From mboxrd@z Thu Jan 1 00:00:00 1970 From: NeilBrown Subject: [md PATCH 06/13] md: md_stop_writes requires mddev_lock. Date: Wed, 12 Jan 2011 09:12:46 +1100 Message-ID: <20110111221246.12732.27399.stgit@notabene.brown> References: <20110111221050.12732.31647.stgit@notabene.brown> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20110111221050.12732.31647.stgit@notabene.brown> Sender: linux-raid-owner@vger.kernel.org To: linux-raid@vger.kernel.org List-Id: linux-raid.ids As md_stop_writes manipulates the sync_thread and calls md_update_sb, it need to be called with mddev_lock held. In all internal cases it is, but the symbol is exported for dm-raid to call and in that case the lock won't be help. Do make an exported version which takes the lock, and an internal version which does not. Signed-off-by: NeilBrown --- drivers/md/md.c | 13 ++++++++++--- 1 files changed, 10 insertions(+), 3 deletions(-) diff --git a/drivers/md/md.c b/drivers/md/md.c index 540347c..f43ff29 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -4704,7 +4704,7 @@ static void md_clean(mddev_t *mddev) mddev->plug = NULL; } -void md_stop_writes(mddev_t *mddev) +static void __md_stop_writes(mddev_t *mddev) { if (mddev->sync_thread) { set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); @@ -4724,6 +4724,13 @@ void md_stop_writes(mddev_t *mddev) md_update_sb(mddev, 1); } } + +void md_stop_writes(mddev_t *mddev) +{ + mddev_lock(mddev); + __md_stop_writes(mddev); + mddev_unlock(mddev); +} EXPORT_SYMBOL_GPL(md_stop_writes); void md_stop(mddev_t *mddev) @@ -4748,7 +4755,7 @@ static int md_set_readonly(mddev_t *mddev, int is_open) goto out; } if (mddev->pers) { - md_stop_writes(mddev); + __md_stop_writes(mddev); err = -ENXIO; if (mddev->ro==1) @@ -4785,7 +4792,7 @@ static int do_md_stop(mddev_t * mddev, int mode, int is_open) if (mddev->ro) set_disk_ro(disk, 0); - md_stop_writes(mddev); + __md_stop_writes(mddev); md_stop(mddev); mddev->queue->merge_bvec_fn = NULL; mddev->queue->unplug_fn = NULL;