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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 "errcode.h"
#include "extents.h"
#include "io_write.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_key(struct btree_trans *trans,
struct btree_iter *iter,
struct bkey_s_c k,
unsigned dev_idx,
int flags)
{
struct bch_fs *c = trans->c;
struct bkey_i *n;
int ret;
if (!bch2_bkey_has_device_c(k, dev_idx))
return 0;
n = bch2_bkey_make_mut(trans, iter, &k, BTREE_UPDATE_INTERNAL_SNAPSHOT_NODE);
ret = PTR_ERR_OR_ZERO(n);
if (ret)
return ret;
ret = drop_dev_ptrs(c, bkey_i_to_s(n), dev_idx, flags, false);
if (ret)
return ret;
/*
* 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(n));
/*
* 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(&n->k))
n->k.size = 0;
return 0;
}
static int bch2_dev_usrdata_drop(struct bch_fs *c, unsigned dev_idx, int flags)
{
struct btree_trans *trans = bch2_trans_get(c);
struct btree_iter iter;
struct bkey_s_c k;
enum btree_id id;
int ret = 0;
for (id = 0; id < BTREE_ID_NR; id++) {
if (!btree_type_has_ptrs(id))
continue;
ret = for_each_btree_key_commit(trans, iter, id, POS_MIN,
BTREE_ITER_PREFETCH|BTREE_ITER_ALL_SNAPSHOTS, k,
NULL, NULL, BTREE_INSERT_NOFAIL,
bch2_dev_usrdata_drop_key(trans, &iter, k, dev_idx, flags));
if (ret)
break;
}
bch2_trans_put(trans);
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;
struct bkey_buf k;
unsigned id;
int ret;
/* don't handle this yet: */
if (flags & BCH_FORCE_IF_METADATA_LOST)
return -EINVAL;
trans = bch2_trans_get(c);
bch2_bkey_buf_init(&k);
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:
ret = 0;
while (bch2_trans_begin(trans),
(b = bch2_btree_iter_peek_node(&iter)) &&
!(ret = PTR_ERR_OR_ZERO(b))) {
if (!bch2_bkey_has_device_c(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, 0, false);
if (bch2_err_matches(ret, BCH_ERR_transaction_restart)) {
ret = 0;
continue;
}
if (ret) {
bch_err_msg(c, ret, "updating btree node key");
break;
}
next:
bch2_btree_iter_next_node(&iter);
}
if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
goto retry;
bch2_trans_iter_exit(trans, &iter);
if (ret)
goto err;
}
bch2_btree_interior_updates_flush(c);
ret = 0;
err:
bch2_bkey_buf_exit(&k, c);
bch2_trans_put(trans);
BUG_ON(bch2_err_matches(ret, BCH_ERR_transaction_restart));
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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