ext4: support GETFSMAP ioctls
Support the GETFSMAP ioctls so that we can use the xfs free space
management tools to probe ext4 as well. Note that this is a partial
implementation -- we only report fixed-location metadata and free space;
everything else is reported as "unknown".
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
diff --git a/fs/ext4/mballoc.h b/fs/ext4/mballoc.h
index 1aba469..2bed620 100644
--- a/fs/ext4/mballoc.h
+++ b/fs/ext4/mballoc.h
@@ -199,4 +199,21 @@ static inline ext4_fsblk_t ext4_grp_offs_to_block(struct super_block *sb,
return ext4_group_first_block_no(sb, fex->fe_group) +
(fex->fe_start << EXT4_SB(sb)->s_cluster_bits);
}
+
+typedef int (*ext4_mballoc_query_range_fn)(
+ struct super_block *sb,
+ ext4_group_t agno,
+ ext4_grpblk_t start,
+ ext4_grpblk_t len,
+ void *priv);
+
+int
+ext4_mballoc_query_range(
+ struct super_block *sb,
+ ext4_group_t agno,
+ ext4_grpblk_t start,
+ ext4_grpblk_t end,
+ ext4_mballoc_query_range_fn formatter,
+ void *priv);
+
#endif