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linux/fs/bcachefs/btree_update_interior.c
Kent Overstreet 7a51608d01 bcachefs: Rework btree node pinning 
In backpointers fsck, we do a seqential scan of one btree, and check
references to another: extents <-> backpointers

Checking references generates random lookups, so we want to pin that
btree in memory (or only a range, if it doesn't fit in ram).

Previously, this was done with a simple check in the shrinker - "if
btree node is in range being pinned, don't free it" - but this generated
OOMs, as our shrinker wasn't well behaved if there was less memory
available than expected.

Instead, we now have two different shrinkers and lru lists; the second
shrinker being for pinned nodes, with seeks set much higher than normal
- so they can still be freed if necessary, but we'll prefer not to.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
2024-09-21 11:39:48 -04:00

2712 lines
74 KiB
C
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// SPDX-License-Identifier: GPL-2.0
#include "bcachefs.h"
#include "alloc_foreground.h"
#include "bkey_buf.h"
#include "bkey_methods.h"
#include "btree_cache.h"
#include "btree_gc.h"
#include "btree_journal_iter.h"
#include "btree_update.h"
#include "btree_update_interior.h"
#include "btree_io.h"
#include "btree_iter.h"
#include "btree_locking.h"
#include "buckets.h"
#include "clock.h"
#include "error.h"
#include "extents.h"
#include "io_write.h"
#include "journal.h"
#include "journal_reclaim.h"
#include "keylist.h"
#include "recovery_passes.h"
#include "replicas.h"
#include "sb-members.h"
#include "super-io.h"
#include "trace.h"
#include <linux/random.h>
static const char * const bch2_btree_update_modes[] = {
#define x(t) #t,
BTREE_UPDATE_MODES()
#undef x
NULL
};
static int bch2_btree_insert_node(struct btree_update *, struct btree_trans *,
btree_path_idx_t, struct btree *, struct keylist *);
static void bch2_btree_update_add_new_node(struct btree_update *, struct btree *);
/*
* Verify that child nodes correctly span parent node's range:
*/
int bch2_btree_node_check_topology(struct btree_trans *trans, struct btree *b)
{
struct bch_fs *c = trans->c;
struct bpos node_min = b->key.k.type == KEY_TYPE_btree_ptr_v2
? bkey_i_to_btree_ptr_v2(&b->key)->v.min_key
: b->data->min_key;
struct btree_and_journal_iter iter;
struct bkey_s_c k;
struct printbuf buf = PRINTBUF;
struct bkey_buf prev;
int ret = 0;
BUG_ON(b->key.k.type == KEY_TYPE_btree_ptr_v2 &&
!bpos_eq(bkey_i_to_btree_ptr_v2(&b->key)->v.min_key,
b->data->min_key));
if (b == btree_node_root(c, b)) {
if (!bpos_eq(b->data->min_key, POS_MIN)) {
printbuf_reset(&buf);
bch2_bpos_to_text(&buf, b->data->min_key);
need_fsck_err(trans, btree_root_bad_min_key,
"btree root with incorrect min_key: %s", buf.buf);
goto topology_repair;
}
if (!bpos_eq(b->data->max_key, SPOS_MAX)) {
printbuf_reset(&buf);
bch2_bpos_to_text(&buf, b->data->max_key);
need_fsck_err(trans, btree_root_bad_max_key,
"btree root with incorrect max_key: %s", buf.buf);
goto topology_repair;
}
}
if (!b->c.level)
return 0;
bch2_bkey_buf_init(&prev);
bkey_init(&prev.k->k);
bch2_btree_and_journal_iter_init_node_iter(trans, &iter, b);
while ((k = bch2_btree_and_journal_iter_peek(&iter)).k) {
if (k.k->type != KEY_TYPE_btree_ptr_v2)
goto out;
struct bkey_s_c_btree_ptr_v2 bp = bkey_s_c_to_btree_ptr_v2(k);
struct bpos expected_min = bkey_deleted(&prev.k->k)
? node_min
: bpos_successor(prev.k->k.p);
if (!bpos_eq(expected_min, bp.v->min_key)) {
bch2_topology_error(c);
printbuf_reset(&buf);
prt_str(&buf, "end of prev node doesn't match start of next node\n"),
prt_printf(&buf, " in btree %s level %u node ",
bch2_btree_id_str(b->c.btree_id), b->c.level);
bch2_bkey_val_to_text(&buf, c, bkey_i_to_s_c(&b->key));
prt_str(&buf, "\n prev ");
bch2_bkey_val_to_text(&buf, c, bkey_i_to_s_c(prev.k));
prt_str(&buf, "\n next ");
bch2_bkey_val_to_text(&buf, c, k);
need_fsck_err(trans, btree_node_topology_bad_min_key, "%s", buf.buf);
goto topology_repair;
}
bch2_bkey_buf_reassemble(&prev, c, k);
bch2_btree_and_journal_iter_advance(&iter);
}
if (bkey_deleted(&prev.k->k)) {
bch2_topology_error(c);
printbuf_reset(&buf);
prt_str(&buf, "empty interior node\n");
prt_printf(&buf, " in btree %s level %u node ",
bch2_btree_id_str(b->c.btree_id), b->c.level);
bch2_bkey_val_to_text(&buf, c, bkey_i_to_s_c(&b->key));
need_fsck_err(trans, btree_node_topology_empty_interior_node, "%s", buf.buf);
goto topology_repair;
} else if (!bpos_eq(prev.k->k.p, b->key.k.p)) {
bch2_topology_error(c);
printbuf_reset(&buf);
prt_str(&buf, "last child node doesn't end at end of parent node\n");
prt_printf(&buf, " in btree %s level %u node ",
bch2_btree_id_str(b->c.btree_id), b->c.level);
bch2_bkey_val_to_text(&buf, c, bkey_i_to_s_c(&b->key));
prt_str(&buf, "\n last key ");
bch2_bkey_val_to_text(&buf, c, bkey_i_to_s_c(prev.k));
need_fsck_err(trans, btree_node_topology_bad_max_key, "%s", buf.buf);
goto topology_repair;
}
out:
fsck_err:
bch2_btree_and_journal_iter_exit(&iter);
bch2_bkey_buf_exit(&prev, c);
printbuf_exit(&buf);
return ret;
topology_repair:
if ((c->opts.recovery_passes & BIT_ULL(BCH_RECOVERY_PASS_check_topology)) &&
c->curr_recovery_pass > BCH_RECOVERY_PASS_check_topology) {
bch2_inconsistent_error(c);
ret = -BCH_ERR_btree_need_topology_repair;
} else {
ret = bch2_run_explicit_recovery_pass(c, BCH_RECOVERY_PASS_check_topology);
}
goto out;
}
/* Calculate ideal packed bkey format for new btree nodes: */
static void __bch2_btree_calc_format(struct bkey_format_state *s, struct btree *b)
{
struct bkey_packed *k;
struct bkey uk;
for_each_bset(b, t)
bset_tree_for_each_key(b, t, k)
if (!bkey_deleted(k)) {
uk = bkey_unpack_key(b, k);
bch2_bkey_format_add_key(s, &uk);
}
}
static struct bkey_format bch2_btree_calc_format(struct btree *b)
{
struct bkey_format_state s;
bch2_bkey_format_init(&s);
bch2_bkey_format_add_pos(&s, b->data->min_key);
bch2_bkey_format_add_pos(&s, b->data->max_key);
__bch2_btree_calc_format(&s, b);
return bch2_bkey_format_done(&s);
}
static size_t btree_node_u64s_with_format(struct btree_nr_keys nr,
struct bkey_format *old_f,
struct bkey_format *new_f)
{
/* stupid integer promotion rules */
ssize_t delta =
(((int) new_f->key_u64s - old_f->key_u64s) *
(int) nr.packed_keys) +
(((int) new_f->key_u64s - BKEY_U64s) *
(int) nr.unpacked_keys);
BUG_ON(delta + nr.live_u64s < 0);
return nr.live_u64s + delta;
}
/**
* bch2_btree_node_format_fits - check if we could rewrite node with a new format
*
* @c: filesystem handle
* @b: btree node to rewrite
* @nr: number of keys for new node (i.e. b->nr)
* @new_f: bkey format to translate keys to
*
* Returns: true if all re-packed keys will be able to fit in a new node.
*
* Assumes all keys will successfully pack with the new format.
*/
static bool bch2_btree_node_format_fits(struct bch_fs *c, struct btree *b,
struct btree_nr_keys nr,
struct bkey_format *new_f)
{
size_t u64s = btree_node_u64s_with_format(nr, &b->format, new_f);
return __vstruct_bytes(struct btree_node, u64s) < btree_buf_bytes(b);
}
/* Btree node freeing/allocation: */
static void __btree_node_free(struct btree_trans *trans, struct btree *b)
{
struct bch_fs *c = trans->c;
trace_and_count(c, btree_node_free, trans, b);
BUG_ON(btree_node_write_blocked(b));
BUG_ON(btree_node_dirty(b));
BUG_ON(btree_node_need_write(b));
BUG_ON(b == btree_node_root(c, b));
BUG_ON(b->ob.nr);
BUG_ON(!list_empty(&b->write_blocked));
BUG_ON(b->will_make_reachable);
clear_btree_node_noevict(b);
mutex_lock(&c->btree_cache.lock);
list_move(&b->list, &c->btree_cache.freeable);
mutex_unlock(&c->btree_cache.lock);
}
static void bch2_btree_node_free_inmem(struct btree_trans *trans,
struct btree_path *path,
struct btree *b)
{
struct bch_fs *c = trans->c;
unsigned i, level = b->c.level;
bch2_btree_node_lock_write_nofail(trans, path, &b->c);
mutex_lock(&c->btree_cache.lock);
bch2_btree_node_hash_remove(&c->btree_cache, b);
mutex_unlock(&c->btree_cache.lock);
__btree_node_free(trans, b);
six_unlock_write(&b->c.lock);
mark_btree_node_locked_noreset(path, level, BTREE_NODE_INTENT_LOCKED);
trans_for_each_path(trans, path, i)
if (path->l[level].b == b) {
btree_node_unlock(trans, path, level);
path->l[level].b = ERR_PTR(-BCH_ERR_no_btree_node_init);
}
}
static void bch2_btree_node_free_never_used(struct btree_update *as,
struct btree_trans *trans,
struct btree *b)
{
struct bch_fs *c = as->c;
struct prealloc_nodes *p = &as->prealloc_nodes[b->c.lock.readers != NULL];
struct btree_path *path;
unsigned i, level = b->c.level;
BUG_ON(!list_empty(&b->write_blocked));
BUG_ON(b->will_make_reachable != (1UL|(unsigned long) as));
b->will_make_reachable = 0;
closure_put(&as->cl);
clear_btree_node_will_make_reachable(b);
clear_btree_node_accessed(b);
clear_btree_node_dirty_acct(c, b);
clear_btree_node_need_write(b);
mutex_lock(&c->btree_cache.lock);
bch2_btree_node_hash_remove(&c->btree_cache, b);
mutex_unlock(&c->btree_cache.lock);
BUG_ON(p->nr >= ARRAY_SIZE(p->b));
p->b[p->nr++] = b;
six_unlock_intent(&b->c.lock);
trans_for_each_path(trans, path, i)
if (path->l[level].b == b) {
btree_node_unlock(trans, path, level);
path->l[level].b = ERR_PTR(-BCH_ERR_no_btree_node_init);
}
}
static struct btree *__bch2_btree_node_alloc(struct btree_trans *trans,
struct disk_reservation *res,
struct closure *cl,
bool interior_node,
unsigned flags)
{
struct bch_fs *c = trans->c;
struct write_point *wp;
struct btree *b;
BKEY_PADDED_ONSTACK(k, BKEY_BTREE_PTR_VAL_U64s_MAX) tmp;
struct open_buckets obs = { .nr = 0 };
struct bch_devs_list devs_have = (struct bch_devs_list) { 0 };
enum bch_watermark watermark = flags & BCH_WATERMARK_MASK;
unsigned nr_reserve = watermark < BCH_WATERMARK_reclaim
? BTREE_NODE_RESERVE
: 0;
int ret;
b = bch2_btree_node_mem_alloc(trans, interior_node);
if (IS_ERR(b))
return b;
BUG_ON(b->ob.nr);
mutex_lock(&c->btree_reserve_cache_lock);
if (c->btree_reserve_cache_nr > nr_reserve) {
struct btree_alloc *a =
&c->btree_reserve_cache[--c->btree_reserve_cache_nr];
obs = a->ob;
bkey_copy(&tmp.k, &a->k);
mutex_unlock(&c->btree_reserve_cache_lock);
goto out;
}
mutex_unlock(&c->btree_reserve_cache_lock);
retry:
ret = bch2_alloc_sectors_start_trans(trans,
c->opts.metadata_target ?:
c->opts.foreground_target,
0,
writepoint_ptr(&c->btree_write_point),
&devs_have,
res->nr_replicas,
min(res->nr_replicas,
c->opts.metadata_replicas_required),
watermark, 0, cl, &wp);
if (unlikely(ret))
goto err;
if (wp->sectors_free < btree_sectors(c)) {
struct open_bucket *ob;
unsigned i;
open_bucket_for_each(c, &wp->ptrs, ob, i)
if (ob->sectors_free < btree_sectors(c))
ob->sectors_free = 0;
bch2_alloc_sectors_done(c, wp);
goto retry;
}
bkey_btree_ptr_v2_init(&tmp.k);
bch2_alloc_sectors_append_ptrs(c, wp, &tmp.k, btree_sectors(c), false);
bch2_open_bucket_get(c, wp, &obs);
bch2_alloc_sectors_done(c, wp);
out:
bkey_copy(&b->key, &tmp.k);
b->ob = obs;
six_unlock_write(&b->c.lock);
six_unlock_intent(&b->c.lock);
return b;
err:
bch2_btree_node_to_freelist(c, b);
return ERR_PTR(ret);
}
static struct btree *bch2_btree_node_alloc(struct btree_update *as,
struct btree_trans *trans,
unsigned level)
{
struct bch_fs *c = as->c;
struct btree *b;
struct prealloc_nodes *p = &as->prealloc_nodes[!!level];
int ret;
BUG_ON(level >= BTREE_MAX_DEPTH);
BUG_ON(!p->nr);
b = p->b[--p->nr];
btree_node_lock_nopath_nofail(trans, &b->c, SIX_LOCK_intent);
btree_node_lock_nopath_nofail(trans, &b->c, SIX_LOCK_write);
set_btree_node_accessed(b);
set_btree_node_dirty_acct(c, b);
set_btree_node_need_write(b);
bch2_bset_init_first(b, &b->data->keys);
b->c.level = level;
b->c.btree_id = as->btree_id;
b->version_ondisk = c->sb.version;
memset(&b->nr, 0, sizeof(b->nr));
b->data->magic = cpu_to_le64(bset_magic(c));
memset(&b->data->_ptr, 0, sizeof(b->data->_ptr));
b->data->flags = 0;
SET_BTREE_NODE_ID(b->data, as->btree_id);
SET_BTREE_NODE_LEVEL(b->data, level);
if (b->key.k.type == KEY_TYPE_btree_ptr_v2) {
struct bkey_i_btree_ptr_v2 *bp = bkey_i_to_btree_ptr_v2(&b->key);
bp->v.mem_ptr = 0;
bp->v.seq = b->data->keys.seq;
bp->v.sectors_written = 0;
}
SET_BTREE_NODE_NEW_EXTENT_OVERWRITE(b->data, true);
bch2_btree_build_aux_trees(b);
ret = bch2_btree_node_hash_insert(&c->btree_cache, b, level, as->btree_id);
BUG_ON(ret);
trace_and_count(c, btree_node_alloc, trans, b);
bch2_increment_clock(c, btree_sectors(c), WRITE);
return b;
}
static void btree_set_min(struct btree *b, struct bpos pos)
{
if (b->key.k.type == KEY_TYPE_btree_ptr_v2)
bkey_i_to_btree_ptr_v2(&b->key)->v.min_key = pos;
b->data->min_key = pos;
}
static void btree_set_max(struct btree *b, struct bpos pos)
{
b->key.k.p = pos;
b->data->max_key = pos;
}
static struct btree *bch2_btree_node_alloc_replacement(struct btree_update *as,
struct btree_trans *trans,
struct btree *b)
{
struct btree *n = bch2_btree_node_alloc(as, trans, b->c.level);
struct bkey_format format = bch2_btree_calc_format(b);
/*
* The keys might expand with the new format - if they wouldn't fit in
* the btree node anymore, use the old format for now:
*/
if (!bch2_btree_node_format_fits(as->c, b, b->nr, &format))
format = b->format;
SET_BTREE_NODE_SEQ(n->data, BTREE_NODE_SEQ(b->data) + 1);
btree_set_min(n, b->data->min_key);
btree_set_max(n, b->data->max_key);
n->data->format = format;
btree_node_set_format(n, format);
bch2_btree_sort_into(as->c, n, b);
btree_node_reset_sib_u64s(n);
return n;
}
static struct btree *__btree_root_alloc(struct btree_update *as,
struct btree_trans *trans, unsigned level)
{
struct btree *b = bch2_btree_node_alloc(as, trans, level);
btree_set_min(b, POS_MIN);
btree_set_max(b, SPOS_MAX);
b->data->format = bch2_btree_calc_format(b);
btree_node_set_format(b, b->data->format);
bch2_btree_build_aux_trees(b);
return b;
}
static void bch2_btree_reserve_put(struct btree_update *as, struct btree_trans *trans)
{
struct bch_fs *c = as->c;
struct prealloc_nodes *p;
for (p = as->prealloc_nodes;
p < as->prealloc_nodes + ARRAY_SIZE(as->prealloc_nodes);
p++) {
while (p->nr) {
struct btree *b = p->b[--p->nr];
mutex_lock(&c->btree_reserve_cache_lock);
if (c->btree_reserve_cache_nr <
ARRAY_SIZE(c->btree_reserve_cache)) {
struct btree_alloc *a =
&c->btree_reserve_cache[c->btree_reserve_cache_nr++];
a->ob = b->ob;
b->ob.nr = 0;
bkey_copy(&a->k, &b->key);
} else {
bch2_open_buckets_put(c, &b->ob);
}
mutex_unlock(&c->btree_reserve_cache_lock);
btree_node_lock_nopath_nofail(trans, &b->c, SIX_LOCK_intent);
btree_node_lock_nopath_nofail(trans, &b->c, SIX_LOCK_write);
__btree_node_free(trans, b);
six_unlock_write(&b->c.lock);
six_unlock_intent(&b->c.lock);
}
}
}
static int bch2_btree_reserve_get(struct btree_trans *trans,
struct btree_update *as,
unsigned nr_nodes[2],
unsigned flags,
struct closure *cl)
{
struct btree *b;
unsigned interior;
int ret = 0;
BUG_ON(nr_nodes[0] + nr_nodes[1] > BTREE_RESERVE_MAX);
/*
* Protects reaping from the btree node cache and using the btree node
* open bucket reserve:
*/
ret = bch2_btree_cache_cannibalize_lock(trans, cl);
if (ret)
return ret;
for (interior = 0; interior < 2; interior++) {
struct prealloc_nodes *p = as->prealloc_nodes + interior;
while (p->nr < nr_nodes[interior]) {
b = __bch2_btree_node_alloc(trans, &as->disk_res, cl,
interior, flags);
if (IS_ERR(b)) {
ret = PTR_ERR(b);
goto err;
}
p->b[p->nr++] = b;
}
}
err:
bch2_btree_cache_cannibalize_unlock(trans);
return ret;
}
/* Asynchronous interior node update machinery */
static void bch2_btree_update_free(struct btree_update *as, struct btree_trans *trans)
{
struct bch_fs *c = as->c;
if (as->took_gc_lock)
up_read(&c->gc_lock);
as->took_gc_lock = false;
bch2_journal_pin_drop(&c->journal, &as->journal);
bch2_journal_pin_flush(&c->journal, &as->journal);
bch2_disk_reservation_put(c, &as->disk_res);
bch2_btree_reserve_put(as, trans);
bch2_time_stats_update(&c->times[BCH_TIME_btree_interior_update_total],
as->start_time);
mutex_lock(&c->btree_interior_update_lock);
list_del(&as->unwritten_list);
list_del(&as->list);
closure_debug_destroy(&as->cl);
mempool_free(as, &c->btree_interior_update_pool);
/*
* Have to do the wakeup with btree_interior_update_lock still held,
* since being on btree_interior_update_list is our ref on @c:
*/
closure_wake_up(&c->btree_interior_update_wait);
mutex_unlock(&c->btree_interior_update_lock);
}
static void btree_update_add_key(struct btree_update *as,
struct keylist *keys, struct btree *b)
{
struct bkey_i *k = &b->key;
BUG_ON(bch2_keylist_u64s(keys) + k->k.u64s >
ARRAY_SIZE(as->_old_keys));
bkey_copy(keys->top, k);
bkey_i_to_btree_ptr_v2(keys->top)->v.mem_ptr = b->c.level + 1;
bch2_keylist_push(keys);
}
static bool btree_update_new_nodes_marked_sb(struct btree_update *as)
{
for_each_keylist_key(&as->new_keys, k)
if (!bch2_dev_btree_bitmap_marked(as->c, bkey_i_to_s_c(k)))
return false;
return true;
}
static void btree_update_new_nodes_mark_sb(struct btree_update *as)
{
struct bch_fs *c = as->c;
mutex_lock(&c->sb_lock);
for_each_keylist_key(&as->new_keys, k)
bch2_dev_btree_bitmap_mark(c, bkey_i_to_s_c(k));
bch2_write_super(c);
mutex_unlock(&c->sb_lock);
}
/*
* The transactional part of an interior btree node update, where we journal the
* update we did to the interior node and update alloc info:
*/
static int btree_update_nodes_written_trans(struct btree_trans *trans,
struct btree_update *as)
{
struct jset_entry *e = bch2_trans_jset_entry_alloc(trans, as->journal_u64s);
int ret = PTR_ERR_OR_ZERO(e);
if (ret)
return ret;
memcpy(e, as->journal_entries, as->journal_u64s * sizeof(u64));
trans->journal_pin = &as->journal;
for_each_keylist_key(&as->old_keys, k) {
unsigned level = bkey_i_to_btree_ptr_v2(k)->v.mem_ptr;
ret = bch2_key_trigger_old(trans, as->btree_id, level, bkey_i_to_s_c(k),
BTREE_TRIGGER_transactional);
if (ret)
return ret;
}
for_each_keylist_key(&as->new_keys, k) {
unsigned level = bkey_i_to_btree_ptr_v2(k)->v.mem_ptr;
ret = bch2_key_trigger_new(trans, as->btree_id, level, bkey_i_to_s(k),
BTREE_TRIGGER_transactional);
if (ret)
return ret;
}
return 0;
}
static void btree_update_nodes_written(struct btree_update *as)
{
struct bch_fs *c = as->c;
struct btree *b;
struct btree_trans *trans = bch2_trans_get(c);
u64 journal_seq = 0;
unsigned i;
int ret;
/*
* If we're already in an error state, it might be because a btree node
* was never written, and we might be trying to free that same btree
* node here, but it won't have been marked as allocated and we'll see
* spurious disk usage inconsistencies in the transactional part below
* if we don't skip it:
*/
ret = bch2_journal_error(&c->journal);
if (ret)
goto err;
if (!btree_update_new_nodes_marked_sb(as))
btree_update_new_nodes_mark_sb(as);
/*
* Wait for any in flight writes to finish before we free the old nodes
* on disk:
*/
for (i = 0; i < as->nr_old_nodes; i++) {
__le64 seq;
b = as->old_nodes[i];
btree_node_lock_nopath_nofail(trans, &b->c, SIX_LOCK_read);
seq = b->data ? b->data->keys.seq : 0;
six_unlock_read(&b->c.lock);
if (seq == as->old_nodes_seq[i])
wait_on_bit_io(&b->flags, BTREE_NODE_write_in_flight_inner,
TASK_UNINTERRUPTIBLE);
}
/*
* We did an update to a parent node where the pointers we added pointed
* to child nodes that weren't written yet: now, the child nodes have
* been written so we can write out the update to the interior node.
