2 * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
3 * Copyright (c) 2012 Andrey V. Elsukov <ae@FreeBSD.org>
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 #include <sys/cdefs.h>
29 __FBSDID("$FreeBSD$");
32 #include <sys/queue.h>
35 #include <bootstrap.h>
41 # define DEBUG(fmt, args...) printf("%s: " fmt "\n" , __func__ , ## args)
43 # define DEBUG(fmt, args...)
55 struct disk_devdesc *dev;
61 const struct devsw *d_dev;
68 STAILQ_ENTRY(dentry) entry;
74 static STAILQ_HEAD(, dentry) opened_disks =
75 STAILQ_HEAD_INITIALIZER(opened_disks);
78 disk_lookup(struct disk_devdesc *dev)
84 STAILQ_FOREACH(entry, &opened_disks, entry) {
85 if (entry->d_dev != dev->d_dev ||
86 entry->d_unit != dev->d_unit)
88 dev->d_opendata = entry->od;
89 if (entry->d_slice == dev->d_slice &&
90 entry->d_partition == dev->d_partition) {
91 dev->d_offset = entry->d_offset;
92 DEBUG("%s offset %lld", disk_fmtdev(dev),
93 (long long)dev->d_offset);
105 disk_insert(struct disk_devdesc *dev)
107 struct dentry *entry;
109 entry = (struct dentry *)malloc(sizeof(struct dentry));
114 entry->d_dev = dev->d_dev;
115 entry->d_unit = dev->d_unit;
116 entry->d_slice = dev->d_slice;
117 entry->d_partition = dev->d_partition;
118 entry->od = (struct open_disk *)dev->d_opendata;
120 entry->d_offset = dev->d_offset;
124 STAILQ_INSERT_TAIL(&opened_disks, entry, entry);
125 DEBUG("%s cached", disk_fmtdev(dev));
129 COMMAND_SET(dcachestat, "dcachestat", "get disk cache stats",
133 command_dcachestat(int argc, char *argv[])
135 struct disk_devdesc dev;
136 struct dentry *entry;
138 STAILQ_FOREACH(entry, &opened_disks, entry) {
139 dev.d_dev = (struct devsw *)entry->d_dev;
140 dev.d_unit = entry->d_unit;
141 dev.d_slice = entry->d_slice;
142 dev.d_partition = entry->d_partition;
143 printf("%s %d => %p [%d]\n", disk_fmtdev(&dev), entry->count,
144 entry->od, entry->od->rcnt);
148 #endif /* DISK_DEBUG */
150 /* Convert size to a human-readable number. */
152 display_size(uint64_t size, u_int sectorsize)
157 size = size * sectorsize / 1024;
159 if (size >= 10485760000LL) {
162 } else if (size >= 10240000) {
165 } else if (size >= 10000) {
169 sprintf(buf, "%ld%cB", (long)size, unit);
174 ptblread(void *d, void *buf, size_t blocks, off_t offset)
176 struct disk_devdesc *dev;
177 struct open_disk *od;
179 dev = (struct disk_devdesc *)d;
180 od = (struct open_disk *)dev->d_opendata;
181 return (dev->d_dev->dv_strategy(dev, F_READ, offset,
182 blocks * od->sectorsize, (char *)buf, NULL));
187 ptable_print(void *arg, const char *pname, const struct ptable_entry *part)
189 struct print_args *pa, bsd;
190 struct open_disk *od;
191 struct ptable *table;
194 pa = (struct print_args *)arg;
195 od = (struct open_disk *)pa->dev->d_opendata;
196 sprintf(line, " %s%s: %s", pa->prefix, pname,
197 parttype2str(part->type));
199 sprintf(line, "%-*s%s", PWIDTH, line,
200 display_size(part->end - part->start + 1,
204 if (part->type == PART_FREEBSD) {
205 /* Open slice with BSD label */
206 pa->dev->d_offset = part->start;
207 table = ptable_open(pa->dev, part->end - part->start + 1,
208 od->sectorsize, ptblread);
211 sprintf(line, " %s%s", pa->prefix, pname);
214 bsd.verbose = pa->verbose;
215 ptable_iterate(table, &bsd, ptable_print);
222 disk_print(struct disk_devdesc *dev, char *prefix, int verbose)
224 struct open_disk *od;
225 struct print_args pa;
227 /* Disk should be opened */
228 od = (struct open_disk *)dev->d_opendata;
231 pa.verbose = verbose;
232 ptable_iterate(od->table, &pa, ptable_print);
236 disk_read(struct disk_devdesc *dev, void *buf, off_t offset, u_int blocks)
238 struct open_disk *od;
241 od = (struct open_disk *)dev->d_opendata;
242 ret = dev->d_dev->dv_strategy(dev, F_READ, dev->d_offset + offset,
243 blocks * od->sectorsize, buf, NULL);
249 disk_write(struct disk_devdesc *dev, void *buf, off_t offset, u_int blocks)
251 struct open_disk *od;
254 od = (struct open_disk *)dev->d_opendata;
255 ret = dev->d_dev->dv_strategy(dev, F_WRITE, dev->d_offset + offset,
256 blocks * od->sectorsize, buf, NULL);
262 disk_ioctl(struct disk_devdesc *dev, u_long cmd, void *buf)
265 if (dev->d_dev->dv_ioctl)
266 return ((*dev->d_dev->dv_ioctl)(dev->d_opendata, cmd, buf));
272 disk_open(struct disk_devdesc *dev, off_t mediasize, u_int sectorsize,
275 struct open_disk *od;
276 struct ptable *table;
277 struct ptable_entry part;
278 int rc, slice, partition;
281 if ((flags & DISK_F_NOCACHE) == 0) {
282 rc = disk_lookup(dev);
287 * While we are reading disk metadata, make sure we do it relative
288 * to the start of the disk
292 slice = dev->d_slice;
293 partition = dev->d_partition;
296 * This entire disk was already opened and there is no
297 * need to allocate new open_disk structure and open the
298 * main partition table.
