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5 * This code is derived from software contributed to Berkeley
6 * by Pace Willisson (pace@blitz.com). The Rock Ridge Extension
7 * Support code is derived from software contributed to Berkeley
8 * by Atsushi Murai (amurai@spec.co.jp).
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38 * @(#)cd9660_vnops.c 8.19 (Berkeley) 5/27/95
39 * $FreeBSD: src/sys/isofs/cd9660/cd9660_vnops.c,v 1.62 1999/12/15 23:01:51 eivind Exp $
40 * $DragonFly: src/sys/vfs/isofs/cd9660/cd9660_vnops.c,v 1.27 2006/06/01 06:10:56 dillon Exp $
43 #include <sys/param.h>
44 #include <sys/systm.h>
46 #include <sys/namei.h>
47 #include <sys/kernel.h>
50 #include <sys/mount.h>
51 #include <sys/vnode.h>
52 #include <vfs/fifofs/fifo.h>
53 #include <sys/malloc.h>
54 #include <sys/dirent.h>
55 #include <sys/unistd.h>
56 #include <sys/filio.h>
57 #include <sys/lockf.h>
58 #include <sys/objcache.h>
61 #include <vm/vnode_pager.h>
64 #include "cd9660_node.h"
67 static int cd9660_access (struct vop_access_args *);
68 static int cd9660_advlock (struct vop_advlock_args *);
69 static int cd9660_getattr (struct vop_getattr_args *);
70 static int cd9660_ioctl (struct vop_ioctl_args *);
71 static int cd9660_pathconf (struct vop_pathconf_args *);
72 static int cd9660_open (struct vop_open_args *);
73 static int cd9660_read (struct vop_read_args *);
74 static int cd9660_setattr (struct vop_setattr_args *);
76 static int iso_uiodir (struct isoreaddir *idp, struct dirent *dp,
78 static int iso_shipdir (struct isoreaddir *idp);
79 static int cd9660_readdir (struct vop_readdir_args *);
80 static int cd9660_readlink (struct vop_readlink_args *ap);
81 static int cd9660_strategy (struct vop_strategy_args *);
82 static int cd9660_print (struct vop_print_args *);
83 static int cd9660_getpages (struct vop_getpages_args *);
84 static int cd9660_putpages (struct vop_putpages_args *);
87 * Setattr call. Only allowed for block and character special devices.
89 * cd9660_setattr(struct vnodeop_desc *a_desc, struct vnode *a_vp,
90 * struct vattr *a_vap, struct ucred *a_cred, struct proc *a_p)
93 cd9660_setattr(struct vop_setattr_args *ap)
95 struct vnode *vp = ap->a_vp;
96 struct vattr *vap = ap->a_vap;
98 if (vap->va_flags != (u_long)VNOVAL || vap->va_uid != (uid_t)VNOVAL ||
99 vap->va_gid != (gid_t)VNOVAL || vap->va_atime.tv_sec != VNOVAL ||
100 vap->va_mtime.tv_sec != VNOVAL || vap->va_mode != (mode_t)VNOVAL)
102 if (vap->va_size != (u_quad_t)VNOVAL) {
103 switch (vp->v_type) {
122 * Check mode permission on inode pointer. Mode is READ, WRITE or EXEC.
123 * The mode is shifted to select the owner/group/other fields. The
124 * super user is granted all permissions.
126 * cd9660_access(struct vnode *a_vp, int a_mode, struct ucred *a_cred,
131 cd9660_access(struct vop_access_args *ap)
133 struct vnode *vp = ap->a_vp;
134 struct iso_node *ip = VTOI(vp);
135 struct ucred *cred = ap->a_cred;
136 mode_t mask, mode = ap->a_mode;
141 * Disallow write attempts unless the file is a socket,
142 * fifo, or a block or character device resident on the
146 switch (vp->v_type) {
157 /* User id 0 always gets access. */
158 if (cred->cr_uid == 0)
163 /* Otherwise, check the owner. */
164 if (cred->cr_uid == ip->inode.iso_uid) {
171 return ((ip->inode.iso_mode & mask) == mask ? 0 : EACCES);
174 /* Otherwise, check the groups. */
175 for (i = 0, gp = cred->cr_groups; i < cred->cr_ngroups; i++, gp++)
176 if (ip->inode.iso_gid == *gp) {
183 return ((ip->inode.iso_mode & mask) == mask ?
