Merge changes from topic 'pre-early-mount' (1549257f) · Commits · e / os / android_system_core

fs_mgr/fs_mgr_slotselect.cpp

+57 −2

Original line number	Diff line number	Diff line
		@@ -25,6 +25,9 @@
		#include <stdlib.h>
		#include <string.h>

		#include <android-base/file.h>
		#include <android-base/stringprintf.h>
		#include <android-base/strings.h>
		#include <cutils/properties.h>

		#include "fs_mgr.h"
		@@ -77,8 +80,51 @@ static int get_active_slot_suffix_from_misc(struct fstab *fstab,
		return 0;
		}

		// Gets slot_suffix from either the kernel cmdline / firmware or the
		// misc partition. Sets \|out_suffix\| on success and returns 0. Returns
		// finds slot_suffix in androidboot.slot_suffix kernel command line argument
		// or in the device tree node at /firmware/android/slot_suffix property
		static int get_active_slot_suffix_from_kernel(char *out_suffix,
		size_t suffix_len)
		{
		std::string cmdline;
		if (android::base::ReadFileToString("/proc/cmdline", &cmdline)) {
		for (const auto& entry : android::base::Split(android::base::Trim(cmdline), " ")) {
		std::vector<std::string> pieces = android::base::Split(entry, "=");
		if (pieces.size() == 2) {
		if (pieces[0] == "androidboot.slot_suffix") {
		strncpy(out_suffix, pieces[1].c_str(), suffix_len);
		return 0;
		}
		}
		}
		}

		// if we can't find slot_suffix in cmdline, check the DT
		static constexpr char android_dt_dir[] = "/proc/device-tree/firmware/android";
		std::string file_name = android::base::StringPrintf("%s/compatible", android_dt_dir);
		std::string dt_value;
		if (android::base::ReadFileToString(file_name, &dt_value)) {
		if (!dt_value.compare("android,firmware")) {
		LERROR << "Error finding compatible android DT node";
		return -1;
		}

		file_name = android::base::StringPrintf("%s/%s", android_dt_dir, "slot_suffix");
		if (!android::base::ReadFileToString(file_name, &dt_value)) {
		LERROR << "Error finding slot_suffix in device tree";
		return -1;
		}

		// DT entries have a terminating '\0', so 'suffix_len' is safe.
		strncpy(out_suffix, dt_value.c_str(), suffix_len);
		return 0;
		}

		// slot_suffix missing in kernel cmdline or device tree
		return -1;
		}

		// Gets slot_suffix from either the kernel cmdline / device tree / firmware
		// or the misc partition. Sets \|out_suffix\| on success and returns 0. Returns
		// -1 if slot_suffix could not be determined.
		static int get_active_slot_suffix(struct fstab fstab, char out_suffix,
		size_t suffix_len)
		@@ -94,6 +140,15 @@ static int get_active_slot_suffix(struct fstab fstab, char out_suffix,
		return 0;
		}

		// if the property is not set, we are either being invoked too early
		// or the slot suffix in mentioned in the misc partition. If its
		// "too early", try to find the slotsuffix ourselves in the kernel command
		// line or the device tree
		if (get_active_slot_suffix_from_kernel(out_suffix, suffix_len) == 0) {
		LINFO << "Using slot suffix '" << out_suffix << "' from kernel";
		return 0;
		}

		// If we couldn't get the suffix from the kernel cmdline, try the
		// the misc partition.
		if (get_active_slot_suffix_from_misc(fstab, out_suffix, suffix_len) == 0) {

fs_mgr/include/fs_mgr.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -123,6 +123,7 @@ int fs_mgr_is_convertible_to_fbe(const struct fstab_rec *fstab);
		int fs_mgr_is_noemulatedsd(const struct fstab_rec *fstab);
		int fs_mgr_is_notrim(struct fstab_rec *fstab);
		int fs_mgr_is_formattable(struct fstab_rec *fstab);
		int fs_mgr_is_slotselect(struct fstab_rec *fstab);
		int fs_mgr_is_nofail(struct fstab_rec *fstab);
		int fs_mgr_is_latemount(struct fstab_rec *fstab);
		int fs_mgr_is_quota(struct fstab_rec *fstab);

init/devices.cpp

+96 −100

Original line number	Diff line number	Diff line
		@@ -62,19 +62,7 @@ static const char *firmware_dirs[] = { "/etc/firmware",

		extern struct selabel_handle *sehandle;

		static int device_fd = -1;

		struct uevent {
		const char *action;
		const char *path;
		const char *subsystem;
		const char *firmware;
		const char *partition_name;
		const char *device_name;
		int partition_num;
		int major;
		int minor;
		};
		static android::base::unique_fd device_fd;

		struct perms_ {
		char *name;
		@@ -249,11 +237,13 @@ static void make_device(const char *path,

		mode = get_device_perm(path, links, &uid, &gid) \| (block ? S_IFBLK : S_IFCHR);

		if (sehandle) {
		if (selabel_lookup_best_match(sehandle, &secontext, path, links, mode)) {
		PLOG(ERROR) << "Device '" << path << "' not created; cannot find SELinux label";
		return;
		}
		setfscreatecon(secontext);
		}

		dev = makedev(major, minor);
		/* Temporarily change egid to avoid race condition setting the gid of the
		@@ -264,7 +254,7 @@ static void make_device(const char *path,
		setegid(gid);
		/* If the node already exists update its SELinux label to handle cases when
		* it was created with the wrong context during coldboot procedure. */
		if (mknod(path, mode, dev) && (errno == EEXIST)) {
		if (mknod(path, mode, dev) && (errno == EEXIST) && secontext) {

		char* fcon = nullptr;
		int rc = lgetfilecon(path, &fcon);
		@@ -285,9 +275,11 @@ out:
		chown(path, uid, -1);
		setegid(AID_ROOT);

		if (secontext) {
		freecon(secontext);
		setfscreatecon(NULL);
		}
		}

		static void add_platform_device(const char *path)
		{
		@@ -349,6 +341,19 @@ static void remove_platform_device(const char *path)
		}
		}

		static void destroy_platform_devices() {
		struct listnode* node;
		struct listnode* n;
		struct platform_node* bus;

		list_for_each_safe(node, n, &platform_names) {
		list_remove(node);
		bus = node_to_item(node, struct platform_node, list);
		free(bus->path);
		free(bus);
		}
		}

		/* Given a path that may start with a PCI device, populate the supplied buffer
		* with the PCI domain/bus number and the peripheral ID and return 0.
		* If it doesn't start with a PCI device, or there is some error, return -1 */
		@@ -515,7 +520,7 @@ static char *get_block_device_symlinks(struct uevent uevent)
		return NULL;
		memset(links, 0, sizeof(char ) 4);

		LOG(INFO) << "found " << type << " device " << device;
		LOG(VERBOSE) << "found " << type << " device " << device;

		snprintf(link_path, sizeof(link_path), "/dev/block/%s/%s", type, device);

		@@ -875,9 +880,15 @@ static void handle_firmware_event(uevent* uevent) {
		}
		}

		static bool inline should_stop_coldboot(coldboot_action_t act)
		{
		return (act == COLDBOOT_STOP \|\| act == COLDBOOT_FINISH);
		}

		#define UEVENT_MSG_LEN 2048

		static inline void handle_device_fd_with(void (handle_uevent)(struct uevent*))
		static inline coldboot_action_t handle_device_fd_with(
		std::function<coldboot_action_t(uevent* uevent)> handle_uevent)
		{
		char msg[UEVENT_MSG_LEN+2];
		int n;
		@@ -890,14 +901,18 @@ static inline void handle_device_fd_with(void (handle_uevent)(struct uevent*))

		struct uevent uevent;
		parse_event(msg, &uevent);
		handle_uevent(&uevent);
		coldboot_action_t act = handle_uevent(&uevent);
		if (should_stop_coldboot(act))
		return act;
		}

		return COLDBOOT_CONTINUE;
		}

		void handle_device_fd()
		coldboot_action_t handle_device_fd(coldboot_callback fn)
		{
		handle_device_fd_with(
		[](struct uevent *uevent) {
		coldboot_action_t ret = handle_device_fd_with(
		[&](uevent* uevent) -> coldboot_action_t {
		if (selinux_status_updated() > 0) {
		struct selabel_handle *sehandle2;
		sehandle2 = selinux_android_file_context_handle();
		@@ -907,9 +922,21 @@ void handle_device_fd()
		}
		}

		// default is to always create the devices
		coldboot_action_t act = COLDBOOT_CREATE;
		if (fn) {
		act = fn(uevent);
		}

		if (act == COLDBOOT_CREATE \|\| act == COLDBOOT_STOP) {
		handle_device_event(uevent);
		handle_firmware_event(uevent);
		}

		return act;
		});

		return ret;
		}

		/* Coldboot walks parts of the /sys tree and pokes the uevent files
		@@ -921,10 +948,11 @@ void handle_device_fd()
		** socket's buffer.
		*/

		static void do_coldboot(DIR *d)
		static coldboot_action_t do_coldboot(DIR *d, coldboot_callback fn)
		{
		struct dirent *de;
		int dfd, fd;
		coldboot_action_t act = COLDBOOT_CONTINUE;

		dfd = dirfd(d);

		@@ -932,10 +960,12 @@ static void do_coldboot(DIR *d)
		if (fd >= 0) {
		write(fd, "add\n", 4);
		close(fd);
		handle_device_fd();
		act = handle_device_fd(fn);
		if (should_stop_coldboot(act))
		return act;
		}

		while((de = readdir(d))) {
		while (!should_stop_coldboot(act) && (de = readdir(d))) {
		DIR *d2;

		if(de->d_type != DT_DIR \|\| de->d_name[0] == '.')
		@@ -949,85 +979,31 @@ static void do_coldboot(DIR *d)
		if(d2 == 0)
		close(fd);
		else {
		do_coldboot(d2);
		act = do_coldboot(d2, fn);
		closedir(d2);
		}
		}

		// default is always to continue looking for uevents
		return act;
		}

		static void coldboot(const char *path)
		static coldboot_action_t coldboot(const char *path, coldboot_callback fn)
		{
		std::unique_ptr<DIR, decltype(&closedir)> d(opendir(path), closedir);
		if (d) {
		do_coldboot(d.get());
		}
		return do_coldboot(d.get(), fn);
		}

		static void early_uevent_handler(struct uevent uevent, const char base, bool is_block)
		{
		const char *name;
		char devpath[DEVPATH_LEN];

		if (is_block && strncmp(uevent->subsystem, "block", 5))
		return;

		name = parse_device_name(uevent, MAX_DEV_NAME);
		if (!name) {
		LOG(ERROR) << "Failed to parse dev name from uevent: " << uevent->action
		<< " " << uevent->partition_name << " " << uevent->partition_num
		<< " " << uevent->major << ":" << uevent->minor;
		return;
		return COLDBOOT_CONTINUE;
		}

		snprintf(devpath, sizeof(devpath), "%s%s", base, name);
		make_dir(base, 0755);

		dev_t dev = makedev(uevent->major, uevent->minor);
		mode_t mode = 0600 \| (is_block ? S_IFBLK : S_IFCHR);
		mknod(devpath, mode, dev);
		}

		void early_create_dev(const std::string& syspath, early_device_type dev_type)
		{
		android::base::unique_fd dfd(open(syspath.c_str(), O_RDONLY));
		if (dfd < 0) {
		LOG(ERROR) << "Failed to open " << syspath;
		return;
		}

