hammer2 - Start adding ioctl infrastructure, start writing hammer2 utility
[dragonfly.git] / sys / vfs / hammer2 / hammer2_ioctl.c
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1/*
2 * Copyright (c) 2011-2012 The DragonFly Project. All rights reserved.
3 *
4 * This code is derived from software contributed to The DragonFly Project
5 * by Matthew Dillon <dillon@dragonflybsd.org>
6 * by Venkatesh Srinivas <vsrinivas@dragonflybsd.org>
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
16 * the documentation and/or other materials provided with the
17 * distribution.
18 * 3. Neither the name of The DragonFly Project nor the names of its
19 * contributors may be used to endorse or promote products derived
20 * from this software without specific, prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
23 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
24 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
25 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
26 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
27 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
28 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
29 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
30 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
31 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
32 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35/*
36 * Ioctl Functions.
37 *
38 * WARNING! The ioctl functions which manipulate the connection state need
39 * to be able to run without deadlock on the volume's chain lock.
40 * Most of these functions use a separate lock.
41 */
42
43#include "hammer2.h"
44
45static int hammer2_ioctl_get_version(hammer2_inode_t *ip, void *data);
46static int hammer2_ioctl_get_remote(hammer2_inode_t *ip, void *data);
47static int hammer2_ioctl_add_remote(hammer2_inode_t *ip, void *data);
48static int hammer2_ioctl_del_remote(hammer2_inode_t *ip, void *data);
49static int hammer2_ioctl_rep_remote(hammer2_inode_t *ip, void *data);
50static int hammer2_ioctl_get_socket(hammer2_inode_t *ip, void *data);
51static int hammer2_ioctl_set_socket(hammer2_inode_t *ip, void *data);
52
53int
54hammer2_ioctl(hammer2_inode_t *ip, u_long com, void *data, int fflag,
55 struct ucred *cred)
56{
57 int error;
58
59 /*
60 * Standard root cred checks, will be selectively ignored below
61 * for ioctls that do not require root creds.
62 */
63 error = priv_check_cred(cred, PRIV_HAMMER_IOCTL, 0);
64
65 switch(com) {
66 case HAMMER2IOC_GET_VERSION:
67 /*
68 * Retrieve version and basic status
69 */
70 error = hammer2_ioctl_get_version(ip, data);
71 break;
72 case HAMMER2IOC_GET_REMOTE:
73 /*
74 * Retrieve information about a remote
75 */
76 if (error == 0)
77 error = hammer2_ioctl_get_remote(ip, data);
78 break;
79 case HAMMER2IOC_ADD_REMOTE:
80 /*
81 * Add new remote entry.
82 */
83 if (error == 0)
84 error = hammer2_ioctl_add_remote(ip, data);
85 break;
86 case HAMMER2IOC_DEL_REMOTE:
87 /*
88 * Delete existing remote entry
89 */
90 if (error == 0)
91 error = hammer2_ioctl_del_remote(ip, data);
92 break;
93 case HAMMER2IOC_REP_REMOTE:
94 /*
95 * Replace existing remote entry
96 */
97 if (error == 0)
98 error = hammer2_ioctl_rep_remote(ip, data);
99 break;
100 case HAMMER2IOC_GET_SOCKET:
101 /*
102 * Retrieve communications socket
103 */
104 if (error == 0)
105 error = hammer2_ioctl_get_socket(ip, data);
106 break;
107 case HAMMER2IOC_SET_SOCKET:
108 /*
109 * Set communications socket for connection
110 */
111 if (error == 0)
112 error = hammer2_ioctl_set_socket(ip, data);
113 break;
114 default:
115 error = EOPNOTSUPP;
116 break;
117 }
118 return (error);
119}
120
121/*
122 * Retrieve version and basic info
123 */
