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btrfs-progs: In find-root, dump bytenr for every slot. #5

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Nov 30, 2011
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btrfs-progs: In find-root, dump bytenr for every slot. #5

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60 changes: 59 additions & 1 deletion find-root.c
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Original file line number Diff line number Diff line change
Expand Up @@ -258,8 +258,63 @@ static struct btrfs_root *open_ctree_broken(int fd, const char *device)
return NULL;
}

static int dump_root_bytenr(struct btrfs_root *root, u64 bytenr, u64 gen)
{
struct btrfs_root *tmp = malloc(sizeof(struct btrfs_root));
struct btrfs_path *path;
struct btrfs_key key;
struct btrfs_root_item ri;
struct extent_buffer *leaf;
struct btrfs_disk_key disk_key;
struct btrfs_key found_key;
int slot;
int ret;

if (!tmp)
return -ENOMEM;

__setup_root(4096, 4096, 4096, 4096, tmp,
root->fs_info, BTRFS_ROOT_TREE_OBJECTID);

tmp->node = read_tree_block(root, bytenr, 4096, gen);

key.objectid = 0;
key.type = BTRFS_ROOT_ITEM_KEY;
key.offset = -1;

path = btrfs_alloc_path();

/* Walk the slots of this root looking for BTRFS_ROOT_ITEM_KEYs. */
ret = btrfs_search_slot(NULL, tmp, &key, path, 0, 0);
BUG_ON(ret < 0);
while (1) {
leaf = path->nodes[0];
slot = path->slots[0];
if (slot >= btrfs_header_nritems(leaf)) {
ret = btrfs_next_leaf(tmp, path);
if (ret != 0)
break;
leaf = path->nodes[0];
slot = path->slots[0];
}
btrfs_item_key(leaf, &disk_key, path->slots[0]);
btrfs_disk_key_to_cpu(&found_key, &disk_key);
if (btrfs_key_type(&found_key) == BTRFS_ROOT_ITEM_KEY) {
unsigned long offset;

offset = btrfs_item_ptr_offset(leaf, slot);
read_extent_buffer(leaf, &ri, offset, sizeof(ri));
printf("Generation: %Lu Root bytenr: %Lu\n", gen, btrfs_root_bytenr(&ri));
}
path->slots[0]++;
}
btrfs_free_path(path);
free_extent_buffer(leaf);
return 0;
}

static int search_iobuf(struct btrfs_root *root, void *iobuf,
size_t iobuf_size, off_t offset)
size_t iobuf_size, off_t offset)
{
u64 gen = btrfs_super_generation(&root->fs_info->super_copy);
u64 objectid = search_objectid;
Expand Down Expand Up @@ -290,6 +345,9 @@ static int search_iobuf(struct btrfs_root *root, void *iobuf,
h_byte);
goto next;
}
/* Found some kind of root and it's fairly valid. */
if (dump_root_bytenr(root, h_byte, h_gen))
break;
if (h_gen != gen) {
fprintf(stderr, "Well block %Lu seems great, "
"but generation doesn't match, "
Expand Down