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authorQu Wenruo <quwenruo@cn.fujitsu.com>2016-02-22 14:59:56 +0800
committerDavid Sterba <dsterba@suse.com>2016-02-26 17:27:58 +0100
commitc8c3715969a1e9d3af39863583cfbe4025db11d5 (patch)
treeed610203b2668861d064b60275c57c1a039d0e9b
parent9db13dca2f00b8a7cfd31fb737cfd0e73ad48abf (diff)
btrfs-progs: find-root: Allow btrfs-find-root to search chunk root even chunk root is corrupted
Since now open_ctree_fs_info() can even return a valid fs_info with only system chunk mapping from super block, use this ability to do chunk root search for heavily damanged fs. As an fast alternative for time consuming and buggy chunk-recovery. Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com> Signed-off-by: David Sterba <dsterba@suse.com>
-rw-r--r--btrfs-find-root.c17
-rw-r--r--find-root.c10
-rw-r--r--find-root.h2
3 files changed, 15 insertions, 14 deletions
diff --git a/btrfs-find-root.c b/btrfs-find-root.c
index fc3812ce..2d5bbb2a 100644
--- a/btrfs-find-root.c
+++ b/btrfs-find-root.c
@@ -69,7 +69,6 @@ static void get_root_gen_and_level(u64 objectid, struct btrfs_fs_info *fs_info,
case BTRFS_CHUNK_TREE_OBJECTID:
level = btrfs_super_chunk_root_level(super);
gen = btrfs_super_chunk_root_generation(super);
- printf("Search for chunk root is not supported yet\n");
break;
case BTRFS_TREE_LOG_OBJECTID:
level = btrfs_super_log_root_level(super);
@@ -145,7 +144,7 @@ static void print_find_root_result(struct cache_tree *result,
int main(int argc, char **argv)
{
- struct btrfs_root *root;
+ struct btrfs_fs_info *fs_info;
struct btrfs_find_root_filter filter = {0};
struct cache_tree result;
struct cache_extent *found;
@@ -192,16 +191,18 @@ int main(int argc, char **argv)
exit(1);
}
- root = open_ctree(argv[optind], 0, OPEN_CTREE_CHUNK_ROOT_ONLY);
- if (!root) {
- fprintf(stderr, "Open ctree failed\n");
+ fs_info = open_ctree_fs_info(argv[optind], 0, 0,
+ OPEN_CTREE_CHUNK_ROOT_ONLY |
+ OPEN_CTREE_IGNORE_CHUNK_TREE_ERROR);
+ if (!fs_info) {
+ error("open ctree failed");
exit(1);
}
cache_tree_init(&result);
- get_root_gen_and_level(filter.objectid, root->fs_info,
+ get_root_gen_and_level(filter.objectid, fs_info,
&filter.match_gen, &filter.match_level);
- ret = btrfs_find_root_search(root, &filter, &result, &found);
+ ret = btrfs_find_root_search(fs_info, &filter, &result, &found);
if (ret < 0) {
fprintf(stderr, "Fail to search the tree root: %s\n",
strerror(-ret));
@@ -215,7 +216,7 @@ int main(int argc, char **argv)
print_find_root_result(&result, &filter);
out:
btrfs_find_root_free(&result);
- close_ctree(root);
+ close_ctree_fs_info(fs_info);
btrfs_close_all_devices();
return ret;
}
diff --git a/find-root.c b/find-root.c
index f0204c80..823db6ad 100644
--- a/find-root.c
+++ b/find-root.c
@@ -101,17 +101,16 @@ static int add_eb_to_result(struct extent_buffer *eb,
* Return 1 if found root with given gen/level and set *match to it.
* Return <0 if error happens
*/
-int btrfs_find_root_search(struct btrfs_root *chunk_root,
+int btrfs_find_root_search(struct btrfs_fs_info *fs_info,
struct btrfs_find_root_filter *filter,
struct cache_tree *result,
struct cache_extent **match)
{
- struct btrfs_fs_info *fs_info = chunk_root->fs_info;
struct extent_buffer *eb;
u64 chunk_offset = 0;
u64 chunk_size = 0;
u64 offset = 0;
- u32 leafsize = chunk_root->leafsize;
+ u32 leafsize = btrfs_super_leafsize(fs_info->super_copy);
int suppress_errors = 0;
int ret = 0;
@@ -133,8 +132,9 @@ int btrfs_find_root_search(struct btrfs_root *chunk_root,
}
for (offset = chunk_offset;
offset < chunk_offset + chunk_size;
- offset += chunk_root->leafsize) {
- eb = read_tree_block(chunk_root, offset, leafsize, 0);
+ offset += leafsize) {
+ eb = read_tree_block_fs_info(fs_info, offset, leafsize,
+ 0);
if (!eb || IS_ERR(eb))
continue;
ret = add_eb_to_result(eb, result, leafsize, filter,
diff --git a/find-root.h b/find-root.h
index 1c67ebcc..60d1111d 100644
--- a/find-root.h
+++ b/find-root.h
@@ -65,7 +65,7 @@ struct btrfs_find_root_filter {
* This *WILL* take *TONS* of extra time.
*/
};
-int btrfs_find_root_search(struct btrfs_root *chunk_root,
+int btrfs_find_root_search(struct btrfs_fs_info *fs_info,
struct btrfs_find_root_filter *filter,
struct cache_tree *result,
struct cache_extent **match);