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Fix the previous simple_lock fix breakage in the combined 

vput/vrele routine.  Fix a panic message.  Fix the vop_nounlock
routine so that "special" filesystems that use it work correctly.
This commit is contained in:
John Dyson 1997-02-27 05:28:58 +00:00
parent 7adec20804
commit fd7f690f94
2 changed files with 42 additions and 26 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

34
sys/kern/vfs_export.c
View File

@ -36,7 +36,7 @@
* SUCH DAMAGE.
*
* @(#)vfs_subr.c 8.31 (Berkeley) 5/26/95
* $Id: vfs_subr.c,v 1.72 1997/02/26 15:35:42 bde Exp $
* $Id: vfs_subr.c,v 1.73 1997/02/27 02:57:03 dyson Exp $
*/
/*
@ -651,7 +651,7 @@ pbrelvp(bp)
#if defined(DIAGNOSTIC)
if (bp->b_vp == (struct vnode *) 0)
panic("brelvp: NULL");
panic("pbrelvp: NULL");
#endif
bp->b_vp = (struct vnode *) 0;
@ -938,7 +938,7 @@ vop_nolock(ap)
}
/*
* Decrement the active use count.
* Do the inverse of vop_nolock, handling the interlock in a compatible way.
*/
int
vop_nounlock(ap)
@ -950,9 +950,13 @@ vop_nounlock(ap)
{
struct vnode *vp = ap->a_vp;
if (vp->v_vnlock == NULL)
if (vp->v_vnlock == NULL) {
if (ap->a_flags & LK_INTERLOCK)
simple_unlock(&ap->a_vp->v_interlock);
return (0);
return (lockmgr(vp->v_vnlock, LK_RELEASE, NULL, ap->a_p));
}
return (lockmgr(vp->v_vnlock, LK_RELEASE | ap->a_flags,
&ap->a_vp->v_interlock, ap->a_p));
}
/*
@ -1024,18 +1028,20 @@ vputrele(vp, put)
vp->v_object &&
(vp->v_object->flags & OBJ_VFS_REF)) {
vp->v_object->flags &= ~OBJ_VFS_REF;
simple_unlock(&vp->v_interlock);
if (put) {
VOP_UNLOCK(vp, 0, p);
VOP_UNLOCK(vp, LK_INTERLOCK, p);
} else {
simple_unlock(&vp->v_interlock);
}
vm_object_deallocate(vp->v_object);
return;
}
if (vp->v_usecount > 0) {
simple_unlock(&vp->v_interlock);
if (put) {
VOP_UNLOCK(vp, 0, p);
VOP_UNLOCK(vp, LK_INTERLOCK, p);
} else {
simple_unlock(&vp->v_interlock);
}
return;
}
@ -1056,18 +1062,20 @@ vputrele(vp, put)
if(vp->v_tag != VT_TFS)
TAILQ_INSERT_TAIL(&vnode_free_list, vp, v_freelist);
}
simple_unlock(&vnode_free_list_slock);
simple_unlock(&vp->v_interlock);
freevnodes++;
simple_unlock(&vnode_free_list_slock);
/*
* If we are doing a vput, the node is already locked, and we must
* call VOP_INACTIVE with the node locked. So, in the case of
* vrele, we explicitly lock the vnode before calling VOP_INACTIVE.
*/
if (put || (vn_lock(vp, LK_EXCLUSIVE | LK_INTERLOCK, p) == 0))
if (put) {
simple_unlock(&vp->v_interlock);
VOP_INACTIVE(vp, p);
} else if (vn_lock(vp, LK_EXCLUSIVE | LK_INTERLOCK, p) == 0) {
VOP_INACTIVE(vp, p);
}
}
/*

34
sys/kern/vfs_subr.c
View File

@ -36,7 +36,7 @@
* SUCH DAMAGE.
*
* @(#)vfs_subr.c 8.31 (Berkeley) 5/26/95
* $Id: vfs_subr.c,v 1.72 1997/02/26 15:35:42 bde Exp $
* $Id: vfs_subr.c,v 1.73 1997/02/27 02:57:03 dyson Exp $
*/
/*
@ -651,7 +651,7 @@ pbrelvp(bp)
#if defined(DIAGNOSTIC)
if (bp->b_vp == (struct vnode *) 0)
panic("brelvp: NULL");
panic("pbrelvp: NULL");
#endif
bp->b_vp = (struct vnode *) 0;
@ -938,7 +938,7 @@ vop_nolock(ap)
}
/*
* Decrement the active use count.
* Do the inverse of vop_nolock, handling the interlock in a compatible way.
*/
int
vop_nounlock(ap)
@ -950,9 +950,13 @@ vop_nounlock(ap)
{
struct vnode *vp = ap->a_vp;
if (vp->v_vnlock == NULL)
if (vp->v_vnlock == NULL) {
if (ap->a_flags & LK_INTERLOCK)
simple_unlock(&ap->a_vp->v_interlock);
return (0);
return (lockmgr(vp->v_vnlock, LK_RELEASE, NULL, ap->a_p));
}
return (lockmgr(vp->v_vnlock, LK_RELEASE | ap->a_flags,
&ap->a_vp->v_interlock, ap->a_p));
}
/*
@ -1024,18 +1028,20 @@ vputrele(vp, put)
vp->v_object &&
(vp->v_object->flags & OBJ_VFS_REF)) {
vp->v_object->flags &= ~OBJ_VFS_REF;
simple_unlock(&vp->v_interlock);
if (put) {
VOP_UNLOCK(vp, 0, p);
VOP_UNLOCK(vp, LK_INTERLOCK, p);
} else {
simple_unlock(&vp->v_interlock);
}
vm_object_deallocate(vp->v_object);
return;
}
if (vp->v_usecount > 0) {
simple_unlock(&vp->v_interlock);
if (put) {
VOP_UNLOCK(vp, 0, p);
VOP_UNLOCK(vp, LK_INTERLOCK, p);
} else {
simple_unlock(&vp->v_interlock);
}
return;
}
@ -1056,18 +1062,20 @@ vputrele(vp, put)
if(vp->v_tag != VT_TFS)
TAILQ_INSERT_TAIL(&vnode_free_list, vp, v_freelist);
}
simple_unlock(&vnode_free_list_slock);
simple_unlock(&vp->v_interlock);
freevnodes++;
simple_unlock(&vnode_free_list_slock);
/*
* If we are doing a vput, the node is already locked, and we must
* call VOP_INACTIVE with the node locked. So, in the case of
* vrele, we explicitly lock the vnode before calling VOP_INACTIVE.
*/
if (put || (vn_lock(vp, LK_EXCLUSIVE | LK_INTERLOCK, p) == 0))
if (put) {
simple_unlock(&vp->v_interlock);
VOP_INACTIVE(vp, p);
} else if (vn_lock(vp, LK_EXCLUSIVE | LK_INTERLOCK, p) == 0) {
VOP_INACTIVE(vp, p);
}
}
/*