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authorChandra Seetharaman <sekharan@us.ibm.com>2008-05-01 17:50:40 -0400
committerJames Bottomley <James.Bottomley@HansenPartnership.com>2008-06-05 10:23:42 -0400
commit688864e29869a71a8183e4e2f96ccf9f2de1375f (patch)
treec77035b81c5eb798ecdad1d971a8a4a66fda8949 /drivers/md
parentcb520223d7f22c5386aff27a5856a66e2c32aaac (diff)
[SCSI] scsi_dh: Remove hardware handler infrastructure from dm
This patch just removes infrastructure that provided support for hardware handlers in the dm layer as it is not needed anymore. Signed-off-by: Chandra Seetharaman <sekharan@us.ibm.com> Acked-by: Alasdair G Kergon <agk@redhat.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Diffstat (limited to 'drivers/md')
-rw-r--r--drivers/md/Makefile2
-rw-r--r--drivers/md/dm-hw-handler.c213
-rw-r--r--drivers/md/dm-hw-handler.h63
-rw-r--r--drivers/md/dm-mpath.h1
4 files changed, 1 insertions, 278 deletions
diff --git a/drivers/md/Makefile b/drivers/md/Makefile
index 62e141e86d6..f1ef33dfd8c 100644
--- a/drivers/md/Makefile
+++ b/drivers/md/Makefile
@@ -4,7 +4,7 @@
4 4
5dm-mod-objs := dm.o dm-table.o dm-target.o dm-linear.o dm-stripe.o \ 5dm-mod-objs := dm.o dm-table.o dm-target.o dm-linear.o dm-stripe.o \
6 dm-ioctl.o dm-io.o dm-kcopyd.o 6 dm-ioctl.o dm-io.o dm-kcopyd.o
7dm-multipath-objs := dm-hw-handler.o dm-path-selector.o dm-mpath.o 7dm-multipath-objs := dm-path-selector.o dm-mpath.o
8dm-snapshot-objs := dm-snap.o dm-exception-store.o 8dm-snapshot-objs := dm-snap.o dm-exception-store.o
9dm-mirror-objs := dm-raid1.o 9dm-mirror-objs := dm-raid1.o
10md-mod-objs := md.o bitmap.o 10md-mod-objs := md.o bitmap.o
diff --git a/drivers/md/dm-hw-handler.c b/drivers/md/dm-hw-handler.c
deleted file mode 100644
index 2ee84d8aa0b..00000000000
--- a/drivers/md/dm-hw-handler.c
+++ /dev/null
@@ -1,213 +0,0 @@
1/*
2 * Copyright (C) 2004 Red Hat, Inc. All rights reserved.
3 *
4 * This file is released under the GPL.
5 *
6 * Multipath hardware handler registration.
7 */
8
9#include "dm.h"
10#include "dm-hw-handler.h"
11
12#include <linux/slab.h>
13
14struct hwh_internal {
15 struct hw_handler_type hwht;
16
17 struct list_head list;
18 long use;
19};
20
21#define hwht_to_hwhi(__hwht) container_of((__hwht), struct hwh_internal, hwht)
22
23static LIST_HEAD(_hw_handlers);
24static DECLARE_RWSEM(_hwh_lock);
25
26static struct hwh_internal *__find_hw_handler_type(const char *name)
27{
28 struct hwh_internal *hwhi;
29
30 list_for_each_entry(hwhi, &_hw_handlers, list) {
31 if (!strcmp(name, hwhi->hwht.name))
32 return hwhi;
33 }
34
35 return NULL;
36}
37
38static struct hwh_internal *get_hw_handler(const char *name)
39{
40 struct hwh_internal *hwhi;
41
42 down_read(&_hwh_lock);
43 hwhi = __find_hw_handler_type(name);
44 if (hwhi) {
