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pax_global_header 0000666 0000000 0000000 00000000064 12225757524 0014525 g ustar 00root root 0000000 0000000 52 comment=89f11b135d1d57a5dbdc3548bfb9bfa0113075c4
bcache-tools/ 0000755 0000000 0000000 00000000000 12225757524 0013432 5 ustar 00root root 0000000 0000000 bcache-tools/.gitignore 0000644 0000000 0000000 00000000062 12225757524 0015420 0 ustar 00root root 0000000 0000000 bcache-super-show
make-bcache
probe-bcache
.*
*.o
bcache-tools/69-bcache.rules 0000644 0000000 0000000 00000001627 12225757524 0016155 0 ustar 00root root 0000000 0000000 # register bcache devices as they come up
# man 7 udev for syntax
SUBSYSTEM!="block", GOTO="bcache_end"
ACTION=="remove", GOTO="bcache_end"
# blkid was run by the standard udev rules
# It recognised bcache (util-linux 2.24+)
ENV{ID_FS_TYPE}=="bcache", GOTO="bcache_backing_found"
# It recognised something else; bail
ENV{ID_FS_TYPE}=="?*", GOTO="bcache_backing_end"
# Backing devices: scan, symlink, register
IMPORT{program}="probe-bcache -o udev $tempnode"
ENV{ID_FS_TYPE}!="bcache", GOTO="bcache_backing_end"
ENV{ID_FS_UUID_ENC}=="?*", SYMLINK+="disk/by-uuid/$env{ID_FS_UUID_ENC}"
LABEL="bcache_backing_found"
RUN+="bcache-register $tempnode"
LABEL="bcache_backing_end"
# Cached devices: symlink
DRIVER=="bcache", ENV{CACHED_UUID}=="?*", \
SYMLINK+="bcache/by-uuid/$env{CACHED_UUID}"
DRIVER=="bcache", ENV{CACHED_LABEL}=="?*", \
SYMLINK+="bcache/by-label/$env{CACHED_LABEL}"
LABEL="bcache_end"
bcache-tools/COPYING 0000644 0000000 0000000 00000043133 12225757524 0014471 0 ustar 00root root 0000000 0000000 GNU GENERAL PUBLIC LICENSE
Version 2, June 1991
Copyright (C) 1989, 1991 Free Software Foundation, Inc.
51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.
Preamble
The licenses for most software are designed to take away your
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When we speak of free software, we are referring to freedom, not
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END OF TERMS AND CONDITIONS
How to Apply These Terms to Your New Programs
If you develop a new program, and you want it to be of the greatest
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convey the exclusion of warranty; and each file should have at least
the "copyright" line and a pointer to where the full notice is found.
<one line to give the program's name and a brief idea of what it does.>
Copyright (C) <year> <name of author>
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Also add information on how to contact you by electronic and paper mail.
If the program is interactive, make it output a short notice like this
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Gnomovision version 69, Copyright (C) year name of author
Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
This is free software, and you are welcome to redistribute it
under certain conditions; type `show c' for details.
The hypothetical commands `show w' and `show c' should show the appropriate
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You should also get your employer (if you work as a programmer) or your
school, if any, to sign a "copyright disclaimer" for the program, if
necessary. Here is a sample; alter the names:
Yoyodyne, Inc., hereby disclaims all copyright interest in the program
`Gnomovision' (which makes passes at compilers) written by James Hacker.
<signature of Ty Coon>, 1 April 1989
Ty Coon, President of Vice
This General Public License does not permit incorporating your program into
proprietary programs. If your program is a subroutine library, you may
consider it more useful to permit linking proprietary applications with the
library. If this is what you want to do, use the GNU Library General
Public License instead of this License.
bcache-tools/Makefile 0000644 0000000 0000000 00000002406 12225757524 0015074 0 ustar 00root root 0000000 0000000
PREFIX=/usr
UDEVLIBDIR=/lib/udev
DRACUTLIBDIR=/lib/dracut
INSTALL=install
CFLAGS+=-O2 -Wall -g
all: make-bcache probe-bcache bcache-super-show
install: make-bcache probe-bcache bcache-super-show
$(INSTALL) -m0755 make-bcache bcache-super-show $(DESTDIR)${PREFIX}/sbin/
$(INSTALL) -m0755 probe-bcache bcache-register $(DESTDIR)$(UDEVLIBDIR)/
$(INSTALL) -m0644 69-bcache.rules $(DESTDIR)$(UDEVLIBDIR)/rules.d/
-$(INSTALL) -T -m0755 initramfs/hook $(DESTDIR)/usr/share/initramfs-tools/hooks/bcache
if [ -d $(DESTDIR)$(DRACUTLIBDIR)/modules.d ]; \
then $(INSTALL) -D -m0755 dracut/module-setup.sh $(DESTDIR)$(DRACUTLIBDIR)/modules.d/90bcache/module-setup.sh; \
fi
$(INSTALL) -m0644 -- *.8 $(DESTDIR)${PREFIX}/share/man/man8/
# $(INSTALL) -m0755 bcache-test $(DESTDIR)${PREFIX}/sbin/
clean:
$(RM) -f make-bcache probe-bcache bcache-super-show bcache-test *.o
bcache-test: LDLIBS += `pkg-config --libs openssl`
make-bcache: LDLIBS += `pkg-config --libs uuid blkid`
make-bcache: CFLAGS += `pkg-config --cflags uuid blkid`
make-bcache: bcache.o
probe-bcache: LDLIBS += `pkg-config --libs uuid blkid`
probe-bcache: CFLAGS += `pkg-config --cflags uuid blkid`
bcache-super-show: LDLIBS += `pkg-config --libs uuid`
bcache-super-show: CFLAGS += -std=gnu99
bcache-super-show: bcache.o
bcache-tools/README 0000644 0000000 0000000 00000002275 12225757524 0014320 0 ustar 00root root 0000000 0000000 These are the userspace tools required for bcache.
Bcache is a patch for the Linux kernel to use SSDs to cache other block
devices. For more information, see http://bcache.evilpiepirate.org.
Documentation for the run time interface is included in the kernel tree, in
Documentantion/bcache.txt.
Included tools:
make-bcache
Formats a block device for use with bcache. A device can be formatted for use
as a cache or as a backing device (requires yet to be implemented kernel
support). The most important option is for specifying the bucket size.
Allocation is done in terms of buckets, and cache hits are counted per bucket;
thus a smaller bucket size will give better cache utilization, but poorer write
performance. The bucket size is intended to be equal to the size of your SSD's
erase blocks, which seems to be 128k-512k for most SSDs; feel free to
experiment.
probe-bcache
Only necessary until support for the bcache superblock is included
in blkid; in the meantime, provides just enough functionality for a udev script
to create the /dev/disk/by-uuid symlink. The arguments it does support are the
same as for blkid.
bcache-super-show
Prints the bcache superblock of a cache device or a backing device.
bcache-tools/bcache-register 0000755 0000000 0000000 00000000171 12225757524 0016406 0 ustar 00root root 0000000 0000000 #!/bin/sh
/sbin/modprobe -qba bcache
test -f /sys/fs/bcache/register_quiet && echo "$1" > /sys/fs/bcache/register_quiet
bcache-tools/bcache-super-show.8 0000644 0000000 0000000 00000000314 12225757524 0017040 0 ustar 00root root 0000000 0000000 .TH bcache-super-show 8
.SH NAME
bcache-super-show \- Print the bcache superblock
.SH SYNOPSIS
.B bcache-super-show
[\fB \-f]
.I device
.SH OPTIONS
.TP
.BR \-f
Keep going if the superblock crc is invalid
bcache-tools/bcache-super-show.c 0000644 0000000 0000000 00000012335 12225757524 0017121 0 ustar 00root root 0000000 0000000 /*
* Author: Gabriel de Perthuis <g2p.code@gmail.com>
*
* GPLv2
*/
#define _FILE_OFFSET_BITS 64
#define __USE_FILE_OFFSET64
#define _XOPEN_SOURCE 500
#include <errno.h>
#include <fcntl.h>
#include <inttypes.h>
#include <linux/fs.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <uuid/uuid.h>
#include "bcache.h"
static void usage()
{
fprintf(stderr, "Usage: bcache-super-show [-f] <device>\n");
}
static bool accepted_char(char c)
{
if ('0' <= c && c <= '9')
return true;
if ('A' <= c && c <= 'Z')
return true;
if ('a' <= c && c <= 'z')
return true;
if (strchr(".-_", c))
return true;
return false;
}
static void print_encode(char* in)
{
for (char* pos = in; *pos; pos++)
if (accepted_char(*pos))
putchar(*pos);
else
printf("%%%x", *pos);
}
int main(int argc, char **argv)
{
bool force_csum = false;
int o;
extern char *optarg;
struct cache_sb sb;
char uuid[40];
uint64_t expected_csum;
while ((o = getopt(argc, argv, "f")) != EOF)
switch (o) {
case 'f':
force_csum = 1;
break;
default:
usage();
exit(1);
}
argv += optind;
argc -= optind;
if (argc != 1) {
usage();
exit(1);
}
int fd = open(argv[0], O_RDONLY);
if (fd < 0) {
printf("Can't open dev %s: %s\n", argv[0], strerror(errno));
exit(2);
}
if (pread(fd, &sb, sizeof(sb), SB_START) != sizeof(sb)) {
fprintf(stderr, "Couldn't read\n");
exit(2);
}
printf("sb.magic\t\t");
if (!memcmp(sb.magic, bcache_magic, 16)) {
printf("ok\n");
} else {
printf("bad magic\n");
fprintf(stderr, "Invalid superblock (bad magic)\n");
exit(2);
}
printf("sb.first_sector\t\t%" PRIu64, sb.offset);
if (sb.offset == SB_SECTOR) {
printf(" [match]\n");
} else {
printf(" [expected %ds]\n", SB_SECTOR);
fprintf(stderr, "Invalid superblock (bad sector)\n");
exit(2);
}
printf("sb.csum\t\t\t%" PRIX64, sb.csum);
expected_csum = csum_set(&sb);
if (sb.csum == expected_csum) {
printf(" [match]\n");
} else {
printf(" [expected %" PRIX64 "]\n", expected_csum);
if (!force_csum) {
fprintf(stderr, "Corrupt superblock (bad csum)\n");
exit(2);
}
}
printf("sb.version\t\t%" PRIu64, sb.version);
switch (sb.version) {
// These are handled the same by the kernel
case BCACHE_SB_VERSION_CDEV:
case BCACHE_SB_VERSION_CDEV_WITH_UUID:
printf(" [cache device]\n");
break;
// The second adds data offset support
case BCACHE_SB_VERSION_BDEV:
case BCACHE_SB_VERSION_BDEV_WITH_OFFSET:
printf(" [backing device]\n");
break;
default:
printf(" [unknown]\n");
// exit code?
return 0;
}
putchar('\n');
char label[SB_LABEL_SIZE + 1];
strncpy(label, (char*)sb.label, SB_LABEL_SIZE);
label[SB_LABEL_SIZE] = '\0';
printf("dev.label\t\t");
if (*label)
print_encode(label);
else
printf("(empty)");
putchar('\n');
uuid_unparse(sb.uuid, uuid);
printf("dev.uuid\t\t%s\n", uuid);
printf("dev.sectors_per_block\t%u\n"
"dev.sectors_per_bucket\t%u\n",
sb.block_size,
sb.bucket_size);
if (!SB_IS_BDEV(&sb)) {
// total_sectors includes the superblock;
printf("dev.cache.first_sector\t%u\n"
"dev.cache.cache_sectors\t%ju\n"
"dev.cache.total_sectors\t%ju\n"
"dev.cache.ordered\t%s\n"
"dev.cache.discard\t%s\n"
"dev.cache.pos\t\t%u\n"
"dev.cache.replacement\t%ju",
sb.bucket_size * sb.first_bucket,
sb.bucket_size * (sb.nbuckets - sb.first_bucket),
sb.bucket_size * sb.nbuckets,
CACHE_SYNC(&sb) ? "yes" : "no",
CACHE_DISCARD(&sb) ? "yes" : "no",
sb.nr_this_dev,
CACHE_REPLACEMENT(&sb));
switch (CACHE_REPLACEMENT(&sb)) {
case CACHE_REPLACEMENT_LRU:
printf(" [lru]\n");
break;
case CACHE_REPLACEMENT_FIFO:
printf(" [fifo]\n");
break;
case CACHE_REPLACEMENT_RANDOM:
printf(" [random]\n");
break;
default:
putchar('\n');
}
} else {
uint64_t first_sector;
if (sb.version == BCACHE_SB_VERSION_BDEV) {
first_sector = BDEV_DATA_START_DEFAULT;
} else {
if (sb.keys == 1 || sb.d[0]) {
fprintf(stderr,
"Possible experimental format detected, bailing\n");
exit(3);
}
first_sector = sb.data_offset;
}
printf("dev.data.first_sector\t%ju\n"
"dev.data.cache_mode\t%ju",
first_sector,
BDEV_CACHE_MODE(&sb));
switch (BDEV_CACHE_MODE(&sb)) {
case CACHE_MODE_WRITETHROUGH:
printf(" [writethrough]\n");
break;
case CACHE_MODE_WRITEBACK:
printf(" [writeback]\n");
break;
case CACHE_MODE_WRITEAROUND:
printf(" [writearound]\n");
break;
case CACHE_MODE_NONE:
printf(" [no caching]\n");
break;
default:
putchar('\n');
}
printf("dev.data.cache_state\t%ju",
BDEV_STATE(&sb));
switch (BDEV_STATE(&sb)) {
case BDEV_STATE_NONE:
printf(" [detached]\n");
break;
case BDEV_STATE_CLEAN:
printf(" [clean]\n");
break;
case BDEV_STATE_DIRTY:
printf(" [dirty]\n");
break;
case BDEV_STATE_STALE:
printf(" [inconsistent]\n");
break;
default:
putchar('\n');
}
}
putchar('\n');
uuid_unparse(sb.set_uuid, uuid);
printf("cset.uuid\t\t%s\n", uuid);
return 0;
}
bcache-tools/bcache-test.c 0000644 0000000 0000000 00000014437 12225757524 0015771 0 ustar 00root root 0000000 0000000 /*
