+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0
-
-#include "bcachefs.h"
-#include "bset.h"
-#include "btree_journal_iter.h"
-#include "journal_io.h"
-
-#include <linux/sort.h>
-
-/*
- * For managing keys we read from the journal: until journal replay works normal
- * btree lookups need to be able to find and return keys from the journal where
- * they overwrite what's in the btree, so we have a special iterator and
- * operations for the regular btree iter code to use:
- */
-
-static int __journal_key_cmp(enum btree_id l_btree_id,
- unsigned l_level,
- struct bpos l_pos,
- const struct journal_key *r)
-{
- return (cmp_int(l_btree_id, r->btree_id) ?:
- cmp_int(l_level, r->level) ?:
- bpos_cmp(l_pos, r->k->k.p));
-}
-
-static int journal_key_cmp(const struct journal_key *l, const struct journal_key *r)
-{
- return __journal_key_cmp(l->btree_id, l->level, l->k->k.p, r);
-}
-
-static inline size_t idx_to_pos(struct journal_keys *keys, size_t idx)
-{
- size_t gap_size = keys->size - keys->nr;
-
- if (idx >= keys->gap)
- idx += gap_size;
- return idx;
-}
-
-static inline struct journal_key *idx_to_key(struct journal_keys *keys, size_t idx)
-{
- return keys->d + idx_to_pos(keys, idx);
-}
-
-static size_t __bch2_journal_key_search(struct journal_keys *keys,
- enum btree_id id, unsigned level,
- struct bpos pos)
-{
- size_t l = 0, r = keys->nr, m;
-
- while (l < r) {
- m = l + ((r - l) >> 1);
- if (__journal_key_cmp(id, level, pos, idx_to_key(keys, m)) > 0)
- l = m + 1;
- else
- r = m;
- }
-
- BUG_ON(l < keys->nr &&
- __journal_key_cmp(id, level, pos, idx_to_key(keys, l)) > 0);
-
- BUG_ON(l &&
- __journal_key_cmp(id, level, pos, idx_to_key(keys, l - 1)) <= 0);
-
- return l;
-}
-
-static size_t bch2_journal_key_search(struct journal_keys *keys,
- enum btree_id id, unsigned level,
- struct bpos pos)
-{
- return idx_to_pos(keys, __bch2_journal_key_search(keys, id, level, pos));
-}
-
-/* Returns first non-overwritten key >= search key: */
-struct bkey_i *bch2_journal_keys_peek_upto(struct bch_fs *c, enum btree_id btree_id,
- unsigned level, struct bpos pos,
- struct bpos end_pos, size_t *idx)
-{
- struct journal_keys *keys = &c->journal_keys;
- unsigned iters = 0;
- struct journal_key *k;
-
- BUG_ON(*idx > keys->nr);
-search:
- if (!*idx)
- *idx = __bch2_journal_key_search(keys, btree_id, level, pos);
-
- while (*idx &&
- __journal_key_cmp(btree_id, level, end_pos, idx_to_key(keys, *idx - 1)) <= 0) {
- --(*idx);
- iters++;
- if (iters == 10) {
- *idx = 0;
- goto search;
- }
- }
-
- while ((k = *idx < keys->nr ? idx_to_key(keys, *idx) : NULL)) {
- if (__journal_key_cmp(btree_id, level, end_pos, k) < 0)
- return NULL;
-
- if (k->overwritten) {
- (*idx)++;
- continue;
- }
-
- if (__journal_key_cmp(btree_id, level, pos, k) <= 0)
- return k->k;
-
- (*idx)++;
- iters++;
- if (iters == 10) {
- *idx = 0;
- goto search;
- }
- }
-
- return NULL;
-}
-
-struct bkey_i *bch2_journal_keys_peek_slot(struct bch_fs *c, enum btree_id btree_id,
- unsigned level, struct bpos pos)
-{
- size_t idx = 0;
-
- return bch2_journal_keys_peek_upto(c, btree_id, level, pos, pos, &idx);
-}
-
-static void journal_iters_fix(struct bch_fs *c)
-{
- struct journal_keys *keys = &c->journal_keys;
- /* The key we just inserted is immediately before the gap: */
- size_t gap_end = keys->gap + (keys->size - keys->nr);
- struct btree_and_journal_iter *iter;
-
- /*
- * If an iterator points one after the key we just inserted, decrement
