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// SPDX-License-Identifier: GPL-2.0
#include "bcachefs.h"
#include "bkey_buf.h"
#include "bkey_cmp.h"
#include "bkey_sort.h"
#include "bset.h"
#include "extents.h"
typedef int (*sort_cmp_fn)(struct btree *,
struct bkey_packed *,
struct bkey_packed *);
static inline bool sort_iter_end(struct sort_iter *iter)
{
return !iter->used;
}
static inline void sort_iter_sift(struct sort_iter *iter, unsigned from,
sort_cmp_fn cmp)
{
unsigned i;
for (i = from;
i + 1 < iter->used &&
cmp(iter->b, iter->data[i].k, iter->data[i + 1].k) > 0;
i++)
swap(iter->data[i], iter->data[i + 1]);
}
static inline void sort_iter_sort(struct sort_iter *iter, sort_cmp_fn cmp)
{
unsigned i = iter->used;
while (i--)
sort_iter_sift(iter, i, cmp);
}
static inline struct bkey_packed *sort_iter_peek(struct sort_iter *iter)
{
return !sort_iter_end(iter) ? iter->data->k : NULL;
}
static inline void sort_iter_advance(struct sort_iter *iter, sort_cmp_fn cmp)
{
struct sort_iter_set *i = iter->data;
BUG_ON(!iter->used);
i->k = bkey_p_next(i->k);
BUG_ON(i->k > i->end);
if (i->k == i->end)
array_remove_item(iter->data, iter->used, 0);
else
sort_iter_sift(iter, 0, cmp);
}
static inline struct bkey_packed *sort_iter_next(struct sort_iter *iter,
sort_cmp_fn cmp)
{
struct bkey_packed *ret = sort_iter_peek(iter);
if (ret)
sort_iter_advance(iter, cmp);
return ret;
}
/*
* If keys compare equal, compare by pointer order:
*/
static inline int key_sort_fix_overlapping_cmp(struct btree *b,
struct bkey_packed *l,
struct bkey_packed *r)
{
return bch2_bkey_cmp_packed(b, l, r) ?:
cmp_int((unsigned long) l, (unsigned long) r);
}
static inline bool should_drop_next_key(struct sort_iter *iter)
{
/*
* key_sort_cmp() ensures that when keys compare equal the older key
* comes first; so if l->k compares equal to r->k then l->k is older
* and should be dropped.
*/
return iter->used >= 2 &&
!bch2_bkey_cmp_packed(iter->b,
iter->data[0].k,
iter->data[1].k);
}
struct btree_nr_keys
bch2_key_sort_fix_overlapping(struct bch_fs *c, struct bset *dst,
struct sort_iter *iter)
{
struct bkey_packed *out = dst->start;
struct bkey_packed *k;
struct btree_nr_keys nr;
memset(&nr, 0, sizeof(nr));
sort_iter_sort(iter, key_sort_fix_overlapping_cmp);
while ((k = sort_iter_peek(iter))) {
if (!bkey_deleted(k) &&
!should_drop_next_key(iter)) {
bkey_p_copy(out, k);
btree_keys_account_key_add(&nr, 0, out);
out = bkey_p_next(out);
}
sort_iter_advance(iter, key_sort_fix_overlapping_cmp);
}
dst->u64s = cpu_to_le16((u64 *) out - dst->_data);
return nr;
}
/* Sort + repack in a new format: */
struct btree_nr_keys
bch2_sort_repack(struct bset *dst, struct btree *src,
struct btree_node_iter *src_iter,
struct bkey_format *out_f,
bool filter_whiteouts)
{
struct bkey_format *in_f = &src->format;
struct bkey_packed *in, *out = vstruct_last(dst);
struct btree_nr_keys nr;
bool transform = memcmp(out_f, &src->format, sizeof(*out_f));
memset(&nr, 0, sizeof(nr));
while ((in = bch2_btree_node_iter_next_all(src_iter, src))) {
if (filter_whiteouts && bkey_deleted(in))
continue;
if (!transform)
bkey_p_copy(out, in);
else if (bch2_bkey_transform(out_f, out, bkey_packed(in)
? in_f : &bch2_bkey_format_current, in))
out->format = KEY_FORMAT_LOCAL_BTREE;
else
bch2_bkey_unpack(src, (void *) out, in);
out->needs_whiteout = false;
btree_keys_account_key_add(&nr, 0, out);
out = bkey_p_next(out);
}
dst->u64s = cpu_to_le16((u64 *) out - dst->_data);
return nr;
}
static inline int sort_keys_cmp(struct btree *b,
struct bkey_packed *l,
struct bkey_packed *r)
{
return bch2_bkey_cmp_packed_inlined(b, l, r) ?:
(int) bkey_deleted(r) - (int) bkey_deleted(l) ?:
(int) l->needs_whiteout - (int) r->needs_whiteout;
}
unsigned bch2_sort_keys(struct bkey_packed *dst,
struct sort_iter *iter,
bool filter_whiteouts)
{
const struct bkey_format *f = &iter->b->format;
struct bkey_packed *in, *next, *out = dst;
sort_iter_sort(iter, sort_keys_cmp);
while ((in = sort_iter_next(iter, sort_keys_cmp))) {
bool needs_whiteout = false;
if (bkey_deleted(in) &&
(filter_whiteouts || !in->needs_whiteout))
continue;
while ((next = sort_iter_peek(iter)) &&
!bch2_bkey_cmp_packed_inlined(iter->b, in, next)) {
BUG_ON(in->needs_whiteout &&
next->needs_whiteout);
needs_whiteout |= in->needs_whiteout;
in = sort_iter_next(iter, sort_keys_cmp);
}
if (bkey_deleted(in)) {
memcpy_u64s_small(out, in, bkeyp_key_u64s(f, in));
set_bkeyp_val_u64s(f, out, 0);
} else {
bkey_p_copy(out, in);
}
out->needs_whiteout |= needs_whiteout;
out = bkey_p_next(out);
}
return (u64 *) out - (u64 *) dst;
}
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