VFS_BUSY(9) | FreeBSD Kernel Developer's Manual | VFS_BUSY(9) |
NAME
vfs_busy — marks a mount point as busySYNOPSIS
#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 <davidc@acns.ab.ca>.February 11, 2013 | FreeBSD |