Extract the FUSE implementation from the main sdcard.c file. (c255f25c) · Commits · e / os / android_system_core

sdcard/Android.mk

+1 −1

Original line number	Diff line number	Diff line
		@@ -2,7 +2,7 @@ LOCAL_PATH := $(call my-dir)

		include $(CLEAR_VARS)

		LOCAL_SRC_FILES := sdcard.c
		LOCAL_SRC_FILES := sdcard.cpp fuse.c
		LOCAL_MODULE := sdcard
		LOCAL_CFLAGS := -Wall -Wno-unused-parameter -Werror
		LOCAL_SHARED_LIBRARIES := liblog libcutils libpackagelistparser

sdcard/sdcard.c→sdcard/fuse.c

+3 −563

Original line number	Diff line number	Diff line
		@@ -16,238 +16,14 @@

		#define LOG_TAG "sdcard"

		#include <ctype.h>
		#include <dirent.h>
		#include <errno.h>
		#include <fcntl.h>
		#include <inttypes.h>
		#include <limits.h>
		#include <linux/fuse.h>
		#include <pthread.h>
		#include <stdbool.h>
		#include <stdio.h>
		#include <stdlib.h>
		#include <string.h>
		#include <sys/inotify.h>
		#include <sys/mount.h>
		#include <sys/param.h>
		#include <sys/resource.h>
		#include <sys/stat.h>
		#include <sys/statfs.h>
		#include <sys/time.h>
		#include <sys/types.h>
		#include <sys/uio.h>
		#include <unistd.h>

		#include <cutils/fs.h>
		#include <cutils/hashmap.h>
		#include <cutils/log.h>
		#include <cutils/multiuser.h>
		#include <packagelistparser/packagelistparser.h>

		#include <private/android_filesystem_config.h>

		/* README
		*
		* What is this?
		*
		* sdcard is a program that uses FUSE to emulate FAT-on-sdcard style
		* directory permissions (all files are given fixed owner, group, and
		* permissions at creation, owner, group, and permissions are not
		* changeable, symlinks and hardlinks are not createable, etc.
		*
		* See usage() for command line options.
		*
		* It must be run as root, but will drop to requested UID/GID as soon as it
		* mounts a filesystem. It will refuse to run if requested UID/GID are zero.
		*
		* Things I believe to be true:
		*
		* - ops that return a fuse_entry (LOOKUP, MKNOD, MKDIR, LINK, SYMLINK,
		* CREAT) must bump that node's refcount
		* - don't forget that FORGET can forget multiple references (req->nlookup)
		* - if an op that returns a fuse_entry fails writing the reply to the
		* kernel, you must rollback the refcount to reflect the reference the
		* kernel did not actually acquire
		*
		* This daemon can also derive custom filesystem permissions based on directory
		* structure when requested. These custom permissions support several features:
		*
		* - Apps can access their own files in /Android/data/com.example/ without
		* requiring any additional GIDs.
		* - Separate permissions for protecting directories like Pictures and Music.
		* - Multi-user separation on the same physical device.
		*/

		#define FUSE_TRACE 0

		#if FUSE_TRACE
		#define TRACE(x...) ALOGD(x)
		#else
		#define TRACE(x...) do {} while (0)
		#endif

		#define ERROR(x...) ALOGE(x)
		#include "fuse.h"

		#define FUSE_UNKNOWN_INO 0xffffffff

		/* Maximum number of bytes to write in one request. */
		#define MAX_WRITE (256 * 1024)

		/* Maximum number of bytes to read in one request. */
		#define MAX_READ (128 * 1024)

		/* Largest possible request.
		* The request size is bounded by the maximum size of a FUSE_WRITE request because it has
		* the largest possible data payload. */
		#define MAX_REQUEST_SIZE (sizeof(struct fuse_in_header) + sizeof(struct fuse_write_in) + MAX_WRITE)

		/* Pseudo-error constant used to indicate that no fuse status is needed
		* or that a reply has already been written. */
		#define NO_STATUS 1

		/* Supplementary groups to execute with */
		static const gid_t kGroups[1] = { AID_PACKAGE_INFO };

