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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2012-2013 Samsung Electronics Co., Ltd.
*
* blkdev.c: exFAT Block Device Driver Glue Layer
*/
#include <linux/blkdev.h>
#include <linux/log2.h>
#include <linux/backing-dev.h>
#include "exfat.h"
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 0, 0)
/* EMPTY */
#else /* LINUX_VERSION_CODE < KERNEL_VERSION(4, 0, 0) */
static struct backing_dev_info *inode_to_bdi(struct inode *bd_inode)
{
return bd_inode->i_mapping->backing_dev_info;
}
#endif
s32 exfat_bdev_open_dev(struct super_block *sb)
{
FS_INFO_T *fsi = &(EXFAT_SB(sb)->fsi);
if (fsi->bd_opened)
return 0;
fsi->bd_opened = true;
return 0;
}
s32 exfat_bdev_close_dev(struct super_block *sb)
{
FS_INFO_T *fsi = &(EXFAT_SB(sb)->fsi);
fsi->bd_opened = false;
return 0;
}
static inline s32 block_device_ejected(struct super_block *sb)
{
struct inode *bd_inode = sb->s_bdev->bd_inode;
struct backing_dev_info *bdi = inode_to_bdi(bd_inode);
return (bdi->dev == NULL);
}
s32 exfat_bdev_check_bdi_valid(struct super_block *sb)
{
FS_INFO_T *fsi = &(EXFAT_SB(sb)->fsi);
if (block_device_ejected(sb)) {
if (!(fsi->prev_eio & EXFAT_EIO_BDI)) {
fsi->prev_eio |= EXFAT_EIO_BDI;
exfat_log_msg(sb, KERN_ERR, "%s: block device is "
"eliminated.(bdi:%p)", __func__, sb->s_bdi);
exfat_debug_warn_on(1);
}
return -ENXIO;
}
return 0;
}
/* Make a readahead request */
s32 exfat_bdev_readahead(struct super_block *sb, u64 secno, u64 num_secs)
{
FS_INFO_T *fsi = &(EXFAT_SB(sb)->fsi);
u32 sects_per_page = (PAGE_SIZE >> sb->s_blocksize_bits);
struct blk_plug plug;
u64 i;
if (!fsi->bd_opened)
return -EIO;
blk_start_plug(&plug);
for (i = 0; i < num_secs; i++) {
if (i && !(i & (sects_per_page - 1))) {
#ifdef MODULE
/* TODO: fix this by using proper APIs */
blk_finish_plug(&plug);
blk_start_plug(&plug);
#else
blk_flush_plug(current);
#endif
}
sb_breadahead(sb, (sector_t)(secno + i));
}
blk_finish_plug(&plug);
return 0;
}
s32 exfat_bdev_mread(struct super_block *sb, u64 secno, struct buffer_head **bh, u64 num_secs, s32 read)
{
FS_INFO_T *fsi = &(EXFAT_SB(sb)->fsi);
u8 blksize_bits = sb->s_blocksize_bits;
if (!fsi->bd_opened)
return -EIO;
brelse(*bh);
if (read)
*bh = __bread(sb->s_bdev, (sector_t)secno, num_secs << blksize_bits);
else
*bh = __getblk(sb->s_bdev, (sector_t)secno, num_secs << blksize_bits);
/* read successfully */
if (*bh)
return 0;
/*
* patch 1.2.4 : reset ONCE warning message per volume.
*/
if (!(fsi->prev_eio & EXFAT_EIO_READ)) {
fsi->prev_eio |= EXFAT_EIO_READ;
exfat_log_msg(sb, KERN_ERR, "%s: No bh. I/O error.", __func__);
exfat_debug_warn_on(1);
}
return -EIO;
}
s32 exfat_bdev_mwrite(struct super_block *sb, u64 secno, struct buffer_head *bh, u64 num_secs, s32 sync)
{
u64 count;
struct buffer_head *bh2;
FS_INFO_T *fsi = &(EXFAT_SB(sb)->fsi);
if (!fsi->bd_opened)
return -EIO;
if (secno == bh->b_blocknr) {
set_buffer_uptodate(bh);
mark_buffer_dirty(bh);
if (sync && (sync_dirty_buffer(bh) != 0))
return -EIO;
} else {
count = num_secs << sb->s_blocksize_bits;
bh2 = __getblk(sb->s_bdev, (sector_t)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:
/*
* patch 1.2.4 : reset ONCE warning message per volume.
