[mirror_ubuntu-artful-kernel.git] / fs / hpfs / buffer.c

/*
 *  linux/fs/hpfs/buffer.c
 *
 *  Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999
 *
 *  general buffer i/o
 */
#include <linux/sched.h>
#include <linux/slab.h>
#include "hpfs_fn.h"

/* Map a sector into a buffer and return pointers to it and to the buffer. */

void *hpfs_map_sector(struct super_block *s, unsigned secno, struct buffer_head **bhp,
		 int ahead)
{
	struct buffer_head *bh;

	hpfs_lock_assert(s);

	cond_resched();

	*bhp = bh = sb_bread(s, secno);
	if (bh != NULL)
		return bh->b_data;
	else {
		printk("HPFS: hpfs_map_sector: read error\n");
		return NULL;
	}
}

/* Like hpfs_map_sector but don't read anything */

void *hpfs_get_sector(struct super_block *s, unsigned secno, struct buffer_head **bhp)
{
	struct buffer_head *bh;
	/*return hpfs_map_sector(s, secno, bhp, 0);*/

	hpfs_lock_assert(s);

	cond_resched();

	if ((*bhp = bh = sb_getblk(s, secno)) != NULL) {
		if (!buffer_uptodate(bh)) wait_on_buffer(bh);
		set_buffer_uptodate(bh);
		return bh->b_data;
	} else {
		printk("HPFS: hpfs_get_sector: getblk failed\n");
		return NULL;
	}
}

/* Map 4 sectors into a 4buffer and return pointers to it and to the buffer. */

void *hpfs_map_4sectors(struct super_block *s, unsigned secno, struct quad_buffer_head *qbh,
		   int ahead)
{
	struct buffer_head *bh;
	char *data;

	hpfs_lock_assert(s);

	cond_resched();

	if (secno & 3) {
		printk("HPFS: hpfs_map_4sectors: unaligned read\n");
		return NULL;
	}

	qbh->data = data = kmalloc(2048, GFP_NOFS);
	if (!data) {
		printk("HPFS: hpfs_map_4sectors: out of memory\n");
		goto bail;
	}

	qbh->bh[0] = bh = sb_bread(s, secno);
	if (!bh)
		goto bail0;
	memcpy(data, bh->b_data, 512);

	qbh->bh[1] = bh = sb_bread(s, secno + 1);
	if (!bh)
		goto bail1;
	memcpy(data + 512, bh->b_data, 512);

	qbh->bh[2] = bh = sb_bread(s, secno + 2);
	if (!bh)
		goto bail2;
	memcpy(data + 2 * 512, bh->b_data, 512);

	qbh->bh[3] = bh = sb_bread(s, secno + 3);
	if (!bh)
		goto bail3;
	memcpy(data + 3 * 512, bh->b_data, 512);

	return data;

 bail3:
	brelse(qbh->bh[2]);
 bail2:
	brelse(qbh->bh[1]);
 bail1:
	brelse(qbh->bh[0]);
 bail0:
	kfree(data);
	printk("HPFS: hpfs_map_4sectors: read error\n");
 bail:
	return NULL;
}

/* Don't read sectors */

void *hpfs_get_4sectors(struct super_block *s, unsigned secno,
                          struct quad_buffer_head *qbh)
{
	cond_resched();

	hpfs_lock_assert(s);

	if (secno & 3) {
		printk("HPFS: hpfs_get_4sectors: unaligned read\n");
		return NULL;
	}

	/*return hpfs_map_4sectors(s, secno, qbh, 0);*/
	if (!(qbh->data = kmalloc(2048, GFP_NOFS))) {
		printk("HPFS: hpfs_get_4sectors: out of memory\n");
		return NULL;
	}
	if (!(hpfs_get_sector(s, secno, &qbh->bh[0]))) goto bail0;
	if (!(hpfs_get_sector(s, secno + 1, &qbh->bh[1]))) goto bail1;
	if (!(hpfs_get_sector(s, secno + 2, &qbh->bh[2]))) goto bail2;
	if (!(hpfs_get_sector(s, secno + 3, &qbh->bh[3]))) goto bail3;
	memcpy(qbh->data, qbh->bh[0]->b_data, 512);
	memcpy(qbh->data + 512, qbh->bh[1]->b_data, 512);
	memcpy(qbh->data + 2*512, qbh->bh[2]->b_data, 512);
	memcpy(qbh->data + 3*512, qbh->bh[3]->b_data, 512);
	return qbh->data;

