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Commit 515a5bdd authored by David Anderson's avatar David Anderson
Browse files

ueventd: Put dm-user devices in a folder 



When a device-mapper table contains a "user" entry, a corresponding
dm-user misc control device is created. The devices are put into a
separate folder by default, which currently confuses ueventd, and we
wind up with paths like:

    /dev/dm-user!blah

Special case these devices so they wind up as:

    /dev/dm-user/blah

Test: dmctl create blah user 0 100 test-device
      /dev/dm-user/test-device exists
Signed-off-by: default avatarPalmer Dabbelt <palmerdabbelt@google.com>
Change-Id: I313db07c3400f14f3ed0ffa20fdac2ac3e34b6d3
parent fe1eba00

init/devices.cpp

+10 −0
Original line number Diff line number Diff line
@@ -22,6 +22,7 @@ 
#include <unistd.h>



#include <chrono>

#include <filesystem>

#include <memory>

#include <string>

#include <thread>
@@ -439,6 +440,13 @@ void DeviceHandler::HandleDevice(const std::string& action, const std::string& d 
            }

        }

        unlink(devpath.c_str());



        if (android::base::StartsWith(devpath, "/dev/dm-user/")) {

            std::error_code ec;

            if (std::filesystem::is_empty("/dev/dm-user/", ec)) {

                rmdir("/dev/dm-user");

            }

        }

    }

}
@@ -496,6 +504,8 @@ void DeviceHandler::HandleUevent(const Uevent& uevent) { 
    } else if (StartsWith(uevent.subsystem, "usb")) {

        // ignore other USB events

        return;

    } else if (uevent.subsystem == "misc" && StartsWith(uevent.device_name, "dm-user/")) {

        devpath = "/dev/dm-user/" + uevent.device_name.substr(8);

    } else {

        devpath = "/dev/" + Basename(uevent.path);

    }