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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20 * This product includes software developed by the University of
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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 $
42 #include <sys/param.h>
43 #include <sys/systm.h>
45 #include <sys/namei.h>
46 #include <sys/kernel.h>
49 #include <sys/mount.h>
50 #include <sys/vnode.h>
51 #include <vfs/fifofs/fifo.h>
52 #include <sys/malloc.h>
53 #include <sys/dirent.h>
54 #include <sys/unistd.h>
55 #include <sys/filio.h>
56 #include <sys/lockf.h>
57 #include <sys/objcache.h>
60 #include <vm/vnode_pager.h>
65 #include "cd9660_node.h"
68 static int cd9660_access (struct vop_access_args *);
69 static int cd9660_advlock (struct vop_advlock_args *);
70 static int cd9660_getattr (struct vop_getattr_args *);
71 static int cd9660_ioctl (struct vop_ioctl_args *);
72 static int cd9660_pathconf (struct vop_pathconf_args *);
73 static int cd9660_open (struct vop_open_args *);
74 static int cd9660_read (struct vop_read_args *);
75 static int cd9660_setattr (struct vop_setattr_args *);
77 static int iso_uiodir (struct isoreaddir *idp, struct dirent *dp,
79 static int iso_shipdir (struct isoreaddir *idp);
80 static int cd9660_readdir (struct vop_readdir_args *);
81 static int cd9660_readlink (struct vop_readlink_args *ap);
82 static int cd9660_strategy (struct vop_strategy_args *);
83 static int cd9660_print (struct vop_print_args *);
86 * Setattr call. Only allowed for block and character special devices.
88 * cd9660_setattr(struct vnode *a_vp, struct vattr *a_vap,
89 * struct ucred *a_cred, struct proc *a_p)
92 cd9660_setattr(struct vop_setattr_args *ap)
94 struct vnode *vp = ap->a_vp;
95 struct vattr *vap = ap->a_vap;
97 if (vap->va_flags != (u_long)VNOVAL || vap->va_uid != (uid_t)VNOVAL ||
98 vap->va_gid != (gid_t)VNOVAL || vap->va_atime.tv_sec != VNOVAL ||
99 vap->va_mtime.tv_sec != VNOVAL || vap->va_mode != (mode_t)VNOVAL)
101 if (vap->va_size != (u_quad_t)VNOVAL) {
102 switch (vp->v_type) {
121 * Check mode permission on inode pointer. Mode is READ, WRITE or EXEC.
122 * The mode is shifted to select the owner/group/other fields. The
123 * super user is granted all permissions.
125 * cd9660_access(struct vnode *a_vp, int a_mode, struct ucred *a_cred,
130 cd9660_access(struct vop_access_args *ap)
132 struct vnode *vp = ap->a_vp;
133 struct iso_node *ip = VTOI(vp);
135 KKASSERT(vp->v_mount->mnt_flag & MNT_RDONLY);
136 return (vop_helper_access(ap, ip->inode.iso_uid, ip->inode.iso_gid,
137 ip->inode.iso_mode, 0));
141 * cd9660_getattr(struct vnode *a_vp, struct vattr *a_vap)
144 cd9660_getattr(struct vop_getattr_args *ap)
146 struct vnode *vp = ap->a_vp;
147 struct vattr *vap = ap->a_vap;
148 struct iso_node *ip = VTOI(vp);
150 vap->va_fsid = dev2udev(ip->i_dev);
151 vap->va_fileid = ip->i_number;
153 vap->va_mode = ip->inode.iso_mode;
154 vap->va_nlink = ip->inode.iso_links;
155 vap->va_uid = ip->inode.iso_uid;
156 vap->va_gid = ip->inode.iso_gid;
157 vap->va_atime = ip->inode.iso_atime;
158 vap->va_mtime = ip->inode.iso_mtime;
159 vap->va_ctime = ip->inode.iso_ctime;
160 vap->va_rmajor = umajor(ip->inode.iso_rdev);
161 vap->va_rminor = uminor(ip->inode.iso_rdev);
163 vap->va_size = (u_quad_t)(unsigned long)ip->i_size;
164 if (ip->i_size == 0 && (vap->va_mode & S_IFMT) == S_IFLNK) {
165 struct vop_readlink_args rdlnk;
170 cp = kmalloc(MAXPATHLEN, M_TEMP, M_WAITOK);
172 aiov.iov_len = MAXPATHLEN;
173 auio.uio_iov = &aiov;
176 auio.uio_rw = UIO_READ;
177 auio.uio_segflg = UIO_SYSSPACE;
178 auio.uio_td = curthread;
179 auio.uio_resid = MAXPATHLEN;
181 rdlnk.a_vp = ap->a_vp;
182 rdlnk.a_cred = proc0.p_ucred; /* use root cred */
183 if (cd9660_readlink(&rdlnk) == 0)
184 vap->va_size = MAXPATHLEN - auio.uio_resid;
189 vap->va_blocksize = ip->i_mnt->logical_block_size;
190 vap->va_bytes = (u_quad_t) ip->i_size;
191 vap->va_type = vp->v_type;
197 * Vnode op for ioctl.
