diff options
Diffstat (limited to 'c_src/libbcachefs/buckets.c')
| -rw-r--r-- | c_src/libbcachefs/buckets.c | 1413 |
1 files changed, 1413 insertions, 0 deletions
diff --git a/c_src/libbcachefs/buckets.c b/c_src/libbcachefs/buckets.c new file mode 100644 index 00000000..67b7e796 --- /dev/null +++ b/c_src/libbcachefs/buckets.c @@ -0,0 +1,1413 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Code for manipulating bucket marks for garbage collection. + * + * Copyright 2014 Datera, Inc. + */ + +#include "bcachefs.h" +#include "alloc_background.h" +#include "backpointers.h" +#include "bset.h" +#include "btree_gc.h" +#include "btree_update.h" +#include "buckets.h" +#include "buckets_waiting_for_journal.h" +#include "ec.h" +#include "error.h" +#include "inode.h" +#include "movinggc.h" +#include "recovery.h" +#include "reflink.h" +#include "replicas.h" +#include "subvolume.h" +#include "trace.h" + +#include <linux/preempt.h> + +static inline void fs_usage_data_type_to_base(struct bch_fs_usage *fs_usage, + enum bch_data_type data_type, + s64 sectors) +{ + switch (data_type) { + case BCH_DATA_btree: + fs_usage->btree += sectors; + break; + case BCH_DATA_user: + case BCH_DATA_parity: + fs_usage->data += sectors; + break; + case BCH_DATA_cached: + fs_usage->cached += sectors; + break; + default: + break; + } +} + +void bch2_fs_usage_initialize(struct bch_fs *c) +{ + percpu_down_write(&c->mark_lock); + struct bch_fs_usage *usage = c->usage_base; + + for (unsigned i = 0; i < ARRAY_SIZE(c->usage); i++) + bch2_fs_usage_acc_to_base(c, i); + + for (unsigned i = 0; i < BCH_REPLICAS_MAX; i++) + usage->reserved += usage->persistent_reserved[i]; + + for (unsigned i = 0; i < c->replicas.nr; i++) { + struct bch_replicas_entry_v1 *e = + cpu_replicas_entry(&c->replicas, i); + + fs_usage_data_type_to_base(usage, e->data_type, usage->replicas[i]); + } + + for_each_member_device(c, ca) { + struct bch_dev_usage dev = bch2_dev_usage_read(ca); + + usage->hidden += (dev.d[BCH_DATA_sb].buckets + + dev.d[BCH_DATA_journal].buckets) * + ca->mi.bucket_size; + } + + percpu_up_write(&c->mark_lock); +} + +static inline struct bch_dev_usage *dev_usage_ptr(struct bch_dev *ca, + unsigned journal_seq, + bool gc) +{ + BUG_ON(!gc && !journal_seq); + + return this_cpu_ptr(gc + ? ca->usage_gc + : ca->usage[journal_seq & JOURNAL_BUF_MASK]); +} + +void bch2_dev_usage_read_fast(struct bch_dev *ca, struct bch_dev_usage *usage) +{ + struct bch_fs *c = ca->fs; + unsigned seq, i, u64s = dev_usage_u64s(); + + do { + seq = read_seqcount_begin(&c->usage_lock); + memcpy(usage, ca->usage_base, u64s * sizeof(u64)); + for (i = 0; i < ARRAY_SIZE(ca->usage); i++) + acc_u64s_percpu((u64 *) usage, (u64 __percpu *) ca->usage[i], u64s); + } while (read_seqcount_retry(&c->usage_lock, seq)); +} + +u64 bch2_fs_usage_read_one(struct bch_fs *c, u64 *v) +{ + ssize_t offset = v - (u64 *) c->usage_base; + unsigned i, seq; + u64 ret; + + BUG_ON(offset < 0 || offset >= fs_usage_u64s(c)); + percpu_rwsem_assert_held(&c->mark_lock); + + do { + seq = read_seqcount_begin(&c->usage_lock); + ret = *v; + + for (i = 0; i < ARRAY_SIZE(c->usage); i++) + ret += percpu_u64_get((u64 __percpu *) c->usage[i] + offset); + } while (read_seqcount_retry(&c->usage_lock, seq)); + + return ret; +} + +struct bch_fs_usage_online *bch2_fs_usage_read(struct bch_fs *c) +{ + struct bch_fs_usage_online *ret; + unsigned nr_replicas = READ_ONCE(c->replicas.nr); + unsigned seq, i; +retry: + ret = kmalloc(__fs_usage_online_u64s(nr_replicas) * sizeof(u64), GFP_KERNEL); + if (unlikely(!ret)) + return NULL; + + percpu_down_read(&c->mark_lock); + + if (nr_replicas != c->replicas.nr) { + nr_replicas = c->replicas.nr; + percpu_up_read(&c->mark_lock); + kfree(ret); + goto retry; + } + + ret->online_reserved = percpu_u64_get(c->online_reserved); + + do { + seq = read_seqcount_begin(&c->usage_lock); + unsafe_memcpy(&ret->u, c->usage_base, + __fs_usage_u64s(nr_replicas) * sizeof(u64), + "embedded variable length struct"); + for (i = 0; i < ARRAY_SIZE(c->usage); i++) + acc_u64s_percpu((u64 *) &ret->u, (u64 __percpu *) c->usage[i], + __fs_usage_u64s(nr_replicas)); + } while (read_seqcount_retry(&c->usage_lock, seq)); + + return ret; +} + +void bch2_fs_usage_acc_to_base(struct bch_fs *c, unsigned idx) +{ + unsigned u64s = fs_usage_u64s(c); + + BUG_ON(idx >= ARRAY_SIZE(c->usage)); + + preempt_disable(); + write_seqcount_begin(&c->usage_lock); + + acc_u64s_percpu((u64 *) c->usage_base, + (u64 __percpu *) c->usage[idx], u64s); + percpu_memset(c->usage[idx], 0, u64s * sizeof(u64)); + + rcu_read_lock(); + for_each_member_device_rcu(c, ca, NULL) { + u64s = dev_usage_u64s(); + + acc_u64s_percpu((u64 *) ca->usage_base, + (u64 __percpu *) ca->usage[idx], u64s); + percpu_memset(ca->usage[idx], 0, u64s * sizeof(u64)); + } + rcu_read_unlock(); + + write_seqcount_end(&c->usage_lock); + preempt_enable(); +} + +void bch2_fs_usage_to_text(struct printbuf *out, + struct bch_fs *c, + struct bch_fs_usage_online *fs_usage) +{ + unsigned i; + + prt_printf(out, "capacity:\t\t\t%llu\n", c->capacity); + + prt_printf(out, "hidden:\t\t\t\t%llu\n", + fs_usage->u.hidden); + prt_printf(out, "data:\t\t\t\t%llu\n", + fs_usage->u.data); + prt_printf(out, "cached:\t\t\t\t%llu\n", + fs_usage->u.cached); + prt_printf(out, "reserved:\t\t\t%llu\n", + fs_usage->u.reserved); + prt_printf(out, "nr_inodes:\t\t\t%llu\n", + fs_usage->u.nr_inodes); + prt_printf(out, "online reserved:\t\t%llu\n", + fs_usage->online_reserved); + + for (i = 0; + i < ARRAY_SIZE(fs_usage->u.persistent_reserved); + i++) { + prt_printf(out, "%u replicas:\n", i + 1); + prt_printf(out, "\treserved:\t\t%llu\n", + fs_usage->u.persistent_reserved[i]); + } + + for (i = 0; i < c->replicas.nr; i++) { + struct bch_replicas_entry_v1 *e = + cpu_replicas_entry(&c->replicas, i); + + prt_printf(out, "\t"); + bch2_replicas_entry_to_text(out, e); + prt_printf(out, ":\t%llu\n", fs_usage->u.replicas[i]); + } +} + +static u64 reserve_factor(u64 r) +{ + return r + (round_up(r, (1 << RESERVE_FACTOR)) >> RESERVE_FACTOR); +} + +u64 bch2_fs_sectors_used(struct bch_fs *c, struct bch_fs_usage_online *fs_usage) +{ + return min(fs_usage->u.hidden + + fs_usage->u.btree + + fs_usage->u.data + + reserve_factor(fs_usage->u.reserved + + fs_usage->online_reserved), + c->capacity); +} + +static struct bch_fs_usage_short +__bch2_fs_usage_read_short(struct bch_fs *c) +{ + struct bch_fs_usage_short ret; + u64 data, reserved; + + ret.capacity = c->capacity - + bch2_fs_usage_read_one(c, &c->usage_base->hidden); + + data = bch2_fs_usage_read_one(c, &c->usage_base->data) + + bch2_fs_usage_read_one(c, &c->usage_base->btree); + reserved = bch2_fs_usage_read_one(c, &c->usage_base->reserved) + + percpu_u64_get(c->online_reserved); + + ret.used = min(ret.capacity, data + reserve_factor(reserved)); + ret.free = ret.capacity - ret.used; + + ret.nr_inodes = bch2_fs_usage_read_one(c, &c->usage_base->nr_inodes); + + return ret; +} + +struct bch_fs_usage_short +bch2_fs_usage_read_short(struct bch_fs *c) +{ + struct bch_fs_usage_short ret; + + percpu_down_read(&c->mark_lock); + ret = __bch2_fs_usage_read_short(c); + percpu_up_read(&c->mark_lock); + + return ret; +} + +void bch2_dev_usage_init(struct bch_dev *ca) +{ + ca->usage_base->d[BCH_DATA_free].buckets = ca->mi.nbuckets - ca->mi.first_bucket; +} + +void bch2_dev_usage_to_text(struct printbuf *out, struct bch_dev_usage *usage) +{ + prt_tab(out); + prt_str(out, "buckets"); + prt_tab_rjust(out); + prt_str(out, "sectors"); + prt_tab_rjust(out); + prt_str(out, "fragmented"); + prt_tab_rjust(out); + prt_newline(out); + + for (unsigned i = 0; i < BCH_DATA_NR; i++) { + prt_str(out, bch2_data_types[i]); + prt_tab(out); + prt_u64(out, usage->d[i].buckets); + prt_tab_rjust(out); + prt_u64(out, usage->d[i].sectors); + prt_tab_rjust(out); + prt_u64(out, usage->d[i].fragmented); + prt_tab_rjust(out); + prt_newline(out); + } +} + +void bch2_dev_usage_update(struct bch_fs *c, struct bch_dev *ca, + const struct bch_alloc_v4 *old, + const struct bch_alloc_v4 *new, + u64 journal_seq, bool gc) +{ + struct bch_fs_usage *fs_usage; + struct bch_dev_usage *u; + + preempt_disable(); + fs_usage = fs_usage_ptr(c, journal_seq, gc); + + if (data_type_is_hidden(old->data_type)) + fs_usage->hidden -= ca->mi.bucket_size; + if (data_type_is_hidden(new->data_type)) + fs_usage->hidden += ca->mi.bucket_size; + + u = dev_usage_ptr(ca, journal_seq, gc); + + u->d[old->data_type].buckets--; + u->d[new->data_type].buckets++; + + u->d[old->data_type].sectors -= bch2_bucket_sectors_dirty(*old); + u->d[new->data_type].sectors += bch2_bucket_sectors_dirty(*new); + + u->d[BCH_DATA_cached].sectors += new->cached_sectors; + u->d[BCH_DATA_cached].sectors -= old->cached_sectors; + + u->d[old->data_type].fragmented -= bch2_bucket_sectors_fragmented(ca, *old); + u->d[new->data_type].fragmented += bch2_bucket_sectors_fragmented(ca, *new); + + preempt_enable(); +} + +static inline struct bch_alloc_v4 bucket_m_to_alloc(struct bucket b) +{ + return (struct bch_alloc_v4) { + .gen = b.gen, + .data_type = b.data_type, + .dirty_sectors = b.dirty_sectors, + .cached_sectors = b.cached_sectors, + .stripe = b.stripe, + }; +} + +void