All of lore.kernel.org
 help / color / mirror / Atom feed
From: Matthew Wilcox <willy@infradead.org>
To: linux-kernel@vger.kernel.org
Cc: Matthew Wilcox <willy@infradead.org>,
	"Nicholas A. Bellinger" <nab@linux-iscsi.org>,
	Bart Van Assche <bart.vanassche@wdc.com>,
	Hannes Reinecke <hare@suse.com>,
	Kees Cook <keescook@chromium.org>,
	Varun Prakash <varun@chelsio.com>,
	Sagi Grimberg <sagi@grimberg.me>,
	Philippe Ombredanne <pombredanne@nexb.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Kate Stewart <kstewart@linuxfoundation.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	"David S. Miller" <davem@davemloft.net>,
	Denys Vlasenko <dvlasenk@redhat.com>,
	linux-scsi@vger.kernel.org, target-devel@vger.kernel.org
Subject: [PATCH 18/26] target/iscsi: Allocate session IDs from an IDA
Date: Thu, 21 Jun 2018 14:28:27 -0700	[thread overview]
Message-ID: <20180621212835.5636-19-willy@infradead.org> (raw)
In-Reply-To: <20180621212835.5636-1-willy@infradead.org>

Since the session is never looked up by ID, we can use the more
space-efficient IDA instead of the IDR.  I think I found a bug where
we never reuse session ID 0, but there may be a good reason for it,
so I've merely documented it in this patch.  Not reusing session ID 0
doesn't even leak memory.

Signed-off-by: Matthew Wilcox <willy@infradead.org>
---
 drivers/target/iscsi/iscsi_target.c       | 10 ++--------
 drivers/target/iscsi/iscsi_target.h       |  4 +---
 drivers/target/iscsi/iscsi_target_login.c | 20 ++++++--------------
 3 files changed, 9 insertions(+), 25 deletions(-)

diff --git a/drivers/target/iscsi/iscsi_target.c b/drivers/target/iscsi/iscsi_target.c
index 8e223799347a..94bad43c41ff 100644
--- a/drivers/target/iscsi/iscsi_target.c
+++ b/drivers/target/iscsi/iscsi_target.c
@@ -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);
diff --git a/drivers/target/iscsi/iscsi_target.h b/drivers/target/iscsi/iscsi_target.h
index 42de1843aa40..48bac0acf8c7 100644
--- a/drivers/target/iscsi/iscsi_target.h
+++ b/drivers/target/iscsi/iscsi_target.h
@@ -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 ***/
diff --git a/drivers/target/iscsi/iscsi_target_login.c b/drivers/target/iscsi/iscsi_target_login.c
index 99501785cdc1..561d2ad38989 100644
--- a/drivers/target/iscsi/iscsi_target_login.c
+++ b/drivers/target/iscsi/iscsi_target_login.c
@@ -336,22 +336,16 @@ 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);
 		kfree(sess);
 		return -ENOMEM;
 	}
 
+	sess->session_index = ret;
 	sess->creation_time = get_jiffies_64();
 	/*
 	 * The FFP CmdSN window values will be allocated from the TPG's
@@ -1163,11 +1157,9 @@ void iscsi_target_login_sess_out(struct iscsi_conn *conn,
 		goto old_sess_out;
 	if (conn->sess->se_sess)
 		transport_free_session(conn->sess->se_sess);
-	if (conn->sess->session_index != 0) {
-		spin_lock_bh(&sess_idr_lock);
-		idr_remove(&sess_idr, conn->sess->session_index);
-		spin_unlock_bh(&sess_idr_lock);
-	}
+	/* Um, 0 is a valid ID.  I suppose we never free it? */
+	if (conn->sess->session_index != 0)
+		ida_free(&sess_ida, conn->sess->session_index);
 	kfree(conn->sess->sess_ops);
 	kfree(conn->sess);
 	conn->sess = NULL;
-- 
2.17.1


WARNING: multiple messages have this Message-ID
From: Matthew Wilcox <willy@infradead.org>
To: linux-kernel@vger.kernel.org
Cc: Matthew Wilcox <willy@infradead.org>,
	"Nicholas A. Bellinger" <nab@linux-iscsi.org>,
	Bart Van Assche <bart.vanassche@wdc.com>,
	Hannes Reinecke <hare@suse.com>,
	Kees Cook <keescook@chromium.org>,
	Varun Prakash <varun@chelsio.com>,
	Sagi Grimberg <sagi@grimberg.me>,
	Philippe Ombredanne <pombredanne@nexb.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Kate Stewart <kstewart@linuxfoundation.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	"David S. Miller" <davem@davemloft.net>,
	Denys Vlasenko <dvlasenk@redhat.com>,
	linux-scsi@vger.kernel.org, target-devel@vger.kernel.org
Subject: [PATCH 18/26] target/iscsi: Allocate session IDs from an IDA
Date: Thu, 21 Jun 2018 21:28:27 +0000	[thread overview]
Message-ID: <20180621212835.5636-19-willy@infradead.org> (raw)
In-Reply-To: <20180621212835.5636-1-willy@infradead.org>

Since the session is never looked up by ID, we can use the more
space-efficient IDA instead of the IDR.  I think I found a bug where
we never reuse session ID 0, but there may be a good reason for it,
so I've merely documented it in this patch.  Not reusing session ID 0
doesn't even leak memory.

