block: add a error_count field to struct request

This is for the legacy floppy and ataflop drivers that currently abuse
->errors for this purpose.  It's stashed away in a union to not grow
the struct size, the other fields are either used by modern drivers
for different purposes or the I/O scheduler before queing the I/O
to drivers.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index e2064ed3c7038f7b4270d9db96b64ef234b7d6ab..a3dcee624de3072261d1deb87bf12ca2d7ac8b74 100644 (file)
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -175,6 +175,7 @@ struct request {
                struct rb_node rb_node; /* sort/lookup */
                struct bio_vec special_vec;
                void *completion_data;
+               int error_count; /* for legacy drivers, don't use */
        };
 
        /*