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 inline int svc_expkey_hash(struct svc_expkey *item)
62 int hash = item->ek_fsidtype;
63 char * cp = (char*)item->ek_fsid;
64 int len = key_len(item->ek_fsidtype);
66 hash ^= hash_mem(cp, len, EXPKEY_HASHBITS);
67 hash ^= hash_ptr(item->ek_client, EXPKEY_HASHBITS);
68 return hash & EXPKEY_HASHMASK;
71 void expkey_put(struct cache_head *item, struct cache_detail *cd)
73 if (cache_put(item, cd)) {
74 struct svc_expkey *key = container_of(item, struct svc_expkey, h);
75 if (test_bit(CACHE_VALID, &item->flags) &&
76 !test_bit(CACHE_NEGATIVE, &item->flags)) {
80 auth_domain_put(key->ek_client);
85 static void expkey_request(struct cache_detail *cd,
87 char **bpp, int *blen)
89 /* client fsidtype \xfsid */
90 struct svc_expkey *ek = container_of(h, struct svc_expkey, h);
93 qword_add(bpp, blen, ek->ek_client->name);
94 snprintf(type, 5, "%d", ek->ek_fsidtype);
95 qword_add(bpp, blen, type);
96 qword_addhex(bpp, blen, (char*)ek->ek_fsid, key_len(ek->ek_fsidtype));
100 static struct svc_expkey *svc_expkey_lookup(struct svc_expkey *, int);
101 static int expkey_parse(struct cache_detail *cd, char *mesg, int mlen)
103 /* client fsidtype fsid [path] */
106 struct auth_domain *dom = NULL;
110 struct svc_expkey key;
112 if (mesg[mlen-1] != '\n')
116 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
121 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
125 dom = auth_domain_find(buf);
128 dprintk("found domain %s\n", buf);
131 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
133 fsidtype = simple_strtoul(buf, &ep, 10);
136 dprintk("found fsidtype %d\n", fsidtype);
139 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
141 dprintk("found fsid length %d\n", len);
142 if (len != key_len(fsidtype))
145 /* OK, we seem to have a valid key */
147 key.h.expiry_time = get_expiry(&mesg);
148 if (key.h.expiry_time == 0)
152 key.ek_fsidtype = fsidtype;
153 memcpy(key.ek_fsid, buf, len);
155 /* now we want a pathname, or empty meaning NEGATIVE */
156 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) < 0)
158 dprintk("Path seems to be <%s>\n", buf);
161 struct svc_expkey *ek;
162 set_bit(CACHE_NEGATIVE, &key.h.flags);
163 ek = svc_expkey_lookup(&key, 1);
165 expkey_put(&ek->h, &svc_expkey_cache);
168 struct svc_expkey *ek;
169 err = path_lookup(buf, 0, &nd);
173 dprintk("Found the path %s\n", buf);
175 key.ek_dentry = nd.dentry;
177 ek = svc_expkey_lookup(&key, 1);
179 expkey_put(&ek->h, &svc_expkey_cache);
186 auth_domain_put(dom);
191 static int expkey_show(struct seq_file *m,
192 struct cache_detail *cd,
193 struct cache_head *h)
195 struct svc_expkey *ek ;
198 seq_puts(m, "#domain fsidtype fsid [path]\n");
201 ek = container_of(h, struct svc_expkey, h);
202 seq_printf(m, "%s %d 0x%08x", ek->ek_client->name,
203 ek->ek_fsidtype, ek->ek_fsid[0]);
204 if (ek->ek_fsidtype != 1)
205 seq_printf(m, "%08x", ek->ek_fsid[1]);
206 if (ek->ek_fsidtype == 2)
207 seq_printf(m, "%08x", ek->ek_fsid[2]);
208 if (test_bit(CACHE_VALID, &h->flags) &&
209 !test_bit(CACHE_NEGATIVE, &h->flags)) {
211 seq_path(m, ek->ek_mnt, ek->ek_dentry, "\\ \t\n");
217 struct cache_detail svc_expkey_cache = {
218 .owner = THIS_MODULE,
219 .hash_size = EXPKEY_HASHMAX,
220 .hash_table = expkey_table,
222 .cache_put = expkey_put,
223 .cache_request = expkey_request,
224 .cache_parse = expkey_parse,
225 .cache_show = expkey_show,
228 static inline int svc_expkey_match (struct svc_expkey *a, struct svc_expkey *b)
230 if (a->ek_fsidtype != b->ek_fsidtype ||
231 a->ek_client != b->ek_client ||
232 memcmp(a->ek_fsid, b->ek_fsid, key_len(a->ek_fsidtype)) != 0)
