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-rw-r--r--fs/bcachefs/move.c1154
1 files changed, 1154 insertions, 0 deletions
diff --git a/fs/bcachefs/move.c b/fs/bcachefs/move.c
new file mode 100644
index 0000000000..f3dac4511a
--- /dev/null
+++ b/fs/bcachefs/move.c
@@ -0,0 +1,1154 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include "bcachefs.h"
+#include "alloc_background.h"
+#include "alloc_foreground.h"
+#include "backpointers.h"
+#include "bkey_buf.h"
+#include "btree_gc.h"
+#include "btree_update.h"
+#include "btree_update_interior.h"
+#include "btree_write_buffer.h"
+#include "disk_groups.h"
+#include "ec.h"
+#include "errcode.h"
+#include "error.h"
+#include "inode.h"
+#include "io_read.h"
+#include "io_write.h"
+#include "journal_reclaim.h"
+#include "keylist.h"
+#include "move.h"
+#include "replicas.h"
+#include "snapshot.h"
+#include "super-io.h"
+#include "trace.h"
+
+#include <linux/ioprio.h>
+#include <linux/kthread.h>
+
+static void trace_move_extent2(struct bch_fs *c, struct bkey_s_c k)
+{
+ if (trace_move_extent_enabled()) {
+ struct printbuf buf = PRINTBUF;
+
+ bch2_bkey_val_to_text(&buf, c, k);
+ trace_move_extent(c, buf.buf);
+ printbuf_exit(&buf);
+ }
+}
+
+static void trace_move_extent_read2(struct bch_fs *c, struct bkey_s_c k)
+{
+ if (trace_move_extent_read_enabled()) {
+ struct printbuf buf = PRINTBUF;
+
+ bch2_bkey_val_to_text(&buf, c, k);
+ trace_move_extent_read(c, buf.buf);
+ printbuf_exit(&buf);
+ }
+}
+
+struct moving_io {
+ struct list_head read_list;
+ struct list_head io_list;
+ struct move_bucket_in_flight *b;
+ struct closure cl;
+ bool read_completed;
+
+ unsigned read_sectors;
+ unsigned write_sectors;
+
+ struct bch_read_bio rbio;
+
+ struct data_update write;
+ /* Must be last since it is variable size */
+ struct bio_vec bi_inline_vecs[0];
+};
+
+static void move_free(struct moving_io *io)
+{
+ struct moving_context *ctxt = io->write.ctxt;
+
+ if (io->b)
+ atomic_dec(&io->b->count);
+
+ bch2_data_update_exit(&io->write);
+
+ mutex_lock(&ctxt->lock);
+ list_del(&io->io_list);
+ wake_up(&ctxt->wait);
+ mutex_unlock(&ctxt->lock);
+
+ kfree(io);
+}
+
+static void move_write_done(struct bch_write_op *op)
+{
+ struct moving_io *io = container_of(op, struct moving_io, write.op);
+ struct moving_context *ctxt = io->write.ctxt;
+
+ if (io->write.op.error)
+ ctxt->write_error = true;
+
+ atomic_sub(io->write_sectors, &io->write.ctxt->write_sectors);
+ atomic_dec(&io->write.ctxt->write_ios);
+ move_free(io);
+ closure_put(&ctxt->cl);
+}
+
+static void move_write(struct moving_io *io)
+{
+ if (unlikely(io->rbio.bio.bi_status || io->rbio.hole)) {
+ move_free(io);
+ return;
+ }
+
+ closure_get(&io->write.ctxt->cl);
+ atomic_add(io->write_sectors, &io->write.ctxt->write_sectors);
+ atomic_inc(&io->write.ctxt->write_ios);
+
+ bch2_data_update_read_done(&io->write, io->rbio.pick.crc);
+}
+
+struct moving_io *bch2_moving_ctxt_next_pending_write(struct moving_context *ctxt)
+{
+ struct moving_io *io =
+ list_first_entry_or_null(&ctxt->reads, struct moving_io, read_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);
+ atomic_dec(&ctxt->read_ios);
+ io->read_completed = true;
+
+ wake_up(&ctxt->wait);
+ closure_put(&ctxt->cl);
+}
+
+void bch2_moving_ctxt_do_pending_writes(struct moving_context *ctxt)
+{
+ struct moving_io *io;
+
+ while ((io = bch2_moving_ctxt_next_pending_write(ctxt))) {
+ bch2_trans_unlock_long(ctxt->trans);
+ list_del(&io->read_list);
+ move_write(io);
