1 | /* $NetBSD: dm_target_linear.c,v 1.14 2014/06/14 07:39:00 hannken 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> |
39 | |
40 | #include <sys/buf.h> |
41 | #include <sys/kmem.h> |
42 | #include <sys/vnode.h> |
43 | #include <sys/lwp.h> |
44 | |
45 | #include <machine/int_fmtio.h> |
46 | |
47 | #include "dm.h" |
48 | |
49 | /* |
50 | * Allocate target specific config data, and link them to table. |
51 | * This function is called only when, flags is not READONLY and |
52 | * therefore we can add things to pdev list. This should not a |
53 | * problem because this routine is called only from dm_table_load_ioctl. |
54 | * @argv[0] is name, |
55 | * @argv[1] is physical data offset. |
56 | */ |
57 | int |
58 | dm_target_linear_init(dm_dev_t * dmv, void **target_config, char *params) |
59 | { |
60 | dm_target_linear_config_t *tlc; |
61 | dm_pdev_t *dmp; |
62 | |
63 | char **ap, *argv[3]; |
64 | |
65 | if (params == NULL) |
66 | return EINVAL; |
67 | |
68 | /* |
69 | * Parse a string, containing tokens delimited by white space, |
70 | * into an argument vector |
71 | */ |
72 | for (ap = argv; ap < &argv[2] && |
73 | (*ap = strsep(¶ms, " \t" )) != NULL;) { |
74 | if (**ap != '\0') |
75 | ap++; |
76 | } |
77 | |
78 | aprint_debug("Linear target init function called %s--%s!!\n" , |
79 | argv[0], argv[1]); |
80 | |
81 | /* Insert dmp to global pdev list */ |
82 | if ((dmp = dm_pdev_insert(argv[0])) == NULL) |
83 | return ENOENT; |
84 | |
85 | if ((tlc = kmem_alloc(sizeof(dm_target_linear_config_t), KM_SLEEP)) |
86 | == NULL) |
87 | return ENOMEM; |
88 | |
89 | tlc->pdev = dmp; |
90 | tlc->offset = 0; /* default settings */ |
91 | |
92 | /* Check user input if it is not leave offset as 0. */ |
93 | tlc->offset = atoi(argv[1]); |
94 | |
95 | *target_config = tlc; |
96 | |
97 | dmv->dev_type = DM_LINEAR_DEV; |
98 | |
99 | return 0; |
100 | } |
101 | /* |
102 | * Status routine is called to get params string, which is target |
103 | * specific. When dm_table_status_ioctl is called with flag |
104 | * DM_STATUS_TABLE_FLAG I have to sent params string back. |
105 | */ |
106 | char * |
107 | dm_target_linear_status(void *target_config) |
108 | { |
109 | dm_target_linear_config_t *tlc; |
110 | char *params; |
111 | tlc = target_config; |
112 | |
113 | aprint_debug("Linear target status function called\n" ); |
114 | |
115 | if ((params = kmem_alloc(DM_MAX_PARAMS_SIZE, KM_NOSLEEP)) == NULL) |
116 | return NULL; |
117 | |
118 | aprint_normal("%s %" PRIu64, tlc->pdev->name, tlc->offset); |
119 | snprintf(params, DM_MAX_PARAMS_SIZE, "%s %" PRIu64, |
120 | tlc->pdev->name, tlc->offset); |
121 | |
122 | return params; |
123 | } |
124 | /* |
125 | * Do IO operation, called from dmstrategy routine. |
126 | */ |
127 | int |
128 | dm_target_linear_strategy(dm_table_entry_t * table_en, struct buf * bp) |
129 | { |
130 | dm_target_linear_config_t *tlc; |
131 | |
132 | tlc = table_en->target_config; |
133 | |
134 | /* printf("Linear target read function called %" PRIu64 "!!\n", |
135 | tlc->offset);*/ |
136 | |
