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btrfs: look at bi_size for repair decisions

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bio_readpage_error currently uses bi_vcnt to decide if it is worth
retrying an I/O.  But the vector count is mostly an implementation
artifact - it really should figure out if there is more than a
single sector worth retrying.  Use bi_size for that and shift by
PAGE_SHIFT.  This really should be blocks/sectors, but given that
btrfs doesn't support a sector size different from the PAGE_SIZE
using the page size keeps the changes to a minimum.

Reviewed-by: Omar Sandoval <osandov@fb.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2019-02-15 19:13:07 +08:00 committed by Jens Axboe
parent fbd72127c9
commit 8a2ee44a37
2 changed files with 1 additions and 7 deletions
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2
fs/btrfs/extent_io.c
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@ -2350,7 +2350,7 @@ static int bio_readpage_error(struct bio *failed_bio, u64 phy_offset,
int read_mode = 0;
blk_status_t status;
int ret;
unsigned failed_bio_pages = bio_pages_all(failed_bio);
unsigned failed_bio_pages = failed_bio->bi_iter.bi_size >> PAGE_SHIFT;
BUG_ON(bio_op(failed_bio) == REQ_OP_WRITE);

6
include/linux/bio.h
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@ -263,12 +263,6 @@ static inline void bio_get_last_bvec(struct bio *bio, struct bio_vec *bv)
bv->bv_len = iter.bi_bvec_done;
}
static inline unsigned bio_pages_all(struct bio *bio)
{
WARN_ON_ONCE(bio_flagged(bio, BIO_CLONED));
return bio->bi_vcnt;
}
static inline struct bio_vec *bio_first_bvec_all(struct bio *bio)
{
WARN_ON_ONCE(bio_flagged(bio, BIO_CLONED));