| Current Path : /usr/src/sbin/geom/class/virstor/ |
FreeBSD hs32.drive.ne.jp 9.1-RELEASE FreeBSD 9.1-RELEASE #1: Wed Jan 14 12:18:08 JST 2015 root@hs32.drive.ne.jp:/sys/amd64/compile/hs32 amd64 |
| Current File : //usr/src/sbin/geom/class/virstor/geom_virstor.c |
/*-
* Copyright (c) 2005 Ivan Voras <ivoras@freebsd.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: release/9.1.0/sbin/geom/class/virstor/geom_virstor.c 215704 2010-11-22 20:10:48Z brucec $");
#include <sys/param.h>
#include <errno.h>
#include <paths.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <strings.h>
#include <fcntl.h>
#include <unistd.h>
#include <libgeom.h>
#include <err.h>
#include <assert.h>
#include <core/geom.h>
#include <misc/subr.h>
#include <geom/virstor/g_virstor_md.h>
#include <geom/virstor/g_virstor.h>
uint32_t lib_version = G_LIB_VERSION;
uint32_t version = G_VIRSTOR_VERSION;
#define GVIRSTOR_CHUNK_SIZE "4M"
#define GVIRSTOR_VIR_SIZE "2T"
#if G_LIB_VERSION == 1
/* Support RELENG_6 */
#define G_TYPE_BOOL G_TYPE_NONE
#endif
/*
* virstor_main gets called by the geom(8) utility
*/
static void virstor_main(struct gctl_req *req, unsigned flags);
struct g_command class_commands[] = {
{ "clear", G_FLAG_VERBOSE, virstor_main, G_NULL_OPTS,
"[-v] prov ..."
},
{ "dump", 0, virstor_main, G_NULL_OPTS,
"prov ..."
},
{ "label", G_FLAG_VERBOSE | G_FLAG_LOADKLD, virstor_main,
{
{ 'h', "hardcode", NULL, G_TYPE_BOOL},
{ 'm', "chunk_size", GVIRSTOR_CHUNK_SIZE, G_TYPE_NUMBER},
{ 's', "vir_size", GVIRSTOR_VIR_SIZE, G_TYPE_NUMBER},
G_OPT_SENTINEL
},
"[-h] [-v] [-m chunk_size] [-s vir_size] name provider0 [provider1 ...]"
},
{ "destroy", G_FLAG_VERBOSE, NULL,
{
{ 'f', "force", NULL, G_TYPE_BOOL},
G_OPT_SENTINEL
},
"[-fv] name ..."
},
{ "stop", G_FLAG_VERBOSE, NULL,
{
{ 'f', "force", NULL, G_TYPE_BOOL},
G_OPT_SENTINEL
},
"[-fv] name ... (alias for \"destroy\")"
},
{ "add", G_FLAG_VERBOSE, NULL,
{
{ 'h', "hardcode", NULL, G_TYPE_BOOL},
G_OPT_SENTINEL
},
"[-vh] name prov [prov ...]"
},
{ "remove", G_FLAG_VERBOSE, NULL, G_NULL_OPTS,
"[-v] name ..."
},
G_CMD_SENTINEL
};
static int verbose = 0;
/* Helper functions' declarations */
static void virstor_clear(struct gctl_req *req);
static void virstor_dump(struct gctl_req *req);
static void virstor_label(struct gctl_req *req);
/* Dispatcher function (no real work done here, only verbose flag recorder) */
static void
virstor_main(struct gctl_req *req, unsigned flags)
{
const char *name;
if ((flags & G_FLAG_VERBOSE) != 0)
verbose = 1;
name = gctl_get_ascii(req, "verb");
if (name == NULL) {
gctl_error(req, "No '%s' argument.", "verb");
return;
}
if (strcmp(name, "label") == 0)
virstor_label(req);
else if (strcmp(name, "clear") == 0)
virstor_clear(req);
else if (strcmp(name, "dump") == 0)
virstor_dump(req);
else
gctl_error(req, "%s: Unknown command: %s.", __func__, name);
/* No CTASSERT in userland
CTASSERT(VIRSTOR_MAP_BLOCK_ENTRIES*VIRSTOR_MAP_ENTRY_SIZE == MAXPHYS);
*/
}
static void
pathgen(const char *name, char *path, size_t size)
{
if (strncmp(name, _PATH_DEV, sizeof(_PATH_DEV) - 1) != 0)
snprintf(path, size, "%s%s", _PATH_DEV, name);
else
strlcpy(path, name, size);
}
static int
my_g_metadata_store(const char *name, u_char *md, size_t size)
{
char path[MAXPATHLEN];
unsigned sectorsize;
off_t mediasize;
u_char *sector;
int error, fd;
pathgen(name, path, sizeof(path));
sector = NULL;
error = 0;
fd = open(path, O_RDWR);
if (fd == -1)
return (errno);
mediasize = g_get_mediasize(name);
if (mediasize == 0) {
error = errno;
goto out;
}
sectorsize = g_get_sectorsize(name);
if (sectorsize == 0) {
error = errno;
goto out;
}
assert(sectorsize >= size);
sector = malloc(sectorsize);
if (sector == NULL) {
error = ENOMEM;
goto out;
}
bcopy(md, sector, size);
if (pwrite(fd, sector, sectorsize, mediasize - sectorsize) !=
(ssize_t)sectorsize) {
error = errno;
goto out;
}
out:
if (sector != NULL)
free(sector);
close(fd);
return (error);
}
/*
* Labels a new geom Meaning: parses and checks the parameters, calculates &
* writes metadata to the relevant providers so when the next round of
* "tasting" comes (which will be just after the provider(s) are closed) geom
* can be instantiated with the tasted metadata.
