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 *); | |
61 | void (*grace_done)(struct net *, time_t); | |
62 | }; | |
63 | ||
190e4fbf | 64 | /* Globals */ |
e970a573 | 65 | static struct file *rec_file; |
48483bf2 | 66 | static char user_recovery_dirname[PATH_MAX] = "/var/lib/nfs/v4recovery"; |
2a4317c5 | 67 | static struct nfsd4_client_tracking_ops *client_tracking_ops; |
0ce0c2b5 | 68 | static bool in_grace; |
190e4fbf | 69 | |
d84f4f99 DH |
70 | static int |
71 | nfs4_save_creds(const struct cred **original_creds) | |
190e4fbf | 72 | { |
d84f4f99 DH |
73 | struct cred *new; |
74 | ||
75 | new = prepare_creds(); | |
76 | if (!new) | |
77 | return -ENOMEM; | |
78 | ||
79 | new->fsuid = 0; | |
80 | new->fsgid = 0; | |
81 | *original_creds = override_creds(new); | |
82 | put_cred(new); | |
83 | return 0; | |
190e4fbf N |
84 | } |
85 | ||
86 | static void | |
d84f4f99 | 87 | nfs4_reset_creds(const struct cred *original) |
190e4fbf | 88 | { |
d84f4f99 | 89 | revert_creds(original); |
190e4fbf N |
90 | } |
91 | ||
a55370a3 N |
92 | static void |
93 | md5_to_hex(char *out, char *md5) | |
94 | { | |
95 | int i; | |
96 | ||
97 | for (i=0; i<16; i++) { | |
98 | unsigned char c = md5[i]; | |
99 | ||
100 | *out++ = '0' + ((c&0xf0)>>4) + (c>=0xa0)*('a'-'9'-1); | |
101 | *out++ = '0' + (c&0x0f) + ((c&0x0f)>=0x0a)*('a'-'9'-1); | |
102 | } | |
103 | *out = '\0'; | |
104 | } | |
105 | ||
2216d449 JL |
106 | static int |
107 | nfs4_make_rec_clidname(char *dname, const struct xdr_netobj *clname) | |
a55370a3 N |
108 | { |
109 | struct xdr_netobj cksum; | |
35058687 | 110 | struct hash_desc desc; |
60c74f81 | 111 | struct scatterlist sg; |
2216d449 | 112 | int status; |
a55370a3 N |
113 | |
114 | dprintk("NFSD: nfs4_make_rec_clidname for %.*s\n", | |
115 | clname->len, clname->data); | |
35058687 HX |
116 | desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP; |
117 | desc.tfm = crypto_alloc_hash("md5", 0, CRYPTO_ALG_ASYNC); | |
2216d449 JL |
118 | if (IS_ERR(desc.tfm)) { |
119 | status = PTR_ERR(desc.tfm); | |
35058687 | 120 | goto out_no_tfm; |
2216d449 JL |
121 | } |
122 | ||
35058687 | 123 | cksum.len = crypto_hash_digestsize(desc.tfm); |
a55370a3 | 124 | cksum.data = kmalloc(cksum.len, GFP_KERNEL); |
2216d449 JL |
125 | if (cksum.data == NULL) { |
126 | status = -ENOMEM; | |
a55370a3 | 127 | goto out; |
2216d449 | 128 | } |
a55370a3 | 129 | |
60c74f81 | 130 | sg_init_one(&sg, clname->data, clname->len); |
a55370a3 | 131 | |
2216d449 JL |
132 | status = crypto_hash_digest(&desc, &sg, sg.length, cksum.data); |
133 | if (status) | |
35058687 | 134 | goto out; |
a55370a3 N |
135 | |
136 | md5_to_hex(dname, cksum.data); | |
137 | ||
2216d449 | 138 | status = 0; |
a55370a3 | 139 | out: |
2bd9e7b6 | 140 | kfree(cksum.data); |
35058687 HX |
141 | crypto_free_hash(desc.tfm); |
142 | out_no_tfm: | |
a55370a3 N |
143 | return status; |
144 | } | |
190e4fbf | 145 | |
2216d449 JL |
146 | /* |
147 | * If we had an error generating the recdir name for the legacy tracker | |
148 | * then warn the admin. If the error doesn't appear to be transient, | |
149 | * then disable recovery tracking. | |
150 | */ | |
151 | static void | |
152 | legacy_recdir_name_error(int error) | |
153 | { | |
154 | printk(KERN_ERR "NFSD: unable to generate recoverydir " | |
155 | "name (%d).\n", error); | |
156 | ||
157 | /* | |
158 | * if the algorithm just doesn't exist, then disable the recovery | |
159 | * tracker altogether. The crypto libs will generally return this if | |
160 | * FIPS is enabled as well. | |
161 | */ | |
162 | if (error == -ENOENT) { | |
163 | printk(KERN_ERR "NFSD: disabling legacy clientid tracking. " | |
164 | "Reboot recovery will not function correctly!\n"); | |
165 | ||
166 | /* the argument is ignored by the legacy exit function */ | |
167 | nfsd4_client_tracking_exit(NULL); | |
168 | } | |
169 | } | |
170 | ||
2a4317c5 JL |
171 | static void |
172 | nfsd4_create_clid_dir(struct nfs4_client *clp) | |
c7b9a459 | 173 | { |
d84f4f99 | 174 | const struct cred *original_cred; |
2216d449 | 175 | char dname[HEXDIR_LEN]; |
e970a573 | 176 | struct dentry *dir, *dentry; |
0ce0c2b5 | 177 | struct nfs4_client_reclaim *crp; |
c7b9a459 | 178 | int status; |
52e19c09 | 179 | struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); |
c7b9a459 N |
180 | |
181 | dprintk("NFSD: nfsd4_create_clid_dir for \"%s\"\n", dname); | |
182 | ||
a52d726b | 183 | if (test_and_set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) |
7a6ef8c7 | 184 | return; |
b8548894 | 185 | if (!rec_file) |
7a6ef8c7 | 186 | return; |
2216d449 JL |
187 | |
188 | status = nfs4_make_rec_clidname(dname, &clp->cl_name); | |
189 | if (status) | |
190 | return legacy_recdir_name_error(status); | |
191 | ||
d84f4f99 DH |
192 | status = nfs4_save_creds(&original_cred); |
193 | if (status < 0) | |
7a6ef8c7 | 194 | return; |
