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iscsi-target: Convert iscsi_thread_set usage to kthread.h

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This patch converts iscsi-target code to use modern kthread.h API
callers for creating RX/TX threads for each new iscsi_conn descriptor,
and releasing associated RX/TX threads during connection shutdown.

This is done using iscsit_start_kthreads() -> kthread_run() to start
new kthreads from within iscsi_post_login_handler(), and invoking
kthread_stop() from existing iscsit_close_connection() code.

Also, convert iscsit_logout_post_handler_closesession() code to use
cmpxchg when determing when iscsit_cause_connection_reinstatement()
needs to sleep waiting for completion.

Reported-by: Sagi Grimberg <sagig@mellanox.com>
Tested-by: Sagi Grimberg <sagig@mellanox.com>
Cc: Slava Shwartsman <valyushash@gmail.com>
Cc: <stable@vger.kernel.org> # v3.10+
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Nicholas Bellinger
2015-02-26 22:19:15 -08:00
parent 5bc6510f91
commit 88dcd2dab5
4 changed files with 114 additions and 69 deletions
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7
include/target/iscsi/iscsi_target_core.h
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@@ -602,6 +602,11 @@ struct iscsi_conn {
struct iscsi_session *sess;
/* Pointer to thread_set in use for this conn's threads */
struct iscsi_thread_set *thread_set;
int bitmap_id;
int rx_thread_active;
struct task_struct *rx_thread;
int tx_thread_active;
struct task_struct *tx_thread;
/* list_head for session connection list */
struct list_head conn_list;
} ____cacheline_aligned;
@@ -871,10 +876,12 @@ struct iscsit_global {
/* Unique identifier used for the authentication daemon */
u32 auth_id;
u32 inactive_ts;
#define ISCSIT_BITMAP_BITS 262144
/* Thread Set bitmap count */
int ts_bitmap_count;
/* Thread Set bitmap pointer */
unsigned long *ts_bitmap;
spinlock_t ts_bitmap_lock;
/* Used for iSCSI discovery session authentication */
struct iscsi_node_acl discovery_acl;
struct iscsi_portal_group *discovery_tpg;