From 1f33c41c03daece85a84b8dcea5733f3efe3e2b0 Mon Sep 17 00:00:00 2001
From: Joe Perches <joe@perches.com>
Date: Mon, 29 Sep 2014 16:08:21 -0700
Subject: [PATCH 1/8] seq_file: Rename seq_overflow() to seq_has_overflowed()
and make public
The return values of seq_printf/puts/putc are frequently misused.
Start down a path to remove all the return value uses of these
functions.
Move the seq_overflow() to a global inlined function called
seq_has_overflowed() that can be used by the users of seq_file() calls.
Update the documentation to not show return types for seq_printf
et al. Add a description of seq_has_overflowed().
Link: http://lkml.kernel.org/p/848ac7e3d1c31cddf638a8526fa3c59fa6fdeb8a.1412031505.git.joe@perches.com
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Joe Perches <joe@perches.com>
[ Reworked the original patch from Joe ]
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
---
Documentation/filesystems/seq_file.txt | 22 +++++++++++++---------
fs/seq_file.c | 15 ++-------------
include/linux/seq_file.h | 15 +++++++++++++++
3 files changed, 30 insertions(+), 22 deletions(-)
diff --git a/Documentation/filesystems/seq_file.txt b/Documentation/filesystems/seq_file.txt
index 8ea3e90ace07..b797ed38de46 100644
--- a/Documentation/filesystems/seq_file.txt
+++ b/Documentation/filesystems/seq_file.txt
@@ -180,23 +180,19 @@ output must be passed to the seq_file code. Some utility functions have
been defined which make this task easy.
Most code will simply use seq_printf(), which works pretty much like
-printk(), but which requires the seq_file pointer as an argument. It is
-common to ignore the return value from seq_printf(), but a function
-producing complicated output may want to check that value and quit if
-something non-zero is returned; an error return means that the seq_file
-buffer has been filled and further output will be discarded.
+printk(), but which requires the seq_file pointer as an argument.
For straight character output, the following functions may be used:
- int seq_putc(struct seq_file *m, char c);
- int seq_puts(struct seq_file *m, const char *s);
- int seq_escape(struct seq_file *m, const char *s, const char *esc);
+ seq_putc(struct seq_file *m, char c);
+ seq_puts(struct seq_file *m, const char *s);
+ seq_escape(struct seq_file *m, const char *s, const char *esc);
The first two output a single character and a string, just like one would
expect. seq_escape() is like seq_puts(), except that any character in s
which is in the string esc will be represented in octal form in the output.
-There is also a pair of functions for printing filenames:
+There are also a pair of functions for printing filenames:
int seq_path(struct seq_file *m, struct path *path, char *esc);
int seq_path_root(struct seq_file *m, struct path *path,
@@ -209,6 +205,14 @@ root is desired, it can be used with seq_path_root(). Note that, if it
turns out that path cannot be reached from root, the value of root will be
changed in seq_file_root() to a root which *does* work.
+A function producing complicated output may want to check
+ bool seq_has_overflowed(struct seq_file *m);
+and avoid further seq_<output> calls if true is returned.
+
+A true return from seq_has_overflowed means that the seq_file buffer will
+be discarded and the seq_show function will attempt to allocate a larger
+buffer and retry printing.
+
Making it all work
diff --git a/fs/seq_file.c b/fs/seq_file.c
index 3857b720cb1b..353948ba1c5b 100644
--- a/fs/seq_file.c
+++ b/fs/seq_file.c
@@ -16,17 +16,6 @@
#include <asm/uaccess.h>
#include <asm/page.h>
-
-/*
- * seq_files have a buffer which can may overflow. When this happens a larger
- * buffer is reallocated and all the data will be printed again.
- * The overflow state is true when m->count == m->size.
- */
-static bool seq_overflow(struct seq_file *m)
-{
- return m->count == m->size;
-}
-
static void seq_set_overflow(struct seq_file *m)
{
m->count = m->size;
@@ -124,7 +113,7 @@ static int traverse(struct seq_file *m, loff_t offset)
error = 0;
m->count = 0;
}
- if (seq_overflow(m))
+ if (seq_has_overflowed(m))
goto Eoverflow;
if (pos + m->count > offset) {
m->from = offset - pos;
@@ -267,7 +256,7 @@ ssize_t seq_read(struct file *file, char __user *buf, size_t size, loff_t *ppos)
break;
}
err = m->op->show(m, p);
- if (seq_overflow(m) || err) {
+ if (seq_has_overflowed(m) || err) {
m->count = offs;
if (likely(err <= 0))
break;
diff --git a/include/linux/seq_file.h b/include/linux/seq_file.h
index 52e0097f61f0..cf6a9daaaf6d 100644
--- a/include/linux/seq_file.h
+++ b/include/linux/seq_file.h
@@ -42,6 +42,21 @@ struct seq_operations {
#define SEQ_SKIP 1
+/**
+ * seq_has_overflowed - check if the buffer has overflowed
+ * @m: the seq_file handle
+ *
+ * seq_files have a buffer which may overflow. When this happens a larger
+ * buffer is reallocated and all the data will be printed again.
+ * The overflow state is true when m->count == m->size.
+ *
+ * Returns true if the buffer received more than it can hold.
+ */
+static inline bool seq_has_overflowed(struct seq_file *m)
+{
+ return m->count == m->size;
+}
+
/**
* seq_get_buf - get buffer to write arbitrary data to
* @m: the seq_file handle
From 37246a583715e2258d7c5cfecbd9fff0f9fa4b5d Mon Sep 17 00:00:00 2001
From: "Steven Rostedt (Red Hat)" <rostedt@goodmis.org>
Date: Mon, 27 Oct 2014 16:02:47 -0400
Subject: [PATCH 2/8] netfilter: Remove return values for print_conntrack
callbacks
The seq_printf() and friends are having their return values removed.
The print_conntrack() returns the result of seq_printf(), which is
meaningless when seq_printf() returns void. Might as well remove the
return values of print_conntrack() as well.
Link: http://lkml.kernel.org/r/20141029220107.465008329@goodmis.org
Acked-by: Pablo Neira Ayuso <pablo@netfilter.org>
Cc: Patrick McHardy <kaber@trash.net>
Cc: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
Cc: netfilter-devel@vger.kernel.org
Cc: coreteam@netfilter.org
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
---
include/net/netfilter/nf_conntrack_l4proto.h | 2 +-
net/ipv4/netfilter/nf_conntrack_l3proto_ipv4_compat.c | 5 ++++-
net/netfilter/nf_conntrack_proto_dccp.c | 4 ++--
net/netfilter/nf_conntrack_proto_gre.c | 8 ++++----
net/netfilter/nf_conntrack_proto_sctp.c | 4 ++--
net/netfilter/nf_conntrack_proto_tcp.c | 4 ++--
net/netfilter/nf_conntrack_standalone.c | 4 ++--
7 files changed, 17 insertions(+), 14 deletions(-)
diff --git a/include/net/netfilter/nf_conntrack_l4proto.h b/include/net/netfilter/nf_conntrack_l4proto.h
index 4c8d573830b7..82e4ec002a39 100644
--- a/include/net/netfilter/nf_conntrack_l4proto.h
+++ b/include/net/netfilter/nf_conntrack_l4proto.h
@@ -60,7 +60,7 @@ struct nf_conntrack_l4proto {
const struct nf_conntrack_tuple *);
/* Print out the private part of the conntrack. */
- int (*print_conntrack)(struct seq_file *s, struct nf_conn *);
+ void (*print_conntrack)(struct seq_file *s, struct nf_conn *);
/* Return the array of timeouts for this protocol. */
unsigned int *(*get_timeouts)(struct net *net);
diff --git a/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4_compat.c b/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4_compat.c
index 4c48e434bb1f..91f207c2cb69 100644
--- a/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4_compat.c
+++ b/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4_compat.c
@@ -147,7 +147,10 @@ static int ct_seq_show(struct seq_file *s, void *v)
? (long)(ct->timeout.expires - jiffies)/HZ : 0) != 0)
goto release;
- if (l4proto->print_conntrack && l4proto->print_conntrack(s, ct))
+ if (l4proto->print_conntrack)
+ l4proto->print_conntrack(s, ct);
+
+ if (seq_has_overflowed(s))
goto release;
if (print_tuple(s, &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
diff --git a/net/netfilter/nf_conntrack_proto_dccp.c b/net/netfilter/nf_conntrack_proto_dccp.c
index cb372f96f10d..15971177470a 100644
--- a/net/netfilter/nf_conntrack_proto_dccp.c
+++ b/net/netfilter/nf_conntrack_proto_dccp.c
@@ -626,9 +626,9 @@ static int dccp_print_tuple(struct seq_file *s,
ntohs(tuple->dst.u.dccp.port));
}
-static int dccp_print_conntrack(struct seq_file *s, struct nf_conn *ct)
+static void dccp_print_conntrack(struct seq_file *s, struct nf_conn *ct)
{
- return seq_printf(s, "%s ", dccp_state_names[ct->proto.dccp.state]);
+ seq_printf(s, "%s ", dccp_state_names[ct->proto.dccp.state]);
}
#if IS_ENABLED(CONFIG_NF_CT_NETLINK)
diff --git a/net/netfilter/nf_conntrack_proto_gre.c b/net/netfilter/nf_conntrack_proto_gre.c
index d5665739e3b1..cba607ada069 100644
--- a/net/netfilter/nf_conntrack_proto_gre.c
+++ b/net/netfilter/nf_conntrack_proto_gre.c
@@ -235,11 +235,11 @@ static int gre_print_tuple(struct seq_file *s,
}
/* print private data for conntrack */
-static int gre_print_conntrack(struct seq_file *s, struct nf_conn *ct)
+static void gre_print_conntrack(struct seq_file *s, struct nf_conn *ct)
{
- return seq_printf(s, "timeout=%u, stream_timeout=%u ",
- (ct->proto.gre.timeout / HZ),
- (ct->proto.gre.stream_timeout / HZ));
+ seq_printf(s, "timeout=%u, stream_timeout=%u ",
+ (ct->proto.gre.timeout / HZ),
+ (ct->proto.gre.stream_timeout / HZ));
}
static unsigned int *gre_get_timeouts(struct net *net)
diff --git a/net/netfilter/nf_conntrack_proto_sctp.c b/net/netfilter/nf_conntrack_proto_sctp.c
index 1314d33f6bcf..c61f4cd6407d 100644
--- a/net/netfilter/nf_conntrack_proto_sctp.c
+++ b/net/netfilter/nf_conntrack_proto_sctp.c
@@ -175,7 +175,7 @@ static int sctp_print_tuple(struct seq_file *s,
}
/* Print out the private part of the conntrack. */
-static int sctp_print_conntrack(struct seq_file *s, struct nf_conn *ct)
+static void sctp_print_conntrack(struct seq_file *s, struct nf_conn *ct)
{
enum sctp_conntrack state;
@@ -183,7 +183,7 @@ static int sctp_print_conntrack(struct seq_file *s, struct nf_conn *ct)
state = ct->proto.sctp.state;
spin_unlock_bh(&ct->lock);
- return seq_printf(s, "%s ", sctp_conntrack_names[state]);
+ seq_printf(s, "%s ", sctp_conntrack_names[state]);
}
#define for_each_sctp_chunk(skb, sch, _sch, offset, dataoff, count) \
diff --git a/net/netfilter/nf_conntrack_proto_tcp.c b/net/netfilter/nf_conntrack_proto_tcp.c
index 44d1ea32570a..79668fd3db96 100644
--- a/net/netfilter/nf_conntrack_proto_tcp.c
+++ b/net/netfilter/nf_conntrack_proto_tcp.c
@@ -311,7 +311,7 @@ static int tcp_print_tuple(struct seq_file *s,
}
/* Print out the private part of the conntrack. */
-static int tcp_print_conntrack(struct seq_file *s, struct nf_conn *ct)
+static void tcp_print_conntrack(struct seq_file *s, struct nf_conn *ct)
{
enum tcp_conntrack state;
@@ -319,7 +319,7 @@ static int tcp_print_conntrack(struct seq_file *s, struct nf_conn *ct)
state = ct->proto.tcp.state;
spin_unlock_bh(&ct->lock);
- return seq_printf(s, "%s ", tcp_conntrack_names[state]);
+ seq_printf(s, "%s ", tcp_conntrack_names[state]);
}
static unsigned int get_conntrack_index(const struct tcphdr *tcph)
diff --git a/net/netfilter/nf_conntrack_standalone.c b/net/netfilter/nf_conntrack_standalone.c
index cf65a1e040dd..348aa3602787 100644
--- a/net/netfilter/nf_conntrack_standalone.c
+++ b/net/netfilter/nf_conntrack_standalone.c
@@ -199,8 +199,8 @@ static int ct_seq_show(struct seq_file *s, void *v)
? (long)(ct->timeout.expires - jiffies)/HZ : 0) != 0)
goto release;
- if (l4proto->print_conntrack && l4proto->print_conntrack(s, ct))
- goto release;
+ if (l4proto->print_conntrack)
+ l4proto->print_conntrack(s, ct);
if (print_tuple(s, &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
l3proto, l4proto))
From 824f1fbee7bbbd850cdb62d3f95143fad4719e20 Mon Sep 17 00:00:00 2001
From: Joe Perches <joe@perches.com>
Date: Mon, 29 Sep 2014 16:08:22 -0700
Subject: [PATCH 3/8] netfilter: Convert print_tuple functions to return void
Since adding a new function to seq_file (seq_has_overflowed())
there isn't any value for functions called from seq_show to
return anything. Remove the int returns of the various
print_tuple/<foo>_print_tuple functions.
Link: http://lkml.kernel.org/p/f2e8cf8df433a197daa62cbaf124c900c708edc7.1412031505.git.joe@perches.com
Cc: Pablo Neira Ayuso <pablo@netfilter.org>
Cc: Patrick McHardy <kaber@trash.net>
Cc: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
Cc: netfilter-devel@vger.kernel.org
Cc: coreteam@netfilter.org
Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
---
include/net/netfilter/nf_conntrack_core.h | 2 +-
include/net/netfilter/nf_conntrack_l3proto.h | 4 ++--
include/net/netfilter/nf_conntrack_l4proto.h | 4 ++--
net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c | 6 +++---
.../netfilter/nf_conntrack_l3proto_ipv4_compat.c | 12 ++++++++----
net/ipv4/netfilter/nf_conntrack_proto_icmp.c | 10 +++++-----
net/ipv6/netfilter/nf_conntrack_l3proto_ipv6.c | 6 +++---
net/ipv6/netfilter/nf_conntrack_proto_icmpv6.c | 10 +++++-----
net/netfilter/nf_conntrack_l3proto_generic.c | 5 ++---
net/netfilter/nf_conntrack_proto_dccp.c | 10 +++++-----
net/netfilter/nf_conntrack_proto_generic.c | 5 ++---
net/netfilter/nf_conntrack_proto_gre.c | 10 +++++-----
net/netfilter/nf_conntrack_proto_sctp.c | 10 +++++-----
net/netfilter/nf_conntrack_proto_tcp.c | 10 +++++-----
net/netfilter/nf_conntrack_proto_udp.c | 10 +++++-----
net/netfilter/nf_conntrack_proto_udplite.c | 10 +++++-----
net/netfilter/nf_conntrack_standalone.c | 15 +++++++--------
17 files changed, 70 insertions(+), 69 deletions(-)
diff --git a/include/net/netfilter/nf_conntrack_core.h b/include/net/netfilter/nf_conntrack_core.h
index cc0c18827602..f2f0fa3bb150 100644
--- a/include/net/netfilter/nf_conntrack_core.h
+++ b/include/net/netfilter/nf_conntrack_core.h
@@ -72,7 +72,7 @@ static inline int nf_conntrack_confirm(struct sk_buff *skb)
return ret;
}
-int
+void
print_tuple(struct seq_file *s, const struct nf_conntrack_tuple *tuple,
const struct nf_conntrack_l3proto *l3proto,
const struct nf_conntrack_l4proto *proto);
diff --git a/include/net/netfilter/nf_conntrack_l3proto.h b/include/net/netfilter/nf_conntrack_l3proto.h
index adc1fa3dd7ab..cdc920b4c4c2 100644
--- a/include/net/netfilter/nf_conntrack_l3proto.h
+++ b/include/net/netfilter/nf_conntrack_l3proto.h
@@ -38,8 +38,8 @@ struct nf_conntrack_l3proto {
const struct nf_conntrack_tuple *orig);
/* Print out the per-protocol part of the tuple. */
- int (*print_tuple)(struct seq_file *s,
- const struct nf_conntrack_tuple *);
+ void (*print_tuple)(struct seq_file *s,
+ const struct nf_conntrack_tuple *);
/*
* Called before tracking.
diff --git a/include/net/netfilter/nf_conntrack_l4proto.h b/include/net/netfilter/nf_conntrack_l4proto.h
index 82e4ec002a39..1f7061313d54 100644
--- a/include/net/netfilter/nf_conntrack_l4proto.h
+++ b/include/net/netfilter/nf_conntrack_l4proto.h
@@ -56,8 +56,8 @@ struct nf_conntrack_l4proto {
u_int8_t pf, unsigned int hooknum);
/* Print out the per-protocol part of the tuple. Return like seq_* */
- int (*print_tuple)(struct seq_file *s,
- const struct nf_conntrack_tuple *);
+ void (*print_tuple)(struct seq_file *s,
+ const struct nf_conntrack_tuple *);
/* Print out the private part of the conntrack. */
void (*print_conntrack)(struct seq_file *s, struct nf_conn *);
diff --git a/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c b/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c
index a054fe083431..5c61328b7704 100644
--- a/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c
+++ b/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c
@@ -56,11 +56,11 @@ static bool ipv4_invert_tuple(struct nf_conntrack_tuple *tuple,
return true;
}
-static int ipv4_print_tuple(struct seq_file *s,
+static void ipv4_print_tuple(struct seq_file *s,
const struct nf_conntrack_tuple *tuple)
{
- return seq_printf(s, "src=%pI4 dst=%pI4 ",
- &tuple->src.u3.ip, &tuple->dst.u3.ip);
+ seq_printf(s, "src=%pI4 dst=%pI4 ",
+ &tuple->src.u3.ip, &tuple->dst.u3.ip);
}
static int ipv4_get_l4proto(const struct sk_buff *skb, unsigned int nhoff,
diff --git a/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4_compat.c b/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4_compat.c
index 91f207c2cb69..d927f9e72130 100644
--- a/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4_compat.c
+++ b/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4_compat.c
@@ -153,8 +153,10 @@ static int ct_seq_show(struct seq_file *s, void *v)
if (seq_has_overflowed(s))
goto release;
- if (print_tuple(s, &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
- l3proto, l4proto))
+ print_tuple(s, &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
+ l3proto, l4proto);
+
+ if (seq_has_overflowed(s))
goto release;
if (seq_print_acct(s, ct, IP_CT_DIR_ORIGINAL))
@@ -164,8 +166,10 @@ static int ct_seq_show(struct seq_file *s, void *v)
if (seq_printf(s, "[UNREPLIED] "))
goto release;
- if (print_tuple(s, &ct->tuplehash[IP_CT_DIR_REPLY].tuple,
- l3proto, l4proto))
+ print_tuple(s, &ct->tuplehash[IP_CT_DIR_REPLY].tuple,
+ l3proto, l4proto);
+
+ if (seq_has_overflowed(s))
goto release;
if (seq_print_acct(s, ct, IP_CT_DIR_REPLY))
diff --git a/net/ipv4/netfilter/nf_conntrack_proto_icmp.c b/net/ipv4/netfilter/nf_conntrack_proto_icmp.c
index b91b2641adda..80d5554b9a88 100644
--- a/net/ipv4/netfilter/nf_conntrack_proto_icmp.c
+++ b/net/ipv4/netfilter/nf_conntrack_proto_icmp.c
@@ -72,13 +72,13 @@ static bool icmp_invert_tuple(struct nf_conntrack_tuple *tuple,
}
/* Print out the per-protocol part of the tuple. */
-static int icmp_print_tuple(struct seq_file *s,
+static void icmp_print_tuple(struct seq_file *s,
const struct nf_conntrack_tuple *tuple)
{
- return seq_printf(s, "type=%u code=%u id=%u ",
- tuple->dst.u.icmp.type,
- tuple->dst.u.icmp.code,
- ntohs(tuple->src.u.icmp.id));
+ seq_printf(s, "type=%u code=%u id=%u ",
+ tuple->dst.u.icmp.type,
+ tuple->dst.u.icmp.code,
+ ntohs(tuple->src.u.icmp.id));
}
static unsigned int *icmp_get_timeouts(struct net *net)
diff --git a/net/ipv6/netfilter/nf_conntrack_l3proto_ipv6.c b/net/ipv6/netfilter/nf_conntrack_l3proto_ipv6.c
index 4cbc6b290dd5..b68d0e59c1f8 100644
--- a/net/ipv6/netfilter/nf_conntrack_l3proto_ipv6.c
+++ b/net/ipv6/netfilter/nf_conntrack_l3proto_ipv6.c
@@ -60,11 +60,11 @@ static bool ipv6_invert_tuple(struct nf_conntrack_tuple *tuple,
return true;
}
-static int ipv6_print_tuple(struct seq_file *s,
+static void ipv6_print_tuple(struct seq_file *s,
const struct nf_conntrack_tuple *tuple)
{
- return seq_printf(s, "src=%pI6 dst=%pI6 ",
- tuple->src.u3.ip6, tuple->dst.u3.ip6);
+ seq_printf(s, "src=%pI6 dst=%pI6 ",
+ tuple->src.u3.ip6, tuple->dst.u3.ip6);
}
static int ipv6_get_l4proto(const struct sk_buff *skb, unsigned int nhoff,
diff --git a/net/ipv6/netfilter/nf_conntrack_proto_icmpv6.c b/net/ipv6/netfilter/nf_conntrack_proto_icmpv6.c
index b3807c5cb888..90388d606483 100644
--- a/net/ipv6/netfilter/nf_conntrack_proto_icmpv6.c
+++ b/net/ipv6/netfilter/nf_conntrack_proto_icmpv6.c
@@ -84,13 +84,13 @@ static bool icmpv6_invert_tuple(struct nf_conntrack_tuple *tuple,
}
/* Print out the per-protocol part of the tuple. */
-static int icmpv6_print_tuple(struct seq_file *s,
+static void icmpv6_print_tuple(struct seq_file *s,
const struct nf_conntrack_tuple *tuple)
{
- return seq_printf(s, "type=%u code=%u id=%u ",
- tuple->dst.u.icmp.type,
- tuple->dst.u.icmp.code,
- ntohs(tuple->src.u.icmp.id));
+ seq_printf(s, "type=%u code=%u id=%u ",
+ tuple->dst.u.icmp.type,
+ tuple->dst.u.icmp.code,
+ ntohs(tuple->src.u.icmp.id));
}
static unsigned int *icmpv6_get_timeouts(struct net *net)
diff --git a/net/netfilter/nf_conntrack_l3proto_generic.c b/net/netfilter/nf_conntrack_l3proto_generic.c
index e7eb807fe07d..cf9ace70bece 100644
--- a/net/netfilter/nf_conntrack_l3proto_generic.c
+++ b/net/netfilter/nf_conntrack_l3proto_generic.c
