]>
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 | 175 | |
a52d726b | 176 | if (test_and_set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) |
7a6ef8c7 | 177 | return; |
3a073369 | 178 | if (!nn->rec_file) |
7a6ef8c7 | 179 | return; |
2216d449 JL |
180 | |
181 | status = nfs4_make_rec_clidname(dname, &clp->cl_name); | |
182 | if (status) | |
7255e716 | 183 | return legacy_recdir_name_error(clp, status); |
2216d449 | 184 | |
d84f4f99 DH |
185 | status = nfs4_save_creds(&original_cred); |
186 | if (status < 0) | |
7a6ef8c7 | 187 | return; |
c7b9a459 | 188 | |
3a073369 | 189 | status = mnt_want_write_file(nn->rec_file); |
4a55c101 JK |
190 | if (status) |
191 | return; | |
192 | ||
3a073369 | 193 | dir = nn->rec_file->f_path.dentry; |
c7b9a459 | 194 | /* lock the parent */ |
e970a573 | 195 | mutex_lock(&dir->d_inode->i_mutex); |
c7b9a459 | 196 | |
e970a573 | 197 | dentry = lookup_one_len(dname, dir, HEXDIR_LEN-1); |
c7b9a459 N |
198 | if (IS_ERR(dentry)) { |
199 | status = PTR_ERR(dentry); | |
200 | goto out_unlock; | |
201 | } | |
6577aac0 | 202 | if (dentry->d_inode) |
aec39680 BF |
203 | /* |
204 | * In the 4.1 case, where we're called from | |
205 | * reclaim_complete(), records from the previous reboot | |
206 | * may still be left, so this is OK. | |
207 | * | |
208 | * In the 4.0 case, we should never get here; but we may | |
209 | * as well be forgiving and just succeed silently. | |
210 | */ | |
c7b9a459 | 211 | goto out_put; |
e970a573 | 212 | status = vfs_mkdir(dir->d_inode, dentry, S_IRWXU); |
c7b9a459 N |
213 | out_put: |
214 | dput(dentry); | |
215 | out_unlock: | |
e970a573 | 216 | mutex_unlock(&dir->d_inode->i_mutex); |
0ce0c2b5 | 217 | if (status == 0) { |
f141f79d | 218 | if (nn->in_grace) { |
52e19c09 | 219 | crp = nfs4_client_to_reclaim(dname, nn); |
0ce0c2b5 JL |
220 | if (crp) |
221 | crp->cr_clp = clp; | |
222 | } | |
3a073369 | 223 | vfs_fsync(nn->rec_file, 0); |
0ce0c2b5 | 224 | } else { |
6577aac0 BH |
225 | printk(KERN_ERR "NFSD: failed to write recovery record" |
226 | " (err %d); please check that %s exists" | |
227 | " and is writeable", status, | |
228 | user_recovery_dirname); | |
0ce0c2b5 | 229 | } |
3a073369 | 230 | mnt_drop_write_file(nn->rec_file); |
d84f4f99 | 231 | nfs4_reset_creds(original_cred); |
c7b9a459 N |
232 | } |
233 | ||
52e19c09 | 234 | typedef int (recdir_func)(struct dentry *, struct dentry *, struct nfsd_net *); |
190e4fbf | 235 | |
05f4f678 BF |
236 | struct name_list { |
237 | char name[HEXDIR_LEN]; | |
190e4fbf N |
238 | struct list_head list; |
239 | }; | |
240 | ||
bb6f619b AV |
241 | struct nfs4_dir_ctx { |
242 | struct dir_context ctx; | |
243 | struct list_head names; | |
244 | }; | |
245 | ||
190e4fbf | 246 | static int |
05f4f678 | 247 | nfsd4_build_namelist(void *arg, const char *name, int namlen, |
afefdbb2 | 248 | loff_t offset, u64 ino, unsigned int d_type) |
190e4fbf | 249 | { |
bb6f619b | 250 | struct nfs4_dir_ctx *ctx = arg; |
05f4f678 | 251 | struct name_list *entry; |
190e4fbf | 252 | |
05f4f678 | 253 | if (namlen != HEXDIR_LEN - 1) |
b37ad28b | 254 | return 0; |
05f4f678 BF |
255 | entry = kmalloc(sizeof(struct name_list), GFP_KERNEL); |
256 | if (entry == NULL) | |
190e4fbf | 257 | return -ENOMEM; |
05f4f678 BF |
258 | memcpy(entry->name, name, HEXDIR_LEN - 1); |
259 | entry->name[HEXDIR_LEN - 1] = '\0'; | |
bb6f619b | 260 | list_add(&entry->list, &ctx->names); |
190e4fbf N |
261 | return 0; |
262 | } | |
263 | ||
264 | static int | |
52e19c09 | 265 | nfsd4_list_rec_dir(recdir_func *f, struct nfsd_net *nn) |
190e4fbf | 266 | { |
d84f4f99 | 267 | const struct cred *original_cred; |
3a073369 | 268 | struct dentry *dir = nn->rec_file->f_path.dentry; |
ac6614b7 AV |
269 | struct nfs4_dir_ctx ctx = { |
270 | .ctx.actor = nfsd4_build_namelist, | |
271 | .names = LIST_HEAD_INIT(ctx.names) | |
272 | }; | |
190e4fbf N |
273 | int status; |
274 | ||
d84f4f99 DH |
275 | status = nfs4_save_creds(&original_cred); |
276 | if (status < 0) | |
277 | return status; | |
190e4fbf | 278 | |
3a073369 | 279 | status = vfs_llseek(nn->rec_file, 0, SEEK_SET); |
5b4b299c AV |
280 | if (status < 0) { |
281 | nfs4_reset_creds(original_cred); | |
282 | return status; | |
283 | } | |
284 | ||
5c0ba4e0 | 285 | status = iterate_dir(nn->rec_file, &ctx.ctx); |
8daed1e5 | 286 | mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_PARENT); |
5c0ba4e0 | 287 | while (!list_empty(&ctx.names)) { |
5b4b299c | 288 | struct name_list *entry; |
5c0ba4e0 | 289 | entry = list_entry(ctx.names.next, struct name_list, list); |
5b4b299c AV |
290 | if (!status) { |
291 | struct dentry *dentry; | |
292 | dentry = lookup_one_len(entry->name, dir, HEXDIR_LEN-1); | |
293 | if (IS_ERR(dentry)) { | |
294 | status = PTR_ERR(dentry); | |
295 | break; | |
296 | } | |
52e19c09 | 297 | status = f(dir, dentry, nn); |
5b4b299c | 298 | dput(dentry); |
05f4f678 | 299 | } |
05f4f678 BF |
300 | list_del(&entry->list); |
301 | kfree(entry); | |
190e4fbf | 302 | } |
2f9092e1 | 303 | mutex_unlock(&dir->d_inode->i_mutex); |
d84f4f99 | 304 | nfs4_reset_creds(original_cred); |
190e4fbf N |
305 | return status; |
306 | } | |
307 | ||
c7b9a459 | 308 | static int |
3a073369 | 309 | nfsd4_unlink_clid_dir(char *name, int namlen, struct nfsd_net *nn) |
c7b9a459 | 310 | { |
e970a573 | 311 | struct dentry *dir, *dentry; |
c7b9a459 N |
312 | int status; |
