X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=bcache.c;h=3cb5dfe99db03eef41954f9a556a54bcfe5f7602;hb=e460b80cb1f96eaa5b4b49bf7459ef73b415bfb7;hp=fe214833672cb356e38d7a165c0f10149f047ea8;hpb=2ef1c983d56438d4f53b1534545e6d0f54063ab8;p=bcachefs-tools-debian

diff --git a/bcache.c b/bcache.c
index fe21483..3cb5dfe 100644
--- a/bcache.c
+++ b/bcache.c
@@ -22,10 +22,6 @@
 
 #include "bcache.h"
 
-#define __KERNEL__
-#include <linux/bcache-ioctl.h>
-#undef __KERNEL__
-
 const char * const cache_state[] = {
 	"active",
 	"ro",
@@ -48,6 +44,21 @@ const char * const csum_types[] = {
 	NULL
 };
 
+const char * const compression_types[] = {
+	"none",
+	"lzo1x",
+	"gzip",
+	"xz",
+	NULL
+};
+
+const char * const error_actions[] = {
+	"continue",
+	"readonly",
+	"panic",
+	NULL
+};
+
 const char * const bdev_cache_mode[] = {
 	"writethrough",
 	"writeback",
@@ -150,11 +161,8 @@ ssize_t read_string_list_or_die(const char *opt, const char * const list[],
 				const char *msg)
 {
 	ssize_t v = read_string_list(opt, list);
-	if (v < 0) {
-		fprintf(stderr, "Bad %s %s\n", msg, opt);
-		exit(EXIT_FAILURE);
-
-	}
+	if (v < 0)
+		die("Bad %s %s", msg, opt);
 
 	return v;
 }
@@ -391,8 +399,7 @@ static uint64_t bch_checksum_update(unsigned type, uint64_t crc, const void *dat
 	case BCH_CSUM_CRC64:
 		return bch_crc64_update(crc, data, len);
 	default:
-		fprintf(stderr, "Unknown checksum type %u\n", type);
-		exit(EXIT_FAILURE);
+		die("Unknown checksum type %u", type);
 	}
 }
 
@@ -447,258 +454,51 @@ 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);
-	}
+	if (v & (v - 1))
+		die("%s must be a power of two", msg);
 
 	v /= 512;
 
-	if (v > USHRT_MAX) {
-		fprintf(stderr, "%s too large\n", msg);
-		exit(EXIT_FAILURE);
-	}
+	if (v > USHRT_MAX)
+		die("%s too large\n", msg);
 
-	if (!v) {
-		fprintf(stderr, "%s too small\n", msg);
-		exit(EXIT_FAILURE);
-	}
+	if (!v)
+		die("%s too small\n", msg);
 
 	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,
-			 unsigned mode, uint64_t data_offset, const char *label,
-			 uuid_le user_uuid, 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.disk_uuid.b);
-	sb.user_uuid	= user_uuid;
-	sb.set_uuid	= set_uuid;
-	sb.block_size	= block_size;
-
-	uuid_unparse(sb.disk_uuid.b, uuid_str);
-	uuid_unparse(sb.user_uuid.b, set_uuid_str);
-	if (label)
-		memcpy(sb.label, label, SB_LABEL_SIZE);
-
-	SET_BDEV_CACHE_MODE(&sb, mode);
-
-	if (data_offset != BDEV_DATA_START_DEFAULT) {
-		sb.version = BCACHE_SB_VERSION_BDEV_WITH_OFFSET;
-		sb.bdev_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)
+int dev_open(const char *dev)
 {
-	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 ((fd = open(dev, O_RDWR|O_EXCL)) == -1)
+		die("Can't open dev %s: %s\n", dev, strerror(errno));
 
-	if (pread(fd, &sb, sizeof(sb), SB_START) != sizeof(sb)) {
-		sprintf(err, "Failed to read superblock");
-		goto err;
-	}
+	if (!(pr = blkid_new_probe()))
+		die("Failed to create a new probe");
+	if (blkid_probe_set_device(pr, fd, 0, 0))
+		die("failed to set probe to device");
 
-	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)) {
+	if (blkid_probe_enable_partitions(pr, true))
+		die("Failed to enable partitions on probe");
+
+	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;
-	}
+		die("Device %s already has a non-bcache superblock, "
+		    "remove it using wipefs and wipefs -a\n", dev);
 
