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Commit | Line | Data |
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a55370a3 N |
1 | /* |
2 | * linux/fs/nfsd/nfs4recover.c | |
3 | * | |
4 | * Copyright (c) 2004 The Regents of the University of Michigan. | |
5 | * All rights reserved. | |
6 | * | |
7 | * Andy Adamson <andros@citi.umich.edu> | |
8 | * | |
9 | * Redistribution and use in source and binary forms, with or without | |
10 | * modification, are permitted provided that the following conditions | |
11 | * are met: | |
12 | * | |
13 | * 1. Redistributions of source code must retain the above copyright | |
14 | * notice, this list of conditions and the following disclaimer. | |
15 | * 2. Redistributions in binary form must reproduce the above copyright | |
16 | * notice, this list of conditions and the following disclaimer in the | |
17 | * documentation and/or other materials provided with the distribution. | |
18 | * 3. Neither the name of the University nor the names of its | |
19 | * contributors may be used to endorse or promote products derived | |
20 | * from this software without specific prior written permission. | |
21 | * | |
22 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED | |
23 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF | |
24 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | |
25 | * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
26 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
27 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
28 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR | |
29 | * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF | |
30 | * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING | |
31 | * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS | |
32 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
33 | * | |
34 | */ | |
35 | ||
35058687 | 36 | #include <linux/err.h> |
a55370a3 N |
37 | #include <linux/sunrpc/svc.h> |
38 | #include <linux/nfsd/nfsd.h> | |
39 | #include <linux/nfs4.h> | |
40 | #include <linux/nfsd/state.h> | |
41 | #include <linux/nfsd/xdr4.h> | |
190e4fbf N |
42 | #include <linux/param.h> |
43 | #include <linux/file.h> | |
44 | #include <linux/namei.h> | |
a55370a3 | 45 | #include <asm/uaccess.h> |
87ae9afd | 46 | #include <linux/scatterlist.h> |
a55370a3 | 47 | #include <linux/crypto.h> |
e8edc6e0 | 48 | #include <linux/sched.h> |
0622753b | 49 | #include <linux/mount.h> |
a55370a3 N |
50 | |
51 | #define NFSDDBG_FACILITY NFSDDBG_PROC | |
52 | ||
190e4fbf | 53 | /* Globals */ |
a63bb996 | 54 | static struct path rec_dir; |
190e4fbf N |
55 | static int rec_dir_init = 0; |
56 | ||
d84f4f99 DH |
57 | static int |
58 | nfs4_save_creds(const struct cred **original_creds) | |
190e4fbf | 59 | { |
d84f4f99 DH |
60 | struct cred *new; |
61 | ||
62 | new = prepare_creds(); | |
63 | if (!new) | |
64 | return -ENOMEM; | |
65 | ||
66 | new->fsuid = 0; | |
67 | new->fsgid = 0; | |
68 | *original_creds = override_creds(new); | |
69 | put_cred(new); | |
70 | return 0; | |
190e4fbf N |
71 | } |
72 | ||
73 | static void | |
d84f4f99 | 74 | nfs4_reset_creds(const struct cred *original) |
190e4fbf | 75 | { |
d84f4f99 | 76 | revert_creds(original); |