313 | ||
314 | dprintk("NFSD: nfsd4_unlink_clid_dir. name %.*s\n", namlen, name); | |
315 | ||
3a073369 | 316 | dir = nn->rec_file->f_path.dentry; |
e970a573 CH |
317 | mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_PARENT); |
318 | dentry = lookup_one_len(name, dir, namlen); | |
c7b9a459 N |
319 | if (IS_ERR(dentry)) { |
320 | status = PTR_ERR(dentry); | |
2f9092e1 | 321 | goto out_unlock; |
c7b9a459 N |
322 | } |
323 | status = -ENOENT; | |
324 | if (!dentry->d_inode) | |
325 | goto out; | |
e970a573 | 326 | status = vfs_rmdir(dir->d_inode, dentry); |
c7b9a459 N |
327 | out: |
328 | dput(dentry); | |
2f9092e1 | 329 | out_unlock: |
e970a573 | 330 | mutex_unlock(&dir->d_inode->i_mutex); |
c7b9a459 N |
331 | return status; |
332 | } | |
333 | ||
2a4317c5 | 334 | static void |
c7b9a459 N |
335 | nfsd4_remove_clid_dir(struct nfs4_client *clp) |
336 | { | |
d84f4f99 | 337 | const struct cred *original_cred; |
0ce0c2b5 | 338 | struct nfs4_client_reclaim *crp; |
2216d449 | 339 | char dname[HEXDIR_LEN]; |
c7b9a459 | 340 | int status; |
52e19c09 | 341 | struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); |
c7b9a459 | 342 | |
3a073369 | 343 | if (!nn->rec_file || !test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) |
c7b9a459 N |
344 | return; |
345 | ||
2216d449 JL |
346 | status = nfs4_make_rec_clidname(dname, &clp->cl_name); |
347 | if (status) | |
7255e716 | 348 | return legacy_recdir_name_error(clp, status); |
2216d449 | 349 | |
3a073369 | 350 | status = mnt_want_write_file(nn->rec_file); |
0622753b DH |
351 | if (status) |
352 | goto out; | |
a52d726b | 353 | clear_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags); |
d84f4f99 DH |
354 | |
355 | status = nfs4_save_creds(&original_cred); | |
356 | if (status < 0) | |
698d8d87 | 357 | goto out_drop_write; |
d84f4f99 | 358 | |
3a073369 | 359 | status = nfsd4_unlink_clid_dir(dname, HEXDIR_LEN-1, nn); |
d84f4f99 | 360 | nfs4_reset_creds(original_cred); |
0ce0c2b5 | 361 | if (status == 0) { |
3a073369 | 362 | vfs_fsync(nn->rec_file, 0); |
f141f79d | 363 | if (nn->in_grace) { |
0ce0c2b5 | 364 | /* remove reclaim record */ |
52e19c09 | 365 | crp = nfsd4_find_reclaim_client(dname, nn); |
0ce0c2b5 | 366 | if (crp) |
52e19c09 | 367 | nfs4_remove_reclaim_record(crp, nn); |
0ce0c2b5 JL |
368 | } |
369 | } | |
698d8d87 | 370 | out_drop_write: |
3a073369 | 371 | mnt_drop_write_file(nn->rec_file); |
0622753b | 372 | out: |
c7b9a459 N |
373 | if (status) |
374 | printk("NFSD: Failed to remove expired client state directory" | |
2216d449 | 375 | " %.*s\n", HEXDIR_LEN, dname); |
c7b9a459 N |
376 | } |
377 | ||
378 | static int | |
52e19c09 | 379 | purge_old(struct dentry *parent, struct dentry *child, struct nfsd_net *nn) |
c7b9a459 N |
380 | { |
381 | int status; | |
382 | ||
52e19c09 | 383 | if (nfs4_has_reclaimed_state(child->d_name.name, nn)) |
b37ad28b | 384 | return 0; |
c7b9a459 | 385 | |
2f9092e1 | 386 | status = vfs_rmdir(parent->d_inode, child); |
c7b9a459 | 387 | if (status) |
a6a9f18f AV |
388 | printk("failed to remove client recovery directory %pd\n", |
389 | child); | |
c7b9a459 | 390 | /* Keep trying, success or failure: */ |
b37ad28b | 391 | return 0; |
c7b9a459 N |
392 | } |
393 | ||
2a4317c5 | 394 | static void |
12760c66 | 395 | nfsd4_recdir_purge_old(struct nfsd_net *nn, time_t boot_time) |
2a4317c5 | 396 | { |
c7b9a459 N |
397 | int status; |
398 | ||
f141f79d | 399 | nn->in_grace = false; |
3a073369 | 400 | if (!nn->rec_file) |
c7b9a459 | 401 | return; |
3a073369 | 402 | status = mnt_want_write_file(nn->rec_file); |
0622753b DH |
403 | if (status) |
404 | goto out; | |
52e19c09 | 405 | status = nfsd4_list_rec_dir(purge_old, nn); |
c7b9a459 | 406 | if (status == 0) |
3a073369 SK |
407 | vfs_fsync(nn->rec_file, 0); |
408 | mnt_drop_write_file(nn->rec_file); | |
0622753b | 409 | out: |
52e19c09 | 410 | nfs4_release_reclaim(nn); |
c7b9a459 N |
411 | if (status) |
412 | printk("nfsd4: failed to purge old clients from recovery" | |
a6a9f18f | 413 | " directory %pD\n", nn->rec_file); |
c7b9a459 N |
414 | } |
415 | ||
190e4fbf | 416 | static int |
52e19c09 | 417 | load_recdir(struct dentry *parent, struct dentry *child, struct nfsd_net *nn) |
190e4fbf N |
418 | { |
419 | if (child->d_name.len != HEXDIR_LEN - 1) { | |
a6a9f18f AV |
420 | printk("nfsd4: illegal name %pd in recovery directory\n", |
421 | child); | |
190e4fbf | 422 | /* Keep trying; maybe the others are OK: */ |
b37ad28b | 423 | return 0; |
190e4fbf | 424 | } |
52e19c09 | 425 | nfs4_client_to_reclaim(child->d_name.name, nn); |
b37ad28b | 426 | return 0; |
190e4fbf N |
427 | } |
428 | ||
2a4317c5 | 429 | static int |
52e19c09 | 430 | nfsd4_recdir_load(struct net *net) { |
190e4fbf | 431 | int status; |
52e19c09 | 432 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
190e4fbf | 433 | |
3a073369 | 434 | if (!nn->rec_file) |
e970a573 CH |
435 | return 0; |
436 | ||
52e19c09 | 437 | status = nfsd4_list_rec_dir(load_recdir, nn); |
190e4fbf N |
438 | if (status) |
439 | printk("nfsd4: failed loading clients from recovery" | |
a6a9f18f | 440 | " directory %pD\n", nn->rec_file); |
190e4fbf N |
441 | return status; |
442 | } | |
443 | ||
444 | /* | |
445 | * Hold reference to the recovery directory. | |
446 | */ | |
447 | ||
2a4317c5 | 448 | static int |
3a073369 | 449 | nfsd4_init_recdir(struct net *net) |
190e4fbf | 450 | { |
