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 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 int expkey_parse(struct cache_detail *cd, char *mesg, int mlen)
92 /* client fsidtype fsid [path] */
95 struct auth_domain *dom = NULL;
99 struct svc_expkey key;
100 struct svc_expkey *ek;
102 if (mesg[mlen-1] != '\n')
106 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
111 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
115 dom = auth_domain_find(buf);
118 dprintk("found domain %s\n", buf);
121 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
123 fsidtype = simple_strtoul(buf, &ep, 10);
126 dprintk("found fsidtype %d\n", fsidtype);
129 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
131 dprintk("found fsid length %d\n", len);
132 if (len != key_len(fsidtype))
135 /* OK, we seem to have a valid key */
137 key.h.expiry_time = get_expiry(&mesg);
138 if (key.h.expiry_time == 0)
142 key.ek_fsidtype = fsidtype;
143 memcpy(key.ek_fsid, buf, len);
145 ek = svc_expkey_lookup(&key);
150 /* now we want a pathname, or empty meaning NEGATIVE */
152 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) < 0)
154 dprintk("Path seems to be <%s>\n", buf);
157 set_bit(CACHE_NEGATIVE, &key.h.flags);
158 ek = svc_expkey_update(&key, ek);
160 cache_put(&ek->h, &svc_expkey_cache);
164 err = path_lookup(buf, 0, &nd);
168 dprintk("Found the path %s\n", buf);
170 key.ek_dentry = nd.dentry;
172 ek = svc_expkey_update(&key, ek);
174 cache_put(&ek->h, &svc_expkey_cache);
182 auth_domain_put(dom);
187 static int expkey_show(struct seq_file *m,
188 struct cache_detail *cd,
189 struct cache_head *h)
191 struct svc_expkey *ek ;
194 seq_puts(m, "#domain fsidtype fsid [path]\n");
197 ek = container_of(h, struct svc_expkey, h);
198 seq_printf(m, "%s %d 0x%08x", ek->ek_client->name,
199 ek->ek_fsidtype, ek->ek_fsid[0]);
200 if (ek->ek_fsidtype != 1)
201 seq_printf(m, "%08x", ek->ek_fsid[1]);
202 if (ek->ek_fsidtype == 2)
203 seq_printf(m, "%08x", ek->ek_fsid[2]);
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;
234 new->ek_fsid[0] = item->ek_fsid[0];
235 new->ek_fsid[1] = item->ek_fsid[1];
236 new->ek_fsid[2] = item->ek_fsid[2];
239 static inline void expkey_update(struct cache_head *cnew,
240 struct cache_head *citem)
242 struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
243 struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
245 new->ek_mnt = mntget(item->ek_mnt);
246 new->ek_dentry = dget(item->ek_dentry);
249 static struct cache_head *expkey_alloc(void)
251 struct svc_expkey *i = kmalloc(sizeof(*i), GFP_KERNEL);
258 struct cache_detail svc_expkey_cache = {
259 .owner = THIS_MODULE,
260 .hash_size = EXPKEY_HASHMAX,
261 .hash_table = expkey_table,
263 .cache_put = expkey_put,
264 .cache_request = expkey_request,
265 .cache_parse = expkey_parse,
266 .cache_show = expkey_show,
267 .match = expkey_match,
269 .update = expkey_update,
270 .alloc = expkey_alloc,
273 static struct svc_expkey *
274 svc_expkey_lookup(struct svc_expkey *item)
276 struct cache_head *ch;
277 int hash = item->ek_fsidtype;
278 char * cp = (char*)item->ek_fsid;
279 int len = key_len(item->ek_fsidtype);
281 hash ^= hash_mem(cp, len, EXPKEY_HASHBITS);
282 hash ^= hash_ptr(item->ek_client, EXPKEY_HASHBITS);
283 hash &= EXPKEY_HASHMASK;
285 ch = sunrpc_cache_lookup(&svc_expkey_cache, &item->h,
288 return container_of(ch, struct svc_expkey, h);
293 static struct svc_expkey *
294 svc_expkey_update(struct svc_expkey *new, struct svc_expkey *old)