	bail3:	brelse(qbh->bh[2]);
	bail2:	brelse(qbh->bh[1]);
	bail1:	brelse(qbh->bh[0]);
	bail0:
	return NULL;
}
	

void hpfs_brelse4(struct quad_buffer_head *qbh)
{
	brelse(qbh->bh[3]);
	brelse(qbh->bh[2]);
	brelse(qbh->bh[1]);
	brelse(qbh->bh[0]);
	kfree(qbh->data);
}	

void hpfs_mark_4buffers_dirty(struct quad_buffer_head *qbh)
{
	memcpy(qbh->bh[0]->b_data, qbh->data, 512);
	memcpy(qbh->bh[1]->b_data, qbh->data + 512, 512);
	memcpy(qbh->bh[2]->b_data, qbh->data + 2 * 512, 512);
	memcpy(qbh->bh[3]->b_data, qbh->data + 3 * 512, 512);
	mark_buffer_dirty(qbh->bh[0]);
	mark_buffer_dirty(qbh->bh[1]);
	mark_buffer_dirty(qbh->bh[2]);
	mark_buffer_dirty(qbh->bh[3]);
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/fs/hpfs/buffer.c
	3	*
	4	* Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999
	5	*
	6	* general buffer i/o
	7	*/
e8edc6e0	8	#include <linux/sched.h>
5a0e3ad6	9	#include <linux/slab.h>
1da177e4 LT	10	#include "hpfs_fn.h"
1da177e4 LT	11
1da177e4 LT	12	/* Map a sector into a buffer and return pointers to it and to the buffer. */
	13
	14	void hpfs_map_sector(struct super_block s, unsigned secno, struct buffer_head **bhp,
	15	int ahead)
	16	{
	17	struct buffer_head *bh;
	18
7dd29d8d MP	19	hpfs_lock_assert(s);
7dd29d8d MP	20
1da177e4 LT	21	cond_resched();
	22
	23	*bhp = bh = sb_bread(s, secno);
	24	if (bh != NULL)
	25	return bh->b_data;
	26	else {
	27	printk("HPFS: hpfs_map_sector: read error\n");
	28	return NULL;
	29	}
	30	}
	31
	32	/* Like hpfs_map_sector but don't read anything */
	33
	34	void hpfs_get_sector(struct super_block s, unsigned secno, struct buffer_head **bhp)
	35	{
	36	struct buffer_head *bh;
	37	/return hpfs_map_sector(s, secno, bhp, 0);/
	38
7dd29d8d MP	39	hpfs_lock_assert(s);
7dd29d8d MP	40
1da177e4 LT	41	cond_resched();
	42
	43	if ((*bhp = bh = sb_getblk(s, secno)) != NULL) {
	44	if (!buffer_uptodate(bh)) wait_on_buffer(bh);
	45	set_buffer_uptodate(bh);
	46	return bh->b_data;
	47	} else {
	48	printk("HPFS: hpfs_get_sector: getblk failed\n");
	49	return NULL;
	50	}
	51	}
	52
	53	/* Map 4 sectors into a 4buffer and return pointers to it and to the buffer. */
	54
	55	void hpfs_map_4sectors(struct super_block s, unsigned secno, struct quad_buffer_head *qbh,
	56	int ahead)
	57	{
	58	struct buffer_head *bh;
	59	char *data;
	60
7dd29d8d MP	61	hpfs_lock_assert(s);
7dd29d8d MP	62
1da177e4 LT	63	cond_resched();
	64
	65	if (secno & 3) {
	66	printk("HPFS: hpfs_map_4sectors: unaligned read\n");
	67	return NULL;
	68	}
	69
f52720ca	70	qbh->data = data = kmalloc(2048, GFP_NOFS);
1da177e4 LT	71	if (!data) {
	72	printk("HPFS: hpfs_map_4sectors: out of memory\n");
