blob: e0a65a9e37e97ac1a8702a48487349d599be4aab [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.
Jeff Laytonf3f80142012-03-21 09:52:07 -04003* Copyright (c) 2012 Jeff Layton <jlayton@redhat.com>
NeilBrowna55370a2005-06-23 22:03:52 -07004* All rights reserved.
5*
6* Andy Adamson <andros@citi.umich.edu>
7*
8* Redistribution and use in source and binary forms, with or without
9* modification, are permitted provided that the following conditions
10* are met:
11*
12* 1. Redistributions of source code must retain the above copyright
13* notice, this list of conditions and the following disclaimer.
14* 2. Redistributions in binary form must reproduce the above copyright
15* notice, this list of conditions and the following disclaimer in the
16* documentation and/or other materials provided with the distribution.
17* 3. Neither the name of the University nor the names of its
18* contributors may be used to endorse or promote products derived
19* from this software without specific prior written permission.
20*
21* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
22* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
23* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
24* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
26* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
27* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
28* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
29* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
30* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
31* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32*
33*/
34
NeilBrown190e4fb2005-06-23 22:04:25 -070035#include <linux/file.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090036#include <linux/slab.h>
NeilBrown190e4fb2005-06-23 22:04:25 -070037#include <linux/namei.h>
NeilBrowna55370a2005-06-23 22:03:52 -070038#include <linux/crypto.h>
Alexey Dobriyane8edc6e2007-05-21 01:22:52 +040039#include <linux/sched.h>
Jeff Laytonf3f80142012-03-21 09:52:07 -040040#include <linux/fs.h>
Jeff Layton813fd322012-03-21 09:52:08 -040041#include <linux/module.h>
Jeff Laytonf3f80142012-03-21 09:52:07 -040042#include <net/net_namespace.h>
43#include <linux/sunrpc/rpc_pipe_fs.h>
44#include <linux/sunrpc/clnt.h>
45#include <linux/nfsd/cld.h>
Boaz Harrosh9a74af22009-12-03 20:30:56 +020046
47#include "nfsd.h"
48#include "state.h"
J. Bruce Fields0a3adad2009-11-04 18:12:35 -050049#include "vfs.h"
Jeff Laytonf3f80142012-03-21 09:52:07 -040050#include "netns.h"
NeilBrowna55370a2005-06-23 22:03:52 -070051
52#define NFSDDBG_FACILITY NFSDDBG_PROC
53
Jeff Layton2a4317c2012-03-21 16:42:43 -040054/* Declarations */
55struct nfsd4_client_tracking_ops {
56 int (*init)(struct net *);
57 void (*exit)(struct net *);
58 void (*create)(struct nfs4_client *);
59 void (*remove)(struct nfs4_client *);
60 int (*check)(struct nfs4_client *);
Stanislav Kinsbursky12760c62012-11-14 18:22:12 +030061 void (*grace_done)(struct nfsd_net *, time_t);
Jeff Layton2a4317c2012-03-21 16:42:43 -040062};
63
NeilBrown190e4fb2005-06-23 22:04:25 -070064/* Globals */
J. Bruce Fields48483bf2011-08-26 20:40:28 -040065static char user_recovery_dirname[PATH_MAX] = "/var/lib/nfs/v4recovery";
NeilBrown190e4fb2005-06-23 22:04:25 -070066
David Howellsd84f4f92008-11-14 10:39:23 +110067static int
68nfs4_save_creds(const struct cred **original_creds)
NeilBrown190e4fb2005-06-23 22:04:25 -070069{
David Howellsd84f4f92008-11-14 10:39:23 +110070 struct cred *new;
71
72 new = prepare_creds();
73 if (!new)
74 return -ENOMEM;
75
Eric W. Biederman6fab8772013-02-02 06:53:11 -080076 new->fsuid = GLOBAL_ROOT_UID;
77 new->fsgid = GLOBAL_ROOT_GID;
David Howellsd84f4f92008-11-14 10:39:23 +110078 *original_creds = override_creds(new);
79 put_cred(new);
80 return 0;
NeilBrown190e4fb2005-06-23 22:04:25 -070081}
82
83static void
David Howellsd84f4f92008-11-14 10:39:23 +110084nfs4_reset_creds(const struct cred *original)
NeilBrown190e4fb2005-06-23 22:04:25 -070085{
David Howellsd84f4f92008-11-14 10:39:23 +110086 revert_creds(original);
NeilBrown190e4fb2005-06-23 22:04:25 -070087}
88
NeilBrowna55370a2005-06-23 22:03:52 -070089static void
90md5_to_hex(char *out, char *md5)
91{
92 int i;
93
94 for (i=0; i<16; i++) {
95 unsigned char c = md5[i];
96
97 *out++ = '0' + ((c&0xf0)>>4) + (c>=0xa0)*('a'-'9'-1);
98 *out++ = '0' + (c&0x0f) + ((c&0x0f)>=0x0a)*('a'-'9'-1);
99 }
100 *out = '\0';
101}
102
Jeff Layton2216d442012-11-12 15:00:57 -0500103static int
104nfs4_make_rec_clidname(char *dname, const struct xdr_netobj *clname)
NeilBrowna55370a2005-06-23 22:03:52 -0700105{
106 struct xdr_netobj cksum;
Herbert Xu35058682006-08-24 19:10:20 +1000107 struct hash_desc desc;
Jens Axboe60c74f82007-10-22 19:43:30 +0200108 struct scatterlist sg;
Jeff Layton2216d442012-11-12 15:00:57 -0500109 int status;
NeilBrowna55370a2005-06-23 22:03:52 -0700110
111 dprintk("NFSD: nfs4_make_rec_clidname for %.*s\n",
112 clname->len, clname->data);
Herbert Xu35058682006-08-24 19:10:20 +1000113 desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP;
114 desc.tfm = crypto_alloc_hash("md5", 0, CRYPTO_ALG_ASYNC);
Jeff Layton2216d442012-11-12 15:00:57 -0500115 if (IS_ERR(desc.tfm)) {
116 status = PTR_ERR(desc.tfm);
Herbert Xu35058682006-08-24 19:10:20 +1000117 goto out_no_tfm;
Jeff Layton2216d442012-11-12 15:00:57 -0500118 }
119
Herbert Xu35058682006-08-24 19:10:20 +1000120 cksum.len = crypto_hash_digestsize(desc.tfm);
NeilBrowna55370a2005-06-23 22:03:52 -0700121 cksum.data = kmalloc(cksum.len, GFP_KERNEL);
Jeff Layton2216d442012-11-12 15:00:57 -0500122 if (cksum.data == NULL) {
123 status = -ENOMEM;
NeilBrowna55370a2005-06-23 22:03:52 -0700124 goto out;
Jeff Layton2216d442012-11-12 15:00:57 -0500125 }
NeilBrowna55370a2005-06-23 22:03:52 -0700126
Jens Axboe60c74f82007-10-22 19:43:30 +0200127 sg_init_one(&sg, clname->data, clname->len);
NeilBrowna55370a2005-06-23 22:03:52 -0700128
Jeff Layton2216d442012-11-12 15:00:57 -0500129 status = crypto_hash_digest(&desc, &sg, sg.length, cksum.data);
130 if (status)
Herbert Xu35058682006-08-24 19:10:20 +1000131 goto out;
NeilBrowna55370a2005-06-23 22:03:52 -0700132
133 md5_to_hex(dname, cksum.data);
134
Jeff Layton2216d442012-11-12 15:00:57 -0500135 status = 0;
NeilBrowna55370a2005-06-23 22:03:52 -0700136out:
Krishna Kumar2bd9e7b2008-10-20 11:47:09 +0530137 kfree(cksum.data);
Herbert Xu35058682006-08-24 19:10:20 +1000138 crypto_free_hash(desc.tfm);
139out_no_tfm:
NeilBrowna55370a2005-06-23 22:03:52 -0700140 return status;
141}
NeilBrown190e4fb2005-06-23 22:04:25 -0700142
Jeff Layton2216d442012-11-12 15:00:57 -0500143/*
144 * If we had an error generating the recdir name for the legacy tracker
145 * then warn the admin. If the error doesn't appear to be transient,
146 * then disable recovery tracking.
147 */
148static void
Jeff Layton7255e712013-05-09 08:36:23 -0400149legacy_recdir_name_error(struct nfs4_client *clp, int error)
Jeff Layton2216d442012-11-12 15:00:57 -0500150{
151 printk(KERN_ERR "NFSD: unable to generate recoverydir "
152 "name (%d).\n", error);
153
154 /*
155 * if the algorithm just doesn't exist, then disable the recovery
156 * tracker altogether. The crypto libs will generally return this if
157 * FIPS is enabled as well.