		android::base::unique_fd fd(openat(dfd, "uevent", O_WRONLY));
		if (fd < 0) {
		LOG(ERROR) << "Failed to open " << syspath << "/uevent";
		return;
		}

		fcntl(device_fd, F_SETFL, O_NONBLOCK);

		write(fd, "add\n", 4);
		handle_device_fd_with(dev_type == EARLY_BLOCK_DEV ?
		[](struct uevent *uevent) {
		early_uevent_handler(uevent, "/dev/block/", true);
		} :
		[](struct uevent *uevent) {
		early_uevent_handler(uevent, "/dev/", false);
		});
		}

		int early_device_socket_open() {
		device_fd = uevent_open_socket(256*1024, true);
		return device_fd < 0;
		}

		void early_device_socket_close() {
		close(device_fd);
		}

		void device_init() {
		void device_init(const char* path, coldboot_callback fn) {
		sehandle = selinux_android_file_context_handle();
		selinux_status_open(true);

		/* is 256K enough? udev uses 16MB! */
		device_fd = uevent_open_socket(256*1024, true);
		device_fd.reset(uevent_open_socket(256*1024, true));
		if (device_fd == -1) {
		return;
		}
		@@ -1039,13 +1015,33 @@ void device_init() {
		}

		Timer t;
		coldboot("/sys/class");
		coldboot("/sys/block");
		coldboot("/sys/devices");
		coldboot_action_t act;
		if (!path) {
		act = coldboot("/sys/class", fn);
		if (!should_stop_coldboot(act)) {
		act = coldboot("/sys/block", fn);
		if (!should_stop_coldboot(act)) {
		act = coldboot("/sys/devices", fn);
		}
		}
		} else {
		act = coldboot(path, fn);
		}

		// If we have a callback, then do as it says. If no, then the default is
		// to always create COLDBOOT_DONE file.
		if (!fn \|\| (act == COLDBOOT_FINISH)) {
		close(open(COLDBOOT_DONE, O_WRONLY\|O_CREAT\|O_CLOEXEC, 0000));
		}

		LOG(INFO) << "Coldboot took " << t;
		}

		void device_close() {
		destroy_platform_devices();
		device_fd.reset();
		}

		int get_device_fd() {
		return device_fd;
		}

init/devices.h

+27 −6

Original line number	Diff line number	Diff line
		@@ -17,16 +17,37 @@
		#ifndef _INIT_DEVICES_H
		#define _INIT_DEVICES_H

		#include <functional>
		#include <sys/stat.h>

		extern void handle_device_fd();
		extern void device_init(void);
		enum coldboot_action_t {
		// coldboot continues without creating the device for the uevent
		COLDBOOT_CONTINUE = 0,
		// coldboot continues after creating the device for the uevent
		COLDBOOT_CREATE,
		// coldboot stops after creating the device for uevent but doesn't
		// create the COLDBOOT_DONE file
		COLDBOOT_STOP,
		// same as COLDBOOT_STOP, but creates the COLDBOOT_DONE file
		COLDBOOT_FINISH
		};

		enum early_device_type { EARLY_BLOCK_DEV, EARLY_CHAR_DEV };
		struct uevent {
		const char* action;
		const char* path;
		const char* subsystem;
		const char* firmware;
		const char* partition_name;
		const char* device_name;
		int partition_num;
		int major;
		int minor;
		};

		extern int early_device_socket_open();
		extern void early_device_socket_close();
		extern void early_create_dev(const std::string& syspath, early_device_type dev_type);
		typedef std::function<coldboot_action_t(struct uevent* uevent)> coldboot_callback;
		extern coldboot_action_t handle_device_fd(coldboot_callback fn = nullptr);
		extern void device_init(const char* path = nullptr, coldboot_callback fn = nullptr);
		extern void device_close();

		extern int add_dev_perms(const char name, const char attr,
		mode_t perm, unsigned int uid,

init/init.cpp

+214 −86

File changed.

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