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manual merge

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Change-Id: I75355d4671c46edbb2a6a64a7a8b6217d02d4c12
This commit is contained in:
Claudio Fleiner 2014-12-08 00:57:16 -08:00
commit 06a26b58fe
9 changed files with 1675 additions and 490 deletions

36
Makefile.am
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@ -2,34 +2,43 @@
AUTOMAKE_OPTIONS=subdir-objects
PREFIX=/usr
AM_CFLAGS=-O2 -Wall -g -std=gnu99
AM_CFLAGS=-std=gnu99 `pkg-config --cflags uuid blkid`
AM_LDFLAGS=`pkg-config --libs uuid blkid` -L$(top_builddir)
bin_PROGRAMS=make-bcache \
probe-bcache \
bcache-super-show \
bcachectl
bcachectl \
bcacheadm
noinst_PROGRAMS=bcache-test
make_bcache_SOURCES=make-bcache.c bcache.c
make_bcache_LDFLAGS=`pkg-config --libs uuid blkid`
make_bcache_CFLAGS=$(AM_CFLAGS) `pkg-config --cflags uuid blkid`
lib_LIBRARIES=libbcache.a
libbcache_a_SOURCES=bcache.c
bcache_LDADD=libbcache.a
probe_bcache_SOURCES=probe-bcache.c bcache.c
probe_bcache_LDFLAGS=`pkg-config --libs uuid blkid`
probe_bcache_CFLAGS=$(AM_CFLAGS) `pkg-config --cflags uuid blkid`
make_bcache_SOURCES=make-bcache.c
make_bcache_LDADD=libbcache.a
bcache_super_show_SOURCES=bcache-super-show.c bcache.c
bcache_super_show_LDFLAGS=`pkg-config --libs uuid`
bcache_super_show_CFLAGS=$(AM_CFLAGS) `pkg-config --cflags uuid`
probe_bcache_SOURCES=probe-bcache.c
probe_bcache_LDADD=libbcache.a
bcache_super_show_SOURCES=bcache-super-show.c
bcache_super_show_LDADD=libbcache.a
bcachectl_SOURCES=bcachectl.c
bcache_test_SOURCE=bcache-test.c
bcache_test_SOURCES=bcache-test.c
bcache_test_LDFLAGS=-lm `pkg-config --libs openssl`
bcache_test_CFLAGS=$(AM_CFLAGS) `pkg-config --cflags openssl`
bcacheadm_SOURCES=bcacheadm.c
bcacheadm_CFLAGS=$(AM_CFLAGS) -g
bcacheadm_LDFLAGS=$(AM_LDFLAGS) -lnih
bcacheadm_LDADD=libbcache.a
udevrule_DATA=69-bcache.rules
udevruledir=$(prefix)/lib/udev/rules.d
@ -41,7 +50,8 @@ initramfsdir=$(prefix)/etc/initramfs-tools/hooks/
man8_MANS= bcache-super-show.8 \
make-bcache.8 \
probe-bcache.8
probe-bcache.8 \
bcacheadm.8
include ../../../../../../../../../../usr/share/DateraContainer/Makefile.rpm
# some version of automake don't like absolute path names for included makefiles

164
bcache-super-show.c
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@ -27,174 +27,18 @@
#include "bcache.h"
static bool force_csum = false;
static void usage()
void usage()
{
fprintf(stderr, "Usage: bcache-super-show [-f] <device>\n");
}
static void print_encode(char *in)
{
for (char *pos = in; *pos; pos++)
if (isalnum(*pos) || strchr(".-_", *pos))
putchar(*pos);
else
printf("%%%x", *pos);
}
static void show_super_common(struct cache_sb *sb)
{
char uuid[40];
char label[SB_LABEL_SIZE + 1];
uint64_t expected_csum;
printf("sb.magic\t\t");
if (!memcmp(&sb->magic, &BCACHE_MAGIC, sizeof(sb->magic))) {
printf("ok\n");
} else {
printf("bad magic\n");
fprintf(stderr, "Invalid superblock (bad magic)\n");
exit(2);
}
printf("sb.first_sector\t\t%ju", (uint64_t) 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%ju", (uint64_t) sb->csum);
expected_csum = csum_set(sb,
sb->version < BCACHE_SB_VERSION_CDEV_V3
? BCH_CSUM_CRC64
: CACHE_SB_CSUM_TYPE(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%ju", (uint64_t) 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?
exit(EXIT_SUCCESS);
}
putchar('\n');
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.b, uuid);
printf("dev.uuid\t\t%s\n", uuid);
uuid_unparse(sb->set_uuid.b, uuid);
printf("cset.uuid\t\t%s\n", uuid);
}
static void show_super_backingdev(struct cache_sb *sb)
{
uint64_t first_sector;
show_super_common(sb);
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%s"
"dev.data.cache_state\t%s\n",
first_sector,
bdev_cache_mode[BDEV_CACHE_MODE(sb)],
bdev_state[BDEV_STATE(sb)]);
}
static void show_cache_member(struct cache_sb *sb, unsigned i)
{
struct cache_member *m = ((struct cache_member *) sb->d) + i;
printf("cache.state\t%s\n", cache_state[CACHE_STATE(m)]);
printf("cache.tier\t%llu\n", CACHE_TIER(m));
printf("cache.replication_set\t%llu\n", CACHE_REPLICATION_SET(m));
printf("cache.cur_meta_replicas\t%llu\n", REPLICATION_SET_CUR_META_REPLICAS(m));
printf("cache.cur_data_replicas\t%llu\n", REPLICATION_SET_CUR_DATA_REPLICAS(m));
printf("cache.has_metadata\t%llu\n", CACHE_HAS_METADATA(m));
printf("cache.has_data\t%llu\n", CACHE_HAS_DATA(m));
printf("cache.replacement\t%s\n", replacement_policies[CACHE_REPLACEMENT(m)]);
printf("cache.discard\t%llu\n", CACHE_DISCARD(m));
}
static void show_super_cache(struct cache_sb *sb)
{
show_super_common(sb);
printf("dev.sectors_per_block\t%u\n"
"dev.sectors_per_bucket\t%u\n",
sb->block_size,
sb->bucket_size);
// total_sectors includes the superblock;
printf("dev.cache.first_sector\t%u\n"
"dev.cache.cache_sectors\t%llu\n"
"dev.cache.total_sectors\t%llu\n"
"dev.cache.ordered\t%s\n"
"dev.cache.pos\t\t%u\n"
"dev.cache.setsize\t\t%u\n",
sb->bucket_size * sb->first_bucket,
sb->bucket_size * (sb->nbuckets - sb->first_bucket),
sb->bucket_size * sb->nbuckets,
CACHE_SYNC(sb) ? "yes" : "no",
sb->nr_this_dev,
sb->nr_in_set);
show_cache_member(sb, sb->nr_this_dev);
}
int main(int argc, char **argv)
{
int o;
extern char *optarg;
struct cache_sb sb_stack, *sb = &sb_stack;
size_t bytes = sizeof(*sb);
bool force_csum = false;
while ((o = getopt(argc, argv, "f")) != EOF)
switch (o) {
@ -237,9 +81,9 @@ int main(int argc, char **argv)
}
if (!SB_IS_BDEV(sb))
show_super_cache(sb);
show_super_cache(sb, force_csum);
else
show_super_backingdev(sb);
show_super_backingdev(sb, force_csum);
return 0;
}

