84 lines
1.8 KiB
C
84 lines
1.8 KiB
C
|
/*
|
||
|
|
* linux/fs/befs/io.c
|
||
|
|
*
|
||
|
|
* Copyright (C) 2001 Will Dyson <will_dyson@pobox.com
|
||
|
|
*
|
||
|
|
* Based on portions of file.c and inode.c
|
||
|
|
* by Makoto Kato (m_kato@ga2.so-net.ne.jp)
|
||
|
|
*
|
||
|
|
* Many thanks to Dominic Giampaolo, author of Practical File System
|
||
|
|
* Design with the Be File System, for such a helpful book.
|
||
|
|
*
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <linux/buffer_head.h>
|
||
|
|
|
||
|
|
#include "befs.h"
|
||
|
|
#include "io.h"
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Converts befs notion of disk addr to a disk offset and uses
|
||
|
|
* linux kernel function sb_bread() to get the buffer containing
|
||
|
|
* the offset. -Will Dyson
|
||
|
|
*
|
||
|
|
*/
|
||
|
|
|
||
|
|
struct buffer_head *
|
||
|
|
befs_bread_iaddr(struct super_block *sb, befs_inode_addr iaddr)
|
||
|
|
{
|
||
|
|
struct buffer_head *bh = NULL;
|
||
|
|
befs_blocknr_t block = 0;
|
||
|
|
befs_sb_info *befs_sb = BEFS_SB(sb);
|
||
|
|
|
||
|
|
befs_debug(sb, "---> Enter befs_read_iaddr() "
|
||
|
|
"[%u, %hu, %hu]",
|
||
|
|
iaddr.allocation_group, iaddr.start, iaddr.len);
|
||
|
|
|
||
|
|
if (iaddr.allocation_group > befs_sb->num_ags) {
|
||
|
|
befs_error(sb, "BEFS: Invalid allocation group %u, max is %u",
|
||
|
|
iaddr.allocation_group, befs_sb->num_ags);
|
||
|
|
goto error;
|
||
|
|
}
|
||
|
|
|
||
|
|
block = iaddr2blockno(sb, &iaddr);
|
||
|
|
|
||
|
|
befs_debug(sb, "befs_read_iaddr: offset = %lu", block);
|
||
|
|
|
||
|
|
bh = sb_bread(sb, block);
|
||
|
|
|
||
|
|
if (bh == NULL) {
|
||
|
|
befs_error(sb, "Failed to read block %lu", block);
|
||
|
|
goto error;
|
||
|
|
}
|
||
|
|
|
||
|
|
befs_debug(sb, "<--- befs_read_iaddr()");
|
||
|
|
return bh;
|
||
|
|
|
||
|
|
error:
|
||
|
|
befs_debug(sb, "<--- befs_read_iaddr() ERROR");
|
||
|
|
return NULL;
|
||
|
|
}
|
||
|
|
|
||
|
|
struct buffer_head *
|
||
|
|
befs_bread(struct super_block *sb, befs_blocknr_t block)
|
||
|
|
{
|
||
|
|
struct buffer_head *bh = NULL;
|
||
|
|
|
||
|
|
befs_debug(sb, "---> Enter befs_read() %Lu", block);
|
||
|
|
|
||
|
|
bh = sb_bread(sb, block);
|
||
|
|
|
||
|
|
if (bh == NULL) {
|
||
|
|
befs_error(sb, "Failed to read block %lu", block);
|
||
|
|
goto error;
|
||
|
|
}
|
||
|
|
|
||
|
|
befs_debug(sb, "<--- befs_read()");
|
||
|
|
|
||
|
|
return bh;
|
||
|
|
|
||
|
|
error:
|
||
|
|
befs_debug(sb, "<--- befs_read() ERROR");
|
||
|
|
return NULL;
|
||
|
|
}
|