296 struct cache_head *ch;
297 int hash = new->ek_fsidtype;
298 char * cp = (char*)new->ek_fsid;
299 int len = key_len(new->ek_fsidtype);
301 hash ^= hash_mem(cp, len, EXPKEY_HASHBITS);
302 hash ^= hash_ptr(new->ek_client, EXPKEY_HASHBITS);
303 hash &= EXPKEY_HASHMASK;
305 ch = sunrpc_cache_update(&svc_expkey_cache, &new->h,
308 return container_of(ch, struct svc_expkey, h);
314 #define EXPORT_HASHBITS 8
315 #define EXPORT_HASHMAX (1<< EXPORT_HASHBITS)
316 #define EXPORT_HASHMASK (EXPORT_HASHMAX -1)
318 static struct cache_head *export_table[EXPORT_HASHMAX];
320 static void svc_export_put(struct kref *ref)
322 struct svc_export *exp = container_of(ref, struct svc_export, h.ref);
323 dput(exp->ex_dentry);
325 auth_domain_put(exp->ex_client);
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_dentry, exp->ex_mnt, *bpp, *blen);
340 /* is this correct? */
344 qword_add(bpp, blen, pth);
348 struct svc_export *svc_export_update(struct svc_export *new, struct svc_export *old);
349 static struct svc_export *svc_export_lookup(struct svc_export *);
351 static int check_export(struct inode *inode, int flags)
354 /* We currently export only dirs and regular files.
355 * This is what umountd does.
357 if (!S_ISDIR(inode->i_mode) &&
358 !S_ISREG(inode->i_mode))
361 /* There are two requirements on a filesystem to be exportable.
362 * 1: We must be able to identify the filesystem from a number.
363 * either a device number (so FS_REQUIRES_DEV needed)
364 * or an FSID number (so NFSEXP_FSID needed).
365 * 2: We must be able to find an inode from a filehandle.
366 * This means that s_export_op must be set.
368 if (!(inode->i_sb->s_type->fs_flags & FS_REQUIRES_DEV) &&
369 !(flags & NFSEXP_FSID)) {
370 dprintk("exp_export: export of non-dev fs without fsid");
373 if (!inode->i_sb->s_export_op) {
374 dprintk("exp_export: export of invalid fs type.\n");
378 /* Ok, we can export it */;
379 if (!inode->i_sb->s_export_op->find_exported_dentry)
380 inode->i_sb->s_export_op->find_exported_dentry =
381 find_exported_dentry;
386 static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen)
388 /* client path expiry [flags anonuid anongid fsid] */
392 struct auth_domain *dom = NULL;
394 struct svc_export exp, *expp;
399 if (mesg[mlen-1] != '\n')
403 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
408 len = qword_get(&mesg, buf, PAGE_SIZE);
410 if (len <= 0) goto out;
413 dom = auth_domain_find(buf);
419 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
421 err = path_lookup(buf, 0, &nd);
427 exp.ex_dentry = nd.dentry;
431 exp.h.expiry_time = get_expiry(&mesg);
432 if (exp.h.expiry_time == 0)
436 err = get_int(&mesg, &an_int);
438 set_bit(CACHE_NEGATIVE, &exp.h.flags);
440 if (err || an_int < 0) goto out;
441 exp.ex_flags= an_int;
444 err = get_int(&mesg, &an_int);
446 exp.ex_anon_uid= an_int;
449 err = get_int(&mesg, &an_int);
451 exp.ex_anon_gid= an_int;
454 err = get_int(&mesg, &an_int);
456 exp.ex_fsid = an_int;
458 err = check_export(nd.dentry->d_inode, exp.ex_flags);
462 expp = svc_export_lookup(&exp);
464 expp = svc_export_update(&exp, expp);
476 auth_domain_put(dom);
481 static void exp_flags(struct seq_file *m, int flag, int fsid, uid_t anonu, uid_t anong);
483 static int svc_export_show(struct seq_file *m,
484 struct cache_detail *cd,
485 struct cache_head *h)
487 struct svc_export *exp ;
490 seq_puts(m, "#path domain(flags)\n");
493 exp = container_of(h, struct svc_export, h);