- * the iterator so it points at the key we just inserted - if the
- * decrement was unnecessary, bch2_btree_and_journal_iter_peek() will
- * handle that:
- */
- list_for_each_entry(iter, &c->journal_iters, journal.list)
- if (iter->journal.idx == gap_end)
- iter->journal.idx = keys->gap - 1;
-}
-
-static void journal_iters_move_gap(struct bch_fs *c, size_t old_gap, size_t new_gap)
-{
- struct journal_keys *keys = &c->journal_keys;
- struct journal_iter *iter;
- size_t gap_size = keys->size - keys->nr;
-
- list_for_each_entry(iter, &c->journal_iters, list) {
- if (iter->idx > old_gap)
- iter->idx -= gap_size;
- if (iter->idx >= new_gap)
- iter->idx += gap_size;
- }
-}
-
-int bch2_journal_key_insert_take(struct bch_fs *c, enum btree_id id,
- unsigned level, struct bkey_i *k)
-{
- struct journal_key n = {
- .btree_id = id,
- .level = level,
- .k = k,
- .allocated = true,
- /*
- * Ensure these keys are done last by journal replay, to unblock
- * journal reclaim:
- */
- .journal_seq = U32_MAX,
- };
- struct journal_keys *keys = &c->journal_keys;
- size_t idx = bch2_journal_key_search(keys, id, level, k->k.p);
-
- BUG_ON(test_bit(BCH_FS_rw, &c->flags));
-
- if (idx < keys->size &&
- journal_key_cmp(&n, &keys->d[idx]) == 0) {
- if (keys->d[idx].allocated)
- kfree(keys->d[idx].k);
- keys->d[idx] = n;
- return 0;
- }
-
- if (idx > keys->gap)
- idx -= keys->size - keys->nr;
-
- if (keys->nr == keys->size) {
- struct journal_keys new_keys = {
- .nr = keys->nr,
- .size = max_t(size_t, keys->size, 8) * 2,
- };
-
- new_keys.d = kvmalloc_array(new_keys.size, sizeof(new_keys.d[0]), GFP_KERNEL);
- if (!new_keys.d) {
- bch_err(c, "%s: error allocating new key array (size %zu)",
- __func__, new_keys.size);
- return -BCH_ERR_ENOMEM_journal_key_insert;
- }
-
- /* Since @keys was full, there was no gap: */
- memcpy(new_keys.d, keys->d, sizeof(keys->d[0]) * keys->nr);
- kvfree(keys->d);
- keys->d = new_keys.d;
- keys->nr = new_keys.nr;
- keys->size = new_keys.size;
-
- /* And now the gap is at the end: */
- keys->gap = keys->nr;
- }
-
- journal_iters_move_gap(c, keys->gap, idx);
-
- move_gap(keys->d, keys->nr, keys->size, keys->gap, idx);
- keys->gap = idx;
-
- keys->nr++;
- keys->d[keys->gap++] = n;
-
- journal_iters_fix(c);
-
- return 0;
-}
-
-/*
- * Can only be used from the recovery thread while we're still RO - can't be
- * used once we've got RW, as journal_keys is at that point used by multiple
- * threads:
- */
-int bch2_journal_key_insert(struct bch_fs *c, enum btree_id id,
- unsigned level, struct bkey_i *k)
-{
- struct bkey_i *n;
- int ret;
-
- n = kmalloc(bkey_bytes(&k->k), GFP_KERNEL);
- if (!n)
- return -BCH_ERR_ENOMEM_journal_key_insert;
-
- bkey_copy(n, k);
- ret = bch2_journal_key_insert_take(c, id, level, n);
- if (ret)
- kfree(n);
- return ret;
-}
-
-int bch2_journal_key_delete(struct bch_fs *c, enum btree_id id,
- unsigned level, struct bpos pos)
-{
- struct bkey_i whiteout;
-
- bkey_init(&whiteout.k);
- whiteout.k.p = pos;
-
- return bch2_journal_key_insert(c, id, level, &whiteout);
-}
-
-void bch2_journal_key_overwritten(struct bch_fs *c, enum btree_id btree,
- unsigned level, struct bpos pos)
-{
- struct journal_keys *keys = &c->journal_keys;
- size_t idx = bch2_journal_key_search(keys, btree, level, pos);
-
- if (idx < keys->size &&
- keys->d[idx].btree_id == btree &&
- keys->d[idx].level == level &&
- bpos_eq(keys->d[idx].k->k.p, pos))
- keys->d[idx].overwritten = true;
-}
-
-static void bch2_journal_iter_advance(struct journal_iter *iter)
-{
- if (iter->idx < iter->keys->size) {
- iter->idx++;
- if (iter->idx == iter->keys->gap)
- iter->idx += iter->keys->size - iter->keys->nr;
- }
-}
-
-static struct bkey_s_c bch2_journal_iter_peek(struct journal_iter *iter)
-{
- struct journal_key *k = iter->keys->d + iter->idx;
-
- while (k < iter->keys->d + iter->keys->size &&
- k->btree_id == iter->btree_id &&
- k->level == iter->level) {
- if (!k->overwritten)
- return bkey_i_to_s_c(k->k);
-
- bch2_journal_iter_advance(iter);
- k = iter->keys->d + iter->idx;
- }
-
- return bkey_s_c_null;
-}
-
-static void bch2_journal_iter_exit(struct journal_iter *iter)
-{
- list_del(&iter->list);
-}
-
-static void bch2_journal_iter_init(struct bch_fs *c,
- struct journal_iter *iter,
- enum btree_id id, unsigned level,
- struct bpos pos)
-{
- iter->btree_id = id;
- iter->level = level;
- iter->keys = &c->journal_keys;
- iter->idx = bch2_journal_key_search(&c->journal_keys, id, level, pos);
-}
-
-static struct bkey_s_c bch2_journal_iter_peek_btree(struct btree_and_journal_iter *iter)
-{
- return bch2_btree_node_iter_peek_unpack(&iter->node_iter,
- iter->b, &iter->unpacked);
-}
-
-static void bch2_journal_iter_advance_btree(struct btree_and_journal_iter *iter)
-{
- bch2_btree_node_iter_advance(&iter->node_iter, iter->b);
-}
-
-void bch2_btree_and_journal_iter_advance(struct btree_and_journal_iter *iter)
-{
- if (bpos_eq(iter->pos, SPOS_MAX))
- iter->at_end = true;
- else
- iter->pos = bpos_successor(iter->pos);
-}
-
-struct bkey_s_c bch2_btree_and_journal_iter_peek(struct btree_and_journal_iter *iter)
-{
- struct bkey_s_c btree_k, journal_k, ret;
-again:
- if (iter->at_end)
- return bkey_s_c_null;
-
- while ((btree_k = bch2_journal_iter_peek_btree(iter)).k &&
- bpos_lt(btree_k.k->p, iter->pos))
- bch2_journal_iter_advance_btree(iter);
-
- while ((journal_k = bch2_journal_iter_peek(&iter->journal)).k &&
- bpos_lt(journal_k.k->p, iter->pos))
- bch2_journal_iter_advance(&iter->journal);
-
- ret = journal_k.k &&
- (!btree_k.k || bpos_le(journal_k.k->p, btree_k.k->p))
- ? journal_k
- : btree_k;
-
- if (ret.k && iter->b && bpos_gt(ret.k->p, iter->b->data->max_key))
- ret = bkey_s_c_null;
-
- if (ret.k) {
- iter->pos = ret.k->p;
- if (bkey_deleted(ret.k)) {
- bch2_btree_and_journal_iter_advance(iter);
- goto again;
- }
- } else {
- iter->pos = SPOS_MAX;
- iter->at_end = true;
- }
-
- return ret;
-}
-
-void bch2_btree_and_journal_iter_exit(struct btree_and_journal_iter *iter)
-{
- bch2_journal_iter_exit(&iter->journal);
-}
-
-void __bch2_btree_and_journal_iter_init_node_iter(struct btree_and_journal_iter *iter,
- struct bch_fs *c,
- struct btree *b,
- struct btree_node_iter node_iter,
- struct bpos pos)
-{
- memset(iter, 0, sizeof(*iter));
-
- iter->b = b;
- iter->node_iter = node_iter;
- bch2_journal_iter_init(c, &iter->journal, b->c.btree_id, b->c.level, pos);
- INIT_LIST_HEAD(&iter->journal.list);
- iter->pos = b->data->min_key;
- iter->at_end = false;
-}
-
-/*
- * this version is used by btree_gc before filesystem has gone RW and
- * multithreaded, so uses the journal_iters list:
- */
-void bch2_btree_and_journal_iter_init_node_iter(struct btree_and_journal_iter *iter,
- struct bch_fs *c,
- struct btree *b)
-{
- struct btree_node_iter node_iter;
-
- bch2_btree_node_iter_init_from_start(&node_iter, b);
- __bch2_btree_and_journal_iter_init_node_iter(iter, c, b, node_iter, b->data->min_key);
- list_add(&iter->journal.list, &c->journal_iters);
-}
-
