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 static inline int svc_export_hash(struct svc_export *item)
265 rv = hash_ptr(item->ex_client, EXPORT_HASHBITS);
266 rv ^= hash_ptr(item->ex_dentry, EXPORT_HASHBITS);
267 rv ^= hash_ptr(item->ex_mnt, EXPORT_HASHBITS);
271 void svc_export_put(struct cache_head *item, struct cache_detail *cd)
273 if (cache_put(item, cd)) {
274 struct svc_export *exp = container_of(item, struct svc_export, h);
275 dput(exp->ex_dentry);
277 auth_domain_put(exp->ex_client);
282 static void svc_export_request(struct cache_detail *cd,
283 struct cache_head *h,
284 char **bpp, int *blen)
287 struct svc_export *exp = container_of(h, struct svc_export, h);
290 qword_add(bpp, blen, exp->ex_client->name);
291 pth = d_path(exp->ex_dentry, exp->ex_mnt, *bpp, *blen);
293 /* is this correct? */
297 qword_add(bpp, blen, pth);
301 static struct svc_export *svc_export_lookup(struct svc_export *, int);
303 static int check_export(struct inode *inode, int flags)
306 /* We currently export only dirs and regular files.
307 * This is what umountd does.
309 if (!S_ISDIR(inode->i_mode) &&
310 !S_ISREG(inode->i_mode))
313 /* There are two requirements on a filesystem to be exportable.
314 * 1: We must be able to identify the filesystem from a number.
315 * either a device number (so FS_REQUIRES_DEV needed)
316 * or an FSID number (so NFSEXP_FSID needed).
317 * 2: We must be able to find an inode from a filehandle.
318 * This means that s_export_op must be set.
320 if (!(inode->i_sb->s_type->fs_flags & FS_REQUIRES_DEV) &&
321 !(flags & NFSEXP_FSID)) {
322 dprintk("exp_export: export of non-dev fs without fsid");
325 if (!inode->i_sb->s_export_op) {
326 dprintk("exp_export: export of invalid fs type.\n");
330 /* Ok, we can export it */;
331 if (!inode->i_sb->s_export_op->find_exported_dentry)
332 inode->i_sb->s_export_op->find_exported_dentry =
333 find_exported_dentry;
338 static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen)
340 /* client path expiry [flags anonuid anongid fsid] */
344 struct auth_domain *dom = NULL;
346 struct svc_export exp, *expp;
351 if (mesg[mlen-1] != '\n')
355 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
360 len = qword_get(&mesg, buf, PAGE_SIZE);
362 if (len <= 0) goto out;
365 dom = auth_domain_find(buf);
371 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
373 err = path_lookup(buf, 0, &nd);
379 exp.ex_dentry = nd.dentry;
383 exp.h.expiry_time = get_expiry(&mesg);
384 if (exp.h.expiry_time == 0)
388 err = get_int(&mesg, &an_int);
390 set_bit(CACHE_NEGATIVE, &exp.h.flags);
392 if (err || an_int < 0) goto out;
393 exp.ex_flags= an_int;
396 err = get_int(&mesg, &an_int);
398 exp.ex_anon_uid= an_int;
401 err = get_int(&mesg, &an_int);
403 exp.ex_anon_gid= an_int;
406 err = get_int(&mesg, &an_int);
408 exp.ex_fsid = an_int;
410 err = check_export(nd.dentry->d_inode, exp.ex_flags);
414 expp = svc_export_lookup(&exp, 1);
423 auth_domain_put(dom);
428 static void exp_flags(struct seq_file *m, int flag, int fsid, uid_t anonu, uid_t anong);
430 static int svc_export_show(struct seq_file *m,
431 struct cache_detail *cd,
432 struct cache_head *h)
434 struct svc_export *exp ;
437 seq_puts(m, "#path domain(flags)\n");
440 exp = container_of(h, struct svc_export, h);
441 seq_path(m, exp->ex_mnt, exp->ex_dentry, " \t\n\\");
