Re: vxfs_readdir locking incorrect: add lock_kernel() or removeunlock_kernel()?

From: Andrew Morton
Date: Mon Jul 24 2006 - 20:22:16 EST

On Mon, 24 Jul 2006 15:42:17 -0700
Josh Triplett <josht@xxxxxxxxxx> wrote:

> Commit 7b2fd697427e73c81d5fa659efd91bd07d303b0e in the historical GIT
> tree stopped calling the readdir member of a file_operations struct with
> the big kernel lock held, and fixed up all the readdir functions to do
> their own locking. However, that change added calls to unlock_kernel()
> in vxfs_readdir (fs/freevxfs/vxfs_lookup.c), but no call to
> lock_kernel().

That would appear to imply that nobody has used freevxfs in four years.

> Should vxfs_readdir call lock_kernel(), or should the
> calls to unlock_kernel() go away?

I don't see anything in there which needs the locking, apart from perhaps
f_pos updates. But it's probably best to add the lock_kernel() - this is a
bugfixing exercise, not a remove-BKL-from-freevxfs exercise.
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