@Override
public void setMetadata(FileMetadata metadata, byte type, AtomicDBUpdate update)
throws DatabaseException {
assert (metadata instanceof BufferBackedFileMetadata);
BufferBackedFileMetadata md = (BufferBackedFileMetadata) metadata;
int index = md.getIndexId();
if (type == -1)
for (byte i = 0; i < BufferBackedFileMetadata.NUM_BUFFERS; i++) {
byte[] valBuf = md.getValueBuffer(i);
assert (valBuf != null);
update.addUpdate(
index,
index == FILE_ID_INDEX
? BabuDBStorageHelper.createFileIdIndexKey(metadata.getId(), i)
: md.getKeyBuffer(i),
valBuf);
}
else {
byte[] valBuf = md.getValueBuffer(type);
assert (valBuf != null);
update.addUpdate(
index,
index == FILE_ID_INDEX
? BabuDBStorageHelper.createFileIdIndexKey(metadata.getId(), type)
: md.getKeyBuffer(type),
valBuf);
}
}
@Override
public void startRequest(MRCRequest rq) throws Throwable {
final removexattrRequest rqArgs = (removexattrRequest) rq.getRequestArgs();
final VolumeManager vMan = master.getVolumeManager();
final FileAccessManager faMan = master.getFileAccessManager();
Path p = new Path(rqArgs.getVolumeName(), rqArgs.getPath());
validateContext(rq);
StorageManager sMan = vMan.getStorageManagerByName(p.getComp(0));
PathResolver res = new PathResolver(sMan, p);
// check whether the path prefix is searchable
faMan.checkSearchPermission(
sMan, res, rq.getDetails().userId, rq.getDetails().superUser, rq.getDetails().groupIds);
// check whether file exists
res.checkIfFileDoesNotExist();
// retrieve and prepare the metadata to return
FileMetadata file = res.getFile();
AtomicDBUpdate update = sMan.createAtomicDBUpdate(master, rq);
// if the attribute is a system attribute, set it
final String attrKey = rqArgs.getName();
// set a system attribute
if (attrKey.startsWith("xtreemfs.")) {
// check whether the user has privileged permissions to set
// system attributes
faMan.checkPrivilegedPermissions(
sMan, file, rq.getDetails().userId, rq.getDetails().superUser, rq.getDetails().groupIds);
MRCHelper.setSysAttrValue(
sMan, vMan, faMan, res.getParentDirId(), file, attrKey.substring(9), "", update);
}
// set a user attribute
else {
sMan.setXAttr(file.getId(), rq.getDetails().userId, attrKey, null, update);
}
// update POSIX timestamps
int time = (int) (TimeSync.getGlobalTime() / 1000);
MRCHelper.updateFileTimes(res.getParentDirId(), file, false, true, false, sMan, time, update);
// set the response
rq.setResponse(timestampResponse.newBuilder().setTimestampS(time).build());
update.execute();
}
protected static StatVFS getVolumeInfo(MRCRequestDispatcher master, StorageManager sMan)
throws DatabaseException {
final VolumeInfo volume = sMan.getVolumeInfo();
final FileMetadata volumeRoot = sMan.getMetadata(1);
int blockSize = sMan.getDefaultStripingPolicy(1).getStripeSize() * 1024;
long bavail = master.getOSDStatusManager().getUsableSpace(volume.getId()) / blockSize;
long bfree = master.getOSDStatusManager().getFreeSpace(volume.getId()) / blockSize;
long blocks = master.getOSDStatusManager().getTotalSpace(volume.getId()) / blockSize;
String volumeId = volume.getId();
AccessControlPolicyType acPolId = AccessControlPolicyType.valueOf(volume.getAcPolicyId());
StripingPolicy.Builder defaultStripingPolicy =
Converter.stripingPolicyToStripingPolicy(sMan.getDefaultStripingPolicy(1));
String volumeName = volume.getName();
String owningGroupId = volumeRoot.getOwningGroupId();
String ownerId = volumeRoot.getOwnerId();
int perms = volumeRoot.getPerms();
long newEtag = blockSize + bavail + blocks;
return StatVFS.newBuilder()
.setBsize(blockSize)
.setBfree(bfree)
.setBavail(bavail)
.setBlocks(blocks)
.setFsid(volumeId)
.setNamemax(1024)
.setOwnerUserId(ownerId)
.setOwnerGroupId(owningGroupId)
.setName(volumeName)
.setEtag(newEtag)
.setMode(perms)
.setAccessControlPolicy(acPolId)
.setDefaultStripingPolicy(defaultStripingPolicy)
.build();
}
@Override
public void link(
final FileMetadata metadata,
final long newParentId,
final String newFileName,
final AtomicDBUpdate update) {
// get the link source
BufferBackedFileMetadata md = (BufferBackedFileMetadata) metadata;
// increment the link count
