From mboxrd@z Thu Jan 1 00:00:00 1970 From: Konstantin Khorenko Date: Tue, 25 Aug 2026 12:41:54 +0200 Subject: [Devel] [PATCH RHEL10 COMMIT] dm-qcow2: fix lower delta seek window clamp In-Reply-To: <20260819000745.28823-2-andrey.zhadchenko@virtuozzo.com> Message-ID: <202608251041.67PAfs1E774731@f0.sw.ru> List-Id: The commit is pushed to "branch-rh10-6.12.0-211.39.1.16.x.vz10-ovz" and will appear at git at bitbucket.org:openvz/vzkernel.git after rh10-6.12.0-211.39.1.16.9.vz10 ------> commit fde033dabdab8ffa4e3c21fc692029c165cd2a4b Author: Andrey Zhadchenko Date: Wed Aug 19 03:07:39 2026 +0300 dm-qcow2: fix lower delta seek window clamp size may be smaller than old_qio->bi_iter.bi_size: we calculate it beforehand with calc_front_qio_bytes(). https://virtuozzo.atlassian.net/browse/VSTOR-139407 Feature: dm-qcow2: block device over QCOW2 files driver Signed-off-by: Andrey Zhadchenko Reviewed-by: Pavel Tikhomirov Reviewed-by: Vasileios Almpanis --- drivers/md/dm-qcow2-map.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/drivers/md/dm-qcow2-map.c b/drivers/md/dm-qcow2-map.c index db21efb45e17a..542c7949321e5 100644 --- a/drivers/md/dm-qcow2-map.c +++ b/drivers/md/dm-qcow2-map.c @@ -4437,12 +4437,11 @@ static inline void seek_qio_next_clu(struct qio *qio, struct qcow2_map *map) static struct qio *advance_and_spawn_lower_seek_qio(struct qio *old_qio, u32 size) { struct qio *new_qio; - loff_t start, old_end; + loff_t start; start = to_bytes(old_qio->bi_iter.bi_sector); - old_end = start + old_qio->bi_iter.bi_size; - if (old_end > old_qio->qcow2->lower->hdr.size) + if (start + size > old_qio->qcow2->lower->hdr.size) size = old_qio->qcow2->lower->hdr.size - start; new_qio = alloc_seek_qio(old_qio->qcow2->lower, old_qio, start + size);