jammy (9) vfs_getnewfsid.9freebsd.gz

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_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 ALSO

     vfs_getvfs(9)

AUTHORS

     This manual page was written by Chad David <davidc@acns.ab.ca>.