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Passing down the original edata on the expand path.

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Instead of passing down the new_addr, pass down the active edata which allows us
to always use a neighbor-acquiring semantic.  In other words, this tells us both
the original edata and neighbor address.  With this change, only neighbors of a
"known" edata can be acquired, i.e. acquiring an edata based on an arbitrary
address isn't possible anymore.
This commit is contained in:
Qi Wang
2021-03-11 00:21:47 -08:00
committed by Qi Wang
parent 1784939688
commit 49b7d7f0a4
6 changed files with 116 additions and 101 deletions
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8
src/pac.c
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@@ -133,9 +133,7 @@ static bool
pac_expand_impl(tsdn_t *tsdn, pai_t *self, edata_t *edata, size_t old_size,
size_t new_size, bool zero) {
pac_t *pac = (pac_t *)self;
ehooks_t *ehooks = pac_ehooks_get(pac);
void *trail_begin = edata_past_get(edata);
size_t mapped_add = 0;
size_t expand_amount = new_size - old_size;
@@ -144,14 +142,14 @@ pac_expand_impl(tsdn_t *tsdn, pai_t *self, edata_t *edata, size_t old_size,
return true;
}
edata_t *trail = ecache_alloc(tsdn, pac, ehooks, &pac->ecache_dirty,
trail_begin, expand_amount, PAGE, zero);
edata, expand_amount, PAGE, zero);
if (trail == NULL) {
trail = ecache_alloc(tsdn, pac, ehooks, &pac->ecache_muzzy,
trail_begin, expand_amount, PAGE, zero);
edata, expand_amount, PAGE, zero);
}
if (trail == NULL) {
trail = ecache_alloc_grow(tsdn, pac, ehooks,
&pac->ecache_retained, trail_begin, expand_amount, PAGE,
&pac->ecache_retained, edata, expand_amount, PAGE,
zero);
mapped_add = expand_amount;
}