/*- * 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 1.16 2003/11/05 06:56:08 scottl Exp $ * $DragonFly: src/sys/vfs/udf/udf_vfsops.c,v 1.27 2008/01/06 16:55:53 swildner Exp $ */ /* udf_vfsops.c */ /* Implement the VFS side of things */ /* * 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 extern struct vop_ops udf_vnode_vops; MALLOC_DEFINE(M_UDFNODE, "UDF node", "UDF node structure"); MALLOC_DEFINE(M_UDFMOUNT, "UDF mount", "UDF mount structure"); MALLOC_DEFINE(M_UDFFENTRY, "UDF fentry", "UDF file entry structure"); static int udf_mount(struct mount *, char *, caddr_t, struct ucred *); static int udf_unmount(struct mount *, int); static int udf_root(struct mount *, struct vnode **); static int udf_statfs(struct mount *, struct statfs *, struct ucred *); static int udf_fhtovp(struct mount *, struct fid *, struct vnode **); static int udf_vptofh(struct vnode *, struct fid *); static int udf_find_partmaps(struct udf_mnt *, struct logvol_desc *); static struct vfsops udf_vfsops = { .vfs_mount = udf_mount, .vfs_unmount = udf_unmount, .vfs_root = udf_root, .vfs_statfs = udf_statfs, .vfs_sync = vfs_stdsync, .vfs_vget = udf_vget, .vfs_fhtovp = udf_fhtovp, .vfs_vptofh = udf_vptofh }; VFS_SET(udf_vfsops, udf, VFCF_READONLY); MODULE_VERSION(udf, 1); static int udf_mountfs(struct vnode *, struct mount *); static int udf_mount(struct mount *mp, char *path, caddr_t data, struct ucred *cred) { struct vnode *devvp; /* vnode of the mount device */ struct udf_args args; struct udf_mnt *imp = 0; size_t size; int error; struct nlookupdata nd; if ((mp->mnt_flag & MNT_RDONLY) == 0) return (EROFS); /* * No root filesystem support. Probably not a big deal, since the * bootloader doesn't understand UDF. */ if (mp->mnt_flag & MNT_ROOTFS) return (ENOTSUP); if ((error = copyin(data, (caddr_t)&args, sizeof(struct udf_args)))) return(error); if (mp->mnt_flag & MNT_UPDATE) { imp = VFSTOUDFFS(mp); if (args.fspec == NULL) return(vfs_export(mp, &imp->im_export, &args.export)); } /* Check that the mount device exists */ devvp = NULL; error = nlookup_init(&nd, args.fspec, UIO_USERSPACE, NLC_FOLLOW); if (error == 0) error = nlookup(&nd); if (error == 0) error = cache_vref(&nd.nl_nch, nd.nl_cred, &devvp); nlookup_done(&nd); if (error) return (error); if (vn_isdisk(devvp, &error) == 0) { vrele(devvp); return(error); } /* Check the access rights on the mount device */ vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); error = VOP_ACCESS(devvp, VREAD, cred); if (error) error = suser_cred(cred, 0); if (error) { vput(devvp); return(error); } vn_unlock(devvp); if ((error = udf_mountfs(devvp, mp))) { vrele(devvp); return(error); } imp = VFSTOUDFFS(mp); imp->im_flags = args.flags; copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, &size); bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); udf_statfs(mp, &mp->mnt_stat, cred); 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); } static int udf_mountfs(struct vnode *devvp, struct mount *mp) { 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; cdev_t dev; uint32_t sector, size, mvds_start, mvds_end; uint32_t fsd_offset = 0; uint16_t part_num = 0, fsd_part = 0; int error = EINVAL, needclose = 0; int logvol_found = 0, part_found = 0, fsd_found = 0; int bsize; /* * Disallow multiple mounts of the same device. Flush the buffer * cache for the device. */ if ((error = vfs_mountedon(devvp))) return(error); if (count_udev(devvp->v_umajor, devvp->v_uminor) > 0) return(EBUSY); if ((error = vinvalbuf(devvp, V_SAVE, 0, 0))) return(error); vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); error = VOP_OPEN(devvp, FREAD, FSCRED, NULL); vn_unlock(devvp); if (error) return(error); needclose = 1; dev = devvp->v_rdev; udfmp = kmalloc(sizeof(*udfmp), M_UDFMOUNT, M_WAITOK | M_ZERO); mp->mnt_data = (qaddr_t)udfmp; mp->mnt_stat.f_fsid.val[0] = dev2udev(dev); mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum; mp->mnt_maxsymlinklen = 0; mp->mnt_flag |= MNT_LOCAL; udfmp->im_mountp = mp; udfmp->im_dev = dev; udfmp->im_devvp = devvp; bsize = 2048; /* XXX Should probe the media for it's 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, (off_t)sector * bsize, bsize, &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 = avdp.main_vds_ex.loc; mvds_end = mvds_start + (avdp.main_vds_ex.len - 1) / bsize; for (sector = mvds_start; sector < mvds_end; sector++) { if ((error = bread(devvp, (off_t)sector * bsize, bsize, &bp)) != 0) { kprintf("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 = lvd->lb_size; udfmp->bmask = udfmp->bsize - 1; udfmp->bshift = ffs(udfmp->bsize) - 1; fsd_part = lvd->_lvd_use.fsd_loc.loc.part_num; fsd_offset = 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 = pd->part_num; udfmp->part_len = pd->part_len; udfmp->part_start = 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) { kprintf("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) { kprintf("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) { kprintf("Couldn't find the fsd\n"); error = EINVAL; goto bail; } vfs_add_vnodeops(mp, &udf_vnode_vops, &mp->mnt_vn_norm_ops); /* * Find the file entry for the root directory. */ sector = udfmp->root_icb.loc.lb_num + udfmp->part_start; size = udfmp->root_icb.len; if ((error = udf_readlblks(udfmp, sector, size, &bp)) != 0) { kprintf("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))) { kprintf("Invalid root file entry!\n"); goto bail; } brelse(bp); bp = NULL; lwkt_token_init(&udfmp->hash_token); udfmp->hashtbl = phashinit(UDF_HASHTBLSIZE, M_UDFMOUNT, &udfmp->hashsz); return(0); bail: if (udfmp != NULL) kfree(udfmp, M_UDFMOUNT); if (bp != NULL) brelse(bp); if (needclose) VOP_CLOSE(devvp, FREAD); return(error); } static int udf_unmount(struct mount *mp, int mntflags) { struct udf_mnt *udfmp; int error, flags = 0; udfmp = VFSTOUDFFS(mp); if (mntflags & MNT_FORCE) flags |= FORCECLOSE; if ((error = vflush(mp, 0, flags))) return (error); udfmp->im_devvp->v_rdev->si_mountpoint = NULL; error = VOP_CLOSE(udfmp->im_devvp, FREAD); vrele(udfmp->im_devvp); if (udfmp->s_table) kfree(udfmp->s_table, M_UDFMOUNT); if (udfmp->hashtbl) kfree(udfmp->hashtbl, M_UDFMOUNT); kfree(udfmp, M_UDFMOUNT); mp->mnt_data = (qaddr_t)0; mp->mnt_flag &= ~MNT_LOCAL; return (error); } static 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); } static int udf_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred) { 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; if (sbp != &mp->mnt_stat) { sbp->f_type = mp->mnt_vfc->vfc_typenum; bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); } 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 thread *td; struct vnode *vp; struct udf_node *unode; struct file_entry *fe; int error, sector, size; td = curthread; udfmp = VFSTOUDFFS(mp); /* See if we already have this in the cache */ if ((error = udf_hashlookup(udfmp, ino, 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 = kmalloc(sizeof(*unode), M_UDFNODE, M_WAITOK | M_ZERO); /* * 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) { kprintf("Cannot read sector %d\n", sector); kfree(unode, M_UDFNODE); return(error); } fe = (struct file_entry *)bp->b_data; if (udf_checktag(&fe->tag, TAGID_FENTRY)) { kprintf("Invalid file entry!\n"); kfree(unode, M_UDFNODE); brelse(bp); return(ENOMEM); } size = UDF_FENTRY_SIZE + fe->l_ea + fe->l_ad; unode->fentry = kmalloc(size, M_UDFFENTRY, M_WAITOK | M_ZERO); bcopy(bp->b_data, unode->fentry, size); brelse(bp); bp = NULL; if ((error = udf_allocv(mp, &vp))) { kprintf("Error from udf_allocv\n"); kfree(unode, M_UDFNODE); 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); 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; } /* * Locked and refd vnode returned */ *vpp = vp; return(0); } struct ifid { u_short ifid_len; u_short ifid_pad; int ifid_ino; long ifid_start; }; static 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); } static 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); } static 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 ptype, psize, error; unsigned int i; for (i = 0; i < 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))) { kprintf("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)) { kprintf("Unsupported partition map: %s\n", ®id_id[0]); return(1); } pms = &pmap->pms; udfmp->s_table = kmalloc(pms->st_size, M_UDFMOUNT, M_WAITOK | M_ZERO); /* Calculate the number of sectors per packet. */ /* XXX Logical or physical? */ udfmp->p_sectors = pms->packet_len / udfmp->bsize; /* * XXX If reading the first Sparing Table fails, should look * for another table. */ if ((error = udf_readlblks(udfmp, pms->st_loc[0], pms->st_size, &bp)) != 0) { if (bp) brelse(bp); kprintf("Failed to read Sparing Table at sector %d\n", pms->st_loc[0]); return(error); } bcopy(bp->b_data, udfmp->s_table, pms->st_size); brelse(bp); if (udf_checktag(&udfmp->s_table->tag, 0)) { kprintf("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 < udfmp->s_table->rt_l; i++) { udfmp->s_table_entries = i; if (udfmp->s_table->entries[i].org >= 0xfffffff0) break; } } return(0); }