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drbd: Fixed w_restart_disk_io() to handle non active AL-extents 

Since we now apply the AL in user space onto the bitmap, the AL
is not active for the requests we want to reply.

For that a al_write_transaction() that might be called from
worker context became necessary.

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 2011-07-15 17:19:02 +02:00
parent 9b743da96c
commit 1b7ab15b11
2 changed files with 45 additions and 29 deletions
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70
drivers/block/drbd/drbd_actlog.c
View File

@ -112,7 +112,7 @@ struct drbd_atodb_wait {
};
static int w_al_write_transaction(struct drbd_work *, int);
static int al_write_transaction(struct drbd_conf *mdev);
void *drbd_md_get_buffer(struct drbd_conf *mdev)
{
@ -272,18 +272,13 @@ void drbd_al_begin_io(struct drbd_conf *mdev, struct drbd_interval *i)
/* Double check: it may have been committed by someone else,
* while we have been waiting for the lock. */
if (mdev->act_log->pending_changes) {
struct update_al_work al_work;
init_completion(&al_work.event);
al_work.w.cb = w_al_write_transaction;
al_work.w.mdev = mdev;
drbd_queue_work_front(&mdev->tconn->data.work, &al_work.w);
wait_for_completion(&al_work.event);
int err;
err = al_write_transaction(mdev);
mdev->al_writ_cnt++;
spin_lock_irq(&mdev->al_lock);
/* FIXME
if (al_work.err)
if (err)
we need an "lc_cancel" here;
*/
lc_committed(mdev->act_log);
@ -348,23 +343,20 @@ static unsigned int rs_extent_to_bm_page(unsigned int rs_enr)
}
static int
w_al_write_transaction(struct drbd_work *w, int unused)
_al_write_transaction(struct drbd_conf *mdev)
{
struct update_al_work *aw = container_of(w, struct update_al_work, w);
struct drbd_conf *mdev = w->mdev;
struct al_transaction_on_disk *buffer;
struct lc_element *e;
sector_t sector;
int i, mx;
unsigned extent_nr;
unsigned crc = 0;
int err = 0;
if (!get_ldev(mdev)) {
dev_err(DEV, "disk is %s, cannot start al transaction\n",
drbd_disk_str(mdev->state.disk));
aw->err = -EIO;
complete(&((struct update_al_work *)w)->event);
return 0;
return -EIO;
}
/* The bitmap write may have failed, causing a state change. */
@ -372,19 +364,15 @@ w_al_write_transaction(struct drbd_work *w, int unused)
dev_err(DEV,
"disk is %s, cannot write al transaction\n",
drbd_disk_str(mdev->state.disk));
aw->err = -EIO;
complete(&((struct update_al_work *)w)->event);
put_ldev(mdev);
return 0;
return -EIO;
}
buffer = drbd_md_get_buffer(mdev); /* protects md_io_buffer, al_tr_cycle, ... */
if (!buffer) {
dev_err(DEV, "disk failed while waiting for md_io buffer\n");
aw->err = -EIO;
complete(&((struct update_al_work *)w)->event);
put_ldev(mdev);
return 1;
return -ENODEV;
}
memset(buffer, 0, sizeof(*buffer));
@ -444,10 +432,10 @@ w_al_write_transaction(struct drbd_work *w, int unused)
buffer->crc32c = cpu_to_be32(crc);
if (drbd_bm_write_hinted(mdev))
aw->err = -EIO;
err = -EIO;
/* drbd_chk_io_error done already */
else if (drbd_md_sync_page_io(mdev, mdev->ldev, sector, WRITE)) {
aw->err = -EIO;
err = -EIO;
drbd_chk_io_error(mdev, 1, true);
} else {
/* advance ringbuffer position and transaction counter */
@ -456,10 +444,42 @@ w_al_write_transaction(struct drbd_work *w, int unused)
}
drbd_md_put_buffer(mdev);
complete(&((struct update_al_work *)w)->event);
put_ldev(mdev);
return 0;
return err;
}
static int w_al_write_transaction(struct drbd_work *w, int unused)
{
struct update_al_work *aw = container_of(w, struct update_al_work, w);
struct drbd_conf *mdev = w->mdev;
int err;
err = _al_write_transaction(mdev);
aw->err = err;
complete(&aw->event);
return err != -EIO ? err : 0;
}
/* Calls from worker context (see w_restart_disk_io()) need to write the
transaction directly. Others came through generic_make_request(),
those need to delegate it to the worker. */
static int al_write_transaction(struct drbd_conf *mdev)
{
struct update_al_work al_work;
if (current == mdev->tconn->worker.task)
return _al_write_transaction(mdev);
init_completion(&al_work.event);
al_work.w.cb = w_al_write_transaction;
al_work.w.mdev = mdev;
drbd_queue_work_front(&mdev->tconn->data.work, &al_work.w);
wait_for_completion(&al_work.event);
return al_work.err;
}
static int _try_lc_del(struct drbd_conf *mdev, struct lc_element *al_ext)

4
drivers/block/drbd/drbd_worker.c
View File

@ -1333,10 +1333,6 @@ int w_restart_disk_io(struct drbd_work *w, int cancel)
if (bio_data_dir(req->master_bio) == WRITE && req->rq_state & RQ_IN_ACT_LOG)
drbd_al_begin_io(mdev, &req->i);
/* Calling drbd_al_begin_io() out of the worker might deadlocks
theoretically. Practically it can not deadlock, since this is
only used when unfreezing IOs. All the extents of the requests
that made it into the TL are already active */
drbd_req_make_private_bio(req, req->master_bio);
req->private_bio->bi_bdev = mdev->ldev->backing_bdev;