 	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;
-}
-
-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->u64s	= 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) {
-			m->bucket_size = bucket_sizes[0];
-		} else {
-			if (!bucket_sizes[i]) {
-				printf("No bucket size specified for cache %zu,"
-				       " using the default of %u",
-				       i, bucket_sizes[0]);
-				m->bucket_size = bucket_sizes[0];
-			} else {
-				m->bucket_size	= bucket_sizes[i];
-			}
-		}
-
-		m->nbuckets		= getblocks(fds[i]) / m->bucket_size;
-		m->first_bucket		= (23 / m->bucket_size) + 1;
-
-		if (m->nbuckets < 1 << 7) {
-			fprintf(stderr, "Not enough buckets: %llu, need %u\n",
-				m->nbuckets, 1 << 7);
-			exit(EXIT_FAILURE);
-		}
-	}
-
-	for (i = 0; i < sb->nr_in_set; i++) {
-		struct cache_member *m = sb->members + i;
-
-		SET_CACHE_BTREE_NODE_SIZE(sb, min_size);
-
-
-		sb->disk_uuid = m->uuid;
-		sb->nr_this_dev		= i;
-
-		sb->csum = csum_set(sb, CACHE_SB_CSUM_TYPE(sb));
-
-		uuid_unparse(sb->disk_uuid.b, uuid_str);
-		uuid_unparse(sb->user_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,
-		       m->nbuckets,
-		       sb->block_size,
-		       m->bucket_size,
-		       sb->nr_in_set,
-		       sb->nr_this_dev,
-		       m->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)
+unsigned get_blocksize(const char *path, int fd)
 {
 	struct stat statbuf;
 
-	if (stat(path, &statbuf)) {
-		fprintf(stderr, "Error statting %s: %s\n",
-			path, strerror(errno));
-		exit(EXIT_FAILURE);
-	}
+	if (fstat(fd, &statbuf))
+		die("Error statting %s: %s", path, strerror(errno));
 
 	if (S_ISBLK(statbuf.st_mode)) {
 		/* check IO limits:
@@ -714,17 +514,9 @@ unsigned get_blocksize(const char *path)
 		 * we want to use logical_block_size.
 		 */
 		unsigned int logical_block_size;
-		int fd = open(path, O_RDONLY);
+		if (ioctl(fd, BLKSSZGET, &logical_block_size))
+			die("ioctl(%s, BLKSSZGET) failed: %m", path);
 
-		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;
 
 	}
@@ -738,10 +530,8 @@ 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);
-	}
+	if (errno || v < 0 || v >= max)
+		die("Invalid %s %zi", msg, v);
 
 	return v;
 }
@@ -771,8 +561,7 @@ static void show_super_common(struct cache_sb *sb, bool force_csum)
 		printf("ok\n");
 	} else {
 		printf("bad magic\n");
-		fprintf(stderr, "Invalid superblock (bad magic)\n");
-		exit(2);
+		die("Invalid superblock (bad magic)");
 	}
 
 	printf("sb.first_sector\t\t%ju", (uint64_t) sb->offset);
@@ -780,8 +569,7 @@ static void show_super_common(struct cache_sb *sb, bool force_csum)
 		printf(" [match]\n");
 	} else {
 		printf(" [expected %ds]\n", SB_SECTOR);
-		fprintf(stderr, "Invalid superblock (bad sector)\n");
-		exit(2);
+		die("Invalid superblock (bad sector)");
 	}
 
 	printf("sb.csum\t\t\t%ju", (uint64_t) sb->csum);
@@ -793,10 +581,8 @@ static void show_super_common(struct cache_sb *sb, bool force_csum)
 		printf(" [match]\n");
 	} else {
 		printf(" [expected %" PRIX64 "]\n", expected_csum);
-		if (force_csum) {
-			fprintf(stderr, "Corrupt superblock (bad csum)\n");
-			exit(2);
-		}
+		if (force_csum)
+			die("Corrupt superblock (bad csum)");
 	}
 
 	printf("sb.version\t\t%ju", (uint64_t) sb->version);
@@ -835,6 +621,10 @@ static void show_super_common(struct cache_sb *sb, bool force_csum)
 
 	uuid_unparse(sb->user_uuid.b, uuid);
 	printf("cset.uuid\t\t%s\n", uuid);
+
+	uuid_unparse(sb->set_uuid.b, uuid);
+	printf("internal.uuid\t%s\n", uuid);
+
 }
 
 void show_super_backingdev(struct cache_sb *sb, bool force_csum)
@@ -860,9 +650,13 @@ void show_super_backingdev(struct cache_sb *sb, bool force_csum)
 void show_super_cache(struct cache_sb *sb, bool force_csum)
 {
 	struct cache_member *m = sb->members + sb->nr_this_dev;
+	char uuid[16];
 
 	show_super_common(sb, force_csum);
 
+	uuid_unparse(m->uuid.b, uuid);
+	printf("dev.cache.uuid\t%s\n", uuid);
+
 	printf("dev.sectors_per_block\t%u\n"
 	       "dev.sectors_per_bucket\t%u\n",
 	       sb->block_size,
@@ -887,8 +681,6 @@ void show_super_cache(struct cache_sb *sb, bool force_csum)
 	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));
@@ -1000,55 +792,6 @@ char *dev_name(const char *ugly_path) {
 	return strdup(buf);
 }
 
