blob: 0b3e875d1abd5e4cd962d5ed5df29f22c7ca546d [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
J. Bruce Fields7a6ef8c2012-01-05 15:38:41 -0500120void nfsd4_create_clid_dir(struct nfs4_client *clp)
NeilBrownc7b9a452005-06-23 22:04:30 -0700121{
David Howellsd84f4f92008-11-14 10:39:23 +1100122 const struct cred *original_cred;
NeilBrownc7b9a452005-06-23 22:04:30 -0700123 char *dname = clp->cl_recdir;
Christoph Hellwige970a572010-03-22 17:32:14 +0100124 struct dentry *dir, *dentry;
NeilBrownc7b9a452005-06-23 22:04:30 -0700125 int status;
126
127 dprintk("NFSD: nfsd4_create_clid_dir for \"%s\"\n", dname);
128
J. Bruce Fieldsb8548892012-01-02 17:49:12 -0500129 if (clp->cl_firststate)
J. Bruce Fields7a6ef8c2012-01-05 15:38:41 -0500130 return;
Boaz Harrosh6577aac2011-08-12 17:30:12 -0700131 clp->cl_firststate = 1;
J. Bruce Fieldsb8548892012-01-02 17:49:12 -0500132 if (!rec_file)
J. Bruce Fields7a6ef8c2012-01-05 15:38:41 -0500133 return;
David Howellsd84f4f92008-11-14 10:39:23 +1100134 status = nfs4_save_creds(&original_cred);
135 if (status < 0)
J. Bruce Fields7a6ef8c2012-01-05 15:38:41 -0500136 return;
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 }
Boaz Harrosh6577aac2011-08-12 17:30:12 -0700147 if (dentry->d_inode)
J. Bruce Fieldsaec39682012-01-02 17:30:05 -0500148 /*
149 * In the 4.1 case, where we're called from
150 * reclaim_complete(), records from the previous reboot
151 * may still be left, so this is OK.
152 *
153 * In the 4.0 case, we should never get here; but we may
154 * as well be forgiving and just succeed silently.
155 */
NeilBrownc7b9a452005-06-23 22:04:30 -0700156 goto out_put;
Al Viroa561be72011-11-23 11:57:51 -0500157 status = mnt_want_write_file(rec_file);
Dave Hansen463c3192008-02-15 14:37:57 -0800158 if (status)
159 goto out_put;
Christoph Hellwige970a572010-03-22 17:32:14 +0100160 status = vfs_mkdir(dir->d_inode, dentry, S_IRWXU);
Al Viro2a79f172011-12-09 08:06:57 -0500161 mnt_drop_write_file(rec_file);
NeilBrownc7b9a452005-06-23 22:04:30 -0700162out_put:
163 dput(dentry);
164out_unlock:
Christoph Hellwige970a572010-03-22 17:32:14 +0100165 mutex_unlock(&dir->d_inode->i_mutex);
Boaz Harrosh6577aac2011-08-12 17:30:12 -0700166 if (status == 0)
Christoph Hellwig8018ab02010-03-22 17:32:25 +0100167 vfs_fsync(rec_file, 0);
Boaz Harrosh6577aac2011-08-12 17:30:12 -0700168 else
169 printk(KERN_ERR "NFSD: failed to write recovery record"
170 " (err %d); please check that %s exists"
171 " and is writeable", status,
172 user_recovery_dirname);
David Howellsd84f4f92008-11-14 10:39:23 +1100173 nfs4_reset_creds(original_cred);
NeilBrownc7b9a452005-06-23 22:04:30 -0700174}
175
NeilBrown190e4fb2005-06-23 22:04:25 -0700176typedef int (recdir_func)(struct dentry *, struct dentry *);
177
J. Bruce Fields05f4f672009-03-13 16:02:59 -0400178struct name_list {
179 char name[HEXDIR_LEN];
NeilBrown190e4fb2005-06-23 22:04:25 -0700180 struct list_head list;
181};
182
NeilBrown190e4fb2005-06-23 22:04:25 -0700183static int
J. Bruce Fields05f4f672009-03-13 16:02:59 -0400184nfsd4_build_namelist(void *arg, const char *name, int namlen,
David Howellsafefdbb2006-10-03 01:13:46 -0700185 loff_t offset, u64 ino, unsigned int d_type)
NeilBrown190e4fb2005-06-23 22:04:25 -0700186{
J. Bruce Fields05f4f672009-03-13 16:02:59 -0400187 struct list_head *names = arg;
188 struct name_list *entry;
NeilBrown190e4fb2005-06-23 22:04:25 -0700189
J. Bruce Fields05f4f672009-03-13 16:02:59 -0400190 if (namlen != HEXDIR_LEN - 1)
Al Virob37ad282006-10-19 23:28:59 -0700191 return 0;
J. Bruce Fields05f4f672009-03-13 16:02:59 -0400192 entry = kmalloc(sizeof(struct name_list), GFP_KERNEL);
193 if (entry == NULL)
NeilBrown190e4fb2005-06-23 22:04:25 -0700194 return -ENOMEM;
