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dm: move request-based code out to dm-rq.[hc]
Add some seperation between bio-based and request-based DM core code. 'struct mapped_device' and other DM core only structures and functions have been moved to dm-core.h and all relevant DM core .c files have been updated to include dm-core.h rather than dm.h DM targets should _never_ include dm-core.h! [block core merge conflict resolution from Stephen Rothwell] Signed-off-by: Mike Snitzer <snitzer@redhat.com> Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
This commit is contained in:
Mike Snitzer
parent
1a89694f78
commit
4cc96131af
@ -3,7 +3,8 @@
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#
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dm-mod-y += dm.o dm-table.o dm-target.o dm-linear.o dm-stripe.o \
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dm-ioctl.o dm-io.o dm-kcopyd.o dm-sysfs.o dm-stats.o
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dm-ioctl.o dm-io.o dm-kcopyd.o dm-sysfs.o dm-stats.o \
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dm-rq.o
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dm-multipath-y += dm-path-selector.o dm-mpath.o
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dm-snapshot-y += dm-snap.o dm-exception-store.o dm-snap-transient.o \
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dm-snap-persistent.o
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@ -1,4 +1,4 @@
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#include "dm.h"
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#include "dm-core.h"
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/*
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* The kobject release method must not be placed in the module itself,
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149
drivers/md/dm-core.h
Normal file
149
drivers/md/dm-core.h
Normal file
@ -0,0 +1,149 @@
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/*
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* Internal header file _only_ for device mapper core
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*
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* Copyright (C) 2016 Red Hat, Inc. All rights reserved.
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*
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* This file is released under the LGPL.
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*/
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#ifndef DM_CORE_INTERNAL_H
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#define DM_CORE_INTERNAL_H
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#include <linux/kthread.h>
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#include <linux/ktime.h>
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#include <linux/blk-mq.h>
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#include <trace/events/block.h>
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#include "dm.h"
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#define DM_RESERVED_MAX_IOS 1024
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struct dm_kobject_holder {
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struct kobject kobj;
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struct completion completion;
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};
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/*
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* DM core internal structure that used directly by dm.c and dm-rq.c
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* DM targets must _not_ deference a mapped_device to directly access its members!
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*/
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struct mapped_device {
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struct srcu_struct io_barrier;
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struct mutex suspend_lock;
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/*
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* The current mapping (struct dm_table *).
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* Use dm_get_live_table{_fast} or take suspend_lock for
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* dereference.
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*/
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void __rcu *map;
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struct list_head table_devices;
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struct mutex table_devices_lock;
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unsigned long flags;
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struct request_queue *queue;
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int numa_node_id;
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unsigned type;
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/* Protect queue and type against concurrent access. */
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struct mutex type_lock;
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atomic_t holders;
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atomic_t open_count;
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struct dm_target *immutable_target;
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struct target_type *immutable_target_type;
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struct gendisk *disk;
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char name[16];
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void *interface_ptr;
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/*
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* A list of ios that arrived while we were suspended.
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*/
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atomic_t pending[2];
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wait_queue_head_t wait;
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struct work_struct work;
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spinlock_t deferred_lock;
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struct bio_list deferred;
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/*
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* Event handling.
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*/
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wait_queue_head_t eventq;
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atomic_t event_nr;
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atomic_t uevent_seq;
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struct list_head uevent_list;
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spinlock_t uevent_lock; /* Protect access to uevent_list */
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/* the number of internal suspends */
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unsigned internal_suspend_count;
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/*
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* Processing queue (flush)
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*/
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struct workqueue_struct *wq;
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/*
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* io objects are allocated from here.
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*/
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mempool_t *io_pool;
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mempool_t *rq_pool;
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struct bio_set *bs;
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/*
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* freeze/thaw support require holding onto a super block
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*/
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struct super_block *frozen_sb;
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/* forced geometry settings */
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struct hd_geometry geometry;
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struct block_device *bdev;
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/* kobject and completion */
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struct dm_kobject_holder kobj_holder;
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/* zero-length flush that will be cloned and submitted to targets */
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struct bio flush_bio;
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struct dm_stats stats;
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struct kthread_worker kworker;
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struct task_struct *kworker_task;
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/* for request-based merge heuristic in dm_request_fn() */
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unsigned seq_rq_merge_deadline_usecs;
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int last_rq_rw;
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sector_t last_rq_pos;
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ktime_t last_rq_start_time;
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/* for blk-mq request-based DM support */
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struct blk_mq_tag_set *tag_set;
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bool use_blk_mq:1;
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bool init_tio_pdu:1;
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};
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void dm_init_md_queue(struct mapped_device *md);
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void dm_init_normal_md_queue(struct mapped_device *md);
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int md_in_flight(struct mapped_device *md);
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void disable_write_same(struct mapped_device *md);
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static inline struct completion *dm_get_completion_from_kobject(struct kobject *kobj)
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{
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return &container_of(kobj, struct dm_kobject_holder, kobj)->completion;
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}
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unsigned __dm_get_module_param(unsigned *module_param, unsigned def, unsigned max);
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static inline bool dm_message_test_buffer_overflow(char *result, unsigned maxlen)
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{
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return !maxlen || strlen(result) + 1 >= maxlen;
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}
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#endif
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@ -5,7 +5,7 @@
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* This file is released under the GPL.
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*/
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#include "dm.h"
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#include "dm-core.h"
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#include <linux/device-mapper.h>
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@ -5,7 +5,7 @@
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* This file is released under the GPL.
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*/
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#include "dm.h"
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#include "dm-core.h"
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#include <linux/module.h>
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#include <linux/vmalloc.h>
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@ -26,7 +26,7 @@
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#include <linux/device-mapper.h>
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#include <linux/dm-kcopyd.h>
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#include "dm.h"
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#include "dm-core.h"
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#define SUB_JOB_SIZE 128
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#define SPLIT_COUNT 8
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@ -7,7 +7,7 @@
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#include <linux/device-mapper.h>
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#include "dm.h"
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#include "dm-rq.h"
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#include "dm-path-selector.h"
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#include "dm-uevent.h"
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@ -1328,7 +1328,7 @@ static int do_end_io(struct multipath *m, struct request *clone,
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* during end I/O handling, since those clone requests don't have
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* bio clones. If we queue them inside the multipath target,
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* we need to make bio clones, that requires memory allocation.
