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Commit | Line | Data |
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a55370a3 | 1 | /* |
a55370a3 | 2 | * Copyright (c) 2004 The Regents of the University of Michigan. |
f3f80148 | 3 | * Copyright (c) 2012 Jeff Layton <jlayton@redhat.com> |
a55370a3 N |
4 | * All rights reserved. |
5 | * | |
6 | * Andy Adamson <andros@citi.umich.edu> | |
7 | * | |
8 | * Redistribution and use in source and binary forms, with or without | |
9 | * modification, are permitted provided that the following conditions | |
10 | * are met: | |
11 | * | |
12 | * 1. Redistributions of source code must retain the above copyright | |
13 | * notice, this list of conditions and the following disclaimer. | |
14 | * 2. Redistributions in binary form must reproduce the above copyright | |
15 | * notice, this list of conditions and the following disclaimer in the | |
16 | * documentation and/or other materials provided with the distribution. | |
17 | * 3. Neither the name of the University nor the names of its | |
18 | * contributors may be used to endorse or promote products derived | |
19 | * from this software without specific prior written permission. | |
20 | * | |
21 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED | |
22 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF | |
23 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | |
24 | * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
26 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
27 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR | |
28 | * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF | |
29 | * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING | |
30 | * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS | |
31 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
32 | * | |
33 | */ | |
34 | ||
190e4fbf | 35 | #include <linux/file.h> |
5a0e3ad6 | 36 | #include <linux/slab.h> |
190e4fbf | 37 | #include <linux/namei.h> |
a55370a3 | 38 | #include <linux/crypto.h> |
e8edc6e0 | 39 | #include <linux/sched.h> |
f3f80148 | 40 | #include <linux/fs.h> |
813fd320 | 41 | #include <linux/module.h> |
f3f80148 JL |
42 | #include <net/net_namespace.h> |
43 | #include <linux/sunrpc/rpc_pipe_fs.h> | |
44 | #include <linux/sunrpc/clnt.h> | |
45 | #include <linux/nfsd/cld.h> | |
9a74af21 BH |
46 | |
47 | #include "nfsd.h" | |
48 | #include "state.h" | |
0a3adade | 49 | #include "vfs.h" |
f3f80148 | 50 | #include "netns.h" |
a55370a3 N |
51 | |
52 | #define NFSDDBG_FACILITY NFSDDBG_PROC | |
53 | ||
2a4317c5 JL |
54 | /* Declarations */ |
55 | struct nfsd4_client_tracking_ops { | |
56 | int (*init)(struct net *); | |
57 | void (*exit)(struct net *); | |
58 | void (*create)(struct nfs4_client *); | |
59 | void (*remove)(struct nfs4_client *); | |
60 | int (*check)(struct nfs4_client *); | |
919b8049 | 61 | void (*grace_done)(struct nfsd_net *); |
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 | 190 | if (status) |
c2236f14 | 191 | goto out_creds; |
4a55c101 | 192 | |
3a073369 | 193 | dir = nn->rec_file->f_path.dentry; |
c7b9a459 | 194 | /* lock the parent */ |
2b0143b5 | 195 | mutex_lock(&d_inode(dir)->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 | } | |
2b0143b5 | 202 | if (d_really_is_positive(dentry)) |
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; |
2b0143b5 | 212 | status = vfs_mkdir(d_inode(dir), dentry, S_IRWXU); |
c7b9a459 N |
213 | out_put: |
214 | dput(dentry); | |
215 | out_unlock: | |
2b0143b5 | 216 | mutex_unlock(&d_inode(dir)->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); |
c2236f14 | 231 | out_creds: |
d84f4f99 | 232 | nfs4_reset_creds(original_cred); |
c7b9a459 N |
233 | } |
234 | ||
52e19c09 | 235 | typedef int (recdir_func)(struct dentry *, struct dentry *, struct nfsd_net *); |
190e4fbf | 236 | |
05f4f678 BF |
237 | struct name_list { |
238 | char name[HEXDIR_LEN]; | |
190e4fbf N |
239 | struct list_head list; |
240 | }; | |
241 | ||
bb6f619b AV |
242 | struct nfs4_dir_ctx { |
243 | struct dir_context ctx; | |
244 | struct list_head names; | |
245 | }; | |
246 | ||
190e4fbf | 247 | static int |
ac7576f4 | 248 | nfsd4_build_namelist(struct dir_context *__ctx, const char *name, int namlen, |
afefdbb2 | 249 | loff_t offset, u64 ino, unsigned int d_type) |
190e4fbf | 250 | { |
ac7576f4 MS |
251 | struct nfs4_dir_ctx *ctx = |
252 | container_of(__ctx, struct nfs4_dir_ctx, ctx); | |
05f4f678 | 253 | struct name_list *entry; |
190e4fbf | 254 | |
05f4f678 | 255 | if (namlen != HEXDIR_LEN - 1) |
b37ad28b | 256 | return 0; |
05f4f678 BF |
257 | entry = kmalloc(sizeof(struct name_list), GFP_KERNEL); |
258 | if (entry == NULL) | |
190e4fbf | 259 | return -ENOMEM; |
05f4f678 BF |
260 | memcpy(entry->name, name, HEXDIR_LEN - 1); |
261 | entry->name[HEXDIR_LEN - 1] = '\0'; | |
bb6f619b | 262 | list_add(&entry->list, &ctx->names); |
190e4fbf N |
263 | return 0; |
264 | } | |
265 | ||
266 | static int | |
52e19c09 | 267 | nfsd4_list_rec_dir(recdir_func *f, struct nfsd_net *nn) |
190e4fbf | 268 | { |
d84f4f99 | 269 | const struct cred *original_cred; |
3a073369 | 270 | struct dentry *dir = nn->rec_file->f_path.dentry; |
ac6614b7 AV |
271 | struct nfs4_dir_ctx ctx = { |
272 | .ctx.actor = nfsd4_build_namelist, | |
273 | .names = LIST_HEAD_INIT(ctx.names) | |
274 | }; | |
4691b271 | 275 | struct name_list *entry, *tmp; |
190e4fbf N |
276 | int status; |
277 | ||
d84f4f99 DH |
278 | status = nfs4_save_creds(&original_cred); |
279 | if (status < 0) | |
280 | return status; | |
190e4fbf | 281 | |
3a073369 | 282 | status = vfs_llseek(nn->rec_file, 0, SEEK_SET); |
5b4b299c AV |
283 | if (status < 0) { |
284 | nfs4_reset_creds(original_cred); | |
285 | return status; | |
286 | } | |
287 | ||
5c0ba4e0 | 288 | status = iterate_dir(nn->rec_file, &ctx.ctx); |
2b0143b5 | 289 | mutex_lock_nested(&d_inode(dir)->i_mutex, I_MUTEX_PARENT); |
4691b271 KM |
290 | |
291 | list_for_each_entry_safe(entry, tmp, &ctx.names, list) { | |
5b4b299c AV |
292 | if (!status) { |
293 | struct dentry *dentry; | |
294 | dentry = lookup_one_len(entry->name, dir, HEXDIR_LEN-1); | |
295 | if (IS_ERR(dentry)) { | |
296 | status = PTR_ERR(dentry); | |
297 | break; | |
298 | } | |
