/* $NetBSD: cd9660_vfsops.c,v 1.36 1999/02/26 23:44:45 wrstuden Exp $ */ /*- * Copyright (c) 1994 * The Regents of the University of California. All rights reserved. * * This code is derived from software contributed to Berkeley * by Pace Willisson (pace@blitz.com). The Rock Ridge Extension * Support code is derived from software contributed to Berkeley * by Atsushi Murai (amurai@spec.co.jp). * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)cd9660_vfsops.c 8.18 (Berkeley) 5/22/95 */ #if defined(_KERNEL) && !defined(_LKM) #include "opt_compat_netbsd.h" #endif #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include extern struct vnodeopv_desc cd9660_vnodeop_opv_desc; extern struct vnodeopv_desc cd9660_specop_opv_desc; extern struct vnodeopv_desc cd9660_fifoop_opv_desc; struct vnodeopv_desc *cd9660_vnodeopv_descs[] = { &cd9660_vnodeop_opv_desc, &cd9660_specop_opv_desc, &cd9660_fifoop_opv_desc, NULL, }; struct vfsops cd9660_vfsops = { MOUNT_CD9660, cd9660_mount, cd9660_start, cd9660_unmount, cd9660_root, cd9660_quotactl, cd9660_statfs, cd9660_sync, cd9660_vget, cd9660_fhtovp, cd9660_vptofh, cd9660_init, cd9660_sysctl, cd9660_mountroot, cd9660_check_export, cd9660_vnodeopv_descs, }; /* * Called by vfs_mountroot when iso is going to be mounted as root. * * Name is updated by mount(8) after booting. */ #define ROOTNAME "root_device" static int iso_mountfs __P((struct vnode *devvp, struct mount *mp, struct proc *p, struct iso_args *argp)); int cd9660_mountroot() { struct mount *mp; extern struct vnode *rootvp; struct proc *p = curproc; /* XXX */ int error; struct iso_args args; if (root_device->dv_class != DV_DISK) return (ENODEV); /* * Get vnodes for swapdev and rootdev. */ if (bdevvp(rootdev, &rootvp)) panic("cd9660_mountroot: can't setup rootvp"); if ((error = vfs_rootmountalloc(MOUNT_CD9660, "root_device", &mp)) != 0) return (error); args.flags = ISOFSMNT_ROOT; if ((error = iso_mountfs(rootvp, mp, p, &args)) != 0) { mp->mnt_op->vfs_refcount--; vfs_unbusy(mp); free(mp, M_MOUNT); return (error); } simple_lock(&mountlist_slock); CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); simple_unlock(&mountlist_slock); (void)cd9660_statfs(mp, &mp->mnt_stat, p); vfs_unbusy(mp); return (0); } /* * VFS Operations. * * mount system call */ int cd9660_mount(mp, path, data, ndp, p) struct mount *mp; const char *path; void *data; struct nameidata *ndp; struct proc *p; { struct vnode *devvp; struct iso_args args; size_t size; int error; struct iso_mnt *imp = NULL; error = copyin(data, (caddr_t)&args, sizeof (struct iso_args)); if (error) return (error); if ((mp->mnt_flag & MNT_RDONLY) == 0) return (EROFS); /* * If updating, check whether changing from read-only to * read/write; if there is no device name, that's all we do. */ if (mp->mnt_flag & MNT_UPDATE) { imp = VFSTOISOFS(mp); if (args.fspec == 0) return (vfs_export(mp, &imp->im_export, &args.export)); } /* * Not an update, or updating the name: look up the name * and verify that it refers to a sensible block device. */ NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, args.fspec, p); if ((error = namei(ndp)) != 0) return (error); devvp = ndp->ni_vp; if (devvp->v_type != VBLK) { vrele(devvp); return ENOTBLK; } if (major(devvp->v_rdev) >= nblkdev) { vrele(devvp); return ENXIO; } /* * If mount by non-root, then verify that user has necessary * permissions on the device. */ if (p->p_ucred->cr_uid != 0) { vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); error = VOP_ACCESS(devvp, VREAD, p->p_ucred, p); VOP_UNLOCK(devvp, 0); if (error) { vrele(devvp); return (error); } } if ((mp->mnt_flag & MNT_UPDATE) == 0) error = iso_mountfs(devvp, mp, p, &args); else { if (devvp != imp->im_devvp) error = EINVAL; /* needs translation */ else vrele(devvp); } if (error) { vrele(devvp); return error; } imp = VFSTOISOFS(mp); (void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size); memset(mp->mnt_stat.f_mntonname + size, 0, MNAMELEN - size); (void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, &size); memset(mp->mnt_stat.f_mntfromname + size, 0, MNAMELEN - size); return 0; } /* * Common code for mount and mountroot */ static int iso_mountfs(devvp, mp, p, argp) register struct vnode *devvp; struct mount *mp; struct proc *p; struct iso_args *argp; { register struct iso_mnt *isomp = (struct iso_mnt *)0; struct buf *bp = NULL; dev_t dev = devvp->v_rdev; int error = EINVAL; int needclose = 0; int ronly = (mp->mnt_flag & MNT_RDONLY) != 0; extern struct vnode *rootvp; int iso_bsize; int iso_blknum; struct iso_volume_descriptor *vdp; struct iso_primary_descriptor *pri; struct iso_directory_record *rootp; int logical_block_size; int sess = 0; if (!ronly) return EROFS; /* * Disallow multiple mounts of the same device. * Disallow mounting of a device that is currently in use * (except for root, which might share swap device for miniroot). * Flush out any old buffers remaining from a previous use. */ if ((error = vfs_mountedon(devvp)) != 0) return error; if (vcount(devvp) > 1 && devvp != rootvp) return EBUSY; if ((error = vinvalbuf(devvp, V_SAVE, p->p_ucred, p, 0, 0)) != 0) return (error); error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, p); if (error) return error; needclose = 1; /* This is the "logical sector size". The standard says this * should be 2048 or the physical sector size on the device, * whichever is greater. For now, we'll just use a constant. */ iso_bsize = ISO_DEFAULT_BLOCK_SIZE; error = VOP_IOCTL(devvp, CDIOREADMSADDR, (caddr_t)&sess, 0, FSCRED, p); if (error) sess = 0; /* never mind */ #if 0 else printf("cdfs: detected multi-session at offset %d\n", sess); #endif for (iso_blknum = 16; iso_blknum < 100; iso_blknum++) { if ((error = bread(devvp, (iso_blknum+sess) * btodb(iso_bsize), iso_bsize, NOCRED, &bp)) != 0) goto out; vdp = (struct iso_volume_descriptor *)bp->b_data; if (memcmp(vdp->id, ISO_STANDARD_ID, sizeof(vdp->id)) != 0) { error = EINVAL; goto out; } if (isonum_711 (vdp->type) == ISO_VD_END) { error = EINVAL; goto out; } if (isonum_711 (vdp->type) == ISO_VD_PRIMARY) break; brelse(bp); } if (isonum_711 (vdp->type) != ISO_VD_PRIMARY) { error = EINVAL; 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) { error = EINVAL; goto out; } rootp = (struct iso_directory_record *)pri->root_directory_record; isomp = malloc(sizeof *isomp, M_ISOFSMNT, M_WAITOK); memset((caddr_t)isomp, 0, sizeof *isomp); isomp->logical_block_size = logical_block_size; isomp->volume_space_size = isonum_733 (pri->volume_space_size); memcpy(isomp->root, rootp, sizeof(isomp->root)); isomp->root_extent = isonum_733 (rootp->extent); isomp->root_size = isonum_733 (rootp->size); isomp->im_bmask = logical_block_size - 1; isomp->im_bshift = 0; while ((1 << isomp->im_bshift) < isomp->logical_block_size) isomp->im_bshift++; bp->b_flags |= B_AGE; brelse(bp); bp = NULL; mp->mnt_data = (qaddr_t)isomp; mp->mnt_stat.f_fsid.val[0] = (long)dev; mp->mnt_stat.f_fsid.val[1] = makefstype(MOUNT_CD9660); mp->mnt_maxsymlinklen = 0; mp->mnt_flag |= MNT_LOCAL; isomp->im_mountp = mp; isomp->im_dev = dev; isomp->im_devvp = devvp; devvp->v_specflags |= SI_MOUNTEDON; /* Check the Rock Ridge Extention support */ if (!