190e4fbf N |
77 | } |
78 | ||
a55370a3 N |
79 | static void |
80 | md5_to_hex(char *out, char *md5) | |
81 | { | |
82 | int i; | |
83 | ||
84 | for (i=0; i<16; i++) { | |
85 | unsigned char c = md5[i]; | |
86 | ||
87 | *out++ = '0' + ((c&0xf0)>>4) + (c>=0xa0)*('a'-'9'-1); | |
88 | *out++ = '0' + (c&0x0f) + ((c&0x0f)>=0x0a)*('a'-'9'-1); | |
89 | } | |
90 | *out = '\0'; | |
91 | } | |
92 | ||
b37ad28b | 93 | __be32 |
a55370a3 N |
94 | nfs4_make_rec_clidname(char *dname, struct xdr_netobj *clname) |
95 | { | |
96 | struct xdr_netobj cksum; | |
35058687 | 97 | struct hash_desc desc; |
60c74f81 | 98 | struct scatterlist sg; |
b37ad28b | 99 | __be32 status = nfserr_resource; |
a55370a3 N |
100 | |
101 | dprintk("NFSD: nfs4_make_rec_clidname for %.*s\n", | |
102 | clname->len, clname->data); | |
35058687 HX |
103 | desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP; |
104 | desc.tfm = crypto_alloc_hash("md5", 0, CRYPTO_ALG_ASYNC); | |
105 | if (IS_ERR(desc.tfm)) | |
106 | goto out_no_tfm; | |
107 | cksum.len = crypto_hash_digestsize(desc.tfm); | |
a55370a3 N |
108 | cksum.data = kmalloc(cksum.len, GFP_KERNEL); |
109 | if (cksum.data == NULL) | |
110 | goto out; | |
a55370a3 | 111 | |
60c74f81 | 112 | sg_init_one(&sg, clname->data, clname->len); |
a55370a3 | 113 | |
60c74f81 | 114 | if (crypto_hash_digest(&desc, &sg, sg.length, cksum.data)) |
35058687 | 115 | goto out; |
a55370a3 N |
116 | |
117 | md5_to_hex(dname, cksum.data); | |
118 | ||
a55370a3 N |
119 | status = nfs_ok; |
120 | out: | |
2bd9e7b6 | 121 | kfree(cksum.data); |
35058687 HX |
122 | crypto_free_hash(desc.tfm); |
123 | out_no_tfm: | |
a55370a3 N |
124 | return status; |
125 | } | |
190e4fbf | 126 | |
a6ccbbb8 N |
127 | static void |
128 | nfsd4_sync_rec_dir(void) | |
c7b9a459 | 129 | { |
a63bb996 AV |
130 | mutex_lock(&rec_dir.dentry->d_inode->i_mutex); |
131 | nfsd_sync_dir(rec_dir.dentry); | |
132 | mutex_unlock(&rec_dir.dentry->d_inode->i_mutex); | |
c7b9a459 N |
133 | } |
134 | ||
135 | int | |
136 | nfsd4_create_clid_dir(struct nfs4_client *clp) | |
137 | { | |
d84f4f99 | 138 | const struct cred *original_cred; |
c7b9a459 N |
139 | char *dname = clp->cl_recdir; |
140 | struct dentry *dentry; | |
c7b9a459 N |
141 | int status; |
142 | ||
143 | dprintk("NFSD: nfsd4_create_clid_dir for \"%s\"\n", dname); | |
144 | ||
145 | if (!rec_dir_init || clp->cl_firststate) | |
146 | return 0; | |
147 | ||
d84f4f99 DH |
148 | status = nfs4_save_creds(&original_cred); |
149 | if (status < 0) | |
150 | return status; | |
c7b9a459 N |
151 | |
152 | /* lock the parent */ | |
a63bb996 | 153 | mutex_lock(&rec_dir.dentry->d_inode->i_mutex); |
c7b9a459 | 154 | |
a63bb996 | 155 | dentry = lookup_one_len(dname, rec_dir.dentry, HEXDIR_LEN-1); |
c7b9a459 N |
156 | if (IS_ERR(dentry)) { |
157 | status = PTR_ERR(dentry); | |
158 | goto out_unlock; | |
159 | } | |
160 | status = -EEXIST; | |
161 | if (dentry->d_inode) { | |
162 | dprintk("NFSD: nfsd4_create_clid_dir: DIRECTORY EXISTS\n"); | |
163 | goto out_put; | |
164 | } | |
a63bb996 | 165 | status = mnt_want_write(rec_dir.mnt); |
463c3197 DH |
166 | if (status) |
167 | goto out_put; | |
a63bb996 AV |
168 | status = vfs_mkdir(rec_dir.dentry->d_inode, dentry, S_IRWXU); |
