From 495d357301e1de01fabe30ce9a555301fb4675c3 Mon Sep 17 00:00:00 2001 From: NeilBrown Date: Thu, 18 Jun 2009 08:49:42 +1000 Subject: md/linear: use call_rcu to free obsolete 'conf' structures. Current, when we update the 'conf' structure, when adding a drive to a linear array, we keep the old version around until the array is finally stopped, as it is not safe to free it immediately. Now that we have rcu protection on all accesses to 'conf', we can use call_rcu to free it more promptly. Signed-off-by: NeilBrown --- drivers/md/linear.c | 21 +++++++++++++-------- 1 file changed, 13 insertions(+), 8 deletions(-) (limited to 'drivers/md/linear.c') diff --git a/drivers/md/linear.c b/drivers/md/linear.c index 93f2b1d18398..15c8b7b25a9b 100644 --- a/drivers/md/linear.c +++ b/drivers/md/linear.c @@ -223,6 +223,12 @@ static int linear_run (mddev_t *mddev) return 0; } +static void free_conf(struct rcu_head *head) +{ + linear_conf_t *conf = container_of(head, linear_conf_t, rcu); + kfree(conf); +} + static int linear_add(mddev_t *mddev, mdk_rdev_t *rdev) { /* Adding a drive to a linear array allows the array to grow. @@ -233,7 +239,7 @@ static int linear_add(mddev_t *mddev, mdk_rdev_t *rdev) * The current one is never freed until the array is stopped. * This avoids races. */ - linear_conf_t *newconf; + linear_conf_t *newconf, *oldconf; if (rdev->saved_raid_disk != mddev->raid_disks) return -EINVAL; @@ -245,11 +251,12 @@ static int linear_add(mddev_t *mddev, mdk_rdev_t *rdev) if (!newconf) return -ENOMEM; - newconf->prev = mddev->private; + oldconf = rcu_dereference(mddev->private); mddev->raid_disks++; rcu_assign_pointer(mddev->private, newconf); md_set_array_sectors(mddev, linear_size(mddev, 0, 0)); set_capacity(mddev->gendisk, mddev->array_sectors); + call_rcu(&oldconf->rcu, free_conf); return 0; } @@ -261,14 +268,12 @@ static int linear_stop (mddev_t *mddev) * We do not require rcu protection here since * we hold reconfig_mutex for both linear_add and * linear_stop, so they cannot race. + * We should make sure any old 'conf's are properly + * freed though. */ - + rcu_barrier(); blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/ - do { - linear_conf_t *t = conf->prev; - kfree(conf); - conf = t; - } while (conf); + kfree(conf); return 0; } -- cgit v1.2.3