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![Tetsuhiro Kohada](/assets/img/avatar_default.png)
Write multiple sectors at once when updating dir-entries. Add exfat_update_bhs() for that. It wait for write completion once instead of sector by sector. It's only effective if sync enabled. Signed-off-by: Tetsuhiro Kohada <kohada.t2@gmail.com> Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>
205 lines
5.3 KiB
C
205 lines
5.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Written 1992,1993 by Werner Almesberger
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* 22/11/2000 - Fixed fat_date_unix2dos for dates earlier than 01/01/1980
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* and date_dos2unix for date==0 by Igor Zhbanov(bsg@uniyar.ac.ru)
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* Copyright (C) 2012-2013 Samsung Electronics Co., Ltd.
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*/
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#include <linux/time.h>
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#include <linux/fs.h>
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#include <linux/slab.h>
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#include <linux/buffer_head.h>
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#include "exfat_raw.h"
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#include "exfat_fs.h"
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/*
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* exfat_fs_error reports a file system problem that might indicate fa data
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* corruption/inconsistency. Depending on 'errors' mount option the
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* panic() is called, or error message is printed FAT and nothing is done,
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* or filesystem is remounted read-only (default behavior).
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* In case the file system is remounted read-only, it can be made writable
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* again by remounting it.
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*/
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void __exfat_fs_error(struct super_block *sb, int report, const char *fmt, ...)
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{
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struct exfat_mount_options *opts = &EXFAT_SB(sb)->options;
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va_list args;
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struct va_format vaf;
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if (report) {
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va_start(args, fmt);
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vaf.fmt = fmt;
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vaf.va = &args;
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exfat_err(sb, "error, %pV", &vaf);
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va_end(args);
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}
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if (opts->errors == EXFAT_ERRORS_PANIC) {
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panic("exFAT-fs (%s): fs panic from previous error\n",
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sb->s_id);
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} else if (opts->errors == EXFAT_ERRORS_RO && !sb_rdonly(sb)) {
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sb->s_flags |= SB_RDONLY;
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exfat_err(sb, "Filesystem has been set read-only");
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}
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}
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/*
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* exfat_msg() - print preformated EXFAT specific messages.
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* All logs except what uses exfat_fs_error() should be written by exfat_msg()
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*/
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void exfat_msg(struct super_block *sb, const char *level, const char *fmt, ...)
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{
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struct va_format vaf;
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va_list args;
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va_start(args, fmt);
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vaf.fmt = fmt;
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vaf.va = &args;
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/* level means KERN_ pacility level */
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printk("%sexFAT-fs (%s): %pV\n", level, sb->s_id, &vaf);
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va_end(args);
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}
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#define SECS_PER_MIN (60)
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#define TIMEZONE_SEC(x) ((x) * 15 * SECS_PER_MIN)
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static void exfat_adjust_tz(struct timespec64 *ts, u8 tz_off)
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{
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if (tz_off <= 0x3F)
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ts->tv_sec -= TIMEZONE_SEC(tz_off);
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else /* 0x40 <= (tz_off & 0x7F) <=0x7F */
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ts->tv_sec += TIMEZONE_SEC(0x80 - tz_off);
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}
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/* Convert a EXFAT time/date pair to a UNIX date (seconds since 1 1 70). */
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void exfat_get_entry_time(struct exfat_sb_info *sbi, struct timespec64 *ts,
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u8 tz, __le16 time, __le16 date, u8 time_cs)
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{
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u16 t = le16_to_cpu(time);
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u16 d = le16_to_cpu(date);
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ts->tv_sec = mktime64(1980 + (d >> 9), d >> 5 & 0x000F, d & 0x001F,
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t >> 11, (t >> 5) & 0x003F, (t & 0x001F) << 1);
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/* time_cs field represent 0 ~ 199cs(1990 ms) */
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if (time_cs) {
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ts->tv_sec += time_cs / 100;
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ts->tv_nsec = (time_cs % 100) * 10 * NSEC_PER_MSEC;
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} else
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ts->tv_nsec = 0;
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if (tz & EXFAT_TZ_VALID)
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/* Adjust timezone to UTC0. */
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exfat_adjust_tz(ts, tz & ~EXFAT_TZ_VALID);
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else
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/* Convert from local time to UTC using time_offset. */
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ts->tv_sec -= sbi->options.time_offset * SECS_PER_MIN;
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}
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/* Convert linear UNIX date to a EXFAT time/date pair. */
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void exfat_set_entry_time(struct exfat_sb_info *sbi, struct timespec64 *ts,
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u8 *tz, __le16 *time, __le16 *date, u8 *time_cs)
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{
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struct tm tm;
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u16 t, d;
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time64_to_tm(ts->tv_sec, 0, &tm);
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t = (tm.tm_hour << 11) | (tm.tm_min << 5) | (tm.tm_sec >> 1);
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d = ((tm.tm_year - 80) << 9) | ((tm.tm_mon + 1) << 5) | tm.tm_mday;
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*time = cpu_to_le16(t);
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*date = cpu_to_le16(d);
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/* time_cs field represent 0 ~ 199cs(1990 ms) */
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if (time_cs)
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*time_cs = (tm.tm_sec & 1) * 100 +
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ts->tv_nsec / (10 * NSEC_PER_MSEC);
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/*
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* Record 00h value for OffsetFromUtc field and 1 value for OffsetValid
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* to indicate that local time and UTC are the same.
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*/
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*tz = EXFAT_TZ_VALID;
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}
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/*
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* The timestamp for access_time has double seconds granularity.
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* (There is no 10msIncrement field for access_time unlike create/modify_time)
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* atime also has only a 2-second resolution.
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*/
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void exfat_truncate_atime(struct timespec64 *ts)
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{
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ts->tv_sec = round_down(ts->tv_sec, 2);
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ts->tv_nsec = 0;
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}
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u16 exfat_calc_chksum16(void *data, int len, u16 chksum, int type)
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{
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int i;
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u8 *c = (u8 *)data;
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for (i = 0; i < len; i++, c++) {
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if (unlikely(type == CS_DIR_ENTRY && (i == 2 || i == 3)))
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continue;
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chksum = ((chksum << 15) | (chksum >> 1)) + *c;
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}
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return chksum;
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}
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u32 exfat_calc_chksum32(void *data, int len, u32 chksum, int type)
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{
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int i;
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u8 *c = (u8 *)data;
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for (i = 0; i < len; i++, c++) {
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if (unlikely(type == CS_BOOT_SECTOR &&
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(i == 106 || i == 107 || i == 112)))
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continue;
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chksum = ((chksum << 31) | (chksum >> 1)) + *c;
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}
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return chksum;
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}
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void exfat_update_bh(struct buffer_head *bh, int sync)
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{
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set_buffer_uptodate(bh);
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mark_buffer_dirty(bh);
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if (sync)
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sync_dirty_buffer(bh);
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}
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int exfat_update_bhs(struct buffer_head **bhs, int nr_bhs, int sync)
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{
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int i, err = 0;
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for (i = 0; i < nr_bhs; i++) {
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set_buffer_uptodate(bhs[i]);
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mark_buffer_dirty(bhs[i]);
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if (sync)
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write_dirty_buffer(bhs[i], 0);
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}
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for (i = 0; i < nr_bhs && sync; i++) {
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wait_on_buffer(bhs[i]);
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if (!err && !buffer_uptodate(bhs[i]))
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err = -EIO;
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}
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return err;
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}
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void exfat_chain_set(struct exfat_chain *ec, unsigned int dir,
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unsigned int size, unsigned char flags)
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{
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ec->dir = dir;
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ec->size = size;
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ec->flags = flags;
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}
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void exfat_chain_dup(struct exfat_chain *dup, struct exfat_chain *ec)
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{
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return exfat_chain_set(dup, ec->dir, ec->size, ec->flags);
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}
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