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-rw-r--r--ChangeLog68
-rw-r--r--NEWS6
-rw-r--r--csu/check_fds.c2
-rw-r--r--include/fcntl.h7
-rw-r--r--io/Makefile3
-rw-r--r--io/Versions5
-rw-r--r--io/fcntl.h11
-rw-r--r--io/fcntl64.c38
-rw-r--r--login/utmp_file.c4
-rw-r--r--manual/llio.texi13
-rw-r--r--nptl/Makefile1
-rw-r--r--sysdeps/generic/not-cancel.h4
-rw-r--r--sysdeps/mach/hurd/bits/errno.h9
-rw-r--r--sysdeps/mach/hurd/fcntl.c5
-rw-r--r--sysdeps/mach/hurd/i386/libc.abilist2
-rw-r--r--sysdeps/posix/fdopendir.c2
-rw-r--r--sysdeps/posix/opendir.c2
-rw-r--r--sysdeps/unix/pt-fcntl.c2
-rw-r--r--sysdeps/unix/sysv/linux/Makefile4
-rw-r--r--sysdeps/unix/sysv/linux/aarch64/libc.abilist1
-rw-r--r--sysdeps/unix/sysv/linux/alpha/libc.abilist1
-rw-r--r--sysdeps/unix/sysv/linux/arm/libc.abilist2
-rw-r--r--sysdeps/unix/sysv/linux/fcntl.c90
-rw-r--r--sysdeps/unix/sysv/linux/fcntl64.c63
-rw-r--r--sysdeps/unix/sysv/linux/fcntl_nocancel.c8
-rw-r--r--sysdeps/unix/sysv/linux/hppa/libc.abilist2
-rw-r--r--sysdeps/unix/sysv/linux/i386/libc.abilist2
-rw-r--r--sysdeps/unix/sysv/linux/ia64/libc.abilist1
-rw-r--r--sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist2
-rw-r--r--sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist2
-rw-r--r--sysdeps/unix/sysv/linux/microblaze/libc.abilist2
-rw-r--r--sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist2
-rw-r--r--sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist2
-rw-r--r--sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist2
-rw-r--r--sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist1
-rw-r--r--sysdeps/unix/sysv/linux/nios2/libc.abilist2
-rw-r--r--sysdeps/unix/sysv/linux/not-cancel.h4
-rw-r--r--sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist2
-rw-r--r--sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist2
-rw-r--r--sysdeps/unix/sysv/linux/powerpc/powerpc64/libc-le.abilist1
-rw-r--r--sysdeps/unix/sysv/linux/powerpc/powerpc64/libc.abilist1
-rw-r--r--sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist1
-rw-r--r--sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist2
-rw-r--r--sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist1
-rw-r--r--sysdeps/unix/sysv/linux/sh/libc.abilist2
-rw-r--r--sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist2
-rw-r--r--sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist1
-rw-r--r--sysdeps/unix/sysv/linux/tst-ofdlocks-compat.c84
-rw-r--r--sysdeps/unix/sysv/linux/tst-ofdlocks.c76
-rw-r--r--sysdeps/unix/sysv/linux/x86_64/64/libc.abilist1
-rw-r--r--sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist1
51 files changed, 519 insertions, 35 deletions
diff --git a/ChangeLog b/ChangeLog
index eaee727677..2eeeabf2ad 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,71 @@
+2018-06-26  Adhemerval Zanella  <adhemerval.zanella@linaro.org>
+
+	[BZ #20251]
+	* NEWS: Mention fcntl64 addition.
+	* csu/check_fds.c: Replace __fcntl_nocancel by __fcntl64_nocancel.
+	* login/utmp_file.c: Likewise.
+	* sysdeps/posix/fdopendir.c: Likewise.
+	* sysdeps/posix/opendir.c: Likewise.
+	* sysdeps/unix/pt-fcntl.c: Likewise.
+	* include/fcntl.h (__libc_fcntl64, __fcntl64,
+	__fcntl64_nocancel_adjusted): New prototype.
+	(__fcntl_nocancel_adjusted): Remove prototype.
+	* io/Makefile (routines): Add fcntl64.
+	(CFLAGS-fcntl64.c): New rule.
+	* io/Versions [GLIBC_2.28] (fcntl64): New symbol.
+	[GLIBC_PRIVATE] (__libc_fcntl): Rename to __libc_fcntl64.
+	* io/fcntl.h (fcntl64): Add prototype and redirect if
+	__USE_FILE_OFFSET64 is defined.
+	* io/fcntl64.c: New file.
+	* manual/llio.text: Add a note for which commands fcntl acts a
+	cancellation point.
+	* nptl/Makefile (CFLAGS-fcntl64.c): New rule.
+	* sysdeps/mach/hurd/fcntl.c: Alias fcntl to fcntl64 symbols.
+	* sysdeps/mach/hurd/i386/libc.abilist [GLIBC_2.28] (fcntl, fcntl64):
+	New symbols.
+	* sysdeps/unix/sysv/linux/fcntl.c (__libc_fcntl): Fix F_GETLK64,
+	F_OFD_GETLK, F_SETLK64, F_SETLKW64, F_OFD_SETLK, and F_OFD_SETLKW for
+	non-LFS case.
+	* sysdeps/unix/sysv/linux/fcntl64.c: New file.
+	* sysdeps/unix/sysv/linux/fcntl_nocancel.c (__fcntl_nocancel): Rename
+	to __fcntl64_nocancel.
+	(__fcntl_nocancel_adjusted): Rename to __fcntl64_nocancel_adjusted.
+	* sysdeps/unix/sysv/linux/not-cancel.h (__fcntl_nocancel): Rename
+	to __fcntl64_nocancel.
+	* sysdeps/generic/not-cancel.h: Likewise.
+	* sysdeps/unix/sysv/linux/tst-ofdlocks.c: New file.
+	* sysdeps/unix/sysv/linux/Makefile (tests): Add tst-ofdlocks.
+	* sysdeps/unix/sysv/linux/aarch64/libc.abilist [GLIBC_2.28]
+	(fcntl64): New symbol.
+	* sysdeps/unix/sysv/linux/alpha/libc.abilist: Likewise.
+	* sysdeps/unix/sysv/linux/ia64/libc.abilist: Likewise.
+	* sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist: Likewise.
+	* sysdeps/unix/sysv/linux/powerpc/powerpc64/libc.abilist: Likewise.
+	* sysdeps/unix/sysv/linux/powerpc/powerpc64/libc-le.abilist: Likewise.
+	* sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist: Likewise.
+	* sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist: Likewise.
+	* sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist: Likewise.
+	* sysdeps/unix/sysv/linux/x86_64/64/libc.abilist: Likewise.
+	* sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist: Likewise.
+	* sysdeps/unix/sysv/linux/arm/libc.abilist [GLIBC_2.28] (fcntl,
+	fcntl64): Likewise.
+	* sysdeps/unix/sysv/linux/hppa/libc.abilist: Likewise.
+	* sysdeps/unix/sysv/linux/i386/libc.abilis: Likewise.
+	* sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist: Likewise.
+	* sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist: Likewise.
+	* sysdeps/unix/sysv/linux/microblaze/libc.abilist: Likewise.
+	* sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist: Likewise.
+	* sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist: Likewise.
+	* sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist: Likewise.
+	* sysdeps/unix/sysv/linux/nios2/libc.abilist: Likewise.
+	* sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist:
+	Likewise.
+	* sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist:
+	Likewise.
+	* sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist: Likewise.
+	* sysdeps/unix/sysv/linux/sh/libc.abilist: Likewise.
+	* sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist: Likewise.
+
 2018-06-26  Florian Weimer  <fweimer@redhat.com>
 