443 seq_escape(m, exp->ex_client->name, " \t\n\\");
445 if (test_bit(CACHE_VALID, &h->flags) &&
446 !test_bit(CACHE_NEGATIVE, &h->flags))
447 exp_flags(m, exp->ex_flags, exp->ex_fsid,
448 exp->ex_anon_uid, exp->ex_anon_gid);
452 struct cache_detail svc_export_cache = {
453 .owner = THIS_MODULE,
454 .hash_size = EXPORT_HASHMAX,
455 .hash_table = export_table,
456 .name = "nfsd.export",
457 .cache_put = svc_export_put,
458 .cache_request = svc_export_request,
459 .cache_parse = svc_export_parse,
460 .cache_show = svc_export_show,
463 static inline int svc_export_match(struct svc_export *a, struct svc_export *b)
465 return a->ex_client == b->ex_client &&
466 a->ex_dentry == b->ex_dentry &&
467 a->ex_mnt == b->ex_mnt;
469 static inline void svc_export_init(struct svc_export *new, struct svc_export *item)
471 kref_get(&item->ex_client->ref);
472 new->ex_client = item->ex_client;
473 new->ex_dentry = dget(item->ex_dentry);
474 new->ex_mnt = mntget(item->ex_mnt);
477 static inline void svc_export_update(struct svc_export *new, struct svc_export *item)
479 new->ex_flags = item->ex_flags;
480 new->ex_anon_uid = item->ex_anon_uid;
481 new->ex_anon_gid = item->ex_anon_gid;
482 new->ex_fsid = item->ex_fsid;
485 static DefineSimpleCacheLookup(svc_export, svc_export)
489 exp_find_key(svc_client *clp, int fsid_type, u32 *fsidv, struct cache_req *reqp)
491 struct svc_expkey key, *ek;
498 key.ek_fsidtype = fsid_type;
499 memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
501 ek = svc_expkey_lookup(&key, 0);
503 if ((err = cache_check(&svc_expkey_cache, &ek->h, reqp)))
508 static int exp_set_key(svc_client *clp, int fsid_type, u32 *fsidv,
509 struct svc_export *exp)
511 struct svc_expkey key, *ek;
514 key.ek_fsidtype = fsid_type;
515 memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
516 key.ek_mnt = exp->ex_mnt;
517 key.ek_dentry = exp->ex_dentry;
518 key.h.expiry_time = NEVER;
521 ek = svc_expkey_lookup(&key, 1);
523 expkey_put(&ek->h, &svc_expkey_cache);
530 * Find the client's export entry matching xdev/xino.
532 static inline struct svc_expkey *
533 exp_get_key(svc_client *clp, dev_t dev, ino_t ino)
537 if (old_valid_dev(dev)) {
538 mk_fsid_v0(fsidv, dev, ino);
539 return exp_find_key(clp, 0, fsidv, NULL);
541 mk_fsid_v3(fsidv, dev, ino);
542 return exp_find_key(clp, 3, fsidv, NULL);
546 * Find the client's export entry matching fsid
548 static inline struct svc_expkey *
549 exp_get_fsid_key(svc_client *clp, int fsid)
553 mk_fsid_v1(fsidv, fsid);
555 return exp_find_key(clp, 1, fsidv, NULL);
559 exp_get_by_name(svc_client *clp, struct vfsmount *mnt, struct dentry *dentry,
560 struct cache_req *reqp)
562 struct svc_export *exp, key;
569 key.ex_dentry = dentry;
571 exp = svc_export_lookup(&key, 0);
573 switch (cache_check(&svc_export_cache, &exp->h, reqp)) {
576 exp = ERR_PTR(-EAGAIN);
586 * Find the export entry for a given dentry.
589 exp_parent(svc_client *clp, struct vfsmount *mnt, struct dentry *dentry,
590 struct cache_req *reqp)
595 exp = exp_get_by_name(clp, mnt, dentry, reqp);
597 while (exp == NULL && !IS_ROOT(dentry)) {
598 struct dentry *parent;
600 parent = dget_parent(dentry);
603 exp = exp_get_by_name(clp, mnt, dentry, reqp);
610 * Hashtable locking. Write locks are placed only by user processes
611 * wanting to modify export information.
