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bio-integrity: Drop bio_integrity_verify BUG_ON in post bip->bip_iter world 

Given that bip->bip_iter.bi_size is decremented after bio_advance() ->
bio_integrity_advance() is called, the BUG_ON() in bio_integrity_verify()
ends up tripping in v3.14-rc1 code with the advent of immutable biovecs
in:

commit d57a5f7c66
Author: Kent Overstreet <kmo@daterainc.com>
Date:   Sat Nov 23 17:20:16 2013 -0800

    bio-integrity: Convert to bvec_iter

Given that there is no easy way to ascertain the original bi_size
value, go ahead and drop this BUG_ON().

Reported-by: Sagi Grimberg <sagig@dev.mellanox.co.il>
Reported-by: Akinobu Mita <akinobu.mita@gmail.com>
Acked-by: Martin K. Petersen <martin.petersen@oracle.com>
Cc: Kent Overstreet <kmo@daterainc.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Nicholas Bellinger 2014-02-20 00:52:01 +00:00 committed by Jens Axboe
parent d6a25b3131
commit eec70897d8
1 changed files with 1 additions and 4 deletions
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5
fs/bio-integrity.c
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@ -458,11 +458,10 @@ static int bio_integrity_verify(struct bio *bio)
struct blk_integrity_exchg bix;
struct bio_vec *bv;
sector_t sector = bio->bi_integrity->bip_iter.bi_sector;
unsigned int sectors, total, ret;
unsigned int sectors, ret = 0;
void *prot_buf = bio->bi_integrity->bip_buf;
int i;
ret = total = 0;
bix.disk_name = bio->bi_bdev->bd_disk->disk_name;
bix.sector_size = bi->sector_size;
@ -484,8 +483,6 @@ static int bio_integrity_verify(struct bio *bio)
sectors = bv->bv_len / bi->sector_size;
sector += sectors;
prot_buf += sectors * bi->tuple_size;
total += sectors * bi->tuple_size;
BUG_ON(total > bio->bi_integrity->bip_iter.bi_size);
kunmap_atomic(kaddr);
}