Commits on Apr 17, 2020

1. fix zfs send progress reporting …

   The progress of a send is supposed to be reported by `zfs send -v`, but
   it is not.  This works by creating a new user thread (with
   pthread_create()) which does ZFS_IOC_SEND_PROGRESS ioctls to check how
   much progress has been made.  This IOCTL finds the specified send (since
   there may be multiple concurrent sends in the system).  The IOCTL also
   checks that the specified send was started by the current process.
   
   On Linux, different threads of the same process are represented as
   different `struct task_struct`s (and, confusingly, have different
   PID's).  To check if if two threads are in the same process, we need to
   check if they have the same `struct task_struct:group_leader`.
   
   We used to to this correctly, but it was inadvertently changed by
   30af21b (Redacted Send) to simply check if the current
   `struct task_struct` is the one that started the send.
   
   This commit changes the code back to checking if the send was started by
   a `struct task_struct` with the same `group_leader` as the calling
   thread.
   
   Signed-off-by: Matthew Ahrens <mahrens@delphix.com>
   Closes openzfs#10215

   

   ahrens committed Apr 17, 2020
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