*/
if (!(fsi->prev_eio & EXFAT_EIO_WRITE)) {
fsi->prev_eio |= EXFAT_EIO_WRITE;
exfat_log_msg(sb, KERN_ERR, "%s: No bh. I/O error.", __func__);
exfat_debug_warn_on(1);
}
return -EIO;
}
s32 exfat_bdev_sync_all(struct super_block *sb)
{
FS_INFO_T *fsi = &(EXFAT_SB(sb)->fsi);
if (!fsi->bd_opened)
return -EIO;
return sync_blockdev(sb->s_bdev);
}
/*
* Sector Read/Write Functions
*/
s32 exfat_read_sect(struct super_block *sb, u64 sec, struct buffer_head **bh, s32 read)
{
FS_INFO_T *fsi = &(EXFAT_SB(sb)->fsi);
BUG_ON(!bh);
if ((sec >= fsi->num_sectors) && (fsi->num_sectors > 0)) {
exfat_fs_error_ratelimit(sb,
"%s: out of range (sect:%llu)", __func__, sec);
return -EIO;
}
if (exfat_bdev_mread(sb, sec, bh, 1, read)) {
exfat_fs_error_ratelimit(sb,
"%s: I/O error (sect:%llu)", __func__, sec);
return -EIO;
}
return 0;
}
s32 exfat_write_sect(struct super_block *sb, u64 sec, struct buffer_head *bh, s32 sync)
{
FS_INFO_T *fsi = &(EXFAT_SB(sb)->fsi);
BUG_ON(!bh);
if ((sec >= fsi->num_sectors) && (fsi->num_sectors > 0)) {
exfat_fs_error_ratelimit(sb,
"%s: out of range (sect:%llu)", __func__, sec);
return -EIO;
}
if (exfat_bdev_mwrite(sb, sec, bh, 1, sync)) {
exfat_fs_error_ratelimit(sb, "%s: I/O error (sect:%llu)",
__func__, sec);
return -EIO;
}
return 0;
}
static inline void __blkdev_write_bhs(struct buffer_head **bhs, s32 nr_bhs)
{
s32 i;
for (i = 0; i < nr_bhs; i++)
write_dirty_buffer(bhs[i], WRITE);
}
static inline s32 __blkdev_sync_bhs(struct buffer_head **bhs, s32 nr_bhs)
{
s32 i, err = 0;
for (i = 0; i < nr_bhs; i++) {
wait_on_buffer(bhs[i]);
if (!err && !buffer_uptodate(bhs[i]))
err = -EIO;
}
return err;
}
static inline s32 __buffer_zeroed(struct super_block *sb, u64 blknr, u64 num_secs)
{
struct buffer_head *bhs[MAX_BUF_PER_PAGE];
s32 nr_bhs = MAX_BUF_PER_PAGE;
u64 last_blknr = blknr + num_secs;
s32 err, i, n;
struct blk_plug plug;
/* Zeroing the unused blocks on this cluster */
n = 0;
blk_start_plug(&plug);
while (blknr < last_blknr) {
bhs[n] = sb_getblk(sb, (sector_t)blknr);
if (!bhs[n]) {
err = -ENOMEM;
blk_finish_plug(&plug);
goto error;
}
memset(bhs[n]->b_data, 0, sb->s_blocksize);
set_buffer_uptodate(bhs[n]);
mark_buffer_dirty(bhs[n]);
n++;
blknr++;
if (blknr == last_blknr)
break;
if (n == nr_bhs) {
__blkdev_write_bhs(bhs, n);
for (i = 0; i < n; i++)
brelse(bhs[i]);
n = 0;
}
}
__blkdev_write_bhs(bhs, n);
blk_finish_plug(&plug);
err = __blkdev_sync_bhs(bhs, n);
if (err)
goto error;
for (i = 0; i < n; i++)
brelse(bhs[i]);
return 0;
error:
EMSG("%s: failed zeroed sect %llu\n", __func__, blknr);
for (i = 0; i < n; i++)
bforget(bhs[i]);
return err;
}
s32 exfat_write_msect_zero(struct super_block *sb, u64 sec, u64 num_secs)
{
FS_INFO_T *fsi = &(EXFAT_SB(sb)->fsi);
if (((sec+num_secs) > fsi->num_sectors) && (fsi->num_sectors > 0)) {
exfat_fs_error_ratelimit(sb, "%s: out of range(sect:%llu len:%llu)",
__func__, sec, num_secs);
return -EIO;
}
/* Just return -EAGAIN if it is failed */
if (__buffer_zeroed(sb, sec, num_secs))
return -EAGAIN;
return 0;
}
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