Linux-Fsdevel Archive on lore.kernel.org
 help / color / Atom feed
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
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


             reply index

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

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20200917151050.5363-1-willy@infradead.org \
    --to=willy@infradead.org \
    --cc=ceph-devel@vger.kernel.org \
    --cc=ecryptfs@vger.kernel.org \
    --cc=linux-afs@lists.infradead.org \
    --cc=linux-cifs@vger.kernel.org \
    --cc=linux-fsdevel@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-mm@kvack.org \
    --cc=linux-mtd@lists.infradead.org \
    --cc=linux-um@lists.infradead.org \
    --cc=richard@nod.at \
    --cc=v9fs-developer@lists.sourceforge.net \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

Linux-Fsdevel Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-fsdevel/0 linux-fsdevel/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-fsdevel linux-fsdevel/ https://lore.kernel.org/linux-fsdevel \
		linux-fsdevel@vger.kernel.org
	public-inbox-index linux-fsdevel

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-fsdevel


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git