// SPDX-License-Identifier: GPL-2.0
/*
- * Primary bucket allocation code
- *
* Copyright 2012 Google, Inc.
*
- * Allocation in bcache is done in terms of buckets:
- *
- * Each bucket has associated an 8 bit gen; this gen corresponds to the gen in
- * btree pointers - they must match for the pointer to be considered valid.
- *
- * Thus (assuming a bucket has no dirty data or metadata in it) we can reuse a
- * bucket simply by incrementing its gen.
- *
- * The gens (along with the priorities; it's really the gens are important but
- * the code is named as if it's the priorities) are written in an arbitrary list
- * of buckets on disk, with a pointer to them in the journal header.
- *
- * When we invalidate a bucket, we have to write its new gen to disk and wait
- * for that write to complete before we use it - otherwise after a crash we
- * could have pointers that appeared to be good but pointed to data that had
- * been overwritten.
- *
- * Since the gens and priorities are all stored contiguously on disk, we can
- * batch this up: We fill up the free_inc list with freshly invalidated buckets,
- * call prio_write(), and when prio_write() finishes we pull buckets off the
- * free_inc list and optionally discard them.
- *
- * free_inc isn't the only freelist - if it was, we'd often have to sleep while
- * priorities and gens were being written before we could allocate. c->free is a
- * smaller freelist, and buckets on that list are always ready to be used.
- *
- * If we've got discards enabled, that happens when a bucket moves from the
- * free_inc list to the free list.
- *
- * It's important to ensure that gens don't wrap around - with respect to
- * either the oldest gen in the btree or the gen on disk. This is quite
- * difficult to do in practice, but we explicitly guard against it anyways - if
- * a bucket is in danger of wrapping around we simply skip invalidating it that
- * time around, and we garbage collect or rewrite the priorities sooner than we
- * would have otherwise.
+ * Foreground allocator code: allocate buckets from freelist, and allocate in
+ * sector granularity from writepoints.
*
* bch2_bucket_alloc() allocates a single bucket from a specific device.
*
* bch2_bucket_alloc_set() allocates one or more buckets from different devices
* in a given filesystem.
- *
- * invalidate_buckets() drives all the processes described above. It's called
- * from bch2_bucket_alloc() and a few other places that need to make sure free
- * buckets are ready.
- *
- * invalidate_buckets_(lru|fifo)() find buckets that are available to be
- * invalidated, and then invalidate them and stick them on the free_inc list -
- * in either lru or fifo order.
*/
#include "bcachefs.h"
#include "alloc_background.h"
#include "alloc_foreground.h"
+#include "btree_iter.h"
+#include "btree_update.h"
#include "btree_gc.h"
#include "buckets.h"
+#include "buckets_waiting_for_journal.h"
#include "clock.h"
#include "debug.h"
#include "disk_groups.h"
#include "ec.h"
+#include "error.h"
#include "io.h"
+#include "journal.h"
+#include "movinggc.h"
#include <linux/math64.h>
#include <linux/rculist.h>
#include <linux/rcupdate.h>
#include <trace/events/bcachefs.h>
+const char * const bch2_alloc_reserves[] = {
+#define x(t) #t,
+ BCH_ALLOC_RESERVES()
+#undef x
+ NULL
+};
+
/*
* Open buckets represent a bucket that's currently being allocated from. They
* serve two purposes:
* reference _after_ doing the index update that makes its allocation reachable.
*/
+static void bch2_open_bucket_hash_add(struct bch_fs *c, struct open_bucket *ob)
+{
+ open_bucket_idx_t idx = ob - c->open_buckets;
+ open_bucket_idx_t *slot = open_bucket_hashslot(c, ob->dev, ob->bucket);
+
+ ob->hash = *slot;
+ *slot = idx;
+}
+
+static void bch2_open_bucket_hash_remove(struct bch_fs *c, struct open_bucket *ob)
+{
+ open_bucket_idx_t idx = ob - c->open_buckets;
+ open_bucket_idx_t *slot = open_bucket_hashslot(c, ob->dev, ob->bucket);
+
+ while (*slot != idx) {
+ BUG_ON(!*slot);
+ slot = &c->open_buckets[*slot].hash;
+ }
+
+ *slot = ob->hash;
+ ob->hash = 0;
+}
+
void __bch2_open_bucket_put(struct bch_fs *c, struct open_bucket *ob)
{
- struct bch_dev *ca = bch_dev_bkey_exists(c, ob->ptr.dev);
+ struct bch_dev *ca = bch_dev_bkey_exists(c, ob->dev);
if (ob->ec) {
bch2_ec_bucket_written(c, ob);
percpu_down_read(&c->mark_lock);
spin_lock(&ob->lock);
- bch2_mark_alloc_bucket(c, ca, PTR_BUCKET_NR(ca, &ob->ptr),
- false, gc_pos_alloc(c, ob), 0);
ob->valid = false;
- ob->type = 0;
+ ob->data_type = 0;
spin_unlock(&ob->lock);
percpu_up_read(&c->mark_lock);
spin_lock(&c->freelist_lock);
+ bch2_open_bucket_hash_remove(c, ob);
+
ob->freelist = c->open_buckets_freelist;
c->open_buckets_freelist = ob - c->open_buckets;
+
c->open_buckets_nr_free++;
+ ca->nr_open_buckets--;
spin_unlock(&c->freelist_lock);
closure_wake_up(&c->open_buckets_wait);
unsigned i;
open_bucket_for_each(c, obs, ob, i)
- if (ob->ptr.dev == dev &&
- ob->ec)
+ if (ob->dev == dev && ob->ec)
bch2_ec_bucket_cancel(c, ob);
}
ob = c->open_buckets + c->open_buckets_freelist;
c->open_buckets_freelist = ob->freelist;
atomic_set(&ob->pin, 1);
- ob->type = 0;
+ ob->data_type = 0;
c->open_buckets_nr_free--;
return ob;
struct write_point *wp,
struct open_bucket *ob)
{
- struct bch_dev *ca = bch_dev_bkey_exists(c, ob->ptr.dev);
- bool may_realloc = wp->type == BCH_DATA_user;
+ struct bch_dev *ca = bch_dev_bkey_exists(c, ob->dev);
+ bool may_realloc = wp->data_type == BCH_DATA_user;
BUG_ON(ca->open_buckets_partial_nr >
ARRAY_SIZE(ca->open_buckets_partial));
}
}
-static void verify_not_stale(struct bch_fs *c, const struct open_buckets *obs)
-{
-#ifdef CONFIG_BCACHEFS_DEBUG
- struct open_bucket *ob;
- unsigned i;
-
- open_bucket_for_each(c, obs, ob, i) {
- struct bch_dev *ca = bch_dev_bkey_exists(c, ob->ptr.dev);
-
- BUG_ON(ptr_stale(ca, &ob->ptr));
- }
-#endif
-}
-
/* _only_ for allocating the journal on a new device: */
long bch2_bucket_alloc_new_fs(struct bch_dev *ca)
{
- struct bucket_array *buckets;
- ssize_t b;
+ while (ca->new_fs_bucket_idx < ca->mi.nbuckets) {
+ u64 b = ca->new_fs_bucket_idx++;
- rcu_read_lock();
- buckets = bucket_array(ca);
+ if (!is_superblock_bucket(ca, b) &&
+ (!ca->buckets_nouse || !test_bit(b, ca->buckets_nouse)))
+ return b;
+ }
- for (b = ca->mi.first_bucket; b < ca->mi.nbuckets; b++)
- if (is_available_bucket(buckets->b[b].mark))
- goto success;
- b = -1;
-success:
- rcu_read_unlock();
- return b;
+ return -1;
}
static inline unsigned open_buckets_reserved(enum alloc_reserve reserve)
{
switch (reserve) {
- case RESERVE_BTREE:
- case RESERVE_BTREE_MOVINGGC:
+ case RESERVE_btree:
+ case RESERVE_btree_movinggc:
return 0;
- case RESERVE_MOVINGGC:
+ case RESERVE_movinggc:
return OPEN_BUCKETS_COUNT / 4;
default:
return OPEN_BUCKETS_COUNT / 2;
}
}
-/**
- * bch_bucket_alloc - allocate a single bucket from a specific device
- *
- * Returns index of bucket on success, 0 on failure
- * */
-struct open_bucket *bch2_bucket_alloc(struct bch_fs *c, struct bch_dev *ca,
- enum alloc_reserve reserve,
- bool may_alloc_partial,
- struct closure *cl)
+static struct open_bucket *__try_alloc_bucket(struct bch_fs *c, struct bch_dev *ca,
+ u64 bucket,
+ enum alloc_reserve reserve,
+ struct bch_alloc_v4 *a,
+ u64 *skipped_open,
+ u64 *skipped_need_journal_commit,
+ u64 *skipped_nouse,
+ struct closure *cl)
{
- struct bucket_array *buckets;
struct open_bucket *ob;
- long bucket = 0;
- spin_lock(&c->freelist_lock);
+ if (unlikely(ca->buckets_nouse && test_bit(bucket, ca->buckets_nouse))) {
+ (*skipped_nouse)++;
+ return NULL;
+ }
- if (may_alloc_partial) {
- int i;
-
- for (i = ca->open_buckets_partial_nr - 1; i >= 0; --i) {
- ob = c->open_buckets + ca->open_buckets_partial[i];
-
- if (reserve <= ob->alloc_reserve) {
- array_remove_item(ca->open_buckets_partial,
- ca->open_buckets_partial_nr,
- i);
- ob->on_partial_list = false;
- ob->alloc_reserve = reserve;
- spin_unlock(&c->freelist_lock);
- return ob;
- }
- }
+ if (bch2_bucket_is_open(c, ca->dev_idx, bucket)) {
+ (*skipped_open)++;
+ return NULL;
+ }
+
+ if (bch2_bucket_needs_journal_commit(&c->buckets_waiting_for_journal,
+ c->journal.flushed_seq_ondisk, ca->dev_idx, bucket)) {
+ (*skipped_need_journal_commit)++;
+ return NULL;
}
+ spin_lock(&c->freelist_lock);
+
if (unlikely(c->open_buckets_nr_free <= open_buckets_reserved(reserve))) {
if (cl)
closure_wait(&c->open_buckets_wait, cl);
c->blocked_allocate_open_bucket = local_clock();
spin_unlock(&c->freelist_lock);
- trace_open_bucket_alloc_fail(ca, reserve);
- return ERR_PTR(-OPEN_BUCKETS_EMPTY);
+ return ERR_PTR(-BCH_ERR_open_buckets_empty);
}
- if (likely(fifo_pop(&ca->free[RESERVE_NONE], bucket)))
- goto out;
-
- switch (reserve) {
- case RESERVE_BTREE_MOVINGGC:
- case RESERVE_MOVINGGC:
- if (fifo_pop(&ca->free[RESERVE_MOVINGGC], bucket))
- goto out;
- break;
- default:
- break;
+ /* Recheck under lock: */
+ if (bch2_bucket_is_open(c, ca->dev_idx, bucket)) {
+ spin_unlock(&c->freelist_lock);
+ (*skipped_open)++;
+ return NULL;
}
- if (cl)
- closure_wait(&c->freelist_wait, cl);
-
- if (!c->blocked_allocate)
- c->blocked_allocate = local_clock();
-
- spin_unlock(&c->freelist_lock);
-
- trace_bucket_alloc_fail(ca, reserve);
- return ERR_PTR(-FREELIST_EMPTY);
-out:
- verify_not_on_freelist(c, ca, bucket);
-
ob = bch2_open_bucket_alloc(c);
spin_lock(&ob->lock);
- buckets = bucket_array(ca);
ob->valid = true;
ob->sectors_free = ca->mi.bucket_size;
ob->alloc_reserve = reserve;
- ob->ptr = (struct bch_extent_ptr) {
- .type = 1 << BCH_EXTENT_ENTRY_ptr,
- .gen = buckets->b[bucket].mark.gen,
- .offset = bucket_to_sector(ca, bucket),
- .dev = ca->dev_idx,
- };
-
+ ob->dev = ca->dev_idx;
+ ob->gen = a->gen;
+ ob->bucket = bucket;
spin_unlock(&ob->lock);
+ ca->nr_open_buckets++;
+ bch2_open_bucket_hash_add(c, ob);
+
if (c->blocked_allocate_open_bucket) {
bch2_time_stats_update(
&c->times[BCH_TIME_blocked_allocate_open_bucket],
spin_unlock(&c->freelist_lock);
- bch2_wake_allocator(ca);
+ return ob;
+}
+
+static struct open_bucket *try_alloc_bucket(struct btree_trans *trans, struct bch_dev *ca,
+ enum alloc_reserve reserve, u64 free_entry,
+ u64 *skipped_open,
+ u64 *skipped_need_journal_commit,
+ u64 *skipped_nouse,
+ struct bkey_s_c freespace_k,
+ struct closure *cl)
+{
+ struct bch_fs *c = trans->c;
+ struct btree_iter iter = { NULL };
+ struct bkey_s_c k;
+ struct open_bucket *ob;
+ struct bch_alloc_v4 a;
+ u64 b = free_entry & ~(~0ULL << 56);
+ unsigned genbits = free_entry >> 56;
+ struct printbuf buf = PRINTBUF;
+ int ret;
+
+ if (b < ca->mi.first_bucket || b >= ca->mi.nbuckets) {
+ prt_printf(&buf, "freespace btree has bucket outside allowed range %u-%llu\n"
+ " freespace key ",
+ ca->mi.first_bucket, ca->mi.nbuckets);
+ bch2_bkey_val_to_text(&buf, c, freespace_k);
+ bch2_trans_inconsistent(trans, "%s", buf.buf);
+ ob = ERR_PTR(-EIO);
+ goto err;
+ }
+
+ bch2_trans_iter_init(trans, &iter, BTREE_ID_alloc, POS(ca->dev_idx, b), BTREE_ITER_CACHED);
+ k = bch2_btree_iter_peek_slot(&iter);
+ ret = bkey_err(k);
+ if (ret) {
+ ob = ERR_PTR(ret);
+ goto err;
+ }
+
+ bch2_alloc_to_v4(k, &a);
+
+ if (genbits != (alloc_freespace_genbits(a) >> 56)) {
+ prt_printf(&buf, "bucket in freespace btree with wrong genbits (got %u should be %llu)\n"
+ " freespace key ",
+ genbits, alloc_freespace_genbits(a) >> 56);
+ bch2_bkey_val_to_text(&buf, c, freespace_k);
+ prt_printf(&buf, "\n ");
+ bch2_bkey_val_to_text(&buf, c, k);
+ bch2_trans_inconsistent(trans, "%s", buf.buf);
+ ob = ERR_PTR(-EIO);
+ goto err;
+
+ }
+
+ if (a.data_type != BCH_DATA_free) {
+ prt_printf(&buf, "non free bucket in freespace btree\n"
+ " freespace key ");
+ bch2_bkey_val_to_text(&buf, c, freespace_k);
+ prt_printf(&buf, "\n ");
+ bch2_bkey_val_to_text(&buf, c, k);
+ bch2_trans_inconsistent(trans, "%s", buf.buf);
+ ob = ERR_PTR(-EIO);
+ goto err;
+ }
+
+ ob = __try_alloc_bucket(c, ca, b, reserve, &a,
+ skipped_open,
+ skipped_need_journal_commit,
+ skipped_nouse,
+ cl);
+ if (!ob)
+ iter.path->preserve = false;
+err:
+ set_btree_iter_dontneed(&iter);
+ bch2_trans_iter_exit(trans, &iter);
+ printbuf_exit(&buf);
+ return ob;
+}
+
+static struct open_bucket *try_alloc_partial_bucket(struct bch_fs *c, struct bch_dev *ca,
+ enum alloc_reserve reserve)
+{
+ struct open_bucket *ob;
+ int i;
+
+ spin_lock(&c->freelist_lock);
+
+ for (i = ca->open_buckets_partial_nr - 1; i >= 0; --i) {
