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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Copyright (C) 2021 LG Electronics.
*
* Author(s): Hyunchul Lee <hyc.lee@gmail.com>
*/
#ifndef _DIR_H_
#define _DIR_H_
struct exfat;
struct exfat_inode;
struct exfat_dentry_loc;
struct buffer_desc;
struct exfat_de_iter {
struct exfat *exfat;
struct exfat_inode *parent;
struct buffer_desc *buffer_desc;
__u32 ra_next_clus;
unsigned int ra_begin_offset;
unsigned int ra_partial_size;
unsigned int read_size; /* cluster size */
unsigned int write_size; /* sector size */
off_t de_file_offset;
off_t next_read_offset;
int max_skip_dentries;
#define INVALID_NAME_NUM_MAX 9999999
unsigned int invalid_name_num;
char *name_hash_bitmap; /* bitmap of children's name hashes */
};
struct exfat_lookup_filter {
struct {
uint8_t type;
int dentry_count;
/* return 0 if matched, return 1 if not matched,
* otherwise return errno
*/
int (*filter)(struct exfat_de_iter *iter,
void *param, int *dentry_count);
void *param;
} in;
struct {
struct exfat_dentry *dentry_set;
int dentry_count;
off_t file_offset;
/*
* If the dentry_set found:
* - device offset where the dentry_set locates.
* If the dentry_set not found:
* - device offset where the first empty dentry_set locates
* if in.dentry_count > 0 and there are enough empty dentry.
* - device offset where the last empty dentry_set locates
* if in.dentry_count = 0 or no enough empty dentry.
* - EOF if no empty dentry_set.
*/
off_t dev_offset;
} out;
};
int exfat_de_iter_init(struct exfat_de_iter *iter, struct exfat *exfat,
struct exfat_inode *dir, struct buffer_desc *bd);
int exfat_de_iter_get(struct exfat_de_iter *iter,
int ith, struct exfat_dentry **dentry);
int exfat_de_iter_get_dirty(struct exfat_de_iter *iter,
int ith, struct exfat_dentry **dentry);
int exfat_de_iter_flush(struct exfat_de_iter *iter);
int exfat_de_iter_advance(struct exfat_de_iter *iter, int skip_dentries);
off_t exfat_de_iter_device_offset(struct exfat_de_iter *iter);
off_t exfat_de_iter_file_offset(struct exfat_de_iter *iter);
int exfat_lookup_dentry_set(struct exfat *exfat, struct exfat_inode *parent,
struct exfat_lookup_filter *filter);
int exfat_lookup_file(struct exfat *exfat, struct exfat_inode *parent,
const char *name, struct exfat_lookup_filter *filter_out);
int exfat_lookup_file_by_utf16name(struct exfat *exfat,
struct exfat_inode *parent,
__le16 *utf16_name,
struct exfat_lookup_filter *filter_out);
int exfat_create_file(struct exfat *exfat, struct exfat_inode *parent,
const char *name, unsigned short attr);
int exfat_update_file_dentry_set(struct exfat *exfat,
struct exfat_dentry *dset, int dcount,
const char *name,
clus_t start_clu, clus_t ccount);
int exfat_build_file_dentry_set(struct exfat *exfat, const char *name,
unsigned short attr, struct exfat_dentry **dentry_set,
int *dentry_count);
int exfat_add_dentry_set(struct exfat *exfat, struct exfat_dentry_loc *loc,
struct exfat_dentry *dset, int dcount,
bool need_next_loc);
void exfat_calc_dentry_checksum(struct exfat_dentry *dentry,
uint16_t *checksum, bool primary);
uint16_t exfat_calc_name_hash(struct exfat *exfat,
__le16 *name, int len);
#endif
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