[PATCH 10/14] xfs: make xfs_trans_get_buf_map return an error code

["Darrick J. Wong" <darrick.wong@xxxxxxxxxx>]

From: Darrick J. Wong <darrick.wong@xxxxxxxxxx>

Source kernel commit: 9676b54e6e28689af1b4247569f14466bdfc5390

Convert xfs_trans_get_buf_map() to return numeric error codes like most
everywhere else in xfs.

Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
Reviewed-by: Dave Chinner <dchinner@xxxxxxxxxx>
Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
---
 include/xfs_trans.h   |   15 ++++++++++-----
 libxfs/trans.c        |   22 +++++++++++-----------
 libxfs/xfs_da_btree.c |    8 ++------
 3 files changed, 23 insertions(+), 22 deletions(-)


diff --git a/include/xfs_trans.h b/include/xfs_trans.h
index cff27546..33ab5d73 100644
--- a/include/xfs_trans.h
+++ b/include/xfs_trans.h
@@ -105,10 +105,9 @@ void	libxfs_trans_log_buf(struct xfs_trans *, struct xfs_buf *,
 				uint, uint);
 bool	libxfs_trans_ordered_buf(xfs_trans_t *, struct xfs_buf *);
 
-struct xfs_buf	*libxfs_trans_get_buf_map(struct xfs_trans *tp,
-					struct xfs_buftarg *btp,
-					struct xfs_buf_map *map, int nmaps,
-					xfs_buf_flags_t flags);
+int	libxfs_trans_get_buf_map(struct xfs_trans *tp, struct xfs_buftarg *btp,
+		struct xfs_buf_map *map, int nmaps, xfs_buf_flags_t flags,
+		struct xfs_buf **bpp);
 
 int	libxfs_trans_read_buf_map(struct xfs_mount *mp, struct xfs_trans *tp,
 				  struct xfs_buftarg *btp,
@@ -123,8 +122,14 @@ libxfs_trans_get_buf(
 	int			numblks,
 	uint			flags)
 {
+	struct xfs_buf		*bp;
+	int			error;
 	DEFINE_SINGLE_BUF_MAP(map, blkno, numblks);
-	return libxfs_trans_get_buf_map(tp, btp, &map, 1, flags);
+
+	error = libxfs_trans_get_buf_map(tp, btp, &map, 1, flags, &bp);
+	if (error)
+		return NULL;
+	return bp;
 }
 
 static inline int
diff --git a/libxfs/trans.c b/libxfs/trans.c
index 73f69bce..ddd07cff 100644
--- a/libxfs/trans.c
+++ b/libxfs/trans.c
@@ -415,24 +415,22 @@ libxfs_trans_bhold_release(
  * If the transaction pointer is NULL, make this just a normal
  * get_buf() call.
  */
-struct xfs_buf *
+int
 libxfs_trans_get_buf_map(
 	struct xfs_trans	*tp,
 	struct xfs_buftarg	*target,
 	struct xfs_buf_map	*map,
 	int			nmaps,
-	xfs_buf_flags_t		flags)
+	xfs_buf_flags_t		flags,
+	struct xfs_buf		**bpp)
 {
 	struct xfs_buf		*bp;
 	struct xfs_buf_log_item	*bip;
 	int			error;
 
-	if (!tp) {
-		error = libxfs_buf_get_map(target, map, nmaps, 0, &bp);
-		if (error)
-			return NULL;
-		return bp;
-	}
+	*bpp = NULL;
+	if (!tp)
+		return libxfs_buf_get_map(target, map, nmaps, 0, bpp);
 
 	/*
 	 * If we find the buffer in the cache with this transaction
@@ -447,18 +445,20 @@ libxfs_trans_get_buf_map(
 		ASSERT(bip != NULL);
 		bip->bli_recur++;
 		trace_xfs_trans_get_buf_recur(bip);
-		return bp;
+		*bpp = bp;
+		return 0;
 	}
 
 	error = libxfs_buf_get_map(target, map, nmaps, 0, &bp);
 	if (error)
-		return NULL;
+		return error;
 
 	ASSERT(!bp->b_error);
 
 	_libxfs_trans_bjoin(tp, bp, 1);
 	trace_xfs_trans_get_buf(bp->b_log_item);
-	return bp;
+	*bpp = bp;
+	return 0;
 }
 
 xfs_buf_t *
diff --git a/libxfs/xfs_da_btree.c b/libxfs/xfs_da_btree.c
index 5102c6e0..3f40e99e 100644
--- a/libxfs/xfs_da_btree.c
+++ b/libxfs/xfs_da_btree.c
@@ -2588,13 +2588,9 @@ xfs_da_get_buf(
 	if (error || nmap == 0)
 		goto out_free;
 
-	bp = xfs_trans_get_buf_map(tp, mp->m_ddev_targp, mapp, nmap, 0);
-	error = bp ? bp->b_error : -EIO;
-	if (error) {
-		if (bp)
-			xfs_trans_brelse(tp, bp);
+	error = xfs_trans_get_buf_map(tp, mp->m_ddev_targp, mapp, nmap, 0, &bp);
+	if (error)
 		goto out_free;
-	}
 
 	*bpp = bp;