1 /*
2 * linux/fs/befs/io.c
3 *
4 * Copyright (C) 2001 Will Dyson <will_dyson@pobox.com
5 *
6 * Based on portions of file.c and inode.c
7 * by Makoto Kato (m_kato@ga2.so-net.ne.jp)
8 *
9 * Many thanks to Dominic Giampaolo, author of Practical File System
10 * Design with the Be File System, for such a helpful book.
11 *
12 */
13
14 #include <linux/buffer_head.h>
15
16 #include "befs.h"
17 #include "io.h"
18
19 /*
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
23 *
24 */
25
26 struct buffer_head *
27 befs_bread_iaddr(struct super_block *sb, befs_inode_addr iaddr)
28 {
29 struct buffer_head *bh = NULL;
30 befs_blocknr_t block = 0;
31 befs_sb_info *befs_sb = BEFS_SB(sb);
32
33 befs_debug(sb, "---> Enter befs_read_iaddr() "
34 "[%u, %hu, %hu]",
35 iaddr.allocation_group, 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, "befs_read_iaddr: offset = %lu", block);
46
47 bh = sb_bread(sb, block);
48
49 if (bh == NULL) {
50 befs_error(sb, "Failed to read block %lu", block);
51 goto error;
52 }
53
54 befs_debug(sb, "<--- befs_read_iaddr()");
55 return bh;
56
57 error:
58 befs_debug(sb, "<--- befs_read_iaddr() ERROR");
59 return NULL;
60 }
61
62 struct buffer_head *
63 befs_bread(struct super_block *sb, befs_blocknr_t block)
64 {
65 struct buffer_head *bh = NULL;
66
67 befs_debug(sb, "---> Enter befs_read() %Lu", block);
68
69 bh = sb_bread(sb, block);
70
71 if (bh == NULL) {
72 befs_error(sb, "Failed to read block %lu", block);
73 goto error;
74 }
75
76 befs_debug(sb, "<--- befs_read()");
77
78 return bh;
79
80 error:
81 befs_debug(sb, "<--- befs_read() ERROR");
82 return NULL;
83 }
84
|
This page was automatically generated by the
LXR engine.
|