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NFS: Add the helper nfs_vm_page_mkwrite 

This is needed in order to set up a proper nfs_page request for mmapped
files.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust 2007-07-22 17:09:05 -04:00
parent bbf25010f1
commit 94387fb1aa
1 changed files with 33 additions and 2 deletions
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35
fs/nfs/file.c
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@ -33,6 +33,7 @@
#include <asm/system.h>
#include "delegation.h"
#include "internal.h"
#include "iostat.h"
#define NFSDBG_FACILITY NFSDBG_FILE
@ -55,6 +56,8 @@ static int nfs_lock(struct file *filp, int cmd, struct file_lock *fl);
static int nfs_flock(struct file *filp, int cmd, struct file_lock *fl);
static int nfs_setlease(struct file *file, long arg, struct file_lock **fl);
static struct vm_operations_struct nfs_file_vm_ops;
const struct file_operations nfs_file_operations = {
.llseek = nfs_file_llseek,
.read = do_sync_read,
@ -257,8 +260,11 @@ nfs_file_mmap(struct file * file, struct vm_area_struct * vma)
dentry->d_parent->d_name.name, dentry->d_name.name);
status = nfs_revalidate_mapping(inode, file->f_mapping);
if (!status)
status = generic_file_mmap(file, vma);
if (!status) {
vma->vm_ops = &nfs_file_vm_ops;
vma->vm_flags |= VM_CAN_NONLINEAR;
file_accessed(file);
}
return status;
}
@ -346,6 +352,31 @@ const struct address_space_operations nfs_file_aops = {
.launder_page = nfs_launder_page,
};
static int nfs_vm_page_mkwrite(struct vm_area_struct *vma, struct page *page)
{
struct file *filp = vma->vm_file;
unsigned pagelen;
int ret = -EINVAL;
lock_page(page);
if (page->mapping != vma->vm_file->f_path.dentry->d_inode->i_mapping)
goto out_unlock;
pagelen = nfs_page_length(page);
if (pagelen == 0)
goto out_unlock;
ret = nfs_prepare_write(filp, page, 0, pagelen);
if (!ret)
ret = nfs_commit_write(filp, page, 0, pagelen);
out_unlock:
unlock_page(page);
return ret;
}
static struct vm_operations_struct nfs_file_vm_ops = {
.fault = filemap_fault,
.page_mkwrite = nfs_vm_page_mkwrite,
};
static ssize_t nfs_file_write(struct kiocb *iocb, const struct iovec *iov,
unsigned long nr_segs, loff_t pos)
{