From 1e12157c61b09924aecf94545a1e94be772e803d Mon Sep 17 00:00:00 2001 From: Alfred Perlstein Date: Mon, 13 Dec 1999 02:28:53 +0000 Subject: explain that ioflags can be used to give read-ahead hints to the underlying filesystem. --- share/man/man9/VOP_RDWR.9 | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) (limited to 'share/man/man9/VOP_RDWR.9') diff --git a/share/man/man9/VOP_RDWR.9 b/share/man/man9/VOP_RDWR.9 index 5e67262da0c7..a1e28fd72d63 100644 --- a/share/man/man9/VOP_RDWR.9 +++ b/share/man/man9/VOP_RDWR.9 @@ -60,7 +60,11 @@ the credentials of the caller .Pp The .Fa ioflag -argument is a bit mask which can contain the following flags: +argument is used to give directives and hints to the filesystem. +When attempting a read, the high 16 bits are used to provide a +read-ahead hint (in units of filesystem blocks) that the filesystem +should attempt. The low 16 bits are a bit mask which can contain +the following flags: .Bl -tag -width IO_NODELOCKED .It Dv IO_UNIT do I/O as atomic unit -- cgit v1.2.3