 	Run thread shutdown functions in an explicit order.
diff --git a/NEWS b/NEWS
index db7c1291fd..9d6fc08eb3 100644
--- a/NEWS
+++ b/NEWS
@@ -110,6 +110,12 @@ Deprecated and removed features, and other changes affecting compatibility:
   restriction (rejecting '_' in host names, among other things) has been
   removed, for increased compatibility with non-IDN name resolution.
 
+* The fcntl function now have a Long File Support variant named fcntl64.  It
+  is added to fix some Linux Open File Description (OFD) locks usage on non
+  LFS mode.  As for others *64 functions, fcntl64 semantics are analogous with
+  fcntl and LFS support is handled transparently.  Also for Linux, the OFD
+  locks act as a cancellation entrypoint.
+
 Changes to build and runtime requirements:
 
   [Add changes to build and runtime requirements here]
diff --git a/csu/check_fds.c b/csu/check_fds.c
index 605ee4f3f4..ad1763b398 100644
--- a/csu/check_fds.c
+++ b/csu/check_fds.c
@@ -39,7 +39,7 @@
 static void
 check_one_fd (int fd, int mode)
 {
-  if (__builtin_expect (__fcntl_nocancel (fd, F_GETFD), 0) == -1
+  if (__builtin_expect (__fcntl64_nocancel (fd, F_GETFD), 0) == -1
       && errno == EBADF)
     {
       const char *name;
diff --git a/include/fcntl.h b/include/fcntl.h
index 966f797890..be435047bc 100644
--- a/include/fcntl.h
+++ b/include/fcntl.h
@@ -10,11 +10,16 @@ extern int __libc_open (const char *file, int oflag, ...);
 libc_hidden_proto (__libc_open)
 extern int __libc_fcntl (int fd, int cmd, ...);
 libc_hidden_proto (__libc_fcntl)
-extern int __fcntl_nocancel_adjusted (int fd, int cmd, void *arg) attribute_hidden;
+extern int __fcntl64_nocancel_adjusted (int fd, int cmd, void *arg)
+   attribute_hidden;
+extern int __libc_fcntl64 (int fd, int cmd, ...);
+libc_hidden_proto (__libc_fcntl64)
 extern int __open (const char *__file, int __oflag, ...);
 libc_hidden_proto (__open)
 extern int __fcntl (int __fd, int __cmd, ...);
 libc_hidden_proto (__fcntl)
+extern int __fcntl64 (int __fd, int __cmd, ...) attribute_hidden;
+libc_hidden_proto (__fcntl64)
 extern int __openat (int __fd, const char *__file, int __oflag, ...)
   __nonnull ((2));
 libc_hidden_proto (__openat)
diff --git a/io/Makefile b/io/Makefile
index 2117cb6b62..4a0d8fea09 100644
--- a/io/Makefile
+++ b/io/Makefile
@@ -40,7 +40,7 @@ routines :=								\
 	mkdir mkdirat							\
 	open open_2 open64 open64_2 openat openat_2 openat64 openat64_2	\
 	read write lseek lseek64 access euidaccess faccessat		\
-	fcntl flock lockf lockf64					\
+	fcntl fcntl64 flock lockf lockf64				\
 	close dup dup2 dup3 pipe pipe2					\
 	creat creat64							\
 	chdir fchdir							\
@@ -89,6 +89,7 @@ CFLAGS-open64.c += -fexceptions -fasynchronous-unwind-tables
 CFLAGS-creat.c += -fexceptions -fasynchronous-unwind-tables
 CFLAGS-creat64.c += -fexceptions -fasynchronous-unwind-tables
 CFLAGS-fcntl.c += -fexceptions -fasynchronous-unwind-tables
+CFLAGS-fcntl64.c += -fexceptions -fasynchronous-unwind-tables
 CFLAGS-poll.c += -fexceptions -fasynchronous-unwind-tables
 CFLAGS-ppoll.c += -fexceptions -fasynchronous-unwind-tables
 CFLAGS-lockf.c += -fexceptions
diff --git a/io/Versions b/io/Versions
index 4448b7197c..98037fbbfc 100644
--- a/io/Versions
+++ b/io/Versions
@@ -128,8 +128,11 @@ libc {
   GLIBC_2.27 {
     copy_file_range;
   }
+  GLIBC_2.28 {
+    fcntl64;
+  }
   GLIBC_PRIVATE {
-    __libc_fcntl;
+    __libc_fcntl64;
     __fcntl_nocancel;
     __open64_nocancel;
     __write_nocancel;
diff --git a/io/fcntl.h b/io/fcntl.h
index 69a4394191..3afc62011a 100644
--- a/io/fcntl.h
+++ b/io/fcntl.h
@@ -167,7 +167,18 @@ typedef __pid_t pid_t;
 
    This function is a cancellation point and therefore not marked with
    __THROW.  */
+#ifndef __USE_FILE_OFFSET64
 extern int fcntl (int __fd, int __cmd, ...);
+#else
+# ifdef __REDIRECT
+extern int __REDIRECT (fcntl, (int __fd, int __cmd, ...), fcntl64);
+# else
+#  define fcntl fcntl64
+# endif
+#endif
+#ifdef __USE_LARGEFILE64
+extern int fcntl64 (int __fd, int __cmd, ...);
+#endif
 
