The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/fs/udf/udf_vnops.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2001, 2002 Scott Long <scottl@freebsd.org>
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  *
   28  * $FreeBSD$
   29  */
   30 
   31 /* udf_vnops.c */
   32 /* Take care of the vnode side of things */
   33 
   34 #include <sys/param.h>
   35 #include <sys/systm.h>
   36 #include <sys/namei.h>
   37 #include <sys/kernel.h>
   38 #include <sys/malloc.h>
   39 #include <sys/stat.h>
   40 #include <sys/bio.h>
   41 #include <sys/conf.h>
   42 #include <sys/buf.h>
   43 #include <sys/iconv.h>
   44 #include <sys/mount.h>
   45 #include <sys/vnode.h>
   46 #include <sys/dirent.h>
   47 #include <sys/queue.h>
   48 #include <sys/unistd.h>
   49 #include <sys/endian.h>
   50 
   51 #include <vm/uma.h>
   52 
   53 #include <fs/udf/ecma167-udf.h>
   54 #include <fs/udf/osta.h>
   55 #include <fs/udf/udf.h>
   56 #include <fs/udf/udf_mount.h>
   57 
   58 extern struct iconv_functions *udf_iconv;
   59 
   60 static vop_access_t     udf_access;
   61 static vop_getattr_t    udf_getattr;
   62 static vop_open_t       udf_open;
   63 static vop_ioctl_t      udf_ioctl;
   64 static vop_pathconf_t   udf_pathconf;
   65 static vop_print_t      udf_print;
   66 static vop_read_t       udf_read;
   67 static vop_readdir_t    udf_readdir;
   68 static vop_readlink_t   udf_readlink;
   69 static vop_setattr_t    udf_setattr;
   70 static vop_strategy_t   udf_strategy;
   71 static vop_bmap_t       udf_bmap;
   72 static vop_cachedlookup_t       udf_lookup;
   73 static vop_reclaim_t    udf_reclaim;
   74 static vop_vptofh_t     udf_vptofh;
   75 static int udf_readatoffset(struct udf_node *node, int *size, off_t offset,
   76     struct buf **bp, uint8_t **data);
   77 static int udf_bmap_internal(struct udf_node *node, off_t offset,
   78     daddr_t *sector, uint32_t *max_size);
   79 
   80 static struct vop_vector udf_vnodeops = {
   81         .vop_default =          &default_vnodeops,
   82 
   83         .vop_access =           udf_access,
   84         .vop_bmap =             udf_bmap,
   85         .vop_cachedlookup =     udf_lookup,
   86         .vop_getattr =          udf_getattr,
   87         .vop_ioctl =            udf_ioctl,
   88         .vop_lookup =           vfs_cache_lookup,
   89         .vop_open =             udf_open,
   90         .vop_pathconf =         udf_pathconf,
   91         .vop_print =            udf_print,
   92         .vop_read =             udf_read,
   93         .vop_readdir =          udf_readdir,
   94         .vop_readlink =         udf_readlink,
   95         .vop_reclaim =          udf_reclaim,
   96         .vop_setattr =          udf_setattr,
   97         .vop_strategy =         udf_strategy,
   98         .vop_vptofh =           udf_vptofh,
   99 };
  100 VFS_VOP_VECTOR_REGISTER(udf_vnodeops);
  101 
  102 struct vop_vector udf_fifoops = {
  103         .vop_default =          &fifo_specops,
  104         .vop_access =           udf_access,
  105         .vop_getattr =          udf_getattr,
  106         .vop_pathconf =         udf_pathconf,
  107         .vop_print =            udf_print,
  108         .vop_reclaim =          udf_reclaim,
  109         .vop_setattr =          udf_setattr,
  110         .vop_vptofh =           udf_vptofh,
  111 };
  112 VFS_VOP_VECTOR_REGISTER(udf_fifoops);
  113 
  114 static MALLOC_DEFINE(M_UDFFID, "udf_fid", "UDF FileId structure");
  115 static MALLOC_DEFINE(M_UDFDS, "udf_ds", "UDF Dirstream structure");
  116 
  117 #define UDF_INVALID_BMAP        -1
  118 
  119 int
  120 udf_allocv(struct mount *mp, struct vnode **vpp, struct thread *td)
  121 {
  122         int error;
  123         struct vnode *vp;
  124 
  125         error = getnewvnode("udf", mp, &udf_vnodeops, &vp);
  126         if (error) {
  127                 printf("udf_allocv: failed to allocate new vnode\n");
  128                 return (error);
  129         }
  130 
  131         *vpp = vp;
  132         return (0);
  133 }
  134 
  135 /* Convert file entry permission (5 bits per owner/group/user) to a mode_t */
  136 static mode_t
  137 udf_permtomode(struct udf_node *node)
  138 {
  139         uint32_t perm;
  140         uint16_t flags;
  141         mode_t mode;
  142 
  143         perm = le32toh(node->fentry->perm);
  144         flags = le16toh(node->fentry->icbtag.flags);
  145 
  146         mode = perm & UDF_FENTRY_PERM_USER_MASK;
  147         mode |= ((perm & UDF_FENTRY_PERM_GRP_MASK) >> 2);
  148         mode |= ((perm & UDF_FENTRY_PERM_OWNER_MASK) >> 4);
  149         mode |= ((flags & UDF_ICB_TAG_FLAGS_STICKY) << 4);
  150         mode |= ((flags & UDF_ICB_TAG_FLAGS_SETGID) << 6);
  151         mode |= ((flags & UDF_ICB_TAG_FLAGS_SETUID) << 8);
  152 
  153         return (mode);
  154 }
  155 
  156 static int
  157 udf_access(struct vop_access_args *a)
  158 {
  159         struct vnode *vp;
  160         struct udf_node *node;
  161         accmode_t accmode;
  162         mode_t mode;
  163 
  164         vp = a->a_vp;
  165         node = VTON(vp);
  166         accmode = a->a_accmode;
  167 
  168         if (accmode & VWRITE) {
  169                 switch (vp->v_type) {
  170                 case VDIR:
  171                 case VLNK:
  172                 case VREG:
  173                         return (EROFS);
  174                         /* NOT REACHED */
  175                 default:
  176                         break;
  177                 }
  178         }
  179 
  180         mode = udf_permtomode(node);
  181 
  182         return (vaccess(vp->v_type, mode, node->fentry->uid, node->fentry->gid,
  183             accmode, a->a_cred));
  184 }
  185 
  186 static int
  187 udf_open(struct vop_open_args *ap) {
  188         struct udf_node *np = VTON(ap->a_vp);
  189         off_t fsize;
  190 
  191         fsize = le64toh(np->fentry->inf_len);
  192         vnode_create_vobject(ap->a_vp, fsize, ap->a_td);
  193         return 0;
  194 }
  195 
  196 static const int mon_lens[2][12] = {
  197         {0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334},
  198         {0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335}
  199 };
  200 
  201 static int
  202 udf_isaleapyear(int year)
  203 {
  204         int i;
  205 
  206         i = (year % 4) ? 0 : 1;
  207         i &= (year % 100) ? 1 : 0;
  208         i |= (year % 400) ? 0 : 1;
  209 
  210         return i;
  211 }
  212 
  213 /*
  214  * Timezone calculation compliments of Julian Elischer <julian@elischer.org>.
