Current Path : /sys/fs/cd9660/ |
FreeBSD hs32.drive.ne.jp 9.1-RELEASE FreeBSD 9.1-RELEASE #1: Wed Jan 14 12:18:08 JST 2015 root@hs32.drive.ne.jp:/sys/amd64/compile/hs32 amd64 |
Current File : //sys/fs/cd9660/cd9660_vnops.c |
/*- * 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. * 4. 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 8.19 (Berkeley) 5/27/95 */ #include <sys/cdefs.h> __FBSDID("$FreeBSD: release/9.1.0/sys/fs/cd9660/cd9660_vnops.c 233353 2012-03-23 11:26:54Z kib $"); #include <sys/param.h> #include <sys/systm.h> #include <sys/namei.h> #include <sys/kernel.h> #include <sys/conf.h> #include <sys/stat.h> #include <sys/bio.h> #include <sys/buf.h> #include <sys/mount.h> #include <sys/vnode.h> #include <fs/fifofs/fifo.h> #include <sys/malloc.h> #include <sys/dirent.h> #include <sys/unistd.h> #include <sys/filio.h> #include <vm/vm.h> #include <vm/vnode_pager.h> #include <vm/uma.h> #include <fs/cd9660/iso.h> #include <fs/cd9660/cd9660_node.h> #include <fs/cd9660/iso_rrip.h> static vop_setattr_t cd9660_setattr; static vop_open_t cd9660_open; static vop_access_t cd9660_access; static vop_getattr_t cd9660_getattr; static vop_ioctl_t cd9660_ioctl; static vop_pathconf_t cd9660_pathconf; static vop_read_t cd9660_read; struct isoreaddir; static int iso_uiodir(struct isoreaddir *idp, struct dirent *dp, off_t off); static int iso_shipdir(struct isoreaddir *idp); static vop_readdir_t cd9660_readdir; static vop_readlink_t cd9660_readlink; static vop_strategy_t cd9660_strategy; static vop_vptofh_t cd9660_vptofh; /* * Setattr call. Only allowed for block and character special devices. */ static int cd9660_setattr(ap) struct vop_setattr_args /* { struct vnodeop_desc *a_desc; struct vnode *a_vp; struct vattr *a_vap; struct ucred *a_cred; } */ *ap; { struct vnode *vp = ap->a_vp; struct vattr *vap = ap->a_vap; if (vap->va_flags != (u_long)VNOVAL || vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL || vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL || vap->va_mode != (mode_t)VNOVAL) return (EROFS); if (vap->va_size != (u_quad_t)VNOVAL) { switch (vp->v_type) { case VDIR: return (EISDIR); case VLNK: case VREG: return (EROFS); case VCHR: case VBLK: case VSOCK: case VFIFO: case VNON: case VBAD: case VMARKER: return (0); } } 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. */ /* ARGSUSED */ static int cd9660_access(ap) struct vop_access_args /* { struct vnode *a_vp; accmode_t a_accmode; struct ucred *a_cred; struct thread *a_td; } */ *ap; { struct vnode *vp = ap->a_vp; struct iso_node *ip = VTOI(vp); accmode_t accmode = ap->a_accmode; if (vp->v_type == VCHR || vp->v_type == VBLK) return (EOPNOTSUPP); /* * Disallow write attempts unless the file is a socket, * fifo, or a block or character device resident on the * filesystem. */ if (accmode & VWRITE) { switch (vp->v_type) { case VDIR: case VLNK: case VREG: return (EROFS); /* NOT REACHED */ default: break; } } return (vaccess(vp->v_type, ip->inode.iso_mode, ip->inode.iso_uid, ip->inode.iso_gid, ap->a_accmode, ap->a_cred, NULL)); } static int cd9660_open(ap) struct vop_open_args /* { struct vnode *a_vp; int a_mode; struct ucred *a_cred; struct thread *a_td; struct file *a_fp; } */ *ap; { struct vnode *vp = ap->a_vp; struct iso_node *ip = VTOI(vp); if (vp->v_type == VCHR || vp->v_type == VBLK) return (EOPNOTSUPP); vnode_create_vobject(vp, ip->i_size, ap->a_td); return (0); } static int cd9660_getattr(ap) struct vop_getattr_args /* { struct vnode *a_vp; struct vattr *a_vap; struct ucred *a_cred; } */ *ap; { struct vnode *vp = ap->a_vp; struct vattr *vap = ap->a_vap; struct iso_node *ip = VTOI(vp); vap->va_fsid = dev2udev(ip->i_mnt->im_dev); vap->va_fileid = ip->i_number; vap->va_mode = ip->inode.iso_mode; 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 && (vap->va_mode & S_IFMT) == S_IFLNK) { 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_td = curthread; 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); } 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; vap->va_filerev = 0; return (0); } /* * Vnode op for ioctl. */ static int cd9660_ioctl(ap) struct vop_ioctl_args /* { struct