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

diff --git a/usr/src/sys/kern/subr_xxx.c b/usr/src/sys/kern/subr_xxx.c
index 31d8cae..940ca27 100644 (file)
--- a/usr/src/sys/kern/subr_xxx.c
+++ b/usr/src/sys/kern/subr_xxx.c
@@ -1,238 +1,183 @@
-/*     subr_xxx.c      4.4     %G%     */
-
-#include "../h/param.h"
-#include "../h/systm.h"
-#include "../h/conf.h"
-#include "../h/inode.h"
-#include "../h/dir.h"
-#include "../h/user.h"
-#include "../h/buf.h"
-#include "../h/proc.h"
+/*
+ * Copyright (c) 1982, 1986, 1991 Regents of the University of California.
+ * All rights reserved.
+ *
+ * %sccs.include.redist.c%
+ *
+ *     @(#)subr_xxx.c  7.10 (Berkeley) %G%
+ */

 
 /*
 
 /*

- * Bmap defines the structure of file system storage
- * by returning the physical block number on a device given the
- * inode and the logical block number in a file.
- * When convenient, it also leaves the physical
- * block number of the next block of the file in rablock
- * for use in read-ahead.
+ * Miscellaneous trivial functions, including many
+ * that are often inline-expanded or done in assembler.

  */
  */

-daddr_t
-bmap(ip, bn, rwflg)
-register struct inode *ip;
-daddr_t bn;
-{
-       register i;
-       struct buf *bp, *nbp;
-       int j, sh;
-       daddr_t nb, *bap;
-       dev_t dev;
-
-       if(bn < 0) {
-               u.u_error = EFBIG;
-               return((daddr_t)0);
-       }
-       dev = ip->i_dev;
-       rablock = 0;
-
-       /*
-        * blocks 0..NADDR-4 are direct blocks
-        */
-       if(bn < NADDR-3) {
-               i = bn;
-               nb = ip->i_un.i_addr[i];
-               if(nb == 0) {
-                       if(rwflg==B_READ || (bp = alloc(dev))==NULL)
-                               return((daddr_t)-1);
-                       nb = dbtofsb(bp->b_blkno);
-                       if ((ip->i_mode&IFMT) == IFDIR)
-                               /*
-                                * Write directory blocks synchronously
-                                * so they never appear with garbage in
-                                * them on the disk.
-                                */
-                               bwrite(bp);
-                       else
-                               bdwrite(bp);
-                       ip->i_un.i_addr[i] = nb;
-                       ip->i_flag |= IUPD|ICHG;
-               }
-               if(i < NADDR-4)
-                       rablock = ip->i_un.i_addr[i+1];
-               return(nb);
-       }
+#include "param.h"
+#include "systm.h"
+#include "machine/cpu.h"

 
 

-       /*
-        * addresses NADDR-3, NADDR-2, and NADDR-1
-        * have single, double, triple indirect blocks.
-        * the first step is to determine
-        * how many levels of indirection.
-        */
-       sh = 0;
-       nb = 1;
-       bn -= NADDR-3;
-       for(j=3; j>0; j--) {
-               sh += NSHIFT;
-               nb <<= NSHIFT;
-               if(bn < nb)
-                       break;
-               bn -= nb;
-       }
-       if(j == 0) {
-               u.u_error = EFBIG;
-               return((daddr_t)0);
-       }
+/*
+ * Unsupported device function (e.g. writing to read-only device).
+ */
+enodev()
+{

 
 

-       /*
-        * fetch the first indirect block
-        */
-       nb = ip->i_un.i_addr[NADDR-j];
-       if(nb == 0) {
-               if(rwflg==B_READ || (bp = alloc(dev))==NULL)
-                       return((daddr_t)-1);
-               nb = dbtofsb(bp->b_blkno);
-               /*
-                * Write synchronously so that indirect blocks
-                * never point at garbage.
-                */
-               bwrite(bp);
-               ip->i_un.i_addr[NADDR-j] = nb;
-               ip->i_flag |= IUPD|ICHG;
-       }
+       return (ENODEV);
+}

 
 

-       /*
-        * fetch through the indirect blocks
-        */
-       for(; j<=3; j++) {
-               bp = bread(dev, nb);
-               if(bp->b_flags & B_ERROR) {
-                       brelse(bp);
-                       return((daddr_t)0);
-               }
-               bap = bp->b_un.b_daddr;
-               sh -= NSHIFT;
-               i = (bn>>sh) & NMASK;
-               nb = bap[i];
-               if(nb == 0) {
-                       if(rwflg==B_READ || (nbp = alloc(dev))==NULL) {
-                               brelse(bp);
-                               return((daddr_t)-1);
-                       }
-                       nb = dbtofsb(nbp->b_blkno);
-                       if (j < 3 || (ip->i_mode&IFMT) == IFDIR)
-                               /*
-                                * Write synchronously so indirect blocks
-                                * never point at garbage and blocks
-                                * in directories never contain garbage.
-                                */
-                               bwrite(nbp);
-                       else
-                               bdwrite(nbp);
-                       bap[i] = nb;
-                       bdwrite(bp);
-               } else
-                       brelse(bp);
-       }
+/*
+ * Unconfigured device function; driver not configured.
+ */
+enxio()
+{

 
 

-       /*
-        * calculate read-ahead.
-        */
-       if(i < NINDIR-1)
-               rablock = bap[i+1];
-       return(nb);
+       return (ENXIO);

 }
 
 /*
 }
 
 /*

- * Pass back  c  to the user at his location u_base;
- * update u_base, u_count, and u_offset.  Return -1
- * on the last character of the user's read.
- * u_base is in the user address space unless u_segflg is set.
+ * Unsupported ioctl function.

