On 11/02/2012 22:46, Goffredo Baroncelli wrote:
Signed-off-by: Goffredo Baroncelli <kreijack@xxxxxxxxx>
---
Makefile | 5 +-
btrfs-show-super.c | 284 ++++++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 288 insertions(+), 1 deletion(-)
create mode 100644 btrfs-show-super.c
diff --git a/btrfs-show-super.c b/btrfs-show-super.c
new file mode 100644
index 0000000..a9e2524
--- /dev/null
+++ b/btrfs-show-super.c
@@ -0,0 +1,284 @@
+/*
+ * Copyright (C) 2012 STRATO AG. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License v2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 021110-1307, USA.
+ */
+
+#define _XOPEN_SOURCE 500
+#define _GNU_SOURCE 1
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <ctype.h>
+#include <uuid/uuid.h>
+#include <errno.h>
+
+#include "kerncompat.h"
+#include "ctree.h"
+#include "disk-io.h"
+#include "print-tree.h"
+#include "transaction.h"
+#include "list.h"
+#include "version.h"
+#include "utils.h"
+#include "crc32c.h"
+
+static void print_usage(void);
+static void dump_superblock(struct btrfs_super_block *sb);
+int main(int argc, char **argv);
+static int load_and_dump_sb(char *, int fd, u64 sb_bytenr);
+
+
+static void print_usage(void)
+{
+ fprintf(stderr,
+ "usage: btrfs-show-super [-i super_mirror|-a] dev [dev..]\n");
+ fprintf(stderr, "\tThe super_mirror number is between 0 and %d.\n",
+ BTRFS_SUPER_MIRROR_MAX - 1);
+ fprintf(stderr, "\tIf -a is passed all the superblocks are showed.\n",
+ BTRFS_SUPER_MIRROR_MAX - 1);
+ fprintf(stderr, "%s\n", BTRFS_BUILD_VERSION);
+}
+
+int main(int argc, char **argv)
+{
+ int opt;
+ int all = 0;
+ char *filename;
+ int fd = -1;
+ int arg, i;
+ u64 sb_bytenr = btrfs_sb_offset(0);
+
+ while ((opt = getopt(argc, argv, "ai:")) != -1) {
+ switch (opt) {
+ case 'i':
+ arg = atoi(optarg);
+
+ if (arg < 0 || arg >= BTRFS_SUPER_MIRROR_MAX) {
+ fprintf(stderr,
+ "Illegal super_mirror %d\n",
+ arg);
+ print_usage();
+ exit(1);
+ }
+ sb_bytenr = btrfs_sb_offset(arg);
+ break;
+
+ case 'a':
+ all = 1;
+ break;
+
+ default:
+ print_usage();
+ exit(1);
+ }
+ }
+
+ if (argc < optind + 1) {
+ print_usage();
+ exit(1);
+ }
+
+ for (i = optind ; i < argc ; i++) {
+ for (i = optind; i < argc; i++) {
+ filename = argv[i];
+ fd = open(filename, O_RDONLY, 0666);
+ if (fd < 0) {
+ fprintf(stderr, "Could not open %s\n", filename);
+ close(fd);
+ exit(1);
+ }
+
+ if (all) {
+ int idx;
+ for (idx = 0 ; idx < BTRFS_SUPER_MIRROR_MAX ; idx++) {
+ for (idx = 0; idx < BTRFS_SUPER_MIRROR_MAX; idx++) {
+ sb_bytenr = btrfs_sb_offset(idx);