 /* Open FILE and return a new file descriptor for it, or -1 on error.
    OFLAG determines the type of access used.  If O_CREAT or O_TMPFILE is set
diff --git a/io/fcntl64.c b/io/fcntl64.c
new file mode 100644
index 0000000000..f4e6809abc
--- /dev/null
+++ b/io/fcntl64.c
@@ -0,0 +1,38 @@
+/* Manipulate file descriptor.  Stub LFS version.
+   Copyright (C) 2018 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <errno.h>
+#include <fcntl.h>
+
+/* Perform file control operations on FD.  */
+int
+__fcntl64 (int fd, int cmd, ...)
+{
+  if (fd < 0)
+    {
+      __set_errno (EBADF);
+      return -1;
+    }
+
+  __set_errno (ENOSYS);
+  return -1;
+}
+libc_hidden_def (__fcntl64)
+stub_warning (fcntl64)
+
+weak_alias (__fcntl64, fcntl64)
diff --git a/login/utmp_file.c b/login/utmp_file.c
index 72dd21387c..040a505711 100644
--- a/login/utmp_file.c
+++ b/login/utmp_file.c
@@ -82,7 +82,7 @@ static void timeout_handler (int signum) {};
   memset (&fl, '\0', sizeof (struct flock));				      \
   fl.l_type = (type);							      \
   fl.l_whence = SEEK_SET;						      \
-  if (__fcntl_nocancel ((fd), F_SETLKW, &fl) < 0)
+  if (__fcntl64_nocancel ((fd), F_SETLKW, &fl) < 0)
 
 #define LOCKING_FAILED() \
   goto unalarm_return
@@ -90,7 +90,7 @@ static void timeout_handler (int signum) {};
 #define UNLOCK_FILE(fd) \
   /* Unlock the file.  */						      \
   fl.l_type = F_UNLCK;							      \
-  __fcntl_nocancel ((fd), F_SETLKW, &fl);				      \
+  __fcntl64_nocancel ((fd), F_SETLKW, &fl);				      \
 									      \
  unalarm_return:							      \
   /* Reset the signal handler and alarm.  We must reset the alarm	      \
diff --git a/manual/llio.texi b/manual/llio.texi
index 82f03be2be..e840c55f86 100644
--- a/manual/llio.texi
+++ b/manual/llio.texi
@@ -3281,12 +3281,13 @@ Set process or process group ID to receive @code{SIGIO} signals.
 @xref{Interrupt Input}.
 @end vtable
 
-This function is a cancellation point in multi-threaded programs.  This
-is a problem if the thread allocates some resources (like memory, file
-descriptors, semaphores or whatever) at the time @code{fcntl} is
-called.  If the thread gets canceled these resources stay allocated
-until the program ends.  To avoid this calls to @code{fcntl} should be
-protected using cancellation handlers.
+This function is a cancellation point in multi-threaded programs for the
+commands @code{F_SETLKW} (and the LFS analogous @code{F_SETLKW64}) and
+@code {F_OFD_SETLKW}.  This is a problem if the thread allocates some
+resources (like memory, file descriptors, semaphores or whatever) at the time
+@code{fcntl} is called.  If the thread gets canceled these resources stay
+allocated until the program ends.  To avoid this calls to @code{fcntl} should
+be protected using cancellation handlers.
 @c ref pthread_cleanup_push / pthread_cleanup_pop
 @end deftypefun
 
diff --git a/nptl/Makefile b/nptl/Makefile
index 6cfc8c60ee..0f9c44afa0 100644
--- a/nptl/Makefile
+++ b/nptl/Makefile
@@ -191,6 +191,7 @@ CFLAGS-sem_timedwait.c += -fexceptions -fasynchronous-unwind-tables
 
 # These are the function wrappers we have to duplicate here.
 CFLAGS-fcntl.c += -fexceptions -fasynchronous-unwind-tables
+CFLAGS-fcntl64.c += -fexceptions -fasynchronous-unwind-tables
 CFLAGS-lockf.c += -fexceptions
 CFLAGS-pread.c += -fexceptions -fasynchronous-unwind-tables
 CFLAGS-pread64.c += -fexceptions -fasynchronous-unwind-tables
diff --git a/sysdeps/generic/not-cancel.h b/sysdeps/generic/not-cancel.h
index 19ad8cbc4c..d9f8a75dbd 100644
--- a/sysdeps/generic/not-cancel.h
+++ b/sysdeps/generic/not-cancel.h
@@ -51,7 +51,7 @@
   __pause ()
 #define __nanosleep_nocancel(requested_time, remaining) \
   __nanosleep (requested_time, remaining)
-#define __fcntl_nocancel(fd, cmd, ...) \
-  __fcntl (fd, cmd, __VA_ARGS__)
+#define __fcntl64_nocancel(fd, cmd, ...) \
+  __fcntl64 (fd, cmd, __VA_ARGS__)
 
 #endif /* NOT_CANCEL_H  */
diff --git a/sysdeps/mach/hurd/bits/errno.h b/sysdeps/mach/hurd/bits/errno.h
index 8096fb9c05..bb8b8b669f 100644
--- a/sysdeps/mach/hurd/bits/errno.h
+++ b/sysdeps/mach/hurd/bits/errno.h
@@ -1,9 +1,18 @@
 /* This file generated by errnos.awk from
      errno.texi
+     stdc-predef.h
+     libc-symbols.h
      mach/message.h
      mach/kern_return.h
+     mach/i386/kern_return.h
+     mach/port.h
+     mach/boolean.h
+     mach/i386/boolean.h
+     mach/i386/vm_types.h
      mach/mig_errors.h
      device/device_types.h
+     mach/std_types.h
+     /home/azanella/Projects/glibc/build/i686-gnu/errnos.d
    Do not edit this file; edit errnos.awk and regenerate it.  */
 
 #ifndef _BITS_ERRNO_H
diff --git a/sysdeps/mach/hurd/fcntl.c b/sysdeps/mach/hurd/fcntl.c
index 0b231645c5..598317d811 100644
--- a/sysdeps/mach/hurd/fcntl.c
+++ b/sysdeps/mach/hurd/fcntl.c
@@ -210,3 +210,8 @@ libc_hidden_def (__libc_fcntl)
 weak_alias (__libc_fcntl, __fcntl)
 libc_hidden_weak (__fcntl)
 weak_alias (__libc_fcntl, fcntl)
+
+strong_alias (__libc_fcntl, __libc_fcntl64)
+libc_hidden_def (__libc_fcntl64)
+weak_alias (__libc_fcntl64, __fcntl64)
+libc_hidden_weak (__fcntl64)
diff --git a/sysdeps/mach/hurd/i386/libc.abilist b/sysdeps/mach/hurd/i386/libc.abilist
index 2cb507052b..3d46de795d 100644
--- a/sysdeps/mach/hurd/i386/libc.abilist
+++ b/sysdeps/mach/hurd/i386/libc.abilist
@@ -2033,6 +2033,8 @@ GLIBC_2.27 wcstof64 F
 GLIBC_2.27 wcstof64_l F
 GLIBC_2.27 wcstof64x F
 GLIBC_2.27 wcstof64x_l F
+GLIBC_2.28 fcntl F
+GLIBC_2.28 fcntl64 F
 GLIBC_2.3 __ctype_b_loc F
 GLIBC_2.3 __ctype_tolower_loc F
 GLIBC_2.3 __ctype_toupper_loc F
diff --git a/sysdeps/posix/fdopendir.c b/sysdeps/posix/fdopendir.c
index dafb5d20c1..b72eecc66b 100644
--- a/sysdeps/posix/fdopendir.c
+++ b/sysdeps/posix/fdopendir.c
@@ -38,7 +38,7 @@ __fdopendir (int fd)
     }
 
   /* Make sure the descriptor allows for reading.  */
-  int flags = __fcntl_nocancel (fd, F_GETFL);
+  int flags = __fcntl64_nocancel (fd, F_GETFL);
   if (__glibc_unlikely (flags == -1))
     return NULL;
   if (__glibc_unlikely ((flags & O_ACCMODE) == O_WRONLY))
diff --git a/sysdeps/posix/opendir.c b/sysdeps/posix/opendir.c
index 0875385f65..bb6bd7cc85 100644
--- a/sysdeps/posix/opendir.c
+++ b/sysdeps/posix/opendir.c
@@ -99,7 +99,7 @@ __alloc_dir (int fd, bool close_fd, int flags, const struct stat64 *statp)
   /* We have to set the close-on-exit flag if the user provided the
      file descriptor.  */
   if (!close_fd
-      && __glibc_unlikely (__fcntl_nocancel (fd, F_SETFD, FD_CLOEXEC) < 0))
+      && __glibc_unlikely (__fcntl64_nocancel (fd, F_SETFD, FD_CLOEXEC) < 0))
 	goto lose;
 
   const size_t default_allocation = (4 * BUFSIZ < sizeof (struct dirent64)
diff --git a/sysdeps/unix/pt-fcntl.c b/sysdeps/unix/pt-fcntl.c
index 8113d52b86..3d64054dd0 100644
--- a/sysdeps/unix/pt-fcntl.c
+++ b/sysdeps/unix/pt-fcntl.c
@@ -37,7 +37,7 @@ fcntl_compat (int fd, int cmd, ...)
   va_start (ap, cmd);
   arg = va_arg (ap, void *);
   va_end (ap);
-  return __libc_fcntl (fd, cmd, arg);
+  return __libc_fcntl64 (fd, cmd, arg);
 }
 
 weak_alias (fcntl_compat, fcntl_alias)
diff --git a/sysdeps/unix/sysv/linux/Makefile b/sysdeps/unix/sysv/linux/Makefile
index 215fd5d136..f71cc39c7e 100644
--- a/sysdeps/unix/sysv/linux/Makefile
+++ b/sysdeps/unix/sysv/linux/Makefile
@@ -45,7 +45,9 @@ sysdep_headers += sys/mount.h sys/acct.h sys/sysctl.h \
 tests += tst-clone tst-clone2 tst-clone3 tst-fanotify tst-personality \
 	 tst-quota tst-sync_file_range tst-sysconf-iov_max tst-ttyname \
 	 test-errno-linux tst-memfd_create tst-mlock2 tst-pkey \
-	 tst-rlimit-infinity
+	 tst-rlimit-infinity tst-ofdlocks
+tests-internal += tst-ofdlocks-compat
+
 
 # Generate the list of SYS_* macros for the system calls (__NR_*
 # macros).  The file syscall-names.list contains all possible system
diff --git a/sysdeps/unix/sysv/linux/aarch64/libc.abilist b/sysdeps/unix/sysv/linux/aarch64/libc.abilist
index 80cdb98e1c..884d0dfa95 100644
--- a/sysdeps/unix/sysv/linux/aarch64/libc.abilist
+++ b/sysdeps/unix/sysv/linux/aarch64/libc.abilist
@@ -2131,3 +2131,4 @@ GLIBC_2.27 wcstof64 F
 GLIBC_2.27 wcstof64_l F
 GLIBC_2.27 wcstof64x F
 GLIBC_2.27 wcstof64x_l F
+GLIBC_2.28 fcntl64 F
diff --git a/sysdeps/unix/sysv/linux/alpha/libc.abilist b/sysdeps/unix/sysv/linux/alpha/libc.abilist
index c761f61c43..28d54b9794 100644
--- a/sysdeps/unix/sysv/linux/alpha/libc.abilist
+++ b/sysdeps/unix/sysv/linux/alpha/libc.abilist
@@ -2026,6 +2026,7 @@ GLIBC_2.27 wcstof64 F
 GLIBC_2.27 wcstof64_l F
 GLIBC_2.27 wcstof64x F
 GLIBC_2.27 wcstof64x_l F
+GLIBC_2.28 fcntl64 F
 GLIBC_2.3 __ctype_b_loc F
 GLIBC_2.3 __ctype_tolower_loc F
 GLIBC_2.3 __ctype_toupper_loc F
diff --git a/sysdeps/unix/sysv/linux/arm/libc.abilist b/sysdeps/unix/sysv/linux/arm/libc.abilist
index 6aa58c3ca7..dfde3bd725 100644
--- a/sysdeps/unix/sysv/linux/arm/libc.abilist
+++ b/sysdeps/unix/sysv/linux/arm/libc.abilist
@@ -115,6 +115,8 @@ GLIBC_2.27 wcstof32x F
 GLIBC_2.27 wcstof32x_l F
 GLIBC_2.27 wcstof64 F
 GLIBC_2.27 wcstof64_l F
+GLIBC_2.28 fcntl F
+GLIBC_2.28 fcntl64 F
 GLIBC_2.4 _Exit F
 GLIBC_2.4 _IO_2_1_stderr_ D 0xa0
 GLIBC_2.4 _IO_2_1_stdin_ D 0xa0
diff --git a/sysdeps/unix/sysv/linux/fcntl.c b/sysdeps/unix/sysv/linux/fcntl.c
index e3992dc9d4..cbab7b401a 100644
--- a/sysdeps/unix/sysv/linux/fcntl.c
+++ b/sysdeps/unix/sysv/linux/fcntl.c
@@ -20,15 +20,12 @@
 #include <stdarg.h>
 #include <errno.h>
 #include <sysdep-cancel.h>
-#include <not-cancel.h>
 
-#ifndef __NR_fcntl64
-# define __NR_fcntl64 __NR_fcntl
-#endif
+#ifndef __OFF_T_MATCHES_OFF64_T
 
-#ifndef FCNTL_ADJUST_CMD
-# define FCNTL_ADJUST_CMD(__cmd) __cmd
-#endif
+# ifndef FCNTL_ADJUST_CMD
+#  define FCNTL_ADJUST_CMD(__cmd) __cmd
+# endif
 
 int
 __libc_fcntl (int fd, int cmd, ...)
@@ -42,13 +39,84 @@ __libc_fcntl (int fd, int cmd, ...)
 
   cmd = FCNTL_ADJUST_CMD (cmd);
 
