linux/fs/bcachefs/btree_trans_commit.c
Kent Overstreet 006ccc3090 bcachefs: Kill journal pre-reservations
This deletes the complicated and somewhat expensive journal
pre-reservation machinery in favor of just using journal watermarks:
when the journal is more than half full, we run journal reclaim more
aggressively, and when the journal is more than 3/4s full we only allow
journal reclaim to get new journal reservations.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
2023-11-14 23:44:43 -05:00

1163 lines
30 KiB
C

// SPDX-License-Identifier: GPL-2.0
#include "bcachefs.h"
#include "btree_gc.h"
#include "btree_io.h"
#include "btree_iter.h"
#include "btree_journal_iter.h"
#include "btree_key_cache.h"
#include "btree_update_interior.h"
#include "btree_write_buffer.h"
#include "buckets.h"
#include "errcode.h"
#include "error.h"
#include "journal.h"
#include "journal_reclaim.h"
#include "replicas.h"
#include "snapshot.h"
#include <linux/prefetch.h>
static void verify_update_old_key(struct btree_trans *trans, struct btree_insert_entry *i)
{
#ifdef CONFIG_BCACHEFS_DEBUG
struct bch_fs *c = trans->c;
struct bkey u;
struct bkey_s_c k = bch2_btree_path_peek_slot_exact(i->path, &u);
if (unlikely(trans->journal_replay_not_finished)) {
struct bkey_i *j_k =
bch2_journal_keys_peek_slot(c, i->btree_id, i->level, i->k->k.p);
if (j_k)
k = bkey_i_to_s_c(j_k);
}
u = *k.k;
u.needs_whiteout = i->old_k.needs_whiteout;
BUG_ON(memcmp(&i->old_k, &u, sizeof(struct bkey)));
BUG_ON(i->old_v != k.v);
#endif
}
static inline struct btree_path_level *insert_l(struct btree_insert_entry *i)
{
return i->path->l + i->level;
}
static inline bool same_leaf_as_prev(struct btree_trans *trans,
struct btree_insert_entry *i)
{
return i != trans->updates &&
insert_l(&i[0])->b == insert_l(&i[-1])->b;
}
static inline bool same_leaf_as_next(struct btree_trans *trans,
struct btree_insert_entry *i)
{
return i + 1 < trans->updates + trans->nr_updates &&
insert_l(&i[0])->b == insert_l(&i[1])->b;
}
inline void bch2_btree_node_prep_for_write(struct btree_trans *trans,
struct btree_path *path,
struct btree *b)
{
struct bch_fs *c = trans->c;
if (unlikely(btree_node_just_written(b)) &&
bch2_btree_post_write_cleanup(c, b))
bch2_trans_node_reinit_iter(trans, b);
/*
* If the last bset has been written, or if it's gotten too big - start
* a new bset to insert into:
*/
if (want_new_bset(c, b))
bch2_btree_init_next(trans, b);
}
static noinline int trans_lock_write_fail(struct btree_trans *trans, struct btree_insert_entry *i)
{
while (--i >= trans->updates) {
if (same_leaf_as_prev(trans, i))
continue;
bch2_btree_node_unlock_write(trans, i->path, insert_l(i)->b);
}
trace_and_count(trans->c, trans_restart_would_deadlock_write, trans);
return btree_trans_restart(trans, BCH_ERR_transaction_restart_would_deadlock_write);
}
static inline int bch2_trans_lock_write(struct btree_trans *trans)
{
struct btree_insert_entry *i;
EBUG_ON(trans->write_locked);
trans_for_each_update(trans, i) {
if (same_leaf_as_prev(trans, i))
continue;
if (bch2_btree_node_lock_write(trans, i->path, &insert_l(i)->b->c))
return trans_lock_write_fail(trans, i);
if (!i->cached)
bch2_btree_node_prep_for_write(trans, i->path, insert_l(i)->b);
}
trans->write_locked = true;
return 0;
}
static inline void bch2_trans_unlock_write(struct btree_trans *trans)
{
if (likely(trans->write_locked)) {
struct btree_insert_entry *i;
trans_for_each_update(trans, i)
if (!same_leaf_as_prev(trans, i))
bch2_btree_node_unlock_write_inlined(trans, i->path,
insert_l(i)->b);
trans->write_locked = false;
}
}
/* Inserting into a given leaf node (last stage of insert): */
/* Handle overwrites and do insert, for non extents: */
bool bch2_btree_bset_insert_key(struct btree_trans *trans,
struct btree_path *path,
struct btree *b,
struct btree_node_iter *node_iter,
struct bkey_i *insert)
{
struct bkey_packed *k;
unsigned clobber_u64s = 0, new_u64s = 0;
EBUG_ON(btree_node_just_written(b));
EBUG_ON(bset_written(b, btree_bset_last(b)));
EBUG_ON(bkey_deleted(&insert->k) && bkey_val_u64s(&insert->k));
EBUG_ON(bpos_lt(insert->k.p, b->data->min_key));
EBUG_ON(bpos_gt(insert->k.p, b->data->max_key));
EBUG_ON(insert->k.u64s >
bch_btree_keys_u64s_remaining(trans->c, b));
EBUG_ON(!b->c.level && !bpos_eq(insert->k.p, path->pos));
k = bch2_btree_node_iter_peek_all(node_iter, b);
if (k && bkey_cmp_left_packed(b, k, &insert->k.p))
k = NULL;
/* @k is the key being overwritten/deleted, if any: */
EBUG_ON(k && bkey_deleted(k));
/* Deleting, but not found? nothing to do: */
if (bkey_deleted(&insert->k) && !k)
return false;
if (bkey_deleted(&insert->k)) {
/* Deleting: */
btree_account_key_drop(b, k);
k->type = KEY_TYPE_deleted;
if (k->needs_whiteout)
push_whiteout(trans->c, b, insert->k.p);
k->needs_whiteout = false;
if (k >= btree_bset_last(b)->start) {
clobber_u64s = k->u64s;
bch2_bset_delete(b, k, clobber_u64s);
goto fix_iter;
} else {
bch2_btree_path_fix_key_modified(trans, b, k);
}
return true;
}
if (k) {
/* Overwriting: */
btree_account_key_drop(b, k);
k->type = KEY_TYPE_deleted;
insert->k.needs_whiteout = k->needs_whiteout;
k->needs_whiteout = false;
if (k >= btree_bset_last(b)->start) {
clobber_u64s = k->u64s;
goto overwrite;
} else {
bch2_btree_path_fix_key_modified(trans, b, k);
}
}
k = bch2_btree_node_iter_bset_pos(node_iter, b, bset_tree_last(b));
overwrite:
bch2_bset_insert(b, node_iter, k, insert, clobber_u64s);
new_u64s = k->u64s;
fix_iter:
if (clobber_u64s != new_u64s)
bch2_btree_node_iter_fix(trans, path, b, node_iter, k,
clobber_u64s, new_u64s);
return true;
}
static int __btree_node_flush(struct journal *j, struct journal_entry_pin *pin,
unsigned i, u64 seq)
{
struct bch_fs *c = container_of(j, struct bch_fs, journal);
struct btree_write *w = container_of(pin, struct btree_write, journal);
struct btree *b = container_of(w, struct btree, writes[i]);
struct btree_trans *trans = bch2_trans_get(c);
unsigned long old, new, v;
unsigned idx = w - b->writes;
btree_node_lock_nopath_nofail(trans, &b->c, SIX_LOCK_read);
v = READ_ONCE(b->flags);
do {
old = new = v;
if (!(old & (1 << BTREE_NODE_dirty)) ||
!!(old & (1 << BTREE_NODE_write_idx)) != idx ||
w->journal.seq != seq)
break;
new &= ~BTREE_WRITE_TYPE_MASK;
new |= BTREE_WRITE_journal_reclaim;
new |= 1 << BTREE_NODE_need_write;
} while ((v = cmpxchg(&b->flags, old, new)) != old);
btree_node_write_if_need(c, b, SIX_LOCK_read);
six_unlock_read(&b->c.lock);
bch2_trans_put(trans);
return 0;
}
int bch2_btree_node_flush0(struct journal *j, struct journal_entry_pin *pin, u64 seq)
{
return __btree_node_flush(j, pin, 0, seq);
}
int bch2_btree_node_flush1(struct journal *j, struct journal_entry_pin *pin, u64 seq)
{
return __btree_node_flush(j, pin, 1, seq);
}
inline void bch2_btree_add_journal_pin(struct bch_fs *c,
struct btree *b, u64 seq)
{
struct btree_write *w = btree_current_write(b);
bch2_journal_pin_add(&c->journal, seq, &w->journal,
btree_node_write_idx(b) == 0
? bch2_btree_node_flush0
: bch2_btree_node_flush1);
}
/**
* bch2_btree_insert_key_leaf() - insert a key one key into a leaf node
* @trans: btree transaction object
* @path: path pointing to @insert's pos
* @insert: key to insert
* @journal_seq: sequence number of journal reservation
*/
inline void bch2_btree_insert_key_leaf(struct btree_trans *trans,
struct btree_path *path,
struct bkey_i *insert,
u64 journal_seq)
{
struct bch_fs *c = trans->c;
