![Kent Overstreet](/assets/img/avatar_default.png)
Now, the on disk data structures are in a header that can be exported to userspace - and having them all centralized is nice too. Signed-off-by: Kent Overstreet <kmo@daterainc.com>
799 lines
18 KiB
C
799 lines
18 KiB
C
/*
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* bcache journalling code, for btree insertions
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*
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* Copyright 2012 Google, Inc.
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*/
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#include "bcache.h"
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#include "btree.h"
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#include "debug.h"
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#include <trace/events/bcache.h>
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/*
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* Journal replay/recovery:
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*
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* This code is all driven from run_cache_set(); we first read the journal
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* entries, do some other stuff, then we mark all the keys in the journal
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* entries (same as garbage collection would), then we replay them - reinserting
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* them into the cache in precisely the same order as they appear in the
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* journal.
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*
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* We only journal keys that go in leaf nodes, which simplifies things quite a
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* bit.
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*/
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static void journal_read_endio(struct bio *bio, int error)
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{
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struct closure *cl = bio->bi_private;
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closure_put(cl);
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}
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static int journal_read_bucket(struct cache *ca, struct list_head *list,
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unsigned bucket_index)
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{
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struct journal_device *ja = &ca->journal;
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struct bio *bio = &ja->bio;
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struct journal_replay *i;
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struct jset *j, *data = ca->set->journal.w[0].data;
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struct closure cl;
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unsigned len, left, offset = 0;
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int ret = 0;
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sector_t bucket = bucket_to_sector(ca->set, ca->sb.d[bucket_index]);
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closure_init_stack(&cl);
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pr_debug("reading %llu", (uint64_t) bucket);
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while (offset < ca->sb.bucket_size) {
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reread: left = ca->sb.bucket_size - offset;
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len = min_t(unsigned, left, PAGE_SECTORS * 8);
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bio_reset(bio);
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bio->bi_sector = bucket + offset;
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bio->bi_bdev = ca->bdev;
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bio->bi_rw = READ;
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bio->bi_size = len << 9;
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bio->bi_end_io = journal_read_endio;
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bio->bi_private = &cl;
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bch_bio_map(bio, data);
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closure_bio_submit(bio, &cl, ca);
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closure_sync(&cl);
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/* This function could be simpler now since we no longer write
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* journal entries that overlap bucket boundaries; this means
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* the start of a bucket will always have a valid journal entry
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* if it has any journal entries at all.
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*/
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j = data;
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while (len) {
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struct list_head *where;
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size_t blocks, bytes = set_bytes(j);
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if (j->magic != jset_magic(&ca->sb))
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return ret;
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if (bytes > left << 9)
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return ret;
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if (bytes > len << 9)
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goto reread;
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if (j->csum != csum_set(j))
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return ret;
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blocks = set_blocks(j, ca->set);
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while (!list_empty(list)) {
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i = list_first_entry(list,
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struct journal_replay, list);
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if (i->j.seq >= j->last_seq)
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break;
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list_del(&i->list);
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kfree(i);
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}
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list_for_each_entry_reverse(i, list, list) {
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if (j->seq == i->j.seq)
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goto next_set;
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if (j->seq < i->j.last_seq)
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goto next_set;
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if (j->seq > i->j.seq) {
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where = &i->list;
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goto add;
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}
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}
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where = list;
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add:
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i = kmalloc(offsetof(struct journal_replay, j) +
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bytes, GFP_KERNEL);
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if (!i)
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return -ENOMEM;
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memcpy(&i->j, j, bytes);
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list_add(&i->list, where);
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ret = 1;
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ja->seq[bucket_index] = j->seq;
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next_set:
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offset += blocks * ca->sb.block_size;
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len -= blocks * ca->sb.block_size;
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j = ((void *) j) + blocks * block_bytes(ca);
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}
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}
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return ret;
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}
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int bch_journal_read(struct cache_set *c, struct list_head *list)
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{
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#define read_bucket(b) \
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({ \
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int ret = journal_read_bucket(ca, list, b); \
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__set_bit(b, bitmap); \
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if (ret < 0) \
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return ret; \
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ret; \
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})
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struct cache *ca;
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unsigned iter;
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for_each_cache(ca, c, iter) {
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struct journal_device *ja = &ca->journal;
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unsigned long bitmap[SB_JOURNAL_BUCKETS / BITS_PER_LONG];
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unsigned i, l, r, m;
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uint64_t seq;
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bitmap_zero(bitmap, SB_JOURNAL_BUCKETS);
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pr_debug("%u journal buckets", ca->sb.njournal_buckets);
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/*
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* Read journal buckets ordered by golden ratio hash to quickly
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* find a sequence of buckets with valid journal entries
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*/
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for (i = 0; i < ca->sb.njournal_buckets; i++) {
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l = (i * 2654435769U) % ca->sb.njournal_buckets;
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if (test_bit(l, bitmap))
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break;
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if (read_bucket(l))
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goto bsearch;
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}
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/*
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* If that fails, check all the buckets we haven't checked
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* already
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*/
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pr_debug("falling back to linear search");
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for (l = find_first_zero_bit(bitmap, ca->sb.njournal_buckets);
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l < ca->sb.njournal_buckets;
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l = find_next_zero_bit(bitmap, ca->sb.njournal_buckets, l + 1))
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if (read_bucket(l))
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goto bsearch;
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if (list_empty(list))
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continue;
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bsearch:
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/* Binary search */
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m = r = find_next_bit(bitmap, ca->sb.njournal_buckets, l + 1);
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pr_debug("starting binary search, l %u r %u", l, r);
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while (l + 1 < r) {
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seq = list_entry(list->prev, struct journal_replay,
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list)->j.seq;
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m = (l + r) >> 1;
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read_bucket(m);
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if (seq != list_entry(list->prev, struct journal_replay,
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list)->j.seq)
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l = m;
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else
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r = m;
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}
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/*
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* Read buckets in reverse order until we stop finding more
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* journal entries
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*/
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pr_debug("finishing up: m %u njournal_buckets %u",
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m, ca->sb.njournal_buckets);
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l = m;
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while (1) {
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if (!l--)
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l = ca->sb.njournal_buckets - 1;
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if (l == m)
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break;
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if (test_bit(l, bitmap))
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continue;
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if (!read_bucket(l))
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break;
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}
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seq = 0;
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for (i = 0; i < ca->sb.njournal_buckets; i++)
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if (ja->seq[i] > seq) {
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seq = ja->seq[i];
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ja->cur_idx = ja->discard_idx =
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ja->last_idx = i;
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}
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}
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if (!list_empty(list))
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c->journal.seq = list_entry(list->prev,
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struct journal_replay,
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list)->j.seq;
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return 0;
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#undef read_bucket
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}
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void bch_journal_mark(struct cache_set *c, struct list_head *list)
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{
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atomic_t p = { 0 };
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struct bkey *k;
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struct journal_replay *i;
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struct journal *j = &c->journal;
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uint64_t last = j->seq;
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/*
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* journal.pin should never fill up - we never write a journal
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* entry when it would fill up. But if for some reason it does, we
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* iterate over the list in reverse order so that we can just skip that
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* refcount instead of bugging.
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*/
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list_for_each_entry_reverse(i, list, list) {
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BUG_ON(last < i->j.seq);
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i->pin = NULL;
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while (last-- != i->j.seq)
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if (fifo_free(&j->pin) > 1) {
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fifo_push_front(&j->pin, p);
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atomic_set(&fifo_front(&j->pin), 0);
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}
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if (fifo_free(&j->pin) > 1) {
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fifo_push_front(&j->pin, p);
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i->pin = &fifo_front(&j->pin);
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atomic_set(i->pin, 1);
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}
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for (k = i->j.start;
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k < end(&i->j);
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k = bkey_next(k)) {
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unsigned j;
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for (j = 0; j < KEY_PTRS(k); j++) {
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struct bucket *g = PTR_BUCKET(c, k, j);
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atomic_inc(&g->pin);
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if (g->prio == BTREE_PRIO &&
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!ptr_stale(c, k, j))
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g->prio = INITIAL_PRIO;
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}
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__bch_btree_mark_key(c, 0, k);
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}
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}
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}
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int bch_journal_replay(struct cache_set *s, struct list_head *list)
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{
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int ret = 0, keys = 0, entries = 0;
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struct bkey *k;
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struct journal_replay *i =
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list_entry(list->prev, struct journal_replay, list);
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uint64_t start = i->j.last_seq, end = i->j.seq, n = start;
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struct keylist keylist;
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bch_keylist_init(&keylist);
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list_for_each_entry(i, list, list) {
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BUG_ON(i->pin && atomic_read(i->pin) != 1);
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cache_set_err_on(n != i->j.seq, s,
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"bcache: journal entries %llu-%llu missing! (replaying %llu-%llu)",
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n, i->j.seq - 1, start, end);
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for (k = i->j.start;
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k < end(&i->j);
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k = bkey_next(k)) {
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trace_bcache_journal_replay_key(k);
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bkey_copy(keylist.top, k);
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bch_keylist_push(&keylist);
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ret = bch_btree_insert(s, &keylist, i->pin, NULL);
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if (ret)
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goto err;
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BUG_ON(!bch_keylist_empty(&keylist));
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keys++;
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cond_resched();
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}
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if (i->pin)
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atomic_dec(i->pin);
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n = i->j.seq + 1;
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entries++;
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}
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pr_info("journal replay done, %i keys in %i entries, seq %llu",
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keys, entries, end);
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err:
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while (!list_empty(list)) {
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i = list_first_entry(list, struct journal_replay, list);
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list_del(&i->list);
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kfree(i);
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}
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return ret;
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}
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/* Journalling */
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static void btree_flush_write(struct cache_set *c)
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{
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/*
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* Try to find the btree node with that references the oldest journal
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* entry, best is our current candidate and is locked if non NULL:
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*/
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struct btree *b, *best;
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unsigned i;
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retry:
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best = NULL;
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for_each_cached_btree(b, c, i)
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if (btree_current_write(b)->journal) {
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if (!best)
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best = b;
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else if (journal_pin_cmp(c,
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btree_current_write(best)->journal,
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btree_current_write(b)->journal)) {
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best = b;
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}
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}
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b = best;
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if (b) {
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rw_lock(true, b, b->level);
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if (!btree_current_write(b)->journal) {
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rw_unlock(true, b);
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/* We raced */
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goto retry;
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}
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bch_btree_node_write(b, NULL);
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rw_unlock(true, b);
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}
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}
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#define last_seq(j) ((j)->seq - fifo_used(&(j)->pin) + 1)
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static void journal_discard_endio(struct bio *bio, int error)
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{
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struct journal_device *ja =
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container_of(bio, struct journal_device, discard_bio);
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struct cache *ca = container_of(ja, struct cache, journal);
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atomic_set(&ja->discard_in_flight, DISCARD_DONE);
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closure_wake_up(&ca->set->journal.wait);
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closure_put(&ca->set->cl);
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}
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static void journal_discard_work(struct work_struct *work)
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{
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struct journal_device *ja =
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container_of(work, struct journal_device, discard_work);
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submit_bio(0, &ja->discard_bio);
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}
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static void do_journal_discard(struct cache *ca)
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{
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struct journal_device *ja = &ca->journal;
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struct bio *bio = &ja->discard_bio;
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if (!ca->discard) {
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ja->discard_idx = ja->last_idx;
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return;
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}
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switch (atomic_read(&ja->discard_in_flight)) {
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case DISCARD_IN_FLIGHT:
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return;
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case DISCARD_DONE:
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ja->discard_idx = (ja->discard_idx + 1) %
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ca->sb.njournal_buckets;
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atomic_set(&ja->discard_in_flight, DISCARD_READY);
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/* fallthrough */
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case DISCARD_READY:
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if (ja->discard_idx == ja->last_idx)
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return;
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atomic_set(&ja->discard_in_flight, DISCARD_IN_FLIGHT);
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bio_init(bio);
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bio->bi_sector = bucket_to_sector(ca->set,
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ca->sb.d[ja->discard_idx]);
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bio->bi_bdev = ca->bdev;
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bio->bi_rw = REQ_WRITE|REQ_DISCARD;
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bio->bi_max_vecs = 1;
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bio->bi_io_vec = bio->bi_inline_vecs;
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bio->bi_size = bucket_bytes(ca);
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bio->bi_end_io = journal_discard_endio;
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closure_get(&ca->set->cl);
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INIT_WORK(&ja->discard_work, journal_discard_work);
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schedule_work(&ja->discard_work);
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}
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}
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static void journal_reclaim(struct cache_set *c)
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{
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struct bkey *k = &c->journal.key;
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struct cache *ca;
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uint64_t last_seq;
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unsigned iter, n = 0;
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atomic_t p;
|
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|
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while (!atomic_read(&fifo_front(&c->journal.pin)))
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fifo_pop(&c->journal.pin, p);
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last_seq = last_seq(&c->journal);
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|
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/* Update last_idx */
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for_each_cache(ca, c, iter) {
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struct journal_device *ja = &ca->journal;
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|
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while (ja->last_idx != ja->cur_idx &&
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ja->seq[ja->last_idx] < last_seq)
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ja->last_idx = (ja->last_idx + 1) %
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ca->sb.njournal_buckets;
|
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}
|
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|
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for_each_cache(ca, c, iter)
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do_journal_discard(ca);
|
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|
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if (c->journal.blocks_free)
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goto out;
|
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|
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/*
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* Allocate:
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* XXX: Sort by free journal space
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*/
|
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|
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for_each_cache(ca, c, iter) {
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struct journal_device *ja = &ca->journal;
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unsigned next = (ja->cur_idx + 1) % ca->sb.njournal_buckets;
|
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|
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/* No space available on this device */
|
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if (next == ja->discard_idx)
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continue;
|
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|
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ja->cur_idx = next;
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k->ptr[n++] = PTR(0,
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bucket_to_sector(c, ca->sb.d[ja->cur_idx]),
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ca->sb.nr_this_dev);
|
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}
|
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|
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bkey_init(k);
|
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SET_KEY_PTRS(k, n);
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|
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if (n)
|
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c->journal.blocks_free = c->sb.bucket_size >> c->block_bits;
|
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out:
|
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if (!journal_full(&c->journal))
|
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__closure_wake_up(&c->journal.wait);
|
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}
|
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|
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void bch_journal_next(struct journal *j)
|
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{
|
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atomic_t p = { 1 };
|
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|
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j->cur = (j->cur == j->w)
|
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? &j->w[1]
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: &j->w[0];
|
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|
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/*
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* The fifo_push() needs to happen at the same time as j->seq is
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* incremented for last_seq() to be calculated correctly
|
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*/
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BUG_ON(!fifo_push(&j->pin, p));
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atomic_set(&fifo_back(&j->pin), 1);
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|
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j->cur->data->seq = ++j->seq;
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j->cur->need_write = false;
|
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j->cur->data->keys = 0;
|
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|
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if (fifo_full(&j->pin))
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pr_debug("journal_pin full (%zu)", fifo_used(&j->pin));
|
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}
|
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|
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static void journal_write_endio(struct bio *bio, int error)
|
|
{
|
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struct journal_write *w = bio->bi_private;
|
|
|
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cache_set_err_on(error, w->c, "journal io error");
|
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closure_put(&w->c->journal.io);
|
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}
|
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|
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static void journal_write(struct closure *);
|
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|
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static void journal_write_done(struct closure *cl)
|
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{
|
|
struct journal *j = container_of(cl, struct journal, io);
|
|
struct journal_write *w = (j->cur == j->w)
|
|
? &j->w[1]
|
|
: &j->w[0];
|
|
|
|
__closure_wake_up(&w->wait);
|
|
continue_at_nobarrier(cl, journal_write, system_wq);
|
|
}
|
|
|
|
static void journal_write_unlocked(struct closure *cl)
|
|
__releases(c->journal.lock)
|
|
{
|
|
struct cache_set *c = container_of(cl, struct cache_set, journal.io);
|
|
struct cache *ca;
|
|
struct journal_write *w = c->journal.cur;
|
|
struct bkey *k = &c->journal.key;
|
|
unsigned i, sectors = set_blocks(w->data, c) * c->sb.block_size;
|
|
|
|
struct bio *bio;
|
|
struct bio_list list;
|
|
bio_list_init(&list);
|
|
|
|
if (!w->need_write) {
|
|
/*
|
|
* XXX: have to unlock closure before we unlock journal lock,
|
|
* else we race with bch_journal(). But this way we race
|
|
* against cache set unregister. Doh.