52e19c09 | 299 | status = f(dir, dentry, nn); |
5b4b299c | 300 | dput(dentry); |
05f4f678 | 301 | } |
05f4f678 BF |
302 | list_del(&entry->list); |
303 | kfree(entry); | |
190e4fbf | 304 | } |
2b0143b5 | 305 | mutex_unlock(&d_inode(dir)->i_mutex); |
d84f4f99 | 306 | nfs4_reset_creds(original_cred); |
4691b271 KM |
307 | |
308 | list_for_each_entry_safe(entry, tmp, &ctx.names, list) { | |
309 | dprintk("NFSD: %s. Left entry %s\n", __func__, entry->name); | |
310 | list_del(&entry->list); | |
311 | kfree(entry); | |
312 | } | |
190e4fbf N |
313 | return status; |
314 | } | |
315 | ||
c7b9a459 | 316 | static int |
3a073369 | 317 | nfsd4_unlink_clid_dir(char *name, int namlen, struct nfsd_net *nn) |
c7b9a459 | 318 | { |
e970a573 | 319 | struct dentry *dir, *dentry; |
c7b9a459 N |
320 | int status; |
321 | ||
322 | dprintk("NFSD: nfsd4_unlink_clid_dir. name %.*s\n", namlen, name); | |
323 | ||
3a073369 | 324 | dir = nn->rec_file->f_path.dentry; |
2b0143b5 | 325 | mutex_lock_nested(&d_inode(dir)->i_mutex, I_MUTEX_PARENT); |
e970a573 | 326 | dentry = lookup_one_len(name, dir, namlen); |
c7b9a459 N |
327 | if (IS_ERR(dentry)) { |
328 | status = PTR_ERR(dentry); | |
2f9092e1 | 329 | goto out_unlock; |
c7b9a459 N |
330 | } |
331 | status = -ENOENT; | |
2b0143b5 | 332 | if (d_really_is_negative(dentry)) |
c7b9a459 | 333 | goto out; |
2b0143b5 | 334 | status = vfs_rmdir(d_inode(dir), dentry); |
c7b9a459 N |
335 | out: |
336 | dput(dentry); | |
2f9092e1 | 337 | out_unlock: |
2b0143b5 | 338 | mutex_unlock(&d_inode(dir)->i_mutex); |
c7b9a459 N |
339 | return status; |
340 | } | |
341 | ||
2a4317c5 | 342 | static void |
c7b9a459 N |
343 | nfsd4_remove_clid_dir(struct nfs4_client *clp) |
344 | { | |
d84f4f99 | 345 | const struct cred *original_cred; |
0ce0c2b5 | 346 | struct nfs4_client_reclaim *crp; |
2216d449 | 347 | char dname[HEXDIR_LEN]; |
c7b9a459 | 348 | int status; |
52e19c09 | 349 | struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); |
c7b9a459 | 350 | |
3a073369 | 351 | if (!nn->rec_file || !test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) |
c7b9a459 N |
352 | return; |
353 | ||
2216d449 JL |
354 | status = nfs4_make_rec_clidname(dname, &clp->cl_name); |
355 | if (status) | |
7255e716 | 356 | return legacy_recdir_name_error(clp, status); |
2216d449 | 357 | |
3a073369 | 358 | status = mnt_want_write_file(nn->rec_file); |
0622753b DH |
359 | if (status) |
360 | goto out; | |
a52d726b | 361 | clear_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags); |
d84f4f99 DH |
362 | |
363 | status = nfs4_save_creds(&original_cred); | |
364 | if (status < 0) | |
698d8d87 | 365 | goto out_drop_write; |
d84f4f99 | 366 | |
3a073369 | 367 | status = nfsd4_unlink_clid_dir(dname, HEXDIR_LEN-1, nn); |
d84f4f99 | 368 | nfs4_reset_creds(original_cred); |
0ce0c2b5 | 369 | if (status == 0) { |
3a073369 | 370 | vfs_fsync(nn->rec_file, 0); |
f141f79d | 371 | if (nn->in_grace) { |
0ce0c2b5 | 372 | /* remove reclaim record */ |
52e19c09 | 373 | crp = nfsd4_find_reclaim_client(dname, nn); |
0ce0c2b5 | 374 | if (crp) |
52e19c09 | 375 | nfs4_remove_reclaim_record(crp, nn); |
0ce0c2b5 JL |
376 | } |
377 | } | |
698d8d87 | 378 | out_drop_write: |
3a073369 | 379 | mnt_drop_write_file(nn->rec_file); |
0622753b | 380 | out: |
c7b9a459 N |
381 | if (status) |
382 | printk("NFSD: Failed to remove expired client state directory" | |
2216d449 | 383 | " %.*s\n", HEXDIR_LEN, dname); |
c7b9a459 N |
384 | } |
385 | ||
386 | static int | |
52e19c09 | 387 | purge_old(struct dentry *parent, struct dentry *child, struct nfsd_net *nn) |
c7b9a459 N |
388 | { |
389 | int status; | |
390 | ||
52e19c09 | 391 | if (nfs4_has_reclaimed_state(child->d_name.name, nn)) |
b37ad28b | 392 | return 0; |
c7b9a459 | 393 | |
2b0143b5 | 394 | status = vfs_rmdir(d_inode(parent), child); |
c7b9a459 | 395 | if (status) |
a6a9f18f AV |
396 | printk("failed to remove client recovery directory %pd\n", |
397 | child); | |
c7b9a459 | 398 | /* Keep trying, success or failure: */ |
b37ad28b | 399 | return 0; |
c7b9a459 N |
400 | } |
401 | ||
2a4317c5 | 402 | static void |
919b8049 | 403 | nfsd4_recdir_purge_old(struct nfsd_net *nn) |
2a4317c5 | 404 | { |
c7b9a459 N |
405 | int status; |
406 | ||
f141f79d | 407 | nn->in_grace = false; |
3a073369 | 408 | if (!nn->rec_file) |
c7b9a459 | 409 | return; |
3a073369 | 410 | status = mnt_want_write_file(nn->rec_file); |
0622753b DH |
411 | if (status) |
412 | goto out; | |
52e19c09 | 413 | status = nfsd4_list_rec_dir(purge_old, nn); |
c7b9a459 | 414 | if (status == 0) |
3a073369 SK |
415 | vfs_fsync(nn->rec_file, 0); |
416 | mnt_drop_write_file(nn->rec_file); | |
0622753b | 417 | out: |
52e19c09 | 418 | nfs4_release_reclaim(nn); |
c7b9a459 N |
419 | if (status) |
420 | printk("nfsd4: failed to purge old clients from recovery" | |
a6a9f18f | 421 | " directory %pD\n", nn->rec_file); |
c7b9a459 N |
422 | } |
423 | ||
190e4fbf | 424 | static int |
52e19c09 | 425 | load_recdir(struct dentry *parent, struct dentry *child, struct nfsd_net *nn) |
190e4fbf N |
426 | { |
427 | if (child->d_name.len != HEXDIR_LEN - 1) { | |
a6a9f18f AV |
428 | printk("nfsd4: illegal name %pd in recovery directory\n", |
429 | child); | |
190e4fbf | 430 | /* Keep trying; maybe the others are OK: */ |
b37ad28b | 431 | return 0; |
190e4fbf | 432 | } |
52e19c09 | 433 | nfs4_client_to_reclaim(child->d_name.name, nn); |
b37ad28b | 434 | return 0; |
190e4fbf N |
435 | } |
436 | ||
2a4317c5 | 437 | static int |
52e19c09 | 438 | nfsd4_recdir_load(struct net *net) { |
190e4fbf | 439 | int status; |
52e19c09 | 440 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
190e4fbf | 441 | |
3a073369 | 442 | if (!nn->rec_file) |
e970a573 CH |
443 | return 0; |
444 | ||
52e19c09 | 445 | status = nfsd4_list_rec_dir(load_recdir, nn); |
190e4fbf N |
446 | if (status) |
447 | printk("nfsd4: failed loading clients from recovery" | |
a6a9f18f | 448 | " directory %pD\n", nn->rec_file); |
190e4fbf N |
449 | return status; |
450 | } | |
451 | ||
452 | /* | |
453 | * Hold reference to the recovery directory. | |
454 | */ | |
455 | ||
2a4317c5 | 456 | static int |
3a073369 | 457 | nfsd4_init_recdir(struct net *net) |
190e4fbf | 458 | { |
3a073369 | 459 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
d84f4f99 DH |
460 | const struct cred *original_cred; |
461 | int status; | |
190e4fbf N |
462 | |
463 | printk("NFSD: Using %s as the NFSv4 state recovery directory\n", | |
48483bf2 | 464 | user_recovery_dirname); |
190e4fbf | 465 | |
3a073369 | 466 | BUG_ON(nn->rec_file); |
190e4fbf | 467 | |
d84f4f99 DH |
468 | status = nfs4_save_creds(&original_cred); |
469 | if (status < 0) { | |
470 | printk("NFSD: Unable to change credentials to find recovery" | |
471 | " directory: error %d\n", | |
472 | status); | |
2a4317c5 | 473 | return status; |
d84f4f99 | 474 | } |
190e4fbf | 475 | |
3a073369 SK |
476 | nn->rec_file = filp_open(user_recovery_dirname, O_RDONLY | O_DIRECTORY, 0); |
477 | if (IS_ERR(nn->rec_file)) { | |
c2642ab0 | 478 | printk("NFSD: unable to find recovery directory %s\n", |
48483bf2 | 479 | user_recovery_dirname); |
3a073369 SK |
480 | status = PTR_ERR(nn->rec_file); |
481 | nn->rec_file = NULL; | |
e970a573 | 482 | } |
190e4fbf | 483 | |
d84f4f99 | 484 | nfs4_reset_creds(original_cred); |
0ce0c2b5 | 485 | if (!status) |
f141f79d | 486 | nn->in_grace = true; |
2a4317c5 | 487 | return status; |
190e4fbf N |
488 | } |
489 | ||
15d176c1 KM |
490 | static void |
491 | nfsd4_shutdown_recdir(struct net *net) | |
492 | { | |
493 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); | |
494 | ||
495 | if (!nn->rec_file) | |
496 | return; | |
497 | fput(nn->rec_file); | |
498 | nn->rec_file = NULL; | |
499 | } | |
52e19c09 SK |
500 | |
501 | static int | |
502 | nfs4_legacy_state_init(struct net *net) | |
503 | { | |
504 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); | |
505 | int i; | |
506 | ||
507 | nn->reclaim_str_hashtbl = kmalloc(sizeof(struct list_head) * | |
508 | CLIENT_HASH_SIZE, GFP_KERNEL); | |
509 | if (!nn->reclaim_str_hashtbl) | |
510 | return -ENOMEM; | |
511 | ||
512 | for (i = 0; i < CLIENT_HASH_SIZE; i++) | |
513 | INIT_LIST_HEAD(&nn->reclaim_str_hashtbl[i]); | |
514 | nn->reclaim_str_hashtbl_size = 0; | |
515 | ||
516 | return 0; | |
517 | } | |
518 | ||
519 | static void | |
520 | nfs4_legacy_state_shutdown(struct net *net) | |
521 | { | |
522 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); | |
523 | ||
524 | kfree(nn->reclaim_str_hashtbl); | |
525 | } | |
526 | ||
2a4317c5 JL |
527 | static int |
528 | nfsd4_load_reboot_recovery_data(struct net *net) | |
529 | { | |
530 | int status; | |
531 | ||
3a073369 | 532 | status = nfsd4_init_recdir(net); |
52e19c09 | 533 | if (status) |
15d176c1 KM |
534 | return status; |
535 | ||
536 | status = nfsd4_recdir_load(net); | |
537 | if (status) | |
538 | nfsd4_shutdown_recdir(net); | |
539 | ||
52e19c09 SK |
540 | return status; |
541 | } | |
542 | ||
543 | static int | |
544 | nfsd4_legacy_tracking_init(struct net *net) | |
545 | { | |
546 | int status; | |
547 | ||
cc27e0d4 JL |
548 | /* XXX: The legacy code won't work in a container */ |
549 | if (net != &init_net) { | |
46cc8ba3 | 550 | pr_warn("NFSD: attempt to initialize legacy client tracking in a container ignored.\n"); |
cc27e0d4 JL |
551 | return -EINVAL; |
552 | } | |
553 | ||
52e19c09 | 554 | status = nfs4_legacy_state_init(net); |
2a4317c5 | 555 | if (status) |
52e19c09 SK |
556 | return status; |
557 | ||
558 | status = nfsd4_load_reboot_recovery_data(net); | |
559 | if (status) | |
560 | goto err; | |
561 | return 0; | |
562 | ||
563 | err: | |
564 | nfs4_legacy_state_shutdown(net); | |
2a4317c5 JL |
565 | return status; |
566 | } | |
567 | ||
2a4317c5 JL |
568 | static void |
569 | nfsd4_legacy_tracking_exit(struct net *net) | |
570 | { | |
52e19c09 SK |
571 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
572 | ||
573 | nfs4_release_reclaim(nn); | |
15d176c1 | 574 | nfsd4_shutdown_recdir(net); |
52e19c09 | 575 | nfs4_legacy_state_shutdown(net); |
2a4317c5 JL |
576 | } |
577 | ||
48483bf2 BF |
578 | /* |
579 | * Change the NFSv4 recovery directory to recdir. | |
580 | */ | |
581 | int | |
582 | nfs4_reset_recoverydir(char *recdir) | |
583 | { | |
584 | int status; | |
585 | struct path path; | |
586 | ||
587 | status = kern_path(recdir, LOOKUP_FOLLOW, &path); | |
588 | if (status) | |
589 | return status; | |
590 | status = -ENOTDIR; | |
e36cb0b8 | 591 | if (d_is_dir(path.dentry)) { |
48483bf2 BF |
592 | strcpy(user_recovery_dirname, recdir); |
593 | status = 0; | |
594 | } | |
595 | path_put(&path); | |
596 | return status; | |
597 | } | |
598 | ||
599 | char * | |
600 | nfs4_recoverydir(void) | |
601 | { | |
602 | return user_recovery_dirname; | |
603 | } | |
2a4317c5 JL |
604 | |
605 | static int | |
606 | nfsd4_check_legacy_client(struct nfs4_client *clp) | |
607 | { | |
2216d449 JL |
608 | int status; |
609 | char dname[HEXDIR_LEN]; | |
0ce0c2b5 | 610 | struct nfs4_client_reclaim *crp; |
52e19c09 | 611 | struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); |
0ce0c2b5 | 612 | |
2a4317c5 JL |
613 | /* did we already find that this client is stable? */ |
614 | if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) | |
615 | return 0; | |
616 | ||
2216d449 JL |
617 | status = nfs4_make_rec_clidname(dname, &clp->cl_name); |
618 | if (status) { | |
7255e716 | 619 | legacy_recdir_name_error(clp, status); |
2216d449 JL |
620 | return status; |
621 | } | |
622 | ||
2a4317c5 | 623 | /* look for it in the reclaim hashtable otherwise */ |
52e19c09 | 624 | crp = nfsd4_find_reclaim_client(dname, nn); |
0ce0c2b5 | 625 | if (crp) { |
2a4317c5 | 626 | set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags); |
0ce0c2b5 | 627 | crp->cr_clp = clp; |
2a4317c5 JL |
628 | return 0; |
629 | } | |
630 | ||
631 | return -ENOENT; | |
632 | } | |
633 | ||
634 | static struct nfsd4_client_tracking_ops nfsd4_legacy_tracking_ops = { | |
52e19c09 | 635 | .init = nfsd4_legacy_tracking_init, |
2a4317c5 JL |
636 | .exit = nfsd4_legacy_tracking_exit, |
637 | .create = nfsd4_create_clid_dir, | |
638 | .remove = nfsd4_remove_clid_dir, | |
639 | .check = nfsd4_check_legacy_client, | |
640 | .grace_done = nfsd4_recdir_purge_old, | |
641 | }; | |
642 | ||
f3f80148 JL |
643 | /* Globals */ |
644 | #define NFSD_PIPE_DIR "nfsd" | |
645 | #define NFSD_CLD_PIPE "cld" | |
646 | ||
647 | /* per-net-ns structure for holding cld upcall info */ | |
