Adding upstream version 4.22.0.upstream/4.22.0

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 121 insertions, 0 deletions

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+'\" t
+.\"     Title: vfs_readahead
+.\"    Author: [see the "AUTHOR" section]
+.\" Generator: DocBook XSL Stylesheets vsnapshot <http://docbook.sf.net/>
+.\"      Date: 02/20/2024
+.\"    Manual: System Administration tools
+.\"    Source: Samba 4.19.5-git.342.57620c4f7eSUSE-oS16.9-x86_64
+.\"  Language: English
+.\"
+.TH "VFS_READAHEAD" "8" "02/20/2024" "Samba 4\&.19\&.5\-git\&.342\&." "System Administration tools"
+.\" -----------------------------------------------------------------
+.\" * Define some portability stuff
+.\" -----------------------------------------------------------------
+.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+.\" http://bugs.debian.org/507673
+.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
+.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+.ie \n(.g .ds Aq \(aq
+.el       .ds Aq '
+.\" -----------------------------------------------------------------
+.\" * set default formatting
+.\" -----------------------------------------------------------------
+.\" disable hyphenation
+.nh
+.\" disable justification (adjust text to left margin only)
+.ad l
+.\" -----------------------------------------------------------------
+.\" * MAIN CONTENT STARTS HERE *
+.\" -----------------------------------------------------------------
+.SH "NAME"
+vfs_readahead \- pre\-load the kernel buffer cache
+.SH "SYNOPSIS"
+.HP \w'\ 'u
+vfs objects = readahead
+.SH "DESCRIPTION"
+.PP
+This VFS module is part of the
+\fBsamba\fR(7)
+suite\&.
+.PP
+This
+vfs_readahead
+VFS module detects read requests at multiples of a given offset (hex 0x80000 by default) and then tells the kernel via either the readahead system call (on Linux) or the posix_fadvise system call to pre\-fetch this data into the buffer cache\&.
+.PP
+This module is useful for Windows Vista clients reading data using the Windows Explorer program, which asynchronously does multiple file read requests at offset boundaries of 0x80000 bytes\&.
+.PP
+The offset multiple used is given by the readahead:offset option, which defaults to 0x80000\&.
+.PP
+The size of the disk read operations performed by
+vfs_readahead
+is determined by the readahead:length option\&. By default this is set to the same value as the readahead:offset option and if not set explicitly will use the current value of readahead:offset\&.
+.PP
+This module is stackable\&.
+.SH "OPTIONS"
+.PP
+readahead:offset = BYTES
+.RS 4
+The offset multiple that causes readahead to be requested of the kernel buffer cache\&.
+.RE
+.PP
+readahead:length = BYTES
+.RS 4
+The number of bytes requested to be read into the kernel buffer cache on each readahead call\&.
+.RE
+.PP
+The following suffixes may be applied to BYTES:
+.RS
+.sp
+.RS 4
+.ie n \{\
+\h'-04'\(bu\h'+03'\c
+.\}
+.el \{\
+.sp -1
+.IP \(bu 2.3
+.\}
+K
+\- BYTES is a number of kilobytes
+.RE
+.sp
+.RS 4
+.ie n \{\
+\h'-04'\(bu\h'+03'\c
+.\}
+.el \{\
+.sp -1
+.IP \(bu 2.3
+.\}
+M
+\- BYTES is a number of megabytes
+.RE
+.sp
+.RS 4
+.ie n \{\
+\h'-04'\(bu\h'+03'\c
+.\}
+.el \{\
+.sp -1
+.IP \(bu 2.3
+.\}
+G
+\- BYTES is a number of gigabytes
+.RE
+.SH "EXAMPLES"
+.sp
+.if n \{\
+.RS 4
+.\}
+.nf
+	\fI[hypothetical]\fR
+	\m[blue]\fBvfs objects = readahead\fR\m[]
+.fi
+.if n \{\
+.RE
+.\}
+.SH "VERSION"
+.PP
+This man page is part of version 4\&.19\&.5\-git\&.342\&.57620c4f7eSUSE\-oS16\&.9\-x86_64 of the Samba suite\&.
+.SH "AUTHOR"
+.PP
+The original Samba software and related utilities were created by Andrew Tridgell\&. Samba is now developed by the Samba Team as an Open Source project similar to the way the Linux kernel is developed\&.