patch-2.0.37 linux/drivers/block/proc_array.c

• Lines: 120
• Date: Sun Jun 13 10:21:00 1999
• Orig file: v2.0.36/linux/drivers/block/proc_array.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.0.36/linux/drivers/block/proc_array.c linux/drivers/block/proc_array.c
@@ -0,0 +1,119 @@
+/*
+ *  Taken from linux/fs/proc/net.c
+ *
+ *  Copyright (C) 1991, 1992 Linus Torvalds
+ *
+ *  gjh 3/'93 heim@peanuts.informatik.uni-tuebingen.de (Gerald J. Heim)
+ *            most of this file is stolen from base.c
+ *            it works, but you shouldn't use it as a guideline
+ *            for new proc-fs entries. once i'll make it better.
+ * fvk 3/'93  waltje@uwalt.nl.mugnet.org (Fred N. van Kempen)
+ *	      cleaned up the whole thing, moved "net" specific code to
+ *	      the NET kernel layer (where it belonged in the first place).
+ * Michael K. Johnson (johnsonm@stolaf.edu) 3/93
+ *            Added support from my previous inet.c.  Cleaned things up
+ *            quite a bit, modularized the code.
+ * fvk 4/'93  waltje@uwalt.nl.mugnet.org (Fred N. van Kempen)
+ *	      Renamed "route_get_info()" to "rt_get_info()" for consistency.
+ * Alan Cox (gw4pts@gw4pts.ampr.org) 4/94
+ *	      Dusted off the code and added IPX. Fixed the 4K limit.
+ * Erik Schoenfelder (schoenfr@ibr.cs.tu-bs.de)
+ *	      /proc/net/snmp.
+ * Alan Cox (gw4pts@gw4pts.ampr.org) 1/95
+ *	      Added Appletalk slots
+ *
+ *  proc diskarray directory handling functions
+ */
+#include <linux/errno.h>
+#include <linux/sched.h>
+#include <linux/proc_fs.h>
+#include <linux/stat.h>
+#include <linux/fcntl.h>
+#include <linux/mm.h>
+
+#include <asm/segment.h>
+
+#define PROC_BLOCK_SIZE	(3*1024)		/* 4K page size but our output routines use some slack for overruns */
+
+static int proc_readdiskarray(struct inode * inode, struct file * file,
+			char * buf, int count)
+{
+	char * page;
+	int bytes=count;
+	int copied=0;
+	char *start;
+	struct proc_dir_entry * dp;
+
+	if (count < 0)
+		return -EINVAL;
+	dp = (struct proc_dir_entry *) inode->u.generic_ip;
+	if (!(page = (char*) __get_free_page(GFP_KERNEL)))
+		return -ENOMEM;
+
+	while (bytes>0)
+	{
+		int length, thistime=bytes;
+		if (bytes > PROC_BLOCK_SIZE)
+			thistime=PROC_BLOCK_SIZE;
+
+		length = dp->get_info(page, &start,
+				      file->f_pos,
+				      thistime, (int)dp);
+
+		/*
+ 		 *	We have been given a non page aligned block of
+		 *	the data we asked for + a bit. We have been given
+ 		 *	the start pointer and we know the length.. 
+		 */
+
+		if (length <= 0)
+			break;
+		/*
+ 		 *	Copy the bytes
+		 */
+		memcpy_tofs(buf+copied, start, length);
+		file->f_pos += length;	/* Move down the file */
+		bytes  -= length;
+		copied += length;
+		if (length<thistime)
+			break;	/* End of file */
+	}
+	free_page((unsigned long) page);
+	return copied;
+}
+
+static struct file_operations proc_diskarray_operations = {
+	NULL,			/* lseek - default */
+	proc_readdiskarray,		/* read - bad */
+	NULL,			/* write - bad */
+	NULL,			/* readdir */
+	NULL,			/* select - default */
+	NULL,			/* ioctl - default */
+	NULL,			/* mmap */
+	NULL,			/* no special open code */
+	NULL,			/* no special release code */
+	NULL			/* can't fsync */
+};
+
+/*
+ * proc directories can do almost nothing..
+ */
+struct inode_operations proc_diskarray_inode_operations = {
+	&proc_diskarray_operations,	/* default diskarray file-ops */
+	NULL,			/* create */
+	NULL,			/* lookup */
+	NULL,			/* link */
+	NULL,			/* unlink */
+	NULL,			/* symlink */
+	NULL,			/* mkdir */
+	NULL,			/* rmdir */
+	NULL,			/* mknod */
+	NULL,			/* rename */
+	NULL,			/* readlink */
+	NULL,			/* follow_link */
+	NULL,			/* readpage */
+	NULL,			/* writepage */
+	NULL,			/* bmap */
+	NULL,			/* truncate */
+	NULL			/* permission */
+};