dm - undo my pointless moving of dm.h
[dragonfly.git] / sys / dev / disk / dm / targets / striped / dm_target_striped.c
CommitLineData
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1/*
2 * Copyright (c) 2009 The NetBSD Foundation, Inc.
3 * All rights reserved.
4 *
5 * This code is derived from software contributed to The NetBSD Foundation
6 * by Adam Hamsik.
7 *
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8 * This code is further derived from software contributed to the
9 * DragonFly project by Alex Hornung and Matthew Dillon
10 *
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11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
30 * POSSIBILITY OF SUCH DAMAGE.
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31 *
32 * $NetBSD: dm_target_stripe.c,v 1.9 2010/01/04 00:14:41 haad Exp $
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33 */
34
35/*
36 * This file implements initial version of device-mapper stripe target.
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37 *
38 * DragonFly changes: Increase to an unlimited number of stripes
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39 */
40#include <sys/types.h>
41#include <sys/param.h>
42
43#include <sys/buf.h>
5b279a20 44#include <sys/malloc.h>
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45#include <sys/vnode.h>
46
a84e173e 47#include <dev/disk/dm/dm.h>
5b279a20 48MALLOC_DEFINE(M_DMSTRIPE, "dm_stripe", "Device Mapper Target Stripe");
ff56536e 49
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50static void dm_target_stripe_destroy_config(dm_target_stripe_config_t *tsc);
51
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52/*
53 * Init function called from dm_table_load_ioctl.
1446934e 54 *
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55 * Example line sent to dm from lvm tools when using striped target.
56 * start length striped #stripes chunk_size device1 offset1 ... deviceN offsetN
57 * 0 65536 striped 2 512 /dev/hda 0 /dev/hdb 0
58 */
5c411e8e 59static int
1446934e 60dm_target_stripe_init(dm_dev_t *dmv, void **target_config, char *params)
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61{
62 dm_target_stripe_config_t *tsc;
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63 int n;
64 char *ap;
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65
66 if (params == NULL)
67 return EINVAL;
68
ff56536e 69 /*
1446934e 70 * nstripes
ff56536e 71 */
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72 ap = strsep(&params, " \t");
73 if (ap == NULL)
74 return EINVAL;
75 n = (int)atoi64(ap);
76 if (n < 0 || n > MAX_STRIPES) {
77 kprintf("dm: Error %d stripes not supported (%d max)\n",
78 n, MAX_STRIPES);
ff56536e 79 return ENOTSUP;
1446934e 80 }
ff56536e 81
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82 tsc = kmalloc(sizeof(dm_target_stripe_config_t),
83 M_DMSTRIPE, M_WAITOK | M_ZERO);
84 tsc->stripe_num = n;
ff56536e 85
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86 ap = strsep(&params, " \t");
87 if (ap == NULL)
88 return EINVAL;
89 tsc->stripe_chunksize = atoi64(ap);
90 if (tsc->stripe_chunksize < 1 ||
91 tsc->stripe_chunksize * DEV_BSIZE > MAXPHYS) {
92 kprintf("dm: Error unsupported chunk size %jdKB\n",
93 (intmax_t)tsc->stripe_chunksize * DEV_BSIZE / 1024);
94 dm_target_stripe_destroy_config(tsc);
95 return EINVAL;
96 }
ff56536e 97
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98 /*
99 * Parse the devices
100 */
ff56536e 101
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102 kprintf("dm: Stripe %d devices chunk size %dKB\n",
103 (int)tsc->stripe_num,
104 (int)tsc->stripe_chunksize
105 );
ff56536e 106
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107 for (n = 0; n < tsc->stripe_num; ++n) {
108 ap = strsep(&params, " \t");
109 if (ap == NULL)
110 break;
111 tsc->stripe_devs[n].pdev = dm_pdev_insert(ap);
112 if (tsc->stripe_devs[n].pdev == NULL)
113 break;
114 ap = strsep(&params, " \t");
115 if (ap == NULL)
116 break;
117 tsc->stripe_devs[n].offset = atoi64(ap);
118 }
119 if (n != tsc->stripe_num) {
120 dm_target_stripe_destroy_config(tsc);
121 return (ENOENT);
122 }
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123
124 *target_config = tsc;
125
126 dmv->dev_type = DM_STRIPE_DEV;
127
128 return 0;
129}
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130
131/*
132 * Status routine called to get params string.
133 */
5c411e8e 134static char *
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135dm_target_stripe_status(void *target_config)
136{
137 dm_target_stripe_config_t *tsc;
138 char *params;
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139 char *ptr;
140 size_t len;
141 size_t nlen;
142 int n;
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143
144 tsc = target_config;
145
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146 /* caller expects use of M_DM for returned params */
147 nlen = DM_MAX_PARAMS_SIZE;
148 params = kmalloc(nlen, M_DM, M_WAITOK);
149 ptr = params;
150
151 ksnprintf(ptr, nlen, "%d %jd",
152 tsc->stripe_num, (intmax_t)tsc->stripe_chunksize);
153 len = strlen(params);
154 ptr += len;
155 nlen -= len;
156
157 for (n = 0; n < tsc->stripe_num; ++n) {
158 ksnprintf(ptr, nlen, " %s %jd",
159 tsc->stripe_devs[n].pdev->name,
160 (intmax_t)tsc->stripe_devs[n].offset);
161 len = strlen(ptr);
162 ptr += len;
163 nlen -= len;
164 }
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165
166 return params;
167}
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168
169/*
170 * Strategy routine called from dm_strategy.
171 */
5c411e8e 172static int
1446934e 173dm_target_stripe_strategy(dm_table_entry_t *table_en, struct buf *bp)
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174{
175 dm_target_stripe_config_t *tsc;
5b279a20 176 struct bio *bio = &bp->b_bio1;
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177 struct buf *nestbuf;
178 uint64_t blkno, blkoff;
3adc52bc 179 uint64_t stripe, blknr;
ff56536e 180 uint32_t stripe_off, stripe_rest, num_blks, issue_blks;
3adc52bc 181 int devnr;
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182
183 tsc = table_en->target_config;
184 if (tsc == NULL)
185 return 0;
186
ff56536e 187 /* calculate extent of request */
5b279a20 188 KKASSERT(bp->b_resid % DEV_BSIZE == 0);
ff56536e 189
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190 switch(bp->b_cmd) {
191 case BUF_CMD_READ:
192 case BUF_CMD_WRITE:
193 case BUF_CMD_FREEBLKS:
194 /*
195 * Loop through to individual operations
196 */
197 blkno = bp->b_bio1.bio_offset / DEV_BSIZE;
198 blkoff = 0;
199 num_blks = bp->b_resid / DEV_BSIZE;
200 nestiobuf_init(bio);
201
202 while (num_blks > 0) {
203 /* blockno to strip piece nr */
204 stripe = blkno / tsc->stripe_chunksize;
205 stripe_off = blkno % tsc->stripe_chunksize;
206
207 /* where we are inside the strip */
208 devnr = stripe % tsc->stripe_num;
209 blknr = stripe / tsc->stripe_num;
210
211 /* how much is left before we hit a boundary */
212 stripe_rest = tsc->stripe_chunksize - stripe_off;
213
214 /* issue this piece on stripe `stripe' */
215 issue_blks = MIN(stripe_rest, num_blks);
216 nestbuf = getpbuf(NULL);
f6221ad1 217 nestbuf->b_flags |= bio->bio_buf->b_flags & B_HASBOGUS;
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218
219 nestiobuf_add(bio, nestbuf, blkoff,
3b48c3c1 220 issue_blks * DEV_BSIZE, NULL);
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221
222 /* I need number of bytes. */
223 nestbuf->b_bio1.bio_offset =
224 blknr * tsc->stripe_chunksize + stripe_off;
225 nestbuf->b_bio1.bio_offset +=
226 tsc->stripe_devs[devnr].offset;
