From: Al Viro <viro@zeniv.linux.org.uk>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Christoph Hellwig <hch@lst.de>,
Johannes Berg <johannes@sipsolutions.net>,
Oliver Giles <ohw.giles@gmail.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Subject: Re: Splicing to/from a tty
Date: Wed, 20 Jan 2021 19:11:16 +0000 [thread overview]
Message-ID: <20210120191116.GC740243@zeniv-ca> (raw)
In-Reply-To: <20210120162608.GB740243@zeniv-ca>
On Wed, Jan 20, 2021 at 04:26:08PM +0000, Al Viro wrote:
> [1] yes, it is possible to have O_APPEND opened pipes - open a FIFO with
> O_APPEND and you've got it. We are not quite consistent in handling
> those - sendfile() to such is rejected, splice() is not.
BTW, according to manpages of splice(2) and sendfile(2), we have
EINVAL [snip] target file is opened in append mode [snip]
and
EINVAL out_fd has the O_APPEND flag set. This is not currently supported by sendfile().
However, splice(2) to FIFO opened with O_APPEND works just fine. So
it doesn't match the manpage either.
Why do we care about O_APPEND on anything without FMODE_PWRITE (including
pipes), anyway? All writes there ignore position, after all...
next prev parent reply other threads:[~2021-01-20 19:12 UTC|newest]
Thread overview: 65+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-16 7:35 Splicing to/from a tty Oliver Giles
2021-01-16 16:46 ` Johannes Berg
2021-01-17 6:12 ` Oliver Giles
2021-01-18 8:53 ` Christoph Hellwig
2021-01-18 8:58 ` Johannes Berg
2021-01-18 19:26 ` Linus Torvalds
2021-01-18 19:45 ` Al Viro
2021-01-18 19:49 ` Linus Torvalds
2021-01-18 19:56 ` Al Viro
2021-01-24 19:11 ` Linus Torvalds
2021-01-25 9:16 ` [PATCH] fs/pipe: allow sendfile() to pipe again Johannes Berg
2021-01-25 10:16 ` Christoph Hellwig
2021-01-25 20:34 ` Linus Torvalds
2021-01-26 6:07 ` Splicing to/from a tty Al Viro
2021-01-26 6:08 ` [PATCH 1/3] do_splice_to(): move the logics for limiting the read length in Al Viro
2021-01-26 6:09 ` [PATCH 2/3] take the guts of file-to-pipe splice into a helper function Al Viro
2021-01-26 6:09 ` [PATCH 3/3] teach sendfile(2) to handle send-to-pipe directly Al Viro
2021-01-26 18:57 ` Linus Torvalds
2021-01-26 19:33 ` Al Viro
2021-01-26 18:49 ` Splicing to/from a tty Linus Torvalds
2021-01-26 19:42 ` Al Viro
2021-01-18 19:34 ` Al Viro
2021-01-18 19:46 ` Linus Torvalds
2021-01-18 19:54 ` Al Viro
2021-01-20 16:26 ` Al Viro
2021-01-20 19:11 ` Al Viro [this message]
2021-01-20 19:27 ` Linus Torvalds
2021-01-20 22:25 ` David Laight
2021-01-20 23:02 ` Al Viro
2021-01-20 23:14 ` Al Viro
2021-01-20 23:40 ` Linus Torvalds
2021-01-21 0:38 ` Al Viro
2021-01-21 1:04 ` Linus Torvalds
2021-01-21 1:45 ` Al Viro
2021-01-21 3:38 ` Linus Torvalds
2021-01-21 6:05 ` Willy Tarreau
2021-01-21 8:04 ` Johannes Berg
2021-01-21 10:08 ` David Laight
2021-01-18 8:16 ` Christoph Hellwig
2021-01-18 19:36 ` Linus Torvalds
2021-01-18 20:24 ` Linus Torvalds
2021-01-18 21:35 ` Linus Torvalds
2021-01-18 21:54 ` Linus Torvalds
2021-01-18 22:03 ` Linus Torvalds
2021-01-18 22:20 ` Linus Torvalds
2021-01-19 1:38 ` Linus Torvalds
2021-01-19 11:53 ` Greg Kroah-Hartman
2021-01-19 16:56 ` Robert Karszniewicz
2021-01-19 17:10 ` Robert Karszniewicz
2021-01-19 22:09 ` Oliver Giles
2021-01-19 17:25 ` Linus Torvalds
2021-01-19 20:24 ` Linus Torvalds
2021-01-19 20:38 ` Christoph Hellwig
2021-01-20 1:25 ` Oliver Giles
2021-01-20 4:44 ` Linus Torvalds
2021-01-20 8:15 ` Oliver Giles
2021-01-21 1:18 ` tty splice branch (was "Re: Splicing to/from a tty") Linus Torvalds
2021-01-21 8:44 ` Greg Kroah-Hartman
2021-01-21 8:50 ` Jiri Slaby
2021-01-21 8:58 ` Jiri Slaby
2021-01-21 17:52 ` Linus Torvalds
2021-01-21 8:58 ` Greg Kroah-Hartman
2021-01-21 17:03 ` Splicing to/from a tty Robert Karszniewicz
2021-01-21 18:43 ` Linus Torvalds
2021-01-19 11:52 ` Greg Kroah-Hartman
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