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 int expkey_upcall(struct cache_detail *cd, struct cache_head *h)
72 return sunrpc_cache_pipe_upcall(cd, h, expkey_request);
75 static struct svc_expkey *svc_expkey_update(struct cache_detail *cd, struct svc_expkey *new,
76 struct svc_expkey *old);
77 static struct svc_expkey *svc_expkey_lookup(struct cache_detail *cd, struct svc_expkey *);
79 static int expkey_parse(struct cache_detail *cd, char *mesg, int mlen)
81 /* client fsidtype fsid [path] */
84 struct auth_domain *dom = NULL;
88 struct svc_expkey key;
89 struct svc_expkey *ek = NULL;
91 if (mesg[mlen - 1] != '\n')
95 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
101 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
105 dom = auth_domain_find(buf);
108 dprintk("found domain %s\n", buf);
111 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
113 fsidtype = simple_strtoul(buf, &ep, 10);
116 dprintk("found fsidtype %d\n", fsidtype);
117 if (key_len(fsidtype)==0) /* invalid type */
119 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
121 dprintk("found fsid length %d\n", len);
122 if (len != key_len(fsidtype))
125 /* OK, we seem to have a valid key */
127 key.h.expiry_time = get_expiry(&mesg);
128 if (key.h.expiry_time == 0)
132 key.ek_fsidtype = fsidtype;
133 memcpy(key.ek_fsid, buf, len);
135 ek = svc_expkey_lookup(cd, &key);
140 /* now we want a pathname, or empty meaning NEGATIVE */
142 len = qword_get(&mesg, buf, PAGE_SIZE);
145 dprintk("Path seems to be <%s>\n", buf);
148 set_bit(CACHE_NEGATIVE, &key.h.flags);
149 ek = svc_expkey_update(cd, &key, ek);
153 err = kern_path(buf, 0, &key.ek_path);
157 dprintk("Found the path %s\n", buf);
159 ek = svc_expkey_update(cd, &key, ek);
162 path_put(&key.ek_path);
167 cache_put(&ek->h, cd);
169 auth_domain_put(dom);
174 static int expkey_show(struct seq_file *m,
175 struct cache_detail *cd,
176 struct cache_head *h)
178 struct svc_expkey *ek ;
182 seq_puts(m, "#domain fsidtype fsid [path]\n");
185 ek = container_of(h, struct svc_expkey, h);
186 seq_printf(m, "%s %d 0x", ek->ek_client->name,
188 for (i=0; i < key_len(ek->ek_fsidtype)/4; i++)
189 seq_printf(m, "%08x", ek->ek_fsid[i]);
190 if (test_bit(CACHE_VALID, &h->flags) &&
191 !test_bit(CACHE_NEGATIVE, &h->flags)) {
193 seq_path(m, &ek->ek_path, "\\ \t\n");
199 static inline int expkey_match (struct cache_head *a, struct cache_head *b)
201 struct svc_expkey *orig = container_of(a, struct svc_expkey, h);
202 struct svc_expkey *new = container_of(b, struct svc_expkey, h);
204 if (orig->ek_fsidtype != new->ek_fsidtype ||
205 orig->ek_client != new->ek_client ||
206 memcmp(orig->ek_fsid, new->ek_fsid, key_len(orig->ek_fsidtype)) != 0)
211 static inline void expkey_init(struct cache_head *cnew,
212 struct cache_head *citem)
214 struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
215 struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
217 kref_get(&item->ek_client->ref);
218 new->ek_client = item->ek_client;
219 new->ek_fsidtype = item->ek_fsidtype;
221 memcpy(new->ek_fsid, item->ek_fsid, sizeof(new->ek_fsid));
224 static inline void expkey_update(struct cache_head *cnew,
225 struct cache_head *citem)
227 struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
228 struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