struct btree *b = path_l(path)->b;
struct bset_tree *t = bset_tree_last(b);
struct bset *i = bset(b, t);
int old_u64s = bset_u64s(t);
int old_live_u64s = b->nr.live_u64s;
int live_u64s_added, u64s_added;
if (unlikely(!bch2_btree_bset_insert_key(trans, path, b,
&path_l(path)->iter, insert)))
return;
i->journal_seq = cpu_to_le64(max(journal_seq, le64_to_cpu(i->journal_seq)));
bch2_btree_add_journal_pin(c, b, journal_seq);
if (unlikely(!btree_node_dirty(b))) {
EBUG_ON(test_bit(BCH_FS_CLEAN_SHUTDOWN, &c->flags));
set_btree_node_dirty_acct(c, b);
}
live_u64s_added = (int) b->nr.live_u64s - old_live_u64s;
u64s_added = (int) bset_u64s(t) - 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);
}
/* Cached btree updates: */
/* Normal update interface: */
static inline void btree_insert_entry_checks(struct btree_trans *trans,
struct btree_insert_entry *i)
{
BUG_ON(!bpos_eq(i->k->k.p, i->path->pos));
BUG_ON(i->cached != i->path->cached);
BUG_ON(i->level != i->path->level);
BUG_ON(i->btree_id != i->path->btree_id);
EBUG_ON(!i->level &&
btree_type_has_snapshots(i->btree_id) &&
!(i->flags & BTREE_UPDATE_INTERNAL_SNAPSHOT_NODE) &&
test_bit(JOURNAL_REPLAY_DONE, &trans->c->journal.flags) &&
i->k->k.p.snapshot &&
bch2_snapshot_is_internal_node(trans->c, i->k->k.p.snapshot));
}
static __always_inline int bch2_trans_journal_res_get(struct btree_trans *trans,
unsigned flags)
{
return bch2_journal_res_get(&trans->c->journal, &trans->journal_res,
trans->journal_u64s, flags);
}
#define JSET_ENTRY_LOG_U64s 4
static noinline void journal_transaction_name(struct btree_trans *trans)
{
struct bch_fs *c = trans->c;
struct journal *j = &c->journal;
struct jset_entry *entry =
bch2_journal_add_entry(j, &trans->journal_res,
BCH_JSET_ENTRY_log, 0, 0,
JSET_ENTRY_LOG_U64s);
struct jset_entry_log *l =
container_of(entry, struct jset_entry_log, entry);
strncpy(l->d, trans->fn, JSET_ENTRY_LOG_U64s * sizeof(u64));
}
static inline int btree_key_can_insert(struct btree_trans *trans,
struct btree *b, unsigned u64s)
{
struct bch_fs *c = trans->c;
if (!bch2_btree_node_insert_fits(c, b, u64s))
return -BCH_ERR_btree_insert_btree_node_full;
return 0;
}
noinline static int
btree_key_can_insert_cached_slowpath(struct btree_trans *trans, unsigned flags,
struct btree_path *path, unsigned new_u64s)
{
struct bch_fs *c = trans->c;
struct btree_insert_entry *i;
struct bkey_cached *ck = (void *) path->l[0].b;
struct bkey_i *new_k;
int ret;
bch2_trans_unlock_write(trans);
bch2_trans_unlock(trans);
new_k = kmalloc(new_u64s * sizeof(u64), GFP_KERNEL);
if (!new_k) {
bch_err(c, "error allocating memory for key cache key, btree %s u64s %u",
bch2_btree_id_str(path->btree_id), new_u64s);
return -BCH_ERR_ENOMEM_btree_key_cache_insert;
}
ret = bch2_trans_relock(trans) ?:
bch2_trans_lock_write(trans);
if (unlikely(ret)) {
kfree(new_k);
return ret;
}
memcpy(new_k, ck->k, ck->u64s * sizeof(u64));
trans_for_each_update(trans, i)
if (i->old_v == &ck->k->v)
i->old_v = &new_k->v;
kfree(ck->k);
ck->u64s = new_u64s;
ck->k = new_k;
return 0;
}
static int btree_key_can_insert_cached(struct btree_trans *trans, unsigned flags,
struct btree_path *path, unsigned u64s)
{
struct bch_fs *c = trans->c;
struct bkey_cached *ck = (void *) path->l[0].b;
struct btree_insert_entry *i;
unsigned new_u64s;
struct bkey_i *new_k;
EBUG_ON(path->level);
if (!test_bit(BKEY_CACHED_DIRTY, &ck->flags) &&
bch2_btree_key_cache_must_wait(c) &&
!(flags & BTREE_INSERT_JOURNAL_RECLAIM))
return -BCH_ERR_btree_insert_need_journal_reclaim;
/*
* bch2_varint_decode can read past the end of the buffer by at most 7
* bytes (it won't be used):
*/
u64s += 1;
if (u64s <= ck->u64s)
return 0;
new_u64s = roundup_pow_of_two(u64s);
