Commit | Line | Data |
---|---|---|
a55370a3 | 1 | /* |
a55370a3 | 2 | * Copyright (c) 2004 The Regents of the University of Michigan. |
f3f80148 | 3 | * Copyright (c) 2012 Jeff Layton <jlayton@redhat.com> |
a55370a3 N |
4 | * All rights reserved. |
5 | * | |
6 | * Andy Adamson <andros@citi.umich.edu> | |
7 | * | |
8 | * Redistribution and use in source and binary forms, with or without | |
9 | * modification, are permitted provided that the following conditions | |
10 | * are met: | |
11 | * | |
12 | * 1. Redistributions of source code must retain the above copyright | |
13 | * notice, this list of conditions and the following disclaimer. | |
14 | * 2. Redistributions in binary form must reproduce the above copyright | |
15 | * notice, this list of conditions and the following disclaimer in the | |
16 | * documentation and/or other materials provided with the distribution. | |
17 | * 3. Neither the name of the University nor the names of its | |
18 | * contributors may be used to endorse or promote products derived | |
19 | * from this software without specific prior written permission. | |
20 | * | |
21 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED | |
22 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF | |
23 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | |
24 | * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
26 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
27 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR | |
28 | * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF | |
29 | * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING | |
30 | * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS | |
31 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
32 | * | |
33 | */ | |
34 | ||
190e4fbf | 35 | #include <linux/file.h> |
5a0e3ad6 | 36 | #include <linux/slab.h> |
190e4fbf | 37 | #include <linux/namei.h> |
a55370a3 | 38 | #include <linux/crypto.h> |
e8edc6e0 | 39 | #include <linux/sched.h> |
f3f80148 | 40 | #include <linux/fs.h> |
813fd320 | 41 | #include <linux/module.h> |
f3f80148 JL |
42 | #include <net/net_namespace.h> |
43 | #include <linux/sunrpc/rpc_pipe_fs.h> | |
44 | #include <linux/sunrpc/clnt.h> | |
45 | #include <linux/nfsd/cld.h> | |
9a74af21 BH |
46 | |
47 | #include "nfsd.h" | |
48 | #include "state.h" | |
0a3adade | 49 | #include "vfs.h" |
f3f80148 | 50 | #include "netns.h" |
a55370a3 N |
51 | |
52 | #define NFSDDBG_FACILITY NFSDDBG_PROC | |
53 | ||
2a4317c5 JL |
54 | /* Declarations */ |
55 | struct nfsd4_client_tracking_ops { | |
56 | int (*init)(struct net *); | |
57 | void (*exit)(struct net *); | |
58 | void (*create)(struct nfs4_client *); | |
59 | void (*remove)(struct nfs4_client *); | |
60 | int (*check)(struct nfs4_client *); | |
12760c66 | 61 | void (*grace_done)(struct nfsd_net *, time_t); |
2a4317c5 JL |
62 | }; |
63 | ||
190e4fbf | 64 | /* Globals */ |
48483bf2 | 65 | static char user_recovery_dirname[PATH_MAX] = "/var/lib/nfs/v4recovery"; |
190e4fbf | 66 | |
d84f4f99 DH |
67 | static int |
68 | nfs4_save_creds(const struct cred **original_creds) | |
190e4fbf | 69 | { |
d84f4f99 DH |
70 | struct cred *new; |
71 | ||
72 | new = prepare_creds(); | |
73 | if (!new) | |
74 | return -ENOMEM; | |
75 | ||
6fab8779 EB |
76 | new->fsuid = GLOBAL_ROOT_UID; |
77 | new->fsgid = GLOBAL_ROOT_GID; | |
d84f4f99 DH |
78 | *original_creds = override_creds(new); |
79 | put_cred(new); | |
80 | return 0; | |
190e4fbf N |
81 | } |
82 | ||
83 | static void | |
d84f4f99 | 84 | nfs4_reset_creds(const struct cred *original) |
190e4fbf | 85 | { |
d84f4f99 | 86 | revert_creds(original); |
190e4fbf N |
87 | } |
88 | ||
a55370a3 N |
89 | static void |
90 | md5_to_hex(char *out, char *md5) | |
91 | { | |
92 | int i; | |
93 | ||
94 | for (i=0; i<16; i++) { | |
95 | unsigned char c = md5[i]; | |
96 | ||
97 | *out++ = '0' + ((c&0xf0)>>4) + (c>=0xa0)*('a'-'9'-1); | |
98 | *out++ = '0' + (c&0x0f) + ((c&0x0f)>=0x0a)*('a'-'9'-1); | |
99 | } | |
100 | *out = '\0'; | |
101 | } | |
102 | ||
2216d449 JL |
103 | static int |
104 | nfs4_make_rec_clidname(char *dname, const struct xdr_netobj *clname) | |
a55370a3 N |
105 | { |
106 | struct xdr_netobj cksum; | |
35058687 | 107 | struct hash_desc desc; |
60c74f81 | 108 | struct scatterlist sg; |
2216d449 | 109 | int status; |
a55370a3 N |
110 | |
111 | dprintk("NFSD: nfs4_make_rec_clidname for %.*s\n", | |
112 | clname->len, clname->data); | |
35058687 HX |
113 | desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP; |
114 | desc.tfm = crypto_alloc_hash("md5", 0, CRYPTO_ALG_ASYNC); | |
2216d449 JL |
115 | if (IS_ERR(desc.tfm)) { |
116 | status = PTR_ERR(desc.tfm); | |
35058687 | 117 | goto out_no_tfm; |
2216d449 JL |
118 | } |
119 | ||
35058687 | 120 | cksum.len = crypto_hash_digestsize(desc.tfm); |
a55370a3 | 121 | cksum.data = kmalloc(cksum.len, GFP_KERNEL); |
2216d449 JL |
122 | if (cksum.data == NULL) { |
123 | status = -ENOMEM; | |
a55370a3 | 124 | goto out; |
2216d449 | 125 | } |
a55370a3 | 126 | |
60c74f81 | 127 | sg_init_one(&sg, clname->data, clname->len); |
a55370a3 | 128 | |
2216d449 JL |
129 | status = crypto_hash_digest(&desc, &sg, sg.length, cksum.data); |
130 | if (status) | |
35058687 | 131 | goto out; |
a55370a3 N |
132 | |
133 | md5_to_hex(dname, cksum.data); | |
134 | ||
2216d449 | 135 | status = 0; |
a55370a3 | 136 | out: |
2bd9e7b6 | 137 | kfree(cksum.data); |
35058687 HX |
138 | crypto_free_hash(desc.tfm); |
139 | out_no_tfm: | |
a55370a3 N |
140 | return status; |
141 | } | |
190e4fbf | 142 | |
2216d449 JL |
143 | /* |
144 | * If we had an error generating the recdir name for the legacy tracker | |
145 | * then warn the admin. If the error doesn't appear to be transient, | |
146 | * then disable recovery tracking. | |
147 | */ | |
148 | static void | |
7255e716 | 149 | legacy_recdir_name_error(struct nfs4_client *clp, int error) |
2216d449 JL |
150 | { |
151 | printk(KERN_ERR "NFSD: unable to generate recoverydir " | |
152 | "name (%d).\n", error); | |
153 | ||
154 | /* | |
155 | * if the algorithm just doesn't exist, then disable the recovery | |
156 | * tracker altogether. The crypto libs will generally return this if | |
157 | * FIPS is enabled as well. | |
158 | */ | |
