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exfat_blkdev.c
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exfat_blkdev.c
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/*
* Copyright (C) 2012-2013 Samsung Electronics Co., Ltd.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
/************************************************************************/
/* */
/* PROJECT : exFAT & FAT12/16/32 File System */
/* FILE : exfat_blkdev.c */
/* PURPOSE : exFAT Block Device Driver Glue Layer */
/* */
/*----------------------------------------------------------------------*/
/* NOTES */
/* */
/*----------------------------------------------------------------------*/
/* REVISION HISTORY (Ver 0.9) */
/* */
/* - 2010.11.15 [Joosun Hahn] : first writing */
/* */
/************************************************************************/
#include <linux/blkdev.h>
#include <linux/log2.h>
#include "exfat_config.h"
#include "exfat_blkdev.h"
#include "exfat_data.h"
#include "exfat_api.h"
#include "exfat_super.h"
/*----------------------------------------------------------------------*/
/* Constant & Macro Definitions */
/*----------------------------------------------------------------------*/
/*----------------------------------------------------------------------*/
/* Global Variable Definitions */
/*----------------------------------------------------------------------*/
/*----------------------------------------------------------------------*/
/* Local Variable Definitions */
/*----------------------------------------------------------------------*/
/*======================================================================*/
/* Function Definitions */
/*======================================================================*/
s32 bdev_init(void)
{
return FFS_SUCCESS;
}
s32 bdev_shutdown(void)
{
return FFS_SUCCESS;
}
s32 bdev_open(struct super_block *sb)
{
BD_INFO_T *p_bd = &(EXFAT_SB(sb)->bd_info);
if (p_bd->opened)
return FFS_SUCCESS;
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;
return FFS_SUCCESS;
}
s32 bdev_close(struct super_block *sb)
{
BD_INFO_T *p_bd = &(EXFAT_SB(sb)->bd_info);
if (!p_bd->opened)
return FFS_SUCCESS;
p_bd->opened = FALSE;
return FFS_SUCCESS;
}
s32 bdev_read(struct super_block *sb, sector_t secno, struct buffer_head **bh, u32 num_secs, s32 read)
{
BD_INFO_T *p_bd = &(EXFAT_SB(sb)->bd_info);
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 FFS_SUCCESS;
WARN(!p_fs->dev_ejected,
"[EXFAT] No bh, device seems wrong or to be ejected.\n");
return FFS_MEDIAERR;
}
s32 bdev_write(struct super_block *sb, sector_t secno, struct buffer_head *bh, u32 num_secs, s32 sync)
{
s32 count;
struct buffer_head *bh2;
BD_INFO_T *p_bd = &(EXFAT_SB(sb)->bd_info);
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 == NULL)
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 FFS_SUCCESS;
no_bh:
WARN(!p_fs->dev_ejected,
"[EXFAT] No bh, device seems wrong or to be ejected.\n");
return FFS_MEDIAERR;
}
s32 bdev_sync(struct super_block *sb)
{
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);
}