158 */
159 if (error == -ENOENT) {
160 printk(KERN_ERR "NFSD: disabling legacy clientid tracking. "
161 "Reboot recovery will not function correctly!\n");
Jeff Layton7255e712013-05-09 08:36:23 -0400162 nfsd4_client_tracking_exit(clp->net);
Jeff Layton2216d442012-11-12 15:00:57 -0500163 }
164}
165
Jeff Layton2a4317c2012-03-21 16:42:43 -0400166static void
167nfsd4_create_clid_dir(struct nfs4_client *clp)
NeilBrownc7b9a452005-06-23 22:04:30 -0700168{
David Howellsd84f4f92008-11-14 10:39:23 +1100169 const struct cred *original_cred;
Jeff Layton2216d442012-11-12 15:00:57 -0500170 char dname[HEXDIR_LEN];
Christoph Hellwige970a572010-03-22 17:32:14 +0100171 struct dentry *dir, *dentry;
Jeff Layton0ce0c2b2012-11-12 15:00:55 -0500172 struct nfs4_client_reclaim *crp;
NeilBrownc7b9a452005-06-23 22:04:30 -0700173 int status;
Stanislav Kinsbursky52e19c02012-11-14 18:21:16 +0300174 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
NeilBrownc7b9a452005-06-23 22:04:30 -0700175
Jeff Laytona52d7262012-03-21 09:52:02 -0400176 if (test_and_set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
J. Bruce Fields7a6ef8c2012-01-05 15:38:41 -0500177 return;
Stanislav Kinsbursky3a073362012-11-26 16:16:25 +0300178 if (!nn->rec_file)
J. Bruce Fields7a6ef8c2012-01-05 15:38:41 -0500179 return;
Jeff Layton2216d442012-11-12 15:00:57 -0500180
181 status = nfs4_make_rec_clidname(dname, &clp->cl_name);
182 if (status)
Jeff Layton7255e712013-05-09 08:36:23 -0400183 return legacy_recdir_name_error(clp, status);
Jeff Layton2216d442012-11-12 15:00:57 -0500184
David Howellsd84f4f92008-11-14 10:39:23 +1100185 status = nfs4_save_creds(&original_cred);
186 if (status < 0)
J. Bruce Fields7a6ef8c2012-01-05 15:38:41 -0500187 return;
NeilBrownc7b9a452005-06-23 22:04:30 -0700188
Stanislav Kinsbursky3a073362012-11-26 16:16:25 +0300189 status = mnt_want_write_file(nn->rec_file);
Jan Kara4a55c102012-06-12 16:20:33 +0200190 if (status)
191 return;
192
Stanislav Kinsbursky3a073362012-11-26 16:16:25 +0300193 dir = nn->rec_file->f_path.dentry;
NeilBrownc7b9a452005-06-23 22:04:30 -0700194 /* lock the parent */
Christoph Hellwige970a572010-03-22 17:32:14 +0100195 mutex_lock(&dir->d_inode->i_mutex);
NeilBrownc7b9a452005-06-23 22:04:30 -0700196
Christoph Hellwige970a572010-03-22 17:32:14 +0100197 dentry = lookup_one_len(dname, dir, HEXDIR_LEN-1);
NeilBrownc7b9a452005-06-23 22:04:30 -0700198 if (IS_ERR(dentry)) {
199 status = PTR_ERR(dentry);
200 goto out_unlock;
201 }
Boaz Harrosh6577aac2011-08-12 17:30:12 -0700202 if (dentry->d_inode)
J. Bruce Fieldsaec39682012-01-02 17:30:05 -0500203 /*
204 * In the 4.1 case, where we're called from
205 * reclaim_complete(), records from the previous reboot
206 * may still be left, so this is OK.
207 *
208 * In the 4.0 case, we should never get here; but we may
209 * as well be forgiving and just succeed silently.
210 */
NeilBrownc7b9a452005-06-23 22:04:30 -0700211 goto out_put;
Christoph Hellwige970a572010-03-22 17:32:14 +0100212 status = vfs_mkdir(dir->d_inode, dentry, S_IRWXU);
NeilBrownc7b9a452005-06-23 22:04:30 -0700213out_put:
214 dput(dentry);
215out_unlock:
Christoph Hellwige970a572010-03-22 17:32:14 +0100216 mutex_unlock(&dir->d_inode->i_mutex);
Jeff Layton0ce0c2b2012-11-12 15:00:55 -0500217 if (status == 0) {
Stanislav Kinsburskyf141f792012-11-26 16:16:30 +0300218 if (nn->in_grace) {
Stanislav Kinsbursky52e19c02012-11-14 18:21:16 +0300219 crp = nfs4_client_to_reclaim(dname, nn);
Jeff Layton0ce0c2b2012-11-12 15:00:55 -0500220 if (crp)
221 crp->cr_clp = clp;
222 }
Stanislav Kinsbursky3a073362012-11-26 16:16:25 +0300223 vfs_fsync(nn->rec_file, 0);
Jeff Layton0ce0c2b2012-11-12 15:00:55 -0500224 } else {
Boaz Harrosh6577aac2011-08-12 17:30:12 -0700225 printk(KERN_ERR "NFSD: failed to write recovery record"
226 " (err %d); please check that %s exists"
227 " and is writeable", status,
228 user_recovery_dirname);
Jeff Layton0ce0c2b2012-11-12 15:00:55 -0500229 }
Stanislav Kinsbursky3a073362012-11-26 16:16:25 +0300230 mnt_drop_write_file(nn->rec_file);
David Howellsd84f4f92008-11-14 10:39:23 +1100231 nfs4_reset_creds(original_cred);
NeilBrownc7b9a452005-06-23 22:04:30 -0700232}
233
Stanislav Kinsbursky52e19c02012-11-14 18:21:16 +0300234typedef int (recdir_func)(struct dentry *, struct dentry *, struct nfsd_net *);
NeilBrown190e4fb2005-06-23 22:04:25 -0700235
J. Bruce Fields05f4f672009-03-13 16:02:59 -0400236struct name_list {
237 char name[HEXDIR_LEN];
NeilBrown190e4fb2005-06-23 22:04:25 -0700238 struct list_head list;
239};
240
Al Virobb6f6192013-05-15 18:49:12 -0400241struct nfs4_dir_ctx {
242 struct dir_context ctx;
243 struct list_head names;
244};
245
NeilBrown190e4fb2005-06-23 22:04:25 -0700246static int
J. Bruce Fields05f4f672009-03-13 16:02:59 -0400247nfsd4_build_namelist(void *arg, const char *name, int namlen,
David Howellsafefdbb2006-10-03 01:13:46 -0700248 loff_t offset, u64 ino, unsigned int d_type)
NeilBrown190e4fb2005-06-23 22:04:25 -0700249{
Al Virobb6f6192013-05-15 18:49:12 -0400250 struct nfs4_dir_ctx *ctx = arg;
J. Bruce Fields05f4f672009-03-13 16:02:59 -0400251 struct name_list *entry;
NeilBrown190e4fb2005-06-23 22:04:25 -0700252
J. Bruce Fields05f4f672009-03-13 16:02:59 -0400253 if (namlen != HEXDIR_LEN - 1)
Al Virob37ad282006-10-19 23:28:59 -0700254 return 0;
J. Bruce Fields05f4f672009-03-13 16:02:59 -0400255 entry = kmalloc(sizeof(struct name_list), GFP_KERNEL);
256 if (entry == NULL)
NeilBrown190e4fb2005-06-23 22:04:25 -0700257 return -ENOMEM;
J. Bruce Fields05f4f672009-03-13 16:02:59 -0400258 memcpy(entry->name, name, HEXDIR_LEN - 1);
259 entry->name[HEXDIR_LEN - 1] = '\0';
Al Virobb6f6192013-05-15 18:49:12 -0400260 list_add(&entry->list, &ctx->names);
NeilBrown190e4fb2005-06-23 22:04:25 -0700261 return 0;
262}
263
264static int
Stanislav Kinsbursky52e19c02012-11-14 18:21:16 +0300265nfsd4_list_rec_dir(recdir_func *f, struct nfsd_net *nn)
NeilBrown190e4fb2005-06-23 22:04:25 -0700266{
David Howellsd84f4f92008-11-14 10:39:23 +1100267 const struct cred *original_cred;
Stanislav Kinsbursky3a073362012-11-26 16:16:25 +0300268 struct dentry *dir = nn->rec_file->f_path.dentry;
Al Viroac6614b2013-05-22 22:22:04 -0400269 struct nfs4_dir_ctx ctx = {
270 .ctx.actor = nfsd4_build_namelist,
271 .names = LIST_HEAD_INIT(ctx.names)
272 };
NeilBrown190e4fb2005-06-23 22:04:25 -0700273 int status;
274
David Howellsd84f4f92008-11-14 10:39:23 +1100275 status = nfs4_save_creds(&original_cred);
276 if (status < 0)
277 return status;
NeilBrown190e4fb2005-06-23 22:04:25 -0700278
Stanislav Kinsbursky3a073362012-11-26 16:16:25 +0300279 status = vfs_llseek(nn->rec_file, 0, SEEK_SET);
Al Viro5b4b2992011-07-07 18:43:21 -0400280 if (status < 0) {
281 nfs4_reset_creds(original_cred);
282 return status;
283 }
284
Al Viro5c0ba4e2013-05-15 13:52:59 -0400285 status = iterate_dir(nn->rec_file, &ctx.ctx);
J. Bruce Fields8daed1e2009-05-11 16:10:19 -0400286 mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_PARENT);
Al Viro5c0ba4e2013-05-15 13:52:59 -0400287 while (!list_empty(&ctx.names)) {
