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92 lines
2.3 KiB
92 lines
2.3 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* 2017 by Marek Behun <[email protected]> |
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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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