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

/*
 *  (C) Copyright 2003 - 2004
 *  Sysgo AG, <www.elinos.com>, Pavel Bartusek <pba@sysgo.com>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */


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

#include "reiserfs_private.h"

static block_dev_desc_t *reiserfs_block_dev_desc;
static disk_partition_t part_info;


int reiserfs_set_blk_dev(block_dev_desc_t *rbdd, int part)
{
	reiserfs_block_dev_desc = rbdd;

	if (part == 0) {
		/* disk doesn't use partition table */
		part_info.start = 0;
		part_info.size = rbdd->lba;
		part_info.blksz = rbdd->blksz;
	} else {
		if (get_partition_info (reiserfs_block_dev_desc, part, &part_info)) {
			return 0;
		}
	}
	return (part_info.size);
}


int reiserfs_devread (int sector, int byte_offset, int byte_len, char *buf)
{
	char sec_buf[SECTOR_SIZE];
	unsigned block_len;
/*
	unsigned len = byte_len;
	u8 *start = buf;
*/
	/*
	*  Check partition boundaries
	*/
	if (sector < 0
	    || ((sector + ((byte_offset + byte_len - 1) >> SECTOR_BITS))
	    >= part_info.size)) {
/*		errnum = ERR_OUTSIDE_PART; */
		printf (" ** reiserfs_devread() read outside partition\n");
		return 0;
	}

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

#if defined(DEBUG)
	printf (" <%d, %d, %d> ", sector, byte_offset, byte_len);
#endif


	if (reiserfs_block_dev_desc == NULL)
		return 0;


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

	/* read sector aligned part */
	block_len = byte_len & ~(SECTOR_SIZE-1);
	if (reiserfs_block_dev_desc->block_read(reiserfs_block_dev_desc->dev,
	    part_info.start+sector, block_len/SECTOR_SIZE, (unsigned long *)buf) !=
	    block_len/SECTOR_SIZE) {
		printf (" ** reiserfs_devread() read error - block\n");
		return 0;
	}
	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 (reiserfs_block_dev_desc->block_read(reiserfs_block_dev_desc->dev,
		    part_info.start+sector, 1, (unsigned long *)sec_buf) != 1) {
			printf (" ** reiserfs_devread() read error - last part\n");
			return 0;
		}
		memcpy(buf, sec_buf, byte_len);
	}

	return 1;
}
Commit	Line	Data
518e2e1a WD	1	/*
	2	* (C) Copyright 2003 - 2004
	3	* Sysgo AG, <www.elinos.com>, Pavel Bartusek <pba@sysgo.com>
	4	*
	5	* This program is free software; you can redistribute it and/or modify
	6	* it under the terms of the GNU General Public License as published by
	7	* the Free Software Foundation; either version 2 of the License, or
	8	* (at your option) any later version.
	9	*
	10	* This program is distributed in the hope that it will be useful,
	11	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	13	* GNU General Public License for more details.
	14	*
	15	* You should have received a copy of the GNU General Public License
	16	* along with this program; if not, write to the Free Software
	17	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	18	*/
	19
	20
	21	#include <common.h>
518e2e1a WD	22	#include <config.h>
	23	#include <reiserfs.h>
	24
	25	#include "reiserfs_private.h"
	26
	27	static block_dev_desc_t *reiserfs_block_dev_desc;
	28	static disk_partition_t part_info;
	29
	30
	31	int reiserfs_set_blk_dev(block_dev_desc_t *rbdd, int part)
	32	{
	33	reiserfs_block_dev_desc = rbdd;
	34
	35	if (part == 0) {
53677ef1	36	/* disk doesn't use partition table */
518e2e1a WD	37	part_info.start = 0;
	38	part_info.size = rbdd->lba;
	39	part_info.blksz = rbdd->blksz;
	40	} else {
	41	if (get_partition_info (reiserfs_block_dev_desc, part, &part_info)) {
	42	return 0;
	43	}
	44	}
	45	return (part_info.size);
	46	}
	47
	48
	49	int reiserfs_devread (int sector, int byte_offset, int byte_len, char *buf)
	50	{
	51	char sec_buf[SECTOR_SIZE];
	52	unsigned block_len;
	53	/*
	54	unsigned len = byte_len;
	55	u8 *start = buf;
	56	*/
	57	/*
	58	* Check partition boundaries
	59	*/
	60	if (sector < 0
	61	\|\| ((sector + ((byte_offset + byte_len - 1) >> SECTOR_BITS))
	62	>= part_info.size)) {
b79a11cc	63	/* errnum = ERR_OUTSIDE_PART; */
518e2e1a WD	64	printf (" ** reiserfs_devread() read outside partition\n");
	65	return 0;
	66	}
	67
	68	/*
	69	* Get the read to the beginning of a partition.
	70	*/
	71	sector += byte_offset >> SECTOR_BITS;
	72	byte_offset &= SECTOR_SIZE - 1;
	73
	74	#if defined(DEBUG)
	75	printf (" <%d, %d, %d> ", sector, byte_offset, byte_len);
	76	#endif
	77
	78
	79	if (reiserfs_block_dev_desc == NULL)
	80	return 0;
	81
	82
	83	if (byte_offset != 0) {
	84	/* read first part which isn't aligned with start of sector */
	85	if (reiserfs_block_dev_desc->block_read(reiserfs_block_dev_desc->dev,
	86	part_info.start+sector, 1, (unsigned long *)sec_buf) != 1) {
	87	printf (" ** reiserfs_devread() read error\n");
	88	return 0;
	89	}
	90	memcpy(buf, sec_buf+byte_offset, min(SECTOR_SIZE-byte_offset, byte_len));
	91	buf+=min(SECTOR_SIZE-byte_offset, byte_len);
	92	byte_len-=min(SECTOR_SIZE-byte_offset, byte_len);
	93	sector++;
	94	}
	95
	96	/* read sector aligned part */
	97	block_len = byte_len & ~(SECTOR_SIZE-1);
	98	if (reiserfs_block_dev_desc->block_read(reiserfs_block_dev_desc->dev,
	99	part_info.start+sector, block_len/SECTOR_SIZE, (unsigned long *)buf) !=
	100	block_len/SECTOR_SIZE) {
	101	printf (" ** reiserfs_devread() read error - block\n");
	102	return 0;
	103	}
	104	buf+=block_len;
	105	byte_len-=block_len;
	106	sector+= block_len/SECTOR_SIZE;
	107
	108	if ( byte_len != 0 ) {
	109	/* read rest of data which are not in whole sector */
	110	if (reiserfs_block_dev_desc->block_read(reiserfs_block_dev_desc->dev,
	111	part_info.start+sector, 1, (unsigned long *)sec_buf) != 1) {
	112	printf (" ** reiserfs_devread() read error - last part\n");
	113	return 0;
	114	}
	115	memcpy(buf, sec_buf, byte_len);
	116	}
	117
	118	return 1;
	119	}