From: "Darrick J. Wong" <darrick.wong@oracle.com>
To: Chandan Babu R <chandanrlinux@gmail.com>
Cc: Christoph Hellwig <hch@infradead.org>,
linux-xfs@vger.kernel.org, david@fromorbit.com
Subject: Re: [PATCH V6 08/11] xfs: Check for extent overflow when remapping an extent
Date: Fri, 16 Oct 2020 08:29:00 -0700 [thread overview]
Message-ID: <20201016152900.GD9832@magnolia> (raw)
In-Reply-To: <1899682.3A2Fs4cuYb@garuda>
On Fri, Oct 16, 2020 at 04:58:53PM +0530, Chandan Babu R wrote:
> On Friday 16 October 2020 12:34:48 PM IST Christoph Hellwig wrote:
> > On Thu, Oct 15, 2020 at 03:31:26PM +0530, Chandan Babu R wrote:
> > > How about following the traits of XFS_IEXT_WRITE_UNWRITTEN_CNT (writing
> > > to unwritten extent) and XFS_IEXT_REFLINK_END_COW_CNT (moving an extent
> > > from cow fork to data fork) and setting XFS_IEXT_REFLINK_REMAP_CNT to a
> > > worst case value of 2? A write spanning the entirety of an unwritten extent
> > > does not change the extent count. Similarly, If there are no extents in the
> > > data fork spanning the file range mapped by an extent in the cow
> > > fork, moving the extent from cow fork to data fork increases the extent count
> > > by just 1 and not by the worst case count of 2.
> >
> > No, I think the dynamic value is perfectly fine, as we have all the
> > information trivially available. I just don't think having a separate
> > macro and the comment explaining it away from the actual functionality
> > is helpful.
> >
>
> Darrick, I think using the macros approach is more suitable. But I can go
> ahead and implement the approach decided by the community. Please let me know
> your opinion.
The macro only gets used in one place anyway, so I don't see as strong a
need for it as the other places. I think this one could be open-coded
next to the places where we decide the values of smap_real and
dmap_written. (i.e. what Christoph is suggesting)
--D
> --
> chandan
>
>
>
next prev parent reply other threads:[~2020-10-16 15:31 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-12 9:29 [PATCH V6 00/11] Bail out if transaction can cause extent count to overflow Chandan Babu R
2020-10-12 9:29 ` [PATCH V6 01/11] xfs: Add helper for checking per-inode extent count overflow Chandan Babu R
2020-10-15 8:34 ` Christoph Hellwig
2020-10-12 9:29 ` [PATCH V6 02/11] xfs: Check for extent overflow when trivally adding a new extent Chandan Babu R
2020-10-15 8:34 ` Christoph Hellwig
2020-10-12 9:29 ` [PATCH V6 03/11] xfs: Check for extent overflow when punching a hole Chandan Babu R
2020-10-15 8:35 ` Christoph Hellwig
2020-10-12 9:29 ` [PATCH V6 04/11] xfs: Check for extent overflow when adding/removing xattrs Chandan Babu R
2020-10-15 8:36 ` Christoph Hellwig
2020-10-12 9:29 ` [PATCH V6 05/11] xfs: Check for extent overflow when adding/removing dir entries Chandan Babu R
2020-10-15 8:36 ` Christoph Hellwig
2020-10-12 9:29 ` [PATCH V6 06/11] xfs: Check for extent overflow when writing to unwritten extent Chandan Babu R
2020-10-15 8:36 ` Christoph Hellwig
2020-10-12 9:29 ` [PATCH V6 07/11] xfs: Check for extent overflow when moving extent from cow to data fork Chandan Babu R
2020-10-15 8:37 ` Christoph Hellwig
2020-10-12 9:29 ` [PATCH V6 08/11] xfs: Check for extent overflow when remapping an extent Chandan Babu R
2020-10-15 8:39 ` Christoph Hellwig
2020-10-15 10:01 ` Chandan Babu R
2020-10-15 18:45 ` Darrick J. Wong
2020-10-16 4:27 ` Chandan Babu R
2020-10-16 7:04 ` Christoph Hellwig
2020-10-16 11:28 ` Chandan Babu R
2020-10-16 15:29 ` Darrick J. Wong [this message]
2020-10-17 2:55 ` Chandan Babu R
2020-10-12 9:29 ` [PATCH V6 09/11] xfs: Check for extent overflow when swapping extents Chandan Babu R
2020-10-12 9:29 ` [PATCH V6 10/11] xfs: Introduce error injection to reduce maximum inode fork extent count Chandan Babu R
2020-10-15 8:40 ` Christoph Hellwig
2020-10-12 9:29 ` [PATCH V6 11/11] xfs: Introduce error injection to allocate only minlen size extents for files Chandan Babu R
2020-10-15 8:41 ` Christoph Hellwig
2020-10-15 10:02 ` Chandan Babu R
2020-10-15 18:41 ` Darrick J. Wong
2020-10-16 11:31 ` Chandan Babu R
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