124static int
125hammer2_ioctl_get_version(hammer2_inode_t *ip, void *data)
126{
127 hammer2_mount_t *hmp = ip->hmp;
128 hammer2_ioc_version_t *version = data;
129
130 version->version = hmp->voldata.version;
131 return 0;
132}
133
134/*
135 * Retrieve information about a remote
136 */
137static int
138hammer2_ioctl_get_remote(hammer2_inode_t *ip, void *data)
139{
140 hammer2_mount_t *hmp = ip->hmp;
141 hammer2_ioc_remote_t *remote = data;
142 int copyid = remote->copyid;
143
144 if (copyid < 0 || copyid >= HAMMER2_COPYID_COUNT)
145 return (EINVAL);
146
147 hammer2_voldata_lock(hmp);
148 remote->copy1 = hmp->voldata.copyinfo[copyid];
149 hammer2_voldata_unlock(hmp);
150
151 /*
152 * Adjust nextid (GET only)
153 */
154 while (++copyid < HAMMER2_COPYID_COUNT &&
155 hmp->voldata.copyinfo[copyid].copyid == 0) {
156 ++copyid;
157 }
158 if (copyid == HAMMER2_COPYID_COUNT)
159 remote->nextid = -1;
160 else
161 remote->nextid = copyid;
162
163 return(0);
164}
165
166/*
167 * Add new remote entry
168 */
169static int
170hammer2_ioctl_add_remote(hammer2_inode_t *ip, void *data)
171{
172 hammer2_mount_t *hmp = ip->hmp;
173 hammer2_ioc_remote_t *remote = data;
174 int copyid = remote->copyid;
175 int error = 0;
176
177 if (copyid >= HAMMER2_COPYID_COUNT)
178 return (EINVAL);
179
180 hammer2_voldata_lock(hmp);
181 if (copyid < 0) {
182 for (copyid = 1; copyid < HAMMER2_COPYID_COUNT; ++copyid) {
183 if (hmp->voldata.copyinfo[copyid].copyid == 0)
184 break;
185 }
186 if (copyid == HAMMER2_COPYID_COUNT) {
187 error = ENOSPC;
188 goto failed;
189 }
190 }
191 hammer2_modify_volume(hmp);
192 kprintf("copyid %d\n", copyid);
193 remote->copy1.copyid = copyid;
194 hmp->voldata.copyinfo[copyid] = remote->copy1;
195failed:
196 hammer2_voldata_unlock(hmp);
197 return (error);
198}
199
200/*
201 * Delete existing remote entry
202 */
203static int
204hammer2_ioctl_del_remote(hammer2_inode_t *ip, void *data)
205{
206 hammer2_mount_t *hmp = ip->hmp;
207 hammer2_ioc_remote_t *remote = data;
208 int copyid = remote->copyid;
209 int error = 0;
210
211 if (copyid >= HAMMER2_COPYID_COUNT)
212 return (EINVAL);
213 remote->copy1.path[sizeof(remote->copy1.path) - 1] = 0;
214 hammer2_voldata_lock(hmp);
215 if (copyid < 0) {
216 for (copyid = 1; copyid < HAMMER2_COPYID_COUNT; ++copyid) {
217 if (hmp->voldata.copyinfo[copyid].copyid == 0)
218 continue;
219 if (strcmp(remote->copy1.path,
220 hmp->voldata.copyinfo[copyid].path) == 0) {
221 break;
222 }
223 }
224 if (copyid == HAMMER2_COPYID_COUNT) {
225 error = ENOENT;
226 goto failed;
227 }
228 }
229 hammer2_modify_volume(hmp);
230 hmp->voldata.copyinfo[copyid].copyid = 0;
231failed:
232 hammer2_voldata_unlock(hmp);
233 return (error);
234}
235
236/*
237 * Replace existing remote entry
238 */
239static int
240hammer2_ioctl_rep_remote(hammer2_inode_t *ip, void *data)
241{
242 hammer2_mount_t *hmp = ip->hmp;
243 hammer2_ioc_remote_t *remote = data;
244 int copyid = remote->copyid;
245
246 if (copyid < 0 || copyid >= HAMMER2_COPYID_COUNT)
247 return (EINVAL);
248
249 hammer2_voldata_lock(hmp);
250 hammer2_voldata_unlock(hmp);
251
252 return(0);
253}
254
255/*
256 * Retrieve communications socket
257 */
258static int
259hammer2_ioctl_get_socket(hammer2_inode_t *ip, void *data)
260{
261 return (EOPNOTSUPP);
262}
263
264/*
265 * Set communications socket for connection
266 */
267static int
268hammer2_ioctl_set_socket(hammer2_inode_t *ip, void *data)
269{
270 hammer2_mount_t *hmp = ip->hmp;
271 hammer2_ioc_remote_t *remote = data;
272 int copyid = remote->copyid;
273
274 if (copyid < 0 || copyid >= HAMMER2_COPYID_COUNT)
275 return (EINVAL);
276
277 hammer2_voldata_lock(hmp);
278 hammer2_voldata_unlock(hmp);
279
280 return(0);
281}