J. Bruce Fields05f4f672009-03-13 16:02:59 -0400195 memcpy(entry->name, name, HEXDIR_LEN - 1);
196 entry->name[HEXDIR_LEN - 1] = '\0';
197 list_add(&entry->list, names);
NeilBrown190e4fb2005-06-23 22:04:25 -0700198 return 0;
199}
200
201static int
Al Viro5b4b2992011-07-07 18:43:21 -0400202nfsd4_list_rec_dir(recdir_func *f)
NeilBrown190e4fb2005-06-23 22:04:25 -0700203{
David Howellsd84f4f92008-11-14 10:39:23 +1100204 const struct cred *original_cred;
Al Viro5b4b2992011-07-07 18:43:21 -0400205 struct dentry *dir = rec_file->f_path.dentry;
J. Bruce Fields05f4f672009-03-13 16:02:59 -0400206 LIST_HEAD(names);
NeilBrown190e4fb2005-06-23 22:04:25 -0700207 int status;
208
David Howellsd84f4f92008-11-14 10:39:23 +1100209 status = nfs4_save_creds(&original_cred);
210 if (status < 0)
211 return status;
NeilBrown190e4fb2005-06-23 22:04:25 -0700212
Al Viro5b4b2992011-07-07 18:43:21 -0400213 status = vfs_llseek(rec_file, 0, SEEK_SET);
214 if (status < 0) {
215 nfs4_reset_creds(original_cred);
216 return status;
217 }
218
219 status = vfs_readdir(rec_file, nfsd4_build_namelist, &names);
J. Bruce Fields8daed1e2009-05-11 16:10:19 -0400220 mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_PARENT);
J. Bruce Fields05f4f672009-03-13 16:02:59 -0400221 while (!list_empty(&names)) {
Al Viro5b4b2992011-07-07 18:43:21 -0400222 struct name_list *entry;
J. Bruce Fields05f4f672009-03-13 16:02:59 -0400223 entry = list_entry(names.next, struct name_list, list);
Al Viro5b4b2992011-07-07 18:43:21 -0400224 if (!status) {
225 struct dentry *dentry;
226 dentry = lookup_one_len(entry->name, dir, HEXDIR_LEN-1);
227 if (IS_ERR(dentry)) {
228 status = PTR_ERR(dentry);
229 break;
230 }
231 status = f(dir, dentry);
232 dput(dentry);
J. Bruce Fields05f4f672009-03-13 16:02:59 -0400233 }
J. Bruce Fields05f4f672009-03-13 16:02:59 -0400234 list_del(&entry->list);
235 kfree(entry);
NeilBrown190e4fb2005-06-23 22:04:25 -0700236 }
David Woodhouse2f9092e2009-04-20 23:18:37 +0100237 mutex_unlock(&dir->d_inode->i_mutex);
David Howellsd84f4f92008-11-14 10:39:23 +1100238 nfs4_reset_creds(original_cred);
NeilBrown190e4fb2005-06-23 22:04:25 -0700239 return status;
240}
241
242static int
NeilBrownc7b9a452005-06-23 22:04:30 -0700243nfsd4_unlink_clid_dir(char *name, int namlen)
244{
Christoph Hellwige970a572010-03-22 17:32:14 +0100245 struct dentry *dir, *dentry;
NeilBrownc7b9a452005-06-23 22:04:30 -0700246 int status;
247
248 dprintk("NFSD: nfsd4_unlink_clid_dir. name %.*s\n", namlen, name);
249
Christoph Hellwige970a572010-03-22 17:32:14 +0100250 dir = rec_file->f_path.dentry;
251 mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_PARENT);
252 dentry = lookup_one_len(name, dir, namlen);
NeilBrownc7b9a452005-06-23 22:04:30 -0700253 if (IS_ERR(dentry)) {
254 status = PTR_ERR(dentry);
David Woodhouse2f9092e2009-04-20 23:18:37 +0100255 goto out_unlock;
NeilBrownc7b9a452005-06-23 22:04:30 -0700256 }
257 status = -ENOENT;
258 if (!dentry->d_inode)
259 goto out;
Christoph Hellwige970a572010-03-22 17:32:14 +0100260 status = vfs_rmdir(dir->d_inode, dentry);
NeilBrownc7b9a452005-06-23 22:04:30 -0700261out:
262 dput(dentry);
David Woodhouse2f9092e2009-04-20 23:18:37 +0100263out_unlock:
Christoph Hellwige970a572010-03-22 17:32:14 +0100264 mutex_unlock(&dir->d_inode->i_mutex);
NeilBrownc7b9a452005-06-23 22:04:30 -0700265 return status;
266}
267
268void
269nfsd4_remove_clid_dir(struct nfs4_client *clp)
270{
David Howellsd84f4f92008-11-14 10:39:23 +1100271 const struct cred *original_cred;
NeilBrownc7b9a452005-06-23 22:04:30 -0700272 int status;
273
Christoph Hellwige970a572010-03-22 17:32:14 +0100274 if (!rec_file || !clp->cl_firststate)
NeilBrownc7b9a452005-06-23 22:04:30 -0700275 return;
276
Al Viroa561be72011-11-23 11:57:51 -0500277 status = mnt_want_write_file(rec_file);