45 if ((hwhi->use == 0) && !try_module_get(hwhi->hwht.module))
46 hwhi = NULL;
47 else
48 hwhi->use++;
49 }
50 up_read(&_hwh_lock);
51
52 return hwhi;
53}
54
55struct hw_handler_type *dm_get_hw_handler(const char *name)
56{
57 struct hwh_internal *hwhi;
58
59 if (!name)
60 return NULL;
61
62 hwhi = get_hw_handler(name);
63 if (!hwhi) {
64 request_module("dm-%s", name);
65 hwhi = get_hw_handler(name);
66 }
67
68 return hwhi ? &hwhi->hwht : NULL;
69}
70
71void dm_put_hw_handler(struct hw_handler_type *hwht)
72{
73 struct hwh_internal *hwhi;
74
75 if (!hwht)
76 return;
77
78 down_read(&_hwh_lock);
79 hwhi = __find_hw_handler_type(hwht->name);
80 if (!hwhi)
81 goto out;
82
83 if (--hwhi->use == 0)
84 module_put(hwhi->hwht.module);
85
86 BUG_ON(hwhi->use < 0);
87
88 out:
89 up_read(&_hwh_lock);
90}
91
92static struct hwh_internal *_alloc_hw_handler(struct hw_handler_type *hwht)
93{
94 struct hwh_internal *hwhi = kzalloc(sizeof(*hwhi), GFP_KERNEL);
95
96 if (hwhi)
97 hwhi->hwht = *hwht;
98
99 return hwhi;
100}
101
102int dm_register_hw_handler(struct hw_handler_type *hwht)
103{
104 int r = 0;
105 struct hwh_internal *hwhi = _alloc_hw_handler(hwht);
106
107 if (!hwhi)
108 return -ENOMEM;
109
110 down_write(&_hwh_lock);
111
112 if (__find_hw_handler_type(hwht->name)) {
113 kfree(hwhi);
114 r = -EEXIST;
115 } else
116 list_add(&hwhi->list, &_hw_handlers);
117
118 up_write(&_hwh_lock);
119
120 return r;
121}
122
123int dm_unregister_hw_handler(struct hw_handler_type *hwht)
124{
125 struct hwh_internal *hwhi;
126
127 down_write(&_hwh_lock);
128
129 hwhi = __find_hw_handler_type(hwht->name);
130 if (!hwhi) {
131 up_write(&_hwh_lock);
132 return -EINVAL;
133 }
134
135 if (hwhi->use) {
136 up_write(&_hwh_lock);
137 return -ETXTBSY;
138 }
139
140 list_del(&hwhi->list);
141
142 up_write(&_hwh_lock);
143
144 kfree(hwhi);
145
146 return 0;
147}
148
149unsigned dm_scsi_err_handler(struct hw_handler *hwh, struct bio *bio)
150{
151#if 0
152 int sense_key, asc, ascq;
153
154 if (bio->bi_error & BIO_SENSE) {
155 /* FIXME: This is just an initial guess. */
156 /* key / asc / ascq */
157 sense_key = (bio->bi_error >> 16) & 0xff;
158 asc = (bio->bi_error >> 8) & 0xff;
159 ascq = bio->bi_error & 0xff;
160
161 switch (sense_key) {
162 /* This block as a whole comes from the device.
163 * So no point retrying on another path. */
164 case 0x03: /* Medium error */
165 case 0x05: /* Illegal request */
166 case 0x07: /* Data protect */
167 case 0x08: /* Blank check */
168 case 0x0a: /* copy aborted */
169 case 0x0c: /* obsolete - no clue ;-) */
170 case 0x0d: /* volume overflow */
171 case 0x0e: /* data miscompare */
172 case 0x0f: /* reserved - no idea either. */
173 return MP_ERROR_IO;
174
175 /* For these errors it's unclear whether they
176 * come from the device or the controller.