|
|
*/
|
|
set_closure_fn(cl, NULL, NULL);
|
|
closure_sub(cl, CLOSURE_RUNNING + 1);
|
|
spin_unlock(&c->journal.lock);
|
|
return;
|
|
} else if (journal_full(&c->journal)) {
|
|
journal_reclaim(c);
|
|
spin_unlock(&c->journal.lock);
|
|
|
|
btree_flush_write(c);
|
|
continue_at(cl, journal_write, system_wq);
|
|
}
|
|
|
|
c->journal.blocks_free -= set_blocks(w->data, c);
|
|
|
|
w->data->btree_level = c->root->level;
|
|
|
|
bkey_copy(&w->data->btree_root, &c->root->key);
|
|
bkey_copy(&w->data->uuid_bucket, &c->uuid_bucket);
|
|
|
|
for_each_cache(ca, c, i)
|
|
w->data->prio_bucket[ca->sb.nr_this_dev] = ca->prio_buckets[0];
|
|
|
|
w->data->magic = jset_magic(&c->sb);
|
|
w->data->version = BCACHE_JSET_VERSION;
|
|
w->data->last_seq = last_seq(&c->journal);
|
|
w->data->csum = csum_set(w->data);
|
|
|
|
for (i = 0; i < KEY_PTRS(k); i++) {
|
|
ca = PTR_CACHE(c, k, i);
|
|
bio = &ca->journal.bio;
|
|
|
|
atomic_long_add(sectors, &ca->meta_sectors_written);
|
|
|
|
bio_reset(bio);
|
|
bio->bi_sector = PTR_OFFSET(k, i);
|
|
bio->bi_bdev = ca->bdev;
|
|
bio->bi_rw = REQ_WRITE|REQ_SYNC|REQ_META|REQ_FLUSH|REQ_FUA;
|
|
bio->bi_size = sectors << 9;
|
|
|
|
bio->bi_end_io = journal_write_endio;
|
|
bio->bi_private = w;
|
|
bch_bio_map(bio, w->data);
|
|
|
|
trace_bcache_journal_write(bio);
|
|
bio_list_add(&list, bio);
|
|
|
|
SET_PTR_OFFSET(k, i, PTR_OFFSET(k, i) + sectors);
|
|
|
|
ca->journal.seq[ca->journal.cur_idx] = w->data->seq;
|
|
}
|
|
|
|
atomic_dec_bug(&fifo_back(&c->journal.pin));
|
|
bch_journal_next(&c->journal);
|
|
journal_reclaim(c);
|
|
|
|
spin_unlock(&c->journal.lock);
|
|
|
|
while ((bio = bio_list_pop(&list)))
|
|
closure_bio_submit(bio, cl, c->cache[0]);
|
|
|
|
continue_at(cl, journal_write_done, NULL);
|
|
}
|
|
|
|
static void journal_write(struct closure *cl)
|
|
{
|
|
struct cache_set *c = container_of(cl, struct cache_set, journal.io);
|
|
|
|
spin_lock(&c->journal.lock);
|
|
journal_write_unlocked(cl);
|
|
}
|
|
|
|
static void journal_try_write(struct cache_set *c)
|
|
__releases(c->journal.lock)
|
|
{
|
|
struct closure *cl = &c->journal.io;
|
|
struct journal_write *w = c->journal.cur;
|
|
|
|
w->need_write = true;
|
|
|
|
if (closure_trylock(cl, &c->cl))
|
|
journal_write_unlocked(cl);
|
|
else
|
|
spin_unlock(&c->journal.lock);
|
|
}
|
|
|
|
static struct journal_write *journal_wait_for_write(struct cache_set *c,
|
|
unsigned nkeys)
|
|
{
|
|
size_t sectors;
|
|
struct closure cl;
|
|
|
|
closure_init_stack(&cl);
|
|
|
|
spin_lock(&c->journal.lock);
|
|
|
|
while (1) {
|
|
struct journal_write *w = c->journal.cur;
|
|
|
|
sectors = __set_blocks(w->data, w->data->keys + nkeys,
|
|
c) * c->sb.block_size;
|
|
|
|
if (sectors <= min_t(size_t,
|
|
c->journal.blocks_free * c->sb.block_size,
|
|
PAGE_SECTORS << JSET_BITS))
|
|
return w;
|
|
|
|
/* XXX: tracepoint */
|
|
if (!journal_full(&c->journal)) {
|
|
trace_bcache_journal_entry_full(c);
|
|
|
|
/*
|
|
* XXX: If we were inserting so many keys that they
|
|
* won't fit in an _empty_ journal write, we'll
|
|
* deadlock. For now, handle this in
|
|
* bch_keylist_realloc() - but something to think about.
