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![Tom Rini](/assets/img/avatar_default.png)
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
93 lines
2.3 KiB
C
93 lines
2.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* 2017 by Marek Behun <marek.behun@nic.cz>
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*
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* Derived from code in ext4/dev.c, which was based on reiserfs/dev.c
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*/
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#include <common.h>
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#include <compiler.h>
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#include <part.h>
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#include <memalign.h>
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int fs_devread(struct blk_desc *blk, disk_partition_t *partition,
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lbaint_t sector, int byte_offset, int byte_len, char *buf)
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{
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unsigned block_len;
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int log2blksz;
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ALLOC_CACHE_ALIGN_BUFFER(char, sec_buf, (blk ? blk->blksz : 0));
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if (blk == NULL) {
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printf("** Invalid Block Device Descriptor (NULL)\n");
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return 0;
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}
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log2blksz = blk->log2blksz;
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/* Check partition boundaries */
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if ((sector + ((byte_offset + byte_len - 1) >> log2blksz))
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>= partition->size) {
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printf("%s read outside partition " LBAFU "\n", __func__,
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sector);
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return 0;
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}
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/* Get the read to the beginning of a partition */
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sector += byte_offset >> log2blksz;
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byte_offset &= blk->blksz - 1;
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debug(" <" LBAFU ", %d, %d>\n", sector, byte_offset, byte_len);
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if (byte_offset != 0) {
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int readlen;
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/* read first part which isn't aligned with start of sector */
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if (blk_dread(blk, partition->start + sector, 1,
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(void *)sec_buf) != 1) {
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printf(" ** %s read error **\n", __func__);
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return 0;
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}
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readlen = min((int)blk->blksz - byte_offset,
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byte_len);
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memcpy(buf, sec_buf + byte_offset, readlen);
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buf += readlen;
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byte_len -= readlen;
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sector++;
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}
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if (byte_len == 0)
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return 1;
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/* read sector aligned part */
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block_len = byte_len & ~(blk->blksz - 1);
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if (block_len == 0) {
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ALLOC_CACHE_ALIGN_BUFFER(u8, p, blk->blksz);
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block_len = blk->blksz;
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blk_dread(blk, partition->start + sector, 1,
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(void *)p);
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memcpy(buf, p, byte_len);
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return 1;
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}
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if (blk_dread(blk, partition->start + sector,
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block_len >> log2blksz, (void *)buf) !=
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block_len >> log2blksz) {
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printf(" ** %s read error - block\n", __func__);
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return 0;
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}
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block_len = byte_len & ~(blk->blksz - 1);
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buf += block_len;
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byte_len -= block_len;
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sector += block_len / blk->blksz;
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if (byte_len != 0) {
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/* read rest of data which are not in whole sector */
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if (blk_dread(blk, partition->start + sector, 1,
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(void *)sec_buf) != 1) {
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printf("* %s read error - last part\n", __func__);
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return 0;
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}
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memcpy(buf, sec_buf, byte_len);
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}
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return 1;
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}
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