Hi Steve/Ronnie, I'm seeing a strange problem with deferred close. This is the test that I'm running: 1. mount a share with actime=600 2. open a file in the share so that a handle is opened, and it gets scheduled for deferred close. 3. umount the share. That works. 4. rmmod cifs does not seem to work. It says module cifs is in use. DebugData shows that tcon/ses/connections are all active for the unmounted share. I think I understand why this happens, but need help understanding how to fix this. Each handle open takes a reference on tcon, and also on the superblock. So even when the mount point is umounted, tcon does not get freed. I see that it gets freed when all handles that are deferred for close are actually closed. I tried calling cifs_close_all_deferred_files for the tcon in cifs_umount_begin. I even tried printing a log there. I did not see that getting logged during umount. Does that mean umount_begin is not getting called? Wondering what is the correct way to fix this? Ideally, we should call cifs_close_all_deferred_files as soon as the share is umounted. Which is the first callback in cifs.ko for this. I was assuming that umount_begin is that callback. But my experiments are not seeing that getting called. -- Regards, Shyam
