Initial import

1 files changed, 122 insertions, 0 deletions

diff --git a/include/scsi/scsi_transport.h b/include/scsi/scsi_transport.h
new file mode 100644
index 000000000..81292392a
--- /dev/null
+++ b/include/scsi/scsi_transport.h
@@ -0,0 +1,122 @@
+/* 
+ *  Transport specific attributes.
+ *
+ *  Copyright (c) 2003 Silicon Graphics, Inc.  All rights reserved.
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+#ifndef SCSI_TRANSPORT_H
+#define SCSI_TRANSPORT_H
+
+#include <linux/transport_class.h>
+#include <linux/blkdev.h>
+#include <linux/bug.h>
+#include <scsi/scsi_host.h>
+#include <scsi/scsi_device.h>
+
+struct scsi_transport_template {
+	/* the attribute containers */
+	struct transport_container host_attrs;
+	struct transport_container target_attrs;
+	struct transport_container device_attrs;
+
+	/*
+	 * If set, called from sysfs and legacy procfs rescanning code.
+	 */
+	int (*user_scan)(struct Scsi_Host *, uint, uint, u64);
+
+	/* The size of the specific transport attribute structure (a
+	 * space of this size will be left at the end of the
+	 * scsi_* structure */
+	int	device_size;
+	int	device_private_offset;
+	int	target_size;
+	int	target_private_offset;
+	int	host_size;
+	/* no private offset for the host; there's an alternative mechanism */
+
+	/*
+	 * True if the transport wants to use a host-based work-queue
+	 */
+	unsigned int create_work_queue : 1;
+
+	/*
+	 * Allows a transport to override the default error handler.
+	 */
+	void (* eh_strategy_handler)(struct Scsi_Host *);
+
+	/*
+	 * This is an optional routine that allows the transport to become
+	 * involved when a scsi io timer fires. The return value tells the
+	 * timer routine how to finish the io timeout handling:
+	 * EH_HANDLED:		I fixed the error, please complete the command
+	 * EH_RESET_TIMER:	I need more time, reset the timer and
+	 *			begin counting again
+	 * EH_NOT_HANDLED	Begin normal error recovery
+	 */
+	enum blk_eh_timer_return (*eh_timed_out)(struct scsi_cmnd *);
+
+	/*
+	 * Used as callback for the completion of i_t_nexus request
+	 * for target drivers.
+	 */
+	int (* it_nexus_response)(struct Scsi_Host *, u64, int);
+
+	/*
+	 * Used as callback for the completion of task management
+	 * request for target drivers.
+	 */
+	int (* tsk_mgmt_response)(struct Scsi_Host *, u64, u64, int);
+};
+
+#define transport_class_to_shost(tc) \
+	dev_to_shost((tc)->parent)
+
+
+/* Private area maintenance. The driver requested allocations come
+ * directly after the transport class allocations (if any).  The idea
+ * is that you *must* call these only once.  The code assumes that the
+ * initial values are the ones the transport specific code requires */
+static inline void
+scsi_transport_reserve_target(struct scsi_transport_template * t, int space)
+{
+	BUG_ON(t->target_private_offset != 0);
+	t->target_private_offset = ALIGN(t->target_size, sizeof(void *));
+	t->target_size = t->target_private_offset + space;
+}
+static inline void
+scsi_transport_reserve_device(struct scsi_transport_template * t, int space)
+{
+	BUG_ON(t->device_private_offset != 0);
+	t->device_private_offset = ALIGN(t->device_size, sizeof(void *));
+	t->device_size = t->device_private_offset + space;
+}
+static inline void *
+scsi_transport_target_data(struct scsi_target *starget)
+{
+	struct Scsi_Host *shost = dev_to_shost(&starget->dev);
+	return (u8 *)starget->starget_data
+		+ shost->transportt->target_private_offset;
+
+}
+static inline void *
+scsi_transport_device_data(struct scsi_device *sdev)
+{
+	struct Scsi_Host *shost = sdev->host;
+	return (u8 *)sdev->sdev_data
+		+ shost->transportt->device_private_offset;
+}
+
+#endif /* SCSI_TRANSPORT_H */