@@ -49,10 +49,9 @@ static bool generic_invert_tuple(struct nf_conntrack_tuple *tuple,
return true;
}
-static int generic_print_tuple(struct seq_file *s,
- const struct nf_conntrack_tuple *tuple)
+static void generic_print_tuple(struct seq_file *s,
+ const struct nf_conntrack_tuple *tuple)
{
- return 0;
}
static int generic_get_l4proto(const struct sk_buff *skb, unsigned int nhoff,
diff --git a/net/netfilter/nf_conntrack_proto_dccp.c b/net/netfilter/nf_conntrack_proto_dccp.c
index 15971177470a..6dd995c7c72b 100644
--- a/net/netfilter/nf_conntrack_proto_dccp.c
+++ b/net/netfilter/nf_conntrack_proto_dccp.c
@@ -618,12 +618,12 @@ static int dccp_error(struct net *net, struct nf_conn *tmpl,
return -NF_ACCEPT;
}
-static int dccp_print_tuple(struct seq_file *s,
- const struct nf_conntrack_tuple *tuple)
+static void dccp_print_tuple(struct seq_file *s,
+ const struct nf_conntrack_tuple *tuple)
{
- return seq_printf(s, "sport=%hu dport=%hu ",
- ntohs(tuple->src.u.dccp.port),
- ntohs(tuple->dst.u.dccp.port));
+ seq_printf(s, "sport=%hu dport=%hu ",
+ ntohs(tuple->src.u.dccp.port),
+ ntohs(tuple->dst.u.dccp.port));
}
static void dccp_print_conntrack(struct seq_file *s, struct nf_conn *ct)
diff --git a/net/netfilter/nf_conntrack_proto_generic.c b/net/netfilter/nf_conntrack_proto_generic.c
index 957c1db66652..60865f110309 100644
--- a/net/netfilter/nf_conntrack_proto_generic.c
+++ b/net/netfilter/nf_conntrack_proto_generic.c
@@ -63,10 +63,9 @@ static bool generic_invert_tuple(struct nf_conntrack_tuple *tuple,
}
/* Print out the per-protocol part of the tuple. */
-static int generic_print_tuple(struct seq_file *s,
- const struct nf_conntrack_tuple *tuple)
+static void generic_print_tuple(struct seq_file *s,
+ const struct nf_conntrack_tuple *tuple)
{
- return 0;
}
static unsigned int *generic_get_timeouts(struct net *net)
diff --git a/net/netfilter/nf_conntrack_proto_gre.c b/net/netfilter/nf_conntrack_proto_gre.c
index cba607ada069..7648674f29c3 100644
--- a/net/netfilter/nf_conntrack_proto_gre.c
+++ b/net/netfilter/nf_conntrack_proto_gre.c
@@ -226,12 +226,12 @@ static bool gre_pkt_to_tuple(const struct sk_buff *skb, unsigned int dataoff,
}
/* print gre part of tuple */
-static int gre_print_tuple(struct seq_file *s,
- const struct nf_conntrack_tuple *tuple)
+static void gre_print_tuple(struct seq_file *s,
+ const struct nf_conntrack_tuple *tuple)
{
- return seq_printf(s, "srckey=0x%x dstkey=0x%x ",
- ntohs(tuple->src.u.gre.key),
- ntohs(tuple->dst.u.gre.key));
+ seq_printf(s, "srckey=0x%x dstkey=0x%x ",
+ ntohs(tuple->src.u.gre.key),
+ ntohs(tuple->dst.u.gre.key));
}
/* print private data for conntrack */
diff --git a/net/netfilter/nf_conntrack_proto_sctp.c b/net/netfilter/nf_conntrack_proto_sctp.c
index c61f4cd6407d..b45da90fad32 100644
--- a/net/netfilter/nf_conntrack_proto_sctp.c
+++ b/net/netfilter/nf_conntrack_proto_sctp.c
@@ -166,12 +166,12 @@ static bool sctp_invert_tuple(struct nf_conntrack_tuple *tuple,
}
/* Print out the per-protocol part of the tuple. */
-static int sctp_print_tuple(struct seq_file *s,
- const struct nf_conntrack_tuple *tuple)
+static void sctp_print_tuple(struct seq_file *s,
+ const struct nf_conntrack_tuple *tuple)
{
- return seq_printf(s, "sport=%hu dport=%hu ",
- ntohs(tuple->src.u.sctp.port),
- ntohs(tuple->dst.u.sctp.port));
+ seq_printf(s, "sport=%hu dport=%hu ",
+ ntohs(tuple->src.u.sctp.port),
+ ntohs(tuple->dst.u.sctp.port));
}
/* Print out the private part of the conntrack. */
diff --git a/net/netfilter/nf_conntrack_proto_tcp.c b/net/netfilter/nf_conntrack_proto_tcp.c
index 79668fd3db96..36a3ac8ee9f5 100644
--- a/net/netfilter/nf_conntrack_proto_tcp.c
+++ b/net/netfilter/nf_conntrack_proto_tcp.c
@@ -302,12 +302,12 @@ static bool tcp_invert_tuple(struct nf_conntrack_tuple *tuple,
}
/* Print out the per-protocol part of the tuple. */
-static int tcp_print_tuple(struct seq_file *s,
- const struct nf_conntrack_tuple *tuple)
+static void tcp_print_tuple(struct seq_file *s,
+ const struct nf_conntrack_tuple *tuple)
{
- return seq_printf(s, "sport=%hu dport=%hu ",
- ntohs(tuple->src.u.tcp.port),
- ntohs(tuple->dst.u.tcp.port));
+ seq_printf(s, "sport=%hu dport=%hu ",
+ ntohs(tuple->src.u.tcp.port),
+ ntohs(tuple->dst.u.tcp.port));
}
/* Print out the private part of the conntrack. */
diff --git a/net/netfilter/nf_conntrack_proto_udp.c b/net/netfilter/nf_conntrack_proto_udp.c
index 9d7721cbce4b..6957281ffee5 100644
--- a/net/netfilter/nf_conntrack_proto_udp.c
+++ b/net/netfilter/nf_conntrack_proto_udp.c
@@ -63,12 +63,12 @@ static bool udp_invert_tuple(struct nf_conntrack_tuple *tuple,
}
/* Print out the per-protocol part of the tuple. */
-static int udp_print_tuple(struct seq_file *s,
- const struct nf_conntrack_tuple *tuple)
+static void udp_print_tuple(struct seq_file *s,
+ const struct nf_conntrack_tuple *tuple)
{
- return seq_printf(s, "sport=%hu dport=%hu ",
- ntohs(tuple->src.u.udp.port),
- ntohs(tuple->dst.u.udp.port));
+ seq_printf(s, "sport=%hu dport=%hu ",
+ ntohs(tuple->src.u.udp.port),
+ ntohs(tuple->dst.u.udp.port));
}
static unsigned int *udp_get_timeouts(struct net *net)
diff --git a/net/netfilter/nf_conntrack_proto_udplite.c b/net/netfilter/nf_conntrack_proto_udplite.c
index 2750e6c69f82..c5903d1649f9 100644
--- a/net/netfilter/nf_conntrack_proto_udplite.c
+++ b/net/netfilter/nf_conntrack_proto_udplite.c
@@ -71,12 +71,12 @@ static bool udplite_invert_tuple(struct nf_conntrack_tuple *tuple,
}
/* Print out the per-protocol part of the tuple. */
-static int udplite_print_tuple(struct seq_file *s,
- const struct nf_conntrack_tuple *tuple)
+static void udplite_print_tuple(struct seq_file *s,
+ const struct nf_conntrack_tuple *tuple)
{
- return seq_printf(s, "sport=%hu dport=%hu ",
- ntohs(tuple->src.u.udp.port),
- ntohs(tuple->dst.u.udp.port));
+ seq_printf(s, "sport=%hu dport=%hu ",
+ ntohs(tuple->src.u.udp.port),
+ ntohs(tuple->dst.u.udp.port));
}
static unsigned int *udplite_get_timeouts(struct net *net)
diff --git a/net/netfilter/nf_conntrack_standalone.c b/net/netfilter/nf_conntrack_standalone.c
index 348aa3602787..23a0dcab21d4 100644
--- a/net/netfilter/nf_conntrack_standalone.c
+++ b/net/netfilter/nf_conntrack_standalone.c
@@ -36,12 +36,13 @@
MODULE_LICENSE("GPL");
#ifdef CONFIG_NF_CONNTRACK_PROCFS
-int
+void
print_tuple(struct seq_file *s, const struct nf_conntrack_tuple *tuple,
const struct nf_conntrack_l3proto *l3proto,
const struct nf_conntrack_l4proto *l4proto)
{
- return l3proto->print_tuple(s, tuple) || l4proto->print_tuple(s, tuple);
+ l3proto->print_tuple(s, tuple);
+ l4proto->print_tuple(s, tuple);
}
EXPORT_SYMBOL_GPL(print_tuple);
@@ -202,9 +203,8 @@ static int ct_seq_show(struct seq_file *s, void *v)
if (l4proto->print_conntrack)
l4proto->print_conntrack(s, ct);
- if (print_tuple(s, &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
- l3proto, l4proto))
- goto release;
+ print_tuple(s, &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
+ l3proto, l4proto);
if (seq_print_acct(s, ct, IP_CT_DIR_ORIGINAL))
goto release;
@@ -213,9 +213,8 @@ static int ct_seq_show(struct seq_file *s, void *v)
if (seq_printf(s, "[UNREPLIED] "))
goto release;
- if (print_tuple(s, &ct->tuplehash[IP_CT_DIR_REPLY].tuple,
- l3proto, l4proto))
- goto release;
+ print_tuple(s, &ct->tuplehash[IP_CT_DIR_REPLY].tuple,
+ l3proto, l4proto);
if (seq_print_acct(s, ct, IP_CT_DIR_REPLY))
goto release;
From e71456ae9871f53868befd08b1d192ca93ce0753 Mon Sep 17 00:00:00 2001
From: "Steven Rostedt (Red Hat)" <rostedt@goodmis.org>
Date: Mon, 27 Oct 2014 17:43:45 -0400
Subject: [PATCH 4/8] netfilter: Remove checks of seq_printf() return values
The return value of seq_printf() is soon to be removed. Remove the
checks from seq_printf() in favor of seq_has_overflowed().