+ if (load_and_dump_sb(filename, fd, sb_bytenr)) {
+ close(fd);
+ exit(1);
+ }
+
+ putchar('\n');
+ }
+ } else {
+ load_and_dump_sb(filename, fd, sb_bytenr);
+ putchar('\n');
+ }
+ close(fd);
+ }
+
+ exit(0);
+}
+
+static int load_and_dump_sb(char *filename, int fd, u64 sb_bytenr)
+{
+ u8 super_block_data[BTRFS_SUPER_INFO_SIZE];
+ struct btrfs_super_block *sb;
+ u64 ret;
+
+ sb = (struct btrfs_super_block *)super_block_data;
+
+ ret = pread64(fd, super_block_data, BTRFS_SUPER_INFO_SIZE, sb_bytenr);
+ if (ret != BTRFS_SUPER_INFO_SIZE) {
+ int e = errno;
+
+ /* check if the disk if too short for further superblock */
+ if (ret == 0 && e == 0)
+ return 0;
+
+ fprintf(stderr,
+ "ERROR: Failed to read the superblock on %s at %llu\n",
+ filename, (unsigned long long)sb_bytenr);
+ fprintf(stderr,
+ "ERROR: error = '%s', errno = %d\n", strerror(e), e);
+ return 1;
+ }
+ printf("superblock: bytenr=%llu, device=%s\n", sb_bytenr, filename);
+ printf("---------------------------------------------------------\n");
+ dump_superblock(sb);
+ return 0;
+}
+
+static int check_csum_sblock(void *sb, int csum_size)
+{
+ char result[csum_size];
+ u32 crc = ~(u32)0;
+
+ crc = btrfs_csum_data(NULL, (char *)sb + BTRFS_CSUM_SIZE,
+ crc, BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
+ btrfs_csum_final(crc, result);
+
+ return !memcmp(sb, &result, csum_size);
+}
+
+static void dump_superblock(struct btrfs_super_block *sb)
+{
+ int i;
+ char *s, buf[36+1];
+ u8 *p;
+
+ printf("csum\t\t\t0x");
+ for (i = 0, p = sb->csum ; i < btrfs_super_csum_size(sb) ; i++)
+ for (i = 0, p = sb->csum; i < btrfs_super_csum_size(sb); i++)
I don't like to tell my review comments twice!
+ printf("%02x", p[i]);
+ if (check_csum_sblock(sb, btrfs_super_csum_size(sb)))
+ printf(" [match]");
+ else
+ printf(" [DON'T MATCH]");
+ putchar('\n');
+
+ printf("bytenr\t\t\t%llu\n",
+ (unsigned long long)btrfs_super_bytenr(sb));
+ printf("flags\t\t\t0x%llx\n",
+ (unsigned long long)btrfs_super_flags(sb));
+
+ printf("magic\t\t\t");
+ s = (char *) &sb->magic;
+ s = (char *)&sb->magic;
+ for (i = 0 ; i < 8 ; i++)
+ for (i = 0; i < 8; i++)
Again! Same issue as complained about before. All these spaces everywhere!
+ putchar(isprint(s[i]) ? s[i] : '.');
+ if (!memcmp(BTRFS_MAGIC, &sb->magic, 8))
+ printf(" [match]\n");
+ else
+ printf(" [DON'T MATCH]\n");
+
+ uuid_unparse(sb->fsid, buf);
+ printf("fsid\t\t\t%s\n", buf);
+
+ printf("label\t\t\t");
+ s = sb->label;
+ for (i = 0 ; i < BTRFS_LABEL_SIZE && s[i] ; i++)
+ for (i = 0; i < BTRFS_LABEL_SIZE && s[i]; i++)
WTF. /me gives up for today.
