diff options
Diffstat (limited to 'fs/bcachefs/alloc_foreground.c')
| -rw-r--r-- | fs/bcachefs/alloc_foreground.c | 1576 |
1 files changed, 1576 insertions, 0 deletions
diff --git a/fs/bcachefs/alloc_foreground.c b/fs/bcachefs/alloc_foreground.c new file mode 100644 index 000000000000..3bc4abd3d7d5 --- /dev/null +++ b/fs/bcachefs/alloc_foreground.c @@ -0,0 +1,1576 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright 2012 Google, Inc. + * + * Foreground allocator code: allocate buckets from freelist, and allocate in + * sector granularity from writepoints. + * + * bch2_bucket_alloc() allocates a single bucket from a specific device. + * + * bch2_bucket_alloc_set() allocates one or more buckets from different devices + * in a given filesystem. + */ + +#include "bcachefs.h" +#include "alloc_background.h" +#include "alloc_foreground.h" +#include "backpointers.h" +#include "btree_iter.h" +#include "btree_update.h" +#include "btree_gc.h" +#include "buckets.h" +#include "buckets_waiting_for_journal.h" +#include "clock.h" +#include "debug.h" +#include "disk_groups.h" +#include "ec.h" +#include "error.h" +#include "io_write.h" +#include "journal.h" +#include "movinggc.h" +#include "nocow_locking.h" +#include "trace.h" + +#include <linux/math64.h> +#include <linux/rculist.h> +#include <linux/rcupdate.h> + +static void bch2_trans_mutex_lock_norelock(struct btree_trans *trans, + struct mutex *lock) +{ + if (!mutex_trylock(lock)) { + bch2_trans_unlock(trans); + mutex_lock(lock); + } +} + +const char * const bch2_watermarks[] = { +#define x(t) #t, + BCH_WATERMARKS() +#undef x + NULL +}; + +/* + * Open buckets represent a bucket that's currently being allocated from. They + * serve two purposes: + * + * - They track buckets that have been partially allocated, allowing for + * sub-bucket sized allocations - they're used by the sector allocator below + * + * - They provide a reference to the buckets they own that mark and sweep GC + * can find, until the new allocation has a pointer to it inserted into the + * btree + * + * When allocating some space with the sector allocator, the allocation comes + * with a reference to an open bucket - the caller is required to put that + * reference _after_ doing the index update that makes its allocation reachable. + */ + +void bch2_reset_alloc_cursors(struct bch_fs *c) +{ + struct bch_dev *ca; + unsigned i; + + rcu_read_lock(); + for_each_member_device_rcu(ca, c, i, NULL) + ca->alloc_cursor = 0; + rcu_read_unlock(); +} + +static void bch2_open_bucket_hash_add(struct bch_fs *c, struct open_bucket *ob) +{ + open_bucket_idx_t idx = ob - c->open_buckets; + open_bucket_idx_t *slot = open_bucket_hashslot(c, ob->dev, ob->bucket); + + ob->hash = *slot; + *slot = idx; +} + +static void bch2_open_bucket_hash_remove(struct bch_fs *c, struct open_bucket *ob) +{ + open_bucket_idx_t idx = ob - c->open_buckets; + open_bucket_idx_t *slot = open_bucket_hashslot(c, ob->dev, ob->bucket); + + while (*slot != idx) { + BUG_ON(!*slot); + slot = &c->open_buckets[*slot].hash; + } + + *slot = ob->hash; + ob->hash = 0; +} + +void __bch2_open_bucket_put(struct bch_fs *c, struct open_bucket *ob) +{ + struct bch_dev *ca = bch_dev_bkey_exists(c, ob->dev); + + if (ob->ec) { + ec_stripe_new_put(c, ob->ec, STRIPE_REF_io); + return; + } + + percpu_down_read(&c->mark_lock); + spin_lock(&ob->lock); + + ob->valid = false; + ob->data_type = 0; + + spin_unlock(&ob->lock); + percpu_up_read(&c->mark_lock); + + spin_lock(&c->freelist_lock); + bch2_open_bucket_hash_remove(c, ob); + + ob->freelist = c->open_buckets_freelist; + c->open_buckets_freelist = ob - c->open_buckets; + + c->open_buckets_nr_free++; + ca->nr_open_buckets--; + spin_unlock(&c->freelist_lock); + + closure_wake_up(&c->open_buckets_wait); +} + +void bch2_open_bucket_write_error(struct bch_fs *c, + struct open_buckets *obs, + unsigned dev) +{ + struct open_bucket *ob; + unsigned i; + + open_bucket_for_each(c, obs, ob, i) + if (ob->dev == dev && ob->ec) + bch2_ec_bucket_cancel(c, ob); +} + +static struct open_bucket *bch2_open_bucket_alloc(struct bch_fs *c) +{ + struct open_bucket *ob; + + BUG_ON(!c->open_buckets_freelist || !c->open_buckets_nr_free); + + ob = c->open_buckets + c->open_buckets_freelist; + c->open_buckets_freelist = ob->freelist; + atomic_set(&ob->pin, 1); + ob->data_type = 0; + + c->open_buckets_nr_free--; + return ob; +} + +static void open_bucket_free_unused(struct bch_fs *c, struct open_bucket *ob) +{ + BUG_ON(c->open_buckets_partial_nr >= + ARRAY_SIZE(c->open_buckets_partial)); + + spin_lock(&c->freelist_lock); + ob->on_partial_list = true; + c->open_buckets_partial[c->open_buckets_partial_nr++] = + ob - c->open_buckets; + spin_unlock(&c->freelist_lock); + + closure_wake_up(&c->open_buckets_wait); + closure_wake_up(&c->freelist_wait); +} + +/* _only_ for allocating the journal on a new device: */ +long bch2_bucket_alloc_new_fs(struct bch_dev *ca) +{ + while (ca->new_fs_bucket_idx < ca->mi.nbuckets) { + u64 b = ca->new_fs_bucket_idx++; + + if (!is_superblock_bucket(ca, b) && + (!ca->buckets_nouse || !test_bit(b, ca->buckets_nouse))) + return b; + } + + return -1; +} + +static inline unsigned open_buckets_reserved(enum bch_watermark watermark) +{ + switch (watermark) { + case BCH_WATERMARK_reclaim: + return 0; + case BCH_WATERMARK_btree: + case BCH_WATERMARK_btree_copygc: + return OPEN_BUCKETS_COUNT / 4; + case BCH_WATERMARK_copygc: + return OPEN_BUCKETS_COUNT / 3; + default: + return OPEN_BUCKETS_COUNT / 2; + } +} + +static struct open_bucket *__try_alloc_bucket(struct bch_fs *c, struct bch_dev *ca, + u64 bucket, + enum bch_watermark watermark, + const struct bch_alloc_v4 *a, + struct bucket_alloc_state *s, + struct closure *cl) +{ + struct open_bucket *ob; + + if (unlikely(ca->buckets_nouse && test_bit(bucket, ca->buckets_nouse))) { + s->skipped_nouse++; + return NULL; + } + + if (bch2_bucket_is_open(c, ca->dev_idx, bucket)) { + s->skipped_open++; + return NULL; + } + + if (bch2_bucket_needs_journal_commit(&c->buckets_waiting_for_journal, + c->journal.flushed_seq_ondisk, ca->dev_idx, bucket)) { + s->skipped_need_journal_commit++; + return NULL; + } + + if (bch2_bucket_nocow_is_locked(&c->nocow_locks, POS(ca->dev_idx, bucket))) { + s->skipped_nocow++; + return NULL; + } + + spin_lock(&c->freelist_lock); + + if (unlikely(c->open_buckets_nr_free <= open_buckets_reserved(watermark))) { + if (cl) + closure_wait(&c->open_buckets_wait, cl); + + if (!c->blocked_allocate_open_bucket) + c->blocked_allocate_open_bucket = local_clock(); + + spin_unlock(&c->freelist_lock); + return ERR_PTR(-BCH_ERR_open_buckets_empty); + } + + /* Recheck under lock: */ + if (bch2_bucket_is_open(c, ca->dev_idx, bucket)) { + spin_unlock(&c->freelist_lock); + s->skipped_open++; + return NULL; + } + + ob = bch2_open_bucket_alloc(c); + + spin_lock(&ob->lock); + + ob->valid = true; + ob->sectors_free = ca->mi.bucket_size; + ob->dev = ca->dev_idx; + ob->gen = a->gen; + ob->bucket = bucket; + spin_unlock(&ob->lock); + + ca->nr_open_buckets++; + bch2_open_bucket_hash_add(c, ob); + + if (c->blocked_allocate_open_bucket) { + bch2_time_stats_update( + &c->times[BCH_TIME_blocked_allocate_open_bucket], + c->blocked_allocate_open_bucket); + c->blocked_allocate_open_bucket = 0; + } + + if (c->blocked_allocate) { + bch2_time_stats_update( + &c->times[BCH_TIME_blocked_allocate], + c->blocked_allocate); + c->blocked_allocate = 0; + } + + spin_unlock(&c->freelist_lock); + return ob; +} + +static struct open_bucket *try_alloc_bucket(struct btree_trans *trans, struct bch_dev *ca, + enum bch_watermark watermark, u64 free_entry, + struct bucket_alloc_state *s, + struct bkey_s_c freespace_k, + struct closure *cl) +{ + struct bch_fs *c = trans->c; + struct btree_iter iter = { NULL }; + struct bkey_s_c k; + struct open_bucket *ob; + struct bch_alloc_v4 a_convert; + const struct bch_alloc_v4 *a; + u64 b = free_entry & ~(~0ULL << 56); + unsigned genbits = free_entry >> 56; + struct printbuf buf = PRINTBUF; + int ret; + + if (b < ca->mi.first_bucket || b >= ca->mi.nbuckets) { + prt_printf(&buf, "freespace btree has bucket outside allowed range %u-%llu\n" + " freespace key ", + ca->mi.first_bucket, ca->mi.nbuckets); + bch2_bkey_val_to_text(&buf, c, freespace_k); + bch2_trans_inconsistent(trans, "%s", buf.buf); + ob = ERR_PTR(-EIO); + goto err; + } + + k = bch2_bkey_get_iter(trans, &iter, + BTREE_ID_alloc, POS(ca->dev_idx, b), + BTREE_ITER_CACHED); + ret = bkey_err(k); + if (ret) { + ob = ERR_PTR(ret); + goto err; + } + + a = bch2_alloc_to_v4(k, &a_convert); + + if (a->data_type != BCH_DATA_free) { + if (c->curr_recovery_pass <= BCH_RECOVERY_PASS_check_alloc_info) { + ob = NULL; + goto err; + } + + prt_printf(&buf, "non free bucket in freespace btree\n" + " freespace key "); + bch2_bkey_val_to_text(&buf, c, freespace_k); + prt_printf(&buf, "\n "); + bch2_bkey_val_to_text(&buf, c, k); + bch2_trans_inconsistent(trans, "%s", buf.buf); + ob = ERR_PTR(-EIO); + goto err; + } + + if (genbits != (alloc_freespace_genbits(*a) >> 56) && + c->curr_recovery_pass > BCH_RECOVERY_PASS_check_alloc_info) { + prt_printf(&buf, "bucket in freespace btree with wrong genbits (got %u should be %llu)\n" + " freespace key ", + genbits, alloc_freespace_genbits(*a) >> 56); + bch2_bkey_val_to_text(&buf, c, freespace_k); + prt_printf(&buf, "\n "); + bch2_bkey_val_to_text(&buf, c, k); + bch2_trans_inconsistent(trans, "%s", buf.buf); + ob = ERR_PTR(-EIO); + goto err; + } + + if (c->curr_recovery_pass <= BCH_RECOVERY_PASS_check_extents_to_backpointers) { + struct bch_backpointer bp; + struct bpos bp_pos = POS_MIN; + + ret = bch2_get_next_backpointer(trans, POS(ca->dev_idx, b), -1, + &bp_pos, &bp, + BTREE_ITER_NOPRESERVE); + if (ret) { + ob = ERR_PTR(ret); + goto err; + } + + if (!bkey_eq(bp_pos, POS_MAX)) { + /* + * Bucket may have data in it - we don't call + * bc2h_trans_inconnsistent() because fsck hasn't + * finished yet + */ + ob = NULL; + goto err; + } + } + + ob = __try_alloc_bucket(c, ca, b, watermark, a, s, cl); + if (!ob) + iter.path->preserve = false; +err: + if (iter.trans && iter.path) + set_btree_iter_dontneed(&iter); + bch2_trans_iter_exit(trans, &iter); + printbuf_exit(&buf); + return ob; +} + +/* + * This path is for before the freespace btree is initialized: + * + * If ca->new_fs_bucket_idx is nonzero, we haven't yet marked superblock & + * journal buckets - journal buckets will be < ca->new_fs_bucket_idx + */ +static noinline struct open_bucket * +bch2_bucket_alloc_early(struct btree_trans *trans, + struct bch_dev *ca, + enum bch_watermark watermark, + struct bucket_alloc_state *s, + struct closure *cl) +{ + struct btree_iter iter; + struct bkey_s_c k; + struct open_bucket *ob = NULL; + u64 alloc_start = max_t(u64, ca->mi.first_bucket, ca->new_fs_bucket_idx); + u64 alloc_cursor = max(alloc_start, READ_ONCE(ca->alloc_cursor)); + int ret; +again: + for_each_btree_key_norestart(trans, iter, BTREE_ID_alloc, POS(ca->dev_idx, alloc_cursor), + BTREE_ITER_SLOTS, k, ret) { + struct bch_alloc_v4 a_convert; + const struct bch_alloc_v4 *a; + + if (bkey_ge(k.k->p, POS(ca->dev_idx, ca->mi.nbuckets))) + break; + + if (ca->new_fs_bucket_idx && + is_superblock_bucket(ca, k.k->p.offset)) + continue; + + a = bch2_alloc_to_v4(k, &a_convert); + + if (a->data_type != BCH_DATA_free) + continue; + + s->buckets_seen++; + + ob = __try_alloc_bucket(trans->c, ca, k.k->p.offset, watermark, a, s, cl); + if (ob) + break; + } + bch2_trans_iter_exit(trans, &iter); + + ca->alloc_cursor = alloc_cursor; + + if (!ob && ret) + ob = ERR_PTR(ret); + + if (!ob && alloc_cursor > alloc_start) { + alloc_cursor = alloc_start; + goto again; + } + + return ob; +} + +static struct open_bucket *bch2_bucket_alloc_freelist(struct btree_trans *trans, + struct bch_dev *ca, + enum bch_watermark watermark, + struct bucket_alloc_state *s, + struct closure *cl) +{ + struct btree_iter iter; + struct bkey_s_c k; + struct open_bucket *ob = NULL; + u64 alloc_start = max_t(u64, ca->mi.first_bucket, READ_ONCE(ca->alloc_cursor)); + u64 alloc_cursor = alloc_start; + int ret; + + BUG_ON(ca->new_fs_bucket_idx); +again: + for_each_btree_key_norestart(trans, iter, BTREE_ID_freespace, + POS(ca->dev_idx, alloc_cursor), 0, k, ret) { + if (k.k->p.inode != ca->dev_idx) + break; + + for (alloc_cursor = max(alloc_cursor, bkey_start_offset(k.k)); + alloc_cursor < k.k->p.offset; + alloc_cursor++) { + ret = btree_trans_too_many_iters(trans); + if (ret) { + ob = ERR_PTR(ret); + break; + } + + s->buckets_seen++; + + ob = try_alloc_bucket(trans, ca, watermark, + alloc_cursor, s, k, cl); + if (ob) { + iter.path->preserve = false; + break; + } + } + + if (ob || ret) + break; + } + bch2_trans_iter_exit(trans, &iter); + + ca->alloc_cursor = alloc_cursor; + + if (!ob && ret) + ob = ERR_PTR(ret); + + if (!ob && alloc_start > ca->mi.first_bucket) { + alloc_cursor = alloc_start = ca->mi.first_bucket; + goto again; + } + + return ob; +} + +/** + * bch2_bucket_alloc_trans - allocate a single bucket from a specific device + * @trans: transaction object + * @ca: device to allocate from + * @watermark: how important is this allocation? + * @cl: if not NULL, closure to be used to wait if buckets not available + * @usage: for secondarily also returning the current device usage + * + * Returns: an open_bucket on success, or an ERR_PTR() on failure. + */ +static struct open_bucket *bch2_bucket_alloc_trans(struct btree_trans *trans, + struct bch_dev *ca, + enum bch_watermark watermark, + struct closure *cl, + struct bch_dev_usage *usage) +{ + struct bch_fs *c = trans->c; + struct open_bucket *ob = NULL; + bool freespace = READ_ONCE(ca->mi.freespace_initialized); + u64 avail; + struct bucket_alloc_state s = { 0 }; + bool waiting = false; +again: + bch2_dev_usage_read_fast(ca, usage); + avail = dev_buckets_free(ca, *usage, watermark); + + if (usage->d[BCH_DATA_need_discard].buckets > avail) + bch2_do_discards(c); + + if (usage->d[BCH_DATA_need_gc_gens].buckets > avail) + bch2_do_gc_gens(c); + + if (should_invalidate_buckets(ca, *usage)) + bch2_do_invalidates(c); + + if (!avail) { + if (cl && !waiting) { + closure_wait(&c->freelist_wait, cl); + waiting = true; + goto again; + } + + if (!c->blocked_allocate) + c->blocked_allocate = local_clock(); + + ob = ERR_PTR(-BCH_ERR_freelist_empty); + goto err; + } + + if (waiting) + closure_wake_up(&c->freelist_wait); +alloc: + ob = likely(freespace) + ? bch2_bucket_alloc_freelist(trans, ca, watermark, &s, cl) + : bch2_bucket_alloc_early(trans, ca, watermark, &s, cl); + + if (s.skipped_need_journal_commit * 2 > avail) + bch2_journal_flush_async(&c->journal, NULL); + + if (!ob && freespace && c->curr_recovery_pass <= BCH_RECOVERY_PASS_check_alloc_info) { + freespace = false; + goto alloc; + } +err: + if (!ob) + ob = ERR_PTR(-BCH_ERR_no_buckets_found); + + if (!IS_ERR(ob)) + trace_and_count(c, bucket_alloc, ca, + bch2_watermarks[watermark], + ob->bucket, + usage->d[BCH_DATA_free].buckets, + avail, + bch2_copygc_wait_amount(c), + c->copygc_wait - atomic64_read(&c->io_clock[WRITE].now), + &s, + cl == NULL, + ""); + else if (!bch2_err_matches(PTR_ERR(ob), BCH_ERR_transaction_restart)) + trace_and_count(c, bucket_alloc_fail, ca, + bch2_watermarks[watermark], + 0, + usage->d[BCH_DATA_free].buckets, + avail, + bch2_copygc_wait_amount(c), + c->copygc_wait - atomic64_read(&c->io_clock[WRITE].now), + &s, + cl == NULL, + bch2_err_str(PTR_ERR(ob))); + + return ob; +} + +struct open_bucket *bch2_bucket_alloc(struct bch_fs *c, struct bch_dev *ca, + enum bch_watermark watermark, + struct closure *cl) +{ + struct bch_dev_usage usage; + struct open_bucket *ob; + + bch2_trans_do(c, NULL, NULL, 0, + PTR_ERR_OR_ZERO(ob = bch2_bucket_alloc_trans(trans, ca, watermark, + cl, &usage))); + return ob; +} + +static int __dev_stripe_cmp(struct dev_stripe_state *stripe, + unsigned l, unsigned r) +{ + return ((stripe->next_alloc[l] > stripe->next_alloc[r]) - + (stripe->next_alloc[l] < stripe->next_alloc[r])); +} + +#define dev_stripe_cmp(l, r) __dev_stripe_cmp(stripe, l, r) + +struct dev_alloc_list bch2_dev_alloc_list(struct bch_fs *c, + struct dev_stripe_state *stripe, + struct bch_devs_mask *devs) +{ + struct dev_alloc_list ret = { .nr = 0 }; + unsigned i; + + for_each_set_bit(i, devs->d, BCH_SB_MEMBERS_MAX) + ret.devs[ret.nr++] = i; + + bubble_sort(ret.devs, ret.nr, dev_stripe_cmp); + return ret; +} + +static inline void bch2_dev_stripe_increment_inlined(struct bch_dev *ca, + struct dev_stripe_state *stripe, + struct bch_dev_usage *usage) +{ + u64 *v = stripe->next_alloc + ca->dev_idx; + u64 free_space = dev_buckets_available(ca, BCH_WATERMARK_normal); + u64 free_space_inv = free_space + ? div64_u64(1ULL << 48, free_space) + : 1ULL << 48; + u64 scale = *v / 4; + + if (*v + free_space_inv >= *v) + *v += free_space_inv; + else + *v = U64_MAX; + + for (v = stripe->next_alloc; + v < stripe->next_alloc + ARRAY_SIZE(stripe->next_alloc); v++) + *v = *v < scale ? 0 : *v - scale; +} + +void bch2_dev_stripe_increment(struct bch_dev *ca, + struct dev_stripe_state *stripe) +{ + struct bch_dev_usage usage; + + bch2_dev_usage_read_fast(ca, &usage); + bch2_dev_stripe_increment_inlined(ca, stripe, &usage); +} + +static int add_new_bucket(struct bch_fs *c, + struct open_buckets *ptrs, + struct bch_devs_mask *devs_may_alloc, + unsigned nr_replicas, + unsigned *nr_effective, + bool *have_cache, + unsigned flags, + struct open_bucket *ob) +{ + unsigned durability = + bch_dev_bkey_exists(c, ob->dev)->mi.durability; + + BUG_ON(*nr_effective >= nr_replicas); + BUG_ON(flags & BCH_WRITE_ONLY_SPECIFIED_DEVS); + + __clear_bit(ob->dev, devs_may_alloc->d); + *nr_effective += (flags & BCH_WRITE_ONLY_SPECIFIED_DEVS) + ? durability : 1; + *have_cache |= !durability; + + ob_push(c, ptrs, ob); + + if (*nr_effective >= nr_replicas) + return 1; + if (ob->ec) + return 1; + return 0; +} + +int bch2_bucket_alloc_set_trans(struct btree_trans *trans, + struct open_buckets *ptrs, + struct dev_stripe_state *stripe, + struct bch_devs_mask *devs_may_alloc, + unsigned nr_replicas, + unsigned *nr_effective, + bool *have_cache, + unsigned flags, + enum bch_data_type data_type, + enum bch_watermark watermark, + struct closure *cl) +{ + struct bch_fs *c = trans->c; + struct dev_alloc_list devs_sorted = + bch2_dev_alloc_list(c, stripe, devs_may_alloc); + unsigned dev; + struct bch_dev *ca; + int ret = -BCH_ERR_insufficient_devices; + unsigned i; + + BUG_ON(*nr_effective >= nr_replicas); + + for (i = 0; i < devs_sorted.nr; i++) { + struct bch_dev_usage usage; + struct open_bucket *ob; + + dev = devs_sorted.devs[i]; + + rcu_read_lock(); + ca = rcu_dereference(c->devs[dev]); + if (ca) + percpu_ref_get(&ca->ref); + rcu_read_unlock(); + + if (!ca) + continue; + + if (!ca->mi.durability && *have_cache) { + percpu_ref_put(&ca->ref); + continue; + } + + ob = bch2_bucket_alloc_trans(trans, ca, watermark, cl, &usage); + if (!IS_ERR(ob)) + bch2_dev_stripe_increment_inlined(ca, stripe, &usage); + percpu_ref_put(&ca->ref); + + if (IS_ERR(ob)) { + ret = PTR_ERR(ob); + if (bch2_err_matches(ret, BCH_ERR_transaction_restart) || cl) + break; + continue; + } + + ob->data_type = data_type; + + if (add_new_bucket(c, ptrs, devs_may_alloc, + nr_replicas, nr_effective, + have_cache, flags, ob)) { + ret = 0; + break; + } + } + + return ret; +} + +/* Allocate from stripes: */ + +/* + * if we can't allocate a new stripe because there are already too many + * partially filled stripes, force allocating from an existing stripe even when + * it's to a device we don't want: + */ + +static int bucket_alloc_from_stripe(struct btree_trans *trans, + struct open_buckets *ptrs, + struct write_point *wp, + struct bch_devs_mask *devs_may_alloc, + u16 target, + unsigned nr_replicas, + unsigned *nr_effective, + bool *have_cache, + enum bch_watermark watermark, + unsigned flags, + struct closure *cl) +{ + struct bch_fs *c = trans->c; + struct dev_alloc_list devs_sorted; + struct ec_stripe_head *h; + struct open_bucket *ob; + unsigned i, ec_idx; + int ret = 0; + + if (nr_replicas < 2) + return 0; + + if (ec_open_bucket(c, ptrs)) + return 0; + + h = bch2_ec_stripe_head_get(trans, target, 