bcachefs: Initial commit
Initially forked from drivers/md/bcache, bcachefs is a new copy-on-write
filesystem with every feature you could possibly want.
Website: https://bcachefs.org
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
diff --git a/fs/bcachefs/move.c b/fs/bcachefs/move.c
new file mode 100644
index 0000000..b6310a6
--- /dev/null
+++ b/fs/bcachefs/move.c
@@ -0,0 +1,761 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include "bcachefs.h"
+#include "btree_gc.h"
+#include "btree_update.h"
+#include "buckets.h"
+#include "inode.h"
+#include "io.h"
+#include "journal_reclaim.h"
+#include "keylist.h"
+#include "move.h"
+#include "replicas.h"
+#include "super-io.h"
+#include "trace.h"
+
+#include <linux/ioprio.h>
+#include <linux/kthread.h>
+
+#define SECTORS_IN_FLIGHT_PER_DEVICE 2048
+
+struct moving_io {
+ struct list_head list;
+ struct closure cl;
+ bool read_completed;
+
+ unsigned read_sectors;
+ unsigned write_sectors;
+
+ struct bch_read_bio rbio;
+
+ struct migrate_write write;
+ /* Must be last since it is variable size */
+ struct bio_vec bi_inline_vecs[0];
+};
+
+struct moving_context {
+ /* Closure for waiting on all reads and writes to complete */
+ struct closure cl;
+
+ struct bch_move_stats *stats;
+
+ struct list_head reads;
+
+ /* in flight sectors: */
+ atomic_t read_sectors;
+ atomic_t write_sectors;
+
+ wait_queue_head_t wait;
+};
+
+static int bch2_migrate_index_update(struct bch_write_op *op)
+{
+ struct bch_fs *c = op->c;
+ struct migrate_write *m =
+ container_of(op, struct migrate_write, op);
+ struct keylist *keys = &op->insert_keys;
+ struct btree_iter iter;
+ int ret = 0;
+
+ bch2_btree_iter_init(&iter, c, BTREE_ID_EXTENTS,
+ bkey_start_pos(&bch2_keylist_front(keys)->k),
+ BTREE_ITER_SLOTS|BTREE_ITER_INTENT);
+
+ while (1) {
+ struct bkey_s_c k = bch2_btree_iter_peek_slot(&iter);
+ struct bkey_i_extent *insert, *new =
+ bkey_i_to_extent(bch2_keylist_front(keys));
+ BKEY_PADDED(k) _new, _insert;
+ struct bch_extent_ptr *ptr;
+ struct bch_extent_crc_unpacked crc;
+ bool did_work = false;
+ int nr;
+
+ if (btree_iter_err(k)) {
+ ret = bch2_btree_iter_unlock(&iter);
+ break;
+ }
+
+ if (bversion_cmp(k.k->version, new->k.version) ||
+ !bkey_extent_is_data(k.k) ||
+ !bch2_extent_matches_ptr(c, bkey_s_c_to_extent(k),
+ m->ptr, m->offset))
+ goto nomatch;
+
+ if (m->data_cmd == DATA_REWRITE &&
+ !bch2_extent_has_device(bkey_s_c_to_extent(k),
+ m->data_opts.rewrite_dev))
+ goto nomatch;
+
+ bkey_reassemble(&_insert.k, k);
+ insert = bkey_i_to_extent(&_insert.k);
+
+ bkey_copy(&_new.k, bch2_keylist_front(keys));
+ new = bkey_i_to_extent(&_new.k);
+
+ bch2_cut_front(iter.pos, &insert->k_i);
+ bch2_cut_back(new->k.p, &insert->k);
+ bch2_cut_back(insert->k.p, &new->k);
+
+ if (m->data_cmd == DATA_REWRITE) {
+ ptr = (struct bch_extent_ptr *)
+ bch2_extent_has_device(extent_i_to_s_c(insert),
+ m->data_opts.rewrite_dev);
+ bch2_extent_drop_ptr(extent_i_to_s(insert), ptr);
+ }
+
+ extent_for_each_ptr_crc(extent_i_to_s(new), ptr, crc) {
+ if (bch2_extent_has_device(extent_i_to_s_c(insert), ptr->dev)) {
+ /*
+ * raced with another move op? extent already
+ * has a pointer to the device we just wrote
+ * data to
+ */
+ continue;
+ }
+
+ bch2_extent_crc_append(insert, crc);
+ extent_ptr_append(insert, *ptr);
+ did_work = true;
+ }
+
+ if (!did_work)
+ goto nomatch;
+
+ bch2_extent_narrow_crcs(insert,
+ (struct bch_extent_crc_unpacked) { 0 });
+ bch2_extent_normalize(c, extent_i_to_s(insert).s);
+ bch2_extent_mark_replicas_cached(c, extent_i_to_s(insert),
+ op->opts.background_target,
+ op->opts.data_replicas);
+
+ /*
+ * It's possible we race, and for whatever reason the extent now
+ * has fewer replicas than when we last looked at it - meaning
+ * we need to get a disk reservation here:
+ */
+ nr = bch2_extent_nr_dirty_ptrs(bkey_i_to_s_c(&insert->k_i)) -
+ (bch2_extent_nr_dirty_ptrs(k) + m->nr_ptrs_reserved);
+ if (nr > 0) {
+ /*
+ * can't call bch2_disk_reservation_add() with btree
+ * locks held, at least not without a song and dance
+ */
+ bch2_btree_iter_unlock(&iter);
+
+ ret = bch2_disk_reservation_add(c, &op->res,
+ keylist_sectors(keys) * nr, 0);
+ if (ret)
+ goto out;
+
+ m->nr_ptrs_reserved += nr;
+ goto next;
+ }
+
+ ret = bch2_mark_bkey_replicas(c, BCH_DATA_USER,
+ extent_i_to_s_c(insert).s_c);
+ if (ret)
+ break;
+
+ ret = bch2_btree_insert_at(c, &op->res,
+ NULL, op_journal_seq(op),
+ BTREE_INSERT_ATOMIC|
+ BTREE_INSERT_NOFAIL|
+ BTREE_INSERT_USE_RESERVE|
+ m->data_opts.btree_insert_flags,
+ BTREE_INSERT_ENTRY(&iter, &insert->k_i));
+ if (!ret)
+ atomic_long_inc(&c->extent_migrate_done);
+ if (ret == -EINTR)
+ ret = 0;
+ if (ret)
+ break;
+next:
+ while (bkey_cmp(iter.pos, bch2_keylist_front(keys)->k.p) >= 0) {
+ bch2_keylist_pop_front(keys);
+ if (bch2_keylist_empty(keys))
+ goto out;
+ }
+
+ bch2_cut_front(iter.pos, bch2_keylist_front(keys));
+ continue;
+nomatch:
+ if (m->ctxt)
+ atomic64_add(k.k->p.offset - iter.pos.offset,
+ &m->ctxt->stats->sectors_raced);
+ atomic_long_inc(&c->extent_migrate_raced);
+ trace_move_race(&new->k);
+ bch2_btree_iter_next_slot(&iter);
+ goto next;
+ }
+out:
+ bch2_btree_iter_unlock(&iter);
+ return ret;
+}
+
+void bch2_migrate_read_done(struct migrate_write *m, struct bch_read_bio *rbio)
+{
+ /* write bio must own pages: */
+ BUG_ON(!m->op.wbio.bio.bi_vcnt);
+
+ m->ptr = rbio->pick.ptr;
+ m->offset = rbio->pos.offset - rbio->pick.crc.offset;
+ m->op.devs_have = rbio->devs_have;
+ m->op.pos = rbio->pos;
+ m->op.version = rbio->version;
+ m->op.crc = rbio->pick.crc;
+ m->op.wbio.bio.bi_iter.bi_size = m->op.crc.compressed_size << 9;
+
+ if (bch2_csum_type_is_encryption(m->op.crc.csum_type)) {
+ m->op.nonce = m->op.crc.nonce + m->op.crc.offset;
+ m->op.csum_type = m->op.crc.csum_type;
+ }
+
+ if (m->data_cmd == DATA_REWRITE)
+ bch2_dev_list_drop_dev(&m->op.devs_have, m->data_opts.rewrite_dev);
+}
+
+int bch2_migrate_write_init(struct bch_fs *c, struct migrate_write *m,
+ struct write_point_specifier wp,
+ struct bch_io_opts io_opts,
+ enum data_cmd data_cmd,
+ struct data_opts data_opts,
+ struct bkey_s_c k)
+{
+ int ret;
+
+ m->data_cmd = data_cmd;
+ m->data_opts = data_opts;
+ m->nr_ptrs_reserved = 0;
+
+ bch2_write_op_init(&m->op, c, io_opts);
+ m->op.compression_type =
+ bch2_compression_opt_to_type[io_opts.background_compression ?:
+ io_opts.compression];
+ m->op.target = data_opts.target,
+ m->op.write_point = wp;
+
+ if (m->data_opts.btree_insert_flags & BTREE_INSERT_USE_RESERVE)
+ m->op.alloc_reserve = RESERVE_MOVINGGC;
+
+ m->op.flags |= BCH_WRITE_ONLY_SPECIFIED_DEVS|
+ BCH_WRITE_PAGES_STABLE|
+ BCH_WRITE_PAGES_OWNED|
+ BCH_WRITE_DATA_ENCODED|
+ BCH_WRITE_NOMARK_REPLICAS;
+
+ m->op.nr_replicas = 1;
+ m->op.nr_replicas_required = 1;
+ m->op.index_update_fn = bch2_migrate_index_update;
+
+ switch (data_cmd) {
+ case DATA_ADD_REPLICAS: {
+ int nr = (int) io_opts.data_replicas -
+ bch2_extent_nr_dirty_ptrs(k);
+
+ if (nr > 0) {
+ m->op.nr_replicas = m->nr_ptrs_reserved = nr;
+
+ ret = bch2_disk_reservation_get(c, &m->op.res,
+ k.k->size, m->op.nr_replicas, 0);
+ if (ret)
+ return ret;
+ }
+ break;
+ }
+ case DATA_REWRITE:
+ break;
+ case DATA_PROMOTE:
+ m->op.flags |= BCH_WRITE_ALLOC_NOWAIT;
+ m->op.flags |= BCH_WRITE_CACHED;
+ break;
+ default:
+ BUG();
+ }
+
+ return 0;
+}
+
+static void move_free(struct closure *cl)
+{
+ struct moving_io *io = container_of(cl, struct moving_io, cl);
+ struct moving_context *ctxt = io->write.ctxt;
+ struct bvec_iter_all iter;
+ struct bio_vec *bv;
+
+ bch2_disk_reservation_put(io->write.op.c, &io->write.op.res);
+
+ bio_for_each_segment_all(bv, &io->write.op.wbio.bio, iter)
+ if (bv->bv_page)
+ __free_page(bv->bv_page);
+
+ wake_up(&ctxt->wait);
+
+ kfree(io);
+}
+
+static void move_write_done(struct closure *cl)
+{
+ struct moving_io *io = container_of(cl, struct moving_io, cl);
+
+ atomic_sub(io->write_sectors, &io->write.ctxt->write_sectors);
+ closure_return_with_destructor(cl, move_free);
+}
+
+static void move_write(struct closure *cl)
+{
+ struct moving_io *io = container_of(cl, struct moving_io, cl);
+
+ if (unlikely(io->rbio.bio.bi_status || io->rbio.hole)) {
+ closure_return_with_destructor(cl, move_free);
