diff options
Diffstat (limited to 'include/exfat_dir.h')
| -rw-r--r-- | include/exfat_dir.h | 100 |
1 files changed, 100 insertions, 0 deletions
diff --git a/include/exfat_dir.h b/include/exfat_dir.h new file mode 100644 index 0000000..d450c61 --- /dev/null +++ b/include/exfat_dir.h @@ -0,0 +1,100 @@ +/* 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; /* cluster * 2 */ + __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 |