[PATCH 0/3] asm-generic: Add renameat2, drop renameat by default

[PATCH 0/3] asm-generic: Add renameat2, drop renameat by default

[James Hogan]

A few patches relating to the renameat2 syscall added for v3.15 and the
asm-generic syscall list.

The first adds it to the generic syscall list. I'll send this upstream
for v3.15 (but acks still welcome).

The second and third patches make the renameat syscall optional, since
renameat2 provides a superset of its functionality, and removes renameat
from the generic syscall list by default. All existing users now define
__ARCH_WANT_RENAMEAT so that nothing breaks, but new architectures are
expected not to define it. Unless anybody requests otherwise I'll await
an Ack from Arnd for these two and queue them for v3.16.

James Hogan (3):
  asm-generic: Add renameat2 syscall
  scripts/checksyscalls.sh: Make renameat optional
  asm-generic: Drop renameat syscall from default list

 arch/arc/include/uapi/asm/unistd.h       | 1 +
 arch/arm64/include/uapi/asm/unistd.h     | 3 +++
 arch/c6x/include/uapi/asm/unistd.h       | 1 +
 arch/hexagon/include/uapi/asm/unistd.h   | 1 +
 arch/metag/include/uapi/asm/unistd.h     | 2 ++
 arch/openrisc/include/uapi/asm/unistd.h  | 1 +
 arch/score/include/uapi/asm/unistd.h     | 1 +
 arch/tile/include/uapi/asm/unistd.h      | 1 +
 arch/unicore32/include/uapi/asm/unistd.h | 2 ++
 include/uapi/asm-generic/unistd.h        | 7 ++++++-
 scripts/checksyscalls.sh                 | 5 ++++-
 11 files changed, 23 insertions(+), 2 deletions(-)

Cc: Arnd Bergmann <arnd@arndb.de>
Cc: linux-arch@vger.kernel.org
Cc: Vineet Gupta <vgupta@synopsys.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: Mark Salter <msalter@redhat.com>
Cc: Aurelien Jacquiot <a-jacquiot@ti.com>
Cc: linux-c6x-dev@linux-c6x.org
Cc: Richard Kuo <rkuo@codeaurora.org>
Cc: linux-hexagon@vger.kernel.org
Cc: linux-metag@vger.kernel.org
Cc: Jonas Bonn <jonas@southpole.se>
Cc: linux@lists.openrisc.net
Cc: Chen Liqin <liqin.linux@gmail.com>
Cc: Lennox Wu <lennox.wu@gmail.com>
Cc: Chris Metcalf <cmetcalf@tilera.com>
Cc: Guan Xuetao <gxt@mprc.pku.edu.cn>

-- 
1.8.1.2

[PATCH 1/3] asm-generic: Add renameat2 syscall

[James Hogan]

Add the renameat2 syscall to the generic syscall list, which is used by
the following architectures: arc, arm64, c6x, hexagon, metag, openrisc,
score, tile, unicore32.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: linux-arch@vger.kernel.org
Cc: Vineet Gupta <vgupta@synopsys.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: Mark Salter <msalter@redhat.com>
Cc: Aurelien Jacquiot <a-jacquiot@ti.com>
Cc: linux-c6x-dev@linux-c6x.org
Cc: Richard Kuo <rkuo@codeaurora.org>
Cc: linux-hexagon@vger.kernel.org
Cc: linux-metag@vger.kernel.org
Cc: Jonas Bonn <jonas@southpole.se>
Cc: linux@lists.openrisc.net
Cc: Chen Liqin <liqin.linux@gmail.com>
Cc: Lennox Wu <lennox.wu@gmail.com>
Cc: Chris Metcalf <cmetcalf@tilera.com>
Cc: Guan Xuetao <gxt@mprc.pku.edu.cn>
---
This patch is for v3.15.
---
 include/uapi/asm-generic/unistd.h | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/include/uapi/asm-generic/unistd.h b/include/uapi/asm-generic/unistd.h
index 6db66783d268..333640608087 100644
--- a/include/uapi/asm-generic/unistd.h
+++ b/include/uapi/asm-generic/unistd.h
@@ -697,9 +697,11 @@ __SYSCALL(__NR_finit_module, sys_finit_module)
 __SYSCALL(__NR_sched_setattr, sys_sched_setattr)
 #define __NR_sched_getattr 275
 __SYSCALL(__NR_sched_getattr, sys_sched_getattr)
+#define __NR_renameat2 276
+__SYSCALL(__NR_renameat2, sys_renameat2)
 
