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