648 | struct cld_net { | |
649 | struct rpc_pipe *cn_pipe; | |
650 | spinlock_t cn_lock; | |
651 | struct list_head cn_list; | |
652 | unsigned int cn_xid; | |
653 | }; | |
654 | ||
655 | struct cld_upcall { | |
656 | struct list_head cu_list; | |
657 | struct cld_net *cu_net; | |
658 | struct task_struct *cu_task; | |
659 | struct cld_msg cu_msg; | |
660 | }; | |
661 | ||
662 | static int | |
663 | __cld_pipe_upcall(struct rpc_pipe *pipe, struct cld_msg *cmsg) | |
664 | { | |
665 | int ret; | |
666 | struct rpc_pipe_msg msg; | |
667 | ||
668 | memset(&msg, 0, sizeof(msg)); | |
669 | msg.data = cmsg; | |
670 | msg.len = sizeof(*cmsg); | |
671 | ||
672 | /* | |
673 | * Set task state before we queue the upcall. That prevents | |
674 | * wake_up_process in the downcall from racing with schedule. | |
675 | */ | |
676 | set_current_state(TASK_UNINTERRUPTIBLE); | |
677 | ret = rpc_queue_upcall(pipe, &msg); | |
678 | if (ret < 0) { | |
679 | set_current_state(TASK_RUNNING); | |
680 | goto out; | |
681 | } | |
682 | ||
683 | schedule(); | |
f3f80148 JL |
684 | |
685 | if (msg.errno < 0) | |
686 | ret = msg.errno; | |
687 | out: | |
688 | return ret; | |
689 | } | |
690 | ||
691 | static int | |
692 | cld_pipe_upcall(struct rpc_pipe *pipe, struct cld_msg *cmsg) | |
693 | { | |
694 | int ret; | |
695 | ||
696 | /* | |
697 | * -EAGAIN occurs when pipe is closed and reopened while there are | |
698 | * upcalls queued. | |
699 | */ | |
700 | do { | |
701 | ret = __cld_pipe_upcall(pipe, cmsg); | |
702 | } while (ret == -EAGAIN); | |
703 | ||
704 | return ret; | |
705 | } | |
706 | ||
707 | static ssize_t | |
708 | cld_pipe_downcall(struct file *filp, const char __user *src, size_t mlen) | |
709 | { | |
710 | struct cld_upcall *tmp, *cup; | |
bc1b542b | 711 | struct cld_msg __user *cmsg = (struct cld_msg __user *)src; |
f3f80148 | 712 | uint32_t xid; |
ef8a1a10 | 713 | struct nfsd_net *nn = net_generic(file_inode(filp)->i_sb->s_fs_info, |
f3f80148 JL |
714 | nfsd_net_id); |
715 | struct cld_net *cn = nn->cld_net; | |
716 | ||
717 | if (mlen != sizeof(*cmsg)) { | |
8a7dc4b0 | 718 | dprintk("%s: got %zu bytes, expected %zu\n", __func__, mlen, |
f3f80148 JL |
719 | sizeof(*cmsg)); |
720 | return -EINVAL; | |
721 | } | |
722 | ||
723 | /* copy just the xid so we can try to find that */ | |
724 | if (copy_from_user(&xid, &cmsg->cm_xid, sizeof(xid)) != 0) { | |
725 | dprintk("%s: error when copying xid from userspace", __func__); | |
726 | return -EFAULT; | |
727 | } | |
728 | ||
729 | /* walk the list and find corresponding xid */ | |
730 | cup = NULL; | |
731 | spin_lock(&cn->cn_lock); | |
732 | list_for_each_entry(tmp, &cn->cn_list, cu_list) { | |
733 | if (get_unaligned(&tmp->cu_msg.cm_xid) == xid) { | |
734 | cup = tmp; | |
735 | list_del_init(&cup->cu_list); | |
736 | break; | |
737 | } | |
738 | } | |
739 | spin_unlock(&cn->cn_lock); | |
740 | ||
741 | /* couldn't find upcall? */ | |
742 | if (!cup) { | |
21f72c9f | 743 | dprintk("%s: couldn't find upcall -- xid=%u\n", __func__, xid); |
f3f80148 JL |
744 | return -EINVAL; |
745 | } | |
746 | ||
747 | if (copy_from_user(&cup->cu_msg, src, mlen) != 0) | |
748 | return -EFAULT; | |
749 | ||
750 | wake_up_process(cup->cu_task); | |
751 | return mlen; | |
752 | } | |
753 | ||
754 | static void | |
755 | cld_pipe_destroy_msg(struct rpc_pipe_msg *msg) | |
756 | { | |
757 | struct cld_msg *cmsg = msg->data; | |
758 | struct cld_upcall *cup = container_of(cmsg, struct cld_upcall, | |
759 | cu_msg); | |
760 | ||
761 | /* errno >= 0 means we got a downcall */ | |
762 | if (msg->errno >= 0) | |
763 | return; | |
764 | ||
765 | wake_up_process(cup->cu_task); | |
766 | } | |
767 | ||
768 | static const struct rpc_pipe_ops cld_upcall_ops = { | |
769 | .upcall = rpc_pipe_generic_upcall, | |
770 | .downcall = cld_pipe_downcall, | |
771 | .destroy_msg = cld_pipe_destroy_msg, | |
772 | }; | |
773 | ||
774 | static struct dentry * | |
775 | nfsd4_cld_register_sb(struct super_block *sb, struct rpc_pipe *pipe) | |
776 | { | |
777 | struct dentry *dir, *dentry; | |
778 | ||
779 | dir = rpc_d_lookup_sb(sb, NFSD_PIPE_DIR); | |
780 | if (dir == NULL) | |
781 | return ERR_PTR(-ENOENT); | |
782 | dentry = rpc_mkpipe_dentry(dir, NFSD_CLD_PIPE, NULL, pipe); | |
783 | dput(dir); | |
784 | return dentry; | |
785 | } | |
786 | ||
787 | static void | |
788 | nfsd4_cld_unregister_sb(struct rpc_pipe *pipe) | |
789 | { | |
790 | if (pipe->dentry) | |
791 | rpc_unlink(pipe->dentry); | |
792 | } | |
793 | ||
794 | static struct dentry * | |
795 | nfsd4_cld_register_net(struct net *net, struct rpc_pipe *pipe) | |
796 | { | |
797 | struct super_block *sb; | |
798 | struct dentry *dentry; | |
799 | ||
800 | sb = rpc_get_sb_net(net); | |
801 | if (!sb) | |
802 | return NULL; | |
803 | dentry = nfsd4_cld_register_sb(sb, pipe); | |
804 | rpc_put_sb_net(net); | |
805 | return dentry; | |
806 | } | |
807 | ||
808 | static void | |
809 | nfsd4_cld_unregister_net(struct net *net, struct rpc_pipe *pipe) | |
810 | { | |
811 | struct super_block *sb; | |
812 | ||
813 | sb = rpc_get_sb_net(net); | |
814 | if (sb) { | |
815 | nfsd4_cld_unregister_sb(pipe); | |
816 | rpc_put_sb_net(net); | |
817 | } | |
818 | } | |
819 | ||
820 | /* Initialize rpc_pipefs pipe for communication with client tracking daemon */ | |
821 | static int | |
822 | nfsd4_init_cld_pipe(struct net *net) | |
823 | { | |
824 | int ret; | |
825 | struct dentry *dentry; | |
826 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); | |
827 | struct cld_net *cn; | |
828 | ||
829 | if (nn->cld_net) | |
830 | return 0; | |
831 | ||
832 | cn = kzalloc(sizeof(*cn), GFP_KERNEL); | |
833 | if (!cn) { | |
834 | ret = -ENOMEM; | |
835 | goto err; | |
836 | } | |
837 | ||
838 | cn->cn_pipe = rpc_mkpipe_data(&cld_upcall_ops, RPC_PIPE_WAIT_FOR_OPEN); | |
839 | if (IS_ERR(cn->cn_pipe)) { | |
840 | ret = PTR_ERR(cn->cn_pipe); | |
841 | goto err; | |
842 | } | |
843 | spin_lock_init(&cn->cn_lock); | |
844 | INIT_LIST_HEAD(&cn->cn_list); | |
845 | ||
846 | dentry = nfsd4_cld_register_net(net, cn->cn_pipe); | |
847 | if (IS_ERR(dentry)) { | |
848 | ret = PTR_ERR(dentry); | |
849 | goto err_destroy_data; | |
850 | } | |
851 | ||
852 | cn->cn_pipe->dentry = dentry; | |
