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https://github.com/followmsi/android_kernel_google_msm.git
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190 lines
6 KiB
C
190 lines
6 KiB
C
/*
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* Copyright (C) 2012-2013 Samsung Electronics Co., Ltd.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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/************************************************************************/
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/* */
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/* PROJECT : exFAT & FAT12/16/32 File System */
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/* FILE : exfat_blkdev.c */
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/* PURPOSE : exFAT Block Device Driver Glue Layer */
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/* */
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/*----------------------------------------------------------------------*/
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/* NOTES */
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/* */
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/*----------------------------------------------------------------------*/
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/* REVISION HISTORY (Ver 0.9) */
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/* */
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/* - 2010.11.15 [Joosun Hahn] : first writing */
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/* */
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/************************************************************************/
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#include <linux/blkdev.h>
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#include "exfat_config.h"
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#include "exfat_global.h"
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#include "exfat_blkdev.h"
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#include "exfat_data.h"
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#include "exfat_api.h"
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#include "exfat_super.h"
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/*----------------------------------------------------------------------*/
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/* Constant & Macro Definitions */
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/*----------------------------------------------------------------------*/
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/*----------------------------------------------------------------------*/
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/* Global Variable Definitions */
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/*----------------------------------------------------------------------*/
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/*----------------------------------------------------------------------*/
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/* Local Variable Definitions */
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/*----------------------------------------------------------------------*/
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/*======================================================================*/
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/* Function Definitions */
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/*======================================================================*/
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INT32 bdev_init(void)
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{
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return(FFS_SUCCESS);
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}
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INT32 bdev_shutdown(void)
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{
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return(FFS_SUCCESS);
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}
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INT32 bdev_open(struct super_block *sb)
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{
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BD_INFO_T *p_bd = &(EXFAT_SB(sb)->bd_info);
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if (p_bd->opened) return(FFS_SUCCESS);
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p_bd->sector_size = bdev_logical_block_size(sb->s_bdev);
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p_bd->sector_size_bits = my_log2(p_bd->sector_size);
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p_bd->sector_size_mask = p_bd->sector_size - 1;
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p_bd->num_sectors = i_size_read(sb->s_bdev->bd_inode) >> p_bd->sector_size_bits;
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p_bd->opened = TRUE;
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return(FFS_SUCCESS);
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}
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INT32 bdev_close(struct super_block *sb)
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{
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BD_INFO_T *p_bd = &(EXFAT_SB(sb)->bd_info);
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if (!p_bd->opened) return(FFS_SUCCESS);
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p_bd->opened = FALSE;
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return(FFS_SUCCESS);
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}
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INT32 bdev_read(struct super_block *sb, UINT32 secno, struct buffer_head **bh, UINT32 num_secs, INT32 read)
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{
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BD_INFO_T *p_bd = &(EXFAT_SB(sb)->bd_info);
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FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info);
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#if EXFAT_CONFIG_KERNEL_DEBUG
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struct exfat_sb_info *sbi = EXFAT_SB(sb);
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long flags = sbi->debug_flags;
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if (flags & EXFAT_DEBUGFLAGS_ERROR_RW) return (FFS_MEDIAERR);
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#endif /* EXFAT_CONFIG_KERNEL_DEBUG */
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if (!p_bd->opened) return(FFS_MEDIAERR);
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if (*bh) __brelse(*bh);
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if (read)
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*bh = __bread(sb->s_bdev, secno, num_secs << p_bd->sector_size_bits);
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else
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*bh = __getblk(sb->s_bdev, secno, num_secs << p_bd->sector_size_bits);
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if (*bh) return(FFS_SUCCESS);
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WARN(!p_fs->dev_ejected,
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"[EXFAT] No bh, device seems wrong or to be ejected.\n");
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return(FFS_MEDIAERR);
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}
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INT32 bdev_write(struct super_block *sb, UINT32 secno, struct buffer_head *bh, UINT32 num_secs, INT32 sync)
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{
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INT32 count;
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struct buffer_head *bh2;
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BD_INFO_T *p_bd = &(EXFAT_SB(sb)->bd_info);
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FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info);
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#if EXFAT_CONFIG_KERNEL_DEBUG
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struct exfat_sb_info *sbi = EXFAT_SB(sb);
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long flags = sbi->debug_flags;
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if (flags & EXFAT_DEBUGFLAGS_ERROR_RW) return (FFS_MEDIAERR);
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#endif /* EXFAT_CONFIG_KERNEL_DEBUG */
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if (!p_bd->opened) return(FFS_MEDIAERR);
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if (secno == bh->b_blocknr) {
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lock_buffer(bh);
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set_buffer_uptodate(bh);
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mark_buffer_dirty(bh);
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unlock_buffer(bh);
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if (sync && (sync_dirty_buffer(bh) != 0))
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return (FFS_MEDIAERR);
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} else {
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count = num_secs << p_bd->sector_size_bits;
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bh2 = __getblk(sb->s_bdev, secno, count);
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if (bh2 == NULL)
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goto no_bh;
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lock_buffer(bh2);
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MEMCPY(bh2->b_data, bh->b_data, count);
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set_buffer_uptodate(bh2);
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mark_buffer_dirty(bh2);
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unlock_buffer(bh2);
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if (sync && (sync_dirty_buffer(bh2) != 0)) {
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__brelse(bh2);
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goto no_bh;
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}
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__brelse(bh2);
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}
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return(FFS_SUCCESS);
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no_bh:
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WARN(!p_fs->dev_ejected,
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"[EXFAT] No bh, device seems wrong or to be ejected.\n");
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return (FFS_MEDIAERR);
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}
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INT32 bdev_sync(struct super_block *sb)
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{
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BD_INFO_T *p_bd = &(EXFAT_SB(sb)->bd_info);
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#if EXFAT_CONFIG_KERNEL_DEBUG
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struct exfat_sb_info *sbi = EXFAT_SB(sb);
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long flags = sbi->debug_flags;
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if (flags & EXFAT_DEBUGFLAGS_ERROR_RW) return (FFS_MEDIAERR);
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#endif /* EXFAT_CONFIG_KERNEL_DEBUG */
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if (!p_bd->opened) return(FFS_MEDIAERR);
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return sync_blockdev(sb->s_bdev);
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}
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/* end of exfat_blkdev.c */
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