diff mbox series

[6/6] iomap: add a page_done callback

Message ID 20180614120457.28285-7-hch@lst.de
State Not Applicable, archived
Headers show
Series [1/6] fs: factor out a __generic_write_end helper | expand

Commit Message

Christoph Hellwig June 14, 2018, 12:04 p.m. UTC 
This will be used by gfs2 to attach data to transactions for the journaled
data mode.  But the concept is generic enough that we might be able to
use it for other purposes like encryption/integrity post-processing in the
future.

Based on a patch from Andreas Gruenbacher.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 fs/iomap.c            | 3 +++
 include/linux/iomap.h | 9 +++++++++
 2 files changed, 12 insertions(+)
diff mbox series

Patch

diff --git a/fs/iomap.c b/fs/iomap.c
index 6d5a2ebe5dd8..9e265118e8b0 100644
--- a/fs/iomap.c
+++ b/fs/iomap.c
@@ -201,6 +201,9 @@  iomap_write_end(struct inode *inode, loff_t pos, unsigned len,
 				copied, page, NULL);
 	}
 
+	if (iomap->page_done)
+		iomap->page_done(inode, pos, copied, page, iomap);
+
 	if (ret < len)
 		iomap_write_failed(inode, pos, len);
 	return ret;
diff --git a/include/linux/iomap.h b/include/linux/iomap.h
index 69ef622f650e..43cc9208599f 100644
--- a/include/linux/iomap.h
+++ b/include/linux/iomap.h
@@ -9,6 +9,7 @@  struct fiemap_extent_info;
 struct inode;
 struct iov_iter;
 struct kiocb;
+struct page;
 struct vm_area_struct;
 struct vm_fault;
 
@@ -58,6 +59,14 @@  struct iomap {
 		struct dax_device   *dax_dev;
 		void		    *inline_data;
 	};
+
+	/*
+	 * Called when finished processing a page in the mapping returned in
+	 * this iomap.  At least for now this is only supported in the buffered
+	 * write path.
+	 */
+	void (*page_done)(struct inode *inode, loff_t pos, unsigned copied,
+			struct page *page, struct iomap *iomap);
 };
 
 /*