494 seq_path(m, exp->ex_mnt, exp->ex_dentry, " \t\n\\");
496 seq_escape(m, exp->ex_client->name, " \t\n\\");
498 if (test_bit(CACHE_VALID, &h->flags) &&
499 !test_bit(CACHE_NEGATIVE, &h->flags))
500 exp_flags(m, exp->ex_flags, exp->ex_fsid,
501 exp->ex_anon_uid, exp->ex_anon_gid);
505 static int svc_export_match(struct cache_head *a, struct cache_head *b)
507 struct svc_export *orig = container_of(a, struct svc_export, h);
508 struct svc_export *new = container_of(b, struct svc_export, h);
509 return orig->ex_client == new->ex_client &&
510 orig->ex_dentry == new->ex_dentry &&
511 orig->ex_mnt == new->ex_mnt;
514 static void svc_export_init(struct cache_head *cnew, struct cache_head *citem)
516 struct svc_export *new = container_of(cnew, struct svc_export, h);
517 struct svc_export *item = container_of(citem, struct svc_export, h);
519 kref_get(&item->ex_client->ref);
520 new->ex_client = item->ex_client;
521 new->ex_dentry = dget(item->ex_dentry);
522 new->ex_mnt = mntget(item->ex_mnt);
525 static void export_update(struct cache_head *cnew, struct cache_head *citem)
527 struct svc_export *new = container_of(cnew, struct svc_export, h);
528 struct svc_export *item = container_of(citem, struct svc_export, h);
530 new->ex_flags = item->ex_flags;
531 new->ex_anon_uid = item->ex_anon_uid;
532 new->ex_anon_gid = item->ex_anon_gid;
533 new->ex_fsid = item->ex_fsid;
536 static struct cache_head *svc_export_alloc(void)
538 struct svc_export *i = kmalloc(sizeof(*i), GFP_KERNEL);
545 struct cache_detail svc_export_cache = {
546 .owner = THIS_MODULE,
547 .hash_size = EXPORT_HASHMAX,
548 .hash_table = export_table,
549 .name = "nfsd.export",
550 .cache_put = svc_export_put,
551 .cache_request = svc_export_request,
552 .cache_parse = svc_export_parse,
553 .cache_show = svc_export_show,
554 .match = svc_export_match,
555 .init = svc_export_init,
556 .update = export_update,
557 .alloc = svc_export_alloc,
560 static struct svc_export *
561 svc_export_lookup(struct svc_export *exp)
563 struct cache_head *ch;
565 hash = hash_ptr(exp->ex_client, EXPORT_HASHBITS);
566 hash ^= hash_ptr(exp->ex_dentry, EXPORT_HASHBITS);
567 hash ^= hash_ptr(exp->ex_mnt, EXPORT_HASHBITS);
569 ch = sunrpc_cache_lookup(&svc_export_cache, &exp->h,
572 return container_of(ch, struct svc_export, h);
578 svc_export_update(struct svc_export *new, struct svc_export *old)
580 struct cache_head *ch;
582 hash = hash_ptr(old->ex_client, EXPORT_HASHBITS);
583 hash ^= hash_ptr(old->ex_dentry, EXPORT_HASHBITS);
584 hash ^= hash_ptr(old->ex_mnt, EXPORT_HASHBITS);
586 ch = sunrpc_cache_update(&svc_export_cache, &new->h,
590 return container_of(ch, struct svc_export, h);
597 exp_find_key(svc_client *clp, int fsid_type, u32 *fsidv, struct cache_req *reqp)
599 struct svc_expkey key, *ek;
606 key.ek_fsidtype = fsid_type;
607 memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
609 ek = svc_expkey_lookup(&key);
611 if ((err = cache_check(&svc_expkey_cache, &ek->h, reqp)))
616 static int exp_set_key(svc_client *clp, int fsid_type, u32 *fsidv,
617 struct svc_export *exp)
619 struct svc_expkey key, *ek;
622 key.ek_fsidtype = fsid_type;
623 memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
624 key.ek_mnt = exp->ex_mnt;
625 key.ek_dentry = exp->ex_dentry;
626 key.h.expiry_time = NEVER;
629 ek = svc_expkey_lookup(&key);
631 ek = svc_expkey_update(&key,ek);
633 cache_put(&ek->h, &svc_expkey_cache);
640 * Find the client's export entry matching xdev/xino.
642 static inline struct svc_expkey *
643 exp_get_key(svc_client *clp, dev_t dev, ino_t ino)
647 if (old_valid_dev(dev)) {
648 mk_fsid_v0(fsidv, dev, ino);
649 return exp_find_key(clp, 0, fsidv, NULL);
651 mk_fsid_v3(fsidv, dev, ino);
652 return exp_find_key(clp, 3, fsidv, NULL);
656 * Find the client's export entry matching fsid
658 static inline struct svc_expkey *
659 exp_get_fsid_key(svc_client *clp, int fsid)
663 mk_fsid_v1(fsidv, fsid);
665 return exp_find_key(clp, 1, fsidv, NULL);
669 exp_get_by_name(svc_client *clp, struct vfsmount *mnt, struct dentry *dentry,
670 struct cache_req *reqp)
672 struct svc_export *exp, key;
679 key.ex_dentry = dentry;
681 exp = svc_export_lookup(&key);
683 switch (cache_check(&svc_export_cache, &exp->h, reqp)) {
686 exp = ERR_PTR(-EAGAIN);
696 * Find the export entry for a given dentry.
699 exp_parent(svc_client *clp, struct vfsmount *mnt, struct dentry *dentry,
700 struct cache_req *reqp)
705 exp = exp_get_by_name(clp, mnt, dentry, reqp);
707 while (exp == NULL && !IS_ROOT(dentry)) {
708 struct dentry *parent;
710 parent = dget_parent(dentry);
713 exp = exp_get_by_name(clp, mnt, dentry, reqp);
720 * Hashtable locking. Write locks are placed only by user processes
721 * wanting to modify export information.
722 * Write locking only done in this file. Read locking
726 static DECLARE_RWSEM(hash_sem);
731 down_read(&hash_sem);
737 down_write(&hash_sem);
747 exp_writeunlock(void)
752 static void exp_fsid_unhash(struct svc_export *exp)
754 struct svc_expkey *ek;
756 if ((exp->ex_flags & NFSEXP_FSID) == 0)
759 ek = exp_get_fsid_key(exp->ex_client, exp->ex_fsid);
760 if (ek && !IS_ERR(ek)) {
761 ek->h.expiry_time = get_seconds()-1;
762 cache_put(&ek->h, &svc_expkey_cache);
764 svc_expkey_cache.nextcheck = get_seconds();
767 static int exp_fsid_hash(svc_client *clp, struct svc_export *exp)
771 if ((exp->ex_flags & NFSEXP_FSID) == 0)
774 mk_fsid_v1(fsid, exp->ex_fsid);
775 return exp_set_key(clp, 1, fsid, exp);
778 static int exp_hash(struct auth_domain *clp, struct svc_export *exp)
781 struct inode *inode = exp->ex_dentry->d_inode;
782 dev_t dev = inode->i_sb->s_dev;
784 if (old_valid_dev(dev)) {
785 mk_fsid_v0(fsid, dev, inode->i_ino);
786 return exp_set_key(clp, 0, fsid, exp);
788 mk_fsid_v3(fsid, dev, inode->i_ino);
789 return exp_set_key(clp, 3, fsid, exp);
792 static void exp_unhash(struct svc_export *exp)
794 struct svc_expkey *ek;
795 struct inode *inode = exp->ex_dentry->d_inode;
797 ek = exp_get_key(exp->ex_client, inode->i_sb->s_dev, inode->i_ino);
798 if (ek && !IS_ERR(ek)) {
799 ek->h.expiry_time = get_seconds()-1;
800 cache_put(&ek->h, &svc_expkey_cache);
802 svc_expkey_cache.nextcheck = get_seconds();
806 * Export a file system.