*/
/*
* We can't call into journal reclaim here: we'd block on the journal
* reclaim lock, but we may need to release the open buckets we have
* pinned in order for other btree updates to make forward progress, and
* journal reclaim does btree updates when flushing bkey_cached entries,
* which may require allocations as well.
*/
ret = commit_do(trans, &as->disk_res, &journal_seq,
BCH_WATERMARK_interior_updates|
BCH_TRANS_COMMIT_no_enospc|
BCH_TRANS_COMMIT_no_check_rw|
BCH_TRANS_COMMIT_journal_reclaim,
btree_update_nodes_written_trans(trans, as));
bch2_trans_unlock(trans);
bch2_fs_fatal_err_on(ret && !bch2_journal_error(&c->journal), c,
"%s", bch2_err_str(ret));
err:
/*
* Ensure transaction is unlocked before using btree_node_lock_nopath()
* (the use of which is always suspect, we need to work on removing this
* in the future)
*
* It should be, but bch2_path_get_unlocked_mut() -> bch2_path_get()
* calls bch2_path_upgrade(), before we call path_make_mut(), so we may
* rarely end up with a locked path besides the one we have here:
*/
bch2_trans_unlock(trans);
bch2_trans_begin(trans);
/*
* We have to be careful because another thread might be getting ready
* to free as->b and calling btree_update_reparent() on us - we'll
* recheck under btree_update_lock below:
*/
b = READ_ONCE(as->b);
if (b) {
/*
* @b is the node we did the final insert into:
*
* On failure to get a journal reservation, we still have to
* unblock the write and allow most of the write path to happen
* so that shutdown works, but the i->journal_seq mechanism
* won't work to prevent the btree write from being visible (we
* didn't get a journal sequence number) - instead
* __bch2_btree_node_write() doesn't do the actual write if
* we're in journal error state:
*/
btree_path_idx_t path_idx = bch2_path_get_unlocked_mut(trans,
as->btree_id, b->c.level, b->key.k.p);
struct btree_path *path = trans->paths + path_idx;
btree_node_lock_nopath_nofail(trans, &b->c, SIX_LOCK_intent);
mark_btree_node_locked(trans, path, b->c.level, BTREE_NODE_INTENT_LOCKED);
path->l[b->c.level].lock_seq = six_lock_seq(&b->c.lock);
path->l[b->c.level].b = b;
bch2_btree_node_lock_write_nofail(trans, path, &b->c);
mutex_lock(&c->btree_interior_update_lock);
list_del(&as->write_blocked_list);
if (list_empty(&b->write_blocked))
clear_btree_node_write_blocked(b);
/*
* Node might have been freed, recheck under
* btree_interior_update_lock:
*/
if (as->b == b) {
BUG_ON(!b->c.level);
BUG_ON(!btree_node_dirty(b));
if (!ret) {
struct bset *last = btree_bset_last(b);
last->journal_seq = cpu_to_le64(
max(journal_seq,
le64_to_cpu(last->journal_seq)));
bch2_btree_add_journal_pin(c, b, journal_seq);
} else {
/*
* If we didn't get a journal sequence number we
* can't write this btree node, because recovery
* won't know to ignore this write:
*/
set_btree_node_never_write(b);
}
}
mutex_unlock(&c->btree_interior_update_lock);
mark_btree_node_locked_noreset(path, b->c.level, BTREE_NODE_INTENT_LOCKED);
six_unlock_write(&b->c.lock);
btree_node_write_if_need(c, b, SIX_LOCK_intent);
btree_node_unlock(trans, path, b->c.level);
bch2_path_put(trans, path_idx, true);
}
bch2_journal_pin_drop(&c->journal, &as->journal);
mutex_lock(&c->btree_interior_update_lock);
for (i = 0; i < as->nr_new_nodes; i++) {
b = as->new_nodes[i];
BUG_ON(b->will_make_reachable != (unsigned long) as);
b->will_make_reachable = 0;
clear_btree_node_will_make_reachable(b);
}
mutex_unlock(&c->btree_interior_update_lock);
for (i = 0; i < as->nr_new_nodes; i++) {
b = as->new_nodes[i];
btree_node_lock_nopath_nofail(trans, &b->c, SIX_LOCK_read);
btree_node_write_if_need(c, b, SIX_LOCK_read);
six_unlock_read(&b->c.lock);
}
for (i = 0; i < as->nr_open_buckets; i++)
bch2_open_bucket_put(c, c->open_buckets + as->open_buckets[i]);
bch2_btree_update_free(as, trans);
bch2_trans_put(trans);
}
static void btree_interior_update_work(struct work_struct *work)
{
struct bch_fs *c =
container_of(work, struct bch_fs, btree_interior_update_work);
struct btree_update *as;
while (1) {
mutex_lock(&c->btree_interior_update_lock);
as = list_first_entry_or_null(&c->btree_interior_updates_unwritten,
struct btree_update, unwritten_list);
if (as && !as->nodes_written)
as = NULL;
mutex_unlock(&c->btree_interior_update_lock);
if (!as)
break;
btree_update_nodes_written(as);
}
}
static CLOSURE_CALLBACK(btree_update_set_nodes_written)
{
closure_type(as, struct btree_update, cl);
struct bch_fs *c = as->c;
mutex_lock(&c->btree_interior_update_lock);
as->nodes_written = true;
mutex_unlock(&c->btree_interior_update_lock);
queue_work(c->btree_interior_update_worker, &c->btree_interior_update_work);
}
/*
* We're updating @b with pointers to nodes that haven't finished writing yet:
* block @b from being written until @as completes
*/
static void btree_update_updated_node(struct btree_update *as, struct btree *b)
{
struct bch_fs *c = as->c;
BUG_ON(as->mode != BTREE_UPDATE_none);
BUG_ON(as->update_level_end < b->c.level);
BUG_ON(!btree_node_dirty(b));
BUG_ON(!b->c.level);
mutex_lock(&c->btree_interior_update_lock);
list_add_tail(&as->unwritten_list, &c->btree_interior_updates_unwritten);
as->mode = BTREE_UPDATE_node;
as->b = b;
as->update_level_end = b->c.level;
set_btree_node_write_blocked(b);
list_add(&as->write_blocked_list, &b->write_blocked);
mutex_unlock(&c->btree_interior_update_lock);
}
static int bch2_update_reparent_journal_pin_flush(struct journal *j,
struct journal_entry_pin *_pin, u64 seq)
{
return 0;
}
static void btree_update_reparent(struct btree_update *as,
struct btree_update *child)
{
struct bch_fs *c = as->c;
lockdep_assert_held(&c->btree_interior_update_lock);
child->b = NULL;
child->mode = BTREE_UPDATE_update;
bch2_journal_pin_copy(&c->journal, &as->journal, &child->journal,
bch2_update_reparent_journal_pin_flush);
}
static void btree_update_updated_root(struct btree_update *as, struct btree *b)
{
struct bkey_i *insert = &b->key;
struct bch_fs *c = as->c;
BUG_ON(as->mode != BTREE_UPDATE_none);
BUG_ON(as->journal_u64s + jset_u64s(insert->k.u64s) >
ARRAY_SIZE(as->journal_entries));
as->journal_u64s +=
journal_entry_set((void *) &as->journal_entries[as->journal_u64s],
BCH_JSET_ENTRY_btree_root,
b->c.btree_id, b->c.level,
insert, insert->k.u64s);
mutex_lock(&c->btree_interior_update_lock);
list_add_tail(&as->unwritten_list, &c->btree_interior_updates_unwritten);
as->mode = BTREE_UPDATE_root;
mutex_unlock(&c->btree_interior_update_lock);
}
/*
* bch2_btree_update_add_new_node:
*
* This causes @as to wait on @b to be written, before it gets to
* bch2_btree_update_nodes_written
*
* Additionally, it sets b->will_make_reachable to prevent any additional writes
* to @b from happening besides the first until @b is reachable on disk
*
* And it adds @b to the list of @as's new nodes, so that we can update sector
* counts in bch2_btree_update_nodes_written:
*/
static void bch2_btree_update_add_new_node(struct btree_update *as, struct btree *b)
{
struct bch_fs *c = as->c;
closure_get(&as->cl);
mutex_lock(&c->btree_interior_update_lock);
BUG_ON(as->nr_new_nodes >= ARRAY_SIZE(as->new_nodes));
BUG_ON(b->will_make_reachable);
as->new_nodes[as->nr_new_nodes++] = b;
b->will_make_reachable = 1UL|(unsigned long) as;
set_btree_node_will_make_reachable(b);
mutex_unlock(&c->btree_interior_update_lock);
btree_update_add_key(as, &as->new_keys, b);
if (b->key.k.type == KEY_TYPE_btree_ptr_v2) {
unsigned bytes = vstruct_end(&b->data->keys) - (void *) b->data;
unsigned sectors = round_up(bytes, block_bytes(c)) >> 9;
bkey_i_to_btree_ptr_v2(&b->key)->v.sectors_written =
cpu_to_le16(sectors);
}
}
/*
* returns true if @b was a new node
*/
static void btree_update_drop_new_node(struct bch_fs *c, struct btree *b)
{
struct btree_update *as;
unsigned long v;
unsigned i;
mutex_lock(&c->btree_interior_update_lock);
/*
* When b->will_make_reachable != 0, it owns a ref on as->cl that's
* dropped when it gets written by bch2_btree_complete_write - the
* xchg() is for synchronization with bch2_btree_complete_write:
*/
v = xchg(&b->will_make_reachable, 0);
clear_btree_node_will_make_reachable(b);
as = (struct btree_update *) (v & ~1UL);
if (!as) {
mutex_unlock(&c->btree_interior_update_lock);
return;
}
for (i = 0; i < as->nr_new_nodes; i++)
if (as->new_nodes[i] == b)
goto found;
BUG();
found:
array_remove_item(as->new_nodes, as->nr_new_nodes, i);
mutex_unlock(&c->btree_interior_update_lock);
if (v & 1)
closure_put(&as->cl);
}
static void bch2_btree_update_get_open_buckets(struct btree_update *as, struct btree *b)
{
while (b->ob.nr)
as->open_buckets[as->nr_open_buckets++] =
b->ob.v[--b->ob.nr];
}
static int bch2_btree_update_will_free_node_journal_pin_flush(struct journal *j,
struct journal_entry_pin *_pin, u64 seq)
{
return 0;
}
/*
* @b is being split/rewritten: it may have pointers to not-yet-written btree
* nodes and thus outstanding btree_updates - redirect @b's
* btree_updates to point to this btree_update:
*/
static void bch2_btree_interior_update_will_free_node(struct btree_update *as,
struct btree *b)
{
struct bch_fs *c = as->c;
struct btree_update *p, *n;
struct btree_write *w;
set_btree_node_dying(b);
if (btree_node_fake(b))
return;
mutex_lock(&c->btree_interior_update_lock);
/*
* Does this node have any btree_update operations preventing
* it from being written?
