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