--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+#include "bcachefs.h"
+#include "alloc_background.h"
+#include "alloc_foreground.h"
+#include "backpointers.h"
+#include "btree_cache.h"
+#include "btree_io.h"
+#include "btree_key_cache.h"
+#include "btree_update.h"
+#include "btree_update_interior.h"
+#include "btree_gc.h"
+#include "btree_write_buffer.h"
+#include "buckets.h"
+#include "buckets_waiting_for_journal.h"
+#include "clock.h"
+#include "debug.h"
+#include "ec.h"
+#include "error.h"
+#include "lru.h"
+#include "recovery.h"
+#include "trace.h"
+#include "varint.h"
+
+#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>
+
+/* Persistent alloc info: */
+
+static const unsigned BCH_ALLOC_V1_FIELD_BYTES[] = {
+#define x(name, bits) [BCH_ALLOC_FIELD_V1_##name] = bits / 8,
+ BCH_ALLOC_FIELDS_V1()
+#undef x
+};
+
+struct bkey_alloc_unpacked {
+ u64 journal_seq;
+ 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
+};
+
+static inline u64 alloc_field_v1_get(const struct bch_alloc *a,
+ const void **p, unsigned field)
+{
+ unsigned bytes = BCH_ALLOC_V1_FIELD_BYTES[field];
+ 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;
+}
+
+static void bch2_alloc_unpack_v1(struct bkey_alloc_unpacked *out,
+ struct bkey_s_c k)
+{
+ const struct bch_alloc *in = bkey_s_c_to_alloc(k).v;
+ const void *d = in->data;
+ unsigned idx = 0;
+
+ 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)
+{
+ 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) { \
+ 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;
+}
+
+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;
+ out->need_discard = BCH_ALLOC_V3_NEED_DISCARD(a.v);
+ out->need_inc_gen = BCH_ALLOC_V3_NEED_INC_GEN(a.v);
+ 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;
+}
+
+static struct bkey_alloc_unpacked bch2_alloc_unpack(struct bkey_s_c k)
+{
+ struct bkey_alloc_unpacked ret = { .gen = 0 };
+
+ switch (k.k->type) {
+ case KEY_TYPE_alloc:
+ bch2_alloc_unpack_v1(&ret, k);
+ 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;
+ }
+
+ return ret;
+}
+
+static unsigned bch_alloc_v1_val_u64s(const struct bch_alloc *a)
+{
+ unsigned i, bytes = offsetof(struct bch_alloc, data);
+
+ for (i = 0; i < ARRAY_SIZE(BCH_ALLOC_V1_FIELD_BYTES); i++)
+ if (a->fields & (1 << i))
+ bytes += BCH_ALLOC_V1_FIELD_BYTES[i];
+
+ return DIV_ROUND_UP(bytes, sizeof(u64));
+}
+
+int bch2_alloc_v1_invalid(struct bch_fs *c, struct bkey_s_c k,
+ enum bkey_invalid_flags flags,
+ struct printbuf *err)
+{
+ struct bkey_s_c_alloc a = bkey_s_c_to_alloc(k);
+ int ret = 0;
+
+ /* allow for unknown fields */
+ bkey_fsck_err_on(bkey_val_u64s(a.k) < bch_alloc_v1_val_u64s(a.v), c, err,
+ alloc_v1_val_size_bad,
+ "incorrect value size (%zu < %u)",
+ bkey_val_u64s(a.k), bch_alloc_v1_val_u64s(a.v));
+fsck_err:
+ return ret;
+}
+
+int bch2_alloc_v2_invalid(struct bch_fs *c, struct bkey_s_c k,
+ enum bkey_invalid_flags flags,
+ struct printbuf *err)
+{
+ struct bkey_alloc_unpacked u;
+ int ret = 0;
+
+ bkey_fsck_err_on(bch2_alloc_unpack_v2(&u, k), c, err,
+ alloc_v2_unpack_error,
+ "unpack error");
+fsck_err:
+ return ret;
+}
+
+int bch2_alloc_v3_invalid(struct bch_fs *c, struct bkey_s_c k,
+ enum bkey_invalid_flags flags,
+ struct printbuf *err)
+{
+ struct bkey_alloc_unpacked u;
+ int ret = 0;
+
+ bkey_fsck_err_on(bch2_alloc_unpack_v3(&u, k), c, err,
+ alloc_v2_unpack_error,
+ "unpack error");
+fsck_err:
+ return ret;
+}
+
+int bch2_alloc_v4_invalid(struct bch_fs *c, struct bkey_s_c k,
+ enum bkey_invalid_flags flags, struct printbuf *err)
+{
+ struct bkey_s_c_alloc_v4 a = bkey_s_c_to_alloc_v4(k);
+ int ret = 0;
+
+ bkey_fsck_err_on(alloc_v4_u64s(a.v) > bkey_val_u64s(k.k), c, err,
+ alloc_v4_val_size_bad,
+ "bad val size (%u > %zu)",
+ alloc_v4_u64s(a.v), bkey_val_u64s(k.k));
+
+ bkey_fsck_err_on(!BCH_ALLOC_V4_BACKPOINTERS_START(a.v) &&
+ BCH_ALLOC_V4_NR_BACKPOINTERS(a.v), c, err,
+ alloc_v4_backpointers_start_bad,
+ "invalid backpointers_start");
+
+ bkey_fsck_err_on(alloc_data_type(*a.v, a.v->data_type) != a.v->data_type, c, err,
+ alloc_key_data_type_bad,
+ "invalid data type (got %u should be %u)",
+ a.v->data_type, alloc_data_type(*a.v, a.v->data_type));
+
+ switch (a.v->data_type) {
+ case BCH_DATA_free:
+ case BCH_DATA_need_gc_gens:
+ case BCH_DATA_need_discard:
+ bkey_fsck_err_on(bch2_bucket_sectors(*a.v) || a.v->stripe,
+ c, err, alloc_key_empty_but_have_data,
+ "empty data type free but have data");
+ break;
+ case BCH_DATA_sb:
+ case BCH_DATA_journal:
+ case BCH_DATA_btree:
+ case BCH_DATA_user:
+ case BCH_DATA_parity:
+ bkey_fsck_err_on(!bch2_bucket_sectors_dirty(*a.v),
+ c, err, alloc_key_dirty_sectors_0,
+ "data_type %s but dirty_sectors==0",
+ bch2_data_types[a.v->data_type]);
+ break;
+ case BCH_DATA_cached:
+ bkey_fsck_err_on(!a.v->cached_sectors ||
+ bch2_bucket_sectors_dirty(*a.v) ||
+ a.v->stripe,
+ c, err, alloc_key_cached_inconsistency,
+ "data type inconsistency");
+
+ bkey_fsck_err_on(!a.v->io_time[READ] &&
+ c->curr_recovery_pass > BCH_RECOVERY_PASS_check_alloc_to_lru_refs,
+ c, err, alloc_key_cached_but_read_time_zero,
+ "cached bucket with read_time == 0");
+ break;
+ case BCH_DATA_stripe:
+ break;
+ }
+fsck_err:
+ return ret;
+}
+
+void bch2_alloc_v4_swab(struct bkey_s k)
+{
+ struct bch_alloc_v4 *a = bkey_s_to_alloc_v4(k).v;
+ struct bch_backpointer *bp, *bps;
+
+ 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);
+ a->fragmentation_lru = swab64(a->fragmentation_lru);
+
+ bps = alloc_v4_backpointers(a);
+ for (bp = bps; bp < bps + BCH_ALLOC_V4_NR_BACKPOINTERS(a); bp++) {
+ bp->bucket_offset = swab40(bp->bucket_offset);
+ bp->bucket_len = swab32(bp->bucket_len);
+ bch2_bpos_swab(&bp->pos);
+ }
+}
+
+void bch2_alloc_to_text(struct printbuf *out, struct bch_fs *c, struct bkey_s_c k)
+{
+ struct bch_alloc_v4 _a;
+ const struct bch_alloc_v4 *a = bch2_alloc_to_v4(k, &_a);
+ unsigned i;
+
+ prt_newline(out);
+ printbuf_indent_add(out, 2);
+
+ prt_printf(out, "gen %u oldest_gen %u data_type %s",
+ a->gen, a->oldest_gen,
+ a->data_type < BCH_DATA_NR
+ ? bch2_data_types[a->data_type]
+ : "(invalid data type)");
+ prt_newline(out);
