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>
30 #include <linux/sunrpc/svc.h>
31 #include <linux/nfsd/nfsd.h>
32 #include <linux/nfsd/nfsfh.h>
33 #include <linux/nfsd/syscall.h>
34 #include <linux/lockd/bind.h>
36 #define NFSDDBG_FACILITY NFSDDBG_EXPORT
37 #define NFSD_PARANOIA 1
39 typedef struct auth_domain svc_client;
40 typedef struct svc_export svc_export;
42 static void exp_do_unexport(svc_export *unexp);
43 static int exp_verify_string(char *cp, int max);
47 * One maps client+vfsmnt+dentry to export options - the export map
48 * The other maps client+filehandle-fragment to export options. - the expkey map
50 * The export options are actually stored in the first map, and the
51 * second map contains a reference to the entry in the first map.
54 #define EXPKEY_HASHBITS 8
55 #define EXPKEY_HASHMAX (1 << EXPKEY_HASHBITS)
56 #define EXPKEY_HASHMASK (EXPKEY_HASHMAX -1)
57 static struct cache_head *expkey_table[EXPKEY_HASHMAX];
59 static inline int svc_expkey_hash(struct svc_expkey *item)
61 int hash = item->ek_fsidtype;
62 char * cp = (char*)item->ek_fsid;
63 int len = key_len(item->ek_fsidtype);
65 hash ^= hash_mem(cp, len, EXPKEY_HASHBITS);
66 hash ^= hash_ptr(item->ek_client, EXPKEY_HASHBITS);
67 return hash & EXPKEY_HASHMASK;
70 void expkey_put(struct cache_head *item, struct cache_detail *cd)
72 if (cache_put(item, cd)) {
73 struct svc_expkey *key = container_of(item, struct svc_expkey, h);
74 if (test_bit(CACHE_VALID, &item->flags) &&
75 !test_bit(CACHE_NEGATIVE, &item->flags))
76 exp_put(key->ek_export);
77 auth_domain_put(key->ek_client);
82 void expkey_request(struct cache_detail *cd,
84 char **bpp, int *blen)
86 /* client fsidtype \xfsid */
87 struct svc_expkey *ek = container_of(h, struct svc_expkey, h);
90 qword_add(bpp, blen, ek->ek_client->name);
91 snprintf(type, 5, "%d", ek->ek_fsidtype);
92 qword_add(bpp, blen, type);
93 qword_addhex(bpp, blen, (char*)ek->ek_fsid, key_len(ek->ek_fsidtype));
97 static struct svc_expkey *svc_expkey_lookup(struct svc_expkey *, int);
98 int expkey_parse(struct cache_detail *cd, char *mesg, int mlen)
100 /* client fsidtype fsid [path] */
103 struct auth_domain *dom = NULL;
107 struct svc_expkey key;
109 if (mesg[mlen-1] != '\n')
113 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
118 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
122 dom = auth_domain_find(buf);
125 dprintk("found domain %s\n", buf);
128 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
130 fsidtype = simple_strtoul(buf, &ep, 10);
133 dprintk("found fsidtype %d\n", fsidtype);
136 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
138 dprintk("found fsid length %d\n", len);
139 if (len != key_len(fsidtype))
142 /* OK, we seem to have a valid key */
144 key.h.expiry_time = get_expiry(&mesg);
145 if (key.h.expiry_time == 0)
149 key.ek_fsidtype = fsidtype;
150 memcpy(key.ek_fsid, buf, len);
152 /* now we want a pathname, or empty meaning NEGATIVE */
153 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) < 0)
155 dprintk("Path seems to be <%s>\n", buf);
158 struct svc_expkey *ek;
159 set_bit(CACHE_NEGATIVE, &key.h.flags);
160 ek = svc_expkey_lookup(&key, 1);
162 expkey_put(&ek->h, &svc_expkey_cache);
165 struct svc_expkey *ek;
166 struct svc_export *exp;
167 err = path_lookup(buf, 0, &nd);
171 dprintk("Found the path %s\n", buf);
172 exp = exp_get_by_name(dom, nd.mnt, nd.dentry, NULL);
178 dprintk("And found export\n");
180 ek = svc_expkey_lookup(&key, 1);
182 expkey_put(&ek->h, &svc_expkey_cache);
191 auth_domain_put(dom);
197 static int expkey_show(struct seq_file *m,
198 struct cache_detail *cd,
199 struct cache_head *h)
201 struct svc_expkey *ek ;
204 seq_puts(m, "#domain fsidtype fsid [path]\n");
207 ek = container_of(h, struct svc_expkey, h);
208 seq_printf(m, "%s %d 0x%08x", ek->ek_client->name,
209 ek->ek_fsidtype, ek->ek_fsid[0]);
210 if (ek->ek_fsidtype != 1)
211 seq_printf(m, "%08x", ek->ek_fsid[1]);
212 if (ek->ek_fsidtype == 2)
213 seq_printf(m, "%08x", ek->ek_fsid[2]);
214 if (test_bit(CACHE_VALID, &h->flags) &&
215 !test_bit(CACHE_NEGATIVE, &h->flags)) {
217 seq_path(m, ek->ek_export->ex_mnt, ek->ek_export->ex_dentry, "\\ \t\n");
223 struct cache_detail svc_expkey_cache = {
224 .hash_size = EXPKEY_HASHMAX,
225 .hash_table = expkey_table,
227 .cache_put = expkey_put,
228 .cache_request = expkey_request,
229 .cache_parse = expkey_parse,
230 .cache_show = expkey_show,
233 static inline int svc_expkey_match (struct svc_expkey *a, struct svc_expkey *b)
235 if (a->ek_fsidtype != b->ek_fsidtype ||
236 a->ek_client != b->ek_client ||
237 memcmp(a->ek_fsid, b->ek_fsid, key_len(a->ek_fsidtype)) != 0)
242 static inline void svc_expkey_init(struct svc_expkey *new, struct svc_expkey *item)
244 cache_get(&item->ek_client->h);
245 new->ek_client = item->ek_client;
246 new->ek_fsidtype = item->ek_fsidtype;
247 new->ek_fsid[0] = item->ek_fsid[0];
248 new->ek_fsid[1] = item->ek_fsid[1];
249 new->ek_fsid[2] = item->ek_fsid[2];
252 static inline void svc_expkey_update(struct svc_expkey *new, struct svc_expkey *item)
254 cache_get(&item->ek_export->h);
255 new->ek_export = item->ek_export;
258 static DefineSimpleCacheLookup(svc_expkey,0) /* no inplace updates */
260 #define EXPORT_HASHBITS 8
261 #define EXPORT_HASHMAX (1<< EXPORT_HASHBITS)
262 #define EXPORT_HASHMASK (EXPORT_HASHMAX -1)
264 static struct cache_head *export_table[EXPORT_HASHMAX];
266 static inline int svc_export_hash(struct svc_export *item)
270 rv = hash_ptr(item->ex_client, EXPORT_HASHBITS);
271 rv ^= hash_ptr(item->ex_dentry, EXPORT_HASHBITS);
272 rv ^= hash_ptr(item->ex_mnt, EXPORT_HASHBITS);
276 void svc_export_put(struct cache_head *item, struct cache_detail *cd)
278 if (cache_put(item, cd)) {
279 struct svc_export *exp = container_of(item, struct svc_export, h);
280 dput(exp->ex_dentry);
282 auth_domain_put(exp->ex_client);
287 void svc_export_request(struct cache_detail *cd,
288 struct cache_head *h,
289 char **bpp, int *blen)
292 struct svc_export *exp = container_of(h, struct svc_export, h);
295 qword_add(bpp, blen, exp->ex_client->name);
296 pth = d_path(exp->ex_dentry, exp->ex_mnt, *bpp, *blen);
298 /* is this correct? */
302 qword_add(bpp, blen, pth);
306 static struct svc_export *svc_export_lookup(struct svc_export *, int);
308 extern struct dentry *
309 find_exported_dentry(struct super_block *sb, void *obj, void *parent,
310 int (*acceptable)(void *context, struct dentry *de),
313 static int check_export(struct inode *inode, int flags)
316 /* We currently export only dirs and regular files.
