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From: Christoph Hellwig <hch@infradead.org>
To: Matthew Wilcox <willy@infradead.org>
Cc: Andreas Gr?nbacher <andreas.gruenbacher@gmail.com>,
	Christoph Hellwig <hch@infradead.org>,
	linux-erofs@lists.ozlabs.org,
	Linux FS-devel Mailing List <linux-fsdevel@vger.kernel.org>,
	LKML <linux-kernel@vger.kernel.org>,
	"Darrick J. Wong" <djwong@kernel.org>, Chao Yu <chao@kernel.org>,
	Liu Bo <bo.liu@linux.alibaba.com>,
	Joseph Qi <joseph.qi@linux.alibaba.com>,
	Liu Jiang <gerry@linux.alibaba.com>
Subject: Re: [PATCH 1/2] iomap: support tail packing inline read
Date: Mon, 19 Jul 2021 12:19:34 +0100	[thread overview]
Message-ID: <YPVfxn6/oCPBZpKu@infradead.org> (raw)
In-Reply-To: <YPMkKfegS+9KzEhK@casper.infradead.org>

On Sat, Jul 17, 2021 at 07:40:41PM +0100, Matthew Wilcox wrote:
> Well, either sense of a WARN_ON is wrong.
> 
> For a file which is PAGE_SIZE + 3 bytes in size, to_iomap_page() will
> be NULL.  For a file which is PAGE_SIZE/2 + 3 bytes in size,
> to_iomap_page() will not be NULL.  (assuming the block size is <=
> PAGE_SIZE / 2).
> 
> I think we need a prep patch that looks something like this:

Something like this is where we should eventually end up, but it
also affects the read from disk case so we need to be careful.

WARNING: multiple messages have this Message-ID
From: Christoph Hellwig <hch@infradead.org>
To: Matthew Wilcox <willy@infradead.org>
Cc: "Darrick J. Wong" <djwong@kernel.org>,
	Andreas Gr?nbacher <andreas.gruenbacher@gmail.com>,
	LKML <linux-kernel@vger.kernel.org>,
	Christoph Hellwig <hch@infradead.org>,
	Joseph Qi <joseph.qi@linux.alibaba.com>,
	Liu Bo <bo.liu@linux.alibaba.com>,
	Linux FS-devel Mailing List <linux-fsdevel@vger.kernel.org>,
	Liu Jiang <gerry@linux.alibaba.com>,
	linux-erofs@lists.ozlabs.org
Subject: Re: [PATCH 1/2] iomap: support tail packing inline read
Date: Mon, 19 Jul 2021 12:19:34 +0100	[thread overview]
Message-ID: <YPVfxn6/oCPBZpKu@infradead.org> (raw)
In-Reply-To: <YPMkKfegS+9KzEhK@casper.infradead.org>

On Sat, Jul 17, 2021 at 07:40:41PM +0100, Matthew Wilcox wrote:
> Well, either sense of a WARN_ON is wrong.
> 
> For a file which is PAGE_SIZE + 3 bytes in size, to_iomap_page() will
> be NULL.  For a file which is PAGE_SIZE/2 + 3 bytes in size,
> to_iomap_page() will not be NULL.  (assuming the block size is <=
> PAGE_SIZE / 2).
> 
> I think we need a prep patch that looks something like this:

Something like this is where we should eventually end up, but it
also affects the read from disk case so we need to be careful.

  reply	other threads:[~2021-07-19 11:22 UTC|newest]

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-16  5:07 [PATCH 0/2] erofs: iomap support for tailpacking cases Gao Xiang
2021-07-16  5:07 ` Gao Xiang
2021-07-16  5:07 ` [PATCH 1/2] iomap: support tail packing inline read Gao Xiang
2021-07-16  5:07   ` Gao Xiang
2021-07-16  9:19   ` Christoph Hellwig
2021-07-16  9:19     ` Christoph Hellwig
2021-07-16  9:46     ` Gao Xiang
2021-07-16  9:46       ` Gao Xiang
2021-07-16 13:47     ` Matthew Wilcox
2021-07-16 13:47       ` Matthew Wilcox
2021-07-16 14:38       ` Matthew Wilcox
2021-07-16 14:38         ` Matthew Wilcox
2021-07-16 13:02   ` Matthew Wilcox
2021-07-16 13:02     ` Matthew Wilcox
2021-07-16 13:56     ` Gao Xiang
2021-07-16 13:56       ` Gao Xiang
2021-07-16 14:44       ` Matthew Wilcox
2021-07-16 15:03         ` Gao Xiang
2021-07-16 15:03           ` Gao Xiang
2021-07-16 15:53           ` Andreas Grünbacher
2021-07-16 15:53             ` Andreas Grünbacher
2021-07-17 13:38             ` Gao Xiang
2021-07-17 13:38               ` Gao Xiang
2021-07-17 15:01               ` Matthew Wilcox
2021-07-17 15:15                 ` Gao Xiang
2021-07-17 15:15                   ` Gao Xiang
2021-07-17 18:40                   ` Matthew Wilcox
2021-07-19 11:19                     ` Christoph Hellwig [this message]
2021-07-19 11:19                       ` Christoph Hellwig
2021-07-19 13:45                       ` Gao Xiang
2021-07-19 13:45                         ` Gao Xiang
2021-07-19 11:15               ` Christoph Hellwig
2021-07-19 13:31                 ` Gao Xiang
2021-07-19 13:31                   ` Gao Xiang
2021-07-16  5:07 ` [PATCH 2/2] erofs: convert all uncompressed cases to iomap Gao Xiang
2021-07-16  5:07   ` Gao Xiang

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