Revision 7111951b8d4973bda27ff663f2cf18b663d15b48 authored by Linus Torvalds on 29 March 2020, 22:25:41 UTC, committed by Linus Torvalds on 29 March 2020, 22:25:41 UTC
1 parent 570203e
pblk-recovery.c
// 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;
}
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