2 * NFS exporting and validation.
4 * We maintain a list of clients, each of which has a list of
5 * exports. To export an fs to a given client, you first have
6 * to create the client entry with NFSCTL_ADDCLIENT, which
7 * creates a client control block and adds it to the hash
8 * table. Then, you call NFSCTL_EXPORT for each fs.
11 * Copyright (C) 1995, 1996 Olaf Kirch, <okir@monad.swb.de>
14 #include <linux/slab.h>
15 #include <linux/namei.h>
16 #include <linux/module.h>
17 #include <linux/exportfs.h>
18 #include <linux/sunrpc/svc_xprt.h>
26 #define NFSDDBG_FACILITY NFSDDBG_EXPORT
28 typedef struct auth_domain svc_client;
29 typedef struct svc_export svc_export;
33 * One maps client+vfsmnt+dentry to export options - the export map
34 * The other maps client+filehandle-fragment to export options. - the expkey map
36 * The export options are actually stored in the first map, and the
37 * second map contains a reference to the entry in the first map.
40 #define EXPKEY_HASHBITS 8
41 #define EXPKEY_HASHMAX (1 << EXPKEY_HASHBITS)
42 #define EXPKEY_HASHMASK (EXPKEY_HASHMAX -1)
44 static void expkey_put(struct kref *ref)
46 struct svc_expkey *key = container_of(ref, struct svc_expkey, h.ref);
48 if (test_bit(CACHE_VALID, &key->h.flags) &&
49 !test_bit(CACHE_NEGATIVE, &key->h.flags))
50 path_put(&key->ek_path);
51 auth_domain_put(key->ek_client);
55 static void expkey_request(struct cache_detail *cd,
57 char **bpp, int *blen)
59 /* client fsidtype \xfsid */
60 struct svc_expkey *ek = container_of(h, struct svc_expkey, h);
63 qword_add(bpp, blen, ek->ek_client->name);
64 snprintf(type, 5, "%d", ek->ek_fsidtype);
65 qword_add(bpp, blen, type);
66 qword_addhex(bpp, blen, (char*)ek->ek_fsid, key_len(ek->ek_fsidtype));
70 static struct svc_expkey *svc_expkey_update(struct cache_detail *cd, struct svc_expkey *new,
71 struct svc_expkey *old);
72 static struct svc_expkey *svc_expkey_lookup(struct cache_detail *cd, struct svc_expkey *);
74 static int expkey_parse(struct cache_detail *cd, char *mesg, int mlen)
76 /* client fsidtype fsid [path] */
79 struct auth_domain *dom = NULL;
83 struct svc_expkey key;
84 struct svc_expkey *ek = NULL;
86 if (mesg[mlen - 1] != '\n')
90 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
96 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
100 dom = auth_domain_find(buf);
103 dprintk("found domain %s\n", buf);
106 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
108 fsidtype = simple_strtoul(buf, &ep, 10);
111 dprintk("found fsidtype %d\n", fsidtype);
112 if (key_len(fsidtype)==0) /* invalid type */
114 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
116 dprintk("found fsid length %d\n", len);
117 if (len != key_len(fsidtype))
120 /* OK, we seem to have a valid key */
122 key.h.expiry_time = get_expiry(&mesg);
123 if (key.h.expiry_time == 0)
127 key.ek_fsidtype = fsidtype;
128 memcpy(key.ek_fsid, buf, len);
130 ek = svc_expkey_lookup(cd, &key);
135 /* now we want a pathname, or empty meaning NEGATIVE */
137 len = qword_get(&mesg, buf, PAGE_SIZE);
140 dprintk("Path seems to be <%s>\n", buf);
143 set_bit(CACHE_NEGATIVE, &key.h.flags);
144 ek = svc_expkey_update(cd, &key, ek);
148 err = kern_path(buf, 0, &key.ek_path);
152 dprintk("Found the path %s\n", buf);
154 ek = svc_expkey_update(cd, &key, ek);
157 path_put(&key.ek_path);
162 cache_put(&ek->h, cd);
164 auth_domain_put(dom);
169 static int expkey_show(struct seq_file *m,
170 struct cache_detail *cd,
171 struct cache_head *h)
173 struct svc_expkey *ek ;
177 seq_puts(m, "#domain fsidtype fsid [path]\n");
180 ek = container_of(h, struct svc_expkey, h);
181 seq_printf(m, "%s %d 0x", ek->ek_client->name,
183 for (i=0; i < key_len(ek->ek_fsidtype)/4; i++)
