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/sched.h>
20 #include <linux/stat.h>
22 #include <linux/seq_file.h>
23 #include <linux/syscalls.h>
24 #include <linux/rwsem.h>
25 #include <linux/dcache.h>
26 #include <linux/namei.h>
27 #include <linux/mount.h>
28 #include <linux/hash.h>
29 #include <linux/module.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 ;
195 seq_puts(m, "#domain fsidtype fsid [path]\n");
198 ek = container_of(h, struct svc_expkey, h);
199 seq_printf(m, "%s %d 0x%08x", ek->ek_client->name,
200 ek->ek_fsidtype, ek->ek_fsid[0]);
201 if (ek->ek_fsidtype != 1)
202 seq_printf(m, "%08x", ek->ek_fsid[1]);
203 if (ek->ek_fsidtype == 2)
204 seq_printf(m, "%08x", ek->ek_fsid[2]);
205 if (test_bit(CACHE_VALID, &h->flags) &&
206 !test_bit(CACHE_NEGATIVE, &h->flags)) {
208 seq_path(m, ek->ek_mnt, ek->ek_dentry, "\\ \t\n");
214 static inline int expkey_match (struct cache_head *a, struct cache_head *b)
216 struct svc_expkey *orig = container_of(a, struct svc_expkey, h);
217 struct svc_expkey *new = container_of(b, struct svc_expkey, h);
219 if (orig->ek_fsidtype != new->ek_fsidtype ||
220 orig->ek_client != new->ek_client ||
221 memcmp(orig->ek_fsid, new->ek_fsid, key_len(orig->ek_fsidtype)) != 0)
226 static inline void expkey_init(struct cache_head *cnew,
227 struct cache_head *citem)
229 struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
230 struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
232 kref_get(&item->ek_client->ref);
233 new->ek_client = item->ek_client;
234 new->ek_fsidtype = item->ek_fsidtype;
235 new->ek_fsid[0] = item->ek_fsid[0];
236 new->ek_fsid[1] = item->ek_fsid[1];
237 new->ek_fsid[2] = item->ek_fsid[2];
240 static inline void expkey_update(struct cache_head *cnew,
241 struct cache_head *citem)
243 struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
244 struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
246 new->ek_mnt = mntget(item->ek_mnt);
247 new->ek_dentry = dget(item->ek_dentry);
250 static struct cache_head *expkey_alloc(void)
252 struct svc_expkey *i = kmalloc(sizeof(*i), GFP_KERNEL);
259 static struct cache_detail svc_expkey_cache = {
260 .owner = THIS_MODULE,
261 .hash_size = EXPKEY_HASHMAX,
262 .hash_table = expkey_table,
264 .cache_put = expkey_put,
265 .cache_request = expkey_request,
266 .cache_parse = expkey_parse,
267 .cache_show = expkey_show,
268 .match = expkey_match,
270 .update = expkey_update,
271 .alloc = expkey_alloc,
274 static struct svc_expkey *
275 svc_expkey_lookup(struct svc_expkey *item)
277 struct cache_head *ch;
278 int hash = item->ek_fsidtype;
279 char * cp = (char*)item->ek_fsid;
280 int len = key_len(item->ek_fsidtype);
282 hash ^= hash_mem(cp, len, EXPKEY_HASHBITS);
283 hash ^= hash_ptr(item->ek_client, EXPKEY_HASHBITS);
284 hash &= EXPKEY_HASHMASK;
286 ch = sunrpc_cache_lookup(&svc_expkey_cache, &item->h,
289 return container_of(ch, struct svc_expkey, h);
294 static struct svc_expkey *
295 svc_expkey_update(struct svc_expkey *new, struct svc_expkey *old)
297 struct cache_head *ch;
298 int hash = new->ek_fsidtype;
299 char * cp = (char*)new->ek_fsid;
300 int len = key_len(new->ek_fsidtype);
302 hash ^= hash_mem(cp, len, EXPKEY_HASHBITS);
