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![Bob Liu](/assets/img/avatar_default.png)
The following is a description of a hang in blk_mq_freeze_queue_wait(). The hang happens on attempt to freeze a queue while another task does queue unfreeze. The root cause is an incorrect sequence of percpu_ref_resurrect() and percpu_ref_kill() and as a result those two can be swapped: CPU#0 CPU#1 ---------------- ----------------- q1 = blk_mq_init_queue(shared_tags) q2 = blk_mq_init_queue(shared_tags): blk_mq_add_queue_tag_set(shared_tags): blk_mq_update_tag_set_depth(shared_tags): list_for_each_entry() blk_mq_freeze_queue(q1) > percpu_ref_kill() > blk_mq_freeze_queue_wait() blk_cleanup_queue(q1) blk_mq_freeze_queue(q1) > percpu_ref_kill() ^^^^^^ freeze_depth can't guarantee the order blk_mq_unfreeze_queue() > percpu_ref_resurrect() > blk_mq_freeze_queue_wait() ^^^^^^ Hang here!!!! This wrong sequence raises kernel warning: percpu_ref_kill_and_confirm called more than once on blk_queue_usage_counter_release! WARNING: CPU: 0 PID: 11854 at lib/percpu-refcount.c:336 percpu_ref_kill_and_confirm+0x99/0xb0 But the most unpleasant effect is a hang of a blk_mq_freeze_queue_wait(), which waits for a zero of a q_usage_counter, which never happens because percpu-ref was reinited (instead of being killed) and stays in PERCPU state forever. How to reproduce: - "insmod null_blk.ko shared_tags=1 nr_devices=0 queue_mode=2" - cpu0: python Script.py 0; taskset the corresponding process running on cpu0 - cpu1: python Script.py 1; taskset the corresponding process running on cpu1 Script.py: ------ #!/usr/bin/python3 import os import sys while True: on = "echo 1 > /sys/kernel/config/nullb/%s/power" % sys.argv[1] off = "echo 0 > /sys/kernel/config/nullb/%s/power" % sys.argv[1] os.system(on) os.system(off) ------ This bug was first reported and fixed by Roman, previous discussion: [1] Message id: 1443287365-4244-7-git-send-email-akinobu.mita@gmail.com [2] Message id: 1443563240-29306-6-git-send-email-tj@kernel.org [3] https://patchwork.kernel.org/patch/9268199/ Reviewed-by: Hannes Reinecke <hare@suse.com> Reviewed-by: Ming Lei <ming.lei@redhat.com> Reviewed-by: Bart Van Assche <bvanassche@acm.org> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Roman Pen <roman.penyaev@profitbricks.com> Signed-off-by: Bob Liu <bob.liu@oracle.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
1812 lines
51 KiB
C
1812 lines
51 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_BLKDEV_H
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#define _LINUX_BLKDEV_H
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#include <linux/sched.h>
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#include <linux/sched/clock.h>
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#ifdef CONFIG_BLOCK
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#include <linux/major.h>
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#include <linux/genhd.h>
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#include <linux/list.h>
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#include <linux/llist.h>
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#include <linux/timer.h>
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#include <linux/workqueue.h>
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#include <linux/pagemap.h>
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#include <linux/backing-dev-defs.h>
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#include <linux/wait.h>
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#include <linux/mempool.h>
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#include <linux/pfn.h>
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#include <linux/bio.h>
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#include <linux/stringify.h>
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#include <linux/gfp.h>
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#include <linux/bsg.h>
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#include <linux/smp.h>
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#include <linux/rcupdate.h>
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#include <linux/percpu-refcount.h>
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#include <linux/scatterlist.h>
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#include <linux/blkzoned.h>
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struct module;
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struct scsi_ioctl_command;
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struct request_queue;
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struct elevator_queue;
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struct blk_trace;
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struct request;
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struct sg_io_hdr;
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struct bsg_job;
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struct blkcg_gq;
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struct blk_flush_queue;
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struct pr_ops;
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struct rq_qos;
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struct blk_queue_stats;
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struct blk_stat_callback;
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#define BLKDEV_MIN_RQ 4
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#define BLKDEV_MAX_RQ 128 /* Default maximum */
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/* Must be consistent with blk_mq_poll_stats_bkt() */
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#define BLK_MQ_POLL_STATS_BKTS 16
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/* Doing classic polling */
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#define BLK_MQ_POLL_CLASSIC -1
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/*
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* Maximum number of blkcg policies allowed to be registered concurrently.
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* Defined here to simplify include dependency.
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*/
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#define BLKCG_MAX_POLS 5
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typedef void (rq_end_io_fn)(struct request *, blk_status_t);
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/*
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* request flags */
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typedef __u32 __bitwise req_flags_t;
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/* elevator knows about this request */
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#define RQF_SORTED ((__force req_flags_t)(1 << 0))
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/* drive already may have started this one */
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#define RQF_STARTED ((__force req_flags_t)(1 << 1))
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/* may not be passed by ioscheduler */
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#define RQF_SOFTBARRIER ((__force req_flags_t)(1 << 3))
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/* request for flush sequence */
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#define RQF_FLUSH_SEQ ((__force req_flags_t)(1 << 4))
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/* merge of different types, fail separately */
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#define RQF_MIXED_MERGE ((__force req_flags_t)(1 << 5))
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/* track inflight for MQ */
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#define RQF_MQ_INFLIGHT ((__force req_flags_t)(1 << 6))
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/* don't call prep for this one */
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#define RQF_DONTPREP ((__force req_flags_t)(1 << 7))
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/* set for "ide_preempt" requests and also for requests for which the SCSI
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"quiesce" state must be ignored. */
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#define RQF_PREEMPT ((__force req_flags_t)(1 << 8))
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/* contains copies of user pages */
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#define RQF_COPY_USER ((__force req_flags_t)(1 << 9))
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/* vaguely specified driver internal error. Ignored by the block layer */
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#define RQF_FAILED ((__force req_flags_t)(1 << 10))
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/* don't warn about errors */
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#define RQF_QUIET ((__force req_flags_t)(1 << 11))
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/* elevator private data attached */
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#define RQF_ELVPRIV ((__force req_flags_t)(1 << 12))
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/* account into disk and partition IO statistics */
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#define RQF_IO_STAT ((__force req_flags_t)(1 << 13))
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/* request came from our alloc pool */
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#define RQF_ALLOCED ((__force req_flags_t)(1 << 14))
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/* runtime pm request */
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#define RQF_PM ((__force req_flags_t)(1 << 15))
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/* on IO scheduler merge hash */
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#define RQF_HASHED ((__force req_flags_t)(1 << 16))
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/* track IO completion time */
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#define RQF_STATS ((__force req_flags_t)(1 << 17))
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/* Look at ->special_vec for the actual data payload instead of the
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bio chain. */
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#define RQF_SPECIAL_PAYLOAD ((__force req_flags_t)(1 << 18))
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/* The per-zone write lock is held for this request */
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#define RQF_ZONE_WRITE_LOCKED ((__force req_flags_t)(1 << 19))
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/* already slept for hybrid poll */
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#define RQF_MQ_POLL_SLEPT ((__force req_flags_t)(1 << 20))
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/* ->timeout has been called, don't expire again */
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#define RQF_TIMED_OUT ((__force req_flags_t)(1 << 21))
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/* flags that prevent us from merging requests: */
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#define RQF_NOMERGE_FLAGS \
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(RQF_STARTED | RQF_SOFTBARRIER | RQF_FLUSH_SEQ | RQF_SPECIAL_PAYLOAD)
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/*
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* Request state for blk-mq.
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*/
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enum mq_rq_state {
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MQ_RQ_IDLE = 0,
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MQ_RQ_IN_FLIGHT = 1,
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MQ_RQ_COMPLETE = 2,
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};
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/*
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* Try to put the fields that are referenced together in the same cacheline.
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*
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* If you modify this structure, make sure to update blk_rq_init() and
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* especially blk_mq_rq_ctx_init() to take care of the added fields.
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*/
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struct request {
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struct request_queue *q;
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struct blk_mq_ctx *mq_ctx;
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struct blk_mq_hw_ctx *mq_hctx;
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unsigned int cmd_flags; /* op and common flags */
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req_flags_t rq_flags;
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int internal_tag;
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/* the following two fields are internal, NEVER access directly */
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unsigned int __data_len; /* total data len */
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int tag;
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sector_t __sector; /* sector cursor */
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struct bio *bio;
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struct bio *biotail;
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struct list_head queuelist;
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/*
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* The hash is used inside the scheduler, and killed once the
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* request reaches the dispatch list. The ipi_list is only used
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* to queue the request for softirq completion, which is long
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* after the request has been unhashed (and even removed from
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* the dispatch list).
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*/
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union {
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struct hlist_node hash; /* merge hash */
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struct list_head ipi_list;
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};
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/*
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* The rb_node is only used inside the io scheduler, requests
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* are pruned when moved to the dispatch queue. So let the
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* completion_data share space with the rb_node.
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*/
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union {
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struct rb_node rb_node; /* sort/lookup */
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struct bio_vec special_vec;
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void *completion_data;
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int error_count; /* for legacy drivers, don't use */
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};
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/*
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* Three pointers are available for the IO schedulers, if they need
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* more they have to dynamically allocate it. Flush requests are
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* never put on the IO scheduler. So let the flush fields share
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* space with the elevator data.
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*/
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union {
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struct {
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struct io_cq *icq;
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void *priv[2];
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} elv;
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struct {
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unsigned int seq;
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struct list_head list;
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rq_end_io_fn *saved_end_io;
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} flush;
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};
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struct gendisk *rq_disk;
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struct hd_struct *part;
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/* Time that I/O was submitted to the kernel. */
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u64 start_time_ns;
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/* Time that I/O was submitted to the device. */
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u64 io_start_time_ns;
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#ifdef CONFIG_BLK_WBT
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unsigned short wbt_flags;
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#endif
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#ifdef CONFIG_BLK_DEV_THROTTLING_LOW
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unsigned short throtl_size;
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#endif
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/*
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* Number of scatter-gather DMA addr+len pairs after
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* physical address coalescing is performed.
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*/
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unsigned short nr_phys_segments;
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#if defined(CONFIG_BLK_DEV_INTEGRITY)
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unsigned short nr_integrity_segments;
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#endif
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unsigned short write_hint;
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unsigned short ioprio;
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unsigned int extra_len; /* length of alignment and padding */
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enum mq_rq_state state;
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refcount_t ref;
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unsigned int timeout;
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unsigned long deadline;
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union {
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struct __call_single_data csd;
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u64 fifo_time;
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};
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/*
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* completion callback.
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*/
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rq_end_io_fn *end_io;
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void *end_io_data;
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};
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static inline bool blk_op_is_scsi(unsigned int op)
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{
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return op == REQ_OP_SCSI_IN || op == REQ_OP_SCSI_OUT;
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}
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static inline bool blk_op_is_private(unsigned int op)
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{
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return op == REQ_OP_DRV_IN || op == REQ_OP_DRV_OUT;
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}
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static inline bool blk_rq_is_scsi(struct request *rq)
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{
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return blk_op_is_scsi(req_op(rq));
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}
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static inline bool blk_rq_is_private(struct request *rq)
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{
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return blk_op_is_private(req_op(rq));
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}
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static inline bool blk_rq_is_passthrough(struct request *rq)
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{
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return blk_rq_is_scsi(rq) || blk_rq_is_private(rq);
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}
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static inline bool bio_is_passthrough(struct bio *bio)
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{
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unsigned op = bio_op(bio);
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return blk_op_is_scsi(op) || blk_op_is_private(op);
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}
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static inline unsigned short req_get_ioprio(struct request *req)
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{
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return req->ioprio;
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}
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#include <linux/elevator.h>
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struct blk_queue_ctx;
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typedef blk_qc_t (make_request_fn) (struct request_queue *q, struct bio *bio);
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struct bio_vec;
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typedef int (dma_drain_needed_fn)(struct request *);
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enum blk_eh_timer_return {
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BLK_EH_DONE, /* drivers has completed the command */
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BLK_EH_RESET_TIMER, /* reset timer and try again */
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};
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enum blk_queue_state {
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Queue_down,
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Queue_up,
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};
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#define BLK_TAG_ALLOC_FIFO 0 /* allocate starting from 0 */
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#define BLK_TAG_ALLOC_RR 1 /* allocate starting from last allocated tag */
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#define BLK_SCSI_MAX_CMDS (256)
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#define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8))
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/*
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* Zoned block device models (zoned limit).
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*/
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enum blk_zoned_model {
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BLK_ZONED_NONE, /* Regular block device */
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BLK_ZONED_HA, /* Host-aware zoned block device */
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BLK_ZONED_HM, /* Host-managed zoned block device */
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};
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struct queue_limits {
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unsigned long bounce_pfn;
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unsigned long seg_boundary_mask;
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unsigned long virt_boundary_mask;
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unsigned int max_hw_sectors;
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unsigned int max_dev_sectors;
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unsigned int chunk_sectors;
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unsigned int max_sectors;
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unsigned int max_segment_size;
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unsigned int physical_block_size;
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unsigned int alignment_offset;
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unsigned int io_min;
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unsigned int io_opt;
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unsigned int max_discard_sectors;
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unsigned int max_hw_discard_sectors;
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unsigned int max_write_same_sectors;
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unsigned int max_write_zeroes_sectors;
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unsigned int discard_granularity;
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unsigned int discard_alignment;
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unsigned short logical_block_size;
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unsigned short max_segments;
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unsigned short max_integrity_segments;
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unsigned short max_discard_segments;
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unsigned char misaligned;
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unsigned char discard_misaligned;
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unsigned char raid_partial_stripes_expensive;
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enum blk_zoned_model zoned;
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};
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#ifdef CONFIG_BLK_DEV_ZONED
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extern unsigned int blkdev_nr_zones(struct block_device *bdev);
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extern int blkdev_report_zones(struct block_device *bdev,
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sector_t sector, struct blk_zone *zones,
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unsigned int *nr_zones, gfp_t gfp_mask);
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extern int blkdev_reset_zones(struct block_device *bdev, sector_t sectors,
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sector_t nr_sectors, gfp_t gfp_mask);
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extern int blk_revalidate_disk_zones(struct gendisk *disk);
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extern int blkdev_report_zones_ioctl(struct block_device *bdev, fmode_t mode,
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unsigned int cmd, unsigned long arg);
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extern int blkdev_reset_zones_ioctl(struct block_device *bdev, fmode_t mode,
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unsigned int cmd, unsigned long arg);
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#else /* CONFIG_BLK_DEV_ZONED */
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static inline unsigned int blkdev_nr_zones(struct block_device *bdev)
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{
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return 0;
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}
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static inline int blk_revalidate_disk_zones(struct gendisk *disk)
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{
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return 0;
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}
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static inline int blkdev_report_zones_ioctl(struct block_device *bdev,
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fmode_t mode, unsigned int cmd,
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unsigned long arg)
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{
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return -ENOTTY;
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}
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static inline int blkdev_reset_zones_ioctl(struct block_device *bdev,
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fmode_t mode, unsigned int cmd,
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unsigned long arg)
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{
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return -ENOTTY;
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}
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#endif /* CONFIG_BLK_DEV_ZONED */
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struct request_queue {
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/*
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* Together with queue_head for cacheline sharing
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*/
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struct list_head queue_head;
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struct request *last_merge;
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struct elevator_queue *elevator;
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struct blk_queue_stats *stats;
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struct rq_qos *rq_qos;
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make_request_fn *make_request_fn;
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dma_drain_needed_fn *dma_drain_needed;
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const struct blk_mq_ops *mq_ops;
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/* sw queues */
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struct blk_mq_ctx __percpu *queue_ctx;
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unsigned int nr_queues;
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unsigned int queue_depth;
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/* hw dispatch queues */
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struct blk_mq_hw_ctx **queue_hw_ctx;
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unsigned int nr_hw_queues;
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struct backing_dev_info *backing_dev_info;
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/*
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* The queue owner gets to use this for whatever they like.
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* ll_rw_blk doesn't touch it.
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*/
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void *queuedata;
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/*
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* various queue flags, see QUEUE_* below
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*/
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unsigned long queue_flags;
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/*
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* Number of contexts that have called blk_set_pm_only(). If this
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* counter is above zero then only RQF_PM and RQF_PREEMPT requests are
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* processed.
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*/
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atomic_t pm_only;
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/*
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* ida allocated id for this queue. Used to index queues from
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* ioctx.
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*/
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int id;
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/*
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* queue needs bounce pages for pages above this limit
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*/
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gfp_t bounce_gfp;
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spinlock_t queue_lock;
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/*
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* queue kobject
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*/
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struct kobject kobj;
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/*
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* mq queue kobject
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*/
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struct kobject *mq_kobj;
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#ifdef CONFIG_BLK_DEV_INTEGRITY
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struct blk_integrity integrity;
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#endif /* CONFIG_BLK_DEV_INTEGRITY */
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#ifdef CONFIG_PM
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struct device *dev;
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int rpm_status;
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unsigned int nr_pending;
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#endif
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/*
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* queue settings
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*/
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unsigned long nr_requests; /* Max # of requests */
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unsigned int dma_drain_size;
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void *dma_drain_buffer;
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unsigned int dma_pad_mask;
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unsigned int dma_alignment;
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|
|
unsigned int rq_timeout;
|
|
int poll_nsec;
|
|
|
|
struct blk_stat_callback *poll_cb;
|
|
struct blk_rq_stat poll_stat[BLK_MQ_POLL_STATS_BKTS];
|
|
|
|
struct timer_list timeout;
|
|
struct work_struct timeout_work;
|
|
|
|
struct list_head icq_list;
|
|
#ifdef CONFIG_BLK_CGROUP
|
|
DECLARE_BITMAP (blkcg_pols, BLKCG_MAX_POLS);
|
|
struct blkcg_gq *root_blkg;
|
|
struct list_head blkg_list;
|
|
#endif
|
|
|
|
struct queue_limits limits;
|
|
|
|
#ifdef CONFIG_BLK_DEV_ZONED
|
|
/*
|
|
* Zoned block device information for request dispatch control.
