md: multipath: don't hardcopy bio in .make_request path

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[ Upstream commit fafcde3ac1 ]

Inside multipath_make_request(), multipath maps the incoming
bio into low level device's bio, but it is totally wrong to
copy the bio into mapped bio via '*mapped_bio = *bio'. For
example, .__bi_remaining is kept in the copy, especially if
the incoming bio is chained to via bio splitting, so .bi_end_io
can't be called for the mapped bio at all in the completing path
in this kind of situation.

This patch fixes the issue by using clone style.

Cc: stable@vger.kernel.org (v3.14+)
Reported-and-tested-by: Andrea Righi <righi.andrea@gmail.com>
Signed-off-by: Ming Lei <ming.lei@canonical.com>
Signed-off-by: Shaohua Li <shli@fb.com>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>

...

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Ming Lei 2016-03-12 09:29:40 +08:00 • committed by Sasha Levin

parent 1a5aee1aaa

commit 79deb9b280

1 changed files with 3 additions and 1 deletions

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drivers/md/multipath.c

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