		/* Permission mode for a specific node. Controls how file permissions
		* are derived for children nodes. */
		typedef enum {
		/* Nothing special; this node should just inherit from its parent. */
		PERM_INHERIT,
		/* This node is one level above a normal root; used for legacy layouts
		* which use the first level to represent user_id. */
		PERM_PRE_ROOT,
		/* This node is "/" */
		PERM_ROOT,
		/* This node is "/Android" */
		PERM_ANDROID,
		/* This node is "/Android/data" */
		PERM_ANDROID_DATA,
		/* This node is "/Android/obb" */
		PERM_ANDROID_OBB,
		/* This node is "/Android/media" */
		PERM_ANDROID_MEDIA,
		} perm_t;

		struct handle {
		int fd;
		};

		struct dirhandle {
		DIR *d;
		};

		struct node {
		__u32 refcount;
		__u64 nid;
		__u64 gen;
		/*
		* The inode number for this FUSE node. Note that this isn't stable across
		* multiple invocations of the FUSE daemon.
		*/
		__u32 ino;

		/* State derived based on current position in hierarchy. */
		perm_t perm;
		userid_t userid;
		uid_t uid;
		bool under_android;

		struct node next; / per-dir sibling list */
		struct node child; / first contained file by this dir */
		struct node parent; / containing directory */

		size_t namelen;
		char *name;
		/* If non-null, this is the real name of the file in the underlying storage.
		* This may differ from the field "name" only by case.
		* strlen(actual_name) will always equal strlen(name), so it is safe to use
		* namelen for both fields.
		*/
		char *actual_name;

		/* If non-null, an exact underlying path that should be grafted into this
		* position. Used to support things like OBB. */
		char* graft_path;
		size_t graft_pathlen;

		bool deleted;
		};

		static int str_hash(void *key) {
		return hashmapHash(key, strlen(key));
		}

		/** Test if two string keys are equal ignoring case */
		static bool str_icase_equals(void keyA, void keyB) {
		return strcasecmp(keyA, keyB) == 0;
		}

		/* Global data for all FUSE mounts */
		struct fuse_global {
		pthread_mutex_t lock;

		uid_t uid;
		gid_t gid;
		bool multi_user;

		char source_path[PATH_MAX];
		char obb_path[PATH_MAX];

		Hashmap* package_to_appid;

		__u64 next_generation;
		struct node root;

		/* Used to allocate unique inode numbers for fuse nodes. We use
		* a simple counter based scheme where inode numbers from deleted
		* nodes aren't reused. Note that inode allocations are not stable
		* across multiple invocation of the sdcard daemon, but that shouldn't
		* be a huge problem in practice.
		*
		* Note that we restrict inodes to 32 bit unsigned integers to prevent
		* truncation on 32 bit processes when unsigned long long stat.st_ino is
		* assigned to an unsigned long ino_t type in an LP32 process.
		*
		* Also note that fuse_attr and fuse_dirent inode values are 64 bits wide
		* on both LP32 and LP64, but the fuse kernel code doesn't squash 64 bit
		* inode numbers into 32 bit values on 64 bit kernels (see fuse_squash_ino
		* in fs/fuse/inode.c).
		*
		* Accesses must be guarded by \|lock\|.
		*/
		__u32 inode_ctr;

		struct fuse* fuse_default;
		struct fuse* fuse_read;
		struct fuse* fuse_write;
		};

		/* Single FUSE mount */
		struct fuse {
		struct fuse_global* global;

		char dest_path[PATH_MAX];

		int fd;

		gid_t gid;
		mode_t mask;
		};

		/* Private data used by a single FUSE handler */
		struct fuse_handler {
		struct fuse* fuse;
		int token;

		/* To save memory, we never use the contents of the request buffer and the read
		* buffer at the same time. This allows us to share the underlying storage. */
		union {
		__u8 request_buffer[MAX_REQUEST_SIZE];
		__u8 read_buffer[MAX_READ + PAGE_SIZE];
		};
		};

		static inline void *id_to_ptr(__u64 nid)
		{
		return (void *) (uintptr_t) nid;
		@@ -507,7 +283,7 @@ static void derive_permissions_locked(struct fuse* fuse, struct node *parent,
		}
		}

		static void derive_permissions_recursive_locked(struct fuse* fuse, struct node *parent) {
		void derive_permissions_recursive_locked(struct fuse* fuse, struct node *parent) {
		struct node *node;
		for (node = parent->child; node; node = node->next) {
		derive_permissions_locked(fuse, parent, node);
		@@ -1608,7 +1384,7 @@ static int handle_fuse_request(struct fuse fuse, struct fuse_handler handler,
		}
		}