227 nestbuf->b_bio1.bio_offset *= DEV_BSIZE;
228
229 vn_strategy(tsc->stripe_devs[devnr].pdev->pdev_vnode,
230 &nestbuf->b_bio1);
231
232 blkno += issue_blks;
233 blkoff += issue_blks * DEV_BSIZE;
234 num_blks -= issue_blks;
235 }
236 nestiobuf_start(bio);
237 break;
238 case BUF_CMD_FLUSH:
239 nestiobuf_init(bio);
240 for (devnr = 0; devnr < tsc->stripe_num; ++devnr) {
241 nestbuf = getpbuf(NULL);
f6221ad1 242 nestbuf->b_flags |= bio->bio_buf->b_flags & B_HASBOGUS;
3adc52bc 243
3b48c3c1 244 nestiobuf_add(bio, nestbuf, 0, 0, NULL);
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245 nestbuf->b_bio1.bio_offset = 0;
246 vn_strategy(tsc->stripe_devs[devnr].pdev->pdev_vnode,
247 &nestbuf->b_bio1);
248 }
249 nestiobuf_start(bio);
250 break;
251 default:
252 bp->b_flags |= B_ERROR;
253 bp->b_error = EIO;
254 biodone(bio);
255 break;
ff56536e 256 }
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257 return 0;
258}
1446934e 259
79b7159f 260
5c411e8e 261static int
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262dm_target_stripe_dump(dm_table_entry_t *table_en, void *data, size_t length, off_t offset)
263{
264 dm_target_stripe_config_t *tsc;
265 uint64_t blkno, blkoff;
266 uint64_t stripe, blknr;
267 uint32_t stripe_off, stripe_rest, num_blks, issue_blks;
268 uint64_t off2, len2;
269 int devnr;
270
271 tsc = table_en->target_config;
272 if (tsc == NULL)
273 return 0;
274
275 /* calculate extent of request */
276 KKASSERT(length % DEV_BSIZE == 0);
277
278 blkno = offset / DEV_BSIZE;
279 blkoff = 0;
280 num_blks = length / DEV_BSIZE;
281
282 /*
283 * 0 length means flush buffers and return
284 */
285 if (length == 0) {
286 for (devnr = 0; devnr < tsc->stripe_num; ++devnr) {
287 if (tsc->stripe_devs[devnr].pdev->pdev_vnode->v_rdev == NULL)
288 return ENXIO;
289
290 dev_ddump(tsc->stripe_devs[devnr].pdev->pdev_vnode->v_rdev,
291 data, 0, offset, 0);
292 }
293 return 0;
294 }
295
296 while (num_blks > 0) {
297 /* blockno to strip piece nr */
298 stripe = blkno / tsc->stripe_chunksize;
299 stripe_off = blkno % tsc->stripe_chunksize;
300
301 /* where we are inside the strip */
302 devnr = stripe % tsc->stripe_num;
303 blknr = stripe / tsc->stripe_num;
304
305 /* how much is left before we hit a boundary */
306 stripe_rest = tsc->stripe_chunksize - stripe_off;
307
308 /* issue this piece on stripe `stripe' */
309 issue_blks = MIN(stripe_rest, num_blks);
310
311#if 0
312 nestiobuf_add(bio, nestbuf, blkoff,
313 issue_blks * DEV_BSIZE);
314#endif
315 len2 = issue_blks * DEV_BSIZE;
316
317 /* I need number of bytes. */
318 off2 = blknr * tsc->stripe_chunksize + stripe_off;
319 off2 += tsc->stripe_devs[devnr].offset;
320 off2 *= DEV_BSIZE;
321 off2 = dm_pdev_correct_dump_offset(tsc->stripe_devs[devnr].pdev,
322 off2);
323
324 if (tsc->stripe_devs[devnr].pdev->pdev_vnode->v_rdev == NULL)
325 return ENXIO;
326
327 dev_ddump(tsc->stripe_devs[devnr].pdev->pdev_vnode->v_rdev,
328 (char *)data + blkoff, 0, off2, len2);
329
330 blkno += issue_blks;
331 blkoff += issue_blks * DEV_BSIZE;
332 num_blks -= issue_blks;
333 }
334
335 return 0;
336}
337
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338/*
339 * Destroy a dm table entry for stripes.
