/* $OpenBSD: udf_vfsops.c,v 1.23 2006/08/07 15:50:42 pedro Exp $ */
/*
* Copyright (c) 2001, 2002 Scott Long <scottl@freebsd.org>
* 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 <pedro@openbsd.org> 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.
*/
#include <sys/types.h>
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/uio.h>
#include <sys/buf.h>
#include <sys/conf.h>
#include <sys/dirent.h>
#include <sys/fcntl.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/mutex.h>
#include <sys/mount.h>
#include <sys/namei.h>
#include <sys/pool.h>
#include <sys/proc.h>
#include <sys/lock.h>
#include <sys/queue.h>
#include <sys/vnode.h>
#include <sys/endian.h>
#include <miscfs/specfs/specdev.h>
#include <isofs/udf/ecma167-udf.h>
#include <isofs/udf/udf.h>
#include <isofs/udf/udf_extern.h>
struct pool udf_trans_pool;
struct pool unode_pool;
struct pool udf_ds_pool;
int udf_find_partmaps(struct umount *, struct logvol_desc *);
int udf_get_vpartmap(struct umount *, struct part_map_virt *);
int udf_get_spartmap(struct umount *, struct part_map_spare *);
int udf_mountfs(struct vnode *, struct mount *, uint32_t, struct proc *);
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_init(struct vfsconf *foo)
{
pool_init(&udf_trans_pool, MAXNAMLEN * sizeof(unicode_t), 0, 0, 0,
"udftrpl", &pool_allocator_nointr);
pool_init(&unode_pool, sizeof(struct unode), 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, args.lastblock, 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 (letoh16(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);
}
int
udf_mountfs(struct vnode *devvp, struct mount *mp, uint32_t lb, struct proc *p)
{
struct buf *bp = NULL;
struct anchor_vdp avdp;
struct umount *ump = 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(ump, struct umount *, sizeof(struct umount), M_UDFMOUNT,
M_WAITOK);
bzero(ump, sizeof(struct umount));
mp->mnt_data = (qaddr_t) ump;
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;
ump->um_mountp = mp;
ump->um_dev = devvp->v_rdev;
ump->um_devvp = devvp;
bsize = 2048; /* Should probe the media for its size. */
/*
* Get the Anchor Volume Descriptor Pointer from sector 256.
* 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.
* Should we care about the partition type right now?
* 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)) {
ump->um_bsize = letoh32(lvd->lb_size);
ump->um_bmask = ump->um_bsize - 1;
ump->um_bshift = ffs(ump->um_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(ump, 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);
ump->um_len = letoh32(pd->part_len);
ump->um_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;
}
mtx_init(&ump->um_hashmtx, IPL_NONE);
ump->um_hashtbl = hashinit(UDF_HASHTBLSIZE, M_UDFMOUNT, M_WAITOK,
&ump->um_hashsz);
/* Get the VAT, if needed */
if (ump->um_flags & UDF_MNT_FIND_VAT) {
error = udf_vat_get(ump, lb);
if (error)
goto bail;
}
/*
* Grab the Fileset Descriptor
* Thanks to Chuck McCrobie <mccrobie@cablespeed.com> for pointing
* me in the right direction here.
*/
sector = fsd_offset;
udf_vat_map(ump, §or);
if ((error = RDSECTOR(devvp, sector, ump->um_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, &ump->um_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(ump->um_root_icb.loc.lb_num);
size = letoh32(ump->um_root_icb.len);
udf_vat_map(ump, §or);
if ((error = udf_readlblks(ump, 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;
devvp->v_specmountpoint = mp;
return (0);
bail:
if (ump->um_hashtbl != NULL)
free(ump->um_hashtbl, M_UDFMOUNT);
if (ump != NULL) {
FREE(ump, M_UDFMOUNT);
mp->mnt_data = NULL;
mp->mnt_flag &= ~MNT_LOCAL;
}
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 umount *ump;
struct vnode *devvp;
int error, flags = 0;
ump = VFSTOUDFFS(mp);
devvp = ump->um_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 (ump->um_flags & UDF_MNT_USES_VAT)
free(ump->um_vat, M_UDFMOUNT);
if (ump->um_stbl != NULL)
free(ump->um_stbl, M_UDFMOUNT);
if (ump->um_hashtbl != NULL)
free(ump->um_hashtbl, M_UDFMOUNT);
FREE(ump, 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 umount *ump;
struct vnode *vp;
ino_t id;
int error;
ump = VFSTOUDFFS(mp);
id = udf_getid(&ump->um_root_icb);
error = udf_vget(mp, id, vpp);
if (error)
return (error);
vp = *vpp;
vp->v_flag |= VROOT;
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 umount *ump;
ump = VFSTOUDFFS(mp);
sbp->f_bsize = ump->um_bsize;
sbp->f_iosize = ump->um_bsize;
sbp->f_blocks = ump->um_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 umount *ump;
struct proc *p;
struct vnode *vp;
struct unode *up;
struct file_entry *fe;
int error, sector, size;
p = curproc;
bp = NULL;
*vpp = NULL;
ump = VFSTOUDFFS(mp);
/* See if we already have this in the cache */
if ((error = udf_hashlookup(ump, 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.
*/
up = pool_get(&unode_pool, PR_WAITOK);
bzero(up, sizeof(struct unode));
/*
* Copy in the file entry. Per the spec, the size can only be 1 block.
