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kernel/fs/bcachefs/btree_gc.c

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33 KiB
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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2010 Kent Overstreet <kent.overstreet@gmail.com>
* Copyright (C) 2014 Datera Inc.
*/
#include "bcachefs.h"
#include "alloc_background.h"
#include "alloc_foreground.h"
#include "backpointers.h"
#include "bkey_methods.h"
#include "bkey_buf.h"
#include "btree_journal_iter.h"
#include "btree_key_cache.h"
#include "btree_locking.h"
#include "btree_node_scan.h"
#include "btree_update_interior.h"
#include "btree_io.h"
#include "btree_gc.h"
#include "buckets.h"
#include "clock.h"
#include "debug.h"
#include "disk_accounting.h"
#include "ec.h"
#include "error.h"
#include "extents.h"
#include "journal.h"
#include "keylist.h"
#include "move.h"
#include "recovery_passes.h"
#include "reflink.h"
#include "replicas.h"
#include "super-io.h"
#include "trace.h"
#include <linux/slab.h>
#include <linux/bitops.h>
#include <linux/freezer.h>
#include <linux/kthread.h>
#include <linux/preempt.h>
#include <linux/rcupdate.h>
#include <linux/sched/task.h>
#define DROP_THIS_NODE 10
#define DROP_PREV_NODE 11
#define DID_FILL_FROM_SCAN 12
static const char * const bch2_gc_phase_strs[] = {
#define x(n) #n,
GC_PHASES()
#undef x
NULL
};
void bch2_gc_pos_to_text(struct printbuf *out, struct gc_pos *p)
{
prt_str(out, bch2_gc_phase_strs[p->phase]);
prt_char(out, ' ');
bch2_btree_id_to_text(out, p->btree);
prt_printf(out, " l=%u ", p->level);
bch2_bpos_to_text(out, p->pos);
}
static struct bkey_s unsafe_bkey_s_c_to_s(struct bkey_s_c k)
{
return (struct bkey_s) {{{
(struct bkey *) k.k,
(struct bch_val *) k.v
}}};
}
static inline void __gc_pos_set(struct bch_fs *c, struct gc_pos new_pos)
{
preempt_disable();
write_seqcount_begin(&c->gc_pos_lock);
c->gc_pos = new_pos;
write_seqcount_end(&c->gc_pos_lock);
preempt_enable();
}
static inline void gc_pos_set(struct bch_fs *c, struct gc_pos new_pos)
{
BUG_ON(gc_pos_cmp(new_pos, c->gc_pos) < 0);
__gc_pos_set(c, new_pos);
}
static void btree_ptr_to_v2(struct btree *b, struct bkey_i_btree_ptr_v2 *dst)
{
switch (b->key.k.type) {
case KEY_TYPE_btree_ptr: {
struct bkey_i_btree_ptr *src = bkey_i_to_btree_ptr(&b->key);
dst->k.p = src->k.p;
dst->v.mem_ptr = 0;
dst->v.seq = b->data->keys.seq;
dst->v.sectors_written = 0;
dst->v.flags = 0;
dst->v.min_key = b->data->min_key;
set_bkey_val_bytes(&dst->k, sizeof(dst->v) + bkey_val_bytes(&src->k));
memcpy(dst->v.start, src->v.start, bkey_val_bytes(&src->k));
break;
}
case KEY_TYPE_btree_ptr_v2:
bkey_copy(&dst->k_i, &b->key);
break;
default:
BUG();
}
}
static int set_node_min(struct bch_fs *c, struct btree *b, struct bpos new_min)
{
struct bkey_i_btree_ptr_v2 *new;
int ret;
if (c->opts.verbose) {
struct printbuf buf = PRINTBUF;
bch2_bkey_val_to_text(&buf, c, bkey_i_to_s_c(&b->key));
prt_str(&buf, " -> ");
bch2_bpos_to_text(&buf, new_min);
bch_info(c, "%s(): %s", __func__, buf.buf);
printbuf_exit(&buf);
}
new = kmalloc_array(BKEY_BTREE_PTR_U64s_MAX, sizeof(u64), GFP_KERNEL);
if (!new)
return -BCH_ERR_ENOMEM_gc_repair_key;
btree_ptr_to_v2(b, new);
b->data->min_key = new_min;
new->v.min_key = new_min;
SET_BTREE_PTR_RANGE_UPDATED(&new->v, true);
ret = bch2_journal_key_insert_take(c, b->c.btree_id, b->c.level + 1, &new->k_i);
if (ret) {
kfree(new);
return ret;
}
bch2_btree_node_drop_keys_outside_node(b);
bkey_copy(&b->key, &new->k_i);
return 0;
}
static int set_node_max(struct bch_fs *c, struct btree *b, struct bpos new_max)
{
struct bkey_i_btree_ptr_v2 *new;
int ret;
if (c->opts.verbose) {
struct printbuf buf = PRINTBUF;
bch2_bkey_val_to_text(&buf, c, bkey_i_to_s_c(&b->key));
prt_str(&buf, " -> ");
bch2_bpos_to_text(&buf, new_max);
bch_info(c, "%s(): %s", __func__, buf.buf);
printbuf_exit(&buf);
}
ret = bch2_journal_key_delete(c, b->c.btree_id, b->c.level + 1, b->key.k.p);
if (ret)
return ret;
new = kmalloc_array(BKEY_BTREE_PTR_U64s_MAX, sizeof(u64), GFP_KERNEL);
if (!new)
return -BCH_ERR_ENOMEM_gc_repair_key;
btree_ptr_to_v2(b, new);
b->data->max_key = new_max;
new->k.p = new_max;
SET_BTREE_PTR_RANGE_UPDATED(&new->v, true);
ret = bch2_journal_key_insert_take(c, b->c.btree_id, b->c.level + 1, &new->k_i);
if (ret) {
kfree(new);
return ret;
}
bch2_btree_node_drop_keys_outside_node(b);
mutex_lock(&c->btree_cache.lock);
__bch2_btree_node_hash_remove(&c->btree_cache, b);
bkey_copy(&b->key, &new->k_i);
ret = __bch2_btree_node_hash_insert(&c->btree_cache, b);
BUG_ON(ret);
mutex_unlock(&c->btree_cache.lock);
return 0;
}
static int btree_check_node_boundaries(struct btree_trans *trans, struct btree *b,
struct btree *prev, struct btree *cur,
struct bpos *pulled_from_scan)
{
struct bch_fs *c = trans->c;
struct bpos expected_start = !prev
? b->data->min_key
: bpos_successor(prev->key.k.p);
struct printbuf buf = PRINTBUF;
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 (bpos_eq(expected_start, cur->data->min_key))
return 0;
prt_printf(&buf, " at btree %s level %u:\n parent: ",
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));
if (prev) {
prt_printf(&buf, "\n prev: ");
bch2_bkey_val_to_text(&buf, c, bkey_i_to_s_c(&prev->key));
}
prt_str(&buf, "\n next: ");
bch2_bkey_val_to_text(&buf, c, bkey_i_to_s_c(&cur->key));
if (bpos_lt(expected_start, cur->data->min_key)) { /* gap */
if (b->c.level == 1 &&
bpos_lt(*pulled_from_scan, cur->data->min_key)) {
ret = bch2_get_scanned_nodes(c, b->c.btree_id, 0,
expected_start,
bpos_predecessor(cur->data->min_key));
if (ret)
goto err;
*pulled_from_scan = cur->data->min_key;
ret = DID_FILL_FROM_SCAN;
} else {
if (mustfix_fsck_err(trans, btree_node_topology_bad_min_key,
"btree node with incorrect min_key%s", buf.buf))
ret = set_node_min(c, cur, expected_start);
}
} else { /* overlap */
if (prev && BTREE_NODE_SEQ(cur->data) > BTREE_NODE_SEQ(prev->data)) { /* cur overwrites prev */
if (bpos_ge(prev->data->min_key, cur->data->min_key)) { /* fully? */
if (mustfix_fsck_err(trans, btree_node_topology_overwritten_by_next_node,
"btree node overwritten by next node%s", buf.buf))
ret = DROP_PREV_NODE;
} else {
if (mustfix_fsck_err(trans, btree_node_topology_bad_max_key,
"btree node with incorrect max_key%s", buf.buf))
ret = set_node_max(c, prev,
bpos_predecessor(cur->data->min_key));
}
} else {
if (bpos_ge(expected_start, cur->data->max_key)) { /* fully? */
if (mustfix_fsck_err(trans, btree_node_topology_overwritten_by_prev_node,
"btree node overwritten by prev node%s", buf.buf))
ret = DROP_THIS_NODE;
} else {
if (mustfix_fsck_err(trans, btree_node_topology_bad_min_key,
"btree node with incorrect min_key%s", buf.buf))
ret = set_node_min(c, cur, expected_start);
}
}
}
err:
fsck_err:
printbuf_exit(&buf);
return ret;
}
static int btree_repair_node_end(struct btree_trans *trans, struct btree *b,
struct btree *child, struct bpos *pulled_from_scan)
{
struct bch_fs *c = trans->c;
struct printbuf buf = PRINTBUF;
int ret = 0;
if (bpos_eq(child->key.k.p, b->key.k.p))
return 0;
prt_printf(&buf, "at btree %s level %u:\n parent: ",
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 child: ");
bch2_bkey_val_to_text(&buf, c, bkey_i_to_s_c(&child->key));
if (mustfix_fsck_err(trans, btree_node_topology_bad_max_key,
"btree node with incorrect max_key%s", buf.buf)) {
if (b->c.level == 1 &&
bpos_lt(*pulled_from_scan, b->key.k.p)) {
ret = bch2_get_scanned_nodes(c, b->c.btree_id, 0,
bpos_successor(child->key.k.p), b->key.k.p);
if (ret)
goto err;
*pulled_from_scan = b->key.k.p;
ret = DID_FILL_FROM_SCAN;
} else {
ret = set_node_max(c, child, b->key.k.p);
}
}
err:
fsck_err:
printbuf_exit(&buf);
return ret;
}
static int bch2_btree_repair_topology_recurse(struct btree_trans *trans, struct btree *b,
struct bpos *pulled_from_scan)
{
struct bch_fs *c = trans->c;
struct btree_and_journal_iter iter;
struct bkey_s_c k;
struct bkey_buf prev_k, cur_k;
struct btree *prev = NULL, *cur = NULL;
bool have_child, new_pass = false;
struct printbuf buf = PRINTBUF;
int ret = 0;
if (!b->c.level)
return 0;
bch2_bkey_buf_init(&prev_k);
bch2_bkey_buf_init(&cur_k);
again:
cur = prev = NULL;
have_child = new_pass = false;
bch2_btree_and_journal_iter_init_node_iter(trans, &iter, b);
iter.prefetch = true;
while ((k = bch2_btree_and_journal_iter_peek(&iter)).k) {
BUG_ON(bpos_lt(k.k->p, b->data->min_key));
BUG_ON(bpos_gt(k.k->p, b->data->max_key));
bch2_btree_and_journal_iter_advance(&iter);
bch2_bkey_buf_reassemble(&cur_k, c, k);
cur = bch2_btree_node_get_noiter(trans, cur_k.k,
b->c.btree_id, b->c.level - 1,
false);
ret = PTR_ERR_OR_ZERO(cur);
printbuf_reset(&buf);
bch2_bkey_val_to_text(&buf, c, bkey_i_to_s_c(cur_k.k));
if (mustfix_fsck_err_on(bch2_err_matches(ret, EIO),
trans, btree_node_unreadable,
"Topology repair: unreadable btree node at btree %s level %u:\n"
" %s",
bch2_btree_id_str(b->c.btree_id),
b->c.level - 1,
buf.buf)) {
bch2_btree_node_evict(trans, cur_k.k);
cur = NULL;
ret = bch2_journal_key_delete(c, b->c.btree_id,
b->c.level, cur_k.k->k.p);
if (ret)
break;
if (!btree_id_is_alloc(b->c.btree_id)) {
ret = bch2_run_explicit_recovery_pass(c, BCH_RECOVERY_PASS_scan_for_btree_nodes);
if (ret)
break;
}
continue;
}
bch_err_msg(c, ret, "getting btree node");
if (ret)
break;
if (bch2_btree_node_is_stale(c, cur)) {
bch_info(c, "btree node %s older than nodes found by scanning", buf.buf);
six_unlock_read(&cur->c.lock);
bch2_btree_node_evict(trans, cur_k.k);
ret = bch2_journal_key_delete(c, b->c.btree_id,
b->c.level, cur_k.k->k.p);
cur = NULL;
if (ret)
break;
continue;
}
ret = btree_check_node_boundaries(trans, b, prev, cur, pulled_from_scan);
if (ret == DID_FILL_FROM_SCAN) {
new_pass = true;
ret = 0;
}
if (ret == DROP_THIS_NODE) {
six_unlock_read(&cur->c.lock);
bch2_btree_node_evict(trans, cur_k.k);
ret = bch2_journal_key_delete(c, b->c.btree_id,
b->c.level, cur_k.k->k.p);
cur = NULL;
if (ret)
break;
continue;
}
if (prev)
six_unlock_read(&prev->c.lock);
prev = NULL;
if (ret == DROP_PREV_NODE) {
bch_info(c, "dropped prev node");
bch2_btree_node_evict(trans, prev_k.k);
ret = bch2_journal_key_delete(c, b->c.btree_id,
b->c.level, prev_k.k->k.p);
if (ret)
break;
bch2_btree_and_journal_iter_exit(&iter);
goto again;
} else if (ret)
break;
prev = cur;
cur = NULL;
bch2_bkey_buf_copy(&prev_k, c, cur_k.k);
}
if (!ret && !IS_ERR_OR_NULL(prev)) {
BUG_ON(cur);
ret = btree_repair_node_end(trans, b, prev, pulled_from_scan);
if (ret == DID_FILL_FROM_SCAN) {
new_pass = true;
ret = 0;
}
}
if (!IS_ERR_OR_NULL(prev))
six_unlock_read(&prev->c.lock);
prev = NULL;
if (!IS_ERR_OR_NULL(cur))
six_unlock_read(&cur->c.lock);
cur = NULL;
if (ret)
goto err;
bch2_btree_and_journal_iter_exit(&iter);
if (new_pass)
goto again;
bch2_btree_and_journal_iter_init_node_iter(trans, &iter, b);
iter.prefetch = true;
while ((k = bch2_btree_and_journal_iter_peek(&iter)).k) {
bch2_bkey_buf_reassemble(&cur_k, c, k);
bch2_btree_and_journal_iter_advance(&iter);
cur = bch2_btree_node_get_noiter(trans, cur_k.k,
b->c.btree_id, b->c.level - 1,
false);
ret = PTR_ERR_OR_ZERO(cur);
bch_err_msg(c, ret, "getting btree node");
if (ret)
goto err;
ret = bch2_btree_repair_topology_recurse(trans, cur, pulled_from_scan);
six_unlock_read(&cur->c.lock);
cur = NULL;
if (ret == DROP_THIS_NODE) {
bch2_btree_node_evict(trans, cur_k.k);
ret = bch2_journal_key_delete(c, b->c.btree_id,
b->c.level, cur_k.k->k.p);
new_pass = true;
}
if (ret)
goto err;
have_child = true;
}
printbuf_reset(&buf);