3a073369 | 451 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
d84f4f99 DH |
452 | const struct cred *original_cred; |
453 | int status; | |
190e4fbf N |
454 | |
455 | printk("NFSD: Using %s as the NFSv4 state recovery directory\n", | |
48483bf2 | 456 | user_recovery_dirname); |
190e4fbf | 457 | |
3a073369 | 458 | BUG_ON(nn->rec_file); |
190e4fbf | 459 | |
d84f4f99 DH |
460 | status = nfs4_save_creds(&original_cred); |
461 | if (status < 0) { | |
462 | printk("NFSD: Unable to change credentials to find recovery" | |
463 | " directory: error %d\n", | |
464 | status); | |
2a4317c5 | 465 | return status; |
d84f4f99 | 466 | } |
190e4fbf | 467 | |
3a073369 SK |
468 | nn->rec_file = filp_open(user_recovery_dirname, O_RDONLY | O_DIRECTORY, 0); |
469 | if (IS_ERR(nn->rec_file)) { | |
c2642ab0 | 470 | printk("NFSD: unable to find recovery directory %s\n", |
48483bf2 | 471 | user_recovery_dirname); |
3a073369 SK |
472 | status = PTR_ERR(nn->rec_file); |
473 | nn->rec_file = NULL; | |
e970a573 | 474 | } |
190e4fbf | 475 | |
d84f4f99 | 476 | nfs4_reset_creds(original_cred); |
0ce0c2b5 | 477 | if (!status) |
f141f79d | 478 | nn->in_grace = true; |
2a4317c5 | 479 | return status; |
190e4fbf N |
480 | } |
481 | ||
52e19c09 SK |
482 | |
483 | static int | |
484 | nfs4_legacy_state_init(struct net *net) | |
485 | { | |
486 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); | |
487 | int i; | |
488 | ||
489 | nn->reclaim_str_hashtbl = kmalloc(sizeof(struct list_head) * | |
490 | CLIENT_HASH_SIZE, GFP_KERNEL); | |
491 | if (!nn->reclaim_str_hashtbl) | |
492 | return -ENOMEM; | |
493 | ||
494 | for (i = 0; i < CLIENT_HASH_SIZE; i++) | |
495 | INIT_LIST_HEAD(&nn->reclaim_str_hashtbl[i]); | |
496 | nn->reclaim_str_hashtbl_size = 0; | |
497 | ||
498 | return 0; | |
499 | } | |
500 | ||
501 | static void | |
502 | nfs4_legacy_state_shutdown(struct net *net) | |
503 | { | |
504 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); | |
505 | ||
506 | kfree(nn->reclaim_str_hashtbl); | |
507 | } | |
508 | ||
2a4317c5 JL |
509 | static int |
510 | nfsd4_load_reboot_recovery_data(struct net *net) | |
511 | { | |
512 | int status; | |
513 | ||
3a073369 | 514 | status = nfsd4_init_recdir(net); |
52e19c09 SK |
515 | if (!status) |
516 | status = nfsd4_recdir_load(net); | |
52e19c09 SK |
517 | if (status) |
518 | printk(KERN_ERR "NFSD: Failure reading reboot recovery data\n"); | |
519 | return status; | |
520 | } | |
521 | ||
522 | static int | |
523 | nfsd4_legacy_tracking_init(struct net *net) | |
524 | { | |
525 | int status; | |
526 | ||
cc27e0d4 JL |
527 | /* XXX: The legacy code won't work in a container */ |
528 | if (net != &init_net) { | |
529 | WARN(1, KERN_ERR "NFSD: attempt to initialize legacy client " | |
530 | "tracking in a container!\n"); | |
531 | return -EINVAL; | |
532 | } | |
533 | ||
52e19c09 | 534 | status = nfs4_legacy_state_init(net); |
2a4317c5 | 535 | if (status) |
52e19c09 SK |
536 | return status; |
537 | ||
538 | status = nfsd4_load_reboot_recovery_data(net); | |
539 | if (status) | |
540 | goto err; | |
541 | return 0; | |
542 | ||
543 | err: | |
544 | nfs4_legacy_state_shutdown(net); | |
2a4317c5 JL |
545 | return status; |
546 | } | |
547 | ||
548 | static void | |
3a073369 | 549 | nfsd4_shutdown_recdir(struct nfsd_net *nn) |
190e4fbf | 550 | { |
3a073369 | 551 | if (!nn->rec_file) |
190e4fbf | 552 | return; |
3a073369 SK |
553 | fput(nn->rec_file); |
554 | nn->rec_file = NULL; | |
190e4fbf | 555 | } |
48483bf2 | 556 | |
2a4317c5 JL |
557 | static void |
558 | nfsd4_legacy_tracking_exit(struct net *net) | |
559 | { | |
52e19c09 SK |
560 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
561 | ||
562 | nfs4_release_reclaim(nn); | |
3a073369 | 563 | nfsd4_shutdown_recdir(nn); |
52e19c09 | 564 | nfs4_legacy_state_shutdown(net); |
2a4317c5 JL |
565 | } |
566 | ||
48483bf2 BF |
567 | /* |
568 | * Change the NFSv4 recovery directory to recdir. | |
569 | */ | |
570 | int | |
571 | nfs4_reset_recoverydir(char *recdir) | |
572 | { | |
573 | int status; | |
574 | struct path path; | |
575 | ||
576 | status = kern_path(recdir, LOOKUP_FOLLOW, &path); | |
577 | if (status) | |
578 | return status; | |
579 | status = -ENOTDIR; | |
580 | if (S_ISDIR(path.dentry->d_inode->i_mode)) { | |
581 | strcpy(user_recovery_dirname, recdir); | |
582 | status = 0; | |
583 | } | |
584 | path_put(&path); | |
585 | return status; | |
586 | } | |
587 | ||
588 | char * | |
589 | nfs4_recoverydir(void) | |
590 | { | |
591 | return user_recovery_dirname; | |
592 | } | |
2a4317c5 JL |
593 | |
594 | static int | |
595 | nfsd4_check_legacy_client(struct nfs4_client *clp) | |
596 | { | |
2216d449 JL |
597 | int status; |
598 | char dname[HEXDIR_LEN]; | |
0ce0c2b5 | 599 | struct nfs4_client_reclaim *crp; |
52e19c09 | 600 | struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); |
0ce0c2b5 | 601 | |
2a4317c5 JL |
602 | /* did we already find that this client is stable? */ |
603 | if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) | |
604 | return 0; | |
605 | ||
2216d449 JL |
606 | status = nfs4_make_rec_clidname(dname, &clp->cl_name); |
607 | if (status) { | |
7255e716 | 608 | legacy_recdir_name_error(clp, status); |
2216d449 JL |
609 | return status; |
610 | } | |
611 | ||
2a4317c5 | 612 | /* look for it in the reclaim hashtable otherwise */ |
