From da661267398869a553b7f67d739d360aaa1361b6 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Thu, 14 Jun 2018 13:58:45 +0200 Subject: blk-mq: don't time out requests again that are in the timeout handler We can currently call the timeout handler again on a request that has already been handed over to the timeout handler. Prevent that with a new flag. Fixes: 12f5b931 ("blk-mq: Remove generation seqeunce") Reported-by: Andrew Randrianasulu Tested-by: Andrew Randrianasulu Signed-off-by: Christoph Hellwig Signed-off-by: Jens Axboe --- include/linux/blkdev.h | 2 ++ 1 file changed, 2 insertions(+) (limited to 'include/linux/blkdev.h') diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index bca3a92eb55f..fa6f11751430 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -127,6 +127,8 @@ typedef __u32 __bitwise req_flags_t; #define RQF_ZONE_WRITE_LOCKED ((__force req_flags_t)(1 << 19)) /* already slept for hybrid poll */ #define RQF_MQ_POLL_SLEPT ((__force req_flags_t)(1 << 20)) +/* ->timeout has been called, don't expire again */ +#define RQF_TIMED_OUT ((__force req_flags_t)(1 << 21)) /* flags that prevent us from merging requests: */ #define RQF_NOMERGE_FLAGS \ -- cgit From be7f99c536c5aeebad29082b7d8dce32077fea14 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Fri, 15 Jun 2018 13:55:07 +0200 Subject: block: remov blk_queue_invalidate_tags This function is entirely unused, so remove it and the tag_queue_busy member of struct request_queue. Signed-off-by: Christoph Hellwig Signed-off-by: Jens Axboe --- Documentation/block/biodoc.txt | 15 +-------------- block/blk-tag.c | 22 ---------------------- include/linux/blkdev.h | 2 -- 3 files changed, 1 insertion(+), 38 deletions(-) (limited to 'include/linux/blkdev.h') diff --git a/Documentation/block/biodoc.txt b/Documentation/block/biodoc.txt index 86927029a52d..207eca58efaa 100644 --- a/Documentation/block/biodoc.txt +++ b/Documentation/block/biodoc.txt @@ -752,18 +752,6 @@ completion of the request to the block layer. This means ending tag operations before calling end_that_request_last()! For an example of a user of these helpers, see the IDE tagged command queueing support. -Certain hardware conditions may dictate a need to invalidate the block tag -queue. For instance, on IDE any tagged request error needs to clear both -the hardware and software block queue and enable the driver to sanely restart -all the outstanding requests. There's a third helper to do that: - - blk_queue_invalidate_tags(struct request_queue *q) - - Clear the internal block tag queue and re-add all the pending requests - to the request queue. The driver will receive them again on the - next request_fn run, just like it did the first time it encountered - them. - 3.2.5.2 Tag info Some block functions exist to query current tag status or to go from a @@ -805,8 +793,7 @@ Internally, block manages tags in the blk_queue_tag structure: Most of the above is simple and straight forward, however busy_list may need a bit of explaining. Normally we don't care too much about request ordering, but in the event of any barrier requests in the tag queue we need to ensure -that requests are restarted in the order they were queue. This may happen -if the driver needs to use blk_queue_invalidate_tags(). +that requests are restarted in the order they were queue. 3.3 I/O Submission diff --git a/block/blk-tag.c b/block/blk-tag.c index 09f19c6c52ce..ada0d7cff62b 100644 --- a/block/blk-tag.c +++ b/block/blk-tag.c @@ -188,7 +188,6 @@ int blk_queue_init_tags(struct request_queue *q, int depth, */ q->queue_tags = tags; queue_flag_set_unlocked(QUEUE_FLAG_QUEUED, q); - INIT_LIST_HEAD(&q->tag_busy_list); return 0; } EXPORT_SYMBOL(blk_queue_init_tags); @@ -374,27 +373,6 @@ int blk_queue_start_tag(struct request_queue *q, struct request *rq) rq->tag = tag; bqt->tag_index[tag] = rq; blk_start_request(rq); - list_add(&rq->queuelist, &q->tag_busy_list); return 0; } EXPORT_SYMBOL(blk_queue_start_tag); - -/** - * blk_queue_invalidate_tags - invalidate all pending tags - * @q: the request queue for the device - * - * Description: - * Hardware conditions may dictate a need to stop all pending requests. - * In this case, we will safely clear the block side of the tag queue and - * readd all requests to the request queue in the right order. - **/ -void blk_queue_invalidate_tags(struct request_queue *q) -{ - struct list_head *tmp, *n; - - lockdep_assert_held(q->queue_lock); - - list_for_each_safe(tmp, n, &q->tag_busy_list) - blk_requeue_request(q, list_entry_rq(tmp)); -} -EXPORT_SYMBOL(blk_queue_invalidate_tags); diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index fa6f11751430..9154570edf29 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -562,7 +562,6 @@ struct request_queue { unsigned int dma_alignment; struct blk_queue_tag *queue_tags; - struct list_head tag_busy_list; unsigned int nr_sorted; unsigned int in_flight[2]; @@ -1375,7 +1374,6 @@ extern void blk_queue_end_tag(struct request_queue *, struct request *); extern int blk_queue_init_tags(struct request_queue *, int, struct blk_queue_tag *, int); extern void blk_queue_free_tags(struct request_queue *); extern int blk_queue_resize_tags(struct request_queue *, int); -extern void blk_queue_invalidate_tags(struct request_queue *); extern struct blk_queue_tag *blk_init_tags(int, int); extern void blk_free_tags(struct blk_queue_tag *); -- cgit From 15bfd21fbc5d35834b9ea383dc458a1f0c9e3434 Mon Sep 17 00:00:00 2001 From: Keith Busch Date: Tue, 26 Jun 2018 09:14:58 -0600 Subject: block: Fix transfer when chunk sectors exceeds max A device may have boundary restrictions where the number of sectors between boundaries exceeds its max transfer size. In this case, we need to cap the max size to the smaller of the two limits. Reported-by: Jitendra Bhivare Tested-by: Jitendra Bhivare Cc: Reviewed-by: Martin K. Petersen Signed-off-by: Keith Busch Signed-off-by: Jens Axboe --- include/linux/blkdev.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'include/linux/blkdev.h') diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 9154570edf29..79226ca8f80f 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -1119,8 +1119,8 @@ static inline unsigned int blk_max_size_offset(struct request_queue *q, if (!q->limits.chunk_sectors) return q->limits.max_sectors; - return q->limits.chunk_sectors - - (offset & (q->limits.chunk_sectors - 1)); + return min(q->limits.max_sectors, (unsigned int)(q->limits.chunk_sectors - + (offset & (q->limits.chunk_sectors - 1)))); } static inline unsigned int blk_rq_get_max_sectors(struct request *rq, -- cgit