vfs: Add BUG_ON for delayed and unwritten flags in submit_bh()
The BH_Delay and BH_Unwritten flags should never leak out to submit_bh(). So add some BUG_ON() checks to submit_bh so we can get a stack trace and determine how and why this might have happened. (Note that only XFS and ext4 use these buffer head flags, and XFS does not use submit_bh(). So this patch should only modify behavior for ext4.) Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu> Cc: linux-fsdevel@vger.kernel.org
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@ -2933,6 +2933,8 @@ int submit_bh(int rw, struct buffer_head * bh)
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BUG_ON(!buffer_locked(bh));
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BUG_ON(!buffer_mapped(bh));
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BUG_ON(!bh->b_end_io);
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BUG_ON(buffer_delay(bh));
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BUG_ON(buffer_unwritten(bh));
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/*
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* Mask in barrier bit for a write (could be either a WRITE or a
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