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// SPDX-License-Identifier: GPL-2.0-only
/*
* This file is part of UBIFS.
*
* Copyright (C) 2021 Cisco Systems
*
* Author: Stefan Schaeckeler
*/
#include <linux/fs.h>
#include "ubifs.h"
enum attr_id_t {
attr_errors_magic,
attr_errors_node,
attr_errors_crc,
};
struct ubifs_attr {
struct attribute attr;
enum attr_id_t attr_id;
};
#define UBIFS_ATTR(_name, _mode, _id) \
static struct ubifs_attr ubifs_attr_##_name = { \
.attr = {.name = __stringify(_name), .mode = _mode }, \
.attr_id = attr_##_id, \
}
#define UBIFS_ATTR_FUNC(_name, _mode) UBIFS_ATTR(_name, _mode, _name)
UBIFS_ATTR_FUNC(errors_magic, 0444);
UBIFS_ATTR_FUNC(errors_crc, 0444);
UBIFS_ATTR_FUNC(errors_node, 0444);
#define ATTR_LIST(name) (&ubifs_attr_##name.attr)
static struct attribute *ubifs_attrs[] = {
ATTR_LIST(errors_magic),
ATTR_LIST(errors_node),
ATTR_LIST(errors_crc),
NULL,
};
ATTRIBUTE_GROUPS(ubifs);
static ssize_t ubifs_attr_show(struct kobject *kobj,
struct attribute *attr, char *buf)
{
struct ubifs_info *sbi = container_of(kobj, struct ubifs_info,
kobj);
struct ubifs_attr *a = container_of(attr, struct ubifs_attr, attr);
switch (a->attr_id) {
case attr_errors_magic:
return sysfs_emit(buf, "%u\n", sbi->stats->magic_errors);
case attr_errors_node:
return sysfs_emit(buf, "%u\n", sbi->stats->node_errors);
case attr_errors_crc:
return sysfs_emit(buf, "%u\n", sbi->stats->crc_errors);
}
return 0;
};
static void ubifs_sb_release(struct kobject *kobj)
{
struct ubifs_info *c = container_of(kobj, struct ubifs_info, kobj);
complete(&c->kobj_unregister);
}
static const struct sysfs_ops ubifs_attr_ops = {
.show = ubifs_attr_show,
};
static const struct kobj_type ubifs_sb_ktype = {
.default_groups = ubifs_groups,
.sysfs_ops = &ubifs_attr_ops,
.release = ubifs_sb_release,
};
static const struct kobj_type ubifs_ktype = {
.sysfs_ops = &ubifs_attr_ops,
};
static struct kset ubifs_kset = {
.kobj = {.ktype = &ubifs_ktype},
};
int ubifs_sysfs_register(struct ubifs_info *c)
{
int ret, n;
char dfs_dir_name[UBIFS_DFS_DIR_LEN+1];
c->stats = kzalloc(sizeof(struct ubifs_stats_info), GFP_KERNEL);
if (!c->stats) {
ret = -ENOMEM;
goto out_last;
}
n = snprintf(dfs_dir_name, UBIFS_DFS_DIR_LEN + 1, UBIFS_DFS_DIR_NAME,
c->vi.ubi_num, c->vi.vol_id);
if (n > UBIFS_DFS_DIR_LEN) {
/* The array size is too small */
ret = -EINVAL;
goto out_free;
}
c->kobj.kset = &ubifs_kset;
init_completion(&c->kobj_unregister);
ret = kobject_init_and_add(&c->kobj, &ubifs_sb_ktype, NULL,
"%s", dfs_dir_name);
if (ret)
goto out_put;
return 0;
out_put:
kobject_put(&c->kobj);
wait_for_completion(&c->kobj_unregister);
out_free:
kfree(c->stats);
out_last:
ubifs_err(c, "cannot create sysfs entry for ubifs%d_%d, error %d\n",
c->vi.ubi_num, c->vi.vol_id, ret);
return ret;
}
void ubifs_sysfs_unregister(struct ubifs_info *c)
{
kobject_del(&c->kobj);
kobject_put(&c->kobj);
wait_for_completion(&c->kobj_unregister);
kfree(c->stats);
}
int __init ubifs_sysfs_init(void)
{
int ret;
kobject_set_name(&ubifs_kset.kobj, "ubifs");
ubifs_kset.kobj.parent = fs_kobj;
ret = kset_register(&ubifs_kset);
if (ret)
kset_put(&ubifs_kset);
return ret;
}
void ubifs_sysfs_exit(void)
{
kset_unregister(&ubifs_kset);
}
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