diff options
Diffstat (limited to 'c_src/libbcachefs/rebalance.c')
-rw-r--r-- | c_src/libbcachefs/rebalance.c | 486 |
1 files changed, 0 insertions, 486 deletions
diff --git a/c_src/libbcachefs/rebalance.c b/c_src/libbcachefs/rebalance.c deleted file mode 100644 index 95f46cb3..00000000 --- a/c_src/libbcachefs/rebalance.c +++ /dev/null @@ -1,486 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 - -#include "bcachefs.h" -#include "alloc_background.h" -#include "alloc_foreground.h" -#include "btree_iter.h" -#include "btree_update.h" -#include "btree_write_buffer.h" -#include "buckets.h" -#include "clock.h" -#include "compress.h" -#include "disk_groups.h" -#include "errcode.h" -#include "error.h" -#include "inode.h" -#include "move.h" -#include "rebalance.h" -#include "subvolume.h" -#include "super-io.h" -#include "trace.h" - -#include <linux/freezer.h> -#include <linux/kthread.h> -#include <linux/sched/cputime.h> - -#define REBALANCE_WORK_SCAN_OFFSET (U64_MAX - 1) - -static const char * const bch2_rebalance_state_strs[] = { -#define x(t) #t, - BCH_REBALANCE_STATES() - NULL -#undef x -}; - -static int __bch2_set_rebalance_needs_scan(struct btree_trans *trans, u64 inum) -{ - struct btree_iter iter; - struct bkey_s_c k; - struct bkey_i_cookie *cookie; - u64 v; - int ret; - - bch2_trans_iter_init(trans, &iter, BTREE_ID_rebalance_work, - SPOS(inum, REBALANCE_WORK_SCAN_OFFSET, U32_MAX), - BTREE_ITER_INTENT); - k = bch2_btree_iter_peek_slot(&iter); - ret = bkey_err(k); - if (ret) - goto err; - - v = k.k->type == KEY_TYPE_cookie - ? le64_to_cpu(bkey_s_c_to_cookie(k).v->cookie) - : 0; - - cookie = bch2_trans_kmalloc(trans, sizeof(*cookie)); - ret = PTR_ERR_OR_ZERO(cookie); - if (ret) - goto err; - - bkey_cookie_init(&cookie->k_i); - cookie->k.p = iter.pos; - cookie->v.cookie = cpu_to_le64(v + 1); - - ret = bch2_trans_update(trans, &iter, &cookie->k_i, 0); -err: - bch2_trans_iter_exit(trans, &iter); - return ret; -} - -int bch2_set_rebalance_needs_scan(struct bch_fs *c, u64 inum) -{ - int ret = bch2_trans_do(c, NULL, NULL, BCH_TRANS_COMMIT_no_enospc|BCH_TRANS_COMMIT_lazy_rw, - __bch2_set_rebalance_needs_scan(trans, inum)); - rebalance_wakeup(c); - return ret; -} - -int bch2_set_fs_needs_rebalance(struct bch_fs *c) -{ - return bch2_set_rebalance_needs_scan(c, 0); -} - -static int bch2_clear_rebalance_needs_scan(struct btree_trans *trans, u64 inum, u64 cookie) -{ - struct btree_iter iter; - struct bkey_s_c k; - u64 v; - int ret; - - bch2_trans_iter_init(trans, &iter, BTREE_ID_rebalance_work, - SPOS(inum, REBALANCE_WORK_SCAN_OFFSET, U32_MAX), - BTREE_ITER_INTENT); - k = bch2_btree_iter_peek_slot(&iter); - ret = bkey_err(k); - if (ret) - goto err; - - v = k.k->type == KEY_TYPE_cookie - ? le64_to_cpu(bkey_s_c_to_cookie(k).v->cookie) - : 0; - - if (v == cookie) - ret = bch2_btree_delete_at(trans, &iter, 0); -err: - bch2_trans_iter_exit(trans, &iter); - return ret; -} - -static struct bkey_s_c next_rebalance_entry(struct btree_trans *trans, - struct btree_iter *work_iter) -{ - return !kthread_should_stop() - ? bch2_btree_iter_peek(work_iter) - : bkey_s_c_null; -} - -static int