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
38 #define NFSD_PARANOIA 1
40 typedef struct auth_domain svc_client;
41 typedef struct svc_export svc_export;
43 static void exp_do_unexport(svc_export *unexp);
44 static int exp_verify_string(char *cp, int max);
48 * One maps client+vfsmnt+dentry to export options - the export map
49 * The other maps client+filehandle-fragment to export options. - the expkey map
51 * The export options are actually stored in the first map, and the
52 * second map contains a reference to the entry in the first map.
55 #define EXPKEY_HASHBITS 8
56 #define EXPKEY_HASHMAX (1 << EXPKEY_HASHBITS)
57 #define EXPKEY_HASHMASK (EXPKEY_HASHMAX -1)
58 static struct cache_head *expkey_table[EXPKEY_HASHMAX];
60 static void expkey_put(struct kref *ref)
62 struct svc_expkey *key = container_of(ref, struct svc_expkey, h.ref);
64 if (test_bit(CACHE_VALID, &key->h.flags) &&
65 !test_bit(CACHE_NEGATIVE, &key->h.flags)) {
69 auth_domain_put(key->ek_client);
73 static void expkey_request(struct cache_detail *cd,
75 char **bpp, int *blen)
77 /* client fsidtype \xfsid */
78 struct svc_expkey *ek = container_of(h, struct svc_expkey, h);
81 qword_add(bpp, blen, ek->ek_client->name);
82 snprintf(type, 5, "%d", ek->ek_fsidtype);
83 qword_add(bpp, blen, type);
84 qword_addhex(bpp, blen, (char*)ek->ek_fsid, key_len(ek->ek_fsidtype));
88 static struct svc_expkey *svc_expkey_update(struct svc_expkey *new, struct svc_expkey *old);
89 static struct svc_expkey *svc_expkey_lookup(struct svc_expkey *);
90 static struct cache_detail svc_expkey_cache;
92 static int expkey_parse(struct cache_detail *cd, char *mesg, int mlen)
94 /* client fsidtype fsid [path] */
97 struct auth_domain *dom = NULL;
101 struct svc_expkey key;
102 struct svc_expkey *ek;
104 if (mesg[mlen-1] != '\n')
108 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
113 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
117 dom = auth_domain_find(buf);
120 dprintk("found domain %s\n", buf);
123 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
125 fsidtype = simple_strtoul(buf, &ep, 10);
128 dprintk("found fsidtype %d\n", fsidtype);
129 if (key_len(fsidtype)==0) /* invalid type */
131 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
133 dprintk("found fsid length %d\n", len);
134 if (len != key_len(fsidtype))
137 /* OK, we seem to have a valid key */
139 key.h.expiry_time = get_expiry(&mesg);
140 if (key.h.expiry_time == 0)
144 key.ek_fsidtype = fsidtype;
145 memcpy(key.ek_fsid, buf, len);
147 ek = svc_expkey_lookup(&key);
152 /* now we want a pathname, or empty meaning NEGATIVE */
154 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) < 0)
156 dprintk("Path seems to be <%s>\n", buf);
159 set_bit(CACHE_NEGATIVE, &key.h.flags);
160 ek = svc_expkey_update(&key, ek);
162 cache_put(&ek->h, &svc_expkey_cache);
166 err = path_lookup(buf, 0, &nd);
170 dprintk("Found the path %s\n", buf);
172 key.ek_dentry = nd.dentry;
174 ek = svc_expkey_update(&key, ek);
176 cache_put(&ek->h, &svc_expkey_cache);
184 auth_domain_put(dom);
189 static int expkey_show(struct seq_file *m,
190 struct cache_detail *cd,
191 struct cache_head *h)
193 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%08x", ek->ek_client->name,
201 ek->ek_fsidtype, ek->ek_fsid[0]);
202 if (ek->ek_fsidtype != 1)
203 seq_printf(m, "%08x", ek->ek_fsid[1]);
204 if (ek->ek_fsidtype == 2)
205 seq_printf(m, "%08x", ek->ek_fsid[2]);
206 if (test_bit(CACHE_VALID, &h->flags) &&
207 !test_bit(CACHE_NEGATIVE, &h->flags)) {
209 seq_path(m, ek->ek_mnt, ek->ek_dentry, "\\ \t\n");
215 static inline int expkey_match (struct cache_head *a, struct cache_head *b)
