blob: 80a0be9ed008a6db484d81303379d0a599c5dad7 [file] [log] [blame]
NeilBrowna55370a2005-06-23 22:03:52 -07001/*
NeilBrowna55370a2005-06-23 22:03:52 -07002* Copyright (c) 2004 The Regents of the University of Michigan.
3* All rights reserved.
4*
5* Andy Adamson <andros@citi.umich.edu>
6*
7* Redistribution and use in source and binary forms, with or without
8* modification, are permitted provided that the following conditions
9* are met:
10*
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.
19*
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.
31*
32*/
33
NeilBrown190e4fb2005-06-23 22:04:25 -070034#include <linux/file.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090035#include <linux/slab.h>
NeilBrown190e4fb2005-06-23 22:04:25 -070036#include <linux/namei.h>
NeilBrowna55370a2005-06-23 22:03:52 -070037#include <linux/crypto.h>
Alexey Dobriyane8edc6e2007-05-21 01:22:52 +040038#include <linux/sched.h>
Boaz Harrosh9a74af22009-12-03 20:30:56 +020039
40#include "nfsd.h"
41#include "state.h"
J. Bruce Fields0a3adad2009-11-04 18:12:35 -050042#include "vfs.h"
NeilBrowna55370a2005-06-23 22:03:52 -070043
44#define NFSDDBG_FACILITY NFSDDBG_PROC
45
NeilBrown190e4fb2005-06-23 22:04:25 -070046/* Globals */
Christoph Hellwige970a572010-03-22 17:32:14 +010047static struct file *rec_file;
J. Bruce Fields48483bf2011-08-26 20:40:28 -040048static char user_recovery_dirname[PATH_MAX] = "/var/lib/nfs/v4recovery";
NeilBrown190e4fb2005-06-23 22:04:25 -070049
David Howellsd84f4f92008-11-14 10:39:23 +110050static int
51nfs4_save_creds(const struct cred **original_creds)
NeilBrown190e4fb2005-06-23 22:04:25 -070052{
David Howellsd84f4f92008-11-14 10:39:23 +110053 struct cred *new;
54
55 new = prepare_creds();
56 if (!new)
57 return -ENOMEM;
58
59 new->fsuid = 0;
60 new->fsgid = 0;
61 *original_creds = override_creds(new);
62 put_cred(new);
63 return 0;
NeilBrown190e4fb2005-06-23 22:04:25 -070064}
65
66static void
David Howellsd84f4f92008-11-14 10:39:23 +110067nfs4_reset_creds(const struct cred *original)
NeilBrown190e4fb2005-06-23 22:04:25 -070068{
David Howellsd84f4f92008-11-14 10:39:23 +110069 revert_creds(original);
NeilBrown190e4fb2005-06-23 22:04:25 -070070}
71
NeilBrowna55370a2005-06-23 22:03:52 -070072static void
73md5_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
Al Virob37ad282006-10-19 23:28:59 -070086__be32
NeilBrowna55370a2005-06-23 22:03:52 -070087nfs4_make_rec_clidname(char *dname, struct xdr_netobj *clname)
88{
89 struct xdr_netobj cksum;
Herbert Xu35058682006-08-24 19:10:20 +100090 struct hash_desc desc;
Jens Axboe60c74f82007-10-22 19:43:30 +020091 struct scatterlist sg;
J. Bruce Fields3e772462011-08-10 19:07:33 -040092 __be32 status = nfserr_jukebox;
NeilBrowna55370a2005-06-23 22:03:52 -070093
94 dprintk("NFSD: nfs4_make_rec_clidname for %.*s\n",
95 clname->len, clname->data);
Herbert Xu35058682006-08-24 19:10:20 +100096 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);
NeilBrowna55370a2005-06-23 22:03:52 -0700101 cksum.data = kmalloc(cksum.len, GFP_KERNEL);
