From: Luis Chamberlain <mcgrof@kernel.org>
To: Matthew Wilcox <willy@infradead.org>, ziy@nvidia.com
Cc: "Pankaj Raghav (Samsung)" <kernel@pankajraghav.com>,
djwong@kernel.org, brauner@kernel.org, david@fromorbit.com,
chandan.babu@oracle.com, akpm@linux-foundation.org,
linux-fsdevel@vger.kernel.org, hare@suse.de,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
linux-xfs@vger.kernel.org, gost.dev@samsung.com,
p.raghav@samsung.com
Subject: Re: [PATCH v4 05/11] mm: do not split a folio if it has minimum folio order requirement
Date: Sat, 27 Apr 2024 17:57:17 -0700 [thread overview]
Message-ID: <Zi2e7ecKJK6p6ERu@bombadil.infradead.org> (raw)
In-Reply-To: <Ziw8w3P9vljrO9JV@bombadil.infradead.org>
On Fri, Apr 26, 2024 at 04:46:11PM -0700, Luis Chamberlain wrote:
> On Thu, Apr 25, 2024 at 05:47:28PM -0700, Luis Chamberlain wrote:
> > On Thu, Apr 25, 2024 at 09:10:16PM +0100, Matthew Wilcox wrote:
> > > On Thu, Apr 25, 2024 at 01:37:40PM +0200, Pankaj Raghav (Samsung) wrote:
> > > > From: Pankaj Raghav <p.raghav@samsung.com>
> > > >
> > > > using that API for LBS is resulting in an NULL ptr dereference
> > > > error in the writeback path [1].
> > > >
> > > > [1] https://gist.github.com/mcgrof/d12f586ec6ebe32b2472b5d634c397df
> > >
> > > How would I go about reproducing this?
Well so the below fixes this but I am not sure if this is correct.
folio_mark_dirty() at least says that a folio should not be truncated
while its running. I am not sure if we should try to split folios then
even though we check for writeback once. truncate_inode_partial_folio()
will folio_wait_writeback() but it will split_folio() before checking
for claiming to fail to truncate with folio_test_dirty(). But since the
folio is locked its not clear why this should be possible.
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 83955362d41c..90195506211a 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -3058,7 +3058,7 @@ int split_huge_page_to_list_to_order(struct page *page, struct list_head *list,
if (new_order >= folio_order(folio))
return -EINVAL;
- if (folio_test_writeback(folio))
+ if (folio_test_dirty(folio) || folio_test_writeback(folio))
return -EBUSY;
if (!folio_test_anon(folio)) {
next prev parent reply other threads:[~2024-04-28 0:57 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-04-25 11:37 [PATCH v4 00/11] enable bs > ps in XFS Pankaj Raghav (Samsung)
2024-04-25 11:37 ` [PATCH v4 01/11] readahead: rework loop in page_cache_ra_unbounded() Pankaj Raghav (Samsung)
2024-04-25 11:37 ` [PATCH v4 02/11] fs: Allow fine-grained control of folio sizes Pankaj Raghav (Samsung)
2024-04-25 18:07 ` Hannes Reinecke
2024-04-26 15:09 ` Darrick J. Wong
2024-04-25 11:37 ` [PATCH v4 03/11] filemap: allocate mapping_min_order folios in the page cache Pankaj Raghav (Samsung)
2024-04-25 19:04 ` Hannes Reinecke
2024-04-26 15:12 ` Darrick J. Wong
2024-04-28 20:59 ` Pankaj Raghav (Samsung)
2024-04-25 11:37 ` [PATCH v4 04/11] readahead: allocate folios with mapping_min_order in readahead Pankaj Raghav (Samsung)
2024-04-25 18:53 ` Matthew Wilcox
2024-04-25 11:37 ` [PATCH v4 05/11] mm: do not split a folio if it has minimum folio order requirement Pankaj Raghav (Samsung)
2024-04-25 20:10 ` Matthew Wilcox
2024-04-26 0:47 ` Luis Chamberlain
2024-04-26 23:46 ` Luis Chamberlain
2024-04-28 0:57 ` Luis Chamberlain [this message]
2024-04-29 3:56 ` Luis Chamberlain
2024-04-29 14:29 ` Zi Yan
2024-04-30 0:31 ` Luis Chamberlain
2024-04-30 0:49 ` Luis Chamberlain
2024-04-30 2:43 ` Zi Yan
2024-04-30 19:27 ` Luis Chamberlain
2024-05-01 4:13 ` Matthew Wilcox
2024-05-01 14:28 ` Matthew Wilcox
2024-04-26 15:49 ` Pankaj Raghav (Samsung)
2024-04-25 11:37 ` [PATCH v4 06/11] filemap: cap PTE range to be created to i_size in folio_map_range() Pankaj Raghav (Samsung)
2024-04-25 20:24 ` Matthew Wilcox
2024-04-26 12:54 ` Pankaj Raghav (Samsung)
2024-04-25 11:37 ` [PATCH v4 07/11] iomap: fix iomap_dio_zero() for fs bs > system page size Pankaj Raghav (Samsung)
2024-04-26 6:22 ` Christoph Hellwig
2024-04-26 11:43 ` Pankaj Raghav (Samsung)
2024-04-27 5:12 ` Christoph Hellwig
2024-04-29 21:02 ` Pankaj Raghav (Samsung)
2024-04-27 3:26 ` Matthew Wilcox
2024-04-27 4:52 ` Christoph Hellwig
2024-04-25 11:37 ` [PATCH v4 08/11] xfs: use kvmalloc for xattr buffers Pankaj Raghav (Samsung)
2024-04-26 15:18 ` Darrick J. Wong
2024-04-28 21:06 ` Pankaj Raghav (Samsung)
2024-04-25 11:37 ` [PATCH v4 09/11] xfs: expose block size in stat Pankaj Raghav (Samsung)
2024-04-26 15:15 ` Darrick J. Wong
2024-04-25 11:37 ` [PATCH v4 10/11] xfs: make the calculation generic in xfs_sb_validate_fsb_count() Pankaj Raghav (Samsung)
2024-04-26 15:16 ` Darrick J. Wong
2024-04-25 11:37 ` [PATCH v4 11/11] xfs: enable block size larger than page size support Pankaj Raghav (Samsung)
2024-04-26 15:18 ` Darrick J. Wong
2024-04-27 4:42 ` [PATCH v4 00/11] enable bs > ps in XFS Ritesh Harjani
2024-04-27 5:05 ` Darrick J. Wong
2024-04-29 20:39 ` Pankaj Raghav (Samsung)
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