X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=libbcachefs%2Falloc_foreground.c;h=ca58193dd90279b6d6081f06954690f214ba3a42;hb=HEAD;hp=affddf1f03fff0cb3121ab5f767df65beb1d19b9;hpb=da6a35689518599b381c285cd9505ab8d58f7c73;p=bcachefs-tools-debian

diff --git a/libbcachefs/alloc_foreground.c b/libbcachefs/alloc_foreground.c
index affddf1..ca58193 100644
--- a/libbcachefs/alloc_foreground.c
+++ b/libbcachefs/alloc_foreground.c
@@ -25,19 +25,28 @@
 #include "disk_groups.h"
 #include "ec.h"
 #include "error.h"
-#include "io.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>
-#include <trace/events/bcachefs.h>
 
-const char * const bch2_alloc_reserves[] = {
+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_ALLOC_RESERVES()
+	BCH_WATERMARKS()
 #undef x
 	NULL
 };
@@ -60,11 +69,8 @@ const char * const bch2_alloc_reserves[] = {
 
 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)
+	for_each_member_device_rcu(c, ca, NULL)
 		ca->alloc_cursor = 0;
 	rcu_read_unlock();
 }
@@ -97,7 +103,7 @@ 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) {
-		bch2_ec_bucket_written(c, ob);
+		ec_stripe_new_put(c, ob->ec, STRIPE_REF_io);
 		return;
 	}
 
@@ -150,30 +156,19 @@ static struct open_bucket *bch2_open_bucket_alloc(struct bch_fs *c)
 	return ob;
 }
 
-static void open_bucket_free_unused(struct bch_fs *c,
-				    struct write_point *wp,
-				    struct open_bucket *ob)
+static void open_bucket_free_unused(struct bch_fs *c, struct open_bucket *ob)
 {
-	struct bch_dev *ca = bch_dev_bkey_exists(c, ob->dev);
-	bool may_realloc = wp->data_type == BCH_DATA_user;
-
-	BUG_ON(ca->open_buckets_partial_nr >
-	       ARRAY_SIZE(ca->open_buckets_partial));
-
-	if (ca->open_buckets_partial_nr <
-	    ARRAY_SIZE(ca->open_buckets_partial) &&
-	    may_realloc) {
-		spin_lock(&c->freelist_lock);
-		ob->on_partial_list = true;
-		ca->open_buckets_partial[ca->open_buckets_partial_nr++] =
-			ob - c->open_buckets;
-		spin_unlock(&c->freelist_lock);
+	BUG_ON(c->open_buckets_partial_nr >=
+	       ARRAY_SIZE(c->open_buckets_partial));
 
-		closure_wake_up(&c->open_buckets_wait);
-		closure_wake_up(&c->freelist_wait);
-	} else {
-		bch2_open_bucket_put(c, ob);
-	}
+	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: */
@@ -190,14 +185,16 @@ long bch2_bucket_alloc_new_fs(struct bch_dev *ca)
 	return -1;
 }
 
-static inline unsigned open_buckets_reserved(enum alloc_reserve reserve)
+static inline unsigned open_buckets_reserved(enum bch_watermark watermark)
 {
-	switch (reserve) {
-	case RESERVE_btree:
-	case RESERVE_btree_movinggc:
+	switch (watermark) {
+	case BCH_WATERMARK_reclaim:
 		return 0;
-	case RESERVE_movinggc:
+	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;
 	}
@@ -205,7 +202,7 @@ static inline unsigned open_buckets_reserved(enum alloc_reserve reserve)
 
 static struct open_bucket *__try_alloc_bucket(struct bch_fs *c, struct bch_dev *ca,
 					      u64 bucket,
-					      enum alloc_reserve reserve,
+					      enum bch_watermark watermark,
 					      const struct bch_alloc_v4 *a,
 					      struct bucket_alloc_state *s,
 					      struct closure *cl)
@@ -235,13 +232,11 @@ static struct open_bucket *__try_alloc_bucket(struct bch_fs *c, struct bch_dev *
 
 	spin_lock(&c->freelist_lock);
 
