iomap: add a flag to report shared extents

Signed-off-by: Darrick J. Wong <[email protected]> Reviewed-by: Christoph Hellwig <[email protected]> Signed-off-by: Dave Chinner <[email protected]>
majek · Sep 19, 2016 · e43c460 · e43c460
1 parent 5f4e575
commit e43c460
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diff --git a/fs/iomap.c b/fs/iomap.c
@@ -512,6 +512,8 @@ static int iomap_to_fiemap(struct fiemap_extent_info *fi,
 
 	if (iomap->flags & IOMAP_F_MERGED)
 		flags |= FIEMAP_EXTENT_MERGED;
+	if (iomap->flags & IOMAP_F_SHARED)
+		flags |= FIEMAP_EXTENT_SHARED;
 
 	return fiemap_fill_next_extent(fi, iomap->offset,
 			iomap->blkno != IOMAP_NULL_BLOCK ? iomap->blkno << 9: 0,

diff --git a/include/linux/iomap.h b/include/linux/iomap.h
@@ -22,6 +22,7 @@ struct vm_fault;
  * Flags for iomap mappings:
  */
 #define IOMAP_F_MERGED	0x01	/* contains multiple blocks/extents */
+#define IOMAP_F_SHARED	0x02	/* block shared with another file */
 
 /*
  * Magic value for blkno: