When does the dokanloop thread exit

[zqlustc]

I have build the dokan environment. But I met the following problem.

thread A:
-> call the mount

thread B:
mount thread start: ( It's the detached thread of thread A)
  ->fuse_loop_mt (it's a detached thread from my service)
    -> ...
      -> DokanMian
         -> dokanLoop(now is 10 child threads)
         -> WaitForMultipleObjects(will wait for child threads return, )
         -> ...... (release source)

-> call the umount: (it's not ok)
Now I umount the fuse through calling in main thread
-> fuse_exit
-> fuse_teardown
But the thread B is abruptly killed, and will not release source.

I want to know:
(1) What might cause DokanMain(thread B) to terminate suddenly;
(2) Under what circumstances will this dokanLoop threads end normally;
@Liryna

[Liryna]

fuse_exit will trigger an unmount which releases the thread B from the fuse_loop and call fuse_teardown that releases the dokan attached resources.

dokany/dokan_fuse/src/dokanfuse.cpp

Lines 810 to 815 in 5a43c6c

	if (multithreaded)
	res = fuse_loop_mt(fuse);
	else
	res = fuse_loop(fuse);
	fuse_teardown(fuse, mountpoint);

Thread B is never abruptly killed or terminate suddenly. It will leave the loop and follow the path described.

[zqlustc]

I am reading the umount code in dokan, a question troblems me.

BOOL DOKANAPI DokanUnmount(WCHAR DriveLetter) {
  WCHAR mountPoint[MAX_PATH] = L"M:";
  mountPoint[0] = DriveLetter;
  return DokanRemoveMountPoint(mountPoint);
}

My mount path is like: D:\DOKAN\DIR，but the mountPoint passed to DokanRemoveMountPoint D:, is that right? And the umount always failed like:

DokanError: Ioctl failed with code 122
Failed to unmount: D:

It confuses me

[Liryna]

Normally fuse_unmount will call DokanRemoveMountPoint and not DokanUnmount

[zqlustc]

I use the fuse_exit to trigger an unmount which releases the thread B from the fuse_loop.

-> fuse_exit
  -> f->ch->ResolvedDokanUnmount(f->ch->mountpoint.at(0))
    -> DokanUnmount
      -> DokanRemoveMountPoint(mountPoint)
        -> SendGlobalReleaseIRP
error:
  DokanError: Ioctl failed with code 122
  Failed to unmount: D:

I want to release the thread B from the fuse_loop, But failed, but it always failed. fuse_exit will call the DokanUnmount firstly. My mount path is a dir D:\DOKAN\DIR in disk D:, not the D:

[Liryna]

That's a good point!
I made a change that should solve your case de4c04c

Thank you for your feedback. Let me know if that fully solve your issue.

[zqlustc]

Too great, it could solve my problem with following changes together.

@@ -785,7 +804,7 @@ void fuse_teardown(struct fuse *fuse, char *mountpoint) {
...
-  fuse_unmount(mountpoint, ch);
+ // fuse_unmount(mountpoint, ch);
...
 }

Thanks very much!!!