612 * Write locking only done in this file. Read locking
616 static DECLARE_RWSEM(hash_sem);
621 down_read(&hash_sem);
627 down_write(&hash_sem);
637 exp_writeunlock(void)
642 static void exp_fsid_unhash(struct svc_export *exp)
644 struct svc_expkey *ek;
646 if ((exp->ex_flags & NFSEXP_FSID) == 0)
649 ek = exp_get_fsid_key(exp->ex_client, exp->ex_fsid);
650 if (ek && !IS_ERR(ek)) {
651 ek->h.expiry_time = get_seconds()-1;
652 expkey_put(&ek->h, &svc_expkey_cache);
654 svc_expkey_cache.nextcheck = get_seconds();
657 static int exp_fsid_hash(svc_client *clp, struct svc_export *exp)
661 if ((exp->ex_flags & NFSEXP_FSID) == 0)
664 mk_fsid_v1(fsid, exp->ex_fsid);
665 return exp_set_key(clp, 1, fsid, exp);
668 static int exp_hash(struct auth_domain *clp, struct svc_export *exp)
671 struct inode *inode = exp->ex_dentry->d_inode;
672 dev_t dev = inode->i_sb->s_dev;
674 if (old_valid_dev(dev)) {
675 mk_fsid_v0(fsid, dev, inode->i_ino);
676 return exp_set_key(clp, 0, fsid, exp);
678 mk_fsid_v3(fsid, dev, inode->i_ino);
679 return exp_set_key(clp, 3, fsid, exp);
682 static void exp_unhash(struct svc_export *exp)
684 struct svc_expkey *ek;
685 struct inode *inode = exp->ex_dentry->d_inode;
687 ek = exp_get_key(exp->ex_client, inode->i_sb->s_dev, inode->i_ino);
688 if (ek && !IS_ERR(ek)) {
689 ek->h.expiry_time = get_seconds()-1;
690 expkey_put(&ek->h, &svc_expkey_cache);
692 svc_expkey_cache.nextcheck = get_seconds();
696 * Export a file system.
699 exp_export(struct nfsctl_export *nxp)
702 struct svc_export *exp = NULL;
703 struct svc_export new;
704 struct svc_expkey *fsid_key = NULL;
708 /* Consistency check */
710 if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) ||
711 !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX))
714 dprintk("exp_export called for %s:%s (%x/%ld fl %x).\n",
715 nxp->ex_client, nxp->ex_path,
716 (unsigned)nxp->ex_dev, (long)nxp->ex_ino,
719 /* Try to lock the export table for update */
722 /* Look up client info */
723 if (!(clp = auth_domain_find(nxp->ex_client)))
727 /* Look up the dentry */
728 err = path_lookup(nxp->ex_path, 0, &nd);
733 exp = exp_get_by_name(clp, nd.mnt, nd.dentry, NULL);
735 /* must make sure there won't be an ex_fsid clash */
736 if ((nxp->ex_flags & NFSEXP_FSID) &&
737 (fsid_key = exp_get_fsid_key(clp, nxp->ex_dev)) &&
740 (fsid_key->ek_mnt != nd.mnt || fsid_key->ek_dentry != nd.dentry) )
744 /* just a flags/id/fsid update */
746 exp_fsid_unhash(exp);
747 exp->ex_flags = nxp->ex_flags;
748 exp->ex_anon_uid = nxp->ex_anon_uid;
749 exp->ex_anon_gid = nxp->ex_anon_gid;
750 exp->ex_fsid = nxp->ex_dev;
752 err = exp_fsid_hash(clp, exp);
756 err = check_export(nd.dentry->d_inode, nxp->ex_flags);
757 if (err) goto finish;
761 dprintk("nfsd: creating export entry %p for client %p\n", exp, clp);
763 new.h.expiry_time = NEVER;
767 new.ex_dentry = nd.dentry;
768 new.ex_flags = nxp->ex_flags;
769 new.ex_anon_uid = nxp->ex_anon_uid;
770 new.ex_anon_gid = nxp->ex_anon_gid;
771 new.ex_fsid = nxp->ex_dev;
773 exp = svc_export_lookup(&new, 1);
780 if (exp_hash(clp, exp) ||
781 exp_fsid_hash(clp, exp)) {
782 /* failed to create at least one index */
783 exp_do_unexport(exp);
791 if (fsid_key && !IS_ERR(fsid_key))
792 expkey_put(&fsid_key->h, &svc_expkey_cache);
794 auth_domain_put(clp);
803 * Unexport a file system. The export entry has already
804 * been removed from the client's list of exported fs's.
807 exp_do_unexport(svc_export *unexp)
809 unexp->h.expiry_time = get_seconds()-1;
810 svc_export_cache.nextcheck = get_seconds();
812 exp_fsid_unhash(unexp);
820 exp_unexport(struct nfsctl_export *nxp)
822 struct auth_domain *dom;
827 /* Consistency check */
828 if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) ||
829 !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX))
835 dom = auth_domain_find(nxp->ex_client);
837 dprintk("nfsd: unexport couldn't find %s\n", nxp->ex_client);
841 err = path_lookup(nxp->ex_path, 0, &nd);
846 exp = exp_get_by_name(dom, nd.mnt, nd.dentry, NULL);
851 exp_do_unexport(exp);
856 auth_domain_put(dom);
864 * Obtain the root fh on behalf of a client.
