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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 N |
45 | #include <asm/uaccess.h> |
46 | #include <asm/scatterlist.h> | |
47 | #include <linux/crypto.h> | |
48 | ||
49 | ||
50 | #define NFSDDBG_FACILITY NFSDDBG_PROC | |
51 | ||
190e4fbf | 52 | /* Globals */ |
190e4fbf N |
53 | static struct nameidata rec_dir; |
54 | static int rec_dir_init = 0; | |
55 | ||
56 | static void | |
57 | nfs4_save_user(uid_t *saveuid, gid_t *savegid) | |
58 | { | |
59 | *saveuid = current->fsuid; | |
60 | *savegid = current->fsgid; | |
61 | current->fsuid = 0; | |
62 | current->fsgid = 0; | |
63 | } | |
64 | ||
65 | static void | |
66 | nfs4_reset_user(uid_t saveuid, gid_t savegid) | |
67 | { | |
68 | current->fsuid = saveuid; | |
69 | current->fsgid = savegid; | |
70 | } | |
71 | ||
a55370a3 N |
72 | static void |
73 | md5_to_hex(char *out, char *md5) | |
74 | { | |
75 | int i; | |
76 | ||
77 | for (i=0; i<16; i++) { | |
78 | unsigned char c = md5[i]; | |
79 | ||
80 | *out++ = '0' + ((c&0xf0)>>4) + (c>=0xa0)*('a'-'9'-1); | |
81 | *out++ = '0' + (c&0x0f) + ((c&0x0f)>=0x0a)*('a'-'9'-1); | |
82 | } | |
83 | *out = '\0'; | |
84 | } | |
85 | ||
b37ad28b | 86 | __be32 |
a55370a3 N |
87 | nfs4_make_rec_clidname(char *dname, struct xdr_netobj *clname) |
88 | { | |
89 | struct xdr_netobj cksum; | |
35058687 | 90 | struct hash_desc desc; |
a55370a3 | 91 | struct scatterlist sg[1]; |
b37ad28b | 92 | __be32 status = nfserr_resource; |
a55370a3 N |
93 | |
94 | dprintk("NFSD: nfs4_make_rec_clidname for %.*s\n", | |
95 | clname->len, clname->data); | |
35058687 HX |
96 | desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP; |
97 | desc.tfm = crypto_alloc_hash("md5", 0, CRYPTO_ALG_ASYNC); | |
98 | if (IS_ERR(desc.tfm)) | |
99 | goto out_no_tfm; | |
100 | cksum.len = crypto_hash_digestsize(desc.tfm); | |
a55370a3 N |
101 | cksum.data = kmalloc(cksum.len, GFP_KERNEL); |
102 | if (cksum.data == NULL) | |
103 | goto out; | |
a55370a3 N |
104 | |
105 | sg[0].page = virt_to_page(clname->data); | |
106 | sg[0].offset = offset_in_page(clname->data); | |
107 | sg[0].length = clname->len; | |
108 | ||
35058687 HX |
109 | if (crypto_hash_digest(&desc, sg, sg->length, cksum.data)) |
110 | goto out; | |
a55370a3 N |
111 | |
112 | md5_to_hex(dname, cksum.data); | |
113 | ||
114 | kfree(cksum.data); | |
115 | status = nfs_ok; | |
116 | out: | |
35058687 HX |
117 | crypto_free_hash(desc.tfm); |
118 | out_no_tfm: | |
a55370a3 N |
119 | return status; |
120 | } | |
190e4fbf | 121 | |
a6ccbbb8 N |
122 | static void |
123 | nfsd4_sync_rec_dir(void) | |
c7b9a459 | 124 | { |
1b1dcc1b | 125 | mutex_lock(&rec_dir.dentry->d_inode->i_mutex); |
a6ccbbb8 | 126 | nfsd_sync_dir(rec_dir.dentry); |
1b1dcc1b | 127 | mutex_unlock(&rec_dir.dentry->d_inode->i_mutex); |
c7b9a459 N |
128 | } |
129 | ||
130 | int | |
131 | nfsd4_create_clid_dir(struct nfs4_client *clp) | |
132 | { | |
133 | char *dname = clp->cl_recdir; | |
134 | struct dentry *dentry; | |
135 | uid_t uid; | |
136 | gid_t gid; | |
137 | int status; | |
138 | ||
