fs/xfs.c

   1 /* xfs.c - XFS.  */
   2 /*
   3  *  GRUB  --  GRand Unified Bootloader
   4  *  Copyright (C) 2005,2006,2007,2008  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[24];
  41   grub_uint16_t uuid[8];
  42   grub_uint8_t unused2[8];
  43   grub_uint64_t rootino;
  44   grub_uint8_t unused3[20];
  45   grub_uint32_t agsize;
  46   grub_uint8_t unused4[20];
  47   grub_uint8_t label[12];
  48   grub_uint8_t log2_bsize;
  49   grub_uint8_t log2_sect;
  50   grub_uint8_t log2_inode;
  51   grub_uint8_t log2_inop;
  52   grub_uint8_t log2_agblk;
  53   grub_uint8_t unused6[67];
  54   grub_uint8_t log2_dirblk;
  55 } __attribute__ ((packed));
  56
  57 struct grub_xfs_dir_header
  58 {
  59   grub_uint8_t count;
  60   grub_uint8_t smallino;
  61   union
  62   {
  63     grub_uint32_t i4;
  64     grub_uint64_t i8;
  65   } parent __attribute__ ((packed));
  66 } __attribute__ ((packed));
  67
  68 struct grub_xfs_dir_entry
  69 {
  70   grub_uint8_t len;
  71   grub_uint16_t offset;
  72   char name[1];
  73   /* Inode number follows, 32 bits.  */
  74 } __attribute__ ((packed));
  75
  76 struct grub_xfs_dir2_entry
  77 {
  78   grub_uint64_t inode;
  79   grub_uint8_t len;
  80 } __attribute__ ((packed));
  81
  82 typedef grub_uint32_t grub_xfs_extent[4];
  83
  84 struct grub_xfs_btree_node
  85 {
  86   grub_uint8_t magic[4];
  87   grub_uint16_t level;
  88   grub_uint16_t numrecs;
  89   grub_uint64_t left;
  90   grub_uint64_t right;
  91   grub_uint64_t keys[1];
  92 }  __attribute__ ((packed));
  93
  94 struct grub_xfs_btree_root
  95 {
  96   grub_uint16_t level;
  97   grub_uint16_t numrecs;
  98   grub_uint64_t keys[1];
  99 }  __attribute__ ((packed));
 100
 101 struct grub_xfs_inode
 102 {
 103   grub_uint8_t magic[2];
 104   grub_uint16_t mode;
 105   grub_uint8_t version;
 106   grub_uint8_t format;
 107   grub_uint8_t unused2[50];
 108   grub_uint64_t size;
 109   grub_uint64_t nblocks;
 110   grub_uint32_t extsize;
 111   grub_uint32_t nextents;
 112   grub_uint8_t unused3[20];
 113   union
 114   {
 115     char raw[156];
 116     struct dir
 117     {
 118       struct grub_xfs_dir_header dirhead;
 119       struct grub_xfs_dir_entry direntry[1];
 120     } dir;
 121     grub_xfs_extent extents[XFS_INODE_EXTENTS];
 122     struct grub_xfs_btree_root btree;
 123   } data __attribute__ ((packed));
 124 } __attribute__ ((packed));
 125
 126 struct grub_xfs_dirblock_tail
 127 {
 128   grub_uint32_t leaf_count;
 129   grub_uint32_t leaf_stale;
 130 } __attribute__ ((packed));
 131
 132 struct grub_fshelp_node
 133 {
 134   struct grub_xfs_data *data;
 135   grub_uint64_t ino;
 136   int inode_read;
 137   struct grub_xfs_inode inode;
 138 };
 139
 140 struct grub_xfs_data
 141 {
 142   struct grub_xfs_sblock sblock;
 143   grub_disk_t disk;
 144   int pos;
 145   int bsize;
 146   int agsize;
 147   struct grub_fshelp_node diropen;
 148 };
 149
 150 static grub_dl_t my_mod;
 151
 152 \f
 153
 154 /* Filetype information as used in inodes.  */
 155 #define FILETYPE_INO_MASK       0170000
 156 #define FILETYPE_INO_REG        0100000
 157 #define FILETYPE_INO_DIRECTORY  0040000
 158 #define FILETYPE_INO_SYMLINK    0120000
 159
 160 #define GRUB_XFS_INO_AGBITS(data)               \
 161   ((data)->sblock.log2_agblk + (data)->sblock.log2_inop)
 162 #define GRUB_XFS_INO_INOINAG(data, ino)         \