187 /* Otherwise, check everyone else. */
194 return ((ip->inode.iso_mode & mask) == mask ? 0 : EACCES);
198 * cd9660_getattr(struct vnode *a_vp, struct vattr *a_vap, struct thread *a_td)
201 cd9660_getattr(struct vop_getattr_args *ap)
203 struct vnode *vp = ap->a_vp;
204 struct vattr *vap = ap->a_vap;
205 struct iso_node *ip = VTOI(vp);
207 vap->va_fsid = dev2udev(ip->i_dev);
208 vap->va_fileid = ip->i_number;
210 vap->va_mode = ip->inode.iso_mode;
211 vap->va_nlink = ip->inode.iso_links;
212 vap->va_uid = ip->inode.iso_uid;
213 vap->va_gid = ip->inode.iso_gid;
214 vap->va_atime = ip->inode.iso_atime;
215 vap->va_mtime = ip->inode.iso_mtime;
216 vap->va_ctime = ip->inode.iso_ctime;
217 vap->va_rdev = ip->inode.iso_rdev;
219 vap->va_size = (u_quad_t)(unsigned long)ip->i_size;
220 if (ip->i_size == 0 && (vap->va_mode & S_IFMT) == S_IFLNK) {
221 struct vop_readlink_args rdlnk;
226 MALLOC(cp, char *, MAXPATHLEN, M_TEMP, M_WAITOK);
228 aiov.iov_len = MAXPATHLEN;
229 auio.uio_iov = &aiov;
232 auio.uio_rw = UIO_READ;
233 auio.uio_segflg = UIO_SYSSPACE;
234 auio.uio_td = curthread;
235 auio.uio_resid = MAXPATHLEN;
237 rdlnk.a_vp = ap->a_vp;
238 rdlnk.a_cred = proc0.p_ucred; /* use root cred */
239 if (cd9660_readlink(&rdlnk) == 0)
240 vap->va_size = MAXPATHLEN - auio.uio_resid;
245 vap->va_blocksize = ip->i_mnt->logical_block_size;
246 vap->va_bytes = (u_quad_t) ip->i_size;
247 vap->va_type = vp->v_type;
253 * Vnode op for ioctl.
255 * cd9660_ioctl(struct vnode *a_vp, int a_command, caddr_t a_data,
256 * int a_fflag, struct ucred *a_cred, struct proc *a_p)
259 cd9660_ioctl(struct vop_ioctl_args *ap)
261 struct vnode *vp = ap->a_vp;
262 struct iso_node *ip = VTOI(vp);
264 switch (ap->a_command) {
267 *(int *)(ap->a_data) = ip->iso_start;
275 * open is called when the kernel intends to read or memory map a vnode.
278 cd9660_open(struct vop_open_args *ap)
280 return(vop_stdopen(ap));
284 * Vnode op for reading.
