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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Andreas Gruenbacher <agruenba@redhat.com>,
        Anand Jain <anand.jain@oracle.com>
Subject: [PATCH 5.15 18/33] gfs2: Add wrapper for iomap_file_buffered_write
Date:   Fri, 29 Apr 2022 12:42:05 +0200
Message-Id: <20220429104052.869325697@linuxfoundation.org>
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From: Andreas Gruenbacher <agruenba@redhat.com>

commit 2eb7509a05443048fb4df60b782de3f03c6c298b upstream

Add a wrapper around iomap_file_buffered_write.  We'll add code for when
the operation needs to be retried here later.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 fs/gfs2/file.c |   27 +++++++++++++++++----------
 1 file changed, 17 insertions(+), 10 deletions(-)

--- a/fs/gfs2/file.c
+++ b/fs/gfs2/file.c
@@ -877,6 +877,20 @@ out_uninit:
 	return written ? written : ret;
 }
 
+static ssize_t gfs2_file_buffered_write(struct kiocb *iocb, struct iov_iter *from)
+{
+	struct file *file = iocb->ki_filp;
+	struct inode *inode = file_inode(file);
+	ssize_t ret;
+
+	current->backing_dev_info = inode_to_bdi(inode);
+	ret = iomap_file_buffered_write(iocb, from, &gfs2_iomap_ops);
+	current->backing_dev_info = NULL;
+	if (ret > 0)
+		iocb->ki_pos += ret;
+	return ret;
+}
+
 /**
  * gfs2_file_write_iter - Perform a write to a file
  * @iocb: The io context
@@ -928,9 +942,7 @@ static ssize_t gfs2_file_write_iter(stru
 			goto out_unlock;
 
 		iocb->ki_flags |= IOCB_DSYNC;
-		current->backing_dev_info = inode_to_bdi(inode);
-		buffered = iomap_file_buffered_write(iocb, from, &gfs2_iomap_ops);
-		current->backing_dev_info = NULL;
+		buffered = gfs2_file_buffered_write(iocb, from);
 		if (unlikely(buffered <= 0)) {
 			if (!ret)
 				ret = buffered;
@@ -944,7 +956,6 @@ static ssize_t gfs2_file_write_iter(stru
 		 * the direct I/O range as we don't know if the buffered pages
 		 * made it to disk.
 		 */
-		iocb->ki_pos += buffered;
 		ret2 = generic_write_sync(iocb, buffered);
 		invalidate_mapping_pages(mapping,
 				(iocb->ki_pos - buffered) >> PAGE_SHIFT,
@@ -952,13 +963,9 @@ static ssize_t gfs2_file_write_iter(stru
 		if (!ret || ret2 > 0)
 			ret += ret2;
 	} else {
-		current->backing_dev_info = inode_to_bdi(inode);
-		ret = iomap_file_buffered_write(iocb, from, &gfs2_iomap_ops);
-		current->backing_dev_info = NULL;
-		if (likely(ret > 0)) {
-			iocb->ki_pos += ret;
+		ret = gfs2_file_buffered_write(iocb, from);
+		if (likely(ret > 0))
 			ret = generic_write_sync(iocb, ret);
-		}
 	}
 
 out_unlock: