generalize the buffer pool so that NFS can become a client

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

diff --git a/usr/src/sys/kern/kern_descrip.c b/usr/src/sys/kern/kern_descrip.c
index 58da088..769d23d 100644 (file)
--- a/usr/src/sys/kern/kern_descrip.c
+++ b/usr/src/sys/kern/kern_descrip.c
@@ -1,11 +1,27 @@
-/*     kern_descrip.c  6.9     85/03/19        */
+/*
+ * Copyright (c) 1982, 1986, 1989 Regents of the University of California.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms are permitted
+ * provided that the above copyright notice and this paragraph are
+ * duplicated in all such forms and that any documentation,
+ * advertising materials, and other materials related to such
+ * distribution and use acknowledge that the software was developed
+ * by the University of California, Berkeley.  The name of the
+ * University may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ *     @(#)kern_descrip.c      7.4 (Berkeley) %G%
+ */

 
 #include "param.h"
 #include "systm.h"
 
 #include "param.h"
 #include "systm.h"

-#include "dir.h"
-#include "user.h"
+#include "syscontext.h"

 #include "kernel.h"
 #include "kernel.h"

-#include "inode.h"
+#include "vnode.h"

 #include "proc.h"
 #include "file.h"
 #include "socket.h"
 #include "proc.h"
 #include "file.h"
 #include "socket.h"


@@ -19,12 +35,6 @@
  * Descriptor management.
  */
 
  * Descriptor management.
  */
 

-/*
- * TODO:
- *     increase NOFILE
- *     eliminate u.u_error side effects
- */
-

 /*
  * System calls on descriptors.
  */
 /*
  * System calls on descriptors.
  */


@@ -34,16 +44,6 @@ getdtablesize()
        u.u_r.r_val1 = NOFILE;
 }
 
        u.u_r.r_val1 = NOFILE;
 }
 

-getdopt()
-{
-
-}
-
-setdopt()
-{
-
-}
-

 dup()
 {
        register struct a {
 dup()
 {
        register struct a {


@@ -54,10 +54,11 @@ dup()
 
        if (uap->i &~ 077) { uap->i &= 077; dup2(); return; }   /* XXX */
 
 
        if (uap->i &~ 077) { uap->i &= 077; dup2(); return; }   /* XXX */
 

-       GETF(fp, uap->i);
-       j = ufalloc(0);
-       if (j < 0)
+       if ((unsigned)uap->i >= NOFILE || (fp = u.u_ofile[uap->i]) == NULL)
+               RETURN (EBADF);
+       if (u.u_error = ufalloc(0, &j))

                return;
                return;

+       u.u_r.r_val1 = j;

        dupit(j, fp, u.u_pofile[uap->i] &~ UF_EXCLOSE);
 }
 
        dupit(j, fp, u.u_pofile[uap->i] &~ UF_EXCLOSE);
 }
 


@@ -68,7 +69,8 @@ dup2()
        } *uap = (struct a *) u.u_ap;
        register struct file *fp;
 
        } *uap = (struct a *) u.u_ap;
        register struct file *fp;
 

-       GETF(fp, uap->i);
+       if ((unsigned)uap->i >= NOFILE || (fp = u.u_ofile[uap->i]) == NULL)
+               RETURN (EBADF);

        if (uap->j < 0 || uap->j >= NOFILE) {
                u.u_error = EBADF;
                return;
        if (uap->j < 0 || uap->j >= NOFILE) {
                u.u_error = EBADF;
                return;


@@ -95,6 +97,8 @@ dupit(fd, fp, flags)
        u.u_ofile[fd] = fp;
        u.u_pofile[fd] = flags;
        fp->f_count++;
        u.u_ofile[fd] = fp;
        u.u_pofile[fd] = flags;
        fp->f_count++;

+       if (fd > u.u_lastfile)
+               u.u_lastfile = fd;

 }
 
 /*
 }
 
 /*


@@ -107,22 +111,23 @@ fcntl()
                int     fdes;
                int     cmd;
                int     arg;
                int     fdes;
                int     cmd;
                int     arg;

-       } *uap;
-       register i;
+       } *uap = (struct a *)u.u_ap;

        register char *pop;
        register char *pop;

+       int i;

 
 

