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