[PATCH 1/2] xfs: make xfs_buf_incore out of line

[Dave Chinner <david@fromorbit.com>]

From: Dave Chinner <dchinner@redhat.com>

Move xfs_buf_incore out of line and make it the only way to look up
a buffer in the buffer cache from outside the buffer cache. Convert
the external users of _xfs_buf_find() to xfs_buf_incore() and make
_xfs_buf_find() static.

Signed-Off-By: Dave Chinner <dchinner@redhat.com>
---
 fs/xfs/xfs_buf.c | 21 ++++++++++++++++-----
 fs/xfs/xfs_buf.h | 17 +++--------------
 fs/xfs/xfs_qm.c  |  5 ++---
 3 files changed, 21 insertions(+), 22 deletions(-)

diff --git a/fs/xfs/xfs_buf.c b/fs/xfs/xfs_buf.c
index 55661cbdb51b..2ca8e2c7fbc4 100644
--- a/fs/xfs/xfs_buf.c
+++ b/fs/xfs/xfs_buf.c
@@ -549,17 +549,17 @@ xfs_buf_hash_destroy(
 }
 
 /*
- *	Look up, and creates if absent, a lockable buffer for
- *	a given range of an inode.  The buffer is returned
- *	locked.	No I/O is implied by this call.
+ * Look up (and insert if absent), a lockable buffer for a given
+ * range of an inode.  The buffer is returned locked. No I/O is
+ * implied by this call.
  */
-xfs_buf_t *
+static struct xfs_buf *
 _xfs_buf_find(
 	struct xfs_buftarg	*btp,
 	struct xfs_buf_map	*map,
 	int			nmaps,
 	xfs_buf_flags_t		flags,
-	xfs_buf_t		*new_bp)
+	struct xfs_buf		*new_bp)
 {
 	struct xfs_perag	*pag;
 	xfs_buf_t		*bp;
@@ -649,6 +649,17 @@ _xfs_buf_find(
 	return bp;
 }
 
+struct xfs_buf *
+xfs_incore(
+	struct xfs_buftarg	*target,
+	xfs_daddr_t		blkno,
+	size_t			numblks,
+	xfs_buf_flags_t		flags)
+{
+	DEFINE_SINGLE_BUF_MAP(map, blkno, numblks);
+	return _xfs_buf_find(target, &map, 1, flags, NULL);
+}
+
 /*
  * Assembles a buffer covering the specified range. The code is optimised for
  * cache hits, as metadata intensive workloads will see 3 orders of magnitude
diff --git a/fs/xfs/xfs_buf.h b/fs/xfs/xfs_buf.h
index edced162a674..e8947c1adac0 100644
--- a/fs/xfs/xfs_buf.h
+++ b/fs/xfs/xfs_buf.h
@@ -218,20 +218,9 @@ typedef struct xfs_buf {
 } xfs_buf_t;
 
 /* Finding and Reading Buffers */
-struct xfs_buf *_xfs_buf_find(struct xfs_buftarg *target,
-			      struct xfs_buf_map *map, int nmaps,
-			      xfs_buf_flags_t flags, struct xfs_buf *new_bp);
-
-static inline struct xfs_buf *
-xfs_incore(
-	struct xfs_buftarg	*target,
-	xfs_daddr_t		blkno,
-	size_t			numblks,
-	xfs_buf_flags_t		flags)
-{
-	DEFINE_SINGLE_BUF_MAP(map, blkno, numblks);
-	return _xfs_buf_find(target, &map, 1, flags, NULL);
-}
+struct xfs_buf *xfs_incore(struct xfs_buftarg *target,
+			   xfs_daddr_t blkno, size_t numblks,
+			   xfs_buf_flags_t flags);
 
 struct xfs_buf *_xfs_buf_alloc(struct xfs_buftarg *target,
 			       struct xfs_buf_map *map, int nmaps,
diff --git a/fs/xfs/xfs_qm.c b/fs/xfs/xfs_qm.c
index ec39ae274c78..aff4924f637f 100644
--- a/fs/xfs/xfs_qm.c
+++ b/fs/xfs/xfs_qm.c
@@ -1247,9 +1247,8 @@ xfs_qm_flush_one(
 	 */
 	if (!xfs_dqflock_nowait(dqp)) {
 		/* buf is pinned in-core by delwri list */
-		DEFINE_SINGLE_BUF_MAP(map, dqp->q_blkno,
-				      mp->m_quotainfo->qi_dqchunklen);
-		bp = _xfs_buf_find(mp->m_ddev_targp, &map, 1, 0, NULL);
+		bp = xfs_incore(mp->m_ddev_targp, dqp->q_blkno,
+				mp->m_quotainfo->qi_dqchunklen, 0);
 		if (!bp) {
 			error = -EINVAL;
 			goto out_unlock;
-- 
2.16.1