217 struct svc_expkey *orig = container_of(a, struct svc_expkey, h);
218 struct svc_expkey *new = container_of(b, struct svc_expkey, h);
220 if (orig->ek_fsidtype != new->ek_fsidtype ||
221 orig->ek_client != new->ek_client ||
222 memcmp(orig->ek_fsid, new->ek_fsid, key_len(orig->ek_fsidtype)) != 0)
227 static inline void expkey_init(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 kref_get(&item->ek_client->ref);
234 new->ek_client = item->ek_client;
235 new->ek_fsidtype = item->ek_fsidtype;
236 new->ek_fsid[0] = item->ek_fsid[0];
237 new->ek_fsid[1] = item->ek_fsid[1];
238 new->ek_fsid[2] = item->ek_fsid[2];
241 static inline void expkey_update(struct cache_head *cnew,
242 struct cache_head *citem)
244 struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
245 struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
247 new->ek_mnt = mntget(item->ek_mnt);
248 new->ek_dentry = dget(item->ek_dentry);
251 static struct cache_head *expkey_alloc(void)
253 struct svc_expkey *i = kmalloc(sizeof(*i), GFP_KERNEL);
260 static struct cache_detail svc_expkey_cache = {
261 .owner = THIS_MODULE,
262 .hash_size = EXPKEY_HASHMAX,
263 .hash_table = expkey_table,
265 .cache_put = expkey_put,
266 .cache_request = expkey_request,
267 .cache_parse = expkey_parse,
268 .cache_show = expkey_show,
269 .match = expkey_match,
271 .update = expkey_update,
272 .alloc = expkey_alloc,
275 static struct svc_expkey *
276 svc_expkey_lookup(struct svc_expkey *item)
278 struct cache_head *ch;
279 int hash = item->ek_fsidtype;
280 char * cp = (char*)item->ek_fsid;
281 int len = key_len(item->ek_fsidtype);
283 hash ^= hash_mem(cp, len, EXPKEY_HASHBITS);
284 hash ^= hash_ptr(item->ek_client, EXPKEY_HASHBITS);
285 hash &= EXPKEY_HASHMASK;
287 ch = sunrpc_cache_lookup(&svc_expkey_cache, &item->h,
290 return container_of(ch, struct svc_expkey, h);
295 static struct svc_expkey *
296 svc_expkey_update(struct svc_expkey *new, struct svc_expkey *old)
298 struct cache_head *ch;
299 int hash = new->ek_fsidtype;
300 char * cp = (char*)new->ek_fsid;
301 int len = key_len(new->ek_fsidtype);
303 hash ^= hash_mem(cp, len, EXPKEY_HASHBITS);
304 hash ^= hash_ptr(new->ek_client, EXPKEY_HASHBITS);
305 hash &= EXPKEY_HASHMASK;
307 ch = sunrpc_cache_update(&svc_expkey_cache, &new->h,
310 return container_of(ch, struct svc_expkey, h);
316 #define EXPORT_HASHBITS 8
317 #define EXPORT_HASHMAX (1<< EXPORT_HASHBITS)
318 #define EXPORT_HASHMASK (EXPORT_HASHMAX -1)
320 static struct cache_head *export_table[EXPORT_HASHMAX];
322 static void nfsd4_fslocs_free(struct nfsd4_fs_locations *fsloc)
326 for (i = 0; i < fsloc->locations_count; i++) {
327 kfree(fsloc->locations[i].path);
328 kfree(fsloc->locations[i].hosts);
330 kfree(fsloc->locations);
333 static void svc_export_put(struct kref *ref)
335 struct svc_export *exp = container_of(ref, struct svc_export, h.ref);
336 dput(exp->ex_dentry);
338 auth_domain_put(exp->ex_client);
340 nfsd4_fslocs_free(&exp->ex_fslocs);
344 static void svc_export_request(struct cache_detail *cd,
345 struct cache_head *h,
346 char **bpp, int *blen)
349 struct svc_export *exp = container_of(h, struct svc_export, h);
352 qword_add(bpp, blen, exp->ex_client->name);
353 pth = d_path(exp->ex_dentry, exp->ex_mnt, *bpp, *blen);
355 /* is this correct? */
359 qword_add(bpp, blen, pth);
363 static struct svc_export *svc_export_update(struct svc_export *new,
364 struct svc_export *old);
365 static struct svc_export *svc_export_lookup(struct svc_export *);
367 static int check_export(struct inode *inode, int flags)
370 /* We currently export only dirs and regular files.
