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drbd: Do no sleep long in drbd_start_resync

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Work items that sleep too long can cause requests to take as
long as the longest sleeping work item.

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
This commit is contained in:
Philipp Reisner 2011-02-05 17:34:11 +01:00
parent 1f04af33fe
commit e64a329459
2 changed files with 37 additions and 22 deletions
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1
drivers/block/drbd/drbd_int.h
View File

@ -787,6 +787,7 @@ enum {
NEW_CUR_UUID, /* Create new current UUID when thawing IO */
AL_SUSPENDED, /* Activity logging is currently suspended. */
AHEAD_TO_SYNC_SOURCE, /* Ahead -> SyncSource queued */
B_RS_H_DONE, /* Before resync handler done (already executed) */
};
struct drbd_bitmap; /* opaque for drbd_conf */

58
drivers/block/drbd/drbd_worker.c
View File

@ -1487,35 +1487,49 @@ void drbd_start_resync(struct drbd_conf *mdev, enum drbd_conns side)
Ahead/Behind and SyncSource/SyncTarget */
}
if (side == C_SYNC_TARGET) {
/* Since application IO was locked out during C_WF_BITMAP_T and
C_WF_SYNC_UUID we are still unmodified. Before going to C_SYNC_TARGET
we check that we might make the data inconsistent. */
r = drbd_khelper(mdev, "before-resync-target");
r = (r >> 8) & 0xff;
if (r > 0) {
dev_info(DEV, "before-resync-target handler returned %d, "
"dropping connection.\n", r);
drbd_force_state(mdev, NS(conn, C_DISCONNECTING));
return;
}
} else /* C_SYNC_SOURCE */ {
r = drbd_khelper(mdev, "before-resync-source");
r = (r >> 8) & 0xff;
if (r > 0) {
if (r == 3) {
dev_info(DEV, "before-resync-source handler returned %d, "
"ignoring. Old userland tools?", r);
} else {
dev_info(DEV, "before-resync-source handler returned %d, "
if (!test_bit(B_RS_H_DONE, &mdev->flags)) {
if (side == C_SYNC_TARGET) {
/* Since application IO was locked out during C_WF_BITMAP_T and
C_WF_SYNC_UUID we are still unmodified. Before going to C_SYNC_TARGET
we check that we might make the data inconsistent. */
r = drbd_khelper(mdev, "before-resync-target");
r = (r >> 8) & 0xff;
if (r > 0) {
dev_info(DEV, "before-resync-target handler returned %d, "
"dropping connection.\n", r);
drbd_force_state(mdev, NS(conn, C_DISCONNECTING));
return;
}
} else /* C_SYNC_SOURCE */ {
r = drbd_khelper(mdev, "before-resync-source");
r = (r >> 8) & 0xff;
if (r > 0) {
if (r == 3) {
dev_info(DEV, "before-resync-source handler returned %d, "
"ignoring. Old userland tools?", r);
} else {
dev_info(DEV, "before-resync-source handler returned %d, "
"dropping connection.\n", r);
drbd_force_state(mdev, NS(conn, C_DISCONNECTING));
return;
}
}
}
}
drbd_state_lock(mdev);
if (current == mdev->tconn->worker.task) {
/* The worker should not sleep waiting for drbd_state_lock(),
that can take long */
if (test_and_set_bit(CLUSTER_ST_CHANGE, &mdev->flags)) {
set_bit(B_RS_H_DONE, &mdev->flags);
mdev->start_resync_timer.expires = jiffies + HZ/5;
add_timer(&mdev->start_resync_timer);
return;
}
} else {
drbd_state_lock(mdev);
}
clear_bit(B_RS_H_DONE, &mdev->flags);
if (!get_ldev_if_state(mdev, D_NEGOTIATING)) {
drbd_state_unlock(mdev);