c7b9a459 | 195 | |
4a55c101 JK |
196 | status = mnt_want_write_file(rec_file); |
197 | if (status) | |
198 | return; | |
199 | ||
e970a573 | 200 | dir = rec_file->f_path.dentry; |
c7b9a459 | 201 | /* lock the parent */ |
e970a573 | 202 | mutex_lock(&dir->d_inode->i_mutex); |
c7b9a459 | 203 | |
e970a573 | 204 | dentry = lookup_one_len(dname, dir, HEXDIR_LEN-1); |
c7b9a459 N |
205 | if (IS_ERR(dentry)) { |
206 | status = PTR_ERR(dentry); | |
207 | goto out_unlock; | |
208 | } | |
6577aac0 | 209 | if (dentry->d_inode) |
aec39680 BF |
210 | /* |
211 | * In the 4.1 case, where we're called from | |
212 | * reclaim_complete(), records from the previous reboot | |
213 | * may still be left, so this is OK. | |
214 | * | |
215 | * In the 4.0 case, we should never get here; but we may | |
216 | * as well be forgiving and just succeed silently. | |
217 | */ | |
c7b9a459 | 218 | goto out_put; |
e970a573 | 219 | status = vfs_mkdir(dir->d_inode, dentry, S_IRWXU); |
c7b9a459 N |
220 | out_put: |
221 | dput(dentry); | |
222 | out_unlock: | |
e970a573 | 223 | mutex_unlock(&dir->d_inode->i_mutex); |
0ce0c2b5 JL |
224 | if (status == 0) { |
225 | if (in_grace) { | |
52e19c09 | 226 | crp = nfs4_client_to_reclaim(dname, nn); |
0ce0c2b5 JL |
227 | if (crp) |
228 | crp->cr_clp = clp; | |
229 | } | |
8018ab05 | 230 | vfs_fsync(rec_file, 0); |
0ce0c2b5 | 231 | } else { |
6577aac0 BH |
232 | printk(KERN_ERR "NFSD: failed to write recovery record" |
233 | " (err %d); please check that %s exists" | |
234 | " and is writeable", status, | |
235 | user_recovery_dirname); | |
0ce0c2b5 | 236 | } |
4a55c101 | 237 | mnt_drop_write_file(rec_file); |
d84f4f99 | 238 | nfs4_reset_creds(original_cred); |
c7b9a459 N |
239 | } |
240 | ||
52e19c09 | 241 | typedef int (recdir_func)(struct dentry *, struct dentry *, struct nfsd_net *); |
190e4fbf | 242 | |
05f4f678 BF |
243 | struct name_list { |
244 | char name[HEXDIR_LEN]; | |
190e4fbf N |
245 | struct list_head list; |
246 | }; | |
247 | ||
190e4fbf | 248 | static int |
05f4f678 | 249 | nfsd4_build_namelist(void *arg, const char *name, int namlen, |
afefdbb2 | 250 | loff_t offset, u64 ino, unsigned int d_type) |
190e4fbf | 251 | { |
05f4f678 BF |
252 | struct list_head *names = arg; |
253 | struct name_list *entry; | |
190e4fbf | 254 | |
05f4f678 | 255 | if (namlen != HEXDIR_LEN - 1) |
b37ad28b | 256 | return 0; |
05f4f678 BF |
257 | entry = kmalloc(sizeof(struct name_list), GFP_KERNEL); |
258 | if (entry == NULL) | |
190e4fbf | 259 | return -ENOMEM; |
05f4f678 BF |
260 | memcpy(entry->name, name, HEXDIR_LEN - 1); |
261 | entry->name[HEXDIR_LEN - 1] = '\0'; | |
262 | list_add(&entry->list, names); | |
190e4fbf N |
263 | return 0; |
264 | } | |
265 | ||
266 | static int | |
52e19c09 | 267 | nfsd4_list_rec_dir(recdir_func *f, struct nfsd_net *nn) |
190e4fbf | 268 | { |
d84f4f99 | 269 | const struct cred *original_cred; |
5b4b299c | 270 | struct dentry *dir = rec_file->f_path.dentry; |
05f4f678 | 271 | LIST_HEAD(names); |
190e4fbf N |
272 | int status; |
273 | ||
d84f4f99 DH |
274 | status = nfs4_save_creds(&original_cred); |
275 | if (status < 0) | |
276 | return status; | |
190e4fbf | 277 | |
5b4b299c AV |
278 | status = vfs_llseek(rec_file, 0, SEEK_SET); |
279 | if (status < 0) { | |
280 | nfs4_reset_creds(original_cred); | |
281 | return status; | |
282 | } | |
283 | ||
284 | status = vfs_readdir(rec_file, nfsd4_build_namelist, &names); | |
8daed1e5 | 285 | mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_PARENT); |
05f4f678 | 286 | while (!list_empty(&names)) { |
5b4b299c | 287 | struct name_list *entry; |
05f4f678 | 288 | entry = list_entry(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 N |
307 | static int |
308 | nfsd4_unlink_clid_dir(char *name, int namlen) | |
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 | ||
e970a573 CH |
315 | dir = rec_file->f_path.dentry; |
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 | |
a52d726b | 342 | if (!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) | |
347 | return legacy_recdir_name_error(status); | |
348 | ||
a561be71 | 349 | status = mnt_want_write_file(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 | |
2216d449 | 358 | status = nfsd4_unlink_clid_dir(dname, HEXDIR_LEN-1); |
d84f4f99 | 359 | nfs4_reset_creds(original_cred); |
0ce0c2b5 | 360 | if (status == 0) { |
8018ab05 | 361 | vfs_fsync(rec_file, 0); |
0ce0c2b5 JL |
362 | if (in_grace) { |
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: |
2a79f17e | 370 | mnt_drop_write_file(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 JL |
393 | static void |
394 | nfsd4_recdir_purge_old(struct net *net, time_t boot_time) | |
395 | { | |
c7b9a459 | 396 | int status; |
52e19c09 | 397 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
c7b9a459 | 398 | |
0ce0c2b5 | 399 | in_grace = false; |
e970a573 | 400 | if (!rec_file) |
c7b9a459 | 401 | return; |
a561be71 | 402 | status = mnt_want_write_file(rec_file); |
0622753b DH |
403 | if (status) |
404 | goto out; | |
52e19c09 | 405 | status = nfsd4_list_rec_dir(purge_old, nn); |
c7b9a459 | 406 | if (status == 0) |
8018ab05 | 407 | vfs_fsync(rec_file, 0); |
2a79f17e | 408 | mnt_drop_write_file(rec_file); |
0622753b | 409 | out: |
52e19c09 | 410 | nfs4_release_reclaim(nn); |
c7b9a459 N |
411 | if (status) |
412 | printk("nfsd4: failed to purge old clients from recovery" | |
e970a573 | 413 | " directory %s\n", rec_file->f_path.dentry->d_name.name); |
c7b9a459 N |
414 | } |
415 | ||
190e4fbf | 416 | static int |
52e19c09 | 417 | load_recdir(struct dentry *parent, struct dentry *child, struct nfsd_net *nn) |
190e4fbf N |
418 | { |
419 | if (child->d_name.len != HEXDIR_LEN - 1) { | |
420 | printk("nfsd4: illegal name %s in recovery directory\n", | |
421 | child->d_name.name); | |
422 | /* Keep trying; maybe the others are OK: */ | |
b37ad28b | 423 | return 0; |
190e4fbf | 424 | } |
52e19c09 | 425 | nfs4_client_to_reclaim(child->d_name.name, nn); |
b37ad28b | 426 | return 0; |
190e4fbf N |
427 | } |
428 | ||
2a4317c5 | 429 | static int |
52e19c09 | 430 | nfsd4_recdir_load(struct net *net) { |
190e4fbf | 431 | int status; |
52e19c09 | 432 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
190e4fbf | 433 | |
e970a573 CH |
434 | if (!rec_file) |
435 | return 0; | |
436 | ||
52e19c09 | 437 | status = nfsd4_list_rec_dir(load_recdir, nn); |
190e4fbf N |
438 | if (status) |
439 | printk("nfsd4: failed loading clients from recovery" | |
e970a573 | 440 | " directory %s\n", rec_file->f_path.dentry->d_name.name); |
190e4fbf N |
441 | return status; |
442 | } | |
443 | ||
444 | /* | |
445 | * Hold reference to the recovery directory. | |
446 | */ | |
447 | ||
2a4317c5 JL |
448 | static int |
449 | nfsd4_init_recdir(void) | |
190e4fbf | 450 | { |
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 | |
e970a573 | 457 | BUG_ON(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 | |
48483bf2 | 467 | rec_file = filp_open(user_recovery_dirname, O_RDONLY | O_DIRECTORY, 0); |
e970a573 | 468 | if (IS_ERR(rec_file)) { |
c2642ab0 | 469 | printk("NFSD: unable to find recovery directory %s\n", |
48483bf2 | 470 | user_recovery_dirname); |
2a4317c5 | 471 | status = PTR_ERR(rec_file); |
e970a573 CH |
472 | rec_file = NULL; |
473 | } | |
190e4fbf | 474 | |
d84f4f99 | 475 | nfs4_reset_creds(original_cred); |
0ce0c2b5 JL |
476 | if (!status) |
477 | 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 | ||
52e19c09 SK |
513 | nfs4_lock_state(); |
514 | status = nfsd4_init_recdir(); | |
515 | if (!status) | |
516 | status = nfsd4_recdir_load(net); | |
517 | nfs4_unlock_state(); | |
518 | if (status) | |
519 | printk(KERN_ERR "NFSD: Failure reading reboot recovery data\n"); | |
520 | return status; | |
521 | } | |
522 | ||
523 | static int | |
524 | nfsd4_legacy_tracking_init(struct net *net) | |
525 | { | |
526 | int status; | |
527 | ||
cc27e0d4 JL |
528 | /* XXX: The legacy code won't work in a container */ |
529 | if (net != &init_net) { | |
530 | WARN(1, KERN_ERR "NFSD: attempt to initialize legacy client " | |
531 | "tracking in a container!\n"); | |
532 | return -EINVAL; | |
533 | } | |
534 | ||
52e19c09 | 535 | status = nfs4_legacy_state_init(net); |
2a4317c5 | 536 | if (status) |
52e19c09 SK |
537 | return status; |
538 | ||
539 | status = nfsd4_load_reboot_recovery_data(net); | |
540 | if (status) | |
541 | goto err; | |
542 | return 0; | |
543 | ||
544 | err: | |
545 | nfs4_legacy_state_shutdown(net); | |
2a4317c5 JL |
546 | return status; |
547 | } | |
548 | ||
549 | static void | |
190e4fbf N |
550 | nfsd4_shutdown_recdir(void) |
551 | { | |
e970a573 | 552 | if (!rec_file) |
190e4fbf | 553 | return; |
e970a573 CH |
554 | fput(rec_file); |
555 | rec_file = NULL; | |
190e4fbf | 556 | } |
48483bf2 | 557 | |
2a4317c5 JL |
558 | static void |
559 | nfsd4_legacy_tracking_exit(struct net *net) | |
560 | { | |
52e19c09 SK |
561 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
562 | ||
563 | nfs4_release_reclaim(nn); | |
2a4317c5 | 564 | nfsd4_shutdown_recdir(); |
52e19c09 | 565 | nfs4_legacy_state_shutdown(net); |
2a4317c5 JL |
566 | } |
567 | ||
48483bf2 BF |
568 | /* |
569 | * Change the NFSv4 recovery directory to recdir. | |
570 | */ | |
571 | int | |
572 | nfs4_reset_recoverydir(char *recdir) | |
573 | { | |
574 | int status; | |
575 | struct path path; | |
576 | ||
577 | status = kern_path(recdir, LOOKUP_FOLLOW, &path); | |
578 | if (status) | |
579 | return status; | |
580 | status = -ENOTDIR; | |
581 | if (S_ISDIR(path.dentry->d_inode->i_mode)) { | |
582 | strcpy(user_recovery_dirname, recdir); | |
583 | status = 0; | |
584 | } | |
585 | path_put(&path); | |
586 | return status; | |
587 | } | |
588 | ||
589 | char * | |
590 | nfs4_recoverydir(void) | |
591 | { | |
592 | return user_recovery_dirname; | |
593 | } | |
2a4317c5 JL |
594 | |
595 | static int | |
596 | nfsd4_check_legacy_client(struct nfs4_client *clp) | |
597 | { | |
2216d449 JL |
598 | int status; |
599 | char dname[HEXDIR_LEN]; | |
0ce0c2b5 | 600 | struct nfs4_client_reclaim *crp; |
52e19c09 | 601 | struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); |
0ce0c2b5 | 602 | |
2a4317c5 JL |
603 | /* did we already find that this client is stable? */ |
604 | if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) | |
605 | return 0; | |
606 | ||
2216d449 JL |
607 | status = nfs4_make_rec_clidname(dname, &clp->cl_name); |
608 | if (status) { | |
609 | legacy_recdir_name_error(status); | |
610 | return status; | |
611 | } | |
612 | ||
2a4317c5 | 613 | /* look for it in the reclaim hashtable otherwise */ |
52e19c09 | 614 | crp = nfsd4_find_reclaim_client(dname, nn); |
0ce0c2b5 | 615 | if (crp) { |
2a4317c5 | 616 | set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags); |
0ce0c2b5 | 617 | crp->cr_clp = clp; |
2a4317c5 JL |
618 | return 0; |
619 | } | |
620 | ||
621 | return -ENOENT; | |
622 | } | |
623 | ||
624 | static struct nfsd4_client_tracking_ops nfsd4_legacy_tracking_ops = { | |
52e19c09 | 625 | .init = nfsd4_legacy_tracking_init, |
2a4317c5 JL |
626 | .exit = nfsd4_legacy_tracking_exit, |
627 | .create = nfsd4_create_clid_dir, | |
628 | .remove = nfsd4_remove_clid_dir, | |
629 | .check = nfsd4_check_legacy_client, | |
630 | .grace_done = nfsd4_recdir_purge_old, | |
631 | }; | |
632 | ||
f3f80148 JL |
633 | /* Globals */ |
634 | #define NFSD_PIPE_DIR "nfsd" | |
635 | #define NFSD_CLD_PIPE "cld" | |
636 | ||
637 | /* per-net-ns structure for holding cld upcall info */ | |
638 | struct cld_net { | |
639 | struct rpc_pipe *cn_pipe; | |
640 | spinlock_t cn_lock; | |
641 | struct list_head cn_list; | |
642 | unsigned int cn_xid; | |
643 | }; | |
644 | ||
645 | struct cld_upcall { | |
646 | struct list_head cu_list; | |
647 | struct cld_net *cu_net; | |
648 | struct task_struct *cu_task; | |
649 | struct cld_msg cu_msg; | |
650 | }; | |
651 | ||
652 | static int | |
653 | __cld_pipe_upcall(struct rpc_pipe *pipe, struct cld_msg *cmsg) | |
654 | { | |
655 | int ret; | |
656 | struct rpc_pipe_msg msg; | |
657 | ||
658 | memset(&msg, 0, sizeof(msg)); | |
659 | msg.data = cmsg; | |
660 | msg.len = sizeof(*cmsg); | |
661 | ||
662 | /* | |
663 | * Set task state before we queue the upcall. That prevents | |
664 | * wake_up_process in the downcall from racing with schedule. | |
665 | */ | |
666 | set_current_state(TASK_UNINTERRUPTIBLE); | |
667 | ret = rpc_queue_upcall(pipe, &msg); | |
668 | if (ret < 0) { | |
669 | set_current_state(TASK_RUNNING); | |
670 | goto out; | |
671 | } | |
672 | ||
673 | schedule(); | |
674 | set_current_state(TASK_RUNNING); | |
675 | ||
676 | if (msg.errno < 0) | |
677 | ret = msg.errno; | |
678 | out: | |
679 | return ret; | |
680 | } | |
681 | ||
682 | static int | |
683 | cld_pipe_upcall(struct rpc_pipe *pipe, struct cld_msg *cmsg) | |
684 | { | |
685 | int ret; | |
686 | ||
687 | /* | |
688 | * -EAGAIN occurs when pipe is closed and reopened while there are | |
689 | * upcalls queued. | |
690 | */ | |
691 | do { | |
692 | ret = __cld_pipe_upcall(pipe, cmsg); | |
693 | } while (ret == -EAGAIN); | |
694 | ||
695 | return ret; | |
696 | } | |
697 | ||
698 | static ssize_t | |
699 | cld_pipe_downcall(struct file *filp, const char __user *src, size_t mlen) | |
700 | { | |
701 | struct cld_upcall *tmp, *cup; | |
bc1b542b | 702 | struct cld_msg __user *cmsg = (struct cld_msg __user *)src; |
f3f80148 JL |
703 | uint32_t xid; |
704 | struct nfsd_net *nn = net_generic(filp->f_dentry->d_sb->s_fs_info, | |
705 | nfsd_net_id); | |
706 | struct cld_net *cn = nn->cld_net; | |
707 | ||
708 | if (mlen != sizeof(*cmsg)) { | |
8a7dc4b0 | 709 | dprintk("%s: got %zu bytes, expected %zu\n", __func__, mlen, |
f3f80148 JL |
710 | sizeof(*cmsg)); |
711 | return -EINVAL; | |
712 | } | |
713 | ||
714 | /* copy just the xid so we can try to find that */ | |
715 | if (copy_from_user(&xid, &cmsg->cm_xid, sizeof(xid)) != 0) { | |
716 | dprintk("%s: error when copying xid from userspace", __func__); | |
717 | return -EFAULT; | |
718 | } | |
719 | ||
720 | /* walk the list and find corresponding xid */ | |
721 | cup = NULL; | |
722 | spin_lock(&cn->cn_lock); | |
723 | list_for_each_entry(tmp, &cn->cn_list, cu_list) { | |
724 | if (get_unaligned(&tmp->cu_msg.cm_xid) == xid) { | |
725 | cup = tmp; | |
726 | list_del_init(&cup->cu_list); | |
727 | break; | |
728 | } | |
729 | } | |
730 | spin_unlock(&cn->cn_lock); | |
731 | ||
732 | /* couldn't find upcall? */ | |
733 | if (!cup) { | |
21f72c9f | 734 | dprintk("%s: couldn't find upcall -- xid=%u\n", __func__, xid); |
f3f80148 JL |
735 | return -EINVAL; |