371 * This is what umountd does.
373 if (!S_ISDIR(inode->i_mode) &&
374 !S_ISREG(inode->i_mode))
377 /* There are two requirements on a filesystem to be exportable.
378 * 1: We must be able to identify the filesystem from a number.
379 * either a device number (so FS_REQUIRES_DEV needed)
380 * or an FSID number (so NFSEXP_FSID needed).
381 * 2: We must be able to find an inode from a filehandle.
382 * This means that s_export_op must be set.
384 if (!(inode->i_sb->s_type->fs_flags & FS_REQUIRES_DEV) &&
385 !(flags & NFSEXP_FSID)) {
386 dprintk("exp_export: export of non-dev fs without fsid\n");
389 if (!inode->i_sb->s_export_op) {
390 dprintk("exp_export: export of invalid fs type.\n");
394 /* Ok, we can export it */;
395 if (!inode->i_sb->s_export_op->find_exported_dentry)
396 inode->i_sb->s_export_op->find_exported_dentry =
397 find_exported_dentry;
402 #ifdef CONFIG_NFSD_V4
405 fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc)
408 int migrated, i, err;
410 len = qword_get(mesg, buf, PAGE_SIZE);
411 if (len != 5 || memcmp(buf, "fsloc", 5))
415 err = get_int(mesg, &fsloc->locations_count);
418 if (fsloc->locations_count > MAX_FS_LOCATIONS)
420 if (fsloc->locations_count == 0)
423 fsloc->locations = kzalloc(fsloc->locations_count
424 * sizeof(struct nfsd4_fs_location), GFP_KERNEL);
425 if (!fsloc->locations)
427 for (i=0; i < fsloc->locations_count; i++) {
428 /* colon separated host list */
430 len = qword_get(mesg, buf, PAGE_SIZE);
434 fsloc->locations[i].hosts = kstrdup(buf, GFP_KERNEL);
435 if (!fsloc->locations[i].hosts)
438 /* slash separated path component list */
439 len = qword_get(mesg, buf, PAGE_SIZE);
443 fsloc->locations[i].path = kstrdup(buf, GFP_KERNEL);
444 if (!fsloc->locations[i].path)
448 err = get_int(mesg, &migrated);
452 if (migrated < 0 || migrated > 1)
454 fsloc->migrated = migrated;
457 nfsd4_fslocs_free(fsloc);
461 #else /* CONFIG_NFSD_V4 */
462 static inline int fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc) { return 0; }
465 static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen)
467 /* client path expiry [flags anonuid anongid fsid] */
471 struct auth_domain *dom = NULL;
473 struct svc_export exp, *expp;
479 if (mesg[mlen-1] != '\n')
483 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
488 len = qword_get(&mesg, buf, PAGE_SIZE);
490 if (len <= 0) goto out;
493 dom = auth_domain_find(buf);
499 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
501 err = path_lookup(buf, 0, &nd);
502 if (err) goto out_no_path;
507 exp.ex_dentry = nd.dentry;
508 exp.ex_path = kstrdup(buf, GFP_KERNEL);
515 exp.h.expiry_time = get_expiry(&mesg);
516 if (exp.h.expiry_time == 0)
520 exp.ex_fslocs.locations = NULL;
521 exp.ex_fslocs.locations_count = 0;
522 exp.ex_fslocs.migrated = 0;
525 err = get_int(&mesg, &an_int);
527 set_bit(CACHE_NEGATIVE, &exp.h.flags);
529 if (err || an_int < 0) goto out;
530 exp.ex_flags= an_int;
533 err = get_int(&mesg, &an_int);
535 exp.ex_anon_uid= an_int;
538 err = get_int(&mesg, &an_int);
540 exp.ex_anon_gid= an_int;
543 err = get_int(&mesg, &an_int);
545 exp.ex_fsid = an_int;
547 err = check_export(nd.dentry->d_inode, exp.ex_flags);
550 err = fsloc_parse(&mesg, buf, &exp.ex_fslocs);
555 expp = svc_export_lookup(&exp);
557 expp = svc_export_update(&exp, expp);
571 auth_domain_put(dom);
576 static void exp_flags(struct seq_file *m, int flag, int fsid,
577 uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fslocs);
579 static int svc_export_show(struct seq_file *m,
580 struct cache_detail *cd,
581 struct cache_head *h)
583 struct svc_export *exp ;
586 seq_puts(m, "#path domain(flags)\n");
589 exp = container_of(h, struct svc_export, h);
590 seq_path(m, exp->ex_mnt, exp->ex_dentry, " \t\n\\");
592 seq_escape(m, exp->ex_client->name, " \t\n\\");
594 if (test_bit(CACHE_VALID, &h->flags) &&
