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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.

WARNING: multiple messages have this Message-ID (diff)
From: Andrew Morton <akpm@linux-foundation.org>
To: cluster-devel.redhat.com
Subject: [Cluster-devel] 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.


  parent reply	other threads:[~2023-03-28 23:04 UTC|newest]

Thread overview: 53+ 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 ` Christoph Hellwig
2023-01-21  6:57 ` [Cluster-devel] " 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   ` [Cluster-devel] " 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   ` [Cluster-devel] " 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   ` Christoph Hellwig
2023-01-21  6:57   ` [Cluster-devel] " Christoph Hellwig
2023-01-21  6:57 ` [PATCH 4/7] shmem: remove shmem_get_partial_folio Christoph Hellwig
2023-01-21  6:57   ` [Cluster-devel] " 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   ` Christoph Hellwig
2023-01-21  6:57   ` [Cluster-devel] " Christoph Hellwig
2023-01-21  6:57 ` [PATCH 6/7] mm: remove FGP_ENTRY Christoph Hellwig
2023-01-21  6:57   ` [Cluster-devel] " Christoph Hellwig
2023-01-21  6:57 ` [PATCH 7/7] mm: return an ERR_PTR from __filemap_get_folio Christoph Hellwig
2023-01-21  6:57   ` [Cluster-devel] " Christoph Hellwig
2023-01-21 11:52   ` kernel test robot
2023-01-21 11:52     ` kernel test robot
2023-01-21 11:52     ` [Cluster-devel] " kernel test robot
2023-01-21 14:28     ` Christoph Hellwig
2023-01-21 14:28       ` [Cluster-devel] " Christoph Hellwig
2023-01-23 15:44   ` David Sterba
2023-01-23 15:44     ` [Cluster-devel] " David Sterba
2023-01-26 17:24   ` Ryusuke Konishi
2023-01-26 17:24     ` Ryusuke Konishi
2023-01-26 17:24     ` [Cluster-devel] " Ryusuke Konishi
2023-03-10  4:31   ` Naoya Horiguchi
2023-03-10  4:31     ` [Cluster-devel] " Naoya Horiguchi
2023-03-10  7:00     ` Christoph Hellwig
2023-03-10  7:00       ` Christoph Hellwig
2023-03-10  7:00       ` [Cluster-devel] " Christoph Hellwig
2023-03-10  8:02       ` Naoya Horiguchi
2023-03-10  8:02         ` [Cluster-devel] " Naoya Horiguchi
2023-01-22  1:06 ` return an ERR_PTR from __filemap_get_folio v2 Andrew Morton
2023-01-22  1:06   ` Andrew Morton
2023-01-22  1:06   ` [Cluster-devel] " Andrew Morton
2023-01-22  7:20   ` Christoph Hellwig
2023-01-22  7:20     ` Christoph Hellwig
2023-01-22  7:20     ` [Cluster-devel] " Christoph Hellwig
2023-01-23 18:59     ` Andrew Morton
2023-01-23 18:59       ` Andrew Morton
2023-01-23 18:59       ` [Cluster-devel] " Andrew Morton
2023-01-23 19:18       ` Christoph Hellwig
2023-01-23 19:18         ` Christoph Hellwig
2023-01-23 19:18         ` [Cluster-devel] " Christoph Hellwig
2023-03-28 23:04 ` Andrew Morton [this message]
2023-03-28 23:04   ` Andrew Morton
2023-03-29 23:56   ` Christoph Hellwig
2023-03-29 23:56     ` Christoph Hellwig
2023-03-29 23:56     ` [Cluster-devel] " Christoph Hellwig

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