|
|
* nr_zones is the total number of zones of the device. This is always
|
|
* 0 for regular block devices. seq_zones_bitmap is a bitmap of nr_zones
|
|
* bits which indicates if a zone is conventional (bit clear) or
|
|
* sequential (bit set). seq_zones_wlock is a bitmap of nr_zones
|
|
* bits which indicates if a zone is write locked, that is, if a write
|
|
* request targeting the zone was dispatched. All three fields are
|
|
* initialized by the low level device driver (e.g. scsi/sd.c).
|
|
* Stacking drivers (device mappers) may or may not initialize
|
|
* these fields.
|
|
*
|
|
* Reads of this information must be protected with blk_queue_enter() /
|
|
* blk_queue_exit(). Modifying this information is only allowed while
|
|
* no requests are being processed. See also blk_mq_freeze_queue() and
|
|
* blk_mq_unfreeze_queue().
|
|
*/
|
|
unsigned int nr_zones;
|
|
unsigned long *seq_zones_bitmap;
|
|
unsigned long *seq_zones_wlock;
|
|
#endif /* CONFIG_BLK_DEV_ZONED */
|
|
|
|
/*
|
|
* sg stuff
|
|
*/
|
|
unsigned int sg_timeout;
|
|
unsigned int sg_reserved_size;
|
|
int node;
|
|
#ifdef CONFIG_BLK_DEV_IO_TRACE
|
|
struct blk_trace *blk_trace;
|
|
struct mutex blk_trace_mutex;
|
|
#endif
|
|
/*
|
|
* for flush operations
|
|
*/
|
|
struct blk_flush_queue *fq;
|
|
|
|
struct list_head requeue_list;
|
|
spinlock_t requeue_lock;
|
|
struct delayed_work requeue_work;
|
|
|
|
struct mutex sysfs_lock;
|
|
|
|
/*
|
|
* for reusing dead hctx instance in case of updating
|
|
* nr_hw_queues
|
|
*/
|
|
struct list_head unused_hctx_list;
|
|
spinlock_t unused_hctx_lock;
|
|
|
|
int mq_freeze_depth;
|
|
|
|
#if defined(CONFIG_BLK_DEV_BSG)
|
|
struct bsg_class_device bsg_dev;
|
|
#endif
|
|
|
|
#ifdef CONFIG_BLK_DEV_THROTTLING
|
|
/* Throttle data */
|
|
struct throtl_data *td;
|
|
#endif
|
|
struct rcu_head rcu_head;
|
|
wait_queue_head_t mq_freeze_wq;
|
|
/*
|
|
* Protect concurrent access to q_usage_counter by
|
|
* percpu_ref_kill() and percpu_ref_reinit().
|
|
*/
|
|
struct mutex mq_freeze_lock;
|
|
struct percpu_ref q_usage_counter;
|
|
|
|
struct blk_mq_tag_set *tag_set;
|
|
struct list_head tag_set_list;
|
|
struct bio_set bio_split;
|
|
|
|
#ifdef CONFIG_BLK_DEBUG_FS
|
|
struct dentry *debugfs_dir;
|
|
struct dentry *sched_debugfs_dir;
|
|
struct dentry *rqos_debugfs_dir;
|
|
#endif
|
|
|
|
bool mq_sysfs_init_done;
|
|
|
|
size_t cmd_size;
|
|
|
|
struct work_struct release_work;
|
|
|
|
#define BLK_MAX_WRITE_HINTS 5
|
|
u64 write_hints[BLK_MAX_WRITE_HINTS];
|
|
};
|
|
|
|
#define QUEUE_FLAG_STOPPED 0 /* queue is stopped */
|
|
#define QUEUE_FLAG_DYING 1 /* queue being torn down */
|
|
#define QUEUE_FLAG_NOMERGES 3 /* disable merge attempts */
|
|
#define QUEUE_FLAG_SAME_COMP 4 /* complete on same CPU-group */
|
|
#define QUEUE_FLAG_FAIL_IO 5 /* fake timeout */
|
|
#define QUEUE_FLAG_NONROT 6 /* non-rotational device (SSD) */
|
|
#define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */
|
|
#define QUEUE_FLAG_IO_STAT 7 /* do disk/partitions IO accounting */
|
|
#define QUEUE_FLAG_DISCARD 8 /* supports DISCARD */
|
|
#define QUEUE_FLAG_NOXMERGES 9 /* No extended merges */
|
|
#define QUEUE_FLAG_ADD_RANDOM 10 /* Contributes to random pool */
|
|
#define QUEUE_FLAG_SECERASE 11 /* supports secure erase */
|
|
#define QUEUE_FLAG_SAME_FORCE 12 /* force complete on same CPU */
|
|
#define QUEUE_FLAG_DEAD 13 /* queue tear-down finished */
|
|
#define QUEUE_FLAG_INIT_DONE 14 /* queue is initialized */
|
|
#define QUEUE_FLAG_POLL 16 /* IO polling enabled if set */
|
|
#define QUEUE_FLAG_WC 17 /* Write back caching */
|
|
#define QUEUE_FLAG_FUA 18 /* device supports FUA writes */
|
|
#define QUEUE_FLAG_DAX 19 /* device supports DAX */
|
|
#define QUEUE_FLAG_STATS 20 /* track IO start and completion times */
|
|
#define QUEUE_FLAG_POLL_STATS 21 /* collecting stats for hybrid polling */
|
|
#define QUEUE_FLAG_REGISTERED 22 /* queue has been registered to a disk */
|
|
#define QUEUE_FLAG_SCSI_PASSTHROUGH 23 /* queue supports SCSI commands */
|
|
#define QUEUE_FLAG_QUIESCED 24 /* queue has been quiesced */
|
|
#define QUEUE_FLAG_PCI_P2PDMA 25 /* device supports PCI p2p requests */
|
|
|
|
#define QUEUE_FLAG_MQ_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \
|
|
(1 << QUEUE_FLAG_SAME_COMP))
|
|
|
|
void blk_queue_flag_set(unsigned int flag, struct request_queue *q);
|
|
void blk_queue_flag_clear(unsigned int flag, struct request_queue *q);
|
|
bool blk_queue_flag_test_and_set(unsigned int flag, struct request_queue *q);
|
|
|
|
#define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags)
|
|
#define blk_queue_dying(q) test_bit(QUEUE_FLAG_DYING, &(q)->queue_flags)
|
|
#define blk_queue_dead(q) test_bit(QUEUE_FLAG_DEAD, &(q)->queue_flags)
|
|
#define blk_queue_init_done(q) test_bit(QUEUE_FLAG_INIT_DONE, &(q)->queue_flags)
|
|
#define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags)
|
|
#define blk_queue_noxmerges(q) \
|
|
test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags)
|
|
#define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags)
|
|
#define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags)
|
|
#define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags)
|
|
#define blk_queue_discard(q) test_bit(QUEUE_FLAG_DISCARD, &(q)->queue_flags)
|
|
#define blk_queue_secure_erase(q) \
|
|
(test_bit(QUEUE_FLAG_SECERASE, &(q)->queue_flags))
|
|
#define blk_queue_dax(q) test_bit(QUEUE_FLAG_DAX, &(q)->queue_flags)
|
|
#define blk_queue_scsi_passthrough(q) \
|
|
test_bit(QUEUE_FLAG_SCSI_PASSTHROUGH, &(q)->queue_flags)
|
|
#define blk_queue_pci_p2pdma(q) \
|
|
test_bit(QUEUE_FLAG_PCI_P2PDMA, &(q)->queue_flags)
|
|
|
|
#define blk_noretry_request(rq) \
|
|
((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \
|
|
REQ_FAILFAST_DRIVER))
|
|
#define blk_queue_quiesced(q) test_bit(QUEUE_FLAG_QUIESCED, &(q)->queue_flags)
|
|
#define blk_queue_pm_only(q) atomic_read(&(q)->pm_only)
|
|
#define blk_queue_fua(q) test_bit(QUEUE_FLAG_FUA, &(q)->queue_flags)
|
|
|
|
extern void blk_set_pm_only(struct request_queue *q);
|
|
extern void blk_clear_pm_only(struct request_queue *q);
|
|
|
|
static inline bool blk_account_rq(struct request *rq)
|
|
{
|
|
return (rq->rq_flags & RQF_STARTED) && !blk_rq_is_passthrough(rq);
|
|
}
|
|
|
|
#define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist)
|
|
|
|
#define rq_data_dir(rq) (op_is_write(req_op(rq)) ? WRITE : READ)
|
|
|
|
#define rq_dma_dir(rq) \
|
|
(op_is_write(req_op(rq)) ? DMA_TO_DEVICE : DMA_FROM_DEVICE)
|
|
|
|
#define dma_map_bvec(dev, bv, dir, attrs) \
|
|
dma_map_page_attrs(dev, (bv)->bv_page, (bv)->bv_offset, (bv)->bv_len, \
|
|
(dir), (attrs))
|
|
|
|
static inline bool queue_is_mq(struct request_queue *q)
|
|
{
|
|
return q->mq_ops;
|
|
}
|
|
|
|
static inline enum blk_zoned_model
|
|
blk_queue_zoned_model(struct request_queue *q)
|
|
{
|
|
return q->limits.zoned;
|
|
}
|
|
|
|
static inline bool blk_queue_is_zoned(struct request_queue *q)
|
|
{
|
|
switch (blk_queue_zoned_model(q)) {
|
|