2
bcache-tools.spec
View File

@ -7,7 +7,7 @@ License: GPL
Group: tools
BuildRoot: %{_tmppath}/%{name}-root
Requires: libblkid
BuildRequires: pkgconfig libblkid-devel linux-headers
BuildRequires: pkgconfig libblkid-devel linux-headers libnih-devel
Summary: tools to manage bcache

877
bcache.c
View File

@ -5,10 +5,27 @@
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <fcntl.h>
#include <inttypes.h>
#include <getopt.h>
#include <limits.h>
#include <linux/fs.h>
#include <stdbool.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <dirent.h>
#include <unistd.h>
#include <uuid/uuid.h>
#include <blkid.h>
#include "bcache.h"
#define __KERNEL__
#include <linux/bcache-ioctl.h>
#undef __KERNEL__
const char * const cache_state[] = {
"active",
"ro",
@ -351,3 +368,863 @@ uint64_t bch_checksum(unsigned type, const void *data, size_t len)
return crc ^ 0xffffffffffffffffULL;
}
uint64_t getblocks(int fd)
{
uint64_t ret;
struct stat statbuf;
if (fstat(fd, &statbuf)) {
perror("getblocks: 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 getting blksize");
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;
}
static void do_write_sb(int fd, struct cache_sb *sb)
{
char zeroes[SB_START] = {0};
size_t bytes = ((void *) bset_bkey_last(sb)) - (void *) sb;
/* Zero start of disk */
if (pwrite(fd, zeroes, SB_START, 0) != SB_START) {
perror("write error trying to zero start of disk\n");
exit(EXIT_FAILURE);
}
/* Write superblock */
if (pwrite(fd, sb, bytes, SB_START) != bytes) {
perror("write error trying to write superblock\n");
exit(EXIT_FAILURE);
}
fsync(fd);
close(fd);
}
void write_backingdev_sb(int fd, unsigned block_size, unsigned *bucket_sizes,
bool writeback, uint64_t data_offset,
const char *label,
uuid_le set_uuid)
{
char uuid_str[40], set_uuid_str[40];
struct cache_sb sb;
memset(&sb, 0, sizeof(struct cache_sb));
sb.offset = SB_SECTOR;
sb.version = BCACHE_SB_VERSION_BDEV;
sb.magic = BCACHE_MAGIC;
uuid_generate(sb.uuid.b);
sb.set_uuid = set_uuid;
sb.bucket_size = bucket_sizes[0];
sb.block_size = block_size;
uuid_unparse(sb.uuid.b, uuid_str);
uuid_unparse(sb.set_uuid.b, set_uuid_str);
if (label)
memcpy(sb.label, label, SB_LABEL_SIZE);
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;
}
sb.csum = csum_set(&sb, BCH_CSUM_CRC64);
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);
do_write_sb(fd, &sb);
}
int dev_open(const char *dev, bool wipe_bcache)
{
struct cache_sb sb;
blkid_probe pr;
int fd;
char err[MAX_PATH];
if ((fd = open(dev, O_RDWR|O_EXCL)) == -1) {
sprintf(err, "Can't open dev %s: %s\n", dev, strerror(errno));
goto err;
}
if (pread(fd, &sb, sizeof(sb), SB_START) != sizeof(sb)) {
sprintf(err, "Failed to read superblock");
goto err;
}
if (!memcmp(&sb.magic, &BCACHE_MAGIC, 16) && !wipe_bcache) {
sprintf(err, "Already a bcache device on %s, "
"overwrite with --wipe-bcache\n", dev);
goto err;
}
if (!(pr = blkid_new_probe())) {
sprintf(err, "Failed to create a new probe");
goto err;
}
if (blkid_probe_set_device(pr, fd, 0, 0)) {
sprintf(err, "failed to set probe to device");
goto err;
}
/* enable ptable probing; superblock probing is enabled by default */
if (blkid_probe_enable_partitions(pr, true)) {
sprintf(err, "Failed to enable partitions on probe");
goto err;
}
if (!blkid_do_probe(pr)) {
/* XXX wipefs doesn't know how to remove partition tables */
sprintf(err, "Device %s already has a non-bcache superblock, "
"remove it using wipefs and wipefs -a\n", dev);
goto err;
}
return fd;
err:
fprintf(stderr, "dev_open failed with: %s", err);
exit(EXIT_FAILURE);
}
static unsigned min_bucket_size(int num_bucket_sizes, unsigned *bucket_sizes)
{
int i;
unsigned min = bucket_sizes[0];
for (i = 0; i < num_bucket_sizes; i++)
min = bucket_sizes[i] < min ? bucket_sizes[i] : min;
return min;
}
static unsigned node_size(unsigned bucket_size) {
if (bucket_size <= 256)
return bucket_size;
else if (bucket_size <= 512)
return bucket_size / 2;
else
return bucket_size / 4;
}
void write_cache_sbs(int *fds, struct cache_sb *sb,
unsigned block_size, unsigned *bucket_sizes,
int num_bucket_sizes)
{
char uuid_str[40], set_uuid_str[40];
size_t i;
unsigned min_size = min_bucket_size(num_bucket_sizes, bucket_sizes);
sb->offset = SB_SECTOR;
sb->version = BCACHE_SB_VERSION_CDEV_V3;
sb->magic = BCACHE_MAGIC;
sb->block_size = block_size;
sb->keys = bch_journal_buckets_offset(sb);
/*
* don't have a userspace crc32c implementation handy, just always use
* crc64
*/
SET_CACHE_SB_CSUM_TYPE(sb, BCH_CSUM_CRC64);
for (i = 0; i < sb->nr_in_set; i++) {
struct cache_member *m = sb->members + i;
if (num_bucket_sizes <= 1)
sb->bucket_size = bucket_sizes[0];
else
sb->bucket_size = bucket_sizes[i];
SET_CACHE_BTREE_NODE_SIZE(sb, node_size(min_size));
sb->uuid = m->uuid;
sb->nbuckets = getblocks(fds[i]) / sb->bucket_size;
sb->nr_this_dev = i;
sb->first_bucket = (23 / sb->bucket_size) + 1;
if (sb->nbuckets < 1 << 7) {
fprintf(stderr, "Not enough buckets: %llu, need %u\n",
sb->nbuckets, 1 << 7);
exit(EXIT_FAILURE);
}
sb->csum = csum_set(sb, CACHE_SB_CSUM_TYPE(sb));
uuid_unparse(sb->uuid.b, uuid_str);
uuid_unparse(sb->set_uuid.b, set_uuid_str);
printf("UUID: %s\n"
"Set UUID: %s\n"
"version: %u\n"
"nbuckets: %llu\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);
do_write_sb(fds[i], sb);
}
}
void next_cache_device(struct cache_sb *sb,
unsigned replication_set,
int tier,
unsigned replacement_policy,
bool discard)
{
struct cache_member *m = sb->members + sb->nr_in_set;
SET_CACHE_REPLICATION_SET(m, replication_set);
SET_CACHE_TIER(m, tier);
SET_CACHE_REPLACEMENT(m, replacement_policy);
SET_CACHE_DISCARD(m, discard);
uuid_generate(m->uuid.b);
sb->nr_in_set++;
}
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;
}
long strtoul_or_die(const char *p, size_t max, const char *msg)
{
errno = 0;
long v = strtol(p, NULL, 10);
if (errno || v < 0 || v >= max) {
fprintf(stderr, "Invalid %s %zi\n", msg, v);
exit(EXIT_FAILURE);
}
return v;
}
static void print_encode(char *in)
{
char *pos;
for (pos = in; *pos; pos++)
if (isalnum(*pos) || strchr(".-_", *pos))
putchar(*pos);
else
printf("%%%x", *pos);
}
static void show_uuid_only(struct cache_sb *sb, char *dev_uuid) {
uuid_unparse(sb->uuid.b, dev_uuid);
}
static void show_super_common(struct cache_sb *sb, bool force_csum)
{
char uuid[40];
char label[SB_LABEL_SIZE + 1];
uint64_t expected_csum;
printf("sb.magic\t\t");
if (!memcmp(&sb->magic, &BCACHE_MAGIC, sizeof(sb->magic))) {
printf("ok\n");
} else {
printf("bad magic\n");
fprintf(stderr, "Invalid superblock (bad magic)\n");
exit(2);
}
printf("sb.first_sector\t\t%ju", (uint64_t) 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%ju", (uint64_t) sb->csum);
expected_csum = csum_set(sb,
sb->version < BCACHE_SB_VERSION_CDEV_V3
? BCH_CSUM_CRC64
: CACHE_SB_CSUM_TYPE(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%ju", (uint64_t) 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?
exit(EXIT_SUCCESS);
}
putchar('\n');
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.b, uuid);
printf("dev.uuid\t\t%s\n", uuid);
uuid_unparse(sb->set_uuid.b, uuid);
printf("cset.uuid\t\t%s\n", uuid);
}
void show_super_backingdev(struct cache_sb *sb, bool force_csum)
{
uint64_t first_sector;
show_super_common(sb, force_csum);
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%s"
"dev.data.cache_state\t%s\n",
first_sector,
bdev_cache_mode[BDEV_CACHE_MODE(sb)],
bdev_state[BDEV_STATE(sb)]);
}
static void show_cache_member(struct cache_sb *sb, unsigned i)
{
struct cache_member *m = ((struct cache_member *) sb->d) + i;
printf("cache.state\t%s\n", cache_state[CACHE_STATE(m)]);
printf("cache.tier\t%llu\n", CACHE_TIER(m));
printf("cache.replication_set\t%llu\n", CACHE_REPLICATION_SET(m));
printf("cache.cur_meta_replicas\t%llu\n", REPLICATION_SET_CUR_META_REPLICAS(m));
printf("cache.cur_data_replicas\t%llu\n", REPLICATION_SET_CUR_DATA_REPLICAS(m));
printf("cache.has_metadata\t%llu\n", CACHE_HAS_METADATA(m));
printf("cache.has_data\t%llu\n", CACHE_HAS_DATA(m));
printf("cache.replacement\t%s\n", replacement_policies[CACHE_REPLACEMENT(m)]);
printf("cache.discard\t%llu\n", CACHE_DISCARD(m));
}
void show_super_cache(struct cache_sb *sb, bool force_csum)
{
show_super_common(sb, force_csum);
printf("dev.sectors_per_block\t%u\n"
"dev.sectors_per_bucket\t%u\n",
sb->block_size,
sb->bucket_size);
// total_sectors includes the superblock;
printf("dev.cache.first_sector\t%u\n"
"dev.cache.cache_sectors\t%llu\n"
"dev.cache.total_sectors\t%llu\n"
"dev.cache.ordered\t%s\n"
"dev.cache.pos\t\t%u\n"
"dev.cache.setsize\t\t%u\n",
sb->bucket_size * sb->first_bucket,
sb->bucket_size * (sb->nbuckets - sb->first_bucket),
sb->bucket_size * sb->nbuckets,
CACHE_SYNC(sb) ? "yes" : "no",
sb->nr_this_dev,
sb->nr_in_set);
show_cache_member(sb, sb->nr_this_dev);
}
struct cache_sb *query_dev(char *dev, bool force_csum,
bool print_sb, bool uuid_only, char *dev_uuid)
{
struct cache_sb sb_stack, *sb = &sb_stack;
size_t bytes = sizeof(*sb);
int fd = open(dev, O_RDONLY);
if (fd < 0) {
printf("Can't open dev %s: %s\n", dev, strerror(errno));
exit(2);
}
if (pread(fd, sb, bytes, SB_START) != bytes) {
fprintf(stderr, "Couldn't read\n");
exit(2);
}
if (sb->keys) {
bytes = sizeof(*sb) + sb->keys * sizeof(uint64_t);
sb = malloc(bytes);
if (pread(fd, sb, bytes, SB_START) != bytes) {
fprintf(stderr, "Couldn't read\n");
exit(2);
}
}
if(uuid_only) {
show_uuid_only(sb, dev_uuid);
return sb;
}
if(print_sb) {
if (!SB_IS_BDEV(sb))
show_super_cache(sb, force_csum);
else
show_super_backingdev(sb, force_csum);
}
return sb;
}
static void dev_name(const char *ugly_path) {
char buf[32];
int i, end = strlen(ugly_path);
//Chop off "/bcache", then look for the next '/' from the end
for (i = end - 8; ; i--)
if(ugly_path[i] == '/')
break;
strcpy(buf, ugly_path + i);
buf[end - i - 7] = 0;
// Is the dev guaranteed to be in /dev?
// This is needed for finding the superblock with a query-dev
printf("/dev%s\n", buf);
}
static void list_cacheset_devs(char *cset_dir, char *cset_name, bool parse_dev_name) {
int i = 0;
DIR *cachedir;
struct stat cache_stat;
char intbuf[4];
char entry[MAX_PATH];
snprintf(entry, MAX_PATH, "%s/%s/cache0", cset_dir, cset_name);
snprintf(intbuf, 4, "%d", i);
while(true) {
char buf[MAX_PATH];
int len;
if((cachedir = opendir(entry)) == NULL)
break;
if(stat(entry, &cache_stat))
break;
if((len = readlink(entry, buf, sizeof(buf) - 1)) != -1) {
buf[len] = '\0';
if(parse_dev_name)
dev_name(buf);
else
printf("\t%s\n", buf);
}
/* remove i from end and append i++ */
entry[strlen(entry)-strlen(intbuf)] = 0;
i++;
snprintf(intbuf, 4, "%d", i);
strcat(entry, intbuf);
}
}
char *find_matching_uuid(char *stats_dir, char *subdir, const char *stats_dev_uuid) {
/* Do a query-dev --uuid only to get the uuid
* repeat on each dev until we find a matching one
* append that cache# to subdir and return
*/
int i = 0;
DIR *cachedir;
struct stat cache_stat;
char intbuf[4];
char entry[MAX_PATH];
char *err = NULL;
snprintf(entry, MAX_PATH, "%s%s", stats_dir, subdir);
snprintf(intbuf, 4, "%d", i);
strcat(entry, intbuf);
while(true) {
char buf[MAX_PATH];
int len;
if((cachedir = opendir(entry)) == NULL)
break;
if(stat(entry, &cache_stat))
break;
if((len = readlink(entry, buf, sizeof(buf) - 1)) != -1) {
char dev_uuid[40];
buf[len] = '\0';
int i, end = strlen(buf);
char tmp[32], devname[32];
/* Chop off "/bcache", then look for the
* next '/' from the end
*/
for (i = end - 8; ; i--)
if(buf[i] == '/')
break;
strcpy(tmp, buf + i);
tmp[end - i - 7] = 0;
strcpy(devname, "/dev");
strcat(devname, tmp);
query_dev(devname, false, false, true, dev_uuid);
if(!strcmp(stats_dev_uuid, dev_uuid)) {
strcat(subdir, intbuf);
return err;
}
}
/* remove i from end and append i++ */
entry[strlen(entry)-strlen(intbuf)] = 0;
i++;
snprintf(intbuf, 4, "%d", i);
strcat(entry, intbuf);
}
err = "dev uuid doesn't exist in cache_set";
return err;
}
char *list_cachesets(char *cset_dir, bool list_devs)
{
struct dirent *ent;
DIR *dir;
char *err = NULL;
dir = opendir(cset_dir);
if (!dir) {
err = "Failed to open cacheset dir";
goto err;
}
while ((ent = readdir(dir)) != NULL) {
struct stat statbuf;
char entry[MAX_PATH];
struct dirent *cache_ent;
if (!strcmp(ent->d_name, ".") || !strcmp(ent->d_name, ".."))
continue;
snprintf(entry, MAX_PATH, "%s/%s", cset_dir, ent->d_name);
if(stat(entry, &statbuf) == -1) {
err = "Failed to stat cacheset subdir";
goto err;
}
if (S_ISDIR(statbuf.st_mode)) {
printf("%s\n", ent->d_name);
if(list_devs) {
list_cacheset_devs(cset_dir, ent->d_name, true);
}
}
}
err:
closedir(dir);
return err;
}
char *register_bcache(char *const *devs)
{
int ret, bcachefd;
char *err = NULL;
bcachefd = open("/dev/bcache", O_RDWR);
if (bcachefd < 0) {
err = "Can't open bcache device";
goto err;
}
ret = ioctl(bcachefd, BCH_IOCTL_REGISTER, devs);
if (ret < 0) {
char tmp[64];
snprintf(tmp, 64, "ioctl register error: %s\n",
strerror(ret));
err = strdup(tmp);
goto err;
}
err:
if (bcachefd)
close(bcachefd);
return err;
}
char *unregister_bcache(char *const *devs)
{
int ret, bcachefd;
char *err = NULL;
bcachefd = open("/dev/bcache", O_RDWR);
if (bcachefd < 0) {
err = "Can't open bcache device";
goto err;
}
ret = ioctl(bcachefd, BCH_IOCTL_UNREGISTER, devs);
if (ret < 0) {
char tmp[64];
snprintf(tmp, 64, "ioctl unregister error: %s\n",
strerror(ret));
err = strdup(tmp);
goto err;
}
err:
close(bcachefd);
return err;
}
char *probe(char *dev, int udev)
{
struct cache_sb sb;
char uuid[40];
blkid_probe pr;
char *err = NULL;
int fd = open(dev, O_RDONLY);
if (fd == -1) {
err = "Got file descriptor -1 trying to open dev";
goto err;
}
if (!(pr = blkid_new_probe())) {
err = "Failed trying to get a blkid for new probe";
goto err;
}
if (blkid_probe_set_device(pr, fd, 0, 0)) {
err = "Failed blkid probe set device";
goto err;
}
/* probe partitions too */
if (blkid_probe_enable_partitions(pr, true)) {
err = "Enable probe partitions";
goto err;
}
/* bail if anything was found
* probe-bcache isn't needed once blkid recognizes bcache */
if (!blkid_do_probe(pr)) {
err = "blkid recognizes bcache";
goto err;
}
if (pread(fd, &sb, sizeof(sb), SB_START) != sizeof(sb)) {
err = "Failed to read superblock";
goto err;
}
if (memcmp(&sb.magic, &BCACHE_MAGIC, sizeof(sb.magic))) {
err = "Bcache magic incorrect";
goto err;
}
uuid_unparse(sb.uuid.b, 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;
err:
return err;
}
void sb_state(struct cache_sb *sb, char *dev)
{
struct cache_member *m = ((struct cache_member *) sb->d) +
sb->nr_this_dev;
printf("device %s\n", dev);
printf("\tcache state\t%s\n", cache_state[CACHE_STATE(m)]);
printf("\tcache_tier\t%llu\n", CACHE_TIER(m));
printf("\tseq#: \t%llu\n", sb->seq);
}
char *read_stat_dir(DIR *dir, char *stats_dir, char *stat_name, bool print_val)
{
struct stat statbuf;
char entry[MAX_PATH];
char *err = NULL;
snprintf(entry, MAX_PATH, "%s/%s", stats_dir, stat_name);
if(stat(entry, &statbuf) == -1) {
char tmp[MAX_PATH];
snprintf(tmp, MAX_PATH, "Failed to stat %s\n", entry);
err = strdup(tmp);
goto err;
}
if (S_ISREG(statbuf.st_mode)) {
char buf[MAX_PATH];
FILE *fp = NULL;
fp = fopen(entry, "r");
if(!fp) {
/* If we can't open the file, this is probably because
* of permissions, just move to the next file */
return NULL;
}
while(fgets(buf, MAX_PATH, fp));
if(print_val)
printf("%s\n", buf);
else
printf("%s\n", stat_name);
fclose(fp);
}
err:
return err;
}

