[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, struct ufs_buffer_head *ubh)
{
	if (!ubh)
		return;

	ll_rw_block(rw, ubh->count, ubh->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;
}

/**
 * ufs_get_locked_page() - locate, pin and lock a pagecache page, if not exist
 * read it from disk.
 * @mapping: the address_space to search
 * @index: the page index
 *
 * Locates the desired pagecache page, if not exist we'll read it,
 * locks it, increments its reference
 * count and returns its address.
 *
 */

struct page *ufs_get_locked_page(struct address_space *mapping,
				 pgoff_t index)
{
	struct page *page;

	page = find_lock_page(mapping, index);
	if (!page) {
		page = read_cache_page(mapping, index,
				       (filler_t*)mapping->a_ops->readpage,
				       NULL);

		if (IS_ERR(page)) {
			printk(KERN_ERR "ufs_change_blocknr: "
			       "read_cache_page error: ino %lu, index: %lu\n",
			       mapping->host->i_ino, index);
			goto out;
		}

		lock_page(page);

		if (unlikely(page->mapping == NULL)) {
			/* Truncate got there first */
			unlock_page(page);
			page_cache_release(page);
			page = NULL;
			goto out;
		}

		if (!PageUptodate(page) || PageError(page)) {
			unlock_page(page);
			page_cache_release(page);

			printk(KERN_ERR "ufs_change_blocknr: "
			       "can not read page: ino %lu, index: %lu\n",
			       mapping->host->i_ino, index);

