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path: root/drivers/lightnvm/pblk-write.c
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Diffstat (limited to 'drivers/lightnvm/pblk-write.c')
-rw-r--r--drivers/lightnvm/pblk-write.c665
1 files changed, 0 insertions, 665 deletions
diff --git a/drivers/lightnvm/pblk-write.c b/drivers/lightnvm/pblk-write.c
deleted file mode 100644
index b9a2aeba95ab..000000000000
--- a/drivers/lightnvm/pblk-write.c
+++ /dev/null
@@ -1,665 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * Copyright (C) 2016 CNEX Labs
- * Initial release: Javier Gonzalez <javier@cnexlabs.com>
- * Matias Bjorling <matias@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-write.c - pblk's write path from write buffer to media
- */
-
-#include "pblk.h"
-#include "pblk-trace.h"
-
-static unsigned long pblk_end_w_bio(struct pblk *pblk, struct nvm_rq *rqd,
- struct pblk_c_ctx *c_ctx)
-{
- struct bio *original_bio;
- struct pblk_rb *rwb = &pblk->rwb;
- unsigned long ret;
- int i;
-
- for (i = 0; i < c_ctx->nr_valid; i++) {
- struct pblk_w_ctx *w_ctx;
- int pos = c_ctx->sentry + i;
- int flags;
-
- w_ctx = pblk_rb_w_ctx(rwb, pos);
- flags = READ_ONCE(w_ctx->flags);
-
- if (flags & PBLK_FLUSH_ENTRY) {
- flags &= ~PBLK_FLUSH_ENTRY;
- /* Release flags on context. Protect from writes */
- smp_store_release(&w_ctx->flags, flags);
-
-#ifdef CONFIG_NVM_PBLK_DEBUG
- atomic_dec(&rwb->inflight_flush_point);
-#endif
- }
-
- while ((original_bio = bio_list_pop(&w_ctx->bios)))
- bio_endio(original_bio);
- }
-
- if (c_ctx->nr_padded)
- pblk_bio_free_pages(pblk, rqd->bio, c_ctx->nr_valid,
- c_ctx->nr_padded);
-
-#ifdef CONFIG_NVM_PBLK_DEBUG
- atomic_long_add(rqd->nr_ppas, &pblk->sync_writes);
-#endif
-
- ret = pblk_rb_sync_advance(&pblk->rwb, c_ctx->nr_valid);
-
- bio_put(rqd->bio);
- pblk_free_rqd(pblk, rqd, PBLK_WRITE);
-
- return ret;
-}
-
-static unsigned long pblk_end_queued_w_bio(struct pblk *pblk,
- struct nvm_rq *rqd,
- struct pblk_c_ctx *c_ctx)
-{
- list_del(&c_ctx->list);
- return pblk_end_w_bio(pblk, rqd, c_ctx);
-}
-
-static void pblk_complete_write(struct pblk *pblk, struct nvm_rq *rqd,
- struct pblk_c_ctx *c_ctx)
-{
- struct pblk_c_ctx *c, *r;
- unsigned long flags;
- unsigned long pos;
-
-#ifdef CONFIG_NVM_PBLK_DEBUG
- atomic_long_sub(c_ctx->nr_valid, &pblk->inflight_writes);
-#endif
- pblk_up_rq(pblk, c_ctx->lun_bitmap);
-
- pos = pblk_rb_sync_init(&pblk->rwb, &flags);
- if (pos == c_ctx->sentry) {
- pos = pblk_end_w_bio(pblk, rqd, c_ctx);
-
-retry:
- list_for_each_entry_safe(c, r, &pblk->compl_list, list) {
- rqd = nvm_rq_from_c_ctx(c);
- if (c->sentry == pos) {
- pos = pblk_end_queued_w_bio(pblk, rqd, c);
- goto retry;
- }
- }
- } else {
- WARN_ON(nvm_rq_from_c_ctx(c_ctx) != rqd);
- list_add_tail(&c_ctx->list, &pblk->compl_list);
- }
- pblk_rb_sync_end(&pblk->rwb, &flags);
-}
-
-/* Map remaining sectors in chunk, starting from ppa */
-static void pblk_map_remaining(struct pblk *pblk, struct ppa_addr *ppa,
- int rqd_ppas)
-{
- struct pblk_line *line;
- struct ppa_addr map_ppa = *ppa;
- __le64 addr_empty = cpu_to_le64(ADDR_EMPTY);
- __le64 *lba_list;
- u64 paddr;
- int done = 0;
- int n = 0;
-
- line = pblk_ppa_to_line(pblk, *ppa);
- lba_list = emeta_to_lbas(pblk, line->emeta->buf);
-
- spin_lock(&line->lock);
-
- while (!done) {
- paddr = pblk_dev_ppa_to_line_addr(pblk, map_ppa);
-
- if (!test_and_set_bit(paddr, line->map_bitmap))
- line->left_msecs--;
-
- if (n < rqd_ppas && lba_list[paddr] != addr_empty)
- line->nr_valid_lbas--;
-
- lba_list[paddr] = addr_empty;
-
- if (!test_and_set_bit(paddr, line->invalid_bitmap))
- le32_add_cpu(line->vsc, -1);
-
- done = nvm_next_ppa_in_chk(pblk->dev, &map_ppa);
-
- n++;
- }
-
- line->w_err_gc->has_write_err = 1;
- spin_unlock(&line->lock);
-}
-
-static void pblk_prepare_resubmit(struct pblk *pblk, unsigned int sentry,
- unsigned int nr_entries)
-{
- struct pblk_rb *rb = &pblk->rwb;
- struct pblk_rb_entry *entry;
- struct pblk_line *line;
- struct pblk_w_ctx *w_ctx;
- struct ppa_addr ppa_l2p;
- int flags;
- unsigned int i;
-
- spin_lock(&pblk->trans_lock);
- for (i = 0; i < nr_entries; i++) {
- entry = &rb->entries[pblk_rb_ptr_wrap(rb, sentry, i)];
- w_ctx = &entry->w_ctx;
-
- /* Check if the lba has been overwritten */
- if (w_ctx->lba != ADDR_EMPTY) {
- ppa_l2p = pblk_trans_map_get(pblk, w_ctx->lba);
- if (!pblk_ppa_comp(ppa_l2p, entry->cacheline))
- w_ctx->lba = ADDR_EMPTY;
- }
-
- /* Mark up the entry as submittable again */
- flags = READ_ONCE(w_ctx->flags);
- flags |= PBLK_WRITTEN_DATA;
- /* Release flags on write context. Protect from writes */
- smp_store_release(&w_ctx->flags, flags);
-
- /* Decrease the reference count to the line as we will
- * re-map these entries
- */
- line = pblk_ppa_to_line(pblk, w_ctx->ppa);
- atomic_dec(&line->sec_to_update);
- kref_put(&line->ref, pblk_line_put);
- }
- spin_unlock(&pblk->trans_lock);
-}
-
-static void pblk_queue_resubmit(struct pblk *pblk, struct pblk_c_ctx *c_ctx)
-{
- struct pblk_c_ctx *r_ctx;
-
- r_ctx = kzalloc(sizeof(struct pblk_c_ctx), GFP_KERNEL);
- if (!r_ctx)
- return;
-
- r_ctx->lun_bitmap = NULL;
- r_ctx->sentry = c_ctx->sentry;
- r_ctx->nr_valid = c_ctx->nr_valid;
- r_ctx->nr_padded = c_ctx->nr_padded;
-
- spin_lock(&pblk->resubmit_lock);
- list_add_tail(&r_ctx->list, &pblk->resubmit_list);
- spin_unlock(&pblk->resubmit_lock);
-
-#ifdef CONFIG_NVM_PBLK_DEBUG
- atomic_long_add(c_ctx->nr_valid, &pblk->recov_writes);
-#endif
-}
-
-static void pblk_submit_rec(struct work_struct *work)
-{
- struct pblk_rec_ctx *recovery =
- container_of(work, struct pblk_rec_ctx, ws_rec);
- struct pblk *pblk = recovery->pblk;
- struct nvm_rq *rqd = recovery->rqd;
- struct pblk_c_ctx *c_ctx = nvm_rq_to_pdu(rqd);
- struct ppa_addr *ppa_list = nvm_rq_to_ppa_list(rqd);
-
- pblk_log_write_err(pblk, rqd);
-
- pblk_map_remaining(pblk, ppa_list, rqd->nr_ppas);
- pblk_queue_resubmit(pblk, c_ctx);
-
- pblk_up_rq(pblk, c_ctx->lun_bitmap);
- if (c_ctx->nr_padded)
