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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 | ||
1edb82d2 | 35 | #include <crypto/hash.h> |
190e4fbf | 36 | #include <linux/file.h> |
5a0e3ad6 | 37 | #include <linux/slab.h> |
190e4fbf | 38 | #include <linux/namei.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 *); |
11a60d15 SM |
62 | uint8_t version; |
63 | size_t msglen; | |
2a4317c5 JL |
64 | }; |
65 | ||
11a60d15 | 66 | static const struct nfsd4_client_tracking_ops nfsd4_cld_tracking_ops; |
6ee95d1c | 67 | static const struct nfsd4_client_tracking_ops nfsd4_cld_tracking_ops_v2; |
11a60d15 | 68 | |
190e4fbf | 69 | /* Globals */ |
48483bf2 | 70 | static char user_recovery_dirname[PATH_MAX] = "/var/lib/nfs/v4recovery"; |
190e4fbf | 71 | |
d84f4f99 DH |
72 | static int |
73 | nfs4_save_creds(const struct cred **original_creds) | |
190e4fbf | 74 | { |
d84f4f99 DH |
75 | struct cred *new; |
76 | ||
77 | new = prepare_creds(); | |
78 | if (!new) | |
79 | return -ENOMEM; | |
80 | ||
6fab8779 EB |
81 | new->fsuid = GLOBAL_ROOT_UID; |
82 | new->fsgid = GLOBAL_ROOT_GID; | |
d84f4f99 DH |
83 | *original_creds = override_creds(new); |
84 | put_cred(new); | |
85 | return 0; | |
190e4fbf N |
86 | } |
87 | ||
88 | static void | |
d84f4f99 | 89 | nfs4_reset_creds(const struct cred *original) |
190e4fbf | 90 | { |
d84f4f99 | 91 | revert_creds(original); |
190e4fbf N |
92 | } |
93 | ||
a55370a3 N |
94 | static void |
95 | md5_to_hex(char *out, char *md5) | |
96 | { | |
97 | int i; | |
98 | ||
99 | for (i=0; i<16; i++) { | |
100 | unsigned char c = md5[i]; | |
101 | ||
102 | *out++ = '0' + ((c&0xf0)>>4) + (c>=0xa0)*('a'-'9'-1); | |
103 | *out++ = '0' + (c&0x0f) + ((c&0x0f)>=0x0a)*('a'-'9'-1); | |
104 | } | |
105 | *out = '\0'; | |
106 | } | |
107 | ||
2216d449 JL |
108 | static int |
109 | nfs4_make_rec_clidname(char *dname, const struct xdr_netobj *clname) | |
a55370a3 N |
110 | { |
111 | struct xdr_netobj cksum; | |
1edb82d2 | 112 | struct crypto_shash *tfm; |
2216d449 | 113 | int status; |
a55370a3 N |
114 | |
115 | dprintk("NFSD: nfs4_make_rec_clidname for %.*s\n", | |
116 | clname->len, clname->data); | |
1edb82d2 HX |
117 | tfm = crypto_alloc_shash("md5", 0, 0); |
118 | if (IS_ERR(tfm)) { | |
119 | status = PTR_ERR(tfm); | |
35058687 | 120 | goto out_no_tfm; |
2216d449 JL |
121 | } |
122 | ||
1edb82d2 | 123 | cksum.len = crypto_shash_digestsize(tfm); |
a55370a3 | 124 | cksum.data = kmalloc(cksum.len, GFP_KERNEL); |
2216d449 JL |
125 | if (cksum.data == NULL) { |
126 | status = -ENOMEM; | |
a55370a3 | 127 | goto out; |
2216d449 | 128 | } |
a55370a3 | 129 | |
1edb82d2 HX |
130 | { |
131 | SHASH_DESC_ON_STACK(desc, tfm); | |
132 | ||
133 | desc->tfm = tfm; | |
1edb82d2 HX |
134 | |
135 | status = crypto_shash_digest(desc, clname->data, clname->len, | |
136 | cksum.data); | |
137 | shash_desc_zero(desc); | |
138 | } | |
a55370a3 | 139 | |
2216d449 | 140 | if (status) |
35058687 | 141 | goto out; |
a55370a3 N |
142 | |
143 | md5_to_hex(dname, cksum.data); | |
144 | ||
2216d449 | 145 | status = 0; |
a55370a3 | 146 | out: |
2bd9e7b6 | 147 | kfree(cksum.data); |
1edb82d2 | 148 | crypto_free_shash(tfm); |
35058687 | 149 | out_no_tfm: |
a55370a3 N |
150 | return status; |
151 | } | |
190e4fbf | 152 | |
2216d449 JL |
153 | /* |
154 | * If we had an error generating the recdir name for the legacy tracker | |
155 | * then warn the admin. If the error doesn't appear to be transient, | |
156 | * then disable recovery tracking. | |
157 | */ | |
158 | static void | |
7255e716 | 159 | legacy_recdir_name_error(struct nfs4_client *clp, int error) |
2216d449 JL |
160 | { |
161 | printk(KERN_ERR "NFSD: unable to generate recoverydir " | |
162 | "name (%d).\n", error); | |
163 | ||
164 | /* | |
165 | * if the algorithm just doesn't exist, then disable the recovery | |
166 | * tracker altogether. The crypto libs will generally return this if | |
167 | * FIPS is enabled as well. | |
168 | */ | |
169 | if (error == -ENOENT) { | |
170 | printk(KERN_ERR "NFSD: disabling legacy clientid tracking. " | |
171 | "Reboot recovery will not function correctly!\n"); | |
7255e716 | 172 | nfsd4_client_tracking_exit(clp->net); |
2216d449 JL |
173 | } |
174 | } | |
175 | ||
6b189105 SM |
176 | static void |
177 | __nfsd4_create_reclaim_record_grace(struct nfs4_client *clp, | |
178 | const char *dname, int len, struct nfsd_net *nn) | |
179 | { | |
180 | struct xdr_netobj name; | |
6ee95d1c | 181 | struct xdr_netobj princhash = { .len = 0, .data = NULL }; |
6b189105 SM |
182 | struct nfs4_client_reclaim *crp; |
183 | ||
184 | name.data = kmemdup(dname, len, GFP_KERNEL); | |
185 | if (!name.data) { | |
186 | dprintk("%s: failed to allocate memory for name.data!\n", | |
187 | __func__); | |
188 | return; | |
189 | } | |
190 | name.len = len; | |
6ee95d1c | 191 | crp = nfs4_client_to_reclaim(name, princhash, nn); |
6b189105 SM |
192 | if (!crp) { |
193 | kfree(name.data); | |
194 | return; | |
195 | } | |
196 | crp->cr_clp = clp; | |
197 | } | |
198 | ||
2a4317c5 JL |
199 | static void |
200 | nfsd4_create_clid_dir(struct nfs4_client *clp) | |
c7b9a459 | 201 | { |
d84f4f99 | 202 | const struct cred *original_cred; |
2216d449 | 203 | char dname[HEXDIR_LEN]; |
e970a573 | 204 | struct dentry *dir, *dentry; |
c7b9a459 | 205 | int status; |
52e19c09 | 206 | struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); |
c7b9a459 | 207 | |
a52d726b | 208 | if (test_and_set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) |
7a6ef8c7 | 209 | return; |
3a073369 | 210 | if (!nn->rec_file) |
7a6ef8c7 | 211 | return; |
2216d449 JL |
212 | |
213 | status = nfs4_make_rec_clidname(dname, &clp->cl_name); | |
214 | if (status) | |
7255e716 | 215 | return legacy_recdir_name_error(clp, status); |
2216d449 | 216 | |
d84f4f99 DH |
217 | status = nfs4_save_creds(&original_cred); |
218 | if (status < 0) | |
7a6ef8c7 | 219 | return; |
c7b9a459 | 220 | |
3a073369 | 221 | status = mnt_want_write_file(nn->rec_file); |
4a55c101 | 222 | if (status) |
c2236f14 | 223 | goto out_creds; |
4a55c101 | 224 | |
3a073369 | 225 | dir = nn->rec_file->f_path.dentry; |
c7b9a459 | 226 | /* lock the parent */ |
5955102c | 227 | inode_lock(d_inode(dir)); |
c7b9a459 | 228 | |
e970a573 | 229 | dentry = lookup_one_len(dname, dir, HEXDIR_LEN-1); |
c7b9a459 N |
230 | if (IS_ERR(dentry)) { |
231 | status = PTR_ERR(dentry); | |
232 | goto out_unlock; | |
233 | } | |
2b0143b5 | 234 | if (d_really_is_positive(dentry)) |
aec39680 BF |
235 | /* |
236 | * In the 4.1 case, where we're called from | |
237 | * reclaim_complete(), records from the previous reboot | |
238 | * may still be left, so this is OK. | |
239 | * | |
240 | * In the 4.0 case, we should never get here; but we may | |
241 | * as well be forgiving and just succeed silently. | |
242 | */ | |
c7b9a459 | 243 | goto out_put; |
2b0143b5 | 244 | status = vfs_mkdir(d_inode(dir), dentry, S_IRWXU); |
c7b9a459 N |
245 | out_put: |
246 | dput(dentry); | |
247 | out_unlock: | |
5955102c | 248 | inode_unlock(d_inode(dir)); |
0ce0c2b5 | 249 | if (status == 0) { |
6b189105 SM |
250 | if (nn->in_grace) |
251 | __nfsd4_create_reclaim_record_grace(clp, dname, | |
252 | HEXDIR_LEN, nn); | |
3a073369 | 253 | vfs_fsync(nn->rec_file, 0); |
0ce0c2b5 | 254 | } else { |
6577aac0 BH |
255 | printk(KERN_ERR "NFSD: failed to write recovery record" |
256 | " (err %d); please check that %s exists" | |
257 | " and is writeable", status, | |
258 | user_recovery_dirname); | |
0ce0c2b5 | 259 | } |
3a073369 | 260 | mnt_drop_write_file(nn->rec_file); |
c2236f14 | 261 | out_creds: |
d84f4f99 | 262 | nfs4_reset_creds(original_cred); |
c7b9a459 N |
263 | } |
264 | ||
52e19c09 | 265 | typedef int (recdir_func)(struct dentry *, struct dentry *, struct nfsd_net *); |
190e4fbf | 266 | |
05f4f678 BF |
267 | struct name_list { |
268 | char name[HEXDIR_LEN]; | |
190e4fbf N |
269 | struct list_head list; |
270 | }; | |
271 | ||
bb6f619b AV |
272 | struct nfs4_dir_ctx { |
273 | struct dir_context ctx; | |
274 | struct list_head names; | |
275 | }; | |
276 | ||
190e4fbf | 277 | static int |
ac7576f4 | 278 | nfsd4_build_namelist(struct dir_context *__ctx, const char *name, int namlen, |
afefdbb2 | 279 | loff_t offset, u64 ino, unsigned int d_type) |
190e4fbf | 280 | { |
ac7576f4 MS |
281 | struct nfs4_dir_ctx *ctx = |
282 | container_of(__ctx, struct nfs4_dir_ctx, ctx); | |
05f4f678 | 283 | struct name_list *entry; |
190e4fbf | 284 | |
05f4f678 | 285 | if (namlen != HEXDIR_LEN - 1) |
b37ad28b | 286 | return 0; |
05f4f678 BF |
287 | entry = kmalloc(sizeof(struct name_list), GFP_KERNEL); |
288 | if (entry == NULL) | |
190e4fbf | 289 | return -ENOMEM; |
05f4f678 BF |
290 | memcpy(entry->name, name, HEXDIR_LEN - 1); |
291 | entry->name[HEXDIR_LEN - 1] = '\0'; | |
bb6f619b | 292 | list_add(&entry->list, &ctx->names); |
190e4fbf N |
293 | return 0; |
294 | } | |
295 | ||
296 | static int | |
52e19c09 | 297 | nfsd4_list_rec_dir(recdir_func *f, struct nfsd_net *nn) |
190e4fbf | 298 | { |
d84f4f99 | 299 | const struct cred *original_cred; |
3a073369 | 300 | struct dentry *dir = nn->rec_file->f_path.dentry; |
ac6614b7 AV |
301 | struct nfs4_dir_ctx ctx = { |
302 | .ctx.actor = nfsd4_build_namelist, | |
303 | .names = LIST_HEAD_INIT(ctx.names) | |
304 | }; | |
4691b271 | 305 | struct name_list *entry, *tmp; |
190e4fbf N |
306 | int status; |
307 | ||
d84f4f99 DH |
308 | status = nfs4_save_creds(&original_cred); |
309 | if (status < 0) | |
310 | return status; | |
190e4fbf | 311 | |
3a073369 | 312 | status = vfs_llseek(nn->rec_file, 0, SEEK_SET); |
5b4b299c AV |
313 | if (status < 0) { |
314 | nfs4_reset_creds(original_cred); | |
315 | return status; | |
316 | } | |
317 | ||
5c0ba4e0 | 318 | status = iterate_dir(nn->rec_file, &ctx.ctx); |
5955102c | 319 | inode_lock_nested(d_inode(dir), I_MUTEX_PARENT); |
4691b271 KM |
320 | |
321 | list_for_each_entry_safe(entry, tmp, &ctx.names, list) { | |
5b4b299c AV |
322 | if (!status) { |
323 | struct dentry *dentry; | |
324 | dentry = lookup_one_len(entry->name, dir, HEXDIR_LEN-1); | |
325 | if (IS_ERR(dentry)) { | |
326 | status = PTR_ERR(dentry); | |
327 | break; | |
328 | } | |
52e19c09 | 329 | status = f(dir, dentry, nn); |
5b4b299c | 330 | dput(dentry); |
05f4f678 | 331 | } |
05f4f678 BF |
332 | list_del(&entry->list); |
333 | kfree(entry); | |
190e4fbf | 334 | } |
5955102c | 335 | inode_unlock(d_inode(dir)); |
d84f4f99 | 336 | nfs4_reset_creds(original_cred); |
4691b271 KM |
337 | |
338 | list_for_each_entry_safe(entry, tmp, &ctx.names, list) { | |
339 | dprintk("NFSD: %s. Left entry %s\n", __func__, entry->name); | |
340 | list_del(&entry->list); | |
341 | kfree(entry); | |
342 | } | |
190e4fbf N |
343 | return status; |
344 | } | |
345 | ||
c7b9a459 | 346 | static int |
3a073369 | 347 | nfsd4_unlink_clid_dir(char *name, int namlen, struct nfsd_net *nn) |
c7b9a459 | 348 | { |
e970a573 | 349 | struct dentry *dir, *dentry; |
c7b9a459 N |
350 | int status; |
351 | ||
352 | dprintk("NFSD: nfsd4_unlink_clid_dir. name %.*s\n", namlen, name); | |
353 | ||
3a073369 | 354 | dir = nn->rec_file->f_path.dentry; |
5955102c | 355 | inode_lock_nested(d_inode(dir), I_MUTEX_PARENT); |
e970a573 | 356 | dentry = lookup_one_len(name, dir, namlen); |
c7b9a459 N |
357 | if (IS_ERR(dentry)) { |
358 | status = PTR_ERR(dentry); | |
2f9092e1 | 359 | goto out_unlock; |
c7b9a459 N |
360 | } |
361 | status = -ENOENT; | |
2b0143b5 | 362 | if (d_really_is_negative(dentry)) |
c7b9a459 | 363 | goto out; |
2b0143b5 | 364 | status = vfs_rmdir(d_inode(dir), dentry); |
c7b9a459 N |
365 | out: |
366 | dput(dentry); | |
2f9092e1 | 367 | out_unlock: |
5955102c | 368 | inode_unlock(d_inode(dir)); |
c7b9a459 N |
369 | return status; |
370 | } | |
371 | ||
6b189105 SM |
372 | static void |
373 | __nfsd4_remove_reclaim_record_grace(const char *dname, int len, | |
374 | struct nfsd_net *nn) | |
375 | { | |
376 | struct xdr_netobj name; | |
377 | struct nfs4_client_reclaim *crp; | |
378 | ||
379 | name.data = kmemdup(dname, len, GFP_KERNEL); | |
380 | if (!name.data) { | |
381 | dprintk("%s: failed to allocate memory for name.data!\n", | |
382 | __func__); | |
383 | return; | |
384 | } | |
385 | name.len = len; | |
386 | crp = nfsd4_find_reclaim_client(name, nn); | |
387 | kfree(name.data); | |
388 | if (crp) | |
389 | nfs4_remove_reclaim_record(crp, nn); | |
390 | } | |
391 | ||
2a4317c5 | 392 | static void |
c7b9a459 N |
393 | nfsd4_remove_clid_dir(struct nfs4_client *clp) |
394 | { | |
d84f4f99 | 395 | const struct cred *original_cred; |
2216d449 | 396 | char dname[HEXDIR_LEN]; |
c7b9a459 | 397 | int status; |
52e19c09 | 398 | struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); |
c7b9a459 | 399 | |
3a073369 | 400 | if (!nn->rec_file || !test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) |
c7b9a459 N |
401 | return; |
402 | ||
2216d449 JL |
403 | status = nfs4_make_rec_clidname(dname, &clp->cl_name); |
404 | if (status) | |
7255e716 | 405 | return legacy_recdir_name_error(clp, status); |
2216d449 | 406 | |
3a073369 | 407 | status = mnt_want_write_file(nn->rec_file); |
0622753b DH |
408 | if (status) |
409 | goto out; | |
a52d726b | 410 | clear_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags); |
d84f4f99 DH |
411 | |
412 | status = nfs4_save_creds(&original_cred); | |
413 | if (status < 0) | |
698d8d87 | 414 | goto out_drop_write; |
d84f4f99 | 415 | |
3a073369 | 416 | status = nfsd4_unlink_clid_dir(dname, HEXDIR_LEN-1, nn); |
d84f4f99 | 417 | nfs4_reset_creds(original_cred); |
0ce0c2b5 | 418 | if (status == 0) { |
3a073369 | 419 | vfs_fsync(nn->rec_file, 0); |
6b189105 SM |
420 | if (nn->in_grace) |
421 | __nfsd4_remove_reclaim_record_grace(dname, | |
422 | HEXDIR_LEN, nn); | |
0ce0c2b5 | 423 | } |
698d8d87 | 424 | out_drop_write: |
3a073369 | 425 | mnt_drop_write_file(nn->rec_file); |
0622753b | 426 | out: |
c7b9a459 N |
427 | if (status) |
428 | printk("NFSD: Failed to remove expired client state directory" | |
2216d449 | 429 | " %.*s\n", HEXDIR_LEN, dname); |
c7b9a459 N |
430 | } |
431 | ||
432 | static int | |
52e19c09 | 433 | purge_old(struct dentry *parent, struct dentry *child, struct nfsd_net *nn) |
c7b9a459 N |
434 | { |
435 | int status; | |
6b189105 | 436 | struct xdr_netobj name; |
c7b9a459 | 437 | |
6b189105 SM |
438 | if (child->d_name.len != HEXDIR_LEN - 1) { |
439 | printk("%s: illegal name %pd in recovery directory\n", | |
440 | __func__, child); | |
441 | /* Keep trying; maybe the others are OK: */ | |
b37ad28b | 442 | return 0; |
6b189105 SM |
443 | } |
444 | name.data = kmemdup_nul(child->d_name.name, child->d_name.len, GFP_KERNEL); | |
445 | if (!name.data) { | |
446 | dprintk("%s: failed to allocate memory for name.data!\n", | |
447 | __func__); | |
448 | goto out; | |
449 | } | |
450 | name.len = HEXDIR_LEN; | |
451 | if (nfs4_has_reclaimed_state(name, nn)) | |
452 | goto out_free; | |
c7b9a459 | 453 | |
2b0143b5 | 454 | status = vfs_rmdir(d_inode(parent), child); |
c7b9a459 | 455 | if (status) |
a6a9f18f AV |
456 | printk("failed to remove client recovery directory %pd\n", |
457 | child); | |
6b189105 SM |
458 | out_free: |
459 | kfree(name.data); | |
460 | out: | |
c7b9a459 | 461 | /* Keep trying, success or failure: */ |
b37ad28b | 462 | return 0; |
c7b9a459 N |
463 | } |
464 | ||
2a4317c5 | 465 | static void |
919b8049 | 466 | nfsd4_recdir_purge_old(struct nfsd_net *nn) |
2a4317c5 | 467 | { |
c7b9a459 N |
468 | int status; |
469 | ||
f141f79d | 470 | nn->in_grace = false; |
3a073369 | 471 | if (!nn->rec_file) |
c7b9a459 | 472 | return; |
3a073369 | 473 | status = mnt_want_write_file(nn->rec_file); |
0622753b DH |
474 | if (status) |
475 | goto out; | |
52e19c09 | 476 | status = nfsd4_list_rec_dir(purge_old, nn); |
c7b9a459 | 477 | if (status == 0) |
3a073369 SK |
478 | vfs_fsync(nn->rec_file, 0); |
479 | mnt_drop_write_file(nn->rec_file); | |
0622753b | 480 | out: |
52e19c09 | 481 | nfs4_release_reclaim(nn); |
c7b9a459 N |
482 | if (status) |
483 | printk("nfsd4: failed to purge old clients from recovery" | |
a6a9f18f | 484 | " directory %pD\n", nn->rec_file); |
c7b9a459 N |
485 | } |
486 | ||
190e4fbf | 487 | static int |
52e19c09 | 488 | load_recdir(struct dentry *parent, struct dentry *child, struct nfsd_net *nn) |
190e4fbf | 489 | { |
6b189105 | 490 | struct xdr_netobj name; |
6ee95d1c | 491 | struct xdr_netobj princhash = { .len = 0, .data = NULL }; |
6b189105 | 492 | |
190e4fbf | 493 | if (child->d_name.len != HEXDIR_LEN - 1) { |
6b189105 SM |
494 | printk("%s: illegal name %pd in recovery directory\n", |
495 | __func__, child); | |
190e4fbf | 496 | /* Keep trying; maybe the others are OK: */ |
b37ad28b | 497 | return 0; |
190e4fbf | 498 | } |
6b189105 SM |
499 | name.data = kmemdup_nul(child->d_name.name, child->d_name.len, GFP_KERNEL); |
500 | if (!name.data) { | |
501 | dprintk("%s: failed to allocate memory for name.data!\n", | |
502 | __func__); | |
503 | goto out; | |
504 | } | |
505 | name.len = HEXDIR_LEN; | |
6ee95d1c | 506 | if (!nfs4_client_to_reclaim(name, princhash, nn)) |
6b189105 SM |
507 | kfree(name.data); |
508 | out: | |
b37ad28b | 509 | return 0; |
190e4fbf N |
510 | } |
511 | ||
2a4317c5 | 512 | static int |
52e19c09 | 513 | nfsd4_recdir_load(struct net *net) { |
190e4fbf | 514 | int status; |
52e19c09 | 515 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
190e4fbf | 516 | |
3a073369 | 517 | if (!nn->rec_file) |
e970a573 CH |
518 | return 0; |
519 | ||
52e19c09 | 520 | status = nfsd4_list_rec_dir(load_recdir, nn); |
190e4fbf N |
521 | if (status) |
522 | printk("nfsd4: failed loading clients from recovery" | |
a6a9f18f | 523 | " directory %pD\n", nn->rec_file); |
190e4fbf N |
524 | return status; |
525 | } | |
526 | ||
527 | /* | |
528 | * Hold reference to the recovery directory. | |
529 | */ | |
530 | ||
2a4317c5 | 531 | static int |
3a073369 | 532 | nfsd4_init_recdir(struct net *net) |
190e4fbf | 533 | { |
3a073369 | 534 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
d84f4f99 DH |
535 | const struct cred *original_cred; |
536 | int status; | |
190e4fbf N |
537 | |
538 | printk("NFSD: Using %s as the NFSv4 state recovery directory\n", | |
48483bf2 | 539 | user_recovery_dirname); |
190e4fbf | 540 | |
3a073369 | 541 | BUG_ON(nn->rec_file); |
190e4fbf | 542 | |
d84f4f99 DH |
543 | status = nfs4_save_creds(&original_cred); |
544 | if (status < 0) { | |
545 | printk("NFSD: Unable to change credentials to find recovery" | |
546 | " directory: error %d\n", | |
547 | status); | |
2a4317c5 | 548 | return status; |
d84f4f99 | 549 | } |
190e4fbf | 550 | |
3a073369 SK |
551 | nn->rec_file = filp_open(user_recovery_dirname, O_RDONLY | O_DIRECTORY, 0); |
552 | if (IS_ERR(nn->rec_file)) { | |
c2642ab0 | 553 | printk("NFSD: unable to find recovery directory %s\n", |
48483bf2 | 554 | user_recovery_dirname); |
3a073369 SK |
555 | status = PTR_ERR(nn->rec_file); |
556 | nn->rec_file = NULL; | |
e970a573 | 557 | } |
190e4fbf | 558 | |
d84f4f99 | 559 | nfs4_reset_creds(original_cred); |
0ce0c2b5 | 560 | if (!status) |
f141f79d | 561 | nn->in_grace = true; |
2a4317c5 | 562 | return status; |
190e4fbf N |
