From c38f4e96e605f17990e871214e6ea1496bc4e65f Mon Sep 17 00:00:00 2001 From: David Howells Date: Thu, 17 Jun 2021 13:09:21 +0100 Subject: netfs: Provide func to copy data to pagecache for buffered write Provide a netfs write helper, netfs_perform_write() to buffer data to be written in the pagecache and mark the modified folios dirty. It will perform "streaming writes" for folios that aren't currently resident, if possible, storing data in partially modified folios that are marked dirty, but not uptodate. It will also tag pages as belonging to fs-specific write groups if so directed by the filesystem. This is derived from generic_perform_write(), but doesn't use ->write_begin() and ->write_end(), having that logic rolled in instead. Signed-off-by: David Howells cc: Jeff Layton cc: linux-cachefs@redhat.com cc: linux-fsdevel@vger.kernel.org cc: linux-mm@kvack.org --- include/linux/netfs.h | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'include/linux/netfs.h') diff --git a/include/linux/netfs.h b/include/linux/netfs.h index 890a5d8b2299..70f578cf3715 100644 --- a/include/linux/netfs.h +++ b/include/linux/netfs.h @@ -367,6 +367,11 @@ struct netfs_cache_ops { loff_t *_data_start, size_t *_data_len); }; +/* High-level write API */ +ssize_t netfs_perform_write(struct kiocb *iocb, struct iov_iter *iter, + struct netfs_group *netfs_group); + +/* Address operations API */ struct readahead_control; void netfs_readahead(struct readahead_control *); int netfs_read_folio(struct file *, struct folio *); -- cgit v1.2.3-73-gaa49b