dm - undo my pointless moving of dm.h
[dragonfly.git] / sys / dev / disk / dm / targets / linear / dm_target_linear.c
CommitLineData
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1/* $NetBSD: dm_target_linear.c,v 1.9 2010/01/04 00:14:41 haad Exp $ */
2
3/*
4 * Copyright (c) 2008 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Adam Hamsik.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32
33/*
34 * This file implements initial version of device-mapper dklinear target.
35 */
36
37#include <sys/types.h>
38#include <sys/param.h>
5b279a20 39#include <sys/ctype.h>
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40
41#include <sys/buf.h>
5b279a20 42#include <sys/malloc.h>
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43#include <sys/vnode.h>
44
a84e173e 45#include <dev/disk/dm/dm.h>
5b279a20 46MALLOC_DEFINE(M_DMLINEAR, "dm_linear", "Device Mapper Target Linear");
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47
48/*
49 * Allocate target specific config data, and link them to table.
50 * This function is called only when, flags is not READONLY and
51 * therefore we can add things to pdev list. This should not a
52 * problem because this routine is called only from dm_table_load_ioctl.
53 * @argv[0] is name,
54 * @argv[1] is physical data offset.
55 */
5c411e8e 56static int
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57dm_target_linear_init(dm_dev_t * dmv, void **target_config, char *params)
58{
59 dm_target_linear_config_t *tlc;
60 dm_pdev_t *dmp;
61
62 char **ap, *argv[3];
63
64 if (params == NULL)
65 return EINVAL;
66
67 /*
68 * Parse a string, containing tokens delimited by white space,
69 * into an argument vector
70 */
71 for (ap = argv; ap < &argv[2] &&
72 (*ap = strsep(&params, " \t")) != NULL;) {
73 if (**ap != '\0')
74 ap++;
75 }
76
77 aprint_debug("Linear target init function called %s--%s!!\n",
78 argv[0], argv[1]);
79
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80 /* XXX: temp hack */
81 if (argv[0] == NULL)
82 return EINVAL;
83
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84 /* Insert dmp to global pdev list */
85 if ((dmp = dm_pdev_insert(argv[0])) == NULL)
86 return ENOENT;
87
5b279a20 88 if ((tlc = kmalloc(sizeof(dm_target_linear_config_t), M_DMLINEAR, M_WAITOK))
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89 == NULL)
90 return ENOMEM;
91
92 tlc->pdev = dmp;
93 tlc->offset = 0; /* default settings */
94
95 /* Check user input if it is not leave offset as 0. */
1446934e 96 tlc->offset = atoi64(argv[1]);
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97
98 *target_config = tlc;
99
100 dmv->dev_type = DM_LINEAR_DEV;
101
102 return 0;
103}
104/*
105 * Status routine is called to get params string, which is target
106 * specific. When dm_table_status_ioctl is called with flag
107 * DM_STATUS_TABLE_FLAG I have to sent params string back.
108 */
5c411e8e 109static char *
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110dm_target_linear_status(void *target_config)
111{
112 dm_target_linear_config_t *tlc;
113 char *params;
114 tlc = target_config;
115
116 aprint_debug("Linear target status function called\n");
117
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118 /* target expects use of M_DM */
119 params = kmalloc(DM_MAX_PARAMS_SIZE, M_DM, M_WAITOK);
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120
121 aprint_normal("%s %" PRIu64, tlc->pdev->name, tlc->offset);
5b279a20 122 ksnprintf(params, DM_MAX_PARAMS_SIZE, "%s %" PRIu64,
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123 tlc->pdev->name, tlc->offset);
124
125 return params;
126}
127/*
128 * Do IO operation, called from dmstrategy routine.
129 */
5c411e8e 130static int
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131dm_target_linear_strategy(dm_table_entry_t * table_en, struct buf * bp)
132{
133 dm_target_linear_config_t *tlc;
134
135 tlc = table_en->target_config;
136
137/* printf("Linear target read function called %" PRIu64 "!!\n",
138 tlc->offset);*/
139
5b279a20 140#if 0
ff56536e 141 bp->b_blkno += tlc->offset;
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142#endif
143 bp->b_bio1.bio_offset += tlc->offset * DEV_BSIZE;
ff56536e 144
5b279a20 145 vn_strategy(tlc->pdev->pdev_vnode, &bp->b_bio1);
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146
147 return 0;
148
149}
79b7159f 150
5c411e8e 151static int
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152dm_target_linear_dump(dm_table_entry_t *table_en, void *data, size_t length, off_t offset)
153{
154 dm_target_linear_config_t *tlc;
155
156 tlc = table_en->target_config;
157
158 offset += tlc->offset * DEV_BSIZE;
159 offset = dm_pdev_correct_dump_offset(tlc->pdev, offset);
160
161 if (tlc->pdev->pdev_vnode->v_rdev == NULL)
162 return ENXIO;
163
164 return dev_ddump(tlc->pdev->pdev_vnode->v_rdev, data, 0, offset, length);
165}
166
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167/*
168 * Destroy target specific data. Decrement table pdevs.
169 */
5c411e8e 170static int
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171dm_target_linear_destroy(dm_table_entry_t * table_en)
172{
173 dm_target_linear_config_t *tlc;
174
175 /*
176 * Destroy function is called for every target even if it
177 * doesn't have target_config.
178 */
179
180 if (table_en->target_config == NULL)
181 return 0;
182
183 tlc = table_en->target_config;
184
185 /* Decrement pdev ref counter if 0 remove it */
186 dm_pdev_decr(tlc->pdev);
187
188 /* Unbusy target so we can unload it */
189 dm_target_unbusy(table_en->target);
190
5b279a20 191 kfree(table_en->target_config, M_DMLINEAR);
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192
193 table_en->target_config = NULL;
194
195 return 0;
196}
197/* Add this target pdev dependiences to prop_array_t */
5c411e8e 198static int
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199dm_target_linear_deps(dm_table_entry_t * table_en, prop_array_t prop_array)
200{
201 dm_target_linear_config_t *tlc;
202 struct vattr va;
203
204 int error;
205
206 if (table_en->target_config == NULL)
207 return ENOENT;
208
209 tlc = table_en->target_config;
210
5b279a20 211 if ((error = VOP_GETATTR(tlc->pdev->pdev_vnode, &va)) != 0)
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212 return error;
213
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214 prop_array_add_uint64(prop_array,
215 (uint64_t) makeudev(va.va_rmajor, va.va_rminor));
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216
217 return 0;
218}
219/*
220 * Register upcall device.
221 * Linear target doesn't need any upcall devices but other targets like
222 * mirror, snapshot, multipath, stripe will use this functionality.
223 */
5c411e8e 224static int
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225dm_target_linear_upcall(dm_table_entry_t * table_en, struct buf * bp)
226{
227 return 0;
228}
229/*
230 * Transform char s to uint64_t offset number.
231 */
232uint64_t
1446934e 233atoi64(const char *s)
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234{
235 uint64_t n;
236 n = 0;
237
238 while (*s != '\0') {
239 if (!isdigit(*s))
240 break;
241
242 n = (10 * n) + (*s - '0');
243 s++;
244 }
245
246 return n;
247}
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248
249static int
250dmtl_mod_handler(module_t mod, int type, void *unused)
251{
252 dm_target_t *dmt = NULL;
253 int err = 0;
254
255 switch(type) {
256 case MOD_LOAD:
257 if ((dmt = dm_target_lookup("linear")) != NULL) {
258 dm_target_unbusy(dmt);
259 return EEXIST;
260 }
261 dmt = dm_target_alloc("linear");
262 dmt->version[0] = 1;
263 dmt->version[1] = 0;
264 dmt->version[2] = 2;
265 strlcpy(dmt->name, "linear", DM_MAX_TYPE_NAME);
266 dmt->init = &dm_target_linear_init;
267 dmt->status = &dm_target_linear_status;
268 dmt->strategy = &dm_target_linear_strategy;
269 dmt->deps = &dm_target_linear_deps;
270 dmt->destroy = &dm_target_linear_destroy;
271 dmt->upcall = &dm_target_linear_upcall;
272 dmt->dump = &dm_target_linear_dump;
273
274 err = dm_target_insert(dmt);
275 if (err == 0)
276 kprintf("dm_target_linear: Successfully initialized\n");
277 break;
278
279 case MOD_UNLOAD:
280 err = dm_target_rem("linear");
281 if (err == 0)
282 kprintf("dm_target_linear: unloaded\n");
283 break;
284
285 default:
286 break;
287 }
288
289 return err;
290}
291
292DM_TARGET_MODULE(dm_target_linear, dmtl_mod_handler);