[PATCH] Staging : lustre: Struct file_operations should be const

[PATCH] Staging : lustre: Struct file_operations should be const

[Shraddha Barke]

Declare the file_operations structure ll_file_operations as const, as done
elsewhere in the kernel, as there are no modifications to its fields.

Problem found using checkpatch:

WARNING: struct file_operations should normally be const

Signed-off-by: Shraddha Barke <shraddha.6596@gmail.com>
---
 drivers/staging/lustre/lustre/llite/file.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/staging/lustre/lustre/llite/file.c b/drivers/staging/lustre/lustre/llite/file.c
index dcd0c6d..2c467bf 100644
--- a/drivers/staging/lustre/lustre/llite/file.c
+++ b/drivers/staging/lustre/lustre/llite/file.c
@@ -3116,7 +3116,7 @@ int ll_inode_permission(struct inode *inode, int mask)
 }
 
 /* -o localflock - only provides locally consistent flock locks */
-struct file_operations ll_file_operations = {
+const struct file_operations ll_file_operations = {
 	.read_iter = ll_file_read_iter,
 	.write_iter = ll_file_write_iter,
 	.unlocked_ioctl = ll_file_ioctl,
@@ -3129,7 +3129,7 @@ struct file_operations ll_file_operations = {
 	.flush	  = ll_flush
 };
 
-struct file_operations ll_file_operations_flock = {
+const struct file_operations ll_file_operations_flock = {
 	.read_iter    = ll_file_read_iter,
 	.write_iter   = ll_file_write_iter,
 	.unlocked_ioctl = ll_file_ioctl,
@@ -3145,7 +3145,7 @@ struct file_operations ll_file_operations_flock = {
 };
 
 /* These are for -o noflock - to return ENOSYS on flock calls */
-struct file_operations ll_file_operations_noflock = {
+const struct file_operations ll_file_operations_noflock = {
 	.read_iter    = ll_file_read_iter,
 	.write_iter   = ll_file_write_iter,
 	.unlocked_ioctl = ll_file_ioctl,
-- 
2.1.0

Re: [PATCH] Staging : lustre: Struct file_operations should be const

[Sudip Mukherjee]

On Mon, Aug 03, 2015 at 11:17:06AM +0530, Shraddha Barke wrote:
> Declare the file_operations structure ll_file_operations as const, as done
> elsewhere in the kernel, as there are no modifications to its fields.
> 
> Problem found using checkpatch:
> 
> WARNING: struct file_operations should normally be const
> 
> Signed-off-by: Shraddha Barke <shraddha.6596@gmail.com>
> ---
You have not even build tested your patch before sending. :(
	
drivers/staging/lustre/lustre/llite/file.c:3119:30: error: conflicting type qualifiers for ‘ll_file_operations’
 const struct file_operations ll_file_operations = {
                              ^
In file included from drivers/staging/lustre/lustre/llite/file.c:48:0:
drivers/staging/lustre/lustre/llite/llite_internal.h:710:31: note: previous declaration of ‘ll_file_operations’ was here
 extern struct file_operations ll_file_operations;
                               ^
drivers/staging/lustre/lustre/llite/file.c:3132:30: error: conflicting type qualifiers for ‘ll_file_operations_flock’
 const struct file_operations ll_file_operations_flock = {
                              ^
In file included from drivers/staging/lustre/lustre/llite/file.c:48:0:
drivers/staging/lustre/lustre/llite/llite_internal.h:711:31: note: previous declaration of ‘ll_file_operations_flock’ was here
 extern struct file_operations ll_file_operations_flock;
                               ^
drivers/staging/lustre/lustre/llite/file.c:3148:30: error: conflicting type qualifiers for ‘ll_file_operations_noflock’
 const struct file_operations ll_file_operations_noflock = {
                              ^
In file included from drivers/staging/lustre/lustre/llite/file.c:48:0:
drivers/staging/lustre/lustre/llite/llite_internal.h:712:31: note: previous declaration of ‘ll_file_operations_noflock’ was here
 extern struct file_operations ll_file_operations_noflock;
                               ^
make[3]: *** [drivers/staging/lustre/lustre/llite/file.o] Error 1
make[2]: *** [drivers/staging/lustre/lustre/llite] Error 2
make[1]: *** [drivers/staging/lustre/lustre] Error 2
make: *** [_module_drivers/staging/lustre] Error 2

regards
sudip

[PATCH] Staging : lustre: Struct file_operations should be const

[Shraddha Barke]

This patch fixes the following checkpatch.pl warning:

WARNING: struct file_operations should normally be const

Signed-off-by: Shraddha Barke <shraddha.6596@gmail.com>
---
 drivers/staging/lustre/lustre/llite/file.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/lustre/lustre/llite/file.c b/drivers/staging/lustre/lustre/llite/file.c
index dcd0c6d..369a722 100644
--- a/drivers/staging/lustre/lustre/llite/file.c
+++ b/drivers/staging/lustre/lustre/llite/file.c
@@ -3116,7 +3116,7 @@ int ll_inode_permission(struct inode *inode, int mask)
 }
 
 /* -o localflock - only provides locally consistent flock locks */
-struct file_operations ll_file_operations = {
+const struct file_operations ll_file_operations = {
 	.read_iter = ll_file_read_iter,
 	.write_iter = ll_file_write_iter,
 	.unlocked_ioctl = ll_file_ioctl,
-- 
2.1.0

Re: [PATCH] Staging : lustre: Struct file_operations should be const

[Julia Lawall]

On Sun, 2 Aug 2015, Shraddha Barke wrote:

> This patch fixes the following checkpatch.pl warning:
> 
> WARNING: struct file_operations should normally be const

This is not the good way to write the message.  The information it conveys 
is "checkpatch generated this warning, so I have made some change 
(unspecified) that make checkpatch not complain".

A better approach would be to say:

Declare the file_operations structure ll_file_operations as const, as done 
elsewhere in the kernel, as there are no modifications to its fields.

Problem found using checkpatch.

This way the reader knows what was done, and what issues were taken into 
account when making the change.  At the same time, you still credit 
checkpatch for helping you find the problem

julia

> 
> Signed-off-by: Shraddha Barke <shraddha.6596@gmail.com>
> ---
>  drivers/staging/lustre/lustre/llite/file.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/staging/lustre/lustre/llite/file.c b/drivers/staging/lustre/lustre/llite/file.c
> index dcd0c6d..369a722 100644
> --- a/drivers/staging/lustre/lustre/llite/file.c
> +++ b/drivers/staging/lustre/lustre/llite/file.c
> @@ -3116,7 +3116,7 @@ int ll_inode_permission(struct inode *inode, int mask)
>  }
>  
>  /* -o localflock - only provides locally consistent flock locks */
> -struct file_operations ll_file_operations = {
> +const struct file_operations ll_file_operations = {
>  	.read_iter = ll_file_read_iter,
>  	.write_iter = ll_file_write_iter,
>  	.unlocked_ioctl = ll_file_ioctl,
> -- 
> 2.1.0
> 
>