 #undef __NR_syscalls
-#define __NR_syscalls 276
+#define __NR_syscalls 277
 
 /*
  * All syscalls below here should go away really,
-- 
1.8.1.2

Re: [PATCH 1/3] asm-generic: Add renameat2 syscall

[Arnd Bergmann]

On Wednesday 23 April 2014, James Hogan wrote:
> Add the renameat2 syscall to the generic syscall list, which is used by
> the following architectures: arc, arm64, c6x, hexagon, metag, openrisc,
> score, tile, unicore32.
> 
> Signed-off-by: James Hogan <james.hogan@imgtec.com>
> Cc: Arnd Bergmann <arnd@arndb.de>
> Cc: linux-arch@vger.kernel.org
> Cc: Vineet Gupta <vgupta@synopsys.com>
> Cc: Catalin Marinas <catalin.marinas@arm.com>
> Cc: Will Deacon <will.deacon@arm.com>
> Cc: linux-arm-kernel@lists.infradead.org
> Cc: Mark Salter <msalter@redhat.com>
> Cc: Aurelien Jacquiot <a-jacquiot@ti.com>
> Cc: linux-c6x-dev@linux-c6x.org
> Cc: Richard Kuo <rkuo@codeaurora.org>
> Cc: linux-hexagon@vger.kernel.org
> Cc: linux-metag@vger.kernel.org
> Cc: Jonas Bonn <jonas@southpole.se>
> Cc: linux@lists.openrisc.net
> Cc: Chen Liqin <liqin.linux@gmail.com>
> Cc: Lennox Wu <lennox.wu@gmail.com>
> Cc: Chris Metcalf <cmetcalf@tilera.com>
> Cc: Guan Xuetao <gxt@mprc.pku.edu.cn>

Acked-by: Arnd Bergmann <arnd@arndb.de>

[RFC 2/3] scripts/checksyscalls.sh: Make renameat optional

[James Hogan]

The new renameat2 syscall provides all the functionality of renameat
with an additional flags argument, so make renameat optional so that
future architectures can omit it without getting a warning.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: linux-arch@vger.kernel.org
---
This patch doesn't affect existing architectures, so there's no harm for
this to wait for the v3.16 merge window.
---
 scripts/checksyscalls.sh | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/scripts/checksyscalls.sh b/scripts/checksyscalls.sh
index fd8fa9aa7c4e..5b3add31f9f1 100755
--- a/scripts/checksyscalls.sh
+++ b/scripts/checksyscalls.sh
@@ -25,7 +25,7 @@ cat << EOF
 #define __IGNORE_rmdir		/* unlinkat */
 #define __IGNORE_lchown		/* fchownat */
 #define __IGNORE_access		/* faccessat */
-#define __IGNORE_rename		/* renameat */
+#define __IGNORE_rename		/* renameat2 */
 #define __IGNORE_readlink	/* readlinkat */
 #define __IGNORE_symlink	/* symlinkat */
 #define __IGNORE_utimes		/* futimesat */
@@ -37,6 +37,9 @@ cat << EOF
 #define __IGNORE_lstat64	/* fstatat64 */
 #endif
 
+/* Missing flags argument */
+#define __IGNORE_renameat	/* renameat2 */
+
 /* CLOEXEC flag */
 #define __IGNORE_pipe		/* pipe2 */
 #define __IGNORE_dup2		/* dup3 */
-- 
1.8.1.2

Re: [RFC 2/3] scripts/checksyscalls.sh: Make renameat optional

[Arnd Bergmann]

On Wednesday 23 April 2014, James Hogan wrote:
> The new renameat2 syscall provides all the functionality of renameat
> with an additional flags argument, so make renameat optional so that
> future architectures can omit it without getting a warning.
> 
> Signed-off-by: James Hogan <james.hogan@imgtec.com>
> Cc: Arnd Bergmann <arnd@arndb.de>
> Cc: linux-arch@vger.kernel.org
> ---
> This patch doesn't affect existing architectures, so there's no harm for
> this to wait for the v3.16 merge window.

