alloc_background.c 34 KB
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// SPDX-License-Identifier: GPL-2.0
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#include "bcachefs.h"
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#include "alloc_background.h"
#include "alloc_foreground.h"
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#include "btree_cache.h"
#include "btree_io.h"
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#include "btree_key_cache.h"
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#include "btree_update.h"
#include "btree_update_interior.h"
#include "btree_gc.h"
#include "buckets.h"
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#include "buckets_waiting_for_journal.h"
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#include "clock.h"
#include "debug.h"
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#include "ec.h"
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#include "error.h"
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#include "lru.h"
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#include "recovery.h"
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#include "trace.h"
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#include "varint.h"
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#include <linux/kthread.h>
#include <linux/math64.h>
#include <linux/random.h>
#include <linux/rculist.h>
#include <linux/rcupdate.h>
#include <linux/sched/task.h>
#include <linux/sort.h>

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/* Persistent alloc info: */

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static const unsigned BCH_ALLOC_V1_FIELD_BYTES[] = {
#define x(name, bits) [BCH_ALLOC_FIELD_V1_##name] = bits / 8,
	BCH_ALLOC_FIELDS_V1()
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#undef x
};

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struct bkey_alloc_unpacked {
	u64		journal_seq;
	u64		bucket;
	u8		dev;
	u8		gen;
	u8		oldest_gen;
	u8		data_type;
	bool		need_discard:1;
	bool		need_inc_gen:1;
#define x(_name, _bits)	u##_bits _name;
	BCH_ALLOC_FIELDS_V2()
#undef  x
};
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static inline u64 alloc_field_v1_get(const struct bch_alloc *a,
				     const void **p, unsigned field)
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{
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	unsigned bytes = BCH_ALLOC_V1_FIELD_BYTES[field];
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	u64 v;

	if (!(a->fields & (1 << field)))
		return 0;

	switch (bytes) {
	case 1:
		v = *((const u8 *) *p);
		break;
	case 2:
		v = le16_to_cpup(*p);
		break;
	case 4:
		v = le32_to_cpup(*p);
		break;
	case 8:
		v = le64_to_cpup(*p);
		break;
	default:
		BUG();
	}

	*p += bytes;
	return v;
}

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static inline void alloc_field_v1_put(struct bkey_i_alloc *a, void **p,
				      unsigned field, u64 v)
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{
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	unsigned bytes = BCH_ALLOC_V1_FIELD_BYTES[field];
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	if (!v)
		return;

	a->v.fields |= 1 << field;

	switch (bytes) {
	case 1:
		*((u8 *) *p) = v;
		break;
	case 2:
		*((__le16 *) *p) = cpu_to_le16(v);
		break;
	case 4:
		*((__le32 *) *p) = cpu_to_le32(v);
		break;
	case 8:
		*((__le64 *) *p) = cpu_to_le64(v);
		break;
	default:
		BUG();
	}

	*p += bytes;
}

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static void bch2_alloc_unpack_v1(struct bkey_alloc_unpacked *out,
				 struct bkey_s_c k)
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{
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	const struct bch_alloc *in = bkey_s_c_to_alloc(k).v;
	const void *d = in->data;
	unsigned idx = 0;
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	out->gen = in->gen;

#define x(_name, _bits) out->_name = alloc_field_v1_get(in, &d, idx++);
	BCH_ALLOC_FIELDS_V1()
#undef  x
}

static int bch2_alloc_unpack_v2(struct bkey_alloc_unpacked *out,
				struct bkey_s_c k)
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{
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	struct bkey_s_c_alloc_v2 a = bkey_s_c_to_alloc_v2(k);
	const u8 *in = a.v->data;
	const u8 *end = bkey_val_end(a);
	unsigned fieldnr = 0;
	int ret;
	u64 v;

	out->gen	= a.v->gen;
	out->oldest_gen	= a.v->oldest_gen;
	out->data_type	= a.v->data_type;

#define x(_name, _bits)							\
	if (fieldnr < a.v->nr_fields) {					\
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		ret = bch2_varint_decode_fast(in, end, &v);		\
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		if (ret < 0)						\
			return ret;					\
		in += ret;						\
	} else {							\
		v = 0;							\
	}								\
	out->_name = v;							\
	if (v != out->_name)						\
		return -1;						\
	fieldnr++;

	BCH_ALLOC_FIELDS_V2()
#undef  x
	return 0;
}

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static int bch2_alloc_unpack_v3(struct bkey_alloc_unpacked *out,
				struct bkey_s_c k)
{
	struct bkey_s_c_alloc_v3 a = bkey_s_c_to_alloc_v3(k);
	const u8 *in = a.v->data;
	const u8 *end = bkey_val_end(a);
	unsigned fieldnr = 0;
	int ret;
	u64 v;

	out->gen	= a.v->gen;
	out->oldest_gen	= a.v->oldest_gen;
	out->data_type	= a.v->data_type;
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	out->need_discard = BCH_ALLOC_V3_NEED_DISCARD(a.v);
	out->need_inc_gen = BCH_ALLOC_V3_NEED_INC_GEN(a.v);
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	out->journal_seq = le64_to_cpu(a.v->journal_seq);

#define x(_name, _bits)							\
	if (fieldnr < a.v->nr_fields) {					\
		ret = bch2_varint_decode_fast(in, end, &v);		\
		if (ret < 0)						\
			return ret;					\
		in += ret;						\
	} else {							\
		v = 0;							\
	}								\
	out->_name = v;							\
	if (v != out->_name)						\
		return -1;						\
	fieldnr++;

	BCH_ALLOC_FIELDS_V2()
#undef  x
	return 0;
}

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static struct bkey_alloc_unpacked bch2_alloc_unpack(struct bkey_s_c k)
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{
	struct bkey_alloc_unpacked ret = {
		.dev	= k.k->p.inode,
		.bucket	= k.k->p.offset,
		.gen	= 0,
	};
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	switch (k.k->type) {
	case KEY_TYPE_alloc:
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		bch2_alloc_unpack_v1(&ret, k);
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		break;
	case KEY_TYPE_alloc_v2:
		bch2_alloc_unpack_v2(&ret, k);
		break;
	case KEY_TYPE_alloc_v3:
		bch2_alloc_unpack_v3(&ret, k);
		break;
	}
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	return ret;
}

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void bch2_alloc_to_v4(struct bkey_s_c k, struct bch_alloc_v4 *out)
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{
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	if (k.k->type == KEY_TYPE_alloc_v4) {
		*out = *bkey_s_c_to_alloc_v4(k).v;
	} else {
		struct bkey_alloc_unpacked u = bch2_alloc_unpack(k);

		*out = (struct bch_alloc_v4) {
			.journal_seq		= u.journal_seq,
			.flags			= u.need_discard,
			.gen			= u.gen,
			.oldest_gen		= u.oldest_gen,
			.data_type		= u.data_type,
			.stripe_redundancy	= u.stripe_redundancy,
			.dirty_sectors		= u.dirty_sectors,
			.cached_sectors		= u.cached_sectors,
			.io_time[READ]		= u.read_time,
			.io_time[WRITE]		= u.write_time,
			.stripe			= u.stripe,
		};
	}
}
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struct bkey_i_alloc_v4 *bch2_alloc_to_v4_mut(struct btree_trans *trans, struct bkey_s_c k)
{
	struct bkey_i_alloc_v4 *ret;
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	if (k.k->type == KEY_TYPE_alloc_v4) {
		ret = bch2_trans_kmalloc(trans, bkey_bytes(k.k));
		if (!IS_ERR(ret))
			bkey_reassemble(&ret->k_i, k);
	} else {
		ret = bch2_trans_kmalloc(trans, sizeof(*ret));
		if (!IS_ERR(ret)) {
			bkey_alloc_v4_init(&ret->k_i);
			ret->k.p = k.k->p;
			bch2_alloc_to_v4(k, &ret->v);
		}
	}
	return ret;
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}

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struct bkey_i_alloc_v4 *
bch2_trans_start_alloc_update(struct btree_trans *trans, struct btree_iter *iter,
			      struct bpos pos)
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{
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	struct bkey_s_c k;
	struct bkey_i_alloc_v4 *a;
	int ret;
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	bch2_trans_iter_init(trans, iter, BTREE_ID_alloc, pos,
			     BTREE_ITER_WITH_UPDATES|
			     BTREE_ITER_CACHED|
			     BTREE_ITER_INTENT);
	k = bch2_btree_iter_peek_slot(iter);
	ret = bkey_err(k);
	if (ret) {
		bch2_trans_iter_exit(trans, iter);
		return ERR_PTR(ret);
	}

	a = bch2_alloc_to_v4_mut(trans, k);
	if (IS_ERR(a))
		bch2_trans_iter_exit(trans, iter);
	return a;
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}

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static unsigned bch_alloc_v1_val_u64s(const struct bch_alloc *a)
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{
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	unsigned i, bytes = offsetof(struct bch_alloc, data);
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	for (i = 0; i < ARRAY_SIZE(BCH_ALLOC_V1_FIELD_BYTES); i++)
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		if (a->fields & (1 << i))
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			bytes += BCH_ALLOC_V1_FIELD_BYTES[i];
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	return DIV_ROUND_UP(bytes, sizeof(u64));
}

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int bch2_alloc_v1_invalid(const struct bch_fs *c, struct bkey_s_c k,
			  int rw, struct printbuf *err)
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{
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	struct bkey_s_c_alloc a = bkey_s_c_to_alloc(k);

	/* allow for unknown fields */
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	if (bkey_val_u64s(a.k) < bch_alloc_v1_val_u64s(a.v)) {
		pr_buf(err, "incorrect value size (%zu < %u)",
		       bkey_val_u64s(a.k), bch_alloc_v1_val_u64s(a.v));
		return -EINVAL;
	}
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	return 0;
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}

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int bch2_alloc_v2_invalid(const struct bch_fs *c, struct bkey_s_c k,
			  int rw, struct printbuf *err)
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{
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	struct bkey_alloc_unpacked u;

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	if (bch2_alloc_unpack_v2(&u, k)) {
		pr_buf(err, "unpack error");
		return -EINVAL;
	}
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	return 0;
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}

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int bch2_alloc_v3_invalid(const struct bch_fs *c, struct bkey_s_c k,
			  int rw, struct printbuf *err)
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{
	struct bkey_alloc_unpacked u;
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	if (bch2_alloc_unpack_v3(&u, k)) {
		pr_buf(err, "unpack error");
		return -EINVAL;
	}
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	return 0;
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}

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int bch2_alloc_v4_invalid(const struct bch_fs *c, struct bkey_s_c k,
			  int rw, struct printbuf *err)
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{
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	struct bkey_s_c_alloc_v4 a = bkey_s_c_to_alloc_v4(k);

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	if (bkey_val_bytes(k.k) != sizeof(struct bch_alloc_v4)) {
		pr_buf(err, "bad val size (%zu != %zu)",
		       bkey_val_bytes(k.k), sizeof(struct bch_alloc_v4));
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		return -EINVAL;
	}
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348
	if (rw == WRITE) {
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		if (alloc_data_type(*a.v, a.v->data_type) != a.v->data_type) {
			pr_buf(err, "invalid data type (got %u should be %u)",
			       a.v->data_type, alloc_data_type(*a.v, a.v->data_type));
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			return -EINVAL;
		}
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		switch (a.v->data_type) {
		case BCH_DATA_free:
		case BCH_DATA_need_gc_gens:
		case BCH_DATA_need_discard:
			if (a.v->dirty_sectors ||
			    a.v->cached_sectors ||
			    a.v->stripe) {
				pr_buf(err, "empty data type free but have data");
				return -EINVAL;
			}
			break;
		case BCH_DATA_sb:
		case BCH_DATA_journal:
		case BCH_DATA_btree:
		case BCH_DATA_user:
		case BCH_DATA_parity:
			if (!a.v->dirty_sectors) {
				pr_buf(err, "data_type %s but dirty_sectors==0",
				       bch2_data_types[a.v->data_type]);
				return -EINVAL;
			}
			break;
		case BCH_DATA_cached:
			if (!a.v->cached_sectors ||
			    a.v->dirty_sectors ||
			    a.v->stripe) {
				pr_buf(err, "data type inconsistency");
				return -EINVAL;
			}

			if (!a.v->io_time[READ]) {
				pr_buf(err, "cached bucket with read_time == 0");
				return -EINVAL;
			}
			break;
		case BCH_DATA_stripe:
			if (!a.v->stripe) {
				pr_buf(err, "data_type %s but stripe==0",
				       bch2_data_types[a.v->data_type]);
				return -EINVAL;
			}
			break;
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		}
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	}