*
* If so, redirect them to point to this btree_update: we can
* write out our new nodes, but we won't make them visible until those
* operations complete
*/
list_for_each_entry_safe(p, n, &b->write_blocked, write_blocked_list) {
list_del_init(&p->write_blocked_list);
btree_update_reparent(as, p);
/*
* for flush_held_btree_writes() waiting on updates to flush or
* nodes to be writeable:
*/
closure_wake_up(&c->btree_interior_update_wait);
}
clear_btree_node_dirty_acct(c, b);
clear_btree_node_need_write(b);
clear_btree_node_write_blocked(b);
/*
* Does this node have unwritten data that has a pin on the journal?
*
* If so, transfer that pin to the btree_update operation -
* note that if we're freeing multiple nodes, we only need to keep the
* oldest pin of any of the nodes we're freeing. We'll release the pin
* when the new nodes are persistent and reachable on disk:
*/
w = btree_current_write(b);
bch2_journal_pin_copy(&c->journal, &as->journal, &w->journal,
bch2_btree_update_will_free_node_journal_pin_flush);
bch2_journal_pin_drop(&c->journal, &w->journal);
w = btree_prev_write(b);
bch2_journal_pin_copy(&c->journal, &as->journal, &w->journal,
bch2_btree_update_will_free_node_journal_pin_flush);
bch2_journal_pin_drop(&c->journal, &w->journal);
mutex_unlock(&c->btree_interior_update_lock);
/*
* Is this a node that isn't reachable on disk yet?
*
* Nodes that aren't reachable yet have writes blocked until they're
* reachable - now that we've cancelled any pending writes and moved
* things waiting on that write to wait on this update, we can drop this
* node from the list of nodes that the other update is making
* reachable, prior to freeing it:
*/
btree_update_drop_new_node(c, b);
btree_update_add_key(as, &as->old_keys, b);
as->old_nodes[as->nr_old_nodes] = b;
as->old_nodes_seq[as->nr_old_nodes] = b->data->keys.seq;
as->nr_old_nodes++;
}
static void bch2_btree_update_done(struct btree_update *as, struct btree_trans *trans)
{
struct bch_fs *c = as->c;
u64 start_time = as->start_time;
BUG_ON(as->mode == BTREE_UPDATE_none);
if (as->took_gc_lock)
up_read(&as->c->gc_lock);
as->took_gc_lock = false;
bch2_btree_reserve_put(as, trans);
continue_at(&as->cl, btree_update_set_nodes_written,
as->c->btree_interior_update_worker);
bch2_time_stats_update(&c->times[BCH_TIME_btree_interior_update_foreground],
start_time);
}
static struct btree_update *
bch2_btree_update_start(struct btree_trans *trans, struct btree_path *path,
unsigned level_start, bool split, unsigned flags)
{
struct bch_fs *c = trans->c;
struct btree_update *as;
u64 start_time = local_clock();
int disk_res_flags = (flags & BCH_TRANS_COMMIT_no_enospc)
? BCH_DISK_RESERVATION_NOFAIL : 0;
unsigned nr_nodes[2] = { 0, 0 };
unsigned level_end = level_start;
enum bch_watermark watermark = flags & BCH_WATERMARK_MASK;
int ret = 0;
u32 restart_count = trans->restart_count;
BUG_ON(!path->should_be_locked);
if (watermark == BCH_WATERMARK_copygc)
watermark = BCH_WATERMARK_btree_copygc;
if (watermark < BCH_WATERMARK_btree)
watermark = BCH_WATERMARK_btree;
flags &= ~BCH_WATERMARK_MASK;
flags |= watermark;
if (watermark < BCH_WATERMARK_reclaim &&
test_bit(JOURNAL_space_low, &c->journal.flags)) {
if (flags & BCH_TRANS_COMMIT_journal_reclaim)
return ERR_PTR(-BCH_ERR_journal_reclaim_would_deadlock);
ret = drop_locks_do(trans,
({ wait_event(c->journal.wait, !test_bit(JOURNAL_space_low, &c->journal.flags)); 0; }));
if (ret)
return ERR_PTR(ret);
}
while (1) {
nr_nodes[!!level_end] += 1 + split;
level_end++;
ret = bch2_btree_path_upgrade(trans, path, level_end + 1);
if (ret)
return ERR_PTR(ret);
if (!btree_path_node(path, level_end)) {
/* Allocating new root? */
nr_nodes[1] += split;
level_end = BTREE_MAX_DEPTH;
break;
}
/*
* Always check for space for two keys, even if we won't have to
* split at prior level - it might have been a merge instead:
*/
if (bch2_btree_node_insert_fits(path->l[level_end].b,
BKEY_BTREE_PTR_U64s_MAX * 2))
break;
split = path->l[level_end].b->nr.live_u64s > BTREE_SPLIT_THRESHOLD(c);
}
if (!down_read_trylock(&c->gc_lock)) {
ret = drop_locks_do(trans, (down_read(&c->gc_lock), 0));
if (ret) {
up_read(&c->gc_lock);
return ERR_PTR(ret);
}
}
as = mempool_alloc(&c->btree_interior_update_pool, GFP_NOFS);
memset(as, 0, sizeof(*as));
closure_init(&as->cl, NULL);
as->c = c;
as->start_time = start_time;
as->ip_started = _RET_IP_;
as->mode = BTREE_UPDATE_none;
as->flags = flags;
as->took_gc_lock = true;
as->btree_id = path->btree_id;
as->update_level_start = level_start;
as->update_level_end = level_end;
INIT_LIST_HEAD(&as->list);
INIT_LIST_HEAD(&as->unwritten_list);
INIT_LIST_HEAD(&as->write_blocked_list);
bch2_keylist_init(&as->old_keys, as->_old_keys);
bch2_keylist_init(&as->new_keys, as->_new_keys);
bch2_keylist_init(&as->parent_keys, as->inline_keys);
mutex_lock(&c->btree_interior_update_lock);
list_add_tail(&as->list, &c->btree_interior_update_list);
mutex_unlock(&c->btree_interior_update_lock);
/*
* We don't want to allocate if we're in an error state, that can cause
* deadlock on emergency shutdown due to open buckets getting stuck in
* the btree_reserve_cache after allocator shutdown has cleared it out.
* This check needs to come after adding us to the btree_interior_update
* list but before calling bch2_btree_reserve_get, to synchronize with
* __bch2_fs_read_only().
*/
ret = bch2_journal_error(&c->journal);
if (ret)
goto err;
ret = bch2_disk_reservation_get(c, &as->disk_res,
(nr_nodes[0] + nr_nodes[1]) * btree_sectors(c),
c->opts.metadata_replicas,
disk_res_flags);
if (ret)
goto err;
ret = bch2_btree_reserve_get(trans, as, nr_nodes, flags, NULL);
if (bch2_err_matches(ret, ENOSPC) ||
bch2_err_matches(ret, ENOMEM)) {
struct closure cl;
/*
* XXX: this should probably be a separate BTREE_INSERT_NONBLOCK
* flag
*/
if (bch2_err_matches(ret, ENOSPC) &&
(flags & BCH_TRANS_COMMIT_journal_reclaim) &&
watermark < BCH_WATERMARK_reclaim) {
ret = -BCH_ERR_journal_reclaim_would_deadlock;
goto err;
}
closure_init_stack(&cl);
do {
ret = bch2_btree_reserve_get(trans, as, nr_nodes, flags, &cl);
bch2_trans_unlock(trans);
bch2_wait_on_allocator(c, &cl);
} while (bch2_err_matches(ret, BCH_ERR_operation_blocked));
}
if (ret) {
trace_and_count(c, btree_reserve_get_fail, trans->fn,
_RET_IP_, nr_nodes[0] + nr_nodes[1], ret);
goto err;
}
ret = bch2_trans_relock(trans);
if (ret)
goto err;
bch2_trans_verify_not_restarted(trans, restart_count);
return as;
err:
bch2_btree_update_free(as, trans);
if (!bch2_err_matches(ret, ENOSPC) &&
!bch2_err_matches(ret, EROFS) &&
ret != -BCH_ERR_journal_reclaim_would_deadlock)
bch_err_fn_ratelimited(c, ret);
return ERR_PTR(ret);
}
/* Btree root updates: */
static void bch2_btree_set_root_inmem(struct bch_fs *c, struct btree *b)
{
/* Root nodes cannot be reaped */
mutex_lock(&c->btree_cache.lock);
list_del_init(&b->list);
mutex_unlock(&c->btree_cache.lock);
mutex_lock(&c->btree_root_lock);
bch2_btree_id_root(c, b->c.btree_id)->b = b;
mutex_unlock(&c->btree_root_lock);
bch2_recalc_btree_reserve(c);
}
static int bch2_btree_set_root(struct btree_update *as,
struct btree_trans *trans,
struct btree_path *path,
struct btree *b,
bool nofail)
{
struct bch_fs *c = as->c;
trace_and_count(c, btree_node_set_root, trans, b);
struct btree *old = btree_node_root(c, b);
/*
* Ensure no one is using the old root while we switch to the
* new root:
*/
if (nofail) {
bch2_btree_node_lock_write_nofail(trans, path, &old->c);
} else {
int ret = bch2_btree_node_lock_write(trans, path, &old->c);
if (ret)
return ret;
}
bch2_btree_set_root_inmem(c, b);
btree_update_updated_root(as, b);
/*
* Unlock old root after new root is visible:
*
* The new root isn't persistent, but that's ok: we still have
* an intent lock on the new root, and any updates that would
* depend on the new root would have to update the new root.
