Set media folder +F for adopted storage as well

We previously only set +F for /data/media, but adopted storage needs
this as well. Instead we add support for adding attrs to PrepareDir.

Bug: 163453310
Test: sm set-virtual-disk true
      follow UI setup and confirm +F on /mnt/expand/*/media
Change-Id: I08f13b57a4de3538e88b38eb95b0ac115a5a5ce8
Merged-In: I08f13b57a4de3538e88b38eb95b0ac115a5a5ce8

Utils.cpp

@@ -416,7 +416,32 @@ int PrepareAppDirFromRoot(const std::string& path, const std::string& root, int
     return OK;
 }
 
-status_t PrepareDir(const std::string& path, mode_t mode, uid_t uid, gid_t gid) {
+int SetAttrs(const std::string& path, unsigned int attrs) {
+    unsigned long flags;
+    android::base::unique_fd fd(
+            TEMP_FAILURE_RETRY(open(path.c_str(), O_RDONLY | O_NONBLOCK | O_CLOEXEC)));
+
+    if (fd == -1) {
+        PLOG(ERROR) << "Failed to open " << path;
+        return -1;
+    }
+
+    if (ioctl(fd, FS_IOC_GETFLAGS, (void*)&flags)) {
+        PLOG(ERROR) << "Failed to get flags for " << path;
+        return -1;
+    }
+
+    if ((flags & attrs) == attrs) return 0;
+    flags |= attrs;
+    if (ioctl(fd, FS_IOC_SETFLAGS, (void*)&flags)) {
+        PLOG(ERROR) << "Failed to set flags for " << path << "(0x" << std::hex << attrs << ")";
+        return -1;
+    }
+    return 0;
+}
+
+status_t PrepareDir(const std::string& path, mode_t mode, uid_t uid, gid_t gid,
+                    unsigned int attrs) {
     std::lock_guard<std::mutex> lock(kSecurityLock);
     const char* cpath = path.c_str();
 
@@ -434,6 +459,9 @@ status_t PrepareDir(const std::string& path, mode_t mode, uid_t uid, gid_t gid)
         freecon(secontext);
     }
 
+    if (res) return -errno;
+    if (attrs) res = SetAttrs(path, attrs);
+
     if (res == 0) {
         return OK;
     } else {

Utils.h

@@ -67,7 +67,8 @@ int PrepareAppDirFromRoot(const std::string& path, const std::string& root, int
                           bool fixupExisting);
 
 /* fs_prepare_dir wrapper that creates with SELinux context */
-status_t PrepareDir(const std::string& path, mode_t mode, uid_t uid, gid_t gid);
+status_t PrepareDir(const std::string& path, mode_t mode, uid_t uid, gid_t gid,
+                    unsigned int attrs = 0);
 
 /* Really unmounts the path, killing active processes along the way */
 status_t ForceUnmount(const std::string& path);

model/PrivateVolume.cpp

@@ -166,11 +166,14 @@ status_t PrivateVolume::doMount() {
 
     RestoreconRecursive(mPath);
 
+    int attrs = 0;
+    if (!IsSdcardfsUsed()) attrs = FS_CASEFOLD_FL;
+
     // Verify that common directories are ready to roll
     if (PrepareDir(mPath + "/app", 0771, AID_SYSTEM, AID_SYSTEM) ||
         PrepareDir(mPath + "/user", 0711, AID_SYSTEM, AID_SYSTEM) ||
         PrepareDir(mPath + "/user_de", 0711, AID_SYSTEM, AID_SYSTEM) ||
-        PrepareDir(mPath + "/media", 0770, AID_MEDIA_RW, AID_MEDIA_RW) ||
+        PrepareDir(mPath + "/media", 0770, AID_MEDIA_RW, AID_MEDIA_RW, attrs) ||
         PrepareDir(mPath + "/media/0", 0770, AID_MEDIA_RW, AID_MEDIA_RW) ||
         PrepareDir(mPath + "/local", 0751, AID_ROOT, AID_ROOT) ||
         PrepareDir(mPath + "/local/tmp", 0771, AID_SHELL, AID_SHELL)) {