400
	return 0;
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}

void bch2_alloc_v4_swab(struct bkey_s k)
{
	struct bch_alloc_v4 *a = bkey_s_to_alloc_v4(k).v;

	a->journal_seq		= swab64(a->journal_seq);
	a->flags		= swab32(a->flags);
	a->dirty_sectors	= swab32(a->dirty_sectors);
	a->cached_sectors	= swab32(a->cached_sectors);
	a->io_time[0]		= swab64(a->io_time[0]);
	a->io_time[1]		= swab64(a->io_time[1]);
	a->stripe		= swab32(a->stripe);
	a->nr_external_backpointers = swab32(a->nr_external_backpointers);
}

void bch2_alloc_to_text(struct printbuf *out, struct bch_fs *c, struct bkey_s_c k)
{
	struct bch_alloc_v4 a;

	bch2_alloc_to_v4(k, &a);

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	pr_buf(out, "gen %u oldest_gen %u data_type %s journal_seq %llu need_discard %llu need_inc_gen %llu",
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	       a.gen, a.oldest_gen, bch2_data_types[a.data_type],
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	       a.journal_seq,
	       BCH_ALLOC_V4_NEED_DISCARD(&a),
	       BCH_ALLOC_V4_NEED_INC_GEN(&a));
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	pr_buf(out, " dirty_sectors %u",	a.dirty_sectors);
	pr_buf(out, " cached_sectors %u",	a.cached_sectors);
	pr_buf(out, " stripe %u",		a.stripe);
	pr_buf(out, " stripe_redundancy %u",	a.stripe_redundancy);
	pr_buf(out, " read_time %llu",		a.io_time[READ]);
	pr_buf(out, " write_time %llu",		a.io_time[WRITE]);
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}

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int bch2_alloc_read(struct bch_fs *c)
437
{
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	struct btree_trans trans;
	struct btree_iter iter;
	struct bkey_s_c k;
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	struct bch_alloc_v4 a;
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	struct bch_dev *ca;
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	int ret;
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445
	bch2_trans_init(&trans, c, 0, 0);
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	for_each_btree_key(&trans, iter, BTREE_ID_alloc, POS_MIN,
			   BTREE_ITER_PREFETCH, k, ret) {
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		/*
		 * Not a fsck error because this is checked/repaired by
		 * bch2_check_alloc_key() which runs later:
		 */
		if (!bch2_dev_bucket_exists(c, k.k->p))
			continue;

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		ca = bch_dev_bkey_exists(c, k.k->p.inode);
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		bch2_alloc_to_v4(k, &a);
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		*bucket_gen(ca, k.k->p.offset) = a.gen;
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	}
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	bch2_trans_iter_exit(&trans, &iter);
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	bch2_trans_exit(&trans);
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	if (ret)
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		bch_err(c, "error reading alloc info: %i", ret);
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	return ret;
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}

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/* Free space/discard btree: */

static int bch2_bucket_do_index(struct btree_trans *trans,
				struct bkey_s_c alloc_k,
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				const struct bch_alloc_v4 *a,
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				bool set)
{
	struct bch_fs *c = trans->c;
	struct bch_dev *ca = bch_dev_bkey_exists(c, alloc_k.k->p.inode);
	struct btree_iter iter;
	struct bkey_s_c old;
	struct bkey_i *k;
	enum btree_id btree;
	enum bch_bkey_type old_type = !set ? KEY_TYPE_set : KEY_TYPE_deleted;
	enum bch_bkey_type new_type =  set ? KEY_TYPE_set : KEY_TYPE_deleted;
	struct printbuf buf = PRINTBUF;
	int ret;

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	if (a->data_type != BCH_DATA_free &&
	    a->data_type != BCH_DATA_need_discard)
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		return 0;

	k = bch2_trans_kmalloc(trans, sizeof(*k));
	if (IS_ERR(k))
		return PTR_ERR(k);

	bkey_init(&k->k);
	k->k.type = new_type;

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	switch (a->data_type) {
	case BCH_DATA_free:
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		btree = BTREE_ID_freespace;
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		k->k.p = alloc_freespace_pos(alloc_k.k->p, *a);
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		bch2_key_resize(&k->k, 1);
		break;
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	case BCH_DATA_need_discard:
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		btree = BTREE_ID_need_discard;
		k->k.p = alloc_k.k->p;
		break;
	default:
		return 0;
	}

	bch2_trans_iter_init(trans, &iter, btree,
			     bkey_start_pos(&k->k),
			     BTREE_ITER_INTENT);
	old = bch2_btree_iter_peek_slot(&iter);
	ret = bkey_err(old);
	if (ret)
		goto err;

	if (ca->mi.freespace_initialized &&
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	    bch2_trans_inconsistent_on(old.k->type != old_type, trans,
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			"incorrect key when %s %s btree (got %s should be %s)\n"
			"  for %s",
			set ? "setting" : "clearing",
			bch2_btree_ids[btree],
			bch2_bkey_types[old.k->type],
			bch2_bkey_types[old_type],
			(bch2_bkey_val_to_text(&buf, c, alloc_k), buf.buf))) {
		ret = -EIO;
		goto err;
	}

	ret = bch2_trans_update(trans, &iter, k, 0);
err:
	bch2_trans_iter_exit(trans, &iter);
	printbuf_exit(&buf);
	return ret;
}

int bch2_trans_mark_alloc(struct btree_trans *trans,
			  struct bkey_s_c old, struct bkey_i *new,
			  unsigned flags)
{
	struct bch_fs *c = trans->c;
	struct bch_alloc_v4 old_a, *new_a;
	u64 old_lru, new_lru;
	int ret = 0;

	/*
	 * Deletion only happens in the device removal path, with
	 * BTREE_TRIGGER_NORUN:
	 */
	BUG_ON(new->k.type != KEY_TYPE_alloc_v4);

	bch2_alloc_to_v4(old, &old_a);
	new_a = &bkey_i_to_alloc_v4(new)->v;

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	new_a->data_type = alloc_data_type(*new_a, new_a->data_type);

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	if (new_a->dirty_sectors > old_a.dirty_sectors ||
	    new_a->cached_sectors > old_a.cached_sectors) {
		new_a->io_time[READ] = max_t(u64, 1, atomic64_read(&c->io_clock[READ].now));
		new_a->io_time[WRITE]= max_t(u64, 1, atomic64_read(&c->io_clock[WRITE].now));
		SET_BCH_ALLOC_V4_NEED_INC_GEN(new_a, true);
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		SET_BCH_ALLOC_V4_NEED_DISCARD(new_a, true);
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	}

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	if (data_type_is_empty(new_a->data_type) &&
	    BCH_ALLOC_V4_NEED_INC_GEN(new_a) &&
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	    !bch2_bucket_is_open_safe(c, new->k.p.inode, new->k.p.offset)) {
		new_a->gen++;
		SET_BCH_ALLOC_V4_NEED_INC_GEN(new_a, false);
	}

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	if (old_a.data_type != new_a->data_type ||
	    (new_a->data_type == BCH_DATA_free &&
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	     alloc_freespace_genbits(old_a) != alloc_freespace_genbits(*new_a))) {
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		ret =   bch2_bucket_do_index(trans, old, &old_a, false) ?:
			bch2_bucket_do_index(trans, bkey_i_to_s_c(new), new_a, true);
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		if (ret)
			return ret;
	}

	old_lru = alloc_lru_idx(old_a);
	new_lru = alloc_lru_idx(*new_a);

	if (old_lru != new_lru) {
		ret = bch2_lru_change(trans, new->k.p.inode, new->k.p.offset,
				      old_lru, &new_lru);
		if (ret)
			return ret;

		if (new_lru && new_a->io_time[READ] != new_lru)
			new_a->io_time[READ] = new_lru;
	}

	return 0;
}

602 603 604 605
static int bch2_check_alloc_key(struct btree_trans *trans,
				struct btree_iter *alloc_iter)
{
	struct bch_fs *c = trans->c;
606
	struct bch_dev *ca;
607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622
	struct btree_iter discard_iter, freespace_iter;
	struct bch_alloc_v4 a;
	unsigned discard_key_type, freespace_key_type;
	struct bkey_s_c alloc_k, k;
	struct printbuf buf = PRINTBUF;
	struct printbuf buf2 = PRINTBUF;
	int ret;

	alloc_k = bch2_btree_iter_peek(alloc_iter);
	if (!alloc_k.k)
		return 0;

	ret = bkey_err(alloc_k);
	if (ret)
		return ret;

623
	if (fsck_err_on(!bch2_dev_bucket_exists(c, alloc_k.k->p), c,
624 625
			"alloc key for invalid device:bucket %llu:%llu",
			alloc_k.k->p.inode, alloc_k.k->p.offset))
626 627 628 629 630 631
		return bch2_btree_delete_at(trans, alloc_iter, 0);

	ca = bch_dev_bkey_exists(c, alloc_k.k->p.inode);
	if (!ca->mi.freespace_initialized)
		return 0;

632
	bch2_alloc_to_v4(alloc_k, &a);
633

634
	discard_key_type = a.data_type == BCH_DATA_need_discard
635
		? KEY_TYPE_set : 0;
636
	freespace_key_type = a.data_type == BCH_DATA_free
637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707
		? KEY_TYPE_set : 0;

	bch2_trans_iter_init(trans, &discard_iter, BTREE_ID_need_discard,
			     alloc_k.k->p, 0);
	bch2_trans_iter_init(trans, &freespace_iter, BTREE_ID_freespace,
			     alloc_freespace_pos(alloc_k.k->p, a), 0);

	k = bch2_btree_iter_peek_slot(&discard_iter);
	ret = bkey_err(k);
	if (ret)
		goto err;

	if (fsck_err_on(k.k->type != discard_key_type, c,
			"incorrect key in need_discard btree (got %s should be %s)\n"
			"  %s",
			bch2_bkey_types[k.k->type],
			bch2_bkey_types[discard_key_type],
			(bch2_bkey_val_to_text(&buf, c, alloc_k), buf.buf))) {
		struct bkey_i *update =
			bch2_trans_kmalloc(trans, sizeof(*update));

		ret = PTR_ERR_OR_ZERO(update);
		if (ret)
			goto err;

		bkey_init(&update->k);
		update->k.type	= discard_key_type;
		update->k.p	= discard_iter.pos;

		ret = bch2_trans_update(trans, &discard_iter, update, 0);
		if (ret)
			goto err;
	}

	k = bch2_btree_iter_peek_slot(&freespace_iter);
	ret = bkey_err(k);
	if (ret)
		goto err;

	if (fsck_err_on(k.k->type != freespace_key_type, c,
			"incorrect key in freespace btree (got %s should be %s)\n"
			"  %s",
			bch2_bkey_types[k.k->type],
			bch2_bkey_types[freespace_key_type],
			(printbuf_reset(&buf),
			 bch2_bkey_val_to_text(&buf, c, alloc_k), buf.buf))) {
		struct bkey_i *update =
			bch2_trans_kmalloc(trans, sizeof(*update));

		ret = PTR_ERR_OR_ZERO(update);
		if (ret)
			goto err;

		bkey_init(&update->k);
		update->k.type	= freespace_key_type;
		update->k.p	= freespace_iter.pos;
		bch2_key_resize(&update->k, 1);

		ret = bch2_trans_update(trans, &freespace_iter, update, 0);
		if (ret)
			goto err;
	}
err:
fsck_err:
	bch2_trans_iter_exit(trans, &freespace_iter);
	bch2_trans_iter_exit(trans, &discard_iter);
	printbuf_exit(&buf2);
	printbuf_exit(&buf);
	return ret;
}

708 709
static int bch2_check_discard_freespace_key(struct btree_trans *trans,
					    struct btree_iter *iter)
710 711 712 713 714 715 716
{
	struct bch_fs *c = trans->c;
	struct btree_iter alloc_iter;
	struct bkey_s_c k, freespace_k;
	struct bch_alloc_v4 a;
	u64 genbits;
	struct bpos pos;
717 718 719
	enum bch_data_type state = iter->btree_id == BTREE_ID_need_discard
		? BCH_DATA_need_discard
		: BCH_DATA_free;
720 721 722
	struct printbuf buf = PRINTBUF;
	int ret;

