Goffredo Baroncelli
2012-Nov-02 21:46 UTC
[PATCH][BTRFS-PROGS][V2] btrfs-show-super: a tool to dump superblock
Hi all,
I updated the Stefan''s program btrfs-show-super. Now it prints the
results of
some sanity checks (about checksum and superblock magic string), allow
more than one dovice as argument and a ''-a'' switch which dumps
all the
device superblocks.
# btrfs-show-super /dev/sdh1
superblock: bytenr=65536, device=../sysfs/disks/disk-02.img
---------------------------------------------------------
csum 0x64d9fdb9 [match]
bytenr 65536
flags 0x1
magic _BHRfS_M [match]
fsid 6d6141a6-5440-4f75-9c85-6d0ec7450187
label test2
generation 15
root 29396992
sys_array_size 355
chunk_root_generation 15
root_level 0
chunk_root 20975616
chunk_root_level 0
log_root 0
log_root_transid 0
log_root_level 0
total_bytes 117041005568
bytes_used 290816
sectorsize 4096
nodesize 4096
leafsize 4096
stripesize 4096
root_dir 6
num_devices 4
compat_flags 0x0
compat_ro_flags 0x0
incompat_flags 0x1
csum_type 0
csum_size 4
cache_generation 15
dev_item.uuid 421d2bdb-c9d9-41f8-a966-57248605f18c
dev_item.fsid 6d6141a6-5440-4f75-9c85-6d0ec7450187 [match]
dev_item.type 0
dev_item.total_bytes 3222274048
dev_item.bytes_used 1900216320
dev_item.io_align 4096
dev_item.io_width 4096
dev_item.sector_size 4096
dev_item.devid 1
dev_item.dev_group 0
dev_item.seek_speed 0
dev_item.bandwidth 0
dev_item.generation 0
You can pull the source from:
http://cassiopea.homelinux.net/git/btrfs-progs-unstable.git
branch
super-block-dump
Changelog:
v1->v2 Patch cleanup (removed unnecessary spaces to be compliant to the
kernel coding style)
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Signed-off-by: Goffredo Baroncelli <kreijack@inwind.it>
---
Makefile | 5 +-
btrfs-show-super.c | 284 ++++++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 288 insertions(+), 1 deletion(-)
create mode 100644 btrfs-show-super.c
diff --git a/Makefile b/Makefile
index 4894903..0630b5d 100644
--- a/Makefile
+++ b/Makefile
@@ -22,7 +22,7 @@ RESTORE_LIBS=-lz
progs = btrfsctl mkfs.btrfs btrfs-debug-tree btrfs-show btrfs-vol btrfsck \
btrfs btrfs-map-logical btrfs-image btrfs-zero-log btrfs-convert \
- btrfs-find-root btrfs-restore btrfstune
+ btrfs-find-root btrfs-restore btrfstune btrfs-show-super
# make C=1 to enable sparse
ifdef C
@@ -75,6 +75,9 @@ btrfs-debug-tree: $(objects) debug-tree.o
btrfs-zero-log: $(objects) btrfs-zero-log.o
$(CC) $(CFLAGS) -o btrfs-zero-log $(objects) btrfs-zero-log.o $(LDFLAGS)
$(LIBS)
+btrfs-show-super: $(objects) btrfs-show-super.o
+ $(CC) $(CFLAGS) -o btrfs-show-super $(objects) btrfs-show-super.o $(LDFLAGS)
$(LIBS)
+
btrfs-select-super: $(objects) btrfs-select-super.o
$(CC) $(CFLAGS) -o btrfs-select-super $(objects) btrfs-select-super.o
$(LDFLAGS) $(LIBS)
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++) {
+ 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++) {
+ 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 (!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++)
+ 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));
+}
+
--
1.7.10.4
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On 11/02/2012 22:46, Goffredo Baroncelli wrote:> Signed-off-by: Goffredo Baroncelli <kreijack@inwind.it> > --- > 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@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Hi Goffredo, do you think it could be useful to add an optional argument like "bytenr", which tells where to read the superblock from? For example, btrfs-convert first places the superblock on some block unused by ext2, and only at the end it migrates the superblock to the standard location. Not sure though whether there are additional use cases for this. Thanks, Alex. On Fri, Nov 2, 2012 at 11:46 PM, Goffredo Baroncelli <kreijack@gmail.com> wrote:> Signed-off-by: Goffredo Baroncelli <kreijack@inwind.it> > --- > Makefile | 5 +- > btrfs-show-super.c | 284 ++++++++++++++++++++++++++++++++++++++++++++++++++++ > 2 files changed, 288 insertions(+), 1 deletion(-) > create mode 100644 btrfs-show-super.c > > diff --git a/Makefile b/Makefile > index 4894903..0630b5d 100644 > --- a/Makefile > +++ b/Makefile > @@ -22,7 +22,7 @@ RESTORE_LIBS=-lz > > progs = btrfsctl mkfs.btrfs btrfs-debug-tree btrfs-show btrfs-vol btrfsck \ > btrfs btrfs-map-logical btrfs-image btrfs-zero-log btrfs-convert \ > - btrfs-find-root btrfs-restore btrfstune > + btrfs-find-root btrfs-restore btrfstune btrfs-show-super > > # make C=1 to enable sparse > ifdef C > @@ -75,6 +75,9 @@ btrfs-debug-tree: $(objects) debug-tree.o > btrfs-zero-log: $(objects) btrfs-zero-log.o > $(CC) $(CFLAGS) -o btrfs-zero-log $(objects) btrfs-zero-log.o $(LDFLAGS) $(LIBS) > > +btrfs-show-super: $(objects) btrfs-show-super.o > + $(CC) $(CFLAGS) -o btrfs-show-super $(objects) btrfs-show-super.o $(LDFLAGS) $(LIBS) > + > btrfs-select-super: $(objects) btrfs-select-super.o > $(CC) $(CFLAGS) -o btrfs-select-super $(objects) btrfs-select-super.o $(LDFLAGS) $(LIBS) > > 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++) { > + 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++) { > + 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 (!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++) > + 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)); > +} > + > -- > 1.7.10.4 > > -- > To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html-- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html