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 | ||
b37ad28b | 106 | __be32 |
a55370a3 N |
107 | nfs4_make_rec_clidname(char *dname, struct xdr_netobj *clname) |
108 | { | |
109 | struct xdr_netobj cksum; | |
35058687 | 110 | struct hash_desc desc; |
60c74f81 | 111 | struct scatterlist sg; |
3e772463 | 112 | __be32 status = nfserr_jukebox; |
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); | |
118 | if (IS_ERR(desc.tfm)) | |
119 | goto out_no_tfm; | |
120 | cksum.len = crypto_hash_digestsize(desc.tfm); | |
a55370a3 N |
121 | cksum.data = kmalloc(cksum.len, GFP_KERNEL); |
122 | if (cksum.data == NULL) | |
123 | goto out; | |
a55370a3 | 124 | |
60c74f81 | 125 | sg_init_one(&sg, clname->data, clname->len); |
a55370a3 | 126 | |
60c74f81 | 127 | if (crypto_hash_digest(&desc, &sg, sg.length, cksum.data)) |
35058687 | 128 | goto out; |
a55370a3 N |
129 | |
130 | md5_to_hex(dname, cksum.data); | |
131 | ||
a55370a3 N |
132 | status = nfs_ok; |
133 | out: | |
2bd9e7b6 | 134 | kfree(cksum.data); |
35058687 HX |
135 | crypto_free_hash(desc.tfm); |
136 | out_no_tfm: | |
a55370a3 N |
137 | return status; |
138 | } | |
190e4fbf | 139 | |
2a4317c5 JL |
140 | static void |
141 | nfsd4_create_clid_dir(struct nfs4_client *clp) | |
c7b9a459 | 142 | { |
d84f4f99 | 143 | const struct cred *original_cred; |
c7b9a459 | 144 | char *dname = clp->cl_recdir; |
e970a573 | 145 | struct dentry *dir, *dentry; |
0ce0c2b5 | 146 | struct nfs4_client_reclaim *crp; |
c7b9a459 N |
147 | int status; |
148 | ||
149 | dprintk("NFSD: nfsd4_create_clid_dir for \"%s\"\n", dname); | |
150 | ||
a52d726b | 151 | if (test_and_set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) |
7a6ef8c7 | 152 | return; |
b8548894 | 153 | if (!rec_file) |
7a6ef8c7 | 154 | return; |
d84f4f99 DH |
155 | status = nfs4_save_creds(&original_cred); |
156 | if (status < 0) | |
7a6ef8c7 | 157 | return; |
c7b9a459 | 158 | |
4a55c101 JK |
159 | status = mnt_want_write_file(rec_file); |
160 | if (status) | |
161 | return; | |
162 | ||
e970a573 | 163 | dir = rec_file->f_path.dentry; |
c7b9a459 | 164 | /* lock the parent */ |
e970a573 | 165 | mutex_lock(&dir->d_inode->i_mutex); |
c7b9a459 | 166 | |
e970a573 | 167 | dentry = lookup_one_len(dname, dir, HEXDIR_LEN-1); |
c7b9a459 N |
168 | if (IS_ERR(dentry)) { |
169 | status = PTR_ERR(dentry); | |
170 | goto out_unlock; | |
171 | } | |
6577aac0 | 172 | if (dentry->d_inode) |
aec39680 BF |
173 | /* |
174 | * In the 4.1 case, where we're called from | |
175 | * reclaim_complete(), records from the previous reboot | |
176 | * may still be left, so this is OK. | |
177 | * | |
178 | * In the 4.0 case, we should never get here; but we may | |
179 | * as well be forgiving and just succeed silently. | |
180 | */ | |
c7b9a459 | 181 | goto out_put; |
e970a573 | 182 | status = vfs_mkdir(dir->d_inode, dentry, S_IRWXU); |
c7b9a459 N |
183 | out_put: |
184 | dput(dentry); | |
185 | out_unlock: | |
e970a573 | 186 | mutex_unlock(&dir->d_inode->i_mutex); |
0ce0c2b5 JL |
187 | if (status == 0) { |
188 | if (in_grace) { | |
189 | crp = nfs4_client_to_reclaim(clp->cl_recdir); | |
190 | if (crp) | |
191 | crp->cr_clp = clp; | |
192 | } | |
8018ab05 | 193 | vfs_fsync(rec_file, 0); |
0ce0c2b5 | 194 | } else { |
6577aac0 BH |
195 | printk(KERN_ERR "NFSD: failed to write recovery record" |
196 | " (err %d); please check that %s exists" | |
197 | " and is writeable", status, | |
198 | user_recovery_dirname); | |
0ce0c2b5 | 199 | } |
4a55c101 | 200 | mnt_drop_write_file(rec_file); |
d84f4f99 | 201 | nfs4_reset_creds(original_cred); |
c7b9a459 N |
202 | } |
203 | ||
190e4fbf N |
204 | typedef int (recdir_func)(struct dentry *, struct dentry *); |
205 | ||
05f4f678 BF |
206 | struct name_list { |
207 | char name[HEXDIR_LEN]; | |
190e4fbf N |
208 | struct list_head list; |
209 | }; | |
210 | ||
190e4fbf | 211 | static int |
05f4f678 | 212 | nfsd4_build_namelist(void *arg, const char *name, int namlen, |
afefdbb2 | 213 | loff_t offset, u64 ino, unsigned int d_type) |
190e4fbf | 214 | { |
05f4f678 BF |
215 | struct list_head *names = arg; |
216 | struct name_list *entry; | |
190e4fbf | 217 | |
05f4f678 | 218 | if (namlen != HEXDIR_LEN - 1) |
b37ad28b | 219 | return 0; |
05f4f678 BF |
220 | entry = kmalloc(sizeof(struct name_list), GFP_KERNEL); |
221 | if (entry == NULL) | |
190e4fbf | 222 | return -ENOMEM; |
05f4f678 BF |
223 | memcpy(entry->name, name, HEXDIR_LEN - 1); |
224 | entry->name[HEXDIR_LEN - 1] = '\0'; | |
225 | list_add(&entry->list, names); | |
190e4fbf N |
226 | return 0; |
227 | } | |
228 | ||
229 | static int | |
5b4b299c | 230 | nfsd4_list_rec_dir(recdir_func *f) |
190e4fbf | 231 | { |
d84f4f99 | 232 | const struct cred *original_cred; |
5b4b299c | 233 | struct dentry *dir = rec_file->f_path.dentry; |
05f4f678 | 234 | LIST_HEAD(names); |
190e4fbf N |
235 | int status; |
236 | ||
d84f4f99 DH |
237 | status = nfs4_save_creds(&original_cred); |
238 | if (status < 0) | |
239 | return status; | |
190e4fbf | 240 | |
5b4b299c AV |
241 | status = vfs_llseek(rec_file, 0, SEEK_SET); |
242 | if (status < 0) { | |
243 | nfs4_reset_creds(original_cred); | |
244 | return status; | |
245 | } | |
246 | ||
247 | status = vfs_readdir(rec_file, nfsd4_build_namelist, &names); | |
8daed1e5 | 248 | mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_PARENT); |
05f4f678 | 249 | while (!list_empty(&names)) { |
5b4b299c | 250 | struct name_list *entry; |
05f4f678 | 251 | entry = list_entry(names.next, struct name_list, list); |
5b4b299c AV |
252 | if (!status) { |
253 | struct dentry *dentry; | |
254 | dentry = lookup_one_len(entry->name, dir, HEXDIR_LEN-1); | |
255 | if (IS_ERR(dentry)) { | |
256 | status = PTR_ERR(dentry); | |
257 | break; | |
258 | } | |
259 | status = f(dir, dentry); | |
260 | dput(dentry); | |
05f4f678 | 261 | } |
05f4f678 BF |
262 | list_del(&entry->list); |
263 | kfree(entry); | |
190e4fbf | 264 | } |
2f9092e1 | 265 | mutex_unlock(&dir->d_inode->i_mutex); |
d84f4f99 | 266 | nfs4_reset_creds(original_cred); |
190e4fbf N |
267 | return status; |
268 | } | |
269 | ||
c7b9a459 N |
270 | static int |
271 | nfsd4_unlink_clid_dir(char *name, int namlen) | |
272 | { | |
e970a573 | 273 | struct dentry *dir, *dentry; |
c7b9a459 N |
274 | int status; |
275 | ||
276 | dprintk("NFSD: nfsd4_unlink_clid_dir. name %.*s\n", namlen, name); | |
277 | ||
e970a573 CH |
278 | dir = rec_file->f_path.dentry; |
279 | mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_PARENT); | |
280 | dentry = lookup_one_len(name, dir, namlen); | |
c7b9a459 N |
281 | if (IS_ERR(dentry)) { |
282 | status = PTR_ERR(dentry); | |
2f9092e1 | 283 | goto out_unlock; |
c7b9a459 N |
284 | } |
285 | status = -ENOENT; | |
286 | if (!dentry->d_inode) | |
287 | goto out; | |
e970a573 | 288 | status = vfs_rmdir(dir->d_inode, dentry); |
c7b9a459 N |
289 | out: |
290 | dput(dentry); | |
2f9092e1 | 291 | out_unlock: |
e970a573 | 292 | mutex_unlock(&dir->d_inode->i_mutex); |
c7b9a459 N |
293 | return status; |
294 | } | |
295 | ||
2a4317c5 | 296 | static void |
c7b9a459 N |
297 | nfsd4_remove_clid_dir(struct nfs4_client *clp) |
298 | { | |
d84f4f99 | 299 | const struct cred *original_cred; |
0ce0c2b5 | 300 | struct nfs4_client_reclaim *crp; |
c7b9a459 N |
301 | int status; |
302 | ||
a52d726b | 303 | if (!rec_file || !test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) |
c7b9a459 N |
304 | return; |
305 | ||
a561be71 | 306 | status = mnt_want_write_file(rec_file); |
0622753b DH |
307 | if (status) |
308 | goto out; | |
a52d726b | 309 | clear_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags); |
d84f4f99 DH |
310 | |
311 | status = nfs4_save_creds(&original_cred); | |
312 | if (status < 0) | |
698d8d87 | 313 | goto out_drop_write; |
d84f4f99 | 314 | |
c7b9a459 | 315 | status = nfsd4_unlink_clid_dir(clp->cl_recdir, HEXDIR_LEN-1); |
d84f4f99 | 316 | nfs4_reset_creds(original_cred); |
0ce0c2b5 | 317 | if (status == 0) { |
8018ab05 | 318 | vfs_fsync(rec_file, 0); |
0ce0c2b5 JL |
319 | if (in_grace) { |
320 | /* remove reclaim record */ | |
321 | crp = nfsd4_find_reclaim_client(clp->cl_recdir); | |
322 | if (crp) | |
323 | nfs4_remove_reclaim_record(crp); | |
324 | } | |
325 | } | |
698d8d87 | 326 | out_drop_write: |
2a79f17e | 327 | mnt_drop_write_file(rec_file); |
0622753b | 328 | out: |
c7b9a459 N |
329 | if (status) |
330 | printk("NFSD: Failed to remove expired client state directory" | |
331 | " %.*s\n", HEXDIR_LEN, clp->cl_recdir); | |
c7b9a459 N |
332 | } |
333 | ||
334 | static int | |
335 | purge_old(struct dentry *parent, struct dentry *child) | |
336 | { | |
337 | int status; | |
338 | ||
a0af710a | 339 | if (nfs4_has_reclaimed_state(child->d_name.name)) |
b37ad28b | 340 | return 0; |
c7b9a459 | 341 | |
2f9092e1 | 342 | status = vfs_rmdir(parent->d_inode, child); |
c7b9a459 N |
343 | if (status) |
344 | printk("failed to remove client recovery directory %s\n", | |
345 | child->d_name.name); | |
346 | /* Keep trying, success or failure: */ | |
b37ad28b | 347 | return 0; |
c7b9a459 N |
348 | } |
349 | ||
2a4317c5 JL |
350 | static void |
351 | nfsd4_recdir_purge_old(struct net *net, time_t boot_time) | |
352 | { | |
c7b9a459 N |
353 | int status; |
354 | ||
0ce0c2b5 | 355 | in_grace = false; |
e970a573 | 356 | if (!rec_file) |
c7b9a459 | 357 | return; |
a561be71 | 358 | status = mnt_want_write_file(rec_file); |
0622753b DH |
359 | if (status) |
360 | goto out; | |
5b4b299c | 361 | status = nfsd4_list_rec_dir(purge_old); |
c7b9a459 | 362 | if (status == 0) |
8018ab05 | 363 | vfs_fsync(rec_file, 0); |
2a79f17e | 364 | mnt_drop_write_file(rec_file); |
0622753b | 365 | out: |
c7b9a459 N |
366 | if (status) |
367 | printk("nfsd4: failed to purge old clients from recovery" | |
e970a573 | 368 | " directory %s\n", rec_file->f_path.dentry->d_name.name); |
c7b9a459 N |
369 | } |
370 | ||
190e4fbf N |
371 | static int |
372 | load_recdir(struct dentry *parent, struct dentry *child) | |
373 | { | |
374 | if (child->d_name.len != HEXDIR_LEN - 1) { | |
375 | printk("nfsd4: illegal name %s in recovery directory\n", | |
376 | child->d_name.name); | |
377 | /* Keep trying; maybe the others are OK: */ | |
b37ad28b | 378 | return 0; |
190e4fbf N |
379 | } |
380 | nfs4_client_to_reclaim(child->d_name.name); | |
b37ad28b | 381 | return 0; |
190e4fbf N |
382 | } |
383 | ||
2a4317c5 | 384 | static int |
190e4fbf N |
385 | nfsd4_recdir_load(void) { |
386 | int status; | |
387 | ||
e970a573 CH |
388 | if (!rec_file) |
389 | return 0; | |
390 | ||
5b4b299c | 391 | status = nfsd4_list_rec_dir(load_recdir); |
190e4fbf N |
392 | if (status) |
393 | printk("nfsd4: failed loading clients from recovery" | |
e970a573 | 394 | " directory %s\n", rec_file->f_path.dentry->d_name.name); |
190e4fbf N |
395 | return status; |
396 | } | |
397 | ||
398 | /* | |
399 | * Hold reference to the recovery directory. | |
400 | */ | |
401 | ||
2a4317c5 JL |
402 | static int |
403 | nfsd4_init_recdir(void) | |
190e4fbf | 404 | { |
d84f4f99 DH |
405 | const struct cred *original_cred; |
406 | int status; | |
190e4fbf N |
407 | |
408 | printk("NFSD: Using %s as the NFSv4 state recovery directory\n", | |
48483bf2 | 409 | user_recovery_dirname); |
190e4fbf | 410 | |
e970a573 | 411 | BUG_ON(rec_file); |
190e4fbf | 412 | |
d84f4f99 DH |
413 | status = nfs4_save_creds(&original_cred); |
414 | if (status < 0) { | |
415 | printk("NFSD: Unable to change credentials to find recovery" | |
416 | " directory: error %d\n", | |
417 | status); | |
2a4317c5 | 418 | return status; |
d84f4f99 | 419 | } |
190e4fbf | 420 | |
48483bf2 | 421 | rec_file = filp_open(user_recovery_dirname, O_RDONLY | O_DIRECTORY, 0); |
e970a573 | 422 | if (IS_ERR(rec_file)) { |
c2642ab0 | 423 | printk("NFSD: unable to find recovery directory %s\n", |
48483bf2 | 424 | user_recovery_dirname); |
2a4317c5 | 425 | status = PTR_ERR(rec_file); |
e970a573 CH |
426 | rec_file = NULL; |
427 | } | |
190e4fbf | 428 | |
d84f4f99 | 429 | nfs4_reset_creds(original_cred); |
0ce0c2b5 JL |
430 | if (!status) |
431 | in_grace = true; | |
2a4317c5 | 432 | return status; |
190e4fbf N |
433 | } |
434 | ||
2a4317c5 JL |
435 | static int |
436 | nfsd4_load_reboot_recovery_data(struct net *net) | |
437 | { | |
438 | int status; | |
439 | ||
cc27e0d4 JL |
440 | /* XXX: The legacy code won't work in a container */ |
441 | if (net != &init_net) { | |
442 | WARN(1, KERN_ERR "NFSD: attempt to initialize legacy client " | |
443 | "tracking in a container!\n"); | |
444 | return -EINVAL; | |
445 | } | |
446 | ||
2a4317c5 JL |
447 | nfs4_lock_state(); |
448 | status = nfsd4_init_recdir(); | |
449 | if (!status) | |
450 | status = nfsd4_recdir_load(); | |
451 | nfs4_unlock_state(); | |
452 | if (status) | |
453 | printk(KERN_ERR "NFSD: Failure reading reboot recovery data\n"); | |
454 | return status; | |
455 | } | |
456 | ||
457 | static void | |
190e4fbf N |
458 | nfsd4_shutdown_recdir(void) |
459 | { | |
e970a573 | 460 | if (!rec_file) |
190e4fbf | 461 | return; |
e970a573 CH |
462 | fput(rec_file); |
463 | rec_file = NULL; | |
190e4fbf | 464 | } |
48483bf2 | 465 | |
2a4317c5 JL |
466 | static void |
467 | nfsd4_legacy_tracking_exit(struct net *net) | |
468 | { | |
469 | nfs4_release_reclaim(); | |
470 | nfsd4_shutdown_recdir(); | |
471 | } | |
472 | ||
48483bf2 BF |
473 | /* |
474 | * Change the NFSv4 recovery directory to recdir. | |
475 | */ | |
476 | int | |
477 | nfs4_reset_recoverydir(char *recdir) | |
478 | { | |
479 | int status; | |
480 | struct path path; | |
481 | ||
482 | status = kern_path(recdir, LOOKUP_FOLLOW, &path); | |
483 | if (status) | |
484 | return status; | |
485 | status = -ENOTDIR; | |
486 | if (S_ISDIR(path.dentry->d_inode->i_mode)) { | |
487 | strcpy(user_recovery_dirname, recdir); | |
488 | status = 0; | |
489 | } | |
490 | path_put(&path); | |
491 | return status; | |
492 | } | |
493 | ||
494 | char * | |
495 | nfs4_recoverydir(void) | |
496 | { | |
497 | return user_recovery_dirname; | |
498 | } | |
2a4317c5 JL |
499 | |
500 | static int | |
501 | nfsd4_check_legacy_client(struct nfs4_client *clp) | |
502 | { | |
0ce0c2b5 JL |
503 | struct nfs4_client_reclaim *crp; |
504 | ||
2a4317c5 JL |
505 | /* did we already find that this client is stable? */ |
506 | if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) | |
507 | return 0; | |
508 | ||
509 | /* look for it in the reclaim hashtable otherwise */ | |
0ce0c2b5 JL |
510 | crp = nfsd4_find_reclaim_client(clp->cl_recdir); |
511 | if (crp) { | |
2a4317c5 | 512 | set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags); |
0ce0c2b5 | 513 | crp->cr_clp = clp; |
2a4317c5 JL |
514 | return 0; |
515 | } | |
516 | ||
517 | return -ENOENT; | |
518 | } | |
519 | ||
520 | static struct nfsd4_client_tracking_ops nfsd4_legacy_tracking_ops = { | |
521 | .init = nfsd4_load_reboot_recovery_data, | |
522 | .exit = nfsd4_legacy_tracking_exit, | |
523 | .create = nfsd4_create_clid_dir, | |
524 | .remove = nfsd4_remove_clid_dir, | |
525 | .check = nfsd4_check_legacy_client, | |
