From: Martin Wilck <mwi...@arcor.de>
Option -B causes btrfs-debug-tree to dump the tree rooted at
the backup root number given instead of the real root.
Signed-off-by: Martin Wilck <mwi...@arcor.de>
---
btrfs-debug-tree.c | 39 ++++++++++++++++++++++++++++++++++++++-
1 files changed, 38 insertions(+), 1 deletions(-)
diff --git a/btrfs-debug-tree.c b/btrfs-debug-tree.c
index e61c71c..7cdc368 100644
--- a/btrfs-debug-tree.c
+++ b/btrfs-debug-tree.c
@@ -45,6 +45,8 @@ static int print_usage(void)
" block\n");
fprintf(stderr,
"\t-t tree_id : print only the tree with the given id\n");
+ fprintf(stderr,
+ "\t-B nr: use root backup <nr> instead of real root\n");
fprintf(stderr, "%s\n", BTRFS_BUILD_VERSION);
exit(1);
}
@@ -140,6 +142,7 @@ int main(int ac, char **av)
int root_backups = 0;
u64 block_only = 0;
int block_follow = 0;
+ int use_backup = -1;
struct btrfs_root *tree_root_scan;
u64 tree_id = 0;
@@ -147,7 +150,7 @@ int main(int ac, char **av)
while(1) {
int c;
- c = getopt(ac, av, "defb:rRut:");
+ c = getopt(ac, av, "defb:rRut:B:");
if (c < 0)
break;
switch(c) {
@@ -176,6 +179,9 @@ int main(int ac, char **av)
case 't':
tree_id = arg_strtou64(optarg);
break;
+ case 'B':
+ use_backup = arg_strtou64(optarg);
+ break;
default:
print_usage();
}
@@ -221,6 +227,37 @@ int main(int ac, char **av)
goto close_root;
}
+ if (use_backup >= BTRFS_NUM_BACKUP_ROOTS) {
+ fprintf(stderr, "Invalid backup root number %d\n",
+ use_backup);
+ exit(1);
+ } else if (use_backup >= 0) {
+ u64 bytenr, generation;
+ u32 blocksize;
+ struct btrfs_super_block *sb = info->super_copy;
+ struct btrfs_root_backup *backup = sb->super_roots + use_backup;
+ struct extent_buffer *eb;
+ bytenr = btrfs_backup_tree_root(backup);
+ generation = btrfs_backup_tree_root_gen(backup);
+ blocksize = btrfs_level_size(info->tree_root,
+ btrfs_super_root_level(sb));
+ eb = info->tree_root->node;
+ info->tree_root->node = read_tree_block(root, bytenr,
+ blocksize, generation);
+ free_extent_buffer(eb);
+ bytenr = btrfs_backup_chunk_root(backup);
+ generation = btrfs_backup_chunk_root_gen(backup);
+ eb = info->chunk_root->node;
+ info->chunk_root->node = read_tree_block(root, bytenr,
+ blocksize, generation);
+ free_extent_buffer(eb);
+ if (!extent_buffer_uptodate(info->tree_root->node) ||
+ !extent_buffer_uptodate(info->tree_root->node)) {
+ fprintf(stderr, "Couldn't backup root\n");
+ return 1;
+ }
+ }
+
if (!(extent_only || uuid_tree_only || tree_id)) {
if (roots_only) {
printf("root tree: %llu level %d\n",
--
1.7.3.4
--
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