595 !test_bit(CACHE_NEGATIVE, &h->flags))
596 exp_flags(m, exp->ex_flags, exp->ex_fsid,
597 exp->ex_anon_uid, exp->ex_anon_gid, &exp->ex_fslocs);
601 static int svc_export_match(struct cache_head *a, struct cache_head *b)
603 struct svc_export *orig = container_of(a, struct svc_export, h);
604 struct svc_export *new = container_of(b, struct svc_export, h);
605 return orig->ex_client == new->ex_client &&
606 orig->ex_dentry == new->ex_dentry &&
607 orig->ex_mnt == new->ex_mnt;
610 static void svc_export_init(struct cache_head *cnew, struct cache_head *citem)
612 struct svc_export *new = container_of(cnew, struct svc_export, h);
613 struct svc_export *item = container_of(citem, struct svc_export, h);
615 kref_get(&item->ex_client->ref);
616 new->ex_client = item->ex_client;
617 new->ex_dentry = dget(item->ex_dentry);
618 new->ex_mnt = mntget(item->ex_mnt);
620 new->ex_fslocs.locations = NULL;
621 new->ex_fslocs.locations_count = 0;
622 new->ex_fslocs.migrated = 0;
625 static void export_update(struct cache_head *cnew, struct cache_head *citem)
627 struct svc_export *new = container_of(cnew, struct svc_export, h);
628 struct svc_export *item = container_of(citem, struct svc_export, h);
630 new->ex_flags = item->ex_flags;
631 new->ex_anon_uid = item->ex_anon_uid;
632 new->ex_anon_gid = item->ex_anon_gid;
633 new->ex_fsid = item->ex_fsid;
634 new->ex_path = item->ex_path;
635 item->ex_path = NULL;
636 new->ex_fslocs.locations = item->ex_fslocs.locations;
637 item->ex_fslocs.locations = NULL;
638 new->ex_fslocs.locations_count = item->ex_fslocs.locations_count;
639 item->ex_fslocs.locations_count = 0;
640 new->ex_fslocs.migrated = item->ex_fslocs.migrated;
641 item->ex_fslocs.migrated = 0;
644 static struct cache_head *svc_export_alloc(void)
646 struct svc_export *i = kmalloc(sizeof(*i), GFP_KERNEL);
653 struct cache_detail svc_export_cache = {
654 .owner = THIS_MODULE,
655 .hash_size = EXPORT_HASHMAX,
656 .hash_table = export_table,
657 .name = "nfsd.export",
658 .cache_put = svc_export_put,
659 .cache_request = svc_export_request,
660 .cache_parse = svc_export_parse,
661 .cache_show = svc_export_show,
662 .match = svc_export_match,
663 .init = svc_export_init,
664 .update = export_update,
665 .alloc = svc_export_alloc,
668 static struct svc_export *
669 svc_export_lookup(struct svc_export *exp)
671 struct cache_head *ch;
673 hash = hash_ptr(exp->ex_client, EXPORT_HASHBITS);
674 hash ^= hash_ptr(exp->ex_dentry, EXPORT_HASHBITS);
675 hash ^= hash_ptr(exp->ex_mnt, EXPORT_HASHBITS);
677 ch = sunrpc_cache_lookup(&svc_export_cache, &exp->h,
680 return container_of(ch, struct svc_export, h);
685 static struct svc_export *
686 svc_export_update(struct svc_export *new, struct svc_export *old)
688 struct cache_head *ch;
690 hash = hash_ptr(old->ex_client, EXPORT_HASHBITS);
691 hash ^= hash_ptr(old->ex_dentry, EXPORT_HASHBITS);
692 hash ^= hash_ptr(old->ex_mnt, EXPORT_HASHBITS);
694 ch = sunrpc_cache_update(&svc_export_cache, &new->h,
698 return container_of(ch, struct svc_export, h);
704 static struct svc_expkey *
705 exp_find_key(svc_client *clp, int fsid_type, u32 *fsidv, struct cache_req *reqp)
707 struct svc_expkey key, *ek;
714 key.ek_fsidtype = fsid_type;
715 memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
717 ek = svc_expkey_lookup(&key);
719 if ((err = cache_check(&svc_expkey_cache, &ek->h, reqp)))
724 static int exp_set_key(svc_client *clp, int fsid_type, u32 *fsidv,
725 struct svc_export *exp)
727 struct svc_expkey key, *ek;
730 key.ek_fsidtype = fsid_type;
731 memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
732 key.ek_mnt = exp->ex_mnt;
733 key.ek_dentry = exp->ex_dentry;
734 key.h.expiry_time = NEVER;
737 ek = svc_expkey_lookup(&key);
739 ek = svc_expkey_update(&key,ek);
741 cache_put(&ek->h, &svc_expkey_cache);
748 * Find the client's export entry matching xdev/xino.
