RUMP_ETFS(3) BSD Library Functions Manual RUMP_ETFS(3)
rump_etfs -- rump host file system interface
rump kernel (librump, -lrump)
rump_pub_etfs_register(const char *key, const char *hostpath, enum rump_etfs_type ftype);
rump_pub_etfs_register_withsize(const char *key, const char *hostpath,
enum rump_etfs_type ftype, uint64_t begin, uint64_t size);
rump_pub_etfs_remove(const char *key);
The rump ExtraTerrestrial File System (rump_etfs) is used to provide access to the host file
system namespace within a rump kernel.
The operation is based on registered key values which each map to a hostpath. A key must be
an absolute path (i.e. begin with ``/''). Multiple leading slashes are collapsed to one
(i.e. ``/key'' is the same as ``//key''). The rest of the path, including slashes, is com-
pared verbatim (i.e. ``/key/path'' does not match ``/key//path'').
The hostpath is interpreted in host system context for the current working directory and can
be either absolute or relative.
The ftype parameter specifies how etfs file will be presented and does not have to match the
host type, although some limitations apply. Possible values are:
RUMP_ETFS_REG regular file.
RUMP_ETFS_BLK block device. This is often used when mapping file system images.
RUMP_ETFS_CHR character device.
RUMP_ETFS_DIR directory. This option is valid only when hostpath is a direc-
tory. The immediate children of the host directory will be acces-
sible inside a rump kernel.
RUMP_ETFS_DIR_SUBDIRS directory. This option is valid only when hostpath is a direc-
tory. This option recursively applies to all subdirectories, and
allows a rump kernel to access an entire directory tree.
The interfaces are:
rump_pub_etfs_register(key, hostpath, ftype)
Map key to a file of type ftype with the contents of hostpath.
rump_pub_etfs_register_withsize(key, hostpath, ftype, begin, size)
Like the above, but map only [begin, begin+size] from hostpath. This is useful when
mapping disk images where only one partition is relevant to the application. If size
is given the special value RUMP_ETFS_SIZE_ENDOFF, the underlying file is mapped from
begin to the end of the file.
Remove etfs mapping for key. This routine may be called only if the file related to
the mapping is not in use.
Map a host image file to a mountable /dev/harddisk path using window offsets from the
pp->p_offset << DEV_BSHIFT, pp->p_size << DEV_BSHIFT);
Make the host kernel module directory hierarchy available within the rump kernel.
rump_etfs first appeared in NetBSD 6.0.
BSD February 3, 2011 BSD