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![Omar Sandoval](/assets/img/avatar_default.png)
Normally I wouldn't bother with this, but in my opinion the comments are the most important part of this whole file since without them no one would have any clue how this insanity works. Signed-off-by: Omar Sandoval <osandov@fb.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
584 lines
17 KiB
C
584 lines
17 KiB
C
/*
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* Functions to sequence PREFLUSH and FUA writes.
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*
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* Copyright (C) 2011 Max Planck Institute for Gravitational Physics
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* Copyright (C) 2011 Tejun Heo <tj@kernel.org>
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*
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* This file is released under the GPLv2.
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*
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* REQ_{PREFLUSH|FUA} requests are decomposed to sequences consisted of three
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* optional steps - PREFLUSH, DATA and POSTFLUSH - according to the request
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* properties and hardware capability.
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*
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* If a request doesn't have data, only REQ_PREFLUSH makes sense, which
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* indicates a simple flush request. If there is data, REQ_PREFLUSH indicates
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* that the device cache should be flushed before the data is executed, and
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* REQ_FUA means that the data must be on non-volatile media on request
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* completion.
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*
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* If the device doesn't have writeback cache, PREFLUSH and FUA don't make any
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* difference. The requests are either completed immediately if there's no data
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* or executed as normal requests otherwise.
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*
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* If the device has writeback cache and supports FUA, REQ_PREFLUSH is
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* translated to PREFLUSH but REQ_FUA is passed down directly with DATA.
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*
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* If the device has writeback cache and doesn't support FUA, REQ_PREFLUSH
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* is translated to PREFLUSH and REQ_FUA to POSTFLUSH.
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*
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* The actual execution of flush is double buffered. Whenever a request
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* needs to execute PRE or POSTFLUSH, it queues at
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* fq->flush_queue[fq->flush_pending_idx]. Once certain criteria are met, a
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* REQ_OP_FLUSH is issued and the pending_idx is toggled. When the flush
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* completes, all the requests which were pending are proceeded to the next
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* step. This allows arbitrary merging of different types of PREFLUSH/FUA
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* requests.
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*
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* Currently, the following conditions are used to determine when to issue
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* flush.
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*
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* C1. At any given time, only one flush shall be in progress. This makes
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* double buffering sufficient.
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*
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* C2. Flush is deferred if any request is executing DATA of its sequence.
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* This avoids issuing separate POSTFLUSHes for requests which shared
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* PREFLUSH.
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*
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* C3. The second condition is ignored if there is a request which has
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* waited longer than FLUSH_PENDING_TIMEOUT. This is to avoid
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* starvation in the unlikely case where there are continuous stream of
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* FUA (without PREFLUSH) requests.
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*
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* For devices which support FUA, it isn't clear whether C2 (and thus C3)
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* is beneficial.
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*
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* Note that a sequenced PREFLUSH/FUA request with DATA is completed twice.
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* Once while executing DATA and again after the whole sequence is
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* complete. The first completion updates the contained bio but doesn't
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* finish it so that the bio submitter is notified only after the whole
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* sequence is complete. This is implemented by testing RQF_FLUSH_SEQ in
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* req_bio_endio().
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*
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* The above peculiarity requires that each PREFLUSH/FUA request has only one
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* bio attached to it, which is guaranteed as they aren't allowed to be
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* merged in the usual way.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/bio.h>
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#include <linux/blkdev.h>
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#include <linux/gfp.h>
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#include <linux/blk-mq.h>
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#include "blk.h"
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#include "blk-mq.h"
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#include "blk-mq-tag.h"
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#include "blk-mq-sched.h"
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/* PREFLUSH/FUA sequences */
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enum {
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REQ_FSEQ_PREFLUSH = (1 << 0), /* pre-flushing in progress */
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REQ_FSEQ_DATA = (1 << 1), /* data write in progress */
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REQ_FSEQ_POSTFLUSH = (1 << 2), /* post-flushing in progress */
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REQ_FSEQ_DONE = (1 << 3),
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REQ_FSEQ_ACTIONS = REQ_FSEQ_PREFLUSH | REQ_FSEQ_DATA |
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REQ_FSEQ_POSTFLUSH,
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/*
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* If flush has been pending longer than the following timeout,
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* it's issued even if flush_data requests are still in flight.
