]>
git.ipfire.org Git - people/ms/u-boot.git/blob - fs/reiserfs/dev.c
2 * (C) Copyright 2003 - 2004
3 * Sysgo AG, <www.elinos.com>, Pavel Bartusek <pba@sysgo.com>
5 * SPDX-License-Identifier: GPL-2.0+
13 #include "reiserfs_private.h"
15 static block_dev_desc_t
*reiserfs_block_dev_desc
;
16 static disk_partition_t
*part_info
;
19 void reiserfs_set_blk_dev(block_dev_desc_t
*rbdd
, disk_partition_t
*info
)
21 reiserfs_block_dev_desc
= rbdd
;
26 int reiserfs_devread (int sector
, int byte_offset
, int byte_len
, char *buf
)
28 char sec_buf
[SECTOR_SIZE
];
31 unsigned len = byte_len;
35 * Check partition boundaries
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");
46 * Get the read to the beginning of a partition.
48 sector
+= byte_offset
>> SECTOR_BITS
;
49 byte_offset
&= SECTOR_SIZE
- 1;
52 printf (" <%d, %d, %d> ", sector
, byte_offset
, byte_len
);
56 if (reiserfs_block_dev_desc
== NULL
)
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");
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
);
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");
84 sector
+= block_len
/SECTOR_SIZE
;
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");
94 memcpy(buf
, sec_buf
, byte_len
);