lightnvm: pblk: remove target using async. I/Os
When removing a pblk instance, pad the current line using asynchronous I/O. This reduces the removal time from ~1 minute in the worst case to a couple of seconds. Signed-off-by: Javier González <javier@cnexlabs.com> Signed-off-by: Matias Bjørling <matias@cnexlabs.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Javier González
Jens Axboe
Родитель
de54e703a4
Коммит
ee8d5c1ad5
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@ -273,9 +273,10 @@ static void pblk_flush_writer(struct pblk *pblk)
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{
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pblk_rb_flush(&pblk->rwb);
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do {
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if (!pblk_rb_read_count(&pblk->rwb))
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if (!pblk_rb_sync_count(&pblk->rwb))
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break;
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pblk_write_kick(pblk);
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schedule();
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} while (1);
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}
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@ -1350,6 +1351,7 @@ void pblk_pipeline_stop(struct pblk *pblk)
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return;
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}
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flush_workqueue(pblk->bb_wq);
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pblk_line_close_meta_sync(pblk);
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spin_lock(&l_mg->free_lock);
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@ -1547,6 +1549,7 @@ void pblk_line_close_meta_sync(struct pblk *pblk)
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}
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pblk_wait_for_meta(pblk);
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flush_workqueue(pblk->close_wq);
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}
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static void pblk_line_should_sync_meta(struct pblk *pblk)
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@ -841,6 +841,15 @@ static int pblk_writer_init(struct pblk *pblk)
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static void pblk_writer_stop(struct pblk *pblk)
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{
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/* The pipeline must be stopped and the write buffer emptied before the
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* write thread is stopped
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*/
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WARN(pblk_rb_read_count(&pblk->rwb),
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"Stopping not fully persisted write buffer\n");
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WARN(pblk_rb_sync_count(&pblk->rwb),
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"Stopping not fully synced write buffer\n");
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if (pblk->writer_ts)
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kthread_stop(pblk->writer_ts);
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del_timer(&pblk->wtimer);
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@ -180,6 +180,14 @@ unsigned int pblk_rb_read_count(struct pblk_rb *rb)
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return pblk_rb_ring_count(mem, subm, rb->nr_entries);
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}
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unsigned int pblk_rb_sync_count(struct pblk_rb *rb)
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{
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unsigned int mem = READ_ONCE(rb->mem);
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unsigned int sync = READ_ONCE(rb->sync);
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return pblk_rb_ring_count(mem, sync, rb->nr_entries);
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}
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unsigned int pblk_rb_read_commit(struct pblk_rb *rb, unsigned int nr_entries)
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{
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unsigned int subm;
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@ -327,47 +327,94 @@ next_read_rq:
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return 0;
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}
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static void pblk_recov_complete(struct kref *ref)
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{
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struct pblk_pad_rq *pad_rq = container_of(ref, struct pblk_pad_rq, ref);
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complete(&pad_rq->wait);
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}
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static void pblk_end_io_recov(struct nvm_rq *rqd)
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{
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struct pblk_pad_rq *pad_rq = rqd->private;
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struct pblk *pblk = pad_rq->pblk;
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struct nvm_tgt_dev *dev = pblk->dev;
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kref_put(&pad_rq->ref, pblk_recov_complete);
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nvm_dev_dma_free(dev->parent, rqd->meta_list, rqd->dma_meta_list);
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pblk_free_rqd(pblk, rqd, WRITE);
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}
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static int pblk_recov_pad_oob(struct pblk *pblk, struct pblk_line *line,
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struct pblk_recov_alloc p, int left_ppas)
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int left_ppas)
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{
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struct nvm_tgt_dev *dev = pblk->dev;
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struct nvm_geo *geo = &dev->geo;
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struct ppa_addr *ppa_list;
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struct pblk_sec_meta *meta_list;
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struct pblk_pad_rq *pad_rq;
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struct nvm_rq *rqd;
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struct bio *bio;
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void *data;
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dma_addr_t dma_ppa_list, dma_meta_list;
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__le64 *lba_list = emeta_to_lbas(pblk, line->emeta->buf);
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u64 w_ptr = line->cur_sec;
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int left_line_ppas = line->left_msecs;
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int rq_ppas, rq_len;
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int left_line_ppas, rq_ppas, rq_len;
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int i, j;
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int ret = 0;
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DECLARE_COMPLETION_ONSTACK(wait);
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ppa_list = p.ppa_list;
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meta_list = p.meta_list;