237 static inline void svc_expkey_init(struct svc_expkey *new, struct svc_expkey *item)
239 kref_get(&item->ek_client->ref);
240 new->ek_client = item->ek_client;
241 new->ek_fsidtype = item->ek_fsidtype;
242 new->ek_fsid[0] = item->ek_fsid[0];
243 new->ek_fsid[1] = item->ek_fsid[1];
244 new->ek_fsid[2] = item->ek_fsid[2];
247 static inline void svc_expkey_update(struct svc_expkey *new, struct svc_expkey *item)
249 new->ek_mnt = mntget(item->ek_mnt);
250 new->ek_dentry = dget(item->ek_dentry);
253 static DefineSimpleCacheLookup(svc_expkey, svc_expkey)
255 #define EXPORT_HASHBITS 8
256 #define EXPORT_HASHMAX (1<< EXPORT_HASHBITS)
257 #define EXPORT_HASHMASK (EXPORT_HASHMAX -1)
259 static struct cache_head *export_table[EXPORT_HASHMAX];
261 void svc_export_put(struct cache_head *item, struct cache_detail *cd)
263 if (cache_put(item, cd)) {
264 struct svc_export *exp = container_of(item, struct svc_export, h);
265 dput(exp->ex_dentry);
267 auth_domain_put(exp->ex_client);
272 static void svc_export_request(struct cache_detail *cd,
273 struct cache_head *h,
274 char **bpp, int *blen)
277 struct svc_export *exp = container_of(h, struct svc_export, h);
280 qword_add(bpp, blen, exp->ex_client->name);
281 pth = d_path(exp->ex_dentry, exp->ex_mnt, *bpp, *blen);
283 /* is this correct? */
287 qword_add(bpp, blen, pth);
291 struct svc_export *svc_export_update(struct svc_export *new, struct svc_export *old);
292 static struct svc_export *svc_export_lookup(struct svc_export *);
294 static int check_export(struct inode *inode, int flags)
297 /* We currently export only dirs and regular files.
298 * This is what umountd does.
300 if (!S_ISDIR(inode->i_mode) &&
301 !S_ISREG(inode->i_mode))
304 /* There are two requirements on a filesystem to be exportable.
305 * 1: We must be able to identify the filesystem from a number.
306 * either a device number (so FS_REQUIRES_DEV needed)
307 * or an FSID number (so NFSEXP_FSID needed).
308 * 2: We must be able to find an inode from a filehandle.
309 * This means that s_export_op must be set.
311 if (!(inode->i_sb->s_type->fs_flags & FS_REQUIRES_DEV) &&
312 !(flags & NFSEXP_FSID)) {
313 dprintk("exp_export: export of non-dev fs without fsid");
316 if (!inode->i_sb->s_export_op) {
317 dprintk("exp_export: export of invalid fs type.\n");
321 /* Ok, we can export it */;
322 if (!inode->i_sb->s_export_op->find_exported_dentry)
323 inode->i_sb->s_export_op->find_exported_dentry =
324 find_exported_dentry;
329 static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen)
331 /* client path expiry [flags anonuid anongid fsid] */
335 struct auth_domain *dom = NULL;
337 struct svc_export exp, *expp;
342 if (mesg[mlen-1] != '\n')
346 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
351 len = qword_get(&mesg, buf, PAGE_SIZE);
353 if (len <= 0) goto out;
356 dom = auth_domain_find(buf);
362 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
364 err = path_lookup(buf, 0, &nd);
370 exp.ex_dentry = nd.dentry;
374 exp.h.expiry_time = get_expiry(&mesg);
375 if (exp.h.expiry_time == 0)
379 err = get_int(&mesg, &an_int);
381 set_bit(CACHE_NEGATIVE, &exp.h.flags);
383 if (err || an_int < 0) goto out;
384 exp.ex_flags= an_int;
387 err = get_int(&mesg, &an_int);
389 exp.ex_anon_uid= an_int;
392 err = get_int(&mesg, &an_int);
394 exp.ex_anon_gid= an_int;
397 err = get_int(&mesg, &an_int);
399 exp.ex_fsid = an_int;
401 err = check_export(nd.dentry->d_inode, exp.ex_flags);
405 expp = svc_export_lookup(&exp);
407 expp = svc_export_update(&exp, expp);
419 auth_domain_put(dom);
424 static void exp_flags(struct seq_file *m, int flag, int fsid, uid_t anonu, uid_t anong);