*/
bch2_btree_node_unlock_write(trans, path, old);
return 0;
}
/* Interior node updates: */
static void bch2_insert_fixup_btree_ptr(struct btree_update *as,
struct btree_trans *trans,
struct btree_path *path,
struct btree *b,
struct btree_node_iter *node_iter,
struct bkey_i *insert)
{
struct bch_fs *c = as->c;
struct bkey_packed *k;
struct printbuf buf = PRINTBUF;
unsigned long old, new;
BUG_ON(insert->k.type == KEY_TYPE_btree_ptr_v2 &&
!btree_ptr_sectors_written(bkey_i_to_s_c(insert)));
if (unlikely(!test_bit(JOURNAL_replay_done, &c->journal.flags)))
bch2_journal_key_overwritten(c, b->c.btree_id, b->c.level, insert->k.p);
if (bch2_bkey_validate(c, bkey_i_to_s_c(insert),
btree_node_type(b), BCH_VALIDATE_write) ?:
bch2_bkey_in_btree_node(c, b, bkey_i_to_s_c(insert), BCH_VALIDATE_write)) {
bch2_fs_inconsistent(c, "%s: inserting invalid bkey", __func__);
dump_stack();
}
BUG_ON(as->journal_u64s + jset_u64s(insert->k.u64s) >
ARRAY_SIZE(as->journal_entries));
as->journal_u64s +=
journal_entry_set((void *) &as->journal_entries[as->journal_u64s],
BCH_JSET_ENTRY_btree_keys,
b->c.btree_id, b->c.level,
insert, insert->k.u64s);
while ((k = bch2_btree_node_iter_peek_all(node_iter, b)) &&
bkey_iter_pos_cmp(b, k, &insert->k.p) < 0)
bch2_btree_node_iter_advance(node_iter, b);
bch2_btree_bset_insert_key(trans, path, b, node_iter, insert);
set_btree_node_dirty_acct(c, b);
old = READ_ONCE(b->flags);
do {
new = old;
new &= ~BTREE_WRITE_TYPE_MASK;
new |= BTREE_WRITE_interior;
new |= 1 << BTREE_NODE_need_write;
} while (!try_cmpxchg(&b->flags, &old, new));
printbuf_exit(&buf);
}
static void
bch2_btree_insert_keys_interior(struct btree_update *as,
struct btree_trans *trans,
struct btree_path *path,
struct btree *b,
struct btree_node_iter node_iter,
struct keylist *keys)
{
struct bkey_i *insert = bch2_keylist_front(keys);
struct bkey_packed *k;
BUG_ON(btree_node_type(b) != BKEY_TYPE_btree);
while ((k = bch2_btree_node_iter_prev_all(&node_iter, b)) &&
(bkey_cmp_left_packed(b, k, &insert->k.p) >= 0))
;
while (!bch2_keylist_empty(keys)) {
insert = bch2_keylist_front(keys);
if (bpos_gt(insert->k.p, b->key.k.p))
break;
bch2_insert_fixup_btree_ptr(as, trans, path, b, &node_iter, insert);
bch2_keylist_pop_front(keys);
}
}
/*
* Move keys from n1 (original replacement node, now lower node) to n2 (higher
* node)
*/
static void __btree_split_node(struct btree_update *as,
struct btree_trans *trans,
struct btree *b,
struct btree *n[2])
{
struct bkey_packed *k;
struct bpos n1_pos = POS_MIN;
struct btree_node_iter iter;
struct bset *bsets[2];
struct bkey_format_state format[2];
struct bkey_packed *out[2];
struct bkey uk;
unsigned u64s, n1_u64s = (b->nr.live_u64s * 3) / 5;
struct { unsigned nr_keys, val_u64s; } nr_keys[2];
int i;
memset(&nr_keys, 0, sizeof(nr_keys));
for (i = 0; i < 2; i++) {
BUG_ON(n[i]->nsets != 1);
bsets[i] = btree_bset_first(n[i]);
out[i] = bsets[i]->start;
SET_BTREE_NODE_SEQ(n[i]->data, BTREE_NODE_SEQ(b->data) + 1);
bch2_bkey_format_init(&format[i]);
}
u64s = 0;
for_each_btree_node_key(b, k, &iter) {
if (bkey_deleted(k))
continue;
uk = bkey_unpack_key(b, k);
if (b->c.level &&
u64s < n1_u64s &&
u64s + k->u64s >= n1_u64s &&
bch2_key_deleted_in_journal(trans, b->c.btree_id, b->c.level, uk.p))
n1_u64s += k->u64s;
i = u64s >= n1_u64s;
u64s += k->u64s;
if (!i)
n1_pos = uk.p;
bch2_bkey_format_add_key(&format[i], &uk);
nr_keys[i].nr_keys++;
nr_keys[i].val_u64s += bkeyp_val_u64s(&b->format, k);
}
btree_set_min(n[0], b->data->min_key);
btree_set_max(n[0], n1_pos);
btree_set_min(n[1], bpos_successor(n1_pos));
btree_set_max(n[1], b->data->max_key);
for (i = 0; i < 2; i++) {
bch2_bkey_format_add_pos(&format[i], n[i]->data->min_key);
bch2_bkey_format_add_pos(&format[i], n[i]->data->max_key);
n[i]->data->format = bch2_bkey_format_done(&format[i]);
unsigned u64s = nr_keys[i].nr_keys * n[i]->data->format.key_u64s +
nr_keys[i].val_u64s;
if (__vstruct_bytes(struct btree_node, u64s) > btree_buf_bytes(b))
n[i]->data->format = b->format;
btree_node_set_format(n[i], n[i]->data->format);
}
u64s = 0;
for_each_btree_node_key(b, k, &iter) {
if (bkey_deleted(k))
continue;
i = u64s >= n1_u64s;
u64s += k->u64s;
if (bch2_bkey_transform(&n[i]->format, out[i], bkey_packed(k)
? &b->format: &bch2_bkey_format_current, k))
out[i]->format = KEY_FORMAT_LOCAL_BTREE;
else
bch2_bkey_unpack(b, (void *) out[i], k);
out[i]->needs_whiteout = false;
btree_keys_account_key_add(&n[i]->nr, 0, out[i]);
out[i] = bkey_p_next(out[i]);
}
for (i = 0; i < 2; i++) {
bsets[i]->u64s = cpu_to_le16((u64 *) out[i] - bsets[i]->_data);
BUG_ON(!bsets[i]->u64s);
set_btree_bset_end(n[i], n[i]->set);
btree_node_reset_sib_u64s(n[i]);
bch2_verify_btree_nr_keys(n[i]);
BUG_ON(bch2_btree_node_check_topology(trans, n[i]));
}
}
/*
* For updates to interior nodes, we've got to do the insert before we split
* because the stuff we're inserting has to be inserted atomically. Post split,
* the keys might have to go in different nodes and the split would no longer be
* atomic.
*
* Worse, if the insert is from btree node coalescing, if we do the insert after
* we do the split (and pick the pivot) - the pivot we pick might be between
* nodes that were coalesced, and thus in the middle of a child node post
* coalescing:
*/
static void btree_split_insert_keys(struct btree_update *as,
struct btree_trans *trans,
btree_path_idx_t path_idx,
struct btree *b,
struct keylist *keys)
{
struct btree_path *path = trans->paths + path_idx;
if (!bch2_keylist_empty(keys) &&
bpos_le(bch2_keylist_front(keys)->k.p, b->data->max_key)) {
struct btree_node_iter node_iter;
bch2_btree_node_iter_init(&node_iter, b, &bch2_keylist_front(keys)->k.p);
bch2_btree_insert_keys_interior(as, trans, path, b, node_iter, keys);
BUG_ON(bch2_btree_node_check_topology(trans, b));
}
}
static int btree_split(struct btree_update *as, struct btree_trans *trans,
btree_path_idx_t path, struct btree *b,
struct keylist *keys)
{
struct bch_fs *c = as->c;
struct btree *parent = btree_node_parent(trans->paths + path, b);
struct btree *n1, *n2 = NULL, *n3 = NULL;
btree_path_idx_t path1 = 0, path2 = 0;
u64 start_time = local_clock();
int ret = 0;
bch2_verify_btree_nr_keys(b);
BUG_ON(!parent && (b != btree_node_root(c, b)));
BUG_ON(parent && !btree_node_intent_locked(trans->paths + path, b->c.level + 1));
ret = bch2_btree_node_check_topology(trans, b);
if (ret)
return ret;
bch2_btree_interior_update_will_free_node(as, b);
if (b->nr.live_u64s > BTREE_SPLIT_THRESHOLD(c)) {
struct btree *n[2];
trace_and_count(c, btree_node_split, trans, b);
n[0] = n1 = bch2_btree_node_alloc(as, trans, b->c.level);
n[1] = n2 = bch2_btree_node_alloc(as, trans, b->c.level);
__btree_split_node(as, trans, b, n);
if (keys) {
btree_split_insert_keys(as, trans, path, n1, keys);
btree_split_insert_keys(as, trans, path, n2, keys);
BUG_ON(!bch2_keylist_empty(keys));
}
bch2_btree_build_aux_trees(n2);
bch2_btree_build_aux_trees(n1);
bch2_btree_update_add_new_node(as, n1);
bch2_btree_update_add_new_node(as, n2);
six_unlock_write(&n2->c.lock);
six_unlock_write(&n1->c.lock);
path1 = bch2_path_get_unlocked_mut(trans, as->btree_id, n1->c.level, n1->key.k.p);
six_lock_increment(&n1->c.lock, SIX_LOCK_intent);
mark_btree_node_locked(trans, trans->paths + path1, n1->c.level, BTREE_NODE_INTENT_LOCKED);
bch2_btree_path_level_init(trans, trans->paths + path1, n1);
path2 = bch2_path_get_unlocked_mut(trans, as->btree_id, n2->c.level, n2->key.k.p);
six_lock_increment(&n2->c.lock, SIX_LOCK_intent);
mark_btree_node_locked(trans, trans->paths + path2, n2->c.level, BTREE_NODE_INTENT_LOCKED);
bch2_btree_path_level_init(trans, trans->paths + path2, n2);
/*
* Note that on recursive parent_keys == keys, so we
* can't start adding new keys to parent_keys before emptying it
* out (which we did with btree_split_insert_keys() above)
*/
bch2_keylist_add(&as->parent_keys, &n1->key);
bch2_keylist_add(&as->parent_keys, &n2->key);
if (!parent) {
/* Depth increases, make a new root */
n3 = __btree_root_alloc(as, trans, b->c.level + 1);
bch2_btree_update_add_new_node(as, n3);
six_unlock_write(&n3->c.lock);
trans->paths[path2].locks_want++;
BUG_ON(btree_node_locked(trans->paths + path2, n3->c.level));
six_lock_increment(&n3->c.lock, SIX_LOCK_intent);
mark_btree_node_locked(trans, trans->paths + path2, n3->c.level, BTREE_NODE_INTENT_LOCKED);
bch2_btree_path_level_init(trans, trans->paths + path2, n3);
n3->sib_u64s[0] = U16_MAX;
n3->sib_u64s[1] = U16_MAX;
btree_split_insert_keys(as, trans, path, n3, &as->parent_keys);
}
} else {
trace_and_count(c, btree_node_compact, trans, b);
n1 = bch2_btree_node_alloc_replacement(as, trans, b);
if (keys) {
btree_split_insert_keys(as, trans, path, n1, keys);
BUG_ON(!bch2_keylist_empty(keys));
}
bch2_btree_build_aux_trees(n1);
bch2_btree_update_add_new_node(as, n1);
six_unlock_write(&n1->c.lock);
path1 = bch2_path_get_unlocked_mut(trans, as->btree_id, n1->c.level, n1->key.k.p);
six_lock_increment(&n1->c.lock, SIX_LOCK_intent);
mark_btree_node_locked(trans, trans->paths + path1, n1->c.level, BTREE_NODE_INTENT_LOCKED);
bch2_btree_path_level_init(trans, trans->paths + path1, n1);
if (parent)
bch2_keylist_add(&as->parent_keys, &n1->key);
}
/* New nodes all written, now make them visible: */
if (parent) {
/* Split a non root node */
ret = bch2_btree_insert_node(as, trans, path, parent, &as->parent_keys);
} else if (n3) {
ret = bch2_btree_set_root(as, trans, trans->paths + path, n3, false);
} else {
/* Root filled up but didn't need to be split */
ret = bch2_btree_set_root(as, trans, trans->paths + path, n1, false);
}
if (ret)
goto err;
if (n3) {
bch2_btree_update_get_open_buckets(as, n3);
bch2_btree_node_write(c, n3, SIX_LOCK_intent, 0);
}
if (n2) {
bch2_btree_update_get_open_buckets(as, n2);
bch2_btree_node_write(c, n2, SIX_LOCK_intent, 0);
}
bch2_btree_update_get_open_buckets(as, n1);
bch2_btree_node_write(c, n1, SIX_LOCK_intent, 0);
/*
* The old node must be freed (in memory) _before_ unlocking the new
* nodes - else another thread could re-acquire a read lock on the old
* node after another thread has locked and updated the new node, thus
* seeing stale data:
*/
bch2_btree_node_free_inmem(trans, trans->paths + path, b);
if (n3)
bch2_trans_node_add(trans, trans->paths + path, n3);
if (n2)
bch2_trans_node_add(trans, trans->paths + path2, n2);
bch2_trans_node_add(trans, trans->paths + path1, n1);
if (n3)
six_unlock_intent(&n3->c.lock);
if (n2)
six_unlock_intent(&n2->c.lock);
six_unlock_intent(&n1->c.lock);
out:
if (path2) {
__bch2_btree_path_unlock(trans, trans->paths + path2);
bch2_path_put(trans, path2, true);
}
if (path1) {
__bch2_btree_path_unlock(trans, trans->paths + path1);
bch2_path_put(trans, path1, true);
}
bch2_trans_verify_locks(trans);
bch2_time_stats_update(&c->times[n2
? BCH_TIME_btree_node_split
: BCH_TIME_btree_node_compact],
start_time);
return ret;
err:
if (n3)
bch2_btree_node_free_never_used(as, trans, n3);
if (n2)
bch2_btree_node_free_never_used(as, trans, n2);
bch2_btree_node_free_never_used(as, trans, n1);
goto out;
}
/**
* bch2_btree_insert_node - insert bkeys into a given btree node
*
* @as: btree_update object
* @trans: btree_trans object
* @path_idx: path that points to current node
* @b: node to insert keys into
* @keys: list of keys to insert
*
* Returns: 0 on success, typically transaction restart error on failure
*
* Inserts as many keys as it can into a given btree node, splitting it if full.
* If a split occurred, this function will return early. This can only happen
* for leaf nodes -- inserts into interior nodes have to be atomic.
*/
static int bch2_btree_insert_node(struct btree_update *as, struct btree_trans *trans,
btree_path_idx_t path_idx, struct btree *b,
struct keylist *keys)
{
struct bch_fs *c = as->c;
struct btree_path *path = trans->paths + path_idx, *linked;
unsigned i;
int old_u64s = le16_to_cpu(btree_bset_last(b)->u64s);
int old_live_u64s = b->nr.live_u64s;
int live_u64s_added, u64s_added;
int ret;
lockdep_assert_held(&c->gc_lock);
BUG_ON(!btree_node_intent_locked(path, b->c.level));
BUG_ON(!b->c.level);
BUG_ON(!as || as->b);
bch2_verify_keylist_sorted(keys);
ret = bch2_btree_node_lock_write(trans, path, &b->c);
if (ret)
return ret;
bch2_btree_node_prep_for_write(trans, path, b);
if (!bch2_btree_node_insert_fits(b, bch2_keylist_u64s(keys))) {
bch2_btree_node_unlock_write(trans, path, b);
goto split;
}
ret = bch2_btree_node_check_topology(trans, b);
if (ret) {
bch2_btree_node_unlock_write(trans, path, b);
return ret;
}
bch2_btree_insert_keys_interior(as, trans, path, b,
path->l[b->c.level].iter, keys);
trans_for_each_path_with_node(trans, b, linked, i)
bch2_btree_node_iter_peek(&linked->l[b->c.level].iter, b);
bch2_trans_verify_paths(trans);
live_u64s_added = (int) b->nr.live_u64s - old_live_u64s;
u64s_added = (int) le16_to_cpu(btree_bset_last(b)->u64s) - old_u64s;
if (b->sib_u64s[0] != U16_MAX && live_u64s_added < 0)
b->sib_u64s[0] = max(0, (int) b->sib_u64s[0] + live_u64s_added);
if (b->sib_u64s[1] != U16_MAX && live_u64s_added < 0)
b->sib_u64s[1] = max(0, (int) b->sib_u64s[1] + live_u64s_added);
if (u64s_added > live_u64s_added &&
bch2_maybe_compact_whiteouts(c, b))
bch2_trans_node_reinit_iter(trans, b);
btree_update_updated_node(as, b);
bch2_btree_node_unlock_write(trans, path, b);
BUG_ON(bch2_btree_node_check_topology(trans, b));
return 0;
split:
/*
* We could attempt to avoid the transaction restart, by calling
* bch2_btree_path_upgrade() and allocating more nodes:
*/
if (b->c.level >= as->update_level_end) {
trace_and_count(c, trans_restart_split_race, trans, _THIS_IP_, b);
return btree_trans_restart(trans, BCH_ERR_transaction_restart_split_race);
}
return btree_split(as, trans, path_idx, b, keys);
}
int bch2_btree_split_leaf(struct btree_trans *trans,
btree_path_idx_t path,
unsigned flags)
{
/* btree_split & merge may both cause paths array to be reallocated */
struct btree *b = path_l(trans->paths + path)->b;
struct btree_update *as;
unsigned l;
int ret = 0;
as = bch2_btree_update_start(trans, trans->paths + path,
trans->paths[path].level,
true, flags);
if (IS_ERR(as))
return PTR_ERR(as);
ret = btree_split(as, trans, path, b, NULL);
if (ret) {
bch2_btree_update_free(as, trans);
return ret;
}
bch2_btree_update_done(as, trans);
for (l = trans->paths[path].level + 1;
btree_node_intent_locked(&trans->paths[path], l) && !ret;
l++)
ret = bch2_foreground_maybe_merge(trans, path, l, flags);
return ret;
}
static void __btree_increase_depth(struct btree_update *as, struct btree_trans *trans,
btree_path_idx_t path_idx)
{
struct bch_fs *c = as->c;
struct btree_path *path = trans->paths + path_idx;
struct btree *n, *b = bch2_btree_id_root(c, path->btree_id)->b;
BUG_ON(!btree_node_locked(path, b->c.level));
n = __btree_root_alloc(as, trans, b->c.level + 1);
bch2_btree_update_add_new_node(as, n);
six_unlock_write(&n->c.lock);
path->locks_want++;
BUG_ON(btree_node_locked(path, n->c.level));
six_lock_increment(&n->c.lock, SIX_LOCK_intent);
mark_btree_node_locked(trans, path, n->c.level, BTREE_NODE_INTENT_LOCKED);
bch2_btree_path_level_init(trans, path, n);
n->sib_u64s[0] = U16_MAX;
n->sib_u64s[1] = U16_MAX;
bch2_keylist_add(&as->parent_keys, &b->key);
btree_split_insert_keys(as, trans, path_idx, n, &as->parent_keys);
int ret = bch2_btree_set_root(as, trans, path, n, true);
BUG_ON(ret);
bch2_btree_update_get_open_buckets(as, n);
bch2_btree_node_write(c, n, SIX_LOCK_intent, 0);
bch2_trans_node_add(trans, path, n);
six_unlock_intent(&n->c.lock);
mutex_lock(&c->btree_cache.lock);
list_add_tail(&b->list, &c->btree_cache.live[btree_node_pinned(b)].list);
mutex_unlock(&c->btree_cache.lock);
bch2_trans_verify_locks(trans);
}
int bch2_btree_increase_depth(struct btree_trans *trans, btree_path_idx_t path, unsigned flags)
{
struct bch_fs *c = trans->c;
struct btree *b = bch2_btree_id_root(c, trans->paths[path].btree_id)->b;
if (btree_node_fake(b))
return bch2_btree_split_leaf(trans, path, flags);
struct btree_update *as =
bch2_btree_update_start(trans, trans->paths + path, b->c.level, true, flags);
if (IS_ERR(as))
return PTR_ERR(as);
__btree_increase_depth(as, trans, path);
bch2_btree_update_done(as, trans);
return 0;
}
int __bch2_foreground_maybe_merge(struct btree_trans *trans,
btree_path_idx_t path,
unsigned level,
unsigned flags,
enum btree_node_sibling sib)
{
struct bch_fs *c = trans->c;
struct btree_update *as;
struct bkey_format_state new_s;
struct bkey_format new_f;
struct bkey_i delete;
struct btree *b, *m, *n, *prev, *next, *parent;
struct bpos sib_pos;
size_t sib_u64s;
enum btree_id btree = trans->paths[path].btree_id;
btree_path_idx_t sib_path = 0, new_path = 0;
u64 start_time = local_clock();
int ret = 0;
bch2_trans_verify_not_in_restart(trans);
bch2_trans_verify_not_unlocked(trans);
BUG_ON(!trans->paths[path].should_be_locked);
BUG_ON(!btree_node_locked(&trans->paths[path], level));
/*
* Work around a deadlock caused by the btree write buffer not doing
* merges and leaving tons of merges for us to do - we really don't need
* to be doing merges at all from the interior update path, and if the
* interior update path is generating too many new interior updates we
* deadlock:
*/
if ((flags & BCH_WATERMARK_MASK) == BCH_WATERMARK_interior_updates)
return 0;
if ((flags & BCH_WATERMARK_MASK) <= BCH_WATERMARK_reclaim) {
flags &= ~BCH_WATERMARK_MASK;
flags |= BCH_WATERMARK_btree;
flags |= BCH_TRANS_COMMIT_journal_reclaim;
}
b = trans->paths[path].l[level].b;
if ((sib == btree_prev_sib && bpos_eq(b->data->min_key, POS_MIN)) ||
(sib == btree_next_sib && bpos_eq(b->data->max_key, SPOS_MAX))) {
b->sib_u64s[sib] = U16_MAX;
return 0;
}
sib_pos = sib == btree_prev_sib
? bpos_predecessor(b->data->min_key)
: bpos_successor(b->data->max_key);
sib_path = bch2_path_get(trans, btree, sib_pos,
U8_MAX, level, BTREE_ITER_intent, _THIS_IP_);
ret = bch2_btree_path_traverse(trans, sib_path, false);
if (ret)
goto err;
btree_path_set_should_be_locked(trans, trans->paths + sib_path);
m = trans->paths[sib_path].l[level].b;
if (btree_node_parent(trans->paths + path, b) !=
btree_node_parent(trans->paths + sib_path, m)) {
b->sib_u64s[sib] = U16_MAX;
goto out;
}
if (sib == btree_prev_sib) {
prev = m;
next = b;
} else {
prev = b;
next = m;
}
if (!bpos_eq(bpos_successor(prev->data->max_key), next->data->min_key)) {
struct printbuf buf1 = PRINTBUF, buf2 = PRINTBUF;
bch2_bpos_to_text(&buf1, prev->data->max_key);
bch2_bpos_to_text(&buf2, next->data->min_key);
bch_err(c,
"%s(): btree topology error:\n"
" prev ends at %s\n"
" next starts at %s",
__func__, buf1.buf, buf2.buf);
printbuf_exit(&buf1);
printbuf_exit(&buf2);
ret = bch2_topology_error(c);
goto err;
}
bch2_bkey_format_init(&new_s);
bch2_bkey_format_add_pos(&new_s, prev->data->min_key);
__bch2_btree_calc_format(&new_s, prev);
__bch2_btree_calc_format(&new_s, next);
bch2_bkey_format_add_pos(&new_s, next->data->max_key);
new_f = bch2_bkey_format_done(&new_s);
sib_u64s = btree_node_u64s_with_format(b->nr, &b->format, &new_f) +
btree_node_u64s_with_format(m->nr, &m->format, &new_f);
if (sib_u64s > BTREE_FOREGROUND_MERGE_HYSTERESIS(c)) {
sib_u64s -= BTREE_FOREGROUND_MERGE_HYSTERESIS(c);
sib_u64s /= 2;
sib_u64s += BTREE_FOREGROUND_MERGE_HYSTERESIS(c);
}
sib_u64s = min(sib_u64s, btree_max_u64s(c));
sib_u64s = min(sib_u64s, (size_t) U16_MAX - 1);
b->sib_u64s[sib] = sib_u64s;
if (b->sib_u64s[sib] > c->btree_foreground_merge_threshold)
goto out;
parent = btree_node_parent(trans->paths + path, b);
as = bch2_btree_update_start(trans, trans->paths + path, level, false,
BCH_TRANS_COMMIT_no_enospc|flags);
ret = PTR_ERR_OR_ZERO(as);
if (ret)
goto err;