36
bcache.h
View File

@ -8,6 +8,7 @@
#define _BCACHE_H
#include <linux/bcache.h>
#include <dirent.h>
typedef __u8 u8;
typedef __u16 u16;
@ -20,6 +21,15 @@ typedef __s32 s32;
typedef __s64 s64;
#define SB_START (SB_SECTOR * 512)
#define MAX_PATH 256
#define max(x, y) ({ \
typeof(x) _max1 = (x); \
typeof(y) _max2 = (y); \
(void) (&_max1 == &_max2); \
_max1 > _max2 ? _max1 : _max2; })
extern const char * const cache_state[];
extern const char * const replacement_policies[];
@ -34,6 +44,32 @@ void print_string_list(const char * const[], size_t);
uint64_t bch_checksum(unsigned, const void *, size_t);
uint64_t getblocks(int);
uint64_t hatoi(const char *);
unsigned hatoi_validate(const char *, const char *);
void write_backingdev_sb(int, unsigned, unsigned *, bool, uint64_t,
const char *, uuid_le);
int dev_open(const char *, bool);
void write_cache_sbs(int *, struct cache_sb *, unsigned, unsigned *, int);
void next_cache_device(struct cache_sb *, unsigned, int, unsigned, bool);
unsigned get_blocksize(const char *);
long strtoul_or_die(const char *, size_t, const char *);
void show_super_backingdev(struct cache_sb *, bool);
void show_super_cache(struct cache_sb *, bool);
struct cache_sb *query_dev(char *, bool, bool, bool, char *dev_uuid);
char *list_cachesets(char *, bool);
char *parse_array_to_list(char *const *);
char *register_bcache(char *const *);
char *unregister_bcache(char *const *);
char *probe(char *, int);
void sb_state(struct cache_sb *, char *);
char *read_stat_dir(DIR *, char *, char *, bool);
char *find_matching_uuid(char *, char *, const char*);
//int add_device(char *);
//int remove_device(char *);
#define csum_set(i, type) \
({ \
void *start = ((void *) (i)) + sizeof(uint64_t); \

