[Devel] [PATCH RHEL8 COMMIT] ploop: Make fsync work be able to run in parallel with main work

[Konstantin Khorenko]

The commit is pushed to "branch-rh8-4.18.0-240.1.1.vz8.5.x-ovz" and will appear at https://src.openvz.org/scm/ovz/vzkernel.git
after rh8-4.18.0-240.1.1.vz8.5.44
------>
commit 9f0138d3e3ee35a6f7a393985ee40bc65ef98312
Author: Kirill Tkhai <ktkhai at virtuozzo.com>
Date:   Thu Jun 17 19:01:07 2021 +0300

    ploop: Make fsync work be able to run in parallel with main work
    
    This should improve performace. Also, this is required
    for next patch.
    
    Signed-off-by: Kirill Tkhai <ktkhai at virtuozzo.com>
    
    =====================
    Patchset description:
    
    ploop: Allow to resubmit partially completed request
    
    This allows to continue submitting partially completed requests.
    
    https://jira.sw.ru/browse/PSBM-127225
    
    Kirill Tkhai (18):
          ploop: Simplify ploop_write_cluster_sync()
          ploop: Rename hook->pio, h->pio, ploop_cow::hook->aux_pio
          ploop: Rename force_link_inflight_bios
          ploop: Introduce separate lock for inflight pios
          ploop: Use hlist instead of rbtree
          ploop: Always link submitted pios
          ploop: Unexport ploop_inflight_bios_ref_switch()
          ploop: Refactor submit_pio()
          ploop: Introduce ploop_suspend_submitting_pios
          ploop: Refactor ploop_ctr()
          ploop: Use ploop_call_rw_iter() in submit_delta_read()
          ploop: Generalize submit_rw_mapped()
          ploop: Kill submit_delta_read()
          ploop: Rename submit_rw_mapped()
          ploop: Extract submit_rw_mapped() to separate function
          ploop: Save level before submitting pio
          ploop: Make fsync work be able to run in parallel with main work
          ploop: Introduce resubmitting partially completed pios
    
    Signed-off-by: Kirill Tkhai <ktkhai at virtuozzo.com>
---
 drivers/md/dm-ploop-target.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/md/dm-ploop-target.c b/drivers/md/dm-ploop-target.c
index aa6b576b93b1..9e173f5d8d0c 100644
--- a/drivers/md/dm-ploop-target.c
+++ b/drivers/md/dm-ploop-target.c
@@ -279,6 +279,7 @@ static int ploop_ctr(struct dm_target *ti, unsigned int argc, char **argv)
 {
 	percpu_ref_func_t *release;
 	struct ploop *ploop;
+	unsigned int flags;
 	int i, ret;
 
 	if (argc < 2)
@@ -325,7 +326,8 @@ static int ploop_ctr(struct dm_target *ti, unsigned int argc, char **argv)
 		}
 	}
 
-	ploop->wq = alloc_ordered_workqueue("dm-" DM_MSG_PREFIX, WQ_MEM_RECLAIM);
+	flags = WQ_MEM_RECLAIM|WQ_HIGHPRI|WQ_UNBOUND;
+	ploop->wq = alloc_workqueue("dm-" DM_MSG_PREFIX, flags, 0);
 	if (!ploop->wq) {
 		ret = -ENOMEM;
 		goto err;