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* (See drivers/md/dm.c:end_clone_bio() about why the clone requests
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* (See drivers/md/dm-rq.c:end_clone_bio() about why the clone requests
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* don't have bio clones.)
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* Instead of queueing the clone request here, we queue the original
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* request into dm core, which will remake a clone request and
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959
drivers/md/dm-rq.c
Normal file
959
drivers/md/dm-rq.c
Normal file
@ -0,0 +1,959 @@
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/*
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* Copyright (C) 2016 Red Hat, Inc. All rights reserved.
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*
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* This file is released under the GPL.
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*/
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#include "dm-core.h"
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#include "dm-rq.h"
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#include <linux/elevator.h> /* for rq_end_sector() */
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#include <linux/blk-mq.h>
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#define DM_MSG_PREFIX "core-rq"
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#define DM_MQ_NR_HW_QUEUES 1
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#define DM_MQ_QUEUE_DEPTH 2048
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static unsigned dm_mq_nr_hw_queues = DM_MQ_NR_HW_QUEUES;
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static unsigned dm_mq_queue_depth = DM_MQ_QUEUE_DEPTH;
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/*
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* Request-based DM's mempools' reserved IOs set by the user.
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*/
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#define RESERVED_REQUEST_BASED_IOS 256
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static unsigned reserved_rq_based_ios = RESERVED_REQUEST_BASED_IOS;
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#ifdef CONFIG_DM_MQ_DEFAULT
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static bool use_blk_mq = true;
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#else
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static bool use_blk_mq = false;
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#endif
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bool dm_use_blk_mq_default(void)
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{
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return use_blk_mq;
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}
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bool dm_use_blk_mq(struct mapped_device *md)
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{
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return md->use_blk_mq;
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}
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EXPORT_SYMBOL_GPL(dm_use_blk_mq);
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unsigned dm_get_reserved_rq_based_ios(void)
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{
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return __dm_get_module_param(&reserved_rq_based_ios,
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RESERVED_REQUEST_BASED_IOS, DM_RESERVED_MAX_IOS);
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}
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EXPORT_SYMBOL_GPL(dm_get_reserved_rq_based_ios);
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static unsigned dm_get_blk_mq_nr_hw_queues(void)
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{
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return __dm_get_module_param(&dm_mq_nr_hw_queues, 1, 32);
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}
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static unsigned dm_get_blk_mq_queue_depth(void)
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{
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return __dm_get_module_param(&dm_mq_queue_depth,
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DM_MQ_QUEUE_DEPTH, BLK_MQ_MAX_DEPTH);
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}
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int dm_request_based(struct mapped_device *md)
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{
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return blk_queue_stackable(md->queue);
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}
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static void dm_old_start_queue(struct request_queue *q)
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{
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unsigned long flags;
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spin_lock_irqsave(q->queue_lock, flags);
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if (blk_queue_stopped(q))
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blk_start_queue(q);
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spin_unlock_irqrestore(q->queue_lock, flags);
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}
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void dm_start_queue(struct request_queue *q)
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{
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if (!q->mq_ops)
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dm_old_start_queue(q);
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else {
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blk_mq_start_stopped_hw_queues(q, true);
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blk_mq_kick_requeue_list(q);
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}
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}
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static void dm_old_stop_queue(struct request_queue *q)
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{
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unsigned long flags;
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spin_lock_irqsave(q->queue_lock, flags);
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if (blk_queue_stopped(q)) {
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spin_unlock_irqrestore(q->queue_lock, flags);
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return;
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}
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blk_stop_queue(q);
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spin_unlock_irqrestore(q->queue_lock, flags);
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}
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void dm_stop_queue(struct request_queue *q)
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{
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if (!q->mq_ops)
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dm_old_stop_queue(q);
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else
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blk_mq_stop_hw_queues(q);
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}
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static struct dm_rq_target_io *alloc_old_rq_tio(struct mapped_device *md,
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gfp_t gfp_mask)
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{
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return mempool_alloc(md->io_pool, gfp_mask);
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}
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static void free_old_rq_tio(struct dm_rq_target_io *tio)
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{
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mempool_free(tio, tio->md->io_pool);
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}
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static struct request *alloc_old_clone_request(struct mapped_device *md,
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gfp_t gfp_mask)
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{
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return mempool_alloc(md->rq_pool, gfp_mask);
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}
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static void free_old_clone_request(struct mapped_device *md, struct request *rq)
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{
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mempool_free(rq, md->rq_pool);
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}
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/*
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* Partial completion handling for request-based dm
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*/
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static void end_clone_bio(struct bio *clone)
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{
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struct dm_rq_clone_bio_info *info =
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container_of(clone, struct dm_rq_clone_bio_info, clone);
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struct dm_rq_target_io *tio = info->tio;
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struct bio *bio = info->orig;
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unsigned int nr_bytes = info->orig->bi_iter.bi_size;
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int error = clone->bi_error;
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bio_put(clone);
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if (tio->error)
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/*
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* An error has already been detected on the request.
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* Once error occurred, just let clone->end_io() handle
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* the remainder.
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*/
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return;
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else if (error) {
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/*
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* Don't notice the error to the upper layer yet.
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* The error handling decision is made by the target driver,
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* when the request is completed.
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*/
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tio->error = error;
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return;
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}
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/*
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* I/O for the bio successfully completed.
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* Notice the data completion to the upper layer.
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*/
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/*
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* bios are processed from the head of the list.
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* So the completing bio should always be rq->bio.
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* If it's not, something wrong is happening.
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*/
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if (tio->orig->bio != bio)
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DMERR("bio completion is going in the middle of the request");
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/*
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* Update the original request.
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* Do not use blk_end_request() here, because it may complete
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* the original request before the clone, and break the ordering.
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*/
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blk_update_request(tio->orig, 0, nr_bytes);
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}
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static struct dm_rq_target_io *tio_from_request(struct request *rq)
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{
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return (rq->q->mq_ops ? blk_mq_rq_to_pdu(rq) : rq->special);
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}
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static void rq_end_stats(struct mapped_device *md, struct request *orig)
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{
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if (unlikely(dm_stats_used(&md->stats))) {
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struct dm_rq_target_io *tio = tio_from_request(orig);
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tio->duration_jiffies = jiffies - tio->duration_jiffies;
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dm_stats_account_io(&md->stats, rq_data_dir(orig),
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blk_rq_pos(orig), tio->n_sectors, true,
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tio->duration_jiffies, &tio->stats_aux);
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}
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}
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/*
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* Don't touch any member of the md after calling this function because
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* the md may be freed in dm_put() at the end of this function.
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* Or do dm_get() before calling this function and dm_put() later.
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*/
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static void rq_completed(struct mapped_device *md, int rw, bool run_queue)
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{
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atomic_dec(&md->pending[rw]);
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/* nudge anyone waiting on suspend queue */
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if (!md_in_flight(md))
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wake_up(&md->wait);
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/*
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* Run this off this callpath, as drivers could invoke end_io while
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* inside their request_fn (and holding the queue lock). Calling
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* back into ->request_fn() could deadlock attempting to grab the
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* queue lock again.
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*/
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if (!md->queue->mq_ops && run_queue)
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blk_run_queue_async(md->queue);
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/*
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* dm_put() must be at the end of this function. See the comment above
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*/
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dm_put(md);
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}
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static void free_rq_clone(struct request *clone)
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{
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struct dm_rq_target_io *tio = clone->end_io_data;
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struct mapped_device *md = tio->md;
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blk_rq_unprep_clone(clone);
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if (md->type == DM_TYPE_MQ_REQUEST_BASED)
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/* stacked on blk-mq queue(s) */
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tio->ti->type->release_clone_rq(clone);
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else if (!md->queue->mq_ops)
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/* request_fn queue stacked on request_fn queue(s) */
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free_old_clone_request(md, clone);
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if (!md->queue->mq_ops)
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free_old_rq_tio(tio);
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}
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/*
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* Complete the clone and the original request.
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* Must be called without clone's queue lock held,
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* see end_clone_request() for more details.
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*/
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static void dm_end_request(struct request *clone, int error)
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{
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int rw = rq_data_dir(clone);
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struct dm_rq_target_io *tio = clone->end_io_data;
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struct mapped_device *md = tio->md;
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struct request *rq = tio->orig;
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if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
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rq->errors = clone->errors;
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rq->resid_len = clone->resid_len;
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if (rq->sense)
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/*
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* We are using the sense buffer of the original
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* request.
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* So setting the length of the sense data is enough.
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*/
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rq->sense_len = clone->sense_len;
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}
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free_rq_clone(clone);
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rq_end_stats(md, rq);
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if (!rq->q->mq_ops)
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blk_end_request_all(rq, error);
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else
|
||||
blk_mq_end_request(rq, error);
|
||||
rq_completed(md, rw, true);
|
||||
}
|
||||
|
||||
static void dm_unprep_request(struct request *rq)
|
||||
{
|
||||
struct dm_rq_target_io *tio = tio_from_request(rq);
|
||||
struct request *clone = tio->clone;
|
||||
|
||||
if (!rq->q->mq_ops) {
|
||||
rq->special = NULL;
|
||||
rq->cmd_flags &= ~REQ_DONTPREP;
|
||||
}
|
||||
|
||||
if (clone)
|
||||
free_rq_clone(clone);
|
||||
else if (!tio->md->queue->mq_ops)
|
||||
free_old_rq_tio(tio);
|
||||
}
|
||||
|
||||
/*
|
||||
* Requeue the original request of a clone.
|
||||
*/
|
||||
static void dm_old_requeue_request(struct request *rq)
|
||||
{
|
||||
struct request_queue *q = rq->q;
|
||||
unsigned long flags;
|
||||
|
||||
spin_lock_irqsave(q->queue_lock, flags);
|
||||
blk_requeue_request(q, rq);
|
||||
blk_run_queue_async(q);
|
||||
spin_unlock_irqrestore(q->queue_lock, flags);
|
||||
}
|
||||
|
||||
static void dm_mq_requeue_request(struct request *rq)
|
||||
{
|
||||
struct request_queue *q = rq->q;
|
||||
unsigned long flags;
|
||||
|
||||
blk_mq_requeue_request(rq);
|
||||
spin_lock_irqsave(q->queue_lock, flags);
|
||||
if (!blk_queue_stopped(q))
|
||||
blk_mq_kick_requeue_list(q);
|
||||
spin_unlock_irqrestore(q->queue_lock, flags);
|
||||
}
|
||||
|
||||
static void dm_requeue_original_request(struct mapped_device *md,
|
||||
struct request *rq)
|
||||
{
|
||||
int rw = rq_data_dir(rq);
|
||||
|
||||
rq_end_stats(md, rq);
|
||||
dm_unprep_request(rq);
|
||||
|
||||
if (!rq->q->mq_ops)
|
||||
dm_old_requeue_request(rq);
|
||||
else
|
||||
dm_mq_requeue_request(rq);
|
||||
|
||||
rq_completed(md, rw, false);
|
||||
}
|
||||
|
||||
static void dm_done(struct request *clone, int error, bool mapped)
|
||||
{
|
||||
int r = error;
|
||||
struct dm_rq_target_io *tio = clone->end_io_data;
|
||||
dm_request_endio_fn rq_end_io = NULL;
|
||||
|
||||
if (tio->ti) {
|
||||
rq_end_io = tio->ti->type->rq_end_io;
|
||||
|
||||
if (mapped && rq_end_io)
|
||||
r = rq_end_io(tio->ti, clone, error, &tio->info);
|
||||
}
|
||||
|
||||
if (unlikely(r == -EREMOTEIO && (req_op(clone) == REQ_OP_WRITE_SAME) &&
|
||||
!clone->q->limits.max_write_same_sectors))
|
||||
disable_write_same(tio->md);
|
||||
|
||||
if (r <= 0)
|
||||
/* The target wants to complete the I/O */
|
||||
dm_end_request(clone, r);
|
||||
else if (r == DM_ENDIO_INCOMPLETE)
|
||||
/* The target will handle the I/O */
|
||||
return;
|
||||
else if (r == DM_ENDIO_REQUEUE)
|
||||
/* The target wants to requeue the I/O */
|
||||
dm_requeue_original_request(tio->md, tio->orig);
|
||||
else {
|
||||
DMWARN("unimplemented target endio return value: %d", r);
|
||||
BUG();
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* Request completion handler for request-based dm
|
||||
*/
|
||||
static void dm_softirq_done(struct request *rq)
|
||||
{
|
||||
bool mapped = true;
|
||||
struct dm_rq_target_io *tio = tio_from_request(rq);
|
||||
struct request *clone = tio->clone;
|
||||
int rw;
|
||||
|
||||
if (!clone) {
|
||||
rq_end_stats(tio->md, rq);
|
||||
rw = rq_data_dir(rq);
|
||||
if (!rq->q->mq_ops) {
|
||||
blk_end_request_all(rq, tio->error);
|
||||
rq_completed(tio->md, rw, false);
|
||||
free_old_rq_tio(tio);
|
||||
} else {
|
||||
blk_mq_end_request(rq, tio->error);
|
||||
rq_completed(tio->md, rw, false);
|
||||
}
|
||||
return;
|
||||
}
|
||||
|
||||
if (rq->cmd_flags & REQ_FAILED)
|
||||
mapped = false;
|
||||
|
||||
dm_done(clone, tio->error, mapped);
|
||||
}
|
||||
|
||||
/*
|
||||
* Complete the clone and the original request with the error status
|
||||
* through softirq context.
