2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2005 Ivan Voras <ivoras@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 AUTHORS 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 AUTHORS 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("$FreeBSD$");
31 #include <sys/param.h>
45 #include <core/geom.h>
46 #include <misc/subr.h>
48 #include <geom/virstor/g_virstor_md.h>
49 #include <geom/virstor/g_virstor.h>
51 uint32_t lib_version = G_LIB_VERSION;
52 uint32_t version = G_VIRSTOR_VERSION;
54 #define GVIRSTOR_CHUNK_SIZE "4M"
55 #define GVIRSTOR_VIR_SIZE "2T"
57 #if G_LIB_VERSION == 1
58 /* Support RELENG_6 */
59 #define G_TYPE_BOOL G_TYPE_NONE
63 * virstor_main gets called by the geom(8) utility
65 static void virstor_main(struct gctl_req *req, unsigned flags);
67 struct g_command class_commands[] = {
68 { "clear", G_FLAG_VERBOSE, virstor_main, G_NULL_OPTS,
71 { "dump", 0, virstor_main, G_NULL_OPTS,
74 { "label", G_FLAG_VERBOSE | G_FLAG_LOADKLD, virstor_main,
76 { 'h', "hardcode", NULL, G_TYPE_BOOL},
77 { 'm', "chunk_size", GVIRSTOR_CHUNK_SIZE, G_TYPE_NUMBER},
78 { 's', "vir_size", GVIRSTOR_VIR_SIZE, G_TYPE_NUMBER},
81 "[-h] [-v] [-m chunk_size] [-s vir_size] name provider0 [provider1 ...]"
83 { "destroy", G_FLAG_VERBOSE, NULL,
85 { 'f', "force", NULL, G_TYPE_BOOL},
90 { "stop", G_FLAG_VERBOSE, NULL,
92 { 'f', "force", NULL, G_TYPE_BOOL},
95 "[-fv] name ... (alias for \"destroy\")"
97 { "add", G_FLAG_VERBOSE, NULL,
99 { 'h', "hardcode", NULL, G_TYPE_BOOL},
102 "[-vh] name prov [prov ...]"
104 { "remove", G_FLAG_VERBOSE, NULL, G_NULL_OPTS,
110 static int verbose = 0;
112 /* Helper functions' declarations */
113 static void virstor_clear(struct gctl_req *req);
114 static void virstor_dump(struct gctl_req *req);
115 static void virstor_label(struct gctl_req *req);
117 /* Dispatcher function (no real work done here, only verbose flag recorder) */
119 virstor_main(struct gctl_req *req, unsigned flags)
123 if ((flags & G_FLAG_VERBOSE) != 0)
126 name = gctl_get_ascii(req, "verb");
128 gctl_error(req, "No '%s' argument.", "verb");
131 if (strcmp(name, "label") == 0)
133 else if (strcmp(name, "clear") == 0)
135 else if (strcmp(name, "dump") == 0)
138 gctl_error(req, "%s: Unknown command: %s.", __func__, name);
140 /* No CTASSERT in userland
141 CTASSERT(VIRSTOR_MAP_BLOCK_ENTRIES*VIRSTOR_MAP_ENTRY_SIZE == MAXPHYS);
146 * Labels a new geom Meaning: parses and checks the parameters, calculates &
147 * writes metadata to the relevant providers so when the next round of
148 * "tasting" comes (which will be just after the provider(s) are closed) geom
149 * can be instantiated with the tasted metadata.
152 virstor_label(struct gctl_req *req)
154 struct g_virstor_metadata md;
158 size_t ssize, secsize;
161 int hardcode, nargs, error;
162 struct virstor_map_entry *map;
163 size_t total_chunks; /* We'll run out of memory if
164 this needs to be bigger. */
165 unsigned int map_chunks; /* Chunks needed by the map (map size). */
166 size_t map_size; /* In bytes. */
170 nargs = gctl_get_int(req, "nargs");
172 gctl_error(req, "Too few arguments (%d): expecting: name "
173 "provider0 [provider1 ...]", nargs);
177 hardcode = gctl_get_int(req, "hardcode");
180 * Initialize constant parts of metadata: magic signature, version,
183 bzero(&md, sizeof(md));
184 strlcpy(md.md_magic, G_VIRSTOR_MAGIC, sizeof(md.md_magic));
185 md.md_version = G_VIRSTOR_VERSION;
186 name = gctl_get_ascii(req, "arg0");
188 gctl_error(req, "No 'arg%u' argument.", 0);
191 strlcpy(md.md_name, name, sizeof(md.md_name));
193 md.md_virsize = (off_t)gctl_get_intmax(req, "vir_size");
194 md.md_chunk_size = gctl_get_intmax(req, "chunk_size");
195 md.md_count = nargs - 1;
197 if (md.md_virsize == 0 || md.md_chunk_size == 0) {
198 gctl_error(req, "Virtual size and chunk size must be non-zero");
202 if (md.md_chunk_size % MAXPHYS != 0) {
203 /* XXX: This is not strictly needed, but it's convenient to
204 * impose some limitations on it, so why not MAXPHYS. */
205 size_t new_size = rounddown(md.md_chunk_size, MAXPHYS);
206 if (new_size < md.md_chunk_size)
208 fprintf(stderr, "Resizing chunk size to be a multiple of "
209 "MAXPHYS (%d kB).\n", MAXPHYS / 1024);
210 fprintf(stderr, "New chunk size: %zu kB\n", new_size / 1024);
211 md.md_chunk_size = new_size;
214 if (md.md_virsize % md.md_chunk_size != 0) {
215 off_t chunk_count = md.md_virsize / md.md_chunk_size;
216 md.md_virsize = chunk_count * md.md_chunk_size;
217 fprintf(stderr, "Resizing virtual size to be a multiple of "
219 fprintf(stderr, "New virtual size: %zu MB\n",
220 (size_t)(md.md_virsize/(1024 * 1024)));
224 for (i = 1; i < (unsigned)nargs; i++) {
225 snprintf(param, sizeof(param), "arg%u", i);
226 name = gctl_get_ascii(req, "%s", param);
227 ssize = g_get_sectorsize(name);
229 fprintf(stderr, "%s for %s\n", strerror(errno), name);
230 msize += g_get_mediasize(name);
233 else if (secsize != ssize) {
234 gctl_error(req, "Devices need to have same sector size "
235 "(%u on %s needs to be %u).",
236 (u_int)ssize, name, (u_int)secsize);
242 gctl_error(req, "Device not specified");
246 if (md.md_chunk_size % secsize != 0) {
247 fprintf(stderr, "Error: chunk size is not a multiple of sector "
249 gctl_error(req, "Chunk size (in bytes) must be multiple of %u.",
250 (unsigned int)secsize);
254 total_chunks = md.md_virsize / md.md_chunk_size;
255 map_size = total_chunks * sizeof(*map);
256 assert(md.md_virsize % md.md_chunk_size == 0);
258 ssize = map_size % secsize;
260 size_t add_chunks = (secsize - ssize) / sizeof(*map);
261 total_chunks += add_chunks;
262 md.md_virsize = (off_t)total_chunks * (off_t)md.md_chunk_size;
263 map_size = total_chunks * sizeof(*map);
264 fprintf(stderr, "Resizing virtual size to fit virstor "
266 fprintf(stderr, "New virtual size: %ju MB (%zu new chunks)\n",
267 (uintmax_t)(md.md_virsize / (1024 * 1024)), add_chunks);
271 printf("Total virtual chunks: %zu (%zu MB each), %ju MB total "
273 total_chunks, (size_t)(md.md_chunk_size / (1024 * 1024)),
274 md.md_virsize/(1024 * 1024));
276 if ((off_t)md.md_virsize < msize)
277 fprintf(stderr, "WARNING: Virtual storage size < Physical "
278 "available storage (%ju < %ju)\n", md.md_virsize, msize);
280 /* Clear last sector first to spoil all components if device exists. */
282 printf("Clearing metadata on");
284 for (i = 1; i < (unsigned)nargs; i++) {
285 snprintf(param, sizeof(param), "arg%u", i);
286 name = gctl_get_ascii(req, "%s", param);
291 msize = g_get_mediasize(name);
292 ssize = g_get_sectorsize(name);
293 if (msize == 0 || ssize == 0) {
294 gctl_error(req, "Can't retrieve information about "
295 "%s: %s.", name, strerror(errno));
298 if (msize < (off_t) MAX(md.md_chunk_size*4, map_size))
299 gctl_error(req, "Device %s is too small", name);
300 error = g_metadata_clear(name, NULL);
302 gctl_error(req, "Can't clear metadata on %s: %s.", name,
309 /* Write allocation table to the first provider - this needs to be done
310 * before metadata is written because when kernel tastes it it's too
312 name = gctl_get_ascii(req, "arg1"); /* device with metadata */
314 printf(".\nWriting allocation table to %s...", name);
316 /* How many chunks does the map occupy? */
317 map_chunks = map_size/md.md_chunk_size;
318 if (map_size % md.md_chunk_size != 0)
321 printf(" (%zu MB, %d chunks) ", map_size/(1024*1024), map_chunks);
325 if (strncmp(name, _PATH_DEV, sizeof(_PATH_DEV) - 1) == 0)
326 fd = open(name, O_RDWR);
328 sprintf(param, "%s%s", _PATH_DEV, name);
329 fd = open(param, O_RDWR);
332 gctl_error(req, "Cannot open provider %s to write map", name);
334 /* Do it with calloc because there might be a need to set up chunk flags
336 map = calloc(total_chunks, sizeof(*map));
339 "Out of memory (need %zu bytes for allocation map)",
343 written = pwrite(fd, map, map_size, 0);
345 if ((size_t)written != map_size) {
347 fprintf(stderr, "\nTried to write %zu, written %zd (%s)\n",
348 map_size, written, strerror(errno));
350 gctl_error(req, "Error writing out allocation map!");
356 printf("\nStoring metadata on ");
359 * ID is randomly generated, unique for a geom. This is used to
360 * recognize all providers belonging to one geom.
