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drbd: improvements to activate/deactivate multiple activity log extents

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Recent commit drbd: get rid of bio_split, allow bios of "arbitrary" size
had a reference count leak: it only deactivated the first of several
activity log extents for intervals crossing extent boundaries.

This commit generalizes on bios spanning multiple activity log extents
in drbd_al_begin_io, and adds the necessary loop around lc_put in
drbd_al_complete_io as well.

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 2011-04-01 10:38:30 +02:00 committed by Philipp Reisner
parent 23361cf32b
commit e15766e9c9
1 changed files with 23 additions and 23 deletions
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46
drivers/block/drbd/drbd_actlog.c
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@ -209,20 +209,16 @@ void drbd_al_begin_io(struct drbd_conf *mdev, struct drbd_interval *i)
{
/* for bios crossing activity log extent boundaries,
* we may need to activate two extents in one go */
unsigned int enr[2];
struct lc_element *al_ext[2] = { NULL, NULL };
struct update_al_work al_work;
unsigned first = i->sector >> (AL_EXTENT_SHIFT-9);
unsigned last = (i->sector + (i->size >> 9) - 1) >> (AL_EXTENT_SHIFT-9);
unsigned enr;
D_ASSERT(atomic_read(&mdev->local_cnt) > 0);
enr[0] = i->sector >> (AL_EXTENT_SHIFT-9);
enr[1] = (i->sector + (i->size >> 9) - 1) >> (AL_EXTENT_SHIFT-9);
wait_event(mdev->al_wait, (al_ext[0] = _al_get(mdev, enr[0])));
if (enr[0] != enr[1])
wait_event(mdev->al_wait, (al_ext[1] = _al_get(mdev, enr[1])));
for (enr = first; enr <= last; enr++)
wait_event(mdev->al_wait, _al_get(mdev, enr) != NULL);
if (al_ext[0]->lc_number != enr[0] ||
(al_ext[1] && al_ext[1]->lc_number != enr[1])) {
if (mdev->act_log->pending_changes) {
/* drbd_al_write_transaction(mdev,al_ext,enr);
* recurses into generic_make_request(), which
* disallows recursion, bios being serialized on the
@ -239,8 +235,8 @@ 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 (al_ext[0]->lc_number != enr[0] ||
(al_ext[1] && al_ext[1]->lc_number != enr[1])) {
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;
@ -264,24 +260,28 @@ void drbd_al_begin_io(struct drbd_conf *mdev, struct drbd_interval *i)
void drbd_al_complete_io(struct drbd_conf *mdev, struct drbd_interval *i)
{
unsigned int enr = (i->sector >> (AL_EXTENT_SHIFT-9));
/* for bios crossing activity log extent boundaries,
* we may need to activate two extents in one go */
unsigned first = i->sector >> (AL_EXTENT_SHIFT-9);
unsigned last = (i->sector + (i->size >> 9) - 1) >> (AL_EXTENT_SHIFT-9);
unsigned enr;
struct lc_element *extent;
unsigned long flags;
bool wake = false;
spin_lock_irqsave(&mdev->al_lock, flags);
extent = lc_find(mdev->act_log, enr);
if (!extent) {
spin_unlock_irqrestore(&mdev->al_lock, flags);
dev_err(DEV, "al_complete_io() called on inactive extent %u\n", enr);
return;
for (enr = first; enr <= last; enr++) {
extent = lc_find(mdev->act_log, enr);
if (!extent) {
dev_err(DEV, "al_complete_io() called on inactive extent %u\n", enr);
continue;
}
if (lc_put(mdev->act_log, extent) == 0)
wake = true;
}
if (lc_put(mdev->act_log, extent) == 0)
wake_up(&mdev->al_wait);
spin_unlock_irqrestore(&mdev->al_lock, flags);
wake_up(&mdev->al_wait);
}
#if (PAGE_SHIFT + 3) < (AL_EXTENT_SHIFT - BM_BLOCK_SHIFT)