[people/ms/u-boot.git] / fs / zfs / dev.c

/*
 *
 *	based on code of fs/reiserfs/dev.c by
 *
 *	(C) Copyright 2003 - 2004
 *	Sysgo AG, <www.elinos.com>, Pavel Bartusek <pba@sysgo.com>
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */


#include <common.h>
#include <config.h>
#include <zfs_common.h>

static block_dev_desc_t *zfs_block_dev_desc;
static disk_partition_t *part_info;

void zfs_set_blk_dev(block_dev_desc_t *rbdd, disk_partition_t *info)
{
	zfs_block_dev_desc = rbdd;
	part_info = info;
}

/* err */
int zfs_devread(int sector, int byte_offset, int byte_len, char *buf)
{
	short sec_buffer[SECTOR_SIZE/sizeof(short)];
	char *sec_buf = (char *)sec_buffer;
	unsigned block_len;

	/*
	 *	Check partition boundaries
	 */
	if ((sector < 0) ||
		((sector + ((byte_offset + byte_len - 1) >> SECTOR_BITS)) >=
		 part_info->size)) {
		/*		errnum = ERR_OUTSIDE_PART; */
		printf(" ** zfs_devread() read outside partition sector %d\n", sector);
		return 1;
	}

	/*
	 *	Get the read to the beginning of a partition.
	 */
	sector += byte_offset >> SECTOR_BITS;
	byte_offset &= SECTOR_SIZE - 1;

	debug(" <%d, %d, %d>\n", sector, byte_offset, byte_len);

	if (zfs_block_dev_desc == NULL) {
		printf("** Invalid Block Device Descriptor (NULL)\n");
		return 1;
	}

	if (byte_offset != 0) {
		/* read first part which isn't aligned with start of sector */
		if (zfs_block_dev_desc->block_read(zfs_block_dev_desc->dev,
			part_info->start + sector, 1,
			(unsigned long *)sec_buf) != 1) {
			printf(" ** zfs_devread() read error **\n");
			return 1;
		}
		memcpy(buf, sec_buf + byte_offset,
			   min(SECTOR_SIZE - byte_offset, byte_len));
		buf += min(SECTOR_SIZE - byte_offset, byte_len);
		byte_len -= min(SECTOR_SIZE - byte_offset, byte_len);
		sector++;
	}

	if (byte_len == 0)
		return 0;

	/*	read sector aligned part */
	block_len = byte_len & ~(SECTOR_SIZE - 1);

	if (block_len == 0) {
		u8 p[SECTOR_SIZE];

		block_len = SECTOR_SIZE;
		zfs_block_dev_desc->block_read(zfs_block_dev_desc->dev,
			part_info->start + sector,
			1, (unsigned long *)p);
		memcpy(buf, p, byte_len);
		return 0;
	}

	if (zfs_block_dev_desc->block_read(zfs_block_dev_desc->dev,
		part_info->start + sector, block_len / SECTOR_SIZE,
		(unsigned long *) buf) != block_len / SECTOR_SIZE) {
		printf(" ** zfs_devread() read error - block\n");
		return 1;
	}

	block_len = byte_len & ~(SECTOR_SIZE - 1);
	buf += block_len;
	byte_len -= block_len;
	sector += block_len / SECTOR_SIZE;

