Commit 97ae91bb authored Feb 14, 2019 by Kazuo Ito Committed by Trond Myklebust Feb 20, 2019

pNFS: Fix potential corruption of page being written

nfs_want_read_modify_write() didn't check for !PagePrivate when pNFS
block or SCSI layout was in use, therefore we could lose data forever
if the page being written was filled by a read before completion.

Signed-off-by: Kazuo Ito <ito_kazuo_g3@lab.ntt.co.jp>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>

parent bf211ca1

fs/nfs/file.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -299,7 +299,7 @@ static int nfs_want_read_modify_write(struct file file, struct page page,
		unsigned int end = offset + len;

		if (pnfs_ld_read_whole_page(file->f_mapping->host)) {
		if (!PageUptodate(page))
		if (!PageUptodate(page) && !PagePrivate(page))
		return 1;
		return 0;
		}