-static void list_cacheset_devs(char *cset_dir, char *cset_name, bool parse_dev_name)
-{
-	DIR *cachedir, *dir;
-	struct stat cache_stat;
-	char entry[MAX_PATH];
-	struct dirent *ent;
-	snprintf(entry, MAX_PATH, "%s/%s", cset_dir, cset_name);
-
-	if((dir = opendir(entry)) != NULL) {
-		while((ent = readdir(dir)) != NULL) {
-			char buf[MAX_PATH];
-			int len;
-			char *tmp;
-
-			/*
-			 * We are looking for all cache# directories
-			 * do a strlen < 9 to skip over other entries
-			 * that also start with "cache"
-			 */
-			if(strncmp(ent->d_name, "cache", 5) ||
-					!(strlen(ent->d_name) < 9))
-				continue;
-
-			snprintf(entry, MAX_PATH, "%s/%s/%s",
-					cset_dir,
-					cset_name,
-					ent->d_name);
-
-			if((cachedir = opendir(entry)) == NULL)
-				continue;
-
-			if(stat(entry, &cache_stat))
-				continue;
-
-			if((len = readlink(entry, buf, sizeof(buf) - 1)) !=
-					-1) {
-				buf[len] = '\0';
-				if(parse_dev_name) {
-					tmp = dev_name(buf);
-					printf("/dev%s\n", tmp);
-					free(tmp);
-				} else {
-					printf("\t%s\n", buf);
-				}
-			}
-		}
-	}
-}
-
 char *find_matching_uuid(char *stats_dir, char *subdir, const char *stats_dev_uuid)
 {
 	/* Do a query-dev --uuid only to get the uuid
@@ -1121,373 +864,21 @@ char *find_matching_uuid(char *stats_dir, char *subdir, const char *stats_dev_uu
 	return err;
 }
 
-char *list_cachesets(char *cset_dir, bool list_devs)
+int bcachectl_open(void)
 {
-	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];
-
-		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;
-		}
+	int fd = open("/dev/bcache-ctl", O_RDWR);
+	if (fd < 0)
+		die("Can't open bcache device: %s", strerror(errno));
 
-		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_extent0", O_RDWR);
-	if (bcachefd < 0) {
-		err = "Can't open bcache device";
-		goto err;
-	}
-
-	ret = ioctl(bcachefd, BCH_IOCTL_STOP);
-	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 *add_devices(char *const *devs)
-{
-	int ret, bcachefd;
-	char *err = NULL;
-
-	bcachefd = open("/dev/bcache_extent0", O_RDWR);
-	if (bcachefd < 0) {
-		err = "Can't open bcache device";
-		goto err;
-	}
-
-	struct bch_ioctl_add_disks ia;
-	ia.devs = devs;
-
-	ret = ioctl(bcachefd, BCH_IOCTL_ADD_DISKS, &ia);
-	if (ret < 0) {
-		char tmp[128];
-		snprintf(tmp, 128, "ioctl add disk error: %s\n",
-				strerror(ret));
-		err = strdup(tmp);
-	}
-
-err:
-	close(bcachefd);
-	return err;
-}
-
-char *remove_device(const char *dev, bool force)
-{
-	int ret, bcachefd;
-	char *err = NULL;
-
-	bcachefd = open("/dev/bcache_extent0", O_RDWR);
-	if (bcachefd < 0) {
-		err = "Can't open bcache device";
-		goto err;
-	}
-
-	struct bch_ioctl_rm_disk ir;
-	ir.dev = dev;
-	ir.force = force ? 1 : 0;
-
-	ret = ioctl(bcachefd, BCH_IOCTL_RM_DISK, &ir);
-	if (ret < 0) {
-		char tmp[128];
-		snprintf(tmp, 128, "ioctl add disk error: %s\n",
-				strerror(ret));
-		err = strdup(tmp);
-	}
-
-err:
-	close(bcachefd);
-	return err;
-}
-
-char *device_set_failed(const char *dev_uuid) {
-	int ret, bcachefd;
-	char *err = NULL;
-	uuid_le dev;
-	struct bch_ioctl_disk_failed df;
-
-	bcachefd = open("/dev/bcache_extent0", O_RDWR);
-	if (bcachefd < 0) {
-		err = "Can't open bcache device";
-		goto err;
-	}
-
-	uuid_parse(dev_uuid, dev.b);
-	df.dev_uuid = dev;
-
-	ret = ioctl(bcachefd, BCH_IOCTL_SET_DISK_FAILED, &df);
-	if (ret < 0) {
-		char tmp[128];
-		snprintf(tmp, 128, "ioctl set disk failed error %s\n",
-				strerror(ret));
-		err = strdup(tmp);
-	}
-
-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.disk_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;
+	return fd;
 }
 
