arch/common/grub2/fs/xfs.c

   1 /* xfs.c - XFS.  */
   2 /*
   3  *  GRUB  --  GRand Unified Bootloader
   4  *  Copyright (C) 2005,2006,2007  Free Software Foundation, Inc.
   5  *
   6  *  GRUB is free software: you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation, either version 3 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  GRUB is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include <grub/err.h>
  21 #include <grub/file.h>
  22 #include <grub/mm.h>
  23 #include <grub/misc.h>
  24 #include <grub/disk.h>
  25 #include <grub/dl.h>
  26 #include <grub/types.h>
  27 #include <grub/fshelp.h>
  28
  29 #define XFS_INODE_EXTENTS       9
  30
  31 #define XFS_INODE_FORMAT_INO    1
  32 #define XFS_INODE_FORMAT_EXT    2
  33 #define XFS_INODE_FORMAT_BTREE  3
  34
  35
  36 struct grub_xfs_sblock
  37 {
  38   grub_uint8_t magic[4];
  39   grub_uint32_t bsize;
  40   grub_uint8_t unused1[48];
  41   grub_uint64_t rootino;
  42   grub_uint8_t unused2[20];
  43   grub_uint32_t agsize;
  44   grub_uint8_t unused3[20];
  45   grub_uint8_t label[12];
  46   grub_uint8_t log2_bsize;
  47   grub_uint8_t unused4[2];
  48   grub_uint8_t log2_inop;
  49   grub_uint8_t log2_agblk;
  50 } __attribute__ ((packed));
  51
  52 struct grub_xfs_dir_header
  53 {
  54   grub_uint8_t entries;
  55   grub_uint8_t smallino;
  56   grub_uint32_t parent;
  57 } __attribute__ ((packed));
  58
  59 struct grub_xfs_dir_entry
  60 {
  61   grub_uint8_t len;
  62   grub_uint16_t offset;
  63   char name[1];
  64   /* Inode number follows, 32 bits.  */
  65 } __attribute__ ((packed));
  66
  67 struct grub_xfs_dir2_entry
  68 {
  69   grub_uint64_t inode;
  70   grub_uint8_t len;
  71 } __attribute__ ((packed));
  72
  73 typedef grub_uint32_t grub_xfs_extent[4];
  74
  75 struct grub_xfs_inode
  76 {
  77   grub_uint8_t magic[2];
  78   grub_uint16_t mode;
  79   grub_uint8_t version;
  80   grub_uint8_t format;
  81   grub_uint8_t unused2[50];
  82   grub_uint64_t size;
  83   grub_uint8_t unused3[36];
  84   union
  85   {
  86     char raw[156];
  87     struct dir
  88     {
  89       struct grub_xfs_dir_header dirhead;
  90       struct grub_xfs_dir_entry direntry[1];
  91     } dir;
  92     grub_xfs_extent extents[XFS_INODE_EXTENTS];
  93   } data __attribute__ ((packed));
  94 } __attribute__ ((packed));
  95
  96 struct grub_xfs_dirblock_tail
  97 {
  98   grub_uint32_t leaf_count;
  99   grub_uint32_t leaf_stale;
 100 } __attribute__ ((packed));
 101
 102 struct grub_fshelp_node
 103 {
 104   struct grub_xfs_data *data;
 105   struct grub_xfs_inode inode;
 106   grub_uint64_t ino;
 107   int inode_read;
 108 };
 109
 110 struct grub_xfs_data
 111 {
 112   struct grub_xfs_sblock sblock;
 113   struct grub_xfs_inode *inode;
 114   grub_disk_t disk;
 115   int pos;
 116   int bsize;
 117   int agsize;
 118   struct grub_fshelp_node diropen;
 119
 120 };
 121
 122 #ifndef GRUB_UTIL
 123 static grub_dl_t my_mod;
 124 #endif
 125
 126 \f
 127
 128 /* Filetype information as used in inodes.  */
 129 #define FILETYPE_INO_MASK       0170000
 130 #define FILETYPE_INO_REG        0100000
 131 #define FILETYPE_INO_DIRECTORY  0040000
 132 #define FILETYPE_INO_SYMLINK    0120000
 133
 134 #define GRUB_XFS_INO_AGBITS(data)               \
 135   ((data)->sblock.log2_agblk + (data)->sblock.log2_inop)
 136 #define GRUB_XFS_INO_INOINAG(data, ino)         \
 137   (grub_be_to_cpu64 (ino) & ((1 << GRUB_XFS_INO_AGBITS (data)) - 1))
 138 #define GRUB_XFS_INO_AG(data,ino)               \
 139   (grub_be_to_cpu64 (ino) >> GRUB_XFS_INO_AGBITS (data))
 140
 141 #define GRUB_XFS_EXTENT_OFFSET(inode,ex) \
 142         ((grub_be_to_cpu32 ((inode)->data.extents[ex][0]) & ~(1 << 31)) << 23 \
 143         | grub_be_to_cpu32 ((inode)->data.extents[ex][1]) >> 9)