-  if (cmd == F_SETLKW || cmd == F_SETLKW64)
-    return SYSCALL_CANCEL (fcntl64, fd, cmd, (void *) arg);
-
-  return __fcntl_nocancel_adjusted (fd, cmd, arg);
+  switch (cmd)
+    {
+      case F_SETLKW:
+      case F_SETLKW64:
+	return SYSCALL_CANCEL (fcntl64, fd, cmd, arg);
+      case F_OFD_SETLKW:
+	{
+	  struct flock *flk = (struct flock *) arg;
+	  struct flock64 flk64 =
+	  {
+	    .l_type = flk->l_type,
+	    .l_whence = flk->l_whence,
+	    .l_start = flk->l_start,
+	    .l_len = flk->l_len,
+	    .l_pid = flk->l_pid
+	  };
+	  return SYSCALL_CANCEL (fcntl64, fd, cmd, &flk64);
+	}
+      case F_OFD_GETLK:
+      case F_OFD_SETLK:
+	{
+	  struct flock *flk = (struct flock *) arg;
+	  struct flock64 flk64 =
+	  {
+	    .l_type = flk->l_type,
+	    .l_whence = flk->l_whence,
+	    .l_start = flk->l_start,
+	    .l_len = flk->l_len,
+	    .l_pid = flk->l_pid
+	  };
+	  int ret = INLINE_SYSCALL_CALL (fcntl64, fd, cmd, &flk64);
+	  if (ret == -1)
+	    return -1;
+	  if ((off_t) flk64.l_start != flk64.l_start
+	      || (off_t) flk64.l_len != flk64.l_len)
+	    {
+	      __set_errno (EOVERFLOW);
+	      return -1;
+	    }
+	  flk->l_type = flk64.l_type;
+	  flk->l_whence = flk64.l_whence;
+	  flk->l_start = flk64.l_start;
+	  flk->l_len = flk64.l_len;
+	  flk->l_pid = flk64.l_pid;
+	  return ret;
+	}
+      /* Since only F_SETLKW{64}/F_OLD_SETLK are cancellation entrypoints and
+	 only OFD locks require LFS handling, all others flags are handled
+	 unmodified by calling __NR_fcntl64.  */
+      default:
+        return __fcntl64_nocancel_adjusted (fd, cmd, arg);
+    }
 }
 libc_hidden_def (__libc_fcntl)
 
 weak_alias (__libc_fcntl, __fcntl)
 libc_hidden_weak (__fcntl)
+
+# include <shlib-compat.h>
+# if SHLIB_COMPAT(libc, GLIBC_2_0, GLIBC_2_28)
+int
+__old_libc_fcntl64 (int fd, int cmd, ...)
+{
+  va_list ap;
+  void *arg;
+
+  va_start (ap, cmd);
+  arg = va_arg (ap, void *);
+  va_end (ap);
+
+  /* Previous versions called __NR_fcntl64 for fcntl (which did not handle
+     OFD locks in LFS mode).  */
+  return __libc_fcntl64 (fd, cmd, arg);
+}
+compat_symbol (libc, __old_libc_fcntl64, fcntl, GLIBC_2_0);
+versioned_symbol (libc, __libc_fcntl, fcntl, GLIBC_2_28);
+# else
 weak_alias (__libc_fcntl, fcntl)
+# endif
+
+#endif /* __OFF_T_MATCHES_OFF64_T  */
diff --git a/sysdeps/unix/sysv/linux/fcntl64.c b/sysdeps/unix/sysv/linux/fcntl64.c
new file mode 100644
index 0000000000..f21667ae43
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/fcntl64.c
@@ -0,0 +1,63 @@
+/* Manipulate file descriptor.  Linux LFS version.
+   Copyright (C) 2018 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#define fcntl __no_decl_fcntl
+#define __fcntl __no_decl___fcntl
+#include <fcntl.h>
+#undef fcntl
+#undef __fcntl
+#include <stdarg.h>
+#include <errno.h>
+#include <sysdep-cancel.h>
+
+#ifndef __NR_fcntl64
+# define __NR_fcntl64 __NR_fcntl
+#endif
+
+#ifndef FCNTL_ADJUST_CMD
+# define FCNTL_ADJUST_CMD(__cmd) __cmd
+#endif
+
+int
+__libc_fcntl64 (int fd, int cmd, ...)
+{
+  va_list ap;
+  void *arg;
+
+  va_start (ap, cmd);
+  arg = va_arg (ap, void *);
+  va_end (ap);
+
+  cmd = FCNTL_ADJUST_CMD (cmd);
+
+  if (cmd == F_SETLKW || cmd == F_SETLKW64 || cmd == F_OFD_SETLKW)
+    return SYSCALL_CANCEL (fcntl64, fd, cmd, arg);
+
+  return __fcntl64_nocancel_adjusted (fd, cmd, arg);
+}
+libc_hidden_def (__libc_fcntl64)
+weak_alias (__libc_fcntl64, __fcntl64)
+libc_hidden_weak (__fcntl64)
+weak_alias (__libc_fcntl64, fcntl64)
+
+#ifdef __OFF_T_MATCHES_OFF64_T
+weak_alias (__libc_fcntl64, __libc_fcntl)
+weak_alias (__libc_fcntl64, __fcntl)
+weak_alias (__libc_fcntl64, __GI___fcntl)
+weak_alias (__libc_fcntl64, fcntl)
+#endif
diff --git a/sysdeps/unix/sysv/linux/fcntl_nocancel.c b/sysdeps/unix/sysv/linux/fcntl_nocancel.c
index f50e382c4a..dd336b5679 100644
--- a/sysdeps/unix/sysv/linux/fcntl_nocancel.c
+++ b/sysdeps/unix/sysv/linux/fcntl_nocancel.c
@@ -31,7 +31,7 @@
 #endif
 
 int
-__fcntl_nocancel (int fd, int cmd, ...)
+__fcntl64_nocancel (int fd, int cmd, ...)
 {
   va_list ap;
   void *arg;
@@ -42,12 +42,12 @@ __fcntl_nocancel (int fd, int cmd, ...)
 
   cmd = FCNTL_ADJUST_CMD (cmd);
 
-  return __fcntl_nocancel_adjusted (fd, cmd, arg);
+  return __fcntl64_nocancel_adjusted (fd, cmd, arg);
 }
-hidden_def (__fcntl_nocancel)
+hidden_def (__fcntl64_nocancel)
 