* Author: Kent Overstreet <kmo@daterainc.com>
*
* GPLv2
*/
#define _FILE_OFFSET_BITS 64
#define _XOPEN_SOURCE 500
#define _GNU_SOURCE
#include <fcntl.h>
#include <limits.h>
#include <linux/fs.h>
#include <math.h>
#include <stdbool.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <sys/klog.h>
#include <sys/param.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <stdlib.h>
#include <stdint.h>
#include <time.h>
#include <openssl/rc4.h>
#include <openssl/md4.h>
static const unsigned char bcache_magic[] = {
0xc6, 0x85, 0x73, 0xf6, 0x4e, 0x1a, 0x45, 0xca,
0x82, 0x65, 0xf5, 0x7f, 0x48, 0xba, 0x6d, 0x81 };
unsigned char zero[4096];
bool klog = false;
#define Pread(fd, buf, size, offset) do { \
int _read = 0, _r; \
while (_read < size) { \
_r = pread(fd, buf, (size) - _read, (offset) + _read); \
if (_r <= 0) \
goto err; \
_read += _r; \
} \
} while (0)
#define Pwrite(fd, buf, size, offset) do { \
int _write = 0, _r; \
while (_write < size) { \
_r = pwrite(fd, buf, (size) - _write, offset + _write); \
if (_r < 0) \
goto err; \
_write += _r; \
} \
} while (0)
/* Marsaglia polar method
*/
double normal()
{
double x, y, s;
static double n = 0 / (double) 0;
if (n == n) {
x = n;
n = 0 / (double) 0;
return x;
}
do {
x = random() / (double) (RAND_MAX / 2) - 1;
y = random() / (double) (RAND_MAX / 2) - 1;
s = x * x + y * y;
} while (s >= 1);
s = sqrt(-2 * log(s) / s);
n = y * s;
return x * s;
}
long getblocks(int fd)
{
long ret;
struct stat statbuf;
if (fstat(fd, &statbuf)) {
perror("stat error");
exit(EXIT_FAILURE);
}
ret = statbuf.st_size / 512;
if (S_ISBLK(statbuf.st_mode))
if (ioctl(fd, BLKGETSIZE, &ret)) {
perror("ioctl error");
exit(EXIT_FAILURE);
}
return ret;
}
struct pagestuff {
unsigned char csum[16];
unsigned char oldcsum[16];
int readcount;
int writecount;
};
void flushlog(void)
{
char logbuf[1 << 21];
int w = 0, len;
static int fd;
if (!klog)
return;
if (!fd) {
klogctl(8, 0, 6);
sprintf(logbuf, "log.%i", abs(random()) % 1000);
fd = open(logbuf, O_WRONLY|O_CREAT|O_TRUNC, 0644);
if (fd == -1) {
perror("Error opening log file");
exit(EXIT_FAILURE);
}
}
len = klogctl(4, logbuf, 1 << 21);
if (len == -1) {
perror("Error reading kernel log");
exit(EXIT_FAILURE);
}
while (w < len) {
int r = write(fd, logbuf + w, len - w);
if (r == -1) {
perror("Error writing log");
exit(EXIT_FAILURE);
}
w += r;
}
}
void aio_loop(int nr)
{
}
void usage()
{
exit(EXIT_FAILURE);
}
int main(int argc, char **argv)
{
bool walk = false, randsize = false, verbose = false, csum = false, rtest = false, wtest = false;
int fd1, fd2 = 0, direct = 0, nbytes = 4096, j, o;
unsigned long size, i, offset = 0, done = 0, unique = 0, benchmark = 0;
void *buf1 = NULL, *buf2 = NULL;
struct pagestuff *pages, *p;
unsigned char c[16];
time_t last_printed = 0;
extern char *optarg;
RC4_KEY writedata;
RC4_set_key(&writedata, 16, bcache_magic);
while ((o = getopt(argc, argv, "dnwvscwlb:")) != EOF)
switch (o) {
case 'd':
direct = O_DIRECT;
break;
case 'n':
walk = true;
break;
case 'v':
verbose = true;
break;
case 's':
randsize = true;
break;
case 'c':
csum = true;
break;
case 'w':
wtest = true;
break;
case 'r':
rtest = true;
break;
case 'l':
klog = true;
break;
case 'b':
benchmark = atol(optarg);
break;
default:
usage();
}
argv += optind;
argc -= optind;
if (!rtest && !wtest)
rtest = true;
if (argc < 1) {
printf("Please enter a device to test\n");
exit(EXIT_FAILURE);
}
if (!csum && !benchmark && argc < 2) {
printf("Please enter a device to compare against\n");
exit(EXIT_FAILURE);
}
fd1 = open(argv[0], (wtest ? O_RDWR : O_RDONLY)|direct);
if (!csum && !benchmark)
fd2 = open(argv[1], (wtest ? O_RDWR : O_RDONLY)|direct);
if (fd1 == -1 || fd2 == -1) {
perror("Error opening device");
exit(EXIT_FAILURE);
}
size = getblocks(fd1);
if (!csum && !benchmark)
size = MIN(size, getblocks(fd2));
size = size / 8 - 16;
pages = calloc(size + 16, sizeof(*pages));
printf("size %li\n", size);
if (posix_memalign(&buf1, 4096, 4096 * 16) ||
posix_memalign(&buf2, 4096, 4096 * 16)) {
printf("Could not allocate buffers\n");
exit(EXIT_FAILURE);
}
//setvbuf(stdout, NULL, _IONBF, 0);
for (i = 0; !benchmark || i < benchmark; i++) {
bool writing = (wtest && (i & 1)) || !rtest;
nbytes = randsize ? drand48() * 16 + 1 : 1;
nbytes <<= 12;
offset >>= 12;
offset += walk ? normal() * 20 : random();
offset %= size;
offset <<= 12;
if (!(i % 200))
flushlog();
if (!verbose) {
time_t now = time(NULL);
if (now - last_printed >= 2) {
last_printed = now;
goto print;
}
} else
print: printf("Loop %6li offset %9li sectors %3i, %6lu mb done, %6lu mb unique\n",
i, offset >> 9, nbytes >> 9, done >> 11, unique >> 11);
done += nbytes >> 9;
if (!writing)
Pread(fd1, buf1, nbytes, offset);
if (!writing && !csum && !benchmark)
Pread(fd2, buf2, nbytes, offset);
for (j = 0; j < nbytes; j += 4096) {
p = &pages[(offset + j) / 4096];
if (writing)
RC4(&writedata, 4096, zero, buf1 + j);
if (csum) {
MD4(buf1 + j, 4096, &c[0]);
if (writing ||
(!p->readcount && !p->writecount)) {
memcpy(&p->oldcsum[0], &p->csum[0], 16);
memcpy(&p->csum[0], c, 16);
} else if (memcmp(&p->csum[0], c, 16))
goto bad;
} else if (!writing && !benchmark &&
memcmp(buf1 + j,
buf2 + j,
4096))
goto bad;
if (!p->writecount && !p->readcount)
unique += 8;
writing ? p->writecount++ : p->readcount++;
}
if (writing)
Pwrite(fd1, buf1, nbytes, offset);
if (writing && !csum && !benchmark)
Pwrite(fd2, buf2, nbytes, offset);
}
printf("Loop %6li offset %9li sectors %3i, %6lu mb done, %6lu mb unique\n",
i, offset >> 9, nbytes >> 9, done >> 11, unique >> 11);
exit(EXIT_SUCCESS);
err:
perror("IO error");
flushlog();
exit(EXIT_FAILURE);
bad:
printf("Bad read! loop %li offset %li readcount %i writecount %i\n",
i, (offset + j) >> 9, p->readcount, p->writecount);
if (!memcmp(&p->oldcsum[0], c, 16))
printf("Matches previous csum\n");
flushlog();
exit(EXIT_FAILURE);
}
bcache-tools/bcache.c 0000644 0000000 0000000 00000016436 12225757524 0015015 0 ustar 00root root 0000000 0000000 #define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <unistd.h>
/*
* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group (Any
* use permitted, subject to terms of PostgreSQL license; see.)
