Matthew Ahrens 1f043c8be1 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 30af21b025 (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. Reviewed-by: Ryan Moeller <ryan@iXsystems.com> Reviewed-by: Chris Wedgwood <cw@f00f.org> Reviewed-by: Paul Dagnelie <pcd@delphix.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Matthew Ahrens <mahrens@delphix.com> Closes #10215 Closes #10216		2020-04-20 10:12:48 -07:00
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rpc	OpenZFS restructuring - move platform specific headers	2019-09-05 09:34:54 -07:00
sys	Fix zfs send progress reporting	2020-04-20 10:12:48 -07:00
Makefile.am	OpenZFS restructuring - move platform specific headers	2019-09-05 09:34:54 -07:00