			page = ERR_PTR(-EIO);
		}
	}
out:
	return page;
}
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
098d5af7	115	void ubh_ll_rw_block(int rw, struct ufs_buffer_head *ubh)
1da177e4	116	{
1da177e4 LT	117	if (!ubh)
1da177e4 LT	118	return;
098d5af7 ED	119
098d5af7 ED	120	ll_rw_block(rw, ubh->count, ubh->bh);
1da177e4 LT	121	}
	122
	123	void ubh_wait_on_buffer (struct ufs_buffer_head * ubh)
	124	{
	125	unsigned i;
	126	if (!ubh)
	127	return;
	128	for ( i = 0; i < ubh->count; i++ )
	129	wait_on_buffer (ubh->bh[i]);
	130	}
	131
1da177e4 LT	132	void ubh_bforget (struct ufs_buffer_head * ubh)
	133	{
	134	unsigned i;
	135	if (!ubh)
	136	return;
	137	for ( i = 0; i < ubh->count; i++ ) if ( ubh->bh[i] )
	138	bforget (ubh->bh[i]);
	139	}
	140
	141	int ubh_buffer_dirty (struct ufs_buffer_head * ubh)
	142	{
	143	unsigned i;
	144	unsigned result = 0;
	145	if (!ubh)
	146	return 0;
	147	for ( i = 0; i < ubh->count; i++ )
	148	result \|= buffer_dirty(ubh->bh[i]);
	149	return result;
	150	}
	151
	152	void _ubh_ubhcpymem_(struct ufs_sb_private_info * uspi,
	153	unsigned char * mem, struct ufs_buffer_head * ubh, unsigned size)
	154	{
	155	unsigned len, bhno;
	156	if (size > (ubh->count << uspi->s_fshift))
	157	size = ubh->count << uspi->s_fshift;
	158	bhno = 0;
	159	while (size) {
	160	len = min_t(unsigned int, size, uspi->s_fsize);
	161	memcpy (mem, ubh->bh[bhno]->b_data, len);
	162	mem += uspi->s_fsize;
	163	size -= len;
	164	bhno++;
	165	}
	166	}
	167
	168	void _ubh_memcpyubh_(struct ufs_sb_private_info * uspi,
	169	struct ufs_buffer_head * ubh, unsigned char * mem, unsigned size)
	170	{
	171	unsigned len, bhno;
	172	if (size > (ubh->count << uspi->s_fshift))
	173	size = ubh->count << uspi->s_fshift;
	174	bhno = 0;
	175	while (size) {
	176	len = min_t(unsigned int, size, uspi->s_fsize);
	177	memcpy (ubh->bh[bhno]->b_data, mem, len);
	178	mem += uspi->s_fsize;
	179	size -= len;
	180	bhno++;
	181	}
	182	}
	183
	184	dev_t
	185	ufs_get_inode_dev(struct super_block sb, struct ufs_inode_info ufsi)
	186	{
	187	__fs32 fs32;
	188	dev_t dev;
	189
	190	if ((UFS_SB(sb)->s_flags & UFS_ST_MASK) == UFS_ST_SUNx86)
	191	fs32 = ufsi->i_u1.i_data[1];
	192	else
	193	fs32 = ufsi->i_u1.i_data[0];
	194	fs32 = fs32_to_cpu(sb, fs32);
	195	switch (UFS_SB(sb)->s_flags & UFS_ST_MASK) {
196	case UFS_ST_SUNx86:
197	case UFS_ST_SUN:
198	if ((fs32 & 0xffff0000) == 0 \|\|
199	(fs32 & 0xffff0000) == 0xffff0000)
200	dev = old_decode_dev(fs32 & 0x7fff);
201	else
202	dev = MKDEV(sysv_major(fs32), sysv_minor(fs32));
203	break;
204
205	default:
206	dev = old_decode_dev(fs32);
207	break;
208	}
209	return dev;
210	}
211
212	void
213	ufs_set_inode_dev(struct super_block sb, struct ufs_inode_info ufsi, dev_t dev)
214	{
215	__fs32 fs32;
216
217	switch (UFS_SB(sb)->s_flags & UFS_ST_MASK) {
218	case UFS_ST_SUNx86:
219	case UFS_ST_SUN:
220	fs32 = sysv_encode_dev(dev);
221	if ((fs32 & 0xffff8000) == 0) {
222	fs32 = old_encode_dev(dev);
223	}
224	break;
225
226	default:
227	fs32 = old_encode_dev(dev);
228	break;
229	}
230	fs32 = cpu_to_fs32(sb, fs32);
231	if ((UFS_SB(sb)->s_flags & UFS_ST_MASK) == UFS_ST_SUNx86)
232	ufsi->i_u1.i_data[1] = fs32;
233	else
234	ufsi->i_u1.i_data[0] = fs32;
235	}
10e5dce0 ED	236
	237	/**
	238	* ufs_get_locked_page() - locate, pin and lock a pagecache page, if not exist
	239	* read it from disk.
	240	* @mapping: the address_space to search
	241	* @index: the page index
	242	*
	243	* Locates the desired pagecache page, if not exist we'll read it,
	244	* locks it, increments its reference
	245	* count and returns its address.
	246	*
	247	*/
	248
	249	struct page ufs_get_locked_page(struct address_space mapping,
	250	pgoff_t index)
	251	{
	252	struct page *page;
	253
10e5dce0 ED	254	page = find_lock_page(mapping, index);
	255	if (!page) {
	256	page = read_cache_page(mapping, index,
	257	(filler_t*)mapping->a_ops->readpage,
	258	NULL);
1fb32b7b	259
10e5dce0 ED	260	if (IS_ERR(page)) {
	261	printk(KERN_ERR "ufs_change_blocknr: "
	262	"read_cache_page error: ino %lu, index: %lu\n",
	263	mapping->host->i_ino, index);
	264	goto out;
	265	}
	266
	267	lock_page(page);
	268
1fb32b7b ED	269	if (unlikely(page->mapping == NULL)) {
	270	/* Truncate got there first */
	271	unlock_page(page);
	272	page_cache_release(page);
06fa45d3 ED	273	page = NULL;
06fa45d3 ED	274	goto out;
1fb32b7b ED	275	}
1fb32b7b ED	276
10e5dce0 ED	277	if (!PageUptodate(page) \|\| PageError(page)) {
	278	unlock_page(page);
	279	page_cache_release(page);
	280
	281	printk(KERN_ERR "ufs_change_blocknr: "
	282	"can not read page: ino %lu, index: %lu\n",
	283	mapping->host->i_ino, index);
	284
	285	page = ERR_PTR(-EIO);
10e5dce0 ED	286	}
10e5dce0 ED	287	}
10e5dce0 ED	288	out:
	289	return page;
	290	}