* If we have a 64-bit integer type, then a 64-bit CRC looks just like the
* usual sort of implementation. (See Ross Williams' excellent introduction
* A PAINLESS GUIDE TO CRC ERROR DETECTION ALGORITHMS, available from
* ftp://ftp.rocksoft.com/papers/crc_v3.txt or several other net sites.)
* If we have no working 64-bit type, then fake it with two 32-bit registers.
*
* The present implementation is a normal (not "reflected", in Williams'
* terms) 64-bit CRC, using initial all-ones register contents and a final
* bit inversion. The chosen polynomial is borrowed from the DLT1 spec
* (ECMA-182, available from http://www.ecma.ch/ecma1/STAND/ECMA-182.HTM):
*
* x^64 + x^62 + x^57 + x^55 + x^54 + x^53 + x^52 + x^47 + x^46 + x^45 +
* x^40 + x^39 + x^38 + x^37 + x^35 + x^33 + x^32 + x^31 + x^29 + x^27 +
* x^24 + x^23 + x^22 + x^21 + x^19 + x^17 + x^13 + x^12 + x^10 + x^9 +
* x^7 + x^4 + x + 1
*/
static const uint64_t crc_table[256] = {
0x0000000000000000ULL, 0x42F0E1EBA9EA3693ULL, 0x85E1C3D753D46D26ULL,
0xC711223CFA3E5BB5ULL, 0x493366450E42ECDFULL, 0x0BC387AEA7A8DA4CULL,
0xCCD2A5925D9681F9ULL, 0x8E224479F47CB76AULL, 0x9266CC8A1C85D9BEULL,
0xD0962D61B56FEF2DULL, 0x17870F5D4F51B498ULL, 0x5577EEB6E6BB820BULL,
0xDB55AACF12C73561ULL, 0x99A54B24BB2D03F2ULL, 0x5EB4691841135847ULL,
0x1C4488F3E8F96ED4ULL, 0x663D78FF90E185EFULL, 0x24CD9914390BB37CULL,
0xE3DCBB28C335E8C9ULL, 0xA12C5AC36ADFDE5AULL, 0x2F0E1EBA9EA36930ULL,
0x6DFEFF5137495FA3ULL, 0xAAEFDD6DCD770416ULL, 0xE81F3C86649D3285ULL,
0xF45BB4758C645C51ULL, 0xB6AB559E258E6AC2ULL, 0x71BA77A2DFB03177ULL,
0x334A9649765A07E4ULL, 0xBD68D2308226B08EULL, 0xFF9833DB2BCC861DULL,
0x388911E7D1F2DDA8ULL, 0x7A79F00C7818EB3BULL, 0xCC7AF1FF21C30BDEULL,
0x8E8A101488293D4DULL, 0x499B3228721766F8ULL, 0x0B6BD3C3DBFD506BULL,
0x854997BA2F81E701ULL, 0xC7B97651866BD192ULL, 0x00A8546D7C558A27ULL,
0x4258B586D5BFBCB4ULL, 0x5E1C3D753D46D260ULL, 0x1CECDC9E94ACE4F3ULL,
0xDBFDFEA26E92BF46ULL, 0x990D1F49C77889D5ULL, 0x172F5B3033043EBFULL,
0x55DFBADB9AEE082CULL, 0x92CE98E760D05399ULL, 0xD03E790CC93A650AULL,
0xAA478900B1228E31ULL, 0xE8B768EB18C8B8A2ULL, 0x2FA64AD7E2F6E317ULL,
0x6D56AB3C4B1CD584ULL, 0xE374EF45BF6062EEULL, 0xA1840EAE168A547DULL,
0x66952C92ECB40FC8ULL, 0x2465CD79455E395BULL, 0x3821458AADA7578FULL,
0x7AD1A461044D611CULL, 0xBDC0865DFE733AA9ULL, 0xFF3067B657990C3AULL,
0x711223CFA3E5BB50ULL, 0x33E2C2240A0F8DC3ULL, 0xF4F3E018F031D676ULL,
0xB60301F359DBE0E5ULL, 0xDA050215EA6C212FULL, 0x98F5E3FE438617BCULL,
0x5FE4C1C2B9B84C09ULL, 0x1D14202910527A9AULL, 0x93366450E42ECDF0ULL,
0xD1C685BB4DC4FB63ULL, 0x16D7A787B7FAA0D6ULL, 0x5427466C1E109645ULL,
0x4863CE9FF6E9F891ULL, 0x0A932F745F03CE02ULL, 0xCD820D48A53D95B7ULL,
0x8F72ECA30CD7A324ULL, 0x0150A8DAF8AB144EULL, 0x43A04931514122DDULL,
0x84B16B0DAB7F7968ULL, 0xC6418AE602954FFBULL, 0xBC387AEA7A8DA4C0ULL,
0xFEC89B01D3679253ULL, 0x39D9B93D2959C9E6ULL, 0x7B2958D680B3FF75ULL,
0xF50B1CAF74CF481FULL, 0xB7FBFD44DD257E8CULL, 0x70EADF78271B2539ULL,
0x321A3E938EF113AAULL, 0x2E5EB66066087D7EULL, 0x6CAE578BCFE24BEDULL,
0xABBF75B735DC1058ULL, 0xE94F945C9C3626CBULL, 0x676DD025684A91A1ULL,
0x259D31CEC1A0A732ULL, 0xE28C13F23B9EFC87ULL, 0xA07CF2199274CA14ULL,
0x167FF3EACBAF2AF1ULL, 0x548F120162451C62ULL, 0x939E303D987B47D7ULL,
0xD16ED1D631917144ULL, 0x5F4C95AFC5EDC62EULL, 0x1DBC74446C07F0BDULL,
0xDAAD56789639AB08ULL, 0x985DB7933FD39D9BULL, 0x84193F60D72AF34FULL,
0xC6E9DE8B7EC0C5DCULL, 0x01F8FCB784FE9E69ULL, 0x43081D5C2D14A8FAULL,
0xCD2A5925D9681F90ULL, 0x8FDAB8CE70822903ULL, 0x48CB9AF28ABC72B6ULL,
0x0A3B7B1923564425ULL, 0x70428B155B4EAF1EULL, 0x32B26AFEF2A4998DULL,
0xF5A348C2089AC238ULL, 0xB753A929A170F4ABULL, 0x3971ED50550C43C1ULL,
0x7B810CBBFCE67552ULL, 0xBC902E8706D82EE7ULL, 0xFE60CF6CAF321874ULL,
0xE224479F47CB76A0ULL, 0xA0D4A674EE214033ULL, 0x67C58448141F1B86ULL,
0x253565A3BDF52D15ULL, 0xAB1721DA49899A7FULL, 0xE9E7C031E063ACECULL,
0x2EF6E20D1A5DF759ULL, 0x6C0603E6B3B7C1CAULL, 0xF6FAE5C07D3274CDULL,
0xB40A042BD4D8425EULL, 0x731B26172EE619EBULL, 0x31EBC7FC870C2F78ULL,
0xBFC9838573709812ULL, 0xFD39626EDA9AAE81ULL, 0x3A28405220A4F534ULL,
0x78D8A1B9894EC3A7ULL, 0x649C294A61B7AD73ULL, 0x266CC8A1C85D9BE0ULL,
