// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright 2021 Google LLC
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*/
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#include <linux/fs.h>
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#include <linux/kobject.h>
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#include <uapi/linux/incrementalfs.h>
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#include "sysfs.h"
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#include "data_mgmt.h"
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#include "vfs.h"
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/******************************************************************************
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* Define sys/fs/incrementalfs & sys/fs/incrementalfs/features
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*****************************************************************************/
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#define INCFS_NODE_FEATURES "features"
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#define INCFS_NODE_INSTANCES "instances"
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static struct kobject *sysfs_root;
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static struct kobject *features_node;
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static struct kobject *instances_node;
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#define DECLARE_FEATURE_FLAG(name) \
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static ssize_t name##_show(struct kobject *kobj, \
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struct kobj_attribute *attr, char *buff) \
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{ \
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return sysfs_emit(buff, "supported\n"); \
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} \
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\
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static struct kobj_attribute name##_attr = __ATTR_RO(name)
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DECLARE_FEATURE_FLAG(corefs);
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DECLARE_FEATURE_FLAG(zstd);
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DECLARE_FEATURE_FLAG(v2);
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static struct attribute *attributes[] = {
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&corefs_attr.attr,
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&zstd_attr.attr,
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&v2_attr.attr,
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NULL,
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};
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static const struct attribute_group attr_group = {
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.attrs = attributes,
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};
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int __init incfs_init_sysfs(void)
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{
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int res = -ENOMEM;
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sysfs_root = kobject_create_and_add(INCFS_NAME, fs_kobj);
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if (!sysfs_root)
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return -ENOMEM;
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instances_node = kobject_create_and_add(INCFS_NODE_INSTANCES,
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sysfs_root);
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if (!instances_node)
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goto err_put_root;
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features_node = kobject_create_and_add(INCFS_NODE_FEATURES,
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sysfs_root);
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if (!features_node)
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goto err_put_instances;
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res = sysfs_create_group(features_node, &attr_group);
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if (res)
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goto err_put_features;
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return 0;
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err_put_features:
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kobject_put(features_node);
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err_put_instances:
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kobject_put(instances_node);
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err_put_root:
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kobject_put(sysfs_root);
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return res;
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}
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void incfs_cleanup_sysfs(void)
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{
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if (features_node) {
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sysfs_remove_group(features_node, &attr_group);
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kobject_put(features_node);
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}
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kobject_put(instances_node);
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kobject_put(sysfs_root);
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}
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/******************************************************************************
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* Define sys/fs/incrementalfs/instances/<name>/
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*****************************************************************************/
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#define __DECLARE_STATUS_FLAG(name) \
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static ssize_t name##_show(struct kobject *kobj, \
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struct kobj_attribute *attr, char *buff) \
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{ \
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struct incfs_sysfs_node *node = container_of(kobj, \
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struct incfs_sysfs_node, isn_sysfs_node); \
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\
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return sysfs_emit(buff, "%d\n", node->isn_mi->mi_##name); \
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} \
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\
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static struct kobj_attribute name##_attr = __ATTR_RO(name)
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#define __DECLARE_STATUS_FLAG64(name) \
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static ssize_t name##_show(struct kobject *kobj, \
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struct kobj_attribute *attr, char *buff) \
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{ \
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struct incfs_sysfs_node *node = container_of(kobj, \
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struct incfs_sysfs_node, isn_sysfs_node); \
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\
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return sysfs_emit(buff, "%lld\n", node->isn_mi->mi_##name); \
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} \
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\
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static struct kobj_attribute name##_attr = __ATTR_RO(name)
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__DECLARE_STATUS_FLAG(reads_failed_timed_out);
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__DECLARE_STATUS_FLAG(reads_failed_hash_verification);
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__DECLARE_STATUS_FLAG(reads_failed_other);
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__DECLARE_STATUS_FLAG(reads_delayed_pending);
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__DECLARE_STATUS_FLAG64(reads_delayed_pending_us);
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__DECLARE_STATUS_FLAG(reads_delayed_min);
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__DECLARE_STATUS_FLAG64(reads_delayed_min_us);
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static struct attribute *mount_attributes[] = {
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&reads_failed_timed_out_attr.attr,
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&reads_failed_hash_verification_attr.attr,
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&reads_failed_other_attr.attr,
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&reads_delayed_pending_attr.attr,
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&reads_delayed_pending_us_attr.attr,
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&reads_delayed_min_attr.attr,
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&reads_delayed_min_us_attr.attr,
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NULL,
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};
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static void incfs_sysfs_release(struct kobject *kobj)
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{
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struct incfs_sysfs_node *node = container_of(kobj,
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struct incfs_sysfs_node, isn_sysfs_node);
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complete(&node->isn_completion);
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}
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static const struct attribute_group mount_attr_group = {
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.attrs = mount_attributes,
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};
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static struct kobj_type incfs_kobj_node_ktype = {
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.sysfs_ops = &kobj_sysfs_ops,
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.release = &incfs_sysfs_release,
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};
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struct incfs_sysfs_node *incfs_add_sysfs_node(const char *name,
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struct mount_info *mi)
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{
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struct incfs_sysfs_node *node = NULL;
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int error;
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if (!name)
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return NULL;
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node = kzalloc(sizeof(*node), GFP_NOFS);
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if (!node)
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return ERR_PTR(-ENOMEM);
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node->isn_mi = mi;
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init_completion(&node->isn_completion);
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kobject_init(&node->isn_sysfs_node, &incfs_kobj_node_ktype);
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error = kobject_add(&node->isn_sysfs_node, instances_node, "%s", name);
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if (error)
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goto err;
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error = sysfs_create_group(&node->isn_sysfs_node, &mount_attr_group);
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if (error)
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goto err;
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return node;
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err:
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/*
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* Note kobject_put always calls release, so incfs_sysfs_release will
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* free node
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*/
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kobject_put(&node->isn_sysfs_node);
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return ERR_PTR(error);
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}
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void incfs_free_sysfs_node(struct incfs_sysfs_node *node)
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{
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if (!node)
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return;
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sysfs_remove_group(&node->isn_sysfs_node, &mount_attr_group);
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kobject_put(&node->isn_sysfs_node);
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wait_for_completion_interruptible(&node->isn_completion);
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kfree(node);
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}
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