#include "alloc_foreground.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 "ec.h"
#include "error.h"
#include "recovery.h"
+#include "varint.h"
#include <linux/kthread.h>
#include <linux/math64.h>
#include <linux/sort.h>
#include <trace/events/bcachefs.h>
-static const char * const bch2_alloc_field_names[] = {
-#define x(name, bytes) #name,
- BCH_ALLOC_FIELDS()
+const char * const bch2_allocator_states[] = {
+#define x(n) #n,
+ ALLOC_THREAD_STATES()
#undef x
NULL
};
-static void bch2_recalc_oldest_io(struct bch_fs *, struct bch_dev *, int);
-
-/* Ratelimiting/PD controllers */
-
-static void pd_controllers_update(struct work_struct *work)
-{
- struct bch_fs *c = container_of(to_delayed_work(work),
- struct bch_fs,
- pd_controllers_update);
- struct bch_dev *ca;
- unsigned i;
-
- for_each_member_device(ca, c, i) {
- struct bch_dev_usage stats = bch2_dev_usage_read(c, ca);
-
- u64 free = bucket_to_sector(ca,
- __dev_buckets_free(ca, stats)) << 9;
- /*
- * Bytes of internal fragmentation, which can be
- * reclaimed by copy GC
- */
- s64 fragmented = (bucket_to_sector(ca,
- stats.buckets[BCH_DATA_USER] +
- stats.buckets[BCH_DATA_CACHED]) -
- (stats.sectors[BCH_DATA_USER] +
- stats.sectors[BCH_DATA_CACHED])) << 9;
-
- fragmented = max(0LL, fragmented);
-
- bch2_pd_controller_update(&ca->copygc_pd,
- free, fragmented, -1);
- }
-
- schedule_delayed_work(&c->pd_controllers_update,
- c->pd_controllers_update_seconds * HZ);
-}
+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
+};
/* Persistent alloc info: */
-static inline u64 get_alloc_field(const struct bch_alloc *a,
- const void **p, unsigned field)
+static inline u64 alloc_field_v1_get(const struct bch_alloc *a,
+ const void **p, unsigned field)
{
- unsigned bytes = BCH_ALLOC_FIELD_BYTES[field];
+ unsigned bytes = BCH_ALLOC_V1_FIELD_BYTES[field];
u64 v;
if (!(a->fields & (1 << field)))
return v;
}
-static inline void put_alloc_field(struct bkey_i_alloc *a, void **p,
- unsigned field, u64 v)
+static inline void alloc_field_v1_put(struct bkey_i_alloc *a, void **p,
+ unsigned field, u64 v)
{
- unsigned bytes = BCH_ALLOC_FIELD_BYTES[field];
+ unsigned bytes = BCH_ALLOC_V1_FIELD_BYTES[field];
if (!v)
return;
*p += bytes;
}
-struct bkey_alloc_unpacked bch2_alloc_unpack(struct bkey_s_c k)
+static void bch2_alloc_unpack_v1(struct bkey_alloc_unpacked *out,
+ struct bkey_s_c k)
{
- struct bkey_alloc_unpacked ret = { .gen = 0 };
+ const struct bch_alloc *in = bkey_s_c_to_alloc(k).v;
+ const void *d = in->data;
+ unsigned idx = 0;
- if (k.k->type == KEY_TYPE_alloc) {
- const struct bch_alloc *a = bkey_s_c_to_alloc(k).v;
- const void *d = a->data;
- unsigned idx = 0;
+ out->gen = in->gen;
- ret.gen = a->gen;
+#define x(_name, _bits) out->_name = alloc_field_v1_get(in, &d, idx++);
+ BCH_ALLOC_FIELDS_V1()
+#undef x
+}
-#define x(_name, _bits) ret._name = get_alloc_field(a, &d, idx++);
- BCH_ALLOC_FIELDS()
+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 ret;
+ return 0;
}
-void bch2_alloc_pack(struct bkey_i_alloc *dst,
- const struct bkey_alloc_unpacked src)
+static void bch2_alloc_pack_v2(struct bkey_alloc_buf *dst,
+ const struct bkey_alloc_unpacked src)
{
- unsigned idx = 0;
- void *d = dst->v.data;
+ struct bkey_i_alloc_v2 *a = bkey_alloc_v2_init(&dst->k);
+ unsigned nr_fields = 0, last_nonzero_fieldnr = 0;
+ u8 *out = a->v.data;
+ u8 *end = (void *) &dst[1];
+ u8 *last_nonzero_field = out;
unsigned bytes;
- dst->v.fields = 0;
- dst->v.gen = src.gen;
+ a->k.p = POS(src.dev, src.bucket);
+ a->v.gen = src.gen;
+ a->v.oldest_gen = src.oldest_gen;
+ a->v.data_type = src.data_type;
+
+#define x(_name, _bits) \
+ nr_fields++; \
+ \
+ if (src._name) { \
+ out += bch2_varint_encode_fast(out, src._name); \
+ \
+ last_nonzero_field = out; \
+ last_nonzero_fieldnr = nr_fields; \
+ } else { \
+ *out++ = 0; \
+ }
-#define x(_name, _bits) put_alloc_field(dst, &d, idx++, src._name);
- BCH_ALLOC_FIELDS()
+ BCH_ALLOC_FIELDS_V2()
#undef x
+ BUG_ON(out > end);
+
+ out = last_nonzero_field;
+ a->v.nr_fields = last_nonzero_fieldnr;
- bytes = (void *) d - (void *) &dst->v;
- set_bkey_val_bytes(&dst->k, bytes);
- memset_u64s_tail(&dst->v, 0, bytes);
+ bytes = (u8 *) out - (u8 *) &a->v;
+ set_bkey_val_bytes(&a->k, bytes);
+ memset_u64s_tail(&a->v, 0, bytes);
}
-static unsigned bch_alloc_val_u64s(const struct bch_alloc *a)
+struct bkey_alloc_unpacked bch2_alloc_unpack(struct bkey_s_c k)
+{
+ struct bkey_alloc_unpacked ret = {
+ .dev = k.k->p.inode,
+ .bucket = k.k->p.offset,
+ .gen = 0,
+ };
+
+ if (k.k->type == KEY_TYPE_alloc_v2)
+ bch2_alloc_unpack_v2(&ret, k);
+ else if (k.k->type == KEY_TYPE_alloc)
+ bch2_alloc_unpack_v1(&ret, k);
+
+ return ret;
+}
+
+void bch2_alloc_pack(struct bch_fs *c,
+ struct bkey_alloc_buf *dst,
+ const struct bkey_alloc_unpacked src)
+{
+ bch2_alloc_pack_v2(dst, src);
+}
+
+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_FIELD_BYTES); i++)
+ for (i = 0; i < ARRAY_SIZE(BCH_ALLOC_V1_FIELD_BYTES); i++)
if (a->fields & (1 << i))
- bytes += BCH_ALLOC_FIELD_BYTES[i];
+ bytes += BCH_ALLOC_V1_FIELD_BYTES[i];
return DIV_ROUND_UP(bytes, sizeof(u64));
}
-const char *bch2_alloc_invalid(const struct bch_fs *c, struct bkey_s_c k)
+const char *bch2_alloc_v1_invalid(const struct bch_fs *c, struct bkey_s_c k)
{
struct bkey_s_c_alloc a = bkey_s_c_to_alloc(k);
return "invalid device";
/* allow for unknown fields */
- if (bkey_val_u64s(a.k) < bch_alloc_val_u64s(a.v))
+ if (bkey_val_u64s(a.k) < bch_alloc_v1_val_u64s(a.v))
return "incorrect value size";
return NULL;
}
-void bch2_alloc_to_text(struct printbuf *out, struct bch_fs *c,
- struct bkey_s_c k)
+const char *bch2_alloc_v2_invalid(const struct bch_fs *c, struct bkey_s_c k)
{
- struct bkey_s_c_alloc a = bkey_s_c_to_alloc(k);
- const void *d = a.v->data;
- unsigned i;
+ struct bkey_alloc_unpacked u;
+
+ if (k.k->p.inode >= c->sb.nr_devices ||
+ !c->devs[k.k->p.inode])
+ return "invalid device";
- pr_buf(out, "gen %u", a.v->gen);
+ if (bch2_alloc_unpack_v2(&u, k))
+ return "unpack error";
- for (i = 0; i < BCH_ALLOC_FIELD_NR; i++)
- if (a.v->fields & (1 << i))
- pr_buf(out, " %s %llu",
- bch2_alloc_field_names[i],
- get_alloc_field(a.v, &d, i));
+ return NULL;
}
-int bch2_alloc_read(struct bch_fs *c, struct journal_keys *journal_keys)
+void bch2_alloc_to_text(struct printbuf *out, struct bch_fs *c,
+ struct bkey_s_c k)
+{
+ struct bkey_alloc_unpacked u = bch2_alloc_unpack(k);
+
+ pr_buf(out, "gen %u oldest_gen %u data_type %s",
+ u.gen, u.oldest_gen, bch2_data_types[u.data_type]);
+#define x(_name, ...) pr_buf(out, " " #_name " %llu", (u64) u._name);
+ BCH_ALLOC_FIELDS_V2()
+#undef x
+}
+
+static int bch2_alloc_read_fn(struct bch_fs *c, struct bkey_s_c k)
{
- struct btree_trans trans;
- struct btree_and_journal_iter iter;
- struct bkey_s_c k;
struct bch_dev *ca;
- unsigned i;
- int ret = 0;
+ struct bucket *g;
+ struct bkey_alloc_unpacked u;
- bch2_trans_init(&trans, c, 0, 0);
+ if (k.k->type != KEY_TYPE_alloc &&
+ k.k->type != KEY_TYPE_alloc_v2)
+ return 0;
- bch2_btree_and_journal_iter_init(&iter, &trans, journal_keys,
- BTREE_ID_ALLOC, POS_MIN);
+ ca = bch_dev_bkey_exists(c, k.k->p.inode);
+ g = bucket(ca, k.k->p.offset);
+ u = bch2_alloc_unpack(k);
- while ((k = bch2_btree_and_journal_iter_peek(&iter)).k) {
- bch2_mark_key(c, k, 0, 0, NULL, 0,
- BTREE_TRIGGER_ALLOC_READ|
- BTREE_TRIGGER_NOATOMIC);
+ g->_mark.gen = u.gen;
+ g->_mark.data_type = u.data_type;
+ g->_mark.dirty_sectors = u.dirty_sectors;
+ g->_mark.cached_sectors = u.cached_sectors;
+ g->io_time[READ] = u.read_time;
+ g->io_time[WRITE] = u.write_time;
+ g->oldest_gen = u.oldest_gen;
+ g->gen_valid = 1;
- bch2_btree_and_journal_iter_advance(&iter);
- }
+ return 0;
+}
- ret = bch2_trans_exit(&trans) ?: ret;
+int bch2_alloc_read(struct bch_fs *c)
+{
+ int ret;
+
+ down_read(&c->gc_lock);
+ ret = bch2_btree_and_journal_walk(c, BTREE_ID_alloc, bch2_alloc_read_fn);
+ up_read(&c->gc_lock);
if (ret) {
bch_err(c, "error reading alloc info: %i", ret);
return ret;
}
- percpu_down_write(&c->mark_lock);
- bch2_dev_usage_from_buckets(c);
- percpu_up_write(&c->mark_lock);
-
- mutex_lock(&c->bucket_clock[READ].lock);
- for_each_member_device(ca, c, i) {
- down_read(&ca->bucket_lock);
- bch2_recalc_oldest_io(c, ca, READ);
- up_read(&ca->bucket_lock);
- }
- mutex_unlock(&c->bucket_clock[READ].lock);
-
- mutex_lock(&c->bucket_clock[WRITE].lock);
- for_each_member_device(ca, c, i) {
- down_read(&ca->bucket_lock);
- bch2_recalc_oldest_io(c, ca, WRITE);
- up_read(&ca->bucket_lock);
- }
- mutex_unlock(&c->bucket_clock[WRITE].lock);
-
return 0;
}
-enum alloc_write_ret {
- ALLOC_WROTE,
- ALLOC_NOWROTE,
- ALLOC_END,
-};
-
static int bch2_alloc_write_key(struct btree_trans *trans,
struct btree_iter *iter,
unsigned flags)
struct bch_fs *c = trans->c;
struct bkey_s_c k;
struct bch_dev *ca;
- struct bucket_array *ba;
struct bucket *g;
struct bucket_mark m;
struct bkey_alloc_unpacked old_u, new_u;
- __BKEY_PADDED(k, 8) alloc_key; /* hack: */
- struct bkey_i_alloc *a;
+ struct bkey_alloc_buf a;
int ret;
retry:
+ bch2_trans_begin(trans);
+
+ ret = bch2_btree_key_cache_flush(trans,
+ BTREE_ID_alloc, iter->pos);
+ if (ret)
+ goto err;
+
k = bch2_btree_iter_peek_slot(iter);
ret = bkey_err(k);
if (ret)
old_u = bch2_alloc_unpack(k);
- if (iter->pos.inode >= c->sb.nr_devices ||
- !c->devs[iter->pos.inode])
- return ALLOC_END;
-
percpu_down_read(&c->mark_lock);
ca = bch_dev_bkey_exists(c, iter->pos.inode);
- ba = bucket_array(ca);
-
- if (iter->pos.offset >= ba->nbuckets) {
- percpu_up_read(&c->mark_lock);
- return ALLOC_END;
- }
-
- g = &ba->b[iter->pos.offset];
+ g = bucket(ca, iter->pos.offset);
m = READ_ONCE(g->mark);
- new_u = alloc_mem_to_key(g, m);
+ new_u = alloc_mem_to_key(iter, g, m);
percpu_up_read(&c->mark_lock);
if (!bkey_alloc_unpacked_cmp(old_u, new_u))
- return ALLOC_NOWROTE;
-
- a = bkey_alloc_init(&alloc_key.k);
- a->k.p = iter->pos;
- bch2_alloc_pack(a, new_u);
+ return 0;
- bch2_trans_update(trans, iter, &a->k_i,
- BTREE_TRIGGER_NORUN);
- ret = bch2_trans_commit(trans, NULL, NULL,
+ bch2_alloc_pack(c, &a, new_u);
+ ret = bch2_trans_update(trans, iter, &a.k,
+ BTREE_TRIGGER_NORUN) ?:
+ bch2_trans_commit(trans, NULL, NULL,
BTREE_INSERT_NOFAIL|flags);
err:
if (ret == -EINTR)
return ret;
}
-int bch2_alloc_write(struct bch_fs *c, unsigned flags, bool *wrote)
+int bch2_alloc_write(struct bch_fs *c, unsigned flags)
{
struct btree_trans trans;
struct btree_iter *iter;
unsigned i;
int ret = 0;
- BUG_ON(BKEY_ALLOC_VAL_U64s_MAX > 8);
-
- bch2_trans_init(&trans, c, 0, 0);
-
- iter = bch2_trans_get_iter(&trans, BTREE_ID_ALLOC, POS_MIN,
+ bch2_trans_init(&trans, c, BTREE_ITER_MAX, 0);
+ iter = bch2_trans_get_iter(&trans, BTREE_ID_alloc, POS_MIN,
