From: Christoph Hellwig <hch@infradead.org>
To: Zhang Yi <yi.zhang@huaweicloud.com>
Cc: Christoph Hellwig <hch@infradead.org>,
"Darrick J. Wong" <djwong@kernel.org>,
linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org,
linux-kernel@vger.kernel.org, brauner@kernel.org,
david@fromorbit.com, chandanbabu@kernel.org, tytso@mit.edu,
jack@suse.cz, yi.zhang@huawei.com, chengzhihao1@huawei.com,
yukuai3@huawei.com
Subject: Re: [PATCH v5 4/9] xfs: convert delayed extents to unwritten when zeroing post eof blocks
Date: Fri, 26 Apr 2024 23:59:03 -0700 [thread overview]
Message-ID: <ZiyiNzQ6oY3ZAohg@infradead.org> (raw)
In-Reply-To: <5b6228ce-c553-3387-dfc4-2db78e3bd810@huaweicloud.com>
On Fri, Apr 26, 2024 at 03:18:17PM +0800, Zhang Yi wrote:
> I've had the same idea before, I asked Dave and he explained that Linux
> could leak data beyond EOF page for some cases, e.g. mmap() can write to
> the EOF page beyond EOF without failing, and the data in that EOF page
> could be non-zeroed by mmap(), so the zeroing is still needed now.
>
> OTOH, if we free the delalloc and unwritten blocks beyond EOF blocks, he
> said it could lead to some performance problems and make thinks
> complicated to deal with the trimming of EOF block. Please see [1]
> for details and maybe Dave could explain more.
Oh well. Given that we're full in on the speculative allocations
we might as well deal with it.
next prev parent reply other threads:[~2024-04-27 6:59 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-04-25 13:13 [PATCH v5 0/9] xfs/iomap: fix non-atomic clone operation and don't update size when zeroing range post eof Zhang Yi
2024-04-25 13:13 ` [PATCH v5 1/9] xfs: match lock mode in xfs_buffered_write_iomap_begin() Zhang Yi
2024-04-25 13:13 ` [PATCH v5 2/9] xfs: make the seq argument to xfs_bmapi_convert_delalloc() optional Zhang Yi
2024-04-25 13:13 ` [PATCH v5 3/9] xfs: make xfs_bmapi_convert_delalloc() to allocate the target offset Zhang Yi
2024-04-25 13:13 ` [PATCH v5 4/9] xfs: convert delayed extents to unwritten when zeroing post eof blocks Zhang Yi
2024-04-25 18:29 ` Darrick J. Wong
2024-04-26 6:24 ` Zhang Yi
2024-04-26 6:33 ` Christoph Hellwig
2024-04-26 7:18 ` Zhang Yi
2024-04-27 6:59 ` Christoph Hellwig [this message]
2024-04-28 3:26 ` Zhang Yi
2024-04-29 4:41 ` Christoph Hellwig
2024-04-29 7:11 ` Zhang Yi
2024-04-25 13:13 ` [PATCH v5 5/9] iomap: drop the write failure handles when unsharing and zeroing Zhang Yi
2024-04-25 13:13 ` [PATCH v5 6/9] iomap: don't increase i_size if it's not a write operation Zhang Yi
2024-04-25 13:13 ` [PATCH v5 7/9] iomap: use a new variable to handle the written bytes in iomap_write_iter() Zhang Yi
2024-04-25 13:13 ` [PATCH v5 8/9] iomap: make iomap_write_end() return a boolean Zhang Yi
2024-04-25 13:13 ` [PATCH v5 9/9] iomap: do some small logical cleanup in buffered write Zhang Yi
-- strict thread matches above, loose matches on Subject: below --
2024-03-20 11:05 [PATCH v4 4/9] xfs: convert delayed extents to unwritten when zeroing post eof blocks Zhang Yi
2024-04-23 11:17 ` [PATCH v5 " Zhang Yi
2024-04-25 12:22 ` Christoph Hellwig
2024-04-25 12:32 ` Zhang Yi
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