patch-1.3.67 linux/fs/nfs/mmap.c

• Lines: 116
• Date: Thu Jan 1 02:00:00 1970
• Orig file: v1.3.66/linux/fs/nfs/mmap.c
• Orig date: Mon Jan 8 14:10:28 1996

diff -u --recursive --new-file v1.3.66/linux/fs/nfs/mmap.c linux/fs/nfs/mmap.c
@@ -1,115 +0,0 @@
-/*
- *	fs/nfs/mmap.c	by Jon Tombs 15 Aug 1993
- *
- * This code is from
- *	linux/mm/mmap.c which was written by obz, Linus and Eric
- * and
- *	linux/mm/memory.c  by Linus Torvalds and others
- *
- *	Copyright (C) 1993
- *
- */
-
-#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/nfs_fs.h>
-
-#include <asm/segment.h>
-#include <asm/system.h>
-
-/*
- * Return a page for mmap. We need to start using the page cache,
- * because otherwise we can't share pages between processes..
- */
-static unsigned long nfs_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;
-	struct nfs_fattr fattr;
-
-	page = __get_free_page(GFP_KERNEL);
-	if (!page)
-		return page;
-	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;
-	}
-
-	n = NFS_SERVER(inode)->rsize; /* what we can read in one go */
-
-	for (i = 0; i < (PAGE_SIZE - clear); i += n) {
-		int hunk, result;
-
-		hunk = PAGE_SIZE - i;
-		if (hunk > n)
-			hunk = n;
-		result = nfs_proc_read(NFS_SERVER(inode), NFS_FH(inode),
-			pos, hunk, (char *) (page + i), &fattr, 0);
-		if (result < 0)
-			break;
-		pos += result;
-		if (result < n) {
-			i += result;
-			break;
-		}
-	}
-
-#ifdef doweneedthishere
-	nfs_refresh_inode(inode, &fattr);
-#endif
-
-	tmp = page + PAGE_SIZE;
-	if (clear > 0){
-		memset ((char*)(tmp-clear),0,clear);
-	}
-
-	return page;
-}
-
-struct vm_operations_struct nfs_file_mmap = {
-	NULL,			/* open */
-	NULL,			/* close */
-	NULL,			/* unmap */
-	NULL,			/* protect */
-	NULL,			/* sync */
-	NULL,			/* advise */
-	nfs_file_mmap_nopage,	/* nopage */
-	NULL,			/* wppage */
-	NULL,			/* swapout */
-	NULL,			/* swapin */
-};
-
-
-/* This is used for a general mmap of a nfs file */
-int nfs_mmap(struct inode * inode, struct file * file, struct vm_area_struct * vma)
-{
-	if (vma->vm_flags & VM_SHARED)	/* only PAGE_COW or read-only supported now */
-		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 = &nfs_file_mmap;
-	return 0;
-}