Dave Hansen06227532008-02-15 14:37:34 -0800278 if (status)
279 goto out;
NeilBrown67be4312005-07-07 17:59:13 -0700280 clp->cl_firststate = 0;
David Howellsd84f4f92008-11-14 10:39:23 +1100281
282 status = nfs4_save_creds(&original_cred);
283 if (status < 0)
284 goto out;
285
NeilBrownc7b9a452005-06-23 22:04:30 -0700286 status = nfsd4_unlink_clid_dir(clp->cl_recdir, HEXDIR_LEN-1);
David Howellsd84f4f92008-11-14 10:39:23 +1100287 nfs4_reset_creds(original_cred);
NeilBrownc7b9a452005-06-23 22:04:30 -0700288 if (status == 0)
Christoph Hellwig8018ab02010-03-22 17:32:25 +0100289 vfs_fsync(rec_file, 0);
Al Viro2a79f172011-12-09 08:06:57 -0500290 mnt_drop_write_file(rec_file);
Dave Hansen06227532008-02-15 14:37:34 -0800291out:
NeilBrownc7b9a452005-06-23 22:04:30 -0700292 if (status)
293 printk("NFSD: Failed to remove expired client state directory"
294 " %.*s\n", HEXDIR_LEN, clp->cl_recdir);
295 return;
296}
297
298static int
299purge_old(struct dentry *parent, struct dentry *child)
300{
301 int status;
302
Andy Adamsona1bcecd2009-04-03 08:28:05 +0300303 if (nfs4_has_reclaimed_state(child->d_name.name, false))
Al Virob37ad282006-10-19 23:28:59 -0700304 return 0;
NeilBrownc7b9a452005-06-23 22:04:30 -0700305
David Woodhouse2f9092e2009-04-20 23:18:37 +0100306 status = vfs_rmdir(parent->d_inode, child);
NeilBrownc7b9a452005-06-23 22:04:30 -0700307 if (status)
308 printk("failed to remove client recovery directory %s\n",
309 child->d_name.name);
310 /* Keep trying, success or failure: */
Al Virob37ad282006-10-19 23:28:59 -0700311 return 0;
NeilBrownc7b9a452005-06-23 22:04:30 -0700312}
313
314void
315nfsd4_recdir_purge_old(void) {
316 int status;
317
Christoph Hellwige970a572010-03-22 17:32:14 +0100318 if (!rec_file)
NeilBrownc7b9a452005-06-23 22:04:30 -0700319 return;
Al Viroa561be72011-11-23 11:57:51 -0500320 status = mnt_want_write_file(rec_file);
Dave Hansen06227532008-02-15 14:37:34 -0800321 if (status)
322 goto out;
Al Viro5b4b2992011-07-07 18:43:21 -0400323 status = nfsd4_list_rec_dir(purge_old);
NeilBrownc7b9a452005-06-23 22:04:30 -0700324 if (status == 0)
Christoph Hellwig8018ab02010-03-22 17:32:25 +0100325 vfs_fsync(rec_file, 0);
Al Viro2a79f172011-12-09 08:06:57 -0500326 mnt_drop_write_file(rec_file);
Dave Hansen06227532008-02-15 14:37:34 -0800327out:
NeilBrownc7b9a452005-06-23 22:04:30 -0700328 if (status)
329 printk("nfsd4: failed to purge old clients from recovery"
Christoph Hellwige970a572010-03-22 17:32:14 +0100330 " directory %s\n", rec_file->f_path.dentry->d_name.name);
NeilBrownc7b9a452005-06-23 22:04:30 -0700331}
332
333static int
NeilBrown190e4fb2005-06-23 22:04:25 -0700334load_recdir(struct dentry *parent, struct dentry *child)
335{
336 if (child->d_name.len != HEXDIR_LEN - 1) {
337 printk("nfsd4: illegal name %s in recovery directory\n",
338 child->d_name.name);
339 /* Keep trying; maybe the others are OK: */
Al Virob37ad282006-10-19 23:28:59 -0700340 return 0;
NeilBrown190e4fb2005-06-23 22:04:25 -0700341 }
342 nfs4_client_to_reclaim(child->d_name.name);
Al Virob37ad282006-10-19 23:28:59 -0700343 return 0;
NeilBrown190e4fb2005-06-23 22:04:25 -0700344}
345
346int
347nfsd4_recdir_load(void) {
348 int status;
349
Christoph Hellwige970a572010-03-22 17:32:14 +0100350 if (!rec_file)
351 return 0;
352
Al Viro5b4b2992011-07-07 18:43:21 -0400353 status = nfsd4_list_rec_dir(load_recdir);
NeilBrown190e4fb2005-06-23 22:04:25 -0700354 if (status)
355 printk("nfsd4: failed loading clients from recovery"
Christoph Hellwige970a572010-03-22 17:32:14 +0100356 " directory %s\n", rec_file->f_path.dentry->d_name.name);
NeilBrown190e4fb2005-06-23 22:04:25 -0700357 return status;
358}
359
360/*
361 * Hold reference to the recovery directory.
