3 * The Regents of the University of California. All rights reserved.
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 1.37 2007/08/28 01:04:33 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 *);
85 * Setattr call. Only allowed for block and character special devices.
87 * cd9660_setattr(struct vnode *a_vp, struct vattr *a_vap,
88 * struct ucred *a_cred, struct proc *a_p)
91 cd9660_setattr(struct vop_setattr_args *ap)
93 struct vnode *vp = ap->a_vp;
94 struct vattr *vap = ap->a_vap;
96 if (vap->va_flags != (u_long)VNOVAL || vap->va_uid != (uid_t)VNOVAL ||
97 vap->va_gid != (gid_t)VNOVAL || vap->va_atime.tv_sec != VNOVAL ||
98 vap->va_mtime.tv_sec != VNOVAL || vap->va_mode != (mode_t)VNOVAL)
100 if (vap->va_size != (u_quad_t)VNOVAL) {
101 switch (vp->v_type) {
120 * Check mode permission on inode pointer. Mode is READ, WRITE or EXEC.
121 * The mode is shifted to select the owner/group/other fields. The
122 * super user is granted all permissions.
124 * cd9660_access(struct vnode *a_vp, int a_mode, struct ucred *a_cred,
129 cd9660_access(struct vop_access_args *ap)
131 struct vnode *vp = ap->a_vp;
132 struct iso_node *ip = VTOI(vp);
133 struct ucred *cred = ap->a_cred;
134 mode_t mask, mode = ap->a_mode;
139 * Disallow write attempts unless the file is a socket,
140 * fifo, or a block or character device resident on the
144 switch (vp->v_type) {
155 /* User id 0 always gets access. */
156 if (cred->cr_uid == 0)
161 /* Otherwise, check the owner. */
162 if (cred->cr_uid == ip->inode.iso_uid) {
169 return ((ip->inode.iso_mode & mask) == mask ? 0 : EACCES);
172 /* Otherwise, check the groups. */
173 for (i = 0, gp = cred->cr_groups; i < cred->cr_ngroups; i++, gp++)
174 if (ip->inode.iso_gid == *gp) {
181 return ((ip->inode.iso_mode & mask) == mask ?
185 /* Otherwise, check everyone else. */
192 return ((ip->inode.iso_mode & mask) == mask ? 0 : EACCES);
196 * cd9660_getattr(struct vnode *a_vp, struct vattr *a_vap)
199 cd9660_getattr(struct vop_getattr_args *ap)
201 struct vnode *vp = ap->a_vp;
202 struct vattr *vap = ap->a_vap;
203 struct iso_node *ip = VTOI(vp);
205 vap->va_fsid = dev2udev(ip->i_dev);
206 vap->va_fileid = ip->i_number;
208 vap->va_mode = ip->inode.iso_mode;
209 vap->va_nlink = ip->inode.iso_links;
210 vap->va_uid = ip->inode.iso_uid;
211 vap->va_gid = ip->inode.iso_gid;
212 vap->va_atime = ip->inode.iso_atime;
213 vap->va_mtime = ip->inode.iso_mtime;
214 vap->va_ctime = ip->inode.iso_ctime;
215 vap->va_rmajor = umajor(ip->inode.iso_rdev);
216 vap->va_rminor = uminor(ip->inode.iso_rdev);
218 vap->va_size = (u_quad_t)(unsigned long)ip->i_size;
219 if (ip->i_size == 0 && (vap->va_mode & S_IFMT) == S_IFLNK) {
220 struct vop_readlink_args rdlnk;
225 MALLOC(cp, char *, MAXPATHLEN, M_TEMP, M_WAITOK);
227 aiov.iov_len = MAXPATHLEN;
228 auio.uio_iov = &aiov;
231 auio.uio_rw = UIO_READ;
232 auio.uio_segflg = UIO_SYSSPACE;
233 auio.uio_td = curthread;
234 auio.uio_resid = MAXPATHLEN;
236 rdlnk.a_vp = ap->a_vp;
237 rdlnk.a_cred = proc0.p_ucred; /* use root cred */
238 if (cd9660_readlink(&rdlnk) == 0)
239 vap->va_size = MAXPATHLEN - auio.uio_resid;
244 vap->va_blocksize = ip->i_mnt->logical_block_size;
245 vap->va_bytes = (u_quad_t) ip->i_size;
246 vap->va_type = vp->v_type;
252 * Vnode op for ioctl.