151
bcacheadm.8 Normal file
View File

@ -0,0 +1,151 @@
.TH bcacheadm 8
.SH NAME
bcacheadm \- manage bcache devices
.SH SYNOPSIS
.B bcacheadm
[\fIoptions\fR]
.B COMMAND
[\fIoptions\fR]
.SH COMMANDS
.TP
.BR format
.RS
Format one or a list of devices with bcache data structures. You need to do this before you create a volume.
.RE
.BR register
.RS
Register a list of devices.
.RE
.BR list-cachesets
.RS
List cachesets on this system. This just searches /sys/fs/bcache.
.RE
.BR query-devs
.RS
Gives info about the superblock for a list of devices.
.RE
.BR status
.RS
Finds the status of the most up to date superblock in each tier. Pass in a list of devices.
.RE
.BR stats
.RS
List bcache specific statistics. Use --list to find out exactly what these are. To list stats for a cacheset, just give the cacheset uuid. To target a cache within the cacheset, use the -c option. To get time interval stats, use the hour, day, etc, options.
.RE
.BR probe
.RS
Return UUID if device identified as bcache-formatted.
.PP
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.
.RE
.BR help
.RS
List the bcacheadm commands
.RE
.SH OPTIONS
.SH Options for bcacheadm
.TP
.BR \--help
.SH Options for format
.TP
.BR \-C
Create a cache
.TP
.BR \-B
Create a backing device
.TP
.BR \-b\ --bucket-size=
Specifies the bucket size.
.TP
.BR \-l\ --label=
label
.TP
.BR \-w,\ --block=
block size (hard sector size of SSD, often 2k
.TP
.BR \-t,\ --tier=
tier of subsequent devices
.TP
.BR \--cache-replacement-policy=
one of lru, fifo, or random
.TP
.BR \-o,\ --data_offset=
data offset in sectors
.TP
.BR \--cset-uuid=
Create a cache device with the specified UUID
.TP
.BR \--csum_type=
One of none, csc32c, or csc64
.TP
.BR \--meta-replicas=
Number of metadata replicas
.TP
.BR \--data-replicas=
Number of data replicas
.TP
.BR \--wipe-bcache
Destroy existing bcache data if present
.TP
.BR \--discard
Enable discards
.TP
.BR \--writeback
Enable writeback
.SH Options for register
.SH Options for list-cachesets
.TP
.BR \-d,\ --dir=
Provide a directory other than /sys/fs/bcache
.SH Options for query-devs
.TP
.BR \-f,\ --force-csum
Enables bcacheadm to going even if the superblock crc is invalid
.SH Options for status
.SH Options for stats
.TP
.BR \-a,\ --all
List all stats and their values for the given device.
.TP
.BR \-l,\ --list
List the names of the different stats for the given device.
.TP
.BR \-u,\ --set=
UUID for the cacheset
.TP
.BR \-d,\ --dev=
UUID for a device within the cacheset. Must pass in the cacheset UUID in order to search for a dev.
.TP
.BR \-c,\ --cache=
Cache number, starts from 0
.TP
.BR \--five-min-stats
stats accumulated in the last 5 minutes
.TP
.BR \--hour-stats
stats accumulated in the last hour
.TP
.BR \--day-stats
stats accumulated in the last day
.TP
.BR \--total-stats
stats accumulated in total

