[linux-2.6-block.git] / fs / ufs / util.c

/*
 *  linux/fs/ufs/util.c
 *
 * Copyright (C) 1998
 * Daniel Pirkl <daniel.pirkl@email.cz>
 * Charles University, Faculty of Mathematics and Physics
 */
 
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/ufs_fs.h>
#include <linux/buffer_head.h>

#include "swab.h"
#include "util.h"

struct ufs_buffer_head * _ubh_bread_ (struct ufs_sb_private_info * uspi,
	struct super_block *sb, u64 fragment, u64 size)
{
	struct ufs_buffer_head * ubh;
	unsigned i, j ;
	u64  count = 0;
	if (size & ~uspi->s_fmask)
		return NULL;
	count = size >> uspi->s_fshift;
	if (count > UFS_MAXFRAG)
		return NULL;
	ubh = (struct ufs_buffer_head *)
		kmalloc (sizeof (struct ufs_buffer_head), GFP_KERNEL);
	if (!ubh)
		return NULL;
	ubh->fragment = fragment;
	ubh->count = count;
	for (i = 0; i < count; i++)
		if (!(ubh->bh[i] = sb_bread(sb, fragment + i)))
			goto failed;
	for (; i < UFS_MAXFRAG; i++)
		ubh->bh[i] = NULL;
	return ubh;
failed:
	for (j = 0; j < i; j++)
		brelse (ubh->bh[j]);
	kfree(ubh);
	return NULL;
}

struct ufs_buffer_head * ubh_bread_uspi (struct ufs_sb_private_info * uspi,
	struct super_block *sb, u64 fragment, u64 size)
{
	unsigned i, j;
	u64 count = 0;
	if (size & ~uspi->s_fmask)
		return NULL;
	count = size >> uspi->s_fshift;
	if (count <= 0 || count > UFS_MAXFRAG)
		return NULL;
	USPI_UBH(uspi)->fragment = fragment;
	USPI_UBH(uspi)->count = count;
	for (i = 0; i < count; i++)
		if (!(USPI_UBH(uspi)->bh[i] = sb_bread(sb, fragment + i)))
			goto failed;
	for (; i < UFS_MAXFRAG; i++)
		USPI_UBH(uspi)->bh[i] = NULL;
	return USPI_UBH(uspi);
failed:
	for (j = 0; j < i; j++)
		brelse (USPI_UBH(uspi)->bh[j]);
	return NULL;
}

void ubh_brelse (struct ufs_buffer_head * ubh)
{
	unsigned i;
	if (!ubh)
		return;
	for (i = 0; i < ubh->count; i++)
		brelse (ubh->bh[i]);
	kfree (ubh);
}

void ubh_brelse_uspi (struct ufs_sb_private_info * uspi)
{
	unsigned i;
	if (!USPI_UBH(uspi))
		return;
	for ( i = 0; i < USPI_UBH(uspi)->count; i++ ) {
		brelse (USPI_UBH(uspi)->bh[i]);
		USPI_UBH(uspi)->bh[i] = NULL;
	}
}

void ubh_mark_buffer_dirty (struct ufs_buffer_head * ubh)
{
	unsigned i;
	if (!ubh)
		return;
	for ( i = 0; i < ubh->count; i++ )
		mark_buffer_dirty (ubh->bh[i]);
}

void ubh_mark_buffer_uptodate (struct ufs_buffer_head * ubh, int flag)
{
	unsigned i;
	if (!ubh)
		return;
	if (flag) {
		for ( i = 0; i < ubh->count; i++ )
			set_buffer_uptodate (ubh->bh[i]);
	} else {
		for ( i = 0; i < ubh->count; i++ )
			clear_buffer_uptodate (ubh->bh[i]);
	}
}

void ubh_ll_rw_block (int rw, unsigned nr, struct ufs_buffer_head * ubh[])
{
	unsigned i;
	if (!ubh)
		return;
	for ( i = 0; i < nr; i++ )
		ll_rw_block (rw, ubh[i]->count, ubh[i]->bh);
}

void ubh_wait_on_buffer (struct ufs_buffer_head * ubh)
{
	unsigned i;
	if (!ubh)
		return;
	for ( i = 0; i < ubh->count; i++ )
		wait_on_buffer (ubh->bh[i]);
}

