Gui Hecheng
2014-May-16 01:23 UTC
[PATCH v2] btrfs-progs: add sys_chunk_array and backup roots info to show-super
Add sys chunk array and backup roots info if the new option '-f'
if specified.
This may be useful for debugging sys_chunk related issues.
Signed-off-by: Gui Hecheng <guihc.fnst@cn.fujitsu.com>
---
Changelog:
v1->v2: add malloc failure check
---
btrfs-show-super.c | 142 ++++++++++++++++++++++++++++++++++++++++++++++++-----
print-tree.c | 2 +-
print-tree.h | 2 +
3 files changed, 132 insertions(+), 14 deletions(-)
diff --git a/btrfs-show-super.c b/btrfs-show-super.c
index d4df0ac..c2ad332 100644
--- a/btrfs-show-super.c
+++ b/btrfs-show-super.c
@@ -38,18 +38,18 @@
#include "crc32c.h"
static void print_usage(void);
-static void dump_superblock(struct btrfs_super_block *sb);
+static void dump_superblock(struct btrfs_super_block *sb, int full);
int main(int argc, char **argv);
-static int load_and_dump_sb(char *, int fd, u64 sb_bytenr);
+static int load_and_dump_sb(char *, int fd, u64 sb_bytenr, int full);
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");
+ "usage: btrfs-show-super [-i super_mirror|-a|-f] dev [dev..]\n");
+ fprintf(stderr, "\t-f : print full superblock information\n");
+ fprintf(stderr, "\t-a : print information of all superblocks\n");
+ fprintf(stderr, "\t-i <super_mirror> : specify which mirror to
print out\n");
fprintf(stderr, "%s\n", BTRFS_BUILD_VERSION);
}
@@ -57,13 +57,14 @@ int main(int argc, char **argv)
{
int opt;
int all = 0;
+ int full = 0;
char *filename;
int fd = -1;
int i;
u64 arg;
u64 sb_bytenr = btrfs_sb_offset(0);
- while ((opt = getopt(argc, argv, "ai:")) != -1) {
+ while ((opt = getopt(argc, argv, "fai:")) != -1) {
switch (opt) {
case 'i':
arg = arg_strtou64(optarg);
@@ -80,7 +81,9 @@ int main(int argc, char **argv)
case 'a':
all = 1;
break;
-
+ case 'f':
+ full = 1;
+ break;
default:
print_usage();
exit(1);
@@ -104,7 +107,8 @@ int main(int argc, char **argv)
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)) {
+ if (load_and_dump_sb(filename, fd,
+ sb_bytenr, full)) {
close(fd);
exit(1);
}
@@ -112,7 +116,7 @@ int main(int argc, char **argv)
putchar('\n');
}
} else {
- load_and_dump_sb(filename, fd, sb_bytenr);
+ load_and_dump_sb(filename, fd, sb_bytenr, full);
putchar('\n');
}
close(fd);
@@ -121,7 +125,7 @@ int main(int argc, char **argv)
exit(0);
}
-static int load_and_dump_sb(char *filename, int fd, u64 sb_bytenr)
+static int load_and_dump_sb(char *filename, int fd, u64 sb_bytenr, int full)
{
u8 super_block_data[BTRFS_SUPER_INFO_SIZE];
struct btrfs_super_block *sb;
@@ -146,7 +150,7 @@ static int load_and_dump_sb(char *filename, int fd, u64
sb_bytenr)
}
printf("superblock: bytenr=%llu, device=%s\n", sb_bytenr, filename);
printf("---------------------------------------------------------\n");
- dump_superblock(sb);
+ dump_superblock(sb, full);
return 0;
}
@@ -162,7 +166,113 @@ static int check_csum_sblock(void *sb, int csum_size)
return !memcmp(sb, &result, csum_size);
}
-static void dump_superblock(struct btrfs_super_block *sb)
+static void print_sys_chunk_array(struct btrfs_super_block *sb)
+{
+ struct extent_buffer *buf;
+ struct btrfs_disk_key *disk_key;
+ struct btrfs_chunk *chunk;
+ struct btrfs_key key;
+ u8 *ptr, *array_end;
+ u32 num_stripes;
+ u32 len = 0;
+ int i = 0;
+
+ buf = malloc(sizeof(*buf) + sizeof(*sb));
+ if (!buf) {
+ fprintf(stderr, "%s\n", strerror(ENOMEM));
+ exit(1);
+ }
+ write_extent_buffer(buf, sb, 0, sizeof(*sb));
+ ptr = sb->sys_chunk_array;
+ array_end = ptr + btrfs_super_sys_array_size(sb);
+
+ while (ptr < array_end) {
+ disk_key = (struct btrfs_disk_key *)ptr;
+ btrfs_disk_key_to_cpu(&key, disk_key);
+
+ printf("\titem %d ", i);
+ btrfs_print_key(disk_key);
+