853 | nn->cld_net = cn; | |
854 | return 0; | |
855 | ||
856 | err_destroy_data: | |
857 | rpc_destroy_pipe_data(cn->cn_pipe); | |
858 | err: | |
859 | kfree(cn); | |
860 | printk(KERN_ERR "NFSD: unable to create nfsdcld upcall pipe (%d)\n", | |
861 | ret); | |
862 | return ret; | |
863 | } | |
864 | ||
865 | static void | |
866 | nfsd4_remove_cld_pipe(struct net *net) | |
867 | { | |
868 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); | |
869 | struct cld_net *cn = nn->cld_net; | |
870 | ||
871 | nfsd4_cld_unregister_net(net, cn->cn_pipe); | |
872 | rpc_destroy_pipe_data(cn->cn_pipe); | |
873 | kfree(nn->cld_net); | |
874 | nn->cld_net = NULL; | |
875 | } | |
876 | ||
877 | static struct cld_upcall * | |
878 | alloc_cld_upcall(struct cld_net *cn) | |
879 | { | |
880 | struct cld_upcall *new, *tmp; | |
881 | ||
882 | new = kzalloc(sizeof(*new), GFP_KERNEL); | |
883 | if (!new) | |
884 | return new; | |
885 | ||
886 | /* FIXME: hard cap on number in flight? */ | |
887 | restart_search: | |
888 | spin_lock(&cn->cn_lock); | |
889 | list_for_each_entry(tmp, &cn->cn_list, cu_list) { | |
890 | if (tmp->cu_msg.cm_xid == cn->cn_xid) { | |
891 | cn->cn_xid++; | |
892 | spin_unlock(&cn->cn_lock); | |
893 | goto restart_search; | |
894 | } | |
895 | } | |
896 | new->cu_task = current; | |
897 | new->cu_msg.cm_vers = CLD_UPCALL_VERSION; | |
898 | put_unaligned(cn->cn_xid++, &new->cu_msg.cm_xid); | |
899 | new->cu_net = cn; | |
900 | list_add(&new->cu_list, &cn->cn_list); | |
901 | spin_unlock(&cn->cn_lock); | |
902 | ||
903 | dprintk("%s: allocated xid %u\n", __func__, new->cu_msg.cm_xid); | |
904 | ||
905 | return new; | |
906 | } | |
907 | ||
908 | static void | |
909 | free_cld_upcall(struct cld_upcall *victim) | |
910 | { | |
911 | struct cld_net *cn = victim->cu_net; | |
912 | ||
913 | spin_lock(&cn->cn_lock); | |
914 | list_del(&victim->cu_list); | |
915 | spin_unlock(&cn->cn_lock); | |
916 | kfree(victim); | |
917 | } | |
918 | ||
919 | /* Ask daemon to create a new record */ | |
920 | static void | |
921 | nfsd4_cld_create(struct nfs4_client *clp) | |
922 | { | |
923 | int ret; | |
924 | struct cld_upcall *cup; | |
c212cecf | 925 | struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); |
f3f80148 JL |
926 | struct cld_net *cn = nn->cld_net; |
927 | ||
928 | /* Don't upcall if it's already stored */ | |
929 | if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) | |
930 | return; | |
931 | ||
932 | cup = alloc_cld_upcall(cn); | |
933 | if (!cup) { | |
934 | ret = -ENOMEM; | |
935 | goto out_err; | |
936 | } | |
937 | ||
938 | cup->cu_msg.cm_cmd = Cld_Create; | |
939 | cup->cu_msg.cm_u.cm_name.cn_len = clp->cl_name.len; | |
940 | memcpy(cup->cu_msg.cm_u.cm_name.cn_id, clp->cl_name.data, | |
941 | clp->cl_name.len); | |
942 | ||
943 | ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_msg); | |
944 | if (!ret) { | |
945 | ret = cup->cu_msg.cm_status; | |
946 | set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags); | |
947 | } | |
948 | ||
949 | free_cld_upcall(cup); | |
950 | out_err: | |
951 | if (ret) | |
952 | printk(KERN_ERR "NFSD: Unable to create client " | |
953 | "record on stable storage: %d\n", ret); | |
954 | } | |
955 | ||
956 | /* Ask daemon to create a new record */ | |
957 | static void | |
958 | nfsd4_cld_remove(struct nfs4_client *clp) | |
959 | { | |
960 | int ret; | |
961 | struct cld_upcall *cup; | |
c212cecf | 962 | struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); |
f3f80148 JL |
963 | struct cld_net *cn = nn->cld_net; |
964 | ||
965 | /* Don't upcall if it's already removed */ | |
966 | if (!test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) | |
967 | return; | |
968 | ||
969 | cup = alloc_cld_upcall(cn); | |
970 | if (!cup) { | |
971 | ret = -ENOMEM; | |
972 | goto out_err; | |
973 | } | |
974 | ||
975 | cup->cu_msg.cm_cmd = Cld_Remove; | |
976 | cup->cu_msg.cm_u.cm_name.cn_len = clp->cl_name.len; | |
977 | memcpy(cup->cu_msg.cm_u.cm_name.cn_id, clp->cl_name.data, | |
978 | clp->cl_name.len); | |
979 | ||
980 | ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_msg); | |
981 | if (!ret) { | |
982 | ret = cup->cu_msg.cm_status; | |
983 | clear_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags); | |
984 | } | |
985 | ||
986 | free_cld_upcall(cup); | |
987 | out_err: | |
988 | if (ret) | |
989 | printk(KERN_ERR "NFSD: Unable to remove client " | |
990 | "record from stable storage: %d\n", ret); | |
991 | } | |
992 | ||
993 | /* Check for presence of a record, and update its timestamp */ | |
994 | static int | |
995 | nfsd4_cld_check(struct nfs4_client *clp) | |
996 | { | |
997 | int ret; | |
998 | struct cld_upcall *cup; | |
c212cecf | 999 | struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); |
f3f80148 JL |
1000 | struct cld_net *cn = nn->cld_net; |
1001 | ||
1002 | /* Don't upcall if one was already stored during this grace pd */ | |
1003 | if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) | |
1004 | return 0; | |
1005 | ||
1006 | cup = alloc_cld_upcall(cn); | |
1007 | if (!cup) { | |
1008 | printk(KERN_ERR "NFSD: Unable to check client record on " | |
1009 | "stable storage: %d\n", -ENOMEM); | |
1010 | return -ENOMEM; | |
1011 | } | |
1012 | ||
1013 | cup->cu_msg.cm_cmd = Cld_Check; | |
1014 | cup->cu_msg.cm_u.cm_name.cn_len = clp->cl_name.len; | |
1015 | memcpy(cup->cu_msg.cm_u.cm_name.cn_id, clp->cl_name.data, | |
1016 | clp->cl_name.len); | |
1017 | ||
1018 | ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_msg); | |
1019 | if (!ret) { | |
1020 | ret = cup->cu_msg.cm_status; | |
1021 | set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags); | |
1022 | } | |
1023 | ||
1024 | free_cld_upcall(cup); | |
1025 | return ret; | |
1026 | } | |
1027 | ||
1028 | static void | |
919b8049 | 1029 | nfsd4_cld_grace_done(struct nfsd_net *nn) |
f3f80148 JL |
1030 | { |
1031 | int ret; | |
1032 | struct cld_upcall *cup; | |
f3f80148 JL |
1033 | struct cld_net *cn = nn->cld_net; |
1034 | ||
1035 | cup = alloc_cld_upcall(cn); | |
1036 | if (!cup) { | |
1037 | ret = -ENOMEM; | |
1038 | goto out_err; | |
1039 | } | |
1040 | ||
1041 | cup->cu_msg.cm_cmd = Cld_GraceDone; | |
