From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andrey Zhadchenko Date: Tue, 18 Aug 2026 18:09:15 +0300 Subject: [Devel] [PATCH VZ10 0/5] vhost-blk: fix protocol handling and backend setup Message-ID: <20260818150920.13123-1-andrey.zhadchenko@virtuozzo.com> List-Id: This series fixes several vhost-blk bugs and harden some userspace interactions. First patch hardens VIRTIO_BLK_T_GET_ID. Leave the serial empty and copy the null terminator, just as QEMU. The second patch reports the correct used-ring length: the number of bytes written to the guest, including status. The third patch fixes flush. REQ_OP_FLUSH is not a valid bio op; use REQ_OP_WRITE | REQ_PREFLUSH as blkdev_issue_flush() does. The fourth patch fixes sector alignment checks. SECTOR_MASK is 7, not a bitmask, so the code was checking 8-byte alignment. Use (SECTOR_SIZE - 1). The last patch reworks queue/backend setup. vhost_blk_setup() silently ignored a changed vq->num once requests were allocated and double-fetched user input. Request allocation is now tied to backend existence, and drop_backend/flush/fput are consolidated. Andrey Zhadchenko (5): drivers/vhost/blk: harden get_id command drivers/vhost/blk: report correct used-ring lengths drivers/vhost/blk: fix flush support drivers/vhost/blk: fix sector alignment calculation drivers/vhost/blk: rework queue/backend setup drivers/vhost/blk.c | 162 ++++++++++++++++++++------------------------ 1 file changed, 74 insertions(+), 88 deletions(-) -- 2.43.5