diff options
Diffstat (limited to 'drivers/lightnvm/pblk-recovery.c')
-rw-r--r-- | drivers/lightnvm/pblk-recovery.c | 875 |
1 files changed, 875 insertions, 0 deletions
diff --git a/drivers/lightnvm/pblk-recovery.c b/drivers/lightnvm/pblk-recovery.c new file mode 100644 index 000000000..299ef47a1 --- /dev/null +++ b/drivers/lightnvm/pblk-recovery.c @@ -0,0 +1,875 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2016 CNEX Labs + * Initial: Javier Gonzalez <javier@cnexlabs.com> + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License version + * 2 as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * pblk-recovery.c - pblk's recovery path + * + * The L2P recovery path is single threaded as the L2P table is updated in order + * following the line sequence ID. + */ + +#include "pblk.h" +#include "pblk-trace.h" + +int pblk_recov_check_emeta(struct pblk *pblk, struct line_emeta *emeta_buf) +{ + u32 crc; + + crc = pblk_calc_emeta_crc(pblk, emeta_buf); + if (le32_to_cpu(emeta_buf->crc) != crc) + return 1; + + if (le32_to_cpu(emeta_buf->header.identifier) != PBLK_MAGIC) + return 1; + + return 0; +} + +static int pblk_recov_l2p_from_emeta(struct pblk *pblk, struct pblk_line *line) +{ + struct nvm_tgt_dev *dev = pblk->dev; + struct nvm_geo *geo = &dev->geo; + struct pblk_line_meta *lm = &pblk->lm; + struct pblk_emeta *emeta = line->emeta; + struct line_emeta *emeta_buf = emeta->buf; + __le64 *lba_list; + u64 data_start, data_end; + u64 nr_valid_lbas, nr_lbas = 0; + u64 i; + + lba_list = emeta_to_lbas(pblk, emeta_buf); + if (!lba_list) + return 1; + + data_start = pblk_line_smeta_start(pblk, line) + lm->smeta_sec; + data_end = line->emeta_ssec; + nr_valid_lbas = le64_to_cpu(emeta_buf->nr_valid_lbas); + + for (i = data_start; i < data_end; i++) { + struct ppa_addr ppa; + int pos; + + ppa = addr_to_gen_ppa(pblk, i, line->id); + pos = pblk_ppa_to_pos(geo, ppa); + + /* Do not update bad blocks */ + if (test_bit(pos, line->blk_bitmap)) + continue; + + if (le64_to_cpu(lba_list[i]) == ADDR_EMPTY) { + spin_lock(&line->lock); + if (test_and_set_bit(i, line->invalid_bitmap)) + WARN_ONCE(1, "pblk: rec. double invalidate:\n"); + else + le32_add_cpu(line->vsc, -1); + spin_unlock(&line->lock); + + continue; + } + + pblk_update_map(pblk, le64_to_cpu(lba_list[i]), ppa); + nr_lbas++; + } + + if (nr_valid_lbas != nr_lbas) + pblk_err(pblk, "line %d - inconsistent lba list(%llu/%llu)\n", + line->id, nr_valid_lbas, nr_lbas); + + line->left_msecs = 0; + + return 0; +} + +static void pblk_update_line_wp(struct pblk *pblk, struct pblk_line *line, + u64 written_secs) +{ + struct pblk_line_mgmt *l_mg = &pblk->l_mg; + int i; + + for (i = 0; i < written_secs; i += pblk->min_write_pgs) + __pblk_alloc_page(pblk, line, pblk->min_write_pgs); + + spin_lock(&l_mg->free_lock); + if (written_secs > line->left_msecs) { + /* + * We have all data sectors written + * and some emeta sectors written too. + */ + line->left_msecs = 0; + } else { + /* We have only some data sectors written. */ + line->left_msecs -= written_secs; + } + spin_unlock(&l_mg->free_lock); +} + +static u64 pblk_sec_in_open_line(struct pblk *pblk, struct pblk_line *line) +{ + struct pblk_line_meta *lm = &pblk->lm; + int nr_bb = bitmap_weight(line->blk_bitmap, lm->blk_per_line); + u64 written_secs = 0; + int valid_chunks = 0; + int i; + + for (i = 0; i < lm->blk_per_line; i++) { + struct nvm_chk_meta *chunk = &line->chks[i]; + + if (chunk->state & NVM_CHK_ST_OFFLINE) + continue; + + written_secs += chunk->wp; + valid_chunks++; + } + + if (lm->blk_per_line - nr_bb != valid_chunks) + pblk_err(pblk, "recovery line %d is bad\n", line->id); + + pblk_update_line_wp(pblk, line, written_secs - lm->smeta_sec); + + return written_secs; +} + +struct pblk_recov_alloc { + struct ppa_addr *ppa_list; + void *meta_list; + struct nvm_rq *rqd; + void *data; + dma_addr_t dma_ppa_list; + dma_addr_t dma_meta_list; +}; + +static void pblk_recov_complete(struct kref *ref) +{ + struct pblk_pad_rq *pad_rq = container_of(ref, struct pblk_pad_rq, ref); + + complete(&pad_rq->wait); +} + +static void pblk_end_io_recov(struct nvm_rq *rqd) +{ + struct ppa_addr *ppa_list = nvm_rq_to_ppa_list(rqd); + struct pblk_pad_rq *pad_rq = rqd->private; + struct pblk *pblk = pad_rq->pblk; + + pblk_up_chunk(pblk, ppa_list[0]); + + pblk_free_rqd(pblk, rqd, PBLK_WRITE_INT); + + atomic_dec(&pblk->inflight_io); + kref_put(&pad_rq->ref, pblk_recov_complete); +} + +/* pad line using line bitmap. */ +static int pblk_recov_pad_line(struct pblk *pblk, struct pblk_line *line, + int left_ppas) +{ + struct nvm_tgt_dev *dev = pblk->dev; + struct nvm_geo *geo = &dev->geo; + void *meta_list; + struct pblk_pad_rq *pad_rq; + struct nvm_rq *rqd; + struct ppa_addr *ppa_list; + void *data; + __le64 *lba_list = emeta_to_lbas(pblk, line->emeta->buf); + u64 w_ptr = line->cur_sec; + int left_line_ppas, rq_ppas; + int i, j; + int ret = 0; + + spin_lock(&line->lock); + left_line_ppas = line->left_msecs; + spin_unlock(&line->lock); + + pad_rq = kmalloc(sizeof(struct pblk_pad_rq), GFP_KERNEL); + if (!pad_rq) + return -ENOMEM; + + data = vzalloc(array_size(pblk->max_write_pgs, geo->csecs)); + if (!data) { + ret = -ENOMEM; + goto free_rq; + } + + pad_rq->pblk = pblk; + init_completion(&pad_rq->wait); + kref_init(&pad_rq->ref); + +next_pad_rq: + rq_ppas = pblk_calc_secs(pblk, left_ppas, 0, false); + if (rq_ppas < pblk->min_write_pgs) { + pblk_err(pblk, "corrupted pad line %d\n", line->id); + goto fail_complete; + } + + rqd = pblk_alloc_rqd(pblk, PBLK_WRITE_INT); + + ret = pblk_alloc_rqd_meta(pblk, rqd); + if (ret) { + pblk_free_rqd(pblk, rqd, PBLK_WRITE_INT); + goto fail_complete; + } + + rqd->bio = NULL; + rqd->opcode = NVM_OP_PWRITE; + rqd->is_seq = 1; + rqd->nr_ppas = rq_ppas; + rqd->end_io = pblk_end_io_recov; + rqd->private = pad_rq; + + ppa_list = nvm_rq_to_ppa_list(rqd); + meta_list = rqd->meta_list; + + for (i = 0; i < rqd->nr_ppas; ) { + struct ppa_addr ppa; + int pos; + + w_ptr = pblk_alloc_page(pblk, line, pblk->min_write_pgs); + ppa = addr_to_gen_ppa(pblk, w_ptr, line->id); + pos = pblk_ppa_to_pos(geo, ppa); + + while (test_bit(pos, line->blk_bitmap)) { + w_ptr += pblk->min_write_pgs; + ppa = addr_to_gen_ppa(pblk, w_ptr, line->id); + pos = pblk_ppa_to_pos(geo, ppa); + } + + for (j = 0; j < pblk->min_write_pgs; j++, i++, w_ptr++) { + struct ppa_addr dev_ppa; + struct pblk_sec_meta *meta; + __le64 addr_empty = cpu_to_le64(ADDR_EMPTY); + + dev_ppa = addr_to_gen_ppa(pblk, w_ptr, line->id); + + pblk_map_invalidate(pblk, dev_ppa); + lba_list[w_ptr] = addr_empty; + meta = pblk_get_meta(pblk, meta_list, i); + meta->lba = addr_empty; + ppa_list[i] = dev_ppa; + } + } + + kref_get(&pad_rq->ref); + pblk_down_chunk(pblk, ppa_list[0]); + + ret = pblk_submit_io(pblk, rqd, data); + if (ret) { + pblk_err(pblk, "I/O submission failed: %d\n", ret); + pblk_up_chunk(pblk, ppa_list[0]); + kref_put(&pad_rq->ref, pblk_recov_complete); + pblk_free_rqd(pblk, rqd, PBLK_WRITE_INT); + goto fail_complete; + } + + left_line_ppas -= rq_ppas; + left_ppas -= rq_ppas; + if (left_ppas && left_line_ppas) + goto next_pad_rq; + +fail_complete: + kref_put(&pad_rq->ref, pblk_recov_complete); + wait_for_completion(&pad_rq->wait); + + if (!pblk_line_is_full(line)) + pblk_err(pblk, "corrupted padded line: %d\n", line->id); + + vfree(data); +free_rq: + kfree(pad_rq); + return ret; +} + +static int pblk_pad_distance(struct pblk *pblk, struct pblk_line *line) +{ + struct nvm_tgt_dev *dev = pblk->dev; + struct nvm_geo *geo = &dev->geo; + int distance = geo->mw_cunits * geo->all_luns * geo->ws_opt; + + return (distance > line->left_msecs) ? line->left_msecs : distance; +} + +/* Return a chunk belonging to a line by stripe(write order) index */ +static struct nvm_chk_meta *pblk_get_stripe_chunk(struct pblk *pblk, + struct pblk_line *line, + int index) +{ + struct nvm_tgt_dev *dev = pblk->dev; + struct nvm_geo *geo = &dev->geo; + struct pblk_lun *rlun; + struct ppa_addr ppa; + int pos; + + rlun = &pblk->luns[index]; + ppa = rlun->bppa; + pos = pblk_ppa_to_pos(geo, ppa); + + return &line->chks[pos]; +} + +static int pblk_line_wps_are_unbalanced(struct pblk *pblk, + struct pblk_line *line) +{ + struct pblk_line_meta *lm = &pblk->lm; + int blk_in_line = lm->blk_per_line; + struct nvm_chk_meta *chunk; + u64 max_wp, min_wp; + int i; + + i = find_first_zero_bit(line->blk_bitmap, blk_in_line); + + /* If there is one or zero good chunks in the line, + * the write pointers can't be unbalanced. + */ + if (i >= (blk_in_line - 1)) + return 0; + + chunk = pblk_get_stripe_chunk(pblk, line, i); + max_wp = chunk->wp; + if (max_wp > pblk->max_write_pgs) + min_wp = max_wp - pblk->max_write_pgs; + else + min_wp = 0; + + i = find_next_zero_bit(line->blk_bitmap, blk_in_line, i + 1); + while (i < blk_in_line) { + chunk = pblk_get_stripe_chunk(pblk, line, i); + if (chunk->wp > max_wp || chunk->wp < min_wp) + return 1; + + i = find_next_zero_bit(line->blk_bitmap, blk_in_line, i + 1); + } + + return 0; +} + +static int pblk_recov_scan_oob(struct pblk *pblk, struct pblk_line *line, + struct pblk_recov_alloc p) +{ + struct nvm_tgt_dev *dev = pblk->dev; + struct pblk_line_meta *lm = &pblk->lm; + struct nvm_geo *geo = &dev->geo; + struct ppa_addr *ppa_list; + void *meta_list; + struct nvm_rq *rqd; + void *data; + dma_addr_t dma_ppa_list, dma_meta_list; + __le64 *lba_list; + u64 paddr = pblk_line_smeta_start(pblk, line) + lm->smeta_sec; + bool