[PATCHv9 0/5] Getting rid of get_unused_fd()

Hi,

Please find the 9th revision of my patchset to remove
get_unused_fd() macro.

In linux-next, tag next-20141013, they're currently:

- 33 calls to fd_install()
       with one call part of anon_inode_getfd()
- 27 calls to get_unused_fd_flags()
       with one call part of anon_inode_getfd()
       with another part of get_unused_fd() macro
- 13 calls to anon_inode_getfd()
-  8 calls to anon_inode_getfile()
       with one call part of anon_inode_getfd()
-  5 calls to get_unused_fd()

The following patchset replaces the 5 last calls to
get_unused_fd() by calls to get_unused_fd_flags(0)
and remove the macro so that it won't be used in
newer code.

For some detailed background information, please have
a look at my previous patchset's cover letter[1].

Changes from patchset v8[1]
- fanotify: enable close-on-exec on events' fd when requested in
    fanotify_init()
  DROPPED: applied upstream, commit 0b37e097a648.
- reduce the amount of explanation in cover letter

[1] http://lkml.kernel.org/r/cover.1411562410.git.ydroneaud@opteya.com

Yann Droneaud (5):
  ia64: trivial: replace get_unused_fd() by get_unused_fd_flags(0)
  ppc/cell: trivial: replace get_unused_fd() by get_unused_fd_flags(0)
  binfmt_misc: trivial: replace get_unused_fd() by
    get_unused_fd_flags(0)
  file: trivial: replace get_unused_fd() by get_unused_fd_flags(0)
  file: remove get_unused_fd() macro

 arch/ia64/kernel/perfmon.c                | 2 +-
 arch/powerpc/platforms/cell/spufs/inode.c | 4 ++--
 fs/binfmt_misc.c                          | 2 +-
 fs/file.c                                 | 2 +-
 include/linux/file.h                      | 1 -
 5 files changed, 5 insertions(+), 6 deletions(-)

-- 
1.9.3

This patch replaces calls to get_unused_fd() with equivalent call to
get_unused_fd_flags(0) to preserve current behavor for existing code.

In a further patch, get_unused_fd() will be removed so that new code
start using get_unused_fd_flags(), with the hope O_CLOEXEC could be
used, either by default or choosen by userspace.

Link: http://lkml.kernel.org/r/cover.1413223900.git.ydroneaud@opteya.com
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: trivial@kernel.org
Signed-off-by: Yann Droneaud <redacted>
---
 arch/powerpc/platforms/cell/spufs/inode.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/platforms/cell/spufs/inode.c b/arch/powerpc/platforms/cell/spufs/inode.c
index 87ba7cf99cd7..51effcec30d8 100644
--- a/arch/powerpc/platforms/cell/spufs/inode.c
+++ b/arch/powerpc/platforms/cell/spufs/inode.c

@@ -301,7 +301,7 @@ static int spufs_context_open(struct path *path)
 	int ret;
 	struct file *filp;
 
-	ret = get_unused_fd();
+	ret = get_unused_fd_flags(0);
 	if (ret < 0)
 		return ret;
 

@@ -518,7 +518,7 @@ static int spufs_gang_open(struct path *path)
 	int ret;
 	struct file *filp;
 
-	ret = get_unused_fd();
+	ret = get_unused_fd_flags(0);
 	if (ret < 0)
 		return ret;
 

-- 
1.9.3

On Mon, 2014-10-13 at 21:30 +0200, Yann Droneaud wrote:

This patch replaces calls to get_unused_fd() with equivalent call to
get_unused_fd_flags(0) to preserve current behavor for existing code.

In a further patch, get_unused_fd() will be removed so that new code
start using get_unused_fd_flags(), with the hope O_CLOEXEC could be
used, either by default or choosen by userspace.

Link: http://lkml.kernel.org/r/cover.1413223900.git.ydroneaud@opteya.com
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: trivial@kernel.org
Signed-off-by: Yann Droneaud <redacted>

This is fine by me, do you want an ack, or do you want us to take it via the
powerpc tree?

If the former:

Acked-by: Michael Ellerman <mpe@ellerman.id.au>


cheers

Hi,

Le mardi 14 octobre 2014 à 12:57 +1100, Michael Ellerman a écrit :

On Mon, 2014-10-13 at 21:30 +0200, Yann Droneaud wrote:

quoted

This patch replaces calls to get_unused_fd() with equivalent call to
get_unused_fd_flags(0) to preserve current behavor for existing code.

In a further patch, get_unused_fd() will be removed so that new code
start using get_unused_fd_flags(), with the hope O_CLOEXEC could be
used, either by default or choosen by userspace.

Link: http://lkml.kernel.org/r/cover.1413223900.git.ydroneaud@opteya.com
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: trivial@kernel.org
Signed-off-by: Yann Droneaud <redacted>

This is fine by me, do you want an ack, or do you want us to take it via the
powerpc tree?

The patch was added in -mm by Andrew, so I guess the patch will be
merged sooner or later.

Anyway, you could investigate to check if O_CLOEXEC could be used
instead of 0 in call to get_unused_fd_flags().

If the former:

Acked-by: Michael Ellerman <mpe@ellerman.id.au>

Thanks a lot.

Regards.

-- 
Yann Droneaud
OPTEYA