bch2_bkey_clear_needs_rebalance(struct btree_trans *trans, - struct btree_iter *iter, - struct bkey_s_c k) -{ - struct bkey_i *n = bch2_bkey_make_mut(trans, iter, &k, 0); - int ret = PTR_ERR_OR_ZERO(n); - if (ret) - return ret; - - extent_entry_drop(bkey_i_to_s(n), - (void *) bch2_bkey_rebalance_opts(bkey_i_to_s_c(n))); - return bch2_trans_commit(trans, NULL, NULL, BCH_TRANS_COMMIT_no_enospc); -} - -static struct bkey_s_c next_rebalance_extent(struct btree_trans *trans, - struct bpos work_pos, - struct btree_iter *extent_iter, - struct data_update_opts *data_opts) -{ - struct bch_fs *c = trans->c; - struct bkey_s_c k; - - bch2_trans_iter_exit(trans, extent_iter); - bch2_trans_iter_init(trans, extent_iter, - work_pos.inode ? BTREE_ID_extents : BTREE_ID_reflink, - work_pos, - BTREE_ITER_ALL_SNAPSHOTS); - k = bch2_btree_iter_peek_slot(extent_iter); - if (bkey_err(k)) - return k; - - const struct bch_extent_rebalance *r = k.k ? bch2_bkey_rebalance_opts(k) : NULL; - if (!r) { - /* raced due to btree write buffer, nothing to do */ - return bkey_s_c_null; - } - - memset(data_opts, 0, sizeof(*data_opts)); - - data_opts->rewrite_ptrs = - bch2_bkey_ptrs_need_rebalance(c, k, r->target, r->compression); - data_opts->target = r->target; - - if (!data_opts->rewrite_ptrs) { - /* - * device we would want to write to offline? devices in target - * changed? - * - * We'll now need a full scan before this extent is picked up - * again: - */ - int ret = bch2_bkey_clear_needs_rebalance(trans, extent_iter, k); - if (ret) - return bkey_s_c_err(ret); - return bkey_s_c_null; - } - - if (trace_rebalance_extent_enabled()) { - struct printbuf buf = PRINTBUF; - - prt_str(&buf, "target="); - bch2_target_to_text(&buf, c, r->target); - prt_str(&buf, " compression="); - struct bch_compression_opt opt = __bch2_compression_decode(r->compression); - prt_str(&buf, bch2_compression_opts[opt.type]); - prt_str(&buf, " "); - bch2_bkey_val_to_text(&buf, c, k); - - trace_rebalance_extent(c, buf.buf); - printbuf_exit(&buf); - } - - return k; -} - -noinline_for_stack -static int do_rebalance_extent(struct moving_context *ctxt, - struct bpos work_pos, - struct btree_iter *extent_iter) -{ - struct btree_trans *trans = ctxt->trans; - struct bch_fs *c = trans->c; - struct bch_fs_rebalance *r = &trans->c->rebalance; - struct data_update_opts data_opts; - struct bch_io_opts io_opts; - struct bkey_s_c k; - struct bkey_buf sk; - int ret; - - ctxt->stats = &r->work_stats; - r->state = BCH_REBALANCE_working; - - bch2_bkey_buf_init(&sk); - - ret = bkey_err(k = next_rebalance_extent(trans, work_pos, - extent_iter, &data_opts)); - if (ret || !k.k) - goto out; - - ret = bch2_move_get_io_opts_one(trans, &io_opts, k); - if (ret) - goto out; - - atomic64_add(k.k->size, &ctxt->stats->sectors_seen); - - /* - * 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); - - ret = bch2_move_extent(ctxt, NULL, extent_iter, k, io_opts, data_opts); - if (ret) { - if (bch2_err_matches(ret, ENOMEM)) { - /* memory allocation failure, wait for some IO to finish */ - bch2_move_ctxt_wait_for_io(ctxt); - ret = -BCH_ERR_transaction_restart_nested; - } - - if (bch2_err_matches(ret, BCH_ERR_transaction_restart)) - goto out; - - /* skip it and continue, XXX signal failure */ - ret = 0; - } -out: - bch2_bkey_buf_exit(&sk, c); - return ret; -} - -static bool rebalance_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 target, compression; - - if (k.k->p.inode) { - target = io_opts->background_target; - compression = io_opts->background_compression ?: io_opts->compression; - } else { - const struct bch_extent_rebalance *r = bch2_bkey_rebalance_opts(k); - - target = r ? r->target : io_opts->background_target; - compression = r ? r->compression : - (io_opts->background_compression ?: io_opts->compression); - } - - data_opts->rewrite_ptrs = bch2_bkey_ptrs_need_rebalance(c, k, target, compression); - data_opts->target = target; - return data_opts->rewrite_ptrs != 0; -} - -static int do_rebalance_scan(struct moving_context *ctxt, u64 inum, u64 cookie) -{ - struct btree_trans *trans = ctxt->trans; - struct bch_fs_rebalance *r = &trans->c->rebalance; - int ret; - - bch2_move_stats_init(&r->scan_stats, "rebalance_scan"); - ctxt->stats = &r->scan_stats; - - if (!inum) { - r->scan_start = BBPOS_MIN; - r->scan_end = BBPOS_MAX; - } else { - r->scan_start = BBPOS(BTREE_ID_extents, POS(inum, 0)); - r->scan_end = BBPOS(BTREE_ID_extents, POS(inum, U64_MAX)); - } - - r->state = BCH_REBALANCE_scanning; - - ret = __bch2_move_data(ctxt, r->scan_start, r->scan_end, rebalance_pred, NULL) ?: - commit_do(trans, NULL, NULL, BCH_TRANS_COMMIT_no_enospc, - bch2_clear_rebalance_needs_scan(trans, inum, cookie)); - - bch2_move_stats_exit(&r->scan_stats, trans->c); - return ret; -} - -static void rebalance_wait(struct bch_fs *c) -{ - struct bch_fs_rebalance *r = &c->rebalance; - struct io_clock *clock = &c->io_clock[WRITE]; - u64 now = atomic64_read(&clock->now); - u64 min_member_capacity = bch2_min_rw_member_capacity(c); - - if (min_member_capacity == U64_MAX) - min_member_capacity = 128 * 2048; - - r->wait_iotime_end = now + (min_member_capacity >> 6); - - if (r->state != BCH_REBALANCE_waiting) { - r->wait_iotime_start = now; - r->wait_wallclock_start = ktime_get_real_ns(); - r->state = BCH_REBALANCE_waiting; - } - - bch2_kthread_io_clock_wait(clock, r->wait_iotime_end, MAX_SCHEDULE_TIMEOUT); -} - -static int do_rebalance(struct moving_context *ctxt) -{ - struct btree_trans *trans = ctxt->trans; - struct bch_fs *c = trans->c; - struct bch_fs_rebalance *r = &c->rebalance; - struct btree_iter rebalance_work_iter, extent_iter = { NULL }; - struct bkey_s_c k; - int ret = 0; - - bch2_move_stats_init(&r->work_stats, "rebalance_work"); - bch2_move_stats_init(&r->scan_stats, "rebalance_scan"); - - bch2_trans_iter_init(trans, &rebalance_work_iter, - BTREE_ID_rebalance_work, POS_MIN, - BTREE_ITER_ALL_SNAPSHOTS); - - while (!bch2_move_ratelimit(ctxt)) { - if (!r->enabled) { - bch2_moving_ctxt_flush_all(ctxt); - kthread_wait_freezable(r->enabled || - kthread_should_stop()); - } - - if (kthread_should_stop()) - break; - - bch2_trans_begin(trans); - - ret = bkey_err(k = next_rebalance_entry(trans, &rebalance_work_iter)); - if (bch2_err_matches(ret, BCH_ERR_transaction_restart)) - continue; - if (ret || !k.k) - break; - - ret = k.k->type == KEY_TYPE_cookie - ? do_rebalance_scan(ctxt, k.k->p.inode, - le64_to_cpu(bkey_s_c_to_cookie(k).v->cookie)) - : do_rebalance_extent(ctxt, k.k->p, &extent_iter); - - if (bch2_err_matches(ret, BCH_ERR_transaction_restart)) - continue; - if (ret) - break; - - bch2_btree_iter_advance(&rebalance_work_iter); - } - - bch2_trans_iter_exit(trans, &extent_iter); - bch2_trans_iter_exit(trans, &rebalance_work_iter); - bch2_move_stats_exit(&r->scan_stats, c); - - if (!ret && - !kthread_should_stop() && - !atomic64_read(&r->work_stats.sectors_seen) && - !atomic64_read(&r->scan_stats.sectors_seen)) { - bch2_trans_unlock_long(trans); - rebalance_wait(c); - } - - if (!bch2_err_matches(ret, EROFS)) - bch_err_fn(c, ret); - return ret; -} - -static int bch2_rebalance_thread(void *arg) -{ - struct bch_fs *c = arg; - struct bch_fs_rebalance *r = &c->rebalance; - struct moving_context ctxt; - int ret; - - set_freezable(); - - bch2_moving_ctxt_init(&ctxt, c, NULL, &r->work_stats, - writepoint_ptr(&c->rebalance_write_point), - true); - - while (!kthread_should_stop() && - !(ret = do_rebalance(&ctxt))) - ; - - bch2_moving_ctxt_exit(&ctxt); - - return 0; -} - -void bch2_rebalance_status_to_text(struct printbuf *out, struct bch_fs *c) -{ - struct bch_fs_rebalance *r = &c->rebalance; - - prt_str(out, bch2_rebalance_state_strs[r->state]); - prt_newline(out); - printbuf_indent_add(out, 2); - - switch (r->state) { - case BCH_REBALANCE_waiting: { - u64 now = atomic64_read(&c->io_clock[WRITE].now); - - prt_str(out, "io wait duration: "); - bch2_prt_human_readable_s64(out, r->wait_iotime_end - r->wait_iotime_start); - prt_newline(out); - - prt_str(out, "io wait remaining: "); - bch2_prt_human_readable_s64(out, r->wait_iotime_end - now); - prt_newline(out); - - prt_str(out, "duration waited: "); - bch2_pr_time_units(out, ktime_get_real_ns() - r->wait_wallclock_start); - prt_newline(out); - break; - } - case BCH_REBALANCE_working: - bch2_move_stats_to_text(out, &r->work_stats); - break; - case BCH_REBALANCE_scanning: - bch2_move_stats_to_text(out, &r->scan_stats); - break; - } - prt_newline(out); - printbuf_indent_sub(out, 2); -} - -void bch2_rebalance_stop(struct bch_fs *c) -{ - struct task_struct *p; - - c->rebalance.pd.rate.rate = UINT_MAX; - bch2_ratelimit_reset(&c->rebalance.pd.rate); - - p = rcu_dereference_protected(c->rebalance.thread, 1); - c->rebalance.thread = NULL; - - if (p) { - /* for sychronizing with rebalance_wakeup() */ - synchronize_rcu(); - - kthread_stop(p); - put_task_struct(p); - } -} - -int bch2_rebalance_start(struct bch_fs *c) -{ - struct task_struct *p; - int ret; - - if (c->rebalance.thread) - return 0; - - if (c->opts.nochanges) - return 0; - - p = kthread_create(bch2_rebalance_thread, c, "bch-rebalance/%s", c->name); - ret = PTR_ERR_OR_ZERO(p); - bch_err_msg(c, ret, "creating rebalance thread"); - if (ret) - return ret; - - get_task_struct(p); - rcu_assign_pointer(c->rebalance.thread, p); - wake_up_process(p); - return 0; -} - -void bch2_fs_rebalance_init(struct bch_fs *c) -{ - bch2_pd_controller_init(&c->rebalance.pd); -} |