0, nr_replicas - 1, watermark, cl); + if (IS_ERR(h)) + return PTR_ERR(h); + if (!h) + return 0; + + devs_sorted = bch2_dev_alloc_list(c, &wp->stripe, devs_may_alloc); + + for (i = 0; i < devs_sorted.nr; i++) + for (ec_idx = 0; ec_idx < h->s->nr_data; ec_idx++) { + if (!h->s->blocks[ec_idx]) + continue; + + ob = c->open_buckets + h->s->blocks[ec_idx]; + if (ob->dev == devs_sorted.devs[i] && + !test_and_set_bit(ec_idx, h->s->blocks_allocated)) + goto got_bucket; + } + goto out_put_head; +got_bucket: + ob->ec_idx = ec_idx; + ob->ec = h->s; + ec_stripe_new_get(h->s, STRIPE_REF_io); + + ret = add_new_bucket(c, ptrs, devs_may_alloc, + nr_replicas, nr_effective, + have_cache, flags, ob); +out_put_head: + bch2_ec_stripe_head_put(c, h); + return ret; +} + +/* Sector allocator */ + +static bool want_bucket(struct bch_fs *c, + struct write_point *wp, + struct bch_devs_mask *devs_may_alloc, + bool *have_cache, bool ec, + struct open_bucket *ob) +{ + struct bch_dev *ca = bch_dev_bkey_exists(c, ob->dev); + + if (!test_bit(ob->dev, devs_may_alloc->d)) + return false; + + if (ob->data_type != wp->data_type) + return false; + + if (!ca->mi.durability && + (wp->data_type == BCH_DATA_btree || ec || *have_cache)) + return false; + + if (ec != (ob->ec != NULL)) + return false; + + return true; +} + +static int bucket_alloc_set_writepoint(struct bch_fs *c, + struct open_buckets *ptrs, + struct write_point *wp, + struct bch_devs_mask *devs_may_alloc, + unsigned nr_replicas, + unsigned *nr_effective, + bool *have_cache, + bool ec, unsigned flags) +{ + struct open_buckets ptrs_skip = { .nr = 0 }; + struct open_bucket *ob; + unsigned i; + int ret = 0; + + open_bucket_for_each(c, &wp->ptrs, ob, i) { + if (!ret && want_bucket(c, wp, devs_may_alloc, + have_cache, ec, ob)) + ret = add_new_bucket(c, ptrs, devs_may_alloc, + nr_replicas, nr_effective, + have_cache, flags, ob); + else + ob_push(c, &ptrs_skip, ob); + } + wp->ptrs = ptrs_skip; + + return ret; +} + +static int bucket_alloc_set_partial(struct bch_fs *c, + struct open_buckets *ptrs, + struct write_point *wp, + struct bch_devs_mask *devs_may_alloc, + unsigned nr_replicas, + unsigned *nr_effective, + bool *have_cache, bool ec, + enum bch_watermark watermark, + unsigned flags) +{ + int i, ret = 0; + + if (!c->open_buckets_partial_nr) + return 0; + + spin_lock(&c->freelist_lock); + + if (!c->open_buckets_partial_nr) + goto unlock; + + for (i = c->open_buckets_partial_nr - 1; i >= 0; --i) { + struct open_bucket *ob = c->open_buckets + c->open_buckets_partial[i]; + + if (want_bucket(c, wp, devs_may_alloc, have_cache, ec, ob)) { + struct bch_dev *ca = bch_dev_bkey_exists(c, ob->dev); + struct bch_dev_usage usage; + u64 avail; + + bch2_dev_usage_read_fast(ca, &usage); + avail = dev_buckets_free(ca, usage, watermark); + if (!avail) + continue; + + array_remove_item(c->open_buckets_partial, + c->open_buckets_partial_nr, + i); + ob->on_partial_list = false; + + ret = add_new_bucket(c, ptrs, devs_may_alloc, + nr_replicas, nr_effective, + have_cache, flags, ob); + if (ret) + break; + } + } +unlock: + spin_unlock(&c->freelist_lock); + return ret; +} + +static int __open_bucket_add_buckets(struct btree_trans *trans, + struct open_buckets *ptrs, + struct write_point *wp, + struct bch_devs_list *devs_have, + u16 target, + bool erasure_code, + unsigned nr_replicas, + unsigned *nr_effective, + bool *have_cache, + enum bch_watermark watermark, + unsigned flags, + struct closure *_cl) +{ + struct bch_fs *c = trans->c; + struct bch_devs_mask devs; + struct open_bucket *ob; + struct closure *cl = NULL; + unsigned i; + int ret; + + devs = target_rw_devs(c, wp->data_type, target); + + /* Don't allocate from devices we already have pointers to: */ + for (i = 0; i < devs_have->nr; i++) + __clear_bit(devs_have->devs[i], devs.d); + + open_bucket_for_each(c, ptrs, ob, i) + __clear_bit(ob->dev, devs.d); + + if (erasure_code && ec_open_bucket(c, ptrs)) + return 0; + + ret = bucket_alloc_set_writepoint(c, ptrs, wp, &devs, + nr_replicas, nr_effective, + have_cache, erasure_code, flags); + if (ret) + return ret; + + ret = bucket_alloc_set_partial(c, ptrs, wp, &devs, + nr_replicas, nr_effective, + have_cache, erasure_code, watermark, flags); + if (ret) + return ret; + + if (erasure_code) { + ret = bucket_alloc_from_stripe(trans, ptrs, wp, &devs, + target, + nr_replicas, nr_effective, + have_cache, + watermark, flags, _cl); + } else { +retry_blocking: + /* + * Try nonblocking first, so that if one device is full we'll try from + * other devices: + */ + ret = bch2_bucket_alloc_set_trans(trans, ptrs, &wp->stripe, &devs, + nr_replicas, nr_effective, have_cache, + flags, wp->data_type, watermark, cl); + if (ret && + !bch2_err_matches(ret, BCH_ERR_transaction_restart) && + !bch2_err_matches(ret, BCH_ERR_insufficient_devices) && + !cl && _cl) { + cl = _cl; + goto retry_blocking; + } + } + + return ret; +} + +static int open_bucket_add_buckets(struct btree_trans *trans, + struct open_buckets *ptrs, + struct write_point *wp, + struct bch_devs_list *devs_have, + u16 target, + unsigned erasure_code, + unsigned nr_replicas, + unsigned *nr_effective, + bool *have_cache, + enum bch_watermark watermark, + unsigned flags, + struct closure *cl) +{ + int ret; + + if (erasure_code) { + ret = __open_bucket_add_buckets(trans, ptrs, wp, + devs_have, target, erasure_code, + nr_replicas, nr_effective, have_cache, + watermark, flags, cl); + if (bch2_err_matches(ret, BCH_ERR_transaction_restart) || + bch2_err_matches(ret, BCH_ERR_operation_blocked) || + bch2_err_matches(ret, BCH_ERR_freelist_empty) || + bch2_err_matches(ret, BCH_ERR_open_buckets_empty)) + return ret; + if (*nr_effective >= nr_replicas) + return 0; + } + + ret = __open_bucket_add_buckets(trans, ptrs, wp, + devs_have, target, false, + nr_replicas, nr_effective, have_cache, + watermark, flags, cl); + return ret < 0 ? ret : 0; +} + +/** + * should_drop_bucket - check if this is open_bucket should go away + * @ob: open_bucket to predicate on + * @c: filesystem handle + * @ca: if set, we're killing buckets for a particular device + * @ec: if true, we're shutting down erasure coding and killing all ec + * open_buckets + * otherwise, return true + * Returns: true if we should kill this open_bucket + * + * We're killing open_buckets because we're shutting down a device, erasure + * coding, or the entire filesystem - check if this open_bucket matches: + */ +static bool should_drop_bucket(struct open_bucket *ob, struct bch_fs *c, + struct bch_dev *ca, bool ec) +{ + if (ec) { + return ob->ec != NULL; + } else if (ca) { + bool drop = ob->dev == ca->dev_idx; + struct open_bucket *ob2; + unsigned i; + + if (!drop && ob->ec) { + unsigned nr_blocks; + + mutex_lock(&ob->ec->lock); + nr_blocks = bkey_i_to_stripe(&ob->ec->new_stripe.key)->v.nr_blocks; + + for (i = 0; i < nr_blocks; i++) { + if (!ob->ec->blocks[i]) + continue; + + ob2 = c->open_buckets + ob->ec->blocks[i]; + drop |= ob2->dev == ca->dev_idx; + } + mutex_unlock(&ob->ec->lock); + } + + return drop; + } else { + return true; + } +} + +static void bch2_writepoint_stop(struct bch_fs *c, struct bch_dev *ca, + bool ec, struct write_point *wp) +{ + struct open_buckets ptrs = { .nr = 0 }; + struct open_bucket *ob; + unsigned i; + + mutex_lock(&wp->lock); + open_bucket_for_each(c, &wp->ptrs, ob, i) + if (should_drop_bucket(ob, c, ca, ec)) + bch2_open_bucket_put(c, ob); + else + ob_push(c, &ptrs, ob); + wp->ptrs = ptrs; + mutex_unlock(&wp->lock); +} + +void bch2_open_buckets_stop(struct bch_fs *c, struct bch_dev *ca, + bool ec) +{ + unsigned i; + + /* Next, close write points that point to this device... */ + for (i = 0; i < ARRAY_SIZE(c->write_points); i++) + bch2_writepoint_stop(c, ca, ec, &c->write_points[i]); + + bch2_writepoint_stop(c, ca, ec, &c->copygc_write_point); + bch2_writepoint_stop(c, ca, ec, &c->rebalance_write_point); + bch2_writepoint_stop(c, ca, ec, &c->btree_write_point); + + mutex_lock(&c->btree_reserve_cache_lock); + while (c->btree_reserve_cache_nr) { + struct btree_alloc *a = + &c->btree_reserve_cache[--c->btree_reserve_cache_nr]; + + bch2_open_buckets_put(c, &a->ob); + } + mutex_unlock(&c->btree_reserve_cache_lock); + + spin_lock(&c->freelist_lock); + i = 0; + while (i < c->open_buckets_partial_nr) { + struct open_bucket *ob = + c->open_buckets + c->open_buckets_partial[i]; + + if (should_drop_bucket(ob, c, ca, ec)) { + --c->open_buckets_partial_nr; + swap(c->open_buckets_partial[i], + c->open_buckets_partial[c->open_buckets_partial_nr]); + ob->on_partial_list = false; + spin_unlock(&c->freelist_lock); + bch2_open_bucket_put(c, ob); + spin_lock(&c->freelist_lock); + } else { + i++; + } + } + spin_unlock(&c->freelist_lock); + + bch2_ec_stop_dev(c, ca); +} + +static inline struct hlist_head *writepoint_hash(struct bch_fs *c, + unsigned long write_point) +{ + unsigned hash = + hash_long(write_point, ilog2(ARRAY_SIZE(c->write_points_hash))); + + return &c->write_points_hash[hash]; +} + +static struct write_point *__writepoint_find(struct hlist_head *head, + unsigned long write_point) +{ + struct write_point *wp; + + rcu_read_lock(); + hlist_for_each_entry_rcu(wp, head, node) + if (wp->write_point == write_point) + goto out; + wp = NULL; +out: + rcu_read_unlock(); + return wp; +} + +static inline bool too_many_writepoints(struct bch_fs *c, unsigned factor) +{ + u64 stranded = c->write_points_nr * c->bucket_size_max; + u64 free = bch2_fs_usage_read_short(c).free; + + return stranded * factor > free; +} + +static bool try_increase_writepoints(struct bch_fs *c) +{ + struct write_point *wp; + + if (c->write_points_nr == ARRAY_SIZE(c->write_points) || + too_many_writepoints(c, 32)) + return false; + + wp = c->write_points + c->write_points_nr++; + hlist_add_head_rcu(&wp->node, writepoint_hash(c, wp->write_point)); + return true; +} + +static bool try_decrease_writepoints(struct btree_trans *trans, unsigned old_nr) +{ + struct bch_fs *c = trans->c; + struct write_point *wp; + struct open_bucket *ob; + unsigned i; + + mutex_lock(&c->write_points_hash_lock); + if (c->write_points_nr < old_nr) { + mutex_unlock(&c->write_points_hash_lock); + return true; + } + + if (c->write_points_nr == 1 || + !too_many_writepoints(c, 8)) { + mutex_unlock(&c->write_points_hash_lock); + return false; + } + + wp = c->write_points + --c->write_points_nr; + + hlist_del_rcu(&wp->node); + mutex_unlock(&c->write_points_hash_lock); + + bch2_trans_mutex_lock_norelock(trans, &wp->lock); + open_bucket_for_each(c, &wp->ptrs, ob, i) + open_bucket_free_unused(c, ob); + wp->ptrs.nr = 0; + mutex_unlock(&wp->lock); + return true; +} + +static struct write_point *writepoint_find(struct btree_trans *trans, + unsigned long write_point) +{ + struct bch_fs *c = trans->c; + struct write_point *wp, *oldest; + struct hlist_head *head; + + if (!