From: Bart Van Assche <bvanassche@acm.org>
To: Douglas Gilbert <dgilbert@interlog.com>, linux-scsi@vger.kernel.org
Cc: martin.petersen@oracle.com, jejb@linux.vnet.ibm.com,
hare@suse.de, Christoph Hellwig <hch@lst.de>
Subject: Re: [PATCH v6 31/37] sg: add sg_iosubmit_v3 and sg_ioreceive_v3 ioctls
Date: Sun, 12 Jan 2020 16:50:06 -0800 [thread overview]
Message-ID: <b17072fb-e8c3-6425-1876-5c2aa51a1641@acm.org> (raw)
In-Reply-To: <20200112235755.14197-32-dgilbert@interlog.com>
On 2020-01-12 15:57, Douglas Gilbert wrote:
> Add ioctl(SG_IOSUBMIT_V3) and ioctl(SG_IORECEIVE_V3). These ioctls
> are meant to be (almost) drop-in replacements for the write()/read()
> async version 3 interface. They only accept the version 3 interface.
>
> See the webpage at: http://sg.danny.cz/sg/sg_v40.html
> specifically the table in the section titled: "13 SG interface
> support changes".
>
> If sgv3 is a struct sg_io_hdr object, suitably configured, then
> res = write(sg_fd, &sgv3, sizeof(sgv3));
> and
> res = ioctl(sg_fd, SG_IOSUBMIT_V3, &sgv3);
> are equivalent. Dito for read() and ioctl(SG_IORECEIVE_V3).
The Linux kernel already supports several interfaces for submitting I/O
requests asynchronously, e.g. libaio and io_uring. Do we really need yet
another interface for submitting I/O requests? Has it been considered to
add SG I/O support to one of the existing asynchronous I/O request
interfaces?
Thanks,
Bart.
next prev parent reply other threads:[~2020-01-13 0:50 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-12 23:57 [PATCH v6 00/37] sg: add v4 interface Douglas Gilbert
2020-01-12 23:57 ` [PATCH v6 01/37] sg: move functions around Douglas Gilbert
2020-01-12 23:57 ` [PATCH v6 02/37] sg: remove typedefs, type+formatting cleanup Douglas Gilbert
2020-01-12 23:57 ` [PATCH v6 03/37] sg: sg_log and is_enabled Douglas Gilbert
2020-01-12 23:57 ` [PATCH v6 04/37] sg: rework sg_poll(), minor changes Douglas Gilbert
2020-01-12 23:57 ` [PATCH v6 05/37] sg: bitops in sg_device Douglas Gilbert
2020-01-12 23:57 ` [PATCH v6 06/37] sg: make open count an atomic Douglas Gilbert
2020-01-12 23:57 ` [PATCH v6 07/37] sg: move header to uapi section Douglas Gilbert
2020-01-13 5:34 ` kbuild test robot
2020-01-14 9:16 ` Douglas Gilbert
2020-01-12 23:57 ` [PATCH v6 08/37] sg: speed sg_poll and sg_get_num_waiting Douglas Gilbert
2020-01-12 23:57 ` [PATCH v6 09/37] sg: sg_allow_if_err_recovery and renames Douglas Gilbert
2020-01-12 23:57 ` [PATCH v6 10/37] sg: improve naming Douglas Gilbert
2020-01-12 23:57 ` [PATCH v6 11/37] sg: change rwlock to spinlock Douglas Gilbert
2020-01-12 23:57 ` [PATCH v6 12/37] sg: ioctl handling Douglas Gilbert
2020-01-12 23:57 ` [PATCH v6 13/37] sg: split sg_read Douglas Gilbert
2020-01-12 23:57 ` [PATCH v6 14/37] sg: sg_common_write add structure for arguments Douglas Gilbert
2020-01-12 23:57 ` [PATCH v6 15/37] sg: rework sg_vma_fault Douglas Gilbert
2020-01-12 23:57 ` [PATCH v6 16/37] sg: rework sg_mmap Douglas Gilbert
2020-01-12 23:57 ` [PATCH v6 17/37] sg: replace sg_allow_access Douglas Gilbert
2020-01-12 23:57 ` [PATCH v6 18/37] sg: rework scatter gather handling Douglas Gilbert
2020-01-12 23:57 ` [PATCH v6 19/37] sg: introduce request state machine Douglas Gilbert
2020-01-12 23:57 ` [PATCH v6 20/37] sg: sg_find_srp_by_id Douglas Gilbert
2020-01-12 23:57 ` [PATCH v6 21/37] sg: sg_fill_request_element Douglas Gilbert
2020-01-12 23:57 ` [PATCH v6 22/37] sg: printk change %p to %pK Douglas Gilbert
2020-01-12 23:57 ` [PATCH v6 23/37] sg: xarray for fds in device Douglas Gilbert
2020-01-12 23:57 ` [PATCH v6 24/37] sg: xarray for reqs in fd Douglas Gilbert
2020-01-12 23:57 ` [PATCH v6 25/37] sg: replace rq array with lists Douglas Gilbert
2020-01-12 23:57 ` [PATCH v6 26/37] sg: sense buffer rework Douglas Gilbert
2020-01-12 23:57 ` [PATCH v6 27/37] sg: add sg v4 interface support Douglas Gilbert
2020-01-13 8:28 ` kbuild test robot
2020-01-14 10:21 ` Douglas Gilbert
2020-01-12 23:57 ` [PATCH v6 28/37] sg: rework debug info Douglas Gilbert
2020-01-12 23:57 ` [PATCH v6 29/37] sg: add 8 byte SCSI LUN to sg_scsi_id Douglas Gilbert
2020-01-12 23:57 ` [PATCH v6 30/37] sg: expand sg_comm_wr_t Douglas Gilbert
2020-01-12 23:57 ` [PATCH v6 31/37] sg: add sg_iosubmit_v3 and sg_ioreceive_v3 ioctls Douglas Gilbert
2020-01-13 0:50 ` Bart Van Assche [this message]
2020-01-13 10:39 ` Douglas Gilbert
2020-01-12 23:57 ` [PATCH v6 32/37] sg: add some __must_hold macros Douglas Gilbert
2020-01-12 23:57 ` [PATCH v6 33/37] sg: move procfs objects to avoid forward decls Douglas Gilbert
2020-01-12 23:57 ` [PATCH v6 34/37] sg: protect multiple receivers Douglas Gilbert
2020-01-12 23:57 ` [PATCH v6 35/37] sg: first debugfs support Douglas Gilbert
2020-01-12 23:57 ` [PATCH v6 36/37] sg: warn v3 write system call users Douglas Gilbert
2020-01-12 23:57 ` [PATCH v6 37/37] sg: bump version to 4.0.08 Douglas Gilbert
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