du: -x should not count files in other file systems

This fixes Bug#10293, which I guess was introduced in commit
95c948b06a dated 2003-10-02.
* NEWS: Document fix.
* src/du.c (process_file): Don't count files in different file
systems if -x is given.
* tests/du/one-file-system: Test for this bug.

1 files changed, 3 insertions, 0 deletions

diff --git a/src/du.c b/src/du.c
index fba7f7d60..a8dfd28f1 100644
--- a/src/du.c
+++ b/src/du.c
@@ -443,6 +443,9 @@ process_file (FTS *fts, FTSENT *ent)
               error (0, ent->fts_errno, _("cannot access %s"), quote (file));
               return false;
             }
+
+          if (fts->fts_options & FTS_XDEV && fts->fts_dev != sb->st_dev)
+            excluded = true;
         }
 
       if (excluded