new_k = krealloc(ck->k, new_u64s * sizeof(u64), GFP_NOWAIT);
if (unlikely(!new_k))
return btree_key_can_insert_cached_slowpath(trans, flags, path, new_u64s);
trans_for_each_update(trans, i)
if (i->old_v == &ck->k->v)
i->old_v = &new_k->v;
ck->u64s = new_u64s;
ck->k = new_k;
return 0;
}
/* Triggers: */
static int run_one_mem_trigger(struct btree_trans *trans,
struct btree_insert_entry *i,
unsigned flags)
{
struct bkey_s_c old = { &i->old_k, i->old_v };
struct bkey_i *new = i->k;
const struct bkey_ops *old_ops = bch2_bkey_type_ops(old.k->type);
const struct bkey_ops *new_ops = bch2_bkey_type_ops(i->k->k.type);
int ret;
verify_update_old_key(trans, i);
if (unlikely(flags & BTREE_TRIGGER_NORUN))
return 0;
if (!btree_node_type_needs_gc(__btree_node_type(i->level, i->btree_id)))
return 0;
if (old_ops->atomic_trigger == new_ops->atomic_trigger) {
ret = bch2_mark_key(trans, i->btree_id, i->level,
old, bkey_i_to_s_c(new),
BTREE_TRIGGER_INSERT|BTREE_TRIGGER_OVERWRITE|flags);
} else {
struct bkey _deleted = KEY(0, 0, 0);
struct bkey_s_c deleted = (struct bkey_s_c) { &_deleted, NULL };
_deleted.p = i->path->pos;
ret = bch2_mark_key(trans, i->btree_id, i->level,
deleted, bkey_i_to_s_c(new),
BTREE_TRIGGER_INSERT|flags) ?:
bch2_mark_key(trans, i->btree_id, i->level,
old, deleted,
BTREE_TRIGGER_OVERWRITE|flags);
}
return ret;
}
static int run_one_trans_trigger(struct btree_trans *trans, struct btree_insert_entry *i,
bool overwrite)
{
/*
* Transactional triggers create new btree_insert_entries, so we can't
* pass them a pointer to a btree_insert_entry, that memory is going to
* move:
*/
struct bkey old_k = i->old_k;
struct bkey_s_c old = { &old_k, i->old_v };
const struct bkey_ops *old_ops = bch2_bkey_type_ops(old.k->type);
const struct bkey_ops *new_ops = bch2_bkey_type_ops(i->k->k.type);
verify_update_old_key(trans, i);
if ((i->flags & BTREE_TRIGGER_NORUN) ||
!(BTREE_NODE_TYPE_HAS_TRANS_TRIGGERS & (1U << i->bkey_type)))
return 0;
if (!i->insert_trigger_run &&
!i->overwrite_trigger_run &&
old_ops->trans_trigger == new_ops->trans_trigger) {
i->overwrite_trigger_run = true;
i->insert_trigger_run = true;
return bch2_trans_mark_key(trans, i->btree_id, i->level, old, i->k,
BTREE_TRIGGER_INSERT|
BTREE_TRIGGER_OVERWRITE|
i->flags) ?: 1;
} else if (overwrite && !i->overwrite_trigger_run) {
i->overwrite_trigger_run = true;
return bch2_trans_mark_old(trans, i->btree_id, i->level, old, i->flags) ?: 1;
} else if (!overwrite && !i->insert_trigger_run) {
i->insert_trigger_run = true;
return bch2_trans_mark_new(trans, i->btree_id, i->level, i->k, i->flags) ?: 1;
} else {
return 0;
}
}
static int run_btree_triggers(struct btree_trans *trans, enum btree_id btree_id,
struct btree_insert_entry *btree_id_start)
{
struct btree_insert_entry *i;
bool trans_trigger_run;
int ret, overwrite;
for (overwrite = 1; overwrite >= 0; --overwrite) {
/*
* Running triggers will append more updates to the list of updates as
* we're walking it:
*/
do {
trans_trigger_run = false;
for (i = btree_id_start;
i < trans->updates + trans->nr_updates && i->btree_id <= btree_id;
i++) {
if (i->btree_id != btree_id)
continue;
ret = run_one_trans_trigger(trans, i, overwrite);
if (ret < 0)
return ret;
if (ret)
trans_trigger_run = true;
}
} while (trans_trigger_run);
}
return 0;
}
static int bch2_trans_commit_run_triggers(struct btree_trans *trans)
{
struct btree_insert_entry *i = NULL, *btree_id_start = trans->updates;
unsigned btree_id = 0;
int ret = 0;
/*
*
* For a given btree, this algorithm runs insert triggers before
* overwrite triggers: this is so that when extents are being moved
* (e.g. by FALLOCATE_FL_INSERT_RANGE), we don't drop references before
* they are re-added.
