[Devel] [PATCH RH9 07/22] fs: Lower ioprio in case of ioprio_set() called from CT

[Andrey Zhadchenko]

From: Kirill Tkhai <ktkhai at virtuozzo.com>

Extracted from "Initial patch".

Signed-off-by: Kirill Tkhai <ktkhai at virtuozzo.com>

=====================================================================
Removed UBC-related code.

VZ 8 rebase part https://jira.sw.ru/browse/PSBM-127782
vz7 commit: aad7bef ("fs: Lower ioprio in case of ioprio_set() called
from CT")

Signed-off-by: Alexander Mikhalitsyn <alexander.mikhalitsyn at virtuozzo.com>

(cherry picked from vz8 commit 9cf6b4dffd4f12698f8ada7587aed977c70b439e)
Signed-off-by: Andrey Zhadchenko <andrey.zhadchenko at virtuozzo.com>
---
 block/ioprio.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/block/ioprio.c b/block/ioprio.c
index 06b1b03..6820e2f 100644
--- a/block/ioprio.c
+++ b/block/ioprio.c
@@ -98,11 +98,27 @@ int ioprio_check_cap(int ioprio)
 	struct pid *pgrp;
 	kuid_t uid;
 	int ret;
+	int class = IOPRIO_PRIO_CLASS(ioprio);
+	int data = IOPRIO_PRIO_DATA(ioprio);
 
 	ret = ioprio_check_cap(ioprio);
 	if (ret)
 		return ret;
 
+	if (!ve_is_super(get_exec_env())) {
+		switch (class) {
+			case IOPRIO_CLASS_RT:
+				class = IOPRIO_CLASS_BE;
+				data = 0;
+				break;
+			case IOPRIO_CLASS_IDLE:
+				class = IOPRIO_CLASS_BE;
+				data = IOPRIO_BE_NR - 1;
+				break;
+		}
+		ioprio = IOPRIO_PRIO_VALUE(class, data);
+	}
+
 	ret = -ESRCH;
 	rcu_read_lock();
 	switch (which) {
-- 
1.8.3.1