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 vfs_blocknr_t vfs_block = 0;
32 befs_sb_info *befs_sb = BEFS_SB(sb);
34 befs_debug(sb, "---> Enter befs_read_iaddr() "
36 iaddr.allocation_group, iaddr.start, iaddr.len);
38 if (iaddr.allocation_group > befs_sb->num_ags) {
39 befs_error(sb, "BEFS: Invalid allocation group %u, max is %u",
40 iaddr.allocation_group, befs_sb->num_ags);
44 block = iaddr2blockno(sb, &iaddr);
45 vfs_block = (vfs_blocknr_t) block;
47 if (vfs_block != block) {
48 befs_error(sb, "Error converting to host blocknr_t. %Lu "
49 "is larger than the host can use", block);
53 befs_debug(sb, "befs_read_iaddr: offset = %lu", block);
55 bh = sb_bread(sb, vfs_block);
58 befs_error(sb, "Failed to read block %lu", block);
62 befs_debug(sb, "<--- befs_read_iaddr()");
66 befs_debug(sb, "<--- befs_read_iaddr() ERROR");
71 befs_bread(struct super_block *sb, befs_blocknr_t block)
73 struct buffer_head *bh = NULL;
74 vfs_blocknr_t vfs_block = (vfs_blocknr_t) block;
76 befs_debug(sb, "---> Enter befs_read() %Lu", block);
78 if (vfs_block != block) {
79 befs_error(sb, "Error converting to host blocknr_t. %Lu "
80 "is larger than the host can use", block);
84 bh = sb_bread(sb, vfs_block);
87 befs_error(sb, "Failed to read block %lu", vfs_block);
91 befs_debug(sb, "<--- befs_read()");
96 befs_debug(sb, "<--- befs_read() ERROR");