723
	freespace_k = bch2_btree_iter_peek(iter);
724 725 726 727 728 729 730
	if (!freespace_k.k)
		return 1;

	ret = bkey_err(freespace_k);
	if (ret)
		return ret;

731
	pos = iter->pos;
732
	pos.offset &= ~(~0ULL << 56);
733
	genbits = iter->pos.offset & (~0ULL << 56);
734 735 736 737

	bch2_trans_iter_init(trans, &alloc_iter, BTREE_ID_alloc, pos, 0);

	if (fsck_err_on(!bch2_dev_bucket_exists(c, pos), c,
738 739
			"entry in %s btree for nonexistant dev:bucket %llu:%llu",
			bch2_btree_ids[iter->btree_id], pos.inode, pos.offset))
740 741 742 743 744 745 746 747 748
		goto delete;

	k = bch2_btree_iter_peek_slot(&alloc_iter);
	ret = bkey_err(k);
	if (ret)
		goto err;

	bch2_alloc_to_v4(k, &a);

749 750
	if (fsck_err_on(a.data_type != state ||
			(state == BCH_DATA_free &&
751 752
			 genbits != alloc_freespace_genbits(a)), c,
			"%s\n  incorrectly set in %s index (free %u, genbits %llu should be %llu)",
753
			(bch2_bkey_val_to_text(&buf, c, k), buf.buf),
754
			bch2_btree_ids[iter->btree_id],
755
			a.data_type == state,
756 757 758 759 760 761 762 763 764
			genbits >> 56, alloc_freespace_genbits(a) >> 56))
		goto delete;
out:
err:
fsck_err:
	bch2_trans_iter_exit(trans, &alloc_iter);
	printbuf_exit(&buf);
	return ret;
delete:
765 766
	ret = bch2_btree_delete_extent_at(trans, iter,
			iter->btree_id == BTREE_ID_freespace ? 1 : 0, 0);
767 768 769
	goto out;
}

770
int bch2_check_alloc_info(struct bch_fs *c)
771 772 773 774
{
	struct btree_trans trans;
	struct btree_iter iter;
	struct bkey_s_c k;
775
	int ret = 0;
776 777 778 779 780

	bch2_trans_init(&trans, c, 0, 0);

	for_each_btree_key(&trans, iter, BTREE_ID_alloc, POS_MIN,
			   BTREE_ITER_PREFETCH, k, ret) {
781 782 783 784 785 786
		ret = __bch2_trans_do(&trans, NULL, NULL, 0,
			bch2_check_alloc_key(&trans, &iter));
		if (ret)
			break;
	}
	bch2_trans_iter_exit(&trans, &iter);
787

788 789
	if (ret)
		goto err;
790

791 792 793
	bch2_trans_iter_init(&trans, &iter, BTREE_ID_need_discard, POS_MIN,
			     BTREE_ITER_PREFETCH);
	while (1) {
794
		ret = __bch2_trans_do(&trans, NULL, NULL, 0,
795
			bch2_check_discard_freespace_key(&trans, &iter));
796 797
		if (ret)
			break;
798 799

		bch2_btree_iter_set_pos(&iter, bpos_nosnap_successor(iter.pos));
800 801 802 803 804 805 806 807 808 809
	}
	bch2_trans_iter_exit(&trans, &iter);

	if (ret)
		goto err;

	bch2_trans_iter_init(&trans, &iter, BTREE_ID_freespace, POS_MIN,
			     BTREE_ITER_PREFETCH);
	while (1) {
		ret = __bch2_trans_do(&trans, NULL, NULL, 0,
810
			bch2_check_discard_freespace_key(&trans, &iter));
811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842
		if (ret)
			break;

		bch2_btree_iter_set_pos(&iter, bpos_nosnap_successor(iter.pos));
	}
	bch2_trans_iter_exit(&trans, &iter);
err:
	bch2_trans_exit(&trans);
	return ret < 0 ? ret : 0;
}

static int bch2_check_alloc_to_lru_ref(struct btree_trans *trans,
				       struct btree_iter *alloc_iter)
{
	struct bch_fs *c = trans->c;
	struct btree_iter lru_iter;
	struct bch_alloc_v4 a;
	struct bkey_s_c alloc_k, k;
	struct printbuf buf = PRINTBUF;
	struct printbuf buf2 = PRINTBUF;
	int ret;

	alloc_k = bch2_btree_iter_peek(alloc_iter);
	if (!alloc_k.k)
		return 0;

	ret = bkey_err(alloc_k);
	if (ret)
		return ret;

	bch2_alloc_to_v4(alloc_k, &a);

843
	if (a.data_type != BCH_DATA_cached)
844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924
		return 0;

	bch2_trans_iter_init(trans, &lru_iter, BTREE_ID_lru,
			     POS(alloc_k.k->p.inode, a.io_time[READ]), 0);

	k = bch2_btree_iter_peek_slot(&lru_iter);
	ret = bkey_err(k);
	if (ret)
		goto err;

	if (fsck_err_on(!a.io_time[READ], c,
			"cached bucket with read_time 0\n"
			"  %s",
		(printbuf_reset(&buf),
		 bch2_bkey_val_to_text(&buf, c, alloc_k), buf.buf)) ||
	    fsck_err_on(k.k->type != KEY_TYPE_lru ||
			le64_to_cpu(bkey_s_c_to_lru(k).v->idx) != alloc_k.k->p.offset, c,
			"incorrect/missing lru entry\n"
			"  %s\n"
			"  %s",
			(printbuf_reset(&buf),
			 bch2_bkey_val_to_text(&buf, c, alloc_k), buf.buf),
			(bch2_bkey_val_to_text(&buf2, c, k), buf2.buf))) {
		u64 read_time = a.io_time[READ];

		if (!a.io_time[READ])
			a.io_time[READ] = atomic64_read(&c->io_clock[READ].now);

		ret = bch2_lru_change(trans,
				      alloc_k.k->p.inode,
				      alloc_k.k->p.offset,
				      0, &a.io_time[READ]);
		if (ret)
			goto err;

