core_debugfs.c

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/* -*- C -*- */
/*
 * Copyright (c) 2013-2020 Seagate Technology LLC and/or its Affiliates
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * For any questions about this software or licensing,
 * please email opensource@seagate.com or cortx-questions@seagate.com.
 *
 */

#if 0

#include <linux/kernel.h>    /* pr_info */
#include <linux/debugfs.h>   /* debugfs_create_dir */
#include <linux/module.h>    /* THIS_MODULE */
#include <linux/version.h>

#include "lib/misc.h"        /* bool */
#include "motr/linux_kernel/module.h"
#include "utils/linux_kernel/m0ctl_internal.h"
#include "utils/linux_kernel/trace_debugfs.h"


static struct dentry  *core_file;
static const char      core_name[] = "core";
static bool            core_file_is_opened = false;


static int core_open(struct inode *i, struct file *f)
{
        if (core_file_is_opened)
                return -EBUSY;

        core_file_is_opened = true;

        return 0;
}

static int core_release(struct inode *i, struct file *f)
{
        core_file_is_opened = false;
        return 0;
}

static ssize_t core_read(struct file *file, char __user *ubuf,
                         size_t ubuf_size, loff_t *ppos)
{
        const struct module *m = m0_motr_ko_get_module();

        return simple_read_from_buffer(ubuf, ubuf_size, ppos,
                                       M0_MOTR_KO_BASE(m),
                                       M0_MOTR_KO_SIZE(m));
}

static const struct file_operations core_fops = {
        .owner    = THIS_MODULE,
        .open     = core_open,
        .release  = core_release,
        .read     = core_read,
};

/******************************* init/fini ************************************/

int core_dfs_init(void)
{
        core_file = debugfs_create_file(core_name, S_IRUSR, dfs_root_dir, NULL,
                                        &core_fops);
        if (core_file == NULL) {
                pr_err(KBUILD_MODNAME ": failed to create debugfs file"
                       " '%s/%s'\n", dfs_root_name, core_name);
                return -EPERM;
        }

        return 0;
}

void core_dfs_cleanup(void)
{
        debugfs_remove(core_file);
}

#endif

/*
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 */
/*
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