865 * This could be done in user space, but I feel that it adds some safety
866 * since its harder to fool a kernel module than a user space program.
869 exp_rootfh(svc_client *clp, char *path, struct knfsd_fh *f, int maxsize)
871 struct svc_export *exp;
878 /* NB: we probably ought to check that it's NUL-terminated */
879 if (path_lookup(path, 0, &nd)) {
880 printk("nfsd: exp_rootfh path not found %s", path);
883 inode = nd.dentry->d_inode;
885 dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n",
886 path, nd.dentry, clp->name,
887 inode->i_sb->s_id, inode->i_ino);
888 exp = exp_parent(clp, nd.mnt, nd.dentry, NULL);
890 dprintk("nfsd: exp_rootfh export not found.\n");
895 * fh must be initialized before calling fh_compose
897 fh_init(&fh, maxsize);
898 if (fh_compose(&fh, exp, nd.dentry, NULL))
902 memcpy(f, &fh.fh_handle, sizeof(struct knfsd_fh));
911 exp_find(struct auth_domain *clp, int fsid_type, u32 *fsidv,
912 struct cache_req *reqp)
914 struct svc_export *exp;
915 struct svc_expkey *ek = exp_find_key(clp, fsid_type, fsidv, reqp);
916 if (!ek || IS_ERR(ek))
917 return ERR_PTR(PTR_ERR(ek));
919 exp = exp_get_by_name(clp, ek->ek_mnt, ek->ek_dentry, reqp);
920 expkey_put(&ek->h, &svc_expkey_cache);
922 if (!exp || IS_ERR(exp))
923 return ERR_PTR(PTR_ERR(exp));
929 * Called when we need the filehandle for the root of the pseudofs,
930 * for a given NFSv4 client. The root is defined to be the
931 * export point with fsid==0
934 exp_pseudoroot(struct auth_domain *clp, struct svc_fh *fhp,
935 struct cache_req *creq)
937 struct svc_expkey *fsid_key;
938 struct svc_export *exp;
942 mk_fsid_v1(fsidv, 0);
944 fsid_key = exp_find_key(clp, 1, fsidv, creq);
945 if (IS_ERR(fsid_key) && PTR_ERR(fsid_key) == -EAGAIN)
946 return nfserr_dropit;
947 if (!fsid_key || IS_ERR(fsid_key))
950 exp = exp_get_by_name(clp, fsid_key->ek_mnt, fsid_key->ek_dentry, creq);
953 else if (IS_ERR(exp))
954 rv = nfserrno(PTR_ERR(exp));
956 rv = fh_compose(fhp, exp,
957 fsid_key->ek_dentry, NULL);
958 expkey_put(&fsid_key->h, &svc_expkey_cache);
964 static void *e_start(struct seq_file *m, loff_t *pos)
967 unsigned hash, export;
968 struct cache_head *ch;
971 read_lock(&svc_export_cache.hash_lock);
975 export = n & ((1LL<<32) - 1);
978 for (ch=export_table[hash]; ch; ch=ch->next)
981 n &= ~((1LL<<32) - 1);
985 } while(hash < EXPORT_HASHMAX && export_table[hash]==NULL);
986 if (hash >= EXPORT_HASHMAX)
989 return export_table[hash];
992 static void *e_next(struct seq_file *m, void *p, loff_t *pos)
994 struct cache_head *ch = p;
995 int hash = (*pos >> 32);
999 else if (ch->next == NULL) {
1006 *pos &= ~((1LL<<32) - 1);
1007 while (hash < EXPORT_HASHMAX && export_table[hash] == NULL) {
1011 if (hash >= EXPORT_HASHMAX)
1014 return export_table[hash];
1017 static void e_stop(struct seq_file *m, void *p)
1019 read_unlock(&svc_export_cache.hash_lock);
1023 static struct flags {
1027 { NFSEXP_READONLY, {"ro", "rw"}},
1028 { NFSEXP_INSECURE_PORT, {"insecure", ""}},
1029 { NFSEXP_ROOTSQUASH, {"root_squash", "no_root_squash"}},
1030 { NFSEXP_ALLSQUASH, {"all_squash", ""}},
1031 { NFSEXP_ASYNC, {"async", "sync"}},
1032 { NFSEXP_GATHERED_WRITES, {"wdelay", "no_wdelay"}},
1033 { NFSEXP_NOHIDE, {"nohide", ""}},
1034 { NFSEXP_CROSSMOUNT, {"crossmnt", ""}},