809 exp_export(struct nfsctl_export *nxp)
812 struct svc_export *exp = NULL;
813 struct svc_export new;
814 struct svc_expkey *fsid_key = NULL;
818 /* Consistency check */
820 if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) ||
821 !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX))
824 dprintk("exp_export called for %s:%s (%x/%ld fl %x).\n",
825 nxp->ex_client, nxp->ex_path,
826 (unsigned)nxp->ex_dev, (long)nxp->ex_ino,
829 /* Try to lock the export table for update */
832 /* Look up client info */
833 if (!(clp = auth_domain_find(nxp->ex_client)))
837 /* Look up the dentry */
838 err = path_lookup(nxp->ex_path, 0, &nd);
843 exp = exp_get_by_name(clp, nd.mnt, nd.dentry, NULL);
845 /* must make sure there won't be an ex_fsid clash */
846 if ((nxp->ex_flags & NFSEXP_FSID) &&
847 (fsid_key = exp_get_fsid_key(clp, nxp->ex_dev)) &&
850 (fsid_key->ek_mnt != nd.mnt || fsid_key->ek_dentry != nd.dentry) )
854 /* just a flags/id/fsid update */
856 exp_fsid_unhash(exp);
857 exp->ex_flags = nxp->ex_flags;
858 exp->ex_anon_uid = nxp->ex_anon_uid;
859 exp->ex_anon_gid = nxp->ex_anon_gid;
860 exp->ex_fsid = nxp->ex_dev;
862 err = exp_fsid_hash(clp, exp);
866 err = check_export(nd.dentry->d_inode, nxp->ex_flags);
867 if (err) goto finish;
871 dprintk("nfsd: creating export entry %p for client %p\n", exp, clp);
873 new.h.expiry_time = NEVER;
877 new.ex_dentry = nd.dentry;
878 new.ex_flags = nxp->ex_flags;
879 new.ex_anon_uid = nxp->ex_anon_uid;
880 new.ex_anon_gid = nxp->ex_anon_gid;
881 new.ex_fsid = nxp->ex_dev;
883 exp = svc_export_lookup(&new);
885 exp = svc_export_update(&new, exp);
890 if (exp_hash(clp, exp) ||
891 exp_fsid_hash(clp, exp)) {
892 /* failed to create at least one index */
893 exp_do_unexport(exp);
901 if (fsid_key && !IS_ERR(fsid_key))
902 cache_put(&fsid_key->h, &svc_expkey_cache);
904 auth_domain_put(clp);
913 * Unexport a file system. The export entry has already
914 * been removed from the client's list of exported fs's.
917 exp_do_unexport(svc_export *unexp)
919 unexp->h.expiry_time = get_seconds()-1;
920 svc_export_cache.nextcheck = get_seconds();
922 exp_fsid_unhash(unexp);
930 exp_unexport(struct nfsctl_export *nxp)
932 struct auth_domain *dom;
937 /* Consistency check */
938 if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) ||
939 !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX))
945 dom = auth_domain_find(nxp->ex_client);
947 dprintk("nfsd: unexport couldn't find %s\n", nxp->ex_client);
951 err = path_lookup(nxp->ex_path, 0, &nd);
956 exp = exp_get_by_name(dom, nd.mnt, nd.dentry, NULL);
961 exp_do_unexport(exp);
966 auth_domain_put(dom);
974 * Obtain the root fh on behalf of a client.
975 * This could be done in user space, but I feel that it adds some safety
976 * since its harder to fool a kernel module than a user space program.
