[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 "ufs.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)
{
	__u32 fs32;
	dev_t dev;

	if ((UFS_SB(sb)->s_flags & UFS_ST_MASK) == UFS_ST_SUNx86)
		fs32 = fs32_to_cpu(sb, ufsi->i_u1.i_data[1]);
	else
		fs32 = fs32_to_cpu(sb, ufsi->i_u1.i_data[0]);
	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)
{
	__u32 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;
	}
	if ((UFS_SB(sb)->s_flags & UFS_ST_MASK) == UFS_ST_SUNx86)
		ufsi->i_u1.i_data[1] = cpu_to_fs32(sb, fs32);
	else
		ufsi->i_u1.i_data[0] = cpu_to_fs32(sb, 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_mapping_page(mapping, index, NULL);

		if (IS_ERR(page)) {
			printk(KERN_ERR "ufs_change_blocknr: "
			       "read_mapping_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
bcd6d4ec	14	#include "ufs.h"
1da177e4 LT	15	#include "swab.h"
	16	#include "util.h"
	17
1da177e4 LT	18	struct ufs_buffer_head * _ubh_bread_ (struct ufs_sb_private_info * uspi,
	19	struct super_block *sb, u64 fragment, u64 size)
	20	{
	21	struct ufs_buffer_head * ubh;
	22	unsigned i, j ;
	23	u64 count = 0;
	24	if (size & ~uspi->s_fmask)
	25	return NULL;
	26	count = size >> uspi->s_fshift;
	27	if (count > UFS_MAXFRAG)
	28	return NULL;
	29	ubh = (struct ufs_buffer_head *)
	30	kmalloc (sizeof (struct ufs_buffer_head), GFP_KERNEL);
	31	if (!ubh)
	32	return NULL;
	33	ubh->fragment = fragment;
	34	ubh->count = count;
	35	for (i = 0; i < count; i++)
	36	if (!(ubh->bh[i] = sb_bread(sb, fragment + i)))
	37	goto failed;
	38	for (; i < UFS_MAXFRAG; i++)
	39	ubh->bh[i] = NULL;
	40	return ubh;
	41	failed:
	42	for (j = 0; j < i; j++)
	43	brelse (ubh->bh[j]);
	44	kfree(ubh);
	45	return NULL;
	46	}
	47
	48	struct ufs_buffer_head * ubh_bread_uspi (struct ufs_sb_private_info * uspi,
	49	struct super_block *sb, u64 fragment, u64 size)
	50	{
	51	unsigned i, j;
	52	u64 count = 0;
	53	if (size & ~uspi->s_fmask)
	54	return NULL;
	55	count = size >> uspi->s_fshift;
	56	if (count <= 0 \|\| count > UFS_MAXFRAG)
	57	return NULL;
9695ef16 ED	58	USPI_UBH(uspi)->fragment = fragment;
9695ef16 ED	59	USPI_UBH(uspi)->count = count;
1da177e4	60	for (i = 0; i < count; i++)
9695ef16	61	if (!(USPI_UBH(uspi)->bh[i] = sb_bread(sb, fragment + i)))
1da177e4 LT	62	goto failed;
1da177e4 LT	63	for (; i < UFS_MAXFRAG; i++)
9695ef16 ED	64	USPI_UBH(uspi)->bh[i] = NULL;
9695ef16 ED	65	return USPI_UBH(uspi);
1da177e4 LT	66	failed:
1da177e4 LT	67	for (j = 0; j < i; j++)
9695ef16	68	brelse (USPI_UBH(uspi)->bh[j]);
1da177e4 LT	69	return NULL;
	70	}
	71
	72	void ubh_brelse (struct ufs_buffer_head * ubh)
	73	{
	74	unsigned i;
	75	if (!ubh)
	76	return;
	77	for (i = 0; i < ubh->count; i++)
	78	brelse (ubh->bh[i]);
	79	kfree (ubh);
	80	}
	81
	82	void ubh_brelse_uspi (struct ufs_sb_private_info * uspi)
	83	{
	84	unsigned i;
9695ef16	85	if (!USPI_UBH(uspi))
1da177e4	86	return;
9695ef16 ED	87	for ( i = 0; i < USPI_UBH(uspi)->count; i++ ) {
	88	brelse (USPI_UBH(uspi)->bh[i]);
	89	USPI_UBH(uspi)->bh[i] = NULL;
