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|
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright 2012 Google, Inc.
*
* 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.
*/
#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 "trace.h"
#include <linux/math64.h>
#include <linux/rculist.h>
#include <linux/rcupdate.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:
*
* - They track buckets that have been partially allocated, allowing for
* sub-bucket sized allocations - they're used by the sector allocator below
*
* - They provide a reference to the buckets they own that mark and sweep GC
* can find, until the new allocation has a pointer to it inserted into the
* btree
*
* When allocating some space with the sector allocator, the allocation comes
* with a reference to an open bucket - the caller is required to put that
* reference _after_ doing the index update that makes its allocation reachable.
*/
void bch2_reset_alloc_cursors(struct bch_fs *c)
{
struct bch_dev *ca;
unsigned i;
rcu_read_lock();
for_each_member_device_rcu(ca, c, i, NULL)
ca->alloc_cursor = 0;
rcu_read_unlock();
}
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->dev);
if (ob->ec) {
bch2_ec_bucket_written(c, ob);
return;
}
percpu_down_read(&c->mark_lock);
spin_lock(&ob->lock);
ob->valid = false;
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);
}
void bch2_open_bucket_write_error(struct bch_fs *c,
struct open_buckets *obs,
unsigned dev)
{
struct open_bucket *ob;
unsigned i;
open_bucket_for_each(c, obs, ob, i)
if (ob->dev == dev && ob->ec)
bch2_ec_bucket_cancel(c, ob);
}
static struct open_bucket *bch2_open_bucket_alloc(struct bch_fs *c)
{
struct open_bucket *ob;
BUG_ON(!c->open_buckets_freelist || !c->open_buckets_nr_free);
ob = c->open_buckets + c->open_buckets_freelist;
c->open_buckets_freelist = ob->freelist;
atomic_set(&ob->pin, 1);
ob->data_type = 0;
c->open_buckets_nr_free--;
return ob;
}
static void open_bucket_free_unused(struct bch_fs *c,
struct write_point *wp,
struct open_bucket *ob)
{
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));
if (ca->open_buckets_partial_nr <
ARRAY_SIZE(ca->open_buckets_partial) &&
may_realloc) {
spin_lock(&c->freelist_lock);
ob->on_partial_list = true;
ca->open_buckets_partial[ca->open_buckets_partial_nr++] =
ob - c->open_buckets;
spin_unlock(&c->freelist_lock);
closure_wake_up(&c->open_buckets_wait);
closure_wake_up(&c->freelist_wait);
} else {
bch2_open_bucket_put(c, ob);
}
}
/* _only_ for allocating the journal on a new device: */
long bch2_bucket_alloc_new_fs(struct bch_dev *ca)
{
while (ca->new_fs_bucket_idx < ca->mi.nbuckets) {
u64 b = ca->new_fs_bucket_idx++;
if (!is_superblock_bucket(ca, b) &&
(!ca->buckets_nouse || !test_bit(b, ca->buckets_nouse)))
return b;
}
return -1;
}
static inline unsigned open_buckets_reserved(enum alloc_reserve reserve)
{
switch (reserve) {
case RESERVE_btree:
case RESERVE_btree_movinggc:
return 0;
case RESERVE_movinggc:
return OPEN_BUCKETS_COUNT / 4;
default:
return OPEN_BUCKETS_COUNT / 2;
}
}
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,
struct bucket_alloc_state *s,
struct closure *cl)
{
struct open_bucket *ob;
if (unlikely(ca->buckets_nouse && test_bit(bucket, ca->buckets_nouse))) {
s->skipped_nouse++;
return NULL;
}
if (bch2_bucket_is_open(c, ca->dev_idx, bucket)) {
s->skipped_open++;
return NULL;
}
if (bch2_bucket_needs_journal_commit(&c->buckets_waiting_for_journal,
c->journal.flushed_seq_ondisk, ca->dev_idx, bucket)) {
s->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);