979 exp_rootfh(svc_client *clp, char *path, struct knfsd_fh *f, int maxsize)
981 struct svc_export *exp;
988 /* NB: we probably ought to check that it's NUL-terminated */
989 if (path_lookup(path, 0, &nd)) {
990 printk("nfsd: exp_rootfh path not found %s", path);
993 inode = nd.dentry->d_inode;
995 dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n",
996 path, nd.dentry, clp->name,
997 inode->i_sb->s_id, inode->i_ino);
998 exp = exp_parent(clp, nd.mnt, nd.dentry, NULL);
1000 dprintk("nfsd: exp_rootfh export not found.\n");
1005 * fh must be initialized before calling fh_compose
1007 fh_init(&fh, maxsize);
1008 if (fh_compose(&fh, exp, nd.dentry, NULL))
1012 memcpy(f, &fh.fh_handle, sizeof(struct knfsd_fh));
1021 exp_find(struct auth_domain *clp, int fsid_type, u32 *fsidv,
1022 struct cache_req *reqp)
1024 struct svc_export *exp;
1025 struct svc_expkey *ek = exp_find_key(clp, fsid_type, fsidv, reqp);
1026 if (!ek || IS_ERR(ek))
1027 return ERR_PTR(PTR_ERR(ek));
1029 exp = exp_get_by_name(clp, ek->ek_mnt, ek->ek_dentry, reqp);
1030 cache_put(&ek->h, &svc_expkey_cache);
1032 if (!exp || IS_ERR(exp))
1033 return ERR_PTR(PTR_ERR(exp));
1039 * Called when we need the filehandle for the root of the pseudofs,
1040 * for a given NFSv4 client. The root is defined to be the
1041 * export point with fsid==0
1044 exp_pseudoroot(struct auth_domain *clp, struct svc_fh *fhp,
1045 struct cache_req *creq)
1047 struct svc_expkey *fsid_key;
1048 struct svc_export *exp;
1052 mk_fsid_v1(fsidv, 0);
1054 fsid_key = exp_find_key(clp, 1, fsidv, creq);
1055 if (IS_ERR(fsid_key) && PTR_ERR(fsid_key) == -EAGAIN)
1056 return nfserr_dropit;
1057 if (!fsid_key || IS_ERR(fsid_key))
1060 exp = exp_get_by_name(clp, fsid_key->ek_mnt, fsid_key->ek_dentry, creq);
1063 else if (IS_ERR(exp))
1064 rv = nfserrno(PTR_ERR(exp));
1066 rv = fh_compose(fhp, exp,
1067 fsid_key->ek_dentry, NULL);
1068 cache_put(&fsid_key->h, &svc_expkey_cache);
1074 static void *e_start(struct seq_file *m, loff_t *pos)
1077 unsigned hash, export;
1078 struct cache_head *ch;
1081 read_lock(&svc_export_cache.hash_lock);
1085 export = n & ((1LL<<32) - 1);
1088 for (ch=export_table[hash]; ch; ch=ch->next)
1091 n &= ~((1LL<<32) - 1);
1095 } while(hash < EXPORT_HASHMAX && export_table[hash]==NULL);
1096 if (hash >= EXPORT_HASHMAX)
1099 return export_table[hash];
1102 static void *e_next(struct seq_file *m, void *p, loff_t *pos)
1104 struct cache_head *ch = p;
1105 int hash = (*pos >> 32);
1109 else if (ch->next == NULL) {
1116 *pos &= ~((1LL<<32) - 1);
1117 while (hash < EXPORT_HASHMAX && export_table[hash] == NULL) {
1121 if (hash >= EXPORT_HASHMAX)
1124 return export_table[hash];
1127 static void e_stop(struct seq_file *m, void *p)
1129 read_unlock(&svc_export_cache.hash_lock);
1133 static struct flags {
1137 { NFSEXP_READONLY, {"ro", "rw"}},
1138 { NFSEXP_INSECURE_PORT, {"insecure", ""}},
1139 { NFSEXP_ROOTSQUASH, {"root_squash", "no_root_squash"}},
1140 { NFSEXP_ALLSQUASH, {"all_squash", ""}},
1141 { NFSEXP_ASYNC, {"async", "sync"}},
1142 { NFSEXP_GATHERED_WRITES, {"wdelay", "no_wdelay"}},
1143 { NFSEXP_NOHIDE, {"nohide", ""}},
1144 { NFSEXP_CROSSMOUNT, {"crossmnt", ""}},
1145 { NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}},