BTREE_ITER_SLOTS|BTREE_ITER_INTENT);
- for_each_rw_member(ca, c, i) {
- unsigned first_bucket;
-
- percpu_down_read(&c->mark_lock);
- first_bucket = bucket_array(ca)->first_bucket;
- percpu_up_read(&c->mark_lock);
+ for_each_member_device(ca, c, i) {
+ bch2_btree_iter_set_pos(iter,
+ POS(ca->dev_idx, ca->mi.first_bucket));
- bch2_btree_iter_set_pos(iter, POS(i, first_bucket));
+ while (iter->pos.offset < ca->mi.nbuckets) {
+ bch2_trans_cond_resched(&trans);
- while (1) {
ret = bch2_alloc_write_key(&trans, iter, flags);
- if (ret < 0 || ret == ALLOC_END)
- break;
- if (ret == ALLOC_WROTE)
- *wrote = true;
- bch2_btree_iter_next_slot(iter);
- }
-
- if (ret < 0) {
- percpu_ref_put(&ca->io_ref);
- break;
+ if (ret) {
+ percpu_ref_put(&ca->ref);
+ goto err;
+ }
+ bch2_btree_iter_advance(iter);
}
}
-
- bch2_trans_exit(&trans);
-
- return ret < 0 ? ret : 0;
-}
-
-int bch2_alloc_replay_key(struct bch_fs *c, struct bkey_i *k)
-{
- struct btree_trans trans;
- struct btree_iter *iter;
- int ret;
-
- bch2_trans_init(&trans, c, 0, 0);
-
- iter = bch2_trans_get_iter(&trans, BTREE_ID_ALLOC, k->k.p,
- BTREE_ITER_SLOTS|BTREE_ITER_INTENT);
-
- ret = bch2_alloc_write_key(&trans, iter,
- BTREE_INSERT_NOFAIL|
- BTREE_INSERT_LAZY_RW|
- BTREE_INSERT_JOURNAL_REPLAY);
+err:
+ bch2_trans_iter_put(&trans, iter);
bch2_trans_exit(&trans);
- return ret < 0 ? ret : 0;
+ return ret;
}
/* Bucket IO clocks: */
-static void bch2_recalc_oldest_io(struct bch_fs *c, struct bch_dev *ca, int rw)
+int bch2_bucket_io_time_reset(struct btree_trans *trans, unsigned dev,
+ size_t bucket_nr, int rw)
{
- struct bucket_clock *clock = &c->bucket_clock[rw];
- struct bucket_array *buckets = bucket_array(ca);
- struct bucket *g;
- u16 max_last_io = 0;
- unsigned i;
-
- lockdep_assert_held(&c->bucket_clock[rw].lock);
-
- /* Recalculate max_last_io for this device: */
- for_each_bucket(g, buckets)
- max_last_io = max(max_last_io, bucket_last_io(c, g, rw));
-
- ca->max_last_bucket_io[rw] = max_last_io;
-
- /* Recalculate global max_last_io: */
- max_last_io = 0;
-
- for_each_member_device(ca, c, i)
- max_last_io = max(max_last_io, ca->max_last_bucket_io[rw]);
-
- clock->max_last_io = max_last_io;
-}
-
-static void bch2_rescale_bucket_io_times(struct bch_fs *c, int rw)
-{
- struct bucket_clock *clock = &c->bucket_clock[rw];
- struct bucket_array *buckets;
- struct bch_dev *ca;
+ struct bch_fs *c = trans->c;
+ struct bch_dev *ca = bch_dev_bkey_exists(c, dev);
+ struct btree_iter *iter;
struct bucket *g;
- unsigned i;
-
- trace_rescale_prios(c);
-
- for_each_member_device(ca, c, i) {
- down_read(&ca->bucket_lock);
- buckets = bucket_array(ca);
-
- for_each_bucket(g, buckets)
- g->io_time[rw] = clock->hand -
- bucket_last_io(c, g, rw) / 2;
-
- bch2_recalc_oldest_io(c, ca, rw);
-
- up_read(&ca->bucket_lock);
- }
-}
-
-static inline u64 bucket_clock_freq(u64 capacity)
-{
- return max(capacity >> 10, 2028ULL);
-}
-
-static void bch2_inc_clock_hand(struct io_timer *timer)
-{
- struct bucket_clock *clock = container_of(timer,
- struct bucket_clock, rescale);
- struct bch_fs *c = container_of(clock,
- struct bch_fs, bucket_clock[clock->rw]);
- struct bch_dev *ca;
- u64 capacity;
- unsigned i;
-
- mutex_lock(&clock->lock);
-
- /* if clock cannot be advanced more, rescale prio */
- if (clock->max_last_io >= U16_MAX - 2)
- bch2_rescale_bucket_io_times(c, clock->rw);
-
- BUG_ON(clock->max_last_io >= U16_MAX - 2);
-
- for_each_member_device(ca, c, i)
- ca->max_last_bucket_io[clock->rw]++;
- clock->max_last_io++;
- clock->hand++;
-
- mutex_unlock(&clock->lock);
+ struct bkey_alloc_buf *a;
+ struct bkey_alloc_unpacked u;
+ u64 *time, now;
+ int ret = 0;
- capacity = READ_ONCE(c->capacity);
+ iter = bch2_trans_get_iter(trans, BTREE_ID_alloc, POS(dev, bucket_nr),
+ BTREE_ITER_CACHED|
+ BTREE_ITER_CACHED_NOFILL|
+ BTREE_ITER_INTENT);
+ ret = bch2_btree_iter_traverse(iter);
+ if (ret)
+ goto out;
- if (!capacity)
- return;
+ a = bch2_trans_kmalloc(trans, sizeof(struct bkey_alloc_buf));
+ ret = PTR_ERR_OR_ZERO(a);
+ if (ret)
+ goto out;
- /*
- * we only increment when 0.1% of the filesystem capacity has been read
- * or written too, this determines if it's time
- *
- * XXX: we shouldn't really be going off of the capacity of devices in
- * RW mode (that will be 0 when we're RO, yet we can still service
- * reads)
- */
- timer->expire += bucket_clock_freq(capacity);
+ percpu_down_read(&c->mark_lock);
+ g = bucket(ca, bucket_nr);
+ u = alloc_mem_to_key(iter, g, READ_ONCE(g->mark));
+ percpu_up_read(&c->mark_lock);
- bch2_io_timer_add(&c->io_clock[clock->rw], timer);
-}
+ time = rw == READ ? &u.read_time : &u.write_time;
+ now = atomic64_read(&c->io_clock[rw].now);
+ if (*time == now)
+ goto out;
-static void bch2_bucket_clock_init(struct bch_fs *c, int rw)
-{
- struct bucket_clock *clock = &c->bucket_clock[rw];
+ *time = now;
- clock->hand = 1;
- clock->rw = rw;
- clock->rescale.fn = bch2_inc_clock_hand;
- clock->rescale.expire = bucket_clock_freq(c->capacity);
- mutex_init(&clock->lock);
+ bch2_alloc_pack(c, a, u);
+ ret = bch2_trans_update(trans, iter, &a->k, 0) ?:
+ bch2_trans_commit(trans, NULL, NULL, 0);
+out:
+ bch2_trans_iter_put(trans, iter);
+ return ret;
}
/* Background allocator thread: */
* commands to the newly free buckets, then puts them on the various freelists.
