multirom: Fix /data/media/0 media linkage for SDCardFS #11
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* In a MultiROM environment, /data is owned by the
booted secondary ROM, specifically it can even be
part of an external MicroSD (for example with EXT4)
* By using a ROM supporting SDCardFS, the interal
media storage will be accessed through its driver,
but the fact /data/media/0 could be used under
specific conditions means the /data/media mounts
used by the emulated storage loop through:
- /data/media (external ROM)
- /data/media/0 (internal storage)
* SDCardFS prevents "cross-device" linkage by
returning -EXDEV, breaking internal storage access
* Always use the proper /data/media path on newer APIs
to avoid any cross-device linkage of internal storage,
and preserve old handling up to API 22 (Android 5.1)
Change-Id: Ib49db68eede289d3943b9537d542eef5082e3118
Signed-off-by: Adrian DC <[email protected]>
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In a MultiROM environment, /data is owned by the
booted secondary ROM, specifically it can even be
part of an external MicroSD (for example with EXT4)
By using a ROM supporting SDCardFS, the interal
media storage will be accessed through its driver,
but the fact /data/media/0 could be used under
specific conditions means the /data/media mounts
used by the emulated storage loop through:
SDCardFS prevents "cross-device" linkage by
returning -EXDEV, breaking internal storage access
Always use the proper /data/media path on newer APIs
to avoid any cross-device linkage of internal storage,
and preserve old handling up to API 22 (Android 5.1)
Change-Id: Ib49db68eede289d3943b9537d542eef5082e3118
Signed-off-by: Adrian DC [email protected]