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VFS_BUSY(9) FreeBSD 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).
SEE ALSO
vfs_unbusy(9)
AUTHORS
This manual page was written by Chad David <davidc@acns.ab.ca>.
FreeBSD 14.0-RELEASE-p6 February 11, 2013 FreeBSD 14.0-RELEASE-p6