bcache: put bch_bio_map() back to correct location in journal_write_unlocked()

Commit a7c50c940477 ("block: pass a block_device and opf to bio_reset")
moves bch_bio_map() inside journal_write_unlocked() next to the location
where the modified bio_reset() was called.

This change is wrong because calling bch_bio_map() immediately after
bio_reset(), a BUG_ON(!bio->bi_iter.bi_size) inside bch_bio_map() will
be triggered and panic the kernel.

This patch puts bch_bio_map() back to its original correct location in
journal_write_unlocked() and avoid the BUG_ON().

Fixes: a7c50c940477 ("block: pass a block_device and opf to bio_reset")
Signed-off-by: Coly Li <colyli@suse.de>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Chaitanya Kulkarni <kch@nvidia.com>
Link: https://lore.kernel.org/r/20220419160425.4148-2-colyli@suse.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/drivers/md/bcache/journal.c b/drivers/md/bcache/journal.c
index 7c2ca52..df5347e 100644 (file)
--- a/drivers/md/bcache/journal.c
+++ b/drivers/md/bcache/journal.c
@@ -771,12 +771,12 @@ static void journal_write_unlocked(struct closure *cl)
 
                bio_reset(bio, ca->bdev, REQ_OP_WRITE | 
                          REQ_SYNC | REQ_META | REQ_PREFLUSH | REQ_FUA);
-               bch_bio_map(bio, w->data);
                bio->bi_iter.bi_sector  = PTR_OFFSET(k, i);
                bio->bi_iter.bi_size = sectors << 9;
 
                bio->bi_end_io  = journal_write_endio;
                bio->bi_private = w;
+               bch_bio_map(bio, w->data);
 
                trace_bcache_journal_write(bio, w->data->keys);
                bio_list_add(&list, bio);