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authorDmitry Monakhov <dmonakhov@openvz.org>2010-03-02 15:51:02 +0300
committerJan Kara <jack@suse.cz>2010-03-05 00:20:27 +0100
commit49792c806d0bfd53afc789dcdf50dc9bed2c5b83 (patch)
treeb24280fa76abad273e0f009a9cfe49b594c2becf
parent7eb4969e04060dcf3fbd46af9c21b1059b853068 (diff)
downloadop-kernel-dev-49792c806d0bfd53afc789dcdf50dc9bed2c5b83.zip
op-kernel-dev-49792c806d0bfd53afc789dcdf50dc9bed2c5b83.tar.gz
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: Dmitry Monakhov <dmonakhov@openvz.org> Signed-off-by: Jan Kara <jack@suse.cz>
-rw-r--r--fs/ext3/inode.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/fs/ext3/inode.c b/fs/ext3/inode.c
index c0ff9d6..eda9121 100644
--- a/fs/ext3/inode.c
+++ b/fs/ext3/inode.c
@@ -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;
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