+ }
+}
+
+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);
+}
+
+void bch2_moving_ctxt_flush_all(struct moving_context *ctxt)
+{
+ move_ctxt_wait_event(ctxt, list_empty(&ctxt->reads));
+ bch2_trans_unlock_long(ctxt->trans);
+ closure_sync(&ctxt->cl);
+}
+
+void bch2_moving_ctxt_exit(struct moving_context *ctxt)
+{
+ struct bch_fs *c = ctxt->trans->c;
+
+ bch2_moving_ctxt_flush_all(ctxt);
+
+ EBUG_ON(atomic_read(&ctxt->write_sectors));
+ EBUG_ON(atomic_read(&ctxt->write_ios));
+ EBUG_ON(atomic_read(&ctxt->read_sectors));
+ EBUG_ON(atomic_read(&ctxt->read_ios));
+
+ mutex_lock(&c->moving_context_lock);
+ list_del(&ctxt->list);
+ mutex_unlock(&c->moving_context_lock);
+
+ bch2_trans_put(ctxt->trans);
+ memset(ctxt, 0, sizeof(*ctxt));
+}
+
+void bch2_moving_ctxt_init(struct moving_context *ctxt,
+ struct bch_fs *c,
+ struct bch_ratelimit *rate,
+ struct bch_move_stats *stats,
+ struct write_point_specifier wp,
+ bool wait_on_copygc)
+{
+ memset(ctxt, 0, sizeof(*ctxt));
+
+ ctxt->trans = bch2_trans_get(c);
+ ctxt->fn = (void *) _RET_IP_;
+ ctxt->rate = rate;
+ ctxt->stats = stats;
+ ctxt->wp = wp;
+ ctxt->wait_on_copygc = wait_on_copygc;
+
+ closure_init_stack(&ctxt->cl);
+
+ mutex_init(&ctxt->lock);
+ INIT_LIST_HEAD(&ctxt->reads);
+ INIT_LIST_HEAD(&ctxt->ios);
+ init_waitqueue_head(&ctxt->wait);
+
+ mutex_lock(&c->moving_context_lock);
+ list_add(&ctxt->list, &c->moving_context_list);
+ mutex_unlock(&c->moving_context_lock);
+}
+
+void bch2_move_stats_exit(struct bch_move_stats *stats, struct bch_fs *c)
+{
+ trace_move_data(c, stats);
+}
+
+void bch2_move_stats_init(struct bch_move_stats *stats, char *name)
+{
+ memset(stats, 0, sizeof(*stats));
+ stats->data_type = BCH_DATA_user;
+ scnprintf(stats->name, sizeof(stats->name), "%s", name);
+}
+
+int bch2_move_extent(struct moving_context *ctxt,
+ struct move_bucket_in_flight *bucket_in_flight,
+ struct btree_iter *iter,
+ struct bkey_s_c k,
+ struct bch_io_opts io_opts,
+ struct data_update_opts data_opts)
+{
+ struct btree_trans *trans = ctxt->trans;
+ struct bch_fs *c = trans->c;
+ struct bkey_ptrs_c ptrs = bch2_bkey_ptrs_c(k);
+ struct moving_io *io;
+ const union bch_extent_entry *entry;
+ struct extent_ptr_decoded p;
+ unsigned sectors = k.k->size, pages;
+ int ret = -ENOMEM;
+
+ if (ctxt->stats)
+ ctxt->stats->pos = BBPOS(iter->btree_id, iter->pos);
+ trace_move_extent2(c, k);
+
+ bch2_data_update_opts_normalize(k, &data_opts);
+
+ if (!data_opts.rewrite_ptrs &&
+ !data_opts.extra_replicas) {
+ if (data_opts.kill_ptrs)
+ return bch2_extent_drop_ptrs(trans, iter, k, data_opts);
+ return 0;
+ }
+
+ /*
+ * Before memory allocations & taking nocow locks in
+ * bch2_data_update_init():
+ */
+ bch2_trans_unlock(trans);
+
+ /* write path might have to decompress data: */
+ bkey_for_each_ptr_decode(k.k, ptrs, p, entry)
+ sectors = max_t(unsigned, sectors, p.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;
+
+ INIT_LIST_HEAD(&io->io_list);
+ io->write.ctxt = ctxt;
+ io->read_sectors = k.k->size;
+ io->write_sectors = k.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.c = c;
+ 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(k.k);
+ io->rbio.bio.bi_end_io = move_read_endio;
+
+ ret = bch2_data_update_init(trans, iter, ctxt, &io->write, ctxt->wp,
+ io_opts, data_opts, iter->btree_id, k);
+ if (ret)
+ goto err_free_pages;
+
+ io->write.op.end_io = move_write_done;
+
+ if (ctxt->rate)
+ bch2_ratelimit_increment(ctxt->rate, k.k->size);
+