303 hash ^= hash_ptr(new->ek_client, EXPKEY_HASHBITS);
304 hash &= EXPKEY_HASHMASK;
306 ch = sunrpc_cache_update(&svc_expkey_cache, &new->h,
309 return container_of(ch, struct svc_expkey, h);
315 #define EXPORT_HASHBITS 8
316 #define EXPORT_HASHMAX (1<< EXPORT_HASHBITS)
317 #define EXPORT_HASHMASK (EXPORT_HASHMAX -1)
319 static struct cache_head *export_table[EXPORT_HASHMAX];
321 static void nfsd4_fslocs_free(struct nfsd4_fs_locations *fsloc)
325 for (i = 0; i < fsloc->locations_count; i++) {
326 kfree(fsloc->locations[i].path);
327 kfree(fsloc->locations[i].hosts);
329 kfree(fsloc->locations);
332 static void svc_export_put(struct kref *ref)
334 struct svc_export *exp = container_of(ref, struct svc_export, h.ref);
335 dput(exp->ex_dentry);
337 auth_domain_put(exp->ex_client);
339 nfsd4_fslocs_free(&exp->ex_fslocs);
343 static void svc_export_request(struct cache_detail *cd,
344 struct cache_head *h,
345 char **bpp, int *blen)
348 struct svc_export *exp = container_of(h, struct svc_export, h);
351 qword_add(bpp, blen, exp->ex_client->name);
352 pth = d_path(exp->ex_dentry, exp->ex_mnt, *bpp, *blen);
354 /* is this correct? */
358 qword_add(bpp, blen, pth);
362 static struct svc_export *svc_export_update(struct svc_export *new,
363 struct svc_export *old);
364 static struct svc_export *svc_export_lookup(struct svc_export *);
366 static int check_export(struct inode *inode, int flags)
369 /* We currently export only dirs and regular files.
370 * This is what umountd does.
372 if (!S_ISDIR(inode->i_mode) &&
373 !S_ISREG(inode->i_mode))
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 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)) {
385 dprintk("exp_export: export of non-dev fs without fsid\n");
388 if (!inode->i_sb->s_export_op) {
389 dprintk("exp_export: export of invalid fs type.\n");
393 /* Ok, we can export it */;
394 if (!inode->i_sb->s_export_op->find_exported_dentry)
395 inode->i_sb->s_export_op->find_exported_dentry =
396 find_exported_dentry;
401 #ifdef CONFIG_NFSD_V4
404 fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc)
407 int migrated, i, err;
409 len = qword_get(mesg, buf, PAGE_SIZE);
410 if (len != 5 || memcmp(buf, "fsloc", 5))
414 err = get_int(mesg, &fsloc->locations_count);
417 if (fsloc->locations_count > MAX_FS_LOCATIONS)
419 if (fsloc->locations_count == 0)
422 fsloc->locations = kzalloc(fsloc->locations_count
423 * sizeof(struct nfsd4_fs_location), GFP_KERNEL);
424 if (!fsloc->locations)
426 for (i=0; i < fsloc->locations_count; i++) {
427 /* colon separated host list */
429 len = qword_get(mesg, buf, PAGE_SIZE);
433 fsloc->locations[i].hosts = kstrdup(buf, GFP_KERNEL);
434 if (!fsloc->locations[i].hosts)
437 /* slash separated path component list */
438 len = qword_get(mesg, buf, PAGE_SIZE);
442 fsloc->locations[i].path = kstrdup(buf, GFP_KERNEL);
443 if (!fsloc->locations[i].path)
447 err = get_int(mesg, &migrated);
451 if (migrated < 0 || migrated > 1)
453 fsloc->migrated = migrated;
456 nfsd4_fslocs_free(fsloc);
460 #else /* CONFIG_NFSD_V4 */
461 static inline int fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc) { return 0; }
464 static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen)