Link: http://lkml.kernel.org/r/20141104142236.GA10239@salvia
Acked-by: Pablo Neira Ayuso <pablo@netfilter.org>
Cc: Patrick McHardy <kaber@trash.net>
Cc: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
Cc: netfilter-devel@vger.kernel.org
Cc: coreteam@netfilter.org
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
---
.../nf_conntrack_l3proto_ipv4_compat.c | 36 +++++------
net/netfilter/nf_conntrack_standalone.c | 60 +++++++++----------
net/netfilter/nf_log.c | 30 +++++-----
net/netfilter/nfnetlink_queue_core.c | 13 ++--
net/netfilter/x_tables.c | 19 +++---
net/netfilter/xt_hashlimit.c | 36 ++++++-----
6 files changed, 97 insertions(+), 97 deletions(-)
diff --git a/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4_compat.c b/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4_compat.c
index d927f9e72130..a460a87e14f8 100644
--- a/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4_compat.c
+++ b/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4_compat.c
@@ -94,7 +94,7 @@ static void ct_seq_stop(struct seq_file *s, void *v)
}
#ifdef CONFIG_NF_CONNTRACK_SECMARK
-static int ct_show_secctx(struct seq_file *s, const struct nf_conn *ct)
+static void ct_show_secctx(struct seq_file *s, const struct nf_conn *ct)
{
int ret;
u32 len;
@@ -102,17 +102,15 @@ static int ct_show_secctx(struct seq_file *s, const struct nf_conn *ct)
ret = security_secid_to_secctx(ct->secmark, &secctx, &len);
if (ret)
- return 0;
+ return;
- ret = seq_printf(s, "secctx=%s ", secctx);
+ seq_printf(s, "secctx=%s ", secctx);
security_release_secctx(secctx, len);
- return ret;
}
#else
-static inline int ct_show_secctx(struct seq_file *s, const struct nf_conn *ct)
+static inline void ct_show_secctx(struct seq_file *s, const struct nf_conn *ct)
{
- return 0;
}
#endif
@@ -141,11 +139,10 @@ static int ct_seq_show(struct seq_file *s, void *v)
NF_CT_ASSERT(l4proto);
ret = -ENOSPC;
- if (seq_printf(s, "%-8s %u %ld ",
- l4proto->name, nf_ct_protonum(ct),
- timer_pending(&ct->timeout)
- ? (long)(ct->timeout.expires - jiffies)/HZ : 0) != 0)
- goto release;
+ seq_printf(s, "%-8s %u %ld ",
+ l4proto->name, nf_ct_protonum(ct),
+ timer_pending(&ct->timeout)
+ ? (long)(ct->timeout.expires - jiffies)/HZ : 0);
if (l4proto->print_conntrack)
l4proto->print_conntrack(s, ct);
@@ -163,8 +160,7 @@ static int ct_seq_show(struct seq_file *s, void *v)
goto release;
if (!(test_bit(IPS_SEEN_REPLY_BIT, &ct->status)))
- if (seq_printf(s, "[UNREPLIED] "))
- goto release;
+ seq_printf(s, "[UNREPLIED] ");
print_tuple(s, &ct->tuplehash[IP_CT_DIR_REPLY].tuple,
l3proto, l4proto);
@@ -176,19 +172,19 @@ static int ct_seq_show(struct seq_file *s, void *v)
goto release;
if (test_bit(IPS_ASSURED_BIT, &ct->status))
- if (seq_printf(s, "[ASSURED] "))
- goto release;
+ seq_printf(s, "[ASSURED] ");
#ifdef CONFIG_NF_CONNTRACK_MARK
- if (seq_printf(s, "mark=%u ", ct->mark))
- goto release;
+ seq_printf(s, "mark=%u ", ct->mark);
#endif
- if (ct_show_secctx(s, ct))
+ ct_show_secctx(s, ct);
+
+ seq_printf(s, "use=%u\n", atomic_read(&ct->ct_general.use));
+
+ if (seq_has_overflowed(s))
goto release;
- if (seq_printf(s, "use=%u\n", atomic_read(&ct->ct_general.use)))
- goto release;
ret = 0;
release:
nf_ct_put(ct);
diff --git a/net/netfilter/nf_conntrack_standalone.c b/net/netfilter/nf_conntrack_standalone.c
index 23a0dcab21d4..fc823fa5dcf5 100644
--- a/net/netfilter/nf_conntrack_standalone.c
+++ b/net/netfilter/nf_conntrack_standalone.c
@@ -120,7 +120,7 @@ static void ct_seq_stop(struct seq_file *s, void *v)
}
#ifdef CONFIG_NF_CONNTRACK_SECMARK
-static int ct_show_secctx(struct seq_file *s, const struct nf_conn *ct)
+static void ct_show_secctx(struct seq_file *s, const struct nf_conn *ct)
{
int ret;
u32 len;
@@ -128,22 +128,20 @@ static int ct_show_secctx(struct seq_file *s, const struct nf_conn *ct)
ret = security_secid_to_secctx(ct->secmark, &secctx, &len);
if (ret)
- return 0;
+ return;
- ret = seq_printf(s, "secctx=%s ", secctx);
+ seq_printf(s, "secctx=%s ", secctx);
security_release_secctx(secctx, len);
- return ret;
}
#else
-static inline int ct_show_secctx(struct seq_file *s, const struct nf_conn *ct)
+static inline void ct_show_secctx(struct seq_file *s, const struct nf_conn *ct)
{
- return 0;
}
#endif
#ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
-static int ct_show_delta_time(struct seq_file *s, const struct nf_conn *ct)
+static void ct_show_delta_time(struct seq_file *s, const struct nf_conn *ct)
{
struct ct_iter_state *st = s->private;
struct nf_conn_tstamp *tstamp;
@@ -157,16 +155,15 @@ static int ct_show_delta_time(struct seq_file *s, const struct nf_conn *ct)
else
delta_time = 0;
- return seq_printf(s, "delta-time=%llu ",
- (unsigned long long)delta_time);
+ seq_printf(s, "delta-time=%llu ",
+ (unsigned long long)delta_time);
}
- return 0;
+ return;
}
#else
-static inline int
+static inline void
ct_show_delta_time(struct seq_file *s, const struct nf_conn *ct)
{
- return 0;
}
#endif
@@ -193,12 +190,11 @@ static int ct_seq_show(struct seq_file *s, void *v)
NF_CT_ASSERT(l4proto);
ret = -ENOSPC;
- if (seq_printf(s, "%-8s %u %-8s %u %ld ",
- l3proto->name, nf_ct_l3num(ct),
- l4proto->name, nf_ct_protonum(ct),
- timer_pending(&ct->timeout)
- ? (long)(ct->timeout.expires - jiffies)/HZ : 0) != 0)
- goto release;
+ seq_printf(s, "%-8s %u %-8s %u %ld ",
+ l3proto->name, nf_ct_l3num(ct),
+ l4proto->name, nf_ct_protonum(ct),
+ timer_pending(&ct->timeout)
+ ? (long)(ct->timeout.expires - jiffies)/HZ : 0);
if (l4proto->print_conntrack)
l4proto->print_conntrack(s, ct);
@@ -206,12 +202,14 @@ static int ct_seq_show(struct seq_file *s, void *v)
print_tuple(s, &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
l3proto, l4proto);
+ if (seq_has_overflowed(s))
+ goto release;
+
if (seq_print_acct(s, ct, IP_CT_DIR_ORIGINAL))
goto release;
if (!(test_bit(IPS_SEEN_REPLY_BIT, &ct->status)))
- if (seq_printf(s, "[UNREPLIED] "))
- goto release;
+ seq_printf(s, "[UNREPLIED] ");
print_tuple(s, &ct->tuplehash[IP_CT_DIR_REPLY].tuple,
l3proto, l4proto);
@@ -220,26 +218,26 @@ static int ct_seq_show(struct seq_file *s, void *v)
goto release;
if (test_bit(IPS_ASSURED_BIT, &ct->status))
- if (seq_printf(s, "[ASSURED] "))
- goto release;
+ seq_printf(s, "[ASSURED] ");
+
+ if (seq_has_overflowed(s))
+ goto release;
#if defined(CONFIG_NF_CONNTRACK_MARK)
- if (seq_printf(s, "mark=%u ", ct->mark))
- goto release;
+ seq_printf(s, "mark=%u ", ct->mark);
#endif
- if (ct_show_secctx(s, ct))
- goto release;
+ ct_show_secctx(s, ct);
#ifdef CONFIG_NF_CONNTRACK_ZONES
- if (seq_printf(s, "zone=%u ", nf_ct_zone(ct)))
- goto release;
+ seq_printf(s, "zone=%u ", nf_ct_zone(ct));
#endif
- if (ct_show_delta_time(s, ct))
- goto release;
+ ct_show_delta_time(s, ct);
- if (seq_printf(s, "use=%u\n", atomic_read(&ct->ct_general.use)))
+ seq_printf(s, "use=%u\n", atomic_read(&ct->ct_general.use));
+
+ if (seq_has_overflowed(s))
goto release;
ret = 0;
diff --git a/net/netfilter/nf_log.c b/net/netfilter/nf_log.c
index d7197649dba6..6e3b9117db1f 100644
--- a/net/netfilter/nf_log.c
+++ b/net/netfilter/nf_log.c
@@ -294,19 +294,19 @@ static int seq_show(struct seq_file *s, void *v)
{
loff_t *pos = v;
const struct nf_logger *logger;
- int i, ret;
+ int i;
struct net *net = seq_file_net(s);
logger = rcu_dereference_protected(net->nf.nf_loggers[*pos],
lockdep_is_held(&nf_log_mutex));
if (!logger)
- ret = seq_printf(s, "%2lld NONE (", *pos);
+ seq_printf(s, "%2lld NONE (", *pos);
else
- ret = seq_printf(s, "%2lld %s (", *pos, logger->name);
+ seq_printf(s, "%2lld %s (", *pos, logger->name);
- if (ret < 0)
- return ret;
+ if (seq_has_overflowed(s))
+ return -ENOSPC;
for (i = 0; i < NF_LOG_TYPE_MAX; i++) {
if (loggers[*pos][i] == NULL)
@@ -314,17 +314,19 @@ static int seq_show(struct seq_file *s, void *v)
logger = rcu_dereference_protected(loggers[*pos][i],
lockdep_is_held(&nf_log_mutex));
- ret = seq_printf(s, "%s", logger->name);
- if (ret < 0)
- return ret;
- if (i == 0 && loggers[*pos][i + 1] != NULL) {
- ret = seq_printf(s, ",");
- if (ret < 0)
- return ret;
- }
+ seq_printf(s, "%s", logger->name);
+ if (i == 0 && loggers[*pos][i + 1] != NULL)
+ seq_printf(s, ",");
+
+ if (seq_has_overflowed(s))
+ return -ENOSPC;
}
- return seq_printf(s, ")\n");
+ seq_printf(s, ")\n");
+
+ if (seq_has_overflowed(s))
+ return -ENOSPC;
+ return 0;
}
static const struct seq_operations nflog_seq_ops = {
diff --git a/net/netfilter/nfnetlink_queue_core.c b/net/netfilter/nfnetlink_queue_core.c
