Blame view
block/blk-timeout.c
5.7 KB
242f9dcb8 block: unify requ... |
1 2 3 4 5 6 |
/* * Functions related to generic timeout handling of requests. */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/blkdev.h> |
581d4e28d block: add fault ... |
7 |
#include <linux/fault-inject.h> |
242f9dcb8 block: unify requ... |
8 9 |
#include "blk.h" |
904158376 block: fix blk_ab... |
10 |
#include "blk-mq.h" |
242f9dcb8 block: unify requ... |
11 |
|
581d4e28d block: add fault ... |
12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 |
#ifdef CONFIG_FAIL_IO_TIMEOUT static DECLARE_FAULT_ATTR(fail_io_timeout); static int __init setup_fail_io_timeout(char *str) { return setup_fault_attr(&fail_io_timeout, str); } __setup("fail_io_timeout=", setup_fail_io_timeout); int blk_should_fake_timeout(struct request_queue *q) { if (!test_bit(QUEUE_FLAG_FAIL_IO, &q->queue_flags)) return 0; return should_fail(&fail_io_timeout, 1); } static int __init fail_io_timeout_debugfs(void) { |
dd48c085c fault-injection: ... |
32 33 |
struct dentry *dir = fault_create_debugfs_attr("fail_io_timeout", NULL, &fail_io_timeout); |
8616ebb16 block: replace IS... |
34 |
return PTR_ERR_OR_ZERO(dir); |
581d4e28d block: add fault ... |
35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 |
} late_initcall(fail_io_timeout_debugfs); ssize_t part_timeout_show(struct device *dev, struct device_attribute *attr, char *buf) { struct gendisk *disk = dev_to_disk(dev); int set = test_bit(QUEUE_FLAG_FAIL_IO, &disk->queue->queue_flags); return sprintf(buf, "%d ", set != 0); } ssize_t part_timeout_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct gendisk *disk = dev_to_disk(dev); int val; if (count) { struct request_queue *q = disk->queue; char *p = (char *) buf; val = simple_strtoul(p, &p, 10); spin_lock_irq(q->queue_lock); if (val) queue_flag_set(QUEUE_FLAG_FAIL_IO, q); else queue_flag_clear(QUEUE_FLAG_FAIL_IO, q); spin_unlock_irq(q->queue_lock); } return count; } #endif /* CONFIG_FAIL_IO_TIMEOUT */ |
242f9dcb8 block: unify requ... |
72 73 74 75 76 77 78 |
/* * blk_delete_timer - Delete/cancel timer for a given function. * @req: request that we are canceling timer for * */ void blk_delete_timer(struct request *req) { |
242f9dcb8 block: unify requ... |
79 |
list_del_init(&req->timeout_list); |
242f9dcb8 block: unify requ... |
80 81 82 83 84 |
} static void blk_rq_timed_out(struct request *req) { struct request_queue *q = req->q; |
80bd7181b block: check for ... |
85 |
enum blk_eh_timer_return ret = BLK_EH_RESET_TIMER; |
242f9dcb8 block: unify requ... |
86 |
|
80bd7181b block: check for ... |
87 88 |
if (q->rq_timed_out_fn) ret = q->rq_timed_out_fn(req); |
242f9dcb8 block: unify requ... |
89 90 |
switch (ret) { case BLK_EH_HANDLED: |
320ae51fe blk-mq: new multi... |
91 |
/* Can we use req->errors here? */ |
46f92d42e blk-mq: unshared ... |
92 |
__blk_complete_request(req); |
242f9dcb8 block: unify requ... |
93 94 |
break; case BLK_EH_RESET_TIMER: |
87ee7b112 blk-mq: fix race ... |
95 |
blk_add_timer(req); |
4912aa6c1 block: fix race b... |
96 |
blk_clear_rq_complete(req); |
242f9dcb8 block: unify requ... |
97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 |
break; case BLK_EH_NOT_HANDLED: /* * LLD handles this for now but in the future * we can send a request msg to abort the command * and we can move more of the generic scsi eh code to * the blk layer. */ break; default: printk(KERN_ERR "block: bad eh return: %d ", ret); break; } } |
46f92d42e blk-mq: unshared ... |
112 |
static void blk_rq_check_expired(struct request *rq, unsigned long *next_timeout, |
320ae51fe blk-mq: new multi... |
113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 |
unsigned int *next_set) { if (time_after_eq(jiffies, rq->deadline)) { list_del_init(&rq->timeout_list); /* * Check if we raced with end io completion */ if (!blk_mark_rq_complete(rq)) blk_rq_timed_out(rq); } else if (!*next_set || time_after(*next_timeout, rq->deadline)) { *next_timeout = rq->deadline; *next_set = 1; } } |
242f9dcb8 block: unify requ... |
128 129 130 |
void blk_rq_timed_out_timer(unsigned long data) { struct request_queue *q = (struct request_queue *) data; |
565e411d7 block: optimizati... |
131 |
