From: Alexey Kuznetsov <kuznet@parallels.com>
Date: Tue, 19 Jul 2016 19:48:01 +0000 (-0700)
Subject: fuse: fsync() did not return IO errors
X-Git-Tag: firefly_0821_release~176^2~4^2~34^2~15
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=3d1c64d81fd887ec0cac56f0299c2234a5450011;p=firefly-linux-kernel-4.4.55.git

fuse: fsync() did not return IO errors

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@virtuozzo.com>
Signed-off-by: Maxim Patlasov <mpatlasov@virtuozzo.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Fixes: 4d99ff8f12eb ("fuse: Turn writeback cache on")
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index c2e340d6ec6e..82f714229b1f 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -462,6 +462,21 @@ int fuse_fsync_common(struct file *file, loff_t start, loff_t end,
 		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;