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vfs_getnewfsid (9)

>> vfs_getnewfsid (9) ( FreeBSD man: Ядро )

BSD mandoc

NAME



vfs_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_getvfs9.

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.

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);
        ...
}

AUTHORS

This manual page was written by An Chad David Aq davidc@acns.ab.ca .

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Created 1996-2024 by Maxim Chirkov
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