+ putchar(isprint(s[i]) ? s[i] : '.');
+ putchar('\n');
+
+ printf("generation\t\t%llu\n",
+ (unsigned long long)btrfs_super_generation(sb));
+ printf("root\t\t\t%llu\n", (unsigned long long)btrfs_super_root(sb));
+ printf("sys_array_size\t\t%llu\n",
+ (unsigned long long)btrfs_super_sys_array_size(sb));
+ printf("chunk_root_generation\t%llu\n",
+ (unsigned long long)btrfs_super_chunk_root_generation(sb));
+ printf("root_level\t\t%llu\n",
+ (unsigned long long)btrfs_super_root_level(sb));
+ printf("chunk_root\t\t%llu\n",
+ (unsigned long long)btrfs_super_chunk_root(sb));
+ printf("chunk_root_level\t%llu\n",
+ (unsigned long long)btrfs_super_chunk_root_level(sb));
+ printf("log_root\t\t%llu\n",
+ (unsigned long long)btrfs_super_log_root(sb));
+ printf("log_root_transid\t%llu\n",
+ (unsigned long long)btrfs_super_log_root_transid(sb));
+ printf("log_root_level\t\t%llu\n",
+ (unsigned long long)btrfs_super_log_root_level(sb));
+ printf("total_bytes\t\t%llu\n",
+ (unsigned long long)btrfs_super_total_bytes(sb));
+ printf("bytes_used\t\t%llu\n",
+ (unsigned long long)btrfs_super_bytes_used(sb));
+ printf("sectorsize\t\t%llu\n",
+ (unsigned long long)btrfs_super_sectorsize(sb));
+ printf("nodesize\t\t%llu\n",
+ (unsigned long long)btrfs_super_nodesize(sb));
+ printf("leafsize\t\t%llu\n",
+ (unsigned long long)btrfs_super_leafsize(sb));
+ printf("stripesize\t\t%llu\n",
+ (unsigned long long)btrfs_super_stripesize(sb));
+ printf("root_dir\t\t%llu\n",
+ (unsigned long long)btrfs_super_root_dir(sb));
+ printf("num_devices\t\t%llu\n",
+ (unsigned long long)btrfs_super_num_devices(sb));
+ printf("compat_flags\t\t0x%llx\n",
+ (unsigned long long)btrfs_super_compat_flags(sb));
+ printf("compat_ro_flags\t\t0x%llx\n",
+ (unsigned long long)btrfs_super_compat_ro_flags(sb));
+ printf("incompat_flags\t\t0x%llx\n",
+ (unsigned long long)btrfs_super_incompat_flags(sb));
+ printf("csum_type\t\t%llu\n",
+ (unsigned long long)btrfs_super_csum_type(sb));
+ printf("csum_size\t\t%llu\n",
+ (unsigned long long)btrfs_super_csum_size(sb));
+ printf("cache_generation\t%llu\n",
+ (unsigned long long)btrfs_super_cache_generation(sb));
+
+ uuid_unparse(sb->dev_item.uuid, buf);
+ printf("dev_item.uuid\t\t%s\n", buf);
+
+ uuid_unparse(sb->dev_item.fsid, buf);
+ printf("dev_item.fsid\t\t%s %s\n", buf,
+ !memcmp(sb->dev_item.fsid, sb->fsid, BTRFS_FSID_SIZE) ?
+ "[match]" : "[DON'T MATCH]");
+
+ printf("dev_item.type\t\t%llu\n", (unsigned long long)
+ btrfs_stack_device_type(&sb->dev_item));
+ printf("dev_item.total_bytes\t%llu\n", (unsigned long long)
+ btrfs_stack_device_total_bytes(&sb->dev_item));
+ printf("dev_item.bytes_used\t%llu\n", (unsigned long long)
+ btrfs_stack_device_bytes_used(&sb->dev_item));
+ printf("dev_item.io_align\t%u\n", (unsigned int)
+ btrfs_stack_device_io_align(&sb->dev_item));
+ printf("dev_item.io_width\t%u\n", (unsigned int)
+ btrfs_stack_device_io_width(&sb->dev_item));
+ printf("dev_item.sector_size\t%u\n", (unsigned int)
+ btrfs_stack_device_sector_size(&sb->dev_item));
+ printf("dev_item.devid\t\t%llu\n",
+ btrfs_stack_device_id(&sb->dev_item));
+ printf("dev_item.dev_group\t%u\n", (unsigned int)
+ btrfs_stack_device_group(&sb->dev_item));
+ printf("dev_item.seek_speed\t%u\n", (unsigned int)
+ btrfs_stack_device_seek_speed(&sb->dev_item));
+ printf("dev_item.bandwidth\t%u\n", (unsigned int)
+ btrfs_stack_device_bandwidth(&sb->dev_item));
+ printf("dev_item.generation\t%llu\n", (unsigned long long)
+ btrfs_stack_device_generation(&sb->dev_item));
+}
+
--
To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