362 md.md_id = arc4random();
364 /* Ok, store metadata. */
365 for (i = 1; i < (unsigned)nargs; i++) {
366 snprintf(param, sizeof(param), "arg%u", i);
367 name = gctl_get_ascii(req, "%s", param);
369 msize = g_get_mediasize(name);
370 ssize = g_get_sectorsize(name);
375 /* this provider's position/type in geom */
377 /* this provider's size */
379 /* chunk allocation info */
380 md.chunk_count = md.provsize / md.md_chunk_size;
382 printf("(%u chunks) ", md.chunk_count);
383 /* Check to make sure last sector is unused */
384 if ((off_t)(md.chunk_count * md.md_chunk_size) > (off_t)(msize-ssize))
388 md.chunk_reserved = 0;
391 md.chunk_reserved = map_chunks * 2;
392 md.flags = VIRSTOR_PROVIDER_ALLOCATED |
393 VIRSTOR_PROVIDER_CURRENT;
394 md.chunk_next = md.chunk_reserved;
396 printf("(%u reserved) ", md.chunk_reserved);
400 bzero(md.provider, sizeof(md.provider));
402 /* convert "/dev/something" to "something" */
403 if (strncmp(name, _PATH_DEV, sizeof(_PATH_DEV) - 1) == 0) {
404 strlcpy(md.provider, name + sizeof(_PATH_DEV) - 1,
405 sizeof(md.provider));
407 strlcpy(md.provider, name, sizeof(md.provider));
409 sect = malloc(ssize);
411 err(1, "Cannot allocate sector of %zu bytes", ssize);
413 virstor_metadata_encode(&md, sect);
414 error = g_metadata_store(name, sect, ssize);
419 fprintf(stderr, "Can't store metadata on %s: %s.\n",
420 name, strerror(error));
422 "Not fully done (error storing metadata).");
432 /* Clears metadata on given provider(s) IF it's owned by us */
434 virstor_clear(struct gctl_req *req)
442 nargs = gctl_get_int(req, "nargs");
444 gctl_error(req, "Too few arguments.");
447 for (i = 0; i < (unsigned)nargs; i++) {
448 snprintf(param, sizeof(param), "arg%u", i);
449 name = gctl_get_ascii(req, "%s", param);
451 error = g_metadata_clear(name, G_VIRSTOR_MAGIC);
453 fprintf(stderr, "Can't clear metadata on %s: %s "
454 "(do I own it?)\n", name, strerror(error));
456 "Not fully done (can't clear metadata).");
459 if (strncmp(name, _PATH_DEV, sizeof(_PATH_DEV) - 1) == 0)
460 fd = open(name, O_RDWR);
462 sprintf(param, "%s%s", _PATH_DEV, name);
463 fd = open(param, O_RDWR);
466 gctl_error(req, "Cannot clear header sector for %s",
471 printf("Metadata cleared on %s.\n", name);
475 /* Print some metadata information */
477 virstor_metadata_dump(const struct g_virstor_metadata *md)
479 printf(" Magic string: %s\n", md->md_magic);
480 printf(" Metadata version: %u\n", (u_int) md->md_version);
481 printf(" Device name: %s\n", md->md_name);
482 printf(" Device ID: %u\n", (u_int) md->md_id);
483 printf(" Provider index: %u\n", (u_int) md->no);
484 printf(" Active providers: %u\n", (u_int) md->md_count);
485 printf(" Hardcoded provider: %s\n",
486 md->provider[0] != '\0' ? md->provider : "(not hardcoded)");
487 printf(" Virtual size: %u MB\n",
488 (unsigned int)(md->md_virsize/(1024 * 1024)));
489 printf(" Chunk size: %u kB\n", md->md_chunk_size / 1024);
490 printf(" Chunks on provider: %u\n", md->chunk_count);
491 printf(" Chunks free: %u\n", md->chunk_count - md->chunk_next);
492 printf(" Reserved chunks: %u\n", md->chunk_reserved);
495 /* Called by geom(8) via gvirstor_main() to dump metadata information */
497 virstor_dump(struct gctl_req *req)
499 struct g_virstor_metadata md;
500 u_char tmpmd[512]; /* temporary buffer */
505 assert(sizeof(tmpmd) >= sizeof(md));
507 nargs = gctl_get_int(req, "nargs");
509 gctl_error(req, "Too few arguments.");
512 for (i = 0; i < nargs; i++) {
513 snprintf(param, sizeof(param), "arg%u", i);
514 name = gctl_get_ascii(req, "%s", param);
516 error = g_metadata_read(name, (u_char *) & tmpmd, sizeof(tmpmd),
519 fprintf(stderr, "Can't read metadata from %s: %s.\n",
520 name, strerror(error));
522 "Not fully done (error reading metadata).");
525 virstor_metadata_decode((u_char *) & tmpmd, &md);
526 printf("Metadata on %s:\n", name);
527 virstor_metadata_dump(&md);