563 | } |
564 | ||
15d176c1 KM |
565 | static void |
566 | nfsd4_shutdown_recdir(struct net *net) | |
567 | { | |
568 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); | |
569 | ||
570 | if (!nn->rec_file) | |
571 | return; | |
572 | fput(nn->rec_file); | |
573 | nn->rec_file = NULL; | |
574 | } | |
52e19c09 SK |
575 | |
576 | static int | |
577 | nfs4_legacy_state_init(struct net *net) | |
578 | { | |
579 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); | |
580 | int i; | |
581 | ||
6da2ec56 KC |
582 | nn->reclaim_str_hashtbl = kmalloc_array(CLIENT_HASH_SIZE, |
583 | sizeof(struct list_head), | |
584 | GFP_KERNEL); | |
52e19c09 SK |
585 | if (!nn->reclaim_str_hashtbl) |
586 | return -ENOMEM; | |
587 | ||
588 | for (i = 0; i < CLIENT_HASH_SIZE; i++) | |
589 | INIT_LIST_HEAD(&nn->reclaim_str_hashtbl[i]); | |
590 | nn->reclaim_str_hashtbl_size = 0; | |
591 | ||
592 | return 0; | |
593 | } | |
594 | ||
595 | static void | |
596 | nfs4_legacy_state_shutdown(struct net *net) | |
597 | { | |
598 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); | |
599 | ||
600 | kfree(nn->reclaim_str_hashtbl); | |
601 | } | |
602 | ||
2a4317c5 JL |
603 | static int |
604 | nfsd4_load_reboot_recovery_data(struct net *net) | |
605 | { | |
606 | int status; | |
607 | ||
3a073369 | 608 | status = nfsd4_init_recdir(net); |
52e19c09 | 609 | if (status) |
15d176c1 KM |
610 | return status; |
611 | ||
612 | status = nfsd4_recdir_load(net); | |
613 | if (status) | |
614 | nfsd4_shutdown_recdir(net); | |
615 | ||
52e19c09 SK |
616 | return status; |
617 | } | |
618 | ||
619 | static int | |
620 | nfsd4_legacy_tracking_init(struct net *net) | |
621 | { | |
622 | int status; | |
623 | ||
cc27e0d4 JL |
624 | /* XXX: The legacy code won't work in a container */ |
625 | if (net != &init_net) { | |
46cc8ba3 | 626 | pr_warn("NFSD: attempt to initialize legacy client tracking in a container ignored.\n"); |
cc27e0d4 JL |
627 | return -EINVAL; |
628 | } | |
629 | ||
52e19c09 | 630 | status = nfs4_legacy_state_init(net); |
2a4317c5 | 631 | if (status) |
52e19c09 SK |
632 | return status; |
633 | ||
634 | status = nfsd4_load_reboot_recovery_data(net); | |
635 | if (status) | |
636 | goto err; | |
86921607 | 637 | printk("NFSD: Using legacy client tracking operations.\n"); |
52e19c09 SK |
638 | return 0; |
639 | ||
640 | err: | |
641 | nfs4_legacy_state_shutdown(net); | |
2a4317c5 JL |
642 | return status; |
643 | } | |
644 | ||
2a4317c5 JL |
645 | static void |
646 | nfsd4_legacy_tracking_exit(struct net *net) | |
647 | { | |
52e19c09 SK |
648 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
649 | ||
650 | nfs4_release_reclaim(nn); | |
15d176c1 | 651 | nfsd4_shutdown_recdir(net); |
52e19c09 | 652 | nfs4_legacy_state_shutdown(net); |
2a4317c5 JL |
653 | } |
654 | ||
48483bf2 BF |
655 | /* |
656 | * Change the NFSv4 recovery directory to recdir. | |
657 | */ | |
658 | int | |
659 | nfs4_reset_recoverydir(char *recdir) | |
660 | { | |
661 | int status; | |
662 | struct path path; | |
663 | ||
664 | status = kern_path(recdir, LOOKUP_FOLLOW, &path); | |
665 | if (status) | |
666 | return status; | |
667 | status = -ENOTDIR; | |
e36cb0b8 | 668 | if (d_is_dir(path.dentry)) { |
48483bf2 BF |
669 | strcpy(user_recovery_dirname, recdir); |
670 | status = 0; | |
671 | } | |
672 | path_put(&path); | |
673 | return status; | |
674 | } | |
675 | ||
676 | char * | |
677 | nfs4_recoverydir(void) | |
678 | { | |
679 | return user_recovery_dirname; | |
680 | } | |
2a4317c5 JL |
681 | |
682 | static int | |
683 | nfsd4_check_legacy_client(struct nfs4_client *clp) | |
684 | { | |
2216d449 JL |
685 | int status; |
686 | char dname[HEXDIR_LEN]; | |
0ce0c2b5 | 687 | struct nfs4_client_reclaim *crp; |
52e19c09 | 688 | struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); |
6b189105 | 689 | struct xdr_netobj name; |
0ce0c2b5 | 690 | |
2a4317c5 JL |
691 | /* did we already find that this client is stable? */ |
692 | if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) | |
693 | return 0; | |
694 | ||
2216d449 JL |
695 | status = nfs4_make_rec_clidname(dname, &clp->cl_name); |
696 | if (status) { | |
7255e716 | 697 | legacy_recdir_name_error(clp, status); |
2216d449 JL |
698 | return status; |
699 | } | |
700 | ||
2a4317c5 | 701 | /* look for it in the reclaim hashtable otherwise */ |
6b189105 SM |
702 | name.data = kmemdup(dname, HEXDIR_LEN, GFP_KERNEL); |
703 | if (!name.data) { | |
704 | dprintk("%s: failed to allocate memory for name.data!\n", | |
705 | __func__); | |
706 | goto out_enoent; | |
707 | } | |
708 | name.len = HEXDIR_LEN; | |
709 | crp = nfsd4_find_reclaim_client(name, nn); | |
710 | kfree(name.data); | |
0ce0c2b5 | 711 | if (crp) { |
2a4317c5 | 712 | set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags); |
0ce0c2b5 | 713 | crp->cr_clp = clp; |
2a4317c5 JL |
714 | return 0; |
715 | } | |
716 | ||
6b189105 | 717 | out_enoent: |
2a4317c5 JL |
718 | return -ENOENT; |
719 | } | |
720 | ||
7c582e4f | 721 | static const struct nfsd4_client_tracking_ops nfsd4_legacy_tracking_ops = { |
52e19c09 | 722 | .init = nfsd4_legacy_tracking_init, |
2a4317c5 JL |
723 | .exit = nfsd4_legacy_tracking_exit, |
724 | .create = nfsd4_create_clid_dir, | |
725 | .remove = nfsd4_remove_clid_dir, | |
726 | .check = nfsd4_check_legacy_client, | |
727 | .grace_done = nfsd4_recdir_purge_old, | |
11a60d15 SM |
728 | .version = 1, |
729 | .msglen = 0, | |
2a4317c5 JL |
730 | }; |
731 | ||
f3f80148 JL |
732 | /* Globals */ |
733 | #define NFSD_PIPE_DIR "nfsd" | |
734 | #define NFSD_CLD_PIPE "cld" | |
735 | ||
736 | /* per-net-ns structure for holding cld upcall info */ | |
737 | struct cld_net { | |
738 | struct rpc_pipe *cn_pipe; | |
739 | spinlock_t cn_lock; | |
740 | struct list_head cn_list; | |
741 | unsigned int cn_xid; | |
8a9f4f41 | 742 | bool cn_has_legacy; |
6ee95d1c | 743 | struct crypto_shash *cn_tfm; |
f3f80148 JL |
744 | }; |
745 | ||
746 | struct cld_upcall { | |
747 | struct list_head cu_list; | |
748 | struct cld_net *cu_net; | |
b493fd31 | 749 | struct completion cu_done; |
11a60d15 SM |
750 | union { |
751 | struct cld_msg_hdr cu_hdr; | |
752 | struct cld_msg cu_msg; | |
6ee95d1c | 753 | struct cld_msg_v2 cu_msg_v2; |
11a60d15 | 754 | } cu_u; |
f3f80148 JL |
755 | }; |
756 | ||
757 | static int | |
11a60d15 | 758 | __cld_pipe_upcall(struct rpc_pipe *pipe, void *cmsg) |
f3f80148 JL |
759 | { |
760 | int ret; | |
761 | struct rpc_pipe_msg msg; | |
11a60d15 SM |
762 | struct cld_upcall *cup = container_of(cmsg, struct cld_upcall, cu_u); |
763 | struct nfsd_net *nn = net_generic(pipe->dentry->d_sb->s_fs_info, | |
764 | nfsd_net_id); | |
f3f80148 JL |
765 | |
766 | memset(&msg, 0, sizeof(msg)); | |
767 | msg.data = cmsg; | |
11a60d15 | 768 | msg.len = nn->client_tracking_ops->msglen; |
f3f80148 | 769 | |
f3f80148 JL |
770 | ret = rpc_queue_upcall(pipe, &msg); |
771 | if (ret < 0) { | |
f3f80148 JL |
772 | goto out; |
773 | } | |
774 | ||
b493fd31 | 775 | wait_for_completion(&cup->cu_done); |
f3f80148 JL |
776 | |
777 | if (msg.errno < 0) | |
778 | ret = msg.errno; | |
779 | out: | |
780 | return ret; | |
781 | } | |
782 | ||
783 | static int | |
11a60d15 | 784 | cld_pipe_upcall(struct rpc_pipe *pipe, void *cmsg) |
f3f80148 JL |
785 | { |
786 | int ret; | |
787 | ||
788 | /* | |
789 | * -EAGAIN occurs when pipe is closed and reopened while there are | |
790 | * upcalls queued. | |
791 | */ | |
792 | do { | |
793 | ret = __cld_pipe_upcall(pipe, cmsg); | |
794 | } while (ret == -EAGAIN); | |
795 | ||
796 | return ret; | |
797 | } | |
798 | ||
74725959 | 799 | static ssize_t |
6ee95d1c | 800 | __cld_pipe_inprogress_downcall(const struct cld_msg_v2 __user *cmsg, |
74725959 SM |
801 | struct nfsd_net *nn) |
802 | { | |
6ee95d1c SM |
803 | uint8_t cmd, princhashlen; |
804 | struct xdr_netobj name, princhash = { .len = 0, .data = NULL }; | |
74725959 | 805 | uint16_t namelen; |
8a9f4f41 | 806 | struct cld_net *cn = nn->cld_net; |
74725959 SM |
807 | |
808 | if (get_user(cmd, &cmsg->cm_cmd)) { | |
809 | dprintk("%s: error when copying cmd from userspace", __func__); | |
810 | return -EFAULT; | |
811 | } | |
812 | if (cmd == Cld_GraceStart) { | |
6ee95d1c SM |
813 | if (nn->client_tracking_ops->version >= 2) { |
814 | const struct cld_clntinfo __user *ci; | |
815 | ||
816 | ci = &cmsg->cm_u.cm_clntinfo; | |
817 | if (get_user(namelen, &ci->cc_name.cn_len)) | |
818 | return -EFAULT; | |
819 | name.data = memdup_user(&ci->cc_name.cn_id, namelen); | |
820 | if (IS_ERR_OR_NULL(name.data)) | |
821 | return -EFAULT; | |
822 | name.len = namelen; | |
823 | get_user(princhashlen, &ci->cc_princhash.cp_len); | |
824 | if (princhashlen > 0) { | |
825 | princhash.data = memdup_user( | |
826 | &ci->cc_princhash.cp_data, | |
827 | princhashlen); | |
828 | if (IS_ERR_OR_NULL(princhash.data)) | |
829 | return -EFAULT; | |
830 | princhash.len = princhashlen; | |
831 | } else | |
832 | princhash.len = 0; | |
833 | } else { | |
834 | const struct cld_name __user *cnm; | |
835 | ||
836 | cnm = &cmsg->cm_u.cm_name; | |
837 | if (get_user(namelen, &cnm->cn_len)) | |
838 | return -EFAULT; | |
839 | name.data = memdup_user(&cnm->cn_id, namelen); | |
840 | if (IS_ERR_OR_NULL(name.data)) | |
841 | return -EFAULT; | |
842 | name.len = namelen; | |
843 | } | |
8a9f4f41 SM |
844 | if (name.len > 5 && memcmp(name.data, "hash:", 5) == 0) { |
845 | name.len = name.len - 5; | |
846 | memmove(name.data, name.data + 5, name.len); | |
847 | cn->cn_has_legacy = true; | |
848 | } | |
6ee95d1c | 849 | if (!nfs4_client_to_reclaim(name, princhash, nn)) { |