case BLK_ZONED_HA:
|
|
case BLK_ZONED_HM:
|
|
return true;
|
|
default:
|
|
return false;
|
|
}
|
|
}
|
|
|
|
static inline unsigned int blk_queue_zone_sectors(struct request_queue *q)
|
|
{
|
|
return blk_queue_is_zoned(q) ? q->limits.chunk_sectors : 0;
|
|
}
|
|
|
|
#ifdef CONFIG_BLK_DEV_ZONED
|
|
static inline unsigned int blk_queue_nr_zones(struct request_queue *q)
|
|
{
|
|
return blk_queue_is_zoned(q) ? q->nr_zones : 0;
|
|
}
|
|
|
|
static inline unsigned int blk_queue_zone_no(struct request_queue *q,
|
|
sector_t sector)
|
|
{
|
|
if (!blk_queue_is_zoned(q))
|
|
return 0;
|
|
return sector >> ilog2(q->limits.chunk_sectors);
|
|
}
|
|
|
|
static inline bool blk_queue_zone_is_seq(struct request_queue *q,
|
|
sector_t sector)
|
|
{
|
|
if (!blk_queue_is_zoned(q) || !q->seq_zones_bitmap)
|
|
return false;
|
|
return test_bit(blk_queue_zone_no(q, sector), q->seq_zones_bitmap);
|
|
}
|
|
#else /* CONFIG_BLK_DEV_ZONED */
|
|
static inline unsigned int blk_queue_nr_zones(struct request_queue *q)
|
|
{
|
|
return 0;
|
|
}
|
|
#endif /* CONFIG_BLK_DEV_ZONED */
|
|
|
|
static inline bool rq_is_sync(struct request *rq)
|
|
{
|
|
return op_is_sync(rq->cmd_flags);
|
|
}
|
|
|
|
static inline bool rq_mergeable(struct request *rq)
|
|
{
|
|
if (blk_rq_is_passthrough(rq))
|
|
return false;
|
|
|
|
if (req_op(rq) == REQ_OP_FLUSH)
|
|
return false;
|
|
|
|
if (req_op(rq) == REQ_OP_WRITE_ZEROES)
|
|
return false;
|
|
|
|
if (rq->cmd_flags & REQ_NOMERGE_FLAGS)
|
|
return false;
|
|
if (rq->rq_flags & RQF_NOMERGE_FLAGS)
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
static inline bool blk_write_same_mergeable(struct bio *a, struct bio *b)
|
|
{
|
|
if (bio_page(a) == bio_page(b) &&
|
|
bio_offset(a) == bio_offset(b))
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
static inline unsigned int blk_queue_depth(struct request_queue *q)
|
|
{
|
|
if (q->queue_depth)
|
|
return q->queue_depth;
|
|
|
|
return q->nr_requests;
|
|
}
|
|
|
|
extern unsigned long blk_max_low_pfn, blk_max_pfn;
|
|
|
|
/*
|
|
* standard bounce addresses:
|
|
*
|
|
* BLK_BOUNCE_HIGH : bounce all highmem pages
|
|
* BLK_BOUNCE_ANY : don't bounce anything
|
|
* BLK_BOUNCE_ISA : bounce pages above ISA DMA boundary
|
|
*/
|
|
|
|
#if BITS_PER_LONG == 32
|
|
#define BLK_BOUNCE_HIGH ((u64)blk_max_low_pfn << PAGE_SHIFT)
|
|
#else
|
|
#define BLK_BOUNCE_HIGH -1ULL
|
|
#endif
|
|
#define BLK_BOUNCE_ANY (-1ULL)
|
|
#define BLK_BOUNCE_ISA (DMA_BIT_MASK(24))
|
|
|
|
/*
|
|
* default timeout for SG_IO if none specified
|
|
*/
|
|
#define BLK_DEFAULT_SG_TIMEOUT (60 * HZ)
|
|
#define BLK_MIN_SG_TIMEOUT (7 * HZ)
|
|
|
|
struct rq_map_data {
|
|
struct page **pages;
|
|
int page_order;
|
|
int nr_entries;
|
|
unsigned long offset;
|
|
int null_mapped;
|
|
int from_user;
|
|
};
|
|
|
|
struct req_iterator {
|
|
struct bvec_iter iter;
|
|
struct bio *bio;
|
|
};
|
|
|
|
/* This should not be used directly - use rq_for_each_segment */
|
|
#define for_each_bio(_bio) \
|
|
for (; _bio; _bio = _bio->bi_next)
|
|
#define __rq_for_each_bio(_bio, rq) \
|
|
if ((rq->bio)) \
|
|
for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next)
|
|
|
|
#define rq_for_each_segment(bvl, _rq, _iter) \
|
|
__rq_for_each_bio(_iter.bio, _rq) \
|
|
bio_for_each_segment(bvl, _iter.bio, _iter.iter)
|
|
|
|
#define rq_for_each_bvec(bvl, _rq, _iter) \
|
|
__rq_for_each_bio(_iter.bio, _rq) \
|
|
bio_for_each_bvec(bvl, _iter.bio, _iter.iter)
|
|
|
|
#define rq_iter_last(bvec, _iter) \
|
|
(_iter.bio->bi_next == NULL && \
|
|
bio_iter_last(bvec, _iter.iter))
|
|
|
|
#ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
|
|
# error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform"
|
|
#endif
|
|
#if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
|
|
extern void rq_flush_dcache_pages(struct request *rq);
|
|
#else
|
|
static inline void rq_flush_dcache_pages(struct request *rq)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
extern int blk_register_queue(struct gendisk *disk);
|
|
extern void blk_unregister_queue(struct gendisk *disk);
|
|
extern blk_qc_t generic_make_request(struct bio *bio);
|
|
extern blk_qc_t direct_make_request(struct bio *bio);
|
|
extern void blk_rq_init(struct request_queue *q, struct request *rq);
|
|
extern void blk_init_request_from_bio(struct request *req, struct bio *bio);
|
|
extern void blk_put_request(struct request *);
|
|
extern struct request *blk_get_request(struct request_queue *, unsigned int op,
|
|
blk_mq_req_flags_t flags);
|
|
extern int blk_lld_busy(struct request_queue *q);
|
|
extern int blk_rq_prep_clone(struct request *rq, struct request *rq_src,
|
|
struct bio_set *bs, gfp_t gfp_mask,
|
|
int (*bio_ctr)(struct bio *, struct bio *, void *),
|
|
void *data);
|
|
extern void blk_rq_unprep_clone(struct request *rq);
|
|
extern blk_status_t blk_insert_cloned_request(struct request_queue *q,
|
|
struct request *rq);
|
|
extern int blk_rq_append_bio(struct request *rq, struct bio **bio);
|
|
extern void blk_queue_split(struct request_queue *, struct bio **);
|
|
extern void blk_recount_segments(struct request_queue *, struct bio *);
|
|
extern int scsi_verify_blk_ioctl(struct block_device *, unsigned int);
|
|
extern int scsi_cmd_blk_ioctl(struct block_device *, fmode_t,
|
|
unsigned int, void __user *);
|
|
extern int scsi_cmd_ioctl(struct request_queue *, struct gendisk *, fmode_t,
|
|
unsigned int, void __user *);
|
|
extern int sg_scsi_ioctl(struct request_queue *, struct gendisk *, fmode_t,
|
|
struct scsi_ioctl_command __user *);
|
|
|
|
extern int blk_queue_enter(struct request_queue *q, blk_mq_req_flags_t flags);
|
|
extern void blk_queue_exit(struct request_queue *q);
|
|
extern void blk_sync_queue(struct request_queue *q);
|
|
extern int blk_rq_map_user(struct request_queue *, struct request *,
|
|
struct rq_map_data *, void __user *, unsigned long,
|
|
gfp_t);
|
|
extern int blk_rq_unmap_user(struct bio *);
|
|
extern int blk_rq_map_kern(struct request_queue *, struct request *, void *, unsigned int, gfp_t);
|
|
extern int blk_rq_map_user_iov(struct request_queue *, struct request *,
|
|
struct rq_map_data *, const struct iov_iter *,
|
|
gfp_t);
|
|
extern void blk_execute_rq(struct request_queue *, struct gendisk *,
|
|
struct request *, int);
|
|
extern void blk_execute_rq_nowait(struct request_queue *, struct gendisk *,
|
|
struct request *, int, rq_end_io_fn *);
|
|
|
|
int blk_status_to_errno(blk_status_t status);
|
|
blk_status_t errno_to_blk_status(int errno);
|
|
|
|
int blk_poll(struct request_queue *q, blk_qc_t cookie, bool spin);
|
|
|
|
static inline struct request_queue *bdev_get_queue(struct block_device *bdev)
|
|
{
|
|
return bdev->bd_disk->queue; /* this is never NULL */
|
|
}
|
|
|
|
/*
|
|
* The basic unit of block I/O is a sector. It is used in a number of contexts
|
|
* in Linux (blk, bio, genhd). The size of one sector is 512 = 2**9
|
|
* bytes. Variables of type sector_t represent an offset or size that is a
|
|
* multiple of 512 bytes. Hence these two constants.