void ubh_bforget (struct ufs_buffer_head * ubh)
{
	unsigned i;
	if (!ubh) 
		return;
	for ( i = 0; i < ubh->count; i++ ) if ( ubh->bh[i] ) 
		bforget (ubh->bh[i]);
}
 
int ubh_buffer_dirty (struct ufs_buffer_head * ubh)
{
	unsigned i;
	unsigned result = 0;
	if (!ubh)
		return 0;
	for ( i = 0; i < ubh->count; i++ )
		result |= buffer_dirty(ubh->bh[i]);
	return result;
}

void _ubh_ubhcpymem_(struct ufs_sb_private_info * uspi, 
	unsigned char * mem, struct ufs_buffer_head * ubh, unsigned size)
{
	unsigned len, bhno;
	if (size > (ubh->count << uspi->s_fshift))
		size = ubh->count << uspi->s_fshift;
	bhno = 0;
	while (size) {
		len = min_t(unsigned int, size, uspi->s_fsize);
		memcpy (mem, ubh->bh[bhno]->b_data, len);
		mem += uspi->s_fsize;
		size -= len;
		bhno++;
	}
}

void _ubh_memcpyubh_(struct ufs_sb_private_info * uspi, 
	struct ufs_buffer_head * ubh, unsigned char * mem, unsigned size)
{
	unsigned len, bhno;
	if (size > (ubh->count << uspi->s_fshift))
		size = ubh->count << uspi->s_fshift;
	bhno = 0;
	while (size) {
		len = min_t(unsigned int, size, uspi->s_fsize);
		memcpy (ubh->bh[bhno]->b_data, mem, len);
		mem += uspi->s_fsize;
		size -= len;
		bhno++;
	}
}

dev_t
ufs_get_inode_dev(struct super_block *sb, struct ufs_inode_info *ufsi)
{
	__fs32 fs32;
	dev_t dev;

	if ((UFS_SB(sb)->s_flags & UFS_ST_MASK) == UFS_ST_SUNx86)
		fs32 = ufsi->i_u1.i_data[1];
	else
		fs32 = ufsi->i_u1.i_data[0];
	fs32 = fs32_to_cpu(sb, fs32);
	switch (UFS_SB(sb)->s_flags & UFS_ST_MASK) {
	case UFS_ST_SUNx86:
	case UFS_ST_SUN:
		if ((fs32 & 0xffff0000) == 0 ||
		    (fs32 & 0xffff0000) == 0xffff0000)
			dev = old_decode_dev(fs32 & 0x7fff);
		else
			dev = MKDEV(sysv_major(fs32), sysv_minor(fs32));
		break;

	default:
		dev = old_decode_dev(fs32);
		break;
	}
	return dev;
}

void
ufs_set_inode_dev(struct super_block *sb, struct ufs_inode_info *ufsi, dev_t dev)
{
	__fs32 fs32;

	switch (UFS_SB(sb)->s_flags & UFS_ST_MASK) {
	case UFS_ST_SUNx86:
	case UFS_ST_SUN:
		fs32 = sysv_encode_dev(dev);
		if ((fs32 & 0xffff8000) == 0) {
			fs32 = old_encode_dev(dev);
		}
		break;