919b8049 | 1042 | cup->cu_msg.cm_u.cm_gracetime = (int64_t)nn->boot_time; |
f3f80148 JL |
1043 | ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_msg); |
1044 | if (!ret) | |
1045 | ret = cup->cu_msg.cm_status; | |
1046 | ||
1047 | free_cld_upcall(cup); | |
1048 | out_err: | |
1049 | if (ret) | |
1050 | printk(KERN_ERR "NFSD: Unable to end grace period: %d\n", ret); | |
1051 | } | |
1052 | ||
1053 | static struct nfsd4_client_tracking_ops nfsd4_cld_tracking_ops = { | |
1054 | .init = nfsd4_init_cld_pipe, | |
1055 | .exit = nfsd4_remove_cld_pipe, | |
1056 | .create = nfsd4_cld_create, | |
1057 | .remove = nfsd4_cld_remove, | |
1058 | .check = nfsd4_cld_check, | |
1059 | .grace_done = nfsd4_cld_grace_done, | |
1060 | }; | |
1061 | ||
2873d214 JL |
1062 | /* upcall via usermodehelper */ |
1063 | static char cltrack_prog[PATH_MAX] = "/sbin/nfsdcltrack"; | |
1064 | module_param_string(cltrack_prog, cltrack_prog, sizeof(cltrack_prog), | |
1065 | S_IRUGO|S_IWUSR); | |
1066 | MODULE_PARM_DESC(cltrack_prog, "Path to the nfsdcltrack upcall program"); | |
1067 | ||
f3aa7e24 JL |
1068 | static bool cltrack_legacy_disable; |
1069 | module_param(cltrack_legacy_disable, bool, S_IRUGO|S_IWUSR); | |
1070 | MODULE_PARM_DESC(cltrack_legacy_disable, | |
1071 | "Disable legacy recoverydir conversion. Default: false"); | |
1072 | ||
1073 | #define LEGACY_TOPDIR_ENV_PREFIX "NFSDCLTRACK_LEGACY_TOPDIR=" | |
1074 | #define LEGACY_RECDIR_ENV_PREFIX "NFSDCLTRACK_LEGACY_RECDIR=" | |
d4318acd JL |
1075 | #define HAS_SESSION_ENV_PREFIX "NFSDCLTRACK_CLIENT_HAS_SESSION=" |
1076 | #define GRACE_START_ENV_PREFIX "NFSDCLTRACK_GRACE_START=" | |
f3aa7e24 JL |
1077 | |
1078 | static char * | |
1079 | nfsd4_cltrack_legacy_topdir(void) | |
1080 | { | |
1081 | int copied; | |
1082 | size_t len; | |
1083 | char *result; | |
1084 | ||
1085 | if (cltrack_legacy_disable) | |
1086 | return NULL; | |
1087 | ||
1088 | len = strlen(LEGACY_TOPDIR_ENV_PREFIX) + | |
1089 | strlen(nfs4_recoverydir()) + 1; | |
1090 | ||
1091 | result = kmalloc(len, GFP_KERNEL); | |
1092 | if (!result) | |
1093 | return result; | |
1094 | ||
1095 | copied = snprintf(result, len, LEGACY_TOPDIR_ENV_PREFIX "%s", | |
1096 | nfs4_recoverydir()); | |
1097 | if (copied >= len) { | |
1098 | /* just return nothing if output was truncated */ | |
1099 | kfree(result); | |
1100 | return NULL; | |
1101 | } | |
1102 | ||
1103 | return result; | |
1104 | } | |
1105 | ||
1106 | static char * | |
2216d449 | 1107 | nfsd4_cltrack_legacy_recdir(const struct xdr_netobj *name) |
f3aa7e24 JL |
1108 | { |
1109 | int copied; | |
1110 | size_t len; | |
1111 | char *result; | |
1112 | ||
1113 | if (cltrack_legacy_disable) | |
1114 | return NULL; | |
1115 | ||
1116 | /* +1 is for '/' between "topdir" and "recdir" */ | |
1117 | len = strlen(LEGACY_RECDIR_ENV_PREFIX) + | |
1118 | strlen(nfs4_recoverydir()) + 1 + HEXDIR_LEN; | |
1119 | ||
1120 | result = kmalloc(len, GFP_KERNEL); | |
1121 | if (!result) | |
1122 | return result; | |
1123 | ||
2216d449 JL |
1124 | copied = snprintf(result, len, LEGACY_RECDIR_ENV_PREFIX "%s/", |
1125 | nfs4_recoverydir()); | |
1126 | if (copied > (len - HEXDIR_LEN)) { | |
1127 | /* just return nothing if output will be truncated */ | |
1128 | kfree(result); | |
1129 | return NULL; | |
1130 | } | |
1131 | ||
1132 | copied = nfs4_make_rec_clidname(result + copied, name); | |
1133 | if (copied) { | |
f3aa7e24 JL |
1134 | kfree(result); |
1135 | return NULL; | |
1136 | } | |
1137 | ||
1138 | return result; | |
1139 | } | |
1140 | ||
d4318acd JL |
1141 | static char * |
1142 | nfsd4_cltrack_client_has_session(struct nfs4_client *clp) | |
1143 | { | |
1144 | int copied; | |
1145 | size_t len; | |
1146 | char *result; | |
1147 | ||
1148 | /* prefix + Y/N character + terminating NULL */ | |
1149 | len = strlen(HAS_SESSION_ENV_PREFIX) + 1 + 1; | |
1150 | ||
1151 | result = kmalloc(len, GFP_KERNEL); | |
1152 | if (!result) | |
1153 | return result; | |
1154 | ||
1155 | copied = snprintf(result, len, HAS_SESSION_ENV_PREFIX "%c", | |
1156 | clp->cl_minorversion ? 'Y' : 'N'); | |
1157 | if (copied >= len) { | |
1158 | /* just return nothing if output was truncated */ | |
1159 | kfree(result); | |
1160 | return NULL; | |
1161 | } | |
1162 | ||
1163 | return result; | |
1164 | } | |
1165 | ||
1166 | static char * | |
1167 | nfsd4_cltrack_grace_start(time_t grace_start) | |
1168 | { | |
1169 | int copied; | |
1170 | size_t len; | |
1171 | char *result; | |
1172 | ||
1173 | /* prefix + max width of int64_t string + terminating NULL */ | |
1174 | len = strlen(GRACE_START_ENV_PREFIX) + 22 + 1; | |
1175 | ||
1176 | result = kmalloc(len, GFP_KERNEL); | |
1177 | if (!result) | |
1178 | return result; | |
1179 | ||
1180 | copied = snprintf(result, len, GRACE_START_ENV_PREFIX "%ld", | |
1181 | grace_start); | |
1182 | if (copied >= len) { | |
1183 | /* just return nothing if output was truncated */ | |
1184 | kfree(result); | |
1185 | return NULL; | |
1186 | } | |
1187 | ||
1188 | return result; | |
1189 | } | |
1190 | ||
2873d214 | 1191 | static int |
d4318acd | 1192 | nfsd4_umh_cltrack_upcall(char *cmd, char *arg, char *env0, char *env1) |
2873d214 | 1193 | { |
d4318acd | 1194 | char *envp[3]; |
2873d214 JL |
1195 | char *argv[4]; |
1196 | int ret; | |
1197 | ||
1198 | if (unlikely(!cltrack_prog[0])) { | |
1199 | dprintk("%s: cltrack_prog is disabled\n", __func__); | |
1200 | return -EACCES; | |
1201 | } | |
1202 | ||
1203 | dprintk("%s: cmd: %s\n", __func__, cmd); | |
1204 | dprintk("%s: arg: %s\n", __func__, arg ? arg : "(null)"); | |
d4318acd JL |
1205 | dprintk("%s: env0: %s\n", __func__, env0 ? env0 : "(null)"); |
1206 | dprintk("%s: env1: %s\n", __func__, env1 ? env1 : "(null)"); | |
f3aa7e24 | 1207 | |
d4318acd JL |
1208 | envp[0] = env0; |
1209 | envp[1] = env1; | |
1210 | envp[2] = NULL; | |
2873d214 JL |
1211 | |
1212 | argv[0] = (char *)cltrack_prog; | |
1213 | argv[1] = cmd; | |
1214 | argv[2] = arg; | |
1215 | argv[3] = NULL; | |
1216 | ||
1217 | ret = call_usermodehelper(argv[0], argv, envp, UMH_WAIT_PROC); | |
1218 | /* | |
1219 | * Disable the upcall mechanism if we're getting an ENOENT or EACCES | |
1220 | * error. The admin can re-enable it on the fly by using sysfs | |
