From: Christoph Hellwig <hch@infradead.org>
To: Gao Xiang <hsiangkao@linux.alibaba.com>
Cc: Ming Lei <ming.lei@redhat.com>,
Christoph Hellwig <hch@infradead.org>,
linux-block@vger.kernel.org,
Mikulas Patocka <mpatocka@redhat.com>,
Zhaoyang Huang <zhaoyang.huang@unisoc.com>,
Dave Chinner <dchinner@redhat.com>,
linux-fsdevel@vger.kernel.org, Jens Axboe <axboe@kernel.dk>
Subject: Re: calling into file systems directly from ->queue_rq, was Re: [PATCH V5 0/6] loop: improve loop aio perf by IOCB_NOWAIT
Date: Tue, 25 Nov 2025 03:10:09 -0800 [thread overview]
Message-ID: <aSWOkcLPxuIdshrn@infradead.org> (raw)
In-Reply-To: <4a5ec383-540b-461d-9e53-15593a22a61a@linux.alibaba.com>
On Tue, Nov 25, 2025 at 06:57:15PM +0800, Gao Xiang wrote:
> I've said there is no clear list of which data needs to be
> saved/restored.
>
> FSes can do _anything_. Maybe something in `current` needs
> to be saved, but anything that uses `current`/PID as
> a mapping key also needs to be saved, e.g., arbitrary
>
> `hash_table[current]` or `context_table[current->pid]`.
>
> Again, because not all filesystems allow nesting by design:
> Linux kernel doesn't need block filesystem to be nested.
Yes. Various other PF_ flags also come to mind. Or Kent's
magic fault disabling flag (although with bcachefs gone we can
probably remove that, thinking of it).
next prev parent reply other threads:[~2025-11-25 11:10 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-10-15 11:07 [PATCH V5 0/6] loop: improve loop aio perf by IOCB_NOWAIT Ming Lei
2025-10-15 11:07 ` [PATCH V5 1/6] loop: add helper lo_cmd_nr_bvec() Ming Lei
2025-10-15 15:49 ` Bart Van Assche
2025-10-16 2:19 ` Ming Lei
2025-10-15 11:07 ` [PATCH V5 2/6] loop: add helper lo_rw_aio_prep() Ming Lei
2025-10-15 11:07 ` [PATCH V5 3/6] loop: add lo_submit_rw_aio() Ming Lei
2025-10-15 11:07 ` [PATCH V5 4/6] loop: move command blkcg/memcg initialization into loop_queue_work Ming Lei
2025-10-15 11:07 ` [PATCH V5 5/6] loop: try to handle loop aio command via NOWAIT IO first Ming Lei
2025-10-15 11:07 ` [PATCH V5 6/6] loop: add hint for handling aio via IOCB_NOWAIT Ming Lei
2025-11-18 12:55 ` [PATCH V5 0/6] loop: improve loop aio perf by IOCB_NOWAIT Ming Lei
2025-11-18 15:38 ` Jens Axboe
2025-11-24 6:12 ` calling into file systems directly from ->queue_rq, was " Christoph Hellwig
2025-11-24 9:02 ` Ming Lei
2025-11-24 9:05 ` Christoph Hellwig
2025-11-25 3:00 ` Ming Lei
2025-11-25 3:56 ` Jens Axboe
2025-11-25 7:26 ` Gao Xiang
2025-11-25 9:19 ` Ming Lei
2025-11-25 9:39 ` Gao Xiang
2025-11-25 10:13 ` Gao Xiang
2025-11-25 10:41 ` Ming Lei
2025-11-25 10:57 ` Gao Xiang
2025-11-25 11:10 ` Christoph Hellwig [this message]
2025-11-25 11:48 ` Ming Lei
2025-11-25 11:58 ` Gao Xiang
2025-11-25 12:18 ` Ming Lei
2025-11-25 15:16 ` Gao Xiang
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