  215  */
  216 static void
  217 udf_timetotimespec(struct timestamp *time, struct timespec *t)
  218 {
  219         int i, lpyear, daysinyear, year, startyear;
  220         union {
  221                 uint16_t        u_tz_offset;
  222                 int16_t         s_tz_offset;
  223         } tz;
  224 
  225         /*
  226          * DirectCD seems to like using bogus year values.
  227          * Don't trust time->month as it will be used for an array index.
  228          */
  229         year = le16toh(time->year);
  230         if (year < 1970 || time->month < 1 || time->month > 12) {
  231                 t->tv_sec = 0;
  232                 t->tv_nsec = 0;
  233                 return;
  234         }
  235 
  236         /* Calculate the time and day */
  237         t->tv_sec = time->second;
  238         t->tv_sec += time->minute * 60;
  239         t->tv_sec += time->hour * 3600;
  240         t->tv_sec += (time->day - 1) * 3600 * 24;
  241 
  242         /* Calculate the month */
  243         lpyear = udf_isaleapyear(year);
  244         t->tv_sec += mon_lens[lpyear][time->month - 1] * 3600 * 24;
  245 
  246         /* Speed up the calculation */
  247         startyear = 1970;
  248         if (year > 2009) {
  249                 t->tv_sec += 1262304000;
  250                 startyear += 40;
  251         } else if (year > 1999) {
  252                 t->tv_sec += 946684800;
  253                 startyear += 30;
  254         } else if (year > 1989) {
  255                 t->tv_sec += 631152000;
  256                 startyear += 20;
  257         } else if (year > 1979) {
  258                 t->tv_sec += 315532800;
  259                 startyear += 10;
  260         }
  261 
  262         daysinyear = (year - startyear) * 365;
  263         for (i = startyear; i < year; i++)
  264                 daysinyear += udf_isaleapyear(i);
  265         t->tv_sec += daysinyear * 3600 * 24;
  266 
  267         /* Calculate microseconds */
  268         t->tv_nsec = time->centisec * 10000 + time->hund_usec * 100 +
  269             time->usec;
  270 
  271         /*
  272          * Calculate the time zone.  The timezone is 12 bit signed 2's
  273          * complement, so we gotta do some extra magic to handle it right.
  274          */
  275         tz.u_tz_offset = le16toh(time->type_tz);
  276         tz.u_tz_offset &= 0x0fff;
  277         if (tz.u_tz_offset & 0x0800)
  278                 tz.u_tz_offset |= 0xf000;       /* extend the sign to 16 bits */
  279         if ((le16toh(time->type_tz) & 0x1000) && (tz.s_tz_offset != -2047))
  280                 t->tv_sec -= tz.s_tz_offset * 60;
  281 
  282         return;
  283 }
  284 
  285 static int
  286 udf_getattr(struct vop_getattr_args *a)
  287 {
  288         struct vnode *vp;
  289         struct udf_node *node;
  290         struct vattr *vap;
  291         struct file_entry *fentry;
  292         struct timespec ts;
  293 
  294         ts.tv_sec = 0;
  295 
  296         vp = a->a_vp;
  297         vap = a->a_vap;
  298         node = VTON(vp);
  299         fentry = node->fentry;
  300 
  301         vap->va_fsid = dev2udev(node->udfmp->im_dev);
  302         vap->va_fileid = node->hash_id;
  303         vap->va_mode = udf_permtomode(node);
  304         vap->va_nlink = le16toh(fentry->link_cnt);
  305         /*
  306          * XXX The spec says that -1 is valid for uid/gid and indicates an
  307          * invalid uid/gid.  How should this be represented?
  308          */
  309         vap->va_uid = (le32toh(fentry->uid) == -1) ? 0 : le32toh(fentry->uid);
  310         vap->va_gid = (le32toh(fentry->gid) == -1) ? 0 : le32toh(fentry->gid);
  311         udf_timetotimespec(&fentry->atime, &vap->va_atime);
  312         udf_timetotimespec(&fentry->mtime, &vap->va_mtime);
  313         vap->va_ctime = vap->va_mtime; /* XXX Stored as an Extended Attribute */
  314         vap->va_rdev = NODEV;
  315         if (vp->v_type & VDIR) {
  316                 /*
  317                  * Directories that are recorded within their ICB will show
  318                  * as having 0 blocks recorded.  Since tradition dictates
  319                  * that directories consume at least one logical block,
  320                  * make it appear so.
  321                  */
  322                 if (fentry->logblks_rec != 0) {
  323                         vap->va_size =
  324                             le64toh(fentry->logblks_rec) * node->udfmp->bsize;
  325                 } else {
  326                         vap->va_size = node->udfmp->bsize;
  327                 }
  328         } else {
  329                 vap->va_size = le64toh(fentry->inf_len);
  330         }
  331         vap->va_flags = 0;
  332         vap->va_gen = 1;
  333         vap->va_blocksize = node->udfmp->bsize;
  334         vap->va_bytes = le64toh(fentry->inf_len);
  335         vap->va_type = vp->v_type;
  336         vap->va_filerev = 0; /* XXX */
  337         return (0);
  338 }
  339 
  340 static int
  341 udf_setattr(struct vop_setattr_args *a)
  342 {
  343         struct vnode *vp;
  344         struct vattr *vap;
  345 
  346         vp = a->a_vp;
  347         vap = a->a_vap;
  348         if (vap->va_flags != (u_long)VNOVAL || vap->va_uid != (uid_t)VNOVAL ||
  349             vap->va_gid != (gid_t)VNOVAL || vap->va_atime.tv_sec != VNOVAL ||
  350             vap->va_mtime.tv_sec != VNOVAL || vap->va_mode != (mode_t)VNOVAL)
  351                 return (EROFS);
  352         if (vap->va_size != (u_quad_t)VNOVAL) {
  353                 switch (vp->v_type) {
  354                 case VDIR:
  355                         return (EISDIR);
  356                 case VLNK:
  357                 case VREG:
  358                         return (EROFS);
  359                 case VCHR:
  360                 case VBLK:
  361                 case VSOCK:
  362                 case VFIFO:
  363                 case VNON:
  364                 case VBAD:
  365                 case VMARKER:
  366                         return (0);
  367                 }
  368         }
  369         return (0);
  370 }
  371 
  372 /*
  373  * File specific ioctls.
  374  */
  375 static int
  376 udf_ioctl(struct vop_ioctl_args *a)
  377 {
  378         printf("%s called\n", __func__);
  379         return (ENOTTY);
  380 }
  381 
  382 /*
  383  * I'm not sure that this has much value in a read-only filesystem, but
  384  * cd9660 has it too.
  385  */
  386 static int
  387 udf_pathconf(struct vop_pathconf_args *a)
  388 {
  389 
  390         switch (a->a_name) {
  391         case _PC_FILESIZEBITS:
  392                 *a->a_retval = 64;
  393                 return (0);
  394         case _PC_LINK_MAX:
  395                 *a->a_retval = 65535;
  396                 return (0);
  397         case _PC_NAME_MAX:
  398                 *a->a_retval = NAME_MAX;
  399                 return (0);
  400         case _PC_SYMLINK_MAX:
  401                 *a->a_retval = MAXPATHLEN;
  402                 return (0);
  403         case _PC_NO_TRUNC:
  404                 *a->a_retval = 1;
  405                 return (0);
  406         case _PC_PIPE_BUF:
  407                 if (a->a_vp->v_type == VDIR || a->a_vp->v_type == VFIFO) {
  408                         *a->a_retval = PIPE_BUF;
  409                         return (0);
  410                 }
  411                 return (EINVAL);
  412         default:
  413                 return (vop_stdpathconf(a));
  414         }
  415 }
  416 
  417 static int
  418 udf_print(struct vop_print_args *ap)
  419 {
  420         struct vnode *vp = ap->a_vp;
  421         struct udf_node *node = VTON(vp);
  422 
  423         printf("    ino %lu, on dev %s", (u_long)node->hash_id,
  424             devtoname(node->udfmp->im_dev));
  425         if (vp->v_type == VFIFO)
  426                 fifo_printinfo(vp);
  427         printf("\n");
  428         return (0);
  429 }
  430 
  431 #define lblkno(udfmp, loc)      ((loc) >> (udfmp)->bshift)
  432 #define blkoff(udfmp, loc)      ((loc) & (udfmp)->bmask)
  433 #define lblktosize(udfmp, blk)  ((blk) << (udfmp)->bshift)
  434 
  435 static inline int
  436 is_data_in_fentry(const struct udf_node *node)
  437 {
  438         const struct file_entry *fentry = node->fentry;
  439 
  440         return ((le16toh(fentry->icbtag.flags) & 0x7) == 3);
  441 }
  442 
  443 static int
  444 udf_read(struct vop_read_args *ap)
  445 {
  446         struct vnode *vp = ap->a_vp;
  447         struct uio *uio = ap->a_uio;
  448         struct udf_node *node = VTON(vp);
  449         struct udf_mnt *udfmp;
  450         struct file_entry *fentry;
  451         struct buf *bp;
  452         uint8_t *data;
  453         daddr_t lbn, rablock;
  454         off_t diff, fsize;
  455         ssize_t n;
  456         int error = 0;
  457         long size, on;
  458 
  459         if (uio->uio_resid == 0)
  460                 return (0);
  461         if (uio->uio_offset < 0)
  462                 return (EINVAL);
  463 
  464         if (is_data_in_fentry(node)) {
  465                 fentry = node->fentry;
  466                 data = &fentry->data[le32toh(fentry->l_ea)];
  467                 fsize = le32toh(fentry->l_ad);
  468 
  469                 n = uio->uio_resid;
  470                 diff = fsize - uio->uio_offset;
  471                 if (diff <= 0)
  472                         return (0);
  473                 if (diff < n)
  474                         n = diff;
  475                 error = uiomove(data + uio->uio_offset, (int)n, uio);
  476                 return (error);
  477         }
  478 
  479         fsize = le64toh(node->fentry->inf_len);
  480         udfmp = node->udfmp;
  481         do {
  482                 lbn = lblkno(udfmp, uio->uio_offset);
  483                 on = blkoff(udfmp, uio->uio_offset);
  484                 n = min((u_int)(udfmp->bsize - on),
  485                         uio->uio_resid);
  486                 diff = fsize - uio->uio_offset;
  487                 if (diff <= 0)
  488                         return (0);
  489                 if (diff < n)
  490                         n = diff;
  491                 size = udfmp->bsize;
  492                 rablock = lbn + 1;
  493                 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERR) == 0) {
  494                         if (lblktosize(udfmp, rablock) < fsize) {
  495                                 error = cluster_read(vp, fsize, lbn, size,
  496                                     NOCRED, uio->uio_resid,
  497                                     (ap->a_ioflag >> 16), 0, &bp);
  498                         } else {
  499                                 error = bread(vp, lbn, size, NOCRED, &bp);
  500                         }
  501                 } else {
  502                         error = bread(vp, lbn, size, NOCRED, &bp);
  503                 }
  504                 if (error != 0) {
  505                         brelse(bp);
  506                         return (error);
  507                 }
  508                 n = min(n, size - bp->b_resid);
  509 
  510                 error = uiomove(bp->b_data + on, (int)n, uio);
  511                 brelse(bp);
  512         } while (error == 0 && uio->uio_resid > 0 && n != 0);
  513         return (error);
  514 }
  515 
  516 /*
  517  * Call the OSTA routines to translate the name from a CS0 dstring to a
  518  * 16-bit Unicode String.  Hooks need to be placed in here to translate from
  519  * Unicode to the encoding that the kernel/user expects.  Return the length
  520  * of the translated string.
  521  */
  522 static int
  523 udf_transname(char *cs0string, char *destname, int len, struct udf_mnt *udfmp)
  524 {
  525         unicode_t *transname;
  526         char *unibuf, *unip;
  527         int i, destlen;
  528         ssize_t unilen = 0;
  529         size_t destleft = MAXNAMLEN;
  530 
  531         /* Convert 16-bit Unicode to destname */
  532         if (udfmp->im_flags & UDFMNT_KICONV && udf_iconv) {
  533                 /* allocate a buffer big enough to hold an 8->16 bit expansion */
  534                 unibuf = uma_zalloc(udf_zone_trans, M_WAITOK);
  535                 unip = unibuf;
  536                 if ((unilen = (ssize_t)udf_UncompressUnicodeByte(len, cs0string, unibuf)) == -1) {
  537                         printf("udf: Unicode translation failed\n");
  538                         uma_zfree(udf_zone_trans, unibuf);
  539                         return 0;
  540                 }
  541 
  542                 while (unilen > 0 && destleft > 0) {
  543                         udf_iconv->conv(udfmp->im_d2l, __DECONST(const char **,
  544                             &unibuf), (size_t *)&unilen, (char **)&destname,
  545                             &destleft);
  546                         /* Unconverted character found */
  547                         if (unilen > 0 && destleft > 0) {
  548                                 *destname++ = '?';
  549                                 destleft--;
  550                                 unibuf += 2;
  551                                 unilen -= 2;
  552                         }
  553                 }
  554                 uma_zfree(udf_zone_trans, unip);
  555                 *destname = '\0';
  556                 destlen = MAXNAMLEN - (int)destleft;
  557         } else {
  558                 /* allocate a buffer big enough to hold an 8->16 bit expansion */
  559                 transname = uma_zalloc(udf_zone_trans, M_WAITOK);
  560 
  561                 if ((unilen = (ssize_t)udf_UncompressUnicode(len, cs0string, transname)) == -1) {
  562                         printf("udf: Unicode translation failed\n");
  563                         uma_zfree(udf_zone_trans, transname);
  564                         return 0;
  565                 }
  566 
  567                 for (i = 0; i < unilen ; i++) {
  568                         if (transname[i] & 0xff00) {
  569                                 destname[i] = '.';      /* Fudge the 16bit chars */
  570                         } else {
  571                                 destname[i] = transname[i] & 0xff;
  572                         }
  573                 }
  574                 uma_zfree(udf_zone_trans, transname);
  575                 destname[unilen] = 0;
  576                 destlen = (int)unilen;
  577         }
  578 
  579         return (destlen);
  580 }
  581 
  582 /*
  583  * Compare a CS0 dstring with a name passed in from the VFS layer.  Return
  584  * 0 on a successful match, nonzero otherwise.  Unicode work may need to be done
  585  * here also.