139 | dprintk("NFSD: nfsd4_create_clid_dir for \"%s\"\n", dname); | |
140 | ||
141 | if (!rec_dir_init || clp->cl_firststate) | |
142 | return 0; | |
143 | ||
144 | nfs4_save_user(&uid, &gid); | |
145 | ||
146 | /* lock the parent */ | |
1b1dcc1b | 147 | mutex_lock(&rec_dir.dentry->d_inode->i_mutex); |
c7b9a459 N |
148 | |
149 | dentry = lookup_one_len(dname, rec_dir.dentry, HEXDIR_LEN-1); | |
150 | if (IS_ERR(dentry)) { | |
151 | status = PTR_ERR(dentry); | |
152 | goto out_unlock; | |
153 | } | |
154 | status = -EEXIST; | |
155 | if (dentry->d_inode) { | |
156 | dprintk("NFSD: nfsd4_create_clid_dir: DIRECTORY EXISTS\n"); | |
157 | goto out_put; | |
158 | } | |
159 | status = vfs_mkdir(rec_dir.dentry->d_inode, dentry, S_IRWXU); | |
160 | out_put: | |
161 | dput(dentry); | |
162 | out_unlock: | |
1b1dcc1b | 163 | mutex_unlock(&rec_dir.dentry->d_inode->i_mutex); |
c7b9a459 N |
164 | if (status == 0) { |
165 | clp->cl_firststate = 1; | |
a6ccbbb8 | 166 | nfsd4_sync_rec_dir(); |
c7b9a459 N |
167 | } |
168 | nfs4_reset_user(uid, gid); | |
169 | dprintk("NFSD: nfsd4_create_clid_dir returns %d\n", status); | |
170 | return status; | |
171 | } | |
172 | ||
190e4fbf N |
173 | typedef int (recdir_func)(struct dentry *, struct dentry *); |
174 | ||
175 | struct dentry_list { | |
176 | struct dentry *dentry; | |
177 | struct list_head list; | |
178 | }; | |
179 | ||
180 | struct dentry_list_arg { | |
181 | struct list_head dentries; | |
182 | struct dentry *parent; | |
183 | }; | |
184 | ||
185 | static int | |
186 | nfsd4_build_dentrylist(void *arg, const char *name, int namlen, | |
afefdbb2 | 187 | loff_t offset, u64 ino, unsigned int d_type) |
190e4fbf N |
188 | { |
189 | struct dentry_list_arg *dla = arg; | |
190 | struct list_head *dentries = &dla->dentries; | |
191 | struct dentry *parent = dla->parent; | |
192 | struct dentry *dentry; | |
193 | struct dentry_list *child; | |
194 | ||
195 | if (name && isdotent(name, namlen)) | |
b37ad28b | 196 | return 0; |
190e4fbf N |
197 | dentry = lookup_one_len(name, parent, namlen); |
198 | if (IS_ERR(dentry)) | |
199 | return PTR_ERR(dentry); | |
200 | child = kmalloc(sizeof(*child), GFP_KERNEL); | |
201 | if (child == NULL) | |
202 | return -ENOMEM; | |
203 | child->dentry = dentry; | |
204 | list_add(&child->list, dentries); | |
205 | return 0; | |
206 | } | |
207 | ||
208 | static int | |
209 | nfsd4_list_rec_dir(struct dentry *dir, recdir_func *f) | |
210 | { | |
211 | struct file *filp; | |
212 | struct dentry_list_arg dla = { | |
213 | .parent = dir, | |
214 | }; | |
215 | struct list_head *dentries = &dla.dentries; | |
216 | struct dentry_list *child; | |
217 | uid_t uid; | |
218 | gid_t gid; | |
219 | int status; | |
220 | ||
221 | if (!rec_dir_init) | |
222 | return 0; | |
223 | ||
224 | nfs4_save_user(&uid, &gid); | |
225 | ||
d22749b6 | 226 | filp = dentry_open(dget(dir), mntget(rec_dir.mnt), O_RDONLY); |
190e4fbf N |
227 | status = PTR_ERR(filp); |
228 | if (IS_ERR(filp)) | |
229 | goto out; | |
230 | INIT_LIST_HEAD(dentries); | |