 163   (grub_be_to_cpu64 (ino) & ((1LL << GRUB_XFS_INO_AGBITS (data)) - 1))
 164 #define GRUB_XFS_INO_AG(data,ino)               \
 165   (grub_be_to_cpu64 (ino) >> GRUB_XFS_INO_AGBITS (data))
 166
 167 #define GRUB_XFS_FSB_TO_BLOCK(data, fsb) \
 168   (((fsb) >> (data)->sblock.log2_agblk) * (data)->agsize \
 169  + ((fsb) & ((1LL << (data)->sblock.log2_agblk) - 1)))
 170
 171 #define GRUB_XFS_EXTENT_OFFSET(exts,ex) \
 172         ((grub_be_to_cpu32 (exts[ex][0]) & ~(1 << 31)) << 23 \
 173         | grub_be_to_cpu32 (exts[ex][1]) >> 9)
 174
 175 #define GRUB_XFS_EXTENT_BLOCK(exts,ex)          \
 176   ((grub_uint64_t) (grub_be_to_cpu32 (exts[ex][1]) \
 177                   & (0x1ff)) << 43 \
 178    | (grub_uint64_t) grub_be_to_cpu32 (exts[ex][2]) << 11 \
 179    | grub_be_to_cpu32 (exts[ex][3]) >> 21)
 180
 181 #define GRUB_XFS_EXTENT_SIZE(exts,ex)           \
 182   (grub_be_to_cpu32 (exts[ex][3]) & ((1 << 20) - 1))
 183
 184 #define GRUB_XFS_ROUND_TO_DIRENT(pos)   ((((pos) + 8 - 1) / 8) * 8)
 185 #define GRUB_XFS_NEXT_DIRENT(pos,len)           \
 186   (pos) + GRUB_XFS_ROUND_TO_DIRENT (8 + 1 + len + 2)
 187 \f
 188 static inline grub_uint64_t
 189 grub_xfs_inode_block (struct grub_xfs_data *data,
 190                       grub_uint64_t ino)
 191 {
 192   long long int inoinag = GRUB_XFS_INO_INOINAG (data, ino);
 193   long long ag = GRUB_XFS_INO_AG (data, ino);
 194   long long block;
 195
 196   block = (inoinag >> data->sblock.log2_inop) + ag * data->agsize;
 197   block <<= (data->sblock.log2_bsize - GRUB_DISK_SECTOR_BITS);
 198   return block;
 199 }
 200
 201
 202 static inline int
 203 grub_xfs_inode_offset (struct grub_xfs_data *data,
 204                        grub_uint64_t ino)
 205 {
 206   int inoag = GRUB_XFS_INO_INOINAG (data, ino);
 207   return ((inoag & ((1 << data->sblock.log2_inop) - 1)) <<
 208           data->sblock.log2_inode);
 209 }
 210
 211
 212 static grub_err_t
 213 grub_xfs_read_inode (struct grub_xfs_data *data, grub_uint64_t ino,
 214                      struct grub_xfs_inode *inode)
 215 {
 216   grub_uint64_t block = grub_xfs_inode_block (data, ino);
 217   int offset = grub_xfs_inode_offset (data, ino);
 218
 219   /* Read the inode.  */
 220   if (grub_disk_read (data->disk, block, offset,
 221                       1 << data->sblock.log2_inode, inode))
 222     return grub_errno;
 223
 224   if (grub_strncmp ((char *) inode->magic, "IN", 2))
 225     return grub_error (GRUB_ERR_BAD_FS, "not a correct XFS inode.\n");
 226
 227   return 0;
 228 }
 229
 230
 231 static grub_disk_addr_t
 232 grub_xfs_read_block (grub_fshelp_node_t node, grub_disk_addr_t fileblock)
 233 {
 234   struct grub_xfs_btree_node *leaf = 0;
 235   int ex, nrec;
 236   grub_xfs_extent *exts;
 237   grub_uint64_t ret = 0;
 238
 239   if (node->inode.format == XFS_INODE_FORMAT_BTREE)
 240     {
 241       grub_uint64_t *keys;
 242
 243       leaf = grub_malloc (node->data->sblock.bsize);
 244       if (leaf == 0)
 245         return 0;
 246
 247       nrec = grub_be_to_cpu16 (node->inode.data.btree.numrecs);
 248       keys = &node->inode.data.btree.keys[0];
 249       do
 250         {
 251           int i;
 252
 253           for (i = 0; i < nrec; i++)
 254             {
 255               if (fileblock < grub_be_to_cpu64 (keys[i]))
 256                 break;
