From bbae3f017060e2890104588000d91bcdc6c4ef2d Mon Sep 17 00:00:00 2001 From: Willy Tarreau Date: Wed, 30 Aug 2017 09:59:52 +0200 Subject: [PATCH] MEDIUM: connection: remove useless flag CO_FL_DATA_WR_SH After careful inspection, this flag is set at exactly two places : - once in the health-check receive callback after receipt of a response - once in the stream interface's shutw() code where CF_SHUTW is always set on chn->flags The flag was checked in the checks before deciding to send data, but when it is set, the wake() callback immediately closes the connection so the CO_FL_SOCK_WR_SH flag is also set. The flag was also checked in si_conn_send(), but checking the channel's flag instead is enough and even reveals that one check involving it could never match. So it's time to remove this flag and replace its check with a check of CF_SHUTW in the stream interface. This way each layer is responsible for its shutdown, this will ease insertion of the mux layer. --- contrib/debug/flags.c | 1 - include/proto/connection.h | 2 -- include/types/connection.h | 4 ++-- src/checks.c | 4 ++-- src/stream_interface.c | 5 ++--- 5 files changed, 6 insertions(+), 10 deletions(-) diff --git a/contrib/debug/flags.c b/contrib/debug/flags.c index 7b938a078..0989e3b9c 100644 --- a/contrib/debug/flags.c +++ b/contrib/debug/flags.c @@ -116,7 +116,6 @@ void show_conn_flags(unsigned int f) SHOW_FLAG(f, CO_FL_ERROR); SHOW_FLAG(f, CO_FL_SOCK_WR_SH); SHOW_FLAG(f, CO_FL_SOCK_RD_SH); - SHOW_FLAG(f, CO_FL_DATA_WR_SH); SHOW_FLAG(f, CO_FL_ADDR_TO_SET); SHOW_FLAG(f, CO_FL_ADDR_FROM_SET); SHOW_FLAG(f, CO_FL_WAIT_ROOM); diff --git a/include/proto/connection.h b/include/proto/connection.h index 8c0301c18..9be862b40 100644 --- a/include/proto/connection.h +++ b/include/proto/connection.h @@ -438,7 +438,6 @@ static inline void conn_sock_shutw(struct connection *c) static inline void conn_data_shutw(struct connection *c) { - c->flags |= CO_FL_DATA_WR_SH; __conn_data_stop_send(c); /* clean data-layer shutdown */ @@ -448,7 +447,6 @@ static inline void conn_data_shutw(struct connection *c) static inline void conn_data_shutw_hard(struct connection *c) { - c->flags |= CO_FL_DATA_WR_SH; __conn_data_stop_send(c); /* unclean data-layer shutdown */ diff --git a/include/types/connection.h b/include/types/connection.h index a24b8585c..9724b2ce6 100644 --- a/include/types/connection.h +++ b/include/types/connection.h @@ -97,10 +97,10 @@ enum { /* unused : 0x00004000 */ /* unused : 0x00008000 */ + /* unused : 0x00010000 */ + /* unused : 0x00020000 */ /* flags used to remember what shutdown have been performed/reported */ - /* unused : 0x00010000 */ - CO_FL_DATA_WR_SH = 0x00020000, /* DATA layer asked for shutw */ CO_FL_SOCK_RD_SH = 0x00040000, /* SOCK layer was notified about shutr/read0 */ CO_FL_SOCK_WR_SH = 0x00080000, /* SOCK layer asked for shutw */ diff --git a/src/checks.c b/src/checks.c index db805e8f9..ba783085c 100644 --- a/src/checks.c +++ b/src/checks.c @@ -744,7 +744,7 @@ static void event_srv_chk_w(struct connection *conn) goto out_wakeup; } - if (conn->flags & (CO_FL_SOCK_WR_SH | CO_FL_DATA_WR_SH)) { + if (conn->flags & CO_FL_SOCK_WR_SH) { /* if the output is closed, we can't do anything */ conn->flags |= CO_FL_ERROR; chk_report_conn_err(conn, 0, 0); @@ -2756,7 +2756,7 @@ static void tcpcheck_main(struct connection *conn) check->bi->i = 0; } - if (conn->flags & (CO_FL_SOCK_WR_SH | CO_FL_DATA_WR_SH)) { + if (conn->flags & CO_FL_SOCK_WR_SH) { conn->flags |= CO_FL_ERROR; chk_report_conn_err(conn, 0, 0); goto out_end_tcpcheck; diff --git a/src/stream_interface.c b/src/stream_interface.c index c19c14695..c3e2c5395 100644 --- a/src/stream_interface.c +++ b/src/stream_interface.c @@ -633,7 +633,7 @@ static void si_conn_send(struct connection *conn) /* when we're here, we already know that there is no spliced * data left, and that there are sendable buffered data. */ - if (!(conn->flags & (CO_FL_ERROR | CO_FL_SOCK_WR_SH | CO_FL_DATA_WR_SH | CO_FL_HANDSHAKE))) { + if (!(conn->flags & (CO_FL_ERROR | CO_FL_SOCK_WR_SH | CO_FL_HANDSHAKE)) && !(oc->flags & CF_SHUTW)) { /* check if we want to inform the kernel that we're interested in * sending more data after this call. We want this if : * - we're about to close after this last send and want to merge @@ -648,8 +648,7 @@ static void si_conn_send(struct connection *conn) if ((!(oc->flags & (CF_NEVER_WAIT|CF_SEND_DONTWAIT)) && ((oc->to_forward && oc->to_forward != CHN_INFINITE_FORWARD) || - (oc->flags & CF_EXPECT_MORE))) || - ((oc->flags & (CF_SHUTW|CF_SHUTW_NOW)) == CF_SHUTW_NOW)) + (oc->flags & CF_EXPECT_MORE))) || (oc->flags & CF_SHUTW_NOW)) send_flag |= CO_SFL_MSG_MORE; if (oc->flags & CF_STREAMER) -- 2.47.3