184 seq_printf(m, "%08x", ek->ek_fsid[i]);
185 if (test_bit(CACHE_VALID, &h->flags) &&
186 !test_bit(CACHE_NEGATIVE, &h->flags)) {
188 seq_path(m, &ek->ek_path, "\\ \t\n");
194 static inline int expkey_match (struct cache_head *a, struct cache_head *b)
196 struct svc_expkey *orig = container_of(a, struct svc_expkey, h);
197 struct svc_expkey *new = container_of(b, struct svc_expkey, h);
199 if (orig->ek_fsidtype != new->ek_fsidtype ||
200 orig->ek_client != new->ek_client ||
201 memcmp(orig->ek_fsid, new->ek_fsid, key_len(orig->ek_fsidtype)) != 0)
206 static inline void expkey_init(struct cache_head *cnew,
207 struct cache_head *citem)
209 struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
210 struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
212 kref_get(&item->ek_client->ref);
213 new->ek_client = item->ek_client;
214 new->ek_fsidtype = item->ek_fsidtype;
216 memcpy(new->ek_fsid, item->ek_fsid, sizeof(new->ek_fsid));
219 static inline void expkey_update(struct cache_head *cnew,
220 struct cache_head *citem)
222 struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
223 struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
225 new->ek_path = item->ek_path;
226 path_get(&item->ek_path);
229 static struct cache_head *expkey_alloc(void)
231 struct svc_expkey *i = kmalloc(sizeof(*i), GFP_KERNEL);
238 static struct cache_detail svc_expkey_cache_template = {
239 .owner = THIS_MODULE,
240 .hash_size = EXPKEY_HASHMAX,
242 .cache_put = expkey_put,
243 .cache_request = expkey_request,
244 .cache_parse = expkey_parse,
245 .cache_show = expkey_show,
246 .match = expkey_match,
248 .update = expkey_update,
249 .alloc = expkey_alloc,
253 svc_expkey_hash(struct svc_expkey *item)
255 int hash = item->ek_fsidtype;
256 char * cp = (char*)item->ek_fsid;
257 int len = key_len(item->ek_fsidtype);
259 hash ^= hash_mem(cp, len, EXPKEY_HASHBITS);
260 hash ^= hash_ptr(item->ek_client, EXPKEY_HASHBITS);
261 hash &= EXPKEY_HASHMASK;
265 static struct svc_expkey *
266 svc_expkey_lookup(struct cache_detail *cd, struct svc_expkey *item)
268 struct cache_head *ch;
269 int hash = svc_expkey_hash(item);
271 ch = sunrpc_cache_lookup(cd, &item->h, hash);
273 return container_of(ch, struct svc_expkey, h);
278 static struct svc_expkey *
279 svc_expkey_update(struct cache_detail *cd, struct svc_expkey *new,
280 struct svc_expkey *old)
282 struct cache_head *ch;
283 int hash = svc_expkey_hash(new);
285 ch = sunrpc_cache_update(cd, &new->h, &old->h, hash);
287 return container_of(ch, struct svc_expkey, h);
293 #define EXPORT_HASHBITS 8
294 #define EXPORT_HASHMAX (1<< EXPORT_HASHBITS)
296 static void nfsd4_fslocs_free(struct nfsd4_fs_locations *fsloc)
300 for (i = 0; i < fsloc->locations_count; i++) {
301 kfree(fsloc->locations[i].path);
302 kfree(fsloc->locations[i].hosts);
304 kfree(fsloc->locations);
307 static void svc_export_put(struct kref *ref)
309 struct svc_export *exp = container_of(ref, struct svc_export, h.ref);
310 path_put(&exp->ex_path);
311 auth_domain_put(exp->ex_client);
312 nfsd4_fslocs_free(&exp->ex_fslocs);
317 static void svc_export_request(struct cache_detail *cd,
318 struct cache_head *h,
319 char **bpp, int *blen)
322 struct svc_export *exp = container_of(h, struct svc_export, h);
325 qword_add(bpp, blen, exp->ex_client->name);
326 pth = d_path(&exp->ex_path, *bpp, *blen);
328 /* is this correct? */
332 qword_add(bpp, blen, pth);
336 static struct svc_export *svc_export_update(struct svc_export *new,
337 struct svc_export *old);
338 static struct svc_export *svc_export_lookup(struct svc_export *);
340 static int check_export(struct inode *inode, int *flags, unsigned char *uuid)
344 * We currently export only dirs, regular files, and (for v4
345 * pseudoroot) symlinks.