426 static int svc_export_show(struct seq_file *m,
427 struct cache_detail *cd,
428 struct cache_head *h)
430 struct svc_export *exp ;
433 seq_puts(m, "#path domain(flags)\n");
436 exp = container_of(h, struct svc_export, h);
437 seq_path(m, exp->ex_mnt, exp->ex_dentry, " \t\n\\");
439 seq_escape(m, exp->ex_client->name, " \t\n\\");
441 if (test_bit(CACHE_VALID, &h->flags) &&
442 !test_bit(CACHE_NEGATIVE, &h->flags))
443 exp_flags(m, exp->ex_flags, exp->ex_fsid,
444 exp->ex_anon_uid, exp->ex_anon_gid);
448 static int svc_export_match(struct cache_head *a, struct cache_head *b)
450 struct svc_export *orig = container_of(a, struct svc_export, h);
451 struct svc_export *new = container_of(b, struct svc_export, h);
452 return orig->ex_client == new->ex_client &&
453 orig->ex_dentry == new->ex_dentry &&
454 orig->ex_mnt == new->ex_mnt;
457 static void svc_export_init(struct cache_head *cnew, struct cache_head *citem)
459 struct svc_export *new = container_of(cnew, struct svc_export, h);
460 struct svc_export *item = container_of(citem, struct svc_export, h);
462 kref_get(&item->ex_client->ref);
463 new->ex_client = item->ex_client;
464 new->ex_dentry = dget(item->ex_dentry);
465 new->ex_mnt = mntget(item->ex_mnt);
468 static void export_update(struct cache_head *cnew, struct cache_head *citem)
470 struct svc_export *new = container_of(cnew, struct svc_export, h);
471 struct svc_export *item = container_of(citem, struct svc_export, h);
473 new->ex_flags = item->ex_flags;
474 new->ex_anon_uid = item->ex_anon_uid;
475 new->ex_anon_gid = item->ex_anon_gid;
476 new->ex_fsid = item->ex_fsid;
479 static struct cache_head *svc_export_alloc(void)
481 struct svc_export *i = kmalloc(sizeof(*i), GFP_KERNEL);
488 struct cache_detail svc_export_cache = {
489 .owner = THIS_MODULE,
490 .hash_size = EXPORT_HASHMAX,
491 .hash_table = export_table,
492 .name = "nfsd.export",
493 .cache_put = svc_export_put,
494 .cache_request = svc_export_request,
495 .cache_parse = svc_export_parse,
496 .cache_show = svc_export_show,
497 .match = svc_export_match,
498 .init = svc_export_init,
499 .update = export_update,
500 .alloc = svc_export_alloc,
503 static struct svc_export *
504 svc_export_lookup(struct svc_export *exp)
506 struct cache_head *ch;
508 hash = hash_ptr(exp->ex_client, EXPORT_HASHBITS);
509 hash ^= hash_ptr(exp->ex_dentry, EXPORT_HASHBITS);
510 hash ^= hash_ptr(exp->ex_mnt, EXPORT_HASHBITS);
512 ch = sunrpc_cache_lookup(&svc_export_cache, &exp->h,
515 return container_of(ch, struct svc_export, h);
521 svc_export_update(struct svc_export *new, struct svc_export *old)
523 struct cache_head *ch;
525 hash = hash_ptr(old->ex_client, EXPORT_HASHBITS);
526 hash ^= hash_ptr(old->ex_dentry, EXPORT_HASHBITS);
527 hash ^= hash_ptr(old->ex_mnt, EXPORT_HASHBITS);
529 ch = sunrpc_cache_update(&svc_export_cache, &new->h,
533 return container_of(ch, struct svc_export, h);
540 exp_find_key(svc_client *clp, int fsid_type, u32 *fsidv, struct cache_req *reqp)
542 struct svc_expkey key, *ek;
549 key.ek_fsidtype = fsid_type;
550 memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
552 ek = svc_expkey_lookup(&key, 0);
554 if ((err = cache_check(&svc_expkey_cache, &ek->h, reqp)))
559 static int exp_set_key(svc_client *clp, int fsid_type, u32 *fsidv,
560 struct svc_export *exp)
562 struct svc_expkey key, *ek;
565 key.ek_fsidtype = fsid_type;
566 memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
567 key.ek_mnt = exp->ex_mnt;
568 key.ek_dentry = exp->ex_dentry;
569 key.h.expiry_time = NEVER;
572 ek = svc_expkey_lookup(&key, 1);
574 expkey_put(&ek->h, &svc_expkey_cache);
581 * Find the client's export entry matching xdev/xino.
583 static inline struct svc_expkey *
584 exp_get_key(svc_client *clp, dev_t dev, ino_t ino)
588 if (old_valid_dev(dev)) {
589 mk_fsid_v0(fsidv, dev, ino);
590 return exp_find_key(clp, 0, fsidv, NULL);
592 mk_fsid_v3(fsidv, dev, ino);
593 return exp_find_key(clp, 3, fsidv, NULL);
597 * Find the client's export entry matching fsid
599 static inline struct svc_expkey *
600 exp_get_fsid_key(svc_client *clp, int fsid)
604 mk_fsid_v1(fsidv, fsid);
606 return exp_find_key(clp, 1, fsidv, NULL);
610 exp_get_by_name(svc_client *clp, struct vfsmount *mnt, struct dentry *dentry,
611 struct cache_req *reqp)
613 struct svc_export *exp, key;
620 key.ex_dentry = dentry;
622 exp = svc_export_lookup(&key);
624 switch (cache_check(&svc_export_cache, &exp->h, reqp)) {
627 exp = ERR_PTR(-EAGAIN);
637 * Find the export entry for a given dentry.
640 exp_parent(svc_client *clp, struct vfsmount *mnt, struct dentry *dentry,
641 struct cache_req *reqp)
646 exp = exp_get_by_name(clp, mnt, dentry, reqp);
648 while (exp == NULL && !IS_ROOT(dentry)) {
649 struct dentry *parent;
651 parent = dget_parent(dentry);
654 exp = exp_get_by_name(clp, mnt, dentry, reqp);
661 * Hashtable locking. Write locks are placed only by user processes
662 * wanting to modify export information.
663 * Write locking only done in this file. Read locking
667 static DECLARE_RWSEM(hash_sem);
672 down_read(&hash_sem);
678 down_write(&hash_sem);
688 exp_writeunlock(void)
693 static void exp_fsid_unhash(struct svc_export *exp)
695 struct svc_expkey *ek;
697 if ((exp->ex_flags & NFSEXP_FSID) == 0)
700 ek = exp_get_fsid_key(exp->ex_client, exp->ex_fsid);
701 if (ek && !IS_ERR(ek)) {
702 ek->h.expiry_time = get_seconds()-1;
703 expkey_put(&ek->h, &svc_expkey_cache);
705 svc_expkey_cache.nextcheck = get_seconds();
708 static int exp_fsid_hash(svc_client *clp, struct svc_export *exp)
712 if ((exp->ex_flags & NFSEXP_FSID) == 0)
715 mk_fsid_v1(fsid, exp->ex_fsid);
716 return exp_set_key(clp, 1, fsid, exp);
719 static int exp_hash(struct auth_domain *clp, struct svc_export *exp)
722 struct inode *inode = exp->ex_dentry->d_inode;
723 dev_t dev = inode->i_sb->s_dev;
725 if (old_valid_dev(dev)) {
726 mk_fsid_v0(fsid, dev, inode->i_ino);
727 return exp_set_key(clp, 0, fsid, exp);
729 mk_fsid_v3(fsid, dev, inode->i_ino);
730 return exp_set_key(clp, 3, fsid, exp);
733 static void exp_unhash(struct svc_export *exp)
735 struct svc_expkey *ek;
736 struct inode *inode = exp->ex_dentry->d_inode;
738 ek = exp_get_key(exp->ex_client, inode->i_sb->s_dev, inode->i_ino);
739 if (ek && !IS_ERR(ek)) {
740 ek->h.expiry_time = get_seconds()-1;
741 expkey_put(&ek->h, &svc_expkey_cache);
743 svc_expkey_cache.nextcheck = get_seconds();
747 * Export a file system.
