1/* SPDX-License-Identifier: GPL-2.0-or-later */ 2/* 3 * Copyright (C) 2021 LG Electronics. 4 * 5 * Author(s): Hyunchul Lee <hyc.lee@gmail.com> 6 */ 7#ifndef _EXFAT_FS_H_ 8#define _EXFAT_FS_H_ 9 10#include "list.h" 11 12struct exfat_dentry; 13 14struct exfat_inode { 15 struct exfat_inode *parent; 16 struct list_head children; 17 struct list_head sibling; 18 struct list_head list; 19 clus_t first_clus; 20 __u16 attr; 21 uint64_t size; 22 bool is_contiguous; 23 struct exfat_dentry *dentry_set; 24 int dentry_count; 25 off_t dev_offset; 26 __le16 name[0]; /* only for directory */ 27}; 28 29#define EXFAT_NAME_MAX 255 30#define NAME_BUFFER_SIZE ((EXFAT_NAME_MAX + 1) * 2) 31 32struct exfat { 33 struct exfat_blk_dev *blk_dev; 34 struct pbr *bs; 35 char volume_label[VOLUME_LABEL_BUFFER_SIZE]; 36 struct exfat_inode *root; 37 struct list_head dir_list; 38 clus_t clus_count; 39 unsigned int clus_size; 40 unsigned int sect_size; 41 char *disk_bitmap; 42 char *alloc_bitmap; 43 char *ohead_bitmap; 44 clus_t disk_bitmap_clus; 45 unsigned int disk_bitmap_size; 46 __u16 *upcase_table; 47 clus_t start_clu; 48 char *zero_cluster; 49}; 50 51struct exfat_dentry_loc { 52 struct exfat_inode *parent; 53 off_t file_offset; 54 off_t dev_offset; 55}; 56 57struct path_resolve_ctx { 58 struct exfat_inode *ancestors[255]; 59 __le16 utf16_path[PATH_MAX + 2]; 60 char local_path[PATH_MAX * MB_LEN_MAX + 1]; 61}; 62 63struct buffer_desc { 64 __u32 p_clus; 65 unsigned int offset; 66 char *buffer; 67 char *dirty; 68}; 69 70struct exfat *exfat_alloc_exfat(struct exfat_blk_dev *blk_dev, struct pbr *bs); 71void exfat_free_exfat(struct exfat *exfat); 72 73struct exfat_inode *exfat_alloc_inode(__u16 attr); 74void exfat_free_inode(struct exfat_inode *node); 75 76void exfat_free_children(struct exfat_inode *dir, bool file_only); 77void exfat_free_file_children(struct exfat_inode *dir); 78void exfat_free_ancestors(struct exfat_inode *child); 79void exfat_free_dir_list(struct exfat *exfat); 80 81int exfat_resolve_path(struct path_resolve_ctx *ctx, struct exfat_inode *child); 82int exfat_resolve_path_parent(struct path_resolve_ctx *ctx, 83 struct exfat_inode *parent, struct exfat_inode *child); 84 85struct buffer_desc *exfat_alloc_buffer(int count, 86 unsigned int clu_size, unsigned int sect_size); 87void exfat_free_buffer(struct buffer_desc *bd, int count); 88#endif 89