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  * Copyright (c) 2001, 2002 Scott Long <scottl@freebsd.org>
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  *
   26  * $FreeBSD: releng/10.0/sys/fs/udf/udf_vnops.c 248282 2013-03-14 20:28:26Z kib $
   27  */
   28 
   29 /* udf_vnops.c */
   30 /* Take care of the vnode side of things */
   31 
   32 #include <sys/param.h>
   33 #include <sys/systm.h>
   34 #include <sys/namei.h>
   35 #include <sys/kernel.h>
   36 #include <sys/malloc.h>
   37 #include <sys/stat.h>
   38 #include <sys/bio.h>
   39 #include <sys/conf.h>
   40 #include <sys/buf.h>
   41 #include <sys/iconv.h>
   42 #include <sys/mount.h>
   43 #include <sys/vnode.h>
   44 #include <sys/dirent.h>
   45 #include <sys/queue.h>
   46 #include <sys/unistd.h>
   47 #include <sys/endian.h>
   48 
   49 #include <vm/uma.h>
   50 
   51 #include <fs/udf/ecma167-udf.h>
   52 #include <fs/udf/osta.h>
   53 #include <fs/udf/udf.h>
   54 #include <fs/udf/udf_mount.h>
   55 
   56 extern struct iconv_functions *udf_iconv;
   57 
   58 static vop_access_t     udf_access;
   59 static vop_getattr_t    udf_getattr;
   60 static vop_open_t       udf_open;
   61 static vop_ioctl_t      udf_ioctl;
   62 static vop_pathconf_t   udf_pathconf;
   63 static vop_print_t      udf_print;
   64 static vop_read_t       udf_read;
   65 static vop_readdir_t    udf_readdir;
   66 static vop_readlink_t   udf_readlink;
   67 static vop_setattr_t    udf_setattr;
   68 static vop_strategy_t   udf_strategy;
   69 static vop_bmap_t       udf_bmap;
   70 static vop_cachedlookup_t       udf_lookup;
   71 static vop_reclaim_t    udf_reclaim;
   72 static vop_vptofh_t     udf_vptofh;
   73 static int udf_readatoffset(struct udf_node *node, int *size, off_t offset,
   74     struct buf **bp, uint8_t **data);
   75 static int udf_bmap_internal(struct udf_node *node, off_t offset,
   76     daddr_t *sector, uint32_t *max_size);
   77 
   78 static struct vop_vector udf_vnodeops = {
   79         .vop_default =          &default_vnodeops,
   80 
   81         .vop_access =           udf_access,
   82         .vop_bmap =             udf_bmap,
   83         .vop_cachedlookup =     udf_lookup,
   84         .vop_getattr =          udf_getattr,
   85         .vop_ioctl =            udf_ioctl,
   86         .vop_lookup =           vfs_cache_lookup,
   87         .vop_open =             udf_open,
   88         .vop_pathconf =         udf_pathconf,
   89         .vop_print =            udf_print,
   90         .vop_read =             udf_read,
   91         .vop_readdir =          udf_readdir,
   92         .vop_readlink =         udf_readlink,
   93         .vop_reclaim =          udf_reclaim,
   94         .vop_setattr =          udf_setattr,
   95         .vop_strategy =         udf_strategy,
   96         .vop_vptofh =           udf_vptofh,
   97 };
   98 
   99 struct vop_vector udf_fifoops = {
  100         .vop_default =          &fifo_specops,
  101         .vop_access =           udf_access,
  102         .vop_getattr =          udf_getattr,
  103         .vop_print =            udf_print,
  104         .vop_reclaim =          udf_reclaim,
  105         .vop_setattr =          udf_setattr,
  106         .vop_vptofh =           udf_vptofh,
  107 };
  108 
  109 static MALLOC_DEFINE(M_UDFFID, "udf_fid", "UDF FileId structure");
  110 static MALLOC_DEFINE(M_UDFDS, "udf_ds", "UDF Dirstream structure");
  111 
  112 #define UDF_INVALID_BMAP        -1
  113 
  114 int
  115 udf_allocv(struct mount *mp, struct vnode **vpp, struct thread *td)
  116 {
  117         int error;
  118         struct vnode *vp;
  119 
  120         error = getnewvnode("udf", mp, &udf_vnodeops, &vp);
  121         if (error) {
  122                 printf("udf_allocv: failed to allocate new vnode\n");
  123                 return (error);
  124         }
  125 
  126         *vpp = vp;
  127         return (0);
  128 }
  129 
  130 /* Convert file entry permission (5 bits per owner/group/user) to a mode_t */
  131 static mode_t
  132 udf_permtomode(struct udf_node *node)
  133 {
  134         uint32_t perm;
  135         uint16_t flags;
  136         mode_t mode;
  137 
  138         perm = le32toh(node->fentry->perm);
  139         flags = le16toh(node->fentry->icbtag.flags);
  140 
  141         mode = perm & UDF_FENTRY_PERM_USER_MASK;
  142         mode |= ((perm & UDF_FENTRY_PERM_GRP_MASK) >> 2);
  143         mode |= ((perm & UDF_FENTRY_PERM_OWNER_MASK) >> 4);
  144         mode |= ((flags & UDF_ICB_TAG_FLAGS_STICKY) << 4);
  145         mode |= ((flags & UDF_ICB_TAG_FLAGS_SETGID) << 6);
  146         mode |= ((flags & UDF_ICB_TAG_FLAGS_SETUID) << 8);
  147 
  148         return (mode);
  149 }
  150 
  151 static int
  152 udf_access(struct vop_access_args *a)
  153 {
  154         struct vnode *vp;
  155         struct udf_node *node;
  156         accmode_t accmode;
  157         mode_t mode;
  158 
  159         vp = a->a_vp;
  160         node = VTON(vp);
  161         accmode = a->a_accmode;
  162 
  163         if (accmode & VWRITE) {
  164                 switch (vp->v_type) {
  165                 case VDIR:
  166                 case VLNK:
  167                 case VREG:
  168                         return (EROFS);
  169                         /* NOT REACHED */
  170                 default:
  171                         break;
  172                 }
  173         }
  174 
  175         mode = udf_permtomode(node);
  176 
  177         return (vaccess(vp->v_type, mode, node->fentry->uid, node->fentry->gid,
  178             accmode, a->a_cred, NULL));
  179 }
  180 
  181 static int
  182 udf_open(struct vop_open_args *ap) {
  183         struct udf_node *np = VTON(ap->a_vp);
  184         off_t fsize;
  185 
  186         fsize = le64toh(np->fentry->inf_len);
  187         vnode_create_vobject(ap->a_vp, fsize, ap->a_td);
  188         return 0;
  189 }
  190 
  191 static const int mon_lens[2][12] = {
  192         {0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334},
  193         {0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335}
  194 };
  195 
  196 static int
  197 udf_isaleapyear(int year)
  198 {
  199         int i;
  200 
  201         i = (year % 4) ? 0 : 1;
  202         i &= (year % 100) ? 1 : 0;
  203         i |= (year % 400) ? 0 : 1;
  204 
  205         return i;
  206 }
  207 
  208 /*
  209  * Timezone calculation compliments of Julian Elischer <julian@elischer.org>.
