irele() becomes iunlock(); new irele() does iput() for already unlocked inodes

[unix-history] / usr / src / sys / kern / kern_resource.c

/*      kern_resource.c 4.7     82/06/07        */

#include "../h/param.h"
#include "../h/systm.h"
#include "../h/acct.h"
#include "../h/dir.h"
#include "../h/user.h"
#include "../h/inode.h"
#include "../h/proc.h"
#include "../h/seg.h"

struct  inode *acctp;

/*
* Perform process accounting functions.
*/
sysacct()
{
       register struct inode *ip;
       register struct a {
               char    *fname;
       } *uap;

       uap = (struct a *)u.u_ap;
       if (suser()) {
               if (uap->fname==NULL) {
                       if (ip = acctp) {
                               ilock(ip);
                               iput(ip);
                               acctp = NULL;
                       }
                       return;
               }
               if (acctp) {
                       u.u_error = EBUSY;
                       return;
               }
               ip = namei(uchar, 0, 1);
               if(ip == NULL)
                       return;
               if((ip->i_mode & IFMT) != IFREG) {
                       u.u_error = EACCES;
                       iput(ip);
                       return;
               }
               acctp = ip;
               iunlock(ip);
       }
}

struct  acct acctbuf;
/*
* On exit, write a record on the accounting file.
*/
acct()
{
       register i;
       register struct inode *ip;
       off_t siz;
       register struct acct *ap = &acctbuf;

       if ((ip=acctp)==NULL)
               return;
       ilock(ip);
       for (i=0; i<sizeof(ap->ac_comm); i++)
               ap->ac_comm[i] = u.u_comm[i];
       ap->ac_utime = compress((long)u.u_vm.vm_utime);
       ap->ac_stime = compress((long)u.u_vm.vm_stime);
       ap->ac_etime = compress((long)(time - u.u_start));
       ap->ac_btime = u.u_start;
       ap->ac_uid = u.u_ruid;
       ap->ac_gid = u.u_rgid;
       ap->ac_mem = 0;
       if (i = u.u_vm.vm_utime + u.u_vm.vm_stime)
               ap->ac_mem = (u.u_vm.vm_ixrss + u.u_vm.vm_idsrss) / i;
       ap->ac_io = compress((long)(u.u_vm.vm_inblk + u.u_vm.vm_oublk));
       ap->ac_tty = u.u_ttyd;
       ap->ac_flag = u.u_acflag;
       siz = ip->i_size;
       u.u_offset = siz;
       u.u_base = (caddr_t)ap;
       u.u_count = sizeof(acctbuf);
       u.u_segflg = 1;
       u.u_error = 0;
       writei(ip);
       if(u.u_error)
               ip->i_size = siz;
       iunlock(ip);
}

/*
* Produce a pseudo-floating point representation
* with 3 bits base-8 exponent, 13 bits fraction.
*/
compress(t)
register long t;
{
       register exp = 0, round = 0;

       while (t >= 8192) {
               exp++;
               round = t&04;
               t >>= 3;
       }
       if (round) {
               t++;
               if (t >= 8192) {
                       t >>= 3;
                       exp++;
               }
       }
       return((exp<<13) + t);
}