From 398478b467003af3439f9df80988cf35ce95c2b4 Mon Sep 17 00:00:00 2001 From: alfred Date: Mon, 3 Dec 2001 00:25:04 +0000 Subject: More kernel vfs docco. Xref vfs_mount(9) from vfs_mount(9) Submitted by: Chad David PR: docs/32431 --- share/man/man9/vfs_getnewfsid.9 | 73 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 73 insertions(+) create mode 100644 share/man/man9/vfs_getnewfsid.9 (limited to 'share/man/man9/vfs_getnewfsid.9') diff --git a/share/man/man9/vfs_getnewfsid.9 b/share/man/man9/vfs_getnewfsid.9 new file mode 100644 index 0000000..b12e027 --- /dev/null +++ b/share/man/man9/vfs_getnewfsid.9 @@ -0,0 +1,73 @@ +.\" +.\" Copyright (C) 2001 Chad David . All rights reserved. +.\" +.\" Redistribution and use in source and binary forms, with or without +.\" modification, are permitted provided that the following conditions +.\" are met: +.\" 1. Redistributions of source code must retain the above copyright +.\" notice(s), this list of conditions and the following disclaimer as +.\" the first lines of this file unmodified other than the possible +.\" addition of one or more copyright notices. +.\" 2. Redistributions in binary form must reproduce the above copyright +.\" notice(s), this list of conditions and the following disclaimer in the +.\" documentation and/or other materials provided with the distribution. +.\" +.\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY +.\" EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED +.\" WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE +.\" DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE LIABLE FOR ANY +.\" DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES +.\" (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR +.\" SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER +.\" CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT +.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY +.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH +.\" DAMAGE. +.\" +.\" $FreeBSD$ +.\" +.Dd November 21, 2001 +.Dt VFS_GETNEWFSID 9 +.Os +.Sh NAME +.Nm vfs_getnewfsid +.Nd "allocate a new fsid" +.Sh SYNOPSIS +.In sys/param.h +.In sys/mount.h +.Ft void +.Fn vfs_getnewfsid "struct mount *mp" +.Sh DESCRIPTION +The +.Fn vfs_getnewfsid +function allocates a new filesystem identifier for the mount point given. +Filesystems typically call +.Fn vfs_getnewfsid +in their mount routine in order to acquire a unique id within the system +which can later be used to uniquely identify the filesystem via calls such as +.Fn vfs_getvfs . +.Pp +The actual fsid is made up of two 32 bit integers, that are stored in the statfs +structure of +.Fa mp . +The first integer is unique in the set of mounted filesystems, while the second holds +the filesystem type. +.Bd -literal + typedef struct fsid { + int32_t val[2]; + } fsid_t; +.Ed +.Sh PSEUDOCODE +.Bd -literal + xxx_mount(struct mount *mp, char *path, caddr_t data, struct nameidata *ndp, struct thread *td) + { + ... + vfs_getnewfsid(mp); + ... + } +.Ed +.Sh SEE ALSO +.Xr vfs_getvfs 9 +.Sh AUTHORS +This man page was written by +.An Chad David Aq davidc@acns.ab.ca . -- cgit v1.1