[PATCH 3/9] xfs: make xfs_buf_get return an error code

From: "Darrick J. Wong" <darrick.wong@oracle.com>
To: darrick.wong@oracle.com
Cc: linux-xfs@vger.kernel.org, hch@infradead.org
Subject: [PATCH 3/9] xfs: make xfs_buf_get return an error code
Date: Wed, 15 Jan 2020 09:03:58 -0800	[thread overview]
Message-ID: <157910783855.2028217.9100808565121356587.stgit@magnolia> (raw)
In-Reply-To: <157910781961.2028217.1250106765923436515.stgit@magnolia>

From: Darrick J. Wong <darrick.wong@oracle.com>

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

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
---
 fs/xfs/libxfs/xfs_attr_remote.c |    6 +++---
 fs/xfs/libxfs/xfs_sb.c          |    9 +++++----
 fs/xfs/xfs_buf.c                |   18 ++++++++++++++++++
 fs/xfs/xfs_buf.h                |   11 ++---------
 4 files changed, 28 insertions(+), 16 deletions(-)

diff --git a/fs/xfs/libxfs/xfs_attr_remote.c b/fs/xfs/libxfs/xfs_attr_remote.c
index 46c516809086..8b7f74b3bea2 100644
--- a/fs/xfs/libxfs/xfs_attr_remote.c
+++ b/fs/xfs/libxfs/xfs_attr_remote.c
@@ -545,9 +545,9 @@ xfs_attr_rmtval_set(
 		dblkno = XFS_FSB_TO_DADDR(mp, map.br_startblock),
 		dblkcnt = XFS_FSB_TO_BB(mp, map.br_blockcount);
 
-		bp = xfs_buf_get(mp->m_ddev_targp, dblkno, dblkcnt);
-		if (!bp)
-			return -ENOMEM;
+		error = xfs_buf_get(mp->m_ddev_targp, dblkno, dblkcnt, &bp);
+		if (error)
+			return error;
 		bp->b_ops = &xfs_attr3_rmt_buf_ops;
 
 		xfs_attr_rmtval_copyin(mp, bp, args->dp->i_ino, &offset,
diff --git a/fs/xfs/libxfs/xfs_sb.c b/fs/xfs/libxfs/xfs_sb.c
index 0ac69751fe85..28763c283851 100644
--- a/fs/xfs/libxfs/xfs_sb.c
+++ b/fs/xfs/libxfs/xfs_sb.c
@@ -985,9 +985,10 @@ xfs_update_secondary_sbs(
 	for (agno = 1; agno < mp->m_sb.sb_agcount; agno++) {
 		struct xfs_buf		*bp;
 
-		bp = xfs_buf_get(mp->m_ddev_targp,
+		error = xfs_buf_get(mp->m_ddev_targp,
 				 XFS_AG_DADDR(mp, agno, XFS_SB_DADDR),
-				 XFS_FSS_TO_BB(mp, 1));
+				 XFS_FSS_TO_BB(mp, 1),
+				 &bp);
 		/*
 		 * If we get an error reading or writing alternate superblocks,
 		 * continue.  xfs_repair chooses the "best" superblock based
@@ -995,12 +996,12 @@ xfs_update_secondary_sbs(
 		 * superblocks un-updated than updated, and xfs_repair may
 		 * pick them over the properly-updated primary.
 		 */
-		if (!bp) {
+		if (error) {
 			xfs_warn(mp,
 		"error allocating secondary superblock for ag %d",
 				agno);
 			if (!saved_error)
-				saved_error = -ENOMEM;
+				saved_error = error;
 			continue;
 		}
 
diff --git a/fs/xfs/xfs_buf.c b/fs/xfs/xfs_buf.c
index e11fc43c52de..643173cc58f6 100644
--- a/fs/xfs/xfs_buf.c
+++ b/fs/xfs/xfs_buf.c
@@ -759,6 +759,24 @@ xfs_buf_get_map(
 	return bp;
 }
 
+int
+xfs_buf_get(
+	struct xfs_buftarg	*target,
+	xfs_daddr_t		blkno,
+	size_t			numblks,
+	struct xfs_buf		**bpp)
+{
+	struct xfs_buf		*bp;
+
+	DEFINE_SINGLE_BUF_MAP(map, blkno, numblks);
+	bp = xfs_buf_get_map(target, &map, 1, 0);
+	if (!bp)
+		return -ENOMEM;
+
+	*bpp = bp;
+	return 0;
+}
+
 STATIC int
 _xfs_buf_read(
 	xfs_buf_t		*bp,
diff --git a/fs/xfs/xfs_buf.h b/fs/xfs/xfs_buf.h
index f04722554f63..267b35daf662 100644
--- a/fs/xfs/xfs_buf.h
+++ b/fs/xfs/xfs_buf.h
@@ -203,15 +203,8 @@ void xfs_buf_readahead_map(struct xfs_buftarg *target,
 			       struct xfs_buf_map *map, int nmaps,
 			       const struct xfs_buf_ops *ops);
 
-static inline struct xfs_buf *
-xfs_buf_get(
-	struct xfs_buftarg	*target,
-	xfs_daddr_t		blkno,
-	size_t			numblks)
-{
-	DEFINE_SINGLE_BUF_MAP(map, blkno, numblks);
-	return xfs_buf_get_map(target, &map, 1, 0);
-}
+int xfs_buf_get(struct xfs_buftarg *target, xfs_daddr_t blkno, size_t numblks,
+		struct xfs_buf **bpp);
 
 int xfs_buf_read(struct xfs_buftarg *target, xfs_daddr_t blkno, size_t numblks,
 		xfs_buf_flags_t flags, struct xfs_buf **bpp,