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*/
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FLUSH_PENDING_TIMEOUT = 5 * HZ,
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};
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static bool blk_kick_flush(struct request_queue *q,
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struct blk_flush_queue *fq);
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static unsigned int blk_flush_policy(unsigned long fflags, struct request *rq)
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{
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unsigned int policy = 0;
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if (blk_rq_sectors(rq))
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policy |= REQ_FSEQ_DATA;
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if (fflags & (1UL << QUEUE_FLAG_WC)) {
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if (rq->cmd_flags & REQ_PREFLUSH)
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policy |= REQ_FSEQ_PREFLUSH;
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if (!(fflags & (1UL << QUEUE_FLAG_FUA)) &&
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(rq->cmd_flags & REQ_FUA))
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policy |= REQ_FSEQ_POSTFLUSH;
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}
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return policy;
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}
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static unsigned int blk_flush_cur_seq(struct request *rq)
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{
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return 1 << ffz(rq->flush.seq);
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}
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static void blk_flush_restore_request(struct request *rq)
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{
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/*
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* After flush data completion, @rq->bio is %NULL but we need to
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* complete the bio again. @rq->biotail is guaranteed to equal the
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* original @rq->bio. Restore it.
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*/
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rq->bio = rq->biotail;
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/* make @rq a normal request */
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rq->rq_flags &= ~RQF_FLUSH_SEQ;
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rq->end_io = rq->flush.saved_end_io;
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}
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static bool blk_flush_queue_rq(struct request *rq, bool add_front)
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{
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if (rq->q->mq_ops) {
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blk_mq_add_to_requeue_list(rq, add_front, true);
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return false;
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} else {
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if (add_front)
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list_add(&rq->queuelist, &rq->q->queue_head);
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else
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list_add_tail(&rq->queuelist, &rq->q->queue_head);
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return true;
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}
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}
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/**
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* blk_flush_complete_seq - complete flush sequence
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* @rq: PREFLUSH/FUA request being sequenced
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* @fq: flush queue
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* @seq: sequences to complete (mask of %REQ_FSEQ_*, can be zero)
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* @error: whether an error occurred
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*
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* @rq just completed @seq part of its flush sequence, record the
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* completion and trigger the next step.
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*
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* CONTEXT:
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* spin_lock_irq(q->queue_lock or fq->mq_flush_lock)
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*
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* RETURNS:
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* %true if requests were added to the dispatch queue, %false otherwise.
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*/
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static bool blk_flush_complete_seq(struct request *rq,
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struct blk_flush_queue *fq,
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unsigned int seq, blk_status_t error)
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{
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struct request_queue *q = rq->q;
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struct list_head *pending = &fq->flush_queue[fq->flush_pending_idx];
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bool queued = false, kicked;
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BUG_ON(rq->flush.seq & seq);
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rq->flush.seq |= seq;
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if (likely(!error))
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seq = blk_flush_cur_seq(rq);
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else
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seq = REQ_FSEQ_DONE;
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switch (seq) {
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case REQ_FSEQ_PREFLUSH:
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case REQ_FSEQ_POSTFLUSH:
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/* queue for flush */
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if (list_empty(pending))
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fq->flush_pending_since = jiffies;
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list_move_tail(&rq->flush.list, pending);
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break;
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case REQ_FSEQ_DATA:
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list_move_tail(&rq->flush.list, &fq->flush_data_in_flight);
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queued = blk_flush_queue_rq(rq, true);
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break;
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case REQ_FSEQ_DONE:
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/*
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* @rq was previously adjusted by blk_flush_issue() for
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* flush sequencing and may already have gone through the
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* flush data request completion path. Restore @rq for
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* normal completion and end it.
