blob: d88ea7b9a85cbf4557d7689872150d08d33e4e64 [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 *);
Jeff Layton919b8042014-09-12 16:40:20 -040061 void (*grace_done)(struct nfsd_net *);
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)
Kinglong Meec2236f1412014-09-02 22:11:27 +0800191 goto out_creds;
Jan Kara4a55c102012-06-12 16:20:33 +0200192
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 */
David Howells2b0143b2015-03-17 22:25:59 +0000195 mutex_lock(&d_inode(dir)->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 }
David Howells2b0143b2015-03-17 22:25:59 +0000202 if (d_really_is_positive(dentry))
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;
David Howells2b0143b2015-03-17 22:25:59 +0000212 status = vfs_mkdir(d_inode(dir), dentry, S_IRWXU);
NeilBrownc7b9a452005-06-23 22:04:30 -0700213out_put:
214 dput(dentry);
215out_unlock:
David Howells2b0143b2015-03-17 22:25:59 +0000216 mutex_unlock(&d_inode(dir)->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);
Kinglong Meec2236f1412014-09-02 22:11:27 +0800231out_creds:
David Howellsd84f4f92008-11-14 10:39:23 +1100232 nfs4_reset_creds(original_cred);
NeilBrownc7b9a452005-06-23 22:04:30 -0700233}
234
Stanislav Kinsbursky52e19c02012-11-14 18:21:16 +0300235typedef int (recdir_func)(struct dentry *, struct dentry *, struct nfsd_net *);
NeilBrown190e4fb2005-06-23 22:04:25 -0700236
J. Bruce Fields05f4f672009-03-13 16:02:59 -0400237struct name_list {
238 char name[HEXDIR_LEN];
NeilBrown190e4fb2005-06-23 22:04:25 -0700239 struct list_head list;
240};
241
Al Virobb6f6192013-05-15 18:49:12 -0400242struct nfs4_dir_ctx {
243 struct dir_context ctx;
244 struct list_head names;
245};
246
NeilBrown190e4fb2005-06-23 22:04:25 -0700247static int
Miklos Szerediac7576f2014-10-30 17:37:34 +0100248nfsd4_build_namelist(struct dir_context *__ctx, const char *name, int namlen,
David Howellsafefdbb2006-10-03 01:13:46 -0700249 loff_t offset, u64 ino, unsigned int d_type)
NeilBrown190e4fb2005-06-23 22:04:25 -0700250{
Miklos Szerediac7576f2014-10-30 17:37:34 +0100251 struct nfs4_dir_ctx *ctx =
252 container_of(__ctx, struct nfs4_dir_ctx, ctx);
J. Bruce Fields05f4f672009-03-13 16:02:59 -0400253 struct name_list *entry;
NeilBrown190e4fb2005-06-23 22:04:25 -0700254
J. Bruce Fields05f4f672009-03-13 16:02:59 -0400255 if (namlen != HEXDIR_LEN - 1)
Al Virob37ad282006-10-19 23:28:59 -0700256 return 0;
J. Bruce Fields05f4f672009-03-13 16:02:59 -0400257 entry = kmalloc(sizeof(struct name_list), GFP_KERNEL);
258 if (entry == NULL)
NeilBrown190e4fb2005-06-23 22:04:25 -0700259 return -ENOMEM;
J. Bruce Fields05f4f672009-03-13 16:02:59 -0400260 memcpy(entry->name, name, HEXDIR_LEN - 1);
261 entry->name[HEXDIR_LEN - 1] = '\0';
Al Virobb6f6192013-05-15 18:49:12 -0400262 list_add(&entry->list, &ctx->names);
NeilBrown190e4fb2005-06-23 22:04:25 -0700263 return 0;
264}
265
266static int
Stanislav Kinsbursky52e19c02012-11-14 18:21:16 +0300267nfsd4_list_rec_dir(recdir_func *f, struct nfsd_net *nn)
NeilBrown190e4fb2005-06-23 22:04:25 -0700268{
David Howellsd84f4f92008-11-14 10:39:23 +1100269 const struct cred *original_cred;
Stanislav Kinsbursky3a073362012-11-26 16:16:25 +0300270 struct dentry *dir = nn->rec_file->f_path.dentry;
Al Viroac6614b2013-05-22 22:22:04 -0400271 struct nfs4_dir_ctx ctx = {
272 .ctx.actor = nfsd4_build_namelist,
273 .names = LIST_HEAD_INIT(ctx.names)
274 };
NeilBrown190e4fb2005-06-23 22:04:25 -0700275 int status;
276
David Howellsd84f4f92008-11-14 10:39:23 +1100277 status = nfs4_save_creds(&original_cred);
278 if (status < 0)
279 return status;
NeilBrown190e4fb2005-06-23 22:04:25 -0700280
Stanislav Kinsbursky3a073362012-11-26 16:16:25 +0300281 status = vfs_llseek(nn->rec_file, 0, SEEK_SET);
Al Viro5b4b2992011-07-07 18:43:21 -0400282 if (status < 0) {
283 nfs4_reset_creds(original_cred);
284 return status;
285 }
286
Al Viro5c0ba4e2013-05-15 13:52:59 -0400287 status = iterate_dir(nn->rec_file, &ctx.ctx);
David Howells2b0143b2015-03-17 22:25:59 +0000288 mutex_lock_nested(&d_inode(dir)->i_mutex, I_MUTEX_PARENT);
Al Viro5c0ba4e2013-05-15 13:52:59 -0400289 while (!list_empty(&ctx.names)) {
Al Viro5b4b2992011-07-07 18:43:21 -0400290 struct name_list *entry;
Al Viro5c0ba4e2013-05-15 13:52:59 -0400291 entry = list_entry(ctx.names.next, struct name_list, list);
Al Viro5b4b2992011-07-07 18:43:21 -0400292 if (!status) {
293 struct dentry *dentry;
294 dentry = lookup_one_len(entry->name, dir, HEXDIR_LEN-1);
295 if (IS_ERR(dentry)) {
296 status = PTR_ERR(dentry);
297 break;
298 }
Stanislav Kinsbursky52e19c02012-11-14 18:21:16 +0300299 status = f(dir, dentry, nn);
Al Viro5b4b2992011-07-07 18:43:21 -0400300 dput(dentry);
J. Bruce Fields05f4f672009-03-13 16:02:59 -0400301 }
J. Bruce Fields05f4f672009-03-13 16:02:59 -0400302 list_del(&entry->list);
303 kfree(entry);
NeilBrown190e4fb2005-06-23 22:04:25 -0700304 }
David Howells2b0143b2015-03-17 22:25:59 +0000305 mutex_unlock(&d_inode(dir)->i_mutex);
David Howellsd84f4f92008-11-14 10:39:23 +1100306 nfs4_reset_creds(original_cred);
NeilBrown190e4fb2005-06-23 22:04:25 -0700307 return status;
308}
309
310static int
Stanislav Kinsbursky3a073362012-11-26 16:16:25 +0300311nfsd4_unlink_clid_dir(char *name, int namlen, struct nfsd_net *nn)
NeilBrownc7b9a452005-06-23 22:04:30 -0700312{
Christoph Hellwige970a572010-03-22 17:32:14 +0100313 struct dentry *dir, *dentry;
NeilBrownc7b9a452005-06-23 22:04:30 -0700314 int status;
315
316 dprintk("NFSD: nfsd4_unlink_clid_dir. name %.*s\n", namlen, name);
317
Stanislav Kinsbursky3a073362012-11-26 16:16:25 +0300318 dir = nn->rec_file->f_path.dentry;
David Howells2b0143b2015-03-17 22:25:59 +0000319 mutex_lock_nested(&d_inode(dir)->i_mutex, I_MUTEX_PARENT);
Christoph Hellwige970a572010-03-22 17:32:14 +0100320 dentry = lookup_one_len(name, dir, namlen);
NeilBrownc7b9a452005-06-23 22:04:30 -0700321 if (IS_ERR(dentry)) {
322 status = PTR_ERR(dentry);
David Woodhouse2f9092e2009-04-20 23:18:37 +0100323 goto out_unlock;
NeilBrownc7b9a452005-06-23 22:04:30 -0700324 }
325 status = -ENOENT;
David Howells2b0143b2015-03-17 22:25:59 +0000326 if (d_really_is_negative(dentry))
NeilBrownc7b9a452005-06-23 22:04:30 -0700327 goto out;
David Howells2b0143b2015-03-17 22:25:59 +0000328 status = vfs_rmdir(d_inode(dir), dentry);
NeilBrownc7b9a452005-06-23 22:04:30 -0700329out:
330 dput(dentry);
David Woodhouse2f9092e2009-04-20 23:18:37 +0100331out_unlock:
David Howells2b0143b2015-03-17 22:25:59 +0000332 mutex_unlock(&d_inode(dir)->i_mutex);
NeilBrownc7b9a452005-06-23 22:04:30 -0700333 return status;
334}
335
Jeff Layton2a4317c2012-03-21 16:42:43 -0400336static void
NeilBrownc7b9a452005-06-23 22:04:30 -0700337nfsd4_remove_clid_dir(struct nfs4_client *clp)
338{
David Howellsd84f4f92008-11-14 10:39:23 +1100339 const struct cred *original_cred;
Jeff Layton0ce0c2b2012-11-12 15:00:55 -0500340 struct nfs4_client_reclaim *crp;
Jeff Layton2216d442012-11-12 15:00:57 -0500341 char dname[HEXDIR_LEN];
NeilBrownc7b9a452005-06-23 22:04:30 -0700342 int status;
Stanislav Kinsbursky52e19c02012-11-14 18:21:16 +0300343 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
NeilBrownc7b9a452005-06-23 22:04:30 -0700344
Stanislav Kinsbursky3a073362012-11-26 16:16:25 +0300345 if (!nn->rec_file || !test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
NeilBrownc7b9a452005-06-23 22:04:30 -0700346 return;
347
Jeff Layton2216d442012-11-12 15:00:57 -0500348 status = nfs4_make_rec_clidname(dname, &clp->cl_name);
349 if (status)
Jeff Layton7255e712013-05-09 08:36:23 -0400350 return legacy_recdir_name_error(clp, status);
Jeff Layton2216d442012-11-12 15:00:57 -0500351
Stanislav Kinsbursky3a073362012-11-26 16:16:25 +0300352 status = mnt_want_write_file(nn->rec_file);
Dave Hansen06227532008-02-15 14:37:34 -0800353 if (status)
354 goto out;
Jeff Laytona52d7262012-03-21 09:52:02 -0400355 clear_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
David Howellsd84f4f92008-11-14 10:39:23 +1100356
357 status = nfs4_save_creds(&original_cred);
358 if (status < 0)
Jeff Layton698d8d82012-11-09 15:31:53 -0500359 goto out_drop_write;
David Howellsd84f4f92008-11-14 10:39:23 +1100360
Stanislav Kinsbursky3a073362012-11-26 16:16:25 +0300361 status = nfsd4_unlink_clid_dir(dname, HEXDIR_LEN-1, nn);
David Howellsd84f4f92008-11-14 10:39:23 +1100362 nfs4_reset_creds(original_cred);
Jeff Layton0ce0c2b2012-11-12 15:00:55 -0500363 if (status == 0) {
Stanislav Kinsbursky3a073362012-11-26 16:16:25 +0300364 vfs_fsync(nn->rec_file, 0);
Stanislav Kinsburskyf141f792012-11-26 16:16:30 +0300365 if (nn->in_grace) {
Jeff Layton0ce0c2b2012-11-12 15:00:55 -0500366 /* remove reclaim record */
Stanislav Kinsbursky52e19c02012-11-14 18:21:16 +0300367 crp = nfsd4_find_reclaim_client(dname, nn);
Jeff Layton0ce0c2b2012-11-12 15:00:55 -0500368 if (crp)
Stanislav Kinsbursky52e19c02012-11-14 18:21:16 +0300369 nfs4_remove_reclaim_record(crp, nn);
Jeff Layton0ce0c2b2012-11-12 15:00:55 -0500370 }
371 }
Jeff Layton698d8d82012-11-09 15:31:53 -0500372out_drop_write:
Stanislav Kinsbursky3a073362012-11-26 16:16:25 +0300373 mnt_drop_write_file(nn->rec_file);
Dave Hansen06227532008-02-15 14:37:34 -0800374out:
NeilBrownc7b9a452005-06-23 22:04:30 -0700375 if (status)
376 printk("NFSD: Failed to remove expired client state directory"
Jeff Layton2216d442012-11-12 15:00:57 -0500377 " %.*s\n", HEXDIR_LEN, dname);
NeilBrownc7b9a452005-06-23 22:04:30 -0700378}
379
380static int
Stanislav Kinsbursky52e19c02012-11-14 18:21:16 +0300381purge_old(struct dentry *parent, struct dentry *child, struct nfsd_net *nn)
NeilBrownc7b9a452005-06-23 22:04:30 -0700382{
383 int status;
384
Stanislav Kinsbursky52e19c02012-11-14 18:21:16 +0300385 if (nfs4_has_reclaimed_state(child->d_name.name, nn))
Al Virob37ad282006-10-19 23:28:59 -0700386 return 0;
NeilBrownc7b9a452005-06-23 22:04:30 -0700387
David Howells2b0143b2015-03-17 22:25:59 +0000388 status = vfs_rmdir(d_inode(parent), child);
NeilBrownc7b9a452005-06-23 22:04:30 -0700389 if (status)
Al Viroa6a9f182013-09-16 10:57:01 -0400390 printk("failed to remove client recovery directory %pd\n",
391 child);
NeilBrownc7b9a452005-06-23 22:04:30 -0700392 /* Keep trying, success or failure: */
Al Virob37ad282006-10-19 23:28:59 -0700393 return 0;
NeilBrownc7b9a452005-06-23 22:04:30 -0700394}
395
Jeff Layton2a4317c2012-03-21 16:42:43 -0400396static void
Jeff Layton919b8042014-09-12 16:40:20 -0400397nfsd4_recdir_purge_old(struct nfsd_net *nn)
Jeff Layton2a4317c2012-03-21 16:42:43 -0400398{
NeilBrownc7b9a452005-06-23 22:04:30 -0700399 int status;
400
Stanislav Kinsburskyf141f792012-11-26 16:16:30 +0300401 nn->in_grace = false;
Stanislav Kinsbursky3a073362012-11-26 16:16:25 +0300402 if (!nn->rec_file)
NeilBrownc7b9a452005-06-23 22:04:30 -0700403 return;
Stanislav Kinsbursky3a073362012-11-26 16:16:25 +0300404 status = mnt_want_write_file(nn->rec_file);
Dave Hansen06227532008-02-15 14:37:34 -0800405 if (status)
406 goto out;
Stanislav Kinsbursky52e19c02012-11-14 18:21:16 +0300407 status = nfsd4_list_rec_dir(purge_old, nn);
NeilBrownc7b9a452005-06-23 22:04:30 -0700408 if (status == 0)
Stanislav Kinsbursky3a073362012-11-26 16:16:25 +0300409 vfs_fsync(nn->rec_file, 0);
410 mnt_drop_write_file(nn->rec_file);
Dave Hansen06227532008-02-15 14:37:34 -0800411out:
Stanislav Kinsbursky52e19c02012-11-14 18:21:16 +0300412 nfs4_release_reclaim(nn);
NeilBrownc7b9a452005-06-23 22:04:30 -0700413 if (status)
414 printk("nfsd4: failed to purge old clients from recovery"
Al Viroa6a9f182013-09-16 10:57:01 -0400415 " directory %pD\n", nn->rec_file);
NeilBrownc7b9a452005-06-23 22:04:30 -0700416}
417
418static int
Stanislav Kinsbursky52e19c02012-11-14 18:21:16 +0300419load_recdir(struct dentry *parent, struct dentry *child, struct nfsd_net *nn)
NeilBrown190e4fb2005-06-23 22:04:25 -0700420{
421 if (child->d_name.len != HEXDIR_LEN - 1) {
Al Viroa6a9f182013-09-16 10:57:01 -0400422 printk("nfsd4: illegal name %pd in recovery directory\n",
423 child);
NeilBrown190e4fb2005-06-23 22:04:25 -0700424 /* Keep trying; maybe the others are OK: */
Al Virob37ad282006-10-19 23:28:59 -0700425 return 0;
NeilBrown190e4fb2005-06-23 22:04:25 -0700426 }
Stanislav Kinsbursky52e19c02012-11-14 18:21:16 +0300427 nfs4_client_to_reclaim(child->d_name.name, nn);
Al Virob37ad282006-10-19 23:28:59 -0700428 return 0;
NeilBrown190e4fb2005-06-23 22:04:25 -0700429}
430
Jeff Layton2a4317c2012-03-21 16:42:43 -0400431static int
Stanislav Kinsbursky52e19c02012-11-14 18:21:16 +0300432nfsd4_recdir_load(struct net *net) {
NeilBrown190e4fb2005-06-23 22:04:25 -0700433 int status;
Stanislav Kinsbursky52e19c02012-11-14 18:21:16 +0300434 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
NeilBrown190e4fb2005-06-23 22:04:25 -0700435
Stanislav Kinsbursky3a073362012-11-26 16:16:25 +0300436 if (!nn->rec_file)
Christoph Hellwige970a572010-03-22 17:32:14 +0100437 return 0;
438
Stanislav Kinsbursky52e19c02012-11-14 18:21:16 +0300439 status = nfsd4_list_rec_dir(load_recdir, nn);
NeilBrown190e4fb2005-06-23 22:04:25 -0700440 if (status)
441 printk("nfsd4: failed loading clients from recovery"
Al Viroa6a9f182013-09-16 10:57:01 -0400442 " directory %pD\n", nn->rec_file);
NeilBrown190e4fb2005-06-23 22:04:25 -0700443 return status;
444}
445
446/*
447 * Hold reference to the recovery directory.