317 * This is what umountd does.
319 if (!S_ISDIR(inode->i_mode) &&
320 !S_ISREG(inode->i_mode))
323 /* There are two requirements on a filesystem to be exportable.
324 * 1: We must be able to identify the filesystem from a number.
325 * either a device number (so FS_REQUIRES_DEV needed)
326 * or an FSID number (so NFSEXP_FSID needed).
327 * 2: We must be able to find an inode from a filehandle.
328 * This means that s_export_op must be set.
330 if (!(inode->i_sb->s_type->fs_flags & FS_REQUIRES_DEV) &&
331 !(flags & NFSEXP_FSID)) {
332 dprintk("exp_export: export of non-dev fs without fsid");
335 if (!inode->i_sb->s_export_op) {
336 dprintk("exp_export: export of invalid fs type.\n");
340 /* Ok, we can export it */;
341 if (!inode->i_sb->s_export_op->find_exported_dentry)
342 inode->i_sb->s_export_op->find_exported_dentry =
343 find_exported_dentry;
348 int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen)
350 /* client path expiry [flags anonuid anongid fsid] */
354 struct auth_domain *dom = NULL;
356 struct svc_export exp, *expp;
361 if (mesg[mlen-1] != '\n')
365 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
370 len = qword_get(&mesg, buf, PAGE_SIZE);
372 if (len <= 0) goto out;
375 dom = auth_domain_find(buf);
381 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
383 err = path_lookup(buf, 0, &nd);
389 exp.ex_dentry = nd.dentry;
393 exp.h.expiry_time = get_expiry(&mesg);
394 if (exp.h.expiry_time == 0)
398 err = get_int(&mesg, &an_int);
400 set_bit(CACHE_NEGATIVE, &exp.h.flags);
402 if (err || an_int < 0) goto out;
403 exp.ex_flags= an_int;
406 err = get_int(&mesg, &an_int);
408 exp.ex_anon_uid= an_int;
411 err = get_int(&mesg, &an_int);
413 exp.ex_anon_gid= an_int;
416 err = get_int(&mesg, &an_int);
418 exp.ex_fsid = an_int;
420 err = check_export(nd.dentry->d_inode, exp.ex_flags);
424 expp = svc_export_lookup(&exp, 1);
433 auth_domain_put(dom);
439 static void exp_flags(struct seq_file *m, int flag, int fsid, uid_t anonu, uid_t anong);
441 static int svc_export_show(struct seq_file *m,
442 struct cache_detail *cd,
443 struct cache_head *h)
445 struct svc_export *exp ;
448 seq_puts(m, "#path domain(flags)\n");
451 exp = container_of(h, struct svc_export, h);
452 seq_path(m, exp->ex_mnt, exp->ex_dentry, " \t\n\\");
454 seq_escape(m, exp->ex_client->name, " \t\n\\");
456 if (test_bit(CACHE_VALID, &h->flags) &&
457 !test_bit(CACHE_NEGATIVE, &h->flags))
458 exp_flags(m, exp->ex_flags, exp->ex_fsid,
459 exp->ex_anon_uid, exp->ex_anon_gid);
463 struct cache_detail svc_export_cache = {
464 .hash_size = EXPORT_HASHMAX,
465 .hash_table = export_table,
466 .name = "nfsd.export",
467 .cache_put = svc_export_put,
468 .cache_request = svc_export_request,
469 .cache_parse = svc_export_parse,
470 .cache_show = svc_export_show,