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*/
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BUG_ON(!list_empty(&rq->queuelist));
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list_del_init(&rq->flush.list);
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blk_flush_restore_request(rq);
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if (q->mq_ops)
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blk_mq_end_request(rq, error);
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else
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__blk_end_request_all(rq, error);
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break;
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default:
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BUG();
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}
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kicked = blk_kick_flush(q, fq);
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return kicked | queued;
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}
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static void flush_end_io(struct request *flush_rq, blk_status_t error)
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{
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struct request_queue *q = flush_rq->q;
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struct list_head *running;
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bool queued = false;
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struct request *rq, *n;
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unsigned long flags = 0;
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struct blk_flush_queue *fq = blk_get_flush_queue(q, flush_rq->mq_ctx);
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if (q->mq_ops) {
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struct blk_mq_hw_ctx *hctx;
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/* release the tag's ownership to the req cloned from */
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spin_lock_irqsave(&fq->mq_flush_lock, flags);
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hctx = blk_mq_map_queue(q, flush_rq->mq_ctx->cpu);
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blk_mq_tag_set_rq(hctx, flush_rq->tag, fq->orig_rq);
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flush_rq->tag = -1;
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}
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running = &fq->flush_queue[fq->flush_running_idx];
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BUG_ON(fq->flush_pending_idx == fq->flush_running_idx);
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/* account completion of the flush request */
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fq->flush_running_idx ^= 1;
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if (!q->mq_ops)
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elv_completed_request(q, flush_rq);
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/* and push the waiting requests to the next stage */
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list_for_each_entry_safe(rq, n, running, flush.list) {
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unsigned int seq = blk_flush_cur_seq(rq);
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BUG_ON(seq != REQ_FSEQ_PREFLUSH && seq != REQ_FSEQ_POSTFLUSH);
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queued |= blk_flush_complete_seq(rq, fq, seq, error);
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}
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/*
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* Kick the queue to avoid stall for two cases:
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* 1. Moving a request silently to empty queue_head may stall the
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* queue.
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* 2. When flush request is running in non-queueable queue, the
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* queue is hold. Restart the queue after flush request is finished
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* to avoid stall.
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* This function is called from request completion path and calling
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* directly into request_fn may confuse the driver. Always use
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* kblockd.
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*/
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if (queued || fq->flush_queue_delayed) {
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WARN_ON(q->mq_ops);
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blk_run_queue_async(q);
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}
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fq->flush_queue_delayed = 0;
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if (q->mq_ops)
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spin_unlock_irqrestore(&fq->mq_flush_lock, flags);
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}
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/**
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* blk_kick_flush - consider issuing flush request
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* @q: request_queue being kicked
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* @fq: flush queue
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*
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* Flush related states of @q have changed, consider issuing flush request.
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* Please read the comment at the top of this file for more info.
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*
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* CONTEXT:
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* spin_lock_irq(q->queue_lock or fq->mq_flush_lock)
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*
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* RETURNS:
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* %true if flush was issued, %false otherwise.
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*/
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static bool blk_kick_flush(struct request_queue *q, struct blk_flush_queue *fq)
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{
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struct list_head *pending = &fq->flush_queue[fq->flush_pending_idx];
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struct request *first_rq =
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list_first_entry(pending, struct request, flush.list);
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struct request *flush_rq = fq->flush_rq;
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/* C1 described at the top of this file */
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if (fq->flush_pending_idx != fq->flush_running_idx || list_empty(pending))
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return false;
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/* C2 and C3
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*
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* For blk-mq + scheduling, we can risk having all driver tags
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* assigned to empty flushes, and we deadlock if we are expecting
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* other requests to make progress. Don't defer for that case.
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*/
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if (!list_empty(&fq->flush_data_in_flight) &&
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!(q->mq_ops && q->elevator) &&
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time_before(jiffies,
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fq->flush_pending_since + FLUSH_PENDING_TIMEOUT))
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return false;
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/*
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* Issue flush and toggle pending_idx. This makes pending_idx
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* different from running_idx, which means flush is in flight.
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*/
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fq->flush_pending_idx ^= 1;
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blk_rq_init(q, flush_rq);
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/*
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* Borrow tag from the first request since they can't
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* be in flight at the same time. And acquire the tag's
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* ownership for flush req.
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*/
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if (q->mq_ops) {
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struct blk_mq_hw_ctx *hctx;
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flush_rq->mq_ctx = first_rq->mq_ctx;
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flush_rq->tag = first_rq->tag;
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fq->orig_rq = first_rq;
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hctx = blk_mq_map_queue(q, first_rq->mq_ctx->cpu);
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blk_mq_tag_set_rq(hctx, first_rq->tag, flush_rq);
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}
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flush_rq->cmd_flags = REQ_OP_FLUSH | REQ_PREFLUSH;
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flush_rq->rq_flags |= RQF_FLUSH_SEQ;
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flush_rq->rq_disk = first_rq->rq_disk;
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flush_rq->end_io = flush_end_io;
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return blk_flush_queue_rq(flush_rq, false);
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}
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static void flush_data_end_io(struct request *rq, blk_status_t error)
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{
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struct request_queue *q = rq->q;
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struct blk_flush_queue *fq = blk_get_flush_queue(q, NULL);
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lockdep_assert_held(q->queue_lock);
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/*
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* Updating q->in_flight[] here for making this tag usable
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* early. Because in blk_queue_start_tag(),
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* q->in_flight[BLK_RW_ASYNC] is used to limit async I/O and
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* reserve tags for sync I/O.