159 | if (error == -ENOENT) { | |
160 | printk(KERN_ERR "NFSD: disabling legacy clientid tracking. " | |
161 | "Reboot recovery will not function correctly!\n"); | |
7255e716 | 162 | nfsd4_client_tracking_exit(clp->net); |
2216d449 JL |
163 | } |
164 | } | |
165 | ||
2a4317c5 JL |
166 | static void |
167 | nfsd4_create_clid_dir(struct nfs4_client *clp) | |
c7b9a459 | 168 | { |
d84f4f99 | 169 | const struct cred *original_cred; |
2216d449 | 170 | char dname[HEXDIR_LEN]; |
e970a573 | 171 | struct dentry *dir, *dentry; |
0ce0c2b5 | 172 | struct nfs4_client_reclaim *crp; |
c7b9a459 | 173 | int status; |
52e19c09 | 174 | struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); |
c7b9a459 N |
175 | |
176 | dprintk("NFSD: nfsd4_create_clid_dir for \"%s\"\n", dname); | |
177 | ||
a52d726b | 178 | if (test_and_set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) |
7a6ef8c7 | 179 | return; |
3a073369 | 180 | if (!nn->rec_file) |
7a6ef8c7 | 181 | return; |
2216d449 JL |
182 | |
183 | status = nfs4_make_rec_clidname(dname, &clp->cl_name); | |
184 | if (status) | |
7255e716 | 185 | return legacy_recdir_name_error(clp, status); |
2216d449 | 186 | |
d84f4f99 DH |
187 | status = nfs4_save_creds(&original_cred); |
188 | if (status < 0) | |
7a6ef8c7 | 189 | return; |
c7b9a459 | 190 | |
3a073369 | 191 | status = mnt_want_write_file(nn->rec_file); |
4a55c101 JK |
192 | if (status) |
193 | return; | |
194 | ||
3a073369 | 195 | dir = nn->rec_file->f_path.dentry; |
c7b9a459 | 196 | /* lock the parent */ |
e970a573 | 197 | mutex_lock(&dir->d_inode->i_mutex); |
c7b9a459 | 198 | |
e970a573 | 199 | dentry = lookup_one_len(dname, dir, HEXDIR_LEN-1); |
c7b9a459 N |
200 | if (IS_ERR(dentry)) { |
201 | status = PTR_ERR(dentry); | |
202 | goto out_unlock; | |
203 | } | |
6577aac0 | 204 | if (dentry->d_inode) |
aec39680 BF |
205 | /* |
206 | * In the 4.1 case, where we're called from | |
207 | * reclaim_complete(), records from the previous reboot | |
208 | * may still be left, so this is OK. | |
209 | * | |
210 | * In the 4.0 case, we should never get here; but we may | |
211 | * as well be forgiving and just succeed silently. | |
212 | */ | |
c7b9a459 | 213 | goto out_put; |
e970a573 | 214 | status = vfs_mkdir(dir->d_inode, dentry, S_IRWXU); |
c7b9a459 N |
215 | out_put: |
216 | dput(dentry); | |
217 | out_unlock: | |
e970a573 | 218 | mutex_unlock(&dir->d_inode->i_mutex); |
0ce0c2b5 | 219 | if (status == 0) { |
f141f79d | 220 | if (nn->in_grace) { |
52e19c09 | 221 | crp = nfs4_client_to_reclaim(dname, nn); |
0ce0c2b5 JL |
222 | if (crp) |
223 | crp->cr_clp = clp; | |
224 | } | |
3a073369 | 225 | vfs_fsync(nn->rec_file, 0); |
0ce0c2b5 | 226 | } else { |
6577aac0 BH |
227 | printk(KERN_ERR "NFSD: failed to write recovery record" |
228 | " (err %d); please check that %s exists" | |
229 | " and is writeable", status, | |
230 | user_recovery_dirname); | |
0ce0c2b5 | 231 | } |
3a073369 | 232 | mnt_drop_write_file(nn->rec_file); |
d84f4f99 | 233 | nfs4_reset_creds(original_cred); |
c7b9a459 N |
234 | } |
235 | ||
52e19c09 | 236 | typedef int (recdir_func)(struct dentry *, struct dentry *, struct nfsd_net *); |
190e4fbf | 237 | |
05f4f678 BF |
238 | struct name_list { |
239 | char name[HEXDIR_LEN]; | |
190e4fbf N |
240 | struct list_head list; |
241 | }; | |
242 | ||
190e4fbf | 243 | static int |
05f4f678 | 244 | nfsd4_build_namelist(void *arg, const char *name, int namlen, |
afefdbb2 | 245 | loff_t offset, u64 ino, unsigned int d_type) |
190e4fbf | 246 | { |
05f4f678 BF |
247 | struct list_head *names = arg; |
248 | struct name_list *entry; | |
190e4fbf | 249 | |
05f4f678 | 250 | if (namlen != HEXDIR_LEN - 1) |
b37ad28b | 251 | return 0; |
05f4f678 BF |
252 | entry = kmalloc(sizeof(struct name_list), GFP_KERNEL); |
253 | if (entry == NULL) | |
190e4fbf | 254 | return -ENOMEM; |
05f4f678 BF |
255 | memcpy(entry->name, name, HEXDIR_LEN - 1); |
256 | entry->name[HEXDIR_LEN - 1] = '\0'; | |
257 | list_add(&entry->list, names); | |
190e4fbf N |
258 | return 0; |
259 | } | |
260 | ||
261 | static int | |
52e19c09 | 262 | nfsd4_list_rec_dir(recdir_func *f, struct nfsd_net *nn) |
190e4fbf | 263 | { |
d84f4f99 | 264 | const struct cred *original_cred; |
3a073369 | 265 | struct dentry *dir = nn->rec_file->f_path.dentry; |
0f837692 AV |
266 | struct { |
267 | struct dir_context ctx; | |
268 | struct list_head names; | |
269 | } ctx; | |
190e4fbf N |
270 | int status; |
271 | ||
d84f4f99 DH |
272 | status = nfs4_save_creds(&original_cred); |
273 | if (status < 0) | |
274 | return status; | |
190e4fbf | 275 | |
3a073369 | 276 | status = vfs_llseek(nn->rec_file, 0, SEEK_SET); |
5b4b299c AV |
277 | if (status < 0) { |
278 | nfs4_reset_creds(original_cred); | |
279 | return status; | |
280 | } | |
281 | ||
0f837692 AV |
282 | INIT_LIST_HEAD(&ctx.names); |
283 | ctx.ctx.actor = nfsd4_build_namelist; | |
284 | status = iterate_dir(nn->rec_file, &ctx.ctx); | |
8daed1e5 | 285 | mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_PARENT); |
0f837692 | 286 | while (!list_empty(&ctx.names)) { |
5b4b299c | 287 | struct name_list *entry; |
0f837692 | 288 | entry = list_entry(ctx.names.next, struct name_list, list); |
5b4b299c AV |
289 | if (!status) { |
290 | struct dentry *dentry; | |
291 | dentry = lookup_one_len(entry->name, dir, HEXDIR_LEN-1); | |
292 | if (IS_ERR(dentry)) { | |
293 | status = PTR_ERR(dentry); | |
294 | break; | |
295 | } | |
52e19c09 | 296 | status = f(dir, dentry, nn); |
5b4b299c | 297 | dput(dentry); |
05f4f678 | 298 | } |
05f4f678 BF |
299 | list_del(&entry->list); |
300 | kfree(entry); | |
190e4fbf | 301 | } |
2f9092e1 | 302 | mutex_unlock(&dir->d_inode->i_mutex); |
d84f4f99 | 303 | nfs4_reset_creds(original_cred); |
190e4fbf N |
304 | return status; |
305 | } | |
306 | ||
c7b9a459 | 307 | static int |
3a073369 | 308 | nfsd4_unlink_clid_dir(char *name, int namlen, struct nfsd_net *nn) |
c7b9a459 | 309 | { |
e970a573 | 310 | struct dentry *dir, *dentry; |
c7b9a459 N |
311 | int status; |
312 | ||
313 | dprintk("NFSD: nfsd4_unlink_clid_dir. name %.*s\n", namlen, name); | |
314 | ||
3a073369 | 315 | dir = nn->rec_file->f_path.dentry; |
e970a573 CH |
316 | mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_PARENT); |