-	if (unlikely(c->open_buckets_nr_free <= open_buckets_reserved(reserve))) {
+	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();
-
+		track_event_change(&c->times[BCH_TIME_blocked_allocate_open_bucket], true);
 		spin_unlock(&c->freelist_lock);
 		return ERR_PTR(-BCH_ERR_open_buckets_empty);
 	}
@@ -259,7 +254,6 @@ static struct open_bucket *__try_alloc_bucket(struct bch_fs *c, struct bch_dev *
 
 	ob->valid	= true;
 	ob->sectors_free = ca->mi.bucket_size;
-	ob->alloc_reserve = reserve;
 	ob->dev		= ca->dev_idx;
 	ob->gen		= a->gen;
 	ob->bucket	= bucket;
@@ -268,26 +262,15 @@ static struct open_bucket *__try_alloc_bucket(struct bch_fs *c, struct bch_dev *
 	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;
-	}
+	track_event_change(&c->times[BCH_TIME_blocked_allocate_open_bucket], false);
+	track_event_change(&c->times[BCH_TIME_blocked_allocate], false);
 
 	spin_unlock(&c->freelist_lock);
 	return ob;
 }
 
 static struct open_bucket *try_alloc_bucket(struct btree_trans *trans, struct bch_dev *ca,
-					    enum alloc_reserve reserve, u64 free_entry,
+					    enum bch_watermark watermark, u64 free_entry,
 					    struct bucket_alloc_state *s,
 					    struct bkey_s_c freespace_k,
 					    struct closure *cl)
@@ -313,8 +296,9 @@ static struct open_bucket *try_alloc_bucket(struct btree_trans *trans, struct bc
 		goto err;
 	}
 
-	bch2_trans_iter_init(trans, &iter, BTREE_ID_alloc, POS(ca->dev_idx, b), BTREE_ITER_CACHED);
-	k = bch2_btree_iter_peek_slot(&iter);
+	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);
@@ -324,7 +308,7 @@ static struct open_bucket *try_alloc_bucket(struct btree_trans *trans, struct bc
 	a = bch2_alloc_to_v4(k, &a_convert);
 
 	if (a->data_type != BCH_DATA_free) {
-		if (!test_bit(BCH_FS_CHECK_ALLOC_DONE, &c->flags)) {
+		if (c->curr_recovery_pass <= BCH_RECOVERY_PASS_check_alloc_info) {
 			ob = NULL;
 			goto err;
 		}
@@ -340,7 +324,7 @@ static struct open_bucket *try_alloc_bucket(struct btree_trans *trans, struct bc
 	}
 
 	if (genbits != (alloc_freespace_genbits(*a) >> 56) &&
-	    test_bit(BCH_FS_CHECK_ALLOC_DONE, &c->flags)) {
+	    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);
@@ -350,22 +334,21 @@ static struct open_bucket *try_alloc_bucket(struct btree_trans *trans, struct bc
 		bch2_trans_inconsistent(trans, "%s", buf.buf);
 		ob = ERR_PTR(-EIO);
 		goto err;
-
 	}
 
-	if (!test_bit(BCH_FS_CHECK_BACKPOINTERS_DONE, &c->flags)) {
+	if (c->curr_recovery_pass <= BCH_RECOVERY_PASS_check_extents_to_backpointers) {
 		struct bch_backpointer bp;
-		u64 bp_offset = 0;
+		struct bpos bp_pos = POS_MIN;
 
 		ret = bch2_get_next_backpointer(trans, POS(ca->dev_idx, b), -1,
-						&bp_offset, &bp,
+						&bp_pos, &bp,
 						BTREE_ITER_NOPRESERVE);
 		if (ret) {
 			ob = ERR_PTR(ret);
 			goto err;
 		}
 
-		if (bp_offset != U64_MAX) {
+		if (!bkey_eq(bp_pos, POS_MAX)) {
 			/*
 			 * Bucket may have data in it - we don't call
 			 * bc2h_trans_inconnsistent() because fsck hasn't
@@ -376,42 +359,17 @@ static struct open_bucket *try_alloc_bucket(struct btree_trans *trans, struct bc
 		}
 	}
 
-	ob = __try_alloc_bucket(c, ca, b, reserve, a, s, cl);
+	ob = __try_alloc_bucket(c, ca, b, watermark, a, s, cl);
 	if (!ob)
-		iter.path->preserve = false;
+		set_btree_iter_dontneed(&iter);
 err:
-	set_btree_iter_dontneed(&iter);
+	if (iter.path)
+		set_btree_iter_dontneed(&iter);
 	bch2_trans_iter_exit(trans, &iter);
 	printbuf_exit(&buf);
 	return ob;
 }
 
-static struct open_bucket *try_alloc_partial_bucket(struct bch_fs *c, struct bch_dev *ca,
-						    enum alloc_reserve reserve)
-{
-	struct open_bucket *ob;
-	int i;
-
-	spin_lock(&c->freelist_lock);
-
-	for (i = ca->open_buckets_partial_nr - 1; i >= 0; --i) {
-		ob = c->open_buckets + ca->open_buckets_partial[i];
-
-		if (reserve <= ob->alloc_reserve) {
-			array_remove_item(ca->open_buckets_partial,
-					  ca->open_buckets_partial_nr,
-					  i);
-			ob->on_partial_list = false;
-			ob->alloc_reserve = reserve;
-			spin_unlock(&c->freelist_lock);
-			return ob;
-		}
-	}
-
-	spin_unlock(&c->freelist_lock);
-	return NULL;
-}
-
 /*
  * This path is for before the freespace btree is initialized:
  *
@@ -421,16 +379,27 @@ static struct open_bucket *try_alloc_partial_bucket(struct bch_fs *c, struct bch
 static noinline struct open_bucket *
 bch2_bucket_alloc_early(struct btree_trans *trans,
 			struct bch_dev *ca,
-			enum alloc_reserve reserve,
+			enum bch_watermark watermark,
 			struct bucket_alloc_state *s,
 			struct closure *cl)
 {
-	struct btree_iter iter;
-	struct bkey_s_c k;
+	struct btree_iter iter, citer;
+	struct bkey_s_c k, ck;
 	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));
+	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) {
@@ -445,25 +414,38 @@ again:
 			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, reserve, a, s, cl);
+		ob = __try_alloc_bucket(trans->c, ca, k.k->p.offset, watermark, a, s, cl);
+next:
+		set_btree_iter_dontneed(&citer);
+		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_cursor > alloc_start) {
-		alloc_cursor = alloc_start;
+	if (!ob && alloc_start > first_bucket) {
+		alloc_cursor = alloc_start = first_bucket;
 		goto again;
 	}
 
@@ -472,7 +454,7 @@ again:
 
 static struct open_bucket *bch2_bucket_alloc_freelist(struct btree_trans *trans,
 						   struct bch_dev *ca,
-						   enum alloc_reserve reserve,
+						   enum bch_watermark watermark,
 						   struct bucket_alloc_state *s,
 						   struct closure *cl)
 {
@@ -501,10 +483,10 @@ again:
 
 			s->buckets_seen++;
 
-			ob = try_alloc_bucket(trans, ca, reserve,
+			ob = try_alloc_bucket(trans, ca, watermark,
 					      alloc_cursor, s, k, cl);
 			if (ob) {
-				iter.path->preserve = false;
+				set_btree_iter_dontneed(&iter);
 				break;
 			}
 		}
@@ -528,14 +510,18 @@ again:
 }
 
 /**
- * bch_bucket_alloc - allocate a single bucket from a specific device
+ * 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 index of bucket on success, 0 on failure
+ * 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 alloc_reserve reserve,
-				      bool may_alloc_partial,
+				      enum bch_watermark watermark,
 				      struct closure *cl,
 				      struct bch_dev_usage *usage)
 {
@@ -547,7 +533,7 @@ static struct open_bucket *bch2_bucket_alloc_trans(struct btree_trans *trans,
 	bool waiting = false;
 again:
 	bch2_dev_usage_read_fast(ca, usage);
-	avail = dev_buckets_free(ca, *usage, reserve);
+	avail = dev_buckets_free(ca, *usage, watermark);
 
 	if (usage->d[BCH_DATA_need_discard].buckets > avail)
 		bch2_do_discards(c);
@@ -565,8 +551,7 @@ again:
 			goto again;
 		}
 
