((1LL<<32) - 1);
1263 while (hash < EXPORT_HASHMAX && export_table[hash] == NULL) {
1267 if (hash >= EXPORT_HASHMAX)
1270 return export_table[hash];
1273 static void e_stop(struct seq_file *m, void *p)
1274 __releases(svc_export_cache.hash_lock)
1276 read_unlock(&svc_export_cache.hash_lock);
1280 static struct flags {
1284 { NFSEXP_READONLY, {"ro", "rw"}},
1285 { NFSEXP_INSECURE_PORT, {"insecure", ""}},
1286 { NFSEXP_ROOTSQUASH, {"root_squash", "no_root_squash"}},
1287 { NFSEXP_ALLSQUASH, {"all_squash", ""}},
1288 { NFSEXP_ASYNC, {"async", "sync"}},
1289 { NFSEXP_GATHERED_WRITES, {"wdelay", "no_wdelay"}},
1290 { NFSEXP_NOHIDE, {"nohide", ""}},
1291 { NFSEXP_CROSSMOUNT, {"crossmnt", ""}},
1292 { NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}},
1293 { NFSEXP_NOAUTHNLM, {"insecure_locks", ""}},
1295 { NFSEXP_MSNFS, {"msnfs", ""}},
1300 static void exp_flags(struct seq_file *m, int flag, int fsid,
1301 uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fsloc)
1306 for (flg = expflags; flg->flag; flg++) {
1307 int state = (flg->flag & flag)?0:1;
1308 if (*flg->name[state])
1309 seq_printf(m, "%s%s", first++?",":"", flg->name[state]);
1311 if (flag & NFSEXP_FSID)
1312 seq_printf(m, "%sfsid=%d", first++?",":"", fsid);
1313 if (anonu != (uid_t)-2 && anonu != (0x10000-2))
1314 seq_printf(m, "%sanonuid=%d", first++?",":"", anonu);
1315 if (anong != (gid_t)-2 && anong != (0x10000-2))
1316 seq_printf(m, "%sanongid=%d", first++?",":"", anong);
1317 if (fsloc && fsloc->locations_count > 0) {
1318 char *loctype = (fsloc->migrated) ? "refer" : "replicas";
1321 seq_printf(m, "%s%s=", first++?",":"", loctype);
1322 seq_escape(m, fsloc->locations[0].path, ",;@ \t\n\\");
1324 seq_escape(m, fsloc->locations[0].hosts, ",;@ \t\n\\");
1325 for (i = 1; i < fsloc->locations_count; i++) {
1327 seq_escape(m, fsloc->locations[i].path, ",;@ \t\n\\");
1329 seq_escape(m, fsloc->locations[i].hosts, ",;@ \t\n\\");
1334 static int e_show(struct seq_file *m, void *p)
1336 struct cache_head *cp = p;
1337 struct svc_export *exp = container_of(cp, struct svc_export, h);
1339 if (p == SEQ_START_TOKEN) {
1340 seq_puts(m, "# Version 1.1\n");
1341 seq_puts(m, "# Path Client(Flags) # IPs\n");
1346 if (cache_check(&svc_export_cache, &exp->h, NULL))
1348 cache_put(&exp->h, &svc_export_cache);
1349 return svc_export_show(m, &svc_export_cache, cp);
1352 struct seq_operations nfs_exports_op = {
1360 * Add or modify a client.
1361 * Change requests may involve the list of host addresses. The list of
1362 * exports and possibly existing uid maps are left untouched.
1365 exp_addclient(struct nfsctl_client *ncp)
1367 struct auth_domain *dom;
1370 /* First, consistency check. */
1372 if (! exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX))
1374 if (ncp->cl_naddr > NFSCLNT_ADDRMAX)
1377 /* Lock the hashtable */
1380 dom = unix_domain_find(ncp->cl_ident);
1386 /* Insert client into hashtable. */
1387 for (i = 0; i < ncp->cl_naddr; i++)
1388 auth_unix_add_addr(ncp->cl_addrlist[i], dom);
1390 auth_unix_forget_old(dom);
1391 auth_domain_put(dom);
1402 * Delete a client given an identifier.
1405 exp_delclient(struct nfsctl_client *ncp)
1408 struct auth_domain *dom;
1411 if (!exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX))
1414 /* Lock the hashtable */
1417 dom = auth_domain_find(ncp->cl_ident);
1418 /* just make sure that no addresses work
1419 * and that it will expire soon
1422 err = auth_unix_forget_old(dom);
1423 auth_domain_put(dom);
1432 * Verify that string is non-empty and does not exceed max length.
1435 exp_verify_string(char *cp, int max)
1439 for (i = 0; i < max; i++)
1443 printk(KERN_NOTICE "nfsd: couldn't validate string %s\n", cp);
1448 * Initialize the exports module.
1451 nfsd_export_init(void)
1453 dprintk("nfsd: initializing export module.\n");
1455 cache_register(&svc_export_cache);
1456 cache_register(&svc_expkey_cache);
1461 * Flush exports table - called when last nfsd thread is killed
1464 nfsd_export_flush(void)
1467 cache_purge(&svc_expkey_cache);
1468 cache_purge(&svc_export_cache);
1473 * Shutdown the exports module.
1476 nfsd_export_shutdown(void)
1479 dprintk("nfsd: shutting down export module.\n");
1483 if (cache_unregister(&svc_expkey_cache))
1484 printk(KERN_ERR "nfsd: failed to unregister expkey cache\n");
1485 if (cache_unregister(&svc_export_cache))
1486 printk(KERN_ERR "nfsd: failed to unregister export cache\n");
1487 svcauth_unix_purge();
1490 dprintk("nfsd: export shutdown complete.\n");