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61 lines
1.4 KiB
61 lines
1.4 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* linux/fs/befs/io.c |
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* |
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* Copyright (C) 2001 Will Dyson <[email protected] |
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* |
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* Based on portions of file.c and inode.c |
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* by Makoto Kato ([email protected]) |
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* |
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* Many thanks to Dominic Giampaolo, author of Practical File System |
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* Design with the Be File System, for such a helpful book. |
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* |
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*/ |
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#include <linux/buffer_head.h> |
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#include "befs.h" |
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#include "io.h" |
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/* |
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* Converts befs notion of disk addr to a disk offset and uses |
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* linux kernel function sb_bread() to get the buffer containing |
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* the offset. |
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*/ |
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struct buffer_head * |
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befs_bread_iaddr(struct super_block *sb, befs_inode_addr iaddr) |
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{ |
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struct buffer_head *bh; |
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befs_blocknr_t block; |
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struct befs_sb_info *befs_sb = BEFS_SB(sb); |
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befs_debug(sb, "---> Enter %s " |
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"[%u, %hu, %hu]", __func__, iaddr.allocation_group, |
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iaddr.start, iaddr.len); |
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if (iaddr.allocation_group > befs_sb->num_ags) { |
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befs_error(sb, "BEFS: Invalid allocation group %u, max is %u", |
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iaddr.allocation_group, befs_sb->num_ags); |
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goto error; |
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} |
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block = iaddr2blockno(sb, &iaddr); |
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befs_debug(sb, "%s: offset = %lu", __func__, (unsigned long)block); |
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bh = sb_bread(sb, block); |
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if (bh == NULL) { |
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befs_error(sb, "Failed to read block %lu", |
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(unsigned long)block); |
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goto error; |
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} |
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befs_debug(sb, "<--- %s", __func__); |
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return bh; |
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error: |
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befs_debug(sb, "<--- %s ERROR", __func__); |
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return NULL; |
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}
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