stable inclusion
from stable-5.10.67
commit 6930a2a5be5cbb0c202fcfa2773c95bd10a19197
bugzilla: 182619 https://gitee.com/openeuler/kernel/issues/I4EWO7

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=6930a2a5be5cbb0c202fcfa2773c95bd10a19197

--------------------------------

[ Upstream commit 10fc72e4 ]

This is the only code that relies on import_iovec() returning
iter.count on success.
This allows a better interface to import_iovec().
Signed-off-by: NDavid Laight <david.laight@aculab.com>
Signed-off-by: NPavel Begunkov <asml.silence@gmail.com>
Reviewed-by: NPavel Begunkov <asml.silence@gmail.com>
Signed-off-by: NJens Axboe <axboe@kernel.dk>
Signed-off-by: NSasha Levin <sashal@kernel.org>
Signed-off-by: NChen Jun <chenjun102@huawei.com>
Acked-by: NWeilong Chen <chenweilong@huawei.com>
Signed-off-by: NChen Jun <chenjun102@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>