750 static inline struct svc_expkey *
751 exp_get_key(svc_client *clp, dev_t dev, ino_t ino)
755 if (old_valid_dev(dev)) {
756 mk_fsid_v0(fsidv, dev, ino);
757 return exp_find_key(clp, 0, fsidv, NULL);
759 mk_fsid_v3(fsidv, dev, ino);
760 return exp_find_key(clp, 3, fsidv, NULL);
764 * Find the client's export entry matching fsid
766 static inline struct svc_expkey *
767 exp_get_fsid_key(svc_client *clp, int fsid)
771 mk_fsid_v1(fsidv, fsid);
773 return exp_find_key(clp, 1, fsidv, NULL);
777 exp_get_by_name(svc_client *clp, struct vfsmount *mnt, struct dentry *dentry,
778 struct cache_req *reqp)
780 struct svc_export *exp, key;
787 key.ex_dentry = dentry;
789 exp = svc_export_lookup(&key);
793 err = cache_check(&svc_export_cache, &exp->h, reqp);
809 * Find the export entry for a given dentry.
812 exp_parent(svc_client *clp, struct vfsmount *mnt, struct dentry *dentry,
813 struct cache_req *reqp)
818 exp = exp_get_by_name(clp, mnt, dentry, reqp);
820 while (exp == NULL && !IS_ROOT(dentry)) {
821 struct dentry *parent;
823 parent = dget_parent(dentry);
826 exp = exp_get_by_name(clp, mnt, dentry, reqp);
833 * Hashtable locking. Write locks are placed only by user processes
834 * wanting to modify export information.
835 * Write locking only done in this file. Read locking
839 static DECLARE_RWSEM(hash_sem);
844 down_read(&hash_sem);
850 down_write(&hash_sem);
860 exp_writeunlock(void)
865 static void exp_fsid_unhash(struct svc_export *exp)
867 struct svc_expkey *ek;
869 if ((exp->ex_flags & NFSEXP_FSID) == 0)
872 ek = exp_get_fsid_key(exp->ex_client, exp->ex_fsid);
873 if (ek && !IS_ERR(ek)) {
874 ek->h.expiry_time = get_seconds()-1;
875 cache_put(&ek->h, &svc_expkey_cache);
877 svc_expkey_cache.nextcheck = get_seconds();
880 static int exp_fsid_hash(svc_client *clp, struct svc_export *exp)
884 if ((exp->ex_flags & NFSEXP_FSID) == 0)
887 mk_fsid_v1(fsid, exp->ex_fsid);
888 return exp_set_key(clp, 1, fsid, exp);
891 static int exp_hash(struct auth_domain *clp, struct svc_export *exp)
894 struct inode *inode = exp->ex_dentry->d_inode;
895 dev_t dev = inode->i_sb->s_dev;
897 if (old_valid_dev(dev)) {
898 mk_fsid_v0(fsid, dev, inode->i_ino);
899 return exp_set_key(clp, 0, fsid, exp);
901 mk_fsid_v3(fsid, dev, inode->i_ino);
902 return exp_set_key(clp, 3, fsid, exp);
905 static void exp_unhash(struct svc_export *exp)
907 struct svc_expkey *ek;
908 struct inode *inode = exp->ex_dentry->d_inode;
910 ek = exp_get_key(exp->ex_client, inode->i_sb->s_dev, inode->i_ino);
911 if (ek && !IS_ERR(ek)) {
912 ek->h.expiry_time = get_seconds()-1;
913 cache_put(&ek->h, &svc_expkey_cache);
915 svc_expkey_cache.nextcheck = get_seconds();
919 * Export a file system.
