Проект OpenNet: MAN VFS_UNLOCK_GIANT (9) Ядро (FreeBSD и Linux)

Интерактивная система просмотра системных руководств (man-ов)

VFS_UNLOCK_GIANT (9)

>> VFS_UNLOCK_GIANT (9) ( FreeBSD man: Ядро )

BSD mandoc

NAME



VFS_LOCK_GIANT

 
VFS_UNLOCK_GIANT

 - conditionally lock and unlock Giant around entry into VFS

SYNOPSIS

   #include <sys/param.h>
   #include <sys/mount.h>
   #include <sys/vnode.h>
int VFS_LOCK_GIANT (struct mount *mp);
void VFS_UNLOCK_GIANT (int vfslocked);

DESCRIPTION

VFS_LOCK_GIANT ();
will conditionally acquire the Giant lock if the file system referenced by Fa mp is marked as MPSAFE or not, returning a flag indicating whether Giant was set, which may later be passed to VFS_UNLOCK_GIANT (.);
The value of Fa mp will typically be derived from the mount pointer in a Vt vnode on which a VFS operation will be performed.

VFS_UNLOCK_GIANT ();
conditionally releases the Giant lock if the passed Fa vfslocked argument is non-zero. It is expected that the argument will be derived from the return values of VFS_LOCK_GIANT ();
or NDHASGIANT(9).