74725959 | 850 | kfree(name.data); |
6ee95d1c | 851 | kfree(princhash.data); |
74725959 SM |
852 | return -EFAULT; |
853 | } | |
11a60d15 | 854 | return nn->client_tracking_ops->msglen; |
74725959 SM |
855 | } |
856 | return -EFAULT; | |
857 | } | |
858 | ||
f3f80148 JL |
859 | static ssize_t |
860 | cld_pipe_downcall(struct file *filp, const char __user *src, size_t mlen) | |
861 | { | |
862 | struct cld_upcall *tmp, *cup; | |
11a60d15 | 863 | struct cld_msg_hdr __user *hdr = (struct cld_msg_hdr __user *)src; |
6ee95d1c | 864 | struct cld_msg_v2 __user *cmsg = (struct cld_msg_v2 __user *)src; |
f3f80148 | 865 | uint32_t xid; |
ef8a1a10 | 866 | struct nfsd_net *nn = net_generic(file_inode(filp)->i_sb->s_fs_info, |
f3f80148 JL |
867 | nfsd_net_id); |
868 | struct cld_net *cn = nn->cld_net; | |
74725959 | 869 | int16_t status; |
f3f80148 | 870 | |
11a60d15 | 871 | if (mlen != nn->client_tracking_ops->msglen) { |
8a7dc4b0 | 872 | dprintk("%s: got %zu bytes, expected %zu\n", __func__, mlen, |
11a60d15 | 873 | nn->client_tracking_ops->msglen); |
f3f80148 JL |
874 | return -EINVAL; |
875 | } | |
876 | ||
877 | /* copy just the xid so we can try to find that */ | |
11a60d15 | 878 | if (copy_from_user(&xid, &hdr->cm_xid, sizeof(xid)) != 0) { |
f3f80148 JL |
879 | dprintk("%s: error when copying xid from userspace", __func__); |
880 | return -EFAULT; | |
881 | } | |
882 | ||
74725959 SM |
883 | /* |
884 | * copy the status so we know whether to remove the upcall from the | |
885 | * list (for -EINPROGRESS, we just want to make sure the xid is | |
886 | * valid, not remove the upcall from the list) | |
887 | */ | |
11a60d15 | 888 | if (get_user(status, &hdr->cm_status)) { |
74725959 SM |
889 | dprintk("%s: error when copying status from userspace", __func__); |
890 | return -EFAULT; | |
891 | } | |
892 | ||
f3f80148 JL |
893 | /* walk the list and find corresponding xid */ |
894 | cup = NULL; | |
895 | spin_lock(&cn->cn_lock); | |
896 | list_for_each_entry(tmp, &cn->cn_list, cu_list) { | |
11a60d15 | 897 | if (get_unaligned(&tmp->cu_u.cu_hdr.cm_xid) == xid) { |
f3f80148 | 898 | cup = tmp; |
74725959 SM |
899 | if (status != -EINPROGRESS) |
900 | list_del_init(&cup->cu_list); | |
f3f80148 JL |
901 | break; |
902 | } | |
903 | } | |
904 | spin_unlock(&cn->cn_lock); | |
905 | ||
906 | /* couldn't find upcall? */ | |
907 | if (!cup) { | |
21f72c9f | 908 | dprintk("%s: couldn't find upcall -- xid=%u\n", __func__, xid); |
f3f80148 JL |
909 | return -EINVAL; |
910 | } | |
911 | ||
74725959 SM |
912 | if (status == -EINPROGRESS) |
913 | return __cld_pipe_inprogress_downcall(cmsg, nn); | |
914 | ||
6ee95d1c | 915 | if (copy_from_user(&cup->cu_u.cu_msg_v2, src, mlen) != 0) |
f3f80148 JL |
916 | return -EFAULT; |
917 | ||
b493fd31 | 918 | complete(&cup->cu_done); |
f3f80148 JL |
919 | return mlen; |
920 | } | |
921 | ||
922 | static void | |
923 | cld_pipe_destroy_msg(struct rpc_pipe_msg *msg) | |
924 | { | |
925 | struct cld_msg *cmsg = msg->data; | |
926 | struct cld_upcall *cup = container_of(cmsg, struct cld_upcall, | |
11a60d15 | 927 | cu_u.cu_msg); |
f3f80148 JL |
928 | |
929 | /* errno >= 0 means we got a downcall */ | |
930 | if (msg->errno >= 0) | |
931 | return; | |
932 | ||
b493fd31 | 933 | complete(&cup->cu_done); |
f3f80148 JL |
934 | } |
935 | ||
936 | static const struct rpc_pipe_ops cld_upcall_ops = { | |
937 | .upcall = rpc_pipe_generic_upcall, | |
938 | .downcall = cld_pipe_downcall, | |
939 | .destroy_msg = cld_pipe_destroy_msg, | |
940 | }; | |
941 | ||
942 | static struct dentry * | |
943 | nfsd4_cld_register_sb(struct super_block *sb, struct rpc_pipe *pipe) | |
944 | { | |
945 | struct dentry *dir, *dentry; | |
946 | ||
947 | dir = rpc_d_lookup_sb(sb, NFSD_PIPE_DIR); | |
948 | if (dir == NULL) | |
949 | return ERR_PTR(-ENOENT); | |
950 | dentry = rpc_mkpipe_dentry(dir, NFSD_CLD_PIPE, NULL, pipe); | |
951 | dput(dir); | |
952 | return dentry; | |
953 | } | |
954 | ||
955 | static void | |
956 | nfsd4_cld_unregister_sb(struct rpc_pipe *pipe) | |
957 | { | |
958 | if (pipe->dentry) | |
959 | rpc_unlink(pipe->dentry); | |
960 | } | |
961 | ||
962 | static struct dentry * | |
963 | nfsd4_cld_register_net(struct net *net, struct rpc_pipe *pipe) | |
964 | { | |
965 | struct super_block *sb; | |
966 | struct dentry *dentry; | |
967 | ||
968 | sb = rpc_get_sb_net(net); | |
969 | if (!sb) | |
970 | return NULL; | |
971 | dentry = nfsd4_cld_register_sb(sb, pipe); | |
972 | rpc_put_sb_net(net); | |
973 | return dentry; | |
974 | } | |
975 | ||
976 | static void | |
977 | nfsd4_cld_unregister_net(struct net *net, struct rpc_pipe *pipe) | |
978 | { | |
979 | struct super_block *sb; | |
980 | ||
981 | sb = rpc_get_sb_net(net); | |
982 | if (sb) { | |
983 | nfsd4_cld_unregister_sb(pipe); | |
984 | rpc_put_sb_net(net); | |
985 | } | |
986 | } | |
987 | ||
988 | /* Initialize rpc_pipefs pipe for communication with client tracking daemon */ | |
989 | static int | |
86921607 | 990 | __nfsd4_init_cld_pipe(struct net *net) |
f3f80148 JL |
991 | { |
992 | int ret; | |
993 | struct dentry *dentry; | |
994 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); | |
995 | struct cld_net *cn; | |
996 | ||
997 | if (nn->cld_net) | |
998 | return 0; | |
999 | ||
1000 | cn = kzalloc(sizeof(*cn), GFP_KERNEL); | |
1001 | if (!cn) { | |
1002 | ret = -ENOMEM; | |
1003 | goto err; | |
1004 | } | |
1005 | ||
1006 | cn->cn_pipe = rpc_mkpipe_data(&cld_upcall_ops, RPC_PIPE_WAIT_FOR_OPEN); | |
1007 | if (IS_ERR(cn->cn_pipe)) { | |
1008 | ret = PTR_ERR(cn->cn_pipe); | |
1009 | goto err; | |
1010 | } | |
1011 | spin_lock_init(&cn->cn_lock); | |
1012 | INIT_LIST_HEAD(&cn->cn_list); | |
1013 | ||
1014 | dentry = nfsd4_cld_register_net(net, cn->cn_pipe); | |
1015 | if (IS_ERR(dentry)) { | |
1016 | ret = PTR_ERR(dentry); | |
1017 | goto err_destroy_data; | |
1018 | } | |
1019 | ||
1020 | cn->cn_pipe->dentry = dentry; | |
8a9f4f41 | 1021 | cn->cn_has_legacy = false; |
f3f80148 JL |
1022 | nn->cld_net = cn; |
1023 | return 0; | |
1024 | ||
1025 | err_destroy_data: | |
1026 | rpc_destroy_pipe_data(cn->cn_pipe); | |
1027 | err: | |
1028 | kfree(cn); | |
1029 | printk(KERN_ERR "NFSD: unable to create nfsdcld upcall pipe (%d)\n", | |
1030 | ret); | |
1031 | return ret; | |
1032 | } | |
1033 | ||
86921607 SM |
1034 | static int |
1035 | nfsd4_init_cld_pipe(struct net *net) | |
1036 | { | |
1037 | int status; | |
1038 | ||
1039 | status = __nfsd4_init_cld_pipe(net); | |
1040 | if (!status) | |
1041 | printk("NFSD: Using old nfsdcld client tracking operations.\n"); | |
1042 | return status; | |
1043 | } | |
1044 | ||
f3f80148 JL |
1045 | static void |
1046 | nfsd4_remove_cld_pipe(struct net *net) | |
1047 | { | |
1048 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); | |
1049 | struct cld_net *cn = nn->cld_net; | |
1050 | ||
1051 | nfsd4_cld_unregister_net(net, cn->cn_pipe); | |
1052 | rpc_destroy_pipe_data(cn->cn_pipe); | |
6ee95d1c SM |
1053 | if (cn->cn_tfm) |
1054 | crypto_free_shash(cn->cn_tfm); | |
f3f80148 JL |
1055 | kfree(nn->cld_net); |
1056 | nn->cld_net = NULL; | |
1057 | } | |
1058 | ||
1059 | static struct cld_upcall * | |
11a60d15 | 1060 | alloc_cld_upcall(struct nfsd_net *nn) |
f3f80148 JL |
1061 | { |
1062 | struct cld_upcall *new, *tmp; | |
11a60d15 | 1063 | struct cld_net *cn = nn->cld_net; |
f3f80148 JL |
1064 | |
1065 | new = kzalloc(sizeof(*new), GFP_KERNEL); | |
1066 | if (!new) | |
1067 | return new; | |
1068 | ||
1069 | /* FIXME: hard cap on number in flight? */ | |
1070 | restart_search: | |
1071 | spin_lock(&cn->cn_lock); | |
1072 | list_for_each_entry(tmp, &cn->cn_list, cu_list) { | |
11a60d15 | 1073 | if (tmp->cu_u.cu_msg.cm_xid == cn->cn_xid) { |
f3f80148 JL |
1074 | cn->cn_xid++; |
1075 | spin_unlock(&cn->cn_lock); | |
1076 | goto restart_search; | |
1077 | } | |
1078 | } | |
b493fd31 | 1079 | init_completion(&new->cu_done); |
11a60d15 SM |
1080 | new->cu_u.cu_msg.cm_vers = nn->client_tracking_ops->version; |
1081 | put_unaligned(cn->cn_xid++, &new->cu_u.cu_msg.cm_xid); | |
f3f80148 JL |
1082 | new->cu_net = cn; |
1083 | list_add(&new->cu_list, &cn->cn_list); | |
1084 | spin_unlock(&cn->cn_lock); | |
1085 | ||
11a60d15 | 1086 | dprintk("%s: allocated xid %u\n", __func__, new->cu_u.cu_msg.cm_xid); |
f3f80148 JL |
1087 | |
1088 | return new; | |
1089 | } | |
1090 | ||
1091 | static void | |
1092 | free_cld_upcall(struct cld_upcall *victim) | |
1093 | { | |
1094 | struct cld_net *cn = victim->cu_net; | |
1095 | ||
1096 | spin_lock(&cn->cn_lock); | |
1097 | list_del(&victim->cu_list); | |
1098 | spin_unlock(&cn->cn_lock); | |
1099 | kfree(victim); | |
1100 | } | |
1101 | ||
1102 | /* Ask daemon to create a new record */ | |
1103 | static void | |
1104 | nfsd4_cld_create(struct nfs4_client *clp) | |
1105 | { | |
1106 | int ret; | |
1107 | struct cld_upcall *cup; | |
c212cecf | 1108 | struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); |
f3f80148 JL |
1109 | struct cld_net *cn = nn->cld_net; |
1110 | ||
1111 | /* Don't upcall if it's already stored */ | |
1112 | if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) | |
1113 | return; | |
1114 | ||
11a60d15 | 1115 | cup = alloc_cld_upcall(nn); |
f3f80148 JL |
1116 | if (!cup) { |
1117 | ret = -ENOMEM; | |
1118 | goto out_err; | |
1119 | } | |
1120 | ||
11a60d15 SM |
1121 | cup->cu_u.cu_msg.cm_cmd = Cld_Create; |
1122 | cup->cu_u.cu_msg.cm_u.cm_name.cn_len = clp->cl_name.len; | |
1123 | memcpy(cup->cu_u.cu_msg.cm_u.cm_name.cn_id, clp->cl_name.data, | |
f3f80148 JL |
1124 | clp->cl_name.len); |
