From 1f33c41c03daece85a84b8dcea5733f3efe3e2b0 Mon Sep 17 00:00:00 2001 From: Joe Perches Date: Mon, 29 Sep 2014 16:08:21 -0700 Subject: 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 Signed-off-by: Joe Perches [ Reworked the original patch from Joe ] Signed-off-by: Steven Rostedt --- 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 8ea3e90ace0..b797ed38de4 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_ 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 3857b720cb1..353948ba1c5 100644 --- a/fs/seq_file.c +++ b/fs/seq_file.c @@ -16,17 +16,6 @@ #include #include - -/* - * 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 @@ Fill: 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 52e0097f61f..cf6a9daaaf6 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 -- cgit v1.2.3-70-g09d2 From 37246a583715e2258d7c5cfecbd9fff0f9fa4b5d Mon Sep 17 00:00:00 2001 From: "Steven Rostedt (Red Hat)" Date: Mon, 27 Oct 2014 16:02:47 -0400 Subject: 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 Cc: Patrick McHardy Cc: Jozsef Kadlecsik Cc: netfilter-devel@vger.kernel.org Cc: coreteam@netfilter.org Signed-off-by: Steven Rostedt --- 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 4c8d573830b..82e4ec002a3 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 4c48e434bb1..91f207c2cb6 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 cb372f96f10..15971177470 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 d5665739e3b..cba607ada06 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 1314d33f6bc..c61f4cd6407 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 44d1ea32570..79668fd3db9 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 cf65a1e040d..348aa360278 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)) -- cgit v1.2.3-70-g09d2 From 824f1fbee7bbbd850cdb62d3f95143fad4719e20 Mon Sep 17 00:00:00 2001 From: Joe Perches Date: Mon, 29 Sep 2014 16:08:22 -0700 Subject: 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/_print_tuple functions. Link: http://lkml.kernel.org/p/f2e8cf8df433a197daa62cbaf124c900c708edc7.1412031505.git.joe@perches.com Cc: Pablo Neira Ayuso Cc: Patrick McHardy Cc: Jozsef Kadlecsik Cc: netfilter-devel@vger.kernel.org Cc: coreteam@netfilter.org Signed-off-by: Joe Perches Signed-off-by: Steven Rostedt --- 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 +++--- net/ipv4/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 cc0c1882760..f2f0fa3bb15 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 adc1fa3dd7a..cdc920b4c4c 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 82e4ec002a3..1f7061313d5 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 a054fe08343..5c61328b770 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 91f207c2cb6..d927f9e7213 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 b91b2641add..80d5554b9a8 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 4cbc6b290dd..b68d0e59c1f 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 b3807c5cb88..90388d60648 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 e7eb807fe07..cf9ace70bec 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 15971177470..6dd995c7c72 100644 --- a/net/netfilter/nf_conntrack_proto_dccp.c +++ b/net/netfilter/nf_conntrack_proto_dccp.c @@ -618,12 +618,12 @@ out_invalid: 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 957c1db6665..60865f11030 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 cba607ada06..7648674f29c 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 c61f4cd6407..b45da90fad3 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 79668fd3db9..36a3ac8ee9f 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 9d7721cbce4..6957281ffee 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 2750e6c69f8..c5903d1649f 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 348aa360278..23a0dcab21d 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; -- cgit v1.2.3-70-g09d2 From e71456ae9871f53868befd08b1d192ca93ce0753 Mon Sep 17 00:00:00 2001 From: "Steven Rostedt (Red Hat)" Date: Mon, 27 Oct 2014 17:43:45 -0400 Subject: 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 Cc: Patrick McHardy Cc: Jozsef Kadlecsik Cc: netfilter-devel@vger.kernel.org Cc: coreteam@netfilter.org Signed-off-by: Steven Rostedt --- .../netfilter/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 d927f9e7213..a460a87e14f 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)) - goto release; + ct_show_secctx(s, ct); + + seq_printf(s, "use=%u\n", atomic_read(&ct->ct_general.use)); - if (seq_printf(s, "use=%u\n", atomic_read(&ct->ct_general.use))) + if (seq_has_overflowed(s)) 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 23a0dcab21d..fc823fa5dcf 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 defined(CONFIG_NF_CONNTRACK_MARK) - if (seq_printf(s, "mark=%u ", ct->mark)) + if (seq_has_overflowed(s)) goto release; + +#if defined(CONFIG_NF_CONNTRACK_MARK) + 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); + + seq_printf(s, "use=%u\n", atomic_read(&ct->ct_general.use)); - if (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 d7197649dba..6e3b9117db1 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 a82077d9f59..f823f1538c4 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 133eb4772f1..51a459c3c64 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 05fbc2a0be4..178696852bd 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) -- cgit v1.2.3-70-g09d2 From d6d906b234afc984e93044c19e7b6598824412aa Mon Sep 17 00:00:00 2001 From: Joe Perches Date: Mon, 29 Sep 2014 16:08:23 -0700 Subject: 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 Cc: Christine Caulfield Cc: cluster-devel@redhat.com Signed-off-by: Joe Perches Signed-off-by: Steven Rostedt --- 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 1323c568e36..3bf46089408 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; -- cgit v1.2.3-70-g09d2 From f365ef9b79f01d69a01134b42fdff251a510b022 Mon Sep 17 00:00:00 2001 From: Joe Perches Date: Mon, 29 Sep 2014 16:08:24 -0700 Subject: 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 Cc: David Teigland Cc: cluster-devel@redhat.com Signed-off-by: Joe Perches Signed-off-by: Steven Rostedt --- 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 3bf46089408..eea64912c9c 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); -- cgit v1.2.3-70-g09d2 From a3816ab0e8fe542a89a53b82506a8ddac063fbe3 Mon Sep 17 00:00:00 2001 From: Joe Perches Date: Mon, 29 Sep 2014 16:08:25 -0700 Subject: 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 Cc: Al Viro Signed-off-by: Joe Perches [ did a few clean ups ] Signed-off-by: Steven Rostedt --- 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 fceff7c00a3..af1dbc1823b 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 186ce541c65..a3420e09168 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 d6a88e7812f..4b0a226024f 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 7bcfff900f0..d77f9449135 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 9d7e2b9659c..6ffd220eb14 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 556afda990e..9664c4904d6 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 e11d7c590bb..8e5ad83b629 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 424b7b65321..7e412ad7483 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 b46ffa94372..b94fa6c3c6e 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 a957d4366c2..01dd9052a14 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 { -- cgit v1.2.3-70-g09d2 From 9761536e1d9e9e1f325fb04d4ad46b15a39eb94a Mon Sep 17 00:00:00 2001 From: Joe Perches Date: Mon, 29 Sep 2014 16:08:26 -0700 Subject: 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 Signed-off-by: Joe Perches [ original change only updated seq_printf() return, added return of void to debugfs_print_regs32() as well ] Signed-off-by: Steven Rostedt --- 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 3a863f69272..88ab81c7910 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 76c08c2beb2..8e0f2f41018 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 4d0b4d1aa13..d84f8c254a8 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) -- cgit v1.2.3-70-g09d2