169 | mnt_drop_write(rec_dir.mnt); | |
c7b9a459 N |
170 | out_put: |
171 | dput(dentry); | |
172 | out_unlock: | |
a63bb996 | 173 | mutex_unlock(&rec_dir.dentry->d_inode->i_mutex); |
c7b9a459 N |
174 | if (status == 0) { |
175 | clp->cl_firststate = 1; | |
a6ccbbb8 | 176 | nfsd4_sync_rec_dir(); |
c7b9a459 | 177 | } |
d84f4f99 | 178 | nfs4_reset_creds(original_cred); |
c7b9a459 N |
179 | dprintk("NFSD: nfsd4_create_clid_dir returns %d\n", status); |
180 | return status; | |
181 | } | |
182 | ||
190e4fbf N |
183 | typedef int (recdir_func)(struct dentry *, struct dentry *); |
184 | ||
05f4f678 BF |
185 | struct name_list { |
186 | char name[HEXDIR_LEN]; | |
190e4fbf N |
187 | struct list_head list; |
188 | }; | |
189 | ||
190e4fbf | 190 | static int |
05f4f678 | 191 | nfsd4_build_namelist(void *arg, const char *name, int namlen, |
afefdbb2 | 192 | loff_t offset, u64 ino, unsigned int d_type) |
190e4fbf | 193 | { |
05f4f678 BF |
194 | struct list_head *names = arg; |
195 | struct name_list *entry; | |
190e4fbf | 196 | |
05f4f678 | 197 | if (namlen != HEXDIR_LEN - 1) |
b37ad28b | 198 | return 0; |
05f4f678 BF |
199 | entry = kmalloc(sizeof(struct name_list), GFP_KERNEL); |
200 | if (entry == NULL) | |
190e4fbf | 201 | return -ENOMEM; |
05f4f678 BF |
202 | memcpy(entry->name, name, HEXDIR_LEN - 1); |
203 | entry->name[HEXDIR_LEN - 1] = '\0'; | |
204 | list_add(&entry->list, names); | |
190e4fbf N |
205 | return 0; |
206 | } | |
207 | ||
208 | static int | |
209 | nfsd4_list_rec_dir(struct dentry *dir, recdir_func *f) | |
210 | { | |
d84f4f99 | 211 | const struct cred *original_cred; |
190e4fbf | 212 | struct file *filp; |
05f4f678 BF |
213 | LIST_HEAD(names); |
214 | struct name_list *entry; | |
215 | struct dentry *dentry; | |
190e4fbf N |
216 | int status; |
217 | ||
218 | if (!rec_dir_init) | |
219 | return 0; | |
220 | ||
d84f4f99 DH |
221 | status = nfs4_save_creds(&original_cred); |
222 | if (status < 0) | |
223 | return status; | |
190e4fbf | 224 | |
745ca247 DH |
225 | filp = dentry_open(dget(dir), mntget(rec_dir.mnt), O_RDONLY, |
226 | current_cred()); | |
190e4fbf N |
227 | status = PTR_ERR(filp); |
228 | if (IS_ERR(filp)) | |
229 | goto out; | |
05f4f678 | 230 | status = vfs_readdir(filp, nfsd4_build_namelist, &names); |
190e4fbf | 231 | fput(filp); |
05f4f678 BF |
232 | while (!list_empty(&names)) { |
233 | entry = list_entry(names.next, struct name_list, list); | |
234 | ||
235 | dentry = lookup_one_len(entry->name, dir, HEXDIR_LEN-1); | |
236 | if (IS_ERR(dentry)) { | |
237 | status = PTR_ERR(dentry); | |
238 | goto out; | |
239 | } | |
240 | status = f(dir, dentry); | |
241 | dput(dentry); | |
190e4fbf N |
242 | if (status) |
243 | goto out; | |
05f4f678 BF |
244 | list_del(&entry->list); |
245 | kfree(entry); | |
190e4fbf N |
246 | } |
247 | out: | |
05f4f678 BF |
248 | while (!list_empty(&names)) { |
249 | entry = list_entry(names.next, struct name_list, list); | |
250 | list_del(&entry->list); | |
251 | kfree(entry); | |
190e4fbf | 252 | } |
d84f4f99 | 253 | nfs4_reset_creds(original_cred); |
190e4fbf N |
254 | return status; |
255 | } | |
256 | ||
c7b9a459 N |
257 | static int |
