diff options
Diffstat (limited to 'src/btree/bt_split.c')
| -rw-r--r-- | src/btree/bt_split.c | 32 |
1 files changed, 29 insertions, 3 deletions
diff --git a/src/btree/bt_split.c b/src/btree/bt_split.c index 627e6b9cb48..92be2125b88 100644 --- a/src/btree/bt_split.c +++ b/src/btree/bt_split.c @@ -1256,12 +1256,12 @@ err: switch (complete) { } /* - * __split_internal_lock -- + * __split_internal_lock_worker -- * Lock an internal page. */ static int -__split_internal_lock(WT_SESSION_IMPL *session, WT_REF *ref, bool trylock, - WT_PAGE **parentp, bool *hazardp) +__split_internal_lock_worker(WT_SESSION_IMPL *session, + WT_REF *ref, bool trylock, WT_PAGE **parentp, bool *hazardp) { WT_DECL_RET; WT_PAGE *parent; @@ -1340,6 +1340,32 @@ err: WT_PAGE_UNLOCK(session, parent); } /* + * __split_internal_lock -- + * Lock an internal page. + */ +static int +__split_internal_lock(WT_SESSION_IMPL *session, + WT_REF *ref, bool trylock, WT_PAGE **parentp, bool *hazardp) +{ + WT_DECL_RET; + + /* + * There's no lock on our parent page and we're about to acquire one, + * which implies using the WT_REF.home field to reference our parent + * page. As a child of the parent page, we prevent its eviction, but + * that's a weak guarantee. If the parent page splits, and our WT_REF + * were to move with the split, the WT_REF.home field might change + * underneath us and we could race, and end up attempting to access + * an evicted page. Set the session page-index generation so if the + * parent splits, it still can't be evicted. + */ + WT_WITH_PAGE_INDEX(session, + ret = __split_internal_lock_worker( + session, ref, trylock, parentp, hazardp)); + return (ret); +} + +/* * __split_internal_unlock -- * Unlock the parent page. */ |