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 vfs_fsync(NULL, rec_dir.dentry, 0);
126 nfsd4_create_clid_dir(struct nfs4_client *clp)
128 const struct cred *original_cred;
129 char *dname = clp->cl_recdir;
130 struct dentry *dentry;
133 dprintk("NFSD: nfsd4_create_clid_dir for \"%s\"\n", dname);
135 if (!rec_dir_init || clp->cl_firststate)
138 status = nfs4_save_creds(&original_cred);
142 /* lock the parent */
143 mutex_lock(&rec_dir.dentry->d_inode->i_mutex);
145 dentry = lookup_one_len(dname, rec_dir.dentry, HEXDIR_LEN-1);
146 if (IS_ERR(dentry)) {
147 status = PTR_ERR(dentry);
151 if (dentry->d_inode) {
152 dprintk("NFSD: nfsd4_create_clid_dir: DIRECTORY EXISTS\n");
155 status = mnt_want_write(rec_dir.mnt);
158 status = vfs_mkdir(rec_dir.dentry->d_inode, dentry, S_IRWXU);
159 mnt_drop_write(rec_dir.mnt);
163 mutex_unlock(&rec_dir.dentry->d_inode->i_mutex);
165 clp->cl_firststate = 1;
166 nfsd4_sync_rec_dir();
168 nfs4_reset_creds(original_cred);
169 dprintk("NFSD: nfsd4_create_clid_dir returns %d\n", status);
173 typedef int (recdir_func)(struct dentry *, struct dentry *);
176 char name[HEXDIR_LEN];
177 struct list_head list;
181 nfsd4_build_namelist(void *arg, const char *name, int namlen,
182 loff_t offset, u64 ino, unsigned int d_type)
184 struct list_head *names = arg;
185 struct name_list *entry;
187 if (namlen != HEXDIR_LEN - 1)
189 entry = kmalloc(sizeof(struct name_list), GFP_KERNEL);
192 memcpy(entry->name, name, HEXDIR_LEN - 1);
193 entry->name[HEXDIR_LEN - 1] = '\0';
194 list_add(&entry->list, names);
199 nfsd4_list_rec_dir(struct dentry *dir, recdir_func *f)
201 const struct cred *original_cred;
204 struct name_list *entry;
205 struct dentry *dentry;
211 status = nfs4_save_creds(&original_cred);
215 filp = dentry_open(dget(dir), mntget(rec_dir.mnt), O_RDONLY,
217 status = PTR_ERR(filp);
220 status = vfs_readdir(filp, nfsd4_build_namelist, &names);
222 mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_PARENT);
223 while (!list_empty(&names)) {
224 entry = list_entry(names.next, struct name_list, list);
226 dentry = lookup_one_len(entry->name, dir, HEXDIR_LEN-1);
227 if (IS_ERR(dentry)) {
228 status = PTR_ERR(dentry);
231 status = f(dir, dentry);
235 list_del(&entry->list);
238 mutex_unlock(&dir->d_inode->i_mutex);
240 while (!list_empty(&names)) {
241 entry = list_entry(names.next, struct name_list, list);
242 list_del(&entry->list);
245 nfs4_reset_creds(original_cred);
250 nfsd4_unlink_clid_dir(char *name, int namlen)
252 struct dentry *dentry;
255 dprintk("NFSD: nfsd4_unlink_clid_dir. name %.*s\n", namlen, name);
257 mutex_lock_nested(&rec_dir.dentry->d_inode->i_mutex, I_MUTEX_PARENT);
258 dentry = lookup_one_len(name, rec_dir.dentry, namlen);
259 if (IS_ERR(dentry)) {
260 status = PTR_ERR(dentry);
264 if (!dentry->d_inode)
266 status = vfs_rmdir(rec_dir.dentry->d_inode, dentry);
270 mutex_unlock(&rec_dir.dentry->d_inode->i_mutex);
275 nfsd4_remove_clid_dir(struct nfs4_client *clp)
277 const struct cred *original_cred;
280 if (!rec_dir_init || !clp->cl_firststate)
283 status = mnt_want_write(rec_dir.mnt);
286 clp->cl_firststate = 0;
288 status = nfs4_save_creds(&original_cred);
292 status = nfsd4_unlink_clid_dir(clp->cl_recdir, HEXDIR_LEN-1);
293 nfs4_reset_creds(original_cred);
295 nfsd4_sync_rec_dir();
296 mnt_drop_write(rec_dir.mnt);
299 printk("NFSD: Failed to remove expired client state directory"
300 " %.*s\n", HEXDIR_LEN, clp->cl_recdir);
305 purge_old(struct dentry *parent, struct dentry *child)
309 /* note: we currently use this path only for minorversion 0 */
310 if (nfs4_has_reclaimed_state(child->d_name.name, false))
313 status = vfs_rmdir(parent->d_inode, child);
315 printk("failed to remove client recovery directory %s\n",
317 /* Keep trying, success or failure: */
322 nfsd4_recdir_purge_old(void) {
327 status = mnt_want_write(rec_dir.mnt);
330 status = nfsd4_list_rec_dir(rec_dir.dentry, purge_old);
332 nfsd4_sync_rec_dir();
333 mnt_drop_write(rec_dir.mnt);
336 printk("nfsd4: failed to purge old clients from recovery"
337 " directory %s\n", rec_dir.dentry->d_name.name);
341 load_recdir(struct dentry *parent, struct dentry *child)
343 if (child->d_name.len != HEXDIR_LEN - 1) {
344 printk("nfsd4: illegal name %s in recovery directory\n",
346 /* Keep trying; maybe the others are OK: */
349 nfs4_client_to_reclaim(child->d_name.name);
354 nfsd4_recdir_load(void) {
357 status = nfsd4_list_rec_dir(rec_dir.dentry, load_recdir);
359 printk("nfsd4: failed loading clients from recovery"
360 " directory %s\n", rec_dir.dentry->d_name.name);
365 * Hold reference to the recovery directory.
369 nfsd4_init_recdir(char *rec_dirname)
371 const struct cred *original_cred;
374 printk("NFSD: Using %s as the NFSv4 state recovery directory\n",
377 BUG_ON(rec_dir_init);
379 status = nfs4_save_creds(&original_cred);
381 printk("NFSD: Unable to change credentials to find recovery"
382 " directory: error %d\n",
387 status = kern_path(rec_dirname, LOOKUP_FOLLOW | LOOKUP_DIRECTORY,
390 printk("NFSD: unable to find recovery directory %s\n",
395 nfs4_reset_creds(original_cred);
399 nfsd4_shutdown_recdir(void)