-/* sort and dedup all keys in the journal: */
-
-void bch2_journal_entries_free(struct bch_fs *c)
-{
- struct journal_replay **i;
- struct genradix_iter iter;
-
- genradix_for_each(&c->journal_entries, iter, i)
- if (*i)
- kvpfree(*i, offsetof(struct journal_replay, j) +
- vstruct_bytes(&(*i)->j));
- genradix_free(&c->journal_entries);
-}
-
-/*
- * When keys compare equal, oldest compares first:
- */
-static int journal_sort_key_cmp(const void *_l, const void *_r)
-{
- const struct journal_key *l = _l;
- const struct journal_key *r = _r;
-
- return journal_key_cmp(l, r) ?:
- cmp_int(l->journal_seq, r->journal_seq) ?:
- cmp_int(l->journal_offset, r->journal_offset);
-}
-
-void bch2_journal_keys_put(struct bch_fs *c)
-{
- struct journal_keys *keys = &c->journal_keys;
- struct journal_key *i;
-
- BUG_ON(atomic_read(&keys->ref) <= 0);
-
- if (!atomic_dec_and_test(&keys->ref))
- return;
-
- move_gap(keys->d, keys->nr, keys->size, keys->gap, keys->nr);
- keys->gap = keys->nr;
-
- for (i = keys->d; i < keys->d + keys->nr; i++)
- if (i->allocated)
- kfree(i->k);
-
- kvfree(keys->d);
- keys->d = NULL;
- keys->nr = keys->gap = keys->size = 0;
-
- bch2_journal_entries_free(c);
-}
-
-static void __journal_keys_sort(struct journal_keys *keys)
-{
- struct journal_key *src, *dst;
-
- sort(keys->d, keys->nr, sizeof(keys->d[0]), journal_sort_key_cmp, NULL);
-
- src = dst = keys->d;
- while (src < keys->d + keys->nr) {
- while (src + 1 < keys->d + keys->nr &&
- !journal_key_cmp(src, src + 1))
- src++;
-
- *dst++ = *src++;
- }
-
- keys->nr = dst - keys->d;
-}
-
-int bch2_journal_keys_sort(struct bch_fs *c)
-{
- struct genradix_iter iter;
- struct journal_replay *i, **_i;
- struct jset_entry *entry;
- struct bkey_i *k;
- struct journal_keys *keys = &c->journal_keys;
- size_t nr_keys = 0, nr_read = 0;
-
- genradix_for_each(&c->journal_entries, iter, _i) {
- i = *_i;
-
- if (!i || i->ignore)
- continue;
-
- for_each_jset_key(k, entry, &i->j)
- nr_keys++;
- }
-
- if (!nr_keys)
- return 0;
-
- keys->size = roundup_pow_of_two(nr_keys);
-
- keys->d = kvmalloc_array(keys->size, sizeof(keys->d[0]), GFP_KERNEL);
- if (!keys->d) {
- bch_err(c, "Failed to allocate buffer for sorted journal keys (%zu keys); trying slowpath",
- nr_keys);
-
- do {
- keys->size >>= 1;
- keys->d = kvmalloc_array(keys->size, sizeof(keys->d[0]), GFP_KERNEL);
- } while (!keys->d && keys->size > nr_keys / 8);
-
- if (!keys->d) {
- bch_err(c, "Failed to allocate %zu size buffer for sorted journal keys; exiting",
- keys->size);
- return -BCH_ERR_ENOMEM_journal_keys_sort;
- }
- }
-
- genradix_for_each(&c->journal_entries, iter, _i) {
- i = *_i;
-
- if (!i || i->ignore)
- continue;
-
- cond_resched();
-
- for_each_jset_key(k, entry, &i->j) {
- if (keys->nr == keys->size) {
- __journal_keys_sort(keys);
-
- if (keys->nr > keys->size * 7 / 8) {
- bch_err(c, "Too many journal keys for slowpath; have %zu compacted, buf size %zu, processed %zu/%zu",
- keys->nr, keys->size, nr_read, nr_keys);
- return -BCH_ERR_ENOMEM_journal_keys_sort;
- }
- }
-
- keys->d[keys->nr++] = (struct journal_key) {
- .btree_id = entry->btree_id,
- .level = entry->level,
- .k = k,
- .journal_seq = le64_to_cpu(i->j.seq),
- .journal_offset = k->_data - i->j._data,
- };
-
- nr_read++;
- }
- }
-
- __journal_keys_sort(keys);
- keys->gap = keys->nr;
-
- bch_verbose(c, "Journal keys: %zu read, %zu after sorting and compacting", nr_keys, keys->nr);
- return 0;
-}
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