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// SPDX-License-Identifier: GPL-2.0
/*
* Code for moving data off a device.
*/
#include "bcachefs.h"
#include "btree_update.h"
#include "btree_update_interior.h"
#include "buckets.h"
#include "extents.h"
#include "io.h"
#include "journal.h"
#include "keylist.h"
#include "migrate.h"
#include "move.h"
#include "replicas.h"
#include "super-io.h"
static int drop_dev_ptrs(struct bch_fs *c, struct bkey_s k,
unsigned dev_idx, int flags, bool metadata)
{
unsigned replicas = metadata ? c->opts.metadata_replicas : c->opts.data_replicas;
unsigned lost = metadata ? BCH_FORCE_IF_METADATA_LOST : BCH_FORCE_IF_DATA_LOST;
unsigned degraded = metadata ? BCH_FORCE_IF_METADATA_DEGRADED : BCH_FORCE_IF_DATA_DEGRADED;
unsigned nr_good;
bch2_bkey_drop_device(k, dev_idx);
nr_good = bch2_bkey_durability(c, k.s_c);
if ((!nr_good && !(flags & lost)) ||
(nr_good < replicas && !(flags & degraded)))
return -EINVAL;
return 0;
}
static int bch2_dev_usrdata_drop(struct bch_fs *c, unsigned dev_idx, int flags)
{
struct btree_trans trans;
struct btree_iter *iter;
struct bkey_s_c k;
BKEY_PADDED(key) tmp;
int ret = 0;
bch2_trans_init(&trans, c);
bch2_trans_preload_iters(&trans);
iter = bch2_trans_get_iter(&trans, BTREE_ID_EXTENTS,
POS_MIN, BTREE_ITER_PREFETCH);
mutex_lock(&c->replicas_gc_lock);
bch2_replicas_gc_start(c, (1 << BCH_DATA_USER)|(1 << BCH_DATA_CACHED));
while ((k = bch2_btree_iter_peek(iter)).k &&
!(ret = bkey_err(k))) {
if (!bkey_extent_is_data(k.k) ||
!bch2_extent_has_device(bkey_s_c_to_extent(k), dev_idx)) {
ret = bch2_mark_bkey_replicas(c, k);
if (ret)
break;
bch2_btree_iter_next(iter);
continue;
}
bkey_reassemble(&tmp.key, k);
ret = drop_dev_ptrs(c, bkey_i_to_s(&tmp.key),
dev_idx, flags, false);
if (ret)
break;
/*
* If the new extent no longer has any pointers, bch2_extent_normalize()
* will do the appropriate thing with it (turning it into a
* KEY_TYPE_error key, or just a discard if it was a cached extent)
*/
bch2_extent_normalize(c, bkey_i_to_s(&tmp.key));
/* XXX not sketchy at all */
iter->pos = bkey_start_pos(&tmp.key.k);
bch2_trans_update(&trans, BTREE_INSERT_ENTRY(iter, &tmp.key));
ret = bch2_trans_commit(&trans, NULL, NULL,
BTREE_INSERT_ATOMIC|
BTREE_INSERT_NOFAIL);
/*
* don't want to leave ret == -EINTR, since if we raced and
* something else overwrote the key we could spuriously return
* -EINTR below:
*/
if (ret == -EINTR)
ret = 0;
if (ret)
break;
}
BUG_ON(ret == -EINTR);
bch2_trans_exit(&trans);
bch2_replicas_gc_end(c, ret);
mutex_unlock(&c->replicas_gc_lock);
return ret;
}
static int bch2_dev_metadata_drop(struct bch_fs *c, unsigned dev_idx, int flags)
{
struct btree_trans trans;
struct btree_iter *iter;
struct closure cl;
struct btree *b;
unsigned id;
int ret;
/* don't handle this yet: */
if (flags & BCH_FORCE_IF_METADATA_LOST)
return -EINVAL;
bch2_trans_init(&trans, c);
closure_init_stack(&cl);
mutex_lock(&c->replicas_gc_lock);
bch2_replicas_gc_start(c, 1 << BCH_DATA_BTREE);
for (id = 0; id < BTREE_ID_NR; id++) {
for_each_btree_node(&trans, iter, id, POS_MIN,
BTREE_ITER_PREFETCH, b) {
__BKEY_PADDED(k, BKEY_BTREE_PTR_VAL_U64s_MAX) tmp;
struct bkey_i_btree_ptr *new_key;
retry:
if (!bch2_bkey_has_device(bkey_i_to_s_c(&b->key),
dev_idx)) {
/*
* we might have found a btree node key we
* needed to update, and then tried to update it
* but got -EINTR after upgrading the iter, but
* then raced and the node is now gone:
*/
bch2_btree_iter_downgrade(iter);
ret = bch2_mark_bkey_replicas(c, bkey_i_to_s_c(&b->key));
if (ret)
goto err;
} else {
bkey_copy(&tmp.k, &b->key);
new_key = bkey_i_to_btree_ptr(&tmp.k);
ret = drop_dev_ptrs(c, bkey_i_to_s(&new_key->k_i),
dev_idx, flags, true);
if (ret)
goto err;
ret = bch2_btree_node_update_key(c, iter, b, new_key);
if (ret == -EINTR) {
b = bch2_btree_iter_peek_node(iter);
goto retry;
}
if (ret)
goto err;
}
}
bch2_trans_iter_free(&trans, iter);
}
/* flush relevant btree updates */
while (1) {
closure_wait_event(&c->btree_interior_update_wait,
!bch2_btree_interior_updates_nr_pending(c) ||
c->btree_roots_dirty);
if (!bch2_btree_interior_updates_nr_pending(c))
break;
bch2_journal_meta(&c->journal);
}
ret = 0;
err:
bch2_trans_exit(&trans);
ret = bch2_replicas_gc_end(c, ret);
mutex_unlock(&c->replicas_gc_lock);
return ret;
}
int bch2_dev_data_drop(struct bch_fs *c, unsigned dev_idx, int flags)
{
return bch2_dev_usrdata_drop(c, dev_idx, flags) ?:
bch2_dev_metadata_drop(c, dev_idx, flags);
}
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