231 | status = vfs_readdir(filp, nfsd4_build_dentrylist, &dla); | |
232 | fput(filp); | |
233 | while (!list_empty(dentries)) { | |
234 | child = list_entry(dentries->next, struct dentry_list, list); | |
235 | status = f(dir, child->dentry); | |
236 | if (status) | |
237 | goto out; | |
238 | list_del(&child->list); | |
239 | dput(child->dentry); | |
240 | kfree(child); | |
241 | } | |
242 | out: | |
243 | while (!list_empty(dentries)) { | |
244 | child = list_entry(dentries->next, struct dentry_list, list); | |
245 | list_del(&child->list); | |
246 | dput(child->dentry); | |
247 | kfree(child); | |
248 | } | |
249 | nfs4_reset_user(uid, gid); | |
250 | return status; | |
251 | } | |
252 | ||
c7b9a459 N |
253 | static int |
254 | nfsd4_remove_clid_file(struct dentry *dir, struct dentry *dentry) | |
255 | { | |
256 | int status; | |
257 | ||
258 | if (!S_ISREG(dir->d_inode->i_mode)) { | |
259 | printk("nfsd4: non-file found in client recovery directory\n"); | |
260 | return -EINVAL; | |
261 | } | |
1b1dcc1b | 262 | mutex_lock(&dir->d_inode->i_mutex); |
c7b9a459 | 263 | status = vfs_unlink(dir->d_inode, dentry); |
1b1dcc1b | 264 | mutex_unlock(&dir->d_inode->i_mutex); |
c7b9a459 N |
265 | return status; |
266 | } | |
267 | ||
268 | static int | |
269 | nfsd4_clear_clid_dir(struct dentry *dir, struct dentry *dentry) | |
270 | { | |
271 | int status; | |
272 | ||
273 | /* For now this directory should already be empty, but we empty it of | |
274 | * any regular files anyway, just in case the directory was created by | |
275 | * a kernel from the future.... */ | |
276 | nfsd4_list_rec_dir(dentry, nfsd4_remove_clid_file); | |
1b1dcc1b | 277 | mutex_lock(&dir->d_inode->i_mutex); |
c7b9a459 | 278 | status = vfs_rmdir(dir->d_inode, dentry); |
1b1dcc1b | 279 | mutex_unlock(&dir->d_inode->i_mutex); |
c7b9a459 N |
280 | return status; |
281 | } | |
282 | ||
283 | static int | |
284 | nfsd4_unlink_clid_dir(char *name, int namlen) | |
285 | { | |
286 | struct dentry *dentry; | |
287 | int status; | |
288 | ||
289 | dprintk("NFSD: nfsd4_unlink_clid_dir. name %.*s\n", namlen, name); | |
290 | ||
1b1dcc1b | 291 | mutex_lock(&rec_dir.dentry->d_inode->i_mutex); |
c7b9a459 | 292 | dentry = lookup_one_len(name, rec_dir.dentry, namlen); |
1b1dcc1b | 293 | mutex_unlock(&rec_dir.dentry->d_inode->i_mutex); |
c7b9a459 N |
294 | if (IS_ERR(dentry)) { |
295 | status = PTR_ERR(dentry); | |
296 | return status; | |
297 | } | |
298 | status = -ENOENT; | |
299 | if (!dentry->d_inode) | |
300 | goto out; | |
301 | ||
302 | status = nfsd4_clear_clid_dir(rec_dir.dentry, dentry); | |
303 | out: | |
304 | dput(dentry); | |
305 | return status; | |
306 | } | |
307 | ||
308 | void | |
309 | nfsd4_remove_clid_dir(struct nfs4_client *clp) | |
310 | { | |
311 | uid_t uid; | |
312 | gid_t gid; | |
313 | int status; | |
314 | ||
315 | if (!rec_dir_init || !clp->cl_firststate) | |
316 | return; | |
317 | ||
67be4313 | 318 | clp->cl_firststate = 0; |
c7b9a459 N |
319 | nfs4_save_user(&uid, &gid); |
320 | status = nfsd4_unlink_clid_dir(clp->cl_recdir, HEXDIR_LEN-1); | |
321 | nfs4_reset_user(uid, gid); | |