- pblk_bio_free_pages(pblk, rqd->bio, c_ctx->nr_valid,
- c_ctx->nr_padded);
- bio_put(rqd->bio);
- pblk_free_rqd(pblk, rqd, PBLK_WRITE);
- mempool_free(recovery, &pblk->rec_pool);
-
- atomic_dec(&pblk->inflight_io);
- pblk_write_kick(pblk);
-}
-
-
-static void pblk_end_w_fail(struct pblk *pblk, struct nvm_rq *rqd)
-{
- struct pblk_rec_ctx *recovery;
-
- recovery = mempool_alloc(&pblk->rec_pool, GFP_ATOMIC);
- if (!recovery) {
- pblk_err(pblk, "could not allocate recovery work\n");
- return;
- }
-
- recovery->pblk = pblk;
- recovery->rqd = rqd;
-
- INIT_WORK(&recovery->ws_rec, pblk_submit_rec);
- queue_work(pblk->close_wq, &recovery->ws_rec);
-}
-
-static void pblk_end_io_write(struct nvm_rq *rqd)
-{
- struct pblk *pblk = rqd->private;
- struct pblk_c_ctx *c_ctx = nvm_rq_to_pdu(rqd);
-
- if (rqd->error) {
- pblk_end_w_fail(pblk, rqd);
- return;
- } else {
- if (trace_pblk_chunk_state_enabled())
- pblk_check_chunk_state_update(pblk, rqd);
-#ifdef CONFIG_NVM_PBLK_DEBUG
- WARN_ONCE(rqd->bio->bi_status, "pblk: corrupted write error\n");
-#endif
- }
-
- pblk_complete_write(pblk, rqd, c_ctx);
- atomic_dec(&pblk->inflight_io);
-}
-
-static void pblk_end_io_write_meta(struct nvm_rq *rqd)
-{
- struct pblk *pblk = rqd->private;
- struct pblk_g_ctx *m_ctx = nvm_rq_to_pdu(rqd);
- struct pblk_line *line = m_ctx->private;
- struct pblk_emeta *emeta = line->emeta;
- struct ppa_addr *ppa_list = nvm_rq_to_ppa_list(rqd);
- int sync;
-
- pblk_up_chunk(pblk, ppa_list[0]);
-
- if (rqd->error) {
- pblk_log_write_err(pblk, rqd);
- pblk_err(pblk, "metadata I/O failed. Line %d\n", line->id);
- line->w_err_gc->has_write_err = 1;
- } else {
- if (trace_pblk_chunk_state_enabled())
- pblk_check_chunk_state_update(pblk, rqd);
- }
-
- sync = atomic_add_return(rqd->nr_ppas, &emeta->sync);
- if (sync == emeta->nr_entries)
- pblk_gen_run_ws(pblk, line, NULL, pblk_line_close_ws,
- GFP_ATOMIC, pblk->close_wq);
-
- pblk_free_rqd(pblk, rqd, PBLK_WRITE_INT);
-
- atomic_dec(&pblk->inflight_io);
-}
-
-static int pblk_alloc_w_rq(struct pblk *pblk, struct nvm_rq *rqd,
- unsigned int nr_secs, nvm_end_io_fn(*end_io))
-{
- /* Setup write request */
- rqd->opcode = NVM_OP_PWRITE;
- rqd->nr_ppas = nr_secs;
- rqd->is_seq = 1;
- rqd->private = pblk;
- rqd->end_io = end_io;
-
- return pblk_alloc_rqd_meta(pblk, rqd);
-}
-
-static int pblk_setup_w_rq(struct pblk *pblk, struct nvm_rq *rqd,
- struct ppa_addr *erase_ppa)
-{
- struct pblk_line_meta *lm = &pblk->lm;
- struct pblk_line *e_line = pblk_line_get_erase(pblk);
- struct pblk_c_ctx *c_ctx = nvm_rq_to_pdu(rqd);
- unsigned int valid = c_ctx->nr_valid;
- unsigned int padded = c_ctx->nr_padded;
- unsigned int nr_secs = valid + padded;
- unsigned long *lun_bitmap;
- int ret;
-
- lun_bitmap = kzalloc(lm->lun_bitmap_len, GFP_KERNEL);
- if (!lun_bitmap)
- return -ENOMEM;
- c_ctx->lun_bitmap = lun_bitmap;
-
- ret = pblk_alloc_w_rq(pblk, rqd, nr_secs, pblk_end_io_write);
- if (ret) {
- kfree(lun_bitmap);
- return ret;
- }
-
- if (likely(!e_line || !atomic_read(&e_line->left_eblks)))