-       uap = (struct a *)u.u_ap;
-       GETF(fp, uap->fdes);
+       if ((unsigned)uap->fdes >= NOFILE ||
+           (fp = u.u_ofile[uap->fdes]) == NULL)
+               RETURN (EBADF);

        pop = &u.u_pofile[uap->fdes];
        switch(uap->cmd) {
        case F_DUPFD:
        pop = &u.u_pofile[uap->fdes];
        switch(uap->cmd) {
        case F_DUPFD:

-               i = uap->arg;
-               if (i < 0 || i >= NOFILE) {
+               if (uap->arg < 0 || uap->arg >= NOFILE) {

                        u.u_error = EINVAL;
                        return;
                }
                        u.u_error = EINVAL;
                        return;
                }

-               if ((i = ufalloc(i)) < 0)
+               if (u.u_error = ufalloc(uap->arg, &i))

                        return;
                        return;

+               u.u_r.r_val1 = i;

                dupit(i, fp, *pop &~ UF_EXCLOSE);
                break;
 
                dupit(i, fp, *pop &~ UF_EXCLOSE);
                break;
 


@@ -184,7 +189,7 @@ fgetown(fp, valuep)
        switch (fp->f_type) {
 
        case DTYPE_SOCKET:
        switch (fp->f_type) {
 
        case DTYPE_SOCKET:

-               *valuep = ((struct socket *)fp->f_data)->so_pgrp;
+               *valuep = ((struct socket *)fp->f_data)->so_pgid;

                return (0);
 
        default:
                return (0);
 
        default:


@@ -200,14 +205,14 @@ fsetown(fp, value)
 {
 
        if (fp->f_type == DTYPE_SOCKET) {
 {
 
        if (fp->f_type == DTYPE_SOCKET) {

-               ((struct socket *)fp->f_data)->so_pgrp = value;
+               ((struct socket *)fp->f_data)->so_pgid = value;

                return (0);
        }
        if (value > 0) {
                struct proc *p = pfind(value);
                if (p == 0)
                return (0);
        }
        if (value > 0) {
                struct proc *p = pfind(value);
                if (p == 0)

-                       return (EINVAL);
-               value = p->p_pgrp;
+                       return (ESRCH);
+               value = p->p_pgrp->pg_id;

        } else
                value = -value;
        return (fioctl(fp, (int)TIOCSPGRP, (caddr_t)&value));
        } else
                value = -value;
        return (fioctl(fp, (int)TIOCSPGRP, (caddr_t)&value));


@@ -224,17 +229,21 @@ fioctl(fp, cmd, value)
 
 close()
 {
 
 close()
 {

-       register struct a {
-               int     i;
+       struct a {
+               int     fdes;

        } *uap = (struct a *)u.u_ap;
        register struct file *fp;
        register u_char *pf;
 
        } *uap = (struct a *)u.u_ap;
        register struct file *fp;
        register u_char *pf;
 

-       GETF(fp, uap->i);
-       pf = (u_char *)&u.u_pofile[uap->i];
+       if ((unsigned)uap->fdes >= NOFILE ||
+           (fp = u.u_ofile[uap->fdes]) == NULL)
+               RETURN (EBADF);
+       pf = (u_char *)&u.u_pofile[uap->fdes];

        if (*pf & UF_MAPPED)
        if (*pf & UF_MAPPED)

-               munmapfd(uap->i);
-       u.u_ofile[uap->i] = NULL;
+               munmapfd(uap->fdes);
+       u.u_ofile[uap->fdes] = NULL;
+       while (u.u_lastfile >= 0 && u.u_ofile[u.u_lastfile] == NULL)
+               u.u_lastfile--;

        *pf = 0;
        closef(fp);
        /* WHAT IF u.u_error ? */
        *pf = 0;
        closef(fp);
        /* WHAT IF u.u_error ? */


@@ -246,15 +255,16 @@ fstat()
        register struct a {
                int     fdes;
                struct  stat *sb;
        register struct a {
                int     fdes;
                struct  stat *sb;

-       } *uap;
+       } *uap = (struct a *)u.u_ap;

        struct stat ub;
 
        struct stat ub;
 

-       uap = (struct a *)u.u_ap;
-       GETF(fp, uap->fdes);
+       if ((unsigned)uap->fdes >= NOFILE ||
+           (fp = u.u_ofile[uap->fdes]) == NULL)
+               RETURN (EBADF);

        switch (fp->f_type) {
 
        switch (fp->f_type) {
 

-       case DTYPE_INODE:
-               u.u_error = ino_stat((struct inode *)fp->f_data, &ub);
+       case DTYPE_VNODE:
+               u.u_error = vn_stat((struct vnode *)fp->f_data, &ub);

                break;
 
        case DTYPE_SOCKET:
                break;
 
        case DTYPE_SOCKET:


@@ -273,18 +283,21 @@ fstat()
 /*
  * Allocate a user file descriptor.
  */
 /*
  * Allocate a user file descriptor.
  */

-ufalloc(i)
-       register int i;
+ufalloc(want, result)
+       register int want;
+       int *result;

 {
 
 {
 

-       for (; i < NOFILE; i++)
-               if (u.u_ofile[i] == NULL) {
-                       u.u_r.r_val1 = i;
-                       u.u_pofile[i] = 0;
-                       return (i);
+       for (; want < NOFILE; want++)
+               if (u.u_ofile[want] == NULL) {
+                       u.u_pofile[want] = 0;
+                       if (want > u.u_lastfile)
+                               u.u_lastfile = want;
+                       if (result)
+                               *result = want;
+                       return (0);

                }
                }

-       u.u_error = EMFILE;
-       return (-1);
+       return (EMFILE);

 }
 
 ufavail()
 }
 
 ufavail()


@@ -304,15 +317,15 @@ struct    file *lastf;
  * Initialize the descriptor
  * to point at the file structure.
  */
  * Initialize the descriptor
  * to point at the file structure.
  */

-struct file *
-falloc()
+falloc(resultfp, resultfd)
+       struct file **resultfp;
+       int *resultfd;

 {
        register struct file *fp;
 {
        register struct file *fp;

-       register i;
+       int error, i;

 
 

-       i = ufalloc(0);
-       if (i < 0)
-               return (NULL);
+       if (error = ufalloc(0, &i))
+               return (error);

        if (lastf == 0)
                lastf = file;
        for (fp = lastf; fp < fileNFILE; fp++)
        if (lastf == 0)
                lastf = file;
        for (fp = lastf; fp < fileNFILE; fp++)


@@ -322,43 +335,25 @@ falloc()
                if (fp->f_count == 0)
                        goto slot;
        tablefull("file");
                if (fp->f_count == 0)
                        goto slot;
        tablefull("file");

-       u.u_error = ENFILE;
-       return (NULL);
+       return (ENFILE);

 slot:
        u.u_ofile[i] = fp;
        fp->f_count = 1;
        fp->f_data = 0;
        fp->f_offset = 0;
 slot:
        u.u_ofile[i] = fp;
        fp->f_count = 1;
        fp->f_data = 0;
        fp->f_offset = 0;

+       fp->f_cred = u.u_cred;
+       crhold(fp->f_cred);

        lastf = fp + 1;
        lastf = fp + 1;

-       return (fp);
-}
-
-/*
- * Convert a user supplied file descriptor into a pointer
- * to a file structure.  Only task is to check range of the descriptor.
- * Critical paths should use the GETF macro.
- */
-struct file *
-getf(f)
-       register int f;
-{
-       register struct file *fp;
-
-       if ((unsigned)f >= NOFILE || (fp = u.u_ofile[f]) == NULL) {
-               u.u_error = EBADF;
-               return (NULL);
-       }
-       return (fp);
+       if (resultfp)
+               *resultfp = fp;
+       if (resultfd)
+               *resultfd = i;
+       return (0);

 }
 
 /*
  * Internal form of close.
  * Decrement reference count on file structure.
 }
 
 /*
  * Internal form of close.
  * Decrement reference count on file structure.

- * If last reference not going away, but no more
- * references except in message queues, run a
- * garbage collect.  This would better be done by
- * forcing a gc() to happen sometime soon, rather
- * than running one each time.

  */
 closef(fp)
        register struct file *fp;
  */
 closef(fp)
        register struct file *fp;


@@ -368,11 +363,12 @@ closef(fp)
                return;
        if (fp->f_count > 1) {
                fp->f_count--;
                return;
        if (fp->f_count > 1) {
                fp->f_count--;

-               if (fp->f_count == fp->f_msgcount)
-                       unp_gc();

                return;
        }
                return;
        }

+       if (fp->f_count < 1)
+               panic("closef: count < 1");

        (*fp->f_ops->fo_close)(fp);
        (*fp->f_ops->fo_close)(fp);

