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btrfs-progs: uuid: Port kernel btrfs_uuid_tree_lookup() 

Although we have btrfs_uuid_tree_lookup_any(), it's an online function
utilizing tree search ioctl, not an offline search function.

This patch will port kernel btrfs_uuid_tree_lookup() into btrfs-progs
for later proper uuid tree initialization.

Signed-off-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
master
Qu Wenruo 2019-01-03 15:32:19 +08:00 committed by David Sterba
parent e4ca845778
commit 97955f8197
1 changed files with 71 additions and 2 deletions
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73
uuid-tree.c
View File

@ -23,6 +23,7 @@
#include "transaction.h"
#include "disk-io.h"
#include "print-tree.h"
#include "utils.h"
static void btrfs_uuid_to_key(const u8 *uuid, u64 *key_objectid,
@ -32,8 +33,11 @@ static void btrfs_uuid_to_key(const u8 *uuid, u64 *key_objectid,
*key_offset = get_unaligned_le64(uuid + sizeof(u64));
}
/* return -ENOENT for !found, < 0 for errors, or 0 if an item was found */
/*
* Search uuid tree - mounted
*
* return -ENOENT for !found, < 0 for errors, or 0 if an item was found
*/
static int btrfs_uuid_tree_lookup_any(int fd, const u8 *uuid, u8 type,
u64 *subid)
{
@ -103,3 +107,68 @@ int btrfs_lookup_uuid_received_subvol_item(int fd, const u8 *uuid,
BTRFS_UUID_KEY_RECEIVED_SUBVOL,
subvol_id);
}
/*
* Search uuid tree - unmounted
*
* return -ENOENT for !found, < 0 for errors, or 0 if an item was found
*/
static int btrfs_uuid_tree_lookup(struct btrfs_root *uuid_root, u8 *uuid,
u8 type, u64 subid)
{
int ret;
struct btrfs_path *path = NULL;
struct extent_buffer *eb;
int slot;
u32 item_size;
unsigned long offset;
struct btrfs_key key;
if (!uuid_root) {
ret = -ENOENT;
goto out;
}
path = btrfs_alloc_path();
if (!path) {
ret = -ENOMEM;
goto out;
}
btrfs_uuid_to_key(uuid, &key.objectid, &key.offset);
key.type = type;
ret = btrfs_search_slot(NULL, uuid_root, &key, path, 0, 0);
if (ret < 0) {
goto out;
} else if (ret > 0) {
ret = -ENOENT;
goto out;
}
eb = path->nodes[0];
slot = path->slots[0];
item_size = btrfs_item_size_nr(eb, slot);
offset = btrfs_item_ptr_offset(eb, slot);
ret = -ENOENT;
if (!IS_ALIGNED(item_size, sizeof(u64))) {
warning("uuid item with invalid size %lu!",
(unsigned long)item_size);
goto out;
}
while (item_size) {
__le64 data;
read_extent_buffer(eb, &data, offset, sizeof(data));
if (le64_to_cpu(data) == subid) {
ret = 0;
break;
}
offset += sizeof(data);
item_size -= sizeof(data);
}
out:
btrfs_free_path(path);
return ret;
}