736 | } | |
737 | ||
738 | if (copy_from_user(&cup->cu_msg, src, mlen) != 0) | |
739 | return -EFAULT; | |
740 | ||
741 | wake_up_process(cup->cu_task); | |
742 | return mlen; | |
743 | } | |
744 | ||
745 | static void | |
746 | cld_pipe_destroy_msg(struct rpc_pipe_msg *msg) | |
747 | { | |
748 | struct cld_msg *cmsg = msg->data; | |
749 | struct cld_upcall *cup = container_of(cmsg, struct cld_upcall, | |
750 | cu_msg); | |
751 | ||
752 | /* errno >= 0 means we got a downcall */ | |
753 | if (msg->errno >= 0) | |
754 | return; | |
755 | ||
756 | wake_up_process(cup->cu_task); | |
757 | } | |
758 | ||
759 | static const struct rpc_pipe_ops cld_upcall_ops = { | |
760 | .upcall = rpc_pipe_generic_upcall, | |
761 | .downcall = cld_pipe_downcall, | |
762 | .destroy_msg = cld_pipe_destroy_msg, | |
763 | }; | |
764 | ||
765 | static struct dentry * | |
766 | nfsd4_cld_register_sb(struct super_block *sb, struct rpc_pipe *pipe) | |
767 | { | |
768 | struct dentry *dir, *dentry; | |
769 | ||
770 | dir = rpc_d_lookup_sb(sb, NFSD_PIPE_DIR); | |
771 | if (dir == NULL) | |
772 | return ERR_PTR(-ENOENT); | |
773 | dentry = rpc_mkpipe_dentry(dir, NFSD_CLD_PIPE, NULL, pipe); | |
774 | dput(dir); | |
775 | return dentry; | |
776 | } | |
777 | ||
778 | static void | |
779 | nfsd4_cld_unregister_sb(struct rpc_pipe *pipe) | |
780 | { | |
781 | if (pipe->dentry) | |
782 | rpc_unlink(pipe->dentry); | |
783 | } | |
784 | ||
785 | static struct dentry * | |
786 | nfsd4_cld_register_net(struct net *net, struct rpc_pipe *pipe) | |
787 | { | |
788 | struct super_block *sb; | |
789 | struct dentry *dentry; | |
790 | ||
791 | sb = rpc_get_sb_net(net); | |
792 | if (!sb) | |
793 | return NULL; | |
794 | dentry = nfsd4_cld_register_sb(sb, pipe); | |
795 | rpc_put_sb_net(net); | |
796 | return dentry; | |
797 | } | |
798 | ||
799 | static void | |
800 | nfsd4_cld_unregister_net(struct net *net, struct rpc_pipe *pipe) | |
801 | { | |
802 | struct super_block *sb; | |
803 | ||
804 | sb = rpc_get_sb_net(net); | |
805 | if (sb) { | |
806 | nfsd4_cld_unregister_sb(pipe); | |
807 | rpc_put_sb_net(net); | |
808 | } | |
809 | } | |
810 | ||
811 | /* Initialize rpc_pipefs pipe for communication with client tracking daemon */ | |
812 | static int | |
813 | nfsd4_init_cld_pipe(struct net *net) | |
814 | { | |
815 | int ret; | |
816 | struct dentry *dentry; | |
817 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); | |
818 | struct cld_net *cn; | |
819 | ||
820 | if (nn->cld_net) | |
821 | return 0; | |
822 | ||
823 | cn = kzalloc(sizeof(*cn), GFP_KERNEL); | |
824 | if (!cn) { | |
825 | ret = -ENOMEM; | |
826 | goto err; | |
827 | } | |
828 | ||
829 | cn->cn_pipe = rpc_mkpipe_data(&cld_upcall_ops, RPC_PIPE_WAIT_FOR_OPEN); | |
830 | if (IS_ERR(cn->cn_pipe)) { | |
831 | ret = PTR_ERR(cn->cn_pipe); | |
832 | goto err; | |
833 | } | |
834 | spin_lock_init(&cn->cn_lock); | |
835 | INIT_LIST_HEAD(&cn->cn_list); | |
836 | ||
837 | dentry = nfsd4_cld_register_net(net, cn->cn_pipe); | |
838 | if (IS_ERR(dentry)) { | |
839 | ret = PTR_ERR(dentry); | |
840 | goto err_destroy_data; | |
841 | } | |
842 | ||
843 | cn->cn_pipe->dentry = dentry; | |
844 | nn->cld_net = cn; | |
845 | return 0; | |
846 | ||
847 | err_destroy_data: | |
848 | rpc_destroy_pipe_data(cn->cn_pipe); | |
849 | err: | |
850 | kfree(cn); | |
851 | printk(KERN_ERR "NFSD: unable to create nfsdcld upcall pipe (%d)\n", | |
852 | ret); | |
853 | return ret; | |
854 | } | |
855 | ||
856 | static void | |
857 | nfsd4_remove_cld_pipe(struct net *net) | |
858 | { | |
859 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); | |
860 | struct cld_net *cn = nn->cld_net; | |
861 | ||
862 | nfsd4_cld_unregister_net(net, cn->cn_pipe); | |
863 | rpc_destroy_pipe_data(cn->cn_pipe); | |
864 | kfree(nn->cld_net); | |
865 | nn->cld_net = NULL; | |
866 | } | |
867 | ||
868 | static struct cld_upcall * | |
869 | alloc_cld_upcall(struct cld_net *cn) | |
870 | { | |
871 | struct cld_upcall *new, *tmp; | |
872 | ||
873 | new = kzalloc(sizeof(*new), GFP_KERNEL); | |
874 | if (!new) | |
875 | return new; | |
876 | ||
877 | /* FIXME: hard cap on number in flight? */ | |
878 | restart_search: | |
879 | spin_lock(&cn->cn_lock); | |
880 | list_for_each_entry(tmp, &cn->cn_list, cu_list) { | |
881 | if (tmp->cu_msg.cm_xid == cn->cn_xid) { | |
882 | cn->cn_xid++; | |
883 | spin_unlock(&cn->cn_lock); | |
884 | goto restart_search; | |
885 | } | |
886 | } | |
887 | new->cu_task = current; | |
888 | new->cu_msg.cm_vers = CLD_UPCALL_VERSION; | |
889 | put_unaligned(cn->cn_xid++, &new->cu_msg.cm_xid); | |
890 | new->cu_net = cn; | |
891 | list_add(&new->cu_list, &cn->cn_list); | |
892 | spin_unlock(&cn->cn_lock); | |
893 | ||
894 | dprintk("%s: allocated xid %u\n", __func__, new->cu_msg.cm_xid); | |
895 | ||
896 | return new; | |
897 | } | |
898 | ||
899 | static void | |
