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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 1.21 2006/03/29 18:44:55 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>
60 #include <vm/vm_zone.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 = ap->a_td;
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 struct vnode *vp = ap->a_vp;
283 * Both regular file and directory operations use the buffer cache.
285 if (vp->v_type == VREG || vp->v_type == VDIR)
291 * Vnode op for reading.
293 * cd9660_read(struct vnode *a_vp, struct uio *a_uio, int a_ioflag,
294 * struct ucred *a_cred)
297 cd9660_read(struct vop_read_args *ap)
299 struct vnode *vp = ap->a_vp;
300 struct uio *uio = ap->a_uio;
301 struct iso_node *ip = VTOI(vp);
304 daddr_t lbn, rablock;
308 int rasize, error = 0;
312 seqcount = ap->a_ioflag >> 16;
314 if (uio->uio_resid == 0)
316 if (uio->uio_offset < 0)
318 ip->i_flag |= IN_ACCESS;
321 lbn = lblkno(imp, uio->uio_offset);
322 loffset = lblktooff(imp, lbn);
323 on = blkoff(imp, uio->uio_offset);
324 n = min((u_int)(imp->logical_block_size - on),
326 diff = (off_t)ip->i_size - uio->uio_offset;
331 size = blksize(imp, ip, lbn);
333 raoffset = lblktooff(imp, rablock);
334 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERR) == 0) {
335 if (raoffset < ip->i_size)
336 error = cluster_read(vp, (off_t)ip->i_size,
339 (ap->a_ioflag >> 16), &bp);
341 error = bread(vp, loffset, size, &bp);
344 lblktosize(imp, rablock) < ip->i_size) {
345 rasize = blksize(imp, ip, rablock);
346 error = breadn(vp, loffset, size, &raoffset,
349 error = bread(vp, loffset, size, &bp);
351 n = min(n, size - bp->b_resid);
357 error = uiomove(bp->b_data + on, (int)n, uio);
359 } while (error == 0 && uio->uio_resid > 0 && n != 0);
363 /* struct dirent + enough space for the maximum supported size */
366 char de_name[_DIRENT_RECLEN(NAME_MAX) - sizeof(struct dirent)];
370 * Structure for reading directories
373 struct iso_dirent saveent;
374 struct iso_dirent assocent;
375 struct iso_dirent current;
387 iso_uiodir(struct isoreaddir *idp, struct dirent *dp, off_t off)
391 dp->d_name[dp->d_namlen] = 0;
393 if (idp->uio->uio_resid < _DIRENT_DIRSIZ(dp)) {
399 if (idp->ncookies <= 0) {
404 *idp->cookies++ = off;
408 if ((error = uiomove((caddr_t) dp,_DIRENT_DIRSIZ(dp),idp->uio)) != 0)
415 iso_shipdir(struct isoreaddir *idp)
422 cl = idp->current.de.d_namlen;
423 cname = idp->current.de.d_name;
424 assoc = (cl > 1) && (*cname == ASSOCCHAR);
430 dp = &idp->saveent.de;
432 if (!(sl = dp->d_namlen)) {
433 dp = &idp->assocent.de;
434 sname = dp->d_name + 1;
435 sl = dp->d_namlen - 1;
439 || bcmp(sname,cname,sl)) {
440 if (idp->assocent.de.d_namlen) {
441 if ((error = iso_uiodir(idp,&idp->assocent.de,idp->assocoff)) != 0)
443 idp->assocent.de.d_namlen = 0;
445 if (idp->saveent.de.d_namlen) {
446 if ((error = iso_uiodir(idp,&idp->saveent.de,idp->saveoff)) != 0)
448 idp->saveent.de.d_namlen = 0;
453 idp->assocoff = idp->curroff;
454 bcopy(&idp->current,&idp->assocent,_DIRENT_DIRSIZ(&idp->current.de));
456 idp->saveoff = idp->curroff;
457 bcopy(&idp->current,&idp->saveent,_DIRENT_DIRSIZ(&idp->current.de));
463 * Vnode op for readdir
465 * cd9660_readdir(struct vnode *a_vp, struct uio *a_uio, struct ucred *a_cred,
466 * int *a_eofflag, int *a_ncookies, u_long *a_cookies)
469 cd9660_readdir(struct vop_readdir_args *ap)
471 struct uio *uio = ap->a_uio;
472 struct isoreaddir *idp;
473 struct vnode *vdp = ap->a_vp;
476 struct buf *bp = NULL;
477 struct iso_directory_record *ep;
478 int entryoffsetinblock;
485 u_long *cookies = NULL;
489 bmask = imp->im_bmask;
491 MALLOC(idp, struct isoreaddir *, sizeof(*idp), M_TEMP, M_WAITOK);
492 idp->saveent.de.d_namlen = idp->assocent.de.d_namlen = 0;
495 * Is it worth trying to figure out the type?
