From: Liu Bo Date: Sat, 13 Jan 2018 01:07:01 +0000 (-0700) Subject: Btrfs: raid56: iterate raid56 internal bio with bio_for_each_segment_all X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=d16919a3fe2d83ae159b82808933fefb54fc2f6e;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git Btrfs: raid56: iterate raid56 internal bio with bio_for_each_segment_all commit 0198e5b707cfeb5defbd1b71b1ec6e71580d7db9 upstream. Bio iterated by set_bio_pages_uptodate() is raid56 internal one, so it will never be a BIO_CLONED bio, and since this is called by end_io functions, bio->bi_iter.bi_size is zero, we mustn't use bio_for_each_segment() as that is a no-op if bi_size is zero. Fixes: 6592e58c6b68e61f003a01ba29a3716e7e2e9484 ("Btrfs: fix write corruption due to bio cloning on raid5/6") Signed-off-by: Liu Bo Signed-off-by: David Sterba Signed-off-by: Greg Kroah-Hartman --- diff --git a/fs/btrfs/raid56.c b/fs/btrfs/raid56.c index 24a62224b24b..6154825c30e1 100644 --- a/fs/btrfs/raid56.c +++ b/fs/btrfs/raid56.c @@ -1432,14 +1432,13 @@ static int fail_bio_stripe(struct btrfs_raid_bio *rbio, */ static void set_bio_pages_uptodate(struct bio *bio) { - struct bio_vec bvec; - struct bvec_iter iter; + struct bio_vec *bvec; + int i; - if (bio_flagged(bio, BIO_CLONED)) - bio->bi_iter = btrfs_io_bio(bio)->iter; + ASSERT(!bio_flagged(bio, BIO_CLONED)); - bio_for_each_segment(bvec, bio, iter) - SetPageUptodate(bvec.bv_page); + bio_for_each_segment_all(bvec, bio, i) + SetPageUptodate(bvec->bv_page); } /*