*/
-#define BUCKET_GC_GEN_MAX 96U
-
-/**
- * wait_buckets_available - wait on reclaimable buckets
- *
- * If there aren't enough available buckets to fill up free_inc, wait until
- * there are.
- */
-static int wait_buckets_available(struct bch_fs *c, struct bch_dev *ca)
-{
- unsigned long gc_count = c->gc_count;
- int ret = 0;
-
- ca->allocator_state = ALLOCATOR_BLOCKED;
- closure_wake_up(&c->freelist_wait);
-
- while (1) {
- set_current_state(TASK_INTERRUPTIBLE);
- if (kthread_should_stop()) {
- ret = 1;
- break;
- }
-
- if (gc_count != c->gc_count)
- ca->inc_gen_really_needs_gc = 0;
-
- if ((ssize_t) (dev_buckets_available(c, ca) -
- ca->inc_gen_really_needs_gc) >=
- (ssize_t) fifo_free(&ca->free_inc))
- break;
-
- up_read(&c->gc_lock);
- schedule();
- try_to_freeze();
- down_read(&c->gc_lock);
- }
-
- __set_current_state(TASK_RUNNING);
- ca->allocator_state = ALLOCATOR_RUNNING;
- closure_wake_up(&c->freelist_wait);
-
- return ret;
-}
-
-static bool bch2_can_invalidate_bucket(struct bch_dev *ca,
- size_t bucket,
- struct bucket_mark mark)
+static bool bch2_can_invalidate_bucket(struct bch_dev *ca, size_t b,
+ struct bucket_mark m)
{
u8 gc_gen;
- if (!is_available_bucket(mark))
+ if (!is_available_bucket(m))
return false;
- if (ca->buckets_nouse &&
- test_bit(bucket, ca->buckets_nouse))
+ if (m.owned_by_allocator)
return false;
- gc_gen = bucket_gc_gen(ca, bucket);
+ if (ca->buckets_nouse &&
+ test_bit(b, ca->buckets_nouse))
+ return false;
- if (gc_gen >= BUCKET_GC_GEN_MAX / 2)
- ca->inc_gen_needs_gc++;
+ gc_gen = bucket_gc_gen(bucket(ca, b));
- if (gc_gen >= BUCKET_GC_GEN_MAX)
- ca->inc_gen_really_needs_gc++;
+ ca->inc_gen_needs_gc += gc_gen >= BUCKET_GC_GEN_MAX / 2;
+ ca->inc_gen_really_needs_gc += gc_gen >= BUCKET_GC_GEN_MAX;
return gc_gen < BUCKET_GC_GEN_MAX;
}
/*
* Determines what order we're going to reuse buckets, smallest bucket_key()
* first.
- *
- *
- * - We take into account the read prio of the bucket, which gives us an
- * indication of how hot the data is -- we scale the prio so that the prio
- * farthest from the clock is worth 1/8th of the closest.
- *
- * - The number of sectors of cached data in the bucket, which gives us an
- * indication of the cost in cache misses this eviction will cause.
- *
- * - If hotness * sectors used compares equal, we pick the bucket with the
- * smallest bucket_gc_gen() - since incrementing the same bucket's generation
- * number repeatedly forces us to run mark and sweep gc to avoid generation
- * number wraparound.
*/
-static unsigned long bucket_sort_key(struct bch_fs *c, struct bch_dev *ca,
- size_t b, struct bucket_mark m)
+static unsigned bucket_sort_key(struct bucket *g, struct bucket_mark m,
+ u64 now, u64 last_seq_ondisk)
{
- unsigned last_io = bucket_last_io(c, bucket(ca, b), READ);
- unsigned max_last_io = ca->max_last_bucket_io[READ];
-
- /*
- * Time since last read, scaled to [0, 8) where larger value indicates
- * more recently read data:
- */
- unsigned long hotness = (max_last_io - last_io) * 7 / max_last_io;
-
- /* How much we want to keep the data in this bucket: */
- unsigned long data_wantness =
- (hotness + 1) * bucket_sectors_used(m);
+ unsigned used = bucket_sectors_used(m);
- unsigned long needs_journal_commit =
- bucket_needs_journal_commit(m, c->journal.last_seq_ondisk);
+ if (used) {
+ /*
+ * Prefer to keep buckets that have been read more recently, and
+ * buckets that have more data in them:
+ */
+ u64 last_read = max_t(s64, 0, now - g->io_time[READ]);
+ u32 last_read_scaled = max_t(u64, U32_MAX, div_u64(last_read, used));
- return (data_wantness << 9) |
- (needs_journal_commit << 8) |
- (bucket_gc_gen(ca, b) / 16);
+ return -last_read_scaled;
+ } else {
+ /*
+ * Prefer to use buckets with smaller gc_gen so that we don't
+ * have to walk the btree and recalculate oldest_gen - but shift
+ * off the low bits so that buckets will still have equal sort
+ * keys when there's only a small difference, so that we can
+ * keep sequential buckets together:
+ */
+ return (bucket_needs_journal_commit(m, last_seq_ondisk) << 4)|
+ (bucket_gc_gen(g) >> 4);
+ }
}
static inline int bucket_alloc_cmp(alloc_heap *h,
{
struct bucket_array *buckets;
struct alloc_heap_entry e = { 0 };
+ u64 now, last_seq_ondisk;
size_t b, i, nr = 0;
- ca->alloc_heap.used = 0;
-
- mutex_lock(&c->bucket_clock[READ].lock);
down_read(&ca->bucket_lock);
buckets = bucket_array(ca);
-
- bch2_recalc_oldest_io(c, ca, READ);
+ ca->alloc_heap.used = 0;
+ now = atomic64_read(&c->io_clock[READ].now);
+ last_seq_ondisk = c->journal.last_seq_ondisk;
/*
* Find buckets with lowest read priority, by building a maxheap sorted
* all buckets have been visited.
*/
for (b = ca->mi.first_bucket; b < ca->mi.nbuckets; b++) {
- struct bucket_mark m = READ_ONCE(buckets->b[b].mark);
- unsigned long key = bucket_sort_key(c, ca, b, m);
+ struct bucket *g = &buckets->b[b];
+ struct bucket_mark m = READ_ONCE(g->mark);
+ unsigned key = bucket_sort_key(g, m, now, last_seq_ondisk);
+
+ cond_resched();
if (!bch2_can_invalidate_bucket(ca, b, m))
continue;
.key = key,
};
}
-
- cond_resched();
}
if (e.nr)
}
up_read(&ca->bucket_lock);
- mutex_unlock(&c->bucket_clock[READ].lock);
}
static void find_reclaimable_buckets_fifo(struct bch_fs *c, struct bch_dev *ca)
size_t i, nr = 0;
ca->inc_gen_needs_gc = 0;
+ ca->inc_gen_really_needs_gc = 0;
switch (ca->mi.replacement) {
- case CACHE_REPLACEMENT_LRU:
+ case BCH_CACHE_REPLACEMENT_lru:
find_reclaimable_buckets_lru(c, ca);
break;
- case CACHE_REPLACEMENT_FIFO:
+ case BCH_CACHE_REPLACEMENT_fifo:
find_reclaimable_buckets_fifo(c, ca);
break;
- case CACHE_REPLACEMENT_RANDOM:
+ case BCH_CACHE_REPLACEMENT_random:
find_reclaimable_buckets_random(c, ca);
break;
}
return nr;
}
-static inline long next_alloc_bucket(struct bch_dev *ca)
-{
- struct alloc_heap_entry e, *top = ca->alloc_heap.data;
-
- while (ca->alloc_heap.used) {
- if (top->nr) {
- size_t b = top->bucket;
-
- top->bucket++;
- top->nr--;
- return b;
- }
-
- heap_pop(&ca->alloc_heap, e, bucket_alloc_cmp, NULL);
- }
-
- return -1;
-}
-
/*
* returns sequence number of most recent journal entry that updated this
* bucket:
}
}
-static int bch2_invalidate_one_bucket2(struct btree_trans *trans,
- struct bch_dev *ca,
- struct btree_iter *iter,
- u64 *journal_seq, unsigned flags)
+static int bucket_invalidate_btree(struct btree_trans *trans,
+ struct bch_dev *ca, u64 b)
{
-#if 0
- __BKEY_PADDED(k, BKEY_ALLOC_VAL_U64s_MAX) alloc_key;
-#else
- /* hack: */
- __BKEY_PADDED(k, 8) alloc_key;
-#endif
struct bch_fs *c = trans->c;
- struct bkey_i_alloc *a;
+ struct bkey_alloc_buf *a;
struct bkey_alloc_unpacked u;
struct bucket *g;
struct bucket_mark m;
- struct bkey_s_c k;
- bool invalidating_cached_data;
- size_t b;
+ struct btree_iter *iter =
+ bch2_trans_get_iter(trans, BTREE_ID_alloc,
+ POS(ca->dev_idx, b),
+ BTREE_ITER_CACHED|
+ BTREE_ITER_CACHED_NOFILL|
+ BTREE_ITER_INTENT);
int ret;
- BUG_ON(!ca->alloc_heap.used ||
- !ca->alloc_heap.data[0].nr);
- b = ca->alloc_heap.data[0].bucket;
-
- /* first, put on free_inc and mark as owned by allocator: */
- percpu_down_read(&c->mark_lock);
- spin_lock(&c->freelist_lock);
-
- verify_not_on_freelist(c, ca, b);
-
- BUG_ON(!fifo_push(&ca->free_inc, b));
-
- bch2_mark_alloc_bucket(c, ca, b, true, gc_pos_alloc(c, NULL), 0);
-
- spin_unlock(&c->freelist_lock);
- percpu_up_read(&c->mark_lock);
-
- BUG_ON(BKEY_ALLOC_VAL_U64s_MAX > 8);
+ a = bch2_trans_kmalloc(trans, sizeof(*a));
+ ret = PTR_ERR_OR_ZERO(a);
+ if (ret)
+ goto err;
- bch2_btree_iter_set_pos(iter, POS(ca->dev_idx, b));
-retry:
- k = bch2_btree_iter_peek_slot(iter);
- ret = bkey_err(k);
+ ret = bch2_btree_iter_traverse(iter);
if (ret)
- return ret;
+ goto err;
- /*
- * The allocator has to start before journal replay is finished - thus,
- * we have to trust the in memory bucket @m, not the version in the
- * btree:
- */
percpu_down_read(&c->mark_lock);
g = bucket(ca, b);
m = READ_ONCE(g->mark);
- u = alloc_mem_to_key(g, m);
+ u = alloc_mem_to_key(iter, g, m);
percpu_up_read(&c->mark_lock);
- invalidating_cached_data = m.cached_sectors != 0;
-
u.gen++;
u.data_type = 0;
u.dirty_sectors = 0;
u.cached_sectors = 0;
- u.read_time = c->bucket_clock[READ].hand;
- u.write_time = c->bucket_clock[WRITE].hand;
+ u.read_time = atomic64_read(&c->io_clock[READ].now);
+ u.write_time = atomic64_read(&c->io_clock[WRITE].now);
+
+ bch2_alloc_pack(c, a, u);
+ ret = bch2_trans_update(trans, iter, &a->k,
+ BTREE_TRIGGER_BUCKET_INVALIDATE);
+err:
+ bch2_trans_iter_put(trans, iter);
+ return ret;
+}
+
+static int bch2_invalidate_one_bucket(struct bch_fs *c, struct bch_dev *ca,
+ u64 *journal_seq, unsigned flags)
+{
+ struct bucket *g;
+ struct bucket_mark m;
+ size_t b;
+ int ret = 0;
+
+ BUG_ON(!ca->alloc_heap.used ||
+ !ca->alloc_heap.data[0].nr);
+ b = ca->alloc_heap.data[0].bucket;
+
+ /* first, put on free_inc and mark as owned by allocator: */
+ percpu_down_read(&c->mark_lock);
+ g = bucket(ca, b);
+ m = READ_ONCE(g->mark);
+
+ BUG_ON(m.dirty_sectors);
+
+ bch2_mark_alloc_bucket(c, ca, b, true);
+
+ spin_lock(&c->freelist_lock);
+ verify_not_on_freelist(c, ca, b);
+ BUG_ON(!fifo_push(&ca->free_inc, b));
+ spin_unlock(&c->freelist_lock);
- a = bkey_alloc_init(&alloc_key.k);
- a->k.p = iter->pos;
- bch2_alloc_pack(a, u);
+ /*
+ * If we're not invalidating cached data, we only increment the bucket
+ * gen in memory here, the incremented gen will be updated in the btree
+ * by bch2_trans_mark_pointer():
+ */
+ if (!m.cached_sectors &&
+ !bucket_needs_journal_commit(m, c->journal.last_seq_ondisk)) {
+ BUG_ON(m.data_type);
+ bucket_cmpxchg(g, m, m.gen++);
+ percpu_up_read(&c->mark_lock);
+ goto out;
+ }
- bch2_trans_update(trans, iter, &a->k_i,
- BTREE_TRIGGER_BUCKET_INVALIDATE);
+ percpu_up_read(&c->mark_lock);
/*
- * XXX:
- * when using deferred btree updates, we have journal reclaim doing
- * btree updates and thus requiring the allocator to make forward
- * progress, and here the allocator is requiring space in the journal -
- * so we need a journal pre-reservation:
+ * If the read-only path is trying to shut down, we can't be generating
+ * new btree updates:
*/
- ret = bch2_trans_commit(trans, NULL,
- invalidating_cached_data ? journal_seq : NULL,
- BTREE_INSERT_NOUNLOCK|
- BTREE_INSERT_NOCHECK_RW|
- BTREE_INSERT_NOFAIL|
- BTREE_INSERT_USE_RESERVE|
- BTREE_INSERT_USE_ALLOC_RESERVE|
- flags);
- if (ret == -EINTR)
- goto retry;
+ if (test_bit(BCH_FS_ALLOCATOR_STOPPING, &c->flags)) {
+ ret = 1;
+ goto out;
+ }
+ ret = bch2_trans_do(c, NULL, journal_seq,
+ BTREE_INSERT_NOCHECK_RW|
+ BTREE_INSERT_NOFAIL|
+ BTREE_INSERT_JOURNAL_RESERVED|
+ flags,
+ bucket_invalidate_btree(&trans, ca, b));
+out:
if (!ret) {
/* remove from alloc_heap: */
struct alloc_heap_entry e, *top = ca->alloc_heap.data;
percpu_down_read(&c->mark_lock);
spin_lock(&c->freelist_lock);
- bch2_mark_alloc_bucket(c, ca, b, false,
- gc_pos_alloc(c, NULL), 0);
+ bch2_mark_alloc_bucket(c, ca, b, false);
BUG_ON(!fifo_pop_back(&ca->free_inc, b2));
BUG_ON(b != b2);
percpu_up_read(&c->mark_lock);
}
- return ret;
-}
-
-static bool bch2_invalidate_one_bucket(struct bch_fs *c, struct bch_dev *ca,
- size_t bucket, u64 *flush_seq)
-{
- struct bucket_mark m;
-
- percpu_down_read(&c->mark_lock);
- spin_lock(&c->freelist_lock);
-
- bch2_invalidate_bucket(c, ca, bucket, &m);
-
- verify_not_on_freelist(c, ca, bucket);
- BUG_ON(!fifo_push(&ca->free_inc, bucket));
-
- spin_unlock(&c->freelist_lock);
-
- bucket_io_clock_reset(c, ca, bucket, READ);
- bucket_io_clock_reset(c, ca, bucket, WRITE);
-
- percpu_up_read(&c->mark_lock);
-
- *flush_seq = max(*flush_seq, bucket_journal_seq(c, m));
-
- return m.cached_sectors != 0;
+ return ret < 0 ? ret : 0;
}
/*
*/
static int bch2_invalidate_buckets(struct bch_fs *c, struct bch_dev *ca)
{
- struct btree_trans trans;
- struct btree_iter *iter;
u64 journal_seq = 0;
int ret = 0;
- bch2_trans_init(&trans, c, 0, 0);
-
- iter = bch2_trans_get_iter(&trans, BTREE_ID_ALLOC,
- POS(ca->dev_idx, 0),
- BTREE_ITER_SLOTS|BTREE_ITER_INTENT);
-
/* Only use nowait if we've already invalidated at least one bucket: */
while (!ret &&
!fifo_full(&ca->free_inc) &&
- ca->alloc_heap.used)
- ret = bch2_invalidate_one_bucket2(&trans, ca, iter, &journal_seq,
- BTREE_INSERT_GC_LOCK_HELD|
+ ca->alloc_heap.used) {
+ if (kthread_should_stop()) {
+ ret = 1;
+ break;
+ }
+
+ ret = bch2_invalidate_one_bucket(c, ca, &journal_seq,
(!fifo_empty(&ca->free_inc)
? BTREE_INSERT_NOWAIT : 0));
-
- bch2_trans_exit(&trans);
+ /*
+ * We only want to batch up invalidates when they're going to
+ * require flushing the journal:
+ */
+ if (!journal_seq)
+ break;
+ }
/* If we used NOWAIT, don't return the error: */
if (!fifo_empty(&ca->free_inc))
return 0;
}
-static int push_invalidated_bucket(struct bch_fs *c, struct bch_dev *ca, size_t bucket)
+static void alloc_thread_set_state(struct bch_dev *ca, unsigned new_state)
+{
+ if (ca->allocator_state != new_state) {
+ ca->allocator_state = new_state;
+ closure_wake_up(&ca->fs->freelist_wait);
+ }
+}
+
+static int push_invalidated_bucket(struct bch_fs *c, struct bch_dev *ca, u64 b)
{
unsigned i;
int ret = 0;
- while (1) {
- set_current_state(TASK_INTERRUPTIBLE);
-
- spin_lock(&c->freelist_lock);
- for (i = 0; i < RESERVE_NR; i++)
- if (fifo_push(&ca->free[i], bucket)) {
- fifo_pop(&ca->free_inc, bucket);
-
- closure_wake_up(&c->freelist_wait);
- ca->allocator_state = ALLOCATOR_RUNNING;
-
- spin_unlock(&c->freelist_lock);
- goto out;
- }
-
- if (ca->allocator_state != ALLOCATOR_BLOCKED_FULL) {
- ca->allocator_state = ALLOCATOR_BLOCKED_FULL;
- closure_wake_up(&c->freelist_wait);
- }
-
- spin_unlock(&c->freelist_lock);
+ spin_lock(&c->freelist_lock);
+ for (i = 0; i < RESERVE_NR; i++) {
+ /*
+ * Don't strand buckets on the copygc freelist until
+ * after recovery is finished:
+ */
+ if (i == RESERVE_MOVINGGC &&
+ !test_bit(BCH_FS_STARTED, &c->flags))
+ continue;
- if ((current->flags & PF_KTHREAD) &&
- kthread_should_stop()) {
+ if (fifo_push(&ca->free[i], b)) {
+ fifo_pop(&ca->free_inc, b);
ret = 1;
break;
}
-
- schedule();
- try_to_freeze();
}
-out:
- __set_current_state(TASK_RUNNING);
+ spin_unlock(&c->freelist_lock);
+
+ ca->allocator_state = ret
+ ? ALLOCATOR_running
+ : ALLOCATOR_blocked_full;
+ closure_wake_up(&c->freelist_wait);
return ret;
}
-/*
- * Pulls buckets off free_inc, discards them (if enabled), then adds them to
- * freelists, waiting until there's room if necessary:
- */
-static int discard_invalidated_buckets(struct bch_fs *c, struct bch_dev *ca)
+static void discard_one_bucket(struct bch_fs *c, struct bch_dev *ca, u64 b)
{
- while (!fifo_empty(&ca->free_inc)) {
- size_t bucket = fifo_peek(&ca->free_inc);
+ if (ca->mi.discard &&
+ blk_queue_discard(bdev_get_queue(ca->disk_sb.bdev)))
+ blkdev_issue_discard(ca->disk_sb.bdev, bucket_to_sector(ca, b),
+ ca->mi.bucket_size, GFP_NOFS, 0);
+}
- if (ca->mi.discard &&
- blk_queue_discard(bdev_get_queue(ca->disk_sb.bdev)))
