patch-2.1.66 linux/drivers/char/ftape/zftape/zftape-buffers.c

• Lines: 161
• Date: Tue Nov 25 14:45:28 1997
• Orig file: v2.1.65/linux/drivers/char/ftape/zftape/zftape-buffers.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.65/linux/drivers/char/ftape/zftape/zftape-buffers.c linux/drivers/char/ftape/zftape/zftape-buffers.c
@@ -0,0 +1,160 @@
+/*
+ *      Copyright (C) 1995-1997 Claus-Justus Heine.
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2, or (at your option)
+ any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; see the file COPYING.  If not, write to
+ the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+
+ *
+ * $Source: /homes/cvs/ftape-stacked/ftape/zftape/zftape-buffers.c,v $
+ * $Revision: 1.2 $
+ * $Date: 1997/10/05 19:18:59 $
+ *
+ *      This file contains the dynamic buffer allocation routines 
+ *      of zftape
+ */
+
+#include <linux/errno.h>
+#include <linux/mm.h>
+#include <linux/malloc.h>
+#include <asm/segment.h>
+
+#include <linux/zftape.h>
+
+#if LINUX_VERSION_CODE >= KERNEL_VER(2,1,0)
+#include <linux/vmalloc.h>
+#endif
+
+#include "../zftape/zftape-init.h"
+#include "../zftape/zftape-eof.h"
+#include "../zftape/zftape-ctl.h"
+#include "../zftape/zftape-write.h"
+#include "../zftape/zftape-read.h"
+#include "../zftape/zftape-rw.h"
+#include "../zftape/zftape-vtbl.h"
+
+/*  global variables
+ */
+
+/*  local varibales
+ */
+static unsigned int used_memory = 0;
+static unsigned int peak_memory = 0;
+
+void zft_memory_stats(void)
+{
+	TRACE_FUN(ft_t_flow);
+
+	TRACE(ft_t_noise, "Memory usage (vmalloc allocations):\n"
+	      KERN_INFO "total allocated: %d\n"
+	      KERN_INFO "peak allocation: %d",
+	      used_memory, peak_memory);
+	peak_memory = used_memory;
+	TRACE_EXIT;
+}
+
+int zft_vcalloc_once(void *new, size_t size)
+{
+	TRACE_FUN(ft_t_flow);
+	if (zft_vmalloc_once(new, size) < 0) {
+		TRACE_EXIT -ENOMEM;
+	}
+	memset(*(void **)new, '\0', size);
+	TRACE_EXIT 0;
+}
+int zft_vmalloc_once(void *new, size_t size)
+{
+	TRACE_FUN(ft_t_flow);
+
+	if (*(void **)new != NULL || size == 0) {
+		TRACE_EXIT 0;
+	}
+	if ((*(void **)new = vmalloc(size)) == NULL) {
+		TRACE_EXIT -ENOMEM;
+	}
+	used_memory += size;
+	if (peak_memory < used_memory) {
+		peak_memory = used_memory;
+	}
+	TRACE_ABORT(0, ft_t_noise,
+		    "allocated buffer @ %p, %d bytes", *(void **)new, size);
+}
+int zft_vcalloc_always(void *new, size_t size)
+{
+	TRACE_FUN(ft_t_flow);
+
+	zft_vfree(new, size);
+	TRACE_EXIT zft_vcalloc_once(new, size);
+}
+int zft_vmalloc_always(void *new, size_t size)
+{
+	TRACE_FUN(ft_t_flow);
+
+	zft_vfree(new, size);
+	TRACE_EXIT zft_vmalloc_once(new, size);
+}
+void zft_vfree(void *old, size_t size)
+{
+	TRACE_FUN(ft_t_flow);
+
+	if (*(void **)old) {
+		vfree(*(void **)old);
+		used_memory -= size;
+		TRACE(ft_t_noise, "released buffer @ %p, %d bytes",
+		      *(void **)old, size);
+		*(void **)old = NULL;
+	}
+	TRACE_EXIT;
+}
+
+void *zft_kmalloc(size_t size)
+{
+	void *new;
+
+	while ((new = kmalloc(size, GFP_KERNEL)) == NULL) {
+		current->timeout = HZ/10;
+		current->state   = TASK_INTERRUPTIBLE;
+		schedule();
+	}
+	memset(new, 0, size);
+	used_memory += size;
+	if (peak_memory < used_memory) {
+		peak_memory = used_memory;
+	}
+	return new;
+}
+
+void zft_kfree(void *old, size_t size)
+{
+	kfree(old);
+	used_memory -= size;
+}
+
+/* there are some more buffers that are allocated on demand.
+ * cleanup_module() calles this function to be sure to have released
+ * them 
+ */
+void zft_uninit_mem(void)
+{
+	TRACE_FUN(ft_t_flow);
+
+	zft_vfree(&zft_hseg_buf, FT_SEGMENT_SIZE);
+	zft_vfree(&zft_deblock_buf, FT_SEGMENT_SIZE); zft_deblock_segment = -1;
+	zft_free_vtbl();
+	if (zft_cmpr_lock(0 /* don't load */) == 0) {
+		(*zft_cmpr_ops->cleanup)();
+		(*zft_cmpr_ops->reset)(); /* unlock it again */
+	}
+	zft_memory_stats();
+	TRACE_EXIT;
+}