mount: add definition for FSOPEN_CLOEXEC

A recent change in glibc introduced `enum fsconfig_command` [1] and as a
result the compilation of criu fails with the following errors

In file included from criu/pie/util.c:3:
/usr/include/sys/mount.h:240:6: error: redeclaration of 'enum fsconfig_command'
  240 | enum fsconfig_command
      |      ^~~~~~~~~~~~~~~~
In file included from /usr/include/sys/mount.h:32:
criu/include/linux/mount.h:11:6: note: originally defined here
   11 | enum fsconfig_command {
      |      ^~~~~~~~~~~~~~~~
/usr/include/sys/mount.h:242:3: error: redeclaration of enumerator 'FSCONFIG_SET_FLAG'
  242 |   FSCONFIG_SET_FLAG       = 0,    /* Set parameter, supplying no value */
      |   ^~~~~~~~~~~~~~~~~
criu/include/linux/mount.h:12:9: note: previous definition of 'FSCONFIG_SET_FLAG' with type 'enum fsconfig_command'
   12 |         FSCONFIG_SET_FLAG = 0, /* Set parameter, supplying no value */
      |         ^~~~~~~~~~~~~~~~~
/usr/include/sys/mount.h:244:3: error: redeclaration of enumerator 'FSCONFIG_SET_STRING'
  244 |   FSCONFIG_SET_STRING     = 1,    /* Set parameter, supplying a string value */
      |   ^~~~~~~~~~~~~~~~~~~
criu/include/linux/mount.h:14:9: note: previous definition of 'FSCONFIG_SET_STRING' with type 'enum fsconfig_command'
   14 |         FSCONFIG_SET_STRING = 1, /* Set parameter, supplying a string value */
      |         ^~~~~~~~~~~~~~~~~~~
/usr/include/sys/mount.h:246:3: error: redeclaration of enumerator 'FSCONFIG_SET_BINARY'
  246 |   FSCONFIG_SET_BINARY     = 2,    /* Set parameter, supplying a binary blob value */
      |   ^~~~~~~~~~~~~~~~~~~
criu/include/linux/mount.h:16:9: note: previous definition of 'FSCONFIG_SET_BINARY' with type 'enum fsconfig_command'
   16 |         FSCONFIG_SET_BINARY = 2, /* Set parameter, supplying a binary blob value */
      |         ^~~~~~~~~~~~~~~~~~~
/usr/include/sys/mount.h:248:3: error: redeclaration of enumerator 'FSCONFIG_SET_PATH'
  248 |   FSCONFIG_SET_PATH       = 3,    /* Set parameter, supplying an object by path */
      |   ^~~~~~~~~~~~~~~~~
criu/include/linux/mount.h:18:9: note: previous definition of 'FSCONFIG_SET_PATH' with type 'enum fsconfig_command'
   18 |         FSCONFIG_SET_PATH = 3, /* Set parameter, supplying an object by path */
      |         ^~~~~~~~~~~~~~~~~
/usr/include/sys/mount.h:250:3: error: redeclaration of enumerator 'FSCONFIG_SET_PATH_EMPTY'
  250 |   FSCONFIG_SET_PATH_EMPTY = 4,    /* Set parameter, supplying an object by (empty) path */
      |   ^~~~~~~~~~~~~~~~~~~~~~~
criu/include/linux/mount.h:20:9: note: previous definition of 'FSCONFIG_SET_PATH_EMPTY' with type 'enum fsconfig_command'
   20 |         FSCONFIG_SET_PATH_EMPTY = 4, /* Set parameter, supplying an object by (empty) path */
      |         ^~~~~~~~~~~~~~~~~~~~~~~
/usr/include/sys/mount.h:252:3: error: redeclaration of enumerator 'FSCONFIG_SET_FD'
  252 |   FSCONFIG_SET_FD         = 5,    /* Set parameter, supplying an object by fd */
      |   ^~~~~~~~~~~~~~~
criu/include/linux/mount.h:22:9: note: previous definition of 'FSCONFIG_SET_FD' with type 'enum fsconfig_command'
   22 |         FSCONFIG_SET_FD = 5, /* Set parameter, supplying an object by fd */
      |         ^~~~~~~~~~~~~~~
/usr/include/sys/mount.h:254:3: error: redeclaration of enumerator 'FSCONFIG_CMD_CREATE'
  254 |   FSCONFIG_CMD_CREATE     = 6,    /* Invoke superblock creation */
      |   ^~~~~~~~~~~~~~~~~~~
criu/include/linux/mount.h:24:9: note: previous definition of 'FSCONFIG_CMD_CREATE' with type 'enum fsconfig_command'
   24 |         FSCONFIG_CMD_CREATE = 6, /* Invoke superblock creation */
      |         ^~~~~~~~~~~~~~~~~~~
/usr/include/sys/mount.h:256:3: error: redeclaration of enumerator 'FSCONFIG_CMD_RECONFIGURE'
  256 |   FSCONFIG_CMD_RECONFIGURE = 7,   /* Invoke superblock reconfiguration */
      |   ^~~~~~~~~~~~~~~~~~~~~~~~
criu/include/linux/mount.h:26:9: note: previous definition of 'FSCONFIG_CMD_RECONFIGURE' with type 'enum fsconfig_command'
   26 |         FSCONFIG_CMD_RECONFIGURE = 7, /* Invoke superblock reconfiguration */

This patch adds definition for FSOPEN_CLOEXEC to solve this problem. In particular,
sys/mount.h includes ifndef check for FSOPEN_CLOEXEC surrounding `enum fsconfig_command`.

[1] https://sourceware.org/git/?p=glibc.git;a=commitdiff;h=7eae6a91e9b1670330c9f15730082c91c0b1d570

Reported-by: Younes Manton (@ymanton)
Signed-off-by: Radostin Stoyanov <rstoyanov@fedoraproject.org>

1 files changed, 8 insertions, 2 deletions

diff --git a/criu/include/linux/mount.h b/criu/include/linux/mount.h
index 0d55a588c..fefafa89e 100644
--- a/criu/include/linux/mount.h
+++ b/criu/include/linux/mount.h
@@ -6,7 +6,7 @@
 
 /* Copied from /usr/include/sys/mount.h */
 
-#ifndef FSCONFIG_CMD_CREATE
+#ifndef FSOPEN_CLOEXEC
 /* The type of fsconfig call made.   */
 enum fsconfig_command {
 	FSCONFIG_SET_FLAG = 0, /* Set parameter, supplying no value */
@@ -26,7 +26,13 @@ enum fsconfig_command {
 	FSCONFIG_CMD_RECONFIGURE = 7, /* Invoke superblock reconfiguration */
 #define FSCONFIG_CMD_RECONFIGURE FSCONFIG_CMD_RECONFIGURE
 };
-#endif // FSCONFIG_CMD_CREATE
+
+#endif // FSOPEN_CLOEXEC
+
+/* fsopen flags. With the redundant definition, we check if the kernel,
+ * glibc value and our value still match.
+ */
+#define FSOPEN_CLOEXEC 0x00000001
 
 #ifndef MS_MGC_VAL
 /* Magic mount flag number. Has to be or-ed to the flag values.  */