473 static inline int svc_export_match(struct svc_export *a, struct svc_export *b)
475 return a->ex_client == b->ex_client &&
476 a->ex_dentry == b->ex_dentry &&
477 a->ex_mnt == b->ex_mnt;
479 static inline void svc_export_init(struct svc_export *new, struct svc_export *item)
481 cache_get(&item->ex_client->h);
482 new->ex_client = item->ex_client;
483 new->ex_dentry = dget(item->ex_dentry);
484 new->ex_mnt = mntget(item->ex_mnt);
487 static inline void svc_export_update(struct svc_export *new, struct svc_export *item)
489 new->ex_flags = item->ex_flags;
490 new->ex_anon_uid = item->ex_anon_uid;
491 new->ex_anon_gid = item->ex_anon_gid;
492 new->ex_fsid = item->ex_fsid;
495 static DefineSimpleCacheLookup(svc_export,1) /* allow inplace updates */
499 exp_find_key(svc_client *clp, int fsid_type, u32 *fsidv, struct cache_req *reqp)
501 struct svc_expkey key, *ek;
508 key.ek_fsidtype = fsid_type;
509 memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
511 ek = svc_expkey_lookup(&key, 0);
513 if ((err = cache_check(&svc_expkey_cache, &ek->h, reqp))) {
514 dprintk("exp_find_key: cache_check failed: %d\n", err);
521 int exp_set_key(svc_client *clp, int fsid_type, u32 *fsidv,
522 struct svc_export *exp)
524 struct svc_expkey key, *ek;
527 key.ek_fsidtype = fsid_type;
528 memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
530 key.h.expiry_time = NEVER;
533 ek = svc_expkey_lookup(&key, 1);
535 expkey_put(&ek->h, &svc_expkey_cache);
542 * Find the client's export entry matching xdev/xino.
544 static inline struct svc_expkey *
545 exp_get_key(svc_client *clp, dev_t dev, ino_t ino)
549 if (old_valid_dev(dev)) {
550 mk_fsid_v0(fsidv, dev, ino);
551 return exp_find_key(clp, 0, fsidv, NULL);
553 mk_fsid_v3(fsidv, dev, ino);
554 return exp_find_key(clp, 3, fsidv, NULL);
558 * Find the client's export entry matching fsid
560 static inline struct svc_expkey *
561 exp_get_fsid_key(svc_client *clp, int fsid)
565 mk_fsid_v1(fsidv, fsid);
567 return exp_find_key(clp, 1, fsidv, NULL);
571 exp_get_by_name(svc_client *clp, struct vfsmount *mnt, struct dentry *dentry,
572 struct cache_req *reqp)
574 struct svc_export *exp, key;
581 key.ex_dentry = dentry;
583 exp = svc_export_lookup(&key, 0);
585 switch (cache_check(&svc_export_cache, &exp->h, reqp)) {
588 exp = ERR_PTR(-EAGAIN);
598 * Find the export entry for a given dentry.
601 exp_parent(svc_client *clp, struct vfsmount *mnt, struct dentry *dentry,
602 struct cache_req *reqp)
607 exp = exp_get_by_name(clp, mnt, dentry, reqp);
609 while (exp == NULL && !IS_ROOT(dentry)) {
610 struct dentry *parent;
612 parent = dget_parent(dentry);
615 exp = exp_get_by_name(clp, mnt, dentry, reqp);
622 * Hashtable locking. Write locks are placed only by user processes
623 * wanting to modify export information.
