From: Andreas Dilger <adilger@dilger.ca>
To: "Theodore Y. Ts'o" <tytso@MIT.EDU>
Cc: Harshad Shirwadkar <harshadshirwadkar@gmail.com>,
linux-ext4@vger.kernel.org
Subject: Re: [PATCH v3 12/13] docs: Add fast commit documentation
Date: Thu, 31 Oct 2019 12:53:10 -0600 [thread overview]
Message-ID: <9DF0D322-3ACC-4094-976B-CF8F4A06F655@dilger.ca> (raw)
In-Reply-To: <20191018132802.GE21137@mit.edu>
[-- Attachment #1: Type: text/plain, Size: 1525 bytes --]
On Oct 18, 2019, at 7:28 AM, Theodore Y. Ts'o <tytso@MIT.EDU> wrote:
>
> On Fri, Oct 18, 2019 at 01:51:56PM +0900, Andreas Dilger wrote:
>> What about rename or hard link?
>
> Neither is currently handled by the fast commit patches, but each
> operation can fit inside a single block, so it could be handled as a
> update to a single inode. In the case of rename, we will need to add
> some tags to indicate the desintation directory and directory enrty
> name, and whether or not there is a destination inode which needs to
> have its refcount dropped and possibly deleted.
>
> Harshad, we probably should handle them, since in order to support
> NFS, the nfs server will send the rename or hard link request,
> followed by a commit metadata request, and that commit metadata
> request needs to persist the rename or link. So for the purposes of
> accelerating NFS, we should handle these commands.
>
> If we don't handle these commands, we will need to declare the inode
> as fast commit ineligible, so that we force a full journal commit when
> the commit metadata request is received.
As a simplifying assumption, you could limit the case of rename/link
within a single directory? That handles the common case of "create
temp file, write contents there, sync, rename over original file"
used by most editors, rsync, etc. The case of cross-directory rename
is much less common in my experience, so it is less important to
optimize that case (if this makes it easier to add to fast commits).
Cheers, Andreas
[-- Attachment #2: Message signed with OpenPGP --]
[-- Type: application/pgp-signature, Size: 873 bytes --]
next prev parent reply other threads:[~2019-10-31 18:53 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-01 7:40 [PATCH v3 00/13] ext4: add fast commit support Harshad Shirwadkar
2019-10-01 7:40 ` [PATCH v3 01/13] ext4: add handling for extended mount options Harshad Shirwadkar
2019-10-16 2:14 ` Theodore Y. Ts'o
2019-10-21 20:41 ` harshad shirwadkar
2019-10-01 7:40 ` [PATCH v3 02/13] jbd2: fast commit setup and enable Harshad Shirwadkar
2019-10-16 13:03 ` Theodore Y. Ts'o
2019-10-01 7:40 ` [PATCH v3 03/13] jbd2: fast-commit commit path changes Harshad Shirwadkar
2019-10-16 16:38 ` Theodore Y. Ts'o
2019-10-01 7:40 ` [PATCH v3 04/13] jbd2: fast-commit commit path new APIs Harshad Shirwadkar
2019-10-16 17:20 ` Theodore Y. Ts'o
2019-10-01 7:40 ` [PATCH v3 05/13] jbd2: fast-commit recovery path changes Harshad Shirwadkar
2019-10-16 17:30 ` Theodore Y. Ts'o
2019-10-22 0:51 ` harshad shirwadkar
2019-10-01 7:40 ` [PATCH v3 06/13] ext4: add fields that are needed to track changed files Harshad Shirwadkar
2019-10-16 18:26 ` Theodore Y. Ts'o
2019-10-01 7:40 ` [PATCH v3 07/13] ext4: track changed files for fast commit Harshad Shirwadkar
2019-10-16 20:26 ` Theodore Y. Ts'o
2019-10-01 7:40 ` [PATCH v3 08/13] ext4: fast-commit commit range tracking Harshad Shirwadkar
2019-10-16 21:36 ` Theodore Y. Ts'o
2019-10-30 5:12 ` harshad shirwadkar
2019-10-01 7:40 ` [PATCH v3 09/13] ext4: fast-commit commit path changes Harshad Shirwadkar
2019-10-16 22:45 ` Theodore Y. Ts'o
[not found] ` <CAAJeciXQiE022GqcsTr35jSqjA6eH+zBS2KNvDPj5PovButdYA@mail.gmail.com>
2019-10-23 12:44 ` Theodore Y. Ts'o
2019-10-01 7:40 ` [PATCH v3 10/13] ext4: fast-commit recovery " Harshad Shirwadkar
2019-10-18 2:07 ` Theodore Y. Ts'o
2019-10-01 7:41 ` [PATCH v3 11/13] ext4: add support for asynchronous fast commits Harshad Shirwadkar
2019-10-25 6:28 ` Xiaoguang Wang
2019-10-01 7:41 ` [PATCH v3 12/13] docs: Add fast commit documentation Harshad Shirwadkar
2019-10-18 1:56 ` Theodore Y. Ts'o
2019-10-18 4:51 ` Andreas Dilger
2019-10-18 13:28 ` Theodore Y. Ts'o
2019-10-31 18:53 ` Andreas Dilger [this message]
2019-10-31 5:34 ` harshad shirwadkar
2019-10-31 6:41 ` harshad shirwadkar
2019-10-04 19:12 ` [PATCH v3 00/13] ext4: add fast commit support Theodore Y. Ts'o
2019-10-04 20:11 ` harshad shirwadkar
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=9DF0D322-3ACC-4094-976B-CF8F4A06F655@dilger.ca \
--to=adilger@dilger.ca \
--cc=harshadshirwadkar@gmail.com \
--cc=linux-ext4@vger.kernel.org \
--cc=tytso@MIT.EDU \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).