1146 { NFSEXP_NOAUTHNLM, {"insecure_locks", ""}},
1148 { NFSEXP_MSNFS, {"msnfs", ""}},
1153 static void exp_flags(struct seq_file *m, int flag, int fsid, uid_t anonu, uid_t anong)
1158 for (flg = expflags; flg->flag; flg++) {
1159 int state = (flg->flag & flag)?0:1;
1160 if (*flg->name[state])
1161 seq_printf(m, "%s%s", first++?",":"", flg->name[state]);
1163 if (flag & NFSEXP_FSID)
1164 seq_printf(m, "%sfsid=%d", first++?",":"", fsid);
1165 if (anonu != (uid_t)-2 && anonu != (0x10000-2))
1166 seq_printf(m, "%sanonuid=%d", first++?",":"", anonu);
1167 if (anong != (gid_t)-2 && anong != (0x10000-2))
1168 seq_printf(m, "%sanongid=%d", first++?",":"", anong);
1171 static int e_show(struct seq_file *m, void *p)
1173 struct cache_head *cp = p;
1174 struct svc_export *exp = container_of(cp, struct svc_export, h);
1177 if (p == (void *)1) {
1178 seq_puts(m, "# Version 1.1\n");
1179 seq_puts(m, "# Path Client(Flags) # IPs\n");
1183 clp = exp->ex_client;
1185 if (cache_check(&svc_export_cache, &exp->h, NULL))
1187 cache_put(&exp->h, &svc_export_cache);
1188 return svc_export_show(m, &svc_export_cache, cp);
1191 struct seq_operations nfs_exports_op = {
1199 * Add or modify a client.
1200 * Change requests may involve the list of host addresses. The list of
1201 * exports and possibly existing uid maps are left untouched.
1204 exp_addclient(struct nfsctl_client *ncp)
1206 struct auth_domain *dom;
1209 /* First, consistency check. */
1211 if (! exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX))
1213 if (ncp->cl_naddr > NFSCLNT_ADDRMAX)
1216 /* Lock the hashtable */
1219 dom = unix_domain_find(ncp->cl_ident);
1225 /* Insert client into hashtable. */
1226 for (i = 0; i < ncp->cl_naddr; i++)
1227 auth_unix_add_addr(ncp->cl_addrlist[i], dom);
1229 auth_unix_forget_old(dom);
1230 auth_domain_put(dom);
1241 * Delete a client given an identifier.
1244 exp_delclient(struct nfsctl_client *ncp)
1247 struct auth_domain *dom;
1250 if (!exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX))
1253 /* Lock the hashtable */
1256 dom = auth_domain_find(ncp->cl_ident);
1257 /* just make sure that no addresses work
1258 * and that it will expire soon
1261 err = auth_unix_forget_old(dom);
1262 auth_domain_put(dom);
1271 * Verify that string is non-empty and does not exceed max length.
1274 exp_verify_string(char *cp, int max)
1278 for (i = 0; i < max; i++)
1282 printk(KERN_NOTICE "nfsd: couldn't validate string %s\n", cp);
1287 * Initialize the exports module.
1290 nfsd_export_init(void)
1292 dprintk("nfsd: initializing export module.\n");
1294 cache_register(&svc_export_cache);
1295 cache_register(&svc_expkey_cache);
1300 * Flush exports table - called when last nfsd thread is killed
1303 nfsd_export_flush(void)
1306 cache_purge(&svc_expkey_cache);
1307 cache_purge(&svc_export_cache);
1312 * Shutdown the exports module.
1315 nfsd_export_shutdown(void)
1318 dprintk("nfsd: shutting down export module.\n");
1322 if (cache_unregister(&svc_expkey_cache))
1323 printk(KERN_ERR "nfsd: failed to unregister expkey cache\n");
1324 if (cache_unregister(&svc_export_cache))
1325 printk(KERN_ERR "nfsd: failed to unregister export cache\n");
1326 svcauth_unix_purge();
1329 dprintk("nfsd: export shutdown complete.\n");