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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 *); | |
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; |
190e4fbf | 68 | |
d84f4f99 DH |
69 | static int |
70 | nfs4_save_creds(const struct cred **original_creds) | |
190e4fbf | 71 | { |
d84f4f99 DH |
72 | struct cred *new; |
73 | ||
74 | new = prepare_creds(); | |
75 | if (!new) | |
76 | return -ENOMEM; | |
77 | ||
78 | new->fsuid = 0; | |
79 | new->fsgid = 0; | |
80 | *original_creds = override_creds(new); | |
81 | put_cred(new); | |
82 | return 0; | |
190e4fbf N |
83 | } |
84 | ||
85 | static void | |
d84f4f99 | 86 | nfs4_reset_creds(const struct cred *original) |
190e4fbf | 87 | { |
d84f4f99 | 88 | revert_creds(original); |
190e4fbf N |
89 | } |
90 | ||
a55370a3 N |
91 | static void |
92 | md5_to_hex(char *out, char *md5) | |
93 | { | |
94 | int i; | |
95 | ||
96 | for (i=0; i<16; i++) { | |
97 | unsigned char c = md5[i]; | |
98 | ||
99 | *out++ = '0' + ((c&0xf0)>>4) + (c>=0xa0)*('a'-'9'-1); | |
100 | *out++ = '0' + (c&0x0f) + ((c&0x0f)>=0x0a)*('a'-'9'-1); | |
101 | } | |
102 | *out = '\0'; | |
103 | } | |
104 | ||
b37ad28b | 105 | __be32 |
a55370a3 N |
106 | nfs4_make_rec_clidname(char *dname, struct xdr_netobj *clname) |
107 | { | |
108 | struct xdr_netobj cksum; | |
35058687 | 109 | struct hash_desc desc; |
60c74f81 | 110 | struct scatterlist sg; |
3e772463 | 111 | __be32 status = nfserr_jukebox; |
a55370a3 N |
112 | |
113 | dprintk("NFSD: nfs4_make_rec_clidname for %.*s\n", | |
114 | clname->len, clname->data); | |
35058687 HX |
115 | desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP; |
116 | desc.tfm = crypto_alloc_hash("md5", 0, CRYPTO_ALG_ASYNC); | |
117 | if (IS_ERR(desc.tfm)) | |
118 | goto out_no_tfm; | |
119 | cksum.len = crypto_hash_digestsize(desc.tfm); | |
a55370a3 N |
120 | cksum.data = kmalloc(cksum.len, GFP_KERNEL); |
121 | if (cksum.data == NULL) | |
122 | goto out; | |
a55370a3 | 123 | |
60c74f81 | 124 | sg_init_one(&sg, clname->data, clname->len); |
a55370a3 | 125 | |
60c74f81 | 126 | if (crypto_hash_digest(&desc, &sg, sg.length, cksum.data)) |
35058687 | 127 | goto out; |
a55370a3 N |
128 | |
129 | md5_to_hex(dname, cksum.data); | |
130 | ||
a55370a3 N |
131 | status = nfs_ok; |
132 | out: | |
2bd9e7b6 | 133 | kfree(cksum.data); |
35058687 HX |
134 | crypto_free_hash(desc.tfm); |
135 | out_no_tfm: | |
a55370a3 N |
136 | return status; |
137 | } | |
190e4fbf | 138 | |
2a4317c5 JL |
139 | static void |
140 | nfsd4_create_clid_dir(struct nfs4_client *clp) | |
c7b9a459 | 141 | { |
d84f4f99 | 142 | const struct cred *original_cred; |
c7b9a459 | 143 | char *dname = clp->cl_recdir; |
e970a573 | 144 | struct dentry *dir, *dentry; |
c7b9a459 N |
145 | int status; |
146 | ||
147 | dprintk("NFSD: nfsd4_create_clid_dir for \"%s\"\n", dname); | |
148 | ||
a52d726b | 149 | if (test_and_set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) |
7a6ef8c7 | 150 | return; |
b8548894 | 151 | if (!rec_file) |
7a6ef8c7 | 152 | return; |
d84f4f99 DH |
153 | status = nfs4_save_creds(&original_cred); |
154 | if (status < 0) | |
7a6ef8c7 | 155 | return; |
c7b9a459 | 156 | |
4a55c101 JK |
157 | status = mnt_want_write_file(rec_file); |
158 | if (status) | |
159 | return; | |
160 | ||
e970a573 | 161 | dir = rec_file->f_path.dentry; |
c7b9a459 | 162 | /* lock the parent */ |
e970a573 | 163 | mutex_lock(&dir->d_inode->i_mutex); |
c7b9a459 | 164 | |
e970a573 | 165 | dentry = lookup_one_len(dname, dir, HEXDIR_LEN-1); |
c7b9a459 N |
166 | if (IS_ERR(dentry)) { |
167 | status = PTR_ERR(dentry); | |
168 | goto out_unlock; | |
169 | } | |
6577aac0 | 170 | if (dentry->d_inode) |
aec39680 BF |
171 | /* |
172 | * In the 4.1 case, where we're called from | |
173 | * reclaim_complete(), records from the previous reboot | |
174 | * may still be left, so this is OK. | |
175 | * | |
176 | * In the 4.0 case, we should never get here; but we may | |
177 | * as well be forgiving and just succeed silently. | |
178 | */ | |
c7b9a459 | 179 | goto out_put; |
e970a573 | 180 | status = vfs_mkdir(dir->d_inode, dentry, S_IRWXU); |
c7b9a459 N |
181 | out_put: |
182 | dput(dentry); | |
183 | out_unlock: | |
e970a573 | 184 | mutex_unlock(&dir->d_inode->i_mutex); |
6577aac0 | 185 | if (status == 0) |
8018ab05 | 186 | vfs_fsync(rec_file, 0); |
6577aac0 BH |
187 | else |
188 | printk(KERN_ERR "NFSD: failed to write recovery record" | |
189 | " (err %d); please check that %s exists" | |
190 | " and is writeable", status, | |
191 | user_recovery_dirname); | |
4a55c101 | 192 | mnt_drop_write_file(rec_file); |
d84f4f99 | 193 | nfs4_reset_creds(original_cred); |
c7b9a459 N |
194 | } |
195 | ||
190e4fbf N |
196 | typedef int (recdir_func)(struct dentry *, struct dentry *); |
197 | ||
05f4f678 BF |
198 | struct name_list { |
199 | char name[HEXDIR_LEN]; | |
190e4fbf N |
200 | struct list_head list; |
201 | }; | |
202 | ||
190e4fbf | 203 | static int |
05f4f678 | 204 | nfsd4_build_namelist(void *arg, const char *name, int namlen, |
afefdbb2 | 205 | loff_t offset, u64 ino, unsigned int d_type) |
190e4fbf | 206 | { |
05f4f678 BF |
207 | struct list_head *names = arg; |
208 | struct name_list *entry; | |
190e4fbf | 209 | |
05f4f678 | 210 | if (namlen != HEXDIR_LEN - 1) |
b37ad28b | 211 | return 0; |
05f4f678 BF |
212 | entry = kmalloc(sizeof(struct name_list), GFP_KERNEL); |
213 | if (entry == NULL) | |
190e4fbf | 214 | return -ENOMEM; |
05f4f678 BF |
215 | memcpy(entry->name, name, HEXDIR_LEN - 1); |
216 | entry->name[HEXDIR_LEN - 1] = '\0'; | |
217 | list_add(&entry->list, names); | |
190e4fbf N |
218 | return 0; |
219 | } | |
220 | ||
221 | static int | |
5b4b299c | 222 | nfsd4_list_rec_dir(recdir_func *f) |
190e4fbf | 223 | { |
d84f4f99 | 224 | const struct cred *original_cred; |
5b4b299c | 225 | struct dentry *dir = rec_file->f_path.dentry; |
05f4f678 | 226 | LIST_HEAD(names); |
190e4fbf N |
227 | int status; |
228 | ||
d84f4f99 DH |
229 | status = nfs4_save_creds(&original_cred); |
230 | if (status < 0) | |
231 | return status; | |
190e4fbf | 232 | |
5b4b299c AV |
233 | status = vfs_llseek(rec_file, 0, SEEK_SET); |
234 | if (status < 0) { | |
235 | nfs4_reset_creds(original_cred); | |
236 | return status; | |
237 | } | |
238 | ||
239 | status = vfs_readdir(rec_file, nfsd4_build_namelist, &names); | |
8daed1e5 | 240 | mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_PARENT); |
05f4f678 | 241 | while (!list_empty(&names)) { |
5b4b299c | 242 | struct name_list *entry; |
05f4f678 | 243 | entry = list_entry(names.next, struct name_list, list); |
5b4b299c AV |
244 | if (!status) { |
245 | struct dentry *dentry; | |
246 | dentry = lookup_one_len(entry->name, dir, HEXDIR_LEN-1); | |
247 | if (IS_ERR(dentry)) { | |
248 | status = PTR_ERR(dentry); | |
249 | break; | |
250 | } | |
251 | status = f(dir, dentry); | |
252 | dput(dentry); | |
05f4f678 | 253 | } |
05f4f678 BF |
254 | list_del(&entry->list); |
255 | kfree(entry); | |
190e4fbf | 256 | } |
2f9092e1 | 257 | mutex_unlock(&dir->d_inode->i_mutex); |
d84f4f99 | 258 | nfs4_reset_creds(original_cred); |
190e4fbf N |
259 | return status; |
260 | } | |
261 | ||
c7b9a459 N |
262 | static int |
263 | nfsd4_unlink_clid_dir(char *name, int namlen) | |
264 | { | |
e970a573 | 265 | struct dentry *dir, *dentry; |
c7b9a459 N |
266 | int status; |
267 | ||
268 | dprintk("NFSD: nfsd4_unlink_clid_dir. name %.*s\n", namlen, name); | |
269 | ||
e970a573 CH |
270 | dir = rec_file->f_path.dentry; |
271 | mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_PARENT); | |
272 | dentry = lookup_one_len(name, dir, namlen); | |
c7b9a459 N |
273 | if (IS_ERR(dentry)) { |
274 | status = PTR_ERR(dentry); | |
2f9092e1 | 275 | goto out_unlock; |
c7b9a459 N |
276 | } |
277 | status = -ENOENT; | |
278 | if (!dentry->d_inode) | |
279 | goto out; | |
e970a573 | 280 | status = vfs_rmdir(dir->d_inode, dentry); |
c7b9a459 N |
281 | out: |
282 | dput(dentry); | |
2f9092e1 | 283 | out_unlock: |
e970a573 | 284 | mutex_unlock(&dir->d_inode->i_mutex); |
c7b9a459 N |
285 | return status; |
286 | } | |
287 | ||
2a4317c5 | 288 | static void |
c7b9a459 N |
289 | nfsd4_remove_clid_dir(struct nfs4_client *clp) |
290 | { | |
d84f4f99 | 291 | const struct cred *original_cred; |
c7b9a459 N |
292 | int status; |
293 | ||
a52d726b | 294 | if (!rec_file || !test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) |
c7b9a459 N |
295 | return; |
296 | ||
a561be71 | 297 | status = mnt_want_write_file(rec_file); |
0622753b DH |
298 | if (status) |
299 | goto out; | |
a52d726b | 300 | clear_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags); |
d84f4f99 DH |
301 | |
302 | status = nfs4_save_creds(&original_cred); | |
303 | if (status < 0) | |
698d8d87 | 304 | goto out_drop_write; |
d84f4f99 | 305 | |
c7b9a459 | 306 | status = nfsd4_unlink_clid_dir(clp->cl_recdir, HEXDIR_LEN-1); |
d84f4f99 | 307 | nfs4_reset_creds(original_cred); |
c7b9a459 | 308 | if (status == 0) |
8018ab05 | 309 | vfs_fsync(rec_file, 0); |
698d8d87 | 310 | out_drop_write: |
2a79f17e | 311 | mnt_drop_write_file(rec_file); |
0622753b | 312 | out: |
c7b9a459 N |
313 | if (status) |
314 | printk("NFSD: Failed to remove expired client state directory" | |
315 | " %.*s\n", HEXDIR_LEN, clp->cl_recdir); | |
