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btrfs-progs: dump-tree: add option to print children nodes of a given block

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When debuging with "btrfs inspect dump-tree", it's not that handy if we
want to iterate all child tree blocks starting from a specified block.

-b can only print a single block, while without -b "btrfs inspect dump-tree"
will need extra tree roots fulfilled to continue, which is not possible
for a damaged filesystem.

Add a new option --follow to iterate a sub-tree starting from block
specified by --block.

Signed-off-by: Qu Wenruo <wqu@suse.com>
[ remove the short option for now ]
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Qu Wenruo 2018-03-14 09:05:38 +08:00 committed by David Sterba
parent f37ae8d275
commit 992aa55839
2 changed files with 10 additions and 1 deletions
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2
Documentation/btrfs-inspect-internal.asciidoc
View File

@ -87,6 +87,8 @@ the respective tree root block offset
print only the uuid tree information, empty output if the tree does not exist print only the uuid tree information, empty output if the tree does not exist
-b <block_num>:::: -b <block_num>::::
print info of the specified block only print info of the specified block only
--follow::::
use with '-b', print all children tree blocks of '<block_num>'
-t <tree_id>:::: -t <tree_id>::::
print only the tree with the specified ID, where the ID can be numerical or print only the tree with the specified ID, where the ID can be numerical or
common name in a flexible human readable form common name in a flexible human readable form

9
cmds-inspect-dump-tree.c
View File

@ -198,6 +198,7 @@ const char * const cmd_inspect_dump_tree_usage[] = {
"-u|--uuid print only the uuid tree", "-u|--uuid print only the uuid tree",
"-b|--block <block_num> print info from the specified block only", "-b|--block <block_num> print info from the specified block only",
"-t|--tree <tree_id> print only tree with the given id (string or number)", "-t|--tree <tree_id> print only tree with the given id (string or number)",
"--follow use with -b, to show all children tree blocks of <block_num>",
NULL NULL
}; };
@ -223,9 +224,11 @@ int cmd_inspect_dump_tree(int argc, char **argv)
u64 block_only = 0; u64 block_only = 0;
struct btrfs_root *tree_root_scan; struct btrfs_root *tree_root_scan;
u64 tree_id = 0; u64 tree_id = 0;
bool follow = false;
while (1) { while (1) {
int c; int c;
enum { GETOPT_VAL_FOLLOW = 256 };
static const struct option long_options[] = { static const struct option long_options[] = {
{ "extents", no_argument, NULL, 'e'}, { "extents", no_argument, NULL, 'e'},
{ "device", no_argument, NULL, 'd'}, { "device", no_argument, NULL, 'd'},
@ -234,6 +237,7 @@ int cmd_inspect_dump_tree(int argc, char **argv)
{ "uuid", no_argument, NULL, 'u'}, { "uuid", no_argument, NULL, 'u'},
{ "block", required_argument, NULL, 'b'}, { "block", required_argument, NULL, 'b'},
{ "tree", required_argument, NULL, 't'}, { "tree", required_argument, NULL, 't'},
{ "follow", no_argument, NULL, GETOPT_VAL_FOLLOW },
{ NULL, 0, NULL, 0 } { NULL, 0, NULL, 0 }
}; };
@ -286,6 +290,9 @@ int cmd_inspect_dump_tree(int argc, char **argv)
} }
break; break;
} }
case GETOPT_VAL_FOLLOW:
follow = true;
break;
default: default:
usage(cmd_inspect_dump_tree_usage); usage(cmd_inspect_dump_tree_usage);
} }
@ -324,7 +331,7 @@ int cmd_inspect_dump_tree(int argc, char **argv)
(unsigned long long)block_only); (unsigned long long)block_only);
goto close_root; goto close_root;
} }
btrfs_print_tree(root, leaf, 0); btrfs_print_tree(root, leaf, follow);
free_extent_buffer(leaf); free_extent_buffer(leaf);
goto close_root; goto close_root;
} }