[PATCH] xfs: don't cast string literals

[PATCH] xfs: don't cast string literals

[Eric Sandeen]

The commit:

a9273ca5 xfs: convert attr to use unsigned names

added these (unsigned char *) casts, but then the _SIZE macros
return "7" - size of a pointer minus one - not the length of
the string.  This is harmless in the kernel, because the _SIZE
macros are not used, but as we sync up with userspace, this will
matter.

I don't think the cast is necessary; i.e. assigning the string
literal to an unsigned char *, or passing it to a function
expecting an unsigned char *, should be ok, right?

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
---

I can send the xfsprogs version if you like, if this passes
muster ;)

(the other option is to cast it back to a (char *) in the sizeof
but then things are just getting weird IMHO...)

diff --git a/fs/xfs/libxfs/xfs_format.h b/fs/xfs/libxfs/xfs_format.h
index 4daaa66..ff22a4d 100644
--- a/fs/xfs/libxfs/xfs_format.h
+++ b/fs/xfs/libxfs/xfs_format.h
@@ -1453,8 +1453,8 @@ struct xfs_acl {
 		sizeof(struct xfs_acl_entry) * XFS_ACL_MAX_ENTRIES((mp)))
 
 /* On-disk XFS extended attribute names */
-#define SGI_ACL_FILE		(unsigned char *)"SGI_ACL_FILE"
-#define SGI_ACL_DEFAULT		(unsigned char *)"SGI_ACL_DEFAULT"
+#define SGI_ACL_FILE		"SGI_ACL_FILE"
+#define SGI_ACL_DEFAULT		"SGI_ACL_DEFAULT"
 #define SGI_ACL_FILE_SIZE	(sizeof(SGI_ACL_FILE)-1)
 #define SGI_ACL_DEFAULT_SIZE	(sizeof(SGI_ACL_DEFAULT)-1)
 

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Re: [PATCH] xfs: don't cast string literals

[Brian Foster]

On Wed, May 13, 2015 at 06:16:48PM -0500, Eric Sandeen wrote:
> The commit:
> 
> a9273ca5 xfs: convert attr to use unsigned names
> 
> added these (unsigned char *) casts, but then the _SIZE macros
> return "7" - size of a pointer minus one - not the length of
> the string.  This is harmless in the kernel, because the _SIZE
> macros are not used, but as we sync up with userspace, this will
> matter.
> 
> I don't think the cast is necessary; i.e. assigning the string
> literal to an unsigned char *, or passing it to a function
> expecting an unsigned char *, should be ok, right?
> 
> Signed-off-by: Eric Sandeen <sandeen@redhat.com>
> ---
> 
> I can send the xfsprogs version if you like, if this passes
> muster ;)
> 
> (the other option is to cast it back to a (char *) in the sizeof
> but then things are just getting weird IMHO...)
> 

Heh, the cast inside the directive looks weird enough to me in the first
place. In this case it seems spurious, so I'm fine with it:

Reviewed-by: Brian Foster <bfoster@redhat.com>

> diff --git a/fs/xfs/libxfs/xfs_format.h b/fs/xfs/libxfs/xfs_format.h
> index 4daaa66..ff22a4d 100644
> --- a/fs/xfs/libxfs/xfs_format.h
> +++ b/fs/xfs/libxfs/xfs_format.h
> @@ -1453,8 +1453,8 @@ struct xfs_acl {
>  		sizeof(struct xfs_acl_entry) * XFS_ACL_MAX_ENTRIES((mp)))
>  
>  /* On-disk XFS extended attribute names */
> -#define SGI_ACL_FILE		(unsigned char *)"SGI_ACL_FILE"
> -#define SGI_ACL_DEFAULT		(unsigned char *)"SGI_ACL_DEFAULT"
> +#define SGI_ACL_FILE		"SGI_ACL_FILE"
> +#define SGI_ACL_DEFAULT		"SGI_ACL_DEFAULT"
>  #define SGI_ACL_FILE_SIZE	(sizeof(SGI_ACL_FILE)-1)
>  #define SGI_ACL_DEFAULT_SIZE	(sizeof(SGI_ACL_DEFAULT)-1)
>  
> 
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