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maple_tree: add gap support, slot and pivot sizes for maple copy

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Add plumbing work for using maple copy as a normal node for a source of
copy operations.  This is needed later.

Link: https://lkml.kernel.org/r/20260130205935.2559335-17-Liam.Howlett@oracle.com
Signed-off-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Cc: Alice Ryhl <aliceryhl@google.com>
Cc: Andrew Ballance <andrewjballance@gmail.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Christian Kujau <lists@nerdbynature.de>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: SeongJae Park <sj@kernel.org>
Cc: Sidhartha Kumar <sidhartha.kumar@oracle.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Liam R. Howlett 2026-01-30 15:59:21 -05:00 committed by Andrew Morton
parent de7f3ed37c
commit 20b20162e1
2 changed files with 6 additions and 0 deletions
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1
include/linux/maple_tree.h
View File

@ -165,6 +165,7 @@ struct maple_copy {
} src[4];
/* Simulated node */
void __rcu *slot[3];
unsigned long gap[3];
unsigned long min;
union {
unsigned long pivot[3];

5
lib/maple_tree.c
View File

@ -101,6 +101,7 @@ static const unsigned long mt_max[] = {
[maple_leaf_64] = ULONG_MAX,
[maple_range_64] = ULONG_MAX,
[maple_arange_64] = ULONG_MAX,
[maple_copy] = ULONG_MAX,
};
#define mt_node_max(x) mt_max[mte_node_type(x)]
#endif
@ -110,6 +111,7 @@ static const unsigned char mt_slots[] = {
[maple_leaf_64] = MAPLE_RANGE64_SLOTS,
[maple_range_64] = MAPLE_RANGE64_SLOTS,
[maple_arange_64] = MAPLE_ARANGE64_SLOTS,
[maple_copy] = 3,
};
#define mt_slot_count(x) mt_slots[mte_node_type(x)]
@ -118,6 +120,7 @@ static const unsigned char mt_pivots[] = {
[maple_leaf_64] = MAPLE_RANGE64_SLOTS - 1,
[maple_range_64] = MAPLE_RANGE64_SLOTS - 1,
[maple_arange_64] = MAPLE_ARANGE64_SLOTS - 1,
[maple_copy] = 3,
};
#define mt_pivot_count(x) mt_pivots[mte_node_type(x)]
@ -126,6 +129,7 @@ static const unsigned char mt_min_slots[] = {
[maple_leaf_64] = (MAPLE_RANGE64_SLOTS / 2) - 2,
[maple_range_64] = (MAPLE_RANGE64_SLOTS / 2) - 2,
[maple_arange_64] = (MAPLE_ARANGE64_SLOTS / 2) - 1,
[maple_copy] = 1, /* Should never be used */
};
#define mt_min_slot_count(x) mt_min_slots[mte_node_type(x)]
@ -627,6 +631,7 @@ static inline unsigned long *ma_gaps(struct maple_node *node,
case maple_arange_64:
return node->ma64.gap;
case maple_copy:
return node->cp.gap;
case maple_range_64:
case maple_leaf_64:
case maple_dense: