iomap: add a page_done callback (63899c6f) · Commits · 戴 / test

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> Reviewed-by:

Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by:

Darrick J. Wong <darrick.wong@oracle.com>

fs/iomap.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -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;

include/linux/iomap.h

+9 −0

Original line number	Diff line number	Diff line
		@@ -9,6 +9,7 @@ struct fiemap_extent_info;
		struct inode;
		struct iov_iter;
		struct kiocb;
		struct page;
		struct vm_area_struct;
		struct vm_fault;

		@@ -56,6 +57,14 @@ struct iomap {
		struct block_device bdev; / block device for I/O */
		struct dax_device dax_dev; / dax_dev for dax operations */
		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);
		};

		/*

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