230 new->ek_path = item->ek_path;
231 path_get(&item->ek_path);
234 static struct cache_head *expkey_alloc(void)
236 struct svc_expkey *i = kmalloc(sizeof(*i), GFP_KERNEL);
243 static struct cache_detail svc_expkey_cache_template = {
244 .owner = THIS_MODULE,
245 .hash_size = EXPKEY_HASHMAX,
247 .cache_put = expkey_put,
248 .cache_upcall = expkey_upcall,
249 .cache_parse = expkey_parse,
250 .cache_show = expkey_show,
251 .match = expkey_match,
253 .update = expkey_update,
254 .alloc = expkey_alloc,
258 svc_expkey_hash(struct svc_expkey *item)
260 int hash = item->ek_fsidtype;
261 char * cp = (char*)item->ek_fsid;
262 int len = key_len(item->ek_fsidtype);
264 hash ^= hash_mem(cp, len, EXPKEY_HASHBITS);
265 hash ^= hash_ptr(item->ek_client, EXPKEY_HASHBITS);
266 hash &= EXPKEY_HASHMASK;
270 static struct svc_expkey *
271 svc_expkey_lookup(struct cache_detail *cd, struct svc_expkey *item)
273 struct cache_head *ch;
274 int hash = svc_expkey_hash(item);
276 ch = sunrpc_cache_lookup(cd, &item->h, hash);
278 return container_of(ch, struct svc_expkey, h);
283 static struct svc_expkey *
284 svc_expkey_update(struct cache_detail *cd, struct svc_expkey *new,
285 struct svc_expkey *old)
287 struct cache_head *ch;
288 int hash = svc_expkey_hash(new);
290 ch = sunrpc_cache_update(cd, &new->h, &old->h, hash);
292 return container_of(ch, struct svc_expkey, h);
298 #define EXPORT_HASHBITS 8
299 #define EXPORT_HASHMAX (1<< EXPORT_HASHBITS)
301 static void nfsd4_fslocs_free(struct nfsd4_fs_locations *fsloc)
305 for (i = 0; i < fsloc->locations_count; i++) {
306 kfree(fsloc->locations[i].path);
307 kfree(fsloc->locations[i].hosts);
309 kfree(fsloc->locations);
312 static void svc_export_put(struct kref *ref)
314 struct svc_export *exp = container_of(ref, struct svc_export, h.ref);
315 path_put(&exp->ex_path);
316 auth_domain_put(exp->ex_client);
317 nfsd4_fslocs_free(&exp->ex_fslocs);
322 static void svc_export_request(struct cache_detail *cd,
323 struct cache_head *h,
324 char **bpp, int *blen)
327 struct svc_export *exp = container_of(h, struct svc_export, h);
330 qword_add(bpp, blen, exp->ex_client->name);
331 pth = d_path(&exp->ex_path, *bpp, *blen);
333 /* is this correct? */
337 qword_add(bpp, blen, pth);
341 static int svc_export_upcall(struct cache_detail *cd, struct cache_head *h)
343 return sunrpc_cache_pipe_upcall(cd, h, svc_export_request);
346 static struct svc_export *svc_export_update(struct svc_export *new,
347 struct svc_export *old);
348 static struct svc_export *svc_export_lookup(struct svc_export *);
350 static int check_export(struct inode *inode, int *flags, unsigned char *uuid)
354 * We currently export only dirs, regular files, and (for v4
355 * pseudoroot) symlinks.
357 if (!S_ISDIR(inode->i_mode) &&
358 !S_ISLNK(inode->i_mode) &&
359 !S_ISREG(inode->i_mode))
363 * Mountd should never pass down a writeable V4ROOT export, but,
366 if (*flags & NFSEXP_V4ROOT)
367 *flags |= NFSEXP_READONLY;
369 /* There are two requirements on a filesystem to be exportable.
370 * 1: We must be able to identify the filesystem from a number.
371 * either a device number (so FS_REQUIRES_DEV needed)
372 * or an FSID number (so NFSEXP_FSID or ->uuid is needed).
373 * 2: We must be able to find an inode from a filehandle.
374 * This means that s_export_op must be set.