+ if (ctxt->stats) {
+ atomic64_inc(&ctxt->stats->keys_moved);
+ atomic64_add(k.k->size, &ctxt->stats->sectors_moved);
+ }
+
+ if (bucket_in_flight) {
+ io->b = bucket_in_flight;
+ atomic_inc(&io->b->count);
+ }
+
+ this_cpu_add(c->counters[BCH_COUNTER_io_move], k.k->size);
+ this_cpu_add(c->counters[BCH_COUNTER_move_extent_read], k.k->size);
+ trace_move_extent_read2(c, k);
+
+ mutex_lock(&ctxt->lock);
+ atomic_add(io->read_sectors, &ctxt->read_sectors);
+ atomic_inc(&ctxt->read_ios);
+
+ list_add_tail(&io->read_list, &ctxt->reads);
+ list_add_tail(&io->io_list, &ctxt->ios);
+ mutex_unlock(&ctxt->lock);
+
+ /*
+ * dropped by move_read_endio() - guards against use after free of
+ * ctxt when doing wakeup
+ */
+ closure_get(&ctxt->cl);
+ bch2_read_extent(trans, &io->rbio,
+ bkey_start_pos(k.k),
+ iter->btree_id, k, 0,
+ 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:
+ if (ret == -BCH_ERR_data_update_done)
+ return 0;
+
+ if (bch2_err_matches(ret, EROFS) ||
+ bch2_err_matches(ret, BCH_ERR_transaction_restart))
+ return ret;
+
+ this_cpu_inc(c->counters[BCH_COUNTER_move_extent_start_fail]);
+ if (trace_move_extent_start_fail_enabled()) {
+ struct printbuf buf = PRINTBUF;
+
+ bch2_bkey_val_to_text(&buf, c, k);
+ prt_str(&buf, ": ");
+ prt_str(&buf, bch2_err_str(ret));
+ trace_move_extent_start_fail(c, buf.buf);
+ printbuf_exit(&buf);
+ }
+ return ret;
+}
+
+struct bch_io_opts *bch2_move_get_io_opts(struct btree_trans *trans,
+ struct per_snapshot_io_opts *io_opts,
+ struct bkey_s_c extent_k)
+{
+ struct bch_fs *c = trans->c;
+ u32 restart_count = trans->restart_count;
+ int ret = 0;
+
+ if (io_opts->cur_inum != extent_k.k->p.inode) {
+ struct btree_iter iter;
+ struct bkey_s_c k;
+
+ io_opts->d.nr = 0;
+
+ for_each_btree_key(trans, iter, BTREE_ID_inodes, POS(0, extent_k.k->p.inode),
+ BTREE_ITER_ALL_SNAPSHOTS, k, ret) {
+ if (k.k->p.offset != extent_k.k->p.inode)
+ break;
+
+ if (!bkey_is_inode(k.k))
+ continue;
+
+ struct bch_inode_unpacked inode;
+ BUG_ON(bch2_inode_unpack(k, &inode));
+
+ struct snapshot_io_opts_entry e = { .snapshot = k.k->p.snapshot };
+ bch2_inode_opts_get(&e.io_opts, trans->c, &inode);
+
+ ret = darray_push(&io_opts->d, e);
+ if (ret)
+ break;
+ }
+ bch2_trans_iter_exit(trans, &iter);
+ io_opts->cur_inum = extent_k.k->p.inode;
+ }
+
+ ret = ret ?: trans_was_restarted(trans, restart_count);
+ if (ret)
+ return ERR_PTR(ret);
+
+ if (extent_k.k->p.snapshot) {
+ struct snapshot_io_opts_entry *i;
+ darray_for_each(io_opts->d, i)
+ if (bch2_snapshot_is_ancestor(c, extent_k.k->p.snapshot, i->snapshot))
+ return &i->io_opts;
+ }
+
+ return &io_opts->fs_io_opts;
+}
+
+int bch2_move_get_io_opts_one(struct btree_trans *trans,
+ struct bch_io_opts *io_opts,
+ struct bkey_s_c extent_k)
+{
+ struct btree_iter iter;
+ struct bkey_s_c k;
+ int ret;
+
+ /* reflink btree? */
+ if (!extent_k.k->p.inode) {
+ *io_opts = bch2_opts_to_inode_opts(trans->c->opts);
+ return 0;
+ }
+
+ k = bch2_bkey_get_iter(trans, &iter, BTREE_ID_inodes,
+ SPOS(0, extent_k.k->p.inode, extent_k.k->p.snapshot),
+ BTREE_ITER_CACHED);
+ ret = bkey_err(k);
+ if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
+ return ret;
+
+ if (!ret && bkey_is_inode(k.k)) {
+ struct bch_inode_unpacked inode;
+ bch2_inode_unpack(k, &inode);
+ bch2_inode_opts_get(io_opts, trans->c, &inode);
+ } else {
+ *io_opts = bch2_opts_to_inode_opts(trans->c->opts);
+ }
+
+ bch2_trans_iter_exit(trans, &iter);
+ return 0;
+}
+
+int bch2_move_ratelimit(struct moving_context *ctxt)