 144
 145 #define GRUB_XFS_EXTENT_BLOCK(inode,ex)         \
 146   ((grub_uint64_t) (grub_be_to_cpu32 ((inode)->data.extents[ex][1]) \
 147                   & (~255)) << 43 \
 148    | (grub_uint64_t) grub_be_to_cpu32 ((inode)->data.extents[ex][2]) << 11 \
 149    | grub_be_to_cpu32 ((inode)->data.extents[ex][3]) >> 21)
 150
 151 #define GRUB_XFS_EXTENT_SIZE(inode,ex)          \
 152   (grub_be_to_cpu32 ((inode)->data.extents[ex][3]) & ((1 << 20) - 1))
 153
 154 #define GRUB_XFS_ROUND_TO_DIRENT(pos)   ((((pos) + 8 - 1) / 8) * 8)
 155 #define GRUB_XFS_NEXT_DIRENT(pos,len)           \
 156   (pos) + GRUB_XFS_ROUND_TO_DIRENT (8 + 1 + len + 2)
 157 \f
 158 static inline int
 159 grub_xfs_inode_block (struct grub_xfs_data *data,
 160                       grub_uint64_t ino)
 161 {
 162   long long int inoinag = GRUB_XFS_INO_INOINAG (data, ino);
 163   long long ag = GRUB_XFS_INO_AG (data, ino);
 164   long long block;
 165
 166   block = (inoinag >> 4) + ag * data->agsize;
 167   block <<= (data->sblock.log2_bsize - GRUB_DISK_SECTOR_BITS);
 168   return block;
 169 }
 170
 171
 172 static inline int
 173 grub_xfs_inode_offset (struct grub_xfs_data *data,
 174                        grub_uint64_t ino)
 175 {
 176   int inoag = GRUB_XFS_INO_INOINAG (data, ino);
 177   return (inoag & ((1 << 4) - 1)) << 8;
 178 }
 179
 180
 181 static grub_err_t
 182 grub_xfs_read_inode (struct grub_xfs_data *data, grub_uint64_t ino,
 183                      struct grub_xfs_inode *inode)
 184 {
 185   int block = grub_xfs_inode_block (data, ino);
 186   int offset = grub_xfs_inode_offset (data, ino);
 187
 188   /* Read the inode.  */
 189   if (grub_disk_read (data->disk, block, offset,
 190                       sizeof (struct grub_xfs_inode), (char *) inode))
 191     return grub_errno;
 192
 193   if (grub_strncmp ((char *) inode->magic, "IN", 2))
 194     return grub_error (GRUB_ERR_BAD_FS, "not a correct XFS inode.\n");
 195
 196   return 0;
 197 }
 198
 199
 200 static int
 201 grub_xfs_read_block (grub_fshelp_node_t node, int fileblock)
 202 {
 203   int ex;
 204
 205   if (node->inode.format != XFS_INODE_FORMAT_EXT)
 206     {
 207       grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET,
 208                   "xfs does not support inode format %d yet",
 209                   node->inode.format);
 210       return 0;
 211     }
 212
 213   /* Iterate over each extent to figure out which extent has
 214      the block we are looking for.  */
 215   for (ex = 0; ex < XFS_INODE_EXTENTS; ex++)
 216     {
 217       grub_uint64_t start = GRUB_XFS_EXTENT_BLOCK (&node->inode, ex);
 218       int offset = GRUB_XFS_EXTENT_OFFSET (&node->inode, ex);
 219       int size = GRUB_XFS_EXTENT_SIZE (&node->inode, ex);
 220
 221       unsigned int ag = start >> node->data->sblock.log2_agblk;
 222       unsigned int block = start & ((1 << node->data->sblock.log2_agblk) - 1);
 223
 224       if (fileblock < offset + size)
 225         return (fileblock - offset + block) + ag * node->data->agsize;
 226     }
 227
 228   grub_error (GRUB_ERR_FILE_READ_ERROR,
 229               "xfs block %d for inode %d is not in an extent.\n",
 230               fileblock, grub_be_to_cpu64 (node->ino));
 231   return 0;
 232 }
 233
 234
 235 /* Read LEN bytes from the file described by DATA starting with byte
 236    POS.  Return the amount of read bytes in READ.  */
 237 static grub_ssize_t
 238 grub_xfs_read_file (grub_fshelp_node_t node,
 239                      void NESTED_FUNC_ATTR (*read_hook) (grub_disk_addr_t sector,
 240                                         unsigned offset, unsigned length),
 241                      int pos, grub_size_t len, char *buf)
 242 {
 243   return grub_fshelp_read_file (node->data->disk, node, read_hook,
 244                                 pos, len, buf, grub_xfs_read_block,
 245                                 grub_be_to_cpu64 (node->inode.size),
 246                                 node->data->sblock.log2_bsize
 247                                 - GRUB_DISK_SECTOR_BITS);
 248 }
 249
 250
 251 static char *
 252 grub_xfs_read_symlink (grub_fshelp_node_t node)
 253 {
 254   int size = grub_be_to_cpu64 (node->inode.size);
 255
 256   switch (node->inode.format)
 257     {
 258     case XFS_INODE_FORMAT_INO:
 259       return grub_strndup (node->inode.data.raw, size);
 260
 261     case XFS_INODE_FORMAT_EXT:
 262       {
 263         char *symlink;
 264         grub_ssize_t numread;
 265
 266         symlink = grub_malloc (size + 1);
 267         if (!symlink)
 268           return 0;
 269
 270         numread = grub_xfs_read_file (node, 0, 0, size, symlink);
 271         if (numread != size)
 272           {
 273             grub_free (symlink);
 274             return 0;
 275           }
 276         symlink[size] = '\0';
 277         return symlink;
 278       }
 279     }
 280
 281   return 0;
 282 }
 283
 284
 285 static enum grub_fshelp_filetype
 286 grub_xfs_mode_to_filetype (grub_uint16_t mode)
 287 {
 288   if ((grub_be_to_cpu16 (mode)
 289        & FILETYPE_INO_MASK) == FILETYPE_INO_DIRECTORY)
 290     return GRUB_FSHELP_DIR;
 291   else if ((grub_be_to_cpu16 (mode)
 292             & FILETYPE_INO_MASK) == FILETYPE_INO_SYMLINK)
 293     return GRUB_FSHELP_SYMLINK;
 294   else if ((grub_be_to_cpu16 (mode)
 295             & FILETYPE_INO_MASK) == FILETYPE_INO_REG)
 296     return GRUB_FSHELP_REG;
 297   return GRUB_FSHELP_UNKNOWN;
 298 }
 299
 300
 301 static int
 302 grub_xfs_iterate_dir (grub_fshelp_node_t dir,
 303                        int NESTED_FUNC_ATTR
 304                        (*hook) (const char *filename,
 305                                 enum grub_fshelp_filetype filetype,
 306                                 grub_fshelp_node_t node))
 307 {
 308   struct grub_fshelp_node *diro = (struct grub_fshelp_node *) dir;
 309   auto int call_hook (grub_uint64_t ino, char *filename);
 310
 311   int call_hook (grub_uint64_t ino, char *filename)
 312     {
 313       struct grub_fshelp_node *fdiro;
 314
 315       fdiro = grub_malloc (sizeof (struct grub_fshelp_node));
 316       if (!fdiro)
 317         return 0;
 318
 319       /* The inode should be read, otherwise the filetype can
 320          not be determined.  */
 321       fdiro->ino = ino;
 322       fdiro->inode_read = 1;
 323       fdiro->data = diro->data;
 324       grub_xfs_read_inode (diro->data, ino, &fdiro->inode);
 325
 326       return hook (filename,
 327                    grub_xfs_mode_to_filetype (fdiro->inode.mode),
 328                    fdiro);
 329     }
 330
 331   switch (diro->inode.format)
 332     {
 333     case XFS_INODE_FORMAT_INO:
 334       {
 335         struct grub_xfs_dir_entry *de = &diro->inode.data.dir.direntry[0];
 336         int smallino = !diro->inode.data.dir.dirhead.smallino;
 337         int i;
 338         grub_uint64_t parent;
 339
 340         /* If small inode numbers are used to pack the direntry, the
 341            parent inode number is small too.  */
 342         if (smallino)
 343           {
 344             parent = grub_be_to_cpu32 (diro->inode.data.dir.dirhead.parent);
 345             parent = grub_cpu_to_be64 (parent);
 346           }
 347         else
 348           {
 349             parent = *(grub_uint64_t *) &diro->inode.data.dir.dirhead.parent;
 350             /* The header is a bit bigger than usual.  */
 351             de = (struct grub_xfs_dir_entry *) ((char *) de + 4);
 352           }
 353
 354         /* Synthesize the direntries for `.' and `..'.  */
 355         if (call_hook (diro->ino, "."))