*/
static void
virstor_label(struct gctl_req *req)
{
struct g_virstor_metadata md;
off_t msize;
unsigned char *sect;
unsigned int i;
size_t ssize, secsize;
const char *name;
char param[32];
int hardcode, nargs, error;
struct virstor_map_entry *map;
size_t total_chunks; /* We'll run out of memory if
this needs to be bigger. */
unsigned int map_chunks; /* Chunks needed by the map (map size). */
size_t map_size; /* In bytes. */
ssize_t written;
int fd;
nargs = gctl_get_int(req, "nargs");
if (nargs < 2) {
gctl_error(req, "Too few arguments (%d): expecting: name "
"provider0 [provider1 ...]", nargs);
return;
}
hardcode = gctl_get_int(req, "hardcode");
/*
* Initialize constant parts of metadata: magic signature, version,
* name.
*/
bzero(&md, sizeof(md));
strlcpy(md.md_magic, G_VIRSTOR_MAGIC, sizeof(md.md_magic));
md.md_version = G_VIRSTOR_VERSION;
name = gctl_get_ascii(req, "arg0");
if (name == NULL) {
gctl_error(req, "No 'arg%u' argument.", 0);
return;
}
strlcpy(md.md_name, name, sizeof(md.md_name));
md.md_virsize = (off_t)gctl_get_intmax(req, "vir_size");
md.md_chunk_size = gctl_get_intmax(req, "chunk_size");
md.md_count = nargs - 1;
if (md.md_virsize == 0 || md.md_chunk_size == 0) {
gctl_error(req, "Virtual size and chunk size must be non-zero");
return;
}
if (md.md_chunk_size % MAXPHYS != 0) {
/* XXX: This is not strictly needed, but it's convenient to
* impose some limitations on it, so why not MAXPHYS. */
size_t new_size = (md.md_chunk_size / MAXPHYS) * MAXPHYS;
if (new_size < md.md_chunk_size)
new_size += MAXPHYS;
fprintf(stderr, "Resizing chunk size to be a multiple of "
"MAXPHYS (%d kB).\n", MAXPHYS / 1024);
fprintf(stderr, "New chunk size: %zu kB\n", new_size / 1024);
md.md_chunk_size = new_size;
}
if (md.md_virsize % md.md_chunk_size != 0) {
off_t chunk_count = md.md_virsize / md.md_chunk_size;
md.md_virsize = chunk_count * md.md_chunk_size;
fprintf(stderr, "Resizing virtual size to be a multiple of "
"chunk size.\n");
fprintf(stderr, "New virtual size: %zu MB\n",
(size_t)(md.md_virsize/(1024 * 1024)));
}
msize = secsize = 0;
for (i = 1; i < (unsigned)nargs; i++) {
snprintf(param, sizeof(param), "arg%u", i);
name = gctl_get_ascii(req, "%s", param);
ssize = g_get_sectorsize(name);
if (ssize == 0)
fprintf(stderr, "%s for %s\n", strerror(errno), name);
msize += g_get_mediasize(name);
if (secsize == 0)
secsize = ssize;
else if (secsize != ssize) {
gctl_error(req, "Devices need to have same sector size "
"(%u on %s needs to be %u).",
(u_int)ssize, name, (u_int)secsize);
return;
}
}
if (secsize == 0) {
gctl_error(req, "Device not specified");
return;
}
if (md.md_chunk_size % secsize != 0) {
fprintf(stderr, "Error: chunk size is not a multiple of sector "
"size.");
gctl_error(req, "Chunk size (in bytes) must be multiple of %u.",
(unsigned int)secsize);
return;
}
total_chunks = md.md_virsize / md.md_chunk_size;
map_size = total_chunks * sizeof(*map);
