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;
677 static void export_update(struct cache_head *cnew, struct cache_head *citem)
679 struct svc_export *new = container_of(cnew, struct svc_export, h);
680 struct svc_export *item = container_of(citem, struct svc_export, h);
683 new->ex_flags = item->ex_flags;
684 new->ex_anon_uid = item->ex_anon_uid;
685 new->ex_anon_gid = item->ex_anon_gid;
686 new->ex_fsid = item->ex_fsid;
687 new->ex_uuid = item->ex_uuid;
688 item->ex_uuid = NULL;
689 new->ex_fslocs.locations = item->ex_fslocs.locations;
690 item->ex_fslocs.locations = NULL;
691 new->ex_fslocs.locations_count = item->ex_fslocs.locations_count;
692 item->ex_fslocs.locations_count = 0;
693 new->ex_fslocs.migrated = item->ex_fslocs.migrated;
694 item->ex_fslocs.migrated = 0;
695 new->ex_nflavors = item->ex_nflavors;
696 for (i = 0; i < MAX_SECINFO_LIST; i++) {
697 new->ex_flavors[i] = item->ex_flavors[i];
701 static struct cache_head *svc_export_alloc(void)
703 struct svc_export *i = kmalloc(sizeof(*i), GFP_KERNEL);
710 static struct cache_detail svc_export_cache_template = {
711 .owner = THIS_MODULE,
712 .hash_size = EXPORT_HASHMAX,
713 .name = "nfsd.export",
714 .cache_put = svc_export_put,
715 .cache_upcall = svc_export_upcall,
716 .cache_parse = svc_export_parse,
717 .cache_show = svc_export_show,
718 .match = svc_export_match,
719 .init = svc_export_init,
720 .update = export_update,
721 .alloc = svc_export_alloc,
725 svc_export_hash(struct svc_export *exp)
729 hash = hash_ptr(exp->ex_client, EXPORT_HASHBITS);
730 hash ^= hash_ptr(exp->ex_path.dentry, EXPORT_HASHBITS);
731 hash ^= hash_ptr(exp->ex_path.mnt, EXPORT_HASHBITS);
735 static struct svc_export *
736 svc_export_lookup(struct svc_export *exp)
738 struct cache_head *ch;
739 int hash = svc_export_hash(exp);
741 ch = sunrpc_cache_lookup(exp->cd, &exp->h, hash);
743 return container_of(ch, struct svc_export, h);
748 static struct svc_export *
749 svc_export_update(struct svc_export *new, struct svc_export *old)
751 struct cache_head *ch;
752 int hash = svc_export_hash(old);
754 ch = sunrpc_cache_update(old->cd, &new->h, &old->h, hash);
756 return container_of(ch, struct svc_export, h);
762 static struct svc_expkey *
763 exp_find_key(struct cache_detail *cd, svc_client *clp, int fsid_type,
764 u32 *fsidv, struct cache_req *reqp)
766 struct svc_expkey key, *ek;
770 return ERR_PTR(-ENOENT);
773 key.ek_fsidtype = fsid_type;
774 memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
776 ek = svc_expkey_lookup(cd, &key);
778 return ERR_PTR(-ENOMEM);
779 err = cache_check(cd, &ek->h, reqp);
786 static svc_export *exp_get_by_name(struct cache_detail *cd, svc_client *clp,
787 const struct path *path, struct cache_req *reqp)
789 struct svc_export *exp, key;
793 return ERR_PTR(-ENOENT);
799 exp = svc_export_lookup(&key);
801 return ERR_PTR(-ENOMEM);
802 err = cache_check(cd, &exp->h, reqp);
809 * Find the export entry for a given dentry.
811 static struct svc_export *exp_parent(struct cache_detail *cd, svc_client *clp,
814 struct dentry *saved = dget(path->dentry);
815 svc_export *exp = exp_get_by_name(cd, clp, path, NULL);
817 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) {
818 struct dentry *parent = dget_parent(path->dentry);
820 path->dentry = parent;
821 exp = exp_get_by_name(cd, clp, path, NULL);
824 path->dentry = saved;
831 * Obtain the root fh on behalf of a client.
832 * This could be done in user space, but I feel that it adds some safety
833 * since its harder to fool a kernel module than a user space program.
