Building a VFS entity
KasperskyOS Community Edition does not provide a ready-to-use image for an entity containing the VFS component. The solution developer can independently build one or more entities that each include the specific VFS functionality necessary for the solution.
Please also refer to the multi_vfs_dhcpcd, multi_vfs_dns_client and multi_vfs_ntpd examples provided in KasperskyOS Community Edition.
Building a network VFS
To build a "network" VFS entity containing a network driver, the file containing the main() function must be linked to the vfs_server, vfs_net and dnet_implementation libraries:
CMakeLists.txt (fragment)
target_link_libraries (Net1Vfs ${vfs_SERVER_LIB}
${vfs_NET_LIB}
${dnet_IMPLEMENTATION_LIB})
set_target_properties (Net1Vfs PROPERTIES ${blkdev_ENTITY}_REPLACEMENT "")
Using a "network" VFS entity linked to a network driver
To use a network driver via IPC (as a separate entity), the dnet_client library must be used instead of the dnet_implementation library:
CMakeLists.txt (fragment)
target_link_libraries (Net2Vfs ${vfs_SERVER_LIB}
${vfs_NET_LIB}
${dnet_CLIENT_LIB})
set_target_properties (Net2Vfs PROPERTIES ${blkdev_ENTITY}_REPLACEMENT "")
Using a "network" VFS entity and a network driver as a separate entity
File operations are used by some functions, including printing to stdout. For these functions to work correctly, the vfs_implementation library must be added instead of vfs_net during the build.
Building a file VFS
To build a "file" VFS entity, the file containing the main() function must be linked to the vfs_server and vfs_fs libraries and to the libraries for implementing file systems:
CMakeLists.txt (fragment)
target_link_libraries (VfsFs
${vfs_SERVER_LIB}
${LWEXT4_LIB}
${vfs_FS_LIB})
set_target_properties (VfsFs PROPERTIES ${blkdev_ENTITY}_REPLACEMENT ${ramdisk_ENTITY})
In this example, the VFS entity is prepared to connect to the ramdisk driver entity.
A block device driver cannot be linked to VFS and is always used via IPC:
Using a "file" VFS entity and a driver as a separate entity
If necessary, you can build a VFS entity containing the network stack and the file systems. To do so, use the vfs_server, vfs_implementation, and dnet_implementation libraries (or dnet_client), and the file system implementation libraries.