/* $OpenBSD: udf_vfsops.c,v 1.3 2005/05/15 21:26:19 pedro Exp $ */ /* * Copyright (c) 2001, 2002 Scott Long * All rights reserved. * * 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. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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. * * $FreeBSD: src/sys/fs/udf/udf_vfsops.c,v 1.25 2005/01/25 15:52:03 phk Exp $ */ /* * Ported to OpenBSD by Pedro Martelletto in February 2005. */ /* * Ok, here's how it goes. The UDF specs are pretty clear on how each data * structure is made up, but not very clear on how they relate to each other. * Here is the skinny... This demostrates a filesystem with one file in the * root directory. Subdirectories are treated just as normal files, but they * have File Id Descriptors of their children as their file data. As for the * Anchor Volume Descriptor Pointer, it can exist in two of the following three * places: sector 256, sector n (the max sector of the disk), or sector * n - 256. It's a pretty good bet that one will exist at sector 256 though. * One caveat is unclosed CD media. For that, sector 256 cannot be written, * so the Anchor Volume Descriptor Pointer can exist at sector 512 until the * media is closed. * * Sector: * 256: * n: Anchor Volume Descriptor Pointer * n - 256: | * | * |-->Main Volume Descriptor Sequence * | | * | | * | |-->Logical Volume Descriptor * | | * |-->Partition Descriptor | * | | * | | * |-->Fileset Descriptor * | * | * |-->Root Dir File Entry * | * | * |-->File data: * File Id Descriptor * | * | * |-->File Entry * | * | * |-->File data */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include struct pool udf_trans_pool; struct pool udf_node_pool; struct pool udf_ds_pool; int udf_find_partmaps(struct udf_mnt *, struct logvol_desc *); const struct vfsops udf_vfsops = { .vfs_fhtovp = udf_fhtovp, .vfs_init = udf_init, .vfs_mount = udf_mount, .vfs_start = udf_start, .vfs_root = udf_root, .vfs_quotactl = udf_quotactl, .vfs_statfs = udf_statfs, .vfs_sync = udf_sync, .vfs_unmount = udf_unmount, .vfs_vget = udf_vget, .vfs_vptofh = udf_vptofh, .vfs_sysctl = udf_sysctl, .vfs_checkexp = udf_checkexp, }; int udf_mountfs(struct vnode *, struct mount *, struct proc *); int udf_init(struct vfsconf *foo) { pool_init(&udf_trans_pool, MAXNAMLEN * sizeof(unicode_t), 0, 0, 0, "udftrpl", &pool_allocator_nointr); pool_init(&udf_node_pool, sizeof(struct udf_node), 0, 0, 0, "udfndpl", &pool_allocator_nointr); pool_init(&udf_ds_pool, sizeof(struct udf_dirstream), 0, 0, 0, "udfdspl", &pool_allocator_nointr); return (0); } int udf_start(struct mount *mp, int flags, struct proc *p) { return (0); } int udf_mount(struct mount *mp, const char *path, void *data, struct nameidata *ndp, struct proc *p) { struct vnode *devvp; /* vnode of the mount device */ struct udf_args args; size_t len; int error; if ((mp->mnt_flag & MNT_RDONLY) == 0) { mp->mnt_flag |= MNT_RDONLY; printf("udf_mount: enforcing read-only mode\n"); } /* * No root filesystem support. Probably not a big deal, since the * bootloader doesn't understand UDF. */ if (mp->mnt_flag & MNT_ROOTFS) return (EOPNOTSUPP); error = copyin(data, &args, sizeof(struct udf_args)); if (error) return (error); if (args.fspec == NULL) return (EINVAL); NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, args.fspec, p); if ((error = namei(ndp))) 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); } /* Check the access rights on the mount device */ if (p->p_ucred->cr_uid) { vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, p); error = VOP_ACCESS(devvp, VREAD, p->p_ucred, p); VOP_UNLOCK(devvp, 0, p); if (error) { vrele(devvp); return (error); } } if ((error = udf_mountfs(devvp, mp, p))) { vrele(devvp); return (error); } /* * Keep a copy of the mount information. */ copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &len); bzero(mp->mnt_stat.f_mntonname + len, MNAMELEN - len); copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, &len); bzero(mp->mnt_stat.f_mntfromname + len, MNAMELEN - len); return (0); }; /* * Check the descriptor tag for both the correct id and correct checksum. * Return zero if all is good, EINVAL if not. */ int udf_checktag(struct desc_tag *tag, uint16_t id) { uint8_t *itag; uint8_t i, cksum = 0; itag = (uint8_t *)tag; if (tag->id != id) return (EINVAL); for (i = 0; i < 15; i++) cksum = cksum + itag[i]; cksum = cksum - itag[4]; if (cksum == tag->cksum) return (0); return (EINVAL); } /* * Do a lazy probe on the underlying media to check if it's an UDF volume, in * which case we fake a disklabel for it. */ int udf_disklabelspoof(dev_t dev, void (*strat)(struct buf *), struct disklabel *lp) { char vid[32]; int i, bsize = 2048, error = EINVAL; uint32_t sector = 256, mvds_start, mvds_end; struct buf *bp; struct anchor_vdp avdp; struct pri_vol_desc *pvd; /* * Get a buffer to work with. */ bp = geteblk(bsize); bp->b_dev = dev; /* * Look for an Anchor Volume Descriptor at sector 256. */ bp->b_blkno = sector * btodb(bsize); bp->b_bcount = bsize; bp->b_flags = B_BUSY | B_READ; bp->b_resid = bp->b_blkno / lp->d_secpercyl; (*strat)(bp); if (biowait(bp)) goto out; if (udf_checktag((struct desc_tag *)bp->b_data, TAGID_ANCHOR)) goto out; bcopy(bp->b_data, &avdp, sizeof(avdp)); mvds_start = letoh32(avdp.main_vds_ex.loc); mvds_end = mvds_start + (letoh32(avdp.main_vds_ex.len) - 1) / bsize; /* * Then try to find a reference to a Primary Volume Descriptor. */ for (sector = mvds_start; sector < mvds_end; sector++) { bp->b_blkno = sector * btodb(bsize); bp->b_bcount = bsize; bp->b_flags = B_BUSY | B_READ; bp->b_resid = bp->b_blkno / lp->d_secpercyl; (*strat)(bp); if (biowait(bp)) goto out; pvd = (struct pri_vol_desc *)bp->b_data; if (!udf_checktag(&pvd->tag, TAGID_PRI_VOL)) break; } /* * If we couldn't find a reference, bail out. */ if (sector == mvds_end) goto out; /* * Okay, it's an UDF volume. Spoof a disklabel for it. */ if (udf_transname(pvd->vol_id, vid, sizeof(pvd->vol_id), NULL)) strlcpy(lp->d_typename, vid, sizeof(lp->d_typename)); for (i = 0; i < MAXPARTITIONS; i++) { lp->d_partitions[i].p_size = 0; lp->d_partitions[i].p_offset = 0; } /* * Fake two partitions, 'a' and 'c'. */ lp->d_partitions[0].p_size = lp->d_secperunit; lp->d_partitions[0].p_fstype = FS_UDF; lp->d_partitions[RAW_PART].p_size = lp->d_secperunit; lp->d_partitions[RAW_PART].p_fstype = FS_UDF; 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); error = 0; out: bp->b_flags |= B_INVAL; brelse(bp); return (error); } int udf_mountfs(struct vnode *devvp, struct mount *mp, struct proc *p) { struct buf *bp = NULL; struct anchor_vdp avdp; struct udf_mnt *udfmp = NULL; struct part_desc *pd; struct logvol_desc *lvd; struct fileset_desc *fsd; struct file_entry *root_fentry; uint32_t sector, size, mvds_start, mvds_end; uint32_t fsd_offset = 0; uint16_t part_num = 0, fsd_part = 0; int error = EINVAL; int logvol_found = 0, part_found = 0, fsd_found = 0; int bsize; /* * 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))) return (error); if (vcount(devvp) > 1 && devvp != rootvp) return (EBUSY); vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, p); error = vinvalbuf(devvp, V_SAVE, p->p_ucred, p, 0, 0); VOP_UNLOCK(devvp, 0, p); if (error) return (error); error = VOP_OPEN(devvp, FREAD, FSCRED, p); if (error) return (error); MALLOC(udfmp, struct udf_mnt *, sizeof(struct udf_mnt), M_UDFMOUNT, M_WAITOK); bzero(udfmp, sizeof(struct udf_mnt)); mp->mnt_data = (qaddr_t)udfmp; mp->mnt_stat.f_fsid.val[0] = devvp->v_rdev; mp->mnt_stat.f_fsid.val[1] = makefstype(MOUNT_UDF); mp->mnt_flag |= MNT_LOCAL; udfmp->im_mountp = mp; udfmp->im_dev = devvp->v_rdev; udfmp->im_devvp = devvp; bsize = 2048; /* XXX Should probe the media for its size. */ /* * Get the Anchor Volume Descriptor Pointer from sector 256. * XXX Should also check sector n - 256, n, and 512. */ sector = 256; if ((error = bread(devvp, sector * btodb(bsize), bsize, NOCRED, &bp)) != 0) goto bail; if ((error = udf_checktag((struct desc_tag *)bp->b_data, TAGID_ANCHOR))) goto bail; bcopy(bp->b_data, &avdp, sizeof(struct anchor_vdp)); brelse(bp); bp = NULL; /* * Extract the Partition Descriptor and Logical Volume Descriptor * from the Volume Descriptor Sequence. * XXX Should we care about the partition type right now? * XXX What about multiple partitions? */ mvds_start = letoh32(avdp.main_vds_ex.loc); mvds_end = mvds_start + (letoh32(avdp.main_vds_ex.len) - 1) / bsize; for (sector = mvds_start; sector < mvds_end; sector++) { if ((error = bread(devvp, sector * btodb(bsize), bsize, NOCRED, &bp)) != 0) { printf("Can't read sector %d of VDS\n", sector); goto bail; } lvd = (struct logvol_desc *)bp->b_data; if (!udf_checktag(&lvd->tag, TAGID_LOGVOL)) { udfmp->bsize = letoh32(lvd->lb_size); udfmp->bmask = udfmp->bsize - 1; udfmp->bshift = ffs(udfmp->bsize) - 1; fsd_part = letoh16(lvd->_lvd_use.fsd_loc.loc.part_num); fsd_offset = letoh32(lvd->_lvd_use.fsd_loc.loc.lb_num); if (udf_find_partmaps(udfmp, lvd)) break; logvol_found = 1; } pd = (struct part_desc *)bp->b_data; if (!udf_checktag(&pd->tag, TAGID_PARTITION)) { part_found = 1; part_num = letoh16(pd->part_num); udfmp->part_len = letoh32(pd->part_len); udfmp->part_start = letoh32(pd->start_loc); } brelse(bp); bp = NULL; if ((part_found) && (logvol_found)) break; } if (!part_found || !logvol_found) { error = EINVAL; goto bail; } if (fsd_part != part_num) { printf("FSD does not lie within the partition!\n"); error = EINVAL; goto bail; } /* * Grab the Fileset Descriptor * Thanks to Chuck McCrobie for pointing * me in the right direction here. */ sector = udfmp->part_start + fsd_offset; if ((error = RDSECTOR(devvp, sector, udfmp->bsize, &bp)) != 0) { printf("Cannot read sector %d of FSD\n", sector); goto bail; } fsd = (struct fileset_desc *)bp->b_data; if (!udf_checktag(&fsd->tag, TAGID_FSD)) { fsd_found = 1; bcopy(&fsd->rootdir_icb, &udfmp->root_icb, sizeof(struct long_ad)); } brelse(bp); bp = NULL; if (!fsd_found) { printf("Couldn't find the fsd\n"); error = EINVAL; goto bail; } /* * Find the file entry for the root directory. */ sector = letoh32(udfmp->root_icb.loc.lb_num) + udfmp->part_start; size = letoh32(udfmp->root_icb.len); if ((error = udf_readlblks(udfmp, sector, size, &bp)) != 0) { printf("Cannot read sector %d\n", sector); goto bail; } root_fentry = (struct file_entry *)bp->b_data; if ((error = udf_checktag(&root_fentry->tag, TAGID_FENTRY))) { printf("Invalid root file entry!