patch-2.3.24 linux/fs/fat/mmap.c

• Lines: 132
• Date: Wed Dec 31 16:00:00 1969
• Orig file: v2.3.23/linux/fs/fat/mmap.c
• Orig date: Fri Jul 2 15:15:51 1999

diff -u --recursive --new-file v2.3.23/linux/fs/fat/mmap.c linux/fs/fat/mmap.c
@@ -1,131 +0,0 @@
-/*
- *	linux/fs/fat/mmap.c
- *
- *	Written by Jacques Gelinas (jacques@solucorp.qc.ca)
- *	Inspired by fs/nfs/mmap.c (Jon Tombs 15 Aug 1993)
- *
- *	mmap handling for fat-based filesystems
- */
-
-#define ASC_LINUX_VERSION(V, P, S)	(((V) * 65536) + ((P) * 256) + (S))
-#include <linux/version.h>
-
-#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/msdos_fs.h>
-
-#include <asm/uaccess.h>
-#include <asm/system.h>
-
-/*
- * Fill in the supplied page for mmap
- */
-static unsigned long fat_file_mmap_nopage(
-	struct vm_area_struct * area,
-	unsigned long address,
-	int error_code)
-{
-	struct inode * inode = area->vm_file->f_dentry->d_inode;
-	unsigned long page;
-	unsigned int clear;
-	int pos;
-	long gap;	/* distance from eof to pos */
-
-	page = __get_free_page(GFP_KERNEL);
-	if (!page)
-		return page;
-	address &= PAGE_MASK;
-	pos = address - area->vm_start + area->vm_offset;
-
-	clear = 0;
-	gap = inode->i_size - pos;
-	if (gap <= 0){
-		/* mmaping beyond end of file */
-		clear = PAGE_SIZE;
-	}else{
-		int cur_read;
-		int need_read;
-		struct file filp;
-		if (gap < PAGE_SIZE){
-			clear = PAGE_SIZE - gap;
-		}
-		filp.f_reada = 0;
-		filp.f_pos = pos;
-		filp.f_dentry=area->vm_file->f_dentry;
-		need_read = PAGE_SIZE - clear;
-		{
-			mm_segment_t cur_fs = get_fs();
-			set_fs (KERNEL_DS);
-			cur_read = fat_file_read (&filp, (char*)page,
-						  need_read, &filp.f_pos);
-			set_fs (cur_fs);
-		}
-		if (cur_read != need_read){
-			printk ("MSDOS: Error while reading an mmap file %d <> %d\n"
-				,cur_read,need_read);
-		}
-	}
-	if (clear > 0){
-		memset ((char*)page+PAGE_SIZE-clear,0,clear);
-	}
-	return page;
-}
-
-struct vm_operations_struct fat_file_mmap = {
-	NULL,			/* open */
-	NULL,			/* close */
-	NULL,			/* unmap */
-	NULL,			/* protect */
-	NULL,			/* sync */
-	NULL,			/* advise */
-	fat_file_mmap_nopage,	/* nopage */
-	NULL,			/* wppage */
-	NULL			/* swapout */
-};
-
-/*
- * This is used for a general mmap of an msdos file
- * Returns 0 if ok, or a negative error code if not.
- */
-int fat_mmap(struct file * file, struct vm_area_struct * vma)
-{
-	struct inode *inode = file->f_dentry->d_inode;
-	if (MSDOS_SB(inode->i_sb)->cvf_format &&
-	    MSDOS_SB(inode->i_sb)->cvf_format->cvf_mmap)
-		return MSDOS_SB(inode->i_sb)->cvf_format->cvf_mmap(file,vma);
-
-	if (vma->vm_flags & VM_SHARED)	/* only PAGE_COW or read-only supported now */
-		return -EINVAL;
-	if (vma->vm_offset & (inode->i_sb->s_blocksize - 1))
-		return -EINVAL;
-	if (!inode->i_sb || !S_ISREG(inode->i_mode))
-		return -EACCES;
-	if (!IS_RDONLY(inode)) {
-		inode->i_atime = CURRENT_TIME;
-		mark_inode_dirty(inode);
-	}
-
-	vma->vm_ops = &fat_file_mmap;
-	return 0;
-}
-
-
-int fat_readpage(struct file *file, struct page * page)
-{
-	struct dentry * dentry = file->f_dentry;
-	struct inode * inode = dentry->d_inode;
-	if (MSDOS_SB(inode->i_sb)->cvf_format &&
-	    MSDOS_SB(inode->i_sb)->cvf_format->cvf_readpage)
-		return MSDOS_SB(inode->i_sb)->cvf_format->cvf_readpage(inode,page);
-	    
-	printk("fat_readpage called with no handler (shouldn't happen)\n");
-	return -1;
-}
-