-		if (!c->blocked_allocate)
-			c->blocked_allocate = local_clock();
+		track_event_change(&c->times[BCH_TIME_blocked_allocate], true);
 
 		ob = ERR_PTR(-BCH_ERR_freelist_empty);
 		goto err;
@@ -574,21 +559,15 @@ again:
 
 	if (waiting)
 		closure_wake_up(&c->freelist_wait);
-
-	if (may_alloc_partial) {
-		ob = try_alloc_partial_bucket(c, ca, reserve);
-		if (ob)
-			return ob;
-	}
 alloc:
 	ob = likely(freespace)
-		? bch2_bucket_alloc_freelist(trans, ca, reserve, &s, cl)
-		: bch2_bucket_alloc_early(trans, ca, reserve, &s, cl);
+		? 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 && !test_bit(BCH_FS_CHECK_ALLOC_DONE, &c->flags)) {
+	if (!ob && freespace && c->curr_recovery_pass <= BCH_RECOVERY_PASS_check_alloc_info) {
 		freespace = false;
 		goto alloc;
 	}
@@ -598,8 +577,7 @@ err:
 
 	if (!IS_ERR(ob))
 		trace_and_count(c, bucket_alloc, ca,
-				bch2_alloc_reserves[reserve],
-				may_alloc_partial,
+				bch2_watermarks[watermark],
 				ob->bucket,
 				usage->d[BCH_DATA_free].buckets,
 				avail,
@@ -610,8 +588,7 @@ err:
 				"");
 	else if (!bch2_err_matches(PTR_ERR(ob), BCH_ERR_transaction_restart))
 		trace_and_count(c, bucket_alloc_fail, ca,
-				bch2_alloc_reserves[reserve],
-				may_alloc_partial,
+				bch2_watermarks[watermark],
 				0,
 				usage->d[BCH_DATA_free].buckets,
 				avail,
@@ -625,16 +602,15 @@ err:
 }
 
 struct open_bucket *bch2_bucket_alloc(struct bch_fs *c, struct bch_dev *ca,
-				      enum alloc_reserve reserve,
-				      bool may_alloc_partial,
+				      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, reserve,
-							may_alloc_partial, cl, &usage)));
+		      PTR_ERR_OR_ZERO(ob = bch2_bucket_alloc_trans(trans, ca, watermark,
+							cl, &usage)));
 	return ob;
 }
 
@@ -666,7 +642,7 @@ static inline void bch2_dev_stripe_increment_inlined(struct bch_dev *ca,
 			       struct bch_dev_usage *usage)
 {
 	u64 *v = stripe->next_alloc + ca->dev_idx;
-	u64 free_space = dev_buckets_available(ca, RESERVE_none);
+	u64 free_space = dev_buckets_available(ca, BCH_WATERMARK_normal);
 	u64 free_space_inv = free_space
 		? div64_u64(1ULL << 48, free_space)
 		: 1ULL << 48;
@@ -691,12 +667,10 @@ void bch2_dev_stripe_increment(struct bch_dev *ca,
 	bch2_dev_stripe_increment_inlined(ca, stripe, &usage);
 }
 
-#define BUCKET_MAY_ALLOC_PARTIAL	(1 << 0)
-#define BUCKET_ALLOC_USE_DURABILITY	(1 << 1)
-
-static void add_new_bucket(struct bch_fs *c,
+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,
@@ -705,12 +679,19 @@ static void add_new_bucket(struct bch_fs *c,
 	unsigned durability =
 		bch_dev_bkey_exists(c, ob->dev)->mi.durability;
 
+	BUG_ON(*nr_effective >= nr_replicas);
+
 	__clear_bit(ob->dev, devs_may_alloc->d);
-	*nr_effective	+= (flags & BUCKET_ALLOC_USE_DURABILITY)
-		? durability : 1;
+	*nr_effective	+= durability;
 	*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,
@@ -720,8 +701,9 @@ int bch2_bucket_alloc_set_trans(struct btree_trans *trans,
 		      unsigned nr_replicas,
 		      unsigned *nr_effective,
 		      bool *have_cache,
-		      enum alloc_reserve reserve,
 		      unsigned flags,
+		      enum bch_data_type data_type,
+		      enum bch_watermark watermark,
 		      struct closure *cl)
 {
 	struct bch_fs *c = trans->c;
@@ -754,8 +736,7 @@ int bch2_bucket_alloc_set_trans(struct btree_trans *trans,
 			continue;
 		}
 
