4 * Copyright (C) 2001 Will Dyson <will_dyson@pobox.com
6 * Based on portions of file.c and inode.c
7 * by Makoto Kato (m_kato@ga2.so-net.ne.jp)
9 * Many thanks to Dominic Giampaolo, author of Practical File System
10 * Design with the Be File System, for such a helpful book.
14 #include <linux/buffer_head.h>
20 * Converts befs notion of disk addr to a disk offset and uses
21 * linux kernel function sb_bread() to get the buffer containing
22 * the offset. -Will Dyson
27 befs_bread_iaddr(struct super_block
*sb
, befs_inode_addr iaddr
)
29 struct buffer_head
*bh
= NULL
;
30 befs_blocknr_t block
= 0;
31 befs_sb_info
*befs_sb
= BEFS_SB(sb
);
33 befs_debug(sb
, "---> Enter befs_read_iaddr() "
35 iaddr
.allocation_group
, iaddr
.start
, iaddr
.len
);
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
);
43 block
= iaddr2blockno(sb
, &iaddr
);
45 befs_debug(sb
, "befs_read_iaddr: offset = %lu", block
);
47 bh
= sb_bread(sb
, block
);
50 befs_error(sb
, "Failed to read block %lu", block
);
54 befs_debug(sb
, "<--- befs_read_iaddr()");
58 befs_debug(sb
, "<--- befs_read_iaddr() ERROR");
63 befs_bread(struct super_block
*sb
, befs_blocknr_t block
)
65 struct buffer_head
*bh
= NULL
;
67 befs_debug(sb
, "---> Enter befs_read() %Lu", block
);
69 bh
= sb_bread(sb
, block
);
72 befs_error(sb
, "Failed to read block %lu", block
);
76 befs_debug(sb
, "<--- befs_read()");
81 befs_debug(sb
, "<--- befs_read() ERROR");
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