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https://github.com/brain-hackers/u-boot-brain
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![Qu Wenruo](/assets/img/avatar_default.png)
This cleans up the now unneeded code from the old btrfs implementation. Signed-off-by: Qu Wenruo <wqu@suse.com> Reviewed-by: Marek Behún <marek.behun@nic.cz>
235 lines
5.4 KiB
C
235 lines
5.4 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 <malloc.h>
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#include "ctree.h"
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#include "btrfs.h"
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#include "disk-io.h"
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/*
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* Resolve the path of ino inside subvolume @root into @path_ret.
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*
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* @path_ret must be at least PATH_MAX size.
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*/
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static int get_path_in_subvol(struct btrfs_root *root, u64 ino, char *path_ret)
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{
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struct btrfs_path path;
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struct btrfs_key key;
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char *tmp;
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u64 cur = ino;
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int ret = 0;
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tmp = malloc(PATH_MAX);
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if (!tmp)
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return -ENOMEM;
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tmp[0] = '\0';
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btrfs_init_path(&path);
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while (cur != BTRFS_FIRST_FREE_OBJECTID) {
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struct btrfs_inode_ref *iref;
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int name_len;
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btrfs_release_path(&path);
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key.objectid = cur;
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key.type = BTRFS_INODE_REF_KEY;
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key.offset = (u64)-1;
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ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0);
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/* Impossible */
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if (ret == 0)
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ret = -EUCLEAN;
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if (ret < 0)
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goto out;
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ret = btrfs_previous_item(root, &path, cur,
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BTRFS_INODE_REF_KEY);
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if (ret > 0)
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ret = -ENOENT;
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if (ret < 0)
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goto out;
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strncpy(tmp, path_ret, PATH_MAX);
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iref = btrfs_item_ptr(path.nodes[0], path.slots[0],
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struct btrfs_inode_ref);
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name_len = btrfs_inode_ref_name_len(path.nodes[0],
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iref);
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if (name_len > BTRFS_NAME_LEN) {
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ret = -ENAMETOOLONG;
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goto out;
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}
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read_extent_buffer(path.nodes[0], path_ret,
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(unsigned long)(iref + 1), name_len);
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path_ret[name_len] = '/';
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path_ret[name_len + 1] = '\0';
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strncat(path_ret, tmp, PATH_MAX);
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btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]);
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cur = key.offset;
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}
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out:
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btrfs_release_path(&path);
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free(tmp);
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return ret;
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}
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static int list_one_subvol(struct btrfs_root *root, char *path_ret)
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{
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struct btrfs_fs_info *fs_info = root->fs_info;
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struct btrfs_root *tree_root = fs_info->tree_root;
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struct btrfs_path path;
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struct btrfs_key key;
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char *tmp;
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u64 cur = root->root_key.objectid;
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int ret = 0;
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tmp = malloc(PATH_MAX);
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if (!tmp)
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return -ENOMEM;
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tmp[0] = '\0';
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path_ret[0] = '\0';
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btrfs_init_path(&path);
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while (cur != BTRFS_FS_TREE_OBJECTID) {
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struct btrfs_root_ref *rr;
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struct btrfs_key location;
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int name_len;
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u64 ino;
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key.objectid = cur;
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key.type = BTRFS_ROOT_BACKREF_KEY;
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key.offset = (u64)-1;
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btrfs_release_path(&path);
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ret = btrfs_search_slot(NULL, tree_root, &key, &path, 0, 0);
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if (ret == 0)
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ret = -EUCLEAN;
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if (ret < 0)
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goto out;
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ret = btrfs_previous_item(tree_root, &path, cur,
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BTRFS_ROOT_BACKREF_KEY);
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if (ret > 0)
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ret = -ENOENT;
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if (ret < 0)
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goto out;
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/* Get the subvolume name */
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rr = btrfs_item_ptr(path.nodes[0], path.slots[0],
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struct btrfs_root_ref);
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strncpy(tmp, path_ret, PATH_MAX);
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name_len = btrfs_root_ref_name_len(path.nodes[0], rr);
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if (name_len > BTRFS_NAME_LEN) {
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ret = -ENAMETOOLONG;
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goto out;
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}
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ino = btrfs_root_ref_dirid(path.nodes[0], rr);
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read_extent_buffer(path.nodes[0], path_ret,
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(unsigned long)(rr + 1), name_len);
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path_ret[name_len] = '/';
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path_ret[name_len + 1] = '\0';
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strncat(path_ret, tmp, PATH_MAX);
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/* Get the path inside the parent subvolume */
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btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]);
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location.objectid = key.offset;
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location.type = BTRFS_ROOT_ITEM_KEY;
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location.offset = (u64)-1;
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root = btrfs_read_fs_root(fs_info, &location);
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if (IS_ERR(root)) {
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ret = PTR_ERR(root);
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goto out;
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}
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ret = get_path_in_subvol(root, ino, path_ret);
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if (ret < 0)
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goto out;
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cur = key.offset;
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}
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/* Add the leading '/' */
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strncpy(tmp, path_ret, PATH_MAX);
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strncpy(path_ret, "/", PATH_MAX);
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strncat(path_ret, tmp, PATH_MAX);
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out:
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btrfs_release_path(&path);
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free(tmp);
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return ret;
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}
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static int list_subvolums(struct btrfs_fs_info *fs_info)
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{
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struct btrfs_root *tree_root = fs_info->tree_root;
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struct btrfs_root *root;
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struct btrfs_path path;
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struct btrfs_key key;
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char *result;
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int ret = 0;
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result = malloc(PATH_MAX);
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if (!result)
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return -ENOMEM;
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ret = list_one_subvol(fs_info->fs_root, result);
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if (ret < 0)
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goto out;
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root = fs_info->fs_root;
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printf("ID %llu gen %llu path %.*s\n",
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root->root_key.objectid, btrfs_root_generation(&root->root_item),
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PATH_MAX, result);
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key.objectid = BTRFS_FIRST_FREE_OBJECTID;
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key.type = BTRFS_ROOT_ITEM_KEY;
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key.offset = 0;
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btrfs_init_path(&path);
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ret = btrfs_search_slot(NULL, tree_root, &key, &path, 0, 0);
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if (ret < 0)
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goto out;
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while (1) {
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if (path.slots[0] >= btrfs_header_nritems(path.nodes[0]))
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goto next;
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btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]);
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if (key.objectid > BTRFS_LAST_FREE_OBJECTID)
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break;
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if (key.objectid < BTRFS_FIRST_FREE_OBJECTID ||
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key.type != BTRFS_ROOT_ITEM_KEY)
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goto next;
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key.offset = (u64)-1;
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root = btrfs_read_fs_root(fs_info, &key);
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if (IS_ERR(root)) {
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ret = PTR_ERR(root);
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if (ret == -ENOENT)
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goto next;
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}
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ret = list_one_subvol(root, result);
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if (ret < 0)
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goto out;
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printf("ID %llu gen %llu path %.*s\n",
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root->root_key.objectid,
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btrfs_root_generation(&root->root_item),
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PATH_MAX, result);
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next:
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ret = btrfs_next_item(tree_root, &path);
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if (ret < 0)
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goto out;
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if (ret > 0) {
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ret = 0;
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break;
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}
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}
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out:
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free(result);
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return ret;
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}
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void btrfs_list_subvols(void)
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{
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struct btrfs_fs_info *fs_info = current_fs_info;
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int ret;
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if (!fs_info)
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return;
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ret = list_subvolums(fs_info);
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if (ret < 0)
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error("failed to list subvolume: %d", ret);
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}
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