blob: b4d84b579f20cd5da76866586dfa283d64c6669a [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 * NFS exporting and validation.
3 *
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.
9 *
10 *
11 * Copyright (C) 1995, 1996 Olaf Kirch, <okir@monad.swb.de>
12 */
13
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090014#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070015#include <linux/namei.h>
Bruce Allanf35279d2005-09-06 15:17:08 -070016#include <linux/module.h>
Christoph Hellwiga5694252007-07-17 04:04:28 -070017#include <linux/exportfs.h>
Stanislav Kinsburskyb3853e02012-04-11 15:13:21 +040018#include <linux/sunrpc/svc_xprt.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070019
Boaz Harrosh9a74af22009-12-03 20:30:56 +020020#include "nfsd.h"
J. Bruce Fields1557aca2009-12-04 19:36:06 -050021#include "nfsfh.h"
Stanislav Kinsburskyb3853e02012-04-11 15:13:21 +040022#include "netns.h"
Christoph Hellwig9cf514c2014-05-05 13:11:59 +020023#include "pnfs.h"
Boaz Harrosh9a74af22009-12-03 20:30:56 +020024
Linus Torvalds1da177e2005-04-16 15:20:36 -070025#define NFSDDBG_FACILITY NFSDDBG_EXPORT
Linus Torvalds1da177e2005-04-16 15:20:36 -070026
Linus Torvalds1da177e2005-04-16 15:20:36 -070027/*
28 * We have two caches.
29 * One maps client+vfsmnt+dentry to export options - the export map
30 * The other maps client+filehandle-fragment to export options. - the expkey map
31 *
32 * The export options are actually stored in the first map, and the
33 * second map contains a reference to the entry in the first map.
34 */
35
36#define EXPKEY_HASHBITS 8
37#define EXPKEY_HASHMAX (1 << EXPKEY_HASHBITS)
38#define EXPKEY_HASHMASK (EXPKEY_HASHMAX -1)
Linus Torvalds1da177e2005-04-16 15:20:36 -070039
Adrian Bunk74cae612006-03-27 01:15:10 -080040static void expkey_put(struct kref *ref)
Linus Torvalds1da177e2005-04-16 15:20:36 -070041{
NeilBrownbaab9352006-03-27 01:15:09 -080042 struct svc_expkey *key = container_of(ref, struct svc_expkey, h.ref);
43
44 if (test_bit(CACHE_VALID, &key->h.flags) &&
Jan Bluncke83aece2008-02-14 19:38:41 -080045 !test_bit(CACHE_NEGATIVE, &key->h.flags))
46 path_put(&key->ek_path);
NeilBrownbaab9352006-03-27 01:15:09 -080047 auth_domain_put(key->ek_client);
48 kfree(key);
Linus Torvalds1da177e2005-04-16 15:20:36 -070049}
50
51static void expkey_request(struct cache_detail *cd,
52 struct cache_head *h,
53 char **bpp, int *blen)
54{
55 /* client fsidtype \xfsid */
56 struct svc_expkey *ek = container_of(h, struct svc_expkey, h);
57 char type[5];
58
59 qword_add(bpp, blen, ek->ek_client->name);
60 snprintf(type, 5, "%d", ek->ek_fsidtype);
61 qword_add(bpp, blen, type);
62 qword_addhex(bpp, blen, (char*)ek->ek_fsid, key_len(ek->ek_fsidtype));
63 (*bpp)[-1] = '\n';
64}
65
Stanislav Kinsburskyc89172e2012-03-28 19:09:50 +040066static struct svc_expkey *svc_expkey_update(struct cache_detail *cd, struct svc_expkey *new,
67 struct svc_expkey *old);
68static struct svc_expkey *svc_expkey_lookup(struct cache_detail *cd, struct svc_expkey *);
Adrian Bunk74cae612006-03-27 01:15:10 -080069
Linus Torvalds1da177e2005-04-16 15:20:36 -070070static int expkey_parse(struct cache_detail *cd, char *mesg, int mlen)
71{
Kinglong Meef0db79d2014-05-23 20:56:16 +080072 /* client fsidtype fsid expiry [path] */
Linus Torvalds1da177e2005-04-16 15:20:36 -070073 char *buf;
74 int len;
75 struct auth_domain *dom = NULL;
76 int err;
77 int fsidtype;
78 char *ep;
79 struct svc_expkey key;
J. Bruce Fields30bc4df2008-10-20 16:34:21 -040080 struct svc_expkey *ek = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -070081
Dan Carpenter34769642012-01-20 10:48:18 +030082 if (mesg[mlen - 1] != '\n')
Linus Torvalds1da177e2005-04-16 15:20:36 -070083 return -EINVAL;
84 mesg[mlen-1] = 0;
85
86 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
87 err = -ENOMEM;
J. Bruce Fields30bc4df2008-10-20 16:34:21 -040088 if (!buf)
89 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -070090
91 err = -EINVAL;
92 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
93 goto out;
94
95 err = -ENOENT;
96 dom = auth_domain_find(buf);
97 if (!dom)
98 goto out;
99 dprintk("found domain %s\n", buf);
100
101 err = -EINVAL;
102 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
103 goto out;
104 fsidtype = simple_strtoul(buf, &ep, 10);
105 if (*ep)
106 goto out;
107 dprintk("found fsidtype %d\n", fsidtype);
Frank Filz4bdff8c2006-06-30 01:56:11 -0700108 if (key_len(fsidtype)==0) /* invalid type */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109 goto out;
110 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
111 goto out;
112 dprintk("found fsid length %d\n", len);
113 if (len != key_len(fsidtype))
114 goto out;
115
116 /* OK, we seem to have a valid key */
117 key.h.flags = 0;
118 key.h.expiry_time = get_expiry(&mesg);
119 if (key.h.expiry_time == 0)
120 goto out;
121
122 key.ek_client = dom;
123 key.ek_fsidtype = fsidtype;
124 memcpy(key.ek_fsid, buf, len);
125
Stanislav Kinsburskyc89172e2012-03-28 19:09:50 +0400126 ek = svc_expkey_lookup(cd, &key);
NeilBrown8d270f7f2006-03-27 01:15:04 -0800127 err = -ENOMEM;
128 if (!ek)
129 goto out;
130
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131 /* now we want a pathname, or empty meaning NEGATIVE */
NeilBrown8d270f7f2006-03-27 01:15:04 -0800132 err = -EINVAL;
J. Bruce Fields30bc4df2008-10-20 16:34:21 -0400133 len = qword_get(&mesg, buf, PAGE_SIZE);
134 if (len < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135 goto out;
136 dprintk("Path seems to be <%s>\n", buf);
137 err = 0;
138 if (len == 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139 set_bit(CACHE_NEGATIVE, &key.h.flags);
Stanislav Kinsburskyc89172e2012-03-28 19:09:50 +0400140 ek = svc_expkey_update(cd, &key, ek);
J. Bruce Fields30bc4df2008-10-20 16:34:21 -0400141 if (!ek)
142 err = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143 } else {
Al Viroa63bb992008-08-02 01:03:36 -0400144 err = kern_path(buf, 0, &key.ek_path);
J. Bruce Fields30bc4df2008-10-20 16:34:21 -0400145 if (err)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146 goto out;
147
148 dprintk("Found the path %s\n", buf);
Jan Bluncke83aece2008-02-14 19:38:41 -0800149
Stanislav Kinsburskyc89172e2012-03-28 19:09:50 +0400150 ek = svc_expkey_update(cd, &key, ek);
J. Bruce Fields30bc4df2008-10-20 16:34:21 -0400151 if (!ek)
NeilBrown8d270f7f2006-03-27 01:15:04 -0800152 err = -ENOMEM;
Al Viroa63bb992008-08-02 01:03:36 -0400153 path_put(&key.ek_path);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154 }
155 cache_flush();
156 out:
J. Bruce Fields30bc4df2008-10-20 16:34:21 -0400157 if (ek)
Stanislav Kinsburskyd4bb527e2012-03-28 19:09:01 +0400158 cache_put(&ek->h, cd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 if (dom)
160 auth_domain_put(dom);
Jesper Juhlf99d49a2005-11-07 01:01:34 -0800161 kfree(buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162 return err;
163}
164
165static int expkey_show(struct seq_file *m,
166 struct cache_detail *cd,
167 struct cache_head *h)
168{
169 struct svc_expkey *ek ;
NeilBrownaf6a4e22007-02-14 00:33:12 -0800170 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171
172 if (h ==NULL) {
173 seq_puts(m, "#domain fsidtype fsid [path]\n");
174 return 0;
175 }
176 ek = container_of(h, struct svc_expkey, h);
NeilBrownaf6a4e22007-02-14 00:33:12 -0800177 seq_printf(m, "%s %d 0x", ek->ek_client->name,
178 ek->ek_fsidtype);
179 for (i=0; i < key_len(ek->ek_fsidtype)/4; i++)
180 seq_printf(m, "%08x", ek->ek_fsid[i]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181 if (test_bit(CACHE_VALID, &h->flags) &&
182 !test_bit(CACHE_NEGATIVE, &h->flags)) {
183 seq_printf(m, " ");
Jan Blunckc32c2f62008-02-14 19:38:43 -0800184 seq_path(m, &ek->ek_path, "\\ \t\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185 }
186 seq_printf(m, "\n");
187 return 0;
188}
NeilBrown8d270f7f2006-03-27 01:15:04 -0800189
190static inline int expkey_match (struct cache_head *a, struct cache_head *b)
191{
192 struct svc_expkey *orig = container_of(a, struct svc_expkey, h);
193 struct svc_expkey *new = container_of(b, struct svc_expkey, h);
194
195 if (orig->ek_fsidtype != new->ek_fsidtype ||
196 orig->ek_client != new->ek_client ||
197 memcmp(orig->ek_fsid, new->ek_fsid, key_len(orig->ek_fsidtype)) != 0)
198 return 0;
199 return 1;
200}
201
202static inline void expkey_init(struct cache_head *cnew,
203 struct cache_head *citem)
204{
205 struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
206 struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
207
208 kref_get(&item->ek_client->ref);
209 new->ek_client = item->ek_client;
210 new->ek_fsidtype = item->ek_fsidtype;
NeilBrownaf6a4e22007-02-14 00:33:12 -0800211
212 memcpy(new->ek_fsid, item->ek_fsid, sizeof(new->ek_fsid));
NeilBrown8d270f7f2006-03-27 01:15:04 -0800213}
214
215static inline void expkey_update(struct cache_head *cnew,
216 struct cache_head *citem)
217{
218 struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
219 struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
220
Jan Bluncke83aece2008-02-14 19:38:41 -0800221 new->ek_path = item->ek_path;
222 path_get(&item->ek_path);
NeilBrown8d270f7f2006-03-27 01:15:04 -0800223}
224
225static struct cache_head *expkey_alloc(void)
226{
227 struct svc_expkey *i = kmalloc(sizeof(*i), GFP_KERNEL);
228 if (i)
229 return &i->h;
230 else
231 return NULL;
232}
233
Stanislav Kinsburskye5f06f72012-04-11 15:13:28 +0400234static struct cache_detail svc_expkey_cache_template = {
Bruce Allanf35279d2005-09-06 15:17:08 -0700235 .owner = THIS_MODULE,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236 .hash_size = EXPKEY_HASHMAX,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237 .name = "nfsd.fh",
238 .cache_put = expkey_put,
Stanislav Kinsbursky73fb8472013-02-04 14:02:45 +0300239 .cache_request = expkey_request,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240 .cache_parse = expkey_parse,
241 .cache_show = expkey_show,
NeilBrown8d270f7f2006-03-27 01:15:04 -0800242 .match = expkey_match,
243 .init = expkey_init,
244 .update = expkey_update,
245 .alloc = expkey_alloc,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246};
247
NeilBrown61f86032010-02-03 17:31:31 +1100248static int
249svc_expkey_hash(struct svc_expkey *item)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250{
NeilBrown8d270f7f2006-03-27 01:15:04 -0800251 int hash = item->ek_fsidtype;
252 char * cp = (char*)item->ek_fsid;
253 int len = key_len(item->ek_fsidtype);
254
255 hash ^= hash_mem(cp, len, EXPKEY_HASHBITS);
256 hash ^= hash_ptr(item->ek_client, EXPKEY_HASHBITS);
257 hash &= EXPKEY_HASHMASK;
NeilBrown61f86032010-02-03 17:31:31 +1100258 return hash;
259}
260
261static struct svc_expkey *
Stanislav Kinsburskyc89172e2012-03-28 19:09:50 +0400262svc_expkey_lookup(struct cache_detail *cd, struct svc_expkey *item)
NeilBrown61f86032010-02-03 17:31:31 +1100263{
264 struct cache_head *ch;
265 int hash = svc_expkey_hash(item);
NeilBrown8d270f7f2006-03-27 01:15:04 -0800266
Stanislav Kinsburskyc89172e2012-03-28 19:09:50 +0400267 ch = sunrpc_cache_lookup(cd, &item->h, hash);
NeilBrown8d270f7f2006-03-27 01:15:04 -0800268 if (ch)
269 return container_of(ch, struct svc_expkey, h);
270 else
271 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272}
273
NeilBrown8d270f7f2006-03-27 01:15:04 -0800274static struct svc_expkey *
Stanislav Kinsburskyc89172e2012-03-28 19:09:50 +0400275svc_expkey_update(struct cache_detail *cd, struct svc_expkey *new,
276 struct svc_expkey *old)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277{
NeilBrown8d270f7f2006-03-27 01:15:04 -0800278 struct cache_head *ch;
NeilBrown61f86032010-02-03 17:31:31 +1100279 int hash = svc_expkey_hash(new);
NeilBrown8d270f7f2006-03-27 01:15:04 -0800280
Stanislav Kinsburskyc89172e2012-03-28 19:09:50 +0400281 ch = sunrpc_cache_update(cd, &new->h, &old->h, hash);
NeilBrown8d270f7f2006-03-27 01:15:04 -0800282 if (ch)
283 return container_of(ch, struct svc_expkey, h);
284 else
285 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286}
287
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288
289#define EXPORT_HASHBITS 8
290#define EXPORT_HASHMAX (1<< EXPORT_HASHBITS)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291
Manoj Naik933469192006-10-04 02:16:18 -0700292static void nfsd4_fslocs_free(struct nfsd4_fs_locations *fsloc)
293{
Kinglong Meea1f05512014-05-23 19:57:49 +0800294 struct nfsd4_fs_location *locations = fsloc->locations;
Manoj Naik933469192006-10-04 02:16:18 -0700295 int i;
296
Kinglong Meea1f05512014-05-23 19:57:49 +0800297 if (!locations)
298 return;
299
Manoj Naik933469192006-10-04 02:16:18 -0700300 for (i = 0; i < fsloc->locations_count; i++) {
Kinglong Meea1f05512014-05-23 19:57:49 +0800301 kfree(locations[i].path);
302 kfree(locations[i].hosts);
Manoj Naik933469192006-10-04 02:16:18 -0700303 }
Kinglong Meea1f05512014-05-23 19:57:49 +0800304
305 kfree(locations);
306 fsloc->locations = NULL;
Manoj Naik933469192006-10-04 02:16:18 -0700307}
308
NeilBrownbaab9352006-03-27 01:15:09 -0800309static void svc_export_put(struct kref *ref)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310{
NeilBrownbaab9352006-03-27 01:15:09 -0800311 struct svc_export *exp = container_of(ref, struct svc_export, h.ref);
Jan Blunck54775492008-02-14 19:38:39 -0800312 path_put(&exp->ex_path);
NeilBrownbaab9352006-03-27 01:15:09 -0800313 auth_domain_put(exp->ex_client);
Manoj Naik933469192006-10-04 02:16:18 -0700314 nfsd4_fslocs_free(&exp->ex_fslocs);
majianpeng885c91f2013-01-29 13:16:01 +0800315 kfree(exp->ex_uuid);
NeilBrownbaab9352006-03-27 01:15:09 -0800316 kfree(exp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317}
318
319static void svc_export_request(struct cache_detail *cd,
320 struct cache_head *h,
321 char **bpp, int *blen)
322{
323 /* client path */
324 struct svc_export *exp = container_of(h, struct svc_export, h);
325 char *pth;
326
327 qword_add(bpp, blen, exp->ex_client->name);
Jan Blunckcf28b482008-02-14 19:38:44 -0800328 pth = d_path(&exp->ex_path, *bpp, *blen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329 if (IS_ERR(pth)) {
330 /* is this correct? */
331 (*bpp)[0] = '\n';
332 return;
333 }
334 qword_add(bpp, blen, pth);
335 (*bpp)[-1] = '\n';
336}
337
Adrian Bunk74cae612006-03-27 01:15:10 -0800338static struct svc_export *svc_export_update(struct svc_export *new,
339 struct svc_export *old);
NeilBrown4f7774c2006-03-27 01:15:03 -0800340static struct svc_export *svc_export_lookup(struct svc_export *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341
J. Bruce Fields774b1472009-12-13 20:21:48 -0500342static int check_export(struct inode *inode, int *flags, unsigned char *uuid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343{
344
J. Bruce Fieldsf2ca7152009-11-12 17:26:19 -0500345 /*
346 * We currently export only dirs, regular files, and (for v4
347 * pseudoroot) symlinks.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348 */
349 if (!S_ISDIR(inode->i_mode) &&
J. Bruce Fieldsf2ca7152009-11-12 17:26:19 -0500350 !S_ISLNK(inode->i_mode) &&
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351 !S_ISREG(inode->i_mode))
352 return -ENOTDIR;
353
J. Bruce Fields774b1472009-12-13 20:21:48 -0500354 /*
355 * Mountd should never pass down a writeable V4ROOT export, but,
356 * just to make sure:
357 */
358 if (*flags & NFSEXP_V4ROOT)
359 *flags |= NFSEXP_READONLY;
360
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361 /* There are two requirements on a filesystem to be exportable.