index a82077d9f59b..f823f1538c4f 100644
--- a/net/netfilter/nfnetlink_queue_core.c
+++ b/net/netfilter/nfnetlink_queue_core.c
@@ -1242,12 +1242,13 @@ static int seq_show(struct seq_file *s, void *v)
{
const struct nfqnl_instance *inst = v;
- return seq_printf(s, "%5d %6d %5d %1d %5d %5d %5d %8d %2d\n",
- inst->queue_num,
- inst->peer_portid, inst->queue_total,
- inst->copy_mode, inst->copy_range,
- inst->queue_dropped, inst->queue_user_dropped,
- inst->id_sequence, 1);
+ seq_printf(s, "%5d %6d %5d %1d %5d %5d %5d %8d %2d\n",
+ inst->queue_num,
+ inst->peer_portid, inst->queue_total,
+ inst->copy_mode, inst->copy_range,
+ inst->queue_dropped, inst->queue_user_dropped,
+ inst->id_sequence, 1);
+ return seq_has_overflowed(s);
}
static const struct seq_operations nfqnl_seq_ops = {
diff --git a/net/netfilter/x_tables.c b/net/netfilter/x_tables.c
index 133eb4772f12..51a459c3c649 100644
--- a/net/netfilter/x_tables.c
+++ b/net/netfilter/x_tables.c
@@ -947,9 +947,10 @@ static int xt_table_seq_show(struct seq_file *seq, void *v)
{
struct xt_table *table = list_entry(v, struct xt_table, list);
- if (strlen(table->name))
- return seq_printf(seq, "%s\n", table->name);
- else
+ if (strlen(table->name)) {
+ seq_printf(seq, "%s\n", table->name);
+ return seq_has_overflowed(seq);
+ } else
return 0;
}
@@ -1086,8 +1087,10 @@ static int xt_match_seq_show(struct seq_file *seq, void *v)
if (trav->curr == trav->head)
return 0;
match = list_entry(trav->curr, struct xt_match, list);
- return (*match->name == '\0') ? 0 :
- seq_printf(seq, "%s\n", match->name);
+ if (*match->name == '\0')
+ return 0;
+ seq_printf(seq, "%s\n", match->name);
+ return seq_has_overflowed(seq);
}
return 0;
}
@@ -1139,8 +1142,10 @@ static int xt_target_seq_show(struct seq_file *seq, void *v)
if (trav->curr == trav->head)
return 0;
target = list_entry(trav->curr, struct xt_target, list);
- return (*target->name == '\0') ? 0 :
- seq_printf(seq, "%s\n", target->name);
+ if (*target->name == '\0')
+ return 0;
+ seq_printf(seq, "%s\n", target->name);
+ return seq_has_overflowed(seq);
}
return 0;
}
diff --git a/net/netfilter/xt_hashlimit.c b/net/netfilter/xt_hashlimit.c
index 05fbc2a0be46..178696852bde 100644
--- a/net/netfilter/xt_hashlimit.c
+++ b/net/netfilter/xt_hashlimit.c
@@ -789,7 +789,6 @@ static void dl_seq_stop(struct seq_file *s, void *v)
static int dl_seq_real_show(struct dsthash_ent *ent, u_int8_t family,
struct seq_file *s)
{
- int res;
const struct xt_hashlimit_htable *ht = s->private;
spin_lock(&ent->lock);
@@ -798,33 +797,32 @@ static int dl_seq_real_show(struct dsthash_ent *ent, u_int8_t family,
switch (family) {
case NFPROTO_IPV4:
- res = seq_printf(s, "%ld %pI4:%u->%pI4:%u %u %u %u\n",
- (long)(ent->expires - jiffies)/HZ,
- &ent->dst.ip.src,
- ntohs(ent->dst.src_port),
- &ent->dst.ip.dst,
- ntohs(ent->dst.dst_port),
- ent->rateinfo.credit, ent->rateinfo.credit_cap,
- ent->rateinfo.cost);
+ seq_printf(s, "%ld %pI4:%u->%pI4:%u %u %u %u\n",
+ (long)(ent->expires - jiffies)/HZ,
+ &ent->dst.ip.src,
+ ntohs(ent->dst.src_port),
+ &ent->dst.ip.dst,
+ ntohs(ent->dst.dst_port),
+ ent->rateinfo.credit, ent->rateinfo.credit_cap,
+ ent->rateinfo.cost);
break;
#if IS_ENABLED(CONFIG_IP6_NF_IPTABLES)
case NFPROTO_IPV6:
- res = seq_printf(s, "%ld %pI6:%u->%pI6:%u %u %u %u\n",
- (long)(ent->expires - jiffies)/HZ,
- &ent->dst.ip6.src,
- ntohs(ent->dst.src_port),
- &ent->dst.ip6.dst,
- ntohs(ent->dst.dst_port),
- ent->rateinfo.credit, ent->rateinfo.credit_cap,
- ent->rateinfo.cost);
+ seq_printf(s, "%ld %pI6:%u->%pI6:%u %u %u %u\n",
+ (long)(ent->expires - jiffies)/HZ,
+ &ent->dst.ip6.src,
+ ntohs(ent->dst.src_port),
+ &ent->dst.ip6.dst,
+ ntohs(ent->dst.dst_port),
+ ent->rateinfo.credit, ent->rateinfo.credit_cap,
+ ent->rateinfo.cost);
break;
#endif
default:
BUG();
- res = 0;
}
spin_unlock(&ent->lock);
- return res;
+ return seq_has_overflowed(s);
}
static int dl_seq_show(struct seq_file *s, void *v)
From d6d906b234afc984e93044c19e7b6598824412aa Mon Sep 17 00:00:00 2001
From: Joe Perches <joe@perches.com>
Date: Mon, 29 Sep 2014 16:08:23 -0700
Subject: [PATCH 5/8] dlm: Remove seq_printf() return checks and use
seq_has_overflowed()
The seq_printf() return is going away soon and users of it should
check seq_has_overflowed() to see if the buffer is full and will
not accept any more data.
Convert functions returning int to void where seq_printf() is used.
Link: http://lkml.kernel.org/p/43590057bcb83846acbbcc1fe641f792b2fb7773.1412031505.git.joe@perches.com
Link: http://lkml.kernel.org/r/20141029220107.939492048@goodmis.org
Acked-by: David Teigland <teigland@redhat.com>
Cc: Christine Caulfield <ccaulfie@redhat.com>
Cc: cluster-devel@redhat.com
Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
---
fs/dlm/debug_fs.c | 251 +++++++++++++++++++++-------------------------
1 file changed, 117 insertions(+), 134 deletions(-)
diff --git a/fs/dlm/debug_fs.c b/fs/dlm/debug_fs.c
index 1323c568e362..3bf460894088 100644
--- a/fs/dlm/debug_fs.c
+++ b/fs/dlm/debug_fs.c
@@ -48,8 +48,8 @@ static char *print_lockmode(int mode)
}
}
-static int print_format1_lock(struct seq_file *s, struct dlm_lkb *lkb,
- struct dlm_rsb *res)
+static void print_format1_lock(struct seq_file *s, struct dlm_lkb *lkb,
+ struct dlm_rsb *res)
{
seq_printf(s, "%08x %s", lkb->lkb_id, print_lockmode(lkb->lkb_grmode));
@@ -68,21 +68,17 @@ static int print_format1_lock(struct seq_file *s, struct dlm_lkb *lkb,
if (lkb->lkb_wait_type)
seq_printf(s, " wait_type: %d", lkb->lkb_wait_type);
- return seq_puts(s, "\n");
+ seq_puts(s, "\n");
}
-static int print_format1(struct dlm_rsb *res, struct seq_file *s)
+static void print_format1(struct dlm_rsb *res, struct seq_file *s)
{
struct dlm_lkb *lkb;
int i, lvblen = res->res_ls->ls_lvblen, recover_list, root_list;
- int rv;
lock_rsb(res);
- rv = seq_printf(s, "\nResource %p Name (len=%d) \"",
- res, res->res_length);
- if (rv)
- goto out;
+ seq_printf(s, "\nResource %p Name (len=%d) \"", res, res->res_length);
for (i = 0; i < res->res_length; i++) {
if (isprint(res->res_name[i]))
@@ -92,17 +88,16 @@ static int print_format1(struct dlm_rsb *res, struct seq_file *s)
}
if (res->res_nodeid > 0)
- rv = seq_printf(s, "\"\nLocal Copy, Master is node %d\n",
- res->res_nodeid);
+ seq_printf(s, "\"\nLocal Copy, Master is node %d\n",
+ res->res_nodeid);
else if (res->res_nodeid == 0)
- rv = seq_puts(s, "\"\nMaster Copy\n");
+ seq_puts(s, "\"\nMaster Copy\n");
else if (res->res_nodeid == -1)
- rv = seq_printf(s, "\"\nLooking up master (lkid %x)\n",
- res->res_first_lkid);
+ seq_printf(s, "\"\nLooking up master (lkid %x)\n",
+ res->res_first_lkid);
else
- rv = seq_printf(s, "\"\nInvalid master %d\n",
- res->res_nodeid);
- if (rv)
+ seq_printf(s, "\"\nInvalid master %d\n", res->res_nodeid);
+ if (seq_has_overflowed(s))
goto out;
/* Print the LVB: */
@@ -116,8 +111,8 @@ static int print_format1(struct dlm_rsb *res, struct seq_file *s)
}
if (rsb_flag(res, RSB_VALNOTVALID))
seq_puts(s, " (INVALID)");
- rv = seq_puts(s, "\n");
- if (rv)
+ seq_puts(s, "\n");
+ if (seq_has_overflowed(s))
goto out;
}
@@ -125,32 +120,30 @@ static int print_format1(struct dlm_rsb *res, struct seq_file *s)
recover_list = !list_empty(&res->res_recover_list);
if (root_list || recover_list) {
- rv = seq_printf(s, "Recovery: root %d recover %d flags %lx "
- "count %d\n", root_list, recover_list,
- res->res_flags, res->res_recover_locks_count);
- if (rv)
- goto out;
+ seq_printf(s, "Recovery: root %d recover %d flags %lx count %d\n",
+ root_list, recover_list,
+ res->res_flags, res->res_recover_locks_count);
}
/* Print the locks attached to this resource */
seq_puts(s, "Granted Queue\n");
list_for_each_entry(lkb, &res->res_grantqueue, lkb_statequeue) {
- rv = print_format1_lock(s, lkb, res);
- if (rv)
+ print_format1_lock(s, lkb, res);
+ if (seq_has_overflowed(s))
goto out;
}
seq_puts(s, "Conversion Queue\n");
list_for_each_entry(lkb, &res->res_convertqueue, lkb_statequeue) {
- rv = print_format1_lock(s, lkb, res);
- if (rv)
+ print_format1_lock(s, lkb, res);
+ if (seq_has_overflowed(s))
goto out;
}
seq_puts(s, "Waiting Queue\n");
list_for_each_entry(lkb, &res->res_waitqueue, lkb_statequeue) {
- rv = print_format1_lock(s, lkb, res);
- if (rv)
+ print_format1_lock(s, lkb, res);
+ if (seq_has_overflowed(s))
goto out;
}
@@ -159,23 +152,23 @@ static int print_format1(struct dlm_rsb *res, struct seq_file *s)
seq_puts(s, "Lookup Queue\n");
