Only enable quotas when supported by device.

Otherwise we might end up creating ext4 partitions that the device
can't mount.

Bug: 63763609
Test: builds, boots
Exempt-From-Owner-Approval: Bug 63673347
Change-Id: I5f6cf73f23a55bc0dea9480523f19049313c3dd1

fs/Ext4.cpp

@@ -38,6 +38,7 @@
 #define LOG_TAG "Vold"
 
 #include <android-base/logging.h>
+#include <android-base/properties.h>
 #include <android-base/stringprintf.h>
 #include <cutils/log.h>
 #include <cutils/properties.h>
@@ -176,7 +177,10 @@ status_t Format(const std::string& source, unsigned long numSectors,
     cmd.push_back("-M");
     cmd.push_back(target);
 
-    std::string options("has_journal,quota");
+    std::string options("has_journal");
+    if (android::base::GetBoolProperty("vold.has_quota", false)) {
+        options += ",quota";
+    }
     if (e4crypt_is_native()) {
         options += ",encrypt";
     }

main.cpp

@@ -39,7 +39,7 @@
 #include <dirent.h>
 #include <fs_mgr.h>
 
-static int process_config(VolumeManager *vm, bool* has_adoptable);
+static int process_config(VolumeManager *vm, bool* has_adoptable, bool* has_quota);
 static void coldboot(const char *path);
 static void parse_args(int argc, char** argv);
 
@@ -107,8 +107,9 @@ int main(int argc, char** argv) {
     }
 
     bool has_adoptable;
+    bool has_quota;
 
-    if (process_config(vm, &has_adoptable)) {
+    if (process_config(vm, &has_adoptable, &has_quota)) {
         PLOG(ERROR) << "Error reading configuration... continuing anyways";
     }
 
@@ -133,6 +134,7 @@ int main(int argc, char** argv) {
     // This call should go after listeners are started to avoid
     // a deadlock between vold and init (see b/34278978 for details)
     property_set("vold.has_adoptable", has_adoptable ? "1" : "0");
+    property_set("vold.has_quota", has_quota ? "1" : "0");
 
     // Do coldboot here so it won't block booting,
     // also the cold boot is needed in case we have flash drive
@@ -214,7 +216,7 @@ static void coldboot(const char *path) {
     }
 }
 
-static int process_config(VolumeManager *vm, bool* has_adoptable) {
+static int process_config(VolumeManager *vm, bool* has_adoptable, bool* has_quota) {
     fstab = fs_mgr_read_fstab_default();
     if (!fstab) {
         PLOG(ERROR) << "Failed to open default fstab";
@@ -223,7 +225,12 @@ static int process_config(VolumeManager *vm, bool* has_adoptable) {
 
     /* Loop through entries looking for ones that vold manages */
     *has_adoptable = false;
+    *has_quota = false;
     for (int i = 0; i < fstab->num_entries; i++) {
+        if (fs_mgr_is_quota(&fstab->recs[i])) {
+            *has_quota = true;
+        }
+
         if (fs_mgr_is_voldmanaged(&fstab->recs[i])) {
             if (fs_mgr_is_nonremovable(&fstab->recs[i])) {
                 LOG(WARNING) << "nonremovable no longer supported; ignoring volume";