448 */
449
Jeff Layton2a4317c2012-03-21 16:42:43 -0400450static int
Stanislav Kinsbursky3a073362012-11-26 16:16:25 +0300451nfsd4_init_recdir(struct net *net)
NeilBrown190e4fb2005-06-23 22:04:25 -0700452{
Stanislav Kinsbursky3a073362012-11-26 16:16:25 +0300453 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
David Howellsd84f4f92008-11-14 10:39:23 +1100454 const struct cred *original_cred;
455 int status;
NeilBrown190e4fb2005-06-23 22:04:25 -0700456
457 printk("NFSD: Using %s as the NFSv4 state recovery directory\n",
J. Bruce Fields48483bf2011-08-26 20:40:28 -0400458 user_recovery_dirname);
NeilBrown190e4fb2005-06-23 22:04:25 -0700459
Stanislav Kinsbursky3a073362012-11-26 16:16:25 +0300460 BUG_ON(nn->rec_file);
NeilBrown190e4fb2005-06-23 22:04:25 -0700461
David Howellsd84f4f92008-11-14 10:39:23 +1100462 status = nfs4_save_creds(&original_cred);
463 if (status < 0) {
464 printk("NFSD: Unable to change credentials to find recovery"
465 " directory: error %d\n",
466 status);
Jeff Layton2a4317c2012-03-21 16:42:43 -0400467 return status;
David Howellsd84f4f92008-11-14 10:39:23 +1100468 }
NeilBrown190e4fb2005-06-23 22:04:25 -0700469
Stanislav Kinsbursky3a073362012-11-26 16:16:25 +0300470 nn->rec_file = filp_open(user_recovery_dirname, O_RDONLY | O_DIRECTORY, 0);
471 if (IS_ERR(nn->rec_file)) {
J. Bruce Fieldsc2642ab2006-01-18 17:43:29 -0800472 printk("NFSD: unable to find recovery directory %s\n",
J. Bruce Fields48483bf2011-08-26 20:40:28 -0400473 user_recovery_dirname);
Stanislav Kinsbursky3a073362012-11-26 16:16:25 +0300474 status = PTR_ERR(nn->rec_file);
475 nn->rec_file = NULL;
Christoph Hellwige970a572010-03-22 17:32:14 +0100476 }
NeilBrown190e4fb2005-06-23 22:04:25 -0700477
David Howellsd84f4f92008-11-14 10:39:23 +1100478 nfs4_reset_creds(original_cred);
Jeff Layton0ce0c2b2012-11-12 15:00:55 -0500479 if (!status)
Stanislav Kinsburskyf141f792012-11-26 16:16:30 +0300480 nn->in_grace = true;
Jeff Layton2a4317c2012-03-21 16:42:43 -0400481 return status;
NeilBrown190e4fb2005-06-23 22:04:25 -0700482}
483
Kinglong Mee15d176c2014-09-02 22:12:17 +0800484static void
485nfsd4_shutdown_recdir(struct net *net)
486{
487 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
488
489 if (!nn->rec_file)
490 return;
491 fput(nn->rec_file);
492 nn->rec_file = NULL;
493}
Stanislav Kinsbursky52e19c02012-11-14 18:21:16 +0300494
495static int
496nfs4_legacy_state_init(struct net *net)
497{
498 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
499 int i;
500
501 nn->reclaim_str_hashtbl = kmalloc(sizeof(struct list_head) *
502 CLIENT_HASH_SIZE, GFP_KERNEL);
503 if (!nn->reclaim_str_hashtbl)
504 return -ENOMEM;
505
506 for (i = 0; i < CLIENT_HASH_SIZE; i++)
507 INIT_LIST_HEAD(&nn->reclaim_str_hashtbl[i]);
508 nn->reclaim_str_hashtbl_size = 0;
509
510 return 0;
511}
512
513static void
514nfs4_legacy_state_shutdown(struct net *net)
515{
516 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
517
518 kfree(nn->reclaim_str_hashtbl);
519}
520
Jeff Layton2a4317c2012-03-21 16:42:43 -0400521static int
522nfsd4_load_reboot_recovery_data(struct net *net)
523{
524 int status;
525
Stanislav Kinsbursky3a073362012-11-26 16:16:25 +0300526 status = nfsd4_init_recdir(net);
Stanislav Kinsbursky52e19c02012-11-14 18:21:16 +0300527 if (status)
Kinglong Mee15d176c2014-09-02 22:12:17 +0800528 return status;
529
530 status = nfsd4_recdir_load(net);
531 if (status)
532 nfsd4_shutdown_recdir(net);
533
Stanislav Kinsbursky52e19c02012-11-14 18:21:16 +0300534 return status;
535}
536
537static int
538nfsd4_legacy_tracking_init(struct net *net)
539{
540 int status;
541
Jeff Laytoncc27e0d2012-03-21 09:52:09 -0400542 /* XXX: The legacy code won't work in a container */
543 if (net != &init_net) {
544 WARN(1, KERN_ERR "NFSD: attempt to initialize legacy client "
545 "tracking in a container!\n");
546 return -EINVAL;
547 }
548
Stanislav Kinsbursky52e19c02012-11-14 18:21:16 +0300549 status = nfs4_legacy_state_init(net);
Jeff Layton2a4317c2012-03-21 16:42:43 -0400550 if (status)
Stanislav Kinsbursky52e19c02012-11-14 18:21:16 +0300551 return status;
552
553 status = nfsd4_load_reboot_recovery_data(net);
554 if (status)
555 goto err;
556 return 0;
557
558err:
559 nfs4_legacy_state_shutdown(net);
Jeff Layton2a4317c2012-03-21 16:42:43 -0400560 return status;
561}
562
563static void
Jeff Layton2a4317c2012-03-21 16:42:43 -0400564nfsd4_legacy_tracking_exit(struct net *net)
565{
Stanislav Kinsbursky52e19c02012-11-14 18:21:16 +0300566 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
567
568 nfs4_release_reclaim(nn);
Kinglong Mee15d176c2014-09-02 22:12:17 +0800569 nfsd4_shutdown_recdir(net);
Stanislav Kinsbursky52e19c02012-11-14 18:21:16 +0300570 nfs4_legacy_state_shutdown(net);
Jeff Layton2a4317c2012-03-21 16:42:43 -0400571}
572
J. Bruce Fields48483bf2011-08-26 20:40:28 -0400573/*
574 * Change the NFSv4 recovery directory to recdir.
575 */
576int
577nfs4_reset_recoverydir(char *recdir)
578{
579 int status;
580 struct path path;
581
582 status = kern_path(recdir, LOOKUP_FOLLOW, &path);
583 if (status)
584 return status;
585 status = -ENOTDIR;
David Howellse36cb0b2015-01-29 12:02:35 +0000586 if (d_is_dir(path.dentry)) {
J. Bruce Fields48483bf2011-08-26 20:40:28 -0400587 strcpy(user_recovery_dirname, recdir);
588 status = 0;
589 }
590 path_put(&path);
591 return status;
592}
593
594char *
595nfs4_recoverydir(void)
596{
597 return user_recovery_dirname;
598}
Jeff Layton2a4317c2012-03-21 16:42:43 -0400599
600static int
601nfsd4_check_legacy_client(struct nfs4_client *clp)
602{
Jeff Layton2216d442012-11-12 15:00:57 -0500603 int status;
604 char dname[HEXDIR_LEN];
Jeff Layton0ce0c2b2012-11-12 15:00:55 -0500605 struct nfs4_client_reclaim *crp;
Stanislav Kinsbursky52e19c02012-11-14 18:21:16 +0300606 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
Jeff Layton0ce0c2b2012-11-12 15:00:55 -0500607
Jeff Layton2a4317c2012-03-21 16:42:43 -0400608 /* did we already find that this client is stable? */
609 if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
610 return 0;
611
Jeff Layton2216d442012-11-12 15:00:57 -0500612 status = nfs4_make_rec_clidname(dname, &clp->cl_name);
613 if (status) {
Jeff Layton7255e712013-05-09 08:36:23 -0400614 legacy_recdir_name_error(clp, status);
Jeff Layton2216d442012-11-12 15:00:57 -0500615 return status;
616 }
617
Jeff Layton2a4317c2012-03-21 16:42:43 -0400618 /* look for it in the reclaim hashtable otherwise */
Stanislav Kinsbursky52e19c02012-11-14 18:21:16 +0300619 crp = nfsd4_find_reclaim_client(dname, nn);
Jeff Layton0ce0c2b2012-11-12 15:00:55 -0500620 if (crp) {
Jeff Layton2a4317c2012-03-21 16:42:43 -0400621 set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
Jeff Layton0ce0c2b2012-11-12 15:00:55 -0500622 crp->cr_clp = clp;
Jeff Layton2a4317c2012-03-21 16:42:43 -0400623 return 0;
624 }
625
626 return -ENOENT;
627}
628
629static struct nfsd4_client_tracking_ops nfsd4_legacy_tracking_ops = {
Stanislav Kinsbursky52e19c02012-11-14 18:21:16 +0300630 .init = nfsd4_legacy_tracking_init,
Jeff Layton2a4317c2012-03-21 16:42:43 -0400631 .exit = nfsd4_legacy_tracking_exit,
632 .create = nfsd4_create_clid_dir,
633 .remove = nfsd4_remove_clid_dir,
634 .check = nfsd4_check_legacy_client,
635 .grace_done = nfsd4_recdir_purge_old,
636};
637
Jeff Laytonf3f80142012-03-21 09:52:07 -0400638/* Globals */
639#define NFSD_PIPE_DIR "nfsd"
640#define NFSD_CLD_PIPE "cld"
641
642/* per-net-ns structure for holding cld upcall info */
643struct cld_net {
644 struct rpc_pipe *cn_pipe;
645 spinlock_t cn_lock;
646 struct list_head cn_list;
647 unsigned int cn_xid;
648};
649
650struct cld_upcall {
651 struct list_head cu_list;
652 struct cld_net *cu_net;
653 struct task_struct *cu_task;
654 struct cld_msg cu_msg;
655};
656
657static int
658__cld_pipe_upcall(struct rpc_pipe *pipe, struct cld_msg *cmsg)
659{
660 int ret;
661 struct rpc_pipe_msg msg;
662
663 memset(&msg, 0, sizeof(msg));
664 msg.data = cmsg;
665 msg.len = sizeof(*cmsg);
666
667 /*
668 * Set task state before we queue the upcall. That prevents
669 * wake_up_process in the downcall from racing with schedule.
670 */
671 set_current_state(TASK_UNINTERRUPTIBLE);
672 ret = rpc_queue_upcall(pipe, &msg);
673 if (ret < 0) {
674 set_current_state(TASK_RUNNING);
675 goto out;
676 }
677
678 schedule();
Jeff Laytonf3f80142012-03-21 09:52:07 -0400679
680 if (msg.errno < 0)
681 ret = msg.errno;
682out:
683 return ret;
684}
685
686static int
687cld_pipe_upcall(struct rpc_pipe *pipe, struct cld_msg *cmsg)
688{
689 int ret;
690
691 /*
692 * -EAGAIN occurs when pipe is closed and reopened while there are
693 * upcalls queued.
694 */
695 do {
696 ret = __cld_pipe_upcall(pipe, cmsg);
697 } while (ret == -EAGAIN);
698
699 return ret;
700}
701
702static ssize_t
703cld_pipe_downcall(struct file *filp, const char __user *src, size_t mlen)
704{
705 struct cld_upcall *tmp, *cup;
J. Bruce Fieldsbc1b5422012-04-25 16:58:05 -0400706 struct cld_msg __user *cmsg = (struct cld_msg __user *)src;
Jeff Laytonf3f80142012-03-21 09:52:07 -0400707 uint32_t xid;
Al Viroef8a1a12014-10-31 00:41:12 -0400708 struct nfsd_net *nn = net_generic(file_inode(filp)->i_sb->s_fs_info,
Jeff Laytonf3f80142012-03-21 09:52:07 -0400709 nfsd_net_id);
710 struct cld_net *cn = nn->cld_net;
711
712 if (mlen != sizeof(*cmsg)) {
Randy Dunlap8a7dc4b2012-04-30 12:25:31 -0700713 dprintk("%s: got %zu bytes, expected %zu\n", __func__, mlen,
Jeff Laytonf3f80142012-03-21 09:52:07 -0400714 sizeof(*cmsg));
715 return -EINVAL;
716 }
717
718 /* copy just the xid so we can try to find that */
719 if (copy_from_user(&xid, &cmsg->cm_xid, sizeof(xid)) != 0) {
720 dprintk("%s: error when copying xid from userspace", __func__);
721 return -EFAULT;
722 }
723
724 /* walk the list and find corresponding xid */
725 cup = NULL;
726 spin_lock(&cn->cn_lock);
727 list_for_each_entry(tmp, &cn->cn_list, cu_list) {
728 if (get_unaligned(&tmp->cu_msg.cm_xid) == xid) {
729 cup = tmp;
730 list_del_init(&cup->cu_list);
731 break;
732 }
733 }
734 spin_unlock(&cn->cn_lock);
735
736 /* couldn't find upcall? */
737 if (!cup) {
Jeff Layton21f72c92012-03-28 07:36:01 -0400738 dprintk("%s: couldn't find upcall -- xid=%u\n", __func__, xid);
Jeff Laytonf3f80142012-03-21 09:52:07 -0400739 return -EINVAL;
740 }
741
742 if (copy_from_user(&cup->cu_msg, src, mlen) != 0)
743 return -EFAULT;
744
745 wake_up_process(cup->cu_task);
746 return mlen;
747}
748
749static void
750cld_pipe_destroy_msg(struct rpc_pipe_msg *msg)
751{
752 struct cld_msg *cmsg = msg->data;
753 struct cld_upcall *cup = container_of(cmsg, struct cld_upcall,
754 cu_msg);
755
756 /* errno >= 0 means we got a downcall */
757 if (msg->errno >= 0)
758 return;
759
760 wake_up_process(cup->cu_task);
761}
762
763static const struct rpc_pipe_ops cld_upcall_ops = {
764 .upcall = rpc_pipe_generic_upcall,
765 .downcall = cld_pipe_downcall,
766 .destroy_msg = cld_pipe_destroy_msg,
767};
768
769static struct dentry *
770nfsd4_cld_register_sb(struct super_block *sb, struct rpc_pipe *pipe)
771{
772 struct dentry *dir, *dentry;
773
774 dir = rpc_d_lookup_sb(sb, NFSD_PIPE_DIR);
775 if (dir == NULL)
776 return ERR_PTR(-ENOENT);
777 dentry = rpc_mkpipe_dentry(dir, NFSD_CLD_PIPE, NULL, pipe);
778 dput(dir);
779 return dentry;
780}
