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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2018 Oracle. All Rights Reserved.
* Author: Darrick J. Wong <darrick.wong@oracle.com>
*/
#ifndef __XFS_SCRUB_BITMAP_H__
#define __XFS_SCRUB_BITMAP_H__
struct xbitmap {
struct rb_root_cached xb_root;
};
void xbitmap_init(struct xbitmap *bitmap);
void xbitmap_destroy(struct xbitmap *bitmap);
int xbitmap_clear(struct xbitmap *bitmap, uint64_t start, uint64_t len);
int xbitmap_set(struct xbitmap *bitmap, uint64_t start, uint64_t len);
int xbitmap_disunion(struct xbitmap *bitmap, struct xbitmap *sub);
int xbitmap_set_btcur_path(struct xbitmap *bitmap,
struct xfs_btree_cur *cur);
int xbitmap_set_btblocks(struct xbitmap *bitmap,
struct xfs_btree_cur *cur);
uint64_t xbitmap_hweight(struct xbitmap *bitmap);
/*
* Return codes for the bitmap iterator functions are 0 to continue iterating,
* and non-zero to stop iterating. Any non-zero value will be passed up to the
* iteration caller. The special value -ECANCELED can be used to stop
* iteration, because neither bitmap iterator ever generates that error code on
* its own. Callers must not modify the bitmap while walking it.
*/
typedef int (*xbitmap_walk_fn)(uint64_t start, uint64_t len, void *priv);
int xbitmap_walk(struct xbitmap *bitmap, xbitmap_walk_fn fn,
void *priv);
bool xbitmap_empty(struct xbitmap *bitmap);
bool xbitmap_test(struct xbitmap *bitmap, uint64_t start, uint64_t *len);
/* Bitmaps, but for type-checked for xfs_agblock_t */
struct xagb_bitmap {
struct xbitmap agbitmap;
};
static inline void xagb_bitmap_init(struct xagb_bitmap *bitmap)
{
xbitmap_init(&bitmap->agbitmap);
}
static inline void xagb_bitmap_destroy(struct xagb_bitmap *bitmap)
{
xbitmap_destroy(&bitmap->agbitmap);
}
static inline int xagb_bitmap_clear(struct xagb_bitmap *bitmap,
xfs_agblock_t start, xfs_extlen_t len)
{
return xbitmap_clear(&bitmap->agbitmap, start, len);
}
static inline int xagb_bitmap_set(struct xagb_bitmap *bitmap,
xfs_agblock_t start, xfs_extlen_t len)
{
return xbitmap_set(&bitmap->agbitmap, start, len);
}
static inline bool xagb_bitmap_test(struct xagb_bitmap *bitmap,
xfs_agblock_t start, xfs_extlen_t *len)
{
uint64_t biglen = *len;
int error;
error = xbitmap_test(&bitmap->agbitmap, start, &biglen);
if (error)
return error;
if (biglen >= UINT_MAX) {
ASSERT(0);
return -EOVERFLOW;
}
*len = biglen;
return 0;
}
static inline int xagb_bitmap_disunion(struct xagb_bitmap *bitmap,
struct xagb_bitmap *sub)
{
return xbitmap_disunion(&bitmap->agbitmap, &sub->agbitmap);
}
static inline uint32_t xagb_bitmap_hweight(struct xagb_bitmap *bitmap)
{
return xbitmap_hweight(&bitmap->agbitmap);
}
static inline bool xagb_bitmap_empty(struct xagb_bitmap *bitmap)
{
return xbitmap_empty(&bitmap->agbitmap);
}
static inline int xagb_bitmap_walk(struct xagb_bitmap *bitmap,
xbitmap_walk_fn fn, void *priv)
{
return xbitmap_walk(&bitmap->agbitmap, fn, priv);
}
int xagb_bitmap_set_btblocks(struct xagb_bitmap *bitmap,
struct xfs_btree_cur *cur);
#endif /* __XFS_SCRUB_BITMAP_H__ */
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