1125 | ||
11a60d15 | 1126 | ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_u.cu_msg); |
f3f80148 | 1127 | if (!ret) { |
11a60d15 | 1128 | ret = cup->cu_u.cu_msg.cm_status; |
f3f80148 JL |
1129 | set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags); |
1130 | } | |
1131 | ||
1132 | free_cld_upcall(cup); | |
1133 | out_err: | |
1134 | if (ret) | |
1135 | printk(KERN_ERR "NFSD: Unable to create client " | |
1136 | "record on stable storage: %d\n", ret); | |
1137 | } | |
1138 | ||
6ee95d1c SM |
1139 | /* Ask daemon to create a new record */ |
1140 | static void | |
1141 | nfsd4_cld_create_v2(struct nfs4_client *clp) | |
1142 | { | |
1143 | int ret; | |
1144 | struct cld_upcall *cup; | |
1145 | struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); | |
1146 | struct cld_net *cn = nn->cld_net; | |
1147 | struct cld_msg_v2 *cmsg; | |
1148 | struct crypto_shash *tfm = cn->cn_tfm; | |
1149 | struct xdr_netobj cksum; | |
1150 | char *principal = NULL; | |
1151 | SHASH_DESC_ON_STACK(desc, tfm); | |
1152 | ||
1153 | /* Don't upcall if it's already stored */ | |
1154 | if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) | |
1155 | return; | |
1156 | ||
1157 | cup = alloc_cld_upcall(nn); | |
1158 | if (!cup) { | |
1159 | ret = -ENOMEM; | |
1160 | goto out_err; | |
1161 | } | |
1162 | ||
1163 | cmsg = &cup->cu_u.cu_msg_v2; | |
1164 | cmsg->cm_cmd = Cld_Create; | |
1165 | cmsg->cm_u.cm_clntinfo.cc_name.cn_len = clp->cl_name.len; | |
1166 | memcpy(cmsg->cm_u.cm_clntinfo.cc_name.cn_id, clp->cl_name.data, | |
1167 | clp->cl_name.len); | |
1168 | if (clp->cl_cred.cr_raw_principal) | |
1169 | principal = clp->cl_cred.cr_raw_principal; | |
1170 | else if (clp->cl_cred.cr_principal) | |
1171 | principal = clp->cl_cred.cr_principal; | |
1172 | if (principal) { | |
1173 | desc->tfm = tfm; | |
1174 | cksum.len = crypto_shash_digestsize(tfm); | |
1175 | cksum.data = kmalloc(cksum.len, GFP_KERNEL); | |
1176 | if (cksum.data == NULL) { | |
1177 | ret = -ENOMEM; | |
1178 | goto out; | |
1179 | } | |
1180 | ret = crypto_shash_digest(desc, principal, strlen(principal), | |
1181 | cksum.data); | |
1182 | shash_desc_zero(desc); | |
1183 | if (ret) { | |
1184 | kfree(cksum.data); | |
1185 | goto out; | |
1186 | } | |
1187 | cmsg->cm_u.cm_clntinfo.cc_princhash.cp_len = cksum.len; | |
1188 | memcpy(cmsg->cm_u.cm_clntinfo.cc_princhash.cp_data, | |
1189 | cksum.data, cksum.len); | |
1190 | kfree(cksum.data); | |
1191 | } else | |
1192 | cmsg->cm_u.cm_clntinfo.cc_princhash.cp_len = 0; | |
1193 | ||
1194 | ret = cld_pipe_upcall(cn->cn_pipe, cmsg); | |
1195 | if (!ret) { | |
1196 | ret = cmsg->cm_status; | |
1197 | set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags); | |
1198 | } | |
1199 | ||
1200 | out: | |
1201 | free_cld_upcall(cup); | |
1202 | out_err: | |
1203 | if (ret) | |
1204 | pr_err("NFSD: Unable to create client record on stable storage: %d\n", | |
1205 | ret); | |
1206 | } | |
1207 | ||
f3f80148 JL |
1208 | /* Ask daemon to create a new record */ |
1209 | static void | |
1210 | nfsd4_cld_remove(struct nfs4_client *clp) | |
1211 | { | |
1212 | int ret; | |
1213 | struct cld_upcall *cup; | |
c212cecf | 1214 | struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); |
f3f80148 JL |
1215 | struct cld_net *cn = nn->cld_net; |
1216 | ||
1217 | /* Don't upcall if it's already removed */ | |
1218 | if (!test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) | |
1219 | return; | |
1220 | ||
11a60d15 | 1221 | cup = alloc_cld_upcall(nn); |
f3f80148 JL |
1222 | if (!cup) { |
1223 | ret = -ENOMEM; | |
1224 | goto out_err; | |
1225 | } | |
1226 | ||
11a60d15 SM |
1227 | cup->cu_u.cu_msg.cm_cmd = Cld_Remove; |
1228 | cup->cu_u.cu_msg.cm_u.cm_name.cn_len = clp->cl_name.len; | |
1229 | memcpy(cup->cu_u.cu_msg.cm_u.cm_name.cn_id, clp->cl_name.data, | |
f3f80148 JL |
1230 | clp->cl_name.len); |
1231 | ||
11a60d15 | 1232 | ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_u.cu_msg); |
f3f80148 | 1233 | if (!ret) { |
11a60d15 | 1234 | ret = cup->cu_u.cu_msg.cm_status; |
f3f80148 JL |
1235 | clear_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags); |
1236 | } | |
1237 | ||
1238 | free_cld_upcall(cup); | |
1239 | out_err: | |
1240 | if (ret) | |
1241 | printk(KERN_ERR "NFSD: Unable to remove client " | |
1242 | "record from stable storage: %d\n", ret); | |
1243 | } | |
1244 | ||
74725959 SM |
1245 | /* |
1246 | * For older nfsdcld's that do not allow us to "slurp" the clients | |
1247 | * from the tracking database during startup. | |
1248 | * | |
1249 | * Check for presence of a record, and update its timestamp | |
1250 | */ | |
f3f80148 | 1251 | static int |
74725959 | 1252 | nfsd4_cld_check_v0(struct nfs4_client *clp) |
f3f80148 JL |
1253 | { |
1254 | int ret; | |
1255 | struct cld_upcall *cup; | |
c212cecf | 1256 | struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); |
f3f80148 JL |
1257 | struct cld_net *cn = nn->cld_net; |
1258 | ||
1259 | /* Don't upcall if one was already stored during this grace pd */ | |
1260 | if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) | |
1261 | return 0; | |
1262 | ||
11a60d15 | 1263 | cup = alloc_cld_upcall(nn); |
f3f80148 JL |
1264 | if (!cup) { |
1265 | printk(KERN_ERR "NFSD: Unable to check client record on " | |
1266 | "stable storage: %d\n", -ENOMEM); | |
1267 | return -ENOMEM; | |
1268 | } | |
1269 | ||
11a60d15 SM |
1270 | cup->cu_u.cu_msg.cm_cmd = Cld_Check; |
1271 | cup->cu_u.cu_msg.cm_u.cm_name.cn_len = clp->cl_name.len; | |
1272 | memcpy(cup->cu_u.cu_msg.cm_u.cm_name.cn_id, clp->cl_name.data, | |
f3f80148 JL |
1273 | clp->cl_name.len); |
1274 | ||
11a60d15 | 1275 | ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_u.cu_msg); |
f3f80148 | 1276 | if (!ret) { |
11a60d15 | 1277 | ret = cup->cu_u.cu_msg.cm_status; |
f3f80148 JL |
1278 | set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags); |
1279 | } | |
1280 | ||
1281 | free_cld_upcall(cup); | |
1282 | return ret; | |
1283 | } | |
1284 | ||
74725959 SM |
1285 | /* |
1286 | * For newer nfsdcld's that allow us to "slurp" the clients | |
1287 | * from the tracking database during startup. | |
1288 | * | |
1289 | * Check for presence of a record in the reclaim_str_hashtbl | |
1290 | */ | |
1291 | static int | |
1292 | nfsd4_cld_check(struct nfs4_client *clp) | |
1293 | { | |
1294 | struct nfs4_client_reclaim *crp; | |
1295 | struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); | |
8a9f4f41 SM |
1296 | struct cld_net *cn = nn->cld_net; |
1297 | int status; | |
1298 | char dname[HEXDIR_LEN]; | |
1299 | struct xdr_netobj name; | |
74725959 SM |
1300 | |
1301 | /* did we already find that this client is stable? */ | |
1302 | if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) | |
1303 | return 0; | |
1304 | ||
1305 | /* look for it in the reclaim hashtable otherwise */ | |
1306 | crp = nfsd4_find_reclaim_client(clp->cl_name, nn); | |
8a9f4f41 SM |
1307 | if (crp) |
1308 | goto found; | |
1309 | ||
1310 | if (cn->cn_has_legacy) { | |
1311 | status = nfs4_make_rec_clidname(dname, &clp->cl_name); | |
1312 | if (status) | |
1313 | return -ENOENT; | |
1314 | ||
1315 | name.data = kmemdup(dname, HEXDIR_LEN, GFP_KERNEL); | |
1316 | if (!name.data) { | |
1317 | dprintk("%s: failed to allocate memory for name.data!\n", | |
1318 | __func__); | |
1319 | return -ENOENT; | |
1320 | } | |
1321 | name.len = HEXDIR_LEN; | |
1322 | crp = nfsd4_find_reclaim_client(name, nn); | |
1323 | kfree(name.data); | |
1324 | if (crp) | |
1325 | goto found; | |
74725959 | 1326 | |
8a9f4f41 | 1327 | } |
74725959 | 1328 | return -ENOENT; |
8a9f4f41 SM |
1329 | found: |
1330 | crp->cr_clp = clp; | |
1331 | return 0; | |
74725959 SM |
1332 | } |
1333 | ||
6ee95d1c SM |
1334 | static int |
1335 | nfsd4_cld_check_v2(struct nfs4_client *clp) | |
1336 | { | |
1337 | struct nfs4_client_reclaim *crp; | |
1338 | struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); | |
1339 | struct cld_net *cn = nn->cld_net; | |
1340 | int status; | |
1341 | char dname[HEXDIR_LEN]; | |
1342 | struct xdr_netobj name; | |
1343 | struct crypto_shash *tfm = cn->cn_tfm; | |
1344 | struct xdr_netobj cksum; | |
1345 | char *principal = NULL; | |
1346 | SHASH_DESC_ON_STACK(desc, tfm); | |
1347 | ||
1348 | /* did we already find that this client is stable? */ | |
1349 | if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) | |
1350 | return 0; | |
1351 | ||
1352 | /* look for it in the reclaim hashtable otherwise */ | |
1353 | crp = nfsd4_find_reclaim_client(clp->cl_name, nn); | |
1354 | if (crp) | |
1355 | goto found; | |
1356 | ||
1357 | if (cn->cn_has_legacy) { | |
1358 | status = nfs4_make_rec_clidname(dname, &clp->cl_name); | |
1359 | if (status) | |
1360 | return -ENOENT; | |
1361 | ||
1362 | name.data = kmemdup(dname, HEXDIR_LEN, GFP_KERNEL); | |
1363 | if (!name.data) { | |
1364 | dprintk("%s: failed to allocate memory for name.data\n", | |
1365 | __func__); | |
1366 | return -ENOENT; | |
1367 | } | |
1368 | name.len = HEXDIR_LEN; | |
1369 | crp = nfsd4_find_reclaim_client(name, nn); | |
1370 | kfree(name.data); | |
1371 | if (crp) | |
1372 | goto found; | |
1373 | ||
1374 | } | |
1375 | return -ENOENT; | |
1376 | found: | |
1377 | if (crp->cr_princhash.len) { | |
1378 | if (clp->cl_cred.cr_raw_principal) | |
1379 | principal = clp->cl_cred.cr_raw_principal; | |
1380 | else if (clp->cl_cred.cr_principal) | |
1381 | principal = clp->cl_cred.cr_principal; | |
1382 | if (principal == NULL) | |
1383 | return -ENOENT; | |
1384 | desc->tfm = tfm; | |