0xE17DEA9D3263C055ULL, 0xA38D0B769B89F6C6ULL, 0x2DAF4F0F6FF541ACULL,
0x6F5FAEE4C61F773FULL, 0xA84E8CD83C212C8AULL, 0xEABE6D3395CB1A19ULL,
0x90C79D3FEDD3F122ULL, 0xD2377CD44439C7B1ULL, 0x15265EE8BE079C04ULL,
0x57D6BF0317EDAA97ULL, 0xD9F4FB7AE3911DFDULL, 0x9B041A914A7B2B6EULL,
0x5C1538ADB04570DBULL, 0x1EE5D94619AF4648ULL, 0x02A151B5F156289CULL,
0x4051B05E58BC1E0FULL, 0x87409262A28245BAULL, 0xC5B073890B687329ULL,
0x4B9237F0FF14C443ULL, 0x0962D61B56FEF2D0ULL, 0xCE73F427ACC0A965ULL,
0x8C8315CC052A9FF6ULL, 0x3A80143F5CF17F13ULL, 0x7870F5D4F51B4980ULL,
0xBF61D7E80F251235ULL, 0xFD913603A6CF24A6ULL, 0x73B3727A52B393CCULL,
0x31439391FB59A55FULL, 0xF652B1AD0167FEEAULL, 0xB4A25046A88DC879ULL,
0xA8E6D8B54074A6ADULL, 0xEA16395EE99E903EULL, 0x2D071B6213A0CB8BULL,
0x6FF7FA89BA4AFD18ULL, 0xE1D5BEF04E364A72ULL, 0xA3255F1BE7DC7CE1ULL,
0x64347D271DE22754ULL, 0x26C49CCCB40811C7ULL, 0x5CBD6CC0CC10FAFCULL,
0x1E4D8D2B65FACC6FULL, 0xD95CAF179FC497DAULL, 0x9BAC4EFC362EA149ULL,
0x158E0A85C2521623ULL, 0x577EEB6E6BB820B0ULL, 0x906FC95291867B05ULL,
0xD29F28B9386C4D96ULL, 0xCEDBA04AD0952342ULL, 0x8C2B41A1797F15D1ULL,
0x4B3A639D83414E64ULL, 0x09CA82762AAB78F7ULL, 0x87E8C60FDED7CF9DULL,
0xC51827E4773DF90EULL, 0x020905D88D03A2BBULL, 0x40F9E43324E99428ULL,
0x2CFFE7D5975E55E2ULL, 0x6E0F063E3EB46371ULL, 0xA91E2402C48A38C4ULL,
0xEBEEC5E96D600E57ULL, 0x65CC8190991CB93DULL, 0x273C607B30F68FAEULL,
0xE02D4247CAC8D41BULL, 0xA2DDA3AC6322E288ULL, 0xBE992B5F8BDB8C5CULL,
0xFC69CAB42231BACFULL, 0x3B78E888D80FE17AULL, 0x7988096371E5D7E9ULL,
0xF7AA4D1A85996083ULL, 0xB55AACF12C735610ULL, 0x724B8ECDD64D0DA5ULL,
0x30BB6F267FA73B36ULL, 0x4AC29F2A07BFD00DULL, 0x08327EC1AE55E69EULL,
0xCF235CFD546BBD2BULL, 0x8DD3BD16FD818BB8ULL, 0x03F1F96F09FD3CD2ULL,
0x41011884A0170A41ULL, 0x86103AB85A2951F4ULL, 0xC4E0DB53F3C36767ULL,
0xD8A453A01B3A09B3ULL, 0x9A54B24BB2D03F20ULL, 0x5D45907748EE6495ULL,
0x1FB5719CE1045206ULL, 0x919735E51578E56CULL, 0xD367D40EBC92D3FFULL,
0x1476F63246AC884AULL, 0x568617D9EF46BED9ULL, 0xE085162AB69D5E3CULL,
0xA275F7C11F7768AFULL, 0x6564D5FDE549331AULL, 0x279434164CA30589ULL,
0xA9B6706FB8DFB2E3ULL, 0xEB46918411358470ULL, 0x2C57B3B8EB0BDFC5ULL,
0x6EA7525342E1E956ULL, 0x72E3DAA0AA188782ULL, 0x30133B4B03F2B111ULL,
0xF7021977F9CCEAA4ULL, 0xB5F2F89C5026DC37ULL, 0x3BD0BCE5A45A6B5DULL,
0x79205D0E0DB05DCEULL, 0xBE317F32F78E067BULL, 0xFCC19ED95E6430E8ULL,
0x86B86ED5267CDBD3ULL, 0xC4488F3E8F96ED40ULL, 0x0359AD0275A8B6F5ULL,
0x41A94CE9DC428066ULL, 0xCF8B0890283E370CULL, 0x8D7BE97B81D4019FULL,
0x4A6ACB477BEA5A2AULL, 0x089A2AACD2006CB9ULL, 0x14DEA25F3AF9026DULL,
0x562E43B4931334FEULL, 0x913F6188692D6F4BULL, 0xD3CF8063C0C759D8ULL,
0x5DEDC41A34BBEEB2ULL, 0x1F1D25F19D51D821ULL, 0xD80C07CD676F8394ULL,
0x9AFCE626CE85B507ULL
};
inline uint64_t crc64(const void *_data, size_t len)
{
uint64_t crc = 0xFFFFFFFFFFFFFFFFULL;
const unsigned char *data = _data;
while (len--) {
int i = ((int) (crc >> 56) ^ *data++) & 0xFF;
crc = crc_table[i] ^ (crc << 8);
}
return crc ^ 0xFFFFFFFFFFFFFFFFULL;
}
bcache-tools/bcache.h 0000644 0000000 0000000 00000006044 12225757524 0015014 0 ustar 00root root 0000000 0000000 /*
* Author: Kent Overstreet <kmo@daterainc.com>
*
* GPLv2
*/
#ifndef _BCACHE_H
#define _BCACHE_H
#define BITMASK(name, type, field, offset, size) \
static inline uint64_t name(const type *k) \
{ return (k->field >> offset) & ~(((uint64_t) ~0) << size); } \
\
static inline void SET_##name(type *k, uint64_t v) \
{ \
k->field &= ~(~((uint64_t) ~0 << size) << offset); \
k->field |= v << offset; \
}
static const char bcache_magic[] = {
0xc6, 0x85, 0x73, 0xf6, 0x4e, 0x1a, 0x45, 0xca,
0x82, 0x65, 0xf5, 0x7f, 0x48, 0xba, 0x6d, 0x81 };
/*
* Version 0: Cache device
* Version 1: Backing device
* Version 2: Seed pointer into btree node checksum
* Version 3: Cache device with new UUID format
* Version 4: Backing device with data offset
*/
#define BCACHE_SB_VERSION_CDEV 0
#define BCACHE_SB_VERSION_BDEV 1
#define BCACHE_SB_VERSION_CDEV_WITH_UUID 3
#define BCACHE_SB_VERSION_BDEV_WITH_OFFSET 4
#define BCACHE_SB_MAX_VERSION 4
#define SB_SECTOR 8
#define SB_LABEL_SIZE 32
#define SB_JOURNAL_BUCKETS 256U
#define BDEV_DATA_START_DEFAULT 16 /* sectors */
#define SB_START (SB_SECTOR * 512)
