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Linux/fs/nfsd/nfs4recover.c

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  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 
 36 #include <linux/err.h>
 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>
 42 #include <linux/param.h>
 43 #include <linux/file.h>
 44 #include <linux/namei.h>
 45 #include <asm/uaccess.h>
 46 #include <linux/scatterlist.h>
 47 #include <linux/crypto.h>
 48 #include <linux/sched.h>
 49 #include <linux/mount.h>
 50 
 51 #define NFSDDBG_FACILITY                NFSDDBG_PROC
 52 
 53 /* Globals */
 54 static struct path rec_dir;
 55 static int rec_dir_init = 0;
 56 
 57 static int
 58 nfs4_save_creds(const struct cred **original_creds)
 59 {
 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;
 71 }
 72 
 73 static void
 74 nfs4_reset_creds(const struct cred *original)
 75 {
 76         revert_creds(original);
 77 }
 78 
 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++ = '' + ((c&0xf0)>>4) + (c>=0xa0)*('a'-'9'-1);
 88                 *out++ = '' + (c&0x0f) + ((c&0x0f)>=0x0a)*('a'-'9'-1);
 89         }
 90         *out = '\0';
 91 }
 92 
 93 __be32
 94 nfs4_make_rec_clidname(char *dname, struct xdr_netobj *clname)
 95 {
 96         struct xdr_netobj cksum;
 97         struct hash_desc desc;
 98         struct scatterlist sg;
 99         __be32 status = nfserr_resource;
100 
101         dprintk("NFSD: nfs4_make_rec_clidname for %.*s\n",
102                         clname->len, clname->data);
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);
108         cksum.data = kmalloc(cksum.len, GFP_KERNEL);
109         if (cksum.data == NULL)
110                 goto out;
111 
112         sg_init_one(&sg, clname->data, clname->len);
113 
114         if (crypto_hash_digest(&desc, &sg, sg.length, cksum.data))
115                 goto out;
116 
117         md5_to_hex(dname, cksum.data);
118 
119         status = nfs_ok;
120 out:
121         kfree(cksum.data);
122         crypto_free_hash(desc.tfm);
123 out_no_tfm:
124         return status;
125 }
126 
127 static void
128 nfsd4_sync_rec_dir(void)
129 {
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);
133 }
134 
135 int
136 nfsd4_create_clid_dir(struct nfs4_client *clp)
137 {
138         const struct cred *original_cred;
139         char *dname = clp->cl_recdir;
140         struct dentry *dentry;
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 
148         status = nfs4_save_creds(&original_cred);
149         if (status < 0)
150                 return status;
151 
152         /* lock the parent */
153         mutex_lock(&rec_dir.dentry->d_inode->i_mutex);
154 
155         dentry = lookup_one_len(dname, rec_dir.dentry, HEXDIR_LEN-1);
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         }
165         status = mnt_want_write(rec_dir.mnt);
166         if (status)
167                 goto out_put;
168         status = vfs_mkdir(rec_dir.dentry->d_inode, dentry, S_IRWXU);
169         mnt_drop_write(rec_dir.mnt);
170 out_put:
171         dput(dentry);
172 out_unlock:
173         mutex_unlock(&rec_dir.dentry->d_inode->i_mutex);
174         if (status == 0) {
175                 clp->cl_firststate = 1;
176                 nfsd4_sync_rec_dir();
177         }
178         nfs4_reset_creds(original_cred);
179         dprintk("NFSD: nfsd4_create_clid_dir returns %d\n", status);
180         return status;
181 }
182 
183 typedef int (recdir_func)(struct dentry *, struct dentry *);
184 
185 struct name_list {
186         char name[HEXDIR_LEN];
187         struct list_head list;
188 };
189 
190 static int
191 nfsd4_build_namelist(void *arg, const char *name, int namlen,
192                 loff_t offset, u64 ino, unsigned int d_type)
193 {
194         struct list_head *names = arg;
195         struct name_list *entry;
196 
197         if (namlen != HEXDIR_LEN - 1)
198                 return 0;
199         entry = kmalloc(sizeof(struct name_list), GFP_KERNEL);
200         if (entry == NULL)
201                 return -ENOMEM;
202         memcpy(entry->name, name, HEXDIR_LEN - 1);
203         entry->name[HEXDIR_LEN - 1] = '\0';
204         list_add(&entry->list, names);
205         return 0;
206 }
207 
208 static int
209 nfsd4_list_rec_dir(struct dentry *dir, recdir_func *f)
210 {
211         const struct cred *original_cred;
212         struct file *filp;
213         LIST_HEAD(names);
214         struct name_list *entry;
215         struct dentry *dentry;
216         int status;
217 
218         if (!rec_dir_init)
219                 return 0;
220 
221         status = nfs4_save_creds(&original_cred);
222         if (status < 0)
223                 return status;
224 
225         filp = dentry_open(dget(dir), mntget(rec_dir.mnt), O_RDONLY,
226                            current_cred());
227         status = PTR_ERR(filp);
228         if (IS_ERR(filp))
229                 goto out;
230         status = vfs_readdir(filp, nfsd4_build_namelist, &names);
231         fput(filp);
232         mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_PARENT);
233         while (!list_empty(&names)) {
234                 entry = list_entry(names.next, struct name_list, list);
235 
236                 dentry = lookup_one_len(entry->name, dir, HEXDIR_LEN-1);
237                 if (IS_ERR(dentry)) {
238                         status = PTR_ERR(dentry);
239                         break;
240                 }
241                 status = f(dir, dentry);
242                 dput(dentry);
243                 if (status)