 356           return 1;
 357
 358         if (call_hook (parent, ".."))
 359           return 1;
 360
 361         for (i = 0; i < diro->inode.data.dir.dirhead.entries; i++)
 362           {
 363             grub_uint64_t ino;
 364             void *inopos = (((char *) de)
 365                             + sizeof (struct grub_xfs_dir_entry)
 366                             + de->len - 1);
 367             char name[de->len + 1];
 368
 369             if (smallino)
 370               {
 371                 ino = grub_be_to_cpu32 (*(grub_uint32_t *) inopos);
 372                 ino = grub_cpu_to_be64 (ino);
 373               }
 374             else
 375               ino = *(grub_uint64_t *) inopos;
 376
 377             grub_memcpy (name, de->name, de->len);
 378             name[de->len] = '\0';
 379             if (call_hook (ino, name))
 380               return 1;
 381
 382             de = ((struct grub_xfs_dir_entry *)
 383                   (((char *) de)+ sizeof (struct grub_xfs_dir_entry) + de->len
 384                    + ((smallino ? sizeof (grub_uint32_t)
 385                        : sizeof (grub_uint64_t))) - 1));
 386           }
 387         break;
 388       }
 389
 390     case XFS_INODE_FORMAT_BTREE:
 391     case XFS_INODE_FORMAT_EXT:
 392       {
 393         grub_ssize_t numread;
 394         char *dirblock;
 395         grub_uint64_t blk;
 396
 397         dirblock = grub_malloc (dir->data->bsize);
 398         if (! dirblock)
 399           return 0;
 400
 401         /* Iterate over every block the directory has.  */
 402         for (blk = 0;
 403              blk < (grub_be_to_cpu64 (dir->inode.size)
 404                     >> dir->data->sblock.log2_bsize);
 405              blk++)
 406           {
 407             /* The header is skipped, the first direntry is stored
 408                from byte 16.  */
 409             int pos = 16;
 410             int entries;
 411             int tail_start = (dir->data->bsize
 412                               - sizeof (struct grub_xfs_dirblock_tail));
 413
 414             struct grub_xfs_dirblock_tail *tail;
 415             tail = (struct grub_xfs_dirblock_tail *) &dirblock[tail_start];
 416
 417             numread = grub_xfs_read_file (dir, 0,
 418                                           blk << dir->data->sblock.log2_bsize,
 419                                           dir->data->bsize, dirblock);
 420             if (numread != dir->data->bsize)
 421               return 0;
 422
 423             entries = (grub_be_to_cpu32 (tail->leaf_count)
 424                        - grub_be_to_cpu32 (tail->leaf_stale));
 425
 426             /* Iterate over all entries within this block.  */
 427             while (pos < (dir->data->bsize
 428                           - (int) sizeof (struct grub_xfs_dir2_entry)))
 429               {
 430                 struct grub_xfs_dir2_entry *direntry;
 431                 grub_uint16_t *freetag;
 432                 char *filename;
 433
 434                 direntry = (struct grub_xfs_dir2_entry *) &dirblock[pos];
 435                 freetag = (grub_uint16_t *) direntry;
 436
 437                 if (*freetag == 0XFFFF)
 438                   {
 439                     grub_uint16_t *skip = (grub_uint16_t *) (freetag + 1);
 440
 441                     /* This entry is not used, go to the next one.  */
 442                     pos += grub_be_to_cpu16 (*skip);
 443
