1 /* SPDX-License-Identifier: GPL-2.0-or-later */
3 * Copyright (C) 2021 LG Electronics.
5 * Author(s): Hyunchul Lee <hyc.lee@gmail.com>
13 struct exfat_dentry_loc;
16 struct exfat_de_iter {
18 struct exfat_inode *parent;
19 struct buffer_desc *buffer_desc; /* cluster * 2 */
21 unsigned int ra_begin_offset;
22 unsigned int ra_partial_size;
23 unsigned int read_size; /* cluster size */
24 unsigned int write_size; /* sector size */
26 off_t next_read_offset;
27 int max_skip_dentries;
28 #define DOT_NAME_NUM_MAX 9999999
29 unsigned int dot_name_num;
32 struct exfat_lookup_filter {
35 /* return 0 if matched, return 1 if not matched,
36 * otherwise return errno
38 int (*filter)(struct exfat_de_iter *iter,
39 void *param, int *dentry_count);
43 struct exfat_dentry *dentry_set;
46 /* device offset where the dentry_set locates, or
47 * the empty slot locates or EOF if not found.
53 int exfat_de_iter_init(struct exfat_de_iter *iter, struct exfat *exfat,
54 struct exfat_inode *dir, struct buffer_desc *bd);
55 int exfat_de_iter_get(struct exfat_de_iter *iter,
56 int ith, struct exfat_dentry **dentry);
57 int exfat_de_iter_get_dirty(struct exfat_de_iter *iter,
58 int ith, struct exfat_dentry **dentry);
59 int exfat_de_iter_flush(struct exfat_de_iter *iter);
60 int exfat_de_iter_advance(struct exfat_de_iter *iter, int skip_dentries);
61 off_t exfat_de_iter_device_offset(struct exfat_de_iter *iter);
62 off_t exfat_de_iter_file_offset(struct exfat_de_iter *iter);
64 int exfat_lookup_dentry_set(struct exfat *exfat, struct exfat_inode *parent,
65 struct exfat_lookup_filter *filter);
66 int exfat_lookup_file(struct exfat *exfat, struct exfat_inode *parent,
67 const char *name, struct exfat_lookup_filter *filter_out);
69 int exfat_create_file(struct exfat *exfat, struct exfat_inode *parent,
70 const char *name, unsigned short attr);
71 int exfat_update_file_dentry_set(struct exfat *exfat,
72 struct exfat_dentry *dset, int dcount,
74 clus_t start_clu, clus_t ccount);
75 int exfat_build_file_dentry_set(struct exfat *exfat, const char *name,
76 unsigned short attr, struct exfat_dentry **dentry_set,
78 int exfat_find_free_cluster(struct exfat *exfat, clus_t start, clus_t *new_clu);
79 int exfat_add_dentry_set(struct exfat *exfat, struct exfat_dentry_loc *loc,
80 struct exfat_dentry *dset, int dcount,
82 void exfat_calc_dentry_checksum(struct exfat_dentry *dentry,
83 uint16_t *checksum, bool primary);
84 uint16_t exfat_calc_name_hash(struct exfat *exfat,
85 __le16 *name, int len);