c7b9a459 N |
316 | } |
317 | ||
318 | static int | |
319 | purge_old(struct dentry *parent, struct dentry *child) | |
320 | { | |
321 | int status; | |
322 | ||
a0af710a | 323 | if (nfs4_has_reclaimed_state(child->d_name.name)) |
b37ad28b | 324 | return 0; |
c7b9a459 | 325 | |
2f9092e1 | 326 | status = vfs_rmdir(parent->d_inode, child); |
c7b9a459 N |
327 | if (status) |
328 | printk("failed to remove client recovery directory %s\n", | |
329 | child->d_name.name); | |
330 | /* Keep trying, success or failure: */ | |
b37ad28b | 331 | return 0; |
c7b9a459 N |
332 | } |
333 | ||
2a4317c5 JL |
334 | static void |
335 | nfsd4_recdir_purge_old(struct net *net, time_t boot_time) | |
336 | { | |
c7b9a459 N |
337 | int status; |
338 | ||
e970a573 | 339 | if (!rec_file) |
c7b9a459 | 340 | return; |
a561be71 | 341 | status = mnt_want_write_file(rec_file); |
0622753b DH |
342 | if (status) |
343 | goto out; | |
5b4b299c | 344 | status = nfsd4_list_rec_dir(purge_old); |
c7b9a459 | 345 | if (status == 0) |
8018ab05 | 346 | vfs_fsync(rec_file, 0); |
2a79f17e | 347 | mnt_drop_write_file(rec_file); |
0622753b | 348 | out: |
c7b9a459 N |
349 | if (status) |
350 | printk("nfsd4: failed to purge old clients from recovery" | |
e970a573 | 351 | " directory %s\n", rec_file->f_path.dentry->d_name.name); |
c7b9a459 N |
352 | } |
353 | ||
190e4fbf N |
354 | static int |
355 | load_recdir(struct dentry *parent, struct dentry *child) | |
356 | { | |
357 | if (child->d_name.len != HEXDIR_LEN - 1) { | |
358 | printk("nfsd4: illegal name %s in recovery directory\n", | |
359 | child->d_name.name); | |
360 | /* Keep trying; maybe the others are OK: */ | |
b37ad28b | 361 | return 0; |
190e4fbf N |
362 | } |
363 | nfs4_client_to_reclaim(child->d_name.name); | |
b37ad28b | 364 | return 0; |
190e4fbf N |
365 | } |
366 | ||
2a4317c5 | 367 | static int |
190e4fbf N |
368 | nfsd4_recdir_load(void) { |
369 | int status; | |
370 | ||
e970a573 CH |
371 | if (!rec_file) |
372 | return 0; | |
373 | ||
5b4b299c | 374 | status = nfsd4_list_rec_dir(load_recdir); |
190e4fbf N |
375 | if (status) |
376 | printk("nfsd4: failed loading clients from recovery" | |
e970a573 | 377 | " directory %s\n", rec_file->f_path.dentry->d_name.name); |
190e4fbf N |
378 | return status; |
379 | } | |
380 | ||
381 | /* | |
382 | * Hold reference to the recovery directory. | |
383 | */ | |
384 | ||
2a4317c5 JL |
385 | static int |
386 | nfsd4_init_recdir(void) | |
190e4fbf | 387 | { |
d84f4f99 DH |
388 | const struct cred *original_cred; |
389 | int status; | |
190e4fbf N |
390 | |
391 | printk("NFSD: Using %s as the NFSv4 state recovery directory\n", | |
48483bf2 | 392 | user_recovery_dirname); |
190e4fbf | 393 | |
e970a573 | 394 | BUG_ON(rec_file); |
190e4fbf | 395 | |
d84f4f99 DH |
396 | status = nfs4_save_creds(&original_cred); |
397 | if (status < 0) { | |
398 | printk("NFSD: Unable to change credentials to find recovery" | |
399 | " directory: error %d\n", | |
400 | status); | |
2a4317c5 | 401 | return status; |
d84f4f99 | 402 | } |
190e4fbf | 403 | |
48483bf2 | 404 | rec_file = filp_open(user_recovery_dirname, O_RDONLY | O_DIRECTORY, 0); |
e970a573 | 405 | if (IS_ERR(rec_file)) { |
c2642ab0 | 406 | printk("NFSD: unable to find recovery directory %s\n", |
48483bf2 | 407 | user_recovery_dirname); |
2a4317c5 | 408 | status = PTR_ERR(rec_file); |
e970a573 CH |
409 | rec_file = NULL; |
410 | } | |
190e4fbf | 411 | |
d84f4f99 | 412 | nfs4_reset_creds(original_cred); |
2a4317c5 | 413 | return status; |
190e4fbf N |
414 | } |
415 | ||
2a4317c5 JL |
416 | static int |
417 | nfsd4_load_reboot_recovery_data(struct net *net) | |
418 | { | |
419 | int status; | |
420 | ||
cc27e0d4 JL |
421 | /* XXX: The legacy code won't work in a container */ |
422 | if (net != &init_net) { | |
423 | WARN(1, KERN_ERR "NFSD: attempt to initialize legacy client " | |
424 | "tracking in a container!\n"); | |
425 | return -EINVAL; | |
426 | } | |
427 | ||
2a4317c5 JL |
428 | nfs4_lock_state(); |
429 | status = nfsd4_init_recdir(); | |
430 | if (!status) | |
431 | status = nfsd4_recdir_load(); | |
432 | nfs4_unlock_state(); | |
433 | if (status) | |
434 | printk(KERN_ERR "NFSD: Failure reading reboot recovery data\n"); | |
435 | return status; | |
436 | } | |
437 | ||
438 | static void | |
190e4fbf N |
439 | nfsd4_shutdown_recdir(void) |
440 | { | |
e970a573 | 441 | if (!rec_file) |
190e4fbf | 442 | return; |
e970a573 CH |
443 | fput(rec_file); |
444 | rec_file = NULL; | |
190e4fbf | 445 | } |
48483bf2 | 446 | |
2a4317c5 JL |
447 | static void |
448 | nfsd4_legacy_tracking_exit(struct net *net) | |
449 | { | |
450 | nfs4_release_reclaim(); | |
451 | nfsd4_shutdown_recdir(); | |
452 | } | |
453 | ||
48483bf2 BF |
454 | /* |
455 | * Change the NFSv4 recovery directory to recdir. | |
456 | */ | |
457 | int | |
458 | nfs4_reset_recoverydir(char *recdir) | |
459 | { | |
460 | int status; | |
461 | struct path path; | |
462 | ||
463 | status = kern_path(recdir, LOOKUP_FOLLOW, &path); | |
464 | if (status) | |
465 | return status; | |
466 | status = -ENOTDIR; | |
467 | if (S_ISDIR(path.dentry->d_inode->i_mode)) { | |
468 | strcpy(user_recovery_dirname, recdir); | |
469 | status = 0; | |
470 | } | |
471 | path_put(&path); | |
472 | return status; | |
473 | } | |
474 | ||
475 | char * | |
476 | nfs4_recoverydir(void) | |
477 | { | |
478 | return user_recovery_dirname; | |
479 | } | |
2a4317c5 JL |
480 | |
481 | static int | |
482 | nfsd4_check_legacy_client(struct nfs4_client *clp) | |
483 | { | |
484 | /* did we already find that this client is stable? */ | |
485 | if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) | |
486 | return 0; | |
487 | ||
488 | /* look for it in the reclaim hashtable otherwise */ | |
489 | if (nfsd4_find_reclaim_client(clp)) { | |
490 | set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags); | |
491 | return 0; | |
492 | } | |
493 | ||
494 | return -ENOENT; | |
495 | } | |
496 | ||
497 | static struct nfsd4_client_tracking_ops nfsd4_legacy_tracking_ops = { | |
498 | .init = nfsd4_load_reboot_recovery_data, | |
499 | .exit = nfsd4_legacy_tracking_exit, | |
500 | .create = nfsd4_create_clid_dir, | |
501 | .remove = nfsd4_remove_clid_dir, | |
502 | .check = nfsd4_check_legacy_client, | |
503 | .grace_done = nfsd4_recdir_purge_old, | |
504 | }; | |
505 | ||
f3f80148 JL |
506 | /* Globals */ |
507 | #define NFSD_PIPE_DIR "nfsd" | |
508 | #define NFSD_CLD_PIPE "cld" | |
509 | ||
510 | /* per-net-ns structure for holding cld upcall info */ | |
511 | struct cld_net { | |
512 | struct rpc_pipe *cn_pipe; | |
513 | spinlock_t cn_lock; | |
514 | struct list_head cn_list; | |
515 | unsigned int cn_xid; | |
516 | }; | |
517 | ||
518 | struct cld_upcall { | |
519 | struct list_head cu_list; | |
520 | struct cld_net *cu_net; | |
521 | struct task_struct *cu_task; | |
522 | struct cld_msg cu_msg; | |
523 | }; | |
524 | ||
525 | static int | |
526 | __cld_pipe_upcall(struct rpc_pipe *pipe, struct cld_msg *cmsg) | |
527 | { | |
528 | int ret; | |
529 | struct rpc_pipe_msg msg; | |
530 | ||
531 | memset(&msg, 0, sizeof(msg)); | |
532 | msg.data = cmsg; | |
533 | msg.len = sizeof(*cmsg); | |
534 | ||
535 | /* | |
536 | * Set task state before we queue the upcall. That prevents | |
537 | * wake_up_process in the downcall from racing with schedule. | |
538 | */ | |
539 | set_current_state(TASK_UNINTERRUPTIBLE); | |
540 | ret = rpc_queue_upcall(pipe, &msg); | |
541 | if (ret < 0) { | |
542 | set_current_state(TASK_RUNNING); | |
543 | goto out; | |
544 | } | |
545 | ||
546 | schedule(); | |
547 | set_current_state(TASK_RUNNING); | |
548 | ||
549 | if (msg.errno < 0) | |
550 | ret = msg.errno; | |
551 | out: | |
552 | return ret; | |
553 | } | |
554 | ||
555 | static int | |
556 | cld_pipe_upcall(struct rpc_pipe *pipe, struct cld_msg *cmsg) | |
557 | { | |
558 | int ret; | |
559 | ||
560 | /* | |
561 | * -EAGAIN occurs when pipe is closed and reopened while there are | |
562 | * upcalls queued. | |
563 | */ | |
564 | do { | |
565 | ret = __cld_pipe_upcall(pipe, cmsg); | |
566 | } while (ret == -EAGAIN); | |
567 | ||
568 | return ret; | |
569 | } | |
570 | ||
571 | static ssize_t | |
572 | cld_pipe_downcall(struct file *filp, const char __user *src, size_t mlen) | |
573 | { | |
574 | struct cld_upcall *tmp, *cup; | |
bc1b542b | 575 | struct cld_msg __user *cmsg = (struct cld_msg __user *)src; |
f3f80148 JL |
576 | uint32_t xid; |
577 | struct nfsd_net *nn = net_generic(filp->f_dentry->d_sb->s_fs_info, | |
578 | nfsd_net_id); | |
579 | struct cld_net *cn = nn->cld_net; | |
580 | ||
581 | if (mlen != sizeof(*cmsg)) { | |
8a7dc4b0 | 582 | dprintk("%s: got %zu bytes, expected %zu\n", __func__, mlen, |
f3f80148 JL |
583 | sizeof(*cmsg)); |
584 | return -EINVAL; | |
585 | } | |
586 | ||
587 | /* copy just the xid so we can try to find that */ | |
588 | if (copy_from_user(&xid, &cmsg->cm_xid, sizeof(xid)) != 0) { | |
589 | dprintk("%s: error when copying xid from userspace", __func__); | |
590 | return -EFAULT; | |
591 | } | |
592 | ||
593 | /* walk the list and find corresponding xid */ | |
594 | cup = NULL; | |
595 | spin_lock(&cn->cn_lock); | |
596 | list_for_each_entry(tmp, &cn->cn_list, cu_list) { | |
