diff options
author | Ming Lei <ming.lei@redhat.com> | 2020-01-05 09:41:14 +0800 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-01-17 19:48:21 +0100 |
commit | 3fe209c8432b829a605c5b7c932d39469c25277d (patch) | |
tree | e09f61e75701f609aa7d5e6edc6368234a9b88aa /block | |
parent | 80a332f418585c817446dee19112527ad78063c0 (diff) |
fs: move guard_bio_eod() after bio_set_op_attrs
commit 83c9c547168e8b914ea6398430473a4de68c52cc upstream.
Commit 85a8ce62c2ea ("block: add bio_truncate to fix guard_bio_eod")
adds bio_truncate() for handling bio EOD. However, bio_truncate()
doesn't use the passed 'op' parameter from guard_bio_eod's callers.
So bio_trunacate() may retrieve wrong 'op', and zering pages may
not be done for READ bio.
Fixes this issue by moving guard_bio_eod() after bio_set_op_attrs()
in submit_bh_wbc() so that bio_truncate() can always retrieve correct
op info.
Meantime remove the 'op' parameter from guard_bio_eod() because it isn't
used any more.
Cc: Carlos Maiolino <cmaiolino@redhat.com>
Cc: linux-fsdevel@vger.kernel.org
Fixes: 85a8ce62c2ea ("block: add bio_truncate to fix guard_bio_eod")
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Fold in kerneldoc and bio_op() change.
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block')
-rw-r--r-- | block/bio.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/block/bio.c b/block/bio.c index c822ceb7c4de..906da3581a3e 100644 --- a/block/bio.c +++ b/block/bio.c @@ -535,6 +535,16 @@ void zero_fill_bio_iter(struct bio *bio, struct bvec_iter start) } EXPORT_SYMBOL(zero_fill_bio_iter); +/** + * bio_truncate - truncate the bio to small size of @new_size + * @bio: the bio to be truncated + * @new_size: new size for truncating the bio + * + * Description: + * Truncate the bio to new size of @new_size. If bio_op(bio) is + * REQ_OP_READ, zero the truncated part. This function should only + * be used for handling corner cases, such as bio eod. + */ void bio_truncate(struct bio *bio, unsigned new_size) { struct bio_vec bv; @@ -545,7 +555,7 @@ void bio_truncate(struct bio *bio, unsigned new_size) if (new_size >= bio->bi_iter.bi_size) return; - if (bio_data_dir(bio) != READ) + if (bio_op(bio) != REQ_OP_READ) goto exit; bio_for_each_segment(bv, bio, iter) { |