fs/nfs/nfs4idmap.c

Source file repositories/reference/linux-study-clean/fs/nfs/nfs4idmap.c

File Facts

System
Linux kernel
Corpus path
fs/nfs/nfs4idmap.c
Extension
.c
Size
20215 bytes
Lines
794
Domain
Core OS
Bucket
VFS And Filesystem Core
Inferred role
Core OS: exported/initcall integration point
Status
integration implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

Dependency Surface

Detected Declarations

Annotated Snippet

struct idmap_legacy_upcalldata {
	struct rpc_pipe_msg pipe_msg;
	struct idmap_msg idmap_msg;
	struct key	*authkey;
	struct idmap *idmap;
};

struct idmap {
	struct rpc_pipe_dir_object idmap_pdo;
	struct rpc_pipe		*idmap_pipe;
	struct idmap_legacy_upcalldata *idmap_upcall_data;
	struct mutex		idmap_mutex;
	struct user_namespace	*user_ns;
};

static struct user_namespace *idmap_userns(const struct idmap *idmap)
{
	if (idmap && idmap->user_ns)
		return idmap->user_ns;
	return &init_user_ns;
}

/**
 * nfs_fattr_init_names - initialise the nfs_fattr owner_name/group_name fields
 * @fattr: fully initialised struct nfs_fattr
 * @owner_name: owner name string cache
 * @group_name: group name string cache
 */
void nfs_fattr_init_names(struct nfs_fattr *fattr,
		struct nfs4_string *owner_name,
		struct nfs4_string *group_name)
{
	fattr->owner_name = owner_name;
	fattr->group_name = group_name;
}

static void nfs_fattr_free_owner_name(struct nfs_fattr *fattr)
{
	fattr->valid &= ~NFS_ATTR_FATTR_OWNER_NAME;
	kfree(fattr->owner_name->data);
}

static void nfs_fattr_free_group_name(struct nfs_fattr *fattr)
{
	fattr->valid &= ~NFS_ATTR_FATTR_GROUP_NAME;
	kfree(fattr->group_name->data);
}

static bool nfs_fattr_map_owner_name(struct nfs_server *server, struct nfs_fattr *fattr)
{
	struct nfs4_string *owner = fattr->owner_name;
	kuid_t uid;

	if (!(fattr->valid & NFS_ATTR_FATTR_OWNER_NAME))
		return false;
	if (nfs_map_name_to_uid(server, owner->data, owner->len, &uid) == 0) {
		fattr->uid = uid;
		fattr->valid |= NFS_ATTR_FATTR_OWNER;
	}
	return true;
}

static bool nfs_fattr_map_group_name(struct nfs_server *server, struct nfs_fattr *fattr)
{
	struct nfs4_string *group = fattr->group_name;
	kgid_t gid;

	if (!(fattr->valid & NFS_ATTR_FATTR_GROUP_NAME))
		return false;
	if (nfs_map_group_to_gid(server, group->data, group->len, &gid) == 0) {
		fattr->gid = gid;
		fattr->valid |= NFS_ATTR_FATTR_GROUP;
	}
	return true;
}

/**
 * nfs_fattr_free_names - free up the NFSv4 owner and group strings
 * @fattr: a fully initialised nfs_fattr structure
 */
void nfs_fattr_free_names(struct nfs_fattr *fattr)
{
	if (fattr->valid & NFS_ATTR_FATTR_OWNER_NAME)
		nfs_fattr_free_owner_name(fattr);
	if (fattr->valid & NFS_ATTR_FATTR_GROUP_NAME)
		nfs_fattr_free_group_name(fattr);
}

/**
 * nfs_fattr_map_and_free_names - map owner/group strings into uid/gid and free

Annotation

Implementation Notes