From: "Darrick J. Wong" <djwong@kernel.org>
To: Jan Kara <jack@suse.cz>
Cc: Damien Le Moal <Damien.LeMoal@wdc.com>,
"linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>,
"hch@infradead.org" <hch@infradead.org>,
Dave Chinner <david@fromorbit.com>,
"ceph-devel@vger.kernel.org" <ceph-devel@vger.kernel.org>,
Chao Yu <yuchao0@huawei.com>,
"Darrick J. Wong" <darrick.wong@oracle.com>,
Jaegeuk Kim <jaegeuk@kernel.org>,
Jeff Layton <jlayton@kernel.org>,
Johannes Thumshirn <jth@kernel.org>,
"linux-cifs@vger.kernel.org" <linux-cifs@vger.kernel.org>,
"linux-ext4@vger.kernel.org" <linux-ext4@vger.kernel.org>,
"linux-f2fs-devel@lists.sourceforge.net"
<linux-f2fs-devel@lists.sourceforge.net>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
"linux-xfs@vger.kernel.org" <linux-xfs@vger.kernel.org>,
Miklos Szeredi <miklos@szeredi.hu>,
Steve French <sfrench@samba.org>, Ted Tso <tytso@mit.edu>,
Matthew Wilcox <willy@infradead.org>
Subject: Re: [PATCH 04/13] mm: Add functions to lock invalidate_lock for two mappings
Date: Wed, 26 May 2021 08:25:25 -0700 [thread overview]
Message-ID: <20210526152525.GY202121@locust> (raw)
In-Reply-To: <20210526134518.GF30369@quack2.suse.cz>
On Wed, May 26, 2021 at 03:45:18PM +0200, Jan Kara wrote:
> On Wed 26-05-21 12:11:43, Damien Le Moal wrote:
> > On 2021/05/26 19:07, Jan Kara wrote:
> > > On Tue 25-05-21 13:48:05, Darrick J. Wong wrote:
> > >> On Tue, May 25, 2021 at 03:50:41PM +0200, Jan Kara wrote:
> > >>> Some operations such as reflinking blocks among files will need to lock
> > >>> invalidate_lock for two mappings. Add helper functions to do that.
> > >>>
> > >>> Signed-off-by: Jan Kara <jack@suse.cz>
> > >>> ---
> > >>> include/linux/fs.h | 6 ++++++
> > >>> mm/filemap.c | 38 ++++++++++++++++++++++++++++++++++++++
> > >>> 2 files changed, 44 insertions(+)
> > >>>
> > >>> diff --git a/include/linux/fs.h b/include/linux/fs.h
> > >>> index 897238d9f1e0..e6f7447505f5 100644
> > >>> --- a/include/linux/fs.h
> > >>> +++ b/include/linux/fs.h
> > >>> @@ -822,6 +822,12 @@ static inline void inode_lock_shared_nested(struct inode *inode, unsigned subcla
> > >>> void lock_two_nondirectories(struct inode *, struct inode*);
> > >>> void unlock_two_nondirectories(struct inode *, struct inode*);
> > >>>
> > >>> +void filemap_invalidate_down_write_two(struct address_space *mapping1,
> > >>> + struct address_space *mapping2);
> > >>> +void filemap_invalidate_up_write_two(struct address_space *mapping1,
> > >>
> > >> TBH I find myself wishing that the invalidate_lock used the same
> > >> lock/unlock style wrappers that we use for i_rwsem.
> > >>
> > >> filemap_invalidate_lock(inode1->mapping);
> > >> filemap_invalidate_lock_two(inode1->i_mapping, inode2->i_mapping);
> > >
> > > OK, and filemap_invalidate_lock_shared() for down_read()? I guess that
> > > works for me.
> >
> > What about filemap_invalidate_lock_read() and filemap_invalidate_lock_write() ?
> > That reminds the down_read()/down_write() without the slightly confusing down/up.
>
> Well, if we go for lock wrappers as Darrick suggested, I'd mirror naming
> used for inode_lock(). That is IMO the least confusing option... And that
> naming has _lock and _lock_shared suffixes.
I'd like filemap_invalidate_lock and filemap_invalidate_lock_shared.
--D
>
> Honza
>
> --
> Jan Kara <jack@suse.com>
> SUSE Labs, CR
next prev parent reply other threads:[~2021-05-26 15:25 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-25 13:50 [PATCH 0/13 v6] fs: Hole punch vs page cache filling races Jan Kara
2021-05-25 13:50 ` [PATCH 01/13] mm: Fix comments mentioning i_mutex Jan Kara
2021-05-25 13:50 ` [PATCH 02/13] documentation: Sync file_operations members with reality Jan Kara
2021-05-25 20:43 ` Darrick J. Wong
2021-05-25 13:50 ` [PATCH 03/13] mm: Protect operations adding pages to page cache with invalidate_lock Jan Kara
2021-05-25 21:01 ` Darrick J. Wong
2021-05-26 10:00 ` Jan Kara
2021-05-25 13:50 ` [PATCH 04/13] mm: Add functions to lock invalidate_lock for two mappings Jan Kara
2021-05-25 20:48 ` Darrick J. Wong
2021-05-26 10:07 ` Jan Kara
2021-05-26 12:11 ` Damien Le Moal
2021-05-26 13:45 ` Jan Kara
2021-05-26 15:25 ` Darrick J. Wong [this message]
2021-05-25 13:50 ` [PATCH 05/13] ext4: Convert to use mapping->invalidate_lock Jan Kara
2021-05-25 13:50 ` [PATCH 06/13] ext2: Convert to using invalidate_lock Jan Kara
2021-05-25 13:50 ` [PATCH 07/13] xfs: Convert to use invalidate_lock Jan Kara
2021-05-25 21:37 ` Darrick J. Wong
2021-05-26 10:18 ` Jan Kara
2021-05-26 15:32 ` Darrick J. Wong
2021-05-27 12:01 ` Jan Kara
2021-05-25 21:40 ` Dave Chinner
2021-05-26 10:20 ` Jan Kara
2021-05-26 13:42 ` Jan Kara
2021-05-25 13:50 ` [PATCH 08/13] xfs: Convert double locking of MMAPLOCK to use VFS helpers Jan Kara
2021-05-25 21:41 ` Darrick J. Wong
2021-05-25 13:50 ` [PATCH 09/13] zonefs: Convert to using invalidate_lock Jan Kara
2021-05-25 13:50 ` [PATCH 10/13] f2fs: " Jan Kara
2021-05-26 9:55 ` Chao Yu
2021-05-25 13:50 ` [PATCH 11/13] fuse: " Jan Kara
2021-05-25 13:50 ` [PATCH 12/13] ceph: Fix race between hole punch and page fault Jan Kara
2021-05-25 13:50 ` [PATCH 13/13] cifs: " Jan Kara
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