Details
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Bug
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Status: Open
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Major
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Resolution: Unresolved
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prefs-1.0.6
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None
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None
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Angstroem Embedded Linux
UBIFS on a flash drive
Description
I ran in to the following problem using the Preferences Service on an embedded device with a flash memory:
When a preference is changed the sync method is called to persist it. A sudden power loss occurs. On restart the preference file in the bundle cache is empty and causes a BackingStoreException: Could not load preference.
It seems to me as that the OS is caching the write to the flash drive and the change is not actually persisted. I was able to fix this issue by performing a sync on the FileDescriptor of the OutputStream in the store method of the DataFileBackingStoreImpl
try {
final FileOutputStream os = (FileOutputStream) this.getOutputStream(root.getDescription());
this.write(root, os);
os.getFD().sync();
os.close();
}
catch (IOException ioe) {
throw new BackingStoreException("Unable to store preferences.", ioe);
}