[net-next-2.6.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 "hpfs_fn.h"

void hpfs_lock_creation(struct super_block *s)
{
#ifdef DEBUG_LOCKS
	printk("lock creation\n");
#endif
	down(&hpfs_sb(s)->hpfs_creation_de);
}

void hpfs_unlock_creation(struct super_block *s)
{
#ifdef DEBUG_LOCKS
	printk("unlock creation\n");
#endif
	up(&hpfs_sb(s)->hpfs_creation_de);
}

/* 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;

	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);*/

	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;

	cond_resched();

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

	qbh->data = data = (char *)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();

	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)
{
	PRINTK(("hpfs_mark_4buffers_dirty\n"));
	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	*/
	8
	9	#include "hpfs_fn.h"
	10
	11	void hpfs_lock_creation(struct super_block *s)
	12	{
	13	#ifdef DEBUG_LOCKS
	14	printk("lock creation\n");
	15	#endif
	16	down(&hpfs_sb(s)->hpfs_creation_de);
	17	}
	18
	19	void hpfs_unlock_creation(struct super_block *s)
	20	{
	21	#ifdef DEBUG_LOCKS
	22	printk("unlock creation\n");
	23	#endif
	24	up(&hpfs_sb(s)->hpfs_creation_de);
	25	}
	26
	27	/* Map a sector into a buffer and return pointers to it and to the buffer. */
	28
	29	void hpfs_map_sector(struct super_block s, unsigned secno, struct buffer_head **bhp,
	30	int ahead)
	31	{
	32	struct buffer_head *bh;
	33
	34	cond_resched();
	35
	36	*bhp = bh = sb_bread(s, secno);
	37	if (bh != NULL)
	38	return bh->b_data;
	39	else {
	40	printk("HPFS: hpfs_map_sector: read error\n");
	41	return NULL;
	42	}
	43	}
	44
	45	/* Like hpfs_map_sector but don't read anything */
	46
	47	void hpfs_get_sector(struct super_block s, unsigned secno, struct buffer_head **bhp)
	48	{
	49	struct buffer_head *bh;
	50	/return hpfs_map_sector(s, secno, bhp, 0);/
	51
	52	cond_resched();
	53
	54	if ((*bhp = bh = sb_getblk(s, secno)) != NULL) {
	55	if (!buffer_uptodate(bh)) wait_on_buffer(bh);
	56	set_buffer_uptodate(bh);
	57	return bh->b_data;
	58	} else {
	59	printk("HPFS: hpfs_get_sector: getblk failed\n");
	60	return NULL;
	61	}
	62	}
	63
	64	/* Map 4 sectors into a 4buffer and return pointers to it and to the buffer. */
65
66	void hpfs_map_4sectors(struct super_block s, unsigned secno, struct quad_buffer_head *qbh,
67	int ahead)
68	{
69	struct buffer_head *bh;
70	char *data;
71
72	cond_resched();
73
74	if (secno & 3) {
75	printk("HPFS: hpfs_map_4sectors: unaligned read\n");
76	return NULL;
77	}
78
79	qbh->data = data = (char *)kmalloc(2048, GFP_NOFS);
80	if (!data) {
81	printk("HPFS: hpfs_map_4sectors: out of memory\n");
82	goto bail;
83	}
84
85	qbh->bh[0] = bh = sb_bread(s, secno);
86	if (!bh)
87	goto bail0;
88	memcpy(data, bh->b_data, 512);
89
90	qbh->bh[1] = bh = sb_bread(s, secno + 1);
91	if (!bh)
92	goto bail1;
93	memcpy(data + 512, bh->b_data, 512);
94
95	qbh->bh[2] = bh = sb_bread(s, secno + 2);
96	if (!bh)
97	goto bail2;
98	memcpy(data + 2 * 512, bh->b_data, 512);
99
100	qbh->bh[3] = bh = sb_bread(s, secno + 3);
101	if (!bh)
102	goto bail3;
103	memcpy(data + 3 * 512, bh->b_data, 512);
104
105	return data;
106
107	bail3:
108	brelse(qbh->bh[2]);
109	bail2:
110	brelse(qbh->bh[1]);
111	bail1:
112	brelse(qbh->bh[0]);
113	bail0:
114	kfree(data);
115	printk("HPFS: hpfs_map_4sectors: read error\n");
116	bail:
117	return NULL;
118	}
119
120	/* Don't read sectors */
121
122	void hpfs_get_4sectors(struct super_block s, unsigned secno,
123	struct quad_buffer_head *qbh)
124	{
125	cond_resched();
126
127	if (secno & 3) {
128	printk("HPFS: hpfs_get_4sectors: unaligned read\n");
129	return NULL;
130	}
131
132	/return hpfs_map_4sectors(s, secno, qbh, 0);/
133	if (!(qbh->data = kmalloc(2048, GFP_NOFS))) {
134	printk("HPFS: hpfs_get_4sectors: out of memory\n");
135	return NULL;
136	}
137	if (!(hpfs_get_sector(s, secno, &qbh->bh[0]))) goto bail0;
138	if (!(hpfs_get_sector(s, secno + 1, &qbh->bh[1]))) goto bail1;
139	if (!(hpfs_get_sector(s, secno + 2, &qbh->bh[2]))) goto bail2;
140	if (!(hpfs_get_sector(s, secno + 3, &qbh->bh[3]))) goto bail3;
141	memcpy(qbh->data, qbh->bh[0]->b_data, 512);
142	memcpy(qbh->data + 512, qbh->bh[1]->b_data, 512);
143	memcpy(qbh->data + 2*512, qbh->bh[2]->b_data, 512);
144	memcpy(qbh->data + 3*512, qbh->bh[3]->b_data, 512);
145	return qbh->data;
146
147	bail3: brelse(qbh->bh[2]);
148	bail2: brelse(qbh->bh[1]);
149	bail1: brelse(qbh->bh[0]);
150	bail0:
151	return NULL;
152	}
153
154
155	void hpfs_brelse4(struct quad_buffer_head *qbh)
156	{
157	brelse(qbh->bh[3]);
158	brelse(qbh->bh[2]);
159	brelse(qbh->bh[1]);
160	brelse(qbh->bh[0]);
161	kfree(qbh->data);
162	}
163
164	void hpfs_mark_4buffers_dirty(struct quad_buffer_head *qbh)
165	{
166	PRINTK(("hpfs_mark_4buffers_dirty\n"));
167	memcpy(qbh->bh[0]->b_data, qbh->data, 512);
168	memcpy(qbh->bh[1]->b_data, qbh->data + 512, 512);
169	memcpy(qbh->bh[2]->b_data, qbh->data + 2 * 512, 512);
170	memcpy(qbh->bh[3]->b_data, qbh->data + 3 * 512, 512);
171	mark_buffer_dirty(qbh->bh[0]);
172	mark_buffer_dirty(qbh->bh[1]);
173	mark_buffer_dirty(qbh->bh[2]);
174	mark_buffer_dirty(qbh->bh[3]);
175	}