+{
+ struct bch_fs *c = ctxt->trans->c;
+ bool is_kthread = current->flags & PF_KTHREAD;
+ u64 delay;
+
+ if (ctxt->wait_on_copygc && c->copygc_running) {
+ bch2_moving_ctxt_flush_all(ctxt);
+ wait_event_killable(c->copygc_running_wq,
+ !c->copygc_running ||
+ (is_kthread && kthread_should_stop()));
+ }
+
+ do {
+ delay = ctxt->rate ? bch2_ratelimit_delay(ctxt->rate) : 0;
+
+ if (is_kthread && kthread_should_stop())
+ return 1;
+
+ if (delay)
+ move_ctxt_wait_event_timeout(ctxt,
+ freezing(current) ||
+ (is_kthread && kthread_should_stop()),
+ delay);
+
+ if (unlikely(freezing(current))) {
+ bch2_moving_ctxt_flush_all(ctxt);
+ try_to_freeze();
+ }
+ } while (delay);
+
+ /*
+ * XXX: these limits really ought to be per device, SSDs and hard drives
+ * will want different limits
+ */
+ move_ctxt_wait_event(ctxt,
+ atomic_read(&ctxt->write_sectors) < c->opts.move_bytes_in_flight >> 9 &&
+ atomic_read(&ctxt->read_sectors) < c->opts.move_bytes_in_flight >> 9 &&
+ atomic_read(&ctxt->write_ios) < c->opts.move_ios_in_flight &&
+ atomic_read(&ctxt->read_ios) < c->opts.move_ios_in_flight);
+
+ return 0;
+}
+
+static int bch2_move_data_btree(struct moving_context *ctxt,
+ struct bpos start,
+ struct bpos end,
+ move_pred_fn pred, void *arg,
+ enum btree_id btree_id)
+{
+ struct btree_trans *trans = ctxt->trans;
+ struct bch_fs *c = trans->c;
+ struct per_snapshot_io_opts snapshot_io_opts;
+ struct bch_io_opts *io_opts;
+ struct bkey_buf sk;
+ struct btree_iter iter;
+ struct bkey_s_c k;
+ struct data_update_opts data_opts;
+ int ret = 0, ret2;
+
+ per_snapshot_io_opts_init(&snapshot_io_opts, c);
+ bch2_bkey_buf_init(&sk);
+
+ if (ctxt->stats) {
+ ctxt->stats->data_type = BCH_DATA_user;
+ ctxt->stats->pos = BBPOS(btree_id, start);
+ }
+
+ bch2_trans_iter_init(trans, &iter, btree_id, start,
+ BTREE_ITER_PREFETCH|
+ BTREE_ITER_ALL_SNAPSHOTS);
+
+ if (ctxt->rate)
+ bch2_ratelimit_reset(ctxt->rate);
+
+ while (!bch2_move_ratelimit(ctxt)) {
+ bch2_trans_begin(trans);
+
+ k = bch2_btree_iter_peek(&iter);
+ if (!k.k)
+ break;
+
+ ret = bkey_err(k);
+ if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
+ continue;
+ if (ret)
+ break;
+
+ if (bkey_ge(bkey_start_pos(k.k), end))
+ break;
+
+ if (ctxt->stats)
+ ctxt->stats->pos = BBPOS(iter.btree_id, iter.pos);
+
+ if (!bkey_extent_is_direct_data(k.k))
+ goto next_nondata;
+
+ io_opts = bch2_move_get_io_opts(trans, &snapshot_io_opts, k);
+ ret = PTR_ERR_OR_ZERO(io_opts);
+ if (ret)
+ continue;
+
+ memset(&data_opts, 0, sizeof(data_opts));
+ if (!pred(c, arg, k, io_opts, &data_opts))
+ goto next;
+
+ /*
+ * The iterator gets unlocked by __bch2_read_extent - need to
+ * save a copy of @k elsewhere:
+ */
+ bch2_bkey_buf_reassemble(&sk, c, k);
+ k = bkey_i_to_s_c(sk.k);
+
+ ret2 = bch2_move_extent(ctxt, NULL, &iter, k, *io_opts, data_opts);
+ if (ret2) {
+ if (bch2_err_matches(ret2, BCH_ERR_transaction_restart))
+ continue;
+
+ 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;
+ }
+next:
+ if (ctxt->stats)
+ atomic64_add(k.k->size, &ctxt->stats->sectors_seen);
+next_nondata:
+ bch2_btree_iter_advance(&iter);
+ }
+
+ bch2_trans_iter_exit(trans, &iter);
+ bch2_bkey_buf_exit(&sk, c);
+ per_snapshot_io_opts_exit(&snapshot_io_opts);
+
+ return ret;
+}
+
+int __bch2_move_data(struct moving_context *ctxt,
+ struct bbpos start,
+ struct bbpos end,
+ move_pred_fn pred, void *arg)
+{
+ struct bch_fs *c = ctxt->trans->c;
+ enum btree_id id;
+ int ret = 0;
+
