linux/fs/exfat/misc.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  Written 1992,1993 by Werner Almesberger
 *  22/11/2000 - Fixed fat_date_unix2dos for dates earlier than 01/01/1980
 *		 and date_dos2unix for date==0 by Igor Zhbanov([email protected])
 * Copyright (C) 2012-2013 Samsung Electronics Co., Ltd.
 */

#include <linux/time.h>
#include <linux/fs.h>
#include <linux/slab.h>
#include <linux/buffer_head.h>
#include <linux/blk_types.h>

#include "exfat_raw.h"
#include "exfat_fs.h"

/*
 * exfat_fs_error reports a file system problem that might indicate fa data
 * corruption/inconsistency. Depending on 'errors' mount option the
 * panic() is called, or error message is printed FAT and nothing is done,
 * or filesystem is remounted read-only (default behavior).
 * In case the file system is remounted read-only, it can be made writable
 * again by remounting it.
 */
void __exfat_fs_error(struct super_block *sb, int report, const char *fmt, ...)
{ … }

#define SECS_PER_MIN …
#define TIMEZONE_SEC(x) …

static void exfat_adjust_tz(struct timespec64 *ts, u8 tz_off)
{ … }

static inline int exfat_tz_offset(struct exfat_sb_info *sbi)
{ … }

/* Convert a EXFAT time/date pair to a UNIX date (seconds since 1 1 70). */
void exfat_get_entry_time(struct exfat_sb_info *sbi, struct timespec64 *ts,
		u8 tz, __le16 time, __le16 date, u8 time_cs)
{ … }

/* Convert linear UNIX date to a EXFAT time/date pair. */
void exfat_set_entry_time(struct exfat_sb_info *sbi, struct timespec64 *ts,
		u8 *tz, __le16 *time, __le16 *date, u8 *time_cs)
{ … }

/*
 * The timestamp for access_time has double seconds granularity.
 * (There is no 10msIncrement field for access_time unlike create/modify_time)
 * atime also has only a 2-second resolution.
 */
void exfat_truncate_atime(struct timespec64 *ts)
{ … }

void exfat_truncate_inode_atime(struct inode *inode)
{ … }

u16 exfat_calc_chksum16(void *data, int len, u16 chksum, int type)
{ … }

u32 exfat_calc_chksum32(void *data, int len, u32 chksum, int type)
{ … }

void exfat_update_bh(struct buffer_head *bh, int sync)
{ … }

int exfat_update_bhs(struct buffer_head **bhs, int nr_bhs, int sync)
{ … }

void exfat_chain_set(struct exfat_chain *ec, unsigned int dir,
		unsigned int size, unsigned char flags)
{ … }

void exfat_chain_dup(struct exfat_chain *dup, struct exfat_chain *ec)
{ … }