526 | .grace_done = nfsd4_recdir_purge_old, | |
527 | }; | |
528 | ||
f3f80148 JL |
529 | /* Globals */ |
530 | #define NFSD_PIPE_DIR "nfsd" | |
531 | #define NFSD_CLD_PIPE "cld" | |
532 | ||
533 | /* per-net-ns structure for holding cld upcall info */ | |
534 | struct cld_net { | |
535 | struct rpc_pipe *cn_pipe; | |
536 | spinlock_t cn_lock; | |
537 | struct list_head cn_list; | |
538 | unsigned int cn_xid; | |
539 | }; | |
540 | ||
541 | struct cld_upcall { | |
542 | struct list_head cu_list; | |
543 | struct cld_net *cu_net; | |
544 | struct task_struct *cu_task; | |
545 | struct cld_msg cu_msg; | |
546 | }; | |
547 | ||
548 | static int | |
549 | __cld_pipe_upcall(struct rpc_pipe *pipe, struct cld_msg *cmsg) | |
550 | { | |
551 | int ret; | |
552 | struct rpc_pipe_msg msg; | |
553 | ||
554 | memset(&msg, 0, sizeof(msg)); | |
555 | msg.data = cmsg; | |
556 | msg.len = sizeof(*cmsg); | |
557 | ||
558 | /* | |
559 | * Set task state before we queue the upcall. That prevents | |
560 | * wake_up_process in the downcall from racing with schedule. | |
561 | */ | |
562 | set_current_state(TASK_UNINTERRUPTIBLE); | |
563 | ret = rpc_queue_upcall(pipe, &msg); | |
564 | if (ret < 0) { | |
565 | set_current_state(TASK_RUNNING); | |
566 | goto out; | |
567 | } | |
568 | ||
569 | schedule(); | |
570 | set_current_state(TASK_RUNNING); | |
571 | ||
572 | if (msg.errno < 0) | |
573 | ret = msg.errno; | |
574 | out: | |
575 | return ret; | |
576 | } | |
577 | ||
578 | static int | |
579 | cld_pipe_upcall(struct rpc_pipe *pipe, struct cld_msg *cmsg) | |
580 | { | |
581 | int ret; | |
582 | ||
583 | /* | |
584 | * -EAGAIN occurs when pipe is closed and reopened while there are | |
585 | * upcalls queued. | |
586 | */ | |
587 | do { | |
588 | ret = __cld_pipe_upcall(pipe, cmsg); | |
589 | } while (ret == -EAGAIN); | |
590 | ||
591 | return ret; | |
592 | } | |
593 | ||
594 | static ssize_t | |
595 | cld_pipe_downcall(struct file *filp, const char __user *src, size_t mlen) | |
596 | { | |
597 | struct cld_upcall *tmp, *cup; | |
bc1b542b | 598 | struct cld_msg __user *cmsg = (struct cld_msg __user *)src; |
f3f80148 JL |
599 | uint32_t xid; |
600 | struct nfsd_net *nn = net_generic(filp->f_dentry->d_sb->s_fs_info, | |
601 | nfsd_net_id); | |
602 | struct cld_net *cn = nn->cld_net; | |
603 | ||
604 | if (mlen != sizeof(*cmsg)) { | |
8a7dc4b0 | 605 | dprintk("%s: got %zu bytes, expected %zu\n", __func__, mlen, |
f3f80148 JL |
606 | sizeof(*cmsg)); |
607 | return -EINVAL; | |
608 | } | |
609 | ||
610 | /* copy just the xid so we can try to find that */ | |
611 | if (copy_from_user(&xid, &cmsg->cm_xid, sizeof(xid)) != 0) { | |
612 | dprintk("%s: error when copying xid from userspace", __func__); | |
613 | return -EFAULT; | |
614 | } | |
615 | ||
616 | /* walk the list and find corresponding xid */ | |
617 | cup = NULL; | |
618 | spin_lock(&cn->cn_lock); | |
619 | list_for_each_entry(tmp, &cn->cn_list, cu_list) { | |
620 | if (get_unaligned(&tmp->cu_msg.cm_xid) == xid) { | |
621 | cup = tmp; | |
622 | list_del_init(&cup->cu_list); | |
623 | break; | |
624 | } | |
625 | } | |
626 | spin_unlock(&cn->cn_lock); | |
627 | ||
628 | /* couldn't find upcall? */ | |
629 | if (!cup) { | |
21f72c9f | 630 | dprintk("%s: couldn't find upcall -- xid=%u\n", __func__, xid); |
f3f80148 JL |
631 | return -EINVAL; |
632 | } | |
633 | ||
634 | if (copy_from_user(&cup->cu_msg, src, mlen) != 0) | |
635 | return -EFAULT; | |
636 | ||
637 | wake_up_process(cup->cu_task); | |
638 | return mlen; | |
639 | } | |
640 | ||
641 | static void | |
642 | cld_pipe_destroy_msg(struct rpc_pipe_msg *msg) | |
643 | { | |
644 | struct cld_msg *cmsg = msg->data; | |
645 | struct cld_upcall *cup = container_of(cmsg, struct cld_upcall, | |
646 | cu_msg); | |
647 | ||
648 | /* errno >= 0 means we got a downcall */ | |
649 | if (msg->errno >= 0) | |
650 | return; | |
651 | ||
652 | wake_up_process(cup->cu_task); | |
653 | } | |
654 | ||
655 | static const struct rpc_pipe_ops cld_upcall_ops = { | |
656 | .upcall = rpc_pipe_generic_upcall, | |
657 | .downcall = cld_pipe_downcall, | |
658 | .destroy_msg = cld_pipe_destroy_msg, | |
659 | }; | |
660 | ||
661 | static struct dentry * | |
662 | nfsd4_cld_register_sb(struct super_block *sb, struct rpc_pipe *pipe) | |
663 | { | |
664 | struct dentry *dir, *dentry; | |
665 | ||
666 | dir = rpc_d_lookup_sb(sb, NFSD_PIPE_DIR); | |
667 | if (dir == NULL) | |
668 | return ERR_PTR(-ENOENT); | |
669 | dentry = rpc_mkpipe_dentry(dir, NFSD_CLD_PIPE, NULL, pipe); | |
670 | dput(dir); | |
671 | return dentry; | |
672 | } | |
673 | ||
674 | static void | |
675 | nfsd4_cld_unregister_sb(struct rpc_pipe *pipe) | |
676 | { | |
677 | if (pipe->dentry) | |
678 | rpc_unlink(pipe->dentry); | |
679 | } | |
680 | ||
681 | static struct dentry * | |
682 | nfsd4_cld_register_net(struct net *net, struct rpc_pipe *pipe) | |
683 | { | |
684 | struct super_block *sb; | |
685 | struct dentry *dentry; | |
686 | ||
687 | sb = rpc_get_sb_net(net); | |
688 | if (!sb) | |
