4.8.2 FiST Declarations

The FiST declarations section contains keywords and other definitions that change the overall behavior of the produced code. They are listed in Table tab-fist-decl.

 

Table: FiST Declaration Keywords

Keyword	Possible	Default	Comments
Values	Value
%fstype	stateless incore persistent	incore	Defines the type of file system to be generated, as described in Section sec-fist-type. If the persistent file system type is chosen, an implicit additional file system is included to the number of interposers. The latter has a special index $0.
%interface	vnode, nfs	vnode	Defines the default interface to generate code for. Can also be defined or overriden by a command line option to the translator.
%interposers	integer	1	Defines how many file systems will this one directly access. If more than one, then to reference these file systems in order use the FiST variables $1, $2, $3, etc.
%mntopts	struct {...};	NULL	Defines a C structure with types and field names of arguments that need to be passed from the user process that mounts this file system, via the mount(2) system call, to the VFS mount operation. User level mount code and common header files will be generated for these definitions.
%filter	See Section sec-fist-filt	none	Defines FiST filter as described in Section sec-fist-filt

 

If only one interposed file system is defined in the %interposers keyword in the declarations section, then its positional parameter may be omitted. All of the filter declarations described in Section sec-fist-filt-func go in this section.