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Commit 7427a1e8 authored by David Anderson's avatar David Anderson Committed by Automerger Merge Worker
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Merge "overlayfs: Use userxattrs on supporting kernels." am: 92b3b3ff am:... 

Merge "overlayfs: Use userxattrs on supporting kernels." am: 92b3b3ff am: b8336694 am: d8dc39be

Original change: https://android-review.googlesource.com/c/platform/system/core/+/1897866

Change-Id: I75757e7351a8f56c6678071bab52b57bbf2018ab
parents 32f79c6e d8dc39be

fs_mgr/fs_mgr_overlayfs.cpp

+14 −0
Original line number Diff line number Diff line
@@ -322,6 +322,17 @@ std::string fs_mgr_get_overlayfs_candidate(const std::string& mount_point) { 
const auto kLowerdirOption = "lowerdir="s;

const auto kUpperdirOption = "upperdir="s;



static inline bool KernelSupportsUserXattrs() {

    struct utsname uts;

    uname(&uts);



    int major, minor;

    if (sscanf(uts.release, "%d.%d", &major, &minor) != 2) {

        return false;

    }

    return major > 5 || (major == 5 && minor >= 15);

}



// default options for mount_point, returns empty string for none available.

std::string fs_mgr_get_overlayfs_options(const std::string& mount_point) {

    auto candidate = fs_mgr_get_overlayfs_candidate(mount_point);
@@ -331,6 +342,9 @@ std::string fs_mgr_get_overlayfs_options(const std::string& mount_point) { 
    if (fs_mgr_overlayfs_valid() == OverlayfsValidResult::kOverrideCredsRequired) {

        ret += ",override_creds=off";

    }

    if (KernelSupportsUserXattrs()) {

        ret += ",userxattr";

    }

    return ret;

}