1385 | cksum.len = crypto_shash_digestsize(tfm); | |
1386 | cksum.data = kmalloc(cksum.len, GFP_KERNEL); | |
1387 | if (cksum.data == NULL) | |
1388 | return -ENOENT; | |
1389 | status = crypto_shash_digest(desc, principal, strlen(principal), | |
1390 | cksum.data); | |
1391 | shash_desc_zero(desc); | |
1392 | if (status) { | |
1393 | kfree(cksum.data); | |
1394 | return -ENOENT; | |
1395 | } | |
1396 | if (memcmp(crp->cr_princhash.data, cksum.data, | |
1397 | crp->cr_princhash.len)) { | |
1398 | kfree(cksum.data); | |
1399 | return -ENOENT; | |
1400 | } | |
1401 | kfree(cksum.data); | |
1402 | } | |
1403 | crp->cr_clp = clp; | |
1404 | return 0; | |
1405 | } | |
1406 | ||
74725959 SM |
1407 | static int |
1408 | nfsd4_cld_grace_start(struct nfsd_net *nn) | |
1409 | { | |
1410 | int ret; | |
1411 | struct cld_upcall *cup; | |
1412 | struct cld_net *cn = nn->cld_net; | |
1413 | ||
11a60d15 | 1414 | cup = alloc_cld_upcall(nn); |
74725959 SM |
1415 | if (!cup) { |
1416 | ret = -ENOMEM; | |
1417 | goto out_err; | |
1418 | } | |
1419 | ||
11a60d15 SM |
1420 | cup->cu_u.cu_msg.cm_cmd = Cld_GraceStart; |
1421 | ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_u.cu_msg); | |
74725959 | 1422 | if (!ret) |
11a60d15 | 1423 | ret = cup->cu_u.cu_msg.cm_status; |
74725959 SM |
1424 | |
1425 | free_cld_upcall(cup); | |
1426 | out_err: | |
1427 | if (ret) | |
1428 | dprintk("%s: Unable to get clients from userspace: %d\n", | |
1429 | __func__, ret); | |
1430 | return ret; | |
1431 | } | |
1432 | ||
1433 | /* For older nfsdcld's that need cm_gracetime */ | |
f3f80148 | 1434 | static void |
74725959 | 1435 | nfsd4_cld_grace_done_v0(struct nfsd_net *nn) |
f3f80148 JL |
1436 | { |
1437 | int ret; | |
1438 | struct cld_upcall *cup; | |
f3f80148 JL |
1439 | struct cld_net *cn = nn->cld_net; |
1440 | ||
11a60d15 | 1441 | cup = alloc_cld_upcall(nn); |
f3f80148 JL |
1442 | if (!cup) { |
1443 | ret = -ENOMEM; | |
1444 | goto out_err; | |
1445 | } | |
1446 | ||
11a60d15 SM |
1447 | cup->cu_u.cu_msg.cm_cmd = Cld_GraceDone; |
1448 | cup->cu_u.cu_msg.cm_u.cm_gracetime = (int64_t)nn->boot_time; | |
1449 | ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_u.cu_msg); | |
f3f80148 | 1450 | if (!ret) |
11a60d15 | 1451 | ret = cup->cu_u.cu_msg.cm_status; |
f3f80148 JL |
1452 | |
1453 | free_cld_upcall(cup); | |
1454 | out_err: | |
1455 | if (ret) | |
1456 | printk(KERN_ERR "NFSD: Unable to end grace period: %d\n", ret); | |
1457 | } | |
1458 | ||
74725959 SM |
1459 | /* |
1460 | * For newer nfsdcld's that do not need cm_gracetime. We also need to call | |
1461 | * nfs4_release_reclaim() to clear out the reclaim_str_hashtbl. | |
1462 | */ | |
1463 | static void | |
1464 | nfsd4_cld_grace_done(struct nfsd_net *nn) | |
1465 | { | |
1466 | int ret; | |
1467 | struct cld_upcall *cup; | |
1468 | struct cld_net *cn = nn->cld_net; | |
1469 | ||
11a60d15 | 1470 | cup = alloc_cld_upcall(nn); |
74725959 SM |
1471 | if (!cup) { |
1472 | ret = -ENOMEM; | |
1473 | goto out_err; | |
1474 | } | |
1475 | ||
11a60d15 SM |
1476 | cup->cu_u.cu_msg.cm_cmd = Cld_GraceDone; |
1477 | ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_u.cu_msg); | |
74725959 | 1478 | if (!ret) |
11a60d15 | 1479 | ret = cup->cu_u.cu_msg.cm_status; |
74725959 SM |
1480 | |
1481 | free_cld_upcall(cup); | |
1482 | out_err: | |
1483 | nfs4_release_reclaim(nn); | |
1484 | if (ret) | |
1485 | printk(KERN_ERR "NFSD: Unable to end grace period: %d\n", ret); | |
1486 | } | |
1487 | ||
1488 | static int | |
1489 | nfs4_cld_state_init(struct net *net) | |
1490 | { | |
1491 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); | |
1492 | int i; | |
1493 | ||
1494 | nn->reclaim_str_hashtbl = kmalloc_array(CLIENT_HASH_SIZE, | |
1495 | sizeof(struct list_head), | |
1496 | GFP_KERNEL); | |
1497 | if (!nn->reclaim_str_hashtbl) | |
1498 | return -ENOMEM; | |
1499 | ||
1500 | for (i = 0; i < CLIENT_HASH_SIZE; i++) | |
1501 | INIT_LIST_HEAD(&nn->reclaim_str_hashtbl[i]); | |
1502 | nn->reclaim_str_hashtbl_size = 0; | |
362063a5 SM |
1503 | nn->track_reclaim_completes = true; |
1504 | atomic_set(&nn->nr_reclaim_complete, 0); | |
74725959 SM |
1505 | |
1506 | return 0; | |
1507 | } | |
1508 | ||
1509 | static void | |
1510 | nfs4_cld_state_shutdown(struct net *net) | |
1511 | { | |
1512 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); | |
1513 | ||
362063a5 | 1514 | nn->track_reclaim_completes = false; |
74725959 SM |
1515 | kfree(nn->reclaim_str_hashtbl); |
1516 | } | |
1517 | ||
86921607 SM |
1518 | static bool |
1519 | cld_running(struct nfsd_net *nn) | |
1520 | { | |
1521 | struct cld_net *cn = nn->cld_net; | |
1522 | struct rpc_pipe *pipe = cn->cn_pipe; | |
1523 | ||
1524 | return pipe->nreaders || pipe->nwriters; | |
1525 | } | |
1526 | ||
11a60d15 SM |
1527 | static int |
1528 | nfsd4_cld_get_version(struct nfsd_net *nn) | |
1529 | { | |
1530 | int ret = 0; | |
1531 | struct cld_upcall *cup; | |
1532 | struct cld_net *cn = nn->cld_net; | |
1533 | uint8_t version; | |
1534 | ||
1535 | cup = alloc_cld_upcall(nn); | |
1536 | if (!cup) { | |
1537 | ret = -ENOMEM; | |
1538 | goto out_err; | |
1539 | } | |
1540 | cup->cu_u.cu_msg.cm_cmd = Cld_GetVersion; | |
1541 | ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_u.cu_msg); | |
1542 | if (!ret) { | |
1543 | ret = cup->cu_u.cu_msg.cm_status; | |
1544 | if (ret) | |
1545 | goto out_free; | |
1546 | version = cup->cu_u.cu_msg.cm_u.cm_version; | |
1547 | dprintk("%s: userspace returned version %u\n", | |
1548 | __func__, version); | |
1549 | if (version < 1) | |
1550 | version = 1; | |
1551 | else if (version > CLD_UPCALL_VERSION) | |
1552 | version = CLD_UPCALL_VERSION; | |
1553 | ||
1554 | switch (version) { | |
1555 | case 1: | |
1556 | nn->client_tracking_ops = &nfsd4_cld_tracking_ops; | |
1557 | break; | |
6ee95d1c SM |
1558 | case 2: |
1559 | nn->client_tracking_ops = &nfsd4_cld_tracking_ops_v2; | |
1560 | break; | |
11a60d15 SM |
1561 | default: |
1562 | break; | |
1563 | } | |
1564 | } | |
1565 | out_free: | |
1566 | free_cld_upcall(cup); | |
1567 | out_err: | |
1568 | if (ret) | |
1569 | dprintk("%s: Unable to get version from userspace: %d\n", | |
1570 | __func__, ret); | |
1571 | return ret; | |
1572 | } | |
1573 | ||
74725959 SM |
1574 | static int |
1575 | nfsd4_cld_tracking_init(struct net *net) | |
1576 | { | |
1577 | int status; | |
1578 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); | |
86921607 SM |
1579 | bool running; |
1580 | int retries = 10; | |
74725959 SM |
1581 | |
1582 | status = nfs4_cld_state_init(net); | |
1583 | if (status) | |
1584 | return status; | |
1585 | ||
86921607 | 1586 | status = __nfsd4_init_cld_pipe(net); |
74725959 SM |
1587 | if (status) |
1588 | goto err_shutdown; | |
6ee95d1c SM |
1589 | nn->cld_net->cn_tfm = crypto_alloc_shash("sha256", 0, 0); |
1590 | if (IS_ERR(nn->cld_net->cn_tfm)) { | |
1591 | status = PTR_ERR(nn->cld_net->cn_tfm); | |
1592 | goto err_remove; | |
1593 | } | |
74725959 | 1594 | |
86921607 SM |
1595 | /* |
1596 | * rpc pipe upcalls take 30 seconds to time out, so we don't want to | |
1597 | * queue an upcall unless we know that nfsdcld is running (because we | |
1598 | * want this to fail fast so that nfsd4_client_tracking_init() can try | |
1599 | * the next client tracking method). nfsdcld should already be running | |
1600 | * before nfsd is started, so the wait here is for nfsdcld to open the | |
1601 | * pipefs file we just created. | |
1602 | */ | |
1603 | while (!(running = cld_running(nn)) && retries--) | |
1604 | msleep(100); | |
1605 | ||
1606 | if (!running) { | |
1607 | status = -ETIMEDOUT; | |
1608 | goto err_remove; | |
1609 | } | |
1610 | ||
11a60d15 SM |
1611 | status = nfsd4_cld_get_version(nn); |
1612 | if (status == -EOPNOTSUPP) | |
1613 | pr_warn("NFSD: nfsdcld GetVersion upcall failed. Please upgrade nfsdcld.\n"); | |
1614 | ||
74725959 SM |
1615 | status = nfsd4_cld_grace_start(nn); |
1616 | if (status) { | |
1617 | if (status == -EOPNOTSUPP) | |
11a60d15 | 1618 | pr_warn("NFSD: nfsdcld GraceStart upcall failed. Please upgrade nfsdcld.\n"); |
74725959 SM |
1619 | nfs4_release_reclaim(nn); |
1620 | goto err_remove; | |
86921607 SM |
1621 | } else |
1622 | printk("NFSD: Using nfsdcld client tracking operations.\n"); | |
74725959 SM |
1623 | return 0; |
1624 | ||
1625 | err_remove: | |
1626 | nfsd4_remove_cld_pipe(net); | |
1627 | err_shutdown: | |
1628 | nfs4_cld_state_shutdown(net); | |
1629 | return status; | |
1630 | } | |
1631 | ||
1632 | static void | |
1633 | nfsd4_cld_tracking_exit(struct net *net) | |
1634 | { | |
1635 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); | |
1636 | ||
1637 | nfs4_release_reclaim(nn); | |
1638 | nfsd4_remove_cld_pipe(net); | |
1639 | nfs4_cld_state_shutdown(net); | |
1640 | } | |
1641 | ||
1642 | /* For older nfsdcld's */ | |
1643 | static const struct nfsd4_client_tracking_ops nfsd4_cld_tracking_ops_v0 = { | |
f3f80148 JL |
1644 | .init = nfsd4_init_cld_pipe, |
1645 | .exit = nfsd4_remove_cld_pipe, | |
1646 | .create = nfsd4_cld_create, | |
1647 | .remove = nfsd4_cld_remove, | |
74725959 SM |
1648 | .check = nfsd4_cld_check_v0, |
1649 | .grace_done = nfsd4_cld_grace_done_v0, | |
11a60d15 SM |
1650 | .version = 1, |
1651 | .msglen = sizeof(struct cld_msg), | |
74725959 SM |
1652 | }; |
1653 | ||
1654 | /* For newer nfsdcld's */ | |
1655 | static const struct nfsd4_client_tracking_ops nfsd4_cld_tracking_ops = { | |
1656 | .init = nfsd4_cld_tracking_init, | |
1657 | .exit = nfsd4_cld_tracking_exit, | |
1658 | .create = nfsd4_cld_create, | |