|
||||
*/
|
||||
static void dm_complete_request(struct request *rq, int error)
|
||||
{
|
||||
struct dm_rq_target_io *tio = tio_from_request(rq);
|
||||
|
||||
tio->error = error;
|
||||
if (!rq->q->mq_ops)
|
||||
blk_complete_request(rq);
|
||||
else
|
||||
blk_mq_complete_request(rq, error);
|
||||
}
|
||||
|
||||
/*
|
||||
* Complete the not-mapped clone and the original request with the error status
|
||||
* through softirq context.
|
||||
* Target's rq_end_io() function isn't called.
|
||||
* This may be used when the target's map_rq() or clone_and_map_rq() functions fail.
|
||||
*/
|
||||
static void dm_kill_unmapped_request(struct request *rq, int error)
|
||||
{
|
||||
rq->cmd_flags |= REQ_FAILED;
|
||||
dm_complete_request(rq, error);
|
||||
}
|
||||
|
||||
/*
|
||||
* Called with the clone's queue lock held (in the case of .request_fn)
|
||||
*/
|
||||
static void end_clone_request(struct request *clone, int error)
|
||||
{
|
||||
struct dm_rq_target_io *tio = clone->end_io_data;
|
||||
|
||||
if (!clone->q->mq_ops) {
|
||||
/*
|
||||
* For just cleaning up the information of the queue in which
|
||||
* the clone was dispatched.
|
||||
* The clone is *NOT* freed actually here because it is alloced
|
||||
* from dm own mempool (REQ_ALLOCED isn't set).
|
||||
*/
|
||||
__blk_put_request(clone->q, clone);
|
||||
}
|
||||
|
||||
/*
|
||||
* Actual request completion is done in a softirq context which doesn't
|
||||
* hold the clone's queue lock. Otherwise, deadlock could occur because:
|
||||
* - another request may be submitted by the upper level driver
|
||||
* of the stacking during the completion
|
||||
* - the submission which requires queue lock may be done
|
||||
* against this clone's queue
|
||||
*/
|
||||
dm_complete_request(tio->orig, error);
|
||||
}
|
||||
|
||||
static void dm_dispatch_clone_request(struct request *clone, struct request *rq)
|
||||
{
|
||||
int r;
|
||||
|
||||
if (blk_queue_io_stat(clone->q))
|
||||
clone->cmd_flags |= REQ_IO_STAT;
|
||||
|
||||
clone->start_time = jiffies;
|
||||
r = blk_insert_cloned_request(clone->q, clone);
|
||||
if (r)
|
||||
/* must complete clone in terms of original request */
|
||||
dm_complete_request(rq, r);
|
||||
}
|
||||
|
||||
static int dm_rq_bio_constructor(struct bio *bio, struct bio *bio_orig,
|
||||
void *data)
|
||||
{
|
||||
struct dm_rq_target_io *tio = data;
|
||||
struct dm_rq_clone_bio_info *info =
|
||||
container_of(bio, struct dm_rq_clone_bio_info, clone);
|
||||
|
||||
info->orig = bio_orig;
|
||||
info->tio = tio;
|
||||
bio->bi_end_io = end_clone_bio;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int setup_clone(struct request *clone, struct request *rq,
|
||||
struct dm_rq_target_io *tio, gfp_t gfp_mask)
|
||||
{
|
||||
int r;
|
||||
|
||||
r = blk_rq_prep_clone(clone, rq, tio->md->bs, gfp_mask,
|
||||
dm_rq_bio_constructor, tio);
|
||||
if (r)
|
||||
return r;
|
||||
|
||||
clone->cmd = rq->cmd;
|
||||
clone->cmd_len = rq->cmd_len;
|
||||
clone->sense = rq->sense;
|
||||
clone->end_io = end_clone_request;
|
||||
clone->end_io_data = tio;
|
||||
|
||||
tio->clone = clone;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct request *clone_old_rq(struct request *rq, struct mapped_device *md,
|
||||
struct dm_rq_target_io *tio, gfp_t gfp_mask)
|
||||
{
|
||||
/*
|
||||
* Create clone for use with .request_fn request_queue
|
||||
*/
|
||||
struct request *clone;
|
||||
|
||||
clone = alloc_old_clone_request(md, gfp_mask);
|
||||
if (!clone)
|
||||
return NULL;
|
||||
|
||||
blk_rq_init(NULL, clone);
|
||||
if (setup_clone(clone, rq, tio, gfp_mask)) {
|
||||
/* -ENOMEM */
|
||||
free_old_clone_request(md, clone);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
return clone;
|
||||
}
|
||||
|
||||
static void map_tio_request(struct kthread_work *work);
|
||||
|
||||
static void init_tio(struct dm_rq_target_io *tio, struct request *rq,
|
||||
struct mapped_device *md)
|
||||
{
|
||||
tio->md = md;
|
||||
tio->ti = NULL;
|
||||
tio->clone = NULL;
|
||||
tio->orig = rq;
|
||||
tio->error = 0;
|
||||
/*
|
||||
* Avoid initializing info for blk-mq; it passes
|
||||
* target-specific data through info.ptr
|
||||
* (see: dm_mq_init_request)
|
||||
*/
|
||||
if (!md->init_tio_pdu)
|
||||
memset(&tio->info, 0, sizeof(tio->info));
|
||||
if (md->kworker_task)
|
||||
init_kthread_work(&tio->work, map_tio_request);
|
||||
}
|
||||
|
||||
static struct dm_rq_target_io *dm_old_prep_tio(struct request *rq,
|
||||
struct mapped_device *md,
|
||||
gfp_t gfp_mask)
|
||||
{
|
||||
struct dm_rq_target_io *tio;
|
||||
int srcu_idx;
|
||||
struct dm_table *table;
|
||||
|
||||
tio = alloc_old_rq_tio(md, gfp_mask);
|
||||
if (!tio)
|
||||
return NULL;
|
||||
|
||||
init_tio(tio, rq, md);
|
||||
|
||||
table = dm_get_live_table(md, &srcu_idx);
|
||||
/*
|
||||
* Must clone a request if this .request_fn DM device
|
||||
* is stacked on .request_fn device(s).