padded = false; + int rq_ppas; + int i, j; + int ret; + u64 left_ppas = pblk_sec_in_open_line(pblk, line) - lm->smeta_sec; + + if (pblk_line_wps_are_unbalanced(pblk, line)) + pblk_warn(pblk, "recovering unbalanced line (%d)\n", line->id); + + ppa_list = p.ppa_list; + meta_list = p.meta_list; + rqd = p.rqd; + data = p.data; + dma_ppa_list = p.dma_ppa_list; + dma_meta_list = p.dma_meta_list; + + lba_list = emeta_to_lbas(pblk, line->emeta->buf); + +next_rq: + memset(rqd, 0, pblk_g_rq_size); + + rq_ppas = pblk_calc_secs(pblk, left_ppas, 0, false); + if (!rq_ppas) + rq_ppas = pblk->min_write_pgs; + +retry_rq: + rqd->bio = NULL; + rqd->opcode = NVM_OP_PREAD; + rqd->meta_list = meta_list; + rqd->nr_ppas = rq_ppas; + rqd->ppa_list = ppa_list; + rqd->dma_ppa_list = dma_ppa_list; + rqd->dma_meta_list = dma_meta_list; + ppa_list = nvm_rq_to_ppa_list(rqd); + + if (pblk_io_aligned(pblk, rq_ppas)) + rqd->is_seq = 1; + + for (i = 0; i < rqd->nr_ppas; ) { + struct ppa_addr ppa; + int pos; + + ppa = addr_to_gen_ppa(pblk, paddr, line->id); + pos = pblk_ppa_to_pos(geo, ppa); + + while (test_bit(pos, line->blk_bitmap)) { + paddr += pblk->min_write_pgs; + ppa = addr_to_gen_ppa(pblk, paddr, line->id); + pos = pblk_ppa_to_pos(geo, ppa); + } + + for (j = 0; j < pblk->min_write_pgs; j++, i++) + ppa_list[i] = + addr_to_gen_ppa(pblk, paddr + j, line->id); + } + + ret = pblk_submit_io_sync(pblk, rqd, data); + if (ret) { + pblk_err(pblk, "I/O submission failed: %d\n", ret); + return ret; + } + + atomic_dec(&pblk->inflight_io); + + /* If a read fails, do a best effort by padding the line and retrying */ + if (rqd->error && rqd->error != NVM_RSP_WARN_HIGHECC) { + int pad_distance, ret; + + if (padded) { + pblk_log_read_err(pblk, rqd); + return -EINTR; + } + + pad_distance = pblk_pad_distance(pblk, line); + ret = pblk_recov_pad_line(pblk, line, pad_distance); + if (ret) { + return ret; + } + + padded = true; + goto retry_rq; + } + + pblk_get_packed_meta(pblk, rqd); + + for (i = 0; i < rqd->nr_ppas; i++) { + struct pblk_sec_meta *meta = pblk_get_meta(pblk, meta_list, i); + u64 lba = le64_to_cpu(meta->lba); + + lba_list[paddr++] = cpu_to_le64(lba); + + if (lba == ADDR_EMPTY || lba >= pblk->capacity) + continue; + + line->nr_valid_lbas++; + pblk_update_map(pblk, lba, ppa_list[i]); + } + + left_ppas -= rq_ppas; + if (left_ppas > 0) + goto next_rq; + +#ifdef CONFIG_NVM_PBLK_DEBUG + WARN_ON(padded && !pblk_line_is_full(line)); +#endif + + return 0; +} + +/* Scan line for lbas on out of bound area */ +static int pblk_recov_l2p_from_oob(struct pblk *pblk, struct pblk_line *line) +{ + struct nvm_tgt_dev *dev = pblk->dev; + struct nvm_geo *geo = &dev->geo; + struct nvm_rq *rqd; + struct ppa_addr *ppa_list; + void *meta_list; + struct pblk_recov_alloc p; + void *data; + dma_addr_t dma_ppa_list, dma_meta_list; + int ret = 0; + + meta_list = nvm_dev_dma_alloc(dev->parent, GFP_KERNEL, &dma_meta_list); + if (!meta_list) + return -ENOMEM; + + ppa_list = (void *)(meta_list) + pblk_dma_meta_size(pblk); + dma_ppa_list = dma_meta_list + pblk_dma_meta_size(pblk); + + data = kcalloc(pblk->max_write_pgs, geo->csecs, GFP_KERNEL); + if (!data) { + ret = -ENOMEM; + goto free_meta_list; + } + + rqd = mempool_alloc(&pblk->r_rq_pool, GFP_KERNEL); + memset(rqd, 0, pblk_g_rq_size); + + p.ppa_list = ppa_list; + p.meta_list = meta_list; + p.rqd = rqd; + p.data = data; + p.dma_ppa_list = dma_ppa_list; + p.dma_meta_list = dma_meta_list; + + ret = pblk_recov_scan_oob(pblk, line, p); + if (ret) { + pblk_err(pblk, "could not recover L2P form OOB\n"); + goto out; + } + + if (pblk_line_is_full(line)) + pblk_line_recov_close(pblk, line); + +out: + mempool_free(rqd, &pblk->r_rq_pool); + kfree(data); +free_meta_list: + nvm_dev_dma_free(dev->parent, meta_list, dma_meta_list); + + return ret; +} + +/* Insert lines ordered by sequence number (seq_num) on list */ +static void pblk_recov_line_add_ordered(struct list_head *head, + struct pblk_line *line) +{ + struct pblk_line *t = NULL; + + list_for_each_entry(t, head, list) + if (t->seq_nr > line->seq_nr) + break; + + __list_add(&line->list, t->list.prev, &t->list); +} + +static u64 pblk_line_emeta_start(struct pblk *pblk, struct pblk_line *line) +{ + struct nvm_tgt_dev *dev = pblk->dev; + struct nvm_geo *geo = &dev->geo; + struct pblk_line_meta *lm = &pblk->lm; + unsigned int emeta_secs; + u64 emeta_start; + struct ppa_addr ppa; + int pos; + + emeta_secs = lm->emeta_sec[0]; + emeta_start = lm->sec_per_line; + + while (emeta_secs) { + emeta_start--; + ppa = addr_to_gen_ppa(pblk, emeta_start, line->id); + pos = pblk_ppa_to_pos(geo, ppa); + if (!test_bit(pos, line->blk_bitmap)) + emeta_secs--; + } + + return emeta_start; +} + +static int pblk_recov_check_line_version(struct pblk *pblk, + struct line_emeta *emeta) +{ + struct line_header *header = &emeta->header; + + if (header->version_major != EMETA_VERSION_MAJOR) { + pblk_err(pblk, "line major version mismatch: %d, expected: %d\n", + header->version_major, EMETA_VERSION_MAJOR); + return 1; + } + +#ifdef CONFIG_NVM_PBLK_DEBUG + if (header->version_minor > EMETA_VERSION_MINOR) + pblk_info(pblk, "newer line minor version found: %d\n", + header->version_minor); +#endif + + return 0; +} + +static void pblk_recov_wa_counters(struct pblk *pblk, + struct line_emeta *emeta) +{ + struct pblk_line_meta *lm = &pblk->lm; + struct line_header *header = &emeta->header; + struct wa_counters *wa = emeta_to_wa(lm, emeta); + + /* WA counters were introduced in emeta version 0.2 */ + if (header->version_major > 0 || header->version_minor >= 2) { + u64 user = le64_to_cpu(wa->user); + u64 pad = le64_to_cpu(wa->pad); + u64 gc = le64_to_cpu(wa->gc); + + atomic64_set(&pblk->user_wa, user); + atomic64_set(&pblk->pad_wa, pad); + atomic64_set(&pblk->gc_wa, gc); + + pblk->user_rst_wa = user; + pblk->pad_rst_wa = pad; + pblk->gc_rst_wa = gc; + } +} + +static int pblk_line_was_written(struct pblk_line *line, + struct pblk *pblk) +{ + + struct pblk_line_meta *lm = &pblk->lm; + struct nvm_tgt_dev *dev = pblk->dev; + struct nvm_geo *geo = &dev->geo; + struct nvm_chk_meta *chunk; + struct ppa_addr bppa; + int smeta_blk; + + if (line->state == PBLK_LINESTATE_BAD) + return 0; + + smeta_blk = find_first_zero_bit(line->blk_bitmap, lm->blk_per_line); + if (smeta_blk >= lm->blk_per_line) + return 0; + + bppa = pblk->luns[smeta_blk].bppa; + chunk = &line->chks[pblk_ppa_to_pos(geo, bppa)]; + + if (chunk->state & NVM_CHK_ST_CLOSED || + (chunk->state & NVM_CHK_ST_OPEN + && chunk->wp >= lm->smeta_sec)) + return 1; + + return 0; +} + +static bool pblk_line_is_open(struct pblk *pblk, struct pblk_line *line) +{ + struct pblk_line_meta *lm = &pblk->lm; + int i; + + for (i = 0; i < lm->blk_per_line; i++) + if (line->chks[i].state & NVM_CHK_ST_OPEN) + return true; + + return false; +} + +struct pblk_line *pblk_recov_l2p(struct pblk *pblk) +{ + struct pblk_line_meta *lm = &pblk->lm; + struct pblk_line_mgmt *l_mg = &pblk->l_mg; + struct pblk_line *line, *tline, *data_line = NULL; + struct pblk_smeta *smeta; + struct pblk_emeta *emeta; + struct line_smeta *smeta_buf; + int found_lines = 0, recovered_lines = 0, open_lines = 0; + int is_next = 0; + int meta_line; + int i, valid_uuid = 0; + LIST_HEAD(recov_list); + + /* TODO: Implement FTL snapshot */ + + /* Scan recovery - takes place when FTL snapshot fails */ + spin_lock(&l_mg->free_lock); + meta_line = find_first_zero_bit(&l_mg->meta_bitmap, PBLK_DATA_LINES); + set_bit(meta_line, &l_mg->meta_bitmap); + smeta = l_mg->sline_meta[meta_line]; + emeta = l_mg->eline_meta[meta_line]; + smeta_buf = (struct line_smeta *)smeta; + spin_unlock(&l_mg->free_lock); + + /* Order data lines using their sequence number */ + for (i = 0; i < l_mg->nr_lines; i++) { + u32 crc; + + line = &pblk->lines[i]; + + memset(smeta, 0, lm->smeta_len); + line->smeta = smeta; + line->lun_bitmap = ((void *)(smeta_buf)) + + sizeof(struct line_smeta); + + if (!pblk_line_was_written(line, pblk)) + continue; + + /* Lines that cannot be read are assumed as not written here */ + if (pblk_line_smeta_read(pblk, line)) + continue; + + crc = pblk_calc_smeta_crc(pblk, smeta_buf); + if (le32_to_cpu(smeta_buf->crc) != crc) + continue; + + if (le32_to_cpu(smeta_buf->header.identifier) != PBLK_MAGIC) + continue; + + if (smeta_buf->header.version_major != SMETA_VERSION_MAJOR) { + pblk_err(pblk, "found incompatible line version %u\n", + smeta_buf->header.version_major); + return ERR_PTR(-EINVAL); + } + + /* The first valid instance uuid is used for initialization */ + if (!valid_uuid) { + guid_copy(&pblk->instance_uuid, + (guid_t *)&smeta_buf->header.uuid); + valid_uuid = 1; + } + + if (!guid_equal(&pblk->instance_uuid, + (guid_t *)&smeta_buf->header.uuid)) { + pblk_debug(pblk, "ignore line %u due to uuid mismatch\n", + i); + continue; + } + + /* Update line metadata */ + spin_lock(&line->lock); + line->id = le32_to_cpu(smeta_buf->header.id); + line->type = le16_to_cpu(smeta_buf->header.type); + line->seq_nr = le64_to_cpu(smeta_buf->seq_nr); + spin_unlock(&line->lock); + + /* Update general metadata */ + spin_lock(&l_mg->free_lock); + if (line->seq_nr >= l_mg->d_seq_nr) + l_mg->d_seq_nr = line->seq_nr + 1; + l_mg->nr_free_lines--; + spin_unlock(&l_mg->free_lock); + + if (pblk_line_recov_alloc(pblk, line)) + goto out; + + pblk_recov_line_add_ordered(&recov_list, line); + found_lines++; + pblk_debug(pblk, "recovering data line %d, seq:%llu\n", + line->id, smeta_buf->seq_nr); + } + + if (!found_lines) { + guid_gen(&pblk->instance_uuid); + + spin_lock(&l_mg->free_lock); + WARN_ON_ONCE(!test_and_clear_bit(meta_line, + &l_mg->meta_bitmap)); + spin_unlock(&l_mg->free_lock); + + goto out; + } + + /* Verify closed blocks and recover this portion of L2P table*/ + list_for_each_entry_safe(line, tline, &recov_list, list) { + recovered_lines++; + + line->emeta_ssec = pblk_line_emeta_start(pblk, line); + line->emeta = emeta; + memset(line->emeta->buf, 0, lm->emeta_len[0]); + + if (pblk_line_is_open(pblk, line)) { + pblk_recov_l2p_from_oob(pblk, line); + goto next; + } + + if (pblk_line_emeta_read(pblk, line, line->emeta->buf)) { + pblk_recov_l2p_from_oob(pblk, line); + goto next; + } + + if (pblk_recov_check_emeta(pblk, line->emeta->buf)) { + pblk_recov_l2p_from_oob(pblk, line); + goto next; + } + + if (pblk_recov_check_line_version(pblk, line->emeta->buf)) + return ERR_PTR(-EINVAL); + + pblk_recov_wa_counters(pblk, line->emeta->buf); + + if (pblk_recov_l2p_from_emeta(pblk, line)) + pblk_recov_l2p_from_oob(pblk, line); + +next: + if (pblk_line_is_full(line)) { + struct list_head *move_list; + + spin_lock(&line->lock); + line->state = PBLK_LINESTATE_CLOSED; + trace_pblk_line_state(pblk_disk_name(pblk), line->id, + line->state); + move_list = pblk_line_gc_list(pblk, line); + spin_unlock(&line->lock); + + spin_lock(&l_mg->gc_lock); + list_move_tail(&line->list, move_list); + spin_unlock(&l_mg->gc_lock); + + mempool_free(line->map_bitmap, l_mg->bitmap_pool); + line->map_bitmap = NULL; + line->smeta = NULL; + line->emeta = NULL; + } else { + spin_lock(&line->lock); + line->state = PBLK_LINESTATE_OPEN; + spin_unlock(&line->lock); + + line->emeta->mem = 0; + atomic_set(&line->emeta->sync, 0); + + trace_pblk_line_state(pblk_disk_name(pblk), line->id, + line->state); + + data_line = line; + line->meta_line = meta_line; + + open_lines++; + } + } + + if (!open_lines) { + spin_lock(&l_mg->free_lock); + WARN_ON_ONCE(!test_and_clear_bit(meta_line, + &l_mg->meta_bitmap)); + spin_unlock(&l_mg->free_lock); + } else { + spin_lock(&l_mg->free_lock); + l_mg->data_line = data_line; + /* Allocate next line for preparation */ + l_mg->data_next = pblk_line_get(pblk); + if (l_mg->data_next) { + l_mg->data_next->seq_nr = l_mg->d_seq_nr++; + l_mg->data_next->type = PBLK_LINETYPE_DATA; + is_next = 1; + } + spin_unlock(&l_mg->free_lock); + } + + if (is_next) + pblk_line_erase(pblk, l_mg->data_next); + +out: + if (found_lines != recovered_lines) + pblk_err(pblk, "failed to recover all found lines %d/%d\n", + found_lines, recovered_lines); + + return data_line; +} + +/* + * Pad current line + */ +int pblk_recov_pad(struct pblk *pblk) +{ + struct pblk_line *line; + struct pblk_line_mgmt *l_mg = &pblk->l_mg; + int left_msecs; + int ret = 0; + + spin_lock(&l_mg->free_lock); + line = l_mg->data_line; + left_msecs = line->left_msecs; + spin_unlock(&l_mg->free_lock); + + ret = pblk_recov_pad_line(pblk, line, left_msecs); + if (ret) { + pblk_err(pblk, "tear down padding failed (%d)\n", ret); + return ret; + } + + pblk_line_close_meta(pblk, line); + return ret; +} |