	default:
		fs32 = old_encode_dev(dev);
		break;
	}
	fs32 = cpu_to_fs32(sb, fs32);
	if ((UFS_SB(sb)->s_flags & UFS_ST_MASK) == UFS_ST_SUNx86)
		ufsi->i_u1.i_data[1] = fs32;
	else
		ufsi->i_u1.i_data[0] = fs32;
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/fs/ufs/util.c
	3	*
	4	* Copyright (C) 1998
	5	* Daniel Pirkl <daniel.pirkl@email.cz>
	6	* Charles University, Faculty of Mathematics and Physics
	7	*/
	8
	9	#include <linux/string.h>
	10	#include <linux/slab.h>
	11	#include <linux/ufs_fs.h>
	12	#include <linux/buffer_head.h>
	13
	14	#include "swab.h"
	15	#include "util.h"
	16
1da177e4 LT	17	struct ufs_buffer_head * _ubh_bread_ (struct ufs_sb_private_info * uspi,
	18	struct super_block *sb, u64 fragment, u64 size)
	19	{
	20	struct ufs_buffer_head * ubh;
	21	unsigned i, j ;
	22	u64 count = 0;
	23	if (size & ~uspi->s_fmask)
	24	return NULL;
	25	count = size >> uspi->s_fshift;
	26	if (count > UFS_MAXFRAG)
	27	return NULL;
	28	ubh = (struct ufs_buffer_head *)
	29	kmalloc (sizeof (struct ufs_buffer_head), GFP_KERNEL);
	30	if (!ubh)
	31	return NULL;
	32	ubh->fragment = fragment;
	33	ubh->count = count;
	34	for (i = 0; i < count; i++)
	35	if (!(ubh->bh[i] = sb_bread(sb, fragment + i)))
	36	goto failed;
	37	for (; i < UFS_MAXFRAG; i++)
	38	ubh->bh[i] = NULL;
	39	return ubh;
	40	failed:
	41	for (j = 0; j < i; j++)
	42	brelse (ubh->bh[j]);
	43	kfree(ubh);
	44	return NULL;
	45	}
	46
	47	struct ufs_buffer_head * ubh_bread_uspi (struct ufs_sb_private_info * uspi,
	48	struct super_block *sb, u64 fragment, u64 size)
	49	{
	50	unsigned i, j;
	51	u64 count = 0;
	52	if (size & ~uspi->s_fmask)
	53	return NULL;
	54	count = size >> uspi->s_fshift;
	55	if (count <= 0 \|\| count > UFS_MAXFRAG)
	56	return NULL;
9695ef16 ED	57	USPI_UBH(uspi)->fragment = fragment;
9695ef16 ED	58	USPI_UBH(uspi)->count = count;
1da177e4	59	for (i = 0; i < count; i++)
9695ef16	60	if (!(USPI_UBH(uspi)->bh[i] = sb_bread(sb, fragment + i)))
1da177e4 LT	61	goto failed;
1da177e4 LT	62	for (; i < UFS_MAXFRAG; i++)
9695ef16 ED	63	USPI_UBH(uspi)->bh[i] = NULL;
9695ef16 ED	64	return USPI_UBH(uspi);
1da177e4 LT	65	failed:
1da177e4 LT	66	for (j = 0; j < i; j++)
9695ef16	67	brelse (USPI_UBH(uspi)->bh[j]);
1da177e4 LT	68	return NULL;
	69	}
	70
	71	void ubh_brelse (struct ufs_buffer_head * ubh)
	72	{
	73	unsigned i;
	74	if (!ubh)
	75	return;
	76	for (i = 0; i < ubh->count; i++)
	77	brelse (ubh->bh[i]);
	78	kfree (ubh);
	79	}
	80
	81	void ubh_brelse_uspi (struct ufs_sb_private_info * uspi)
	82	{
	83	unsigned i;
9695ef16	84	if (!USPI_UBH(uspi))
1da177e4	85	return;
9695ef16 ED	86	for ( i = 0; i < USPI_UBH(uspi)->count; i++ ) {
	87	brelse (USPI_UBH(uspi)->bh[i]);
	88	USPI_UBH(uspi)->bh[i] = NULL;
1da177e4 LT	89	}
	90	}
	91
	92	void ubh_mark_buffer_dirty (struct ufs_buffer_head * ubh)
	93	{
	94	unsigned i;
	95	if (!ubh)
	96	return;
	97	for ( i = 0; i < ubh->count; i++ )
	98	mark_buffer_dirty (ubh->bh[i]);
	99	}
	100
	101	void ubh_mark_buffer_uptodate (struct ufs_buffer_head * ubh, int flag)
	102	{
	103	unsigned i;
	104	if (!ubh)
	105	return;
	106	if (flag) {
	107	for ( i = 0; i < ubh->count; i++ )
	108	set_buffer_uptodate (ubh->bh[i]);
	109	} else {