466 /* client path expiry [flags anonuid anongid fsid] */
470 struct auth_domain *dom = NULL;
472 struct svc_export exp, *expp;
478 if (mesg[mlen-1] != '\n')
482 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
487 len = qword_get(&mesg, buf, PAGE_SIZE);
489 if (len <= 0) goto out;
492 dom = auth_domain_find(buf);
498 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
500 err = path_lookup(buf, 0, &nd);
501 if (err) goto out_no_path;
506 exp.ex_dentry = nd.dentry;
507 exp.ex_path = kstrdup(buf, GFP_KERNEL);
514 exp.h.expiry_time = get_expiry(&mesg);
515 if (exp.h.expiry_time == 0)
519 exp.ex_fslocs.locations = NULL;
520 exp.ex_fslocs.locations_count = 0;
521 exp.ex_fslocs.migrated = 0;
524 err = get_int(&mesg, &an_int);
526 set_bit(CACHE_NEGATIVE, &exp.h.flags);
528 if (err || an_int < 0) goto out;
529 exp.ex_flags= an_int;
532 err = get_int(&mesg, &an_int);
534 exp.ex_anon_uid= an_int;
537 err = get_int(&mesg, &an_int);
539 exp.ex_anon_gid= an_int;
542 err = get_int(&mesg, &an_int);
544 exp.ex_fsid = an_int;
546 err = check_export(nd.dentry->d_inode, exp.ex_flags);
549 err = fsloc_parse(&mesg, buf, &exp.ex_fslocs);
554 expp = svc_export_lookup(&exp);
556 expp = svc_export_update(&exp, expp);
570 auth_domain_put(dom);
575 static void exp_flags(struct seq_file *m, int flag, int fsid,
576 uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fslocs);
578 static int svc_export_show(struct seq_file *m,
579 struct cache_detail *cd,
580 struct cache_head *h)
582 struct svc_export *exp ;
585 seq_puts(m, "#path domain(flags)\n");
588 exp = container_of(h, struct svc_export, h);
589 seq_path(m, exp->ex_mnt, exp->ex_dentry, " \t\n\\");
591 seq_escape(m, exp->ex_client->name, " \t\n\\");
593 if (test_bit(CACHE_VALID, &h->flags) &&
594 !test_bit(CACHE_NEGATIVE, &h->flags))
595 exp_flags(m, exp->ex_flags, exp->ex_fsid,
596 exp->ex_anon_uid, exp->ex_anon_gid, &exp->ex_fslocs);
600 static int svc_export_match(struct cache_head *a, struct cache_head *b)
602 struct svc_export *orig = container_of(a, struct svc_export, h);
603 struct svc_export *new = container_of(b, struct svc_export, h);
604 return orig->ex_client == new->ex_client &&
605 orig->ex_dentry == new->ex_dentry &&
606 orig->ex_mnt == new->ex_mnt;
609 static void svc_export_init(struct cache_head *cnew, struct cache_head *citem)
611 struct svc_export *new = container_of(cnew, struct svc_export, h);
612 struct svc_export *item = container_of(citem, struct svc_export, h);
614 kref_get(&item->ex_client->ref);
615 new->ex_client = item->ex_client;
616 new->ex_dentry = dget(item->ex_dentry);
617 new->ex_mnt = mntget(item->ex_mnt);
619 new->ex_fslocs.locations = NULL;
620 new->ex_fslocs.locations_count = 0;
621 new->ex_fslocs.migrated = 0;
624 static void export_update(struct cache_head *cnew, struct cache_head *citem)
626 struct svc_export *new = container_of(cnew, struct svc_export, h);
627 struct svc_export *item = container_of(citem, struct svc_export, h);
629 new->ex_flags = item->ex_flags;
630 new->ex_anon_uid = item->ex_anon_uid;
631 new->ex_anon_gid = item->ex_anon_gid;
632 new->ex_fsid = item->ex_fsid;
633 new->ex_path = item->ex_path;
634 item->ex_path = NULL;
635 new->ex_fslocs.locations = item->ex_fslocs.locations;
636 item->ex_fslocs.locations = NULL;
637 new->ex_fslocs.locations_count = item->ex_fslocs.locations_count;
638 item->ex_fslocs.locations_count = 0;
639 new->ex_fslocs.migrated = item->ex_fslocs.migrated;
640 item->ex_fslocs.migrated = 0;
643 static struct cache_head *svc_export_alloc(void)
645 struct svc_export *i = kmalloc(sizeof(*i), GFP_KERNEL);
652 struct cache_detail svc_export_cache = {
653 .owner = THIS_MODULE,
654 .hash_size = EXPORT_HASHMAX,
655 .hash_table = export_table,
656 .name = "nfsd.export",
657 .cache_put = svc_export_put,
658 .cache_request = svc_export_request,
659 .cache_parse = svc_export_parse,
660 .cache_show = svc_export_show,
661 .match = svc_export_match,
662 .init = svc_export_init,
663 .update = export_update,
664 .alloc = svc_export_alloc,
667 static struct svc_export *
668 svc_export_lookup(struct svc_export *exp)
670 struct cache_head *ch;
672 hash = hash_ptr(exp->ex_client, EXPORT_HASHBITS);
673 hash ^= hash_ptr(exp->ex_dentry, EXPORT_HASHBITS);
674 hash ^= hash_ptr(exp->ex_mnt, EXPORT_HASHBITS);
676 ch = sunrpc_cache_lookup(&svc_export_cache, &exp->h,
679 return container_of(ch, struct svc_export, h);
684 static struct svc_export *
685 svc_export_update(struct svc_export *new, struct svc_export *old)
687 struct cache_head *ch;
689 hash = hash_ptr(old->ex_client, EXPORT_HASHBITS);
690 hash ^= hash_ptr(old->ex_dentry, EXPORT_HASHBITS);
691 hash ^= hash_ptr(old->ex_mnt, EXPORT_HASHBITS);
693 ch = sunrpc_cache_update(&svc_export_cache, &new->h,
697 return container_of(ch, struct svc_export, h);
703 static struct svc_expkey *
704 exp_find_key(svc_client *clp, int fsid_type, u32 *fsidv, struct cache_req *reqp)
706 struct svc_expkey key, *ek;
713 key.ek_fsidtype = fsid_type;
714 memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
716 ek = svc_expkey_lookup(&key);
718 if ((err = cache_check(&svc_expkey_cache, &ek->h, reqp)))
723 static int exp_set_key(svc_client *clp, int fsid_type, u32 *fsidv,
724 struct svc_export *exp)
726 struct svc_expkey key, *ek;
729 key.ek_fsidtype = fsid_type;
730 memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
731 key.ek_mnt = exp->ex_mnt;
732 key.ek_dentry = exp->ex_dentry;
733 key.h.expiry_time = NEVER;
736 ek = svc_expkey_lookup(&key);
738 ek = svc_expkey_update(&key,ek);
740 cache_put(&ek->h, &svc_expkey_cache);
747 * Find the client's export entry matching xdev/xino.
749 static inline struct svc_expkey *
750 exp_get_key(svc_client *clp, dev_t dev, ino_t ino)
754 if (old_valid_dev(dev)) {
755 mk_fsid_v0(fsidv, dev, ino);
756 return exp_find_key(clp, 0, fsidv, NULL);
758 mk_fsid_v3(fsidv, dev, ino);
759 return exp_find_key(clp, 3, fsidv, NULL);
763 * Find the client's export entry matching fsid
765 static inline struct svc_expkey *
766 exp_get_fsid_key(svc_client *clp, int fsid)
770 mk_fsid_v1(fsidv, fsid);
772 return exp_find_key(clp, 1, fsidv, NULL);
776 exp_get_by_name(svc_client *clp, struct vfsmount *mnt, struct dentry *dentry,
777 struct cache_req *reqp)
779 struct svc_export *exp, key;
786 key.ex_dentry = dentry;
788 exp = svc_export_lookup(&key);
792 err = cache_check(&svc_export_cache, &exp->h, reqp);
808 * Find the export entry for a given dentry.
