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100 lines
2.9 KiB
Groff
100 lines
2.9 KiB
Groff
'\" t
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.\" Title: vfs_fileid
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.\" Author: [see the "AUTHOR" section]
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.\" Generator: DocBook XSL Stylesheets v1.76.1 <http://docbook.sf.net/>
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.\" Date: 09/18/2013
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.\" Manual: System Administration tools
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.\" Source: Samba 3.6
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.\" Language: English
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.\"
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.TH "VFS_FILEID" "8" "09/18/2013" "Samba 3\&.6" "System Administration tools"
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.\" -----------------------------------------------------------------
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.\" * Define some portability stuff
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.\" -----------------------------------------------------------------
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.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.\" http://bugs.debian.org/507673
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.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
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.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.ie \n(.g .ds Aq \(aq
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.el .ds Aq '
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.\" -----------------------------------------------------------------
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.\" * set default formatting
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.\" -----------------------------------------------------------------
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.\" disable hyphenation
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.nh
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.\" disable justification (adjust text to left margin only)
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.ad l
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.\" -----------------------------------------------------------------
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.\" * MAIN CONTENT STARTS HERE *
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.\" -----------------------------------------------------------------
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.SH "NAME"
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vfs_fileid \- Generates file_id structs with unique device id values for cluster setups
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.SH "SYNOPSIS"
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.HP \w'\ 'u
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vfs objects = fileid
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.SH "DESCRIPTION"
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.PP
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This VFS module is part of the
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\fBsamba\fR(7)
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suite\&.
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.PP
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Samba uses file_id structs to uniquely identify files for locking purpose\&. By default the file_id contains the device and inode number returned by the
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stat()
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system call\&. As the file_id is a unique identifier of a file, it must be the same on all nodes in a cluster setup\&. This module overloads the
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SMB_VFS_FILE_ID_CREATE()
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operation and generates the device number based on the configured algorithm (see the "fileid:algorithm" option)\&.
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.SH "OPTIONS"
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.PP
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fileid:algorithm = ALGORITHM
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.RS 4
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Available algorithms are
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fsname
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and
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fsid\&. The default value is
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fsname\&.
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.sp
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The
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fsname
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algorithm generates device id by hashing the kernel device name\&.
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.sp
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The
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fsid
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algorithm generates the device id from the
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f_fsid
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returned from the
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statfs()
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syscall\&.
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.RE
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.PP
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fileid:mapping = ALGORITHM
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.RS 4
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This option is the legacy version of the
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fileid:algorithm
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option, which was used in earlier versions of fileid mapping feature in custom Samba 3\&.0 versions\&.
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.RE
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.SH "EXAMPLES"
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.PP
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Usage of the
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fileid
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module with the
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fsid
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algorithm:
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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\fI[global]\fR
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\m[blue]\fBvfs objects = fileid\fR\m[]
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\m[blue]\fBfileid:algorithm = fsid\fR\m[]
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.fi
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.if n \{\
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.RE
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.\}
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.SH "VERSION"
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.PP
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This man page is correct for version 3\&.2 of the Samba suite\&.
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.SH "AUTHOR"
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.PP
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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\&.
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