(write_point & 1UL)) { + wp = (struct write_point *) write_point; + bch2_trans_mutex_lock_norelock(trans, &wp->lock); + return wp; + } + + head = writepoint_hash(c, write_point); +restart_find: + wp = __writepoint_find(head, write_point); + if (wp) { +lock_wp: + bch2_trans_mutex_lock_norelock(trans, &wp->lock); + if (wp->write_point == write_point) + goto out; + mutex_unlock(&wp->lock); + goto restart_find; + } +restart_find_oldest: + oldest = NULL; + for (wp = c->write_points; + wp < c->write_points + c->write_points_nr; wp++) + if (!oldest || time_before64(wp->last_used, oldest->last_used)) + oldest = wp; + + bch2_trans_mutex_lock_norelock(trans, &oldest->lock); + bch2_trans_mutex_lock_norelock(trans, &c->write_points_hash_lock); + if (oldest >= c->write_points + c->write_points_nr || + try_increase_writepoints(c)) { + mutex_unlock(&c->write_points_hash_lock); + mutex_unlock(&oldest->lock); + goto restart_find_oldest; + } + + wp = __writepoint_find(head, write_point); + if (wp && wp != oldest) { + mutex_unlock(&c->write_points_hash_lock); + mutex_unlock(&oldest->lock); + goto lock_wp; + } + + wp = oldest; + hlist_del_rcu(&wp->node); + wp->write_point = write_point; + hlist_add_head_rcu(&wp->node, head); + mutex_unlock(&c->write_points_hash_lock); +out: + wp->last_used = local_clock(); + return wp; +} + +/* + * Get us an open_bucket we can allocate from, return with it locked: + */ +int bch2_alloc_sectors_start_trans(struct btree_trans *trans, + unsigned target, + unsigned erasure_code, + struct write_point_specifier write_point, + struct bch_devs_list *devs_have, + unsigned nr_replicas, + unsigned nr_replicas_required, + enum bch_watermark watermark, + unsigned flags, + struct closure *cl, + struct write_point **wp_ret) +{ + struct bch_fs *c = trans->c; + struct write_point *wp; + struct open_bucket *ob; + struct open_buckets ptrs; + unsigned nr_effective, write_points_nr; + bool have_cache; + int ret; + int i; + + BUG_ON(flags & BCH_WRITE_ONLY_SPECIFIED_DEVS); + + BUG_ON(!nr_replicas || !nr_replicas_required); +retry: + ptrs.nr = 0; + nr_effective = 0; + write_points_nr = c->write_points_nr; + have_cache = false; + + *wp_ret = wp = writepoint_find(trans, write_point.v); + + /* metadata may not allocate on cache devices: */ + if (wp->data_type != BCH_DATA_user) + have_cache = true; + + if (target && !(flags & BCH_WRITE_ONLY_SPECIFIED_DEVS)) { + ret = open_bucket_add_buckets(trans, &ptrs, wp, devs_have, + target, erasure_code, + nr_replicas, &nr_effective, + &have_cache, watermark, + flags, NULL); + if (!ret || + bch2_err_matches(ret, BCH_ERR_transaction_restart)) + goto alloc_done; + + /* Don't retry from all devices if we're out of open buckets: */ + if (bch2_err_matches(ret, BCH_ERR_open_buckets_empty)) + goto allocate_blocking; + + /* + * Only try to allocate cache (durability = 0 devices) from the + * specified target: + */ + have_cache = true; + + ret = open_bucket_add_buckets(trans, &ptrs, wp, devs_have, + 0, erasure_code, + nr_replicas, &nr_effective, + &have_cache, watermark, + flags, cl); + } else { +allocate_blocking: + ret = open_bucket_add_buckets(trans, &ptrs, wp, devs_have, + target, erasure_code, + nr_replicas, &nr_effective, + &have_cache, watermark, + flags, cl); + } +alloc_done: + BUG_ON(!ret && nr_effective < nr_replicas); + + if (erasure_code && !ec_open_bucket(c, &ptrs)) + pr_debug("failed to get ec bucket: ret %u", ret); + + if (ret == -BCH_ERR_insufficient_devices && + nr_effective >= nr_replicas_required) + ret = 0; + + if (ret) + goto err; + + /* Free buckets we didn't use: */ + open_bucket_for_each(c, &wp->ptrs, ob, i) + open_bucket_free_unused(c, ob); + + wp->ptrs = ptrs; + + wp->sectors_free = UINT_MAX; + + open_bucket_for_each(c, &wp->ptrs, ob, i) + wp->sectors_free = min(wp->sectors_free, ob->sectors_free); + + BUG_ON(!wp->sectors_free || wp->sectors_free == UINT_MAX); + + return 0; +err: + open_bucket_for_each(c, &wp->ptrs, ob, i) + if (ptrs.nr < ARRAY_SIZE(ptrs.v)) + ob_push(c, &ptrs, ob); + else + open_bucket_free_unused(c, ob); + wp->ptrs = ptrs; + + mutex_unlock(&wp->lock); + + if (bch2_err_matches(ret, BCH_ERR_freelist_empty) && + try_decrease_writepoints(trans, write_points_nr)) + goto retry; + + if (bch2_err_matches(ret, BCH_ERR_open_buckets_empty) || + bch2_err_matches(ret, BCH_ERR_freelist_empty)) + return