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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 | |
28 | enum { |
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) |
59 | extern int scsi_dh_activate(struct request_queue *, activate_complete, void *); |
60 | extern int scsi_dh_handler_exist(const char *); |
61 | extern int scsi_dh_attach(struct request_queue *, const char *); |
62 | extern void scsi_dh_detach(struct request_queue *); |
63 | extern int scsi_dh_set_params(struct request_queue *, const char *); |
64 | #else |
65 | static inline int scsi_dh_activate(struct request_queue *req, |
66 | activate_complete fn, void *data) |
67 | { |
68 | fn(data, 0); |
69 | return 0; |
70 | } |
71 | static inline int scsi_dh_handler_exist(const char *name) |
72 | { |
73 | return 0; |
74 | } |
75 | static inline int scsi_dh_attach(struct request_queue *req, const char *name) |
76 | { |
77 | return SCSI_DH_NOSYS; |
78 | } |
79 | static inline void scsi_dh_detach(struct request_queue *q) |
80 | { |
81 | return; |
82 | } |
83 | static 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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