2 * Copyright (c) 2009 The NetBSD Foundation, Inc.
5 * This code is derived from software contributed to The NetBSD Foundation
8 * This code is further derived from software contributed to the
9 * DragonFly project by Alex Hornung and Matthew Dillon
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
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.
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.
32 * $NetBSD: dm_target_stripe.c,v 1.9 2010/01/04 00:14:41 haad Exp $
36 * This file implements initial version of device-mapper stripe target.
38 * DragonFly changes: Increase to an unlimited number of stripes
40 #include <sys/malloc.h>
42 #include <dev/disk/dm/dm.h>
43 MALLOC_DEFINE(M_DMSTRIPE, "dm_striped", "Device Mapper Target Striped");
45 #define MAX_STRIPES 32
46 /* #define USE_NUM_ERROR */
48 struct target_stripe_dev {
54 typedef struct target_stripe_config {
56 uint64_t stripe_chunksize;
57 struct target_stripe_dev stripe_devs[0];
58 } dm_target_stripe_config_t;
60 static void dm_target_stripe_destroy_config(dm_target_stripe_config_t *tsc);
63 * Init function called from dm_table_load_ioctl.
65 * Example line sent to dm from lvm tools when using striped target.
66 * start length striped #stripes chunk_size device1 offset1 ... deviceN offsetN
69 dm_target_stripe_init(dm_table_entry_t *table_en, int argc, char **argv)
71 dm_target_stripe_config_t *tsc;
73 int i, n, siz, chunksize;
76 kprintf("Striped target takes 4 or more args\n");
80 n = (int)atoi64(argv[0]);
81 if (n <= 0 || n > MAX_STRIPES) {
82 kprintf("dm: Error %d stripes not supported (%d max)\n",
87 if (table_en->length % n) {
88 kprintf("dm: Target device size not multiple of stripes\n");
92 if (argc != (2 + n * 2)) {
93 kprintf("dm: Invalid argc %d for %d stripe devices\n",
98 chunksize = atoi64(argv[1]);
99 if (chunksize < 1 || chunksize * DEV_BSIZE > MAXPHYS) {
100 kprintf("dm: Error unsupported chunk size %jdKB\n",
101 (intmax_t)chunksize * DEV_BSIZE / 1024);
105 if ((table_en->length / n) % chunksize) {
106 kprintf("dm: Stripe device size not multiple of chunk size\n");
111 siz = sizeof(dm_target_stripe_config_t) +
112 n * sizeof(struct target_stripe_dev);
113 tsc = kmalloc(siz, M_DMSTRIPE, M_WAITOK | M_ZERO);
117 tsc->stripe_chunksize = chunksize;
123 kprintf("dm: Stripe %d devices chunk size %dKB\n",
124 (int)tsc->stripe_num,
125 (int)tsc->stripe_chunksize
129 for (n = 0, i = 0; n < tsc->stripe_num; ++n) {
132 tsc->stripe_devs[n].pdev = dm_pdev_insert(arg);
133 if (tsc->stripe_devs[n].pdev == NULL)
137 tsc->stripe_devs[n].offset = atoi64(arg);
138 dm_table_add_deps(table_en, tsc->stripe_devs[n].pdev);
140 if (n != tsc->stripe_num) {
141 dm_target_stripe_destroy_config(tsc);
145 dm_table_init_target(table_en, DM_STRIPE_DEV, tsc);
151 * Info routine called to get params string.
154 dm_target_stripe_info(void *target_config)
156 dm_target_stripe_config_t *tsc;
159 char buf[MAX_STRIPES + 1];
166 len = DM_MAX_PARAMS_SIZE;
167 params = dm_alloc_string(len);
170 ret = ksnprintf(ptr, len, "%d ", tsc->stripe_num);
174 memset(buf, 0, sizeof(buf));
175 for (i = 0; i < tsc->stripe_num; i++) {
176 ret = ksnprintf(ptr, len, "%s ",
177 tsc->stripe_devs[i].pdev->udev_name);
178 if (tsc->stripe_devs[i].num_error) /* no lock */
186 ret = ksnprintf(ptr, len, "1 %s", buf);
194 * Table routine called to get params string.