|
|
*/
|
|
#ifndef SECTOR_SHIFT
|
|
#define SECTOR_SHIFT 9
|
|
#endif
|
|
#ifndef SECTOR_SIZE
|
|
#define SECTOR_SIZE (1 << SECTOR_SHIFT)
|
|
#endif
|
|
|
|
/*
|
|
* blk_rq_pos() : the current sector
|
|
* blk_rq_bytes() : bytes left in the entire request
|
|
* blk_rq_cur_bytes() : bytes left in the current segment
|
|
* blk_rq_err_bytes() : bytes left till the next error boundary
|
|
* blk_rq_sectors() : sectors left in the entire request
|
|
* blk_rq_cur_sectors() : sectors left in the current segment
|
|
*/
|
|
static inline sector_t blk_rq_pos(const struct request *rq)
|
|
{
|
|
return rq->__sector;
|
|
}
|
|
|
|
static inline unsigned int blk_rq_bytes(const struct request *rq)
|
|
{
|
|
return rq->__data_len;
|
|
}
|
|
|
|
static inline int blk_rq_cur_bytes(const struct request *rq)
|
|
{
|
|
return rq->bio ? bio_cur_bytes(rq->bio) : 0;
|
|
}
|
|
|
|
extern unsigned int blk_rq_err_bytes(const struct request *rq);
|
|
|
|
static inline unsigned int blk_rq_sectors(const struct request *rq)
|
|
{
|
|
return blk_rq_bytes(rq) >> SECTOR_SHIFT;
|
|
}
|
|
|
|
static inline unsigned int blk_rq_cur_sectors(const struct request *rq)
|
|
{
|
|
return blk_rq_cur_bytes(rq) >> SECTOR_SHIFT;
|
|
}
|
|
|
|
#ifdef CONFIG_BLK_DEV_ZONED
|
|
static inline unsigned int blk_rq_zone_no(struct request *rq)
|
|
{
|
|
return blk_queue_zone_no(rq->q, blk_rq_pos(rq));
|
|
}
|
|
|
|
static inline unsigned int blk_rq_zone_is_seq(struct request *rq)
|
|
{
|
|
return blk_queue_zone_is_seq(rq->q, blk_rq_pos(rq));
|
|
}
|
|
#endif /* CONFIG_BLK_DEV_ZONED */
|
|
|
|
/*
|
|
* Some commands like WRITE SAME have a payload or data transfer size which
|
|
* is different from the size of the request. Any driver that supports such
|
|
* commands using the RQF_SPECIAL_PAYLOAD flag needs to use this helper to
|
|
* calculate the data transfer size.
|
|
*/
|
|
static inline unsigned int blk_rq_payload_bytes(struct request *rq)
|
|
{
|
|
if (rq->rq_flags & RQF_SPECIAL_PAYLOAD)
|
|
return rq->special_vec.bv_len;
|
|
return blk_rq_bytes(rq);
|
|
}
|
|
|
|
/*
|
|
* Return the first full biovec in the request. The caller needs to check that
|
|
* there are any bvecs before calling this helper.
|
|
*/
|
|
static inline struct bio_vec req_bvec(struct request *rq)
|
|
{
|
|
if (rq->rq_flags & RQF_SPECIAL_PAYLOAD)
|
|
return rq->special_vec;
|
|
return mp_bvec_iter_bvec(rq->bio->bi_io_vec, rq->bio->bi_iter);
|
|
}
|
|
|
|
static inline unsigned int blk_queue_get_max_sectors(struct request_queue *q,
|
|
int op)
|
|
{
|
|
if (unlikely(op == REQ_OP_DISCARD || op == REQ_OP_SECURE_ERASE))
|
|
return min(q->limits.max_discard_sectors,
|
|
UINT_MAX >> SECTOR_SHIFT);
|
|
|
|
if (unlikely(op == REQ_OP_WRITE_SAME))
|
|
return q->limits.max_write_same_sectors;
|
|
|
|
if (unlikely(op == REQ_OP_WRITE_ZEROES))
|
|
return q->limits.max_write_zeroes_sectors;
|
|
|
|
return q->limits.max_sectors;
|
|
}
|
|
|
|
/*
|
|
* Return maximum size of a request at given offset. Only valid for
|
|
* file system requests.
|
|
*/
|
|
static inline unsigned int blk_max_size_offset(struct request_queue *q,
|
|
sector_t offset)
|
|
{
|
|
if (!q->limits.chunk_sectors)
|
|
return q->limits.max_sectors;
|
|
|
|
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,
|
|
sector_t offset)
|
|
{
|
|
struct request_queue *q = rq->q;
|
|
|
|
if (blk_rq_is_passthrough(rq))
|
|
return q->limits.max_hw_sectors;
|
|
|
|
if (!q->limits.chunk_sectors ||
|
|
req_op(rq) == REQ_OP_DISCARD ||
|
|
req_op(rq) == REQ_OP_SECURE_ERASE)
|
|
return blk_queue_get_max_sectors(q, req_op(rq));
|
|
|
|
return min(blk_max_size_offset(q, offset),
|
|
blk_queue_get_max_sectors(q, req_op(rq)));
|
|
}
|
|
|
|
static inline unsigned int blk_rq_count_bios(struct request *rq)
|
|
{
|
|
unsigned int nr_bios = 0;
|
|
struct bio *bio;
|
|
|
|
__rq_for_each_bio(bio, rq)
|
|
nr_bios++;
|
|
|
|
return nr_bios;
|
|
}
|
|
|
|
void blk_steal_bios(struct bio_list *list, struct request *rq);
|
|
|
|
/*
|
|
* Request completion related functions.
|
|
*
|
|
* blk_update_request() completes given number of bytes and updates
|
|
* the request without completing it.
|
|
*
|
|
* blk_end_request() and friends. __blk_end_request() must be called
|
|
* with the request queue spinlock acquired.
|
|
*
|
|
* Several drivers define their own end_request and call
|
|
* blk_end_request() for parts of the original function.
|
|
* This prevents code duplication in drivers.
|
|
*/
|
|
extern bool blk_update_request(struct request *rq, blk_status_t error,
|
|
unsigned int nr_bytes);
|
|
extern void blk_end_request_all(struct request *rq, blk_status_t error);
|
|
extern bool __blk_end_request(struct request *rq, blk_status_t error,
|
|
unsigned int nr_bytes);
|
|
extern void __blk_end_request_all(struct request *rq, blk_status_t error);
|
|
extern bool __blk_end_request_cur(struct request *rq, blk_status_t error);
|
|
|
|
extern void __blk_complete_request(struct request *);
|
|
extern void blk_abort_request(struct request *);
|
|
|
|
/*
|
|
* Access functions for manipulating queue properties
|
|
*/
|
|
extern void blk_cleanup_queue(struct request_queue *);
|
|
extern void blk_queue_make_request(struct request_queue *, make_request_fn *);
|
|
extern void blk_queue_bounce_limit(struct request_queue *, u64);
|
|
extern void blk_queue_max_hw_sectors(struct request_queue *, unsigned int);
|
|
extern void blk_queue_chunk_sectors(struct request_queue *, unsigned int);
|
|
extern void blk_queue_max_segments(struct request_queue *, unsigned short);
|
|
extern void blk_queue_max_discard_segments(struct request_queue *,
|
|
unsigned short);
|
|
extern void blk_queue_max_segment_size(struct request_queue *, unsigned int);
|
|
extern void blk_queue_max_discard_sectors(struct request_queue *q,
|
|
unsigned int max_discard_sectors);
|
|
extern void blk_queue_max_write_same_sectors(struct request_queue *q,
|
|
unsigned int max_write_same_sectors);
|
|
extern void blk_queue_max_write_zeroes_sectors(struct request_queue *q,
|
|
unsigned int max_write_same_sectors);
|
|
extern void blk_queue_logical_block_size(struct request_queue *, unsigned short);
|
|
extern void blk_queue_physical_block_size(struct request_queue *, unsigned int);
|
|
extern void blk_queue_alignment_offset(struct request_queue *q,
|
|
unsigned int alignment);
|
|
extern void blk_limits_io_min(struct queue_limits *limits, unsigned int min);
|
|
extern void blk_queue_io_min(struct request_queue *q, unsigned int min);
|
|
extern void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt);
|
|
extern void blk_queue_io_opt(struct request_queue *q, unsigned int opt);
|
|
extern void blk_set_queue_depth(struct request_queue *q, unsigned int depth);
|
|
extern void blk_set_default_limits(struct queue_limits *lim);
|
|
extern void blk_set_stacking_limits(struct queue_limits *lim);
|
|
extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b,
|
|
sector_t offset);
|
|
extern int bdev_stack_limits(struct queue_limits *t, struct block_device *bdev,
|
|
sector_t offset);
|
|
extern void disk_stack_limits(struct gendisk *disk, struct block_device *bdev,
|
|
sector_t offset);
|
|
extern void blk_queue_stack_limits(struct request_queue *t, struct request_queue *b);
|
|
extern void blk_queue_update_dma_pad(struct request_queue *, unsigned int);
|
|
extern int blk_queue_dma_drain(struct request_queue *q,
|
|
dma_drain_needed_fn *dma_drain_needed,
|
|
void *buf, unsigned int size);
|
|
extern void blk_queue_segment_boundary(struct request_queue *, unsigned long);
|
|
extern void blk_queue_virt_boundary(struct request_queue *, unsigned long);
|
|
extern void blk_queue_dma_alignment(struct request_queue *, int);
|
|
extern void blk_queue_update_dma_alignment(struct request_queue *, int);
|
|
extern void blk_queue_rq_timeout(struct request_queue *, unsigned int);
|
|
extern void blk_queue_write_cache(struct request_queue *q, bool enabled, bool fua);
|
|
|
|
/*
|
|
* Number of physical segments as sent to the device.