1221 | * once the problem has been fixed. | |
1222 | */ | |
1223 | if (ret == -ENOENT || ret == -EACCES) { | |
1224 | dprintk("NFSD: %s was not found or isn't executable (%d). " | |
1225 | "Setting cltrack_prog to blank string!", | |
1226 | cltrack_prog, ret); | |
1227 | cltrack_prog[0] = '\0'; | |
1228 | } | |
1229 | dprintk("%s: %s return value: %d\n", __func__, cltrack_prog, ret); | |
1230 | ||
1231 | return ret; | |
1232 | } | |
1233 | ||
1234 | static char * | |
1235 | bin_to_hex_dup(const unsigned char *src, int srclen) | |
1236 | { | |
1237 | int i; | |
1238 | char *buf, *hex; | |
1239 | ||
1240 | /* +1 for terminating NULL */ | |
1241 | buf = kmalloc((srclen * 2) + 1, GFP_KERNEL); | |
1242 | if (!buf) | |
1243 | return buf; | |
1244 | ||
1245 | hex = buf; | |
1246 | for (i = 0; i < srclen; i++) { | |
1247 | sprintf(hex, "%2.2x", *src++); | |
1248 | hex += 2; | |
1249 | } | |
1250 | return buf; | |
1251 | } | |
1252 | ||
1253 | static int | |
d4318acd | 1254 | nfsd4_umh_cltrack_init(struct net *net) |
2873d214 | 1255 | { |
d4318acd JL |
1256 | int ret; |
1257 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); | |
1258 | char *grace_start = nfsd4_cltrack_grace_start(nn->boot_time); | |
1259 | ||
71a50306 SK |
1260 | /* XXX: The usermode helper s not working in container yet. */ |
1261 | if (net != &init_net) { | |
46cc8ba3 | 1262 | pr_warn("NFSD: attempt to initialize umh client tracking in a container ignored.\n"); |
71a50306 SK |
1263 | return -EINVAL; |
1264 | } | |
d4318acd JL |
1265 | |
1266 | ret = nfsd4_umh_cltrack_upcall("init", NULL, grace_start, NULL); | |
1267 | kfree(grace_start); | |
1268 | return ret; | |
2873d214 JL |
1269 | } |
1270 | ||
d682e750 JL |
1271 | static void |
1272 | nfsd4_cltrack_upcall_lock(struct nfs4_client *clp) | |
1273 | { | |
1274 | wait_on_bit_lock(&clp->cl_flags, NFSD4_CLIENT_UPCALL_LOCK, | |
1275 | TASK_UNINTERRUPTIBLE); | |
1276 | } | |
1277 | ||
1278 | static void | |
1279 | nfsd4_cltrack_upcall_unlock(struct nfs4_client *clp) | |
1280 | { | |
1281 | smp_mb__before_atomic(); | |
1282 | clear_bit(NFSD4_CLIENT_UPCALL_LOCK, &clp->cl_flags); | |
1283 | smp_mb__after_atomic(); | |
1284 | wake_up_bit(&clp->cl_flags, NFSD4_CLIENT_UPCALL_LOCK); | |
1285 | } | |
1286 | ||
2873d214 JL |
1287 | static void |
1288 | nfsd4_umh_cltrack_create(struct nfs4_client *clp) | |
1289 | { | |
d4318acd JL |
1290 | char *hexid, *has_session, *grace_start; |
1291 | struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); | |
2873d214 | 1292 | |
65decb65 JL |
1293 | /* |
1294 | * With v4.0 clients, there's little difference in outcome between a | |
1295 | * create and check operation, and we can end up calling into this | |
1296 | * function multiple times per client (once for each openowner). So, | |
1297 | * for v4.0 clients skip upcalling once the client has been recorded | |
1298 | * on stable storage. | |
1299 | * | |
1300 | * For v4.1+ clients, the outcome of the two operations is different, | |
1301 | * so we must ensure that we upcall for the create operation. v4.1+ | |
1302 | * clients call this on RECLAIM_COMPLETE though, so we should only end | |
1303 | * up doing a single create upcall per client. | |
1304 | */ | |
1305 | if (clp->cl_minorversion == 0 && | |
1306 | test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) | |
1307 | return; | |
1308 | ||
2873d214 JL |
1309 | hexid = bin_to_hex_dup(clp->cl_name.data, clp->cl_name.len); |
1310 | if (!hexid) { | |
1311 | dprintk("%s: can't allocate memory for upcall!\n", __func__); | |
1312 | return; | |
1313 | } | |
d682e750 | 1314 | |
d4318acd JL |
1315 | has_session = nfsd4_cltrack_client_has_session(clp); |
1316 | grace_start = nfsd4_cltrack_grace_start(nn->boot_time); | |
d682e750 JL |
1317 | |
1318 | nfsd4_cltrack_upcall_lock(clp); | |
788a7914 JL |
1319 | if (!nfsd4_umh_cltrack_upcall("create", hexid, has_session, grace_start)) |
1320 | set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags); | |
d682e750 JL |
1321 | nfsd4_cltrack_upcall_unlock(clp); |
1322 | ||
d4318acd JL |
1323 | kfree(has_session); |
1324 | kfree(grace_start); | |
2873d214 JL |
1325 | kfree(hexid); |
1326 | } | |
1327 | ||
1328 | static void | |
1329 | nfsd4_umh_cltrack_remove(struct nfs4_client *clp) | |
1330 | { | |
1331 | char *hexid; | |
1332 | ||
788a7914 JL |
1333 | if (!test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) |
1334 | return; | |
1335 | ||
2873d214 JL |
1336 | hexid = bin_to_hex_dup(clp->cl_name.data, clp->cl_name.len); |
1337 | if (!hexid) { | |
1338 | dprintk("%s: can't allocate memory for upcall!\n", __func__); | |
1339 | return; | |
1340 | } | |
d682e750 JL |
1341 | |
1342 | nfsd4_cltrack_upcall_lock(clp); | |
788a7914 JL |
1343 | if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags) && |
1344 | nfsd4_umh_cltrack_upcall("remove", hexid, NULL, NULL) == 0) | |
1345 | clear_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags); | |
d682e750 JL |
1346 | nfsd4_cltrack_upcall_unlock(clp); |
1347 | ||
2873d214 JL |
1348 | kfree(hexid); |
1349 | } | |
1350 | ||
1351 | static int | |
1352 | nfsd4_umh_cltrack_check(struct nfs4_client *clp) | |
1353 | { | |
1354 | int ret; | |
d4318acd | 1355 | char *hexid, *has_session, *legacy; |
2873d214 | 1356 | |
788a7914 JL |
1357 | if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) |
1358 | return 0; | |
1359 | ||
2873d214 JL |
1360 | hexid = bin_to_hex_dup(clp->cl_name.data, clp->cl_name.len); |
1361 | if (!hexid) { | |
1362 | dprintk("%s: can't allocate memory for upcall!\n", __func__); | |
1363 | return -ENOMEM; | |
1364 | } | |
d4318acd JL |
1365 | |
1366 | has_session = nfsd4_cltrack_client_has_session(clp); | |
2216d449 | 1367 | legacy = nfsd4_cltrack_legacy_recdir(&clp->cl_name); |
d682e750 JL |
1368 | |
1369 | nfsd4_cltrack_upcall_lock(clp); | |
788a7914 JL |
1370 | if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) { |
1371 | ret = 0; | |
1372 | } else { | |
1373 | ret = nfsd4_umh_cltrack_upcall("check", hexid, has_session, legacy); | |
1374 | if (ret == 0) | |
1375 | set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags); | |
1376 | } | |
d682e750 | 1377 | nfsd4_cltrack_upcall_unlock(clp); |
d4318acd | 1378 | kfree(has_session); |
