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btrfs-progs: kernel-lib: add rbtree_types.h from linux

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In order to use rb_root_cached we need to sync with kernel sources. Copy
the file from linux.git/include/linux/rbtree_types.h and update so it's
C++ protected for inclusion to libbtrfs and remove duplicate
definitions.

Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2022-05-12 12:32:18 +02:00
parent df77a231bb
commit c1b24d742f
3 changed files with 46 additions and 14 deletions
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2
Makefile
View File

@ -213,7 +213,7 @@ libbtrfs_objects = \
crypto/crc32c.o
libbtrfs_headers = libbtrfs/send-stream.h libbtrfs/send-utils.h kernel-shared/send.h kernel-lib/rbtree.h \
kernel-lib/list.h kerncompat.h \
kernel-lib/list.h kernel-lib/rbtree_types.h kerncompat.h \
common/extent-cache.h kernel-shared/extent_io.h ioctl.h \
kernel-shared/ctree.h version.h
libbtrfsutil_major := $(shell sed -rn 's/^\#define BTRFS_UTIL_VERSION_MAJOR ([0-9])+$$/\1/p' libbtrfsutil/btrfsutil.h)

16
kernel-lib/rbtree.h
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@ -28,31 +28,21 @@
#ifndef _LINUX_RBTREE_H
#define _LINUX_RBTREE_H
#if BTRFS_FLAT_INCLUDES
#include "kerncompat.h"
#include "kernel-lib/rbtree_types.h"
#else
#include <btrfs/kerncompat.h>
#include <btrfs/rbtree_types.h>
#endif /* BTRFS_FLAT_INCLUDES */
#ifdef __cplusplus
extern "C" {
#endif
struct rb_node {
unsigned long __rb_parent_color;
struct rb_node *rb_right;
struct rb_node *rb_left;
} __attribute__((aligned(sizeof(long))));
/* The alignment might seem pointless, but allegedly CRIS needs it */
struct rb_root {
struct rb_node *rb_node;
};
#define rb_parent(r) ((struct rb_node *)((r)->__rb_parent_color & ~3))
#define RB_ROOT (struct rb_root) { NULL, }
#define rb_entry(ptr, type, member) container_of(ptr, type, member)
#define RB_EMPTY_ROOT(root) ((root)->rb_node == NULL)

42
kernel-lib/rbtree_types.h Normal file
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@ -0,0 +1,42 @@
/* SPDX-License-Identifier: GPL-2.0-or-later */
#ifndef _LINUX_RBTREE_TYPES_H
#define _LINUX_RBTREE_TYPES_H
#ifdef __cplusplus
extern "C" {
#endif
struct rb_node {
unsigned long __rb_parent_color;
struct rb_node *rb_right;
struct rb_node *rb_left;
} __attribute__((aligned(sizeof(long))));
/* The alignment might seem pointless, but allegedly CRIS needs it */
struct rb_root {
struct rb_node *rb_node;
};
/*
* Leftmost-cached rbtrees.
*
* We do not cache the rightmost node based on footprint
* size vs number of potential users that could benefit
* from O(1) rb_last(). Just not worth it, users that want
* this feature can always implement the logic explicitly.
* Furthermore, users that want to cache both pointers may
* find it a bit asymmetric, but that's ok.
*/
struct rb_root_cached {
struct rb_root rb_root;
struct rb_node *rb_leftmost;
};
#define RB_ROOT (struct rb_root) { NULL, }
#define RB_ROOT_CACHED (struct rb_root_cached) { {NULL, }, NULL }
#ifdef __cplusplus
}
#endif
#endif