Copyright (C) 2001 Chad David <davidc@acns.ab.ca>. All rights reserved.

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$FreeBSD$

.Dd November 21, 2001 .Dt VFS_GETNEWFSID 9 .Os .Sh NAME .Nm vfs_getnewfsid .Nd "allocate a new file system identifier" .Sh SYNOPSIS n sys/param.h n sys/mount.h .Ft void .Fn vfs_getnewfsid "struct mount *mp" .Sh DESCRIPTION The .Fn vfs_getnewfsid function allocates a new file system identifier for the mount point given. File systems 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 file system via calls such as .Xr vfs_getvfs 9 .

p The actual .Vt fsid is made up of two 32 bit integers, that are stored in the .Vt statfs structure of .Fa mp . The first integer is unique in the set of mounted file systems, while the second holds the file system type. d -literal typedef struct fsid { int32_t val[2]; } fsid_t; .Ed .Sh PSEUDOCODE d -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 manual page was written by .An Chad David Aq davidc@acns.ab.ca .