 int
-__fcntl_nocancel_adjusted (int fd, int cmd, void *arg)
+__fcntl64_nocancel_adjusted (int fd, int cmd, void *arg)
 {
   if (cmd == F_GETOWN)
     {
diff --git a/sysdeps/unix/sysv/linux/hppa/libc.abilist b/sysdeps/unix/sysv/linux/hppa/libc.abilist
index d10695b7d3..06b00f730a 100644
--- a/sysdeps/unix/sysv/linux/hppa/libc.abilist
+++ b/sysdeps/unix/sysv/linux/hppa/libc.abilist
@@ -1872,6 +1872,8 @@ GLIBC_2.27 wcstof32x F
 GLIBC_2.27 wcstof32x_l F
 GLIBC_2.27 wcstof64 F
 GLIBC_2.27 wcstof64_l F
+GLIBC_2.28 fcntl F
+GLIBC_2.28 fcntl64 F
 GLIBC_2.3 __ctype_b_loc F
 GLIBC_2.3 __ctype_tolower_loc F
 GLIBC_2.3 __ctype_toupper_loc F
diff --git a/sysdeps/unix/sysv/linux/i386/libc.abilist b/sysdeps/unix/sysv/linux/i386/libc.abilist
index 23092ab6d7..1c1cc00d40 100644
--- a/sysdeps/unix/sysv/linux/i386/libc.abilist
+++ b/sysdeps/unix/sysv/linux/i386/libc.abilist
@@ -2037,6 +2037,8 @@ GLIBC_2.27 wcstof64 F
 GLIBC_2.27 wcstof64_l F
 GLIBC_2.27 wcstof64x F
 GLIBC_2.27 wcstof64x_l F
+GLIBC_2.28 fcntl F
+GLIBC_2.28 fcntl64 F
 GLIBC_2.3 __ctype_b_loc F
 GLIBC_2.3 __ctype_tolower_loc F
 GLIBC_2.3 __ctype_toupper_loc F
diff --git a/sysdeps/unix/sysv/linux/ia64/libc.abilist b/sysdeps/unix/sysv/linux/ia64/libc.abilist
index 7bf259e86c..f6e17a005f 100644
--- a/sysdeps/unix/sysv/linux/ia64/libc.abilist
+++ b/sysdeps/unix/sysv/linux/ia64/libc.abilist
@@ -1907,6 +1907,7 @@ GLIBC_2.27 wcstof64 F
 GLIBC_2.27 wcstof64_l F
 GLIBC_2.27 wcstof64x F
 GLIBC_2.27 wcstof64x_l F
+GLIBC_2.28 fcntl64 F
 GLIBC_2.3 __ctype_b_loc F
 GLIBC_2.3 __ctype_tolower_loc F
 GLIBC_2.3 __ctype_toupper_loc F
diff --git a/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist b/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist
index 4673bcd79b..ee054a618d 100644
--- a/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist
+++ b/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist
@@ -116,6 +116,8 @@ GLIBC_2.27 wcstof32x F
 GLIBC_2.27 wcstof32x_l F
 GLIBC_2.27 wcstof64 F
 GLIBC_2.27 wcstof64_l F
+GLIBC_2.28 fcntl F
+GLIBC_2.28 fcntl64 F
 GLIBC_2.4 _Exit F
 GLIBC_2.4 _IO_2_1_stderr_ D 0x98
 GLIBC_2.4 _IO_2_1_stdin_ D 0x98
diff --git a/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist b/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist
index 1f8ac40399..227a0581cb 100644
--- a/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist
+++ b/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist
@@ -1981,6 +1981,8 @@ GLIBC_2.27 wcstof32x F
 GLIBC_2.27 wcstof32x_l F
 GLIBC_2.27 wcstof64 F
 GLIBC_2.27 wcstof64_l F
+GLIBC_2.28 fcntl F
+GLIBC_2.28 fcntl64 F
 GLIBC_2.3 __ctype_b_loc F
 GLIBC_2.3 __ctype_tolower_loc F
 GLIBC_2.3 __ctype_toupper_loc F
diff --git a/sysdeps/unix/sysv/linux/microblaze/libc.abilist b/sysdeps/unix/sysv/linux/microblaze/libc.abilist
index 09277f5954..18781b3017 100644
--- a/sysdeps/unix/sysv/linux/microblaze/libc.abilist
+++ b/sysdeps/unix/sysv/linux/microblaze/libc.abilist
@@ -2122,3 +2122,5 @@ GLIBC_2.27 wcstof32x F
 GLIBC_2.27 wcstof32x_l F
 GLIBC_2.27 wcstof64 F
 GLIBC_2.27 wcstof64_l F
+GLIBC_2.28 fcntl F
+GLIBC_2.28 fcntl64 F
diff --git a/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist
index f562e20f23..2d86989cf2 100644
--- a/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist
+++ b/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist
@@ -1959,6 +1959,8 @@ GLIBC_2.27 wcstof32x F
 GLIBC_2.27 wcstof32x_l F
 GLIBC_2.27 wcstof64 F
 GLIBC_2.27 wcstof64_l F
+GLIBC_2.28 fcntl F
+GLIBC_2.28 fcntl64 F
 GLIBC_2.3 __ctype_b_loc F
 GLIBC_2.3 __ctype_tolower_loc F
 GLIBC_2.3 __ctype_toupper_loc F
diff --git a/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist
index ceb7388829..b8b113e1a5 100644
--- a/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist
+++ b/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist
@@ -1957,6 +1957,8 @@ GLIBC_2.27 wcstof32x F
 GLIBC_2.27 wcstof32x_l F
 GLIBC_2.27 wcstof64 F
 GLIBC_2.27 wcstof64_l F
+GLIBC_2.28 fcntl F
+GLIBC_2.28 fcntl64 F
 GLIBC_2.3 __ctype_b_loc F
 GLIBC_2.3 __ctype_tolower_loc F
 GLIBC_2.3 __ctype_toupper_loc F
diff --git a/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist
index 5765f487a2..6a3cd13e2d 100644
--- a/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist
+++ b/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist
@@ -1965,6 +1965,8 @@ GLIBC_2.27 wcstof64 F
 GLIBC_2.27 wcstof64_l F
 GLIBC_2.27 wcstof64x F
 GLIBC_2.27 wcstof64x_l F
+GLIBC_2.28 fcntl F
+GLIBC_2.28 fcntl64 F
 GLIBC_2.3 __ctype_b_loc F
 GLIBC_2.3 __ctype_tolower_loc F
 GLIBC_2.3 __ctype_toupper_loc F
diff --git a/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist
index a84bb45a38..596ec05379 100644
--- a/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist
+++ b/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist
@@ -1961,6 +1961,7 @@ GLIBC_2.27 wcstof64 F
 GLIBC_2.27 wcstof64_l F
 GLIBC_2.27 wcstof64x F
 GLIBC_2.27 wcstof64x_l F
+GLIBC_2.28 fcntl64 F
 GLIBC_2.3 __ctype_b_loc F
 GLIBC_2.3 __ctype_tolower_loc F
 GLIBC_2.3 __ctype_toupper_loc F
diff --git a/sysdeps/unix/sysv/linux/nios2/libc.abilist b/sysdeps/unix/sysv/linux/nios2/libc.abilist
index e43295986c..8da18eed57 100644
--- a/sysdeps/unix/sysv/linux/nios2/libc.abilist
+++ b/sysdeps/unix/sysv/linux/nios2/libc.abilist
@@ -2163,3 +2163,5 @@ GLIBC_2.27 wcstof32x F
 GLIBC_2.27 wcstof32x_l F
 GLIBC_2.27 wcstof64 F
 GLIBC_2.27 wcstof64_l F
+GLIBC_2.28 fcntl F
+GLIBC_2.28 fcntl64 F
diff --git a/sysdeps/unix/sysv/linux/not-cancel.h b/sysdeps/unix/sysv/linux/not-cancel.h
index 0b5c955989..09de92dee9 100644
--- a/sysdeps/unix/sysv/linux/not-cancel.h
+++ b/sysdeps/unix/sysv/linux/not-cancel.h
@@ -76,7 +76,7 @@ __typeof (pause) __pause_nocancel;
 __typeof (__nanosleep) __nanosleep_nocancel;
 