list_for_each_entry(lkb, &res->res_lookup, lkb_rsb_lookup) {
- rv = seq_printf(s, "%08x %s", lkb->lkb_id,
- print_lockmode(lkb->lkb_rqmode));
+ seq_printf(s, "%08x %s",
+ lkb->lkb_id, print_lockmode(lkb->lkb_rqmode));
if (lkb->lkb_wait_type)
seq_printf(s, " wait_type: %d", lkb->lkb_wait_type);
- rv = seq_puts(s, "\n");
+ seq_puts(s, "\n");
+ if (seq_has_overflowed(s))
+ goto out;
}
out:
unlock_rsb(res);
- return rv;
}
-static int print_format2_lock(struct seq_file *s, struct dlm_lkb *lkb,
- struct dlm_rsb *r)
+static void print_format2_lock(struct seq_file *s, struct dlm_lkb *lkb,
+ struct dlm_rsb *r)
{
u64 xid = 0;
u64 us;
- int rv;
if (lkb->lkb_flags & DLM_IFL_USER) {
if (lkb->lkb_ua)
@@ -188,103 +181,97 @@ static int print_format2_lock(struct seq_file *s, struct dlm_lkb *lkb,
/* id nodeid remid pid xid exflags flags sts grmode rqmode time_us
r_nodeid r_len r_name */
- rv = seq_printf(s, "%x %d %x %u %llu %x %x %d %d %d %llu %u %d \"%s\"\n",
- lkb->lkb_id,
- lkb->lkb_nodeid,
- lkb->lkb_remid,
- lkb->lkb_ownpid,
- (unsigned long long)xid,
- lkb->lkb_exflags,
- lkb->lkb_flags,
- lkb->lkb_status,
- lkb->lkb_grmode,
- lkb->lkb_rqmode,
- (unsigned long long)us,
- r->res_nodeid,
- r->res_length,
- r->res_name);
- return rv;
+ seq_printf(s, "%x %d %x %u %llu %x %x %d %d %d %llu %u %d \"%s\"\n",
+ lkb->lkb_id,
+ lkb->lkb_nodeid,
+ lkb->lkb_remid,
+ lkb->lkb_ownpid,
+ (unsigned long long)xid,
+ lkb->lkb_exflags,
+ lkb->lkb_flags,
+ lkb->lkb_status,
+ lkb->lkb_grmode,
+ lkb->lkb_rqmode,
+ (unsigned long long)us,
+ r->res_nodeid,
+ r->res_length,
+ r->res_name);
}
-static int print_format2(struct dlm_rsb *r, struct seq_file *s)
+static void print_format2(struct dlm_rsb *r, struct seq_file *s)
{
struct dlm_lkb *lkb;
- int rv = 0;
lock_rsb(r);
list_for_each_entry(lkb, &r->res_grantqueue, lkb_statequeue) {
- rv = print_format2_lock(s, lkb, r);
- if (rv)
+ print_format2_lock(s, lkb, r);
+ if (seq_has_overflowed(s))
goto out;
}
list_for_each_entry(lkb, &r->res_convertqueue, lkb_statequeue) {
- rv = print_format2_lock(s, lkb, r);
- if (rv)
+ print_format2_lock(s, lkb, r);
+ if (seq_has_overflowed(s))
goto out;
}
list_for_each_entry(lkb, &r->res_waitqueue, lkb_statequeue) {
- rv = print_format2_lock(s, lkb, r);
- if (rv)
+ print_format2_lock(s, lkb, r);
+ if (seq_has_overflowed(s))
goto out;
}
out:
unlock_rsb(r);
- return rv;
}
-static int print_format3_lock(struct seq_file *s, struct dlm_lkb *lkb,
+static void print_format3_lock(struct seq_file *s, struct dlm_lkb *lkb,
int rsb_lookup)
{
u64 xid = 0;
- int rv;
if (lkb->lkb_flags & DLM_IFL_USER) {
if (lkb->lkb_ua)
xid = lkb->lkb_ua->xid;
}
- rv = seq_printf(s, "lkb %x %d %x %u %llu %x %x %d %d %d %d %d %d %u %llu %llu\n",
- lkb->lkb_id,
- lkb->lkb_nodeid,
- lkb->lkb_remid,
- lkb->lkb_ownpid,
- (unsigned long long)xid,
- lkb->lkb_exflags,
- lkb->lkb_flags,
- lkb->lkb_status,
- lkb->lkb_grmode,
- lkb->lkb_rqmode,
- lkb->lkb_last_bast.mode,
- rsb_lookup,
- lkb->lkb_wait_type,
- lkb->lkb_lvbseq,
- (unsigned long long)ktime_to_ns(lkb->lkb_timestamp),
- (unsigned long long)ktime_to_ns(lkb->lkb_last_bast_time));
- return rv;
+ seq_printf(s, "lkb %x %d %x %u %llu %x %x %d %d %d %d %d %d %u %llu %llu\n",
+ lkb->lkb_id,
+ lkb->lkb_nodeid,
+ lkb->lkb_remid,
+ lkb->lkb_ownpid,
+ (unsigned long long)xid,
+ lkb->lkb_exflags,
+ lkb->lkb_flags,
+ lkb->lkb_status,
+ lkb->lkb_grmode,
+ lkb->lkb_rqmode,
+ lkb->lkb_last_bast.mode,
+ rsb_lookup,
+ lkb->lkb_wait_type,
+ lkb->lkb_lvbseq,
+ (unsigned long long)ktime_to_ns(lkb->lkb_timestamp),
+ (unsigned long long)ktime_to_ns(lkb->lkb_last_bast_time));
}
-static int print_format3(struct dlm_rsb *r, struct seq_file *s)
+static void print_format3(struct dlm_rsb *r, struct seq_file *s)
{
struct dlm_lkb *lkb;
int i, lvblen = r->res_ls->ls_lvblen;
int print_name = 1;
- int rv;
lock_rsb(r);
- rv = seq_printf(s, "rsb %p %d %x %lx %d %d %u %d ",
- r,
- r->res_nodeid,
- r->res_first_lkid,
- r->res_flags,
- !list_empty(&r->res_root_list),
- !list_empty(&r->res_recover_list),
- r->res_recover_locks_count,
- r->res_length);
- if (rv)
+ seq_printf(s, "rsb %p %d %x %lx %d %d %u %d ",
+ r,
+ r->res_nodeid,
+ r->res_first_lkid,
+ r->res_flags,
+ !list_empty(&r->res_root_list),
+ !list_empty(&r->res_recover_list),
+ r->res_recover_locks_count,
+ r->res_length);
+ if (seq_has_overflowed(s))
goto out;
for (i = 0; i < r->res_length; i++) {
@@ -300,8 +287,8 @@ static int print_format3(struct dlm_rsb *r, struct seq_file *s)
else
seq_printf(s, " %02x", (unsigned char)r->res_name[i]);
}
- rv = seq_puts(s, "\n");
- if (rv)
+ seq_puts(s, "\n");
+ if (seq_has_overflowed(s))
goto out;
if (!r->res_lvbptr)
@@ -311,58 +298,55 @@ static int print_format3(struct dlm_rsb *r, struct seq_file *s)
for (i = 0; i < lvblen; i++)
seq_printf(s, " %02x", (unsigned char)r->res_lvbptr[i]);
- rv = seq_puts(s, "\n");
- if (rv)
+ seq_puts(s, "\n");
+ if (seq_has_overflowed(s))
goto out;
do_locks:
list_for_each_entry(lkb, &r->res_grantqueue, lkb_statequeue) {
- rv = print_format3_lock(s, lkb, 0);
- if (rv)
+ print_format3_lock(s, lkb, 0);
+ if (seq_has_overflowed(s))
goto out;
}
list_for_each_entry(lkb, &r->res_convertqueue, lkb_statequeue) {
- rv = print_format3_lock(s, lkb, 0);
- if (rv)
+ print_format3_lock(s, lkb, 0);
+ if (seq_has_overflowed(s))
goto out;
}
list_for_each_entry(lkb, &r->res_waitqueue, lkb_statequeue) {
- rv = print_format3_lock(s, lkb, 0);
- if (rv)
+ print_format3_lock(s, lkb, 0);
+ if (seq_has_overflowed(s))
goto out;
}
list_for_each_entry(lkb, &r->res_lookup, lkb_rsb_lookup) {
- rv = print_format3_lock(s, lkb, 1);
- if (rv)
+ print_format3_lock(s, lkb, 1);
+ if (seq_has_overflowed(s))
goto out;
}
out:
unlock_rsb(r);
- return rv;
}
-static int print_format4(struct dlm_rsb *r, struct seq_file *s)
+static void print_format4(struct dlm_rsb *r, struct seq_file *s)
{
int our_nodeid = dlm_our_nodeid();
int print_name = 1;
- int i, rv;
+ int i;
lock_rsb(r);
- rv = seq_printf(s, "rsb %p %d %d %d %d %lu %lx %d ",
- r,
- r->res_nodeid,
- r->res_master_nodeid,
- r->res_dir_nodeid,
- our_nodeid,
- r->res_toss_time,
- r->res_flags,
- r->res_length);
- if (rv)
- goto out;
+ seq_printf(s, "rsb %p %d %d %d %d %lu %lx %d ",
+ r,
+ r->res_nodeid,
+ r->res_master_nodeid,
+ r->res_dir_nodeid,
+ our_nodeid,
+ r->res_toss_time,
+ r->res_flags,
+ r->res_length);
for (i = 0; i < r->res_length; i++) {
if (!isascii(r->res_name[i]) || !isprint(r->res_name[i]))
@@ -377,10 +361,9 @@ static int print_format4(struct dlm_rsb *r, struct seq_file *s)
else
seq_printf(s, " %02x", (unsigned char)r->res_name[i]);
}
- rv = seq_puts(s, "\n");
- out:
+ seq_puts(s, "\n");
+
unlock_rsb(r);
- return rv;
}
struct rsbtbl_iter {
@@ -390,20 +373,20 @@ struct rsbtbl_iter {
int header;
};
-/* seq_printf returns -1 if the buffer is full, and 0 otherwise.
- If the buffer is full, seq_printf can be called again, but it
- does nothing and just returns -1. So, the these printing routines
- periodically check the return value to avoid wasting too much time
- trying to print to a full buffer. */
+/*
+ * If the buffer is full, seq_printf can be called again, but it
+ * does nothing. So, the these printing routines periodically check
+ * seq_has_overflowed to avoid wasting too much time trying to print to
+ * a full buffer.
+ */
static int table_seq_show(struct seq_file *seq, void *iter_ptr)
{
struct rsbtbl_iter *ri = iter_ptr;
- int rv = 0;
switch (ri->format) {
case 1:
- rv = print_format1(ri->rsb, seq);
+ print_format1(ri->rsb, seq);
break;
case 2:
if (ri->header) {
@@ -412,25 +395,25 @@ static int table_seq_show(struct seq_file *seq, void *iter_ptr)
"r_nodeid r_len r_name\n");
ri->header = 0;
}
- rv = print_format2(ri->rsb, seq);
+ print_format2(ri->rsb, seq);
break;
case 3:
if (ri->header) {
seq_printf(seq, "version rsb 1.1 lvb 1.1 lkb 1.1\n");
ri->header = 0;
}
- rv = print_format3(ri->rsb, seq);
+ print_format3(ri->rsb, seq);
break;
case 4:
if (ri->header) {
seq_printf(seq, "version 4 rsb 2\n");
ri->header = 0;
}
- rv = print_format4(ri->rsb, seq);
+ print_format4(ri->rsb, seq);
break;
}
- return rv;
+ return 0;
}
static const struct seq_operations format1_seq_ops;
From f365ef9b79f01d69a01134b42fdff251a510b022 Mon Sep 17 00:00:00 2001
From: Joe Perches <joe@perches.com>
Date: Mon, 29 Sep 2014 16:08:24 -0700
Subject: [PATCH 6/8] dlm: Use seq_puts() instead of seq_printf() for constant
strings
Convert the seq_printf output with constant strings to seq_puts.
Link: http://lkml.kernel.org/p/b416b016f4a6e49115ba736cad6ea2709a8bc1c4.1412031505.git.joe@perches.com
Cc: Christine Caulfield <ccaulfie@redhat.com>
Cc: David Teigland <teigland@redhat.com>
Cc: cluster-devel@redhat.com
Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
---
fs/dlm/debug_fs.c | 12 +++++-------
1 file changed, 5 insertions(+), 7 deletions(-)
diff --git a/fs/dlm/debug_fs.c b/fs/dlm/debug_fs.c
index 3bf460894088..eea64912c9c0 100644
--- a/fs/dlm/debug_fs.c
+++ b/fs/dlm/debug_fs.c
@@ -279,7 +279,7 @@ static void print_format3(struct dlm_rsb *r, struct seq_file *s)
print_name = 0;
}
- seq_printf(s, "%s", print_name ? "str " : "hex");
+ seq_puts(s, print_name ? "str " : "hex");
for (i = 0; i < r->res_length; i++) {
if (print_name)
@@ -353,7 +353,7 @@ static void print_format4(struct dlm_rsb *r, struct seq_file *s)
print_name = 0;
}
- seq_printf(s, "%s", print_name ? "str " : "hex");
+ seq_puts(s, print_name ? "str " : "hex");
for (i = 0; i < r->res_length; i++) {
if (print_name)
@@ -390,23 +390,21 @@ static int table_seq_show(struct seq_file *seq, void *iter_ptr)
break;
case 2:
if (ri->header) {
- seq_printf(seq, "id nodeid remid pid xid exflags "
- "flags sts grmode rqmode time_ms "
- "r_nodeid r_len r_name\n");
+ seq_puts(seq, "id nodeid remid pid xid exflags flags sts grmode rqmode time_ms r_nodeid r_len r_name\n");
ri->header = 0;
}
print_format2(ri->rsb, seq);
break;
case 3:
if (ri->header) {
- seq_printf(seq, "version rsb 1.1 lvb 1.1 lkb 1.1\n");
+ seq_puts(seq, "version rsb 1.1 lvb 1.1 lkb 1.1\n");
ri->header = 0;
}
print_format3(ri->rsb, seq);
break;
case 4:
if (ri->header) {
- seq_printf(seq, "version 4 rsb 2\n");
+ seq_puts(seq, "version 4 rsb 2\n");
ri->header = 0;
}
print_format4(ri->rsb, seq);
From a3816ab0e8fe542a89a53b82506a8ddac063fbe3 Mon Sep 17 00:00:00 2001
From: Joe Perches <joe@perches.com>
Date: Mon, 29 Sep 2014 16:08:25 -0700
Subject: [PATCH 7/8] fs: Convert show_fdinfo functions to void
seq_printf functions shouldn't really check the return value.
Checking seq_has_overflowed() occasionally is used instead.
Update vfs documentation.
Link: http://lkml.kernel.org/p/e37e6e7b76acbdcc3bb4ab2a57c8f8ca1ae11b9a.1412031505.git.joe@perches.com
Cc: David S. Miller <davem@davemloft.net>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Joe Perches <joe@perches.com>
[ did a few clean ups ]
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
---
Documentation/filesystems/vfs.txt | 2 +-
drivers/net/tun.c | 4 +-
fs/eventfd.c | 9 ++--
fs/eventpoll.c | 13 ++----
fs/notify/fdinfo.c | 78 +++++++++++++------------------
fs/notify/fdinfo.h | 4 +-
fs/proc/fd.c | 3 +-
fs/signalfd.c | 4 +-
fs/timerfd.c | 27 +++++------
include/linux/fs.h | 2 +-
10 files changed, 63 insertions(+), 83 deletions(-)
diff --git a/Documentation/filesystems/vfs.txt b/Documentation/filesystems/vfs.txt
index fceff7c00a3c..af1dbc1823bb 100644
--- a/Documentation/filesystems/vfs.txt
+++ b/Documentation/filesystems/vfs.txt
@@ -828,7 +828,7 @@ struct file_operations {
ssize_t (*splice_read)(struct file *, struct pipe_inode_info *, size_t, unsigned int);
int (*setlease)(struct file *, long arg, struct file_lock **, void **);
long (*fallocate)(struct file *, int mode, loff_t offset, loff_t len);
- int (*show_fdinfo)(struct seq_file *m, struct file *f);
+ void (*show_fdinfo)(struct seq_file *m, struct file *f);
};
Again, all methods are called without any locks being held, unless
diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index 186ce541c657..a3420e091689 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -2209,7 +2209,7 @@ static int tun_chr_close(struct inode *inode, struct file *file)
}
#ifdef CONFIG_PROC_FS
-static int tun_chr_show_fdinfo(struct seq_file *m, struct file *f)
+static void tun_chr_show_fdinfo(struct seq_file *m, struct file *f)
{
struct tun_struct *tun;
struct ifreq ifr;
@@ -2225,7 +2225,7 @@ static int tun_chr_show_fdinfo(struct seq_file *m, struct file *f)
if (tun)
tun_put(tun);
- return seq_printf(m, "iff:\t%s\n", ifr.ifr_name);
+ seq_printf(m, "iff:\t%s\n", ifr.ifr_name);
}
#endif
diff --git a/fs/eventfd.c b/fs/eventfd.c
index d6a88e7812f3..4b0a226024fa 100644
--- a/fs/eventfd.c
+++ b/fs/eventfd.c
@@ -287,17 +287,14 @@ static ssize_t eventfd_write(struct file *file, const char __user *buf, size_t c
}
#ifdef CONFIG_PROC_FS
-static int eventfd_show_fdinfo(struct seq_file *m, struct file *f)
+static void eventfd_show_fdinfo(struct seq_file *m, struct file *f)
{
struct eventfd_ctx *ctx = f->private_data;
- int ret;
spin_lock_irq(&ctx->wqh.lock);
- ret = seq_printf(m, "eventfd-count: %16llx\n",
- (unsigned long long)ctx->count);
+ seq_printf(m, "eventfd-count: %16llx\n",
+ (unsigned long long)ctx->count);
spin_unlock_irq(&ctx->wqh.lock);
-
- return ret;
}
#endif
diff --git a/fs/eventpoll.c b/fs/eventpoll.c
index 7bcfff900f05..d77f94491352 100644
--- a/fs/eventpoll.c
+++ b/fs/eventpoll.c
@@ -870,25 +870,22 @@ static unsigned int ep_eventpoll_poll(struct file *file, poll_table *wait)
}
#ifdef CONFIG_PROC_FS
-static int ep_show_fdinfo(struct seq_file *m, struct file *f)
+static void ep_show_fdinfo(struct seq_file *m, struct file *f)
{
struct eventpoll *ep = f->private_data;
struct rb_node *rbp;
- int ret = 0;
mutex_lock(&ep->mtx);
for (rbp = rb_first(&ep->rbr); rbp; rbp = rb_next(rbp)) {
struct epitem *epi = rb_entry(rbp, struct epitem, rbn);
- ret = seq_printf(m, "tfd: %8d events: %8x data: %16llx\n",
- epi->ffd.fd, epi->event.events,
- (long long)epi->event.data);
- if (ret)
+ seq_printf(m, "tfd: %8d events: %8x data: %16llx\n",
+ epi->ffd.fd, epi->event.events,
+ (long long)epi->event.data);
+ if (seq_has_overflowed(m))
break;
}
mutex_unlock(&ep->mtx);
-
- return ret;
}
#endif
diff --git a/fs/notify/fdinfo.c b/fs/notify/fdinfo.c
index 9d7e2b9659cb..6ffd220eb14d 100644
--- a/fs/notify/fdinfo.c
+++ b/fs/notify/fdinfo.c
@@ -20,25 +20,24 @@
#if defined(CONFIG_INOTIFY_USER) || defined(CONFIG_FANOTIFY)
-static int show_fdinfo(struct seq_file *m, struct file *f,
- int (*show)(struct seq_file *m, struct fsnotify_mark *mark))
+static void show_fdinfo(struct seq_file *m, struct file *f,
+ void (*show)(struct seq_file *m,
+ struct fsnotify_mark *mark))
{
struct fsnotify_group *group = f->private_data;
struct fsnotify_mark *mark;
- int ret = 0;
mutex_lock(&group->mark_mutex);
list_for_each_entry(mark, &group->marks_list, g_list) {
- ret = show(m, mark);
- if (ret)
+ show(m, mark);
+ if (seq_has_overflowed(m))
break;
}
mutex_unlock(&group->mark_mutex);
- return ret;
}
#if defined(CONFIG_EXPORTFS)
-static int show_mark_fhandle(struct seq_file *m, struct inode *inode)
+static void show_mark_fhandle(struct seq_file *m, struct inode *inode)
{
struct {
struct file_handle handle;
@@ -52,71 +51,62 @@ static int show_mark_fhandle(struct seq_file *m, struct inode *inode)
ret = exportfs_encode_inode_fh(inode, (struct fid *)f.handle.f_handle, &size, 0);
if ((ret == FILEID_INVALID) || (ret < 0)) {
WARN_ONCE(1, "Can't encode file handler for inotify: %d\n", ret);
- return 0;
+ return;
}
f.handle.handle_type = ret;
f.handle.handle_bytes = size * sizeof(u32);
- ret = seq_printf(m, "fhandle-bytes:%x fhandle-type:%x f_handle:",
- f.handle.handle_bytes, f.handle.handle_type);
+ seq_printf(m, "fhandle-bytes:%x fhandle-type:%x f_handle:",
+ f.handle.handle_bytes, f.handle.handle_type);
for (i = 0; i < f.handle.handle_bytes; i++)
- ret |= seq_printf(m, "%02x", (int)f.handle.f_handle[i]);
-
- return ret;
+ seq_printf(m, "%02x", (int)f.handle.f_handle[i]);
}
#else
-static int show_mark_fhandle(struct seq_file *m, struct inode *inode)
+static void show_mark_fhandle(struct seq_file *m, struct inode *inode)
{
- return 0;
}
#endif
#ifdef CONFIG_INOTIFY_USER
-static int inotify_fdinfo(struct seq_file *m, struct fsnotify_mark *mark)
+static void inotify_fdinfo(struct seq_file *m, struct fsnotify_mark *mark)
{
struct inotify_inode_mark *inode_mark;
struct inode *inode;
- int ret = 0;
if (!(mark->flags & (FSNOTIFY_MARK_FLAG_ALIVE | FSNOTIFY_MARK_FLAG_INODE)))
- return 0;
+ return;
inode_mark = container_of(mark, struct inotify_inode_mark, fsn_mark);
inode = igrab(mark->i.inode);
if (inode) {
- ret = seq_printf(m, "inotify wd:%x ino:%lx sdev:%x "
- "mask:%x ignored_mask:%x ",
- inode_mark->wd, inode->i_ino,
- inode->i_sb->s_dev,
- mark->mask, mark->ignored_mask);
- ret |= show_mark_fhandle(m, inode);
- ret |= seq_putc(m, '\n');
+ seq_printf(m, "inotify wd:%x ino:%lx sdev:%x mask:%x ignored_mask:%x ",
+ inode_mark->wd, inode->i_ino, inode->i_sb->s_dev,
+ mark->mask, mark->ignored_mask);
+ show_mark_fhandle(m, inode);
+ seq_putc(m, '\n');
iput(inode);
}
-
- return ret;
}
-int inotify_show_fdinfo(struct seq_file *m, struct file *f)
+void inotify_show_fdinfo(struct seq_file *m, struct file *f)
{
- return show_fdinfo(m, f, inotify_fdinfo);
+ show_fdinfo(m, f, inotify_fdinfo);
}
#endif /* CONFIG_INOTIFY_USER */
#ifdef CONFIG_FANOTIFY
-static int fanotify_fdinfo(struct seq_file *m, struct fsnotify_mark *mark)
+static void fanotify_fdinfo(struct seq_file *m, struct fsnotify_mark *mark)