Acked-by: Arnd Bergmann <arnd@arndb.de>

I'm not actually sure how we'd arrange for new architectures not
to provide renameat() when using the generic syscall ABI, but this
patch is correct anyway.

	Arnd

[RFC 3/3] asm-generic: Drop renameat syscall from default list

[James Hogan]

The new renameat2 syscall provides all the functionality provided by the
renameat syscall and adds flags, so future architectures won't need to
include renameat.

Therefore drop the renameat syscall from the generic syscall list unless
__ARCH_WANT_RENAMEAT is defined by the architecture's unistd.h prior to
including asm-generic/unistd.h, and adjust all architectures using the
generic syscall list to define it so that no in-tree architectures are
affected.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: linux-arch@vger.kernel.org
Cc: Vineet Gupta <vgupta@synopsys.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: Mark Salter <msalter@redhat.com>
Cc: Aurelien Jacquiot <a-jacquiot@ti.com>
Cc: linux-c6x-dev@linux-c6x.org
Cc: Richard Kuo <rkuo@codeaurora.org>
Cc: linux-hexagon@vger.kernel.org
Cc: linux-metag@vger.kernel.org
Cc: Jonas Bonn <jonas@southpole.se>
Cc: linux@lists.openrisc.net
Cc: Chen Liqin <liqin.linux@gmail.com>
Cc: Lennox Wu <lennox.wu@gmail.com>
Cc: Chris Metcalf <cmetcalf@tilera.com>
Cc: Guan Xuetao <gxt@mprc.pku.edu.cn>
---
Is this the approach we want to take to keep the default syscall list
minimal? We could for example have made renameat2 use the renameat
syscall number for new arches, but it seemed best to leave a gap for new
arches to improve consistency of numbering.

This patch is a no-op for arches in tree, so there's no harm for this to
wait for the v3.16 merge window.
---
 arch/arc/include/uapi/asm/unistd.h       | 1 +
 arch/arm64/include/uapi/asm/unistd.h     | 3 +++
 arch/c6x/include/uapi/asm/unistd.h       | 1 +
 arch/hexagon/include/uapi/asm/unistd.h   | 1 +
 arch/metag/include/uapi/asm/unistd.h     | 2 ++
 arch/openrisc/include/uapi/asm/unistd.h  | 1 +
 arch/score/include/uapi/asm/unistd.h     | 1 +
 arch/tile/include/uapi/asm/unistd.h      | 1 +
 arch/unicore32/include/uapi/asm/unistd.h | 2 ++
 include/uapi/asm-generic/unistd.h        | 3 +++
 10 files changed, 16 insertions(+)

diff --git a/arch/arc/include/uapi/asm/unistd.h b/arch/arc/include/uapi/asm/unistd.h
index 39e58d1cdf90..41fa2ec9e02c 100644
--- a/arch/arc/include/uapi/asm/unistd.h
+++ b/arch/arc/include/uapi/asm/unistd.h
@@ -15,6 +15,7 @@
 #if !defined(_UAPI_ASM_ARC_UNISTD_H) || defined(__SYSCALL)
 #define _UAPI_ASM_ARC_UNISTD_H
 
+#define __ARCH_WANT_RENAMEAT
 #define __ARCH_WANT_SYS_EXECVE
 #define __ARCH_WANT_SYS_CLONE
 #define __ARCH_WANT_SYS_VFORK
diff --git a/arch/arm64/include/uapi/asm/unistd.h b/arch/arm64/include/uapi/asm/unistd.h
index 1caadc24e3fe..043d17a21342 100644
--- a/arch/arm64/include/uapi/asm/unistd.h
+++ b/arch/arm64/include/uapi/asm/unistd.h
@@ -13,4 +13,7 @@
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
+
+#define __ARCH_WANT_RENAMEAT
+
 #include <asm-generic/unistd.h>
diff --git a/arch/c6x/include/uapi/asm/unistd.h b/arch/c6x/include/uapi/asm/unistd.h
index e7d09a614d10..12d73d9d81f5 100644
--- a/arch/c6x/include/uapi/asm/unistd.h
+++ b/arch/c6x/include/uapi/asm/unistd.h
@@ -14,6 +14,7 @@
  *   more details.
  */
 