bch2_bkey_val_to_text(&buf, c, bkey_i_to_s_c(&b->key));
if (mustfix_fsck_err_on(!have_child,
trans, btree_node_topology_interior_node_empty,
"empty interior btree node at btree %s level %u\n"
" %s",
bch2_btree_id_str(b->c.btree_id),
b->c.level, buf.buf))
ret = DROP_THIS_NODE;
err:
fsck_err:
if (!IS_ERR_OR_NULL(prev))
six_unlock_read(&prev->c.lock);
if (!IS_ERR_OR_NULL(cur))
six_unlock_read(&cur->c.lock);
bch2_btree_and_journal_iter_exit(&iter);
if (!ret && new_pass)
goto again;
BUG_ON(!ret && bch2_btree_node_check_topology(trans, b));
bch2_bkey_buf_exit(&prev_k, c);
bch2_bkey_buf_exit(&cur_k, c);
printbuf_exit(&buf);
return ret;
}
int bch2_check_topology(struct bch_fs *c)
{
struct btree_trans *trans = bch2_trans_get(c);
struct bpos pulled_from_scan = POS_MIN;
int ret = 0;
bch2_trans_srcu_unlock(trans);
for (unsigned i = 0; i < btree_id_nr_alive(c) && !ret; i++) {
struct btree_root *r = bch2_btree_id_root(c, i);
bool reconstructed_root = false;
if (r->error) {
ret = bch2_run_explicit_recovery_pass(c, BCH_RECOVERY_PASS_scan_for_btree_nodes);
if (ret)
break;
reconstruct_root:
bch_info(c, "btree root %s unreadable, must recover from scan", bch2_btree_id_str(i));
r->alive = false;
r->error = 0;
if (!bch2_btree_has_scanned_nodes(c, i)) {
mustfix_fsck_err(trans, btree_root_unreadable_and_scan_found_nothing,
"no nodes found for btree %s, continue?", bch2_btree_id_str(i));
bch2_btree_root_alloc_fake_trans(trans, i, 0);
} else {
bch2_btree_root_alloc_fake_trans(trans, i, 1);
bch2_shoot_down_journal_keys(c, i, 1, BTREE_MAX_DEPTH, POS_MIN, SPOS_MAX);
ret = bch2_get_scanned_nodes(c, i, 0, POS_MIN, SPOS_MAX);
if (ret)
break;
}
reconstructed_root = true;
}
struct btree *b = r->b;
btree_node_lock_nopath_nofail(trans, &b->c, SIX_LOCK_read);
ret = bch2_btree_repair_topology_recurse(trans, b, &pulled_from_scan);
six_unlock_read(&b->c.lock);
if (ret == DROP_THIS_NODE) {
mutex_lock(&c->btree_cache.lock);
bch2_btree_node_hash_remove(&c->btree_cache, b);
mutex_unlock(&c->btree_cache.lock);
r->b = NULL;
if (!reconstructed_root)
goto reconstruct_root;
bch_err(c, "empty btree root %s", bch2_btree_id_str(i));
bch2_btree_root_alloc_fake_trans(trans, i, 0);
r->alive = false;
ret = 0;
}
}
fsck_err:
bch2_trans_put(trans);
return ret;
}
/* marking of btree keys/nodes: */
static int bch2_gc_mark_key(struct btree_trans *trans, enum btree_id btree_id,
unsigned level, struct btree **prev,
struct btree_iter *iter, struct bkey_s_c k,
bool initial)
{
struct bch_fs *c = trans->c;
if (iter) {
struct btree_path *path = btree_iter_path(trans, iter);
struct btree *b = path_l(path)->b;
if (*prev != b) {
int ret = bch2_btree_node_check_topology(trans, b);
if (ret)
return ret;
}
*prev = b;
}
struct bkey deleted = KEY(0, 0, 0);
struct bkey_s_c old = (struct bkey_s_c) { &deleted, NULL };
struct printbuf buf = PRINTBUF;
int ret = 0;
deleted.p = k.k->p;
if (initial) {
BUG_ON(bch2_journal_seq_verify &&
k.k->bversion.lo > atomic64_read(&c->journal.seq));
if (fsck_err_on(btree_id != BTREE_ID_accounting &&
k.k->bversion.lo > atomic64_read(&c->key_version),
trans, bkey_version_in_future,
"key version number higher than recorded %llu\n %s",
atomic64_read(&c->key_version),
(bch2_bkey_val_to_text(&buf, c, k), buf.buf)))
atomic64_set(&c->key_version, k.k->bversion.lo);
}
if (mustfix_fsck_err_on(level && !bch2_dev_btree_bitmap_marked(c, k),
trans, btree_bitmap_not_marked,
"btree ptr not marked in member info btree allocated bitmap\n %s",
(printbuf_reset(&buf),
bch2_bkey_val_to_text(&buf, c, k),
buf.buf))) {
mutex_lock(&c->sb_lock);
bch2_dev_btree_bitmap_mark(c, k);
bch2_write_super(c);
mutex_unlock(&c->sb_lock);
}
/*
* We require a commit before key_trigger() because
* key_trigger(BTREE_TRIGGER_GC) is not idempotant; we'll calculate the
* wrong result if we run it multiple times.
*/
unsigned flags = !iter ? BTREE_TRIGGER_is_root : 0;
ret = bch2_key_trigger(trans, btree_id, level, old, unsafe_bkey_s_c_to_s(k),
BTREE_TRIGGER_check_repair|flags);
if (ret)
goto out;
if (trans->nr_updates) {
ret = bch2_trans_commit(trans, NULL, NULL, 0) ?:
-BCH_ERR_transaction_restart_nested;
goto out;
}
ret = bch2_key_trigger(trans, btree_id, level, old, unsafe_bkey_s_c_to_s(k),
BTREE_TRIGGER_gc|BTREE_TRIGGER_insert|flags);
out:
fsck_err:
printbuf_exit(&buf);
bch_err_fn(c, ret);
return ret;
}
static int bch2_gc_btree(struct btree_trans *trans, enum btree_id btree, bool initial)
{
struct bch_fs *c = trans->c;
unsigned target_depth = btree_node_type_has_triggers(__btree_node_type(0, btree)) ? 0 : 1;
int ret = 0;
/* We need to make sure every leaf node is readable before going RW */
if (initial)
target_depth = 0;
for (unsigned level = target_depth; level < BTREE_MAX_DEPTH; level++) {
struct btree *prev = NULL;
struct btree_iter iter;
bch2_trans_node_iter_init(trans, &iter, btree, POS_MIN, 0, level,
BTREE_ITER_prefetch);
ret = for_each_btree_key_continue(trans, iter, 0, k, ({
gc_pos_set(c, gc_pos_btree(btree, level, k.k->p));
bch2_gc_mark_key(trans, btree, level, &prev, &iter, k, initial);
}));
if (ret)
goto err;
}
/* root */
do {
retry_root:
bch2_trans_begin(trans);
struct btree_iter iter;
bch2_trans_node_iter_init(trans, &iter, btree, POS_MIN,
0, bch2_btree_id_root(c, btree)->b->c.level, 0);
struct btree *b = bch2_btree_iter_peek_node(&iter);
ret = PTR_ERR_OR_ZERO(b);
if (ret)
goto err_root;
if (b != btree_node_root(c, b)) {
bch2_trans_iter_exit(trans, &iter);
goto retry_root;
}
gc_pos_set(c, gc_pos_btree(btree, b->c.level + 1, SPOS_MAX));
struct bkey_s_c k = bkey_i_to_s_c(&b->key);
ret = bch2_gc_mark_key(trans, btree, b->c.level + 1, NULL, NULL, k, initial);
err_root:
bch2_trans_iter_exit(trans, &iter);
} while (bch2_err_matches(ret, BCH_ERR_transaction_restart));
err:
bch_err_fn(c, ret);
return ret;
}
static inline int btree_id_gc_phase_cmp(enum btree_id l, enum btree_id r)
{
return cmp_int(gc_btree_order(l), gc_btree_order(r));
}
static int bch2_gc_btrees(struct bch_fs *c)
{
struct btree_trans *trans = bch2_trans_get(c);
enum btree_id ids[BTREE_ID_NR];
unsigned i;
int ret = 0;
for (i = 0; i < BTREE_ID_NR; i++)
ids[i] = i;
bubble_sort(ids, BTREE_ID_NR, btree_id_gc_phase_cmp);
for (i = 0; i < btree_id_nr_alive(c) && !ret; i++) {
unsigned btree = i < BTREE_ID_NR ? ids[i] : i;
if (IS_ERR_OR_NULL(bch2_btree_id_root(c, btree)->b))
continue;
ret = bch2_gc_btree(trans, btree, true);
if (mustfix_fsck_err_on(bch2_err_matches(ret, EIO),
trans, btree_node_read_error,
"btree node read error for %s",
bch2_btree_id_str(btree)))
ret = bch2_run_explicit_recovery_pass(c, BCH_RECOVERY_PASS_check_topology);
}
fsck_err:
bch2_trans_put(trans);
bch_err_fn(c, ret);
return ret;
}
static int bch2_mark_superblocks(struct bch_fs *c)
{
gc_pos_set(c, gc_phase(GC_PHASE_sb));
return bch2_trans_mark_dev_sbs_flags(c, BTREE_TRIGGER_gc);
}
static void bch2_gc_free(struct bch_fs *c)
{
bch2_accounting_gc_free(c);
genradix_free(&c->reflink_gc_table);
genradix_free(&c->gc_stripes);
for_each_member_device(c, ca)
genradix_free(&ca->buckets_gc);
}
static int bch2_gc_start(struct bch_fs *c)
{
for_each_member_device(c, ca) {
int ret = bch2_dev_usage_init(ca, true);
if (ret) {
bch2_dev_put(ca);
return ret;
}
}
return 0;
}
/* returns true if not equal */
static inline bool bch2_alloc_v4_cmp(struct bch_alloc_v4 l,
struct bch_alloc_v4 r)
{
return l.gen != r.gen ||
l.oldest_gen != r.oldest_gen ||
l.data_type != r.data_type ||
l.dirty_sectors != r.dirty_sectors ||
l.stripe_sectors != r.stripe_sectors ||
l.cached_sectors != r.cached_sectors ||
l.stripe_redundancy != r.stripe_redundancy ||
l.stripe != r.stripe;
}
static int bch2_alloc_write_key(struct btree_trans *trans,
struct btree_iter *iter,
struct bch_dev *ca,
struct bkey_s_c k)
{
struct bch_fs *c = trans->c;
struct bkey_i_alloc_v4 *a;
struct bch_alloc_v4 old_gc, gc, old_convert, new;
const struct bch_alloc_v4 *old;
int ret;
if (!bucket_valid(ca, k.k->p.offset))
return 0;
old = bch2_alloc_to_v4(k, &old_convert);
