131 lines
2.7 KiB
C
131 lines
2.7 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* BTRFS filesystem implementation for U-Boot
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*
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* 2017 Marek Behun, CZ.NIC, marek.behun@nic.cz
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*/
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#include "btrfs.h"
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#include <malloc.h>
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static int get_subvol_name(u64 subvolid, char *name, int max_len)
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{
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struct btrfs_root_ref rref;
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struct btrfs_inode_ref iref;
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struct btrfs_root root;
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u64 dir;
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char tmp[max(BTRFS_VOL_NAME_MAX, BTRFS_NAME_MAX)];
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char *ptr;
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ptr = name + max_len - 1;
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*ptr = '\0';
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while (subvolid != BTRFS_FS_TREE_OBJECTID) {
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subvolid = btrfs_lookup_root_ref(subvolid, &rref, tmp);
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if (subvolid == -1ULL)
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return -1;
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ptr -= rref.name_len + 1;
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if (ptr < name)
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goto too_long;
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memcpy(ptr + 1, tmp, rref.name_len);
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*ptr = '/';
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if (btrfs_find_root(subvolid, &root, NULL))
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return -1;
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dir = rref.dirid;
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while (dir != BTRFS_FIRST_FREE_OBJECTID) {
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dir = btrfs_lookup_inode_ref(&root, dir, &iref, tmp);
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if (dir == -1ULL)
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return -1;
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ptr -= iref.name_len + 1;
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if (ptr < name)
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goto too_long;
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memcpy(ptr + 1, tmp, iref.name_len);
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*ptr = '/';
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}
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}
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if (ptr == name + max_len - 1) {
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name[0] = '/';
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name[1] = '\0';
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} else {
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memmove(name, ptr, name + max_len - ptr);
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}
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return 0;
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too_long:
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printf("%s: subvolume name too long\n", __func__);
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return -1;
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}
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u64 btrfs_get_default_subvol_objectid(void)
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{
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struct btrfs_dir_item item;
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if (btrfs_lookup_dir_item(&btrfs_info.tree_root,
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btrfs_info.sb.root_dir_objectid, "default", 7,
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&item))
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return BTRFS_FS_TREE_OBJECTID;
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return item.location.objectid;
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}
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static void list_subvols(u64 tree, char *nameptr, int max_name_len, int level)
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{
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struct btrfs_key key, *found_key;
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struct btrfs_path path;
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struct btrfs_root_ref *ref;
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int res;
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key.objectid = tree;
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key.type = BTRFS_ROOT_REF_KEY;
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key.offset = 0;
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if (btrfs_search_tree(&btrfs_info.tree_root, &key, &path))
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return;
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do {
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found_key = btrfs_path_leaf_key(&path);
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if (btrfs_comp_keys_type(&key, found_key))
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break;
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ref = btrfs_path_item_ptr(&path, struct btrfs_root_ref);
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btrfs_root_ref_to_cpu(ref);
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printf("ID %llu parent %llu name ", found_key->offset, tree);
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if (nameptr && !get_subvol_name(found_key->offset, nameptr,
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max_name_len))
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printf("%s\n", nameptr);
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else
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printf("%.*s\n", (int) ref->name_len,
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(const char *) (ref + 1));
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if (level > 0)
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list_subvols(found_key->offset, nameptr, max_name_len,
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level - 1);
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else
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printf("%s: Too much recursion, maybe skipping some "
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"subvolumes\n", __func__);
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} while (!(res = btrfs_next_slot(&path)));
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btrfs_free_path(&path);
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}
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void btrfs_list_subvols(void)
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{
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char *nameptr = malloc(4096);
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list_subvols(BTRFS_FS_TREE_OBJECTID, nameptr, nameptr ? 4096 : 0, 40);
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if (nameptr)
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free(nameptr);
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}
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