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maple_tree: make mas_validate_gaps() to check metadata
Make mas_validate_gaps() check whether the offset in the metadata points to the largest gap. By the way, simplify this function. Add the verification that gaps beyond the node limit are zero. Link: https://lkml.kernel.org/r/20230711035444.526-4-zhangpeng.00@bytedance.com Signed-off-by: Peng Zhang <zhangpeng.00@bytedance.com> Tested-by: Geert Uytterhoeven <geert@linux-m68k.org> Reviewed-by: Liam R. Howlett <Liam.Howlett@oracle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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1 changed files with 41 additions and 35 deletions
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@ -6957,15 +6957,16 @@ EXPORT_SYMBOL_GPL(mt_dump);
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static void mas_validate_gaps(struct ma_state *mas)
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static void mas_validate_gaps(struct ma_state *mas)
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{
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{
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struct maple_enode *mte = mas->node;
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struct maple_enode *mte = mas->node;
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struct maple_node *p_mn;
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struct maple_node *p_mn, *node = mte_to_node(mte);
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enum maple_type mt = mte_node_type(mas->node);
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unsigned long gap = 0, max_gap = 0;
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unsigned long gap = 0, max_gap = 0;
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unsigned long p_end, p_start = mas->min;
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unsigned long p_end, p_start = mas->min;
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unsigned char p_slot;
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unsigned char p_slot, offset;
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unsigned long *gaps = NULL;
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unsigned long *gaps = NULL;
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unsigned long *pivots = ma_pivots(mte_to_node(mte), mte_node_type(mte));
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unsigned long *pivots = ma_pivots(node, mt);
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int i;
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unsigned int i;
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if (ma_is_dense(mte_node_type(mte))) {
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if (ma_is_dense(mt)) {
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for (i = 0; i < mt_slot_count(mte); i++) {
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for (i = 0; i < mt_slot_count(mte); i++) {
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if (mas_get_slot(mas, i)) {
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if (mas_get_slot(mas, i)) {
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if (gap > max_gap)
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if (gap > max_gap)
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@ -6978,52 +6979,59 @@ static void mas_validate_gaps(struct ma_state *mas)
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goto counted;
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goto counted;
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}
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}
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gaps = ma_gaps(mte_to_node(mte), mte_node_type(mte));
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gaps = ma_gaps(node, mt);
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for (i = 0; i < mt_slot_count(mte); i++) {
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for (i = 0; i < mt_slot_count(mte); i++) {
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p_end = mas_logical_pivot(mas, pivots, i, mte_node_type(mte));
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p_end = mas_logical_pivot(mas, pivots, i, mt);
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if (!gaps) {
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if (!gaps) {
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if (mas_get_slot(mas, i)) {
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if (!mas_get_slot(mas, i))
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gap = 0;
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gap = p_end - p_start + 1;
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goto not_empty;
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}
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gap += p_end - p_start + 1;
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} else {
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} else {
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void *entry = mas_get_slot(mas, i);
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void *entry = mas_get_slot(mas, i);
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gap = gaps[i];
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gap = gaps[i];
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if (!entry) {
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MT_BUG_ON(mas->tree, !entry);
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if (gap != p_end - p_start + 1) {
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pr_err("%p[%u] -> %p %lu != %lu - %lu + 1\n",
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mas_mn(mas), i,
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mas_get_slot(mas, i), gap,
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p_end, p_start);
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mt_dump(mas->tree, mt_dump_hex);
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MT_BUG_ON(mas->tree,
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if (gap > p_end - p_start + 1) {
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gap != p_end - p_start + 1);
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pr_err("%p[%u] %lu >= %lu - %lu + 1 (%lu)\n",
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}
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mas_mn(mas), i, gap, p_end, p_start,
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} else {
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p_end - p_start + 1);
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if (gap > p_end - p_start + 1) {
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MT_BUG_ON(mas->tree, gap > p_end - p_start + 1);
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pr_err("%p[%u] %lu >= %lu - %lu + 1 (%lu)\n",
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mas_mn(mas), i, gap, p_end, p_start,
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p_end - p_start + 1);
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MT_BUG_ON(mas->tree,
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gap > p_end - p_start + 1);
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}
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}
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}
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}
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}
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if (gap > max_gap)
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if (gap > max_gap)
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max_gap = gap;
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max_gap = gap;
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not_empty:
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p_start = p_end + 1;
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p_start = p_end + 1;
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if (p_end >= mas->max)
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if (p_end >= mas->max)
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break;
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break;
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}
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}
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counted:
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counted:
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if (mt == maple_arange_64) {
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offset = ma_meta_gap(node, mt);
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if (offset > i) {
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pr_err("gap offset %p[%u] is invalid\n", node, offset);
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MT_BUG_ON(mas->tree, 1);
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}
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if (gaps[offset] != max_gap) {
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pr_err("gap %p[%u] is not the largest gap %lu\n",
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node, offset, max_gap);
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MT_BUG_ON(mas->tree, 1);
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}
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MT_BUG_ON(mas->tree, !gaps);
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for (i++ ; i < mt_slot_count(mte); i++) {
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if (gaps[i] != 0) {
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pr_err("gap %p[%u] beyond node limit != 0\n",
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node, i);
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MT_BUG_ON(mas->tree, 1);
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}
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}
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}
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if (mte_is_root(mte))
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if (mte_is_root(mte))
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return;
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return;
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@ -7033,10 +7041,8 @@ static void mas_validate_gaps(struct ma_state *mas)
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if (ma_gaps(p_mn, mas_parent_type(mas, mte))[p_slot] != max_gap) {
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if (ma_gaps(p_mn, mas_parent_type(mas, mte))[p_slot] != max_gap) {
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pr_err("gap %p[%u] != %lu\n", p_mn, p_slot, max_gap);
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pr_err("gap %p[%u] != %lu\n", p_mn, p_slot, max_gap);
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mt_dump(mas->tree, mt_dump_hex);
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mt_dump(mas->tree, mt_dump_hex);
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MT_BUG_ON(mas->tree, 1);
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}
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}
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MT_BUG_ON(mas->tree,
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ma_gaps(p_mn, mas_parent_type(mas, mte))[p_slot] != max_gap);
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}
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}
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static void mas_validate_parent_slot(struct ma_state *mas)
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static void mas_validate_parent_slot(struct ma_state *mas)
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