Root/include/scsi/scsi_dh.h

1/*
2 * Header file for SCSI device handler infrastruture.
3 *
4 * Modified version of patches posted by Mike Christie <michaelc@cs.wisc.edu>
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation; either version 2 of the License, or (at your
9 * option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License along
17 * with this program; if not, write to the Free Software Foundation, Inc.,
18 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
19 *
20 * Copyright IBM Corporation, 2007
21 * Authors:
22 * Chandra Seetharaman <sekharan@us.ibm.com>
23 * Mike Anderson <andmike@linux.vnet.ibm.com>
24 */
25
26#include <scsi/scsi_device.h>
27
28enum {
29    SCSI_DH_OK = 0,
30    /*
31     * device errors
32     */
33    SCSI_DH_DEV_FAILED, /* generic device error */
34    SCSI_DH_DEV_TEMP_BUSY,
35    SCSI_DH_DEV_UNSUPP, /* device handler not supported */
36    SCSI_DH_DEVICE_MAX, /* max device blkerr definition */
37
38    /*
39     * transport errors
40     */
41    SCSI_DH_NOTCONN = SCSI_DH_DEVICE_MAX + 1,
42    SCSI_DH_CONN_FAILURE,
43    SCSI_DH_TRANSPORT_MAX, /* max transport blkerr definition */
44
45    /*
46     * driver and generic errors
47     */
48    SCSI_DH_IO = SCSI_DH_TRANSPORT_MAX + 1, /* generic error */
49    SCSI_DH_INVALID_IO,
50    SCSI_DH_RETRY, /* retry the req, but not immediately */
51    SCSI_DH_IMM_RETRY, /* immediately retry the req */
52    SCSI_DH_TIMED_OUT,
53    SCSI_DH_RES_TEMP_UNAVAIL,
54    SCSI_DH_DEV_OFFLINED,
55    SCSI_DH_NOSYS,
56    SCSI_DH_DRIVER_MAX,
57};
58#if defined(CONFIG_SCSI_DH) || defined(CONFIG_SCSI_DH_MODULE)
59extern int scsi_dh_activate(struct request_queue *, activate_complete, void *);
60extern int scsi_dh_handler_exist(const char *);
61extern int scsi_dh_attach(struct request_queue *, const char *);
62extern void scsi_dh_detach(struct request_queue *);
63extern int scsi_dh_set_params(struct request_queue *, const char *);
64#else
65static inline int scsi_dh_activate(struct request_queue *req,
66                    activate_complete fn, void *data)
67{
68    fn(data, 0);
69    return 0;
70}
71static inline int scsi_dh_handler_exist(const char *name)
72{
73    return 0;
74}
75static inline int scsi_dh_attach(struct request_queue *req, const char *name)
76{
77    return SCSI_DH_NOSYS;
78}
79static inline void scsi_dh_detach(struct request_queue *q)
80{
81    return;
82}
83static inline int scsi_dh_set_params(struct request_queue *req, const char *params)
84{
85    return -SCSI_DH_NOSYS;
86}
87#endif
88

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