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Xin LI 82aebf697c Add two new fcntls to enable/disable read-ahead:
- F_READAHEAD: specify the amount for sequential access.  The amount is
   specified in bytes and is rounded up to nearest block size.
 - F_RDAHEAD: Darwin compatible version that use 128KB as the sequential
   access size.

A third argument of zero disables the read-ahead behavior.

Please note that the read-ahead amount is also constrainted by sysctl
variable, vfs.read_max, which may need to be raised in order to better
utilize this feature.

Thanks Igor Sysoev for proposing the feature and submitting the original
version, and kib@ for his valuable comments.

Submitted by:	Igor Sysoev <is rambler-co ru>
Reviewed by:	kib@
MFC after:	1 month
2009-09-28 16:59:47 +00:00
bin
cddl
contrib
crypto
etc Silence warning printed by getfsspec(3) when /etc/fstab does not exist 2009-09-28 03:32:35 +00:00
games
gnu
include
kerberos5
lib Add two new fcntls to enable/disable read-ahead: 2009-09-28 16:59:47 +00:00
libexec printerr_reply() has never been used for as long as we've had this code in 2009-09-26 23:05:01 +00:00
release
rescue
sbin Static'ify internal methods and use prototype. 2009-09-28 07:42:52 +00:00
secure
share Fixed a markup bug. 2009-09-28 09:49:48 +00:00
sys Add two new fcntls to enable/disable read-ahead: 2009-09-28 16:59:47 +00:00
tools Add a simple C program to check mmap calls to various different addresses. 2009-09-27 21:03:33 +00:00
usr.bin
usr.sbin Copy apm(4) emulation from sys/i386/acpica/acpi_machdep.c and 2009-09-27 14:00:16 +00:00
COPYRIGHT
LOCKS
MAINTAINERS
Makefile
Makefile.inc1
ObsoleteFiles.inc
README
UPDATING Fix several logic bugs in the previous IPv6 variable change and 2009-09-26 18:59:00 +00:00

This is the top level of the FreeBSD source directory.  This file
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For copyright information, please see the file COPYRIGHT in this
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for more information, including setting make(1) variables.

The ``buildkernel'' and ``installkernel'' targets build and install
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   http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/kernelconfig.html
And in the config(8) man page.
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The sample kernel configuration files reside in the sys/<arch>/conf
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---------------
bin		System/user commands.

contrib		Packages contributed by 3rd parties.

crypto		Cryptography stuff (see crypto/README).

etc		Template files for /etc.

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gnu		Various commands and libraries under the GNU Public License.
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include		System include files.

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usr.sbin	System administration commands.


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