376 if (!(inode->i_sb->s_type->fs_flags & FS_REQUIRES_DEV) &&
377 !(*flags & NFSEXP_FSID) &&
379 dprintk("exp_export: export of non-dev fs without fsid\n");
383 if (!inode->i_sb->s_export_op ||
384 !inode->i_sb->s_export_op->fh_to_dentry) {
385 dprintk("exp_export: export of invalid fs type.\n");
393 #ifdef CONFIG_NFSD_V4
396 fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc)
399 int migrated, i, err;
402 err = get_uint(mesg, &fsloc->locations_count);
405 if (fsloc->locations_count > MAX_FS_LOCATIONS)
407 if (fsloc->locations_count == 0)
410 fsloc->locations = kzalloc(fsloc->locations_count
411 * sizeof(struct nfsd4_fs_location), GFP_KERNEL);
412 if (!fsloc->locations)
414 for (i=0; i < fsloc->locations_count; i++) {
415 /* colon separated host list */
417 len = qword_get(mesg, buf, PAGE_SIZE);
421 fsloc->locations[i].hosts = kstrdup(buf, GFP_KERNEL);
422 if (!fsloc->locations[i].hosts)
425 /* slash separated path component list */
426 len = qword_get(mesg, buf, PAGE_SIZE);
430 fsloc->locations[i].path = kstrdup(buf, GFP_KERNEL);
431 if (!fsloc->locations[i].path)
435 err = get_int(mesg, &migrated);
439 if (migrated < 0 || migrated > 1)
441 fsloc->migrated = migrated;
444 nfsd4_fslocs_free(fsloc);
448 static int secinfo_parse(char **mesg, char *buf, struct svc_export *exp)
451 struct exp_flavor_info *f;
453 err = get_int(mesg, &listsize);
456 if (listsize < 0 || listsize > MAX_SECINFO_LIST)
459 for (f = exp->ex_flavors; f < exp->ex_flavors + listsize; f++) {
460 err = get_uint(mesg, &f->pseudoflavor);
464 * XXX: It would be nice to also check whether this
465 * pseudoflavor is supported, so we can discover the
466 * problem at export time instead of when a client fails
469 err = get_uint(mesg, &f->flags);
472 /* Only some flags are allowed to differ between flavors: */
473 if (~NFSEXP_SECINFO_FLAGS & (f->flags ^ exp->ex_flags))
476 exp->ex_nflavors = listsize;
480 #else /* CONFIG_NFSD_V4 */
482 fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc){return 0;}
484 secinfo_parse(char **mesg, char *buf, struct svc_export *exp) { return 0; }
487 static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen)
489 /* client path expiry [flags anonuid anongid fsid] */
493 struct auth_domain *dom = NULL;
494 struct svc_export exp = {}, *expp;
497 if (mesg[mlen-1] != '\n')
501 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
507 len = qword_get(&mesg, buf, PAGE_SIZE);
512 dom = auth_domain_find(buf);
518 if ((len = qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
521 err = kern_path(buf, 0, &exp.ex_path);
530 exp.h.expiry_time = get_expiry(&mesg);
531 if (exp.h.expiry_time == 0)
535 err = get_int(&mesg, &an_int);
536 if (err == -ENOENT) {
538 set_bit(CACHE_NEGATIVE, &exp.h.flags);
540 if (err || an_int < 0)
542 exp.ex_flags= an_int;
545 err = get_int(&mesg, &an_int);
548 exp.ex_anon_uid= an_int;
551 err = get_int(&mesg, &an_int);
554 exp.ex_anon_gid= an_int;
557 err = get_int(&mesg, &an_int);
560 exp.ex_fsid = an_int;
562 while ((len = qword_get(&mesg, buf, PAGE_SIZE)) > 0) {
563 if (strcmp(buf, "fsloc") == 0)
564 err = fsloc_parse(&mesg, buf, &exp.ex_fslocs);
565 else if (strcmp(buf, "uuid") == 0) {
566 /* expect a 16 byte uuid encoded as \xXXXX... */
567 len = qword_get(&mesg, buf, PAGE_SIZE);
572 kmemdup(buf, 16, GFP_KERNEL);
573 if (exp.ex_uuid == NULL)
576 } else if (strcmp(buf, "secinfo") == 0)
577 err = secinfo_parse(&mesg, buf, &exp);
579 /* quietly ignore unknown words and anything
580 * following. Newer user-space can try to set
581 * new values, then see what the result was.
