cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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io.c (1415B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 * linux/fs/befs/io.c
      4 *
      5 * Copyright (C) 2001 Will Dyson <will_dyson@pobox.com
      6 *
      7 * Based on portions of file.c and inode.c
      8 * by Makoto Kato (m_kato@ga2.so-net.ne.jp)
      9 *
     10 * Many thanks to Dominic Giampaolo, author of Practical File System
     11 * Design with the Be File System, for such a helpful book.
     12 *
     13 */
     14
     15#include <linux/buffer_head.h>
     16
     17#include "befs.h"
     18#include "io.h"
     19
     20/*
     21 * Converts befs notion of disk addr to a disk offset and uses
     22 * linux kernel function sb_bread() to get the buffer containing
     23 * the offset.
     24 */
     25
     26struct buffer_head *
     27befs_bread_iaddr(struct super_block *sb, befs_inode_addr iaddr)
     28{
     29	struct buffer_head *bh;
     30	befs_blocknr_t block;
     31	struct befs_sb_info *befs_sb = BEFS_SB(sb);
     32
     33	befs_debug(sb, "---> Enter %s "
     34		   "[%u, %hu, %hu]", __func__, iaddr.allocation_group,
     35		   iaddr.start, iaddr.len);
     36
     37	if (iaddr.allocation_group > befs_sb->num_ags) {
     38		befs_error(sb, "BEFS: Invalid allocation group %u, max is %u",
     39			   iaddr.allocation_group, befs_sb->num_ags);
     40		goto error;
     41	}
     42
     43	block = iaddr2blockno(sb, &iaddr);
     44
     45	befs_debug(sb, "%s: offset = %lu", __func__, (unsigned long)block);
     46
     47	bh = sb_bread(sb, block);
     48
     49	if (bh == NULL) {
     50		befs_error(sb, "Failed to read block %lu",
     51			   (unsigned long)block);
     52		goto error;
     53	}
     54
     55	befs_debug(sb, "<--- %s", __func__);
     56	return bh;
     57
     58error:
     59	befs_debug(sb, "<--- %s ERROR", __func__);
     60	return NULL;
     61}