- ret = pblk_map_rq(pblk, rqd, c_ctx->sentry, lun_bitmap,
- valid, 0);
- else
- ret = pblk_map_erase_rq(pblk, rqd, c_ctx->sentry, lun_bitmap,
- valid, erase_ppa);
-
- return ret;
-}
-
-static int pblk_calc_secs_to_sync(struct pblk *pblk, unsigned int secs_avail,
- unsigned int secs_to_flush)
-{
- int secs_to_sync;
-
- secs_to_sync = pblk_calc_secs(pblk, secs_avail, secs_to_flush, true);
-
-#ifdef CONFIG_NVM_PBLK_DEBUG
- if ((!secs_to_sync && secs_to_flush)
- || (secs_to_sync < 0)
- || (secs_to_sync > secs_avail && !secs_to_flush)) {
- pblk_err(pblk, "bad sector calculation (a:%d,s:%d,f:%d)\n",
- secs_avail, secs_to_sync, secs_to_flush);
- }
-#endif
-
- return secs_to_sync;
-}
-
-int pblk_submit_meta_io(struct pblk *pblk, struct pblk_line *meta_line)
-{
- struct nvm_tgt_dev *dev = pblk->dev;
- struct nvm_geo *geo = &dev->geo;
- struct pblk_line_mgmt *l_mg = &pblk->l_mg;
- struct pblk_line_meta *lm = &pblk->lm;
- struct pblk_emeta *emeta = meta_line->emeta;
- struct ppa_addr *ppa_list;
- struct pblk_g_ctx *m_ctx;
- struct nvm_rq *rqd;
- void *data;
- u64 paddr;
- int rq_ppas = pblk->min_write_pgs;
- int id = meta_line->id;
- int rq_len;
- int i, j;
- int ret;
-
- rqd = pblk_alloc_rqd(pblk, PBLK_WRITE_INT);
-
- m_ctx = nvm_rq_to_pdu(rqd);
- m_ctx->private = meta_line;
-
- rq_len = rq_ppas * geo->csecs;
- data = ((void *)emeta->buf) + emeta->mem;
-
- ret = pblk_alloc_w_rq(pblk, rqd, rq_ppas, pblk_end_io_write_meta);
- if (ret)
- goto fail_free_rqd;
-
- ppa_list = nvm_rq_to_ppa_list(rqd);
- for (i = 0; i < rqd->nr_ppas; ) {
- spin_lock(&meta_line->lock);
- paddr = __pblk_alloc_page(pblk, meta_line, rq_ppas);
- spin_unlock(&meta_line->lock);
- for (j = 0; j < rq_ppas; j++, i++, paddr++)
- ppa_list[i] = addr_to_gen_ppa(pblk, paddr, id);
- }
-
- spin_lock(&l_mg->close_lock);
- emeta->mem += rq_len;
- if (emeta->mem >= lm->emeta_len[0])
- list_del(&meta_line->list);
- spin_unlock(&l_mg->close_lock);
-
- pblk_down_chunk(pblk, ppa_list[0]);
-
- ret = pblk_submit_io(pblk, rqd, data);
- if (ret) {
- pblk_err(pblk, "emeta I/O submission failed: %d\n", ret);
- goto fail_rollback;
- }
-
- return NVM_IO_OK;
-
-fail_rollback:
- pblk_up_chunk(pblk, ppa_list[0]);
- spin_lock(&l_mg->close_lock);
- pblk_dealloc_page(pblk, meta_line, rq_ppas);
- list_add(&meta_line->list, &meta_line->list);
- spin_unlock(&l_mg->close_lock);
-fail_free_rqd:
- pblk_free_rqd(pblk, rqd, PBLK_WRITE_INT);
- return ret;
-}
-
-static inline bool pblk_valid_meta_ppa(struct pblk *pblk,
- struct pblk_line *meta_line,
- struct nvm_rq *data_rqd)
-{
- struct nvm_tgt_dev *dev = pblk->dev;
- struct nvm_geo *geo = &dev->geo;
- struct pblk_c_ctx *data_c_ctx = nvm_rq_to_pdu(data_rqd);
- struct pblk_line *data_line = pblk_line_get_data(pblk);
- struct ppa_addr ppa, ppa_opt;
- u64 paddr;
- int pos_opt;
-
- /* Schedule a metadata I/O that is half the distance from the data I/O
- * with regards to the number of LUNs forming the pblk instance. This
- * balances LUN conflicts across every I/O.