689 | return NULL; | |
690 | dentry = nfsd4_cld_register_sb(sb, pipe); | |
691 | rpc_put_sb_net(net); | |
692 | return dentry; | |
693 | } | |
694 | ||
695 | static void | |
696 | nfsd4_cld_unregister_net(struct net *net, struct rpc_pipe *pipe) | |
697 | { | |
698 | struct super_block *sb; | |
699 | ||
700 | sb = rpc_get_sb_net(net); | |
701 | if (sb) { | |
702 | nfsd4_cld_unregister_sb(pipe); | |
703 | rpc_put_sb_net(net); | |
704 | } | |
705 | } | |
706 | ||
707 | /* Initialize rpc_pipefs pipe for communication with client tracking daemon */ | |
708 | static int | |
709 | nfsd4_init_cld_pipe(struct net *net) | |
710 | { | |
711 | int ret; | |
712 | struct dentry *dentry; | |
713 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); | |
714 | struct cld_net *cn; | |
715 | ||
716 | if (nn->cld_net) | |
717 | return 0; | |
718 | ||
719 | cn = kzalloc(sizeof(*cn), GFP_KERNEL); | |
720 | if (!cn) { | |
721 | ret = -ENOMEM; | |
722 | goto err; | |
723 | } | |
724 | ||
725 | cn->cn_pipe = rpc_mkpipe_data(&cld_upcall_ops, RPC_PIPE_WAIT_FOR_OPEN); | |
726 | if (IS_ERR(cn->cn_pipe)) { | |
727 | ret = PTR_ERR(cn->cn_pipe); | |
728 | goto err; | |
729 | } | |
730 | spin_lock_init(&cn->cn_lock); | |
731 | INIT_LIST_HEAD(&cn->cn_list); | |
732 | ||
733 | dentry = nfsd4_cld_register_net(net, cn->cn_pipe); | |
734 | if (IS_ERR(dentry)) { | |
735 | ret = PTR_ERR(dentry); | |
736 | goto err_destroy_data; | |
737 | } | |
738 | ||
739 | cn->cn_pipe->dentry = dentry; | |
740 | nn->cld_net = cn; | |
741 | return 0; | |
742 | ||
743 | err_destroy_data: | |
744 | rpc_destroy_pipe_data(cn->cn_pipe); | |
745 | err: | |
746 | kfree(cn); | |
747 | printk(KERN_ERR "NFSD: unable to create nfsdcld upcall pipe (%d)\n", | |
748 | ret); | |
749 | return ret; | |
750 | } | |
751 | ||
752 | static void | |
753 | nfsd4_remove_cld_pipe(struct net *net) | |
754 | { | |
755 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); | |
756 | struct cld_net *cn = nn->cld_net; | |
757 | ||
758 | nfsd4_cld_unregister_net(net, cn->cn_pipe); | |
759 | rpc_destroy_pipe_data(cn->cn_pipe); | |
760 | kfree(nn->cld_net); | |
761 | nn->cld_net = NULL; | |
762 | } | |
763 | ||
764 | static struct cld_upcall * | |
765 | alloc_cld_upcall(struct cld_net *cn) | |
766 | { | |
767 | struct cld_upcall *new, *tmp; | |
768 | ||
769 | new = kzalloc(sizeof(*new), GFP_KERNEL); | |
770 | if (!new) | |
771 | return new; | |
772 | ||
773 | /* FIXME: hard cap on number in flight? */ | |
774 | restart_search: | |
775 | spin_lock(&cn->cn_lock); | |
776 | list_for_each_entry(tmp, &cn->cn_list, cu_list) { | |
777 | if (tmp->cu_msg.cm_xid == cn->cn_xid) { | |
778 | cn->cn_xid++; | |
779 | spin_unlock(&cn->cn_lock); | |
780 | goto restart_search; | |
781 | } | |
782 | } | |
783 | new->cu_task = current; | |
784 | new->cu_msg.cm_vers = CLD_UPCALL_VERSION; | |
785 | put_unaligned(cn->cn_xid++, &new->cu_msg.cm_xid); | |
786 | new->cu_net = cn; | |
787 | list_add(&new->cu_list, &cn->cn_list); | |
788 | spin_unlock(&cn->cn_lock); | |
789 | ||
790 | dprintk("%s: allocated xid %u\n", __func__, new->cu_msg.cm_xid); | |
791 | ||
792 | return new; | |
793 | } | |
794 | ||
795 | static void | |
796 | free_cld_upcall(struct cld_upcall *victim) | |
797 | { | |
798 | struct cld_net *cn = victim->cu_net; | |
799 | ||
800 | spin_lock(&cn->cn_lock); | |
801 | list_del(&victim->cu_list); | |
802 | spin_unlock(&cn->cn_lock); | |
803 | kfree(victim); | |
804 | } | |
805 | ||
806 | /* Ask daemon to create a new record */ | |
807 | static void | |
808 | nfsd4_cld_create(struct nfs4_client *clp) | |
809 | { | |
810 | int ret; | |
811 | struct cld_upcall *cup; | |
812 | /* FIXME: determine net from clp */ | |
813 | struct nfsd_net *nn = net_generic(&init_net, nfsd_net_id); | |
814 | struct cld_net *cn = nn->cld_net; | |
815 | ||
816 | /* Don't upcall if it's already stored */ | |
817 | if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) | |
818 | return; | |
819 | ||
820 | cup = alloc_cld_upcall(cn); | |
821 | if (!cup) { | |
822 | ret = -ENOMEM; | |
823 | goto out_err; | |
824 | } | |
825 | ||
826 | cup->cu_msg.cm_cmd = Cld_Create; | |
827 | cup->cu_msg.cm_u.cm_name.cn_len = clp->cl_name.len; | |
828 | memcpy(cup->cu_msg.cm_u.cm_name.cn_id, clp->cl_name.data, | |
829 | clp->cl_name.len); | |
830 | ||
831 | ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_msg); | |
832 | if (!ret) { | |
833 | ret = cup->cu_msg.cm_status; | |
834 | set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags); | |
835 | } | |
836 | ||
837 | free_cld_upcall(cup); | |
838 | out_err: | |
839 | if (ret) | |
840 | printk(KERN_ERR "NFSD: Unable to create client " | |
841 | "record on stable storage: %d\n", ret); | |
842 | } | |
843 | ||
844 | /* Ask daemon to create a new record */ | |
845 | static void | |
846 | nfsd4_cld_remove(struct nfs4_client *clp) | |
847 | { | |
848 | int ret; | |
849 | struct cld_upcall *cup; | |
850 | /* FIXME: determine net from clp */ | |
851 | struct nfsd_net *nn = net_generic(&init_net, nfsd_net_id); | |
