From bf6932f44a7b3fa7e2246a8b18a44670e5eab6c2 Mon Sep 17 00:00:00 2001 From: Al Viro Date: Sat, 21 Jul 2012 08:55:18 +0100 Subject: [PATCH] iscsi-target: Drop bogus struct file usage for iSCSI/SCTP From Al Viro: BTW, speaking of struct file treatment related to sockets - there's this piece of code in iscsi: /* * The SCTP stack needs struct socket->file. */ if ((np->np_network_transport == ISCSI_SCTP_TCP) || (np->np_network_transport == ISCSI_SCTP_UDP)) { if (!new_sock->file) { new_sock->file = kzalloc( sizeof(struct file), GFP_KERNEL); For one thing, as far as I can see it'not true - sctp does *not* depend on socket->file being non-NULL; it does, in one place, check socket->file->f_flags for O_NONBLOCK, but there it treats NULL socket->file as "flag not set". Which is the case here anyway - the fake struct file created in __iscsi_target_login_thread() (and in iscsi_target_setup_login_socket(), with the same excuse) do *not* get that flag set. Moreover, it's a bloody serious violation of a bunch of asserts in VFS; all struct file instances should come from filp_cachep, via get_empty_filp() (or alloc_file(), which is a wrapper for it). FWIW, I'm very tempted to do this and be done with the entire mess: Signed-off-by: Al Viro Cc: Andy Grover Cc: Hannes Reinecke Cc: Christoph Hellwig Cc: stable@vger.kernel.org Signed-off-by: Nicholas Bellinger --- drivers/target/iscsi/iscsi_target.c | 22 ++------- drivers/target/iscsi/iscsi_target_core.h | 2 - drivers/target/iscsi/iscsi_target_login.c | 60 ++--------------------- 3 files changed, 6 insertions(+), 78 deletions(-) diff --git a/drivers/target/iscsi/iscsi_target.c b/drivers/target/iscsi/iscsi_target.c index 5d56ce44a6c5..97c0f78c3c9c 100644 --- a/drivers/target/iscsi/iscsi_target.c +++ b/drivers/target/iscsi/iscsi_target.c @@ -429,19 +429,8 @@ int iscsit_reset_np_thread( int iscsit_del_np_comm(struct iscsi_np *np) { - if (!np->np_socket) - return 0; - - /* - * Some network transports allocate their own struct sock->file, - * see if we need to free any additional allocated resources. - */ - if (np->np_flags & NPF_SCTP_STRUCT_FILE) { - kfree(np->np_socket->file); - np->np_socket->file = NULL; - } - - sock_release(np->np_socket); + if (np->np_socket) + sock_release(np->np_socket); return 0; } @@ -4079,13 +4068,8 @@ int iscsit_close_connection( kfree(conn->conn_ops); conn->conn_ops = NULL; - if (conn->sock) { - if (conn->conn_flags & CONNFLAG_SCTP_STRUCT_FILE) { - kfree(conn->sock->file); - conn->sock->file = NULL; - } + if (conn->sock) sock_release(conn->sock); - } conn->thread_set = NULL; pr_debug("Moving to TARG_CONN_STATE_FREE.\n"); diff --git a/drivers/target/iscsi/iscsi_target_core.h b/drivers/target/iscsi/iscsi_target_core.h index 63a8ed26f119..8a908b28d8b2 100644 --- a/drivers/target/iscsi/iscsi_target_core.h +++ b/drivers/target/iscsi/iscsi_target_core.h @@ -224,7 +224,6 @@ enum iscsi_timer_flags_table { /* Used for struct iscsi_np->np_flags */ enum np_flags_table { NPF_IP_NETWORK = 0x00, - NPF_SCTP_STRUCT_FILE = 0x01 /* Bugfix */ }; /* Used for struct iscsi_np->np_thread_state */ @@ -504,7 +503,6 @@ struct iscsi_conn { u16 local_port; int net_size; u32 auth_id; -#define