		static void handle_fuse_requests(struct fuse_handler* handler)
		void handle_fuse_requests(struct fuse_handler* handler)
		{
		struct fuse* fuse = handler->fuse;
		for (;;) {
		@@ -1651,339 +1427,3 @@ static void handle_fuse_requests(struct fuse_handler* handler)
		}
		}
		}

		static void* start_handler(void* data)
		{
		struct fuse_handler* handler = data;
		handle_fuse_requests(handler);
		return NULL;
		}

		static bool remove_str_to_int(void key, void value, void *context) {
		Hashmap* map = context;
		hashmapRemove(map, key);
		free(key);
		return true;
		}

		static bool package_parse_callback(pkg_info info, void userdata) {
		struct fuse_global global = (struct fuse_global )userdata;

		char* name = strdup(info->name);
		hashmapPut(global->package_to_appid, name, (void*) (uintptr_t) info->uid);
		packagelist_free(info);
		return true;
		}

		static bool read_package_list(struct fuse_global* global) {
		pthread_mutex_lock(&global->lock);

		hashmapForEach(global->package_to_appid, remove_str_to_int, global->package_to_appid);

		bool rc = packagelist_parse(package_parse_callback, global);
		TRACE("read_package_list: found %zu packages\n",
		hashmapSize(global->package_to_appid));

		/* Regenerate ownership details using newly loaded mapping */
		derive_permissions_recursive_locked(global->fuse_default, &global->root);

		pthread_mutex_unlock(&global->lock);

		return rc;
		}

		static void watch_package_list(struct fuse_global* global) {
		struct inotify_event *event;
		char event_buf[512];

		int nfd = inotify_init();
		if (nfd < 0) {
		ERROR("inotify_init failed: %s\n", strerror(errno));
		return;
		}

		bool active = false;
		while (1) {
		if (!active) {
		int res = inotify_add_watch(nfd, PACKAGES_LIST_FILE, IN_DELETE_SELF);
		if (res == -1) {
		if (errno == ENOENT \|\| errno == EACCES) {
		/* Framework may not have created yet, sleep and retry */
		ERROR("missing \"%s\"; retrying\n", PACKAGES_LIST_FILE);
		sleep(3);
		continue;
		} else {
		ERROR("inotify_add_watch failed: %s\n", strerror(errno));
		return;
		}
		}

		/* Watch above will tell us about any future changes, so
		* read the current state. */
		if (read_package_list(global) == false) {
		ERROR("read_package_list failed\n");
		return;
		}
		active = true;
		}

		int event_pos = 0;
		int res = read(nfd, event_buf, sizeof(event_buf));
		if (res < (int) sizeof(*event)) {
		if (errno == EINTR)
		continue;
		ERROR("failed to read inotify event: %s\n", strerror(errno));
		return;
		}

		while (res >= (int) sizeof(*event)) {
		int event_size;
		event = (struct inotify_event *) (event_buf + event_pos);

		TRACE("inotify event: %08x\n", event->mask);
		if ((event->mask & IN_IGNORED) == IN_IGNORED) {
		/* Previously watched file was deleted, probably due to move
		* that swapped in new data; re-arm the watch and read. */
		active = false;
		}

		event_size = sizeof(*event) + event->len;
		res -= event_size;
		event_pos += event_size;
		}
		}
		}

		static int usage() {
		ERROR("usage: sdcard [OPTIONS] <source_path> <label>\n"
		" -u: specify UID to run as\n"
		" -g: specify GID to run as\n"
		" -U: specify user ID that owns device\n"
		" -m: source_path is multi-user\n"
		" -w: runtime write mount has full write access\n"
		"\n");
		return 1;
		}

		static int fuse_setup(struct fuse* fuse, gid_t gid, mode_t mask) {
		char opts[256];

		fuse->fd = open("/dev/fuse", O_RDWR);
		if (fuse->fd == -1) {
		ERROR("failed to open fuse device: %s\n", strerror(errno));
		return -1;
		}

		umount2(fuse->dest_path, MNT_DETACH);

		snprintf(opts, sizeof(opts),
		"fd=%i,rootmode=40000,default_permissions,allow_other,user_id=%d,group_id=%d",
		fuse->fd, fuse->global->uid, fuse->global->gid);
		if (mount("/dev/fuse", fuse->dest_path, "fuse", MS_NOSUID \| MS_NODEV \| MS_NOEXEC \|
		MS_NOATIME, opts) != 0) {
		ERROR("failed to mount fuse filesystem: %s\n", strerror(errno));
		return -1;
		}

		fuse->gid = gid;
		fuse->mask = mask;

		return 0;
		}

		static void run(const char* source_path, const char* label, uid_t uid,
		gid_t gid, userid_t userid, bool multi_user, bool full_write) {
		struct fuse_global global;
		struct fuse fuse_default;
		struct fuse fuse_read;
		struct fuse fuse_write;
		struct fuse_handler handler_default;
		struct fuse_handler handler_read;
		struct fuse_handler handler_write;
		pthread_t thread_default;
		pthread_t thread_read;
		pthread_t thread_write;

		memset(&global, 0, sizeof(global));
		memset(&fuse_default, 0, sizeof(fuse_default));
		memset(&fuse_read, 0, sizeof(fuse_read));
		memset(&fuse_write, 0, sizeof(fuse_write));
		memset(&handler_default, 0, sizeof(handler_default));
		memset(&handler_read, 0, sizeof(handler_read));
		memset(&handler_write, 0, sizeof(handler_write));

		pthread_mutex_init(&global.lock, NULL);
		global.package_to_appid = hashmapCreate(256, str_hash, str_icase_equals);
		global.uid = uid;
		global.gid = gid;
		global.multi_user = multi_user;
		global.next_generation = 0;
		global.inode_ctr = 1;

		memset(&global.root, 0, sizeof(global.root));
		global.root.nid = FUSE_ROOT_ID; /* 1 */
		global.root.refcount = 2;
		global.root.namelen = strlen(source_path);
		global.root.name = strdup(source_path);
		global.root.userid = userid;
		global.root.uid = AID_ROOT;
		global.root.under_android = false;

		strcpy(global.source_path, source_path);

		if (multi_user) {
		global.root.perm = PERM_PRE_ROOT;
		snprintf(global.obb_path, sizeof(global.obb_path), "%s/obb", source_path);
		} else {
		global.root.perm = PERM_ROOT;
		snprintf(global.obb_path, sizeof(global.obb_path), "%s/Android/obb", source_path);
		}

		fuse_default.global = &global;
		fuse_read.global = &global;
		fuse_write.global = &global;

		global.fuse_default = &fuse_default;
		global.fuse_read = &fuse_read;
		global.fuse_write = &fuse_write;

		snprintf(fuse_default.dest_path, PATH_MAX, "/mnt/runtime/default/%s", label);
		snprintf(fuse_read.dest_path, PATH_MAX, "/mnt/runtime/read/%s", label);
		snprintf(fuse_write.dest_path, PATH_MAX, "/mnt/runtime/write/%s", label);

		handler_default.fuse = &fuse_default;
		handler_read.fuse = &fuse_read;
		handler_write.fuse = &fuse_write;

		handler_default.token = 0;
		handler_read.token = 1;
		handler_write.token = 2;

		umask(0);

		if (multi_user) {
		/* Multi-user storage is fully isolated per user, so "other"
		* permissions are completely masked off. */
		if (fuse_setup(&fuse_default, AID_SDCARD_RW, 0006)
		\|\| fuse_setup(&fuse_read, AID_EVERYBODY, 0027)
		\|\| fuse_setup(&fuse_write, AID_EVERYBODY, full_write ? 0007 : 0027)) {
		ERROR("failed to fuse_setup\n");
		exit(1);
		}
		} else {
		/* Physical storage is readable by all users on device, but
		* the Android directories are masked off to a single user
		* deep inside attr_from_stat(). */
		if (fuse_setup(&fuse_default, AID_SDCARD_RW, 0006)
		\|\| fuse_setup(&fuse_read, AID_EVERYBODY, full_write ? 0027 : 0022)
		\|\| fuse_setup(&fuse_write, AID_EVERYBODY, full_write ? 0007 : 0022)) {
		ERROR("failed to fuse_setup\n");
		exit(1);
		}
		}