497 idp->saveent.de.d_type = DT_UNKNOWN;
498 idp->assocent.de.d_type = DT_UNKNOWN;
499 idp->current.de.d_type = DT_UNKNOWN;
501 if (ap->a_ncookies == NULL) {
505 * Guess the number of cookies needed.
507 ncookies = uio->uio_resid / 16;
508 MALLOC(cookies, u_long *, ncookies * sizeof(u_int), M_TEMP,
510 idp->cookies = cookies;
511 idp->ncookies = ncookies;
514 idp->curroff = uio->uio_offset;
516 if ((entryoffsetinblock = idp->curroff & bmask) &&
517 (error = cd9660_blkatoff(vdp, (off_t)idp->curroff, NULL, &bp))) {
521 endsearch = dp->i_size;
523 while (idp->curroff < endsearch) {
525 * If offset is on a block boundary,
526 * read the next directory block.
527 * Release previous if it exists.
529 if ((idp->curroff & bmask) == 0) {
533 cd9660_blkatoff(vdp, (off_t)idp->curroff, NULL, &bp)) != 0)
535 entryoffsetinblock = 0;
538 * Get pointer to next entry.
540 ep = (struct iso_directory_record *)
541 ((char *)bp->b_data + entryoffsetinblock);
543 reclen = isonum_711(ep->length);
545 /* skip to next block, if any */
547 (idp->curroff & ~bmask) + imp->logical_block_size;
551 if (reclen < ISO_DIRECTORY_RECORD_SIZE) {
553 /* illegal entry, stop */
557 if (entryoffsetinblock + reclen > imp->logical_block_size) {
559 /* illegal directory, so stop looking */
563 idp->current.de.d_namlen = isonum_711(ep->name_len);
565 if (reclen < ISO_DIRECTORY_RECORD_SIZE + idp->current.de.d_namlen) {
567 /* illegal entry, stop */
571 if (isonum_711(ep->flags)&2)
572 idp->current.de.d_ino = isodirino(ep, imp);
574 idp->current.de.d_ino = bp->b_bio2.bio_offset +
577 idp->curroff += reclen;
579 switch (imp->iso_ftype) {
582 ino_t cur_fileno = idp->current.de.d_ino;
583 cd9660_rrip_getname(ep,idp->current.de.d_name, &namelen,
585 idp->current.de.d_ino = cur_fileno;
586 idp->current.de.d_namlen = namelen;
587 if (idp->current.de.d_namlen)
588 error = iso_uiodir(idp,&idp->current.de,idp->curroff);
591 default: /* ISO_FTYPE_DEFAULT || ISO_FTYPE_9660 || ISO_FTYPE_HIGH_SIERRA*/
592 strcpy(idp->current.de.d_name,"..");
593 if (idp->current.de.d_namlen == 1 && ep->name[0] == 0) {
594 idp->current.de.d_namlen = 1;
595 error = iso_uiodir(idp,&idp->current.de,idp->curroff);
596 } else if (idp->current.de.d_namlen == 1 && ep->name[0] == 1) {
597 idp->current.de.d_namlen = 2;
598 error = iso_uiodir(idp,&idp->current.de,idp->curroff);
600 isofntrans(ep->name,idp->current.de.d_namlen,
601 idp->current.de.d_name, &namelen,
602 imp->iso_ftype == ISO_FTYPE_9660,
603 isonum_711(ep->flags)&4,
605 idp->current.de.d_namlen = namelen;
606 if (imp->iso_ftype == ISO_FTYPE_DEFAULT)
607 error = iso_shipdir(idp);
609 error = iso_uiodir(idp,&idp->current.de,idp->curroff);
615 entryoffsetinblock += reclen;
618 if (!error && imp->iso_ftype == ISO_FTYPE_DEFAULT) {
619 idp->current.de.d_namlen = 0;
620 error = iso_shipdir(idp);
625 if (ap->a_ncookies != NULL) {
627 free(cookies, M_TEMP);
630 * Work out the number of cookies actually used.
632 *ap->a_ncookies = ncookies - idp->ncookies;
633 *ap->a_cookies = cookies;
640 uio->uio_offset = idp->uio_off;
641 *ap->a_eofflag = idp->eofflag;
649 * Return target name of a symbolic link
650 * Shouldn't we get the parent vnode and read the data from there?
651 * This could eventually result in deadlocks in cd9660_lookup.
652 * But otherwise the block read here is in the block buffer two times.
654 typedef struct iso_directory_record ISODIR;
655 typedef struct iso_node ISONODE;
656 typedef struct iso_mnt ISOMNT;
658 * cd9660_readlink(struct vnode *a_vp, struct uio *a_uio, struct ucred *a_cred)
661 cd9660_readlink(struct vop_readlink_args *ap)
676 if (imp->iso_ftype != ISO_FTYPE_RRIP)
680 * Get parents directory record block that this inode included.
682 error = bread(imp->im_devvp,
683 (off_t)ip->i_number & ~((1 << imp->im_bshift) - 1),
684 imp->logical_block_size, &bp);
691 * Setup the directory pointer for this inode
693 dirp = (ISODIR *)(bp->b_data + (ip->i_number & imp->im_bmask));
696 * Just make sure, we have a right one....
697 * 1: Check not cross boundary on block
699 if ((ip->i_number & imp->im_bmask) + isonum_711(dirp->length)
700 > (unsigned)imp->logical_block_size) {
707 * Abuse a namei buffer for now.
709 if (uio->uio_segflg == UIO_SYSSPACE)
710 symname = uio->uio_iov->iov_base;
712 symname = zalloc(namei_zone);
715 * Ok, we just gathering a symbolic name in SL record.
717 if (cd9660_rrip_getsymname(dirp, symname, &symlen, imp) == 0) {
718 if (uio->uio_segflg != UIO_SYSSPACE)
719 zfree(namei_zone, symname);
724 * Don't forget before you leave from home ;-)
729 * return with the symbolic name to caller's.
731 if (uio->uio_segflg != UIO_SYSSPACE) {
732 error = uiomove(symname, symlen, uio);
733 zfree(namei_zone, symname);
736 uio->uio_resid -= symlen;
737 uio->uio_iov->iov_base += symlen;
738 uio->uio_iov->iov_len -= symlen;
743 * Calculate the logical to physical mapping if not done already,
744 * then call the device strategy routine.
746 * cd9660_strategy(struct buf *a_vp, struct buf *a_bio)
749 cd9660_strategy(struct vop_strategy_args *ap)
751 struct bio *bio = ap->a_bio;
753 struct buf *bp = bio->bio_buf;
754 struct vnode *vp = ap->a_vp;
759 if (vp->v_type == VBLK || vp->v_type == VCHR)
760 panic("cd9660_strategy: spec");
761 nbio = push_bio(bio);
762 if (nbio->bio_offset == NOOFFSET) {
763 error = VOP_BMAP(vp, bio->bio_offset, NULL,
764 &nbio->bio_offset, NULL, NULL);
767 bp->b_flags |= B_ERROR;
768 /* I/O was never started on nbio, must biodone(bio) */
772 if (nbio->bio_offset == NOOFFSET)
775 if (nbio->bio_offset == NOOFFSET) {
776 /* I/O was never started on nbio, must biodone(bio) */
781 vn_strategy(vp, nbio);
786 * Print out the contents of an inode.
788 * cd9660_print(struct vnode *a_vp)
791 cd9660_print(struct vop_print_args *ap)
793 printf("tag VT_ISOFS, isofs vnode\n");
798 * Return POSIX pathconf information applicable to cd9660 filesystems.