588 err = check_export(exp.ex_path.dentry->d_inode, &exp.ex_flags,
594 expp = svc_export_lookup(&exp);
596 expp = svc_export_update(&exp, expp);
605 nfsd4_fslocs_free(&exp.ex_fslocs);
608 path_put(&exp.ex_path);
610 auth_domain_put(dom);
616 static void exp_flags(struct seq_file *m, int flag, int fsid,
617 uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fslocs);
618 static void show_secinfo(struct seq_file *m, struct svc_export *exp);
620 static int svc_export_show(struct seq_file *m,
621 struct cache_detail *cd,
622 struct cache_head *h)
624 struct svc_export *exp ;
627 seq_puts(m, "#path domain(flags)\n");
630 exp = container_of(h, struct svc_export, h);
631 seq_path(m, &exp->ex_path, " \t\n\\");
633 seq_escape(m, exp->ex_client->name, " \t\n\\");
635 if (test_bit(CACHE_VALID, &h->flags) &&
636 !test_bit(CACHE_NEGATIVE, &h->flags)) {
637 exp_flags(m, exp->ex_flags, exp->ex_fsid,
638 exp->ex_anon_uid, exp->ex_anon_gid, &exp->ex_fslocs);
641 seq_puts(m, ",uuid=");
642 for (i=0; i<16; i++) {
645 seq_printf(m, "%02x", exp->ex_uuid[i]);
648 show_secinfo(m, exp);
653 static int svc_export_match(struct cache_head *a, struct cache_head *b)
655 struct svc_export *orig = container_of(a, struct svc_export, h);
656 struct svc_export *new = container_of(b, struct svc_export, h);
657 return orig->ex_client == new->ex_client &&
658 orig->ex_path.dentry == new->ex_path.dentry &&
659 orig->ex_path.mnt == new->ex_path.mnt;
662 static void svc_export_init(struct cache_head *cnew, struct cache_head *citem)
664 struct svc_export *new = container_of(cnew, struct svc_export, h);
665 struct svc_export *item = container_of(citem, struct svc_export, h);
667 kref_get(&item->ex_client->ref);
668 new->ex_client = item->ex_client;
669 new->ex_path.dentry = dget(item->ex_path.dentry);
670 new->ex_path.mnt = mntget(item->ex_path.mnt);
671 new->ex_fslocs.locations = NULL;
672 new->ex_fslocs.locations_count = 0;
673 new->ex_fslocs.migrated = 0;
678 static void export_update(struct cache_head *cnew, struct cache_head *citem)
680 struct svc_export *new = container_of(cnew, struct svc_export, h);
681 struct svc_export *item = container_of(citem, struct svc_export, h);
684 new->ex_flags = item->ex_flags;
685 new->ex_anon_uid = item->ex_anon_uid;
686 new->ex_anon_gid = item->ex_anon_gid;
687 new->ex_fsid = item->ex_fsid;
688 new->ex_uuid = item->ex_uuid;
689 item->ex_uuid = NULL;
690 new->ex_fslocs.locations = item->ex_fslocs.locations;
691 item->ex_fslocs.locations = NULL;
692 new->ex_fslocs.locations_count = item->ex_fslocs.locations_count;
693 item->ex_fslocs.locations_count = 0;
694 new->ex_fslocs.migrated = item->ex_fslocs.migrated;
695 item->ex_fslocs.migrated = 0;
696 new->ex_nflavors = item->ex_nflavors;
697 for (i = 0; i < MAX_SECINFO_LIST; i++) {
698 new->ex_flavors[i] = item->ex_flavors[i];
702 static struct cache_head *svc_export_alloc(void)
704 struct svc_export *i = kmalloc(sizeof(*i), GFP_KERNEL);
711 static struct cache_detail svc_export_cache_template = {
712 .owner = THIS_MODULE,
713 .hash_size = EXPORT_HASHMAX,
714 .name = "nfsd.export",
715 .cache_put = svc_export_put,
716 .cache_upcall = svc_export_upcall,
717 .cache_parse = svc_export_parse,
718 .cache_show = svc_export_show,
719 .match = svc_export_match,
720 .init = svc_export_init,
721 .update = export_update,
722 .alloc = svc_export_alloc,
726 svc_export_hash(struct svc_export *exp)
730 hash = hash_ptr(exp->ex_client, EXPORT_HASHBITS);
731 hash ^= hash_ptr(exp->ex_path.dentry, EXPORT_HASHBITS);
732 hash ^= hash_ptr(exp->ex_path.mnt, EXPORT_HASHBITS);
736 static struct svc_export *
737 svc_export_lookup(struct svc_export *exp)
739 struct cache_head *ch;
740 int hash = svc_export_hash(exp);
742 ch = sunrpc_cache_lookup(exp->cd, &exp->h, hash);
744 return container_of(ch, struct svc_export, h);
749 static struct svc_export *
750 svc_export_update(struct svc_export *new, struct svc_export *old)
752 struct cache_head *ch;
753 int hash = svc_export_hash(old);
755 ch = sunrpc_cache_update(old->cd, &new->h, &old->h, hash);
757 return container_of(ch, struct svc_export, h);
763 static struct svc_expkey *
764 exp_find_key(struct cache_detail *cd, svc_client *clp, int fsid_type,
765 u32 *fsidv, struct cache_req *reqp)
767 struct svc_expkey key, *ek;
771 return ERR_PTR(-ENOENT);
774 key.ek_fsidtype = fsid_type;
775 memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
777 ek = svc_expkey_lookup(cd, &key);
779 return ERR_PTR(-ENOMEM);
780 err = cache_check(cd, &ek->h, reqp);
787 static svc_export *exp_get_by_name(struct cache_detail *cd, svc_client *clp,
788 const struct path *path, struct cache_req *reqp)
790 struct svc_export *exp, key;
794 return ERR_PTR(-ENOENT);
800 exp = svc_export_lookup(&key);
802 return ERR_PTR(-ENOMEM);
803 err = cache_check(cd, &exp->h, reqp);
810 * Find the export entry for a given dentry.
812 static struct svc_export *exp_parent(struct cache_detail *cd, svc_client *clp,
815 struct dentry *saved = dget(path->dentry);
816 svc_export *exp = exp_get_by_name(cd, clp, path, NULL);
818 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) {
819 struct dentry *parent = dget_parent(path->dentry);
821 path->dentry = parent;
822 exp = exp_get_by_name(cd, clp, path, NULL);
825 path->dentry = saved;
832 * Obtain the root fh on behalf of a client.
833 * This could be done in user space, but I feel that it adds some safety
834 * since its harder to fool a kernel module than a user space program.
837 exp_rootfh(struct net *net, svc_client *clp, char *name,
838 struct knfsd_fh *f, int maxsize)
840 struct svc_export *exp;
845 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
846 struct cache_detail *cd = nn->svc_export_cache;
849 /* NB: we probably ought to check that it's NUL-terminated */
850 if (kern_path(name, 0, &path)) {
851 printk("nfsd: exp_rootfh path not found %s", name);
854 inode = path.dentry->d_inode;
856 dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n",
857 name, path.dentry, clp->name,
858 inode->i_sb->s_id, inode->i_ino);
859 exp = exp_parent(cd, clp, &path);
866 * fh must be initialized before calling fh_compose
868 fh_init(&fh, maxsize);
869 if (fh_compose(&fh, exp, path.dentry, NULL))
873 memcpy(f, &fh.fh_handle, sizeof(struct knfsd_fh));
881 static struct svc_export *exp_find(struct cache_detail *cd,
882 struct auth_domain *clp, int fsid_type,
883 u32 *fsidv, struct cache_req *reqp)
885 struct svc_export *exp;
886 struct nfsd_net *nn = net_generic(cd->net, nfsd_net_id);
887 struct svc_expkey *ek = exp_find_key(nn->svc_expkey_cache, clp, fsid_type, fsidv, reqp);
891 exp = exp_get_by_name(cd, clp, &ek->ek_path, reqp);
892 cache_put(&ek->h, nn->svc_expkey_cache);
895 return ERR_CAST(exp);
899 __be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp)
901 struct exp_flavor_info *f;
902 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
904 /* legacy gss-only clients are always OK: */
905 if (exp->ex_client == rqstp->rq_gssclient)
907 /* ip-address based client; check sec= export option: */
908 for (f = exp->ex_flavors; f < end; f++) {
909 if (f->pseudoflavor == rqstp->rq_cred.cr_flavor)
912 /* defaults in absence of sec= options: */
913 if (exp->ex_nflavors == 0) {
914 if (rqstp->rq_cred.cr_flavor == RPC_AUTH_NULL ||
915 rqstp->rq_cred.cr_flavor == RPC_AUTH_UNIX)
918 return nfserr_wrongsec;
922 * Uses rq_client and rq_gssclient to find an export; uses rq_client (an
923 * auth_unix client) if it's available and has secinfo information;
924 * otherwise, will try to use rq_gssclient.