900 | free_cld_upcall(struct cld_upcall *victim) | |
901 | { | |
902 | struct cld_net *cn = victim->cu_net; | |
903 | ||
904 | spin_lock(&cn->cn_lock); | |
905 | list_del(&victim->cu_list); | |
906 | spin_unlock(&cn->cn_lock); | |
907 | kfree(victim); | |
908 | } | |
909 | ||
910 | /* Ask daemon to create a new record */ | |
911 | static void | |
912 | nfsd4_cld_create(struct nfs4_client *clp) | |
913 | { | |
914 | int ret; | |
915 | struct cld_upcall *cup; | |
c212cecf | 916 | struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); |
f3f80148 JL |
917 | struct cld_net *cn = nn->cld_net; |
918 | ||
919 | /* Don't upcall if it's already stored */ | |
920 | if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) | |
921 | return; | |
922 | ||
923 | cup = alloc_cld_upcall(cn); | |
924 | if (!cup) { | |
925 | ret = -ENOMEM; | |
926 | goto out_err; | |
927 | } | |
928 | ||
929 | cup->cu_msg.cm_cmd = Cld_Create; | |
930 | cup->cu_msg.cm_u.cm_name.cn_len = clp->cl_name.len; | |
931 | memcpy(cup->cu_msg.cm_u.cm_name.cn_id, clp->cl_name.data, | |
932 | clp->cl_name.len); | |
933 | ||
934 | ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_msg); | |
935 | if (!ret) { | |
936 | ret = cup->cu_msg.cm_status; | |
937 | set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags); | |
938 | } | |
939 | ||
940 | free_cld_upcall(cup); | |
941 | out_err: | |
942 | if (ret) | |
943 | printk(KERN_ERR "NFSD: Unable to create client " | |
944 | "record on stable storage: %d\n", ret); | |
945 | } | |
946 | ||
947 | /* Ask daemon to create a new record */ | |
948 | static void | |
949 | nfsd4_cld_remove(struct nfs4_client *clp) | |
950 | { | |
951 | int ret; | |
952 | struct cld_upcall *cup; | |
c212cecf | 953 | struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); |
f3f80148 JL |
954 | struct cld_net *cn = nn->cld_net; |
955 | ||
956 | /* Don't upcall if it's already removed */ | |
957 | if (!test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) | |
958 | return; | |
959 | ||
960 | cup = alloc_cld_upcall(cn); | |
961 | if (!cup) { | |
962 | ret = -ENOMEM; | |
963 | goto out_err; | |
964 | } | |
965 | ||
966 | cup->cu_msg.cm_cmd = Cld_Remove; | |
967 | cup->cu_msg.cm_u.cm_name.cn_len = clp->cl_name.len; | |
968 | memcpy(cup->cu_msg.cm_u.cm_name.cn_id, clp->cl_name.data, | |
969 | clp->cl_name.len); | |
970 | ||
971 | ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_msg); | |
972 | if (!ret) { | |
973 | ret = cup->cu_msg.cm_status; | |
974 | clear_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags); | |
975 | } | |
976 | ||
977 | free_cld_upcall(cup); | |
978 | out_err: | |
979 | if (ret) | |
980 | printk(KERN_ERR "NFSD: Unable to remove client " | |
981 | "record from stable storage: %d\n", ret); | |
982 | } | |
983 | ||
984 | /* Check for presence of a record, and update its timestamp */ | |
985 | static int | |
986 | nfsd4_cld_check(struct nfs4_client *clp) | |
987 | { | |
988 | int ret; | |
989 | struct cld_upcall *cup; | |
c212cecf | 990 | struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); |
f3f80148 JL |
991 | struct cld_net *cn = nn->cld_net; |
992 | ||
993 | /* Don't upcall if one was already stored during this grace pd */ | |
994 | if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) | |
995 | return 0; | |
996 | ||
997 | cup = alloc_cld_upcall(cn); | |
998 | if (!cup) { | |
999 | printk(KERN_ERR "NFSD: Unable to check client record on " | |
1000 | "stable storage: %d\n", -ENOMEM); | |
1001 | return -ENOMEM; | |
1002 | } | |
1003 | ||
1004 | cup->cu_msg.cm_cmd = Cld_Check; | |
1005 | cup->cu_msg.cm_u.cm_name.cn_len = clp->cl_name.len; | |
1006 | memcpy(cup->cu_msg.cm_u.cm_name.cn_id, clp->cl_name.data, | |
1007 | clp->cl_name.len); | |
1008 | ||
1009 | ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_msg); | |
1010 | if (!ret) { | |
1011 | ret = cup->cu_msg.cm_status; | |
1012 | set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags); | |
1013 | } | |
1014 | ||
1015 | free_cld_upcall(cup); | |
1016 | return ret; | |
1017 | } | |
1018 | ||
1019 | static void | |
1020 | nfsd4_cld_grace_done(struct net *net, time_t boot_time) | |
1021 | { | |
1022 | int ret; | |
1023 | struct cld_upcall *cup; | |
1024 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); | |
1025 | struct cld_net *cn = nn->cld_net; | |
1026 | ||
1027 | cup = alloc_cld_upcall(cn); | |
1028 | if (!cup) { | |
1029 | ret = -ENOMEM; | |
1030 | goto out_err; | |
1031 | } | |
1032 | ||
1033 | cup->cu_msg.cm_cmd = Cld_GraceDone; | |
1034 | cup->cu_msg.cm_u.cm_gracetime = (int64_t)boot_time; | |
1035 | ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_msg); | |
1036 | if (!ret) | |
1037 | ret = cup->cu_msg.cm_status; | |
1038 | ||
1039 | free_cld_upcall(cup); | |
1040 | out_err: | |
1041 | if (ret) | |
1042 | printk(KERN_ERR "NFSD: Unable to end grace period: %d\n", ret); | |