*/
for (btree_id = 0; btree_id < BTREE_ID_NR; btree_id++) {
if (btree_id == BTREE_ID_alloc)
continue;
while (btree_id_start < trans->updates + trans->nr_updates &&
btree_id_start->btree_id < btree_id)
btree_id_start++;
ret = run_btree_triggers(trans, btree_id, btree_id_start);
if (ret)
return ret;
}
trans_for_each_update(trans, i) {
if (i->btree_id > BTREE_ID_alloc)
break;
if (i->btree_id == BTREE_ID_alloc) {
ret = run_btree_triggers(trans, BTREE_ID_alloc, i);
if (ret)
return ret;
break;
}
}
#ifdef CONFIG_BCACHEFS_DEBUG
trans_for_each_update(trans, i)
BUG_ON(!(i->flags & BTREE_TRIGGER_NORUN) &&
(BTREE_NODE_TYPE_HAS_TRANS_TRIGGERS & (1U << i->bkey_type)) &&
(!i->insert_trigger_run || !i->overwrite_trigger_run));
#endif
return 0;
}
static noinline int bch2_trans_commit_run_gc_triggers(struct btree_trans *trans)
{
struct bch_fs *c = trans->c;
struct btree_insert_entry *i;
int ret = 0;
trans_for_each_update(trans, i) {
/*
* XXX: synchronization of cached update triggers with gc
* XXX: synchronization of interior node updates with gc
*/
BUG_ON(i->cached || i->level);
if (gc_visited(c, gc_pos_btree_node(insert_l(i)->b))) {
ret = run_one_mem_trigger(trans, i, i->flags|BTREE_TRIGGER_GC);
if (ret)
break;
}
}
return ret;
}
static inline int
bch2_trans_commit_write_locked(struct btree_trans *trans, unsigned flags,
struct btree_insert_entry **stopped_at,
unsigned long trace_ip)
{
struct bch_fs *c = trans->c;
struct btree_insert_entry *i;
struct btree_write_buffered_key *wb;
struct btree_trans_commit_hook *h;
unsigned u64s = 0;
int ret;
if (race_fault()) {
trace_and_count(c, trans_restart_fault_inject, trans, trace_ip);
return btree_trans_restart_nounlock(trans, BCH_ERR_transaction_restart_fault_inject);
}
/*
* Check if the insert will fit in the leaf node with the write lock
* held, otherwise another thread could write the node changing the
* amount of space available:
*/
prefetch(&trans->c->journal.flags);
trans_for_each_update(trans, i) {
/* Multiple inserts might go to same leaf: */
if (!same_leaf_as_prev(trans, i))
u64s = 0;
u64s += i->k->k.u64s;
ret = !i->cached
? btree_key_can_insert(trans, insert_l(i)->b, u64s)
: btree_key_can_insert_cached(trans, flags, i->path, u64s);
if (ret) {
*stopped_at = i;
return ret;
}
}
if (trans->nr_wb_updates &&
trans->nr_wb_updates + c->btree_write_buffer.state.nr > c->btree_write_buffer.size)
return -BCH_ERR_btree_insert_need_flush_buffer;
/*
* Don't get journal reservation until after we know insert will
* succeed:
*/
if (likely(!(flags & BTREE_INSERT_JOURNAL_REPLAY))) {
ret = bch2_trans_journal_res_get(trans,
(flags & BCH_WATERMARK_MASK)|
JOURNAL_RES_GET_NONBLOCK);
if (ret)
return ret;
if (unlikely(trans->journal_transaction_names))
journal_transaction_name(trans);
} else {
trans->journal_res.seq = c->journal.replay_journal_seq;
}
/*
* Not allowed to fail after we've gotten our journal reservation - we
* have to use it:
*/
if (IS_ENABLED(CONFIG_BCACHEFS_DEBUG) &&
!(flags & BTREE_INSERT_JOURNAL_REPLAY)) {
if (bch2_journal_seq_verify)
trans_for_each_update(trans, i)
i->k->k.version.lo = trans->journal_res.seq;
else if (bch2_inject_invalid_keys)
trans_for_each_update(trans, i)
i->k->k.version = MAX_VERSION;
}
if (trans->fs_usage_deltas &&
bch2_trans_fs_usage_apply(trans, trans->fs_usage_deltas))
return -BCH_ERR_btree_insert_need_mark_replicas;
if (trans->nr_wb_updates) {
EBUG_ON(flags & BTREE_INSERT_JOURNAL_REPLAY);
ret = bch2_btree_insert_keys_write_buffer(trans);
if (ret)
goto revert_fs_usage;
}
h = trans->hooks;
while (h) {
ret = h->fn(trans, h);
if (ret)
goto revert_fs_usage;
h = h->next;
}
trans_for_each_update(trans, i)
