kern/68961: [PATCH] Implement /dev/full

Robert Millan <rmh@debian.org> · Mon, 12 Jul 2004 23:24:20 +0200

diff -Nur sys/compat/linux.old/linux_full.c sys/compat/linux/linux_full.c

--- sys/compat/linux.old/linux_full.c    1970-01-01 01:00:00.000000000 +0100
+++ sys/compat/linux/linux_full.c        2006-02-20 08:00:28.000000000 +0100
@@ -0,0 +1,114 @@
+/*-
+ * Copyright (c) 2000 Mark R. V. Murray & Jeroen C. van Gelderen
+ * Copyright (c) 2001-2004 Mark R. V. Murray
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer
+ *    in this position and unchanged.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#include <sys/cdefs.h>
+
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/conf.h>
+#include <sys/uio.h>
+#include <sys/kernel.h>
+#include <sys/malloc.h>
+#include <sys/module.h>
+#include <sys/disk.h>
+#include <sys/bus.h>
+#include <machine/bus.h>
+
+/* For use with destroy_dev(9). */
+static struct cdev *full_dev;
+
+static d_write_t full_write;
+static d_ioctl_t full_ioctl;
+
+#define FULL_MINOR      3
+
+static struct cdevsw full_cdevsw = {
+        .d_version =    D_VERSION,
+        .d_read =       (d_read_t *)nullop,
+        .d_write =      full_write,
+        .d_ioctl =      full_ioctl,
+        .d_name =       "full",
+};
+
+static void *zbuf;
+
+/* ARGSUSED */
+static int
+full_write(struct cdev *dev __unused, struct uio *uio, int flags __unused)
+{
+        uio->uio_resid = 0;
+
+        return (ENOSPC);
+}
+
+/* ARGSUSED */
+static int
+full_ioctl(struct cdev *dev __unused, u_long cmd, caddr_t data __unused,
+    int flags __unused, struct thread *td)
+{
+        int error;
+
+        if (cmd != DIOCSKERNELDUMP)
+                return (ENOIOCTL);
+        error = suser(td);
+        if (error)
+                return (error);
+        return (set_dumper(NULL));
+}
+
+/* ARGSUSED */
+static int
+full_modevent(module_t mod __unused, int type, void *data __unused)
+{
+        switch(type) {
+        case MOD_LOAD:
+                if (bootverbose)
+                        printf("full: <full device>\n");
+                zbuf = (void *)malloc(PAGE_SIZE, M_TEMP, M_WAITOK | M_ZERO);
+                full_dev = make_dev(&full_cdevsw, FULL_MINOR, UID_ROOT,
+                        GID_WHEEL, 0666, "full");
+                break;
+
+        case MOD_UNLOAD:
+                destroy_dev(full_dev);
+                free(zbuf, M_TEMP);
+                break;
+
+        case MOD_SHUTDOWN:
+                break;
+
+        default:
+                return (EOPNOTSUPP);
+        }
+
+        return (0);
+}
+
+DEV_MODULE(full, full_modevent, NULL);
+MODULE_VERSION(full, 1);



From:	Robert Millan <rmh@debian.org>
Date:	Mon, 12 Jul 2004 23:24:20 +0200
Subject:	[PATCH] Implement /dev/full
Send-pr version:	3.113

Number:	68961
Category:	kern
Synopsis:	[PATCH] Implement /dev/full
Severity:	non-critical
Priority:	low
Responsible:	markm@FreeBSD.org
State:	closed
Class:	change-request
Arrival-Date:	Mon Jul 12 21:30:22 GMT 2004
Closed-Date:	Mon Mar 28 12:59:16 GMT 2005
Last-Modified:	Sat Sep 26 12:50:00 UTC 2009
Originator:	Robert Millan
Release:	FreeBSD 5.2.1

Reply via E-mail
From:	"David O'Brien" <obrien@FreeBSD.org>
Date:	Sat, 17 Jul 2004 20:14:51 -0700
I just don't see the point in /dev/full. Could you please give some good examples of its use? Also what "Un*x OSes" besides Linux has this? -- -- David (obrien@FreeBSD.org)

State Changed
From-To:	open->feedback
By:	markm
When:	Sun Aug 1 18:19:30 GMT 2004
Why:	Could I please ask you to re-implement this as part of the Linux emulator? The only OS that we seem to be able to find that uses this is Linux, so it makes most sense to add it to the Linux compatibility layer.

Responsible Changed
From-To:	freebsd-bugs->markm
By:	markm
When:	Sun Aug 1 18:19:30 GMT 2004
Why:	Could I please ask you to re-implement this as part of the Linux emulator? The only OS that we seem to be able to find that uses this is Linux, so it makes most sense to add it to the Linux compatibility layer.

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kern/68961: [PATCH] Implement /dev/full

State Changed
From-To:	feedback->closed
By:	markm
When:	Mon Mar 28 12:57:11 GMT 2005
Why:	It has been agreed/decided by the kernel architect gurus that this is not a good idea right now. Sorry!