3 files changed, 51 insertions, 1 deletions

diff --git a/fs/overlayfs/inode.c b/fs/overlayfs/inode.c
index d3e65d2a1b83..2a5a38c81961 100644
--- a/fs/overlayfs/inode.c
+++ b/fs/overlayfs/inode.c
@@ -145,6 +145,9 @@ int ovl_getattr(const struct path *path, struct kstat *stat,
 	bool samefs = ovl_same_sb(dentry->d_sb);
 	struct ovl_layer *lower_layer = NULL;
 	int err;
+	bool metacopy_blocks = false;
+
+	metacopy_blocks = ovl_is_metacopy_dentry(dentry);
 
 	type = ovl_path_real(dentry, &realpath);
 	old_cred = ovl_override_creds(dentry->d_sb);
@@ -166,7 +169,8 @@ int ovl_getattr(const struct path *path, struct kstat *stat,
 			lower_layer = ovl_layer_lower(dentry);
 		} else if (OVL_TYPE_ORIGIN(type)) {
 			struct kstat lowerstat;
-			u32 lowermask = STATX_INO | (!is_dir ? STATX_NLINK : 0);
+			u32 lowermask = STATX_INO | STATX_BLOCKS |
+					(!is_dir ? STATX_NLINK : 0);
 
 			ovl_path_lower(dentry, &realpath);
 			err = vfs_getattr(&realpath, &lowerstat,
@@ -195,6 +199,35 @@ int ovl_getattr(const struct path *path, struct kstat *stat,
 				stat->ino = lowerstat.ino;
 				lower_layer = ovl_layer_lower(dentry);
 			}
+
+			/*
+			 * If we are querying a metacopy dentry and lower
+			 * dentry is data dentry, then use the blocks we
+			 * queried just now. We don't have to do additional
+			 * vfs_getattr(). If lower itself is metacopy, then
+			 * additional vfs_getattr() is unavoidable.
+			 */
+			if (metacopy_blocks &&
+			    realpath.dentry == ovl_dentry_lowerdata(dentry)) {
+				stat->blocks = lowerstat.blocks;
+				metacopy_blocks = false;
+			}
+		}
+
+		if (metacopy_blocks) {
+			/*
+			 * If lower is not same as lowerdata or if there was
+			 * no origin on upper, we can end up here.
+			 */
+			struct kstat lowerdatastat;
+			u32 lowermask = STATX_BLOCKS;
+
+			ovl_path_lowerdata(dentry, &realpath);
+			err = vfs_getattr(&realpath, &lowerdatastat,
+					  lowermask, flags);
+			if (err)
+				goto out;
+			stat->blocks = lowerdatastat.blocks;
 		}
 	}
 
diff --git a/fs/overlayfs/overlayfs.h b/fs/overlayfs/overlayfs.h
index deda94381aac..de80250b379f 100644
--- a/fs/overlayfs/overlayfs.h
+++ b/fs/overlayfs/overlayfs.h
@@ -271,6 +271,7 @@ int ovl_nlink_start(struct dentry *dentry, bool *locked);
 void ovl_nlink_end(struct dentry *dentry, bool locked);
 int ovl_lock_rename_workdir(struct dentry *workdir, struct dentry *upperdir);
 int ovl_check_metacopy_xattr(struct dentry *dentry);
+bool ovl_is_metacopy_dentry(struct dentry *dentry);
 
 static inline bool ovl_is_impuredir(struct dentry *dentry)
 {
diff --git a/fs/overlayfs/util.c b/fs/overlayfs/util.c
index 7c7b95d5da1f..4f9c2ecee74c 100644
--- a/fs/overlayfs/util.c
+++ b/fs/overlayfs/util.c
@@ -825,3 +825,19 @@ out:
 	pr_warn_ratelimited("overlayfs: failed to get metacopy (%i)\n", res);
 	return res;
 }
+
+bool ovl_is_metacopy_dentry(struct dentry *dentry)
+{
+	struct ovl_entry *oe = dentry->d_fsdata;
+
+	if (!d_is_reg(dentry))
+		return false;
+
+	if (ovl_dentry_upper(dentry)) {
+		if (!ovl_has_upperdata(d_inode(dentry)))
+			return true;
+		return false;
+	}
+
+	return (oe->numlower > 1);
+}