xref: /openbmc/linux/fs/efs/file.c (revision b2441318)
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 
efs_get_block(struct inode * inode,sector_t iblock,struct buffer_head * bh_result,int create)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 
efs_bmap(struct inode * inode,efs_block_t block)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