+ len = sizeof(*disk_key);
+ putchar('\n');
+ ptr += len;
+
+ if (key.type == BTRFS_CHUNK_ITEM_KEY) {
+ chunk = (struct btrfs_chunk *)(ptr - (u8 *)sb);
+ print_chunk(buf, chunk);
+ num_stripes = btrfs_chunk_num_stripes(buf, chunk);
+ len = btrfs_chunk_item_size(num_stripes);
+ } else {
+ BUG();
+ }
+
+ ptr += len;
+ i++;
+ }
+
+ free(buf);
+}
+
+static int empty_backup(struct btrfs_root_backup *backup)
+{
+ if (backup == NULL ||
+ (backup->tree_root == 0 &&
+ backup->tree_root_gen == 0))
+ return 1;
+ return 0;
+}
+
+static void print_root_backup(struct btrfs_root_backup *backup)
+{
+ printf("\t\tbackup_tree_root:\t%llu\tgen: %llu\tlevel: %d\n",
+ btrfs_backup_tree_root(backup),
+ btrfs_backup_tree_root_gen(backup),
+ btrfs_backup_tree_root_level(backup));
+ printf("\t\tbackup_chunk_root:\t%llu\tgen: %llu\tlevel: %d\n",
+ btrfs_backup_chunk_root(backup),
+ btrfs_backup_chunk_root_gen(backup),
+ btrfs_backup_chunk_root_level(backup));
+ printf("\t\tbackup_extent_root:\t%llu\tgen: %llu\tlevel: %d\n",
+ btrfs_backup_extent_root(backup),
+ btrfs_backup_extent_root_gen(backup),
+ btrfs_backup_extent_root_level(backup));
+ printf("\t\tbackup_fs_root:\t\t%llu\tgen: %llu\tlevel: %d\n",
+ btrfs_backup_fs_root(backup),
+ btrfs_backup_fs_root_gen(backup),
+ btrfs_backup_fs_root_level(backup));
+ printf("\t\tbackup_dev_root:\t%llu\tgen: %llu\tlevel: %d\n",
+ btrfs_backup_dev_root(backup),
+ btrfs_backup_dev_root_gen(backup),
+ btrfs_backup_dev_root_level(backup));
+ printf("\t\tbackup_csum_root:\t%llu\tgen: %llu\tlevel: %d\n",
+ btrfs_backup_csum_root(backup),
+ btrfs_backup_csum_root_gen(backup),
+ btrfs_backup_csum_root_level(backup));
+
+ printf("\t\tbackup_total_bytes:\t%llu\n",
+ btrfs_backup_total_bytes(backup));
+ printf("\t\tbackup_bytes_used:\t%llu\n",
+ btrfs_backup_bytes_used(backup));
+ printf("\t\tbackup_num_devices:\t%llu\n",
+ btrfs_backup_num_devices(backup));
+ putchar('\n');
+}
+
+static void print_backup_roots(struct btrfs_super_block *sb)
+{
+ struct btrfs_root_backup *backup;
+ int i;
+
+ for (i = 0; i < BTRFS_NUM_BACKUP_ROOTS; i++) {
+ backup = sb->super_roots + i;
+ if (!empty_backup(backup)) {
+ printf("\tbackup %d:\n", i);
+ print_root_backup(backup);
+ }
+ }
+}
+
+static void dump_superblock(struct btrfs_super_block *sb, int full)
{
int i;
char *s, buf[BTRFS_UUID_UNPARSED_SIZE];
@@ -280,4 +390,10 @@ static void dump_superblock(struct btrfs_super_block *sb)
btrfs_stack_device_bandwidth(&sb->dev_item));
printf("dev_item.generation\t%llu\n", (unsigned long long)
btrfs_stack_device_generation(&sb->dev_item));
+ if (full) {
+ printf("sys_chunk_array[%d]:\n", BTRFS_SYSTEM_CHUNK_ARRAY_SIZE);
+ print_sys_chunk_array(sb);
+ printf("backup_roots[%d]:\n", BTRFS_NUM_BACKUP_ROOTS);
+ print_backup_roots(sb);
+ }
}
diff --git a/print-tree.c b/print-tree.c
index 7263b09..d46ab42 100644
--- a/print-tree.c
+++ b/print-tree.c
@@ -160,7 +160,7 @@ static int print_inode_ref_item(struct extent_buffer *eb,
struct btrfs_item *ite
return 0;
}
-static void print_chunk(struct extent_buffer *eb, struct btrfs_chunk *chunk)
+void print_chunk(struct extent_buffer *eb, struct btrfs_chunk *chunk)
{
int num_stripes = btrfs_chunk_num_stripes(eb, chunk);
int i;
diff --git a/print-tree.h b/print-tree.h
index 495b81a..479f64b 100644
--- a/print-tree.h
+++ b/print-tree.h
@@ -21,4 +21,6 @@
void btrfs_print_leaf(struct btrfs_root *root, struct extent_buffer *l);
void btrfs_print_tree(struct btrfs_root *root, struct extent_buffer *t, int
follow);
void btrfs_print_key(struct btrfs_disk_key *disk_key);
+/* for btrfs-show-super to print the system chunk array */
+void print_chunk(struct extent_buffer *eb, struct btrfs_chunk *chunk);
#endif
--
1.8.1.4
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