bionic (9) insmntque.9freebsd.gz

NAME

     insmntque, insmntque1 — associate a vnode with a mount

SYNOPSIS

     #include <sys/param.h>
     #include <sys/vnode.h>

     int
     insmntque(struct vnode *vp, struct mount *mp);

     int
     insmntque1(struct vnode *vp, struct mount *mp, void (*dtr)(struct vnode *, void *), void *dtr_arg);

DESCRIPTION

     The insmntque() function associates a vnode with a mount.  This includes updating v_mount for the vnode,
     and inserting the vnode into the mount's vnode list.

     The mount reference count is incremented for each vnode added to the mount, and that reference is
     decremented by vgone(9).

     The mount's interlock is held while the vnode is inserted.  For MP-safe file systems, the vnode must be
     exclusively locked.

     On failure, insmntque() calls vgone(9) on the supplied vnode, and then drops the vnode lock and reference.
     If more elaborated cleanup after insmntque() failure is needed, the insmntque1() function may be used
     instead.  The dtr argument is a pointer to a function that is called on failure.  This function may perform
     any custom cleanup.  The vnode pointer is supplied as the first argument to dtr.  The dtr_arg argument is
     the second, supplying any additional context needed.

RETURN VALUES

     The insmntque() function will always return 0, unless the file system is currently being unmounted in which
     case it may return EBUSY.  Also, insmntque() may be forced to insert the vnode into the mount's vnode list
     by setting the VV_FORCEINSMQ flag in the vnode v_flag, even if the file system is being unmounted.

SEE ALSO

     vgone(9)

AUTHORS

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