597 | if (get_unaligned(&tmp->cu_msg.cm_xid) == xid) { | |
598 | cup = tmp; | |
599 | list_del_init(&cup->cu_list); | |
600 | break; | |
601 | } | |
602 | } | |
603 | spin_unlock(&cn->cn_lock); | |
604 | ||
605 | /* couldn't find upcall? */ | |
606 | if (!cup) { | |
21f72c9f | 607 | dprintk("%s: couldn't find upcall -- xid=%u\n", __func__, xid); |
f3f80148 JL |
608 | return -EINVAL; |
609 | } | |
610 | ||
611 | if (copy_from_user(&cup->cu_msg, src, mlen) != 0) | |
612 | return -EFAULT; | |
613 | ||
614 | wake_up_process(cup->cu_task); | |
615 | return mlen; | |
616 | } | |
617 | ||
618 | static void | |
619 | cld_pipe_destroy_msg(struct rpc_pipe_msg *msg) | |
620 | { | |
621 | struct cld_msg *cmsg = msg->data; | |
622 | struct cld_upcall *cup = container_of(cmsg, struct cld_upcall, | |
623 | cu_msg); | |
624 | ||
625 | /* errno >= 0 means we got a downcall */ | |
626 | if (msg->errno >= 0) | |
627 | return; | |
628 | ||
629 | wake_up_process(cup->cu_task); | |
630 | } | |
631 | ||
632 | static const struct rpc_pipe_ops cld_upcall_ops = { | |
633 | .upcall = rpc_pipe_generic_upcall, | |
634 | .downcall = cld_pipe_downcall, | |
635 | .destroy_msg = cld_pipe_destroy_msg, | |
636 | }; | |
637 | ||
638 | static struct dentry * | |
639 | nfsd4_cld_register_sb(struct super_block *sb, struct rpc_pipe *pipe) | |
640 | { | |
641 | struct dentry *dir, *dentry; | |
642 | ||
643 | dir = rpc_d_lookup_sb(sb, NFSD_PIPE_DIR); | |
644 | if (dir == NULL) | |
645 | return ERR_PTR(-ENOENT); | |
646 | dentry = rpc_mkpipe_dentry(dir, NFSD_CLD_PIPE, NULL, pipe); | |
647 | dput(dir); | |
648 | return dentry; | |
649 | } | |
650 | ||
651 | static void | |
652 | nfsd4_cld_unregister_sb(struct rpc_pipe *pipe) | |
653 | { | |
654 | if (pipe->dentry) | |
655 | rpc_unlink(pipe->dentry); | |
656 | } | |
657 | ||
658 | static struct dentry * | |
659 | nfsd4_cld_register_net(struct net *net, struct rpc_pipe *pipe) | |
660 | { | |
661 | struct super_block *sb; | |
662 | struct dentry *dentry; | |
663 | ||
664 | sb = rpc_get_sb_net(net); | |
665 | if (!sb) | |
666 | return NULL; | |
667 | dentry = nfsd4_cld_register_sb(sb, pipe); | |
668 | rpc_put_sb_net(net); | |
669 | return dentry; | |
670 | } | |
671 | ||
672 | static void | |
673 | nfsd4_cld_unregister_net(struct net *net, struct rpc_pipe *pipe) | |
674 | { | |
675 | struct super_block *sb; | |
676 | ||
677 | sb = rpc_get_sb_net(net); | |
678 | if (sb) { | |
679 | nfsd4_cld_unregister_sb(pipe); | |
680 | rpc_put_sb_net(net); | |
681 | } | |
682 | } | |
683 | ||
684 | /* Initialize rpc_pipefs pipe for communication with client tracking daemon */ | |
685 | static int | |
686 | nfsd4_init_cld_pipe(struct net *net) | |
687 | { | |
688 | int ret; | |
689 | struct dentry *dentry; | |
690 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); | |
691 | struct cld_net *cn; | |
692 | ||
693 | if (nn->cld_net) | |
694 | return 0; | |
695 | ||
696 | cn = kzalloc(sizeof(*cn), GFP_KERNEL); | |
697 | if (!cn) { | |
698 | ret = -ENOMEM; | |
699 | goto err; | |
700 | } | |
701 | ||
702 | cn->cn_pipe = rpc_mkpipe_data(&cld_upcall_ops, RPC_PIPE_WAIT_FOR_OPEN); | |
703 | if (IS_ERR(cn->cn_pipe)) { | |
704 | ret = PTR_ERR(cn->cn_pipe); | |
705 | goto err; | |
706 | } | |
707 | spin_lock_init(&cn->cn_lock); | |
708 | INIT_LIST_HEAD(&cn->cn_list); | |
709 | ||
710 | dentry = nfsd4_cld_register_net(net, cn->cn_pipe); | |
711 | if (IS_ERR(dentry)) { | |
712 | ret = PTR_ERR(dentry); | |
713 | goto err_destroy_data; | |
714 | } | |
715 | ||
716 | cn->cn_pipe->dentry = dentry; | |
717 | nn->cld_net = cn; | |
718 | return 0; | |
719 | ||
720 | err_destroy_data: | |
721 | rpc_destroy_pipe_data(cn->cn_pipe); | |
722 | err: | |
723 | kfree(cn); | |
724 | printk(KERN_ERR "NFSD: unable to create nfsdcld upcall pipe (%d)\n", | |
725 | ret); | |
726 | return ret; | |
727 | } | |
728 | ||
729 | static void | |
730 | nfsd4_remove_cld_pipe(struct net *net) | |
731 | { | |
732 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); | |
733 | struct cld_net *cn = nn->cld_net; | |
734 | ||
735 | nfsd4_cld_unregister_net(net, cn->cn_pipe); | |
736 | rpc_destroy_pipe_data(cn->cn_pipe); | |
737 | kfree(nn->cld_net); | |
738 | nn->cld_net = NULL; | |
739 | } | |
740 | ||
741 | static struct cld_upcall * | |
742 | alloc_cld_upcall(struct cld_net *cn) | |
743 | { | |
744 | struct cld_upcall *new, *tmp; | |
745 | ||
746 | new = kzalloc(sizeof(*new), GFP_KERNEL); | |
747 | if (!new) | |
748 | return new; | |
749 | ||
750 | /* FIXME: hard cap on number in flight? */ | |
751 | restart_search: | |
752 | spin_lock(&cn->cn_lock); | |
753 | list_for_each_entry(tmp, &cn->cn_list, cu_list) { | |
754 | if (tmp->cu_msg.cm_xid == cn->cn_xid) { | |
755 | cn->cn_xid++; | |
756 | spin_unlock(&cn->cn_lock); | |
757 | goto restart_search; | |
758 | } | |
759 | } | |
760 | new->cu_task = current; | |
761 | new->cu_msg.cm_vers = CLD_UPCALL_VERSION; | |
762 | put_unaligned(cn->cn_xid++, &new->cu_msg.cm_xid); | |
763 | new->cu_net = cn; | |
764 | list_add(&new->cu_list, &cn->cn_list); | |
765 | spin_unlock(&cn->cn_lock); | |
766 | ||
767 | dprintk("%s: allocated xid %u\n", __func__, new->cu_msg.cm_xid); | |
768 | ||
769 | return new; | |
770 | } | |
771 | ||
772 | static void | |
773 | free_cld_upcall(struct cld_upcall *victim) | |
774 | { | |
775 | struct cld_net *cn = victim->cu_net; | |
776 | ||
777 | spin_lock(&cn->cn_lock); | |
778 | list_del(&victim->cu_list); | |
779 | spin_unlock(&cn->cn_lock); | |
780 | kfree(victim); | |
781 | } | |
782 | ||
783 | /* Ask daemon to create a new record */ | |
784 | static void | |
785 | nfsd4_cld_create(struct nfs4_client *clp) | |
786 | { | |
787 | int ret; | |
788 | struct cld_upcall *cup; | |
789 | /* FIXME: determine net from clp */ | |
790 | struct nfsd_net *nn = net_generic(&init_net, nfsd_net_id); | |
791 | struct cld_net *cn = nn->cld_net; | |
792 | ||
793 | /* Don't upcall if it's already stored */ | |
794 | if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) | |
795 | return; | |
796 | ||
797 | cup = alloc_cld_upcall(cn); | |
798 | if (!cup) { | |
799 | ret = -ENOMEM; | |
800 | goto out_err; | |
801 | } | |
802 | ||
803 | cup->cu_msg.cm_cmd = Cld_Create; | |
804 | cup->cu_msg.cm_u.cm_name.cn_len = clp->cl_name.len; | |
805 | memcpy(cup->cu_msg.cm_u.cm_name.cn_id, clp->cl_name.data, | |
806 | clp->cl_name.len); | |
807 | ||
808 | ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_msg); | |
809 | if (!ret) { | |
810 | ret = cup->cu_msg.cm_status; | |
811 | set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags); | |
812 | } | |
813 | ||
814 | free_cld_upcall(cup); | |
815 | out_err: | |
816 | if (ret) | |
817 | printk(KERN_ERR "NFSD: Unable to create client " | |
818 | "record on stable storage: %d\n", ret); | |
819 | } | |
820 | ||
821 | /* Ask daemon to create a new record */ | |
822 | static void | |
823 | nfsd4_cld_remove(struct nfs4_client *clp) | |
824 | { | |
825 | int ret; | |
826 | struct cld_upcall *cup; | |
827 | /* FIXME: determine net from clp */ | |
828 | struct nfsd_net *nn = net_generic(&init_net, nfsd_net_id); | |
829 | struct cld_net *cn = nn->cld_net; | |
830 | ||
831 | /* Don't upcall if it's already removed */ | |
832 | if (!test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) | |
833 | return; | |
834 | ||
835 | cup = alloc_cld_upcall(cn); | |
836 | if (!cup) { | |
837 | ret = -ENOMEM; | |
838 | goto out_err; | |
839 | } | |
840 | ||
841 | cup->cu_msg.cm_cmd = Cld_Remove; | |
842 | cup->cu_msg.cm_u.cm_name.cn_len = clp->cl_name.len; | |
843 | memcpy(cup->cu_msg.cm_u.cm_name.cn_id, clp->cl_name.data, | |
844 | clp->cl_name.len); | |
845 | ||
846 | ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_msg); | |
847 | if (!ret) { | |
848 | ret = cup->cu_msg.cm_status; | |
849 | clear_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags); | |
850 | } | |
851 | ||
852 | free_cld_upcall(cup); | |
853 | out_err: | |
854 | if (ret) | |
855 | printk(KERN_ERR "NFSD: Unable to remove client " | |
856 | "record from stable storage: %d\n", ret); | |
857 | } | |
858 | ||
859 | /* Check for presence of a record, and update its timestamp */ | |
860 | static int | |
861 | nfsd4_cld_check(struct nfs4_client *clp) | |
862 | { | |
863 | int ret; | |
864 | struct cld_upcall *cup; | |
865 | /* FIXME: determine net from clp */ | |
866 | struct nfsd_net *nn = net_generic(&init_net, nfsd_net_id); | |
867 | struct cld_net *cn = nn->cld_net; | |
868 | ||
869 | /* Don't upcall if one was already stored during this grace pd */ | |
870 | if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) | |
871 | return 0; | |
872 | ||
873 | cup = alloc_cld_upcall(cn); | |
874 | if (!cup) { | |
875 | printk(KERN_ERR "NFSD: Unable to check client record on " | |
876 | "stable storage: %d\n", -ENOMEM); | |
877 | return -ENOMEM; | |
878 | } | |
879 | ||
880 | cup->cu_msg.cm_cmd = Cld_Check; | |
881 | cup->cu_msg.cm_u.cm_name.cn_len = clp->cl_name.len; | |
882 | memcpy(cup->cu_msg.cm_u.cm_name.cn_id, clp->cl_name.data, | |
883 | clp->cl_name.len); | |
884 | ||
885 | ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_msg); | |
886 | if (!ret) { | |
887 | ret = cup->cu_msg.cm_status; | |
888 | set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags); | |
