public void AddFileLock(FileLockItem lockItem)
{
if (lockItem == null)
{
return;
}
else
{
this.pLocks.Add(lockItem);
}
}
public void RemoveFileLock(FileLockItem lockItem)
{
if (lockItem == null)
{
return;
}
else
{
this.pLocks.Remove(lockItem);
}
}
/// <summary>
/// Sets the specified accesses and shares to the file. If false is returned, the lock cannot be set.
/// </summary>
/// <param name="fileHandle"></param>
/// <param name="item"></param>
/// <param name="access"></param>
/// <param name="share"></param>
/// <returns></returns>
public static bool FilelockSet(FileHandler fileHandle, IFuserFilesystemItem item, FuserFileAccess access, FileShare share)
{
FileLockItem lItem = null;
try {
lItem = new FileLockItem((item is IFuserFilesystemDirectory), (access == FuserFileAccess.Read || access == FuserFileAccess.ReadWrite), (access == FuserFileAccess.Write || access == FuserFileAccess.ReadWrite), share);
} catch {
return(false);
}
return(FilelockSet(fileHandle, item, lItem));
}
private bool CheckShareOPLockIsPermit(FileLockItem otherRule)
{
if (this.pIsOpLock != otherRule.IsOpLock)
{
return(true); // OPlock must always be valid with another rule, otherwise no OPLocks can be registered.
}
if (!this.pIsOpLock)
{
return(true); // Should never occur anyway.
}
return(CheckOPLockRange(otherRule.OPLockOffset, otherRule.OPLockLength));
}
public bool RegisterLock(FileLockItem flock)
{
bool isDir = flock.IsDirectory;
foreach (FileLockItem el in this.fLocks)
{
if (el.IsDirectory != flock.IsDirectory)
{
// Locks for directories may only be compared with those of directories.
return(false);
}
if (!flock.CheckShareRuleIsPermit(el))
{
return(false); // Access violation found
}
}
this.fLocks.Add(flock);
return(true);
}
public void UnregisterLock(FileLockItem flock)
{
this.fLocks.Remove(flock);
}
public void ReleaseBlockDeletePermission(FileLockItem flock)
{
this.BlockDeletePermissionList.Remove(flock);
}
public void RegisterBlockDeletePermission(FileLockItem flock)
{
this.BlockDeletePermissionList.Add(flock);
}
public bool CheckShareRuleIsPermit(FileLockItem otherRule)
{
if (pIsDirectory != otherRule.IsDirectory)
{
return(false);
}
if (this.pIsDirectory)
{
return(true); // As long as CreateDirectory and OpenDirectory do not return correct FileShare/FileAccess values, this workaround must remain active.
}
if (this.pIsOpLock || otherRule.IsOpLock)
{
return(CheckShareOPLockIsPermit(otherRule));
}
FileShare shareO = otherRule.Share;
bool shareReadT = false;
bool shareWriteT = false;
bool shareReadO = false;
bool shareWriteO = false;
if (pShare.HasFlag(FileShare.Read))
{
shareReadT = true;
}
if (pShare.HasFlag(FileShare.Write))
{
shareWriteT = true;
}
if (pShare.HasFlag(FileShare.ReadWrite))
{
shareReadT = true; shareWriteT = true;
}
if (shareO.HasFlag(FileShare.Read))
{
shareReadO = true;
}
if (shareO.HasFlag(FileShare.Write))
{
shareWriteO = true;
}
if (shareO.HasFlag(FileShare.ReadWrite))
{
shareReadO = true; shareWriteO = true;
}
if (shareReadT == false && shareWriteT == false)
{
if (otherRule.AccessModeWrite || otherRule.AccessModeRead)
{
return(false); // Authorised Share: none
}
}
if (shareReadO == false && shareWriteO == false)
{
if (this.AccessModeWrite || this.AccessModeRead)
{
return(false); // Authorised Share: none
}
}
if (shareReadT == true && shareWriteT == false)
{
if (otherRule.AccessModeWrite == true)
{
return(false);
}
}
if (shareReadO == true && shareWriteO == false)
{
if (this.AccessModeWrite == true)
{
return(false);
}
}
if (shareReadT == false && shareWriteT == true)
{
if (otherRule.AccessModeRead == true)
{
return(false);
}
}
if (shareReadO == false && shareWriteO == true)
{
if (this.AccessModeRead == true)
{
return(false);
}
}
if (shareReadT == true && shareWriteT == true)
{
}
if (shareReadO == true && shareWriteO == true)
{
}
return(true);
}
/// <summary>
/// Sets the specified FileLock on the file and saves it in the file handle. Returns whether the setting is successful;
/// if False is returned, the file is already blocked by another process.
/// </summary>
/// <param name="fileHandle"></param>
/// <param name="fsItem"></param>
/// <param name="LockItem"></param>
/// <returns></returns>
public static bool FilelockSet(FileHandler fileHandle, IFuserFilesystemItem fsItem, FileLockItem LockItem)
{
if (LockItem == null || fileHandle == null || fsItem == null)
{
return(false);
}
try {
bool ret = false;
FileLockManager lockMgr = fsItem.Filelock;
if (lockMgr == null)
{
return(false);
}
lock (lockMgr) {
ret = lockMgr.RegisterLock(LockItem);
}
if (ret && fsItem is IFuserFilesystemDirectory && LockItem.IsDirectory && !LockItem.IsOpLock && !LockItem.Share.HasFlag(FileShare.Delete))
{
RegisterBlockDeletePermission((IFuserFilesystemDirectory)fsItem, LockItem);
}
if (ret)
{
lock (fileHandle) {
fileHandle.AddFileLock(LockItem);
}
}
else
{
return(false); // access violation occurred
}
} catch {
return(false);
}
return(true);
}
/// <summary>
/// Removes the lock for deleting directories for all directories (recursive up to the root).
/// </summary>
/// <param name="blockDirectory"></param>
/// <param name="flock"></param>
private static void ReleaseBlockDeletePermission(IFuserFilesystemDirectory blockDirectory, FileLockItem flock)
{
if (blockDirectory == null)
{
return; // Abort criterion for recursive method.
}
if (flock == null)
{
return;
}
try {
FileLockManager lockMgr = blockDirectory.Filelock;
if (lockMgr == null)
{
return;
}
lock (lockMgr) {
lockMgr.ReleaseBlockDeletePermission(flock);
}
} catch {
return;
}
ReleaseBlockDeletePermission(blockDirectory.Parent, flock); // recursively reset to root for all
}