317 | dentry = lookup_one_len(name, dir, namlen); | |
c7b9a459 N |
318 | if (IS_ERR(dentry)) { |
319 | status = PTR_ERR(dentry); | |
2f9092e1 | 320 | goto out_unlock; |
c7b9a459 N |
321 | } |
322 | status = -ENOENT; | |
323 | if (!dentry->d_inode) | |
324 | goto out; | |
e970a573 | 325 | status = vfs_rmdir(dir->d_inode, dentry); |
c7b9a459 N |
326 | out: |
327 | dput(dentry); | |
2f9092e1 | 328 | out_unlock: |
e970a573 | 329 | mutex_unlock(&dir->d_inode->i_mutex); |
c7b9a459 N |
330 | return status; |
331 | } | |
332 | ||
2a4317c5 | 333 | static void |
c7b9a459 N |
334 | nfsd4_remove_clid_dir(struct nfs4_client *clp) |
335 | { | |
d84f4f99 | 336 | const struct cred *original_cred; |
0ce0c2b5 | 337 | struct nfs4_client_reclaim *crp; |
2216d449 | 338 | char dname[HEXDIR_LEN]; |
c7b9a459 | 339 | int status; |
52e19c09 | 340 | struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); |
c7b9a459 | 341 | |
3a073369 | 342 | if (!nn->rec_file || !test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) |
c7b9a459 N |
343 | return; |
344 | ||
2216d449 JL |
345 | status = nfs4_make_rec_clidname(dname, &clp->cl_name); |
346 | if (status) | |
7255e716 | 347 | return legacy_recdir_name_error(clp, status); |
2216d449 | 348 | |
3a073369 | 349 | status = mnt_want_write_file(nn->rec_file); |
0622753b DH |
350 | if (status) |
351 | goto out; | |
a52d726b | 352 | clear_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags); |
d84f4f99 DH |
353 | |
354 | status = nfs4_save_creds(&original_cred); | |
355 | if (status < 0) | |
698d8d87 | 356 | goto out_drop_write; |
d84f4f99 | 357 | |
3a073369 | 358 | status = nfsd4_unlink_clid_dir(dname, HEXDIR_LEN-1, nn); |
d84f4f99 | 359 | nfs4_reset_creds(original_cred); |
0ce0c2b5 | 360 | if (status == 0) { |
3a073369 | 361 | vfs_fsync(nn->rec_file, 0); |
f141f79d | 362 | if (nn->in_grace) { |
0ce0c2b5 | 363 | /* remove reclaim record */ |
52e19c09 | 364 | crp = nfsd4_find_reclaim_client(dname, nn); |
0ce0c2b5 | 365 | if (crp) |
52e19c09 | 366 | nfs4_remove_reclaim_record(crp, nn); |
0ce0c2b5 JL |
367 | } |
368 | } | |
698d8d87 | 369 | out_drop_write: |
3a073369 | 370 | mnt_drop_write_file(nn->rec_file); |
0622753b | 371 | out: |
c7b9a459 N |
372 | if (status) |
373 | printk("NFSD: Failed to remove expired client state directory" | |
2216d449 | 374 | " %.*s\n", HEXDIR_LEN, dname); |
c7b9a459 N |
375 | } |
376 | ||
377 | static int | |
52e19c09 | 378 | purge_old(struct dentry *parent, struct dentry *child, struct nfsd_net *nn) |
c7b9a459 N |
379 | { |
380 | int status; | |
381 | ||
52e19c09 | 382 | if (nfs4_has_reclaimed_state(child->d_name.name, nn)) |
b37ad28b | 383 | return 0; |
c7b9a459 | 384 | |
2f9092e1 | 385 | status = vfs_rmdir(parent->d_inode, child); |
c7b9a459 N |
386 | if (status) |
387 | printk("failed to remove client recovery directory %s\n", | |
388 | child->d_name.name); | |
389 | /* Keep trying, success or failure: */ | |
b37ad28b | 390 | return 0; |
c7b9a459 N |
391 | } |
392 | ||
2a4317c5 | 393 | static void |
12760c66 | 394 | nfsd4_recdir_purge_old(struct nfsd_net *nn, time_t boot_time) |
2a4317c5 | 395 | { |
c7b9a459 N |
396 | int status; |
397 | ||
f141f79d | 398 | nn->in_grace = false; |
3a073369 | 399 | if (!nn->rec_file) |
c7b9a459 | 400 | return; |
3a073369 | 401 | status = mnt_want_write_file(nn->rec_file); |
0622753b DH |
402 | if (status) |
403 | goto out; | |
52e19c09 | 404 | status = nfsd4_list_rec_dir(purge_old, nn); |
c7b9a459 | 405 | if (status == 0) |
3a073369 SK |
406 | vfs_fsync(nn->rec_file, 0); |
407 | mnt_drop_write_file(nn->rec_file); | |
0622753b | 408 | out: |
52e19c09 | 409 | nfs4_release_reclaim(nn); |
c7b9a459 N |
410 | if (status) |
411 | printk("nfsd4: failed to purge old clients from recovery" | |
3a073369 | 412 | " directory %s\n", nn->rec_file->f_path.dentry->d_name.name); |
c7b9a459 N |
413 | } |
414 | ||
190e4fbf | 415 | static int |
52e19c09 | 416 | load_recdir(struct dentry *parent, struct dentry *child, struct nfsd_net *nn) |
190e4fbf N |
417 | { |
418 | if (child->d_name.len != HEXDIR_LEN - 1) { | |
419 | printk("nfsd4: illegal name %s in recovery directory\n", | |
420 | child->d_name.name); | |
421 | /* Keep trying; maybe the others are OK: */ | |
b37ad28b | 422 | return 0; |
190e4fbf | 423 | } |
52e19c09 | 424 | nfs4_client_to_reclaim(child->d_name.name, nn); |
b37ad28b | 425 | return 0; |
190e4fbf N |
426 | } |
427 | ||
2a4317c5 | 428 | static int |
52e19c09 | 429 | nfsd4_recdir_load(struct net *net) { |
190e4fbf | 430 | int status; |
52e19c09 | 431 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
190e4fbf | 432 | |
3a073369 | 433 | if (!nn->rec_file) |
e970a573 CH |
434 | return 0; |
435 | ||
52e19c09 | 436 | status = nfsd4_list_rec_dir(load_recdir, nn); |
190e4fbf N |
437 | if (status) |
438 | printk("nfsd4: failed loading clients from recovery" | |
3a073369 | 439 | " directory %s\n", nn->rec_file->f_path.dentry->d_name.name); |
190e4fbf N |
440 | return status; |
441 | } | |
442 | ||
443 | /* | |
444 | * Hold reference to the recovery directory. | |
445 | */ | |
446 | ||
2a4317c5 | 447 | static int |
3a073369 | 448 | nfsd4_init_recdir(struct net *net) |
190e4fbf | 449 | { |
3a073369 | 450 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
d84f4f99 DH |
451 | const struct cred *original_cred; |
452 | int status; | |
190e4fbf N |
453 | |
454 | printk("NFSD: Using %s as the NFSv4 state recovery directory\n", | |
48483bf2 | 455 | user_recovery_dirname); |
190e4fbf | 456 | |
3a073369 | 457 | BUG_ON(nn->rec_file); |
190e4fbf | 458 | |
d84f4f99 DH |
459 | status = nfs4_save_creds(&original_cred); |
460 | if (status < 0) { | |
461 | printk("NFSD: Unable to change credentials to find recovery" | |
462 | " directory: error %d\n", | |
463 | status); | |
2a4317c5 | 464 | return status; |
d84f4f99 | 465 | } |
190e4fbf | 466 | |
3a073369 SK |
467 | nn->rec_file = filp_open(user_recovery_dirname, O_RDONLY | O_DIRECTORY, 0); |
468 | if (IS_ERR(nn->rec_file)) { | |
c2642ab0 | 469 | printk("NFSD: unable to find recovery directory %s\n", |
48483bf2 | 470 | user_recovery_dirname); |
3a073369 SK |
471 | status = PTR_ERR(nn->rec_file); |
472 | nn->rec_file = NULL; | |
e970a573 | 473 | } |
190e4fbf | 474 | |
d84f4f99 | 475 | nfs4_reset_creds(original_cred); |
