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1616a4c2ab
For read cache missing, bcache defines a readahead size for the read I/O request to the backing device for the missing data. This readahead size is initialized to 0, and almost no one uses it to avoid unnecessary read amplifying onto backing device and write amplifying onto cache device. Considering upper layer file system code has readahead logic allready and works fine with readahead_cache_policy sysfile interface, we don't have to keep bcache self-defined readahead anymore. This patch removes the bcache self-defined readahead for cache missing request for backing device, and the readahead sysfs file interfaces are removed as well. This is the preparation for next patch to fix potential kernel panic due to oversized request in a simpler method. Reported-by: Alexander Ullrich <ealex1979@gmail.com> Reported-by: Diego Ercolani <diego.ercolani@gmail.com> Reported-by: Jan Szubiak <jan.szubiak@linuxpolska.pl> Reported-by: Marco Rebhan <me@dblsaiko.net> Reported-by: Matthias Ferdinand <bcache@mfedv.net> Reported-by: Victor Westerhuis <victor@westerhu.is> Reported-by: Vojtech Pavlik <vojtech@suse.cz> Reported-and-tested-by: Rolf Fokkens <rolf@rolffokkens.nl> Reported-and-tested-by: Thorsten Knabe <linux@thorsten-knabe.de> Signed-off-by: Coly Li <colyli@suse.de> Reviewed-by: Christoph Hellwig <hch@lst.de> Cc: stable@vger.kernel.org Cc: Kent Overstreet <kent.overstreet@gmail.com> Cc: Nix <nix@esperi.org.uk> Cc: Takashi Iwai <tiwai@suse.com> Link: https://lore.kernel.org/r/20210607125052.21277-2-colyli@suse.de Signed-off-by: Jens Axboe <axboe@kernel.dk>
64 lines
1.6 KiB
C
64 lines
1.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _BCACHE_STATS_H_
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#define _BCACHE_STATS_H_
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struct cache_stat_collector {
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atomic_t cache_hits;
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atomic_t cache_misses;
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atomic_t cache_bypass_hits;
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atomic_t cache_bypass_misses;
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atomic_t cache_miss_collisions;
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atomic_t sectors_bypassed;
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};
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struct cache_stats {
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struct kobject kobj;
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unsigned long cache_hits;
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unsigned long cache_misses;
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unsigned long cache_bypass_hits;
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unsigned long cache_bypass_misses;
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unsigned long cache_readaheads;
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unsigned long cache_miss_collisions;
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unsigned long sectors_bypassed;
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unsigned int rescale;
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};
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struct cache_accounting {
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struct closure cl;
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struct timer_list timer;
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atomic_t closing;
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struct cache_stat_collector collector;
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struct cache_stats total;
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struct cache_stats five_minute;
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struct cache_stats hour;
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struct cache_stats day;
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};
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struct cache_set;
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struct cached_dev;
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struct bcache_device;
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void bch_cache_accounting_init(struct cache_accounting *acc,
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struct closure *parent);
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int bch_cache_accounting_add_kobjs(struct cache_accounting *acc,
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struct kobject *parent);
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void bch_cache_accounting_clear(struct cache_accounting *acc);
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void bch_cache_accounting_destroy(struct cache_accounting *acc);
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void bch_mark_cache_accounting(struct cache_set *c, struct bcache_device *d,
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bool hit, bool bypass);
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void bch_mark_cache_readahead(struct cache_set *c, struct bcache_device *d);
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void bch_mark_cache_miss_collision(struct cache_set *c,
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struct bcache_device *d);
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void bch_mark_sectors_bypassed(struct cache_set *c,
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struct cached_dev *dc,
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int sectors);
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#endif /* _BCACHE_STATS_H_ */
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