		/* Drop privs */
		if (setgroups(sizeof(kGroups) / sizeof(kGroups[0]), kGroups) < 0) {
		ERROR("cannot setgroups: %s\n", strerror(errno));
		exit(1);
		}
		if (setgid(gid) < 0) {
		ERROR("cannot setgid: %s\n", strerror(errno));
		exit(1);
		}
		if (setuid(uid) < 0) {
		ERROR("cannot setuid: %s\n", strerror(errno));
		exit(1);
		}

		if (multi_user) {
		fs_prepare_dir(global.obb_path, 0775, uid, gid);
		}

		if (pthread_create(&thread_default, NULL, start_handler, &handler_default)
		\|\| pthread_create(&thread_read, NULL, start_handler, &handler_read)
		\|\| pthread_create(&thread_write, NULL, start_handler, &handler_write)) {
		ERROR("failed to pthread_create\n");
		exit(1);
		}

		watch_package_list(&global);
		ERROR("terminated prematurely\n");
		exit(1);
		}

		int main(int argc, char **argv) {
		const char *source_path = NULL;
		const char *label = NULL;
		uid_t uid = 0;
		gid_t gid = 0;
		userid_t userid = 0;
		bool multi_user = false;
		bool full_write = false;
		int i;
		struct rlimit rlim;
		int fs_version;

		int opt;
		while ((opt = getopt(argc, argv, "u:g:U:mw")) != -1) {
		switch (opt) {
		case 'u':
		uid = strtoul(optarg, NULL, 10);
		break;
		case 'g':
		gid = strtoul(optarg, NULL, 10);
		break;
		case 'U':
		userid = strtoul(optarg, NULL, 10);
		break;
		case 'm':
		multi_user = true;
		break;
		case 'w':
		full_write = true;
		break;
		case '?':
		default:
		return usage();
		}
		}

		for (i = optind; i < argc; i++) {
		char* arg = argv[i];
		if (!source_path) {
		source_path = arg;
		} else if (!label) {
		label = arg;
		} else {
		ERROR("too many arguments\n");
		return usage();
		}
		}

		if (!source_path) {
		ERROR("no source path specified\n");
		return usage();
		}
		if (!label) {
		ERROR("no label specified\n");
		return usage();
		}
		if (!uid \|\| !gid) {
		ERROR("uid and gid must be nonzero\n");
		return usage();
		}

		rlim.rlim_cur = 8192;
		rlim.rlim_max = 8192;
		if (setrlimit(RLIMIT_NOFILE, &rlim)) {
		ERROR("Error setting RLIMIT_NOFILE, errno = %d\n", errno);
		}

		while ((fs_read_atomic_int("/data/.layout_version", &fs_version) == -1) \|\| (fs_version < 3)) {
		ERROR("installd fs upgrade not yet complete. Waiting...\n");
		sleep(1);
		}

		run(source_path, label, uid, gid, userid, multi_user, full_write);
		return 1;
		}

sdcard/fuse.h

0 → 100644

+203 −0

Original line number	Diff line number	Diff line
		/*
		* Copyright (C) 2016 The Android Open Source Project
		*
		* Licensed under the Apache License, Version 2.0 (the "License");
		* you may not use this file except in compliance with the License.
		* You may obtain a copy of the License at
		*
		* http://www.apache.org/licenses/LICENSE-2.0
		*
		* Unless required by applicable law or agreed to in writing, software
		* distributed under the License is distributed on an "AS IS" BASIS,
		* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
		* See the License for the specific language governing permissions and
		* limitations under the License.
		*/

		#ifndef FUSE_H_
		#define FUSE_H_

		#include <dirent.h>
		#include <fcntl.h>
		#include <linux/fuse.h>
		#include <pthread.h>
		#include <stdbool.h>
		#include <stdlib.h>
		#include <sys/param.h>
		#include <sys/stat.h>
		#include <sys/statfs.h>
		#include <sys/types.h>
		#include <sys/uio.h>
		#include <unistd.h>

		#include <cutils/fs.h>
		#include <cutils/hashmap.h>
		#include <cutils/log.h>
		#include <cutils/multiuser.h>
		#include <packagelistparser/packagelistparser.h>

		#include <private/android_filesystem_config.h>

		#ifdef __cplusplus
		extern "C" {
		#endif

		#define FUSE_TRACE 0

		#if FUSE_TRACE
		#define TRACE(x...) ALOGD(x)
		#else
		#define TRACE(x...) do {} while (0)
		#endif

		#define ERROR(x...) ALOGE(x)

		/* Maximum number of bytes to write in one request. */
		#define MAX_WRITE (256 * 1024)