	73	goto bail;
	74	}
	75
	76	qbh->bh[0] = bh = sb_bread(s, secno);
	77	if (!bh)
	78	goto bail0;
	79	memcpy(data, bh->b_data, 512);
	80
	81	qbh->bh[1] = bh = sb_bread(s, secno + 1);
	82	if (!bh)
	83	goto bail1;
	84	memcpy(data + 512, bh->b_data, 512);
	85
	86	qbh->bh[2] = bh = sb_bread(s, secno + 2);
	87	if (!bh)
	88	goto bail2;
	89	memcpy(data + 2 * 512, bh->b_data, 512);
	90
	91	qbh->bh[3] = bh = sb_bread(s, secno + 3);
	92	if (!bh)
	93	goto bail3;
	94	memcpy(data + 3 * 512, bh->b_data, 512);
	95
	96	return data;
	97
	98	bail3:
	99	brelse(qbh->bh[2]);
	100	bail2:
	101	brelse(qbh->bh[1]);
	102	bail1:
	103	brelse(qbh->bh[0]);
	104	bail0:
	105	kfree(data);
	106	printk("HPFS: hpfs_map_4sectors: read error\n");
	107	bail:
	108	return NULL;
	109	}
	110
	111	/* Don't read sectors */
	112
	113	void hpfs_get_4sectors(struct super_block s, unsigned secno,
	114	struct quad_buffer_head *qbh)
	115	{
	116	cond_resched();
	117
7dd29d8d MP	118	hpfs_lock_assert(s);
7dd29d8d MP	119
1da177e4 LT	120	if (secno & 3) {
	121	printk("HPFS: hpfs_get_4sectors: unaligned read\n");
	122	return NULL;
	123	}
	124
	125	/return hpfs_map_4sectors(s, secno, qbh, 0);/
	126	if (!(qbh->data = kmalloc(2048, GFP_NOFS))) {
	127	printk("HPFS: hpfs_get_4sectors: out of memory\n");
	128	return NULL;
	129	}
	130	if (!(hpfs_get_sector(s, secno, &qbh->bh[0]))) goto bail0;
	131	if (!(hpfs_get_sector(s, secno + 1, &qbh->bh[1]))) goto bail1;
	132	if (!(hpfs_get_sector(s, secno + 2, &qbh->bh[2]))) goto bail2;
	133	if (!(hpfs_get_sector(s, secno + 3, &qbh->bh[3]))) goto bail3;
	134	memcpy(qbh->data, qbh->bh[0]->b_data, 512);
	135	memcpy(qbh->data + 512, qbh->bh[1]->b_data, 512);
	136	memcpy(qbh->data + 2*512, qbh->bh[2]->b_data, 512);
	137	memcpy(qbh->data + 3*512, qbh->bh[3]->b_data, 512);
	138	return qbh->data;
	139
	140	bail3: brelse(qbh->bh[2]);
	141	bail2: brelse(qbh->bh[1]);
	142	bail1: brelse(qbh->bh[0]);
	143	bail0:
	144	return NULL;
	145	}
	146
	147
	148	void hpfs_brelse4(struct quad_buffer_head *qbh)
	149	{
	150	brelse(qbh->bh[3]);
	151	brelse(qbh->bh[2]);
	152	brelse(qbh->bh[1]);
	153	brelse(qbh->bh[0]);
	154	kfree(qbh->data);
	155	}
	156
	157	void hpfs_mark_4buffers_dirty(struct quad_buffer_head *qbh)
	158	{
1da177e4 LT	159	memcpy(qbh->bh[0]->b_data, qbh->data, 512);
	160	memcpy(qbh->bh[1]->b_data, qbh->data + 512, 512);
	161	memcpy(qbh->bh[2]->b_data, qbh->data + 2 * 512, 512);
	162	memcpy(qbh->bh[3]->b_data, qbh->data + 3 * 512, 512);
	163	mark_buffer_dirty(qbh->bh[0]);
	164	mark_buffer_dirty(qbh->bh[1]);
	165	mark_buffer_dirty(qbh->bh[2]);
	166	mark_buffer_dirty(qbh->bh[3]);
	167	}