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 <[email protected]> Acked-by: Rob Landley <[email protected]> --- 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 39511e3..b72cb01 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, ¤t->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); -- 1.7.3.4 _______________________________________________ Containers mailing list [email protected] https://lists.linux-foundation.org/mailman/listinfo/containers _______________________________________________ Devel mailing list [email protected] https://openvz.org/mailman/listinfo/devel