286 * cd9660_read(struct vnode *a_vp, struct uio *a_uio, int a_ioflag,
287 * struct ucred *a_cred)
290 cd9660_read(struct vop_read_args *ap)
292 struct vnode *vp = ap->a_vp;
293 struct uio *uio = ap->a_uio;
294 struct iso_node *ip = VTOI(vp);
297 daddr_t lbn, rablock;
301 int rasize, error = 0;
305 seqcount = ap->a_ioflag >> 16;
307 if (uio->uio_resid == 0)
309 if (uio->uio_offset < 0)
311 ip->i_flag |= IN_ACCESS;
314 lbn = lblkno(imp, uio->uio_offset);
315 loffset = lblktooff(imp, lbn);
316 on = blkoff(imp, uio->uio_offset);
317 n = min((u_int)(imp->logical_block_size - on),
319 diff = (off_t)ip->i_size - uio->uio_offset;
324 size = blksize(imp, ip, lbn);
326 raoffset = lblktooff(imp, rablock);
327 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERR) == 0) {
328 if (raoffset < ip->i_size)
329 error = cluster_read(vp, (off_t)ip->i_size,
332 (ap->a_ioflag >> 16), &bp);
334 error = bread(vp, loffset, size, &bp);
337 lblktosize(imp, rablock) < ip->i_size) {
338 rasize = blksize(imp, ip, rablock);
339 error = breadn(vp, loffset, size, &raoffset,
342 error = bread(vp, loffset, size, &bp);
344 n = min(n, size - bp->b_resid);
350 error = uiomove(bp->b_data + on, (int)n, uio);
352 } while (error == 0 && uio->uio_resid > 0 && n != 0);
356 /* struct dirent + enough space for the maximum supported size */
359 char de_name[_DIRENT_RECLEN(NAME_MAX) - sizeof(struct dirent)];
363 * Structure for reading directories
366 struct iso_dirent saveent;
367 struct iso_dirent assocent;
368 struct iso_dirent current;
380 iso_uiodir(struct isoreaddir *idp, struct dirent *dp, off_t off)
384 dp->d_name[dp->d_namlen] = 0;
386 if (idp->uio->uio_resid < _DIRENT_DIRSIZ(dp)) {
392 if (idp->ncookies <= 0) {
397 *idp->cookies++ = off;
401 if ((error = uiomove((caddr_t) dp,_DIRENT_DIRSIZ(dp),idp->uio)) != 0)
408 iso_shipdir(struct isoreaddir *idp)
415 cl = idp->current.de.d_namlen;
416 cname = idp->current.de.d_name;
417 assoc = (cl > 1) && (*cname == ASSOCCHAR);
423 dp = &idp->saveent.de;
425 if (!(sl = dp->d_namlen)) {
426 dp = &idp->assocent.de;
427 sname = dp->d_name + 1;
428 sl = dp->d_namlen - 1;
432 || bcmp(sname,cname,sl)) {
433 if (idp->assocent.de.d_namlen) {
434 if ((error = iso_uiodir(idp,&idp->assocent.de,idp->assocoff)) != 0)
436 idp->assocent.de.d_namlen = 0;
438 if (idp->saveent.de.d_namlen) {
439 if ((error = iso_uiodir(idp,&idp->saveent.de,idp->saveoff)) != 0)
441 idp->saveent.de.d_namlen = 0;
446 idp->assocoff = idp->curroff;
447 bcopy(&idp->current,&idp->assocent,_DIRENT_DIRSIZ(&idp->current.de));
449 idp->saveoff = idp->curroff;
450 bcopy(&idp->current,&idp->saveent,_DIRENT_DIRSIZ(&idp->current.de));
456 * Vnode op for readdir
458 * cd9660_readdir(struct vnode *a_vp, struct uio *a_uio, struct ucred *a_cred,
459 * int *a_eofflag, int *a_ncookies, u_long *a_cookies)
462 cd9660_readdir(struct vop_readdir_args *ap)
464 struct uio *uio = ap->a_uio;
465 struct isoreaddir *idp;
466 struct vnode *vdp = ap->a_vp;
469 struct buf *bp = NULL;
470 struct iso_directory_record *ep;
471 int entryoffsetinblock;
478 u_long *cookies = NULL;
482 bmask = imp->im_bmask;
484 MALLOC(idp, struct isoreaddir *, sizeof(*idp), M_TEMP, M_WAITOK);
485 idp->saveent.de.d_namlen = idp->assocent.de.d_namlen = 0;
488 * Is it worth trying to figure out the type?
490 idp->saveent.de.d_type = DT_UNKNOWN;
491 idp->assocent.de.d_type = DT_UNKNOWN;
492 idp->current.de.d_type = DT_UNKNOWN;
494 if (ap->a_ncookies == NULL) {
498 * Guess the number of cookies needed. Guess at least
499 * 1 to avoid a degenerate case in malloc, and cap at
500 * a reasonable limit.
502 ncookies = uio->uio_resid / 16 + 1;
505 MALLOC(cookies, u_long *, ncookies * sizeof(u_int),
507 idp->cookies = cookies;
508 idp->ncookies = ncookies;
511 idp->curroff = uio->uio_offset;
513 if ((entryoffsetinblock = idp->curroff & bmask) &&
514 (error = cd9660_devblkatoff(vdp, (off_t)idp->curroff, NULL, &bp))) {
518 endsearch = dp->i_size;
520 while (idp->curroff < endsearch) {
522 * If offset is on a block boundary,
523 * read the next directory block.