52e19c09 | 613 | crp = nfsd4_find_reclaim_client(dname, nn); |
0ce0c2b5 | 614 | if (crp) { |
2a4317c5 | 615 | set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags); |
0ce0c2b5 | 616 | crp->cr_clp = clp; |
2a4317c5 JL |
617 | return 0; |
618 | } | |
619 | ||
620 | return -ENOENT; | |
621 | } | |
622 | ||
623 | static struct nfsd4_client_tracking_ops nfsd4_legacy_tracking_ops = { | |
52e19c09 | 624 | .init = nfsd4_legacy_tracking_init, |
2a4317c5 JL |
625 | .exit = nfsd4_legacy_tracking_exit, |
626 | .create = nfsd4_create_clid_dir, | |
627 | .remove = nfsd4_remove_clid_dir, | |
628 | .check = nfsd4_check_legacy_client, | |
629 | .grace_done = nfsd4_recdir_purge_old, | |
630 | }; | |
631 | ||
f3f80148 JL |
632 | /* Globals */ |
633 | #define NFSD_PIPE_DIR "nfsd" | |
634 | #define NFSD_CLD_PIPE "cld" | |
635 | ||
636 | /* per-net-ns structure for holding cld upcall info */ | |
637 | struct cld_net { | |
638 | struct rpc_pipe *cn_pipe; | |
639 | spinlock_t cn_lock; | |
640 | struct list_head cn_list; | |
641 | unsigned int cn_xid; | |
642 | }; | |
643 | ||
644 | struct cld_upcall { | |
645 | struct list_head cu_list; | |
646 | struct cld_net *cu_net; | |
647 | struct task_struct *cu_task; | |
648 | struct cld_msg cu_msg; | |
649 | }; | |
650 | ||
651 | static int | |
652 | __cld_pipe_upcall(struct rpc_pipe *pipe, struct cld_msg *cmsg) | |
653 | { | |
654 | int ret; | |
655 | struct rpc_pipe_msg msg; | |
656 | ||
657 | memset(&msg, 0, sizeof(msg)); | |
658 | msg.data = cmsg; | |
659 | msg.len = sizeof(*cmsg); | |
660 | ||
661 | /* | |
662 | * Set task state before we queue the upcall. That prevents | |
663 | * wake_up_process in the downcall from racing with schedule. | |
664 | */ | |
665 | set_current_state(TASK_UNINTERRUPTIBLE); | |
666 | ret = rpc_queue_upcall(pipe, &msg); | |
667 | if (ret < 0) { | |
668 | set_current_state(TASK_RUNNING); | |
669 | goto out; | |
670 | } | |
671 | ||
672 | schedule(); | |
673 | set_current_state(TASK_RUNNING); | |
674 | ||
675 | if (msg.errno < 0) | |
676 | ret = msg.errno; | |
677 | out: | |
678 | return ret; | |
679 | } | |
680 | ||
681 | static int | |
682 | cld_pipe_upcall(struct rpc_pipe *pipe, struct cld_msg *cmsg) | |
683 | { | |
684 | int ret; | |
685 | ||
686 | /* | |
687 | * -EAGAIN occurs when pipe is closed and reopened while there are | |
688 | * upcalls queued. | |
689 | */ | |
690 | do { | |
691 | ret = __cld_pipe_upcall(pipe, cmsg); | |
692 | } while (ret == -EAGAIN); | |
693 | ||
694 | return ret; | |
695 | } | |
696 | ||
697 | static ssize_t | |
698 | cld_pipe_downcall(struct file *filp, const char __user *src, size_t mlen) | |
699 | { | |
700 | struct cld_upcall *tmp, *cup; | |
bc1b542b | 701 | struct cld_msg __user *cmsg = (struct cld_msg __user *)src; |
f3f80148 JL |
702 | uint32_t xid; |
703 | struct nfsd_net *nn = net_generic(filp->f_dentry->d_sb->s_fs_info, | |
704 | nfsd_net_id); | |
705 | struct cld_net *cn = nn->cld_net; | |
706 | ||
707 | if (mlen != sizeof(*cmsg)) { | |
8a7dc4b0 | 708 | dprintk("%s: got %zu bytes, expected %zu\n", __func__, mlen, |
f3f80148 JL |
709 | sizeof(*cmsg)); |
710 | return -EINVAL; | |
711 | } | |
712 | ||
713 | /* copy just the xid so we can try to find that */ | |
714 | if (copy_from_user(&xid, &cmsg->cm_xid, sizeof(xid)) != 0) { | |
715 | dprintk("%s: error when copying xid from userspace", __func__); | |
716 | return -EFAULT; | |
717 | } | |
718 | ||
719 | /* walk the list and find corresponding xid */ | |
720 | cup = NULL; | |
721 | spin_lock(&cn->cn_lock); | |
722 | list_for_each_entry(tmp, &cn->cn_list, cu_list) { | |
723 | if (get_unaligned(&tmp->cu_msg.cm_xid) == xid) { | |
724 | cup = tmp; | |
725 | list_del_init(&cup->cu_list); | |
726 | break; | |
727 | } | |
728 | } | |
729 | spin_unlock(&cn->cn_lock); | |
730 | ||
731 | /* couldn't find upcall? */ | |
732 | if (!cup) { | |
21f72c9f | 733 | dprintk("%s: couldn't find upcall -- xid=%u\n", __func__, xid); |
f3f80148 JL |
734 | return -EINVAL; |
735 | } | |
736 | ||
737 | if (copy_from_user(&cup->cu_msg, src, mlen) != 0) | |
738 | return -EFAULT; | |
739 | ||
740 | wake_up_process(cup->cu_task); | |
741 | return mlen; | |
742 | } | |
743 | ||
744 | static void | |
745 | cld_pipe_destroy_msg(struct rpc_pipe_msg *msg) | |
746 | { | |
747 | struct cld_msg *cmsg = msg->data; | |
748 | struct cld_upcall *cup = container_of(cmsg, struct cld_upcall, | |
749 | cu_msg); | |
750 | ||
751 | /* errno >= 0 means we got a downcall */ | |
752 | if (msg->errno >= 0) | |
753 | return; | |
754 | ||
755 | wake_up_process(cup->cu_task); | |
756 | } | |
757 | ||
758 | static const struct rpc_pipe_ops cld_upcall_ops = { | |
759 | .upcall = rpc_pipe_generic_upcall, | |
760 | .downcall = cld_pipe_downcall, | |
761 | .destroy_msg = cld_pipe_destroy_msg, | |
762 | }; | |
763 | ||
764 | static struct dentry * | |
765 | nfsd4_cld_register_sb(struct super_block *sb, struct rpc_pipe *pipe) | |
766 | { | |
767 | struct dentry *dir, *dentry; | |
768 | ||
769 | dir = rpc_d_lookup_sb(sb, NFSD_PIPE_DIR); | |
770 | if (dir == NULL) | |
771 | return ERR_PTR(-ENOENT); | |
772 | dentry = rpc_mkpipe_dentry(dir, NFSD_CLD_PIPE, NULL, pipe); | |
773 | dput(dir); | |
774 | return dentry; | |
775 | } | |
776 | ||
777 | static void | |
778 | nfsd4_cld_unregister_sb(struct rpc_pipe *pipe) | |
779 | { | |
780 | if (pipe->dentry) | |
781 | rpc_unlink(pipe->dentry); | |
782 | } | |