+ prt_printf(out, "journal_seq %llu", a->journal_seq);
+ prt_newline(out);
+ prt_printf(out, "need_discard %llu", BCH_ALLOC_V4_NEED_DISCARD(a));
+ prt_newline(out);
+ prt_printf(out, "need_inc_gen %llu", BCH_ALLOC_V4_NEED_INC_GEN(a));
+ prt_newline(out);
+ prt_printf(out, "dirty_sectors %u", a->dirty_sectors);
+ prt_newline(out);
+ prt_printf(out, "cached_sectors %u", a->cached_sectors);
+ prt_newline(out);
+ prt_printf(out, "stripe %u", a->stripe);
+ prt_newline(out);
+ prt_printf(out, "stripe_redundancy %u", a->stripe_redundancy);
+ prt_newline(out);
+ prt_printf(out, "io_time[READ] %llu", a->io_time[READ]);
+ prt_newline(out);
+ prt_printf(out, "io_time[WRITE] %llu", a->io_time[WRITE]);
+ prt_newline(out);
+ prt_printf(out, "fragmentation %llu", a->fragmentation_lru);
+ prt_newline(out);
+ prt_printf(out, "bp_start %llu", BCH_ALLOC_V4_BACKPOINTERS_START(a));
+ prt_newline(out);
+
+ if (BCH_ALLOC_V4_NR_BACKPOINTERS(a)) {
+ struct bkey_s_c_alloc_v4 a_raw = bkey_s_c_to_alloc_v4(k);
+ const struct bch_backpointer *bps = alloc_v4_backpointers_c(a_raw.v);
+
+ prt_printf(out, "backpointers: %llu", BCH_ALLOC_V4_NR_BACKPOINTERS(a_raw.v));
+ printbuf_indent_add(out, 2);
+
+ for (i = 0; i < BCH_ALLOC_V4_NR_BACKPOINTERS(a_raw.v); i++) {
+ prt_newline(out);
+ bch2_backpointer_to_text(out, &bps[i]);
+ }
+
+ printbuf_indent_sub(out, 2);
+ }
+
+ printbuf_indent_sub(out, 2);
+}
+
+void __bch2_alloc_to_v4(struct bkey_s_c k, struct bch_alloc_v4 *out)
+{
+ if (k.k->type == KEY_TYPE_alloc_v4) {
+ void *src, *dst;
+
+ *out = *bkey_s_c_to_alloc_v4(k).v;
+
+ src = alloc_v4_backpointers(out);
+ SET_BCH_ALLOC_V4_BACKPOINTERS_START(out, BCH_ALLOC_V4_U64s);
+ dst = alloc_v4_backpointers(out);
+
+ if (src < dst)
+ memset(src, 0, dst - src);
+
+ SET_BCH_ALLOC_V4_NR_BACKPOINTERS(out, 0);
+ } 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,
+ };
+
+ SET_BCH_ALLOC_V4_BACKPOINTERS_START(out, BCH_ALLOC_V4_U64s);
+ }
+}
+
+static noinline 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;
+
+ ret = bch2_trans_kmalloc(trans, max(bkey_bytes(k.k), sizeof(struct bkey_i_alloc_v4)));
+ if (IS_ERR(ret))
+ return ret;
+
+ if (k.k->type == KEY_TYPE_alloc_v4) {
+ void *src, *dst;
+
+ bkey_reassemble(&ret->k_i, k);
+
+ src = alloc_v4_backpointers(&ret->v);
+ SET_BCH_ALLOC_V4_BACKPOINTERS_START(&ret->v, BCH_ALLOC_V4_U64s);
+ dst = alloc_v4_backpointers(&ret->v);
+
+ if (src < dst)
+ memset(src, 0, dst - src);
+
+ SET_BCH_ALLOC_V4_NR_BACKPOINTERS(&ret->v, 0);
+ set_alloc_v4_u64s(ret);
+ } else {
+ bkey_alloc_v4_init(&ret->k_i);
+ ret->k.p = k.k->p;
+ bch2_alloc_to_v4(k, &ret->v);
+ }
+ return ret;
+}
+
+static inline struct bkey_i_alloc_v4 *bch2_alloc_to_v4_mut_inlined(struct btree_trans *trans, struct bkey_s_c k)
+{
+ struct bkey_s_c_alloc_v4 a;
+
+ if (likely(k.k->type == KEY_TYPE_alloc_v4) &&
+ ((a = bkey_s_c_to_alloc_v4(k), true) &&
+ BCH_ALLOC_V4_NR_BACKPOINTERS(a.v) == 0))
+ return bch2_bkey_make_mut_noupdate_typed(trans, k, alloc_v4);
+
+ return __bch2_alloc_to_v4_mut(trans, k);
+}
+
+struct bkey_i_alloc_v4 *bch2_alloc_to_v4_mut(struct btree_trans *trans, struct bkey_s_c k)
+{
+ return bch2_alloc_to_v4_mut_inlined(trans, k);
+}
+
+struct bkey_i_alloc_v4 *
+bch2_trans_start_alloc_update(struct btree_trans *trans, struct btree_iter *iter,
+ struct bpos pos)
+{
+ struct bkey_s_c k;
+ struct bkey_i_alloc_v4 *a;
+ int ret;
+
+ k = bch2_bkey_get_iter(trans, iter, BTREE_ID_alloc, pos,
+ BTREE_ITER_WITH_UPDATES|
+ BTREE_ITER_CACHED|
+ BTREE_ITER_INTENT);
+ ret = bkey_err(k);
+ if (unlikely(ret))
+ return ERR_PTR(ret);
+
+ a = bch2_alloc_to_v4_mut_inlined(trans, k);
+ ret = PTR_ERR_OR_ZERO(a);
+ if (unlikely(ret))
+ goto err;
+ return a;
+err:
+ bch2_trans_iter_exit(trans, iter);
+ return ERR_PTR(ret);
+}
+
+static struct bpos alloc_gens_pos(struct bpos pos, unsigned *offset)
+{
+ *offset = pos.offset & KEY_TYPE_BUCKET_GENS_MASK;
+
+ pos.offset >>= KEY_TYPE_BUCKET_GENS_BITS;
+ return pos;
+}
+
+static struct bpos bucket_gens_pos_to_alloc(struct bpos pos, unsigned offset)
+{
+ pos.offset <<= KEY_TYPE_BUCKET_GENS_BITS;
+ pos.offset += offset;
+ return pos;
+}
+
+static unsigned alloc_gen(struct bkey_s_c k, unsigned offset)
+{
+ return k.k->type == KEY_TYPE_bucket_gens
+ ? bkey_s_c_to_bucket_gens(k).v->gens[offset]
+ : 0;
+}
+
+int bch2_bucket_gens_invalid(struct bch_fs *c, struct bkey_s_c k,
+ enum bkey_invalid_flags flags,
+ struct printbuf *err)
+{
+ int ret = 0;
+
+ bkey_fsck_err_on(bkey_val_bytes(k.k) != sizeof(struct bch_bucket_gens), c, err,
+ bucket_gens_val_size_bad,
+ "bad val size (%zu != %zu)",
+ bkey_val_bytes(k.k), sizeof(struct bch_bucket_gens));
+fsck_err:
+ return ret;
+}
+
+void bch2_bucket_gens_to_text(struct printbuf *out, struct bch_fs *c, struct bkey_s_c k)
+{
+ struct bkey_s_c_bucket_gens g = bkey_s_c_to_bucket_gens(k);
+ unsigned i;
+
+ for (i = 0; i < ARRAY_SIZE(g.v->gens); i++) {
+ if (i)
+ prt_char(out, ' ');
+ prt_printf(out, "%u", g.v->gens[i]);
+ }
+}
+
+int bch2_bucket_gens_init(struct bch_fs *c)
+{
+ struct btree_trans *trans = bch2_trans_get(c);
+ struct bkey_i_bucket_gens g;
+ bool have_bucket_gens_key = false;
+ int ret;
+
+ ret = for_each_btree_key(trans, iter, BTREE_ID_alloc, POS_MIN,
+ BTREE_ITER_PREFETCH, k, ({
+ /*
+ * 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;
+
+ struct bch_alloc_v4 a;
+ u8 gen = bch2_alloc_to_v4(k, &a)->gen;
+ unsigned offset;
+ struct bpos pos = alloc_gens_pos(iter.pos, &offset);
+
+ if (have_bucket_gens_key && bkey_cmp(iter.pos, pos)) {
+ ret = commit_do(trans, NULL, NULL,
+ BCH_TRANS_COMMIT_no_enospc,
+ bch2_btree_insert_trans(trans, BTREE_ID_bucket_gens, &g.k_i, 0));
+ if (ret)
+ break;
+ have_bucket_gens_key = false;
+ }
+
+ if (!have_bucket_gens_key) {
+ bkey_bucket_gens_init(&g.k_i);
+ g.k.p = pos;
+ have_bucket_gens_key = true;
+ }
+
+ g.v.gens[offset] = gen;
+ 0;
+ }));
+
+ if (have_bucket_gens_key && !ret)
+ ret = commit_do(trans, NULL, NULL,
+ BCH_TRANS_COMMIT_no_enospc,
+ bch2_btree_insert_trans(trans, BTREE_ID_bucket_gens, &g.k_i, 0));
+
+ bch2_trans_put(trans);
+
+ bch_err_fn(c, ret);
+ return ret;
+}
+
+int bch2_alloc_read(struct bch_fs *c)
+{
+ struct btree_trans *trans = bch2_trans_get(c);
+ int ret;
+
+ down_read(&c->gc_lock);
+
+ if (c->sb.version_upgrade_complete >= bcachefs_metadata_version_bucket_gens) {
+ ret = for_each_btree_key(trans, iter, BTREE_ID_bucket_gens, POS_MIN,
+ BTREE_ITER_PREFETCH, k, ({
+ u64 start = bucket_gens_pos_to_alloc(k.k->p, 0).offset;
+ u64 end = bucket_gens_pos_to_alloc(bpos_nosnap_successor(k.k->p), 0).offset;
+
+ if (k.k->type != KEY_TYPE_bucket_gens)
+ continue;
+
+ const struct bch_bucket_gens *g = bkey_s_c_to_bucket_gens(k).v;
+
+ /*
+ * Not a fsck error because this is checked/repaired by
+ * bch2_check_alloc_key() which runs later:
+ */
+ if (!bch2_dev_exists2(c, k.k->p.inode))
+ continue;
+
+ struct bch_dev *ca = bch_dev_bkey_exists(c, k.k->p.inode);
+
+ for (u64 b = max_t(u64, ca->mi.first_bucket, start);
+ b < min_t(u64, ca->mi.nbuckets, end);
+ b++)
+ *bucket_gen(ca, b) = g->gens[b & KEY_TYPE_BUCKET_GENS_MASK];
+ 0;
+ }));
+ } else {
+ ret = for_each_btree_key(trans, iter, BTREE_ID_alloc, POS_MIN,
+ BTREE_ITER_PREFETCH, k, ({
+ /*
+ * 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;
+
+ struct bch_dev *ca = bch_dev_bkey_exists(c, k.k->p.inode);
+
+ struct bch_alloc_v4 a;
+ *bucket_gen(ca, k.k->p.offset) = bch2_alloc_to_v4(k, &a)->gen;
+ 0;
+ }));
+ }
+
+ bch2_trans_put(trans);
+ up_read(&c->gc_lock);
+
+ bch_err_fn(c, ret);
+ return ret;
+}
+
+/* Free space/discard btree: */
+
+static int bch2_bucket_do_index(struct btree_trans *trans,
+ struct bkey_s_c alloc_k,
+ const struct bch_alloc_v4 *a,
+ 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;
+
+ if (a->data_type != BCH_DATA_free &&
+ a->data_type != BCH_DATA_need_discard)
+ return 0;
+
+ k = bch2_trans_kmalloc_nomemzero(trans, sizeof(*k));
+ if (IS_ERR(k))
+ return PTR_ERR(k);
+
+ bkey_init(&k->k);
+ k->k.type = new_type;
+
+ switch (a->data_type) {
+ case BCH_DATA_free:
+ btree = BTREE_ID_freespace;
+ k->k.p = alloc_freespace_pos(alloc_k.k->p, *a);
+ bch2_key_resize(&k->k, 1);
+ break;
+ case BCH_DATA_need_discard:
+ btree = BTREE_ID_need_discard;
+ k->k.p = alloc_k.k->p;
+ break;
+ default:
+ return 0;
+ }
+
+ old = bch2_bkey_get_iter(trans, &iter, btree,
+ bkey_start_pos(&k->k),
+ BTREE_ITER_INTENT);
+ ret = bkey_err(old);
+ if (ret)
+ return ret;
+
+ if (ca->mi.freespace_initialized &&
+ c->curr_recovery_pass > BCH_RECOVERY_PASS_check_alloc_info &&
+ bch2_trans_inconsistent_on(old.k->type != old_type, trans,
+ "incorrect key when %s %s:%llu:%llu:0 (got %s should be %s)\n"
+ " for %s",
+ set ? "setting" : "clearing",
+ bch2_btree_id_str(btree),
+ iter.pos.inode,
+ iter.pos.offset,
+ 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;
+}
+
+static noinline int bch2_bucket_gen_update(struct btree_trans *trans,
+ struct bpos bucket, u8 gen)
+{
+ struct btree_iter iter;
+ unsigned offset;
+ struct bpos pos = alloc_gens_pos(bucket, &offset);
+ struct bkey_i_bucket_gens *g;
+ struct bkey_s_c k;
+ int ret;
+
+ g = bch2_trans_kmalloc(trans, sizeof(*g));
+ ret = PTR_ERR_OR_ZERO(g);
+ if (ret)
+ return ret;
+
+ k = bch2_bkey_get_iter(trans, &iter, BTREE_ID_bucket_gens, pos,
+ BTREE_ITER_INTENT|
+ BTREE_ITER_WITH_UPDATES);
+ ret = bkey_err(k);
+ if (ret)
+ return ret;
+
+ if (k.k->type != KEY_TYPE_bucket_gens) {
+ bkey_bucket_gens_init(&g->k_i);
+ g->k.p = iter.pos;
+ } else {
+ bkey_reassemble(&g->k_i, k);
+ }
+
+ g->v.gens[offset] = gen;
+
+ ret = bch2_trans_update(trans, &iter, &g->k_i, 0);
+ bch2_trans_iter_exit(trans, &iter);
+ return ret;
+}
+
+int bch2_trigger_alloc(struct btree_trans *trans,
+ enum btree_id btree, unsigned level,
+ struct bkey_s_c old, struct bkey_s new,
+ unsigned flags)
+{
+ struct bch_fs *c = trans->c;
+ int ret = 0;
+
+ if (bch2_trans_inconsistent_on(!bch2_dev_bucket_exists(c, new.k->p), trans,
+ "alloc key for invalid device or bucket"))
+ return -EIO;
+
+ struct bch_dev *ca = bch_dev_bkey_exists(c, new.k->p.inode);
+
+ struct bch_alloc_v4 old_a_convert;
+ const struct bch_alloc_v4 *old_a = bch2_alloc_to_v4(old, &old_a_convert);
+
+ if (flags & BTREE_TRIGGER_TRANSACTIONAL) {
+ struct bch_alloc_v4 *new_a = bkey_s_to_alloc_v4(new).v;
+
+ new_a->data_type = alloc_data_type(*new_a, new_a->data_type);
+
+ if (bch2_bucket_sectors(*new_a) > bch2_bucket_sectors(*old_a)) {
+ 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);
+ SET_BCH_ALLOC_V4_NEED_DISCARD(new_a, true);
+ }
+
+ if (data_type_is_empty(new_a->data_type) &&
+ BCH_ALLOC_V4_NEED_INC_GEN(new_a) &&
+ !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);
+ }
+
+ if (old_a->data_type != new_a->data_type ||
+ (new_a->data_type == BCH_DATA_free &&
+ alloc_freespace_genbits(*old_a) != alloc_freespace_genbits(*new_a))) {
+ ret = bch2_bucket_do_index(trans, old, old_a, false) ?:
+ bch2_bucket_do_index(trans, new.s_c, new_a, true);
+ if (ret)
+ return ret;
+ }
+
+ if (new_a->data_type == BCH_DATA_cached &&
+ !new_a->io_time[READ])
+ new_a->io_time[READ] = max_t(u64, 1, atomic64_read(&c->io_clock[READ].now));
+
+ u64 old_lru = alloc_lru_idx_read(*old_a);
+ u64 new_lru = alloc_lru_idx_read(*new_a);
+ if (old_lru != new_lru) {
+ ret = bch2_lru_change(trans, new.k->p.inode,
+ bucket_to_u64(new.k->p),
+ old_lru, new_lru);
+ if (ret)
+ return ret;
+ }
+
+ new_a->fragmentation_lru = alloc_lru_idx_fragmentation(*new_a,
+ bch_dev_bkey_exists(c, new.k->p.inode));
+ if (old_a->fragmentation_lru != new_a->fragmentation_lru) {
+ ret = bch2_lru_change(trans,
+ BCH_LRU_FRAGMENTATION_START,
+ bucket_to_u64(new.k->p),
+ old_a->fragmentation_lru, new_a->fragmentation_lru);
+ if (ret)
+ return ret;
+ }
+
+ if (old_a->gen != new_a->gen) {
+ ret = bch2_bucket_gen_update(trans, new.k->p, new_a->gen);
+ if (ret)
+ return ret;
+ }
+
+ /*
+ * need to know if we're getting called from the invalidate path or
+ * not:
+ */
+
+ if ((flags & BTREE_TRIGGER_BUCKET_INVALIDATE) &&
+ old_a->cached_sectors) {
+ ret = bch2_update_cached_sectors_list(trans, new.k->p.inode,
+ -((s64) old_a->cached_sectors));
+ if (ret)
+ return ret;
+ }
+ }
+
+ if (!(flags & BTREE_TRIGGER_TRANSACTIONAL) && (flags & BTREE_TRIGGER_INSERT)) {
+ struct bch_alloc_v4 *new_a = bkey_s_to_alloc_v4(new).v;
+ u64 journal_seq = trans->journal_res.seq;
+ u64 bucket_journal_seq = new_a->journal_seq;
+
+ if ((flags & BTREE_TRIGGER_INSERT) &&
+ data_type_is_empty(old_a->data_type) !=
+ data_type_is_empty(new_a->data_type) &&
+ new.k->type == KEY_TYPE_alloc_v4) {
+ struct bch_alloc_v4 *v = bkey_s_to_alloc_v4(new).v;
+
+ /*
+ * If the btree updates referring to a bucket weren't flushed
+ * before the bucket became empty again, then the we don't have
+ * to wait on a journal flush before we can reuse the bucket:
+ */
+ v->journal_seq = bucket_journal_seq =
+ data_type_is_empty(new_a->data_type) &&
+ (journal_seq == v->journal_seq ||
+ bch2_journal_noflush_seq(&c->journal, v->journal_seq))
+ ? 0 : journal_seq;
+ }
+
+ if (!data_type_is_empty(old_a->data_type) &&
+ data_type_is_empty(new_a->data_type) &&
+ bucket_journal_seq) {
+ ret = bch2_set_bucket_needs_journal_commit(&c->buckets_waiting_for_journal,
+ c->journal.flushed_seq_ondisk,
+ new.k->p.inode, new.k->p.offset,
+ bucket_journal_seq);
+ if (ret) {
+ bch2_fs_fatal_error(c,
+ "error setting bucket_needs_journal_commit: %i", ret);
+ return ret;
+ }
+ }
+
+ percpu_down_read(&c->mark_lock);
+ if (new_a->gen != old_a->gen)
+ *bucket_gen(ca, new.k->p.offset) = new_a->gen;
+
+ bch2_dev_usage_update(c, ca, old_a, new_a, journal_seq, false);
+
+ if (new_a->data_type == BCH_DATA_free &&
+ (!new_a->journal_seq || new_a->journal_seq < c->journal.flushed_seq_ondisk))
+ closure_wake_up(&c->freelist_wait);
+
+ if (new_a->data_type == BCH_DATA_need_discard &&
+ (!bucket_journal_seq || bucket_journal_seq < c->journal.flushed_seq_ondisk))
+ bch2_do_discards(c);
+
+ if (old_a->data_type != BCH_DATA_cached &&
+ new_a->data_type == BCH_DATA_cached &&
+ should_invalidate_buckets(ca, bch2_dev_usage_read(ca)))
+ bch2_do_invalidates(c);
+
+ if (new_a->data_type == BCH_DATA_need_gc_gens)
+ bch2_do_gc_gens(c);
+ percpu_up_read(&c->mark_lock);
+ }
+
+ if ((flags & BTREE_TRIGGER_GC) &&
+ (flags & BTREE_TRIGGER_BUCKET_INVALIDATE)) {
+ struct bch_alloc_v4 new_a_convert;
+ const struct bch_alloc_v4 *new_a = bch2_alloc_to_v4(new.s_c, &new_a_convert);
+
+ percpu_down_read(&c->mark_lock);
+ struct bucket *g = gc_bucket(ca, new.k->p.offset);
+
+ bucket_lock(g);
+
+ g->gen_valid = 1;
+ g->gen = new_a->gen;
+ g->data_type = new_a->data_type;
+ g->stripe = new_a->stripe;
+ g->stripe_redundancy = new_a->stripe_redundancy;
+ g->dirty_sectors = new_a->dirty_sectors;
+ g->cached_sectors = new_a->cached_sectors;
+
+ bucket_unlock(g);
+ percpu_up_read(&c->mark_lock);
+ }
+
+ return 0;
+}
+
+/*
+ * This synthesizes deleted extents for holes, similar to BTREE_ITER_SLOTS for
+ * extents style btrees, but works on non-extents btrees:
+ */
+static struct bkey_s_c bch2_get_key_or_hole(struct btree_iter *iter, struct bpos end, struct bkey *hole)
+{
+ struct bkey_s_c k = bch2_btree_iter_peek_slot(iter);
+
+ if (bkey_err(k))
+ return k;
+
+ if (k.k->type) {
+ return k;
+ } else {
+ struct btree_iter iter2;
+ struct bpos next;
+
+ bch2_trans_copy_iter(&iter2, iter);
+
+ struct btree_path *path = btree_iter_path(iter->trans, iter);
+ if (!bpos_eq(path->l[0].b->key.k.p, SPOS_MAX))
+ end = bkey_min(end, bpos_nosnap_successor(path->l[0].b->key.k.p));
+
+ end = bkey_min(end, POS(iter->pos.inode, iter->pos.offset + U32_MAX - 1));
+
+ /*
+ * btree node min/max is a closed interval, upto takes a half
+ * open interval:
+ */
+ k = bch2_btree_iter_peek_upto(&iter2, end);
+ next = iter2.pos;
+ bch2_trans_iter_exit(iter->trans, &iter2);
+
+ BUG_ON(next.offset >= iter->pos.offset + U32_MAX);
+
+ if (bkey_err(k))
+ return k;
+
+ bkey_init(hole);
+ hole->p = iter->pos;
+
+ bch2_key_resize(hole, next.offset - iter->pos.offset);
+ return (struct bkey_s_c) { hole, NULL };
+ }
+}
+
+static bool next_bucket(struct bch_fs *c, struct bpos *bucket)
+{
+ struct bch_dev *ca;
+
+ if (bch2_dev_bucket_exists(c, *bucket))
+ return true;
+
+ if (bch2_dev_exists2(c, bucket->inode)) {
+ ca = bch_dev_bkey_exists(c, bucket->inode);
+
+ if (bucket->offset < ca->mi.first_bucket) {
+ bucket->offset = ca->mi.first_bucket;
+ return true;
+ }
+
+ bucket->inode++;
+ bucket->offset = 0;
+ }
+
+ rcu_read_lock();
+ ca = __bch2_next_dev_idx(c, bucket->inode, NULL);
+ if (ca)
+ *bucket = POS(ca->dev_idx, ca->mi.first_bucket);
+ rcu_read_unlock();
+
+ return ca != NULL;
+}
+
+static struct bkey_s_c bch2_get_key_or_real_bucket_hole(struct btree_iter *iter, struct bkey *hole)
+{
+ struct bch_fs *c = iter->trans->c;
+ struct bkey_s_c k;
+again:
+ k = bch2_get_key_or_hole(iter, POS_MAX, hole);
+ if (bkey_err(k))
+ return k;
+
+ if (!k.k->type) {
+ struct bpos bucket = bkey_start_pos(k.k);
+
+ if (!bch2_dev_bucket_exists(c, bucket)) {
+ if (!next_bucket(c, &bucket))
+ return bkey_s_c_null;
+
+ bch2_btree_iter_set_pos(iter, bucket);
+ goto again;
+ }
+
+ if (!bch2_dev_bucket_exists(c, k.k->p)) {
+ struct bch_dev *ca = bch_dev_bkey_exists(c, bucket.inode);
+
+ bch2_key_resize(hole, ca->mi.nbuckets - bucket.offset);
+ }
+ }
+
+ return k;
+}
+
+static noinline_for_stack
+int bch2_check_alloc_key(struct btree_trans *trans,
+ struct bkey_s_c alloc_k,
+ struct btree_iter *alloc_iter,
+ struct btree_iter *discard_iter,
+ struct btree_iter *freespace_iter,
+ struct btree_iter *bucket_gens_iter)
+{
+ struct bch_fs *c = trans->c;
+ struct bch_dev *ca;
+ struct bch_alloc_v4 a_convert;
+ const struct bch_alloc_v4 *a;
+ unsigned discard_key_type, freespace_key_type;
+ unsigned gens_offset;
+ struct bkey_s_c k;
+ struct printbuf buf = PRINTBUF;
+ int ret;
+
+ if (fsck_err_on(!bch2_dev_bucket_exists(c, alloc_k.k->p), c,
+ alloc_key_to_missing_dev_bucket,
+ "alloc key for invalid device:bucket %llu:%llu",
+ alloc_k.k->p.inode, alloc_k.k->p.offset))
+ 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;
+
+ a = bch2_alloc_to_v4(alloc_k, &a_convert);
+
+ discard_key_type = a->data_type == BCH_DATA_need_discard ? KEY_TYPE_set : 0;
+ bch2_btree_iter_set_pos(discard_iter, alloc_k.k->p);
+ k = bch2_btree_iter_peek_slot(discard_iter);
+ ret = bkey_err(k);
+ if (ret)
+ goto err;
+
+ if (k.k->type != discard_key_type &&
+ (c->opts.reconstruct_alloc ||
+ fsck_err(c, need_discard_key_wrong,
+ "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;
