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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 09c8fec..940ca27 100644 (file)
--- a/usr/src/sys/kern/subr_xxx.c
+++ b/usr/src/sys/kern/subr_xxx.c
@@ -1,287 +1,97 @@
-/*     subr_xxx.c      4.10    82/04/19        */
-
-/* merged into kernel: @(#)subr.c 2.2 4/8/82 */
+/*
+ * 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%
+ */

 
 

-#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"
-#include "../h/fs.h"
+/*
+ * Miscellaneous trivial functions, including many
+ * that are often inline-expanded or done in assembler.
+ */
+#include "param.h"
+#include "systm.h"
+#include "machine/cpu.h"

 
 /*
 
 /*

- * 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.
+ * Unsupported device function (e.g. writing to read-only device).

  */
  */

-/*VARARGS3*/
-daddr_t
-bmap(ip, bn, rwflg, size)
-       register struct inode *ip;
-       daddr_t bn;
-       int rwflg;
-       int size;       /* supplied only when rwflg == B_WRITE */
+enodev()

 {
 {

-       register int i;
-       int osize, nsize;
-       struct buf *bp, *nbp;
-       struct fs *fs;
-       int j, sh;
-       daddr_t nb, *bap, pref, blkpref();
-
-       if (bn < 0) {
-               u.u_error = EFBIG;
-               return ((daddr_t)0);
-       }
-       fs = ip->i_fs;
-       rablock = 0;
-
-       /*
-        * If the next write will extend the file into a new block,
-        * and the file is currently composed of a fragment
-        * this fragment has to be extended to be a full block.
-        */
-       nb = lblkno(fs, ip->i_size);
-       if (rwflg == B_WRITE && nb < NDADDR && nb < bn) {
-               osize = blksize(fs, ip, nb);
-               if (osize < fs->fs_bsize && osize > 0) {
-                       bp = realloccg(ip, ip->i_db[nb],
-                               nb == 0 ? 0 : ip->i_db[nb - 1] + fs->fs_frag,
-                               osize, fs->fs_bsize);
-                       ip->i_size = (nb + 1) * fs->fs_bsize;
-                       ip->i_db[nb] = dbtofsb(fs, bp->b_blkno);
-                       ip->i_flag |= IUPD|ICHG;
-                       bdwrite(bp);
-               }
-       }
-       /*
-        * The first NDADDR blocks are direct blocks
-        */
-       if (bn < NDADDR) {
-               i = bn;
-               nb = ip->i_db[i];
-               if (rwflg == B_READ) {
-                       if (nb == 0)
-                               return ((daddr_t)-1);
-                       goto gotit;
-               }
-               if (nb == 0 || ip->i_size < (i + 1) * fs->fs_bsize) {
-                       if (nb != 0) {
-                               /* consider need to reallocate a frag */
-                               osize = fragroundup(fs, blkoff(fs, ip->i_size));
-                               nsize = fragroundup(fs, size);
-                               if (nsize <= osize)
-                                       goto gotit;
-                               bp = realloccg(ip, nb, i == 0 ?
-                                       0 : ip->i_db[i - 1] + fs->fs_frag,
-                                       osize, nsize);
-                       } else {
-                               if (ip->i_size < (i + 1) * fs->fs_bsize)
-                                       nsize = fragroundup(fs, size);
-                               else
-                                       nsize = fs->fs_bsize;
-                               bp = alloc(ip, i > 0 ?
-                                       ip->i_db[i - 1] + fs->fs_frag : 0,
-                                       nsize);
-                       }
-                       if (bp == NULL)
-                               return ((daddr_t)-1);
-                       nb = dbtofsb(fs, 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_db[i] = nb;
-                       ip->i_flag |= IUPD|ICHG;
-               }
-gotit:
-               if (i < NDADDR - 1)
-                       rablock = ip->i_db[i+1];
-               return (nb);
-       }
-
-       /*
-        * Determine how many levels of indirection.
-        */
-       sh = 1;
-       bn -= NDADDR;
-       for (j = NIADDR; j>0; j--) {
-               sh *= NINDIR(fs);
-               if (bn < sh)
-                       break;
-               bn -= sh;
-       }
-       if (j == 0) {
-               u.u_error = EFBIG;
-               return ((daddr_t)0);
-       }

 
 

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

 
 

-       /*
-        * fetch through the indirect blocks
-        */
-       for (; j <= NIADDR; j++) {
-               bp = bread(ip->i_dev, fsbtodb(fs, nb), fs->fs_bsize);
-               if (bp->b_flags & B_ERROR) {
-                       brelse(bp);
-                       return ((daddr_t)0);
-               }
-               bap = bp->b_un.b_daddr;
-               sh /= NINDIR(fs);
-               i = (bn / sh) % NINDIR(fs);
-               nb = bap[i];
-               if (nb == 0) {
-                       if (rwflg==B_READ) {
-                               brelse(bp);
-                               return ((daddr_t)-1);
-                       }
-                       if (i % (fs->fs_fsize / sizeof(daddr_t)) == 0 ||
-                           bap[i - 1] == 0)
-                               pref = blkpref(ip->i_fs);
-                       else
-                               pref = bap[i - 1] + fs->fs_frag;
-                       nbp = alloc(ip, pref, fs->fs_bsize);
-                       if (nbp == NULL) {
-                               brelse(bp);
-                               return ((daddr_t)-1);
-                       }
-                       nb = dbtofsb(fs, nbp->b_blkno);
-                       if (j < NIADDR || (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(fs) - 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);

 }
 
 }
 

-#include "ct.h"
-#if NCT > 0

 /*
 /*

- * 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()
+enosys()

 {
 {

-       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);
+
+       return (ENOSYS);

 }
 }

-#endif

 
 /*
 
 /*

- * 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);
 }
 

-unsigned
+unsigned int

 min(a, b)
        unsigned int a, b;
 {
 min(a, b)
        unsigned int a, b;
 {


@@ -289,7 +99,7 @@ min(a, b)
        return (a < b ? a : b);
 }
 
        return (a < b ? a : b);
 }
 

-unsigned
+unsigned int

 max(a, b)
        unsigned int a, b;
 {
 max(a, b)
        unsigned int a, b;
 {


@@ -297,14 +107,77 @@ max(a, b)
        return (a > b ? a : b);
 }
 
        return (a > b ? a : b);
 }
 

-struct proc *
-pfind(pid)
-       int pid;
+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 */