524 * Release previous if it exists.
526 if ((idp->curroff & bmask) == 0) {
530 cd9660_devblkatoff(vdp, (off_t)idp->curroff, NULL, &bp)) != 0)
532 entryoffsetinblock = 0;
535 * Get pointer to next entry.
537 ep = (struct iso_directory_record *)
538 ((char *)bp->b_data + entryoffsetinblock);
540 reclen = isonum_711(ep->length);
542 /* skip to next block, if any */
544 (idp->curroff & ~bmask) + imp->logical_block_size;
548 if (reclen < ISO_DIRECTORY_RECORD_SIZE) {
550 /* illegal entry, stop */
554 if (entryoffsetinblock + reclen > imp->logical_block_size) {
556 /* illegal directory, so stop looking */
560 idp->current.de.d_namlen = isonum_711(ep->name_len);
562 if (reclen < ISO_DIRECTORY_RECORD_SIZE + idp->current.de.d_namlen) {
564 /* illegal entry, stop */
568 if (isonum_711(ep->flags)&2)
569 idp->current.de.d_ino = isodirino(ep, imp);
571 idp->current.de.d_ino = bp->b_bio1.bio_offset +
574 idp->curroff += reclen;
576 switch (imp->iso_ftype) {
579 ino_t cur_fileno = idp->current.de.d_ino;
580 cd9660_rrip_getname(ep,idp->current.de.d_name, &namelen,
582 idp->current.de.d_ino = cur_fileno;
583 idp->current.de.d_namlen = namelen;
584 if (idp->current.de.d_namlen)
585 error = iso_uiodir(idp,&idp->current.de,idp->curroff);
588 default: /* ISO_FTYPE_DEFAULT || ISO_FTYPE_9660 || ISO_FTYPE_HIGH_SIERRA*/
589 strcpy(idp->current.de.d_name,"..");
590 if (idp->current.de.d_namlen == 1 && ep->name[0] == 0) {
591 idp->current.de.d_namlen = 1;
592 error = iso_uiodir(idp,&idp->current.de,idp->curroff);
593 } else if (idp->current.de.d_namlen == 1 && ep->name[0] == 1) {
594 idp->current.de.d_namlen = 2;
595 error = iso_uiodir(idp,&idp->current.de,idp->curroff);
597 isofntrans(ep->name,idp->current.de.d_namlen,
598 idp->current.de.d_name, &namelen,
599 imp->iso_ftype == ISO_FTYPE_9660,
600 isonum_711(ep->flags)&4,
602 idp->current.de.d_namlen = namelen;
603 if (imp->iso_ftype == ISO_FTYPE_DEFAULT)
604 error = iso_shipdir(idp);
606 error = iso_uiodir(idp,&idp->current.de,idp->curroff);
612 entryoffsetinblock += reclen;
615 if (!error && imp->iso_ftype == ISO_FTYPE_DEFAULT) {
616 idp->current.de.d_namlen = 0;
617 error = iso_shipdir(idp);
622 if (ap->a_ncookies != NULL) {
624 free(cookies, M_TEMP);
627 * Work out the number of cookies actually used.
629 *ap->a_ncookies = ncookies - idp->ncookies;
630 *ap->a_cookies = cookies;
637 uio->uio_offset = idp->uio_off;
638 *ap->a_eofflag = idp->eofflag;
646 * Return target name of a symbolic link
647 * Shouldn't we get the parent vnode and read the data from there?
648 * This could eventually result in deadlocks in cd9660_lookup.
649 * But otherwise the block read here is in the block buffer two times.
651 typedef struct iso_directory_record ISODIR;
652 typedef struct iso_node ISONODE;
653 typedef struct iso_mnt ISOMNT;
655 * cd9660_readlink(struct vnode *a_vp, struct uio *a_uio, struct ucred *a_cred)
658 cd9660_readlink(struct vop_readlink_args *ap)
673 if (imp->iso_ftype != ISO_FTYPE_RRIP)
677 * Get parents directory record block that this inode included.
