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Merge pull request #226 from urbit/barter-simsum/pma-record-node-partitions-in-flist-on-restore

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pma: fix memory corruption restoration bug
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barter-simsum 2024-04-19 13:37:32 -04:00 committed by GitHub
commit 34c4d036bd
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2 changed files with 22 additions and 4 deletions
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2
rust/ares_pma/c-src/btest.c
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@ -318,7 +318,7 @@ int main(int argc, char *argv[])
assert(SUCC(bt_state_open(state4, "./pmatest4", 0, 0644)));
assert(state4->file_size_p == PMA_INITIAL_SIZE_p + PMA_GROW_SIZE_p * 2);
assert(state4->flist->next->hi == state4->file_size_p);
assert(state4->flist->hi == state4->file_size_p);
for (size_t i = 0; i < PMA_GROW_SIZE_b * 2; i++)
assert(t4a_copy[i] == t4a[i]);

24
rust/ares_pma/c-src/btree.c
View File

@ -1689,7 +1689,6 @@ _flist_grow(BT_state *state, size_t pages)
static int
_flist_new(BT_state *state, size_t size_p)
#define FLIST_PG_START (BT_META_SECTION_WIDTH / BT_PAGESIZE)
/* #define FLIST_PG_START ((BT_META_SECTION_WIDTH + BLK_BASE_LEN0_b) / BT_PAGESIZE) */
{
BT_flistnode *head = calloc(1, sizeof *head);
head->next = 0;
@ -2407,6 +2406,22 @@ _freelist_restore2(BT_state *state, BT_page *node,
}
}
static void
_flist_restore_partitions(BT_state *state)
{
BT_meta *meta = state->meta_pages[state->which];
assert(meta->blk_base[0] == BT_NUMMETAS);
for (size_t i = 0
; i < BT_NUMPARTS && meta->blk_base[i] != 0
; i++) {
pgno_t partoff_p = meta->blk_base[i];
size_t partlen_p = BLK_BASE_LENS_b[i] / BT_PAGESIZE;
_flist_record_alloc(state, partoff_p, partoff_p + partlen_p);
}
}
static void
_freelist_restore(BT_state *state)
/* restores the mlist, nlist, and mlist */
@ -2416,7 +2431,11 @@ _freelist_restore(BT_state *state)
assert(SUCC(_flist_new(state, state->file_size_p)));
assert(SUCC(_nlist_load(state)));
assert(SUCC(_mlist_new(state)));
/* first record root's allocation */
/* record node partitions in flist */
_flist_restore_partitions(state);
/* record root's allocation and then handle subtree */
_nlist_record_alloc(state, root);
_freelist_restore2(state, root, 1, meta->depth);
}
@ -2515,7 +2534,6 @@ _bt_state_load(BT_state *state)
/* map the node segment */
_bt_state_map_node_segment(state);
/* new db, so populate metadata */
if (new) {
assert(SUCC(_flist_new(state, PMA_GROW_SIZE_p)));
assert(SUCC(_nlist_new(state)));