\n"); goto bail; } brelse(bp); bp = NULL; mtx_init(&udfmp->hash_mtx, IPL_NONE); udfmp->hashtbl = hashinit(UDF_HASHTBLSIZE, M_UDFMOUNT, M_WAITOK, &udfmp->hashsz); devvp->v_specmountpoint = mp; return (0); bail: if (udfmp != NULL) FREE(udfmp, M_UDFMOUNT); if (bp != NULL) brelse(bp); VOP_CLOSE(devvp, FREAD, FSCRED, p); return (error); }; int udf_unmount(struct mount *mp, int mntflags, struct proc *p) { struct udf_mnt *udfmp; struct vnode *devvp; int error, flags = 0; udfmp = VFSTOUDFFS(mp); devvp = udfmp->im_devvp; if (mntflags & MNT_FORCE) flags |= FORCECLOSE; if ((error = vflush(mp, NULL, flags))) return (error); vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, p); vinvalbuf(devvp, V_SAVE, NOCRED, p, 0, 0); error = VOP_CLOSE(devvp, FREAD, NOCRED, p); VOP_UNLOCK(devvp, 0, p); if (error) return (error); devvp->v_specmountpoint = NULL; vrele(devvp); if (udfmp->s_table != NULL) FREE(udfmp->s_table, M_UDFMOUNT); if (udfmp->hashtbl != NULL) FREE(udfmp->hashtbl, M_UDFMOUNT); FREE(udfmp, M_UDFMOUNT); mp->mnt_data = (qaddr_t)0; mp->mnt_flag &= ~MNT_LOCAL; return (0); } int udf_root(struct mount *mp, struct vnode **vpp) { struct udf_mnt *udfmp; struct vnode *vp; ino_t id; int error; udfmp = VFSTOUDFFS(mp); id = udf_getid(&udfmp->root_icb); error = udf_vget(mp, id, vpp); if (error) return (error); vp = *vpp; vp->v_flag |= VROOT; udfmp->root_vp = vp; return (0); } int udf_quotactl(struct mount *mp, int cmds, uid_t uid, caddr_t arg, struct proc *p) { return (EOPNOTSUPP); } int udf_statfs(struct mount *mp, struct statfs *sbp, struct proc *p) { struct udf_mnt *udfmp; udfmp = VFSTOUDFFS(mp); sbp->f_bsize = udfmp->bsize; sbp->f_iosize = udfmp->bsize; sbp->f_blocks = udfmp->part_len; sbp->f_bfree = 0; sbp->f_bavail = 0; sbp->f_files = 0; sbp->f_ffree = 0; return (0); } int udf_sync(struct mount *mp, int waitfor, struct ucred *cred, struct proc *p) { return (0); } int udf_vget(struct mount *mp, ino_t ino, struct vnode **vpp) { struct buf *bp; struct vnode *devvp; struct udf_mnt *udfmp; struct proc *p; struct vnode *vp; struct udf_node *unode; struct file_entry *fe; int error, sector, size; p = curproc; bp = NULL; *vpp = NULL; udfmp = VFSTOUDFFS(mp); /* See if we already have this in the cache */ if ((error = udf_hashlookup(udfmp, ino, LK_EXCLUSIVE, vpp)) != 0) return (error); if (*vpp != NULL) return (0); /* * Allocate memory and check the tag id's before grabbing a new * vnode, since it's hard to roll back if there is a problem. */ unode = pool_get(&udf_node_pool, PR_WAITOK); bzero(unode, sizeof(struct udf_node)); /* * Copy in the file entry. Per the spec, the size can only be 1 block. */ sector = ino + udfmp->part_start; devvp = udfmp->im_devvp; if ((error = RDSECTOR(devvp, sector, udfmp->bsize, &bp)) != 0) { printf("Cannot read sector %d\n", sector); pool_put(&udf_node_pool, unode); if (bp != NULL) brelse(bp); return (error); } fe = (struct file_entry *)bp->b_data; if (udf_checktag(&fe->tag, TAGID_FENTRY)) { printf("Invalid file entry!\n"); pool_put(&udf_node_pool, unode); brelse(bp); return (ENOMEM); } size = UDF_FENTRY_SIZE + letoh32(fe->l_ea) + letoh32(fe->l_ad); MALLOC(unode->fentry, struct file_entry *, size, M_UDFFENTRY, M_NOWAIT); if (unode->fentry == NULL) { printf("Cannot allocate file entry block\n"); pool_put(&udf_node_pool, unode); brelse(bp); return (ENOMEM); } bcopy(bp->b_data, unode->fentry, size); brelse(bp); bp = NULL; if ((error = udf_allocv(mp, &vp, p))) { printf("Error from udf_allocv\n"); pool_put(&udf_node_pool, unode); return (error); } unode->i_vnode = vp; unode->hash_id = ino; unode->i_devvp = udfmp->im_devvp; unode->i_dev = udfmp->im_dev; unode->udfmp = udfmp; vp->v_data = unode; VREF(udfmp->im_devvp); lockinit(&unode->i_lock, PINOD, "unode", 0, 0); /* * udf_hashins() will lock the vnode for us. */ udf_hashins(unode); switch (unode->fentry->icbtag.file_type) { default: vp->v_type = VBAD; break; case 4: vp->v_type = VDIR; break; case 5: vp->v_type = VREG; break; case 6: vp->v_type = VBLK; break; case 7: vp->v_type = VCHR; break; case 9: vp->v_type = VFIFO; break; case 10: vp->v_type = VSOCK; break; case 12: vp->v_type = VLNK; break; } *vpp = vp; return (0); } struct ifid { u_short ifid_len; u_short ifid_pad; int ifid_ino; long ifid_start; }; int udf_fhtovp(struct mount *mp, struct fid *fhp, struct vnode **vpp) { struct ifid *ifhp; struct vnode *nvp; int error; ifhp = (struct ifid *)fhp; if ((error = VFS_VGET(mp, ifhp->ifid_ino, &nvp)) != 0) { *vpp = NULLVP; return (error); } *vpp = nvp; return (0); } int udf_vptofh(struct vnode *vp, struct fid *fhp) { struct udf_node *node; struct ifid *ifhp; node = VTON(vp); ifhp = (struct ifid *)fhp; ifhp->ifid_len = sizeof(struct ifid); ifhp->ifid_ino = node->hash_id; return (0); } int udf_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp, void *newp, size_t newlen, struct proc *p) { return (EINVAL); } int udf_checkexp(struct mount *mp, struct mbuf *nam, int *exflagsp, struct ucred **credanonp) { /* For the time being. */ return (EACCES); } int udf_find_partmaps(struct udf_mnt *udfmp, struct logvol_desc *lvd) { union udf_pmap *pmap; struct part_map_spare *pms; struct regid *pmap_id; struct buf *bp; unsigned char regid_id[UDF_REGID_ID_SIZE + 1]; int i, ptype, psize, error; for (i = 0; i < letoh32(lvd->n_pm); i++) { pmap = (union udf_pmap *)&lvd->maps[i * UDF_PMAP_SIZE]; ptype = pmap->data[0]; psize = pmap->data[1]; if (((ptype != 1) && (ptype != 2)) || ((psize != UDF_PMAP_SIZE) && (psize != 6))) { printf("Invalid partition map found\n"); return (1); } if (ptype == 1) { /* Type 1 map. We don't care */ continue; } /* Type 2 map. Gotta find out the details */ pmap_id = (struct regid *)&pmap->data[4]; bzero(®id_id[0], UDF_REGID_ID_SIZE); bcopy(&pmap_id->id[0], ®id_id[0], UDF_REGID_ID_SIZE); if (bcmp(®id_id[0], "*UDF Sparable Partition", UDF_REGID_ID_SIZE)) { printf("Unsupported partition map: %s\n", ®id_id[0]); return (1); } pms = &pmap->pms; MALLOC(udfmp->s_table, struct udf_sparing_table *, letoh32(pms->st_size), M_UDFMOUNT, M_NOWAIT); if (udfmp->s_table == NULL) return (ENOMEM); bzero(udfmp->s_table, letoh32(pms->st_size)); /* Calculate the number of sectors per packet. */ /* XXX Logical or physical? */ udfmp->p_sectors = letoh16(pms->packet_len) / udfmp->bsize; /* * XXX If reading the first Sparing Table fails, should look * for another table. */ if ((error = udf_readlblks(udfmp, letoh32(pms->st_loc[0]), letoh32(pms->st_size), &bp)) != 0) { if (bp != NULL) brelse(bp); printf("Failed to read Sparing Table at sector %d\n", letoh32(pms->st_loc[0])); return (error); } bcopy(bp->b_data, udfmp->s_table, letoh32(pms->st_size)); brelse(bp); if (udf_checktag(&udfmp->s_table->tag, 0)) { printf("Invalid sparing table found\n"); return (EINVAL); } /* * See how many valid entries there are here. The list is * supposed to be sorted. 0xfffffff0 and higher are not valid */ for (i = 0; i < letoh16(udfmp->s_table->rt_l); i++) { udfmp->s_table_entries = i; if (letoh32(udfmp->s_table->entries[i].org) >= 0xfffffff0) break; } } return (0); }