		if (a.io_time[READ] != read_time) {
			struct bkey_i_alloc_v4 *a_mut =
				bch2_alloc_to_v4_mut(trans, alloc_k);
			ret = PTR_ERR_OR_ZERO(a_mut);
			if (ret)
				goto err;

			a_mut->v.io_time[READ] = a.io_time[READ];
			ret = bch2_trans_update(trans, alloc_iter,
						&a_mut->k_i, BTREE_TRIGGER_NORUN);
			if (ret)
				goto err;
		}
	}
err:
fsck_err:
	bch2_trans_iter_exit(trans, &lru_iter);
	printbuf_exit(&buf2);
	printbuf_exit(&buf);
	return ret;
}

int bch2_check_alloc_to_lru_refs(struct bch_fs *c)
{
	struct btree_trans trans;
	struct btree_iter iter;
	struct bkey_s_c k;
	int ret = 0;

	bch2_trans_init(&trans, c, 0, 0);

	for_each_btree_key(&trans, iter, BTREE_ID_alloc, POS_MIN,
			   BTREE_ITER_PREFETCH, k, ret) {
		ret = __bch2_trans_do(&trans, NULL, NULL,
				      BTREE_INSERT_NOFAIL|
				      BTREE_INSERT_LAZY_RW,
			bch2_check_alloc_to_lru_ref(&trans, &iter));
		if (ret)
			break;
	}
	bch2_trans_iter_exit(&trans, &iter);

	bch2_trans_exit(&trans);
	return ret < 0 ? ret : 0;
}

925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952
static int bch2_clear_need_discard(struct btree_trans *trans, struct bpos pos,
				   struct bch_dev *ca, bool *discard_done)
{
	struct bch_fs *c = trans->c;
	struct btree_iter iter;
	struct bkey_s_c k;
	struct bkey_i_alloc_v4 *a;
	struct printbuf buf = PRINTBUF;
	int ret;

	bch2_trans_iter_init(trans, &iter, BTREE_ID_alloc, pos,
			     BTREE_ITER_CACHED);
	k = bch2_btree_iter_peek_slot(&iter);
	ret = bkey_err(k);
	if (ret)
		goto out;

	a = bch2_alloc_to_v4_mut(trans, k);
	ret = PTR_ERR_OR_ZERO(a);
	if (ret)
		goto out;

	if (BCH_ALLOC_V4_NEED_INC_GEN(&a->v)) {
		a->v.gen++;
		SET_BCH_ALLOC_V4_NEED_INC_GEN(&a->v, false);
		goto write;
	}

953
	if (bch2_trans_inconsistent_on(a->v.journal_seq > c->journal.flushed_seq_ondisk, trans,
954 955 956 957 958 959 960 961
			"clearing need_discard but journal_seq %llu > flushed_seq %llu\n"
			"%s",
			a->v.journal_seq,
			c->journal.flushed_seq_ondisk,
			(bch2_bkey_val_to_text(&buf, c, k), buf.buf))) {
		ret = -EIO;
		goto out;
	}
962

963
	if (bch2_trans_inconsistent_on(a->v.data_type != BCH_DATA_need_discard, trans,
964 965
			"bucket incorrectly set in need_discard btree\n"
			"%s",
966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988
			(bch2_bkey_val_to_text(&buf, c, k), buf.buf))) {
		ret = -EIO;
		goto out;
	}

	if (!*discard_done && ca->mi.discard && !c->opts.nochanges) {
		/*
		 * This works without any other locks because this is the only
		 * thread that removes items from the need_discard tree
		 */
		bch2_trans_unlock(trans);
		blkdev_issue_discard(ca->disk_sb.bdev,
				     k.k->p.offset * ca->mi.bucket_size,
				     ca->mi.bucket_size,
				     GFP_KERNEL);
		*discard_done = true;

		ret = bch2_trans_relock(trans) ? 0 : -EINTR;
		if (ret)
			goto out;
	}

	SET_BCH_ALLOC_V4_NEED_DISCARD(&a->v, false);
989
	a->v.data_type = alloc_data_type(a->v, a->v.data_type);
990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072
write:
	ret = bch2_trans_update(trans, &iter, &a->k_i, 0);
out:
	bch2_trans_iter_exit(trans, &iter);
	printbuf_exit(&buf);
	return ret;
}

static void bch2_do_discards_work(struct work_struct *work)
{
	struct bch_fs *c = container_of(work, struct bch_fs, discard_work);
	struct bch_dev *ca = NULL;
	struct btree_trans trans;
	struct btree_iter iter;
	struct bkey_s_c k;
	u64 seen = 0, open = 0, need_journal_commit = 0, discarded = 0;
	int ret;

	bch2_trans_init(&trans, c, 0, 0);

	for_each_btree_key(&trans, iter, BTREE_ID_need_discard,
			   POS_MIN, 0, k, ret) {
		bool discard_done = false;

		if (ca && k.k->p.inode != ca->dev_idx) {
			percpu_ref_put(&ca->io_ref);
			ca = NULL;
		}

		if (!ca) {
			ca = bch_dev_bkey_exists(c, k.k->p.inode);
			if (!percpu_ref_tryget(&ca->io_ref)) {
				ca = NULL;
				bch2_btree_iter_set_pos(&iter, POS(k.k->p.inode + 1, 0));
				continue;
			}
		}

		seen++;

		if (bch2_bucket_is_open_safe(c, k.k->p.inode, k.k->p.offset)) {
			open++;
			continue;
		}

		if (bch2_bucket_needs_journal_commit(&c->buckets_waiting_for_journal,
				c->journal.flushed_seq_ondisk,
				k.k->p.inode, k.k->p.offset)) {
			need_journal_commit++;
			continue;
		}

		ret = __bch2_trans_do(&trans, NULL, NULL,
				      BTREE_INSERT_USE_RESERVE|
				      BTREE_INSERT_NOFAIL,
				bch2_clear_need_discard(&trans, k.k->p, ca, &discard_done));
		if (ret)
			break;

		discarded++;
	}
	bch2_trans_iter_exit(&trans, &iter);

	if (ca)
		percpu_ref_put(&ca->io_ref);

	bch2_trans_exit(&trans);

	if (need_journal_commit * 2 > seen)
		bch2_journal_flush_async(&c->journal, NULL);

	percpu_ref_put(&c->writes);

	trace_do_discards(c, seen, open, need_journal_commit, discarded, ret);
}

void bch2_do_discards(struct bch_fs *c)
{
	if (percpu_ref_tryget(&c->writes) &&
	    !queue_work(system_long_wq, &c->discard_work))
		percpu_ref_put(&c->writes);
}

