Ocfs2 devel - Mar 2013 - [PATCH 1/2] ocfs2: Delay inode update transactions after verifying the input flags

There is no need to start the inode update transactions before/while verifying
the input flags.  As a refinement, this patch delay the transactions utill the
pre-check up is ok.

Signed-off-by: Jie Liu <jeff.liu at oracle.com>
Cc: Joel Becker <jlbec at evilplan.org>
Cc: Mark Fasheh <mfasheh at suse.com>
---
 fs/ocfs2/ioctl.c |   18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/fs/ocfs2/ioctl.c b/fs/ocfs2/ioctl.c
index f20edcb..c739c24 100644
--- a/fs/ocfs2/ioctl.c
+++ b/fs/ocfs2/ioctl.c
@@ -101,13 +101,6 @@ static int ocfs2_set_inode_attr(struct inode *inode,
unsigned flags,
 	if (!S_ISDIR(inode->i_mode))
 		flags &= ~OCFS2_DIRSYNC_FL;
 
-	handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
-	if (IS_ERR(handle)) {
-		status = PTR_ERR(handle);
-		mlog_errno(status);
-		goto bail_unlock;
-	}
-
 	oldflags = ocfs2_inode->ip_attr;
 	flags = flags & mask;
 	flags |= oldflags & ~mask;
@@ -120,7 +113,14 @@ static int ocfs2_set_inode_attr(struct inode *inode,
unsigned flags,
 	if ((oldflags & OCFS2_IMMUTABLE_FL) || ((flags ^ oldflags) &
 		(OCFS2_APPEND_FL | OCFS2_IMMUTABLE_FL))) {
 		if (!capable(CAP_LINUX_IMMUTABLE))
-			goto bail_commit;
+			goto bail_unlock;
+	}
+
+	handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
+	if (IS_ERR(handle)) {
+		status = PTR_ERR(handle);
+		mlog_errno(status);
+		goto bail_unlock;
 	}
 
 	ocfs2_inode->ip_attr = flags;
@@ -130,8 +130,8 @@ static int ocfs2_set_inode_attr(struct inode *inode,
unsigned flags,
 	if (status < 0)
 		mlog_errno(status);
 
-bail_commit:
 	ocfs2_commit_trans(osb, handle);
+
 bail_unlock:
 	ocfs2_inode_unlock(inode, 1);
 bail:
-- 
1.7.9.5

On Mon, Mar 11, 2013 at 01:29:19PM +0800, Jeff Liu
wrote:
> There is no need to start the inode update transactions before/while
verifying
> the input flags.  As a refinement, this patch delay the transactions utill
the
> pre-check up is ok.
> 
> Signed-off-by: Jie Liu <jeff.liu at oracle.com>
> Cc: Joel Becker <jlbec at evilplan.org>
> Cc: Mark Fasheh <mfasheh at suse.com>
Acked-by: Joel Becker <jlbec at evilplan.org>
> ---
>  fs/ocfs2/ioctl.c |   18 +++++++++---------
>  1 file changed, 9 insertions(+), 9 deletions(-)
> 
> diff --git a/fs/ocfs2/ioctl.c b/fs/ocfs2/ioctl.c
> index f20edcb..c739c24 100644
> --- a/fs/ocfs2/ioctl.c
> +++ b/fs/ocfs2/ioctl.c
> @@ -101,13 +101,6 @@ static int ocfs2_set_inode_attr(struct inode *inode,
unsigned flags,
>  	if (!S_ISDIR(inode->i_mode))
>  		flags &= ~OCFS2_DIRSYNC_FL;
>  
> -	handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
> -	if (IS_ERR(handle)) {
> -		status = PTR_ERR(handle);
> -		mlog_errno(status);
> -		goto bail_unlock;
> -	}
> -
>  	oldflags = ocfs2_inode->ip_attr;
>  	flags = flags & mask;
>  	flags |= oldflags & ~mask;
> @@ -120,7 +113,14 @@ static int ocfs2_set_inode_attr(struct inode *inode,
unsigned flags,
>  	if ((oldflags & OCFS2_IMMUTABLE_FL) || ((flags ^ oldflags) &
>  		(OCFS2_APPEND_FL | OCFS2_IMMUTABLE_FL))) {
>  		if (!capable(CAP_LINUX_IMMUTABLE))
> -			goto bail_commit;
> +			goto bail_unlock;
> +	}
> +
> +	handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
> +	if (IS_ERR(handle)) {
> +		status = PTR_ERR(handle);
> +		mlog_errno(status);
> +		goto bail_unlock;
>  	}
>  
>  	ocfs2_inode->ip_attr = flags;
> @@ -130,8 +130,8 @@ static int ocfs2_set_inode_attr(struct inode *inode,
unsigned flags,
>  	if (status < 0)
>  		mlog_errno(status);
>  
> -bail_commit:
>  	ocfs2_commit_trans(osb, handle);
> +
>  bail_unlock:
>  	ocfs2_inode_unlock(inode, 1);
>  bail:
> -- 
> 1.7.9.5
-- 

"Reader, suppose you were and idiot.  And suppose you were a member of
 Congress.  But I repeat myself."
	- Mark Twain

			http://www.jlbec.org/
			jlbec at evilplan.org