679 error = bread(imp->im_devvp,
680 (off_t)ip->i_number & ~((1 << imp->im_bshift) - 1),
681 imp->logical_block_size, &bp);
688 * Setup the directory pointer for this inode
690 dirp = (ISODIR *)(bp->b_data + (ip->i_number & imp->im_bmask));
693 * Just make sure, we have a right one....
694 * 1: Check not cross boundary on block
696 if ((ip->i_number & imp->im_bmask) + isonum_711(dirp->length)
697 > (unsigned)imp->logical_block_size) {
704 * Abuse a namei buffer for now.
706 if (uio->uio_segflg == UIO_SYSSPACE)
707 symname = uio->uio_iov->iov_base;
709 symname = objcache_get(namei_oc, M_WAITOK);
712 * Ok, we just gathering a symbolic name in SL record.
714 if (cd9660_rrip_getsymname(dirp, symname, &symlen, imp) == 0) {
715 if (uio->uio_segflg != UIO_SYSSPACE)
716 objcache_put(namei_oc, symname);
721 * Don't forget before you leave from home ;-)
726 * return with the symbolic name to caller's.
728 if (uio->uio_segflg != UIO_SYSSPACE) {
729 error = uiomove(symname, symlen, uio);
730 objcache_put(namei_oc, symname);
733 uio->uio_resid -= symlen;
734 uio->uio_iov->iov_base += symlen;
735 uio->uio_iov->iov_len -= symlen;
740 * Calculate the logical to physical mapping if not done already,
741 * then call the device strategy routine.
743 * cd9660_strategy(struct buf *a_vp, struct buf *a_bio)
746 cd9660_strategy(struct vop_strategy_args *ap)
748 struct bio *bio = ap->a_bio;
750 struct buf *bp = bio->bio_buf;
751 struct vnode *vp = ap->a_vp;
756 if (vp->v_type == VBLK || vp->v_type == VCHR)
757 panic("cd9660_strategy: spec");
758 nbio = push_bio(bio);
759 if (nbio->bio_offset == NOOFFSET) {
760 error = VOP_BMAP(vp, bio->bio_offset, NULL,
761 &nbio->bio_offset, NULL, NULL);
764 bp->b_flags |= B_ERROR;
765 /* I/O was never started on nbio, must biodone(bio) */
769 if (nbio->bio_offset == NOOFFSET)
772 if (nbio->bio_offset == NOOFFSET) {
773 /* I/O was never started on nbio, must biodone(bio) */
778 vn_strategy(vp, nbio);
783 * Print out the contents of an inode.
785 * cd9660_print(struct vnode *a_vp)
788 cd9660_print(struct vop_print_args *ap)
790 printf("tag VT_ISOFS, isofs vnode\n");
795 * Return POSIX pathconf information applicable to cd9660 filesystems.
797 * cd9660_pathconf(struct vnode *a_vp, int a_name, register_t *a_retval)
800 cd9660_pathconf(struct vop_pathconf_args *ap)
802 switch (ap->a_name) {
807 if (VTOI(ap->a_vp)->i_mnt->iso_ftype == ISO_FTYPE_RRIP)
808 *ap->a_retval = NAME_MAX;
813 *ap->a_retval = PATH_MAX;
816 *ap->a_retval = PIPE_BUF;
818 case _PC_CHOWN_RESTRICTED:
833 * XXX By default, wimp out... note that a_offset is ignored (and always
837 cd9660_getpages(struct vop_getpages_args *ap)
839 return vnode_pager_generic_getpages(ap->a_vp, ap->a_m, ap->a_count,
846 * XXX By default, wimp out... note that a_offset is ignored (and always
850 cd9660_putpages(struct vop_putpages_args *ap)
852 return vnode_pager_generic_putpages(ap->a_vp, ap->a_m, ap->a_count,
853 ap->a_sync, ap->a_rtvals);
857 * Advisory lock support