gc = new = *old;
percpu_down_read(&c->mark_lock);
__bucket_m_to_alloc(&gc, *gc_bucket(ca, iter->pos.offset));
old_gc = gc;
if ((old->data_type == BCH_DATA_sb ||
old->data_type == BCH_DATA_journal) &&
!bch2_dev_is_online(ca)) {
gc.data_type = old->data_type;
gc.dirty_sectors = old->dirty_sectors;
}
percpu_up_read(&c->mark_lock);
/*
* gc.data_type doesn't yet include need_discard & need_gc_gen states -
* fix that here:
*/
alloc_data_type_set(&gc, gc.data_type);
if (gc.data_type != old_gc.data_type ||
gc.dirty_sectors != old_gc.dirty_sectors) {
ret = bch2_alloc_key_to_dev_counters(trans, ca, &old_gc, &gc, BTREE_TRIGGER_gc);
if (ret)
return ret;
/*
* Ugly: alloc_key_to_dev_counters(..., BTREE_TRIGGER_gc) is not
* safe w.r.t. transaction restarts, so fixup the gc_bucket so
* we don't run it twice:
*/
percpu_down_read(&c->mark_lock);
struct bucket *gc_m = gc_bucket(ca, iter->pos.offset);
gc_m->data_type = gc.data_type;
gc_m->dirty_sectors = gc.dirty_sectors;
percpu_up_read(&c->mark_lock);
}
if (fsck_err_on(new.data_type != gc.data_type,
trans, alloc_key_data_type_wrong,
"bucket %llu:%llu gen %u has wrong data_type"
": got %s, should be %s",
iter->pos.inode, iter->pos.offset,
gc.gen,
bch2_data_type_str(new.data_type),
bch2_data_type_str(gc.data_type)))
new.data_type = gc.data_type;
#define copy_bucket_field(_errtype, _f) \
if (fsck_err_on(new._f != gc._f, \
trans, _errtype, \
"bucket %llu:%llu gen %u data type %s has wrong " #_f \
": got %llu, should be %llu", \
iter->pos.inode, iter->pos.offset, \
gc.gen, \
bch2_data_type_str(gc.data_type), \
(u64) new._f, (u64) gc._f)) \
new._f = gc._f; \
copy_bucket_field(alloc_key_gen_wrong, gen);
copy_bucket_field(alloc_key_dirty_sectors_wrong, dirty_sectors);
copy_bucket_field(alloc_key_stripe_sectors_wrong, stripe_sectors);
copy_bucket_field(alloc_key_cached_sectors_wrong, cached_sectors);
copy_bucket_field(alloc_key_stripe_wrong, stripe);
copy_bucket_field(alloc_key_stripe_redundancy_wrong, stripe_redundancy);
#undef copy_bucket_field
if (!bch2_alloc_v4_cmp(*old, new))
return 0;
a = bch2_alloc_to_v4_mut(trans, k);
ret = PTR_ERR_OR_ZERO(a);
if (ret)
return ret;
a->v = new;
/*
* The trigger normally makes sure these are set, but we're not running
* triggers:
*/
if (a->v.data_type == BCH_DATA_cached && !a->v.io_time[READ])
a->v.io_time[READ] = max_t(u64, 1, atomic64_read(&c->io_clock[READ].now));
ret = bch2_trans_update(trans, iter, &a->k_i, BTREE_TRIGGER_norun);
fsck_err:
return ret;
}
static int bch2_gc_alloc_done(struct bch_fs *c)
{
int ret = 0;
for_each_member_device(c, ca) {
ret = bch2_trans_run(c,
for_each_btree_key_upto_commit(trans, iter, BTREE_ID_alloc,
POS(ca->dev_idx, ca->mi.first_bucket),
POS(ca->dev_idx, ca->mi.nbuckets - 1),
BTREE_ITER_slots|BTREE_ITER_prefetch, k,
NULL, NULL, BCH_TRANS_COMMIT_lazy_rw,
bch2_alloc_write_key(trans, &iter, ca, k)));
if (ret) {
bch2_dev_put(ca);
break;
}
}
bch_err_fn(c, ret);
return ret;
}
static int bch2_gc_alloc_start(struct bch_fs *c)
{
int ret = 0;
for_each_member_device(c, ca) {
ret = genradix_prealloc(&ca->buckets_gc, ca->mi.nbuckets, GFP_KERNEL);
if (ret) {
bch2_dev_put(ca);
ret = -BCH_ERR_ENOMEM_gc_alloc_start;
break;
}
}
bch_err_fn(c, ret);
return ret;
}
static int bch2_gc_write_reflink_key(struct btree_trans *trans,
struct btree_iter *iter,
struct bkey_s_c k,
size_t *idx)
{
struct bch_fs *c = trans->c;
const __le64 *refcount = bkey_refcount_c(k);
struct printbuf buf = PRINTBUF;
struct reflink_gc *r;
int ret = 0;
if (!refcount)
return 0;
while ((r = genradix_ptr(&c->reflink_gc_table, *idx)) &&
r->offset < k.k->p.offset)
++*idx;
if (!r ||
r->offset != k.k->p.offset ||
r->size != k.k->size) {
bch_err(c, "unexpected inconsistency walking reflink table at gc finish");
return -EINVAL;
}
if (fsck_err_on(r->refcount != le64_to_cpu(*refcount),
trans, reflink_v_refcount_wrong,
"reflink key has wrong refcount:\n"
" %s\n"
" should be %u",
(bch2_bkey_val_to_text(&buf, c, k), buf.buf),
r->refcount)) {
struct bkey_i *new = bch2_bkey_make_mut_noupdate(trans, k);
ret = PTR_ERR_OR_ZERO(new);
if (ret)
goto out;
if (!r->refcount)
