linux-kernel - [PATCH 5.4 184/309] gfs2: move setting current->backing_dev

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Message-Id: <20200210122424.229873269@linuxfoundation.org>
Date:   Mon, 10 Feb 2020 04:32:20 -0800
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Christoph Hellwig <hch@....de>,
        Andreas Gruenbacher <agruenba@...hat.com>
Subject: [PATCH 5.4 184/309] gfs2: move setting current->backing_dev_info

From: Christoph Hellwig <hch@....de>

commit 4c0e8dda608a51855225c611b5c6b442f95fbc56 upstream.

Set current->backing_dev_info just around the buffered write calls to
prepare for the next fix.

Fixes: 967bcc91b044 ("gfs2: iomap direct I/O support")
Cc: stable@...r.kernel.org # v4.19+
Signed-off-by: Christoph Hellwig <hch@....de>
Signed-off-by: Andreas Gruenbacher <agruenba@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/gfs2/file.c |   21 ++++++++++-----------
 1 file changed, 10 insertions(+), 11 deletions(-)

--- a/fs/gfs2/file.c
+++ b/fs/gfs2/file.c
@@ -853,18 +853,15 @@ static ssize_t gfs2_file_write_iter(stru
 	inode_lock(inode);
 	ret = generic_write_checks(iocb, from);
 	if (ret <= 0)
-		goto out;
-
-	/* We can write back this queue in page reclaim */
-	current->backing_dev_info = inode_to_bdi(inode);
+		goto out_unlock;
 
 	ret = file_remove_privs(file);
 	if (ret)
-		goto out2;
+		goto out_unlock;
 
 	ret = file_update_time(file);
 	if (ret)
-		goto out2;
+		goto out_unlock;
 
 	if (iocb->ki_flags & IOCB_DIRECT) {
 		struct address_space *mapping = file->f_mapping;
@@ -873,11 +870,13 @@ static ssize_t gfs2_file_write_iter(stru
 
 		written = gfs2_file_direct_write(iocb, from);
 		if (written < 0 || !iov_iter_count(from))
-			goto out2;
+			goto out_unlock;
 
+		current->backing_dev_info = inode_to_bdi(inode);
 		ret = iomap_file_buffered_write(iocb, from, &gfs2_iomap_ops);
+		current->backing_dev_info = NULL;
 		if (unlikely(ret < 0))
-			goto out2;
+			goto out_unlock;
 		buffered = ret;
 
 		/*
@@ -901,14 +900,14 @@ static ssize_t gfs2_file_write_iter(stru
 			 */
 		}
 	} 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;
 	}
 
-out2:
-	current->backing_dev_info = NULL;
-out:
+out_unlock:
 	inode_unlock(inode);
 	if (likely(ret > 0)) {
 		/* Handle various SYNC-type writes */