+ ob = c->open_buckets + ca->open_buckets_partial[i];
+
+ if (reserve <= ob->alloc_reserve) {
+ array_remove_item(ca->open_buckets_partial,
+ ca->open_buckets_partial_nr,
+ i);
+ ob->on_partial_list = false;
+ ob->alloc_reserve = reserve;
+ spin_unlock(&c->freelist_lock);
+ return ob;
+ }
+ }
+
+ spin_unlock(&c->freelist_lock);
+ return NULL;
+}
+
+/*
+ * This path is for before the freespace btree is initialized:
+ *
+ * If ca->new_fs_bucket_idx is nonzero, we haven't yet marked superblock &
+ * journal buckets - journal buckets will be < ca->new_fs_bucket_idx
+ */
+static noinline struct open_bucket *
+bch2_bucket_alloc_early(struct btree_trans *trans,
+ struct bch_dev *ca,
+ enum alloc_reserve reserve,
+ u64 *cur_bucket,
+ u64 *buckets_seen,
+ u64 *skipped_open,
+ u64 *skipped_need_journal_commit,
+ u64 *skipped_nouse,
+ struct closure *cl)
+{
+ struct btree_iter iter;
+ struct bkey_s_c k;
+ struct open_bucket *ob = NULL;
+ int ret;
+
+ *cur_bucket = max_t(u64, *cur_bucket, ca->mi.first_bucket);
+ *cur_bucket = max_t(u64, *cur_bucket, ca->new_fs_bucket_idx);
+
+ for_each_btree_key_norestart(trans, iter, BTREE_ID_alloc, POS(ca->dev_idx, *cur_bucket),
+ BTREE_ITER_SLOTS, k, ret) {
+ struct bch_alloc_v4 a;
+
+ if (bkey_cmp(k.k->p, POS(ca->dev_idx, ca->mi.nbuckets)) >= 0)
+ break;
+
+ if (ca->new_fs_bucket_idx &&
+ is_superblock_bucket(ca, k.k->p.offset))
+ continue;
+
+ bch2_alloc_to_v4(k, &a);
+
+ if (a.data_type != BCH_DATA_free)
+ continue;
+
+ (*buckets_seen)++;
+
+ ob = __try_alloc_bucket(trans->c, ca, k.k->p.offset, reserve, &a,
+ skipped_open,
+ skipped_need_journal_commit,
+ skipped_nouse,
+ cl);
+ if (ob)
+ break;
+ }
+ bch2_trans_iter_exit(trans, &iter);
+
+ *cur_bucket = iter.pos.offset;
+
+ return ob ?: ERR_PTR(ret ?: -BCH_ERR_no_buckets_found);
+}
+
+static struct open_bucket *bch2_bucket_alloc_freelist(struct btree_trans *trans,
+ struct bch_dev *ca,
+ enum alloc_reserve reserve,
+ u64 *cur_bucket,
+ u64 *buckets_seen,
+ u64 *skipped_open,
+ u64 *skipped_need_journal_commit,
+ u64 *skipped_nouse,
+ struct closure *cl)
+{
+ struct btree_iter iter;
+ struct bkey_s_c k;
+ struct open_bucket *ob = NULL;
+ int ret;
+
+ BUG_ON(ca->new_fs_bucket_idx);
+
+ /*
+ * XXX:
+ * On transaction restart, we'd like to restart from the bucket we were
+ * at previously
+ */
+ for_each_btree_key_norestart(trans, iter, BTREE_ID_freespace,
+ POS(ca->dev_idx, *cur_bucket), 0, k, ret) {
+ if (k.k->p.inode != ca->dev_idx)
+ break;
+
+ for (*cur_bucket = max(*cur_bucket, bkey_start_offset(k.k));
+ *cur_bucket < k.k->p.offset;
+ (*cur_bucket)++) {
+ ret = btree_trans_too_many_iters(trans);
+ if (ret)
+ break;
+
+ (*buckets_seen)++;
+
+ ob = try_alloc_bucket(trans, ca, reserve,
+ *cur_bucket,
+ skipped_open,
+ skipped_need_journal_commit,
+ skipped_nouse,
+ k, cl);
+ if (ob)
+ break;
+ }
+
+ if (ob || ret)
+ break;
+ }
+ bch2_trans_iter_exit(trans, &iter);
+
+ return ob ?: ERR_PTR(ret);
+}
+
+/**
+ * bch_bucket_alloc - allocate a single bucket from a specific device
+ *
+ * Returns index of bucket on success, 0 on failure
+ */
+static struct open_bucket *bch2_bucket_alloc_trans(struct btree_trans *trans,
+ struct bch_dev *ca,
+ enum alloc_reserve reserve,
+ bool may_alloc_partial,
+ struct closure *cl,
+ struct bch_dev_usage *usage)
+{
+ struct bch_fs *c = trans->c;
+ struct open_bucket *ob = NULL;
+ bool freespace_initialized = READ_ONCE(ca->mi.freespace_initialized);
+ u64 start = freespace_initialized ? 0 : ca->bucket_alloc_trans_early_cursor;
+ u64 avail;
+ u64 cur_bucket = start;
+ u64 buckets_seen = 0;
+ u64 skipped_open = 0;
+ u64 skipped_need_journal_commit = 0;
+ u64 skipped_nouse = 0;
+ bool waiting = false;
+again:
+ bch2_dev_usage_read_fast(ca, usage);
+ avail = dev_buckets_free(ca, *usage, reserve);
+
+ if (usage->d[BCH_DATA_need_discard].buckets > avail)
+ bch2_do_discards(c);
+
+ if (usage->d[BCH_DATA_need_gc_gens].buckets > avail)
+ bch2_do_gc_gens(c);
+
+ if (should_invalidate_buckets(ca, *usage))
+ bch2_do_invalidates(c);
+
+ if (!avail) {
+ if (cl && !waiting) {
+ closure_wait(&c->freelist_wait, cl);
+ waiting = true;
+ goto again;
+ }
+
+ if (!c->blocked_allocate)
+ c->blocked_allocate = local_clock();
+
+ ob = ERR_PTR(-BCH_ERR_freelist_empty);
+ goto err;
+ }
+
+ if (waiting)
+ closure_wake_up(&c->freelist_wait);
+
+ if (may_alloc_partial) {
+ ob = try_alloc_partial_bucket(c, ca, reserve);
+ if (ob)
+ return ob;
+ }
+
+ ob = likely(ca->mi.freespace_initialized)
+ ? bch2_bucket_alloc_freelist(trans, ca, reserve,
+ &cur_bucket,
+ &buckets_seen,
+ &skipped_open,
+ &skipped_need_journal_commit,
+ &skipped_nouse,
+ cl)
+ : bch2_bucket_alloc_early(trans, ca, reserve,
+ &cur_bucket,
+ &buckets_seen,
+ &skipped_open,
+ &skipped_need_journal_commit,
+ &skipped_nouse,
+ cl);
+
+ if (skipped_need_journal_commit * 2 > avail)
+ bch2_journal_flush_async(&c->journal, NULL);
+
+ if (!ob && !freespace_initialized && start) {
+ start = cur_bucket = 0;
+ goto again;
+ }
+
+ if (!freespace_initialized)
+ ca->bucket_alloc_trans_early_cursor = cur_bucket;
+err:
+ if (!ob)
+ ob = ERR_PTR(-BCH_ERR_no_buckets_found);
+
+ if (!IS_ERR(ob))
+ trace_and_count(c, bucket_alloc, ca, bch2_alloc_reserves[reserve],
+ may_alloc_partial, ob->bucket);
+ else if (!bch2_err_matches(PTR_ERR(ob), BCH_ERR_transaction_restart))
+ trace_and_count(c, bucket_alloc_fail,
+ ca, bch2_alloc_reserves[reserve],
+ usage->d[BCH_DATA_free].buckets,
+ avail,
+ bch2_copygc_wait_amount(c),
+ c->copygc_wait - atomic64_read(&c->io_clock[WRITE].now),
+ buckets_seen,
+ skipped_open,
+ skipped_need_journal_commit,
+ skipped_nouse,
+ cl == NULL,
+ bch2_err_str(PTR_ERR(ob)));
- trace_bucket_alloc(ca, reserve);
+ return ob;
+}
+
+struct open_bucket *bch2_bucket_alloc(struct bch_fs *c, struct bch_dev *ca,
+ enum alloc_reserve reserve,
+ bool may_alloc_partial,
+ struct closure *cl)
+{
+ struct bch_dev_usage usage;
+ struct open_bucket *ob;
+
+ bch2_trans_do(c, NULL, NULL, 0,
+ PTR_ERR_OR_ZERO(ob = bch2_bucket_alloc_trans(&trans, ca, reserve,
+ may_alloc_partial, cl, &usage)));
return ob;
}
return ret;
}
-void bch2_dev_stripe_increment(struct bch_dev *ca,
- struct dev_stripe_state *stripe)
+static inline void bch2_dev_stripe_increment_inlined(struct bch_dev *ca,
+ struct dev_stripe_state *stripe,
+ struct bch_dev_usage *usage)
{
u64 *v = stripe->next_alloc + ca->dev_idx;
- u64 free_space = dev_buckets_free(ca);
+ u64 free_space = dev_buckets_available(ca, RESERVE_none);
u64 free_space_inv = free_space
? div64_u64(1ULL << 48, free_space)
: 1ULL << 48;
*v = *v < scale ? 0 : *v - scale;
}
+void bch2_dev_stripe_increment(struct bch_dev *ca,
+ struct dev_stripe_state *stripe)
+{
+ struct bch_dev_usage usage;
+
+ bch2_dev_usage_read_fast(ca, &usage);
+ bch2_dev_stripe_increment_inlined(ca, stripe, &usage);
+}
+
#define BUCKET_MAY_ALLOC_PARTIAL (1 << 0)
#define BUCKET_ALLOC_USE_DURABILITY (1 << 1)
struct open_bucket *ob)
{
unsigned durability =
- bch_dev_bkey_exists(c, ob->ptr.dev)->mi.durability;
+ bch_dev_bkey_exists(c, ob->dev)->mi.durability;
- __clear_bit(ob->ptr.dev, devs_may_alloc->d);
+ __clear_bit(ob->dev, devs_may_alloc->d);
*nr_effective += (flags & BUCKET_ALLOC_USE_DURABILITY)
? durability : 1;
*have_cache |= !durability;
ob_push(c, ptrs, ob);
}
-enum bucket_alloc_ret
-bch2_bucket_alloc_set(struct bch_fs *c,
+static int bch2_bucket_alloc_set_trans(struct btree_trans *trans,
struct open_buckets *ptrs,
struct dev_stripe_state *stripe,
struct bch_devs_mask *devs_may_alloc,
unsigned flags,
struct closure *cl)
{
+ struct bch_fs *c = trans->c;
struct dev_alloc_list devs_sorted =
bch2_dev_alloc_list(c, stripe, devs_may_alloc);
+ unsigned dev;
struct bch_dev *ca;
- enum bucket_alloc_ret ret = INSUFFICIENT_DEVICES;
+ int ret = -BCH_ERR_insufficient_devices;
unsigned i;
BUG_ON(*nr_effective >= nr_replicas);
for (i = 0; i < devs_sorted.nr; i++) {
+ struct bch_dev_usage usage;
struct open_bucket *ob;
- ca = rcu_dereference(c->devs[devs_sorted.devs[i]]);
+ dev = devs_sorted.devs[i];
+
+ rcu_read_lock();
+ ca = rcu_dereference(c->devs[dev]);
+ if (ca)
+ percpu_ref_get(&ca->ref);
+ rcu_read_unlock();
+
if (!ca)
continue;
- if (!ca->mi.durability && *have_cache)
+ if (!ca->mi.durability && *have_cache) {
+ percpu_ref_put(&ca->ref);
continue;
+ }
- ob = bch2_bucket_alloc(c, ca, reserve,
- flags & BUCKET_MAY_ALLOC_PARTIAL, cl);
- if (IS_ERR(ob)) {
- ret = -PTR_ERR(ob);
+ ob = bch2_bucket_alloc_trans(trans, ca, reserve,
+ flags & BUCKET_MAY_ALLOC_PARTIAL, cl, &usage);
+ if (!IS_ERR(ob))
+ bch2_dev_stripe_increment_inlined(ca, stripe, &usage);
+ percpu_ref_put(&ca->ref);
- if (cl)
- return ret;
+ if (IS_ERR(ob)) {
+ ret = PTR_ERR(ob);
+ if (bch2_err_matches(ret, BCH_ERR_transaction_restart) || cl)
+ break;
continue;
}
add_new_bucket(c, ptrs, devs_may_alloc,
nr_effective, have_cache, flags, ob);
- bch2_dev_stripe_increment(ca, stripe);
-
- if (*nr_effective >= nr_replicas)
- return ALLOC_SUCCESS;
+ if (*nr_effective >= nr_replicas) {
+ ret = 0;
+ break;
+ }
}
return ret;
}
+int bch2_bucket_alloc_set(struct bch_fs *c,
+ struct open_buckets *ptrs,
+ struct dev_stripe_state *stripe,
+ struct bch_devs_mask *devs_may_alloc,
+ unsigned nr_replicas,
+ unsigned *nr_effective,
+ bool *have_cache,
+ enum alloc_reserve reserve,
+ unsigned flags,
+ struct closure *cl)
+{
+ return bch2_trans_do(c, NULL, NULL, 0,
+ bch2_bucket_alloc_set_trans(&trans, ptrs, stripe,
+ devs_may_alloc, nr_replicas,
+ nr_effective, have_cache, reserve,
+ flags, cl));
+}
+
/* Allocate from stripes: */
/*
* it's to a device we don't want:
*/
-static enum bucket_alloc_ret
-bucket_alloc_from_stripe(struct bch_fs *c,
+static int bucket_alloc_from_stripe(struct bch_fs *c,
struct open_buckets *ptrs,
struct write_point *wp,
struct bch_devs_mask *devs_may_alloc,
devs_sorted = bch2_dev_alloc_list(c, &wp->stripe, devs_may_alloc);
for (i = 0; i < devs_sorted.nr; i++)
- open_bucket_for_each(c, &h->s->blocks, ob, ec_idx)
- if (ob->ptr.dev == devs_sorted.devs[i] &&
- !test_and_set_bit(h->s->data_block_idx[ec_idx],
- h->s->blocks_allocated))
+ for (ec_idx = 0; ec_idx < h->s->nr_data; ec_idx++) {
+ if (!h->s->blocks[ec_idx])
+ continue;
+
+ ob = c->open_buckets + h->s->blocks[ec_idx];
+ if (ob->dev == devs_sorted.devs[i] &&
+ !test_and_set_bit(ec_idx, h->s->blocks_allocated))
goto got_bucket;
+ }
goto out_put_head;
got_bucket:
- ca = bch_dev_bkey_exists(c, ob->ptr.dev);
+ ca = bch_dev_bkey_exists(c, ob->dev);
- ob->ec_idx = h->s->data_block_idx[ec_idx];
+ ob->ec_idx = ec_idx;
ob->ec = h->s;
add_new_bucket(c, ptrs, devs_may_alloc,
unsigned i;
open_bucket_for_each(c, &wp->ptrs, ob, i) {
- struct bch_dev *ca = bch_dev_bkey_exists(c, ob->ptr.dev);
+ struct bch_dev *ca = bch_dev_bkey_exists(c, ob->dev);
if (*nr_effective < nr_replicas &&
- test_bit(ob->ptr.dev, devs_may_alloc->d) &&
+ test_bit(ob->dev, devs_may_alloc->d) &&
(ca->mi.durability ||
- (wp->type == BCH_DATA_user && !*have_cache)) &&
+ (wp->data_type == BCH_DATA_user && !*have_cache)) &&
(ob->ec || !need_ec)) {
add_new_bucket(c, ptrs, devs_may_alloc,
nr_effective, have_cache,
wp->ptrs = ptrs_skip;
}
-static enum bucket_alloc_ret
-open_bucket_add_buckets(struct bch_fs *c,
+static int open_bucket_add_buckets(struct btree_trans *trans,
struct open_buckets *ptrs,
struct write_point *wp,
struct bch_devs_list *devs_have,
unsigned flags,
struct closure *_cl)
{
+ struct bch_fs *c = trans->c;
struct bch_devs_mask devs;
struct open_bucket *ob;
struct closure *cl = NULL;
- enum bucket_alloc_ret ret;
+ int ret;
unsigned i;
rcu_read_lock();
- devs = target_rw_devs(c, wp->type, target);
+ devs = target_rw_devs(c, wp->data_type, target);
rcu_read_unlock();
/* Don't allocate from devices we already have pointers to: */
__clear_bit(devs_have->devs[i], devs.d);
open_bucket_for_each(c, ptrs, ob, i)
- __clear_bit(ob->ptr.dev, devs.d);
+ __clear_bit(ob->dev, devs.d);
if (erasure_code) {
if (!ec_open_bucket(c, ptrs)) {
target, erasure_code,
nr_replicas, nr_effective,
have_cache, flags, _cl);
- if (ret == FREELIST_EMPTY ||
- ret == OPEN_BUCKETS_EMPTY)
+ if (bch2_err_matches(ret, BCH_ERR_transaction_restart) ||
+ bch2_err_matches(ret, BCH_ERR_freelist_empty) ||
+ bch2_err_matches(ret, BCH_ERR_open_buckets_empty))
return ret;
if (*nr_effective >= nr_replicas)
return 0;
if (*nr_effective >= nr_replicas)
return 0;
- percpu_down_read(&c->mark_lock);
- rcu_read_lock();
-
retry_blocking:
/*
* Try nonblocking first, so that if one device is full we'll try from
* other devices:
*/
- ret = bch2_bucket_alloc_set(c, ptrs, &wp->stripe, &devs,
+ ret = bch2_bucket_alloc_set_trans(trans, ptrs, &wp->stripe, &devs,
nr_replicas, nr_effective, have_cache,
reserve, flags, cl);
- if (ret && ret != INSUFFICIENT_DEVICES && !cl && _cl) {
+ if (ret &&
+ !bch2_err_matches(ret, BCH_ERR_transaction_restart) &&
+ !bch2_err_matches(ret, BCH_ERR_insufficient_devices) &&
+ !cl && _cl) {
cl = _cl;
goto retry_blocking;
}
- rcu_read_unlock();
- percpu_up_read(&c->mark_lock);
-
return ret;
}
unsigned i, j;
open_bucket_for_each(c, obs, ob, i) {
- bool drop = !ca || ob->ptr.dev == ca->dev_idx;
+ bool drop = !ca || ob->dev == ca->dev_idx;
if (!drop && ob->ec) {
mutex_lock(&ob->ec->lock);
- open_bucket_for_each(c, &ob->ec->blocks, ob2, j)
- drop |= ob2->ptr.dev == ca->dev_idx;
- open_bucket_for_each(c, &ob->ec->parity, ob2, j)
- drop |= ob2->ptr.dev == ca->dev_idx;
+ for (j = 0; j < ob->ec->new_stripe.key.v.nr_blocks; j++) {
+ if (!ob->ec->blocks[j])
+ continue;
+
+ ob2 = c->open_buckets + ob->ec->blocks[j];
+ drop |= ob2->dev == ca->dev_idx;
+ }
mutex_unlock(&ob->ec->lock);
}
{
struct write_point *wp;
+ rcu_read_lock();
hlist_for_each_entry_rcu(wp, head, node)
if (wp->write_point == write_point)
- return wp;
-
- return NULL;
+ goto out;
+ wp = NULL;
+out:
+ rcu_read_unlock();
+ return wp;
}
static inline bool too_many_writepoints(struct bch_fs *c, unsigned factor)
return true;
}
-static struct write_point *writepoint_find(struct bch_fs *c,
+static void bch2_trans_mutex_lock(struct btree_trans *trans,
+ struct mutex *lock)
+{
+ if (!mutex_trylock(lock)) {
+ bch2_trans_unlock(trans);
+ mutex_lock(lock);
+ }
+}
+
+static struct write_point *writepoint_find(struct btree_trans *trans,
unsigned long write_point)
{
+ struct bch_fs *c = trans->c;
struct write_point *wp, *oldest;
struct hlist_head *head;
if (!(write_point & 1UL)) {
wp = (struct write_point *) write_point;
- mutex_lock(&wp->lock);
+ bch2_trans_mutex_lock(trans, &wp->lock);
return wp;
}
wp = __writepoint_find(head, write_point);
if (wp) {
lock_wp:
- mutex_lock(&wp->lock);
+ bch2_trans_mutex_lock(trans, &wp->lock);
if (wp->write_point == write_point)
goto out;
mutex_unlock(&wp->lock);
if (!oldest || time_before64(wp->last_used, oldest->last_used))
oldest = wp;
- mutex_lock(&oldest->lock);
- mutex_lock(&c->write_points_hash_lock);
+ bch2_trans_mutex_lock(trans, &oldest->lock);
+ bch2_trans_mutex_lock(trans, &c->write_points_hash_lock);
if (oldest >= c->write_points + c->write_points_nr ||
try_increase_writepoints(c)) {
mutex_unlock(&c->write_points_hash_lock);
hlist_add_head_rcu(&wp->node, head);
mutex_unlock(&c->write_points_hash_lock);
out:
- wp->last_used = sched_clock();
+ wp->last_used = local_clock();
return wp;
}
/*
* Get us an open_bucket we can allocate from, return with it locked:
*/
-struct write_point *bch2_alloc_sectors_start(struct bch_fs *c,
+struct write_point *bch2_alloc_sectors_start_trans(struct btree_trans *trans,
unsigned target,
unsigned erasure_code,
struct write_point_specifier write_point,
unsigned flags,
struct closure *cl)
{
+ struct bch_fs *c = trans->c;
struct write_point *wp;
struct open_bucket *ob;
struct open_buckets ptrs;
unsigned nr_effective, write_points_nr;
unsigned ob_flags = 0;
bool have_cache;
- enum bucket_alloc_ret ret;
+ int ret;
int i;
if (!(flags & BCH_WRITE_ONLY_SPECIFIED_DEVS))
write_points_nr = c->write_points_nr;
have_cache = false;
- wp = writepoint_find(c, write_point.v);
+ wp = writepoint_find(trans, write_point.v);
- if (wp->type == BCH_DATA_user)
+ if (wp->data_type == BCH_DATA_user)
ob_flags |= BUCKET_MAY_ALLOC_PARTIAL;
/* metadata may not allocate on cache devices: */
- if (wp->type != BCH_DATA_user)
+ if (wp->data_type != BCH_DATA_user)
have_cache = true;
if (!target || (flags & BCH_WRITE_ONLY_SPECIFIED_DEVS)) {
- ret = open_bucket_add_buckets(c, &ptrs, wp, devs_have,
+ ret = open_bucket_add_buckets(trans, &ptrs, wp, devs_have,
target, erasure_code,
nr_replicas, &nr_effective,
&have_cache, reserve,
ob_flags, cl);
} else {
- ret = open_bucket_add_buckets(c, &ptrs, wp, devs_have,
+ ret = open_bucket_add_buckets(trans, &ptrs, wp, devs_have,
target, erasure_code,
nr_replicas, &nr_effective,
&have_cache, reserve,
ob_flags, NULL);
- if (!ret)
+ if (!ret ||
+ bch2_err_matches(ret, BCH_ERR_transaction_restart))
goto alloc_done;
- ret = open_bucket_add_buckets(c, &ptrs, wp, devs_have,
+ ret = open_bucket_add_buckets(trans, &ptrs, wp, devs_have,
0, erasure_code,
nr_replicas, &nr_effective,
&have_cache, reserve,
if (erasure_code && !ec_open_bucket(c, &ptrs))
pr_debug("failed to get ec bucket: ret %u", ret);
- if (ret == INSUFFICIENT_DEVICES &&
+ if (ret == -BCH_ERR_insufficient_devices &&
nr_effective >= nr_replicas_required)
ret = 0;
BUG_ON(!wp->sectors_free || wp->sectors_free == UINT_MAX);
- verify_not_stale(c, &wp->ptrs);
-
return wp;
err:
open_bucket_for_each(c, &wp->ptrs, ob, i)
mutex_unlock(&wp->lock);
- if (ret == FREELIST_EMPTY &&
+ if (bch2_err_matches(ret, BCH_ERR_freelist_empty) &&
try_decrease_writepoints(c, write_points_nr))
goto retry;
- switch (ret) {
- case OPEN_BUCKETS_EMPTY:
- case FREELIST_EMPTY:
- return cl ? ERR_PTR(-EAGAIN) : ERR_PTR(-ENOSPC);
- case INSUFFICIENT_DEVICES:
+ if (bch2_err_matches(ret, BCH_ERR_open_buckets_empty) ||
+ bch2_err_matches(ret, BCH_ERR_freelist_empty))
+ return cl
+ ? ERR_PTR(-EAGAIN)
+ : ERR_PTR(-BCH_ERR_ENOSPC_bucket_alloc);
+
+ if (bch2_err_matches(ret, BCH_ERR_insufficient_devices))
return ERR_PTR(-EROFS);
- default:
- BUG();
- }
+
+ return ERR_PTR(ret);
+}
+
+struct write_point *bch2_alloc_sectors_start(struct bch_fs *c,
+ unsigned target,
+ unsigned erasure_code,
+ struct write_point_specifier write_point,
+ struct bch_devs_list *devs_have,
+ unsigned nr_replicas,
+ unsigned nr_replicas_required,
+ enum alloc_reserve reserve,
+ unsigned flags,
+ struct closure *cl)
+{
+ struct write_point *wp;
+
+ bch2_trans_do(c, NULL, NULL, 0,
+ PTR_ERR_OR_ZERO(wp = bch2_alloc_sectors_start_trans(&trans, target,
+ erasure_code,
+ write_point,
+ devs_have,
+ nr_replicas,
+ nr_replicas_required,
+ reserve,
+ flags, cl)));
+ return wp;
+
+}
+
+struct bch_extent_ptr bch2_ob_ptr(struct bch_fs *c, struct open_bucket *ob)
+{
+ struct bch_dev *ca = bch_dev_bkey_exists(c, ob->dev);
+
+ return (struct bch_extent_ptr) {
+ .type = 1 << BCH_EXTENT_ENTRY_ptr,
+ .gen = ob->gen,
+ .dev = ob->dev,
+ .offset = bucket_to_sector(ca, ob->bucket) +
+ ca->mi.bucket_size -
+ ob->sectors_free,
+ };
}
/*
* as allocated out of @ob
*/
void bch2_alloc_sectors_append_ptrs(struct bch_fs *c, struct write_point *wp,
- struct bkey_i *k, unsigned sectors)
+ struct bkey_i *k, unsigned sectors,
+ bool cached)
{
struct open_bucket *ob;
wp->sectors_free -= sectors;
open_bucket_for_each(c, &wp->ptrs, ob, i) {
- struct bch_dev *ca = bch_dev_bkey_exists(c, ob->ptr.dev);
- struct bch_extent_ptr tmp = ob->ptr;
+ struct bch_dev *ca = bch_dev_bkey_exists(c, ob->dev);
+ struct bch_extent_ptr ptr = bch2_ob_ptr(c, ob);
- tmp.cached = !ca->mi.durability &&
- wp->type == BCH_DATA_user;
+ ptr.cached = cached ||
+ (!ca->mi.durability &&
+ wp->data_type == BCH_DATA_user);
- tmp.offset += ca->mi.bucket_size - ob->sectors_free;
- bch2_bkey_append_ptr(k, tmp);
+ bch2_bkey_append_ptr(k, ptr);
BUG_ON(sectors > ob->sectors_free);
ob->sectors_free -= sectors;
enum bch_data_type type)
{
mutex_init(&wp->lock);
- wp->type = type;
+ wp->data_type = type;
}
void bch2_fs_allocator_foreground_init(struct bch_fs *c)
wp < c->write_points + c->write_points_nr; wp++) {
writepoint_init(wp, BCH_DATA_user);
- wp->last_used = sched_clock();
+ wp->last_used = local_clock();
wp->write_point = (unsigned long) wp;
hlist_add_head_rcu(&wp->node,
writepoint_hash(c, wp->write_point));
}
}
+
+void bch2_open_buckets_to_text(struct printbuf *out, struct bch_fs *c)
+{
+ struct open_bucket *ob;
+
+ for (ob = c->open_buckets;
+ ob < c->open_buckets + ARRAY_SIZE(c->open_buckets);
+ ob++) {
+ spin_lock(&ob->lock);
+ if (ob->valid && !ob->on_partial_list) {
+ prt_printf(out, "%zu ref %u type %s %u:%llu:%u\n",
+ ob - c->open_buckets,
+ atomic_read(&ob->pin),
+ bch2_data_types[ob->data_type],
+ ob->dev, ob->bucket, ob->gen);
+ }
+ spin_unlock(&ob->lock);
+ }
+}
projects / bcachefs-tools-debian / blobdiff