-		ob = bch2_bucket_alloc_trans(trans, ca, reserve,
-				flags & BUCKET_MAY_ALLOC_PARTIAL, cl, &usage);
+		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);
@@ -767,10 +748,11 @@ int bch2_bucket_alloc_set_trans(struct btree_trans *trans,
 			continue;
 		}
 
-		add_new_bucket(c, ptrs, devs_may_alloc,
-			       nr_effective, have_cache, flags, ob);
+		ob->data_type = data_type;
 
-		if (*nr_effective >= nr_replicas) {
+		if (add_new_bucket(c, ptrs, devs_may_alloc,
+				   nr_replicas, nr_effective,
+				   have_cache, flags, ob)) {
 			ret = 0;
 			break;
 		}
@@ -792,10 +774,10 @@ static int bucket_alloc_from_stripe(struct btree_trans *trans,
 			 struct write_point *wp,
 			 struct bch_devs_mask *devs_may_alloc,
 			 u16 target,
-			 unsigned erasure_code,
 			 unsigned nr_replicas,
 			 unsigned *nr_effective,
 			 bool *have_cache,
+			 enum bch_watermark watermark,
 			 unsigned flags,
 			 struct closure *cl)
 {
@@ -803,11 +785,8 @@ static int bucket_alloc_from_stripe(struct btree_trans *trans,
 	struct dev_alloc_list devs_sorted;
 	struct ec_stripe_head *h;
 	struct open_bucket *ob;
-	struct bch_dev *ca;
 	unsigned i, ec_idx;
-
-	if (!erasure_code)
-		return 0;
+	int ret = 0;
 
 	if (nr_replicas < 2)
 		return 0;
@@ -815,9 +794,7 @@ static int bucket_alloc_from_stripe(struct btree_trans *trans,
 	if (ec_open_bucket(c, ptrs))
 		return 0;
 
-	h = bch2_ec_stripe_head_get(trans, target, 0, nr_replicas - 1,
-				    wp == &c->copygc_write_point,
-				    cl);
+	h = bch2_ec_stripe_head_get(trans, target, 0, nr_replicas - 1, watermark, cl);
 	if (IS_ERR(h))
 		return PTR_ERR(h);
 	if (!h)
@@ -837,63 +814,132 @@ static int bucket_alloc_from_stripe(struct btree_trans *trans,
 		}
 	goto out_put_head;
 got_bucket:
-	ca = bch_dev_bkey_exists(c, ob->dev);
-
 	ob->ec_idx	= ec_idx;
 	ob->ec		= h->s;
+	ec_stripe_new_get(h->s, STRIPE_REF_io);
 
-	add_new_bucket(c, ptrs, devs_may_alloc,
-		       nr_effective, have_cache, flags, ob);
-	atomic_inc(&h->s->pin);
+	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 0;
+	return ret;
 }
 
 /* Sector allocator */
 
-static void get_buckets_from_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,
-					unsigned flags,
-					bool need_ec)
+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) {
-		struct bch_dev *ca = bch_dev_bkey_exists(c, ob->dev);
-
-		if (*nr_effective < nr_replicas &&
-		    test_bit(ob->dev, devs_may_alloc->d) &&
-		    (ca->mi.durability ||
-		     (wp->data_type == BCH_DATA_user && !*have_cache)) &&
-		    (ob->ec || !need_ec)) {
-			add_new_bucket(c, ptrs, devs_may_alloc,
-				       nr_effective, have_cache,
-				       flags, ob);
-		} else {
+		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 open_bucket_add_buckets(struct btree_trans *trans,
+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,
-			unsigned erasure_code,
+			bool erasure_code,
 			unsigned nr_replicas,
 			unsigned *nr_effective,
 			bool *have_cache,
-			enum alloc_reserve reserve,
+			enum bch_watermark watermark,
 			unsigned flags,
 			struct closure *_cl)
 {
@@ -901,107 +947,203 @@ static int open_bucket_add_buckets(struct btree_trans *trans,
 	struct bch_devs_mask devs;
 	struct open_bucket *ob;
 	struct closure *cl = NULL;
-	int ret;
 	unsigned i;
+	int ret;
 