926 * Called from functions that handle requests; functions that do work on
927 * behalf of mountd are passed a single client name to use, and should
928 * use exp_get_by_name() or exp_find().
931 rqst_exp_get_by_name(struct svc_rqst *rqstp, struct path *path)
933 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
934 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
935 struct cache_detail *cd = nn->svc_export_cache;
937 if (rqstp->rq_client == NULL)
940 /* First try the auth_unix client: */
941 exp = exp_get_by_name(cd, rqstp->rq_client, path, &rqstp->rq_chandle);
942 if (PTR_ERR(exp) == -ENOENT)
946 /* If it has secinfo, assume there are no gss/... clients */
947 if (exp->ex_nflavors > 0)
950 /* Otherwise, try falling back on gss client */
951 if (rqstp->rq_gssclient == NULL)
953 gssexp = exp_get_by_name(cd, rqstp->rq_gssclient, path, &rqstp->rq_chandle);
954 if (PTR_ERR(gssexp) == -ENOENT)
962 rqst_exp_find(struct svc_rqst *rqstp, int fsid_type, u32 *fsidv)
964 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
965 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
966 struct cache_detail *cd = nn->svc_export_cache;
968 if (rqstp->rq_client == NULL)
971 /* First try the auth_unix client: */
972 exp = exp_find(cd, rqstp->rq_client, fsid_type,
973 fsidv, &rqstp->rq_chandle);
974 if (PTR_ERR(exp) == -ENOENT)
978 /* If it has secinfo, assume there are no gss/... clients */
979 if (exp->ex_nflavors > 0)
982 /* Otherwise, try falling back on gss client */
983 if (rqstp->rq_gssclient == NULL)
985 gssexp = exp_find(cd, rqstp->rq_gssclient, fsid_type, fsidv,
987 if (PTR_ERR(gssexp) == -ENOENT)
995 rqst_exp_parent(struct svc_rqst *rqstp, struct path *path)
997 struct dentry *saved = dget(path->dentry);
998 struct svc_export *exp = rqst_exp_get_by_name(rqstp, path);
1000 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) {
1001 struct dentry *parent = dget_parent(path->dentry);
1003 path->dentry = parent;
1004 exp = rqst_exp_get_by_name(rqstp, path);
1007 path->dentry = saved;
1011 struct svc_export *rqst_find_fsidzero_export(struct svc_rqst *rqstp)
1015 mk_fsid(FSID_NUM, fsidv, 0, 0, 0, NULL);
1017 return rqst_exp_find(rqstp, FSID_NUM, fsidv);
1021 * Called when we need the filehandle for the root of the pseudofs,
1022 * for a given NFSv4 client. The root is defined to be the
1023 * export point with fsid==0
1026 exp_pseudoroot(struct svc_rqst *rqstp, struct svc_fh *fhp)
1028 struct svc_export *exp;
1031 exp = rqst_find_fsidzero_export(rqstp);
1033 return nfserrno(PTR_ERR(exp));
1034 rv = fh_compose(fhp, exp, exp->ex_path.dentry, NULL);
1041 static void *e_start(struct seq_file *m, loff_t *pos)
1042 __acquires(((struct cache_detail *)m->private)->hash_lock)
1045 unsigned hash, export;
1046 struct cache_head *ch;
1047 struct cache_detail *cd = m->private;
1048 struct cache_head **export_table = cd->hash_table;
1050 read_lock(&cd->hash_lock);
