mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-16 17:58:23 +00:00
3b4b40c0d6
This version includes all needed on-disk format from kernel. Only need to modify the include headers for U-Boot, everything else is untouched. Also, since U-Boot btrfs is using a different endian convert timing (at tree block read time), it needs some forced type conversion before proper crossport. Signed-off-by: Qu Wenruo <wqu@suse.com> Reviewed-by: Marek Behún <marek.behun@nic.cz>
130 lines
2.7 KiB
C
130 lines
2.7 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* BTRFS filesystem implementation for U-Boot
|
|
*
|
|
* 2017 Marek Behun, CZ.NIC, marek.behun@nic.cz
|
|
*/
|
|
|
|
#include "btrfs.h"
|
|
#include <malloc.h>
|
|
|
|
static int get_subvol_name(u64 subvolid, char *name, int max_len)
|
|
{
|
|
struct btrfs_root_ref rref;
|
|
struct btrfs_inode_ref iref;
|
|
struct btrfs_root root;
|
|
u64 dir;
|
|
char tmp[BTRFS_NAME_LEN];
|
|
char *ptr;
|
|
|
|
ptr = name + max_len - 1;
|
|
*ptr = '\0';
|
|
|
|
while (subvolid != BTRFS_FS_TREE_OBJECTID) {
|
|
subvolid = btrfs_lookup_root_ref(subvolid, &rref, tmp);
|
|
|
|
if (subvolid == -1ULL)
|
|
return -1;
|
|
|
|
ptr -= rref.name_len + 1;
|
|
if (ptr < name)
|
|
goto too_long;
|
|
|
|
memcpy(ptr + 1, tmp, rref.name_len);
|
|
*ptr = '/';
|
|
|
|
if (btrfs_find_root(subvolid, &root, NULL))
|
|
return -1;
|
|
|
|
dir = rref.dirid;
|
|
|
|
while (dir != BTRFS_FIRST_FREE_OBJECTID) {
|
|
dir = btrfs_lookup_inode_ref(&root, dir, &iref, tmp);
|
|
|
|
if (dir == -1ULL)
|
|
return -1;
|
|
|
|
ptr -= iref.name_len + 1;
|
|
if (ptr < name)
|
|
goto too_long;
|
|
|
|
memcpy(ptr + 1, tmp, iref.name_len);
|
|
*ptr = '/';
|
|
}
|
|
}
|
|
|
|
if (ptr == name + max_len - 1) {
|
|
name[0] = '/';
|
|
name[1] = '\0';
|
|
} else {
|
|
memmove(name, ptr, name + max_len - ptr);
|
|
}
|
|
|
|
return 0;
|
|
|
|
too_long:
|
|
printf("%s: subvolume name too long\n", __func__);
|
|
return -1;
|
|
}
|
|
|
|
u64 btrfs_get_default_subvol_objectid(void)
|
|
{
|
|
struct btrfs_dir_item item;
|
|
|
|
if (btrfs_lookup_dir_item(&btrfs_info.tree_root,
|
|
btrfs_info.sb.root_dir_objectid, "default", 7,
|
|
&item))
|
|
return BTRFS_FS_TREE_OBJECTID;
|
|
return item.location.objectid;
|
|
}
|
|
|
|
static void list_subvols(u64 tree, char *nameptr, int max_name_len, int level)
|
|
{
|
|
struct btrfs_key key, *found_key;
|
|
struct btrfs_path path;
|
|
struct btrfs_root_ref *ref;
|
|
int res;
|
|
|
|
key.objectid = tree;
|
|
key.type = BTRFS_ROOT_REF_KEY;
|
|
key.offset = 0;
|
|
|
|
if (btrfs_search_tree(&btrfs_info.tree_root, &key, &path))
|
|
return;
|
|
|
|
do {
|
|
found_key = btrfs_path_leaf_key(&path);
|
|
if (btrfs_comp_keys_type(&key, found_key))
|
|
break;
|
|
|
|
ref = btrfs_path_item_ptr(&path, struct btrfs_root_ref);
|
|
btrfs_root_ref_to_cpu(ref);
|
|
|
|
printf("ID %llu parent %llu name ", found_key->offset, tree);
|
|
if (nameptr && !get_subvol_name(found_key->offset, nameptr,
|
|
max_name_len))
|
|
printf("%s\n", nameptr);
|
|
else
|
|
printf("%.*s\n", (int) ref->name_len,
|
|
(const char *) (ref + 1));
|
|
|
|
if (level > 0)
|
|
list_subvols(found_key->offset, nameptr, max_name_len,
|
|
level - 1);
|
|
else
|
|
printf("%s: Too much recursion, maybe skipping some "
|
|
"subvolumes\n", __func__);
|
|
} while (!(res = btrfs_next_slot(&path)));
|
|
|
|
btrfs_free_path(&path);
|
|
}
|
|
|
|
void btrfs_list_subvols(void)
|
|
{
|
|
char *nameptr = malloc(4096);
|
|
|
|
list_subvols(BTRFS_FS_TREE_OBJECTID, nameptr, nameptr ? 4096 : 0, 40);
|
|
|
|
if (nameptr)
|
|
free(nameptr);
|
|
}
|