xfs: specify AG in bulk req

Add a new xfs_bulk_ireq flag to constrain the iteration to a single AG.
If the passed-in startino value is zero then we start with the first
inode in the AG that the user passes in; otherwise, we iterate only
within the same AG as the passed-in inode.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Allison Collins <allison.henderson@oracle.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
diff --git a/fs/xfs/xfs_iwalk.h b/fs/xfs/xfs_iwalk.h
index 6746286..6c960e1 100644
--- a/fs/xfs/xfs_iwalk.h
+++ b/fs/xfs/xfs_iwalk.h
@@ -14,10 +14,16 @@ typedef int (*xfs_iwalk_fn)(struct xfs_mount *mp, struct xfs_trans *tp,
 #define XFS_IWALK_ABORT		(XFS_ITER_ABORT)
 
 int xfs_iwalk(struct xfs_mount *mp, struct xfs_trans *tp, xfs_ino_t startino,
-		xfs_iwalk_fn iwalk_fn, unsigned int inode_records, void *data);
+		unsigned int flags, xfs_iwalk_fn iwalk_fn,
+		unsigned int inode_records, void *data);
 int xfs_iwalk_threaded(struct xfs_mount *mp, xfs_ino_t startino,
-		xfs_iwalk_fn iwalk_fn, unsigned int inode_records, bool poll,
-		void *data);
+		unsigned int flags, xfs_iwalk_fn iwalk_fn,
+		unsigned int inode_records, bool poll, void *data);
+
+/* Only iterate inodes within the same AG as @startino. */
+#define XFS_IWALK_SAME_AG	(0x1)
+
+#define XFS_IWALK_FLAGS_ALL	(XFS_IWALK_SAME_AG)
 
 /* Walk all inode btree records in the filesystem starting from @startino. */
 typedef int (*xfs_inobt_walk_fn)(struct xfs_mount *mp, struct xfs_trans *tp,
@@ -28,7 +34,13 @@ typedef int (*xfs_inobt_walk_fn)(struct xfs_mount *mp, struct xfs_trans *tp,
 #define XFS_INOBT_WALK_ABORT	(XFS_IWALK_ABORT)
 
 int xfs_inobt_walk(struct xfs_mount *mp, struct xfs_trans *tp,
-		xfs_ino_t startino, xfs_inobt_walk_fn inobt_walk_fn,
-		unsigned int inobt_records, void *data);
+		xfs_ino_t startino, unsigned int flags,
+		xfs_inobt_walk_fn inobt_walk_fn, unsigned int inobt_records,
+		void *data);
+
+/* Only iterate inobt records within the same AG as @startino. */
+#define XFS_INOBT_WALK_SAME_AG	(XFS_IWALK_SAME_AG)
+
+#define XFS_INOBT_WALK_FLAGS_ALL (XFS_INOBT_WALK_SAME_AG)
 
 #endif /* __XFS_IWALK_H__ */