197 dm_target_stripe_table(void *target_config)
199 dm_target_stripe_config_t *tsc;
208 len = DM_MAX_PARAMS_SIZE;
209 params = dm_alloc_string(len);
212 ret = ksnprintf(ptr, len, "%d %jd",
214 (intmax_t)tsc->stripe_chunksize);
218 for (i = 0; i < tsc->stripe_num; i++) {
219 ret = ksnprintf(ptr, len, " %s %jd",
220 tsc->stripe_devs[i].pdev->udev_name,
221 (intmax_t)tsc->stripe_devs[i].offset);
231 dm_target_stripe_iodone(struct bio *bio)
235 dm_target_stripe_config_t *tsc;
238 tsc = bio->bio_caller_info1.ptr;
242 uint64_t blkno, stripe;
244 blkno = bio->bio_offset / DEV_BSIZE;
245 stripe = blkno / tsc->stripe_chunksize;
246 devnr = stripe % tsc->stripe_num;
247 KKASSERT(devnr < MAX_STRIPES);
248 tsc->stripe_devs[devnr].num_error++;
250 dmdebug("device=%d error=%d\n", devnr, bp->b_error);
258 struct bio *get_stripe_bio(struct bio *bio, void *priv)
262 nbio = push_bio(bio);
263 nbio->bio_caller_info1.ptr = priv;
264 nbio->bio_done = dm_target_stripe_iodone;
270 struct bio *get_stripe_bio(struct bio *bio, void *priv __unused)
277 * Strategy routine called from dm_strategy.
280 dm_target_stripe_strategy(dm_table_entry_t *table_en, struct buf *bp)
282 dm_target_stripe_config_t *tsc;
283 struct bio *bio = &bp->b_bio1;
286 struct target_stripe_dev *dev;
287 uint64_t blkno, blkoff;
288 uint64_t stripe, blknr;
289 uint32_t stripe_off, stripe_rest, num_blks, issue_blks;
292 tsc = table_en->target_config;
296 /* calculate extent of request */
297 KKASSERT(bp->b_resid % DEV_BSIZE == 0);
302 case BUF_CMD_FREEBLKS:
304 * Loop through to individual operations
306 blkno = bio->bio_offset / DEV_BSIZE;
308 num_blks = bp->b_resid / DEV_BSIZE;
311 while (num_blks > 0) {
312 /* blockno to stripe piece nr */
313 stripe = blkno / tsc->stripe_chunksize;
314 stripe_off = blkno % tsc->stripe_chunksize;
316 /* where we are inside the stripe */
317 devnr = stripe % tsc->stripe_num;
318 blknr = stripe / tsc->stripe_num;
319 dev = &tsc->stripe_devs[devnr];
321 /* how much is left before we hit a boundary */
322 stripe_rest = tsc->stripe_chunksize - stripe_off;
324 /* issue this piece on stripe `stripe' */
325 issue_blks = MIN(stripe_rest, num_blks);
326 nestbuf = getpbuf(NULL);
327 nestbuf->b_flags |= bio->bio_buf->b_flags & B_HASBOGUS;
329 nestiobuf_add(bio, nestbuf, blkoff,
330 issue_blks * DEV_BSIZE, NULL);
332 nbio = get_stripe_bio(&nestbuf->b_bio1, tsc);
333 nbio->bio_offset = blknr * tsc->stripe_chunksize;
334 nbio->bio_offset += stripe_off;
335 nbio->bio_offset += dev->offset;
336 nbio->bio_offset *= DEV_BSIZE;
338 vn_strategy(dev->pdev->pdev_vnode, nbio);
341 blkoff += issue_blks * DEV_BSIZE;
342 num_blks -= issue_blks;
344 nestiobuf_start(bio);
348 for (devnr = 0; devnr < tsc->stripe_num; ++devnr) {
349 dev = &tsc->stripe_devs[devnr];
350 nestbuf = getpbuf(NULL);
351 nestbuf->b_flags |= bio->bio_buf->b_flags & B_HASBOGUS;
353 nestiobuf_add(bio, nestbuf, 0, 0, NULL);
355 nbio = get_stripe_bio(&nestbuf->b_bio1, tsc);
356 nbio->bio_offset = 0;
