vfs_busy(9) [debian man page]

VFS_BUSY(9)						   BSD Kernel Developer's Manual					       VFS_BUSY(9)

NAME

     vfs_busy -- marks a mount point as busy

SYNOPSIS

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

     int
     vfs_busy(struct mount *mp, int flags);

DESCRIPTION

     The vfs_busy() function marks a mount point as busy by incrementing the reference count of a mount point.	It also delays unmounting by
     sleeping on mp if the MNTK_UNMOUNT flag is set in mp->mnt_kern_flag and the MBF_NOWAIT flag is not set.

     Its arguments are:

     mp     The mount point to busy.

     flags  Flags controlling how vfs_busy() should act.

	    MBF_NOWAIT	    do not sleep if MNTK_UNMOUNT is set.

	    MBF_MNTLSTLOCK  drop the mountlist_mtx in the critical path.

RETURN VALUES

     A 0 value is returned on success.	If the mount point is being unmounted and MBF_NOWAIT flag is specified ENOENT will be returned.

ERRORS

     [ENOENT]		The mount point is being unmounted (MNTK_UNMOUNT is set).

AUTHORS

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

BSD
								   June 14, 2010							       BSD

INSMNTQUE(9)						   BSD Kernel Developer's Manual					      INSMNTQUE(9)

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>.

BSD
								 September 8, 2008							       BSD