vnode *a_vp; u_long a_command; caddr_t a_data; int a_fflag; struct ucred *a_cred; struct thread *a_td; } */ *ap; { struct vnode *vp; struct iso_node *ip; int error; vp = ap->a_vp; vn_lock(vp, LK_SHARED | LK_RETRY); if (vp->v_iflag & VI_DOOMED) { VOP_UNLOCK(vp, 0); return (EBADF); } if (vp->v_type == VCHR || vp->v_type == VBLK) { VOP_UNLOCK(vp, 0); return (EOPNOTSUPP); } ip = VTOI(vp); error = 0; switch (ap->a_command) { case FIOGETLBA: *(int *)(ap->a_data) = ip->iso_start; break; default: error = ENOTTY; break; } VOP_UNLOCK(vp, 0); return (error); } /* * Vnode op for reading. */ static int cd9660_read(ap) struct vop_read_args /* { struct vnode *a_vp; struct uio *a_uio; int a_ioflag; struct ucred *a_cred; } */ *ap; { 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 rasize, error = 0; int seqcount; long size, n, on; if (vp->v_type == VCHR || vp->v_type == VBLK) return (EOPNOTSUPP); seqcount = ap->a_ioflag >> IO_SEQSHIFT; if (uio->uio_resid == 0) return (0); if (uio->uio_offset < 0) return (EINVAL); imp = ip->i_mnt; do { lbn = lblkno(imp, uio->uio_offset); on = blkoff(imp, uio->uio_offset); n = MIN(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; if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERR) == 0) { if (lblktosize(imp, rablock) < ip->i_size) error = cluster_read(vp, (off_t)ip->i_size, lbn, size, NOCRED, uio->uio_resid, (ap->a_ioflag >> 16), &bp); else error = bread(vp, lbn, size, NOCRED, &bp); } else { if (seqcount > 1 && lblktosize(imp, rablock) < ip->i_size) { rasize = blksize(imp, ip, rablock); error = breadn(vp, lbn, size, &rablock, &rasize, 1, NOCRED, &bp); } else error = bread(vp, lbn, size, NOCRED, &bp); } n = MIN(n, size - bp->b_resid); if (error) { brelse(bp); return (error); } error = uiomove(bp->b_data + on, (int)n, uio); brelse(bp); } while (error == 0 && uio->uio_resid > 0 && n != 0); return (error); } /* * 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; u_long *cookies; int ncookies; }; static int iso_uiodir(idp,dp,off) struct isoreaddir *idp; struct dirent *dp; off_t off; { int error; dp->d_name[dp->d_namlen] = 0; dp->d_reclen = GENERIC_DIRSIZ(dp); if (idp->uio->uio_resid < dp->d_reclen) { idp->eofflag = 0; return (-1); } if (idp->cookies) { if (idp->ncookies <= 0) { idp->eofflag = 0; return (-1); } *idp->cookies++ = off; --idp->ncookies; } if ((error = uiomove(dp, dp->d_reclen, idp->uio)) != 0) return (error); idp->uio_off = off; return (0); } static int iso_shipdir(idp) 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; assoc = (cl > 1) && (*cname == ASSOCCHAR); if (assoc) { 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) { if ((error = iso_uiodir(idp,&idp->assocent,idp->assocoff)) != 0) return (error); idp->assocent.d_namlen = 0; } if (idp->saveent.d_namlen) { if ((error = iso_uiodir(idp,&idp->saveent,idp->saveoff)) != 0) return (error); idp->saveent.d_namlen = 0; } } } idp->current.d_reclen = GENERIC_DIRSIZ(&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 */ static int cd9660_readdir(ap) struct vop_readdir_args /* { struct vnode *a_vp; struct uio *a_uio; struct ucred *a_cred; int *a_eofflag; int *a_ncookies; u_long **a_cookies; } */ *ap; { 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; int ncookies = 0; u_long *cookies = NULL; dp = VTOI(vdp); imp = dp->i_mnt; bmask = imp->im_bmask; idp = malloc(sizeof(*idp), M_TEMP, M_WAITOK); idp->saveent.d_namlen = idp->assocent.d_namlen = 0; /* * 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; if (ap->a_ncookies == NULL) { idp->cookies = NULL; } else { /* * Guess the number of cookies needed. */ ncookies = uio->uio_resid / 16; cookies = malloc(ncookies * sizeof(u_long), M_TEMP, M_WAITOK); idp->cookies = cookies; idp->ncookies = ncookies; } idp->eofflag = 1; idp->curroff = uio->uio_offset; idp->uio_off = uio->uio_offset; if ((entryoffsetinblock = idp->curroff & bmask) && (error = cd9660_blkatoff(vdp, (off_t)idp->curroff, NULL, &bp))) { free(idp, M_TEMP); 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); if ((error = cd9660_blkatoff(vdp, (off_t)idp->curroff, NULL, &bp)) != 0) 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) idp->current.d_fileno = isodirino(ep, imp); else idp->current.d_fileno = 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, &idp->current.d_fileno,imp); 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 || ISO_FTYPE_HIGH_SIERRA*/ strcpy(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, imp->im_flags, imp->im_d2l); 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 (ap->a_ncookies != NULL) { if (error) free(cookies, M_TEMP); else { /* * Work out the number of cookies actually used. */ *ap->a_ncookies = ncookies - idp->ncookies; *ap->a_cookies = cookies; } } if (bp) brelse (bp); uio->uio_offset = idp->uio_off; *ap->a_eofflag = idp->eofflag; free(idp, M_TEMP); 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; static int cd9660_readlink(ap) struct vop_readlink_args /* { struct vnode *a_vp; struct uio *a_uio; struct ucred *a_cred; } */ *ap; { 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, NOCRED, &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) > (unsigned)imp->logical_block_size) { brelse(bp); return (EINVAL); } /* * Now get a buffer * Abuse a namei buffer for now. */ if (uio->uio_segflg == UIO_SYSSPACE) symname = uio->uio_iov->iov_base; else symname = uma_zalloc(namei_zone, M_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) uma_zfree(namei_zone, 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) { error = uiomove(symname, symlen, uio); uma_zfree(namei_zone, 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); } /* * Calculate the logical to physical mapping if not done already, * then call the device strategy routine. */ static int cd9660_strategy(ap) struct vop_strategy_args /* { struct buf *a_vp; struct buf *a_bp; } */ *ap; { struct buf *bp = ap->a_bp; struct vnode *vp = ap->a_vp; struct iso_node *ip; struct bufobj *bo; ip = VTOI(vp); if (vp->v_type == VBLK || vp->v_type == VCHR) panic("cd9660_strategy: spec"); if (bp->b_blkno == bp->b_lblkno) { bp->b_blkno = (ip->iso_start + bp->b_lblkno) << (ip->i_mnt->im_bshift - DEV_BSHIFT); } bp->b_iooffset = dbtob(bp->b_blkno); bo = ip->i_mnt->im_bo; BO_STRATEGY(bo, bp); return (0); } /* * Return POSIX pathconf information applicable to cd9660 filesystems. */ static int cd9660_pathconf(ap) struct vop_pathconf_args /* { struct vnode *a_vp; int a_name; register_t *a_retval; } */ *ap; { switch (ap->a_name) { case _PC_LINK_MAX: *ap->a_retval = 1; return (0); 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; return (0); case _PC_PATH_MAX: *ap->a_retval = PATH_MAX; return (0); case _PC_PIPE_BUF: *ap->a_retval = PIPE_BUF; return (0); case _PC_CHOWN_RESTRICTED: *ap->a_retval = 1; return (0); case _PC_NO_TRUNC: *ap->a_retval = 1; return (0); default: return (EINVAL); } /* NOTREACHED */ } /* * Vnode pointer to File handle */ static int cd9660_vptofh(ap) struct vop_vptofh_args /* { struct vnode *a_vp; struct fid *a_fhp; } */ *ap; { struct ifid ifh; struct iso_node *ip = VTOI(ap->a_vp); ifh.ifid_len = sizeof(struct ifid); ifh.ifid_ino = ip->i_number; ifh.ifid_start = ip->iso_start; /* * This intentionally uses sizeof(ifh) in order to not copy stack * garbage on ILP32. */ memcpy(ap->a_fhp, &ifh, sizeof(ifh)); #ifdef ISOFS_DBG printf("vptofh: ino %d, start %ld\n", ifh.ifid_ino, ifh.ifid_start); #endif return (0); } /* * Global vfs data structures for cd9660 */ struct vop_vector cd9660_vnodeops = { .vop_default = &default_vnodeops, .vop_open = cd9660_open, .vop_access = cd9660_access, .vop_bmap = cd9660_bmap, .vop_cachedlookup = cd9660_lookup, .vop_getattr = cd9660_getattr, .vop_inactive = cd9660_inactive, .vop_ioctl = cd9660_ioctl, .vop_lookup = vfs_cache_lookup, .vop_pathconf = cd9660_pathconf, .vop_read = cd9660_read, .vop_readdir = cd9660_readdir, .vop_readlink = cd9660_readlink, .vop_reclaim = cd9660_reclaim, .vop_setattr = cd9660_setattr, .vop_strategy = cd9660_strategy, .vop_vptofh = cd9660_vptofh, }; /* * Special device vnode ops */ struct vop_vector cd9660_fifoops = { .vop_default = &fifo_specops, .vop_access = cd9660_access, .vop_getattr = cd9660_getattr, .vop_inactive = cd9660_inactive, .vop_reclaim = cd9660_reclaim, .vop_setattr = cd9660_setattr, .vop_vptofh = cd9660_vptofh, };