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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 }