1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091
static int invalidate_one_bucket(struct btree_trans *trans, struct bch_dev *ca)
{
	struct bch_fs *c = trans->c;
	struct btree_iter lru_iter, alloc_iter = { NULL };
	struct bkey_s_c k;
	struct bkey_i_alloc_v4 *a;
	u64 bucket, idx;
	int ret;

	bch2_trans_iter_init(trans, &lru_iter, BTREE_ID_lru,
			     POS(ca->dev_idx, 0), 0);
	k = bch2_btree_iter_peek(&lru_iter);
	ret = bkey_err(k);
	if (ret)
		goto out;

	if (!k.k || k.k->p.inode != ca->dev_idx)
		goto out;

1092 1093
	if (bch2_trans_inconsistent_on(k.k->type != KEY_TYPE_lru, trans,
				       "non lru key in lru btree"))
1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104
		goto out;

	idx	= k.k->p.offset;
	bucket	= le64_to_cpu(bkey_s_c_to_lru(k).v->idx);

	a = bch2_trans_start_alloc_update(trans, &alloc_iter,
					  POS(ca->dev_idx, bucket));
	ret = PTR_ERR_OR_ZERO(a);
	if (ret)
		goto out;

1105
	if (bch2_trans_inconsistent_on(idx != alloc_lru_idx(a->v), trans,
1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135
			"invalidating bucket with wrong lru idx (got %llu should be %llu",
			idx, alloc_lru_idx(a->v)))
		goto out;

	SET_BCH_ALLOC_V4_NEED_INC_GEN(&a->v, false);
	a->v.gen++;
	a->v.data_type		= 0;
	a->v.dirty_sectors	= 0;
	a->v.cached_sectors	= 0;
	a->v.io_time[READ]	= atomic64_read(&c->io_clock[READ].now);
	a->v.io_time[WRITE]	= atomic64_read(&c->io_clock[WRITE].now);

	ret = bch2_trans_update(trans, &alloc_iter, &a->k_i,
				BTREE_TRIGGER_BUCKET_INVALIDATE);
out:
	bch2_trans_iter_exit(trans, &alloc_iter);
	bch2_trans_iter_exit(trans, &lru_iter);
	return ret;
}

static void bch2_do_invalidates_work(struct work_struct *work)
{
	struct bch_fs *c = container_of(work, struct bch_fs, invalidate_work);
	struct bch_dev *ca;
	struct btree_trans trans;
	unsigned i;
	int ret = 0;

	bch2_trans_init(&trans, c, 0, 0);

1136 1137 1138 1139 1140
	for_each_member_device(ca, c, i) {
		s64 nr_to_invalidate =
			should_invalidate_buckets(ca, bch2_dev_usage_read(ca));

		while (!ret && nr_to_invalidate-- >= 0)
1141 1142 1143 1144
			ret = __bch2_trans_do(&trans, NULL, NULL,
					      BTREE_INSERT_USE_RESERVE|
					      BTREE_INSERT_NOFAIL,
					invalidate_one_bucket(&trans, ca));
1145
	}
1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156

	bch2_trans_exit(&trans);
	percpu_ref_put(&c->writes);
}

void bch2_do_invalidates(struct bch_fs *c)
{
	if (percpu_ref_tryget(&c->writes))
		queue_work(system_long_wq, &c->invalidate_work);
}

1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177
static int bch2_dev_freespace_init(struct bch_fs *c, struct bch_dev *ca)
{
	struct btree_trans trans;
	struct btree_iter iter;
	struct bkey_s_c k;
	struct bch_alloc_v4 a;
	struct bch_member *m;
	int ret;

	bch2_trans_init(&trans, c, 0, 0);

	for_each_btree_key(&trans, iter, BTREE_ID_alloc,
			   POS(ca->dev_idx, ca->mi.first_bucket),
			   BTREE_ITER_SLOTS|
			   BTREE_ITER_PREFETCH, k, ret) {
		if (iter.pos.offset >= ca->mi.nbuckets)
			break;

		bch2_alloc_to_v4(k, &a);
		ret = __bch2_trans_do(&trans, NULL, NULL,
				      BTREE_INSERT_LAZY_RW,
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				 bch2_bucket_do_index(&trans, k, &a, true));
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		if (ret)
			break;
	}
	bch2_trans_iter_exit(&trans, &iter);

	bch2_trans_exit(&trans);

	if (ret) {
		bch_err(ca, "error initializing free space: %i", ret);
		return ret;
	}

	mutex_lock(&c->sb_lock);
	m = bch2_sb_get_members(c->disk_sb.sb)->members + ca->dev_idx;
	SET_BCH_MEMBER_FREESPACE_INITIALIZED(m, true);
	mutex_unlock(&c->sb_lock);

	return ret;
}

int bch2_fs_freespace_init(struct bch_fs *c)
{
	struct bch_dev *ca;
	unsigned i;
	int ret = 0;
	bool doing_init = false;

	/*
	 * We can crash during the device add path, so we need to check this on
	 * every mount:
	 */

	for_each_member_device(ca, c, i) {
		if (ca->mi.freespace_initialized)
			continue;

		if (!doing_init) {
			bch_info(c, "initializing freespace");
			doing_init = true;
		}

		ret = bch2_dev_freespace_init(c, ca);
		if (ret) {
			percpu_ref_put(&ca->ref);
			return ret;
		}
	}

	if (doing_init) {
		mutex_lock(&c->sb_lock);
		bch2_write_super(c);
		mutex_unlock(&c->sb_lock);

		bch_verbose(c, "done initializing freespace");
	}

	return ret;
}

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/* Bucket IO clocks: */

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int bch2_bucket_io_time_reset(struct btree_trans *trans, unsigned dev,
			      size_t bucket_nr, int rw)
{
	struct bch_fs *c = trans->c;
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	struct btree_iter iter;
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	struct bkey_i_alloc_v4 *a;
	u64 now;
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	int ret = 0;

