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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 "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_extent e,
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_extent_drop_device(e, dev_idx);
nr_good = bch2_extent_durability(c, e.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 bkey_s_c k;
struct bkey_s_extent e;
BKEY_PADDED(key) tmp;
struct btree_iter iter;
int ret = 0;
mutex_lock(&c->replicas_gc_lock);
bch2_replicas_gc_start(c, (1 << BCH_DATA_USER)|(1 << BCH_DATA_CACHED));
bch2_btree_iter_init(&iter, c, BTREE_ID_EXTENTS,
POS_MIN, BTREE_ITER_PREFETCH);
while ((k = bch2_btree_iter_peek(&iter)).k &&
!(ret = btree_iter_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, BCH_DATA_USER, k);
if (ret)
break;
bch2_btree_iter_next(&iter);
continue;
}
bkey_reassemble(&tmp.key, k);
e = bkey_i_to_s_extent(&tmp.key);
ret = drop_dev_ptrs(c, e, 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, e.s);
ret = bch2_mark_bkey_replicas(c, BCH_DATA_USER,
bkey_i_to_s_c(&tmp.key));
if (ret)
break;
iter.pos = bkey_start_pos(&tmp.key.k);
ret = bch2_btree_insert_at(c, NULL, NULL, NULL,
BTREE_INSERT_ATOMIC|
BTREE_INSERT_NOFAIL,
BTREE_INSERT_ENTRY(&iter, &tmp.key));
/*
* 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_btree_iter_unlock(&iter);
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_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;
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(&iter, c, id, POS_MIN, BTREE_ITER_PREFETCH, b) {
__BKEY_PADDED(k, BKEY_BTREE_PTR_VAL_U64s_MAX) tmp;
struct bkey_i_extent *new_key;
retry:
if (!bch2_extent_has_device(bkey_i_to_s_c_extent(&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, BCH_DATA_BTREE,
bkey_i_to_s_c(&b->key));
if (ret)
goto err;
} else {
bkey_copy(&tmp.k, &b->key);
new_key = bkey_i_to_extent(&tmp.k);
ret = drop_dev_ptrs(c, extent_i_to_s(new_key),
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_btree_iter_unlock(&iter);
}
ret = 0;
out:
ret = bch2_replicas_gc_end(c, ret);
mutex_unlock(&c->replicas_gc_lock);
return ret;
err:
bch2_btree_iter_unlock(&iter);
goto out;
}
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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