137 | bp->b_blkno += tlc->offset; |
138 | |
139 | VOP_STRATEGY(tlc->pdev->pdev_vnode, bp); |
140 | |
141 | return 0; |
142 | |
143 | } |
144 | /* |
145 | * Sync underlying disk caches. |
146 | */ |
147 | int |
148 | dm_target_linear_sync(dm_table_entry_t * table_en) |
149 | { |
150 | int cmd; |
151 | dm_target_linear_config_t *tlc; |
152 | |
153 | tlc = table_en->target_config; |
154 | |
155 | cmd = 1; |
156 | |
157 | return VOP_IOCTL(tlc->pdev->pdev_vnode, DIOCCACHESYNC, &cmd, |
158 | FREAD|FWRITE, kauth_cred_get()); |
159 | } |
160 | /* |
161 | * Destroy target specific data. Decrement table pdevs. |
162 | */ |
163 | int |
164 | dm_target_linear_destroy(dm_table_entry_t * table_en) |
165 | { |
166 | dm_target_linear_config_t *tlc; |
167 | |
168 | /* |
169 | * Destroy function is called for every target even if it |
170 | * doesn't have target_config. |
171 | */ |
172 | |
173 | if (table_en->target_config == NULL) |
174 | return 0; |
175 | |
176 | tlc = table_en->target_config; |
177 | |
178 | /* Decrement pdev ref counter if 0 remove it */ |
179 | dm_pdev_decr(tlc->pdev); |
180 | |
181 | /* Unbusy target so we can unload it */ |
182 | dm_target_unbusy(table_en->target); |
183 | |
184 | kmem_free(table_en->target_config, sizeof(dm_target_linear_config_t)); |
185 | |
186 | table_en->target_config = NULL; |
187 | |
188 | return 0; |
189 | } |
190 | /* Add this target pdev dependiences to prop_array_t */ |
191 | int |
192 | dm_target_linear_deps(dm_table_entry_t * table_en, prop_array_t prop_array) |
193 | { |
194 | dm_target_linear_config_t *tlc; |
195 | |
196 | if (table_en->target_config == NULL) |
197 | return ENOENT; |
198 | |
199 | tlc = table_en->target_config; |
200 | |
201 | prop_array_add_uint64(prop_array, |
202 | (uint64_t) tlc->pdev->pdev_vnode->v_rdev); |
203 | |
204 | return 0; |
205 | } |
206 | /* |
207 | * Register upcall device. |
208 | * Linear target doesn't need any upcall devices but other targets like |
209 | * mirror, snapshot, multipath, stripe will use this functionality. |
210 | */ |
211 | int |
212 | dm_target_linear_upcall(dm_table_entry_t * table_en, struct buf * bp) |
213 | { |
214 | return 0; |
215 | } |
216 | /* |
217 | * Query physical block size of this target |
218 | * For a linear target this is just the sector size of the underlying device |
219 | */ |
220 | int |
221 | dm_target_linear_secsize(dm_table_entry_t * table_en, unsigned *secsizep) |
222 | { |
223 | dm_target_linear_config_t *tlc; |
224 | unsigned secsize; |
225 | |
226 | secsize = 0; |
227 | |
228 | tlc = table_en->target_config; |
229 | if (tlc != NULL) |
230 | secsize = tlc->pdev->pdev_secsize; |
231 | |
232 | *secsizep = secsize; |
233 | |
234 | return 0; |
235 | } |
236 | /* |
237 | * Transform char s to uint64_t offset number. |
238 | */ |
239 | uint64_t |
240 | atoi(const char *s) |
241 | { |
242 | uint64_t n; |
243 | n = 0; |
244 | |
245 | while (*s != '\0') { |
246 | if (!isdigit(*s)) |
247 | break; |
248 | |
249 | n = (10 * n) + (*s - '0'); |
250 | s++; |
251 | } |
252 | |
253 | return n; |
254 | } |
255 | |