mount: Move fstypes related code into separate files

After this the mount.c is no longer the fattest .c in the tree:

  - before
    3947 criu/mount.c
    3179 criu/cr-restore.c
    2622 criu/proc_parse.c
    2095 criu/tty.c

  - after
    3179 criu/cr-restore.c
    3170 criu/mount.c
    2623 criu/proc_parse.c
    2095 criu/tty.c

One "not move" thing is -- since fstype array is static to the
filesystems.c and mount.c needs to access fstype[1] for auto
mounts, the fstype_auto() call is added.
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

criu/Makefile.crtools

@@ -35,6 +35,7 @@ obj-y			+= log.o
 obj-y			+= lsm.o
 obj-y			+= mem.o
 obj-y			+= mount.o
+obj-y			+= filesystems.o
 obj-y			+= namespaces.o
 obj-y			+= netfilter.o
 obj-y			+= net.o

criu/cr-service.c

@@ -28,6 +28,7 @@
 #include "page-xfer.h"
 #include "net.h"
 #include "mount.h"
+#include "filesystems.h"
 #include "cgroup.h"
 #include "cgroup-props.h"
 #include "action-scripts.h"

criu/crtools.c

@@ -37,6 +37,7 @@
 #include "cr-service.h"
 #include "plugin.h"
 #include "mount.h"
+#include "filesystems.h"
 #include "namespaces.h"
 #include "cgroup.h"
 #include "cgroup-props.h"

criu/fsnotify.c

@@ -28,6 +28,7 @@
 #include "fsnotify.h"
 #include "fdinfo.h"
 #include "mount.h"
+#include "filesystems.h"
 #include "image.h"
 #include "util.h"
 #include "files.h"

criu/include/filesystems.h

+#ifndef __CR_FILESYSTEMS_H__
+#define __CR_FILESYSTEMS_H__
+extern struct fstype *find_fstype_by_name(char *fst);
+extern struct fstype *decode_fstype(u32 fst);
+extern bool add_fsname_auto(const char *names);
+
+struct mount_info;
+typedef int (*mount_fn_t)(struct mount_info *mi, const char *src, const
+			  char *fstype, unsigned long mountflags);
+
+struct fstype {
+	char *name;
+	int code;
+	int (*dump)(struct mount_info *pm);
+	int (*restore)(struct mount_info *pm);
+	int (*parse)(struct mount_info *pm);
+	mount_fn_t mount;
+};
+
+extern struct fstype *fstype_auto(void);
+
+/* callback for AUFS support */
+extern int aufs_parse(struct mount_info *mi);
+
+/* callback for OverlayFS support */
+extern int overlayfs_parse(struct mount_info *mi);
+
+/* FIXME -- remove */
+extern struct list_head binfmt_misc_list;
+#endif

criu/include/mount.h

@@ -102,8 +102,7 @@ extern struct ns_id *lookup_nsid_by_mnt_id(int mnt_id);
 
 extern int open_mount(unsigned int s_dev);
 extern int __open_mountpoint(struct mount_info *pm, int mnt_fd);
-extern struct fstype *find_fstype_by_name(char *fst);
-extern bool add_fsname_auto(const char *names);
+extern int open_mountpoint(struct mount_info *pm);
 
 extern struct mount_info *collect_mntinfo(struct ns_id *ns, bool for_dump);
 extern int prepare_mnt_ns(void);
@@ -130,29 +129,10 @@ extern int read_mnt_ns_img(void);
 extern void cleanup_mnt_ns(void);
 extern void clean_cr_time_mounts(void);
 
-struct mount_info;
-typedef int (*mount_fn_t)(struct mount_info *mi, const char *src, const
-			  char *fstype, unsigned long mountflags);
-
-struct fstype {
-	char *name;
-	int code;
-	int (*dump)(struct mount_info *pm);
-	int (*restore)(struct mount_info *pm);
-	int (*parse)(struct mount_info *pm);
-	mount_fn_t mount;
-};
-
 extern bool add_skip_mount(const char *mountpoint);
 struct ns_id;
 extern struct mount_info *parse_mountinfo(pid_t pid, struct ns_id *nsid, bool for_dump);
 
-/* callback for AUFS support */
-extern int aufs_parse(struct mount_info *mi);
-
-/* callback for OverlayFS support */
-extern int overlayfs_parse(struct mount_info *mi);
-
 extern int check_mnt_id(void);
 
 #endif /* __CR_MOUNT_H__ */

criu/proc_parse.c

@@ -14,6 +14,7 @@
 #include "list.h"
 #include "util.h"
 #include "mount.h"
+#include "filesystems.h"
 #include "mman.h"
 #include "cpu.h"
 #include "file-lock.h"