new->k.type = KEY_TYPE_deleted;
else
*bkey_refcount(bkey_i_to_s(new)) = cpu_to_le64(r->refcount);
ret = bch2_trans_update(trans, iter, new, 0);
}
out:
fsck_err:
printbuf_exit(&buf);
return ret;
}
static int bch2_gc_reflink_done(struct bch_fs *c)
{
size_t idx = 0;
int ret = bch2_trans_run(c,
for_each_btree_key_commit(trans, iter,
BTREE_ID_reflink, POS_MIN,
BTREE_ITER_prefetch, k,
NULL, NULL, BCH_TRANS_COMMIT_no_enospc,
bch2_gc_write_reflink_key(trans, &iter, k, &idx)));
c->reflink_gc_nr = 0;
return ret;
}
static int bch2_gc_reflink_start(struct bch_fs *c)
{
c->reflink_gc_nr = 0;
int ret = bch2_trans_run(c,
for_each_btree_key(trans, iter, BTREE_ID_reflink, POS_MIN,
BTREE_ITER_prefetch, k, ({
const __le64 *refcount = bkey_refcount_c(k);
if (!refcount)
continue;
struct reflink_gc *r = genradix_ptr_alloc(&c->reflink_gc_table,
c->reflink_gc_nr++, GFP_KERNEL);
if (!r) {
ret = -BCH_ERR_ENOMEM_gc_reflink_start;
break;
}
r->offset = k.k->p.offset;
r->size = k.k->size;
r->refcount = 0;
0;
})));
bch_err_fn(c, ret);
return ret;
}
static int bch2_gc_write_stripes_key(struct btree_trans *trans,
struct btree_iter *iter,
struct bkey_s_c k)
{
struct bch_fs *c = trans->c;
struct printbuf buf = PRINTBUF;
const struct bch_stripe *s;
struct gc_stripe *m;
bool bad = false;
unsigned i;
int ret = 0;
if (k.k->type != KEY_TYPE_stripe)
return 0;
s = bkey_s_c_to_stripe(k).v;
m = genradix_ptr(&c->gc_stripes, k.k->p.offset);
for (i = 0; i < s->nr_blocks; i++) {
u32 old = stripe_blockcount_get(s, i);
u32 new = (m ? m->block_sectors[i] : 0);
if (old != new) {
prt_printf(&buf, "stripe block %u has wrong sector count: got %u, should be %u\n",
i, old, new);
bad = true;
}
}
if (bad)
bch2_bkey_val_to_text(&buf, c, k);
if (fsck_err_on(bad,
trans, stripe_sector_count_wrong,
"%s", buf.buf)) {
struct bkey_i_stripe *new;
new = bch2_trans_kmalloc(trans, bkey_bytes(k.k));
ret = PTR_ERR_OR_ZERO(new);
if (ret)
return ret;
bkey_reassemble(&new->k_i, k);
for (i = 0; i < new->v.nr_blocks; i++)
stripe_blockcount_set(&new->v, i, m ? m->block_sectors[i] : 0);
ret = bch2_trans_update(trans, iter, &new->k_i, 0);
}
fsck_err:
printbuf_exit(&buf);
return ret;
}
static int bch2_gc_stripes_done(struct bch_fs *c)
{
return bch2_trans_run(c,
for_each_btree_key_commit(trans, iter,
BTREE_ID_stripes, POS_MIN,
BTREE_ITER_prefetch, k,
NULL, NULL, BCH_TRANS_COMMIT_no_enospc,
bch2_gc_write_stripes_key(trans, &iter, k)));
}
/**
* bch2_check_allocations - walk all references to buckets, and recompute them:
*
* @c: filesystem object
*
* Returns: 0 on success, or standard errcode on failure
*
* Order matters here:
* - Concurrent GC relies on the fact that we have a total ordering for
* everything that GC walks - see gc_will_visit_node(),
* gc_will_visit_root()
*
* - also, references move around in the course of index updates and
* various other crap: everything needs to agree on the ordering
* references are allowed to move around in - e.g., we're allowed to
* start with a reference owned by an open_bucket (the allocator) and
* move it to the btree, but not the reverse.
*
* This is necessary to ensure that gc doesn't miss references that
* move around - if references move backwards in the ordering GC
* uses, GC could skip past them
*/
int bch2_check_allocations(struct bch_fs *c)
{
int ret;
lockdep_assert_held(&c->state_lock);
down_write(&c->gc_lock);
bch2_btree_interior_updates_flush(c);
ret = bch2_gc_accounting_start(c) ?:
bch2_gc_start(c) ?:
bch2_gc_alloc_start(c) ?:
bch2_gc_reflink_start(c);
if (ret)
goto out;
gc_pos_set(c, gc_phase(GC_PHASE_start));
ret = bch2_mark_superblocks(c);
bch_err_msg(c, ret, "marking superblocks");
if (ret)
goto out;
ret = bch2_gc_btrees(c);
if (ret)
goto out;
c->gc_count++;
ret = bch2_gc_alloc_done(c) ?:
bch2_gc_accounting_done(c) ?:
bch2_gc_stripes_done(c) ?:
bch2_gc_reflink_done(c);
out:
percpu_down_write(&c->mark_lock);
/* Indicates that gc is no longer in progress: */
__gc_pos_set(c, gc_phase(GC_PHASE_not_running));
bch2_gc_free(c);
percpu_up_write(&c->mark_lock);
up_write(&c->gc_lock);
/*
* At startup, allocations can happen directly instead of via the
* allocator thread - issue wakeup in case they blocked on gc_lock:
*/
closure_wake_up(&c->freelist_wait);
bch_err_fn(c, ret);
return ret;
}
static int gc_btree_gens_key(struct btree_trans *trans,
struct btree_iter *iter,
struct bkey_s_c k)
{
struct bch_fs *c = trans->c;
struct bkey_ptrs_c ptrs = bch2_bkey_ptrs_c(k);
struct bkey_i *u;
int ret;
if (unlikely(test_bit(BCH_FS_going_ro, &c->flags)))
return -EROFS;
percpu_down_read(&c->mark_lock);
rcu_read_lock();
bkey_for_each_ptr(ptrs, ptr) {
struct bch_dev *ca = bch2_dev_rcu(c, ptr->dev);
if (!ca)
continue;
if (dev_ptr_stale(ca, ptr) > 16) {
rcu_read_unlock();
percpu_up_read(&c->mark_lock);
goto update;
}
}
bkey_for_each_ptr(ptrs, ptr) {
struct bch_dev *ca = bch2_dev_rcu(c, ptr->dev);
if (!ca)
continue;
u8 *gen = &ca->oldest_gen[PTR_BUCKET_NR(ca, ptr)];
if (gen_after(*gen, ptr->gen))
*gen = ptr->gen;
}
rcu_read_unlock();
percpu_up_read(&c->mark_lock);
return 0;
update:
u = bch2_bkey_make_mut(trans, iter, &k, 0);
ret = PTR_ERR_OR_ZERO(u);
if (ret)
return ret;
bch2_extent_normalize(c, bkey_i_to_s(u));
return 0;
}
static int bch2_alloc_write_oldest_gen(struct btree_trans *trans, struct bch_dev *ca,
struct btree_iter *iter, struct bkey_s_c k)
{
struct bch_alloc_v4 a_convert;
const struct bch_alloc_v4 *a = bch2_alloc_to_v4(k, &a_convert);
struct bkey_i_alloc_v4 *a_mut;
int ret;
if (a->oldest_gen == ca->oldest_gen[iter->pos.offset])
return 0;
a_mut = bch2_alloc_to_v4_mut(trans, k);
ret = PTR_ERR_OR_ZERO(a_mut);
if (ret)
return ret;
a_mut->v.oldest_gen = ca->oldest_gen[iter->pos.offset];
alloc_data_type_set(&a_mut->v, a_mut->v.data_type);
return bch2_trans_update(trans, iter, &a_mut->k_i, 0);
}
int bch2_gc_gens(struct bch_fs *c)
{
u64 b, start_time = local_clock();
int ret;
if (!mutex_trylock(&c->gc_gens_lock))
return 0;
trace_and_count(c, gc_gens_start, c);
/*
* We have to use trylock here. Otherwise, we would
* introduce a deadlock in the RO path - we take the
* state lock at the start of going RO.
*/
if (!down_read_trylock(&c->state_lock)) {
mutex_unlock(&c->gc_gens_lock);
return 0;
}
for_each_member_device(c, ca) {
struct bucket_gens *gens = bucket_gens(ca);
BUG_ON(ca->oldest_gen);
ca->oldest_gen = kvmalloc(gens->nbuckets, GFP_KERNEL);
if (!ca->oldest_gen) {
bch2_dev_put(ca);
ret = -BCH_ERR_ENOMEM_gc_gens;
goto err;
}
for (b = gens->first_bucket;
b < gens->nbuckets; b++)
ca->oldest_gen[b] = gens->b[b];
}
for (unsigned i = 0; i < BTREE_ID_NR; i++)
if (btree_type_has_ptrs(i)) {
c->gc_gens_btree = i;
c->gc_gens_pos = POS_MIN;
ret = bch2_trans_run(c,
for_each_btree_key_commit(trans, iter, i,
POS_MIN,
BTREE_ITER_prefetch|BTREE_ITER_all_snapshots,
k,
NULL, NULL,
BCH_TRANS_COMMIT_no_enospc,
gc_btree_gens_key(trans, &iter, k)));
if (ret)
goto err;
}
struct bch_dev *ca = NULL;
ret = bch2_trans_run(c,
for_each_btree_key_commit(trans, iter, BTREE_ID_alloc,
POS_MIN,
BTREE_ITER_prefetch,
k,
NULL, NULL,
BCH_TRANS_COMMIT_no_enospc, ({
ca = bch2_dev_iterate(c, ca, k.k->p.inode);
if (!ca) {
bch2_btree_iter_set_pos(&iter, POS(k.k->p.inode + 1, 0));
continue;
}
bch2_alloc_write_oldest_gen(trans, ca, &iter, k);
})));
bch2_dev_put(ca);
if (ret)
goto err;
c->gc_gens_btree = 0;
c->gc_gens_pos = POS_MIN;
c->gc_count++;
bch2_time_stats_update(&c->times[BCH_TIME_btree_gc], start_time);
trace_and_count(c, gc_gens_end, c);
err:
for_each_member_device(c, ca) {
kvfree(ca->oldest_gen);
ca->oldest_gen = NULL;
}
up_read(&c->state_lock);
mutex_unlock(&c->gc_gens_lock);
if (!bch2_err_matches(ret, EROFS))
bch_err_fn(c, ret);
return ret;
}
static void bch2_gc_gens_work(struct work_struct *work)
{
struct bch_fs *c = container_of(work, struct bch_fs, gc_gens_work);
bch2_gc_gens(c);
bch2_write_ref_put(c, BCH_WRITE_REF_gc_gens);
}
void bch2_gc_gens_async(struct bch_fs *c)
{
if (bch2_write_ref_tryget(c, BCH_WRITE_REF_gc_gens) &&
!queue_work(c->write_ref_wq, &c->gc_gens_work))
bch2_write_ref_put(c, BCH_WRITE_REF_gc_gens);
}
void bch2_fs_gc_init(struct bch_fs *c)
{
seqcount_init(&c->gc_pos_lock);
INIT_WORK(&c->gc_gens_work, bch2_gc_gens_work);
}
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