xref: /openbmc/u-boot/fs/reiserfs/dev.c (revision 8b0044ff)
1 /*
2  *  (C) Copyright 2003 - 2004
3  *  Sysgo AG, <www.elinos.com>, Pavel Bartusek <pba@sysgo.com>
4  *
5  * SPDX-License-Identifier:	GPL-2.0+
6  */
7 
8 
9 #include <common.h>
10 #include <config.h>
11 #include <reiserfs.h>
12 
13 #include "reiserfs_private.h"
14 
15 static block_dev_desc_t *reiserfs_block_dev_desc;
16 static disk_partition_t *part_info;
17 
18 
19 void reiserfs_set_blk_dev(block_dev_desc_t *rbdd, disk_partition_t *info)
20 {
21 	reiserfs_block_dev_desc = rbdd;
22 	part_info = info;
23 }
24 
25 
26 int reiserfs_devread (int sector, int byte_offset, int byte_len, char *buf)
27 {
28 	char sec_buf[SECTOR_SIZE];
29 	unsigned block_len;
30 /*
31 	unsigned len = byte_len;
32 	u8 *start = buf;
33 */
34 	/*
35 	*  Check partition boundaries
36 	*/
37 	if (sector < 0
38 	    || ((sector + ((byte_offset + byte_len - 1) >> SECTOR_BITS))
39 	    >= part_info->size)) {
40 /*		errnum = ERR_OUTSIDE_PART; */
41 		printf (" ** reiserfs_devread() read outside partition\n");
42 		return 0;
43 	}
44 
45 	/*
46 	 *  Get the read to the beginning of a partition.
47 	 */
48 	sector += byte_offset >> SECTOR_BITS;
49 	byte_offset &= SECTOR_SIZE - 1;
50 
51 #if defined(DEBUG)
52 	printf (" <%d, %d, %d> ", sector, byte_offset, byte_len);
53 #endif
54 
55 
56 	if (reiserfs_block_dev_desc == NULL)
57 		return 0;
58 
59 
60 	if (byte_offset != 0) {
61 		/* read first part which isn't aligned with start of sector */
62 		if (reiserfs_block_dev_desc->block_read(reiserfs_block_dev_desc->dev,
63 		    part_info->start + sector, 1,
64 		    (unsigned long *)sec_buf) != 1) {
65 			printf (" ** reiserfs_devread() read error\n");
66 			return 0;
67 		}
68 		memcpy(buf, sec_buf+byte_offset, min(SECTOR_SIZE-byte_offset, byte_len));
69 		buf+=min(SECTOR_SIZE-byte_offset, byte_len);
70 		byte_len-=min(SECTOR_SIZE-byte_offset, byte_len);
71 		sector++;
72 	}
73 
74 	/* read sector aligned part */
75 	block_len = byte_len & ~(SECTOR_SIZE-1);
76 	if (reiserfs_block_dev_desc->block_read(reiserfs_block_dev_desc->dev,
77 	    part_info->start + sector, block_len/SECTOR_SIZE,
78 	    (unsigned long *)buf) != block_len/SECTOR_SIZE) {
79 		printf (" ** reiserfs_devread() read error - block\n");
80 		return 0;
81 	}
82 	buf+=block_len;
83 	byte_len-=block_len;
84 	sector+= block_len/SECTOR_SIZE;
85 
86 	if ( byte_len != 0 ) {
87 		/* read rest of data which are not in whole sector */
88 		if (reiserfs_block_dev_desc->block_read(reiserfs_block_dev_desc->dev,
89 		    part_info->start + sector, 1,
90 		    (unsigned long *)sec_buf) != 1) {
91 			printf (" ** reiserfs_devread() read error - last part\n");
92 			return 0;
93 		}
94 		memcpy(buf, sec_buf, byte_len);
95 	}
96 
97 	return 1;
98 }
99