linux/block/blk-crypto-sysfs.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright 2021 Google LLC
 *
 * sysfs support for blk-crypto.  This file contains the code which exports the
 * crypto capabilities of devices via /sys/block/$disk/queue/crypto/.
 */

#include <linux/blk-crypto-profile.h>

#include "blk-crypto-internal.h"

struct blk_crypto_kobj { … };

struct blk_crypto_attr { … };

static struct blk_crypto_profile *kobj_to_crypto_profile(struct kobject *kobj)
{ … }

static struct blk_crypto_attr *attr_to_crypto_attr(struct attribute *attr)
{ … }

static ssize_t max_dun_bits_show(struct blk_crypto_profile *profile,
				 struct blk_crypto_attr *attr, char *page)
{ … }

static ssize_t num_keyslots_show(struct blk_crypto_profile *profile,
				 struct blk_crypto_attr *attr, char *page)
{ … }

#define BLK_CRYPTO_RO_ATTR(_name) …

BLK_CRYPTO_RO_ATTR(…);
BLK_CRYPTO_RO_ATTR(…);

static struct attribute *blk_crypto_attrs[] = …;

static const struct attribute_group blk_crypto_attr_group = …;

/*
 * The encryption mode attributes.  To avoid hard-coding the list of encryption
 * modes, these are initialized at boot time by blk_crypto_sysfs_init().
 */
static struct blk_crypto_attr __blk_crypto_mode_attrs[BLK_ENCRYPTION_MODE_MAX];
static struct attribute *blk_crypto_mode_attrs[BLK_ENCRYPTION_MODE_MAX + 1];

static umode_t blk_crypto_mode_is_visible(struct kobject *kobj,
					  struct attribute *attr, int n)
{ … }

static ssize_t blk_crypto_mode_show(struct blk_crypto_profile *profile,
				    struct blk_crypto_attr *attr, char *page)
{ … }

static const struct attribute_group blk_crypto_modes_attr_group = …;

static const struct attribute_group *blk_crypto_attr_groups[] = …;

static ssize_t blk_crypto_attr_show(struct kobject *kobj,
				    struct attribute *attr, char *page)
{ … }

static const struct sysfs_ops blk_crypto_attr_ops = …;

static void blk_crypto_release(struct kobject *kobj)
{ … }

static const struct kobj_type blk_crypto_ktype = …;

/*
 * If the request_queue has a blk_crypto_profile, create the "crypto"
 * subdirectory in sysfs (/sys/block/$disk/queue/crypto/).
 */
int blk_crypto_sysfs_register(struct gendisk *disk)
{ … }

void blk_crypto_sysfs_unregister(struct gendisk *disk)
{ … }

static int __init blk_crypto_sysfs_init(void)
{ … }
subsys_initcall(blk_crypto_sysfs_init);