300 od = (struct open_disk *)dev->d_opendata;
301 DEBUG("%s unit %d, slice %d, partition %d => %p (cached)",
302 disk_fmtdev(dev), dev->d_unit, dev->d_slice,
303 dev->d_partition, od);
306 od = (struct open_disk *)malloc(sizeof(struct open_disk));
311 dev->d_opendata = od;
314 od->mediasize = mediasize;
315 od->sectorsize = sectorsize;
317 DEBUG("%s unit %d, slice %d, partition %d => %p",
318 disk_fmtdev(dev), dev->d_unit, dev->d_slice, dev->d_partition, od);
320 /* Determine disk layout. */
321 od->table = ptable_open(dev, mediasize / sectorsize, sectorsize,
323 if (od->table == NULL) {
324 DEBUG("Can't read partition table");
330 if (ptable_gettype(od->table) == PTABLE_BSD &&
332 /* It doesn't matter what value has d_slice */
333 rc = ptable_getpart(od->table, &part, partition);
335 dev->d_offset = part.start;
336 } else if (slice >= 0) {
337 /* Try to get information about partition */
339 rc = ptable_getbestpart(od->table, &part);
341 rc = ptable_getpart(od->table, &part, slice);
342 if (rc != 0) /* Partition doesn't exist */
344 dev->d_offset = part.start;
346 if (ptable_gettype(od->table) == PTABLE_GPT) {
348 goto out; /* Nothing more to do */
349 } else if (partition == 255) {
351 * When we try to open GPT partition, but partition
352 * table isn't GPT, reset d_partition value to -1
353 * and try to autodetect appropriate value.
358 * If d_partition < 0 and we are looking at a BSD slice,
359 * then try to read BSD label, otherwise return the
362 if (partition == -1 &&
363 part.type != PART_FREEBSD)
365 /* Try to read BSD label */
366 table = ptable_open(dev, part.end - part.start + 1,
367 od->sectorsize, ptblread);
369 DEBUG("Can't read BSD label");
374 * If slice contains BSD label and d_partition < 0, then
375 * assume the 'a' partition. Otherwise just return the
376 * whole MBR slice, because it can contain ZFS.
379 if (ptable_gettype(table) != PTABLE_BSD)
383 rc = ptable_getpart(table, &part, partition);
386 dev->d_offset += part.start;
394 if (od->table != NULL)
395 ptable_close(od->table);
398 DEBUG("%s could not open", disk_fmtdev(dev));
400 if ((flags & DISK_F_NOCACHE) == 0)
402 /* Save the slice and partition number to the dev */
403 dev->d_slice = slice;
404 dev->d_partition = partition;
405 DEBUG("%s offset %lld => %p", disk_fmtdev(dev),
406 (long long)dev->d_offset, od);
412 disk_close(struct disk_devdesc *dev)
414 struct open_disk *od;
416 od = (struct open_disk *)dev->d_opendata;
417 DEBUG("%s closed => %p [%d]", disk_fmtdev(dev), od, od->rcnt);
418 if (od->flags & DISK_F_NOCACHE) {
419 ptable_close(od->table);
426 disk_cleanup(const struct devsw *d_dev)
429 struct disk_devdesc dev;
431 struct dentry *entry, *tmp;
433 STAILQ_FOREACH_SAFE(entry, &opened_disks, entry, tmp) {
434 if (entry->d_dev != d_dev)
438 dev.d_dev = (struct devsw *)entry->d_dev;
439 dev.d_unit = entry->d_unit;
440 dev.d_slice = entry->d_slice;
441 dev.d_partition = entry->d_partition;
442 DEBUG("%s was freed => %p [%d]", disk_fmtdev(&dev),
443 entry->od, entry->od->rcnt);
445 STAILQ_REMOVE(&opened_disks, entry, dentry, entry);
446 if (entry->od->rcnt < 1) {
447 if (entry->od->table != NULL)
448 ptable_close(entry->od->table);
456 disk_fmtdev(struct disk_devdesc *dev)
458 static char buf[128];
461 cp = buf + sprintf(buf, "%s%d", dev->d_dev->dv_name, dev->d_unit);
462 if (dev->d_slice >= 0) {
463 #ifdef LOADER_GPT_SUPPORT
464 if (dev->d_partition == 255) {
465 sprintf(cp, "p%d:", dev->d_slice);
469 #ifdef LOADER_MBR_SUPPORT
470 cp += sprintf(cp, "s%d", dev->d_slice);
473 if (dev->d_partition >= 0)
474 cp += sprintf(cp, "%c", dev->d_partition + 'a');
480 disk_parsedev(struct disk_devdesc *dev, const char *devspec, const char **path)
482 int unit, slice, partition;
487 unit = slice = partition = -1;
488 if (*np != '\0' && *np != ':') {
489 unit = strtol(np, &cp, 10);
492 #ifdef LOADER_GPT_SUPPORT
495 slice = strtol(np, &cp, 10);
498 /* we don't support nested partitions on GPT */
499 if (*cp != '\0' && *cp != ':')
504 #ifdef LOADER_MBR_SUPPORT
507 slice = strtol(np, &cp, 10);
512 if (*cp != '\0' && *cp != ':') {
513 partition = *cp - 'a';
521 if (*cp != '\0' && *cp != ':')
524 dev->d_slice = slice;
525 dev->d_partition = partition;
527 *path = (*cp == '\0') ? cp: cp + 1;