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*
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* More importantly this way can avoid the following I/O
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* deadlock:
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*
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* - suppose there are 40 fua requests comming to flush queue
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* and queue depth is 31
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* - 30 rqs are scheduled then blk_queue_start_tag() can't alloc
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* tag for async I/O any more
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* - all the 30 rqs are completed before FLUSH_PENDING_TIMEOUT
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* and flush_data_end_io() is called
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* - the other rqs still can't go ahead if not updating
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* q->in_flight[BLK_RW_ASYNC] here, meantime these rqs
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* are held in flush data queue and make no progress of
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* handling post flush rq
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* - only after the post flush rq is handled, all these rqs
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* can be completed
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*/
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elv_completed_request(q, rq);
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/* for avoiding double accounting */
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rq->rq_flags &= ~RQF_STARTED;
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/*
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* After populating an empty queue, kick it to avoid stall. Read
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* the comment in flush_end_io().
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*/
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if (blk_flush_complete_seq(rq, fq, REQ_FSEQ_DATA, error))
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blk_run_queue_async(q);
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}
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static void mq_flush_data_end_io(struct request *rq, blk_status_t error)
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{
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struct request_queue *q = rq->q;
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struct blk_mq_hw_ctx *hctx;
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struct blk_mq_ctx *ctx = rq->mq_ctx;
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unsigned long flags;
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struct blk_flush_queue *fq = blk_get_flush_queue(q, ctx);
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hctx = blk_mq_map_queue(q, ctx->cpu);
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/*
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* After populating an empty queue, kick it to avoid stall. Read
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* the comment in flush_end_io().
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*/
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spin_lock_irqsave(&fq->mq_flush_lock, flags);
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blk_flush_complete_seq(rq, fq, REQ_FSEQ_DATA, error);
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spin_unlock_irqrestore(&fq->mq_flush_lock, flags);
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blk_mq_run_hw_queue(hctx, true);
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}
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/**
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* blk_insert_flush - insert a new PREFLUSH/FUA request
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* @rq: request to insert
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*
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* To be called from __elv_add_request() for %ELEVATOR_INSERT_FLUSH insertions.
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* or __blk_mq_run_hw_queue() to dispatch request.
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* @rq is being submitted. Analyze what needs to be done and put it on the
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* right queue.
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*/
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void blk_insert_flush(struct request *rq)
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{
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struct request_queue *q = rq->q;
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unsigned long fflags = q->queue_flags; /* may change, cache */
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unsigned int policy = blk_flush_policy(fflags, rq);
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struct blk_flush_queue *fq = blk_get_flush_queue(q, rq->mq_ctx);
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if (!q->mq_ops)
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lockdep_assert_held(q->queue_lock);
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/*
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* @policy now records what operations need to be done. Adjust
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* REQ_PREFLUSH and FUA for the driver.
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*/
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rq->cmd_flags &= ~REQ_PREFLUSH;
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if (!(fflags & (1UL << QUEUE_FLAG_FUA)))
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rq->cmd_flags &= ~REQ_FUA;
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/*
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* REQ_PREFLUSH|REQ_FUA implies REQ_SYNC, so if we clear any
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* of those flags, we have to set REQ_SYNC to avoid skewing
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* the request accounting.
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*/
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rq->cmd_flags |= REQ_SYNC;
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/*
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* An empty flush handed down from a stacking driver may
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* translate into nothing if the underlying device does not
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* advertise a write-back cache. In this case, simply
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* complete the request.
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*/
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if (!policy) {
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if (q->mq_ops)
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blk_mq_end_request(rq, 0);
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else
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__blk_end_request(rq, 0, 0);
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return;
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}
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BUG_ON(rq->bio != rq->biotail); /*assumes zero or single bio rq */
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/*
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* If there's data but flush is not necessary, the request can be
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* processed directly without going through flush machinery. Queue
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* for normal execution.