852 | struct cld_net *cn = nn->cld_net; | |
853 | ||
854 | /* Don't upcall if it's already removed */ | |
855 | if (!test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) | |
856 | return; | |
857 | ||
858 | cup = alloc_cld_upcall(cn); | |
859 | if (!cup) { | |
860 | ret = -ENOMEM; | |
861 | goto out_err; | |
862 | } | |
863 | ||
864 | cup->cu_msg.cm_cmd = Cld_Remove; | |
865 | cup->cu_msg.cm_u.cm_name.cn_len = clp->cl_name.len; | |
866 | memcpy(cup->cu_msg.cm_u.cm_name.cn_id, clp->cl_name.data, | |
867 | clp->cl_name.len); | |
868 | ||
869 | ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_msg); | |
870 | if (!ret) { | |
871 | ret = cup->cu_msg.cm_status; | |
872 | clear_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags); | |
873 | } | |
874 | ||
875 | free_cld_upcall(cup); | |
876 | out_err: | |
877 | if (ret) | |
878 | printk(KERN_ERR "NFSD: Unable to remove client " | |
879 | "record from stable storage: %d\n", ret); | |
880 | } | |
881 | ||
882 | /* Check for presence of a record, and update its timestamp */ | |
883 | static int | |
884 | nfsd4_cld_check(struct nfs4_client *clp) | |
885 | { | |
886 | int ret; | |
887 | struct cld_upcall *cup; | |
888 | /* FIXME: determine net from clp */ | |
889 | struct nfsd_net *nn = net_generic(&init_net, nfsd_net_id); | |
890 | struct cld_net *cn = nn->cld_net; | |
891 | ||
892 | /* Don't upcall if one was already stored during this grace pd */ | |
893 | if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) | |
894 | return 0; | |
895 | ||
896 | cup = alloc_cld_upcall(cn); | |
897 | if (!cup) { | |
898 | printk(KERN_ERR "NFSD: Unable to check client record on " | |
899 | "stable storage: %d\n", -ENOMEM); | |
900 | return -ENOMEM; | |
901 | } | |
902 | ||
903 | cup->cu_msg.cm_cmd = Cld_Check; | |
904 | cup->cu_msg.cm_u.cm_name.cn_len = clp->cl_name.len; | |
905 | memcpy(cup->cu_msg.cm_u.cm_name.cn_id, clp->cl_name.data, | |
906 | clp->cl_name.len); | |
907 | ||
908 | ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_msg); | |
909 | if (!ret) { | |
910 | ret = cup->cu_msg.cm_status; | |
911 | set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags); | |
912 | } | |
913 | ||
914 | free_cld_upcall(cup); | |
915 | return ret; | |
916 | } | |
917 | ||
918 | static void | |
919 | nfsd4_cld_grace_done(struct net *net, time_t boot_time) | |
920 | { | |
921 | int ret; | |
922 | struct cld_upcall *cup; | |
923 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); | |
924 | struct cld_net *cn = nn->cld_net; | |
925 | ||
926 | cup = alloc_cld_upcall(cn); | |
927 | if (!cup) { | |
928 | ret = -ENOMEM; | |
929 | goto out_err; | |
930 | } | |
931 | ||
932 | cup->cu_msg.cm_cmd = Cld_GraceDone; | |
933 | cup->cu_msg.cm_u.cm_gracetime = (int64_t)boot_time; | |
934 | ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_msg); | |
935 | if (!ret) | |
936 | ret = cup->cu_msg.cm_status; | |
937 | ||
938 | free_cld_upcall(cup); | |
939 | out_err: | |
940 | if (ret) | |
941 | printk(KERN_ERR "NFSD: Unable to end grace period: %d\n", ret); | |
942 | } | |
943 | ||
944 | static struct nfsd4_client_tracking_ops nfsd4_cld_tracking_ops = { | |
945 | .init = nfsd4_init_cld_pipe, | |
946 | .exit = nfsd4_remove_cld_pipe, | |
947 | .create = nfsd4_cld_create, | |
948 | .remove = nfsd4_cld_remove, | |
949 | .check = nfsd4_cld_check, | |
950 | .grace_done = nfsd4_cld_grace_done, | |
951 | }; | |
952 | ||
2873d214 JL |
953 | /* upcall via usermodehelper */ |
954 | static char cltrack_prog[PATH_MAX] = "/sbin/nfsdcltrack"; | |
955 | module_param_string(cltrack_prog, cltrack_prog, sizeof(cltrack_prog), | |
956 | S_IRUGO|S_IWUSR); | |
957 | MODULE_PARM_DESC(cltrack_prog, "Path to the nfsdcltrack upcall program"); | |
958 | ||
f3aa7e24 JL |
959 | static bool cltrack_legacy_disable; |
960 | module_param(cltrack_legacy_disable, bool, S_IRUGO|S_IWUSR); | |
961 | MODULE_PARM_DESC(cltrack_legacy_disable, | |
962 | "Disable legacy recoverydir conversion. Default: false"); | |
963 | ||
964 | #define LEGACY_TOPDIR_ENV_PREFIX "NFSDCLTRACK_LEGACY_TOPDIR=" | |
965 | #define LEGACY_RECDIR_ENV_PREFIX "NFSDCLTRACK_LEGACY_RECDIR=" | |
966 | ||
967 | static char * | |
968 | nfsd4_cltrack_legacy_topdir(void) | |
969 | { | |
970 | int copied; | |
971 | size_t len; | |
972 | char *result; | |
973 | ||
974 | if (cltrack_legacy_disable) | |
975 | return NULL; | |
976 | ||
977 | len = strlen(LEGACY_TOPDIR_ENV_PREFIX) + | |
978 | strlen(nfs4_recoverydir()) + 1; | |
979 | ||
980 | result = kmalloc(len, GFP_KERNEL); | |
981 | if (!result) | |
982 | return result; | |
983 | ||
984 | copied = snprintf(result, len, LEGACY_TOPDIR_ENV_PREFIX "%s", | |
985 | nfs4_recoverydir()); | |
986 | if (copied >= len) { | |
987 | /* just return nothing if output was truncated */ | |
988 | kfree(result); | |
989 | return NULL; | |
990 | } | |
991 | ||
992 | return result; | |
993 | } | |
994 | ||
995 | static char * | |
996 | nfsd4_cltrack_legacy_recdir(const char *recdir) | |
997 | { | |