short links = metadata.getLinkCount();
md.setLinkCount((short) (links + 1));
// insert the whole metadata of the original file in the file ID
// index
update.addUpdate(
FILE_ID_INDEX,
BabuDBStorageHelper.createFileIdIndexKey(metadata.getId(), FileMetadata.FC_METADATA),
md.getFCMetadataValue());
update.addUpdate(
FILE_ID_INDEX,
BabuDBStorageHelper.createFileIdIndexKey(metadata.getId(), FileMetadata.RC_METADATA),
md.getRCMetadata().getValue());
// remove the back link
update.addUpdate(
FILE_ID_INDEX, BabuDBStorageHelper.createFileIdIndexKey(metadata.getId(), (byte) 3), null);
// if the metadata was retrieved from the FILE_INDEX and hasn't
// been deleted before (i.e. links == 0), ensure that the original
// file in the file index now points to the file ID index, and
// remove the FC and XLoc metadata entries
if (links != 0 && md.getIndexId() == FILE_INDEX) {
update.addUpdate(
FILE_INDEX,
md.getRCMetadata().getKey(),
BabuDBStorageHelper.createLinkTarget(metadata.getId()));
update.addUpdate(FILE_INDEX, md.getFCMetadataKey(), null);
}
// create an entry for the new link to the metadata in the file
// index
update.addUpdate(
FILE_INDEX,
BabuDBStorageHelper.createFileKey(newParentId, newFileName, FileMetadata.RC_METADATA),
BabuDBStorageHelper.createLinkTarget(metadata.getId()));
}
@Override
public void createSnapshot(String snapName, long parentId, String dirName, boolean recursive)
throws DatabaseException {
try {
// determine the prefixes for the snapshot
byte[][][] prefixes = null;
FileMetadata snapDir = getMetadata(parentId, dirName);
// for a full volume snapshot, simply use a 'null' prefix (full:
// dirID == 1 && recursive)
if (snapDir.getId() != 1 || !recursive) {
// get the IDs of all files and directories contained in the
// given directory; if recursive == true, include subdirectories
List<FileMetadata> nestedFiles = new LinkedList<FileMetadata>();
BabuDBStorageHelper.getNestedFiles(nestedFiles, database, snapDir.getId(), recursive);
List<byte[]> dirEntryPrefixes = new ArrayList<byte[]>(nestedFiles.size());
List<byte[]> filePrefixes = new ArrayList<byte[]>(nestedFiles.size());
// include the extended attributes of the volume's root
// directory if it's not the snapshot directory - they are
// needed to access volume-wide parameters in the snapshot, such
// as the access control policy
if (snapDir.getId() != 1) filePrefixes.add(ByteBuffer.wrap(new byte[8]).putLong(1).array());
// include all metadata of the snapshot (i.e. top level) dir
byte[] idxKey = BabuDBStorageHelper.createFileKey(parentId, dirName, (byte) -1);
byte[] fileKey = BabuDBStorageHelper.createFilePrefixKey(snapDir.getId());
dirEntryPrefixes.add(idxKey);
filePrefixes.add(fileKey);
// include the snapshot directory content
idxKey = BabuDBStorageHelper.createFilePrefixKey(snapDir.getId());
dirEntryPrefixes.add(idxKey);
// determine the key prefixes of all nested files to include and
// exclude
for (FileMetadata file : nestedFiles) {
// create a prefix key for the nested file
byte[] key = BabuDBStorageHelper.createFilePrefixKey(file.getId());
// if the nested file is a directory, ...
if (file.isDirectory()) {
// include the directory in the file prefixes
// and the directory prefix in the dir entry prefixes
filePrefixes.add(key);
dirEntryPrefixes.add(key);
}
// if the nested file is a file, ...
else filePrefixes.add(key);
}
byte[][] dirEntryPrefixesA = dirEntryPrefixes.toArray(new byte[dirEntryPrefixes.size()][]);
byte[][] filePrefixesA = filePrefixes.toArray(new byte[filePrefixes.size()][]);
Arrays.sort(dirEntryPrefixesA, DefaultByteRangeComparator.getInstance());
Arrays.sort(filePrefixesA, DefaultByteRangeComparator.getInstance());
// FILE_INDEX, XATTRS_INDEX, ACL_INDEX, FILE_ID_INDEX,
// VOLUME_INDEX
prefixes =
new byte[][][] {dirEntryPrefixesA, filePrefixesA, filePrefixesA, filePrefixesA, null};
}
// create the snapshot
SnapshotConfig snap = new DefaultSnapshotConfig(snapName, ALL_INDICES, prefixes, null);
snapMan.createPersistentSnapshot(database.getName(), snap);
} catch (BabuDBException exc) {
throw new DatabaseException(exc);
}
}