From: "Darrick J. Wong" <djwong@kernel.org>
To: Jan Kara <jack@suse.cz>
Cc: linux-fsdevel@vger.kernel.org,
Christoph Hellwig <hch@infradead.org>,
Dave Chinner <david@fromorbit.com>,
ceph-devel@vger.kernel.org, Chao Yu <yuchao0@huawei.com>,
Damien Le Moal <damien.lemoal@wdc.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-ext4@vger.kernel.org,
linux-f2fs-devel@lists.sourceforge.net, linux-mm@kvack.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 04/14] mm: Add functions to lock invalidate_lock for two mappings
Date: Mon, 7 Jun 2021 08:46:22 -0700 [thread overview]
Message-ID: <20210607154622.GG2945738@locust> (raw)
In-Reply-To: <20210607145236.31852-4-jack@suse.cz>
On Mon, Jun 07, 2021 at 04:52:14PM +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>
Straightforward lift from xfs, though now with vfs lock ordering
rules...
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
--D
> ---
> 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 d8afbc9661d7..ddc11bafc183 100644
> --- a/include/linux/fs.h
> +++ b/include/linux/fs.h
> @@ -849,6 +849,12 @@ static inline void filemap_invalidate_unlock_shared(
> void lock_two_nondirectories(struct inode *, struct inode*);
> void unlock_two_nondirectories(struct inode *, struct inode*);
>
> +void filemap_invalidate_lock_two(struct address_space *mapping1,
> + struct address_space *mapping2);
> +void filemap_invalidate_unlock_two(struct address_space *mapping1,
> + struct address_space *mapping2);
> +
> +
> /*
> * NOTE: in a 32bit arch with a preemptable kernel and
> * an UP compile the i_size_read/write must be atomic
> diff --git a/mm/filemap.c b/mm/filemap.c
> index c8e7e451d81e..b8e9bccecd9f 100644
> --- a/mm/filemap.c
> +++ b/mm/filemap.c
> @@ -1009,6 +1009,44 @@ struct page *__page_cache_alloc(gfp_t gfp)
> EXPORT_SYMBOL(__page_cache_alloc);
> #endif
>
> +/*
> + * filemap_invalidate_lock_two - lock invalidate_lock for two mappings
> + *
> + * Lock exclusively invalidate_lock of any passed mapping that is not NULL.
> + *
> + * @mapping1: the first mapping to lock
> + * @mapping2: the second mapping to lock
> + */
> +void filemap_invalidate_lock_two(struct address_space *mapping1,
> + struct address_space *mapping2)
> +{
> + if (mapping1 > mapping2)
> + swap(mapping1, mapping2);
> + if (mapping1)
> + down_write(&mapping1->invalidate_lock);
> + if (mapping2 && mapping1 != mapping2)
> + down_write_nested(&mapping2->invalidate_lock, 1);
> +}
> +EXPORT_SYMBOL(filemap_invalidate_lock_two);
> +
> +/*
> + * filemap_invalidate_unlock_two - unlock invalidate_lock for two mappings
> + *
> + * Unlock exclusive invalidate_lock of any passed mapping that is not NULL.
> + *
> + * @mapping1: the first mapping to unlock
> + * @mapping2: the second mapping to unlock
> + */
> +void filemap_invalidate_unlock_two(struct address_space *mapping1,
> + struct address_space *mapping2)
> +{
> + if (mapping1)
> + up_write(&mapping1->invalidate_lock);
> + if (mapping2 && mapping1 != mapping2)
> + up_write(&mapping2->invalidate_lock);
> +}
> +EXPORT_SYMBOL(filemap_invalidate_unlock_two);
> +
> /*
> * In order to wait for pages to become available there must be
> * waitqueues associated with pages. By using a hash table of
> --
> 2.26.2
>
next prev parent reply other threads:[~2021-06-07 15:46 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-07 14:52 [PATCH 0/14 v7] fs: Hole punch vs page cache filling races Jan Kara
2021-06-07 14:52 ` [PATCH 01/14] mm: Fix comments mentioning i_mutex Jan Kara
2021-06-07 15:31 ` Darrick J. Wong
2021-06-10 9:06 ` Ming Lei
2021-06-10 10:40 ` Jan Kara
2021-06-07 14:52 ` [PATCH 02/14] documentation: Sync file_operations members with reality Jan Kara
2021-06-07 14:52 ` [PATCH 03/14] mm: Protect operations adding pages to page cache with invalidate_lock Jan Kara
2021-06-07 16:09 ` Darrick J. Wong
2021-06-08 12:19 ` Jan Kara
2021-06-07 14:52 ` [PATCH 04/14] mm: Add functions to lock invalidate_lock for two mappings Jan Kara
2021-06-07 15:46 ` Darrick J. Wong [this message]
2021-06-07 14:52 ` [PATCH 05/14] ext4: Convert to use mapping->invalidate_lock Jan Kara
2021-06-07 14:52 ` [PATCH 06/14] ext2: Convert to using invalidate_lock Jan Kara
2021-06-07 14:52 ` [PATCH 07/14] xfs: Refactor xfs_isilocked() Jan Kara
2021-06-07 15:49 ` Darrick J. Wong
2021-06-08 22:18 ` Dave Chinner
2021-06-07 14:52 ` [PATCH 08/14] xfs: Convert to use invalidate_lock Jan Kara
2021-06-07 15:56 ` Darrick J. Wong
2021-06-08 12:23 ` Jan Kara
2021-06-07 14:52 ` [PATCH 09/14] xfs: Convert double locking of MMAPLOCK to use VFS helpers Jan Kara
2021-06-07 15:57 ` Darrick J. Wong
2021-06-07 14:52 ` [PATCH 10/14] zonefs: Convert to using invalidate_lock Jan Kara
2021-06-07 14:52 ` [PATCH 11/14] f2fs: " Jan Kara
2021-06-07 14:52 ` [PATCH 12/14] fuse: " Jan Kara
2021-06-10 12:42 ` Miklos Szeredi
2021-06-07 14:52 ` [PATCH 13/14] ceph: Fix race between hole punch and page fault Jan Kara
2021-06-07 14:52 ` [PATCH 14/14] cifs: " Jan Kara
2021-06-08 11:54 ` [PATCH 0/14 v7] fs: Hole punch vs page cache filling races Jan Kara
2021-06-15 9:17 [PATCH 0/14 v8] " Jan Kara
2021-06-15 9:17 ` [PATCH 04/14] mm: Add functions to lock invalidate_lock for two mappings Jan Kara
2021-06-16 5:34 ` Christoph Hellwig
2021-07-12 16:55 [PATCH 0/14 v9] fs: Hole punch vs page cache filling races Jan Kara
2021-07-12 16:55 ` [PATCH 04/14] mm: Add functions to lock invalidate_lock for two mappings Jan Kara
2021-07-15 13:40 [PATCH 0/14 v10] fs: Hole punch vs page cache filling races Jan Kara
2021-07-15 13:40 ` [PATCH 04/14] mm: Add functions to lock invalidate_lock for two mappings Jan Kara
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