bch2_dev_usage_update_m(struct bch_fs *c, struct bch_dev *ca, + struct bucket *old, struct bucket *new) +{ + struct bch_alloc_v4 old_a = bucket_m_to_alloc(*old); + struct bch_alloc_v4 new_a = bucket_m_to_alloc(*new); + + bch2_dev_usage_update(c, ca, &old_a, &new_a, 0, true); +} + +static inline int __update_replicas(struct bch_fs *c, + struct bch_fs_usage *fs_usage, + struct bch_replicas_entry_v1 *r, + s64 sectors) +{ + int idx = bch2_replicas_entry_idx(c, r); + + if (idx < 0) + return -1; + + fs_usage_data_type_to_base(fs_usage, r->data_type, sectors); + fs_usage->replicas[idx] += sectors; + return 0; +} + +int bch2_update_replicas(struct bch_fs *c, struct bkey_s_c k, + struct bch_replicas_entry_v1 *r, s64 sectors, + unsigned journal_seq, bool gc) +{ + struct bch_fs_usage *fs_usage; + int idx, ret = 0; + struct printbuf buf = PRINTBUF; + + percpu_down_read(&c->mark_lock); + + idx = bch2_replicas_entry_idx(c, r); + if (idx < 0 && + fsck_err(c, ptr_to_missing_replicas_entry, + "no replicas entry\n while marking %s", + (bch2_bkey_val_to_text(&buf, c, k), buf.buf))) { + percpu_up_read(&c->mark_lock); + ret = bch2_mark_replicas(c, r); + percpu_down_read(&c->mark_lock); + + if (ret) + goto err; + idx = bch2_replicas_entry_idx(c, r); + } + if (idx < 0) { + ret = -1; + goto err; + } + + preempt_disable(); + fs_usage = fs_usage_ptr(c, journal_seq, gc); + fs_usage_data_type_to_base(fs_usage, r->data_type, sectors); + fs_usage->replicas[idx] += sectors; + preempt_enable(); +err: +fsck_err: + percpu_up_read(&c->mark_lock); + printbuf_exit(&buf); + return ret; +} + +static inline int update_cached_sectors(struct bch_fs *c, + struct bkey_s_c k, + unsigned dev, s64 sectors, + unsigned journal_seq, bool gc) +{ + struct bch_replicas_padded r; + + bch2_replicas_entry_cached(&r.e, dev); + + return bch2_update_replicas(c, k, &r.e, sectors, journal_seq, gc); +} + +static int __replicas_deltas_realloc(struct btree_trans *trans, unsigned more, + gfp_t gfp) +{ + struct replicas_delta_list *d = trans->fs_usage_deltas; + unsigned new_size = d ? (d->size + more) * 2 : 128; + unsigned alloc_size = sizeof(*d) + new_size; + + WARN_ON_ONCE(alloc_size > REPLICAS_DELTA_LIST_MAX); + + if (!d || d->used + more > d->size) { + d = krealloc(d, alloc_size, gfp|__GFP_ZERO); + + if (unlikely(!d)) { + if (alloc_size > REPLICAS_DELTA_LIST_MAX) + return -ENOMEM; + + d = mempool_alloc(&trans->c->replicas_delta_pool, gfp); + if (!d) + return -ENOMEM; + + memset(d, 0, REPLICAS_DELTA_LIST_MAX); + + if (trans->fs_usage_deltas) + memcpy(d, trans->fs_usage_deltas, + trans->fs_usage_deltas->size + sizeof(*d)); + + new_size = REPLICAS_DELTA_LIST_MAX - sizeof(*d); + kfree(trans->fs_usage_deltas); + } + + d->size = new_size; + trans->fs_usage_deltas = d; + } + + return 0; +} + +int bch2_replicas_deltas_realloc(struct btree_trans *trans, unsigned more) +{ + return allocate_dropping_locks_errcode(trans, + __replicas_deltas_realloc(trans, more, _gfp)); +} + +int bch2_update_replicas_list(struct btree_trans *trans, + struct bch_replicas_entry_v1 *r, + s64 sectors) +{ + struct replicas_delta_list *d; + struct replicas_delta *n; + unsigned b; + int ret; + + if (!sectors) + return 0; + + b = replicas_entry_bytes(r) + 8; + ret = bch2_replicas_deltas_realloc(trans, b); + if (ret) + return ret; + + d = trans->fs_usage_deltas; + n = (void *) d->d + d->used; + n->delta = sectors; + unsafe_memcpy((void *) n + offsetof(struct replicas_delta, r), + r, replicas_entry_bytes(r), + "flexible array member embedded in strcuct with padding"); + bch2_replicas_entry_sort(&n->r); + d->used += b; + return 0; +} + +int bch2_update_cached_sectors_list(struct btree_trans *trans, unsigned dev, s64 sectors) +{ + struct bch_replicas_padded r; + + bch2_replicas_entry_cached(&r.e, dev); + + return bch2_update_replicas_list(trans, &r.e, sectors); +} + +int bch2_mark_metadata_bucket(struct bch_fs *c, struct bch_dev *ca, + size_t b, enum bch_data_type data_type, + unsigned sectors, struct gc_pos pos, + unsigned flags) +{ + struct bucket old, new, *g; + int ret = 0; + + BUG_ON(!