brd: warn on un-aligned buffer
authorMing Lei <ming.lei@redhat.com>
Wed, 4 Dec 2019 11:31:15 +0000 (19:31 +0800)
committerJens Axboe <axboe@kernel.dk>
Wed, 4 Dec 2019 16:04:26 +0000 (09:04 -0700)
commitf1acbf2186dfe761a05ce35c0f36246caed44403
treefd7aa83908a5910608eb56fa9d9a8a134af49c07
parent36582a5a456100ebe4983e3d63b8cbc7e62a0ddc
brd: warn on un-aligned buffer

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>
drivers/block/brd.c