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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Copyright (C) 2021 Oracle. All Rights Reserved.
* Author: Darrick J. Wong <djwong@kernel.org>
*/
#ifndef __XFS_SCRUB_XFARRAY_H__
#define __XFS_SCRUB_XFARRAY_H__
struct xfarray {
/* Underlying file that backs the array. */
struct xfile *xfile;
/* Number of array elements. */
uint64_t nr;
/* Maximum possible array size. */
uint64_t max_nr;
/* Size of an array element. */
size_t obj_size;
};
int xfarray_create(struct xfs_mount *mp, const char *descr, size_t obj_size,
struct xfarray **arrayp);
void xfarray_destroy(struct xfarray *array);
int xfarray_load(struct xfarray *array, uint64_t idx, void *ptr);
int xfarray_store(struct xfarray *array, uint64_t idx, void *ptr);
int xfarray_store_anywhere(struct xfarray *array, void *ptr);
bool xfarray_is_null(struct xfarray *array, void *ptr);
int xfarray_nullify(struct xfarray *array, uint64_t idx);
void xfarray_truncate(struct xfarray *array);
long long xfarray_bytes(struct xfarray *array);
/*
* Load an array element, but zero the buffer if there's no data because we
* haven't stored to that array element yet.
*/
static inline int
xfarray_load_sparse(
struct xfarray *array,
uint64_t idx,
void *rec)
{
int error = xfarray_load(array, idx, rec);
if (error == -ENODATA) {
memset(rec, 0, array->obj_size);
return 0;
}
return error;
}
/* Append an element to the array. */
static inline int xfarray_append(struct xfarray *array, void *ptr)
{
return xfarray_store(array, array->nr, ptr);
}
uint64_t xfarray_length(struct xfarray *array);
int xfarray_load_next(struct xfarray *array, uint64_t *idx, void *rec);
/*
* Iterate the non-null elements in a sparse xfarray. Callers should
* initialize *idx to zero before the first call; on return, it will be set to
* one more than the index of the record that was retrieved. Returns 1 if a
* record was retrieved, 0 if there weren't any more records, or a negative
* errno.
*/
static inline int
xfarray_iter(
struct xfarray *array,
uint64_t *idx,
void *rec)
{
int ret = xfarray_load_next(array, idx, rec);
if (ret == -ENODATA)
return 0;
if (ret == 0)
return 1;
return ret;
}
typedef int (*xfarray_cmp_fn)(const void *a, const void *b);
int xfarray_sort(struct xfarray *array, xfarray_cmp_fn cmp_fn);
#endif /* __XFS_SCRUB_XFARRAY_H__ */
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