 257             }
 258
 259           /* Sparse block.  */
 260           if (i == 0)
 261             {
 262               grub_free (leaf);
 263               return 0;
 264             }
 265
 266           if (grub_disk_read (node->data->disk,
 267                               grub_be_to_cpu64 (keys[i - 1 + nrec])
 268                               << (node->data->sblock.log2_bsize
 269                                   - GRUB_DISK_SECTOR_BITS),
 270                               0, node->data->sblock.bsize, leaf))
 271             return 0;
 272
 273           if (grub_strncmp ((char *) leaf->magic, "BMAP", 4))
 274             {
 275               grub_free (leaf);
 276               grub_error (GRUB_ERR_BAD_FS, "not a correct XFS BMAP node.\n");
 277               return 0;
 278             }
 279
 280           nrec = grub_be_to_cpu16 (leaf->numrecs);
 281           keys = &leaf->keys[0];
 282         } while (leaf->level);
 283       exts = (grub_xfs_extent *) keys;
 284     }
 285   else if (node->inode.format == XFS_INODE_FORMAT_EXT)
 286     {
 287       nrec = grub_be_to_cpu32 (node->inode.nextents);
 288       exts = &node->inode.data.extents[0];
 289     }
 290   else
 291     {
 292       grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET,
 293                   "xfs does not support inode format %d yet",
 294                   node->inode.format);
 295       return 0;
 296     }
 297
 298   /* Iterate over each extent to figure out which extent has
 299      the block we are looking for.  */
 300   for (ex = 0; ex < nrec; ex++)
 301     {
 302       grub_uint64_t start = GRUB_XFS_EXTENT_BLOCK (exts, ex);
 303       grub_uint64_t offset = GRUB_XFS_EXTENT_OFFSET (exts, ex);
 304       grub_uint64_t size = GRUB_XFS_EXTENT_SIZE (exts, ex);
 305
 306       /* Sparse block.  */
 307       if (fileblock < offset)
 308         break;
 309       else if (fileblock < offset + size)
 310         {
 311           ret = (fileblock - offset + start);
 312           break;
 313         }
 314     }
 315
 316   if (leaf)
 317     grub_free (leaf);
 318
 319   return GRUB_XFS_FSB_TO_BLOCK(node->data, ret);
 320 }
 321
 322
 323 /* Read LEN bytes from the file described by DATA starting with byte
 324    POS.  Return the amount of read bytes in READ.  */
 325 static grub_ssize_t
 326 grub_xfs_read_file (grub_fshelp_node_t node,
 327                      void NESTED_FUNC_ATTR (*read_hook) (grub_disk_addr_t sector,
 328                                         unsigned offset, unsigned length),
 329                      int pos, grub_size_t len, char *buf)
 330 {
 331   return grub_fshelp_read_file (node->data->disk, node, read_hook,
 332                                 pos, len, buf, grub_xfs_read_block,
 333                                 grub_be_to_cpu64 (node->inode.size),
 334                                 node->data->sblock.log2_bsize
 335                                 - GRUB_DISK_SECTOR_BITS);
 336 }
 337
 338
 339 static char *
 340 grub_xfs_read_symlink (grub_fshelp_node_t node)
 341 {
 342   int size = grub_be_to_cpu64 (node->inode.size);
 343
 344   switch (node->inode.format)
 345     {
 346     case XFS_INODE_FORMAT_INO:
 347       return grub_strndup (node->inode.data.raw, size);
 348
 349     case XFS_INODE_FORMAT_EXT:
 350       {
 351         char *symlink;
 352         grub_ssize_t numread;
 353
 354         symlink = grub_malloc (size + 1);
 355         if (!symlink)
 356           return 0;
 357
 358         numread = grub_xfs_read_file (node, 0, 0, size, symlink);
 359         if (numread != size)
 360           {
 361             grub_free (symlink);
 362             return 0;
 363           }
 364         symlink[size] = '\0';
 365         return symlink;
 366       }
 367     }
 368
 369   return 0;
 370 }
 371
 372
 373 static enum grub_fshelp_filetype
 374 grub_xfs_mode_to_filetype (grub_uint16_t mode)
 375 {
 376   if ((grub_be_to_cpu16 (mode)
 377        & FILETYPE_INO_MASK) == FILETYPE_INO_DIRECTORY)
 378     return GRUB_FSHELP_DIR;
 379   else if ((grub_be_to_cpu16 (mode)
 380             & FILETYPE_INO_MASK) == FILETYPE_INO_SYMLINK)
 381     return GRUB_FSHELP_SYMLINK;
 382   else if ((grub_be_to_cpu16 (mode)
 383             & FILETYPE_INO_MASK) == FILETYPE_INO_REG)
 384     return GRUB_FSHELP_REG;
 385   return GRUB_FSHELP_UNKNOWN;
 386 }
 387
 388
 389 static int
 390 grub_xfs_iterate_dir (grub_fshelp_node_t dir,
 391                        int NESTED_FUNC_ATTR
 392                        (*hook) (const char *filename,
 393                                 enum grub_fshelp_filetype filetype,
 394                                 grub_fshelp_node_t node))
 395 {
 396   struct grub_fshelp_node *diro = (struct grub_fshelp_node *) dir;
 397   auto int NESTED_FUNC_ATTR call_hook (grub_uint64_t ino, char *filename);
 398
 399   int NESTED_FUNC_ATTR call_hook (grub_uint64_t ino, char *filename)
 400     {
 401       struct grub_fshelp_node *fdiro;
 402
 403       fdiro = grub_malloc (sizeof (struct grub_fshelp_node)
 404                            - sizeof (struct grub_xfs_inode)
 405                            + (1 << diro->data->sblock.log2_inode));
 406       if (!fdiro)
 407         return 0;
 408
 409       /* The inode should be read, otherwise the filetype can
 410          not be determined.  */
 411       fdiro->ino = ino;
 412       fdiro->inode_read = 1;
 413       fdiro->data = diro->data;
 414       grub_xfs_read_inode (diro->data, ino, &fdiro->inode);
 415
 416       return hook (filename,
 417                    grub_xfs_mode_to_filetype (fdiro->inode.mode),
 418                    fdiro);
 419     }
 420
 421   switch (diro->inode.format)
 422     {
 423     case XFS_INODE_FORMAT_INO:
 424       {
 425         struct grub_xfs_dir_entry *de = &diro->inode.data.dir.direntry[0];
 426         int smallino = !diro->inode.data.dir.dirhead.smallino;
 427         int i;
 428         grub_uint64_t parent;
 429
 430         /* If small inode numbers are used to pack the direntry, the
 431            parent inode number is small too.  */
 432         if (smallino)
 433           {
 434             parent = grub_be_to_cpu32 (diro->inode.data.dir.dirhead.parent.i4);
 435             parent = grub_cpu_to_be64 (parent);
 436             /* The header is a bit smaller than usual.  */
 437             de = (struct grub_xfs_dir_entry *) ((char *) de - 4);
 438           }
 439         else
 440           {
 441             parent = diro->inode.data.dir.dirhead.parent.i8;
 442           }
 443
 444         /* Synthesize the direntries for `.' and `..'.  */
 445         if (call_hook (diro->ino, "."))
 446           return 1;
 447
 448         if (call_hook (parent, ".."))
 449           return 1;
 450
 451         for (i = 0; i < diro->inode.data.dir.dirhead.count; i++)
 452           {
 453             grub_uint64_t ino;
 454             void *inopos = (((char *) de)
 455                             + sizeof (struct grub_xfs_dir_entry)
 456                             + de->len - 1);
 457             char name[de->len + 1];
 458
 459             if (smallino)
 460               {
 461                 ino = grub_be_to_cpu32 (*(grub_uint32_t *) inopos);
 462                 ino = grub_cpu_to_be64 (ino);
 463               }
 464             else
 465               ino = *(grub_uint64_t *) inopos;
 466
 467             grub_memcpy (name, de->name, de->len);
 468             name[de->len] = '\0';
 469             if (call_hook (ino, name))
 470               return 1;
 471
 472             de = ((struct grub_xfs_dir_entry *)
 473                   (((char *) de)+ sizeof (struct grub_xfs_dir_entry) + de->len
 474                    + ((smallino ? sizeof (grub_uint32_t)
 475                        : sizeof (grub_uint64_t))) - 1));
 476           }
 477         break;
 478       }
 479
 480     case XFS_INODE_FORMAT_BTREE:
 481     case XFS_INODE_FORMAT_EXT:
 482       {
 483         grub_ssize_t numread;
 484         char *dirblock;
 485         grub_uint64_t blk;
 486         int dirblk_size, dirblk_log2;
 487
 488         dirblk_log2 = (dir->data->sblock.log2_bsize
 489                        + dir->data->sblock.log2_dirblk);
 490         dirblk_size = 1 << dirblk_log2;
 491
 492         dirblock = grub_malloc (dirblk_size);
 493         if (! dirblock)
 494           return 0;
 495
 496         /* Iterate over every block the directory has.  */
 497         for (blk = 0;
 498              blk < (grub_be_to_cpu64 (dir->inode.size)
 499                     >> dirblk_log2);
 500              blk++)
 501           {
 502             /* The header is skipped, the first direntry is stored
 503                from byte 16.  */
 504             int pos = 16;
 505             int entries;
 506             int tail_start = (dirblk_size
 507                               - sizeof (struct grub_xfs_dirblock_tail));
 508
 509             struct grub_xfs_dirblock_tail *tail;
 510             tail = (struct grub_xfs_dirblock_tail *) &dirblock[tail_start];
 511
 512             numread = grub_xfs_read_file (dir, 0,
 513                                           blk << dirblk_log2,
 514                                           dirblk_size, dirblock);
 515             if (numread != dirblk_size)
 516               return 0;
 517
 518             entries = (grub_be_to_cpu32 (tail->leaf_count)
 519                        - grub_be_to_cpu32 (tail->leaf_stale));
 520
 521             /* Iterate over all entries within this block.  */
 522             while (pos < (dirblk_size
 523                           - (int) sizeof (struct grub_xfs_dir2_entry)))
 524               {
 525                 struct grub_xfs_dir2_entry *direntry;
 526                 grub_uint16_t *freetag;
 527                 char *filename;
 528
 529                 direntry = (struct grub_xfs_dir2_entry *) &dirblock[pos];
 530                 freetag = (grub_uint16_t *) direntry;
 531
 532                 if (*freetag == 0XFFFF)
 533                   {
 534                     grub_uint16_t *skip = (grub_uint16_t *) (freetag + 1);
 535
 536                     /* This entry is not used, go to the next one.  */
 537                     pos += grub_be_to_cpu16 (*skip);
 538
 539                     continue;
 540                   }
 541
 542                 filename = &dirblock[pos + sizeof (*direntry)];
 543                 /* The byte after the filename is for the tag, which
 544                    is not used by GRUB.  So it can be overwritten.  */
 545                 filename[direntry->len] = '\0';
 546