258 | nfsd4_remove_clid_file(struct dentry *dir, struct dentry *dentry) | |
259 | { | |
260 | int status; | |
261 | ||
262 | if (!S_ISREG(dir->d_inode->i_mode)) { | |
263 | printk("nfsd4: non-file found in client recovery directory\n"); | |
264 | return -EINVAL; | |
265 | } | |
4b75f78e | 266 | mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_PARENT); |
c7b9a459 | 267 | status = vfs_unlink(dir->d_inode, dentry); |
1b1dcc1b | 268 | mutex_unlock(&dir->d_inode->i_mutex); |
c7b9a459 N |
269 | return status; |
270 | } | |
271 | ||
272 | static int | |
273 | nfsd4_clear_clid_dir(struct dentry *dir, struct dentry *dentry) | |
274 | { | |
275 | int status; | |
276 | ||
277 | /* For now this directory should already be empty, but we empty it of | |
278 | * any regular files anyway, just in case the directory was created by | |
279 | * a kernel from the future.... */ | |
280 | nfsd4_list_rec_dir(dentry, nfsd4_remove_clid_file); | |
7ef55b8a | 281 | mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_PARENT); |
c7b9a459 | 282 | status = vfs_rmdir(dir->d_inode, dentry); |
1b1dcc1b | 283 | mutex_unlock(&dir->d_inode->i_mutex); |
c7b9a459 N |
284 | return status; |
285 | } | |
286 | ||
287 | static int | |
288 | nfsd4_unlink_clid_dir(char *name, int namlen) | |
289 | { | |
290 | struct dentry *dentry; | |
291 | int status; | |
292 | ||
293 | dprintk("NFSD: nfsd4_unlink_clid_dir. name %.*s\n", namlen, name); | |
294 | ||
a63bb996 AV |
295 | mutex_lock(&rec_dir.dentry->d_inode->i_mutex); |
296 | dentry = lookup_one_len(name, rec_dir.dentry, namlen); | |
297 | mutex_unlock(&rec_dir.dentry->d_inode->i_mutex); | |
c7b9a459 N |
298 | if (IS_ERR(dentry)) { |
299 | status = PTR_ERR(dentry); | |
300 | return status; | |
301 | } | |
302 | status = -ENOENT; | |
303 | if (!dentry->d_inode) | |
304 | goto out; | |
305 | ||
a63bb996 | 306 | status = nfsd4_clear_clid_dir(rec_dir.dentry, dentry); |
c7b9a459 N |
307 | out: |
308 | dput(dentry); | |
309 | return status; | |
310 | } | |
311 | ||
312 | void | |
313 | nfsd4_remove_clid_dir(struct nfs4_client *clp) | |
314 | { | |
d84f4f99 | 315 | const struct cred *original_cred; |
c7b9a459 N |
316 | int status; |
317 | ||
318 | if (!rec_dir_init || !clp->cl_firststate) | |
319 | return; | |
320 | ||
a63bb996 | 321 | status = mnt_want_write(rec_dir.mnt); |
0622753b DH |
322 | if (status) |
323 | goto out; | |
67be4313 | 324 | clp->cl_firststate = 0; |
d84f4f99 DH |
325 | |
326 | status = nfs4_save_creds(&original_cred); | |
327 | if (status < 0) | |
328 | goto out; | |
329 | ||
c7b9a459 | 330 | status = nfsd4_unlink_clid_dir(clp->cl_recdir, HEXDIR_LEN-1); |
d84f4f99 | 331 | nfs4_reset_creds(original_cred); |
c7b9a459 | 332 | if (status == 0) |
a6ccbbb8 | 333 | nfsd4_sync_rec_dir(); |
a63bb996 | 334 | mnt_drop_write(rec_dir.mnt); |
0622753b | 335 | out: |
c7b9a459 N |
336 | if (status) |
337 | printk("NFSD: Failed to remove expired client state directory" | |
338 | " %.*s\n", HEXDIR_LEN, clp->cl_recdir); | |
339 | return; | |
340 | } | |
341 | ||
342 | static int | |
343 | purge_old(struct dentry *parent, struct dentry *child) | |
344 | { | |
345 | int status; | |
346 | ||
a1bcecd2 AA |
347 | /* note: we currently use this path only for minorversion 0 */ |