|
||||
*/
|
||||
if (!dm_table_mq_request_based(table)) {
|
||||
if (!clone_old_rq(rq, md, tio, gfp_mask)) {
|
||||
dm_put_live_table(md, srcu_idx);
|
||||
free_old_rq_tio(tio);
|
||||
return NULL;
|
||||
}
|
||||
}
|
||||
dm_put_live_table(md, srcu_idx);
|
||||
|
||||
return tio;
|
||||
}
|
||||
|
||||
/*
|
||||
* Called with the queue lock held.
|
||||
*/
|
||||
static int dm_old_prep_fn(struct request_queue *q, struct request *rq)
|
||||
{
|
||||
struct mapped_device *md = q->queuedata;
|
||||
struct dm_rq_target_io *tio;
|
||||
|
||||
if (unlikely(rq->special)) {
|
||||
DMWARN("Already has something in rq->special.");
|
||||
return BLKPREP_KILL;
|
||||
}
|
||||
|
||||
tio = dm_old_prep_tio(rq, md, GFP_ATOMIC);
|
||||
if (!tio)
|
||||
return BLKPREP_DEFER;
|
||||
|
||||
rq->special = tio;
|
||||
rq->cmd_flags |= REQ_DONTPREP;
|
||||
|
||||
return BLKPREP_OK;
|
||||
}
|
||||
|
||||
/*
|
||||
* Returns:
|
||||
* 0 : the request has been processed
|
||||
* DM_MAPIO_REQUEUE : the original request needs to be requeued
|
||||
* < 0 : the request was completed due to failure
|
||||
*/
|
||||
static int map_request(struct dm_rq_target_io *tio, struct request *rq,
|
||||
struct mapped_device *md)
|
||||
{
|
||||
int r;
|
||||
struct dm_target *ti = tio->ti;
|
||||
struct request *clone = NULL;
|
||||
|
||||
if (tio->clone) {
|
||||
clone = tio->clone;
|
||||
r = ti->type->map_rq(ti, clone, &tio->info);
|
||||
} else {
|
||||
r = ti->type->clone_and_map_rq(ti, rq, &tio->info, &clone);
|
||||
if (r < 0) {
|
||||
/* The target wants to complete the I/O */
|
||||
dm_kill_unmapped_request(rq, r);
|
||||
return r;
|
||||
}
|
||||
if (r != DM_MAPIO_REMAPPED)
|
||||
return r;
|
||||
if (setup_clone(clone, rq, tio, GFP_ATOMIC)) {
|
||||
/* -ENOMEM */
|
||||
ti->type->release_clone_rq(clone);
|
||||
return DM_MAPIO_REQUEUE;
|
||||
}
|
||||
}
|
||||
|
||||
switch (r) {
|
||||
case DM_MAPIO_SUBMITTED:
|
||||
/* The target has taken the I/O to submit by itself later */
|
||||
break;
|
||||
case DM_MAPIO_REMAPPED:
|
||||
/* The target has remapped the I/O so dispatch it */
|
||||
trace_block_rq_remap(clone->q, clone, disk_devt(dm_disk(md)),
|
||||
blk_rq_pos(rq));
|
||||
dm_dispatch_clone_request(clone, rq);
|
||||
break;
|
||||
case DM_MAPIO_REQUEUE:
|
||||
/* The target wants to requeue the I/O */
|
||||
dm_requeue_original_request(md, tio->orig);
|
||||
break;
|
||||
default:
|
||||
if (r > 0) {
|
||||
DMWARN("unimplemented target map return value: %d", r);
|
||||
BUG();
|
||||
}
|
||||
|
||||
/* The target wants to complete the I/O */
|
||||
dm_kill_unmapped_request(rq, r);
|
||||
return r;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void dm_start_request(struct mapped_device *md, struct request *orig)
|
||||
{
|
||||
if (!orig->q->mq_ops)
|
||||
blk_start_request(orig);
|
||||
else
|
||||
blk_mq_start_request(orig);
|
||||
atomic_inc(&md->pending[rq_data_dir(orig)]);
|
||||
|
||||
if (md->seq_rq_merge_deadline_usecs) {
|
||||
md->last_rq_pos = rq_end_sector(orig);
|
||||
md->last_rq_rw = rq_data_dir(orig);
|
||||
md->last_rq_start_time = ktime_get();
|
||||
}
|
||||
|
||||
if (unlikely(dm_stats_used(&md->stats))) {
|
||||
struct dm_rq_target_io *tio = tio_from_request(orig);
|
||||
tio->duration_jiffies = jiffies;
|
||||
tio->n_sectors = blk_rq_sectors(orig);
|
||||
dm_stats_account_io(&md->stats, rq_data_dir(orig),
|
||||
blk_rq_pos(orig), tio->n_sectors, false, 0,
|
||||
&tio->stats_aux);
|
||||
}
|
||||
|
||||
/*
|
||||
* Hold the md reference here for the in-flight I/O.
|
||||
* We can't rely on the reference count by device opener,
|
||||
* because the device may be closed during the request completion
|
||||
* when all bios are completed.
|
||||
* See the comment in rq_completed() too.