- *
- * When the LUN configuration changes (e.g., due to GC), this distance
- * can align, which would result on metadata and data I/Os colliding. In
- * this case, modify the distance to not be optimal, but move the
- * optimal in the right direction.
- */
- paddr = pblk_lookup_page(pblk, meta_line);
- ppa = addr_to_gen_ppa(pblk, paddr, 0);
- ppa_opt = addr_to_gen_ppa(pblk, paddr + data_line->meta_distance, 0);
- pos_opt = pblk_ppa_to_pos(geo, ppa_opt);
-
- if (test_bit(pos_opt, data_c_ctx->lun_bitmap) ||
- test_bit(pos_opt, data_line->blk_bitmap))
- return true;
-
- if (unlikely(pblk_ppa_comp(ppa_opt, ppa)))
- data_line->meta_distance--;
-
- return false;
-}
-
-static struct pblk_line *pblk_should_submit_meta_io(struct pblk *pblk,
- struct nvm_rq *data_rqd)
-{
- struct pblk_line_meta *lm = &pblk->lm;
- struct pblk_line_mgmt *l_mg = &pblk->l_mg;
- struct pblk_line *meta_line;
-
- spin_lock(&l_mg->close_lock);
- if (list_empty(&l_mg->emeta_list)) {
- spin_unlock(&l_mg->close_lock);
- return NULL;
- }
- meta_line = list_first_entry(&l_mg->emeta_list, struct pblk_line, list);
- if (meta_line->emeta->mem >= lm->emeta_len[0]) {
- spin_unlock(&l_mg->close_lock);
- return NULL;
- }
- spin_unlock(&l_mg->close_lock);
-
- if (!pblk_valid_meta_ppa(pblk, meta_line, data_rqd))
- return NULL;
-
- return meta_line;
-}
-
-static int pblk_submit_io_set(struct pblk *pblk, struct nvm_rq *rqd)
-{
- struct ppa_addr erase_ppa;
- struct pblk_line *meta_line;
- int err;
-
- pblk_ppa_set_empty(&erase_ppa);
-
- /* Assign lbas to ppas and populate request structure */
- err = pblk_setup_w_rq(pblk, rqd, &erase_ppa);
- if (err) {
- pblk_err(pblk, "could not setup write request: %d\n", err);
- return NVM_IO_ERR;
- }
-
- meta_line = pblk_should_submit_meta_io(pblk, rqd);
-
- /* Submit data write for current data line */
- err = pblk_submit_io(pblk, rqd, NULL);
- if (err) {
- pblk_err(pblk, "data I/O submission failed: %d\n", err);
- return NVM_IO_ERR;
- }
-
- if (!pblk_ppa_empty(erase_ppa)) {
- /* Submit erase for next data line */
- if (pblk_blk_erase_async(pblk, erase_ppa)) {
- struct pblk_line *e_line = pblk_line_get_erase(pblk);
- struct nvm_tgt_dev *dev = pblk->dev;
- struct nvm_geo *geo = &dev->geo;
- int bit;
-
- atomic_inc(&e_line->left_eblks);
- bit = pblk_ppa_to_pos(geo, erase_ppa);
- WARN_ON(!test_and_clear_bit(bit, e_line->erase_bitmap));
- }
- }
-
- if (meta_line) {
- /* Submit metadata write for previous data line */
- err = pblk_submit_meta_io(pblk, meta_line);
- if (err) {
- pblk_err(pblk, "metadata I/O submission failed: %d",
- err);
- return NVM_IO_ERR;
- }
- }
-
- return NVM_IO_OK;
-}
-
-static void pblk_free_write_rqd(struct pblk *pblk, struct nvm_rq *rqd)
-{
- struct pblk_c_ctx *c_ctx = nvm_rq_to_pdu(rqd);
