2 * Transport specific attributes.
4 * Copyright (c) 2003 Silicon Graphics, Inc. All rights reserved.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 #ifndef SCSI_TRANSPORT_H
21 #define SCSI_TRANSPORT_H
23 #include <linux/transport_class.h>
24 #include <scsi/scsi_host.h>
26 struct scsi_transport_template
{
27 /* the attribute containers */
28 struct transport_container host_attrs
;
29 struct transport_container target_attrs
;
30 struct transport_container device_attrs
;
33 * If set, called from sysfs and legacy procfs rescanning code.
35 int (*user_scan
)(struct Scsi_Host
*, uint
, uint
, uint
);
37 /* The size of the specific transport attribute structure (a
38 * space of this size will be left at the end of the
41 int device_private_offset
;
43 int target_private_offset
;
45 /* no private offset for the host; there's an alternative mechanism */
48 * True if the transport wants to use a host-based work-queue
50 unsigned int create_work_queue
: 1;
53 #define transport_class_to_shost(tc) \
54 dev_to_shost((tc)->dev)
57 /* Private area maintenance. The driver requested allocations come
58 * directly after the transport class allocations (if any). The idea
59 * is that you *must* call these only once. The code assumes that the
60 * initial values are the ones the transport specific code requires */
62 scsi_transport_reserve_target(struct scsi_transport_template
* t
, int space
)
64 BUG_ON(t
->target_private_offset
!= 0);
65 t
->target_private_offset
= ALIGN(t
->target_size
, sizeof(void *));
66 t
->target_size
= t
->target_private_offset
+ space
;
69 scsi_transport_reserve_device(struct scsi_transport_template
* t
, int space
)
71 BUG_ON(t
->device_private_offset
!= 0);
72 t
->device_private_offset
= ALIGN(t
->device_size
, sizeof(void *));
73 t
->device_size
= t
->device_private_offset
+ space
;
76 scsi_transport_target_data(struct scsi_target
*starget
)
78 struct Scsi_Host
*shost
= dev_to_shost(&starget
->dev
);
79 return (u8
*)starget
->starget_data
80 + shost
->transportt
->target_private_offset
;
84 scsi_transport_device_data(struct scsi_device
*sdev
)
86 struct Scsi_Host
*shost
= sdev
->host
;
87 return (u8
*)sdev
->sdev_data
88 + shost
->transportt
->device_private_offset
;
91 #endif /* SCSI_TRANSPORT_H */