2 * Copyright (c) 2004 The Regents of the University of Michigan.
5 * Andy Adamson <andros@citi.umich.edu>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the University nor the names of its
17 * contributors may be used to endorse or promote products derived
18 * from this software without specific prior written permission.
20 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
21 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
22 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
23 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
27 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
28 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
29 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
30 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34 #include <linux/file.h>
35 #include <linux/namei.h>
36 #include <linux/crypto.h>
37 #include <linux/sched.h>
43 #define NFSDDBG_FACILITY NFSDDBG_PROC
46 static struct path rec_dir;
47 static int rec_dir_init = 0;
50 nfs4_save_creds(const struct cred **original_creds)
54 new = prepare_creds();
60 *original_creds = override_creds(new);
66 nfs4_reset_creds(const struct cred *original)
68 revert_creds(original);
72 md5_to_hex(char *out, char *md5)
76 for (i=0; i<16; i++) {
77 unsigned char c = md5[i];
79 *out++ = '0' + ((c&0xf0)>>4) + (c>=0xa0)*('a'-'9'-1);
80 *out++ = '0' + (c&0x0f) + ((c&0x0f)>=0x0a)*('a'-'9'-1);
86 nfs4_make_rec_clidname(char *dname, struct xdr_netobj *clname)
88 struct xdr_netobj cksum;
89 struct hash_desc desc;
90 struct scatterlist sg;
91 __be32 status = nfserr_resource;
93 dprintk("NFSD: nfs4_make_rec_clidname for %.*s\n",
94 clname->len, clname->data);
95 desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP;
96 desc.tfm = crypto_alloc_hash("md5", 0, CRYPTO_ALG_ASYNC);
99 cksum.len = crypto_hash_digestsize(desc.tfm);
100 cksum.data = kmalloc(cksum.len, GFP_KERNEL);
101 if (cksum.data == NULL)
104 sg_init_one(&sg, clname->data, clname->len);
106 if (crypto_hash_digest(&desc, &sg, sg.length, cksum.data))
109 md5_to_hex(dname, cksum.data);
114 crypto_free_hash(desc.tfm);
120 nfsd4_sync_rec_dir(void)
122 mutex_lock(&rec_dir.dentry->d_inode->i_mutex);
123 nfsd_sync_dir(rec_dir.dentry);
124 mutex_unlock(&rec_dir.dentry->d_inode->i_mutex);
128 nfsd4_create_clid_dir(struct nfs4_client *clp)
130 const struct cred *original_cred;
131 char *dname = clp->cl_recdir;
132 struct dentry *dentry;
135 dprintk("NFSD: nfsd4_create_clid_dir for \"%s\"\n", dname);
137 if (!rec_dir_init || clp->cl_firststate)
140 status = nfs4_save_creds(&original_cred);
144 /* lock the parent */
145 mutex_lock(&rec_dir.dentry->d_inode->i_mutex);
147 dentry = lookup_one_len(dname, rec_dir.dentry, HEXDIR_LEN-1);
148 if (IS_ERR(dentry)) {
149 status = PTR_ERR(dentry);
153 if (dentry->d_inode) {
154 dprintk("NFSD: nfsd4_create_clid_dir: DIRECTORY EXISTS\n");
157 status = mnt_want_write(rec_dir.mnt);
160 status = vfs_mkdir(rec_dir.dentry->d_inode, dentry, S_IRWXU);
161 mnt_drop_write(rec_dir.mnt);
165 mutex_unlock(&rec_dir.dentry->d_inode->i_mutex);
167 clp->cl_firststate = 1;
168 nfsd4_sync_rec_dir();
170 nfs4_reset_creds(original_cred);
171 dprintk("NFSD: nfsd4_create_clid_dir returns %d\n", status);
175 typedef int (recdir_func)(struct dentry *, struct dentry *);
178 char name[HEXDIR_LEN];
179 struct list_head list;
183 nfsd4_build_namelist(void *arg, const char *name, int namlen,
184 loff_t offset, u64 ino, unsigned int d_type)
186 struct list_head *names = arg;
187 struct name_list *entry;
189 if (namlen != HEXDIR_LEN - 1)
191 entry = kmalloc(sizeof(struct name_list), GFP_KERNEL);
194 memcpy(entry->name, name, HEXDIR_LEN - 1);
