tools headers uapi: Sync linux/fcntl.h with the kernel sources

To get the changes in:

  96b2b072ee62be8a ("exportfs: allow exporting non-decodeable file handles to userspace")

That don't add anything that is handled by existing hard coded tables or
table generation scripts.

This silences this perf build warning:

  Warning: Kernel ABI header differences:
    diff -u tools/include/uapi/linux/fcntl.h include/uapi/linux/fcntl.h

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Amir Goldstein <amir73il@gmail.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lore.kernel.org/lkml/ZK11P5AwRBUxxutI@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/include/uapi/linux/fcntl.h b/tools/include/uapi/linux/fcntl.h
index e8c07da58c9f20ed3b7b4aa886f964d335fa41d2..6c80f96049bd07d1aa527c103acb07fe52bfd617 100644 (file)
--- a/tools/include/uapi/linux/fcntl.h
+++ b/tools/include/uapi/linux/fcntl.h
@@ -112,4 +112,9 @@
 
 #define AT_RECURSIVE           0x8000  /* Apply to the entire subtree */
 
+/* Flags for name_to_handle_at(2). We reuse AT_ flag space to save bits... */
+#define AT_HANDLE_FID          AT_REMOVEDIR    /* file handle is needed to
+                                       compare object identity and may not
+                                       be usable to open_by_handle_at(2) */
+
 #endif /* _UAPI_LINUX_FCNTL_H */