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staging: lustre: replace libcfs_register_ioctl with a blocking notifier_chain

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libcfs allows other modules to register handlers for ioctls.
The implementation it uses for this is nearly identical to a
blocking notifier chain, so change to use that.

The biggest difference is that the return value from notifier has a
defined format, where libcfs_register_ioctl uses -EINVAL to mean
"continue".  This requires a little bit of conversion.

Signed-off-by: NeilBrown <neilb@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
NeilBrown 2018-05-21 14:35:12 +10:00 • committed by Greg Kroah-Hartman
commit 912a846027
6 changed files with 70 additions and 91 deletions
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