1052 return SEQ_START_TOKEN;
1054 export = n & ((1LL<<32) - 1);
1057 for (ch=export_table[hash]; ch; ch=ch->next)
1060 n &= ~((1LL<<32) - 1);
1064 } while(hash < EXPORT_HASHMAX && export_table[hash]==NULL);
1065 if (hash >= EXPORT_HASHMAX)
1068 return export_table[hash];
1071 static void *e_next(struct seq_file *m, void *p, loff_t *pos)
1073 struct cache_head *ch = p;
1074 int hash = (*pos >> 32);
1075 struct cache_detail *cd = m->private;
1076 struct cache_head **export_table = cd->hash_table;
1078 if (p == SEQ_START_TOKEN)
1080 else if (ch->next == NULL) {
1087 *pos &= ~((1LL<<32) - 1);
1088 while (hash < EXPORT_HASHMAX && export_table[hash] == NULL) {
1092 if (hash >= EXPORT_HASHMAX)
1095 return export_table[hash];
1098 static void e_stop(struct seq_file *m, void *p)
1099 __releases(((struct cache_detail *)m->private)->hash_lock)
1101 struct cache_detail *cd = m->private;
1103 read_unlock(&cd->hash_lock);
1106 static struct flags {
1110 { NFSEXP_READONLY, {"ro", "rw"}},
1111 { NFSEXP_INSECURE_PORT, {"insecure", ""}},
1112 { NFSEXP_ROOTSQUASH, {"root_squash", "no_root_squash"}},
1113 { NFSEXP_ALLSQUASH, {"all_squash", ""}},
1114 { NFSEXP_ASYNC, {"async", "sync"}},
1115 { NFSEXP_GATHERED_WRITES, {"wdelay", "no_wdelay"}},
1116 { NFSEXP_NOHIDE, {"nohide", ""}},
1117 { NFSEXP_CROSSMOUNT, {"crossmnt", ""}},
1118 { NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}},
1119 { NFSEXP_NOAUTHNLM, {"insecure_locks", ""}},
1120 { NFSEXP_V4ROOT, {"v4root", ""}},
1124 static void show_expflags(struct seq_file *m, int flags, int mask)
1127 int state, first = 0;
1129 for (flg = expflags; flg->flag; flg++) {
1130 if (flg->flag & ~mask)
1132 state = (flg->flag & flags) ? 0 : 1;
1133 if (*flg->name[state])
1134 seq_printf(m, "%s%s", first++?",":"", flg->name[state]);
1138 static void show_secinfo_flags(struct seq_file *m, int flags)
1141 show_expflags(m, flags, NFSEXP_SECINFO_FLAGS);
1144 static bool secinfo_flags_equal(int f, int g)
1146 f &= NFSEXP_SECINFO_FLAGS;
1147 g &= NFSEXP_SECINFO_FLAGS;
1151 static int show_secinfo_run(struct seq_file *m, struct exp_flavor_info **fp, struct exp_flavor_info *end)
1155 flags = (*fp)->flags;
1156 seq_printf(m, ",sec=%d", (*fp)->pseudoflavor);
1158 while (*fp != end && secinfo_flags_equal(flags, (*fp)->flags)) {
1159 seq_printf(m, ":%d", (*fp)->pseudoflavor);
1165 static void show_secinfo(struct seq_file *m, struct svc_export *exp)
1167 struct exp_flavor_info *f;
1168 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
1171 if (exp->ex_nflavors == 0)
1173 f = exp->ex_flavors;
1174 flags = show_secinfo_run(m, &f, end);
1175 if (!secinfo_flags_equal(flags, exp->ex_flags))
1176 show_secinfo_flags(m, flags);
1178 flags = show_secinfo_run(m, &f, end);
1179 show_secinfo_flags(m, flags);
1183 static void exp_flags(struct seq_file *m, int flag, int fsid,
1184 uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fsloc)
