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![Hans Holmberg](/assets/img/avatar_default.png)
Now that blk_rq_map_kern can map both kmem and vmem, move internal metadata mapping down to the lower level driver. Reviewed-by: Javier González <javier@javigon.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Hans Holmberg <hans@owltronix.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
665 lines
17 KiB
C
665 lines
17 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2016 CNEX Labs
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* Initial release: Javier Gonzalez <javier@cnexlabs.com>
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* Matias Bjorling <matias@cnexlabs.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License version
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* 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* pblk-write.c - pblk's write path from write buffer to media
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*/
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#include "pblk.h"
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#include "pblk-trace.h"
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static unsigned long pblk_end_w_bio(struct pblk *pblk, struct nvm_rq *rqd,
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struct pblk_c_ctx *c_ctx)
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{
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struct bio *original_bio;
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struct pblk_rb *rwb = &pblk->rwb;
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unsigned long ret;
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int i;
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for (i = 0; i < c_ctx->nr_valid; i++) {
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struct pblk_w_ctx *w_ctx;
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int pos = c_ctx->sentry + i;
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int flags;
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w_ctx = pblk_rb_w_ctx(rwb, pos);
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flags = READ_ONCE(w_ctx->flags);
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if (flags & PBLK_FLUSH_ENTRY) {
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flags &= ~PBLK_FLUSH_ENTRY;
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/* Release flags on context. Protect from writes */
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smp_store_release(&w_ctx->flags, flags);
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#ifdef CONFIG_NVM_PBLK_DEBUG
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atomic_dec(&rwb->inflight_flush_point);
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#endif
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}
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while ((original_bio = bio_list_pop(&w_ctx->bios)))
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bio_endio(original_bio);
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}
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if (c_ctx->nr_padded)
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pblk_bio_free_pages(pblk, rqd->bio, c_ctx->nr_valid,
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c_ctx->nr_padded);
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#ifdef CONFIG_NVM_PBLK_DEBUG
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atomic_long_add(rqd->nr_ppas, &pblk->sync_writes);
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#endif
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ret = pblk_rb_sync_advance(&pblk->rwb, c_ctx->nr_valid);
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bio_put(rqd->bio);
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pblk_free_rqd(pblk, rqd, PBLK_WRITE);
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return ret;
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}
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static unsigned long pblk_end_queued_w_bio(struct pblk *pblk,
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struct nvm_rq *rqd,
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struct pblk_c_ctx *c_ctx)
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{
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list_del(&c_ctx->list);
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return pblk_end_w_bio(pblk, rqd, c_ctx);
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}
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static void pblk_complete_write(struct pblk *pblk, struct nvm_rq *rqd,
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struct pblk_c_ctx *c_ctx)
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{
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struct pblk_c_ctx *c, *r;
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unsigned long flags;
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unsigned long pos;
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#ifdef CONFIG_NVM_PBLK_DEBUG
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atomic_long_sub(c_ctx->nr_valid, &pblk->inflight_writes);
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#endif
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pblk_up_rq(pblk, c_ctx->lun_bitmap);
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pos = pblk_rb_sync_init(&pblk->rwb, &flags);
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if (pos == c_ctx->sentry) {
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pos = pblk_end_w_bio(pblk, rqd, c_ctx);
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retry:
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list_for_each_entry_safe(c, r, &pblk->compl_list, list) {
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rqd = nvm_rq_from_c_ctx(c);
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if (c->sentry == pos) {
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pos = pblk_end_queued_w_bio(pblk, rqd, c);
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goto retry;
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}
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}
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} else {
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WARN_ON(nvm_rq_from_c_ctx(c_ctx) != rqd);
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list_add_tail(&c_ctx->list, &pblk->compl_list);
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}
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pblk_rb_sync_end(&pblk->rwb, &flags);
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}
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/* Map remaining sectors in chunk, starting from ppa */
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static void pblk_map_remaining(struct pblk *pblk, struct ppa_addr *ppa,
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int rqd_ppas)
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{
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struct pblk_line *line;
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struct ppa_addr map_ppa = *ppa;
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__le64 addr_empty = cpu_to_le64(ADDR_EMPTY);
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__le64 *lba_list;
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u64 paddr;
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int done = 0;