889 | } | |
890 | ||
891 | free_cld_upcall(cup); | |
892 | return ret; | |
893 | } | |
894 | ||
895 | static void | |
896 | nfsd4_cld_grace_done(struct net *net, time_t boot_time) | |
897 | { | |
898 | int ret; | |
899 | struct cld_upcall *cup; | |
900 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); | |
901 | struct cld_net *cn = nn->cld_net; | |
902 | ||
903 | cup = alloc_cld_upcall(cn); | |
904 | if (!cup) { | |
905 | ret = -ENOMEM; | |
906 | goto out_err; | |
907 | } | |
908 | ||
909 | cup->cu_msg.cm_cmd = Cld_GraceDone; | |
910 | cup->cu_msg.cm_u.cm_gracetime = (int64_t)boot_time; | |
911 | ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_msg); | |
912 | if (!ret) | |
913 | ret = cup->cu_msg.cm_status; | |
914 | ||
915 | free_cld_upcall(cup); | |
916 | out_err: | |
917 | if (ret) | |
918 | printk(KERN_ERR "NFSD: Unable to end grace period: %d\n", ret); | |
919 | } | |
920 | ||
921 | static struct nfsd4_client_tracking_ops nfsd4_cld_tracking_ops = { | |
922 | .init = nfsd4_init_cld_pipe, | |
923 | .exit = nfsd4_remove_cld_pipe, | |
924 | .create = nfsd4_cld_create, | |
925 | .remove = nfsd4_cld_remove, | |
926 | .check = nfsd4_cld_check, | |
927 | .grace_done = nfsd4_cld_grace_done, | |
928 | }; | |
929 | ||
2873d214 JL |
930 | /* upcall via usermodehelper */ |
931 | static char cltrack_prog[PATH_MAX] = "/sbin/nfsdcltrack"; | |
932 | module_param_string(cltrack_prog, cltrack_prog, sizeof(cltrack_prog), | |
933 | S_IRUGO|S_IWUSR); | |
934 | MODULE_PARM_DESC(cltrack_prog, "Path to the nfsdcltrack upcall program"); | |
935 | ||
936 | static int | |
937 | nfsd4_umh_cltrack_upcall(char *cmd, char *arg) | |
938 | { | |
939 | char *envp[] = { NULL }; | |
940 | char *argv[4]; | |
941 | int ret; | |
942 | ||
943 | if (unlikely(!cltrack_prog[0])) { | |
944 | dprintk("%s: cltrack_prog is disabled\n", __func__); | |
945 | return -EACCES; | |
946 | } | |
947 | ||
948 | dprintk("%s: cmd: %s\n", __func__, cmd); | |
949 | dprintk("%s: arg: %s\n", __func__, arg ? arg : "(null)"); | |
950 | ||
951 | argv[0] = (char *)cltrack_prog; | |
952 | argv[1] = cmd; | |
953 | argv[2] = arg; | |
954 | argv[3] = NULL; | |
955 | ||
956 | ret = call_usermodehelper(argv[0], argv, envp, UMH_WAIT_PROC); | |
957 | /* | |
958 | * Disable the upcall mechanism if we're getting an ENOENT or EACCES | |
959 | * error. The admin can re-enable it on the fly by using sysfs | |
960 | * once the problem has been fixed. | |
961 | */ | |
962 | if (ret == -ENOENT || ret == -EACCES) { | |
963 | dprintk("NFSD: %s was not found or isn't executable (%d). " | |
964 | "Setting cltrack_prog to blank string!", | |
965 | cltrack_prog, ret); | |
966 | cltrack_prog[0] = '\0'; | |
967 | } | |
968 | dprintk("%s: %s return value: %d\n", __func__, cltrack_prog, ret); | |
969 | ||
970 | return ret; | |
971 | } | |
972 | ||
973 | static char * | |
974 | bin_to_hex_dup(const unsigned char *src, int srclen) | |
975 | { | |
976 | int i; | |
977 | char *buf, *hex; | |
978 | ||
979 | /* +1 for terminating NULL */ | |
980 | buf = kmalloc((srclen * 2) + 1, GFP_KERNEL); | |
981 | if (!buf) | |
982 | return buf; | |
983 | ||
984 | hex = buf; | |
985 | for (i = 0; i < srclen; i++) { | |
986 | sprintf(hex, "%2.2x", *src++); | |
987 | hex += 2; | |
988 | } | |
989 | return buf; | |
990 | } | |
991 | ||
992 | static int | |
993 | nfsd4_umh_cltrack_init(struct net __attribute__((unused)) *net) | |
994 | { | |
995 | return nfsd4_umh_cltrack_upcall("init", NULL); | |
996 | } | |
997 | ||
998 | static void | |
999 | nfsd4_umh_cltrack_create(struct nfs4_client *clp) | |
1000 | { | |
1001 | char *hexid; | |
1002 | ||
1003 | hexid = bin_to_hex_dup(clp->cl_name.data, clp->cl_name.len); | |
1004 | if (!hexid) { | |
1005 | dprintk("%s: can't allocate memory for upcall!\n", __func__); | |
1006 | return; | |
1007 | } | |
1008 | nfsd4_umh_cltrack_upcall("create", hexid); | |
1009 | kfree(hexid); | |
1010 | } | |
1011 | ||
1012 | static void | |
1013 | nfsd4_umh_cltrack_remove(struct nfs4_client *clp) | |
1014 | { | |
1015 | char *hexid; | |
1016 | ||
1017 | hexid = bin_to_hex_dup(clp->cl_name.data, clp->cl_name.len); | |
1018 | if (!hexid) { | |
1019 | dprintk("%s: can't allocate memory for upcall!\n", __func__); | |
1020 | return; | |
1021 | } | |
1022 | nfsd4_umh_cltrack_upcall("remove", hexid); | |
1023 | kfree(hexid); | |
1024 | } | |
1025 | ||
1026 | static int | |
1027 | nfsd4_umh_cltrack_check(struct nfs4_client *clp) | |
1028 | { | |
1029 | int ret; | |
1030 | char *hexid; | |
1031 | ||
1032 | hexid = bin_to_hex_dup(clp->cl_name.data, clp->cl_name.len); | |
1033 | if (!hexid) { | |
