void drbd_al_begin_io(struct drbd_conf *mdev, sector_t sector)
{
unsigned int enr = (sector >> (AL_EXTENT_SHIFT-9));
struct lc_element *al_ext;
struct update_al_work al_work;
D_ASSERT(atomic_read(&mdev->local_cnt) > 0);
wait_event(mdev->al_wait, (al_ext = _al_get(mdev, enr)));
if (al_ext->lc_number != enr) {
/* drbd_al_write_transaction(mdev,al_ext,enr);
* recurses into generic_make_request(), which
* disallows recursion, bios being serialized on the
* current->bio_tail list now.
* we have to delegate updates to the activity log
* to the worker thread. */
init_completion(&al_work.event);
al_work.al_ext = al_ext;
al_work.enr = enr;
al_work.old_enr = al_ext->lc_number;
al_work.w.cb = w_al_write_transaction;
drbd_queue_work_front(&mdev->data.work, &al_work.w);
wait_for_completion(&al_work.event);
mdev->al_writ_cnt++;
spin_lock_irq(&mdev->al_lock);
lc_changed(mdev->act_log, al_ext);
spin_unlock_irq(&mdev->al_lock);
wake_up(&mdev->al_wait);
}
}
/* ATTENTION. The AL's extents are 4MB each, while the extents in the
* resync LRU-cache are 16MB each.
* The caller of this function has to hold an get_ldev() reference.
*
* TODO will be obsoleted once we have a caching lru of the on disk bitmap
*/
STATIC void drbd_try_clear_on_disk_bm(struct drbd_conf *mdev, sector_t sector,
int count, int success)
{
struct lc_element *e;
struct update_odbm_work *udw;
unsigned int enr;
D_ASSERT(atomic_read(&mdev->local_cnt));
/* I simply assume that a sector/size pair never crosses
* a 16 MB extent border. (Currently this is true...) */
enr = BM_SECT_TO_EXT(sector);
e = lc_get(mdev->resync, enr);
if (e) {
struct bm_extent *ext = lc_entry(e, struct bm_extent, lce);
if (ext->lce.lc_number == enr) {
if (success)
ext->rs_left -= count;
else
ext->rs_failed += count;
if (ext->rs_left < ext->rs_failed) {
dev_err(DEV, "BAD! sector=%llus enr=%u rs_left=%d "
"rs_failed=%d count=%d\n",
(unsigned long long)sector,
ext->lce.lc_number, ext->rs_left,
ext->rs_failed, count);
dump_stack();
lc_put(mdev->resync, &ext->lce);
drbd_force_state(mdev, NS(conn, C_DISCONNECTING));
return;
}
} else {
/* Normally this element should be in the cache,
* since drbd_rs_begin_io() pulled it already in.
*
* But maybe an application write finished, and we set
* something outside the resync lru_cache in sync.
*/
int rs_left = drbd_bm_e_weight(mdev, enr);
if (ext->flags != 0) {
dev_warn(DEV, "changing resync lce: %d[%u;%02lx]"
" -> %d[%u;00]\n",
ext->lce.lc_number, ext->rs_left,
ext->flags, enr, rs_left);
ext->flags = 0;
}
if (ext->rs_failed) {
dev_warn(DEV, "Kicking resync_lru element enr=%u "
"out with rs_failed=%d\n",
ext->lce.lc_number, ext->rs_failed);
}
ext->rs_left = rs_left;
ext->rs_failed = success ? 0 : count;
lc_changed(mdev->resync, &ext->lce);
}
lc_put(mdev->resync, &ext->lce);
/* no race, we are within the al_lock! */
if (ext->rs_left == ext->rs_failed) {
ext->rs_failed = 0;
udw = kmalloc(sizeof(*udw), GFP_ATOMIC);
if (udw) {
udw->enr = ext->lce.lc_number;
udw->w.cb = w_update_odbm;
drbd_queue_work_front(&mdev->data.work, &udw->w);
} else {
dev_warn(DEV, "Could not kmalloc an udw\n");
}
}
} else {