800 * cd9660_pathconf(struct vnode *a_vp, int a_name, register_t *a_retval)
803 cd9660_pathconf(struct vop_pathconf_args *ap)
805 switch (ap->a_name) {
810 if (VTOI(ap->a_vp)->i_mnt->iso_ftype == ISO_FTYPE_RRIP)
811 *ap->a_retval = NAME_MAX;
816 *ap->a_retval = PATH_MAX;
819 *ap->a_retval = PIPE_BUF;
821 case _PC_CHOWN_RESTRICTED:
836 * XXX By default, wimp out... note that a_offset is ignored (and always
840 cd9660_getpages(struct vop_getpages_args *ap)
842 return vnode_pager_generic_getpages(ap->a_vp, ap->a_m, ap->a_count,
849 * XXX By default, wimp out... note that a_offset is ignored (and always
853 cd9660_putpages(struct vop_putpages_args *ap)
855 return vnode_pager_generic_putpages(ap->a_vp, ap->a_m, ap->a_count,
856 ap->a_sync, ap->a_rtvals);
860 * Advisory lock support
863 cd9660_advlock(struct vop_advlock_args *ap)
865 struct iso_node *ip = VTOI(ap->a_vp);
866 return (lf_advlock(ap, &(ip->i_lockf), ip->i_size));
871 * Global vfs data structures for cd9660
873 struct vnodeopv_entry_desc cd9660_vnodeop_entries[] = {
874 { &vop_default_desc, (vnodeopv_entry_t) vop_defaultop },
875 { &vop_open_desc, (vnodeopv_entry_t) cd9660_open},
876 { &vop_access_desc, (vnodeopv_entry_t) cd9660_access },
877 { &vop_advlock_desc, (vnodeopv_entry_t) cd9660_advlock },
878 { &vop_bmap_desc, (vnodeopv_entry_t) cd9660_bmap },
879 { &vop_old_lookup_desc, (vnodeopv_entry_t) cd9660_lookup },
880 { &vop_getattr_desc, (vnodeopv_entry_t) cd9660_getattr },
881 { &vop_inactive_desc, (vnodeopv_entry_t) cd9660_inactive },
882 { &vop_ioctl_desc, (vnodeopv_entry_t) cd9660_ioctl },
883 { &vop_islocked_desc, (vnodeopv_entry_t) vop_stdislocked },
884 { &vop_lock_desc, (vnodeopv_entry_t) vop_stdlock },
885 { &vop_pathconf_desc, (vnodeopv_entry_t) cd9660_pathconf },
886 { &vop_print_desc, (vnodeopv_entry_t) cd9660_print },
887 { &vop_read_desc, (vnodeopv_entry_t) cd9660_read },
888 { &vop_readdir_desc, (vnodeopv_entry_t) cd9660_readdir },
889 { &vop_readlink_desc, (vnodeopv_entry_t) cd9660_readlink },
890 { &vop_reclaim_desc, (vnodeopv_entry_t) cd9660_reclaim },
891 { &vop_setattr_desc, (vnodeopv_entry_t) cd9660_setattr },
892 { &vop_strategy_desc, (vnodeopv_entry_t) cd9660_strategy },
893 { &vop_unlock_desc, (vnodeopv_entry_t) vop_stdunlock },
894 { &vop_getpages_desc, (vnodeopv_entry_t) cd9660_getpages },
895 { &vop_putpages_desc, (vnodeopv_entry_t) cd9660_putpages },
900 * Special device vnode ops
902 struct vnodeopv_entry_desc cd9660_specop_entries[] = {
903 { &vop_default_desc, (vnodeopv_entry_t) spec_vnoperate },
904 { &vop_access_desc, (vnodeopv_entry_t) cd9660_access },
905 { &vop_getattr_desc, (vnodeopv_entry_t) cd9660_getattr },
906 { &vop_inactive_desc, (vnodeopv_entry_t) cd9660_inactive },
907 { &vop_islocked_desc, (vnodeopv_entry_t) vop_stdislocked },
908 { &vop_lock_desc, (vnodeopv_entry_t) vop_stdlock },
909 { &vop_print_desc, (vnodeopv_entry_t) cd9660_print },
910 { &vop_reclaim_desc, (vnodeopv_entry_t) cd9660_reclaim },
911 { &vop_setattr_desc, (vnodeopv_entry_t) cd9660_setattr },
912 { &vop_unlock_desc, (vnodeopv_entry_t) vop_stdunlock },
916 struct vnodeopv_entry_desc cd9660_fifoop_entries[] = {
917 { &vop_default_desc, (vnodeopv_entry_t) fifo_vnoperate },
918 { &vop_access_desc, (vnodeopv_entry_t) cd9660_access },
919 { &vop_getattr_desc, (vnodeopv_entry_t) cd9660_getattr },
920 { &vop_inactive_desc, (vnodeopv_entry_t) cd9660_inactive },
921 { &vop_islocked_desc, (vnodeopv_entry_t) vop_stdislocked },
922 { &vop_lock_desc, (vnodeopv_entry_t) vop_stdlock },
923 { &vop_print_desc, (vnodeopv_entry_t) cd9660_print },
924 { &vop_reclaim_desc, (vnodeopv_entry_t) cd9660_reclaim },
925 { &vop_setattr_desc, (vnodeopv_entry_t) cd9660_setattr },
926 { &vop_unlock_desc, (vnodeopv_entry_t) vop_stdunlock },