/* $OpenBSD: cd9660_vnops.c,v 1.93 2022/06/26 05:20:42 visa Exp $ */ /* $NetBSD: cd9660_vnops.c,v 1.42 1997/10/16 23:56:57 christos 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. 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_vnops.c 8.15 (Berkeley) 12/5/94 */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include int cd9660_kqfilter(void *v); /* * Structure for reading directories */ struct isoreaddir { struct dirent saveent; struct dirent assocent; struct dirent current; off_t saveoff; off_t assocoff; off_t curroff; struct uio *uio; off_t uio_off; int eofflag; }; int iso_uiodir(struct isoreaddir *, struct dirent *, off_t); int iso_shipdir(struct isoreaddir *); /* * Setattr call. Only allowed for block and character special devices. */ int cd9660_setattr(void *v) { struct vop_setattr_args *ap = v; struct vnode *vp = ap->a_vp; struct vattr *vap = ap->a_vap; if (vap->va_flags != VNOVAL || vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL || vap->va_atime.tv_nsec != VNOVAL || vap->va_mtime.tv_nsec != VNOVAL || vap->va_mode != (mode_t)VNOVAL || (vap->va_vaflags & VA_UTIMES_CHANGE)) return (EROFS); if (vap->va_size != VNOVAL) { switch (vp->v_type) { case VDIR: return (EISDIR); case VLNK: case VREG: return (EROFS); case VCHR: case VBLK: case VSOCK: case VFIFO: return (0); default: return (EINVAL); } } return (EINVAL); } /* * Open called. * * Nothing to do. */ /* ARGSUSED */ int cd9660_open(void *v) { return (0); } /* * Close called * * Update the times on the inode on writeable file systems. */ /* ARGSUSED */ int cd9660_close(void *v) { return (0); } /* * Check mode permission on inode pointer. Mode is READ, WRITE or EXEC. * The mode is shifted to select the owner/group/other fields. The * super user is granted all permissions. */ int cd9660_access(void *v) { struct vop_access_args *ap = v; struct iso_node *ip = VTOI(ap->a_vp); return (vaccess(ap->a_vp->v_type, ip->inode.iso_mode & ALLPERMS, ip->inode.iso_uid, ip->inode.iso_gid, ap->a_mode, ap->a_cred)); } int cd9660_getattr(void *v) { struct vop_getattr_args *ap = v; struct vnode *vp = ap->a_vp; struct vattr *vap = ap->a_vap; struct iso_node *ip = VTOI(vp); vap->va_fsid = ip->i_dev; vap->va_fileid = ip->i_number; vap->va_mode = ip->inode.iso_mode & ALLPERMS; vap->va_nlink = ip->inode.iso_links; vap->va_uid = ip->inode.iso_uid; vap->va_gid = ip->inode.iso_gid; vap->va_atime = ip->inode.iso_atime; vap->va_mtime = ip->inode.iso_mtime; vap->va_ctime = ip->inode.iso_ctime; vap->va_rdev = ip->inode.iso_rdev; vap->va_size = (u_quad_t) ip->i_size; if (ip->i_size == 0 && vp->v_type == VLNK) { struct vop_readlink_args rdlnk; struct iovec aiov; struct uio auio; char *cp; cp = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); aiov.iov_base = cp; aiov.iov_len = MAXPATHLEN; auio.uio_iov = &aiov; auio.uio_iovcnt = 1; auio.uio_offset = 0; auio.uio_rw = UIO_READ; auio.uio_segflg = UIO_SYSSPACE; auio.uio_procp = ap->a_p; auio.uio_resid = MAXPATHLEN; rdlnk.a_uio = &auio; rdlnk.a_vp = ap->a_vp; rdlnk.a_cred = ap->a_cred; if (cd9660_readlink(&rdlnk) == 0) vap->va_size = MAXPATHLEN - auio.uio_resid; free(cp, M_TEMP, 0); } vap->va_flags = 0; vap->va_gen = 1; vap->va_blocksize = ip->i_mnt->logical_block_size; vap->va_bytes = (u_quad_t) ip->i_size; vap->va_type = vp->v_type; return (0); } /* * Vnode op for reading. */ int cd9660_read(void *v) { struct vop_read_args *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 error = 0; long size, on; size_t n; if (uio->uio_resid == 0) return (0); if (uio->uio_offset < 0) return (EINVAL); ip->i_flag |= IN_ACCESS; imp = ip->i_mnt; do { struct cluster_info *ci = &ip->i_ci; lbn = lblkno(imp, uio->uio_offset); on = blkoff(imp, uio->uio_offset); n = ulmin(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 = blksize(imp, ip, lbn); rablock = lbn + 1; #define MAX_RA 32 if (ci->ci_lastr + 1 == lbn) { struct ra { daddr_t blks[MAX_RA]; int sizes[MAX_RA]; } *ra; int i; ra = malloc(sizeof *ra, M_TEMP, M_WAITOK); for (i = 0; i < MAX_RA && lblktosize(imp, (rablock + i)) < ip->i_size; i++) { ra->blks[i] = rablock + i; ra->sizes[i] = blksize(imp, ip, rablock + i); } error = breadn(vp, lbn, size, ra->blks, ra->sizes, i, &bp); free(ra, M_TEMP, 0); } else error = bread(vp, lbn, size, &bp); ci->ci_lastr = lbn; n = ulmin(n, size - bp->b_resid); if (error) { brelse(bp); return (error); } error = uiomove(bp->b_data + on, n, uio); brelse(bp); } while (error == 0 && uio->uio_resid > 0 && n != 0); return (error); } /* ARGSUSED */ int cd9660_ioctl(void *v) { return (ENOTTY); } /* * Mmap a file * * NB Currently unsupported. */ /* ARGSUSED */ int cd9660_mmap(void *v) { return (EINVAL); } /* * Seek on a file * * Nothing to do, so just return. */ /* ARGSUSED */ int cd9660_seek(void *v) { return (0); } int iso_uiodir(struct isoreaddir *idp, struct dirent *dp, off_t off) { int error; dp->d_name[dp->d_namlen] = 0; dp->d_reclen = DIRENT_SIZE(dp); if (idp->uio->uio_resid < dp->d_reclen) { idp->eofflag = 0; return (-1); } dp->d_off = off; if ((error = uiomove(dp, dp->d_reclen, idp->uio)) != 0) return (error); idp->uio_off = off; return (0); } int iso_shipdir(struct isoreaddir *idp) { struct dirent *dp; int cl, sl, assoc; int error; char *cname, *sname; cl = idp->current.d_namlen; cname = idp->current.d_name; if ((assoc = cl > 1 && *cname == ASSOCCHAR)) { cl--; cname++; } dp = &idp->saveent; sname = dp->d_name; if (!(sl = dp->d_namlen)) { dp = &idp->assocent; sname = dp->d_name + 1; sl = dp->d_namlen - 1; } if (sl > 0) { if (sl != cl || bcmp(sname,cname,sl)) { if (idp->assocent.d_namlen) { error = iso_uiodir(idp, &idp->assocent, idp->assocoff); if (error) return (error); idp->assocent.d_namlen = 0; } if (idp->saveent.d_namlen) { error = iso_uiodir(idp, &idp->saveent, idp->saveoff); if (error) return (error); idp->saveent.d_namlen = 0; } } } idp->current.d_reclen = DIRENT_SIZE(&idp->current); if (assoc) { idp->assocoff = idp->curroff; bcopy(&idp->current,&idp->assocent,idp->current.d_reclen); } else { idp->saveoff = idp->curroff; bcopy(&idp->current,&idp->saveent,idp->current.d_reclen); } return (0); } /* * Vnode op for readdir */ int cd9660_readdir(void *v) { struct vop_readdir_args *ap = v; struct uio *uio = ap->a_uio; struct isoreaddir *idp; struct vnode *vdp = ap->a_vp; struct iso_node *dp; struct iso_mnt *imp; struct buf *bp = NULL; struct iso_directory_record *ep; int entryoffsetinblock; doff_t endsearch; u_long bmask; int error = 0; int reclen; u_short namelen; cdino_t ino; dp = VTOI(vdp); imp = dp->i_mnt; bmask = imp->im_bmask; idp = malloc(sizeof(*idp), M_TEMP, M_WAITOK); /* * These are passed to copyout(), so make sure there's no garbage * being leaked in padding or after short names. */ memset(&idp->saveent, 0, sizeof(idp->saveent)); memset(&idp->assocent, 0, sizeof(idp->assocent)); memset(&idp->current, 0, sizeof(idp->current)); /* * XXX * Is it worth trying to figure out the type? */ idp->saveent.d_type = idp->assocent.d_type = idp->current.d_type = DT_UNKNOWN; idp->uio = uio; idp->eofflag = 1; idp->curroff = uio->uio_offset; idp->uio_off = uio->uio_offset; if ((entryoffsetinblock = idp->curroff & bmask) && (error = cd9660_bufatoff(dp, (off_t)idp->curroff, NULL, &bp))) { free(idp, M_TEMP, 0); return (error); } endsearch = dp->i_size; while (idp->curroff < endsearch) { /* * If offset is on a block boundary, * read the next directory block. * Release previous if it exists. */ if ((idp->curroff & bmask) == 0) { if (bp != NULL) brelse(bp); error = cd9660_bufatoff(dp, (off_t)idp->curroff, NULL, &bp); if (error) break; entryoffsetinblock = 0; } /* * Get pointer to next entry. */ ep = (struct iso_directory_record *) ((char *)bp->b_data + entryoffsetinblock); reclen = isonum_711(ep->length); if (reclen == 0) { /* skip to next block, if any */ idp->curroff = (idp->curroff & ~bmask) + imp->logical_block_size; continue; } if (reclen < ISO_DIRECTORY_RECORD_SIZE) { error = EINVAL; /* illegal entry, stop */ break; } if (entryoffsetinblock + reclen > imp->logical_block_size) { error = EINVAL; /* illegal directory, so stop looking */ break; } idp->current.d_namlen = isonum_711(ep->name_len); if (reclen < ISO_DIRECTORY_RECORD_SIZE + idp->current.d_namlen) { error = EINVAL; /* illegal entry, stop */ break; } if (isonum_711(ep->flags)&2) ino = isodirino(ep, imp); else ino = dbtob(bp->b_blkno) + entryoffsetinblock; idp->curroff += reclen; switch (imp->iso_ftype) { case ISO_FTYPE_RRIP: cd9660_rrip_getname(ep,idp->current.d_name, &namelen, &ino, imp); idp->current.d_fileno = ino; idp->current.d_namlen = (u_char)namelen; if (idp->current.d_namlen) error = iso_uiodir(idp,&idp->current,idp->curroff); break; default: /* ISO_FTYPE_DEFAULT || ISO_FTYPE_9660 */ idp->current.d_fileno = ino; strlcpy(idp->current.d_name,"..", sizeof idp->current.d_name); if (idp->current.d_namlen == 1 && ep->name[0] == 0) { idp->current.d_namlen = 1; error = iso_uiodir(idp,&idp->current,idp->curroff); } else if (idp->current.d_namlen == 1 && ep->name[0] == 1) { idp->current.d_namlen = 2; error = iso_uiodir(idp,&idp->current,idp->curroff); } else { isofntrans(ep->name,idp->current.d_namlen, idp->current.d_name, &namelen, imp->iso_ftype == ISO_FTYPE_9660, isonum_711(ep->flags) & 4, imp->joliet_level); idp->current.d_namlen = (u_char)namelen; if (imp->iso_ftype == ISO_FTYPE_DEFAULT) error = iso_shipdir(idp); else error = iso_uiodir(idp,&idp->current,idp->curroff); } } if (error) break; entryoffsetinblock += reclen; } if (!error && imp->iso_ftype == ISO_FTYPE_DEFAULT) { idp->current.d_namlen = 0; error = iso_shipdir(idp); } if (error < 0) error = 0; if (bp) brelse (bp); uio->uio_offset = idp->uio_off; *ap->a_eofflag = idp->eofflag; free(idp, M_TEMP, 0); return (error); } /* * Return target name of a symbolic link * Shouldn't we get the parent vnode and read the data from there? * This could eventually result in