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quota: reclaim least recently used dquots

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The dquots in the free_dquots list are not reclaimed in LRU way.
put_dquot_last() puts entries to the tail and dqcache_shrink_scan()
frees from the tail. Free unreferenced dquots in LRU order because it
seems more reasonable than freeing most recently used.

Signed-off-by: Greg Thelen <gthelen@google.com>
Signed-off-by: Shakeel Butt <shakeelb@google.com>
Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Greg Thelen 2018-06-07 18:37:59 -07:00 • committed by Jan Kara
parent 81e97f0137
commit 9560ba306d
1 changed files with 2 additions and 2 deletions
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4
fs/quota/dquot.c
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@ -716,7 +716,7 @@ dqcache_shrink_scan(struct shrinker *shrink, struct shrink_control *sc)
unsigned long freed = 0;
spin_lock(&dq_list_lock);
head = free_dquots.prev;
head = free_dquots.next;
while (head != &free_dquots && sc->nr_to_scan) {
dquot = list_entry(head, struct dquot, dq_free);
remove_dquot_hash(dquot);
@ -725,7 +725,7 @@ dqcache_shrink_scan(struct shrinker *shrink, struct shrink_control *sc)
do_destroy_dquot(dquot);
sc->nr_to_scan--;
freed++;
head = free_dquots.prev;
head = free_dquots.next;
}
spin_unlock(&dq_list_lock);
return freed;