b2cb96494d
This patch addresses a bug where RDMA_CM_EVENT_DISCONNECTED may occur
before the connection shutdown has been completed by rx/tx threads,
that causes isert_free_conn() to wait indefinately on ->conn_wait.
This patch allows isert_disconnect_work code to invoke rdma_disconnect
when isert_disconnect_work() process context is started by client
session reset before isert_free_conn() code has been reached.
It also adds isert_conn->conn_mutex protection for ->state within
isert_disconnect_work(), isert_cq_comp_err() and isert_free_conn()
code, along with isert_check_state() for wait_event usage.
(v2: Add explicit iscsit_cause_connection_reinstatement call
during isert_disconnect_work() to force conn reset)
Cc: stable@vger.kernel.org # 3.10+
Cc: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
95 lines
3.8 KiB
C
95 lines
3.8 KiB
C
#include <linux/module.h>
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#include <linux/list.h>
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#include "../../../drivers/target/iscsi/iscsi_target_core.h"
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struct iscsit_transport {
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#define ISCSIT_TRANSPORT_NAME 16
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char name[ISCSIT_TRANSPORT_NAME];
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int transport_type;
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struct module *owner;
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struct list_head t_node;
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int (*iscsit_setup_np)(struct iscsi_np *, struct __kernel_sockaddr_storage *);
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int (*iscsit_accept_np)(struct iscsi_np *, struct iscsi_conn *);
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void (*iscsit_free_np)(struct iscsi_np *);
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void (*iscsit_free_conn)(struct iscsi_conn *);
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struct iscsi_cmd *(*iscsit_alloc_cmd)(struct iscsi_conn *, gfp_t);
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int (*iscsit_get_login_rx)(struct iscsi_conn *, struct iscsi_login *);
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int (*iscsit_put_login_tx)(struct iscsi_conn *, struct iscsi_login *, u32);
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int (*iscsit_immediate_queue)(struct iscsi_conn *, struct iscsi_cmd *, int);
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int (*iscsit_response_queue)(struct iscsi_conn *, struct iscsi_cmd *, int);
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int (*iscsit_get_dataout)(struct iscsi_conn *, struct iscsi_cmd *, bool);
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int (*iscsit_queue_data_in)(struct iscsi_conn *, struct iscsi_cmd *);
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int (*iscsit_queue_status)(struct iscsi_conn *, struct iscsi_cmd *);
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};
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/*
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* From iscsi_target_transport.c
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*/
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extern int iscsit_register_transport(struct iscsit_transport *);
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extern void iscsit_unregister_transport(struct iscsit_transport *);
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extern struct iscsit_transport *iscsit_get_transport(int);
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extern void iscsit_put_transport(struct iscsit_transport *);
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/*
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* From iscsi_target.c
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*/
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extern int iscsit_setup_scsi_cmd(struct iscsi_conn *, struct iscsi_cmd *,
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unsigned char *);
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extern void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *);
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extern int iscsit_process_scsi_cmd(struct iscsi_conn *, struct iscsi_cmd *,
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struct iscsi_scsi_req *);
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extern int iscsit_check_dataout_hdr(struct iscsi_conn *, unsigned char *,
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struct iscsi_cmd **);
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extern int iscsit_check_dataout_payload(struct iscsi_cmd *, struct iscsi_data *,
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bool);
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extern int iscsit_setup_nop_out(struct iscsi_conn *, struct iscsi_cmd *,
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struct iscsi_nopout *);
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extern int iscsit_process_nop_out(struct iscsi_conn *, struct iscsi_cmd *,
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struct iscsi_nopout *);
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extern int iscsit_handle_logout_cmd(struct iscsi_conn *, struct iscsi_cmd *,
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unsigned char *);
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extern int iscsit_handle_task_mgt_cmd(struct iscsi_conn *, struct iscsi_cmd *,
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unsigned char *);
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extern int iscsit_setup_text_cmd(struct iscsi_conn *, struct iscsi_cmd *,
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struct iscsi_text *);
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extern int iscsit_process_text_cmd(struct iscsi_conn *, struct iscsi_cmd *,
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struct iscsi_text *);
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extern void iscsit_build_rsp_pdu(struct iscsi_cmd *, struct iscsi_conn *,
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bool, struct iscsi_scsi_rsp *);
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extern void iscsit_build_nopin_rsp(struct iscsi_cmd *, struct iscsi_conn *,
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struct iscsi_nopin *, bool);
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extern void iscsit_build_task_mgt_rsp(struct iscsi_cmd *, struct iscsi_conn *,
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struct iscsi_tm_rsp *);
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extern int iscsit_build_text_rsp(struct iscsi_cmd *, struct iscsi_conn *,
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struct iscsi_text_rsp *);
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extern void iscsit_build_reject(struct iscsi_cmd *, struct iscsi_conn *,
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struct iscsi_reject *);
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extern int iscsit_build_logout_rsp(struct iscsi_cmd *, struct iscsi_conn *,
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struct iscsi_logout_rsp *);
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extern int iscsit_logout_post_handler(struct iscsi_cmd *, struct iscsi_conn *);
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/*
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* From iscsi_target_device.c
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*/
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extern void iscsit_increment_maxcmdsn(struct iscsi_cmd *, struct iscsi_session *);
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/*
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* From iscsi_target_erl0.c
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*/
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extern void iscsit_cause_connection_reinstatement(struct iscsi_conn *, int);
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/*
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* From iscsi_target_erl1.c
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*/
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extern void iscsit_stop_dataout_timer(struct iscsi_cmd *);
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/*
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* From iscsi_target_tmr.c
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*/
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extern int iscsit_tmr_post_handler(struct iscsi_cmd *, struct iscsi_conn *);
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/*
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* From iscsi_target_util.c
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*/
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extern struct iscsi_cmd *iscsit_allocate_cmd(struct iscsi_conn *, gfp_t);
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extern int iscsit_sequence_cmd(struct iscsi_conn *, struct iscsi_cmd *,
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unsigned char *, __be32);
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