if (BTREE_NODE_TYPE_HAS_MEM_TRIGGERS & (1U << i->bkey_type)) {
ret = run_one_mem_trigger(trans, i, i->flags);
if (ret)
goto fatal_err;
}
if (unlikely(c->gc_pos.phase)) {
ret = bch2_trans_commit_run_gc_triggers(trans);
if (ret)
goto fatal_err;
}
if (unlikely(trans->extra_journal_entries.nr)) {
memcpy_u64s_small(journal_res_entry(&c->journal, &trans->journal_res),
trans->extra_journal_entries.data,
trans->extra_journal_entries.nr);
trans->journal_res.offset += trans->extra_journal_entries.nr;
trans->journal_res.u64s -= trans->extra_journal_entries.nr;
}
if (likely(!(flags & BTREE_INSERT_JOURNAL_REPLAY))) {
struct journal *j = &c->journal;
struct jset_entry *entry;
trans_for_each_update(trans, i) {
if (i->key_cache_already_flushed)
continue;
if (i->flags & BTREE_UPDATE_NOJOURNAL)
continue;
verify_update_old_key(trans, i);
if (trans->journal_transaction_names) {
entry = bch2_journal_add_entry(j, &trans->journal_res,
BCH_JSET_ENTRY_overwrite,
i->btree_id, i->level,
i->old_k.u64s);
bkey_reassemble((struct bkey_i *) entry->start,
(struct bkey_s_c) { &i->old_k, i->old_v });
}
entry = bch2_journal_add_entry(j, &trans->journal_res,
BCH_JSET_ENTRY_btree_keys,
i->btree_id, i->level,
i->k->k.u64s);
bkey_copy((struct bkey_i *) entry->start, i->k);
}
trans_for_each_wb_update(trans, wb) {
entry = bch2_journal_add_entry(j, &trans->journal_res,
BCH_JSET_ENTRY_btree_keys,
wb->btree, 0,
wb->k.k.u64s);
bkey_copy((struct bkey_i *) entry->start, &wb->k);
}
if (trans->journal_seq)
*trans->journal_seq = trans->journal_res.seq;
}
trans_for_each_update(trans, i) {
i->k->k.needs_whiteout = false;
if (!i->cached) {
u64 seq = trans->journal_res.seq;
if (i->flags & BTREE_UPDATE_PREJOURNAL)
seq = i->seq;
bch2_btree_insert_key_leaf(trans, i->path, i->k, seq);
} else if (!i->key_cache_already_flushed)
bch2_btree_insert_key_cached(trans, flags, i);
else {
bch2_btree_key_cache_drop(trans, i->path);
btree_path_set_dirty(i->path, BTREE_ITER_NEED_TRAVERSE);
}
}
return 0;
fatal_err:
bch2_fatal_error(c);
revert_fs_usage:
if (trans->fs_usage_deltas)
bch2_trans_fs_usage_revert(trans, trans->fs_usage_deltas);
return ret;
}
static noinline void bch2_drop_overwrites_from_journal(struct btree_trans *trans)
{
struct btree_insert_entry *i;
struct btree_write_buffered_key *wb;
trans_for_each_update(trans, i)
bch2_journal_key_overwritten(trans->c, i->btree_id, i->level, i->k->k.p);
trans_for_each_wb_update(trans, wb)
bch2_journal_key_overwritten(trans->c, wb->btree, 0, wb->k.k.p);
}
static noinline int bch2_trans_commit_bkey_invalid(struct btree_trans *trans,
enum bkey_invalid_flags flags,
struct btree_insert_entry *i,
struct printbuf *err)
{
struct bch_fs *c = trans->c;
printbuf_reset(err);
prt_printf(err, "invalid bkey on insert from %s -> %ps",
trans->fn, (void *) i->ip_allocated);
prt_newline(err);
printbuf_indent_add(err, 2);
bch2_bkey_val_to_text(err, c, bkey_i_to_s_c(i->k));
prt_newline(err);
bch2_bkey_invalid(c, bkey_i_to_s_c(i->k), i->bkey_type, flags, err);
bch2_print_string_as_lines(KERN_ERR, err->buf);
bch2_inconsistent_error(c);
bch2_dump_trans_updates(trans);
return -EINVAL;
}
/*
* Get journal reservation, take write locks, and attempt to do btree update(s):
*/
static inline int do_bch2_trans_commit(struct btree_trans *trans, unsigned flags,
struct btree_insert_entry **stopped_at,
unsigned long trace_ip)
{
struct bch_fs *c = trans->c;
struct btree_insert_entry *i;
int ret = 0, u64s_delta = 0;
trans_for_each_update(trans, i) {
if (i->cached)
continue;
u64s_delta += !bkey_deleted(&i->k->k) ? i->k->k.u64s : 0;
u64s_delta -= i->old_btree_u64s;
if (!same_leaf_as_next(trans, i)) {
if (u64s_delta <= 0) {
ret = bch2_foreground_maybe_merge(trans, i->path,
i->level, flags);
if (unlikely(ret))
return ret;
}
u64s_delta = 0;
}
}
ret = bch2_trans_lock_write(trans);
if (unlikely(ret))
return ret;
ret = bch2_trans_commit_write_locked(trans, flags, stopped_at, trace_ip);
if (!ret && unlikely(trans->journal_replay_not_finished))
bch2_drop_overwrites_from_journal(trans);
bch2_trans_unlock_write(trans);
if (!ret && trans->journal_pin)
bch2_journal_pin_add(&c->journal, trans->journal_res.seq,
trans->journal_pin, NULL);
/*
* Drop journal reservation after dropping write locks, since dropping
* the journal reservation may kick off a journal write:
*/
bch2_journal_res_put(&c->journal, &trans->journal_res);
return ret;
}
static int journal_reclaim_wait_done(struct bch_fs *c)
{
int ret = bch2_journal_error(&c->journal) ?:
!bch2_btree_key_cache_must_wait(c);
if (!ret)
journal_reclaim_kick(&c->journal);
return ret;
}
static noinline
int bch2_trans_commit_error(struct btree_trans *trans, unsigned flags,
struct btree_insert_entry *i,
int ret, unsigned long trace_ip)
{
struct bch_fs *c = trans->c;
switch (ret) {
case -BCH_ERR_btree_insert_btree_node_full:
ret = bch2_btree_split_leaf(trans, i->path, flags);
if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
trace_and_count(c, trans_restart_btree_node_split, trans, trace_ip, i->path);
break;
case -BCH_ERR_btree_insert_need_mark_replicas:
ret = drop_locks_do(trans,
bch2_replicas_delta_list_mark(c, trans->fs_usage_deltas));
break;
case -BCH_ERR_journal_res_get_blocked:
/*
* XXX: this should probably be a separate BTREE_INSERT_NONBLOCK
* flag
*/
if ((flags & BTREE_INSERT_JOURNAL_RECLAIM) &&
(flags & BCH_WATERMARK_MASK) != BCH_WATERMARK_reclaim) {
ret = -BCH_ERR_journal_reclaim_would_deadlock;
break;
}
ret = drop_locks_do(trans,
bch2_trans_journal_res_get(trans,
(flags & BCH_WATERMARK_MASK)|
JOURNAL_RES_GET_CHECK));
break;
case -BCH_ERR_btree_insert_need_journal_reclaim:
bch2_trans_unlock(trans);
trace_and_count(c, trans_blocked_journal_reclaim, trans, trace_ip);
wait_event_freezable(c->journal.reclaim_wait,
(ret = journal_reclaim_wait_done(c)));
if (ret < 0)
break;
ret = bch2_trans_relock(trans);
break;
case -BCH_ERR_btree_insert_need_flush_buffer: {
struct btree_write_buffer *wb = &c->btree_write_buffer;
ret = 0;
if (wb->state.nr > wb->size * 3 / 4) {
bch2_trans_unlock(trans);
mutex_lock(&wb->flush_lock);
if (wb->state.nr > wb->size * 3 / 4) {
bch2_trans_begin(trans);
ret = __bch2_btree_write_buffer_flush(trans,
flags|BTREE_INSERT_NOCHECK_RW, true);
if (!ret) {
trace_and_count(c, trans_restart_write_buffer_flush, trans, _THIS_IP_);
ret = btree_trans_restart(trans, BCH_ERR_transaction_restart_write_buffer_flush);
}
} else {
mutex_unlock(&wb->flush_lock);
ret = bch2_trans_relock(trans);
}
}
break;
}
default:
BUG_ON(ret >= 0);
break;
}
BUG_ON(bch2_err_matches(ret, BCH_ERR_transaction_restart) != !!trans->restarted);
bch2_fs_inconsistent_on(bch2_err_matches(ret, ENOSPC) &&
!(flags & BTREE_INSERT_NOWAIT) &&
(flags & BTREE_INSERT_NOFAIL), c,
"%s: incorrectly got %s\n", __func__, bch2_err_str(ret));
return ret;
}
static noinline int
bch2_trans_commit_get_rw_cold(struct btree_trans *trans, unsigned flags)
{
struct bch_fs *c = trans->c;
int ret;
if (likely(!(flags & BTREE_INSERT_LAZY_RW)) ||
test_bit(BCH_FS_STARTED, &c->flags))
return -BCH_ERR_erofs_trans_commit;
ret = drop_locks_do(trans, bch2_fs_read_write_early(c));
if (ret)
return ret;
bch2_write_ref_get(c, BCH_WRITE_REF_trans);
return 0;
}
/*
* This is for updates done in the early part of fsck - btree_gc - before we've
* gone RW. we only add the new key to the list of keys for journal replay to
* do.