(flags & BTREE_TRIGGER_GC)); + BUG_ON(data_type != BCH_DATA_sb && + data_type != BCH_DATA_journal); + + /* + * Backup superblock might be past the end of our normal usable space: + */ + if (b >= ca->mi.nbuckets) + return 0; + + percpu_down_read(&c->mark_lock); + g = gc_bucket(ca, b); + + bucket_lock(g); + old = *g; + + if (bch2_fs_inconsistent_on(g->data_type && + g->data_type != data_type, c, + "different types of data in same bucket: %s, %s", + bch2_data_types[g->data_type], + bch2_data_types[data_type])) { + ret = -EIO; + goto err; + } + + if (bch2_fs_inconsistent_on((u64) g->dirty_sectors + sectors > ca->mi.bucket_size, c, + "bucket %u:%zu gen %u data type %s sector count overflow: %u + %u > bucket size", + ca->dev_idx, b, g->gen, + bch2_data_types[g->data_type ?: data_type], + g->dirty_sectors, sectors)) { + ret = -EIO; + goto err; + } + + g->data_type = data_type; + g->dirty_sectors += sectors; + new = *g; +err: + bucket_unlock(g); + if (!ret) + bch2_dev_usage_update_m(c, ca, &old, &new); + percpu_up_read(&c->mark_lock); + return ret; +} + +int bch2_check_bucket_ref(struct btree_trans *trans, + struct bkey_s_c k, + const struct bch_extent_ptr *ptr, + s64 sectors, enum bch_data_type ptr_data_type, + u8 b_gen, u8 bucket_data_type, + u32 bucket_sectors) +{ + struct bch_fs *c = trans->c; + struct bch_dev *ca = bch_dev_bkey_exists(c, ptr->dev); + size_t bucket_nr = PTR_BUCKET_NR(ca, ptr); + struct printbuf buf = PRINTBUF; + int ret = 0; + + if (bucket_data_type == BCH_DATA_cached) + bucket_data_type = BCH_DATA_user; + + if ((bucket_data_type == BCH_DATA_stripe && ptr_data_type == BCH_DATA_user) || + (bucket_data_type == BCH_DATA_user && ptr_data_type == BCH_DATA_stripe)) + bucket_data_type = ptr_data_type = BCH_DATA_stripe; + + if (gen_after(ptr->gen, b_gen)) { + bch2_fsck_err(c, FSCK_CAN_IGNORE|FSCK_NEED_FSCK, + BCH_FSCK_ERR_ptr_gen_newer_than_bucket_gen, + "bucket %u:%zu gen %u data type %s: ptr gen %u newer than bucket gen\n" + "while marking %s", + ptr->dev, bucket_nr, b_gen, + bch2_data_types[bucket_data_type ?: ptr_data_type], + ptr->gen, + (bch2_bkey_val_to_text(&buf, c, k), buf.buf)); + ret = -EIO; + goto err; + } + + if (gen_cmp(b_gen, ptr->gen) > BUCKET_GC_GEN_MAX) { + bch2_fsck_err(c, FSCK_CAN_IGNORE|FSCK_NEED_FSCK, + BCH_FSCK_ERR_ptr_too_stale, + "bucket %u:%zu gen %u data type %s: ptr gen %u too stale\n" + "while marking %s", + ptr->dev, bucket_nr, b_gen, + bch2_data_types[bucket_data_type ?: ptr_data_type], + ptr->gen, + (printbuf_reset(&buf), + bch2_bkey_val_to_text(&buf, c, k), buf.buf)); + ret = -EIO; + goto err; + } + + if (b_gen != ptr->gen && !ptr->cached) { + bch2_fsck_err(c, FSCK_CAN_IGNORE|FSCK_NEED_FSCK, + BCH_FSCK_ERR_stale_dirty_ptr, + "bucket %u:%zu gen %u (mem gen %u) data type %s: stale dirty ptr (gen %u)\n" + "while marking %s", + ptr->dev, bucket_nr, b_gen, + *bucket_gen(ca, bucket_nr), + bch2_data_types[bucket_data_type ?: ptr_data_type], + ptr->gen, + (printbuf_reset(&buf), + bch2_bkey_val_to_text(&buf, c, k), buf.buf)); + ret = -EIO; + goto err; + } + + if (b_gen != ptr->gen) { + ret = 1; + goto out; + } + + if (!data_type_is_empty(bucket_data_type) && + ptr_data_type && + bucket_data_type != ptr_data_type) { + bch2_fsck_err(c, FSCK_CAN_IGNORE|FSCK_NEED_FSCK, + BCH_FSCK_ERR_ptr_bucket_data_type_mismatch, + "bucket %u:%zu gen %u different types of data in same bucket: %s, %s\n" + "while marking %s", + ptr->dev, bucket_nr, b_gen, + bch2_data_types[bucket_data_type], + bch2_data_types[ptr_data_type], + (printbuf_reset(&buf), + bch2_bkey_val_to_text(&buf, c, k), buf.buf)); + ret = -EIO; + goto err; + } + + if ((u64) bucket_sectors + sectors > U32_MAX) { + bch2_fsck_err(c, FSCK_CAN_IGNORE|FSCK_NEED_FSCK, + BCH_FSCK_ERR_bucket_sector_count_overflow, + "bucket %u:%zu gen %u data type %s sector count overflow: %u + %lli > U32_MAX\n" + "while marking %s", + ptr->dev, bucket_nr, b_gen, + bch2_data_types[bucket_data_type ?: ptr_data_type], + bucket_sectors, sectors, + (printbuf_reset(&buf), + bch2_bkey_val_to_text(&buf, c, k), buf.buf)); + ret = -EIO; + goto err; + } +out: + printbuf_exit(&buf); + return ret; +err: + bch2_dump_trans_updates(trans); + goto out; +} + +void bch2_trans_fs_usage_revert(struct btree_trans *trans, + struct replicas_delta_list *deltas) +{ + struct bch_fs *c = trans->c; + struct bch_fs_usage *dst; + struct replicas_delta *d, *top = (void *) deltas->d + deltas->used; + s64 added = 0; + unsigned i; + + percpu_down_read(&c->mark_lock); + preempt_disable(); + dst = fs_usage_ptr(c, trans->journal_res.seq, false); + + /* revert changes: */ + for (d = deltas->d; d != top; d = replicas_delta_next(d)) { + switch (d->r.data_type) { + case BCH_DATA_btree: + case BCH_DATA_user: + case BCH_DATA_parity: + added += d->delta; + } + BUG_ON(__update_replicas(c, dst, &d->r, -d->delta)); + } + + dst->nr_inodes -= deltas->nr_inodes; + + for (i = 0; i < BCH_REPLICAS_MAX; i++) { + added -= deltas->persistent_reserved[i]; + dst->reserved -= deltas->persistent_reserved[i]; + dst->persistent_reserved[i] -= deltas->persistent_reserved[i]; + } + + if (added > 0) { + trans->disk_res->sectors += added; + this_cpu_add(*c->online_reserved, added); + } + + preempt_enable(); + percpu_up_read(&c->mark_lock); +} + +int bch2_trans_fs_usage_apply(struct btree_trans *trans, + struct replicas_delta_list *deltas) +{ + struct bch_fs *c = trans->c; + static int warned_disk_usage = 0; + bool warn = false; + u64 disk_res_sectors = trans->disk_res ? trans->disk_res->sectors : 0; + struct replicas_delta *d, *d2; + struct replicas_delta *top = (void *) deltas->d + deltas->used; + struct bch_fs_usage *dst; + s64 added = 0, should_not_have_added; + unsigned i; + + percpu_down_read(&c->mark_lock); + preempt_disable(); + dst = fs_usage_ptr(c, trans->journal_res.seq, false); + + for (d = deltas->d; d != top; d = replicas_delta_next(d)) { + switch (d->r.data_type) { + case BCH_DATA_btree: + case BCH_DATA_user: + case BCH_DATA_parity: + added += d->delta; + } + + if (__update_replicas(c, dst, &d->r, d->delta)) + goto need_mark; + } + + dst->nr_inodes += deltas->nr_inodes; + + for (i = 0; i < BCH_REPLICAS_MAX; i++) { + added += deltas->persistent_reserved[i]; + dst->reserved += deltas->persistent_reserved[i]; + dst->persistent_reserved[i] += deltas->persistent_reserved[i]; + } + + /* + * Not allowed to reduce sectors_available except by getting a + * reservation: + */ + should_not_have_added = added - (s64) disk_res_sectors; + if (unlikely(should_not_have_added > 0)) { + u64 old, new, v = atomic64_read(&c->sectors_available); + + do { + old = v; + new = max_t(s64, 0, old - should_not_have_added); + } while ((v = atomic64_cmpxchg(&c->sectors_available, + old, new)) != old); + + added -= should_not_have_added; + warn = true; + } + + if (added > 0) { + trans->disk_res->sectors -= added; + this_cpu_sub(*c->online_reserved, added); + } + + preempt_enable(); + percpu_up_read(&c->mark_lock); + + if (unlikely(warn) && !xchg(&warned_disk_usage, 1)) + bch2_trans_inconsistent(trans, + "disk usage increased %lli more than %llu sectors reserved)", + should_not_have_added, disk_res_sectors); + return 0; +need_mark: + /* revert changes: */ + for (d2 = deltas->d; d2 != d; d2 = replicas_delta_next(d2)) + BUG_ON(__update_replicas(c, dst, &d2->r, -d2->delta)); + + preempt_enable(); + percpu_up_read(&c->mark_lock); + return -1; +} + +/* KEY_TYPE_extent: */ + +static int __mark_pointer(struct btree_trans *trans, + struct bkey_s_c k, + const struct bch_extent_ptr *ptr, + s64 sectors, enum bch_data_type ptr_data_type, + u8 bucket_gen, u8 *bucket_data_type, + u32 *dirty_sectors, u32 *cached_sectors) +{ + u32 *dst_sectors = !ptr->cached + ? dirty_sectors + : cached_sectors; + int ret = bch2_check_bucket_ref(trans, k, ptr, sectors, ptr_data_type, + bucket_gen, *bucket_data_type, *dst_sectors); + + if (ret) + return ret; + + *dst_sectors += sectors; + + if (!*dirty_sectors && !*cached_sectors) + *bucket_data_type = 0; + else if (*bucket_data_type != BCH_DATA_stripe) + *bucket_data_type = ptr_data_type; + + return 0; +} + +static int bch2_trigger_pointer(struct btree_trans *trans, + enum btree_id btree_id, unsigned level, + struct bkey_s_c k, struct extent_ptr_decoded p, + s64 *sectors, + unsigned flags) +{ + bool insert = !(flags & BTREE_TRIGGER_OVERWRITE); + struct bpos bucket; + struct bch_backpointer bp; + + bch2_extent_ptr_to_bp(trans->c, btree_id, level, k, p, &bucket, &bp); + *sectors = insert ? bp.bucket_len : -((s64) bp.bucket_len); + + if (flags & BTREE_TRIGGER_TRANSACTIONAL) { + struct btree_iter iter; + struct bkey_i_alloc_v4 *a = bch2_trans_start_alloc_update(trans, &iter, bucket); + int ret = PTR_ERR_OR_ZERO(a); + if (ret) + return ret; + + ret = __mark_pointer(trans, k, &p.ptr, *sectors, bp.data_type, + a->v.gen, &a->v.data_type, + &a->v.dirty_sectors, &a->v.cached_sectors) ?: + bch2_trans_update(trans, &iter, &a->k_i, 0); + bch2_trans_iter_exit(trans, &iter); + + if (ret) + return ret; + + if (!p.ptr.cached) { + ret = bch2_bucket_backpointer_mod(trans, bucket, bp, k, insert); + if (ret) + return ret; + } + } + + if (flags & BTREE_TRIGGER_GC) { + struct bch_fs *c = trans->c; + struct bch_dev *ca = bch_dev_bkey_exists(c, p.ptr.dev); + enum bch_data_type data_type = bkey_ptr_data_type(btree_id, level, k, p); + + percpu_down_read(&c->mark_lock); + struct bucket *g = PTR_GC_BUCKET(ca, &p.ptr); + bucket_lock(g); + struct bucket old = *g; + + u8 bucket_data_type = g->data_type; + int ret = __mark_pointer(trans, k, &p.ptr, *sectors, + data_type, g->gen, + &bucket_data_type, + &g->dirty_sectors, + &g->cached_sectors); + if (ret) { + bucket_unlock(g); + percpu_up_read(&c->mark_lock); + return ret; + } + + g->data_type = bucket_data_type; + struct bucket new = *g; + bucket_unlock(g); + bch2_dev_usage_update_m(c, ca, &old, &new); + percpu_up_read(&c->mark_lock); + } + + return 0; +} + +static int bch2_trigger_stripe_ptr(struct btree_trans *trans, + struct bkey_s_c k, + struct extent_ptr_decoded p, + enum bch_data_type data_type, + s64 sectors, unsigned flags) +{ + if (flags & BTREE_TRIGGER_TRANSACTIONAL) { + struct btree_iter iter; + struct bkey_i_stripe *s = bch2_bkey_get_mut_typed(trans, &iter, + BTREE_ID_stripes, POS(0, p.ec.idx), + BTREE_ITER_WITH_UPDATES, stripe); + int ret = PTR_ERR_OR_ZERO(s); + if (unlikely(ret)) { + bch2_trans_inconsistent_on(bch2_err_matches(ret, ENOENT), trans, + "pointer to nonexistent stripe %llu", + (u64) p.ec.idx); + goto err; + } + + if (!bch2_ptr_matches_stripe(&s->v, p)) { + bch2_trans_inconsistent(trans, + "stripe pointer doesn't match stripe %llu", + (u64) p.ec.idx); + ret = -EIO; + goto err; + } + + stripe_blockcount_set(&s->v, p.ec.block, + stripe_blockcount_get(&s->v, p.ec.block) + + sectors); + + struct bch_replicas_padded r; + bch2_bkey_to_replicas(&r.e, bkey_i_to_s_c(&s->k_i)); + r.e.data_type = data_type; + ret = bch2_update_replicas_list(trans, &r.e, sectors); +err: + bch2_trans_iter_exit(trans, &iter); + return ret; + } + + if (flags & BTREE_TRIGGER_GC) { + struct bch_fs *c = trans->c; + + BUG_ON(!(flags & BTREE_TRIGGER_GC)); + + struct gc_stripe *m = genradix_ptr_alloc(&c->gc_stripes, p.ec.idx, GFP_KERNEL); + if (!m) { + bch_err(c, "error allocating memory for gc_stripes, idx %llu", + (u64) p.ec.idx); + return -BCH_ERR_ENOMEM_mark_stripe_ptr; + } + + mutex_lock(&c->ec_stripes_heap_lock); + + if (!m || !m->alive) { + mutex_unlock(&c->ec_stripes_heap_lock); + struct printbuf buf = PRINTBUF; + bch2_bkey_val_to_text(&buf, c, k); + bch_err_ratelimited(c, "pointer to nonexistent stripe %llu\n while marking %s", + (u64) p.ec.idx, buf.buf); + printbuf_exit(&buf); + bch2_inconsistent_error(c); + return -EIO; + } + + m->block_sectors[p.ec.block] += sectors; + + struct bch_replicas_padded r = m->r; + mutex_unlock(&c->ec_stripes_heap_lock); + + r.e.data_type = data_type; + bch2_update_replicas(c, k, &r.e, sectors, trans->journal_res.seq, true); + } + + return 0; +} + +static int __trigger_extent(struct btree_trans *trans, + enum btree_id btree_id, unsigned level, + struct bkey_s_c k, unsigned flags) +{ + bool gc = flags & BTREE_TRIGGER_GC; + struct bch_fs *c = trans->c; + struct bkey_ptrs_c ptrs = bch2_bkey_ptrs_c(k); + const union bch_extent_entry *entry; + struct extent_ptr_decoded p; + struct bch_replicas_padded r; + enum bch_data_type data_type = bkey_is_btree_ptr(k.k) + ? BCH_DATA_btree + : BCH_DATA_user; + s64 dirty_sectors = 0; + int ret = 0; + + r.e.data_type = data_type; + r.e.nr_devs = 0; + r.e.nr_required = 1; + + bkey_for_each_ptr_decode(k.k, ptrs, p, entry) { + s64 disk_sectors; + ret = bch2_trigger_pointer(trans, btree_id, level, k, p, &disk_sectors, flags); + if (ret < 0) + return ret; + + bool stale = ret > 0; + + if (p.ptr.cached) { + if (!stale) { + ret = !gc + ? bch2_update_cached_sectors_list(trans, p.ptr.dev, disk_sectors) + : update_cached_sectors(c, k, p.ptr.dev, disk_sectors, 0, true); + bch2_fs_fatal_err_on(ret && gc, c, "%s(): no replicas entry while updating cached sectors", + __func__); + if (ret) + return ret; + } + } else if (!p.has_ec) { + dirty_sectors += disk_sectors; + r.e.devs[r.e.nr_devs++] = p.ptr.dev; + } else { + ret = bch2_trigger_stripe_ptr(trans, k, p, data_type, disk_sectors, flags); + if (ret) + return ret; + + /* + * There may be other dirty pointers in this extent, but + * if so they're not required for mounting if we have an + * erasure coded pointer in this extent: + */ + r.e.nr_required = 0; + } + } + + if (r.e.nr_devs) { + ret = !gc + ? bch2_update_replicas_list(trans, &r.e, dirty_sectors) + : bch2_update_replicas(c, k, &r.e, dirty_sectors, 0, true); + if (unlikely(ret && gc)) { + struct printbuf buf = PRINTBUF; + + bch2_bkey_val_to_text(&buf, c, k); + bch2_fs_fatal_error(c, "%s(): no replicas entry for %s", __func__, buf.buf); + printbuf_exit(&buf); + } + if (ret) + return ret; + } + + return 0; +} + +int bch2_trigger_extent(struct btree_trans *trans, + enum btree_id btree_id, unsigned level, + struct bkey_s_c old, struct bkey_s new, + unsigned flags) +{ + if (flags & BTREE_TRIGGER_TRANSACTIONAL) { + struct bch_fs *c = trans->c; + int mod = (int) bch2_bkey_needs_rebalance(c, new.s_c) - + (int) bch2_bkey_needs_rebalance(c, old); + + if (mod) { + int ret = bch2_btree_bit_mod(trans, BTREE_ID_rebalance_work, new.k->p, mod > 0); + if (ret) + return