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| author | Philipp Reisner <philipp.reisner@linbit.com> | 2010-12-22 12:48:31 +0100 |
|---|---|---|
| committer | Philipp Reisner <philipp.reisner@linbit.com> | 2011-03-10 11:45:23 +0100 |
| commit | 617049aa7d753e8c821ac77126ab90e9f1b66d6d (patch) | |
| tree | 1cabbc19e2efa054bf585d92f42c0bf7bf0c01b5 /drivers/block/drbd/drbd_main.c | |
| parent | 071942727824bab03b1a3f6b6eeb5b269697b333 (diff) | |
| download | lwn-617049aa7d753e8c821ac77126ab90e9f1b66d6d.tar.gz lwn-617049aa7d753e8c821ac77126ab90e9f1b66d6d.zip | |
drbd: Fixed an issue with AHEAD -> SYNC_SOURCE transitions
Create a new barrier when leaving the AHEAD mode.
Otherwise we trigger the assertion in req_mod(, barrier_acked)
D_ASSERT(req->rq_state & RQ_NET_SENT);
The new barrier is created by recycling the newest existing one.
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_main.c')
| -rw-r--r-- | drivers/block/drbd/drbd_main.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/drivers/block/drbd/drbd_main.c b/drivers/block/drbd/drbd_main.c index 9bd53cf2cdb2..90050ab7adf3 100644 --- a/drivers/block/drbd/drbd_main.c +++ b/drivers/block/drbd/drbd_main.c @@ -335,6 +335,24 @@ bail: drbd_force_state(mdev, NS(conn, C_PROTOCOL_ERROR)); } + +/* In C_AHEAD mode only out_of_sync packets are sent for requests. Detach + * those requests from the newsest barrier when changing to an other cstate. + * + * That headless list vanishes when the last request finished its write or + * send out_of_sync packet. */ +static void tl_forget(struct drbd_conf *mdev) +{ + struct drbd_tl_epoch *b; + + if (test_bit(CREATE_BARRIER, &mdev->flags)) + return; + + b = mdev->newest_tle; + list_del(&b->requests); + _tl_add_barrier(mdev, b); +} + /** * _tl_restart() - Walks the transfer log, and applies an action to all requests * @mdev: DRBD device. @@ -1242,6 +1260,9 @@ __drbd_set_state(struct drbd_conf *mdev, union drbd_state ns, if (os.conn < C_CONNECTED && ns.conn >= C_CONNECTED) drbd_resume_al(mdev); + if (os.conn == C_AHEAD && ns.conn != C_AHEAD) + tl_forget(mdev); + ascw = kmalloc(sizeof(*ascw), GFP_ATOMIC); if (ascw) { ascw->os = os; |