[15/18] f2fs: use a per-superblock fsverity workqueue

Commit Message

Darrick J. Wong April 30, 2024, 3:23 a.m. UTC

From: Darrick J. Wong <[e-mail]>

Switch f2fs to use a per-sb fsverity workqueue instead of a systemwide
workqueue.

Signed-off-by: Darrick J. Wong <[e-mail]>
---
 fs/f2fs/super.c |   11 +++++++++++
 1 file changed, 11 insertions(+)

Patch

diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index a4bc26dfdb1af..06ac11bb2d214 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -4423,6 +4423,17 @@  static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
 #endif
 #ifdef CONFIG_FS_VERITY
 	sb->s_vop = &f2fs_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)
+		goto free_bio_info;
 #endif
 	sb->s_xattr = f2fs_xattr_handlers;
 	sb->s_export_op = &f2fs_export_ops;