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Btrfs-progs: debug-tree, add option to dump a single tree 

Very often while debugging filesystems with many subvolumes and/or
snapshots, specially when they are large, I want to see only the
content of one of the trees. So this change just adds an option
to btrfs-debug-tree to allow to specify the id of the tree we're
interesting in dumping to stdout.

Example:  btrfs-debug-tree -t 257 /dev/sdc

Will only dump the tree of the first snapshot or subvolume that was
created.

Signed-off-by: Filipe David Borba Manana <fdmanana@gmail.com>
Signed-off-by: David Sterba <dsterba@suse.cz>
master
Filipe David Borba Manana 2014-05-23 14:44:29 +01:00 committed by David Sterba
parent fd518cfcb1
commit 602aac5dbf
1 changed files with 10 additions and 2 deletions
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12
btrfs-debug-tree.c
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@ -41,6 +41,8 @@ static int print_usage(void)
fprintf(stderr, "\t-u : print info of uuid tree only\n");
fprintf(stderr, "\t-b block_num : print info of the specified block"
" only\n");
fprintf(stderr,
"\t-t tree_id : print only the tree with the given id\n");
fprintf(stderr, "%s\n", BTRFS_BUILD_VERSION);
exit(1);
}
@ -136,12 +138,13 @@ int main(int ac, char **av)
int root_backups = 0;
u64 block_only = 0;
struct btrfs_root *tree_root_scan;
u64 tree_id = 0;
radix_tree_init();
while(1) {
int c;
c = getopt(ac, av, "deb:rRu");
c = getopt(ac, av, "deb:rRut:");
if (c < 0)
break;
switch(c) {
@ -164,6 +167,9 @@ int main(int ac, char **av)
case 'b':
block_only = arg_strtou64(optarg);
break;
case 't':
tree_id = arg_strtou64(optarg);
break;
default:
print_usage();
}
@ -208,7 +214,7 @@ int main(int ac, char **av)
goto close_root;
}
if (!(extent_only || uuid_tree_only)) {
if (!(extent_only || uuid_tree_only || tree_id)) {
if (roots_only) {
printf("root tree: %llu level %d\n",
(unsigned long long)info->tree_root->node->start,
@ -268,6 +274,8 @@ again:
0);
if (!extent_buffer_uptodate(buf))
goto next;
if (tree_id && found_key.objectid != tree_id)
goto next;
switch(found_key.objectid) {
case BTRFS_ROOT_TREE_OBJECTID: