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maple_tree: don't use MAPLE_ARANGE64_META_MAX to indicate no gap 

Patch series "Improve the validation for maple tree and some cleanup", v2.


This patch (of 7):

Do not use a special offset to indicate that there is no gap.  When there
is no gap, offset can point to any valid slots because its gap is 0.

Link: https://lkml.kernel.org/r/20230711035444.526-1-zhangpeng.00@bytedance.com
Link: https://lkml.kernel.org/r/20230711035444.526-3-zhangpeng.00@bytedance.com
Signed-off-by: Peng Zhang <zhangpeng.00@bytedance.com>
Reviewed-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Tested-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Peng Zhang 2023-07-11 11:54:38 +08:00 committed by Andrew Morton
parent 86aa6998ad
commit d695c30a8c
2 changed files with 2 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
include/linux/maple_tree.h
View File

@ -29,14 +29,12 @@
#define MAPLE_NODE_SLOTS 31 /* 256 bytes including ->parent */
#define MAPLE_RANGE64_SLOTS 16 /* 256 bytes */
#define MAPLE_ARANGE64_SLOTS 10 /* 240 bytes */
#define MAPLE_ARANGE64_META_MAX 15 /* Out of range for metadata */
#define MAPLE_ALLOC_SLOTS (MAPLE_NODE_SLOTS - 1)
#else
/* 32bit sizes */
#define MAPLE_NODE_SLOTS 63 /* 256 bytes including ->parent */
#define MAPLE_RANGE64_SLOTS 32 /* 256 bytes */
#define MAPLE_ARANGE64_SLOTS 21 /* 240 bytes */
#define MAPLE_ARANGE64_META_MAX 31 /* Out of range for metadata */
#define MAPLE_ALLOC_SLOTS (MAPLE_NODE_SLOTS - 2)
#endif /* defined(CONFIG_64BIT) || defined(BUILD_VDSO32_64) */

13
lib/maple_tree.c
View File

@ -1610,8 +1610,6 @@ ma_max_gap(struct maple_node *node, unsigned long *gaps, enum maple_type mt,
* mas_max_gap() - find the largest gap in a non-leaf node and set the slot.
* @mas: The maple state.
*
* If the metadata gap is set to MAPLE_ARANGE64_META_MAX, there is no gap.
*
* Return: The gap value.
*/
static inline unsigned long mas_max_gap(struct ma_state *mas)
@ -1628,9 +1626,6 @@ static inline unsigned long mas_max_gap(struct ma_state *mas)
node = mas_mn(mas);
MAS_BUG_ON(mas, mt != maple_arange_64);
offset = ma_meta_gap(node, mt);
if (offset == MAPLE_ARANGE64_META_MAX)
return 0;
gaps = ma_gaps(node, mt);
return gaps[offset];
}
@ -1662,10 +1657,7 @@ static inline void mas_parent_gap(struct ma_state *mas, unsigned char offset,
ascend:
MAS_BUG_ON(mas, pmt != maple_arange_64);
meta_offset = ma_meta_gap(pnode, pmt);
if (meta_offset == MAPLE_ARANGE64_META_MAX)
meta_gap = 0;
else
meta_gap = pgaps[meta_offset];
meta_gap = pgaps[meta_offset];
pgaps[offset] = new;
@ -1678,7 +1670,6 @@ ascend:
ma_set_meta_gap(pnode, pmt, offset);
} else if (new < meta_gap) {
meta_offset = 15;
new = ma_max_gap(pnode, pgaps, pmt, &meta_offset);
ma_set_meta_gap(pnode, pmt, meta_offset);
}
@ -2076,7 +2067,7 @@ static inline void mab_mas_cp(struct maple_big_node *b_node,
end = j - 1;
if (likely(!ma_is_leaf(mt) && mt_is_alloc(mas->tree))) {
unsigned long max_gap = 0;
unsigned char offset = 15;
unsigned char offset = 0;
gaps = ma_gaps(node, mt);
do {