From: Matthew Wilcox <willy@infradead.org>
To: Andreas Gruenbacher <agruenba@redhat.com>
Cc: cluster-devel <cluster-devel@redhat.com>,
linux-ext4 <linux-ext4@vger.kernel.org>,
Joseph Qi <joseph.qi@linux.alibaba.com>,
John Hubbard <jhubbard@nvidia.com>,
Steven Whitehouse <swhiteho@redhat.com>,
LKML <linux-kernel@vger.kernel.org>,
Junxiao Bi <junxiao.bi@oracle.com>,
linux-xfs@vger.kernel.org,
William Kucharski <william.kucharski@oracle.com>,
Christoph Hellwig <hch@lst.de>,
linux-btrfs@vger.kernel.org,
linux-fsdevel <linux-fsdevel@vger.kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
linux-f2fs-devel@lists.sourceforge.net,
linux-erofs@lists.ozlabs.org, Linux-MM <linux-mm@kvack.org>,
ocfs2-devel@oss.oracle.com, Bob Peterson <rpeterso@redhat.com>
Subject: Re: [Cluster-devel] [PATCH v11 16/25] fs: Convert mpage_readpages to mpage_readahead
Date: Tue, 16 Jun 2020 17:32:16 -0700 [thread overview]
Message-ID: <20200617003216.GC8681@bombadil.infradead.org> (raw)
In-Reply-To: <CAHc6FU4m1M7Tv4scX0UxSiVBqkL=Vcw_z-R7SufL8k7Bw=qPOw@mail.gmail.com>
On Wed, Jun 17, 2020 at 12:36:13AM +0200, Andreas Gruenbacher wrote:
> Am Mi., 15. Apr. 2020 um 23:39 Uhr schrieb Matthew Wilcox <willy@infradead.org>:
> > From: "Matthew Wilcox (Oracle)" <willy@infradead.org>
> >
> > Implement the new readahead aop and convert all callers (block_dev,
> > exfat, ext2, fat, gfs2, hpfs, isofs, jfs, nilfs2, ocfs2, omfs, qnx6,
> > reiserfs & udf). The callers are all trivial except for GFS2 & OCFS2.
>
> This patch leads to an ABBA deadlock in xfstest generic/095 on gfs2.
>
> Our lock hierarchy is such that the inode cluster lock ("inode glock")
> for an inode needs to be taken before any page locks in that inode's
> address space.
How does that work for ...
writepage: yes, unlocks (see below)
readpage: yes, unlocks
invalidatepage: yes
releasepage: yes
freepage: yes
isolate_page: yes
migratepage: yes (both)
putback_page: yes
launder_page: yes
is_partially_uptodate: yes
error_remove_page: yes
Is there a reason that you don't take the glock in the higher level
ops which are called before readhead gets called? I'm looking at XFS,
and it takes the xfs_ilock SHARED in xfs_file_buffered_aio_read()
(called from xfs_file_read_iter).
Not that after -rc1 is a great time to be upending the locking model in
a filesystem ... but then, this has been baking in -mm for ten weeks and
the GFS2 mailing list has been on the cc for the patches for five months,
so I don't have a lot of sympathy for this.
