zram: fix synchronous reads

Currently nothing waits for the synchronous reads before accessing the
data.  Switch them to an on-stack bio and submit_bio_wait to make sure the
I/O has actually completed when the work item has been flushed.  This also
removes the call to page_endio that would unlock a page that has never
been locked.

Drop the partial_io/sync flag, as chaining only makes sense for the
asynchronous reads of the entire page.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Christoph Hellwig <[email protected]>
Reviewed-by: Sergey Senozhatsky <[email protected]>
Acked-by: Minchan Kim <[email protected]>
Cc: Jens Axboe <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

0 files changed, 0 insertions, 0 deletions