-char *read_stat_dir(DIR *dir, char *stats_dir, char *stat_name, char *ret)
+unsigned nr_args(char *const *args)
 {
-	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)) {
-		FILE *fp = NULL;
+	unsigned i;
 
-		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;
-		}
+	for (i = 0; args[i]; i++)
+		;
 
-		while(fgets(ret, MAX_PATH, fp));
-		fclose(fp);
-	}
-err:
-	return err;
-}
-
-char *bcache_get_capacity(const char *cset_dir, const char *capacity_uuid,
-			  bool show_devs)
-{
-	char *err = NULL;
-	char bucket_size_path[MAX_PATH];
-	char nbuckets_path[MAX_PATH];
-	char avail_buckets_path[MAX_PATH];
-	char cache_path[MAX_PATH];
-
-	double bucket_sizes[MAX_DEVS];
-	double nbuckets[MAX_DEVS];
-	double avail_buckets[MAX_DEVS];
-	char *dev_names[MAX_DEVS];
-	int dev_count = 0, i;
-	char intbuf[4];
-	double total_cap = 0, total_free = 0;
-	int precision = 2;
-
-	snprintf(bucket_size_path, MAX_PATH, "%s/%s/%s/%s", cset_dir,
-			capacity_uuid, "cache0", "bucket_size_bytes");
-	snprintf(nbuckets_path, MAX_PATH, "%s/%s/%s/%s", cset_dir,
-			capacity_uuid, "cache0", "nbuckets");
-	snprintf(avail_buckets_path, MAX_PATH, "%s/%s/%s/%s", cset_dir,
-			capacity_uuid, "cache0", "available_buckets");
-	snprintf(cache_path, MAX_PATH, "%s/%s/%s", cset_dir, capacity_uuid,
-			"cache0");
-
-	while (true) {
-		char buf[MAX_PATH];
-		int len;
-		DIR *cache_dir;
-
-		if((cache_dir = opendir(cache_path)) == NULL)
-			break;
-
-		err = read_stat_dir(cache_dir, cache_path,
-				"bucket_size_bytes", buf);
-		if (err)
-			goto err;
-		else
-			bucket_sizes[dev_count] = atof(buf);
-
-		err = read_stat_dir(cache_dir, cache_path,
-				"nbuckets", buf);
-		if (err)
-			goto err;
-		else
-			nbuckets[dev_count] = atof(buf);
-
-		err = read_stat_dir(cache_dir, cache_path,
-				"available_buckets", buf);
-		if (err)
-			goto err;
-		else
-			avail_buckets[dev_count] = atof(buf);
-
-		if((len = readlink(cache_path, buf, sizeof(buf) - 1)) != -1) {
-			buf[len] = '\0';
-			dev_names[dev_count] = dev_name(buf);
-		}
-
-		snprintf(intbuf, 4, "%d", dev_count);
-
-		/* remove i/stat and append i++/stat */
-		bucket_size_path[strlen(cache_path) - strlen(intbuf)] = 0;
-		nbuckets_path[strlen(cache_path) - strlen(intbuf)] = 0;
-		avail_buckets_path[strlen(cache_path) - strlen(intbuf)] = 0;
-		cache_path[strlen(cache_path) - strlen(intbuf)] = 0;
-
-		dev_count++;
-
-		strcat(cache_path, intbuf);
-		strcat(bucket_size_path, intbuf);
-		strcat(nbuckets_path, intbuf);
-		strcat(avail_buckets_path, intbuf);
-	}
-
-	printf("%-15s%-25s%-25s\n", "Device Name", "Capacity (512 Blocks)", "Free (512 Blocks)");
-
-	if (show_devs) {
-		for (i = 0; i < dev_count; i++) {
-			printf("%s%-11s%-25.*f%-25.*f\n", "/dev", dev_names[i],
-				precision,
-				(bucket_sizes[i] * nbuckets[i]) / 512,
-				precision,
-				(bucket_sizes[i] * avail_buckets[i]) / 512);
-		}
-	}
-
-	for (i = 0; i < dev_count; i++) {
-		total_cap += (bucket_sizes[i] * nbuckets[i]) / 512;
-		total_free += (bucket_sizes[i] * avail_buckets[i]) / 512;
-
-	}
-
-	printf("%-15s%-25.*f%-25.*f\n", "Total", precision, total_cap,
-			precision, total_free);
-
-err:
-	for (i = 0; i < dev_count; i++)
-		if (dev_names[i])
-			free(dev_names[i]);
-	return err;
+	return i;
 }