102 if (cksum.data == NULL)
103 goto out;
NeilBrowna55370a2005-06-23 22:03:52 -0700104
Jens Axboe60c74f82007-10-22 19:43:30 +0200105 sg_init_one(&sg, clname->data, clname->len);
NeilBrowna55370a2005-06-23 22:03:52 -0700106
Jens Axboe60c74f82007-10-22 19:43:30 +0200107 if (crypto_hash_digest(&desc, &sg, sg.length, cksum.data))
Herbert Xu35058682006-08-24 19:10:20 +1000108 goto out;
NeilBrowna55370a2005-06-23 22:03:52 -0700109
110 md5_to_hex(dname, cksum.data);
111
NeilBrowna55370a2005-06-23 22:03:52 -0700112 status = nfs_ok;
113out:
Krishna Kumar2bd9e7b2008-10-20 11:47:09 +0530114 kfree(cksum.data);
Herbert Xu35058682006-08-24 19:10:20 +1000115 crypto_free_hash(desc.tfm);
116out_no_tfm:
NeilBrowna55370a2005-06-23 22:03:52 -0700117 return status;
118}
NeilBrown190e4fb2005-06-23 22:04:25 -0700119
NeilBrownc7b9a452005-06-23 22:04:30 -0700120int
121nfsd4_create_clid_dir(struct nfs4_client *clp)
122{
David Howellsd84f4f92008-11-14 10:39:23 +1100123 const struct cred *original_cred;
NeilBrownc7b9a452005-06-23 22:04:30 -0700124 char *dname = clp->cl_recdir;
Christoph Hellwige970a572010-03-22 17:32:14 +0100125 struct dentry *dir, *dentry;
NeilBrownc7b9a452005-06-23 22:04:30 -0700126 int status;
127
128 dprintk("NFSD: nfsd4_create_clid_dir for \"%s\"\n", dname);
129
Christoph Hellwige970a572010-03-22 17:32:14 +0100130 if (!rec_file || clp->cl_firststate)
NeilBrownc7b9a452005-06-23 22:04:30 -0700131 return 0;
132
Boaz Harrosh6577aac2011-08-12 17:30:12 -0700133 clp->cl_firststate = 1;
David Howellsd84f4f92008-11-14 10:39:23 +1100134 status = nfs4_save_creds(&original_cred);
135 if (status < 0)
136 return status;
NeilBrownc7b9a452005-06-23 22:04:30 -0700137
Christoph Hellwige970a572010-03-22 17:32:14 +0100138 dir = rec_file->f_path.dentry;
NeilBrownc7b9a452005-06-23 22:04:30 -0700139 /* lock the parent */
Christoph Hellwige970a572010-03-22 17:32:14 +0100140 mutex_lock(&dir->d_inode->i_mutex);
NeilBrownc7b9a452005-06-23 22:04:30 -0700141
Christoph Hellwige970a572010-03-22 17:32:14 +0100142 dentry = lookup_one_len(dname, dir, HEXDIR_LEN-1);
NeilBrownc7b9a452005-06-23 22:04:30 -0700143 if (IS_ERR(dentry)) {
144 status = PTR_ERR(dentry);
145 goto out_unlock;
146 }
147 status = -EEXIST;
Boaz Harrosh6577aac2011-08-12 17:30:12 -0700148 if (dentry->d_inode)
NeilBrownc7b9a452005-06-23 22:04:30 -0700149 goto out_put;
Al Viroa561be72011-11-23 11:57:51 -0500150 status = mnt_want_write_file(rec_file);
Dave Hansen463c3192008-02-15 14:37:57 -0800151 if (status)
152 goto out_put;
Christoph Hellwige970a572010-03-22 17:32:14 +0100153 status = vfs_mkdir(dir->d_inode, dentry, S_IRWXU);
Al Viro2a79f172011-12-09 08:06:57 -0500154 mnt_drop_write_file(rec_file);
NeilBrownc7b9a452005-06-23 22:04:30 -0700155out_put:
156 dput(dentry);
157out_unlock:
Christoph Hellwige970a572010-03-22 17:32:14 +0100158 mutex_unlock(&dir->d_inode->i_mutex);
Boaz Harrosh6577aac2011-08-12 17:30:12 -0700159 if (status == 0)
