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vfs_getnewfsid.9freebsd

BSD mandoc

NAME

vfs_getnewfsid - allocate a new file system identifier

SYNOPSIS

In sys/param.h In sys/mount.h Ft void Fn vfs_getnewfsid struct mount *mp

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 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);
         ...
 }
 

SEE ALSO

vfs_getvfs9

AUTHORS

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