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From: Matthew Wilcox <willy@infradead.org>
To: "Darrick J. Wong" <darrick.wong@oracle.com>
Cc: linux-fsdevel@vger.kernel.org, linux-xfs@vger.kernel.org,
	linux-mm@kvack.org
Subject: Re: [PATCH 09/14] iomap: Change iomap_write_begin calling convention
Date: Wed, 14 Oct 2020 18:41:58 +0100
Message-ID: <20201014174158.GS20115@casper.infradead.org> (raw)
In-Reply-To: <20201014164744.GK9832@magnolia>

On Wed, Oct 14, 2020 at 09:47:44AM -0700, Darrick J. Wong wrote:
> > -static int
> > -iomap_write_begin(struct inode *inode, loff_t pos, unsigned len, unsigned flags,
> > -		struct page **pagep, struct iomap *iomap, struct iomap *srcmap)
> > +static ssize_t iomap_write_begin(struct inode *inode, loff_t pos, loff_t len,
> > +		unsigned flags, struct page **pagep, struct iomap *iomap,
> 
> loff_t len?  You've been using size_t (ssize_t?) for length elsewhere,
> can't return more than ssize_t, and afaik MAX_RW_COUNT will never go
> larger than 2GB so I'm confused about types here...?

Yes, you're right.  This one should be size_t.

> >  	if (page_ops && page_ops->page_prepare) {
> > +		if (len > UINT_MAX)
> > +			len = UINT_MAX;
> 
> I'm not especially familiar with page_prepare (since it's a gfs2 thing);
> why do you clamp len to UINT_MAX here?

The len parameter of ->page_prepare is an unsigned int.  I don't want
a 1<<32+1 byte I/O to be seen as a 1 byte I/O.  We could upgrade the
parameter to size_t from unsigned int?


  reply index

Thread overview: 32+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-14  3:03 [PATCH 00/14] Transparent Huge Page support for XFS Matthew Wilcox (Oracle)
2020-10-14  3:03 ` [PATCH 01/14] fs: Support THPs in vfs_dedupe_file_range Matthew Wilcox (Oracle)
2020-10-14 16:12   ` Darrick J. Wong
2020-10-14 17:16     ` Matthew Wilcox
2020-10-14  3:03 ` [PATCH 02/14] fs: Make page_mkwrite_check_truncate thp-aware Matthew Wilcox (Oracle)
2020-10-14 16:17   ` Darrick J. Wong
2020-10-14 17:23     ` Matthew Wilcox
2020-10-14  3:03 ` [PATCH 03/14] iomap: Support THPs in BIO completion path Matthew Wilcox (Oracle)
2020-10-15  9:50   ` Christoph Hellwig
2020-10-14  3:03 ` [PATCH 04/14] iomap: Support THPs in iomap_adjust_read_range Matthew Wilcox (Oracle)
2020-10-15  9:50   ` Christoph Hellwig
2020-10-14  3:03 ` [PATCH 05/14] iomap: Support THPs in invalidatepage Matthew Wilcox (Oracle)
2020-10-14 16:33   ` Darrick J. Wong
2020-10-14 17:26     ` Matthew Wilcox
2020-10-14 20:00       ` Brian Foster
2020-10-14  3:03 ` [PATCH 06/14] iomap: Support THPs in iomap_is_partially_uptodate Matthew Wilcox (Oracle)
2020-10-14  3:03 ` [PATCH 07/14] iomap: Support THPs in readpage Matthew Wilcox (Oracle)
2020-10-14 16:39   ` Darrick J. Wong
2020-10-14 17:35     ` Matthew Wilcox
2020-10-14  3:03 ` [PATCH 08/14] iomap: Support THPs in readahead Matthew Wilcox (Oracle)
2020-10-15  9:52   ` Christoph Hellwig
2020-10-14  3:03 ` [PATCH 09/14] iomap: Change iomap_write_begin calling convention Matthew Wilcox (Oracle)
2020-10-14 16:47   ` Darrick J. Wong
2020-10-14 17:41     ` Matthew Wilcox [this message]
2020-10-14 18:08       ` Matthew Wilcox
2020-10-14  3:03 ` [PATCH 10/14] iomap: Handle THPs when writing to pages Matthew Wilcox (Oracle)
2020-10-14  3:03 ` [PATCH 11/14] iomap: Support THP writeback Matthew Wilcox (Oracle)
2020-10-14  3:03 ` [PATCH 12/14] iomap: Inline data shouldn't see THPs Matthew Wilcox (Oracle)
2020-10-14  3:03 ` [PATCH 13/14] iomap: Handle tail pages in iomap_page_mkwrite Matthew Wilcox (Oracle)
2020-10-14  3:03 ` [PATCH 14/14] xfs: Support THPs Matthew Wilcox (Oracle)
2020-10-14 16:51   ` Darrick J. Wong
2020-10-14 17:30     ` Matthew Wilcox

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