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btrfs-progs: Switch btrfs-find-root to use the find-root infrastructure 

Since the new find-root infrastructure is here with better root
judgement with less codes, just switch to it.

To switch to the new infrastructure, new print function is added and
output format is slighted changed.

Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.cz>
This commit is contained in:
Qu Wenruo 2015-01-16 16:22:09 +08:00 committed by David Sterba
parent 8e3eb7a6e8
commit a34d4eab3a
1 changed files with 70 additions and 9 deletions
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79
btrfs-find-root.c
View File

@ -31,6 +31,8 @@
#include "volumes.h" #include "volumes.h"
#include "utils.h" #include "utils.h"
#include "crc32c.h" #include "crc32c.h"
#include "extent-cache.h"
#include "find-root.h"
static u16 csum_size = 0; static u16 csum_size = 0;
static u64 search_objectid = BTRFS_ROOT_TREE_OBJECTID; static u64 search_objectid = BTRFS_ROOT_TREE_OBJECTID;
@ -330,22 +332,70 @@ static void get_root_gen_and_level(u64 objectid, struct btrfs_fs_info *fs_info,
} }
} }
static void print_one_result(struct cache_extent *tree_block,
u8 level, u64 generation,
struct btrfs_find_root_filter *filter)
{
int unsure = 0;
if (filter->match_gen == (u64)-1 || filter->match_level == (u8)-1)
unsure = 1;
printf("Well block %llu(gen: %llu level: %u) seems good, ",
tree_block->start, generation, level);
if (unsure)
printf("but we are unsure about the correct generation/level\n");
else
printf("but generation/level doesn't match, want gen: %llu level: %u\n",
filter->match_gen, filter->match_level);
}
static void print_find_root_result(struct cache_tree *result,
struct btrfs_find_root_filter *filter)
{
struct btrfs_find_root_gen_cache *gen_cache;
struct cache_extent *cache;
struct cache_extent *tree_block;
u64 generation = 0;
u8 level = 0;
for (cache = last_cache_extent(result);
cache; cache = prev_cache_extent(cache)) {
gen_cache = container_of(cache,
struct btrfs_find_root_gen_cache, cache);
level = gen_cache->highest_level;
generation = cache->start;
if (level == filter->match_level &&
generation == filter->match_gen)
continue;
for (tree_block = last_cache_extent(&gen_cache->eb_tree);
tree_block; tree_block = prev_cache_extent(tree_block))
print_one_result(tree_block, level, generation, filter);
}
}
int main(int argc, char **argv) int main(int argc, char **argv)
{ {
struct btrfs_root *root; struct btrfs_root *root;
struct btrfs_find_root_filter filter = {0};
struct cache_tree result;
struct cache_extent *found;
int opt; int opt;
int ret; int ret;
/* Default to search root tree */
filter.objectid = BTRFS_ROOT_TREE_OBJECTID;
filter.match_gen = (u64)-1;
filter.match_level = (u8)-1;
while ((opt = getopt(argc, argv, "l:o:g:")) != -1) { while ((opt = getopt(argc, argv, "l:o:g:")) != -1) {
switch(opt) { switch(opt) {
case 'o': case 'o':
search_objectid = arg_strtou64(optarg); filter.objectid = arg_strtou64(optarg);
break; break;
case 'g': case 'g':
search_generation = arg_strtou64(optarg); filter.generation = arg_strtou64(optarg);
break; break;
case 'l': case 'l':
search_level = arg_strtou64(optarg); filter.level = arg_strtou64(optarg);
break; break;
default: default:
usage(); usage();
@ -365,13 +415,24 @@ int main(int argc, char **argv)
fprintf(stderr, "Open ctree failed\n"); fprintf(stderr, "Open ctree failed\n");
exit(1); exit(1);
} }
cache_tree_init(&result);
if (search_generation == 0) get_root_gen_and_level(filter.objectid, root->fs_info,
get_root_gen_and_level(search_objectid, root->fs_info, &filter.match_gen, &filter.match_level);
&search_generation, NULL); ret = btrfs_find_root_search(root, &filter, &result, &found);
if (ret < 0) {
csum_size = btrfs_super_csum_size(root->fs_info->super_copy); fprintf(stderr, "Fail to search the tree root: %s\n",
ret = find_root(root); strerror(-ret));
goto out;
}
if (ret > 0) {
printf("Found tree root at %llu gen %llu level %u\n",
found->start, filter.match_gen, filter.match_level);
ret = 0;
}
print_find_root_result(&result, &filter);
out:
btrfs_find_root_free(&result);
close_ctree(root); close_ctree(root);
return ret; return ret;
} }