struct cache_sb {
uint64_t csum;
uint64_t offset; /* sector where this sb was written */
uint64_t version;
uint8_t magic[16];
uint8_t uuid[16];
union {
uint8_t set_uuid[16];
uint64_t set_magic;
};
uint8_t label[SB_LABEL_SIZE];
uint64_t flags;
uint64_t seq;
uint64_t pad[8];
union {
struct {
/* Cache devices */
uint64_t nbuckets; /* device size */
uint16_t block_size; /* sectors */
uint16_t bucket_size; /* sectors */
uint16_t nr_in_set;
uint16_t nr_this_dev;
};
struct {
/* Backing devices */
uint64_t data_offset;
/*
* block_size from the cache device section is still used by
* backing devices, so don't add anything here until we fix
* things to not need it for backing devices anymore
*/
};
};
uint32_t last_mount; /* time_t */
uint16_t first_bucket;
union {
uint16_t njournal_buckets;
uint16_t keys;
};
uint64_t d[SB_JOURNAL_BUCKETS]; /* journal buckets */
};
static inline bool SB_IS_BDEV(const struct cache_sb *sb)
{
return sb->version == BCACHE_SB_VERSION_BDEV
|| sb->version == BCACHE_SB_VERSION_BDEV_WITH_OFFSET;
}
BITMASK(CACHE_SYNC, struct cache_sb, flags, 0, 1);
BITMASK(CACHE_DISCARD, struct cache_sb, flags, 1, 1);
BITMASK(CACHE_REPLACEMENT, struct cache_sb, flags, 2, 3);
#define CACHE_REPLACEMENT_LRU 0U
#define CACHE_REPLACEMENT_FIFO 1U
#define CACHE_REPLACEMENT_RANDOM 2U
BITMASK(BDEV_CACHE_MODE, struct cache_sb, flags, 0, 4);
#define CACHE_MODE_WRITETHROUGH 0U
#define CACHE_MODE_WRITEBACK 1U
#define CACHE_MODE_WRITEAROUND 2U
#define CACHE_MODE_NONE 3U
BITMASK(BDEV_STATE, struct cache_sb, flags, 61, 2);
#define BDEV_STATE_NONE 0U
#define BDEV_STATE_CLEAN 1U
#define BDEV_STATE_DIRTY 2U
#define BDEV_STATE_STALE 3U
uint64_t crc64(const void *_data, size_t len);
#define node(i, j) ((void *) ((i)->d + (j)))
#define end(i) node(i, (i)->keys)
#define csum_set(i) \
crc64(((void *) (i)) + 8, ((void *) end(i)) - (((void *) (i)) + 8))
#endif
bcache-tools/dracut/ 0000755 0000000 0000000 00000000000 12225757524 0014714 5 ustar 00root root 0000000 0000000 bcache-tools/dracut/module-setup.sh 0000644 0000000 0000000 00000001270 12225757524 0017673 0 ustar 00root root 0000000 0000000 #!/bin/bash
# -*- mode: shell-script; indent-tabs-mode: nil; sh-basic-offset: 4; -*-
# ex: ts=8 sw=4 sts=4 et filetype=sh
#
# At some point (util-linux v2.24) blkid will be able to identify bcache
# but until every system has this version of util-linux, probe-bcache is
# provided as an alternative.
#
check() {
if [[ $hostonly ]] || [[ $mount_needs ]]
then
for fs in "${host_fs_types[@]}"; do
[[ $fs = "bcache" ]] && return 0
done
return 255
fi
return 0
}
depends() {
return 0
}
installkernel() {
instmods bcache
}
install() {
inst_multiple ${udevdir}/probe-bcache ${udevdir}/bcache-register
inst_rules 69-bcache.rules
}
bcache-tools/initramfs/ 0000755 0000000 0000000 00000000000 12225757524 0015426 5 ustar 00root root 0000000 0000000 bcache-tools/initramfs/hook 0000755 0000000 0000000 00000000473 12225757524 0016320 0 ustar 00root root 0000000 0000000 #!/bin/sh
PREREQ="udev"
prereqs()
{
echo "$PREREQ"
}
case $1 in
prereqs)
prereqs
exit 0
;;
esac
. /usr/share/initramfs-tools/hook-functions
cp -pt "${DESTDIR}/lib/udev/rules.d" /lib/udev/rules.d/69-bcache.rules
copy_exec /lib/udev/bcache-register
copy_exec /lib/udev/probe-bcache
manual_add_modules bcache
bcache-tools/make-bcache.8 0000644 0000000 0000000 00000001372 12225757524 0015646 0 ustar 00root root 0000000 0000000 .TH make-bcache 8
.SH NAME
make-bcache \- create a cache device
.SH SYNOPSIS
.B make-bcache
[\fB \-U\ \fIUUID\fR ]
[\fB \-b\ \fIbucket-size\fR ]
.I device
.SH OPTIONS
.TP
.BR \-C
Create a cache
.TP
.BR \-B
Create a backing device (kernel functionality not yet implemented)
.TP
.BR \-U\ \fIUUID
Create a cache device with the specified UUID
.TP
.BR \-b\ \fIbucket-size
Spcifies the bucket size. Allocation is done in terms of buckets, and cache
hits are counted per bucket; thus a smaller bucket size will give better cache
utilization, but poorer write performance. The bucket size is intended to be
equal to the size of your SSD's erase blocks, which seems to be 128k-512k for
most SSDs. Must be a power of two; accepts human readable units. Defaults to
128k.
bcache-tools/make-bcache.c 0000644 0000000 0000000 00000024030 12225757524 0015715 0 ustar 00root root 0000000 0000000 /*
* Author: Kent Overstreet <kmo@daterainc.com>
*
* GPLv2
*/
#define _FILE_OFFSET_BITS 64
#define __USE_FILE_OFFSET64
#define _XOPEN_SOURCE 600
#include <blkid.h>
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <getopt.h>
#include <limits.h>
#include <linux/fs.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <uuid/uuid.h>
#include "bcache.h"
#define max(x, y) ({ \
typeof(x) _max1 = (x); \
typeof(y) _max2 = (y); \
(void) (&_max1 == &_max2); \
_max1 > _max2 ? _max1 : _max2; })
uint64_t getblocks(int fd)
{
uint64_t ret;
struct stat statbuf;
if (fstat(fd, &statbuf)) {
perror("stat error\n");
exit(EXIT_FAILURE);
}
ret = statbuf.st_size / 512;
if (S_ISBLK(statbuf.st_mode))
if (ioctl(fd, BLKGETSIZE, &ret)) {
perror("ioctl error");
exit(EXIT_FAILURE);
}
return ret;
}
uint64_t hatoi(const char *s)
{
char *e;
long long i = strtoll(s, &e, 10);
switch (*e) {
case 't':
case 'T':
i *= 1024;
case 'g':
case 'G':
i *= 1024;
case 'm':
case 'M':
i *= 1024;
case 'k':
case 'K':
i *= 1024;
}
return i;
}
unsigned hatoi_validate(const char *s, const char *msg)
{
uint64_t v = hatoi(s);
if (v & (v - 1)) {
fprintf(stderr, "%s must be a power of two\n", msg);
exit(EXIT_FAILURE);
}
v /= 512;
if (v > USHRT_MAX) {
fprintf(stderr, "%s too large\n", msg);
exit(EXIT_FAILURE);
}
if (!v) {
fprintf(stderr, "%s too small\n", msg);
exit(EXIT_FAILURE);
}
return v;
}
char *skip_spaces(const char *str)
{
while (isspace(*str))
++str;
return (char *)str;
}
char *strim(char *s)
{
size_t size;
char *end;
s = skip_spaces(s);
size = strlen(s);
if (!size)
return s;
end = s + size - 1;
while (end >= s && isspace(*end))
end--;
*(end + 1) = '\0';
return s;
}
ssize_t read_string_list(const char *buf, const char * const list[])
{
size_t i;
char *s, *d = strdup(buf);
if (!d)
return -ENOMEM;
s = strim(d);
for (i = 0; list[i]; i++)
if (!strcmp(list[i], s))
break;
free(d);
if (!list[i])
return -EINVAL;
return i;
}
void usage()
{
fprintf(stderr,
"Usage: make-bcache [options] device\n"
" -C, --cache Format a cache device\n"
" -B, --bdev Format a backing device\n"
" -b, --bucket bucket size\n"
" -w, --block block size (hard sector size of SSD, often 2k)\n"
" -o, --data-offset data offset in sectors\n"
" --cset-uuid UUID for the cache set\n"
// " -U UUID\n"
" --writeback enable writeback\n"
" --discard enable discards\n"
" --cache_replacement_policy=(lru|fifo)\n"
" -h, --help display this help and exit\n");
exit(EXIT_FAILURE);
}
const char * const cache_replacement_policies[] = {
"lru",
"fifo",
"random",
NULL
};
static void write_sb(char *dev, unsigned block_size, unsigned bucket_size,
bool writeback, bool discard, bool wipe_bcache,
unsigned cache_replacement_policy,
uint64_t data_offset,
uuid_t set_uuid, bool bdev)
{
int fd;
char uuid_str[40], set_uuid_str[40], zeroes[SB_START] = {0};
struct cache_sb sb;
blkid_probe pr;
if ((fd = open(dev, O_RDWR|O_EXCL)) == -1) {
fprintf(stderr, "Can't open dev %s: %s\n", dev, strerror(errno));
exit(EXIT_FAILURE);
}
if (pread(fd, &sb, sizeof(sb), SB_START) != sizeof(sb))
exit(EXIT_FAILURE);
if (!memcmp(sb.magic, bcache_magic, 16) && !wipe_bcache) {
fprintf(stderr, "Already a bcache device on %s, "
"overwrite with --wipe-bcache\n", dev);
exit(EXIT_FAILURE);
}
if (!(pr = blkid_new_probe()))
exit(EXIT_FAILURE);
if (blkid_probe_set_device(pr, fd, 0, 0))
exit(EXIT_FAILURE);
/* enable ptable probing; superblock probing is enabled by default */
if (blkid_probe_enable_partitions(pr, true))
exit(EXIT_FAILURE);
if (!blkid_do_probe(pr)) {
/* XXX wipefs doesn't know how to remove partition tables */
fprintf(stderr, "Device %s already has a non-bcache superblock, "
"remove it using wipefs and wipefs -a\n", dev);
exit(EXIT_FAILURE);
}
memset(&sb, 0, sizeof(struct cache_sb));
sb.offset = SB_SECTOR;
sb.version = bdev
? BCACHE_SB_VERSION_BDEV
: BCACHE_SB_VERSION_CDEV;
memcpy(sb.magic, bcache_magic, 16);
uuid_generate(sb.uuid);
memcpy(sb.set_uuid, set_uuid, sizeof(sb.set_uuid));
sb.bucket_size = bucket_size;
sb.block_size = block_size;
uuid_unparse(sb.uuid, uuid_str);
uuid_unparse(sb.set_uuid, set_uuid_str);
if (SB_IS_BDEV(&sb)) {
SET_BDEV_CACHE_MODE(
&sb, writeback ? CACHE_MODE_WRITEBACK : CACHE_MODE_WRITETHROUGH);
if (data_offset != BDEV_DATA_START_DEFAULT) {
sb.version = BCACHE_SB_VERSION_BDEV_WITH_OFFSET;
sb.data_offset = data_offset;
}
printf("UUID: %s\n"
"Set UUID: %s\n"
"version: %u\n"
"block_size: %u\n"
"data_offset: %ju\n",
uuid_str, set_uuid_str,
(unsigned) sb.version,
sb.block_size,
data_offset);
} else {
sb.nbuckets = getblocks(fd) / sb.bucket_size;
sb.nr_in_set = 1;
sb.first_bucket = (23 / sb.bucket_size) + 1;
if (sb.nbuckets < 1 << 7) {
fprintf(stderr, "Not enough buckets: %ju, need %u\n",
sb.nbuckets, 1 << 7);
exit(EXIT_FAILURE);
}
SET_CACHE_DISCARD(&sb, discard);
SET_CACHE_REPLACEMENT(&sb, cache_replacement_policy);
printf("UUID: %s\n"
"Set UUID: %s\n"
"version: %u\n"
"nbuckets: %ju\n"
"block_size: %u\n"
"bucket_size: %u\n"
"nr_in_set: %u\n"
"nr_this_dev: %u\n"
"first_bucket: %u\n",
uuid_str, set_uuid_str,
(unsigned) sb.version,
sb.nbuckets,
sb.block_size,
sb.bucket_size,
sb.nr_in_set,
sb.nr_this_dev,
sb.first_bucket);
}
sb.csum = csum_set(&sb);
/* Zero start of disk */
if (pwrite(fd, zeroes, SB_START, 0) != SB_START) {
perror("write error\n");
exit(EXIT_FAILURE);
}
/* Write superblock */
if (pwrite(fd, &sb, sizeof(sb), SB_START) != sizeof(sb)) {
perror("write error\n");
exit(EXIT_FAILURE);
}
fsync(fd);
close(fd);
}
static unsigned get_blocksize(const char *path)
{
struct stat statbuf;
if (stat(path, &statbuf)) {
fprintf(stderr, "Error statting %s: %s\n",
path, strerror(errno));
exit(EXIT_FAILURE);
}
if (S_ISBLK(statbuf.st_mode)) {
/* check IO limits:
* BLKALIGNOFF: alignment_offset
* BLKPBSZGET: physical_block_size
* BLKSSZGET: logical_block_size
* BLKIOMIN: minimum_io_size
* BLKIOOPT: optimal_io_size
*
* It may be tempting to use physical_block_size,
* or even minimum_io_size.