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*/
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if ((policy & REQ_FSEQ_DATA) &&
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!(policy & (REQ_FSEQ_PREFLUSH | REQ_FSEQ_POSTFLUSH))) {
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if (q->mq_ops)
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blk_mq_sched_insert_request(rq, false, true, false, false);
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else
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list_add_tail(&rq->queuelist, &q->queue_head);
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return;
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}
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/*
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* @rq should go through flush machinery. Mark it part of flush
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|
* sequence and submit for further processing.
|
|
*/
|
|
memset(&rq->flush, 0, sizeof(rq->flush));
|
|
INIT_LIST_HEAD(&rq->flush.list);
|
|
rq->rq_flags |= RQF_FLUSH_SEQ;
|
|
rq->flush.saved_end_io = rq->end_io; /* Usually NULL */
|
|
if (q->mq_ops) {
|
|
rq->end_io = mq_flush_data_end_io;
|
|
|
|
spin_lock_irq(&fq->mq_flush_lock);
|
|
blk_flush_complete_seq(rq, fq, REQ_FSEQ_ACTIONS & ~policy, 0);
|
|
spin_unlock_irq(&fq->mq_flush_lock);
|
|
return;
|
|
}
|
|
rq->end_io = flush_data_end_io;
|
|
|
|
blk_flush_complete_seq(rq, fq, REQ_FSEQ_ACTIONS & ~policy, 0);
|
|
}
|
|
|
|
/**
|
|
* blkdev_issue_flush - queue a flush
|
|
* @bdev: blockdev to issue flush for
|
|
* @gfp_mask: memory allocation flags (for bio_alloc)
|
|
* @error_sector: error sector
|
|
*
|
|
* Description:
|
|
* Issue a flush for the block device in question. Caller can supply
|
|
* room for storing the error offset in case of a flush error, if they
|
|
* wish to.
|
|
*/
|
|
int blkdev_issue_flush(struct block_device *bdev, gfp_t gfp_mask,
|
|
sector_t *error_sector)
|
|
{
|
|
struct request_queue *q;
|
|
struct bio *bio;
|
|
int ret = 0;
|
|
|
|
if (bdev->bd_disk == NULL)
|
|
return -ENXIO;
|
|
|
|
q = bdev_get_queue(bdev);
|
|
if (!q)
|
|
return -ENXIO;
|
|
|
|
/*
|
|
* some block devices may not have their queue correctly set up here
|
|
* (e.g. loop device without a backing file) and so issuing a flush
|
|
* here will panic. Ensure there is a request function before issuing
|
|
* the flush.
|
|
*/
|
|
if (!q->make_request_fn)
|
|
return -ENXIO;
|
|
|
|
bio = bio_alloc(gfp_mask, 0);
|
|
bio_set_dev(bio, bdev);
|
|
bio->bi_opf = REQ_OP_WRITE | REQ_PREFLUSH;
|
|
|
|
ret = submit_bio_wait(bio);
|
|
|
|
/*
|
|
* The driver must store the error location in ->bi_sector, if
|
|
* it supports it. For non-stacked drivers, this should be
|
|
* copied from blk_rq_pos(rq).
|
|
*/
|
|
if (error_sector)
|
|
*error_sector = bio->bi_iter.bi_sector;
|
|
|
|
bio_put(bio);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(blkdev_issue_flush);
|
|
|
|
struct blk_flush_queue *blk_alloc_flush_queue(struct request_queue *q,
|
|
int node, int cmd_size)
|
|
{
|
|
struct blk_flush_queue *fq;
|
|
int rq_sz = sizeof(struct request);
|
|
|
|
fq = kzalloc_node(sizeof(*fq), GFP_KERNEL, node);
|
|
if (!fq)
|
|
goto fail;
|
|
|
|
if (q->mq_ops)
|
|
spin_lock_init(&fq->mq_flush_lock);
|
|
|
|
rq_sz = round_up(rq_sz + cmd_size, cache_line_size());
|
|
fq->flush_rq = kzalloc_node(rq_sz, GFP_KERNEL, node);
|
|
if (!fq->flush_rq)
|
|
goto fail_rq;
|
|
|
|
INIT_LIST_HEAD(&fq->flush_queue[0]);
|
|
INIT_LIST_HEAD(&fq->flush_queue[1]);
|
|
INIT_LIST_HEAD(&fq->flush_data_in_flight);
|
|
|
|
return fq;
|
|
|
|
fail_rq:
|
|
kfree(fq);
|
|
fail:
|
|
return NULL;
|
|
}
|
|
|
|
void blk_free_flush_queue(struct blk_flush_queue *fq)
|
|
{
|
|
/* bio based request queue hasn't flush queue */
|
|
if (!fq)
|
|
return;
|
|
|
|
kfree(fq->flush_rq);
|
|
kfree(fq);
|
|
}
|