[PATCH v2] ocfs2: fix a static checker warning

[PATCH v2] ocfs2: fix a static checker warning

[Gang He]

This patch will fix a static code checker warning, which looks 
like below,
fs/ocfs2/inode.c:179 ocfs2_iget()
warn: passing zero to 'ERR_PTR'

this warning was caused by the 
commit d56a8f32e4c6 ("ocfs2: check/fix inode block for online file check").
after apply this patch, the error return value will not be NULL(zero).

Signed-off-by: Gang He <ghe@suse.com>
---
 fs/ocfs2/inode.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/ocfs2/inode.c b/fs/ocfs2/inode.c
index 382401d..1a1e007 100644
--- a/fs/ocfs2/inode.c
+++ b/fs/ocfs2/inode.c
@@ -136,7 +136,7 @@ struct inode *ocfs2_ilookup(struct super_block *sb, u64 blkno)
 struct inode *ocfs2_iget(struct ocfs2_super *osb, u64 blkno, unsigned flags,
 			 int sysfile_type)
 {
-	int rc = 0;
+	int rc = -ESTALE;
 	struct inode *inode = NULL;
 	struct super_block *sb = osb->sb;
 	struct ocfs2_find_inode_args args;
-- 
1.8.5.6

Re: [PATCH v2] ocfs2: fix a static checker warning

[Andrew Morton]

On Tue, 23 May 2017 13:17:14 +0800 Gang He <ghe@suse.com> wrote:

> This patch will fix a static code checker warning, which looks 
> like below,
> fs/ocfs2/inode.c:179 ocfs2_iget()
> warn: passing zero to 'ERR_PTR'
> 
> this warning was caused by the 
> commit d56a8f32e4c6 ("ocfs2: check/fix inode block for online file check").
> after apply this patch, the error return value will not be NULL(zero).
> 
> Signed-off-by: Gang He <ghe@suse.com>
> ---
>  fs/ocfs2/inode.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/fs/ocfs2/inode.c b/fs/ocfs2/inode.c
> index 382401d..1a1e007 100644
> --- a/fs/ocfs2/inode.c
> +++ b/fs/ocfs2/inode.c
> @@ -136,7 +136,7 @@ struct inode *ocfs2_ilookup(struct super_block *sb, u64 blkno)
>  struct inode *ocfs2_iget(struct ocfs2_super *osb, u64 blkno, unsigned flags,
>  			 int sysfile_type)
>  {
> -	int rc = 0;
> +	int rc = -ESTALE;
>  	struct inode *inode = NULL;
>  	struct super_block *sb = osb->sb;
>  	struct ocfs2_find_inode_args args;

hm, OK, thanks.  The resulting code still looks rather weird.  Could
someone who works in this area please take a look?

Re: [PATCH v2] ocfs2: fix a static checker warning

[Gang He]

Hello Andrew,

I am sorry that I did not write which static code checker tool, since I did not get the name from Dan, I think the tool should be like Coverity code checking tool.
Second, set the initial value of local variable rc to -ESTALE from zero, this change will make the code logic is strict consistent with before the  commit d56a8f32e4c6 ("ocfs2: check/fix inode block for online file check"), although it is very difficult to meet this problem in the real environment. 


Thanks
Gang 


>>> 
> On Tue, 23 May 2017 13:17:14 +0800 Gang He <ghe@suse.com> wrote:
> 
>> This patch will fix a static code checker warning, which looks 
>> like below,
>> fs/ocfs2/inode.c:179 ocfs2_iget()
>> warn: passing zero to 'ERR_PTR'
>> 
>> this warning was caused by the 
>> commit d56a8f32e4c6 ("ocfs2: check/fix inode block for online file check").
>> after apply this patch, the error return value will not be NULL(zero).
>> 
>> Signed-off-by: Gang He <ghe@suse.com>
>> ---
>>  fs/ocfs2/inode.c | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>> 
>> diff --git a/fs/ocfs2/inode.c b/fs/ocfs2/inode.c
>> index 382401d..1a1e007 100644
>> --- a/fs/ocfs2/inode.c
>> +++ b/fs/ocfs2/inode.c
>> @@ -136,7 +136,7 @@ struct inode *ocfs2_ilookup(struct super_block *sb, u64 
> blkno)
>>  struct inode *ocfs2_iget(struct ocfs2_super *osb, u64 blkno, unsigned 
> flags,
>>  			 int sysfile_type)
>>  {
>> -	int rc = 0;
>> +	int rc = -ESTALE;
>>  	struct inode *inode = NULL;
>>  	struct super_block *sb = osb->sb;
>>  	struct ocfs2_find_inode_args args;
> 
> hm, OK, thanks.  The resulting code still looks rather weird.  Could
> someone who works in this area please take a look?

Re: [Ocfs2-devel] [PATCH v2] ocfs2: fix a static checker warning

[Eric Ren]

On 05/23/2017 01:17 PM, Gang He wrote:
> This patch will fix a static code checker warning, which looks
> like below,
> fs/ocfs2/inode.c:179 ocfs2_iget()
> warn: passing zero to 'ERR_PTR'
>
> this warning was caused by the
> commit d56a8f32e4c6 ("ocfs2: check/fix inode block for online file check").
> after apply this patch, the error return value will not be NULL(zero).
>
> Signed-off-by: Gang He <ghe@suse.com>
Looks good to me.

Reviewed-by: Eric Ren <zren@suse.com>
> ---
>   fs/ocfs2/inode.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/fs/ocfs2/inode.c b/fs/ocfs2/inode.c
> index 382401d..1a1e007 100644
> --- a/fs/ocfs2/inode.c
> +++ b/fs/ocfs2/inode.c
> @@ -136,7 +136,7 @@ struct inode *ocfs2_ilookup(struct super_block *sb, u64 blkno)
>   struct inode *ocfs2_iget(struct ocfs2_super *osb, u64 blkno, unsigned flags,
>   			 int sysfile_type)
>   {
> -	int rc = 0;
> +	int rc = -ESTALE;
>   	struct inode *inode = NULL;
>   	struct super_block *sb = osb->sb;
>   	struct ocfs2_find_inode_args args;