From: Niu Yawei <yawei.niu@gmail.com>
Date: Wed, 4 Jun 2014 04:21:30 +0000 (+0800)
Subject: quota: simplify remove_inode_dquot_ref()
X-Git-Tag: v3.17-rc1~41^2~8
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=9eb6463f31cf720deaf0e810cacc403d7720b10c;p=karo-tx-linux.git

quota: simplify remove_inode_dquot_ref()

Simplify the remove_inode_dquot_ref() to make it more obvious
that now we keep one reference for each dquot from inodes.

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Niu Yawei <yawei.niu@intel.com>
Signed-off-by: Jan Kara <jack@suse.cz>
---

diff --git a/fs/quota/dquot.c b/fs/quota/dquot.c
index 251771916069..fb2d2e2a89e7 100644
--- a/fs/quota/dquot.c
+++ b/fs/quota/dquot.c
@@ -733,7 +733,6 @@ static struct shrinker dqcache_shrinker = {
 
 /*
  * Put reference to dquot
- * NOTE: If you change this function please check whether dqput_blocks() works right...
  */
 void dqput(struct dquot *dquot)
 {
@@ -962,47 +961,35 @@ static void add_dquot_ref(struct super_block *sb, int type)
 #endif
 }
 
-/*
- * Return 0 if dqput() won't block.
- * (note that 1 doesn't necessarily mean blocking)
- */
-static inline int dqput_blocks(struct dquot *dquot)
-{
-	if (atomic_read(&dquot->dq_count) <= 1)
-		return 1;
-	return 0;
-}
-
 /*
  * Remove references to dquots from inode and add dquot to list for freeing
  * if we have the last reference to dquot
  * We can't race with anybody because we hold dqptr_sem for writing...
  */
-static int remove_inode_dquot_ref(struct inode *inode, int type,
-				  struct list_head *tofree_head)
+static void remove_inode_dquot_ref(struct inode *inode, int type,
+				   struct list_head *tofree_head)
 {
 	struct dquot *dquot = inode->i_dquot[type];
 
 	inode->i_dquot[type] = NULL;
-	if (dquot) {
-		if (dqput_blocks(dquot)) {
-#ifdef CONFIG_QUOTA_DEBUG
-			if (atomic_read(&dquot->dq_count) != 1)
-				quota_error(inode->i_sb, "Adding dquot with "
-					    "dq_count %d to dispose list",
-					    atomic_read(&dquot->dq_count));
-#endif
-			spin_lock(&dq_list_lock);
-			/* As dquot must have currently users it can't be on
-			 * the free list... */
-			list_add(&dquot->dq_free, tofree_head);
-			spin_unlock(&dq_list_lock);
-			return 1;
-		}
-		else
-			dqput(dquot);   /* We have guaranteed we won't block */
+	if (!dquot)
+		return;
+
+	if (list_empty(&dquot->dq_free)) {
+		/*
+		 * The inode still has reference to dquot so it can't be in the
+		 * free list
+		 */
+		spin_lock(&dq_list_lock);
+		list_add(&dquot->dq_free, tofree_head);
+		spin_unlock(&dq_list_lock);
+	} else {
+		/*
+		 * Dquot is already in a list to put so we won't drop the last
+		 * reference here.
+		 */
+		dqput(dquot);
 	}
-	return 0;
 }
 
 /*