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rqd = p.rqd;
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data = p.data;
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dma_ppa_list = p.dma_ppa_list;
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dma_meta_list = p.dma_meta_list;
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spin_lock(&line->lock);
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left_line_ppas = line->left_msecs;
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spin_unlock(&line->lock);
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pad_rq = kmalloc(sizeof(struct pblk_pad_rq), GFP_KERNEL);
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if (!pad_rq)
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return -ENOMEM;
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data = vzalloc(pblk->max_write_pgs * geo->sec_size);
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if (!data) {
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ret = -ENOMEM;
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goto free_rq;
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}
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pad_rq->pblk = pblk;
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init_completion(&pad_rq->wait);
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kref_init(&pad_rq->ref);
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next_pad_rq:
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rq_ppas = pblk_calc_secs(pblk, left_ppas, 0);
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if (!rq_ppas)
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rq_ppas = pblk->min_write_pgs;
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if (rq_ppas < pblk->min_write_pgs) {
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pr_err("pblk: corrupted pad line %d\n", line->id);
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goto free_rq;
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}
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rq_len = rq_ppas * geo->sec_size;
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meta_list = nvm_dev_dma_alloc(dev->parent, GFP_KERNEL, &dma_meta_list);
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if (!meta_list) {
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ret = -ENOMEM;
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goto free_data;
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}
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ppa_list = (void *)(meta_list) + pblk_dma_meta_size;
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dma_ppa_list = dma_meta_list + pblk_dma_meta_size;
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rqd = pblk_alloc_rqd(pblk, WRITE);
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if (IS_ERR(rqd)) {
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ret = PTR_ERR(rqd);
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goto fail_free_meta;
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}
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memset(rqd, 0, pblk_w_rq_size);
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bio = bio_map_kern(dev->q, data, rq_len, GFP_KERNEL);
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if (IS_ERR(bio))
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return PTR_ERR(bio);
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if (IS_ERR(bio)) {
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ret = PTR_ERR(bio);
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goto fail_free_rqd;
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}
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bio->bi_iter.bi_sector = 0; /* internal bio */
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bio_set_op_attrs(bio, REQ_OP_WRITE, 0);
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memset(rqd, 0, pblk_g_rq_size);
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rqd->bio = bio;
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rqd->opcode = NVM_OP_PWRITE;
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rqd->flags = pblk_set_progr_mode(pblk, WRITE);
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@ -376,8 +423,8 @@ next_pad_rq:
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rqd->ppa_list = ppa_list;
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rqd->dma_ppa_list = dma_ppa_list;
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rqd->dma_meta_list = dma_meta_list;
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rqd->end_io = pblk_end_io_sync;
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rqd->private = &wait;
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rqd->end_io = pblk_end_io_recov;
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rqd->private = pad_rq;
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for (i = 0; i < rqd->nr_ppas; ) {
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struct ppa_addr ppa;
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@ -405,25 +452,41 @@ next_pad_rq:
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}
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}
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kref_get(&pad_rq->ref);
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ret = pblk_submit_io(pblk, rqd);
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if (ret) {
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pr_err("pblk: I/O submission failed: %d\n", ret);
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return ret;
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goto free_data;
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}
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if (!wait_for_completion_io_timeout(&wait,
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msecs_to_jiffies(PBLK_COMMAND_TIMEOUT_MS))) {
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pr_err("pblk: L2P recovery write timed out\n");
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}
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atomic_dec(&pblk->inflight_io);
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reinit_completion(&wait);
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left_line_ppas -= rq_ppas;
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left_ppas -= rq_ppas;
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if (left_ppas > 0 && left_line_ppas)
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if (left_ppas && left_line_ppas)
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goto next_pad_rq;
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return 0;
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kref_put(&pad_rq->ref, pblk_recov_complete);
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if (!wait_for_completion_io_timeout(&pad_rq->wait,
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msecs_to_jiffies(PBLK_COMMAND_TIMEOUT_MS))) {
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pr_err("pblk: pad write timed out\n");
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ret = -ETIME;
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}
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free_rq:
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kfree(pad_rq);
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free_data:
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vfree(data);
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return ret;
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fail_free_rqd:
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pblk_free_rqd(pblk, rqd, WRITE);
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fail_free_meta:
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nvm_dev_dma_free(dev->parent, meta_list, dma_meta_list);
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kfree(pad_rq);
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return ret;
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}
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/* When this function is called, it means that not all upper pages have been
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@ -555,7 +618,7 @@ next_rq:
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if (pad_secs > line->left_msecs)
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pad_secs = line->left_msecs;
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ret = pblk_recov_pad_oob(pblk, line, p, pad_secs);
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ret = pblk_recov_pad_oob(pblk, line, pad_secs);
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if (ret)
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pr_err("pblk: OOB padding failed (err:%d)\n", ret);
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@ -961,64 +1024,22 @@ out:
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*/
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int pblk_recov_pad(struct pblk *pblk)
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{
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struct nvm_tgt_dev *dev = pblk->dev;
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struct nvm_geo *geo = &dev->geo;
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struct pblk_line *line;
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struct pblk_line_mgmt *l_mg = &pblk->l_mg;
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struct nvm_rq *rqd;
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struct pblk_recov_alloc p;
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struct ppa_addr *ppa_list;
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struct pblk_sec_meta *meta_list;
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void *data;
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int left_msecs;
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int ret = 0;
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dma_addr_t dma_ppa_list, dma_meta_list;
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spin_lock(&l_mg->free_lock);
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line = l_mg->data_line;
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left_msecs = line->left_msecs;
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spin_unlock(&l_mg->free_lock);
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rqd = pblk_alloc_rqd(pblk, READ);
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if (IS_ERR(rqd))
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return PTR_ERR(rqd);
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meta_list = nvm_dev_dma_alloc(dev->parent, GFP_KERNEL, &dma_meta_list);
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if (!meta_list) {
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ret = -ENOMEM;
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goto free_rqd;
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}
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ppa_list = (void *)(meta_list) + pblk_dma_meta_size;
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dma_ppa_list = dma_meta_list + pblk_dma_meta_size;
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data = kcalloc(pblk->max_write_pgs, geo->sec_size, GFP_KERNEL);
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if (!data) {
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ret = -ENOMEM;
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goto free_meta_list;
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}
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p.ppa_list = ppa_list;
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p.meta_list = meta_list;
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p.rqd = rqd;
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p.data = data;
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p.dma_ppa_list = dma_ppa_list;
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p.dma_meta_list = dma_meta_list;
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ret = pblk_recov_pad_oob(pblk, line, p, left_msecs);
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ret = pblk_recov_pad_oob(pblk, line, left_msecs);
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if (ret) {
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pr_err("pblk: Tear down padding failed (%d)\n", ret);
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goto free_data;
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return ret;
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}
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pblk_line_close_meta(pblk, line);
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free_data:
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kfree(data);
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free_meta_list:
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nvm_dev_dma_free(dev->parent, meta_list, dma_meta_list);
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free_rqd:
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pblk_free_rqd(pblk, rqd, READ);
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return ret;
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}
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@ -190,7 +190,7 @@ static void pblk_end_io_write_meta(struct nvm_rq *rqd)
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if (rqd->error) {
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pblk_log_write_err(pblk, rqd);
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pr_err("pblk: metadata I/O failed\n");
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pr_err("pblk: metadata I/O failed. Line %d\n", line->id);
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}
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#ifdef CONFIG_NVM_DEBUG
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else
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@ -111,6 +111,13 @@ struct pblk_g_ctx {
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void *private;
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};
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/* Pad context */
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struct pblk_pad_rq {
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struct pblk *pblk;
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struct completion wait;
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struct kref ref;
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};
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/* Recovery context */
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struct pblk_rec_ctx {
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struct pblk *pblk;
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@ -674,6 +681,7 @@ void pblk_rb_sync_end(struct pblk_rb *rb, unsigned long *flags);
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unsigned int pblk_rb_sync_point_count(struct pblk_rb *rb);
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unsigned int pblk_rb_read_count(struct pblk_rb *rb);
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unsigned int pblk_rb_sync_count(struct pblk_rb *rb);
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unsigned int pblk_rb_wrap_pos(struct pblk_rb *rb, unsigned int pos);
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int pblk_rb_tear_down_check(struct pblk_rb *rb);
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