btrfs-progs: check/lowmem: Fix false alert of data extent backref lost for snapshot

[platform/upstream/btrfs-progs.git] / cmds-fi-du.c

diff --git a/cmds-fi-du.c b/cmds-fi-du.c
index 4bf6af3..8a44665 100644 (file)
--- a/cmds-fi-du.c
+++ b/cmds-fi-du.c
@@ -433,7 +433,6 @@ static int du_add_file(const char *filename, int dirfd,
        u64 file_total = 0;
        u64 file_shared = 0;
        u64 dir_set_shared = 0;
-       u64 subvol;
        int fd;
        DIR *dirstream = NULL;
 
@@ -462,16 +461,24 @@ static int du_add_file(const char *filename, int dirfd,
                goto out;
        }
 
-       ret = lookup_path_rootid(fd, &subvol);
-       if (ret)
-               goto out_close;
+       /*
+        * If st.st_ino == BTRFS_EMPTY_SUBVOL_DIR_OBJECTID ==2, there is no any
+        * related tree
+        */
+       if (st.st_ino != BTRFS_EMPTY_SUBVOL_DIR_OBJECTID) {
+               u64 subvol;
 
-       if (inode_seen(st.st_ino, subvol))
-               goto out_close;
+               ret = lookup_path_rootid(fd, &subvol);
+               if (ret)
+                       goto out_close;
 
-       ret = mark_inode_seen(st.st_ino, subvol);
-       if (ret)
-               goto out_close;
+               if (inode_seen(st.st_ino, subvol))
+                       goto out_close;
+
+               ret = mark_inode_seen(st.st_ino, subvol);
+               if (ret)
+                       goto out_close;
+       }
 
        if (S_ISREG(st.st_mode)) {
                ret = du_calc_file_space(fd, shared_extents, &file_total,