 444                     continue;
 445                   }
 446
 447                 filename = &dirblock[pos + sizeof (*direntry)];
 448                 /* The byte after the filename is for the tag, which
 449                    is not used by GRUB.  So it can be overwritten.  */
 450                 filename[direntry->len] = '\0';
 451
 452                 if (call_hook (direntry->inode, filename))
 453                   {
 454                     grub_free (dirblock);
 455                     return 1;
 456                   }
 457
 458                 /* Check if last direntry in this block is
 459                    reached.  */
 460                 entries--;
 461                 if (!entries)
 462                   break;
 463
 464                 /* Select the next directory entry.  */
 465                 pos = GRUB_XFS_NEXT_DIRENT (pos, direntry->len);
 466                 pos = GRUB_XFS_ROUND_TO_DIRENT (pos);
 467               }
 468           }
 469         grub_free (dirblock);
 470         break;
 471       }
 472
 473     default:
 474       grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET,
 475                   "xfs does not support inode format %d yet",
 476                   diro->inode.format);
 477     }
 478   return 0;
 479 }
 480
 481
 482 static struct grub_xfs_data *
 483 grub_xfs_mount (grub_disk_t disk)
 484 {
 485   struct grub_xfs_data *data = 0;
 486
 487   data = grub_malloc (sizeof (struct grub_xfs_data));
 488   if (!data)
 489     return 0;
 490
 491   /* Read the superblock.  */
 492   if (grub_disk_read (disk, 0, 0,
 493                       sizeof (struct grub_xfs_sblock), (char *) &data->sblock))
 494     goto fail;
 495
 496   if (grub_strncmp ((char *) (data->sblock.magic), "XFSB", 4))
 497     {
 498       grub_error (GRUB_ERR_BAD_FS, "not a xfs filesystem");
 499       goto fail;
 500     }
 501
 502   data->diropen.data = data;
 503   data->diropen.ino = data->sblock.rootino;
 504   data->diropen.inode_read = 1;
 505   data->bsize = grub_be_to_cpu32 (data->sblock.bsize);
 506   data->agsize = grub_be_to_cpu32 (data->sblock.agsize);
 507
 508   data->disk = disk;
 509   data->inode = &data->diropen.inode;
 510   data->pos = 0;
 511
 512   grub_xfs_read_inode (data, data->diropen.ino, data->inode);
 513
 514   return data;
 515  fail:
 516
 517   if (grub_errno == GRUB_ERR_OUT_OF_RANGE)
 518     grub_error (GRUB_ERR_BAD_FS, "not an xfs filesystem");
 519
 520   grub_free (data);
 521
 522   return 0;
 523 }
 524
 525 \f
 526 static grub_err_t
 527 grub_xfs_dir (grub_device_t device, const char *path,
 528               int (*hook) (const char *filename, int dir))
 529 {
 530   struct grub_xfs_data *data = 0;;
 531   struct grub_fshelp_node *fdiro = 0;
 532
 533   auto int NESTED_FUNC_ATTR iterate (const char *filename,
 534                                      enum grub_fshelp_filetype filetype,
 535                                      grub_fshelp_node_t node);
 536
 537   int NESTED_FUNC_ATTR iterate (const char *filename,
 538                                 enum grub_fshelp_filetype filetype,
 539                                 grub_fshelp_node_t node)
 540     {
 541       grub_free (node);
 542
 543       if (filetype == GRUB_FSHELP_DIR)
 544         return hook (filename, 1);
 545       else
 546         return hook (filename, 0);
 547
 548       return 0;
 549     }
 550
 551 #ifndef GRUB_UTIL
 552   grub_dl_ref (my_mod);
 553 #endif
 554