565
bcacheadm.c Normal file
View File

@ -0,0 +1,565 @@
/*
* Authors: Kent Overstreet <kmo@daterainc.com>
* Gabriel de Perthuis <g2p.code@gmail.com>
* Jacob Malevich <jam@datera.io>
*
* GPLv2
*/
#include <nih/option.h>
#include <nih/command.h>
#include <nih/main.h>
#include <nih/logging.h>
#include <stdlib.h>
#include <stdio.h>
#include <ctype.h>
#include <errno.h>
#include <inttypes.h>
#include <limits.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdbool.h>
#include <stdint.h>
#include <blkid.h>
#include <string.h>
#include <linux/fs.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <uuid/uuid.h>
#include <dirent.h>
#include <bcache.h> //libbcache
#define PACKAGE_NAME "bcacheadm"
#define PACKAGE_VERSION "1.0"
#define PACKAGE_BUGREPORT "bugreport"
#define MAX_DEVS MAX_CACHES_PER_SET
/* bcacheadm globals */
enum exit {
EXIT_OK = 0, /* Ok */
EXIT_ERROR = 1, /* General/OS error */
EXIT_SHELL = 2, /* Start maintenance shell */
EXIT_SHELL_REBOOT = 3, /* Start maintenance shell, reboot when done */
EXIT_REBOOT = 4, /* System must reboot */
};
/* make-bcache globals */
int bdev = -1;
int devs = 0;
char *cache_devices[MAX_DEVS];
int tier_mapping[MAX_DEVS];
char *backing_devices[MAX_DEVS];
char *backing_dev_labels[MAX_DEVS];
size_t i, nr_backing_devices = 0, nr_cache_devices = 0;
unsigned block_size = 0;
unsigned bucket_sizes[MAX_DEVS];
int num_bucket_sizes = 0;
int writeback = 0, discard = 0, wipe_bcache = 0;
unsigned replication_set = 0, replacement_policy = 0;
uint64_t data_offset = BDEV_DATA_START_DEFAULT;
char *label = NULL;
struct cache_sb *cache_set_sb = NULL;
enum long_opts {
CACHE_SET_UUID = 256,
CSUM_TYPE,
REPLICATION_SET,
META_REPLICAS,
DATA_REPLICAS,
};
const char *cache_set_uuid = 0;
const char *csum_type = 0;
char *metadata_replicas = 0;
char *data_replicas = 0;
char *tier = 0;
/* query-dev globals */
bool force_csum = false;
bool uuid_only = false;
/* probe globals */
bool udev = false;
/* list globals */
char *cset_dir = "/sys/fs/bcache";
bool list_devs = false;
/* status globals */
bool status_all = false;
/* stats globals */
bool stats_all = false;
bool stats_list = false;
static const char *stats_uuid = NULL;
static const char *stats_dev_uuid = NULL;
static const char *stats_cache_num = NULL;
bool stats_five_min = false;
bool stats_hour = false;
bool stats_day = false;
bool stats_total = false;
/* make-bcache option setters */
static int set_block_size(NihOption *option, const char *arg)
{
block_size = hatoi_validate(arg, "block size");
return 0;
}
static int set_cache(NihOption *option, const char *arg)
{
bdev = 0;
cache_devices[nr_cache_devices] = strdup(arg);
if(!tier)
tier_mapping[nr_cache_devices] = 0;
else {
int ntier = atoi(tier);
if(ntier == 0 || ntier == 1)
tier_mapping[nr_cache_devices] = ntier;
else
printf("Invalid tier\n");
}
devs++;
nr_cache_devices++;
}
static int set_bdev(NihOption *option, const char *arg)
{
bdev = 1;
if(label)
backing_dev_labels[nr_backing_devices] = strdup(label);
backing_devices[nr_backing_devices] = strdup(arg);
nr_backing_devices++;
devs++;
return 0;
}
static int set_bucket_sizes(NihOption *option, const char *arg)
{
bucket_sizes[num_bucket_sizes]=hatoi_validate(arg, "bucket size");
num_bucket_sizes++;
return 0;
}
/* probe setters */
static int set_udev(NihOption *option, const char *arg)
{
if (strcmp("udev", arg)) {
printf("Invalid output format %s\n", arg);
exit(EXIT_FAILURE);
}
udev = true;
return 0;
}
/* options */
static NihOption make_bcache_options[] = {
// {int shortoption, char* longoption, char* help, NihOptionGroup, char* argname, void *value, NihOptionSetter}
{'C', "cache", N_("Format a cache device"), NULL, "dev", NULL, set_cache},
{'B', "bdev", N_("Format a backing device"), NULL, "dev", NULL, set_bdev},
{'l', "label", N_("label"), NULL, "label", &label, NULL},
//Only one bucket_size supported until a list of bucket sizes is parsed correctly
{'b', "bucket", N_("bucket size"), NULL, "size", NULL, set_bucket_sizes},
//Does the default setter automatically convert strings to an int?
{'w', "block", N_("block size (hard sector size of SSD, often 2k"), NULL,"size", NULL, set_block_size},
{'t', "tier", N_("tier of subsequent devices"), NULL,"#", &tier, NULL},
{'p', "cache_replacement_policy", N_("one of (lru|fifo|random)"), NULL,"policy", &replacement_policy, NULL},
{'o', "data_offset", N_("data offset in sectors"), NULL,"offset", &data_offset, NULL},
{0, "cset-uuid", N_("UUID for the cache set"), NULL, "uuid", &cache_set_uuid, NULL},
{0, "csum-type", N_("One of (none|crc32c|crc64)"), NULL, "type", &csum_type, NULL },
{0, "replication-set",N_("replication set of subsequent devices"), NULL, NULL, &replication_set, NULL },
{0, "meta-replicas",N_("number of metadata replicas"), NULL, "#", &metadata_replicas, NULL},
{0, "data-replicas",N_("number of data replicas"), NULL, "#", &data_replicas, NULL },
{0, "wipe-bcache", N_("destroy existing bcache data if present"), NULL, NULL, &wipe_bcache, NULL},
{0, "discard", N_("enable discards"), NULL, NULL, &discard, NULL},
{0, "writeback", N_("enable writeback"), NULL, NULL, &writeback, NULL},
NIH_OPTION_LAST
};
static NihOption probe_bcache_options[] = {
{'o', "udev", N_("udev"), NULL, NULL, NULL, set_udev},
NIH_OPTION_LAST
};
static NihOption bcache_register_options[] = {
NIH_OPTION_LAST
};
static NihOption bcache_unregister_options[] = {
NIH_OPTION_LAST
};
static NihOption query_devs_options[] = {
{'f', "force_csum", N_("force_csum"), NULL, NULL, &force_csum, NULL},
{'u', "uuid-only", N_("only print out the uuid for the devices, not the whole superblock"), NULL, NULL, &uuid_only, NULL},
NIH_OPTION_LAST
};
static NihOption list_cachesets_options[] = {
{'d', "dir", N_("directory"), NULL, NULL, &cset_dir, NULL},
{0, "list-devs", N_("list all devices in the cache sets as well"), NULL, NULL, &list_devs, NULL},
NIH_OPTION_LAST
};
static NihOption status_options[] = {
{'a', "all", N_("all"), NULL, NULL, &status_all, NULL},
NIH_OPTION_LAST
};
static NihOption stats_options[] = {
{'a', "all", N_("all"), NULL, NULL, &stats_all, NULL},
{'l', "list", N_("list"), NULL, NULL, &stats_list, NULL},
{'u', "set", N_("cache_set UUID"), NULL, "UUID", &stats_uuid, NULL},
{'d', "dev", N_("dev UUID"), NULL, "UUID", &stats_dev_uuid, NULL},
{'c', "cache", N_("cache number (starts from 0)"), NULL, "CACHE#", &stats_cache_num, NULL},
{0, "five-min-stats", N_("stats accumulated in last 5 minutes"), NULL, NULL, &stats_five_min, NULL},
{0, "hour-stats", N_("stats accumulated in last hour"), NULL, NULL, &stats_hour, NULL},
{0, "day-stats", N_("stats accumulated in last day"), NULL, NULL, &stats_day, NULL},
{0, "total-stats", N_("stats accumulated in total"), NULL, NULL, &stats_total, NULL},
NIH_OPTION_LAST
};
static NihOption options[] = {
NIH_OPTION_LAST
};
/* commands */
int make_bcache(NihCommand *command, char *const *args)
{
int cache_dev_fd[devs];
int backing_dev_fd[devs];
cache_set_sb = calloc(1, sizeof(*cache_set_sb) +