244                         break;
245                 list_del(&entry->list);
246                 kfree(entry);
247         }
248         mutex_unlock(&dir->d_inode->i_mutex);
249 out:
250         while (!list_empty(&names)) {
251                 entry = list_entry(names.next, struct name_list, list);
252                 list_del(&entry->list);
253                 kfree(entry);
254         }
255         nfs4_reset_creds(original_cred);
256         return status;
257 }
258 
259 static int
260 nfsd4_unlink_clid_dir(char *name, int namlen)
261 {
262         struct dentry *dentry;
263         int status;
264 
265         dprintk("NFSD: nfsd4_unlink_clid_dir. name %.*s\n", namlen, name);
266 
267         mutex_lock_nested(&rec_dir.dentry->d_inode->i_mutex, I_MUTEX_PARENT);
268         dentry = lookup_one_len(name, rec_dir.dentry, namlen);
269         if (IS_ERR(dentry)) {
270                 status = PTR_ERR(dentry);
271                 goto out_unlock;
272         }
273         status = -ENOENT;
274         if (!dentry->d_inode)
275                 goto out;
276         status = vfs_rmdir(rec_dir.dentry->d_inode, dentry);
277 out:
278         dput(dentry);
279 out_unlock:
280         mutex_unlock(&rec_dir.dentry->d_inode->i_mutex);
281         return status;
282 }
283 
284 void
285 nfsd4_remove_clid_dir(struct nfs4_client *clp)
286 {
287         const struct cred *original_cred;
288         int status;
289 
290         if (!rec_dir_init || !clp->cl_firststate)
291                 return;
292 
293         status = mnt_want_write(rec_dir.mnt);
294         if (status)
295                 goto out;
296         clp->cl_firststate = 0;
297 
298         status = nfs4_save_creds(&original_cred);
299         if (status < 0)
300                 goto out;
301 
302         status = nfsd4_unlink_clid_dir(clp->cl_recdir, HEXDIR_LEN-1);
303         nfs4_reset_creds(original_cred);
304         if (status == 0)
305                 nfsd4_sync_rec_dir();
306         mnt_drop_write(rec_dir.mnt);
307 out:
308         if (status)
309                 printk("NFSD: Failed to remove expired client state directory"
310                                 " %.*s\n", HEXDIR_LEN, clp->cl_recdir);
311         return;
312 }
313 
314 static int
315 purge_old(struct dentry *parent, struct dentry *child)
316 {
317         int status;
318 
319         /* note: we currently use this path only for minorversion 0 */
320         if (nfs4_has_reclaimed_state(child->d_name.name, false))
321                 return 0;
322 
323         status = vfs_rmdir(parent->d_inode, child);
324         if (status)
325                 printk("failed to remove client recovery directory %s\n",
326                                 child->d_name.name);
327         /* Keep trying, success or failure: */
328         return 0;
329 }
330 
331 void
332 nfsd4_recdir_purge_old(void) {
333         int status;
334 
335         if (!rec_dir_init)
336                 return;
337         status = mnt_want_write(rec_dir.mnt);
338         if (status)
339                 goto out;
340         status = nfsd4_list_rec_dir(rec_dir.dentry, purge_old);
341         if (status == 0)
342                 nfsd4_sync_rec_dir();
343         mnt_drop_write(rec_dir.mnt);
344 out:
345         if (status)
346                 printk("nfsd4: failed to purge old clients from recovery"
347                         " directory %s\n", rec_dir.dentry->d_name.name);
348 }
349 
350 static int
351 load_recdir(struct dentry *parent, struct dentry *child)
352 {
353         if (child->d_name.len != HEXDIR_LEN - 1) {
354                 printk("nfsd4: illegal name %s in recovery directory\n",
355                                 child->d_name.name);
356                 /* Keep trying; maybe the others are OK: */
357                 return 0;
358         }
359         nfs4_client_to_reclaim(child->d_name.name);
360         return 0;
361 }
362 
363 int
364 nfsd4_recdir_load(void) {
365         int status;
366 
367         status = nfsd4_list_rec_dir(rec_dir.dentry, load_recdir);
368         if (status)
369                 printk("nfsd4: failed loading clients from recovery"
370                         " directory %s\n", rec_dir.dentry->d_name.name);
371         return status;
372 }
373 
374 /*
375  * Hold reference to the recovery directory.
376  */
377 
378 void
379 nfsd4_init_recdir(char *rec_dirname)
380 {
381         const struct cred *original_cred;
382         int status;
383 
384         printk("NFSD: Using %s as the NFSv4 state recovery directory\n",
385                         rec_dirname);
386 
387         BUG_ON(rec_dir_init);
388 
389         status = nfs4_save_creds(&original_cred);
390         if (status < 0) {
391                 printk("NFSD: Unable to change credentials to find recovery"
392                        " directory: error %d\n",
393                        status);
394                 return;
395         }
396 
397         status = kern_path(rec_dirname, LOOKUP_FOLLOW | LOOKUP_DIRECTORY,
398                         &rec_dir);
399         if (status)
400                 printk("NFSD: unable to find recovery directory %s\n",
401                                 rec_dirname);
402 
403         if (!status)
404                 rec_dir_init = 1;
405         nfs4_reset_creds(original_cred);
406 }
407 
408 void
409 nfsd4_shutdown_recdir(void)
410 {
411         if (!rec_dir_init)
412                 return;
413         rec_dir_init = 0;
414         path_put(&rec_dir);
415 }
416 

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