From: Kautuk Consul <consul.kautuk@gmail.com>
Date: Mon, 20 Feb 2012 08:46:12 +0000 (-0500)
Subject: exofs: readpage_strip: Add a BUG_ON to check for PageLocked(page)
X-Git-Tag: v3.6-rc2~32^2~4
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=0e8d96dd2c99405c707f540b5922ec869b848979;p=profile%2Fcommon%2Fkernel-common.git

exofs: readpage_strip: Add a BUG_ON to check for PageLocked(page)

readpage_strip can be called from several code paths all of which
require that the page be locked before any operations are carried
out.

Since we export the exofs_readpage callback to the VFS, add a
BUG_ON to check for PageLocked(page) to make sure that this
understanding is never compromised.

Signed-off-by: Kautuk Consul <consul.kautuk@gmail.com>
Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
---

diff --git a/fs/exofs/inode.c b/fs/exofs/inode.c
index 5badb0c..9a5ed30 100644
--- a/fs/exofs/inode.c
+++ b/fs/exofs/inode.c
@@ -389,6 +389,8 @@ static int readpage_strip(void *data, struct page *page)
 	size_t len;
 	int ret;
 
+	BUG_ON(!PageLocked(page));
+
 	/* FIXME: Just for debugging, will be removed */
 	if (PageUptodate(page))
 		EXOFS_ERR("PageUptodate(0x%lx, 0x%lx)\n", pcol->inode->i_ino,