Christoph Hellwig8018ab02010-03-22 17:32:25 +0100160 vfs_fsync(rec_file, 0);
Boaz Harrosh6577aac2011-08-12 17:30:12 -0700161 else
162 printk(KERN_ERR "NFSD: failed to write recovery record"
163 " (err %d); please check that %s exists"
164 " and is writeable", status,
165 user_recovery_dirname);
David Howellsd84f4f92008-11-14 10:39:23 +1100166 nfs4_reset_creds(original_cred);
NeilBrownc7b9a452005-06-23 22:04:30 -0700167 return status;
168}
169
NeilBrown190e4fb2005-06-23 22:04:25 -0700170typedef int (recdir_func)(struct dentry *, struct dentry *);
171
J. Bruce Fields05f4f672009-03-13 16:02:59 -0400172struct name_list {
173 char name[HEXDIR_LEN];
NeilBrown190e4fb2005-06-23 22:04:25 -0700174 struct list_head list;
175};
176
NeilBrown190e4fb2005-06-23 22:04:25 -0700177static int
J. Bruce Fields05f4f672009-03-13 16:02:59 -0400178nfsd4_build_namelist(void *arg, const char *name, int namlen,
David Howellsafefdbb2006-10-03 01:13:46 -0700179 loff_t offset, u64 ino, unsigned int d_type)
NeilBrown190e4fb2005-06-23 22:04:25 -0700180{
J. Bruce Fields05f4f672009-03-13 16:02:59 -0400181 struct list_head *names = arg;
182 struct name_list *entry;
NeilBrown190e4fb2005-06-23 22:04:25 -0700183
J. Bruce Fields05f4f672009-03-13 16:02:59 -0400184 if (namlen != HEXDIR_LEN - 1)
Al Virob37ad282006-10-19 23:28:59 -0700185 return 0;
J. Bruce Fields05f4f672009-03-13 16:02:59 -0400186 entry = kmalloc(sizeof(struct name_list), GFP_KERNEL);
187 if (entry == NULL)
NeilBrown190e4fb2005-06-23 22:04:25 -0700188 return -ENOMEM;
J. Bruce Fields05f4f672009-03-13 16:02:59 -0400189 memcpy(entry->name, name, HEXDIR_LEN - 1);
190 entry->name[HEXDIR_LEN - 1] = '\0';
191 list_add(&entry->list, names);
NeilBrown190e4fb2005-06-23 22:04:25 -0700192 return 0;
193}
194
195static int
Al Viro5b4b2992011-07-07 18:43:21 -0400196nfsd4_list_rec_dir(recdir_func *f)
NeilBrown190e4fb2005-06-23 22:04:25 -0700197{
David Howellsd84f4f92008-11-14 10:39:23 +1100198 const struct cred *original_cred;
Al Viro5b4b2992011-07-07 18:43:21 -0400199 struct dentry *dir = rec_file->f_path.dentry;
J. Bruce Fields05f4f672009-03-13 16:02:59 -0400200 LIST_HEAD(names);
NeilBrown190e4fb2005-06-23 22:04:25 -0700201 int status;
202
David Howellsd84f4f92008-11-14 10:39:23 +1100203 status = nfs4_save_creds(&original_cred);
204 if (status < 0)
205 return status;
NeilBrown190e4fb2005-06-23 22:04:25 -0700206
Al Viro5b4b2992011-07-07 18:43:21 -0400207 status = vfs_llseek(rec_file, 0, SEEK_SET);
208 if (status < 0) {
209 nfs4_reset_creds(original_cred);
210 return status;
211 }
212
213 status = vfs_readdir(rec_file, nfsd4_build_namelist, &names);
J. Bruce Fields8daed1e2009-05-11 16:10:19 -0400214 mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_PARENT);
J. Bruce Fields05f4f672009-03-13 16:02:59 -0400215 while (!list_empty(&names)) {
Al Viro5b4b2992011-07-07 18:43:21 -0400216 struct name_list *entry;
J. Bruce Fields05f4f672009-03-13 16:02:59 -0400217 entry = list_entry(names.next, struct name_list, list);
Al Viro5b4b2992011-07-07 18:43:21 -0400218 if (!status) {