1035 { NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}},
1036 { NFSEXP_NOAUTHNLM, {"insecure_locks", ""}},
1038 { NFSEXP_MSNFS, {"msnfs", ""}},
1043 static void exp_flags(struct seq_file *m, int flag, int fsid, uid_t anonu, uid_t anong)
1048 for (flg = expflags; flg->flag; flg++) {
1049 int state = (flg->flag & flag)?0:1;
1050 if (*flg->name[state])
1051 seq_printf(m, "%s%s", first++?",":"", flg->name[state]);
1053 if (flag & NFSEXP_FSID)
1054 seq_printf(m, "%sfsid=%d", first++?",":"", fsid);
1055 if (anonu != (uid_t)-2 && anonu != (0x10000-2))
1056 seq_printf(m, "%sanonuid=%d", first++?",":"", anonu);
1057 if (anong != (gid_t)-2 && anong != (0x10000-2))
1058 seq_printf(m, "%sanongid=%d", first++?",":"", anong);
1061 static int e_show(struct seq_file *m, void *p)
1063 struct cache_head *cp = p;
1064 struct svc_export *exp = container_of(cp, struct svc_export, h);
1067 if (p == (void *)1) {
1068 seq_puts(m, "# Version 1.1\n");
1069 seq_puts(m, "# Path Client(Flags) # IPs\n");
1073 clp = exp->ex_client;
1075 if (cache_check(&svc_export_cache, &exp->h, NULL))
1077 if (cache_put(&exp->h, &svc_export_cache)) BUG();
1078 return svc_export_show(m, &svc_export_cache, cp);
1081 struct seq_operations nfs_exports_op = {
1089 * Add or modify a client.
1090 * Change requests may involve the list of host addresses. The list of
1091 * exports and possibly existing uid maps are left untouched.
1094 exp_addclient(struct nfsctl_client *ncp)
1096 struct auth_domain *dom;
1099 /* First, consistency check. */
1101 if (! exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX))
1103 if (ncp->cl_naddr > NFSCLNT_ADDRMAX)
1106 /* Lock the hashtable */
1109 dom = unix_domain_find(ncp->cl_ident);
1115 /* Insert client into hashtable. */
1116 for (i = 0; i < ncp->cl_naddr; i++)
1117 auth_unix_add_addr(ncp->cl_addrlist[i], dom);
1119 auth_unix_forget_old(dom);
1120 auth_domain_put(dom);
1131 * Delete a client given an identifier.
1134 exp_delclient(struct nfsctl_client *ncp)
1137 struct auth_domain *dom;
1140 if (!exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX))
1143 /* Lock the hashtable */
1146 dom = auth_domain_find(ncp->cl_ident);
1147 /* just make sure that no addresses work
1148 * and that it will expire soon
1151 err = auth_unix_forget_old(dom);
1152 auth_domain_put(dom);
1161 * Verify that string is non-empty and does not exceed max length.
1164 exp_verify_string(char *cp, int max)
1168 for (i = 0; i < max; i++)
1172 printk(KERN_NOTICE "nfsd: couldn't validate string %s\n", cp);
1177 * Initialize the exports module.
1180 nfsd_export_init(void)
1182 dprintk("nfsd: initializing export module.\n");
1184 cache_register(&svc_export_cache);
1185 cache_register(&svc_expkey_cache);
1190 * Flush exports table - called when last nfsd thread is killed
1193 nfsd_export_flush(void)
1196 cache_purge(&svc_expkey_cache);
1197 cache_purge(&svc_export_cache);
1202 * Shutdown the exports module.
1205 nfsd_export_shutdown(void)
1208 dprintk("nfsd: shutting down export module.\n");
1212 if (cache_unregister(&svc_expkey_cache))
1213 printk(KERN_ERR "nfsd: failed to unregister expkey cache\n");
1214 if (cache_unregister(&svc_export_cache))
1215 printk(KERN_ERR "nfsd: failed to unregister export cache\n");
1216 svcauth_unix_purge();
1219 dprintk("nfsd: export shutdown complete.\n");