783 | ||
784 | static struct dentry * | |
785 | nfsd4_cld_register_net(struct net *net, struct rpc_pipe *pipe) | |
786 | { | |
787 | struct super_block *sb; | |
788 | struct dentry *dentry; | |
789 | ||
790 | sb = rpc_get_sb_net(net); | |
791 | if (!sb) | |
792 | return NULL; | |
793 | dentry = nfsd4_cld_register_sb(sb, pipe); | |
794 | rpc_put_sb_net(net); | |
795 | return dentry; | |
796 | } | |
797 | ||
798 | static void | |
799 | nfsd4_cld_unregister_net(struct net *net, struct rpc_pipe *pipe) | |
800 | { | |
801 | struct super_block *sb; | |
802 | ||
803 | sb = rpc_get_sb_net(net); | |
804 | if (sb) { | |
805 | nfsd4_cld_unregister_sb(pipe); | |
806 | rpc_put_sb_net(net); | |
807 | } | |
808 | } | |
809 | ||
810 | /* Initialize rpc_pipefs pipe for communication with client tracking daemon */ | |
811 | static int | |
812 | nfsd4_init_cld_pipe(struct net *net) | |
813 | { | |
814 | int ret; | |
815 | struct dentry *dentry; | |
816 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); | |
817 | struct cld_net *cn; | |
818 | ||
819 | if (nn->cld_net) | |
820 | return 0; | |
821 | ||
822 | cn = kzalloc(sizeof(*cn), GFP_KERNEL); | |
823 | if (!cn) { | |
824 | ret = -ENOMEM; | |
825 | goto err; | |
826 | } | |
827 | ||
828 | cn->cn_pipe = rpc_mkpipe_data(&cld_upcall_ops, RPC_PIPE_WAIT_FOR_OPEN); | |
829 | if (IS_ERR(cn->cn_pipe)) { | |
830 | ret = PTR_ERR(cn->cn_pipe); | |
831 | goto err; | |
832 | } | |
833 | spin_lock_init(&cn->cn_lock); | |
834 | INIT_LIST_HEAD(&cn->cn_list); | |
835 | ||
836 | dentry = nfsd4_cld_register_net(net, cn->cn_pipe); | |
837 | if (IS_ERR(dentry)) { | |
838 | ret = PTR_ERR(dentry); | |
839 | goto err_destroy_data; | |
840 | } | |
841 | ||
842 | cn->cn_pipe->dentry = dentry; | |
843 | nn->cld_net = cn; | |
844 | return 0; | |
845 | ||
846 | err_destroy_data: | |
847 | rpc_destroy_pipe_data(cn->cn_pipe); | |
848 | err: | |
849 | kfree(cn); | |
850 | printk(KERN_ERR "NFSD: unable to create nfsdcld upcall pipe (%d)\n", | |
851 | ret); | |
852 | return ret; | |
853 | } | |
854 | ||
855 | static void | |
856 | nfsd4_remove_cld_pipe(struct net *net) | |
857 | { | |
858 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); | |
859 | struct cld_net *cn = nn->cld_net; | |
860 | ||
861 | nfsd4_cld_unregister_net(net, cn->cn_pipe); | |
862 | rpc_destroy_pipe_data(cn->cn_pipe); | |
863 | kfree(nn->cld_net); | |
864 | nn->cld_net = NULL; | |
865 | } | |
866 | ||
867 | static struct cld_upcall * | |
868 | alloc_cld_upcall(struct cld_net *cn) | |
869 | { | |
870 | struct cld_upcall *new, *tmp; | |
871 | ||
872 | new = kzalloc(sizeof(*new), GFP_KERNEL); | |
873 | if (!new) | |
874 | return new; | |
875 | ||
876 | /* FIXME: hard cap on number in flight? */ | |
877 | restart_search: | |
878 | spin_lock(&cn->cn_lock); | |
879 | list_for_each_entry(tmp, &cn->cn_list, cu_list) { | |
880 | if (tmp->cu_msg.cm_xid == cn->cn_xid) { | |
881 | cn->cn_xid++; | |
882 | spin_unlock(&cn->cn_lock); | |
883 | goto restart_search; | |
884 | } | |
885 | } | |
886 | new->cu_task = current; | |
887 | new->cu_msg.cm_vers = CLD_UPCALL_VERSION; | |
888 | put_unaligned(cn->cn_xid++, &new->cu_msg.cm_xid); | |
889 | new->cu_net = cn; | |
890 | list_add(&new->cu_list, &cn->cn_list); | |
891 | spin_unlock(&cn->cn_lock); | |
892 | ||
893 | dprintk("%s: allocated xid %u\n", __func__, new->cu_msg.cm_xid); | |
894 | ||
895 | return new; | |
896 | } | |
897 | ||
898 | static void | |
899 | free_cld_upcall(struct cld_upcall *victim) | |
900 | { | |
901 | struct cld_net *cn = victim->cu_net; | |
902 | ||
903 | spin_lock(&cn->cn_lock); | |
904 | list_del(&victim->cu_list); | |
905 | spin_unlock(&cn->cn_lock); | |
906 | kfree(victim); | |
907 | } | |
908 | ||
909 | /* Ask daemon to create a new record */ | |
910 | static void | |
911 | nfsd4_cld_create(struct nfs4_client *clp) | |
912 | { | |
913 | int ret; | |
914 | struct cld_upcall *cup; | |
c212cecf | 915 | struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); |
f3f80148 JL |
916 | struct cld_net *cn = nn->cld_net; |
917 | ||
918 | /* Don't upcall if it's already stored */ | |
919 | if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) | |
920 | return; | |
921 | ||
922 | cup = alloc_cld_upcall(cn); | |
923 | if (!cup) { | |
924 | ret = -ENOMEM; | |
925 | goto out_err; | |
926 | } | |
927 | ||
928 | cup->cu_msg.cm_cmd = Cld_Create; | |
929 | cup->cu_msg.cm_u.cm_name.cn_len = clp->cl_name.len; | |
930 | memcpy(cup->cu_msg.cm_u.cm_name.cn_id, clp->cl_name.data, | |
931 | clp->cl_name.len); | |
932 | ||
933 | ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_msg); | |
934 | if (!ret) { | |
935 | ret = cup->cu_msg.cm_status; | |
936 | set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags); | |
937 | } | |
938 | ||
939 | free_cld_upcall(cup); | |
940 | out_err: | |
941 | if (ret) | |
942 | printk(KERN_ERR "NFSD: Unable to create client " | |
943 | "record on stable storage: %d\n", ret); | |
944 | } | |
945 | ||
946 | /* Ask daemon to create a new record */ | |
947 | static void | |
948 | nfsd4_cld_remove(struct nfs4_client *clp) | |
949 | { | |
950 | int ret; | |
951 | struct cld_upcall *cup; | |
c212cecf | 952 | struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); |
f3f80148 JL |
953 | struct cld_net *cn = nn->cld_net; |
954 | ||
955 | /* Don't upcall if it's already removed */ | |
