VFS_BUSY (9) | Kernel routines | Unix Manual Pages | :man▋
vfs_busy - "marks a mount point as busy"
.In sys/mount.h int vfs_busy "struct mount *mp" "int flags" "struct mtx *interlkp" "struct thread *td"
The vfs_busy function marks a mount point as busy. The purpose of this function is to synchronize access to 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 LK_NOWAIT flag is not set.
Its arguments are:
| mp || The mount point to busy. |
| flags || Flags controlling how vfs_busy should act. |
| LK_NOWAIT || do not sleep if MNTK_UNMOUNT is set. |
| interlkp || The interlock mutex for mp->mount_lock. If there is any chance the mount point is being unmounted and LK_NOWAIT is not set then interlock must be valid locked mutex. |
| td || The thread responsible for this call. |
If interlkp is a valid pointer it must be locked on entry, and it will not be unlocked even in the case of an error.
A 0 value is returned on success. If the mount point is being unmounted ENOENT will always be returned.
| || The mount point is being unmounted ( MNTK_UNMOUNT is set). |
This manual page was written by
.An Chad David Aq firstname.lastname@example.org .
shtml">manServer 1.07 from vfs_busy.9 using doc macros.
|July 8, 2001 ||VFS_BUSY (9) || |
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