ext4 and f2fs are supported only for private volumes (Adoptable Storage). Public volume (secondary external storage) is not directly accessible to apps or readable as emulated filesystem. With root access you can manually mount ext4 filesystem (on USB stick or SD card) with proper permissions (after vold fails) and read/write files there.įor details see How to save files to external SD card? But it's writable only through Storage Access Framework APIs. Use sdcardfs or FUSE to emulate the filesystem for fixed permissions. But this way Android framework is unaware of mounted filesystem and Android apps won't be notified of new storage. Neither you can manage the mounted storage from device Settings. Going Android-ish way, many custom ROMs include a patched vold which can handle NTFS, ext4 and f2fs filesystems, as well as Linux ( 0x83) partition type. GUID for that type was added in another patch in order to correctly identify ext4. This patched vold is also available as a Magisk module vold-posix, or you can build yourself from source code to manually add it to /system.
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