-	rcu_read_lock();
 	devs = target_rw_devs(c, wp->data_type, target);
-	rcu_read_unlock();
 
 	/* 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);
+	darray_for_each(*devs_have, i)
+		__clear_bit(*i, devs.d);
 
 	open_bucket_for_each(c, ptrs, ob, i)
 		__clear_bit(ob->dev, devs.d);
 
-	if (erasure_code) {
-		if (!ec_open_bucket(c, ptrs)) {
-			get_buckets_from_writepoint(c, ptrs, wp, &devs,
-						    nr_replicas, nr_effective,
-						    have_cache, flags, true);
-			if (*nr_effective >= nr_replicas)
-				return 0;
-		}
+	if (erasure_code && ec_open_bucket(c, ptrs))
+		return 0;
 
-		if (!ec_open_bucket(c, ptrs)) {
-			ret = bucket_alloc_from_stripe(trans, ptrs, wp, &devs,
-						 target, erasure_code,
-						 nr_replicas, nr_effective,
-						 have_cache, flags, _cl);
-			if (bch2_err_matches(ret, BCH_ERR_transaction_restart) ||
-			    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 = bucket_alloc_set_writepoint(c, ptrs, wp, &devs,
+				 nr_replicas, nr_effective,
+				 have_cache, erasure_code, flags);
+	if (ret)
+		return ret;
 
-	get_buckets_from_writepoint(c, ptrs, wp, &devs,
-				    nr_replicas, nr_effective,
-				    have_cache, flags, false);
-	if (*nr_effective >= nr_replicas)
-		return 0;
+	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,
-				reserve, flags, 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;
+		/*
+		 * 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;
 }
 
-void bch2_open_buckets_stop_dev(struct bch_fs *c, struct bch_dev *ca,
-				struct open_buckets *obs)
+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)
 {
-	struct open_buckets ptrs = { .nr = 0 };
-	struct open_bucket *ob, *ob2;
-	unsigned i, j;
+	int ret;
 
-	open_bucket_for_each(c, obs, ob, i) {
-		bool drop = !ca || ob->dev == ca->dev_idx;
+	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);
-			for (j = 0; j < ob->ec->new_stripe.key.v.nr_blocks; j++) {
-				if (!ob->ec->blocks[j])
+			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[j];
+				ob2 = c->open_buckets + ob->ec->blocks[i];
 				drop |= ob2->dev == ca->dev_idx;
 			}
 			mutex_unlock(&ob->ec->lock);
 		}
 
-		if (drop)
-			bch2_open_bucket_put(c, ob);
-		else
-			ob_push(c, &ptrs, ob);
+		return drop;
+	} else {
+		return true;
 	}
-
-	*obs = ptrs;
 }
 
-void bch2_writepoint_stop(struct bch_fs *c, struct bch_dev *ca,
-			  struct write_point *wp)
+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);
-	bch2_open_buckets_stop_dev(c, ca, &wp->ptrs);
+	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)
 {
@@ -1047,10 +1189,12 @@ static bool try_increase_writepoints(struct bch_fs *c)
 	return true;
 }
 
-static bool try_decrease_writepoints(struct bch_fs *c,
-				     unsigned old_nr)
+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) {
@@ -1069,19 +1213,14 @@ static bool try_decrease_writepoints(struct bch_fs *c,
 	hlist_del_rcu(&wp->node);
 	mutex_unlock(&c->write_points_hash_lock);
 
