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518e2e1a WD |
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> | |
518e2e1a WD |
22 | #include <config.h> |
23 | #include <reiserfs.h> | |
24 | ||
25 | #include "reiserfs_private.h" | |
26 | ||
27 | static block_dev_desc_t *reiserfs_block_dev_desc; | |
650f3664 | 28 | static disk_partition_t *part_info; |
518e2e1a WD |
29 | |
30 | ||
650f3664 | 31 | void reiserfs_set_blk_dev(block_dev_desc_t *rbdd, disk_partition_t *info) |
518e2e1a WD |
32 | { |
33 | reiserfs_block_dev_desc = rbdd; | |
650f3664 | 34 | part_info = info; |
518e2e1a WD |
35 | } |
36 | ||
37 | ||
38 | int reiserfs_devread (int sector, int byte_offset, int byte_len, char *buf) | |
39 | { | |
40 | char sec_buf[SECTOR_SIZE]; | |
41 | unsigned block_len; | |
42 | /* | |
43 | unsigned len = byte_len; | |
44 | u8 *start = buf; | |
45 | */ | |
46 | /* | |
47 | * Check partition boundaries | |
48 | */ | |
49 | if (sector < 0 | |
50 | || ((sector + ((byte_offset + byte_len - 1) >> SECTOR_BITS)) | |
650f3664 | 51 | >= part_info->size)) { |
b79a11cc | 52 | /* errnum = ERR_OUTSIDE_PART; */ |
518e2e1a WD |
53 | printf (" ** reiserfs_devread() read outside partition\n"); |
54 | return 0; | |
55 | } | |
56 | ||
57 | /* | |
58 | * Get the read to the beginning of a partition. | |
59 | */ | |
60 | sector += byte_offset >> SECTOR_BITS; | |
61 | byte_offset &= SECTOR_SIZE - 1; | |
62 | ||
63 | #if defined(DEBUG) | |
64 | printf (" <%d, %d, %d> ", sector, byte_offset, byte_len); | |
65 | #endif | |
66 | ||
67 | ||
68 | if (reiserfs_block_dev_desc == NULL) | |
69 | return 0; | |
70 | ||
71 | ||
72 | if (byte_offset != 0) { | |
73 | /* read first part which isn't aligned with start of sector */ | |
74 | if (reiserfs_block_dev_desc->block_read(reiserfs_block_dev_desc->dev, | |
650f3664 RH |
75 | part_info->start + sector, 1, |
76 | (unsigned long *)sec_buf) != 1) { | |
518e2e1a WD |
77 | printf (" ** reiserfs_devread() read error\n"); |
78 | return 0; | |
79 | } | |
80 | memcpy(buf, sec_buf+byte_offset, min(SECTOR_SIZE-byte_offset, byte_len)); | |
81 | buf+=min(SECTOR_SIZE-byte_offset, byte_len); | |
82 | byte_len-=min(SECTOR_SIZE-byte_offset, byte_len); | |
83 | sector++; | |
84 | } | |
85 | ||
86 | /* read sector aligned part */ | |
87 | block_len = byte_len & ~(SECTOR_SIZE-1); | |
88 | if (reiserfs_block_dev_desc->block_read(reiserfs_block_dev_desc->dev, | |
650f3664 RH |
89 | part_info->start + sector, block_len/SECTOR_SIZE, |
90 | (unsigned long *)buf) != block_len/SECTOR_SIZE) { | |
518e2e1a WD |
91 | printf (" ** reiserfs_devread() read error - block\n"); |
92 | return 0; | |
93 | } | |
94 | buf+=block_len; | |
95 | byte_len-=block_len; | |
96 | sector+= block_len/SECTOR_SIZE; | |
97 | ||
98 | if ( byte_len != 0 ) { | |
99 | /* read rest of data which are not in whole sector */ | |
100 | if (reiserfs_block_dev_desc->block_read(reiserfs_block_dev_desc->dev, | |
650f3664 RH |
101 | part_info->start + sector, 1, |
102 | (unsigned long *)sec_buf) != 1) { | |
518e2e1a WD |
103 | printf (" ** reiserfs_devread() read error - last part\n"); |
104 | return 0; | |
105 | } | |
106 | memcpy(buf, sec_buf, byte_len); | |
107 | } | |
108 | ||
109 | return 1; | |
110 | } |