From: Dave Young <hidave.darkstar@gmail.com>
Date: Wed, 3 Aug 2011 00:53:03 +0000 (+1000)
Subject: Add a proc_dointvec_bool() sysctl handler for cases where the input value
X-Git-Tag: next-20110816~1^2~8
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=572d34074e1332459aaaabc435e5bbbdf98d6215;p=karo-tx-linux.git

Add a proc_dointvec_bool() sysctl handler for cases where the input value
is limited to 0 and 1.

Signed-off-by: Dave Young <hidave.darkstar@gmail.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

diff --git a/include/linux/sysctl.h b/include/linux/sysctl.h
index 11684d9e6bd2..991736ef9687 100644
--- a/include/linux/sysctl.h
+++ b/include/linux/sysctl.h
@@ -971,6 +971,8 @@ extern int proc_dointvec(struct ctl_table *, int,
 			 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,
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 4f057f9c0c43..6c9414640f7c 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -2477,6 +2477,33 @@ int proc_dointvec_minmax(struct ctl_table *table, int write,
 				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,