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Message-Id: <20071125205150.4e49915f.akpm@linux-foundation.org>
Date: Sun, 25 Nov 2007 20:51:50 -0800
From: Andrew Morton <akpm@...ux-foundation.org>
To: Wagner Ferenc <wferi@...f.hu>
Cc: linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: bonding sysfs output
On Sun, 25 Nov 2007 16:12:57 +0100 Wagner Ferenc <wferi@...f.hu> wrote:
> Hi,
>
> Am I totally of the limit with the attached patch against
> drivers/net/bonding/bond_sysfs.c? I'd like to receive some comments,
> as I'm not a kernel developer.
Plese alwayts cc netdev@...r.kernel.org on networking-related matters.
> I propose it as a fix for trailing NULs and spaces like eg.
>
> $ od -c /sys/class/net/bond0/bonding/slaves
> 0000000 e t h - l e f t e t h - r i g
> 0000020 h t \n \0
> 0000025
>
> I'm afraid there're other problems with "++more++" handling, but let's
> not consider those just yet. Find the patch attached. The first
> hunks also renames buffer to buf, for consistency's shake.
>
> The original version had varying behaviour for Not Applicable cases.
> This patch also settles for empty files (not even a line feed) in
> those cases, but I'm not sure about the general policy on this matter.
>
hm, there are a lot of changes there. Were they all actually needed to fix
the one bug which you have described?
--- bond_sysfs.c.orig 2007-11-16 19:14:27.000000000 +0100
+++ bond_sysfs.c 2007-11-25 16:01:23.092973099 +0100
@@ -74,7 +74,7 @@
* "show" function for the bond_masters attribute.
* The class parameter is ignored.
*/
-static ssize_t bonding_show_bonds(struct class *cls, char *buffer)
+static ssize_t bonding_show_bonds(struct class *cls, char *buf)
{
int res = 0;
struct bonding *bond;
@@ -86,14 +86,13 @@
/* not enough space for another interface name */
if ((PAGE_SIZE - res) > 10)
res = PAGE_SIZE - 10;
- res += sprintf(buffer + res, "++more++");
+ res += sprintf(buf + res, "++more++ ");
break;
}
- res += sprintf(buffer + res, "%s ",
+ res += sprintf(buf + res, "%s ",
bond->dev->name);
}
- res += sprintf(buffer + res, "\n");
- res++;
+ if (res) buf[res-1] = '\n'; /* eat the leftover space */
up_read(&(bonding_rwsem));
return res;
}
@@ -237,14 +236,13 @@
/* not enough space for another interface name */
if ((PAGE_SIZE - res) > 10)
res = PAGE_SIZE - 10;
- res += sprintf(buf + res, "++more++");
+ res += sprintf(buf + res, "++more++ ");
break;
}
res += sprintf(buf + res, "%s ", slave->dev->name);
}
read_unlock_bh(&bond->lock);
- res += sprintf(buf + res, "\n");
- res++;
+ if (res) buf[res-1] = '\n'; /* eat the leftover space */
return res;
}
@@ -401,7 +399,7 @@
return sprintf(buf, "%s %d\n",
bond_mode_tbl[bond->params.mode].modename,
- bond->params.mode) + 1;
+ bond->params.mode);
}
static ssize_t bonding_store_mode(struct device *d,
@@ -452,17 +450,14 @@
struct device_attribute *attr,
char *buf)
{
- int count;
+ int count = 0;
struct bonding *bond = to_bond(d);
- if ((bond->params.mode != BOND_MODE_XOR) &&
- (bond->params.mode != BOND_MODE_8023AD)) {
- // Not Applicable
- count = sprintf(buf, "NA\n") + 1;
- } else {
+ if ((bond->params.mode == BOND_MODE_XOR) ||
+ (bond->params.mode == BOND_MODE_8023AD)) {
count = sprintf(buf, "%s %d\n",
xmit_hashtype_tbl[bond->params.xmit_policy].modename,
- bond->params.xmit_policy) + 1;
+ bond->params.xmit_policy);
}
return count;
@@ -522,7 +517,7 @@
return sprintf(buf, "%s %d\n",
arp_validate_tbl[bond->params.arp_validate].modename,
- bond->params.arp_validate) + 1;
+ bond->params.arp_validate);
}
static ssize_t bonding_store_arp_validate(struct device *d,
@@ -574,7 +569,7 @@
{
struct bonding *bond = to_bond(d);
- return sprintf(buf, "%d\n", bond->params.arp_interval) + 1;
+ return sprintf(buf, "%d\n", bond->params.arp_interval);
}
static ssize_t bonding_store_arp_interval(struct device *d,
@@ -671,10 +666,7 @@
res += sprintf(buf + res, "%u.%u.%u.%u ",
NIPQUAD(bond->params.arp_targets[i]));
}
- if (res)
- res--; /* eat the leftover space */
