Re: [TUHS] VFS prior to 1984

On Mon, Jun 29, 2020 at 04:53:50PM +0200, Paul Ruizendaal wrote: They are two different classes, similar, but not the same. It's really 4 classes, vfs, vnode for FS and block/char for devices. This is from SunOS 4.1.1 that I happened to have an install image sitting around. Took me forever to find the device definitions, I resorted to find . -type f -name '*.h' -print | xargs grep strategy It's in include/sys/conf.h because, well, that's obvious, right? struct vfsops { int (*vfs_mount)(); /* mount file system */ int (*vfs_unmount)(); /* unmount file system */ int (*vfs_root)(); /* get root vnode */ int (*vfs_statfs)(); /* get fs statistics */ int (*vfs_sync)(); /* flush fs buffers */ int (*vfs_vget)(); /* get vnode from fid */ int (*vfs_mountroot)(); /* mount the root filesystem */ int (*vfs_swapvp)(); /* return vnode for swap */ }; struct vnodeops { int (*vn_open)(); int (*vn_close)(); int (*vn_rdwr)(); int (*vn_ioctl)(); int (*vn_select)(); int (*vn_getattr)(); int (*vn_setattr)(); int (*vn_access)(); int (*vn_lookup)(); int (*vn_create)(); int (*vn_remove)(); int (*vn_link)(); int (*vn_rename)(); int (*vn_mkdir)(); int (*vn_rmdir)(); int (*vn_readdir)(); int (*vn_symlink)(); int (*vn_readlink)(); int (*vn_fsync)(); int (*vn_inactive)(); int (*vn_lockctl)(); int (*vn_fid)(); int (*vn_getpage)(); int (*vn_putpage)(); int (*vn_map)(); int (*vn_dump)(); int (*vn_cmp)(); int (*vn_realvp)(); int (*vn_cntl)(); }; /* two different device classes, block and char */ struct bdevsw { int (*d_open)(); int (*d_close)(); int (*d_strategy)(); int (*d_dump)(); int (*d_psize)(); int d_flags; }; struct cdevsw { int (*d_open)(); int (*d_close)(); int (*d_read)(); int (*d_write)(); int (*d_ioctl)(); int (*d_reset)(); int (*d_select)(); int (*d_mmap)(); struct streamtab *d_str; int (*d_segmap)(); }; -- --- Larry McVoy lm at mcvoy.com http://www.mcvoy.com/lm