Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
Btrfs: raid56: fix race between merge_bio and rbio_orig_end_io
Before rbio_orig_end_io() goes to free rbio, rbio may get merged with more bios from other rbios and rbio->bio_list becomes non-empty, in that case, these newly merged bios don't end properly. Once unlock_stripe() is done, rbio->bio_list will not be updated any more and we can call bio_endio() on all queued bios. It should only happen in error-out cases, the normal path of recover and full stripe write have already set RBIO_RMW_LOCKED_BIT to disable merge before doing IO, so rbio_orig_end_io() called by them doesn't have the above issue. Reported-by: Jérôme Carretero <[email protected]> Signed-off-by: Liu Bo <[email protected]> Signed-off-by: David Sterba <[email protected]>
- Loading branch information