Re: [RFC PATCH 11/10] pipe: Add fsync() support [ver #2]

[RFC PATCH 00/10] pipe: Notification queue preparation [ver #2] · David Howells <dhowells@redhat.com> · 2019-10-23
[RFC PATCH 01/10] pipe: Reduce #inclusion of pipe_fs_i.h [ver #2] · David Howells <dhowells@redhat.com> · 2019-10-23
[RFC PATCH 02/10] Remove the nr_exclusive argument from __wake_up_sync_key() [ver #2] · David Howells <dhowells@redhat.com> · 2019-10-23
[RFC PATCH 03/10] Add wake_up_interruptible_sync_poll_locked() [ver #2] · David Howells <dhowells@redhat.com> · 2019-10-23
[RFC PATCH 04/10] pipe: Use head and tail pointers for the ring, not cursor and length [ver #2] · David Howells <dhowells@redhat.com> · 2019-10-23
Re: [RFC PATCH 04/10] pipe: Use head and tail pointers for the ring, not cursor and length [ver #2] · David Howells <dhowells@redhat.com> · 2019-10-24
Re: [RFC PATCH 04/10] pipe: Use head and tail pointers for the ring, not cursor and length [ver #2] · Linus Torvalds <torvalds@linux-foundation.org> · 2019-10-27
Re: [RFC PATCH 04/10] pipe: Use head and tail pointers for the ring, not cursor and length [ver #2] · David Howells <dhowells@redhat.com> · 2019-10-31
Re: [RFC PATCH 04/10] pipe: Use head and tail pointers for the ring, not cursor and length [ver #2] · Matthew Wilcox <willy@infradead.org> · 2019-11-03
Re: [RFC PATCH 04/10] pipe: Use head and tail pointers for the ring, not cursor and length [ver #2] · Ilya Dryomov <idryomov@gmail.com> · 2019-10-30
Re: [RFC PATCH 04/10] pipe: Use head and tail pointers for the ring, not cursor and length [ver #2] · Rasmus Villemoes <linux@rasmusvillemoes.dk> · 2019-10-30
Re: [RFC PATCH 04/10] pipe: Use head and tail pointers for the ring, not cursor and length [ver #2] · Ilya Dryomov <idryomov@gmail.com> · 2019-10-30
Re: [RFC PATCH 04/10] pipe: Use head and tail pointers for the ring, not cursor and length [ver #2] · Rasmus Villemoes <linux@rasmusvillemoes.dk> · 2019-10-30
Re: [RFC PATCH 04/10] pipe: Use head and tail pointers for the ring, not cursor and length [ver #2] · David Howells <dhowells@redhat.com> · 2019-10-31
Re: [RFC PATCH 04/10] pipe: Use head and tail pointers for the ring, not cursor and length [ver #2] · Ilya Dryomov <idryomov@gmail.com> · 2019-10-31
Re: [RFC PATCH 04/10] pipe: Use head and tail pointers for the ring, not cursor and length [ver #2] · David Howells <dhowells@redhat.com> · 2019-11-01
Re: [RFC PATCH 04/10] pipe: Use head and tail pointers for the ring, not cursor and length [ver #2] · Johannes Hirte <hidden> · 2019-12-06
Re: [RFC PATCH 04/10] pipe: Use head and tail pointers for the ring, not cursor and length [ver #2] · Linus Torvalds <torvalds@linux-foundation.org> · 2019-12-06
Re: [RFC PATCH 04/10] pipe: Use head and tail pointers for the ring, not cursor and length [ver #2] · Johannes Hirte <hidden> · 2019-12-07
Re: [RFC PATCH 04/10] pipe: Use head and tail pointers for the ring, not cursor and length [ver #2] · Linus Torvalds <torvalds@linux-foundation.org> · 2019-12-07
Re: [RFC PATCH 04/10] pipe: Use head and tail pointers for the ring, not cursor and length [ver #2] · Johannes Hirte <hidden> · 2019-12-08
Re: [RFC PATCH 04/10] pipe: Use head and tail pointers for the ring, not cursor and length [ver #2] · Linus Torvalds <torvalds@linux-foundation.org> · 2019-12-08
Re: [RFC PATCH 04/10] pipe: Use head and tail pointers for the ring, not cursor and length [ver #2] · Linus Torvalds <torvalds@linux-foundation.org> · 2019-12-07
Re: [RFC PATCH 04/10] pipe: Use head and tail pointers for the ring, not cursor and length [ver #2] · David Howells <dhowells@redhat.com> · 2019-12-06
[RFC PATCH 05/10] pipe: Allow pipes to have kernel-reserved slots [ver #2] · David Howells <dhowells@redhat.com> · 2019-10-23
[RFC PATCH 06/10] pipe: Advance tail pointer inside of wait spinlock in pipe_read() [ver #2] · David Howells <dhowells@redhat.com> · 2019-10-23
[RFC PATCH 07/10] pipe: Conditionalise wakeup in pipe_read() [ver #2] · David Howells <dhowells@redhat.com> · 2019-10-23
Re: [RFC PATCH 07/10] pipe: Conditionalise wakeup in pipe_read() [ver #2] · Konstantin Khlebnikov <hidden> · 2019-10-27
Re: [RFC PATCH 07/10] pipe: Conditionalise wakeup in pipe_read() [ver #2] · David Howells <dhowells@redhat.com> · 2019-10-31
Re: [RFC PATCH 07/10] pipe: Conditionalise wakeup in pipe_read() [ver #2] · David Howells <dhowells@redhat.com> · 2019-10-31
Re: [RFC PATCH 07/10] pipe: Conditionalise wakeup in pipe_read() [ver #2] · Konstantin Khlebnikov <hidden> · 2019-11-03
[RFC PATCH 08/10] pipe: Rearrange sequence in pipe_write() to preallocate slot [ver #2] · David Howells <dhowells@redhat.com> · 2019-10-23
[RFC PATCH 09/10] pipe: Remove redundant wakeup from pipe_write() [ver #2] · David Howells <dhowells@redhat.com> · 2019-10-23
[RFC PATCH 10/10] pipe: Check for ring full inside of the spinlock in pipe_write() [ver #2] · David Howells <dhowells@redhat.com> · 2019-10-23
Re: [RFC PATCH 00/10] pipe: Notification queue preparation [ver #2] · Peter Zijlstra <peterz@infradead.org> · 2019-10-24
[RFC PATCH 11/10] pipe: Add fsync() support [ver #2] · David Howells <dhowells@redhat.com> · 2019-10-24
Re: [RFC PATCH 11/10] pipe: Add fsync() support [ver #2] · Linus Torvalds <torvalds@linux-foundation.org> · 2019-10-24
Re: [RFC PATCH 11/10] pipe: Add fsync() support [ver #2] · David Howells <dhowells@redhat.com> · 2019-10-25
Re: [RFC PATCH 11/10] pipe: Add fsync() support [ver #2] · Christoph Hellwig <hch@infradead.org> · 2019-10-27
Re: [RFC PATCH 11/10] pipe: Add fsync() support [ver #2] · David Howells <dhowells@redhat.com> · 2019-10-31
Re: [RFC PATCH 11/10] pipe: Add fsync() support [ver #2] · Konstantin Khlebnikov <hidden> · 2019-10-27
Re: [RFC PATCH 11/10] pipe: Add fsync() support [ver #2] · David Howells <dhowells@redhat.com> · 2019-10-31
Re: [RFC PATCH 11/10] pipe: Add fsync() support [ver #2] · Linus Torvalds <torvalds@linux-foundation.org> · 2019-11-02
Re: [RFC PATCH 11/10] pipe: Add fsync() support [ver #2] · David Howells <dhowells@redhat.com> · 2019-11-02
Re: [RFC PATCH 11/10] pipe: Add fsync() support [ver #2] · Andy Lutomirski <luto@amacapital.net> · 2019-11-02
Re: [RFC PATCH 11/10] pipe: Add fsync() support [ver #2] · Linus Torvalds <torvalds@linux-foundation.org> · 2019-11-02
Re: [RFC PATCH 11/10] pipe: Add fsync() support [ver #2] · Linus Torvalds <torvalds@linux-foundation.org> · 2019-11-02
Re: [RFC PATCH 11/10] pipe: Add fsync() support [ver #2] · Andy Lutomirski <luto@amacapital.net> · 2019-11-02
Re: [RFC PATCH 11/10] pipe: Add fsync() support [ver #2] · Linus Torvalds <torvalds@linux-foundation.org> · 2019-11-02
Re: [RFC PATCH 11/10] pipe: Add fsync() support [ver #2] · Linus Torvalds <torvalds@linux-foundation.org> · 2019-11-02
Re: [RFC PATCH 11/10] pipe: Add fsync() support [ver #2] · Andy Lutomirski <luto@kernel.org> · 2019-11-02
Re: [RFC PATCH 11/10] pipe: Add fsync() support [ver #2] · Konstantin Khlebnikov <hidden> · 2019-11-03

From: David Howells <dhowells@redhat.com>
Date: 2019-11-02 19:34:46
Also in: keyrings, linux-api, linux-block, linux-fsdevel, linux-usb, lkml

Linus Torvalds [off-list ref] wrote:

quoted

Similar synchronization is required for reusing memory after vmsplice()?
I don't see other way how sender could safely change these pages.

Actually, it's probably worse than that.  If the output of the pipe gets teed
or spliced somewhere else, you still don't know when the vmspliced pages are
finished with.

David

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