Signed-off-by: Matthew Wilcox <willy@infradead.org>
---
 drivers/target/iscsi/iscsi_target.c       | 10 ++--------
 drivers/target/iscsi/iscsi_target.h       |  4 +---
 drivers/target/iscsi/iscsi_target_login.c | 20 ++++++--------------
 3 files changed, 9 insertions(+), 25 deletions(-)

diff --git a/drivers/target/iscsi/iscsi_target.c b/drivers/target/iscsi/iscsi_target.c
index 8e223799347a..94bad43c41ff 100644
--- a/drivers/target/iscsi/iscsi_target.c
+++ b/drivers/target/iscsi/iscsi_target.c
@@ -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);
diff --git a/drivers/target/iscsi/iscsi_target.h b/drivers/target/iscsi/iscsi_target.h
index 42de1843aa40..48bac0acf8c7 100644
--- a/drivers/target/iscsi/iscsi_target.h
+++ b/drivers/target/iscsi/iscsi_target.h
@@ -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 ***/
diff --git a/drivers/target/iscsi/iscsi_target_login.c b/drivers/target/iscsi/iscsi_target_login.c
index 99501785cdc1..561d2ad38989 100644
--- a/drivers/target/iscsi/iscsi_target_login.c
+++ b/drivers/target/iscsi/iscsi_target_login.c
@@ -336,22 +336,16 @@ 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);
 		kfree(sess);
 		return -ENOMEM;
 	}
 
+	sess->session_index = ret;
 	sess->creation_time = get_jiffies_64();
 	/*
 	 * The FFP CmdSN window values will be allocated from the TPG's
@@ -1163,11 +1157,9 @@ void iscsi_target_login_sess_out(struct iscsi_conn *conn,
 		goto old_sess_out;
 	if (conn->sess->se_sess)
 		transport_free_session(conn->sess->se_sess);
-	if (conn->sess->session_index != 0) {
-		spin_lock_bh(&sess_idr_lock);
-		idr_remove(&sess_idr, conn->sess->session_index);
-		spin_unlock_bh(&sess_idr_lock);
-	}
+	/* Um, 0 is a valid ID.  I suppose we never free it? */
+	if (conn->sess->session_index != 0)
+		ida_free(&sess_ida, conn->sess->session_index);
 	kfree(conn->sess->sess_ops);
 	kfree(conn->sess);
 	conn->sess = NULL;
-- 
2.17.1


  parent reply	other threads:[~2018-06-21 21:32 UTC|newest]

