After file move, filter unregister failed

[tohosys]

Dear @slavaim,

After some mv operations in filtetring area, we can not unregister filter module with msg of "Device or resource busy".

OS:

• CentOS 6 or 7

Test:

1. rfsctl -f mvflt -i /test1
2. mv /test1/file1 /test1/file2
3. rfsctl -f mvflt -c
4. echo -n "1" > /sys/fs/redirfs/filters/mvflt/unregister bash: echo: write error: Device or resource busy

Cause:

• counter mismatch error at following line on "redirfs_unregister_filter" function: -- if (atomic_read(&rflt->count) != 3) {

Would you please give me some solution?

Thanks.