Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!mnetor!seismo!ll-xn!ames!necntc!ncoast!allbery From: mouse@mcgill-vision.UUCP (der Mouse ) Newsgroups: comp.sources.misc Subject: filedisk: make a file into a filesystem (2 of 2) (BSD4.3) Message-ID: <2742@ncoast.UUCP> Date: Mon, 29-Jun-87 20:10:12 EDT Article-I.D.: ncoast.2742 Posted: Mon Jun 29 20:10:12 1987 Date-Received: Wed, 1-Jul-87 03:44:37 EDT Sender: allbery@ncoast.UUCP Lines: 392 Approved: allbery@ncoast.UUCP X-Archive: comp.sources.misc/8706/9 This is part 2 of 2. Read the README (in part 1) to see what it's part 2 of. I had to split up even this tiny thing because someone, either sun or seismo (not sure which), has a 10000 byte limit on mail (yes, only ten thousand bytes). der Mouse (mouse@mcgill-vision.uucp) #! /bin/sh # # Shar: Shell Archiver # # This archive created Sun Jun 28 17:50:43 1987 # Run this through sh to create: # filedisk.c # fdconn.c # fddisc.c echo x - filedisk.c \(4378 characters\) sed 's/^X//' > filedisk.c << \SHAR_EOF X/* X * Filesystem-in-a-file pseudo-disk driver. X */ X X#include "filedisk.h" X X#if NFILEDISK > 0 X X#include "../h/param.h" X#include "../h/systm.h" X#include "../h/ioctl.h" X#include "../h/buf.h" X#include "../h/conf.h" X#include "../h/dir.h" X#include "../h/file.h" X#include "../h/inode.h" X#include "../h/namei.h" X#include "../h/user.h" X#include "../h/proc.h" X#include "../h/uio.h" X#include "../h/mount.h" X#include "../h/fs.h" X#include "../h/kernel.h" X Xstatic struct fdinfo { X int alive; X int unit; X struct inode *ino; X int nblocks; } info[NFILEDISK]; Xstatic int didinit = 0; X X#define OKUNIT(u) (((u)>=0)&&((u) 0, (u)mounts can't happen */ X for (mp= &mount[0];mp<&mount[NMOUNT];mp++) X { if (mp->m_bufp != 0) X { dev = mp->m_dev; X if ( (bdevsw[major(dev)].d_strategy == filediskstrategy) && X (minor(dev) == unit) ) X { splx(s); X return(1); X } X } X } X splx(s); X return(0); X} X Xfilediskioctl(dev,cmd,data,flag) Xdev_t dev; Xint cmd; Xcaddr_t data; Xint flag; X{ X int unit; X int rv; X struct inode *ip; X register struct nameidata *ndp; X X#ifdef lint X flag = flag; X#endif X unit = minor(dev); X rv = EIO; X switch (cmd) X { case LIOC_FSF_SET: X if (! suser()) X { rv = EPERM; X break; X } X if (info[unit].alive) X { rv = EBUSY; X break; X } X ndp = &u.u_nd; X ndp->ni_segflg = UIO_USERSPACE; X ndp->ni_dirp = *(char **)data; X ndp->ni_nameiop = LOOKUP | FOLLOW; X ip = namei(ndp); X if (ip == 0) X { rv = u.u_error; X break; X } X if ((ip->i_mode&IFMT) != IFREG) X { iput(ip); X rv = EINVAL; X break; X } X info[unit].ino = ip; X info[unit].nblocks = btodb(ip->i_size); X info[unit].alive = 1; X iunlock(ip); X rv = 0; X break; X case LIOC_FSF_CLEAR: X if (! suser()) X { rv = EPERM; X break; X } X if (unit_mounted(unit)) X { rv = EBUSY; X break; X } X if (info[unit].alive) X { info[unit].alive = 0; X irele(info[unit].ino); X rv = 0; X } X else X { rv = ENXIO; X } X break; X } X return(rv); X} X Xfilediskdump() X{ X return(ENXIO); X} X Xfiledisksize(dev) Xdev_t dev; X{ X int unit; X X unit = minor(dev); X if ((unit < 0) || (unit >= NFILEDISK) || !info[unit].alive) X { return(-1); X } X return(info[unit].nblocks); X} X Xfilediskreset(uban) Xint uban; X{ X printf("filedisk reset on %d?