| vfs_getnewfsid.9 (87252) | vfs_getnewfsid.9 (87857) |
|---|---|
| 1.\" 2.\" Copyright (C) 2001 Chad David <davidc@acns.ab.ca>. All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice(s), this list of conditions and the following disclaimer as --- 10 unchanged lines hidden (view full) --- 19.\" DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 20.\" (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 21.\" SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 22.\" CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH 25.\" DAMAGE. 26.\" | 1.\" 2.\" Copyright (C) 2001 Chad David <davidc@acns.ab.ca>. All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice(s), this list of conditions and the following disclaimer as --- 10 unchanged lines hidden (view full) --- 19.\" DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 20.\" (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 21.\" SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 22.\" CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH 25.\" DAMAGE. 26.\" |
| 27.\" $FreeBSD: head/share/man/man9/vfs_getnewfsid.9 87252 2001-12-03 00:25:04Z alfred $ | 27.\" $FreeBSD: head/share/man/man9/vfs_getnewfsid.9 87857 2001-12-14 09:11:13Z ru $ |
| 28.\" 29.Dd November 21, 2001 30.Dt VFS_GETNEWFSID 9 31.Os 32.Sh NAME 33.Nm vfs_getnewfsid | 28.\" 29.Dd November 21, 2001 30.Dt VFS_GETNEWFSID 9 31.Os 32.Sh NAME 33.Nm vfs_getnewfsid |
| 34.Nd "allocate a new fsid" | 34.Nd "allocate a new filesystem identifier" |
| 35.Sh SYNOPSIS 36.In sys/param.h 37.In sys/mount.h 38.Ft void 39.Fn vfs_getnewfsid "struct mount *mp" 40.Sh DESCRIPTION 41The 42.Fn vfs_getnewfsid 43function allocates a new filesystem identifier for the mount point given. 44Filesystems typically call 45.Fn vfs_getnewfsid | 35.Sh SYNOPSIS 36.In sys/param.h 37.In sys/mount.h 38.Ft void 39.Fn vfs_getnewfsid "struct mount *mp" 40.Sh DESCRIPTION 41The 42.Fn vfs_getnewfsid 43function allocates a new filesystem identifier for the mount point given. 44Filesystems typically call 45.Fn vfs_getnewfsid |
| 46in their mount routine in order to acquire a unique id within the system | 46in their mount routine in order to acquire a unique ID within the system |
| 47which can later be used to uniquely identify the filesystem via calls such as | 47which can later be used to uniquely identify the filesystem via calls such as |
| 48.Fn vfs_getvfs . | 48.Xr vfs_getvfs 9 . |
| 49.Pp | 49.Pp |
| 50The actual fsid is made up of two 32 bit integers, that are stored in the statfs | 50The actual 51.Vt fsid 52is made up of two 32 bit integers, that are stored in the 53.Vt statfs |
| 51structure of 52.Fa mp . | 54structure of 55.Fa mp . |
| 53The first integer is unique in the set of mounted filesystems, while the second holds 54the filesystem type. | 56The first integer is unique in the set of mounted filesystems, 57while the second holds the filesystem type. |
| 55.Bd -literal | 58.Bd -literal |
| 56 typedef struct fsid { 57 int32_t val[2]; 58 } fsid_t; | 59typedef struct fsid { 60 int32_t val[2]; 61} fsid_t; |
| 59.Ed 60.Sh PSEUDOCODE 61.Bd -literal | 62.Ed 63.Sh PSEUDOCODE 64.Bd -literal |
| 62 xxx_mount(struct mount *mp, char *path, caddr_t data, struct nameidata *ndp, struct thread *td) 63 { 64 ... 65 vfs_getnewfsid(mp); 66 ... 67 } | 65xxx_mount(struct mount *mp, char *path, caddr_t data, 66 struct nameidata *ndp, struct thread *td) 67{ 68 ... 69 vfs_getnewfsid(mp); 70 ... 71} |
| 68.Ed 69.Sh SEE ALSO 70.Xr vfs_getvfs 9 71.Sh AUTHORS 72This man page was written by 73.An Chad David Aq davidc@acns.ab.ca . | 72.Ed 73.Sh SEE ALSO 74.Xr vfs_getvfs 9 75.Sh AUTHORS 76This man page was written by 77.An Chad David Aq davidc@acns.ab.ca . |