283 lines
6.0 KiB
C
283 lines
6.0 KiB
C
/*
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* linux/fs/ufs/util.c
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*
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* Copyright (C) 1998
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* Daniel Pirkl <daniel.pirkl@email.cz>
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* Charles University, Faculty of Mathematics and Physics
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*/
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#include <linux/string.h>
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#include <linux/slab.h>
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#include <linux/buffer_head.h>
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#include "ufs_fs.h"
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#include "ufs.h"
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#include "swab.h"
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#include "util.h"
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struct ufs_buffer_head * _ubh_bread_ (struct ufs_sb_private_info * uspi,
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struct super_block *sb, u64 fragment, u64 size)
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{
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struct ufs_buffer_head * ubh;
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unsigned i, j ;
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u64 count = 0;
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if (size & ~uspi->s_fmask)
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return NULL;
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count = size >> uspi->s_fshift;
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if (count > UFS_MAXFRAG)
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return NULL;
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ubh = kmalloc (sizeof (struct ufs_buffer_head), GFP_NOFS);
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if (!ubh)
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return NULL;
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ubh->fragment = fragment;
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ubh->count = count;
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for (i = 0; i < count; i++)
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if (!(ubh->bh[i] = sb_bread(sb, fragment + i)))
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goto failed;
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for (; i < UFS_MAXFRAG; i++)
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ubh->bh[i] = NULL;
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return ubh;
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failed:
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for (j = 0; j < i; j++)
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brelse (ubh->bh[j]);
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kfree(ubh);
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return NULL;
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}
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struct ufs_buffer_head * ubh_bread_uspi (struct ufs_sb_private_info * uspi,
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struct super_block *sb, u64 fragment, u64 size)
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{
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unsigned i, j;
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u64 count = 0;
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if (size & ~uspi->s_fmask)
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return NULL;
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count = size >> uspi->s_fshift;
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if (count <= 0 || count > UFS_MAXFRAG)
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return NULL;
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USPI_UBH(uspi)->fragment = fragment;
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USPI_UBH(uspi)->count = count;
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for (i = 0; i < count; i++)
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if (!(USPI_UBH(uspi)->bh[i] = sb_bread(sb, fragment + i)))
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goto failed;
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for (; i < UFS_MAXFRAG; i++)
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USPI_UBH(uspi)->bh[i] = NULL;
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return USPI_UBH(uspi);
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failed:
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for (j = 0; j < i; j++)
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brelse (USPI_UBH(uspi)->bh[j]);
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return NULL;
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}
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void ubh_brelse (struct ufs_buffer_head * ubh)
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{
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unsigned i;
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if (!ubh)
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return;
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for (i = 0; i < ubh->count; i++)
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brelse (ubh->bh[i]);
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kfree (ubh);
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}
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void ubh_brelse_uspi (struct ufs_sb_private_info * uspi)
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{
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unsigned i;
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if (!USPI_UBH(uspi))
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return;
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for ( i = 0; i < USPI_UBH(uspi)->count; i++ ) {
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brelse (USPI_UBH(uspi)->bh[i]);
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USPI_UBH(uspi)->bh[i] = NULL;
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}
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}
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void ubh_mark_buffer_dirty (struct ufs_buffer_head * ubh)
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{
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unsigned i;
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if (!ubh)
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return;
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for ( i = 0; i < ubh->count; i++ )
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mark_buffer_dirty (ubh->bh[i]);
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}
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void ubh_mark_buffer_uptodate (struct ufs_buffer_head * ubh, int flag)
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{
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unsigned i;
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if (!ubh)
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return;
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if (flag) {
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for ( i = 0; i < ubh->count; i++ )
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set_buffer_uptodate (ubh->bh[i]);
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} else {
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for ( i = 0; i < ubh->count; i++ )
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clear_buffer_uptodate (ubh->bh[i]);
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}
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}
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void ubh_sync_block(struct ufs_buffer_head *ubh)
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{
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if (ubh) {
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unsigned i;
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for (i = 0; i < ubh->count; i++)
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write_dirty_buffer(ubh->bh[i], WRITE);
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for (i = 0; i < ubh->count; i++)
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wait_on_buffer(ubh->bh[i]);
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}
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}
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void ubh_bforget (struct ufs_buffer_head * ubh)
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{
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unsigned i;
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if (!ubh)
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return;
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for ( i = 0; i < ubh->count; i++ ) if ( ubh->bh[i] )
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bforget (ubh->bh[i]);
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}
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int ubh_buffer_dirty (struct ufs_buffer_head * ubh)
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{
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unsigned i;
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unsigned result = 0;
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if (!ubh)