347 if (!S_ISDIR(inode->i_mode) &&
348 !S_ISLNK(inode->i_mode) &&
349 !S_ISREG(inode->i_mode))
353 * Mountd should never pass down a writeable V4ROOT export, but,
356 if (*flags & NFSEXP_V4ROOT)
357 *flags |= NFSEXP_READONLY;
359 /* There are two requirements on a filesystem to be exportable.
360 * 1: We must be able to identify the filesystem from a number.
361 * either a device number (so FS_REQUIRES_DEV needed)
362 * or an FSID number (so NFSEXP_FSID or ->uuid is needed).
363 * 2: We must be able to find an inode from a filehandle.
364 * This means that s_export_op must be set.
366 if (!(inode->i_sb->s_type->fs_flags & FS_REQUIRES_DEV) &&
367 !(*flags & NFSEXP_FSID) &&
369 dprintk("exp_export: export of non-dev fs without fsid\n");
373 if (!inode->i_sb->s_export_op ||
374 !inode->i_sb->s_export_op->fh_to_dentry) {
375 dprintk("exp_export: export of invalid fs type.\n");
383 #ifdef CONFIG_NFSD_V4
386 fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc)
389 int migrated, i, err;
392 err = get_uint(mesg, &fsloc->locations_count);
395 if (fsloc->locations_count > MAX_FS_LOCATIONS)
397 if (fsloc->locations_count == 0)
400 fsloc->locations = kzalloc(fsloc->locations_count
401 * sizeof(struct nfsd4_fs_location), GFP_KERNEL);
402 if (!fsloc->locations)
404 for (i=0; i < fsloc->locations_count; i++) {
405 /* colon separated host list */
407 len = qword_get(mesg, buf, PAGE_SIZE);
411 fsloc->locations[i].hosts = kstrdup(buf, GFP_KERNEL);
412 if (!fsloc->locations[i].hosts)
415 /* slash separated path component list */
416 len = qword_get(mesg, buf, PAGE_SIZE);
420 fsloc->locations[i].path = kstrdup(buf, GFP_KERNEL);
421 if (!fsloc->locations[i].path)
425 err = get_int(mesg, &migrated);
429 if (migrated < 0 || migrated > 1)
431 fsloc->migrated = migrated;
434 nfsd4_fslocs_free(fsloc);
438 static int secinfo_parse(char **mesg, char *buf, struct svc_export *exp)
441 struct exp_flavor_info *f;
443 err = get_int(mesg, &listsize);
446 if (listsize < 0 || listsize > MAX_SECINFO_LIST)
449 for (f = exp->ex_flavors; f < exp->ex_flavors + listsize; f++) {
450 err = get_uint(mesg, &f->pseudoflavor);
454 * XXX: It would be nice to also check whether this
455 * pseudoflavor is supported, so we can discover the
456 * problem at export time instead of when a client fails
459 err = get_uint(mesg, &f->flags);
462 /* Only some flags are allowed to differ between flavors: */
463 if (~NFSEXP_SECINFO_FLAGS & (f->flags ^ exp->ex_flags))
466 exp->ex_nflavors = listsize;
470 #else /* CONFIG_NFSD_V4 */
472 fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc){return 0;}
474 secinfo_parse(char **mesg, char *buf, struct svc_export *exp) { return 0; }
477 static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen)
479 /* client path expiry [flags anonuid anongid fsid] */
483 struct auth_domain *dom = NULL;
484 struct svc_export exp = {}, *expp;
487 if (mesg[mlen-1] != '\n')
491 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
497 len = qword_get(&mesg, buf, PAGE_SIZE);
502 dom = auth_domain_find(buf);
508 if ((len = qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
511 err = kern_path(buf, 0, &exp.ex_path);
520 exp.h.expiry_time = get_expiry(&mesg);
521 if (exp.h.expiry_time == 0)
525 err = get_int(&mesg, &an_int);
526 if (err == -ENOENT) {
528 set_bit(CACHE_NEGATIVE, &exp.h.flags);
530 if (err || an_int < 0)
532 exp.ex_flags= an_int;
535 err = get_int(&mesg, &an_int);
538 exp.ex_anon_uid= make_kuid(&init_user_ns, an_int);
541 err = get_int(&mesg, &an_int);
544 exp.ex_anon_gid= make_kgid(&init_user_ns, an_int);
547 err = get_int(&mesg, &an_int);
550 exp.ex_fsid = an_int;
552 while ((len = qword_get(&mesg, buf, PAGE_SIZE)) > 0) {
553 if (strcmp(buf, "fsloc") == 0)
554 err = fsloc_parse(&mesg, buf, &exp.ex_fslocs);
555 else if (strcmp(buf, "uuid") == 0) {
556 /* expect a 16 byte uuid encoded as \xXXXX... */
557 len = qword_get(&mesg, buf, PAGE_SIZE);
562 kmemdup(buf, 16, GFP_KERNEL);
563 if (exp.ex_uuid == NULL)
566 } else if (strcmp(buf, "secinfo") == 0)
567 err = secinfo_parse(&mesg, buf, &exp);
569 /* quietly ignore unknown words and anything
570 * following. Newer user-space can try to set
571 * new values, then see what the result was.