+ }
+
+ freespace_key_type = a->data_type == BCH_DATA_free ? KEY_TYPE_set : 0;
+ bch2_btree_iter_set_pos(freespace_iter, alloc_freespace_pos(alloc_k.k->p, *a));
+ k = bch2_btree_iter_peek_slot(freespace_iter);
+ ret = bkey_err(k);
+ if (ret)
+ goto err;
+
+ if (k.k->type != freespace_key_type &&
+ (c->opts.reconstruct_alloc ||
+ fsck_err(c, freespace_key_wrong,
+ "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;
+ }
+
+ bch2_btree_iter_set_pos(bucket_gens_iter, alloc_gens_pos(alloc_k.k->p, &gens_offset));
+ k = bch2_btree_iter_peek_slot(bucket_gens_iter);
+ ret = bkey_err(k);
+ if (ret)
+ goto err;
+
+ if (a->gen != alloc_gen(k, gens_offset) &&
+ (c->opts.reconstruct_alloc ||
+ fsck_err(c, bucket_gens_key_wrong,
+ "incorrect gen in bucket_gens btree (got %u should be %u)\n"
+ " %s",
+ alloc_gen(k, gens_offset), a->gen,
+ (printbuf_reset(&buf),
+ bch2_bkey_val_to_text(&buf, c, alloc_k), buf.buf)))) {
+ struct bkey_i_bucket_gens *g =
+ bch2_trans_kmalloc(trans, sizeof(*g));
+
+ ret = PTR_ERR_OR_ZERO(g);
+ if (ret)
+ goto err;
+
+ if (k.k->type == KEY_TYPE_bucket_gens) {
+ bkey_reassemble(&g->k_i, k);
+ } else {
+ bkey_bucket_gens_init(&g->k_i);
+ g->k.p = alloc_gens_pos(alloc_k.k->p, &gens_offset);
+ }
+
+ g->v.gens[gens_offset] = a->gen;
+
+ ret = bch2_trans_update(trans, bucket_gens_iter, &g->k_i, 0);
+ if (ret)
+ goto err;
+ }
+err:
+fsck_err:
+ printbuf_exit(&buf);
+ return ret;
+}
+
+static noinline_for_stack
+int bch2_check_alloc_hole_freespace(struct btree_trans *trans,
+ struct bpos start,
+ struct bpos *end,
+ struct btree_iter *freespace_iter)
+{
+ struct bch_fs *c = trans->c;
+ struct bch_dev *ca;
+ struct bkey_s_c k;
+ struct printbuf buf = PRINTBUF;
+ int ret;
+
+ ca = bch_dev_bkey_exists(c, start.inode);
+ if (!ca->mi.freespace_initialized)
+ return 0;
+
+ bch2_btree_iter_set_pos(freespace_iter, start);
+
+ k = bch2_btree_iter_peek_slot(freespace_iter);
+ ret = bkey_err(k);
+ if (ret)
+ goto err;
+
+ *end = bkey_min(k.k->p, *end);
+
+ if (k.k->type != KEY_TYPE_set &&
+ (c->opts.reconstruct_alloc ||
+ fsck_err(c, freespace_hole_missing,
+ "hole in alloc btree missing in freespace btree\n"
+ " device %llu buckets %llu-%llu",
+ freespace_iter->pos.inode,
+ freespace_iter->pos.offset,
+ end->offset))) {
+ 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 = KEY_TYPE_set;
+ update->k.p = freespace_iter->pos;
+ bch2_key_resize(&update->k,
+ min_t(u64, U32_MAX, end->offset -
+ freespace_iter->pos.offset));
+
+ ret = bch2_trans_update(trans, freespace_iter, update, 0);
+ if (ret)
+ goto err;
+ }
+err:
+fsck_err:
+ printbuf_exit(&buf);
+ return ret;
+}
+
+static noinline_for_stack
+int bch2_check_alloc_hole_bucket_gens(struct btree_trans *trans,
+ struct bpos start,
+ struct bpos *end,
+ struct btree_iter *bucket_gens_iter)
+{
+ struct bch_fs *c = trans->c;
+ struct bkey_s_c k;
+ struct printbuf buf = PRINTBUF;
+ unsigned i, gens_offset, gens_end_offset;
+ int ret;
+
+ bch2_btree_iter_set_pos(bucket_gens_iter, alloc_gens_pos(start, &gens_offset));
+
+ k = bch2_btree_iter_peek_slot(bucket_gens_iter);
+ ret = bkey_err(k);
+ if (ret)
+ goto err;
+
+ if (bkey_cmp(alloc_gens_pos(start, &gens_offset),
+ alloc_gens_pos(*end, &gens_end_offset)))
+ gens_end_offset = KEY_TYPE_BUCKET_GENS_NR;
+
+ if (k.k->type == KEY_TYPE_bucket_gens) {
+ struct bkey_i_bucket_gens g;
+ bool need_update = false;
+
+ bkey_reassemble(&g.k_i, k);
+
+ for (i = gens_offset; i < gens_end_offset; i++) {
+ if (fsck_err_on(g.v.gens[i], c,
+ bucket_gens_hole_wrong,
+ "hole in alloc btree at %llu:%llu with nonzero gen in bucket_gens btree (%u)",
+ bucket_gens_pos_to_alloc(k.k->p, i).inode,
+ bucket_gens_pos_to_alloc(k.k->p, i).offset,
+ g.v.gens[i])) {
+ g.v.gens[i] = 0;
+ need_update = true;
+ }
+ }
+
+ if (need_update) {
+ struct bkey_i *u = bch2_trans_kmalloc(trans, sizeof(g));
+
+ ret = PTR_ERR_OR_ZERO(u);
+ if (ret)
+ goto err;
+
+ memcpy(u, &g, sizeof(g));
+
+ ret = bch2_trans_update(trans, bucket_gens_iter, u, 0);
+ if (ret)
+ goto err;
+ }
+ }
+
+ *end = bkey_min(*end, bucket_gens_pos_to_alloc(bpos_nosnap_successor(k.k->p), 0));
+err:
+fsck_err:
+ printbuf_exit(&buf);
+ return ret;
+}
+
+static noinline_for_stack int bch2_check_discard_freespace_key(struct btree_trans *trans,
+ struct btree_iter *iter)
+{
+ struct bch_fs *c = trans->c;
+ struct btree_iter alloc_iter;
+ struct bkey_s_c alloc_k;
+ struct bch_alloc_v4 a_convert;
+ const struct bch_alloc_v4 *a;
+ u64 genbits;
+ struct bpos pos;
+ enum bch_data_type state = iter->btree_id == BTREE_ID_need_discard
+ ? BCH_DATA_need_discard
+ : BCH_DATA_free;
+ struct printbuf buf = PRINTBUF;
+ int ret;
+
+ pos = iter->pos;
+ pos.offset &= ~(~0ULL << 56);
+ genbits = iter->pos.offset & (~0ULL << 56);
+
+ alloc_k = bch2_bkey_get_iter(trans, &alloc_iter, BTREE_ID_alloc, pos, 0);
+ ret = bkey_err(alloc_k);
+ if (ret)
+ return ret;
+
+ if (fsck_err_on(!bch2_dev_bucket_exists(c, pos), c,
+ need_discard_freespace_key_to_invalid_dev_bucket,
+ "entry in %s btree for nonexistant dev:bucket %llu:%llu",
+ bch2_btree_id_str(iter->btree_id), pos.inode, pos.offset))
+ goto delete;
+
+ a = bch2_alloc_to_v4(alloc_k, &a_convert);
+
+ if (fsck_err_on(a->data_type != state ||
+ (state == BCH_DATA_free &&
+ genbits != alloc_freespace_genbits(*a)), c,
+ need_discard_freespace_key_bad,
+ "%s\n incorrectly set at %s:%llu:%llu:0 (free %u, genbits %llu should be %llu)",
+ (bch2_bkey_val_to_text(&buf, c, alloc_k), buf.buf),
+ bch2_btree_id_str(iter->btree_id),
+ iter->pos.inode,
+ iter->pos.offset,
+ a->data_type == state,
+ genbits >> 56, alloc_freespace_genbits(*a) >> 56))
+ goto delete;
+out:
+fsck_err:
+ set_btree_iter_dontneed(&alloc_iter);
+ bch2_trans_iter_exit(trans, &alloc_iter);
+ printbuf_exit(&buf);
+ return ret;
+delete:
+ ret = bch2_btree_delete_extent_at(trans, iter,
+ iter->btree_id == BTREE_ID_freespace ? 1 : 0, 0) ?:
+ bch2_trans_commit(trans, NULL, NULL,
+ BCH_TRANS_COMMIT_no_enospc);
+ goto out;
+}
+
+/*
+ * We've already checked that generation numbers in the bucket_gens btree are
+ * valid for buckets that exist; this just checks for keys for nonexistent
+ * buckets.
