table of contents
VFS_BUSY(9) | 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 theMNTK_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 specifiedENOENT
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⟩.June 14, 2010 | Debian |