  586  */
  587 static int
  588 udf_cmpname(char *cs0string, char *cmpname, int cs0len, int cmplen, struct udf_mnt *udfmp)
  589 {
  590         char *transname;
  591         int error = 0;
  592 
  593         /* This is overkill, but not worth creating a new zone */
  594         transname = uma_zalloc(udf_zone_trans, M_WAITOK);
  595 
  596         cs0len = udf_transname(cs0string, transname, cs0len, udfmp);
  597 
  598         /* Easy check.  If they aren't the same length, they aren't equal */
  599         if ((cs0len == 0) || (cs0len != cmplen))
  600                 error = -1;
  601         else
  602                 error = bcmp(transname, cmpname, cmplen);
  603 
  604         uma_zfree(udf_zone_trans, transname);
  605         return (error);
  606 }
  607 
  608 struct udf_uiodir {
  609         struct dirent *dirent;
  610         u_long *cookies;
  611         int ncookies;
  612         int acookies;
  613         int eofflag;
  614 };
  615 
  616 static int
  617 udf_uiodir(struct udf_uiodir *uiodir, int de_size, struct uio *uio, long cookie)
  618 {
  619         if (uiodir->cookies != NULL) {
  620                 if (++uiodir->acookies > uiodir->ncookies) {
  621                         uiodir->eofflag = 0;
  622                         return (-1);
  623                 }
  624                 *uiodir->cookies++ = cookie;
  625         }
  626 
  627         if (uio->uio_resid < de_size) {
  628                 uiodir->eofflag = 0;
  629                 return (-1);
  630         }
  631 
  632         return (uiomove(uiodir->dirent, de_size, uio));
  633 }
  634 
  635 static struct udf_dirstream *
  636 udf_opendir(struct udf_node *node, int offset, int fsize, struct udf_mnt *udfmp)
  637 {
  638         struct udf_dirstream *ds;
  639 
  640         ds = uma_zalloc(udf_zone_ds, M_WAITOK | M_ZERO);
  641 
  642         ds->node = node;
  643         ds->offset = offset;
  644         ds->udfmp = udfmp;
  645         ds->fsize = fsize;
  646 
  647         return (ds);
  648 }
  649 
  650 static struct fileid_desc *
  651 udf_getfid(struct udf_dirstream *ds)
  652 {
  653         struct fileid_desc *fid;
  654         int error, frag_size = 0, total_fid_size;
  655 
  656         /* End of directory? */
  657         if (ds->offset + ds->off >= ds->fsize) {
  658                 ds->error = 0;
  659                 return (NULL);
  660         }
  661 
  662         /* Grab the first extent of the directory */
  663         if (ds->off == 0) {
  664                 ds->size = 0;
  665                 error = udf_readatoffset(ds->node, &ds->size, ds->offset,
  666                     &ds->bp, &ds->data);
  667                 if (error) {
  668                         ds->error = error;
  669                         if (ds->bp != NULL)
  670                                 brelse(ds->bp);
  671                         return (NULL);
  672                 }
  673         }
  674 
  675         /*
  676          * Clean up from a previous fragmented FID.
  677          * XXX Is this the right place for this?
  678          */
  679         if (ds->fid_fragment && ds->buf != NULL) {
  680                 ds->fid_fragment = 0;
  681                 free(ds->buf, M_UDFFID);
  682         }
  683 
  684         fid = (struct fileid_desc*)&ds->data[ds->off];
  685 
  686         /*
  687          * Check to see if the fid is fragmented. The first test
  688          * ensures that we don't wander off the end of the buffer
  689          * looking for the l_iu and l_fi fields.
  690          */
  691         if (ds->off + UDF_FID_SIZE > ds->size ||
  692             ds->off + le16toh(fid->l_iu) + fid->l_fi + UDF_FID_SIZE > ds->size){
  693                 /* Copy what we have of the fid into a buffer */
  694                 frag_size = ds->size - ds->off;
  695                 if (frag_size >= ds->udfmp->bsize) {
  696                         printf("udf: invalid FID fragment\n");
  697                         ds->error = EINVAL;
  698                         return (NULL);
  699                 }
  700 
  701                 /*
  702                  * File ID descriptors can only be at most one
  703                  * logical sector in size.
  704                  */
  705                 ds->buf = malloc(ds->udfmp->bsize, M_UDFFID,
  706                      M_WAITOK | M_ZERO);
  707                 bcopy(fid, ds->buf, frag_size);
  708 
  709                 /* Reduce all of the casting magic */
  710                 fid = (struct fileid_desc*)ds->buf;
  711 
  712                 if (ds->bp != NULL)
  713                         brelse(ds->bp);
  714 
  715                 /* Fetch the next allocation */
  716                 ds->offset += ds->size;
  717                 ds->size = 0;
  718                 error = udf_readatoffset(ds->node, &ds->size, ds->offset,
  719                     &ds->bp, &ds->data);
  720                 if (error) {
  721                         ds->error = error;
  722                         return (NULL);
  723                 }
  724 
  725                 /*
  726                  * If the fragment was so small that we didn't get
  727                  * the l_iu and l_fi fields, copy those in.
  728                  */
  729                 if (frag_size < UDF_FID_SIZE)
  730                         bcopy(ds->data, &ds->buf[frag_size],
  731                             UDF_FID_SIZE - frag_size);
  732 
  733                 /*
  734                  * Now that we have enough of the fid to work with,
  735                  * copy in the rest of the fid from the new
  736                  * allocation.
  737                  */
  738                 total_fid_size = UDF_FID_SIZE + le16toh(fid->l_iu) + fid->l_fi;
  739                 if (total_fid_size > ds->udfmp->bsize) {
  740                         printf("udf: invalid FID\n");
  741                         ds->error = EIO;
  742                         return (NULL);
  743                 }
  744                 bcopy(ds->data, &ds->buf[frag_size],
  745                     total_fid_size - frag_size);
  746 
  747                 ds->fid_fragment = 1;
  748         } else {
  749                 total_fid_size = le16toh(fid->l_iu) + fid->l_fi + UDF_FID_SIZE;
  750         }
  751 
  752         /*
  753          * Update the offset. Align on a 4 byte boundary because the
  754          * UDF spec says so.