deadlocks in cd9660_lookup. * But otherwise the block read here is in the block buffer two times. */ typedef struct iso_directory_record ISODIR; typedef struct iso_node ISONODE; typedef struct iso_mnt ISOMNT; int cd9660_readlink(void *v) { struct vop_readlink_args *ap = v; ISONODE *ip; ISODIR *dirp; ISOMNT *imp; struct buf *bp; struct uio *uio; u_short symlen; int error; char *symname; ip = VTOI(ap->a_vp); imp = ip->i_mnt; uio = ap->a_uio; if (imp->iso_ftype != ISO_FTYPE_RRIP) return (EINVAL); /* * Get parents directory record block that this inode included. */ error = bread(imp->im_devvp, (ip->i_number >> imp->im_bshift) << (imp->im_bshift - DEV_BSHIFT), imp->logical_block_size, &bp); if (error) { brelse(bp); return (EINVAL); } /* * Setup the directory pointer for this inode */ dirp = (ISODIR *)(bp->b_data + (ip->i_number & imp->im_bmask)); /* * Just make sure, we have a right one.... * 1: Check not cross boundary on block */ if ((ip->i_number & imp->im_bmask) + isonum_711(dirp->length) > imp->logical_block_size) { brelse(bp); return (EINVAL); } /* * Now get a buffer * Abuse a namei buffer for now. */ if (uio->uio_segflg == UIO_SYSSPACE && uio->uio_iov->iov_len >= MAXPATHLEN) symname = uio->uio_iov->iov_base; else symname = pool_get(&namei_pool, PR_WAITOK); /* * Ok, we just gathering a symbolic name in SL record. */ if (cd9660_rrip_getsymname(dirp, symname, &symlen, imp) == 0) { if (uio->uio_segflg != UIO_SYSSPACE || uio->uio_iov->iov_len < MAXPATHLEN) pool_put(&namei_pool, symname); brelse(bp); return (EINVAL); } /* * Don't forget before you leave from home ;-) */ brelse(bp); /* * return with the symbolic name to caller's. */ if (uio->uio_segflg != UIO_SYSSPACE || uio->uio_iov->iov_len < MAXPATHLEN) { error = uiomove(symname, symlen, uio); pool_put(&namei_pool, symname); return (error); } uio->uio_resid -= symlen; uio->uio_iov->iov_base = (char *)uio->uio_iov->iov_base + symlen; uio->uio_iov->iov_len -= symlen; return (0); } int cd9660_link(void *v) { struct vop_link_args *ap = v; VOP_ABORTOP(ap->a_dvp, ap->a_cnp); vput(ap->a_dvp); return (EROFS); } int cd9660_symlink(void *v) { struct vop_symlink_args *ap = v; VOP_ABORTOP(ap->a_dvp, ap->a_cnp); vput(ap->a_dvp); return (EROFS); } /* * Lock an inode. */ int cd9660_lock(void *v) { struct vop_lock_args *ap = v; struct vnode *vp = ap->a_vp; return rrw_enter(&VTOI(vp)->i_lock, ap->a_flags & LK_RWFLAGS); } /* * Unlock an inode. */ int cd9660_unlock(void *v) { struct vop_unlock_args *ap = v; struct vnode *vp = ap->a_vp; rrw_exit(&VTOI(vp)->i_lock); return 0; } /* * Calculate the logical to physical mapping if not done already, * then call the device strategy routine. */ int cd9660_strategy(void *v) { struct vop_strategy_args *ap = v; struct buf *bp = ap->a_bp; struct vnode *vp = bp->b_vp; struct iso_node *ip; int error; int s; ip = VTOI(vp); if (vp->v_type == VBLK || vp->v_type == VCHR) panic("cd9660_strategy: spec"); if (bp->b_blkno == bp->b_lblkno) { error = VOP_BMAP(vp, bp->b_lblkno, NULL, &bp->b_blkno, NULL); if (error) { bp->b_error = error; bp->b_flags |= B_ERROR; s = splbio(); biodone(bp); splx(s); return (error); } if ((long)bp->b_blkno == -1) clrbuf(bp); } if ((long)bp->b_blkno == -1) { s = splbio(); biodone(bp); splx(s); return (0); } vp = ip->i_devvp; bp->b_dev = vp->v_rdev; VOP_STRATEGY(vp, bp); return (0); } /* * Print out the contents of an inode. */ /*ARGSUSED*/ int cd9660_print(void *v) { printf("tag VT_ISOFS, isofs vnode\n"); return (0); } /* * Check for a locked inode. */ int cd9660_islocked(void *v) { struct vop_islocked_args *ap = v; return rrw_status(&VTOI(ap->a_vp)->i_lock); } /* * Return POSIX pathconf information applicable to cd9660 filesystems. */ int cd9660_pathconf(void *v) { struct vop_pathconf_args *ap = v; int error = 0; switch (ap->a_name) { case _PC_LINK_MAX: *ap->a_retval = 1; break; case _PC_NAME_MAX: if (VTOI(ap->a_vp)->i_mnt->iso_ftype == ISO_FTYPE_RRIP) *ap->a_retval = NAME_MAX; else *ap->a_retval = 37; break; case _PC_CHOWN_RESTRICTED: *ap->a_retval = 1; break; case _PC_NO_TRUNC: *ap->a_retval = 1; break; case _PC_TIMESTAMP_RESOLUTION: *ap->a_retval = 1000000000; /* one billion nanoseconds */ break; default: error = EINVAL; break; } return (error); } /* * Global vfs data structures for isofs */ /* Global vfs data structures for cd9660. */ const struct vops cd9660_vops = { .vop_lookup = cd9660_lookup, .vop_create = eopnotsupp, .vop_mknod = eopnotsupp, .vop_open = cd9660_open, .vop_close = cd9660_close, .vop_access = cd9660_access, .vop_getattr = cd9660_getattr, .vop_setattr = cd9660_setattr, .vop_read = cd9660_read, .vop_write = eopnotsupp, .vop_ioctl = cd9660_ioctl, .vop_kqfilter = cd9660_kqfilter, .vop_revoke = vop_generic_revoke, .vop_fsync = nullop, .vop_remove = eopnotsupp, .vop_link = cd9660_link, .vop_rename = eopnotsupp, .vop_mkdir = eopnotsupp, .vop_rmdir = eopnotsupp, .vop_symlink = cd9660_symlink, .vop_readdir = cd9660_readdir, .vop_readlink = cd9660_readlink, .vop_abortop = vop_generic_abortop, .vop_inactive = cd9660_inactive, .vop_reclaim = cd9660_reclaim, .vop_lock = cd9660_lock, .vop_unlock = cd9660_unlock, .vop_bmap = cd9660_bmap, .vop_strategy = cd9660_strategy, .vop_print = cd9660_print, .vop_islocked = cd9660_islocked, .vop_pathconf = cd9660_pathconf, .vop_advlock = eopnotsupp, .vop_bwrite = vop_generic_bwrite, }; /* Special device vnode ops */ const struct vops cd9660_specvops = { .vop_access = cd9660_access, .vop_getattr = cd9660_getattr, .vop_setattr = cd9660_setattr, .vop_inactive = cd9660_inactive, .vop_reclaim = cd9660_reclaim, .vop_lock = cd9660_lock, .vop_unlock = cd9660_unlock, .vop_print = cd9660_print, .vop_islocked = cd9660_islocked, /* XXX: Keep in sync with spec_vops. */ .vop_lookup = vop_generic_lookup, .vop_create = vop_generic_badop, .vop_mknod = vop_generic_badop, .vop_open = spec_open, .vop_close = spec_close, .vop_read = spec_read, .vop_write = spec_write, .vop_ioctl = spec_ioctl, .vop_kqfilter = spec_kqfilter, .vop_revoke = vop_generic_revoke, .vop_fsync = spec_fsync, .vop_remove = vop_generic_badop, .vop_link = vop_generic_badop, .vop_rename = vop_generic_badop, .vop_mkdir = vop_generic_badop, .vop_rmdir = vop_generic_badop, .vop_symlink = vop_generic_badop, .vop_readdir = vop_generic_badop, .vop_readlink = vop_generic_badop, .vop_abortop = vop_generic_badop, .vop_bmap = vop_generic_bmap, .vop_strategy = spec_strategy, .vop_pathconf = spec_pathconf, .vop_advlock = spec_advlock, .vop_bwrite = vop_generic_bwrite, }; #ifdef FIFO const struct vops cd9660_fifovops = { .vop_access = cd9660_access, .vop_getattr = cd9660_getattr, .vop_setattr = cd9660_setattr, .vop_inactive = cd9660_inactive, .vop_reclaim = cd9660_reclaim, .vop_lock = cd9660_lock, .vop_unlock = cd9660_unlock, .vop_print = cd9660_print, .vop_islocked = cd9660_islocked, .vop_bwrite = vop_generic_bwrite, /* XXX: Keep in sync with fifo_vops. */ .vop_lookup = vop_generic_lookup, .vop_create = vop_generic_badop, .vop_mknod = vop_generic_badop, .vop_open = fifo_open, .vop_close = fifo_close, .vop_read = fifo_read, .vop_write = fifo_write, .vop_ioctl = fifo_ioctl, .vop_kqfilter = fifo_kqfilter, .vop_revoke = vop_generic_revoke, .vop_fsync = nullop, .vop_remove = vop_generic_badop, .vop_link = vop_generic_badop, .vop_rename = vop_generic_badop, .vop_mkdir = vop_generic_badop, .vop_rmdir = vop_generic_badop, .vop_symlink = vop_generic_badop, .vop_readdir = vop_generic_badop, .vop_readlink = vop_generic_badop, .vop_abortop = vop_generic_badop, .vop_bmap = vop_generic_bmap, .vop_strategy = vop_generic_badop, .vop_pathconf = fifo_pathconf, .vop_advlock = fifo_advlock, }; #endif /* FIFO */ void filt_cd9660detach(struct knote *kn); int filt_cd9660read(struct knote *kn, long hint); int filt_cd9660write(struct knote *kn, long hint); int filt_cd9660vnode(struct knote *kn, long hint); const struct filterops cd9660read_filtops = { .f_flags = FILTEROP_ISFD, .f_attach = NULL, .f_detach = filt_cd9660detach, .f_event = filt_cd9660read, }; const struct filterops cd9660write_filtops = { .f_flags = FILTEROP_ISFD, .f_attach = NULL, .f_detach = filt_cd9660detach, .f_event = filt_cd9660write, }; const struct filterops cd9660vnode_filtops = { .f_flags = FILTEROP_ISFD, .f_attach = NULL, .f_detach = filt_cd9660detach, .f_event = filt_cd9660vnode, }; int cd9660_kqfilter(void *v) { struct vop_kqfilter_args *ap = v; struct vnode *vp = ap->a_vp; struct knote *kn = ap->a_kn; switch (kn->kn_filter) { case EVFILT_READ: kn->kn_fop = &cd9660read_filtops; break; case EVFILT_WRITE: kn->kn_fop = &cd9660write_filtops; break; case EVFILT_VNODE: kn->kn_fop = &cd9660vnode_filtops; break; default: return (EINVAL); } kn->kn_hook = (caddr_t)vp; klist_insert_locked(&vp->v_selectinfo.si_note, kn); return (0); } void filt_cd9660detach(struct knote *kn) { struct vnode *vp = (struct vnode *)kn->kn_hook; klist_remove_locked(&vp->v_selectinfo.si_note, kn); } int filt_cd9660read(struct knote *kn, long hint) { struct vnode *vp = (struct vnode *)kn->kn_hook; struct iso_node *node = VTOI(vp); /* * filesystem is gone, so set the EOF flag and schedule * the knote for deletion. */ if (hint == NOTE_REVOKE) { kn->kn_flags |= (EV_EOF | EV_ONESHOT); return (1); } kn->kn_data = node->i_size - foffset(kn->kn_fp); if (kn->kn_data == 0 && kn->kn_sfflags & NOTE_EOF) { kn->kn_fflags |= NOTE_EOF; return (1); } if (kn->kn_flags & (__EV_POLL | __EV_SELECT)) return (1); return (kn->kn_data != 0); } int filt_cd9660write(struct knote *kn, long hint) { /* * filesystem is gone, so set the EOF flag and schedule * the knote for deletion. */ if (hint == NOTE_REVOKE) { kn->kn_flags |= (EV_EOF | EV_ONESHOT); return (1); } kn->kn_data = 0; return (1); } int filt_cd9660vnode(struct knote *kn, long hint) { if (kn->kn_sfflags & hint) kn->kn_fflags |= hint; if (hint == NOTE_REVOKE) { kn->kn_flags |= EV_EOF; return (1); } return (kn->kn_fflags != 0); }