[PATCH 2/7] f2fs: remove the unuseful "issue_tail" list

[PATCH 2/7] f2fs: remove the unuseful "issue_tail" list

[Gu Zheng]

With the issue_list and dispatch_list, we can handle flush_merge
already, so remove the useless "issue_tail" list.

Signed-off-by: Gu Zheng <guz.fnst@cn.fujitsu.com>
---
 fs/f2fs/f2fs.h    |    1 -
 fs/f2fs/segment.c |    5 ++---
 2 files changed, 2 insertions(+), 4 deletions(-)

diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 2ecac83..90109fa 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -358,7 +358,6 @@ struct f2fs_sm_info {
 	struct flush_cmd *issue_list;		/* list for command issue */
 	struct flush_cmd *dispatch_list;	/* list for command dispatch */
 	spinlock_t issue_lock;			/* for issue list lock */
-	struct flush_cmd *issue_tail;		/* list tail of issue list */
 };
 
 /*
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 524b7ed..8a6fe2a 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -209,7 +209,7 @@ repeat:
 	spin_lock(&sm_i->issue_lock);
 	if (sm_i->issue_list) {
 		sm_i->dispatch_list = sm_i->issue_list;
-		sm_i->issue_list = sm_i->issue_tail = NULL;
+		sm_i->issue_list = NULL;
 	}
 	spin_unlock(&sm_i->issue_lock);
 
@@ -250,10 +250,9 @@ int f2fs_issue_flush(struct f2fs_sb_info *sbi)
 
 	spin_lock(&sm_i->issue_lock);
 	if (sm_i->issue_list)
-		sm_i->issue_tail->next = cmd;
+		sm_i->issue_list->next = cmd;
 	else
 		sm_i->issue_list = cmd;
-	sm_i->issue_tail = cmd;
 	spin_unlock(&sm_i->issue_lock);
 
 	if (!sm_i->dispatch_list)
-- 
1.7.7

Re: [PATCH 2/7] f2fs: remove the unuseful "issue_tail" list

[Gu Zheng]

Hi All,
There seems to be a mistake in this patch, please ignore it.
I'll send a reworked one later.

Regards,
Gu 
On 04/11/2014 05:49 PM, Gu Zheng wrote:

> With the issue_list and dispatch_list, we can handle flush_merge
> already, so remove the useless "issue_tail" list.
> 
> Signed-off-by: Gu Zheng <guz.fnst@cn.fujitsu.com>
> ---
>  fs/f2fs/f2fs.h    |    1 -
>  fs/f2fs/segment.c |    5 ++---
>  2 files changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> index 2ecac83..90109fa 100644
> --- a/fs/f2fs/f2fs.h
> +++ b/fs/f2fs/f2fs.h
> @@ -358,7 +358,6 @@ struct f2fs_sm_info {
>  	struct flush_cmd *issue_list;		/* list for command issue */
>  	struct flush_cmd *dispatch_list;	/* list for command dispatch */
>  	spinlock_t issue_lock;			/* for issue list lock */
> -	struct flush_cmd *issue_tail;		/* list tail of issue list */
>  };
>  
>  /*
> diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
> index 524b7ed..8a6fe2a 100644
> --- a/fs/f2fs/segment.c
> +++ b/fs/f2fs/segment.c
> @@ -209,7 +209,7 @@ repeat:
>  	spin_lock(&sm_i->issue_lock);
>  	if (sm_i->issue_list) {
>  		sm_i->dispatch_list = sm_i->issue_list;
> -		sm_i->issue_list = sm_i->issue_tail = NULL;
> +		sm_i->issue_list = NULL;
>  	}
>  	spin_unlock(&sm_i->issue_lock);
>  
> @@ -250,10 +250,9 @@ int f2fs_issue_flush(struct f2fs_sb_info *sbi)
>  
>  	spin_lock(&sm_i->issue_lock);
>  	if (sm_i->issue_list)
> -		sm_i->issue_tail->next = cmd;
> +		sm_i->issue_list->next = cmd;
>  	else
>  		sm_i->issue_list = cmd;
> -	sm_i->issue_tail = cmd;
>  	spin_unlock(&sm_i->issue_lock);
>  
>  	if (!sm_i->dispatch_list)