199 * cd9660_ioctl(struct vnode *a_vp, int a_command, caddr_t a_data,
200 * int a_fflag, struct ucred *a_cred, struct proc *a_p)
203 cd9660_ioctl(struct vop_ioctl_args *ap)
205 struct vnode *vp = ap->a_vp;
206 struct iso_node *ip = VTOI(vp);
208 switch (ap->a_command) {
211 *(int *)(ap->a_data) = ip->iso_start;
219 * open is called when the kernel intends to read or memory map a vnode.
222 cd9660_open(struct vop_open_args *ap)
224 return(vop_stdopen(ap));
228 * Vnode op for reading.
230 * cd9660_read(struct vnode *a_vp, struct uio *a_uio, int a_ioflag,
231 * struct ucred *a_cred)
234 cd9660_read(struct vop_read_args *ap)
236 struct vnode *vp = ap->a_vp;
237 struct uio *uio = ap->a_uio;
238 struct iso_node *ip = VTOI(vp);
241 daddr_t lbn, rablock;
245 int rasize, error = 0;
249 seqcount = ap->a_ioflag >> 16;
251 if (uio->uio_resid == 0)
253 if (uio->uio_offset < 0)
255 ip->i_flag |= IN_ACCESS;
258 lbn = lblkno(imp, uio->uio_offset);
259 loffset = lblktooff(imp, lbn);
260 on = blkoff(imp, uio->uio_offset);
261 n = szmin((u_int)(imp->logical_block_size - on),
263 diff = (off_t)ip->i_size - uio->uio_offset;
268 size = blksize(imp, ip, lbn);
270 raoffset = lblktooff(imp, rablock);
271 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERR) == 0) {
272 if (raoffset < ip->i_size) {
273 error = cluster_read(vp, (off_t)ip->i_size,
276 (ap->a_ioflag >> 16) *
280 error = bread(vp, loffset, size, &bp);
284 lblktosize(imp, rablock) < ip->i_size) {
285 rasize = blksize(imp, ip, rablock);
286 error = breadn(vp, loffset, size, &raoffset,
289 error = bread(vp, loffset, size, &bp);
291 n = imin(n, size - bp->b_resid);
297 error = uiomove(bp->b_data + on, (int)n, uio);
299 } while (error == 0 && uio->uio_resid > 0 && n != 0);
303 /* struct dirent + enough space for the maximum supported size */
306 char de_name[_DIRENT_RECLEN(NAME_MAX) - sizeof(struct dirent)];
310 * Structure for reading directories
313 struct iso_dirent saveent;
314 struct iso_dirent assocent;
315 struct iso_dirent current;
327 iso_uiodir(struct isoreaddir *idp, struct dirent *dp, off_t off)
331 dp->d_name[dp->d_namlen] = 0;
333 if (idp->uio->uio_resid < _DIRENT_DIRSIZ(dp)) {
339 if (idp->ncookies <= 0) {
344 *idp->cookies++ = off;
348 if ((error = uiomove((caddr_t) dp,_DIRENT_DIRSIZ(dp),idp->uio)) != 0)
355 iso_shipdir(struct isoreaddir *idp)
362 cl = idp->current.de.d_namlen;