836 exp_rootfh(struct net *net, svc_client *clp, char *name,
837 struct knfsd_fh *f, int maxsize)
839 struct svc_export *exp;
844 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
845 struct cache_detail *cd = nn->svc_export_cache;
848 /* NB: we probably ought to check that it's NUL-terminated */
849 if (kern_path(name, 0, &path)) {
850 printk("nfsd: exp_rootfh path not found %s", name);
853 inode = path.dentry->d_inode;
855 dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n",
856 name, path.dentry, clp->name,
857 inode->i_sb->s_id, inode->i_ino);
858 exp = exp_parent(cd, clp, &path);
865 * fh must be initialized before calling fh_compose
867 fh_init(&fh, maxsize);
868 if (fh_compose(&fh, exp, path.dentry, NULL))
872 memcpy(f, &fh.fh_handle, sizeof(struct knfsd_fh));
880 static struct svc_export *exp_find(struct cache_detail *cd,
881 struct auth_domain *clp, int fsid_type,
882 u32 *fsidv, struct cache_req *reqp)
884 struct svc_export *exp;
885 struct nfsd_net *nn = net_generic(cd->net, nfsd_net_id);
886 struct svc_expkey *ek = exp_find_key(nn->svc_expkey_cache, clp, fsid_type, fsidv, reqp);
890 exp = exp_get_by_name(cd, clp, &ek->ek_path, reqp);
891 cache_put(&ek->h, nn->svc_expkey_cache);
894 return ERR_CAST(exp);
898 __be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp)
900 struct exp_flavor_info *f;
901 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
903 /* legacy gss-only clients are always OK: */
904 if (exp->ex_client == rqstp->rq_gssclient)
906 /* ip-address based client; check sec= export option: */
907 for (f = exp->ex_flavors; f < end; f++) {
908 if (f->pseudoflavor == rqstp->rq_cred.cr_flavor)
911 /* defaults in absence of sec= options: */
912 if (exp->ex_nflavors == 0) {
913 if (rqstp->rq_cred.cr_flavor == RPC_AUTH_NULL ||
914 rqstp->rq_cred.cr_flavor == RPC_AUTH_UNIX)
917 return nfserr_wrongsec;
921 * Uses rq_client and rq_gssclient to find an export; uses rq_client (an
922 * auth_unix client) if it's available and has secinfo information;
923 * otherwise, will try to use rq_gssclient.
925 * Called from functions that handle requests; functions that do work on
926 * behalf of mountd are passed a single client name to use, and should
927 * use exp_get_by_name() or exp_find().
930 rqst_exp_get_by_name(struct svc_rqst *rqstp, struct path *path)
932 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
933 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
934 struct cache_detail *cd = nn->svc_export_cache;
936 if (rqstp->rq_client == NULL)
939 /* First try the auth_unix client: */
940 exp = exp_get_by_name(cd, rqstp->rq_client, path, &rqstp->rq_chandle);
941 if (PTR_ERR(exp) == -ENOENT)
945 /* If it has secinfo, assume there are no gss/... clients */
946 if (exp->ex_nflavors > 0)
949 /* Otherwise, try falling back on gss client */
950 if (rqstp->rq_gssclient == NULL)
952 gssexp = exp_get_by_name(cd, rqstp->rq_gssclient, path, &rqstp->rq_chandle);
953 if (PTR_ERR(gssexp) == -ENOENT)
961 rqst_exp_find(struct svc_rqst *rqstp, int fsid_type, u32 *fsidv)
963 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
964 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
965 struct cache_detail *cd = nn->svc_export_cache;
967 if (rqstp->rq_client == NULL)
970 /* First try the auth_unix client: */
971 exp = exp_find(cd, rqstp->rq_client, fsid_type,
972 fsidv, &rqstp->rq_chandle);
973 if (PTR_ERR(exp) == -ENOENT)
977 /* If it has secinfo, assume there are no gss/... clients */
978 if (exp->ex_nflavors > 0)
981 /* Otherwise, try falling back on gss client */
982 if (rqstp->rq_gssclient == NULL)