956 | if (!test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) | |
957 | return; | |
958 | ||
959 | cup = alloc_cld_upcall(cn); | |
960 | if (!cup) { | |
961 | ret = -ENOMEM; | |
962 | goto out_err; | |
963 | } | |
964 | ||
965 | cup->cu_msg.cm_cmd = Cld_Remove; | |
966 | cup->cu_msg.cm_u.cm_name.cn_len = clp->cl_name.len; | |
967 | memcpy(cup->cu_msg.cm_u.cm_name.cn_id, clp->cl_name.data, | |
968 | clp->cl_name.len); | |
969 | ||
970 | ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_msg); | |
971 | if (!ret) { | |
972 | ret = cup->cu_msg.cm_status; | |
973 | clear_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags); | |
974 | } | |
975 | ||
976 | free_cld_upcall(cup); | |
977 | out_err: | |
978 | if (ret) | |
979 | printk(KERN_ERR "NFSD: Unable to remove client " | |
980 | "record from stable storage: %d\n", ret); | |
981 | } | |
982 | ||
983 | /* Check for presence of a record, and update its timestamp */ | |
984 | static int | |
985 | nfsd4_cld_check(struct nfs4_client *clp) | |
986 | { | |
987 | int ret; | |
988 | struct cld_upcall *cup; | |
c212cecf | 989 | struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); |
f3f80148 JL |
990 | struct cld_net *cn = nn->cld_net; |
991 | ||
992 | /* Don't upcall if one was already stored during this grace pd */ | |
993 | if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) | |
994 | return 0; | |
995 | ||
996 | cup = alloc_cld_upcall(cn); | |
997 | if (!cup) { | |
998 | printk(KERN_ERR "NFSD: Unable to check client record on " | |
999 | "stable storage: %d\n", -ENOMEM); | |
1000 | return -ENOMEM; | |
1001 | } | |
1002 | ||
1003 | cup->cu_msg.cm_cmd = Cld_Check; | |
1004 | cup->cu_msg.cm_u.cm_name.cn_len = clp->cl_name.len; | |
1005 | memcpy(cup->cu_msg.cm_u.cm_name.cn_id, clp->cl_name.data, | |
1006 | clp->cl_name.len); | |
1007 | ||
1008 | ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_msg); | |
1009 | if (!ret) { | |
1010 | ret = cup->cu_msg.cm_status; | |
1011 | set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags); | |
1012 | } | |
1013 | ||
1014 | free_cld_upcall(cup); | |
1015 | return ret; | |
1016 | } | |
1017 | ||
1018 | static void | |
12760c66 | 1019 | nfsd4_cld_grace_done(struct nfsd_net *nn, time_t boot_time) |
f3f80148 JL |
1020 | { |
1021 | int ret; | |
1022 | struct cld_upcall *cup; | |
f3f80148 JL |
1023 | struct cld_net *cn = nn->cld_net; |
1024 | ||
1025 | cup = alloc_cld_upcall(cn); | |
1026 | if (!cup) { | |
1027 | ret = -ENOMEM; | |
1028 | goto out_err; | |
1029 | } | |
1030 | ||
1031 | cup->cu_msg.cm_cmd = Cld_GraceDone; | |
1032 | cup->cu_msg.cm_u.cm_gracetime = (int64_t)boot_time; | |
1033 | ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_msg); | |
1034 | if (!ret) | |
1035 | ret = cup->cu_msg.cm_status; | |
1036 | ||
1037 | free_cld_upcall(cup); | |
1038 | out_err: | |
1039 | if (ret) | |
1040 | printk(KERN_ERR "NFSD: Unable to end grace period: %d\n", ret); | |
1041 | } | |
1042 | ||
1043 | static struct nfsd4_client_tracking_ops nfsd4_cld_tracking_ops = { | |
1044 | .init = nfsd4_init_cld_pipe, | |
1045 | .exit = nfsd4_remove_cld_pipe, | |
1046 | .create = nfsd4_cld_create, | |
1047 | .remove = nfsd4_cld_remove, | |
1048 | .check = nfsd4_cld_check, | |
1049 | .grace_done = nfsd4_cld_grace_done, | |
1050 | }; | |
1051 | ||
2873d214 JL |
1052 | /* upcall via usermodehelper */ |
1053 | static char cltrack_prog[PATH_MAX] = "/sbin/nfsdcltrack"; | |
1054 | module_param_string(cltrack_prog, cltrack_prog, sizeof(cltrack_prog), | |
1055 | S_IRUGO|S_IWUSR); | |
1056 | MODULE_PARM_DESC(cltrack_prog, "Path to the nfsdcltrack upcall program"); | |
1057 | ||
f3aa7e24 JL |
1058 | static bool cltrack_legacy_disable; |
1059 | module_param(cltrack_legacy_disable, bool, S_IRUGO|S_IWUSR); | |
1060 | MODULE_PARM_DESC(cltrack_legacy_disable, | |
1061 | "Disable legacy recoverydir conversion. Default: false"); | |
1062 | ||
1063 | #define LEGACY_TOPDIR_ENV_PREFIX "NFSDCLTRACK_LEGACY_TOPDIR=" | |
1064 | #define LEGACY_RECDIR_ENV_PREFIX "NFSDCLTRACK_LEGACY_RECDIR=" | |
1065 | ||
1066 | static char * | |
1067 | nfsd4_cltrack_legacy_topdir(void) | |
1068 | { | |
1069 | int copied; | |
1070 | size_t len; | |
1071 | char *result; | |
1072 | ||
1073 | if (cltrack_legacy_disable) | |
1074 | return NULL; | |
1075 | ||
1076 | len = strlen(LEGACY_TOPDIR_ENV_PREFIX) + | |
1077 | strlen(nfs4_recoverydir()) + 1; | |
1078 | ||
1079 | result = kmalloc(len, GFP_KERNEL); | |
1080 | if (!result) | |
1081 | return result; | |
1082 | ||
1083 | copied = snprintf(result, len, LEGACY_TOPDIR_ENV_PREFIX "%s", | |
1084 | nfs4_recoverydir()); | |
1085 | if (copied >= len) { | |
1086 | /* just return nothing if output was truncated */ | |
1087 | kfree(result); | |
1088 | return NULL; | |
1089 | } | |
1090 | ||
1091 | return result; | |
1092 | } | |
1093 | ||
1094 | static char * | |
2216d449 | 1095 | nfsd4_cltrack_legacy_recdir(const struct xdr_netobj *name) |
f3aa7e24 JL |
1096 | { |
1097 | int copied; | |
1098 | size_t len; | |
1099 | char *result; | |
1100 | ||
1101 | if (cltrack_legacy_disable) | |
1102 | return NULL; | |
1103 | ||
1104 | /* +1 is for '/' between "topdir" and "recdir" */ | |
1105 | len = strlen(LEGACY_RECDIR_ENV_PREFIX) + | |
1106 | strlen(nfs4_recoverydir()) + 1 + HEXDIR_LEN; | |
1107 | ||
1108 | result = kmalloc(len, GFP_KERNEL); | |
1109 | if (!result) | |
1110 | return result; | |
1111 | ||