(argp->flags & ISOFSMNT_NORRIP)) { if ((error = bread(isomp->im_devvp, (isomp->root_extent + isonum_711(rootp->ext_attr_length)) << (isomp->im_bshift - DEV_BSHIFT), isomp->logical_block_size, NOCRED, &bp)) != 0) goto out; rootp = (struct iso_directory_record *)bp->b_data; if ((isomp->rr_skip = cd9660_rrip_offset(rootp,isomp)) < 0) { argp->flags |= ISOFSMNT_NORRIP; } else { argp->flags &= ~ISOFSMNT_GENS; } /* * The contents are valid, * but they will get reread as part of another vnode, so... */ bp->b_flags |= B_AGE; brelse(bp); bp = NULL; } isomp->im_flags = argp->flags&(ISOFSMNT_NORRIP|ISOFSMNT_GENS|ISOFSMNT_EXTATT); switch (isomp->im_flags&(ISOFSMNT_NORRIP|ISOFSMNT_GENS)) { default: isomp->iso_ftype = ISO_FTYPE_DEFAULT; break; case ISOFSMNT_GENS|ISOFSMNT_NORRIP: isomp->iso_ftype = ISO_FTYPE_9660; break; case 0: isomp->iso_ftype = ISO_FTYPE_RRIP; break; } return 0; out: if (bp) brelse(bp); if (needclose) (void)VOP_CLOSE(devvp, ronly ? FREAD : FREAD|FWRITE, NOCRED, p); if (isomp) { free((caddr_t)isomp, M_ISOFSMNT); mp->mnt_data = (qaddr_t)0; } return error; } /* * Make a filesystem operational. * Nothing to do at the moment. */ /* ARGSUSED */ int cd9660_start(mp, flags, p) struct mount *mp; int flags; struct proc *p; { return 0; } /* * unmount system call */ int cd9660_unmount(mp, mntflags, p) struct mount *mp; int mntflags; struct proc *p; { register struct iso_mnt *isomp; int error, flags = 0; if (mntflags & MNT_FORCE) flags |= FORCECLOSE; #if 0 mntflushbuf(mp, 0); if (mntinvalbuf(mp)) return EBUSY; #endif if ((error = vflush(mp, NULLVP, flags)) != 0) return (error); isomp = VFSTOISOFS(mp); #ifdef ISODEVMAP if (isomp->iso_ftype == ISO_FTYPE_RRIP) iso_dunmap(isomp->im_dev); #endif isomp->im_devvp->v_specflags &= ~SI_MOUNTEDON; error = VOP_CLOSE(isomp->im_devvp, FREAD, NOCRED, p); vrele(isomp->im_devvp); free((caddr_t)isomp, M_ISOFSMNT); mp->mnt_data = (qaddr_t)0; mp->mnt_flag &= ~MNT_LOCAL; return (error); } /* * Return root of a filesystem */ int cd9660_root(mp, vpp) struct mount *mp; struct vnode **vpp; { struct iso_mnt *imp = VFSTOISOFS(mp); struct iso_directory_record *dp = (struct iso_directory_record *)imp->root; ino_t ino = isodirino(dp, imp); /* * With RRIP we must use the `.' entry of the root directory. * Simply tell vget, that it's a relocated directory. */ return (cd9660_vget_internal(mp, ino, vpp, imp->iso_ftype == ISO_FTYPE_RRIP, dp)); } /* * Do operations associated with quotas, not supported */ /* ARGSUSED */ int cd9660_quotactl(mp, cmd, uid, arg, p) struct mount *mp; int cmd; uid_t uid; caddr_t arg; struct proc *p; { return (EOPNOTSUPP); } /* * Get file system statistics. */ int cd9660_statfs(mp, sbp, p) struct mount *mp; register struct statfs *sbp; struct proc *p; { register struct iso_mnt *isomp; isomp = VFSTOISOFS(mp); #ifdef COMPAT_09 sbp->f_type = 5; #else sbp->f_type = 0; #endif sbp->f_bsize = isomp->logical_block_size; sbp->f_iosize = sbp->f_bsize; /* XXX */ sbp->f_blocks = isomp->volume_space_size; sbp->f_bfree = 0; /* total free blocks */ sbp->f_bavail = 0; /* blocks free for non superuser */ sbp->f_files = 0; /* total files */ sbp->f_ffree = 0; /* free file nodes */ if (sbp != &mp->mnt_stat) { memcpy(sbp->f_mntonname, mp->mnt_stat.f_mntonname, MNAMELEN); memcpy(sbp->f_mntfromname, mp->mnt_stat.f_mntfromname, MNAMELEN); } strncpy(sbp->f_fstypename, mp->mnt_op->vfs_name, MFSNAMELEN); /* Use the first spare for flags: */ sbp->f_spare[0] = isomp->im_flags; return 0; } /* ARGSUSED */ int cd9660_sync(mp, waitfor, cred, p) struct mount *mp; int waitfor; struct ucred *cred; struct proc *p; { return (0); } /* * File handle to vnode * * Have to be really careful about stale file handles: * - check that the inode number is in range * - call iget() to get the locked inode * - check for an unallocated inode (i_mode == 0) * - check that the generation number matches */ struct ifid { ushort ifid_len; ushort ifid_pad; int ifid_ino; long ifid_start; }; /* ARGSUSED */ int cd9660_fhtovp(mp, fhp, vpp) register struct mount *mp; struct fid *fhp; struct vnode **vpp; { struct ifid *ifhp = (struct ifid *)fhp; register struct iso_node *ip; struct vnode *nvp; int error; #ifdef ISOFS_DBG printf("fhtovp: ino %d, start %ld\n", ifhp->ifid_ino, ifhp->ifid_start); #endif if ((error = VFS_VGET(mp, ifhp->ifid_ino, &nvp)) != 0) { *vpp = NULLVP; return (error); } ip = VTOI(nvp); if (ip->inode.iso_mode == 0) { vput(nvp); *vpp = NULLVP; return (ESTALE); } *vpp = nvp; return (0); } /* ARGSUSED */ int cd9660_check_export(mp, nam, exflagsp, credanonp) register struct mount *mp; struct mbuf *nam; int *exflagsp; struct ucred **credanonp; { register struct netcred *np; register struct iso_mnt *imp = VFSTOISOFS(mp); #ifdef ISOFS_DBG printf("check_export: ino %d, start %ld\n", ifhp->ifid_ino, ifhp->ifid_start); #endif /* * Get the export permission structure for this tuple. */ np = vfs_export_lookup(mp, &imp->im_export, nam); if (np == NULL) return (EACCES); *exflagsp = np->netc_exflags; *credanonp = &np->netc_anon; return (0); } int cd9660_vget(mp, ino, vpp) struct mount *mp; ino_t ino; struct vnode **vpp; { /* * XXXX * It would be nice if we didn't always set the `relocated' flag * and force the extra read, but I don't want to think about fixing * that right now. */ return (cd9660_vget_internal(mp, ino, vpp, #if 0 VFSTOISOFS(mp)->iso_ftype == ISO_FTYPE_RRIP, #else 0, #endif NULL)); } int cd9660_vget_internal(mp, ino, vpp, relocated, isodir) struct mount *mp; ino_t ino; struct vnode **vpp; int relocated; struct iso_directory_record *isodir; { register struct iso_mnt *imp; struct iso_node *ip; struct buf *bp; struct vnode *vp, *nvp; dev_t dev; int error; imp = VFSTOISOFS(mp); dev = imp->im_dev; if ((*vpp = cd9660_ihashget(dev, ino)) != NULLVP) return (0); /* Allocate a new vnode/iso_node. */ if ((error = getnewvnode(VT_ISOFS, mp, cd9660_vnodeop_p, &vp)) != 0) { *vpp = NULLVP; return (error); } ip = pool_get(&cd9660_node_pool, PR_WAITOK); memset((caddr_t)ip, 0, sizeof(struct iso_node)); lockinit(&ip->i_lock, PINOD, "isonode", 0, 0); vp->v_data = ip; ip->i_vnode = vp; ip->i_dev = dev; ip->i_number = ino; /* * Put it onto its hash chain and lock it so that other requests for * this inode will block if they arrive while we are sleeping waiting * for old data structures to be purged or for the contents of the * disk portion of this inode to be read. */ cd9660_ihashins(ip); if (isodir == 0) { int lbn, off; lbn = lblkno(imp, ino); if (lbn >= imp->volume_space_size) { vput(vp); printf("fhtovp: lbn exceed volume space %d\n", lbn); return (ESTALE); } off = blkoff(imp, ino); if (off + ISO_DIRECTORY_RECORD_SIZE > imp->logical_block_size) { vput(vp); printf("fhtovp: crosses block boundary %d\n", off + ISO_DIRECTORY_RECORD_SIZE); return (ESTALE); } error = bread(imp->im_devvp, lbn << (imp->im_bshift - DEV_BSHIFT), imp->logical_block_size, NOCRED, &bp); if (error) { vput(vp); brelse(bp); printf("fhtovp: bread error %d\n",error); return (error); } isodir = (struct iso_directory_record *)(bp->b_data + off); if (off + isonum_711(isodir->length) > imp->logical_block_size) { vput(vp); if (bp != 0) brelse(bp); printf("fhtovp: directory crosses block boundary %d[off=%d/len=%d]\n", off +isonum_711(isodir->length), off, isonum_711(isodir->length)); return (ESTALE); } #if 0 if (isonum_733(isodir->extent) + isonum_711(isodir->ext_attr_length) != ifhp->ifid_start) { if (bp != 0) brelse(bp); printf("fhtovp: file start miss %d vs %d\n", isonum_733(isodir->extent) + isonum_711(isodir->ext_attr_length), ifhp->ifid_start); return (ESTALE); } #endif } else bp = 0; ip->i_mnt = imp; ip->i_devvp = imp->im_devvp; VREF(ip->i_devvp); if (relocated) { /* * On relocated directories we must * read the `.' entry out of a dir. */ ip->iso_start = ino >> imp->im_bshift; if (bp != 0) brelse(bp); if ((error = VOP_BLKATOFF(vp, (off_t)0, NULL, &bp)) != 0) { vput(vp); return (error); } isodir = (struct iso_directory_record *)bp->b_data; } ip->iso_extent = isonum_733(isodir->extent); ip->i_size = isonum_733(isodir->size); ip->iso_start = isonum_711(isodir->ext_attr_length) + ip->iso_extent; /* * Setup time stamp, attribute */ vp->v_type = VNON; switch (imp->iso_ftype) { default: /* ISO_FTYPE_9660 */ { struct buf *bp2; int off; if ((imp->im_flags & ISOFSMNT_EXTATT) && (off = isonum_711(isodir->ext_attr_length))) VOP_BLKATOFF(vp, (off_t)-(off << imp->im_bshift), NULL, &bp2); else bp2 = NULL; cd9660_defattr(isodir, ip, bp2); cd9660_deftstamp(isodir, ip, bp2); if (bp2) brelse(bp2); break; } case ISO_FTYPE_RRIP: cd9660_rrip_analyze(isodir, ip, imp); break; } if (bp != 0) brelse(bp); /* * Initialize the associated vnode */ switch (vp->v_type = IFTOVT(ip->inode.iso_mode)) { case VFIFO: vp->v_op = cd9660_fifoop_p; break; case VCHR: case VBLK: /* * if device, look at device number table for translation */ #ifdef ISODEVMAP if (dp = iso_dmap(dev, ino, 0)) ip->inode.iso_rdev = dp->d_dev; #endif vp->v_op = cd9660_specop_p; if ((nvp = checkalias(vp, ip->inode.iso_rdev, mp)) != NULL) { /* * Discard unneeded vnode, but save its iso_node. * Note that the lock is carried over in the iso_node * to the replacement vnode. */ nvp->v_data = vp->v_data; vp->v_data = NULL; vp->v_op = spec_vnodeop_p; vrele(vp); vgone(vp); /* * Reinitialize aliased inode. */ vp = nvp; ip->i_vnode = vp; } break; case VLNK: case VNON: case VSOCK: case VDIR: case VBAD: case VREG: break; } if (ip->iso_extent == imp->root_extent) vp->v_flag |= VROOT; /* * XXX need generation number? */ *vpp = vp; return (0); } /* * Vnode pointer to File handle */ /* ARGSUSED */ int cd9660_vptofh(vp, fhp) struct vnode *vp; struct fid *fhp; { register struct iso_node *ip = VTOI(vp); register struct ifid *ifhp; ifhp = (struct ifid *)fhp; ifhp->ifid_len = sizeof(struct ifid); ifhp->ifid_ino = ip->i_number; ifhp->ifid_start = ip->iso_start; #ifdef ISOFS_DBG printf("vptofh: ino %d, start %ld\n", ifhp->ifid_ino,ifhp->ifid_start); #endif return 0; } int cd9660_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p) int *name; u_int namelen; void *oldp; size_t *oldlenp; void *newp; size_t newlen; struct proc *p; { return (EOPNOTSUPP); }