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SubjectRe: [PATCH v3 09/16] sunrpc: introduce rpc_pipefs_add_destroy_cb()
On Fri, Jan 14, 2011 at 03:49:07PM +0200, Kirill A. Shutemov wrote:
> Add facility to do some action on destroying of rpc_pipefs superblock.
>
> Signed-off-by: Kirill A. Shutemov <kas@openvz.org>
> ---
> include/linux/sunrpc/rpc_pipe_fs.h | 3 ++
> net/sunrpc/rpc_pipe.c | 51 ++++++++++++++++++++++++++++++++++-
> 2 files changed, 52 insertions(+), 2 deletions(-)
>
> diff --git a/include/linux/sunrpc/rpc_pipe_fs.h b/include/linux/sunrpc/rpc_pipe_fs.h
> index b09bfa5..f5216f1 100644
> --- a/include/linux/sunrpc/rpc_pipe_fs.h
> +++ b/include/linux/sunrpc/rpc_pipe_fs.h
> @@ -46,6 +46,9 @@ RPC_I(struct inode *inode)
>
> extern struct vfsmount *init_rpc_pipefs;
>
> +extern int rpc_pipefs_add_destroy_cb(struct super_block *sb,
> + void (*destroy_cb)(void *data), void *data);
> +
> extern int rpc_queue_upcall(struct inode *, struct rpc_pipe_msg *);
>
> struct rpc_clnt;
> diff --git a/net/sunrpc/rpc_pipe.c b/net/sunrpc/rpc_pipe.c
> index 484c9a3..39511e3 100644
> --- a/net/sunrpc/rpc_pipe.c
> +++ b/net/sunrpc/rpc_pipe.c
> @@ -939,6 +939,31 @@ static const struct super_operations s_ops = {
>
> #define RPCAUTH_GSSMAGIC 0x67596969
>
> +struct destroy_cb {
> + struct list_head list;
> + void (*callback)(void *data);
> + void *data;
> +};
> +
> +int rpc_pipefs_add_destroy_cb(struct super_block *sb,
> + void (*destroy_cb)(void *data), void *data)
> +{
> + struct destroy_cb *dcb;
> + struct list_head *destroy_cb_list = sb->s_fs_info;
> +
> + dcb = kmalloc(sizeof(*dcb), GFP_KERNEL);
> + if (!dcb)
> + return -ENOMEM;
> +
> + dcb->callback = destroy_cb;
> + dcb->data = data;
> + INIT_LIST_HEAD(&dcb->list);
> + list_add(&dcb->list, destroy_cb_list);
> +
> + return 0;
> +}
> +EXPORT_SYMBOL_GPL(rpc_pipefs_add_destroy_cb);
> +
> /*
> * We have a single directory with 1 node in it.
> */
> @@ -1004,8 +1029,16 @@ rpc_fill_super(struct super_block *sb, void *data, int silent)
> iput(inode);
> return -ENOMEM;
> }
> - if (rpc_populate(root, files, RPCAUTH_lockd, RPCAUTH_RootEOF, NULL))
> + /* List of destroy callbacks */
> + sb->s_fs_info = kmalloc(sizeof(struct list_head), GFP_KERNEL);
> + if (!sb->s_fs_info)
> + return -ENOMEM;
> + INIT_LIST_HEAD((struct list_head*) &sb->s_fs_info);

'&' is by mistake here.

> + if (rpc_populate(root, files, RPCAUTH_lockd, RPCAUTH_RootEOF, NULL)) {
> + kfree(sb->s_fs_info);
> return -ENOMEM;
> + }
> +
> return 0;
> }

--
Kirill A. Shutemov


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