0ce0c2b5 | 476 | if (!status) |
f141f79d | 477 | nn->in_grace = true; |
2a4317c5 | 478 | return status; |
190e4fbf N |
479 | } |
480 | ||
52e19c09 SK |
481 | |
482 | static int | |
483 | nfs4_legacy_state_init(struct net *net) | |
484 | { | |
485 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); | |
486 | int i; | |
487 | ||
488 | nn->reclaim_str_hashtbl = kmalloc(sizeof(struct list_head) * | |
489 | CLIENT_HASH_SIZE, GFP_KERNEL); | |
490 | if (!nn->reclaim_str_hashtbl) | |
491 | return -ENOMEM; | |
492 | ||
493 | for (i = 0; i < CLIENT_HASH_SIZE; i++) | |
494 | INIT_LIST_HEAD(&nn->reclaim_str_hashtbl[i]); | |
495 | nn->reclaim_str_hashtbl_size = 0; | |
496 | ||
497 | return 0; | |
498 | } | |
499 | ||
500 | static void | |
501 | nfs4_legacy_state_shutdown(struct net *net) | |
502 | { | |
503 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); | |
504 | ||
505 | kfree(nn->reclaim_str_hashtbl); | |
506 | } | |
507 | ||
2a4317c5 JL |
508 | static int |
509 | nfsd4_load_reboot_recovery_data(struct net *net) | |
510 | { | |
511 | int status; | |
512 | ||
3a073369 | 513 | status = nfsd4_init_recdir(net); |
52e19c09 SK |
514 | if (!status) |
515 | status = nfsd4_recdir_load(net); | |
52e19c09 SK |
516 | if (status) |
517 | printk(KERN_ERR "NFSD: Failure reading reboot recovery data\n"); | |
518 | return status; | |
519 | } | |
520 | ||
521 | static int | |
522 | nfsd4_legacy_tracking_init(struct net *net) | |
523 | { | |
524 | int status; | |
525 | ||
cc27e0d4 JL |
526 | /* XXX: The legacy code won't work in a container */ |
527 | if (net != &init_net) { | |
528 | WARN(1, KERN_ERR "NFSD: attempt to initialize legacy client " | |
529 | "tracking in a container!\n"); | |
530 | return -EINVAL; | |
531 | } | |
532 | ||
52e19c09 | 533 | status = nfs4_legacy_state_init(net); |
2a4317c5 | 534 | if (status) |
52e19c09 SK |
535 | return status; |
536 | ||
537 | status = nfsd4_load_reboot_recovery_data(net); | |
538 | if (status) | |
539 | goto err; | |
540 | return 0; | |
541 | ||
542 | err: | |
543 | nfs4_legacy_state_shutdown(net); | |
2a4317c5 JL |
544 | return status; |
545 | } | |
546 | ||
547 | static void | |
3a073369 | 548 | nfsd4_shutdown_recdir(struct nfsd_net *nn) |
190e4fbf | 549 | { |
3a073369 | 550 | if (!nn->rec_file) |
190e4fbf | 551 | return; |
3a073369 SK |
552 | fput(nn->rec_file); |
553 | nn->rec_file = NULL; | |
190e4fbf | 554 | } |
48483bf2 | 555 | |
2a4317c5 JL |
556 | static void |
557 | nfsd4_legacy_tracking_exit(struct net *net) | |
558 | { | |
52e19c09 SK |
559 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
560 | ||
561 | nfs4_release_reclaim(nn); | |
3a073369 | 562 | nfsd4_shutdown_recdir(nn); |
52e19c09 | 563 | nfs4_legacy_state_shutdown(net); |
2a4317c5 JL |
564 | } |
565 | ||
48483bf2 BF |
566 | /* |
567 | * Change the NFSv4 recovery directory to recdir. | |
568 | */ | |
569 | int | |
570 | nfs4_reset_recoverydir(char *recdir) | |
571 | { | |
572 | int status; | |
573 | struct path path; | |
574 | ||
575 | status = kern_path(recdir, LOOKUP_FOLLOW, &path); | |
576 | if (status) | |
577 | return status; | |
578 | status = -ENOTDIR; | |
579 | if (S_ISDIR(path.dentry->d_inode->i_mode)) { | |
580 | strcpy(user_recovery_dirname, recdir); | |
581 | status = 0; | |
582 | } | |
583 | path_put(&path); | |
584 | return status; | |
585 | } | |
586 | ||
587 | char * | |
588 | nfs4_recoverydir(void) | |
589 | { | |
590 | return user_recovery_dirname; | |
591 | } | |
2a4317c5 JL |
592 | |
593 | static int | |
594 | nfsd4_check_legacy_client(struct nfs4_client *clp) | |
595 | { | |
2216d449 JL |
596 | int status; |
597 | char dname[HEXDIR_LEN]; | |
0ce0c2b5 | 598 | struct nfs4_client_reclaim *crp; |
52e19c09 | 599 | struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); |
0ce0c2b5 | 600 | |
2a4317c5 JL |
601 | /* did we already find that this client is stable? */ |
602 | if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) | |
603 | return 0; | |
604 | ||
2216d449 JL |
605 | status = nfs4_make_rec_clidname(dname, &clp->cl_name); |
606 | if (status) { | |
7255e716 | 607 | legacy_recdir_name_error(clp, status); |
2216d449 JL |
608 | return status; |
609 | } | |
610 | ||
2a4317c5 | 611 | /* look for it in the reclaim hashtable otherwise */ |
52e19c09 | 612 | crp = nfsd4_find_reclaim_client(dname, nn); |
0ce0c2b5 | 613 | if (crp) { |
2a4317c5 | 614 | set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags); |
0ce0c2b5 | 615 | crp->cr_clp = clp; |
2a4317c5 JL |
616 | return 0; |
617 | } | |
618 | ||
619 | return -ENOENT; | |
620 | } | |
621 | ||
622 | static struct nfsd4_client_tracking_ops nfsd4_legacy_tracking_ops = { | |
52e19c09 | 623 | .init = nfsd4_legacy_tracking_init, |
2a4317c5 JL |
624 | .exit = nfsd4_legacy_tracking_exit, |
625 | .create = nfsd4_create_clid_dir, | |
626 | .remove = nfsd4_remove_clid_dir, | |
627 | .check = nfsd4_check_legacy_client, | |
628 | .grace_done = nfsd4_recdir_purge_old, | |
629 | }; | |
630 | ||
f3f80148 JL |
631 | /* Globals */ |
632 | #define NFSD_PIPE_DIR "nfsd" | |
633 | #define NFSD_CLD_PIPE "cld" | |
634 | ||
635 | /* per-net-ns structure for holding cld upcall info */ | |
636 | struct cld_net { | |
637 | struct rpc_pipe *cn_pipe; | |
638 | spinlock_t cn_lock; | |
639 | struct list_head cn_list; | |
640 | unsigned int cn_xid; | |
641 | }; | |
642 | ||
643 | struct cld_upcall { | |
644 | struct list_head cu_list; | |
645 | struct cld_net *cu_net; | |
646 | struct task_struct *cu_task; | |
647 | struct cld_msg cu_msg; | |
648 | }; | |
649 | ||
650 | static int | |
651 | __cld_pipe_upcall(struct rpc_pipe *pipe, struct cld_msg *cmsg) | |
652 | { | |
653 | int ret; | |
654 | struct rpc_pipe_msg msg; | |
655 | ||
656 | memset(&msg, 0, sizeof(msg)); | |
657 | msg.data = cmsg; | |
658 | msg.len = sizeof(*cmsg); | |
659 | ||
660 | /* | |
661 | * Set task state before we queue the upcall. That prevents | |
662 | * wake_up_process in the downcall from racing with schedule. | |
663 | */ | |
664 | set_current_state(TASK_UNINTERRUPTIBLE); | |
665 | ret = rpc_queue_upcall(pipe, &msg); | |
666 | if (ret < 0) { | |
667 | set_current_state(TASK_RUNNING); | |
668 | goto out; | |
669 | } | |
670 | ||
671 | schedule(); | |