|
||||
*/
|
||||
dm_get(md);
|
||||
}
|
||||
|
||||
static void map_tio_request(struct kthread_work *work)
|
||||
{
|
||||
struct dm_rq_target_io *tio = container_of(work, struct dm_rq_target_io, work);
|
||||
struct request *rq = tio->orig;
|
||||
struct mapped_device *md = tio->md;
|
||||
|
||||
if (map_request(tio, rq, md) == DM_MAPIO_REQUEUE)
|
||||
dm_requeue_original_request(md, rq);
|
||||
}
|
||||
|
||||
ssize_t dm_attr_rq_based_seq_io_merge_deadline_show(struct mapped_device *md, char *buf)
|
||||
{
|
||||
return sprintf(buf, "%u\n", md->seq_rq_merge_deadline_usecs);
|
||||
}
|
||||
|
||||
#define MAX_SEQ_RQ_MERGE_DEADLINE_USECS 100000
|
||||
|
||||
ssize_t dm_attr_rq_based_seq_io_merge_deadline_store(struct mapped_device *md,
|
||||
const char *buf, size_t count)
|
||||
{
|
||||
unsigned deadline;
|
||||
|
||||
if (!dm_request_based(md) || md->use_blk_mq)
|
||||
return count;
|
||||
|
||||
if (kstrtouint(buf, 10, &deadline))
|
||||
return -EINVAL;
|
||||
|
||||
if (deadline > MAX_SEQ_RQ_MERGE_DEADLINE_USECS)
|
||||
deadline = MAX_SEQ_RQ_MERGE_DEADLINE_USECS;
|
||||
|
||||
md->seq_rq_merge_deadline_usecs = deadline;
|
||||
|
||||
return count;
|
||||
}
|
||||
|
||||
static bool dm_old_request_peeked_before_merge_deadline(struct mapped_device *md)
|
||||
{
|
||||
ktime_t kt_deadline;
|
||||
|
||||
if (!md->seq_rq_merge_deadline_usecs)
|
||||
return false;
|
||||
|
||||
kt_deadline = ns_to_ktime((u64)md->seq_rq_merge_deadline_usecs * NSEC_PER_USEC);
|
||||
kt_deadline = ktime_add_safe(md->last_rq_start_time, kt_deadline);
|
||||
|
||||
return !ktime_after(ktime_get(), kt_deadline);
|
||||
}
|
||||
|
||||
/*
|
||||
* q->request_fn for old request-based dm.
|
||||
* Called with the queue lock held.
|
||||
*/
|
||||
static void dm_old_request_fn(struct request_queue *q)
|
||||
{
|
||||
struct mapped_device *md = q->queuedata;
|
||||
struct dm_target *ti = md->immutable_target;
|
||||
struct request *rq;
|
||||
struct dm_rq_target_io *tio;
|
||||
sector_t pos = 0;
|
||||
|
||||
if (unlikely(!ti)) {
|
||||
int srcu_idx;
|
||||
struct dm_table *map = dm_get_live_table(md, &srcu_idx);
|
||||
|
||||
ti = dm_table_find_target(map, pos);
|
||||
dm_put_live_table(md, srcu_idx);
|
||||
}
|
||||
|
||||
/*
|
||||
* For suspend, check blk_queue_stopped() and increment
|
||||
* ->pending within a single queue_lock not to increment the
|
||||
* number of in-flight I/Os after the queue is stopped in
|
||||
* dm_suspend().
|
||||
*/
|
||||
while (!blk_queue_stopped(q)) {
|
||||
rq = blk_peek_request(q);
|
||||
if (!rq)
|
||||
return;
|
||||
|
||||
/* always use block 0 to find the target for flushes for now */
|
||||
pos = 0;
|
||||
if (req_op(rq) != REQ_OP_FLUSH)
|
||||
pos = blk_rq_pos(rq);
|
||||
|
||||
if ((dm_old_request_peeked_before_merge_deadline(md) &&
|
||||
md_in_flight(md) && rq->bio && rq->bio->bi_vcnt == 1 &&
|
||||
md->last_rq_pos == pos && md->last_rq_rw == rq_data_dir(rq)) ||
|
||||
(ti->type->busy && ti->type->busy(ti))) {
|
||||
blk_delay_queue(q, HZ / 100);
|
||||
return;
|
||||
}
|
||||
|
||||
dm_start_request(md, rq);
|
||||
|
||||
tio = tio_from_request(rq);
|
||||
/* Establish tio->ti before queuing work (map_tio_request) */
|
||||
tio->ti = ti;
|
||||
queue_kthread_work(&md->kworker, &tio->work);
|
||||
BUG_ON(!irqs_disabled());
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* Fully initialize a .request_fn request-based queue.
|
||||
*/
|
||||
int dm_old_init_request_queue(struct mapped_device *md)
|
||||
{
|
||||
/* Fully initialize the queue */
|
||||
if (!blk_init_allocated_queue(md->queue, dm_old_request_fn, NULL))
|
||||
return -EINVAL;
|
||||
|
||||
/* disable dm_old_request_fn's merge heuristic by default */
|
||||
md->seq_rq_merge_deadline_usecs = 0;
|
||||
|
||||
dm_init_normal_md_queue(md);
|
||||
blk_queue_softirq_done(md->queue, dm_softirq_done);
|
||||
blk_queue_prep_rq(md->queue, dm_old_prep_fn);
|
||||
|
||||
/* Initialize the request-based DM worker thread */
|
||||
init_kthread_worker(&md->kworker);
|
||||
md->kworker_task = kthread_run(kthread_worker_fn, &md->kworker,
|
||||
"kdmwork-%s", dm_device_name(md));
|
||||
|
||||
elv_register_queue(md->queue);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int dm_mq_init_request(void *data, struct request *rq,
|
||||
unsigned int hctx_idx, unsigned int request_idx,
|
||||
unsigned int numa_node)
|
||||
{
|
||||
struct mapped_device *md = data;
|
||||
struct dm_rq_target_io *tio = blk_mq_rq_to_pdu(rq);
|
||||
|
||||
/*
|
||||
* Must initialize md member of tio, otherwise it won't
|
||||
* be available in dm_mq_queue_rq.
