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