578 err = check_export(exp.ex_path.dentry->d_inode, &exp.ex_flags,
583 * For some reason exportfs has been passing down an
584 * invalid (-1) uid & gid on the "dummy" export which it
585 * uses to test export support. To make sure exportfs
586 * sees errors from check_export we therefore need to
587 * delay these checks till after check_export:
589 if (!uid_valid(exp.ex_anon_uid))
591 if (!gid_valid(exp.ex_anon_gid))
595 expp = svc_export_lookup(&exp);
597 expp = svc_export_update(&exp, expp);
606 nfsd4_fslocs_free(&exp.ex_fslocs);
609 path_put(&exp.ex_path);
611 auth_domain_put(dom);
617 static void exp_flags(struct seq_file *m, int flag, int fsid,
618 kuid_t anonu, kgid_t anong, struct nfsd4_fs_locations *fslocs);
619 static void show_secinfo(struct seq_file *m, struct svc_export *exp);
621 static int svc_export_show(struct seq_file *m,
622 struct cache_detail *cd,
623 struct cache_head *h)
625 struct svc_export *exp ;
628 seq_puts(m, "#path domain(flags)\n");
631 exp = container_of(h, struct svc_export, h);
632 seq_path(m, &exp->ex_path, " \t\n\\");
634 seq_escape(m, exp->ex_client->name, " \t\n\\");
636 if (test_bit(CACHE_VALID, &h->flags) &&
637 !test_bit(CACHE_NEGATIVE, &h->flags)) {
638 exp_flags(m, exp->ex_flags, exp->ex_fsid,
639 exp->ex_anon_uid, exp->ex_anon_gid, &exp->ex_fslocs);
642 seq_puts(m, ",uuid=");
643 for (i=0; i<16; i++) {
646 seq_printf(m, "%02x", exp->ex_uuid[i]);
649 show_secinfo(m, exp);
654 static int svc_export_match(struct cache_head *a, struct cache_head *b)
656 struct svc_export *orig = container_of(a, struct svc_export, h);
657 struct svc_export *new = container_of(b, struct svc_export, h);
658 return orig->ex_client == new->ex_client &&
659 orig->ex_path.dentry == new->ex_path.dentry &&
660 orig->ex_path.mnt == new->ex_path.mnt;
663 static void svc_export_init(struct cache_head *cnew, struct cache_head *citem)
665 struct svc_export *new = container_of(cnew, struct svc_export, h);
666 struct svc_export *item = container_of(citem, struct svc_export, h);
668 kref_get(&item->ex_client->ref);
669 new->ex_client = item->ex_client;
670 new->ex_path.dentry = dget(item->ex_path.dentry);
671 new->ex_path.mnt = mntget(item->ex_path.mnt);
672 new->ex_fslocs.locations = NULL;
673 new->ex_fslocs.locations_count = 0;
674 new->ex_fslocs.migrated = 0;
679 static void export_update(struct cache_head *cnew, struct cache_head *citem)
681 struct svc_export *new = container_of(cnew, struct svc_export, h);
682 struct svc_export *item = container_of(citem, struct svc_export, h);
685 new->ex_flags = item->ex_flags;
686 new->ex_anon_uid = item->ex_anon_uid;
687 new->ex_anon_gid = item->ex_anon_gid;
688 new->ex_fsid = item->ex_fsid;
689 new->ex_uuid = item->ex_uuid;
690 item->ex_uuid = NULL;
691 new->ex_fslocs.locations = item->ex_fslocs.locations;
692 item->ex_fslocs.locations = NULL;
693 new->ex_fslocs.locations_count = item->ex_fslocs.locations_count;