750 exp_export(struct nfsctl_export *nxp)
753 struct svc_export *exp = NULL;
754 struct svc_export new;
755 struct svc_expkey *fsid_key = NULL;
759 /* Consistency check */
761 if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) ||
762 !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX))
765 dprintk("exp_export called for %s:%s (%x/%ld fl %x).\n",
766 nxp->ex_client, nxp->ex_path,
767 (unsigned)nxp->ex_dev, (long)nxp->ex_ino,
770 /* Try to lock the export table for update */
773 /* Look up client info */
774 if (!(clp = auth_domain_find(nxp->ex_client)))
778 /* Look up the dentry */
779 err = path_lookup(nxp->ex_path, 0, &nd);
784 exp = exp_get_by_name(clp, nd.mnt, nd.dentry, NULL);
786 /* must make sure there won't be an ex_fsid clash */
787 if ((nxp->ex_flags & NFSEXP_FSID) &&
788 (fsid_key = exp_get_fsid_key(clp, nxp->ex_dev)) &&
791 (fsid_key->ek_mnt != nd.mnt || fsid_key->ek_dentry != nd.dentry) )
795 /* just a flags/id/fsid update */
797 exp_fsid_unhash(exp);
798 exp->ex_flags = nxp->ex_flags;
799 exp->ex_anon_uid = nxp->ex_anon_uid;
800 exp->ex_anon_gid = nxp->ex_anon_gid;
801 exp->ex_fsid = nxp->ex_dev;
803 err = exp_fsid_hash(clp, exp);
807 err = check_export(nd.dentry->d_inode, nxp->ex_flags);
808 if (err) goto finish;
812 dprintk("nfsd: creating export entry %p for client %p\n", exp, clp);
814 new.h.expiry_time = NEVER;
818 new.ex_dentry = nd.dentry;
819 new.ex_flags = nxp->ex_flags;
820 new.ex_anon_uid = nxp->ex_anon_uid;
821 new.ex_anon_gid = nxp->ex_anon_gid;
822 new.ex_fsid = nxp->ex_dev;
824 exp = svc_export_lookup(&new);
826 exp = svc_export_update(&new, exp);
831 if (exp_hash(clp, exp) ||
832 exp_fsid_hash(clp, exp)) {
833 /* failed to create at least one index */
834 exp_do_unexport(exp);
842 if (fsid_key && !IS_ERR(fsid_key))
843 expkey_put(&fsid_key->h, &svc_expkey_cache);
845 auth_domain_put(clp);
854 * Unexport a file system. The export entry has already
855 * been removed from the client's list of exported fs's.
858 exp_do_unexport(svc_export *unexp)
860 unexp->h.expiry_time = get_seconds()-1;
861 svc_export_cache.nextcheck = get_seconds();
863 exp_fsid_unhash(unexp);
871 exp_unexport(struct nfsctl_export *nxp)
873 struct auth_domain *dom;
878 /* Consistency check */
879 if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) ||
880 !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX))
886 dom = auth_domain_find(nxp->ex_client);
888 dprintk("nfsd: unexport couldn't find %s\n", nxp->ex_client);
892 err = path_lookup(nxp->ex_path, 0, &nd);
897 exp = exp_get_by_name(dom, nd.mnt, nd.dentry, NULL);
902 exp_do_unexport(exp);
907 auth_domain_put(dom);
915 * Obtain the root fh on behalf of a client.
916 * This could be done in user space, but I feel that it adds some safety
917 * since its harder to fool a kernel module than a user space program.
