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// SPDX-License-Identifier: GPL-2.0
/*
* Code for moving data off a device.
*/
#include "bcachefs.h"
#include "bkey_buf.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,
enum btree_id btree_id)
{
struct btree_trans trans;
struct btree_iter iter;
struct bkey_s_c k;
struct bkey_buf sk;
int ret = 0;
bch2_bkey_buf_init(&sk);
bch2_trans_init(&trans, c, BTREE_ITER_MAX, 0);
bch2_trans_iter_init(&trans, &iter, btree_id, POS_MIN,
BTREE_ITER_PREFETCH|
BTREE_ITER_ALL_SNAPSHOTS);
while ((bch2_trans_begin(&trans),
(k = bch2_btree_iter_peek(&iter)).k) &&
!(ret = bkey_err(k))) {
if (!bch2_bkey_has_device(k, dev_idx)) {
bch2_btree_iter_advance(&iter);
continue;
}
bch2_bkey_buf_reassemble(&sk, c, k);
ret = drop_dev_ptrs(c, bkey_i_to_s(sk.k),
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(sk.k));
/*
* Since we're not inserting through an extent iterator
* (BTREE_ITER_ALL_SNAPSHOTS iterators aren't extent iterators),
* we aren't using the extent overwrite path to delete, we're
* just using the normal key deletion path:
*/
if (bkey_deleted(&sk.k->k))
sk.k->k.size = 0;
ret = bch2_btree_iter_traverse(&iter) ?:
bch2_trans_update(&trans, &iter, sk.k,
BTREE_UPDATE_INTERNAL_SNAPSHOT_NODE) ?:
bch2_trans_commit(&trans, NULL, NULL,
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;
}
bch2_trans_iter_exit(&trans, &iter);
ret = bch2_trans_exit(&trans) ?: ret;
bch2_bkey_buf_exit(&sk, c);
BUG_ON(ret == -EINTR);
return ret;
}
static int bch2_dev_usrdata_drop(struct bch_fs *c, unsigned dev_idx, int flags)
{
return __bch2_dev_usrdata_drop(c, dev_idx, flags, BTREE_ID_extents) ?:
__bch2_dev_usrdata_drop(c, dev_idx, flags, BTREE_ID_reflink);
}
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;
struct bkey_buf k;
unsigned id;
int ret;
/* don't handle this yet: */
if (flags & BCH_FORCE_IF_METADATA_LOST)
return -EINVAL;
bch2_bkey_buf_init(&k);
bch2_trans_init(&trans, c, 0, 0);
closure_init_stack(&cl);
for (id = 0; id < BTREE_ID_NR; id++) {
bch2_trans_node_iter_init(&trans, &iter, id, POS_MIN, 0, 0,
BTREE_ITER_PREFETCH);
retry:
while (bch2_trans_begin(&trans),
(b = bch2_btree_iter_peek_node(&iter)) &&
!(ret = PTR_ERR_OR_ZERO(b))) {
if (!bch2_bkey_has_device(bkey_i_to_s_c(&b->key),
dev_idx))
goto next;
bch2_bkey_buf_copy(&k, c, &b->key);
ret = drop_dev_ptrs(c, bkey_i_to_s(k.k),
dev_idx, flags, true);
if (ret) {
bch_err(c, "Cannot drop device without losing data");
break;
}
ret = bch2_btree_node_update_key(&trans, &iter, b, k.k, false);
if (ret == -EINTR) {
ret = 0;
continue;
}
if (ret) {
bch_err(c, "Error updating btree node key: %i", ret);
break;
}
next:
bch2_btree_iter_next_node(&iter);
}
if (ret == -EINTR)
goto retry;
bch2_trans_iter_exit(&trans, &iter);
if (ret)
goto err;
}
/* flush relevant btree updates */
closure_wait_event(&c->btree_interior_update_wait,
!bch2_btree_interior_updates_nr_pending(c));
ret = 0;
err:
ret = bch2_trans_exit(&trans) ?: ret;
bch2_bkey_buf_exit(&k, c);
BUG_ON(ret == -EINTR);
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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