fs: iomap based fiemap implementation

Add a simple fiemap implementation based on iomap_ops, partially based
on a previous implementation from Bob Peterson <rpeterso@redhat.com>.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/include/linux/iomap.h b/include/linux/iomap.h
index d2f469ae899a..3267df461012 100644
--- a/include/linux/iomap.h
+++ b/include/linux/iomap.h
@@ -3,6 +3,7 @@
 
 #include <linux/types.h>
 
+struct fiemap_extent_info;
 struct inode;
 struct iov_iter;
 struct kiocb;
@@ -63,5 +64,7 @@ int iomap_truncate_page(struct inode *inode, loff_t pos, bool *did_zero,
                 struct iomap_ops *ops);
 int iomap_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf,
                 struct iomap_ops *ops);
+int iomap_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
+                loff_t start, loff_t len, struct iomap_ops *ops);
 
 #endif /* LINUX_IOMAP_H */