\n",uban); X} X Xstatic int buf_ok(bp) Xstruct buf *bp; X{ X int unit; X int nblk; X X#define FAIL() return((bp->b_flags|=B_ERROR),(iodone(bp)),0) X unit = minor(bp->b_dev); X if (bp->b_bcount & (DEV_BSIZE-1)) X { FAIL(); X } X nblk = btodb(bp->b_bcount); X if (! info[unit].alive) X { FAIL(); X } X if ( (bp->b_blkno < 0) || X (bp->b_blkno+nblk > info[unit].nblocks) ) X { FAIL(); X } X if (! info[unit].ino) X { FAIL(); X } X return(1); X#undef FAIL X} X Xstatic doionow(bp) Xstruct buf *bp; X{ X int unit = minor(bp->b_dev); X struct inode *ip = info[unit].ino; X X ilock(ip); X if (bp->b_flags & B_READ) X { bp->b_error = rdwri( UIO_READ, X ip, X bp->b_un.b_addr, X bp->b_bcount, X dbtob(bp->b_blkno), X 1, X &bp->b_resid ); X if (bp->b_error) X { bp->b_flags |= B_ERROR; X } X } X else X { bp->b_error = rdwri( UIO_WRITE, X ip, X bp->b_un.b_addr, X bp->b_bcount, X dbtob(bp->b_blkno), X 1, X &bp->b_resid ); X if (bp->b_error) X { bp->b_flags |= B_ERROR; X } X } X iunlock(ip); X iodone(bp); X} X X#endif SHAR_EOF if test 4378 -ne "`wc -c filedisk.c`" then echo shar: error transmitting filedisk.c \(should have been 4378 characters\) fi echo x - fdconn.c \(664 characters\) sed 's/^X//' > fdconn.c << \SHAR_EOF X#include X#include X#include X Xchar **argvec; X X/* usage: fdconn */ X Xchar dname[64]; Xint dfd; X Xmain(ac,av) Xint ac; Xchar **av; X{ X int unit; X X argvec = av; X if (ac != 3) X { fprintf(stderr,"Usage: %s unit file\n",argvec[0]); X exit(1); X } X unit = atoi(av[1]); X sprintf(dname,"/dev/rfiledisk%d",unit); X dfd = open(dname,O_RDWR,0); X if (dfd < 0) X { fprintf(stderr,"%s: cannot open %s: ",argvec[0],dname); X perror((char *)0); X exit(1); X } X if (ioctl(dfd,LIOC_FSF_SET,&av[2]) < 0) X { fprintf(stderr,"%s: cannot connect %s to %s: ",argvec[0],dname,av[2]); X perror((char *)0); X exit(1); X } X exit(0); X} SHAR_EOF if test 664 -ne "`wc -c fdconn.c`" then echo shar: error transmitting fdconn.c \(should have been 664 characters\) fi echo x - fddisc.c \(636 characters\) sed 's/^X//' > fddisc.c << \SHAR_EOF X#include X#include X#include X Xchar **argvec; X X/* usage: fddisc */ X Xchar dname[64]; Xint dfd; X Xmain(ac,av) Xint ac; Xchar **av; X{ X int unit; X X argvec = av; X if (ac != 2) X { fprintf(stderr,"Usage: %s unit\n",argvec[0]); X exit(1); X } X unit = atoi(av[1]); X sprintf(dname,"/dev/rfiledisk%d",unit); X dfd = open(dname,O_RDWR,0); X if (dfd < 0) X { fprintf(stderr,"%s: cannot open %s: ",argvec[0],dname); X perror((char *)0); X exit(1); X } X if (ioctl(dfd,LIOC_FSF_CLEAR,0) < 0) X { fprintf(stderr,"%s: cannot disconnect %s: ",argvec[0],dname); X perror((char *)0); X exit(1); X } X exit(0); X} SHAR_EOF if test 636 -ne "`wc -c fddisc.c`" then echo shar: error transmitting fddisc.c \(should have been 636 characters\) fi exit 0 # end of shell archive