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maple_tree: Add mtree_alloc_cyclic()

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I need a cyclic allocator for the simple_offset implementation in
fs/libfs.c.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Link: https://lore.kernel.org/r/170820144179.6328.12838600511394432325.stgit@91.116.238.104.host.secureserver.net
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Chuck Lever
2024-02-17 15:24:01 -05:00
committed by Christian Brauner
parent ecba88a3b3
commit 9b6713cc75
2 changed files with 100 additions and 0 deletions
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include/linux/maple_tree.h
+7
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@@ -171,6 +171,7 @@ enum maple_type {
#define MT_FLAGS_LOCK_IRQ 0x100
#define MT_FLAGS_LOCK_BH 0x200
#define MT_FLAGS_LOCK_EXTERN 0x300
#define MT_FLAGS_ALLOC_WRAPPED 0x0800
#define MAPLE_HEIGHT_MAX 31
@@ -319,6 +320,9 @@ int mtree_insert_range(struct maple_tree *mt, unsigned long first,
int mtree_alloc_range(struct maple_tree *mt, unsigned long *startp,
void *entry, unsigned long size, unsigned long min,
unsigned long max, gfp_t gfp);
int mtree_alloc_cyclic(struct maple_tree *mt, unsigned long *startp,
void *entry, unsigned long range_lo, unsigned long range_hi,
unsigned long *next, gfp_t gfp);
int mtree_alloc_rrange(struct maple_tree *mt, unsigned long *startp,
void *entry, unsigned long size, unsigned long min,
unsigned long max, gfp_t gfp);
@@ -499,6 +503,9 @@ void *mas_find_range(struct ma_state *mas, unsigned long max);
void *mas_find_rev(struct ma_state *mas, unsigned long min);
void *mas_find_range_rev(struct ma_state *mas, unsigned long max);
int mas_preallocate(struct ma_state *mas, void *entry, gfp_t gfp);
int mas_alloc_cyclic(struct ma_state *mas, unsigned long *startp,
void *entry, unsigned long range_lo, unsigned long range_hi,
unsigned long *next, gfp_t gfp);
bool mas_nomem(struct ma_state *mas, gfp_t gfp);
void mas_pause(struct ma_state *mas);