]>
git.ipfire.org Git - people/ms/u-boot.git/blob - fs/fs_internal.c
2 * 2017 by Marek Behun <marek.behun@nic.cz>
4 * Derived from code in ext4/dev.c, which was based on reiserfs/dev.c
6 * SPDX-License-Identifier: GPL-2.0
14 int fs_devread(struct blk_desc
*blk
, disk_partition_t
*partition
,
15 lbaint_t sector
, int byte_offset
, int byte_len
, char *buf
)
19 ALLOC_CACHE_ALIGN_BUFFER(char, sec_buf
, (blk
? blk
->blksz
: 0));
21 printf("** Invalid Block Device Descriptor (NULL)\n");
24 log2blksz
= blk
->log2blksz
;
26 /* Check partition boundaries */
27 if ((sector
+ ((byte_offset
+ byte_len
- 1) >> log2blksz
))
29 printf("%s read outside partition " LBAFU
"\n", __func__
,
34 /* Get the read to the beginning of a partition */
35 sector
+= byte_offset
>> log2blksz
;
36 byte_offset
&= blk
->blksz
- 1;
38 debug(" <" LBAFU
", %d, %d>\n", sector
, byte_offset
, byte_len
);
40 if (byte_offset
!= 0) {
42 /* read first part which isn't aligned with start of sector */
43 if (blk_dread(blk
, partition
->start
+ sector
, 1,
44 (void *)sec_buf
) != 1) {
45 printf(" ** %s read error **\n", __func__
);
48 readlen
= min((int)blk
->blksz
- byte_offset
,
50 memcpy(buf
, sec_buf
+ byte_offset
, readlen
);
59 /* read sector aligned part */
60 block_len
= byte_len
& ~(blk
->blksz
- 1);
63 ALLOC_CACHE_ALIGN_BUFFER(u8
, p
, blk
->blksz
);
65 block_len
= blk
->blksz
;
66 blk_dread(blk
, partition
->start
+ sector
, 1,
68 memcpy(buf
, p
, byte_len
);
72 if (blk_dread(blk
, partition
->start
+ sector
,
73 block_len
>> log2blksz
, (void *)buf
) !=
74 block_len
>> log2blksz
) {
75 printf(" ** %s read error - block\n", __func__
);
78 block_len
= byte_len
& ~(blk
->blksz
- 1);
80 byte_len
-= block_len
;
81 sector
+= block_len
/ blk
->blksz
;
84 /* read rest of data which are not in whole sector */
85 if (blk_dread(blk
, partition
->start
+ sector
, 1,
86 (void *)sec_buf
) != 1) {
87 printf("* %s read error - last part\n", __func__
);
90 memcpy(buf
, sec_buf
, byte_len
);