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>
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@ -1528,6 +1528,7 @@ static int ext3_ordered_writepage(struct page *page,
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int err;
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J_ASSERT(PageLocked(page));
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WARN_ON_ONCE(IS_RDONLY(inode));
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/*
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* We give up here if we're reentered, because it might be for a
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@ -1600,6 +1601,9 @@ static int ext3_writeback_writepage(struct page *page,
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int ret = 0;
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int err;
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J_ASSERT(PageLocked(page));
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WARN_ON_ONCE(IS_RDONLY(inode));
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if (ext3_journal_current_handle())
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goto out_fail;
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@ -1642,6 +1646,9 @@ static int ext3_journalled_writepage(struct page *page,
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int ret = 0;
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int err;
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J_ASSERT(PageLocked(page));
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WARN_ON_ONCE(IS_RDONLY(inode));
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if (ext3_journal_current_handle())
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goto no_write;
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