sizeof(struct cache_member) * devs);
if (cache_set_uuid) {
if(uuid_parse(cache_set_uuid, cache_set_sb->set_uuid.b)) {
fprintf(stderr, "Bad uuid\n");
return -1;
}
} else {
uuid_generate(cache_set_sb->set_uuid.b);
}
if (csum_type) {
SET_CACHE_PREFERRED_CSUM_TYPE(cache_set_sb,
read_string_list_or_die(csum_type, csum_types,
"csum type"));
} else {
SET_CACHE_PREFERRED_CSUM_TYPE(cache_set_sb, BCH_CSUM_CRC32C);
}
if (metadata_replicas) {
SET_CACHE_SET_META_REPLICAS_WANT(cache_set_sb,
strtoul_or_die(metadata_replicas,
CACHE_SET_META_REPLICAS_WANT_MAX,
"meta replicas"));
} else {
SET_CACHE_SET_META_REPLICAS_WANT(cache_set_sb, 1);
}
if (data_replicas) {
SET_CACHE_SET_DATA_REPLICAS_WANT(cache_set_sb,
strtoul_or_die(data_replicas,
CACHE_SET_DATA_REPLICAS_WANT_MAX,
"data replicas"));
} else {
SET_CACHE_SET_DATA_REPLICAS_WANT(cache_set_sb, 1);
}
if (bdev == -1) {
fprintf(stderr, "Please specify -C or -B\n");
exit(EXIT_FAILURE);
}
if(!bucket_sizes[0]) bucket_sizes[0] = 1024;
for(i = 0; i < nr_cache_devices; i++)
next_cache_device(cache_set_sb,
replication_set,
tier_mapping[i],
replacement_policy,
discard);
if (!cache_set_sb->nr_in_set && !nr_backing_devices) {
fprintf(stderr, "Please supply a device\n");
exit(EXIT_FAILURE);
}
i = 0;
do {
if (bucket_sizes[i] < block_size) {
fprintf(stderr,
"Bucket size cannot be smaller than block size\n");
exit(EXIT_FAILURE);
}
i++;
} while (i < num_bucket_sizes);
if (!block_size) {
for (i = 0; i < cache_set_sb->nr_in_set; i++)
block_size = max(block_size,
get_blocksize(cache_devices[i]));
for (i = 0; i < nr_backing_devices; i++)
block_size = max(block_size,
get_blocksize(backing_devices[i]));
}
for (i = 0; i < cache_set_sb->nr_in_set; i++)
cache_dev_fd[i] = dev_open(cache_devices[i], wipe_bcache);
for (i = 0; i < nr_backing_devices; i++)
backing_dev_fd[i] = dev_open(backing_devices[i], wipe_bcache);
write_cache_sbs(cache_dev_fd, cache_set_sb, block_size,
bucket_sizes, num_bucket_sizes);
for (i = 0; i < nr_backing_devices; i++)
write_backingdev_sb(backing_dev_fd[i],
block_size, bucket_sizes,
writeback, data_offset,
backing_dev_labels[i],
cache_set_sb->set_uuid);
return 0;
}
int probe_bcache(NihCommand *command, char *const *args)
{
int i;
char *err = NULL;
for (i = 0; args[i] != NULL; i++) {
err = probe(args[i], udev);
if(err) {
printf("probe_bcache error: %s\n", err);
return -1;
}
}
return 0;
}
int bcache_register(NihCommand *command, char *const *args)
{
char *err = NULL;
err = register_bcache(args);
if (err) {
printf("bcache_register error: %s\n", err);
return -1;
}
return 0;
}
int bcache_unregister(NihCommand *command, char *const *args)
{
char *err = NULL;
err = unregister_bcache(args);
if (err) {
printf("bcache_unregister error: %s\n", err);
return -1;
}
return 0;
}
int bcache_list_cachesets(NihCommand *command, char *const *args)
{
char *err = NULL;
err = list_cachesets(cset_dir, list_devs);
if (err) {
printf("bcache_list_cachesets error :%s\n", err);
return -1;
}
return 0;
}
int bcache_query_devs(NihCommand *command, char *const *args)
{
int i;
for (i = 0; args[i] != NULL; i++){
char dev_uuid[40];
query_dev(args[i], force_csum, true, uuid_only, dev_uuid);
if(uuid_only)
printf("%s\n", dev_uuid);
}
}
int bcache_status(NihCommand *command, char *const *args)
{
int i;
struct cache_sb *sb_tier0 = NULL, *sb_tier1 = NULL;
char *dev0 = NULL, *dev1 = NULL;
for (i = 0; args[i] != NULL; i++) {
struct cache_sb *sb = query_dev(args[i], false, false, false, NULL);
struct cache_member *m = ((struct cache_member *) sb->d) +
sb->nr_this_dev;
long long unsigned cache_tier = CACHE_TIER(m);
if (!cache_tier)
if (!sb_tier0 || sb->seq > sb_tier0->seq) {
sb_tier0 = sb;
dev0 = args[i];
}
else if (cache_tier == 1)
if (!sb_tier1 || sb->seq > sb_tier1->seq) {
sb_tier1 = sb;
dev1 = args[i];
}
}
if (sb_tier0) sb_state(sb_tier0, dev0);
if (sb_tier1) sb_state(sb_tier1, dev1);
}
static char *stats_subdir(char* stats_dir)
{
char tmp[50] = "/";
char *err = NULL;
if(stats_dev_uuid) {
strcat(tmp, "cache");
err = find_matching_uuid(stats_dir, tmp, stats_dev_uuid);
if(err)
goto err;
} else if(stats_cache_num) {
strcat(tmp, "cache");
strcat(tmp, stats_cache_num);
} else if (stats_five_min)
strcat(tmp, "stats_five_minute");
else if (stats_hour)
strcat(tmp, "stats_hour");
else if (stats_day)
strcat(tmp, "stats_day");
else if (stats_total)
strcat(tmp, "stats_total");
else
return err;
strcat(stats_dir, tmp);
err:
return err;
}
int bcache_stats(NihCommand *command, char *const *args)
{
int i;
char stats_dir[MAX_PATH];
DIR *dir = NULL;
struct dirent *ent = NULL;
char *err = NULL;
if (stats_uuid) {
snprintf(stats_dir, MAX_PATH, "%s/%s", cset_dir, stats_uuid);
err = stats_subdir(stats_dir);
if(err)
goto err;
dir = opendir(stats_dir);
if (!dir) {
err = "Failed to open dir";
goto err;
}
} else {
err = "Must provide a cacheset uuid";
goto err;
}
if(stats_list || stats_all) {
while ((ent = readdir(dir)) != NULL) {
err = read_stat_dir(dir, stats_dir, ent->d_name, stats_all);
if (err)
goto err;
}
}
for (i = 0; args[i] != NULL; i++) {
err = read_stat_dir(dir, stats_dir, args[i], true);
if (err)
goto err;
}
closedir(dir);
return 0;
err:
closedir(dir);
printf("bcache_stats error: %s\n", err);
return -1;
}
static NihCommand commands[] = {
{"format", N_("format <list of drives>"),
"Format one or a list of devices with bcache datastructures."
" You need to do this before you create a volume",
N_("format drive[s] with bcache"),
NULL, make_bcache_options, make_bcache},
{"probe", N_("probe <list of devices>"),
"Does a blkid_probe on a device",
N_("Does a blkid_probe on a device"),
NULL, probe_bcache_options, probe_bcache},
{"register", N_("register <list of devices>"),
"Registers a list of devices",
N_("Registers a list of devices"),
NULL, bcache_register_options, bcache_register},
{"unregister", N_("unregister <list of devices>"),
"Unregisters a list of devices",
N_("Unregisters a list of devices"),
NULL, bcache_unregister_options, bcache_unregister},
{"list-cachesets", N_("list-cachesets"),
"Lists cachesets in /sys/fs/bcache",
N_("Lists cachesets in /sys/fs/bcache"),
NULL, list_cachesets_options, bcache_list_cachesets},
{"query-devs", N_("query <list of devices>"),
"Gives info about the superblock of a list of devices",
N_("show superblock on each of the listed drive"),
NULL, query_devs_options, bcache_query_devs},
{"status", N_("status <list of devices>"),
"Finds the status of the most up to date superblock",
N_("Finds the status of the most up to date superblock"),
NULL, status_options, bcache_status},
{"stats", N_("stats <list of devices>"),
"List various bcache statistics",
N_("List various bcache statistics"),
NULL, stats_options, bcache_stats},
NIH_COMMAND_LAST
};
int main(int argc, char *argv[])
{
int ret = 0;
nih_main_init (argv[0]);
nih_option_set_synopsis (_("Manage bcache devices"));
nih_option_set_help (
_("Helps you manage bcache devices"));
ret = nih_command_parser (NULL, argc, argv, options, commands);
if (ret < 0)
exit (1);
nih_signal_reset();
}