  210  */
  211 static void
  212 udf_timetotimespec(struct timestamp *time, struct timespec *t)
  213 {
  214         int i, lpyear, daysinyear, year, startyear;
  215         union {
  216                 uint16_t        u_tz_offset;
  217                 int16_t         s_tz_offset;
  218         } tz;
  219 
  220         /*
  221          * DirectCD seems to like using bogus year values.
  222          * Don't trust time->month as it will be used for an array index.
  223          */
  224         year = le16toh(time->year);
  225         if (year < 1970 || time->month < 1 || time->month > 12) {
  226                 t->tv_sec = 0;
  227                 t->tv_nsec = 0;
  228                 return;
  229         }
  230 
  231         /* Calculate the time and day */
  232         t->tv_sec = time->second;
  233         t->tv_sec += time->minute * 60;
  234         t->tv_sec += time->hour * 3600;
  235         t->tv_sec += (time->day - 1) * 3600 * 24;
  236 
  237         /* Calculate the month */
  238         lpyear = udf_isaleapyear(year);
  239         t->tv_sec += mon_lens[lpyear][time->month - 1] * 3600 * 24;
  240 
  241         /* Speed up the calculation */
  242         startyear = 1970;
  243         if (year > 2009) {
  244                 t->tv_sec += 1262304000;
  245                 startyear += 40;
  246         } else if (year > 1999) {
  247                 t->tv_sec += 946684800;
  248                 startyear += 30;
  249         } else if (year > 1989) {
  250                 t->tv_sec += 631152000;
  251                 startyear += 20;
  252         } else if (year > 1979) {
  253                 t->tv_sec += 315532800;
  254                 startyear += 10;
  255         }
  256 
  257         daysinyear = (year - startyear) * 365;
  258         for (i = startyear; i < year; i++)
  259                 daysinyear += udf_isaleapyear(i);
  260         t->tv_sec += daysinyear * 3600 * 24;
  261 
  262         /* Calculate microseconds */
  263         t->tv_nsec = time->centisec * 10000 + time->hund_usec * 100 +
  264             time->usec;
  265 
  266         /*
  267          * Calculate the time zone.  The timezone is 12 bit signed 2's
  268          * complement, so we gotta do some extra magic to handle it right.
  269          */
  270         tz.u_tz_offset = le16toh(time->type_tz);
  271         tz.u_tz_offset &= 0x0fff;
  272         if (tz.u_tz_offset & 0x0800)
  273                 tz.u_tz_offset |= 0xf000;       /* extend the sign to 16 bits */
  274         if ((le16toh(time->type_tz) & 0x1000) && (tz.s_tz_offset != -2047))
  275                 t->tv_sec -= tz.s_tz_offset * 60;
  276 
  277         return;
  278 }
  279 
  280 static int
  281 udf_getattr(struct vop_getattr_args *a)
  282 {
  283         struct vnode *vp;
  284         struct udf_node *node;
  285         struct vattr *vap;
  286         struct file_entry *fentry;
  287         struct timespec ts;
  288 
  289         ts.tv_sec = 0;
  290 
  291         vp = a->a_vp;
  292         vap = a->a_vap;
  293         node = VTON(vp);
  294         fentry = node->fentry;
  295 
  296         vap->va_fsid = dev2udev(node->udfmp->im_dev);
  297         vap->va_fileid = node->hash_id;
  298         vap->va_mode = udf_permtomode(node);
  299         vap->va_nlink = le16toh(fentry->link_cnt);
  300         /*
  301          * XXX The spec says that -1 is valid for uid/gid and indicates an
  302          * invalid uid/gid.  How should this be represented?
  303          */
  304         vap->va_uid = (le32toh(fentry->uid) == -1) ? 0 : le32toh(fentry->uid);
  305         vap->va_gid = (le32toh(fentry->gid) == -1) ? 0 : le32toh(fentry->gid);
  306         udf_timetotimespec(&fentry->atime, &vap->va_atime);
  307         udf_timetotimespec(&fentry->mtime, &vap->va_mtime);
  308         vap->va_ctime = vap->va_mtime; /* XXX Stored as an Extended Attribute */
  309         vap->va_rdev = NODEV;
  310         if (vp->v_type & VDIR) {
  311                 /*
  312                  * Directories that are recorded within their ICB will show
  313                  * as having 0 blocks recorded.  Since tradition dictates
  314                  * that directories consume at least one logical block,
  315                  * make it appear so.
  316                  */
  317                 if (fentry->logblks_rec != 0) {
  318                         vap->va_size =
  319                             le64toh(fentry->logblks_rec) * node->udfmp->bsize;
  320                 } else {
  321                         vap->va_size = node->udfmp->bsize;
  322                 }
  323         } else {
  324                 vap->va_size = le64toh(fentry->inf_len);
  325         }
  326         vap->va_flags = 0;
  327         vap->va_gen = 1;
  328         vap->va_blocksize = node->udfmp->bsize;
  329         vap->va_bytes = le64toh(fentry->inf_len);
  330         vap->va_type = vp->v_type;
  331         vap->va_filerev = 0; /* XXX */
  332         return (0);
  333 }
  334 
  335 static int
  336 udf_setattr(struct vop_setattr_args *a)
  337 {
  338         struct vnode *vp;
  339         struct vattr *vap;
  340 
  341         vp = a->a_vp;
  342         vap = a->a_vap;
  343         if (vap->va_flags != (u_long)VNOVAL || vap->va_uid != (uid_t)VNOVAL ||
  344             vap->va_gid != (gid_t)VNOVAL || vap->va_atime.tv_sec != VNOVAL ||
  345             vap->va_mtime.tv_sec != VNOVAL || vap->va_mode != (mode_t)VNOVAL)
  346                 return (EROFS);
  347         if (vap->va_size != (u_quad_t)VNOVAL) {
  348                 switch (vp->v_type) {
  349                 case VDIR:
  350                         return (EISDIR);
  351                 case VLNK:
  352                 case VREG:
  353                         return (EROFS);
  354                 case VCHR:
  355                 case VBLK:
  356                 case VSOCK:
  357                 case VFIFO:
  358                 case VNON:
  359                 case VBAD:
  360                 case VMARKER:
  361                         return (0);
  362                 }
  363         }
  364         return (0);
  365 }
  366 
  367 /*
  368  * File specific ioctls.
  369  */
  370 static int
  371 udf_ioctl(struct vop_ioctl_args *a)
  372 {
  373         printf("%s called\n", __func__);
  374         return (ENOTTY);
  375 }
  376 
  377 /*
  378  * I'm not sure that this has much value in a read-only filesystem, but
  379  * cd9660 has it too.
  380  */
  381 static int
  382 udf_pathconf(struct vop_pathconf_args *a)
  383 {
  384 
  385         switch (a->a_name) {
  386         case _PC_LINK_MAX:
  387                 *a->a_retval = 65535;
  388                 return (0);
  389         case _PC_NAME_MAX:
  390                 *a->a_retval = NAME_MAX;
  391                 return (0);
  392         case _PC_PATH_MAX:
  393                 *a->a_retval = PATH_MAX;
  394                 return (0);
  395         case _PC_NO_TRUNC:
  396                 *a->a_retval = 1;
  397                 return (0);
  398         default:
  399                 return (EINVAL);
  400         }
  401 }
  402 
  403 static int
  404 udf_print(struct vop_print_args *ap)
  405 {
  406         struct vnode *vp = ap->a_vp;
  407         struct udf_node *node = VTON(vp);
  408 
  409         printf("    ino %lu, on dev %s", (u_long)node->hash_id,
  410             devtoname(node->udfmp->im_dev));
  411         if (vp->v_type == VFIFO)
  412                 fifo_printinfo(vp);
  413         printf("\n");
  414         return (0);
  415 }
  416 
  417 #define lblkno(udfmp, loc)      ((loc) >> (udfmp)->bshift)
  418 #define blkoff(udfmp, loc)      ((loc) & (udfmp)->bmask)
  419 #define lblktosize(udfmp, blk)  ((blk) << (udfmp)->bshift)
  420 
  421 static inline int
  422 is_data_in_fentry(const struct udf_node *node)
  423 {
  424         const struct file_entry *fentry = node->fentry;
  425 
  426         return ((le16toh(fentry->icbtag.flags) & 0x7) == 3);
  427 }
  428 
  429 static int
  430 udf_read(struct vop_read_args *ap)
  431 {
  432         struct vnode *vp = ap->a_vp;
  433         struct uio *uio = ap->a_uio;
  434         struct udf_node *node = VTON(vp);
  435         struct udf_mnt *udfmp;
  436         struct file_entry *fentry;
  437         struct buf *bp;
  438         uint8_t *data;
  439         daddr_t lbn, rablock;
  440         off_t diff, fsize;
  441         ssize_t n;
  442         int error = 0;
  443         long size, on;
  444 
  445         if (uio->uio_resid == 0)
  446                 return (0);
  447         if (uio->uio_offset < 0)
  448                 return (EINVAL);
  449 
  450         if (is_data_in_fentry(node)) {
  451                 fentry = node->fentry;
  452                 data = &fentry->data[le32toh(fentry->l_ea)];
  453                 fsize = le32toh(fentry->l_ad);
  454 
  455                 n = uio->uio_resid;
  456                 diff = fsize - uio->uio_offset;
  457                 if (diff <= 0)
  458                         return (0);
  459                 if (diff < n)
  460                         n = diff;
  461                 error = uiomove(data + uio->uio_offset, (int)n, uio);
  462                 return (error);
  463         }
  464 
  465         fsize = le64toh(node->fentry->inf_len);
  466         udfmp = node->udfmp;
  467         do {
  468                 lbn = lblkno(udfmp, uio->uio_offset);
  469                 on = blkoff(udfmp, uio->uio_offset);
  470                 n = min((u_int)(udfmp->bsize - on),
  471                         uio->uio_resid);
  472                 diff = fsize - uio->uio_offset;
  473                 if (diff <= 0)
  474                         return (0);
  475                 if (diff < n)
  476                         n = diff;
  477                 size = udfmp->bsize;
  478                 rablock = lbn + 1;
  479                 if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERR) == 0) {
  480                         if (lblktosize(udfmp, rablock) < fsize) {
  481                                 error = cluster_read(vp, fsize, lbn, size,
  482                                     NOCRED, uio->uio_resid,
  483                                     (ap->a_ioflag >> 16), 0, &bp);
  484                         } else {
  485                                 error = bread(vp, lbn, size, NOCRED, &bp);
  486                         }
  487                 } else {
  488                         error = bread(vp, lbn, size, NOCRED, &bp);
  489                 }
  490                 n = min(n, size - bp->b_resid);
  491                 if (error) {
  492                         brelse(bp);
  493                         return (error);
  494                 }
  495 
  496                 error = uiomove(bp->b_data + on, (int)n, uio);
  497                 brelse(bp);
  498         } while (error == 0 && uio->uio_resid > 0 && n != 0);
  499         return (error);
  500 }
  501 
  502 /*
  503  * Call the OSTA routines to translate the name from a CS0 dstring to a
  504  * 16-bit Unicode String.  Hooks need to be placed in here to translate from
  505  * Unicode to the encoding that the kernel/user expects.  Return the length
  506  * of the translated string.
  507  */
  508 static int
  509 udf_transname(char *cs0string, char *destname, int len, struct udf_mnt *udfmp)
  510 {
  511         unicode_t *transname;
  512         char *unibuf, *unip;
  513         int i, destlen;
  514         ssize_t unilen = 0;
  515         size_t destleft = MAXNAMLEN;
  516 
  517         /* Convert 16-bit Unicode to destname */
  518         if (udfmp->im_flags & UDFMNT_KICONV && udf_iconv) {
  519                 /* allocate a buffer big enough to hold an 8->16 bit expansion */
  520                 unibuf = uma_zalloc(udf_zone_trans, M_WAITOK);
  521                 unip = unibuf;
  522                 if ((unilen = (ssize_t)udf_UncompressUnicodeByte(len, cs0string, unibuf)) == -1) {
  523                         printf("udf: Unicode translation failed\n");
  524                         uma_zfree(udf_zone_trans, unibuf);
  525                         return 0;
  526                 }
  527 
  528                 while (unilen > 0 && destleft > 0) {
  529                         udf_iconv->conv(udfmp->im_d2l, (const char **)&unibuf,
  530                                 (size_t *)&unilen, (char **)&destname, &destleft);
  531                         /* Unconverted character found */
  532                         if (unilen > 0 && destleft > 0) {
  533                                 *destname++ = '?';
  534                                 destleft--;
  535                                 unibuf += 2;
  536                                 unilen -= 2;
  537                         }
  538                 }
  539                 uma_zfree(udf_zone_trans, unip);
  540                 *destname = '\0';
  541                 destlen = MAXNAMLEN - (int)destleft;
  542         } else {
  543                 /* allocate a buffer big enough to hold an 8->16 bit expansion */
  544                 transname = uma_zalloc(udf_zone_trans, M_WAITOK);
  545 
  546                 if ((unilen = (ssize_t)udf_UncompressUnicode(len, cs0string, transname)) == -1) {
  547                         printf("udf: Unicode translation failed\n");
  548                         uma_zfree(udf_zone_trans, transname);
  549                         return 0;
  550                 }
  551 
  552                 for (i = 0; i < unilen ; i++) {
  553                         if (transname[i] & 0xff00) {
  554                                 destname[i] = '.';      /* Fudge the 16bit chars */
  555                         } else {
  556                                 destname[i] = transname[i] & 0xff;
  557                         }
  558                 }
  559                 uma_zfree(udf_zone_trans, transname);
  560                 destname[unilen] = 0;
  561                 destlen = (int)unilen;
  562         }
  563 
  564         return (destlen);
  565 }
  566 
  567 /*
  568  * Compare a CS0 dstring with a name passed in from the VFS layer.  Return
  569  * 0 on a successful match, nonzero otherwise.  Unicode work may need to be done
  570  * here also.
