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-rw-r--r--fs/bcachefs/migrate.c179
1 files changed, 179 insertions, 0 deletions
diff --git a/fs/bcachefs/migrate.c b/fs/bcachefs/migrate.c
new file mode 100644
index 0000000000..e3a51f6d6c
--- /dev/null
+++ b/fs/bcachefs/migrate.c
@@ -0,0 +1,179 @@
+// 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);
+}