984 gssexp = exp_find(cd, rqstp->rq_gssclient, fsid_type, fsidv,
986 if (PTR_ERR(gssexp) == -ENOENT)
994 rqst_exp_parent(struct svc_rqst *rqstp, struct path *path)
996 struct dentry *saved = dget(path->dentry);
997 struct svc_export *exp = rqst_exp_get_by_name(rqstp, path);
999 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) {
1000 struct dentry *parent = dget_parent(path->dentry);
1002 path->dentry = parent;
1003 exp = rqst_exp_get_by_name(rqstp, path);
1006 path->dentry = saved;
1010 struct svc_export *rqst_find_fsidzero_export(struct svc_rqst *rqstp)
1014 mk_fsid(FSID_NUM, fsidv, 0, 0, 0, NULL);
1016 return rqst_exp_find(rqstp, FSID_NUM, fsidv);
1020 * Called when we need the filehandle for the root of the pseudofs,
1021 * for a given NFSv4 client. The root is defined to be the
1022 * export point with fsid==0
1025 exp_pseudoroot(struct svc_rqst *rqstp, struct svc_fh *fhp)
1027 struct svc_export *exp;
1030 exp = rqst_find_fsidzero_export(rqstp);
1032 return nfserrno(PTR_ERR(exp));
1033 rv = fh_compose(fhp, exp, exp->ex_path.dentry, NULL);
1040 static void *e_start(struct seq_file *m, loff_t *pos)
1041 __acquires(((struct cache_detail *)m->private)->hash_lock)
1044 unsigned hash, export;
1045 struct cache_head *ch;
1046 struct cache_detail *cd = m->private;
1047 struct cache_head **export_table = cd->hash_table;
1049 read_lock(&cd->hash_lock);
1051 return SEQ_START_TOKEN;
1053 export = n & ((1LL<<32) - 1);
1056 for (ch=export_table[hash]; ch; ch=ch->next)
1059 n &= ~((1LL<<32) - 1);
1063 } while(hash < EXPORT_HASHMAX && export_table[hash]==NULL);
1064 if (hash >= EXPORT_HASHMAX)
1067 return export_table[hash];
1070 static void *e_next(struct seq_file *m, void *p, loff_t *pos)
1072 struct cache_head *ch = p;
1073 int hash = (*pos >> 32);
1074 struct cache_detail *cd = m->private;
1075 struct cache_head **export_table = cd->hash_table;
1077 if (p == SEQ_START_TOKEN)
1079 else if (ch->next == NULL) {
1086 *pos &= ~((1LL<<32) - 1);
1087 while (hash < EXPORT_HASHMAX && export_table[hash] == NULL) {
1091 if (hash >= EXPORT_HASHMAX)
1094 return export_table[hash];
1097 static void e_stop(struct seq_file *m, void *p)
1098 __releases(((struct cache_detail *)m->private)->hash_lock)
1100 struct cache_detail *cd = m->private;
1102 read_unlock(&cd->hash_lock);
1105 static struct flags {
1109 { NFSEXP_READONLY, {"ro", "rw"}},
1110 { NFSEXP_INSECURE_PORT, {"insecure", ""}},
1111 { NFSEXP_ROOTSQUASH, {"root_squash", "no_root_squash"}},
1112 { NFSEXP_ALLSQUASH, {"all_squash", ""}},
1113 { NFSEXP_ASYNC, {"async", "sync"}},
1114 { NFSEXP_GATHERED_WRITES, {"wdelay", "no_wdelay"}},
1115 { NFSEXP_NOHIDE, {"nohide", ""}},
1116 { NFSEXP_CROSSMOUNT, {"crossmnt", ""}},
1117 { NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}},
1118 { NFSEXP_NOAUTHNLM, {"insecure_locks", ""}},
1119 { NFSEXP_V4ROOT, {"v4root", ""}},
1123 static void show_expflags(struct seq_file *m, int flags, int mask)
1126 int state, first = 0;
1128 for (flg = expflags; flg->flag; flg++) {
1129 if (flg->flag & ~mask)
1131 state = (flg->flag & flags) ? 0 : 1;
1132 if (*flg->name[state])
1133 seq_printf(m, "%s%s", first++?",":"", flg->name[state]);
1137 static void show_secinfo_flags(struct seq_file *m, int flags)
1140 show_expflags(m, flags, NFSEXP_SECINFO_FLAGS);
1143 static bool secinfo_flags_equal(int f, int g)
1145 f &= NFSEXP_SECINFO_FLAGS;
1146 g &= NFSEXP_SECINFO_FLAGS;
1150 static int show_secinfo_run(struct seq_file *m, struct exp_flavor_info **fp, struct exp_flavor_info *end)
1154 flags = (*fp)->flags;
1155 seq_printf(m, ",sec=%d", (*fp)->pseudoflavor);
1157 while (*fp != end && secinfo_flags_equal(flags, (*fp)->flags)) {
1158 seq_printf(m, ":%d", (*fp)->pseudoflavor);
1164 static void show_secinfo(struct seq_file *m, struct svc_export *exp)
1166 struct exp_flavor_info *f;
1167 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
1170 if (exp->ex_nflavors == 0)
1172 f = exp->ex_flavors;
1173 flags = show_secinfo_run(m, &f, end);
1174 if (!secinfo_flags_equal(flags, exp->ex_flags))
1175 show_secinfo_flags(m, flags);
1177 flags = show_secinfo_run(m, &f, end);
1178 show_secinfo_flags(m, flags);
1182 static void exp_flags(struct seq_file *m, int flag, int fsid,
1183 uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fsloc)
1185 show_expflags(m, flag, NFSEXP_ALLFLAGS);
1186 if (flag & NFSEXP_FSID)
1187 seq_printf(m, ",fsid=%d", fsid);
1188 if (anonu != (uid_t)-2 && anonu != (0x10000-2))
1189 seq_printf(m, ",anonuid=%u", anonu);
1190 if (anong != (gid_t)-2 && anong != (0x10000-2))
1191 seq_printf(m, ",anongid=%u", anong);
1192 if (fsloc && fsloc->locations_count > 0) {
1193 char *loctype = (fsloc->migrated) ? "refer" : "replicas";
1196 seq_printf(m, ",%s=", loctype);
1197 seq_escape(m, fsloc->locations[0].path, ",;@ \t\n\\");
1199 seq_escape(m, fsloc->locations[0].hosts, ",;@ \t\n\\");
1200 for (i = 1; i < fsloc->locations_count; i++) {
1202 seq_escape(m, fsloc->locations[i].path, ",;@ \t\n\\");
1204 seq_escape(m, fsloc->locations[i].hosts, ",;@ \t\n\\");
1209 static int e_show(struct seq_file *m, void *p)
1211 struct cache_head *cp = p;
1212 struct svc_export *exp = container_of(cp, struct svc_export, h);
1213 struct cache_detail *cd = m->private;
1215 if (p == SEQ_START_TOKEN) {
1216 seq_puts(m, "# Version 1.1\n");
1217 seq_puts(m, "# Path Client(Flags) # IPs\n");
1222 if (cache_check(cd, &exp->h, NULL))
1225 return svc_export_show(m, cd, cp);
1228 const struct seq_operations nfs_exports_op = {
1236 * Initialize the exports module.
1239 nfsd_export_init(struct net *net)
1242 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1244 dprintk("nfsd: initializing export module (net: %p).\n", net);
1246 nn->svc_export_cache = cache_create_net(&svc_export_cache_template, net);
1247 if (IS_ERR(nn->svc_export_cache))
1248 return PTR_ERR(nn->svc_export_cache);
1249 rv = cache_register_net(nn->svc_export_cache, net);
1251 goto destroy_export_cache;
1253 nn->svc_expkey_cache = cache_create_net(&svc_expkey_cache_template, net);
1254 if (IS_ERR(nn->svc_expkey_cache)) {
1255 rv = PTR_ERR(nn->svc_expkey_cache);
1256 goto unregister_export_cache;
1258 rv = cache_register_net(nn->svc_expkey_cache, net);
1260 goto destroy_expkey_cache;
1263 destroy_expkey_cache:
1264 cache_destroy_net(nn->svc_expkey_cache, net);
1265 unregister_export_cache:
1266 cache_unregister_net(nn->svc_export_cache, net);
1267 destroy_export_cache:
1268 cache_destroy_net(nn->svc_export_cache, net);
1273 * Flush exports table - called when last nfsd thread is killed
1276 nfsd_export_flush(struct net *net)
1278 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1280 cache_purge(nn->svc_expkey_cache);
1281 cache_purge(nn->svc_export_cache);
1285 * Shutdown the exports module.
1288 nfsd_export_shutdown(struct net *net)
1290 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1292 dprintk("nfsd: shutting down export module (net: %p).\n", net);
1294 cache_unregister_net(nn->svc_expkey_cache, net);
1295 cache_unregister_net(nn->svc_export_cache, net);
1296 cache_destroy_net(nn->svc_expkey_cache, net);
1297 cache_destroy_net(nn->svc_export_cache, net);
1298 svcauth_unix_purge(net);
1300 dprintk("nfsd: export shutdown complete (net: %p).\n", net);