2216d449 JL |
1112 | copied = snprintf(result, len, LEGACY_RECDIR_ENV_PREFIX "%s/", |
1113 | nfs4_recoverydir()); | |
1114 | if (copied > (len - HEXDIR_LEN)) { | |
1115 | /* just return nothing if output will be truncated */ | |
1116 | kfree(result); | |
1117 | return NULL; | |
1118 | } | |
1119 | ||
1120 | copied = nfs4_make_rec_clidname(result + copied, name); | |
1121 | if (copied) { | |
f3aa7e24 JL |
1122 | kfree(result); |
1123 | return NULL; | |
1124 | } | |
1125 | ||
1126 | return result; | |
1127 | } | |
1128 | ||
2873d214 | 1129 | static int |
f3aa7e24 | 1130 | nfsd4_umh_cltrack_upcall(char *cmd, char *arg, char *legacy) |
2873d214 | 1131 | { |
f3aa7e24 | 1132 | char *envp[2]; |
2873d214 JL |
1133 | char *argv[4]; |
1134 | int ret; | |
1135 | ||
1136 | if (unlikely(!cltrack_prog[0])) { | |
1137 | dprintk("%s: cltrack_prog is disabled\n", __func__); | |
1138 | return -EACCES; | |
1139 | } | |
1140 | ||
1141 | dprintk("%s: cmd: %s\n", __func__, cmd); | |
1142 | dprintk("%s: arg: %s\n", __func__, arg ? arg : "(null)"); | |
f3aa7e24 JL |
1143 | dprintk("%s: legacy: %s\n", __func__, legacy ? legacy : "(null)"); |
1144 | ||
1145 | envp[0] = legacy; | |
1146 | envp[1] = NULL; | |
2873d214 JL |
1147 | |
1148 | argv[0] = (char *)cltrack_prog; | |
1149 | argv[1] = cmd; | |
1150 | argv[2] = arg; | |
1151 | argv[3] = NULL; | |
1152 | ||
1153 | ret = call_usermodehelper(argv[0], argv, envp, UMH_WAIT_PROC); | |
1154 | /* | |
1155 | * Disable the upcall mechanism if we're getting an ENOENT or EACCES | |
1156 | * error. The admin can re-enable it on the fly by using sysfs | |
1157 | * once the problem has been fixed. | |
1158 | */ | |
1159 | if (ret == -ENOENT || ret == -EACCES) { | |
1160 | dprintk("NFSD: %s was not found or isn't executable (%d). " | |
1161 | "Setting cltrack_prog to blank string!", | |
1162 | cltrack_prog, ret); | |
1163 | cltrack_prog[0] = '\0'; | |
1164 | } | |
1165 | dprintk("%s: %s return value: %d\n", __func__, cltrack_prog, ret); | |
1166 | ||
1167 | return ret; | |
1168 | } | |
1169 | ||
1170 | static char * | |
1171 | bin_to_hex_dup(const unsigned char *src, int srclen) | |
1172 | { | |
1173 | int i; | |
1174 | char *buf, *hex; | |
1175 | ||
1176 | /* +1 for terminating NULL */ | |
1177 | buf = kmalloc((srclen * 2) + 1, GFP_KERNEL); | |
1178 | if (!buf) | |
1179 | return buf; | |
1180 | ||
1181 | hex = buf; | |
1182 | for (i = 0; i < srclen; i++) { | |
1183 | sprintf(hex, "%2.2x", *src++); | |
1184 | hex += 2; | |
1185 | } | |
1186 | return buf; | |
1187 | } | |
1188 | ||
1189 | static int | |
1190 | nfsd4_umh_cltrack_init(struct net __attribute__((unused)) *net) | |
1191 | { | |
71a50306 SK |
1192 | /* XXX: The usermode helper s not working in container yet. */ |
1193 | if (net != &init_net) { | |
1194 | WARN(1, KERN_ERR "NFSD: attempt to initialize umh client " | |
1195 | "tracking in a container!\n"); | |
1196 | return -EINVAL; | |
1197 | } | |
f3aa7e24 | 1198 | return nfsd4_umh_cltrack_upcall("init", NULL, NULL); |
2873d214 JL |
1199 | } |
1200 | ||
1201 | static void | |
1202 | nfsd4_umh_cltrack_create(struct nfs4_client *clp) | |
1203 | { | |
1204 | char *hexid; | |
1205 | ||
1206 | hexid = bin_to_hex_dup(clp->cl_name.data, clp->cl_name.len); | |
1207 | if (!hexid) { | |
1208 | dprintk("%s: can't allocate memory for upcall!\n", __func__); | |
1209 | return; | |
1210 | } | |
f3aa7e24 | 1211 | nfsd4_umh_cltrack_upcall("create", hexid, NULL); |
2873d214 JL |
1212 | kfree(hexid); |
1213 | } | |
1214 | ||
1215 | static void | |
1216 | nfsd4_umh_cltrack_remove(struct nfs4_client *clp) | |
1217 | { | |
1218 | char *hexid; | |
1219 | ||
1220 | hexid = bin_to_hex_dup(clp->cl_name.data, clp->cl_name.len); | |
1221 | if (!hexid) { | |
1222 | dprintk("%s: can't allocate memory for upcall!\n", __func__); | |
1223 | return; | |
1224 | } | |
f3aa7e24 | 1225 | nfsd4_umh_cltrack_upcall("remove", hexid, NULL); |
2873d214 JL |
1226 | kfree(hexid); |
1227 | } | |
1228 | ||
1229 | static int | |
1230 | nfsd4_umh_cltrack_check(struct nfs4_client *clp) | |
1231 | { | |
1232 | int ret; | |
f3aa7e24 | 1233 | char *hexid, *legacy; |
2873d214 JL |
1234 | |
1235 | hexid = bin_to_hex_dup(clp->cl_name.data, clp->cl_name.len); | |
1236 | if (!hexid) { | |
1237 | dprintk("%s: can't allocate memory for upcall!\n", __func__); | |
1238 | return -ENOMEM; | |
1239 | } | |
2216d449 | 1240 | legacy = nfsd4_cltrack_legacy_recdir(&clp->cl_name); |
f3aa7e24 JL |
1241 | ret = nfsd4_umh_cltrack_upcall("check", hexid, legacy); |
1242 | kfree(legacy); | |
2873d214 JL |
1243 | kfree(hexid); |
1244 | return ret; | |
1245 | } | |
1246 | ||
1247 | static void | |
12760c66 | 1248 | nfsd4_umh_cltrack_grace_done(struct nfsd_net __attribute__((unused)) *nn, |
2873d214 JL |
1249 | time_t boot_time) |
1250 | { | |
f3aa7e24 | 1251 | char *legacy; |
2873d214 JL |
1252 | char timestr[22]; /* FIXME: better way to determine max size? */ |
1253 | ||
1254 | sprintf(timestr, "%ld", boot_time); | |
f3aa7e24 JL |
1255 | legacy = nfsd4_cltrack_legacy_topdir(); |
1256 | nfsd4_umh_cltrack_upcall("gracedone", timestr, legacy); | |
1257 | kfree(legacy); | |
2873d214 JL |
1258 | } |
1259 | ||
1260 | static struct nfsd4_client_tracking_ops nfsd4_umh_tracking_ops = { | |
1261 | .init = nfsd4_umh_cltrack_init, | |
1262 | .exit = NULL, | |
1263 | .create = nfsd4_umh_cltrack_create, | |
1264 | .remove = nfsd4_umh_cltrack_remove, | |
