[PATCH 1038/1285] Replace numeric parameter like 0444 with macro

[PATCH 1038/1285] Replace numeric parameter like 0444 with macro

[Baole Ni]

I find that the developers often just specified the numeric value
when calling a macro which is defined with a parameter for access permission.
As we know, these numeric value for access permission have had the corresponding macro,
and that using macro can improve the robustness and readability of the code,
thus, I suggest replacing the numeric parameter with the macro.

Signed-off-by: Chuansheng Liu <chuansheng.liu@intel.com>
Signed-off-by: Baole Ni <baolex.ni@intel.com>
---
 fs/ext4/crypto.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/ext4/crypto.c b/fs/ext4/crypto.c
index 6a6c273..40877aa 100644
--- a/fs/ext4/crypto.c
+++ b/fs/ext4/crypto.c
@@ -42,10 +42,10 @@
 static unsigned int num_prealloc_crypto_pages = 32;
 static unsigned int num_prealloc_crypto_ctxs = 128;
 
-module_param(num_prealloc_crypto_pages, uint, 0444);
+module_param(num_prealloc_crypto_pages, uint, S_IRUSR | S_IRGRP | S_IROTH);
 MODULE_PARM_DESC(num_prealloc_crypto_pages,
 		 "Number of crypto pages to preallocate");
-module_param(num_prealloc_crypto_ctxs, uint, 0444);
+module_param(num_prealloc_crypto_ctxs, uint, S_IRUSR | S_IRGRP | S_IROTH);
 MODULE_PARM_DESC(num_prealloc_crypto_ctxs,
 		 "Number of crypto contexts to preallocate");
 
-- 
2.9.2

Re: [PATCH 1038/1285] Replace numeric parameter like 0444 with macro

[Theodore Ts'o]

On Tue, Aug 02, 2016 at 08:10:47PM +0800, Baole Ni wrote:
> I find that the developers often just specified the numeric value
> when calling a macro which is defined with a parameter for access permission.
> As we know, these numeric value for access permission have had the corresponding macro,
> and that using macro can improve the robustness and readability of the code,
> thus, I suggest replacing the numeric parameter with the macro.

I actually find using the macros significantly **decrease* the
readiability of the code.  A quick glance at 0644 quickly tells you
what the permissions are.  Parsing S_IRUSR | S_IRGRP | S_IROTH takes
longer, and is more error prone.

NACK.

					- Ted