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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>
This commit is contained in:
Lars Ellenberg 2012-06-14 15:14:06 +02:00 committed by Philipp Reisner
parent 383606e0de
commit c2ba686f35
3 changed files with 29 additions and 0 deletions
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7
drivers/block/drbd/drbd_int.h
View File

@ -850,6 +850,13 @@ enum {
AL_SUSPENDED, /* Activity logging is currently suspended. */
AHEAD_TO_SYNC_SOURCE, /* Ahead -> SyncSource queued */
STATE_SENT, /* Do not change state/UUIDs while this is set */
CALLBACK_PENDING, /* Whether we have a call_usermodehelper(, UMH_WAIT_PROC)
* pending, from drbd worker context.
* If set, bdi_write_congested() returns true,
* so shrink_page_list() would not recurse into,
* and potentially deadlock on, this drbd worker.
*/
};
struct drbd_bitmap; /* opaque for drbd_conf */

16
drivers/block/drbd/drbd_main.c
View File

@ -3553,6 +3553,22 @@ static int drbd_congested(void *congested_data, int bdi_bits)
goto out;
}
if (test_bit(CALLBACK_PENDING, &mdev->flags)) {
r |= (1 << BDI_async_congested);
/* Without good local data, we would need to read from remote,
* and that would need the worker thread as well, which is
* currently blocked waiting for that usermode helper to
* finish.
*/
if (!get_ldev_if_state(mdev, D_UP_TO_DATE))
r |= (1 << BDI_sync_congested);
else
put_ldev(mdev);
r &= bdi_bits;
reason = 'c';
goto out;
}
if (get_ldev(mdev)) {
q = bdev_get_queue(mdev->ldev->backing_bdev);
r = bdi_congested(&q->backing_dev_info, bdi_bits);

6
drivers/block/drbd/drbd_nl.c
View File

@ -147,6 +147,9 @@ int drbd_khelper(struct drbd_conf *mdev, char *cmd)
char *argv[] = {usermode_helper, cmd, mb, NULL };
int ret;
if (current == mdev->worker.task)
set_bit(CALLBACK_PENDING, &mdev->flags);
snprintf(mb, 12, "minor-%d", mdev_to_minor(mdev));
if (get_net_conf(mdev)) {
@ -189,6 +192,9 @@ int drbd_khelper(struct drbd_conf *mdev, char *cmd)
usermode_helper, cmd, mb,
(ret >> 8) & 0xff, ret);
if (current == mdev->worker.task)
clear_bit(CALLBACK_PENDING, &mdev->flags);
if (ret < 0) /* Ignore any ERRNOs we got. */
ret = 0;