- blkdev_issue_discard(ca->disk_sb.bdev,
- bucket_to_sector(ca, bucket),
- ca->mi.bucket_size, GFP_NOIO, 0);
+static bool allocator_thread_running(struct bch_dev *ca)
+{
+ unsigned state = ca->mi.state == BCH_MEMBER_STATE_rw &&
+ test_bit(BCH_FS_ALLOCATOR_RUNNING, &ca->fs->flags)
+ ? ALLOCATOR_running
+ : ALLOCATOR_stopped;
+ alloc_thread_set_state(ca, state);
+ return state == ALLOCATOR_running;
+}
- if (push_invalidated_bucket(c, ca, bucket))
- return 1;
- }
+static int buckets_available(struct bch_dev *ca, unsigned long gc_count)
+{
+ s64 available = dev_buckets_reclaimable(ca) -
+ (gc_count == ca->fs->gc_count ? ca->inc_gen_really_needs_gc : 0);
+ bool ret = available > 0;
- return 0;
+ alloc_thread_set_state(ca, ret
+ ? ALLOCATOR_running
+ : ALLOCATOR_blocked);
+ return ret;
}
/**
{
struct bch_dev *ca = arg;
struct bch_fs *c = ca->fs;
+ unsigned long gc_count = c->gc_count;
size_t nr;
int ret;
set_freezable();
- ca->allocator_state = ALLOCATOR_RUNNING;
while (1) {
- cond_resched();
-
- pr_debug("discarding %zu invalidated buckets",
- fifo_used(&ca->free_inc));
-
- ret = discard_invalidated_buckets(c, ca);
+ ret = kthread_wait_freezable(allocator_thread_running(ca));
if (ret)
goto stop;
- down_read(&c->gc_lock);
-
- ret = bch2_invalidate_buckets(c, ca);
- if (ret) {
- up_read(&c->gc_lock);
- goto stop;
- }
-
- if (!fifo_empty(&ca->free_inc)) {
- up_read(&c->gc_lock);
- continue;
- }
-
- pr_debug("free_inc now empty");
-
- do {
- /*
- * Find some buckets that we can invalidate, either
- * they're completely unused, or only contain clean data
- * that's been written back to the backing device or
- * another cache tier
- */
+ while (!ca->alloc_heap.used) {
+ cond_resched();
- pr_debug("scanning for reclaimable buckets");
+ ret = kthread_wait_freezable(buckets_available(ca, gc_count));
+ if (ret)
+ goto stop;
+ gc_count = c->gc_count;
nr = find_reclaimable_buckets(c, ca);
- pr_debug("found %zu buckets", nr);
-
- trace_alloc_batch(ca, nr, ca->alloc_heap.size);
+ trace_alloc_scan(ca, nr, ca->inc_gen_needs_gc,
+ ca->inc_gen_really_needs_gc);
if ((ca->inc_gen_needs_gc >= ALLOC_SCAN_BATCH(ca) ||
ca->inc_gen_really_needs_gc) &&
atomic_inc(&c->kick_gc);
wake_up_process(c->gc_thread);
}
+ }
- /*
- * If we found any buckets, we have to invalidate them
- * before we scan for more - but if we didn't find very
- * many we may want to wait on more buckets being
- * available so we don't spin:
- */
- if (!nr ||
- (nr < ALLOC_SCAN_BATCH(ca) &&
- !fifo_empty(&ca->free[RESERVE_NONE]))) {
- ret = wait_buckets_available(c, ca);
- if (ret) {
- up_read(&c->gc_lock);
- goto stop;
- }
- }
- } while (!nr);
+ ret = bch2_invalidate_buckets(c, ca);
+ if (ret)
+ goto stop;
- up_read(&c->gc_lock);
+ while (!fifo_empty(&ca->free_inc)) {
+ u64 b = fifo_peek(&ca->free_inc);
- pr_debug("%zu buckets to invalidate", nr);
+ discard_one_bucket(c, ca, b);
- /*
- * alloc_heap is now full of newly-invalidated buckets: next,
- * write out the new bucket gens:
- */
+ ret = kthread_wait_freezable(push_invalidated_bucket(c, ca, b));
+ if (ret)
+ goto stop;
+ }
}
-
stop:
- pr_debug("alloc thread stopping (ret %i)", ret);
- ca->allocator_state = ALLOCATOR_STOPPED;
- closure_wake_up(&c->freelist_wait);
+ alloc_thread_set_state(ca, ALLOCATOR_stopped);
return 0;
}
dev_reserve *= ca->mi.bucket_size;
- ca->copygc_threshold = dev_reserve;
-
capacity += bucket_to_sector(ca, ca->mi.nbuckets -
ca->mi.first_bucket);
c->bucket_size_max = bucket_size_max;
- if (c->capacity) {
- bch2_io_timer_add(&c->io_clock[READ],
- &c->bucket_clock[READ].rescale);
- bch2_io_timer_add(&c->io_clock[WRITE],
- &c->bucket_clock[WRITE].rescale);
- } else {
- bch2_io_timer_del(&c->io_clock[READ],
- &c->bucket_clock[READ].rescale);
- bch2_io_timer_del(&c->io_clock[WRITE],
- &c->bucket_clock[WRITE].rescale);
- }
-
/* Wake up case someone was waiting for buckets */
closure_wake_up(&c->freelist_wait);
}
for (i = 0; i < ARRAY_SIZE(c->write_points); i++)
bch2_writepoint_stop(c, ca, &c->write_points[i]);
- bch2_writepoint_stop(c, ca, &ca->copygc_write_point);
+ bch2_writepoint_stop(c, ca, &c->copygc_write_point);
bch2_writepoint_stop(c, ca, &c->rebalance_write_point);
bch2_writepoint_stop(c, ca, &c->btree_write_point);
{
if (ca->alloc_thread)
closure_wait_event(&c->freelist_wait,
- ca->allocator_state != ALLOCATOR_RUNNING);
+ ca->allocator_state != ALLOCATOR_running);
}
/* stop allocator thread: */
return 0;
p = kthread_create(bch2_allocator_thread, ca,
- "bch_alloc[%s]", ca->name);
- if (IS_ERR(p))
+ "bch-alloc/%s", ca->name);
+ if (IS_ERR(p)) {
+ bch_err(ca->fs, "error creating allocator thread: %li",
+ PTR_ERR(p));
return PTR_ERR(p);
+ }
get_task_struct(p);
rcu_assign_pointer(ca->alloc_thread, p);
return 0;
}
-static bool flush_held_btree_writes(struct bch_fs *c)
-{
- struct bucket_table *tbl;
- struct rhash_head *pos;
- struct btree *b;
- bool nodes_unwritten;
- size_t i;
-again:
- cond_resched();
- nodes_unwritten = false;
-
- if (bch2_journal_error(&c->journal))
- return true;
-
- rcu_read_lock();
- for_each_cached_btree(b, c, tbl, i, pos)
- if (btree_node_need_write(b)) {
- if (btree_node_may_write(b)) {