{
unsigned int mflags = 0;
struct inode *inode;
- int ret = 0;
if (!(mark->flags & FSNOTIFY_MARK_FLAG_ALIVE))
- return 0;
+ return;
if (mark->flags & FSNOTIFY_MARK_FLAG_IGNORED_SURV_MODIFY)
mflags |= FAN_MARK_IGNORED_SURV_MODIFY;
@@ -124,26 +114,22 @@ static int fanotify_fdinfo(struct seq_file *m, struct fsnotify_mark *mark)
if (mark->flags & FSNOTIFY_MARK_FLAG_INODE) {
inode = igrab(mark->i.inode);
if (!inode)
- goto out;
- ret = seq_printf(m, "fanotify ino:%lx sdev:%x "
- "mflags:%x mask:%x ignored_mask:%x ",
- inode->i_ino, inode->i_sb->s_dev,
- mflags, mark->mask, mark->ignored_mask);
- ret |= show_mark_fhandle(m, inode);
- ret |= seq_putc(m, '\n');
+ return;
+ seq_printf(m, "fanotify ino:%lx sdev:%x mflags:%x mask:%x ignored_mask:%x ",
+ inode->i_ino, inode->i_sb->s_dev,
+ mflags, mark->mask, mark->ignored_mask);
+ show_mark_fhandle(m, inode);
+ seq_putc(m, '\n');
iput(inode);
} else if (mark->flags & FSNOTIFY_MARK_FLAG_VFSMOUNT) {
struct mount *mnt = real_mount(mark->m.mnt);
- ret = seq_printf(m, "fanotify mnt_id:%x mflags:%x mask:%x "
- "ignored_mask:%x\n", mnt->mnt_id, mflags,
- mark->mask, mark->ignored_mask);
+ seq_printf(m, "fanotify mnt_id:%x mflags:%x mask:%x ignored_mask:%x\n",
+ mnt->mnt_id, mflags, mark->mask, mark->ignored_mask);
}
-out:
- return ret;
}
-int fanotify_show_fdinfo(struct seq_file *m, struct file *f)
+void fanotify_show_fdinfo(struct seq_file *m, struct file *f)
{
struct fsnotify_group *group = f->private_data;
unsigned int flags = 0;
@@ -169,7 +155,7 @@ int fanotify_show_fdinfo(struct seq_file *m, struct file *f)
seq_printf(m, "fanotify flags:%x event-flags:%x\n",
flags, group->fanotify_data.f_flags);
- return show_fdinfo(m, f, fanotify_fdinfo);
+ show_fdinfo(m, f, fanotify_fdinfo);
}
#endif /* CONFIG_FANOTIFY */
diff --git a/fs/notify/fdinfo.h b/fs/notify/fdinfo.h
index 556afda990e9..9664c4904d6b 100644
--- a/fs/notify/fdinfo.h
+++ b/fs/notify/fdinfo.h
@@ -10,11 +10,11 @@ struct file;
#ifdef CONFIG_PROC_FS
#ifdef CONFIG_INOTIFY_USER
-extern int inotify_show_fdinfo(struct seq_file *m, struct file *f);
+void inotify_show_fdinfo(struct seq_file *m, struct file *f);
#endif
#ifdef CONFIG_FANOTIFY
-extern int fanotify_show_fdinfo(struct seq_file *m, struct file *f);
+void fanotify_show_fdinfo(struct seq_file *m, struct file *f);
#endif
#else /* CONFIG_PROC_FS */
diff --git a/fs/proc/fd.c b/fs/proc/fd.c
index e11d7c590bb0..8e5ad83b629a 100644
--- a/fs/proc/fd.c
+++ b/fs/proc/fd.c
@@ -53,7 +53,8 @@ static int seq_show(struct seq_file *m, void *v)
(long long)file->f_pos, f_flags,
real_mount(file->f_path.mnt)->mnt_id);
if (file->f_op->show_fdinfo)
- ret = file->f_op->show_fdinfo(m, file);
+ file->f_op->show_fdinfo(m, file);
+ ret = seq_has_overflowed(m);
fput(file);
}
diff --git a/fs/signalfd.c b/fs/signalfd.c
index 424b7b65321f..7e412ad74836 100644
--- a/fs/signalfd.c
+++ b/fs/signalfd.c
@@ -230,7 +230,7 @@ static ssize_t signalfd_read(struct file *file, char __user *buf, size_t count,
}
#ifdef CONFIG_PROC_FS
-static int signalfd_show_fdinfo(struct seq_file *m, struct file *f)
+static void signalfd_show_fdinfo(struct seq_file *m, struct file *f)
{
struct signalfd_ctx *ctx = f->private_data;
sigset_t sigmask;
@@ -238,8 +238,6 @@ static int signalfd_show_fdinfo(struct seq_file *m, struct file *f)
sigmask = ctx->sigmask;
signotset(&sigmask);
render_sigset_t(m, "sigmask:\t", &sigmask);
-
- return 0;
}
#endif
diff --git a/fs/timerfd.c b/fs/timerfd.c
index b46ffa94372a..b94fa6c3c6eb 100644
--- a/fs/timerfd.c
+++ b/fs/timerfd.c
@@ -288,7 +288,7 @@ static ssize_t timerfd_read(struct file *file, char __user *buf, size_t count,
}
#ifdef CONFIG_PROC_FS
-static int timerfd_show(struct seq_file *m, struct file *file)
+static void timerfd_show(struct seq_file *m, struct file *file)
{
struct timerfd_ctx *ctx = file->private_data;
struct itimerspec t;
@@ -298,18 +298,19 @@ static int timerfd_show(struct seq_file *m, struct file *file)
t.it_interval = ktime_to_timespec(ctx->tintv);
spin_unlock_irq(&ctx->wqh.lock);
- return seq_printf(m,
- "clockid: %d\n"
- "ticks: %llu\n"
- "settime flags: 0%o\n"
- "it_value: (%llu, %llu)\n"
- "it_interval: (%llu, %llu)\n",
- ctx->clockid, (unsigned long long)ctx->ticks,
- ctx->settime_flags,
- (unsigned long long)t.it_value.tv_sec,
- (unsigned long long)t.it_value.tv_nsec,
- (unsigned long long)t.it_interval.tv_sec,
- (unsigned long long)t.it_interval.tv_nsec);
+ seq_printf(m,
+ "clockid: %d\n"
+ "ticks: %llu\n"
+ "settime flags: 0%o\n"
+ "it_value: (%llu, %llu)\n"
+ "it_interval: (%llu, %llu)\n",
+ ctx->clockid,
+ (unsigned long long)ctx->ticks,
+ ctx->settime_flags,
+ (unsigned long long)t.it_value.tv_sec,
+ (unsigned long long)t.it_value.tv_nsec,
+ (unsigned long long)t.it_interval.tv_sec,
+ (unsigned long long)t.it_interval.tv_nsec);
}
#else
#define timerfd_show NULL
diff --git a/include/linux/fs.h b/include/linux/fs.h
index a957d4366c24..01dd9052a142 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1491,7 +1491,7 @@ struct file_operations {
int (*setlease)(struct file *, long, struct file_lock **, void **);
long (*fallocate)(struct file *file, int mode, loff_t offset,
loff_t len);
- int (*show_fdinfo)(struct seq_file *m, struct file *f);
+ void (*show_fdinfo)(struct seq_file *m, struct file *f);
};
struct inode_operations {
From 9761536e1d9e9e1f325fb04d4ad46b15a39eb94a Mon Sep 17 00:00:00 2001
From: Joe Perches <joe@perches.com>
Date: Mon, 29 Sep 2014 16:08:26 -0700
Subject: [PATCH 8/8] debugfs: Have debugfs_print_regs32() return void
The seq_printf() will soon just return void, and seq_has_overflowed()
should be used instead to see if the seq can no longer accept input.
As the return value of debugfs_print_regs32() has no users and
the seq_file descriptor should be checked with seq_has_overflowed()
instead of return values of functions, it is better to just have
debugfs_print_regs32() also return void.
Link: http://lkml.kernel.org/p/2634b19eb1c04a9d31148c1fe6f1f3819be95349.1412031505.git.joe@perches.com
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Joe Perches <joe@perches.com>
[ original change only updated seq_printf() return, added return of
void to debugfs_print_regs32() as well ]
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
---
Documentation/filesystems/debugfs.txt | 2 +-
fs/debugfs/file.c | 15 ++++++++-------
include/linux/debugfs.h | 7 +++----
3 files changed, 12 insertions(+), 12 deletions(-)
diff --git a/Documentation/filesystems/debugfs.txt b/Documentation/filesystems/debugfs.txt
index 3a863f692728..88ab81c79109 100644
--- a/Documentation/filesystems/debugfs.txt
+++ b/Documentation/filesystems/debugfs.txt
@@ -140,7 +140,7 @@ file.
struct dentry *parent,
struct debugfs_regset32 *regset);
- int debugfs_print_regs32(struct seq_file *s, struct debugfs_reg32 *regs,
+ void debugfs_print_regs32(struct seq_file *s, struct debugfs_reg32 *regs,
int nregs, void __iomem *base, char *prefix);
The "base" argument may be 0, but you may want to build the reg32 array
diff --git a/fs/debugfs/file.c b/fs/debugfs/file.c
index 76c08c2beb2f..8e0f2f410189 100644
--- a/fs/debugfs/file.c
+++ b/fs/debugfs/file.c
@@ -692,18 +692,19 @@ EXPORT_SYMBOL_GPL(debugfs_create_u32_array);
* because some peripherals have several blocks of identical registers,
* for example configuration of dma channels
*/
-int debugfs_print_regs32(struct seq_file *s, const struct debugfs_reg32 *regs,
- int nregs, void __iomem *base, char *prefix)
+void debugfs_print_regs32(struct seq_file *s, const struct debugfs_reg32 *regs,
+ int nregs, void __iomem *base, char *prefix)
{
- int i, ret = 0;
+ int i;
for (i = 0; i < nregs; i++, regs++) {
if (prefix)
- ret += seq_printf(s, "%s", prefix);
- ret += seq_printf(s, "%s = 0x%08x\n", regs->name,
- readl(base + regs->offset));
+ seq_printf(s, "%s", prefix);
+ seq_printf(s, "%s = 0x%08x\n", regs->name,
+ readl(base + regs->offset));
+ if (seq_has_overflowed(s))
+ break;
}
- return ret;
}
EXPORT_SYMBOL_GPL(debugfs_print_regs32);
diff --git a/include/linux/debugfs.h b/include/linux/debugfs.h
index 4d0b4d1aa132..d84f8c254a87 100644
--- a/include/linux/debugfs.h
+++ b/include/linux/debugfs.h
@@ -92,8 +92,8 @@ struct dentry *debugfs_create_regset32(const char *name, umode_t mode,
struct dentry *parent,
struct debugfs_regset32 *regset);
-int debugfs_print_regs32(struct seq_file *s, const struct debugfs_reg32 *regs,
- int nregs, void __iomem *base, char *prefix);
+void debugfs_print_regs32(struct seq_file *s, const struct debugfs_reg32 *regs,
+ int nregs, void __iomem *base, char *prefix);
struct dentry *debugfs_create_u32_array(const char *name, umode_t mode,
struct dentry *parent,
@@ -233,10 +233,9 @@ static inline struct dentry *debugfs_create_regset32(const char *name,
return ERR_PTR(-ENODEV);
}
-static inline int debugfs_print_regs32(struct seq_file *s, const struct debugfs_reg32 *regs,
+static inline void debugfs_print_regs32(struct seq_file *s, const struct debugfs_reg32 *regs,
int nregs, void __iomem *base, char *prefix)
{
- return 0;
}
static inline bool debugfs_initialized(void)