linux-imx

// 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-gc.c - pblk's garbage collector

 */

​

#include "pblk.h"

#include "pblk-trace.h"

#include <linux/delay.h>

​

​

static void pblk_gc_free_gc_rq(struct pblk_gc_rq *gc_rq)

{

    if (gc_rq->data)

        vfree(gc_rq->data);

    kfree(gc_rq);

}

​

static int pblk_gc_write(struct pblk *pblk)

{

    struct pblk_gc *gc = &pblk->gc;

    struct pblk_gc_rq *gc_rq, *tgc_rq;

    LIST_HEAD(w_list);

​

    spin_lock(&gc->w_lock);

    if (list_empty(&gc->w_list)) {

        spin_unlock(&gc->w_lock);

        return 1;

    }

​

    list_cut_position(&w_list, &gc->w_list, gc->w_list.prev);

    gc->w_entries = 0;

    spin_unlock(&gc->w_lock);

​

    list_for_each_entry_safe(gc_rq, tgc_rq, &w_list, list) {

        pblk_write_gc_to_cache(pblk, gc_rq);

        list_del(&gc_rq->list);

        kref_put(&gc_rq->line->ref, pblk_line_put);

        pblk_gc_free_gc_rq(gc_rq);

    }

​

    return 0;

}

​

static void pblk_gc_writer_kick(struct pblk_gc *gc)

{

    wake_up_process(gc->gc_writer_ts);

}

​

static void pblk_put_line_back(struct pblk *pblk, struct pblk_line *line)

{