ret; + } + } + + if (flags & (BTREE_TRIGGER_TRANSACTIONAL|BTREE_TRIGGER_GC)) + return trigger_run_overwrite_then_insert(__trigger_extent, trans, btree_id, level, old, new, flags); + + return 0; +} + +/* KEY_TYPE_reservation */ + +static int __trigger_reservation(struct btree_trans *trans, + enum btree_id btree_id, unsigned level, + struct bkey_s_c k, unsigned flags) +{ + struct bch_fs *c = trans->c; + unsigned replicas = bkey_s_c_to_reservation(k).v->nr_replicas; + s64 sectors = (s64) k.k->size * replicas; + + if (flags & BTREE_TRIGGER_OVERWRITE) + sectors = -sectors; + + if (flags & BTREE_TRIGGER_TRANSACTIONAL) { + int ret = bch2_replicas_deltas_realloc(trans, 0); + if (ret) + return ret; + + struct replicas_delta_list *d = trans->fs_usage_deltas; + replicas = min(replicas, ARRAY_SIZE(d->persistent_reserved)); + + d->persistent_reserved[replicas - 1] += sectors; + } + + if (flags & BTREE_TRIGGER_GC) { + percpu_down_read(&c->mark_lock); + preempt_disable(); + + struct bch_fs_usage *fs_usage = this_cpu_ptr(c->usage_gc); + + replicas = min(replicas, ARRAY_SIZE(fs_usage->persistent_reserved)); + fs_usage->reserved += sectors; + fs_usage->persistent_reserved[replicas - 1] += sectors; + + preempt_enable(); + percpu_up_read(&c->mark_lock); + } + + return 0; +} + +int bch2_trigger_reservation(struct btree_trans *trans, + enum btree_id btree_id, unsigned level, + struct bkey_s_c old, struct bkey_s new, + unsigned flags) +{ + return trigger_run_overwrite_then_insert(__trigger_reservation, trans, btree_id, level, old, new, flags); +} + +/* Mark superblocks: */ + +static int __bch2_trans_mark_metadata_bucket(struct btree_trans *trans, + struct bch_dev *ca, size_t b, + enum bch_data_type type, + unsigned sectors) +{ + struct bch_fs *c = trans->c; + struct btree_iter iter; + struct bkey_i_alloc_v4 *a; + int ret = 0; + + /* + * Backup superblock might be past the end of our normal usable space: + */ + if (b >= ca->mi.nbuckets) + return 0; + + a = bch2_trans_start_alloc_update(trans, &iter, POS(ca->dev_idx, b)); + if (IS_ERR(a)) + return PTR_ERR(a); + + if (a->v.data_type && type && a->v.data_type != type) { + bch2_fsck_err(c, FSCK_CAN_IGNORE|FSCK_NEED_FSCK, + BCH_FSCK_ERR_bucket_metadata_type_mismatch, + "bucket %llu:%llu gen %u different types of data in same bucket: %s, %s\n" + "while marking %s", + iter.pos.inode, iter.pos.offset, a->v.gen, + bch2_data_types[a->v.data_type], + bch2_data_types[type], + bch2_data_types[type]); + ret = -EIO; + goto err; + } + + if (a->v.data_type != type || + a->v.dirty_sectors != sectors) { + a->v.data_type = type; + a->v.dirty_sectors = sectors; + ret = bch2_trans_update(trans, &iter, &a->k_i, 0); + } +err: + bch2_trans_iter_exit(trans, &iter); + return ret; +} + +int bch2_trans_mark_metadata_bucket(struct btree_trans *trans, + struct bch_dev *ca, size_t b, + enum bch_data_type type, + unsigned sectors) +{ + return commit_do(trans, NULL, NULL, 0, + __bch2_trans_mark_metadata_bucket(trans, ca, b, type, sectors)); +} + +static int bch2_trans_mark_metadata_sectors(struct btree_trans *trans, + struct bch_dev *ca, + u64 start, u64 end, + enum bch_data_type type, + u64 *bucket, unsigned *bucket_sectors) +{ + do { + u64 b = sector_to_bucket(ca, start); + unsigned sectors = + min_t(u64, bucket_to_sector(ca, b + 1), end) - start; + + if (b != *bucket && *bucket_sectors) { + int ret = bch2_trans_mark_metadata_bucket(trans, ca, *bucket, + type, *bucket_sectors); + if (ret) + return ret; + + *bucket_sectors = 0; + } + + *bucket = b; + *bucket_sectors += sectors; + start += sectors; + } while (start < end); + + return 0; +} + +static int __bch2_trans_mark_dev_sb(struct btree_trans *trans, + struct bch_dev *ca) +{ + struct bch_sb_layout *layout = &ca->disk_sb.sb->layout; + u64 bucket = 0; + unsigned i, bucket_sectors = 0; + int ret; + + for (i = 0; i < layout->nr_superblocks; i++) { + u64 offset = le64_to_cpu(layout->sb_offset[i]); + + if (offset == BCH_SB_SECTOR) { + ret = bch2_trans_mark_metadata_sectors(trans, ca, + 0, BCH_SB_SECTOR, + BCH_DATA_sb, &bucket, &bucket_sectors); + if (ret) + return ret; + } + + ret = bch2_trans_mark_metadata_sectors(trans, ca, offset, + offset + (1 << layout->sb_max_size_bits), + BCH_DATA_sb, &bucket, &bucket_sectors); + if (ret) + return ret; + } + + if (bucket_sectors) { + ret = bch2_trans_mark_metadata_bucket(trans, ca, + bucket, BCH_DATA_sb, bucket_sectors); + if (ret) + return ret; + } + + for (i = 0; i < ca->journal.nr; i++) { + ret = bch2_trans_mark_metadata_bucket(trans, ca, + ca->journal.buckets[i], + BCH_DATA_journal, ca->mi.bucket_size); + if (ret) + return