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int n = 0;
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line = pblk_ppa_to_line(pblk, *ppa);
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lba_list = emeta_to_lbas(pblk, line->emeta->buf);
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spin_lock(&line->lock);
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while (!done) {
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paddr = pblk_dev_ppa_to_line_addr(pblk, map_ppa);
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if (!test_and_set_bit(paddr, line->map_bitmap))
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line->left_msecs--;
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if (n < rqd_ppas && lba_list[paddr] != addr_empty)
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line->nr_valid_lbas--;
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lba_list[paddr] = addr_empty;
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if (!test_and_set_bit(paddr, line->invalid_bitmap))
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le32_add_cpu(line->vsc, -1);
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done = nvm_next_ppa_in_chk(pblk->dev, &map_ppa);
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n++;
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}
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line->w_err_gc->has_write_err = 1;
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spin_unlock(&line->lock);
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}
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static void pblk_prepare_resubmit(struct pblk *pblk, unsigned int sentry,
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unsigned int nr_entries)
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{
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struct pblk_rb *rb = &pblk->rwb;
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struct pblk_rb_entry *entry;
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struct pblk_line *line;
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struct pblk_w_ctx *w_ctx;
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struct ppa_addr ppa_l2p;
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int flags;
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unsigned int i;
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spin_lock(&pblk->trans_lock);
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for (i = 0; i < nr_entries; i++) {
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entry = &rb->entries[pblk_rb_ptr_wrap(rb, sentry, i)];
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w_ctx = &entry->w_ctx;
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/* Check if the lba has been overwritten */
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if (w_ctx->lba != ADDR_EMPTY) {
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ppa_l2p = pblk_trans_map_get(pblk, w_ctx->lba);
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if (!pblk_ppa_comp(ppa_l2p, entry->cacheline))
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w_ctx->lba = ADDR_EMPTY;
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}
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/* Mark up the entry as submittable again */
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flags = READ_ONCE(w_ctx->flags);
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flags |= PBLK_WRITTEN_DATA;
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/* Release flags on write context. Protect from writes */
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smp_store_release(&w_ctx->flags, flags);
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/* Decrease the reference count to the line as we will
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* re-map these entries
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*/
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line = pblk_ppa_to_line(pblk, w_ctx->ppa);
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atomic_dec(&line->sec_to_update);
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kref_put(&line->ref, pblk_line_put);
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}
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spin_unlock(&pblk->trans_lock);
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}
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static void pblk_queue_resubmit(struct pblk *pblk, struct pblk_c_ctx *c_ctx)
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{
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struct pblk_c_ctx *r_ctx;
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r_ctx = kzalloc(sizeof(struct pblk_c_ctx), GFP_KERNEL);
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if (!r_ctx)
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return;
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r_ctx->lun_bitmap = NULL;
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r_ctx->sentry = c_ctx->sentry;
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r_ctx->nr_valid = c_ctx->nr_valid;
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r_ctx->nr_padded = c_ctx->nr_padded;
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spin_lock(&pblk->resubmit_lock);
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list_add_tail(&r_ctx->list, &pblk->resubmit_list);
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spin_unlock(&pblk->resubmit_lock);
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#ifdef CONFIG_NVM_PBLK_DEBUG
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atomic_long_add(c_ctx->nr_valid, &pblk->recov_writes);
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#endif
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}
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static void pblk_submit_rec(struct work_struct *work)
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{
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struct pblk_rec_ctx *recovery =
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container_of(work, struct pblk_rec_ctx, ws_rec);
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struct pblk *pblk = recovery->pblk;
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struct nvm_rq *rqd = recovery->rqd;
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struct pblk_c_ctx *c_ctx = nvm_rq_to_pdu(rqd);
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struct ppa_addr *ppa_list = nvm_rq_to_ppa_list(rqd);
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pblk_log_write_err(pblk, rqd);
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pblk_map_remaining(pblk, ppa_list, rqd->nr_ppas);
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pblk_queue_resubmit(pblk, c_ctx);
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pblk_up_rq(pblk, c_ctx->lun_bitmap);
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if (c_ctx->nr_padded)
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pblk_bio_free_pages(pblk, rqd->bio, c_ctx->nr_valid,
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c_ctx->nr_padded);
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bio_put(rqd->bio);
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pblk_free_rqd(pblk, rqd, PBLK_WRITE);
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mempool_free(recovery, &pblk->rec_pool);
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atomic_dec(&pblk->inflight_io);
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pblk_write_kick(pblk);
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}
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static void pblk_end_w_fail(struct pblk *pblk, struct nvm_rq *rqd)
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{
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struct pblk_rec_ctx *recovery;
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recovery = mempool_alloc(&pblk->rec_pool, GFP_ATOMIC);
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if (!recovery) {
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pblk_err(pblk, "could not allocate recovery work\n");
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return;
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}
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recovery->pblk = pblk;
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recovery->rqd = rqd;
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INIT_WORK(&recovery->ws_rec, pblk_submit_rec);
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queue_work(pblk->close_wq, &recovery->ws_rec);
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}
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static void pblk_end_io_write(struct nvm_rq *rqd)
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{
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struct pblk *pblk = rqd->private;
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struct pblk_c_ctx *c_ctx = nvm_rq_to_pdu(rqd);
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if (rqd->error) {
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pblk_end_w_fail(pblk, rqd);
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return;
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} else {
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if (trace_pblk_chunk_state_enabled())
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pblk_check_chunk_state_update(pblk, rqd);
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#ifdef CONFIG_NVM_PBLK_DEBUG
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WARN_ONCE(rqd->bio->bi_status, "pblk: corrupted write error\n");
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#endif
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}
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pblk_complete_write(pblk, rqd, c_ctx);
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atomic_dec(&pblk->inflight_io);
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}
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static void pblk_end_io_write_meta(struct nvm_rq *rqd)
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{
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struct pblk *pblk = rqd->private;
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struct pblk_g_ctx *m_ctx = nvm_rq_to_pdu(rqd);
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struct pblk_line *line = m_ctx->private;
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struct pblk_emeta *emeta = line->emeta;
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struct ppa_addr *ppa_list = nvm_rq_to_ppa_list(rqd);
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int sync;
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pblk_up_chunk(pblk, ppa_list[0]);
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if (rqd->error) {
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pblk_log_write_err(pblk, rqd);
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pblk_err(pblk, "metadata I/O failed. Line %d\n", line->id);
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line->w_err_gc->has_write_err = 1;
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} else {
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if (trace_pblk_chunk_state_enabled())
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pblk_check_chunk_state_update(pblk, rqd);
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}
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sync = atomic_add_return(rqd->nr_ppas, &emeta->sync);
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if (sync == emeta->nr_entries)
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pblk_gen_run_ws(pblk, line, NULL, pblk_line_close_ws,
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GFP_ATOMIC, pblk->close_wq);
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pblk_free_rqd(pblk, rqd, PBLK_WRITE_INT);
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atomic_dec(&pblk->inflight_io);
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}
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static int pblk_alloc_w_rq(struct pblk *pblk, struct nvm_rq *rqd,
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unsigned int nr_secs, nvm_end_io_fn(*end_io))
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{
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/* Setup write request */
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rqd->opcode = NVM_OP_PWRITE;
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rqd->nr_ppas = nr_secs;
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rqd->is_seq = 1;
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rqd->private = pblk;
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rqd->end_io = end_io;
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return pblk_alloc_rqd_meta(pblk, rqd);
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}
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static int pblk_setup_w_rq(struct pblk *pblk, struct nvm_rq *rqd,
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struct ppa_addr *erase_ppa)
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{
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struct pblk_line_meta *lm = &pblk->lm;
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struct pblk_line *e_line = pblk_line_get_erase(pblk);
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struct pblk_c_ctx *c_ctx = nvm_rq_to_pdu(rqd);
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unsigned int valid = c_ctx->nr_valid;
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unsigned int padded = c_ctx->nr_padded;
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unsigned int nr_secs = valid + padded;
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unsigned long *lun_bitmap;
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int ret;
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lun_bitmap = kzalloc(lm->lun_bitmap_len, GFP_KERNEL);
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if (!lun_bitmap)
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return -ENOMEM;
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c_ctx->lun_bitmap = lun_bitmap;
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ret = pblk_alloc_w_rq(pblk, rqd, nr_secs, pblk_end_io_write);
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if (ret) {
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kfree(lun_bitmap);
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return ret;
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}
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if (likely(!e_line || !atomic_read(&e_line->left_eblks)))
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ret = pblk_map_rq(pblk, rqd, c_ctx->sentry, lun_bitmap,
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valid, 0);
