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1// SPDX-License-Identifier: GPL-2.02/*3 * linux/fs/befs/io.c4 *5 * Copyright (C) 2001 Will Dyson <will_dyson@pobox.com6 *7 * Based on portions of file.c and inode.c8 * by Makoto Kato (m_kato@ga2.so-net.ne.jp)9 *10 * Many thanks to Dominic Giampaolo, author of Practical File System11 * 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 uses22 * linux kernel function sb_bread() to get the buffer containing23 * 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}62