920 exp_rootfh(svc_client *clp, char *path, struct knfsd_fh *f, int maxsize)
922 struct svc_export *exp;
929 /* NB: we probably ought to check that it's NUL-terminated */
930 if (path_lookup(path, 0, &nd)) {
931 printk("nfsd: exp_rootfh path not found %s", path);
934 inode = nd.dentry->d_inode;
936 dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n",
937 path, nd.dentry, clp->name,
938 inode->i_sb->s_id, inode->i_ino);
939 exp = exp_parent(clp, nd.mnt, nd.dentry, NULL);
941 dprintk("nfsd: exp_rootfh export not found.\n");
946 * fh must be initialized before calling fh_compose
948 fh_init(&fh, maxsize);
949 if (fh_compose(&fh, exp, nd.dentry, NULL))
953 memcpy(f, &fh.fh_handle, sizeof(struct knfsd_fh));
962 exp_find(struct auth_domain *clp, int fsid_type, u32 *fsidv,
963 struct cache_req *reqp)
965 struct svc_export *exp;
966 struct svc_expkey *ek = exp_find_key(clp, fsid_type, fsidv, reqp);
967 if (!ek || IS_ERR(ek))
968 return ERR_PTR(PTR_ERR(ek));
970 exp = exp_get_by_name(clp, ek->ek_mnt, ek->ek_dentry, reqp);
971 expkey_put(&ek->h, &svc_expkey_cache);
973 if (!exp || IS_ERR(exp))
974 return ERR_PTR(PTR_ERR(exp));
980 * Called when we need the filehandle for the root of the pseudofs,
981 * for a given NFSv4 client. The root is defined to be the
982 * export point with fsid==0
985 exp_pseudoroot(struct auth_domain *clp, struct svc_fh *fhp,
986 struct cache_req *creq)
988 struct svc_expkey *fsid_key;
989 struct svc_export *exp;
993 mk_fsid_v1(fsidv, 0);
995 fsid_key = exp_find_key(clp, 1, fsidv, creq);
996 if (IS_ERR(fsid_key) && PTR_ERR(fsid_key) == -EAGAIN)
997 return nfserr_dropit;
998 if (!fsid_key || IS_ERR(fsid_key))
1001 exp = exp_get_by_name(clp, fsid_key->ek_mnt, fsid_key->ek_dentry, creq);
1004 else if (IS_ERR(exp))
1005 rv = nfserrno(PTR_ERR(exp));
1007 rv = fh_compose(fhp, exp,
1008 fsid_key->ek_dentry, NULL);
1009 expkey_put(&fsid_key->h, &svc_expkey_cache);
1015 static void *e_start(struct seq_file *m, loff_t *pos)
1018 unsigned hash, export;
1019 struct cache_head *ch;
1022 read_lock(&svc_export_cache.hash_lock);
1026 export = n & ((1LL<<32) - 1);
1029 for (ch=export_table[hash]; ch; ch=ch->next)
1032 n &= ~((1LL<<32) - 1);
1036 } while(hash < EXPORT_HASHMAX && export_table[hash]==NULL);
1037 if (hash >= EXPORT_HASHMAX)
1040 return export_table[hash];
1043 static void *e_next(struct seq_file *m, void *p, loff_t *pos)
1045 struct cache_head *ch = p;
1046 int hash = (*pos >> 32);
1050 else if (ch->next == NULL) {
1057 *pos &= ~((1LL<<32) - 1);
1058 while (hash < EXPORT_HASHMAX && export_table[hash] == NULL) {
1062 if (hash >= EXPORT_HASHMAX)
1065 return export_table[hash];
1068 static void e_stop(struct seq_file *m, void *p)
1070 read_unlock(&svc_export_cache.hash_lock);
1074 static struct flags {
1078 { NFSEXP_READONLY, {"ro", "rw"}},
1079 { NFSEXP_INSECURE_PORT, {"insecure", ""}},
1080 { NFSEXP_ROOTSQUASH, {"root_squash", "no_root_squash"}},
1081 { NFSEXP_ALLSQUASH, {"all_squash", ""}},
1082 { NFSEXP_ASYNC, {"async", "sync"}},
1083 { NFSEXP_GATHERED_WRITES, {"wdelay", "no_wdelay"}},
1084 { NFSEXP_NOHIDE, {"nohide", ""}},
1085 { NFSEXP_CROSSMOUNT, {"crossmnt", ""}},
1086 { NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}},
