431 lines
11 KiB
C
431 lines
11 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, see <http://www.gnu.org/licenses/>.
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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 : blkdev.c */
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/* PURPOSE : sdFAT 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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#include <linux/blkdev.h>
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#include <linux/log2.h>
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#include <linux/backing-dev.h>
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#include "sdfat.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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/* FUNCTIONS WHICH HAS KERNEL VERSION DEPENDENCY */
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/************************************************************************/
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#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 0, 0)
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/* EMPTY */
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#else /* LINUX_VERSION_CODE < KERNEL_VERSION(4, 0, 0) */
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static struct backing_dev_info *inode_to_bdi(struct inode *bd_inode)
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{
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return bd_inode->i_mapping->backing_dev_info;
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}
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#endif
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/*======================================================================*/
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/* Function Definitions */
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/*======================================================================*/
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s32 bdev_open_dev(struct super_block *sb)
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{
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FS_INFO_T *fsi = &(SDFAT_SB(sb)->fsi);
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if (fsi->bd_opened)
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return 0;
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fsi->bd_opened = true;
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return 0;
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}
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s32 bdev_close_dev(struct super_block *sb)
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{
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FS_INFO_T *fsi = &(SDFAT_SB(sb)->fsi);
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fsi->bd_opened = false;
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return 0;
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}
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static inline s32 block_device_ejected(struct super_block *sb)
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{
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struct inode *bd_inode = sb->s_bdev->bd_inode;
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struct backing_dev_info *bdi = inode_to_bdi(bd_inode);
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return (bdi->dev == NULL);
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}
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s32 bdev_check_bdi_valid(struct super_block *sb)
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{
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FS_INFO_T *fsi = &(SDFAT_SB(sb)->fsi);
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if (block_device_ejected(sb)) {
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if (!(fsi->prev_eio & SDFAT_EIO_BDI)) {
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fsi->prev_eio |= SDFAT_EIO_BDI;
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sdfat_log_msg(sb, KERN_ERR, "%s: block device is "
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"eliminated.(bdi:%p)", __func__, sb->s_bdi);
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}
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return -ENXIO;
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}
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return 0;
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}
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#if IS_BUILTIN(CONFIG_SDFAT_FS)
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static void __bdev_readahead(struct super_block *sb, u64 secno, u64 num_secs)
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{
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u32 sects_per_page = (PAGE_SIZE >> sb->s_blocksize_bits);
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struct blk_plug plug;
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u64 i;
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blk_start_plug(&plug);
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for (i = 0; i < num_secs; i++) {
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if (i && !(i & (sects_per_page - 1)))
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blk_flush_plug(current);
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sb_breadahead(sb, (sector_t)(secno + i));
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}
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blk_finish_plug(&plug);
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}
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#else
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static void __bdev_readahead(struct super_block *sb, u64 secno, u64 num_secs)
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{
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u64 i;
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for (i = 0; i < num_secs; i++)
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sb_breadahead(sb, (sector_t)(secno + i));
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}
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#endif
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/* Make a readahead request */
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s32 bdev_readahead(struct super_block *sb, u64 secno, u64 num_secs)
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{
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FS_INFO_T *fsi = &(SDFAT_SB(sb)->fsi);
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if (!fsi->bd_opened)
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return -EIO;
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__bdev_readahead(sb, secno, num_secs);
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return 0;
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}
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s32 bdev_mread(struct super_block *sb, u64 secno, struct buffer_head **bh, u64 num_secs, s32 read)
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{
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FS_INFO_T *fsi = &(SDFAT_SB(sb)->fsi);
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u8 blksize_bits = sb->s_blocksize_bits;
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#ifdef CONFIG_SDFAT_DBG_IOCTL
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struct sdfat_sb_info *sbi = SDFAT_SB(sb);
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long flags = sbi->debug_flags;
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if (flags & SDFAT_DEBUGFLAGS_ERROR_RW)
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return -EIO;
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#endif /* CONFIG_SDFAT_DBG_IOCTL */
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if (!fsi->bd_opened)
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return -EIO;
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brelse(*bh);
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if (read)
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*bh = __bread(sb->s_bdev, (sector_t)secno, num_secs << blksize_bits);
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else
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*bh = __getblk(sb->s_bdev, (sector_t)secno, num_secs << blksize_bits);
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/* read successfully */
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if (*bh)
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return 0;
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/*
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* patch 1.2.4 : reset ONCE warning message per volume.
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*/
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if (!(fsi->prev_eio & SDFAT_EIO_READ)) {
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fsi->prev_eio |= SDFAT_EIO_READ;
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sdfat_log_msg(sb, KERN_ERR, "%s: No bh. I/O error.", __func__);
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sdfat_debug_warn_on(1);
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}
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return -EIO;
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}
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s32 bdev_mwrite(struct super_block *sb, u64 secno, struct buffer_head *bh, u64 num_secs, s32 sync)
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{
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u64 count;
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struct buffer_head *bh2;
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FS_INFO_T *fsi = &(SDFAT_SB(sb)->fsi);
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#ifdef CONFIG_SDFAT_DBG_IOCTL
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struct sdfat_sb_info *sbi = SDFAT_SB(sb);
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long flags = sbi->debug_flags;
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if (flags & SDFAT_DEBUGFLAGS_ERROR_RW)
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return -EIO;
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#endif /* CONFIG_SDFAT_DBG_IOCTL */
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if (!fsi->bd_opened)
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return -EIO;
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if (secno == bh->b_blocknr) {
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set_buffer_uptodate(bh);
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mark_buffer_dirty(bh);
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if (sync && (sync_dirty_buffer(bh) != 0))
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return -EIO;
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} else {
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count = num_secs << sb->s_blocksize_bits;
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bh2 = __getblk(sb->s_bdev, (sector_t)secno, count);
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if (!bh2)
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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 0;
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no_bh:
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/*
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* patch 1.2.4 : reset ONCE warning message per volume.
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*/
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if (!(fsi->prev_eio & SDFAT_EIO_WRITE)) {
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fsi->prev_eio |= SDFAT_EIO_WRITE;
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sdfat_log_msg(sb, KERN_ERR, "%s: No bh. I/O error.", __func__);
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sdfat_debug_warn_on(1);
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}
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return -EIO;
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}
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s32 bdev_sync_all(struct super_block *sb)
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{
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FS_INFO_T *fsi = &(SDFAT_SB(sb)->fsi);
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#ifdef CONFIG_SDFAT_DBG_IOCTL
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struct sdfat_sb_info *sbi = SDFAT_SB(sb);
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long flags = sbi->debug_flags;
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if (flags & SDFAT_DEBUGFLAGS_ERROR_RW)
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return -EIO;
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#endif /* CONFIG_SDFAT_DBG_IOCTL */
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if (!fsi->bd_opened)
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return -EIO;
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return sync_blockdev(sb->s_bdev);
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}
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/*
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* Sector Read/Write Functions
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*/
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s32 read_sect(struct super_block *sb, u64 sec, struct buffer_head **bh, s32 read)
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{
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FS_INFO_T *fsi = &(SDFAT_SB(sb)->fsi);
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BUG_ON(!bh);
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if ((sec >= fsi->num_sectors) && (fsi->num_sectors > 0)) {
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sdfat_fs_error_ratelimit(sb,
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"%s: out of range (sect:%llu)", __func__, sec);
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return -EIO;
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}
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if (bdev_mread(sb, sec, bh, 1, read)) {
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sdfat_fs_error_ratelimit(sb,
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"%s: I/O error (sect:%llu)", __func__, sec);
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return -EIO;
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}
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return 0;
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}
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s32 write_sect(struct super_block *sb, u64 sec, struct buffer_head *bh, s32 sync)
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{
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FS_INFO_T *fsi = &(SDFAT_SB(sb)->fsi);
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BUG_ON(!bh);
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if ((sec >= fsi->num_sectors) && (fsi->num_sectors > 0)) {
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sdfat_fs_error_ratelimit(sb,
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"%s: out of range (sect:%llu)", __func__, sec);
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return -EIO;
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}
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if (bdev_mwrite(sb, sec, bh, 1, sync)) {
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sdfat_fs_error_ratelimit(sb, "%s: I/O error (sect:%llu)",
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__func__, sec);
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return -EIO;
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}
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return 0;
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}
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s32 read_msect(struct super_block *sb, u64 sec, struct buffer_head **bh, u64 num_secs, s32 read)
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{
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FS_INFO_T *fsi = &(SDFAT_SB(sb)->fsi);
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BUG_ON(!bh);
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if (((sec+num_secs) > fsi->num_sectors) && (fsi->num_sectors > 0)) {