1043 | } | |
1044 | ||
1045 | static struct nfsd4_client_tracking_ops nfsd4_cld_tracking_ops = { | |
1046 | .init = nfsd4_init_cld_pipe, | |
1047 | .exit = nfsd4_remove_cld_pipe, | |
1048 | .create = nfsd4_cld_create, | |
1049 | .remove = nfsd4_cld_remove, | |
1050 | .check = nfsd4_cld_check, | |
1051 | .grace_done = nfsd4_cld_grace_done, | |
1052 | }; | |
1053 | ||
2873d214 JL |
1054 | /* upcall via usermodehelper */ |
1055 | static char cltrack_prog[PATH_MAX] = "/sbin/nfsdcltrack"; | |
1056 | module_param_string(cltrack_prog, cltrack_prog, sizeof(cltrack_prog), | |
1057 | S_IRUGO|S_IWUSR); | |
1058 | MODULE_PARM_DESC(cltrack_prog, "Path to the nfsdcltrack upcall program"); | |
1059 | ||
f3aa7e24 JL |
1060 | static bool cltrack_legacy_disable; |
1061 | module_param(cltrack_legacy_disable, bool, S_IRUGO|S_IWUSR); | |
1062 | MODULE_PARM_DESC(cltrack_legacy_disable, | |
1063 | "Disable legacy recoverydir conversion. Default: false"); | |
1064 | ||
1065 | #define LEGACY_TOPDIR_ENV_PREFIX "NFSDCLTRACK_LEGACY_TOPDIR=" | |
1066 | #define LEGACY_RECDIR_ENV_PREFIX "NFSDCLTRACK_LEGACY_RECDIR=" | |
1067 | ||
1068 | static char * | |
1069 | nfsd4_cltrack_legacy_topdir(void) | |
1070 | { | |
1071 | int copied; | |
1072 | size_t len; | |
1073 | char *result; | |
1074 | ||
1075 | if (cltrack_legacy_disable) | |
1076 | return NULL; | |
1077 | ||
1078 | len = strlen(LEGACY_TOPDIR_ENV_PREFIX) + | |
1079 | strlen(nfs4_recoverydir()) + 1; | |
1080 | ||
1081 | result = kmalloc(len, GFP_KERNEL); | |
1082 | if (!result) | |
1083 | return result; | |
1084 | ||
1085 | copied = snprintf(result, len, LEGACY_TOPDIR_ENV_PREFIX "%s", | |
1086 | nfs4_recoverydir()); | |
1087 | if (copied >= len) { | |
1088 | /* just return nothing if output was truncated */ | |
1089 | kfree(result); | |
1090 | return NULL; | |
1091 | } | |
1092 | ||
1093 | return result; | |
1094 | } | |
1095 | ||
1096 | static char * | |
2216d449 | 1097 | nfsd4_cltrack_legacy_recdir(const struct xdr_netobj *name) |
f3aa7e24 JL |
1098 | { |
1099 | int copied; | |
1100 | size_t len; | |
1101 | char *result; | |
1102 | ||
1103 | if (cltrack_legacy_disable) | |
1104 | return NULL; | |
1105 | ||
1106 | /* +1 is for '/' between "topdir" and "recdir" */ | |
1107 | len = strlen(LEGACY_RECDIR_ENV_PREFIX) + | |
1108 | strlen(nfs4_recoverydir()) + 1 + HEXDIR_LEN; | |
1109 | ||
1110 | result = kmalloc(len, GFP_KERNEL); | |
1111 | if (!result) | |
1112 | return result; | |
1113 | ||
2216d449 JL |
1114 | copied = snprintf(result, len, LEGACY_RECDIR_ENV_PREFIX "%s/", |
1115 | nfs4_recoverydir()); | |
1116 | if (copied > (len - HEXDIR_LEN)) { | |
1117 | /* just return nothing if output will be truncated */ | |
1118 | kfree(result); | |
1119 | return NULL; | |
1120 | } | |
1121 | ||
1122 | copied = nfs4_make_rec_clidname(result + copied, name); | |
1123 | if (copied) { | |
f3aa7e24 JL |
1124 | kfree(result); |
1125 | return NULL; | |
1126 | } | |
1127 | ||
1128 | return result; | |
1129 | } | |
1130 | ||
2873d214 | 1131 | static int |
f3aa7e24 | 1132 | nfsd4_umh_cltrack_upcall(char *cmd, char *arg, char *legacy) |
2873d214 | 1133 | { |
f3aa7e24 | 1134 | char *envp[2]; |
2873d214 JL |
1135 | char *argv[4]; |
1136 | int ret; | |
1137 | ||
1138 | if (unlikely(!cltrack_prog[0])) { | |
1139 | dprintk("%s: cltrack_prog is disabled\n", __func__); | |
1140 | return -EACCES; | |
1141 | } | |
1142 | ||
1143 | dprintk("%s: cmd: %s\n", __func__, cmd); | |
1144 | dprintk("%s: arg: %s\n", __func__, arg ? arg : "(null)"); | |
f3aa7e24 JL |
1145 | dprintk("%s: legacy: %s\n", __func__, legacy ? legacy : "(null)"); |
1146 | ||
1147 | envp[0] = legacy; | |
1148 | envp[1] = NULL; | |
2873d214 JL |
1149 | |
1150 | argv[0] = (char *)cltrack_prog; | |
1151 | argv[1] = cmd; | |
1152 | argv[2] = arg; | |
1153 | argv[3] = NULL; | |
1154 | ||
1155 | ret = call_usermodehelper(argv[0], argv, envp, UMH_WAIT_PROC); | |
1156 | /* | |
1157 | * Disable the upcall mechanism if we're getting an ENOENT or EACCES | |
1158 | * error. The admin can re-enable it on the fly by using sysfs | |
1159 | * once the problem has been fixed. | |
1160 | */ | |
1161 | if (ret == -ENOENT || ret == -EACCES) { | |
1162 | dprintk("NFSD: %s was not found or isn't executable (%d). " | |
1163 | "Setting cltrack_prog to blank string!", | |
1164 | cltrack_prog, ret); | |
1165 | cltrack_prog[0] = '\0'; | |
1166 | } | |
1167 | dprintk("%s: %s return value: %d\n", __func__, cltrack_prog, ret); | |
1168 | ||
1169 | return ret; | |
1170 | } | |
1171 | ||
1172 | static char * | |
1173 | bin_to_hex_dup(const unsigned char *src, int srclen) | |
1174 | { | |
1175 | int i; | |
1176 | char *buf, *hex; | |
1177 | ||
1178 | /* +1 for terminating NULL */ | |
1179 | buf = kmalloc((srclen * 2) + 1, GFP_KERNEL); | |
1180 | if (!buf) | |
1181 | return buf; | |
1182 | ||
1183 | hex = buf; | |