811 exp_parent(svc_client *clp, struct vfsmount *mnt, struct dentry *dentry,
812 struct cache_req *reqp)
817 exp = exp_get_by_name(clp, mnt, dentry, reqp);
819 while (exp == NULL && !IS_ROOT(dentry)) {
820 struct dentry *parent;
822 parent = dget_parent(dentry);
825 exp = exp_get_by_name(clp, mnt, dentry, reqp);
832 * Hashtable locking. Write locks are placed only by user processes
833 * wanting to modify export information.
834 * Write locking only done in this file. Read locking
838 static DECLARE_RWSEM(hash_sem);
843 down_read(&hash_sem);
849 down_write(&hash_sem);
859 exp_writeunlock(void)
864 static void exp_fsid_unhash(struct svc_export *exp)
866 struct svc_expkey *ek;
868 if ((exp->ex_flags & NFSEXP_FSID) == 0)
871 ek = exp_get_fsid_key(exp->ex_client, exp->ex_fsid);
872 if (ek && !IS_ERR(ek)) {
873 ek->h.expiry_time = get_seconds()-1;
874 cache_put(&ek->h, &svc_expkey_cache);
876 svc_expkey_cache.nextcheck = get_seconds();
879 static int exp_fsid_hash(svc_client *clp, struct svc_export *exp)
883 if ((exp->ex_flags & NFSEXP_FSID) == 0)
886 mk_fsid_v1(fsid, exp->ex_fsid);
887 return exp_set_key(clp, 1, fsid, exp);
890 static int exp_hash(struct auth_domain *clp, struct svc_export *exp)
893 struct inode *inode = exp->ex_dentry->d_inode;
894 dev_t dev = inode->i_sb->s_dev;
896 if (old_valid_dev(dev)) {
897 mk_fsid_v0(fsid, dev, inode->i_ino);
898 return exp_set_key(clp, 0, fsid, exp);
900 mk_fsid_v3(fsid, dev, inode->i_ino);
901 return exp_set_key(clp, 3, fsid, exp);
904 static void exp_unhash(struct svc_export *exp)
906 struct svc_expkey *ek;
907 struct inode *inode = exp->ex_dentry->d_inode;
909 ek = exp_get_key(exp->ex_client, inode->i_sb->s_dev, inode->i_ino);
910 if (ek && !IS_ERR(ek)) {
911 ek->h.expiry_time = get_seconds()-1;
912 cache_put(&ek->h, &svc_expkey_cache);
914 svc_expkey_cache.nextcheck = get_seconds();
918 * Export a file system.