trace_and_count(c, btree_node_merge, trans, b);
bch2_btree_interior_update_will_free_node(as, b);
bch2_btree_interior_update_will_free_node(as, m);
n = bch2_btree_node_alloc(as, trans, b->c.level);
SET_BTREE_NODE_SEQ(n->data,
max(BTREE_NODE_SEQ(b->data),
BTREE_NODE_SEQ(m->data)) + 1);
btree_set_min(n, prev->data->min_key);
btree_set_max(n, next->data->max_key);
n->data->format = new_f;
btree_node_set_format(n, new_f);
bch2_btree_sort_into(c, n, prev);
bch2_btree_sort_into(c, n, next);
bch2_btree_build_aux_trees(n);
bch2_btree_update_add_new_node(as, n);
six_unlock_write(&n->c.lock);
new_path = bch2_path_get_unlocked_mut(trans, btree, n->c.level, n->key.k.p);
six_lock_increment(&n->c.lock, SIX_LOCK_intent);
mark_btree_node_locked(trans, trans->paths + new_path, n->c.level, BTREE_NODE_INTENT_LOCKED);
bch2_btree_path_level_init(trans, trans->paths + new_path, n);
bkey_init(&delete.k);
delete.k.p = prev->key.k.p;
bch2_keylist_add(&as->parent_keys, &delete);
bch2_keylist_add(&as->parent_keys, &n->key);
bch2_trans_verify_paths(trans);
ret = bch2_btree_insert_node(as, trans, path, parent, &as->parent_keys);
if (ret)
goto err_free_update;
bch2_trans_verify_paths(trans);
bch2_btree_update_get_open_buckets(as, n);
bch2_btree_node_write(c, n, SIX_LOCK_intent, 0);
bch2_btree_node_free_inmem(trans, trans->paths + path, b);
bch2_btree_node_free_inmem(trans, trans->paths + sib_path, m);
bch2_trans_node_add(trans, trans->paths + path, n);
bch2_trans_verify_paths(trans);
six_unlock_intent(&n->c.lock);
bch2_btree_update_done(as, trans);
bch2_time_stats_update(&c->times[BCH_TIME_btree_node_merge], start_time);
out:
err:
if (new_path)
bch2_path_put(trans, new_path, true);
bch2_path_put(trans, sib_path, true);
bch2_trans_verify_locks(trans);
if (ret == -BCH_ERR_journal_reclaim_would_deadlock)
ret = 0;
if (!ret)
ret = bch2_trans_relock(trans);
return ret;
err_free_update:
bch2_btree_node_free_never_used(as, trans, n);
bch2_btree_update_free(as, trans);
goto out;
}
int bch2_btree_node_rewrite(struct btree_trans *trans,
struct btree_iter *iter,
struct btree *b,
unsigned flags)
{
struct bch_fs *c = trans->c;
struct btree *n, *parent;
struct btree_update *as;
btree_path_idx_t new_path = 0;
int ret;
flags |= BCH_TRANS_COMMIT_no_enospc;
struct btree_path *path = btree_iter_path(trans, iter);
parent = btree_node_parent(path, b);
as = bch2_btree_update_start(trans, path, b->c.level, false, flags);
ret = PTR_ERR_OR_ZERO(as);
if (ret)
goto out;
bch2_btree_interior_update_will_free_node(as, b);
n = bch2_btree_node_alloc_replacement(as, trans, b);
bch2_btree_build_aux_trees(n);
bch2_btree_update_add_new_node(as, n);
six_unlock_write(&n->c.lock);
new_path = bch2_path_get_unlocked_mut(trans, iter->btree_id, n->c.level, n->key.k.p);
six_lock_increment(&n->c.lock, SIX_LOCK_intent);
mark_btree_node_locked(trans, trans->paths + new_path, n->c.level, BTREE_NODE_INTENT_LOCKED);
bch2_btree_path_level_init(trans, trans->paths + new_path, n);
trace_and_count(c, btree_node_rewrite, trans, b);
if (parent) {
bch2_keylist_add(&as->parent_keys, &n->key);
ret = bch2_btree_insert_node(as, trans, iter->path, parent, &as->parent_keys);
} else {
ret = bch2_btree_set_root(as, trans, btree_iter_path(trans, iter), n, false);
}
if (ret)
goto err;
bch2_btree_update_get_open_buckets(as, n);
bch2_btree_node_write(c, n, SIX_LOCK_intent, 0);
bch2_btree_node_free_inmem(trans, btree_iter_path(trans, iter), b);
bch2_trans_node_add(trans, trans->paths + iter->path, n);
six_unlock_intent(&n->c.lock);
bch2_btree_update_done(as, trans);
out:
if (new_path)
bch2_path_put(trans, new_path, true);
bch2_trans_downgrade(trans);
return ret;
err:
bch2_btree_node_free_never_used(as, trans, n);
bch2_btree_update_free(as, trans);
goto out;
}
struct async_btree_rewrite {
struct bch_fs *c;
struct work_struct work;
struct list_head list;
enum btree_id btree_id;
unsigned level;
struct bpos pos;
__le64 seq;
};
static int async_btree_node_rewrite_trans(struct btree_trans *trans,
struct async_btree_rewrite *a)
{
struct bch_fs *c = trans->c;
struct btree_iter iter;
struct btree *b;
int ret;
bch2_trans_node_iter_init(trans, &iter, a->btree_id, a->pos,
BTREE_MAX_DEPTH, a->level, 0);
b = bch2_btree_iter_peek_node(&iter);
ret = PTR_ERR_OR_ZERO(b);
if (ret)
goto out;
if (!b || b->data->keys.seq != a->seq) {
struct printbuf buf = PRINTBUF;
if (b)
bch2_bkey_val_to_text(&buf, c, bkey_i_to_s_c(&b->key));
else
prt_str(&buf, "(null");
bch_info(c, "%s: node to rewrite not found:, searching for seq %llu, got\n%s",
__func__, a->seq, buf.buf);
printbuf_exit(&buf);
goto out;
}
ret = bch2_btree_node_rewrite(trans, &iter, b, 0);
out:
bch2_trans_iter_exit(trans, &iter);
return ret;
}
static void async_btree_node_rewrite_work(struct work_struct *work)
{
struct async_btree_rewrite *a =
container_of(work, struct async_btree_rewrite, work);
struct bch_fs *c = a->c;
int ret;
ret = bch2_trans_do(c, NULL, NULL, 0,
async_btree_node_rewrite_trans(trans, a));
bch_err_fn_ratelimited(c, ret);
bch2_write_ref_put(c, BCH_WRITE_REF_node_rewrite);
kfree(a);
}
void bch2_btree_node_rewrite_async(struct bch_fs *c, struct btree *b)
{
struct async_btree_rewrite *a;
int ret;
a = kmalloc(sizeof(*a), GFP_NOFS);
if (!a) {
bch_err(c, "%s: error allocating memory", __func__);
return;
}
a->c = c;
a->btree_id = b->c.btree_id;
a->level = b->c.level;
a->pos = b->key.k.p;
a->seq = b->data->keys.seq;
INIT_WORK(&a->work, async_btree_node_rewrite_work);
if (unlikely(!test_bit(BCH_FS_may_go_rw, &c->flags))) {
mutex_lock(&c->pending_node_rewrites_lock);
list_add(&a->list, &c->pending_node_rewrites);
mutex_unlock(&c->pending_node_rewrites_lock);
return;
}
if (!bch2_write_ref_tryget(c, BCH_WRITE_REF_node_rewrite)) {
if (test_bit(BCH_FS_started, &c->flags)) {
bch_err(c, "%s: error getting c->writes ref", __func__);
kfree(a);
return;
}
ret = bch2_fs_read_write_early(c);
bch_err_msg(c, ret, "going read-write");
if (ret) {
kfree(a);
return;
}
bch2_write_ref_get(c, BCH_WRITE_REF_node_rewrite);
}
queue_work(c->btree_node_rewrite_worker, &a->work);
}
void bch2_do_pending_node_rewrites(struct bch_fs *c)
{
struct async_btree_rewrite *a, *n;
mutex_lock(&c->pending_node_rewrites_lock);
list_for_each_entry_safe(a, n, &c->pending_node_rewrites, list) {
list_del(&a->list);
bch2_write_ref_get(c, BCH_WRITE_REF_node_rewrite);
queue_work(c->btree_node_rewrite_worker, &a->work);
}
mutex_unlock(&c->pending_node_rewrites_lock);
}
void bch2_free_pending_node_rewrites(struct bch_fs *c)
{
struct async_btree_rewrite *a, *n;
mutex_lock(&c->pending_node_rewrites_lock);
list_for_each_entry_safe(a, n, &c->pending_node_rewrites, list) {
list_del(&a->list);
kfree(a);
}
mutex_unlock(&c->pending_node_rewrites_lock);
}
static int __bch2_btree_node_update_key(struct btree_trans *trans,
struct btree_iter *iter,
struct btree *b, struct btree *new_hash,
struct bkey_i *new_key,
unsigned commit_flags,
bool skip_triggers)
{
struct bch_fs *c = trans->c;
struct btree_iter iter2 = { NULL };
struct btree *parent;
int ret;
if (!skip_triggers) {
ret = bch2_key_trigger_old(trans, b->c.btree_id, b->c.level + 1,
bkey_i_to_s_c(&b->key),
BTREE_TRIGGER_transactional) ?:
bch2_key_trigger_new(trans, b->c.btree_id, b->c.level + 1,
bkey_i_to_s(new_key),
BTREE_TRIGGER_transactional);
if (ret)
return ret;
}
if (new_hash) {
bkey_copy(&new_hash->key, new_key);
ret = bch2_btree_node_hash_insert(&c->btree_cache,
new_hash, b->c.level, b->c.btree_id);
BUG_ON(ret);
}
parent = btree_node_parent(btree_iter_path(trans, iter), b);
if (parent) {
bch2_trans_copy_iter(&iter2, iter);
iter2.path = bch2_btree_path_make_mut(trans, iter2.path,
iter2.flags & BTREE_ITER_intent,
_THIS_IP_);
struct btree_path *path2 = btree_iter_path(trans, &iter2);
BUG_ON(path2->level != b->c.level);
BUG_ON(!bpos_eq(path2->pos, new_key->k.p));
btree_path_set_level_up(trans, path2);
trans->paths_sorted = false;
ret = bch2_btree_iter_traverse(&iter2) ?:
bch2_trans_update(trans, &iter2, new_key, BTREE_TRIGGER_norun);
if (ret)
goto err;
} else {
BUG_ON(btree_node_root(c, b) != b);
struct jset_entry *e = bch2_trans_jset_entry_alloc(trans,
jset_u64s(new_key->k.u64s));
ret = PTR_ERR_OR_ZERO(e);
if (ret)
return ret;
journal_entry_set(e,
