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Date: Wed, 26 May 2021 15:45:18 +0200 From: Jan Kara <jack@...e.cz> To: Damien Le Moal <Damien.LeMoal@....com> Cc: Jan Kara <jack@...e.cz>, "Darrick J. Wong" <djwong@...nel.org>, "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>, "hch@...radead.org" <hch@...radead.org>, Dave Chinner <david@...morbit.com>, "ceph-devel@...r.kernel.org" <ceph-devel@...r.kernel.org>, Chao Yu <yuchao0@...wei.com>, "Darrick J. Wong" <darrick.wong@...cle.com>, Jaegeuk Kim <jaegeuk@...nel.org>, Jeff Layton <jlayton@...nel.org>, Johannes Thumshirn <jth@...nel.org>, "linux-cifs@...r.kernel.org" <linux-cifs@...r.kernel.org>, "linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>, "linux-f2fs-devel@...ts.sourceforge.net" <linux-f2fs-devel@...ts.sourceforge.net>, "linux-mm@...ck.org" <linux-mm@...ck.org>, "linux-xfs@...r.kernel.org" <linux-xfs@...r.kernel.org>, Miklos Szeredi <miklos@...redi.hu>, Steve French <sfrench@...ba.org>, Ted Tso <tytso@....edu>, Matthew Wilcox <willy@...radead.org> Subject: Re: [PATCH 04/13] mm: Add functions to lock invalidate_lock for two mappings 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@...e.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. Honza -- Jan Kara <jack@...e.com> SUSE Labs, CR
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