xref: /dflybsd-src/sys/dev/disk/dm/linear/dm_target_linear.c (revision 8477f730259ff96c34fdc0168832038bf1bff338)
1f603807bSTomohiro Kusumi /*        $NetBSD: dm_target_linear.c,v 1.9 2010/01/04 00:14:41 haad Exp $      */
2f603807bSTomohiro Kusumi 
3f603807bSTomohiro Kusumi /*
4f603807bSTomohiro Kusumi  * Copyright (c) 2008 The NetBSD Foundation, Inc.
5f603807bSTomohiro Kusumi  * All rights reserved.
6f603807bSTomohiro Kusumi  *
7f603807bSTomohiro Kusumi  * This code is derived from software contributed to The NetBSD Foundation
8f603807bSTomohiro Kusumi  * by Adam Hamsik.
9f603807bSTomohiro Kusumi  *
10f603807bSTomohiro Kusumi  * Redistribution and use in source and binary forms, with or without
11f603807bSTomohiro Kusumi  * modification, are permitted provided that the following conditions
12f603807bSTomohiro Kusumi  * are met:
13f603807bSTomohiro Kusumi  * 1. Redistributions of source code must retain the above copyright
14f603807bSTomohiro Kusumi  *    notice, this list of conditions and the following disclaimer.
15f603807bSTomohiro Kusumi  * 2. Redistributions in binary form must reproduce the above copyright
16f603807bSTomohiro Kusumi  *    notice, this list of conditions and the following disclaimer in the
17f603807bSTomohiro Kusumi  *    documentation and/or other materials provided with the distribution.
18f603807bSTomohiro Kusumi  *
19f603807bSTomohiro Kusumi  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20f603807bSTomohiro Kusumi  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21f603807bSTomohiro Kusumi  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22f603807bSTomohiro Kusumi  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23f603807bSTomohiro Kusumi  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24f603807bSTomohiro Kusumi  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25f603807bSTomohiro Kusumi  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26f603807bSTomohiro Kusumi  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27f603807bSTomohiro Kusumi  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28f603807bSTomohiro Kusumi  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29f603807bSTomohiro Kusumi  * POSSIBILITY OF SUCH DAMAGE.
30f603807bSTomohiro Kusumi  */
31f603807bSTomohiro Kusumi 
32f603807bSTomohiro Kusumi 
33f603807bSTomohiro Kusumi /*
34f603807bSTomohiro Kusumi  * This file implements initial version of device-mapper dklinear target.
35f603807bSTomohiro Kusumi  */
36f603807bSTomohiro Kusumi 
37f603807bSTomohiro Kusumi #include <dev/disk/dm/dm.h>
38*8477f730Szrj #include <sys/malloc.h>		/* for malloc macros, dm.h includes sys/param.h */
39*8477f730Szrj 
40f603807bSTomohiro Kusumi MALLOC_DEFINE(M_DMLINEAR, "dm_linear", "Device Mapper Target Linear");
41f603807bSTomohiro Kusumi 
42f603807bSTomohiro Kusumi typedef struct target_linear_config {
43f603807bSTomohiro Kusumi 	dm_pdev_t *pdev;
44f603807bSTomohiro Kusumi 	uint64_t offset;
45f603807bSTomohiro Kusumi } dm_target_linear_config_t;
46f603807bSTomohiro Kusumi 
47f603807bSTomohiro Kusumi /*
48f603807bSTomohiro Kusumi  * Allocate target specific config data, and link them to table.
49f603807bSTomohiro Kusumi  * This function is called only when, flags is not READONLY and
50f603807bSTomohiro Kusumi  * therefore we can add things to pdev list. This should not a
51f603807bSTomohiro Kusumi  * problem because this routine is called only from dm_table_load_ioctl.
52f603807bSTomohiro Kusumi  * @argv[0] is name,
53f603807bSTomohiro Kusumi  * @argv[1] is physical data offset.