BCH_JSET_ENTRY_btree_root,
b->c.btree_id, b->c.level,
new_key, new_key->k.u64s);
}
ret = bch2_trans_commit(trans, NULL, NULL, commit_flags);
if (ret)
goto err;
bch2_btree_node_lock_write_nofail(trans, btree_iter_path(trans, iter), &b->c);
if (new_hash) {
mutex_lock(&c->btree_cache.lock);
bch2_btree_node_hash_remove(&c->btree_cache, new_hash);
bch2_btree_node_hash_remove(&c->btree_cache, b);
bkey_copy(&b->key, new_key);
ret = __bch2_btree_node_hash_insert(&c->btree_cache, b);
BUG_ON(ret);
mutex_unlock(&c->btree_cache.lock);
} else {
bkey_copy(&b->key, new_key);
}
bch2_btree_node_unlock_write(trans, btree_iter_path(trans, iter), b);
out:
bch2_trans_iter_exit(trans, &iter2);
return ret;
err:
if (new_hash) {
mutex_lock(&c->btree_cache.lock);
bch2_btree_node_hash_remove(&c->btree_cache, b);
mutex_unlock(&c->btree_cache.lock);
}
goto out;
}
int bch2_btree_node_update_key(struct btree_trans *trans, struct btree_iter *iter,
struct btree *b, struct bkey_i *new_key,
unsigned commit_flags, bool skip_triggers)
{
struct bch_fs *c = trans->c;
struct btree *new_hash = NULL;
struct btree_path *path = btree_iter_path(trans, iter);
struct closure cl;
int ret = 0;
ret = bch2_btree_path_upgrade(trans, path, b->c.level + 1);
if (ret)
return ret;
closure_init_stack(&cl);
/*
* check btree_ptr_hash_val() after @b is locked by
* btree_iter_traverse():
*/
if (btree_ptr_hash_val(new_key) != b->hash_val) {
ret = bch2_btree_cache_cannibalize_lock(trans, &cl);
if (ret) {
ret = drop_locks_do(trans, (closure_sync(&cl), 0));
if (ret)
return ret;
}
new_hash = bch2_btree_node_mem_alloc(trans, false);
ret = PTR_ERR_OR_ZERO(new_hash);
if (ret)
goto err;
}
path->intent_ref++;
ret = __bch2_btree_node_update_key(trans, iter, b, new_hash, new_key,
commit_flags, skip_triggers);
--path->intent_ref;
if (new_hash)
bch2_btree_node_to_freelist(c, new_hash);
err:
closure_sync(&cl);
bch2_btree_cache_cannibalize_unlock(trans);
return ret;
}
int bch2_btree_node_update_key_get_iter(struct btree_trans *trans,
struct btree *b, struct bkey_i *new_key,
unsigned commit_flags, bool skip_triggers)
{
struct btree_iter iter;
int ret;
bch2_trans_node_iter_init(trans, &iter, b->c.btree_id, b->key.k.p,
BTREE_MAX_DEPTH, b->c.level,
BTREE_ITER_intent);
ret = bch2_btree_iter_traverse(&iter);
if (ret)
goto out;
/* has node been freed? */
if (btree_iter_path(trans, &iter)->l[b->c.level].b != b) {
/* node has been freed: */
BUG_ON(!btree_node_dying(b));
goto out;
}
BUG_ON(!btree_node_hashed(b));
bch2_bkey_drop_ptrs(bkey_i_to_s(new_key), ptr,
!bch2_bkey_has_device(bkey_i_to_s(&b->key), ptr->dev));
ret = bch2_btree_node_update_key(trans, &iter, b, new_key,
commit_flags, skip_triggers);
out:
bch2_trans_iter_exit(trans, &iter);
return ret;
}
/* Init code: */
/*
* Only for filesystem bringup, when first reading the btree roots or allocating
* btree roots when initializing a new filesystem:
*/
void bch2_btree_set_root_for_read(struct bch_fs *c, struct btree *b)
{
BUG_ON(btree_node_root(c, b));
bch2_btree_set_root_inmem(c, b);
}
int bch2_btree_root_alloc_fake_trans(struct btree_trans *trans, enum btree_id id, unsigned level)
{
struct bch_fs *c = trans->c;
struct closure cl;
struct btree *b;
int ret;
closure_init_stack(&cl);
do {
ret = bch2_btree_cache_cannibalize_lock(trans, &cl);
closure_sync(&cl);
} while (ret);
b = bch2_btree_node_mem_alloc(trans, false);
bch2_btree_cache_cannibalize_unlock(trans);
ret = PTR_ERR_OR_ZERO(b);
if (ret)
return ret;
set_btree_node_fake(b);
set_btree_node_need_rewrite(b);
b->c.level = level;
b->c.btree_id = id;
bkey_btree_ptr_init(&b->key);
b->key.k.p = SPOS_MAX;
*((u64 *) bkey_i_to_btree_ptr(&b->key)->v.start) = U64_MAX - id;
bch2_bset_init_first(b, &b->data->keys);
bch2_btree_build_aux_trees(b);
b->data->flags = 0;
btree_set_min(b, POS_MIN);
btree_set_max(b, SPOS_MAX);
b->data->format = bch2_btree_calc_format(b);
btree_node_set_format(b, b->data->format);
ret = bch2_btree_node_hash_insert(&c->btree_cache, b,
b->c.level, b->c.btree_id);
BUG_ON(ret);
bch2_btree_set_root_inmem(c, b);
six_unlock_write(&b->c.lock);
six_unlock_intent(&b->c.lock);
return 0;
}
void bch2_btree_root_alloc_fake(struct bch_fs *c, enum btree_id id, unsigned level)
{
bch2_trans_run(c, lockrestart_do(trans, bch2_btree_root_alloc_fake_trans(trans, id, level)));
}
static void bch2_btree_update_to_text(struct printbuf *out, struct btree_update *as)
{
prt_printf(out, "%ps: ", (void *) as->ip_started);
bch2_trans_commit_flags_to_text(out, as->flags);
prt_printf(out, " btree=%s l=%u-%u mode=%s nodes_written=%u cl.remaining=%u journal_seq=%llu\n",
bch2_btree_id_str(as->btree_id),
as->update_level_start,
as->update_level_end,
bch2_btree_update_modes[as->mode],
as->nodes_written,
closure_nr_remaining(&as->cl),
as->journal.seq);
}
void bch2_btree_updates_to_text(struct printbuf *out, struct bch_fs *c)
{
struct btree_update *as;
mutex_lock(&c->btree_interior_update_lock);
list_for_each_entry(as, &c->btree_interior_update_list, list)
bch2_btree_update_to_text(out, as);
mutex_unlock(&c->btree_interior_update_lock);
}
static bool bch2_btree_interior_updates_pending(struct bch_fs *c)
{
bool ret;
mutex_lock(&c->btree_interior_update_lock);
ret = !list_empty(&c->btree_interior_update_list);
mutex_unlock(&c->btree_interior_update_lock);
return ret;
}
bool bch2_btree_interior_updates_flush(struct bch_fs *c)
{
bool ret = bch2_btree_interior_updates_pending(c);
if (ret)
closure_wait_event(&c->btree_interior_update_wait,
!bch2_btree_interior_updates_pending(c));
return ret;
}
void bch2_journal_entry_to_btree_root(struct bch_fs *c, struct jset_entry *entry)
{
struct btree_root *r = bch2_btree_id_root(c, entry->btree_id);
mutex_lock(&c->btree_root_lock);
r->level = entry->level;
r->alive = true;
bkey_copy(&r->key, (struct bkey_i *) entry->start);
mutex_unlock(&c->btree_root_lock);
}
struct jset_entry *
bch2_btree_roots_to_journal_entries(struct bch_fs *c,
struct jset_entry *end,
unsigned long skip)
{
unsigned i;
mutex_lock(&c->btree_root_lock);
for (i = 0; i < btree_id_nr_alive(c); i++) {
struct btree_root *r = bch2_btree_id_root(c, i);
if (r->alive && !test_bit(i, &skip)) {
journal_entry_set(end, BCH_JSET_ENTRY_btree_root,
i, r->level, &r->key, r->key.k.u64s);
end = vstruct_next(end);
}
}
mutex_unlock(&c->btree_root_lock);
return end;
}
static void bch2_btree_alloc_to_text(struct printbuf *out,
struct bch_fs *c,
struct btree_alloc *a)
{
printbuf_indent_add(out, 2);
bch2_bkey_val_to_text(out, c, bkey_i_to_s_c(&a->k));
prt_newline(out);
struct open_bucket *ob;
unsigned i;
open_bucket_for_each(c, &a->ob, ob, i)
bch2_open_bucket_to_text(out, c, ob);
printbuf_indent_sub(out, 2);
}
void bch2_btree_reserve_cache_to_text(struct printbuf *out, struct bch_fs *c)
{
for (unsigned i = 0; i < c->btree_reserve_cache_nr; i++)
bch2_btree_alloc_to_text(out, c, &c->btree_reserve_cache[i]);
}
void bch2_fs_btree_interior_update_exit(struct bch_fs *c)
{
if (c->btree_node_rewrite_worker)
destroy_workqueue(c->btree_node_rewrite_worker);
if (c->btree_interior_update_worker)
destroy_workqueue(c->btree_interior_update_worker);
mempool_exit(&c->btree_interior_update_pool);
}
void bch2_fs_btree_interior_update_init_early(struct bch_fs *c)
{
mutex_init(&c->btree_reserve_cache_lock);
INIT_LIST_HEAD(&c->btree_interior_update_list);
INIT_LIST_HEAD(&c->btree_interior_updates_unwritten);
mutex_init(&c->btree_interior_update_lock);
INIT_WORK(&c->btree_interior_update_work, btree_interior_update_work);
INIT_LIST_HEAD(&c->pending_node_rewrites);
mutex_init(&c->pending_node_rewrites_lock);
}
int bch2_fs_btree_interior_update_init(struct bch_fs *c)
{
c->btree_interior_update_worker =
alloc_workqueue("btree_update", WQ_UNBOUND|WQ_MEM_RECLAIM, 8);
if (!c->btree_interior_update_worker)
return -BCH_ERR_ENOMEM_btree_interior_update_worker_init;
c->btree_node_rewrite_worker =
alloc_ordered_workqueue("btree_node_rewrite", WQ_UNBOUND);
if (!c->btree_node_rewrite_worker)
return -BCH_ERR_ENOMEM_btree_interior_update_worker_init;
if (mempool_init_kmalloc_pool(&c->btree_interior_update_pool, 1,
sizeof(struct btree_update)))
return -BCH_ERR_ENOMEM_btree_interior_update_pool_init;
return 0;
}
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