Copyright (C) 2001 Chad David <davidc@acns.ab.ca>. All rights reserved.

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$FreeBSD$

.Dd February 11, 2013 .Dt VFS_BUSY 9 .Os .Sh NAME .Nm vfs_busy .Nd "marks a mount point as busy" .Sh SYNOPSIS n sys/param.h n sys/mount.h .Ft int .Fn vfs_busy "struct mount *mp" "int flags" .Sh DESCRIPTION The .Fn 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 .Fa mp if the .Dv MNTK_UNMOUNT flag is set in .Fa mp->mnt_kern_flag and the .Dv MBF_NOWAIT flag is .Em not set.

p Its arguments are: l -tag -width ".Fa flags" t Fa mp The mount point to busy. t Fa flags Flags controlling how .Fn vfs_busy should act. l -tag -width ".Dv MBF_MNTLSTLOCK" t Dv MBF_NOWAIT do not sleep if .Dv MNTK_UNMOUNT is set. t Dv MBF_MNTLSTLOCK drop the mountlist_mtx in the critical path. .El .El .Sh RETURN VALUES A 0 value is returned on success. If the mount point is being unmounted and MBF_NOWAIT flag is specified .Er ENOENT will be returned. .Sh ERRORS l -tag -width Er t Bq Er ENOENT The mount point is being unmounted .Dv ( MNTK_UNMOUNT is set). .El .Sh SEE ALSO .Xr vfs_unbusy 9 .Sh AUTHORS This manual page was written by .An Chad David Aq davidc@acns.ab.ca .