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Commit cca24370 authored by Miklos Szeredi's avatar Miklos Szeredi
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fuse: lock page in mkwrite 



Lock the page in fuse_page_mkwrite() to protect against a race with
fuse_writepage() where the page is redirtied before the actual writeback
begins.

Signed-off-by: default avatarMiklos Szeredi <mszeredi@suse.cz>
parent 385b1268

fs/fuse/file.c

+9 −6
Original line number Diff line number Diff line
@@ -1618,14 +1618,17 @@ static void fuse_vma_close(struct vm_area_struct *vma) 
static int fuse_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)

{

	struct page *page = vmf->page;

	/*

	 * Don't use page->mapping as it may become NULL from a

	 * concurrent truncate.

	 */

	struct inode *inode = vma->vm_file->f_mapping->host;

	struct inode *inode = file_inode(vma->vm_file);



	file_update_time(vma->vm_file);

	lock_page(page);

	if (page->mapping != inode->i_mapping) {

		unlock_page(page);

		return VM_FAULT_NOPAGE;

	}



	fuse_wait_on_page_writeback(inode, page->index);

	return 0;

	return VM_FAULT_LOCKED;

}



static const struct vm_operations_struct fuse_file_vm_ops = {