694 item->ex_fslocs.locations_count = 0;
695 new->ex_fslocs.migrated = item->ex_fslocs.migrated;
696 item->ex_fslocs.migrated = 0;
697 new->ex_nflavors = item->ex_nflavors;
698 for (i = 0; i < MAX_SECINFO_LIST; i++) {
699 new->ex_flavors[i] = item->ex_flavors[i];
703 static struct cache_head *svc_export_alloc(void)
705 struct svc_export *i = kmalloc(sizeof(*i), GFP_KERNEL);
712 static struct cache_detail svc_export_cache_template = {
713 .owner = THIS_MODULE,
714 .hash_size = EXPORT_HASHMAX,
715 .name = "nfsd.export",
716 .cache_put = svc_export_put,
717 .cache_request = svc_export_request,
718 .cache_parse = svc_export_parse,
719 .cache_show = svc_export_show,
720 .match = svc_export_match,
721 .init = svc_export_init,
722 .update = export_update,
723 .alloc = svc_export_alloc,
727 svc_export_hash(struct svc_export *exp)
731 hash = hash_ptr(exp->ex_client, EXPORT_HASHBITS);
732 hash ^= hash_ptr(exp->ex_path.dentry, EXPORT_HASHBITS);
733 hash ^= hash_ptr(exp->ex_path.mnt, EXPORT_HASHBITS);
737 static struct svc_export *
738 svc_export_lookup(struct svc_export *exp)
740 struct cache_head *ch;
741 int hash = svc_export_hash(exp);
743 ch = sunrpc_cache_lookup(exp->cd, &exp->h, hash);
745 return container_of(ch, struct svc_export, h);
750 static struct svc_export *
751 svc_export_update(struct svc_export *new, struct svc_export *old)
753 struct cache_head *ch;
754 int hash = svc_export_hash(old);
756 ch = sunrpc_cache_update(old->cd, &new->h, &old->h, hash);
758 return container_of(ch, struct svc_export, h);
764 static struct svc_expkey *
765 exp_find_key(struct cache_detail *cd, svc_client *clp, int fsid_type,
766 u32 *fsidv, struct cache_req *reqp)
768 struct svc_expkey key, *ek;
772 return ERR_PTR(-ENOENT);
775 key.ek_fsidtype = fsid_type;
776 memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
778 ek = svc_expkey_lookup(cd, &key);
780 return ERR_PTR(-ENOMEM);
781 err = cache_check(cd, &ek->h, reqp);
788 static svc_export *exp_get_by_name(struct cache_detail *cd, svc_client *clp,
789 const struct path *path, struct cache_req *reqp)
791 struct svc_export *exp, key;
795 return ERR_PTR(-ENOENT);
801 exp = svc_export_lookup(&key);
803 return ERR_PTR(-ENOMEM);
804 err = cache_check(cd, &exp->h, reqp);
811 * Find the export entry for a given dentry.
813 static struct svc_export *exp_parent(struct cache_detail *cd, svc_client *clp,
816 struct dentry *saved = dget(path->dentry);
817 svc_export *exp = exp_get_by_name(cd, clp, path, NULL);
819 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) {
820 struct dentry *parent = dget_parent(path->dentry);
822 path->dentry = parent;
823 exp = exp_get_by_name(cd, clp, path, NULL);
826 path->dentry = saved;
833 * Obtain the root fh on behalf of a client.
834 * This could be done in user space, but I feel that it adds some safety
835 * since its harder to fool a kernel module than a user space program.
