Re: [PATCH 2/3] NFSv3: use nfs_add_or_obtain() to create and reference inodes

["Benjamin Coddington" <bcodding@xxxxxxxxxx>]

On 13 Sep 2019, at 8:29, Benjamin Coddington wrote:

mm.. not sure what happened to the body here.. maybe I didn't have one.
Should at least have:

Signed-off-by: Benjamin Coddington <bcodding@xxxxxxxxxx>

> ---
>  fs/nfs/nfs3proc.c | 45 ++++++++++++++++++++++++++++++++++++---------
>  1 file changed, 36 insertions(+), 9 deletions(-)
>
> diff --git a/fs/nfs/nfs3proc.c b/fs/nfs/nfs3proc.c
> index a3ad2d46fd42..9eb2f1a503ab 100644
> --- a/fs/nfs/nfs3proc.c
> +++ b/fs/nfs/nfs3proc.c
> @@ -279,15 +279,17 @@ static struct nfs3_createdata 
> *nfs3_alloc_createdata(void)
>  	return data;
>  }
>
> -static int nfs3_do_create(struct inode *dir, struct dentry *dentry, 
> struct nfs3_createdata *data)
> +static struct dentry *
> +nfs3_do_create(struct inode *dir, struct dentry *dentry, struct 
> nfs3_createdata *data)
>  {
>  	int status;
>
>  	status = rpc_call_sync(NFS_CLIENT(dir), &data->msg, 0);
>  	nfs_post_op_update_inode(dir, data->res.dir_attr);
> -	if (status == 0)
> -		status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, 
> NULL);
> -	return status;
> +	if (status != 0)
> +		return ERR_PTR(status);
> +
> +	return nfs_add_or_obtain(dentry, data->res.fh, data->res.fattr, 
> NULL);
>  }
>
>  static void nfs3_free_createdata(struct nfs3_createdata *data)
> @@ -304,6 +306,7 @@ nfs3_proc_create(struct inode *dir, struct dentry 
> *dentry, struct iattr *sattr,
>  {
>  	struct posix_acl *default_acl, *acl;
>  	struct nfs3_createdata *data;
> +	struct dentry *d_alias;
>  	int status = -ENOMEM;
>
>  	dprintk("NFS call  create %pd\n", dentry);
> @@ -330,7 +333,8 @@ nfs3_proc_create(struct inode *dir, struct dentry 
> *dentry, struct iattr *sattr,
>  		goto out;
>
>  	for (;;) {
> -		status = nfs3_do_create(dir, dentry, data);
> +		d_alias = nfs3_do_create(dir, dentry, data);
> +		status = PTR_ERR_OR_ZERO(d_alias);
>
>  		if (status != -ENOTSUPP)
>  			break;
> @@ -355,6 +359,9 @@ nfs3_proc_create(struct inode *dir, struct dentry 
> *dentry, struct iattr *sattr,
>  	if (status != 0)
>  		goto out_release_acls;
>
> +	if (d_alias)
> +		dentry = d_alias;
> +
>  	/* When we created the file with exclusive semantics, make
>  	 * sure we set the attributes afterwards. */
>  	if (data->arg.create.createmode == NFS3_CREATE_EXCLUSIVE) {
> @@ -372,11 +379,13 @@ nfs3_proc_create(struct inode *dir, struct 
> dentry *dentry, struct iattr *sattr,
>  		nfs_post_op_update_inode(d_inode(dentry), data->res.fattr);
>  		dprintk("NFS reply setattr (post-create): %d\n", status);
>  		if (status != 0)
> -			goto out_release_acls;
> +			goto out_dput;
>  	}
>
>  	status = nfs3_proc_setacls(d_inode(dentry), acl, default_acl);
>
> +out_dput:
> +	dput(d_alias);
>  out_release_acls:
>  	posix_acl_release(acl);
>  	posix_acl_release(default_acl);
> @@ -504,6 +513,7 @@ nfs3_proc_symlink(struct inode *dir, struct dentry 
> *dentry, struct page *page,
>  		  unsigned int len, struct iattr *sattr)
>  {
>  	struct nfs3_createdata *data;
> +	struct dentry *d_alias;
>  	int status = -ENOMEM;
>
>  	if (len > NFS3_MAXPATHLEN)
> @@ -522,7 +532,11 @@ nfs3_proc_symlink(struct inode *dir, struct 
> dentry *dentry, struct page *page,
>  	data->arg.symlink.pathlen = len;
>  	data->arg.symlink.sattr = sattr;
>
> -	status = nfs3_do_create(dir, dentry, data);
> +	d_alias = nfs3_do_create(dir, dentry, data);
> +	status = PTR_ERR_OR_ZERO(d_alias);
> +
> +	if (status == 0)
> +		dput(d_alias);
>
>  	nfs3_free_createdata(data);
>  out:
> @@ -535,6 +549,7 @@ nfs3_proc_mkdir(struct inode *dir, struct dentry 
> *dentry, struct iattr *sattr)
>  {
>  	struct posix_acl *default_acl, *acl;
>  	struct nfs3_createdata *data;
> +	struct dentry *d_alias;
>  	int status = -ENOMEM;
>
>  	dprintk("NFS call  mkdir %pd\n", dentry);
> @@ -553,12 +568,18 @@ nfs3_proc_mkdir(struct inode *dir, struct dentry 
> *dentry, struct iattr *sattr)
>  	data->arg.mkdir.len = dentry->d_name.len;
>  	data->arg.mkdir.sattr = sattr;
>
> -	status = nfs3_do_create(dir, dentry, data);
> +	d_alias = nfs3_do_create(dir, dentry, data);
> +	status = PTR_ERR_OR_ZERO(d_alias);
> +
>  	if (status != 0)
>  		goto out_release_acls;
>
> +	if (d_alias)
> +		dentry = d_alias;
> +
>  	status = nfs3_proc_setacls(d_inode(dentry), acl, default_acl);
>
> +	dput(d_alias);
>  out_release_acls:
>  	posix_acl_release(acl);
>  	posix_acl_release(default_acl);
> @@ -660,6 +681,7 @@ nfs3_proc_mknod(struct inode *dir, struct dentry 
> *dentry, struct iattr *sattr,
>  {
>  	struct posix_acl *default_acl, *acl;
>  	struct nfs3_createdata *data;
> +	struct dentry *d_alias;
>  	int status = -ENOMEM;
>
>  	dprintk("NFS call  mknod %pd %u:%u\n", dentry,
> @@ -698,12 +720,17 @@ nfs3_proc_mknod(struct inode *dir, struct dentry 
> *dentry, struct iattr *sattr,
>  		goto out;
>  	}
>
> -	status = nfs3_do_create(dir, dentry, data);
> +	d_alias = nfs3_do_create(dir, dentry, data);
> +	status = PTR_ERR_OR_ZERO(d_alias);
>  	if (status != 0)
>  		goto out_release_acls;
>
> +	if (d_alias)
> +		dentry = d_alias;
> +
>  	status = nfs3_proc_setacls(d_inode(dentry), acl, default_acl);
>
> +	dput(d_alias);
>  out_release_acls:
>  	posix_acl_release(acl);
>  	posix_acl_release(default_acl);
> --
> 2.20.1