-	bch2_writepoint_stop(c, NULL, wp);
+	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 void bch2_trans_mutex_lock_norelock(struct btree_trans *trans,
-				  struct mutex *lock)
-{
-	if (!mutex_trylock(lock)) {
-		bch2_trans_unlock(trans);
-		mutex_lock(lock);
-	}
-}
-
 static struct write_point *writepoint_find(struct btree_trans *trans,
 					   unsigned long write_point)
 {
@@ -1139,6 +1278,30 @@ out:
 	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:
  */
@@ -1149,7 +1312,7 @@ int bch2_alloc_sectors_start_trans(struct btree_trans *trans,
 			     struct bch_devs_list *devs_have,
 			     unsigned nr_replicas,
 			     unsigned nr_replicas_required,
-			     enum alloc_reserve reserve,
+			     enum bch_watermark watermark,
 			     unsigned flags,
 			     struct closure *cl,
 			     struct write_point **wp_ret)
@@ -1159,13 +1322,14 @@ int bch2_alloc_sectors_start_trans(struct btree_trans *trans,
 	struct open_bucket *ob;
 	struct open_buckets ptrs;
 	unsigned nr_effective, write_points_nr;
-	unsigned ob_flags = 0;
 	bool have_cache;
 	int ret;
 	int i;
 
-	if (!(flags & BCH_WRITE_ONLY_SPECIFIED_DEVS))
-		ob_flags |= BUCKET_ALLOC_USE_DURABILITY;
+	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:
@@ -1176,34 +1340,50 @@ retry:
 
 	*wp_ret = wp = writepoint_find(trans, write_point.v);
 
-	if (wp->data_type == BCH_DATA_user)
-		ob_flags |= BUCKET_MAY_ALLOC_PARTIAL;
-
 	/* 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, reserve,
-					      ob_flags, cl);
-	} else {
+	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, reserve,
-					      ob_flags, NULL);
+					      &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, reserve,
-					      ob_flags, cl);
+					      &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);
@@ -1218,9 +1398,12 @@ alloc_done:
 	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, wp, ob);
+		open_bucket_free_unused(c, ob);
 
 	wp->ptrs = ptrs;
 
@@ -1237,13 +1420,13 @@ err:
 		if (ptrs.nr < ARRAY_SIZE(ptrs.v))
 			ob_push(c, &ptrs, ob);
 		else
-			open_bucket_free_unused(c, wp, ob);
+			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(c, write_points_nr))
+	    try_decrease_writepoints(trans, write_points_nr))
 		goto retry;
 
 	if (bch2_err_matches(ret, BCH_ERR_open_buckets_empty) ||
@@ -1331,23 +1514,57 @@ void bch2_fs_allocator_foreground_init(struct bch_fs *c)
 	}
 }
 
+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 ",
+		   ob - c->open_buckets,
+		   atomic_read(&ob->pin));
+	bch2_prt_data_type(out, data_type);
+	prt_printf(out, " %u:%llu gen %u allocated %u/%u",
+		   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) {
-			prt_printf(out, "%zu ref %u type %s %u:%llu:%u\n",
-			       ob - c->open_buckets,
-			       atomic_read(&ob->pin),
-			       bch2_data_types[ob->data_type],
-			       ob->dev, ob->bucket, ob->gen);
-		}
+		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[] = {
@@ -1357,25 +1574,47 @@ static const char * const bch2_write_point_states[] = {
 	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;
-	unsigned i;
 
+	prt_str(out, "Foreground write points\n");
 	for (wp = c->write_points;
 	     wp < c->write_points + ARRAY_SIZE(c->write_points);
-	     wp++) {
-		prt_printf(out, "%lu: ", wp->write_point);
-		prt_human_readable_u64(out, wp->sectors_allocated);
+	     wp++)
+		bch2_write_point_to_text(out, c, wp);
 
-		prt_printf(out, " last wrote: ");
-		bch2_pr_time_units(out, sched_clock() - wp->last_used);
+	prt_str(out, "Copygc write point\n");
+	bch2_write_point_to_text(out, c, &c->copygc_write_point);
 
-		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_str(out, "Rebalance write point\n");
+	bch2_write_point_to_text(out, c, &c->rebalance_write_point);
 
-		prt_newline(out);
-	}
+	prt_str(out, "Btree write point\n");
+	bch2_write_point_to_text(out, c, &c->btree_write_point);
 }