assert(md.md_virsize % md.md_chunk_size == 0);
ssize = map_size % secsize;
if (ssize != 0) {
size_t add_chunks = (secsize - ssize) / sizeof(*map);
total_chunks += add_chunks;
md.md_virsize = (off_t)total_chunks * (off_t)md.md_chunk_size;
map_size = total_chunks * sizeof(*map);
fprintf(stderr, "Resizing virtual size to fit virstor "
"structures.\n");
fprintf(stderr, "New virtual size: %ju MB (%zu new chunks)\n",
(uintmax_t)(md.md_virsize / (1024 * 1024)), add_chunks);
}
if (verbose)
printf("Total virtual chunks: %zu (%zu MB each), %ju MB total "
"virtual size.\n",
total_chunks, (size_t)(md.md_chunk_size / (1024 * 1024)),
md.md_virsize/(1024 * 1024));
if ((off_t)md.md_virsize < msize)
fprintf(stderr, "WARNING: Virtual storage size < Physical "
"available storage (%ju < %ju)\n", md.md_virsize, msize);
/* Clear last sector first to spoil all components if device exists. */
if (verbose)
printf("Clearing metadata on");
for (i = 1; i < (unsigned)nargs; i++) {
snprintf(param, sizeof(param), "arg%u", i);
name = gctl_get_ascii(req, "%s", param);
if (verbose)
printf(" %s", name);
msize = g_get_mediasize(name);
ssize = g_get_sectorsize(name);
if (msize == 0 || ssize == 0) {
gctl_error(req, "Can't retrieve information about "
"%s: %s.", name, strerror(errno));
return;
}
if (msize < (off_t) MAX(md.md_chunk_size*4, map_size))
gctl_error(req, "Device %s is too small", name);
error = g_metadata_clear(name, NULL);
if (error != 0) {
gctl_error(req, "Can't clear metadata on %s: %s.", name,
strerror(error));
return;
}
}
/* Write allocation table to the first provider - this needs to be done
* before metadata is written because when kernel tastes it it's too
* late */
name = gctl_get_ascii(req, "arg1"); /* device with metadata */
if (verbose)
printf(".\nWriting allocation table to %s...", name);
/* How many chunks does the map occupy? */
map_chunks = map_size/md.md_chunk_size;
if (map_size % md.md_chunk_size != 0)
map_chunks++;
if (verbose) {
printf(" (%zu MB, %d chunks) ", map_size/(1024*1024), map_chunks);
fflush(stdout);
}
if (strncmp(name, _PATH_DEV, sizeof(_PATH_DEV) - 1) == 0)
fd = open(name, O_RDWR);
else {
sprintf(param, "%s%s", _PATH_DEV, name);
fd = open(param, O_RDWR);
}
if (fd < 0)
gctl_error(req, "Cannot open provider %s to write map", name);
/* Do it with calloc because there might be a need to set up chunk flags
* in the future */
map = calloc(total_chunks, sizeof(*map));
if (map == NULL) {
gctl_error(req,
"Out of memory (need %zu bytes for allocation map)",
map_size);
}
written = pwrite(fd, map, map_size, 0);
free(map);
if ((size_t)written != map_size) {
if (verbose) {
fprintf(stderr, "\nTried to write %zu, written %zd (%s)\n",
map_size, written, strerror(errno));
}
gctl_error(req, "Error writing out allocation map!");
return;
}
close (fd);
if (verbose)
printf("\nStoring metadata on ");
/*
* ID is randomly generated, unique for a geom. This is used to
* recognize all providers belonging to one geom.