363 cname = idp->current.de.d_name;
364 assoc = (cl > 1) && (*cname == ASSOCCHAR);
370 dp = &idp->saveent.de;
372 if (!(sl = dp->d_namlen)) {
373 dp = &idp->assocent.de;
374 sname = dp->d_name + 1;
375 sl = dp->d_namlen - 1;
379 || bcmp(sname,cname,sl)) {
380 if (idp->assocent.de.d_namlen) {
381 if ((error = iso_uiodir(idp,&idp->assocent.de,idp->assocoff)) != 0)
383 idp->assocent.de.d_namlen = 0;
385 if (idp->saveent.de.d_namlen) {
386 if ((error = iso_uiodir(idp,&idp->saveent.de,idp->saveoff)) != 0)
388 idp->saveent.de.d_namlen = 0;
393 idp->assocoff = idp->curroff;
394 bcopy(&idp->current,&idp->assocent,_DIRENT_DIRSIZ(&idp->current.de));
396 idp->saveoff = idp->curroff;
397 bcopy(&idp->current,&idp->saveent,_DIRENT_DIRSIZ(&idp->current.de));
403 * Vnode op for readdir
405 * cd9660_readdir(struct vnode *a_vp, struct uio *a_uio, struct ucred *a_cred,
406 * int *a_eofflag, int *a_ncookies, off_t *a_cookies)
409 cd9660_readdir(struct vop_readdir_args *ap)
411 struct uio *uio = ap->a_uio;
412 struct isoreaddir *idp;
413 struct vnode *vdp = ap->a_vp;
416 struct buf *bp = NULL;
417 struct iso_directory_record *ep;
418 int entryoffsetinblock;
425 off_t *cookies = NULL;
429 bmask = imp->im_bmask;
431 error = vn_lock(vdp, LK_EXCLUSIVE | LK_RETRY | LK_FAILRECLAIM);
435 idp = kmalloc(sizeof(*idp), M_TEMP, M_WAITOK);
436 idp->saveent.de.d_namlen = idp->assocent.de.d_namlen = 0;
439 * Is it worth trying to figure out the type?
441 idp->saveent.de.d_type = DT_UNKNOWN;
442 idp->assocent.de.d_type = DT_UNKNOWN;
443 idp->current.de.d_type = DT_UNKNOWN;
445 if (ap->a_ncookies == NULL) {
449 * Guess the number of cookies needed. Guess at least
450 * 1 to avoid a degenerate case in malloc, and cap at
451 * a reasonable limit.
453 ncookies = uio->uio_resid / 16 + 1;
456 cookies = kmalloc(ncookies * sizeof(off_t), M_TEMP, M_WAITOK);
457 idp->cookies = cookies;
458 idp->ncookies = ncookies;
461 idp->curroff = uio->uio_offset;
463 if ((entryoffsetinblock = idp->curroff & bmask) &&
464 (error = cd9660_devblkatoff(vdp, idp->curroff, NULL, &bp))) {
468 endsearch = dp->i_size;
470 while (idp->curroff < endsearch) {
472 * If offset is on a block boundary,
473 * read the next directory block.
474 * Release previous if it exists.
476 if ((idp->curroff & bmask) == 0) {
480 cd9660_devblkatoff(vdp, idp->curroff, NULL, &bp)) != 0)
482 entryoffsetinblock = 0;
485 * Get pointer to next entry.
487 ep = (struct iso_directory_record *)
488 ((char *)bp->b_data + entryoffsetinblock);
490 reclen = isonum_711(ep->length);
492 /* skip to next block, if any */
494 (idp->curroff & ~bmask) + imp->logical_block_size;
498 if (reclen < ISO_DIRECTORY_RECORD_SIZE) {
500 /* illegal entry, stop */
504 if (entryoffsetinblock + reclen > imp->logical_block_size) {
506 /* illegal directory, so stop looking */
510 idp->current.de.d_namlen = isonum_711(ep->name_len);
512 if (reclen < ISO_DIRECTORY_RECORD_SIZE + idp->current.de.d_namlen) {
514 /* illegal entry, stop */
518 if (isonum_711(ep->flags)&2)
519 idp->current.de.d_ino = isodirino(ep, imp);
521 idp->current.de.d_ino = bp->b_bio1.bio_offset +
524 idp->curroff += reclen;
526 switch (imp->iso_ftype) {
529 ino_t cur_fileno = idp->current.de.d_ino;
530 cd9660_rrip_getname(ep,idp->current.de.d_name, &namelen,
532 idp->current.de.d_ino = cur_fileno;
533 idp->current.de.d_namlen = namelen;
534 if (idp->current.de.d_namlen)
535 error = iso_uiodir(idp,&idp->current.de,idp->curroff);
538 default: /* ISO_FTYPE_DEFAULT || ISO_FTYPE_9660 || ISO_FTYPE_HIGH_SIERRA*/
539 strcpy(idp->current.de.d_name,"..");
540 if (idp->current.de.d_namlen == 1 && ep->name[0] == 0) {
541 idp->current.de.d_namlen = 1;
542 error = iso_uiodir(idp,&idp->current.de,idp->curroff);
543 } else if (idp->current.de.d_namlen == 1 && ep->name[0] == 1) {
544 idp->current.de.d_namlen = 2;
545 error = iso_uiodir(idp,&idp->current.de,idp->curroff);
547 isofntrans(ep->name,idp->current.de.d_namlen,
548 idp->current.de.d_name, &namelen,
549 imp->iso_ftype == ISO_FTYPE_9660,
550 isonum_711(ep->flags)&4,
554 idp->current.de.d_namlen = namelen;
555 if (imp->iso_ftype == ISO_FTYPE_DEFAULT)
556 error = iso_shipdir(idp);
558 error = iso_uiodir(idp,&idp->current.de,idp->curroff);
564 entryoffsetinblock += reclen;
567 if (!error && imp->iso_ftype == ISO_FTYPE_DEFAULT) {
568 idp->current.de.d_namlen = 0;
569 error = iso_shipdir(idp);
574 if (ap->a_ncookies != NULL) {
576 kfree(cookies, M_TEMP);
579 * Work out the number of cookies actually used.
581 *ap->a_ncookies = ncookies - idp->ncookies;
582 *ap->a_cookies = cookies;
589 uio->uio_offset = idp->uio_off;
590 *ap->a_eofflag = idp->eofflag;
600 * Return target name of a symbolic link
601 * Shouldn't we get the parent vnode and read the data from there?
602 * This could eventually result in deadlocks in cd9660_lookup.
603 * But otherwise the block read here is in the block buffer two times.
605 typedef struct iso_directory_record ISODIR;
606 typedef struct iso_node ISONODE;
607 typedef struct iso_mnt ISOMNT;
609 * cd9660_readlink(struct vnode *a_vp, struct uio *a_uio, struct ucred *a_cred)
612 cd9660_readlink(struct vop_readlink_args *ap)
627 if (imp->iso_ftype != ISO_FTYPE_RRIP)
631 * Get parents directory record block that this inode included.
633 error = bread(imp->im_devvp,
634 (off_t)ip->i_number & ~((1 << imp->im_bshift) - 1),
635 imp->logical_block_size, &bp);
642 * Setup the directory pointer for this inode
644 dirp = (ISODIR *)(bp->b_data + (ip->i_number & imp->im_bmask));
647 * Just make sure, we have a right one....
648 * 1: Check not cross boundary on block
650 if ((ip->i_number & imp->im_bmask) + isonum_711(dirp->length)
651 > (unsigned)imp->logical_block_size) {
658 * Abuse a namei buffer for now.
660 if (uio->uio_segflg == UIO_SYSSPACE)
661 symname = uio->uio_iov->iov_base;
663 symname = objcache_get(namei_oc, M_WAITOK);
666 * Ok, we just gathering a symbolic name in SL record.
668 if (cd9660_rrip_getsymname(dirp, symname, &symlen, imp) == 0) {
669 if (uio->uio_segflg != UIO_SYSSPACE)
670 objcache_put(namei_oc, symname);
675 * Don't forget before you leave from home ;-)
680 * return with the symbolic name to caller's.
