linux-kernel - [PATCH] fs: xfs: libxfs: constify xfs

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Message-Id: <1480268101-30384-1-git-send-email-bhumirks@gmail.com>
Date:   Sun, 27 Nov 2016 23:05:01 +0530
From:   Bhumika Goyal <bhumirks@...il.com>
To:     julia.lawall@...6.fr, david@...morbit.com,
        linux-xfs@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Bhumika Goyal <bhumirks@...il.com>
Subject: [PATCH] fs: xfs: libxfs: constify xfs_nameops structures

Declare the structure xfs_nameops as const as it is only stored in the
m_dirnameops field of a xfs_mount structure. This field is of type
const struct xfs_nameops *, so xfs_nameops structures having this
property can be declared as const.
Done using Coccinelle:
@r1 disable optional_qualifier @
identifier i;
position p;
@@
static struct xfs_nameops i@p = {...};

@ok1@
identifier r1.i;
position p;
struct xfs_mount mp;
@@
mp.m_dirnameops=&i@p

@bad@
position p!={r1.p,ok1.p};
identifier r1.i;
@@
i@p

@depends on !bad disable optional_qualifier@
identifier r1.i;
@@
static
+const
struct xfs_nameops i={...};

@depends on !bad disable optional_qualifier@
identifier r1.i;
@@
+const
struct xfs_nameops i;

File size before:
   text	   data	    bss	    dec	    hex	filename
   5302	     85	      0	   5387	   150b	fs/xfs/libxfs/xfs_dir2.o

File size after:
   text	   data	    bss	    dec	    hex	filename
   5318	     69	      0	   5387	   150b	fs/xfs/libxfs/xfs_dir2.o

Signed-off-by: Bhumika Goyal <bhumirks@...il.com>
---
 fs/xfs/libxfs/xfs_dir2.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/xfs/libxfs/xfs_dir2.c b/fs/xfs/libxfs/xfs_dir2.c
index 20a96dd..c58d72c 100644
--- a/fs/xfs/libxfs/xfs_dir2.c
+++ b/fs/xfs/libxfs/xfs_dir2.c
@@ -93,7 +93,7 @@
 	return result;
 }
 
-static struct xfs_nameops xfs_ascii_ci_nameops = {
+static const struct xfs_nameops xfs_ascii_ci_nameops = {
 	.hashname	= xfs_ascii_ci_hashname,
 	.compname	= xfs_ascii_ci_compname,
 };
-- 
1.9.1