1087 { NFSEXP_NOAUTHNLM, {"insecure_locks", ""}},
1089 { NFSEXP_MSNFS, {"msnfs", ""}},
1094 static void exp_flags(struct seq_file *m, int flag, int fsid, uid_t anonu, uid_t anong)
1099 for (flg = expflags; flg->flag; flg++) {
1100 int state = (flg->flag & flag)?0:1;
1101 if (*flg->name[state])
1102 seq_printf(m, "%s%s", first++?",":"", flg->name[state]);
1104 if (flag & NFSEXP_FSID)
1105 seq_printf(m, "%sfsid=%d", first++?",":"", fsid);
1106 if (anonu != (uid_t)-2 && anonu != (0x10000-2))
1107 seq_printf(m, "%sanonuid=%d", first++?",":"", anonu);
1108 if (anong != (gid_t)-2 && anong != (0x10000-2))
1109 seq_printf(m, "%sanongid=%d", first++?",":"", anong);
1112 static int e_show(struct seq_file *m, void *p)
1114 struct cache_head *cp = p;
1115 struct svc_export *exp = container_of(cp, struct svc_export, h);
1118 if (p == (void *)1) {
1119 seq_puts(m, "# Version 1.1\n");
1120 seq_puts(m, "# Path Client(Flags) # IPs\n");
1124 clp = exp->ex_client;
1126 if (cache_check(&svc_export_cache, &exp->h, NULL))
1128 if (cache_put(&exp->h, &svc_export_cache)) BUG();
1129 return svc_export_show(m, &svc_export_cache, cp);
1132 struct seq_operations nfs_exports_op = {
1140 * Add or modify a client.
1141 * Change requests may involve the list of host addresses. The list of
1142 * exports and possibly existing uid maps are left untouched.
1145 exp_addclient(struct nfsctl_client *ncp)
1147 struct auth_domain *dom;
1150 /* First, consistency check. */
1152 if (! exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX))
1154 if (ncp->cl_naddr > NFSCLNT_ADDRMAX)
1157 /* Lock the hashtable */
1160 dom = unix_domain_find(ncp->cl_ident);
1166 /* Insert client into hashtable. */
1167 for (i = 0; i < ncp->cl_naddr; i++)
1168 auth_unix_add_addr(ncp->cl_addrlist[i], dom);
1170 auth_unix_forget_old(dom);
1171 auth_domain_put(dom);
1182 * Delete a client given an identifier.
1185 exp_delclient(struct nfsctl_client *ncp)
1188 struct auth_domain *dom;
1191 if (!exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX))
1194 /* Lock the hashtable */
1197 dom = auth_domain_find(ncp->cl_ident);
1198 /* just make sure that no addresses work
1199 * and that it will expire soon
1202 err = auth_unix_forget_old(dom);
1203 auth_domain_put(dom);
1212 * Verify that string is non-empty and does not exceed max length.
1215 exp_verify_string(char *cp, int max)
1219 for (i = 0; i < max; i++)
1223 printk(KERN_NOTICE "nfsd: couldn't validate string %s\n", cp);
1228 * Initialize the exports module.
1231 nfsd_export_init(void)
1233 dprintk("nfsd: initializing export module.\n");
1235 cache_register(&svc_export_cache);
1236 cache_register(&svc_expkey_cache);
1241 * Flush exports table - called when last nfsd thread is killed
1244 nfsd_export_flush(void)
1247 cache_purge(&svc_expkey_cache);
1248 cache_purge(&svc_export_cache);
1253 * Shutdown the exports module.
1256 nfsd_export_shutdown(void)
1259 dprintk("nfsd: shutting down export module.\n");
1263 if (cache_unregister(&svc_expkey_cache))
1264 printk(KERN_ERR "nfsd: failed to unregister expkey cache\n");
1265 if (cache_unregister(&svc_export_cache))
1266 printk(KERN_ERR "nfsd: failed to unregister export cache\n");
1267 svcauth_unix_purge();
1270 dprintk("nfsd: export shutdown complete.\n");