lvm/dm - clean up debug, fix open bug
[dragonfly.git] / sys / dev / disk / dm / device-mapper.c
... / ...
CommitLineData
1/* $NetBSD: device-mapper.c,v 1.22 2010/03/26 15:46:04 jakllsch Exp $ */
2
3/*
4 * Copyright (c) 2010 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 * I want to say thank you to all people who helped me with this project.
34 */
35
36#include <sys/types.h>
37#include <sys/param.h>
38
39#include <sys/buf.h>
40#include <sys/conf.h>
41#include <sys/device.h>
42#include <sys/disk.h>
43#include <sys/disklabel.h>
44#include <sys/dtype.h>
45#include <sys/ioccom.h>
46#include <sys/malloc.h>
47#include <sys/module.h>
48#include <sys/sysctl.h>
49
50#include "netbsd-dm.h"
51#include "dm.h"
52
53static d_ioctl_t dmioctl;
54static d_open_t dmopen;
55static d_close_t dmclose;
56static d_psize_t dmsize;
57static d_strategy_t dmstrategy;
58
59/* attach and detach routines */
60void dmattach(int);
61static int dm_modcmd(module_t mod, int cmd, void *unused);
62static int dmdestroy(void);
63
64static void dm_doinit(void);
65
66static int dm_cmd_to_fun(prop_dictionary_t);
67static int disk_ioctl_switch(cdev_t, u_long, void *);
68static int dm_ioctl_switch(u_long);
69#if 0
70static void dmminphys(struct buf *);
71#endif
72
73/* ***Variable-definitions*** */
74struct dev_ops dm_ops = {
75 { "dm", 0, D_DISK |
76 D_MPSAFE_READ | D_MPSAFE_WRITE | D_MPSAFE_IOCTL },
77 .d_open = dmopen,
78 .d_close = dmclose,
79 .d_read = physread,
80 .d_write = physwrite,
81 .d_ioctl = dmioctl,
82 .d_strategy = dmstrategy,
83 .d_psize = dmsize,
84/* D_DISK */
85};
86
87MALLOC_DEFINE(M_DM, "dm", "Device Mapper allocations");
88
89int dm_debug_level = 0;
90
91extern uint64_t dm_dev_counter;
92
93static cdev_t dmcdev;
94
95static moduledata_t dm_mod = {
96 "dm",
97 dm_modcmd,
98 NULL
99};
100DECLARE_MODULE(dm, dm_mod, SI_SUB_RAID, SI_ORDER_ANY);
101
102/*
103 * This array is used to translate cmd to function pointer.
104 *
105 * Interface between libdevmapper and lvm2tools uses different
106 * names for one IOCTL call because libdevmapper do another thing
107 * then. When I run "info" or "mknodes" libdevmapper will send same
108 * ioctl to kernel but will do another things in userspace.
109 *
110 */
111struct cmd_function cmd_fn[] = {
112 { .cmd = "version", .fn = dm_get_version_ioctl},
113 { .cmd = "targets", .fn = dm_list_versions_ioctl},
114 { .cmd = "create", .fn = dm_dev_create_ioctl},
115 { .cmd = "info", .fn = dm_dev_status_ioctl},
116 { .cmd = "mknodes", .fn = dm_dev_status_ioctl},
117 { .cmd = "names", .fn = dm_dev_list_ioctl},
118 { .cmd = "suspend", .fn = dm_dev_suspend_ioctl},
119 { .cmd = "remove", .fn = dm_dev_remove_ioctl},
120 { .cmd = "rename", .fn = dm_dev_rename_ioctl},
121 { .cmd = "resume", .fn = dm_dev_resume_ioctl},
122 { .cmd = "clear", .fn = dm_table_clear_ioctl},
123 { .cmd = "deps", .fn = dm_table_deps_ioctl},
124 { .cmd = "reload", .fn = dm_table_load_ioctl},
125 { .cmd = "status", .fn = dm_table_status_ioctl},
126 { .cmd = "table", .fn = dm_table_status_ioctl},
127 {NULL, NULL}
128};
129
130/* New module handle routine */
131static int
132dm_modcmd(module_t mod, int cmd, void *unused)
133{
134 int error, bmajor, cmajor;
135
136 error = 0;
137 bmajor = -1;
138 cmajor = -1;
139
140 switch (cmd) {
141 case MOD_LOAD:
142 dm_doinit();
143 kprintf("Device Mapper version %d.%d.%d loaded\n",
144 DM_VERSION_MAJOR, DM_VERSION_MINOR, DM_VERSION_PATCHLEVEL);
145 break;
146
147 case MOD_UNLOAD:
148 /*
149 * Disable unloading of dm module if there are any devices
150 * defined in driver. This is probably too strong we need
151 * to disable auto-unload only if there is mounted dm device
152 * present.
