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Commit 97ae91bb authored by Kazuo Ito's avatar Kazuo Ito Committed by Trond Myklebust
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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: default avatarKazuo Ito <ito_kazuo_g3@lab.ntt.co.jp>
Signed-off-by: default avatarTrond 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;

	}