*/
md.md_id = arc4random();
/* Ok, store metadata. */
for (i = 1; i < (unsigned)nargs; i++) {
snprintf(param, sizeof(param), "arg%u", i);
name = gctl_get_ascii(req, "%s", param);
msize = g_get_mediasize(name);
ssize = g_get_sectorsize(name);
if (verbose)
printf("%s ", name);
/* this provider's position/type in geom */
md.no = i - 1;
/* this provider's size */
md.provsize = msize;
/* chunk allocation info */
md.chunk_count = md.provsize / md.md_chunk_size;
if (verbose)
printf("(%u chunks) ", md.chunk_count);
/* Check to make sure last sector is unused */
if ((off_t)(md.chunk_count * md.md_chunk_size) > (off_t)(msize-ssize))
md.chunk_count--;
md.chunk_next = 0;
if (i != 1) {
md.chunk_reserved = 0;
md.flags = 0;
} else {
md.chunk_reserved = map_chunks * 2;
md.flags = VIRSTOR_PROVIDER_ALLOCATED |
VIRSTOR_PROVIDER_CURRENT;
md.chunk_next = md.chunk_reserved;
if (verbose)
printf("(%u reserved) ", md.chunk_reserved);
}
if (!hardcode)
bzero(md.provider, sizeof(md.provider));
else {
/* convert "/dev/something" to "something" */
if (strncmp(name, _PATH_DEV, sizeof(_PATH_DEV) - 1) == 0) {
strlcpy(md.provider, name + sizeof(_PATH_DEV) - 1,
sizeof(md.provider));
} else
strlcpy(md.provider, name, sizeof(md.provider));
}
sect = malloc(ssize);
if (sect == NULL)
err(1, "Cannot allocate sector of %zu bytes", ssize);
bzero(sect, ssize);
virstor_metadata_encode(&md, sect);
error = my_g_metadata_store(name, sect, ssize);
free(sect);
if (error != 0) {
if (verbose)
printf("\n");
fprintf(stderr, "Can't store metadata on %s: %s.\n",
name, strerror(error));
gctl_error(req,
"Not fully done (error storing metadata).");
return;
}
}
#if 0
if (verbose)
printf("\n");
#endif
}
/* Clears metadata on given provider(s) IF it's owned by us */
static void
virstor_clear(struct gctl_req *req)
{
const char *name;
char param[32];
unsigned i;
int nargs, error;
int fd;
nargs = gctl_get_int(req, "nargs");
if (nargs < 1) {
gctl_error(req, "Too few arguments.");
return;
}
for (i = 0; i < (unsigned)nargs; i++) {
snprintf(param, sizeof(param), "arg%u", i);
name = gctl_get_ascii(req, "%s", param);
error = g_metadata_clear(name, G_VIRSTOR_MAGIC);
if (error != 0) {
fprintf(stderr, "Can't clear metadata on %s: %s "
"(do I own it?)\n", name, strerror(error));
gctl_error(req,
"Not fully done (can't clear metadata).");
continue;
}
if (strncmp(name, _PATH_DEV, sizeof(_PATH_DEV) - 1) == 0)
fd = open(name, O_RDWR);
else {
sprintf(param, "%s%s", _PATH_DEV, name);
fd = open(param, O_RDWR);
}
if (fd < 0) {
gctl_error(req, "Cannot clear header sector for %s",
name);
continue;
}
if (verbose)
printf("Metadata cleared on %s.\n", name);
}
}
/* Print some metadata information */
static void
virstor_metadata_dump(const struct g_virstor_metadata *md)
{
printf(" Magic string: %s\n", md->md_magic);
printf(" Metadata version: %u\n", (u_int) md->md_version);
printf(" Device name: %s\n", md->md_name);
printf(" Device ID: %u\n", (u_int) md->md_id);
printf(" Provider index: %u\n", (u_int) md->no);
printf(" Active providers: %u\n", (u_int) md->md_count);
printf(" Hardcoded provider: %s\n",
md->provider[0] != '\0' ? md->provider : "(not hardcoded)");
printf(" Virtual size: %u MB\n",
(unsigned int)(md->md_virsize/(1024 * 1024)));
printf(" Chunk size: %u kB\n", md->md_chunk_size / 1024);
printf(" Chunks on provider: %u\n", md->chunk_count);
printf(" Chunks free: %u\n", md->chunk_count - md->chunk_next);
printf(" Reserved chunks: %u\n", md->chunk_reserved);
}
/* Called by geom(8) via gvirstor_main() to dump metadata information */
static void
virstor_dump(struct gctl_req *req)
{
struct g_virstor_metadata md;
u_char tmpmd[512]; /* temporary buffer */
const char *name;
char param[16];
int nargs, error, i;
assert(sizeof(tmpmd) >= sizeof(md));
nargs = gctl_get_int(req, "nargs");
if (nargs < 1) {
gctl_error(req, "Too few arguments.");
return;
}
for (i = 0; i < nargs; i++) {
snprintf(param, sizeof(param), "arg%u", i);
name = gctl_get_ascii(req, "%s", param);
error = g_metadata_read(name, (u_char *) & tmpmd, sizeof(tmpmd),
G_VIRSTOR_MAGIC);
if (error != 0) {
fprintf(stderr, "Can't read metadata from %s: %s.\n",
name, strerror(error));
gctl_error(req,
"Not fully done (error reading metadata).");
continue;
}
virstor_metadata_decode((u_char *) & tmpmd, &md);
printf("Metadata on %s:\n", name);
virstor_metadata_dump(&md);
printf("\n");
}
}