362 * 1: We must be able to identify the filesystem from a number.
363 * either a device number (so FS_REQUIRES_DEV needed)
NeilBrownaf6a4e22007-02-14 00:33:12 -0800364 * or an FSID number (so NFSEXP_FSID or ->uuid is needed).
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365 * 2: We must be able to find an inode from a filehandle.
366 * This means that s_export_op must be set.
367 */
368 if (!(inode->i_sb->s_type->fs_flags & FS_REQUIRES_DEV) &&
J. Bruce Fields774b1472009-12-13 20:21:48 -0500369 !(*flags & NFSEXP_FSID) &&
NeilBrownaf6a4e22007-02-14 00:33:12 -0800370 uuid == NULL) {
Greg Banks3e3b4802006-10-02 02:17:41 -0700371 dprintk("exp_export: export of non-dev fs without fsid\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372 return -EINVAL;
373 }
Christoph Hellwigcfaea782007-10-21 16:42:16 -0700374
375 if (!inode->i_sb->s_export_op ||
376 !inode->i_sb->s_export_op->fh_to_dentry) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377 dprintk("exp_export: export of invalid fs type.\n");
378 return -EINVAL;
379 }
380
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381 return 0;
382
383}
384
Manoj Naik933469192006-10-04 02:16:18 -0700385#ifdef CONFIG_NFSD_V4
386
387static int
388fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc)
389{
390 int len;
391 int migrated, i, err;
392
Kinglong Meebe69da82014-05-24 11:19:57 +0800393 /* more than one fsloc */
394 if (fsloc->locations)
395 return -EINVAL;
396
Manoj Naik933469192006-10-04 02:16:18 -0700397 /* listsize */
J. Bruce Fieldsa007c4c2012-06-12 16:54:16 -0400398 err = get_uint(mesg, &fsloc->locations_count);
Manoj Naik933469192006-10-04 02:16:18 -0700399 if (err)
400 return err;
401 if (fsloc->locations_count > MAX_FS_LOCATIONS)
402 return -EINVAL;
403 if (fsloc->locations_count == 0)
404 return 0;
405
406 fsloc->locations = kzalloc(fsloc->locations_count
407 * sizeof(struct nfsd4_fs_location), GFP_KERNEL);
408 if (!fsloc->locations)
409 return -ENOMEM;
410 for (i=0; i < fsloc->locations_count; i++) {
411 /* colon separated host list */
412 err = -EINVAL;
413 len = qword_get(mesg, buf, PAGE_SIZE);
414 if (len <= 0)
415 goto out_free_all;
416 err = -ENOMEM;
417 fsloc->locations[i].hosts = kstrdup(buf, GFP_KERNEL);
418 if (!fsloc->locations[i].hosts)
419 goto out_free_all;
420 err = -EINVAL;
421 /* slash separated path component list */
422 len = qword_get(mesg, buf, PAGE_SIZE);
423 if (len <= 0)
424 goto out_free_all;
425 err = -ENOMEM;
426 fsloc->locations[i].path = kstrdup(buf, GFP_KERNEL);
427 if (!fsloc->locations[i].path)
428 goto out_free_all;
429 }
430 /* migrated */
431 err = get_int(mesg, &migrated);
432 if (err)
433 goto out_free_all;
434 err = -EINVAL;
435 if (migrated < 0 || migrated > 1)
436 goto out_free_all;
437 fsloc->migrated = migrated;
438 return 0;
439out_free_all:
440 nfsd4_fslocs_free(fsloc);
441 return err;
442}
443
Andy Adamsone677bfe2007-07-17 04:04:42 -0700444static int secinfo_parse(char **mesg, char *buf, struct svc_export *exp)
445{
Andy Adamsone677bfe2007-07-17 04:04:42 -0700446 struct exp_flavor_info *f;
Kinglong Mee1f531462014-05-24 11:26:49 +0800447 u32 listsize;
448 int err;
Andy Adamsone677bfe2007-07-17 04:04:42 -0700449
Kinglong Meebe69da82014-05-24 11:19:57 +0800450 /* more than one secinfo */
451 if (exp->ex_nflavors)
452 return -EINVAL;
453
Kinglong Mee1f531462014-05-24 11:26:49 +0800454 err = get_uint(mesg, &listsize);
Andy Adamsone677bfe2007-07-17 04:04:42 -0700455 if (err)
456 return err;
Kinglong Mee1f531462014-05-24 11:26:49 +0800457 if (listsize > MAX_SECINFO_LIST)
Andy Adamsone677bfe2007-07-17 04:04:42 -0700458 return -EINVAL;
459
460 for (f = exp->ex_flavors; f < exp->ex_flavors + listsize; f++) {
J. Bruce Fieldsa007c4c2012-06-12 16:54:16 -0400461 err = get_uint(mesg, &f->pseudoflavor);
Andy Adamsone677bfe2007-07-17 04:04:42 -0700462 if (err)
463 return err;
464 /*
Roel Kluin80492e72009-04-21 16:08:39 +0200465 * XXX: It would be nice to also check whether this
466 * pseudoflavor is supported, so we can discover the
467 * problem at export time instead of when a client fails
468 * to authenticate.
Andy Adamsone677bfe2007-07-17 04:04:42 -0700469 */
J. Bruce Fieldsa007c4c2012-06-12 16:54:16 -0400470 err = get_uint(mesg, &f->flags);
Andy Adamsone677bfe2007-07-17 04:04:42 -0700471 if (err)
472 return err;
473 /* Only some flags are allowed to differ between flavors: */
474 if (~NFSEXP_SECINFO_FLAGS & (f->flags ^ exp->ex_flags))
475 return -EINVAL;
476 }
477 exp->ex_nflavors = listsize;
478 return 0;
479}
480
Manoj Naik933469192006-10-04 02:16:18 -0700481#else /* CONFIG_NFSD_V4 */
Andy Adamsone677bfe2007-07-17 04:04:42 -0700482static inline int
483fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc){return 0;}
484static inline int
485secinfo_parse(char **mesg, char *buf, struct svc_export *exp) { return 0; }
Manoj Naik933469192006-10-04 02:16:18 -0700486#endif
487
Kinglong Mee0d637902014-05-23 19:59:06 +0800488static inline int
489uuid_parse(char **mesg, char *buf, unsigned char **puuid)
490{
491 int len;
492
Kinglong Meebe69da82014-05-24 11:19:57 +0800493 /* more than one uuid */
494 if (*puuid)
495 return -EINVAL;
496
Kinglong Mee0d637902014-05-23 19:59:06 +0800497 /* expect a 16 byte uuid encoded as \xXXXX... */
498 len = qword_get(mesg, buf, PAGE_SIZE);
Kinglong Mee94eb3682014-05-23 20:00:19 +0800499 if (len != EX_UUID_LEN)
Kinglong Mee0d637902014-05-23 19:59:06 +0800500 return -EINVAL;
501
Kinglong Mee94eb3682014-05-23 20:00:19 +0800502 *puuid = kmemdup(buf, EX_UUID_LEN, GFP_KERNEL);
Kinglong Mee0d637902014-05-23 19:59:06 +0800503 if (*puuid == NULL)
504 return -ENOMEM;
505
506 return 0;
507}
508
Linus Torvalds1da177e2005-04-16 15:20:36 -0700509static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen)
510{
511 /* client path expiry [flags anonuid anongid fsid] */
512 char *buf;
513 int len;
514 int err;
515 struct auth_domain *dom = NULL;
Al Viroc1a2a472008-08-02 01:01:02 -0400516 struct svc_export exp = {}, *expp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517 int an_int;
518
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519 if (mesg[mlen-1] != '\n')
520 return -EINVAL;
521 mesg[mlen-1] = 0;
522
523 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
Al Viroc1a2a472008-08-02 01:01:02 -0400524 if (!buf)
525 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700526
527 /* client */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528 err = -EINVAL;
Al Viroc1a2a472008-08-02 01:01:02 -0400529 len = qword_get(&mesg, buf, PAGE_SIZE);
530 if (len <= 0)
531 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532
533 err = -ENOENT;
534 dom = auth_domain_find(buf);
535 if (!dom)
536 goto out;
537
538 /* path */
539 err = -EINVAL;
Al Viroc1a2a472008-08-02 01:01:02 -0400540 if ((len = qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
541 goto out1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542
Al Viroc1a2a472008-08-02 01:01:02 -0400543 err = kern_path(buf, 0, &exp.ex_path);
544 if (err)
545 goto out1;
546
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547 exp.ex_client = dom;
Stanislav Kinsburskydb3a3532012-03-28 19:09:08 +0400548 exp.cd = cd;