 547                 if (call_hook (direntry->inode, filename))
 548                   {
 549                     grub_free (dirblock);
 550                     return 1;
 551                   }
 552
 553                 /* Check if last direntry in this block is
 554                    reached.  */
 555                 entries--;
 556                 if (!entries)
 557                   break;
 558
 559                 /* Select the next directory entry.  */
 560                 pos = GRUB_XFS_NEXT_DIRENT (pos, direntry->len);
 561                 pos = GRUB_XFS_ROUND_TO_DIRENT (pos);
 562               }
 563           }
 564         grub_free (dirblock);
 565         break;
 566       }
 567
 568     default:
 569       grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET,
 570                   "xfs does not support inode format %d yet",
 571                   diro->inode.format);
 572     }
 573   return 0;
 574 }
 575
 576
 577 static struct grub_xfs_data *
 578 grub_xfs_mount (grub_disk_t disk)
 579 {
 580   struct grub_xfs_data *data = 0;
 581
 582   data = grub_zalloc (sizeof (struct grub_xfs_data));
 583   if (!data)
 584     return 0;
 585
 586   /* Read the superblock.  */
 587   if (grub_disk_read (disk, 0, 0,
 588                       sizeof (struct grub_xfs_sblock), &data->sblock))
 589     goto fail;
 590
 591   if (grub_strncmp ((char *) (data->sblock.magic), "XFSB", 4))
 592     {
 593       grub_error (GRUB_ERR_BAD_FS, "not a xfs filesystem");
 594       goto fail;
 595     }
 596
 597   data = grub_realloc (data,
 598                        sizeof (struct grub_xfs_data)
 599                        - sizeof (struct grub_xfs_inode)
 600                        + (1 << data->sblock.log2_inode));
 601
 602   if (! data)
 603     goto fail;
 604
 605   data->diropen.data = data;
 606   data->diropen.ino = data->sblock.rootino;
 607   data->diropen.inode_read = 1;
 608   data->bsize = grub_be_to_cpu32 (data->sblock.bsize);
 609   data->agsize = grub_be_to_cpu32 (data->sblock.agsize);
 610
 611   data->disk = disk;
 612   data->pos = 0;
 613
 614   grub_xfs_read_inode (data, data->diropen.ino, &data->diropen.inode);
 615
 616   return data;
 617  fail:
 618
 619   if (grub_errno == GRUB_ERR_OUT_OF_RANGE)
 620     grub_error (GRUB_ERR_BAD_FS, "not an xfs filesystem");
 621
 622   grub_free (data);
 623
 624   return 0;
 625 }
 626
 627 \f
 628 static grub_err_t
 629 grub_xfs_dir (grub_device_t device, const char *path,
 630               int (*hook) (const char *filename,
 631                            const struct grub_dirhook_info *info))
 632 {
 633   struct grub_xfs_data *data = 0;
 634   struct grub_fshelp_node *fdiro = 0;
 635
 636   auto int NESTED_FUNC_ATTR iterate (const char *filename,
 637                                      enum grub_fshelp_filetype filetype,
 638                                      grub_fshelp_node_t node);
 639
 640   int NESTED_FUNC_ATTR iterate (const char *filename,
 641                                 enum grub_fshelp_filetype filetype,
 642                                 grub_fshelp_node_t node)
 643     {
 644       struct grub_dirhook_info info;
 645       grub_memset (&info, 0, sizeof (info));
 646       info.dir = ((filetype & GRUB_FSHELP_TYPE_MASK) == GRUB_FSHELP_DIR);
 647       grub_free (node);
 648       return hook (filename, &info);
 649     }
 650
 651   grub_dl_ref (my_mod);
 652
 653   data = grub_xfs_mount (device->disk);
 654   if (!data)
 655     goto mount_fail;
 656
 657   grub_fshelp_find_file (path, &data->diropen, &fdiro, grub_xfs_iterate_dir,
 658                          grub_xfs_read_symlink, GRUB_FSHELP_DIR);
 659   if (grub_errno)
 660     goto fail;
 661
 662   grub_xfs_iterate_dir (fdiro, iterate);
 663
 664  fail:
 665   if (fdiro != &data->diropen)
 666     grub_free (fdiro);
 667   grub_free (data);
 668
 669  mount_fail:
 670
 671   grub_dl_unref (my_mod);