362 */
363
364void
J. Bruce Fields48483bf2011-08-26 20:40:28 -0400365nfsd4_init_recdir()
NeilBrown190e4fb2005-06-23 22:04:25 -0700366{
David Howellsd84f4f92008-11-14 10:39:23 +1100367 const struct cred *original_cred;
368 int status;
NeilBrown190e4fb2005-06-23 22:04:25 -0700369
370 printk("NFSD: Using %s as the NFSv4 state recovery directory\n",
J. Bruce Fields48483bf2011-08-26 20:40:28 -0400371 user_recovery_dirname);
NeilBrown190e4fb2005-06-23 22:04:25 -0700372
Christoph Hellwige970a572010-03-22 17:32:14 +0100373 BUG_ON(rec_file);
NeilBrown190e4fb2005-06-23 22:04:25 -0700374
David Howellsd84f4f92008-11-14 10:39:23 +1100375 status = nfs4_save_creds(&original_cred);
376 if (status < 0) {
377 printk("NFSD: Unable to change credentials to find recovery"
378 " directory: error %d\n",
379 status);
380 return;
381 }
NeilBrown190e4fb2005-06-23 22:04:25 -0700382
J. Bruce Fields48483bf2011-08-26 20:40:28 -0400383 rec_file = filp_open(user_recovery_dirname, O_RDONLY | O_DIRECTORY, 0);
Christoph Hellwige970a572010-03-22 17:32:14 +0100384 if (IS_ERR(rec_file)) {
J. Bruce Fieldsc2642ab2006-01-18 17:43:29 -0800385 printk("NFSD: unable to find recovery directory %s\n",
J. Bruce Fields48483bf2011-08-26 20:40:28 -0400386 user_recovery_dirname);
Christoph Hellwige970a572010-03-22 17:32:14 +0100387 rec_file = NULL;
388 }
NeilBrown190e4fb2005-06-23 22:04:25 -0700389
David Howellsd84f4f92008-11-14 10:39:23 +1100390 nfs4_reset_creds(original_cred);
NeilBrown190e4fb2005-06-23 22:04:25 -0700391}
392
393void
394nfsd4_shutdown_recdir(void)
395{
Christoph Hellwige970a572010-03-22 17:32:14 +0100396 if (!rec_file)
NeilBrown190e4fb2005-06-23 22:04:25 -0700397 return;
Christoph Hellwige970a572010-03-22 17:32:14 +0100398 fput(rec_file);
399 rec_file = NULL;
NeilBrown190e4fb2005-06-23 22:04:25 -0700400}
J. Bruce Fields48483bf2011-08-26 20:40:28 -0400401
402/*
403 * Change the NFSv4 recovery directory to recdir.
404 */
405int
406nfs4_reset_recoverydir(char *recdir)
407{
408 int status;
409 struct path path;
410
411 status = kern_path(recdir, LOOKUP_FOLLOW, &path);
412 if (status)
413 return status;
414 status = -ENOTDIR;
415 if (S_ISDIR(path.dentry->d_inode->i_mode)) {
416 strcpy(user_recovery_dirname, recdir);
417 status = 0;
418 }
419 path_put(&path);
420 return status;
421}
422
423char *
424nfs4_recoverydir(void)
425{
426 return user_recovery_dirname;
427}