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    Subject[PATCH v3, RESEND 12/16] sunrpc: introduce get_rpc_pipefs()
    Date
    Get rpc_pipefs mount point by path. If path is NULL, we use first
    rpc_pipefs from mount table visible from current root directory.

    Signed-off-by: Kirill A. Shutemov <kas@openvz.org>
    Reviewed-by: Rob Landley <rlandley@parallels.com>
    ---
    include/linux/sunrpc/rpc_pipe_fs.h | 1 +
    net/sunrpc/rpc_pipe.c | 51 ++++++++++++++++++++++++++++++++++++
    2 files changed, 52 insertions(+), 0 deletions(-)

    diff --git a/include/linux/sunrpc/rpc_pipe_fs.h b/include/linux/sunrpc/rpc_pipe_fs.h
    index f5216f1..4a8830a 100644
    --- a/include/linux/sunrpc/rpc_pipe_fs.h
    +++ b/include/linux/sunrpc/rpc_pipe_fs.h
    @@ -46,6 +46,7 @@ RPC_I(struct inode *inode)

    extern struct vfsmount *init_rpc_pipefs;

    +extern struct vfsmount *get_rpc_pipefs(const char *path);
    extern int rpc_pipefs_add_destroy_cb(struct super_block *sb,
    void (*destroy_cb)(void *data), void *data);

    diff --git a/net/sunrpc/rpc_pipe.c b/net/sunrpc/rpc_pipe.c
    index 58312fa..1261f27 100644
    --- a/net/sunrpc/rpc_pipe.c
    +++ b/net/sunrpc/rpc_pipe.c
    @@ -16,6 +16,9 @@
    #include <linux/namei.h>
    #include <linux/fsnotify.h>
    #include <linux/kernel.h>
    +#include <linux/nsproxy.h>
    +#include <linux/mnt_namespace.h>
    +#include <linux/fs_struct.h>

    #include <asm/ioctls.h>
    #include <linux/fs.h>
    @@ -939,6 +942,54 @@ static const struct super_operations s_ops = {

    #define RPCAUTH_GSSMAGIC 0x67596969

    +static int check_rpc_pipefs(struct vfsmount *mnt, void *arg)
    +{
    + struct vfsmount **rpcmount = arg;
    + struct path path = {
    + .mnt = mnt,
    + .dentry = mnt->mnt_root,
    + };
    +
    + if (!mnt->mnt_sb)
    + return 0;
    + if (mnt->mnt_sb->s_magic != RPCAUTH_GSSMAGIC)
    + return 0;
    +
    + if (!path_is_under(&path, &current->fs->root))
    + return 0;
    +
    + *rpcmount = mntget(mnt);
    + return 1;
    +}
    +
    +struct vfsmount *get_rpc_pipefs(const char *p)
    +{
    + int error;
    + struct vfsmount *rpcmount = ERR_PTR(-EINVAL);
    + struct path path;
    +
    + if (!p) {
    + iterate_mounts(check_rpc_pipefs, &rpcmount,
    + current->nsproxy->mnt_ns->root);
    +
    + if (IS_ERR(rpcmount) && (current->nsproxy->mnt_ns ==
    + init_task.nsproxy->mnt_ns))
    + return mntget(init_rpc_pipefs);
    +
    + return rpcmount;
    + }
    +
    + error = kern_path(p, LOOKUP_FOLLOW | LOOKUP_DIRECTORY, &path);
    + if (error)
    + return ERR_PTR(error);
    +
    + check_rpc_pipefs(path.mnt, &rpcmount);
    + path_put(&path);
    +
    + return rpcmount;
    +}
    +EXPORT_SYMBOL_GPL(get_rpc_pipefs);
    +
    struct destroy_cb {
    struct list_head list;
    void (*callback)(void *data);
    --
    1.7.4


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