672 | set_current_state(TASK_RUNNING); | |
673 | ||
674 | if (msg.errno < 0) | |
675 | ret = msg.errno; | |
676 | out: | |
677 | return ret; | |
678 | } | |
679 | ||
680 | static int | |
681 | cld_pipe_upcall(struct rpc_pipe *pipe, struct cld_msg *cmsg) | |
682 | { | |
683 | int ret; | |
684 | ||
685 | /* | |
686 | * -EAGAIN occurs when pipe is closed and reopened while there are | |
687 | * upcalls queued. | |
688 | */ | |
689 | do { | |
690 | ret = __cld_pipe_upcall(pipe, cmsg); | |
691 | } while (ret == -EAGAIN); | |
692 | ||
693 | return ret; | |
694 | } | |
695 | ||
696 | static ssize_t | |
697 | cld_pipe_downcall(struct file *filp, const char __user *src, size_t mlen) | |
698 | { | |
699 | struct cld_upcall *tmp, *cup; | |
bc1b542b | 700 | struct cld_msg __user *cmsg = (struct cld_msg __user *)src; |
f3f80148 JL |
701 | uint32_t xid; |
702 | struct nfsd_net *nn = net_generic(filp->f_dentry->d_sb->s_fs_info, | |
703 | nfsd_net_id); | |
704 | struct cld_net *cn = nn->cld_net; | |
705 | ||
706 | if (mlen != sizeof(*cmsg)) { | |
8a7dc4b0 | 707 | dprintk("%s: got %zu bytes, expected %zu\n", __func__, mlen, |
f3f80148 JL |
708 | sizeof(*cmsg)); |
709 | return -EINVAL; | |
710 | } | |
711 | ||
712 | /* copy just the xid so we can try to find that */ | |
713 | if (copy_from_user(&xid, &cmsg->cm_xid, sizeof(xid)) != 0) { | |
714 | dprintk("%s: error when copying xid from userspace", __func__); | |
715 | return -EFAULT; | |
716 | } | |
717 | ||
718 | /* walk the list and find corresponding xid */ | |
719 | cup = NULL; | |
720 | spin_lock(&cn->cn_lock); | |
721 | list_for_each_entry(tmp, &cn->cn_list, cu_list) { | |
722 | if (get_unaligned(&tmp->cu_msg.cm_xid) == xid) { | |
723 | cup = tmp; | |
724 | list_del_init(&cup->cu_list); | |
725 | break; | |
726 | } | |
727 | } | |
728 | spin_unlock(&cn->cn_lock); | |
729 | ||
730 | /* couldn't find upcall? */ | |
731 | if (!cup) { | |
21f72c9f | 732 | dprintk("%s: couldn't find upcall -- xid=%u\n", __func__, xid); |
f3f80148 JL |
733 | return -EINVAL; |
734 | } | |
735 | ||
736 | if (copy_from_user(&cup->cu_msg, src, mlen) != 0) | |
737 | return -EFAULT; | |
738 | ||
739 | wake_up_process(cup->cu_task); | |
740 | return mlen; | |
741 | } | |
742 | ||
743 | static void | |
744 | cld_pipe_destroy_msg(struct rpc_pipe_msg *msg) | |
745 | { | |
746 | struct cld_msg *cmsg = msg->data; | |
747 | struct cld_upcall *cup = container_of(cmsg, struct cld_upcall, | |
748 | cu_msg); | |
749 | ||
750 | /* errno >= 0 means we got a downcall */ | |
751 | if (msg->errno >= 0) | |
752 | return; | |
753 | ||
754 | wake_up_process(cup->cu_task); | |
755 | } | |
756 | ||
757 | static const struct rpc_pipe_ops cld_upcall_ops = { | |
758 | .upcall = rpc_pipe_generic_upcall, | |
759 | .downcall = cld_pipe_downcall, | |
760 | .destroy_msg = cld_pipe_destroy_msg, | |
761 | }; | |
762 | ||
763 | static struct dentry * | |
764 | nfsd4_cld_register_sb(struct super_block *sb, struct rpc_pipe *pipe) | |
765 | { | |
766 | struct dentry *dir, *dentry; | |
767 | ||
768 | dir = rpc_d_lookup_sb(sb, NFSD_PIPE_DIR); | |
769 | if (dir == NULL) | |
770 | return ERR_PTR(-ENOENT); | |
771 | dentry = rpc_mkpipe_dentry(dir, NFSD_CLD_PIPE, NULL, pipe); | |
772 | dput(dir); | |
773 | return dentry; | |
774 | } | |
775 | ||
776 | static void | |
777 | nfsd4_cld_unregister_sb(struct rpc_pipe *pipe) | |
778 | { | |
779 | if (pipe->dentry) | |
780 | rpc_unlink(pipe->dentry); | |
781 | } | |
782 | ||
783 | static struct dentry * | |
784 | nfsd4_cld_register_net(struct net *net, struct rpc_pipe *pipe) | |
785 | { | |
786 | struct super_block *sb; | |
787 | struct dentry *dentry; | |
788 | ||
789 | sb = rpc_get_sb_net(net); | |
790 | if (!sb) | |
791 | return NULL; | |
792 | dentry = nfsd4_cld_register_sb(sb, pipe); | |
793 | rpc_put_sb_net(net); | |
794 | return dentry; | |
795 | } | |
796 | ||
797 | static void | |
798 | nfsd4_cld_unregister_net(struct net *net, struct rpc_pipe *pipe) | |
799 | { | |
800 | struct super_block *sb; | |
801 | ||
802 | sb = rpc_get_sb_net(net); | |
803 | if (sb) { | |
804 | nfsd4_cld_unregister_sb(pipe); | |
805 | rpc_put_sb_net(net); | |
806 | } | |
807 | } | |
808 | ||
809 | /* Initialize rpc_pipefs pipe for communication with client tracking daemon */ | |
810 | static int | |
811 | nfsd4_init_cld_pipe(struct net *net) | |
812 | { | |
813 | int ret; | |
814 | struct dentry *dentry; | |
815 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); | |
816 | struct cld_net *cn; | |
817 | ||
818 | if (nn->cld_net) | |
819 | return 0; | |
820 | ||
821 | cn = kzalloc(sizeof(*cn), GFP_KERNEL); | |
822 | if (!cn) { | |
823 | ret = -ENOMEM; | |
824 | goto err; | |
825 | } | |
826 | ||
827 | cn->cn_pipe = rpc_mkpipe_data(&cld_upcall_ops, RPC_PIPE_WAIT_FOR_OPEN); | |
828 | if (IS_ERR(cn->cn_pipe)) { | |
829 | ret = PTR_ERR(cn->cn_pipe); | |
830 | goto err; | |
831 | } | |
832 | spin_lock_init(&cn->cn_lock); | |
833 | INIT_LIST_HEAD(&cn->cn_list); | |
834 | ||
835 | dentry = nfsd4_cld_register_net(net, cn->cn_pipe); | |
836 | if (IS_ERR(dentry)) { | |
837 | ret = PTR_ERR(dentry); | |
838 | goto err_destroy_data; | |
839 | } | |
840 | ||
841 | cn->cn_pipe->dentry = dentry; | |
842 | nn->cld_net = cn; | |
843 | return 0; | |
844 | ||
845 | err_destroy_data: | |
846 | rpc_destroy_pipe_data(cn->cn_pipe); | |
847 | err: | |
848 | kfree(cn); | |
849 | printk(KERN_ERR "NFSD: unable to create nfsdcld upcall pipe (%d)\n", | |
850 | ret); | |
851 | return ret; | |
852 | } | |
853 | ||
854 | static void | |
855 | nfsd4_remove_cld_pipe(struct net *net) | |
856 | { | |
857 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); | |
858 | struct cld_net *cn = nn->cld_net; | |
859 | ||
860 | nfsd4_cld_unregister_net(net, cn->cn_pipe); | |
861 | rpc_destroy_pipe_data(cn->cn_pipe); | |
862 | kfree(nn->cld_net); | |
863 | nn->cld_net = NULL; | |
864 | } | |
865 | ||
866 | static struct cld_upcall * | |
867 | alloc_cld_upcall(struct cld_net *cn) | |
868 | { | |
869 | struct cld_upcall *new, *tmp; | |
870 | ||
871 | new = kzalloc(sizeof(*new), GFP_KERNEL); | |
872 | if (!new) | |
873 | return new; | |
874 | ||
875 | /* FIXME: hard cap on number in flight? */ | |
876 | restart_search: | |
877 | spin_lock(&cn->cn_lock); | |