838 exp_rootfh(struct net *net, svc_client *clp, char *name,
839 struct knfsd_fh *f, int maxsize)
841 struct svc_export *exp;
846 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
847 struct cache_detail *cd = nn->svc_export_cache;
850 /* NB: we probably ought to check that it's NUL-terminated */
851 if (kern_path(name, 0, &path)) {
852 printk("nfsd: exp_rootfh path not found %s", name);
855 inode = path.dentry->d_inode;
857 dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n",
858 name, path.dentry, clp->name,
859 inode->i_sb->s_id, inode->i_ino);
860 exp = exp_parent(cd, clp, &path);
867 * fh must be initialized before calling fh_compose
869 fh_init(&fh, maxsize);
870 if (fh_compose(&fh, exp, path.dentry, NULL))
874 memcpy(f, &fh.fh_handle, sizeof(struct knfsd_fh));
882 static struct svc_export *exp_find(struct cache_detail *cd,
883 struct auth_domain *clp, int fsid_type,
884 u32 *fsidv, struct cache_req *reqp)
886 struct svc_export *exp;
887 struct nfsd_net *nn = net_generic(cd->net, nfsd_net_id);
888 struct svc_expkey *ek = exp_find_key(nn->svc_expkey_cache, clp, fsid_type, fsidv, reqp);
892 exp = exp_get_by_name(cd, clp, &ek->ek_path, reqp);
893 cache_put(&ek->h, nn->svc_expkey_cache);
896 return ERR_CAST(exp);
900 __be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp)
902 struct exp_flavor_info *f;
903 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
905 /* legacy gss-only clients are always OK: */
906 if (exp->ex_client == rqstp->rq_gssclient)
908 /* ip-address based client; check sec= export option: */
909 for (f = exp->ex_flavors; f < end; f++) {
910 if (f->pseudoflavor == rqstp->rq_cred.cr_flavor)
913 /* defaults in absence of sec= options: */
914 if (exp->ex_nflavors == 0) {
915 if (rqstp->rq_cred.cr_flavor == RPC_AUTH_NULL ||
916 rqstp->rq_cred.cr_flavor == RPC_AUTH_UNIX)
919 return nfserr_wrongsec;
923 * Uses rq_client and rq_gssclient to find an export; uses rq_client (an
924 * auth_unix client) if it's available and has secinfo information;
925 * otherwise, will try to use rq_gssclient.
927 * Called from functions that handle requests; functions that do work on
928 * behalf of mountd are passed a single client name to use, and should
929 * use exp_get_by_name() or exp_find().
932 rqst_exp_get_by_name(struct svc_rqst *rqstp, struct path *path)
934 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
935 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
936 struct cache_detail *cd = nn->svc_export_cache;
938 if (rqstp->rq_client == NULL)
941 /* First try the auth_unix client: */
942 exp = exp_get_by_name(cd, rqstp->rq_client, path, &rqstp->rq_chandle);
943 if (PTR_ERR(exp) == -ENOENT)
947 /* If it has secinfo, assume there are no gss/... clients */
948 if (exp->ex_nflavors > 0)
951 /* Otherwise, try falling back on gss client */
952 if (rqstp->rq_gssclient == NULL)
954 gssexp = exp_get_by_name(cd, rqstp->rq_gssclient, path, &rqstp->rq_chandle);
955 if (PTR_ERR(gssexp) == -ENOENT)
963 rqst_exp_find(struct svc_rqst *rqstp, int fsid_type, u32 *fsidv)
965 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
966 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
967 struct cache_detail *cd = nn->svc_export_cache;
969 if (rqstp->rq_client == NULL)
972 /* First try the auth_unix client: */
973 exp = exp_find(cd, rqstp->rq_client, fsid_type,
974 fsidv, &rqstp->rq_chandle);
975 if (PTR_ERR(exp) == -ENOENT)
979 /* If it has secinfo, assume there are no gss/... clients */
980 if (exp->ex_nflavors > 0)
983 /* Otherwise, try falling back on gss client */
984 if (rqstp->rq_gssclient == NULL)
986 gssexp = exp_find(cd, rqstp->rq_gssclient, fsid_type, fsidv,
