1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * file.c
4 *
5 * Copyright (c) 1999 Al Smith
6 *
7 * Portions derived from work (c) 1995,1996 Christian Vogelgsang.
8 */
9
10 #include <linux/buffer_head.h>
11 #include "efs.h"
12
13 int efs_get_block(struct inode *inode, sector_t iblock,
14 struct buffer_head *bh_result, int create)
15 {
16 int error = -EROFS;
17 long phys;
18
19 if (create)
20 return error;
21 if (iblock >= inode->i_blocks) {
22 #ifdef DEBUG
23 /*
24 * i have no idea why this happens as often as it does
25 */
26 pr_warn("%s(): block %d >= %ld (filesize %ld)\n",
27 __func__, block, inode->i_blocks, inode->i_size);
28 #endif
29 return 0;
30 }
31 phys = efs_map_block(inode, iblock);
32 if (phys)
33 map_bh(bh_result, inode->i_sb, phys);
34 return 0;
35 }
36
37 int efs_bmap(struct inode *inode, efs_block_t block) {
38
39 if (block < 0) {
40 pr_warn("%s(): block < 0\n", __func__);
41 return 0;
42 }
43
44 /* are we about to read past the end of a file ? */
45 if (!(block < inode->i_blocks)) {
46 #ifdef DEBUG
47 /*
48 * i have no idea why this happens as often as it does
49 */
50 pr_warn("%s(): block %d >= %ld (filesize %ld)\n",
51 __func__, block, inode->i_blocks, inode->i_size);
52 #endif
53 return 0;
54 }
55
56 return efs_map_block(inode, block);
57 }
58
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