781
782static void
783nfsd4_cld_unregister_sb(struct rpc_pipe *pipe)
784{
785 if (pipe->dentry)
786 rpc_unlink(pipe->dentry);
787}
788
789static struct dentry *
790nfsd4_cld_register_net(struct net *net, struct rpc_pipe *pipe)
791{
792 struct super_block *sb;
793 struct dentry *dentry;
794
795 sb = rpc_get_sb_net(net);
796 if (!sb)
797 return NULL;
798 dentry = nfsd4_cld_register_sb(sb, pipe);
799 rpc_put_sb_net(net);
800 return dentry;
801}
802
803static void
804nfsd4_cld_unregister_net(struct net *net, struct rpc_pipe *pipe)
805{
806 struct super_block *sb;
807
808 sb = rpc_get_sb_net(net);
809 if (sb) {
810 nfsd4_cld_unregister_sb(pipe);
811 rpc_put_sb_net(net);
812 }
813}
814
815/* Initialize rpc_pipefs pipe for communication with client tracking daemon */
816static int
817nfsd4_init_cld_pipe(struct net *net)
818{
819 int ret;
820 struct dentry *dentry;
821 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
822 struct cld_net *cn;
823
824 if (nn->cld_net)
825 return 0;
826
827 cn = kzalloc(sizeof(*cn), GFP_KERNEL);
828 if (!cn) {
829 ret = -ENOMEM;
830 goto err;
831 }
832
833 cn->cn_pipe = rpc_mkpipe_data(&cld_upcall_ops, RPC_PIPE_WAIT_FOR_OPEN);
834 if (IS_ERR(cn->cn_pipe)) {
835 ret = PTR_ERR(cn->cn_pipe);
836 goto err;
837 }
838 spin_lock_init(&cn->cn_lock);
839 INIT_LIST_HEAD(&cn->cn_list);
840
841 dentry = nfsd4_cld_register_net(net, cn->cn_pipe);
842 if (IS_ERR(dentry)) {
843 ret = PTR_ERR(dentry);
844 goto err_destroy_data;
845 }
846
847 cn->cn_pipe->dentry = dentry;
848 nn->cld_net = cn;
849 return 0;
850
851err_destroy_data:
852 rpc_destroy_pipe_data(cn->cn_pipe);
853err:
854 kfree(cn);
855 printk(KERN_ERR "NFSD: unable to create nfsdcld upcall pipe (%d)\n",
856 ret);
857 return ret;
858}
859
860static void
861nfsd4_remove_cld_pipe(struct net *net)
862{
863 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
864 struct cld_net *cn = nn->cld_net;
865
866 nfsd4_cld_unregister_net(net, cn->cn_pipe);
867 rpc_destroy_pipe_data(cn->cn_pipe);
868 kfree(nn->cld_net);
869 nn->cld_net = NULL;
870}
871
872static struct cld_upcall *
873alloc_cld_upcall(struct cld_net *cn)
874{
875 struct cld_upcall *new, *tmp;
876
877 new = kzalloc(sizeof(*new), GFP_KERNEL);
878 if (!new)
879 return new;
880
881 /* FIXME: hard cap on number in flight? */
882restart_search:
883 spin_lock(&cn->cn_lock);
884 list_for_each_entry(tmp, &cn->cn_list, cu_list) {
885 if (tmp->cu_msg.cm_xid == cn->cn_xid) {
886 cn->cn_xid++;
887 spin_unlock(&cn->cn_lock);
888 goto restart_search;
889 }
890 }
891 new->cu_task = current;
892 new->cu_msg.cm_vers = CLD_UPCALL_VERSION;
893 put_unaligned(cn->cn_xid++, &new->cu_msg.cm_xid);
894 new->cu_net = cn;
895 list_add(&new->cu_list, &cn->cn_list);
896 spin_unlock(&cn->cn_lock);
897
898 dprintk("%s: allocated xid %u\n", __func__, new->cu_msg.cm_xid);
899
900 return new;
901}
902
903static void
904free_cld_upcall(struct cld_upcall *victim)
905{
906 struct cld_net *cn = victim->cu_net;
907
908 spin_lock(&cn->cn_lock);
909 list_del(&victim->cu_list);
910 spin_unlock(&cn->cn_lock);
911 kfree(victim);
912}
913
914/* Ask daemon to create a new record */
915static void
916nfsd4_cld_create(struct nfs4_client *clp)
917{
918 int ret;
919 struct cld_upcall *cup;
Stanislav Kinsburskyc212cec2012-11-14 18:21:10 +0300920 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
Jeff Laytonf3f80142012-03-21 09:52:07 -0400921 struct cld_net *cn = nn->cld_net;
922
923 /* Don't upcall if it's already stored */
924 if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
925 return;
926
927 cup = alloc_cld_upcall(cn);
928 if (!cup) {
929 ret = -ENOMEM;
930 goto out_err;
931 }
932
933 cup->cu_msg.cm_cmd = Cld_Create;
934 cup->cu_msg.cm_u.cm_name.cn_len = clp->cl_name.len;
935 memcpy(cup->cu_msg.cm_u.cm_name.cn_id, clp->cl_name.data,
936 clp->cl_name.len);
937
938 ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_msg);
939 if (!ret) {
940 ret = cup->cu_msg.cm_status;
941 set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
942 }
943
944 free_cld_upcall(cup);
945out_err:
946 if (ret)
947 printk(KERN_ERR "NFSD: Unable to create client "
948 "record on stable storage: %d\n", ret);
949}
950
951/* Ask daemon to create a new record */
952static void
953nfsd4_cld_remove(struct nfs4_client *clp)
954{
955 int ret;
956 struct cld_upcall *cup;
Stanislav Kinsburskyc212cec2012-11-14 18:21:10 +0300957 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
Jeff Laytonf3f80142012-03-21 09:52:07 -0400958 struct cld_net *cn = nn->cld_net;
959
960 /* Don't upcall if it's already removed */
961 if (!test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
962 return;
963
964 cup = alloc_cld_upcall(cn);
965 if (!cup) {
966 ret = -ENOMEM;
967 goto out_err;
968 }
969
970 cup->cu_msg.cm_cmd = Cld_Remove;
971 cup->cu_msg.cm_u.cm_name.cn_len = clp->cl_name.len;
972 memcpy(cup->cu_msg.cm_u.cm_name.cn_id, clp->cl_name.data,
973 clp->cl_name.len);
974
975 ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_msg);
976 if (!ret) {
977 ret = cup->cu_msg.cm_status;
978 clear_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
979 }
980
981 free_cld_upcall(cup);
982out_err:
983 if (ret)
984 printk(KERN_ERR "NFSD: Unable to remove client "
985 "record from stable storage: %d\n", ret);
986}
987
988/* Check for presence of a record, and update its timestamp */
989static int
990nfsd4_cld_check(struct nfs4_client *clp)
991{
992 int ret;
993 struct cld_upcall *cup;
Stanislav Kinsburskyc212cec2012-11-14 18:21:10 +0300994 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
Jeff Laytonf3f80142012-03-21 09:52:07 -0400995 struct cld_net *cn = nn->cld_net;
996
997 /* Don't upcall if one was already stored during this grace pd */
998 if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
999 return 0;
1000
1001 cup = alloc_cld_upcall(cn);
1002 if (!cup) {
1003 printk(KERN_ERR "NFSD: Unable to check client record on "
1004 "stable storage: %d\n", -ENOMEM);
1005 return -ENOMEM;
1006 }
1007
1008 cup->cu_msg.cm_cmd = Cld_Check;
1009 cup->cu_msg.cm_u.cm_name.cn_len = clp->cl_name.len;
1010 memcpy(cup->cu_msg.cm_u.cm_name.cn_id, clp->cl_name.data,
1011 clp->cl_name.len);
1012
1013 ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_msg);
1014 if (!ret) {
1015 ret = cup->cu_msg.cm_status;
1016 set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