1034 | dprintk("%s: can't allocate memory for upcall!\n", __func__); | |
1035 | return -ENOMEM; | |
1036 | } | |
1037 | ret = nfsd4_umh_cltrack_upcall("check", hexid); | |
1038 | kfree(hexid); | |
1039 | return ret; | |
1040 | } | |
1041 | ||
1042 | static void | |
1043 | nfsd4_umh_cltrack_grace_done(struct net __attribute__((unused)) *net, | |
1044 | time_t boot_time) | |
1045 | { | |
1046 | char timestr[22]; /* FIXME: better way to determine max size? */ | |
1047 | ||
1048 | sprintf(timestr, "%ld", boot_time); | |
1049 | nfsd4_umh_cltrack_upcall("gracedone", timestr); | |
1050 | } | |
1051 | ||
1052 | static struct nfsd4_client_tracking_ops nfsd4_umh_tracking_ops = { | |
1053 | .init = nfsd4_umh_cltrack_init, | |
1054 | .exit = NULL, | |
1055 | .create = nfsd4_umh_cltrack_create, | |
1056 | .remove = nfsd4_umh_cltrack_remove, | |
1057 | .check = nfsd4_umh_cltrack_check, | |
1058 | .grace_done = nfsd4_umh_cltrack_grace_done, | |
1059 | }; | |
1060 | ||
2a4317c5 JL |
1061 | int |
1062 | nfsd4_client_tracking_init(struct net *net) | |
1063 | { | |
1064 | int status; | |
f3f80148 | 1065 | struct path path; |
2a4317c5 | 1066 | |
f3f80148 JL |
1067 | if (!client_tracking_ops) { |
1068 | client_tracking_ops = &nfsd4_cld_tracking_ops; | |
1069 | status = kern_path(nfs4_recoverydir(), LOOKUP_FOLLOW, &path); | |
1070 | if (!status) { | |
1071 | if (S_ISDIR(path.dentry->d_inode->i_mode)) | |
1072 | client_tracking_ops = | |
1073 | &nfsd4_legacy_tracking_ops; | |
1074 | path_put(&path); | |
1075 | } | |
1076 | } | |
2a4317c5 JL |
1077 | |
1078 | status = client_tracking_ops->init(net); | |
1079 | if (status) { | |
1080 | printk(KERN_WARNING "NFSD: Unable to initialize client " | |
1081 | "recovery tracking! (%d)\n", status); | |
1082 | client_tracking_ops = NULL; | |
1083 | } | |
1084 | return status; | |
1085 | } | |
1086 | ||
1087 | void | |
1088 | nfsd4_client_tracking_exit(struct net *net) | |
1089 | { | |
1090 | if (client_tracking_ops) { | |
2873d214 JL |
1091 | if (client_tracking_ops->exit) |
1092 | client_tracking_ops->exit(net); | |
2a4317c5 JL |
1093 | client_tracking_ops = NULL; |
1094 | } | |
1095 | } | |
1096 | ||
1097 | void | |
1098 | nfsd4_client_record_create(struct nfs4_client *clp) | |
1099 | { | |
1100 | if (client_tracking_ops) | |
1101 | client_tracking_ops->create(clp); | |
1102 | } | |
1103 | ||
1104 | void | |
1105 | nfsd4_client_record_remove(struct nfs4_client *clp) | |
1106 | { | |
1107 | if (client_tracking_ops) | |
1108 | client_tracking_ops->remove(clp); | |
1109 | } | |
1110 | ||
1111 | int | |
1112 | nfsd4_client_record_check(struct nfs4_client *clp) | |
1113 | { | |
1114 | if (client_tracking_ops) | |
1115 | return client_tracking_ops->check(clp); | |
1116 | ||
1117 | return -EOPNOTSUPP; | |
1118 | } | |
1119 | ||
1120 | void | |
1121 | nfsd4_record_grace_done(struct net *net, time_t boot_time) | |
1122 | { | |
1123 | if (client_tracking_ops) | |
1124 | client_tracking_ops->grace_done(net, boot_time); | |
1125 | } | |
813fd320 JL |
1126 | |
1127 | static int | |
1128 | rpc_pipefs_event(struct notifier_block *nb, unsigned long event, void *ptr) | |
1129 | { | |
1130 | struct super_block *sb = ptr; | |
1131 | struct net *net = sb->s_fs_info; | |
1132 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); | |
1133 | struct cld_net *cn = nn->cld_net; | |
1134 | struct dentry *dentry; | |
1135 | int ret = 0; | |
1136 | ||
1137 | if (!try_module_get(THIS_MODULE)) | |
1138 | return 0; | |
1139 | ||
1140 | if (!cn) { | |
1141 | module_put(THIS_MODULE); | |
1142 | return 0; | |
1143 | } | |
1144 | ||
1145 | switch (event) { | |
1146 | case RPC_PIPEFS_MOUNT: | |
1147 | dentry = nfsd4_cld_register_sb(sb, cn->cn_pipe); | |
1148 | if (IS_ERR(dentry)) { | |
1149 | ret = PTR_ERR(dentry); | |
1150 | break; | |
1151 | } | |
1152 | cn->cn_pipe->dentry = dentry; | |
1153 | break; | |
1154 | case RPC_PIPEFS_UMOUNT: | |
1155 | if (cn->cn_pipe->dentry) | |
1156 | nfsd4_cld_unregister_sb(cn->cn_pipe); | |
1157 | break; | |
1158 | default: | |
1159 | ret = -ENOTSUPP; | |
1160 | break; | |
1161 | } | |
1162 | module_put(THIS_MODULE); | |
1163 | return ret; | |
1164 | } | |
1165 | ||
2355c596 | 1166 | static struct notifier_block nfsd4_cld_block = { |
813fd320 JL |
1167 | .notifier_call = rpc_pipefs_event, |
1168 | }; | |
797a9d79 JL |
1169 | |
1170 | int | |
1171 | register_cld_notifier(void) | |
1172 | { | |
1173 | return rpc_pipefs_notifier_register(&nfsd4_cld_block); | |
1174 | } | |
1175 | ||
1176 | void | |
1177 | unregister_cld_notifier(void) | |
1178 | { | |
1179 | rpc_pipefs_notifier_unregister(&nfsd4_cld_block); | |
1180 | } |