  */
  */

-passc(c)
-register c;
+enoioctl()

 {
 {

-       register id;

 
 

-       if((id = u.u_segflg) == 1)
-               *u.u_base = c;
-       else
-               if(id?suibyte(u.u_base, c):subyte(u.u_base, c) < 0) {
-                       u.u_error = EFAULT;
-                       return(-1);
-               }
-       u.u_count--;
-       u.u_offset++;
-       u.u_base++;
-       return(u.u_count == 0? -1: 0);
+       return (ENOTTY);

 }
 
 }
 

-#ifdef unneeded

 /*
 /*

- * Pick up and return the next character from the user's
- * write call at location u_base;
- * update u_base, u_count, and u_offset.  Return -1
- * when u_count is exhausted.  u_base is in the user's
- * address space unless u_segflg is set.
+ * Unsupported system function.
+ * This is used for an otherwise-reasonable operation
+ * that is not supported by the current system binary.

  */
  */

-cpass()
-{
-       register c, id;
-
-       if(u.u_count == 0)
-               return(-1);
-       if((id = u.u_segflg) == 1)
-               c = *u.u_base;
-       else
-               if((c = id==0?fubyte(u.u_base):fuibyte(u.u_base)) < 0) {
-                       u.u_error = EFAULT;
-                       return(-1);
-               }
-       u.u_count--;
-       u.u_offset++;
-       u.u_base++;
-       return(c&0377);
-}
-#endif
+enosys()
+{
+
+       return (ENOSYS);
+}

 
 /*
 
 /*

- * Routine which sets a user error; placed in
- * illegal entries in the bdevsw and cdevsw tables.
+ * Return error for operation not supported
+ * on a specific object or file type.

  */
  */

-nodev()
+eopnotsupp()

 {
 
 {
 

-       u.u_error = ENODEV;
+       return (EOPNOTSUPP);

 }
 
 /*
 }
 
 /*

- * Null routine; placed in insignificant entries
- * in the bdevsw and cdevsw tables.
+ * Generic null operation, always returns success.

  */
  */

-nulldev()
+nullop()

 {
 
 {
 

+       return (0);

 }
 
 }
 

+/*
+ * Definitions of various trivial functions;
+ * usually expanded inline rather than being defined here.
+ */
+#ifdef NEED_MINMAX

 imin(a, b)
 imin(a, b)

+       int a, b;

 {
 
        return (a < b ? a : b);
 }
 
 imax(a, b)
 {
 
        return (a < b ? a : b);
 }
 
 imax(a, b)

+       int a, b;

 {
 
        return (a > b ? a : b);
 }
 
 {
 
        return (a > b ? a : b);
 }
 

-struct proc *
-pfind(pid)
-       int pid;
+unsigned int
+min(a, b)
+       unsigned int a, b;
+{
+
+       return (a < b ? a : b);
+}
+
+unsigned int
+max(a, b)
+       unsigned int a, b;
+{
+
+       return (a > b ? a : b);
+}
+
+long
+lmin(a, b)
+       long a, b;
+{
+
+       return (a < b ? a : b);
+}
+
+long
+lmax(a, b)
+       long a, b;
+{
+
+       return (a > b ? a : b);
+}
+
+unsigned long
+ulmin(a, b)
+       unsigned long a, b;
+{
+
+       return (a < b ? a : b);
+}
+
+unsigned long
+ulmax(a, b)
+       unsigned long a, b;
+{
+
+       return (a > b ? a : b);
+}
+#endif /* NEED_MINMAX */
+
+#ifdef NEED_FFS
+ffs(mask)
+       register long mask;
+{
+       register int bit;
+
+       if (!mask)
+               return(0);
+       for (bit = 1;; ++bit) {
+               if (mask&0x01)
+                       return(bit);
+               mask >>= 1;
+       }
+}
+#endif /* NEED_FFS */
+
+#ifdef NEED_BCMP
+bcmp(v1, v2, len)
+       void *v1, *v2;
+       register unsigned len;
+{
+       register u_char *s1 = v1, *s2 = v2;
+
+       while (len--)
+               if (*s1++ != *s2++)
+                       return (1);
+       return (0);
+}
+#endif /* NEED_BCMP */
+
+#ifdef NEED_STRLEN
+strlen(s1)
+       register char *s1;

 {
 {

-       register struct proc *p;
+       register int len;

 
 

-       for (p = &proc[pidhash[PIDHASH(pid)]]; p != &proc[0]; p = &proc[p->p_idhash])
-               if (p->p_pid == pid)
-                       return (p);
-       return ((struct proc *)0);
+       for (len = 0; *s1++ != '\0'; len++)
+               ;
+       return (len);

 }
 }

+#endif /* NEED_STRLEN */