 672
 673   return grub_errno;
 674 }
 675
 676
 677 /* Open a file named NAME and initialize FILE.  */
 678 static grub_err_t
 679 grub_xfs_open (struct grub_file *file, const char *name)
 680 {
 681   struct grub_xfs_data *data;
 682   struct grub_fshelp_node *fdiro = 0;
 683
 684   grub_dl_ref (my_mod);
 685
 686   data = grub_xfs_mount (file->device->disk);
 687   if (!data)
 688     goto mount_fail;
 689
 690   grub_fshelp_find_file (name, &data->diropen, &fdiro, grub_xfs_iterate_dir,
 691                          grub_xfs_read_symlink, GRUB_FSHELP_REG);
 692   if (grub_errno)
 693     goto fail;
 694
 695   if (!fdiro->inode_read)
 696     {
 697       grub_xfs_read_inode (data, fdiro->ino, &fdiro->inode);
 698       if (grub_errno)
 699         goto fail;
 700     }
 701
 702   if (fdiro != &data->diropen)
 703     grub_memcpy (&data->diropen, fdiro,
 704                  sizeof (struct grub_fshelp_node)
 705                  - sizeof (struct grub_xfs_inode)
 706                  + (1 << data->sblock.log2_inode));
 707
 708   file->size = grub_be_to_cpu64 (data->diropen.inode.size);
 709   file->data = data;
 710   file->offset = 0;
 711
 712   return 0;
 713
 714  fail:
 715   if (fdiro != &data->diropen)
 716     grub_free (fdiro);
 717   grub_free (data);
 718
 719  mount_fail:
 720   grub_dl_unref (my_mod);
 721
 722   return grub_errno;
 723 }
 724
 725
 726 static grub_ssize_t
 727 grub_xfs_read (grub_file_t file, char *buf, grub_size_t len)
 728 {
 729   struct grub_xfs_data *data =
 730     (struct grub_xfs_data *) file->data;
 731
 732   return grub_xfs_read_file (&data->diropen, file->read_hook,
 733                               file->offset, len, buf);
 734 }
 735
 736
 737 static grub_err_t
 738 grub_xfs_close (grub_file_t file)
 739 {
 740   grub_free (file->data);
 741
 742   grub_dl_unref (my_mod);
 743
 744   return GRUB_ERR_NONE;
 745 }
 746
 747
 748 static grub_err_t
 749 grub_xfs_label (grub_device_t device, char **label)
 750 {
 751   struct grub_xfs_data *data;
 752   grub_disk_t disk = device->disk;
 753
 754   grub_dl_ref (my_mod);
 755
 756   data = grub_xfs_mount (disk);
 757   if (data)
 758     *label = grub_strndup ((char *) (data->sblock.label), 12);
 759   else
 760     *label = 0;
 761
 762   grub_dl_unref (my_mod);
 763
 764   grub_free (data);
 765
 766   return grub_errno;
 767 }
 768
 769 static grub_err_t
 770 grub_xfs_uuid (grub_device_t device, char **uuid)
 771 {
 772   struct grub_xfs_data *data;
 773   grub_disk_t disk = device->disk;
 774
 775   grub_dl_ref (my_mod);
 776
 777   data = grub_xfs_mount (disk);
 778   if (data)
 779     {
 780       *uuid = grub_malloc (sizeof ("xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"));
 781       grub_sprintf (*uuid, "%04x%04x-%04x-%04x-%04x-%04x%04x%04x",
 782                     grub_be_to_cpu16 (data->sblock.uuid[0]), grub_be_to_cpu16 (data->sblock.uuid[1]),
 783                     grub_be_to_cpu16 (data->sblock.uuid[2]), grub_be_to_cpu16 (data->sblock.uuid[3]),
 784                     grub_be_to_cpu16 (data->sblock.uuid[4]), grub_be_to_cpu16 (data->sblock.uuid[5]),
 785                     grub_be_to_cpu16 (data->sblock.uuid[6]), grub_be_to_cpu16 (data->sblock.uuid[7]));
 786     }
 787   else
 788     *uuid = NULL;
 789
 790   grub_dl_unref (my_mod);
 791
 792   grub_free (data);
 793
 794   return grub_errno;
 795 }
 796
 797 \f
 798
 799 static struct grub_fs grub_xfs_fs =
 800   {
 801     .name = "xfs",
 802     .dir = grub_xfs_dir,
 803     .open = grub_xfs_open,
 804     .read = grub_xfs_read,
 805     .close = grub_xfs_close,
 806     .label = grub_xfs_label,
 807     .uuid = grub_xfs_uuid,
 808     .next = 0
 809   };
 810
 811 GRUB_MOD_INIT(xfs)
 812 {
 813   grub_fs_register (&grub_xfs_fs);
 814   my_mod = mod;
 815 }
 816
 817 GRUB_MOD_FINI(xfs)
 818 {
 819   grub_fs_unregister (&grub_xfs_fs);
 820 }