VOP_REVOKE(9) BSD Kernel Developer's Manual VOP_REVOKE(9)NAME
VOP_REVOKE -- revoke access to a device and its aliases
VOP_REVOKE(struct vnode *vp, int flags);
VOP_REVOKE() will administratively revoke access to the device specified by vp, as well as any aliases created via make_dev_alias(9). Fur-
ther file operations on any of these devices by processes which have them open will nominally fail. The flags must be set to REVOKEALL to
signify that all access will be revoked; any other value is invalid.
The vp must be unlocked on entry, and will remain unlocked upon return.
SEE ALSO make_dev_alias(9), vnode(9)AUTHORS
This manual page was written by Brian Fundakowski Feldman.
BSD February 5, 2002 BSD
Check Out this Related Man Page
VRELE(9) BSD Kernel Developer's Manual VRELE(9)NAME
vput, vrele, vunref -- decrement the use count for a vnode
vput(struct vnode *vp);
vrele(struct vnode *vp);
vunref(struct vnode *vp);
Decrement the v_usecount field of a vnode.
vp the vnode to decrement
The vrele() function takes an unlocked vnode and returns with the vnode unlocked.
The vput() function should be given a locked vnode as argument, the vnode is unlocked after the function returned. The vput() is opera-
tionally equivalent to calling VOP_UNLOCK(9) followed by vrele(9), with less overhead.
The vunref() function takes a locked vnode as argument, and returns with the vnode locked.
Any code in the system which signified its use of a vnode by usecount should call one of the listed function to decrement use counter. If
the v_usecount field of the non-doomed vnode reaches zero, then it will be inactivated and placed on the free list. Since the functions
might need to call VOPs for the vnode, the Giant mutex should be conditionally locked around the call.
The hold count for the vnode is always greater or equal to the usecount. Non-forced unmount fails when mount point owns a vnode that has
non-zero usecount, see vflush(9).
SEE ALSO vget(9), vnode(9), vref(9), vrefcnt(9)AUTHORS
This manual page was written by Doug Rabson and
BSD November 20, 2010 BSD
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