fs: use kmem_cache_zalloc instead
[pv_ops_mirror.git] / include / scsi / scsi_transport.h
blob0dfef752f0e27c7c9009a2dbe378522322d453a4
1 /*
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>
25 #include <scsi/scsi_device.h>
27 struct scsi_transport_template {
28 /* the attribute containers */
29 struct transport_container host_attrs;
30 struct transport_container target_attrs;
31 struct transport_container device_attrs;
34 * If set, called from sysfs and legacy procfs rescanning code.
36 int (*user_scan)(struct Scsi_Host *, uint, uint, uint);
38 /* The size of the specific transport attribute structure (a
39 * space of this size will be left at the end of the
40 * scsi_* structure */
41 int device_size;
42 int device_private_offset;
43 int target_size;
44 int target_private_offset;
45 int host_size;
46 /* no private offset for the host; there's an alternative mechanism */
49 * True if the transport wants to use a host-based work-queue
51 unsigned int create_work_queue : 1;
54 * Allows a transport to override the default error handler.
56 void (* eh_strategy_handler)(struct Scsi_Host *);
59 * This is an optional routine that allows the transport to become
60 * involved when a scsi io timer fires. The return value tells the
61 * timer routine how to finish the io timeout handling:
62 * EH_HANDLED: I fixed the error, please complete the command
63 * EH_RESET_TIMER: I need more time, reset the timer and
64 * begin counting again
65 * EH_NOT_HANDLED Begin normal error recovery
67 enum scsi_eh_timer_return (* eh_timed_out)(struct scsi_cmnd *);
70 * Used as callback for the completion of i_t_nexus request
71 * for target drivers.
73 int (* it_nexus_response)(struct Scsi_Host *, u64, int);
76 * Used as callback for the completion of task management
77 * request for target drivers.
79 int (* tsk_mgmt_response)(struct Scsi_Host *, u64, u64, int);
82 #define transport_class_to_shost(tc) \
83 dev_to_shost((tc)->dev)
86 /* Private area maintenance. The driver requested allocations come
87 * directly after the transport class allocations (if any). The idea
88 * is that you *must* call these only once. The code assumes that the
89 * initial values are the ones the transport specific code requires */
90 static inline void
91 scsi_transport_reserve_target(struct scsi_transport_template * t, int space)
93 BUG_ON(t->target_private_offset != 0);
94 t->target_private_offset = ALIGN(t->target_size, sizeof(void *));
95 t->target_size = t->target_private_offset + space;
97 static inline void
98 scsi_transport_reserve_device(struct scsi_transport_template * t, int space)
100 BUG_ON(t->device_private_offset != 0);
101 t->device_private_offset = ALIGN(t->device_size, sizeof(void *));
102 t->device_size = t->device_private_offset + space;
104 static inline void *
105 scsi_transport_target_data(struct scsi_target *starget)
107 struct Scsi_Host *shost = dev_to_shost(&starget->dev);
108 return (u8 *)starget->starget_data
109 + shost->transportt->target_private_offset;
112 static inline void *
113 scsi_transport_device_data(struct scsi_device *sdev)
115 struct Scsi_Host *shost = sdev->host;
116 return (u8 *)sdev->sdev_data
117 + shost->transportt->device_private_offset;
120 #endif /* SCSI_TRANSPORT_H */