153 */
154 if (dm_dev_counter > 0)
155 return EBUSY;
156
157 error = dmdestroy();
158 if (error)
159 break;
160 kprintf("Device Mapper unloaded\n");
161 break;
162
163 default:
164 break;
165 }
166
167 return error;
168}
169
170/*
171 * dm_detach:
172 *
173 * Autoconfiguration detach function for pseudo-device glue.
174 * This routine is called by dm_ioctl::dm_dev_remove_ioctl and by autoconf to
175 * remove devices created in device-mapper.
176 */
177int
178dm_detach(dm_dev_t *dmv)
179{
180 disable_dev(dmv);
181
182 /* Destroy active table first. */
183 dm_table_destroy(&dmv->table_head, DM_TABLE_ACTIVE);
184
185 /* Destroy inactive table if exits, too. */
186 dm_table_destroy(&dmv->table_head, DM_TABLE_INACTIVE);
187
188 dm_table_head_destroy(&dmv->table_head);
189
190 destroy_dev(dmv->devt);
191
192 /* Destroy device */
193 (void)dm_dev_free(dmv);
194
195 /* Decrement device counter After removing device */
196 --dm_dev_counter; /* XXX: was atomic 64 */
197
198 return 0;
199}
200
201static void
202dm_doinit(void)
203{
204 dm_target_init();
205 dm_dev_init();
206 dm_pdev_init();
207 dmcdev = make_dev(&dm_ops, 0, UID_ROOT, GID_OPERATOR, 0640, "mapper/control");
208}
209
210/* Destroy routine */
211static int
212dmdestroy(void)
213{
214 destroy_dev(dmcdev);
215
216 dm_dev_destroy();
217 dm_pdev_destroy();
218 dm_target_destroy();
219
220 return 0;
221}
222
223static int
224dmopen(struct dev_open_args *ap)
225{
226
227 aprint_debug("dm open routine called %" PRIu32 "\n",
228 minor(ap->a_head.a_dev));
229 return 0;
230}
231
232static int
233dmclose(struct dev_close_args *ap)
234{
235
236 aprint_debug("dm close routine called %" PRIu32 "\n",
237 minor(ap->a_head.a_dev));
238 return 0;
239}
240
241
242static int
243dmioctl(struct dev_ioctl_args *ap)
244{
245 cdev_t dev = ap->a_head.a_dev;
246 u_long cmd = ap->a_cmd;
247 void *data = ap->a_data;
248
249 int r;
250 prop_dictionary_t dm_dict_in;
251
252 r = 0;
253
254 aprint_debug("dmioctl called\n");
255
256 KKASSERT(data != NULL);
257
258 if (( r = disk_ioctl_switch(dev, cmd, data)) == ENOTTY) {
259 struct plistref *pref = (struct plistref *) data;
260
261 /* Check if we were called with NETBSD_DM_IOCTL ioctl
262 otherwise quit. */
263 if ((r = dm_ioctl_switch(cmd)) != 0)
264 return r;
265
266 if((r = prop_dictionary_copyin_ioctl(pref, cmd, &dm_dict_in)) != 0)
267 return r;
268
269 if ((r = dm_check_version(dm_dict_in)) != 0)
270 goto cleanup_exit;
271
272 /* run ioctl routine */
273 if ((r = dm_cmd_to_fun(dm_dict_in)) != 0)
274 goto cleanup_exit;
275
276cleanup_exit:
277 r = prop_dictionary_copyout_ioctl(pref, cmd, dm_dict_in);
278 prop_object_release(dm_dict_in);
279 }
280
281 return r;
282}
283
284/*
285 * Translate command sent from libdevmapper to func.
286 */
287static int
288dm_cmd_to_fun(prop_dictionary_t dm_dict){
289 int i, r;
290 prop_string_t command;
291
292 r = 0;
293
294 if ((command = prop_dictionary_get(dm_dict, DM_IOCTL_COMMAND)) == NULL)
295 return EINVAL;
296
297 for(i = 0; cmd_fn[i].cmd != NULL; i++)
298 if (prop_string_equals_cstring(command, cmd_fn[i].cmd))
299 break;
300
301 if (cmd_fn[i].cmd == NULL)
302 return EINVAL;
303
304 aprint_debug("ioctl %s called\n", cmd_fn[i].cmd);
305 r = cmd_fn[i].fn(dm_dict);
306
307 return r;
308}
309
310/* Call apropriate ioctl handler function. */
311static int
312dm_ioctl_switch(u_long cmd)
313{
314
315 switch(cmd) {
316
317 case NETBSD_DM_IOCTL:
318 aprint_debug("dm NetBSD_DM_IOCTL called\n");
319 break;
320 default:
321 aprint_debug("dm unknown ioctl called\n");
322 return ENOTTY;
323 break; /* NOT REACHED */
324 }
325
326 return 0;
327}
328
329 /*
330 * Check for disk specific ioctls.
331 */
332
333static int
334disk_ioctl_switch(cdev_t dev, u_long cmd, void *data)
335{
336 dm_dev_t *dmv;
337
338 /* disk ioctls make sense only on block devices */
339 if (minor(dev) == 0)
340 return ENOTTY;
341
342 switch(cmd) {
343 case DIOCGPART:
344 {
345 struct partinfo *dpart;
346 u_int64_t size;
347 dpart = (void *)data;
348 bzero(dpart, sizeof(*dpart));
349
350 if ((dmv = dm_dev_lookup(NULL, NULL, minor(dev))) == NULL)
351 return ENODEV;
352 if (dmv->diskp->d_info.d_media_blksize == 0) {
353 dm_dev_unbusy(dmv);
354 return ENOTSUP;
355 } else {
356 size = dm_table_size(&dmv->table_head);
357 dpart->media_offset = 0;
358 dpart->media_size = size * DEV_BSIZE;
359 dpart->media_blocks = size;
360 dpart->media_blksize = DEV_BSIZE;
361 dpart->fstype = FS_BSDFFS;
362 }
363 dm_dev_unbusy(dmv);
364 break;
365 }
366
367 default:
368 aprint_debug("unknown disk_ioctl called\n");
369 return ENOTTY;
370 break; /* NOT REACHED */
371 }
372
373 return 0;
374}
375
376/*
377 * Do all IO operations on dm logical devices.
378 */
379static int
380dmstrategy(struct dev_strategy_args *ap)
381{
382 cdev_t dev = ap->a_head.a_dev;
383 struct bio *bio = ap->a_bio;
384 struct buf *bp = bio->bio_buf;
385
386 dm_dev_t *dmv;
387 dm_table_t *tbl;
388 dm_table_entry_t *table_en;
389 struct buf *nestbuf;
390
391 uint32_t dev_type;
392
393 uint64_t buf_start, buf_len, issued_len;
394 uint64_t table_start, table_end;
395 uint64_t start, end;
396
397 buf_start = bio->bio_offset;
398 buf_len = bp->b_bcount;
399
400 tbl = NULL;
401
402 table_end = 0;
403 dev_type = 0;
404 issued_len = 0;
405
406 if ((dmv = dm_dev_lookup(NULL, NULL, minor(dev))) == NULL) {
407 bp->b_error = EIO;
408 bp->b_resid = bp->b_bcount;
409 biodone(bio);
410 return 0;
411 }
412
413 if (bounds_check_with_mediasize(bio, DEV_BSIZE,
414 dm_table_size(&dmv->table_head)) <= 0) {
415 dm_dev_unbusy(dmv);
416 bp->b_resid = bp->b_bcount;
417 biodone(bio);
418 return 0;
419 }
420
421 /* Select active table */
422 tbl = dm_table_get_entry(&dmv->table_head, DM_TABLE_ACTIVE);
423
424 /* Nested buffers count down to zero therefore I have
425 to set bp->b_resid to maximal value. */
426 bp->b_resid = bp->b_bcount;
427
428 /*
429 * Find out what tables I want to select.