- rcu_read_unlock();
- btree_node_lock_type(c, b, SIX_LOCK_read);
- bch2_btree_node_write(c, b, SIX_LOCK_read);
- six_unlock_read(&b->lock);
- goto again;
- } else {
- nodes_unwritten = true;
- }
- }
- rcu_read_unlock();
-
- if (c->btree_roots_dirty) {
- bch2_journal_meta(&c->journal);
- goto again;
- }
-
- return !nodes_unwritten &&
- !bch2_btree_interior_updates_nr_pending(c);
-}
-
-static void allocator_start_issue_discards(struct bch_fs *c)
-{
- struct bch_dev *ca;
- unsigned dev_iter;
- size_t bu;
-
- for_each_rw_member(ca, c, dev_iter)
- while (fifo_pop(&ca->free_inc, bu))
- blkdev_issue_discard(ca->disk_sb.bdev,
- bucket_to_sector(ca, bu),
- ca->mi.bucket_size, GFP_NOIO, 0);
-}
-
-static int resize_free_inc(struct bch_dev *ca)
+void bch2_fs_allocator_background_init(struct bch_fs *c)
{
- alloc_fifo free_inc;
-
- if (!fifo_full(&ca->free_inc))
- return 0;
-
- if (!init_fifo(&free_inc,
- ca->free_inc.size * 2,
- GFP_KERNEL))
- return -ENOMEM;
-
- fifo_move(&free_inc, &ca->free_inc);
- swap(free_inc, ca->free_inc);
- free_fifo(&free_inc);
- return 0;
+ spin_lock_init(&c->freelist_lock);
}
-static bool bch2_fs_allocator_start_fast(struct bch_fs *c)
+void bch2_open_buckets_to_text(struct printbuf *out, struct bch_fs *c)
{
- struct bch_dev *ca;
- unsigned dev_iter;
- bool ret = true;
-
- if (test_alloc_startup(c))
- return false;
-
- down_read(&c->gc_lock);
-
- /* Scan for buckets that are already invalidated: */
- for_each_rw_member(ca, c, dev_iter) {
- struct bucket_array *buckets;
- struct bucket_mark m;
- long bu;
-
- down_read(&ca->bucket_lock);
- buckets = bucket_array(ca);
-
- for (bu = buckets->first_bucket;
- bu < buckets->nbuckets; bu++) {
- m = READ_ONCE(buckets->b[bu].mark);
-
- if (!buckets->b[bu].gen_valid ||
- !is_available_bucket(m) ||
- m.cached_sectors ||
- (ca->buckets_nouse &&
- test_bit(bu, ca->buckets_nouse)))
- continue;
-
- percpu_down_read(&c->mark_lock);
- bch2_mark_alloc_bucket(c, ca, bu, true,
- gc_pos_alloc(c, NULL), 0);
- percpu_up_read(&c->mark_lock);
-
- fifo_push(&ca->free_inc, bu);
-
- discard_invalidated_buckets(c, ca);
+ struct open_bucket *ob;
- if (fifo_full(&ca->free[RESERVE_BTREE]))
- break;
+ 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) {
+ pr_buf(out, "%zu ref %u type %s\n",
+ ob - c->open_buckets,
+ atomic_read(&ob->pin),
+ bch2_data_types[ob->type]);
}
- up_read(&ca->bucket_lock);
+ spin_unlock(&ob->lock);
}
- up_read(&c->gc_lock);
-
- /* did we find enough buckets? */
- for_each_rw_member(ca, c, dev_iter)
- if (!fifo_full(&ca->free[RESERVE_BTREE]))
- ret = false;
-
- return ret;
-}
-
-int bch2_fs_allocator_start(struct bch_fs *c)
-{
- struct bch_dev *ca;
- unsigned dev_iter;
- u64 journal_seq = 0;
- bool wrote;
- long bu;
- int ret = 0;
-
- if (!test_alloc_startup(c) &&
- bch2_fs_allocator_start_fast(c))
- return 0;
-
- pr_debug("not enough empty buckets; scanning for reclaimable buckets");
-
- /*
- * We're moving buckets to freelists _before_ they've been marked as
- * invalidated on disk - we have to so that we can allocate new btree
- * nodes to mark them as invalidated on disk.
- *
- * However, we can't _write_ to any of these buckets yet - they might
- * have cached data in them, which is live until they're marked as
- * invalidated on disk:
- */
- set_bit(BCH_FS_HOLD_BTREE_WRITES, &c->flags);
-
- down_read(&c->gc_lock);
- do {
- wrote = false;
-
- for_each_rw_member(ca, c, dev_iter) {
- find_reclaimable_buckets(c, ca);
-
- while (!fifo_full(&ca->free[RESERVE_BTREE]) &&
- (bu = next_alloc_bucket(ca)) >= 0) {
- ret = resize_free_inc(ca);
- if (ret) {
- percpu_ref_put(&ca->io_ref);
- up_read(&c->gc_lock);
- goto err;
- }
-
- bch2_invalidate_one_bucket(c, ca, bu,
- &journal_seq);
-
- fifo_push(&ca->free[RESERVE_BTREE], bu);
- }
- }
-
- pr_debug("done scanning for reclaimable buckets");
-
- /*
- * XXX: it's possible for this to deadlock waiting on journal reclaim,
- * since we're holding btree writes. What then?
- */
- ret = bch2_alloc_write(c,
- BTREE_INSERT_NOCHECK_RW|
- BTREE_INSERT_USE_ALLOC_RESERVE|
- BTREE_INSERT_NOWAIT, &wrote);
-
- /*
- * If bch2_alloc_write() did anything, it may have used some
- * buckets, and we need the RESERVE_BTREE freelist full - so we
- * need to loop and scan again.
- * And if it errored, it may have been because there weren't
- * enough buckets, so just scan and loop again as long as it
- * made some progress:
- */
- } while (wrote);
- up_read(&c->gc_lock);
-
- if (ret)
- goto err;
-
- pr_debug("flushing journal");
-
- ret = bch2_journal_flush(&c->journal);
- if (ret)
- goto err;
-
- pr_debug("issuing discards");
- allocator_start_issue_discards(c);
-err:
- clear_bit(BCH_FS_HOLD_BTREE_WRITES, &c->flags);
- closure_wait_event(&c->btree_interior_update_wait,
- flush_held_btree_writes(c));
-
- return ret;
-}
-
-void bch2_fs_allocator_background_init(struct bch_fs *c)
-{
- spin_lock_init(&c->freelist_lock);
- bch2_bucket_clock_init(c, READ);
- bch2_bucket_clock_init(c, WRITE);
-
- c->pd_controllers_update_seconds = 5;
- INIT_DELAYED_WORK(&c->pd_controllers_update, pd_controllers_update);
}
projects / bcachefs-tools-debian / blobdiff