ret; + } + + return 0; +} + +int bch2_trans_mark_dev_sb(struct bch_fs *c, struct bch_dev *ca) +{ + int ret = bch2_trans_run(c, __bch2_trans_mark_dev_sb(trans, ca)); + + bch_err_fn(c, ret); + return ret; +} + +int bch2_trans_mark_dev_sbs(struct bch_fs *c) +{ + for_each_online_member(c, ca) { + int ret = bch2_trans_mark_dev_sb(c, ca); + if (ret) { + percpu_ref_put(&ca->ref); + return ret; + } + } + + return 0; +} + +/* Disk reservations: */ + +#define SECTORS_CACHE 1024 + +int __bch2_disk_reservation_add(struct bch_fs *c, struct disk_reservation *res, + u64 sectors, int flags) +{ + struct bch_fs_pcpu *pcpu; + u64 old, v, get; + s64 sectors_available; + int ret; + + percpu_down_read(&c->mark_lock); + preempt_disable(); + pcpu = this_cpu_ptr(c->pcpu); + + if (sectors <= pcpu->sectors_available) + goto out; + + v = atomic64_read(&c->sectors_available); + do { + old = v; + get = min((u64) sectors + SECTORS_CACHE, old); + + if (get < sectors) { + preempt_enable(); + goto recalculate; + } + } while ((v = atomic64_cmpxchg(&c->sectors_available, + old, old - get)) != old); + + pcpu->sectors_available += get; + +out: + pcpu->sectors_available -= sectors; + this_cpu_add(*c->online_reserved, sectors); + res->sectors += sectors; + + preempt_enable(); + percpu_up_read(&c->mark_lock); + return 0; + +recalculate: + mutex_lock(&c->sectors_available_lock); + + percpu_u64_set(&c->pcpu->sectors_available, 0); + sectors_available = avail_factor(__bch2_fs_usage_read_short(c).free); + + if (sectors <= sectors_available || + (flags & BCH_DISK_RESERVATION_NOFAIL)) { + atomic64_set(&c->sectors_available, + max_t(s64, 0, sectors_available - sectors)); + this_cpu_add(*c->online_reserved, sectors); + res->sectors += sectors; + ret = 0; + } else { + atomic64_set(&c->sectors_available, sectors_available); + ret = -BCH_ERR_ENOSPC_disk_reservation; + } + + mutex_unlock(&c->sectors_available_lock); + percpu_up_read(&c->mark_lock); + + return ret; +} + +/* Startup/shutdown: */ + +static void bucket_gens_free_rcu(struct rcu_head *rcu) +{ + struct bucket_gens *buckets = + container_of(rcu, struct bucket_gens, rcu); + + kvpfree(buckets, sizeof(*buckets) + buckets->nbuckets); +} + +int bch2_dev_buckets_resize(struct bch_fs *c, struct bch_dev *ca, u64 nbuckets) +{ + struct bucket_gens *bucket_gens = NULL, *old_bucket_gens = NULL; + unsigned long *buckets_nouse = NULL; + bool resize = ca->bucket_gens != NULL; + int ret; + + if (!(bucket_gens = kvpmalloc(sizeof(struct bucket_gens) + nbuckets, + GFP_KERNEL|__GFP_ZERO))) { + ret = -BCH_ERR_ENOMEM_bucket_gens; + goto err; + } + + if ((c->opts.buckets_nouse && + !(buckets_nouse = kvpmalloc(BITS_TO_LONGS(nbuckets) * + sizeof(unsigned long), + GFP_KERNEL|__GFP_ZERO)))) { + ret = -BCH_ERR_ENOMEM_buckets_nouse; + goto err; + } + + bucket_gens->first_bucket = ca->mi.first_bucket; + bucket_gens->nbuckets = nbuckets; + + if (resize) { + down_write(&c->gc_lock); + down_write(&ca->bucket_lock); + percpu_down_write(&c->mark_lock); + } + + old_bucket_gens = rcu_dereference_protected(ca->bucket_gens, 1); + + if (resize) { + size_t n = min(bucket_gens->nbuckets, old_bucket_gens->nbuckets); + + memcpy(bucket_gens->b, + old_bucket_gens->b, + n); + if (buckets_nouse) + memcpy(buckets_nouse, + ca->buckets_nouse, + BITS_TO_LONGS(n) * sizeof(unsigned long)); + } + + rcu_assign_pointer(ca->bucket_gens, bucket_gens); + bucket_gens = old_bucket_gens; + + swap(ca->buckets_nouse, buckets_nouse); + + nbuckets = ca->mi.nbuckets; + + if (resize) { + percpu_up_write(&c->mark_lock); + up_write(&ca->bucket_lock); + up_write(&c->gc_lock); + } + + ret = 0; +err: + kvpfree(buckets_nouse, + BITS_TO_LONGS(nbuckets) * sizeof(unsigned long)); + if (bucket_gens) + call_rcu(&bucket_gens->rcu, bucket_gens_free_rcu); + + return ret; +} + +void bch2_dev_buckets_free(struct bch_dev *ca) +{ + unsigned i; + + kvpfree(ca->buckets_nouse, + BITS_TO_LONGS(ca->mi.nbuckets) * sizeof(unsigned long)); + kvpfree(rcu_dereference_protected(ca->bucket_gens, 1), + sizeof(struct bucket_gens) + ca->mi.nbuckets); + + for (i = 0; i < ARRAY_SIZE(ca->usage); i++) + free_percpu(ca->usage[i]); + kfree(ca->usage_base); +} + +int bch2_dev_buckets_alloc(struct bch_fs *c, struct bch_dev *ca) +{ + unsigned i; + + ca->usage_base = kzalloc(sizeof(struct bch_dev_usage), GFP_KERNEL); + if (!ca->usage_base) + return -BCH_ERR_ENOMEM_usage_init; + + for (i = 0; i < ARRAY_SIZE(ca->usage); i++) { + ca->usage[i] = alloc_percpu(struct bch_dev_usage); + if (!ca->usage[i]) + return -BCH_ERR_ENOMEM_usage_init; + } + + return bch2_dev_buckets_resize(c, ca, ca->mi.nbuckets); +} |