- struct bio *bio = rqd->bio;
-
- if (c_ctx->nr_padded)
- pblk_bio_free_pages(pblk, bio, c_ctx->nr_valid,
- c_ctx->nr_padded);
-}
-
-static int pblk_submit_write(struct pblk *pblk, int *secs_left)
-{
- struct bio *bio;
- struct nvm_rq *rqd;
- unsigned int secs_avail, secs_to_sync, secs_to_com;
- unsigned int secs_to_flush, packed_meta_pgs;
- unsigned long pos;
- unsigned int resubmit;
-
- *secs_left = 0;
-
- spin_lock(&pblk->resubmit_lock);
- resubmit = !list_empty(&pblk->resubmit_list);
- spin_unlock(&pblk->resubmit_lock);
-
- /* Resubmit failed writes first */
- if (resubmit) {
- struct pblk_c_ctx *r_ctx;
-
- spin_lock(&pblk->resubmit_lock);
- r_ctx = list_first_entry(&pblk->resubmit_list,
- struct pblk_c_ctx, list);
- list_del(&r_ctx->list);
- spin_unlock(&pblk->resubmit_lock);
-
- secs_avail = r_ctx->nr_valid;
- pos = r_ctx->sentry;
-
- pblk_prepare_resubmit(pblk, pos, secs_avail);
- secs_to_sync = pblk_calc_secs_to_sync(pblk, secs_avail,
- secs_avail);
-
- kfree(r_ctx);
- } else {
- /* If there are no sectors in the cache,
- * flushes (bios without data) will be cleared on
- * the cache threads
- */
- secs_avail = pblk_rb_read_count(&pblk->rwb);
- if (!secs_avail)
- return 0;
-
- secs_to_flush = pblk_rb_flush_point_count(&pblk->rwb);
- if (!secs_to_flush && secs_avail < pblk->min_write_pgs_data)
- return 0;
-
- secs_to_sync = pblk_calc_secs_to_sync(pblk, secs_avail,
- secs_to_flush);
- if (secs_to_sync > pblk->max_write_pgs) {
- pblk_err(pblk, "bad buffer sync calculation\n");
- return 0;
- }
-
- secs_to_com = (secs_to_sync > secs_avail) ?
- secs_avail : secs_to_sync;
- pos = pblk_rb_read_commit(&pblk->rwb, secs_to_com);
- }
-
- packed_meta_pgs = (pblk->min_write_pgs - pblk->min_write_pgs_data);
- bio = bio_alloc(GFP_KERNEL, secs_to_sync + packed_meta_pgs);
-
- bio->bi_iter.bi_sector = 0; /* internal bio */
- bio_set_op_attrs(bio, REQ_OP_WRITE, 0);
-
- rqd = pblk_alloc_rqd(pblk, PBLK_WRITE);
- rqd->bio = bio;
-
- if (pblk_rb_read_to_bio(&pblk->rwb, rqd, pos, secs_to_sync,
- secs_avail)) {
- pblk_err(pblk, "corrupted write bio\n");
- goto fail_put_bio;
- }
-
- if (pblk_submit_io_set(pblk, rqd))
- goto fail_free_bio;
-
-#ifdef CONFIG_NVM_PBLK_DEBUG
- atomic_long_add(secs_to_sync, &pblk->sub_writes);
-#endif
-
- *secs_left = 1;
- return 0;
-
-fail_free_bio:
- pblk_free_write_rqd(pblk, rqd);
-fail_put_bio:
- bio_put(bio);
- pblk_free_rqd(pblk, rqd, PBLK_WRITE);
-
- return -EINTR;
-}
-
-int pblk_write_ts(void *data)
-{
- struct pblk *pblk = data;
- int secs_left;
- int write_failure = 0;
-
- while (!kthread_should_stop()) {
- if (!write_failure) {
- write_failure = pblk_submit_write(pblk, &secs_left);
-
- if (secs_left)
- continue;
- }
- set_current_state(TASK_INTERRUPTIBLE);
- io_schedule();
- }
-
- return 0;
-}