D47356.id145737.diff
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	diff --git a/sys/fs/tarfs/tarfs_vnops.c b/sys/fs/tarfs/tarfs_vnops.c
	--- a/sys/fs/tarfs/tarfs_vnops.c
	+++ b/sys/fs/tarfs/tarfs_vnops.c
	@@ -38,11 +38,19 @@
	#include <sys/mount.h>
	#include <sys/namei.h>
	#include <sys/proc.h>
	+#include <sys/sysctl.h>
	#include <sys/vnode.h>

	#include <fs/tarfs/tarfs.h>
	#include <fs/tarfs/tarfs_dbg.h>

	+static int bmap_readbehind = 1;
	+SYSCTL_INT(_vfs_tarfs, OID_AUTO, bmap_readbehind, CTLFLAG_RWTUN,
	+ &bmap_readbehind, 0, "Enable read-behind for block mapping operations");
	+static int readahead_max = -1;
	+SYSCTL_INT(_vfs_tarfs, OID_AUTO, readahead_max, CTLFLAG_RWTUN,
	+ &readahead_max, 0, "Maximum read-ahead in blocks");
	+
	static int
	tarfs_open(struct vop_open_args *ap)
	{
	@@ -173,9 +181,11 @@
	}

	rmax = vp->v_mount->mnt_iosize_max / iosize - 1;
	+ if (readahead_max >= 0 && rmax > readahead_max)
	+ rmax = readahead_max;
	*ap->a_runp = imin(ra, rmax);
	if (ap->a_runb != NULL)
	- *ap->a_runb = imin(rb, rmax);
	+ *ap->a_runb = bmap_readbehind ? imin(rb, rmax) : 0;
	return (0);
	}