340 */
5c411e8e 341static int
1446934e 342dm_target_stripe_destroy(dm_table_entry_t *table_en)
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343{
344 dm_target_stripe_config_t *tsc;
345
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346 if ((tsc = table_en->target_config) != NULL) {
347 table_en->target_config = NULL;
348 dm_target_stripe_destroy_config(tsc);
349 }
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350
351 /* Unbusy target so we can unload it */
352 dm_target_unbusy(table_en->target);
353
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354 return 0;
355}
ff56536e 356
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357static void
358dm_target_stripe_destroy_config(dm_target_stripe_config_t *tsc)
359{
360 int n;
ff56536e 361
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362 for (n = 0; n < tsc->stripe_num; ++n) {
363 if (tsc->stripe_devs[n].pdev) {
364 dm_pdev_decr(tsc->stripe_devs[n].pdev);
365 tsc->stripe_devs[n].pdev = NULL;
366 }
367 }
368 kfree(tsc, M_DMSTRIPE);
ff56536e 369}
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370
371/*
372 * Generate properties from stripe table entry.
373 */
5c411e8e 374static int
1446934e 375dm_target_stripe_deps(dm_table_entry_t *table_en, prop_array_t prop_array)
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376{
377 dm_target_stripe_config_t *tsc;
378 struct vattr va;
ff56536e 379 int error;
1446934e 380 int n;
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381
382 if (table_en->target_config == NULL)
383 return ENOENT;
384
385 tsc = table_en->target_config;
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386 error = 0;
387 for (n = 0; n < tsc->stripe_num; ++n) {
388 error = VOP_GETATTR(tsc->stripe_devs[n].pdev->pdev_vnode, &va);
389 if (error)
390 break;
391 prop_array_add_uint64(prop_array,
392 (uint64_t)makeudev(va.va_rmajor, va.va_rminor));
393 }
394 return (error);
ff56536e 395}
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396
397/*
398 * Unsupported for this target.
399 */
5c411e8e 400static int
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401dm_target_stripe_upcall(dm_table_entry_t * table_en, struct buf * bp)
402{
403 return 0;
404}
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405
406static int
407dmts_mod_handler(module_t mod, int type, void *unused)
408{
409 dm_target_t *dmt = NULL;
410 int err = 0;
411
412 switch(type) {
413 case MOD_LOAD:
414 if ((dmt = dm_target_lookup("striped")) != NULL) {
415 dm_target_unbusy(dmt);
416 return EEXIST;
417 }
418 dmt = dm_target_alloc("striped");
419 dmt->version[0] = 1;
420 dmt->version[1] = 0;
421 dmt->version[2] = 3;
422 strlcpy(dmt->name, "striped", DM_MAX_TYPE_NAME);
423 dmt->init = &dm_target_stripe_init;
424 dmt->status = &dm_target_stripe_status;
425 dmt->strategy = &dm_target_stripe_strategy;
426 dmt->deps = &dm_target_stripe_deps;
427 dmt->destroy = &dm_target_stripe_destroy;
428 dmt->upcall = &dm_target_stripe_upcall;
429 dmt->dump = &dm_target_stripe_dump;
430
431 err = dm_target_insert(dmt);
432 if (err == 0)
433 kprintf("dm_target_stripe: Successfully initialized\n");
434 break;
435
436 case MOD_UNLOAD:
437 err = dm_target_rem("striped");
438 if (err == 0)
439 kprintf("dm_target_stripe: unloaded\n");
440 break;
441
442 default:
443 break;
444 }
445
446 return err;
447}
448
7115a22b 449DM_TARGET_MODULE(dm_target_striped, dmts_mod_handler);