linux-kernel - sysctl: add proc_dointvec

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Message-ID: <20110304154549.GA14672@darkstar>
Date:	Fri, 4 Mar 2011 23:45:49 +0800
From:	Dave Young <hidave.darkstar@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	David Miller <davem@...emloft.net>,
	Don Zickus <dzickus@...hat.com>, linux-kernel@...r.kernel.org
Subject: sysctl: add proc_dointvec_bool handler

Add proc_dointvec_bool sysctl handler for cases value is limited to 0 and 1

Signed-off-by: Dave Young <hidave.darkstar@...il.com>
---
 include/linux/sysctl.h |    2 ++
 kernel/sysctl.c        |   27 +++++++++++++++++++++++++++
 2 files changed, 29 insertions(+)

--- linux-2.6.orig/kernel/sysctl.c	2011-03-03 11:13:01.986661838 +0800
+++ linux-2.6/kernel/sysctl.c	2011-03-03 11:15:52.196661447 +0800
@@ -2448,6 +2448,33 @@ int proc_dointvec_minmax(struct ctl_tabl
 				do_proc_dointvec_minmax_conv, &param);
 }
 
+/**
+ * proc_dointvec_bool - read a vector of integers with 0/1 values
+ * @table: the sysctl table
+ * @write: %TRUE if this is a write to the sysctl file
+ * @buffer: the user buffer
+ * @lenp: the size of the user buffer
+ * @ppos: file position
+ *
+ * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
+ * values from/to the user buffer, treated as an ASCII string.
+ *
+ * This routine will ensure the values are either 0 or 1.
+ *
+ * Returns 0 on success.
+ */
+int proc_dointvec_bool(struct ctl_table *table, int write,
+		  void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+	struct do_proc_dointvec_minmax_conv_param param = {
+		.min = &zero,
+		.max = &one,
+	};
+	return do_proc_dointvec(table, write, buffer, lenp, ppos,
+				do_proc_dointvec_minmax_conv, &param);
+}
+EXPORT_SYMBOL(proc_dointvec_bool);
+
 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
 				     void __user *buffer,
 				     size_t *lenp, loff_t *ppos,
--- linux-2.6.orig/include/linux/sysctl.h	2010-06-22 14:02:49.000000000 +0800
+++ linux-2.6/include/linux/sysctl.h	2011-03-03 11:16:16.119994725 +0800
@@ -970,6 +970,8 @@ extern int proc_dointvec(struct ctl_tabl
 			 void __user *, size_t *, loff_t *);
 extern int proc_dointvec_minmax(struct ctl_table *, int,
 				void __user *, size_t *, loff_t *);
+extern int proc_dointvec_bool(struct ctl_table *, int,
+				void __user *, size_t *, loff_t *);
 extern int proc_dointvec_jiffies(struct ctl_table *, int,
 				 void __user *, size_t *, loff_t *);
 extern int proc_dointvec_userhz_jiffies(struct ctl_table *, int,
--
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