- res += sprintf(buf + res, "\n");
- res++;
+ if (res) buf[res-1] = '\n'; /* eat the leftover space */
return res;
}
@@ -775,7 +767,7 @@
{
struct bonding *bond = to_bond(d);
- return sprintf(buf, "%d\n", bond->params.downdelay * bond->params.miimon) + 1;
+ return sprintf(buf, "%d\n", bond->params.downdelay * bond->params.miimon);
}
static ssize_t bonding_store_downdelay(struct device *d,
@@ -832,7 +824,7 @@
{
struct bonding *bond = to_bond(d);
- return sprintf(buf, "%d\n", bond->params.updelay * bond->params.miimon) + 1;
+ return sprintf(buf, "%d\n", bond->params.updelay * bond->params.miimon);
}
@@ -896,7 +888,7 @@
return sprintf(buf, "%s %d\n",
bond_lacp_tbl[bond->params.lacp_fast].modename,
- bond->params.lacp_fast) + 1;
+ bond->params.lacp_fast);
}
static ssize_t bonding_store_lacp(struct device *d,
@@ -952,7 +944,7 @@
{
struct bonding *bond = to_bond(d);
- return sprintf(buf, "%d\n", bond->params.miimon) + 1;
+ return sprintf(buf, "%d\n", bond->params.miimon);
}
static ssize_t bonding_store_miimon(struct device *d,
@@ -1053,9 +1045,7 @@
struct bonding *bond = to_bond(d);
if (bond->primary_slave)
- count = sprintf(buf, "%s\n", bond->primary_slave->dev->name) + 1;
- else
- count = sprintf(buf, "\n") + 1;
+ count = sprintf(buf, "%s\n", bond->primary_slave->dev->name);
return count;
}
@@ -1116,7 +1106,7 @@
{
struct bonding *bond = to_bond(d);
- return sprintf(buf, "%d\n", bond->params.use_carrier) + 1;
+ return sprintf(buf, "%d\n", bond->params.use_carrier);
}
static ssize_t bonding_store_carrier(struct device *d,
@@ -1158,7 +1148,7 @@
{
struct slave *curr;
struct bonding *bond = to_bond(d);
- int count;
+ int count = 0;
read_lock(&bond->curr_slave_lock);
@@ -1166,9 +1156,7 @@
read_unlock(&bond->curr_slave_lock);
if (USES_PRIMARY(bond->params.mode) && curr)
- count = sprintf(buf, "%s\n", curr->dev->name) + 1;
- else
- count = sprintf(buf, "\n") + 1;
+ count = sprintf(buf, "%s\n", curr->dev->name);
return count;
}
@@ -1259,7 +1247,7 @@
curr = bond->curr_active_slave;
read_unlock(&bond->curr_slave_lock);
- return sprintf(buf, "%s\n", (curr) ? "up" : "down") + 1;
+ return sprintf(buf, "%s\n", (curr) ? "up" : "down");
}
static DEVICE_ATTR(mii_status, S_IRUGO, bonding_show_mii_status, NULL);
@@ -1276,10 +1264,8 @@
if (bond->params.mode == BOND_MODE_8023AD) {
struct ad_info ad_info;
- count = sprintf(buf, "%d\n", (bond_3ad_get_active_agg_info(bond, &ad_info)) ? 0 : ad_info.aggregator_id) + 1;
+ count = sprintf(buf, "%d\n", (bond_3ad_get_active_agg_info(bond, &ad_info)) ? 0 : ad_info.aggregator_id);
}
- else
- count = sprintf(buf, "\n") + 1;
return count;
}
@@ -1298,10 +1284,8 @@
if (bond->params.mode == BOND_MODE_8023AD) {
struct ad_info ad_info;
- count = sprintf(buf, "%d\n", (bond_3ad_get_active_agg_info(bond, &ad_info)) ? 0: ad_info.ports) + 1;
+ count = sprintf(buf, "%d\n", (bond_3ad_get_active_agg_info(bond, &ad_info)) ? 0: ad_info.ports);
}
- else
- count = sprintf(buf, "\n") + 1;
return count;
}
@@ -1320,10 +1304,8 @@
if (bond->params.mode == BOND_MODE_8023AD) {
struct ad_info ad_info;
- count = sprintf(buf, "%d\n", (bond_3ad_get_active_agg_info(bond, &ad_info)) ? 0 : ad_info.actor_key) + 1;
+ count = sprintf(buf, "%d\n", (bond_3ad_get_active_agg_info(bond, &ad_info)) ? 0 : ad_info.actor_key);
}
- else
- count = sprintf(buf, "\n") + 1;
return count;
}
@@ -1342,10 +1324,8 @@
if (bond->params.mode == BOND_MODE_8023AD) {
struct ad_info ad_info;
- count = sprintf(buf, "%d\n", (bond_3ad_get_active_agg_info(bond, &ad_info)) ? 0 : ad_info.partner_key) + 1;
+ count = sprintf(buf, "%d\n", (bond_3ad_get_active_agg_info(bond, &ad_info)) ? 0 : ad_info.partner_key);
}
- else
- count = sprintf(buf, "\n") + 1;
return count;
}
@@ -1371,11 +1351,9 @@
ad_info.partner_system[2],
ad_info.partner_system[3],
ad_info.partner_system[4],
- ad_info.partner_system[5]) + 1;
+ ad_info.partner_system[5]);
}
}
- else
- count = sprintf(buf, "\n") + 1;
return count;
}
-
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