*/
static noinline int
do_bch2_trans_commit_to_journal_replay(struct btree_trans *trans)
{
struct bch_fs *c = trans->c;
struct btree_insert_entry *i;
int ret = 0;
trans_for_each_update(trans, i) {
ret = bch2_journal_key_insert(c, i->btree_id, i->level, i->k);
if (ret)
break;
}
return ret;
}
int __bch2_trans_commit(struct btree_trans *trans, unsigned flags)
{
struct bch_fs *c = trans->c;
struct btree_insert_entry *i = NULL;
struct btree_write_buffered_key *wb;
int ret = 0;
if (!trans->nr_updates &&
!trans->nr_wb_updates &&
!trans->extra_journal_entries.nr)
goto out_reset;
if (flags & BTREE_INSERT_GC_LOCK_HELD)
lockdep_assert_held(&c->gc_lock);
ret = bch2_trans_commit_run_triggers(trans);
if (ret)
goto out_reset;
trans_for_each_update(trans, i) {
struct printbuf buf = PRINTBUF;
enum bkey_invalid_flags invalid_flags = 0;
if (!(flags & BTREE_INSERT_JOURNAL_REPLAY))
invalid_flags |= BKEY_INVALID_WRITE|BKEY_INVALID_COMMIT;
if (unlikely(bch2_bkey_invalid(c, bkey_i_to_s_c(i->k),
i->bkey_type, invalid_flags, &buf)))
ret = bch2_trans_commit_bkey_invalid(trans, invalid_flags, i, &buf);
btree_insert_entry_checks(trans, i);
printbuf_exit(&buf);
if (ret)
return ret;
}
if (unlikely(!test_bit(BCH_FS_MAY_GO_RW, &c->flags))) {
ret = do_bch2_trans_commit_to_journal_replay(trans);
goto out_reset;
}
if (!(flags & BTREE_INSERT_NOCHECK_RW) &&
unlikely(!bch2_write_ref_tryget(c, BCH_WRITE_REF_trans))) {
ret = bch2_trans_commit_get_rw_cold(trans, flags);
if (ret)
goto out_reset;
}
if (c->btree_write_buffer.state.nr > c->btree_write_buffer.size / 2 &&
mutex_trylock(&c->btree_write_buffer.flush_lock)) {
bch2_trans_begin(trans);
bch2_trans_unlock(trans);
ret = __bch2_btree_write_buffer_flush(trans,
flags|BTREE_INSERT_NOCHECK_RW, true);
if (!ret) {
trace_and_count(c, trans_restart_write_buffer_flush, trans, _THIS_IP_);
ret = btree_trans_restart(trans, BCH_ERR_transaction_restart_write_buffer_flush);
}
goto out;
}
EBUG_ON(test_bit(BCH_FS_CLEAN_SHUTDOWN, &c->flags));
trans->journal_u64s = trans->extra_journal_entries.nr;
trans->journal_transaction_names = READ_ONCE(c->opts.journal_transaction_names);
if (trans->journal_transaction_names)
trans->journal_u64s += jset_u64s(JSET_ENTRY_LOG_U64s);
trans_for_each_update(trans, i) {
EBUG_ON(!i->path->should_be_locked);
ret = bch2_btree_path_upgrade(trans, i->path, i->level + 1);
if (unlikely(ret))
goto out;
EBUG_ON(!btree_node_intent_locked(i->path, i->level));
if (i->key_cache_already_flushed)
continue;
if (i->flags & BTREE_UPDATE_NOJOURNAL)
continue;
/* we're going to journal the key being updated: */
trans->journal_u64s += jset_u64s(i->k->k.u64s);
/* and we're also going to log the overwrite: */
if (trans->journal_transaction_names)
trans->journal_u64s += jset_u64s(i->old_k.u64s);
}
trans_for_each_wb_update(trans, wb)
trans->journal_u64s += jset_u64s(wb->k.k.u64s);
if (trans->extra_journal_res) {
ret = bch2_disk_reservation_add(c, trans->disk_res,
trans->extra_journal_res,
(flags & BTREE_INSERT_NOFAIL)
? BCH_DISK_RESERVATION_NOFAIL : 0);
if (ret)
goto err;
}
retry:
bch2_trans_verify_not_in_restart(trans);
memset(&trans->journal_res, 0, sizeof(trans->journal_res));
ret = do_bch2_trans_commit(trans, flags, &i, _RET_IP_);
/* make sure we didn't drop or screw up locks: */
bch2_trans_verify_locks(trans);
if (ret)
goto err;
trace_and_count(c, transaction_commit, trans, _RET_IP_);
out:
if (likely(!(flags & BTREE_INSERT_NOCHECK_RW)))
bch2_write_ref_put(c, BCH_WRITE_REF_trans);
out_reset:
if (!ret)
bch2_trans_downgrade(trans);
bch2_trans_reset_updates(trans);
return ret;
err:
ret = bch2_trans_commit_error(trans, flags, i, ret, _RET_IP_);
if (ret)
goto out;
goto retry;
}