219 struct dentry *dentry;
220 dentry = lookup_one_len(entry->name, dir, HEXDIR_LEN-1);
221 if (IS_ERR(dentry)) {
222 status = PTR_ERR(dentry);
223 break;
224 }
225 status = f(dir, dentry);
226 dput(dentry);
J. Bruce Fields05f4f672009-03-13 16:02:59 -0400227 }
J. Bruce Fields05f4f672009-03-13 16:02:59 -0400228 list_del(&entry->list);
229 kfree(entry);
NeilBrown190e4fb2005-06-23 22:04:25 -0700230 }
David Woodhouse2f9092e2009-04-20 23:18:37 +0100231 mutex_unlock(&dir->d_inode->i_mutex);
David Howellsd84f4f92008-11-14 10:39:23 +1100232 nfs4_reset_creds(original_cred);
NeilBrown190e4fb2005-06-23 22:04:25 -0700233 return status;
234}
235
236static int
NeilBrownc7b9a452005-06-23 22:04:30 -0700237nfsd4_unlink_clid_dir(char *name, int namlen)
238{
Christoph Hellwige970a572010-03-22 17:32:14 +0100239 struct dentry *dir, *dentry;
NeilBrownc7b9a452005-06-23 22:04:30 -0700240 int status;
241
242 dprintk("NFSD: nfsd4_unlink_clid_dir. name %.*s\n", namlen, name);
243
Christoph Hellwige970a572010-03-22 17:32:14 +0100244 dir = rec_file->f_path.dentry;
245 mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_PARENT);
246 dentry = lookup_one_len(name, dir, namlen);
NeilBrownc7b9a452005-06-23 22:04:30 -0700247 if (IS_ERR(dentry)) {
248 status = PTR_ERR(dentry);
David Woodhouse2f9092e2009-04-20 23:18:37 +0100249 goto out_unlock;
NeilBrownc7b9a452005-06-23 22:04:30 -0700250 }
251 status = -ENOENT;
252 if (!dentry->d_inode)
253 goto out;
Christoph Hellwige970a572010-03-22 17:32:14 +0100254 status = vfs_rmdir(dir->d_inode, dentry);
NeilBrownc7b9a452005-06-23 22:04:30 -0700255out:
256 dput(dentry);
David Woodhouse2f9092e2009-04-20 23:18:37 +0100257out_unlock:
Christoph Hellwige970a572010-03-22 17:32:14 +0100258 mutex_unlock(&dir->d_inode->i_mutex);
NeilBrownc7b9a452005-06-23 22:04:30 -0700259 return status;
260}
261
262void
263nfsd4_remove_clid_dir(struct nfs4_client *clp)
264{
David Howellsd84f4f92008-11-14 10:39:23 +1100265 const struct cred *original_cred;
NeilBrownc7b9a452005-06-23 22:04:30 -0700266 int status;
267
Christoph Hellwige970a572010-03-22 17:32:14 +0100268 if (!rec_file || !clp->cl_firststate)
NeilBrownc7b9a452005-06-23 22:04:30 -0700269 return;
270
Al Viroa561be72011-11-23 11:57:51 -0500271 status = mnt_want_write_file(rec_file);
Dave Hansen06227532008-02-15 14:37:34 -0800272 if (status)
273 goto out;
NeilBrown67be4312005-07-07 17:59:13 -0700274 clp->cl_firststate = 0;
David Howellsd84f4f92008-11-14 10:39:23 +1100275
276 status = nfs4_save_creds(&original_cred);
277 if (status < 0)
278 goto out;
279
NeilBrownc7b9a452005-06-23 22:04:30 -0700280 status = nfsd4_unlink_clid_dir(clp->cl_recdir, HEXDIR_LEN-1);
David Howellsd84f4f92008-11-14 10:39:23 +1100281 nfs4_reset_creds(original_cred);
NeilBrownc7b9a452005-06-23 22:04:30 -0700282 if (status == 0)
Christoph Hellwig8018ab02010-03-22 17:32:25 +0100283 vfs_fsync(rec_file, 0);
Al Viro2a79f172011-12-09 08:06:57 -0500284 mnt_drop_write_file(rec_file);
Dave Hansen06227532008-02-15 14:37:34 -0800285out:
NeilBrownc7b9a452005-06-23 22:04:30 -0700286 if (status)
287 printk("NFSD: Failed to remove expired client state directory"
288 " %.*s\n", HEXDIR_LEN, clp->cl_recdir);
289 return;
290}
291
292static int
293purge_old(struct dentry *parent, struct dentry *child)
294{
295 int status;
296
Andy Adamsona1bcecd2009-04-03 08:28:05 +0300297 if (nfs4_has_reclaimed_state(child->d_name.name, false))
Al Virob37ad282006-10-19 23:28:59 -0700298 return 0;
NeilBrownc7b9a452005-06-23 22:04:30 -0700299
David Woodhouse2f9092e2009-04-20 23:18:37 +0100300 status = vfs_rmdir(parent->d_inode, child);
NeilBrownc7b9a452005-06-23 22:04:30 -0700301 if (status)
302 printk("failed to remove client recovery directory %s\n",
303 child->d_name.name);
304 /* Keep trying, success or failure: */
Al Virob37ad282006-10-19 23:28:59 -0700305 return 0;
NeilBrownc7b9a452005-06-23 22:04:30 -0700306}
307
308void
309nfsd4_recdir_purge_old(void) {
310 int status;
311
Christoph Hellwige970a572010-03-22 17:32:14 +0100312 if (!rec_file)
NeilBrownc7b9a452005-06-23 22:04:30 -0700313 return;
Al Viroa561be72011-11-23 11:57:51 -0500314 status = mnt_want_write_file(rec_file);
Dave Hansen06227532008-02-15 14:37:34 -0800315 if (status)
316 goto out;
Al Viro5b4b2992011-07-07 18:43:21 -0400317 status = nfsd4_list_rec_dir(purge_old);
NeilBrownc7b9a452005-06-23 22:04:30 -0700318 if (status == 0)
Christoph Hellwig8018ab02010-03-22 17:32:25 +0100319 vfs_fsync(rec_file, 0);
Al Viro2a79f172011-12-09 08:06:57 -0500320 mnt_drop_write_file(rec_file);
Dave Hansen06227532008-02-15 14:37:34 -0800321out:
NeilBrownc7b9a452005-06-23 22:04:30 -0700322 if (status)
323 printk("nfsd4: failed to purge old clients from recovery"
Christoph Hellwige970a572010-03-22 17:32:14 +0100324 " directory %s\n", rec_file->f_path.dentry->d_name.name);
NeilBrownc7b9a452005-06-23 22:04:30 -0700325}
326
327static int
NeilBrown190e4fb2005-06-23 22:04:25 -0700328load_recdir(struct dentry *parent, struct dentry *child)
329{
330 if (child->d_name.len != HEXDIR_LEN - 1) {
331 printk("nfsd4: illegal name %s in recovery directory\n",
332 child->d_name.name);
333 /* Keep trying; maybe the others are OK: */
Al Virob37ad282006-10-19 23:28:59 -0700334 return 0;
NeilBrown190e4fb2005-06-23 22:04:25 -0700335 }
336 nfs4_client_to_reclaim(child->d_name.name);
Al Virob37ad282006-10-19 23:28:59 -0700337 return 0;
NeilBrown190e4fb2005-06-23 22:04:25 -0700338}
339
340int
341nfsd4_recdir_load(void) {
342 int status;
343
Christoph Hellwige970a572010-03-22 17:32:14 +0100344 if (!rec_file)
345 return 0;
346
Al Viro5b4b2992011-07-07 18:43:21 -0400347 status = nfsd4_list_rec_dir(load_recdir);
NeilBrown190e4fb2005-06-23 22:04:25 -0700348 if (status)
349 printk("nfsd4: failed loading clients from recovery"
Christoph Hellwige970a572010-03-22 17:32:14 +0100350 " directory %s\n", rec_file->f_path.dentry->d_name.name);
NeilBrown190e4fb2005-06-23 22:04:25 -0700351 return status;
352}
353
354/*
355 * Hold reference to the recovery directory.
