VFS_GETNEWFSID(9) BSD Kernel Developer's Manual VFS_GETNEWFSID(9)NAMEvfs_getnewfsid — allocate a new file system identifier
SYNOPSIS
#include <sys/param.h>
#include <sys/mount.h>
void
vfs_getnewfsid(struct mount *mp);
DESCRIPTION
The vfs_getnewfsid() function allocates a new file system identifier for
the mount point given. File systems typically call 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 vfs_getvfs(9).
The actual fsid is made up of two 32 bit integers, that are stored in the
statfs structure of mp. The first integer is unique in the set of
mounted file systems, while the second holds the file system type.
typedef struct fsid {
int32_t val[2];
} fsid_t;
PSEUDOCODE
xxx_mount(struct mount *mp, char *path, caddr_t data,
struct nameidata *ndp, struct thread *td)
{
...
vfs_getnewfsid(mp);
...
}
SEE ALSOvfs_getvfs(9)AUTHORS
This manual page was written by Chad David ⟨davidc@acns.ab.ca⟩.
BSD November 21, 2001 BSD
