From: Andrew Morton <akpm@linux-foundation.org>
To: Christoph Hellwig <hch@lst.de>
Cc: Matthew Wilcox <willy@infradead.org>,
Hugh Dickins <hughd@google.com>,
linux-afs@lists.infradead.org, linux-btrfs@vger.kernel.org,
linux-ext4@vger.kernel.org, cluster-devel@redhat.com,
linux-mm@kvack.org, linux-xfs@vger.kernel.org,
linux-fsdevel@vger.kernel.org, linux-nilfs@vger.kernel.org
Subject: Re: return an ERR_PTR from __filemap_get_folio v2
Date: Tue, 28 Mar 2023 16:04:33 -0700 [thread overview]
Message-ID: <20230328160433.4f3dc32b480239bce9e2f9ef@linux-foundation.org> (raw)
In-Reply-To: <20230121065755.1140136-1-hch@lst.de>
On Sat, 21 Jan 2023 07:57:48 +0100 Christoph Hellwig <hch@lst.de> wrote:
> __filemap_get_folio and its wrappers can return NULL for three different
> conditions, which in some cases requires the caller to reverse engineer
> the decision making. This is fixed by returning an ERR_PTR instead of
> NULL and thus transporting the reason for the failure. But to make
> that work we first need to ensure that no xa_value special case is
> returned and thus return the FGP_ENTRY flag. It turns out that flag
> is barely used and can usually be deal with in a better way.
>
> Note that the shmem patches in here are non-trivial and need some
> careful review and testing.
How are we going with the review and testing. I assume that
we're now OK on the runtime testing front, but do you feel that
review has been adequate?
Thanks.
next prev parent reply other threads:[~2023-03-28 23:04 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-01-21 6:57 return an ERR_PTR from __filemap_get_folio v2 Christoph Hellwig
2023-01-21 6:57 ` [PATCH 1/7] mm: don't look at xarray value entries in split_huge_pages_in_file Christoph Hellwig
2023-01-21 6:57 ` [PATCH 2/7] mm: make mapping_get_entry available outside of filemap.c Christoph Hellwig
2023-01-21 6:57 ` [PATCH 3/7] mm: use filemap_get_entry in filemap_get_incore_folio Christoph Hellwig
2023-01-21 6:57 ` [PATCH 4/7] shmem: remove shmem_get_partial_folio Christoph Hellwig
2023-01-21 6:57 ` [PATCH 5/7] shmem: open code the page cache lookup in shmem_get_folio_gfp Christoph Hellwig
2023-01-21 6:57 ` [PATCH 6/7] mm: remove FGP_ENTRY Christoph Hellwig
2023-01-21 6:57 ` [PATCH 7/7] mm: return an ERR_PTR from __filemap_get_folio Christoph Hellwig
2023-01-21 11:52 ` kernel test robot
2023-01-21 14:28 ` Christoph Hellwig
2023-01-23 15:44 ` David Sterba
2023-01-26 17:24 ` Ryusuke Konishi
2023-03-10 4:31 ` Naoya Horiguchi
2023-03-10 7:00 ` Christoph Hellwig
2023-03-10 8:02 ` Naoya Horiguchi
2023-01-22 1:06 ` return an ERR_PTR from __filemap_get_folio v2 Andrew Morton
2023-01-22 7:20 ` Christoph Hellwig
2023-01-23 18:59 ` Andrew Morton
2023-01-23 19:18 ` Christoph Hellwig
2023-03-28 23:04 ` Andrew Morton [this message]
2023-03-29 23:56 ` Christoph Hellwig
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