878 | list_for_each_entry(tmp, &cn->cn_list, cu_list) { | |
879 | if (tmp->cu_msg.cm_xid == cn->cn_xid) { | |
880 | cn->cn_xid++; | |
881 | spin_unlock(&cn->cn_lock); | |
882 | goto restart_search; | |
883 | } | |
884 | } | |
885 | new->cu_task = current; | |
886 | new->cu_msg.cm_vers = CLD_UPCALL_VERSION; | |
887 | put_unaligned(cn->cn_xid++, &new->cu_msg.cm_xid); | |
888 | new->cu_net = cn; | |
889 | list_add(&new->cu_list, &cn->cn_list); | |
890 | spin_unlock(&cn->cn_lock); | |
891 | ||
892 | dprintk("%s: allocated xid %u\n", __func__, new->cu_msg.cm_xid); | |
893 | ||
894 | return new; | |
895 | } | |
896 | ||
897 | static void | |
898 | free_cld_upcall(struct cld_upcall *victim) | |
899 | { | |
900 | struct cld_net *cn = victim->cu_net; | |
901 | ||
902 | spin_lock(&cn->cn_lock); | |
903 | list_del(&victim->cu_list); | |
904 | spin_unlock(&cn->cn_lock); | |
905 | kfree(victim); | |
906 | } | |
907 | ||
908 | /* Ask daemon to create a new record */ | |
909 | static void | |
910 | nfsd4_cld_create(struct nfs4_client *clp) | |
911 | { | |
912 | int ret; | |
913 | struct cld_upcall *cup; | |
c212cecf | 914 | struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); |
f3f80148 JL |
915 | struct cld_net *cn = nn->cld_net; |
916 | ||
917 | /* Don't upcall if it's already stored */ | |
918 | if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) | |
919 | return; | |
920 | ||
921 | cup = alloc_cld_upcall(cn); | |
922 | if (!cup) { | |
923 | ret = -ENOMEM; | |
924 | goto out_err; | |
925 | } | |
926 | ||
927 | cup->cu_msg.cm_cmd = Cld_Create; | |
928 | cup->cu_msg.cm_u.cm_name.cn_len = clp->cl_name.len; | |
929 | memcpy(cup->cu_msg.cm_u.cm_name.cn_id, clp->cl_name.data, | |
930 | clp->cl_name.len); | |
931 | ||
932 | ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_msg); | |
933 | if (!ret) { | |
934 | ret = cup->cu_msg.cm_status; | |
935 | set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags); | |
936 | } | |
937 | ||
938 | free_cld_upcall(cup); | |
939 | out_err: | |
940 | if (ret) | |
941 | printk(KERN_ERR "NFSD: Unable to create client " | |
942 | "record on stable storage: %d\n", ret); | |
943 | } | |
944 | ||
945 | /* Ask daemon to create a new record */ | |
946 | static void | |
947 | nfsd4_cld_remove(struct nfs4_client *clp) | |
948 | { | |
949 | int ret; | |
950 | struct cld_upcall *cup; | |
c212cecf | 951 | struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); |
f3f80148 JL |
952 | struct cld_net *cn = nn->cld_net; |
953 | ||
954 | /* Don't upcall if it's already removed */ | |
955 | if (!test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) | |
956 | return; | |
957 | ||
958 | cup = alloc_cld_upcall(cn); | |
959 | if (!cup) { | |
960 | ret = -ENOMEM; | |
961 | goto out_err; | |
962 | } | |
963 | ||
964 | cup->cu_msg.cm_cmd = Cld_Remove; | |
965 | cup->cu_msg.cm_u.cm_name.cn_len = clp->cl_name.len; | |
966 | memcpy(cup->cu_msg.cm_u.cm_name.cn_id, clp->cl_name.data, | |
967 | clp->cl_name.len); | |
968 | ||
969 | ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_msg); | |
970 | if (!ret) { | |
971 | ret = cup->cu_msg.cm_status; | |
972 | clear_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags); | |
973 | } | |
974 | ||
975 | free_cld_upcall(cup); | |
976 | out_err: | |
977 | if (ret) | |
978 | printk(KERN_ERR "NFSD: Unable to remove client " | |
979 | "record from stable storage: %d\n", ret); | |
980 | } | |
981 | ||
982 | /* Check for presence of a record, and update its timestamp */ | |
983 | static int | |
984 | nfsd4_cld_check(struct nfs4_client *clp) | |
985 | { | |
986 | int ret; | |
987 | struct cld_upcall *cup; | |
c212cecf | 988 | struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); |
f3f80148 JL |
989 | struct cld_net *cn = nn->cld_net; |
990 | ||
991 | /* Don't upcall if one was already stored during this grace pd */ | |
992 | if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) | |
993 | return 0; | |
994 | ||
995 | cup = alloc_cld_upcall(cn); | |
996 | if (!cup) { | |
997 | printk(KERN_ERR "NFSD: Unable to check client record on " | |
998 | "stable storage: %d\n", -ENOMEM); | |
999 | return -ENOMEM; | |
1000 | } | |
1001 | ||
1002 | cup->cu_msg.cm_cmd = Cld_Check; | |
1003 | cup->cu_msg.cm_u.cm_name.cn_len = clp->cl_name.len; | |
1004 | memcpy(cup->cu_msg.cm_u.cm_name.cn_id, clp->cl_name.data, | |
1005 | clp->cl_name.len); | |
1006 | ||
1007 | ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_msg); | |
1008 | if (!ret) { | |
1009 | ret = cup->cu_msg.cm_status; | |
1010 | set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags); | |
1011 | } | |
1012 | ||
1013 | free_cld_upcall(cup); | |
1014 | return ret; | |
1015 | } | |
1016 | ||
1017 | static void | |
12760c66 | 1018 | nfsd4_cld_grace_done(struct nfsd_net *nn, time_t boot_time) |
f3f80148 JL |
1019 | { |
1020 | int ret; | |
1021 | struct cld_upcall *cup; | |
f3f80148 JL |
1022 | struct cld_net *cn = nn->cld_net; |
1023 | ||
1024 | cup = alloc_cld_upcall(cn); | |
1025 | if (!cup) { | |
1026 | ret = -ENOMEM; | |
1027 | goto out_err; | |
1028 | } | |
1029 | ||
1030 | cup->cu_msg.cm_cmd = Cld_GraceDone; | |
1031 | cup->cu_msg.cm_u.cm_gracetime = (int64_t)boot_time; | |
1032 | ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_msg); | |
1033 | if (!ret) | |
1034 | ret = cup->cu_msg.cm_status; | |
1035 | ||
1036 | free_cld_upcall(cup); | |
1037 | out_err: | |
1038 | if (ret) | |
1039 | printk(KERN_ERR "NFSD: Unable to end grace period: %d\n", ret); | |
1040 | } | |
1041 | ||
1042 | static struct nfsd4_client_tracking_ops nfsd4_cld_tracking_ops = { | |
1043 | .init = nfsd4_init_cld_pipe, | |
1044 | .exit = nfsd4_remove_cld_pipe, | |
1045 | .create = nfsd4_cld_create, | |
1046 | .remove = nfsd4_cld_remove, | |
1047 | .check = nfsd4_cld_check, | |
1048 | .grace_done = nfsd4_cld_grace_done, | |
1049 | }; | |
1050 | ||
2873d214 JL |
1051 | /* upcall via usermodehelper */ |
1052 | static char cltrack_prog[PATH_MAX] = "/sbin/nfsdcltrack"; | |
1053 | module_param_string(cltrack_prog, cltrack_prog, sizeof(cltrack_prog), | |
1054 | S_IRUGO|S_IWUSR); | |
1055 | MODULE_PARM_DESC(cltrack_prog, "Path to the nfsdcltrack upcall program"); | |
1056 | ||
f3aa7e24 JL |
1057 | static bool cltrack_legacy_disable; |
