/*
* Return buffer with the contents of block "offset" from the beginning of
* directory "ip". If "res" is non-zero, fill it in with a pointer to the
* remaining space in the directory.
*/
int
cd9660_blkatoff(struct vnode *vp, off_t offset, char **res, struct buf **bpp)
{
struct iso_node *ip;
struct iso_mnt *imp;
struct buf *bp;
daddr_t lbn;
int bsize, error;
ip = VTOI(vp);
imp = ip->i_mnt;
lbn = cd9660_lblkno(imp, offset);
bsize = cd9660_blksize(imp, ip, lbn);
if ((error = bread(vp, lbn, bsize, NOCRED, 0, &bp)) != 0) {
*bpp = NULL;
return (error);
}
if (res)
*res = (char *)bp->b_data + cd9660_blkoff(imp, offset);
*bpp = bp;
return (0);
}
/*
* Vnode op for reading.
*/
int
cd9660_read(void *v)
{
struct vop_read_args /* {
struct vnode *a_vp;
struct uio *a_uio;
int a_ioflag;
kauth_cred_t a_cred;
} */ *ap = v;
struct vnode *vp = ap->a_vp;
struct uio *uio = ap->a_uio;
struct iso_node *ip = VTOI(vp);
struct iso_mnt *imp;
struct buf *bp;
daddr_t lbn, rablock;
off_t diff;
int rasize, error = 0;
long size, n, on;
if (uio->uio_resid == 0)
return (0);
if (uio->uio_offset < 0)
return (EINVAL);
if (uio->uio_offset >= ip->i_size)
return 0;
ip->i_flag |= IN_ACCESS;
imp = ip->i_mnt;
if (vp->v_type == VREG) {
const int advice = IO_ADV_DECODE(ap->a_ioflag);
error = 0;
while (uio->uio_resid > 0) {
vsize_t bytelen = MIN(ip->i_size - uio->uio_offset,
uio->uio_resid);
if (bytelen == 0)
break;
error = ubc_uiomove(&vp->v_uobj, uio, bytelen, advice,
UBC_READ | UBC_PARTIALOK | UBC_UNMAP_FLAG(vp));
if (error)
break;
}
goto out;
}
do {
lbn = cd9660_lblkno(imp, uio->uio_offset);
on = cd9660_blkoff(imp, uio->uio_offset);
n = MIN(imp->logical_block_size - on, uio->uio_resid);
diff = (off_t)ip->i_size - uio->uio_offset;
if (diff <= 0)
return (0);
if (diff < n)
n = diff;
size = cd9660_blksize(imp, ip, lbn);
rablock = lbn + 1;
if (cd9660_lblktosize(imp, rablock) < ip->i_size) {
rasize = cd9660_blksize(imp, ip, rablock);
error = breadn(vp, lbn, size, &rablock,
&rasize, 1, NOCRED, 0, &bp);
} else {
error = bread(vp, lbn, size, NOCRED, 0, &bp);
}
if (error) {
return (error);
}
n = MIN(n, size - bp->b_resid);
error = uiomove((char *)bp->b_data + on, (int)n, uio);
brelse(bp, 0);
} while (error == 0 && uio->uio_resid > 0 && n != 0);
out:
return (error);
}
int
cd9660_vget_internal(struct mount *mp, ino_t ino, struct vnode **vpp,
int relocated, struct iso_directory_record *isodir)
{
struct iso_mnt *imp;
struct iso_node *ip;
struct buf *bp;
struct vnode *vp;
dev_t dev;
int error;
imp = VFSTOISOFS(mp);
dev = imp->im_dev;
retry:
if ((*vpp = cd9660_ihashget(dev, ino, LK_EXCLUSIVE)) != NULLVP)
return (0);
/* Allocate a new vnode/iso_node. */
error = getnewvnode(VT_ISOFS, mp, cd9660_vnodeop_p, NULL, &vp);
if (error) {
*vpp = NULLVP;
return (error);
}
ip = pool_get(&cd9660_node_pool, PR_WAITOK);
/*
* If someone beat us to it, put back the freshly allocated
* vnode/inode pair and retry.
*/
mutex_enter(&cd9660_hashlock);
if (cd9660_ihashget(dev, ino, 0) != NULL) {
mutex_exit(&cd9660_hashlock);
ungetnewvnode(vp);
pool_put(&cd9660_node_pool, ip);
goto retry;
}
memset(ip, 0, sizeof(struct iso_node));
vp->v_data = ip;
ip->i_vnode = vp;
ip->i_dev = dev;
ip->i_number = ino;
ip->i_mnt = imp;
ip->i_devvp = imp->im_devvp;
genfs_node_init(vp, &cd9660_genfsops);
/*
* 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);
mutex_exit(&cd9660_hashlock);
if (isodir == 0) {
int lbn, off;
lbn = cd9660_lblkno(imp, ino);
if (lbn >= imp->volume_space_size) {
vput(vp);
printf("fhtovp: lbn exceed volume space %d\n", lbn);
return (ESTALE);
}
off = cd9660_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, 0, &bp);
if (error) {
vput(vp);
printf("fhtovp: bread error %d\n",error);
return (error);
}
isodir = (struct iso_directory_record *)((char *)bp->b_data + off);
if (off + isonum_711(isodir->length) >
imp->logical_block_size) {
vput(vp);
if (bp != 0)
brelse(bp, 0);
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, 0);
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;
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, 0);
if ((error = cd9660_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)))
cd9660_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, 0);
break;
}
case ISO_FTYPE_RRIP:
cd9660_rrip_analyze(isodir, ip, imp);
break;
}
if (bp != 0)
brelse(bp, 0);
/*
* 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
*/
vp->v_op = cd9660_specop_p;
spec_node_init(vp, ip->inode.iso_rdev);
break;
case VLNK:
case VNON:
case VSOCK:
case VDIR:
case VBAD:
break;
case VREG:
uvm_vnp_setsize(vp, ip->i_size);
break;
}
if (vp->v_type != VREG)
uvm_vnp_setsize(vp, 0);
if (ip->iso_extent == imp->root_extent)
vp->v_vflag |= VV_ROOT;
/*
* XXX need generation number?
*/
*vpp = vp;
return (0);
}
