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1 /*
2  *  (C) Copyright 2003 - 2004
3  *  Sysgo AG, <www.elinos.com>, Pavel Bartusek <pba@sysgo.com>
4  *
5  *  This program is free software; you can redistribute it and/or modify
6  *  it under the terms of the GNU General Public License as published by
7  *  the Free Software Foundation; either version 2 of the License, or
8  *  (at your option) any later version.
9  *
10  *  This program is distributed in the hope that it will be useful,
11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13  *  GNU General Public License for more details.
14  *
15  *  You should have received a copy of the GNU General Public License
16  *  along with this program; if not, write to the Free Software
17  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
18  */
19
20
21 #include <common.h>
22 #if defined(CONFIG_CMD_REISER)
23
24 #include <config.h>
25 #include <reiserfs.h>
26
27 #include "reiserfs_private.h"
28
29 static block_dev_desc_t *reiserfs_block_dev_desc;
30 static disk_partition_t part_info;
31
32
33 int reiserfs_set_blk_dev(block_dev_desc_t *rbdd, int part)
34 {
35         reiserfs_block_dev_desc = rbdd;
36
37         if (part == 0) {
38                 /* disk doesn't use partition table */
39                 part_info.start = 0;
40                 part_info.size = rbdd->lba;
41                 part_info.blksz = rbdd->blksz;
42         } else {
43                 if (get_partition_info (reiserfs_block_dev_desc, part, &part_info)) {
44                         return 0;
45                 }
46         }
47         return (part_info.size);
48 }
49
50
51 int reiserfs_devread (int sector, int byte_offset, int byte_len, char *buf)
52 {
53         char sec_buf[SECTOR_SIZE];
54         unsigned block_len;
55 /*
56         unsigned len = byte_len;
57         u8 *start = buf;
58 */
59         /*
60         *  Check partition boundaries
61         */
62         if (sector < 0
63             || ((sector + ((byte_offset + byte_len - 1) >> SECTOR_BITS))
64             >= part_info.size)) {
65 /*              errnum = ERR_OUTSIDE_PART; */
66                 printf (" ** reiserfs_devread() read outside partition\n");
67                 return 0;
68         }
69
70         /*
71          *  Get the read to the beginning of a partition.
72          */
73         sector += byte_offset >> SECTOR_BITS;
74         byte_offset &= SECTOR_SIZE - 1;
75
76 #if defined(DEBUG)
77         printf (" <%d, %d, %d> ", sector, byte_offset, byte_len);
78 #endif
79
80
81         if (reiserfs_block_dev_desc == NULL)
82                 return 0;
83
84
85         if (byte_offset != 0) {
86                 /* read first part which isn't aligned with start of sector */
87                 if (reiserfs_block_dev_desc->block_read(reiserfs_block_dev_desc->dev,
88                     part_info.start+sector, 1, (unsigned long *)sec_buf) != 1) {
89                         printf (" ** reiserfs_devread() read error\n");
90                         return 0;
91                 }
92                 memcpy(buf, sec_buf+byte_offset, min(SECTOR_SIZE-byte_offset, byte_len));
93                 buf+=min(SECTOR_SIZE-byte_offset, byte_len);
94                 byte_len-=min(SECTOR_SIZE-byte_offset, byte_len);
95                 sector++;
96         }
97
98         /* read sector aligned part */
99         block_len = byte_len & ~(SECTOR_SIZE-1);
100         if (reiserfs_block_dev_desc->block_read(reiserfs_block_dev_desc->dev,
101             part_info.start+sector, block_len/SECTOR_SIZE, (unsigned long *)buf) !=
102             block_len/SECTOR_SIZE) {
103                 printf (" ** reiserfs_devread() read error - block\n");
104                 return 0;
105         }
106         buf+=block_len;
107         byte_len-=block_len;
108         sector+= block_len/SECTOR_SIZE;
109
110         if ( byte_len != 0 ) {
111                 /* read rest of data which are not in whole sector */
112                 if (reiserfs_block_dev_desc->block_read(reiserfs_block_dev_desc->dev,
113                     part_info.start+sector, 1, (unsigned long *)sec_buf) != 1) {
114                         printf (" ** reiserfs_devread() read error - last part\n");
115                         return 0;
116                 }
117                 memcpy(buf, sec_buf, byte_len);
118         }
119
120         return 1;
121 }
122
123 #endif