insmntque (9)

Leading comments

Copyright (C) 2008 Chad David <davidc@acns.ab.ca>.
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(The comments found at the beginning of the groff file "man9/insmntque.9freebsd".)

NAME

insmntque insmntque1 - associate a vnode with a mount

SYNOPSIS

In sys/param.h In sys/vnode.h Ft int Fn insmntque struct vnode *vp struct mount *mp Ft int Fn insmntque1 struct vnode *vp struct mount *mp void (*dtr)(struct vnode *, void *) void *dtr_arg

DESCRIPTION

The Fn 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, Fn insmntque calls vgone(9) on the supplied vnode, and then drops the vnode lock and reference. If more elaborated cleanup after Fn insmntque failure is needed, the Fn insmntque1 function may be used instead. The Fa 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 Fa dtr . The Fa dtr_arg argument is the second, supplying any additional context needed.

RETURN VALUES

The Fn insmntque function will always return 0, unless the file system is currently being unmounted in which case it may return EBUSY Also, Fn 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 An Chad David Aq davidc@acns.ab.ca .