|
|
*
|
|
* Normally this is the number of discontiguous data segments sent by the
|
|
* submitter. But for data-less command like discard we might have no
|
|
* actual data segments submitted, but the driver might have to add it's
|
|
* own special payload. In that case we still return 1 here so that this
|
|
* special payload will be mapped.
|
|
*/
|
|
static inline unsigned short blk_rq_nr_phys_segments(struct request *rq)
|
|
{
|
|
if (rq->rq_flags & RQF_SPECIAL_PAYLOAD)
|
|
return 1;
|
|
return rq->nr_phys_segments;
|
|
}
|
|
|
|
/*
|
|
* Number of discard segments (or ranges) the driver needs to fill in.
|
|
* Each discard bio merged into a request is counted as one segment.
|
|
*/
|
|
static inline unsigned short blk_rq_nr_discard_segments(struct request *rq)
|
|
{
|
|
return max_t(unsigned short, rq->nr_phys_segments, 1);
|
|
}
|
|
|
|
extern int blk_rq_map_sg(struct request_queue *, struct request *, struct scatterlist *);
|
|
extern void blk_dump_rq_flags(struct request *, char *);
|
|
extern long nr_blockdev_pages(void);
|
|
|
|
bool __must_check blk_get_queue(struct request_queue *);
|
|
struct request_queue *blk_alloc_queue(gfp_t);
|
|
struct request_queue *blk_alloc_queue_node(gfp_t gfp_mask, int node_id);
|
|
extern void blk_put_queue(struct request_queue *);
|
|
extern void blk_set_queue_dying(struct request_queue *);
|
|
|
|
/*
|
|
* blk_plug permits building a queue of related requests by holding the I/O
|
|
* fragments for a short period. This allows merging of sequential requests
|
|
* into single larger request. As the requests are moved from a per-task list to
|
|
* the device's request_queue in a batch, this results in improved scalability
|
|
* as the lock contention for request_queue lock is reduced.
|
|
*
|
|
* It is ok not to disable preemption when adding the request to the plug list
|
|
* or when attempting a merge, because blk_schedule_flush_list() will only flush
|
|
* the plug list when the task sleeps by itself. For details, please see
|
|
* schedule() where blk_schedule_flush_plug() is called.
|
|
*/
|
|
struct blk_plug {
|
|
struct list_head mq_list; /* blk-mq requests */
|
|
struct list_head cb_list; /* md requires an unplug callback */
|
|
unsigned short rq_count;
|
|
bool multiple_queues;
|
|
};
|
|
#define BLK_MAX_REQUEST_COUNT 16
|
|
#define BLK_PLUG_FLUSH_SIZE (128 * 1024)
|
|
|
|
struct blk_plug_cb;
|
|
typedef void (*blk_plug_cb_fn)(struct blk_plug_cb *, bool);
|
|
struct blk_plug_cb {
|
|
struct list_head list;
|
|
blk_plug_cb_fn callback;
|
|
void *data;
|
|
};
|
|
extern struct blk_plug_cb *blk_check_plugged(blk_plug_cb_fn unplug,
|
|
void *data, int size);
|
|
extern void blk_start_plug(struct blk_plug *);
|
|
extern void blk_finish_plug(struct blk_plug *);
|
|
extern void blk_flush_plug_list(struct blk_plug *, bool);
|
|
|
|
static inline void blk_flush_plug(struct task_struct *tsk)
|
|
{
|
|
struct blk_plug *plug = tsk->plug;
|
|
|
|
if (plug)
|
|
blk_flush_plug_list(plug, false);
|
|
}
|
|
|
|
static inline void blk_schedule_flush_plug(struct task_struct *tsk)
|
|
{
|
|
struct blk_plug *plug = tsk->plug;
|
|
|
|
if (plug)
|
|
blk_flush_plug_list(plug, true);
|
|
}
|
|
|
|
static inline bool blk_needs_flush_plug(struct task_struct *tsk)
|
|
{
|
|
struct blk_plug *plug = tsk->plug;
|
|
|
|
return plug &&
|
|
(!list_empty(&plug->mq_list) ||
|
|
!list_empty(&plug->cb_list));
|
|
}
|
|
|
|
extern int blkdev_issue_flush(struct block_device *, gfp_t, sector_t *);
|
|
extern int blkdev_issue_write_same(struct block_device *bdev, sector_t sector,
|
|
sector_t nr_sects, gfp_t gfp_mask, struct page *page);
|
|
|
|
#define BLKDEV_DISCARD_SECURE (1 << 0) /* issue a secure erase */
|
|
|
|
extern int blkdev_issue_discard(struct block_device *bdev, sector_t sector,
|
|
sector_t nr_sects, gfp_t gfp_mask, unsigned long flags);
|
|
extern int __blkdev_issue_discard(struct block_device *bdev, sector_t sector,
|
|
sector_t nr_sects, gfp_t gfp_mask, int flags,
|
|
struct bio **biop);
|
|
|
|
#define BLKDEV_ZERO_NOUNMAP (1 << 0) /* do not free blocks */
|
|
#define BLKDEV_ZERO_NOFALLBACK (1 << 1) /* don't write explicit zeroes */
|
|
|
|
extern int __blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
|
|
sector_t nr_sects, gfp_t gfp_mask, struct bio **biop,
|
|
unsigned flags);
|
|
extern int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
|
|
sector_t nr_sects, gfp_t gfp_mask, unsigned flags);
|
|
|
|
static inline int sb_issue_discard(struct super_block *sb, sector_t block,
|
|
sector_t nr_blocks, gfp_t gfp_mask, unsigned long flags)
|
|
{
|
|
return blkdev_issue_discard(sb->s_bdev,
|
|
block << (sb->s_blocksize_bits -
|
|
SECTOR_SHIFT),
|
|
nr_blocks << (sb->s_blocksize_bits -
|
|
SECTOR_SHIFT),
|
|
gfp_mask, flags);
|
|
}
|
|
static inline int sb_issue_zeroout(struct super_block *sb, sector_t block,
|
|
sector_t nr_blocks, gfp_t gfp_mask)
|
|
{
|
|
return blkdev_issue_zeroout(sb->s_bdev,
|
|
block << (sb->s_blocksize_bits -
|
|
SECTOR_SHIFT),
|
|
nr_blocks << (sb->s_blocksize_bits -
|
|
SECTOR_SHIFT),
|
|
gfp_mask, 0);
|
|
}
|
|
|
|
extern int blk_verify_command(unsigned char *cmd, fmode_t mode);
|
|
|
|
enum blk_default_limits {
|
|
BLK_MAX_SEGMENTS = 128,
|
|
BLK_SAFE_MAX_SECTORS = 255,
|
|
BLK_DEF_MAX_SECTORS = 2560,
|
|
BLK_MAX_SEGMENT_SIZE = 65536,
|
|
BLK_SEG_BOUNDARY_MASK = 0xFFFFFFFFUL,
|
|
};
|
|
|
|
static inline unsigned long queue_segment_boundary(struct request_queue *q)
|
|
{
|
|
return q->limits.seg_boundary_mask;
|
|
}
|
|
|
|
static inline unsigned long queue_virt_boundary(struct request_queue *q)
|
|
{
|
|
return q->limits.virt_boundary_mask;
|
|
}
|
|
|
|
static inline unsigned int queue_max_sectors(struct request_queue *q)
|
|
{
|
|
return q->limits.max_sectors;
|
|
}
|
|
|
|
static inline unsigned int queue_max_hw_sectors(struct request_queue *q)
|
|
{
|
|
return q->limits.max_hw_sectors;
|
|
}
|
|
|
|
static inline unsigned short queue_max_segments(struct request_queue *q)
|
|
{
|
|
return q->limits.max_segments;
|
|
}
|
|
|
|
static inline unsigned short queue_max_discard_segments(struct request_queue *q)
|
|
{
|
|
return q->limits.max_discard_segments;
|
|
}
|
|
|
|
static inline unsigned int queue_max_segment_size(struct request_queue *q)
|
|
{
|
|
return q->limits.max_segment_size;
|
|
}
|
|
|
|
static inline unsigned short queue_logical_block_size(struct request_queue *q)
|
|
{
|
|
int retval = 512;
|
|
|
|
if (q && q->limits.logical_block_size)
|
|
retval = q->limits.logical_block_size;
|
|
|
|
return retval;
|
|
}
|
|
|
|
static inline unsigned short bdev_logical_block_size(struct block_device *bdev)
|
|
{
|
|
return queue_logical_block_size(bdev_get_queue(bdev));
|
|
}
|
|
|
|
static inline unsigned int queue_physical_block_size(struct request_queue *q)
|
|
{
|
|
return q->limits.physical_block_size;
|
|
}
|
|
|
|
static inline unsigned int bdev_physical_block_size(struct block_device *bdev)
|
|
{
|
|
return queue_physical_block_size(bdev_get_queue(bdev));
|
|
}
|
|
|
|
static inline unsigned int queue_io_min(struct request_queue *q)
|
|
{
|
|
return q->limits.io_min;
|
|
}
|
|
|
|
static inline int bdev_io_min(struct block_device *bdev)
|
|
{
|
|
return queue_io_min(bdev_get_queue(bdev));
|
|
}
|
|
|
|
static inline unsigned int queue_io_opt(struct request_queue *q)