682 if (uio->uio_segflg != UIO_SYSSPACE) {
683 error = uiomove(symname, symlen, uio);
684 objcache_put(namei_oc, symname);
687 uio->uio_resid -= symlen;
688 uio->uio_iov->iov_base = (char *)uio->uio_iov->iov_base + symlen;
689 uio->uio_iov->iov_len -= symlen;
694 * Calculate the logical to physical mapping if not done already,
695 * then call the device strategy routine.
697 * cd9660_strategy(struct buf *a_vp, struct buf *a_bio)
700 cd9660_strategy(struct vop_strategy_args *ap)
702 struct bio *bio = ap->a_bio;
704 struct buf *bp = bio->bio_buf;
705 struct vnode *vp = ap->a_vp;
710 if (vp->v_type == VBLK || vp->v_type == VCHR)
711 panic("cd9660_strategy: spec");
712 nbio = push_bio(bio);
713 if (nbio->bio_offset == NOOFFSET) {
714 error = VOP_BMAP(vp, bio->bio_offset,
715 &nbio->bio_offset, NULL, NULL, bp->b_cmd);
718 bp->b_flags |= B_ERROR;
719 /* I/O was never started on nbio, must biodone(bio) */
723 if (nbio->bio_offset == NOOFFSET)
726 if (nbio->bio_offset == NOOFFSET) {
727 /* I/O was never started on nbio, must biodone(bio) */
732 vn_strategy(vp, nbio);
737 * Print out the contents of an inode.
739 * cd9660_print(struct vnode *a_vp)
742 cd9660_print(struct vop_print_args *ap)
744 kprintf("tag VT_ISOFS, isofs vnode\n");
749 * Return POSIX pathconf information applicable to cd9660 filesystems.
751 * cd9660_pathconf(struct vnode *a_vp, int a_name, register_t *a_retval)
754 cd9660_pathconf(struct vop_pathconf_args *ap)
756 switch (ap->a_name) {
761 if (VTOI(ap->a_vp)->i_mnt->iso_ftype == ISO_FTYPE_RRIP)
762 *ap->a_retval = NAME_MAX;
767 *ap->a_retval = PATH_MAX;
770 *ap->a_retval = PIPE_BUF;
772 case _PC_CHOWN_RESTRICTED:
785 * Advisory lock support
788 cd9660_advlock(struct vop_advlock_args *ap)
790 struct iso_node *ip = VTOI(ap->a_vp);
791 return (lf_advlock(ap, &(ip->i_lockf), ip->i_size));
796 * Global vfs data structures for cd9660
798 struct vop_ops cd9660_vnode_vops = {
799 .vop_default = vop_defaultop,
800 .vop_open = cd9660_open,
801 .vop_access = cd9660_access,
802 .vop_advlock = cd9660_advlock,
803 .vop_bmap = cd9660_bmap,
804 .vop_old_lookup = cd9660_lookup,
805 .vop_getattr = cd9660_getattr,
806 .vop_inactive = cd9660_inactive,
807 .vop_ioctl = cd9660_ioctl,
808 .vop_pathconf = cd9660_pathconf,
809 .vop_print = cd9660_print,
810 .vop_read = cd9660_read,
811 .vop_readdir = cd9660_readdir,
812 .vop_readlink = cd9660_readlink,
813 .vop_reclaim = cd9660_reclaim,
814 .vop_setattr = cd9660_setattr,
815 .vop_strategy = cd9660_strategy,
816 .vop_getpages = vop_stdgetpages,
817 .vop_putpages = vop_stdputpages
821 * Special device vnode ops
823 struct vop_ops cd9660_spec_vops = {
824 .vop_default = vop_defaultop,
825 .vop_read = vop_stdnoread,
826 .vop_access = cd9660_access,
827 .vop_getattr = cd9660_getattr,
828 .vop_inactive = cd9660_inactive,
829 .vop_print = cd9660_print,
830 .vop_reclaim = cd9660_reclaim,
831 .vop_setattr = cd9660_setattr,
834 struct vop_ops cd9660_fifo_vops = {
835 .vop_default = fifo_vnoperate,
836 .vop_access = cd9660_access,
837 .vop_getattr = cd9660_getattr,
838 .vop_inactive = cd9660_inactive,
839 .vop_print = cd9660_print,
840 .vop_reclaim = cd9660_reclaim,
841 .vop_setattr = cd9660_setattr,