1
2
3
4#include <linux/kernel.h>
5#include <linux/module.h>
6#include <linux/blkdev.h>
7#include <linux/fault-inject.h>
8
9#include "blk.h"
10
11#ifdef CONFIG_FAIL_IO_TIMEOUT
12
13static DECLARE_FAULT_ATTR(fail_io_timeout);
14
15static int __init setup_fail_io_timeout(char *str)
16{
17 return setup_fault_attr(&fail_io_timeout, str);
18}
19__setup("fail_io_timeout=", setup_fail_io_timeout);
20
21int blk_should_fake_timeout(struct request_queue *q)
22{
23 if (!test_bit(QUEUE_FLAG_FAIL_IO, &q->queue_flags))
24 return 0;
25
26 return should_fail(&fail_io_timeout, 1);
27}
28
29static int __init fail_io_timeout_debugfs(void)
30{
31 return init_fault_attr_dentries(&fail_io_timeout, "fail_io_timeout");
32}
33
34late_initcall(fail_io_timeout_debugfs);
35
36ssize_t part_timeout_show(struct device *dev, struct device_attribute *attr,
37 char *buf)
38{
39 struct gendisk *disk = dev_to_disk(dev);
40 int set = test_bit(QUEUE_FLAG_FAIL_IO, &disk->queue->queue_flags);
41
42 return sprintf(buf, "%d\n", set != 0);
43}
44
45ssize_t part_timeout_store(struct device *dev, struct device_attribute *attr,
46 const char *buf, size_t count)
47{
48 struct gendisk *disk = dev_to_disk(dev);
49 int val;
50
51 if (count) {
52 struct request_queue *q = disk->queue;
53 char *p = (char *) buf;
54
55 val = simple_strtoul(p, &p, 10);
56 spin_lock_irq(q->queue_lock);
57 if (val)
58 queue_flag_set(QUEUE_FLAG_FAIL_IO, q);
59 else
60 queue_flag_clear(QUEUE_FLAG_FAIL_IO, q);
61 spin_unlock_irq(q->queue_lock);
62 }
63
64 return count;
65}
66
67#endif
68
69
70
71
72
73
74void blk_delete_timer(struct request *req)
75{
76 list_del_init(&req->timeout_list);
77}
78
79static void blk_rq_timed_out(struct request *req)
80{
81 struct request_queue *q = req->q;
82 enum blk_eh_timer_return ret;
83
84 ret = q->rq_timed_out_fn(req);
85 switch (ret) {
86 case BLK_EH_HANDLED:
87 __blk_complete_request(req);
88 break;
89 case BLK_EH_RESET_TIMER:
90 blk_clear_rq_complete(req);
91 blk_add_timer(req);
92 break;
93 case BLK_EH_NOT_HANDLED:
94
95
96
97
98
99
100 break;
101 default:
102 printk(KERN_ERR "block: bad eh return: %d\n", ret);
103 break;
104 }
105}
106
107void blk_rq_timed_out_timer(unsigned long data)
108{
109 struct request_queue *q = (struct request_queue *) data;
110 unsigned long flags, next = 0;
111 struct request *rq, *tmp;
112
113 spin_lock_irqsave(q->queue_lock, flags);
114
115 list_for_each_entry_safe(rq, tmp, &q->timeout_list, timeout_list) {
116 if (time_after_eq(jiffies, rq->deadline)) {
117 list_del_init(&rq->timeout_list);
118
119
120
121
122 if (blk_mark_rq_complete(rq))
123 continue;
124 blk_rq_timed_out(rq);
125 } else if (!next || time_after(next, rq->deadline))
126 next = rq->deadline;
127 }
128
129
130
131
132
133
134 if (next)
135 mod_timer(&q->timeout, round_jiffies_up(next));
136
137 spin_unlock_irqrestore(q->queue_lock, flags);
138}
139
140
141
142
143
144
145
146
147
148
149void blk_abort_request(struct request *req)
150{
151 if (blk_mark_rq_complete(req))
152 return;
153 blk_delete_timer(req);
154 blk_rq_timed_out(req);
155}
156EXPORT_SYMBOL_GPL(blk_abort_request);
157
158
159
160
161
162
163
164
165
166void blk_add_timer(struct request *req)
167{
168 struct request_queue *q = req->q;
169 unsigned long expiry;
170
171 if (!q->rq_timed_out_fn)
172 return;
173
174 BUG_ON(!list_empty(&req->timeout_list));
175 BUG_ON(test_bit(REQ_ATOM_COMPLETE, &req->atomic_flags));
176
177
178
179
180
181 if (!req->timeout)
182 req->timeout = q->rq_timeout;
183
184 req->deadline = jiffies + req->timeout;
185 list_add_tail(&req->timeout_list, &q->timeout_list);
186
187
188
189
190
191
192 expiry = round_jiffies_up(req->deadline);
193
194 if (!timer_pending(&q->timeout) ||
195 time_before(expiry, q->timeout.expires))
196 mod_timer(&q->timeout, expiry);
197}
198
199
200
201
202
203
204void blk_abort_queue(struct request_queue *q)
205{
206 unsigned long flags;
207 struct request *rq, *tmp;
208 LIST_HEAD(list);
209
210
211
212
213 if (!q->request_fn)
214 return;
215
216 spin_lock_irqsave(q->queue_lock, flags);
217
218 elv_abort_queue(q);
219
220
221
222
223
224 list_splice_init(&q->timeout_list, &list);
225
226 list_for_each_entry_safe(rq, tmp, &list, timeout_list)
227 blk_abort_request(rq);
228
229
230
231
232
233
234 list_splice(&list, &q->timeout_list);
235
236 spin_unlock_irqrestore(q->queue_lock, flags);
237
238}
239EXPORT_SYMBOL_GPL(blk_abort_queue);
240