bcache: use REQ_PRIO to indicate bio for metadata
In cached_dev_cache_miss() and check_should_bypass(), REQ_META is used to check whether a bio is for metadata request. REQ_META is used for blktrace, the correct REQ_ flag should be REQ_PRIO. This flag means the bio should be prior to other bio, and frequently be used to indicate metadata io in file system code. This patch replaces REQ_META with correct flag REQ_PRIO. CC Adam Manzanares because he explains to me what REQ_PRIO is for. Signed-off-by: Coly Li <colyli@suse.de> Cc: Adam Manzanares <adam.manzanares@wdc.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
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502b291568
Коммит
752f66a75a
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@ -395,7 +395,7 @@ static bool check_should_bypass(struct cached_dev *dc, struct bio *bio)
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* unless the read-ahead request is for metadata (eg, for gfs2).
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* unless the read-ahead request is for metadata (eg, for gfs2).
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*/
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*/
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if (bio->bi_opf & (REQ_RAHEAD|REQ_BACKGROUND) &&
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if (bio->bi_opf & (REQ_RAHEAD|REQ_BACKGROUND) &&
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!(bio->bi_opf & REQ_META))
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!(bio->bi_opf & REQ_PRIO))
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goto skip;
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goto skip;
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if (bio->bi_iter.bi_sector & (c->sb.block_size - 1) ||
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if (bio->bi_iter.bi_sector & (c->sb.block_size - 1) ||
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@ -877,7 +877,7 @@ static int cached_dev_cache_miss(struct btree *b, struct search *s,
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}
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}
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if (!(bio->bi_opf & REQ_RAHEAD) &&
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if (!(bio->bi_opf & REQ_RAHEAD) &&
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!(bio->bi_opf & REQ_META) &&
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!(bio->bi_opf & REQ_PRIO) &&
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s->iop.c->gc_stats.in_use < CUTOFF_CACHE_READA)
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s->iop.c->gc_stats.in_use < CUTOFF_CACHE_READA)
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reada = min_t(sector_t, dc->readahead >> 9,
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reada = min_t(sector_t, dc->readahead >> 9,
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get_capacity(bio->bi_disk) - bio_end_sector(bio));
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get_capacity(bio->bi_disk) - bio_end_sector(bio));
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