	if (byte_len != 0) {
		/* read rest of data which are not in whole sector */
		if (zfs_block_dev_desc->
			block_read(zfs_block_dev_desc->dev,
					   part_info->start + sector, 1,
					   (unsigned long *) sec_buf) != 1) {
			printf(" ** zfs_devread() read error - last part\n");
			return 1;
		}
		memcpy(buf, sec_buf, byte_len);
	}
	return 0;
}
Commit	Line	Data
4d3c95f5 JL	1	/*
	2	*
	3	* based on code of fs/reiserfs/dev.c by
	4	*
	5	* (C) Copyright 2003 - 2004
	6	* Sysgo AG, <www.elinos.com>, Pavel Bartusek <pba@sysgo.com>
	7	*
1a459660	8	* SPDX-License-Identifier: GPL-2.0+
4d3c95f5 JL	9	*/
	10
	11
	12	#include <common.h>
	13	#include <config.h>
	14	#include <zfs_common.h>
	15
	16	static block_dev_desc_t *zfs_block_dev_desc;
41204570	17	static disk_partition_t *part_info;
4d3c95f5	18
41204570	19	void zfs_set_blk_dev(block_dev_desc_t rbdd, disk_partition_t info)
4d3c95f5 JL	20	{
4d3c95f5 JL	21	zfs_block_dev_desc = rbdd;
41204570	22	part_info = info;
4d3c95f5 JL	23	}
	24
	25	/* err */
	26	int zfs_devread(int sector, int byte_offset, int byte_len, char *buf)
	27	{
	28	short sec_buffer[SECTOR_SIZE/sizeof(short)];
	29	char sec_buf = (char )sec_buffer;
	30	unsigned block_len;
	31
	32	/*
	33	* Check partition boundaries
	34	*/
	35	if ((sector < 0) \|\|
	36	((sector + ((byte_offset + byte_len - 1) >> SECTOR_BITS)) >=
41204570	37	part_info->size)) {
4d3c95f5 JL	38	/* errnum = ERR_OUTSIDE_PART; */
	39	printf(" ** zfs_devread() read outside partition sector %d\n", sector);
	40	return 1;
	41	}
	42
	43	/*
	44	* Get the read to the beginning of a partition.
	45	*/
	46	sector += byte_offset >> SECTOR_BITS;
	47	byte_offset &= SECTOR_SIZE - 1;
	48
	49	debug(" <%d, %d, %d>\n", sector, byte_offset, byte_len);
	50
	51	if (zfs_block_dev_desc == NULL) {
	52	printf("** Invalid Block Device Descriptor (NULL)\n");
	53	return 1;
	54	}
	55
	56	if (byte_offset != 0) {
	57	/* read first part which isn't aligned with start of sector */
	58	if (zfs_block_dev_desc->block_read(zfs_block_dev_desc->dev,
41204570 RH	59	part_info->start + sector, 1,
41204570 RH	60	(unsigned long *)sec_buf) != 1) {
4d3c95f5 JL	61	printf(" zfs_devread() read error \n");
	62	return 1;
	63	}
	64	memcpy(buf, sec_buf + byte_offset,
	65	min(SECTOR_SIZE - byte_offset, byte_len));
	66	buf += min(SECTOR_SIZE - byte_offset, byte_len);
	67	byte_len -= min(SECTOR_SIZE - byte_offset, byte_len);
	68	sector++;
	69	}
	70
	71	if (byte_len == 0)
	72	return 0;
	73
	74	/* read sector aligned part */
	75	block_len = byte_len & ~(SECTOR_SIZE - 1);
	76
	77	if (block_len == 0) {
	78	u8 p[SECTOR_SIZE];
	79
	80	block_len = SECTOR_SIZE;
	81	zfs_block_dev_desc->block_read(zfs_block_dev_desc->dev,
41204570 RH	82	part_info->start + sector,
41204570 RH	83	1, (unsigned long *)p);
4d3c95f5 JL	84	memcpy(buf, p, byte_len);
	85	return 0;
	86	}
	87
	88	if (zfs_block_dev_desc->block_read(zfs_block_dev_desc->dev,
41204570 RH	89	part_info->start + sector, block_len / SECTOR_SIZE,
41204570 RH	90	(unsigned long *) buf) != block_len / SECTOR_SIZE) {
4d3c95f5 JL	91	printf(" ** zfs_devread() read error - block\n");
	92	return 1;
	93	}
	94
	95	block_len = byte_len & ~(SECTOR_SIZE - 1);
	96	buf += block_len;
	97	byte_len -= block_len;
	98	sector += block_len / SECTOR_SIZE;
	99
	100	if (byte_len != 0) {
	101	/* read rest of data which are not in whole sector */
	102	if (zfs_block_dev_desc->
	103	block_read(zfs_block_dev_desc->dev,
41204570	104	part_info->start + sector, 1,
4d3c95f5 JL	105	(unsigned long *) sec_buf) != 1) {
	106	printf(" ** zfs_devread() read error - last part\n");
	107	return 1;
	108	}
	109	memcpy(buf, sec_buf, byte_len);
	110	}
	111	return 0;
	112	}