From: "Matthew Wilcox (Oracle)" <willy@infradead.org>
To: linux-fsdevel@vger.kernel.org
Cc: "Matthew Wilcox (Oracle)" <willy@infradead.org>,
linux-mm@kvack.org, v9fs-developer@lists.sourceforge.net,
linux-kernel@vger.kernel.org, linux-afs@lists.infradead.org,
ceph-devel@vger.kernel.org, linux-cifs@vger.kernel.org,
ecryptfs@vger.kernel.org, linux-um@lists.infradead.org,
linux-mtd@lists.infradead.org,
Richard Weinberger <richard@nod.at>
Subject: [PATCH 00/13] Allow readpage to return a locked page
Date: Thu, 17 Sep 2020 16:10:37 +0100 [thread overview]
Message-ID: <20200917151050.5363-1-willy@infradead.org> (raw)
Linus recently made the page lock more fair. That means that the old
pattern where we returned from ->readpage with the page unlocked and
then attempted to re-lock it will send us to the back of the queue for
this page's lock.
Ideally all filesystems would return from ->readpage with the
page Uptodate and Locked, but it's a bit painful to convert all the
asynchronous readpage implementations to synchronous. These ones are
already synchronous, so convert them while I work on iomap.
A further benefit is that a synchronous readpage implementation allows
us to return an error to someone who might actually care about it.
There's no need to SetPageError, but I don't want to learn about how
a dozen filesystems handle I/O errors (hint: they're all different),
so I have not attempted to change that.
Please review your filesystem carefully. I've tried to catch all the
places where a filesystem calls its own internal readpage implementation
without going through ->readpage, but I may have missed some.
Matthew Wilcox (Oracle) (13):
mm: Add AOP_UPDATED_PAGE return value
9p: Tell the VFS that readpage was synchronous
afs: Tell the VFS that readpage was synchronous
ceph: Tell the VFS that readpage was synchronous
cifs: Tell the VFS that readpage was synchronous
cramfs: Tell the VFS that readpage was synchronous
ecryptfs: Tell the VFS that readpage was synchronous
fuse: Tell the VFS that readpage was synchronous
hostfs: Tell the VFS that readpage was synchronous
jffs2: Tell the VFS that readpage was synchronous
ubifs: Tell the VFS that readpage was synchronous
udf: Tell the VFS that readpage was synchronous
vboxsf: Tell the VFS that readpage was synchronous
Documentation/filesystems/locking.rst | 7 ++++---
Documentation/filesystems/vfs.rst | 21 ++++++++++++++-------
fs/9p/vfs_addr.c | 6 +++++-
fs/afs/file.c | 3 ++-
fs/ceph/addr.c | 9 +++++----
fs/cifs/file.c | 8 ++++++--
fs/cramfs/inode.c | 5 ++---
fs/ecryptfs/mmap.c | 11 ++++++-----
fs/fuse/file.c | 2 ++
fs/hostfs/hostfs_kern.c | 2 ++
fs/jffs2/file.c | 6 ++++--
fs/ubifs/file.c | 16 ++++++++++------
fs/udf/file.c | 3 +--
fs/vboxsf/file.c | 2 ++
include/linux/fs.h | 5 +++++
mm/filemap.c | 12 ++++++++++--
16 files changed, 80 insertions(+), 38 deletions(-)
--
2.28.0
next reply other threads:[~2020-09-17 19:42 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-17 15:10 Matthew Wilcox (Oracle) [this message]
2020-09-17 15:10 ` [PATCH 01/13] mm: Add AOP_UPDATED_PAGE return value Matthew Wilcox (Oracle)
2020-09-17 22:03 ` Matthew Wilcox
2020-09-17 15:10 ` [PATCH 02/13] 9p: Tell the VFS that readpage was synchronous Matthew Wilcox (Oracle)
2020-09-18 5:59 ` [V9fs-developer] " Dominique Martinet
2020-09-18 11:19 ` Matthew Wilcox
2020-09-18 12:30 ` Dominique Martinet
2020-09-17 15:10 ` [PATCH 03/13] afs: " Matthew Wilcox (Oracle)
2020-09-17 15:10 ` [PATCH 04/13] ceph: " Matthew Wilcox (Oracle)
2020-09-17 16:49 ` Jeff Layton
2020-09-17 15:10 ` [PATCH 05/13] cifs: " Matthew Wilcox (Oracle)
2020-09-17 15:10 ` [PATCH 06/13] cramfs: " Matthew Wilcox (Oracle)
2020-09-17 15:10 ` [PATCH 07/13] ecryptfs: " Matthew Wilcox (Oracle)
2020-09-17 15:10 ` [PATCH 08/13] fuse: " Matthew Wilcox (Oracle)
2020-09-17 15:10 ` [PATCH 09/13] hostfs: " Matthew Wilcox (Oracle)
2020-09-17 15:10 ` [PATCH 10/13] jffs2: " Matthew Wilcox (Oracle)
2020-09-17 15:10 ` [PATCH 11/13] ubifs: " Matthew Wilcox (Oracle)
2020-09-17 20:46 ` Richard Weinberger
2020-09-17 15:10 ` [PATCH 12/13] udf: " Matthew Wilcox (Oracle)
2020-09-24 9:00 ` Jan Kara
2020-09-17 15:10 ` [PATCH 13/13] vboxsf: " Matthew Wilcox (Oracle)
2020-09-17 22:56 ` [PATCH 14/13] iomap: Inline iomap_iop_set_range_uptodate into its one caller Matthew Wilcox (Oracle)
2020-09-17 22:56 ` [PATCH 15/13] iomap: Inline iomap_read_finish " Matthew Wilcox (Oracle)
2020-09-19 6:31 ` Christoph Hellwig
2020-09-17 22:56 ` [PATCH 16/13] iomap: Make readpage synchronous Matthew Wilcox (Oracle)
2020-09-19 6:39 ` Christoph Hellwig
2020-09-19 6:43 ` Christoph Hellwig
2020-09-19 17:03 ` Matthew Wilcox
2020-09-19 17:10 ` Matthew Wilcox
2020-09-19 6:31 ` [PATCH 14/13] iomap: Inline iomap_iop_set_range_uptodate into its one caller Christoph Hellwig
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