  571  */
  572 static int
  573 udf_cmpname(char *cs0string, char *cmpname, int cs0len, int cmplen, struct udf_mnt *udfmp)
  574 {
  575         char *transname;
  576         int error = 0;
  577 
  578         /* This is overkill, but not worth creating a new zone */
  579         transname = uma_zalloc(udf_zone_trans, M_WAITOK);
  580 
  581         cs0len = udf_transname(cs0string, transname, cs0len, udfmp);
  582 
  583         /* Easy check.  If they aren't the same length, they aren't equal */
  584         if ((cs0len == 0) || (cs0len != cmplen))
  585                 error = -1;
  586         else
  587                 error = bcmp(transname, cmpname, cmplen);
  588 
  589         uma_zfree(udf_zone_trans, transname);
  590         return (error);
  591 }
  592 
  593 struct udf_uiodir {
  594         struct dirent *dirent;
  595         u_long *cookies;
  596         int ncookies;
  597         int acookies;
  598         int eofflag;
  599 };
  600 
  601 static int
  602 udf_uiodir(struct udf_uiodir *uiodir, int de_size, struct uio *uio, long cookie)
  603 {
  604         if (uiodir->cookies != NULL) {
  605                 if (++uiodir->acookies > uiodir->ncookies) {
  606                         uiodir->eofflag = 0;
  607                         return (-1);
  608                 }
  609                 *uiodir->cookies++ = cookie;
  610         }
  611 
  612         if (uio->uio_resid < de_size) {
  613                 uiodir->eofflag = 0;
  614                 return (-1);
  615         }
  616 
  617         return (uiomove(uiodir->dirent, de_size, uio));
  618 }
  619 
  620 static struct udf_dirstream *
  621 udf_opendir(struct udf_node *node, int offset, int fsize, struct udf_mnt *udfmp)
  622 {
  623         struct udf_dirstream *ds;
  624 
  625         ds = uma_zalloc(udf_zone_ds, M_WAITOK | M_ZERO);
  626 
  627         ds->node = node;
  628         ds->offset = offset;
  629         ds->udfmp = udfmp;
  630         ds->fsize = fsize;
  631 
  632         return (ds);
  633 }
  634 
  635 static struct fileid_desc *
  636 udf_getfid(struct udf_dirstream *ds)
  637 {
  638         struct fileid_desc *fid;
  639         int error, frag_size = 0, total_fid_size;
  640 
  641         /* End of directory? */
  642         if (ds->offset + ds->off >= ds->fsize) {
  643                 ds->error = 0;
  644                 return (NULL);
  645         }
  646 
  647         /* Grab the first extent of the directory */
  648         if (ds->off == 0) {
  649                 ds->size = 0;
  650                 error = udf_readatoffset(ds->node, &ds->size, ds->offset,
  651                     &ds->bp, &ds->data);
  652                 if (error) {
  653                         ds->error = error;
  654                         if (ds->bp != NULL)
  655                                 brelse(ds->bp);
  656                         return (NULL);
  657                 }
  658         }
  659 
  660         /*
  661          * Clean up from a previous fragmented FID.
  662          * XXX Is this the right place for this?
  663          */
  664         if (ds->fid_fragment && ds->buf != NULL) {
  665                 ds->fid_fragment = 0;
  666                 free(ds->buf, M_UDFFID);
  667         }
  668 
  669         fid = (struct fileid_desc*)&ds->data[ds->off];
  670 
  671         /*
  672          * Check to see if the fid is fragmented. The first test
  673          * ensures that we don't wander off the end of the buffer
  674          * looking for the l_iu and l_fi fields.
  675          */
  676         if (ds->off + UDF_FID_SIZE > ds->size ||
  677             ds->off + le16toh(fid->l_iu) + fid->l_fi + UDF_FID_SIZE > ds->size){
  678 
  679                 /* Copy what we have of the fid into a buffer */
  680                 frag_size = ds->size - ds->off;
  681                 if (frag_size >= ds->udfmp->bsize) {
  682                         printf("udf: invalid FID fragment\n");
  683                         ds->error = EINVAL;
  684                         return (NULL);
  685                 }
  686 
  687                 /*
  688                  * File ID descriptors can only be at most one
  689                  * logical sector in size.
  690                  */
  691                 ds->buf = malloc(ds->udfmp->bsize, M_UDFFID,
  692                      M_WAITOK | M_ZERO);
  693                 bcopy(fid, ds->buf, frag_size);
  694 
  695                 /* Reduce all of the casting magic */
  696                 fid = (struct fileid_desc*)ds->buf;
  697 
  698                 if (ds->bp != NULL)
  699                         brelse(ds->bp);
  700 
  701                 /* Fetch the next allocation */
  702                 ds->offset += ds->size;
  703                 ds->size = 0;
  704                 error = udf_readatoffset(ds->node, &ds->size, ds->offset,
  705                     &ds->bp, &ds->data);
  706                 if (error) {
  707                         ds->error = error;
  708                         return (NULL);
  709                 }
  710 
  711                 /*
  712                  * If the fragment was so small that we didn't get
  713                  * the l_iu and l_fi fields, copy those in.
  714                  */
  715                 if (frag_size < UDF_FID_SIZE)
  716                         bcopy(ds->data, &ds->buf[frag_size],
  717                             UDF_FID_SIZE - frag_size);
  718 
  719                 /*
  720                  * Now that we have enough of the fid to work with,
  721                  * copy in the rest of the fid from the new
  722                  * allocation.
  723                  */
  724                 total_fid_size = UDF_FID_SIZE + le16toh(fid->l_iu) + fid->l_fi;
  725                 if (total_fid_size > ds->udfmp->bsize) {
  726                         printf("udf: invalid FID\n");
  727                         ds->error = EIO;
  728                         return (NULL);
  729                 }
  730                 bcopy(ds->data, &ds->buf[frag_size],
  731                     total_fid_size - frag_size);
  732 
  733                 ds->fid_fragment = 1;
  734         } else {
  735                 total_fid_size = le16toh(fid->l_iu) + fid->l_fi + UDF_FID_SIZE;
  736         }
  737 
  738         /*
  739          * Update the offset. Align on a 4 byte boundary because the
  740          * UDF spec says so.