860 cd9660_advlock(struct vop_advlock_args *ap)
862 struct iso_node *ip = VTOI(ap->a_vp);
863 return (lf_advlock(ap, &(ip->i_lockf), ip->i_size));
868 * Global vfs data structures for cd9660
870 struct vnodeopv_entry_desc cd9660_vnodeop_entries[] = {
871 { &vop_default_desc, (vnodeopv_entry_t) vop_defaultop },
872 { &vop_open_desc, (vnodeopv_entry_t) cd9660_open},
873 { &vop_access_desc, (vnodeopv_entry_t) cd9660_access },
874 { &vop_advlock_desc, (vnodeopv_entry_t) cd9660_advlock },
875 { &vop_bmap_desc, (vnodeopv_entry_t) cd9660_bmap },
876 { &vop_old_lookup_desc, (vnodeopv_entry_t) cd9660_lookup },
877 { &vop_getattr_desc, (vnodeopv_entry_t) cd9660_getattr },
878 { &vop_inactive_desc, (vnodeopv_entry_t) cd9660_inactive },
879 { &vop_ioctl_desc, (vnodeopv_entry_t) cd9660_ioctl },
880 { &vop_islocked_desc, (vnodeopv_entry_t) vop_stdislocked },
881 { &vop_lock_desc, (vnodeopv_entry_t) vop_stdlock },
882 { &vop_pathconf_desc, (vnodeopv_entry_t) cd9660_pathconf },
883 { &vop_print_desc, (vnodeopv_entry_t) cd9660_print },
884 { &vop_read_desc, (vnodeopv_entry_t) cd9660_read },
885 { &vop_readdir_desc, (vnodeopv_entry_t) cd9660_readdir },
886 { &vop_readlink_desc, (vnodeopv_entry_t) cd9660_readlink },
887 { &vop_reclaim_desc, (vnodeopv_entry_t) cd9660_reclaim },
888 { &vop_setattr_desc, (vnodeopv_entry_t) cd9660_setattr },
889 { &vop_strategy_desc, (vnodeopv_entry_t) cd9660_strategy },
890 { &vop_unlock_desc, (vnodeopv_entry_t) vop_stdunlock },
891 { &vop_getpages_desc, (vnodeopv_entry_t) cd9660_getpages },
892 { &vop_putpages_desc, (vnodeopv_entry_t) cd9660_putpages },
897 * Special device vnode ops
899 struct vnodeopv_entry_desc cd9660_specop_entries[] = {
900 { &vop_default_desc, (vnodeopv_entry_t) spec_vnoperate },
901 { &vop_access_desc, (vnodeopv_entry_t) cd9660_access },
902 { &vop_getattr_desc, (vnodeopv_entry_t) cd9660_getattr },
903 { &vop_inactive_desc, (vnodeopv_entry_t) cd9660_inactive },
904 { &vop_islocked_desc, (vnodeopv_entry_t) vop_stdislocked },
905 { &vop_lock_desc, (vnodeopv_entry_t) vop_stdlock },
906 { &vop_print_desc, (vnodeopv_entry_t) cd9660_print },
907 { &vop_reclaim_desc, (vnodeopv_entry_t) cd9660_reclaim },
908 { &vop_setattr_desc, (vnodeopv_entry_t) cd9660_setattr },
909 { &vop_unlock_desc, (vnodeopv_entry_t) vop_stdunlock },
913 struct vnodeopv_entry_desc cd9660_fifoop_entries[] = {
914 { &vop_default_desc, (vnodeopv_entry_t) fifo_vnoperate },
915 { &vop_access_desc, (vnodeopv_entry_t) cd9660_access },
916 { &vop_getattr_desc, (vnodeopv_entry_t) cd9660_getattr },
917 { &vop_inactive_desc, (vnodeopv_entry_t) cd9660_inactive },
918 { &vop_islocked_desc, (vnodeopv_entry_t) vop_stdislocked },
919 { &vop_lock_desc, (vnodeopv_entry_t) vop_stdlock },
920 { &vop_print_desc, (vnodeopv_entry_t) cd9660_print },
921 { &vop_reclaim_desc, (vnodeopv_entry_t) cd9660_reclaim },
922 { &vop_setattr_desc, (vnodeopv_entry_t) cd9660_setattr },
923 { &vop_unlock_desc, (vnodeopv_entry_t) vop_stdunlock },