/* $OpenBSD: udf_vnops.c,v 1.36 2009/07/09 22:29:56 thib Exp $ */ /* * Copyright (c) 2001, 2002 Scott Long * All rights reserved. * * 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. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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. * * $FreeBSD: src/sys/fs/udf/udf_vnops.c,v 1.50 2005/01/28 14:42:16 phk Exp $ */ /* * Ported to OpenBSD by Pedro Martelletto in February 2005. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include int udf_bmap_internal(struct unode *, off_t, daddr64_t *, uint32_t *); int (**udf_vnodeop_p)(void *); struct vnodeopv_entry_desc udf_vnodeop_entries[] = { { &vop_default_desc, eopnotsupp }, { &vop_access_desc, udf_access }, /* access */ { &vop_bmap_desc, udf_bmap }, /* bmap */ { &vop_lookup_desc, udf_lookup }, /* lookup */ { &vop_getattr_desc, udf_getattr }, /* getattr */ { &vop_open_desc, udf_open }, /* open */ { &vop_close_desc, udf_close }, /* close */ { &vop_ioctl_desc, udf_ioctl }, /* ioctl */ { &vop_read_desc, udf_read }, /* read */ { &vop_readdir_desc, udf_readdir }, /* readdir */ { &vop_readlink_desc, udf_readlink }, /* readlink */ { &vop_inactive_desc, udf_inactive }, /* inactive */ { &vop_reclaim_desc, udf_reclaim }, /* reclaim */ { &vop_strategy_desc, udf_strategy }, /* strategy */ { &vop_lock_desc, udf_lock }, /* lock */ { &vop_unlock_desc, udf_unlock }, /* unlock */ { &vop_islocked_desc, udf_islocked }, /* islocked */ { &vop_print_desc, udf_print }, /* print */ { NULL, NULL } }; struct vnodeopv_desc udf_vnodeop_opv_desc = { &udf_vnodeop_p, udf_vnodeop_entries }; #define UDF_INVALID_BMAP -1 /* Look up a unode based on the ino_t passed in and return its vnode */ int udf_hashlookup(struct umount *ump, ino_t id, int flags, struct vnode **vpp) { struct unode *up; struct udf_hash_lh *lh; struct proc *p = curproc; int error; *vpp = NULL; loop: mtx_enter(&ump->um_hashmtx); lh = &ump->um_hashtbl[id & ump->um_hashsz]; if (lh == NULL) { mtx_leave(&ump->um_hashmtx); return (ENOENT); } LIST_FOREACH(up, lh, u_le) { if (up->u_ino == id) { mtx_leave(&ump->um_hashmtx); error = vget(up->u_vnode, flags, p); if (error == ENOENT) goto loop; if (error) return (error); *vpp = up->u_vnode; return (0); } } mtx_leave(&ump->um_hashmtx); return (0); } int udf_hashins(struct unode *up) { struct umount *ump; struct udf_hash_lh *lh; struct proc *p = curproc; ump = up->u_ump; vn_lock(up->u_vnode, LK_EXCLUSIVE | LK_RETRY, p); mtx_enter(&ump->um_hashmtx); lh = &ump->um_hashtbl[up->u_ino & ump->um_hashsz]; if (lh == NULL) panic("hash entry is NULL, up->u_ino = %d", up->u_ino); LIST_INSERT_HEAD(lh, up, u_le); mtx_leave(&ump->um_hashmtx); return (0); } int udf_hashrem(struct unode *up) { struct umount *ump; struct udf_hash_lh *lh; ump = up->u_ump; mtx_enter(&ump->um_hashmtx); lh = &ump->um_hashtbl[up->u_ino & ump->um_hashsz]; if (lh == NULL) panic("hash entry is NULL, up->u_ino = %d", up->u_ino); LIST_REMOVE(up, u_le); mtx_leave(&ump->um_hashmtx); return (0); } int udf_allocv(struct mount *mp, struct vnode **vpp, struct proc *p) { int error; struct vnode *vp; error = getnewvnode(VT_UDF, mp, udf_vnodeop_p, &vp); if (error) { printf("udf_allocv: failed to allocate new vnode\n"); return (error); } *vpp = vp; return (0); } /* Convert file entry permission (5 bits per owner/group/user) to