1184 | for (i = 0; i < srclen; i++) { | |
1185 | sprintf(hex, "%2.2x", *src++); | |
1186 | hex += 2; | |
1187 | } | |
1188 | return buf; | |
1189 | } | |
1190 | ||
1191 | static int | |
1192 | nfsd4_umh_cltrack_init(struct net __attribute__((unused)) *net) | |
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 | |
1244 | nfsd4_umh_cltrack_grace_done(struct net __attribute__((unused)) *net, | |
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; |
2a4317c5 | 1270 | |
2d77bf0a JL |
1271 | /* just run the init if it the method is already decided */ |
1272 | if (client_tracking_ops) | |
1273 | goto do_init; | |
1274 | ||
1275 | /* | |
1276 | * First, try a UMH upcall. It should succeed or fail quickly, so | |
1277 | * there's little harm in trying that first. | |
1278 | */ | |
1279 | client_tracking_ops = &nfsd4_umh_tracking_ops; | |
1280 | status = client_tracking_ops->init(net); | |
1281 | if (!status) | |
1282 | return status; | |
1283 | ||
1284 | /* | |
1285 | * See if the recoverydir exists and is a directory. If it is, | |
1286 | * then use the legacy ops. | |
1287 | */ | |
1288 | client_tracking_ops = &nfsd4_legacy_tracking_ops; | |
1289 | status = kern_path(nfs4_recoverydir(), LOOKUP_FOLLOW, &path); | |
1290 | if (!status) { | |
1291 | status = S_ISDIR(path.dentry->d_inode->i_mode); | |
1292 | path_put(&path); | |
1293 | if (status) | |
1294 | goto do_init; | |
f3f80148 | 1295 | } |
2a4317c5 | 1296 | |
2d77bf0a JL |
1297 | /* Finally, try to use nfsdcld */ |
1298 | client_tracking_ops = &nfsd4_cld_tracking_ops; | |
8b0554e9 JL |
1299 | printk(KERN_WARNING "NFSD: the nfsdcld client tracking upcall will be " |
1300 | "removed in 3.10. Please transition to using " | |
1301 | "nfsdcltrack.\n"); | |
2d77bf0a | 1302 | do_init: |
2a4317c5 JL |
1303 | status = client_tracking_ops->init(net); |
1304 | if (status) { | |
1305 | printk(KERN_WARNING "NFSD: Unable to initialize client " | |
1306 | "recovery tracking! (%d)\n", status); | |
1307 | client_tracking_ops = NULL; | |
1308 | } | |
1309 | return status; | |
1310 | } | |
1311 | ||
1312 | void | |
1313 | nfsd4_client_tracking_exit(struct net *net) | |
1314 | { | |
1315 | if (client_tracking_ops) { | |
2873d214 JL |
1316 | if (client_tracking_ops->exit) |
1317 | client_tracking_ops->exit(net); | |
2a4317c5 JL |
1318 | client_tracking_ops = NULL; |
1319 | } | |
1320 | } | |
1321 | ||
1322 | void | |
1323 | nfsd4_client_record_create(struct nfs4_client *clp) | |
1324 | { | |
1325 | if (client_tracking_ops) | |
1326 | client_tracking_ops->create(clp); | |
1327 | } | |
1328 | ||
1329 | void | |
1330 | nfsd4_client_record_remove(struct nfs4_client *clp) | |
1331 | { | |
1332 | if (client_tracking_ops) | |
1333 | client_tracking_ops->remove(clp); | |
1334 | } | |
1335 | ||
1336 | int | |
1337 | nfsd4_client_record_check(struct nfs4_client *clp) | |
1338 | { | |
1339 | if (client_tracking_ops) | |
1340 | return client_tracking_ops->check(clp); | |
1341 | ||
1342 | return -EOPNOTSUPP; | |
1343 | } | |
1344 | ||
1345 | void | |
1346 | nfsd4_record_grace_done(struct net *net, time_t boot_time) | |
1347 | { | |
1348 | if (client_tracking_ops) | |
1349 | client_tracking_ops->grace_done(net, boot_time); | |
1350 | } | |
813fd320 JL |
1351 | |
1352 | static int | |
1353 | rpc_pipefs_event(struct notifier_block *nb, unsigned long event, void *ptr) | |
1354 | { | |
1355 | struct super_block *sb = ptr; | |
1356 | struct net *net = sb->s_fs_info; | |
1357 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); | |
1358 | struct cld_net *cn = nn->cld_net; | |
1359 | struct dentry *dentry; | |
1360 | int ret = 0; | |
1361 | ||
1362 | if (!try_module_get(THIS_MODULE)) | |
1363 | return 0; | |
1364 | ||
1365 | if (!cn) { | |
1366 | module_put(THIS_MODULE); | |
1367 | return 0; | |
1368 | } | |
1369 | ||
1370 | switch (event) { | |
1371 | case RPC_PIPEFS_MOUNT: | |
1372 | dentry = nfsd4_cld_register_sb(sb, cn->cn_pipe); | |
1373 | if (IS_ERR(dentry)) { | |
1374 | ret = PTR_ERR(dentry); | |
1375 | break; | |
1376 | } | |
1377 | cn->cn_pipe->dentry = dentry; | |
1378 | break; | |
1379 | case RPC_PIPEFS_UMOUNT: | |
1380 | if (cn->cn_pipe->dentry) | |
1381 | nfsd4_cld_unregister_sb(cn->cn_pipe); | |
1382 | break; | |
1383 | default: | |
1384 | ret = -ENOTSUPP; | |
1385 | break; | |
1386 | } | |
1387 | module_put(THIS_MODULE); | |
1388 | return ret; | |
1389 | } | |
1390 | ||
2355c596 | 1391 | static struct notifier_block nfsd4_cld_block = { |
813fd320 JL |
1392 | .notifier_call = rpc_pipefs_event, |
1393 | }; | |
797a9d79 JL |
1394 | |
1395 | int | |
1396 | register_cld_notifier(void) | |
1397 | { | |
1398 | return rpc_pipefs_notifier_register(&nfsd4_cld_block); | |
1399 | } | |
1400 | ||
1401 | void | |
1402 | unregister_cld_notifier(void) | |
1403 | { | |
1404 | rpc_pipefs_notifier_unregister(&nfsd4_cld_block); | |
1405 | } |