195 entry->name[HEXDIR_LEN - 1] = '\0';
196 list_add(&entry->list, names);
201 nfsd4_list_rec_dir(struct dentry *dir, recdir_func *f)
203 const struct cred *original_cred;
206 struct name_list *entry;
207 struct dentry *dentry;
213 status = nfs4_save_creds(&original_cred);
217 filp = dentry_open(dget(dir), mntget(rec_dir.mnt), O_RDONLY,
219 status = PTR_ERR(filp);
222 status = vfs_readdir(filp, nfsd4_build_namelist, &names);
224 mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_PARENT);
225 while (!list_empty(&names)) {
226 entry = list_entry(names.next, struct name_list, list);
228 dentry = lookup_one_len(entry->name, dir, HEXDIR_LEN-1);
229 if (IS_ERR(dentry)) {
230 status = PTR_ERR(dentry);
233 status = f(dir, dentry);
237 list_del(&entry->list);
240 mutex_unlock(&dir->d_inode->i_mutex);
242 while (!list_empty(&names)) {
243 entry = list_entry(names.next, struct name_list, list);
244 list_del(&entry->list);
247 nfs4_reset_creds(original_cred);
252 nfsd4_unlink_clid_dir(char *name, int namlen)
254 struct dentry *dentry;
257 dprintk("NFSD: nfsd4_unlink_clid_dir. name %.*s\n", namlen, name);
259 mutex_lock_nested(&rec_dir.dentry->d_inode->i_mutex, I_MUTEX_PARENT);
260 dentry = lookup_one_len(name, rec_dir.dentry, namlen);
261 if (IS_ERR(dentry)) {
262 status = PTR_ERR(dentry);
266 if (!dentry->d_inode)
268 status = vfs_rmdir(rec_dir.dentry->d_inode, dentry);
272 mutex_unlock(&rec_dir.dentry->d_inode->i_mutex);
277 nfsd4_remove_clid_dir(struct nfs4_client *clp)
279 const struct cred *original_cred;
282 if (!rec_dir_init || !clp->cl_firststate)
285 status = mnt_want_write(rec_dir.mnt);
288 clp->cl_firststate = 0;
290 status = nfs4_save_creds(&original_cred);
294 status = nfsd4_unlink_clid_dir(clp->cl_recdir, HEXDIR_LEN-1);
295 nfs4_reset_creds(original_cred);
297 nfsd4_sync_rec_dir();
298 mnt_drop_write(rec_dir.mnt);
301 printk("NFSD: Failed to remove expired client state directory"
302 " %.*s\n", HEXDIR_LEN, clp->cl_recdir);
307 purge_old(struct dentry *parent, struct dentry *child)
311 /* note: we currently use this path only for minorversion 0 */
312 if (nfs4_has_reclaimed_state(child->d_name.name, false))
315 status = vfs_rmdir(parent->d_inode, child);
317 printk("failed to remove client recovery directory %s\n",
319 /* Keep trying, success or failure: */
324 nfsd4_recdir_purge_old(void) {
329 status = mnt_want_write(rec_dir.mnt);
332 status = nfsd4_list_rec_dir(rec_dir.dentry, purge_old);
334 nfsd4_sync_rec_dir();
335 mnt_drop_write(rec_dir.mnt);
338 printk("nfsd4: failed to purge old clients from recovery"
339 " directory %s\n", rec_dir.dentry->d_name.name);
343 load_recdir(struct dentry *parent, struct dentry *child)
345 if (child->d_name.len != HEXDIR_LEN - 1) {
346 printk("nfsd4: illegal name %s in recovery directory\n",
348 /* Keep trying; maybe the others are OK: */
351 nfs4_client_to_reclaim(child->d_name.name);
356 nfsd4_recdir_load(void) {
359 status = nfsd4_list_rec_dir(rec_dir.dentry, load_recdir);
361 printk("nfsd4: failed loading clients from recovery"
362 " directory %s\n", rec_dir.dentry->d_name.name);
367 * Hold reference to the recovery directory.
371 nfsd4_init_recdir(char *rec_dirname)
373 const struct cred *original_cred;
376 printk("NFSD: Using %s as the NFSv4 state recovery directory\n",
379 BUG_ON(rec_dir_init);
381 status = nfs4_save_creds(&original_cred);
383 printk("NFSD: Unable to change credentials to find recovery"
384 " directory: error %d\n",
389 status = kern_path(rec_dirname, LOOKUP_FOLLOW | LOOKUP_DIRECTORY,
392 printk("NFSD: unable to find recovery directory %s\n",
397 nfs4_reset_creds(original_cred);
401 nfsd4_shutdown_recdir(void)