624 * Write locking only done in this file. Read locking
628 static DECLARE_RWSEM(hash_sem);
633 down_read(&hash_sem);
639 down_write(&hash_sem);
649 exp_writeunlock(void)
654 static void exp_fsid_unhash(struct svc_export *exp)
656 struct svc_expkey *ek;
658 if ((exp->ex_flags & NFSEXP_FSID) == 0)
661 ek = exp_get_fsid_key(exp->ex_client, exp->ex_fsid);
662 if (ek && !IS_ERR(ek)) {
663 ek->h.expiry_time = get_seconds()-1;
664 expkey_put(&ek->h, &svc_expkey_cache);
666 svc_expkey_cache.nextcheck = get_seconds();
669 static int exp_fsid_hash(svc_client *clp, struct svc_export *exp)
673 if ((exp->ex_flags & NFSEXP_FSID) == 0)
676 mk_fsid_v1(fsid, exp->ex_fsid);
677 return exp_set_key(clp, 1, fsid, exp);
680 static int exp_hash(struct auth_domain *clp, struct svc_export *exp)
683 struct inode *inode = exp->ex_dentry->d_inode;
684 dev_t dev = inode->i_sb->s_dev;
686 if (old_valid_dev(dev)) {
687 mk_fsid_v0(fsid, dev, inode->i_ino);
688 return exp_set_key(clp, 0, fsid, exp);
690 mk_fsid_v3(fsid, dev, inode->i_ino);
691 return exp_set_key(clp, 3, fsid, exp);
694 static void exp_unhash(struct svc_export *exp)
696 struct svc_expkey *ek;
697 struct inode *inode = exp->ex_dentry->d_inode;
699 ek = exp_get_key(exp->ex_client, inode->i_sb->s_dev, inode->i_ino);
700 if (ek && !IS_ERR(ek)) {
701 ek->h.expiry_time = get_seconds()-1;
702 expkey_put(&ek->h, &svc_expkey_cache);
704 svc_expkey_cache.nextcheck = get_seconds();
708 * Export a file system.
711 exp_export(struct nfsctl_export *nxp)
714 struct svc_export *exp = NULL;
715 struct svc_export new;
716 struct svc_expkey *fsid_key = NULL;
720 /* Consistency check */
722 if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) ||
723 !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX))
726 dprintk("exp_export called for %s:%s (%x/%ld fl %x).\n",
727 nxp->ex_client, nxp->ex_path,
728 (unsigned)nxp->ex_dev, (long)nxp->ex_ino,
731 /* Try to lock the export table for update */
734 /* Look up client info */
735 if (!(clp = auth_domain_find(nxp->ex_client)))
739 /* Look up the dentry */
740 err = path_lookup(nxp->ex_path, 0, &nd);
745 exp = exp_get_by_name(clp, nd.mnt, nd.dentry, NULL);
747 /* must make sure there won't be an ex_fsid clash */
748 if ((nxp->ex_flags & NFSEXP_FSID) &&
749 (fsid_key = exp_get_fsid_key(clp, nxp->ex_dev)) &&
751 fsid_key->ek_export &&
752 fsid_key->ek_export != exp)
756 /* just a flags/id/fsid update */
758 exp_fsid_unhash(exp);
759 exp->ex_flags = nxp->ex_flags;
760 exp->ex_anon_uid = nxp->ex_anon_uid;
761 exp->ex_anon_gid = nxp->ex_anon_gid;
762 exp->ex_fsid = nxp->ex_dev;
764 err = exp_fsid_hash(clp, exp);
768 err = check_export(nd.dentry->d_inode, nxp->ex_flags);
769 if (err) goto finish;
773 dprintk("nfsd: creating export entry %p for client %p\n", exp, clp);
775 new.h.expiry_time = NEVER;
779 new.ex_dentry = nd.dentry;
780 new.ex_flags = nxp->ex_flags;
781 new.ex_anon_uid = nxp->ex_anon_uid;
782 new.ex_anon_gid = nxp->ex_anon_gid;
783 new.ex_fsid = nxp->ex_dev;
785 exp = svc_export_lookup(&new, 1);
792 if (exp_hash(clp, exp) ||
793 exp_fsid_hash(clp, exp)) {
794 /* failed to create at least one index */
795 exp_do_unexport(exp);
803 if (fsid_key && !IS_ERR(fsid_key))
804 expkey_put(&fsid_key->h, &svc_expkey_cache);
806 auth_domain_put(clp);
815 * Unexport a file system. The export entry has already
816 * been removed from the client's list of exported fs's.
819 exp_do_unexport(svc_export *unexp)
821 unexp->h.expiry_time = get_seconds()-1;
822 svc_export_cache.nextcheck = get_seconds();
824 exp_fsid_unhash(unexp);
832 exp_unexport(struct nfsctl_export *nxp)
834 struct auth_domain *dom;
839 /* Consistency check */
840 if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) ||
841 !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX))
847 dom = auth_domain_find(nxp->ex_client);
849 dprintk("nfsd: unexport couldn't find %s\n", nxp->ex_client);
853 err = path_lookup(nxp->ex_path, 0, &nd);
858 exp = exp_get_by_name(dom, nd.mnt, nd.dentry, NULL);
863 exp_do_unexport(exp);
868 auth_domain_put(dom);
876 * Obtain the root fh on behalf of a client.
