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zvol_os: fix compile with blk-mq on Linux 4.x #16069

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merged 1 commit into from
Apr 8, 2024
Merged

zvol_os: fix compile with blk-mq on Linux 4.x #16069

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15 changes: 15 additions & 0 deletions config/kernel-blk-queue.m4
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Original file line number Diff line number Diff line change
Expand Up @@ -377,13 +377,28 @@ AC_DEFUN([ZFS_AC_KERNEL_SRC_BLK_MQ], [
(void) blk_mq_alloc_tag_set(&tag_set);
return BLK_STS_OK;
], [])
ZFS_LINUX_TEST_SRC([blk_mq_rq_hctx], [
#include <linux/blk-mq.h>
#include <linux/blkdev.h>
], [
struct request rq = {0};
struct blk_mq_hw_ctx *hctx = NULL;
rq.mq_hctx = hctx;
], [])
])

AC_DEFUN([ZFS_AC_KERNEL_BLK_MQ], [
AC_MSG_CHECKING([whether block multiqueue with blk_status_t is available])
ZFS_LINUX_TEST_RESULT([blk_mq], [
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_BLK_MQ, 1, [block multiqueue is available])
AC_MSG_CHECKING([whether block multiqueue hardware context is cached in struct request])
ZFS_LINUX_TEST_RESULT([blk_mq_rq_hctx], [
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_BLK_MQ_RQ_HCTX, 1, [block multiqueue hardware context is cached in struct request])
], [
AC_MSG_RESULT(no)
])
], [
AC_MSG_RESULT(no)
])
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5 changes: 5 additions & 0 deletions module/os/linux/zfs/zvol_os.c
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Original file line number Diff line number Diff line change
Expand Up @@ -550,7 +550,12 @@ zvol_request_impl(zvol_state_t *zv, struct bio *bio, struct request *rq,
uint_t taskq_hash;
#ifdef HAVE_BLK_MQ
if (rq)
#ifdef HAVE_BLK_MQ_RQ_HCTX
blk_mq_hw_queue = rq->mq_hctx->queue_num;
#else
blk_mq_hw_queue =
rq->q->queue_hw_ctx[rq->q->mq_map[rq->cpu]]->queue_num;
#endif
#endif
taskq_hash = cityhash4((uintptr_t)zv, offset >> ZVOL_TASKQ_OFFSET_SHIFT,
blk_mq_hw_queue, 0);
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