aboutsummaryrefslogtreecommitdiff
path: root/drivers/block/drbd/drbd_nl.c
diff options
context:
space:
mode:
authorLars Ellenberg <lars.ellenberg@linbit.com>2012-07-30 09:08:25 +0200
committerPhilipp Reisner <philipp.reisner@linbit.com>2012-11-08 16:58:39 +0100
commit6f3465ed82b10922effe364676103cbd4f2bcd81 (patch)
tree9dc3f63d3faffecd49cac56a3affc55b1df08ae8 /drivers/block/drbd/drbd_nl.c
parent0c849666016cbf541c1030eec55f5f8dd1fba513 (diff)
downloadvexpress-lsk-6f3465ed82b10922effe364676103cbd4f2bcd81.tar.gz
drbd: report congestion if we are waiting for some userland callback
If the drbd worker thread is synchronously waiting for some userland callback, we don't want some casual pageout to block on us. Have drbd_congested() report congestion in that case. Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
Diffstat (limited to 'drivers/block/drbd/drbd_nl.c')
-rw-r--r--drivers/block/drbd/drbd_nl.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/drivers/block/drbd/drbd_nl.c b/drivers/block/drbd/drbd_nl.c
index d4c05e26a13..05ed4804c72 100644
--- a/drivers/block/drbd/drbd_nl.c
+++ b/drivers/block/drbd/drbd_nl.c
@@ -323,11 +323,15 @@ int drbd_khelper(struct drbd_conf *mdev, char *cmd)
NULL };
char mb[12];
char *argv[] = {usermode_helper, cmd, mb, NULL };
+ struct drbd_tconn *tconn = mdev->tconn;
struct sib_info sib;
int ret;
+ if (current == tconn->worker.task)
+ set_bit(CALLBACK_PENDING, &tconn->flags);
+
snprintf(mb, 12, "minor-%d", mdev_to_minor(mdev));
- setup_khelper_env(mdev->tconn, envp);
+ setup_khelper_env(tconn, envp);
/* The helper may take some time.
* write out any unsynced meta data changes now */
@@ -350,6 +354,9 @@ int drbd_khelper(struct drbd_conf *mdev, char *cmd)
sib.helper_exit_code = ret;
drbd_bcast_event(mdev, &sib);
+ if (current == tconn->worker.task)
+ clear_bit(CALLBACK_PENDING, &tconn->flags);
+
if (ret < 0) /* Ignore any ERRNOs we got. */
ret = 0;