+ return;
+ }
+
+ bch2_migrate_read_done(&io->write, &io->rbio);
+
+ atomic_add(io->write_sectors, &io->write.ctxt->write_sectors);
+ closure_call(&io->write.op.cl, bch2_write, NULL, cl);
+ continue_at(cl, move_write_done, NULL);
+}
+
+static inline struct moving_io *next_pending_write(struct moving_context *ctxt)
+{
+ struct moving_io *io =
+ list_first_entry_or_null(&ctxt->reads, struct moving_io, list);
+
+ return io && io->read_completed ? io : NULL;
+}
+
+static void move_read_endio(struct bio *bio)
+{
+ struct moving_io *io = container_of(bio, struct moving_io, rbio.bio);
+ struct moving_context *ctxt = io->write.ctxt;
+
+ atomic_sub(io->read_sectors, &ctxt->read_sectors);
+ io->read_completed = true;
+
+ if (next_pending_write(ctxt))
+ wake_up(&ctxt->wait);
+
+ closure_put(&ctxt->cl);
+}
+
+static void do_pending_writes(struct moving_context *ctxt)
+{
+ struct moving_io *io;
+
+ while ((io = next_pending_write(ctxt))) {
+ list_del(&io->list);
+ closure_call(&io->cl, move_write, NULL, &ctxt->cl);
+ }
+}
+
+#define move_ctxt_wait_event(_ctxt, _cond) \
+do { \
+ do_pending_writes(_ctxt); \
+ \
+ if (_cond) \
+ break; \
+ __wait_event((_ctxt)->wait, \
+ next_pending_write(_ctxt) || (_cond)); \
+} while (1)
+
+static void bch2_move_ctxt_wait_for_io(struct moving_context *ctxt)
+{
+ unsigned sectors_pending = atomic_read(&ctxt->write_sectors);
+
+ move_ctxt_wait_event(ctxt,
+ !atomic_read(&ctxt->write_sectors) ||
+ atomic_read(&ctxt->write_sectors) != sectors_pending);
+}
+
+static int bch2_move_extent(struct bch_fs *c,
+ struct moving_context *ctxt,
+ struct write_point_specifier wp,
+ struct bch_io_opts io_opts,
+ struct bkey_s_c_extent e,
+ enum data_cmd data_cmd,
+ struct data_opts data_opts)
+{
+ struct moving_io *io;
+ const struct bch_extent_ptr *ptr;
+ struct bch_extent_crc_unpacked crc;
+ unsigned sectors = e.k->size, pages;
+ int ret = -ENOMEM;
+
+ move_ctxt_wait_event(ctxt,
+ atomic_read(&ctxt->write_sectors) <
+ SECTORS_IN_FLIGHT_PER_DEVICE);
+
+ move_ctxt_wait_event(ctxt,
+ atomic_read(&ctxt->read_sectors) <
+ SECTORS_IN_FLIGHT_PER_DEVICE);
+
+ /* write path might have to decompress data: */
+ extent_for_each_ptr_crc(e, ptr, crc)
+ sectors = max_t(unsigned, sectors, crc.uncompressed_size);
+
+ pages = DIV_ROUND_UP(sectors, PAGE_SECTORS);
+ io = kzalloc(sizeof(struct moving_io) +
+ sizeof(struct bio_vec) * pages, GFP_KERNEL);
+ if (!io)
+ goto err;
+
+ io->write.ctxt = ctxt;
+ io->read_sectors = e.k->size;
+ io->write_sectors = e.k->size;
+
+ bio_init(&io->write.op.wbio.bio, NULL, io->bi_inline_vecs, pages, 0);
+ bio_set_prio(&io->write.op.wbio.bio,
+ IOPRIO_PRIO_VALUE(IOPRIO_CLASS_IDLE, 0));
+
+ if (bch2_bio_alloc_pages(&io->write.op.wbio.bio, sectors << 9,
+ GFP_KERNEL))
+ goto err_free;
+
+ io->rbio.opts = io_opts;
+ bio_init(&io->rbio.bio, NULL, io->bi_inline_vecs, pages, 0);
+ io->rbio.bio.bi_vcnt = pages;
+ bio_set_prio(&io->rbio.bio, IOPRIO_PRIO_VALUE(IOPRIO_CLASS_IDLE, 0));
+ io->rbio.bio.bi_iter.bi_size = sectors << 9;
+
+ io->rbio.bio.bi_opf = REQ_OP_READ;
+ io->rbio.bio.bi_iter.bi_sector = bkey_start_offset(e.k);
+ io->rbio.bio.bi_end_io = move_read_endio;
+
+ ret = bch2_migrate_write_init(c, &io->write, wp, io_opts,
+ data_cmd, data_opts, e.s_c);
+ if (ret)
+ goto err_free_pages;
+
+ atomic64_inc(&ctxt->stats->keys_moved);
+ atomic64_add(e.k->size, &ctxt->stats->sectors_moved);
+
+ trace_move_extent(e.k);
+
+ atomic_add(io->read_sectors, &ctxt->read_sectors);
+ list_add_tail(&io->list, &ctxt->reads);
+
+ /*
+ * dropped by move_read_endio() - guards against use after free of
+ * ctxt when doing wakeup
+ */
+ closure_get(&ctxt->cl);
+ bch2_read_extent(c, &io->rbio, e.s_c,
+ BCH_READ_NODECODE|
+ BCH_READ_LAST_FRAGMENT);
+ return 0;
+err_free_pages:
+ bio_free_pages(&io->write.op.wbio.bio);
+err_free:
+ kfree(io);
+err:
+ trace_move_alloc_fail(e.k);
+ return ret;
+}
+
+int bch2_move_data(struct bch_fs *c,
+ struct bch_ratelimit *rate,
+ struct write_point_specifier wp,
+ struct bpos start,
+ struct bpos end,
+ move_pred_fn pred, void *arg,
+ struct bch_move_stats *stats)
+{
+ bool kthread = (current->flags & PF_KTHREAD) != 0;
+ struct moving_context ctxt = { .stats = stats };
+ struct bch_io_opts io_opts = bch2_opts_to_inode_opts(c->opts);
+ BKEY_PADDED(k) tmp;
+ struct bkey_s_c k;
+ struct bkey_s_c_extent e;
+ struct data_opts data_opts;
+ enum data_cmd data_cmd;
+ u64 cur_inum = U64_MAX;
+ int ret = 0, ret2;
+
+ closure_init_stack(&ctxt.cl);
+ INIT_LIST_HEAD(&ctxt.reads);
+ init_waitqueue_head(&ctxt.wait);
+
+ stats->data_type = BCH_DATA_USER;
+ bch2_btree_iter_init(&stats->iter, c, BTREE_ID_EXTENTS, start,
+ BTREE_ITER_PREFETCH);
+
+ if (rate)
+ bch2_ratelimit_reset(rate);
+
+ while (!kthread || !(ret = kthread_should_stop())) {
+ if (rate &&
+ bch2_ratelimit_delay(rate) &&
+ (bch2_btree_iter_unlock(&stats->iter),
+ (ret = bch2_ratelimit_wait_freezable_stoppable(rate))))
+ break;
+peek:
+ k = bch2_btree_iter_peek(&stats->iter);
+ if (!k.k)
+ break;
+ ret = btree_iter_err(k);
+ if (ret)
+ break;
+ if (bkey_cmp(bkey_start_pos(k.k), end) >= 0)
+ break;
+
+ if (!bkey_extent_is_data(k.k))
+ goto next_nondata;
+
+ e = bkey_s_c_to_extent(k);
+
+ if (cur_inum != k.k->p.inode) {
+ struct bch_inode_unpacked inode;
+
+ /* don't hold btree locks while looking up inode: */
+ bch2_btree_iter_unlock(&stats->iter);
+
+ io_opts = bch2_opts_to_inode_opts(c->opts);
+ if (!bch2_inode_find_by_inum(c, k.k->p.inode, &inode))
+ bch2_io_opts_apply(&io_opts, bch2_inode_opts_get(&inode));
+ cur_inum = k.k->p.inode;
+ goto peek;
+ }
+
+ switch ((data_cmd = pred(c, arg, BKEY_TYPE_EXTENTS, e,
+ &io_opts, &data_opts))) {
+ case DATA_SKIP:
+ goto next;
+ case DATA_SCRUB:
+ BUG();
+ case DATA_ADD_REPLICAS:
+ case DATA_REWRITE:
+ case DATA_PROMOTE:
+ break;
+ default:
+ BUG();
+ }
+
+ /* unlock before doing IO: */
+ bkey_reassemble(&tmp.k, k);
+ k = bkey_i_to_s_c(&tmp.k);
+ bch2_btree_iter_unlock(&stats->iter);
+
+ ret2 = bch2_move_extent(c, &ctxt, wp, io_opts,
+ bkey_s_c_to_extent(k),
+ data_cmd, data_opts);
+ if (ret2) {
+ if (ret2 == -ENOMEM) {
+ /* memory allocation failure, wait for some IO to finish */
+ bch2_move_ctxt_wait_for_io(&ctxt);
+ continue;
+ }
+
+ /* XXX signal failure */
+ goto next;
+ }
+
+ if (rate)
+ bch2_ratelimit_increment(rate, k.k->size);
+next:
+ atomic64_add(k.k->size * bch2_extent_nr_dirty_ptrs(k),
+ &stats->sectors_seen);
+next_nondata:
+ bch2_btree_iter_next(&stats->iter);
+ bch2_btree_iter_cond_resched(&stats->iter);
+ }
+
+ bch2_btree_iter_unlock(&stats->iter);
+
+ move_ctxt_wait_event(&ctxt, list_empty(&ctxt.reads));
+ closure_sync(&ctxt.cl);
+
+ EBUG_ON(atomic_read(&ctxt.write_sectors));
+
+ trace_move_data(c,
+ atomic64_read(&stats->sectors_moved),
+ atomic64_read(&stats->keys_moved));
+
+ return ret;
+}
+
+static int bch2_gc_data_replicas(struct bch_fs *c)
+{
+ struct btree_iter iter;
+ struct bkey_s_c k;
+ int ret;
+
+ mutex_lock(&c->replicas_gc_lock);
+ bch2_replicas_gc_start(c, (1 << BCH_DATA_USER)|(1 << BCH_DATA_CACHED));
+
+ for_each_btree_key(&iter, c, BTREE_ID_EXTENTS, POS_MIN,
+ BTREE_ITER_PREFETCH, k) {
+ ret = bch2_mark_bkey_replicas(c, BCH_DATA_USER, k);
+ if (ret)
+ break;
+ }
+ ret = bch2_btree_iter_unlock(&iter) ?: ret;
+
+ bch2_replicas_gc_end(c, ret);
+ mutex_unlock(&c->replicas_gc_lock);
+
+ return ret;
+}
+
+static int bch2_gc_btree_replicas(struct bch_fs *c)
+{
+ struct btree_iter iter;
+ struct btree *b;
+ unsigned id;
+ int ret = 0;
+
+ 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) {
+ ret = bch2_mark_bkey_replicas(c, BCH_DATA_BTREE,
+ bkey_i_to_s_c(&b->key));
+
+ bch2_btree_iter_cond_resched(&iter);
+ }
+
+ ret = bch2_btree_iter_unlock(&iter) ?: ret;
+ }
+
+ bch2_replicas_gc_end(c, ret);
+ mutex_unlock(&c->replicas_gc_lock);
+
+ return ret;
+}
+
+static int bch2_move_btree(struct bch_fs *c,
+ move_pred_fn pred,
+ void *arg,
+ struct bch_move_stats *stats)
+{
+ struct bch_io_opts io_opts = bch2_opts_to_inode_opts(c->opts);
+ struct btree *b;
+ unsigned id;
+ struct data_opts data_opts;
+ enum data_cmd cmd;
+ int ret = 0;
+
+ stats->data_type = BCH_DATA_BTREE;
+
+ for (id = 0; id < BTREE_ID_NR; id++) {
+ for_each_btree_node(&stats->iter, c, id, POS_MIN, BTREE_ITER_PREFETCH, b) {