Christoph Hellwig9cf514c2014-05-05 13:11:59 +0200549 exp.ex_devid_map = NULL;
Al Viroc1a2a472008-08-02 01:01:02 -0400550
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551 /* expiry */
552 err = -EINVAL;
553 exp.h.expiry_time = get_expiry(&mesg);
554 if (exp.h.expiry_time == 0)
Al Viroc1a2a472008-08-02 01:01:02 -0400555 goto out3;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700556
557 /* flags */
558 err = get_int(&mesg, &an_int);
J. Bruce Fields4a4b8832007-07-31 00:37:53 -0700559 if (err == -ENOENT) {
560 err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561 set_bit(CACHE_NEGATIVE, &exp.h.flags);
J. Bruce Fields4a4b8832007-07-31 00:37:53 -0700562 } else {
Al Viroc1a2a472008-08-02 01:01:02 -0400563 if (err || an_int < 0)
564 goto out3;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565 exp.ex_flags= an_int;
566
567 /* anon uid */
568 err = get_int(&mesg, &an_int);
Al Viroc1a2a472008-08-02 01:01:02 -0400569 if (err)
570 goto out3;
Eric W. Biederman4c1e1b32013-02-02 06:42:53 -0800571 exp.ex_anon_uid= make_kuid(&init_user_ns, an_int);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572
573 /* anon gid */
574 err = get_int(&mesg, &an_int);
Al Viroc1a2a472008-08-02 01:01:02 -0400575 if (err)
576 goto out3;
Eric W. Biederman4c1e1b32013-02-02 06:42:53 -0800577 exp.ex_anon_gid= make_kgid(&init_user_ns, an_int);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700578
579 /* fsid */
580 err = get_int(&mesg, &an_int);
Al Viroc1a2a472008-08-02 01:01:02 -0400581 if (err)
582 goto out3;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700583 exp.ex_fsid = an_int;
584
NeilBrownaf6a4e22007-02-14 00:33:12 -0800585 while ((len = qword_get(&mesg, buf, PAGE_SIZE)) > 0) {
586 if (strcmp(buf, "fsloc") == 0)
587 err = fsloc_parse(&mesg, buf, &exp.ex_fslocs);
Kinglong Mee0d637902014-05-23 19:59:06 +0800588 else if (strcmp(buf, "uuid") == 0)
589 err = uuid_parse(&mesg, buf, &exp.ex_uuid);
590 else if (strcmp(buf, "secinfo") == 0)
Andy Adamsone677bfe2007-07-17 04:04:42 -0700591 err = secinfo_parse(&mesg, buf, &exp);
592 else
NeilBrownaf6a4e22007-02-14 00:33:12 -0800593 /* quietly ignore unknown words and anything
594 * following. Newer user-space can try to set
595 * new values, then see what the result was.
596 */
597 break;
598 if (err)
Al Viroc1a2a472008-08-02 01:01:02 -0400599 goto out4;
NeilBrownaf6a4e22007-02-14 00:33:12 -0800600 }
Manoj Naik933469192006-10-04 02:16:18 -0700601
David Howells2b0143b2015-03-17 22:25:59 +0000602 err = check_export(d_inode(exp.ex_path.dentry), &exp.ex_flags,
NeilBrownaf6a4e22007-02-14 00:33:12 -0800603 exp.ex_uuid);
Al Viroc1a2a472008-08-02 01:01:02 -0400604 if (err)
605 goto out4;
J. Bruce Fields427d6c62013-09-13 11:08:45 -0400606 /*
J. Bruce Fields6f6cc322013-09-13 17:50:42 -0400607 * No point caching this if it would immediately expire.
608 * Also, this protects exportfs's dummy export from the
609 * anon_uid/anon_gid checks:
610 */
611 if (exp.h.expiry_time < seconds_since_boot())
612 goto out4;
613 /*
J. Bruce Fields427d6c62013-09-13 11:08:45 -0400614 * For some reason exportfs has been passing down an
615 * invalid (-1) uid & gid on the "dummy" export which it
616 * uses to test export support. To make sure exportfs
617 * sees errors from check_export we therefore need to
618 * delay these checks till after check_export:
619 */
J. Bruce Fields6f6cc322013-09-13 17:50:42 -0400620 err = -EINVAL;
J. Bruce Fields427d6c62013-09-13 11:08:45 -0400621 if (!uid_valid(exp.ex_anon_uid))
622 goto out4;
623 if (!gid_valid(exp.ex_anon_gid))
624 goto out4;
J. Bruce Fields6f6cc322013-09-13 17:50:42 -0400625 err = 0;
Christoph Hellwig9cf514c2014-05-05 13:11:59 +0200626
627 nfsd4_setup_layout_type(&exp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700628 }
629
NeilBrown4f7774c2006-03-27 01:15:03 -0800630 expp = svc_export_lookup(&exp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700631 if (expp)
NeilBrown4f7774c2006-03-27 01:15:03 -0800632 expp = svc_export_update(&exp, expp);
633 else
634 err = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700635 cache_flush();
NeilBrown4f7774c2006-03-27 01:15:03 -0800636 if (expp == NULL)
637 err = -ENOMEM;
638 else
639 exp_put(expp);
Al Viroc1a2a472008-08-02 01:01:02 -0400640out4:
NeilBrownaf6a4e22007-02-14 00:33:12 -0800641 nfsd4_fslocs_free(&exp.ex_fslocs);
642 kfree(exp.ex_uuid);
Al Viroc1a2a472008-08-02 01:01:02 -0400643out3:
Al Viroc1a2a472008-08-02 01:01:02 -0400644 path_put(&exp.ex_path);
645out1:
646 auth_domain_put(dom);
647out:
Jesper Juhlf99d49a2005-11-07 01:01:34 -0800648 kfree(buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700649 return err;
650}
651
Manoj Naik933469192006-10-04 02:16:18 -0700652static void exp_flags(struct seq_file *m, int flag, int fsid,
Eric W. Biederman4c1e1b32013-02-02 06:42:53 -0800653 kuid_t anonu, kgid_t anong, struct nfsd4_fs_locations *fslocs);
J. Bruce Fields91fe39d2007-07-17 04:04:49 -0700654static void show_secinfo(struct seq_file *m, struct svc_export *exp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700655
656static int svc_export_show(struct seq_file *m,
657 struct cache_detail *cd,
658 struct cache_head *h)
659{
660 struct svc_export *exp ;
661
662 if (h ==NULL) {
663 seq_puts(m, "#path domain(flags)\n");
664 return 0;
665 }
666 exp = container_of(h, struct svc_export, h);
Jan Blunckc32c2f62008-02-14 19:38:43 -0800667 seq_path(m, &exp->ex_path, " \t\n\\");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700668 seq_putc(m, '\t');
669 seq_escape(m, exp->ex_client->name, " \t\n\\");
670 seq_putc(m, '(');
671 if (test_bit(CACHE_VALID, &h->flags) &&
NeilBrownaf6a4e22007-02-14 00:33:12 -0800672 !test_bit(CACHE_NEGATIVE, &h->flags)) {
Manoj Naik933469192006-10-04 02:16:18 -0700673 exp_flags(m, exp->ex_flags, exp->ex_fsid,
674 exp->ex_anon_uid, exp->ex_anon_gid, &exp->ex_fslocs);
NeilBrownaf6a4e22007-02-14 00:33:12 -0800675 if (exp->ex_uuid) {
676 int i;
677 seq_puts(m, ",uuid=");
Kinglong Mee94eb3682014-05-23 20:00:19 +0800678 for (i = 0; i < EX_UUID_LEN; i++) {
NeilBrownaf6a4e22007-02-14 00:33:12 -0800679 if ((i&3) == 0 && i)
680 seq_putc(m, ':');
681 seq_printf(m, "%02x", exp->ex_uuid[i]);
682 }
683 }
J. Bruce Fields91fe39d2007-07-17 04:04:49 -0700684 show_secinfo(m, exp);
NeilBrownaf6a4e22007-02-14 00:33:12 -0800685 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700686 seq_puts(m, ")\n");
687 return 0;
688}
NeilBrown4f7774c2006-03-27 01:15:03 -0800689static int svc_export_match(struct cache_head *a, struct cache_head *b)
690{
691 struct svc_export *orig = container_of(a, struct svc_export, h);
692 struct svc_export *new = container_of(b, struct svc_export, h);
693 return orig->ex_client == new->ex_client &&
Kinglong Meeb77a4b22015-03-15 23:13:32 +0800694 path_equal(&orig->ex_path, &new->ex_path);
NeilBrown4f7774c2006-03-27 01:15:03 -0800695}
696
697static void svc_export_init(struct cache_head *cnew, struct cache_head *citem)
698{
699 struct svc_export *new = container_of(cnew, struct svc_export, h);
700 struct svc_export *item = container_of(citem, struct svc_export, h);
701
