staging: lustre: convert osc_quota hash to rhashtable

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As this is indexed by an integer, an extensible array
or extensible bitmap would be better.
If/when xarray lands, we should change to use that.

For now, just a simple conversion to rhashtable.

When removing an entry, we need to hold rcu_read_lock()
across the lookup and remove in case we race with another thread
performing a removal.  This means we need to use call_rcu()
to free the quota info so we need an rcu_head in there, which
unfortunately doubles the size of the structure.

Signed-off-by: NeilBrown <neilb@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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NeilBrown 2018-04-12 07:54:48 +10:00 • committed by Greg Kroah-Hartman

parent 4206c444e4

commit 55161065d0

3 changed files with 48 additions and 95 deletions

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2

drivers/staging/lustre/lustre/include/obd.h

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5

drivers/staging/lustre/lustre/osc/osc_internal.h

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138

drivers/staging/lustre/lustre/osc/osc_quota.c

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