  755          */
  756         ds->this_off = ds->offset + ds->off;
  757         if (!ds->fid_fragment) {
  758                 ds->off += (total_fid_size + 3) & ~0x03;
  759         } else {
  760                 ds->off = (total_fid_size - frag_size + 3) & ~0x03;
  761         }
  762 
  763         return (fid);
  764 }
  765 
  766 static void
  767 udf_closedir(struct udf_dirstream *ds)
  768 {
  769 
  770         if (ds->bp != NULL)
  771                 brelse(ds->bp);
  772 
  773         if (ds->fid_fragment && ds->buf != NULL)
  774                 free(ds->buf, M_UDFFID);
  775 
  776         uma_zfree(udf_zone_ds, ds);
  777 }
  778 
  779 static int
  780 udf_readdir(struct vop_readdir_args *a)
  781 {
  782         struct vnode *vp;
  783         struct uio *uio;
  784         struct dirent dir;
  785         struct udf_node *node;
  786         struct udf_mnt *udfmp;
  787         struct fileid_desc *fid;
  788         struct udf_uiodir uiodir;
  789         struct udf_dirstream *ds;
  790         u_long *cookies = NULL;
  791         int ncookies;
  792         int error = 0;
  793 
  794         vp = a->a_vp;
  795         uio = a->a_uio;
  796         node = VTON(vp);
  797         udfmp = node->udfmp;
  798         uiodir.eofflag = 1;
  799 
  800         if (a->a_ncookies != NULL) {
  801                 /*
  802                  * Guess how many entries are needed.  If we run out, this
  803                  * function will be called again and thing will pick up were
  804                  * it left off.
  805                  */
  806                 ncookies = uio->uio_resid / 8;
  807                 cookies = malloc(sizeof(u_long) * ncookies,
  808                     M_TEMP, M_WAITOK);
  809                 if (cookies == NULL)
  810                         return (ENOMEM);
  811                 uiodir.ncookies = ncookies;
  812                 uiodir.cookies = cookies;
  813                 uiodir.acookies = 0;
  814         } else {
  815                 uiodir.cookies = NULL;
  816         }
  817 
  818         /*
  819          * Iterate through the file id descriptors.  Give the parent dir
  820          * entry special attention.
  821          */
  822         ds = udf_opendir(node, uio->uio_offset, le64toh(node->fentry->inf_len),
  823             node->udfmp);
  824 
  825         while ((fid = udf_getfid(ds)) != NULL) {
  826                 /* XXX Should we return an error on a bad fid? */
  827                 if (udf_checktag(&fid->tag, TAGID_FID)) {
  828                         printf("Invalid FID tag\n");
  829                         hexdump(fid, UDF_FID_SIZE, NULL, 0);
  830                         error = EIO;
  831                         break;
  832                 }
  833 
  834                 /* Is this a deleted file? */
  835                 if (fid->file_char & UDF_FILE_CHAR_DEL)
  836                         continue;
  837 
  838                 if ((fid->l_fi == 0) && (fid->file_char & UDF_FILE_CHAR_PAR)) {
  839                         /* Do up the '.' and '..' entries.  Dummy values are
  840                          * used for the cookies since the offset here is
  841                          * usually zero, and NFS doesn't like that value
  842                          */
  843                         dir.d_fileno = node->hash_id;
  844                         dir.d_type = DT_DIR;
  845                         dir.d_name[0] = '.';
  846                         dir.d_namlen = 1;
  847                         dir.d_reclen = GENERIC_DIRSIZ(&dir);
  848                         dir.d_off = 1;
  849                         dirent_terminate(&dir);
  850                         uiodir.dirent = &dir;
  851                         error = udf_uiodir(&uiodir, dir.d_reclen, uio, 1);
  852                         if (error)
  853                                 break;
  854 
  855                         dir.d_fileno = udf_getid(&fid->icb);
  856                         dir.d_type = DT_DIR;
  857                         dir.d_name[0] = '.';
  858                         dir.d_name[1] = '.';
  859                         dir.d_namlen = 2;
  860                         dir.d_reclen = GENERIC_DIRSIZ(&dir);
  861                         dir.d_off = 2;
  862                         dirent_terminate(&dir);
  863                         uiodir.dirent = &dir;
  864                         error = udf_uiodir(&uiodir, dir.d_reclen, uio, 2);
  865                 } else {
  866                         dir.d_namlen = udf_transname(&fid->data[fid->l_iu],
  867                             &dir.d_name[0], fid->l_fi, udfmp);
  868                         dir.d_fileno = udf_getid(&fid->icb);
  869                         dir.d_type = (fid->file_char & UDF_FILE_CHAR_DIR) ?
  870                             DT_DIR : DT_UNKNOWN;
  871                         dir.d_reclen = GENERIC_DIRSIZ(&dir);
  872                         dir.d_off = ds->this_off;
  873                         dirent_terminate(&dir);
  874                         uiodir.dirent = &dir;
  875                         error = udf_uiodir(&uiodir, dir.d_reclen, uio,
  876                             ds->this_off);
  877                 }
  878                 if (error)
  879                         break;
  880                 uio->uio_offset = ds->offset + ds->off;
  881         }
  882 
  883         /* tell the calling layer whether we need to be called again */
  884         *a->a_eofflag = uiodir.eofflag;
  885 
  886         if (error < 0)
  887                 error = 0;
  888         if (!error)
  889                 error = ds->error;
  890 
  891         udf_closedir(ds);
  892 
  893         if (a->a_ncookies != NULL) {
  894                 if (error)
  895                         free(cookies, M_TEMP);
  896                 else {
  897                         *a->a_ncookies = uiodir.acookies;
  898                         *a->a_cookies = cookies;
  899                 }
  900         }
  901 
  902         return (error);
  903 }
  904 
  905 static int
  906 udf_readlink(struct vop_readlink_args *ap)
  907 {
  908         struct path_component *pc, *end;
  909         struct vnode *vp;
  910         struct uio uio;
  911         struct iovec iov[1];
  912         struct udf_node *node;
  913         void *buf;
  914         char *cp;
  915         int error, len, root;
  916 
  917         /*
  918          * A symbolic link in UDF is a list of variable-length path
  919          * component structures.  We build a pathname in the caller's
  920          * uio by traversing this list.
  921          */
  922         vp = ap->a_vp;
  923         node = VTON(vp);
  924         len = le64toh(node->fentry->inf_len);
  925         buf = malloc(len, M_DEVBUF, M_WAITOK);
  926         iov[0].iov_len = len;
  927         iov[0].iov_base = buf;
  928         uio.uio_iov = iov;
  929         uio.uio_iovcnt = 1;
  930         uio.uio_offset = 0;
  931         uio.uio_resid = iov[0].iov_len;
  932         uio.uio_segflg = UIO_SYSSPACE;
  933         uio.uio_rw = UIO_READ;
  934         uio.uio_td = curthread;
  935         error = VOP_READ(vp, &uio, 0, ap->a_cred);
  936         if (error)
  937                 goto error;
  938 
  939         pc = buf;
  940         end = (void *)((char *)buf + len);
  941         root = 0;
  942         while (pc < end) {
  943                 switch (pc->type) {
  944                 case UDF_PATH_ROOT:
  945                         /* Only allow this at the beginning of a path. */
  946                         if ((void *)pc != buf) {
  947                                 error = EINVAL;
  948                                 goto error;
  949                         }
  950                         cp = "/";
  951                         len = 1;
  952                         root = 1;
  953                         break;
  954                 case UDF_PATH_DOT:
  955                         cp = ".";
  956                         len = 1;
  957                         break;
  958                 case UDF_PATH_DOTDOT:
  959                         cp = "..";
  960                         len = 2;
  961                         break;
  962                 case UDF_PATH_PATH:
  963                         if (pc->length == 0) {
  964                                 error = EINVAL;
  965                                 goto error;
  966                         }
  967                         /*
  968                          * XXX: We only support CS8 which appears to map
  969                          * to ASCII directly.
  970                          */
  971                         switch (pc->identifier[0]) {
  972                         case 8:
  973                                 cp = pc->identifier + 1;
  974                                 len = pc->length - 1;
  975                                 break;
  976                         default:
  977                                 error = EOPNOTSUPP;
  978                                 goto error;
  979                         }
  980                         break;
  981                 default:
  982                         error = EINVAL;
  983                         goto error;
  984                 }
  985 
  986                 /*
  987                  * If this is not the first component, insert a path
  988                  * separator.
  989                  */
  990                 if (pc != buf) {
  991                         /* If we started with root we already have a "/". */
  992                         if (root)
  993                                 goto skipslash;
  994                         root = 0;
  995                         if (ap->a_uio->uio_resid < 1) {
  996                                 error = ENAMETOOLONG;
  997                                 goto error;
  998                         }
  999                         error = uiomove("/", 1, ap->a_uio);
 1000                         if (error)
 1001                                 break;
 1002                 }
 1003         skipslash:
 1004 
 1005                 /* Append string at 'cp' of length 'len' to our path. */
 1006                 if (len > ap->a_uio->uio_resid) {
 1007                         error = ENAMETOOLONG;
 1008                         goto error;
 1009                 }
 1010                 error = uiomove(cp, len, ap->a_uio);
 1011                 if (error)
 1012                         break;
 1013 
 1014                 /* Advance to next component. */
 1015                 pc = (void *)((char *)pc + 4 + pc->length);
 1016         }
 1017 error:
 1018         free(buf, M_DEVBUF);
 1019         return (error);
 1020 }
 1021 
 1022 static int
 1023 udf_strategy(struct vop_strategy_args *a)
 1024 {
 1025         struct buf *bp;
 1026         struct vnode *vp;
 1027         struct udf_node *node;
 1028         struct bufobj *bo;
 1029         off_t offset;
 1030         uint32_t maxsize;
 1031         daddr_t sector;
 1032         int error;
 1033 
 1034         bp = a->a_bp;
 1035         vp = a->a_vp;
 1036         node = VTON(vp);
 1037 
 1038         if (bp->b_blkno == bp->b_lblkno) {
 1039                 offset = lblktosize(node->udfmp, bp->b_lblkno);
 1040                 error = udf_bmap_internal(node, offset, &sector, &maxsize);
 1041                 if (error) {
 1042                         clrbuf(bp);
 1043                         bp->b_blkno = -1;
 1044                         bufdone(bp);
 1045                         return (0);
 1046                 }
 1047                 /* bmap gives sector numbers, bio works with device blocks */
 1048                 bp->b_blkno = sector << (node->udfmp->bshift - DEV_BSHIFT);
 1049         }
 1050         bo = node->udfmp->im_bo;
 1051         bp->b_iooffset = dbtob(bp->b_blkno);
 1052         BO_STRATEGY(bo, bp);
 1053         return (0);
 1054 }
 1055 
 1056 static int
 1057 udf_bmap(struct vop_bmap_args *a)
 1058 {
 1059         struct udf_node *node;
 1060         uint32_t max_size;
 1061         daddr_t lsector;
 1062         int nblk;
 1063         int error;
 1064 
 1065         node = VTON(a->a_vp);
 1066 
 1067         if (a->a_bop != NULL)
 1068                 *a->a_bop = &node->udfmp->im_devvp->v_bufobj;
 1069         if (a->a_bnp == NULL)
 1070                 return (0);
 1071         if (a->a_runb)
 1072                 *a->a_runb = 0;
 1073 
 1074         /*
 1075          * UDF_INVALID_BMAP means data embedded into fentry, this is an internal
 1076          * error that should not be propagated to calling code.
 1077          * Most obvious mapping for this error is EOPNOTSUPP as we can not truly
 1078          * translate block numbers in this case.
 1079          * Incidentally, this return code will make vnode pager to use VOP_READ
 1080          * to get data for mmap-ed pages and udf_read knows how to do the right
 1081          * thing for this kind of files.
 1082          */
 1083         error = udf_bmap_internal(node, a->a_bn << node->udfmp->bshift,
 1084             &lsector, &max_size);
 1085         if (error == UDF_INVALID_BMAP)
 1086                 return (EOPNOTSUPP);
 1087         if (error)
 1088                 return (error);
 1089 
 1090         /* Translate logical to physical sector number */
 1091         *a->a_bnp = lsector << (node->udfmp->bshift - DEV_BSHIFT);
 1092 
 1093         /*
 1094          * Determine maximum number of readahead blocks following the
 1095          * requested block.
 1096          */
 1097         if (a->a_runp) {
 1098                 nblk = (max_size >> node->udfmp->bshift) - 1;
 1099                 if (nblk <= 0)
 1100                         *a->a_runp = 0;
 1101                 else if (nblk >= (MAXBSIZE >> node->udfmp->bshift))
 1102                         *a->a_runp = (MAXBSIZE >> node->udfmp->bshift) - 1;
 1103                 else
 1104                         *a->a_runp = nblk;
 1105         }
 1106 
 1107         if (a->a_runb) {
 1108                 *a->a_runb = 0;
 1109         }
 1110 
 1111         return (0);
 1112 }
 1113 
 1114 /*
 1115  * The all powerful VOP_LOOKUP().
 1116  */
 1117 static int
 1118 udf_lookup(struct vop_cachedlookup_args *a)
 1119 {
 1120         struct vnode *dvp;
 1121         struct vnode *tdp = NULL;
 1122         struct vnode **vpp = a->a_vpp;
 1123         struct udf_node *node;
 1124         struct udf_mnt *udfmp;
 1125         struct fileid_desc *fid = NULL;
 1126         struct udf_dirstream *ds;
 1127         u_long nameiop;
 1128         u_long flags;
 1129         char *nameptr;
 1130         long namelen;
 1131         ino_t id = 0;
 1132         int offset, error = 0;
 1133         int fsize, lkflags, ltype, numdirpasses;
 1134 
 1135         dvp = a->a_dvp;
 1136         node = VTON(dvp);
 1137         udfmp = node->udfmp;
 1138         nameiop = a->a_cnp->cn_nameiop;
 1139         flags = a->a_cnp->cn_flags;
 1140         lkflags = a->a_cnp->cn_lkflags;
 1141         nameptr = a->a_cnp->cn_nameptr;
 1142         namelen = a->a_cnp->cn_namelen;
 1143         fsize = le64toh(node->fentry->inf_len);
 1144 
 1145         /*
 1146          * If this is a LOOKUP and we've already partially searched through
 1147          * the directory, pick up where we left off and flag that the
 1148          * directory may need to be searched twice.  For a full description,
 1149          * see /sys/fs/cd9660/cd9660_lookup.c:cd9660_lookup()
 1150          */
 1151         if (nameiop != LOOKUP || node->diroff == 0 || node->diroff > fsize) {
 1152                 offset = 0;
 1153                 numdirpasses = 1;
 1154         } else {
 1155                 offset = node->diroff;
 1156                 numdirpasses = 2;
 1157                 nchstats.ncs_2passes++;
 1158         }
 1159 
 1160 lookloop:
 1161         ds = udf_opendir(node, offset, fsize, udfmp);
 1162 
 1163         while ((fid = udf_getfid(ds)) != NULL) {
 1164                 /* XXX Should we return an error on a bad fid? */
 1165                 if (udf_checktag(&fid->tag, TAGID_FID)) {
 1166                         printf("udf_lookup: Invalid tag\n");
 1167                         error = EIO;
 1168                         break;
 1169                 }
 1170 
 1171                 /* Is this a deleted file? */
 1172                 if (fid->file_char & UDF_FILE_CHAR_DEL)
 1173                         continue;
 1174 
 1175                 if ((fid->l_fi == 0) && (fid->file_char & UDF_FILE_CHAR_PAR)) {
 1176                         if (flags & ISDOTDOT) {
 1177                                 id = udf_getid(&fid->icb);
 1178                                 break;
 1179                         }
 1180                 } else {
 1181                         if (!(udf_cmpname(&fid->data[fid->l_iu],
 1182                             nameptr, fid->l_fi, namelen, udfmp))) {
 1183                                 id = udf_getid(&fid->icb);
 1184                                 break;
 1185                         }
 1186                 }
 1187         }
 1188 
 1189         if (!error)
 1190                 error = ds->error;
 1191 
 1192         /* XXX Bail out here? */
 1193         if (error) {
 1194                 udf_closedir(ds);
 1195                 return (error);
 1196         }
 1197 
 1198         /* Did we have a match? */
 1199         if (id) {
 1200                 /*
 1201                  * Remember where this entry was if it's the final
 1202                  * component.
 1203                  */
 1204                 if ((flags & ISLASTCN) && nameiop == LOOKUP)
 1205                         node->diroff = ds->offset + ds->off;
 1206                 if (numdirpasses == 2)
 1207                         nchstats.ncs_pass2++;
 1208                 udf_closedir(ds);
 1209 
 1210                 if (flags & ISDOTDOT) {
 1211                         error = vn_vget_ino(dvp, id, lkflags, &tdp);
 1212                 } else if (node->hash_id == id) {
 1213                         VREF(dvp);      /* we want ourself, ie "." */
 1214                         /*
 1215                          * When we lookup "." we still can be asked to lock it
 1216                          * differently.
 1217                          */
 1218                         ltype = lkflags & LK_TYPE_MASK;
 1219                         if (ltype != VOP_ISLOCKED(dvp)) {
 1220                                 if (ltype == LK_EXCLUSIVE)
 1221                                         vn_lock(dvp, LK_UPGRADE | LK_RETRY);
 1222                                 else /* if (ltype == LK_SHARED) */
 1223                                         vn_lock(dvp, LK_DOWNGRADE | LK_RETRY);
 1224                         }
 1225                         tdp = dvp;
 1226                 } else
 1227                         error = udf_vget(udfmp->im_mountp, id, lkflags, &tdp);
 1228                 if (!error) {
 1229                         *vpp = tdp;
 1230                         /* Put this entry in the cache */
 1231                         if (flags & MAKEENTRY)
 1232                                 cache_enter(dvp, *vpp, a->a_cnp);
 1233                 }
 1234         } else {
 1235                 /* Name wasn't found on this pass.  Do another pass? */
 1236                 if (numdirpasses == 2) {
 1237                         numdirpasses--;
 1238                         offset = 0;
 1239                         udf_closedir(ds);
 1240                         goto lookloop;
 1241                 }
 1242                 udf_closedir(ds);
 1243 
 1244                 /* Enter name into cache as non-existant */
 1245                 if (flags & MAKEENTRY)
 1246                         cache_enter(dvp, *vpp, a->a_cnp);
 1247 
 1248                 if ((flags & ISLASTCN) &&
 1249                     (nameiop == CREATE || nameiop == RENAME)) {
 1250                         error = EROFS;
 1251                 } else {
 1252                         error = ENOENT;
 1253                 }
 1254         }
 1255 
 1256         return (error);
 1257 }
 1258 
 1259 static int
 1260 udf_reclaim(struct vop_reclaim_args *a)
 1261 {
 1262         struct vnode *vp;
 1263         struct udf_node *unode;
 1264 
 1265         vp = a->a_vp;
 1266         unode = VTON(vp);
 1267 
 1268         if (unode != NULL) {
 1269                 vfs_hash_remove(vp);
 1270 
 1271                 if (unode->fentry != NULL)
 1272                         free(unode->fentry, M_UDFFENTRY);
 1273                 uma_zfree(udf_zone_node, unode);
 1274                 vp->v_data = NULL;
 1275         }
 1276 
 1277         return (0);
 1278 }
 1279 
 1280 static int
 1281 udf_vptofh(struct vop_vptofh_args *a)
 1282 {
 1283         struct udf_node *node;
 1284         struct ifid *ifhp;
 1285 
 1286         node = VTON(a->a_vp);
 1287         ifhp = (struct ifid *)a->a_fhp;
 1288         ifhp->ifid_len = sizeof(struct ifid);
 1289         ifhp->ifid_ino = node->hash_id;
 1290 
 1291         return (0);
 1292 }
 1293 
 1294 /*
 1295  * Read the block and then set the data pointer to correspond with the
 1296  * offset passed in.  Only read in at most 'size' bytes, and then set 'size'
 1297  * to the number of bytes pointed to.  If 'size' is zero, try to read in a
 1298  * whole extent.
 1299  *
 1300  * Note that *bp may be assigned error or not.
 1301  *
 1302  */
 1303 static int
 1304 udf_readatoffset(struct udf_node *node, int *size, off_t offset,
 1305     struct buf **bp, uint8_t **data)
 1306 {
 1307         struct udf_mnt *udfmp = node->udfmp;
 1308         struct vnode *vp = node->i_vnode;
 1309         struct file_entry *fentry;
 1310         struct buf *bp1;
 1311         uint32_t max_size;
 1312         daddr_t sector;
 1313         off_t off;
 1314         int adj_size;
 1315         int error;
 1316 
 1317         /*
 1318          * This call is made *not* only to detect UDF_INVALID_BMAP case,
 1319          * max_size is used as an ad-hoc read-ahead hint for "normal" case.