702 kref_get(&item->ex_client->ref);
703 new->ex_client = item->ex_client;
Kinglong Mee0da22a92014-06-10 22:04:43 +0800704 new->ex_path = item->ex_path;
705 path_get(&item->ex_path);
Manoj Naik933469192006-10-04 02:16:18 -0700706 new->ex_fslocs.locations = NULL;
707 new->ex_fslocs.locations_count = 0;
708 new->ex_fslocs.migrated = 0;
Christoph Hellwig9cf514c2014-05-05 13:11:59 +0200709 new->ex_layout_type = 0;
Jeff Layton2eeb9b22013-02-02 05:55:08 -0500710 new->ex_uuid = NULL;
Stanislav Kinsburskydb3a3532012-03-28 19:09:08 +0400711 new->cd = item->cd;
NeilBrown4f7774c2006-03-27 01:15:03 -0800712}
713
714static void export_update(struct cache_head *cnew, struct cache_head *citem)
715{
716 struct svc_export *new = container_of(cnew, struct svc_export, h);
717 struct svc_export *item = container_of(citem, struct svc_export, h);
Andy Adamsone677bfe2007-07-17 04:04:42 -0700718 int i;
NeilBrown4f7774c2006-03-27 01:15:03 -0800719
720 new->ex_flags = item->ex_flags;
721 new->ex_anon_uid = item->ex_anon_uid;
722 new->ex_anon_gid = item->ex_anon_gid;
723 new->ex_fsid = item->ex_fsid;
Christoph Hellwig9cf514c2014-05-05 13:11:59 +0200724 new->ex_devid_map = item->ex_devid_map;
725 item->ex_devid_map = NULL;
NeilBrownaf6a4e22007-02-14 00:33:12 -0800726 new->ex_uuid = item->ex_uuid;
727 item->ex_uuid = NULL;
Manoj Naik933469192006-10-04 02:16:18 -0700728 new->ex_fslocs.locations = item->ex_fslocs.locations;
729 item->ex_fslocs.locations = NULL;
730 new->ex_fslocs.locations_count = item->ex_fslocs.locations_count;
731 item->ex_fslocs.locations_count = 0;
732 new->ex_fslocs.migrated = item->ex_fslocs.migrated;
733 item->ex_fslocs.migrated = 0;
Christoph Hellwig9cf514c2014-05-05 13:11:59 +0200734 new->ex_layout_type = item->ex_layout_type;
Andy Adamsone677bfe2007-07-17 04:04:42 -0700735 new->ex_nflavors = item->ex_nflavors;
736 for (i = 0; i < MAX_SECINFO_LIST; i++) {
737 new->ex_flavors[i] = item->ex_flavors[i];
738 }
NeilBrown4f7774c2006-03-27 01:15:03 -0800739}
740
741static struct cache_head *svc_export_alloc(void)
742{
743 struct svc_export *i = kmalloc(sizeof(*i), GFP_KERNEL);
744 if (i)
745 return &i->h;
746 else
747 return NULL;
748}
749
J. Bruce Fields2355c592012-04-25 16:56:22 -0400750static struct cache_detail svc_export_cache_template = {
Bruce Allanf35279d2005-09-06 15:17:08 -0700751 .owner = THIS_MODULE,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700752 .hash_size = EXPORT_HASHMAX,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700753 .name = "nfsd.export",
754 .cache_put = svc_export_put,
Stanislav Kinsbursky73fb8472013-02-04 14:02:45 +0300755 .cache_request = svc_export_request,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700756 .cache_parse = svc_export_parse,
757 .cache_show = svc_export_show,
NeilBrown4f7774c2006-03-27 01:15:03 -0800758 .match = svc_export_match,
759 .init = svc_export_init,
760 .update = export_update,
761 .alloc = svc_export_alloc,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700762};
763
NeilBrown61f86032010-02-03 17:31:31 +1100764static int
765svc_export_hash(struct svc_export *exp)
766{
767 int hash;
768
769 hash = hash_ptr(exp->ex_client, EXPORT_HASHBITS);
770 hash ^= hash_ptr(exp->ex_path.dentry, EXPORT_HASHBITS);
771 hash ^= hash_ptr(exp->ex_path.mnt, EXPORT_HASHBITS);
772 return hash;
773}
774
NeilBrown4f7774c2006-03-27 01:15:03 -0800775static struct svc_export *
776svc_export_lookup(struct svc_export *exp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700777{
NeilBrown4f7774c2006-03-27 01:15:03 -0800778 struct cache_head *ch;
NeilBrown61f86032010-02-03 17:31:31 +1100779 int hash = svc_export_hash(exp);
NeilBrown4f7774c2006-03-27 01:15:03 -0800780
Stanislav Kinsburskydb3a3532012-03-28 19:09:08 +0400781 ch = sunrpc_cache_lookup(exp->cd, &exp->h, hash);
NeilBrown4f7774c2006-03-27 01:15:03 -0800782 if (ch)
783 return container_of(ch, struct svc_export, h);
784 else
785 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700786}
787
Adrian Bunk74cae612006-03-27 01:15:10 -0800788static struct svc_export *
NeilBrown4f7774c2006-03-27 01:15:03 -0800789svc_export_update(struct svc_export *new, struct svc_export *old)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700790{
NeilBrown4f7774c2006-03-27 01:15:03 -0800791 struct cache_head *ch;
NeilBrown61f86032010-02-03 17:31:31 +1100792 int hash = svc_export_hash(old);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700793
Stanislav Kinsburskydb3a3532012-03-28 19:09:08 +0400794 ch = sunrpc_cache_update(old->cd, &new->h, &old->h, hash);
NeilBrown4f7774c2006-03-27 01:15:03 -0800795 if (ch)
796 return container_of(ch, struct svc_export, h);
797 else
798 return NULL;
799}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700800
801
Adrian Bunk74cae612006-03-27 01:15:10 -0800802static struct svc_expkey *
Kinglong Meee6d615f2014-05-23 20:55:43 +0800803exp_find_key(struct cache_detail *cd, struct auth_domain *clp, int fsid_type,
Stanislav Kinsburskyc89172e2012-03-28 19:09:50 +0400804 u32 *fsidv, struct cache_req *reqp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700805{
806 struct svc_expkey key, *ek;
807 int err;
808
809 if (!clp)
J. Bruce Fields2d3bb252007-07-17 04:04:40 -0700810 return ERR_PTR(-ENOENT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700811
812 key.ek_client = clp;
813 key.ek_fsidtype = fsid_type;
814 memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
815
Stanislav Kinsburskyc89172e2012-03-28 19:09:50 +0400816 ek = svc_expkey_lookup(cd, &key);
J. Bruce Fields2d3bb252007-07-17 04:04:40 -0700817 if (ek == NULL)
818 return ERR_PTR(-ENOMEM);
Stanislav Kinsburskyc89172e2012-03-28 19:09:50 +0400819 err = cache_check(cd, &ek->h, reqp);
J. Bruce Fields2d3bb252007-07-17 04:04:40 -0700820 if (err)
821 return ERR_PTR(err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700822 return ek;
823}
824
Kinglong Meee6d615f2014-05-23 20:55:43 +0800825static struct svc_export *
826exp_get_by_name(struct cache_detail *cd, struct auth_domain *clp,
827 const struct path *path, struct cache_req *reqp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700828{
829 struct svc_export *exp, key;
J. Bruce Fields2d3bb252007-07-17 04:04:40 -0700830 int err;
Jan Bluncke83aece2008-02-14 19:38:41 -0800831
Linus Torvalds1da177e2005-04-16 15:20:36 -0700832 if (!clp)
J. Bruce Fields2d3bb252007-07-17 04:04:40 -0700833 return ERR_PTR(-ENOENT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700834
835 key.ex_client = clp;
Al Viro55430e22009-04-18 02:04:46 -0400836 key.ex_path = *path;
Stanislav Kinsbursky2a75cfa2012-03-28 19:09:42 +0400837 key.cd = cd;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700838
NeilBrown4f7774c2006-03-27 01:15:03 -0800839 exp = svc_export_lookup(&key);
J. Bruce Fields2d3bb252007-07-17 04:04:40 -0700840 if (exp == NULL)
841 return ERR_PTR(-ENOMEM);
Stanislav Kinsbursky2a75cfa2012-03-28 19:09:42 +0400842 err = cache_check(cd, &exp->h, reqp);
J. Bruce Fields2d3bb252007-07-17 04:04:40 -0700843 if (err)
844 return ERR_PTR(err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700845 return exp;
846}
847
848/*
849 * Find the export entry for a given dentry.
