Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  *  Written 1992,1993 by Werner Almesberger
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *  22/11/2000 - Fixed fat_date_unix2dos for dates earlier than 01/01/1980
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  *		 and date_dos2unix for date==0 by Igor Zhbanov(bsg@uniyar.ac.ru)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  * Copyright (C) 2012-2013 Samsung Electronics Co., Ltd.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #include <linux/time.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/buffer_head.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include "exfat_raw.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include "exfat_fs.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18)  * exfat_fs_error reports a file system problem that might indicate fa data
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19)  * corruption/inconsistency. Depending on 'errors' mount option the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20)  * panic() is called, or error message is printed FAT and nothing is done,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21)  * or filesystem is remounted read-only (default behavior).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22)  * In case the file system is remounted read-only, it can be made writable
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23)  * again by remounting it.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) void __exfat_fs_error(struct super_block *sb, int report, const char *fmt, ...)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 	struct exfat_mount_options *opts = &EXFAT_SB(sb)->options;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 	va_list args;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 	struct va_format vaf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 	if (report) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 		va_start(args, fmt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 		vaf.fmt = fmt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 		vaf.va = &args;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 		exfat_err(sb, "error, %pV", &vaf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 		va_end(args);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 	if (opts->errors == EXFAT_ERRORS_PANIC) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 		panic("exFAT-fs (%s): fs panic from previous error\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 			sb->s_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 	} else if (opts->errors == EXFAT_ERRORS_RO && !sb_rdonly(sb)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 		sb->s_flags |= SB_RDONLY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 		exfat_err(sb, "Filesystem has been set read-only");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49)  * exfat_msg() - print preformated EXFAT specific messages.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50)  * All logs except what uses exfat_fs_error() should be written by exfat_msg()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) void exfat_msg(struct super_block *sb, const char *level, const char *fmt, ...)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 	struct va_format vaf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	va_list args;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 	va_start(args, fmt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 	vaf.fmt = fmt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 	vaf.va = &args;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 	/* level means KERN_ pacility level */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 	printk("%sexFAT-fs (%s): %pV\n", level, sb->s_id, &vaf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 	va_end(args);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) #define SECS_PER_MIN    (60)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) #define TIMEZONE_SEC(x)	((x) * 15 * SECS_PER_MIN)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) static void exfat_adjust_tz(struct timespec64 *ts, u8 tz_off)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	if (tz_off <= 0x3F)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 		ts->tv_sec -= TIMEZONE_SEC(tz_off);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	else /* 0x40 <= (tz_off & 0x7F) <=0x7F */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 		ts->tv_sec += TIMEZONE_SEC(0x80 - tz_off);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) /* Convert a EXFAT time/date pair to a UNIX date (seconds since 1 1 70). */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) void exfat_get_entry_time(struct exfat_sb_info *sbi, struct timespec64 *ts,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 		u8 tz, __le16 time, __le16 date, u8 time_cs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 	u16 t = le16_to_cpu(time);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 	u16 d = le16_to_cpu(date);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 	ts->tv_sec = mktime64(1980 + (d >> 9), d >> 5 & 0x000F, d & 0x001F,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 			      t >> 11, (t >> 5) & 0x003F, (t & 0x001F) << 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 	/* time_cs field represent 0 ~ 199cs(1990 ms) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	if (time_cs) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 		ts->tv_sec += time_cs / 100;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 		ts->tv_nsec = (time_cs % 100) * 10 * NSEC_PER_MSEC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 	} else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 		ts->tv_nsec = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	if (tz & EXFAT_TZ_VALID)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 		/* Adjust timezone to UTC0. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 		exfat_adjust_tz(ts, tz & ~EXFAT_TZ_VALID);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 		/* Convert from local time to UTC using time_offset. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 		ts->tv_sec -= sbi->options.time_offset * SECS_PER_MIN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) /* Convert linear UNIX date to a EXFAT time/date pair. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) void exfat_set_entry_time(struct exfat_sb_info *sbi, struct timespec64 *ts,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 		u8 *tz, __le16 *time, __le16 *date, u8 *time_cs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 	struct tm tm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	u16 t, d;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	time64_to_tm(ts->tv_sec, 0, &tm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 	t = (tm.tm_hour << 11) | (tm.tm_min << 5) | (tm.tm_sec >> 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 	d = ((tm.tm_year - 80) <<  9) | ((tm.tm_mon + 1) << 5) | tm.tm_mday;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	*time = cpu_to_le16(t);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	*date = cpu_to_le16(d);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	/* time_cs field represent 0 ~ 199cs(1990 ms) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 	if (time_cs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 		*time_cs = (tm.tm_sec & 1) * 100 +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 			ts->tv_nsec / (10 * NSEC_PER_MSEC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 	 * Record 00h value for OffsetFromUtc field and 1 value for OffsetValid
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 	 * to indicate that local time and UTC are the same.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 	*tz = EXFAT_TZ_VALID;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129)  * The timestamp for access_time has double seconds granularity.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130)  * (There is no 10msIncrement field for access_time unlike create/modify_time)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131)  * atime also has only a 2-second resolution.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) void exfat_truncate_atime(struct timespec64 *ts)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 	ts->tv_sec = round_down(ts->tv_sec, 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 	ts->tv_nsec = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) u16 exfat_calc_chksum16(void *data, int len, u16 chksum, int type)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 	int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 	u8 *c = (u8 *)data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 	for (i = 0; i < len; i++, c++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 		if (unlikely(type == CS_DIR_ENTRY && (i == 2 || i == 3)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 			continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 		chksum = ((chksum << 15) | (chksum >> 1)) + *c;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 	return chksum;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) u32 exfat_calc_chksum32(void *data, int len, u32 chksum, int type)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 	int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 	u8 *c = (u8 *)data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 	for (i = 0; i < len; i++, c++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 		if (unlikely(type == CS_BOOT_SECTOR &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 			     (i == 106 || i == 107 || i == 112)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 			continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 		chksum = ((chksum << 31) | (chksum >> 1)) + *c;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 	return chksum;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) void exfat_update_bh(struct buffer_head *bh, int sync)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 	set_buffer_uptodate(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	mark_buffer_dirty(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 	if (sync)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 		sync_dirty_buffer(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) int exfat_update_bhs(struct buffer_head **bhs, int nr_bhs, int sync)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 	int i, err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 	for (i = 0; i < nr_bhs; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 		set_buffer_uptodate(bhs[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 		mark_buffer_dirty(bhs[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 		if (sync)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 			write_dirty_buffer(bhs[i], 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 	for (i = 0; i < nr_bhs && sync; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 		wait_on_buffer(bhs[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 		if (!err && !buffer_uptodate(bhs[i]))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 			err = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 	return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) void exfat_chain_set(struct exfat_chain *ec, unsigned int dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 		unsigned int size, unsigned char flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 	ec->dir = dir;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 	ec->size = size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 	ec->flags = flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) void exfat_chain_dup(struct exfat_chain *dup, struct exfat_chain *ec)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 	return exfat_chain_set(dup, ec->dir, ec->size, ec->flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) }