356 */
357
358void
J. Bruce Fields48483bf2011-08-26 20:40:28 -0400359nfsd4_init_recdir()
NeilBrown190e4fb2005-06-23 22:04:25 -0700360{
David Howellsd84f4f92008-11-14 10:39:23 +1100361 const struct cred *original_cred;
362 int status;
NeilBrown190e4fb2005-06-23 22:04:25 -0700363
364 printk("NFSD: Using %s as the NFSv4 state recovery directory\n",
J. Bruce Fields48483bf2011-08-26 20:40:28 -0400365 user_recovery_dirname);
NeilBrown190e4fb2005-06-23 22:04:25 -0700366
Christoph Hellwige970a572010-03-22 17:32:14 +0100367 BUG_ON(rec_file);
NeilBrown190e4fb2005-06-23 22:04:25 -0700368
David Howellsd84f4f92008-11-14 10:39:23 +1100369 status = nfs4_save_creds(&original_cred);
370 if (status < 0) {
371 printk("NFSD: Unable to change credentials to find recovery"
372 " directory: error %d\n",
373 status);
374 return;
375 }
NeilBrown190e4fb2005-06-23 22:04:25 -0700376
J. Bruce Fields48483bf2011-08-26 20:40:28 -0400377 rec_file = filp_open(user_recovery_dirname, O_RDONLY | O_DIRECTORY, 0);
Christoph Hellwige970a572010-03-22 17:32:14 +0100378 if (IS_ERR(rec_file)) {
J. Bruce Fieldsc2642ab2006-01-18 17:43:29 -0800379 printk("NFSD: unable to find recovery directory %s\n",
J. Bruce Fields48483bf2011-08-26 20:40:28 -0400380 user_recovery_dirname);
Christoph Hellwige970a572010-03-22 17:32:14 +0100381 rec_file = NULL;
382 }
NeilBrown190e4fb2005-06-23 22:04:25 -0700383
David Howellsd84f4f92008-11-14 10:39:23 +1100384 nfs4_reset_creds(original_cred);
NeilBrown190e4fb2005-06-23 22:04:25 -0700385}
386
387void
388nfsd4_shutdown_recdir(void)
389{
Christoph Hellwige970a572010-03-22 17:32:14 +0100390 if (!rec_file)
NeilBrown190e4fb2005-06-23 22:04:25 -0700391 return;
Christoph Hellwige970a572010-03-22 17:32:14 +0100392 fput(rec_file);
393 rec_file = NULL;
NeilBrown190e4fb2005-06-23 22:04:25 -0700394}
J. Bruce Fields48483bf2011-08-26 20:40:28 -0400395
396/*
397 * Change the NFSv4 recovery directory to recdir.
398 */
399int
400nfs4_reset_recoverydir(char *recdir)
401{
402 int status;
403 struct path path;
404
405 status = kern_path(recdir, LOOKUP_FOLLOW, &path);
406 if (status)
407 return status;
408 status = -ENOTDIR;
409 if (S_ISDIR(path.dentry->d_inode->i_mode)) {
410 strcpy(user_recovery_dirname, recdir);
411 status = 0;
412 }
413 path_put(&path);
414 return status;
415}
416
417char *
418nfs4_recoverydir(void)
419{
420 return user_recovery_dirname;
421}