1 /* $NetBSD: dm_target_linear.c,v 1.9 2010/01/04 00:14:41 haad Exp $ */
4 * Copyright (c) 2008 The NetBSD Foundation, Inc.
7 * This code is derived from software contributed to The NetBSD Foundation
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
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.
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.
34 * This file implements initial version of device-mapper dklinear target.
37 #include <sys/types.h>
40 #include <sys/malloc.h>
41 #include <sys/vnode.h>
43 #include <dev/disk/dm/dm.h>
44 MALLOC_DEFINE(M_DMLINEAR
, "dm_linear", "Device Mapper Target Linear");
46 typedef struct target_linear_config
{
49 } dm_target_linear_config_t
;
52 * Allocate target specific config data, and link them to table.
53 * This function is called only when, flags is not READONLY and
54 * therefore we can add things to pdev list. This should not a
55 * problem because this routine is called only from dm_table_load_ioctl.
57 * @argv[1] is physical data offset.
60 dm_target_linear_init(dm_table_entry_t
*table_en
, int argc
, char **argv
)
62 dm_target_linear_config_t
*tlc
;
66 kprintf("Linear target takes 2 args\n");
70 aprint_debug("Linear target init function called %s--%s!!\n",
73 /* Insert dmp to global pdev list */
74 if ((dmp
= dm_pdev_insert(argv
[0])) == NULL
)
77 if ((tlc
= kmalloc(sizeof(dm_target_linear_config_t
), M_DMLINEAR
, M_WAITOK
))
82 tlc
->offset
= atoi64(argv
[1]);
84 dm_table_add_deps(table_en
, dmp
);
86 dm_table_init_target(table_en
, DM_LINEAR_DEV
, tlc
);
91 * Table routine is called to get params string, which is target
92 * specific. When dm_table_status_ioctl is called with flag
93 * DM_STATUS_TABLE_FLAG I have to sent params string back.
96 dm_target_linear_table(void *target_config
)
98 dm_target_linear_config_t
*tlc
;
102 aprint_debug("Linear target table function called\n");
104 params
= dm_alloc_string(DM_MAX_PARAMS_SIZE
);
106 ksnprintf(params
, DM_MAX_PARAMS_SIZE
, "%s %" PRIu64
,
107 tlc
->pdev
->udev_name
, tlc
->offset
);
112 * Do IO operation, called from dmstrategy routine.
115 dm_target_linear_strategy(dm_table_entry_t
*table_en
, struct buf
*bp
)
117 dm_target_linear_config_t
*tlc
;
119 tlc
= table_en
->target_config
;
121 /* kprintf("Linear target read function called %" PRIu64 "!!\n",
124 bp
->b_bio1
.bio_offset
+= tlc
->offset
* DEV_BSIZE
;
126 vn_strategy(tlc
->pdev
->pdev_vnode
, &bp
->b_bio1
);
133 dm_target_linear_dump(dm_table_entry_t
*table_en
, void *data
, size_t length
, off_t offset
)
135 dm_target_linear_config_t
*tlc
;
137 tlc
= table_en
->target_config
;
139 offset
+= tlc
->offset
* DEV_BSIZE
;
140 offset
= dm_pdev_correct_dump_offset(tlc
->pdev
, offset
);
142 if (tlc
->pdev
->pdev_vnode
->v_rdev
== NULL
)
145 return dev_ddump(tlc
->pdev
->pdev_vnode
->v_rdev
, data
, 0, offset
, length
);
149 * Destroy target specific data. Decrement table pdevs.
152 dm_target_linear_destroy(dm_table_entry_t
*table_en
)
154 dm_target_linear_config_t
*tlc
;
157 * Destroy function is called for every target even if it
158 * doesn't have target_config.
161 if (table_en
->target_config
== NULL
)
164 tlc
= table_en
->target_config
;
166 /* Decrement pdev ref counter if 0 remove it */
167 dm_pdev_decr(tlc
->pdev
);
169 kfree(table_en
->target_config
, M_DMLINEAR
);
171 table_en
->target_config
= NULL
;
177 dmtl_mod_handler(module_t mod
, int type
, void *unused
)
179 dm_target_t
*dmt
= NULL
;
184 if ((dmt
= dm_target_lookup("linear")) != NULL
) {
185 dm_target_unbusy(dmt
);
188 dmt
= dm_target_alloc("linear");
192 strlcpy(dmt
->name
, "linear", DM_MAX_TYPE_NAME
);
193 dmt
->init
= &dm_target_linear_init
;
194 dmt
->table
= &dm_target_linear_table
;
195 dmt
->strategy
= &dm_target_linear_strategy
;
196 dmt
->destroy
= &dm_target_linear_destroy
;
197 dmt
->dump
= &dm_target_linear_dump
;
199 err
= dm_target_insert(dmt
);
201 kprintf("dm_target_linear: Successfully initialized\n");
205 err
= dm_target_rem("linear");
207 kprintf("dm_target_linear: unloaded\n");
217 DM_TARGET_MODULE(dm_target_linear
, dmtl_mod_handler
);