*/
sector = ino;
devvp = ump->um_devvp;
udf_vat_map(ump, §or);
if ((error = RDSECTOR(devvp, sector, ump->um_bsize, &bp)) != 0) {
printf("Cannot read sector %d\n", sector);
pool_put(&unode_pool, up);
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(&unode_pool, up);
brelse(bp);
return (ENOMEM);
}
size = UDF_FENTRY_SIZE + letoh32(fe->l_ea) + letoh32(fe->l_ad);
up->u_fentry = malloc(size, M_UDFFENTRY, M_NOWAIT);
if (up->u_fentry == NULL) {
pool_put(&unode_pool, up);
brelse(bp);
return (ENOMEM); /* Cannot allocate file entry block */
}
bcopy(bp->b_data, up->u_fentry, size);
brelse(bp);
bp = NULL;
if ((error = udf_allocv(mp, &vp, p))) {
free(up->u_fentry, M_UDFFENTRY);
pool_put(&unode_pool, up);
return (error); /* Error from udf_allocv() */
}
up->u_vnode = vp;
up->u_ino = ino;
up->u_devvp = ump->um_devvp;
up->u_dev = ump->um_dev;
up->u_ump = ump;
vp->v_data = up;
VREF(ump->um_devvp);
lockinit(&up->u_lock, PINOD, "unode", 0, 0);
/*
* udf_hashins() will lock the vnode for us.
*/
udf_hashins(up);
switch (up->u_fentry->icbtag.file_type) {
default:
vp->v_type = VBAD;
break;
case UDF_ICB_TYPE_DIR:
vp->v_type = VDIR;
break;
case UDF_ICB_TYPE_FILE:
vp->v_type = VREG;
break;
case UDF_ICB_TYPE_BLKDEV:
vp->v_type = VBLK;
break;
case UDF_ICB_TYPE_CHRDEV:
vp->v_type = VCHR;
break;
case UDF_ICB_TYPE_FIFO:
vp->v_type = VFIFO;
break;
case UDF_ICB_TYPE_SOCKET:
vp->v_type = VSOCK;
break;
case UDF_ICB_TYPE_SYMLINK:
vp->v_type = VLNK;
break;
case UDF_ICB_TYPE_VAT_150:
vp->v_type = VREG;
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 unode *up;
struct ifid *ifhp;
up = VTOU(vp);
ifhp = (struct ifid *)fhp;
ifhp->ifid_len = sizeof(struct ifid);
ifhp->ifid_ino = up->u_ino;
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)
{
return (EACCES); /* For the time being */
}
/* Handle a virtual partition map */
int
udf_get_vpartmap(struct umount *ump, struct part_map_virt *pmv)
{
ump->um_flags |= UDF_MNT_FIND_VAT; /* Should do more than this */
return (0);
}
/* Handle a sparable partition map */
int
udf_get_spartmap(struct umount *ump, struct part_map_spare *pms)
{
struct buf *bp;
int i, error;
ump->um_stbl = malloc(letoh32(pms->st_size), M_UDFMOUNT, M_NOWAIT);
if (ump->um_stbl == NULL)
return (ENOMEM);
bzero(ump->um_stbl, letoh32(pms->st_size));
/* Calculate the number of sectors per packet */
ump->um_psecs = letoh16(pms->packet_len) / ump->um_bsize;
error = udf_readlblks(ump, letoh32(pms->st_loc[0]),
letoh32(pms->st_size), &bp);
if (error) {
if (bp != NULL)
brelse(bp);
free(ump->um_stbl, M_UDFMOUNT);
return (error); /* Failed to read sparing table */
}
bcopy(bp->b_data, ump->um_stbl, letoh32(pms->st_size));
brelse(bp);
if (udf_checktag(&ump->um_stbl->tag, 0)) {
free(ump->um_stbl, M_UDFMOUNT);
return (EINVAL); /* Invalid sparing table found */
}
/*
* 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(ump->um_stbl->rt_l); i++) {
ump->um_stbl_len = i;
if (letoh32(ump->um_stbl->entries[i].org) >= 0xfffffff0)
break;
}
return (0);
}
/* Scan the partition maps */
int
udf_find_partmaps(struct umount *ump, struct logvol_desc *lvd)
{
struct regid *pmap_id;
unsigned char regid_id[UDF_REGID_ID_SIZE + 1];
int i, ptype, psize, error;
uint8_t *pmap = (uint8_t *) &lvd->maps[0];
for (i = 0; i < letoh32(lvd->n_pm); i++) {
ptype = pmap[0];
psize = pmap[1];
if (ptype != 1 && ptype != 2)
return (EINVAL); /* Invalid partition map type */
if (psize != UDF_PMAP_TYPE1_SIZE &&
psize != UDF_PMAP_TYPE2_SIZE)
return (EINVAL); /* Invalid partition map size */
if (ptype == 1) {
pmap += UDF_PMAP_TYPE1_SIZE;
continue;
}
/* Type 2 map. Find out the details */
pmap_id = (struct regid *) &pmap[4];
regid_id[UDF_REGID_ID_SIZE] = '\0';
bcopy(&pmap_id->id[0], ®id_id[0], UDF_REGID_ID_SIZE);
if (!bcmp(®id_id[0], "*UDF Virtual Partition",
UDF_REGID_ID_SIZE))
error = udf_get_vpartmap(ump,
(struct part_map_virt *) pmap);
else if (!bcmp(®id_id[0], "*UDF Sparable Partition",
UDF_REGID_ID_SIZE))
error = udf_get_spartmap(ump,
(struct part_map_spare *) pmap);
else
return (EINVAL); /* Unsupported partition map */
if (error)
return (error); /* Error getting partition */
pmap += UDF_PMAP_TYPE2_SIZE;
}
return (0);
}
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