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quota: Cleanup list iteration in dqcache_shrink_scan() 

Use list_first_entry() and list_empty() instead of opencoded variants.

Reviewed-by: Matthew Wilcox <mawilcox@microsoft.com>
Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Jan Kara 2018-06-11 12:14:45 +02:00
parent 9560ba306d
commit 1822193b5d
1 changed files with 2 additions and 5 deletions
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7
fs/quota/dquot.c
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@ -711,21 +711,18 @@ EXPORT_SYMBOL(dquot_quota_sync);
static unsigned long
dqcache_shrink_scan(struct shrinker *shrink, struct shrink_control *sc)
{
struct list_head *head;
struct dquot *dquot;
unsigned long freed = 0;
spin_lock(&dq_list_lock);
head = free_dquots.next;
while (head != &free_dquots && sc->nr_to_scan) {
dquot = list_entry(head, struct dquot, dq_free);
while (!list_empty(&free_dquots) && sc->nr_to_scan) {
dquot = list_first_entry(&free_dquots, struct dquot, dq_free);
remove_dquot_hash(dquot);
remove_free_dquot(dquot);
remove_inuse(dquot);
do_destroy_dquot(dquot);
sc->nr_to_scan--;
freed++;
head = free_dquots.next;
}
spin_unlock(&dq_list_lock);
return freed;