Thread overview: 68+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-06-21 21:28 [PATCH 00/26] New IDA API Matthew Wilcox
2018-06-21 21:28 ` [PATCH 01/26] radix tree test suite: fix build Matthew Wilcox
2018-06-21 21:28 ` [PATCH 02/26] ida: Lock the IDA in ida_destroy Matthew Wilcox
2018-06-21 21:28 ` [PATCH 03/26] ida: Add new API Matthew Wilcox
2018-06-21 21:28 ` [PATCH 04/26] mtip32xx: Convert to new IDA API Matthew Wilcox
2018-06-25  8:20   ` Johannes Thumshirn
2018-06-25  8:20     ` Johannes Thumshirn
2018-06-21 21:28 ` [PATCH 05/26] fs: Convert unnamed_dev_ida to new API Matthew Wilcox
2018-06-22 19:45   ` Randy Dunlap
2018-06-22 21:12     ` Matthew Wilcox
2018-06-21 21:28 ` [PATCH 06/26] fs: Convert namespace IDAs " Matthew Wilcox
2018-06-21 21:28 ` [PATCH 07/26] devpts: Convert to new IDA API Matthew Wilcox
2018-06-21 21:28 ` [PATCH 08/26] sd: Convert to new IDA interface Matthew Wilcox
2018-06-21 21:28 ` [PATCH 09/26] osd: Convert to new IDA API Matthew Wilcox
2018-06-21 21:28 ` [PATCH 10/26] rsxx: " Matthew Wilcox
2018-06-21 21:28 ` [PATCH 11/26] cb710: " Matthew Wilcox
2018-06-21 21:33   ` Michał Mirosław
2018-06-21 21:28 ` [PATCH 12/26] Convert net_namespace " Matthew Wilcox
2018-06-21 21:28 ` [PATCH 13/26] ppc: Convert mmu context allocation " Matthew Wilcox
2018-06-22  2:15   ` Nicholas Piggin
2018-06-22  4:38     ` Matthew Wilcox
2018-06-22  4:53       ` Nicholas Piggin
2018-06-22  5:47       ` Aneesh Kumar K.V
2018-06-22  5:47     ` Aneesh Kumar K.V
2018-06-21 21:28 ` [PATCH 14/26] media: Convert entity ID " Matthew Wilcox
2018-07-24 11:05   ` Sakari Ailus
2018-07-30 14:55     ` Mauro Carvalho Chehab
2018-07-31 18:16       ` Matthew Wilcox
2018-06-21 21:28 ` [PATCH 15/26] ppc: Convert vas " Matthew Wilcox
2018-07-05 12:17   ` Matthew Wilcox
2018-06-21 21:28 ` [PATCH 17/26] drm/vmwgfx: Convert " Matthew Wilcox
2018-06-21 21:28 ` Matthew Wilcox [this message]
2018-06-21 21:28   ` [PATCH 18/26] target/iscsi: Allocate session IDs from an IDA Matthew Wilcox
2018-07-26 16:48   ` Mike Christie
2018-07-26 16:48     ` Mike Christie
2018-07-26 16:50     ` Mike Christie
2018-07-26 16:50       ` Mike Christie
2018-07-26 17:13     ` Mike Christie
2018-07-26 17:13       ` Mike Christie
2018-07-26 17:13       ` Mike Christie
2018-07-27 19:38       ` Matthew Wilcox
2018-07-27 19:38         ` Matthew Wilcox
2018-07-27 21:05         ` Mike Christie
2018-07-27 21:05           ` Mike Christie
2018-07-31  2:03           ` Martin K. Petersen
2018-07-31  2:03             ` Martin K. Petersen
2018-07-31 18:15             ` Matthew Wilcox
2018-07-31 18:15               ` Matthew Wilcox
2018-07-31 18:55               ` Mike Christie
2018-07-31 18:55                 ` Mike Christie
2018-06-21 21:28 ` [PATCH 19/26] ida: Start new test_ida module Matthew Wilcox
2018-06-21 21:28 ` [PATCH 20/26] idr-test: Convert ida_check_nomem to new API Matthew Wilcox
2018-06-21 21:28 ` [PATCH 21/26] test_ida: Move ida_check_leaf Matthew Wilcox
2018-06-21 21:28 ` [PATCH 22/26] test_ida: Move ida_check_max Matthew Wilcox
2018-06-21 21:28 ` [PATCH 23/26] test_ida: Convert check_ida_conv to new API Matthew Wilcox
2018-06-21 21:28 ` [PATCH 24/26] test_ida: check_ida_destroy and check_ida_alloc Matthew Wilcox
2018-06-21 21:28 ` [PATCH 25/26] ida: Remove old API Matthew Wilcox
2018-06-21 21:28 ` [PATCH 26/26] ida: Change ida_get_new_above to return the id Matthew Wilcox
2018-06-21 21:28 [16/26] dmaengine: Convert to new IDA API Matthew Wilcox
2018-06-21 21:28 ` [PATCH 16/26] " Matthew Wilcox
2018-06-23 12:30 [16/26] " Vinod Koul
2018-06-23 12:30 ` [PATCH 16/26] " Vinod
2018-06-23 23:06 [16/26] " Matthew Wilcox
2018-06-23 23:06 ` [PATCH 16/26] " Matthew Wilcox
2018-06-24  7:57 [16/26] " Lars-Peter Clausen
2018-06-24  7:57 ` [PATCH 16/26] " Lars-Peter Clausen
2018-06-26 23:00 [16/26] " Matthew Wilcox
2018-06-26 23:00 ` [PATCH 16/26] " Matthew Wilcox

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20180621212835.5636-19-willy@infradead.org \
    --to=willy@infradead.org \
    --cc=bart.vanassche@wdc.com \
    --cc=davem@davemloft.net \
    --cc=dvlasenk@redhat.com \
    --cc=gregkh@linuxfoundation.org \
    --cc=hare@suse.com \
    --cc=keescook@chromium.org \
    --cc=kstewart@linuxfoundation.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-scsi@vger.kernel.org \
    --cc=nab@linux-iscsi.org \
    --cc=pombredanne@nexb.com \
    --cc=sagi@grimberg.me \
    --cc=target-devel@vger.kernel.org \
    --cc=tglx@linutronix.de \
    --cc=varun@chelsio.com \
    --subject='Re: [PATCH 18/26] target/iscsi: Allocate session IDs from an IDA' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.