+ */
+static noinline_for_stack
+int bch2_check_bucket_gens_key(struct btree_trans *trans,
+ struct btree_iter *iter,
+ struct bkey_s_c k)
+{
+ struct bch_fs *c = trans->c;
+ struct bkey_i_bucket_gens g;
+ struct bch_dev *ca;
+ u64 start = bucket_gens_pos_to_alloc(k.k->p, 0).offset;
+ u64 end = bucket_gens_pos_to_alloc(bpos_nosnap_successor(k.k->p), 0).offset;
+ u64 b;
+ bool need_update = false, dev_exists;
+ struct printbuf buf = PRINTBUF;
+ int ret = 0;
+
+ BUG_ON(k.k->type != KEY_TYPE_bucket_gens);
+ bkey_reassemble(&g.k_i, k);
+
+ /* if no bch_dev, skip out whether we repair or not */
+ dev_exists = bch2_dev_exists2(c, k.k->p.inode);
+ if (!dev_exists) {
+ if (fsck_err_on(!dev_exists, c,
+ bucket_gens_to_invalid_dev,
+ "bucket_gens key for invalid device:\n %s",
+ (bch2_bkey_val_to_text(&buf, c, k), buf.buf))) {
+ ret = bch2_btree_delete_at(trans, iter, 0);
+ }
+ goto out;
+ }
+
+ ca = bch_dev_bkey_exists(c, k.k->p.inode);
+ if (fsck_err_on(end <= ca->mi.first_bucket ||
+ start >= ca->mi.nbuckets, c,
+ bucket_gens_to_invalid_buckets,
+ "bucket_gens key for invalid buckets:\n %s",
+ (bch2_bkey_val_to_text(&buf, c, k), buf.buf))) {
+ ret = bch2_btree_delete_at(trans, iter, 0);
+ goto out;
+ }
+
+ for (b = start; b < ca->mi.first_bucket; b++)
+ if (fsck_err_on(g.v.gens[b & KEY_TYPE_BUCKET_GENS_MASK], c,
+ bucket_gens_nonzero_for_invalid_buckets,
+ "bucket_gens key has nonzero gen for invalid bucket")) {
+ g.v.gens[b & KEY_TYPE_BUCKET_GENS_MASK] = 0;
+ need_update = true;
+ }
+
+ for (b = ca->mi.nbuckets; b < end; b++)
+ if (fsck_err_on(g.v.gens[b & KEY_TYPE_BUCKET_GENS_MASK], c,
+ bucket_gens_nonzero_for_invalid_buckets,
+ "bucket_gens key has nonzero gen for invalid bucket")) {
+ g.v.gens[b & KEY_TYPE_BUCKET_GENS_MASK] = 0;
+ need_update = true;
+ }
+
+ if (need_update) {
+ struct bkey_i *u = bch2_trans_kmalloc(trans, sizeof(g));
+
+ ret = PTR_ERR_OR_ZERO(u);
+ if (ret)
+ goto out;
+
+ memcpy(u, &g, sizeof(g));
+ ret = bch2_trans_update(trans, iter, u, 0);
+ }
+out:
+fsck_err:
+ printbuf_exit(&buf);
+ return ret;
+}
+
+int bch2_check_alloc_info(struct bch_fs *c)
+{
+ struct btree_trans *trans = bch2_trans_get(c);
+ struct btree_iter iter, discard_iter, freespace_iter, bucket_gens_iter;
+ struct bkey hole;
+ struct bkey_s_c k;
+ int ret = 0;
+
+ bch2_trans_iter_init(trans, &iter, BTREE_ID_alloc, POS_MIN,
+ BTREE_ITER_PREFETCH);
+ bch2_trans_iter_init(trans, &discard_iter, BTREE_ID_need_discard, POS_MIN,
+ BTREE_ITER_PREFETCH);
+ bch2_trans_iter_init(trans, &freespace_iter, BTREE_ID_freespace, POS_MIN,
+ BTREE_ITER_PREFETCH);
+ bch2_trans_iter_init(trans, &bucket_gens_iter, BTREE_ID_bucket_gens, POS_MIN,
+ BTREE_ITER_PREFETCH);
+
+ while (1) {
+ struct bpos next;
+
+ bch2_trans_begin(trans);
+
+ k = bch2_get_key_or_real_bucket_hole(&iter, &hole);
+ ret = bkey_err(k);
+ if (ret)
+ goto bkey_err;
+
+ if (!k.k)
+ break;
+
+ if (k.k->type) {
+ next = bpos_nosnap_successor(k.k->p);
+
+ ret = bch2_check_alloc_key(trans,
+ k, &iter,
+ &discard_iter,
+ &freespace_iter,
+ &bucket_gens_iter);
+ if (ret)
+ goto bkey_err;
+ } else {
+ next = k.k->p;
+
+ ret = bch2_check_alloc_hole_freespace(trans,
+ bkey_start_pos(k.k),
+ &next,
+ &freespace_iter) ?:
+ bch2_check_alloc_hole_bucket_gens(trans,
+ bkey_start_pos(k.k),
+ &next,
+ &bucket_gens_iter);
+ if (ret)
+ goto bkey_err;
+ }
+
+ ret = bch2_trans_commit(trans, NULL, NULL,
+ BCH_TRANS_COMMIT_no_enospc);
+ if (ret)
+ goto bkey_err;
+
+ bch2_btree_iter_set_pos(&iter, next);
+bkey_err:
+ if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
+ continue;
+ if (ret)
+ break;
+ }
+ bch2_trans_iter_exit(trans, &bucket_gens_iter);
+ bch2_trans_iter_exit(trans, &freespace_iter);
+ bch2_trans_iter_exit(trans, &discard_iter);
+ bch2_trans_iter_exit(trans, &iter);
+
+ if (ret < 0)
+ goto err;
+
+ ret = for_each_btree_key(trans, iter,
+ BTREE_ID_need_discard, POS_MIN,
+ BTREE_ITER_PREFETCH, k,
+ bch2_check_discard_freespace_key(trans, &iter));
+ if (ret)
+ goto err;
+
+ bch2_trans_iter_init(trans, &iter, BTREE_ID_freespace, POS_MIN,
+ BTREE_ITER_PREFETCH);
+ while (1) {
+ bch2_trans_begin(trans);
+ k = bch2_btree_iter_peek(&iter);
+ if (!k.k)
+ break;
+
+ ret = bkey_err(k) ?:
+ bch2_check_discard_freespace_key(trans, &iter);
+ if (bch2_err_matches(ret, BCH_ERR_transaction_restart)) {
+ ret = 0;
+ continue;
+ }
+ if (ret) {
+ struct printbuf buf = PRINTBUF;
+ bch2_bkey_val_to_text(&buf, c, k);
+
+ bch_err(c, "while checking %s", buf.buf);
+ printbuf_exit(&buf);
+ break;
+ }
+
+ bch2_btree_iter_set_pos(&iter, bpos_nosnap_successor(iter.pos));
+ }
+ bch2_trans_iter_exit(trans, &iter);
+ if (ret)
+ goto err;
+
+ ret = for_each_btree_key_commit(trans, iter,
+ BTREE_ID_bucket_gens, POS_MIN,
+ BTREE_ITER_PREFETCH, k,
+ NULL, NULL, BCH_TRANS_COMMIT_no_enospc,
+ bch2_check_bucket_gens_key(trans, &iter, k));
+err:
+ bch2_trans_put(trans);
+ bch_err_fn(c, ret);
+ return ret;
+}
+
+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_convert;
+ const struct bch_alloc_v4 *a;
+ struct bkey_s_c alloc_k, lru_k;
+ struct printbuf buf = 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;
+
+ a = bch2_alloc_to_v4(alloc_k, &a_convert);
+
+ if (a->data_type != BCH_DATA_cached)
+ return 0;
+
+ if (fsck_err_on(!a->io_time[READ], c,
+ alloc_key_cached_but_read_time_zero,
+ "cached bucket with read_time 0\n"
+ " %s",
+ (printbuf_reset(&buf),
+ bch2_bkey_val_to_text(&buf, c, alloc_k), buf.buf))) {
+ 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] = atomic64_read(&c->io_clock[READ].now);
+ ret = bch2_trans_update(trans, alloc_iter,
+ &a_mut->k_i, BTREE_TRIGGER_NORUN);
+ if (ret)
+ goto err;
+
+ a = &a_mut->v;
+ }
+
+ lru_k = bch2_bkey_get_iter(trans, &lru_iter, BTREE_ID_lru,
+ lru_pos(alloc_k.k->p.inode,
+ bucket_to_u64(alloc_k.k->p),
+ a->io_time[READ]), 0);
+ ret = bkey_err(lru_k);
+ if (ret)
+ return ret;
+
+ if (fsck_err_on(lru_k.k->type != KEY_TYPE_set, c,
+ alloc_key_to_missing_lru_entry,
+ "missing lru entry\n"
+ " %s",
+ (printbuf_reset(&buf),
+ bch2_bkey_val_to_text(&buf, c, alloc_k), buf.buf))) {
