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linux-next/drivers/md/dm-zoned.h
Dmitry Fomichev e7fad909b6 dm zoned: reduce overhead of backing device checks 
Commit 75d66ffb48 added backing device health checks and as a part
of these checks, check_events() block ops template call is invoked in
dm-zoned mapping path as well as in reclaim and flush path. Calling
check_events() with ATA or SCSI backing devices introduces a blocking
scsi_test_unit_ready() call being made in sd_check_events(). Even though
the overhead of calling scsi_test_unit_ready() is small for ATA zoned
devices, it is much larger for SCSI and it affects performance in a very
negative way.

Fix this performance regression by executing check_events() only in case
of any I/O errors. The function dmz_bdev_is_dying() is modified to call
only blk_queue_dying(), while calls to check_events() are made in a new
helper function, dmz_check_bdev().

Reported-by: zhangxiaoxu <zhangxiaoxu5@huawei.com>
Fixes: 75d66ffb48 ("dm zoned: properly handle backing device failure")
Cc: stable@vger.kernel.org
Signed-off-by: Dmitry Fomichev <dmitry.fomichev@wdc.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
2019-11-07 10:08:36 -05:00

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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (C) 2017 Western Digital Corporation or its affiliates.
*
* This file is released under the GPL.
*/
#ifndef DM_ZONED_H
#define DM_ZONED_H
#include <linux/types.h>
#include <linux/blkdev.h>
#include <linux/device-mapper.h>
#include <linux/dm-kcopyd.h>
#include <linux/list.h>
#include <linux/spinlock.h>
#include <linux/mutex.h>
#include <linux/workqueue.h>
#include <linux/rwsem.h>
#include <linux/rbtree.h>
#include <linux/radix-tree.h>
#include <linux/shrinker.h>
/*
* dm-zoned creates block devices with 4KB blocks, always.
*/
#define DMZ_BLOCK_SHIFT 12
#define DMZ_BLOCK_SIZE (1 << DMZ_BLOCK_SHIFT)
#define DMZ_BLOCK_MASK (DMZ_BLOCK_SIZE - 1)
#define DMZ_BLOCK_SHIFT_BITS (DMZ_BLOCK_SHIFT + 3)
#define DMZ_BLOCK_SIZE_BITS (1 << DMZ_BLOCK_SHIFT_BITS)
#define DMZ_BLOCK_MASK_BITS (DMZ_BLOCK_SIZE_BITS - 1)
#define DMZ_BLOCK_SECTORS_SHIFT (DMZ_BLOCK_SHIFT - SECTOR_SHIFT)
#define DMZ_BLOCK_SECTORS (DMZ_BLOCK_SIZE >> SECTOR_SHIFT)
#define DMZ_BLOCK_SECTORS_MASK (DMZ_BLOCK_SECTORS - 1)
/*
* 4KB block <-> 512B sector conversion.
*/
#define dmz_blk2sect(b) ((sector_t)(b) << DMZ_BLOCK_SECTORS_SHIFT)
#define dmz_sect2blk(s) ((sector_t)(s) >> DMZ_BLOCK_SECTORS_SHIFT)
#define dmz_bio_block(bio) dmz_sect2blk((bio)->bi_iter.bi_sector)
#define dmz_bio_blocks(bio) dmz_sect2blk(bio_sectors(bio))
/*
* Zoned block device information.
*/
struct dmz_dev {
struct block_device *bdev;
char name[BDEVNAME_SIZE];
sector_t capacity;
unsigned int nr_zones;
unsigned int flags;
sector_t zone_nr_sectors;
unsigned int zone_nr_sectors_shift;
sector_t zone_nr_blocks;
sector_t zone_nr_blocks_shift;
};
#define dmz_bio_chunk(dev, bio) ((bio)->bi_iter.bi_sector >> \
(dev)->zone_nr_sectors_shift)
#define dmz_chunk_block(dev, b) ((b) & ((dev)->zone_nr_blocks - 1))
/* Device flags. */
#define DMZ_BDEV_DYING (1 << 0)
#define DMZ_CHECK_BDEV (2 << 0)
/*
* Zone descriptor.
*/
struct dm_zone {
/* For listing the zone depending on its state */
struct list_head link;
/* Zone type and state */
unsigned long flags;
/* Zone activation reference count */
atomic_t refcount;
/* Zone write pointer block (relative to the zone start block) */
unsigned int wp_block;
/* Zone weight (number of valid blocks in the zone) */
unsigned int weight;
/* The chunk that the zone maps */
unsigned int chunk;
/*
* For a sequential data zone, pointer to the random zone
* used as a buffer for processing unaligned writes.
* For a buffer zone, this points back to the data zone.
*/
struct dm_zone *bzone;
};
/*
* Zone flags.
*/
enum {
/* Zone write type */
DMZ_RND,
DMZ_SEQ,
/* Zone critical condition */
DMZ_OFFLINE,
DMZ_READ_ONLY,
/* How the zone is being used */
DMZ_META,
DMZ_DATA,
DMZ_BUF,
/* Zone internal state */
DMZ_RECLAIM,
DMZ_SEQ_WRITE_ERR,
};
/*
* Zone data accessors.
*/
#define dmz_is_rnd(z) test_bit(DMZ_RND, &(z)->flags)
#define dmz_is_seq(z) test_bit(DMZ_SEQ, &(z)->flags)
#define dmz_is_empty(z) ((z)->wp_block == 0)
#define dmz_is_offline(z) test_bit(DMZ_OFFLINE, &(z)->flags)
#define dmz_is_readonly(z) test_bit(DMZ_READ_ONLY, &(z)->flags)