988 if (PTR_ERR(gssexp) == -ENOENT)
996 rqst_exp_parent(struct svc_rqst *rqstp, struct path *path)
998 struct dentry *saved = dget(path->dentry);
999 struct svc_export *exp = rqst_exp_get_by_name(rqstp, path);
1001 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) {
1002 struct dentry *parent = dget_parent(path->dentry);
1004 path->dentry = parent;
1005 exp = rqst_exp_get_by_name(rqstp, path);
1008 path->dentry = saved;
1012 struct svc_export *rqst_find_fsidzero_export(struct svc_rqst *rqstp)
1016 mk_fsid(FSID_NUM, fsidv, 0, 0, 0, NULL);
1018 return rqst_exp_find(rqstp, FSID_NUM, fsidv);
1022 * Called when we need the filehandle for the root of the pseudofs,
1023 * for a given NFSv4 client. The root is defined to be the
1024 * export point with fsid==0
1027 exp_pseudoroot(struct svc_rqst *rqstp, struct svc_fh *fhp)
1029 struct svc_export *exp;
1032 exp = rqst_find_fsidzero_export(rqstp);
1034 return nfserrno(PTR_ERR(exp));
1035 rv = fh_compose(fhp, exp, exp->ex_path.dentry, NULL);
1042 static void *e_start(struct seq_file *m, loff_t *pos)
1043 __acquires(((struct cache_detail *)m->private)->hash_lock)
1046 unsigned hash, export;
1047 struct cache_head *ch;
1048 struct cache_detail *cd = m->private;
1049 struct cache_head **export_table = cd->hash_table;
1051 read_lock(&cd->hash_lock);
1053 return SEQ_START_TOKEN;
1055 export = n & ((1LL<<32) - 1);
1058 for (ch=export_table[hash]; ch; ch=ch->next)
1061 n &= ~((1LL<<32) - 1);
1065 } while(hash < EXPORT_HASHMAX && export_table[hash]==NULL);
1066 if (hash >= EXPORT_HASHMAX)
1069 return export_table[hash];
1072 static void *e_next(struct seq_file *m, void *p, loff_t *pos)
1074 struct cache_head *ch = p;
1075 int hash = (*pos >> 32);
1076 struct cache_detail *cd = m->private;
1077 struct cache_head **export_table = cd->hash_table;
1079 if (p == SEQ_START_TOKEN)
1081 else if (ch->next == NULL) {
1088 *pos &= ~((1LL<<32) - 1);
1089 while (hash < EXPORT_HASHMAX && export_table[hash] == NULL) {
1093 if (hash >= EXPORT_HASHMAX)
1096 return export_table[hash];
1099 static void e_stop(struct seq_file *m, void *p)
1100 __releases(((struct cache_detail *)m->private)->hash_lock)
1102 struct cache_detail *cd = m->private;
1104 read_unlock(&cd->hash_lock);
1107 static struct flags {
1111 { NFSEXP_READONLY, {"ro", "rw"}},
1112 { NFSEXP_INSECURE_PORT, {"insecure", ""}},
1113 { NFSEXP_ROOTSQUASH, {"root_squash", "no_root_squash"}},
1114 { NFSEXP_ALLSQUASH, {"all_squash", ""}},
1115 { NFSEXP_ASYNC, {"async", "sync"}},
1116 { NFSEXP_GATHERED_WRITES, {"wdelay", "no_wdelay"}},
1117 { NFSEXP_NOHIDE, {"nohide", ""}},
1118 { NFSEXP_CROSSMOUNT, {"crossmnt", ""}},
1119 { NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}},
1120 { NFSEXP_NOAUTHNLM, {"insecure_locks", ""}},
1121 { NFSEXP_V4ROOT, {"v4root", ""}},
1125 static void show_expflags(struct seq_file *m, int flags, int mask)
1128 int state, first = 0;
1130 for (flg = expflags; flg->flag; flg++) {
1131 if (flg->flag & ~mask)
1133 state = (flg->flag & flags) ? 0 : 1;
1134 if (*flg->name[state])
1135 seq_printf(m, "%s%s", first++?",":"", flg->name[state]);
1139 static void show_secinfo_flags(struct seq_file *m, int flags)
1142 show_expflags(m, flags, NFSEXP_SECINFO_FLAGS);
1145 static bool secinfo_flags_equal(int f, int g)
1147 f &= NFSEXP_SECINFO_FLAGS;
1148 g &= NFSEXP_SECINFO_FLAGS;
1152 static int show_secinfo_run(struct seq_file *m, struct exp_flavor_info **fp, struct exp_flavor_info *end)
1156 flags = (*fp)->flags;
1157 seq_printf(m, ",sec=%d", (*fp)->pseudoflavor);
1159 while (*fp != end && secinfo_flags_equal(flags, (*fp)->flags)) {
1160 seq_printf(m, ":%d", (*fp)->pseudoflavor);
