forked from rrcarlosr/Jetpack
112 lines
2.6 KiB
C
112 lines
2.6 KiB
C
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/*
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*
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* based on code of fs/reiserfs/dev.c by
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*
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* (C) Copyright 2003 - 2004
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* Sysgo AG, <www.elinos.com>, Pavel Bartusek <pba@sysgo.com>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <config.h>
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#include <zfs_common.h>
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static struct blk_desc *zfs_blk_desc;
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static disk_partition_t *part_info;
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void zfs_set_blk_dev(struct blk_desc *rbdd, disk_partition_t *info)
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{
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zfs_blk_desc = rbdd;
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part_info = info;
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}
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/* err */
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int zfs_devread(int sector, int byte_offset, int byte_len, char *buf)
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{
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short sec_buffer[SECTOR_SIZE/sizeof(short)];
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char *sec_buf = (char *)sec_buffer;
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unsigned block_len;
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/*
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* Check partition boundaries
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*/
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if ((sector < 0) ||
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((sector + ((byte_offset + byte_len - 1) >> SECTOR_BITS)) >=
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part_info->size)) {
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/* errnum = ERR_OUTSIDE_PART; */
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printf(" ** zfs_devread() read outside partition sector %d\n", sector);
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return 1;
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}
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/*
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* Get the read to the beginning of a partition.
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*/
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sector += byte_offset >> SECTOR_BITS;
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byte_offset &= SECTOR_SIZE - 1;
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debug(" <%d, %d, %d>\n", sector, byte_offset, byte_len);
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if (zfs_blk_desc == NULL) {
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printf("** Invalid Block Device Descriptor (NULL)\n");
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return 1;
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}
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if (byte_offset != 0) {
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/* read first part which isn't aligned with start of sector */
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if (zfs_blk_desc->block_read(zfs_blk_desc,
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part_info->start + sector, 1,
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(void *)sec_buf) != 1) {
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printf(" ** zfs_devread() read error **\n");
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return 1;
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}
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memcpy(buf, sec_buf + byte_offset,
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min(SECTOR_SIZE - byte_offset, byte_len));
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buf += min(SECTOR_SIZE - byte_offset, byte_len);
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byte_len -= min(SECTOR_SIZE - byte_offset, byte_len);
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sector++;
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}
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if (byte_len == 0)
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return 0;
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/* read sector aligned part */
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block_len = byte_len & ~(SECTOR_SIZE - 1);
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if (block_len == 0) {
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u8 p[SECTOR_SIZE];
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block_len = SECTOR_SIZE;
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zfs_blk_desc->block_read(zfs_blk_desc,
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part_info->start + sector,
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1, (void *)p);
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memcpy(buf, p, byte_len);
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return 0;
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}
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if (zfs_blk_desc->block_read(zfs_blk_desc, part_info->start + sector,
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block_len / SECTOR_SIZE,
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(void *)buf) != block_len / SECTOR_SIZE) {
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printf(" ** zfs_devread() read error - block\n");
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return 1;
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}
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block_len = byte_len & ~(SECTOR_SIZE - 1);
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buf += block_len;
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byte_len -= block_len;
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sector += block_len / SECTOR_SIZE;
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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 (zfs_blk_desc->block_read(zfs_blk_desc,
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part_info->start + sector,
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1, (void *)sec_buf) != 1) {
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printf(" ** zfs_devread() read error - last part\n");
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return 1;
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}
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memcpy(buf, sec_buf, byte_len);
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}
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return 0;
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}
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