a mode_t */ static mode_t udf_permtomode(struct unode *up) { uint32_t perm; uint16_t flags; mode_t mode; perm = letoh32(up->u_fentry->perm); flags = letoh16(up->u_fentry->icbtag.flags); mode = perm & UDF_FENTRY_PERM_USER_MASK; mode |= ((perm & UDF_FENTRY_PERM_GRP_MASK) >> 2); mode |= ((perm & UDF_FENTRY_PERM_OWNER_MASK) >> 4); mode |= ((flags & UDF_ICB_TAG_FLAGS_STICKY) << 4); mode |= ((flags & UDF_ICB_TAG_FLAGS_SETGID) << 6); mode |= ((flags & UDF_ICB_TAG_FLAGS_SETUID) << 8); return (mode); } int udf_access(void *v) { struct vop_access_args *ap = v; struct vnode *vp; struct unode *up; mode_t a_mode, mode; vp = ap->a_vp; up = VTOU(vp); a_mode = ap->a_mode; if (a_mode & VWRITE) { switch (vp->v_type) { case VDIR: case VLNK: case VREG: return (EROFS); /* NOTREACHED */ default: break; } } mode = udf_permtomode(up); return (vaccess(vp->v_type, mode, up->u_fentry->uid, up->u_fentry->gid, a_mode, ap->a_cred)); } static int mon_lens[2][12] = { {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}, {31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31} }; static int udf_isaleapyear(int year) { int i; i = (year % 4) ? 0 : 1; i &= (year % 100) ? 1 : 0; i |= (year % 400) ? 0 : 1; return (i); } /* * This is just a rough hack. Daylight savings isn't calculated and tv_nsec * is ignored. * Timezone calculation compliments of Julian Elischer . */ static void udf_timetotimespec(struct timestamp *time, struct timespec *t) { int i, lpyear, daysinyear, year; union { uint16_t u_tz_offset; int16_t s_tz_offset; } tz; t->tv_nsec = 0; /* DirectCD seems to like using bogus year values */ year = letoh16(time->year); if (year < 1970) { t->tv_sec = 0; return; } /* Calculate the time and day */ t->tv_sec = time->second; t->tv_sec += time->minute * 60; t->tv_sec += time->hour * 3600; t->tv_sec += time->day * 3600 * 24; /* Calculate the month */ lpyear = udf_isaleapyear(year); for (i = 1; i < time->month; i++) t->tv_sec += mon_lens[lpyear][i] * 3600 * 24; /* Speed up the calculation */ if (year > 1979) t->tv_sec += 315532800; if (year > 1989) t->tv_sec += 315619200; if (year > 1999) t->tv_sec += 315532800; for (i = 2000; i < year; i++) { daysinyear = udf_isaleapyear(i) + 365 ; t->tv_sec += daysinyear * 3600 * 24; } /* * Calculate the time zone. The timezone is 12 bit signed 2's * compliment, so we gotta do some extra magic to handle it right. */ tz.u_tz_offset = letoh16(time->type_tz); tz.u_tz_offset &= 0x0fff; if (tz.u_tz_offset & 0x0800) tz.u_tz_offset |= 0xf000; /* extend the sign to 16 bits */ if ((time->type_tz & 0x1000) && (tz.s_tz_offset != -2047)) t->tv_sec -= tz.s_tz_offset * 60; return; } int udf_getattr(void *v) { struct vop_getattr_args *ap = v; struct vnode *vp; struct unode *up; struct vattr *vap; struct file_entry *fentry; struct timespec ts; ts.tv_sec = 0; vp = ap->a_vp; vap = ap->a_vap; up = VTOU(vp); fentry = up->u_fentry; vap->va_fsid = up->u_dev; vap->va_fileid = up->u_ino; vap->va_mode = udf_permtomode(up); vap->va_nlink = letoh16(fentry->link_cnt); /* * The spec says that -1 is valid for uid/gid and indicates an * invalid uid/gid. How should this be represented? */ vap->va_uid = (letoh32(fentry->uid) == -1) ? 0 : letoh32(fentry->uid); vap->va_gid = (letoh32(fentry->gid) == -1) ? 0 : letoh32(fentry->gid); udf_timetotimespec(&fentry->atime, &vap->va_atime); udf_timetotimespec(&fentry->mtime, &vap->va_mtime); vap->va_ctime = vap->va_mtime; /* Stored as an Extended Attribute */ vap->va_rdev = 0; if (vp->v_type & VDIR) { vap->va_nlink++; /* Count a reference to ourselves */ /* * Directories that are recorded within their ICB will show * as having 0 blocks recorded. Since tradition dictates * that directories consume at least one logical block, * make it appear so. */ if (fentry->logblks_rec != 0) { vap->va_size = letoh64(fentry->logblks_rec) * up->u_ump->um_bsize; } else { vap->va_size = up->u_ump->um_bsize; } } else { vap->va_size = letoh64(fentry->inf_len); } vap->va_flags = 0; vap->va_gen = 1; vap->va_blocksize = up->u_ump->um_bsize; vap->va_bytes = letoh64(fentry->inf_len); vap->va_type = vp->v_type; vap->va_filerev = 0; return (0); } int udf_open(void *v) { return (0); /* Nothing to be done at this point */ } int udf_close(void *v) { return (0); /* Nothing to be done at this point */ } /* * File specific ioctls. */ int udf_ioctl(void *v) { return (ENOTTY); } /* * I'm not sure that this has much value in a read-only filesystem, but * cd9660 has it too. */ #if 0 static int udf_pathconf(struct vop_pathconf_args *a) { switch (ap->a_name) { case _PC_LINK_MAX: *ap->a_retval = 65535; return (0); case _PC_NAME_MAX: *ap->a_retval = NAME_MAX; return (0); case _PC_PATH_MAX: *ap->a_retval = PATH_MAX; return (0); case _PC_NO_TRUNC: *ap->a_retval = 1; return (0); default: return (EINVAL); } } #endif int udf_read(void *v) { struct vop_read_args *ap = v; struct vnode *vp = ap->a_vp; struct uio *uio = ap->a_uio; struct unode *up = VTOU(vp); struct buf *bp; uint8_t *data; off_t fsize, offset; int error = 0; int size; if (uio->uio_offset < 0) return (EINVAL); fsize = letoh64(up->u_fentry->inf_len); while (uio->uio_offset < fsize && uio->uio_resid > 0) { offset = uio->uio_offset; if (uio->uio_resid + offset <= fsize) size = uio->uio_resid; else size = fsize - offset; error = udf_readatoffset(up, &size, offset, &bp, &data); if (error == 0) error = uiomove(data, size, uio); if (bp != NULL) brelse(bp); if (error) break; }; return (error); } /* * Translate the name from a CS0 dstring to a 16-bit Unicode String. * Hooks need to be placed in here to translate from Unicode to the encoding * that the kernel/user expects. Return the length of the translated string. */ int udf_transname(char *cs0string, char *destname, int len, struct umount *ump) { unicode_t *transname; int i, unilen = 0, destlen; if (len > MAXNAMLEN) { #ifdef DIAGNOSTIC printf("udf_transname(): name too long\n"); #endif return (0); } /* allocate a buffer big enough to hold an 8->16 bit expansion */ transname = pool_get(&udf_trans_pool, PR_WAITOK); if ((unilen = udf_rawnametounicode(len, cs0string, transname)) == -1) { #ifdef DIAGNOSTIC printf("udf_transname(): Unicode translation failed\n"); #endif pool_put(&udf_trans_pool, transname); return (0); } /* Pack it back to 8-bit Unicode. */ for (i = 0; i < unilen ; i++) if (transname[i] & 0xff00) destname[i] = '?'; /* Fudge the 16bit chars */ else destname[i] = transname[i] & 0xff; pool_put(&udf_trans_pool, transname); /* Don't forget to terminate the string. */ destname[unilen] = 0; destlen = unilen; return (destlen); } /* * Compare a CS0 dstring with a name passed in from the VFS layer. Return * 0 on a successful match, nonzero otherwise. Unicode work may need to be * done here also. */ static int udf_cmpname(char *cs0string, char *cmpname, int cs0len, int cmplen, struct umount *ump) { char *transname; int error = 0; /* This is overkill, but not worth creating a new pool */ transname = pool_get(&udf_trans_pool, PR_WAITOK); cs0len = udf_transname(cs0string, transname, cs0len, ump); /* Easy check. If they aren't the same length, they aren't equal */ if ((cs0len == 0) || (cs0len != cmplen)) error = -1; else error = bcmp(transname, cmpname, cmplen); pool_put(&udf_trans_pool, transname); return (error); } struct udf_uiodir { struct dirent *dirent; u_long *cookies; int ncookies; int acookies; int eofflag; }; static int udf_uiodir(struct udf_uiodir *uiodir, int de_size, struct uio *uio, long cookie) { if (uiodir->cookies != NULL) { if (++uiodir->acookies > uiodir->ncookies) { uiodir->eofflag = 0; return (-1); } *uiodir->cookies++ = cookie; } if (uio->uio_resid < de_size) { uiodir->eofflag = 0; return (-1); } return (uiomove(uiodir->dirent, de_size, uio)); } static struct udf_dirstream * udf_opendir(struct unode *up, int offset, int fsize, struct umount *ump) { struct udf_dirstream *ds; ds = pool_get(&udf_ds_pool, PR_WAITOK | PR_ZERO); ds->node = up; ds->offset = offset; ds->ump = ump; ds->fsize = fsize; return (ds); } static struct fileid_desc * udf_getfid(struct udf_dirstream *ds) { struct fileid_desc *fid; int error, frag_size = 0, total_fid_size; /* End of directory? */ if (ds->offset + ds->off >= ds->fsize) { ds->error = 0; return (NULL); } /* Grab the first extent of the directory */ if (ds->off == 0) { ds->size = 0; error = udf_readatoffset(ds->node, &ds->size, ds->offset, &ds->bp, &ds->data); if (error) { ds->error = error; if (ds->bp != NULL) brelse(ds->bp); return (NULL); } } /* * Clean up from a previous fragmented FID. * Is this the right place for this? */ if (ds->fid_fragment && ds->buf != NULL) { ds->fid_fragment = 0; free(ds->buf, M_UDFFID); } fid = (struct fileid_desc*)&ds->data[ds->off]; /* * Check to see if the fid is fragmented. The first test * ensures that we don't wander off the end of the buffer * looking for the l_iu and l_fi fields. */ if (ds->off + UDF_FID_SIZE > ds->size || ds->off + letoh16(fid->l_iu) + fid->l_fi + UDF_FID_SIZE > ds->size){ /* Copy what we have of the fid into a buffer */ frag_size = ds->size - ds->off; if (frag_size >= ds->ump->um_bsize) { printf("udf: invalid FID fragment\n"); ds->error = EINVAL; return (NULL); } /* * File ID descriptors can only be at most one * logical sector in size. */ ds->buf = malloc(ds->ump->um_bsize, M_UDFFID, M_WAITOK|M_ZERO); bcopy(fid, ds->buf, frag_size); /* Reduce all of the casting magic */ fid = (struct fileid_desc*)ds->buf; if (ds->bp != NULL) brelse(ds->bp); /* Fetch the next allocation */ ds->offset += ds->size; ds->size = 0; error = udf_readatoffset(ds->node, &ds->size, ds->offset, &ds->bp, &ds->data); if (error) { ds->error = error; return (NULL); } /* * If the fragment was so small that we didn't get * the l_iu and l_fi fields, copy those in. */ if (frag_size < UDF_FID_SIZE) bcopy(ds->data, &ds->buf[frag_size], UDF_FID_SIZE - frag_size); /* * Now that we have enough of the fid to work with, * copy in the rest of the fid from the new * allocation. */ total_fid_size = UDF_FID_SIZE + letoh16(fid->l_iu) + fid->l_fi; if (total_fid_size > ds->ump->um_bsize) { printf("udf: invalid FID\n"); ds->error = EIO; return (NULL); } bcopy(ds->data, &ds->buf[frag_size], total_fid_size - frag_size); ds->fid_fragment = 1; } else { total_fid_size = letoh16(fid->l_iu) + fid->l_fi + UDF_FID_SIZE; } /* * Update the offset. Align on a 4 byte boundary because the * UDF spec says so. */ ds->this_off = ds->off; if (!ds->fid_fragment) { ds->off += (total_fid_size + 3) & ~0x03; } else { ds->off = (total_fid_size - frag_size + 3) & ~0x03; } return (fid); } static void udf_closedir(struct udf_dirstream *ds) { if (ds->bp != NULL) brelse(ds->bp); if (ds->fid_fragment && ds->buf != NULL) free(ds->buf, M_UDFFID); pool_put(&udf_ds_pool, ds); } int udf_readdir(void *v) { struct vop_readdir_args *ap = v; struct vnode *vp; struct uio *uio; struct dirent dir; struct unode *up; struct umount *ump; struct fileid_desc *fid; struct udf_uiodir uiodir; struct udf_dirstream *ds; u_long *cookies = NULL; int ncookies; int error = 0; #define GENERIC_DIRSIZ(dp) \ ((sizeof (struct dirent) - (MAXNAMLEN+1)) + (((dp)->d_namlen+1 + 3) &~ 3)) vp = ap->a_vp; uio = ap->a_uio; up = VTOU(vp); ump = up->u_ump; uiodir.eofflag = 1; if (ap->a_ncookies != NULL) { /* * Guess how many entries are needed. If we run out, this * function will be called again and thing will pick up were * it left off. */ ncookies = uio->uio_resid / 8; cookies = malloc(sizeof(u_long) * ncookies, M_TEMP, M_WAITOK); uiodir.ncookies = ncookies; uiodir.cookies = cookies; uiodir.acookies = 0; } else { uiodir.cookies = NULL; } /* * Iterate through the file id descriptors. Give the parent dir * entry special attention. */ ds = udf_opendir(up, uio->uio_offset, letoh64(up->u_fentry->inf_len), up->u_ump); while ((fid = udf_getfid(ds)) != NULL) { /* Should we return an error on a bad fid? */ if (udf_checktag(&fid->tag, TAGID_FID)) { printf("Invalid FID tag\n"); error = EIO; break; } /* Is this a deleted file? */ if (fid->file_char & UDF_FILE_CHAR_DEL) continue; if ((fid->l_fi == 0) && (fid->file_char & UDF_FILE_CHAR_PAR)) { /* Do up the '.' and '..' entries. Dummy values are * used for the cookies since the offset here is * usually zero, and NFS doesn't like that value */ dir.d_fileno = up->u_ino; dir.d_type = DT_DIR; dir.d_name[0] = '.'; dir.d_name[1] = '\0'; dir.d_namlen = 1; dir.d_reclen = GENERIC_DIRSIZ(&dir); uiodir.dirent = &dir; error = udf_uiodir(&uiodir, dir.d_reclen, uio, 1); if (error) break; dir.d_fileno = udf_getid(&fid->icb); dir.d_type = DT_DIR; dir.d_name[0] = '.'; dir.d_name[1] = '.'; dir.d_name[2] = '\0'; dir.d_namlen = 2; dir.d_reclen = GENERIC_DIRSIZ(&dir); uiodir.dirent = &dir; error = udf_uiodir(&uiodir, dir.d_reclen, uio, 2); } else { dir.d_namlen = udf_transname(&fid->data[fid->l_iu], &dir.d_name[0], fid->l_fi, ump); dir.d_fileno = udf_getid(&fid->icb); dir.d_type = (fid->file_char & UDF_FILE_CHAR_DIR) ? DT_DIR : DT_UNKNOWN; dir.d_reclen = GENERIC_DIRSIZ(&dir); uiodir.dirent = &dir; error = udf_uiodir(&uiodir, dir.d_reclen, uio, ds->this_off); } if (error) { printf("uiomove returned %d\n", error); break; } } #undef GENERIC_DIRSIZ /* tell the calling layer whether we need to be called again */ *ap->a_eofflag = uiodir.eofflag; uio->uio_offset = ds->offset + ds->off; if (!error) error = ds->error; udf_closedir(ds); if (ap->a_ncookies != NULL) { if (error) free(cookies, M_TEMP); else { *ap->a_ncookies = uiodir.acookies; *ap->a_cookies = cookies; } } return (error); } /* Are there any implementations out there that do soft-links? */ int udf_readlink(void *v) { return (EOPNOTSUPP); } int udf_strategy(void *v) { struct vop_strategy_args *ap = v; struct buf *bp; struct vnode *vp; struct unode *up; int maxsize, s, error; bp = ap->a_bp; vp = bp->b_vp; up = VTOU(vp); /* cd9660 has this test reversed, but it seems more logical this way */ if (bp->b_blkno != bp->b_lblkno) { /* * Files that are embedded in the fentry don't translate well * to a block number. Reject. */ if (udf_bmap_internal(up, bp->b_lblkno * up->u_ump->um_bsize, &bp->b_lblkno, &maxsize)) { clrbuf(bp); bp->b_blkno = -1; } } else { error = VOP_BMAP(vp, bp->b_lblkno, NULL, &bp->b_blkno, NULL); if (error) { bp->b_error = error; bp->b_flags |= B_ERROR; s = splbio(); biodone(bp); splx(s); return (error); } if ((long)bp->b_blkno == -1) clrbuf(bp); } if ((long)bp->b_blkno == -1) { s = splbio(); biodone(bp); splx(s); } else { bp->b_dev = vp->v_rdev; VOCALL(up->u_devvp->v_op, VOFFSET(vop_strategy), ap); } return (0); } int udf_lock(void *v) { struct vop_lock_args *ap = v; struct vnode *vp = ap->a_vp; return (lockmgr(&VTOU(vp)->u_lock, ap->a_flags, NULL)); } int udf_unlock(void *v) { struct vop_unlock_args *ap = v; struct vnode *vp = ap->a_vp; return (lockmgr(&VTOU(vp)->u_lock, ap->a_flags | LK_RELEASE, NULL)); } int udf_islocked(void *v) { struct vop_islocked_args *ap = v; return (lockstatus(&VTOU(ap->a_vp)->u_lock)); } int udf_print(void *v) { struct vop_print_args *ap = v; struct vnode *vp = ap->a_vp; struct unode *up = VTOU(vp); /* * Complete the information given by vprint(). */ printf("tag VT_UDF, hash id %u\n", up->u_ino); #ifdef DIAGNOSTIC lockmgr_printinfo(&up->u_lock); printf("\n"); #endif return (0); } int udf_bmap(void *v) { struct vop_bmap_args *ap = v; struct unode *up; uint32_t max_size; daddr64_t lsector; int error; up = VTOU(ap->a_vp); if (ap->a_vpp != NULL) *ap->a_vpp = up->u_devvp; if (ap->a_bnp == NULL) return (0); error = udf_bmap_internal(up, ap->a_bn * up->u_ump->um_bsize, &lsector, &max_size); if (error) return (error); /* Translate logical to physical sector number */ *ap->a_bnp = lsector << (up->u_ump->um_bshift - DEV_BSHIFT); /* Punt on read-ahead for now */ if (ap->a_runp) *ap->a_runp = 0; return (0); } /* * The all powerful VOP_LOOKUP(). */ int udf_lookup(void *v) { struct vop_lookup_args *ap = v; struct vnode *dvp; struct vnode *tdp = NULL; struct vnode **vpp = ap->a_vpp; struct unode *up; struct umount *ump; struct fileid_desc *fid = NULL; struct udf_dirstream *ds; struct proc *p; u_long nameiop; u_long flags; char *nameptr; long namelen; ino_t id = 0; int offset, error = 0; int numdirpasses, fsize; extern struct nchstats nchstats; dvp = ap->a_dvp; up = VTOU(dvp); ump = up->u_ump; nameiop = ap->a_cnp->cn_nameiop; flags = ap->a_cnp->cn_flags; nameptr = ap->a_cnp->cn_nameptr; namelen = ap->a_cnp->cn_namelen; fsize = letoh64(up->u_fentry->inf_len); p = ap->a_cnp->cn_proc; *vpp = NULL; /* * Make sure the process can scan the requested directory. */ error = VOP_ACCESS(dvp, VEXEC, ap->a_cnp->cn_cred, p); if (error) return (error); /* * Check if the (directory, name) tuple has been already cached. */ error = cache_lookup(dvp, vpp, ap->a_cnp); if (error >= 0) return (error); else error = 0; /* * If dvp is what's being looked up, then return it. */ if (ap->a_cnp->cn_namelen == 1 && ap->a_cnp->cn_nameptr[0] == '.') { vref(dvp); *vpp = dvp; return (0); } /* * If this is a LOOKUP and we've already partially searched through * the directory, pick up where we left off and flag that the * directory may need to be searched twice. For a full description, * see /sys/isofs/cd9660/cd9660_lookup.c:cd9660_lookup() */ if (nameiop != LOOKUP || up->u_diroff == 0 || up->u_diroff > fsize) { offset = 0; numdirpasses = 1; } else { offset = up->u_diroff; numdirpasses = 2; nchstats.ncs_2passes++; } lookloop: ds = udf_opendir(up, offset, fsize, ump); while ((fid = udf_getfid(ds)) != NULL) { /* Check for a valid FID tag. */ if (udf_checktag(&fid->tag, TAGID_FID)) { printf("udf_lookup: Invalid tag\n"); error = EIO; break; } /* Is this a deleted file? */ if (fid->file_char & UDF_FILE_CHAR_DEL) continue; if ((fid->l_fi == 0) && (fid->file_char & UDF_FILE_CHAR_PAR)) { if (flags & ISDOTDOT) { id = udf_getid(&fid->icb); break; } } else { if (!(udf_cmpname(&fid->data[fid->l_iu], nameptr, fid->l_fi, namelen, ump))) { id = udf_getid(&fid->icb); break; } } } if (!error) error = ds->error; if (error) { udf_closedir(ds); return (error); } /* Did we have a match? */ if (id) { error = udf_vget(ump->um_mountp, id, &tdp); if (!error) { /* * Remember where this entry was if it's the final * component. */ if ((flags & ISLASTCN) && nameiop == LOOKUP) up->u_diroff = ds->offset + ds->off; if (numdirpasses == 2) nchstats.ncs_pass2++; if (!(flags & LOCKPARENT) || !(flags & ISLASTCN)) { ap->a_cnp->cn_flags |= PDIRUNLOCK; VOP_UNLOCK(dvp, 0, p); } *vpp = tdp; } } else { /* Name wasn't found on this pass. Do another pass? */ if (numdirpasses == 2) { numdirpasses--; offset = 0; udf_closedir(ds); goto lookloop; } if ((flags & ISLASTCN) && (nameiop == CREATE || nameiop == RENAME)) { error = EROFS; } else { error = ENOENT; } } /* * Cache the result of this lookup. */ if (flags & MAKEENTRY) cache_enter(dvp, *vpp, ap->a_cnp); udf_closedir(ds); return (error); } int udf_inactive(void *v) { struct vop_inactive_args *ap = v; struct vnode *vp = ap->a_vp; struct proc *p = ap->a_p; /* * No need to sync anything, so just unlock the vnode and return. */ VOP_UNLOCK(vp, 0, p); return (0); } int udf_reclaim(void *v) { struct vop_reclaim_args *ap = v; struct vnode *vp; struct unode *up; vp = ap->a_vp; up = VTOU(vp); if (up != NULL) { udf_hashrem(up); if (up->u_devvp) { vrele(up->u_devvp); up->u_devvp = 0; } if (up->u_fentry != NULL) free(up->u_fentry, M_UDFFENTRY); pool_put(&unode_pool, up); vp->v_data = NULL; } return (0); } /* * Read the block and then set the data pointer to correspond with the * offset passed in. Only read in at most 'size' bytes, and then set 'size' * to the number of bytes pointed to. If 'size' is zero, try to read in a * whole extent. * * Note that *bp may be assigned error or not. * */ int udf_readatoffset(struct unode *up, int *size, off_t offset, struct buf **bp, uint8_t **data) { struct umount *ump; struct file_entry *fentry = NULL; struct buf *bp1; uint32_t max_size; daddr64_t sector; int error; ump = up->u_ump; *bp = NULL; error = udf_bmap_internal(up, offset, §or, &max_size); if (error == UDF_INVALID_BMAP) { /* * This error means that the file *data* is stored in the * allocation descriptor field of the file entry. */ fentry = up->u_fentry; *data = &fentry->data[letoh32(fentry->l_ea)]; *size = letoh32(fentry->l_ad); return (0); } else if (error != 0) { return (error); } /* Adjust the size so that it is within range */ if (*size == 0 || *size > max_size) *size = max_size; *size = min(*size, MAXBSIZE); if ((error = udf_readlblks(ump, sector, *size, bp))) { printf("warning: udf_readlblks returned error %d\n", error); /* note: *bp may be non-NULL */ return (error); } bp1 = *bp; *data = (uint8_t *)&bp1->b_data[offset % ump->um_bsize]; return (0); } /* * Translate a file offset into a logical block and then into a physical * block. */ int udf_bmap_internal(struct unode *up, off_t offset, daddr64_t *sector, uint32_t *max_size) { struct umount *ump; struct file_entry *fentry; void *icb; struct icb_tag *tag; uint32_t icblen = 0; daddr64_t lsector; int ad_offset, ad_num = 0; int i, p_offset; ump = up->u_ump; fentry = up->u_fentry; tag = &fentry->icbtag; switch (letoh16(tag->strat_type)) { case 4: break; case 4096: printf("Cannot deal with strategy4096 yet!\n"); return (ENODEV); default: printf("Unknown strategy type %d\n", tag->strat_type); return (ENODEV); } switch (letoh16(tag->flags) & 0x7) { case 0: /* * The allocation descriptor field is filled with short_ad's. * If the offset is beyond the current extent, look for the * next extent. */ do { offset -= icblen; ad_offset = sizeof(struct short_ad) * ad_num; if (ad_offset > letoh32(fentry->l_ad)) { printf("File offset out of bounds\n"); return (EINVAL); } icb = GETICB(short_ad, fentry, letoh32(fentry->l_ea) + ad_offset); icblen = GETICBLEN(short_ad, icb); ad_num++; } while(offset >= icblen); lsector = (offset >> ump->um_bshift) + letoh32(((struct short_ad *)(icb))->lb_num); *max_size = GETICBLEN(short_ad, icb); break; case 1: /* * The allocation descriptor field is filled with long_ad's * If the offset is beyond the current extent, look for the * next extent. */ do { offset -= icblen; ad_offset = sizeof(struct long_ad) * ad_num; if (ad_offset > letoh32(fentry->l_ad)) { printf("File offset out of bounds\n"); return (EINVAL); } icb = GETICB(long_ad, fentry, letoh32(fentry->l_ea) + ad_offset); icblen = GETICBLEN(long_ad, icb); ad_num++; } while(offset >= icblen); lsector = (offset >> ump->um_bshift) + letoh32(((struct long_ad *)(icb))->loc.lb_num); *max_size = GETICBLEN(long_ad, icb); break; case 3: /* * This type means that the file *data* is stored in the * allocation descriptor field of the file entry. */ *max_size = 0; *sector = up->u_ino + ump->um_start; return (UDF_INVALID_BMAP); case 2: /* DirectCD does not use extended_ad's */ default: printf("Unsupported allocation descriptor %d\n", tag->flags & 0x7); return (ENODEV); } *sector = lsector + ump->um_start; /* * Check the sparing table. Each entry represents the beginning of * a packet. */ if (ump->um_stbl != NULL) { for (i = 0; i< ump->um_stbl_len; i++) { p_offset = lsector - letoh32(ump->um_stbl->entries[i].org); if ((p_offset < ump->um_psecs) && (p_offset >= 0)) { *sector = letoh32(ump->um_stbl->entries[i].map) + p_offset; break; } } } return (0); }