	110	for ( i = 0; i < ubh->count; i++ )
	111	clear_buffer_uptodate (ubh->bh[i]);
	112	}
	113	}
	114
	115	void ubh_ll_rw_block (int rw, unsigned nr, struct ufs_buffer_head * ubh[])
	116	{
	117	unsigned i;
	118	if (!ubh)
	119	return;
	120	for ( i = 0; i < nr; i++ )
	121	ll_rw_block (rw, ubh[i]->count, ubh[i]->bh);
	122	}
	123
	124	void ubh_wait_on_buffer (struct ufs_buffer_head * ubh)
	125	{
	126	unsigned i;
	127	if (!ubh)
	128	return;
	129	for ( i = 0; i < ubh->count; i++ )
	130	wait_on_buffer (ubh->bh[i]);
	131	}
	132
1da177e4 LT	133	void ubh_bforget (struct ufs_buffer_head * ubh)
	134	{
	135	unsigned i;
	136	if (!ubh)
	137	return;
	138	for ( i = 0; i < ubh->count; i++ ) if ( ubh->bh[i] )
	139	bforget (ubh->bh[i]);
	140	}
	141
	142	int ubh_buffer_dirty (struct ufs_buffer_head * ubh)
	143	{
	144	unsigned i;
	145	unsigned result = 0;
	146	if (!ubh)
	147	return 0;
	148	for ( i = 0; i < ubh->count; i++ )
	149	result \|= buffer_dirty(ubh->bh[i]);
	150	return result;
	151	}
	152
	153	void _ubh_ubhcpymem_(struct ufs_sb_private_info * uspi,
	154	unsigned char * mem, struct ufs_buffer_head * ubh, unsigned size)
	155	{
	156	unsigned len, bhno;
	157	if (size > (ubh->count << uspi->s_fshift))
	158	size = ubh->count << uspi->s_fshift;
	159	bhno = 0;
	160	while (size) {
	161	len = min_t(unsigned int, size, uspi->s_fsize);
	162	memcpy (mem, ubh->bh[bhno]->b_data, len);
	163	mem += uspi->s_fsize;
	164	size -= len;
	165	bhno++;
	166	}
	167	}
	168
	169	void _ubh_memcpyubh_(struct ufs_sb_private_info * uspi,
	170	struct ufs_buffer_head * ubh, unsigned char * mem, unsigned size)
	171	{
	172	unsigned len, bhno;
	173	if (size > (ubh->count << uspi->s_fshift))
	174	size = ubh->count << uspi->s_fshift;
	175	bhno = 0;
	176	while (size) {
	177	len = min_t(unsigned int, size, uspi->s_fsize);
	178	memcpy (ubh->bh[bhno]->b_data, mem, len);
	179	mem += uspi->s_fsize;
	180	size -= len;
	181	bhno++;
	182	}
	183	}
	184
	185	dev_t
	186	ufs_get_inode_dev(struct super_block sb, struct ufs_inode_info ufsi)
	187	{
	188	__fs32 fs32;
	189	dev_t dev;
	190
	191	if ((UFS_SB(sb)->s_flags & UFS_ST_MASK) == UFS_ST_SUNx86)
	192	fs32 = ufsi->i_u1.i_data[1];
	193	else
	194	fs32 = ufsi->i_u1.i_data[0];
	195	fs32 = fs32_to_cpu(sb, fs32);
	196	switch (UFS_SB(sb)->s_flags & UFS_ST_MASK) {
197	case UFS_ST_SUNx86:
198	case UFS_ST_SUN:
199	if ((fs32 & 0xffff0000) == 0 \|\|
200	(fs32 & 0xffff0000) == 0xffff0000)
201	dev = old_decode_dev(fs32 & 0x7fff);
202	else
203	dev = MKDEV(sysv_major(fs32), sysv_minor(fs32));
204	break;
205
206	default:
207	dev = old_decode_dev(fs32);
208	break;
209	}
210	return dev;
211	}
212
213	void
214	ufs_set_inode_dev(struct super_block sb, struct ufs_inode_info ufsi, dev_t dev)
215	{
216	__fs32 fs32;
217
218	switch (UFS_SB(sb)->s_flags & UFS_ST_MASK) {
219	case UFS_ST_SUNx86:
220	case UFS_ST_SUN:
221	fs32 = sysv_encode_dev(dev);
222	if ((fs32 & 0xffff8000) == 0) {
223	fs32 = old_encode_dev(dev);
224	}
225	break;
226
227	default:
228	fs32 = old_encode_dev(dev);
229	break;
230	}
231	fs32 = cpu_to_fs32(sb, fs32);
232	if ((UFS_SB(sb)->s_flags & UFS_ST_MASK) == UFS_ST_SUNx86)
233	ufsi->i_u1.i_data[1] = fs32;
234	else
235	ufsi->i_u1.i_data[0] = fs32;
236	}