998 | int copied; | |
999 | size_t len; | |
1000 | char *result; | |
1001 | ||
1002 | if (cltrack_legacy_disable) | |
1003 | return NULL; | |
1004 | ||
1005 | /* +1 is for '/' between "topdir" and "recdir" */ | |
1006 | len = strlen(LEGACY_RECDIR_ENV_PREFIX) + | |
1007 | strlen(nfs4_recoverydir()) + 1 + HEXDIR_LEN; | |
1008 | ||
1009 | result = kmalloc(len, GFP_KERNEL); | |
1010 | if (!result) | |
1011 | return result; | |
1012 | ||
1013 | copied = snprintf(result, len, LEGACY_RECDIR_ENV_PREFIX "%s/%s", | |
1014 | nfs4_recoverydir(), recdir); | |
1015 | if (copied >= len) { | |
1016 | /* just return nothing if output was truncated */ | |
1017 | kfree(result); | |
1018 | return NULL; | |
1019 | } | |
1020 | ||
1021 | return result; | |
1022 | } | |
1023 | ||
2873d214 | 1024 | static int |
f3aa7e24 | 1025 | nfsd4_umh_cltrack_upcall(char *cmd, char *arg, char *legacy) |
2873d214 | 1026 | { |
f3aa7e24 | 1027 | char *envp[2]; |
2873d214 JL |
1028 | char *argv[4]; |
1029 | int ret; | |
1030 | ||
1031 | if (unlikely(!cltrack_prog[0])) { | |
1032 | dprintk("%s: cltrack_prog is disabled\n", __func__); | |
1033 | return -EACCES; | |
1034 | } | |
1035 | ||
1036 | dprintk("%s: cmd: %s\n", __func__, cmd); | |
1037 | dprintk("%s: arg: %s\n", __func__, arg ? arg : "(null)"); | |
f3aa7e24 JL |
1038 | dprintk("%s: legacy: %s\n", __func__, legacy ? legacy : "(null)"); |
1039 | ||
1040 | envp[0] = legacy; | |
1041 | envp[1] = NULL; | |
2873d214 JL |
1042 | |
1043 | argv[0] = (char *)cltrack_prog; | |
1044 | argv[1] = cmd; | |
1045 | argv[2] = arg; | |
1046 | argv[3] = NULL; | |
1047 | ||
1048 | ret = call_usermodehelper(argv[0], argv, envp, UMH_WAIT_PROC); | |
1049 | /* | |
1050 | * Disable the upcall mechanism if we're getting an ENOENT or EACCES | |
1051 | * error. The admin can re-enable it on the fly by using sysfs | |
1052 | * once the problem has been fixed. | |
1053 | */ | |
1054 | if (ret == -ENOENT || ret == -EACCES) { | |
1055 | dprintk("NFSD: %s was not found or isn't executable (%d). " | |
1056 | "Setting cltrack_prog to blank string!", | |
1057 | cltrack_prog, ret); | |
1058 | cltrack_prog[0] = '\0'; | |
1059 | } | |
1060 | dprintk("%s: %s return value: %d\n", __func__, cltrack_prog, ret); | |
1061 | ||
1062 | return ret; | |
1063 | } | |
1064 | ||
1065 | static char * | |
1066 | bin_to_hex_dup(const unsigned char *src, int srclen) | |
1067 | { | |
1068 | int i; | |
1069 | char *buf, *hex; | |
1070 | ||
1071 | /* +1 for terminating NULL */ | |
1072 | buf = kmalloc((srclen * 2) + 1, GFP_KERNEL); | |
1073 | if (!buf) | |
1074 | return buf; | |
1075 | ||
1076 | hex = buf; | |
1077 | for (i = 0; i < srclen; i++) { | |
1078 | sprintf(hex, "%2.2x", *src++); | |
1079 | hex += 2; | |
1080 | } | |
1081 | return buf; | |
1082 | } | |
1083 | ||
1084 | static int | |
1085 | nfsd4_umh_cltrack_init(struct net __attribute__((unused)) *net) | |
1086 | { | |
f3aa7e24 | 1087 | return nfsd4_umh_cltrack_upcall("init", NULL, NULL); |
2873d214 JL |
1088 | } |
1089 | ||
1090 | static void | |
1091 | nfsd4_umh_cltrack_create(struct nfs4_client *clp) | |
1092 | { | |
1093 | char *hexid; | |
1094 | ||
1095 | hexid = bin_to_hex_dup(clp->cl_name.data, clp->cl_name.len); | |
1096 | if (!hexid) { | |
1097 | dprintk("%s: can't allocate memory for upcall!\n", __func__); | |
1098 | return; | |
1099 | } | |
f3aa7e24 | 1100 | nfsd4_umh_cltrack_upcall("create", hexid, NULL); |
2873d214 JL |
1101 | kfree(hexid); |
1102 | } | |
1103 | ||
1104 | static void | |
1105 | nfsd4_umh_cltrack_remove(struct nfs4_client *clp) | |
1106 | { | |
1107 | char *hexid; | |
1108 | ||
1109 | hexid = bin_to_hex_dup(clp->cl_name.data, clp->cl_name.len); | |
1110 | if (!hexid) { | |
1111 | dprintk("%s: can't allocate memory for upcall!\n", __func__); | |
1112 | return; | |
1113 | } | |
f3aa7e24 | 1114 | nfsd4_umh_cltrack_upcall("remove", hexid, NULL); |
2873d214 JL |
1115 | kfree(hexid); |
1116 | } | |
1117 | ||
1118 | static int | |
1119 | nfsd4_umh_cltrack_check(struct nfs4_client *clp) | |
1120 | { | |
1121 | int ret; | |
f3aa7e24 | 1122 | char *hexid, *legacy; |
2873d214 JL |
1123 | |
1124 | hexid = bin_to_hex_dup(clp->cl_name.data, clp->cl_name.len); | |
1125 | if (!hexid) { | |
1126 | dprintk("%s: can't allocate memory for upcall!\n", __func__); | |
1127 | return -ENOMEM; | |
1128 | } | |
f3aa7e24 JL |
1129 | legacy = nfsd4_cltrack_legacy_recdir(clp->cl_recdir); |
1130 | ret = nfsd4_umh_cltrack_upcall("check", hexid, legacy); | |
1131 | kfree(legacy); | |
2873d214 JL |
1132 | kfree(hexid); |
1133 | return ret; | |
1134 | } | |
1135 | ||
1136 | static void | |
1137 | nfsd4_umh_cltrack_grace_done(struct net __attribute__((unused)) *net, | |
1138 | time_t boot_time) | |
1139 | { | |
f3aa7e24 | 1140 | char *legacy; |
2873d214 JL |
1141 | char timestr[22]; /* FIXME: better way to determine max size? */ |
1142 | ||
1143 | sprintf(timestr, "%ld", boot_time); | |
f3aa7e24 JL |
1144 | legacy = nfsd4_cltrack_legacy_topdir(); |
1145 | nfsd4_umh_cltrack_upcall("gracedone", timestr, legacy); | |
