From 61a0a35dd5ef7dc73c49dee549296765c8fcb706 Mon Sep 17 00:00:00 2001
From: Jaegeuk Kim <jaegeuk@google.com>
Date: Mon, 8 Nov 2021 14:01:07 -0800
Subject: [PATCH] Compress .so files for PackageManager to reclaim the space

Let's set compression bit to compress .so files in first place for PM.
If the underlying filesystem like f2fs supports per-file compression, we can
give the compressed space back to user.

Bug: 188859114
Signed-off-by: Jaegeuk Kim <jaegeuk@google.com>
Change-Id: I6f261946c0a076ec50ec41bfe031f4438fed4db8
---
 ...m_android_internal_content_NativeLibraryHelper.cpp | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/core/jni/com_android_internal_content_NativeLibraryHelper.cpp b/core/jni/com_android_internal_content_NativeLibraryHelper.cpp
index be82879c8411..ef6fd7dd6829 100644
--- a/core/jni/com_android_internal_content_NativeLibraryHelper.cpp
+++ b/core/jni/com_android_internal_content_NativeLibraryHelper.cpp
@@ -36,6 +36,7 @@
 #include <inttypes.h>
 #include <sys/stat.h>
 #include <sys/types.h>
+#include <linux/fs.h>
 
 #include <memory>
 
@@ -253,6 +254,16 @@ copyFileIfChanged(JNIEnv *env, void* arg, ZipFileRO* zipFile, ZipEntryRO zipEntr
         return INSTALL_FAILED_CONTAINER_ERROR;
     }
 
+    // If a filesystem like f2fs supports per-file compression, set the compression bit before data
+    // writes
+    unsigned int flags;
+    if (ioctl(fd, FS_IOC_GETFLAGS, &flags) == -1) {
+        ALOGE("Failed to call FS_IOC_GETFLAGS on %s: %s\n", localTmpFileName, strerror(errno));
+    } else if ((flags & FS_COMPR_FL) == 0) {
+        flags |= FS_COMPR_FL;
+        ioctl(fd, FS_IOC_SETFLAGS, &flags);
+    }
+
     if (!zipFile->uncompressEntry(zipEntry, fd)) {
         ALOGE("Failed uncompressing %s to %s\n", fileName, localTmpFileName);
         close(fd);