1017 }
1018
1019 free_cld_upcall(cup);
1020 return ret;
1021}
1022
1023static void
Jeff Layton919b8042014-09-12 16:40:20 -04001024nfsd4_cld_grace_done(struct nfsd_net *nn)
Jeff Laytonf3f80142012-03-21 09:52:07 -04001025{
1026 int ret;
1027 struct cld_upcall *cup;
Jeff Laytonf3f80142012-03-21 09:52:07 -04001028 struct cld_net *cn = nn->cld_net;
1029
1030 cup = alloc_cld_upcall(cn);
1031 if (!cup) {
1032 ret = -ENOMEM;
1033 goto out_err;
1034 }
1035
1036 cup->cu_msg.cm_cmd = Cld_GraceDone;
Jeff Layton919b8042014-09-12 16:40:20 -04001037 cup->cu_msg.cm_u.cm_gracetime = (int64_t)nn->boot_time;
Jeff Laytonf3f80142012-03-21 09:52:07 -04001038 ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_msg);
1039 if (!ret)
1040 ret = cup->cu_msg.cm_status;
1041
1042 free_cld_upcall(cup);
1043out_err:
1044 if (ret)
1045 printk(KERN_ERR "NFSD: Unable to end grace period: %d\n", ret);
1046}
1047
1048static struct nfsd4_client_tracking_ops nfsd4_cld_tracking_ops = {
1049 .init = nfsd4_init_cld_pipe,
1050 .exit = nfsd4_remove_cld_pipe,
1051 .create = nfsd4_cld_create,
1052 .remove = nfsd4_cld_remove,
1053 .check = nfsd4_cld_check,
1054 .grace_done = nfsd4_cld_grace_done,
1055};
1056
Jeff Layton2873d212012-11-12 15:00:48 -05001057/* upcall via usermodehelper */
1058static char cltrack_prog[PATH_MAX] = "/sbin/nfsdcltrack";
1059module_param_string(cltrack_prog, cltrack_prog, sizeof(cltrack_prog),
1060 S_IRUGO|S_IWUSR);
1061MODULE_PARM_DESC(cltrack_prog, "Path to the nfsdcltrack upcall program");
1062
Jeff Laytonf3aa7e242012-11-12 15:00:50 -05001063static bool cltrack_legacy_disable;
1064module_param(cltrack_legacy_disable, bool, S_IRUGO|S_IWUSR);
1065MODULE_PARM_DESC(cltrack_legacy_disable,
1066 "Disable legacy recoverydir conversion. Default: false");
1067
1068#define LEGACY_TOPDIR_ENV_PREFIX "NFSDCLTRACK_LEGACY_TOPDIR="
1069#define LEGACY_RECDIR_ENV_PREFIX "NFSDCLTRACK_LEGACY_RECDIR="
Jeff Laytond4318ac2014-09-12 16:40:21 -04001070#define HAS_SESSION_ENV_PREFIX "NFSDCLTRACK_CLIENT_HAS_SESSION="
1071#define GRACE_START_ENV_PREFIX "NFSDCLTRACK_GRACE_START="
Jeff Laytonf3aa7e242012-11-12 15:00:50 -05001072
1073static char *
1074nfsd4_cltrack_legacy_topdir(void)
Jeff Layton2873d212012-11-12 15:00:48 -05001075{
Jeff Laytonf3aa7e242012-11-12 15:00:50 -05001076 int copied;
1077 size_t len;
1078 char *result;
1079
1080 if (cltrack_legacy_disable)
1081 return NULL;
1082
1083 len = strlen(LEGACY_TOPDIR_ENV_PREFIX) +
1084 strlen(nfs4_recoverydir()) + 1;
1085
1086 result = kmalloc(len, GFP_KERNEL);
1087 if (!result)
1088 return result;
1089
1090 copied = snprintf(result, len, LEGACY_TOPDIR_ENV_PREFIX "%s",
1091 nfs4_recoverydir());
1092 if (copied >= len) {
1093 /* just return nothing if output was truncated */
1094 kfree(result);
1095 return NULL;
1096 }
1097
1098 return result;
1099}
1100
1101static char *
Jeff Layton2216d442012-11-12 15:00:57 -05001102nfsd4_cltrack_legacy_recdir(const struct xdr_netobj *name)
Jeff Laytonf3aa7e242012-11-12 15:00:50 -05001103{
1104 int copied;
1105 size_t len;
1106 char *result;
1107
1108 if (cltrack_legacy_disable)
1109 return NULL;
1110
1111 /* +1 is for '/' between "topdir" and "recdir" */
1112 len = strlen(LEGACY_RECDIR_ENV_PREFIX) +
1113 strlen(nfs4_recoverydir()) + 1 + HEXDIR_LEN;
1114
1115 result = kmalloc(len, GFP_KERNEL);
1116 if (!result)
1117 return result;
1118
Jeff Layton2216d442012-11-12 15:00:57 -05001119 copied = snprintf(result, len, LEGACY_RECDIR_ENV_PREFIX "%s/",
1120 nfs4_recoverydir());
1121 if (copied > (len - HEXDIR_LEN)) {
1122 /* just return nothing if output will be truncated */
1123 kfree(result);
1124 return NULL;
1125 }
1126
1127 copied = nfs4_make_rec_clidname(result + copied, name);
1128 if (copied) {
Jeff Laytonf3aa7e242012-11-12 15:00:50 -05001129 kfree(result);
1130 return NULL;
1131 }
1132
1133 return result;
1134}
1135
Jeff Laytond4318ac2014-09-12 16:40:21 -04001136static char *
1137nfsd4_cltrack_client_has_session(struct nfs4_client *clp)
Jeff Laytonf3aa7e242012-11-12 15:00:50 -05001138{
Jeff Laytond4318ac2014-09-12 16:40:21 -04001139 int copied;
1140 size_t len;
1141 char *result;
1142
1143 /* prefix + Y/N character + terminating NULL */
1144 len = strlen(HAS_SESSION_ENV_PREFIX) + 1 + 1;
1145
1146 result = kmalloc(len, GFP_KERNEL);
1147 if (!result)
1148 return result;
1149
1150 copied = snprintf(result, len, HAS_SESSION_ENV_PREFIX "%c",
1151 clp->cl_minorversion ? 'Y' : 'N');
1152 if (copied >= len) {
1153 /* just return nothing if output was truncated */
1154 kfree(result);
1155 return NULL;
1156 }
1157
1158 return result;
1159}
1160
1161static char *
1162nfsd4_cltrack_grace_start(time_t grace_start)
1163{
1164 int copied;
1165 size_t len;
1166 char *result;
1167
1168 /* prefix + max width of int64_t string + terminating NULL */
1169 len = strlen(GRACE_START_ENV_PREFIX) + 22 + 1;
1170
1171 result = kmalloc(len, GFP_KERNEL);
1172 if (!result)
1173 return result;
1174
1175 copied = snprintf(result, len, GRACE_START_ENV_PREFIX "%ld",
1176 grace_start);
1177 if (copied >= len) {
1178 /* just return nothing if output was truncated */
1179 kfree(result);
1180 return NULL;
1181 }
1182
1183 return result;
1184}
1185
1186static int
1187nfsd4_umh_cltrack_upcall(char *cmd, char *arg, char *env0, char *env1)
1188{
1189 char *envp[3];
Jeff Layton2873d212012-11-12 15:00:48 -05001190 char *argv[4];
1191 int ret;
1192
1193 if (unlikely(!cltrack_prog[0])) {
1194 dprintk("%s: cltrack_prog is disabled\n", __func__);
1195 return -EACCES;
1196 }
1197
1198 dprintk("%s: cmd: %s\n", __func__, cmd);
1199 dprintk("%s: arg: %s\n", __func__, arg ? arg : "(null)");
Jeff Laytond4318ac2014-09-12 16:40:21 -04001200 dprintk("%s: env0: %s\n", __func__, env0 ? env0 : "(null)");
1201 dprintk("%s: env1: %s\n", __func__, env1 ? env1 : "(null)");
Jeff Laytonf3aa7e242012-11-12 15:00:50 -05001202
Jeff Laytond4318ac2014-09-12 16:40:21 -04001203 envp[0] = env0;
1204 envp[1] = env1;
1205 envp[2] = NULL;
Jeff Layton2873d212012-11-12 15:00:48 -05001206
1207 argv[0] = (char *)cltrack_prog;
1208 argv[1] = cmd;
1209 argv[2] = arg;
1210 argv[3] = NULL;
1211
1212 ret = call_usermodehelper(argv[0], argv, envp, UMH_WAIT_PROC);
1213 /*
1214 * Disable the upcall mechanism if we're getting an ENOENT or EACCES
1215 * error. The admin can re-enable it on the fly by using sysfs
1216 * once the problem has been fixed.
