[PATCH] E2fsprogs: introduce FIEMAP_EXTENT_SHARED support

[Liu Bo <bo.li.liu@oracle.com>]

Filesystems, such as ocfs2 and btrfs, support shared space that is
shared among different files, so the upstream introduces flag
FIEMAP_EXTENT_SHARED for that.

With this, e2fsprogs's filefrag also support the flag.

Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
---
 lib/ext2fs/fiemap.h |    2 ++
 misc/filefrag.c     |    2 ++
 2 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/lib/ext2fs/fiemap.h b/lib/ext2fs/fiemap.h
index 30bf555..895cd0b 100644
--- a/lib/ext2fs/fiemap.h
+++ b/lib/ext2fs/fiemap.h
@@ -64,5 +64,7 @@ struct fiemap {
 #define FIEMAP_EXTENT_MERGED		0x00001000 /* File does not natively
 						    * support extents. Result
 						    * merged for efficiency. */
+#define FIEMAP_EXTENT_SHARED		0x00002000 /* Space shared with other
+						    * files. */
 
 #endif /* _LINUX_FIEMAP_H */
diff --git a/misc/filefrag.c b/misc/filefrag.c
index 35b3544..31dfb64 100644
--- a/misc/filefrag.c
+++ b/misc/filefrag.c
@@ -165,6 +165,8 @@ static void print_extent_info(struct fiemap_extent *fm_extent, int cur_ex,
 		strcat(flags, "unwritten,");
 	if (fm_extent->fe_flags & FIEMAP_EXTENT_MERGED)
 		strcat(flags, "merged,");
+	if (fm_extent->fe_flags & FIEMAP_EXTENT_SHARED)
+		strcat(flags, "shared,");
 
 	if (fm_extent->fe_logical + fm_extent->fe_length >= (__u64) st->st_size)
 		strcat(flags, "eof,");
-- 
1.7.7