+ for (id = start.btree;
+ id <= min_t(unsigned, end.btree, btree_id_nr_alive(c) - 1);
+ id++) {
+ ctxt->stats->pos = BBPOS(id, POS_MIN);
+
+ if (!btree_type_has_ptrs(id) ||
+ !bch2_btree_id_root(c, id)->b)
+ continue;
+
+ ret = bch2_move_data_btree(ctxt,
+ id == start.btree ? start.pos : POS_MIN,
+ id == end.btree ? end.pos : POS_MAX,
+ pred, arg, id);
+ if (ret)
+ break;
+ }
+
+ return ret;
+}
+
+int bch2_move_data(struct bch_fs *c,
+ struct bbpos start,
+ struct bbpos end,
+ struct bch_ratelimit *rate,
+ struct bch_move_stats *stats,
+ struct write_point_specifier wp,
+ bool wait_on_copygc,
+ move_pred_fn pred, void *arg)
+{
+
+ struct moving_context ctxt;
+ int ret;
+
+ bch2_moving_ctxt_init(&ctxt, c, rate, stats, wp, wait_on_copygc);
+ ret = __bch2_move_data(&ctxt, start, end, pred, arg);
+ bch2_moving_ctxt_exit(&ctxt);
+
+ return ret;
+}
+
+int __bch2_evacuate_bucket(struct moving_context *ctxt,
+ struct move_bucket_in_flight *bucket_in_flight,
+ struct bpos bucket, int gen,
+ struct data_update_opts _data_opts)
+{
+ struct btree_trans *trans = ctxt->trans;
+ struct bch_fs *c = trans->c;
+ bool is_kthread = current->flags & PF_KTHREAD;
+ struct bch_io_opts io_opts = bch2_opts_to_inode_opts(c->opts);
+ struct btree_iter iter;
+ struct bkey_buf sk;
+ struct bch_backpointer bp;
+ struct bch_alloc_v4 a_convert;
+ const struct bch_alloc_v4 *a;
+ struct bkey_s_c k;
+ struct data_update_opts data_opts;
+ unsigned dirty_sectors, bucket_size;
+ u64 fragmentation;
+ struct bpos bp_pos = POS_MIN;
+ int ret = 0;
+
+ trace_bucket_evacuate(c, &bucket);
+
+ bch2_bkey_buf_init(&sk);
+
+ /*
+ * We're not run in a context that handles transaction restarts:
+ */
+ bch2_trans_begin(trans);
+
+ bch2_trans_iter_init(trans, &iter, BTREE_ID_alloc,
+ bucket, BTREE_ITER_CACHED);
+ ret = lockrestart_do(trans,
+ bkey_err(k = bch2_btree_iter_peek_slot(&iter)));
+ bch2_trans_iter_exit(trans, &iter);
+
+ if (ret) {
+ bch_err_msg(c, ret, "looking up alloc key");
+ goto err;
+ }
+
+ a = bch2_alloc_to_v4(k, &a_convert);
+ dirty_sectors = a->dirty_sectors;
+ bucket_size = bch_dev_bkey_exists(c, bucket.inode)->mi.bucket_size;
+ fragmentation = a->fragmentation_lru;
+
+ ret = bch2_btree_write_buffer_flush(trans);
+ if (ret) {
+ bch_err_msg(c, ret, "flushing btree write buffer");
+ goto err;
+ }
+
+ while (!(ret = bch2_move_ratelimit(ctxt))) {
+ if (is_kthread && kthread_should_stop())
+ break;
+
+ bch2_trans_begin(trans);
+
+ ret = bch2_get_next_backpointer(trans, bucket, gen,
+ &bp_pos, &bp,
+ BTREE_ITER_CACHED);
+ if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
+ continue;
+ if (ret)
+ goto err;
+ if (bkey_eq(bp_pos, POS_MAX))
+ break;
+
+ if (!bp.level) {
+ const struct bch_extent_ptr *ptr;
+ unsigned i = 0;
+
+ k = bch2_backpointer_get_key(trans, &iter, bp_pos, bp, 0);
+ ret = bkey_err(k);
+ if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
+ continue;
+ if (ret)
+ goto err;
+ if (!k.k)
+ goto next;
+
+ bch2_bkey_buf_reassemble(&sk, c, k);
+ k = bkey_i_to_s_c(sk.k);
+
+ ret = bch2_move_get_io_opts_one(trans, &io_opts, k);
+ if (ret) {
+ bch2_trans_iter_exit(trans, &iter);
+ continue;
+ }
+
+ data_opts = _data_opts;
+ data_opts.target = io_opts.background_target;
+ data_opts.rewrite_ptrs = 0;
+
+ bkey_for_each_ptr(bch2_bkey_ptrs_c(k), ptr) {
+ if (ptr->dev == bucket.inode) {
+ data_opts.rewrite_ptrs |= 1U << i;
+ if (ptr->cached) {
+ bch2_trans_iter_exit(trans, &iter);
+ goto next;
+ }
+ }
+ i++;
+ }
+
