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staging: lustre: convert obd uuid hash to rhashtable

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The rhashtable data type is a perfect fit for the
export uuid hash table, so use that instead of
cfs_hash (which will eventually be removed).

As rhashtable supports lookups and insertions in atomic
context, there is no need to drop a spinlock while
inserting a new entry, which simplifies code quite a bit.

As there are no simple lookups on this hash table (only
insertions which might fail and take a spinlock), there is
no need to use rcu to free the exports.

Signed-off-by: NeilBrown <neilb@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
NeilBrown 2018-04-12 07:54:48 +10:00 • committed by Greg Kroah-Hartman
commit 4206c444e4
5 changed files with 80 additions and 125 deletions
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