[RFC PATCH 2/4] Define a new function xfs_inode_dquot()

[Chandra Seetharaman <sekharan@xxxxxxxxxx>]

Define a new function xfs_inode_dquot() that takes a inode pointer
and a disk quota type and returns the quota pointer for the specified
quota type.

This simplifies the xfs_qm_dqget() error path significantly.

Signed-off-by: Chandra Seetharaman <sekharan@xxxxxxxxxx>
---
 fs/xfs/xfs_dquot.c |   33 +++++++++------------------------
 fs/xfs/xfs_dquot.h |   14 ++++++++++++++
 2 files changed, 23 insertions(+), 24 deletions(-)

diff --git a/fs/xfs/xfs_dquot.h b/fs/xfs/xfs_dquot.h
index 221b22e..41cb5f4 100644
--- a/fs/xfs/xfs_dquot.h
+++ b/fs/xfs/xfs_dquot.h
@@ -129,6 +129,20 @@ static inline int xfs_this_quota_on(struct xfs_mount *mp, int type)
 	}
 }
 
+static inline xfs_dquot_t *xfs_inode_dquot(struct xfs_inode *ip, int type)
+{
+	type &= XFS_DQ_ALLTYPES;
+	switch(type) {
+	case XFS_DQ_USER:
+		return ip->i_udquot;
+	case XFS_DQ_PROJ:
+	case XFS_DQ_GROUP:
+		return ip->i_gdquot;
+	default:
+		return NULL;
+	}
+}
+
 #define XFS_DQ_IS_LOCKED(dqp)	(mutex_is_locked(&((dqp)->q_qlock)))
 #define XFS_DQ_IS_DIRTY(dqp)	((dqp)->dq_flags & XFS_DQ_DIRTY)
 #define XFS_QM_ISUDQ(dqp)	((dqp)->dq_flags & XFS_DQ_USER)
diff --git a/fs/xfs/xfs_dquot.c b/fs/xfs/xfs_dquot.c
index 4c8b3d2..bf4fe86 100644
--- a/fs/xfs/xfs_dquot.c
+++ b/fs/xfs/xfs_dquot.c
@@ -723,7 +723,7 @@ xfs_qm_dqget(
 	uint		flags,	  /* DQALLOC, DQSUSER, DQREPAIR, DOWARN */
 	xfs_dquot_t	**O_dqpp) /* OUT : locked incore dquot */
 {
-	xfs_dquot_t	*dqp;
+	xfs_dquot_t	*dqp, *dqp1;
 	xfs_dqhash_t	*h;
 	uint		version;
 	int		error;
@@ -750,10 +750,7 @@ xfs_qm_dqget(
 	       type == XFS_DQ_GROUP);
 	if (ip) {
 		ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
-		if (type == XFS_DQ_USER)
-			ASSERT(ip->i_udquot == NULL);
-		else
-			ASSERT(ip->i_gdquot == NULL);
+		ASSERT(xfs_inode_dquot(ip, type) == NULL);
 	}
 #endif
 
@@ -819,30 +816,18 @@ restart:
 		 * A dquot could be attached to this inode by now, since
 		 * we had dropped the ilock.
 		 */
-		if (type == XFS_DQ_USER) {
-			if (!XFS_IS_UQUOTA_ON(mp)) {
-				/* inode stays locked on return */
-				xfs_qm_dqdestroy(dqp);
-				return XFS_ERROR(ESRCH);
-			}
-			if (ip->i_udquot) {
+		if (xfs_this_quota_on(mp, type)) {
+			dqp1 = xfs_inode_dquot(ip, type);
+			if (dqp1) {
 				xfs_qm_dqdestroy(dqp);
-				dqp = ip->i_udquot;
+				dqp = dqp1;
 				xfs_dqlock(dqp);
 				goto dqret;
 			}
 		} else {
-			if (!XFS_IS_OQUOTA_ON(mp)) {
-				/* inode stays locked on return */
-				xfs_qm_dqdestroy(dqp);
-				return XFS_ERROR(ESRCH);
-			}
-			if (ip->i_gdquot) {
-				xfs_qm_dqdestroy(dqp);
-				dqp = ip->i_gdquot;
-				xfs_dqlock(dqp);
-				goto dqret;
-			}
+			/* inode stays locked on return */
+			xfs_qm_dqdestroy(dqp);
+			return XFS_ERROR(ESRCH);
 		}
 	}
 
-- 
1.7.1

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