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else
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ret = pblk_map_erase_rq(pblk, rqd, c_ctx->sentry, lun_bitmap,
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valid, erase_ppa);
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return ret;
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}
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static int pblk_calc_secs_to_sync(struct pblk *pblk, unsigned int secs_avail,
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unsigned int secs_to_flush)
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{
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int secs_to_sync;
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secs_to_sync = pblk_calc_secs(pblk, secs_avail, secs_to_flush, true);
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#ifdef CONFIG_NVM_PBLK_DEBUG
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if ((!secs_to_sync && secs_to_flush)
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|| (secs_to_sync < 0)
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|| (secs_to_sync > secs_avail && !secs_to_flush)) {
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pblk_err(pblk, "bad sector calculation (a:%d,s:%d,f:%d)\n",
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secs_avail, secs_to_sync, secs_to_flush);
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}
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#endif
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return secs_to_sync;
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}
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int pblk_submit_meta_io(struct pblk *pblk, struct pblk_line *meta_line)
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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_mgmt *l_mg = &pblk->l_mg;
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struct pblk_line_meta *lm = &pblk->lm;
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struct pblk_emeta *emeta = meta_line->emeta;
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struct ppa_addr *ppa_list;
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struct pblk_g_ctx *m_ctx;
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struct nvm_rq *rqd;
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void *data;
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u64 paddr;
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int rq_ppas = pblk->min_write_pgs;
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int id = meta_line->id;
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int rq_len;
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int i, j;
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int ret;
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rqd = pblk_alloc_rqd(pblk, PBLK_WRITE_INT);
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m_ctx = nvm_rq_to_pdu(rqd);
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m_ctx->private = meta_line;
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rq_len = rq_ppas * geo->csecs;
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data = ((void *)emeta->buf) + emeta->mem;
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ret = pblk_alloc_w_rq(pblk, rqd, rq_ppas, pblk_end_io_write_meta);
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if (ret)
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goto fail_free_rqd;
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ppa_list = nvm_rq_to_ppa_list(rqd);
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for (i = 0; i < rqd->nr_ppas; ) {
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spin_lock(&meta_line->lock);
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paddr = __pblk_alloc_page(pblk, meta_line, rq_ppas);
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spin_unlock(&meta_line->lock);
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for (j = 0; j < rq_ppas; j++, i++, paddr++)
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ppa_list[i] = addr_to_gen_ppa(pblk, paddr, id);
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}
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spin_lock(&l_mg->close_lock);
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emeta->mem += rq_len;
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if (emeta->mem >= lm->emeta_len[0])
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list_del(&meta_line->list);
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spin_unlock(&l_mg->close_lock);
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pblk_down_chunk(pblk, ppa_list[0]);
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ret = pblk_submit_io(pblk, rqd, data);
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if (ret) {
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pblk_err(pblk, "emeta I/O submission failed: %d\n", ret);
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goto fail_rollback;
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}
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return NVM_IO_OK;
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fail_rollback:
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pblk_up_chunk(pblk, ppa_list[0]);
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spin_lock(&l_mg->close_lock);
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pblk_dealloc_page(pblk, meta_line, rq_ppas);
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list_add(&meta_line->list, &meta_line->list);
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spin_unlock(&l_mg->close_lock);
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fail_free_rqd:
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pblk_free_rqd(pblk, rqd, PBLK_WRITE_INT);
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return ret;
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}
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static inline bool pblk_valid_meta_ppa(struct pblk *pblk,
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struct pblk_line *meta_line,
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struct nvm_rq *data_rqd)
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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_c_ctx *data_c_ctx = nvm_rq_to_pdu(data_rqd);
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struct pblk_line *data_line = pblk_line_get_data(pblk);
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struct ppa_addr ppa, ppa_opt;
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u64 paddr;
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int pos_opt;
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/* Schedule a metadata I/O that is half the distance from the data I/O
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* with regards to the number of LUNs forming the pblk instance. This
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* balances LUN conflicts across every I/O.
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*
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* When the LUN configuration changes (e.g., due to GC), this distance
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* can align, which would result on metadata and data I/Os colliding. In
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* 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;
|
|
}
|