/* *  mmap.c * *  Copyright (C) 1995, 1996 by Paal-Kr. Engstad and Volker Lendecke * */#ifndef NO_MM#include <linux/stat.h>#include <linux/sched.h>#include <linux/kernel.h>#include <linux/mm.h>#include <linux/shm.h>#include <linux/errno.h>#include <linux/mman.h>#include <linux/string.h>#include <linux/malloc.h>#include <linux/smb_fs.h>#include <linux/fcntl.h>#include <asm/segment.h>#include <asm/system.h>/* * Fill in the supplied page for mmap */static unsigned longsmb_file_mmap_nopage(struct vm_area_struct *area,		     unsigned long address, int no_share){	struct inode *inode = area->vm_inode;	unsigned long page;	unsigned int clear;	unsigned long tmp;	int n;	int i;	int pos;	page = __get_free_page(GFP_KERNEL);	if (!page)		return 0;	address &= PAGE_MASK;	pos = address - area->vm_start + area->vm_offset;	clear = 0;	if (address + PAGE_SIZE > area->vm_end)	{		clear = address + PAGE_SIZE - area->vm_end;	}	/* what we can read in one go */	n = SMB_SERVER(inode)->max_xmit - SMB_HEADER_LEN - 5 * 2 - 3 - 10;	if (smb_make_open(inode, O_RDONLY) < 0)	{		clear = PAGE_SIZE;	} else	{		for (i = 0; i < (PAGE_SIZE - clear); i += n)		{			int hunk, result;			hunk = PAGE_SIZE - i;			if (hunk > n)				hunk = n;			DDPRINTK("smb_file_mmap_nopage: reading\n");			DDPRINTK("smb_file_mmap_nopage: pos = %d\n", pos);			result = smb_proc_read(SMB_SERVER(inode),					       SMB_FINFO(inode), pos, hunk,					       (char *) (page + i), 0);			DDPRINTK("smb_file_mmap_nopage: result= %d\n", result);			if (result < 0)				break;			pos += result;			if (result < n)			{				i += result;				break;			}		}	}	tmp = page + PAGE_SIZE;	while (clear--)	{		*(char *) --tmp = 0;	}	return page;}struct vm_operations_struct smb_file_mmap ={	NULL,			/* open */	NULL,			/* close */	NULL,			/* unmap */	NULL,			/* protect */	NULL,			/* sync */	NULL,			/* advise */	smb_file_mmap_nopage,	/* nopage */	NULL,			/* wppage */	NULL,			/* swapout */	NULL,			/* swapin */};/* This is used for a general mmap of a smb file */intsmb_mmap(struct inode *inode, struct file *file, struct vm_area_struct *vma){	DPRINTK("smb_mmap: called\n");	/* only PAGE_COW or read-only supported now */	if (vma->vm_flags & VM_SHARED)		return -EINVAL;	if (!inode->i_sb || !S_ISREG(inode->i_mode))		return -EACCES;	if (!IS_RDONLY(inode))	{		inode->i_atime = CURRENT_TIME;		inode->i_dirt = 1;	}	vma->vm_inode = inode;	inode->i_count++;	vma->vm_ops = &smb_file_mmap;	return 0;}#endif /* NO_MM */