 /* Uncancelable fcntl.  */
-__typeof (__fcntl) __fcntl_nocancel;
+__typeof (__fcntl) __fcntl64_nocancel;
 
 #if IS_IN (libc) || IS_IN (rtld)
 hidden_proto (__open_nocancel)
@@ -89,7 +89,7 @@ hidden_proto (__close_nocancel)
 hidden_proto (__waitpid_nocancel)
 hidden_proto (__pause_nocancel)
 hidden_proto (__nanosleep_nocancel)
-hidden_proto (__fcntl_nocancel)
+hidden_proto (__fcntl64_nocancel)
 #endif
 
 #endif /* NOT_CANCEL_H  */
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist
index a5f2b23068..555751eb12 100644
--- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist
@@ -1985,6 +1985,8 @@ GLIBC_2.27 wcstof32x F
 GLIBC_2.27 wcstof32x_l F
 GLIBC_2.27 wcstof64 F
 GLIBC_2.27 wcstof64_l F
+GLIBC_2.28 fcntl F
+GLIBC_2.28 fcntl64 F
 GLIBC_2.3 __ctype_b_loc F
 GLIBC_2.3 __ctype_tolower_loc F
 GLIBC_2.3 __ctype_toupper_loc F
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist
index e4cbe36279..80324e41aa 100644
--- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist
@@ -1989,6 +1989,8 @@ GLIBC_2.27 wcstof32x F
 GLIBC_2.27 wcstof32x_l F
 GLIBC_2.27 wcstof64 F
 GLIBC_2.27 wcstof64_l F
+GLIBC_2.28 fcntl F
+GLIBC_2.28 fcntl64 F
 GLIBC_2.3 __ctype_b_loc F
 GLIBC_2.3 __ctype_tolower_loc F
 GLIBC_2.3 __ctype_toupper_loc F
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/libc-le.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc64/libc-le.abilist
index 9869feb56b..97b1d354af 100644
--- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/libc-le.abilist
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/libc-le.abilist
@@ -2221,3 +2221,4 @@ GLIBC_2.27 wcstof64 F
 GLIBC_2.27 wcstof64_l F
 GLIBC_2.27 wcstof64x F
 GLIBC_2.27 wcstof64x_l F
+GLIBC_2.28 fcntl64 F
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc64/libc.abilist
index e526dc4627..15be314921 100644
--- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/libc.abilist
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/libc.abilist
@@ -116,6 +116,7 @@ GLIBC_2.27 wcstof32x F
 GLIBC_2.27 wcstof32x_l F
 GLIBC_2.27 wcstof64 F
 GLIBC_2.27 wcstof64_l F
+GLIBC_2.28 fcntl64 F
 GLIBC_2.3 _Exit F
 GLIBC_2.3 _IO_2_1_stderr_ D 0xe0
 GLIBC_2.3 _IO_2_1_stdin_ D 0xe0
diff --git a/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist b/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist
index e6319eef8d..436b992251 100644
--- a/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist
+++ b/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist
@@ -2093,3 +2093,4 @@ GLIBC_2.27 xdrstdio_create F
 GLIBC_2.27 xencrypt F
 GLIBC_2.27 xprt_register F
 GLIBC_2.27 xprt_unregister F
+GLIBC_2.28 fcntl64 F
diff --git a/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist b/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist
index 41cdda0c2e..f66715f0c9 100644
--- a/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist
+++ b/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist
@@ -1994,6 +1994,8 @@ GLIBC_2.27 wcstof64 F
 GLIBC_2.27 wcstof64_l F
 GLIBC_2.27 wcstof64x F
 GLIBC_2.27 wcstof64x_l F
+GLIBC_2.28 fcntl F
+GLIBC_2.28 fcntl64 F
 GLIBC_2.3 __ctype_b_loc F
 GLIBC_2.3 __ctype_tolower_loc F
 GLIBC_2.3 __ctype_toupper_loc F
diff --git a/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist b/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist
index 8a756cf287..bd6242861b 100644
--- a/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist
+++ b/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist
@@ -1900,6 +1900,7 @@ GLIBC_2.27 wcstof64 F
 GLIBC_2.27 wcstof64_l F
 GLIBC_2.27 wcstof64x F
 GLIBC_2.27 wcstof64x_l F
+GLIBC_2.28 fcntl64 F
 GLIBC_2.3 __ctype_b_loc F
 GLIBC_2.3 __ctype_tolower_loc F
 GLIBC_2.3 __ctype_toupper_loc F
diff --git a/sysdeps/unix/sysv/linux/sh/libc.abilist b/sysdeps/unix/sysv/linux/sh/libc.abilist
index 999bddd1db..f2f070fbce 100644
--- a/sysdeps/unix/sysv/linux/sh/libc.abilist
+++ b/sysdeps/unix/sysv/linux/sh/libc.abilist
@@ -1876,6 +1876,8 @@ GLIBC_2.27 wcstof32x F
 GLIBC_2.27 wcstof32x_l F
 GLIBC_2.27 wcstof64 F
 GLIBC_2.27 wcstof64_l F
+GLIBC_2.28 fcntl F
+GLIBC_2.28 fcntl64 F
 GLIBC_2.3 __ctype_b_loc F
 GLIBC_2.3 __ctype_tolower_loc F
 GLIBC_2.3 __ctype_toupper_loc F
diff --git a/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist b/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist
index 7c4296fc10..265087f6a8 100644
--- a/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist
+++ b/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist
@@ -1988,6 +1988,8 @@ GLIBC_2.27 wcstof64 F
 GLIBC_2.27 wcstof64_l F
 GLIBC_2.27 wcstof64x F
 GLIBC_2.27 wcstof64x_l F
+GLIBC_2.28 fcntl F
+GLIBC_2.28 fcntl64 F
 GLIBC_2.3 __ctype_b_loc F
 GLIBC_2.3 __ctype_tolower_loc F
 GLIBC_2.3 __ctype_toupper_loc F
diff --git a/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist b/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist
index dafe9d74b7..16a69812cb 100644
--- a/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist
+++ b/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist
@@ -1930,6 +1930,7 @@ GLIBC_2.27 wcstof64 F
 GLIBC_2.27 wcstof64_l F
 GLIBC_2.27 wcstof64x F
 GLIBC_2.27 wcstof64x_l F
+GLIBC_2.28 fcntl64 F
 GLIBC_2.3 __ctype_b_loc F
 GLIBC_2.3 __ctype_tolower_loc F
 GLIBC_2.3 __ctype_toupper_loc F
diff --git a/sysdeps/unix/sysv/linux/tst-ofdlocks-compat.c b/sysdeps/unix/sysv/linux/tst-ofdlocks-compat.c
new file mode 100644
index 0000000000..d1d00eb3fb
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/tst-ofdlocks-compat.c
@@ -0,0 +1,84 @@