if (!c->blocked_allocate_open_bucket)
c->blocked_allocate_open_bucket = local_clock();
spin_unlock(&c->freelist_lock);
return ERR_PTR(-BCH_ERR_open_buckets_empty);
}
/* Recheck under lock: */
if (bch2_bucket_is_open(c, ca->dev_idx, bucket)) {
spin_unlock(&c->freelist_lock);
s->skipped_open++;
return NULL;
}
ob = bch2_open_bucket_alloc(c);
spin_lock(&ob->lock);
ob->valid = true;
ob->sectors_free = ca->mi.bucket_size;
ob->alloc_reserve = reserve;
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],
c->blocked_allocate_open_bucket);
c->blocked_allocate_open_bucket = 0;
}
if (c->blocked_allocate) {
bch2_time_stats_update(
&c->times[BCH_TIME_blocked_allocate],
c->blocked_allocate);
c->blocked_allocate = 0;
}
spin_unlock(&c->freelist_lock);
return ob;
}
static struct open_bucket *try_alloc_bucket(struct btree_trans *trans, struct bch_dev *ca,
enum alloc_reserve reserve, u64 free_entry,
struct bucket_alloc_state *s,
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, s, 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,
struct bucket_alloc_state *s,
struct closure *cl)
{
struct btree_iter iter;
struct bkey_s_c k;
struct open_bucket *ob = NULL;
u64 alloc_start = max_t(u64, ca->mi.first_bucket, ca->new_fs_bucket_idx);
u64 alloc_cursor = max(alloc_start, READ_ONCE(ca->alloc_cursor));
int ret;
again:
for_each_btree_key_norestart(trans, iter, BTREE_ID_alloc, POS(ca->dev_idx, alloc_cursor),
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;
s->buckets_seen++;
ob = __try_alloc_bucket(trans->c, ca, k.k->p.offset, reserve, &a, s, cl);
if (ob)
break;
}
bch2_trans_iter_exit(trans, &iter);
ca->alloc_cursor = alloc_cursor;
if (!ob && alloc_cursor > alloc_start) {
alloc_cursor = alloc_start;
goto again;
}
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,
struct bucket_alloc_state *s,
struct closure *cl)
{
struct btree_iter iter;
struct bkey_s_c k;
struct open_bucket *ob = NULL;
u64 alloc_start = max_t(u64, ca->mi.first_bucket, READ_ONCE(ca->alloc_cursor));
u64 alloc_cursor = alloc_start;
int ret;
BUG_ON(ca->new_fs_bucket_idx);
again:
for_each_btree_key_norestart(trans, iter, BTREE_ID_freespace,
POS(ca->dev_idx, alloc_cursor), 0, k, ret) {
if (k.k->p.inode != ca->dev_idx)
break;
for (alloc_cursor = max(alloc_cursor, bkey_start_offset(k.k));
alloc_cursor < k.k->p.offset;
alloc_cursor++) {
ret = btree_trans_too_many_iters(trans);
if (ret) {
ob = ERR_PTR(ret);
break;
}
s->buckets_seen++;
ob = try_alloc_bucket(trans, ca, reserve,
alloc_cursor, s, k, cl);
if (ob) {
iter.path->preserve = false;
break;
}
}
if (ob || ret)
break;
}
bch2_trans_iter_exit(trans, &iter);
ca->alloc_cursor = alloc_cursor;
if (!ob && ret)
ob = ERR_PTR(ret);
if (!ob && alloc_start > ca->mi.first_bucket) {
alloc_cursor = alloc_start = ca->mi.first_bucket;
goto again;
}
return ob;
}
/**
* 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;
u64 avail;
struct bucket_alloc_state s = { 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, &s, cl)
: bch2_bucket_alloc_early(trans, ca, reserve, &s, cl);
if (s.skipped_need_journal_commit * 2 > avail)
bch2_journal_flush_async(&c->journal, NULL);
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,
usage->d[BCH_DATA_free].buckets,
avail,
bch2_copygc_wait_amount(c),
c->copygc_wait - atomic64_read(&c->io_clock[WRITE].now),
&s,
cl == NULL,
"");
else if (!bch2_err_matches(PTR_ERR(ob), BCH_ERR_transaction_restart))
trace_and_count(c, bucket_alloc_fail, ca,
bch2_alloc_reserves[reserve],
may_alloc_partial,
0,
usage->d[BCH_DATA_free].buckets,
avail,
bch2_copygc_wait_amount(c),
c->copygc_wait - atomic64_read(&c->io_clock[WRITE].now),
&s,
cl == NULL,
bch2_err_str(PTR_ERR(ob)));
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;
}
static int __dev_stripe_cmp(struct dev_stripe_state *stripe,
unsigned l, unsigned r)
{
return ((stripe->next_alloc[l] > stripe->next_alloc[r]) -
(stripe->next_alloc[l] < stripe->next_alloc[r]));
}
#define dev_stripe_cmp(l, r) __dev_stripe_cmp(stripe, l, r)
struct dev_alloc_list bch2_dev_alloc_list(struct bch_fs *c,
struct dev_stripe_state *stripe,
struct bch_devs_mask *devs)
{
struct dev_alloc_list ret = { .nr = 0 };
unsigned i;
for_each_set_bit(i, devs->d, BCH_SB_MEMBERS_MAX)
ret.devs[ret.nr++] = i;
bubble_sort(ret.devs, ret.nr, dev_stripe_cmp);
return ret;
}
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_available(ca, RESERVE_none);
u64 free_space_inv = free_space
? div64_u64(1ULL << 48, free_space)
: 1ULL << 48;
u64 scale = *v / 4;
if (*v + free_space_inv >= *v)
*v += free_space_inv;
else
*v = U64_MAX;
for (v = stripe->next_alloc;
v < stripe->next_alloc + ARRAY_SIZE(stripe->next_alloc); v++)
*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)
static void add_new_bucket(struct bch_fs *c,
struct open_buckets *ptrs,
struct bch_devs_mask *devs_may_alloc,
unsigned *nr_effective,
bool *have_cache,
unsigned flags,
struct open_bucket *ob)
{
unsigned durability =
bch_dev_bkey_exists(c, ob->dev)->mi.durability;
__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);
}
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 nr_replicas,
unsigned *nr_effective,
bool *have_cache,
enum alloc_reserve reserve,
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;
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;
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) {
percpu_ref_put(&ca->ref);
continue;
}
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 (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);
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: */
/*
* if we can't allocate a new stripe because there are already too many
* partially filled stripes, force allocating from an existing stripe even when
* it's to a device we don't want:
*/
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,
u16 target,
unsigned erasure_code,
unsigned nr_replicas,
unsigned *nr_effective,
bool *have_cache,
unsigned flags,
struct closure *cl)
{
struct dev_alloc_list devs_sorted;
struct ec_stripe_head *h;
struct open_bucket *ob;
struct bch_dev *ca;
unsigned i, ec_idx;
if (!erasure_code)
return 0;
if (nr_replicas < 2)
return 0;
if (ec_open_bucket(c, ptrs))
return 0;
h = bch2_ec_stripe_head_get(c, target, 0, nr_replicas - 1,
wp == &c->copygc_write_point,
cl);
if (IS_ERR(h))
return -PTR_ERR(h);
if (!h)
return 0;
devs_sorted = bch2_dev_alloc_list(c, &wp->stripe, devs_may_alloc);
for (i = 0; i < devs_sorted.nr; i++)
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->dev);
ob->ec_idx = ec_idx;
ob->ec = h->s;
add_new_bucket(c, ptrs, devs_may_alloc,
nr_effective, have_cache, flags, ob);
atomic_inc(&h->s->pin);
out_put_head:
bch2_ec_stripe_head_put(c, h);
return 0;
}
/* Sector allocator */
static void get_buckets_from_writepoint(struct bch_fs *c,
struct open_buckets *ptrs,
struct write_point *wp,
struct bch_devs_mask *devs_may_alloc,
unsigned nr_replicas,
unsigned *nr_effective,
bool *have_cache,
unsigned flags,
bool need_ec)
{
struct open_buckets ptrs_skip = { .nr = 0 };
struct open_bucket *ob;
unsigned i;
open_bucket_for_each(c, &wp->ptrs, ob, i) {
struct bch_dev *ca = bch_dev_bkey_exists(c, ob->dev);
if (*nr_effective < nr_replicas &&
test_bit(ob->dev, devs_may_alloc->d) &&
(ca->mi.durability ||
(wp->data_type == BCH_DATA_user && !*have_cache)) &&
(ob->ec || !need_ec)) {
add_new_bucket(c, ptrs, devs_may_alloc,
nr_effective, have_cache,
flags, ob);
} else {
ob_push(c, &ptrs_skip, ob);
}
}
wp->ptrs = ptrs_skip;
}
static int open_bucket_add_buckets(struct btree_trans *trans,
struct open_buckets *ptrs,
struct write_point *wp,
struct bch_devs_list *devs_have,
u16 target,
unsigned erasure_code,
unsigned nr_replicas,
unsigned *nr_effective,
bool *have_cache,
enum alloc_reserve reserve,
unsigned flags,
struct closure *_cl)
{
struct bch_fs *c = trans->c;
struct bch_devs_mask devs;
struct open_bucket *ob;
struct closure *cl = NULL;
int ret;
unsigned i;
rcu_read_lock();
devs = target_rw_devs(c, wp->data_type, target);
rcu_read_unlock();
/* Don't allocate from devices we already have pointers to: */
for (i = 0; i < devs_have->nr; i++)
__clear_bit(devs_have->devs[i], devs.d);
open_bucket_for_each(c, ptrs, ob, i)
__clear_bit(ob->dev, devs.d);
if (erasure_code) {
if (!ec_open_bucket(c, ptrs)) {
get_buckets_from_writepoint(c, ptrs, wp, &devs,
nr_replicas, nr_effective,
have_cache, flags, true);
if (*nr_effective >= nr_replicas)
return 0;
}
if (!ec_open_bucket(c, ptrs)) {
ret = bucket_alloc_from_stripe(c, ptrs, wp, &devs,
target, erasure_code,
nr_replicas, nr_effective,
have_cache, flags, _cl);
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;
}
}
get_buckets_from_writepoint(c, ptrs, wp, &devs,
nr_replicas, nr_effective,
have_cache, flags, false);
if (*nr_effective >= nr_replicas)
return 0;
retry_blocking:
/*
* Try nonblocking first, so that if one device is full we'll try from
* other devices:
*/
ret = bch2_bucket_alloc_set_trans(trans, ptrs, &wp->stripe, &devs,
nr_replicas, nr_effective, have_cache,
reserve, flags, 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;
}
return ret;
}
void bch2_open_buckets_stop_dev(struct bch_fs *c, struct bch_dev *ca,
struct open_buckets *obs)
{
struct open_buckets ptrs = { .nr = 0 };
struct open_bucket *ob, *ob2;
unsigned i, j;
open_bucket_for_each(c, obs, ob, i) {
bool drop = !ca || ob->dev == ca->dev_idx;
if (!drop && ob->ec) {
mutex_lock(&ob->ec->lock);
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);
}
if (drop)
bch2_open_bucket_put(c, ob);
else
ob_push(c, &ptrs, ob);
}
*obs = ptrs;
}
void bch2_writepoint_stop(struct bch_fs *c, struct bch_dev *ca,
struct write_point *wp)
{
mutex_lock(&wp->lock);
bch2_open_buckets_stop_dev(c, ca, &wp->ptrs);
mutex_unlock(&wp->lock);
}
static inline struct hlist_head *writepoint_hash(struct bch_fs *c,
unsigned long write_point)
{
unsigned hash =
hash_long(write_point, ilog2(ARRAY_SIZE(c->write_points_hash)));
return &c->write_points_hash[hash];
}
static struct write_point *__writepoint_find(struct hlist_head *head,
unsigned long write_point)
{
struct write_point *wp;
rcu_read_lock();
hlist_for_each_entry_rcu(wp, head, node)
if (wp->write_point == write_point)
goto out;
wp = NULL;
out:
rcu_read_unlock();
return wp;
}
static inline bool too_many_writepoints(struct bch_fs *c, unsigned factor)
{
u64 stranded = c->write_points_nr * c->bucket_size_max;
u64 free = bch2_fs_usage_read_short(c).free;
return stranded * factor > free;
}
static bool try_increase_writepoints(struct bch_fs *c)
{
struct write_point *wp;
if (c->write_points_nr == ARRAY_SIZE(c->write_points) ||
too_many_writepoints(c, 32))
return false;
wp = c->write_points + c->write_points_nr++;
hlist_add_head_rcu(&wp->node, writepoint_hash(c, wp->write_point));
return true;
}
static bool try_decrease_writepoints(struct bch_fs *c,
unsigned old_nr)
{
struct write_point *wp;
mutex_lock(&c->write_points_hash_lock);
if (c->write_points_nr < old_nr) {
mutex_unlock(&c->write_points_hash_lock);
return true;
}
if (c->write_points_nr == 1 ||
!too_many_writepoints(c, 8)) {
mutex_unlock(&c->write_points_hash_lock);
return false;
}
wp = c->write_points + --c->write_points_nr;
hlist_del_rcu(&wp->node);
mutex_unlock(&c->write_points_hash_lock);
bch2_writepoint_stop(c, NULL, wp);
return true;
}
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;
bch2_trans_mutex_lock(trans, &wp->lock);
return wp;
}
head = writepoint_hash(c, write_point);
restart_find:
wp = __writepoint_find(head, write_point);
if (wp) {
lock_wp:
bch2_trans_mutex_lock(trans, &wp->lock);
if (wp->write_point == write_point)
goto out;
mutex_unlock(&wp->lock);
goto restart_find;
}
restart_find_oldest:
oldest = NULL;
for (wp = c->write_points;
wp < c->write_points + c->write_points_nr; wp++)
if (!oldest || time_before64(wp->last_used, oldest->last_used))
oldest = wp;
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);
mutex_unlock(&oldest->lock);
goto restart_find_oldest;
}
wp = __writepoint_find(head, write_point);
if (wp && wp != oldest) {
mutex_unlock(&c->write_points_hash_lock);
mutex_unlock(&oldest->lock);
goto lock_wp;
}
wp = oldest;
hlist_del_rcu(&wp->node);
wp->write_point = write_point;
hlist_add_head_rcu(&wp->node, head);
mutex_unlock(&c->write_points_hash_lock);
out:
wp->last_used = local_clock();
return wp;
}
/*
* Get us an open_bucket we can allocate from, return with it locked:
*/
int bch2_alloc_sectors_start_trans(struct btree_trans *trans,
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_ret)
{
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;
int ret;
int i;
if (!(flags & BCH_WRITE_ONLY_SPECIFIED_DEVS))
ob_flags |= BUCKET_ALLOC_USE_DURABILITY;
BUG_ON(!nr_replicas || !nr_replicas_required);
retry:
ptrs.nr = 0;
nr_effective = 0;
write_points_nr = c->write_points_nr;
have_cache = false;
*wp_ret = wp = writepoint_find(trans, write_point.v);
if (wp->data_type == BCH_DATA_user)
ob_flags |= BUCKET_MAY_ALLOC_PARTIAL;
/* metadata may not allocate on cache devices: */
if (wp->data_type != BCH_DATA_user)
have_cache = true;
if (!target || (flags & BCH_WRITE_ONLY_SPECIFIED_DEVS)) {
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(trans, &ptrs, wp, devs_have,
target, erasure_code,
nr_replicas, &nr_effective,
&have_cache, reserve,
ob_flags, NULL);
if (!ret ||
bch2_err_matches(ret, BCH_ERR_transaction_restart))
goto alloc_done;
ret = open_bucket_add_buckets(trans, &ptrs, wp, devs_have,
0, erasure_code,
nr_replicas, &nr_effective,
&have_cache, reserve,
ob_flags, cl);
}
alloc_done:
BUG_ON(!ret && nr_effective < nr_replicas);
if (erasure_code && !ec_open_bucket(c, &ptrs))
pr_debug("failed to get ec bucket: ret %u", ret);
if (ret == -BCH_ERR_insufficient_devices &&
nr_effective >= nr_replicas_required)
ret = 0;
if (ret)
goto err;
/* Free buckets we didn't use: */
open_bucket_for_each(c, &wp->ptrs, ob, i)
open_bucket_free_unused(c, wp, ob);
wp->ptrs = ptrs;
wp->sectors_free = UINT_MAX;
open_bucket_for_each(c, &wp->ptrs, ob, i)
wp->sectors_free = min(wp->sectors_free, ob->sectors_free);
BUG_ON(!wp->sectors_free || wp->sectors_free == UINT_MAX);
return 0;
err:
open_bucket_for_each(c, &wp->ptrs, ob, i)
if (ptrs.nr < ARRAY_SIZE(ptrs.v))
ob_push(c, &ptrs, ob);
else
open_bucket_free_unused(c, wp, ob);
wp->ptrs = ptrs;
mutex_unlock(&wp->lock);
if (bch2_err_matches(ret, BCH_ERR_freelist_empty) &&
try_decrease_writepoints(c, write_points_nr))
goto retry;
if (bch2_err_matches(ret, BCH_ERR_open_buckets_empty) ||
bch2_err_matches(ret, BCH_ERR_freelist_empty))
return cl
? -EAGAIN
: -BCH_ERR_ENOSPC_bucket_alloc;
if (bch2_err_matches(ret, BCH_ERR_insufficient_devices))
return -EROFS;
return ret;
}
int 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_ret)
{
return bch2_trans_do(c, NULL, NULL, 0,
bch2_alloc_sectors_start_trans(&trans, target,
erasure_code,
write_point,
devs_have,
nr_replicas,
nr_replicas_required,
reserve,
flags, cl, wp_ret));
}
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,
};
}
/*
* Append pointers to the space we just allocated to @k, and mark @sectors space
* 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,
bool cached)
{
struct open_bucket *ob;
unsigned i;
BUG_ON(sectors > wp->sectors_free);
wp->sectors_free -= sectors;
wp->sectors_allocated += sectors;
open_bucket_for_each(c, &wp->ptrs, ob, i) {
struct bch_dev *ca = bch_dev_bkey_exists(c, ob->dev);
struct bch_extent_ptr ptr = bch2_ob_ptr(c, ob);
ptr.cached = cached ||
(!ca->mi.durability &&
wp->data_type == BCH_DATA_user);
bch2_bkey_append_ptr(k, ptr);
BUG_ON(sectors > ob->sectors_free);
ob->sectors_free -= sectors;
}
}
/*
* Append pointers to the space we just allocated to @k, and mark @sectors space
* as allocated out of @ob
*/
void bch2_alloc_sectors_done(struct bch_fs *c, struct write_point *wp)
{
struct open_buckets ptrs = { .nr = 0 }, keep = { .nr = 0 };
struct open_bucket *ob;
unsigned i;
open_bucket_for_each(c, &wp->ptrs, ob, i)
ob_push(c, !ob->sectors_free ? &ptrs : &keep, ob);
wp->ptrs = keep;
mutex_unlock(&wp->lock);
bch2_open_buckets_put(c, &ptrs);
}
static inline void writepoint_init(struct write_point *wp,
enum bch_data_type type)
{
mutex_init(&wp->lock);
wp->data_type = type;
INIT_WORK(&wp->index_update_work, bch2_write_point_do_index_updates);
INIT_LIST_HEAD(&wp->writes);
spin_lock_init(&wp->writes_lock);
}
void bch2_fs_allocator_foreground_init(struct bch_fs *c)
{
struct open_bucket *ob;
struct write_point *wp;
mutex_init(&c->write_points_hash_lock);
c->write_points_nr = ARRAY_SIZE(c->write_points);
/* open bucket 0 is a sentinal NULL: */
spin_lock_init(&c->open_buckets[0].lock);
for (ob = c->open_buckets + 1;
ob < c->open_buckets + ARRAY_SIZE(c->open_buckets); ob++) {
spin_lock_init(&ob->lock);
c->open_buckets_nr_free++;
ob->freelist = c->open_buckets_freelist;
c->open_buckets_freelist = ob - c->open_buckets;
}
writepoint_init(&c->btree_write_point, BCH_DATA_btree);
writepoint_init(&c->rebalance_write_point, BCH_DATA_user);
writepoint_init(&c->copygc_write_point, BCH_DATA_user);
for (wp = c->write_points;
wp < c->write_points + c->write_points_nr; wp++) {
writepoint_init(wp, BCH_DATA_user);
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);
}
}
static const char * const bch2_write_point_states[] = {
#define x(n) #n,
WRITE_POINT_STATES()
#undef x
NULL
};
void bch2_write_points_to_text(struct printbuf *out, struct bch_fs *c)
{
struct write_point *wp;
unsigned i;
for (wp = c->write_points;
wp < c->write_points + ARRAY_SIZE(c->write_points);
wp++) {
prt_printf(out, "%lu: ", wp->write_point);
prt_human_readable_u64(out, wp->sectors_allocated);
prt_printf(out, " last wrote: ");
bch2_pr_time_units(out, sched_clock() - wp->last_used);
for (i = 0; i < WRITE_POINT_STATE_NR; i++) {
prt_printf(out, " %s: ", bch2_write_point_states[i]);
bch2_pr_time_units(out, wp->time[i]);
}
prt_newline(out);
}
}
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