Michael Phipps
ceb3763e56
areas will not step on each others feet... Added comments all over the place. Bugs squished git-svn-id: file:///srv/svn/repos/haiku/trunk/current@2248 a95241bf-73f2-0310-859d-f6bbb57e9c96
76 lines
2.5 KiB
C++
76 lines
2.5 KiB
C++
#include <vnodeManager.h>
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#include <vnodePool.h>
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// Functions for hash and isEqual
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ulong mnHash (node &vnodule) { return ((vnode &)vnodule).fd; }
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bool mnIsEqual (node &vnodule1,node &vnodule2) {
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vnode &v1= ((vnode &)vnodule1);
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vnode &v2= ((vnode &)vnodule2);
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return v1.fd==v2.fd && v1.offset==v2.offset;
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}
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// Set the hash and isEqual functions
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vnodeManager::vnodeManager(void) : vnodes(20) {
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vnodes.setHash(mnHash);
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vnodes.setIsEqual(mnIsEqual);
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}
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// Find the vnode and return the first page that points to it.
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vpage *vnodeManager::findVnode(vnode &target) {
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vnode *found=reinterpret_cast<vnode *>(vnodes.find(&target));
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if (found==NULL)
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return NULL;
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else
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return reinterpret_cast<vpage *>(found->vpages.top());
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}
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// If this vnode is already in use, add this vpage to it and return one to clone. If not, add this vnode, with this vpage, and return null
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// This method will make a new vnode object
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vpage *vnodeManager::addVnode(vnode &target,vpage &vp) {
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vpage *retVal;
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error ("vnodeManager::addVnode : Adding by reference node %x, fd = %d, offset = %d\n",&target,target.fd,target.offset);
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vnode *found=reinterpret_cast<vnode *>(vnodes.find(&target));
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if (!found) {
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found=new (vmBlock->vnodePool->get()) vnode;
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found->fd=target.fd;
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found->offset=target.offset;
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vnodes.add(found);
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retVal=NULL;
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}
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else
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retVal=reinterpret_cast<vpage *>(found->vpages.top());
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found->vpages.add(&vp);
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return retVal;
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}
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// If this vnode is already in use, add this vpage to it and return one to clone. If not, add this vnode, with this vpage, and return null
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// This method will NOT make a new vnode object
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vpage *vnodeManager::addVnode(vnode *target,vpage &vp) {
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vpage *retVal;
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error ("vnodeManager::addVnode : Adding by pointer node %x, fd = %d, offset = %d\n",target,target->fd,target->offset);
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vnode *found=reinterpret_cast<vnode *>(vnodes.find(target));
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if (!found) {
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found=target;
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vnodes.add(found);
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retVal=NULL;
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}
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else
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retVal=reinterpret_cast<vpage *>(found->vpages.top());
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found->vpages.add(&vp);
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found->vpages.dump();
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vnodes.dump();
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}
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// Remove a vpage from the manager; return "is this the last one"
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bool vnodeManager::remove(vnode &target,vpage &vp) {
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error ("vnodeManager::remove : Removing by reference node %x, fd = %d, offset = %d\n",&target,target.fd,target.offset);
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vnode *found=reinterpret_cast<vnode *>(vnodes.find(&target));
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if (!found) {
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vnodes.dump();
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throw ("An attempt to remove from an unknown vnode occured!\n");
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}
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found->vpages.remove(&vp);
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return (found->vpages.count()==0);
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}
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