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-rw-r--r--fs/bcachefs/alloc_foreground.c1638
1 files changed, 1638 insertions, 0 deletions
diff --git a/fs/bcachefs/alloc_foreground.c b/fs/bcachefs/alloc_foreground.c
new file mode 100644
index 0000000000..0e61579826
--- /dev/null
+++ b/fs/bcachefs/alloc_foreground.c
@@ -0,0 +1,1638 @@
+// 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, citer;
+ struct bkey_s_c k, ck;
+ struct open_bucket *ob = NULL;
+ u64 first_bucket = max_t(u64, ca->mi.first_bucket, ca->new_fs_bucket_idx);
+ u64 alloc_start = max(first_bucket, READ_ONCE(ca->alloc_cursor));
+ u64 alloc_cursor = alloc_start;
+ int ret;
+
+ /*
+ * Scan with an uncached iterator to avoid polluting the key cache. An
+ * uncached iter will return a cached key if one exists, but if not
+ * there is no other underlying protection for the associated key cache
+ * slot. To avoid racing bucket allocations, look up the cached key slot
+ * of any likely allocation candidate before attempting to proceed with
+ * the allocation. This provides proper exclusion on the associated
+ * bucket.
+ */
+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;
+
+ /* now check the cached key to serialize concurrent allocs of the bucket */
+ ck = bch2_bkey_get_iter(trans, &citer, BTREE_ID_alloc, k.k->p, BTREE_ITER_CACHED);
+ ret = bkey_err(ck);
+ if (ret)
+ break;
+
+ a = bch2_alloc_to_v4(ck, &a_convert);
+ if (a->data_type != BCH_DATA_free)
+ goto next;
+
+ s->buckets_seen++;
+
+ ob = __try_alloc_bucket(trans->c, ca, k.k->p.offset, watermark, a, s, cl);
+next:
+ citer.path->preserve = false;
+ bch2_trans_iter_exit(trans, &citer);
+ if (ob)
+ break;
+ }
+ bch2_trans_iter_exit(trans, &iter);
+
+ alloc_cursor = iter.pos.offset;
+ ca->alloc_cursor = alloc_cursor;
+
+ if (!ob && ret)
+ ob = ERR_PTR(ret);
+
+ if (!ob && alloc_start > first_bucket) {
+ alloc_cursor = alloc_start = first_bucket;
+ 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;
+}
+
+static noinline void
+deallocate_extra_replicas(struct bch_fs *c,
+ struct open_buckets *ptrs,
+ struct open_buckets *ptrs_no_use,
+ unsigned extra_replicas)
+{
+ struct open_buckets ptrs2 = { 0 };
+ struct open_bucket *ob;
+ unsigned i;
+
+ open_bucket_for_each(c, ptrs, ob, i) {
+ unsigned d = bch_dev_bkey_exists(c, ob->dev)->mi.durability;
+
+ if (d && d <= extra_replicas) {
+ extra_replicas -= d;
+ ob_push(c, ptrs_no_use, ob);
+ } else {
+ ob_push(c, &ptrs2, ob);
+ }
+ }
+
+ *ptrs = ptrs2;
+}
+
+/*
+ * 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;
+
+ if (!IS_ENABLED(CONFIG_BCACHEFS_ERASURE_CODING))
+ erasure_code = false;
+
+ 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)) {
+ int ret = open_bucket_add_buckets(trans, &ptrs, wp, devs_have,
+ target, erasure_code,
+ nr_replicas, &nr_effective,
+ &have_cache, watermark,
+ flags, cl);
+ if (!ret ||
+ bch2_err_matches(ret, BCH_ERR_transaction_restart) ||
+ bch2_err_matches(ret, BCH_ERR_open_buckets_empty))
+ goto alloc_done;
+ }
+
+ /*
+ * 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 {
+ 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;
+
+ if (nr_effective > nr_replicas)
+ deallocate_extra_replicas(c, &ptrs, &wp->ptrs, nr_effective - nr_replicas);
+
+ /* 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);
+}