922 exp_export(struct nfsctl_export *nxp)
925 struct svc_export *exp = NULL;
926 struct svc_export new;
927 struct svc_expkey *fsid_key = NULL;
931 /* Consistency check */
933 if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) ||
934 !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX))
937 dprintk("exp_export called for %s:%s (%x/%ld fl %x).\n",
938 nxp->ex_client, nxp->ex_path,
939 (unsigned)nxp->ex_dev, (long)nxp->ex_ino,
942 /* Try to lock the export table for update */
945 /* Look up client info */
946 if (!(clp = auth_domain_find(nxp->ex_client)))
950 /* Look up the dentry */
951 err = path_lookup(nxp->ex_path, 0, &nd);
956 exp = exp_get_by_name(clp, nd.mnt, nd.dentry, NULL);
958 memset(&new, 0, sizeof(new));
960 /* must make sure there won't be an ex_fsid clash */
961 if ((nxp->ex_flags & NFSEXP_FSID) &&
962 (fsid_key = exp_get_fsid_key(clp, nxp->ex_dev)) &&
965 (fsid_key->ek_mnt != nd.mnt || fsid_key->ek_dentry != nd.dentry) )
969 /* just a flags/id/fsid update */
971 exp_fsid_unhash(exp);
972 exp->ex_flags = nxp->ex_flags;
973 exp->ex_anon_uid = nxp->ex_anon_uid;
974 exp->ex_anon_gid = nxp->ex_anon_gid;
975 exp->ex_fsid = nxp->ex_dev;
977 err = exp_fsid_hash(clp, exp);
981 err = check_export(nd.dentry->d_inode, nxp->ex_flags);
982 if (err) goto finish;
986 dprintk("nfsd: creating export entry %p for client %p\n", exp, clp);
988 new.h.expiry_time = NEVER;
990 new.ex_path = kstrdup(nxp->ex_path, GFP_KERNEL);
995 new.ex_dentry = nd.dentry;
996 new.ex_flags = nxp->ex_flags;
997 new.ex_anon_uid = nxp->ex_anon_uid;
998 new.ex_anon_gid = nxp->ex_anon_gid;
999 new.ex_fsid = nxp->ex_dev;
1001 exp = svc_export_lookup(&new);
1003 exp = svc_export_update(&new, exp);
1008 if (exp_hash(clp, exp) ||
1009 exp_fsid_hash(clp, exp)) {
1010 /* failed to create at least one index */
1011 exp_do_unexport(exp);
1020 if (fsid_key && !IS_ERR(fsid_key))
1021 cache_put(&fsid_key->h, &svc_expkey_cache);
1023 auth_domain_put(clp);
1032 * Unexport a file system. The export entry has already
1033 * been removed from the client's list of exported fs's.
1036 exp_do_unexport(svc_export *unexp)
1038 unexp->h.expiry_time = get_seconds()-1;
1039 svc_export_cache.nextcheck = get_seconds();
1041 exp_fsid_unhash(unexp);
1049 exp_unexport(struct nfsctl_export *nxp)
1051 struct auth_domain *dom;
1053 struct nameidata nd;
1056 /* Consistency check */
1057 if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) ||
1058 !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX))
1064 dom = auth_domain_find(nxp->ex_client);
1066 dprintk("nfsd: unexport couldn't find %s\n", nxp->ex_client);
1070 err = path_lookup(nxp->ex_path, 0, &nd);
1075 exp = exp_get_by_name(dom, nd.mnt, nd.dentry, NULL);
1080 exp_do_unexport(exp);
1085 auth_domain_put(dom);
1093 * Obtain the root fh on behalf of a client.
1094 * This could be done in user space, but I feel that it adds some safety
1095 * since its harder to fool a kernel module than a user space program.