921 exp_export(struct nfsctl_export *nxp)
924 struct svc_export *exp = NULL;
925 struct svc_export new;
926 struct svc_expkey *fsid_key = NULL;
930 /* Consistency check */
932 if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) ||
933 !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX))
936 dprintk("exp_export called for %s:%s (%x/%ld fl %x).\n",
937 nxp->ex_client, nxp->ex_path,
938 (unsigned)nxp->ex_dev, (long)nxp->ex_ino,
941 /* Try to lock the export table for update */
944 /* Look up client info */
945 if (!(clp = auth_domain_find(nxp->ex_client)))
949 /* Look up the dentry */
950 err = path_lookup(nxp->ex_path, 0, &nd);
955 exp = exp_get_by_name(clp, nd.mnt, nd.dentry, NULL);
957 memset(&new, 0, sizeof(new));
959 /* must make sure there won't be an ex_fsid clash */
960 if ((nxp->ex_flags & NFSEXP_FSID) &&
961 (fsid_key = exp_get_fsid_key(clp, nxp->ex_dev)) &&
964 (fsid_key->ek_mnt != nd.mnt || fsid_key->ek_dentry != nd.dentry) )
968 /* just a flags/id/fsid update */
970 exp_fsid_unhash(exp);
971 exp->ex_flags = nxp->ex_flags;
972 exp->ex_anon_uid = nxp->ex_anon_uid;
973 exp->ex_anon_gid = nxp->ex_anon_gid;
974 exp->ex_fsid = nxp->ex_dev;
976 err = exp_fsid_hash(clp, exp);
980 err = check_export(nd.dentry->d_inode, nxp->ex_flags);
981 if (err) goto finish;
985 dprintk("nfsd: creating export entry %p for client %p\n", exp, clp);
987 new.h.expiry_time = NEVER;
989 new.ex_path = kstrdup(nxp->ex_path, GFP_KERNEL);
994 new.ex_dentry = nd.dentry;
995 new.ex_flags = nxp->ex_flags;
996 new.ex_anon_uid = nxp->ex_anon_uid;
997 new.ex_anon_gid = nxp->ex_anon_gid;
998 new.ex_fsid = nxp->ex_dev;
1000 exp = svc_export_lookup(&new);
1002 exp = svc_export_update(&new, exp);
1007 if (exp_hash(clp, exp) ||
1008 exp_fsid_hash(clp, exp)) {
1009 /* failed to create at least one index */
1010 exp_do_unexport(exp);
1019 if (fsid_key && !IS_ERR(fsid_key))
1020 cache_put(&fsid_key->h, &svc_expkey_cache);
1022 auth_domain_put(clp);
1031 * Unexport a file system. The export entry has already
1032 * been removed from the client's list of exported fs's.
1035 exp_do_unexport(svc_export *unexp)
1037 unexp->h.expiry_time = get_seconds()-1;
1038 svc_export_cache.nextcheck = get_seconds();
1040 exp_fsid_unhash(unexp);
1048 exp_unexport(struct nfsctl_export *nxp)
1050 struct auth_domain *dom;
1052 struct nameidata nd;
1055 /* Consistency check */
1056 if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) ||
1057 !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX))
1063 dom = auth_domain_find(nxp->ex_client);
1065 dprintk("nfsd: unexport couldn't find %s\n", nxp->ex_client);
1069 err = path_lookup(nxp->ex_path, 0, &nd);
1074 exp = exp_get_by_name(dom, nd.mnt, nd.dentry, NULL);
1079 exp_do_unexport(exp);
1084 auth_domain_put(dom);
1092 * Obtain the root fh on behalf of a client.
1093 * This could be done in user space, but I feel that it adds some safety
1094 * since its harder to fool a kernel module than a user space program.