1659 | .remove = nfsd4_cld_remove, | |
f3f80148 JL |
1660 | .check = nfsd4_cld_check, |
1661 | .grace_done = nfsd4_cld_grace_done, | |
11a60d15 SM |
1662 | .version = 1, |
1663 | .msglen = sizeof(struct cld_msg), | |
f3f80148 JL |
1664 | }; |
1665 | ||
6ee95d1c SM |
1666 | /* v2 create/check ops include the principal, if available */ |
1667 | static const struct nfsd4_client_tracking_ops nfsd4_cld_tracking_ops_v2 = { | |
1668 | .init = nfsd4_cld_tracking_init, | |
1669 | .exit = nfsd4_cld_tracking_exit, | |
1670 | .create = nfsd4_cld_create_v2, | |
1671 | .remove = nfsd4_cld_remove, | |
1672 | .check = nfsd4_cld_check_v2, | |
1673 | .grace_done = nfsd4_cld_grace_done, | |
1674 | .version = 2, | |
1675 | .msglen = sizeof(struct cld_msg_v2), | |
1676 | }; | |
1677 | ||
2873d214 JL |
1678 | /* upcall via usermodehelper */ |
1679 | static char cltrack_prog[PATH_MAX] = "/sbin/nfsdcltrack"; | |
1680 | module_param_string(cltrack_prog, cltrack_prog, sizeof(cltrack_prog), | |
1681 | S_IRUGO|S_IWUSR); | |
1682 | MODULE_PARM_DESC(cltrack_prog, "Path to the nfsdcltrack upcall program"); | |
1683 | ||
f3aa7e24 JL |
1684 | static bool cltrack_legacy_disable; |
1685 | module_param(cltrack_legacy_disable, bool, S_IRUGO|S_IWUSR); | |
1686 | MODULE_PARM_DESC(cltrack_legacy_disable, | |
1687 | "Disable legacy recoverydir conversion. Default: false"); | |
1688 | ||
1689 | #define LEGACY_TOPDIR_ENV_PREFIX "NFSDCLTRACK_LEGACY_TOPDIR=" | |
1690 | #define LEGACY_RECDIR_ENV_PREFIX "NFSDCLTRACK_LEGACY_RECDIR=" | |
d4318acd JL |
1691 | #define HAS_SESSION_ENV_PREFIX "NFSDCLTRACK_CLIENT_HAS_SESSION=" |
1692 | #define GRACE_START_ENV_PREFIX "NFSDCLTRACK_GRACE_START=" | |
f3aa7e24 JL |
1693 | |
1694 | static char * | |
1695 | nfsd4_cltrack_legacy_topdir(void) | |
1696 | { | |
1697 | int copied; | |
1698 | size_t len; | |
1699 | char *result; | |
1700 | ||
1701 | if (cltrack_legacy_disable) | |
1702 | return NULL; | |
1703 | ||
1704 | len = strlen(LEGACY_TOPDIR_ENV_PREFIX) + | |
1705 | strlen(nfs4_recoverydir()) + 1; | |
1706 | ||
1707 | result = kmalloc(len, GFP_KERNEL); | |
1708 | if (!result) | |
1709 | return result; | |
1710 | ||
1711 | copied = snprintf(result, len, LEGACY_TOPDIR_ENV_PREFIX "%s", | |
1712 | nfs4_recoverydir()); | |
1713 | if (copied >= len) { | |
1714 | /* just return nothing if output was truncated */ | |
1715 | kfree(result); | |
1716 | return NULL; | |
1717 | } | |
1718 | ||
1719 | return result; | |
1720 | } | |
1721 | ||
1722 | static char * | |
2216d449 | 1723 | nfsd4_cltrack_legacy_recdir(const struct xdr_netobj *name) |
f3aa7e24 JL |
1724 | { |
1725 | int copied; | |
1726 | size_t len; | |
1727 | char *result; | |
1728 | ||
1729 | if (cltrack_legacy_disable) | |
1730 | return NULL; | |
1731 | ||
1732 | /* +1 is for '/' between "topdir" and "recdir" */ | |
1733 | len = strlen(LEGACY_RECDIR_ENV_PREFIX) + | |
1734 | strlen(nfs4_recoverydir()) + 1 + HEXDIR_LEN; | |
1735 | ||
1736 | result = kmalloc(len, GFP_KERNEL); | |
1737 | if (!result) | |
1738 | return result; | |
1739 | ||
2216d449 JL |
1740 | copied = snprintf(result, len, LEGACY_RECDIR_ENV_PREFIX "%s/", |
1741 | nfs4_recoverydir()); | |
1742 | if (copied > (len - HEXDIR_LEN)) { | |
1743 | /* just return nothing if output will be truncated */ | |
1744 | kfree(result); | |
1745 | return NULL; | |
1746 | } | |
1747 | ||
1748 | copied = nfs4_make_rec_clidname(result + copied, name); | |
1749 | if (copied) { | |
f3aa7e24 JL |
1750 | kfree(result); |
1751 | return NULL; | |
1752 | } | |
1753 | ||
1754 | return result; | |
1755 | } | |
1756 | ||
d4318acd JL |
1757 | static char * |
1758 | nfsd4_cltrack_client_has_session(struct nfs4_client *clp) | |
1759 | { | |
1760 | int copied; | |
1761 | size_t len; | |
1762 | char *result; | |
1763 | ||
1764 | /* prefix + Y/N character + terminating NULL */ | |
1765 | len = strlen(HAS_SESSION_ENV_PREFIX) + 1 + 1; | |
1766 | ||
1767 | result = kmalloc(len, GFP_KERNEL); | |
1768 | if (!result) | |
1769 | return result; | |
1770 | ||
1771 | copied = snprintf(result, len, HAS_SESSION_ENV_PREFIX "%c", | |
1772 | clp->cl_minorversion ? 'Y' : 'N'); | |
1773 | if (copied >= len) { | |
1774 | /* just return nothing if output was truncated */ | |
1775 | kfree(result); | |
1776 | return NULL; | |
1777 | } | |
1778 | ||
1779 | return result; | |
1780 | } | |
1781 | ||
1782 | static char * | |
1783 | nfsd4_cltrack_grace_start(time_t grace_start) | |
1784 | { | |
1785 | int copied; | |
1786 | size_t len; | |
1787 | char *result; | |
1788 | ||
1789 | /* prefix + max width of int64_t string + terminating NULL */ | |
1790 | len = strlen(GRACE_START_ENV_PREFIX) + 22 + 1; | |
1791 | ||
1792 | result = kmalloc(len, GFP_KERNEL); | |
1793 | if (!result) | |
1794 | return result; | |
1795 | ||
1796 | copied = snprintf(result, len, GRACE_START_ENV_PREFIX "%ld", | |
1797 | grace_start); | |
1798 | if (copied >= len) { | |
1799 | /* just return nothing if output was truncated */ | |
1800 | kfree(result); | |
1801 | return NULL; | |
1802 | } | |
1803 | ||
1804 | return result; | |
1805 | } | |
1806 | ||
2873d214 | 1807 | static int |
d4318acd | 1808 | nfsd4_umh_cltrack_upcall(char *cmd, char *arg, char *env0, char *env1) |
2873d214 | 1809 | { |
d4318acd | 1810 | char *envp[3]; |
2873d214 JL |
1811 | char *argv[4]; |
1812 | int ret; | |
1813 | ||
1814 | if (unlikely(!cltrack_prog[0])) { | |
1815 | dprintk("%s: cltrack_prog is disabled\n", __func__); | |
1816 | return -EACCES; | |
1817 | } | |
1818 | ||
1819 | dprintk("%s: cmd: %s\n", __func__, cmd); | |
1820 | dprintk("%s: arg: %s\n", __func__, arg ? arg : "(null)"); | |
d4318acd JL |
1821 | dprintk("%s: env0: %s\n", __func__, env0 ? env0 : "(null)"); |
1822 | dprintk("%s: env1: %s\n", __func__, env1 ? env1 : "(null)"); | |
f3aa7e24 | 1823 | |
d4318acd JL |
1824 | envp[0] = env0; |
1825 | envp[1] = env1; | |
1826 | envp[2] = NULL; | |
2873d214 JL |
1827 | |
1828 | argv[0] = (char *)cltrack_prog; | |
1829 | argv[1] = cmd; | |
1830 | argv[2] = arg; | |
1831 | argv[3] = NULL; | |
1832 | ||
1833 | ret = call_usermodehelper(argv[0], argv, envp, UMH_WAIT_PROC); | |
1834 | /* | |
1835 | * Disable the upcall mechanism if we're getting an ENOENT or EACCES | |
1836 | * error. The admin can re-enable it on the fly by using sysfs | |
1837 | * once the problem has been fixed. | |
1838 | */ | |
1839 | if (ret == -ENOENT || ret == -EACCES) { | |
1840 | dprintk("NFSD: %s was not found or isn't executable (%d). " | |
1841 | "Setting cltrack_prog to blank string!", | |
1842 | cltrack_prog, ret); | |
1843 | cltrack_prog[0] = '\0'; | |
1844 | } | |
1845 | dprintk("%s: %s return value: %d\n", __func__, cltrack_prog, ret); | |
1846 | ||
1847 | return ret; | |
1848 | } | |
1849 | ||
1850 | static char * | |
1851 | bin_to_hex_dup(const unsigned char *src, int srclen) | |
1852 | { | |
12b4157b | 1853 | char *buf; |
2873d214 JL |
1854 | |
1855 | /* +1 for terminating NULL */ | |
12b4157b | 1856 | buf = kzalloc((srclen * 2) + 1, GFP_KERNEL); |
2873d214 JL |
1857 | if (!buf) |
1858 | return buf; | |
1859 | ||
12b4157b | 1860 | bin2hex(buf, src, srclen); |
2873d214 JL |
1861 | return buf; |
1862 | } | |
1863 | ||
1864 | static int | |
d4318acd | 1865 | nfsd4_umh_cltrack_init(struct net *net) |
2873d214 | 1866 | { |
d4318acd JL |
1867 | int ret; |
1868 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); | |
1869 | char *grace_start = nfsd4_cltrack_grace_start(nn->boot_time); | |
1870 | ||
71a50306 SK |
1871 | /* XXX: The usermode helper s not working in container yet. */ |
1872 | if (net != &init_net) { | |
46cc8ba3 | 1873 | pr_warn("NFSD: attempt to initialize umh client tracking in a container ignored.\n"); |
956ccef3 | 1874 | kfree(grace_start); |
71a50306 SK |
1875 | return -EINVAL; |
1876 | } | |
d4318acd JL |
1877 | |
1878 | ret = nfsd4_umh_cltrack_upcall("init", NULL, grace_start, NULL); | |
1879 | kfree(grace_start); | |
86921607 SM |
1880 | if (!ret) |
1881 | printk("NFSD: Using UMH upcall client tracking operations.\n"); | |
d4318acd | 1882 | return ret; |
2873d214 JL |
1883 | } |
1884 | ||
d682e750 JL |
1885 | static void |
1886 | nfsd4_cltrack_upcall_lock(struct nfs4_client *clp) | |
1887 | { | |
1888 | wait_on_bit_lock(&clp->cl_flags, NFSD4_CLIENT_UPCALL_LOCK, | |
1889 | TASK_UNINTERRUPTIBLE); | |
1890 | } | |
1891 | ||
1892 | static void | |
1893 | nfsd4_cltrack_upcall_unlock(struct nfs4_client *clp) | |
1894 | { | |
1895 | smp_mb__before_atomic(); | |
1896 | clear_bit(NFSD4_CLIENT_UPCALL_LOCK, &clp->cl_flags); | |
1897 | smp_mb__after_atomic(); | |
1898 | wake_up_bit(&clp->cl_flags, NFSD4_CLIENT_UPCALL_LOCK); | |
1899 | } | |
1900 | ||
2873d214 JL |
1901 | static void |
1902 | nfsd4_umh_cltrack_create(struct nfs4_client *clp) | |
1903 | { | |
d4318acd JL |
1904 | char *hexid, *has_session, *grace_start; |
1905 | struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); | |
2873d214 | 1906 | |
65decb65 JL |
1907 | /* |
1908 | * With v4.0 clients, there's little difference in outcome between a | |
1909 | * create and check operation, and we can end up calling into this | |
1910 | * function multiple times per client (once for each openowner). So, | |
1911 | * for v4.0 clients skip upcalling once the client has been recorded | |
1912 | * on stable storage. | |
1913 | * | |
1914 | * For v4.1+ clients, the outcome of the two operations is different, | |
1915 | * so we must ensure that we upcall for the create operation. v4.1+ | |
1916 | * clients call this on RECLAIM_COMPLETE though, so we should only end | |
1917 | * up doing a single create upcall per client. | |
1918 | */ | |
1919 | if (clp->cl_minorversion == 0 && | |
1920 | test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) | |
1921 | return; | |
1922 | ||
2873d214 JL |
1923 | hexid = bin_to_hex_dup(clp->cl_name.data, clp->cl_name.len); |
1924 | if (!hexid) { | |
1925 | dprintk("%s: can't allocate memory for upcall!\n", __func__); | |
1926 | return; | |
1927 | } | |
d682e750 | 1928 | |
d4318acd JL |
1929 | has_session = nfsd4_cltrack_client_has_session(clp); |
1930 | grace_start = nfsd4_cltrack_grace_start(nn->boot_time); | |
d682e750 JL |
1931 | |
1932 | nfsd4_cltrack_upcall_lock(clp); | |
788a7914 JL |
1933 | if (!nfsd4_umh_cltrack_upcall("create", hexid, has_session, grace_start)) |
1934 | set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags); | |
d682e750 JL |
1935 | nfsd4_cltrack_upcall_unlock(clp); |
1936 | ||
d4318acd JL |
1937 | kfree(has_session); |
1938 | kfree(grace_start); | |
2873d214 JL |
1939 | kfree(hexid); |
1940 | } | |
1941 | ||
1942 | static void | |
1943 | nfsd4_umh_cltrack_remove(struct nfs4_client *clp) | |
1944 | { | |
1945 | char *hexid; | |
1946 | ||
788a7914 JL |
1947 | if (!test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) |
1948 | return; | |
1949 | ||
2873d214 JL |
1950 | hexid = bin_to_hex_dup(clp->cl_name.data, clp->cl_name.len); |
1951 | if (!hexid) { | |
1952 | dprintk("%s: can't allocate memory for upcall!\n", __func__); | |
1953 | return; | |
1954 | } | |
d682e750 JL |
1955 | |
1956 | nfsd4_cltrack_upcall_lock(clp); | |
788a7914 JL |
1957 | if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags) && |
1958 | nfsd4_umh_cltrack_upcall("remove", hexid, NULL, NULL) == 0) | |
1959 | clear_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags); | |
d682e750 JL |
1960 | nfsd4_cltrack_upcall_unlock(clp); |
1961 | ||
2873d214 JL |
1962 | kfree(hexid); |
1963 | } | |
1964 | ||
1965 | static int | |
1966 | nfsd4_umh_cltrack_check(struct nfs4_client *clp) | |
1967 | { | |
1968 | int ret; | |
d4318acd | 1969 | char *hexid, *has_session, *legacy; |
2873d214 | 1970 | |
788a7914 JL |
1971 | if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) |
1972 | return 0; | |
1973 | ||
2873d214 JL |
1974 | hexid = bin_to_hex_dup(clp->cl_name.data, clp->cl_name.len); |
1975 | if (!hexid) { | |
1976 | dprintk("%s: can't allocate memory for upcall!\n", __func__); | |
1977 | return -ENOMEM; | |
1978 | } | |
d4318acd JL |
1979 | |
1980 | has_session = nfsd4_cltrack_client_has_session(clp); | |
2216d449 | 1981 | legacy = nfsd4_cltrack_legacy_recdir(&clp->cl_name); |
d682e750 JL |
1982 | |
1983 | nfsd4_cltrack_upcall_lock(clp); | |
788a7914 JL |
1984 | if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) { |
1985 | ret = 0; | |
1986 | } else { | |
1987 | ret = nfsd4_umh_cltrack_upcall("check", hexid, has_session, legacy); | |
1988 | if (ret == 0) | |
1989 | set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags); | |
1990 | } | |
d682e750 | 1991 | nfsd4_cltrack_upcall_unlock(clp); |
d4318acd | 1992 | kfree(has_session); |
f3aa7e24 | 1993 | kfree(legacy); |
2873d214 | 1994 | kfree(hexid); |
d4318acd | 1995 | |
2873d214 JL |
1996 | return ret; |
1997 | } | |
1998 | ||
1999 | static void | |
919b8049 | 2000 | nfsd4_umh_cltrack_grace_done(struct nfsd_net *nn) |
2873d214 | 2001 | { |
f3aa7e24 | 2002 | char *legacy; |
2873d214 JL |
2003 | char timestr[22]; /* FIXME: better way to determine max size? */ |
2004 | ||
919b8049 | 2005 | sprintf(timestr, "%ld", nn->boot_time); |
f3aa7e24 | 2006 | legacy = nfsd4_cltrack_legacy_topdir(); |
d4318acd | 2007 | nfsd4_umh_cltrack_upcall("gracedone", timestr, legacy, NULL); |
f3aa7e24 | 2008 | kfree(legacy); |
2873d214 JL |
2009 | } |
2010 | ||
7c582e4f | 2011 | static const struct nfsd4_client_tracking_ops nfsd4_umh_tracking_ops = { |
2873d214 JL |
2012 | .init = nfsd4_umh_cltrack_init, |
2013 | .exit = NULL, | |
2014 | .create = nfsd4_umh_cltrack_create, | |
2015 | .remove = nfsd4_umh_cltrack_remove, | |
2016 | .check = nfsd4_umh_cltrack_check, | |
2017 | .grace_done = nfsd4_umh_cltrack_grace_done, | |
11a60d15 SM |
2018 | .version = 1, |
2019 | .msglen = 0, | |
2873d214 JL |
2020 | }; |
2021 | ||
2a4317c5 JL |
2022 | int |
2023 | nfsd4_client_tracking_init(struct net *net) | |
2024 | { | |
2025 | int status; | |
f3f80148 | 2026 | struct path path; |
9a9c6478 | 2027 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
2a4317c5 | 2028 | |
2d77bf0a | 2029 | /* just run the init if it the method is already decided */ |
9a9c6478 | 2030 | if (nn->client_tracking_ops) |
2d77bf0a JL |
2031 | goto do_init; |
2032 | ||
86921607 SM |
2033 | /* First, try to use nfsdcld */ |
2034 | nn->client_tracking_ops = &nfsd4_cld_tracking_ops; | |
2035 | status = nn->client_tracking_ops->init(net); | |
2036 | if (!status) | |
2037 | return status; | |
2038 | if (status != -ETIMEDOUT) { | |
2039 | nn->client_tracking_ops = &nfsd4_cld_tracking_ops_v0; | |
2040 | status = nn->client_tracking_ops->init(net); | |
2041 | if (!status) | |
2042 | return status; | |
2043 | } | |
2044 | ||
2d77bf0a | 2045 | /* |
86921607 | 2046 | * Next, try the UMH upcall. |
2d77bf0a | 2047 | */ |
9a9c6478 SK |
2048 | nn->client_tracking_ops = &nfsd4_umh_tracking_ops; |
2049 | status = nn->client_tracking_ops->init(net); | |
2d77bf0a JL |
2050 | if (!status) |
2051 | return status; | |
2052 | ||
2053 | /* | |
86921607 SM |
2054 | * Finally, See if the recoverydir exists and is a directory. |
2055 | * If it is, then use the legacy ops. | |
2d77bf0a | 2056 | */ |
9a9c6478 | 2057 | nn->client_tracking_ops = &nfsd4_legacy_tracking_ops; |
2d77bf0a JL |
2058 | status = kern_path(nfs4_recoverydir(), LOOKUP_FOLLOW, &path); |
2059 | if (!status) { | |
e36cb0b8 | 2060 | status = d_is_dir(path.dentry); |
2d77bf0a | 2061 | path_put(&path); |
86921607 SM |
2062 | if (!status) { |
2063 | status = -EINVAL; | |
2064 | goto out; | |
2065 | } | |
f3f80148 | 2066 | } |
2a4317c5 | 2067 | |
2d77bf0a | 2068 | do_init: |
9a9c6478 | 2069 | status = nn->client_tracking_ops->init(net); |
86921607 | 2070 | out: |
2a4317c5 JL |
2071 | if (status) { |
2072 | printk(KERN_WARNING "NFSD: Unable to initialize client " | |
2073 | "recovery tracking! (%d)\n", status); | |
9a9c6478 | 2074 | nn->client_tracking_ops = NULL; |
2a4317c5 JL |
2075 | } |
2076 | return status; | |
2077 | } | |
2078 | ||
2079 | void | |
2080 | nfsd4_client_tracking_exit(struct net *net) | |
2081 | { | |
9a9c6478 SK |
2082 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
2083 | ||
2084 | if (nn->client_tracking_ops) { | |
2085 | if (nn->client_tracking_ops->exit) | |
2086 | nn->client_tracking_ops->exit(net); | |
2087 | nn->client_tracking_ops = NULL; | |
2a4317c5 JL |
2088 | } |
2089 | } | |
2090 | ||
2091 | void | |
2092 | nfsd4_client_record_create(struct nfs4_client *clp) | |
2093 | { | |
9a9c6478 SK |
2094 | struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); |
2095 | ||
2096 | if (nn->client_tracking_ops) | |
2097 | nn->client_tracking_ops->create(clp); | |
2a4317c5 JL |
2098 | } |
2099 | ||
2100 | void | |
2101 | nfsd4_client_record_remove(struct nfs4_client *clp) | |
2102 | { | |
9a9c6478 SK |
2103 | struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); |
2104 | ||
2105 | if (nn->client_tracking_ops) | |
2106 | nn->client_tracking_ops->remove(clp); | |
2a4317c5 JL |
2107 | } |
2108 | ||
2109 | int | |
2110 | nfsd4_client_record_check(struct nfs4_client *clp) | |
2111 | { | |
9a9c6478 SK |
2112 | struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); |
2113 | ||
2114 | if (nn->client_tracking_ops) | |
2115 | return nn->client_tracking_ops->check(clp); | |
2a4317c5 JL |
2116 | |
2117 | return -EOPNOTSUPP; | |
2118 | } | |
2119 | ||
2120 | void | |
919b8049 | 2121 | nfsd4_record_grace_done(struct nfsd_net *nn) |
2a4317c5 | 2122 | { |
9a9c6478 | 2123 | if (nn->client_tracking_ops) |
919b8049 | 2124 | nn->client_tracking_ops->grace_done(nn); |
2a4317c5 | 2125 | } |
813fd320 JL |
2126 | |
2127 | static int | |
2128 | rpc_pipefs_event(struct notifier_block *nb, unsigned long event, void *ptr) | |
2129 | { | |
2130 | struct super_block *sb = ptr; | |
2131 | struct net *net = sb->s_fs_info; | |
2132 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); | |
2133 | struct cld_net *cn = nn->cld_net; | |
2134 | struct dentry *dentry; | |
2135 | int ret = 0; | |
2136 | ||
2137 | if (!try_module_get(THIS_MODULE)) | |
2138 | return 0; | |
2139 | ||
2140 | if (!cn) { | |
2141 | module_put(THIS_MODULE); | |
2142 | return 0; | |
2143 | } | |
2144 | ||
2145 | switch (event) { | |
2146 | case RPC_PIPEFS_MOUNT: | |
2147 | dentry = nfsd4_cld_register_sb(sb, cn->cn_pipe); | |
2148 | if (IS_ERR(dentry)) { | |
2149 | ret = PTR_ERR(dentry); | |
2150 | break; | |
2151 | } | |
2152 | cn->cn_pipe->dentry = dentry; | |
2153 | break; | |
2154 | case RPC_PIPEFS_UMOUNT: | |
2155 | if (cn->cn_pipe->dentry) | |
2156 | nfsd4_cld_unregister_sb(cn->cn_pipe); | |
2157 | break; | |
2158 | default: | |
2159 | ret = -ENOTSUPP; | |
2160 | break; | |
2161 | } | |
2162 | module_put(THIS_MODULE); | |
2163 | return ret; | |
2164 | } | |
2165 | ||
2355c596 | 2166 | static struct notifier_block nfsd4_cld_block = { |
813fd320 JL |
2167 | .notifier_call = rpc_pipefs_event, |
2168 | }; | |
797a9d79 JL |
2169 | |
2170 | int | |
2171 | register_cld_notifier(void) | |
2172 | { | |
2173 | return rpc_pipefs_notifier_register(&nfsd4_cld_block); | |
2174 | } | |
2175 | ||
2176 | void | |
2177 | unregister_cld_notifier(void) | |
2178 | { | |
2179 | rpc_pipefs_notifier_unregister(&nfsd4_cld_block); | |
2180 | } |