322 | if (status == 0) | |
a6ccbbb8 | 323 | nfsd4_sync_rec_dir(); |
c7b9a459 N |
324 | if (status) |
325 | printk("NFSD: Failed to remove expired client state directory" | |
326 | " %.*s\n", HEXDIR_LEN, clp->cl_recdir); | |
327 | return; | |
328 | } | |
329 | ||
330 | static int | |
331 | purge_old(struct dentry *parent, struct dentry *child) | |
332 | { | |
333 | int status; | |
334 | ||
335 | if (nfs4_has_reclaimed_state(child->d_name.name)) | |
b37ad28b | 336 | return 0; |
c7b9a459 N |
337 | |
338 | status = nfsd4_clear_clid_dir(parent, child); | |
339 | if (status) | |
340 | printk("failed to remove client recovery directory %s\n", | |
341 | child->d_name.name); | |
342 | /* Keep trying, success or failure: */ | |
b37ad28b | 343 | return 0; |
c7b9a459 N |
344 | } |
345 | ||
346 | void | |
347 | nfsd4_recdir_purge_old(void) { | |
348 | int status; | |
349 | ||
350 | if (!rec_dir_init) | |
351 | return; | |
352 | status = nfsd4_list_rec_dir(rec_dir.dentry, purge_old); | |
353 | if (status == 0) | |
a6ccbbb8 | 354 | nfsd4_sync_rec_dir(); |
c7b9a459 N |
355 | if (status) |
356 | printk("nfsd4: failed to purge old clients from recovery" | |
357 | " directory %s\n", rec_dir.dentry->d_name.name); | |
358 | return; | |
359 | } | |
360 | ||
190e4fbf N |
361 | static int |
362 | load_recdir(struct dentry *parent, struct dentry *child) | |
363 | { | |
364 | if (child->d_name.len != HEXDIR_LEN - 1) { | |
365 | printk("nfsd4: illegal name %s in recovery directory\n", | |
366 | child->d_name.name); | |
367 | /* Keep trying; maybe the others are OK: */ | |
b37ad28b | 368 | return 0; |
190e4fbf N |
369 | } |
370 | nfs4_client_to_reclaim(child->d_name.name); | |
b37ad28b | 371 | return 0; |
190e4fbf N |
372 | } |
373 | ||
374 | int | |
375 | nfsd4_recdir_load(void) { | |
376 | int status; | |
377 | ||
378 | status = nfsd4_list_rec_dir(rec_dir.dentry, load_recdir); | |
379 | if (status) | |
380 | printk("nfsd4: failed loading clients from recovery" | |
381 | " directory %s\n", rec_dir.dentry->d_name.name); | |
382 | return status; | |
383 | } | |
384 | ||
385 | /* | |
386 | * Hold reference to the recovery directory. | |
387 | */ | |
388 | ||
389 | void | |
390 | nfsd4_init_recdir(char *rec_dirname) | |
391 | { | |
392 | uid_t uid = 0; | |
393 | gid_t gid = 0; | |
394 | int status; | |
395 | ||
396 | printk("NFSD: Using %s as the NFSv4 state recovery directory\n", | |
397 | rec_dirname); | |
398 | ||
399 | BUG_ON(rec_dir_init); | |
400 | ||
401 | nfs4_save_user(&uid, &gid); | |
402 | ||
c2642ab0 BF |
403 | status = path_lookup(rec_dirname, LOOKUP_FOLLOW | LOOKUP_DIRECTORY, |
404 | &rec_dir); | |
405 | if (status) | |
406 | printk("NFSD: unable to find recovery directory %s\n", | |
190e4fbf N |
407 | rec_dirname); |
408 | ||
409 | if (!status) | |
410 | rec_dir_init = 1; | |
411 | nfs4_reset_user(uid, gid); | |
412 | } | |
413 | ||
414 | void | |
415 | nfsd4_shutdown_recdir(void) | |
416 | { | |
417 | if (!rec_dir_init) | |
418 | return; | |
419 | rec_dir_init = 0; | |
420 | path_release(&rec_dir); | |
421 | } |