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The Remote File System (RFS) was a distributed file system developed by AT&T in the 1980s. It was first delivered with UNIX System V Release 3 (SVR3).
Compared to NFS it was superior on purely logical grounds,[citation needed] preserving UNIX file system semantics across the network. Unlike NFS (before version 4), the RFS server maintains state to keep track of how many times a file has been opened, if any process has locked the file, etc. RFS was a product from Bell Laboratories. People involved in the creation of RFS: Andrew P. Rifkin, Michael P. Forbes, Richard L. Hamilton, Michael Sabrio, Suryakanta Shah, and Kang Yueh.
Features
- Provides complete UNIX/POSIX file semantics. (File locking, etc)
- Allows mounting of devices across the network (e.g /dev/cdrom can be accessed remotely)
- Transparent access to files. Users needn't know where a file is located.
Remote system call interface
- ACCESS
- SYSACCT
- CHDIR Change directory
- CHMOD Change file mode
- CHOWN Change file owner
- CHROOT
- CLOSE Close a file
- CREAT Create a file
- EXEC Execute a file
- EXECE Execute a file with an environment
- FCNTL
- FSTAT Stat a file using a file descriptor
- FSTATFS Stat a file system using a file descriptor
- IOCTL
- LINK First half of link() operation
- LINK1 Second half of link() operation
- MKNOD Make block or character special file
- OPEN Open a file
- READ Read from a file
- SEEK Seek on a file
- STAT Stat a file using pathname
- STATFS Stat a file system using pathname
- UNLINK
- UTIME
- UTSSYS Return information about a mounted files
- WRITE
- GETDENTS Read directory entries in a file system
- MKDIR
- RMDIR
- SRMOUNT Server side of remote mount
- SRUMOUNT Server side of remote unmount
- COREDUMP Dump core request
- WRITEI Internal form of write system call
- READI Internal form of read system call
- RSIGNAL Sendremote signal
- SYNCTIME Synchronize time between machines
- IPUT Free a remote inode
- IUPDATE Update a remote inode
- UPDATE Write modified buffers back to disk.
See also
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