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// 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);
}
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