f3aa7e24 | 1379 | kfree(legacy); |
2873d214 | 1380 | kfree(hexid); |
d4318acd | 1381 | |
2873d214 JL |
1382 | return ret; |
1383 | } | |
1384 | ||
1385 | static void | |
919b8049 | 1386 | nfsd4_umh_cltrack_grace_done(struct nfsd_net *nn) |
2873d214 | 1387 | { |
f3aa7e24 | 1388 | char *legacy; |
2873d214 JL |
1389 | char timestr[22]; /* FIXME: better way to determine max size? */ |
1390 | ||
919b8049 | 1391 | sprintf(timestr, "%ld", nn->boot_time); |
f3aa7e24 | 1392 | legacy = nfsd4_cltrack_legacy_topdir(); |
d4318acd | 1393 | nfsd4_umh_cltrack_upcall("gracedone", timestr, legacy, NULL); |
f3aa7e24 | 1394 | kfree(legacy); |
2873d214 JL |
1395 | } |
1396 | ||
1397 | static struct nfsd4_client_tracking_ops nfsd4_umh_tracking_ops = { | |
1398 | .init = nfsd4_umh_cltrack_init, | |
1399 | .exit = NULL, | |
1400 | .create = nfsd4_umh_cltrack_create, | |
1401 | .remove = nfsd4_umh_cltrack_remove, | |
1402 | .check = nfsd4_umh_cltrack_check, | |
1403 | .grace_done = nfsd4_umh_cltrack_grace_done, | |
1404 | }; | |
1405 | ||
2a4317c5 JL |
1406 | int |
1407 | nfsd4_client_tracking_init(struct net *net) | |
1408 | { | |
1409 | int status; | |
f3f80148 | 1410 | struct path path; |
9a9c6478 | 1411 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
2a4317c5 | 1412 | |
2d77bf0a | 1413 | /* just run the init if it the method is already decided */ |
9a9c6478 | 1414 | if (nn->client_tracking_ops) |
2d77bf0a JL |
1415 | goto do_init; |
1416 | ||
1417 | /* | |
1418 | * First, try a UMH upcall. It should succeed or fail quickly, so | |
1419 | * there's little harm in trying that first. | |
1420 | */ | |
9a9c6478 SK |
1421 | nn->client_tracking_ops = &nfsd4_umh_tracking_ops; |
1422 | status = nn->client_tracking_ops->init(net); | |
2d77bf0a JL |
1423 | if (!status) |
1424 | return status; | |
1425 | ||
1426 | /* | |
1427 | * See if the recoverydir exists and is a directory. If it is, | |
1428 | * then use the legacy ops. | |
1429 | */ | |
9a9c6478 | 1430 | nn->client_tracking_ops = &nfsd4_legacy_tracking_ops; |
2d77bf0a JL |
1431 | status = kern_path(nfs4_recoverydir(), LOOKUP_FOLLOW, &path); |
1432 | if (!status) { | |
e36cb0b8 | 1433 | status = d_is_dir(path.dentry); |
2d77bf0a JL |
1434 | path_put(&path); |
1435 | if (status) | |
1436 | goto do_init; | |
f3f80148 | 1437 | } |
2a4317c5 | 1438 | |
2d77bf0a | 1439 | /* Finally, try to use nfsdcld */ |
9a9c6478 | 1440 | nn->client_tracking_ops = &nfsd4_cld_tracking_ops; |
8b0554e9 JL |
1441 | printk(KERN_WARNING "NFSD: the nfsdcld client tracking upcall will be " |
1442 | "removed in 3.10. Please transition to using " | |
1443 | "nfsdcltrack.\n"); | |
2d77bf0a | 1444 | do_init: |
9a9c6478 | 1445 | status = nn->client_tracking_ops->init(net); |
2a4317c5 JL |
1446 | if (status) { |
1447 | printk(KERN_WARNING "NFSD: Unable to initialize client " | |
1448 | "recovery tracking! (%d)\n", status); | |
9a9c6478 | 1449 | nn->client_tracking_ops = NULL; |
2a4317c5 JL |
1450 | } |
1451 | return status; | |
1452 | } | |
1453 | ||
1454 | void | |
1455 | nfsd4_client_tracking_exit(struct net *net) | |
1456 | { | |
9a9c6478 SK |
1457 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
1458 | ||
1459 | if (nn->client_tracking_ops) { | |
1460 | if (nn->client_tracking_ops->exit) | |
1461 | nn->client_tracking_ops->exit(net); | |
1462 | nn->client_tracking_ops = NULL; | |
2a4317c5 JL |
1463 | } |
1464 | } | |
1465 | ||
1466 | void | |
1467 | nfsd4_client_record_create(struct nfs4_client *clp) | |
1468 | { | |
9a9c6478 SK |
1469 | struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); |
1470 | ||
1471 | if (nn->client_tracking_ops) | |
1472 | nn->client_tracking_ops->create(clp); | |
2a4317c5 JL |
1473 | } |
1474 | ||
1475 | void | |
1476 | nfsd4_client_record_remove(struct nfs4_client *clp) | |
1477 | { | |
9a9c6478 SK |
1478 | struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); |
1479 | ||
1480 | if (nn->client_tracking_ops) | |
1481 | nn->client_tracking_ops->remove(clp); | |
2a4317c5 JL |
1482 | } |
1483 | ||
1484 | int | |
1485 | nfsd4_client_record_check(struct nfs4_client *clp) | |
1486 | { | |
9a9c6478 SK |
1487 | struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); |
1488 | ||
1489 | if (nn->client_tracking_ops) | |
1490 | return nn->client_tracking_ops->check(clp); | |
2a4317c5 JL |
1491 | |
1492 | return -EOPNOTSUPP; | |
1493 | } | |
1494 | ||
1495 | void | |
919b8049 | 1496 | nfsd4_record_grace_done(struct nfsd_net *nn) |
2a4317c5 | 1497 | { |
9a9c6478 | 1498 | if (nn->client_tracking_ops) |
919b8049 | 1499 | nn->client_tracking_ops->grace_done(nn); |
2a4317c5 | 1500 | } |
813fd320 JL |
1501 | |
1502 | static int | |
1503 | rpc_pipefs_event(struct notifier_block *nb, unsigned long event, void *ptr) | |
1504 | { | |
1505 | struct super_block *sb = ptr; | |
1506 | struct net *net = sb->s_fs_info; | |
1507 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); | |
1508 | struct cld_net *cn = nn->cld_net; | |
1509 | struct dentry *dentry; | |
1510 | int ret = 0; | |
1511 | ||
1512 | if (!try_module_get(THIS_MODULE)) | |
1513 | return 0; | |
1514 | ||
1515 | if (!cn) { | |
1516 | module_put(THIS_MODULE); | |
1517 | return 0; | |
1518 | } | |
1519 | ||
1520 | switch (event) { | |
1521 | case RPC_PIPEFS_MOUNT: | |
1522 | dentry = nfsd4_cld_register_sb(sb, cn->cn_pipe); | |
1523 | if (IS_ERR(dentry)) { | |
1524 | ret = PTR_ERR(dentry); | |
1525 | break; | |
1526 | } | |
1527 | cn->cn_pipe->dentry = dentry; | |
1528 | break; | |
1529 | case RPC_PIPEFS_UMOUNT: | |
1530 | if (cn->cn_pipe->dentry) | |
1531 | nfsd4_cld_unregister_sb(cn->cn_pipe); | |
1532 | break; | |
1533 | default: | |
1534 | ret = -ENOTSUPP; | |
1535 | break; | |
1536 | } | |
1537 | module_put(THIS_MODULE); | |
1538 | return ret; | |
1539 | } | |
1540 | ||
2355c596 | 1541 | static struct notifier_block nfsd4_cld_block = { |
813fd320 JL |
1542 | .notifier_call = rpc_pipefs_event, |
1543 | }; | |
797a9d79 JL |
1544 | |
1545 | int | |
1546 | register_cld_notifier(void) | |
1547 | { | |
1548 | return rpc_pipefs_notifier_register(&nfsd4_cld_block); | |
1549 | } | |
1550 | ||
1551 | void | |
1552 | unregister_cld_notifier(void) | |
1553 | { | |
1554 | rpc_pipefs_notifier_unregister(&nfsd4_cld_block); | |
1555 | } |