linux-kernel - Re: [PATCH 7/8] fs/ceph: Use ERR

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Date:	Tue, 25 May 2010 16:30:46 -0700 (PDT)
From:	Sage Weil <sage@...dream.net>
To:	Julia Lawall <julia@...u.dk>
cc:	ceph-devel@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: Re: [PATCH 7/8] fs/ceph: Use ERR_CAST

Whoops, I queued this up in the ceph tree the other day.

Thanks!
sage


On Sat, 22 May 2010, Julia Lawall wrote:
> From: Julia Lawall <julia@...u.dk>
> 
> Use ERR_CAST(x) rather than ERR_PTR(PTR_ERR(x)).  The former makes more
> clear what is the purpose of the operation, which otherwise looks like a
> no-op.
> 
> In the case of fs/ceph/inode.c, ERR_CAST is not needed, because the type of
> the returned value is the same as the type of the enclosing function.
> 
> The semantic patch that makes this change is as follows:
> (http://coccinelle.lip6.fr/)
> 
> // <smpl>
> @@
> type T;
> T x;
> identifier f;
> @@
> 
> T f (...) { <+...
> - ERR_PTR(PTR_ERR(x))
> + x
>  ...+> }
> 
> @@
> expression x;
> @@
> 
> - ERR_PTR(PTR_ERR(x))
> + ERR_CAST(x)
> // </smpl>
> 
> Signed-off-by: Julia Lawall <julia@...u.dk>
> 
> ---
>  fs/ceph/dir.c    |    2 +-
>  fs/ceph/export.c |    2 +-
>  fs/ceph/file.c   |    2 +-
>  fs/ceph/inode.c  |    2 +-
>  fs/ceph/osdmap.c |    2 +-
>  fs/ceph/super.c  |    2 +-
>  6 files changed, 6 insertions(+), 6 deletions(-)
> 
> diff -u -p a/fs/ceph/dir.c b/fs/ceph/dir.c
> --- a/fs/ceph/dir.c
> +++ b/fs/ceph/dir.c
> @@ -587,7 +587,7 @@ static struct dentry *ceph_lookup(struct
>  		CEPH_MDS_OP_LOOKUPSNAP : CEPH_MDS_OP_LOOKUP;
>  	req = ceph_mdsc_create_request(mdsc, op, USE_ANY_MDS);
>  	if (IS_ERR(req))
> -		return ERR_PTR(PTR_ERR(req));
> +		return ERR_CAST(req);
>  	req->r_dentry = dget(dentry);
>  	req->r_num_caps = 2;
>  	/* we only need inode linkage */
> diff -u -p a/fs/ceph/export.c b/fs/ceph/export.c
> --- a/fs/ceph/export.c
> +++ b/fs/ceph/export.c
> @@ -133,7 +133,7 @@ static struct dentry *__cfh_to_dentry(st
>  		req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LOOKUPHASH,
>  					       USE_ANY_MDS);
>  		if (IS_ERR(req))
> -			return ERR_PTR(PTR_ERR(req));
> +			return ERR_CAST(req);
>  
>  		req->r_ino1 = vino;
>  		req->r_ino2.ino = cfh->parent_ino;
> diff -u -p a/fs/ceph/file.c b/fs/ceph/file.c
> --- a/fs/ceph/file.c
> +++ b/fs/ceph/file.c
> @@ -230,7 +230,7 @@ struct dentry *ceph_lookup_open(struct i
>  	/* do the open */
>  	req = prepare_open_request(dir->i_sb, flags, mode);
>  	if (IS_ERR(req))
> -		return ERR_PTR(PTR_ERR(req));
> +		return ERR_CAST(req);
>  	req->r_dentry = dget(dentry);
>  	req->r_num_caps = 2;
>  	if (flags & O_CREAT) {
> diff -u -p a/fs/ceph/inode.c b/fs/ceph/inode.c
> --- a/fs/ceph/inode.c
> +++ b/fs/ceph/inode.c
> @@ -69,7 +69,7 @@ struct inode *ceph_get_snapdir(struct in
>  
>  	BUG_ON(!S_ISDIR(parent->i_mode));
>  	if (IS_ERR(inode))
> -		return ERR_PTR(PTR_ERR(inode));
> +		return inode;
>  	inode->i_mode = parent->i_mode;
>  	inode->i_uid = parent->i_uid;
>  	inode->i_gid = parent->i_gid;
> diff -u -p a/fs/ceph/osdmap.c b/fs/ceph/osdmap.c
> --- a/fs/ceph/osdmap.c
> +++ b/fs/ceph/osdmap.c
> @@ -706,7 +706,7 @@ struct ceph_osdmap *osdmap_apply_increme
>  		     len, *p, end);
>  		newcrush = crush_decode(*p, min(*p+len, end));
>  		if (IS_ERR(newcrush))
> -			return ERR_PTR(PTR_ERR(newcrush));
> +			return ERR_CAST(newcrush);
>  	}
>  
>  	/* new flags? */
> diff -u -p a/fs/ceph/super.c b/fs/ceph/super.c
> --- a/fs/ceph/super.c
> +++ b/fs/ceph/super.c
> @@ -738,7 +738,7 @@ static struct dentry *open_root_dentry(s
>  	dout("open_root_inode opening '%s'\n", path);
>  	req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
>  	if (IS_ERR(req))
> -		return ERR_PTR(PTR_ERR(req));
> +		return ERR_CAST(req);
>  	req->r_path1 = kstrdup(path, GFP_NOFS);
>  	req->r_ino1.ino = CEPH_INO_ROOT;
>  	req->r_ino1.snap = CEPH_NOSNAP;
> --
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> 
> 
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