CONNFLAG_SCTP_STRUCT_FILE 0x01 u32 conn_flags; /* Used for iscsi_tx_login_rsp() */ u32 login_itt; diff --git a/drivers/target/iscsi/iscsi_target_login.c b/drivers/target/iscsi/iscsi_target_login.c index 1434110b052c..0694d9b1bce6 100644 --- a/drivers/target/iscsi/iscsi_target_login.c +++ b/drivers/target/iscsi/iscsi_target_login.c @@ -794,22 +794,6 @@ int iscsi_target_setup_login_socket( return ret; } np->np_socket = sock; - /* - * The SCTP stack needs struct socket->file. - */ - if ((np->np_network_transport == ISCSI_SCTP_TCP) || - (np->np_network_transport == ISCSI_SCTP_UDP)) { - if (!sock->file) { - sock->file = kzalloc(sizeof(struct file), GFP_KERNEL); - if (!sock->file) { - pr_err("Unable to allocate struct" - " file for SCTP\n"); - ret = -ENOMEM; - goto fail; - } - np->np_flags |= NPF_SCTP_STRUCT_FILE; - } - } /* * Setup the np->np_sockaddr from the passed sockaddr setup * in iscsi_target_configfs.c code.. @@ -869,21 +853,15 @@ int iscsi_target_setup_login_socket( fail: np->np_socket = NULL; - if (sock) { - if (np->np_flags & NPF_SCTP_STRUCT_FILE) { - kfree(sock->file); - sock->file = NULL; - } - + if (sock) sock_release(sock); - } return ret; } static int __iscsi_target_login_thread(struct iscsi_np *np) { u8 buffer[ISCSI_HDR_LEN], iscsi_opcode, zero_tsih = 0; - int err, ret = 0, set_sctp_conn_flag, stop; + int err, ret = 0, stop; struct iscsi_conn *conn = NULL; struct iscsi_login *login; struct iscsi_portal_group *tpg = NULL; @@ -894,7 +872,6 @@ static int __iscsi_target_login_thread(struct iscsi_np *np) struct sockaddr_in6 sock_in6; flush_signals(current); - set_sctp_conn_flag = 0; sock = np->np_socket; spin_lock_bh(&np->np_thread_lock); @@ -917,35 +894,12 @@ static int __iscsi_target_login_thread(struct iscsi_np *np) spin_unlock_bh(&np->np_thread_lock); goto out; } - /* - * The SCTP stack needs struct socket->file. - */ - if ((np->np_network_transport == ISCSI_SCTP_TCP) || - (np->np_network_transport == ISCSI_SCTP_UDP)) { - if (!new_sock->file) { - new_sock->file = kzalloc( - sizeof(struct file), GFP_KERNEL); - if (!new_sock->file) { - pr_err("Unable to allocate struct" - " file for SCTP\n"); - sock_release(new_sock); - /* Get another socket */ - return 1; - } - set_sctp_conn_flag = 1; - } - } - iscsi_start_login_thread_timer(np); conn = kzalloc(sizeof(struct iscsi_conn), GFP_KERNEL); if (!conn) { pr_err("Could not allocate memory for" " new connection\n"); - if (set_sctp_conn_flag) { - kfree(new_sock->file); - new_sock->file = NULL; - } sock_release(new_sock); /* Get another socket */ return 1; @@ -955,9 +909,6 @@ static int __iscsi_target_login_thread(struct iscsi_np *np) conn->conn_state = TARG_CONN_STATE_FREE; conn->sock = new_sock; - if (set_sctp_conn_flag) - conn->conn_flags |= CONNFLAG_SCTP_STRUCT_FILE; - pr_debug("Moving to TARG_CONN_STATE_XPT_UP.\n"); conn->conn_state = TARG_CONN_STATE_XPT_UP; @@ -1205,13 +1156,8 @@ old_sess_out: iscsi_release_param_list(conn->param_list); conn->param_list = NULL; } - if (conn->sock) { - if (conn->conn_flags & CONNFLAG_SCTP_STRUCT_FILE) { - kfree(conn->sock->file); - conn->sock->file = NULL; - } + if (conn->sock) sock_release(conn->sock); - } kfree(conn); if (tpg) { -- 2.20.1