+ ret = bch2_lru_set(trans,
+ alloc_k.k->p.inode,
+ bucket_to_u64(alloc_k.k->p),
+ a->io_time[READ]);
+ if (ret)
+ goto err;
+ }
+err:
+fsck_err:
+ bch2_trans_iter_exit(trans, &lru_iter);
+ printbuf_exit(&buf);
+ return ret;
+}
+
+int bch2_check_alloc_to_lru_refs(struct bch_fs *c)
+{
+ int ret = bch2_trans_run(c,
+ for_each_btree_key_commit(trans, iter, BTREE_ID_alloc,
+ POS_MIN, BTREE_ITER_PREFETCH, k,
+ NULL, NULL, BCH_TRANS_COMMIT_no_enospc,
+ bch2_check_alloc_to_lru_ref(trans, &iter)));
+ bch_err_fn(c, ret);
+ return ret;
+}
+
+static int bch2_discard_one_bucket(struct btree_trans *trans,
+ struct btree_iter *need_discard_iter,
+ struct bpos *discard_pos_done,
+ u64 *seen,
+ u64 *open,
+ u64 *need_journal_commit,
+ u64 *discarded)
+{
+ struct bch_fs *c = trans->c;
+ struct bpos pos = need_discard_iter->pos;
+ struct btree_iter iter = { NULL };
+ struct bkey_s_c k;
+ struct bch_dev *ca;
+ struct bkey_i_alloc_v4 *a;
+ struct printbuf buf = PRINTBUF;
+ int ret = 0;
+
+ ca = bch_dev_bkey_exists(c, pos.inode);
+ if (!percpu_ref_tryget(&ca->io_ref)) {
+ bch2_btree_iter_set_pos(need_discard_iter, POS(pos.inode + 1, 0));
+ return 0;
+ }
+
+ if (bch2_bucket_is_open_safe(c, pos.inode, pos.offset)) {
+ (*open)++;
+ goto out;
+ }
+
+ if (bch2_bucket_needs_journal_commit(&c->buckets_waiting_for_journal,
+ c->journal.flushed_seq_ondisk,
+ pos.inode, pos.offset)) {
+ (*need_journal_commit)++;
+ goto out;
+ }
+
+ k = bch2_bkey_get_iter(trans, &iter, BTREE_ID_alloc,
+ need_discard_iter->pos,
+ BTREE_ITER_CACHED);
+ 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;
+ }
+
+ if (a->v.journal_seq > c->journal.flushed_seq_ondisk) {
+ if (c->curr_recovery_pass > BCH_RECOVERY_PASS_check_alloc_info) {
+ bch2_trans_inconsistent(trans,
+ "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;
+ }
+
+ if (a->v.data_type != BCH_DATA_need_discard) {
+ if (c->curr_recovery_pass > BCH_RECOVERY_PASS_check_alloc_info) {
+ bch2_trans_inconsistent(trans,
+ "bucket incorrectly set in need_discard btree\n"
+ "%s",
+ (bch2_bkey_val_to_text(&buf, c, k), buf.buf));
+ ret = -EIO;
+ }
+
+ goto out;
+ }
+
+ if (!bkey_eq(*discard_pos_done, iter.pos) &&
+ 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_pos_done = iter.pos;
+
+ ret = bch2_trans_relock_notrace(trans);
+ if (ret)
+ goto out;
+ }
+
+ SET_BCH_ALLOC_V4_NEED_DISCARD(&a->v, false);
+ a->v.data_type = alloc_data_type(a->v, a->v.data_type);
+write:
+ ret = bch2_trans_update(trans, &iter, &a->k_i, 0) ?:
+ bch2_trans_commit(trans, NULL, NULL,
+ BCH_WATERMARK_btree|
+ BCH_TRANS_COMMIT_no_enospc);
+ if (ret)
+ goto out;
+
+ count_event(c, bucket_discard);
+ (*discarded)++;
+out:
+ (*seen)++;
+ bch2_trans_iter_exit(trans, &iter);
+ percpu_ref_put(&ca->io_ref);
+ 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);
+ u64 seen = 0, open = 0, need_journal_commit = 0, discarded = 0;
+ struct bpos discard_pos_done = POS_MAX;
+ int ret;
+
+ /*
+ * We're doing the commit in bch2_discard_one_bucket instead of using
+ * for_each_btree_key_commit() so that we can increment counters after
+ * successful commit:
+ */
+ ret = bch2_trans_run(c,
+ for_each_btree_key(trans, iter,
+ BTREE_ID_need_discard, POS_MIN, 0, k,
+ bch2_discard_one_bucket(trans, &iter, &discard_pos_done,
+ &seen,
+ &open,
+ &need_journal_commit,
+ &discarded)));
+
+ if (need_journal_commit * 2 > seen)
+ bch2_journal_flush_async(&c->journal, NULL);
+
+ bch2_write_ref_put(c, BCH_WRITE_REF_discard);
+
+ trace_discard_buckets(c, seen, open, need_journal_commit, discarded,
+ bch2_err_str(ret));
+}
+
+void bch2_do_discards(struct bch_fs *c)
+{
+ if (bch2_write_ref_tryget(c, BCH_WRITE_REF_discard) &&
+ !queue_work(c->write_ref_wq, &c->discard_work))
+ bch2_write_ref_put(c, BCH_WRITE_REF_discard);
+}
+
+static int invalidate_one_bucket(struct btree_trans *trans,
+ struct btree_iter *lru_iter,
+ struct bkey_s_c lru_k,
+ s64 *nr_to_invalidate)
+{
+ struct bch_fs *c = trans->c;
+ struct btree_iter alloc_iter = { NULL };
+ struct bkey_i_alloc_v4 *a = NULL;
+ struct printbuf buf = PRINTBUF;
+ struct bpos bucket = u64_to_bucket(lru_k.k->p.offset);
+ unsigned cached_sectors;
+ int ret = 0;
+
+ if (*nr_to_invalidate <= 0)
+ return 1;
+
+ if (!bch2_dev_bucket_exists(c, bucket)) {
+ prt_str(&buf, "lru entry points to invalid bucket");
+ goto err;
+ }
+
+ if (bch2_bucket_is_open_safe(c, bucket.inode, bucket.offset))
+ return 0;
+
+ a = bch2_trans_start_alloc_update(trans, &alloc_iter, bucket);
+ ret = PTR_ERR_OR_ZERO(a);
+ if (ret)
+ goto out;
+
+ /* We expect harmless races here due to the btree write buffer: */
+ if (lru_pos_time(lru_iter->pos) != alloc_lru_idx_read(a->v))
+ goto out;
+
+ BUG_ON(a->v.data_type != BCH_DATA_cached);
+
+ if (!a->v.cached_sectors)
+ bch_err(c, "invalidating empty bucket, confused");
+
+ cached_sectors = a->v.cached_sectors;
+
+ 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) ?:
+ bch2_trans_commit(trans, NULL, NULL,
+ BCH_WATERMARK_btree|
+ BCH_TRANS_COMMIT_no_enospc);
+ if (ret)
+ goto out;
+
+ trace_and_count(c, bucket_invalidate, c, bucket.inode, bucket.offset, cached_sectors);
+ --*nr_to_invalidate;
+out:
+ bch2_trans_iter_exit(trans, &alloc_iter);
+ printbuf_exit(&buf);
+ return ret;
+err:
+ prt_str(&buf, "\n lru key: ");
+ bch2_bkey_val_to_text(&buf, c, lru_k);
+
+ prt_str(&buf, "\n lru entry: ");
+ bch2_lru_pos_to_text(&buf, lru_iter->pos);
+
+ prt_str(&buf, "\n alloc key: ");
+ if (!a)
+ bch2_bpos_to_text(&buf, bucket);
+ else
+ bch2_bkey_val_to_text(&buf, c, bkey_i_to_s_c(&a->k_i));
+
+ bch_err(c, "%s", buf.buf);
+ if (c->curr_recovery_pass > BCH_RECOVERY_PASS_check_lrus) {
+ bch2_inconsistent_error(c);
+ ret = -EINVAL;
+ }
+
+ goto out;
+}
+
+static void bch2_do_invalidates_work(struct work_struct *work)
+{
+ struct bch_fs *c = container_of(work, struct bch_fs, invalidate_work);
+ struct btree_trans *trans = bch2_trans_get(c);
+ int ret = 0;
+
+ ret = bch2_btree_write_buffer_tryflush(trans);
+ if (ret)
+ goto err;
+
+ for_each_member_device(c, ca) {
+ s64 nr_to_invalidate =
+ should_invalidate_buckets(ca, bch2_dev_usage_read(ca));