1098 exp_rootfh(svc_client *clp, char *path, struct knfsd_fh *f, int maxsize)
1100 struct svc_export *exp;
1101 struct nameidata nd;
1102 struct inode *inode;
1107 /* NB: we probably ought to check that it's NUL-terminated */
1108 if (path_lookup(path, 0, &nd)) {
1109 printk("nfsd: exp_rootfh path not found %s", path);
1112 inode = nd.dentry->d_inode;
1114 dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n",
1115 path, nd.dentry, clp->name,
1116 inode->i_sb->s_id, inode->i_ino);
1117 exp = exp_parent(clp, nd.mnt, nd.dentry, NULL);
1123 dprintk("nfsd: exp_rootfh export not found.\n");
1128 * fh must be initialized before calling fh_compose
1130 fh_init(&fh, maxsize);
1131 if (fh_compose(&fh, exp, nd.dentry, NULL))
1135 memcpy(f, &fh.fh_handle, sizeof(struct knfsd_fh));
1144 exp_find(struct auth_domain *clp, int fsid_type, u32 *fsidv,
1145 struct cache_req *reqp)
1147 struct svc_export *exp;
1148 struct svc_expkey *ek = exp_find_key(clp, fsid_type, fsidv, reqp);
1149 if (!ek || IS_ERR(ek))
1150 return ERR_PTR(PTR_ERR(ek));
1152 exp = exp_get_by_name(clp, ek->ek_mnt, ek->ek_dentry, reqp);
1153 cache_put(&ek->h, &svc_expkey_cache);
1155 if (!exp || IS_ERR(exp))
1156 return ERR_PTR(PTR_ERR(exp));
1162 * Called when we need the filehandle for the root of the pseudofs,
1163 * for a given NFSv4 client. The root is defined to be the
1164 * export point with fsid==0
1167 exp_pseudoroot(struct auth_domain *clp, struct svc_fh *fhp,
1168 struct cache_req *creq)
1170 struct svc_export *exp;
1174 mk_fsid_v1(fsidv, 0);
1176 exp = exp_find(clp, 1, fsidv, creq);
1178 return nfserrno(PTR_ERR(exp));
1181 rv = fh_compose(fhp, exp, exp->ex_dentry, NULL);
1188 static void *e_start(struct seq_file *m, loff_t *pos)
1189 __acquires(svc_export_cache.hash_lock)
1192 unsigned hash, export;
1193 struct cache_head *ch;
1196 read_lock(&svc_export_cache.hash_lock);
1198 return SEQ_START_TOKEN;
1200 export = n & ((1LL<<32) - 1);
1203 for (ch=export_table[hash]; ch; ch=ch->next)
1206 n &= ~((1LL<<32) - 1);
1210 } while(hash < EXPORT_HASHMAX && export_table[hash]==NULL);
1211 if (hash >= EXPORT_HASHMAX)
1214 return export_table[hash];
1217 static void *e_next(struct seq_file *m, void *p, loff_t *pos)
1219 struct cache_head *ch = p;
1220 int hash = (*pos >> 32);
1222 if (p == SEQ_START_TOKEN)
1224 else if (ch->next == NULL) {
1231 *pos &= ~((1LL<<32) - 1);
1232 while (hash < EXPORT_HASHMAX && export_table[hash] == NULL) {
1236 if (hash >= EXPORT_HASHMAX)
1239 return export_table[hash];
1242 static void e_stop(struct seq_file *m, void *p)
1243 __releases(svc_export_cache.hash_lock)
1245 read_unlock(&svc_export_cache.hash_lock);
1249 static struct flags {
1253 { NFSEXP_READONLY, {"ro", "rw"}},
1254 { NFSEXP_INSECURE_PORT, {"insecure", ""}},
1255 { NFSEXP_ROOTSQUASH, {"root_squash", "no_root_squash"}},
1256 { NFSEXP_ALLSQUASH, {"all_squash", ""}},
1257 { NFSEXP_ASYNC, {"async", "sync"}},
1258 { NFSEXP_GATHERED_WRITES, {"wdelay", "no_wdelay"}},
1259 { NFSEXP_NOHIDE, {"nohide", ""}},
1260 { NFSEXP_CROSSMOUNT, {"crossmnt", ""}},
1261 { NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}},
1262 { NFSEXP_NOAUTHNLM, {"insecure_locks", ""}},
1264 { NFSEXP_MSNFS, {"msnfs", ""}},
1269 static void exp_flags(struct seq_file *m, int flag, int fsid,
1270 uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fsloc)
1275 for (flg = expflags; flg->flag; flg++) {
1276 int state = (flg->flag & flag)?0:1;
1277 if (*flg->name[state])
1278 seq_printf(m, "%s%s", first++?",":"", flg->name[state]);
1280 if (flag & NFSEXP_FSID)
1281 seq_printf(m, "%sfsid=%d", first++?",":"", fsid);
1282 if (anonu != (uid_t)-2 && anonu != (0x10000-2))
1283 seq_printf(m, "%sanonuid=%d", first++?",":"", anonu);
1284 if (anong != (gid_t)-2 && anong != (0x10000-2))
1285 seq_printf(m, "%sanongid=%d", first++?",":"", anong);
1286 if (fsloc && fsloc->locations_count > 0) {
1287 char *loctype = (fsloc->migrated) ? "refer" : "replicas";
1290 seq_printf(m, "%s%s=", first++?",":"", loctype);
1291 seq_escape(m, fsloc->locations[0].path, ",;@ \t\n\\");
1293 seq_escape(m, fsloc->locations[0].hosts, ",;@ \t\n\\");
1294 for (i = 1; i < fsloc->locations_count; i++) {
1296 seq_escape(m, fsloc->locations[i].path, ",;@ \t\n\\");
1298 seq_escape(m, fsloc->locations[i].hosts, ",;@ \t\n\\");
1303 static int e_show(struct seq_file *m, void *p)
1305 struct cache_head *cp = p;
1306 struct svc_export *exp = container_of(cp, struct svc_export, h);
1308 if (p == SEQ_START_TOKEN) {
1309 seq_puts(m, "# Version 1.1\n");
1310 seq_puts(m, "# Path Client(Flags) # IPs\n");
1315 if (cache_check(&svc_export_cache, &exp->h, NULL))
1317 cache_put(&exp->h, &svc_export_cache);
1318 return svc_export_show(m, &svc_export_cache, cp);
1321 struct seq_operations nfs_exports_op = {
1329 * Add or modify a client.
1330 * Change requests may involve the list of host addresses. The list of
1331 * exports and possibly existing uid maps are left untouched.
1334 exp_addclient(struct nfsctl_client *ncp)
1336 struct auth_domain *dom;
1339 /* First, consistency check. */
1341 if (! exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX))
1343 if (ncp->cl_naddr > NFSCLNT_ADDRMAX)
1346 /* Lock the hashtable */
1349 dom = unix_domain_find(ncp->cl_ident);
1355 /* Insert client into hashtable. */
1356 for (i = 0; i < ncp->cl_naddr; i++)
1357 auth_unix_add_addr(ncp->cl_addrlist[i], dom);
1359 auth_unix_forget_old(dom);
1360 auth_domain_put(dom);
1371 * Delete a client given an identifier.
1374 exp_delclient(struct nfsctl_client *ncp)
1377 struct auth_domain *dom;
1380 if (!exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX))
1383 /* Lock the hashtable */
1386 dom = auth_domain_find(ncp->cl_ident);
1387 /* just make sure that no addresses work
1388 * and that it will expire soon
1391 err = auth_unix_forget_old(dom);
1392 auth_domain_put(dom);
1401 * Verify that string is non-empty and does not exceed max length.
1404 exp_verify_string(char *cp, int max)
1408 for (i = 0; i < max; i++)
1412 printk(KERN_NOTICE "nfsd: couldn't validate string %s\n", cp);
1417 * Initialize the exports module.
1420 nfsd_export_init(void)
1422 dprintk("nfsd: initializing export module.\n");
1424 cache_register(&svc_export_cache);
1425 cache_register(&svc_expkey_cache);
1430 * Flush exports table - called when last nfsd thread is killed
1433 nfsd_export_flush(void)
1436 cache_purge(&svc_expkey_cache);
1437 cache_purge(&svc_export_cache);
1442 * Shutdown the exports module.
1445 nfsd_export_shutdown(void)
1448 dprintk("nfsd: shutting down export module.\n");
1452 if (cache_unregister(&svc_expkey_cache))
1453 printk(KERN_ERR "nfsd: failed to unregister expkey cache\n");
1454 if (cache_unregister(&svc_export_cache))
1455 printk(KERN_ERR "nfsd: failed to unregister export cache\n");
1456 svcauth_unix_purge();
1459 dprintk("nfsd: export shutdown complete.\n");