1da177e4 LT	90	}
	91	}
	92
	93	void ubh_mark_buffer_dirty (struct ufs_buffer_head * ubh)
	94	{
	95	unsigned i;
	96	if (!ubh)
	97	return;
	98	for ( i = 0; i < ubh->count; i++ )
	99	mark_buffer_dirty (ubh->bh[i]);
	100	}
	101
	102	void ubh_mark_buffer_uptodate (struct ufs_buffer_head * ubh, int flag)
	103	{
	104	unsigned i;
	105	if (!ubh)
	106	return;
	107	if (flag) {
	108	for ( i = 0; i < ubh->count; i++ )
	109	set_buffer_uptodate (ubh->bh[i]);
	110	} else {
	111	for ( i = 0; i < ubh->count; i++ )
	112	clear_buffer_uptodate (ubh->bh[i]);
	113	}
	114	}
	115
098d5af7	116	void ubh_ll_rw_block(int rw, struct ufs_buffer_head *ubh)
1da177e4	117	{
1da177e4 LT	118	if (!ubh)
1da177e4 LT	119	return;
098d5af7 ED	120
098d5af7 ED	121	ll_rw_block(rw, ubh->count, ubh->bh);
1da177e4 LT	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	{
44aa5359	188	__u32 fs32;
1da177e4 LT	189	dev_t dev;
	190
	191	if ((UFS_SB(sb)->s_flags & UFS_ST_MASK) == UFS_ST_SUNx86)
44aa5359	192	fs32 = fs32_to_cpu(sb, ufsi->i_u1.i_data[1]);
1da177e4	193	else
44aa5359	194	fs32 = fs32_to_cpu(sb, ufsi->i_u1.i_data[0]);
1da177e4 LT	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	{
44aa5359	215	__u32 fs32;
1da177e4 LT	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	}
1da177e4	230	if ((UFS_SB(sb)->s_flags & UFS_ST_MASK) == UFS_ST_SUNx86)
44aa5359	231	ufsi->i_u1.i_data[1] = cpu_to_fs32(sb, fs32);
1da177e4	232	else
44aa5359	233	ufsi->i_u1.i_data[0] = cpu_to_fs32(sb, fs32);
1da177e4	234	}
10e5dce0 ED	235
	236	/**
	237	* ufs_get_locked_page() - locate, pin and lock a pagecache page, if not exist
	238	* read it from disk.
	239	* @mapping: the address_space to search
	240	* @index: the page index
	241	*
	242	* Locates the desired pagecache page, if not exist we'll read it,
	243	* locks it, increments its reference
	244	* count and returns its address.
	245	*
	246	*/
	247
	248	struct page ufs_get_locked_page(struct address_space mapping,
	249	pgoff_t index)
	250	{
	251	struct page *page;
	252
10e5dce0 ED	253	page = find_lock_page(mapping, index);
10e5dce0 ED	254	if (!page) {
6fe6900e	255	page = read_mapping_page(mapping, index, NULL);
1fb32b7b	256
10e5dce0 ED	257	if (IS_ERR(page)) {
10e5dce0 ED	258	printk(KERN_ERR "ufs_change_blocknr: "
6fe6900e	259	"read_mapping_page error: ino %lu, index: %lu\n",
10e5dce0 ED	260	mapping->host->i_ino, index);
	261	goto out;
	262	}
	263
	264	lock_page(page);
	265
1fb32b7b ED	266	if (unlikely(page->mapping == NULL)) {
	267	/* Truncate got there first */
	268	unlock_page(page);
	269	page_cache_release(page);
06fa45d3 ED	270	page = NULL;
06fa45d3 ED	271	goto out;
1fb32b7b ED	272	}
1fb32b7b ED	273
10e5dce0 ED	274	if (!PageUptodate(page) \|\| PageError(page)) {
	275	unlock_page(page);
	276	page_cache_release(page);
	277
	278	printk(KERN_ERR "ufs_change_blocknr: "
	279	"can not read page: ino %lu, index: %lu\n",
	280	mapping->host->i_ino, index);
	281
	282	page = ERR_PTR(-EIO);
10e5dce0 ED	283	}
10e5dce0 ED	284	}
10e5dce0 ED	285	out:
	286	return page;
	287	}