mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-06-09 23:36:03 +09:00
83d290c56f
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
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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