1097 exp_rootfh(svc_client *clp, char *path, struct knfsd_fh *f, int maxsize)
1099 struct svc_export *exp;
1100 struct nameidata nd;
1101 struct inode *inode;
1106 /* NB: we probably ought to check that it's NUL-terminated */
1107 if (path_lookup(path, 0, &nd)) {
1108 printk("nfsd: exp_rootfh path not found %s", path);
1111 inode = nd.dentry->d_inode;
1113 dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n",
1114 path, nd.dentry, clp->name,
1115 inode->i_sb->s_id, inode->i_ino);
1116 exp = exp_parent(clp, nd.mnt, nd.dentry, NULL);
1122 dprintk("nfsd: exp_rootfh export not found.\n");
1127 * fh must be initialized before calling fh_compose
1129 fh_init(&fh, maxsize);
1130 if (fh_compose(&fh, exp, nd.dentry, NULL))
1134 memcpy(f, &fh.fh_handle, sizeof(struct knfsd_fh));
1143 exp_find(struct auth_domain *clp, int fsid_type, u32 *fsidv,
1144 struct cache_req *reqp)
1146 struct svc_export *exp;
1147 struct svc_expkey *ek = exp_find_key(clp, fsid_type, fsidv, reqp);
1148 if (!ek || IS_ERR(ek))
1149 return ERR_PTR(PTR_ERR(ek));
1151 exp = exp_get_by_name(clp, ek->ek_mnt, ek->ek_dentry, reqp);
1152 cache_put(&ek->h, &svc_expkey_cache);
1154 if (!exp || IS_ERR(exp))
1155 return ERR_PTR(PTR_ERR(exp));
1161 * Called when we need the filehandle for the root of the pseudofs,
1162 * for a given NFSv4 client. The root is defined to be the
1163 * export point with fsid==0
1166 exp_pseudoroot(struct auth_domain *clp, struct svc_fh *fhp,
1167 struct cache_req *creq)
1169 struct svc_export *exp;
1173 mk_fsid_v1(fsidv, 0);
1175 exp = exp_find(clp, 1, fsidv, creq);
1177 return nfserrno(PTR_ERR(exp));
1180 rv = fh_compose(fhp, exp, exp->ex_dentry, NULL);
1187 static void *e_start(struct seq_file *m, loff_t *pos)
1188 __acquires(svc_export_cache.hash_lock)
1191 unsigned hash, export;
1192 struct cache_head *ch;
1195 read_lock(&svc_export_cache.hash_lock);
1197 return SEQ_START_TOKEN;
1199 export = n & ((1LL<<32) - 1);
1202 for (ch=export_table[hash]; ch; ch=ch->next)
1205 n &= ~((1LL<<32) - 1);
1209 } while(hash < EXPORT_HASHMAX && export_table[hash]==NULL);
1210 if (hash >= EXPORT_HASHMAX)
1213 return export_table[hash];
1216 static void *e_next(struct seq_file *m, void *p, loff_t *pos)
1218 struct cache_head *ch = p;
1219 int hash = (*pos >> 32);
1221 if (p == SEQ_START_TOKEN)
1223 else if (ch->next == NULL) {
1230 *pos &= ~((1LL<<32) - 1);
1231 while (hash < EXPORT_HASHMAX && export_table[hash] == NULL) {
1235 if (hash >= EXPORT_HASHMAX)
1238 return export_table[hash];
1241 static void e_stop(struct seq_file *m, void *p)
1242 __releases(svc_export_cache.hash_lock)
1244 read_unlock(&svc_export_cache.hash_lock);
1248 static struct flags {
1252 { NFSEXP_READONLY, {"ro", "rw"}},
1253 { NFSEXP_INSECURE_PORT, {"insecure", ""}},
1254 { NFSEXP_ROOTSQUASH, {"root_squash", "no_root_squash"}},
1255 { NFSEXP_ALLSQUASH, {"all_squash", ""}},
1256 { NFSEXP_ASYNC, {"async", "sync"}},
1257 { NFSEXP_GATHERED_WRITES, {"wdelay", "no_wdelay"}},
1258 { NFSEXP_NOHIDE, {"nohide", ""}},
1259 { NFSEXP_CROSSMOUNT, {"crossmnt", ""}},
1260 { NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}},
1261 { NFSEXP_NOAUTHNLM, {"insecure_locks", ""}},
1263 { NFSEXP_MSNFS, {"msnfs", ""}},
1268 static void exp_flags(struct seq_file *m, int flag, int fsid,
1269 uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fsloc)
1274 for (flg = expflags; flg->flag; flg++) {
1275 int state = (flg->flag & flag)?0:1;
