diff --git a/libc/SYSCALLS.TXT b/libc/SYSCALLS.TXT
index 4bcccb5..baac5d0 100644
--- a/libc/SYSCALLS.TXT
+++ b/libc/SYSCALLS.TXT
@@ -118,6 +118,7 @@
 int         ftruncate(int, off_t)  93
 int         getdents:getdents64(unsigned int, struct dirent *, unsigned int)   217,220
 int         fsync(int)  118
+int         fdatasync(int) 148
 int         fchown:fchown32(int, uid_t, gid_t)  207
 void        sync(void)  36
 int         __fcntl64:fcntl64(int, int, void *)  221
diff --git a/libc/arch-arm/syscalls.mk b/libc/arch-arm/syscalls.mk
index 2d944ca..f1d8fb1 100644
--- a/libc/arch-arm/syscalls.mk
+++ b/libc/arch-arm/syscalls.mk
@@ -72,6 +72,7 @@
 syscall_src += arch-arm/syscalls/ftruncate.S
 syscall_src += arch-arm/syscalls/getdents.S
 syscall_src += arch-arm/syscalls/fsync.S
+syscall_src += arch-arm/syscalls/fdatasync.S
 syscall_src += arch-arm/syscalls/fchown.S
 syscall_src += arch-arm/syscalls/sync.S
 syscall_src += arch-arm/syscalls/__fcntl64.S
diff --git a/libc/arch-arm/syscalls/fdatasync.S b/libc/arch-arm/syscalls/fdatasync.S
new file mode 100644
index 0000000..5981a80
--- /dev/null
+++ b/libc/arch-arm/syscalls/fdatasync.S
@@ -0,0 +1,19 @@
+/* autogenerated by gensyscalls.py */
+#include <sys/linux-syscalls.h>
+
+    .text
+    .type fdatasync, #function
+    .globl fdatasync
+    .align 4
+    .fnstart
+
+fdatasync:
+    .save   {r4, r7}
+    stmfd   sp!, {r4, r7}
+    ldr     r7, =__NR_fdatasync
+    swi     #0
+    ldmfd   sp!, {r4, r7}
+    movs    r0, r0
+    bxpl    lr
+    b       __set_syscall_errno
+    .fnend
diff --git a/libc/arch-sh/syscalls.mk b/libc/arch-sh/syscalls.mk
index b690bbf..3e2274f 100644
--- a/libc/arch-sh/syscalls.mk
+++ b/libc/arch-sh/syscalls.mk
@@ -75,6 +75,7 @@
 syscall_src += arch-sh/syscalls/ftruncate.S
 syscall_src += arch-sh/syscalls/getdents.S
 syscall_src += arch-sh/syscalls/fsync.S
+syscall_src += arch-sh/syscalls/fdatasync.S
 syscall_src += arch-sh/syscalls/fchown.S
 syscall_src += arch-sh/syscalls/sync.S
 syscall_src += arch-sh/syscalls/__fcntl64.S
diff --git a/libc/arch-sh/syscalls/fdatasync.S b/libc/arch-sh/syscalls/fdatasync.S
new file mode 100644
index 0000000..d81c33a
--- /dev/null
+++ b/libc/arch-sh/syscalls/fdatasync.S
@@ -0,0 +1,32 @@
+/* autogenerated by gensyscalls.py */
+#include <sys/linux-syscalls.h>
+
+    .text
+    .type fdatasync, @function
+    .globl fdatasync
+    .align 4
+
+fdatasync:
+
+    /* invoke trap */
+    mov.l   0f, r3  /* trap num */
+    trapa   #(1 + 0x10)
+
+    /* check return value */
+    cmp/pz  r0
+    bt      __NR_fdatasync_end
+
+    /* keep error number */
+    sts.l   pr, @-r15
+    mov.l   1f, r1
+    jsr     @r1
+    mov     r0, r4
+    lds.l   @r15+, pr
+
+__NR_fdatasync_end:
+    rts
+    nop
+
+    .align  2
+0:  .long   __NR_fdatasync
+1:  .long   __set_syscall_errno
diff --git a/libc/arch-x86/syscalls.mk b/libc/arch-x86/syscalls.mk
index 27153f9..f0d7a31 100644
--- a/libc/arch-x86/syscalls.mk
+++ b/libc/arch-x86/syscalls.mk
@@ -75,6 +75,7 @@
 syscall_src += arch-x86/syscalls/ftruncate.S
 syscall_src += arch-x86/syscalls/getdents.S
 syscall_src += arch-x86/syscalls/fsync.S
+syscall_src += arch-x86/syscalls/fdatasync.S
 syscall_src += arch-x86/syscalls/fchown.S
 syscall_src += arch-x86/syscalls/sync.S
 syscall_src += arch-x86/syscalls/__fcntl64.S
diff --git a/libc/arch-x86/syscalls/fdatasync.S b/libc/arch-x86/syscalls/fdatasync.S
new file mode 100644
index 0000000..b86c0f8
--- /dev/null
+++ b/libc/arch-x86/syscalls/fdatasync.S
@@ -0,0 +1,23 @@
+/* autogenerated by gensyscalls.py */
+#include <sys/linux-syscalls.h>
+
+    .text
+    .type fdatasync, @function
+    .globl fdatasync
+    .align 4
+
+fdatasync:
+    pushl   %ebx
+    mov     8(%esp), %ebx
+    movl    $__NR_fdatasync, %eax
+    int     $0x80
+    cmpl    $-129, %eax
+    jb      1f
+    negl    %eax
+    pushl   %eax
+    call    __set_errno
+    addl    $4, %esp
+    orl     $-1, %eax
+1:
+    popl    %ebx
+    ret
diff --git a/libc/include/sys/linux-syscalls.h b/libc/include/sys/linux-syscalls.h
index 6a7fc40..b90f20d 100644
--- a/libc/include/sys/linux-syscalls.h
+++ b/libc/include/sys/linux-syscalls.h
@@ -72,6 +72,7 @@
 #define __NR__newselect                   (__NR_SYSCALL_BASE + 142)
 #define __NR_ftruncate                    (__NR_SYSCALL_BASE + 93)
 #define __NR_fsync                        (__NR_SYSCALL_BASE + 118)
+#define __NR_fdatasync                    (__NR_SYSCALL_BASE + 148)
 #define __NR_fchown32                     (__NR_SYSCALL_BASE + 207)
 #define __NR_sync                         (__NR_SYSCALL_BASE + 36)
 #define __NR_fcntl64                      (__NR_SYSCALL_BASE + 221)
diff --git a/libc/include/sys/linux-unistd.h b/libc/include/sys/linux-unistd.h
index 7494efe..5e9c2f0 100644
--- a/libc/include/sys/linux-unistd.h
+++ b/libc/include/sys/linux-unistd.h
@@ -85,6 +85,7 @@
 int              ftruncate (int, off_t);
 int              getdents (unsigned int, struct dirent *, unsigned int);
 int              fsync (int);
+int              fdatasync (int);
 int              fchown (int, uid_t, gid_t);
 void             sync (void);
 int              __fcntl64 (int, int, void *);