1
configure.ac
View File

@ -11,7 +11,6 @@ AC_CONFIG_MACRO_DIR([m4])
# Checks for programs.
AC_PROG_CC
# Checks for libraries.
# Checks for header files.

333
make-bcache.c
View File

@ -5,10 +5,9 @@
*/
#define _FILE_OFFSET_BITS 64
#define __USE_FILE_OFFSET64
#define __USE_FILE_OFFSET 64
#define _XOPEN_SOURCE 600
#include <blkid.h>
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
@ -28,74 +27,6 @@
#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;
}
void usage()
{
fprintf(stderr,
@ -123,249 +54,14 @@ void usage()
exit(EXIT_FAILURE);
}
static void do_write_sb(int fd, struct cache_sb *sb)
{
char zeroes[SB_START] = {0};
size_t bytes = ((void *) bset_bkey_last(sb)) - (void *) 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, bytes, SB_START) != bytes) {
perror("write error\n");
exit(EXIT_FAILURE);
}
fsync(fd);
close(fd);
}
static void write_backingdev_sb(int fd, unsigned block_size, unsigned bucket_size,
bool writeback, uint64_t data_offset,
const char *label,
uuid_le set_uuid)
{
char uuid_str[40], set_uuid_str[40];
struct cache_sb sb;
memset(&sb, 0, sizeof(struct cache_sb));
sb.offset = SB_SECTOR;
sb.version = BCACHE_SB_VERSION_BDEV;
sb.magic = BCACHE_MAGIC;
uuid_generate(sb.uuid.b);
sb.set_uuid = set_uuid;
sb.bucket_size = bucket_size;
sb.block_size = block_size;
uuid_unparse(sb.uuid.b, uuid_str);
uuid_unparse(sb.set_uuid.b, set_uuid_str);
if (label)
memcpy(sb.label, label, SB_LABEL_SIZE);
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;
}
sb.csum = csum_set(&sb, BCH_CSUM_CRC64);
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);
do_write_sb(fd, &sb);
}
static int dev_open(const char *dev, bool wipe_bcache)
{
struct cache_sb sb;
blkid_probe pr;
int fd;
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);
}
return fd;
}
static void write_cache_sbs(int *fds, struct cache_sb *sb,
unsigned block_size, unsigned bucket_size)
{
char uuid_str[40], set_uuid_str[40];
size_t i;
sb->offset = SB_SECTOR;
sb->version = BCACHE_SB_VERSION_CDEV_V3;
sb->magic = BCACHE_MAGIC;
sb->bucket_size = bucket_size;
sb->block_size = block_size;
sb->keys = bch_journal_buckets_offset(sb);
/*
* don't have a userspace crc32c implementation handy, just always use
* crc64
*/
SET_CACHE_SB_CSUM_TYPE(sb, BCH_CSUM_CRC64);
for (i = 0; i < sb->nr_in_set; i++) {
struct cache_member *m = sb->members + i;
sb->uuid = m->uuid;
sb->nbuckets = getblocks(fds[i]) / sb->bucket_size;
sb->nr_this_dev = i;
sb->first_bucket = (23 / sb->bucket_size) + 1;
if (sb->nbuckets < 1 << 7) {
fprintf(stderr, "Not enough buckets: %llu, need %u\n",
sb->nbuckets, 1 << 7);
exit(EXIT_FAILURE);
}
sb->csum = csum_set(sb, CACHE_SB_CSUM_TYPE(sb));
uuid_unparse(sb->uuid.b, uuid_str);
uuid_unparse(sb->set_uuid.b, set_uuid_str);
printf("UUID: %s\n"
"Set UUID: %s\n"
"version: %u\n"
"nbuckets: %llu\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);
do_write_sb(fds[i], sb);
}
}
static void next_cache_device(struct cache_sb *sb,
unsigned replication_set,
unsigned tier,
unsigned replacement_policy,
bool discard)
{
struct cache_member *m = sb->members + sb->nr_in_set;
SET_CACHE_REPLICATION_SET(m, replication_set);
SET_CACHE_TIER(m, tier);
SET_CACHE_REPLACEMENT(m, replacement_policy);
SET_CACHE_DISCARD(m, discard);
uuid_generate(m->uuid.b);
sb->nr_in_set++;
}
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;
}
static long strtoul_or_die(const char *p, size_t max, const char *msg)
{
errno = 0;
long v = strtol(optarg, NULL, 10);
if (errno || v < 0 || v >= max) {
fprintf(stderr, "Invalid %s %zi\n", msg, v);
exit(EXIT_FAILURE);
}
return v;
}
int main(int argc, char **argv)
{
int c, bdev = -1;
size_t i, nr_backing_devices = 0;
unsigned block_size = 0, bucket_size = 1024;
unsigned block_size = 0;
unsigned bucket_sizes[argc];
int num_bucket_sizes = 0;
int writeback = 0, discard = 0, wipe_bcache = 0;
unsigned replication_set = 0, tier = 0, replacement_policy = 0;
uint64_t data_offset = BDEV_DATA_START_DEFAULT;
@ -418,6 +114,7 @@ int main(int argc, char **argv)
SET_CACHE_PREFERRED_CSUM_TYPE(cache_set_sb, BCH_CSUM_CRC32C);
SET_CACHE_SET_META_REPLICAS_WANT(cache_set_sb, 1);
SET_CACHE_SET_DATA_REPLICAS_WANT(cache_set_sb, 1);
bucket_sizes[0] = 1024;
while ((c = getopt_long(argc, argv,
"-hCBU:w:b:l:",
@ -448,7 +145,8 @@ int main(int argc, char **argv)
break;
case 'b':
bucket_size = hatoi_validate(optarg, "bucket size");
bucket_sizes[num_bucket_sizes] = hatoi_validate(optarg, "bucket size");
num_bucket_sizes++;
break;
case 'w':
block_size = hatoi_validate(optarg, "block size");
@ -518,10 +216,14 @@ int main(int argc, char **argv)
usage();
}
if (bucket_size < block_size) {
fprintf(stderr, "Bucket size cannot be smaller than block size\n");
exit(EXIT_FAILURE);
}
i = 0;
do {
if (bucket_sizes[i] < block_size) {
fprintf(stderr, "Bucket size cannot be smaller than block size\n");
exit(EXIT_FAILURE);
}
i++;
} while (i < num_bucket_sizes);
if (!block_size) {
for (i = 0; i < cache_set_sb->nr_in_set; i++)
@ -539,11 +241,12 @@ int main(int argc, char **argv)
for (i = 0; i < nr_backing_devices; i++)
backing_dev_fd[i] = dev_open(backing_devices[i], wipe_bcache);
write_cache_sbs(cache_dev_fd, cache_set_sb, block_size, bucket_size);
write_cache_sbs(cache_dev_fd, cache_set_sb, block_size,
bucket_sizes, num_bucket_sizes);
for (i = 0; i < nr_backing_devices; i++)
write_backingdev_sb(backing_dev_fd[i],
block_size, bucket_size,
block_size, bucket_sizes,
writeback, data_offset,
backing_dev_labels[i],
cache_set_sb->set_uuid);