1217 */
1218 if (ret == -ENOENT || ret == -EACCES) {
1219 dprintk("NFSD: %s was not found or isn't executable (%d). "
1220 "Setting cltrack_prog to blank string!",
1221 cltrack_prog, ret);
1222 cltrack_prog[0] = '\0';
1223 }
1224 dprintk("%s: %s return value: %d\n", __func__, cltrack_prog, ret);
1225
1226 return ret;
1227}
1228
1229static char *
1230bin_to_hex_dup(const unsigned char *src, int srclen)
1231{
1232 int i;
1233 char *buf, *hex;
1234
1235 /* +1 for terminating NULL */
1236 buf = kmalloc((srclen * 2) + 1, GFP_KERNEL);
1237 if (!buf)
1238 return buf;
1239
1240 hex = buf;
1241 for (i = 0; i < srclen; i++) {
1242 sprintf(hex, "%2.2x", *src++);
1243 hex += 2;
1244 }
1245 return buf;
1246}
1247
1248static int
Jeff Laytond4318ac2014-09-12 16:40:21 -04001249nfsd4_umh_cltrack_init(struct net *net)
Jeff Layton2873d212012-11-12 15:00:48 -05001250{
Jeff Laytond4318ac2014-09-12 16:40:21 -04001251 int ret;
1252 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1253 char *grace_start = nfsd4_cltrack_grace_start(nn->boot_time);
1254
Stanislav Kinsbursky71a50302013-02-01 15:56:22 +03001255 /* XXX: The usermode helper s not working in container yet. */
1256 if (net != &init_net) {
1257 WARN(1, KERN_ERR "NFSD: attempt to initialize umh client "
1258 "tracking in a container!\n");
1259 return -EINVAL;
1260 }
Jeff Laytond4318ac2014-09-12 16:40:21 -04001261
1262 ret = nfsd4_umh_cltrack_upcall("init", NULL, grace_start, NULL);
1263 kfree(grace_start);
1264 return ret;
Jeff Layton2873d212012-11-12 15:00:48 -05001265}
1266
1267static void
Jeff Laytond682e752014-09-12 16:40:21 -04001268nfsd4_cltrack_upcall_lock(struct nfs4_client *clp)
1269{
1270 wait_on_bit_lock(&clp->cl_flags, NFSD4_CLIENT_UPCALL_LOCK,
1271 TASK_UNINTERRUPTIBLE);
1272}
1273
1274static void
1275nfsd4_cltrack_upcall_unlock(struct nfs4_client *clp)
1276{
1277 smp_mb__before_atomic();
1278 clear_bit(NFSD4_CLIENT_UPCALL_LOCK, &clp->cl_flags);
1279 smp_mb__after_atomic();
1280 wake_up_bit(&clp->cl_flags, NFSD4_CLIENT_UPCALL_LOCK);
1281}
1282
1283static void
Jeff Layton2873d212012-11-12 15:00:48 -05001284nfsd4_umh_cltrack_create(struct nfs4_client *clp)
1285{
Jeff Laytond4318ac2014-09-12 16:40:21 -04001286 char *hexid, *has_session, *grace_start;
1287 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
Jeff Layton2873d212012-11-12 15:00:48 -05001288
Jeff Layton65decb62014-09-12 16:40:22 -04001289 /*
1290 * With v4.0 clients, there's little difference in outcome between a
1291 * create and check operation, and we can end up calling into this
1292 * function multiple times per client (once for each openowner). So,
1293 * for v4.0 clients skip upcalling once the client has been recorded
1294 * on stable storage.
1295 *
1296 * For v4.1+ clients, the outcome of the two operations is different,
1297 * so we must ensure that we upcall for the create operation. v4.1+
1298 * clients call this on RECLAIM_COMPLETE though, so we should only end
1299 * up doing a single create upcall per client.
1300 */
1301 if (clp->cl_minorversion == 0 &&
1302 test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
1303 return;
1304
Jeff Layton2873d212012-11-12 15:00:48 -05001305 hexid = bin_to_hex_dup(clp->cl_name.data, clp->cl_name.len);
1306 if (!hexid) {
1307 dprintk("%s: can't allocate memory for upcall!\n", __func__);
1308 return;
1309 }
Jeff Laytond682e752014-09-12 16:40:21 -04001310
Jeff Laytond4318ac2014-09-12 16:40:21 -04001311 has_session = nfsd4_cltrack_client_has_session(clp);
1312 grace_start = nfsd4_cltrack_grace_start(nn->boot_time);
Jeff Laytond682e752014-09-12 16:40:21 -04001313
1314 nfsd4_cltrack_upcall_lock(clp);
Jeff Layton788a7912014-09-12 16:40:21 -04001315 if (!nfsd4_umh_cltrack_upcall("create", hexid, has_session, grace_start))
1316 set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
Jeff Laytond682e752014-09-12 16:40:21 -04001317 nfsd4_cltrack_upcall_unlock(clp);
1318
Jeff Laytond4318ac2014-09-12 16:40:21 -04001319 kfree(has_session);
1320 kfree(grace_start);
Jeff Layton2873d212012-11-12 15:00:48 -05001321 kfree(hexid);
1322}
1323
1324static void
1325nfsd4_umh_cltrack_remove(struct nfs4_client *clp)
1326{
1327 char *hexid;
1328
Jeff Layton788a7912014-09-12 16:40:21 -04001329 if (!test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
1330 return;
1331
Jeff Layton2873d212012-11-12 15:00:48 -05001332 hexid = bin_to_hex_dup(clp->cl_name.data, clp->cl_name.len);
1333 if (!hexid) {
1334 dprintk("%s: can't allocate memory for upcall!\n", __func__);
1335 return;
1336 }
Jeff Laytond682e752014-09-12 16:40:21 -04001337
1338 nfsd4_cltrack_upcall_lock(clp);
Jeff Layton788a7912014-09-12 16:40:21 -04001339 if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags) &&
1340 nfsd4_umh_cltrack_upcall("remove", hexid, NULL, NULL) == 0)
1341 clear_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
Jeff Laytond682e752014-09-12 16:40:21 -04001342 nfsd4_cltrack_upcall_unlock(clp);
1343
Jeff Layton2873d212012-11-12 15:00:48 -05001344 kfree(hexid);
1345}
1346
1347static int
1348nfsd4_umh_cltrack_check(struct nfs4_client *clp)
1349{
1350 int ret;
Jeff Laytond4318ac2014-09-12 16:40:21 -04001351 char *hexid, *has_session, *legacy;
Jeff Layton2873d212012-11-12 15:00:48 -05001352
Jeff Layton788a7912014-09-12 16:40:21 -04001353 if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
1354 return 0;
1355
Jeff Layton2873d212012-11-12 15:00:48 -05001356 hexid = bin_to_hex_dup(clp->cl_name.data, clp->cl_name.len);
1357 if (!hexid) {
1358 dprintk("%s: can't allocate memory for upcall!\n", __func__);
1359 return -ENOMEM;
1360 }
Jeff Laytond4318ac2014-09-12 16:40:21 -04001361
1362 has_session = nfsd4_cltrack_client_has_session(clp);
Jeff Layton2216d442012-11-12 15:00:57 -05001363 legacy = nfsd4_cltrack_legacy_recdir(&clp->cl_name);
Jeff Laytond682e752014-09-12 16:40:21 -04001364
1365 nfsd4_cltrack_upcall_lock(clp);
Jeff Layton788a7912014-09-12 16:40:21 -04001366 if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) {
1367 ret = 0;
1368 } else {
1369 ret = nfsd4_umh_cltrack_upcall("check", hexid, has_session, legacy);
1370 if (ret == 0)
1371 set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
1372 }
Jeff Laytond682e752014-09-12 16:40:21 -04001373 nfsd4_cltrack_upcall_unlock(clp);
Jeff Laytond4318ac2014-09-12 16:40:21 -04001374 kfree(has_session);
Jeff Laytonf3aa7e242012-11-12 15:00:50 -05001375 kfree(legacy);
Jeff Layton2873d212012-11-12 15:00:48 -05001376 kfree(hexid);
Jeff Laytond4318ac2014-09-12 16:40:21 -04001377
Jeff Layton2873d212012-11-12 15:00:48 -05001378 return ret;
1379}
1380
1381static void
Jeff Layton919b8042014-09-12 16:40:20 -04001382nfsd4_umh_cltrack_grace_done(struct nfsd_net *nn)
Jeff Layton2873d212012-11-12 15:00:48 -05001383{
Jeff Laytonf3aa7e242012-11-12 15:00:50 -05001384 char *legacy;
Jeff Layton2873d212012-11-12 15:00:48 -05001385 char timestr[22]; /* FIXME: better way to determine max size? */
1386
Jeff Layton919b8042014-09-12 16:40:20 -04001387 sprintf(timestr, "%ld", nn->boot_time);
Jeff Laytonf3aa7e242012-11-12 15:00:50 -05001388 legacy = nfsd4_cltrack_legacy_topdir();
Jeff Laytond4318ac2014-09-12 16:40:21 -04001389 nfsd4_umh_cltrack_upcall("gracedone", timestr, legacy, NULL);
Jeff Laytonf3aa7e242012-11-12 15:00:50 -05001390 kfree(legacy);
Jeff Layton2873d212012-11-12 15:00:48 -05001391}
1392
1393static struct nfsd4_client_tracking_ops nfsd4_umh_tracking_ops = {
1394 .init = nfsd4_umh_cltrack_init,
1395 .exit = NULL,
1396 .create = nfsd4_umh_cltrack_create,
1397 .remove = nfsd4_umh_cltrack_remove,
1398 .check = nfsd4_umh_cltrack_check,
1399 .grace_done = nfsd4_umh_cltrack_grace_done,
1400};
1401
Jeff Layton2a4317c2012-03-21 16:42:43 -04001402int
1403nfsd4_client_tracking_init(struct net *net)
1404{
1405 int status;
Jeff Laytonf3f80142012-03-21 09:52:07 -04001406 struct path path;
Stanislav Kinsbursky9a9c6472012-12-04 14:29:27 +03001407 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
Jeff Layton2a4317c2012-03-21 16:42:43 -04001408
Jeff Layton2d77bf02012-11-12 15:00:49 -05001409 /* just run the init if it the method is already decided */
Stanislav Kinsbursky9a9c6472012-12-04 14:29:27 +03001410 if (nn->client_tracking_ops)
Jeff Layton2d77bf02012-11-12 15:00:49 -05001411 goto do_init;
1412
1413 /*
1414 * First, try a UMH upcall. It should succeed or fail quickly, so
1415 * there's little harm in trying that first.
