[PATCH 16/18] btrfs: use a per-superblock fsverity workqueue

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From: Darrick J. Wong <djwong@xxxxxxxxxx>

Switch btrfs to use a per-sb fsverity workqueue instead of a systemwide
workqueue.

Signed-off-by: Darrick J. Wong <djwong@xxxxxxxxxx>
---
 fs/btrfs/super.c |   14 ++++++++++++++
 1 file changed, 14 insertions(+)


diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index 7e44ccaf348f2..937f0491c01e5 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -28,6 +28,7 @@
 #include <linux/btrfs.h>
 #include <linux/security.h>
 #include <linux/fs_parser.h>
+#include <linux/fsverity.h>
 #include "messages.h"
 #include "delayed-inode.h"
 #include "ctree.h"
@@ -924,6 +925,19 @@ static int btrfs_fill_super(struct super_block *sb,
 	sb->s_export_op = &btrfs_export_ops;
 #ifdef CONFIG_FS_VERITY
 	sb->s_vop = &btrfs_verityops;
+	/*
+	 * Use a high-priority workqueue to prioritize verification work, which
+	 * blocks reads from completing, over regular application tasks.
+	 *
+	 * For performance reasons, don't use an unbound workqueue.  Using an
+	 * unbound workqueue for crypto operations causes excessive scheduler
+	 * latency on ARM64.
+	 */
+	err = fsverity_init_wq(sb, WQ_HIGHPRI, num_online_cpus());
+	if (err) {
+		btrfs_err(fs_info, "fsverity_init_wq failed");
+		return err;
+	}
 #endif
 	sb->s_xattr = btrfs_xattr_handlers;
 	sb->s_time_gran = 1;





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