Queue dma alignment limit requires users(fs, target, ...) of block layer
to pass aligned buffer.
So far brd doesn't support un-aligned buffer, even though it is easy
to support it.
However, given brd is often used for debug purpose, and there are other
drivers which can't support un-aligned buffer too.
So add warning so that brd users know what to fix.
Reported-by: Stephen Rust <srust@blockbridge.com>
Cc: Stephen Rust <srust@blockbridge.com>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
unsigned int len = bvec.bv_len;
int err;
+ /* Don't support un-aligned buffer */
+ WARN_ON_ONCE((bvec.bv_offset & (SECTOR_SIZE - 1)) ||
+ (len & (SECTOR_SIZE - 1)));
+
err = brd_do_bvec(brd, bvec.bv_page, len, bvec.bv_offset,
bio_op(bio), sector);
if (err)