/** Save the contents of the FS image */
void saveFSImage(File fullimage, File edits) throws IOException {
File curFile = new File(fullimage, FS_IMAGE);
File newFile = new File(fullimage, NEW_FS_IMAGE);
File oldFile = new File(fullimage, OLD_FS_IMAGE);
//
// Write out data
//
DataOutputStream out =
new DataOutputStream(new BufferedOutputStream(new FileOutputStream(newFile)));
try {
out.writeInt(rootDir.numItemsInTree() - 1);
rootDir.saveImage("", out);
} finally {
out.close();
}
//
// Atomic move sequence
//
// 1. Move cur to old
curFile.renameTo(oldFile);
// 2. Move new to cur
newFile.renameTo(curFile);
// 3. Remove pending-edits file (it's been integrated with newFile)
edits.delete();
// 4. Delete old
oldFile.delete();
}
void saveImage(String parentPrefix, DataOutputStream out) throws IOException {
String fullName = "";
if (parent != null) {
fullName = parentPrefix + "/" + name;
new UTF8(fullName).write(out);
if (blocks == null) {
out.writeInt(0);
} else {
out.writeInt(blocks.length);
for (int i = 0; i < blocks.length; i++) {
blocks[i].write(out);
}
}
}
for (Iterator it = children.values().iterator(); it.hasNext(); ) {
INode child = (INode) it.next();
child.saveImage(fullName, out);
}
}
/** Write an operation to the edit log */
void logEdit(byte op, Writable w1, Writable w2) {
synchronized (editlog) {
try {
editlog.write(op);
if (w1 != null) {
w1.write(editlog);
}
if (w2 != null) {
w2.write(editlog);
}
} catch (IOException ie) {
}
}
}
/** Shutdown the filestore */
public void close() throws IOException {
editlog.close();
}