diff options
Diffstat (limited to 'ubifs-utils/fsck.ubifs/handle_disconnected.c')
| -rw-r--r-- | ubifs-utils/fsck.ubifs/handle_disconnected.c | 197 |
1 files changed, 197 insertions, 0 deletions
diff --git a/ubifs-utils/fsck.ubifs/handle_disconnected.c b/ubifs-utils/fsck.ubifs/handle_disconnected.c new file mode 100644 index 0000000..be62522 --- /dev/null +++ b/ubifs-utils/fsck.ubifs/handle_disconnected.c @@ -0,0 +1,197 @@ +// 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" +#define MAX_REPEAT_NAME_RETRY_TIMES 10000000 + +/** + * 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; +} + +static int handle_disonnected_file(struct ubifs_info *c, + struct scanned_file *file) +{ + int err = 0; + + if (FSCK(c)->lost_and_found) { + unsigned int index = 0; + char file_name[UBIFS_MAX_NLEN + 1]; + struct fscrypt_name nm; + struct ubifs_inode *ui = NULL, *lost_found_ui = NULL; + + lost_found_ui = ubifs_lookup_by_inum(c, FSCK(c)->lost_and_found); + if (IS_ERR(lost_found_ui)) { + err = PTR_ERR(lost_found_ui); + ubifs_assert(c, err != -ENOENT); + return err; + } + ui = ubifs_lookup_by_inum(c, file->inum); + if (IS_ERR(ui)) { + err = PTR_ERR(ui); + ubifs_assert(c, err != -ENOENT); + goto free_lost_found_ui; + } + + while (index < MAX_REPEAT_NAME_RETRY_TIMES) { + struct ubifs_inode *target_ui; + + err = snprintf(file_name, sizeof(file_name), + "INO_%lu_%u", file->inum, index); + if (err < 0) + goto free_ui; + fname_name(&nm) = file_name; + fname_len(&nm) = strlen(file_name); + target_ui = ubifs_lookup(c, lost_found_ui, &nm); + if (IS_ERR(target_ui)) { + err = PTR_ERR(target_ui); + if (err == -ENOENT) + break; + goto free_ui; + } + kfree(target_ui); + index++; + } + + if (err != -ENOENT) { + err = 0; + kfree(ui); + kfree(lost_found_ui); + log_out(c, "Too many duplicated names(%u) in lost+found for inum %lu", + index, file->inum); + goto delete_file; + } + + /* Try to recover disconnected file into lost+found. */ + err = ubifs_link_recovery(c, lost_found_ui, ui, &nm); + if (err && err == -ENOSPC) { + err = 0; + log_out(c, "No free space to recover disconnected file"); + goto delete_file; + } + dbg_fsck("recover disconnected file %lu, in %s", + file->inum, c->dev_name); + +free_ui: + kfree(ui); +free_lost_found_ui: + kfree(lost_found_ui); + return err; + } + + log_out(c, "No valid lost+found"); + +delete_file: + if (fix_problem(c, DISCONNECTED_FILE_CANNOT_BE_RECOVERED, file)) + err = delete_file(c, file); + return err; +} + +/** + * handle_disonnected_files - Handle disconnected files. + * @c: UBIFS file-system description object + * + * This function tries to recover disonnected files into lost+found directory. + * If there is no free space left to recover the disconnected files, fsck may + * delete the files to make filesystem be consistent. Returns zero in case of + * success, a negative error code in case of failure. + */ +int handle_disonnected_files(struct ubifs_info *c) +{ + int err, ret = 0; + struct scanned_file *file; + + while (!list_empty(&FSCK(c)->disconnected_files)) { + file = list_entry(FSCK(c)->disconnected_files.next, + struct scanned_file, list); + + list_del(&file->list); + err = handle_disonnected_file(c, file); + if (err) + ret = ret ? ret : err; + destroy_file_content(c, file); + kfree(file); + } + + return ret; +} |