348 | if (nfs4_has_reclaimed_state(child->d_name.name, false)) | |
b37ad28b | 349 | return 0; |
c7b9a459 N |
350 | |
351 | status = nfsd4_clear_clid_dir(parent, child); | |
352 | if (status) | |
353 | printk("failed to remove client recovery directory %s\n", | |
354 | child->d_name.name); | |
355 | /* Keep trying, success or failure: */ | |
b37ad28b | 356 | return 0; |
c7b9a459 N |
357 | } |
358 | ||
359 | void | |
360 | nfsd4_recdir_purge_old(void) { | |
361 | int status; | |
362 | ||
363 | if (!rec_dir_init) | |
364 | return; | |
a63bb996 | 365 | status = mnt_want_write(rec_dir.mnt); |
0622753b DH |
366 | if (status) |
367 | goto out; | |
a63bb996 | 368 | status = nfsd4_list_rec_dir(rec_dir.dentry, purge_old); |
c7b9a459 | 369 | if (status == 0) |
a6ccbbb8 | 370 | nfsd4_sync_rec_dir(); |
a63bb996 | 371 | mnt_drop_write(rec_dir.mnt); |
0622753b | 372 | out: |
c7b9a459 N |
373 | if (status) |
374 | printk("nfsd4: failed to purge old clients from recovery" | |
a63bb996 | 375 | " directory %s\n", rec_dir.dentry->d_name.name); |
c7b9a459 N |
376 | } |
377 | ||
190e4fbf N |
378 | static int |
379 | load_recdir(struct dentry *parent, struct dentry *child) | |
380 | { | |
381 | if (child->d_name.len != HEXDIR_LEN - 1) { | |
382 | printk("nfsd4: illegal name %s in recovery directory\n", | |
383 | child->d_name.name); | |
384 | /* Keep trying; maybe the others are OK: */ | |
b37ad28b | 385 | return 0; |
190e4fbf N |
386 | } |
387 | nfs4_client_to_reclaim(child->d_name.name); | |
b37ad28b | 388 | return 0; |
190e4fbf N |
389 | } |
390 | ||
391 | int | |
392 | nfsd4_recdir_load(void) { | |
393 | int status; | |
394 | ||
a63bb996 | 395 | status = nfsd4_list_rec_dir(rec_dir.dentry, load_recdir); |
190e4fbf N |
396 | if (status) |
397 | printk("nfsd4: failed loading clients from recovery" | |
a63bb996 | 398 | " directory %s\n", rec_dir.dentry->d_name.name); |
190e4fbf N |
399 | return status; |
400 | } | |
401 | ||
402 | /* | |
403 | * Hold reference to the recovery directory. | |
404 | */ | |
405 | ||
406 | void | |
407 | nfsd4_init_recdir(char *rec_dirname) | |
408 | { | |
d84f4f99 DH |
409 | const struct cred *original_cred; |
410 | int status; | |
190e4fbf N |
411 | |
412 | printk("NFSD: Using %s as the NFSv4 state recovery directory\n", | |
413 | rec_dirname); | |
414 | ||
415 | BUG_ON(rec_dir_init); | |
416 | ||
d84f4f99 DH |
417 | status = nfs4_save_creds(&original_cred); |
418 | if (status < 0) { | |
419 | printk("NFSD: Unable to change credentials to find recovery" | |
420 | " directory: error %d\n", | |
421 | status); | |
422 | return; | |
423 | } | |
190e4fbf | 424 | |
a63bb996 | 425 | status = kern_path(rec_dirname, LOOKUP_FOLLOW | LOOKUP_DIRECTORY, |
c2642ab0 BF |
426 | &rec_dir); |
427 | if (status) | |
428 | printk("NFSD: unable to find recovery directory %s\n", | |
190e4fbf N |
429 | rec_dirname); |
430 | ||
431 | if (!status) | |
432 | rec_dir_init = 1; | |
d84f4f99 | 433 | nfs4_reset_creds(original_cred); |
190e4fbf N |
434 | } |
435 | ||
436 | void | |
437 | nfsd4_shutdown_recdir(void) | |
438 | { | |
439 | if (!rec_dir_init) | |
440 | return; | |
441 | rec_dir_init = 0; | |
a63bb996 | 442 | path_put(&rec_dir); |
190e4fbf | 443 | } |