cl + ? -BCH_ERR_bucket_alloc_blocked + : -BCH_ERR_ENOSPC_bucket_alloc; + + return ret; +} + +struct bch_extent_ptr bch2_ob_ptr(struct bch_fs *c, struct open_bucket *ob) +{ + struct bch_dev *ca = bch_dev_bkey_exists(c, ob->dev); + + return (struct bch_extent_ptr) { + .type = 1 << BCH_EXTENT_ENTRY_ptr, + .gen = ob->gen, + .dev = ob->dev, + .offset = bucket_to_sector(ca, ob->bucket) + + ca->mi.bucket_size - + ob->sectors_free, + }; +} + +void bch2_alloc_sectors_append_ptrs(struct bch_fs *c, struct write_point *wp, + struct bkey_i *k, unsigned sectors, + bool cached) +{ + bch2_alloc_sectors_append_ptrs_inlined(c, wp, k, sectors, cached); +} + +/* + * Append pointers to the space we just allocated to @k, and mark @sectors space + * as allocated out of @ob + */ +void bch2_alloc_sectors_done(struct bch_fs *c, struct write_point *wp) +{ + bch2_alloc_sectors_done_inlined(c, wp); +} + +static inline void writepoint_init(struct write_point *wp, + enum bch_data_type type) +{ + mutex_init(&wp->lock); + wp->data_type = type; + + INIT_WORK(&wp->index_update_work, bch2_write_point_do_index_updates); + INIT_LIST_HEAD(&wp->writes); + spin_lock_init(&wp->writes_lock); +} + +void bch2_fs_allocator_foreground_init(struct bch_fs *c) +{ + struct open_bucket *ob; + struct write_point *wp; + + mutex_init(&c->write_points_hash_lock); + c->write_points_nr = ARRAY_SIZE(c->write_points); + + /* open bucket 0 is a sentinal NULL: */ + spin_lock_init(&c->open_buckets[0].lock); + + for (ob = c->open_buckets + 1; + ob < c->open_buckets + ARRAY_SIZE(c->open_buckets); ob++) { + spin_lock_init(&ob->lock); + c->open_buckets_nr_free++; + + ob->freelist = c->open_buckets_freelist; + c->open_buckets_freelist = ob - c->open_buckets; + } + + writepoint_init(&c->btree_write_point, BCH_DATA_btree); + writepoint_init(&c->rebalance_write_point, BCH_DATA_user); + writepoint_init(&c->copygc_write_point, BCH_DATA_user); + + for (wp = c->write_points; + wp < c->write_points + c->write_points_nr; wp++) { + writepoint_init(wp, BCH_DATA_user); + + wp->last_used = local_clock(); + wp->write_point = (unsigned long) wp; + hlist_add_head_rcu(&wp->node, + writepoint_hash(c, wp->write_point)); + } +} + +static void bch2_open_bucket_to_text(struct printbuf *out, struct bch_fs *c, struct open_bucket *ob) +{ + struct bch_dev *ca = bch_dev_bkey_exists(c, ob->dev); + unsigned data_type = ob->data_type; + barrier(); /* READ_ONCE() doesn't work on bitfields */ + + prt_printf(out, "%zu ref %u %s %u:%llu gen %u allocated %u/%u", + ob - c->open_buckets, + atomic_read(&ob->pin), + data_type < BCH_DATA_NR ? bch2_data_types[data_type] : "invalid data type", + ob->dev, ob->bucket, ob->gen, + ca->mi.bucket_size - ob->sectors_free, ca->mi.bucket_size); + if (ob->ec) + prt_printf(out, " ec idx %llu", ob->ec->idx); + if (ob->on_partial_list) + prt_str(out, " partial"); + prt_newline(out); +} + +void bch2_open_buckets_to_text(struct printbuf *out, struct bch_fs *c) +{ + struct open_bucket *ob; + + out->atomic++; + + for (ob = c->open_buckets; + ob < c->open_buckets + ARRAY_SIZE(c->open_buckets); + ob++) { + spin_lock(&ob->lock); + if (ob->valid && !ob->on_partial_list) + bch2_open_bucket_to_text(out, c, ob); + spin_unlock(&ob->lock); + } + + --out->atomic; +} + +void bch2_open_buckets_partial_to_text(struct printbuf *out, struct bch_fs *c) +{ + unsigned i; + + out->atomic++; + spin_lock(&c->freelist_lock); + + for (i = 0; i < c->open_buckets_partial_nr; i++) + bch2_open_bucket_to_text(out, c, + c->open_buckets + c->open_buckets_partial[i]); + + spin_unlock(&c->freelist_lock); + --out->atomic; +} + +static const char * const bch2_write_point_states[] = { +#define x(n) #n, + WRITE_POINT_STATES() +#undef x + NULL +}; + +static void bch2_write_point_to_text(struct printbuf *out, struct bch_fs *c, + struct write_point *wp) +{ + struct open_bucket *ob; + unsigned i; + + prt_printf(out, "%lu: ", wp->write_point); + prt_human_readable_u64(out, wp->sectors_allocated); + + prt_printf(out, " last wrote: "); + bch2_pr_time_units(out, sched_clock() - wp->last_used); + + for (i = 0; i < WRITE_POINT_STATE_NR; i++) { + prt_printf(out, " %s: ", bch2_write_point_states[i]); + bch2_pr_time_units(out, wp->time[i]); + } + + prt_newline(out); + + printbuf_indent_add(out, 2); + open_bucket_for_each(c, &wp->ptrs, ob, i) + bch2_open_bucket_to_text(out, c, ob); + printbuf_indent_sub(out, 2); +} + +void bch2_write_points_to_text(struct printbuf *out, struct bch_fs *c) +{ + struct write_point *wp; + + prt_str(out, "Foreground write points\n"); + for (wp = c->write_points; + wp < c->write_points + ARRAY_SIZE(c->write_points); + wp++) + bch2_write_point_to_text(out, c, wp); + + prt_str(out, "Copygc write point\n"); + bch2_write_point_to_text(out, c, &c->copygc_write_point); + + prt_str(out, "Rebalance write point\n"); + bch2_write_point_to_text(out, c, &c->rebalance_write_point); + + prt_str(out, "Btree write point\n"); + bch2_write_point_to_text(out, c, &c->btree_write_point); +} |