+STATIC int
+xfs_close(
+ bhv_desc_t *bdp,
+ int flags,
+ lastclose_t lastclose,
+ cred_t *credp)
+{
+ vnode_t *vp = BHV_TO_VNODE(bdp);
+ xfs_inode_t *ip = XFS_BHVTOI(bdp);
+ int error = 0;
+
+ if (XFS_FORCED_SHUTDOWN(ip->i_mount))
+ return XFS_ERROR(EIO);
+
+ if (lastclose != L_TRUE || !VN_ISREG(vp))
+ return 0;
+
+ /*
+ * If we previously truncated this file and removed old data in
+ * the process, we want to initiate "early" writeout on the last
+ * close. This is an attempt to combat the notorious NULL files
+ * problem which is particularly noticable from a truncate down,
+ * buffered (re-)write (delalloc), followed by a crash. What we
+ * are effectively doing here is significantly reducing the time
+ * window where we'd otherwise be exposed to that problem.
+ */
+ if (VUNTRUNCATE(vp) && VN_DIRTY(vp) && ip->i_delayed_blks > 0)
+ VOP_FLUSH_PAGES(vp, 0, -1, XFS_B_ASYNC, FI_NONE, error);
+ return error;
+}