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sdfat_fs_error_ratelimit(sb, "%s: out of range(sect:%llu len:%llu)",
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__func__, sec, num_secs);
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return -EIO;
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}
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if (bdev_mread(sb, sec, bh, num_secs, read)) {
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sdfat_fs_error_ratelimit(sb, "%s: I/O error (sect:%llu len:%llu)",
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__func__, sec, num_secs);
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return -EIO;
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}
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return 0;
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}
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s32 write_msect(struct super_block *sb, u64 sec, struct buffer_head *bh, u64 num_secs, s32 sync)
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{
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FS_INFO_T *fsi = &(SDFAT_SB(sb)->fsi);
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BUG_ON(!bh);
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if (((sec+num_secs) > fsi->num_sectors) && (fsi->num_sectors > 0)) {
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sdfat_fs_error_ratelimit(sb, "%s: out of range(sect:%llu len:%llu)",
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__func__, sec, num_secs);
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return -EIO;
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}
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if (bdev_mwrite(sb, sec, bh, num_secs, sync)) {
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sdfat_fs_error_ratelimit(sb, "%s: I/O error (sect:%llu len:%llu)",
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__func__, sec, num_secs);
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return -EIO;
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}
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return 0;
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}
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static inline void __blkdev_write_bhs(struct buffer_head **bhs, s32 nr_bhs)
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{
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s32 i;
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for (i = 0; i < nr_bhs; i++)
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write_dirty_buffer(bhs[i], WRITE);
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}
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static inline s32 __blkdev_sync_bhs(struct buffer_head **bhs, s32 nr_bhs)
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{
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s32 i, err = 0;
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for (i = 0; i < nr_bhs; 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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static inline s32 __buffer_zeroed(struct super_block *sb, u64 blknr, u64 num_secs)
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{
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struct buffer_head *bhs[MAX_BUF_PER_PAGE];
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s32 nr_bhs = MAX_BUF_PER_PAGE;
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u64 last_blknr = blknr + num_secs;
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s32 err, i, n;
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struct blk_plug plug;
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/* Zeroing the unused blocks on this cluster */
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n = 0;
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blk_start_plug(&plug);
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while (blknr < last_blknr) {
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bhs[n] = sb_getblk(sb, (sector_t)blknr);
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if (!bhs[n]) {
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err = -ENOMEM;
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blk_finish_plug(&plug);
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goto error;
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}
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memset(bhs[n]->b_data, 0, sb->s_blocksize);
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set_buffer_uptodate(bhs[n]);
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mark_buffer_dirty(bhs[n]);
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n++;
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blknr++;
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if (blknr == last_blknr)
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break;
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if (n == nr_bhs) {
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__blkdev_write_bhs(bhs, n);
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for (i = 0; i < n; i++)
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brelse(bhs[i]);
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n = 0;
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}
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}
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__blkdev_write_bhs(bhs, n);
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blk_finish_plug(&plug);
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err = __blkdev_sync_bhs(bhs, n);
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if (err)
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goto error;
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for (i = 0; i < n; i++)
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brelse(bhs[i]);
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return 0;
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error:
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EMSG("%s: failed zeroed sect %llu\n", __func__, blknr);
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for (i = 0; i < n; i++)
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bforget(bhs[i]);
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return err;
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}
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s32 write_msect_zero(struct super_block *sb, u64 sec, u64 num_secs)
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{
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FS_INFO_T *fsi = &(SDFAT_SB(sb)->fsi);
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if (((sec+num_secs) > fsi->num_sectors) && (fsi->num_sectors > 0)) {
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sdfat_fs_error_ratelimit(sb, "%s: out of range(sect:%llu len:%llu)",
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__func__, sec, num_secs);
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return -EIO;
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}
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/* Just return -EAGAIN if it is failed */
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if (__buffer_zeroed(sb, sec, num_secs))
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return -EAGAIN;
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return 0;
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} /* end of write_msect_zero */
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/* end of blkdev.c */
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