#define dmz_in_reclaim(z) test_bit(DMZ_RECLAIM, &(z)->flags)
#define dmz_seq_write_err(z) test_bit(DMZ_SEQ_WRITE_ERR, &(z)->flags)
#define dmz_is_meta(z) test_bit(DMZ_META, &(z)->flags)
#define dmz_is_buf(z) test_bit(DMZ_BUF, &(z)->flags)
#define dmz_is_data(z) test_bit(DMZ_DATA, &(z)->flags)
#define dmz_weight(z) ((z)->weight)
/*
* Message functions.
*/
#define dmz_dev_info(dev, format, args...) \
DMINFO("(%s): " format, (dev)->name, ## args)
#define dmz_dev_err(dev, format, args...) \
DMERR("(%s): " format, (dev)->name, ## args)
#define dmz_dev_warn(dev, format, args...) \
DMWARN("(%s): " format, (dev)->name, ## args)
#define dmz_dev_debug(dev, format, args...) \
DMDEBUG("(%s): " format, (dev)->name, ## args)
struct dmz_metadata;
struct dmz_reclaim;
/*
* Functions defined in dm-zoned-metadata.c
*/
int dmz_ctr_metadata(struct dmz_dev *dev, struct dmz_metadata **zmd);
void dmz_dtr_metadata(struct dmz_metadata *zmd);
int dmz_resume_metadata(struct dmz_metadata *zmd);
void dmz_lock_map(struct dmz_metadata *zmd);
void dmz_unlock_map(struct dmz_metadata *zmd);
void dmz_lock_metadata(struct dmz_metadata *zmd);
void dmz_unlock_metadata(struct dmz_metadata *zmd);
void dmz_lock_flush(struct dmz_metadata *zmd);
void dmz_unlock_flush(struct dmz_metadata *zmd);
int dmz_flush_metadata(struct dmz_metadata *zmd);
unsigned int dmz_id(struct dmz_metadata *zmd, struct dm_zone *zone);
sector_t dmz_start_sect(struct dmz_metadata *zmd, struct dm_zone *zone);
sector_t dmz_start_block(struct dmz_metadata *zmd, struct dm_zone *zone);
unsigned int dmz_nr_chunks(struct dmz_metadata *zmd);
#define DMZ_ALLOC_RND 0x01
#define DMZ_ALLOC_RECLAIM 0x02
struct dm_zone *dmz_alloc_zone(struct dmz_metadata *zmd, unsigned long flags);
void dmz_free_zone(struct dmz_metadata *zmd, struct dm_zone *zone);
void dmz_map_zone(struct dmz_metadata *zmd, struct dm_zone *zone,
unsigned int chunk);
void dmz_unmap_zone(struct dmz_metadata *zmd, struct dm_zone *zone);
unsigned int dmz_nr_rnd_zones(struct dmz_metadata *zmd);
unsigned int dmz_nr_unmap_rnd_zones(struct dmz_metadata *zmd);
/*
* Activate a zone (increment its reference count).
*/
static inline void dmz_activate_zone(struct dm_zone *zone)
{
atomic_inc(&zone->refcount);
}
/*
* Deactivate a zone. This decrement the zone reference counter
* indicating that all BIOs to the zone have completed when the count is 0.
*/
static inline void dmz_deactivate_zone(struct dm_zone *zone)
{
atomic_dec(&zone->refcount);
}
/*
* Test if a zone is active, that is, has a refcount > 0.
*/
static inline bool dmz_is_active(struct dm_zone *zone)
{
return atomic_read(&zone->refcount);
}
int dmz_lock_zone_reclaim(struct dm_zone *zone);
void dmz_unlock_zone_reclaim(struct dm_zone *zone);
struct dm_zone *dmz_get_zone_for_reclaim(struct dmz_metadata *zmd);
struct dm_zone *dmz_get_chunk_mapping(struct dmz_metadata *zmd,
unsigned int chunk, int op);
void dmz_put_chunk_mapping(struct dmz_metadata *zmd, struct dm_zone *zone);
struct dm_zone *dmz_get_chunk_buffer(struct dmz_metadata *zmd,
struct dm_zone *dzone);
int dmz_validate_blocks(struct dmz_metadata *zmd, struct dm_zone *zone,
sector_t chunk_block, unsigned int nr_blocks);
int dmz_invalidate_blocks(struct dmz_metadata *zmd, struct dm_zone *zone,
sector_t chunk_block, unsigned int nr_blocks);
int dmz_block_valid(struct dmz_metadata *zmd, struct dm_zone *zone,
sector_t chunk_block);
int dmz_first_valid_block(struct dmz_metadata *zmd, struct dm_zone *zone,
sector_t *chunk_block);
int dmz_copy_valid_blocks(struct dmz_metadata *zmd, struct dm_zone *from_zone,
struct dm_zone *to_zone);
int dmz_merge_valid_blocks(struct dmz_metadata *zmd, struct dm_zone *from_zone,
struct dm_zone *to_zone, sector_t chunk_block);
/*
* Functions defined in dm-zoned-reclaim.c
*/
int dmz_ctr_reclaim(struct dmz_dev *dev, struct dmz_metadata *zmd,
struct dmz_reclaim **zrc);
void dmz_dtr_reclaim(struct dmz_reclaim *zrc);
void dmz_suspend_reclaim(struct dmz_reclaim *zrc);
void dmz_resume_reclaim(struct dmz_reclaim *zrc);
void dmz_reclaim_bio_acc(struct dmz_reclaim *zrc);
void dmz_schedule_reclaim(struct dmz_reclaim *zrc);
/*
* Functions defined in dm-zoned-target.c
*/
bool dmz_bdev_is_dying(struct dmz_dev *dmz_dev);
bool dmz_check_bdev(struct dmz_dev *dmz_dev);
#endif /* DM_ZONED_H */
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