quota: check time limit when back out space/inode change

When we fail from allocating inode/space, we back out
the change we already did. In a special case which has
exceeded soft limit by the change, we should also check
time limit and reset it properly.
Signed-off-by: Chengguang Xu <cgxu519@gmx.com>
Signed-off-by: Jan Kara <jack@suse.cz>

fs/quota/dquot.c

@@ -1681,13 +1681,11 @@ int __dquot_alloc_space(struct inode *inode, qsize_t number, int flags)
 				if (!dquots[cnt])
 					continue;
 				spin_lock(&dquots[cnt]->dq_dqb_lock);
-				if (reserve) {
-					dquots[cnt]->dq_dqb.dqb_rsvspace -=
-									number;
-				} else {
-					dquots[cnt]->dq_dqb.dqb_curspace -=
-									number;
-				}
+				if (reserve)
+					dquot_free_reserved_space(dquots[cnt],
+								  number);
+				else
+					dquot_decr_space(dquots[cnt], number);
 				spin_unlock(&dquots[cnt]->dq_dqb_lock);
 			}
 			spin_unlock(&inode->i_lock);
@@ -1738,7 +1736,7 @@ int dquot_alloc_inode(struct inode *inode)
 					continue;
 				/* Back out changes we already did */
 				spin_lock(&dquots[cnt]->dq_dqb_lock);
-				dquots[cnt]->dq_dqb.dqb_curinodes--;
+				dquot_decr_inodes(dquots[cnt], 1);
 				spin_unlock(&dquots[cnt]->dq_dqb_lock);
 			}
 			goto warn_put_all;