1 /*
2 * file.c
3 *
4 * Copyright (c) 1999 Al Smith
5 *
6 * Portions derived from work (c) 1995,1996 Christian Vogelgsang.
7 */
8
9 #include <linux/efs_fs.h>
10
efs_get_block(struct inode * inode,long iblock,struct buffer_head * bh_result,int create)11 int efs_get_block(struct inode *inode, long iblock,
12 struct buffer_head *bh_result, int create)
13 {
14 int error = -EROFS;
15 long phys;
16
17 if (create)
18 return error;
19 if (iblock >= inode->i_blocks) {
20 #ifdef DEBUG
21 /*
22 * i have no idea why this happens as often as it does
23 */
24 printk(KERN_WARNING "EFS: bmap(): block %d >= %ld (filesize %ld)\n",
25 block,
26 inode->i_blocks,
27 inode->i_size);
28 #endif
29 return 0;
30 }
31 phys = efs_map_block(inode, iblock);
32 if (phys) {
33 bh_result->b_dev = inode->i_dev;
34 bh_result->b_blocknr = phys;
35 bh_result->b_state |= (1UL << BH_Mapped);
36 }
37 return 0;
38 }
39
efs_bmap(struct inode * inode,efs_block_t block)40 int efs_bmap(struct inode *inode, efs_block_t block) {
41
42 if (block < 0) {
43 printk(KERN_WARNING "EFS: bmap(): block < 0\n");
44 return 0;
45 }
46
47 /* are we about to read past the end of a file ? */
48 if (!(block < inode->i_blocks)) {
49 #ifdef DEBUG
50 /*
51 * i have no idea why this happens as often as it does
52 */
53 printk(KERN_WARNING "EFS: bmap(): block %d >= %ld (filesize %ld)\n",
54 block,
55 inode->i_blocks,
56 inode->i_size);
57 #endif
58 return 0;
59 }
60
61 return efs_map_block(inode, block);
62 }
63