free UFS private data area

[unix-history] / usr / src / sys / ufs / ufs / ufs_inode.c

/*
* Copyright (c) 1991 Regents of the University of California.
* All rights reserved.
*
* %sccs.include.redist.c%
*
*      @(#)ufs_inode.c 7.43 (Berkeley) %G%
*/

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/vnode.h>
#include <sys/mount.h>
#include <sys/kernel.h>
#include <sys/malloc.h>

#include <ufs/ufs/quota.h>
#include <ufs/ufs/inode.h>
#include <ufs/ufs/ufsmount.h>
#include <ufs/ufs/ufs_extern.h>

u_long  nextgennumber;          /* Next generation number to assign. */
int     prtactive = 0;          /* 1 => print out reclaim of active vnodes */

int
ufs_init()
{
       static int first = 1;

       if (!first)
               return (0);
       first = 0;

#ifdef DIAGNOSTIC
       if ((sizeof(struct inode) - 1) & sizeof(struct inode))
               printf("ufs_init: bad size %d\n", sizeof(struct inode));
#endif
       ufs_ihashinit();
       dqinit();
       return (0);
}

/*
* Unlock and decrement the reference count of an inode structure.
*/
void
ufs_iput(ip)
       register struct inode *ip;
{

       if ((ip->i_flag & ILOCKED) == 0)
               panic("iput");
       IUNLOCK(ip);
       vrele(ITOV(ip));
}

/*
* Reclaim an inode so that it can be used for other purposes.
*/
int
ufs_reclaim(vp)
       register struct vnode *vp;
{
       register struct inode *ip;
       int i, type;

       if (prtactive && vp->v_usecount != 0)
               vprint("ufs_reclaim: pushing active", vp);
       /*
        * Remove the inode from its hash chain.
        */
       ip = VTOI(vp);
       remque(ip);
       /*
        * Purge old data structures associated with the inode.
        */
       cache_purge(vp);
       if (ip->i_devvp) {
               vrele(ip->i_devvp);
               ip->i_devvp = 0;
       }
#ifdef QUOTA
       for (i = 0; i < MAXQUOTAS; i++) {
               if (ip->i_dquot[i] != NODQUOT) {
                       dqrele(vp, ip->i_dquot[i]);
                       ip->i_dquot[i] = NODQUOT;
               }
       }
#endif
       switch (vp->v_mount->mnt_stat.f_type) {
       case MOUNT_UFS:
               type = M_FFSNODE;
               break;
       case MOUNT_MFS:
               type = M_MFSNODE;
               break;
       case MOUNT_LFS:
               type = M_LFSNODE;
               break;
       default:
               panic("ufs_reclaim: not ufs file");
       }
       FREE(vp->v_data, type);
       vp->v_data = NULL;
       return (0);
}

/*
* Lock an inode. If its already locked, set the WANT bit and sleep.
*/
void
ufs_ilock(ip)
       register struct inode *ip;
{

       while (ip->i_flag & ILOCKED) {
               ip->i_flag |= IWANT;
               if (ip->i_lockholder == curproc->p_pid)
                       panic("locking against myself");
               ip->i_lockwaiter = curproc->p_pid;
               (void) sleep((caddr_t)ip, PINOD);
       }
       ip->i_lockwaiter = 0;
       ip->i_lockholder = curproc->p_pid;
       ip->i_flag |= ILOCKED;
       curproc->p_spare[2]++;
}

/*
* Unlock an inode.  If WANT bit is on, wakeup.
*/
void
ufs_iunlock(ip)
       register struct inode *ip;
{

       if ((ip->i_flag & ILOCKED) == 0)
               vprint("ufs_iunlock: unlocked inode", ITOV(ip));
       ip->i_lockholder = 0;
       ip->i_flag &= ~ILOCKED;
       curproc->p_spare[2]--;
       if (ip->i_flag&IWANT) {
               ip->i_flag &= ~IWANT;
               wakeup((caddr_t)ip);
       }
}