+ switch ((cmd = pred(c, arg, BKEY_TYPE_BTREE,
+ bkey_i_to_s_c_extent(&b->key),
+ &io_opts,
+ &data_opts))) {
+ case DATA_SKIP:
+ goto next;
+ case DATA_SCRUB:
+ BUG();
+ case DATA_ADD_REPLICAS:
+ case DATA_REWRITE:
+ break;
+ default:
+ BUG();
+ }
+
+ ret = bch2_btree_node_rewrite(c, &stats->iter,
+ b->data->keys.seq, 0) ?: ret;
+next:
+ bch2_btree_iter_cond_resched(&stats->iter);
+ }
+
+ ret = bch2_btree_iter_unlock(&stats->iter) ?: ret;
+ }
+
+ return ret;
+}
+
+#if 0
+static enum data_cmd scrub_pred(struct bch_fs *c, void *arg,
+ enum bkey_type type,
+ struct bkey_s_c_extent e,
+ struct bch_io_opts *io_opts,
+ struct data_opts *data_opts)
+{
+ return DATA_SCRUB;
+}
+#endif
+
+static enum data_cmd rereplicate_pred(struct bch_fs *c, void *arg,
+ enum bkey_type type,
+ struct bkey_s_c_extent e,
+ struct bch_io_opts *io_opts,
+ struct data_opts *data_opts)
+{
+ unsigned nr_good = bch2_extent_durability(c, e);
+ unsigned replicas = type == BKEY_TYPE_BTREE
+ ? c->opts.metadata_replicas
+ : io_opts->data_replicas;
+
+ if (!nr_good || nr_good >= replicas)
+ return DATA_SKIP;
+
+ data_opts->target = 0;
+ data_opts->btree_insert_flags = 0;
+ return DATA_ADD_REPLICAS;
+}
+
+static enum data_cmd migrate_pred(struct bch_fs *c, void *arg,
+ enum bkey_type type,
+ struct bkey_s_c_extent e,
+ struct bch_io_opts *io_opts,
+ struct data_opts *data_opts)
+{
+ struct bch_ioctl_data *op = arg;
+
+ if (!bch2_extent_has_device(e, op->migrate.dev))
+ return DATA_SKIP;
+
+ data_opts->target = 0;
+ data_opts->btree_insert_flags = 0;
+ data_opts->rewrite_dev = op->migrate.dev;
+ return DATA_REWRITE;
+}
+
+int bch2_data_job(struct bch_fs *c,
+ struct bch_move_stats *stats,
+ struct bch_ioctl_data op)
+{
+ int ret = 0;
+
+ switch (op.op) {
+ case BCH_DATA_OP_REREPLICATE:
+ stats->data_type = BCH_DATA_JOURNAL;
+ ret = bch2_journal_flush_device_pins(&c->journal, -1);
+
+ ret = bch2_move_btree(c, rereplicate_pred, c, stats) ?: ret;
+ ret = bch2_gc_btree_replicas(c) ?: ret;
+
+ ret = bch2_move_data(c, NULL,
+ writepoint_hashed((unsigned long) current),
+ op.start,
+ op.end,
+ rereplicate_pred, c, stats) ?: ret;
+ ret = bch2_gc_data_replicas(c) ?: ret;
+ break;
+ case BCH_DATA_OP_MIGRATE:
+ if (op.migrate.dev >= c->sb.nr_devices)
+ return -EINVAL;
+
+ stats->data_type = BCH_DATA_JOURNAL;
+ ret = bch2_journal_flush_device_pins(&c->journal, op.migrate.dev);
+
+ ret = bch2_move_btree(c, migrate_pred, &op, stats) ?: ret;
+ ret = bch2_gc_btree_replicas(c) ?: ret;
+
+ ret = bch2_move_data(c, NULL,
+ writepoint_hashed((unsigned long) current),
+ op.start,
+ op.end,
+ migrate_pred, &op, stats) ?: ret;
+ ret = bch2_gc_data_replicas(c) ?: ret;
+ break;
+ default:
+ ret = -EINVAL;
+ }
+
+ return ret;
+}