177 * So just lets try a different path, and if
178 * it eventually succeeds, user-space will clear
179 * the paths again... */
180 case 0x02: /* Not ready */
181 case 0x04: /* Hardware error */
182 case 0x09: /* vendor specific */
183 case 0x0b: /* Aborted command */
184 return MP_FAIL_PATH;
185
186 case 0x06: /* Unit attention - might want to decode */
187 if (asc == 0x04 && ascq == 0x01)
188 /* "Unit in the process of
189 * becoming ready" */
190 return 0;
191 return MP_FAIL_PATH;
192
193 /* FIXME: For Unit Not Ready we may want
194 * to have a generic pg activation
195 * feature (START_UNIT). */
196
197 /* Should these two ever end up in the
198 * error path? I don't think so. */
199 case 0x00: /* No sense */
200 case 0x01: /* Recovered error */
201 return 0;
202 }
203 }
204#endif
205
206 /* We got no idea how to decode the other kinds of errors ->
207 * assume generic error condition. */
208 return MP_FAIL_PATH;
209}
210
211EXPORT_SYMBOL_GPL(dm_register_hw_handler);
212EXPORT_SYMBOL_GPL(dm_unregister_hw_handler);
213EXPORT_SYMBOL_GPL(dm_scsi_err_handler);
diff --git a/drivers/md/dm-hw-handler.h b/drivers/md/dm-hw-handler.h
deleted file mode 100644
index 46809dcb121..00000000000
--- a/drivers/md/dm-hw-handler.h
+++ /dev/null
@@ -1,63 +0,0 @@
1/*
2 * Copyright (C) 2004 Red Hat, Inc. All rights reserved.
3 *
4 * This file is released under the GPL.
5 *
6 * Multipath hardware handler registration.
7 */
8
9#ifndef DM_HW_HANDLER_H
10#define DM_HW_HANDLER_H
11
12#include <linux/device-mapper.h>
13
14#include "dm-mpath.h"
15
16struct hw_handler_type;
17struct hw_handler {
18 struct hw_handler_type *type;
19 struct mapped_device *md;
20 void *context;
21};
22
23/*
24 * Constructs a hardware handler object, takes custom arguments
25 */
26/* Information about a hardware handler type */
27struct hw_handler_type {
28 char *name;
29 struct module *module;
30
31 int (*create) (struct hw_handler *handler, unsigned int argc,
32 char **argv);
33 void (*destroy) (struct hw_handler *hwh);
34
35 void (*pg_init) (struct hw_handler *hwh, unsigned bypassed,
36 struct dm_path *path);
37 unsigned (*error) (struct hw_handler *hwh, struct bio *bio);
38 int (*status) (struct hw_handler *hwh, status_type_t type,
39 char *result, unsigned int maxlen);
40};
41
42/* Register a hardware handler */
43int dm_register_hw_handler(struct hw_handler_type *type);
44
45/* Unregister a hardware handler */
46int dm_unregister_hw_handler(struct hw_handler_type *type);
47
48/* Returns a registered hardware handler type */
49struct hw_handler_type *dm_get_hw_handler(const char *name);
50
51/* Releases a hardware handler */
52void dm_put_hw_handler(struct hw_handler_type *hwht);
53
54/* Default err function */
55unsigned dm_scsi_err_handler(struct hw_handler *hwh, struct bio *bio);
56
57/* Error flags for err and dm_pg_init_complete */
58#define MP_FAIL_PATH 1
59#define MP_BYPASS_PG 2
60#define MP_ERROR_IO 4 /* Don't retry this I/O */
61#define MP_RETRY 8
62
63#endif
diff --git a/drivers/md/dm-mpath.h b/drivers/md/dm-mpath.h
index b9cdcbb3ed5..c198b856a45 100644
--- a/drivers/md/dm-mpath.h
+++ b/drivers/md/dm-mpath.h
@@ -16,7 +16,6 @@ struct dm_path {
16 unsigned is_active; /* Read-only */ 16 unsigned is_active; /* Read-only */
17 17
18 void *pscontext; /* For path-selector use */ 18 void *pscontext; /* For path-selector use */
19 void *hwhcontext; /* For hw-handler use */
20}; 19};
21 20
22/* Callback for hwh_pg_init_fn to use when complete */ 21/* Callback for hwh_pg_init_fn to use when complete */
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-11 11:44:53 -0500