From d270190a75e5b859c6d8eed8d4095fbb45f78264 Mon Sep 17 00:00:00 2001 From: Nicholas Bellinger Date: Sun, 9 Oct 2011 01:48:14 -0700 Subject: iscsi-target: Remove SCF_SE_LUN_CMD flag abuses This patch removes a number of SCF_SE_LUN_CMD flag abuses within iscsi-target code to determine when iscsit_release_cmd() or transport_generic_free_cmd() should be called while releasing an individual iscsi_cmd descriptor. In the place of SCF_SE_LUN_CMD checks, this patch converts existing code to use a new iscsit_free_cmd() that inspects iscsi_cmd->iscsi_opcode types to determine which of the above functions should be invoked. It also removes the now unnecessary special case checking in iscsit_release_commands_from_conn(). (hch: Use iscsit_free_cmd instead of open-coded alternative) Reported-by: Christoph Hellwig Cc: Christoph Hellwig Signed-off-by: Nicholas Bellinger --- drivers/target/iscsi/iscsi_target.c | 31 +++------------------------- drivers/target/iscsi/iscsi_target_erl2.c | 35 +++++++------------------------- drivers/target/iscsi/iscsi_target_util.c | 17 ++++++++++++++++ drivers/target/iscsi/iscsi_target_util.h | 1 + 4 files changed, 28 insertions(+), 56 deletions(-) (limited to 'drivers/target/iscsi') diff --git a/drivers/target/iscsi/iscsi_target.c b/drivers/target/iscsi/iscsi_target.c index e4b9ba296dcf..d86e18dc163a 100644 --- a/drivers/target/iscsi/iscsi_target.c +++ b/drivers/target/iscsi/iscsi_target.c @@ -3538,16 +3538,8 @@ get_immediate: spin_lock_bh(&conn->cmd_lock); list_del(&cmd->i_list); spin_unlock_bh(&conn->cmd_lock); - /* - * Determine if a struct se_cmd is assoicated with - * this struct iscsi_cmd. - */ - if (!(cmd->se_cmd.se_cmd_flags & SCF_SE_LUN_CMD) && - !(cmd->tmr_req)) - iscsit_release_cmd(cmd); - else - transport_generic_free_cmd(&cmd->se_cmd, - 1); + + iscsit_free_cmd(cmd); goto get_immediate; case ISTATE_SEND_NOPIN_WANT_RESPONSE: spin_unlock_bh(&cmd->istate_lock); @@ -3947,30 +3939,13 @@ static void iscsit_release_commands_from_conn(struct iscsi_conn *conn) */ spin_lock_bh(&conn->cmd_lock); list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_list) { - if (!(cmd->se_cmd.se_cmd_flags & SCF_SE_LUN_CMD)) { - - list_del(&cmd->i_list); - spin_unlock_bh(&conn->cmd_lock); - iscsit_increment_maxcmdsn(cmd, sess); - /* - * Special cases for active iSCSI TMR, and - * transport_lookup_cmd_lun() failing from - * iscsit_get_lun_for_cmd() in iscsit_handle_scsi_cmd(). - */ - if (cmd->tmr_req) - transport_generic_free_cmd(&cmd->se_cmd, 1); - else - iscsit_release_cmd(cmd); - spin_lock_bh(&conn->cmd_lock); - continue; - } list_del(&cmd->i_list); spin_unlock_bh(&conn->cmd_lock); iscsit_increment_maxcmdsn(cmd, sess); - transport_generic_free_cmd(&cmd->se_cmd, 1); + iscsit_free_cmd(cmd); spin_lock_bh(&conn->cmd_lock); } diff --git a/drivers/target/iscsi/iscsi_target_erl2.c b/drivers/target/iscsi/iscsi_target_erl2.c index c3803b2fdd65..0b8404c30125 100644 --- a/drivers/target/iscsi/iscsi_target_erl2.c +++ b/drivers/target/iscsi/iscsi_target_erl2.c @@ -143,10 +143,7 @@ void iscsit_free_connection_recovery_entires(struct iscsi_session *sess) list_del(&cmd->i_list); cmd->conn = NULL; spin_unlock(&cr->conn_recovery_cmd_lock); - if (!(cmd->se_cmd.se_cmd_flags & SCF_SE_LUN_CMD)) - iscsit_release_cmd(cmd); - else - transport_generic_free_cmd(&cmd->se_cmd, 1); + iscsit_free_cmd(cmd); spin_lock(&cr->conn_recovery_cmd_lock); } spin_unlock(&cr->conn_recovery_cmd_lock); @@ -168,10 +165,7 @@ void iscsit_free_connection_recovery_entires(struct iscsi_session *sess) list_del(&cmd->i_list); cmd->conn = NULL; spin_unlock(&cr->conn_recovery_cmd_lock); - if (!