tree fca6bcc907a272cd72bf952778467a5ad4428a6a
parent fa8410b355251fd30341662a40ac6b22d3e38468
author Miklos Szeredi <mszeredi@redhat.com> 1472055424 +0200
committer Miklos Szeredi <mszeredi@redhat.com> 1472055424 +0200

fuse: direct-io: don't dirty ITER_BVEC pages

When reading from a loop device backed by a fuse file it deadlocks on
lock_page().

This is because the page is already locked by the read() operation done on
the loop device.  In this case we don't want to either lock the page or
dirty it.

So do what fs/direct-io.c does: only dirty the page for ITER_IOVEC vectors.

Reported-by: Sheng Yang <sheng@yasker.org>
Fixes: aa4d86163e4e ("block: loop: switch to VFS ITER_BVEC")
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Cc: <stable@vger.kernel.org> # v4.1+
Reviewed-by: Sheng Yang <sheng@yasker.org>
Reviewed-by: Ashish Samant <ashish.samant@oracle.com>
Tested-by: Sheng Yang <sheng@yasker.org>
Tested-by: Ashish Samant <ashish.samant@oracle.com>