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	a = bch2_trans_start_alloc_update(trans, &iter,  POS(dev, bucket_nr));
	ret = PTR_ERR_OR_ZERO(a);
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	if (ret)
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		return ret;
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	now = atomic64_read(&c->io_clock[rw].now);
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	if (a->v.io_time[rw] == now)
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		goto out;

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	a->v.io_time[rw] = now;
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	ret   = bch2_trans_update(trans, &iter, &a->k_i, 0) ?:
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		bch2_trans_commit(trans, NULL, NULL, 0);
out:
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	bch2_trans_iter_exit(trans, &iter);
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	return ret;
}

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/* Startup/shutdown (ro/rw): */

void bch2_recalc_capacity(struct bch_fs *c)
{
	struct bch_dev *ca;
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	u64 capacity = 0, reserved_sectors = 0, gc_reserve;
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	unsigned bucket_size_max = 0;
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	unsigned long ra_pages = 0;
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	unsigned i;
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	lockdep_assert_held(&c->state_lock);

	for_each_online_member(ca, c, i) {
		struct backing_dev_info *bdi = ca->disk_sb.bdev->bd_disk->bdi;

		ra_pages += bdi->ra_pages;
	}

	bch2_set_ra_pages(c, ra_pages);

	for_each_rw_member(ca, c, i) {
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		u64 dev_reserve = 0;
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		/*
		 * We need to reserve buckets (from the number
		 * of currently available buckets) against
		 * foreground writes so that mainly copygc can
		 * make forward progress.
		 *
		 * We need enough to refill the various reserves
		 * from scratch - copygc will use its entire
		 * reserve all at once, then run against when
		 * its reserve is refilled (from the formerly
		 * available buckets).
		 *
		 * This reserve is just used when considering if
		 * allocations for foreground writes must wait -
		 * not -ENOSPC calculations.
		 */
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		dev_reserve += ca->nr_btree_reserve * 2;
		dev_reserve += ca->mi.nbuckets >> 6; /* copygc reserve */
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		dev_reserve += 1;	/* btree write point */
		dev_reserve += 1;	/* copygc write point */
		dev_reserve += 1;	/* rebalance write point */
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		dev_reserve *= ca->mi.bucket_size;
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		capacity += bucket_to_sector(ca, ca->mi.nbuckets -
					     ca->mi.first_bucket);
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		reserved_sectors += dev_reserve * 2;
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		bucket_size_max = max_t(unsigned, bucket_size_max,
					ca->mi.bucket_size);
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	}
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	gc_reserve = c->opts.gc_reserve_bytes
		? c->opts.gc_reserve_bytes >> 9
		: div64_u64(capacity * c->opts.gc_reserve_percent, 100);

	reserved_sectors = max(gc_reserve, reserved_sectors);
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	reserved_sectors = min(reserved_sectors, capacity);
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	c->capacity = capacity - reserved_sectors;
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	c->bucket_size_max = bucket_size_max;

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	/* Wake up case someone was waiting for buckets */
	closure_wake_up(&c->freelist_wait);
}

static bool bch2_dev_has_open_write_point(struct bch_fs *c, struct bch_dev *ca)
{
	struct open_bucket *ob;
	bool ret = false;

	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 &&
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		    ob->dev == ca->dev_idx)
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			ret = true;
		spin_unlock(&ob->lock);
	}

	return ret;
}

/* device goes ro: */
void bch2_dev_allocator_remove(struct bch_fs *c, struct bch_dev *ca)
{
	unsigned i;

	/* First, remove device from allocation groups: */

	for (i = 0; i < ARRAY_SIZE(c->rw_devs); i++)
		clear_bit(ca->dev_idx, c->rw_devs[i].d);

	/*
	 * Capacity is calculated based off of devices in allocation groups:
	 */
	bch2_recalc_capacity(c);

	/* Next, close write points that point to this device... */
	for (i = 0; i < ARRAY_SIZE(c->write_points); i++)
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		bch2_writepoint_stop(c, ca, &c->write_points[i]);
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	bch2_writepoint_stop(c, ca, &c->copygc_write_point);
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	bch2_writepoint_stop(c, ca, &c->rebalance_write_point);
	bch2_writepoint_stop(c, ca, &c->btree_write_point);
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	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];

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		bch2_open_buckets_put(c, &a->ob);
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	}
	mutex_unlock(&c->btree_reserve_cache_lock);

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	while (1) {
		struct open_bucket *ob;

		spin_lock(&c->freelist_lock);
		if (!ca->open_buckets_partial_nr) {
			spin_unlock(&c->freelist_lock);
			break;
		}
		ob = c->open_buckets +
			ca->open_buckets_partial[--ca->open_buckets_partial_nr];
		ob->on_partial_list = false;
		spin_unlock(&c->freelist_lock);

		bch2_open_bucket_put(c, ob);
	}

	bch2_ec_stop_dev(c, ca);

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	/*
	 * Wake up threads that were blocked on allocation, so they can notice
	 * the device can no longer be removed and the capacity has changed:
	 */
	closure_wake_up(&c->freelist_wait);

	/*
	 * journal_res_get() can block waiting for free space in the journal -
	 * it needs to notice there may not be devices to allocate from anymore:
	 */
	wake_up(&c->journal.wait);

	/* Now wait for any in flight writes: */

	closure_wait_event(&c->open_buckets_wait,
			   !bch2_dev_has_open_write_point(c, ca));
}

/* device goes rw: */
void bch2_dev_allocator_add(struct bch_fs *c, struct bch_dev *ca)
{
	unsigned i;

	for (i = 0; i < ARRAY_SIZE(c->rw_devs); i++)
		if (ca->mi.data_allowed & (1 << i))
			set_bit(ca->dev_idx, c->rw_devs[i].d);
}

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void bch2_fs_allocator_background_init(struct bch_fs *c)
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{
	spin_lock_init(&c->freelist_lock);
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	INIT_WORK(&c->discard_work, bch2_do_discards_work);
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	INIT_WORK(&c->invalidate_work, bch2_do_invalidates_work);
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}