[PATCH] fsnotify: Do not show file handles for unsupported filesystems

[Jan Kara]

Filesystems not setting their s_export_op do not support file handles.
Do no try to encode them using exportfs_encode_inode_fh() since that may
fail or return garbage.

Reported-by: NeilBrown <neilb@xxxxxxxx>
Signed-off-by: Jan Kara <jack@xxxxxxx>
---
 fs/notify/fdinfo.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/fs/notify/fdinfo.c b/fs/notify/fdinfo.c
index d478629c728b..041c2b0cc145 100644
--- a/fs/notify/fdinfo.c
+++ b/fs/notify/fdinfo.c
@@ -46,6 +46,9 @@ static void show_mark_fhandle(struct seq_file *m, struct inode *inode)
 	} f;
 	int size, ret, i;
 
+	if (!inode->i_sb->s_export_op)
+		return;
+
 	f.handle.handle_bytes = sizeof(f.pad);
 	size = f.handle.handle_bytes >> 2;
 
-- 
2.12.3


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