tree af29d7c8a094b0560c3ed04aebacdea23ae1177f
parent 2456242530a21cfee82646ebeeda65d3f74faa4c
author Chris Mason <chris.mason@oracle.com> 1235145310 -0500
committer Chris Mason <chris.mason@oracle.com> 1235145310 -0500

Btrfs: check file pointer in btrfs_sync_file

fsync can be called by NFS with a null file pointer, and btrfs was
oopsing in this case.

Signed-off-by: Chris Mason <chris.mason@oracle.com>