850 */
Kinglong Meee6d615f2014-05-23 20:55:43 +0800851static struct svc_export *
852exp_parent(struct cache_detail *cd, struct auth_domain *clp, struct path *path)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700853{
Al Viro5bf3bd22009-04-18 02:14:32 -0400854 struct dentry *saved = dget(path->dentry);
Kinglong Meee6d615f2014-05-23 20:55:43 +0800855 struct svc_export *exp = exp_get_by_name(cd, clp, path, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700856
Al Viro5bf3bd22009-04-18 02:14:32 -0400857 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) {
858 struct dentry *parent = dget_parent(path->dentry);
859 dput(path->dentry);
860 path->dentry = parent;
Stanislav Kinsbursky2a75cfa2012-03-28 19:09:42 +0400861 exp = exp_get_by_name(cd, clp, path, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700862 }
Al Viro5bf3bd22009-04-18 02:14:32 -0400863 dput(path->dentry);
864 path->dentry = saved;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700865 return exp;
866}
867
Linus Torvalds1da177e2005-04-16 15:20:36 -0700868
Linus Torvalds1da177e2005-04-16 15:20:36 -0700869
870/*
871 * Obtain the root fh on behalf of a client.
872 * This could be done in user space, but I feel that it adds some safety
873 * since its harder to fool a kernel module than a user space program.
874 */
875int
Kinglong Meee6d615f2014-05-23 20:55:43 +0800876exp_rootfh(struct net *net, struct auth_domain *clp, char *name,
Stanislav Kinsbursky2a75cfa2012-03-28 19:09:42 +0400877 struct knfsd_fh *f, int maxsize)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700878{
879 struct svc_export *exp;
Al Viroa63bb992008-08-02 01:03:36 -0400880 struct path path;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700881 struct inode *inode;
882 struct svc_fh fh;
883 int err;
Stanislav Kinsburskyb3853e02012-04-11 15:13:21 +0400884 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
885 struct cache_detail *cd = nn->svc_export_cache;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700886
887 err = -EPERM;
888 /* NB: we probably ought to check that it's NUL-terminated */
Al Viroa63bb992008-08-02 01:03:36 -0400889 if (kern_path(name, 0, &path)) {
890 printk("nfsd: exp_rootfh path not found %s", name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700891 return err;
892 }
David Howells2b0143b2015-03-17 22:25:59 +0000893 inode = d_inode(path.dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700894
895 dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n",
Al Viroa63bb992008-08-02 01:03:36 -0400896 name, path.dentry, clp->name,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700897 inode->i_sb->s_id, inode->i_ino);
Stanislav Kinsbursky2a75cfa2012-03-28 19:09:42 +0400898 exp = exp_parent(cd, clp, &path);
J.Bruce Fields4b41bd82006-12-13 00:35:21 -0800899 if (IS_ERR(exp)) {
900 err = PTR_ERR(exp);
901 goto out;
902 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700903
904 /*
905 * fh must be initialized before calling fh_compose
906 */
907 fh_init(&fh, maxsize);
Al Viroa63bb992008-08-02 01:03:36 -0400908 if (fh_compose(&fh, exp, path.dentry, NULL))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700909 err = -EINVAL;
910 else
911 err = 0;
912 memcpy(f, &fh.fh_handle, sizeof(struct knfsd_fh));
913 fh_put(&fh);
914 exp_put(exp);
915out:
Al Viroa63bb992008-08-02 01:03:36 -0400916 path_put(&path);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700917 return err;
918}
919
Stanislav Kinsbursky2a75cfa2012-03-28 19:09:42 +0400920static struct svc_export *exp_find(struct cache_detail *cd,
921 struct auth_domain *clp, int fsid_type,
Adrian Bunkcce76f92007-10-16 01:27:52 -0700922 u32 *fsidv, struct cache_req *reqp)
NeilBrowneab7e2e2006-03-27 01:15:00 -0800923{
924 struct svc_export *exp;
Stanislav Kinsburskye5f06f72012-04-11 15:13:28 +0400925 struct nfsd_net *nn = net_generic(cd->net, nfsd_net_id);
926 struct svc_expkey *ek = exp_find_key(nn->svc_expkey_cache, clp, fsid_type, fsidv, reqp);
J. Bruce Fields2d3bb252007-07-17 04:04:40 -0700927 if (IS_ERR(ek))
David Howellse231c2e2008-02-07 00:15:26 -0800928 return ERR_CAST(ek);
NeilBrowneab7e2e2006-03-27 01:15:00 -0800929
Stanislav Kinsbursky2a75cfa2012-03-28 19:09:42 +0400930 exp = exp_get_by_name(cd, clp, &ek->ek_path, reqp);
Stanislav Kinsburskye5f06f72012-04-11 15:13:28 +0400931 cache_put(&ek->h, nn->svc_expkey_cache);
NeilBrowneab7e2e2006-03-27 01:15:00 -0800932
J. Bruce Fields2d3bb252007-07-17 04:04:40 -0700933 if (IS_ERR(exp))
David Howellse231c2e2008-02-07 00:15:26 -0800934 return ERR_CAST(exp);
NeilBrowneab7e2e2006-03-27 01:15:00 -0800935 return exp;
936}
937
Andy Adamson32c1eb02007-07-17 04:04:48 -0700938__be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp)
939{
940 struct exp_flavor_info *f;
941 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
942
943 /* legacy gss-only clients are always OK: */
944 if (exp->ex_client == rqstp->rq_gssclient)
945 return 0;
946 /* ip-address based client; check sec= export option: */
947 for (f = exp->ex_flavors; f < end; f++) {
J. Bruce Fieldsd5497fc2012-05-14 22:06:49 -0400948 if (f->pseudoflavor == rqstp->rq_cred.cr_flavor)
Andy Adamson32c1eb02007-07-17 04:04:48 -0700949 return 0;
950 }
951 /* defaults in absence of sec= options: */
952 if (exp->ex_nflavors == 0) {
J. Bruce Fieldsd5497fc2012-05-14 22:06:49 -0400953 if (rqstp->rq_cred.cr_flavor == RPC_AUTH_NULL ||
954 rqstp->rq_cred.cr_flavor == RPC_AUTH_UNIX)
Andy Adamson32c1eb02007-07-17 04:04:48 -0700955 return 0;
956 }
957 return nfserr_wrongsec;
958}
959
J. Bruce Fields0989a782007-07-17 04:04:44 -0700960/*
J. Bruce Fields2ea22092007-07-17 04:04:46 -0700961 * Uses rq_client and rq_gssclient to find an export; uses rq_client (an
962 * auth_unix client) if it's available and has secinfo information;
963 * otherwise, will try to use rq_gssclient.
964 *
J. Bruce Fields0989a782007-07-17 04:04:44 -0700965 * Called from functions that handle requests; functions that do work on
966 * behalf of mountd are passed a single client name to use, and should
967 * use exp_get_by_name() or exp_find().
968 */
969struct svc_export *
Al Viro91c9fa82009-04-18 02:42:05 -0400970rqst_exp_get_by_name(struct svc_rqst *rqstp, struct path *path)
J. Bruce Fields0989a782007-07-17 04:04:44 -0700971{
J. Bruce Fields9a25b962007-07-19 01:49:18 -0700972 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
Stanislav Kinsbursky9695c702012-07-25 16:57:06 +0400973 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
Stanislav Kinsburskyb3853e02012-04-11 15:13:21 +0400974 struct cache_detail *cd = nn->svc_export_cache;
J. Bruce Fields3ab4d8b2007-07-17 04:04:46 -0700975
J. Bruce Fields2ea22092007-07-17 04:04:46 -0700976 if (rqstp->rq_client == NULL)
977 goto gss;
978
979 /* First try the auth_unix client: */
Stanislav Kinsbursky2a75cfa2012-03-28 19:09:42 +0400980 exp = exp_get_by_name(cd, rqstp->rq_client, path, &rqstp->rq_chandle);
J. Bruce Fields2ea22092007-07-17 04:04:46 -0700981 if (PTR_ERR(exp) == -ENOENT)
982 goto gss;
983 if (IS_ERR(exp))
984 return exp;
985 /* If it has secinfo, assume there are no gss/... clients */
986 if (exp->ex_nflavors > 0)
987 return exp;
988gss:
989 /* Otherwise, try falling back on gss client */
990 if (rqstp->rq_gssclient == NULL)
991 return exp;
Stanislav Kinsbursky2a75cfa2012-03-28 19:09:42 +0400992 gssexp = exp_get_by_name(cd, rqstp->rq_gssclient, path, &rqstp->rq_chandle);
J. Bruce Fields2ea22092007-07-17 04:04:46 -0700993 if (PTR_ERR(gssexp) == -ENOENT)
994 return exp;
J. Bruce Fields9a25b962007-07-19 01:49:18 -0700995 if (!IS_ERR(exp))
J. Bruce Fields2ea22092007-07-17 04:04:46 -0700996 exp_put(exp);
997 return gssexp;
J. Bruce Fields0989a782007-07-17 04:04:44 -0700998}
999
1000struct svc_export *
1001rqst_exp_find(struct svc_rqst *rqstp, int fsid_type, u32 *fsidv)
1002{
J. Bruce Fields9a25b962007-07-19 01:49:18 -07001003 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
Stanislav Kinsbursky9695c702012-07-25 16:57:06 +04001004 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
Stanislav Kinsburskyb3853e02012-04-11 15:13:21 +04001005 struct cache_detail *cd = nn->svc_export_cache;
J. Bruce Fields3ab4d8b2007-07-17 04:04:46 -07001006
J. Bruce Fields2ea22092007-07-17 04:04:46 -07001007 if (rqstp->rq_client == NULL)
1008 goto gss;
1009
1010 /* First try the auth_unix client: */
Stanislav Kinsbursky2a75cfa2012-03-28 19:09:42 +04001011 exp = exp_find(cd, rqstp->rq_client, fsid_type,
1012 fsidv, &rqstp->rq_chandle);
J. Bruce Fields2ea22092007-07-17 04:04:46 -07001013 if (PTR_ERR(exp) == -ENOENT)
1014 goto gss;
1015 if (IS_ERR(exp))
1016 return exp;
1017 /* If it has secinfo, assume there are no gss/... clients */
1018 if (exp->ex_nflavors > 0)
1019 return exp;
1020gss:
1021 /* Otherwise, try falling back on gss client */
1022 if (rqstp->rq_gssclient == NULL)
1023 return exp;
Stanislav Kinsbursky2a75cfa2012-03-28 19:09:42 +04001024 gssexp = exp_find(cd, rqstp->rq_gssclient, fsid_type, fsidv,
J. Bruce Fields2ea22092007-07-17 04:04:46 -07001025 &rqstp->rq_chandle);
1026 if (PTR_ERR(gssexp) == -ENOENT)
1027 return exp;
J. Bruce Fields9a25b962007-07-19 01:49:18 -07001028 if (!IS_ERR(exp))
J. Bruce Fields2ea22092007-07-17 04:04:46 -07001029 exp_put(exp);
1030 return gssexp;
J. Bruce Fields0989a782007-07-17 04:04:44 -07001031}
1032
1033struct svc_export *
Al Viroe64c3902009-04-18 03:00:46 -04001034rqst_exp_parent(struct svc_rqst *rqstp, struct path *path)
J. Bruce Fields0989a782007-07-17 04:04:44 -07001035{
Al Viroe64c3902009-04-18 03:00:46 -04001036 struct dentry *saved = dget(path->dentry);
1037 struct svc_export *exp = rqst_exp_get_by_name(rqstp, path);
J. Bruce Fields3ab4d8b2007-07-17 04:04:46 -07001038
Al Viroe64c3902009-04-18 03:00:46 -04001039 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) {
1040 struct dentry *parent = dget_parent(path->dentry);
1041 dput(path->dentry);
1042 path->dentry = parent;
1043 exp = rqst_exp_get_by_name(rqstp, path);
J. Bruce Fields2ea22092007-07-17 04:04:46 -07001044 }
Al Viroe64c3902009-04-18 03:00:46 -04001045 dput(path->dentry);
1046 path->dentry = saved;
J. Bruce Fields2ea22092007-07-17 04:04:46 -07001047 return exp;
J. Bruce Fields0989a782007-07-17 04:04:44 -07001048}
NeilBrowneab7e2e2006-03-27 01:15:00 -08001049
Trond Myklebusted748aa2011-09-12 19:37:06 -04001050struct svc_export *rqst_find_fsidzero_export(struct svc_rqst *rqstp)
J. Bruce Fieldsf39bde22009-09-27 14:41:43 -04001051{
J. Bruce Fieldsf39bde22009-09-27 14:41:43 -04001052 u32 fsidv[2];
1053
1054 mk_fsid(FSID_NUM, fsidv, 0, 0, 0, NULL);
1055
J. Bruce Fields260c64d2010-02-08 13:42:26 -05001056 return rqst_exp_find(rqstp, FSID_NUM, fsidv);
J. Bruce Fieldsf39bde22009-09-27 14:41:43 -04001057}
1058
Linus Torvalds1da177e2005-04-16 15:20:36 -07001059/*
1060 * Called when we need the filehandle for the root of the pseudofs,
1061 * for a given NFSv4 client. The root is defined to be the
1062 * export point with fsid==0
1063 */
Al Viroc7afef12006-10-19 23:29:02 -07001064__be32
J. Bruce Fieldsdf547ef2007-07-17 04:04:43 -07001065exp_pseudoroot(struct svc_rqst *rqstp, struct svc_fh *fhp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001066{
NeilBrowneab7e2e2006-03-27 01:15:00 -08001067 struct svc_export *exp;
Al Viroc7afef12006-10-19 23:29:02 -07001068 __be32 rv;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001069
Trond Myklebusted748aa2011-09-12 19:37:06 -04001070 exp = rqst_find_fsidzero_export(rqstp);
J.Bruce Fields68993202006-12-13 00:35:23 -08001071 if (IS_ERR(exp))
1072 return nfserrno(PTR_ERR(exp));
Jan Blunck54775492008-02-14 19:38:39 -08001073 rv = fh_compose(fhp, exp, exp->ex_path.dentry, NULL);
J.Bruce Fieldsd0ebd9c2006-10-04 02:16:10 -07001074 exp_put(exp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001075 return rv;
1076}
1077
Linus Torvalds1da177e2005-04-16 15:20:36 -07001078static struct flags {
1079 int flag;
1080 char *name[2];
1081} expflags[] = {
1082 { NFSEXP_READONLY, {"ro", "rw"}},
1083 { NFSEXP_INSECURE_PORT, {"insecure", ""}},
1084 { NFSEXP_ROOTSQUASH, {"root_squash", "no_root_squash"}},
1085 { NFSEXP_ALLSQUASH, {"all_squash", ""}},
1086 { NFSEXP_ASYNC, {"async", "sync"}},
1087 { NFSEXP_GATHERED_WRITES, {"wdelay", "no_wdelay"}},
Rajesh Ghanekar18c01ab2014-08-01 22:17:30 -04001088 { NFSEXP_NOREADDIRPLUS, {"nordirplus", ""}},
Linus Torvalds1da177e2005-04-16 15:20:36 -07001089 { NFSEXP_NOHIDE, {"nohide", ""}},
1090 { NFSEXP_CROSSMOUNT, {"crossmnt", ""}},
1091 { NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}},
1092 { NFSEXP_NOAUTHNLM, {"insecure_locks", ""}},
Steve Dicksoneb4c86c2009-09-09 14:58:22 -04001093 { NFSEXP_V4ROOT, {"v4root", ""}},
Christoph Hellwig9b3075c2015-04-01 01:37:05 -07001094 { NFSEXP_PNFS, {"pnfs", ""}},
Linus Torvalds1da177e2005-04-16 15:20:36 -07001095 { 0, {"", ""}}
1096};
1097
J. Bruce Fieldsac34cdb2007-07-17 04:04:49 -07001098static void show_expflags(struct seq_file *m, int flags, int mask)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001099{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001100 struct flags *flg;
J. Bruce Fieldsac34cdb2007-07-17 04:04:49 -07001101 int state, first = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001102
1103 for (flg = expflags; flg->flag; flg++) {
J. Bruce Fieldsac34cdb2007-07-17 04:04:49 -07001104 if (flg->flag & ~mask)
1105 continue;
1106 state = (flg->flag & flags) ? 0 : 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001107 if (*flg->name[state])
1108 seq_printf(m, "%s%s", first++?",":"", flg->name[state]);
1109 }
J. Bruce Fieldsac34cdb2007-07-17 04:04:49 -07001110}
1111
J. Bruce Fields91fe39d2007-07-17 04:04:49 -07001112static void show_secinfo_flags(struct seq_file *m, int flags)
1113{
1114 seq_printf(m, ",");
1115 show_expflags(m, flags, NFSEXP_SECINFO_FLAGS);
1116}
1117
J. Bruce Fields74ec1e12010-09-24 17:43:59 -04001118static bool secinfo_flags_equal(int f, int g)
1119{
1120 f &= NFSEXP_SECINFO_FLAGS;
1121 g &= NFSEXP_SECINFO_FLAGS;
1122 return f == g;
1123}
1124
1125static int show_secinfo_run(struct seq_file *m, struct exp_flavor_info **fp, struct exp_flavor_info *end)
1126{