  741          */
  742         ds->this_off = ds->offset + ds->off;
  743         if (!ds->fid_fragment) {
  744                 ds->off += (total_fid_size + 3) & ~0x03;
  745         } else {
  746                 ds->off = (total_fid_size - frag_size + 3) & ~0x03;
  747         }
  748 
  749         return (fid);
  750 }
  751 
  752 static void
  753 udf_closedir(struct udf_dirstream *ds)
  754 {
  755 
  756         if (ds->bp != NULL)
  757                 brelse(ds->bp);
  758 
  759         if (ds->fid_fragment && ds->buf != NULL)
  760                 free(ds->buf, M_UDFFID);
  761 
  762         uma_zfree(udf_zone_ds, ds);
  763 }
  764 
  765 static int
  766 udf_readdir(struct vop_readdir_args *a)
  767 {
  768         struct vnode *vp;
  769         struct uio *uio;
  770         struct dirent dir;
  771         struct udf_node *node;
  772         struct udf_mnt *udfmp;
  773         struct fileid_desc *fid;
  774         struct udf_uiodir uiodir;
  775         struct udf_dirstream *ds;
  776         u_long *cookies = NULL;
  777         int ncookies;
  778         int error = 0;
  779 
  780         vp = a->a_vp;
  781         uio = a->a_uio;
  782         node = VTON(vp);
  783         udfmp = node->udfmp;
  784         uiodir.eofflag = 1;
  785 
  786         if (a->a_ncookies != NULL) {
  787                 /*
  788                  * Guess how many entries are needed.  If we run out, this
  789                  * function will be called again and thing will pick up were
  790                  * it left off.
  791                  */
  792                 ncookies = uio->uio_resid / 8;
  793                 cookies = malloc(sizeof(u_long) * ncookies,
  794                     M_TEMP, M_WAITOK);
  795                 if (cookies == NULL)
  796                         return (ENOMEM);
  797                 uiodir.ncookies = ncookies;
  798                 uiodir.cookies = cookies;
  799                 uiodir.acookies = 0;
  800         } else {
  801                 uiodir.cookies = NULL;
  802         }
  803 
  804         /*
  805          * Iterate through the file id descriptors.  Give the parent dir
  806          * entry special attention.
  807          */
  808         ds = udf_opendir(node, uio->uio_offset, le64toh(node->fentry->inf_len),
  809             node->udfmp);
  810 
  811         while ((fid = udf_getfid(ds)) != NULL) {
  812 
  813                 /* XXX Should we return an error on a bad fid? */
  814                 if (udf_checktag(&fid->tag, TAGID_FID)) {
  815                         printf("Invalid FID tag\n");
  816                         hexdump(fid, UDF_FID_SIZE, NULL, 0);
  817                         error = EIO;
  818                         break;
  819                 }
  820 
  821                 /* Is this a deleted file? */
  822                 if (fid->file_char & UDF_FILE_CHAR_DEL)
  823                         continue;
  824 
  825                 if ((fid->l_fi == 0) && (fid->file_char & UDF_FILE_CHAR_PAR)) {
  826                         /* Do up the '.' and '..' entries.  Dummy values are
  827                          * used for the cookies since the offset here is
  828                          * usually zero, and NFS doesn't like that value
  829                          */
  830                         dir.d_fileno = node->hash_id;
  831                         dir.d_type = DT_DIR;
  832                         dir.d_name[0] = '.';
  833                         dir.d_name[1] = '\0';
  834                         dir.d_namlen = 1;
  835                         dir.d_reclen = GENERIC_DIRSIZ(&dir);
  836                         uiodir.dirent = &dir;
  837                         error = udf_uiodir(&uiodir, dir.d_reclen, uio, 1);
  838                         if (error)
  839                                 break;
  840 
  841                         dir.d_fileno = udf_getid(&fid->icb);
  842                         dir.d_type = DT_DIR;
  843                         dir.d_name[0] = '.';
  844                         dir.d_name[1] = '.';
  845                         dir.d_name[2] = '\0';
  846                         dir.d_namlen = 2;
  847                         dir.d_reclen = GENERIC_DIRSIZ(&dir);
  848                         uiodir.dirent = &dir;
  849                         error = udf_uiodir(&uiodir, dir.d_reclen, uio, 2);
  850                 } else {
  851                         dir.d_namlen = udf_transname(&fid->data[fid->l_iu],
  852                             &dir.d_name[0], fid->l_fi, udfmp);
  853                         dir.d_fileno = udf_getid(&fid->icb);
  854                         dir.d_type = (fid->file_char & UDF_FILE_CHAR_DIR) ?
  855                             DT_DIR : DT_UNKNOWN;
  856                         dir.d_reclen = GENERIC_DIRSIZ(&dir);
  857                         uiodir.dirent = &dir;
  858                         error = udf_uiodir(&uiodir, dir.d_reclen, uio,
  859                             ds->this_off);
  860                 }
  861                 if (error)
  862                         break;
  863                 uio->uio_offset = ds->offset + ds->off;
  864         }
  865 
  866         /* tell the calling layer whether we need to be called again */
  867         *a->a_eofflag = uiodir.eofflag;
  868 
  869         if (error < 0)
  870                 error = 0;
  871         if (!error)
  872                 error = ds->error;
  873 
  874         udf_closedir(ds);
  875 
  876         if (a->a_ncookies != NULL) {
  877                 if (error)
  878                         free(cookies, M_TEMP);
  879                 else {
  880                         *a->a_ncookies = uiodir.acookies;
  881                         *a->a_cookies = cookies;
  882                 }
  883         }
  884 
  885         return (error);
  886 }
  887 
  888 static int
  889 udf_readlink(struct vop_readlink_args *ap)
  890 {
  891         struct path_component *pc, *end;
  892         struct vnode *vp;
  893         struct uio uio;
  894         struct iovec iov[1];
  895         struct udf_node *node;
  896         void *buf;
  897         char *cp;
  898         int error, len, root;
  899 
  900         /*
  901          * A symbolic link in UDF is a list of variable-length path
  902          * component structures.  We build a pathname in the caller's
  903          * uio by traversing this list.
  904          */
  905         vp = ap->a_vp;
  906         node = VTON(vp);
  907         len = le64toh(node->fentry->inf_len);
  908         buf = malloc(len, M_DEVBUF, M_WAITOK);
  909         iov[0].iov_len = len;
  910         iov[0].iov_base = buf;
  911         uio.uio_iov = iov;
  912         uio.uio_iovcnt = 1;
  913         uio.uio_offset = 0;
  914         uio.uio_resid = iov[0].iov_len;
  915         uio.uio_segflg = UIO_SYSSPACE;
  916         uio.uio_rw = UIO_READ;
  917         uio.uio_td = curthread;
  918         error = VOP_READ(vp, &uio, 0, ap->a_cred);
  919         if (error)
  920                 goto error;
  921 
  922         pc = buf;
  923         end = (void *)((char *)buf + len);
  924         root = 0;
  925         while (pc < end) {
  926                 switch (pc->type) {
  927                 case UDF_PATH_ROOT:
  928                         /* Only allow this at the beginning of a path. */
  929                         if ((void *)pc != buf) {
  930                                 error = EINVAL;
  931                                 goto error;
  932                         }
  933                         cp = "/";
  934                         len = 1;
  935                         root = 1;
  936                         break;
  937                 case UDF_PATH_DOT:
  938                         cp = ".";
  939                         len = 1;
  940                         break;
  941                 case UDF_PATH_DOTDOT:
  942                         cp = "..";
  943                         len = 2;
  944                         break;
  945                 case UDF_PATH_PATH:
  946                         if (pc->length == 0) {
  947                                 error = EINVAL;
  948                                 goto error;
  949                         }
  950                         /*
  951                          * XXX: We only support CS8 which appears to map
  952                          * to ASCII directly.
