diff --git a/libc/include/sys/mount.h b/libc/include/sys/mount.h
index 207527e..3c35d31 100644
--- a/libc/include/sys/mount.h
+++ b/libc/include/sys/mount.h
@@ -30,75 +30,18 @@
 
 #include <sys/cdefs.h>
 #include <sys/ioctl.h>
+#include <linux/fs.h>
 
 __BEGIN_DECLS
 
-/*
- * These are the fs-independent mount-flags: up to 32 flags are supported
- */
-#define MS_RDONLY        1      /* Mount read-only */
-#define MS_NOSUID        2      /* Ignore suid and sgid bits */
-#define MS_NODEV         4      /* Disallow access to device special files */
-#define MS_NOEXEC        8      /* Disallow program execution */
-#define MS_SYNCHRONOUS  16      /* Writes are synced at once */
-#define MS_REMOUNT      32      /* Alter flags of a mounted FS */
-#define MS_MANDLOCK     64      /* Allow mandatory locks on an FS */
-#define MS_DIRSYNC      128     /* Directory modifications are synchronous */
-#define MS_NOATIME      1024    /* Do not update access times. */
-#define MS_NODIRATIME   2048    /* Do not update directory access times */
-#define MS_BIND         4096
-#define MS_MOVE         8192
-#define MS_REC          16384
-#define MS_VERBOSE      32768
-#define MS_POSIXACL     (1<<16) /* VFS does not apply the umask */
-#define MS_UNBINDABLE   (1<<17) /* change to unbindable */
-#define MS_PRIVATE      (1<<18) /* change to private */
-#define MS_SLAVE        (1<<19) /* change to slave */
-#define MS_SHARED       (1<<20) /* change to shared */
-#define MS_ACTIVE       (1<<30)
-#define MS_NOUSER       (1<<31)
-
-/*
- * Superblock flags that can be altered by MS_REMOUNT
- */
-#define MS_RMT_MASK     (MS_RDONLY|MS_SYNCHRONOUS|MS_MANDLOCK|MS_NOATIME|MS_NODIRATIME)
-
-/*
- * Old magic mount flag and mask
- */
-#define MS_MGC_VAL 0xC0ED0000
-#define MS_MGC_MSK 0xffff0000
-
-/*
- * umount2() flags
- */
+/* umount2 flags. */
 #define MNT_FORCE	1	/* Forcibly unmount */
 #define MNT_DETACH	2	/* Detach from tree only */
 #define MNT_EXPIRE	4	/* Mark for expiry */
 
-/*
- * Block device ioctls
- */
-#define BLKROSET   _IO(0x12, 93) /* Set device read-only (0 = read-write).  */
-#define BLKROGET   _IO(0x12, 94) /* Get read-only status (0 = read_write).  */
-#define BLKRRPART  _IO(0x12, 95) /* Re-read partition table.  */
-#define BLKGETSIZE _IO(0x12, 96) /* Return device size.  */
-#define BLKFLSBUF  _IO(0x12, 97) /* Flush buffer cache.  */
-#define BLKRASET   _IO(0x12, 98) /* Set read ahead for block device.  */
-#define BLKRAGET   _IO(0x12, 99) /* Get current read ahead setting.  */
-
-/*
- * Prototypes
- */
-extern int mount(const char *, const char *,
-		   const char *, unsigned long,
-		   const void *);
-extern int umount(const char *);
-extern int umount2(const char *, int);
-
-#if 0 /* MISSING FROM BIONIC */
-extern int pivot_root(const char *, const char *);
-#endif /* MISSING */
+extern int mount(const char*, const char*, const char*, unsigned long, const void*);
+extern int umount(const char*);
+extern int umount2(const char*, int);
 
 __END_DECLS