quota: Remove dq_wait_unused from dquot

Currently every dquot carries a wait_queue_head_t used only when we are
turning quotas off to wait for last users to drop dquot references.
Since such rare case is not performance sensitive in any means, just use
a global waitqueue for this and save space in struct dquot. Also convert
the logic to use wait_event() instead of open-coding it.

Signed-off-by: Jan Kara <jack@suse.cz>

1 files changed, 0 insertions, 1 deletions

diff --git a/include/linux/quota.h b/include/linux/quota.h
index 3a6df7461642..ad6809f099ac 100644
--- a/include/linux/quota.h
+++ b/include/linux/quota.h
@@ -299,7 +299,6 @@ struct dquot {
         struct list_head dq_dirty;      /* List of dirty dquots */
         struct mutex dq_lock;           /* dquot IO lock */
         atomic_t dq_count;              /* Use count */
-        wait_queue_head_t dq_wait_unused;       /* Wait queue for dquot to become unused */
         struct super_block *dq_sb;      /* superblock this applies to */
         struct kqid dq_id;              /* ID this applies to (uid, gid, projid) */
         loff_t dq_off;                  /* Offset of dquot on disk */