  953                          */
  954                         switch (pc->identifier[0]) {
  955                         case 8:
  956                                 cp = pc->identifier + 1;
  957                                 len = pc->length - 1;
  958                                 break;
  959                         default:
  960                                 error = EOPNOTSUPP;
  961                                 goto error;
  962                         }
  963                         break;
  964                 default:
  965                         error = EINVAL;
  966                         goto error;
  967                 }
  968 
  969                 /*
  970                  * If this is not the first component, insert a path
  971                  * separator.
  972                  */
  973                 if (pc != buf) {
  974                         /* If we started with root we already have a "/". */
  975                         if (root)
  976                                 goto skipslash;
  977                         root = 0;
  978                         if (ap->a_uio->uio_resid < 1) {
  979                                 error = ENAMETOOLONG;
  980                                 goto error;
  981                         }
  982                         error = uiomove("/", 1, ap->a_uio);
  983                         if (error)
  984                                 break;
  985                 }
  986         skipslash:
  987 
  988                 /* Append string at 'cp' of length 'len' to our path. */
  989                 if (len > ap->a_uio->uio_resid) {
  990                         error = ENAMETOOLONG;
  991                         goto error;
  992                 }
  993                 error = uiomove(cp, len, ap->a_uio);
  994                 if (error)
  995                         break;
  996 
  997                 /* Advance to next component. */
  998                 pc = (void *)((char *)pc + 4 + pc->length);
  999         }
 1000 error:
 1001         free(buf, M_DEVBUF);
 1002         return (error);
 1003 }
 1004 
 1005 static int
 1006 udf_strategy(struct vop_strategy_args *a)
 1007 {
 1008         struct buf *bp;
 1009         struct vnode *vp;
 1010         struct udf_node *node;
 1011         struct bufobj *bo;
 1012         off_t offset;
 1013         uint32_t maxsize;
 1014         daddr_t sector;
 1015         int error;
 1016 
 1017         bp = a->a_bp;
 1018         vp = a->a_vp;
 1019         node = VTON(vp);
 1020 
 1021         if (bp->b_blkno == bp->b_lblkno) {
 1022                 offset = lblktosize(node->udfmp, bp->b_lblkno);
 1023                 error = udf_bmap_internal(node, offset, &sector, &maxsize);
 1024                 if (error) {
 1025                         clrbuf(bp);
 1026                         bp->b_blkno = -1;
 1027                         bufdone(bp);
 1028                         return (0);
 1029                 }
 1030                 /* bmap gives sector numbers, bio works with device blocks */
 1031                 bp->b_blkno = sector << (node->udfmp->bshift - DEV_BSHIFT);
 1032         }
 1033         bo = node->udfmp->im_bo;
 1034         bp->b_iooffset = dbtob(bp->b_blkno);
 1035         BO_STRATEGY(bo, bp);
 1036         return (0);
 1037 }
 1038 
 1039 static int
 1040 udf_bmap(struct vop_bmap_args *a)
 1041 {
 1042         struct udf_node *node;
 1043         uint32_t max_size;
 1044         daddr_t lsector;
 1045         int nblk;
 1046         int error;
 1047 
 1048         node = VTON(a->a_vp);
 1049 
 1050         if (a->a_bop != NULL)
 1051                 *a->a_bop = &node->udfmp->im_devvp->v_bufobj;
 1052         if (a->a_bnp == NULL)
 1053                 return (0);
 1054         if (a->a_runb)
 1055                 *a->a_runb = 0;
 1056 
 1057         /*
 1058          * UDF_INVALID_BMAP means data embedded into fentry, this is an internal
 1059          * error that should not be propagated to calling code.
 1060          * Most obvious mapping for this error is EOPNOTSUPP as we can not truly
 1061          * translate block numbers in this case.
 1062          * Incidentally, this return code will make vnode pager to use VOP_READ
 1063          * to get data for mmap-ed pages and udf_read knows how to do the right
 1064          * thing for this kind of files.
 1065          */
 1066         error = udf_bmap_internal(node, a->a_bn << node->udfmp->bshift,
 1067             &lsector, &max_size);
 1068         if (error == UDF_INVALID_BMAP)
 1069                 return (EOPNOTSUPP);
 1070         if (error)
 1071                 return (error);
 1072 
 1073         /* Translate logical to physical sector number */
 1074         *a->a_bnp = lsector << (node->udfmp->bshift - DEV_BSHIFT);
 1075 
 1076         /*
 1077          * Determine maximum number of readahead blocks following the
 1078          * requested block.
 1079          */
 1080         if (a->a_runp) {
 1081                 nblk = (max_size >> node->udfmp->bshift) - 1;
 1082                 if (nblk <= 0)
 1083                         *a->a_runp = 0;
 1084                 else if (nblk >= (MAXBSIZE >> node->udfmp->bshift))
 1085                         *a->a_runp = (MAXBSIZE >> node->udfmp->bshift) - 1;
 1086                 else
 1087                         *a->a_runp = nblk;
 1088         }
 1089 
 1090         if (a->a_runb) {
 1091                 *a->a_runb = 0;
 1092         }
 1093 
 1094         return (0);
 1095 }
 1096 
 1097 /*
 1098  * The all powerful VOP_LOOKUP().