+ ret = bch2_move_extent(ctxt, bucket_in_flight,
+ &iter, k, io_opts, data_opts);
+ bch2_trans_iter_exit(trans, &iter);
+
+ if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
+ continue;
+ if (ret == -ENOMEM) {
+ /* memory allocation failure, wait for some IO to finish */
+ bch2_move_ctxt_wait_for_io(ctxt);
+ continue;
+ }
+ if (ret)
+ goto err;
+
+ if (ctxt->stats)
+ atomic64_add(k.k->size, &ctxt->stats->sectors_seen);
+ } else {
+ struct btree *b;
+
+ b = bch2_backpointer_get_node(trans, &iter, bp_pos, bp);
+ ret = PTR_ERR_OR_ZERO(b);
+ if (ret == -BCH_ERR_backpointer_to_overwritten_btree_node)
+ continue;
+ if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
+ continue;
+ if (ret)
+ goto err;
+ if (!b)
+ goto next;
+
+ ret = bch2_btree_node_rewrite(trans, &iter, b, 0);
+ bch2_trans_iter_exit(trans, &iter);
+
+ if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
+ continue;
+ if (ret)
+ goto err;
+
+ if (ctxt->rate)
+ bch2_ratelimit_increment(ctxt->rate,
+ c->opts.btree_node_size >> 9);
+ if (ctxt->stats) {
+ atomic64_add(c->opts.btree_node_size >> 9, &ctxt->stats->sectors_seen);
+ atomic64_add(c->opts.btree_node_size >> 9, &ctxt->stats->sectors_moved);
+ }
+ }
+next:
+ bp_pos = bpos_nosnap_successor(bp_pos);
+ }
+
+ trace_evacuate_bucket(c, &bucket, dirty_sectors, bucket_size, fragmentation, ret);
+err:
+ bch2_bkey_buf_exit(&sk, c);
+ return ret;
+}
+
+int bch2_evacuate_bucket(struct bch_fs *c,
+ struct bpos bucket, int gen,
+ struct data_update_opts data_opts,
+ struct bch_ratelimit *rate,
+ struct bch_move_stats *stats,
+ struct write_point_specifier wp,
+ bool wait_on_copygc)
+{
+ struct moving_context ctxt;
+ int ret;
+
+ bch2_moving_ctxt_init(&ctxt, c, rate, stats, wp, wait_on_copygc);
+ ret = __bch2_evacuate_bucket(&ctxt, NULL, bucket, gen, data_opts);
+ bch2_moving_ctxt_exit(&ctxt);
+
+ return ret;
+}
+
+typedef bool (*move_btree_pred)(struct bch_fs *, void *,
+ struct btree *, struct bch_io_opts *,
+ struct data_update_opts *);
+
+static int bch2_move_btree(struct bch_fs *c,
+ enum btree_id start_btree_id, struct bpos start_pos,
+ enum btree_id end_btree_id, struct bpos end_pos,
+ move_btree_pred pred, void *arg,
+ struct bch_move_stats *stats)
+{
+ bool kthread = (current->flags & PF_KTHREAD) != 0;
+ struct bch_io_opts io_opts = bch2_opts_to_inode_opts(c->opts);
+ struct moving_context ctxt;
+ struct btree_trans *trans;
+ struct btree_iter iter;
+ struct btree *b;
+ enum btree_id id;
+ struct data_update_opts data_opts;
+ int ret = 0;
+
+ bch2_moving_ctxt_init(&ctxt, c, NULL, stats,
+ writepoint_ptr(&c->btree_write_point),
+ true);
+ trans = ctxt.trans;
+
+ stats->data_type = BCH_DATA_btree;
+
+ for (id = start_btree_id;
+ id <= min_t(unsigned, end_btree_id, btree_id_nr_alive(c) - 1);
+ id++) {
+ stats->pos = BBPOS(id, POS_MIN);
+
+ if (!bch2_btree_id_root(c, id)->b)
+ continue;
+
+ 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 (kthread && kthread_should_stop())
+ break;
+
+ if ((cmp_int(id, end_btree_id) ?:
+ bpos_cmp(b->key.k.p, end_pos)) > 0)
+ break;
+
+ stats->pos = BBPOS(iter.btree_id, iter.pos);
+
+ if (!pred(c, arg, b, &io_opts, &data_opts))
+ goto next;
+
+ ret = bch2_btree_node_rewrite(trans, &iter, b, 0) ?: ret;
+ if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
+ continue;
+ if (ret)
+ 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 (kthread && kthread_should_stop())
+ break;
+ }
+
+ bch_err_fn(c, ret);
+ bch2_moving_ctxt_exit(&ctxt);
+ bch2_btree_interior_updates_flush(c);