1127 int flags;
1128
1129 flags = (*fp)->flags;
1130 seq_printf(m, ",sec=%d", (*fp)->pseudoflavor);
1131 (*fp)++;
1132 while (*fp != end && secinfo_flags_equal(flags, (*fp)->flags)) {
1133 seq_printf(m, ":%d", (*fp)->pseudoflavor);
1134 (*fp)++;
1135 }
1136 return flags;
1137}
1138
J. Bruce Fields91fe39d2007-07-17 04:04:49 -07001139static void show_secinfo(struct seq_file *m, struct svc_export *exp)
1140{
1141 struct exp_flavor_info *f;
1142 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
J. Bruce Fields74ec1e12010-09-24 17:43:59 -04001143 int flags;
J. Bruce Fields91fe39d2007-07-17 04:04:49 -07001144
1145 if (exp->ex_nflavors == 0)
1146 return;
J. Bruce Fields74ec1e12010-09-24 17:43:59 -04001147 f = exp->ex_flavors;
1148 flags = show_secinfo_run(m, &f, end);
1149 if (!secinfo_flags_equal(flags, exp->ex_flags))
1150 show_secinfo_flags(m, flags);
1151 while (f != end) {
1152 flags = show_secinfo_run(m, &f, end);
1153 show_secinfo_flags(m, flags);
J. Bruce Fields91fe39d2007-07-17 04:04:49 -07001154 }
J. Bruce Fields91fe39d2007-07-17 04:04:49 -07001155}
1156
J. Bruce Fieldsac34cdb2007-07-17 04:04:49 -07001157static void exp_flags(struct seq_file *m, int flag, int fsid,
Eric W. Biederman4c1e1b32013-02-02 06:42:53 -08001158 kuid_t anonu, kgid_t anong, struct nfsd4_fs_locations *fsloc)
J. Bruce Fieldsac34cdb2007-07-17 04:04:49 -07001159{
1160 show_expflags(m, flag, NFSEXP_ALLFLAGS);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001161 if (flag & NFSEXP_FSID)
J. Bruce Fieldsac34cdb2007-07-17 04:04:49 -07001162 seq_printf(m, ",fsid=%d", fsid);
Eric W. Biederman4c1e1b32013-02-02 06:42:53 -08001163 if (!uid_eq(anonu, make_kuid(&init_user_ns, (uid_t)-2)) &&
1164 !uid_eq(anonu, make_kuid(&init_user_ns, 0x10000-2)))
1165 seq_printf(m, ",anonuid=%u", from_kuid(&init_user_ns, anonu));
1166 if (!gid_eq(anong, make_kgid(&init_user_ns, (gid_t)-2)) &&
1167 !gid_eq(anong, make_kgid(&init_user_ns, 0x10000-2)))
1168 seq_printf(m, ",anongid=%u", from_kgid(&init_user_ns, anong));
Manoj Naik933469192006-10-04 02:16:18 -07001169 if (fsloc && fsloc->locations_count > 0) {
1170 char *loctype = (fsloc->migrated) ? "refer" : "replicas";
1171 int i;
1172
J. Bruce Fieldsac34cdb2007-07-17 04:04:49 -07001173 seq_printf(m, ",%s=", loctype);
Manoj Naik933469192006-10-04 02:16:18 -07001174 seq_escape(m, fsloc->locations[0].path, ",;@ \t\n\\");
1175 seq_putc(m, '@');
1176 seq_escape(m, fsloc->locations[0].hosts, ",;@ \t\n\\");
1177 for (i = 1; i < fsloc->locations_count; i++) {
1178 seq_putc(m, ';');
1179 seq_escape(m, fsloc->locations[i].path, ",;@ \t\n\\");
1180 seq_putc(m, '@');
1181 seq_escape(m, fsloc->locations[i].hosts, ",;@ \t\n\\");
1182 }
1183 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001184}
1185
1186static int e_show(struct seq_file *m, void *p)
1187{
1188 struct cache_head *cp = p;
1189 struct svc_export *exp = container_of(cp, struct svc_export, h);
Stanislav Kinsburskyf2c7ea12012-03-28 19:09:29 +04001190 struct cache_detail *cd = m->private;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001191
Greg Banksbc6f02e2006-10-02 02:17:49 -07001192 if (p == SEQ_START_TOKEN) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001193 seq_puts(m, "# Version 1.1\n");
1194 seq_puts(m, "# Path Client(Flags) # IPs\n");
1195 return 0;
1196 }
1197
Kinglong Meebf18f162014-06-10 22:06:44 +08001198 exp_get(exp);
Stanislav Kinsburskyf2c7ea12012-03-28 19:09:29 +04001199 if (cache_check(cd, &exp->h, NULL))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001200 return 0;
Stanislav Kinsburskya09581f2012-03-28 19:09:22 +04001201 exp_put(exp);
Stanislav Kinsburskyf2c7ea12012-03-28 19:09:29 +04001202 return svc_export_show(m, cd, cp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001203}
1204
James Morris88e9d342009-09-22 16:43:43 -07001205const struct seq_operations nfs_exports_op = {
Kinglong Meec8c081b2015-07-27 11:09:42 +08001206 .start = cache_seq_start,
1207 .next = cache_seq_next,
1208 .stop = cache_seq_stop,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001209 .show = e_show,
1210};
1211
Linus Torvalds1da177e2005-04-16 15:20:36 -07001212/*
1213 * Initialize the exports module.
1214 */
J. Bruce Fieldsdbf847e2007-11-08 17:20:34 -05001215int
Stanislav Kinsburskyb89109b2012-04-11 15:13:14 +04001216nfsd_export_init(struct net *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001217{
J. Bruce Fieldsdbf847e2007-11-08 17:20:34 -05001218 int rv;
Stanislav Kinsburskyb3853e02012-04-11 15:13:21 +04001219 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1220
Stanislav Kinsburskyb89109b2012-04-11 15:13:14 +04001221 dprintk("nfsd: initializing export module (net: %p).\n", net);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001222
Stanislav Kinsburskyb3853e02012-04-11 15:13:21 +04001223 nn->svc_export_cache = cache_create_net(&svc_export_cache_template, net);
1224 if (IS_ERR(nn->svc_export_cache))
1225 return PTR_ERR(nn->svc_export_cache);
1226 rv = cache_register_net(nn->svc_export_cache, net);
J. Bruce Fieldsdbf847e2007-11-08 17:20:34 -05001227 if (rv)
Stanislav Kinsburskyb3853e02012-04-11 15:13:21 +04001228 goto destroy_export_cache;
1229
Stanislav Kinsburskye5f06f72012-04-11 15:13:28 +04001230 nn->svc_expkey_cache = cache_create_net(&svc_expkey_cache_template, net);
1231 if (IS_ERR(nn->svc_expkey_cache)) {
1232 rv = PTR_ERR(nn->svc_expkey_cache);
Stanislav Kinsburskyb3853e02012-04-11 15:13:21 +04001233 goto unregister_export_cache;
Stanislav Kinsburskye5f06f72012-04-11 15:13:28 +04001234 }
1235 rv = cache_register_net(nn->svc_expkey_cache, net);
1236 if (rv)
1237 goto destroy_expkey_cache;
Stanislav Kinsburskyb3853e02012-04-11 15:13:21 +04001238 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001239
Stanislav Kinsburskye5f06f72012-04-11 15:13:28 +04001240destroy_expkey_cache:
1241 cache_destroy_net(nn->svc_expkey_cache, net);
Stanislav Kinsburskyb3853e02012-04-11 15:13:21 +04001242unregister_export_cache:
1243 cache_unregister_net(nn->svc_export_cache, net);
1244destroy_export_cache:
1245 cache_destroy_net(nn->svc_export_cache, net);
1246 return rv;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001247}
1248
1249/*
1250 * Flush exports table - called when last nfsd thread is killed
1251 */
1252void
Stanislav Kinsburskyb3853e02012-04-11 15:13:21 +04001253nfsd_export_flush(struct net *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001254{
Stanislav Kinsburskyb3853e02012-04-11 15:13:21 +04001255 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1256
Stanislav Kinsburskye5f06f72012-04-11 15:13:28 +04001257 cache_purge(nn->svc_expkey_cache);
Stanislav Kinsburskyb3853e02012-04-11 15:13:21 +04001258 cache_purge(nn->svc_export_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001259}
1260
1261/*
1262 * Shutdown the exports module.
1263 */
1264void
Stanislav Kinsburskyb89109b2012-04-11 15:13:14 +04001265nfsd_export_shutdown(struct net *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001266{
Stanislav Kinsburskyb3853e02012-04-11 15:13:21 +04001267 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001268
Stanislav Kinsburskyb89109b2012-04-11 15:13:14 +04001269 dprintk("nfsd: shutting down export module (net: %p).\n", net);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001270
Stanislav Kinsburskye5f06f72012-04-11 15:13:28 +04001271 cache_unregister_net(nn->svc_expkey_cache, net);
Stanislav Kinsburskyb3853e02012-04-11 15:13:21 +04001272 cache_unregister_net(nn->svc_export_cache, net);
Stanislav Kinsburskye5f06f72012-04-11 15:13:28 +04001273 cache_destroy_net(nn->svc_expkey_cache, net);
Stanislav Kinsburskyb3853e02012-04-11 15:13:21 +04001274 cache_destroy_net(nn->svc_export_cache, net);
Stanislav Kinsburskye5f06f72012-04-11 15:13:28 +04001275 svcauth_unix_purge(net);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001276
Stanislav Kinsburskyb89109b2012-04-11 15:13:14 +04001277 dprintk("nfsd: export shutdown complete (net: %p).\n", net);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001278}