Al Viro5b4b2992011-07-07 18:43:21 -0400288 struct name_list *entry;
Al Viro5c0ba4e2013-05-15 13:52:59 -0400289 entry = list_entry(ctx.names.next, struct name_list, list);
Al Viro5b4b2992011-07-07 18:43:21 -0400290 if (!status) {
291 struct dentry *dentry;
292 dentry = lookup_one_len(entry->name, dir, HEXDIR_LEN-1);
293 if (IS_ERR(dentry)) {
294 status = PTR_ERR(dentry);
295 break;
296 }
Stanislav Kinsbursky52e19c02012-11-14 18:21:16 +0300297 status = f(dir, dentry, nn);
Al Viro5b4b2992011-07-07 18:43:21 -0400298 dput(dentry);
J. Bruce Fields05f4f672009-03-13 16:02:59 -0400299 }
J. Bruce Fields05f4f672009-03-13 16:02:59 -0400300 list_del(&entry->list);
301 kfree(entry);
NeilBrown190e4fb2005-06-23 22:04:25 -0700302 }
David Woodhouse2f9092e2009-04-20 23:18:37 +0100303 mutex_unlock(&dir->d_inode->i_mutex);
David Howellsd84f4f92008-11-14 10:39:23 +1100304 nfs4_reset_creds(original_cred);
NeilBrown190e4fb2005-06-23 22:04:25 -0700305 return status;
306}
307
308static int
Stanislav Kinsbursky3a073362012-11-26 16:16:25 +0300309nfsd4_unlink_clid_dir(char *name, int namlen, struct nfsd_net *nn)
NeilBrownc7b9a452005-06-23 22:04:30 -0700310{
Christoph Hellwige970a572010-03-22 17:32:14 +0100311 struct dentry *dir, *dentry;
NeilBrownc7b9a452005-06-23 22:04:30 -0700312 int status;
313
314 dprintk("NFSD: nfsd4_unlink_clid_dir. name %.*s\n", namlen, name);
315
Stanislav Kinsbursky3a073362012-11-26 16:16:25 +0300316 dir = nn->rec_file->f_path.dentry;
Christoph Hellwige970a572010-03-22 17:32:14 +0100317 mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_PARENT);
318 dentry = lookup_one_len(name, dir, namlen);
NeilBrownc7b9a452005-06-23 22:04:30 -0700319 if (IS_ERR(dentry)) {
320 status = PTR_ERR(dentry);
David Woodhouse2f9092e2009-04-20 23:18:37 +0100321 goto out_unlock;
NeilBrownc7b9a452005-06-23 22:04:30 -0700322 }
323 status = -ENOENT;
324 if (!dentry->d_inode)
325 goto out;
Christoph Hellwige970a572010-03-22 17:32:14 +0100326 status = vfs_rmdir(dir->d_inode, dentry);
NeilBrownc7b9a452005-06-23 22:04:30 -0700327out:
328 dput(dentry);
David Woodhouse2f9092e2009-04-20 23:18:37 +0100329out_unlock:
Christoph Hellwige970a572010-03-22 17:32:14 +0100330 mutex_unlock(&dir->d_inode->i_mutex);
NeilBrownc7b9a452005-06-23 22:04:30 -0700331 return status;
332}
333
Jeff Layton2a4317c2012-03-21 16:42:43 -0400334static void
NeilBrownc7b9a452005-06-23 22:04:30 -0700335nfsd4_remove_clid_dir(struct nfs4_client *clp)
336{
David Howellsd84f4f92008-11-14 10:39:23 +1100337 const struct cred *original_cred;
Jeff Layton0ce0c2b2012-11-12 15:00:55 -0500338 struct nfs4_client_reclaim *crp;
Jeff Layton2216d442012-11-12 15:00:57 -0500339 char dname[HEXDIR_LEN];
NeilBrownc7b9a452005-06-23 22:04:30 -0700340 int status;
Stanislav Kinsbursky52e19c02012-11-14 18:21:16 +0300341 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
NeilBrownc7b9a452005-06-23 22:04:30 -0700342
Stanislav Kinsbursky3a073362012-11-26 16:16:25 +0300343 if (!nn->rec_file || !test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
NeilBrownc7b9a452005-06-23 22:04:30 -0700344 return;
345
Jeff Layton2216d442012-11-12 15:00:57 -0500346 status = nfs4_make_rec_clidname(dname, &clp->cl_name);
347 if (status)
Jeff Layton7255e712013-05-09 08:36:23 -0400348 return legacy_recdir_name_error(clp, status);
Jeff Layton2216d442012-11-12 15:00:57 -0500349
Stanislav Kinsbursky3a073362012-11-26 16:16:25 +0300350 status = mnt_want_write_file(nn->rec_file);
Dave Hansen06227532008-02-15 14:37:34 -0800351 if (status)
352 goto out;
Jeff Laytona52d7262012-03-21 09:52:02 -0400353 clear_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
David Howellsd84f4f92008-11-14 10:39:23 +1100354
355 status = nfs4_save_creds(&original_cred);
356 if (status < 0)
Jeff Layton698d8d82012-11-09 15:31:53 -0500357 goto out_drop_write;
David Howellsd84f4f92008-11-14 10:39:23 +1100358
Stanislav Kinsbursky3a073362012-11-26 16:16:25 +0300359 status = nfsd4_unlink_clid_dir(dname, HEXDIR_LEN-1, nn);
David Howellsd84f4f92008-11-14 10:39:23 +1100360 nfs4_reset_creds(original_cred);
Jeff Layton0ce0c2b2012-11-12 15:00:55 -0500361 if (status == 0) {
Stanislav Kinsbursky3a073362012-11-26 16:16:25 +0300362 vfs_fsync(nn->rec_file, 0);
Stanislav Kinsburskyf141f792012-11-26 16:16:30 +0300363 if (nn->in_grace) {
Jeff Layton0ce0c2b2012-11-12 15:00:55 -0500364 /* remove reclaim record */
Stanislav Kinsbursky52e19c02012-11-14 18:21:16 +0300365 crp = nfsd4_find_reclaim_client(dname, nn);
Jeff Layton0ce0c2b2012-11-12 15:00:55 -0500366 if (crp)
Stanislav Kinsbursky52e19c02012-11-14 18:21:16 +0300367 nfs4_remove_reclaim_record(crp, nn);
Jeff Layton0ce0c2b2012-11-12 15:00:55 -0500368 }
369 }
Jeff Layton698d8d82012-11-09 15:31:53 -0500370out_drop_write:
Stanislav Kinsbursky3a073362012-11-26 16:16:25 +0300371 mnt_drop_write_file(nn->rec_file);
Dave Hansen06227532008-02-15 14:37:34 -0800372out:
NeilBrownc7b9a452005-06-23 22:04:30 -0700373 if (status)
374 printk("NFSD: Failed to remove expired client state directory"
Jeff Layton2216d442012-11-12 15:00:57 -0500375 " %.*s\n", HEXDIR_LEN, dname);
NeilBrownc7b9a452005-06-23 22:04:30 -0700376}
377
378static int
Stanislav Kinsbursky52e19c02012-11-14 18:21:16 +0300379purge_old(struct dentry *parent, struct dentry *child, struct nfsd_net *nn)
NeilBrownc7b9a452005-06-23 22:04:30 -0700380{
381 int status;
382
Stanislav Kinsbursky52e19c02012-11-14 18:21:16 +0300383 if (nfs4_has_reclaimed_state(child->d_name.name, nn))
Al Virob37ad282006-10-19 23:28:59 -0700384 return 0;
NeilBrownc7b9a452005-06-23 22:04:30 -0700385
David Woodhouse2f9092e2009-04-20 23:18:37 +0100386 status = vfs_rmdir(parent->d_inode, child);
NeilBrownc7b9a452005-06-23 22:04:30 -0700387 if (status)
388 printk("failed to remove client recovery directory %s\n",
389 child->d_name.name);
390 /* Keep trying, success or failure: */
Al Virob37ad282006-10-19 23:28:59 -0700391 return 0;
NeilBrownc7b9a452005-06-23 22:04:30 -0700392}
393
Jeff Layton2a4317c2012-03-21 16:42:43 -0400394static void
Stanislav Kinsbursky12760c62012-11-14 18:22:12 +0300395nfsd4_recdir_purge_old(struct nfsd_net *nn, time_t boot_time)
Jeff Layton2a4317c2012-03-21 16:42:43 -0400396{
NeilBrownc7b9a452005-06-23 22:04:30 -0700397 int status;
398
Stanislav Kinsburskyf141f792012-11-26 16:16:30 +0300399 nn->in_grace = false;
Stanislav Kinsbursky3a073362012-11-26 16:16:25 +0300400 if (!nn->rec_file)
NeilBrownc7b9a452005-06-23 22:04:30 -0700401 return;
Stanislav Kinsbursky3a073362012-11-26 16:16:25 +0300402 status = mnt_want_write_file(nn->rec_file);
Dave Hansen06227532008-02-15 14:37:34 -0800403 if (status)
404 goto out;
Stanislav Kinsbursky52e19c02012-11-14 18:21:16 +0300405 status = nfsd4_list_rec_dir(purge_old, nn);
NeilBrownc7b9a452005-06-23 22:04:30 -0700406 if (status == 0)
Stanislav Kinsbursky3a073362012-11-26 16:16:25 +0300407 vfs_fsync(nn->rec_file, 0);
408 mnt_drop_write_file(nn->rec_file);
Dave Hansen06227532008-02-15 14:37:34 -0800409out:
Stanislav Kinsbursky52e19c02012-11-14 18:21:16 +0300410 nfs4_release_reclaim(nn);
NeilBrownc7b9a452005-06-23 22:04:30 -0700411 if (status)
412 printk("nfsd4: failed to purge old clients from recovery"
Stanislav Kinsbursky3a073362012-11-26 16:16:25 +0300413 " directory %s\n", nn->rec_file->f_path.dentry->d_name.name);
NeilBrownc7b9a452005-06-23 22:04:30 -0700414}
415
416static int
Stanislav Kinsbursky52e19c02012-11-14 18:21:16 +0300417load_recdir(struct dentry *parent, struct dentry *child, struct nfsd_net *nn)
NeilBrown190e4fb2005-06-23 22:04:25 -0700418{
419 if (child->d_name.len != HEXDIR_LEN - 1) {
420 printk("nfsd4: illegal name %s in recovery directory\n",
421 child->d_name.name);
422 /* Keep trying; maybe the others are OK: */
Al Virob37ad282006-10-19 23:28:59 -0700423 return 0;
NeilBrown190e4fb2005-06-23 22:04:25 -0700424 }
Stanislav Kinsbursky52e19c02012-11-14 18:21:16 +0300425 nfs4_client_to_reclaim(child->d_name.name, nn);
Al Virob37ad282006-10-19 23:28:59 -0700426 return 0;
NeilBrown190e4fb2005-06-23 22:04:25 -0700427}
428
Jeff Layton2a4317c2012-03-21 16:42:43 -0400429static int
Stanislav Kinsbursky52e19c02012-11-14 18:21:16 +0300430nfsd4_recdir_load(struct net *net) {
NeilBrown190e4fb2005-06-23 22:04:25 -0700431 int status;
Stanislav Kinsbursky52e19c02012-11-14 18:21:16 +0300432 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
NeilBrown190e4fb2005-06-23 22:04:25 -0700433
Stanislav Kinsbursky3a073362012-11-26 16:16:25 +0300434 if (!nn->rec_file)
Christoph Hellwige970a572010-03-22 17:32:14 +0100435 return 0;
436
Stanislav Kinsbursky52e19c02012-11-14 18:21:16 +0300437 status = nfsd4_list_rec_dir(load_recdir, nn);
NeilBrown190e4fb2005-06-23 22:04:25 -0700438 if (status)
439 printk("nfsd4: failed loading clients from recovery"
Stanislav Kinsbursky3a073362012-11-26 16:16:25 +0300440 " directory %s\n", nn->rec_file->f_path.dentry->d_name.name);
NeilBrown190e4fb2005-06-23 22:04:25 -0700441 return status;
442}
443
444/*
445 * Hold reference to the recovery directory.
446 */
447
Jeff Layton2a4317c2012-03-21 16:42:43 -0400448static int
Stanislav Kinsbursky3a073362012-11-26 16:16:25 +0300449nfsd4_init_recdir(struct net *net)
NeilBrown190e4fb2005-06-23 22:04:25 -0700450{
Stanislav Kinsbursky3a073362012-11-26 16:16:25 +0300451 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
David Howellsd84f4f92008-11-14 10:39:23 +1100452 const struct cred *original_cred;
453 int status;
NeilBrown190e4fb2005-06-23 22:04:25 -0700454
455 printk("NFSD: Using %s as the NFSv4 state recovery directory\n",
J. Bruce Fields48483bf2011-08-26 20:40:28 -0400456 user_recovery_dirname);
NeilBrown190e4fb2005-06-23 22:04:25 -0700457
Stanislav Kinsbursky3a073362012-11-26 16:16:25 +0300458 BUG_ON(nn->rec_file);
NeilBrown190e4fb2005-06-23 22:04:25 -0700459
David Howellsd84f4f92008-11-14 10:39:23 +1100460 status = nfs4_save_creds(&original_cred);
461 if (status < 0) {
462 printk("NFSD: Unable to change credentials to find recovery"
463 " directory: error %d\n",
464 status);
Jeff Layton2a4317c2012-03-21 16:42:43 -0400465 return status;
David Howellsd84f4f92008-11-14 10:39:23 +1100466 }
NeilBrown190e4fb2005-06-23 22:04:25 -0700467
Stanislav Kinsbursky3a073362012-11-26 16:16:25 +0300468 nn->rec_file = filp_open(user_recovery_dirname, O_RDONLY | O_DIRECTORY, 0);
469 if (IS_ERR(nn->rec_file)) {
J. Bruce Fieldsc2642ab2006-01-18 17:43:29 -0800470 printk("NFSD: unable to find recovery directory %s\n",
J. Bruce Fields48483bf2011-08-26 20:40:28 -0400471 user_recovery_dirname);
Stanislav Kinsbursky3a073362012-11-26 16:16:25 +0300472 status = PTR_ERR(nn->rec_file);
473 nn->rec_file = NULL;
Christoph Hellwige970a572010-03-22 17:32:14 +0100474 }
NeilBrown190e4fb2005-06-23 22:04:25 -0700475
David Howellsd84f4f92008-11-14 10:39:23 +1100476 nfs4_reset_creds(original_cred);
Jeff Layton0ce0c2b2012-11-12 15:00:55 -0500477 if (!status)
Stanislav Kinsburskyf141f792012-11-26 16:16:30 +0300478 nn->in_grace = true;
Jeff Layton2a4317c2012-03-21 16:42:43 -0400479 return status;
NeilBrown190e4fb2005-06-23 22:04:25 -0700480}
481
Stanislav Kinsbursky52e19c02012-11-14 18:21:16 +0300482
483static int
484nfs4_legacy_state_init(struct net *net)
485{
486 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
487 int i;
488
489 nn->reclaim_str_hashtbl = kmalloc(sizeof(struct list_head) *
490 CLIENT_HASH_SIZE, GFP_KERNEL);
491 if (!nn->reclaim_str_hashtbl)
492 return -ENOMEM;
493
494 for (i = 0; i < CLIENT_HASH_SIZE; i++)
495 INIT_LIST_HEAD(&nn->reclaim_str_hashtbl[i]);
496 nn->reclaim_str_hashtbl_size = 0;
497
498 return 0;
499}
500
501static void
502nfs4_legacy_state_shutdown(struct net *net)
503{
504 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
505
506 kfree(nn->reclaim_str_hashtbl);
507}
508
Jeff Layton2a4317c2012-03-21 16:42:43 -0400509static int
510nfsd4_load_reboot_recovery_data(struct net *net)
511{
512 int status;
513
Stanislav Kinsbursky3a073362012-11-26 16:16:25 +0300514 status = nfsd4_init_recdir(net);
Stanislav Kinsbursky52e19c02012-11-14 18:21:16 +0300515 if (!status)
516 status = nfsd4_recdir_load(net);
Stanislav Kinsbursky52e19c02012-11-14 18:21:16 +0300517 if (status)
518 printk(KERN_ERR "NFSD: Failure reading reboot recovery data\n");
519 return status;
520}
521
522static int
523nfsd4_legacy_tracking_init(struct net *net)
524{
525 int status;
526
Jeff Laytoncc27e0d2012-03-21 09:52:09 -0400527 /* XXX: The legacy code won't work in a container */
528 if (net != &init_net) {
529 WARN(1, KERN_ERR "NFSD: attempt to initialize legacy client "
530 "tracking in a container!\n");
531 return -EINVAL;
532 }
533
Stanislav Kinsbursky52e19c02012-11-14 18:21:16 +0300534 status = nfs4_legacy_state_init(net);
Jeff Layton2a4317c2012-03-21 16:42:43 -0400535 if (status)
Stanislav Kinsbursky52e19c02012-11-14 18:21:16 +0300536 return status;
537
538 status = nfsd4_load_reboot_recovery_data(net);
539 if (status)
540 goto err;
541 return 0;
542
543err:
544 nfs4_legacy_state_shutdown(net);
Jeff Layton2a4317c2012-03-21 16:42:43 -0400545 return status;
546}
547
548static void
Stanislav Kinsbursky3a073362012-11-26 16:16:25 +0300549nfsd4_shutdown_recdir(struct nfsd_net *nn)
NeilBrown190e4fb2005-06-23 22:04:25 -0700550{
Stanislav Kinsbursky3a073362012-11-26 16:16:25 +0300551 if (!nn->rec_file)
NeilBrown190e4fb2005-06-23 22:04:25 -0700552 return;
Stanislav Kinsbursky3a073362012-11-26 16:16:25 +0300553 fput(nn->rec_file);
554 nn->rec_file = NULL;
NeilBrown190e4fb2005-06-23 22:04:25 -0700555}
J. Bruce Fields48483bf2011-08-26 20:40:28 -0400556
Jeff Layton2a4317c2012-03-21 16:42:43 -0400557static void
558nfsd4_legacy_tracking_exit(struct net *net)
559{
Stanislav Kinsbursky52e19c02012-11-14 18:21:16 +0300560 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
561
562 nfs4_release_reclaim(nn);
Stanislav Kinsbursky3a073362012-11-26 16:16:25 +0300563 nfsd4_shutdown_recdir(nn);
Stanislav Kinsbursky52e19c02012-11-14 18:21:16 +0300564 nfs4_legacy_state_shutdown(net);
Jeff Layton2a4317c2012-03-21 16:42:43 -0400565}
566
J. Bruce Fields48483bf2011-08-26 20:40:28 -0400567/*
568 * Change the NFSv4 recovery directory to recdir.
569 */
570int
571nfs4_reset_recoverydir(char *recdir)
572{
573 int status;
574 struct path path;
575
576 status = kern_path(recdir, LOOKUP_FOLLOW, &path);
577 if (status)
578 return status;
579 status = -ENOTDIR;
580 if (S_ISDIR(path.dentry->d_inode->i_mode)) {
581 strcpy(user_recovery_dirname, recdir);
582 status = 0;
583 }
584 path_put(&path);
585 return status;
586}
587
588char *
589nfs4_recoverydir(void)
590{
591 return user_recovery_dirname;
592}
Jeff Layton2a4317c2012-03-21 16:42:43 -0400593
594static int
595nfsd4_check_legacy_client(struct nfs4_client *clp)
596{
Jeff Layton2216d442012-11-12 15:00:57 -0500597 int status;
598 char dname[HEXDIR_LEN];
Jeff Layton0ce0c2b2012-11-12 15:00:55 -0500599 struct nfs4_client_reclaim *crp;
Stanislav Kinsbursky52e19c02012-11-14 18:21:16 +0300600 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
Jeff Layton0ce0c2b2012-11-12 15:00:55 -0500601
Jeff Layton2a4317c2012-03-21 16:42:43 -0400602 /* did we already find that this client is stable? */
603 if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
604 return 0;
605
Jeff Layton2216d442012-11-12 15:00:57 -0500606 status = nfs4_make_rec_clidname(dname, &clp->cl_name);
607 if (status) {
Jeff Layton7255e712013-05-09 08:36:23 -0400608 legacy_recdir_name_error(clp, status);
Jeff Layton2216d442012-11-12 15:00:57 -0500609 return status;
610 }
611
Jeff Layton2a4317c2012-03-21 16:42:43 -0400612 /* look for it in the reclaim hashtable otherwise */
Stanislav Kinsbursky52e19c02012-11-14 18:21:16 +0300613 crp = nfsd4_find_reclaim_client(dname, nn);
Jeff Layton0ce0c2b2012-11-12 15:00:55 -0500614 if (crp) {
Jeff Layton2a4317c2012-03-21 16:42:43 -0400615 set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
Jeff Layton0ce0c2b2012-11-12 15:00:55 -0500616 crp->cr_clp = clp;
Jeff Layton2a4317c2012-03-21 16:42:43 -0400617 return 0;
618 }
619
620 return -ENOENT;
621}
622
623static struct nfsd4_client_tracking_ops nfsd4_legacy_tracking_ops = {
Stanislav Kinsbursky52e19c02012-11-14 18:21:16 +0300624 .init = nfsd4_legacy_tracking_init,
Jeff Layton2a4317c2012-03-21 16:42:43 -0400625 .exit = nfsd4_legacy_tracking_exit,
626 .create = nfsd4_create_clid_dir,
627 .remove = nfsd4_remove_clid_dir,
628 .check = nfsd4_check_legacy_client,
629 .grace_done = nfsd4_recdir_purge_old,
630};
631
Jeff Laytonf3f80142012-03-21 09:52:07 -0400632/* Globals */
633#define NFSD_PIPE_DIR "nfsd"
634#define NFSD_CLD_PIPE "cld"
635
636/* per-net-ns structure for holding cld upcall info */
637struct cld_net {
638 struct rpc_pipe *cn_pipe;
639 spinlock_t cn_lock;
640 struct list_head cn_list;
641 unsigned int cn_xid;
642};
643
644struct cld_upcall {
645 struct list_head cu_list;
646 struct cld_net *cu_net;
647 struct task_struct *cu_task;
648 struct cld_msg cu_msg;
649};
650
651static int
652__cld_pipe_upcall(struct rpc_pipe *pipe, struct cld_msg *cmsg)
653{
654 int ret;
655 struct rpc_pipe_msg msg;
656
657 memset(&msg, 0, sizeof(msg));
658 msg.data = cmsg;
659 msg.len = sizeof(*cmsg);
660
661 /*
662 * Set task state before we queue the upcall. That prevents
663 * wake_up_process in the downcall from racing with schedule.
664 */
665 set_current_state(TASK_UNINTERRUPTIBLE);
666 ret = rpc_queue_upcall(pipe, &msg);
667 if (ret < 0) {
668 set_current_state(TASK_RUNNING);
669 goto out;
670 }
671
672 schedule();
673 set_current_state(TASK_RUNNING);
674
675 if (msg.errno < 0)
676 ret = msg.errno;
677out:
678 return ret;
679}
680
681static int
682cld_pipe_upcall(struct rpc_pipe *pipe, struct cld_msg *cmsg)
683{
684 int ret;
685
686 /*
687 * -EAGAIN occurs when pipe is closed and reopened while there are
688 * upcalls queued.
689 */
690 do {
691 ret = __cld_pipe_upcall(pipe, cmsg);
692 } while (ret == -EAGAIN);
693
694 return ret;
695}
696
697static ssize_t
698cld_pipe_downcall(struct file *filp, const char __user *src, size_t mlen)
699{
700 struct cld_upcall *tmp, *cup;
J. Bruce Fieldsbc1b5422012-04-25 16:58:05 -0400701 struct cld_msg __user *cmsg = (struct cld_msg __user *)src;
Jeff Laytonf3f80142012-03-21 09:52:07 -0400702 uint32_t xid;
703 struct nfsd_net *nn = net_generic(filp->f_dentry->d_sb->s_fs_info,
704 nfsd_net_id);
705 struct cld_net *cn = nn->cld_net;
706
707 if (mlen != sizeof(*cmsg)) {
Randy Dunlap8a7dc4b2012-04-30 12:25:31 -0700708 dprintk("%s: got %zu bytes, expected %zu\n", __func__, mlen,
Jeff Laytonf3f80142012-03-21 09:52:07 -0400709 sizeof(*cmsg));
710 return -EINVAL;
711 }
712
713 /* copy just the xid so we can try to find that */
714 if (copy_from_user(&xid, &cmsg->cm_xid, sizeof(xid)) != 0) {
715 dprintk("%s: error when copying xid from userspace", __func__);
716 return -EFAULT;
717 }
718
719 /* walk the list and find corresponding xid */
720 cup = NULL;
721 spin_lock(&cn->cn_lock);
722 list_for_each_entry(tmp, &cn->cn_list, cu_list) {
723 if (get_unaligned(&tmp->cu_msg.cm_xid) == xid) {
724 cup = tmp;
725 list_del_init(&cup->cu_list);
726 break;
727 }
728 }
729 spin_unlock(&cn->cn_lock);
730
731 /* couldn't find upcall? */
732 if (!cup) {
Jeff Layton21f72c92012-03-28 07:36:01 -0400733 dprintk("%s: couldn't find upcall -- xid=%u\n", __func__, xid);
Jeff Laytonf3f80142012-03-21 09:52:07 -0400734 return -EINVAL;
735 }
736
737 if (copy_from_user(&cup->cu_msg, src, mlen) != 0)
738 return -EFAULT;
739
740 wake_up_process(cup->cu_task);
741 return mlen;
742}
743
744static void
745cld_pipe_destroy_msg(struct rpc_pipe_msg *msg)
746{
747 struct cld_msg *cmsg = msg->data;
748 struct cld_upcall *cup = container_of(cmsg, struct cld_upcall,
749 cu_msg);
750
751 /* errno >= 0 means we got a downcall */
752 if (msg->errno >= 0)
753 return;
754
755 wake_up_process(cup->cu_task);
756}
757
758static const struct rpc_pipe_ops cld_upcall_ops = {
759 .upcall = rpc_pipe_generic_upcall,
760 .downcall = cld_pipe_downcall,
761 .destroy_msg = cld_pipe_destroy_msg,
762};
763
764static struct dentry *
765nfsd4_cld_register_sb(struct super_block *sb, struct rpc_pipe *pipe)
766{
767 struct dentry *dir, *dentry;
768
769 dir = rpc_d_lookup_sb(sb, NFSD_PIPE_DIR);
770 if (dir == NULL)
771 return ERR_PTR(-ENOENT);
772 dentry = rpc_mkpipe_dentry(dir, NFSD_CLD_PIPE, NULL, pipe);
773 dput(dir);
774 return dentry;
775}
776
777static void
778nfsd4_cld_unregister_sb(struct rpc_pipe *pipe)
779{
780 if (pipe->dentry)
781 rpc_unlink(pipe->dentry);
782}
783
784static struct dentry *
785nfsd4_cld_register_net(struct net *net, struct rpc_pipe *pipe)
786{
787 struct super_block *sb;
788 struct dentry *dentry;
789
790 sb = rpc_get_sb_net(net);
791 if (!sb)
792 return NULL;
793 dentry = nfsd4_cld_register_sb(sb, pipe);
794 rpc_put_sb_net(net);
795 return dentry;
796}
797
798static void
799nfsd4_cld_unregister_net(struct net *net, struct rpc_pipe *pipe)
800{
801 struct super_block *sb;
802
803 sb = rpc_get_sb_net(net);
804 if (sb) {
805 nfsd4_cld_unregister_sb(pipe);
806 rpc_put_sb_net(net);
807 }
808}
809
810/* Initialize rpc_pipefs pipe for communication with client tracking daemon */
811static int
812nfsd4_init_cld_pipe(struct net *net)
813{
814 int ret;
815 struct dentry *dentry;
816 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
817 struct cld_net *cn;
818
819 if (nn->cld_net)
820 return 0;
821
822 cn = kzalloc(sizeof(*cn), GFP_KERNEL);
823 if (!cn) {
824 ret = -ENOMEM;
825 goto err;
826 }
827
828 cn->cn_pipe = rpc_mkpipe_data(&cld_upcall_ops, RPC_PIPE_WAIT_FOR_OPEN);
829 if (IS_ERR(cn->cn_pipe)) {
830 ret = PTR_ERR(cn->cn_pipe);
831 goto err;
832 }
833 spin_lock_init(&cn->cn_lock);
834 INIT_LIST_HEAD(&cn->cn_list);
835
836 dentry = nfsd4_cld_register_net(net, cn->cn_pipe);
837 if (IS_ERR(dentry)) {
838 ret = PTR_ERR(dentry);
839 goto err_destroy_data;
840 }
841
842 cn->cn_pipe->dentry = dentry;
843 nn->cld_net = cn;
844 return 0;
845
846err_destroy_data:
847 rpc_destroy_pipe_data(cn->cn_pipe);
848err:
849 kfree(cn);
850 printk(KERN_ERR "NFSD: unable to create nfsdcld upcall pipe (%d)\n",
851 ret);
852 return ret;
853}
854
855static void
856nfsd4_remove_cld_pipe(struct net *net)
857{
858 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
859 struct cld_net *cn = nn->cld_net;
860
861 nfsd4_cld_unregister_net(net, cn->cn_pipe);
862 rpc_destroy_pipe_data(cn->cn_pipe);
863 kfree(nn->cld_net);
864 nn->cld_net = NULL;
865}
866
867static struct cld_upcall *
868alloc_cld_upcall(struct cld_net *cn)
869{
870 struct cld_upcall *new, *tmp;
871
872 new = kzalloc(sizeof(*new), GFP_KERNEL);
873 if (!new)
874 return new;
875
876 /* FIXME: hard cap on number in flight? */
877restart_search:
878 spin_lock(&cn->cn_lock);
879 list_for_each_entry(tmp, &cn->cn_list, cu_list) {
880 if (tmp->cu_msg.cm_xid == cn->cn_xid) {
881 cn->cn_xid++;
882 spin_unlock(&cn->cn_lock);
883 goto restart_search;
884 }
885 }
886 new->cu_task = current;
887 new->cu_msg.cm_vers = CLD_UPCALL_VERSION;
888 put_unaligned(cn->cn_xid++, &new->cu_msg.cm_xid);
889 new->cu_net = cn;
890 list_add(&new->cu_list, &cn->cn_list);
891 spin_unlock(&cn->cn_lock);
892
893 dprintk("%s: allocated xid %u\n", __func__, new->cu_msg.cm_xid);
894
895 return new;
896}
897
898static void
899free_cld_upcall(struct cld_upcall *victim)
900{
901 struct cld_net *cn = victim->cu_net;
902
903 spin_lock(&cn->cn_lock);
904 list_del(&victim->cu_list);
905 spin_unlock(&cn->cn_lock);
906 kfree(victim);
907}
908
909/* Ask daemon to create a new record */
910static void
911nfsd4_cld_create(struct nfs4_client *clp)
912{
913 int ret;
914 struct cld_upcall *cup;
Stanislav Kinsburskyc212cec2012-11-14 18:21:10 +0300915 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
Jeff Laytonf3f80142012-03-21 09:52:07 -0400916 struct cld_net *cn = nn->cld_net;
917
918 /* Don't upcall if it's already stored */
919 if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
920 return;
921
922 cup = alloc_cld_upcall(cn);
923 if (!cup) {
924 ret = -ENOMEM;
925 goto out_err;
926 }
927
928 cup->cu_msg.cm_cmd = Cld_Create;
929 cup->cu_msg.cm_u.cm_name.cn_len = clp->cl_name.len;
930 memcpy(cup->cu_msg.cm_u.cm_name.cn_id, clp->cl_name.data,
931 clp->cl_name.len);
932
933 ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_msg);
934 if (!ret) {
935 ret = cup->cu_msg.cm_status;
936 set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
937 }
938
939 free_cld_upcall(cup);
940out_err:
941 if (ret)
942 printk(KERN_ERR "NFSD: Unable to create client "
943 "record on stable storage: %d\n", ret);
944}
945
946/* Ask daemon to create a new record */
947static void
948nfsd4_cld_remove(struct nfs4_client *clp)
949{
950 int ret;
951 struct cld_upcall *cup;
Stanislav Kinsburskyc212cec2012-11-14 18:21:10 +0300952 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
Jeff Laytonf3f80142012-03-21 09:52:07 -0400953 struct cld_net *cn = nn->cld_net;
954
955 /* Don't upcall if it's already removed */
956 if (!test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
957 return;
958
959 cup = alloc_cld_upcall(cn);
960 if (!cup) {
961 ret = -ENOMEM;
962 goto out_err;
963 }
964
965 cup->cu_msg.cm_cmd = Cld_Remove;
966 cup->cu_msg.cm_u.cm_name.cn_len = clp->cl_name.len;
967 memcpy(cup->cu_msg.cm_u.cm_name.cn_id, clp->cl_name.data,
968 clp->cl_name.len);
969
970 ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_msg);
971 if (!ret) {
972 ret = cup->cu_msg.cm_status;
973 clear_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
974 }
975
976 free_cld_upcall(cup);
977out_err:
978 if (ret)
979 printk(KERN_ERR "NFSD: Unable to remove client "
980 "record from stable storage: %d\n", ret);
981}
982
983/* Check for presence of a record, and update its timestamp */
984static int
985nfsd4_cld_check(struct nfs4_client *clp)
986{
987 int ret;
988 struct cld_upcall *cup;
Stanislav Kinsburskyc212cec2012-11-14 18:21:10 +0300989 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
Jeff Laytonf3f80142012-03-21 09:52:07 -0400990 struct cld_net *cn = nn->cld_net;
991
992 /* Don't upcall if one was already stored during this grace pd */
993 if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
994 return 0;
995
996 cup = alloc_cld_upcall(cn);
997 if (!cup) {
998 printk(KERN_ERR "NFSD: Unable to check client record on "
999 "stable storage: %d\n", -ENOMEM);
1000 return -ENOMEM;
1001 }
1002
1003 cup->cu_msg.cm_cmd = Cld_Check;
1004 cup->cu_msg.cm_u.cm_name.cn_len = clp->cl_name.len;
1005 memcpy(cup->cu_msg.cm_u.cm_name.cn_id, clp->cl_name.data,
1006 clp->cl_name.len);
1007
1008 ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_msg);
1009 if (!ret) {
1010 ret = cup->cu_msg.cm_status;
1011 set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
1012 }
1013
1014 free_cld_upcall(cup);
1015 return ret;
1016}
1017
1018static void
Stanislav Kinsbursky12760c62012-11-14 18:22:12 +03001019nfsd4_cld_grace_done(struct nfsd_net *nn, time_t boot_time)
Jeff Laytonf3f80142012-03-21 09:52:07 -04001020{
1021 int ret;
1022 struct cld_upcall *cup;
Jeff Laytonf3f80142012-03-21 09:52:07 -04001023 struct cld_net *cn = nn->cld_net;
1024
1025 cup = alloc_cld_upcall(cn);
1026 if (!cup) {
1027 ret = -ENOMEM;
1028 goto out_err;
1029 }
1030
1031 cup->cu_msg.cm_cmd = Cld_GraceDone;
1032 cup->cu_msg.cm_u.cm_gracetime = (int64_t)boot_time;
1033 ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_msg);
1034 if (!ret)
1035 ret = cup->cu_msg.cm_status;
1036
1037 free_cld_upcall(cup);
1038out_err:
1039 if (ret)
1040 printk(KERN_ERR "NFSD: Unable to end grace period: %d\n", ret);
1041}
1042
1043static struct nfsd4_client_tracking_ops nfsd4_cld_tracking_ops = {
1044 .init = nfsd4_init_cld_pipe,
1045 .exit = nfsd4_remove_cld_pipe,
1046 .create = nfsd4_cld_create,
1047 .remove = nfsd4_cld_remove,
1048 .check = nfsd4_cld_check,
1049 .grace_done = nfsd4_cld_grace_done,
1050};
1051
Jeff Layton2873d212012-11-12 15:00:48 -05001052/* upcall via usermodehelper */
1053static char cltrack_prog[PATH_MAX] = "/sbin/nfsdcltrack";
1054module_param_string(cltrack_prog, cltrack_prog, sizeof(cltrack_prog),
1055 S_IRUGO|S_IWUSR);
1056MODULE_PARM_DESC(cltrack_prog, "Path to the nfsdcltrack upcall program");
1057
Jeff Laytonf3aa7e242012-11-12 15:00:50 -05001058static bool cltrack_legacy_disable;
1059module_param(cltrack_legacy_disable, bool, S_IRUGO|S_IWUSR);
1060MODULE_PARM_DESC(cltrack_legacy_disable,
1061 "Disable legacy recoverydir conversion. Default: false");
1062
1063#define LEGACY_TOPDIR_ENV_PREFIX "NFSDCLTRACK_LEGACY_TOPDIR="
1064#define LEGACY_RECDIR_ENV_PREFIX "NFSDCLTRACK_LEGACY_RECDIR="
1065
1066static char *
1067nfsd4_cltrack_legacy_topdir(void)