* But to be as transparent as possible,
* we want to use logical_block_size.
*/
unsigned int logical_block_size;
int fd = open(path, O_RDONLY);
if (fd < 0) {
fprintf(stderr, "open(%s) failed: %m\n", path);
exit(EXIT_FAILURE);
}
if (ioctl(fd, BLKSSZGET, &logical_block_size)) {
fprintf(stderr, "ioctl(%s, BLKSSZGET) failed: %m\n", path);
exit(EXIT_FAILURE);
}
close(fd);
return logical_block_size / 512;
}
/* else: not a block device.
* Why would we even want to write a bcache super block there? */
return statbuf.st_blksize / 512;
}
int main(int argc, char **argv)
{
int c, bdev = -1;
unsigned i, ncache_devices = 0, nbacking_devices = 0;
char *cache_devices[argc];
char *backing_devices[argc];
unsigned block_size = 0, bucket_size = 1024;
int writeback = 0, discard = 0, wipe_bcache = 0;
unsigned cache_replacement_policy = 0;
uint64_t data_offset = BDEV_DATA_START_DEFAULT;
uuid_t set_uuid;
uuid_generate(set_uuid);
struct option opts[] = {
{ "cache", 0, NULL, 'C' },
{ "bdev", 0, NULL, 'B' },
{ "bucket", 1, NULL, 'b' },
{ "block", 1, NULL, 'w' },
{ "writeback", 0, &writeback, 1 },
{ "wipe-bcache", 0, &wipe_bcache, 1 },
{ "discard", 0, &discard, 1 },
{ "cache_replacement_policy", 1, NULL, 'p' },
{ "data_offset", 1, NULL, 'o' },
{ "cset-uuid", 1, NULL, 'u' },
{ "help", 0, NULL, 'h' },
{ NULL, 0, NULL, 0 },
};
while ((c = getopt_long(argc, argv,
"-hCBU:w:b:",
opts, NULL)) != -1)
switch (c) {
case 'C':
bdev = 0;
break;
case 'B':
bdev = 1;
break;
case 'b':
bucket_size = hatoi_validate(optarg, "bucket size");
break;
case 'w':
block_size = hatoi_validate(optarg, "block size");
break;
#if 0
case 'U':
if (uuid_parse(optarg, sb.uuid)) {
fprintf(stderr, "Bad uuid\n");
exit(EXIT_FAILURE);
}
break;
#endif
case 'p':
cache_replacement_policy = read_string_list(optarg,
cache_replacement_policies);
break;
case 'o':
data_offset = atoll(optarg);
if (data_offset < BDEV_DATA_START_DEFAULT) {
fprintf(stderr, "Bad data offset; minimum %d sectors\n",
BDEV_DATA_START_DEFAULT);
exit(EXIT_FAILURE);
}
break;
case 'u':
if (uuid_parse(optarg, set_uuid)) {
fprintf(stderr, "Bad uuid\n");
exit(EXIT_FAILURE);
}
break;
case 'h':
usage();
break;
case 1:
if (bdev == -1) {
fprintf(stderr, "Please specify -C or -B\n");
exit(EXIT_FAILURE);
}
if (bdev)
backing_devices[nbacking_devices++] = optarg;
else
cache_devices[ncache_devices++] = optarg;
break;
}
if (!ncache_devices && !nbacking_devices) {
fprintf(stderr, "Please supply a device\n");
usage();
}
if (bucket_size < block_size) {
fprintf(stderr, "Bucket size cannot be smaller than block size\n");
exit(EXIT_FAILURE);
}
if (!block_size) {
for (i = 0; i < ncache_devices; i++)
block_size = max(block_size,
get_blocksize(cache_devices[i]));
for (i = 0; i < nbacking_devices; i++)
block_size = max(block_size,
get_blocksize(backing_devices[i]));
}
for (i = 0; i < ncache_devices; i++)
write_sb(cache_devices[i], block_size, bucket_size,
writeback, discard, wipe_bcache,
cache_replacement_policy,
data_offset, set_uuid, false);
for (i = 0; i < nbacking_devices; i++)
write_sb(backing_devices[i], block_size, bucket_size,
writeback, discard, wipe_bcache,
cache_replacement_policy,
data_offset, set_uuid, true);
return 0;
}
bcache-tools/probe-bcache.8 0000644 0000000 0000000 00000000736 12225757524 0016043 0 ustar 00root root 0000000 0000000 .TH probe-bcache 8
.SH NAME
probe-bcache \- probe a bcache device
.SH SYNOPSIS
.B probe-bcache
[\fB \-o\ \fIudev\fR ]
.I device
.SH OPTIONS
.TP
.BR \-o
return UUID in udev style for invocation by udev rule as IMPORT{program}
.SH USAGE
Return UUID if device identified as bcache-formatted.
Only necessary until support for the bcache superblock is included
in blkid; in the meantime, provides just enough functionality for a udev script
to create the /dev/disk/by-uuid symlink.
bcache-tools/probe-bcache.c 0000644 0000000 0000000 00000003141 12225757524 0016107 0 ustar 00root root 0000000 0000000 /*
* Author: Kent Overstreet <kmo@daterainc.com>
*
* GPLv2
*/
#define _FILE_OFFSET_BITS 64
#define __USE_FILE_OFFSET64
#define _XOPEN_SOURCE 500
#include <blkid.h>
#include <fcntl.h>
#include <linux/fs.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <uuid/uuid.h>
#include "bcache.h"
int main(int argc, char **argv)
{
bool udev = false;
int i, o;
extern char *optarg;
struct cache_sb sb;
char uuid[40];
blkid_probe pr;
while ((o = getopt(argc, argv, "o:")) != EOF)
switch (o) {
case 'o':
if (strcmp("udev", optarg)) {
printf("Invalid output format %s\n", optarg);
exit(EXIT_FAILURE);
}
udev = true;
break;
}
argv += optind;
argc -= optind;
for (i = 0; i < argc; i++) {
int fd = open(argv[i], O_RDONLY);
if (fd == -1)
continue;
if (!(pr = blkid_new_probe()))
continue;
if (blkid_probe_set_device(pr, fd, 0, 0))
continue;
/* probe partitions too */
if (blkid_probe_enable_partitions(pr, true))
continue;
/* bail if anything was found
* probe-bcache isn't needed once blkid recognizes bcache */
if (!blkid_do_probe(pr)) {
continue;
}
if (pread(fd, &sb, sizeof(sb), SB_START) != sizeof(sb))
continue;
if (memcmp(sb.magic, bcache_magic, 16))
continue;
uuid_unparse(sb.uuid, uuid);
if (udev)
printf("ID_FS_UUID=%s\n"
"ID_FS_UUID_ENC=%s\n"
"ID_FS_TYPE=bcache\n",
uuid, uuid);
else
printf("%s: UUID=\"\" TYPE=\"bcache\"\n", uuid);
}
return 0;
}