1186 show_expflags(m, flag, NFSEXP_ALLFLAGS);
1187 if (flag & NFSEXP_FSID)
1188 seq_printf(m, ",fsid=%d", fsid);
1189 if (anonu != (uid_t)-2 && anonu != (0x10000-2))
1190 seq_printf(m, ",anonuid=%u", anonu);
1191 if (anong != (gid_t)-2 && anong != (0x10000-2))
1192 seq_printf(m, ",anongid=%u", anong);
1193 if (fsloc && fsloc->locations_count > 0) {
1194 char *loctype = (fsloc->migrated) ? "refer" : "replicas";
1197 seq_printf(m, ",%s=", loctype);
1198 seq_escape(m, fsloc->locations[0].path, ",;@ \t\n\\");
1200 seq_escape(m, fsloc->locations[0].hosts, ",;@ \t\n\\");
1201 for (i = 1; i < fsloc->locations_count; i++) {
1203 seq_escape(m, fsloc->locations[i].path, ",;@ \t\n\\");
1205 seq_escape(m, fsloc->locations[i].hosts, ",;@ \t\n\\");
1210 static int e_show(struct seq_file *m, void *p)
1212 struct cache_head *cp = p;
1213 struct svc_export *exp = container_of(cp, struct svc_export, h);
1214 struct cache_detail *cd = m->private;
1216 if (p == SEQ_START_TOKEN) {
1217 seq_puts(m, "# Version 1.1\n");
1218 seq_puts(m, "# Path Client(Flags) # IPs\n");
1223 if (cache_check(cd, &exp->h, NULL))
1226 return svc_export_show(m, cd, cp);
1229 const struct seq_operations nfs_exports_op = {
1237 * Initialize the exports module.
1240 nfsd_export_init(struct net *net)
1243 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1245 dprintk("nfsd: initializing export module (net: %p).\n", net);
1247 nn->svc_export_cache = cache_create_net(&svc_export_cache_template, net);
1248 if (IS_ERR(nn->svc_export_cache))
1249 return PTR_ERR(nn->svc_export_cache);
1250 rv = cache_register_net(nn->svc_export_cache, net);
1252 goto destroy_export_cache;
1254 nn->svc_expkey_cache = cache_create_net(&svc_expkey_cache_template, net);
1255 if (IS_ERR(nn->svc_expkey_cache)) {
1256 rv = PTR_ERR(nn->svc_expkey_cache);
1257 goto unregister_export_cache;
1259 rv = cache_register_net(nn->svc_expkey_cache, net);
1261 goto destroy_expkey_cache;
1264 destroy_expkey_cache:
1265 cache_destroy_net(nn->svc_expkey_cache, net);
1266 unregister_export_cache:
1267 cache_unregister_net(nn->svc_export_cache, net);
1268 destroy_export_cache:
1269 cache_destroy_net(nn->svc_export_cache, net);
1274 * Flush exports table - called when last nfsd thread is killed
1277 nfsd_export_flush(struct net *net)
1279 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1281 cache_purge(nn->svc_expkey_cache);
1282 cache_purge(nn->svc_export_cache);
1286 * Shutdown the exports module.
1289 nfsd_export_shutdown(struct net *net)
1291 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1293 dprintk("nfsd: shutting down export module (net: %p).\n", net);
1295 cache_unregister_net(nn->svc_expkey_cache, net);
1296 cache_unregister_net(nn->svc_export_cache, net);
1297 cache_destroy_net(nn->svc_expkey_cache, net);
1298 cache_destroy_net(nn->svc_export_cache, net);
1299 svcauth_unix_purge(net);
1301 dprintk("nfsd: export shutdown complete (net: %p).\n", net);