877 * This could be done in user space, but I feel that it adds some safety
878 * since its harder to fool a kernel module than a user space program.
881 exp_rootfh(svc_client *clp, char *path, struct knfsd_fh *f, int maxsize)
883 struct svc_export *exp;
890 /* NB: we probably ought to check that it's NUL-terminated */
891 if (path_lookup(path, 0, &nd)) {
892 printk("nfsd: exp_rootfh path not found %s", path);
895 inode = nd.dentry->d_inode;
897 dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n",
898 path, nd.dentry, clp->name,
899 inode->i_sb->s_id, inode->i_ino);
900 exp = exp_parent(clp, nd.mnt, nd.dentry, NULL);
902 dprintk("nfsd: exp_rootfh export not found.\n");
907 * fh must be initialized before calling fh_compose
909 fh_init(&fh, maxsize);
910 if (fh_compose(&fh, exp, nd.dentry, NULL))
914 memcpy(f, &fh.fh_handle, sizeof(struct knfsd_fh));
923 * Called when we need the filehandle for the root of the pseudofs,
924 * for a given NFSv4 client. The root is defined to be the
925 * export point with fsid==0
928 exp_pseudoroot(struct auth_domain *clp, struct svc_fh *fhp,
929 struct cache_req *creq)
931 struct svc_expkey *fsid_key;
935 mk_fsid_v1(fsidv, 0);
937 fsid_key = exp_find_key(clp, 1, fsidv, creq);
938 if (IS_ERR(fsid_key) && PTR_ERR(fsid_key) == -EAGAIN)
939 return nfserr_dropit;
940 if (!fsid_key || IS_ERR(fsid_key))
943 rv = fh_compose(fhp, fsid_key->ek_export,
944 fsid_key->ek_export->ex_dentry, NULL);
945 expkey_put(&fsid_key->h, &svc_expkey_cache);
951 static void *e_start(struct seq_file *m, loff_t *pos)
954 unsigned hash, export;
955 struct cache_head *ch;
958 read_lock(&svc_export_cache.hash_lock);
962 export = n & ((1LL<<32) - 1);
965 for (ch=export_table[hash]; ch; ch=ch->next)
968 n &= ~((1LL<<32) - 1);
972 } while(hash < EXPORT_HASHMAX && export_table[hash]==NULL);
973 if (hash >= EXPORT_HASHMAX)
976 return export_table[hash];
979 static void *e_next(struct seq_file *m, void *p, loff_t *pos)
981 struct cache_head *ch = p;
982 int hash = (*pos >> 32);
986 else if (ch->next == NULL) {
993 *pos &= ~((1LL<<32) - 1);
994 while (hash < EXPORT_HASHMAX && export_table[hash] == NULL) {
998 if (hash >= EXPORT_HASHMAX)
1001 return export_table[hash];
1004 static void e_stop(struct seq_file *m, void *p)
1006 read_unlock(&svc_export_cache.hash_lock);
1014 { NFSEXP_READONLY, {"ro", "rw"}},
1015 { NFSEXP_INSECURE_PORT, {"insecure", ""}},
1016 { NFSEXP_ROOTSQUASH, {"root_squash", "no_root_squash"}},
1017 { NFSEXP_ALLSQUASH, {"all_squash", ""}},
1018 { NFSEXP_ASYNC, {"async", "sync"}},
1019 { NFSEXP_GATHERED_WRITES, {"wdelay", "no_wdelay"}},
1020 { NFSEXP_NOHIDE, {"nohide", ""}},
1021 { NFSEXP_CROSSMOUNT, {"crossmnt", ""}},
1022 { NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}},
1023 { NFSEXP_NOAUTHNLM, {"insecure_locks", ""}},
1025 { NFSEXP_MSNFS, {"msnfs", ""}},
1030 static void exp_flags(struct seq_file *m, int flag, int fsid, uid_t anonu, uid_t anong)
1035 for (flg = expflags; flg->flag; flg++) {
1036 int state = (flg->flag & flag)?0:1;
1037 if (*flg->name[state])
1038 seq_printf(m, "%s%s", first++?",":"", flg->name[state]);
1040 if (flag & NFSEXP_FSID)
1041 seq_printf(m, "%sfsid=%d", first++?",":"", fsid);
1042 if (anonu != (uid_t)-2 && anonu != (0x10000-2))
1043 seq_printf(m, "%sanonuid=%d", first++?",":"", anonu);
1044 if (anong != (gid_t)-2 && anong != (0x10000-2))
1045 seq_printf(m, "%sanongid=%d", first++?",":"", anong);
1048 static int e_show(struct seq_file *m, void *p)
1050 struct cache_head *cp = p;
1051 struct svc_export *exp = container_of(cp, struct svc_export, h);
1054 if (p == (void *)1) {
1055 seq_puts(m, "# Version 1.1\n");
1056 seq_puts(m, "# Path Client(Flags) # IPs\n");
1060 clp = exp->ex_client;
1062 if (cache_check(&svc_export_cache, &exp->h, NULL))
1064 if (cache_put(&exp->h, &svc_export_cache)) BUG();
1065 return svc_export_show(m, &svc_export_cache, cp);
1068 struct seq_operations nfs_exports_op = {
1076 * Add or modify a client.
1077 * Change requests may involve the list of host addresses. The list of
1078 * exports and possibly existing uid maps are left untouched.
1081 exp_addclient(struct nfsctl_client *ncp)
1083 struct auth_domain *dom;
1086 /* First, consistency check. */
1088 if (! exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX))
1090 if (ncp->cl_naddr > NFSCLNT_ADDRMAX)
1093 /* Lock the hashtable */
1096 dom = unix_domain_find(ncp->cl_ident);
1102 /* Insert client into hashtable. */
1103 for (i = 0; i < ncp->cl_naddr; i++)
1104 auth_unix_add_addr(ncp->cl_addrlist[i], dom);
1106 auth_unix_forget_old(dom);
1107 auth_domain_put(dom);
1118 * Delete a client given an identifier.
1121 exp_delclient(struct nfsctl_client *ncp)
1124 struct auth_domain *dom;
1127 if (!exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX))
1130 /* Lock the hashtable */
1133 dom = auth_domain_find(ncp->cl_ident);
1134 /* just make sure that no addresses work
1135 * and that it will expire soon
1138 err = auth_unix_forget_old(dom);
1139 dom->h.expiry_time = get_seconds();
1140 auth_domain_put(dom);
1149 * Verify that string is non-empty and does not exceed max length.
1152 exp_verify_string(char *cp, int max)
1156 for (i = 0; i < max; i++)
1160 printk(KERN_NOTICE "nfsd: couldn't validate string %s\n", cp);
1165 * Initialize the exports module.
1168 nfsd_export_init(void)
1170 dprintk("nfsd: initializing export module.\n");
1172 cache_register(&svc_export_cache);
1173 cache_register(&svc_expkey_cache);
1178 * Flush exports table - called when last nfsd thread is killed
1181 nfsd_export_flush(void)
1184 cache_purge(&svc_expkey_cache);
1185 cache_purge(&svc_export_cache);
1190 * Shutdown the exports module.
1193 nfsd_export_shutdown(void)
1196 dprintk("nfsd: shutting down export module.\n");
1200 if (cache_unregister(&svc_expkey_cache))
1201 printk(KERN_ERR "nfsd: failed to unregister expkey cache\n");
1202 if (cache_unregister(&svc_export_cache))
1203 printk(KERN_ERR "nfsd: failed to unregister export cache\n");
1204 svcauth_unix_purge();
1207 dprintk("nfsd: export shutdown complete.\n");