blk-timeout.c (4ba25a496f62129a2ad8c2436ab2b402752dc66c) blk-timeout.c (320ae51feed5c2f13664aa05a76bec198967e04d)
1/*
2 * Functions related to generic timeout handling of requests.
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"
1/*
2 * Functions related to generic timeout handling of requests.
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#include "blk-mq.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);

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83{
84 struct request_queue *q = req->q;
85 enum blk_eh_timer_return ret = BLK_EH_RESET_TIMER;
86
87 if (q->rq_timed_out_fn)
88 ret = q->rq_timed_out_fn(req);
89 switch (ret) {
90 case BLK_EH_HANDLED:
11
12#ifdef CONFIG_FAIL_IO_TIMEOUT
13
14static DECLARE_FAULT_ATTR(fail_io_timeout);
15
16static int __init setup_fail_io_timeout(char *str)
17{
18 return setup_fault_attr(&fail_io_timeout, str);

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84{
85 struct request_queue *q = req->q;
86 enum blk_eh_timer_return ret = BLK_EH_RESET_TIMER;
87
88 if (q->rq_timed_out_fn)
89 ret = q->rq_timed_out_fn(req);
90 switch (ret) {
91 case BLK_EH_HANDLED:
91 __blk_complete_request(req);
92 /* Can we use req->errors here? */
93 if (q->mq_ops)
94 blk_mq_complete_request(req, req->errors);
95 else
96 __blk_complete_request(req);
92 break;
93 case BLK_EH_RESET_TIMER:
94 blk_clear_rq_complete(req);
97 break;
98 case BLK_EH_RESET_TIMER:
99 blk_clear_rq_complete(req);
95 blk_add_timer(req);
100 if (q->mq_ops)
101 blk_mq_add_timer(req);
102 else
103 blk_add_timer(req);
96 break;
97 case BLK_EH_NOT_HANDLED:
98 /*
99 * LLD handles this for now but in the future
100 * we can send a request msg to abort the command
101 * and we can move more of the generic scsi eh code to
102 * the blk layer.
103 */
104 break;
105 default:
106 printk(KERN_ERR "block: bad eh return: %d\n", ret);
107 break;
108 }
109}
110
104 break;
105 case BLK_EH_NOT_HANDLED:
106 /*
107 * LLD handles this for now but in the future
108 * we can send a request msg to abort the command
109 * and we can move more of the generic scsi eh code to
110 * the blk layer.
111 */
112 break;
113 default:
114 printk(KERN_ERR "block: bad eh return: %d\n", ret);
115 break;
116 }
117}
118
119void blk_rq_check_expired(struct request *rq, unsigned long *next_timeout,
120 unsigned int *next_set)
121{
122 if (time_after_eq(jiffies, rq->deadline)) {
123 list_del_init(&rq->timeout_list);
124
125 /*
126 * Check if we raced with end io completion
127 */
128 if (!blk_mark_rq_complete(rq))
129 blk_rq_timed_out(rq);
130 } else if (!*next_set || time_after(*next_timeout, rq->deadline)) {
131 *next_timeout = rq->deadline;
132 *next_set = 1;
133 }
134}
135
111void blk_rq_timed_out_timer(unsigned long data)
112{
113 struct request_queue *q = (struct request_queue *) data;
114 unsigned long flags, next = 0;
115 struct request *rq, *tmp;
116 int next_set = 0;
117
118 spin_lock_irqsave(q->queue_lock, flags);
119
136void blk_rq_timed_out_timer(unsigned long data)
137{
138 struct request_queue *q = (struct request_queue *) data;
139 unsigned long flags, next = 0;
140 struct request *rq, *tmp;
141 int next_set = 0;
142
143 spin_lock_irqsave(q->queue_lock, flags);
144
120 list_for_each_entry_safe(rq, tmp, &q->timeout_list, timeout_list) {
121 if (time_after_eq(jiffies, rq->deadline)) {
122 list_del_init(&rq->timeout_list);
145 list_for_each_entry_safe(rq, tmp, &q->timeout_list, timeout_list)
146 blk_rq_check_expired(rq, &next, &next_set);
123
147
124 /*
125 * Check if we raced with end io completion
126 */
127 if (blk_mark_rq_complete(rq))
128 continue;
129 blk_rq_timed_out(rq);
130 } else if (!next_set || time_after(next, rq->deadline)) {
131 next = rq->deadline;
132 next_set = 1;
133 }
134 }
135
136 if (next_set)
137 mod_timer(&q->timeout, round_jiffies_up(next));
138
139 spin_unlock_irqrestore(q->queue_lock, flags);
140}
141
142/**
143 * blk_abort_request -- Request request recovery for the specified command

