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Commit 31ff0cee authored by Matthew Wilcox's avatar Matthew Wilcox
Browse files

target/iscsi: Allocate session IDs from an IDA 



Since the session is never looked up by ID, we can use the more
space-efficient IDA instead of the IDR.

Signed-off-by: default avatarMatthew Wilcox <willy@infradead.org>
parent 26abc916

drivers/target/iscsi/iscsi_target.c

+2 −8
Original line number Diff line number Diff line
@@ -57,9 +57,8 @@ static DEFINE_SPINLOCK(tiqn_lock); 
static DEFINE_MUTEX(np_lock);



static struct idr tiqn_idr;

struct idr sess_idr;

DEFINE_IDA(sess_ida);

struct mutex auth_id_lock;

spinlock_t sess_idr_lock;



struct iscsit_global *iscsit_global;
@@ -700,9 +699,7 @@ static int __init iscsi_target_init_module(void) 


	spin_lock_init(&iscsit_global->ts_bitmap_lock);

	mutex_init(&auth_id_lock);

	spin_lock_init(&sess_idr_lock);

	idr_init(&tiqn_idr);

	idr_init(&sess_idr);



	ret = target_register_template(&iscsi_ops);

	if (ret)
@@ -4375,10 +4372,7 @@ int iscsit_close_session(struct iscsi_session *sess) 
	pr_debug("Decremented number of active iSCSI Sessions on"

		" iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);



	spin_lock(&sess_idr_lock);

	idr_remove(&sess_idr, sess->session_index);

	spin_unlock(&sess_idr_lock);



	ida_free(&sess_ida, sess->session_index);

	kfree(sess->sess_ops);

	sess->sess_ops = NULL;

	spin_unlock_bh(&se_tpg->session_lock);

drivers/target/iscsi/iscsi_target.h

+1 −3
Original line number Diff line number Diff line
@@ -55,9 +55,7 @@ extern struct kmem_cache *lio_ooo_cache; 
extern struct kmem_cache *lio_qr_cache;

extern struct kmem_cache *lio_r2t_cache;



extern struct idr sess_idr;

extern struct ida sess_ida;

extern struct mutex auth_id_lock;

extern spinlock_t sess_idr_lock;





#endif   /*** ISCSI_TARGET_H ***/

drivers/target/iscsi/iscsi_target_login.c

+7 −19
Original line number Diff line number Diff line
@@ -336,21 +336,15 @@ static int iscsi_login_zero_tsih_s1( 
	timer_setup(&sess->time2retain_timer,

		    iscsit_handle_time2retain_timeout, 0);



	idr_preload(GFP_KERNEL);

	spin_lock_bh(&sess_idr_lock);

	ret = idr_alloc(&sess_idr, NULL, 0, 0, GFP_NOWAIT);

	if (ret >= 0)

		sess->session_index = ret;

	spin_unlock_bh(&sess_idr_lock);

	idr_preload_end();



	ret = ida_alloc(&sess_ida, GFP_KERNEL);

	if (ret < 0) {

		pr_err("idr_alloc() for sess_idr failed\n");

		pr_err("Session ID allocation failed %d\n", ret);

		iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,

				ISCSI_LOGIN_STATUS_NO_RESOURCES);

		goto free_sess;

	}



	sess->session_index = ret;

	sess->creation_time = get_jiffies_64();

	/*

	 * The FFP CmdSN window values will be allocated from the TPG's
@@ -364,7 +358,7 @@ static int iscsi_login_zero_tsih_s1( 
				ISCSI_LOGIN_STATUS_NO_RESOURCES);

		pr_err("Unable to allocate memory for"

				" struct iscsi_sess_ops.\n");

		goto remove_idr;

		goto free_id;

	}



	sess->se_sess = transport_init_session(TARGET_PROT_NORMAL);
@@ -378,10 +372,8 @@ static int iscsi_login_zero_tsih_s1( 


free_ops:

	kfree(sess->sess_ops);

remove_idr:

	spin_lock_bh(&sess_idr_lock);

	idr_remove(&sess_idr, sess->session_index);

	spin_unlock_bh(&sess_idr_lock);

free_id:

	ida_free(&sess_ida, sess->session_index);

free_sess:

	kfree(sess);

	conn->sess = NULL;
@@ -1170,11 +1162,7 @@ void iscsi_target_login_sess_out(struct iscsi_conn *conn, 
		goto old_sess_out;



	transport_free_session(conn->sess->se_sess);



	spin_lock_bh(&sess_idr_lock);

	idr_remove(&sess_idr, conn->sess->session_index);

	spin_unlock_bh(&sess_idr_lock);



	ida_free(&sess_ida, conn->sess->session_index);

	kfree(conn->sess->sess_ops);

	kfree(conn->sess);

	conn->sess = NULL;