358 vn_strategy(dev->pdev->pdev_vnode, nbio);
360 nestiobuf_start(bio);
363 bp->b_flags |= B_ERROR;
373 dm_target_stripe_dump(dm_table_entry_t *table_en, void *data, size_t length, off_t offset)
375 dm_target_stripe_config_t *tsc;
376 uint64_t blkno, blkoff;
377 uint64_t stripe, blknr;
378 uint32_t stripe_off, stripe_rest, num_blks, issue_blks;
382 tsc = table_en->target_config;
386 /* calculate extent of request */
387 KKASSERT(length % DEV_BSIZE == 0);
389 blkno = offset / DEV_BSIZE;
391 num_blks = length / DEV_BSIZE;
394 * 0 length means flush buffers and return
397 for (devnr = 0; devnr < tsc->stripe_num; ++devnr) {
398 if (tsc->stripe_devs[devnr].pdev->pdev_vnode->v_rdev == NULL)
401 dev_ddump(tsc->stripe_devs[devnr].pdev->pdev_vnode->v_rdev,
407 while (num_blks > 0) {
408 /* blockno to stripe piece nr */
409 stripe = blkno / tsc->stripe_chunksize;
410 stripe_off = blkno % tsc->stripe_chunksize;
412 /* where we are inside the stripe */
413 devnr = stripe % tsc->stripe_num;
414 blknr = stripe / tsc->stripe_num;
416 /* how much is left before we hit a boundary */
417 stripe_rest = tsc->stripe_chunksize - stripe_off;
419 /* issue this piece on stripe `stripe' */
420 issue_blks = MIN(stripe_rest, num_blks);
423 nestiobuf_add(bio, nestbuf, blkoff,
424 issue_blks * DEV_BSIZE);
426 len2 = issue_blks * DEV_BSIZE;
428 /* I need number of bytes. */
429 off2 = blknr * tsc->stripe_chunksize + stripe_off;
430 off2 += tsc->stripe_devs[devnr].offset;
432 off2 = dm_pdev_correct_dump_offset(tsc->stripe_devs[devnr].pdev,
435 if (tsc->stripe_devs[devnr].pdev->pdev_vnode->v_rdev == NULL)
438 dev_ddump(tsc->stripe_devs[devnr].pdev->pdev_vnode->v_rdev,
439 (char *)data + blkoff, 0, off2, len2);
442 blkoff += issue_blks * DEV_BSIZE;
443 num_blks -= issue_blks;
450 * Destroy a dm table entry for stripes.
453 dm_target_stripe_destroy(dm_table_entry_t *table_en)
455 if (table_en->target_config != NULL)
456 dm_target_stripe_destroy_config(table_en->target_config);
462 dm_target_stripe_destroy_config(dm_target_stripe_config_t *tsc)
466 for (n = 0; n < tsc->stripe_num; ++n) {
467 if (tsc->stripe_devs[n].pdev) {
468 dm_pdev_decr(tsc->stripe_devs[n].pdev);
469 tsc->stripe_devs[n].pdev = NULL;
472 kfree(tsc, M_DMSTRIPE);
476 dmts_mod_handler(module_t mod, int type, void *unused)
478 dm_target_t *dmt = NULL;
483 if ((dmt = dm_target_lookup("striped")) != NULL) {
484 dm_target_unbusy(dmt);
487 dmt = dm_target_alloc("striped");
491 dmt->init = &dm_target_stripe_init;
492 dmt->destroy = &dm_target_stripe_destroy;
493 dmt->strategy = &dm_target_stripe_strategy;
494 dmt->table = &dm_target_stripe_table;
495 dmt->info = &dm_target_stripe_info;
496 dmt->dump = &dm_target_stripe_dump;
497 dmt->max_argc = 2 + (MAX_STRIPES * 2);
499 err = dm_target_insert(dmt);
501 kprintf("dm_target_striped: Successfully initialized\n");
505 err = dm_target_remove("striped");
507 kprintf("dm_target_striped: unloaded\n");
514 DM_TARGET_MODULE(dm_target_striped, dmts_mod_handler);