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Commit 49792c80 authored by Dmitry Monakhov's avatar Dmitry Monakhov Committed by Jan Kara
Browse files

ext3: add writepage sanity checks 



- There is theoretical possibility to perform writepage on
   RO superblock. Add explicit check for what case.
- Page must being locked before writepage.

Signed-off-by: default avatarDmitry Monakhov <dmonakhov@openvz.org>
Signed-off-by: default avatarJan Kara <jack@suse.cz>
parent 7eb4969e

fs/ext3/inode.c

+7 −0
Original line number Diff line number Diff line
@@ -1528,6 +1528,7 @@ static int ext3_ordered_writepage(struct page *page, 
	int err;



	J_ASSERT(PageLocked(page));

	WARN_ON_ONCE(IS_RDONLY(inode));



	/*

	 * We give up here if we're reentered, because it might be for a
@@ -1600,6 +1601,9 @@ static int ext3_writeback_writepage(struct page *page, 
	int ret = 0;

	int err;



	J_ASSERT(PageLocked(page));

	WARN_ON_ONCE(IS_RDONLY(inode));



	if (ext3_journal_current_handle())

		goto out_fail;
@@ -1642,6 +1646,9 @@ static int ext3_journalled_writepage(struct page *page, 
	int ret = 0;

	int err;



	J_ASSERT(PageLocked(page));

	WARN_ON_ONCE(IS_RDONLY(inode));



	if (ext3_journal_current_handle())

		goto no_write;