+
+ return ret;
+}
+
+static bool rereplicate_pred(struct bch_fs *c, void *arg,
+ struct bkey_s_c k,
+ struct bch_io_opts *io_opts,
+ struct data_update_opts *data_opts)
+{
+ unsigned nr_good = bch2_bkey_durability(c, k);
+ unsigned replicas = bkey_is_btree_ptr(k.k)
+ ? c->opts.metadata_replicas
+ : io_opts->data_replicas;
+
+ if (!nr_good || nr_good >= replicas)
+ return false;
+
+ data_opts->target = 0;
+ data_opts->extra_replicas = replicas - nr_good;
+ data_opts->btree_insert_flags = 0;
+ return true;
+}
+
+static bool migrate_pred(struct bch_fs *c, void *arg,
+ struct bkey_s_c k,
+ struct bch_io_opts *io_opts,
+ struct data_update_opts *data_opts)
+{
+ struct bkey_ptrs_c ptrs = bch2_bkey_ptrs_c(k);
+ const struct bch_extent_ptr *ptr;
+ struct bch_ioctl_data *op = arg;
+ unsigned i = 0;
+
+ data_opts->rewrite_ptrs = 0;
+ data_opts->target = 0;
+ data_opts->extra_replicas = 0;
+ data_opts->btree_insert_flags = 0;
+
+ bkey_for_each_ptr(ptrs, ptr) {
+ if (ptr->dev == op->migrate.dev)
+ data_opts->rewrite_ptrs |= 1U << i;
+ i++;
+ }
+
+ return data_opts->rewrite_ptrs != 0;
+}
+
+static bool rereplicate_btree_pred(struct bch_fs *c, void *arg,
+ struct btree *b,
+ struct bch_io_opts *io_opts,
+ struct data_update_opts *data_opts)
+{
+ return rereplicate_pred(c, arg, bkey_i_to_s_c(&b->key), io_opts, data_opts);
+}
+
+static bool migrate_btree_pred(struct bch_fs *c, void *arg,
+ struct btree *b,
+ struct bch_io_opts *io_opts,
+ struct data_update_opts *data_opts)
+{
+ return migrate_pred(c, arg, bkey_i_to_s_c(&b->key), io_opts, data_opts);
+}
+
+static bool bformat_needs_redo(struct bkey_format *f)
+{
+ unsigned i;
+
+ for (i = 0; i < f->nr_fields; i++) {
+ unsigned unpacked_bits = bch2_bkey_format_current.bits_per_field[i];
+ u64 unpacked_mask = ~((~0ULL << 1) << (unpacked_bits - 1));
+ u64 field_offset = le64_to_cpu(f->field_offset[i]);
+
+ if (f->bits_per_field[i] > unpacked_bits)
+ return true;
+
+ if ((f->bits_per_field[i] == unpacked_bits) && field_offset)
+ return true;
+
+ if (((field_offset + ((1ULL << f->bits_per_field[i]) - 1)) &
+ unpacked_mask) <
+ field_offset)
+ return true;
+ }
+
+ return false;
+}
+
+static bool rewrite_old_nodes_pred(struct bch_fs *c, void *arg,
+ struct btree *b,
+ struct bch_io_opts *io_opts,
+ struct data_update_opts *data_opts)
+{
+ if (b->version_ondisk != c->sb.version ||
+ btree_node_need_rewrite(b) ||
+ bformat_needs_redo(&b->format)) {
+ data_opts->target = 0;
+ data_opts->extra_replicas = 0;
+ data_opts->btree_insert_flags = 0;
+ return true;
+ }
+
+ return false;
+}
+
+int bch2_scan_old_btree_nodes(struct bch_fs *c, struct bch_move_stats *stats)
+{
+ int ret;
+
+ ret = bch2_move_btree(c,
+ 0, POS_MIN,
+ BTREE_ID_NR, SPOS_MAX,
+ rewrite_old_nodes_pred, c, stats);
+ if (!ret) {
+ mutex_lock(&c->sb_lock);
+ c->disk_sb.sb->compat[0] |= cpu_to_le64(1ULL << BCH_COMPAT_extents_above_btree_updates_done);
+ c->disk_sb.sb->compat[0] |= cpu_to_le64(1ULL << BCH_COMPAT_bformat_overflow_done);
+ c->disk_sb.sb->version_min = c->disk_sb.sb->version;
+ bch2_write_super(c);
+ mutex_unlock(&c->sb_lock);
+ }
+
+ bch_err_fn(c, ret);
+ return ret;
+}
+
+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:
+ bch2_move_stats_init(stats, "rereplicate");
+ stats->data_type = BCH_DATA_journal;
+ ret = bch2_journal_flush_device_pins(&c->journal, -1);
+
+ ret = bch2_move_btree(c,
+ op.start_btree, op.start_pos,
+ op.end_btree, op.end_pos,
+ rereplicate_btree_pred, c, stats) ?: ret;