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152{
153 if (blk_mark_rq_complete(req))
154 return;
155 blk_delete_timer(req);
156 blk_rq_timed_out(req);
157}
158EXPORT_SYMBOL_GPL(blk_abort_request);
159
148 if (next_set)
149 mod_timer(&q->timeout, round_jiffies_up(next));
150
151 spin_unlock_irqrestore(q->queue_lock, flags);
152}
153
154/**
155 * blk_abort_request -- Request request recovery for the specified command

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164{
165 if (blk_mark_rq_complete(req))
166 return;
167 blk_delete_timer(req);
168 blk_rq_timed_out(req);
169}
170EXPORT_SYMBOL_GPL(blk_abort_request);
171
160/**
161 * blk_add_timer - Start timeout timer for a single request
162 * @req: request that is about to start running.
163 *
164 * Notes:
165 * Each request has its own timer, and as it is added to the queue, we
166 * set up the timer. When the request completes, we cancel the timer.
167 */
168void blk_add_timer(struct request *req)
172void __blk_add_timer(struct request *req, struct list_head *timeout_list)
169{
170 struct request_queue *q = req->q;
171 unsigned long expiry;
172
173 if (!q->rq_timed_out_fn)
174 return;
175
176 BUG_ON(!list_empty(&req->timeout_list));
177 BUG_ON(test_bit(REQ_ATOM_COMPLETE, &req->atomic_flags));
178
179 /*
180 * Some LLDs, like scsi, peek at the timeout to prevent a
181 * command from being retried forever.
182 */
183 if (!req->timeout)
184 req->timeout = q->rq_timeout;
185
186 req->deadline = jiffies + req->timeout;
173{
174 struct request_queue *q = req->q;
175 unsigned long expiry;
176
177 if (!q->rq_timed_out_fn)
178 return;
179
180 BUG_ON(!list_empty(&req->timeout_list));
181 BUG_ON(test_bit(REQ_ATOM_COMPLETE, &req->atomic_flags));
182
183 /*
184 * Some LLDs, like scsi, peek at the timeout to prevent a
185 * command from being retried forever.
186 */
187 if (!req->timeout)
188 req->timeout = q->rq_timeout;
189
190 req->deadline = jiffies + req->timeout;
187 list_add_tail(&req->timeout_list, &q->timeout_list);
191 if (timeout_list)
192 list_add_tail(&req->timeout_list, timeout_list);
188
189 /*
190 * If the timer isn't already pending or this timeout is earlier
191 * than an existing one, modify the timer. Round up to next nearest
192 * second.
193 */
194 expiry = round_jiffies_up(req->deadline);
195
196 if (!timer_pending(&q->timeout) ||
197 time_before(expiry, q->timeout.expires))
198 mod_timer(&q->timeout, expiry);
193
194 /*
195 * If the timer isn't already pending or this timeout is earlier
196 * than an existing one, modify the timer. Round up to next nearest
197 * second.
198 */
199 expiry = round_jiffies_up(req->deadline);
200
201 if (!timer_pending(&q->timeout) ||
202 time_before(expiry, q->timeout.expires))
203 mod_timer(&q->timeout, expiry);
204
199}
200
205}
206
207/**
208 * blk_add_timer - Start timeout timer for a single request
209 * @req: request that is about to start running.
210 *
211 * Notes:
212 * Each request has its own timer, and as it is added to the queue, we
213 * set up the timer. When the request completes, we cancel the timer.
214 */
215void blk_add_timer(struct request *req)
216{
217 __blk_add_timer(req, &req->q->timeout_list);
218}
219