diff options
Diffstat (limited to 'fs/bcachefs/migrate.c')
| -rw-r--r-- | fs/bcachefs/migrate.c | 179 |
1 files changed, 179 insertions, 0 deletions
diff --git a/fs/bcachefs/migrate.c b/fs/bcachefs/migrate.c new file mode 100644 index 000000000000..e3a51f6d6c9b --- /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); +} |