(cmd->se_cmd.se_cmd_flags & SCF_SE_LUN_CMD)) - iscsit_release_cmd(cmd); - else - transport_generic_free_cmd(&cmd->se_cmd, 1); + iscsit_free_cmd(cmd); spin_lock(&cr->conn_recovery_cmd_lock); } spin_unlock(&cr->conn_recovery_cmd_lock); @@ -256,10 +250,7 @@ void iscsit_discard_cr_cmds_by_expstatsn( iscsit_remove_cmd_from_connection_recovery(cmd, sess); spin_unlock(&cr->conn_recovery_cmd_lock); - if (!(cmd->se_cmd.se_cmd_flags & SCF_SE_LUN_CMD)) - iscsit_release_cmd(cmd); - else - transport_generic_free_cmd(&cmd->se_cmd, 1); + iscsit_free_cmd(cmd); spin_lock(&cr->conn_recovery_cmd_lock); } spin_unlock(&cr->conn_recovery_cmd_lock); @@ -313,10 +304,7 @@ int iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(struct iscsi_conn *conn) list_del(&cmd->i_list); spin_unlock_bh(&conn->cmd_lock); - if (!(cmd->se_cmd.se_cmd_flags & SCF_SE_LUN_CMD)) - iscsit_release_cmd(cmd); - else - transport_generic_free_cmd(&cmd->se_cmd, 1); + iscsit_free_cmd(cmd); spin_lock_bh(&conn->cmd_lock); } spin_unlock_bh(&conn->cmd_lock); @@ -369,11 +357,7 @@ int iscsit_prepare_cmds_for_realligance(struct iscsi_conn *conn) list_del(&cmd->i_list); spin_unlock_bh(&conn->cmd_lock); - - if (!(cmd->se_cmd.se_cmd_flags & SCF_SE_LUN_CMD)) - iscsit_release_cmd(cmd); - else - transport_generic_free_cmd(&cmd->se_cmd, 1); + iscsit_free_cmd(cmd); spin_lock_bh(&conn->cmd_lock); continue; } @@ -393,11 +377,7 @@ int iscsit_prepare_cmds_for_realligance(struct iscsi_conn *conn) (cmd->cmd_sn >= conn->sess->exp_cmd_sn)) { list_del(&cmd->i_list); spin_unlock_bh(&conn->cmd_lock); - - if (!(cmd->se_cmd.se_cmd_flags & SCF_SE_LUN_CMD)) - iscsit_release_cmd(cmd); - else - transport_generic_free_cmd(&cmd->se_cmd, 1); + iscsit_free_cmd(cmd); spin_lock_bh(&conn->cmd_lock); continue; } @@ -422,8 +402,7 @@ int iscsit_prepare_cmds_for_realligance(struct iscsi_conn *conn) iscsit_free_all_datain_reqs(cmd); - if (cmd->se_cmd.se_cmd_flags & SCF_SE_LUN_CMD) - transport_wait_for_tasks(&cmd->se_cmd); + transport_wait_for_tasks(&cmd->se_cmd); /* * Add the struct iscsi_cmd to the connection recovery cmd list */ diff --git a/drivers/target/iscsi/iscsi_target_util.c b/drivers/target/iscsi/iscsi_target_util.c index c4be6223b9cc..02348f727bd4 100644 --- a/drivers/target/iscsi/iscsi_target_util.c +++ b/drivers/target/iscsi/iscsi_target_util.c @@ -840,6 +840,23 @@ void iscsit_release_cmd(struct iscsi_cmd *cmd) kmem_cache_free(lio_cmd_cache, cmd); } +void iscsit_free_cmd(struct iscsi_cmd *cmd) +{ + /* + * Determine if a struct se_cmd is assoicated with + * this struct iscsi_cmd. + */ + switch (cmd->iscsi_opcode) { + case ISCSI_OP_SCSI_CMD: + case ISCSI_OP_SCSI_TMFUNC: + transport_generic_free_cmd(&cmd->se_cmd, 1); + break; + default: + iscsit_release_cmd(cmd); + break; + } +} + int iscsit_check_session_usage_count(struct iscsi_session *sess) { spin_lock_bh(&sess->session_usage_lock); diff --git a/drivers/target/iscsi/iscsi_target_util.h b/drivers/target/iscsi/iscsi_target_util.h index 2cd49d607bda..835bf7de0281 100644 --- a/drivers/target/iscsi/iscsi_target_util.h +++ b/drivers/target/iscsi/iscsi_target_util.h @@ -30,6 +30,7 @@ extern struct iscsi_queue_req *iscsit_get_cmd_from_response_queue(struct iscsi_c extern void iscsit_remove_cmd_from_tx_queues(struct iscsi_cmd *, struct iscsi_conn *); extern void iscsit_free_queue_reqs_for_conn(struct iscsi_conn *); extern void iscsit_release_cmd(struct iscsi_cmd *); +extern void iscsit_free_cmd(struct iscsi_cmd *); extern int iscsit_check_session_usage_count(struct iscsi_session *); extern void iscsit_dec_session_usage_count(struct iscsi_session *); extern void iscsit_inc_session_usage_count(struct iscsi_session *); -- cgit v1.2.3