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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2024, Huawei Technologies Co, Ltd.
*
* Authors: Huang Xiaojia <huangxiaojia2@huawei.com>
* Zhihao Cheng <chengzhihao1@huawei.com>
*/
#include <stdio.h>
#include <stdlib.h>
#include <sys/stat.h>
#include "linux_err.h"
#include "kmem.h"
#include "ubifs.h"
#include "defs.h"
#include "debug.h"
#include "key.h"
#include "fsck.ubifs.h"
#define LOST_FOUND_DIR_NAME "lost+found"
/**
* check_and_create_lost_found - Check and create the lost+found directory.
* @c: UBIFS file-system description object
*
* This function checks whether the lost+found directory exists and creates a
* new one if no valid lost+found existing. If there is a valid lost+found
* directory, inode number is stored in @FSCK(c)->lost_and_found. Returns zero
* in case of success, a negative error code in case of failure.
*/
int check_and_create_lost_found(struct ubifs_info *c)
{
struct ubifs_inode *root_ui, *lost_found_ui;
struct fscrypt_name nm;
int err = 0;
root_ui = ubifs_lookup_by_inum(c, UBIFS_ROOT_INO);
if (IS_ERR(root_ui)) {
err = PTR_ERR(root_ui);
/* Previous step ensures that the root dir is valid. */
ubifs_assert(c, err != -ENOENT);
return err;
}
if (root_ui->flags & UBIFS_CRYPT_FL) {
ubifs_msg(c, "The root dir is encrypted, skip checking lost+found");
goto free_root;
}
fname_name(&nm) = LOST_FOUND_DIR_NAME;
fname_len(&nm) = strlen(LOST_FOUND_DIR_NAME);
lost_found_ui = ubifs_lookup(c, root_ui, &nm);
if (IS_ERR(lost_found_ui)) {
err = PTR_ERR(lost_found_ui);
if (err != -ENOENT)
goto free_root;
/* Not found. Create a new lost+found. */
err = ubifs_mkdir(c, root_ui, &nm, S_IRUGO | S_IWUSR | S_IXUSR);
if (err < 0) {
if (err == -ENOSPC) {
ubifs_msg(c, "No free space to create lost+found");
err = 0;
}
goto free_root;
}
lost_found_ui = ubifs_lookup(c, root_ui, &nm);
if (IS_ERR(lost_found_ui)) {
err = PTR_ERR(lost_found_ui);
ubifs_assert(c, err != -ENOENT);
goto free_root;
}
FSCK(c)->lost_and_found = lost_found_ui->vfs_inode.inum;
ubifs_msg(c, "Create the lost+found");
} else if (!(lost_found_ui->flags & UBIFS_CRYPT_FL) &&
S_ISDIR(lost_found_ui->vfs_inode.mode)) {
FSCK(c)->lost_and_found = lost_found_ui->vfs_inode.inum;
} else {
ubifs_msg(c, "The type of lost+found is %s%s",
ubifs_get_type_name(ubifs_get_dent_type(lost_found_ui->vfs_inode.mode)),
lost_found_ui->flags & UBIFS_CRYPT_FL ? ", encrypted" : "");
}
kfree(lost_found_ui);
free_root:
kfree(root_ui);
return err;
}
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