+/* Check non representable OFD locks regions in non-LFS mode for compat
+   mode (BZ #20251)
+   Copyright (C) 2018 Free Software Foundation, Inc.
+
+   This program is free software; you can redistribute it and/or
+   modify it under the terms of the GNU General Public License
+   as published by the Free Software Foundation; either version 2
+   of the License, or (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <unistd.h>
+#include <fcntl.h>
+#include <stdint.h>
+#include <errno.h>
+
+#include <support/temp_file.h>
+#include <support/check.h>
+
+#include <shlib-compat.h>
+#if TEST_COMPAT (libc, GLIBC_2_0, GLIBC_2_28)
+compat_symbol_reference (libc, fcntl, fcntl, GLIBC_2_0);
+
+static char *temp_filename;
+static int temp_fd;
+
+static void
+do_prepare (int argc, char **argv)
+{
+  temp_fd = create_temp_file ("tst-ofdlocks-compat.", &temp_filename);
+  TEST_VERIFY_EXIT (temp_fd != -1);
+}
+
+#define PREPARE do_prepare
+
+static int
+do_test (void)
+{
+  /* The compat fcntl version for architectures which support non-LFS
+     operations does not wrap the flock OFD argument, so the struct is passed
+     unmodified to kernel.  It means no EOVERFLOW is returned, so operations
+     with LFS should not incur in failure.  */
+
+  struct flock64 lck64 = {
+    .l_type   = F_WRLCK,
+    .l_whence = SEEK_SET,
+    .l_start  = (off64_t)INT32_MAX + 1024,
+    .l_len    = 1024,
+  };
+  TEST_VERIFY_EXIT (fcntl (temp_fd, F_OFD_SETLKW, &lck64) == 0);
+
+  /* Open file description locks placed through the same open file description
+     (either by same file descriptor or a duplicated one created by fork,
+     dup, fcntl F_DUPFD, etc.) overwrites then old lock.  To force a
+     conflicting lock combination, it creates a new file descriptor.  */
+  int fd = open64 (temp_filename, O_RDWR, 0666);
+  TEST_VERIFY_EXIT (fd != -1);
+
+  struct flock64 lck = {
+    .l_type   = F_WRLCK,
+    .l_whence = SEEK_SET,
+    .l_start  = INT32_MAX - 1024,
+    .l_len    = 4 * 1024,
+  };
+  TEST_VERIFY (fcntl (fd, F_OFD_GETLK, &lck) == 0);
+
+  return 0;
+}
+#else
+static int
+do_test (void)
+{
+  return 77;
+}
+#endif
+
+#include <support/test-driver.c>
diff --git a/sysdeps/unix/sysv/linux/tst-ofdlocks.c b/sysdeps/unix/sysv/linux/tst-ofdlocks.c
new file mode 100644
index 0000000000..bd345e9b64
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/tst-ofdlocks.c
@@ -0,0 +1,76 @@
+/* Check non representable OFD locks regions in non-LFS mode (BZ #20251)
+   Copyright (C) 2018 Free Software Foundation, Inc.
+
+   This program is free software; you can redistribute it and/or
+   modify it under the terms of the GNU General Public License
+   as published by the Free Software Foundation; either version 2
+   of the License, or (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <unistd.h>
+#include <fcntl.h>
+#include <stdint.h>
+#include <errno.h>
+
+#include <support/temp_file.h>
+#include <support/check.h>
+
+static char *temp_filename;
+static int temp_fd;
+
+static void
+do_prepare (int argc, char **argv)
+{
+  temp_fd = create_temp_file ("tst-ofdlocks.", &temp_filename);
+  TEST_VERIFY_EXIT (temp_fd != -1);
+}
+
+#define PREPARE do_prepare
+
+static int
+do_test (void)
+{
+  /* It first allocates a open file description lock range which can not
+     be represented in a 32 bit struct flock.   */
+  struct flock64 lck64 = {
+    .l_type   = F_WRLCK,
+    .l_whence = SEEK_SET,
+    .l_start  = (off64_t)INT32_MAX + 1024,
+    .l_len    = 1024,
+  };
+  TEST_VERIFY_EXIT (fcntl64 (temp_fd, F_OFD_SETLKW, &lck64) == 0);
+
+  /* Open file description locks placed through the same open file description
+     (either by same file descriptor or a duplicated one created by fork,
+     dup, fcntl F_DUPFD, etc.) overwrites then old lock.  To force a
+     conflicting lock combination, it creates a new file descriptor.  */
+  int fd = open64 (temp_filename, O_RDWR, 0666);
+  TEST_VERIFY_EXIT (fd != -1);
+
+  /* It tries then to allocate another open file descriptior with a valid
+     non-LFS bits struct flock but which will result in a conflicted region
+     which can not be represented in a non-LFS struct flock.  */
+  struct flock lck = {
+    .l_type   = F_WRLCK,
+    .l_whence = SEEK_SET,
+    .l_start  = INT32_MAX - 1024,
+    .l_len    = 4 * 1024,
+  };
+  int r = fcntl (fd, F_OFD_GETLK, &lck);
+  if (sizeof (off_t) != sizeof (off64_t))
+    TEST_VERIFY (r == -1 && errno == EOVERFLOW);
+  else
+    TEST_VERIFY (r == 0);
+
+  return 0;
+}
+
+#include <support/test-driver.c>
diff --git a/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist b/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist
index f72d494920..fa8c198d13 100644
--- a/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist
+++ b/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist
@@ -1888,6 +1888,7 @@ GLIBC_2.27 wcstof64 F
 GLIBC_2.27 wcstof64_l F
 GLIBC_2.27 wcstof64x F
 GLIBC_2.27 wcstof64x_l F
+GLIBC_2.28 fcntl64 F
 GLIBC_2.3 __ctype_b_loc F
 GLIBC_2.3 __ctype_tolower_loc F
 GLIBC_2.3 __ctype_toupper_loc F
diff --git a/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist b/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist
index 96c9fa050e..2536971682 100644
--- a/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist
+++ b/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist
@@ -2139,3 +2139,4 @@ GLIBC_2.27 wcstof64 F
 GLIBC_2.27 wcstof64_l F
 GLIBC_2.27 wcstof64x F
 GLIBC_2.27 wcstof64x_l F
+GLIBC_2.28 fcntl64 F