devfs: plug redundant bwillwrite avoidance

vn_write already checks for vnode type to see if bwillwrite should be called.

This effectively reverts r244643.

Reviewed by:	kib
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D21905

1 files changed, 0 insertions, 11 deletions

diff --git a/sys/fs/devfs/devfs_vnops.c b/sys/fs/devfs/devfs_vnops.c
index ab6e7e13b8ba..3b80c68e3091 100644
--- a/sys/fs/devfs/devfs_vnops.c
+++ b/sys/fs/devfs/devfs_vnops.c
@@ -1137,7 +1137,6 @@ devfs_open(struct vop_open_args *ap)
 	int error, ref, vlocked;
 	struct cdevsw *dsw;
 	struct file *fpop;
-	struct mtx *mtxp;
 
 	if (vp->v_type == VBLK)
 		return (ENXIO);
@@ -1191,16 +1190,6 @@ devfs_open(struct vop_open_args *ap)
 #endif
 	if (fp->f_ops == &badfileops)
 		finit(fp, fp->f_flag, DTYPE_VNODE, dev, &devfs_ops_f);
-	mtxp = mtx_pool_find(mtxpool_sleep, fp);
-
-	/*
-	 * Hint to the dofilewrite() to not force the buffer draining
-	 * on the writer to the file.  Most likely, the write would
-	 * not need normal buffers.
-	 */
-	mtx_lock(mtxp);
-	fp->f_vnread_flags |= FDEVFS_VNODE;
-	mtx_unlock(mtxp);
 	return (error);
 }