254 * cd9660_ioctl(struct vnode *a_vp, int a_command, caddr_t a_data,
255 * int a_fflag, struct ucred *a_cred, struct proc *a_p)
258 cd9660_ioctl(struct vop_ioctl_args *ap)
260 struct vnode *vp = ap->a_vp;
261 struct iso_node *ip = VTOI(vp);
263 switch (ap->a_command) {
266 *(int *)(ap->a_data) = ip->iso_start;
274 * open is called when the kernel intends to read or memory map a vnode.
277 cd9660_open(struct vop_open_args *ap)
279 return(vop_stdopen(ap));
283 * Vnode op for reading.
285 * cd9660_read(struct vnode *a_vp, struct uio *a_uio, int a_ioflag,
286 * struct ucred *a_cred)
289 cd9660_read(struct vop_read_args *ap)
291 struct vnode *vp = ap->a_vp;
292 struct uio *uio = ap->a_uio;
293 struct iso_node *ip = VTOI(vp);
296 daddr_t lbn, rablock;
300 int rasize, error = 0;
304 seqcount = ap->a_ioflag >> 16;
306 if (uio->uio_resid == 0)
308 if (uio->uio_offset < 0)
310 ip->i_flag |= IN_ACCESS;
313 lbn = lblkno(imp, uio->uio_offset);
314 loffset = lblktooff(imp, lbn);
315 on = blkoff(imp, uio->uio_offset);
316 n = min((u_int)(imp->logical_block_size - on),
318 diff = (off_t)ip->i_size - uio->uio_offset;
323 size = blksize(imp, ip, lbn);
325 raoffset = lblktooff(imp, rablock);
326 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERR) == 0) {
327 if (raoffset < ip->i_size)
328 error = cluster_read(vp, (off_t)ip->i_size,
331 (ap->a_ioflag >> 16), &bp);
333 error = bread(vp, loffset, size, &bp);
336 lblktosize(imp, rablock) < ip->i_size) {
337 rasize = blksize(imp, ip, rablock);
338 error = breadn(vp, loffset, size, &raoffset,
341 error = bread(vp, loffset, size, &bp);
343 n = min(n, size - bp->b_resid);
349 error = uiomove(bp->b_data + on, (int)n, uio);
351 } while (error == 0 && uio->uio_resid > 0 && n != 0);
355 /* struct dirent + enough space for the maximum supported size */
358 char de_name[_DIRENT_RECLEN(NAME_MAX) - sizeof(struct dirent)];
362 * Structure for reading directories
365 struct iso_dirent saveent;
366 struct iso_dirent assocent;
367 struct iso_dirent current;
379 iso_uiodir(struct isoreaddir *idp, struct dirent *dp, off_t off)
383 dp->d_name[dp->d_namlen] = 0;
385 if (idp->uio->uio_resid < _DIRENT_DIRSIZ(dp)) {
391 if (idp->ncookies <= 0) {
396 *idp->cookies++ = off;
400 if ((error = uiomove((caddr_t) dp,_DIRENT_DIRSIZ(dp),idp->uio)) != 0)
407 iso_shipdir(struct isoreaddir *idp)
414 cl = idp->current.de.d_namlen;
415 cname = idp->current.de.d_name;