1416 */
Stanislav Kinsbursky9a9c6472012-12-04 14:29:27 +03001417 nn->client_tracking_ops = &nfsd4_umh_tracking_ops;
1418 status = nn->client_tracking_ops->init(net);
Jeff Layton2d77bf02012-11-12 15:00:49 -05001419 if (!status)
1420 return status;
1421
1422 /*
1423 * See if the recoverydir exists and is a directory. If it is,
1424 * then use the legacy ops.
1425 */
Stanislav Kinsbursky9a9c6472012-12-04 14:29:27 +03001426 nn->client_tracking_ops = &nfsd4_legacy_tracking_ops;
Jeff Layton2d77bf02012-11-12 15:00:49 -05001427 status = kern_path(nfs4_recoverydir(), LOOKUP_FOLLOW, &path);
1428 if (!status) {
David Howellse36cb0b2015-01-29 12:02:35 +00001429 status = d_is_dir(path.dentry);
Jeff Layton2d77bf02012-11-12 15:00:49 -05001430 path_put(&path);
1431 if (status)
1432 goto do_init;
Jeff Laytonf3f80142012-03-21 09:52:07 -04001433 }
Jeff Layton2a4317c2012-03-21 16:42:43 -04001434
Jeff Layton2d77bf02012-11-12 15:00:49 -05001435 /* Finally, try to use nfsdcld */
Stanislav Kinsbursky9a9c6472012-12-04 14:29:27 +03001436 nn->client_tracking_ops = &nfsd4_cld_tracking_ops;
Jeff Layton8b0554e2012-11-12 15:00:51 -05001437 printk(KERN_WARNING "NFSD: the nfsdcld client tracking upcall will be "
1438 "removed in 3.10. Please transition to using "
1439 "nfsdcltrack.\n");
Jeff Layton2d77bf02012-11-12 15:00:49 -05001440do_init:
Stanislav Kinsbursky9a9c6472012-12-04 14:29:27 +03001441 status = nn->client_tracking_ops->init(net);
Jeff Layton2a4317c2012-03-21 16:42:43 -04001442 if (status) {
1443 printk(KERN_WARNING "NFSD: Unable to initialize client "
1444 "recovery tracking! (%d)\n", status);
Stanislav Kinsbursky9a9c6472012-12-04 14:29:27 +03001445 nn->client_tracking_ops = NULL;
Jeff Layton2a4317c2012-03-21 16:42:43 -04001446 }
1447 return status;
1448}
1449
1450void
1451nfsd4_client_tracking_exit(struct net *net)
1452{
Stanislav Kinsbursky9a9c6472012-12-04 14:29:27 +03001453 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1454
1455 if (nn->client_tracking_ops) {
1456 if (nn->client_tracking_ops->exit)
1457 nn->client_tracking_ops->exit(net);
1458 nn->client_tracking_ops = NULL;
Jeff Layton2a4317c2012-03-21 16:42:43 -04001459 }
1460}
1461
1462void
1463nfsd4_client_record_create(struct nfs4_client *clp)
1464{
Stanislav Kinsbursky9a9c6472012-12-04 14:29:27 +03001465 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1466
1467 if (nn->client_tracking_ops)
1468 nn->client_tracking_ops->create(clp);
Jeff Layton2a4317c2012-03-21 16:42:43 -04001469}
1470
1471void
1472nfsd4_client_record_remove(struct nfs4_client *clp)
1473{
Stanislav Kinsbursky9a9c6472012-12-04 14:29:27 +03001474 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1475
1476 if (nn->client_tracking_ops)
1477 nn->client_tracking_ops->remove(clp);
Jeff Layton2a4317c2012-03-21 16:42:43 -04001478}
1479
1480int
1481nfsd4_client_record_check(struct nfs4_client *clp)
1482{
Stanislav Kinsbursky9a9c6472012-12-04 14:29:27 +03001483 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1484
1485 if (nn->client_tracking_ops)
1486 return nn->client_tracking_ops->check(clp);
Jeff Layton2a4317c2012-03-21 16:42:43 -04001487
1488 return -EOPNOTSUPP;
1489}
1490
1491void
Jeff Layton919b8042014-09-12 16:40:20 -04001492nfsd4_record_grace_done(struct nfsd_net *nn)
Jeff Layton2a4317c2012-03-21 16:42:43 -04001493{
Stanislav Kinsbursky9a9c6472012-12-04 14:29:27 +03001494 if (nn->client_tracking_ops)
Jeff Layton919b8042014-09-12 16:40:20 -04001495 nn->client_tracking_ops->grace_done(nn);
Jeff Layton2a4317c2012-03-21 16:42:43 -04001496}
Jeff Layton813fd322012-03-21 09:52:08 -04001497
1498static int
1499rpc_pipefs_event(struct notifier_block *nb, unsigned long event, void *ptr)
1500{
1501 struct super_block *sb = ptr;
1502 struct net *net = sb->s_fs_info;
1503 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1504 struct cld_net *cn = nn->cld_net;
1505 struct dentry *dentry;
1506 int ret = 0;
1507
1508 if (!try_module_get(THIS_MODULE))
1509 return 0;
1510
1511 if (!cn) {
1512 module_put(THIS_MODULE);
1513 return 0;
1514 }
1515
1516 switch (event) {
1517 case RPC_PIPEFS_MOUNT:
1518 dentry = nfsd4_cld_register_sb(sb, cn->cn_pipe);
1519 if (IS_ERR(dentry)) {
1520 ret = PTR_ERR(dentry);
1521 break;
1522 }
1523 cn->cn_pipe->dentry = dentry;
1524 break;
1525 case RPC_PIPEFS_UMOUNT:
1526 if (cn->cn_pipe->dentry)
1527 nfsd4_cld_unregister_sb(cn->cn_pipe);
1528 break;
1529 default:
1530 ret = -ENOTSUPP;
1531 break;
1532 }
1533 module_put(THIS_MODULE);
1534 return ret;
1535}
1536
J. Bruce Fields2355c592012-04-25 16:56:22 -04001537static struct notifier_block nfsd4_cld_block = {
Jeff Layton813fd322012-03-21 09:52:08 -04001538 .notifier_call = rpc_pipefs_event,
1539};
Jeff Layton797a9d72012-03-29 07:52:49 -04001540
1541int
1542register_cld_notifier(void)
1543{
1544 return rpc_pipefs_notifier_register(&nfsd4_cld_block);
1545}
1546
1547void
1548unregister_cld_notifier(void)
1549{
1550 rpc_pipefs_notifier_unregister(&nfsd4_cld_block);
1551}