+#define __ARCH_WANT_RENAMEAT
 #define __ARCH_WANT_SYS_CLONE
 
 /* Use the standard ABI for syscalls. */
diff --git a/arch/hexagon/include/uapi/asm/unistd.h b/arch/hexagon/include/uapi/asm/unistd.h
index ffee405d6803..21517600432b 100644
--- a/arch/hexagon/include/uapi/asm/unistd.h
+++ b/arch/hexagon/include/uapi/asm/unistd.h
@@ -27,6 +27,7 @@
  */
 
 #define sys_mmap2 sys_mmap_pgoff
+#define __ARCH_WANT_RENAMEAT
 #define __ARCH_WANT_SYS_EXECVE
 #define __ARCH_WANT_SYS_CLONE
 #define __ARCH_WANT_SYS_VFORK
diff --git a/arch/metag/include/uapi/asm/unistd.h b/arch/metag/include/uapi/asm/unistd.h
index b80b8e899d22..459b6ec15848 100644
--- a/arch/metag/include/uapi/asm/unistd.h
+++ b/arch/metag/include/uapi/asm/unistd.h
@@ -7,6 +7,8 @@
  * (at your option) any later version.
  */
 
+#define __ARCH_WANT_RENAMEAT
+
 /* Use the standard ABI for syscalls. */
 #include <asm-generic/unistd.h>
 
diff --git a/arch/openrisc/include/uapi/asm/unistd.h b/arch/openrisc/include/uapi/asm/unistd.h
index ce40b71df006..471905bd7745 100644
--- a/arch/openrisc/include/uapi/asm/unistd.h
+++ b/arch/openrisc/include/uapi/asm/unistd.h
@@ -20,6 +20,7 @@
 
 #define sys_mmap2 sys_mmap_pgoff
 
+#define __ARCH_WANT_RENAMEAT
 #define __ARCH_WANT_SYS_FORK
 #define __ARCH_WANT_SYS_CLONE
 
diff --git a/arch/score/include/uapi/asm/unistd.h b/arch/score/include/uapi/asm/unistd.h
index 9cb4260a5f3e..d4008c339e89 100644
--- a/arch/score/include/uapi/asm/unistd.h
+++ b/arch/score/include/uapi/asm/unistd.h
@@ -1,5 +1,6 @@
 #define __ARCH_HAVE_MMU
 
+#define __ARCH_WANT_RENAMEAT
 #define __ARCH_WANT_SYSCALL_NO_AT
 #define __ARCH_WANT_SYSCALL_NO_FLAGS
 #define __ARCH_WANT_SYSCALL_OFF_T
diff --git a/arch/tile/include/uapi/asm/unistd.h b/arch/tile/include/uapi/asm/unistd.h
index 3866397aaf5a..24e9187e85a8 100644
--- a/arch/tile/include/uapi/asm/unistd.h
+++ b/arch/tile/include/uapi/asm/unistd.h
@@ -12,6 +12,7 @@
  *   more details.
  */
 
+#define __ARCH_WANT_RENAMEAT
 #if !defined(__LP64__) || defined(__SYSCALL_COMPAT)
 /* Use the flavor of this syscall that matches the 32-bit API better. */
 #define __ARCH_WANT_SYNC_FILE_RANGE2
diff --git a/arch/unicore32/include/uapi/asm/unistd.h b/arch/unicore32/include/uapi/asm/unistd.h
index d4cc4559d848..1f63c476528e 100644
--- a/arch/unicore32/include/uapi/asm/unistd.h
+++ b/arch/unicore32/include/uapi/asm/unistd.h
@@ -10,6 +10,8 @@
  * published by the Free Software Foundation.
  */
 