1058 | module_param(cltrack_legacy_disable, bool, S_IRUGO|S_IWUSR); | |
1059 | MODULE_PARM_DESC(cltrack_legacy_disable, | |
1060 | "Disable legacy recoverydir conversion. Default: false"); | |
1061 | ||
1062 | #define LEGACY_TOPDIR_ENV_PREFIX "NFSDCLTRACK_LEGACY_TOPDIR=" | |
1063 | #define LEGACY_RECDIR_ENV_PREFIX "NFSDCLTRACK_LEGACY_RECDIR=" | |
1064 | ||
1065 | static char * | |
1066 | nfsd4_cltrack_legacy_topdir(void) | |
1067 | { | |
1068 | int copied; | |
1069 | size_t len; | |
1070 | char *result; | |
1071 | ||
1072 | if (cltrack_legacy_disable) | |
1073 | return NULL; | |
1074 | ||
1075 | len = strlen(LEGACY_TOPDIR_ENV_PREFIX) + | |
1076 | strlen(nfs4_recoverydir()) + 1; | |
1077 | ||
1078 | result = kmalloc(len, GFP_KERNEL); | |
1079 | if (!result) | |
1080 | return result; | |
1081 | ||
1082 | copied = snprintf(result, len, LEGACY_TOPDIR_ENV_PREFIX "%s", | |
1083 | nfs4_recoverydir()); | |
1084 | if (copied >= len) { | |
1085 | /* just return nothing if output was truncated */ | |
1086 | kfree(result); | |
1087 | return NULL; | |
1088 | } | |
1089 | ||
1090 | return result; | |
1091 | } | |
1092 | ||
1093 | static char * | |
2216d449 | 1094 | nfsd4_cltrack_legacy_recdir(const struct xdr_netobj *name) |
f3aa7e24 JL |
1095 | { |
1096 | int copied; | |
1097 | size_t len; | |
1098 | char *result; | |
1099 | ||
1100 | if (cltrack_legacy_disable) | |
1101 | return NULL; | |
1102 | ||
1103 | /* +1 is for '/' between "topdir" and "recdir" */ | |
1104 | len = strlen(LEGACY_RECDIR_ENV_PREFIX) + | |
1105 | strlen(nfs4_recoverydir()) + 1 + HEXDIR_LEN; | |
1106 | ||
1107 | result = kmalloc(len, GFP_KERNEL); | |
1108 | if (!result) | |
1109 | return result; | |
1110 | ||
2216d449 JL |
1111 | copied = snprintf(result, len, LEGACY_RECDIR_ENV_PREFIX "%s/", |
1112 | nfs4_recoverydir()); | |
1113 | if (copied > (len - HEXDIR_LEN)) { | |
1114 | /* just return nothing if output will be truncated */ | |
1115 | kfree(result); | |
1116 | return NULL; | |
1117 | } | |
1118 | ||
1119 | copied = nfs4_make_rec_clidname(result + copied, name); | |
1120 | if (copied) { | |
f3aa7e24 JL |
1121 | kfree(result); |
1122 | return NULL; | |
1123 | } | |
1124 | ||
1125 | return result; | |
1126 | } | |
1127 | ||
2873d214 | 1128 | static int |
f3aa7e24 | 1129 | nfsd4_umh_cltrack_upcall(char *cmd, char *arg, char *legacy) |
2873d214 | 1130 | { |
f3aa7e24 | 1131 | char *envp[2]; |
2873d214 JL |
1132 | char *argv[4]; |
1133 | int ret; | |
1134 | ||
1135 | if (unlikely(!cltrack_prog[0])) { | |
1136 | dprintk("%s: cltrack_prog is disabled\n", __func__); | |
1137 | return -EACCES; | |
1138 | } | |
1139 | ||
1140 | dprintk("%s: cmd: %s\n", __func__, cmd); | |
1141 | dprintk("%s: arg: %s\n", __func__, arg ? arg : "(null)"); | |
f3aa7e24 JL |
1142 | dprintk("%s: legacy: %s\n", __func__, legacy ? legacy : "(null)"); |
1143 | ||
1144 | envp[0] = legacy; | |
1145 | envp[1] = NULL; | |
2873d214 JL |
1146 | |
1147 | argv[0] = (char *)cltrack_prog; | |
1148 | argv[1] = cmd; | |
1149 | argv[2] = arg; | |
1150 | argv[3] = NULL; | |
1151 | ||
1152 | ret = call_usermodehelper(argv[0], argv, envp, UMH_WAIT_PROC); | |
1153 | /* | |
1154 | * Disable the upcall mechanism if we're getting an ENOENT or EACCES | |
1155 | * error. The admin can re-enable it on the fly by using sysfs | |
1156 | * once the problem has been fixed. | |
1157 | */ | |
1158 | if (ret == -ENOENT || ret == -EACCES) { | |
1159 | dprintk("NFSD: %s was not found or isn't executable (%d). " | |
1160 | "Setting cltrack_prog to blank string!", | |
1161 | cltrack_prog, ret); | |
1162 | cltrack_prog[0] = '\0'; | |
1163 | } | |
1164 | dprintk("%s: %s return value: %d\n", __func__, cltrack_prog, ret); | |
1165 | ||
1166 | return ret; | |
1167 | } | |
1168 | ||
1169 | static char * | |
1170 | bin_to_hex_dup(const unsigned char *src, int srclen) | |
1171 | { | |
1172 | int i; | |
1173 | char *buf, *hex; | |
1174 | ||
1175 | /* +1 for terminating NULL */ | |
1176 | buf = kmalloc((srclen * 2) + 1, GFP_KERNEL); | |
1177 | if (!buf) | |
1178 | return buf; | |
1179 | ||
1180 | hex = buf; | |
1181 | for (i = 0; i < srclen; i++) { | |
1182 | sprintf(hex, "%2.2x", *src++); | |
1183 | hex += 2; | |
1184 | } | |
1185 | return buf; | |
1186 | } | |
1187 | ||
1188 | static int | |
1189 | nfsd4_umh_cltrack_init(struct net __attribute__((unused)) *net) | |
1190 | { | |
71a50306 SK |
1191 | /* XXX: The usermode helper s not working in container yet. */ |
1192 | if (net != &init_net) { | |
1193 | WARN(1, KERN_ERR "NFSD: attempt to initialize umh client " | |
1194 | "tracking in a container!\n"); | |
1195 | return -EINVAL; | |
1196 | } | |
f3aa7e24 | 1197 | return nfsd4_umh_cltrack_upcall("init", NULL, NULL); |
2873d214 JL |
1198 | } |
1199 | ||
1200 | static void | |
1201 | nfsd4_umh_cltrack_create(struct nfs4_client *clp) | |
1202 | { | |
1203 | char *hexid; | |
1204 | ||
1205 | hexid = bin_to_hex_dup(clp->cl_name.data, clp->cl_name.len); | |
1206 | if (!hexid) { | |
1207 | dprintk("%s: can't allocate memory for upcall!\n", __func__); | |
1208 | return; | |
1209 | } | |
f3aa7e24 | 1210 | nfsd4_umh_cltrack_upcall("create", hexid, NULL); |
2873d214 JL |
1211 | kfree(hexid); |
1212 | } | |
1213 | ||
1214 | static void | |
1215 | nfsd4_umh_cltrack_remove(struct nfs4_client *clp) | |
1216 | { | |
1217 | char *hexid; | |
1218 | ||
1219 | hexid = bin_to_hex_dup(clp->cl_name.data, clp->cl_name.len); | |
1220 | if (!hexid) { | |
1221 | dprintk("%s: can't allocate memory for upcall!\n", __func__); | |
1222 | return; | |
1223 | } | |
f3aa7e24 | 1224 | nfsd4_umh_cltrack_upcall("remove", hexid, NULL); |
2873d214 JL |
1225 | kfree(hexid); |
1226 | } | |
1227 | ||
1228 | static int | |
1229 | nfsd4_umh_cltrack_check(struct nfs4_client *clp) | |
1230 | { | |
1231 | int ret; | |
f3aa7e24 | 1232 | char *hexid, *legacy; |
2873d214 JL |
1233 | |
1234 | hexid = bin_to_hex_dup(clp->cl_name.data, clp->cl_name.len); | |
1235 | if (!hexid) { | |
1236 | dprintk("%s: can't allocate memory for upcall!\n", __func__); | |
1237 | return -ENOMEM; | |
1238 | } | |
2216d449 | 1239 | legacy = nfsd4_cltrack_legacy_recdir(&clp->cl_name); |
f3aa7e24 JL |
1240 | ret = nfsd4_umh_cltrack_upcall("check", hexid, legacy); |
1241 | kfree(legacy); | |
2873d214 JL |
1242 | kfree(hexid); |
1243 | return ret; | |
1244 | } | |
1245 | ||
1246 | static void | |
12760c66 | 1247 | nfsd4_umh_cltrack_grace_done(struct nfsd_net __attribute__((unused)) *nn, |
2873d214 JL |
1248 | time_t boot_time) |
1249 | { | |
f3aa7e24 | 1250 | char *legacy; |
2873d214 JL |
1251 | char timestr[22]; /* FIXME: better way to determine max size? */ |
1252 | ||
1253 | sprintf(timestr, "%ld", boot_time); | |
f3aa7e24 JL |
1254 | legacy = nfsd4_cltrack_legacy_topdir(); |
1255 | nfsd4_umh_cltrack_upcall("gracedone", timestr, legacy); | |
1256 | kfree(legacy); | |
2873d214 JL |
1257 | } |
1258 | ||
1259 | static struct nfsd4_client_tracking_ops nfsd4_umh_tracking_ops = { | |
1260 | .init = nfsd4_umh_cltrack_init, | |
1261 | .exit = NULL, | |
1262 | .create = nfsd4_umh_cltrack_create, | |
1263 | .remove = nfsd4_umh_cltrack_remove, | |
1264 | .check = nfsd4_umh_cltrack_check, | |
1265 | .grace_done = nfsd4_umh_cltrack_grace_done, | |
1266 | }; | |
1267 | ||
2a4317c5 JL |
1268 | int |
1269 | nfsd4_client_tracking_init(struct net *net) | |
1270 | { | |
1271 | int status; | |
f3f80148 | 1272 | struct path path; |
9a9c6478 | 1273 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
2a4317c5 | 1274 | |
2d77bf0a | 1275 | /* just run the init if it the method is already decided */ |
9a9c6478 | 1276 | if (nn->client_tracking_ops) |
2d77bf0a JL |
1277 | goto do_init; |
1278 | ||
1279 | /* | |
1280 | * First, try a UMH upcall. It should succeed or fail quickly, so | |
1281 | * there's little harm in trying that first. | |
1282 | */ | |
9a9c6478 SK |
1283 | nn->client_tracking_ops = &nfsd4_umh_tracking_ops; |
1284 | status = nn->client_tracking_ops->init(net); | |
2d77bf0a JL |
1285 | if (!status) |
1286 | return status; | |
1287 | ||
1288 | /* | |
1289 | * See if the recoverydir exists and is a directory. If it is, | |
1290 | * then use the legacy ops. | |
1291 | */ | |
9a9c6478 | 1292 | nn->client_tracking_ops = &nfsd4_legacy_tracking_ops; |
2d77bf0a JL |
1293 | status = kern_path(nfs4_recoverydir(), LOOKUP_FOLLOW, &path); |
1294 | if (!status) { | |
1295 | status = S_ISDIR(path.dentry->d_inode->i_mode); | |
1296 | path_put(&path); | |
1297 | if (status) | |
1298 | goto do_init; | |
f3f80148 | 1299 | } |
2a4317c5 | 1300 | |
2d77bf0a | 1301 | /* Finally, try to use nfsdcld */ |
9a9c6478 | 1302 | nn->client_tracking_ops = &nfsd4_cld_tracking_ops; |
8b0554e9 JL |
1303 | printk(KERN_WARNING "NFSD: the nfsdcld client tracking upcall will be " |
1304 | "removed in 3.10. Please transition to using " | |
1305 | "nfsdcltrack.\n"); | |
2d77bf0a | 1306 | do_init: |
9a9c6478 | 1307 | status = nn->client_tracking_ops->init(net); |
2a4317c5 JL |
1308 | if (status) { |
1309 | printk(KERN_WARNING "NFSD: Unable to initialize client " | |
1310 | "recovery tracking! (%d)\n", status); | |
9a9c6478 | 1311 | nn->client_tracking_ops = NULL; |
2a4317c5 JL |
1312 | } |
1313 | return status; | |
1314 | } | |
1315 | ||
1316 | void | |
1317 | nfsd4_client_tracking_exit(struct net *net) | |
1318 | { | |
9a9c6478 SK |
1319 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
1320 | ||
1321 | if (nn->client_tracking_ops) { | |
1322 | if (nn->client_tracking_ops->exit) | |
1323 | nn->client_tracking_ops->exit(net); | |
1324 | nn->client_tracking_ops = NULL; | |
2a4317c5 JL |
1325 | } |
1326 | } | |
1327 | ||
1328 | void | |
1329 | nfsd4_client_record_create(struct nfs4_client *clp) | |
1330 | { | |
9a9c6478 SK |
1331 | struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); |
1332 | ||
1333 | if (nn->client_tracking_ops) | |
1334 | nn->client_tracking_ops->create(clp); | |
2a4317c5 JL |
1335 | } |
1336 | ||
1337 | void | |
1338 | nfsd4_client_record_remove(struct nfs4_client *clp) | |
1339 | { | |
9a9c6478 SK |
1340 | struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); |
1341 | ||
1342 | if (nn->client_tracking_ops) | |
1343 | nn->client_tracking_ops->remove(clp); | |
2a4317c5 JL |
1344 | } |
1345 | ||
1346 | int | |
1347 | nfsd4_client_record_check(struct nfs4_client *clp) | |
1348 | { | |
9a9c6478 SK |
1349 | struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); |
1350 | ||
1351 | if (nn->client_tracking_ops) | |
1352 | return nn->client_tracking_ops->check(clp); | |
2a4317c5 JL |
1353 | |
1354 | return -EOPNOTSUPP; | |
1355 | } | |
1356 | ||
1357 | void | |
12760c66 | 1358 | nfsd4_record_grace_done(struct nfsd_net *nn, time_t boot_time) |
2a4317c5 | 1359 | { |
9a9c6478 SK |
1360 | if (nn->client_tracking_ops) |
1361 | nn->client_tracking_ops->grace_done(nn, boot_time); | |
2a4317c5 | 1362 | } |
813fd320 JL |
1363 | |
1364 | static int | |
1365 | rpc_pipefs_event(struct notifier_block *nb, unsigned long event, void *ptr) | |
1366 | { | |
1367 | struct super_block *sb = ptr; | |
1368 | struct net *net = sb->s_fs_info; | |
1369 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); | |
1370 | struct cld_net *cn = nn->cld_net; | |
1371 | struct dentry *dentry; | |
1372 | int ret = 0; | |
1373 | ||
1374 | if (!try_module_get(THIS_MODULE)) | |
1375 | return 0; | |
1376 | ||
1377 | if (!cn) { | |
1378 | module_put(THIS_MODULE); | |
1379 | return 0; | |
1380 | } | |
1381 | ||
1382 | switch (event) { | |
1383 | case RPC_PIPEFS_MOUNT: | |
1384 | dentry = nfsd4_cld_register_sb(sb, cn->cn_pipe); | |
1385 | if (IS_ERR(dentry)) { | |
1386 | ret = PTR_ERR(dentry); | |
1387 | break; | |
1388 | } | |
1389 | cn->cn_pipe->dentry = dentry; | |
1390 | break; | |
1391 | case RPC_PIPEFS_UMOUNT: | |
1392 | if (cn->cn_pipe->dentry) | |
1393 | nfsd4_cld_unregister_sb(cn->cn_pipe); | |
1394 | break; | |
1395 | default: | |
1396 | ret = -ENOTSUPP; | |
1397 | break; | |
1398 | } | |
1399 | module_put(THIS_MODULE); | |
1400 | return ret; | |
1401 | } | |
1402 | ||
2355c596 | 1403 | static struct notifier_block nfsd4_cld_block = { |
813fd320 JL |
1404 | .notifier_call = rpc_pipefs_event, |
1405 | }; | |
797a9d79 JL |
1406 | |
1407 | int | |
1408 | register_cld_notifier(void) | |
1409 | { | |
1410 | return rpc_pipefs_notifier_register(&nfsd4_cld_block); | |
1411 | } | |
1412 | ||
1413 | void | |
1414 | unregister_cld_notifier(void) | |
1415 | { | |
1416 | rpc_pipefs_notifier_unregister(&nfsd4_cld_block); | |
1417 | } |