|
|
{
|
|
return q->limits.io_opt;
|
|
}
|
|
|
|
static inline int bdev_io_opt(struct block_device *bdev)
|
|
{
|
|
return queue_io_opt(bdev_get_queue(bdev));
|
|
}
|
|
|
|
static inline int queue_alignment_offset(struct request_queue *q)
|
|
{
|
|
if (q->limits.misaligned)
|
|
return -1;
|
|
|
|
return q->limits.alignment_offset;
|
|
}
|
|
|
|
static inline int queue_limit_alignment_offset(struct queue_limits *lim, sector_t sector)
|
|
{
|
|
unsigned int granularity = max(lim->physical_block_size, lim->io_min);
|
|
unsigned int alignment = sector_div(sector, granularity >> SECTOR_SHIFT)
|
|
<< SECTOR_SHIFT;
|
|
|
|
return (granularity + lim->alignment_offset - alignment) % granularity;
|
|
}
|
|
|
|
static inline int bdev_alignment_offset(struct block_device *bdev)
|
|
{
|
|
struct request_queue *q = bdev_get_queue(bdev);
|
|
|
|
if (q->limits.misaligned)
|
|
return -1;
|
|
|
|
if (bdev != bdev->bd_contains)
|
|
return bdev->bd_part->alignment_offset;
|
|
|
|
return q->limits.alignment_offset;
|
|
}
|
|
|
|
static inline int queue_discard_alignment(struct request_queue *q)
|
|
{
|
|
if (q->limits.discard_misaligned)
|
|
return -1;
|
|
|
|
return q->limits.discard_alignment;
|
|
}
|
|
|
|
static inline int queue_limit_discard_alignment(struct queue_limits *lim, sector_t sector)
|
|
{
|
|
unsigned int alignment, granularity, offset;
|
|
|
|
if (!lim->max_discard_sectors)
|
|
return 0;
|
|
|
|
/* Why are these in bytes, not sectors? */
|
|
alignment = lim->discard_alignment >> SECTOR_SHIFT;
|
|
granularity = lim->discard_granularity >> SECTOR_SHIFT;
|
|
if (!granularity)
|
|
return 0;
|
|
|
|
/* Offset of the partition start in 'granularity' sectors */
|
|
offset = sector_div(sector, granularity);
|
|
|
|
/* And why do we do this modulus *again* in blkdev_issue_discard()? */
|
|
offset = (granularity + alignment - offset) % granularity;
|
|
|
|
/* Turn it back into bytes, gaah */
|
|
return offset << SECTOR_SHIFT;
|
|
}
|
|
|
|
static inline int bdev_discard_alignment(struct block_device *bdev)
|
|
{
|
|
struct request_queue *q = bdev_get_queue(bdev);
|
|
|
|
if (bdev != bdev->bd_contains)
|
|
return bdev->bd_part->discard_alignment;
|
|
|
|
return q->limits.discard_alignment;
|
|
}
|
|
|
|
static inline unsigned int bdev_write_same(struct block_device *bdev)
|
|
{
|
|
struct request_queue *q = bdev_get_queue(bdev);
|
|
|
|
if (q)
|
|
return q->limits.max_write_same_sectors;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline unsigned int bdev_write_zeroes_sectors(struct block_device *bdev)
|
|
{
|
|
struct request_queue *q = bdev_get_queue(bdev);
|
|
|
|
if (q)
|
|
return q->limits.max_write_zeroes_sectors;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline enum blk_zoned_model bdev_zoned_model(struct block_device *bdev)
|
|
{
|
|
struct request_queue *q = bdev_get_queue(bdev);
|
|
|
|
if (q)
|
|
return blk_queue_zoned_model(q);
|
|
|
|
return BLK_ZONED_NONE;
|
|
}
|
|
|
|
static inline bool bdev_is_zoned(struct block_device *bdev)
|
|
{
|
|
struct request_queue *q = bdev_get_queue(bdev);
|
|
|
|
if (q)
|
|
return blk_queue_is_zoned(q);
|
|
|
|
return false;
|
|
}
|
|
|
|
static inline unsigned int bdev_zone_sectors(struct block_device *bdev)
|
|
{
|
|
struct request_queue *q = bdev_get_queue(bdev);
|
|
|
|
if (q)
|
|
return blk_queue_zone_sectors(q);
|
|
return 0;
|
|
}
|
|
|
|
static inline int queue_dma_alignment(struct request_queue *q)
|
|
{
|
|
return q ? q->dma_alignment : 511;
|
|
}
|
|
|
|
static inline int blk_rq_aligned(struct request_queue *q, unsigned long addr,
|
|
unsigned int len)
|
|
{
|
|
unsigned int alignment = queue_dma_alignment(q) | q->dma_pad_mask;
|
|
return !(addr & alignment) && !(len & alignment);
|
|
}
|
|
|
|
/* assumes size > 256 */
|
|
static inline unsigned int blksize_bits(unsigned int size)
|
|
{
|
|
unsigned int bits = 8;
|
|
do {
|
|
bits++;
|
|
size >>= 1;
|
|
} while (size > 256);
|
|
return bits;
|
|
}
|
|
|
|
static inline unsigned int block_size(struct block_device *bdev)
|
|
{
|
|
return bdev->bd_block_size;
|
|
}
|
|
|
|
typedef struct {struct page *v;} Sector;
|
|
|
|
unsigned char *read_dev_sector(struct block_device *, sector_t, Sector *);
|
|
|
|
static inline void put_dev_sector(Sector p)
|
|
{
|
|
put_page(p.v);
|
|
}
|
|
|
|
int kblockd_schedule_work(struct work_struct *work);
|
|
int kblockd_schedule_work_on(int cpu, struct work_struct *work);
|
|
int kblockd_mod_delayed_work_on(int cpu, struct delayed_work *dwork, unsigned long delay);
|
|
|
|
#define MODULE_ALIAS_BLOCKDEV(major,minor) \
|
|
MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor))
|
|
#define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \
|
|
MODULE_ALIAS("block-major-" __stringify(major) "-*")
|
|
|
|
#if defined(CONFIG_BLK_DEV_INTEGRITY)
|
|
|
|
enum blk_integrity_flags {
|
|
BLK_INTEGRITY_VERIFY = 1 << 0,
|
|
BLK_INTEGRITY_GENERATE = 1 << 1,
|
|
BLK_INTEGRITY_DEVICE_CAPABLE = 1 << 2,
|
|
BLK_INTEGRITY_IP_CHECKSUM = 1 << 3,
|
|
};
|
|
|
|
struct blk_integrity_iter {
|
|
void *prot_buf;
|
|
void *data_buf;
|
|
sector_t seed;
|
|
unsigned int data_size;
|
|
unsigned short interval;
|
|
const char *disk_name;
|
|
};
|
|
|
|
typedef blk_status_t (integrity_processing_fn) (struct blk_integrity_iter *);
|
|
|
|
struct blk_integrity_profile {
|
|
integrity_processing_fn *generate_fn;
|
|
integrity_processing_fn *verify_fn;
|
|
const char *name;
|
|
};
|
|
|
|
extern void blk_integrity_register(struct gendisk *, struct blk_integrity *);
|
|
extern void blk_integrity_unregister(struct gendisk *);
|
|
extern int blk_integrity_compare(struct gendisk *, struct gendisk *);
|
|
extern int blk_rq_map_integrity_sg(struct request_queue *, struct bio *,
|
|
struct scatterlist *);
|
|
extern int blk_rq_count_integrity_sg(struct request_queue *, struct bio *);
|
|
extern bool blk_integrity_merge_rq(struct request_queue *, struct request *,
|
|
struct request *);
|
|
extern bool blk_integrity_merge_bio(struct request_queue *, struct request *,
|
|
struct bio *);
|
|
|
|
static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk)
|
|
{
|
|
struct blk_integrity *bi = &disk->queue->integrity;
|
|
|
|
if (!bi->profile)
|
|
return NULL;
|
|
|
|
return bi;
|
|
}
|
|
|
|
static inline
|
|
struct blk_integrity *bdev_get_integrity(struct block_device *bdev)
|
|
{
|
|
return blk_get_integrity(bdev->bd_disk);
|
|
}
|
|
|
|
static inline bool blk_integrity_rq(struct request *rq)
|
|
{
|
|
return rq->cmd_flags & REQ_INTEGRITY;
|
|
}
|
|
|
|
static inline void blk_queue_max_integrity_segments(struct request_queue *q,
|
|
unsigned int segs)
|
|
{
|
|
q->limits.max_integrity_segments = segs;
|
|
}
|
|
|
|
static inline unsigned short
|
|
queue_max_integrity_segments(struct request_queue *q)
|
|
{
|
|
return q->limits.max_integrity_segments;
|
|
}
|
|
|
|
/**
|
|
* bio_integrity_intervals - Return number of integrity intervals for a bio
|
|
* @bi: blk_integrity profile for device
|
|
* @sectors: Size of the bio in 512-byte sectors
|
|
*
|
|
* Description: The block layer calculates everything in 512 byte
|
|
* sectors but integrity metadata is done in terms of the data integrity
|
|
* interval size of the storage device. Convert the block layer sectors
|
|
* to the appropriate number of integrity intervals.
|
|
*/
|
|
static inline unsigned int bio_integrity_intervals(struct blk_integrity *bi,
|
|
unsigned int sectors)
|
|
{
|
|
return sectors >> (bi->interval_exp - 9);
|
|
}
|
|
|
|
static inline unsigned int bio_integrity_bytes(struct blk_integrity *bi,
|
|
unsigned int sectors)
|
|
{
|
|
return bio_integrity_intervals(bi, sectors) * bi->tuple_size;
|
|
}
|
|
|
|
/*
|
|
* Return the first bvec that contains integrity data. Only drivers that are
|
|
* limited to a single integrity segment should use this helper.
|
|
*/
|
|
static inline struct bio_vec *rq_integrity_vec(struct request *rq)
|
|
{
|
|
if (WARN_ON_ONCE(queue_max_integrity_segments(rq->q) > 1))
|
|
return NULL;
|
|
return rq->bio->bi_integrity->bip_vec;
|
|
}
|
|
|
|
#else /* CONFIG_BLK_DEV_INTEGRITY */
|
|
|
|
struct bio;
|
|
struct block_device;
|
|
struct gendisk;
|
|
struct blk_integrity;
|
|
|
|
static inline int blk_integrity_rq(struct request *rq)
|
|
{
|
|
return 0;
|
|
}
|
|
static inline int blk_rq_count_integrity_sg(struct request_queue *q,
|
|
struct bio *b)
|
|
{
|
|
return 0;
|
|
}
|
|
static inline int blk_rq_map_integrity_sg(struct request_queue *q,
|
|
struct bio *b,
|
|
struct scatterlist *s)
|
|
{
|
|
return 0;
|
|
}
|
|
static inline struct blk_integrity *bdev_get_integrity(struct block_device *b)
|
|
{
|
|
return NULL;
|
|
}
|
|
static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk)
|
|
{
|
|
return NULL;
|
|
}
|
|
static inline int blk_integrity_compare(struct gendisk *a, struct gendisk *b)
|
|
{
|
|
return 0;
|
|
}
|
|
static inline void blk_integrity_register(struct gendisk *d,
|
|
struct blk_integrity *b)
|
|
{
|
|
}
|
|
static inline void blk_integrity_unregister(struct gendisk *d)
|
|
{
|
|
}
|
|
static inline void blk_queue_max_integrity_segments(struct request_queue *q,
|
|
unsigned int segs)
|
|
{
|
|
}
|
|
static inline unsigned short queue_max_integrity_segments(struct request_queue *q)
|
|
{
|
|
return 0;
|
|
}
|
|
static inline bool blk_integrity_merge_rq(struct request_queue *rq,
|
|
struct request *r1,
|
|
struct request *r2)
|
|
{
|
|
return true;
|
|
}
|
|
static inline bool blk_integrity_merge_bio(struct request_queue *rq,
|
|
struct request *r,
|
|
struct bio *b)
|
|
{
|
|
return true;
|
|
}
|
|
|
|
static inline unsigned int bio_integrity_intervals(struct blk_integrity *bi,
|
|
unsigned int sectors)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline unsigned int bio_integrity_bytes(struct blk_integrity *bi,
|
|
unsigned int sectors)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline struct bio_vec *rq_integrity_vec(struct request *rq)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
#endif /* CONFIG_BLK_DEV_INTEGRITY */
|
|
|
|
struct block_device_operations {
|
|
int (*open) (struct block_device *, fmode_t);
|
|
void (*release) (struct gendisk *, fmode_t);
|
|
int (*rw_page)(struct block_device *, sector_t, struct page *, unsigned int);
|
|
int (*ioctl) (struct block_device *, fmode_t, unsigned, unsigned long);
|
|
int (*compat_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long);
|
|
unsigned int (*check_events) (struct gendisk *disk,
|
|
unsigned int clearing);
|
|
/* ->media_changed() is DEPRECATED, use ->check_events() instead */
|
|
int (*media_changed) (struct gendisk *);
|
|
void (*unlock_native_capacity) (struct gendisk *);
|
|
int (*revalidate_disk) (struct gendisk *);
|
|
int (*getgeo)(struct block_device *, struct hd_geometry *);
|
|
/* this callback is with swap_lock and sometimes page table lock held */
|
|
void (*swap_slot_free_notify) (struct block_device *, unsigned long);
|
|
int (*report_zones)(struct gendisk *, sector_t sector,
|
|
struct blk_zone *zones, unsigned int *nr_zones,
|
|
gfp_t gfp_mask);
|
|
struct module *owner;
|
|
const struct pr_ops *pr_ops;
|
|
};
|
|
|
|
extern int __blkdev_driver_ioctl(struct block_device *, fmode_t, unsigned int,
|
|
unsigned long);
|
|
extern int bdev_read_page(struct block_device *, sector_t, struct page *);
|
|
extern int bdev_write_page(struct block_device *, sector_t, struct page *,
|
|
struct writeback_control *);
|
|
|
|
#ifdef CONFIG_BLK_DEV_ZONED
|
|
bool blk_req_needs_zone_write_lock(struct request *rq);
|
|
void __blk_req_zone_write_lock(struct request *rq);
|
|
void __blk_req_zone_write_unlock(struct request *rq);
|
|
|
|
static inline void blk_req_zone_write_lock(struct request *rq)
|
|
{
|
|
if (blk_req_needs_zone_write_lock(rq))
|
|
__blk_req_zone_write_lock(rq);
|
|
}
|
|
|
|
static inline void blk_req_zone_write_unlock(struct request *rq)
|
|
{
|
|
if (rq->rq_flags & RQF_ZONE_WRITE_LOCKED)
|
|
__blk_req_zone_write_unlock(rq);
|
|
}
|
|
|
|
static inline bool blk_req_zone_is_write_locked(struct request *rq)
|
|
{
|
|
return rq->q->seq_zones_wlock &&
|
|
test_bit(blk_rq_zone_no(rq), rq->q->seq_zones_wlock);
|
|
}
|
|
|
|
static inline bool blk_req_can_dispatch_to_zone(struct request *rq)
|
|
{
|
|
if (!blk_req_needs_zone_write_lock(rq))
|
|
return true;
|
|
return !blk_req_zone_is_write_locked(rq);
|
|
}
|
|
#else
|
|
static inline bool blk_req_needs_zone_write_lock(struct request *rq)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
static inline void blk_req_zone_write_lock(struct request *rq)
|
|
{
|
|
}
|
|
|
|
static inline void blk_req_zone_write_unlock(struct request *rq)
|
|
{
|
|
}
|
|
static inline bool blk_req_zone_is_write_locked(struct request *rq)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
static inline bool blk_req_can_dispatch_to_zone(struct request *rq)
|
|
{
|
|
return true;
|
|
}
|
|
#endif /* CONFIG_BLK_DEV_ZONED */
|
|
|
|
#else /* CONFIG_BLOCK */
|
|
|
|
struct block_device;
|
|
|
|
/*
|
|
* stubs for when the block layer is configured out
|
|
*/
|
|
#define buffer_heads_over_limit 0
|
|
|
|
static inline long nr_blockdev_pages(void)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
struct blk_plug {
|
|
};
|
|
|
|
static inline void blk_start_plug(struct blk_plug *plug)
|
|
{
|
|
}
|
|
|
|
static inline void blk_finish_plug(struct blk_plug *plug)
|
|
{
|
|
}
|
|
|
|
static inline void blk_flush_plug(struct task_struct *task)
|
|
{
|
|
}
|
|
|
|
static inline void blk_schedule_flush_plug(struct task_struct *task)
|
|
{
|
|
}
|
|
|
|
|
|
static inline bool blk_needs_flush_plug(struct task_struct *tsk)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
static inline int blkdev_issue_flush(struct block_device *bdev, gfp_t gfp_mask,
|
|
sector_t *error_sector)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
#endif /* CONFIG_BLOCK */
|
|
|
|
static inline void blk_wake_io_task(struct task_struct *waiter)
|
|
{
|
|
/*
|
|
* If we're polling, the task itself is doing the completions. For
|
|
* that case, we don't need to signal a wakeup, it's enough to just
|
|
* mark us as RUNNING.
|
|
*/
|
|
if (waiter == current)
|
|
__set_current_state(TASK_RUNNING);
|
|
else
|
|
wake_up_process(waiter);
|
|
}
|
|
|
|
#endif
|