+#define __ARCH_WANT_RENAMEAT
+
 /* Use the standard ABI for syscalls. */
 #include <asm-generic/unistd.h>
 #define __ARCH_WANT_SYS_CLONE
diff --git a/include/uapi/asm-generic/unistd.h b/include/uapi/asm-generic/unistd.h
index 333640608087..947a864fa7d3 100644
--- a/include/uapi/asm-generic/unistd.h
+++ b/include/uapi/asm-generic/unistd.h
@@ -127,8 +127,11 @@ __SYSCALL(__NR_unlinkat, sys_unlinkat)
 __SYSCALL(__NR_symlinkat, sys_symlinkat)
 #define __NR_linkat 37
 __SYSCALL(__NR_linkat, sys_linkat)
+#ifdef __ARCH_WANT_RENAMEAT
+/* renameat is superseded with flags by renameat2 */
 #define __NR_renameat 38
 __SYSCALL(__NR_renameat, sys_renameat)
+#endif /* __ARCH_WANT_RENAMEAT */
 
 /* fs/namespace.c */
 #define __NR_umount2 39
-- 
1.8.1.2

Re: [RFC 3/3] asm-generic: Drop renameat syscall from default list

[Arnd Bergmann]

On Wednesday 23 April 2014, James Hogan wrote:
> The new renameat2 syscall provides all the functionality provided by the
> renameat syscall and adds flags, so future architectures won't need to
> include renameat.
> 
> Therefore drop the renameat syscall from the generic syscall list unless
> __ARCH_WANT_RENAMEAT is defined by the architecture's unistd.h prior to
> including asm-generic/unistd.h, and adjust all architectures using the
> generic syscall list to define it so that no in-tree architectures are
> affected.

I should have read this one before replying to patch 2 ;-)

> Signed-off-by: James Hogan <james.hogan@imgtec.com>
> Cc: Arnd Bergmann <arnd@arndb.de>
> Cc: linux-arch@vger.kernel.org
> Cc: Vineet Gupta <vgupta@synopsys.com>
> Cc: Catalin Marinas <catalin.marinas@arm.com>
> Cc: Will Deacon <will.deacon@arm.com>
> Cc: linux-arm-kernel@lists.infradead.org
> Cc: Mark Salter <msalter@redhat.com>
> Cc: Aurelien Jacquiot <a-jacquiot@ti.com>
> Cc: linux-c6x-dev@linux-c6x.org
> Cc: Richard Kuo <rkuo@codeaurora.org>
> Cc: linux-hexagon@vger.kernel.org
> Cc: linux-metag@vger.kernel.org
> Cc: Jonas Bonn <jonas@southpole.se>
> Cc: linux@lists.openrisc.net
> Cc: Chen Liqin <liqin.linux@gmail.com>
> Cc: Lennox Wu <lennox.wu@gmail.com>
> Cc: Chris Metcalf <cmetcalf@tilera.com>
> Cc: Guan Xuetao <gxt@mprc.pku.edu.cn>
> ---
> Is this the approach we want to take to keep the default syscall list
> minimal? We could for example have made renameat2 use the renameat
> syscall number for new arches, but it seemed best to leave a gap for new
> arches to improve consistency of numbering.

I think leaving the hole is best.

> This patch is a no-op for arches in tree, so there's no harm for this to
> wait for the v3.16 merge window.

Sounds good. I guess I'll have to put this into my asm-generic tree
then, unless I can get the nios2 maintainers to pick it up.

If you don't mind, can you submit the first two patches to Linus
directly?