430 */
431 SLIST_FOREACH(table_en, tbl, next)
432 {
433 /* I need need number of bytes not blocks. */
434 table_start = table_en->start * DEV_BSIZE;
435 /*
436 * I have to sub 1 from table_en->length to prevent
437 * off by one error
438 */
439 table_end = table_start + (table_en->length)* DEV_BSIZE;
440
441 start = MAX(table_start, buf_start);
442
443 end = MIN(table_end, buf_start + buf_len);
444
445 aprint_debug("----------------------------------------\n");
446 aprint_debug("table_start %010" PRIu64", table_end %010"
447 PRIu64 "\n", table_start, table_end);
448 aprint_debug("buf_start %010" PRIu64", buf_len %010"
449 PRIu64"\n", buf_start, buf_len);
450 aprint_debug("start-buf_start %010"PRIu64", end %010"
451 PRIu64"\n", start - buf_start, end);
452 aprint_debug("start %010" PRIu64" , end %010"
453 PRIu64"\n", start, end);
454 aprint_debug("\n----------------------------------------\n");
455
456 if (start < end) {
457 /* create nested buffer */
458 nestbuf = getpbuf(NULL);
459
460 nestiobuf_setup(bio, nestbuf, start - buf_start,
461 (end - start));
462
463 issued_len += end - start;
464
465 /* I need number of bytes. */
466 nestbuf->b_bio1.bio_offset = (start - table_start);
467
468 table_en->target->strategy(table_en, nestbuf);
469 }
470 }
471
472 if (issued_len < buf_len)
473 nestiobuf_done(bio, buf_len - issued_len, EINVAL);
474
475 dm_table_release(&dmv->table_head, DM_TABLE_ACTIVE);
476 dm_dev_unbusy(dmv);
477
478 return 0;
479}
480
481static int
482dmsize(struct dev_psize_args *ap)
483{
484 cdev_t dev = ap->a_head.a_dev;
485 dm_dev_t *dmv;
486 uint64_t size;
487
488 size = 0;
489
490 if ((dmv = dm_dev_lookup(NULL, NULL, minor(dev))) == NULL)
491 return -ENOENT;
492
493 size = dm_table_size(&dmv->table_head);
494 dm_dev_unbusy(dmv);
495
496 return size;
497}
498
499#if 0
500static void
501dmminphys(struct buf *bp)
502{
503
504 bp->b_bcount = MIN(bp->b_bcount, MAXPHYS);
505}
506#endif
507
508void
509dmsetdiskinfo(struct disk *disk, dm_table_head_t *head)
510{
511 struct disk_info info;
512 int dmp_size;
513
514 dmp_size = dm_table_size(head);
515
516 bzero(&info, sizeof(struct disk_info));
517 info.d_media_blksize = DEV_BSIZE;
518 info.d_media_blocks = dmp_size;
519 info.d_media_size = dmp_size * DEV_BSIZE;
520 info.d_dsflags = DSO_MBRQUIET; /* XXX */
521 info.d_secpertrack = 32;
522 info.d_nheads = 64;
523 info.d_secpercyl = info.d_secpertrack * info.d_nheads;
524 info.d_ncylinders = dmp_size / 2048;
525 bcopy(&info, &disk->d_info, sizeof(disk->d_info));
526}
527
528prop_dictionary_t
529dmgetdiskinfo(struct disk *disk)
530{
531 prop_dictionary_t disk_info, geom;
532 struct disk_info *pinfo;
533
534 pinfo = &disk->d_info;
535
536 disk_info = prop_dictionary_create();
537 geom = prop_dictionary_create();
538
539 prop_dictionary_set_cstring_nocopy(disk_info, "type", "ESDI");
540 prop_dictionary_set_uint64(geom, "sectors-per-unit", pinfo->d_media_blocks);
541 prop_dictionary_set_uint32(geom, "sector-size",
542 DEV_BSIZE /* XXX 512? */);
543 prop_dictionary_set_uint32(geom, "sectors-per-track", 32);
544 prop_dictionary_set_uint32(geom, "tracks-per-cylinder", 64);
545 prop_dictionary_set_uint32(geom, "cylinders-per-unit",
546 pinfo->d_media_blocks / 2048);
547 prop_dictionary_set(disk_info, "geometry", geom);
548 prop_object_release(geom);
549
550 return disk_info;
551}
552
553void
554dmgetproperties(struct disk *disk, dm_table_head_t *head)
555{
556#if 0
557 prop_dictionary_t disk_info, odisk_info, geom;
558 int dmp_size;
559
560 dmp_size = dm_table_size(head);
561 disk_info = prop_dictionary_create();
562 geom = prop_dictionary_create();
563
564 prop_dictionary_set_cstring_nocopy(disk_info, "type", "ESDI");
565 prop_dictionary_set_uint64(geom, "sectors-per-unit", dmp_size);
566 prop_dictionary_set_uint32(geom, "sector-size",
567 DEV_BSIZE /* XXX 512? */);
568 prop_dictionary_set_uint32(geom, "sectors-per-track", 32);
569 prop_dictionary_set_uint32(geom, "tracks-per-cylinder", 64);
570 prop_dictionary_set_uint32(geom, "cylinders-per-unit", dmp_size / 2048);
571 prop_dictionary_set(disk_info, "geometry", geom);
572 prop_object_release(geom);
573
574 odisk_info = disk->dk_info;
575 disk->dk_info = disk_info;
576
577 if (odisk_info != NULL)
578 prop_object_release(odisk_info);
579#endif
580}
581
582TUNABLE_INT("debug.dm_debug", &dm_debug_level);
583SYSCTL_INT(_debug, OID_AUTO, dm_debug, CTLFLAG_RW, &dm_debug_level,
584 0, "Eanble device mapper debugging");
585