1166 static void show_secinfo(struct seq_file *m, struct svc_export *exp)
1168 struct exp_flavor_info *f;
1169 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
1172 if (exp->ex_nflavors == 0)
1174 f = exp->ex_flavors;
1175 flags = show_secinfo_run(m, &f, end);
1176 if (!secinfo_flags_equal(flags, exp->ex_flags))
1177 show_secinfo_flags(m, flags);
1179 flags = show_secinfo_run(m, &f, end);
1180 show_secinfo_flags(m, flags);
1184 static void exp_flags(struct seq_file *m, int flag, int fsid,
1185 kuid_t anonu, kgid_t anong, struct nfsd4_fs_locations *fsloc)
1187 show_expflags(m, flag, NFSEXP_ALLFLAGS);
1188 if (flag & NFSEXP_FSID)
1189 seq_printf(m, ",fsid=%d", fsid);
1190 if (!uid_eq(anonu, make_kuid(&init_user_ns, (uid_t)-2)) &&
1191 !uid_eq(anonu, make_kuid(&init_user_ns, 0x10000-2)))
1192 seq_printf(m, ",anonuid=%u", from_kuid(&init_user_ns, anonu));
1193 if (!gid_eq(anong, make_kgid(&init_user_ns, (gid_t)-2)) &&
1194 !gid_eq(anong, make_kgid(&init_user_ns, 0x10000-2)))
1195 seq_printf(m, ",anongid=%u", from_kgid(&init_user_ns, anong));
1196 if (fsloc && fsloc->locations_count > 0) {
1197 char *loctype = (fsloc->migrated) ? "refer" : "replicas";
1200 seq_printf(m, ",%s=", loctype);
1201 seq_escape(m, fsloc->locations[0].path, ",;@ \t\n\\");
1203 seq_escape(m, fsloc->locations[0].hosts, ",;@ \t\n\\");
1204 for (i = 1; i < fsloc->locations_count; i++) {
1206 seq_escape(m, fsloc->locations[i].path, ",;@ \t\n\\");
1208 seq_escape(m, fsloc->locations[i].hosts, ",;@ \t\n\\");
1213 static int e_show(struct seq_file *m, void *p)
1215 struct cache_head *cp = p;
1216 struct svc_export *exp = container_of(cp, struct svc_export, h);
1217 struct cache_detail *cd = m->private;
1219 if (p == SEQ_START_TOKEN) {
1220 seq_puts(m, "# Version 1.1\n");
1221 seq_puts(m, "# Path Client(Flags) # IPs\n");
1226 if (cache_check(cd, &exp->h, NULL))
1229 return svc_export_show(m, cd, cp);
1232 const struct seq_operations nfs_exports_op = {
1240 * Initialize the exports module.
1243 nfsd_export_init(struct net *net)
1246 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1248 dprintk("nfsd: initializing export module (net: %p).\n", net);
1250 nn->svc_export_cache = cache_create_net(&svc_export_cache_template, net);
1251 if (IS_ERR(nn->svc_export_cache))
1252 return PTR_ERR(nn->svc_export_cache);
1253 rv = cache_register_net(nn->svc_export_cache, net);
1255 goto destroy_export_cache;
1257 nn->svc_expkey_cache = cache_create_net(&svc_expkey_cache_template, net);
1258 if (IS_ERR(nn->svc_expkey_cache)) {
1259 rv = PTR_ERR(nn->svc_expkey_cache);
1260 goto unregister_export_cache;
1262 rv = cache_register_net(nn->svc_expkey_cache, net);
1264 goto destroy_expkey_cache;
1267 destroy_expkey_cache:
1268 cache_destroy_net(nn->svc_expkey_cache, net);
1269 unregister_export_cache:
1270 cache_unregister_net(nn->svc_export_cache, net);
1271 destroy_export_cache:
1272 cache_destroy_net(nn->svc_export_cache, net);
1277 * Flush exports table - called when last nfsd thread is killed
1280 nfsd_export_flush(struct net *net)
1282 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1284 cache_purge(nn->svc_expkey_cache);
1285 cache_purge(nn->svc_export_cache);
1289 * Shutdown the exports module.
1292 nfsd_export_shutdown(struct net *net)
1294 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1296 dprintk("nfsd: shutting down export module (net: %p).\n", net);
1298 cache_unregister_net(nn->svc_expkey_cache, net);
1299 cache_unregister_net(nn->svc_export_cache, net);
1300 cache_destroy_net(nn->svc_expkey_cache, net);
1301 cache_destroy_net(nn->svc_export_cache, net);
1302 svcauth_unix_purge(net);
1304 dprintk("nfsd: export shutdown complete (net: %p).\n", net);