next prev parent reply other threads:[~2020-06-17 0:32 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-14 15:02 [PATCH v11 00/25] Change readahead API Matthew Wilcox
2020-04-14 15:02 ` [PATCH v11 01/25] mm: Move readahead prototypes from mm.h Matthew Wilcox
2020-04-15 9:10 ` Johannes Thumshirn
2020-04-14 15:02 ` [PATCH v11 02/25] mm: Return void from various readahead functions Matthew Wilcox
2020-04-14 15:02 ` [PATCH v11 03/25] mm: Ignore return value of ->readpages Matthew Wilcox
2020-04-15 9:17 ` Johannes Thumshirn
2020-04-14 15:02 ` [PATCH v11 04/25] mm: Move readahead nr_pages check into read_pages Matthew Wilcox
2020-04-15 9:19 ` Johannes Thumshirn
2020-04-14 15:02 ` [PATCH v11 05/25] mm: Add new readahead_control API Matthew Wilcox
2020-04-15 1:17 ` Andrew Morton
2020-04-15 2:18 ` Matthew Wilcox
2020-04-15 4:56 ` Andrew Morton
2020-04-15 11:22 ` Matthew Wilcox
2020-04-14 15:02 ` [PATCH v11 06/25] mm: Use readahead_control to pass arguments Matthew Wilcox
2020-04-15 9:30 ` Johannes Thumshirn
2020-04-14 15:02 ` [PATCH v11 07/25] mm: Rename various 'offset' parameters to 'index' Matthew Wilcox
2020-04-14 15:02 ` [PATCH v11 08/25] mm: rename readahead loop variable to 'i' Matthew Wilcox
2020-04-15 9:31 ` Johannes Thumshirn
2020-04-14 15:02 ` [PATCH v11 09/25] mm: Remove 'page_offset' from readahead loop Matthew Wilcox
2020-04-14 15:02 ` [PATCH v11 10/25] mm: Put readahead pages in cache earlier Matthew Wilcox
2020-04-14 15:02 ` [PATCH v11 11/25] mm: Add readahead address space operation Matthew Wilcox
2020-04-14 15:02 ` [PATCH v11 12/25] mm: Move end_index check out of readahead loop Matthew Wilcox
2020-04-14 15:02 ` [PATCH v11 13/25] mm: Add page_cache_readahead_unbounded Matthew Wilcox
2020-04-14 15:02 ` [PATCH v11 14/25] mm: Document why we don't set PageReadahead Matthew Wilcox
2020-04-14 15:02 ` [PATCH v11 15/25] mm: Use memalloc_nofs_save in readahead path Matthew Wilcox
2020-04-14 15:02 ` [PATCH v11 16/25] fs: Convert mpage_readpages to mpage_readahead Matthew Wilcox
2020-06-16 22:36 ` [Cluster-devel] " Andreas Gruenbacher
2020-06-17 0:32 ` Matthew Wilcox [this message]
2020-06-17 0:57 ` Andreas Grünbacher
2020-06-17 2:21 ` Matthew Wilcox
2020-06-18 12:46 ` Andreas Gruenbacher
2020-06-18 15:03 ` Matthew Wilcox
2020-06-18 16:40 ` Andreas Gruenbacher
2020-04-14 15:02 ` [PATCH v11 17/25] btrfs: Convert from readpages to readahead Matthew Wilcox
2020-04-14 15:02 ` [PATCH v11 18/25] erofs: Convert uncompressed files " Matthew Wilcox
2020-04-14 15:02 ` [PATCH v11 19/25] erofs: Convert compressed " Matthew Wilcox
2020-04-21 5:42 ` Andrew Morton
2020-04-21 7:28 ` Gao Xiang via Linux-erofs
2020-04-14 15:02 ` [PATCH v11 20/25] ext4: Convert " Matthew Wilcox
2020-04-14 15:02 ` [PATCH v11 21/25] ext4: Pass the inode to ext4_mpage_readpages Matthew Wilcox
2020-04-14 15:02 ` [PATCH v11 22/25] f2fs: Convert from readpages to readahead Matthew Wilcox
2020-04-14 15:02 ` [PATCH v11 23/25] f2fs: Pass the inode to f2fs_mpage_readpages Matthew Wilcox
2020-04-14 15:02 ` [PATCH v11 24/25] fuse: Convert from readpages to readahead Matthew Wilcox
2020-04-20 11:14 ` Miklos Szeredi
2020-04-20 11:43 ` Matthew Wilcox
2020-04-20 11:54 ` Miklos Szeredi
2020-04-14 15:02 ` [PATCH v11 25/25] iomap: " Matthew Wilcox
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