1265 | .check = nfsd4_umh_cltrack_check, | |
1266 | .grace_done = nfsd4_umh_cltrack_grace_done, | |
1267 | }; | |
1268 | ||
2a4317c5 JL |
1269 | int |
1270 | nfsd4_client_tracking_init(struct net *net) | |
1271 | { | |
1272 | int status; | |
f3f80148 | 1273 | struct path path; |
9a9c6478 | 1274 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
2a4317c5 | 1275 | |
2d77bf0a | 1276 | /* just run the init if it the method is already decided */ |
9a9c6478 | 1277 | if (nn->client_tracking_ops) |
2d77bf0a JL |
1278 | goto do_init; |
1279 | ||
1280 | /* | |
1281 | * First, try a UMH upcall. It should succeed or fail quickly, so | |
1282 | * there's little harm in trying that first. | |
1283 | */ | |
9a9c6478 SK |
1284 | nn->client_tracking_ops = &nfsd4_umh_tracking_ops; |
1285 | status = nn->client_tracking_ops->init(net); | |
2d77bf0a JL |
1286 | if (!status) |
1287 | return status; | |
1288 | ||
1289 | /* | |
1290 | * See if the recoverydir exists and is a directory. If it is, | |
1291 | * then use the legacy ops. | |
1292 | */ | |
9a9c6478 | 1293 | nn->client_tracking_ops = &nfsd4_legacy_tracking_ops; |
2d77bf0a JL |
1294 | status = kern_path(nfs4_recoverydir(), LOOKUP_FOLLOW, &path); |
1295 | if (!status) { | |
1296 | status = S_ISDIR(path.dentry->d_inode->i_mode); | |
1297 | path_put(&path); | |
1298 | if (status) | |
1299 | goto do_init; | |
f3f80148 | 1300 | } |
2a4317c5 | 1301 | |
2d77bf0a | 1302 | /* Finally, try to use nfsdcld */ |
9a9c6478 | 1303 | nn->client_tracking_ops = &nfsd4_cld_tracking_ops; |
8b0554e9 JL |
1304 | printk(KERN_WARNING "NFSD: the nfsdcld client tracking upcall will be " |
1305 | "removed in 3.10. Please transition to using " | |
1306 | "nfsdcltrack.\n"); | |
2d77bf0a | 1307 | do_init: |
9a9c6478 | 1308 | status = nn->client_tracking_ops->init(net); |
2a4317c5 JL |
1309 | if (status) { |
1310 | printk(KERN_WARNING "NFSD: Unable to initialize client " | |
1311 | "recovery tracking! (%d)\n", status); | |
9a9c6478 | 1312 | nn->client_tracking_ops = NULL; |
2a4317c5 JL |
1313 | } |
1314 | return status; | |
1315 | } | |
1316 | ||
1317 | void | |
1318 | nfsd4_client_tracking_exit(struct net *net) | |
1319 | { | |
9a9c6478 SK |
1320 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
1321 | ||
1322 | if (nn->client_tracking_ops) { | |
1323 | if (nn->client_tracking_ops->exit) | |
1324 | nn->client_tracking_ops->exit(net); | |
1325 | nn->client_tracking_ops = NULL; | |
2a4317c5 JL |
1326 | } |
1327 | } | |
1328 | ||
1329 | void | |
1330 | nfsd4_client_record_create(struct nfs4_client *clp) | |
1331 | { | |
9a9c6478 SK |
1332 | struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); |
1333 | ||
1334 | if (nn->client_tracking_ops) | |
1335 | nn->client_tracking_ops->create(clp); | |
2a4317c5 JL |
1336 | } |
1337 | ||
1338 | void | |
1339 | nfsd4_client_record_remove(struct nfs4_client *clp) | |
1340 | { | |
9a9c6478 SK |
1341 | struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); |
1342 | ||
1343 | if (nn->client_tracking_ops) | |
1344 | nn->client_tracking_ops->remove(clp); | |
2a4317c5 JL |
1345 | } |
1346 | ||
1347 | int | |
1348 | nfsd4_client_record_check(struct nfs4_client *clp) | |
1349 | { | |
9a9c6478 SK |
1350 | struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); |
1351 | ||
1352 | if (nn->client_tracking_ops) | |
1353 | return nn->client_tracking_ops->check(clp); | |
2a4317c5 JL |
1354 | |
1355 | return -EOPNOTSUPP; | |
1356 | } | |
1357 | ||
1358 | void | |
12760c66 | 1359 | nfsd4_record_grace_done(struct nfsd_net *nn, time_t boot_time) |
2a4317c5 | 1360 | { |
9a9c6478 SK |
1361 | if (nn->client_tracking_ops) |
1362 | nn->client_tracking_ops->grace_done(nn, boot_time); | |
2a4317c5 | 1363 | } |
813fd320 JL |
1364 | |
1365 | static int | |
1366 | rpc_pipefs_event(struct notifier_block *nb, unsigned long event, void *ptr) | |
1367 | { | |
1368 | struct super_block *sb = ptr; | |
1369 | struct net *net = sb->s_fs_info; | |
1370 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); | |
1371 | struct cld_net *cn = nn->cld_net; | |
1372 | struct dentry *dentry; | |
1373 | int ret = 0; | |
1374 | ||
1375 | if (!try_module_get(THIS_MODULE)) | |
1376 | return 0; | |
1377 | ||
1378 | if (!cn) { | |
1379 | module_put(THIS_MODULE); | |
1380 | return 0; | |
1381 | } | |
1382 | ||
1383 | switch (event) { | |
1384 | case RPC_PIPEFS_MOUNT: | |
1385 | dentry = nfsd4_cld_register_sb(sb, cn->cn_pipe); | |
1386 | if (IS_ERR(dentry)) { | |
1387 | ret = PTR_ERR(dentry); | |
1388 | break; | |
1389 | } | |
1390 | cn->cn_pipe->dentry = dentry; | |
1391 | break; | |
1392 | case RPC_PIPEFS_UMOUNT: | |
1393 | if (cn->cn_pipe->dentry) | |
1394 | nfsd4_cld_unregister_sb(cn->cn_pipe); | |
1395 | break; | |
1396 | default: | |
1397 | ret = -ENOTSUPP; | |
1398 | break; | |
1399 | } | |
1400 | module_put(THIS_MODULE); | |
1401 | return ret; | |
1402 | } | |
1403 | ||
2355c596 | 1404 | static struct notifier_block nfsd4_cld_block = { |
813fd320 JL |
1405 | .notifier_call = rpc_pipefs_event, |
1406 | }; | |
797a9d79 JL |
1407 | |
1408 | int | |
1409 | register_cld_notifier(void) | |
1410 | { | |
1411 | return rpc_pipefs_notifier_register(&nfsd4_cld_block); | |
1412 | } | |
1413 | ||
1414 | void | |
1415 | unregister_cld_notifier(void) | |
1416 | { | |
1417 | rpc_pipefs_notifier_unregister(&nfsd4_cld_block); | |
1418 | } |