+/*
+ * The only flag combination which matches the behavior of zfs_space()
+ * is FALLOC_FL_PUNCH_HOLE. This flag was introduced in the 2.6.38 kernel.
+ */
+long
+zpl_fallocate_common(struct inode *ip, int mode, loff_t offset, loff_t len)
+{
+ cred_t *cr = CRED();
+ int error = -EOPNOTSUPP;
+
+ if (mode & FALLOC_FL_KEEP_SIZE)
+ return (-EOPNOTSUPP);
+
+ crhold(cr);
+
+#ifdef FALLOC_FL_PUNCH_HOLE
+ if (mode & FALLOC_FL_PUNCH_HOLE) {
+ flock64_t bf;
+
+ bf.l_type = F_WRLCK;
+ bf.l_whence = 0;
+ bf.l_start = offset;
+ bf.l_len = len;
+ bf.l_pid = 0;
+
+ error = -zfs_space(ip, F_FREESP, &bf, FWRITE, offset, cr);
+ }
+#endif /* FALLOC_FL_PUNCH_HOLE */
+
+ crfree(cr);
+
+ ASSERT3S(error, <=, 0);
+ return (error);
+}
+
+#ifdef HAVE_FILE_FALLOCATE
+static long
+zpl_fallocate(struct file *filp, int mode, loff_t offset, loff_t len)
+{
+ return zpl_fallocate_common(filp->f_path.dentry->d_inode,
+ mode, offset, len);
+}
+#endif /* HAVE_FILE_FALLOCATE */
+