 1320          */
 1321         error = udf_bmap_internal(node, offset, &sector, &max_size);
 1322         if (error == UDF_INVALID_BMAP) {
 1323                 /*
 1324                  * This error means that the file *data* is stored in the
 1325                  * allocation descriptor field of the file entry.
 1326                  */
 1327                 fentry = node->fentry;
 1328                 *data = &fentry->data[le32toh(fentry->l_ea)];
 1329                 *size = le32toh(fentry->l_ad);
 1330                 if (offset >= *size)
 1331                         *size = 0;
 1332                 else {
 1333                         *data += offset;
 1334                         *size -= offset;
 1335                 }
 1336                 return (0);
 1337         } else if (error != 0) {
 1338                 return (error);
 1339         }
 1340 
 1341         /* Adjust the size so that it is within range */
 1342         if (*size == 0 || *size > max_size)
 1343                 *size = max_size;
 1344 
 1345         /*
 1346          * Because we will read starting at block boundary, we need to adjust
 1347          * how much we need to read so that all promised data is in.
 1348          * Also, we can't promise to read more than MAXBSIZE bytes starting
 1349          * from block boundary, so adjust what we promise too.
 1350          */
 1351         off = blkoff(udfmp, offset);
 1352         *size = min(*size, MAXBSIZE - off);
 1353         adj_size = (*size + off + udfmp->bmask) & ~udfmp->bmask;
 1354         *bp = NULL;
 1355         if ((error = bread(vp, lblkno(udfmp, offset), adj_size, NOCRED, bp))) {
 1356                 printf("warning: udf_readlblks returned error %d\n", error);
 1357                 /* note: *bp may be non-NULL */
 1358                 return (error);
 1359         }
 1360 
 1361         bp1 = *bp;
 1362         *data = (uint8_t *)&bp1->b_data[offset & udfmp->bmask];
 1363         return (0);
 1364 }
 1365 
 1366 /*
 1367  * Translate a file offset into a logical block and then into a physical
 1368  * block.
 1369  * max_size - maximum number of bytes that can be read starting from given
 1370  * offset, rather than beginning of calculated sector number
 1371  */
 1372 static int
 1373 udf_bmap_internal(struct udf_node *node, off_t offset, daddr_t *sector,
 1374     uint32_t *max_size)
 1375 {
 1376         struct udf_mnt *udfmp;
 1377         struct file_entry *fentry;
 1378         void *icb;
 1379         struct icb_tag *tag;
 1380         uint32_t icblen = 0;
 1381         daddr_t lsector;
 1382         int ad_offset, ad_num = 0;
 1383         int i, p_offset;
 1384 
 1385         udfmp = node->udfmp;
 1386         fentry = node->fentry;
 1387         tag = &fentry->icbtag;
 1388 
 1389         switch (le16toh(tag->strat_type)) {
 1390         case 4:
 1391                 break;
 1392 
 1393         case 4096:
 1394                 printf("Cannot deal with strategy4096 yet!\n");
 1395                 return (ENODEV);
 1396 
 1397         default:
 1398                 printf("Unknown strategy type %d\n", tag->strat_type);
 1399                 return (ENODEV);
 1400         }
 1401 
 1402         switch (le16toh(tag->flags) & 0x7) {
 1403         case 0:
 1404                 /*
 1405                  * The allocation descriptor field is filled with short_ad's.
 1406                  * If the offset is beyond the current extent, look for the
 1407                  * next extent.
 1408                  */
 1409                 do {
 1410                         offset -= icblen;
 1411                         ad_offset = sizeof(struct short_ad) * ad_num;
 1412                         if (ad_offset > le32toh(fentry->l_ad)) {
 1413                                 printf("File offset out of bounds\n");
 1414                                 return (EINVAL);
 1415                         }
 1416                         icb = GETICB(short_ad, fentry,
 1417                             le32toh(fentry->l_ea) + ad_offset);
 1418                         icblen = GETICBLEN(short_ad, icb);
 1419                         ad_num++;
 1420                 } while(offset >= icblen);
 1421 
 1422                 lsector = (offset  >> udfmp->bshift) +
 1423                     le32toh(((struct short_ad *)(icb))->pos);
 1424 
 1425                 *max_size = icblen - offset;
 1426 
 1427                 break;
 1428         case 1:
 1429                 /*
 1430                  * The allocation descriptor field is filled with long_ad's
 1431                  * If the offset is beyond the current extent, look for the
 1432                  * next extent.
 1433                  */
 1434                 do {
 1435                         offset -= icblen;
 1436                         ad_offset = sizeof(struct long_ad) * ad_num;
 1437                         if (ad_offset > le32toh(fentry->l_ad)) {
 1438                                 printf("File offset out of bounds\n");
 1439                                 return (EINVAL);
 1440                         }
 1441                         icb = GETICB(long_ad, fentry,
 1442                             le32toh(fentry->l_ea) + ad_offset);
 1443                         icblen = GETICBLEN(long_ad, icb);
 1444                         ad_num++;
 1445                 } while(offset >= icblen);
 1446 
 1447                 lsector = (offset >> udfmp->bshift) +
 1448                     le32toh(((struct long_ad *)(icb))->loc.lb_num);
 1449 
 1450                 *max_size = icblen - offset;
 1451 
 1452                 break;
 1453         case 3:
 1454                 /*
 1455                  * This type means that the file *data* is stored in the
 1456                  * allocation descriptor field of the file entry.
 1457                  */
 1458                 *max_size = 0;
 1459                 *sector = node->hash_id + udfmp->part_start;
 1460 
 1461                 return (UDF_INVALID_BMAP);
 1462         case 2:
 1463                 /* DirectCD does not use extended_ad's */
 1464         default:
 1465                 printf("Unsupported allocation descriptor %d\n",
 1466                        tag->flags & 0x7);
 1467                 return (ENODEV);
 1468         }
 1469 
 1470         *sector = lsector + udfmp->part_start;
 1471 
 1472         /*
 1473          * Check the sparing table.  Each entry represents the beginning of
 1474          * a packet.
 1475          */
 1476         if (udfmp->s_table != NULL) {
 1477                 for (i = 0; i< udfmp->s_table_entries; i++) {
 1478                         p_offset =
 1479                             lsector - le32toh(udfmp->s_table->entries[i].org);
 1480                         if ((p_offset < udfmp->p_sectors) && (p_offset >= 0)) {
 1481                                 *sector =
 1482                                    le32toh(udfmp->s_table->entries[i].map) +
 1483                                     p_offset;
 1484                                 break;
 1485                         }
 1486                 }
 1487         }
 1488 
 1489         return (0);
 1490 }

Cache object: 7e34640c4f7a73da6e3f4bc19cf1f309


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