| /* |
| * 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"); |
| 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++) { |
| filename = argv[i]; |
| fd = open(filename, O_RDONLY, 0666); |
| if (fd < 0) { |
| fprintf(stderr, "Could not open %s\n", filename); |
| exit(1); |
| } |
| |
| if (all) { |
| int 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++) |
| 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; |
| for (i = 0; i < 8; i++) |
| putchar(isprint(s[i]) ? s[i] : '.'); |
| if (sb->magic == cpu_to_le64(BTRFS_MAGIC)) |
| 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++) |
| 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)); |
| } |