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block/blk-timeout.c
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// SPDX-License-Identifier: GPL-2.0 |
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/* * Functions related to generic timeout handling of requests. */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/blkdev.h> |
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#include <linux/fault-inject.h> |
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#include "blk.h" |
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#include "blk-mq.h" |
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#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); |
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bool __blk_should_fake_timeout(struct request_queue *q) |
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{ |
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return should_fail(&fail_io_timeout, 1); } |
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EXPORT_SYMBOL_GPL(__blk_should_fake_timeout); |
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static int __init fail_io_timeout_debugfs(void) { |
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struct dentry *dir = fault_create_debugfs_attr("fail_io_timeout", NULL, &fail_io_timeout); |
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return PTR_ERR_OR_ZERO(dir); |
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} 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); |
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if (val) |
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blk_queue_flag_set(QUEUE_FLAG_FAIL_IO, q); |
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else |
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blk_queue_flag_clear(QUEUE_FLAG_FAIL_IO, q); |
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} return count; } #endif /* CONFIG_FAIL_IO_TIMEOUT */ |
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/** |
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* blk_abort_request - Request recovery for the specified command |
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* @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 |
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* event if they generated blk_abort_request. |
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*/ void blk_abort_request(struct request *req) { |
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/* * All we need to ensure is that timeout scan takes place * immediately and that scan sees the new timeout value. * No need for fancy synchronizations. */ |
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WRITE_ONCE(req->deadline, jiffies); |
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kblockd_schedule_work(&req->q->timeout_work); |
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} EXPORT_SYMBOL_GPL(blk_abort_request); |
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static unsigned long blk_timeout_mask __read_mostly; |
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static int __init blk_timeout_init(void) |
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{ blk_timeout_mask = roundup_pow_of_two(HZ) - 1; return 0; } late_initcall(blk_timeout_init); /* * Just a rough estimate, we don't care about specific values for timeouts. */ static inline unsigned long blk_round_jiffies(unsigned long j) { return (j + blk_timeout_mask) + 1; } |
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unsigned long blk_rq_timeout(unsigned long timeout) { unsigned long maxt; |
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maxt = blk_round_jiffies(jiffies + BLK_MAX_TIMEOUT); |
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if (time_after(timeout, maxt)) timeout = maxt; return timeout; } |
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/** * 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) |
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{ struct request_queue *q = req->q; unsigned long expiry; |
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/* * Some LLDs, like scsi, peek at the timeout to prevent a * command from being retried forever. */ if (!req->timeout) |
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req->timeout = q->rq_timeout; |
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req->rq_flags &= ~RQF_TIMED_OUT; |
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expiry = jiffies + req->timeout; WRITE_ONCE(req->deadline, expiry); |
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/* |
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* If the timer isn't already pending or this timeout is earlier |
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* than an existing one, modify the timer. Round up to next nearest |
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* second. */ |
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expiry = blk_rq_timeout(blk_round_jiffies(expiry)); |
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if (!timer_pending(&q->timeout) || |
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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. */ |
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if (!timer_pending(&q->timeout) || (diff >= HZ / 2)) |
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mod_timer(&q->timeout, expiry); } |
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} |