[v3,0/3] don't change mempool if in-flight r1bio exists

Message

Xueshi Hu July 19, 2023, 7:09 a.m. UTC

All the r1bio should be freed before raid1_reshape() changes the
mempool. However, freeze_array() doesn't guarantee there's no r1bio,
as some r1bio maybe queued. Also, in raid1_write_request(), 
handle_read_error() and raid_end_bio_io() , kernel shall not 
allow_barrier() before the r1bio is properly handled.

-> v2:
	- fix the problem one by one instead of calling
	blk_mq_freeze_queue() as suggested by Yu Kuai
-> v3:
	- add freeze_array_totally() to replace freeze_array() instead
	  of gave up in raid1_reshape()
	- add a missed fix in raid_end_bio_io()
	- add a small check at the start of raid1_reshape()


Xueshi Hu (3):
  md/raid1: freeze array more strictly when reshape
  md/raid1: don't allow_barrier() before r1bio got freed
  md/raid1: check array size before reshape

 drivers/md/raid1.c | 59 +++++++++++++++++++++++++++++++++++++---------
 1 file changed, 48 insertions(+), 11 deletions(-)