diff options
| -rw-r--r-- | sys/isofs/cd9660/cd9660_vfsops.c | 84 |
1 files changed, 83 insertions, 1 deletions
diff --git a/sys/isofs/cd9660/cd9660_vfsops.c b/sys/isofs/cd9660/cd9660_vfsops.c index dd8988fa99c..0a6d9902231 100644 --- a/sys/isofs/cd9660/cd9660_vfsops.c +++ b/sys/isofs/cd9660/cd9660_vfsops.c @@ -1,4 +1,4 @@ -/* $OpenBSD: cd9660_vfsops.c,v 1.2 1996/02/29 10:12:26 niklas Exp $ */ +/* $OpenBSD: cd9660_vfsops.c,v 1.3 1996/12/05 13:08:11 deraadt Exp $ */ /* $NetBSD: cd9660_vfsops.c,v 1.20 1996/02/09 21:32:08 christos Exp $ */ /*- @@ -57,6 +57,8 @@ #include <sys/malloc.h> #include <sys/stat.h> +#define b_cylin b_resid + #include <isofs/cd9660/iso.h> #include <isofs/cd9660/iso_rrip.h> #include <isofs/cd9660/cd9660_node.h> @@ -85,6 +87,8 @@ struct vfsops cd9660_vfsops = { static int iso_mountfs __P((struct vnode *devvp, struct mount *mp, struct proc *p, struct iso_args *argp)); +int iso_disklabelspoof __P((dev_t dev, void (*strat) __P((struct buf *)), + struct disklabel *lp)); int cd9660_mountroot() @@ -374,6 +378,84 @@ out: } /* + * Test to see if the device is an ISOFS filesystem. + */ +int +iso_disklabelspoof(dev, strat, lp) + dev_t dev; + void (*strat) __P((struct buf *)); + register struct disklabel *lp; +{ + struct buf *bp = NULL; + struct iso_volume_descriptor *vdp; + struct iso_primary_descriptor *pri; + int logical_block_size; + int iso_blknum; + + bp = geteblk(ISO_DEFAULT_BLOCK_SIZE); + bp->b_dev = dev; + + for (iso_blknum = 16; iso_blknum < 100; iso_blknum++) { + bp->b_blkno = iso_blknum * btodb(ISO_DEFAULT_BLOCK_SIZE); + bp->b_bcount = ISO_DEFAULT_BLOCK_SIZE; + bp->b_flags = B_BUSY | B_READ; + bp->b_cylin = bp->b_blkno / lp->d_secpercyl; + + /*printf("d_secsize %d iso_blknum %d b_blkno %d bcount %d\n", + lp->d_secsize, iso_blknum, bp->b_blkno, bp->b_bcount);*/ + + (*strat)(bp); + + if (biowait(bp)) + goto out; + + vdp = (struct iso_volume_descriptor *)bp->b_data; + /*printf("%2x%2x%2x type %2x\n", vdp->id[0], vdp->id[1], + vdp->id[2], isonum_711(vdp->type));*/ + if (bcmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) != 0 || + isonum_711 (vdp->type) == ISO_VD_END) + goto out; + + if (isonum_711 (vdp->type) == ISO_VD_PRIMARY) + break; + } + + if (isonum_711 (vdp->type) != ISO_VD_PRIMARY) + goto out; + + pri = (struct iso_primary_descriptor *)vdp; + logical_block_size = isonum_723 (pri->logical_block_size); + if (logical_block_size < DEV_BSIZE || logical_block_size > MAXBSIZE || + (logical_block_size & (logical_block_size - 1)) != 0) + goto out; + + /* + * build a disklabel for the CD + */ + lp->d_partitions[0].p_offset = 0; + lp->d_partitions[0].p_size = lp->d_secperunit; + lp->d_partitions[0].p_fstype = FS_ISO9660; + lp->d_partitions[RAW_PART].p_offset = 0; + lp->d_partitions[RAW_PART].p_size = lp->d_secperunit; + lp->d_partitions[RAW_PART].p_fstype = FS_ISO9660; + lp->d_npartitions = RAW_PART + 1; + lp->d_bbsize = 8192; /* fake */ + lp->d_sbsize = 64*1024; /* fake */ + + lp->d_magic = DISKMAGIC; + lp->d_magic2 = DISKMAGIC; + lp->d_checksum = dkcksum(lp); + bp->b_flags |= B_INVAL; + brelse(bp); + return (0); + +out: + bp->b_flags |= B_INVAL; + brelse(bp); + return (EINVAL); +} + +/* * Make a filesystem operational. * Nothing to do at the moment. */ |