masklog.c

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/* -*- mode: c; c-basic-offset: 8; -*-
 * vim: noexpandtab sw=8 ts=8 sts=0:
 *
 * Copyright (C) 2004, 2005, 2012 Oracle.  All rights reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * 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.
 *
 * You should have received a copy of the GNU General Public
 * License along with this program; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 021110-1307, USA.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/string.h>
#include <linux/uaccess.h>

#include "masklog.h"

struct mlog_bits r2_mlog_and_bits = MLOG_BITS_RHS(MLOG_INITIAL_AND_MASK);
EXPORT_SYMBOL_GPL(r2_mlog_and_bits);
struct mlog_bits r2_mlog_not_bits = MLOG_BITS_RHS(0);
EXPORT_SYMBOL_GPL(r2_mlog_not_bits);

static ssize_t mlog_mask_show(u64 mask, char *buf)
{
    char *state;

    if (__mlog_test_u64(mask, r2_mlog_and_bits))
        state = "allow";
    else if (__mlog_test_u64(mask, r2_mlog_not_bits))
        state = "deny";
    else
        state = "off";

    return snprintf(buf, PAGE_SIZE, "%s\n", state);
}

static ssize_t mlog_mask_store(u64 mask, const char *buf, size_t count)
{
    if (!strnicmp(buf, "allow", 5)) {
        __mlog_set_u64(mask, r2_mlog_and_bits);
        __mlog_clear_u64(mask, r2_mlog_not_bits);
    } else if (!strnicmp(buf, "deny", 4)) {
        __mlog_set_u64(mask, r2_mlog_not_bits);
        __mlog_clear_u64(mask, r2_mlog_and_bits);
    } else if (!strnicmp(buf, "off", 3)) {
        __mlog_clear_u64(mask, r2_mlog_not_bits);
        __mlog_clear_u64(mask, r2_mlog_and_bits);
    } else
        return -EINVAL;

    return count;
}

struct mlog_attribute {
    struct attribute attr;
    u64 mask;
};

#define to_mlog_attr(_attr) container_of(_attr, struct mlog_attribute, attr)

#define define_mask(_name) {            \
    .attr = {               \
        .name = #_name,         \
        .mode = S_IRUGO | S_IWUSR,  \
    },                  \
    .mask = ML_##_name,         \
}

static struct mlog_attribute mlog_attrs[MLOG_MAX_BITS] = {
    define_mask(TCP),
    define_mask(MSG),
    define_mask(SOCKET),
    define_mask(HEARTBEAT),
    define_mask(HB_BIO),
    define_mask(DLMFS),
    define_mask(DLM),
    define_mask(DLM_DOMAIN),
    define_mask(DLM_THREAD),
    define_mask(DLM_MASTER),
    define_mask(DLM_RECOVERY),
    define_mask(DLM_GLUE),
    define_mask(VOTE),
    define_mask(CONN),
    define_mask(QUORUM),
    define_mask(BASTS),
    define_mask(CLUSTER),
    define_mask(ERROR),
    define_mask(NOTICE),
    define_mask(KTHREAD),
};

static struct attribute *mlog_attr_ptrs[MLOG_MAX_BITS] = {NULL, };

static ssize_t mlog_show(struct kobject *obj, struct attribute *attr,
             char *buf)
{
    struct mlog_attribute *mlog_attr = to_mlog_attr(attr);

    return mlog_mask_show(mlog_attr->mask, buf);
}

static ssize_t mlog_store(struct kobject *obj, struct attribute *attr,
              const char *buf, size_t count)
{
    struct mlog_attribute *mlog_attr = to_mlog_attr(attr);

    return mlog_mask_store(mlog_attr->mask, buf, count);
}

static const struct sysfs_ops mlog_attr_ops = {
    .show  = mlog_show,
    .store = mlog_store,
};

static struct kobj_type mlog_ktype = {
    .default_attrs = mlog_attr_ptrs,
    .sysfs_ops     = &mlog_attr_ops,
};

static struct kset mlog_kset = {
    .kobj   = {.ktype = &mlog_ktype},
};

int r2_mlog_sys_init(struct kset *r2cb_kset)
{
    int i = 0;

    while (mlog_attrs[i].attr.mode) {
        mlog_attr_ptrs[i] = &mlog_attrs[i].attr;
        i++;
    }
    mlog_attr_ptrs[i] = NULL;

    kobject_set_name(&mlog_kset.kobj, "logmask");
    mlog_kset.kobj.kset = r2cb_kset;
    return kset_register(&mlog_kset);
}

void r2_mlog_sys_shutdown(void)
{
    kset_unregister(&mlog_kset);
}