|
||||
*/
|
||||
tio->md = md;
|
||||
|
||||
if (md->init_tio_pdu) {
|
||||
/* target-specific per-io data is immediately after the tio */
|
||||
tio->info.ptr = tio + 1;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int dm_mq_queue_rq(struct blk_mq_hw_ctx *hctx,
|
||||
const struct blk_mq_queue_data *bd)
|
||||
{
|
||||
struct request *rq = bd->rq;
|
||||
struct dm_rq_target_io *tio = blk_mq_rq_to_pdu(rq);
|
||||
struct mapped_device *md = tio->md;
|
||||
struct dm_target *ti = md->immutable_target;
|
||||
|
||||
if (unlikely(!ti)) {
|
||||
int srcu_idx;
|
||||
struct dm_table *map = dm_get_live_table(md, &srcu_idx);
|
||||
|
||||
ti = dm_table_find_target(map, 0);
|
||||
dm_put_live_table(md, srcu_idx);
|
||||
}
|
||||
|
||||
if (ti->type->busy && ti->type->busy(ti))
|
||||
return BLK_MQ_RQ_QUEUE_BUSY;
|
||||
|
||||
dm_start_request(md, rq);
|
||||
|
||||
/* Init tio using md established in .init_request */
|
||||
init_tio(tio, rq, md);
|
||||
|
||||
/*
|
||||
* Establish tio->ti before calling map_request().
|
||||
*/
|
||||
tio->ti = ti;
|
||||
|
||||
/* Direct call is fine since .queue_rq allows allocations */
|
||||
if (map_request(tio, rq, md) == DM_MAPIO_REQUEUE) {
|
||||
/* Undo dm_start_request() before requeuing */
|
||||
rq_end_stats(md, rq);
|
||||
rq_completed(md, rq_data_dir(rq), false);
|
||||
return BLK_MQ_RQ_QUEUE_BUSY;
|
||||
}
|
||||
|
||||
return BLK_MQ_RQ_QUEUE_OK;
|
||||
}
|
||||
|
||||
static struct blk_mq_ops dm_mq_ops = {
|
||||
.queue_rq = dm_mq_queue_rq,
|
||||
.map_queue = blk_mq_map_queue,
|
||||
.complete = dm_softirq_done,
|
||||
.init_request = dm_mq_init_request,
|
||||
};
|
||||
|
||||
int dm_mq_init_request_queue(struct mapped_device *md, struct dm_target *immutable_tgt)
|
||||
{
|
||||
struct request_queue *q;
|
||||
int err;
|
||||
|
||||
if (dm_get_md_type(md) == DM_TYPE_REQUEST_BASED) {
|
||||
DMERR("request-based dm-mq may only be stacked on blk-mq device(s)");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
md->tag_set = kzalloc_node(sizeof(struct blk_mq_tag_set), GFP_KERNEL, md->numa_node_id);
|
||||
if (!md->tag_set)
|
||||
return -ENOMEM;
|
||||
|
||||
md->tag_set->ops = &dm_mq_ops;
|
||||
md->tag_set->queue_depth = dm_get_blk_mq_queue_depth();
|
||||
md->tag_set->numa_node = md->numa_node_id;
|
||||
md->tag_set->flags = BLK_MQ_F_SHOULD_MERGE | BLK_MQ_F_SG_MERGE;
|
||||
md->tag_set->nr_hw_queues = dm_get_blk_mq_nr_hw_queues();
|
||||
md->tag_set->driver_data = md;
|
||||
|
||||
md->tag_set->cmd_size = sizeof(struct dm_rq_target_io);
|
||||
if (immutable_tgt && immutable_tgt->per_io_data_size) {
|
||||
/* any target-specific per-io data is immediately after the tio */
|
||||
md->tag_set->cmd_size += immutable_tgt->per_io_data_size;
|
||||
md->init_tio_pdu = true;
|
||||
}
|
||||
|
||||
err = blk_mq_alloc_tag_set(md->tag_set);
|
||||
if (err)
|
||||
goto out_kfree_tag_set;
|
||||
|
||||
q = blk_mq_init_allocated_queue(md->tag_set, md->queue);
|
||||
if (IS_ERR(q)) {
|
||||
err = PTR_ERR(q);
|
||||
goto out_tag_set;
|
||||
}
|
||||
dm_init_md_queue(md);
|
||||
|
||||
/* backfill 'mq' sysfs registration normally done in blk_register_queue */
|
||||
blk_mq_register_disk(md->disk);
|
||||
|
||||
return 0;
|
||||
|
||||
out_tag_set:
|
||||
blk_mq_free_tag_set(md->tag_set);
|
||||
out_kfree_tag_set:
|
||||
kfree(md->tag_set);
|
||||
|
||||
return err;
|
||||
}
|
||||
|
||||
void dm_mq_cleanup_mapped_device(struct mapped_device *md)
|
||||
{
|
||||
if (md->tag_set) {
|
||||
blk_mq_free_tag_set(md->tag_set);
|
||||
kfree(md->tag_set);
|
||||
}
|
||||
}
|
||||
|
||||
module_param(reserved_rq_based_ios, uint, S_IRUGO | S_IWUSR);
|
||||
MODULE_PARM_DESC(reserved_rq_based_ios, "Reserved IOs in request-based mempools");
|
||||
|
||||
module_param(use_blk_mq, bool, S_IRUGO | S_IWUSR);
|
||||
MODULE_PARM_DESC(use_blk_mq, "Use block multiqueue for request-based DM devices");
|
||||
|
||||
module_param(dm_mq_nr_hw_queues, uint, S_IRUGO | S_IWUSR);
|
||||
MODULE_PARM_DESC(dm_mq_nr_hw_queues, "Number of hardware queues for request-based dm-mq devices");
|
||||
|
||||
module_param(dm_mq_queue_depth, uint, S_IRUGO | S_IWUSR);
|
||||
MODULE_PARM_DESC(dm_mq_queue_depth, "Queue depth for request-based dm-mq devices");
|
||||
64
drivers/md/dm-rq.h
Normal file
64
drivers/md/dm-rq.h
Normal file
@ -0,0 +1,64 @@
|
||||
/*
|
||||
* Internal header file for device mapper
|
||||
*
|
||||
* Copyright (C) 2016 Red Hat, Inc. All rights reserved.
|
||||
*
|
||||
* This file is released under the LGPL.
|
||||
*/
|
||||
|
||||
#ifndef DM_RQ_INTERNAL_H
|
||||
#define DM_RQ_INTERNAL_H
|
||||
|
||||
#include <linux/bio.h>
|
||||
#include <linux/kthread.h>
|
||||
|
||||
#include "dm-stats.h"
|
||||
|
||||
struct mapped_device;
|
||||
|
||||
/*
|
||||
* One of these is allocated per request.
