queue_flag_{set,clear}_unlocked are now private

queue_flag_{set,clear}_unlocked are now private interfaces in
the Linux kernel (torvalds/linux@8a0ac14).
Use blk_queue_flag_{set,clear} interfaces which were introduced as
of torvalds/linux@8814ce8.

Signed-off-by: Giuseppe Di Natale <dinatale2@llnl.gov>
Requires-builders: style build

config/kernel-blk-queue-flags.m4

@@ -0,0 +1,32 @@
+AC_DEFUN([ZFS_AC_KERNEL_BLK_QUEUE_FLAG_SET], [
+	AC_MSG_CHECKING([whether blk_queue_flag_set() exists])
+	ZFS_LINUX_TRY_COMPILE([
+		#include <linux/kernel.h>
+		#include <linux/blkdev.h>
+	],[
+		struct request_queue *q = NULL;
+		blk_queue_flag_set(0, q);
+	],[
+		AC_MSG_RESULT(yes)
+		AC_DEFINE(HAVE_BLK_QUEUE_FLAG_SET, 1, [blk_queue_flag_set() exists])
+	],[
+		AC_MSG_RESULT(no)
+	])
+])
+
+AC_DEFUN([ZFS_AC_KERNEL_BLK_QUEUE_FLAG_CLEAR], [
+	AC_MSG_CHECKING([whether blk_queue_flag_clear() exists])
+	ZFS_LINUX_TRY_COMPILE([
+		#include <linux/kernel.h>
+		#include <linux/blkdev.h>
+	],[
+		struct request_queue *q = NULL;
+		blk_queue_flag_clear(0, q);
+	],[
+
+		AC_MSG_RESULT(yes)
+		AC_DEFINE(HAVE_BLK_QUEUE_FLAG_CLEAR, 1, [blk_queue_flag_clear() exists])
+	],[
+		AC_MSG_RESULT(no)
+	])
+])

config/kernel.m4

@@ -36,6 +36,8 @@ AC_DEFUN([ZFS_AC_CONFIG_KERNEL], [
 	ZFS_AC_KERNEL_BIO_RW_BARRIER
 	ZFS_AC_KERNEL_BIO_RW_DISCARD
 	ZFS_AC_KERNEL_BLK_QUEUE_BDI
+	ZFS_AC_KERNEL_BLK_QUEUE_FLAG_CLEAR
+	ZFS_AC_KERNEL_BLK_QUEUE_FLAG_SET
 	ZFS_AC_KERNEL_BLK_QUEUE_FLUSH
 	ZFS_AC_KERNEL_BLK_QUEUE_MAX_HW_SECTORS
 	ZFS_AC_KERNEL_BLK_QUEUE_MAX_SEGMENTS

include/linux/blkdev_compat.h

@@ -37,6 +37,22 @@
 typedef unsigned __bitwise__ fmode_t;
 #endif /* HAVE_FMODE_T */
 
+#ifndef HAVE_BLK_QUEUE_FLAG_SET
+static inline void
+blk_queue_flag_set(unsigned int flag, struct request_queue *q)
+{
+	queue_flag_set_unlocked(flag, q);
+}
+#endif
+
+#ifndef HAVE_BLK_QUEUE_FLAG_CLEAR
+static inline void
+blk_queue_flag_clear(unsigned int flag, struct request_queue *q)
+{
+	queue_flag_clear_unlocked(flag, q);
+}
+#endif
+
 /*
  * 4.7 - 4.x API,
  * The blk_queue_write_cache() interface has replaced blk_queue_flush()

module/zfs/zvol.c

@@ -1696,7 +1696,7 @@ zvol_alloc(dev_t dev, const char *name)
 	blk_queue_set_read_ahead(zv->zv_queue, 1);
 
 	/* Disable write merging in favor of the ZIO pipeline. */
-	queue_flag_set_unlocked(QUEUE_FLAG_NOMERGES, zv->zv_queue);
+	blk_queue_flag_set(QUEUE_FLAG_NOMERGES, zv->zv_queue);
 
 	zv->zv_disk = alloc_disk(ZVOL_MINORS);
 	if (zv->zv_disk == NULL)
@@ -1847,12 +1847,12 @@ zvol_create_minor_impl(const char *name)
 	blk_queue_max_discard_sectors(zv->zv_queue,
 	    (zvol_max_discard_blocks * zv->zv_volblocksize) >> 9);
 	blk_queue_discard_granularity(zv->zv_queue, zv->zv_volblocksize);
-	queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, zv->zv_queue);
+	blk_queue_flag_set(QUEUE_FLAG_DISCARD, zv->zv_queue);
 #ifdef QUEUE_FLAG_NONROT
-	queue_flag_set_unlocked(QUEUE_FLAG_NONROT, zv->zv_queue);
+	blk_queue_flag_set(QUEUE_FLAG_NONROT, zv->zv_queue);
 #endif
 #ifdef QUEUE_FLAG_ADD_RANDOM
-	queue_flag_clear_unlocked(QUEUE_FLAG_ADD_RANDOM, zv->zv_queue);
+	blk_queue_flag_clear(QUEUE_FLAG_ADD_RANDOM, zv->zv_queue);
 #endif
 
 	if (spa_writeable(dmu_objset_spa(os))) {