1276 if (*flg->name[state])
1277 seq_printf(m, "%s%s", first++?",":"", flg->name[state]);
1279 if (flag & NFSEXP_FSID)
1280 seq_printf(m, "%sfsid=%d", first++?",":"", fsid);
1281 if (anonu != (uid_t)-2 && anonu != (0x10000-2))
1282 seq_printf(m, "%sanonuid=%d", first++?",":"", anonu);
1283 if (anong != (gid_t)-2 && anong != (0x10000-2))
1284 seq_printf(m, "%sanongid=%d", first++?",":"", anong);
1285 if (fsloc && fsloc->locations_count > 0) {
1286 char *loctype = (fsloc->migrated) ? "refer" : "replicas";
1289 seq_printf(m, "%s%s=", first++?",":"", loctype);
1290 seq_escape(m, fsloc->locations[0].path, ",;@ \t\n\\");
1292 seq_escape(m, fsloc->locations[0].hosts, ",;@ \t\n\\");
1293 for (i = 1; i < fsloc->locations_count; i++) {
1295 seq_escape(m, fsloc->locations[i].path, ",;@ \t\n\\");
1297 seq_escape(m, fsloc->locations[i].hosts, ",;@ \t\n\\");
1302 static int e_show(struct seq_file *m, void *p)
1304 struct cache_head *cp = p;
1305 struct svc_export *exp = container_of(cp, struct svc_export, h);
1307 if (p == SEQ_START_TOKEN) {
1308 seq_puts(m, "# Version 1.1\n");
1309 seq_puts(m, "# Path Client(Flags) # IPs\n");
1314 if (cache_check(&svc_export_cache, &exp->h, NULL))
1316 cache_put(&exp->h, &svc_export_cache);
1317 return svc_export_show(m, &svc_export_cache, cp);
1320 struct seq_operations nfs_exports_op = {
1328 * Add or modify a client.
1329 * Change requests may involve the list of host addresses. The list of
1330 * exports and possibly existing uid maps are left untouched.
1333 exp_addclient(struct nfsctl_client *ncp)
1335 struct auth_domain *dom;
1338 /* First, consistency check. */
1340 if (! exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX))
1342 if (ncp->cl_naddr > NFSCLNT_ADDRMAX)
1345 /* Lock the hashtable */
1348 dom = unix_domain_find(ncp->cl_ident);
1354 /* Insert client into hashtable. */
1355 for (i = 0; i < ncp->cl_naddr; i++)
1356 auth_unix_add_addr(ncp->cl_addrlist[i], dom);
1358 auth_unix_forget_old(dom);
1359 auth_domain_put(dom);
1370 * Delete a client given an identifier.
1373 exp_delclient(struct nfsctl_client *ncp)
1376 struct auth_domain *dom;
1379 if (!exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX))
1382 /* Lock the hashtable */
1385 dom = auth_domain_find(ncp->cl_ident);
1386 /* just make sure that no addresses work
1387 * and that it will expire soon
1390 err = auth_unix_forget_old(dom);
1391 auth_domain_put(dom);
1400 * Verify that string is non-empty and does not exceed max length.
1403 exp_verify_string(char *cp, int max)
1407 for (i = 0; i < max; i++)
1411 printk(KERN_NOTICE "nfsd: couldn't validate string %s\n", cp);
1416 * Initialize the exports module.
1419 nfsd_export_init(void)
1421 dprintk("nfsd: initializing export module.\n");
1423 cache_register(&svc_export_cache);
1424 cache_register(&svc_expkey_cache);
1429 * Flush exports table - called when last nfsd thread is killed
1432 nfsd_export_flush(void)
1435 cache_purge(&svc_expkey_cache);
1436 cache_purge(&svc_export_cache);
1441 * Shutdown the exports module.
1444 nfsd_export_shutdown(void)
1447 dprintk("nfsd: shutting down export module.\n");
1451 if (cache_unregister(&svc_expkey_cache))
1452 printk(KERN_ERR "nfsd: failed to unregister expkey cache\n");
1453 if (cache_unregister(&svc_export_cache))
1454 printk(KERN_ERR "nfsd: failed to unregister export cache\n");
1455 svcauth_unix_purge();
1458 dprintk("nfsd: export shutdown complete.\n");