 555   data = grub_xfs_mount (device->disk);
 556   if (!data)
 557     goto fail;
 558
 559   grub_fshelp_find_file (path, &data->diropen, &fdiro, grub_xfs_iterate_dir,
 560                          grub_xfs_read_symlink, GRUB_FSHELP_DIR);
 561   if (grub_errno)
 562     goto fail;
 563
 564   grub_xfs_iterate_dir (fdiro, iterate);
 565
 566  fail:
 567   if (fdiro != &data->diropen)
 568     grub_free (fdiro);
 569   grub_free (data);
 570
 571 #ifndef GRUB_UTIL
 572   grub_dl_unref (my_mod);
 573 #endif
 574
 575   return grub_errno;
 576
 577   return 0;
 578 }
 579
 580
 581 /* Open a file named NAME and initialize FILE.  */
 582 static grub_err_t
 583 grub_xfs_open (struct grub_file *file, const char *name)
 584 {
 585   struct grub_xfs_data *data;
 586   struct grub_fshelp_node *fdiro = 0;
 587
 588 #ifndef GRUB_UTIL
 589   grub_dl_ref (my_mod);
 590 #endif
 591
 592   data = grub_xfs_mount (file->device->disk);
 593   if (!data)
 594     goto fail;
 595
 596   grub_fshelp_find_file (name, &data->diropen, &fdiro, grub_xfs_iterate_dir,
 597                          grub_xfs_read_symlink, GRUB_FSHELP_REG);
 598   if (grub_errno)
 599     goto fail;
 600
 601   if (!fdiro->inode_read)
 602     {
 603       grub_xfs_read_inode (data, fdiro->ino, &fdiro->inode);
 604       if (grub_errno)
 605         goto fail;
 606     }
 607
 608   grub_memcpy (data->inode,
 609                &fdiro->inode,
 610                sizeof (struct grub_xfs_inode));
 611   grub_free (fdiro);
 612
 613   file->size = grub_be_to_cpu64 (data->inode->size);
 614   file->data = data;
 615   file->offset = 0;
 616
 617   return 0;
 618
 619  fail:
 620   if (fdiro != &data->diropen)
 621     grub_free (fdiro);
 622   grub_free (data);
 623
 624 #ifndef GRUB_UTIL
 625   grub_dl_unref (my_mod);
 626 #endif
 627
 628   return grub_errno;
 629 }
 630
 631
 632 static grub_ssize_t
 633 grub_xfs_read (grub_file_t file, char *buf, grub_size_t len)
 634 {
 635   struct grub_xfs_data *data =
 636     (struct grub_xfs_data *) file->data;
 637
 638   return grub_xfs_read_file (&data->diropen, file->read_hook,
 639                               file->offset, len, buf);
 640 }
 641
 642
 643 static grub_err_t
 644 grub_xfs_close (grub_file_t file)
 645 {
 646   grub_free (file->data);
 647
 648 #ifndef GRUB_UTIL
 649   grub_dl_unref (my_mod);
 650 #endif
 651
 652   return GRUB_ERR_NONE;
 653 }
 654
 655
 656 static grub_err_t
 657 grub_xfs_label (grub_device_t device, char **label)
 658 {
 659   struct grub_xfs_data *data;
 660   grub_disk_t disk = device->disk;
 661
 662 #ifndef GRUB_UTIL
 663   grub_dl_ref (my_mod);
 664 #endif
 665
 666   data = grub_xfs_mount (disk);
 667   if (data)
 668     *label = grub_strndup ((char *) (data->sblock.label), 12);
 669   else
 670     *label = 0;
 671
 672 #ifndef GRUB_UTIL
 673   grub_dl_unref (my_mod);
 674 #endif
 675
 676   grub_free (data);
 677
 678   return grub_errno;
 679 }
 680
 681 \f
 682
 683 static struct grub_fs grub_xfs_fs =
 684   {
 685     .name = "xfs",
 686     .dir = grub_xfs_dir,
 687     .open = grub_xfs_open,
 688     .read = grub_xfs_read,
 689     .close = grub_xfs_close,
 690     .label = grub_xfs_label,
 691     .next = 0
 692   };
 693
 694 GRUB_MOD_INIT(xfs)
 695 {
 696   grub_fs_register (&grub_xfs_fs);
 697 #ifndef GRUB_UTIL
 698   my_mod = mod;
 699 #endif
 700 }
 701
 702 GRUB_MOD_FINI(xfs)
 703 {
 704   grub_fs_unregister (&grub_xfs_fs);
 705 }
 706