+ ret = bch2_replicas_gc2(c) ?: ret;
+
+ ret = bch2_move_data(c,
+ (struct bbpos) { op.start_btree, op.start_pos },
+ (struct bbpos) { op.end_btree, op.end_pos },
+ NULL,
+ stats,
+ writepoint_hashed((unsigned long) current),
+ true,
+ rereplicate_pred, c) ?: ret;
+ ret = bch2_replicas_gc2(c) ?: ret;
+
+ bch2_move_stats_exit(stats, c);
+ break;
+ case BCH_DATA_OP_MIGRATE:
+ if (op.migrate.dev >= c->sb.nr_devices)
+ return -EINVAL;
+
+ bch2_move_stats_init(stats, "migrate");
+ stats->data_type = BCH_DATA_journal;
+ ret = bch2_journal_flush_device_pins(&c->journal, op.migrate.dev);
+
+ ret = bch2_move_btree(c,
+ op.start_btree, op.start_pos,
+ op.end_btree, op.end_pos,
+ migrate_btree_pred, &op, stats) ?: ret;
+ ret = bch2_replicas_gc2(c) ?: ret;
+
+ ret = bch2_move_data(c,
+ (struct bbpos) { op.start_btree, op.start_pos },
+ (struct bbpos) { op.end_btree, op.end_pos },
+ NULL,
+ stats,
+ writepoint_hashed((unsigned long) current),
+ true,
+ migrate_pred, &op) ?: ret;
+ ret = bch2_replicas_gc2(c) ?: ret;
+
+ bch2_move_stats_exit(stats, c);
+ break;
+ case BCH_DATA_OP_REWRITE_OLD_NODES:
+ bch2_move_stats_init(stats, "rewrite_old_nodes");
+ ret = bch2_scan_old_btree_nodes(c, stats);
+ bch2_move_stats_exit(stats, c);
+ break;
+ default:
+ ret = -EINVAL;
+ }
+
+ return ret;
+}
+
+void bch2_move_stats_to_text(struct printbuf *out, struct bch_move_stats *stats)
+{
+ prt_printf(out, "%s: data type=%s pos=",
+ stats->name,
+ bch2_data_types[stats->data_type]);
+ bch2_bbpos_to_text(out, stats->pos);
+ prt_newline(out);
+ printbuf_indent_add(out, 2);
+
+ prt_str(out, "keys moved: ");
+ prt_u64(out, atomic64_read(&stats->keys_moved));
+ prt_newline(out);
+
+ prt_str(out, "keys raced: ");
+ prt_u64(out, atomic64_read(&stats->keys_raced));
+ prt_newline(out);
+
+ prt_str(out, "bytes seen: ");
+ prt_human_readable_u64(out, atomic64_read(&stats->sectors_seen) << 9);
+ prt_newline(out);
+
+ prt_str(out, "bytes moved: ");
+ prt_human_readable_u64(out, atomic64_read(&stats->sectors_moved) << 9);
+ prt_newline(out);
+
+ prt_str(out, "bytes raced: ");
+ prt_human_readable_u64(out, atomic64_read(&stats->sectors_raced) << 9);
+ prt_newline(out);
+
+ printbuf_indent_sub(out, 2);
+}
+
+static void bch2_moving_ctxt_to_text(struct printbuf *out, struct bch_fs *c, struct moving_context *ctxt)
+{
+ struct moving_io *io;
+
+ bch2_move_stats_to_text(out, ctxt->stats);
+ printbuf_indent_add(out, 2);
+
+ prt_printf(out, "reads: ios %u/%u sectors %u/%u",
+ atomic_read(&ctxt->read_ios),
+ c->opts.move_ios_in_flight,
+ atomic_read(&ctxt->read_sectors),
+ c->opts.move_bytes_in_flight >> 9);
+ prt_newline(out);
+
+ prt_printf(out, "writes: ios %u/%u sectors %u/%u",
+ atomic_read(&ctxt->write_ios),
+ c->opts.move_ios_in_flight,
+ atomic_read(&ctxt->write_sectors),
+ c->opts.move_bytes_in_flight >> 9);
+ prt_newline(out);
+
+ printbuf_indent_add(out, 2);
+
+ mutex_lock(&ctxt->lock);
+ list_for_each_entry(io, &ctxt->ios, io_list)
+ bch2_write_op_to_text(out, &io->write.op);
+ mutex_unlock(&ctxt->lock);
+
+ printbuf_indent_sub(out, 4);
+}
+
+void bch2_fs_moving_ctxts_to_text(struct printbuf *out, struct bch_fs *c)
+{
+ struct moving_context *ctxt;
+
+ mutex_lock(&c->moving_context_lock);
+ list_for_each_entry(ctxt, &c->moving_context_list, list)
+ bch2_moving_ctxt_to_text(out, c, ctxt);
+ mutex_unlock(&c->moving_context_lock);
+}
+
+void bch2_fs_move_init(struct bch_fs *c)
+{
+ INIT_LIST_HEAD(&c->moving_context_list);
+ mutex_init(&c->moving_context_lock);
+}