Jeff Layton2873d212012-11-12 15:00:48 -05001068{
Jeff Laytonf3aa7e242012-11-12 15:00:50 -05001069 int copied;
1070 size_t len;
1071 char *result;
1072
1073 if (cltrack_legacy_disable)
1074 return NULL;
1075
1076 len = strlen(LEGACY_TOPDIR_ENV_PREFIX) +
1077 strlen(nfs4_recoverydir()) + 1;
1078
1079 result = kmalloc(len, GFP_KERNEL);
1080 if (!result)
1081 return result;
1082
1083 copied = snprintf(result, len, LEGACY_TOPDIR_ENV_PREFIX "%s",
1084 nfs4_recoverydir());
1085 if (copied >= len) {
1086 /* just return nothing if output was truncated */
1087 kfree(result);
1088 return NULL;
1089 }
1090
1091 return result;
1092}
1093
1094static char *
Jeff Layton2216d442012-11-12 15:00:57 -05001095nfsd4_cltrack_legacy_recdir(const struct xdr_netobj *name)
Jeff Laytonf3aa7e242012-11-12 15:00:50 -05001096{
1097 int copied;
1098 size_t len;
1099 char *result;
1100
1101 if (cltrack_legacy_disable)
1102 return NULL;
1103
1104 /* +1 is for '/' between "topdir" and "recdir" */
1105 len = strlen(LEGACY_RECDIR_ENV_PREFIX) +
1106 strlen(nfs4_recoverydir()) + 1 + HEXDIR_LEN;
1107
1108 result = kmalloc(len, GFP_KERNEL);
1109 if (!result)
1110 return result;
1111
Jeff Layton2216d442012-11-12 15:00:57 -05001112 copied = snprintf(result, len, LEGACY_RECDIR_ENV_PREFIX "%s/",
1113 nfs4_recoverydir());
1114 if (copied > (len - HEXDIR_LEN)) {
1115 /* just return nothing if output will be truncated */
1116 kfree(result);
1117 return NULL;
1118 }
1119
1120 copied = nfs4_make_rec_clidname(result + copied, name);
1121 if (copied) {
Jeff Laytonf3aa7e242012-11-12 15:00:50 -05001122 kfree(result);
1123 return NULL;
1124 }
1125
1126 return result;
1127}
1128
1129static int
1130nfsd4_umh_cltrack_upcall(char *cmd, char *arg, char *legacy)
1131{
1132 char *envp[2];
Jeff Layton2873d212012-11-12 15:00:48 -05001133 char *argv[4];
1134 int ret;
1135
1136 if (unlikely(!cltrack_prog[0])) {
1137 dprintk("%s: cltrack_prog is disabled\n", __func__);
1138 return -EACCES;
1139 }
1140
1141 dprintk("%s: cmd: %s\n", __func__, cmd);
1142 dprintk("%s: arg: %s\n", __func__, arg ? arg : "(null)");
Jeff Laytonf3aa7e242012-11-12 15:00:50 -05001143 dprintk("%s: legacy: %s\n", __func__, legacy ? legacy : "(null)");
1144
1145 envp[0] = legacy;
1146 envp[1] = NULL;
Jeff Layton2873d212012-11-12 15:00:48 -05001147
1148 argv[0] = (char *)cltrack_prog;
1149 argv[1] = cmd;
1150 argv[2] = arg;
1151 argv[3] = NULL;
1152
1153 ret = call_usermodehelper(argv[0], argv, envp, UMH_WAIT_PROC);
1154 /*
1155 * Disable the upcall mechanism if we're getting an ENOENT or EACCES
1156 * error. The admin can re-enable it on the fly by using sysfs
1157 * once the problem has been fixed.
1158 */
1159 if (ret == -ENOENT || ret == -EACCES) {
1160 dprintk("NFSD: %s was not found or isn't executable (%d). "
1161 "Setting cltrack_prog to blank string!",
1162 cltrack_prog, ret);
1163 cltrack_prog[0] = '\0';
1164 }
1165 dprintk("%s: %s return value: %d\n", __func__, cltrack_prog, ret);
1166
1167 return ret;
1168}
1169
1170static char *
1171bin_to_hex_dup(const unsigned char *src, int srclen)
1172{
1173 int i;
1174 char *buf, *hex;
1175
1176 /* +1 for terminating NULL */
1177 buf = kmalloc((srclen * 2) + 1, GFP_KERNEL);
1178 if (!buf)
1179 return buf;
1180
1181 hex = buf;
1182 for (i = 0; i < srclen; i++) {
1183 sprintf(hex, "%2.2x", *src++);
1184 hex += 2;
1185 }
1186 return buf;
1187}
1188
1189static int
1190nfsd4_umh_cltrack_init(struct net __attribute__((unused)) *net)
1191{
Stanislav Kinsbursky71a50302013-02-01 15:56:22 +03001192 /* XXX: The usermode helper s not working in container yet. */
1193 if (net != &init_net) {
1194 WARN(1, KERN_ERR "NFSD: attempt to initialize umh client "
1195 "tracking in a container!\n");
1196 return -EINVAL;
1197 }
Jeff Laytonf3aa7e242012-11-12 15:00:50 -05001198 return nfsd4_umh_cltrack_upcall("init", NULL, NULL);
Jeff Layton2873d212012-11-12 15:00:48 -05001199}
1200
1201static void
1202nfsd4_umh_cltrack_create(struct nfs4_client *clp)
1203{
1204 char *hexid;
1205
1206 hexid = bin_to_hex_dup(clp->cl_name.data, clp->cl_name.len);
1207 if (!hexid) {
1208 dprintk("%s: can't allocate memory for upcall!\n", __func__);
1209 return;
1210 }
Jeff Laytonf3aa7e242012-11-12 15:00:50 -05001211 nfsd4_umh_cltrack_upcall("create", hexid, NULL);
Jeff Layton2873d212012-11-12 15:00:48 -05001212 kfree(hexid);
1213}
1214
1215static void
1216nfsd4_umh_cltrack_remove(struct nfs4_client *clp)
1217{
1218 char *hexid;
1219
1220 hexid = bin_to_hex_dup(clp->cl_name.data, clp->cl_name.len);
1221 if (!hexid) {
1222 dprintk("%s: can't allocate memory for upcall!\n", __func__);
1223 return;
1224 }
Jeff Laytonf3aa7e242012-11-12 15:00:50 -05001225 nfsd4_umh_cltrack_upcall("remove", hexid, NULL);
Jeff Layton2873d212012-11-12 15:00:48 -05001226 kfree(hexid);
1227}
1228
1229static int
1230nfsd4_umh_cltrack_check(struct nfs4_client *clp)
1231{
1232 int ret;
Jeff Laytonf3aa7e242012-11-12 15:00:50 -05001233 char *hexid, *legacy;
Jeff Layton2873d212012-11-12 15:00:48 -05001234
1235 hexid = bin_to_hex_dup(clp->cl_name.data, clp->cl_name.len);
1236 if (!hexid) {
1237 dprintk("%s: can't allocate memory for upcall!\n", __func__);
1238 return -ENOMEM;
1239 }
Jeff Layton2216d442012-11-12 15:00:57 -05001240 legacy = nfsd4_cltrack_legacy_recdir(&clp->cl_name);
Jeff Laytonf3aa7e242012-11-12 15:00:50 -05001241 ret = nfsd4_umh_cltrack_upcall("check", hexid, legacy);
1242 kfree(legacy);
Jeff Layton2873d212012-11-12 15:00:48 -05001243 kfree(hexid);
1244 return ret;
1245}
1246
1247static void
Stanislav Kinsbursky12760c62012-11-14 18:22:12 +03001248nfsd4_umh_cltrack_grace_done(struct nfsd_net __attribute__((unused)) *nn,
Jeff Layton2873d212012-11-12 15:00:48 -05001249 time_t boot_time)
1250{
Jeff Laytonf3aa7e242012-11-12 15:00:50 -05001251 char *legacy;
Jeff Layton2873d212012-11-12 15:00:48 -05001252 char timestr[22]; /* FIXME: better way to determine max size? */
1253
1254 sprintf(timestr, "%ld", boot_time);
Jeff Laytonf3aa7e242012-11-12 15:00:50 -05001255 legacy = nfsd4_cltrack_legacy_topdir();
1256 nfsd4_umh_cltrack_upcall("gracedone", timestr, legacy);
1257 kfree(legacy);
Jeff Layton2873d212012-11-12 15:00:48 -05001258}
1259
1260static struct nfsd4_client_tracking_ops nfsd4_umh_tracking_ops = {
1261 .init = nfsd4_umh_cltrack_init,
1262 .exit = NULL,
1263 .create = nfsd4_umh_cltrack_create,
1264 .remove = nfsd4_umh_cltrack_remove,
1265 .check = nfsd4_umh_cltrack_check,
1266 .grace_done = nfsd4_umh_cltrack_grace_done,
1267};
1268
Jeff Layton2a4317c2012-03-21 16:42:43 -04001269int
1270nfsd4_client_tracking_init(struct net *net)
1271{
1272 int status;
Jeff Laytonf3f80142012-03-21 09:52:07 -04001273 struct path path;
Stanislav Kinsbursky9a9c6472012-12-04 14:29:27 +03001274 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
Jeff Layton2a4317c2012-03-21 16:42:43 -04001275
Jeff Layton2d77bf02012-11-12 15:00:49 -05001276 /* just run the init if it the method is already decided */
Stanislav Kinsbursky9a9c6472012-12-04 14:29:27 +03001277 if (nn->client_tracking_ops)
Jeff Layton2d77bf02012-11-12 15:00:49 -05001278 goto do_init;
1279
1280 /*
1281 * First, try a UMH upcall. It should succeed or fail quickly, so
1282 * there's little harm in trying that first.
1283 */
Stanislav Kinsbursky9a9c6472012-12-04 14:29:27 +03001284 nn->client_tracking_ops = &nfsd4_umh_tracking_ops;
1285 status = nn->client_tracking_ops->init(net);
Jeff Layton2d77bf02012-11-12 15:00:49 -05001286 if (!status)
1287 return status;
1288
1289 /*
1290 * See if the recoverydir exists and is a directory. If it is,
1291 * then use the legacy ops.
1292 */
Stanislav Kinsbursky9a9c6472012-12-04 14:29:27 +03001293 nn->client_tracking_ops = &nfsd4_legacy_tracking_ops;
Jeff Layton2d77bf02012-11-12 15:00:49 -05001294 status = kern_path(nfs4_recoverydir(), LOOKUP_FOLLOW, &path);
1295 if (!status) {
1296 status = S_ISDIR(path.dentry->d_inode->i_mode);
1297 path_put(&path);
1298 if (status)
1299 goto do_init;
Jeff Laytonf3f80142012-03-21 09:52:07 -04001300 }
Jeff Layton2a4317c2012-03-21 16:42:43 -04001301
Jeff Layton2d77bf02012-11-12 15:00:49 -05001302 /* Finally, try to use nfsdcld */
Stanislav Kinsbursky9a9c6472012-12-04 14:29:27 +03001303 nn->client_tracking_ops = &nfsd4_cld_tracking_ops;
Jeff Layton8b0554e2012-11-12 15:00:51 -05001304 printk(KERN_WARNING "NFSD: the nfsdcld client tracking upcall will be "
1305 "removed in 3.10. Please transition to using "
1306 "nfsdcltrack.\n");
Jeff Layton2d77bf02012-11-12 15:00:49 -05001307do_init:
Stanislav Kinsbursky9a9c6472012-12-04 14:29:27 +03001308 status = nn->client_tracking_ops->init(net);
Jeff Layton2a4317c2012-03-21 16:42:43 -04001309 if (status) {
1310 printk(KERN_WARNING "NFSD: Unable to initialize client "
1311 "recovery tracking! (%d)\n", status);
Stanislav Kinsbursky9a9c6472012-12-04 14:29:27 +03001312 nn->client_tracking_ops = NULL;
Jeff Layton2a4317c2012-03-21 16:42:43 -04001313 }
1314 return status;
1315}
1316
1317void
1318nfsd4_client_tracking_exit(struct net *net)
1319{
Stanislav Kinsbursky9a9c6472012-12-04 14:29:27 +03001320 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1321
1322 if (nn->client_tracking_ops) {
1323 if (nn->client_tracking_ops->exit)
1324 nn->client_tracking_ops->exit(net);
1325 nn->client_tracking_ops = NULL;
Jeff Layton2a4317c2012-03-21 16:42:43 -04001326 }
1327}
1328
1329void
1330nfsd4_client_record_create(struct nfs4_client *clp)
1331{
Stanislav Kinsbursky9a9c6472012-12-04 14:29:27 +03001332 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1333
1334 if (nn->client_tracking_ops)
1335 nn->client_tracking_ops->create(clp);
Jeff Layton2a4317c2012-03-21 16:42:43 -04001336}
1337
1338void
1339nfsd4_client_record_remove(struct nfs4_client *clp)
1340{
Stanislav Kinsbursky9a9c6472012-12-04 14:29:27 +03001341 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1342
1343 if (nn->client_tracking_ops)
1344 nn->client_tracking_ops->remove(clp);
Jeff Layton2a4317c2012-03-21 16:42:43 -04001345}
1346
1347int
1348nfsd4_client_record_check(struct nfs4_client *clp)
1349{
Stanislav Kinsbursky9a9c6472012-12-04 14:29:27 +03001350 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1351
1352 if (nn->client_tracking_ops)
1353 return nn->client_tracking_ops->check(clp);
Jeff Layton2a4317c2012-03-21 16:42:43 -04001354
1355 return -EOPNOTSUPP;
1356}
1357
1358void
Stanislav Kinsbursky12760c62012-11-14 18:22:12 +03001359nfsd4_record_grace_done(struct nfsd_net *nn, time_t boot_time)
Jeff Layton2a4317c2012-03-21 16:42:43 -04001360{
Stanislav Kinsbursky9a9c6472012-12-04 14:29:27 +03001361 if (nn->client_tracking_ops)
1362 nn->client_tracking_ops->grace_done(nn, boot_time);
Jeff Layton2a4317c2012-03-21 16:42:43 -04001363}
Jeff Layton813fd322012-03-21 09:52:08 -04001364
1365static int
1366rpc_pipefs_event(struct notifier_block *nb, unsigned long event, void *ptr)
1367{
1368 struct super_block *sb = ptr;
1369 struct net *net = sb->s_fs_info;
1370 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1371 struct cld_net *cn = nn->cld_net;
1372 struct dentry *dentry;
1373 int ret = 0;
1374
1375 if (!try_module_get(THIS_MODULE))
1376 return 0;
1377
1378 if (!cn) {
1379 module_put(THIS_MODULE);
1380 return 0;
1381 }
1382
1383 switch (event) {
1384 case RPC_PIPEFS_MOUNT:
1385 dentry = nfsd4_cld_register_sb(sb, cn->cn_pipe);
1386 if (IS_ERR(dentry)) {
1387 ret = PTR_ERR(dentry);
1388 break;
1389 }
1390 cn->cn_pipe->dentry = dentry;
1391 break;
1392 case RPC_PIPEFS_UMOUNT:
1393 if (cn->cn_pipe->dentry)
1394 nfsd4_cld_unregister_sb(cn->cn_pipe);
1395 break;
1396 default:
1397 ret = -ENOTSUPP;
1398 break;
1399 }
1400 module_put(THIS_MODULE);
1401 return ret;
1402}
1403
J. Bruce Fields2355c592012-04-25 16:56:22 -04001404static struct notifier_block nfsd4_cld_block = {
Jeff Layton813fd322012-03-21 09:52:08 -04001405 .notifier_call = rpc_pipefs_event,
1406};
Jeff Layton797a9d72012-03-29 07:52:49 -04001407
1408int
1409register_cld_notifier(void)
1410{
1411 return rpc_pipefs_notifier_register(&nfsd4_cld_block);
1412}
1413
1414void
1415unregister_cld_notifier(void)
1416{
1417 rpc_pipefs_notifier_unregister(&nfsd4_cld_block);
1418}