+       crfree(fp->f_cred);

        fp->f_count = 0;
 }
 
        fp->f_count = 0;
 }
 


@@ -382,18 +378,20 @@ closef(fp)
 flock()
 {
        register struct a {
 flock()
 {
        register struct a {

-               int     fd;
+               int     fdes;

                int     how;
        } *uap = (struct a *)u.u_ap;
        register struct file *fp;
 
                int     how;
        } *uap = (struct a *)u.u_ap;
        register struct file *fp;
 

-       GETF(fp, uap->fd);
-       if (fp->f_type != DTYPE_INODE) {
+       if ((unsigned)uap->fdes >= NOFILE ||
+           (fp = u.u_ofile[uap->fdes]) == NULL)
+               RETURN (EBADF);
+       if (fp->f_type != DTYPE_VNODE) {

                u.u_error = EOPNOTSUPP;
                return;
        }
        if (uap->how & LOCK_UN) {
                u.u_error = EOPNOTSUPP;
                return;
        }
        if (uap->how & LOCK_UN) {

-               ino_unlock(fp, FSHLOCK|FEXLOCK);
+               vn_unlock(fp, FSHLOCK|FEXLOCK);

                return;
        }
        if ((uap->how & (LOCK_SH | LOCK_EX)) == 0)
                return;
        }
        if ((uap->how & (LOCK_SH | LOCK_EX)) == 0)


@@ -404,5 +402,70 @@ flock()
        if ((fp->f_flag & FEXLOCK) && (uap->how & LOCK_EX) ||
            (fp->f_flag & FSHLOCK) && (uap->how & LOCK_SH))
                return;
        if ((fp->f_flag & FEXLOCK) && (uap->how & LOCK_EX) ||
            (fp->f_flag & FSHLOCK) && (uap->how & LOCK_SH))
                return;

-       u.u_error = ino_lock(fp, uap->how);
+       u.u_error = vn_lock(fp, uap->how);
+}
+
+/*
+ * File Descriptor pseudo-device driver (/dev/fd/).
+ *
+ * Fred Blonder - U of Maryland        11-Sep-1984
+ *
+ * Opening minor device N dup()s the file (if any) connected to file
+ * descriptor N belonging to the calling process.  Note that this driver
+ * consists of only the ``open()'' routine, because all subsequent
+ * references to this file will be direct to the other driver.
+ */
+/* ARGSUSED */
+fdopen(dev, mode, type)
+       dev_t dev;
+       int mode, type;
+{
+       struct file *fp, *wfp;
+       int indx, dfd, rwmode;
+
+       /*
+        * Note the horrid kludge here: u.u_r.r_val1 contains the value
+        * of the new file descriptor, which was set before the call to
+        * vn_open() by copen() in vfs_syscalls.c
+        */
+       indx = u.u_r.r_val1;            /* XXX */
+       if ((unsigned)indx >= NOFILE || (fp = u.u_ofile[indx]) == NULL)
+               return (EBADF);
+       dfd = minor(dev);
+       if ((unsigned)dfd >= NOFILE || (wfp = u.u_ofile[dfd]) == NULL)
+               return (EBADF);
+       /*
+        * We must explicitly test for this case because ufalloc() may
+        * have allocated us the same file desriptor we are referring
+        * to, if the proccess referred to an invalid (closed) descriptor.
+        * Ordinarily this would be caught by the check for NULL above,
+        * but by the time we reach this routine u_pofile[minor(dev)]
+        * could already be set to point to our file struct.
+        */
+       if (fp == wfp)
+               return (EBADF);
+       /*
+        * Fake a ``dup()'' sys call.
+        * Check that the mode the file is being opened
+        * for is consistent with the mode of the existing
+        * descriptor. This isn't as clean as it should be,
+        * but this entire driver is a real kludge anyway.
+        */
+       rwmode = mode & (FREAD|FWRITE);
+       if ((fp->f_flag & rwmode) != rwmode)
+               return (EACCES);
+       /*
+        * Delete references to this pseudo-device.
+        * Note that fp->f_count is guaranteed == 1, and
+        * that fp references the vnode for this driver.
+        */
+       if (fp->f_count != 1 || fp->f_type != DTYPE_VNODE) 
+               panic("fdopen");
+       vrele((struct vnode *)fp->f_data);
+       fp->f_count = 0;
+       /* 
+        * Dup the file descriptor. 
+        */
+       dupit(indx, wfp, u.u_pofile[dfd]);
+       return (0);

 }
 }