[LU-14760] short read when aio cross stripe

• Type: Improvement
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.16.0
• Assignee: Dongyang Li
• Reporter: Dongyang Li

Description

short read could happen for aio when:

we are reading cross the stripe

layout lock got cancelled on client before we continue to next stripe in cl_io_loop()

vvp_io_read_start()->can_populate_pages() sees the layout has changed, marks the io needs to be restarted.

ll_file_io_generic failed to restart io as the return code from cl_io_loop() is EIOCBQUEUED.