]>
git.ipfire.org Git - thirdparty/u-boot.git/blob - fs/fs_internal.c
1 // SPDX-License-Identifier: GPL-2.0
3 * 2017 by Marek BehĂșn <kabel@kernel.org>
5 * Derived from code in ext4/dev.c, which was based on reiserfs/dev.c
8 #define LOG_CATEGORY LOGC_CORE
17 int fs_devread(struct blk_desc
*blk
, struct disk_partition
*partition
,
18 lbaint_t sector
, int byte_offset
, int byte_len
, char *buf
)
22 ALLOC_CACHE_ALIGN_BUFFER(char, sec_buf
, (blk
? blk
->blksz
: 0));
24 log_err("** Invalid Block Device Descriptor (NULL)\n");
27 log2blksz
= blk
->log2blksz
;
29 /* Check partition boundaries */
30 if ((sector
+ ((byte_offset
+ byte_len
- 1) >> log2blksz
))
32 log_debug("read outside partition " LBAFU
"\n", sector
);
36 /* Get the read to the beginning of a partition */
37 sector
+= byte_offset
>> log2blksz
;
38 byte_offset
&= blk
->blksz
- 1;
40 log_debug(" <" LBAFU
", %d, %d>\n", sector
, byte_offset
, byte_len
);
42 if (byte_offset
!= 0) {
44 /* read first part which isn't aligned with start of sector */
45 if (blk_dread(blk
, partition
->start
+ sector
, 1,
46 (void *)sec_buf
) != 1) {
47 log_err(" ** %s read error **\n", __func__
);
50 readlen
= min((int)blk
->blksz
- byte_offset
,
52 memcpy(buf
, sec_buf
+ byte_offset
, readlen
);
61 /* read sector aligned part */
62 block_len
= byte_len
& ~(blk
->blksz
- 1);
65 ALLOC_CACHE_ALIGN_BUFFER(u8
, p
, blk
->blksz
);
67 block_len
= blk
->blksz
;
68 blk_dread(blk
, partition
->start
+ sector
, 1,
70 memcpy(buf
, p
, byte_len
);
74 if (blk_dread(blk
, partition
->start
+ sector
,
75 block_len
>> log2blksz
, (void *)buf
) !=
76 block_len
>> log2blksz
) {
77 log_err(" ** %s read error - block\n", __func__
);
80 block_len
= byte_len
& ~(blk
->blksz
- 1);
82 byte_len
-= block_len
;
83 sector
+= block_len
/ blk
->blksz
;
86 /* read rest of data which are not in whole sector */
87 if (blk_dread(blk
, partition
->start
+ sector
, 1,
88 (void *)sec_buf
) != 1) {
89 log_err("* %s read error - last part\n", __func__
);
92 memcpy(buf
, sec_buf
, byte_len
);