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Subject[PATCH v2 2/2] uapi: split openat2(2) definitions from fcntl.h
Date
Florian mentioned that glibc doesn't use fcntl.h because it has some
issues with namespace cleanliness, and that we should have a separate
header for openat2(2) if possible. In addition, userspace has no real
use for the OPEN_HOW_SIZE_* constants so move them to the in-kernel
headers.

Suggested-by: Florian Weimer <fweimer@redhat.com>
Signed-off-by: Aleksa Sarai <cyphar@cyphar.com>
---
MAINTAINERS | 1 +
include/linux/fcntl.h | 4 ++++
include/uapi/linux/fcntl.h | 36 +--------------------------------
include/uapi/linux/openat2.h | 39 ++++++++++++++++++++++++++++++++++++
4 files changed, 45 insertions(+), 35 deletions(-)
create mode 100644 include/uapi/linux/openat2.h

diff --git a/MAINTAINERS b/MAINTAINERS
index bd5847e802de..737ada377ac3 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -6397,6 +6397,7 @@ F: fs/*
F: include/linux/fs.h
F: include/linux/fs_types.h
F: include/uapi/linux/fs.h
+F: include/uapi/linux/openat2.h

FINTEK F75375S HARDWARE MONITOR AND FAN CONTROLLER DRIVER
M: Riku Voipio <riku.voipio@iki.fi>
diff --git a/include/linux/fcntl.h b/include/linux/fcntl.h
index f2eb05bd3af3..7bcdcf4f6ab2 100644
--- a/include/linux/fcntl.h
+++ b/include/linux/fcntl.h
@@ -21,6 +21,10 @@
(RESOLVE_NO_XDEV | RESOLVE_NO_MAGICLINKS | RESOLVE_NO_SYMLINKS | \
RESOLVE_BENEATH | RESOLVE_IN_ROOT)

+/* List of all open_how "versions". */
+#define OPEN_HOW_SIZE_VER0 24 /* sizeof first published struct */
+#define OPEN_HOW_SIZE_LATEST OPEN_HOW_SIZE_VER0
+
#ifndef force_o_largefile
#define force_o_largefile() (!IS_ENABLED(CONFIG_ARCH_32BIT_OFF_T))
#endif
diff --git a/include/uapi/linux/fcntl.h b/include/uapi/linux/fcntl.h
index 5aaadfd79dd5..ca88b7bce553 100644
--- a/include/uapi/linux/fcntl.h
+++ b/include/uapi/linux/fcntl.h
@@ -3,6 +3,7 @@
#define _UAPI_LINUX_FCNTL_H

#include <asm/fcntl.h>
+#include <linux/openat2.h>

#define F_SETLEASE (F_LINUX_SPECIFIC_BASE + 0)
#define F_GETLEASE (F_LINUX_SPECIFIC_BASE + 1)
@@ -100,39 +101,4 @@

#define AT_RECURSIVE 0x8000 /* Apply to the entire subtree */

-/*
- * Arguments for how openat2(2) should open the target path. If only @flags and
- * @mode are non-zero, then openat2(2) operates very similarly to openat(2).
- *
- * However, unlike openat(2), unknown or invalid bits in @flags result in
- * -EINVAL rather than being silently ignored. @mode must be zero unless one of
- * {O_CREAT, O_TMPFILE} are set.
- *
- * @flags: O_* flags.
- * @mode: O_CREAT/O_TMPFILE file mode.
- * @resolve: RESOLVE_* flags.
- */
-struct open_how {
- __u64 flags;
- __u64 mode;
- __u64 resolve;
-};
-
-#define OPEN_HOW_SIZE_VER0 24 /* sizeof first published struct */
-#define OPEN_HOW_SIZE_LATEST OPEN_HOW_SIZE_VER0
-
-/* how->resolve flags for openat2(2). */
-#define RESOLVE_NO_XDEV 0x01 /* Block mount-point crossings
- (includes bind-mounts). */
-#define RESOLVE_NO_MAGICLINKS 0x02 /* Block traversal through procfs-style
- "magic-links". */
-#define RESOLVE_NO_SYMLINKS 0x04 /* Block traversal through all symlinks
- (implies OEXT_NO_MAGICLINKS) */
-#define RESOLVE_BENEATH 0x08 /* Block "lexical" trickery like
- "..", symlinks, and absolute
- paths which escape the dirfd. */
-#define RESOLVE_IN_ROOT 0x10 /* Make all jumps to "/" and ".."
- be scoped inside the dirfd
- (similar to chroot(2)). */
-
#endif /* _UAPI_LINUX_FCNTL_H */
diff --git a/include/uapi/linux/openat2.h b/include/uapi/linux/openat2.h
new file mode 100644
index 000000000000..58b1eb711360
--- /dev/null
+++ b/include/uapi/linux/openat2.h
@@ -0,0 +1,39 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+#ifndef _UAPI_LINUX_OPENAT2_H
+#define _UAPI_LINUX_OPENAT2_H
+
+#include <linux/types.h>
+
+/*
+ * Arguments for how openat2(2) should open the target path. If only @flags and
+ * @mode are non-zero, then openat2(2) operates very similarly to openat(2).
+ *
+ * However, unlike openat(2), unknown or invalid bits in @flags result in
+ * -EINVAL rather than being silently ignored. @mode must be zero unless one of
+ * {O_CREAT, O_TMPFILE} are set.
+ *
+ * @flags: O_* flags.
+ * @mode: O_CREAT/O_TMPFILE file mode.
+ * @resolve: RESOLVE_* flags.
+ */
+struct open_how {
+ __u64 flags;
+ __u64 mode;
+ __u64 resolve;
+};
+
+/* how->resolve flags for openat2(2). */
+#define RESOLVE_NO_XDEV 0x01 /* Block mount-point crossings
+ (includes bind-mounts). */
+#define RESOLVE_NO_MAGICLINKS 0x02 /* Block traversal through procfs-style
+ "magic-links". */
+#define RESOLVE_NO_SYMLINKS 0x04 /* Block traversal through all symlinks
+ (implies OEXT_NO_MAGICLINKS) */
+#define RESOLVE_BENEATH 0x08 /* Block "lexical" trickery like
+ "..", symlinks, and absolute
+ paths which escape the dirfd. */
+#define RESOLVE_IN_ROOT 0x10 /* Make all jumps to "/" and ".."
+ be scoped inside the dirfd
+ (similar to chroot(2)). */
+
+#endif /* _UAPI_LINUX_OPENAT2_H */
--
2.24.0
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