@Override public short unlink(final long parentId, final String fileName, final AtomicDBUpdate update) throws DatabaseException { try { // retrieve the file metadata BufferBackedFileMetadata file = BabuDBStorageHelper.getMetadata(database, parentId, fileName); // determine and set the new link count short newLinkCount = (short) (file.getLinkCount() - 1); file.setLinkCount(newLinkCount); // if there will be links remaining after the deletion, update the // link count; it must be in the FILE_ID_INDEX, because there have // been at least two links if (newLinkCount > 0) update.addUpdate( FILE_ID_INDEX, BabuDBStorageHelper.createFileIdIndexKey(file.getId(), FileMetadata.RC_METADATA), file.getRCMetadata().getValue()); // remove all entries from the file index update.addUpdate( FILE_INDEX, BabuDBStorageHelper.createFileKey(parentId, fileName, FileMetadata.FC_METADATA), null); update.addUpdate( FILE_INDEX, BabuDBStorageHelper.createFileKey(parentId, fileName, FileMetadata.RC_METADATA), null); return newLinkCount; } catch (BabuDBException exc) { throw new DatabaseException(exc); } }
@Override public short delete(final long parentId, final String fileName, final AtomicDBUpdate update) throws DatabaseException { try { // retrieve the file metadata BufferBackedFileMetadata file = BabuDBStorageHelper.getMetadata(database, parentId, fileName); // check whether there is only one link remaining short newLinkCount = (short) (file.getLinkCount() - 1); assert (newLinkCount >= 0); // decrement the link count file.setLinkCount(newLinkCount); // if there will be links remaining after the deletion, update the // link count if (newLinkCount > 0) update.addUpdate( FILE_ID_INDEX, BabuDBStorageHelper.createFileIdIndexKey(file.getId(), FileMetadata.RC_METADATA), file.getRCMetadata().getValue()); // delete all keys ... // remove all content from the file index update.addUpdate( BabuDBStorageManager.FILE_INDEX, BabuDBStorageHelper.createFileKey(parentId, fileName, FileMetadata.FC_METADATA), null); update.addUpdate( BabuDBStorageManager.FILE_INDEX, BabuDBStorageHelper.createFileKey(parentId, fileName, FileMetadata.RC_METADATA), null); // if the last link to the file is supposed to be deleted, remove // the remaining metadata, including ACLs and XAttrs if (newLinkCount == 0) { // remove the back link from the file ID index update.addUpdate( BabuDBStorageManager.FILE_ID_INDEX, BabuDBStorageHelper.createFileIdIndexKey(file.getId(), (byte) 3), null); // remove potentially existing metadata from the file ID index update.addUpdate( BabuDBStorageManager.FILE_ID_INDEX, BabuDBStorageHelper.createFileIdIndexKey(file.getId(), FileMetadata.FC_METADATA), null); update.addUpdate( BabuDBStorageManager.FILE_ID_INDEX, BabuDBStorageHelper.createFileIdIndexKey(file.getId(), FileMetadata.RC_METADATA), null); byte[] idBytes = new byte[8]; ByteBuffer.wrap(idBytes).putLong(file.getId()); // remove all ACLs ResultSet<byte[], byte[]> it = database.prefixLookup(BabuDBStorageManager.ACL_INDEX, idBytes, null).get(); while (it.hasNext()) update.addUpdate(BabuDBStorageManager.ACL_INDEX, it.next().getKey(), null); it.free(); // remove all extended attributes it = database.prefixLookup(BabuDBStorageManager.XATTRS_INDEX, idBytes, null).get(); while (it.hasNext()) update.addUpdate(BabuDBStorageManager.XATTRS_INDEX, it.next().getKey(), null); it.free(); // if a file is deleted, update file count and volume size if (file.isDirectory()) { updateCount(NUM_DIRS_KEY, false, update); } else if (file.getXLocList() != null) { volume.updateVolumeSize(-file.getSize(), update); updateCount(NUM_FILES_KEY, false, update); } } return file.getLinkCount(); } catch (BabuDBException exc) { throw new DatabaseException(exc); } }