From: Christoph Hellwig <hch@lst.de>
To: Ming Lei <ming.lei@redhat.com>
Cc: Jens Axboe <axboe@kernel.dk>,
linux-block@vger.kernel.org, Christoph Hellwig <hch@lst.de>
Subject: Re: [PATCH 4/8] loop: cover simple read/write via lo_rw_aio()
Date: Tue, 26 Oct 2021 09:35:44 +0200 [thread overview]
Message-ID: <20211026073544.GC31967@lst.de> (raw)
In-Reply-To: <20211025094437.2837701-5-ming.lei@redhat.com>
> - cmd->iocb.ki_complete = lo_rw_aio_complete;
> - cmd->iocb.ki_flags = IOCB_DIRECT;
> +
> cmd->iocb.ki_ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_NONE, 0);
> + if (!cmd->use_dio) {
> + atomic_set(&cmd->ref, 1);
> + cmd->iocb.ki_flags = 0;
> + cmd->ret = lo_call_backing_rw_iter(file, &cmd->iocb, &iter, rw);
> + lo_rw_aio_do_completion(cmd);
> + return 0;
> + }
I don't think we even need the special casing. If you just use the
AIO path here for buffered I/O it will do the same for you at the
small price of an extra refcount operation.
FYI, this seems to be against a kernel that still has cryptoloop/transfers.
next prev parent reply other threads:[~2021-10-26 7:35 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-25 9:44 [PATCH 0/8] loop: improve dio on backing file Ming Lei
2021-10-25 9:44 ` [PATCH 1/8] loop: move flush_dcache_page to ->complete of request Ming Lei
2021-10-26 7:21 ` Christoph Hellwig
2021-10-25 9:44 ` [PATCH 2/8] loop: remove always true check Ming Lei
2021-10-26 7:31 ` Christoph Hellwig
2021-10-25 9:44 ` [PATCH 3/8] loop: add one helper for submitting IO on backing file Ming Lei
2021-10-25 9:44 ` [PATCH 4/8] loop: cover simple read/write via lo_rw_aio() Ming Lei
2021-10-26 7:35 ` Christoph Hellwig [this message]
2021-10-25 9:44 ` [PATCH 5/8] loop: fallback to buffered IO in case of dio submission Ming Lei
2021-10-26 7:36 ` Christoph Hellwig
2021-10-25 9:44 ` [PATCH 6/8] loop: relax loop dio use condition Ming Lei
2021-10-26 7:37 ` Christoph Hellwig
2021-10-27 0:20 ` kernel test robot
2021-10-25 9:44 ` [PATCH 7/8] loop: remove lo->use_dio Ming Lei
2021-10-25 9:44 ` [RFC PATCH 8/8] loop: use backing dio at default Ming Lei
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