	Arnd

Re: [RFC 3/3] asm-generic: Drop renameat syscall from default list

[James Hogan]

On 23 April 2014 13:18, Arnd Bergmann <arnd@arndb.de> wrote:
> On Wednesday 23 April 2014, James Hogan wrote:
>> The new renameat2 syscall provides all the functionality provided by the
>> renameat syscall and adds flags, so future architectures won't need to
>> include renameat.
>>
>> Therefore drop the renameat syscall from the generic syscall list unless
>> __ARCH_WANT_RENAMEAT is defined by the architecture's unistd.h prior to
>> including asm-generic/unistd.h, and adjust all architectures using the
>> generic syscall list to define it so that no in-tree architectures are
>> affected.
>
> I should have read this one before replying to patch 2 ;-)
>
>> Signed-off-by: James Hogan <james.hogan@imgtec.com>
>> Cc: Arnd Bergmann <arnd@arndb.de>
>> Cc: linux-arch@vger.kernel.org
>> Cc: Vineet Gupta <vgupta@synopsys.com>
>> Cc: Catalin Marinas <catalin.marinas@arm.com>
>> Cc: Will Deacon <will.deacon@arm.com>
>> Cc: linux-arm-kernel@lists.infradead.org
>> Cc: Mark Salter <msalter@redhat.com>
>> Cc: Aurelien Jacquiot <a-jacquiot@ti.com>
>> Cc: linux-c6x-dev@linux-c6x.org
>> Cc: Richard Kuo <rkuo@codeaurora.org>
>> Cc: linux-hexagon@vger.kernel.org
>> Cc: linux-metag@vger.kernel.org
>> Cc: Jonas Bonn <jonas@southpole.se>
>> Cc: linux@lists.openrisc.net
>> Cc: Chen Liqin <liqin.linux@gmail.com>
>> Cc: Lennox Wu <lennox.wu@gmail.com>
>> Cc: Chris Metcalf <cmetcalf@tilera.com>
>> Cc: Guan Xuetao <gxt@mprc.pku.edu.cn>
>> ---
>> Is this the approach we want to take to keep the default syscall list
>> minimal? We could for example have made renameat2 use the renameat
>> syscall number for new arches, but it seemed best to leave a gap for new
>> arches to improve consistency of numbering.
>
> I think leaving the hole is best.
>
>> This patch is a no-op for arches in tree, so there's no harm for this to
>> wait for the v3.16 merge window.
>
> Sounds good. I guess I'll have to put this into my asm-generic tree
> then, unless I can get the nios2 maintainers to pick it up.

Okay, thanks.

> If you don't mind, can you submit the first two patches to Linus
> directly?

It appears Miklos Szeredi beat me to it with patch 1 (adding renameat2
syscall to asm-generic unistd.h), and will be submitting it to Linus
at some point as part of his renameat2 series.
Miklos: Do you think it makes sense for you to include my second patch
in your series too since it's renameat2 related?
http://marc.info/?l=linux-kernel&m=139824773305016&w=2

Otherwise I'm happy to take it or both patches for v3.15.

Cheers
James

Re: [RFC 3/3] asm-generic: Drop renameat syscall from default list

[Szeredi Miklos]

On Wed, Apr 23, 2014 at 2:41 PM, James Hogan <james.hogan@imgtec.com> wrote:

> It appears Miklos Szeredi beat me to it with patch 1 (adding renameat2
> syscall to asm-generic unistd.h), and will be submitting it to Linus
> at some point as part of his renameat2 series.
> Miklos: Do you think it makes sense for you to include my second patch
> in your series too since it's renameat2 related?
> http://marc.info/?l=linux-kernel&m=139824773305016&w=2

I've queued up the first two patches with acks from Arnd.

Thanks,
Miklos

Re: [RFC 3/3] asm-generic: Drop renameat syscall from default list

[James Hogan]

Hi Miklos,

On 29/04/14 12:24, Szeredi Miklos wrote:
> On Wed, Apr 23, 2014 at 2:41 PM, James Hogan <james.hogan@imgtec.com> wrote:
> 
>> It appears Miklos Szeredi beat me to it with patch 1 (adding renameat2
>> syscall to asm-generic unistd.h), and will be submitting it to Linus
>> at some point as part of his renameat2 series.
>> Miklos: Do you think it makes sense for you to include my second patch
>> in your series too since it's renameat2 related?
>> http://marc.info/?l=linux-kernel&m=139824773305016&w=2
> 
> I've queued up the first two patches with acks from Arnd.

Were you planning to send a pull request for your renameat2 patches for
v3.15?

Cheers
James