 1099  */
 1100 static int
 1101 udf_lookup(struct vop_cachedlookup_args *a)
 1102 {
 1103         struct vnode *dvp;
 1104         struct vnode *tdp = NULL;
 1105         struct vnode **vpp = a->a_vpp;
 1106         struct udf_node *node;
 1107         struct udf_mnt *udfmp;
 1108         struct fileid_desc *fid = NULL;
 1109         struct udf_dirstream *ds;
 1110         u_long nameiop;
 1111         u_long flags;
 1112         char *nameptr;
 1113         long namelen;
 1114         ino_t id = 0;
 1115         int offset, error = 0;
 1116         int fsize, lkflags, ltype, numdirpasses;
 1117 
 1118         dvp = a->a_dvp;
 1119         node = VTON(dvp);
 1120         udfmp = node->udfmp;
 1121         nameiop = a->a_cnp->cn_nameiop;
 1122         flags = a->a_cnp->cn_flags;
 1123         lkflags = a->a_cnp->cn_lkflags;
 1124         nameptr = a->a_cnp->cn_nameptr;
 1125         namelen = a->a_cnp->cn_namelen;
 1126         fsize = le64toh(node->fentry->inf_len);
 1127 
 1128         /*
 1129          * If this is a LOOKUP and we've already partially searched through
 1130          * the directory, pick up where we left off and flag that the
 1131          * directory may need to be searched twice.  For a full description,
 1132          * see /sys/fs/cd9660/cd9660_lookup.c:cd9660_lookup()
 1133          */
 1134         if (nameiop != LOOKUP || node->diroff == 0 || node->diroff > fsize) {
 1135                 offset = 0;
 1136                 numdirpasses = 1;
 1137         } else {
 1138                 offset = node->diroff;
 1139                 numdirpasses = 2;
 1140                 nchstats.ncs_2passes++;
 1141         }
 1142 
 1143 lookloop:
 1144         ds = udf_opendir(node, offset, fsize, udfmp);
 1145 
 1146         while ((fid = udf_getfid(ds)) != NULL) {
 1147 
 1148                 /* XXX Should we return an error on a bad fid? */
 1149                 if (udf_checktag(&fid->tag, TAGID_FID)) {
 1150                         printf("udf_lookup: Invalid tag\n");
 1151                         error = EIO;
 1152                         break;
 1153                 }
 1154 
 1155                 /* Is this a deleted file? */
 1156                 if (fid->file_char & UDF_FILE_CHAR_DEL)
 1157                         continue;
 1158 
 1159                 if ((fid->l_fi == 0) && (fid->file_char & UDF_FILE_CHAR_PAR)) {
 1160                         if (flags & ISDOTDOT) {
 1161                                 id = udf_getid(&fid->icb);
 1162                                 break;
 1163                         }
 1164                 } else {
 1165                         if (!(udf_cmpname(&fid->data[fid->l_iu],
 1166                             nameptr, fid->l_fi, namelen, udfmp))) {
 1167                                 id = udf_getid(&fid->icb);
 1168                                 break;
 1169                         }
 1170                 }
 1171         }
 1172 
 1173         if (!error)
 1174                 error = ds->error;
 1175 
 1176         /* XXX Bail out here? */
 1177         if (error) {
 1178                 udf_closedir(ds);
 1179                 return (error);
 1180         }
 1181 
 1182         /* Did we have a match? */
 1183         if (id) {
 1184                 /*
 1185                  * Remember where this entry was if it's the final
 1186                  * component.
 1187                  */
 1188                 if ((flags & ISLASTCN) && nameiop == LOOKUP)
 1189                         node->diroff = ds->offset + ds->off;
 1190                 if (numdirpasses == 2)
 1191                         nchstats.ncs_pass2++;
 1192                 udf_closedir(ds);
 1193 
 1194                 if (flags & ISDOTDOT) {
 1195                         error = vn_vget_ino(dvp, id, lkflags, &tdp);
 1196                 } else if (node->hash_id == id) {
 1197                         VREF(dvp);      /* we want ourself, ie "." */
 1198                         /*
 1199                          * When we lookup "." we still can be asked to lock it
 1200                          * differently.
 1201                          */
 1202                         ltype = lkflags & LK_TYPE_MASK;
 1203                         if (ltype != VOP_ISLOCKED(dvp)) {
 1204                                 if (ltype == LK_EXCLUSIVE)
 1205                                         vn_lock(dvp, LK_UPGRADE | LK_RETRY);
 1206                                 else /* if (ltype == LK_SHARED) */
 1207                                         vn_lock(dvp, LK_DOWNGRADE | LK_RETRY);
 1208                         }
 1209                         tdp = dvp;
 1210                 } else
 1211                         error = udf_vget(udfmp->im_mountp, id, lkflags, &tdp);
 1212                 if (!error) {
 1213                         *vpp = tdp;
 1214                         /* Put this entry in the cache */
 1215                         if (flags & MAKEENTRY)
 1216                                 cache_enter(dvp, *vpp, a->a_cnp);
 1217                 }
 1218         } else {
 1219                 /* Name wasn't found on this pass.  Do another pass? */
 1220                 if (numdirpasses == 2) {
 1221                         numdirpasses--;
 1222                         offset = 0;
 1223                         udf_closedir(ds);
 1224                         goto lookloop;
 1225                 }
 1226                 udf_closedir(ds);
 1227 
 1228                 /* Enter name into cache as non-existant */
 1229                 if (flags & MAKEENTRY)
 1230                         cache_enter(dvp, *vpp, a->a_cnp);
 1231 
 1232                 if ((flags & ISLASTCN) &&
 1233                     (nameiop == CREATE || nameiop == RENAME)) {
 1234                         error = EROFS;
 1235                 } else {
 1236                         error = ENOENT;
 1237                 }
 1238         }
 1239 
 1240         return (error);
 1241 }
 1242 
 1243 static int
 1244 udf_reclaim(struct vop_reclaim_args *a)
 1245 {
 1246         struct vnode *vp;
 1247         struct udf_node *unode;
 1248 
 1249         vp = a->a_vp;
 1250         unode = VTON(vp);
 1251 
 1252         /*
 1253          * Destroy the vm object and flush associated pages.
 1254          */
 1255         vnode_destroy_vobject(vp);
 1256 
 1257         if (unode != NULL) {
 1258                 vfs_hash_remove(vp);
 1259 
 1260                 if (unode->fentry != NULL)
 1261                         free(unode->fentry, M_UDFFENTRY);
 1262                 uma_zfree(udf_zone_node, unode);
 1263                 vp->v_data = NULL;
 1264         }
 1265 
 1266         return (0);
 1267 }
 1268 
 1269 static int
 1270 udf_vptofh(struct vop_vptofh_args *a)
 1271 {
 1272         struct udf_node *node;
 1273         struct ifid *ifhp;
 1274 
 1275         node = VTON(a->a_vp);
 1276         ifhp = (struct ifid *)a->a_fhp;
 1277         ifhp->ifid_len = sizeof(struct ifid);
 1278         ifhp->ifid_ino = node->hash_id;
 1279 
 1280         return (0);
 1281 }
 1282 
 1283 /*
 1284  * Read the block and then set the data pointer to correspond with the
 1285  * offset passed in.  Only read in at most 'size' bytes, and then set 'size'
 1286  * to the number of bytes pointed to.  If 'size' is zero, try to read in a
 1287  * whole extent.
 1288  *
 1289  * Note that *bp may be assigned error or not.
 1290  *
 1291  */
 1292 static int
 1293 udf_readatoffset(struct udf_node *node, int *size, off_t offset,
 1294     struct buf **bp, uint8_t **data)
 1295 {
 1296         struct udf_mnt *udfmp = node->udfmp;
 1297         struct vnode *vp = node->i_vnode;
 1298         struct file_entry *fentry;
 1299         struct buf *bp1;
 1300         uint32_t max_size;
 1301         daddr_t sector;
 1302         off_t off;
 1303         int adj_size;
 1304         int error;
 1305 
 1306         /*
 1307          * This call is made *not* only to detect UDF_INVALID_BMAP case,
 1308          * max_size is used as an ad-hoc read-ahead hint for "normal" case.
