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Kent Overstreet 2010-12-16 01:22:45 -08:00
parent 7e97901075
commit 04a54144fd
3 changed files with 32 additions and 11 deletions
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10
Makefile
View File

@ -1,19 +1,19 @@
#PREFIX=/usr/local PREFIX=/usr
CFLAGS=-O2 -Wall -g CFLAGS=-O2 -Wall -g
all: make-bcache probe-bcache all: make-bcache probe-bcache
clean:
rm -f make-bcache bcache-test *.o
install: make-bcache probe-bcache install: make-bcache probe-bcache
install -m0755 make-bcache ${PREFIX}/sbin/ install -m0755 make-bcache ${PREFIX}/sbin/
install -m0755 probe-bcache ${PREFIX}/sbin/ install -m0755 probe-bcache /sbin/
install -m0644 61-bcache.rules /lib/udev/rules.d/ install -m0644 61-bcache.rules /lib/udev/rules.d/
install -m0755 initramfs /usr/share/initramfs-tools/hooks/bcache install -m0755 initramfs /usr/share/initramfs-tools/hooks/bcache
install -m0644 make-bcache.8 ${PREFIX}/share/man/man8
# install -m0755 bcache-test ${PREFIX}/sbin/ # install -m0755 bcache-test ${PREFIX}/sbin/
clean:
rm -f make-bcache bcache-test *.o
bcache-test: LDFLAGS += -lm -lssl -lcrypto bcache-test: LDFLAGS += -lm -lssl -lcrypto
make-bcache: LDFLAGS += -luuid make-bcache: LDFLAGS += -luuid

5
bcache.h
View File

@ -7,8 +7,9 @@ static const char bcache_magic[] = {
struct cache_sb { struct cache_sb {
uint8_t magic[16]; uint8_t magic[16];
#define CACHE_CLEAN 1 #define CACHE_CLEAN 1
#define CACHE_SYNC 2 #define CACHE_SYNC 2
#define CACHE_BACKING_DEVICE 4
uint32_t version; uint32_t version;
uint16_t block_size; /* sectors */ uint16_t block_size; /* sectors */
uint16_t bucket_size; /* sectors */ uint16_t bucket_size; /* sectors */

28
make-bcache.c
View File

@ -4,6 +4,7 @@
#include <fcntl.h> #include <fcntl.h>
#include <linux/fs.h> #include <linux/fs.h>
#include <stdbool.h>
#include <stdint.h> #include <stdint.h>
#include <stdio.h> #include <stdio.h>
#include <stdlib.h> #include <stdlib.h>
@ -58,21 +59,32 @@ long hatoi(const char *s)
void usage() void usage()
{ {
printf(""); printf("Usage: make-bcache [options] device\n"
" -C Format a cache device\n"
" -B Format a backing device\n"
" -b bucket size\n"
" -U UUID\n");
exit(EXIT_FAILURE); exit(EXIT_FAILURE);
} }
int main(int argc, char **argv) int main(int argc, char **argv)
{ {
int64_t nblocks, bucketsize = 32, blocksize = 8; bool cache = false, backingdev = false;
int64_t nblocks, bucketsize = 0, blocksize = 8;
int fd, i, c; int fd, i, c;
struct cache_sb sb; struct cache_sb sb;
char uuid[40]; char uuid[40];
uuid_generate(sb.uuid); uuid_generate(sb.uuid);
while ((c = getopt(argc, argv, "U:b:")) != -1) while ((c = getopt(argc, argv, "CBU:b:")) != -1)
switch (c) { switch (c) {
case 'C':
cache = true;
break;
case 'B':
backingdev = true;
break;
case 'b': case 'b':
bucketsize = hatoi(optarg) / 512; bucketsize = hatoi(optarg) / 512;
break; break;
@ -84,6 +96,14 @@ int main(int argc, char **argv)
break; break;
} }
if (!bucketsize)
bucketsize = cache ? 256 : 8192;
if (cache == backingdev) {
printf("Must specify one of -C or -B\n");
exit(EXIT_FAILURE);
}
if (argc <= optind) { if (argc <= optind) {
printf("Please supply a device\n"); printf("Please supply a device\n");
exit(EXIT_FAILURE); exit(EXIT_FAILURE);
@ -104,7 +124,7 @@ int main(int argc, char **argv)
} }
memcpy(sb.magic, bcache_magic, 16); memcpy(sb.magic, bcache_magic, 16);
sb.version = 0; sb.version = backingdev ? CACHE_BACKING_DEVICE : 0;
sb.block_size = blocksize; sb.block_size = blocksize;
sb.bucket_size = bucketsize; sb.bucket_size = bucketsize;
sb.nbuckets = nblocks / sb.bucket_size; sb.nbuckets = nblocks / sb.bucket_size;