libaums

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Hi, first I would like to say how great the library is! It has helped me so much!

I have reading from a fat16 device working really well, but I am stuck on deleting files and then writing.

I understand that the javafs integration is experimental at the moment but I cannot figure out why the delete function is not working. I am getting this info from the log:

W/System.err: java.io.IOException: free entry in chain at: 31254 at org.jnode.fs.jfat.FatChain$ChainIterator.next(FatChain.java:711) at org.jnode.fs.jfat.FatChain.freeAllClusters(FatChain.java:323) at org.jnode.fs.jfat.FatEntry.freeAllClusters(FatEntry.java:96) at org.jnode.fs.jfat.FatDirectory.remove(FatDirectory.java:363) W/System.err: at com.github.magnusja.libaums.javafs.wrapper.fs.UsbFileWrapper.delete(UsbFileWrapper.java:222)

Any help would be very much appreciated!!

Hey

I actually dont know why that happens. I think there is another fat implementation in JNode. Try commenting out his line: https://github.com/magnusja/libaums/blob/develop/javafs/src/main/java/com/github/magnusja/libaums/javafs/JavaFsFileSystemCreator.java#L50

I tried commenting out "fsTypes.add(new FatFileSystemType());" and .listFiles(); seemed to stop working beyond the root directory.

"Caused by: java.lang.NullPointerException: Attempt to get length of null array"

I commented out "fsTypes.add(new org.jnode.fs.fat.FatFileSystemType());" instead and got:

W/System.err: java.io.IOException: circular chain at: 0 W/System.err: at org.jnode.fs.jfat.FatChain$ChainIterator.next(FatChain.java:708) at org.jnode.fs.jfat.FatChain.freeAllClusters(FatChain.java:323) at org.jnode.fs.jfat.FatEntry.freeAllClusters(FatEntry.java:96) at org.jnode.fs.jfat.FatDirectory.remove(FatDirectory.java:363) at com.github.magnusja.libaums.javafs.wrapper.fs.UsbFileWrapper.delete(UsbFileWrapper.java:222)

Thank you so much for your help and time!

Well, that's bad. I really don't know whats wrong here.

You could try to update https://github.com/magnusja/java-fs with recent changes from https://github.com/tmyroadctfig/jnode and see if it works then.

@Metske I saw that you forked java-fs, any luck with updating from jnode master?

Hi, Yeah I forked it and committed the changes not sure exactly how to link up with these changes though. The javafs module in the Libuams development library has "com.github.magnusja:java-fs:0.1.3" as a dependency. ( "https://github.com/magnusja/java-fs" is version 0.1.2 ?)

I tried importing my fork in as a module and refactoring but I got into a whole load of compiling issues.

Sorry still fairly new to github and not 100% sure what to do.

Used jitpack and added my fork as the dependency, still getting a lot of "W/System.err: java.io.IOException: circular chain at: 0" errors!

What happens if you remove the comment you added, and use the other FAT32 implementation? Maybe there are some recent fixes.

Finally had some time to sit down and look at this again, I still haven't managed to get anywhere. One time I tried and it started working a bit and it was writing fine up until the last file then it crashed with "Free entry in chain at: 1" I haven't been able to reproduce this again. I tried with the other implementation but it won't initialize due to UnixFSAccessRights issues.

One thing I don't think I've mentioned is I get this when initializing:

I/ScsiBlockDevice: Block size: 512 I/ScsiBlockDevice: Last block address: 786431 I/FileSystemPartitionTable: Found a device without partition table, yay! W/FileSystemPartitionTable: fs capacity is not multiple of block size

Should be fixed in v0.9.4