		/* Maximum number of bytes to read in one request. */
		#define MAX_READ (128 * 1024)

		/* Largest possible request.
		* The request size is bounded by the maximum size of a FUSE_WRITE request because it has
		* the largest possible data payload. */
		#define MAX_REQUEST_SIZE (sizeof(struct fuse_in_header) + sizeof(struct fuse_write_in) + MAX_WRITE)

		/* Permission mode for a specific node. Controls how file permissions
		* are derived for children nodes. */
		typedef enum {
		/* Nothing special; this node should just inherit from its parent. */
		PERM_INHERIT,
		/* This node is one level above a normal root; used for legacy layouts
		* which use the first level to represent user_id. */
		PERM_PRE_ROOT,
		/* This node is "/" */
		PERM_ROOT,
		/* This node is "/Android" */
		PERM_ANDROID,
		/* This node is "/Android/data" */
		PERM_ANDROID_DATA,
		/* This node is "/Android/obb" */
		PERM_ANDROID_OBB,
		/* This node is "/Android/media" */
		PERM_ANDROID_MEDIA,
		} perm_t;

		struct handle {
		int fd;
		};

		struct dirhandle {
		DIR *d;
		};

		struct node {
		__u32 refcount;
		__u64 nid;
		__u64 gen;
		/*
		* The inode number for this FUSE node. Note that this isn't stable across
		* multiple invocations of the FUSE daemon.
		*/
		__u32 ino;

		/* State derived based on current position in hierarchy. */
		perm_t perm;
		userid_t userid;
		uid_t uid;
		bool under_android;

		struct node next; / per-dir sibling list */
		struct node child; / first contained file by this dir */
		struct node parent; / containing directory */

		size_t namelen;
		char *name;
		/* If non-null, this is the real name of the file in the underlying storage.
		* This may differ from the field "name" only by case.
		* strlen(actual_name) will always equal strlen(name), so it is safe to use
		* namelen for both fields.
		*/
		char *actual_name;

		/* If non-null, an exact underlying path that should be grafted into this
		* position. Used to support things like OBB. */
		char* graft_path;
		size_t graft_pathlen;

		bool deleted;
		};

		/* Global data for all FUSE mounts */
		struct fuse_global {
		pthread_mutex_t lock;

		uid_t uid;
		gid_t gid;
		bool multi_user;

		char source_path[PATH_MAX];
		char obb_path[PATH_MAX];

		Hashmap* package_to_appid;

		__u64 next_generation;
		struct node root;

		/* Used to allocate unique inode numbers for fuse nodes. We use
		* a simple counter based scheme where inode numbers from deleted
		* nodes aren't reused. Note that inode allocations are not stable
		* across multiple invocation of the sdcard daemon, but that shouldn't
		* be a huge problem in practice.
		*
		* Note that we restrict inodes to 32 bit unsigned integers to prevent
		* truncation on 32 bit processes when unsigned long long stat.st_ino is
		* assigned to an unsigned long ino_t type in an LP32 process.
		*
		* Also note that fuse_attr and fuse_dirent inode values are 64 bits wide
		* on both LP32 and LP64, but the fuse kernel code doesn't squash 64 bit
		* inode numbers into 32 bit values on 64 bit kernels (see fuse_squash_ino
		* in fs/fuse/inode.c).
		*
		* Accesses must be guarded by \|lock\|.
		*/
		__u32 inode_ctr;

		struct fuse* fuse_default;
		struct fuse* fuse_read;
		struct fuse* fuse_write;
		};

		/* Single FUSE mount */
		struct fuse {
		struct fuse_global* global;

		char dest_path[PATH_MAX];

		int fd;

		gid_t gid;
		mode_t mask;
		};

		/* Private data used by a single FUSE handler */
		struct fuse_handler {
		struct fuse* fuse;
		int token;

		/* To save memory, we never use the contents of the request buffer and the read
		* buffer at the same time. This allows us to share the underlying storage. */
		union {
		__u8 request_buffer[MAX_REQUEST_SIZE];
		__u8 read_buffer[MAX_READ + PAGE_SIZE];
		};
		};

		void handle_fuse_requests(struct fuse_handler* handler);
		void derive_permissions_recursive_locked(struct fuse* fuse, struct node *parent);

		#ifdef __cplusplus
		}; /* extern "C" */
		#endif

		#endif /* FUSE_H_ */

sdcard/sdcard.cpp

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