416 assoc = (cl > 1) && (*cname == ASSOCCHAR);
422 dp = &idp->saveent.de;
424 if (!(sl = dp->d_namlen)) {
425 dp = &idp->assocent.de;
426 sname = dp->d_name + 1;
427 sl = dp->d_namlen - 1;
431 || bcmp(sname,cname,sl)) {
432 if (idp->assocent.de.d_namlen) {
433 if ((error = iso_uiodir(idp,&idp->assocent.de,idp->assocoff)) != 0)
435 idp->assocent.de.d_namlen = 0;
437 if (idp->saveent.de.d_namlen) {
438 if ((error = iso_uiodir(idp,&idp->saveent.de,idp->saveoff)) != 0)
440 idp->saveent.de.d_namlen = 0;
445 idp->assocoff = idp->curroff;
446 bcopy(&idp->current,&idp->assocent,_DIRENT_DIRSIZ(&idp->current.de));
448 idp->saveoff = idp->curroff;
449 bcopy(&idp->current,&idp->saveent,_DIRENT_DIRSIZ(&idp->current.de));
455 * Vnode op for readdir
457 * cd9660_readdir(struct vnode *a_vp, struct uio *a_uio, struct ucred *a_cred,
458 * int *a_eofflag, int *a_ncookies, u_long *a_cookies)
461 cd9660_readdir(struct vop_readdir_args *ap)
463 struct uio *uio = ap->a_uio;
464 struct isoreaddir *idp;
465 struct vnode *vdp = ap->a_vp;
468 struct buf *bp = NULL;
469 struct iso_directory_record *ep;
470 int entryoffsetinblock;
477 u_long *cookies = NULL;
481 bmask = imp->im_bmask;
483 if ((error = vn_lock(vdp, LK_EXCLUSIVE|LK_RETRY)) != 0)
486 MALLOC(idp, struct isoreaddir *, sizeof(*idp), M_TEMP, M_WAITOK);
487 idp->saveent.de.d_namlen = idp->assocent.de.d_namlen = 0;
490 * Is it worth trying to figure out the type?
492 idp->saveent.de.d_type = DT_UNKNOWN;
493 idp->assocent.de.d_type = DT_UNKNOWN;
494 idp->current.de.d_type = DT_UNKNOWN;
496 if (ap->a_ncookies == NULL) {
500 * Guess the number of cookies needed. Guess at least
501 * 1 to avoid a degenerate case in malloc, and cap at
502 * a reasonable limit.
504 ncookies = uio->uio_resid / 16 + 1;
507 MALLOC(cookies, u_long *, ncookies * sizeof(u_int),
509 idp->cookies = cookies;
510 idp->ncookies = ncookies;
513 idp->curroff = uio->uio_offset;
515 if ((entryoffsetinblock = idp->curroff & bmask) &&
516 (error = cd9660_devblkatoff(vdp, (off_t)idp->curroff, NULL, &bp))) {
520 endsearch = dp->i_size;
522 while (idp->curroff < endsearch) {
524 * If offset is on a block boundary,
525 * read the next directory block.
526 * Release previous if it exists.
528 if ((idp->curroff & bmask) == 0) {
532 cd9660_devblkatoff(vdp, (off_t)idp->curroff, NULL, &bp)) != 0)
534 entryoffsetinblock = 0;
537 * Get pointer to next entry.