|
||||
*/
|
||||
struct dm_rq_target_io {
|
||||
struct mapped_device *md;
|
||||
struct dm_target *ti;
|
||||
struct request *orig, *clone;
|
||||
struct kthread_work work;
|
||||
int error;
|
||||
union map_info info;
|
||||
struct dm_stats_aux stats_aux;
|
||||
unsigned long duration_jiffies;
|
||||
unsigned n_sectors;
|
||||
};
|
||||
|
||||
/*
|
||||
* For request-based dm - the bio clones we allocate are embedded in these
|
||||
* structs.
|
||||
*
|
||||
* We allocate these with bio_alloc_bioset, using the front_pad parameter when
|
||||
* the bioset is created - this means the bio has to come at the end of the
|
||||
* struct.
|
||||
*/
|
||||
struct dm_rq_clone_bio_info {
|
||||
struct bio *orig;
|
||||
struct dm_rq_target_io *tio;
|
||||
struct bio clone;
|
||||
};
|
||||
|
||||
bool dm_use_blk_mq_default(void);
|
||||
bool dm_use_blk_mq(struct mapped_device *md);
|
||||
|
||||
int dm_old_init_request_queue(struct mapped_device *md);
|
||||
int dm_mq_init_request_queue(struct mapped_device *md, struct dm_target *immutable_tgt);
|
||||
void dm_mq_cleanup_mapped_device(struct mapped_device *md);
|
||||
|
||||
void dm_start_queue(struct request_queue *q);
|
||||
void dm_stop_queue(struct request_queue *q);
|
||||
|
||||
unsigned dm_get_reserved_rq_based_ios(void);
|
||||
|
||||
ssize_t dm_attr_rq_based_seq_io_merge_deadline_show(struct mapped_device *md, char *buf);
|
||||
ssize_t dm_attr_rq_based_seq_io_merge_deadline_store(struct mapped_device *md,
|
||||
const char *buf, size_t count);
|
||||
|
||||
#endif
|
||||
@ -10,7 +10,7 @@
|
||||
#include <linux/module.h>
|
||||
#include <linux/device-mapper.h>
|
||||
|
||||
#include "dm.h"
|
||||
#include "dm-core.h"
|
||||
#include "dm-stats.h"
|
||||
|
||||
#define DM_MSG_PREFIX "stats"
|
||||
|
||||
@ -6,7 +6,8 @@
|
||||
|
||||
#include <linux/sysfs.h>
|
||||
#include <linux/dm-ioctl.h>
|
||||
#include "dm.h"
|
||||
#include "dm-core.h"
|
||||
#include "dm-rq.h"
|
||||
|
||||
struct dm_sysfs_attr {
|
||||
struct attribute attr;
|
||||
|
||||
@ -5,7 +5,7 @@
|
||||
* This file is released under the GPL.
|
||||
*/
|
||||
|
||||
#include "dm.h"
|
||||
#include "dm-core.h"
|
||||
|
||||
#include <linux/module.h>
|
||||
#include <linux/vmalloc.h>
|
||||
|
||||
@ -4,7 +4,7 @@
|
||||
* This file is released under the GPL.
|
||||
*/
|
||||
|
||||
#include "dm.h"
|
||||
#include "dm-core.h"
|
||||
|
||||
#include <linux/module.h>
|
||||
#include <linux/init.h>
|
||||
|
||||
1110
drivers/md/dm.c
1110
drivers/md/dm.c
File diff suppressed because it is too large
Load Diff
@ -13,6 +13,7 @@
|
||||
#include <linux/fs.h>
|
||||
#include <linux/device-mapper.h>
|
||||
#include <linux/list.h>
|
||||
#include <linux/moduleparam.h>
|
||||
#include <linux/blkdev.h>
|
||||
#include <linux/backing-dev.h>
|
||||
#include <linux/hdreg.h>
|
||||
@ -161,16 +162,6 @@ void dm_interface_exit(void);
|
||||
/*
|
||||
* sysfs interface
|
||||
*/
|
||||
struct dm_kobject_holder {
|
||||
struct kobject kobj;
|
||||
struct completion completion;
|
||||
};
|
||||
|
||||
static inline struct completion *dm_get_completion_from_kobject(struct kobject *kobj)
|
||||
{
|
||||
return &container_of(kobj, struct dm_kobject_holder, kobj)->completion;
|
||||
}
|
||||
|
||||
int dm_sysfs_init(struct mapped_device *md);
|
||||
void dm_sysfs_exit(struct mapped_device *md);
|
||||
struct kobject *dm_kobject(struct mapped_device *md);
|
||||
@ -212,8 +203,6 @@ int dm_kobject_uevent(struct mapped_device *md, enum kobject_action action,
|
||||
void dm_internal_suspend(struct mapped_device *md);
|
||||
void dm_internal_resume(struct mapped_device *md);
|
||||
|
||||
bool dm_use_blk_mq(struct mapped_device *md);
|
||||
|
||||
int dm_io_init(void);
|
||||
void dm_io_exit(void);
|
||||
|
||||
@ -228,18 +217,8 @@ struct dm_md_mempools *dm_alloc_md_mempools(struct mapped_device *md, unsigned t
|
||||
void dm_free_md_mempools(struct dm_md_mempools *pools);
|
||||
|
||||
/*
|
||||
* Helpers that are used by DM core
|
||||
* Various helpers
|
||||
*/
|
||||
unsigned dm_get_reserved_bio_based_ios(void);
|
||||
unsigned dm_get_reserved_rq_based_ios(void);
|
||||
|
||||
static inline bool dm_message_test_buffer_overflow(char *result, unsigned maxlen)
|
||||
{
|
||||
return !maxlen || strlen(result) + 1 >= maxlen;
|
||||
}
|
||||
|
||||
ssize_t dm_attr_rq_based_seq_io_merge_deadline_show(struct mapped_device *md, char *buf);
|
||||
ssize_t dm_attr_rq_based_seq_io_merge_deadline_store(struct mapped_device *md,
|
||||
const char *buf, size_t count);
|
||||
|
||||
#endif
|
||||
|
||||
Loading…
Reference in New Issue
Block a user