|
|
*/
|
|
BUG_ON(!w->data->keys);
|
|
|
|
closure_wait(&w->wait, &cl);
|
|
journal_try_write(c); /* unlocks */
|
|
} else {
|
|
trace_bcache_journal_full(c);
|
|
|
|
closure_wait(&c->journal.wait, &cl);
|
|
journal_reclaim(c);
|
|
spin_unlock(&c->journal.lock);
|
|
|
|
btree_flush_write(c);
|
|
}
|
|
|
|
closure_sync(&cl);
|
|
spin_lock(&c->journal.lock);
|
|
}
|
|
}
|
|
|
|
static void journal_write_work(struct work_struct *work)
|
|
{
|
|
struct cache_set *c = container_of(to_delayed_work(work),
|
|
struct cache_set,
|
|
journal.work);
|
|
spin_lock(&c->journal.lock);
|
|
journal_try_write(c);
|
|
}
|
|
|
|
/*
|
|
* Entry point to the journalling code - bio_insert() and btree_invalidate()
|
|
* pass bch_journal() a list of keys to be journalled, and then
|
|
* bch_journal() hands those same keys off to btree_insert_async()
|
|
*/
|
|
|
|
atomic_t *bch_journal(struct cache_set *c,
|
|
struct keylist *keys,
|
|
struct closure *parent)
|
|
{
|
|
struct journal_write *w;
|
|
atomic_t *ret;
|
|
|
|
if (!CACHE_SYNC(&c->sb))
|
|
return NULL;
|
|
|
|
w = journal_wait_for_write(c, bch_keylist_nkeys(keys));
|
|
|
|
memcpy(end(w->data), keys->keys, bch_keylist_bytes(keys));
|
|
w->data->keys += bch_keylist_nkeys(keys);
|
|
|
|
ret = &fifo_back(&c->journal.pin);
|
|
atomic_inc(ret);
|
|
|
|
if (parent) {
|
|
closure_wait(&w->wait, parent);
|
|
journal_try_write(c);
|
|
} else if (!w->need_write) {
|
|
schedule_delayed_work(&c->journal.work,
|
|
msecs_to_jiffies(c->journal_delay_ms));
|
|
spin_unlock(&c->journal.lock);
|
|
} else {
|
|
spin_unlock(&c->journal.lock);
|
|
}
|
|
|
|
|
|
return ret;
|
|
}
|
|
|
|
void bch_journal_meta(struct cache_set *c, struct closure *cl)
|
|
{
|
|
struct keylist keys;
|
|
atomic_t *ref;
|
|
|
|
bch_keylist_init(&keys);
|
|
|
|
ref = bch_journal(c, &keys, cl);
|
|
if (ref)
|
|
atomic_dec_bug(ref);
|
|
}
|
|
|
|
void bch_journal_free(struct cache_set *c)
|
|
{
|
|
free_pages((unsigned long) c->journal.w[1].data, JSET_BITS);
|
|
free_pages((unsigned long) c->journal.w[0].data, JSET_BITS);
|
|
free_fifo(&c->journal.pin);
|
|
}
|
|
|
|
int bch_journal_alloc(struct cache_set *c)
|
|
{
|
|
struct journal *j = &c->journal;
|
|
|
|
closure_init_unlocked(&j->io);
|
|
spin_lock_init(&j->lock);
|
|
INIT_DELAYED_WORK(&j->work, journal_write_work);
|
|
|
|
c->journal_delay_ms = 100;
|
|
|
|
j->w[0].c = c;
|
|
j->w[1].c = c;
|
|
|
|
if (!(init_fifo(&j->pin, JOURNAL_PIN, GFP_KERNEL)) ||
|
|
!(j->w[0].data = (void *) __get_free_pages(GFP_KERNEL, JSET_BITS)) ||
|
|
!(j->w[1].data = (void *) __get_free_pages(GFP_KERNEL, JSET_BITS)))
|
|
return -ENOMEM;
|
|
|
|
return 0;
|
|
}
|