539 ep = (struct iso_directory_record *)
540 ((char *)bp->b_data + entryoffsetinblock);
542 reclen = isonum_711(ep->length);
544 /* skip to next block, if any */
546 (idp->curroff & ~bmask) + imp->logical_block_size;
550 if (reclen < ISO_DIRECTORY_RECORD_SIZE) {
552 /* illegal entry, stop */
556 if (entryoffsetinblock + reclen > imp->logical_block_size) {
558 /* illegal directory, so stop looking */
562 idp->current.de.d_namlen = isonum_711(ep->name_len);
564 if (reclen < ISO_DIRECTORY_RECORD_SIZE + idp->current.de.d_namlen) {
566 /* illegal entry, stop */
570 if (isonum_711(ep->flags)&2)
571 idp->current.de.d_ino = isodirino(ep, imp);
573 idp->current.de.d_ino = bp->b_bio1.bio_offset +
576 idp->curroff += reclen;
578 switch (imp->iso_ftype) {
581 ino_t cur_fileno = idp->current.de.d_ino;
582 cd9660_rrip_getname(ep,idp->current.de.d_name, &namelen,
584 idp->current.de.d_ino = cur_fileno;
585 idp->current.de.d_namlen = namelen;
586 if (idp->current.de.d_namlen)
587 error = iso_uiodir(idp,&idp->current.de,idp->curroff);
590 default: /* ISO_FTYPE_DEFAULT || ISO_FTYPE_9660 || ISO_FTYPE_HIGH_SIERRA*/
591 strcpy(idp->current.de.d_name,"..");
592 if (idp->current.de.d_namlen == 1 && ep->name[0] == 0) {
593 idp->current.de.d_namlen = 1;
594 error = iso_uiodir(idp,&idp->current.de,idp->curroff);
595 } else if (idp->current.de.d_namlen == 1 && ep->name[0] == 1) {
596 idp->current.de.d_namlen = 2;
597 error = iso_uiodir(idp,&idp->current.de,idp->curroff);
599 isofntrans(ep->name,idp->current.de.d_namlen,
600 idp->current.de.d_name, &namelen,
601 imp->iso_ftype == ISO_FTYPE_9660,
602 isonum_711(ep->flags)&4,
604 idp->current.de.d_namlen = namelen;
605 if (imp->iso_ftype == ISO_FTYPE_DEFAULT)
606 error = iso_shipdir(idp);
608 error = iso_uiodir(idp,&idp->current.de,idp->curroff);
614 entryoffsetinblock += reclen;
617 if (!error && imp->iso_ftype == ISO_FTYPE_DEFAULT) {
618 idp->current.de.d_namlen = 0;
619 error = iso_shipdir(idp);
624 if (ap->a_ncookies != NULL) {
626 kfree(cookies, M_TEMP);
629 * Work out the number of cookies actually used.
631 *ap->a_ncookies = ncookies - idp->ncookies;
632 *ap->a_cookies = cookies;
639 uio->uio_offset = idp->uio_off;
640 *ap->a_eofflag = idp->eofflag;
650 * Return target name of a symbolic link
651 * Shouldn't we get the parent vnode and read the data from there?
652 * This could eventually result in deadlocks in cd9660_lookup.
653 * But otherwise the block read here is in the block buffer two times.
655 typedef struct iso_directory_record ISODIR;
656 typedef struct iso_node ISONODE;
657 typedef struct iso_mnt ISOMNT;
659 * cd9660_readlink(struct vnode *a_vp, struct uio *a_uio, struct ucred *a_cred)
662 cd9660_readlink(struct vop_readlink_args *ap)
677 if (imp->iso_ftype != ISO_FTYPE_RRIP)
681 * Get parents directory record block that this inode included.
683 error = bread(imp->im_devvp,
684 (off_t)ip->i_number & ~((1 << imp->im_bshift) - 1),
685 imp->logical_block_size, &bp);
692 * Setup the directory pointer for this inode
694 dirp = (ISODIR *)(bp->b_data + (ip->i_number & imp->im_bmask));
697 * Just make sure, we have a right one....
698 * 1: Check not cross boundary on block
700 if ((ip->i_number & imp->im_bmask) + isonum_711(dirp->length)
701 > (unsigned)imp->logical_block_size) {
708 * Abuse a namei buffer for now.
710 if (uio->uio_segflg == UIO_SYSSPACE)
711 symname = uio->uio_iov->iov_base;
713 symname = objcache_get(namei_oc, M_WAITOK);
716 * Ok, we just gathering a symbolic name in SL record.
718 if (cd9660_rrip_getsymname(dirp, symname, &symlen, imp) == 0) {
719 if (uio->uio_segflg != UIO_SYSSPACE)
720 objcache_put(namei_oc, symname);
725 * Don't forget before you leave from home ;-)
730 * return with the symbolic name to caller's.
732 if (uio->uio_segflg != UIO_SYSSPACE) {
733 error = uiomove(symname, symlen, uio);
734 objcache_put(namei_oc, symname);
737 uio->uio_resid -= symlen;
738 uio->uio_iov->iov_base += symlen;
739 uio->uio_iov->iov_len -= symlen;
744 * Calculate the logical to physical mapping if not done already,
745 * then call the device strategy routine.
747 * cd9660_strategy(struct buf *a_vp, struct buf *a_bio)
750 cd9660_strategy(struct vop_strategy_args *ap)
752 struct bio *bio = ap->a_bio;
754 struct buf *bp = bio->bio_buf;
755 struct vnode *vp = ap->a_vp;
760 if (vp->v_type == VBLK || vp->v_type == VCHR)
761 panic("cd9660_strategy: spec");
762 nbio = push_bio(bio);
763 if (nbio->bio_offset == NOOFFSET) {
764 error = VOP_BMAP(vp, bio->bio_offset,
765 &nbio->bio_offset, NULL, NULL);
768 bp->b_flags |= B_ERROR;
769 /* I/O was never started on nbio, must biodone(bio) */
773 if (nbio->bio_offset == NOOFFSET)
776 if (nbio->bio_offset == NOOFFSET) {
777 /* I/O was never started on nbio, must biodone(bio) */
782 vn_strategy(vp, nbio);
787 * Print out the contents of an inode.
789 * cd9660_print(struct vnode *a_vp)
792 cd9660_print(struct vop_print_args *ap)
794 kprintf("tag VT_ISOFS, isofs vnode\n");
799 * Return POSIX pathconf information applicable to cd9660 filesystems.
801 * cd9660_pathconf(struct vnode *a_vp, int a_name, register_t *a_retval)
804 cd9660_pathconf(struct vop_pathconf_args *ap)
806 switch (ap->a_name) {
811 if (VTOI(ap->a_vp)->i_mnt->iso_ftype == ISO_FTYPE_RRIP)
812 *ap->a_retval = NAME_MAX;
817 *ap->a_retval = PATH_MAX;
820 *ap->a_retval = PIPE_BUF;
822 case _PC_CHOWN_RESTRICTED:
835 * Advisory lock support
838 cd9660_advlock(struct vop_advlock_args *ap)
840 struct iso_node *ip = VTOI(ap->a_vp);
841 return (lf_advlock(ap, &(ip->i_lockf), ip->i_size));
846 * Global vfs data structures for cd9660
848 struct vop_ops cd9660_vnode_vops = {
849 .vop_default = vop_defaultop,
850 .vop_open = cd9660_open,
851 .vop_access = cd9660_access,
852 .vop_advlock = cd9660_advlock,
853 .vop_bmap = cd9660_bmap,
854 .vop_old_lookup = cd9660_lookup,
855 .vop_getattr = cd9660_getattr,
856 .vop_inactive = cd9660_inactive,
857 .vop_ioctl = cd9660_ioctl,
858 .vop_pathconf = cd9660_pathconf,
859 .vop_print = cd9660_print,
860 .vop_read = cd9660_read,
861 .vop_readdir = cd9660_readdir,
862 .vop_readlink = cd9660_readlink,
863 .vop_reclaim = cd9660_reclaim,
864 .vop_setattr = cd9660_setattr,
865 .vop_strategy = cd9660_strategy,
866 .vop_getpages = vop_stdgetpages,
867 .vop_putpages = vop_stdputpages
871 * Special device vnode ops
873 struct vop_ops cd9660_spec_vops = {
874 .vop_default = spec_vnoperate,
875 .vop_access = cd9660_access,
876 .vop_getattr = cd9660_getattr,
877 .vop_inactive = cd9660_inactive,
878 .vop_print = cd9660_print,
879 .vop_reclaim = cd9660_reclaim,
880 .vop_setattr = cd9660_setattr,
883 struct vop_ops cd9660_fifo_vops = {
884 .vop_default = fifo_vnoperate,
885 .vop_access = cd9660_access,
886 .vop_getattr = cd9660_getattr,
887 .vop_inactive = cd9660_inactive,
888 .vop_print = cd9660_print,
889 .vop_reclaim = cd9660_reclaim,
890 .vop_setattr = cd9660_setattr,