1146 | kfree(legacy); | |
2873d214 JL |
1147 | } |
1148 | ||
1149 | static struct nfsd4_client_tracking_ops nfsd4_umh_tracking_ops = { | |
1150 | .init = nfsd4_umh_cltrack_init, | |
1151 | .exit = NULL, | |
1152 | .create = nfsd4_umh_cltrack_create, | |
1153 | .remove = nfsd4_umh_cltrack_remove, | |
1154 | .check = nfsd4_umh_cltrack_check, | |
1155 | .grace_done = nfsd4_umh_cltrack_grace_done, | |
1156 | }; | |
1157 | ||
2a4317c5 JL |
1158 | int |
1159 | nfsd4_client_tracking_init(struct net *net) | |
1160 | { | |
1161 | int status; | |
f3f80148 | 1162 | struct path path; |
2a4317c5 | 1163 | |
2d77bf0a JL |
1164 | /* just run the init if it the method is already decided */ |
1165 | if (client_tracking_ops) | |
1166 | goto do_init; | |
1167 | ||
1168 | /* | |
1169 | * First, try a UMH upcall. It should succeed or fail quickly, so | |
1170 | * there's little harm in trying that first. | |
1171 | */ | |
1172 | client_tracking_ops = &nfsd4_umh_tracking_ops; | |
1173 | status = client_tracking_ops->init(net); | |
1174 | if (!status) | |
1175 | return status; | |
1176 | ||
1177 | /* | |
1178 | * See if the recoverydir exists and is a directory. If it is, | |
1179 | * then use the legacy ops. | |
1180 | */ | |
1181 | client_tracking_ops = &nfsd4_legacy_tracking_ops; | |
1182 | status = kern_path(nfs4_recoverydir(), LOOKUP_FOLLOW, &path); | |
1183 | if (!status) { | |
1184 | status = S_ISDIR(path.dentry->d_inode->i_mode); | |
1185 | path_put(&path); | |
1186 | if (status) | |
1187 | goto do_init; | |
f3f80148 | 1188 | } |
2a4317c5 | 1189 | |
2d77bf0a JL |
1190 | /* Finally, try to use nfsdcld */ |
1191 | client_tracking_ops = &nfsd4_cld_tracking_ops; | |
8b0554e9 JL |
1192 | printk(KERN_WARNING "NFSD: the nfsdcld client tracking upcall will be " |
1193 | "removed in 3.10. Please transition to using " | |
1194 | "nfsdcltrack.\n"); | |
2d77bf0a | 1195 | do_init: |
2a4317c5 JL |
1196 | status = client_tracking_ops->init(net); |
1197 | if (status) { | |
1198 | printk(KERN_WARNING "NFSD: Unable to initialize client " | |
1199 | "recovery tracking! (%d)\n", status); | |
1200 | client_tracking_ops = NULL; | |
1201 | } | |
1202 | return status; | |
1203 | } | |
1204 | ||
1205 | void | |
1206 | nfsd4_client_tracking_exit(struct net *net) | |
1207 | { | |
1208 | if (client_tracking_ops) { | |
2873d214 JL |
1209 | if (client_tracking_ops->exit) |
1210 | client_tracking_ops->exit(net); | |
2a4317c5 JL |
1211 | client_tracking_ops = NULL; |
1212 | } | |
1213 | } | |
1214 | ||
1215 | void | |
1216 | nfsd4_client_record_create(struct nfs4_client *clp) | |
1217 | { | |
1218 | if (client_tracking_ops) | |
1219 | client_tracking_ops->create(clp); | |
1220 | } | |
1221 | ||
1222 | void | |
1223 | nfsd4_client_record_remove(struct nfs4_client *clp) | |
1224 | { | |
1225 | if (client_tracking_ops) | |
1226 | client_tracking_ops->remove(clp); | |
1227 | } | |
1228 | ||
1229 | int | |
1230 | nfsd4_client_record_check(struct nfs4_client *clp) | |
1231 | { | |
1232 | if (client_tracking_ops) | |
1233 | return client_tracking_ops->check(clp); | |
1234 | ||
1235 | return -EOPNOTSUPP; | |
1236 | } | |
1237 | ||
1238 | void | |
1239 | nfsd4_record_grace_done(struct net *net, time_t boot_time) | |
1240 | { | |
1241 | if (client_tracking_ops) | |
1242 | client_tracking_ops->grace_done(net, boot_time); | |
1243 | } | |
813fd320 JL |
1244 | |
1245 | static int | |
1246 | rpc_pipefs_event(struct notifier_block *nb, unsigned long event, void *ptr) | |
1247 | { | |
1248 | struct super_block *sb = ptr; | |
1249 | struct net *net = sb->s_fs_info; | |
1250 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); | |
1251 | struct cld_net *cn = nn->cld_net; | |
1252 | struct dentry *dentry; | |
1253 | int ret = 0; | |
1254 | ||
1255 | if (!try_module_get(THIS_MODULE)) | |
1256 | return 0; | |
1257 | ||
1258 | if (!cn) { | |
1259 | module_put(THIS_MODULE); | |
1260 | return 0; | |
1261 | } | |
1262 | ||
1263 | switch (event) { | |
1264 | case RPC_PIPEFS_MOUNT: | |
1265 | dentry = nfsd4_cld_register_sb(sb, cn->cn_pipe); | |
1266 | if (IS_ERR(dentry)) { | |
1267 | ret = PTR_ERR(dentry); | |
1268 | break; | |
1269 | } | |
1270 | cn->cn_pipe->dentry = dentry; | |
1271 | break; | |
1272 | case RPC_PIPEFS_UMOUNT: | |
1273 | if (cn->cn_pipe->dentry) | |
1274 | nfsd4_cld_unregister_sb(cn->cn_pipe); | |
1275 | break; | |
1276 | default: | |
1277 | ret = -ENOTSUPP; | |
1278 | break; | |
1279 | } | |
1280 | module_put(THIS_MODULE); | |
1281 | return ret; | |
1282 | } | |
1283 | ||
2355c596 | 1284 | static struct notifier_block nfsd4_cld_block = { |
813fd320 JL |
1285 | .notifier_call = rpc_pipefs_event, |
1286 | }; | |
797a9d79 JL |
1287 | |
1288 | int | |
1289 | register_cld_notifier(void) | |
1290 | { | |
1291 | return rpc_pipefs_notifier_register(&nfsd4_cld_block); | |
1292 | } | |
1293 | ||
1294 | void | |
1295 | unregister_cld_notifier(void) | |
1296 | { | |
1297 | rpc_pipefs_notifier_unregister(&nfsd4_cld_block); | |
1298 | } |