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return 0;
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for ( i = 0; i < ubh->count; i++ )
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result |= buffer_dirty(ubh->bh[i]);
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return result;
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}
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void _ubh_ubhcpymem_(struct ufs_sb_private_info * uspi,
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unsigned char * mem, struct ufs_buffer_head * ubh, unsigned size)
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{
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unsigned len, bhno;
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if (size > (ubh->count << uspi->s_fshift))
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size = ubh->count << uspi->s_fshift;
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bhno = 0;
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while (size) {
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len = min_t(unsigned int, size, uspi->s_fsize);
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memcpy (mem, ubh->bh[bhno]->b_data, len);
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mem += uspi->s_fsize;
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size -= len;
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bhno++;
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}
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}
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void _ubh_memcpyubh_(struct ufs_sb_private_info * uspi,
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struct ufs_buffer_head * ubh, unsigned char * mem, unsigned size)
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{
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unsigned len, bhno;
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if (size > (ubh->count << uspi->s_fshift))
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size = ubh->count << uspi->s_fshift;
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bhno = 0;
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while (size) {
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len = min_t(unsigned int, size, uspi->s_fsize);
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memcpy (ubh->bh[bhno]->b_data, mem, len);
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mem += uspi->s_fsize;
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size -= len;
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bhno++;
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}
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}
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dev_t
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ufs_get_inode_dev(struct super_block *sb, struct ufs_inode_info *ufsi)
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{
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__u32 fs32;
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dev_t dev;
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if ((UFS_SB(sb)->s_flags & UFS_ST_MASK) == UFS_ST_SUNx86)
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fs32 = fs32_to_cpu(sb, ufsi->i_u1.i_data[1]);
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else
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fs32 = fs32_to_cpu(sb, ufsi->i_u1.i_data[0]);
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switch (UFS_SB(sb)->s_flags & UFS_ST_MASK) {
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case UFS_ST_SUNx86:
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case UFS_ST_SUN:
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if ((fs32 & 0xffff0000) == 0 ||
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(fs32 & 0xffff0000) == 0xffff0000)
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dev = old_decode_dev(fs32 & 0x7fff);
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else
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dev = MKDEV(sysv_major(fs32), sysv_minor(fs32));
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break;
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default:
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dev = old_decode_dev(fs32);
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break;
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}
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return dev;
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}
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void
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ufs_set_inode_dev(struct super_block *sb, struct ufs_inode_info *ufsi, dev_t dev)
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{
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__u32 fs32;
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switch (UFS_SB(sb)->s_flags & UFS_ST_MASK) {
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case UFS_ST_SUNx86:
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case UFS_ST_SUN:
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fs32 = sysv_encode_dev(dev);
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if ((fs32 & 0xffff8000) == 0) {
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fs32 = old_encode_dev(dev);
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}
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break;
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default:
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fs32 = old_encode_dev(dev);
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break;
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}
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if ((UFS_SB(sb)->s_flags & UFS_ST_MASK) == UFS_ST_SUNx86)
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ufsi->i_u1.i_data[1] = cpu_to_fs32(sb, fs32);
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else
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ufsi->i_u1.i_data[0] = cpu_to_fs32(sb, fs32);
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}
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/**
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* ufs_get_locked_page() - locate, pin and lock a pagecache page, if not exist
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* read it from disk.
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* @mapping: the address_space to search
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* @index: the page index
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*
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* Locates the desired pagecache page, if not exist we'll read it,
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* locks it, increments its reference
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* count and returns its address.
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*
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*/
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struct page *ufs_get_locked_page(struct address_space *mapping,
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pgoff_t index)
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{
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struct page *page;
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page = find_lock_page(mapping, index);
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if (!page) {
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page = read_mapping_page(mapping, index, NULL);
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if (IS_ERR(page)) {
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printk(KERN_ERR "ufs_change_blocknr: "
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"read_mapping_page error: ino %lu, index: %lu\n",
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mapping->host->i_ino, index);
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goto out;
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}
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lock_page(page);
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if (unlikely(page->mapping == NULL)) {
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/* Truncate got there first */
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unlock_page(page);
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page_cache_release(page);
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page = NULL;
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goto out;
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}
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if (!PageUptodate(page) || PageError(page)) {
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unlock_page(page);
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page_cache_release(page);
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printk(KERN_ERR "ufs_change_blocknr: "
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"can not read page: ino %lu, index: %lu\n",
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mapping->host->i_ino, index);
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page = ERR_PTR(-EIO);
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}
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}
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out:
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return page;
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}
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