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Date: Fri, 19 Feb 2010 00:32:26 +0200
From: Octavian Purdila <opurdila@...acom.com>
To: David Miller <davem@...emloft.net>
Cc: Octavian Purdila <opurdila@...acom.com>,
Linux Kernel Network Developers <netdev@...r.kernel.org>,
Linux Kernel Developers <linux-kernel@...r.kernel.org>,
WANG Cong <amwang@...hat.com>,
"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: [net-next PATCH v5 2/3] sysctl: add proc_do_large_bitmap
The new function can be used to read/write large bitmaps via /proc. A
comma separated range format is used for compact output and input
(e.g. 1,3-4,10-10).
Writing into the file will first reset the bitmap then update it
based on the given input.
Signed-off-by: Octavian Purdila <opurdila@...acom.com>
Cc: WANG Cong <amwang@...hat.com>
Cc: Eric W. Biederman <ebiederm@...ssion.com>
---
include/linux/sysctl.h | 2 +
kernel/sysctl.c | 122 ++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 124 insertions(+), 0 deletions(-)
diff --git a/include/linux/sysctl.h b/include/linux/sysctl.h
index f66014c..7bb5cb6 100644
--- a/include/linux/sysctl.h
+++ b/include/linux/sysctl.h
@@ -980,6 +980,8 @@ extern int proc_doulongvec_minmax(struct ctl_table *, int,
void __user *, size_t *, loff_t *);
extern int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int,
void __user *, size_t *, loff_t *);
+extern int proc_do_large_bitmap(struct ctl_table *, int,
+ void __user *, size_t *, loff_t *);
/*
* Register a set of sysctl names by calling register_sysctl_table
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 5259727..ef2c13d 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -2635,6 +2635,128 @@ static int proc_do_cad_pid(struct ctl_table *table, int write,
return 0;
}
+/**
+ * proc_do_large_bitmap - read/write from/to a large bitmap
+ * @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
+ *
+ * The bitmap is stored at table->data and the bitmap length (in bits)
+ * in table->maxlen.
+ *
+ * We use a range comma separated format (e.g. 1,3-4,10-10) so that
+ * large bitmaps may be represented in a compact manner. Writing into
+ * the file will clear the bitmap then update it with the given input.
+ *
+ * Returns 0 on success.
+ */
+int proc_do_large_bitmap(struct ctl_table *table, int write,
+ void __user *_buffer, size_t *lenp, loff_t *ppos)
+{
+ bool first = 1;
+ unsigned long *bitmap = (unsigned long *) table->data;
+ unsigned long bitmap_len = table->maxlen;
+ int left = *lenp, err = 0;
+ char __user *buffer = (char __user *) _buffer;
+ char tr_a[] = { '-', ',', 0 }, tr_b[] = { ',', 0 }, c;
+
+
+ if (!bitmap_len || !left || (*ppos && !write)) {
+ *lenp = 0;
+ return 0;
+ }
+
+ if (write) {
+ bitmap_clear(bitmap, 0, bitmap_len);
+ err = proc_skip_wspace(&buffer, &left);
+ while (!err && left) {
+ unsigned long val_a, val_b;
+ bool neg;
+
+ err = proc_get_ulong(&buffer, &left, tr_a,
+ &val_a, &neg, &c);
+ if (err)
+ break;
+
+ if (val_a >= bitmap_len || neg) {
+ err = -EINVAL;
+ break;
+ }
+
+ if (!left || c != '-') {
+ if (c == ',') {
+ buffer++;
+ left--;
+ }
+ val_b = val_a;
+ goto update;
+ }
+
+ /* skip the - */
+ buffer++; left--;
+
+ err = proc_get_ulong(&buffer, &left, tr_b,
+ &val_b, &neg, &c);
+ if (err)
+ break;
+
+ if (val_b >= bitmap_len || neg || val_a > val_b) {
+ err = -EINVAL;
+ break;
+ }
+
+ if (left && c == ',') {
+ buffer++;
+ left--;
+ }
+
+update:
+ while (val_a <= val_b)
+ set_bit(val_a++, bitmap);
+
+ first = 0; val_b++;
+ }
+ if (!err)
+ err = proc_skip_wspace(&buffer, &left);
+ } else {
+ unsigned long bit_a, bit_b = 0;
+
+ while (left) {
+ bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
+ if (bit_a >= bitmap_len)
+ break;
+ bit_b = find_next_zero_bit(bitmap, bitmap_len,
+ bit_a + 1) - 1;
+
+ err = proc_put_ulong(&buffer, &left, bit_a, 0, first,
+ ',');
+ if (err)
+ break;
+ if (bit_a != bit_b) {
+ err = proc_put_char(&buffer, &left, '-');
+ if (err)
+ break;
+ err = proc_put_ulong(&buffer, &left, bit_b, 0,
+ 1, 0);
+ if (err)
+ break;
+ }
+
+ first = 0; bit_b++;
+ }
+ if (!err)
+ err = proc_put_char(&buffer, &left, '\n');
+ }
+
+ if (write && first)
+ return err;
+ *lenp -= left;
+ *ppos += *lenp;
+ return 0;
+}
+
#else /* CONFIG_PROC_FS */
int proc_dostring(struct ctl_table *table, int write,
--
1.5.6.5
--
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