/*
* Write an mmapped page to the server.
*/
int
nfs_writepage(struct page *page)
{
struct inode *inode = page->mapping->host;
unsigned long end_index;
unsigned offset = PAGE_CACHE_SIZE;
int inode_referenced = 0;
int err;
/*
* Note: We need to ensure that we have a reference to the inode
* if we are to do asynchronous writes. If not, waiting
* in nfs_wait_on_request() may deadlock with clear_inode().
*
* If igrab() fails here, then it is in any case safe to
* call nfs_wb_page(), since there will be no pending writes.
*/
if (igrab(inode) != 0)
inode_referenced = 1;
end_index = inode->i_size >> PAGE_CACHE_SHIFT;
/* Ensure we've flushed out any previous writes */
nfs_wb_page(inode,page);
/* easy case */
if (page->index < end_index)
goto do_it;
/* things got complicated... */
offset = inode->i_size & (PAGE_CACHE_SIZE-1);
/* OK, are we completely out? */
err = -EIO;
if (page->index >= end_index+1 || !offset)
goto out;
do_it:
lock_kernel();
if (NFS_SERVER(inode)->wsize >= PAGE_CACHE_SIZE && !IS_SYNC(inode) &&
inode_referenced) {
err = nfs_writepage_async(NULL, inode, page, 0, offset);
if (err >= 0)
err = 0;
} else {
err = nfs_writepage_sync(NULL, inode, page, 0, offset);
if (err == offset)
err = 0;
}
unlock_kernel();
out:
UnlockPage(page);
if (inode_referenced)
iput(inode);
return err;
}
/*
* Write an mmapped page to the server.
*/
int
nfs_writepage(struct page *page)
{
struct inode *inode;
unsigned long end_index;
unsigned offset = PAGE_CACHE_SIZE;
int err;
struct address_space *mapping = page->mapping;
if (!mapping)
BUG();
inode = mapping->host;
if (!inode)
BUG();
end_index = inode->i_size >> PAGE_CACHE_SHIFT;
/* Ensure we've flushed out any previous writes */
nfs_wb_page(inode,page);
/* easy case */
if (page->index < end_index)
goto do_it;
/* things got complicated... */
offset = inode->i_size & (PAGE_CACHE_SIZE-1);
/* OK, are we completely out? */
err = -EIO;
if (page->index >= end_index+1 || !offset)
goto out;
do_it:
lock_kernel();
if (NFS_SERVER(inode)->wsize >= PAGE_CACHE_SIZE && !IS_SYNC(inode)) {
err = nfs_writepage_async(NULL, inode, page, 0, offset);
if (err >= 0)
err = 0;
} else {
err = nfs_writepage_sync(NULL, inode, page, 0, offset);
if (err == offset)
err = 0;
}
unlock_kernel();
out:
UnlockPage(page);
return err;
}