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Tom Rini83d290c2018-05-06 17:58:06 -04001// SPDX-License-Identifier: GPL-2.0
Marek Behún5994e8b2017-09-03 17:00:24 +02002/*
Marek Behún61143f72022-06-01 17:17:06 +02003 * 2017 by Marek Behún <kabel@kernel.org>
Marek Behún5994e8b2017-09-03 17:00:24 +02004 *
5 * Derived from code in ext4/dev.c, which was based on reiserfs/dev.c
Marek Behún5994e8b2017-09-03 17:00:24 +02006 */
7
Heinrich Schuchardt0d32d8c2020-08-25 17:49:16 +00008#define LOG_CATEGORY LOGC_CORE
9
Marek Behún5994e8b2017-09-03 17:00:24 +020010#include <common.h>
Simon Glasse6f6f9e2020-05-10 11:39:58 -060011#include <blk.h>
Marek Behún5994e8b2017-09-03 17:00:24 +020012#include <compiler.h>
Simon Glassf7ae49f2020-05-10 11:40:05 -060013#include <log.h>
Marek Behún5994e8b2017-09-03 17:00:24 +020014#include <part.h>
15#include <memalign.h>
16
Simon Glass05289792020-05-10 11:39:57 -060017int fs_devread(struct blk_desc *blk, struct disk_partition *partition,
Marek Behún5994e8b2017-09-03 17:00:24 +020018 lbaint_t sector, int byte_offset, int byte_len, char *buf)
19{
20 unsigned block_len;
Heinrich Schuchardt24f48412017-11-19 23:49:21 +010021 int log2blksz;
Marek Behún5994e8b2017-09-03 17:00:24 +020022 ALLOC_CACHE_ALIGN_BUFFER(char, sec_buf, (blk ? blk->blksz : 0));
23 if (blk == NULL) {
Heinrich Schuchardt0d32d8c2020-08-25 17:49:16 +000024 log_err("** Invalid Block Device Descriptor (NULL)\n");
Marek Behún5994e8b2017-09-03 17:00:24 +020025 return 0;
26 }
Heinrich Schuchardt24f48412017-11-19 23:49:21 +010027 log2blksz = blk->log2blksz;
Marek Behún5994e8b2017-09-03 17:00:24 +020028
29 /* Check partition boundaries */
30 if ((sector + ((byte_offset + byte_len - 1) >> log2blksz))
31 >= partition->size) {
Simon Glassf337fb92022-10-11 09:47:11 -060032 log_debug("read outside partition " LBAFU "\n", sector);
Marek Behún5994e8b2017-09-03 17:00:24 +020033 return 0;
34 }
35
36 /* Get the read to the beginning of a partition */
37 sector += byte_offset >> log2blksz;
38 byte_offset &= blk->blksz - 1;
39
Heinrich Schuchardt0d32d8c2020-08-25 17:49:16 +000040 log_debug(" <" LBAFU ", %d, %d>\n", sector, byte_offset, byte_len);
Marek Behún5994e8b2017-09-03 17:00:24 +020041
42 if (byte_offset != 0) {
43 int readlen;
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) {
Heinrich Schuchardt0d32d8c2020-08-25 17:49:16 +000047 log_err(" ** %s read error **\n", __func__);
Marek Behún5994e8b2017-09-03 17:00:24 +020048 return 0;
49 }
50 readlen = min((int)blk->blksz - byte_offset,
51 byte_len);
52 memcpy(buf, sec_buf + byte_offset, readlen);
53 buf += readlen;
54 byte_len -= readlen;
55 sector++;
56 }
57
58 if (byte_len == 0)
59 return 1;
60
61 /* read sector aligned part */
62 block_len = byte_len & ~(blk->blksz - 1);
63
64 if (block_len == 0) {
65 ALLOC_CACHE_ALIGN_BUFFER(u8, p, blk->blksz);
66
67 block_len = blk->blksz;
68 blk_dread(blk, partition->start + sector, 1,
69 (void *)p);
70 memcpy(buf, p, byte_len);
71 return 1;
72 }
73
74 if (blk_dread(blk, partition->start + sector,
75 block_len >> log2blksz, (void *)buf) !=
76 block_len >> log2blksz) {
Heinrich Schuchardt0d32d8c2020-08-25 17:49:16 +000077 log_err(" ** %s read error - block\n", __func__);
Marek Behún5994e8b2017-09-03 17:00:24 +020078 return 0;
79 }
80 block_len = byte_len & ~(blk->blksz - 1);
81 buf += block_len;
82 byte_len -= block_len;
83 sector += block_len / blk->blksz;
84
85 if (byte_len != 0) {
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) {
Heinrich Schuchardt0d32d8c2020-08-25 17:49:16 +000089 log_err("* %s read error - last part\n", __func__);
Marek Behún5994e8b2017-09-03 17:00:24 +020090 return 0;
91 }
92 memcpy(buf, sec_buf, byte_len);
93 }
94 return 1;
95}