unsigned long flags, next = 0; |
242f9dcb8 block: unify requ... |
132 |
struct request *rq, *tmp; |
a534dbe96 block: ensure jif... |
133 |
int next_set = 0; |
242f9dcb8 block: unify requ... |
134 135 |
spin_lock_irqsave(q->queue_lock, flags); |
320ae51fe blk-mq: new multi... |
136 137 |
list_for_each_entry_safe(rq, tmp, &q->timeout_list, timeout_list) blk_rq_check_expired(rq, &next, &next_set); |
242f9dcb8 block: unify requ... |
138 |
|
a534dbe96 block: ensure jif... |
139 |
if (next_set) |
7838c15b8 Block: use round_... |
140 |
mod_timer(&q->timeout, round_jiffies_up(next)); |
242f9dcb8 block: unify requ... |
141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 |
spin_unlock_irqrestore(q->queue_lock, flags); } /** * blk_abort_request -- Request request recovery for the specified command * @req: pointer to the request of interest * * This function requests that the block layer start recovery for the * request by deleting the timer and calling the q's timeout function. * LLDDs who implement their own error recovery MAY ignore the timeout * event if they generated blk_abort_req. Must hold queue lock. */ void blk_abort_request(struct request *req) { |
7ba1fbaa4 block: use rq com... |
156 157 |
if (blk_mark_rq_complete(req)) return; |
242f9dcb8 block: unify requ... |
158 |
blk_delete_timer(req); |
904158376 block: fix blk_ab... |
159 160 161 162 |
if (req->q->mq_ops) blk_mq_rq_timed_out(req, false); else blk_rq_timed_out(req); |
242f9dcb8 block: unify requ... |
163 164 |
} EXPORT_SYMBOL_GPL(blk_abort_request); |
0d2602ca3 blk-mq: improve s... |
165 166 167 168 169 170 171 172 173 174 |
unsigned long blk_rq_timeout(unsigned long timeout) { unsigned long maxt; maxt = round_jiffies_up(jiffies + BLK_MAX_TIMEOUT); if (time_after(timeout, maxt)) timeout = maxt; return timeout; } |
c4a634f43 block: fold __blk... |
175 176 177 178 179 180 181 182 183 |
/** * blk_add_timer - Start timeout timer for a single request * @req: request that is about to start running. * * Notes: * Each request has its own timer, and as it is added to the queue, we * set up the timer. When the request completes, we cancel the timer. */ void blk_add_timer(struct request *req) |
242f9dcb8 block: unify requ... |
184 185 186 |
{ struct request_queue *q = req->q; unsigned long expiry; |
5b3f25fc3 blk-mq: Allow req... |
187 188 |
if (req->cmd_flags & REQ_NO_TIMEOUT) return; |
5e940aaa5 blk-timeout: fix ... |
189 190 |
/* blk-mq has its own handler, so we don't need ->rq_timed_out_fn */ if (!q->mq_ops && !q->rq_timed_out_fn) |
242f9dcb8 block: unify requ... |
191 192 193 |
return; BUG_ON(!list_empty(&req->timeout_list)); |
242f9dcb8 block: unify requ... |
194 |
|
2eef33e43 block: clean up m... |
195 196 197 198 199 |
/* * Some LLDs, like scsi, peek at the timeout to prevent a * command from being retried forever. */ if (!req->timeout) |
242f9dcb8 block: unify requ... |
200 |
req->timeout = q->rq_timeout; |
2eef33e43 block: clean up m... |
201 202 |
req->deadline = jiffies + req->timeout; |
c4a634f43 block: fold __blk... |
203 204 |
if (!q->mq_ops) list_add_tail(&req->timeout_list, &req->q->timeout_list); |
242f9dcb8 block: unify requ... |
205 206 207 |
/* * If the timer isn't already pending or this timeout is earlier |
7838c15b8 Block: use round_... |
208 |
* than an existing one, modify the timer. Round up to next nearest |
242f9dcb8 block: unify requ... |
209 210 |
* second. */ |
0d2602ca3 blk-mq: improve s... |
211 |
expiry = blk_rq_timeout(round_jiffies_up(req->deadline)); |
242f9dcb8 block: unify requ... |
212 213 |
if (!timer_pending(&q->timeout) || |
f793aa537 block: relax when... |
214 215 216 217 218 219 220 221 222 223 |
time_before(expiry, q->timeout.expires)) { unsigned long diff = q->timeout.expires - expiry; /* * Due to added timer slack to group timers, the timer * will often be a little in front of what we asked for. * So apply some tolerance here too, otherwise we keep * modifying the timer because expires for value X * will be X + something. */ |
c7bca4183 block: ensure tha... |
224 |
if (!timer_pending(&q->timeout) || (diff >= HZ / 2)) |
f793aa537 block: relax when... |
225 226 |
mod_timer(&q->timeout, expiry); } |
320ae51fe blk-mq: new multi... |
227 228 |
} |