From: Christoph Hellwig <hch-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
To: Zach Brown <zab-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
Cc: "J. Bruce Fields"
<bfields-uC3wQj2KruNg9hUCZPvPmw@public.gmane.org>,
Anna Schumaker
<Anna.Schumaker-HgOvQuBEEgTQT0dZR+AlfA@public.gmane.org>,
Christoph Hellwig <hch-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>,
Jeff Layton <jlayton-vpEMnDpepFuMZCB2o+C8xQ@public.gmane.org>,
Trond Myklebust
<trond.myklebust-7I+n7zu2hftEKMMhf/gKZA@public.gmane.org>,
Linux Kernel Mailing List
<linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
Linux FS-devel Mailing List
<linux-fsdevel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
linux-btrfs-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
Linux NFS Mailing List
<linux-nfs-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
linux-scsi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: [PATCH RFC 1/3] vfs: add copy_file_range syscall and vfs helper
Date: Tue, 14 Apr 2015 12:23:25 -0700 [thread overview]
Message-ID: <20150414192325.GB20599@infradead.org> (raw)
In-Reply-To: <20150414185408.GC23129-fypN+1c5dIyjpB87vu3CluTW4wlIGRCZ@public.gmane.org>
On Tue, Apr 14, 2015 at 11:54:08AM -0700, Zach Brown wrote:
> Is this relying on btrfs range cloning being atomic? It certainly
> doesn't look atomic. It can modify items across an arbitrarily large
> number of leaf blocks. It can make the changes across multiple
> transactions which could introduce partial modification on reboot after
> crashes. It can fail (the dynamic duo: enomem, eio) and leave the
> desintation partially modified.
I didn't mean atomic in the failure atomic sense, but in the sense of
being atomic vs other writes, similar to how Posix specifies it for
writes vs other writes. Guess I need to express this intent better.
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next prev parent reply other threads:[~2015-04-14 19:23 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-04-10 22:00 [PATCH RFC 0/3] simple copy offloading system call Zach Brown
2015-04-10 22:00 ` [PATCH RFC 1/3] vfs: add copy_file_range syscall and vfs helper Zach Brown
[not found] ` <1428703236-24735-2-git-send-email-zab-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2015-04-10 22:36 ` Trond Myklebust
2015-04-11 0:02 ` Zach Brown
2015-04-11 0:24 ` Trond Myklebust
2015-04-11 13:04 ` Jeff Layton
2015-04-13 16:32 ` Zach Brown
2015-04-14 16:53 ` Christoph Hellwig
2015-04-14 16:58 ` Christoph Hellwig
[not found] ` <20150414165344.GA21421-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
2015-04-14 17:16 ` Anna Schumaker
[not found] ` <552D4B5D.3090904-ZwjVKphTwtPQT0dZR+AlfA@public.gmane.org>
2015-04-14 18:19 ` J. Bruce Fields
[not found] ` <20150414181911.GA2080-uC3wQj2KruNg9hUCZPvPmw@public.gmane.org>
2015-04-14 18:22 ` Zach Brown
[not found] ` <20150414182241.GB23129-fypN+1c5dIyjpB87vu3CluTW4wlIGRCZ@public.gmane.org>
2015-04-14 18:29 ` J. Bruce Fields
[not found] ` <20150414182906.GB2080-uC3wQj2KruNg9hUCZPvPmw@public.gmane.org>
2015-04-14 18:54 ` Zach Brown
[not found] ` <20150414185408.GC23129-fypN+1c5dIyjpB87vu3CluTW4wlIGRCZ@public.gmane.org>
2015-04-14 19:23 ` Christoph Hellwig [this message]
[not found] ` <20150414192325.GB20599-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
2015-04-14 20:04 ` Zach Brown
2015-04-10 23:01 ` Andreas Dilger
2015-04-10 22:00 ` [PATCH RFC 2/3] x86: add sys_copy_file_range to syscall tables Zach Brown
2015-04-10 22:00 ` [PATCH RFC 3/3] btrfs: add .copy_file_range file operation Zach Brown
2015-04-14 17:08 ` Chris Mason
[not found] ` <1428703236-24735-1-git-send-email-zab-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2015-05-06 6:15 ` [PATCH RFC 0/3] simple copy offloading system call Michael Kerrisk
2015-05-07 2:52 ` Andy Lutomirski
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