 1309          */
 1310         error = udf_bmap_internal(node, offset, &sector, &max_size);
 1311         if (error == UDF_INVALID_BMAP) {
 1312                 /*
 1313                  * This error means that the file *data* is stored in the
 1314                  * allocation descriptor field of the file entry.
 1315                  */
 1316                 fentry = node->fentry;
 1317                 *data = &fentry->data[le32toh(fentry->l_ea)];
 1318                 *size = le32toh(fentry->l_ad);
 1319                 if (offset >= *size)
 1320                         *size = 0;
 1321                 else {
 1322                         *data += offset;
 1323                         *size -= offset;
 1324                 }
 1325                 return (0);
 1326         } else if (error != 0) {
 1327                 return (error);
 1328         }
 1329 
 1330         /* Adjust the size so that it is within range */
 1331         if (*size == 0 || *size > max_size)
 1332                 *size = max_size;
 1333 
 1334         /*
 1335          * Because we will read starting at block boundary, we need to adjust
 1336          * how much we need to read so that all promised data is in.
 1337          * Also, we can't promise to read more than MAXBSIZE bytes starting
 1338          * from block boundary, so adjust what we promise too.
 1339          */
 1340         off = blkoff(udfmp, offset);
 1341         *size = min(*size, MAXBSIZE - off);
 1342         adj_size = (*size + off + udfmp->bmask) & ~udfmp->bmask;
 1343         *bp = NULL;
 1344         if ((error = bread(vp, lblkno(udfmp, offset), adj_size, NOCRED, bp))) {
 1345                 printf("warning: udf_readlblks returned error %d\n", error);
 1346                 /* note: *bp may be non-NULL */
 1347                 return (error);
 1348         }
 1349 
 1350         bp1 = *bp;
 1351         *data = (uint8_t *)&bp1->b_data[offset & udfmp->bmask];
 1352         return (0);
 1353 }
 1354 
 1355 /*
 1356  * Translate a file offset into a logical block and then into a physical
 1357  * block.
 1358  * max_size - maximum number of bytes that can be read starting from given
 1359  * offset, rather than beginning of calculated sector number
 1360  */
 1361 static int
 1362 udf_bmap_internal(struct udf_node *node, off_t offset, daddr_t *sector,
 1363     uint32_t *max_size)
 1364 {
 1365         struct udf_mnt *udfmp;
 1366         struct file_entry *fentry;
 1367         void *icb;
 1368         struct icb_tag *tag;
 1369         uint32_t icblen = 0;
 1370         daddr_t lsector;
 1371         int ad_offset, ad_num = 0;
 1372         int i, p_offset;
 1373 
 1374         udfmp = node->udfmp;
 1375         fentry = node->fentry;
 1376         tag = &fentry->icbtag;
 1377 
 1378         switch (le16toh(tag->strat_type)) {
 1379         case 4:
 1380                 break;
 1381 
 1382         case 4096:
 1383                 printf("Cannot deal with strategy4096 yet!\n");
 1384                 return (ENODEV);
 1385 
 1386         default:
 1387                 printf("Unknown strategy type %d\n", tag->strat_type);
 1388                 return (ENODEV);
 1389         }
 1390 
 1391         switch (le16toh(tag->flags) & 0x7) {
 1392         case 0:
 1393                 /*
 1394                  * The allocation descriptor field is filled with short_ad's.
 1395                  * If the offset is beyond the current extent, look for the
 1396                  * next extent.
 1397                  */
 1398                 do {
 1399                         offset -= icblen;
 1400                         ad_offset = sizeof(struct short_ad) * ad_num;
 1401                         if (ad_offset > le32toh(fentry->l_ad)) {
 1402                                 printf("File offset out of bounds\n");
 1403                                 return (EINVAL);
 1404                         }
 1405                         icb = GETICB(short_ad, fentry,
 1406                             le32toh(fentry->l_ea) + ad_offset);
 1407                         icblen = GETICBLEN(short_ad, icb);
 1408                         ad_num++;
 1409                 } while(offset >= icblen);
 1410 
 1411                 lsector = (offset  >> udfmp->bshift) +
 1412                     le32toh(((struct short_ad *)(icb))->pos);
 1413 
 1414                 *max_size = icblen - offset;
 1415 
 1416                 break;
 1417         case 1:
 1418                 /*
 1419                  * The allocation descriptor field is filled with long_ad's
 1420                  * If the offset is beyond the current extent, look for the
 1421                  * next extent.
 1422                  */
 1423                 do {
 1424                         offset -= icblen;
 1425                         ad_offset = sizeof(struct long_ad) * ad_num;
 1426                         if (ad_offset > le32toh(fentry->l_ad)) {
 1427                                 printf("File offset out of bounds\n");
 1428                                 return (EINVAL);
 1429                         }
 1430                         icb = GETICB(long_ad, fentry,
 1431                             le32toh(fentry->l_ea) + ad_offset);
 1432                         icblen = GETICBLEN(long_ad, icb);
 1433                         ad_num++;
 1434                 } while(offset >= icblen);
 1435 
 1436                 lsector = (offset >> udfmp->bshift) +
 1437                     le32toh(((struct long_ad *)(icb))->loc.lb_num);
 1438 
 1439                 *max_size = icblen - offset;
 1440 
 1441                 break;
 1442         case 3:
 1443                 /*
 1444                  * This type means that the file *data* is stored in the
 1445                  * allocation descriptor field of the file entry.
 1446                  */
 1447                 *max_size = 0;
 1448                 *sector = node->hash_id + udfmp->part_start;
 1449 
 1450                 return (UDF_INVALID_BMAP);
 1451         case 2:
 1452                 /* DirectCD does not use extended_ad's */
 1453         default:
 1454                 printf("Unsupported allocation descriptor %d\n",
 1455                        tag->flags & 0x7);
 1456                 return (ENODEV);
 1457         }
 1458 
 1459         *sector = lsector + udfmp->part_start;
 1460 
 1461         /*
 1462          * Check the sparing table.  Each entry represents the beginning of
 1463          * a packet.
 1464          */
 1465         if (udfmp->s_table != NULL) {
 1466                 for (i = 0; i< udfmp->s_table_entries; i++) {
 1467                         p_offset =
 1468                             lsector - le32toh(udfmp->s_table->entries[i].org);
 1469                         if ((p_offset < udfmp->p_sectors) && (p_offset >= 0)) {
 1470                                 *sector =
 1471                                    le32toh(udfmp->s_table->entries[i].map) +
 1472                                     p_offset;
 1473                                 break;
 1474                         }
 1475                 }
 1476         }
 1477 
 1478         return (0);
 1479 }

Cache object: f83d53520eb97240277fcb1a4427722f


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