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pin mref during phase1_endio (for safety)

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Thomas Schoebel-Theuer 2012-02-08 11:18:04 +01:00 committed by Thomas Schoebel-Theuer
parent f5b1b27a91
commit c122773d6a
2 changed files with 18 additions and 5 deletions
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2
mars_if.c
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@ -89,7 +89,7 @@ void if_endio(struct generic_callback *cb)
bio = biow->bio;
CHECK_PTR_NULL(bio, err);
#if 1
#if 0
if (mref_a->is_kmapped) {
struct bio_vec *bvec;
int i;

21
mars_trans_logger.c
View File

@ -1283,12 +1283,12 @@ void _complete(struct trans_logger_brick *brick, struct trans_logger_mref_aspect
goto done;
}
orig_mref_a->is_completed = true;
if (likely(error >= 0)) {
orig_mref->ref_flags &= ~MREF_WRITING;
orig_mref->ref_flags |= MREF_UPTODATE;
}
CHECKED_CALLBACK(orig_mref, error, err);
orig_mref_a->is_completed = true;
done:
return;
@ -1323,6 +1323,7 @@ err:
static noinline
void phase1_endio(void *private, int error)
{
struct mref_object *orig_mref;
struct trans_logger_mref_aspect *orig_mref_a;
struct trans_logger_brick *brick;
@ -1330,20 +1331,32 @@ void phase1_endio(void *private, int error)
CHECK_PTR(orig_mref_a, err);
brick = orig_mref_a->my_brick;
CHECK_PTR(brick, err);
orig_mref = orig_mref_a->object;
CHECK_PTR(orig_mref, err);
qq_dec_flying(&brick->q_phase1);
/* Queue up for the next phase.
* This will pin mref->ref_count so it can't go away
/* Pin mref->ref_count so it can't go away
* after _complete().
*/
qq_mref_insert(&brick->q_phase2, orig_mref_a);
CHECK_ATOMIC(&orig_mref->ref_count, 1);
_CHECK(orig_mref_a->shadow_ref, err);
atomic_inc(&orig_mref->ref_count); // must be paired with __trans_logger_ref_put()
atomic_inc(&brick->inner_balance_count);
#ifndef LATE_COMPLETE
// signal completion to the upper layer
_complete(brick, orig_mref_a, error, false);
#endif
/* Queue up for the next phase.
*/
qq_mref_insert(&brick->q_phase2, orig_mref_a);
/* Undo the above pinning
*/
__trans_logger_ref_put(brick, orig_mref_a);
wake_up_interruptible_all(&brick->worker_event);
return;
err: