Training courses

Kernel and Embedded Linux

Bootlin training courses

Embedded Linux, kernel,
Yocto Project, Buildroot, real-time,
graphics, boot time, debugging...

Bootlin logo

Elixir Cross Referencer

Open Menu /drivers/staging/exfat/exfat_blkdev.c 
  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  Copyright (C) 2012-2013 Samsung Electronics Co., Ltd.
 */

#include <linux/blkdev.h>
#include <linux/buffer_head.h>
#include <linux/fs.h>
#include "exfat.h"

void bdev_open(struct super_block *sb)
{
	struct bd_info_t *p_bd = &(EXFAT_SB(sb)->bd_info);

	if (p_bd->opened)
		return;

	p_bd->sector_size      = bdev_logical_block_size(sb->s_bdev);
	p_bd->sector_size_bits = ilog2(p_bd->sector_size);
	p_bd->sector_size_mask = p_bd->sector_size - 1;
	p_bd->num_sectors      = i_size_read(sb->s_bdev->bd_inode) >>
				 p_bd->sector_size_bits;
	p_bd->opened = true;
}

void bdev_close(struct super_block *sb)
{
	struct bd_info_t *p_bd = &(EXFAT_SB(sb)->bd_info);

	p_bd->opened = false;
}

int bdev_read(struct super_block *sb, sector_t secno, struct buffer_head **bh,
	      u32 num_secs, bool read)
{
	struct bd_info_t *p_bd = &(EXFAT_SB(sb)->bd_info);
	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
#ifdef CONFIG_EXFAT_KERNEL_DEBUG
	struct exfat_sb_info *sbi = EXFAT_SB(sb);
	long flags = sbi->debug_flags;

	if (flags & EXFAT_DEBUGFLAGS_ERROR_RW)
		return FFS_MEDIAERR;
#endif /* CONFIG_EXFAT_KERNEL_DEBUG */

	if (!p_bd->opened)
		return FFS_MEDIAERR;

	if (*bh)
		__brelse(*bh);

	if (read)
		*bh = __bread(sb->s_bdev, secno,
			      num_secs << p_bd->sector_size_bits);
	else
		*bh = __getblk(sb->s_bdev, secno,
			       num_secs << p_bd->sector_size_bits);

	if (*bh)
		return 0;

	WARN(!p_fs->dev_ejected,
	     "[EXFAT] No bh, device seems wrong or to be ejected.\n");

	return FFS_MEDIAERR;
}

int bdev_write(struct super_block *sb, sector_t secno, struct buffer_head *bh,
	       u32 num_secs, bool sync)
{
	s32 count;
	struct buffer_head *bh2;
	struct bd_info_t *p_bd = &(EXFAT_SB(sb)->bd_info);
	struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
#ifdef CONFIG_EXFAT_KERNEL_DEBUG
	struct exfat_sb_info *sbi = EXFAT_SB(sb);
	long flags = sbi->debug_flags;

	if (flags & EXFAT_DEBUGFLAGS_ERROR_RW)
		return FFS_MEDIAERR;
#endif /* CONFIG_EXFAT_KERNEL_DEBUG */

	if (!p_bd->opened)
		return FFS_MEDIAERR;

	if (secno == bh->b_blocknr) {
		lock_buffer(bh);
		set_buffer_uptodate(bh);
		mark_buffer_dirty(bh);
		unlock_buffer(bh);
		if (sync && (sync_dirty_buffer(bh) != 0))
			return FFS_MEDIAERR;
	} else {
		count = num_secs << p_bd->sector_size_bits;

		bh2 = __getblk(sb->s_bdev, secno, count);
		if (!bh2)
			goto no_bh;

		lock_buffer(bh2);
		memcpy(bh2->b_data, bh->b_data, count);
		set_buffer_uptodate(bh2);
		mark_buffer_dirty(bh2);
		unlock_buffer(bh2);
		if (sync && (sync_dirty_buffer(bh2) != 0)) {
			__brelse(bh2);
			goto no_bh;
		}
		__brelse(bh2);
	}

	return 0;

no_bh:
	WARN(!p_fs->dev_ejected,
	     "[EXFAT] No bh, device seems wrong or to be ejected.\n");

	return FFS_MEDIAERR;
}

int bdev_sync(struct super_block *sb)
{
	struct bd_info_t *p_bd = &(EXFAT_SB(sb)->bd_info);
#ifdef CONFIG_EXFAT_KERNEL_DEBUG
	struct exfat_sb_info *sbi = EXFAT_SB(sb);
	long flags = sbi->debug_flags;

	if (flags & EXFAT_DEBUGFLAGS_ERROR_RW)
		return FFS_MEDIAERR;
#endif /* CONFIG_EXFAT_KERNEL_DEBUG */

	if (!p_bd->opened)
		return FFS_MEDIAERR;

	return sync_blockdev(sb->s_bdev);
}