54f603807bSTomohiro Kusumi  */
55f603807bSTomohiro Kusumi static int
dm_target_linear_init(dm_table_entry_t * table_en,int argc,char ** argv)56f603807bSTomohiro Kusumi dm_target_linear_init(dm_table_entry_t *table_en, int argc, char **argv)
57f603807bSTomohiro Kusumi {
58f603807bSTomohiro Kusumi 	dm_target_linear_config_t *tlc;
59f603807bSTomohiro Kusumi 	dm_pdev_t *dmp;
60f603807bSTomohiro Kusumi 
61f603807bSTomohiro Kusumi 	if (argc != 2) {
62f603807bSTomohiro Kusumi 		kprintf("Linear target takes 2 args\n");
63f603807bSTomohiro Kusumi 		return EINVAL;
64f603807bSTomohiro Kusumi 	}
65f603807bSTomohiro Kusumi 
66f603807bSTomohiro Kusumi 	/* Insert dmp to global pdev list */
67f603807bSTomohiro Kusumi 	if ((dmp = dm_pdev_insert(argv[0])) == NULL)
68f603807bSTomohiro Kusumi 		return ENOENT;
69f603807bSTomohiro Kusumi 
70f603807bSTomohiro Kusumi 	if ((tlc = kmalloc(sizeof(dm_target_linear_config_t), M_DMLINEAR, M_WAITOK))
71f603807bSTomohiro Kusumi 	    == NULL)
72f603807bSTomohiro Kusumi 		return ENOMEM;
73f603807bSTomohiro Kusumi 
74f603807bSTomohiro Kusumi 	tlc->pdev = dmp;
75f603807bSTomohiro Kusumi 	tlc->offset = atoi64(argv[1]);
76f603807bSTomohiro Kusumi 
77f603807bSTomohiro Kusumi 	dm_table_add_deps(table_en, dmp);
78f603807bSTomohiro Kusumi 
7941a68322STomohiro Kusumi 	dm_table_init_target(table_en, tlc);
80f603807bSTomohiro Kusumi 
81f603807bSTomohiro Kusumi 	return 0;
82f603807bSTomohiro Kusumi }
83f603807bSTomohiro Kusumi 
84f603807bSTomohiro Kusumi /*
85f603807bSTomohiro Kusumi  * Table routine is called to get params string, which is target
86f603807bSTomohiro Kusumi  * specific. When dm_table_status_ioctl is called with flag
87f603807bSTomohiro Kusumi  * DM_STATUS_TABLE_FLAG I have to sent params string back.
88f603807bSTomohiro Kusumi  */
89f603807bSTomohiro Kusumi static char *
dm_target_linear_table(void * target_config)90f603807bSTomohiro Kusumi dm_target_linear_table(void *target_config)
91f603807bSTomohiro Kusumi {
92f603807bSTomohiro Kusumi 	dm_target_linear_config_t *tlc;
93f603807bSTomohiro Kusumi 	char *params;
94f603807bSTomohiro Kusumi 	tlc = target_config;
95f603807bSTomohiro Kusumi 
96f603807bSTomohiro Kusumi 	params = dm_alloc_string(DM_MAX_PARAMS_SIZE);
97f603807bSTomohiro Kusumi 
98f603807bSTomohiro Kusumi 	ksnprintf(params, DM_MAX_PARAMS_SIZE, "%s %" PRIu64,
99f603807bSTomohiro Kusumi 	    tlc->pdev->udev_name, tlc->offset);
100f603807bSTomohiro Kusumi 
101f603807bSTomohiro Kusumi 	return params;
102f603807bSTomohiro Kusumi }
103f603807bSTomohiro Kusumi 
104f603807bSTomohiro Kusumi /*
105f603807bSTomohiro Kusumi  * Do IO operation, called from dmstrategy routine.
106f603807bSTomohiro Kusumi  */
107f603807bSTomohiro Kusumi static int
dm_target_linear_strategy(dm_table_entry_t * table_en,struct buf * bp)108f603807bSTomohiro Kusumi dm_target_linear_strategy(dm_table_entry_t *table_en, struct buf *bp)
109f603807bSTomohiro Kusumi {
110f603807bSTomohiro Kusumi 	dm_target_linear_config_t *tlc;
111f603807bSTomohiro Kusumi 
112f603807bSTomohiro Kusumi 	tlc = table_en->target_config;
113f603807bSTomohiro Kusumi 
114f603807bSTomohiro Kusumi 	bp->b_bio1.bio_offset += tlc->offset * DEV_BSIZE;
115f603807bSTomohiro Kusumi 
116f603807bSTomohiro Kusumi 	vn_strategy(tlc->pdev->pdev_vnode, &bp->b_bio1);
117f603807bSTomohiro Kusumi 
118f603807bSTomohiro Kusumi 	return 0;
119f603807bSTomohiro Kusumi 
120f603807bSTomohiro Kusumi }
121f603807bSTomohiro Kusumi 
122f603807bSTomohiro Kusumi static int
dm_target_linear_dump(dm_table_entry_t * table_en,void * data,size_t length,off_t offset)123f603807bSTomohiro Kusumi dm_target_linear_dump(dm_table_entry_t *table_en, void *data, size_t length, off_t offset)
124f603807bSTomohiro Kusumi {
125f603807bSTomohiro Kusumi 	dm_target_linear_config_t *tlc;
126f603807bSTomohiro Kusumi 
127f603807bSTomohiro Kusumi 	tlc = table_en->target_config;
128f603807bSTomohiro Kusumi 
129f603807bSTomohiro Kusumi 	offset += tlc->offset * DEV_BSIZE;
130f603807bSTomohiro Kusumi 	offset = dm_pdev_correct_dump_offset(tlc->pdev, offset);
131f603807bSTomohiro Kusumi 
132f603807bSTomohiro Kusumi 	if (tlc->pdev->pdev_vnode->v_rdev == NULL)
133f603807bSTomohiro Kusumi 		return ENXIO;
134f603807bSTomohiro Kusumi 
135f603807bSTomohiro Kusumi 	return dev_ddump(tlc->pdev->pdev_vnode->v_rdev, data, 0, offset, length);
136f603807bSTomohiro Kusumi }
137f603807bSTomohiro Kusumi 
138f603807bSTomohiro Kusumi /*
139f603807bSTomohiro Kusumi  * Destroy target specific data. Decrement table pdevs.
140f603807bSTomohiro Kusumi  */
141f603807bSTomohiro Kusumi static int
dm_target_linear_destroy(dm_table_entry_t * table_en)142f603807bSTomohiro Kusumi dm_target_linear_destroy(dm_table_entry_t *table_en)
143f603807bSTomohiro Kusumi {
144f603807bSTomohiro Kusumi 	dm_target_linear_config_t *tlc;
145f603807bSTomohiro Kusumi 
146f603807bSTomohiro Kusumi 	/*
147f603807bSTomohiro Kusumi 	 * Destroy function is called for every target even if it
148f603807bSTomohiro Kusumi 	 * doesn't have target_config.
149f603807bSTomohiro Kusumi 	 */
150f603807bSTomohiro Kusumi 
151f603807bSTomohiro Kusumi 	if (table_en->target_config == NULL)
152f603807bSTomohiro Kusumi 		return 0;
153f603807bSTomohiro Kusumi 
154f603807bSTomohiro Kusumi 	tlc = table_en->target_config;
155f603807bSTomohiro Kusumi 
156f603807bSTomohiro Kusumi 	/* Decrement pdev ref counter if 0 remove it */
157f603807bSTomohiro Kusumi 	dm_pdev_decr(tlc->pdev);
158f603807bSTomohiro Kusumi 
159f603807bSTomohiro Kusumi 	kfree(table_en->target_config, M_DMLINEAR);
160f603807bSTomohiro Kusumi 
161f603807bSTomohiro Kusumi 	return 0;
162f603807bSTomohiro Kusumi }
163f603807bSTomohiro Kusumi 
164f603807bSTomohiro Kusumi static int
dmtl_mod_handler(module_t mod,int type,void * unused)165f603807bSTomohiro Kusumi dmtl_mod_handler(module_t mod, int type, void *unused)
166f603807bSTomohiro Kusumi {
167f603807bSTomohiro Kusumi 	dm_target_t *dmt = NULL;
168f603807bSTomohiro Kusumi 	int err = 0;
169f603807bSTomohiro Kusumi 
170f603807bSTomohiro Kusumi 	switch(type) {
171f603807bSTomohiro Kusumi 	case MOD_LOAD:
172f603807bSTomohiro Kusumi 		if ((dmt = dm_target_lookup("linear")) != NULL) {
173f603807bSTomohiro Kusumi 			dm_target_unbusy(dmt);
174f603807bSTomohiro Kusumi 			return EEXIST;
175f603807bSTomohiro Kusumi 		}
176f603807bSTomohiro Kusumi 		dmt = dm_target_alloc("linear");
177f603807bSTomohiro Kusumi 		dmt->version[0] = 1;
178f603807bSTomohiro Kusumi 		dmt->version[1] = 0;
179f603807bSTomohiro Kusumi 		dmt->version[2] = 2;
180f603807bSTomohiro Kusumi 		dmt->init = &dm_target_linear_init;
181f603807bSTomohiro Kusumi 		dmt->destroy = &dm_target_linear_destroy;
182f603807bSTomohiro Kusumi 		dmt->strategy = &dm_target_linear_strategy;
183f603807bSTomohiro Kusumi 		dmt->table = &dm_target_linear_table;
184f603807bSTomohiro Kusumi 		dmt->dump = &dm_target_linear_dump;
185f603807bSTomohiro Kusumi 
186f603807bSTomohiro Kusumi 		err = dm_target_insert(dmt);
187f603807bSTomohiro Kusumi 		if (err == 0)
188f603807bSTomohiro Kusumi 			kprintf("dm_target_linear: Successfully initialized\n");
189f603807bSTomohiro Kusumi 		break;
190f603807bSTomohiro Kusumi 
191f603807bSTomohiro Kusumi 	case MOD_UNLOAD:
192f603807bSTomohiro Kusumi 		err = dm_target_remove("linear");
193f603807bSTomohiro Kusumi 		if (err == 0)
194f603807bSTomohiro Kusumi 			kprintf("dm_target_linear: unloaded\n");
195f603807bSTomohiro Kusumi 		break;
196f603807bSTomohiro Kusumi 	}
197f603807bSTomohiro Kusumi 
198f603807bSTomohiro Kusumi 	return err;
199f603807bSTomohiro Kusumi }
200f603807bSTomohiro Kusumi 
201f603807bSTomohiro Kusumi DM_TARGET_MODULE(dm_target_linear, dmtl_mod_handler);
202