linux-kernel - [PATCH 3.16 124/346] fuse: fsync() did not return IO errors

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Message-ID: <lsq.1479082460.63986437@decadent.org.uk>
Date:   Mon, 14 Nov 2016 00:14:20 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org,
        "Alexey Kuznetsov" <kuznet@...allels.com>,
        "Maxim Patlasov" <mpatlasov@...tuozzo.com>,
        "Alexey Kuznetsov" <kuznet@...tuozzo.com>,
        "Miklos Szeredi" <mszeredi@...hat.com>
Subject: [PATCH 3.16 124/346] fuse: fsync() did not return IO errors

3.16.39-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Alexey Kuznetsov <kuznet@...allels.com>

commit ac7f052b9e1534c8248f814b6f0068ad8d4a06d2 upstream.

Due to implementation of fuse writeback filemap_write_and_wait_range() does
not catch errors. We have to do this directly after fuse_sync_writes()

Signed-off-by: Alexey Kuznetsov <kuznet@...tuozzo.com>
Signed-off-by: Maxim Patlasov <mpatlasov@...tuozzo.com>
Signed-off-by: Miklos Szeredi <mszeredi@...hat.com>
Fixes: 4d99ff8f12eb ("fuse: Turn writeback cache on")
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 fs/fuse/file.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -499,6 +499,21 @@ int fuse_fsync_common(struct file *file,
 		goto out;
 
 	fuse_sync_writes(inode);
+
+	/*
+	 * Due to implementation of fuse writeback
+	 * filemap_write_and_wait_range() does not catch errors.
+	 * We have to do this directly after fuse_sync_writes()
+	 */
+	if (test_bit(AS_ENOSPC, &file->f_mapping->flags) &&
+	    test_and_clear_bit(AS_ENOSPC, &file->f_mapping->flags))
+		err = -ENOSPC;
+	if (test_bit(AS_EIO, &file->f_mapping->flags) &&
+	    test_and_clear_bit(AS_EIO, &file->f_mapping->flags))
+		err = -EIO;
+	if (err)
+		goto out;
+
 	err = sync_inode_metadata(inode, 1);
 	if (err)
 		goto out;