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Commit 9a2bf07d authored by Yo Chiang's avatar Yo Chiang Committed by Automerger Merge Worker
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Merge "fs_mgr: Add OverlayMountPoints() to get the list of overlayfs backing... 

Merge "fs_mgr: Add OverlayMountPoints() to get the list of overlayfs backing storage" am: ec1b09fc

Original change: https://android-review.googlesource.com/c/platform/system/core/+/1585166

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I1024f9aeaa46d954f07ed3660b36314f76eca908
parents b8eed619 ec1b09fc

fs_mgr/fs_mgr_overlayfs.cpp

+33 −24
Original line number Diff line number Diff line
@@ -125,10 +125,38 @@ void TeardownAllOverlayForMountPoint(const std::string&) {} 


namespace {



bool fs_mgr_in_recovery() {

    // Check the existence of recovery binary instead of using the compile time

    // macro, because first-stage-init is compiled with __ANDROID_RECOVERY__

    // defined, albeit not in recovery. More details: system/core/init/README.md

    return fs_mgr_access("/system/bin/recovery");

}



bool fs_mgr_is_dsu_running() {

    // Since android::gsi::CanBootIntoGsi() or android::gsi::MarkSystemAsGsi() is

    // never called in recovery, the return value of android::gsi::IsGsiRunning()

    // is not well-defined. In this case, just return false as being in recovery

    // implies not running a DSU system.

    if (fs_mgr_in_recovery()) return false;

    auto saved_errno = errno;

    auto ret = android::gsi::IsGsiRunning();

    errno = saved_errno;

    return ret;

}



// list of acceptable overlayfs backing storage

const auto kScratchMountPoint = "/mnt/scratch"s;

const auto kCacheMountPoint = "/cache"s;

const std::vector<const std::string> kOverlayMountPoints = {kScratchMountPoint, kCacheMountPoint};



std::vector<const std::string> OverlayMountPoints() {

    // Never fallback to legacy cache mount point if within a DSU system,

    // because running a DSU system implies the device supports dynamic

    // partitions, which means legacy cache mustn't be used.

    if (fs_mgr_is_dsu_running()) {

        return {kScratchMountPoint};

    }

    return {kScratchMountPoint, kCacheMountPoint};

}



// Return true if everything is mounted, but before adb is started.  Right

// after 'trigger load_persist_props_action' is done.
@@ -169,25 +197,6 @@ bool fs_mgr_filesystem_has_space(const std::string& mount_point) { 
           (vst.f_bfree * vst.f_bsize) >= kSizeThreshold;

}



bool fs_mgr_in_recovery() {

    // Check the existence of recovery binary instead of using the compile time

    // macro, because first-stage-init is compiled with __ANDROID_RECOVERY__

    // defined, albeit not in recovery. More details: system/core/init/README.md

    return fs_mgr_access("/system/bin/recovery");

}



bool fs_mgr_is_dsu_running() {

    // Since android::gsi::CanBootIntoGsi() or android::gsi::MarkSystemAsGsi() is

    // never called in recovery, the return value of android::gsi::IsGsiRunning()

    // is not well-defined. In this case, just return false as being in recovery

    // implies not running a DSU system.

    if (fs_mgr_in_recovery()) return false;

    auto saved_errno = errno;

    auto ret = android::gsi::IsGsiRunning();

    errno = saved_errno;

    return ret;

}



const auto kPhysicalDevice = "/dev/block/by-name/"s;

constexpr char kScratchImageMetadata[] = "/metadata/gsi/remount/lp_metadata";
@@ -300,7 +309,7 @@ const auto kOverlayTopDir = "/overlay"s; 
std::string fs_mgr_get_overlayfs_candidate(const std::string& mount_point) {

    if (!fs_mgr_is_dir(mount_point)) return "";

    const auto base = android::base::Basename(mount_point) + "/";

    for (const auto& overlay_mount_point : kOverlayMountPoints) {

    for (const auto& overlay_mount_point : OverlayMountPoints()) {

        auto dir = overlay_mount_point + kOverlayTopDir + "/" + base;

        auto upper = dir + kUpperName;

        if (!fs_mgr_is_dir(upper)) continue;
@@ -1344,7 +1353,7 @@ bool fs_mgr_overlayfs_setup(const char* backing, const char* mount_point, bool* 
    if (candidates.empty()) return ret;



    std::string dir;

    for (const auto& overlay_mount_point : kOverlayMountPoints) {

    for (const auto& overlay_mount_point : OverlayMountPoints()) {

        if (backing && backing[0] && (overlay_mount_point != backing)) continue;

        if (overlay_mount_point == kScratchMountPoint) {

            if (!fs_mgr_overlayfs_setup_scratch(fstab, change)) continue;
@@ -1465,7 +1474,7 @@ bool fs_mgr_overlayfs_teardown(const char* mount_point, bool* change) { 
        }

    }

    bool should_destroy_scratch = false;

    for (const auto& overlay_mount_point : kOverlayMountPoints) {

    for (const auto& overlay_mount_point : OverlayMountPoints()) {

        ret &= fs_mgr_overlayfs_teardown_one(

                overlay_mount_point, mount_point ? fs_mgr_mount_point(mount_point) : "", change,

                overlay_mount_point == kScratchMountPoint ? &should_destroy_scratch : nullptr);
@@ -1569,7 +1578,7 @@ void TeardownAllOverlayForMountPoint(const std::string& mount_point) { 
    constexpr bool* ignore_change = nullptr;



    // Teardown legacy overlay mount points that's not backed by a scratch device.

    for (const auto& overlay_mount_point : kOverlayMountPoints) {

    for (const auto& overlay_mount_point : OverlayMountPoints()) {

        if (overlay_mount_point == kScratchMountPoint) {

            continue;

        }