+
+ ret = for_each_btree_key_upto(trans, iter, BTREE_ID_lru,
+ lru_pos(ca->dev_idx, 0, 0),
+ lru_pos(ca->dev_idx, U64_MAX, LRU_TIME_MAX),
+ BTREE_ITER_INTENT, k,
+ invalidate_one_bucket(trans, &iter, k, &nr_to_invalidate));
+
+ if (ret < 0) {
+ percpu_ref_put(&ca->ref);
+ break;
+ }
+ }
+err:
+ bch2_trans_put(trans);
+ bch2_write_ref_put(c, BCH_WRITE_REF_invalidate);
+}
+
+void bch2_do_invalidates(struct bch_fs *c)
+{
+ if (bch2_write_ref_tryget(c, BCH_WRITE_REF_invalidate) &&
+ !queue_work(c->write_ref_wq, &c->invalidate_work))
+ bch2_write_ref_put(c, BCH_WRITE_REF_invalidate);
+}
+
+int bch2_dev_freespace_init(struct bch_fs *c, struct bch_dev *ca,
+ u64 bucket_start, u64 bucket_end)
+{
+ struct btree_trans *trans = bch2_trans_get(c);
+ struct btree_iter iter;
+ struct bkey_s_c k;
+ struct bkey hole;
+ struct bpos end = POS(ca->dev_idx, bucket_end);
+ struct bch_member *m;
+ unsigned long last_updated = jiffies;
+ int ret;
+
+ BUG_ON(bucket_start > bucket_end);
+ BUG_ON(bucket_end > ca->mi.nbuckets);
+
+ bch2_trans_iter_init(trans, &iter, BTREE_ID_alloc,
+ POS(ca->dev_idx, max_t(u64, ca->mi.first_bucket, bucket_start)),
+ BTREE_ITER_PREFETCH);
+ /*
+ * Scan the alloc btree for every bucket on @ca, and add buckets to the
+ * freespace/need_discard/need_gc_gens btrees as needed:
+ */
+ while (1) {
+ if (last_updated + HZ * 10 < jiffies) {
+ bch_info(ca, "%s: currently at %llu/%llu",
+ __func__, iter.pos.offset, ca->mi.nbuckets);
+ last_updated = jiffies;
+ }
+
+ bch2_trans_begin(trans);
+
+ if (bkey_ge(iter.pos, end)) {
+ ret = 0;
+ break;
+ }
+
+ k = bch2_get_key_or_hole(&iter, end, &hole);
+ ret = bkey_err(k);
+ if (ret)
+ goto bkey_err;
+
+ if (k.k->type) {
+ /*
+ * We process live keys in the alloc btree one at a
+ * time:
+ */
+ struct bch_alloc_v4 a_convert;
+ const struct bch_alloc_v4 *a = bch2_alloc_to_v4(k, &a_convert);
+
+ ret = bch2_bucket_do_index(trans, k, a, true) ?:
+ bch2_trans_commit(trans, NULL, NULL,
+ BCH_TRANS_COMMIT_no_enospc);
+ if (ret)
+ goto bkey_err;
+
+ bch2_btree_iter_advance(&iter);
+ } else {
+ struct bkey_i *freespace;
+
+ freespace = bch2_trans_kmalloc(trans, sizeof(*freespace));
+ ret = PTR_ERR_OR_ZERO(freespace);
+ if (ret)
+ goto bkey_err;
+
+ bkey_init(&freespace->k);
+ freespace->k.type = KEY_TYPE_set;
+ freespace->k.p = k.k->p;
+ freespace->k.size = k.k->size;
+
+ ret = bch2_btree_insert_trans(trans, BTREE_ID_freespace, freespace, 0) ?:
+ bch2_trans_commit(trans, NULL, NULL,
+ BCH_TRANS_COMMIT_no_enospc);
+ if (ret)
+ goto bkey_err;
+
+ bch2_btree_iter_set_pos(&iter, k.k->p);
+ }
+bkey_err:
+ if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
+ continue;
+ if (ret)
+ break;
+ }
+
+ bch2_trans_iter_exit(trans, &iter);
+ bch2_trans_put(trans);
+
+ if (ret < 0) {
+ bch_err_msg(ca, ret, "initializing free space");
+ return ret;
+ }
+
+ mutex_lock(&c->sb_lock);
+ m = bch2_members_v2_get_mut(c->disk_sb.sb, ca->dev_idx);
+ SET_BCH_MEMBER_FREESPACE_INITIALIZED(m, true);
+ mutex_unlock(&c->sb_lock);
+
+ return 0;
+}
+
+int bch2_fs_freespace_init(struct bch_fs *c)
+{
+ 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(c, ca) {
+ if (ca->mi.freespace_initialized)
+ continue;
+
+ if (!doing_init) {
+ bch_info(c, "initializing freespace");
+ doing_init = true;
+ }
+
+ ret = bch2_dev_freespace_init(c, ca, 0, ca->mi.nbuckets);
+ if (ret) {
+ percpu_ref_put(&ca->ref);
+ bch_err_fn(c, ret);
+ 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 0;
+}
+
+/* Bucket IO clocks: */
+
+int bch2_bucket_io_time_reset(struct btree_trans *trans, unsigned dev,
+ size_t bucket_nr, int rw)
+{
+ struct bch_fs *c = trans->c;
+ struct btree_iter iter;
+ struct bkey_i_alloc_v4 *a;
+ u64 now;
+ int ret = 0;
+
+ a = bch2_trans_start_alloc_update(trans, &iter, POS(dev, bucket_nr));
+ ret = PTR_ERR_OR_ZERO(a);
+ if (ret)
+ return ret;
+
+ now = atomic64_read(&c->io_clock[rw].now);
+ if (a->v.io_time[rw] == now)
+ goto out;
+
+ a->v.io_time[rw] = now;
+
+ ret = bch2_trans_update(trans, &iter, &a->k_i, 0) ?:
+ bch2_trans_commit(trans, NULL, NULL, 0);
+out:
+ bch2_trans_iter_exit(trans, &iter);
+ return ret;
+}
+
+/* Startup/shutdown (ro/rw): */
+
+void bch2_recalc_capacity(struct bch_fs *c)
+{
+ u64 capacity = 0, reserved_sectors = 0, gc_reserve;
+ unsigned bucket_size_max = 0;
+ unsigned long ra_pages = 0;
+
+ lockdep_assert_held(&c->state_lock);
+
+ for_each_online_member(c, ca) {
+ 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(c, ca) {
+ u64 dev_reserve = 0;
+
+ /*
+ * 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.
+ */
+
+ dev_reserve += ca->nr_btree_reserve * 2;
+ dev_reserve += ca->mi.nbuckets >> 6; /* copygc reserve */
+
+ dev_reserve += 1; /* btree write point */
+ dev_reserve += 1; /* copygc write point */
+ dev_reserve += 1; /* rebalance write point */
+
+ dev_reserve *= ca->mi.bucket_size;
+
+ capacity += bucket_to_sector(ca, ca->mi.nbuckets -
+ ca->mi.first_bucket);
+
+ reserved_sectors += dev_reserve * 2;
+
+ bucket_size_max = max_t(unsigned, bucket_size_max,
+ ca->mi.bucket_size);
+ }
+
+ 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);
+
+ reserved_sectors = min(reserved_sectors, capacity);
+
+ c->capacity = capacity - reserved_sectors;
+
+ c->bucket_size_max = bucket_size_max;
+
+ /* Wake up case someone was waiting for buckets */
+ closure_wake_up(&c->freelist_wait);
+}
+
+u64 bch2_min_rw_member_capacity(struct bch_fs *c)
+{
+ u64 ret = U64_MAX;
+
+ for_each_rw_member(c, ca)
+ ret = min(ret, ca->mi.nbuckets * ca->mi.bucket_size);
+ return ret;
+}
+
+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 &&
+ ob->dev == ca->dev_idx)
+ 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);
+
+ bch2_open_buckets_stop(c, ca, false);
+
+ /*
+ * 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);
+}
+
+void bch2_fs_allocator_background_init(struct bch_fs *c)
+{
+ spin_lock_init(&c->freelist_lock);
+ INIT_WORK(&c->discard_work, bch2_do_discards_work);
+ INIT_WORK(&c->invalidate_work, bch2_do_invalidates_work);
+}
projects / bcachefs-tools-debian / blobdiff