]>
git.ipfire.org Git - people/ms/u-boot.git/blob - fs/zfs/dev.c
3 * based on code of fs/reiserfs/dev.c by
5 * (C) Copyright 2003 - 2004
6 * Sysgo AG, <www.elinos.com>, Pavel Bartusek <pba@sysgo.com>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
26 #include <zfs_common.h>
28 static block_dev_desc_t
*zfs_block_dev_desc
;
29 static disk_partition_t
*part_info
;
31 void zfs_set_blk_dev(block_dev_desc_t
*rbdd
, disk_partition_t
*info
)
33 zfs_block_dev_desc
= rbdd
;
38 int zfs_devread(int sector
, int byte_offset
, int byte_len
, char *buf
)
40 short sec_buffer
[SECTOR_SIZE
/sizeof(short)];
41 char *sec_buf
= (char *)sec_buffer
;
45 * Check partition boundaries
48 ((sector
+ ((byte_offset
+ byte_len
- 1) >> SECTOR_BITS
)) >=
50 /* errnum = ERR_OUTSIDE_PART; */
51 printf(" ** zfs_devread() read outside partition sector %d\n", sector
);
56 * Get the read to the beginning of a partition.
58 sector
+= byte_offset
>> SECTOR_BITS
;
59 byte_offset
&= SECTOR_SIZE
- 1;
61 debug(" <%d, %d, %d>\n", sector
, byte_offset
, byte_len
);
63 if (zfs_block_dev_desc
== NULL
) {
64 printf("** Invalid Block Device Descriptor (NULL)\n");
68 if (byte_offset
!= 0) {
69 /* read first part which isn't aligned with start of sector */
70 if (zfs_block_dev_desc
->block_read(zfs_block_dev_desc
->dev
,
71 part_info
->start
+ sector
, 1,
72 (unsigned long *)sec_buf
) != 1) {
73 printf(" ** zfs_devread() read error **\n");
76 memcpy(buf
, sec_buf
+ byte_offset
,
77 min(SECTOR_SIZE
- byte_offset
, byte_len
));
78 buf
+= min(SECTOR_SIZE
- byte_offset
, byte_len
);
79 byte_len
-= min(SECTOR_SIZE
- byte_offset
, byte_len
);
86 /* read sector aligned part */
87 block_len
= byte_len
& ~(SECTOR_SIZE
- 1);
92 block_len
= SECTOR_SIZE
;
93 zfs_block_dev_desc
->block_read(zfs_block_dev_desc
->dev
,
94 part_info
->start
+ sector
,
95 1, (unsigned long *)p
);
96 memcpy(buf
, p
, byte_len
);
100 if (zfs_block_dev_desc
->block_read(zfs_block_dev_desc
->dev
,
101 part_info
->start
+ sector
, block_len
/ SECTOR_SIZE
,
102 (unsigned long *) buf
) != block_len
/ SECTOR_SIZE
) {
103 printf(" ** zfs_devread() read error - block\n");
107 block_len
= byte_len
& ~(SECTOR_SIZE
- 1);
109 byte_len
-= block_len
;
110 sector
+= block_len
/ SECTOR_SIZE
;
113 /* read rest of data which are not in whole sector */
114 if (zfs_block_dev_desc
->
115 block_read(zfs_block_dev_desc
->dev
,
116 part_info
->start
+ sector
, 1,
117 (unsigned long *) sec_buf
) != 1) {
118 printf(" ** zfs_devread() read error - last part\n");
121 memcpy(buf
, sec_buf
, byte_len
);