arch/common/boot/grub2/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 unused5[2];
  50   grub_uint8_t log2_inop;
  51   grub_uint8_t log2_agblk;
  52   grub_uint8_t unused6[67];
  53   grub_uint8_t log2_dirblk;
  54 } __attribute__ ((packed));
  55
  56 struct grub_xfs_dir_header
  57 {
  58   grub_uint8_t count;
  59   grub_uint8_t smallino;
  60   union
  61   {
  62     grub_uint32_t i4;
  63     grub_uint64_t i8;
  64   } parent __attribute__ ((packed));
  65 } __attribute__ ((packed));
  66
  67 struct grub_xfs_dir_entry
  68 {
  69   grub_uint8_t len;
  70   grub_uint16_t offset;
  71   char name[1];
  72   /* Inode number follows, 32 bits.  */
  73 } __attribute__ ((packed));
  74
  75 struct grub_xfs_dir2_entry
  76 {
  77   grub_uint64_t inode;
  78   grub_uint8_t len;
  79 } __attribute__ ((packed));
  80
  81 typedef grub_uint32_t grub_xfs_extent[4];
  82
  83 struct grub_xfs_btree_node
  84 {
  85   grub_uint8_t magic[4];
  86   grub_uint16_t level;
  87   grub_uint16_t numrecs;
  88   grub_uint64_t left;
  89   grub_uint64_t right;
  90   grub_uint64_t keys[1];
  91 }  __attribute__ ((packed));
  92
  93 struct grub_xfs_btree_root
  94 {
  95   grub_uint16_t level;
  96   grub_uint16_t numrecs;
  97   grub_uint64_t keys[1];
  98 }  __attribute__ ((packed));
  99
 100 struct grub_xfs_inode
 101 {
 102   grub_uint8_t magic[2];
 103   grub_uint16_t mode;
 104   grub_uint8_t version;
 105   grub_uint8_t format;
 106   grub_uint8_t unused2[50];
 107   grub_uint64_t size;
 108   grub_uint64_t nblocks;
 109   grub_uint32_t extsize;
 110   grub_uint32_t nextents;
 111   grub_uint8_t unused3[20];
 112   union
 113   {
 114     char raw[156];
 115     struct dir
 116     {
 117       struct grub_xfs_dir_header dirhead;
 118       struct grub_xfs_dir_entry direntry[1];
 119     } dir;
 120     grub_xfs_extent extents[XFS_INODE_EXTENTS];
 121     struct grub_xfs_btree_root btree;
 122   } data __attribute__ ((packed));
 123 } __attribute__ ((packed));
 124
 125 struct grub_xfs_dirblock_tail
 126 {
 127   grub_uint32_t leaf_count;
 128   grub_uint32_t leaf_stale;
 129 } __attribute__ ((packed));
 130
 131 struct grub_fshelp_node
 132 {
 133   struct grub_xfs_data *data;
 134   struct grub_xfs_inode inode;
 135   grub_uint64_t ino;
 136   int inode_read;
 137 };
 138
 139 struct grub_xfs_data
 140 {
 141   struct grub_xfs_sblock sblock;
 142   struct grub_xfs_inode *inode;
 143   grub_disk_t disk;
 144   int pos;
 145   int bsize;
 146   int agsize;
 147   struct grub_fshelp_node diropen;
 148
 149 };
 150
 151 #ifndef GRUB_UTIL
 152 static grub_dl_t my_mod;
 153 #endif
 154
 155 \f
 156
 157 /* Filetype information as used in inodes.  */
 158 #define FILETYPE_INO_MASK       0170000
 159 #define FILETYPE_INO_REG        0100000
 160 #define FILETYPE_INO_DIRECTORY  0040000
 161 #define FILETYPE_INO_SYMLINK    0120000
 162
 163 #define GRUB_XFS_INO_AGBITS(data)               \
 164   ((data)->sblock.log2_agblk + (data)->sblock.log2_inop)
 165 #define GRUB_XFS_INO_INOINAG(data, ino)         \
 166   (grub_be_to_cpu64 (ino) & ((1 << GRUB_XFS_INO_AGBITS (data)) - 1))
 167 #define GRUB_XFS_INO_AG(data,ino)               \
 168   (grub_be_to_cpu64 (ino) >> GRUB_XFS_INO_AGBITS (data))
 169
 170 #define GRUB_XFS_FSB_TO_BLOCK(data, fsb) \
 171   (((fsb) >> (data)->sblock.log2_agblk) * (data)->agsize \
 172  + ((fsb) & ((1 << (data)->sblock.log2_agblk) - 1)))
 173
 174 #define GRUB_XFS_EXTENT_OFFSET(exts,ex) \
 175         ((grub_be_to_cpu32 (exts[ex][0]) & ~(1 << 31)) << 23 \
 176         | grub_be_to_cpu32 (exts[ex][1]) >> 9)
 177
 178 #define GRUB_XFS_EXTENT_BLOCK(exts,ex)          \
 179   ((grub_uint64_t) (grub_be_to_cpu32 (exts[ex][1]) \
 180                   & (0x1ff)) << 43 \
 181    | (grub_uint64_t) grub_be_to_cpu32 (exts[ex][2]) << 11 \
 182    | grub_be_to_cpu32 (exts[ex][3]) >> 21)
 183
 184 #define GRUB_XFS_EXTENT_SIZE(exts,ex)           \
 185   (grub_be_to_cpu32 (exts[ex][3]) & ((1 << 20) - 1))
 186
 187 #define GRUB_XFS_ROUND_TO_DIRENT(pos)   ((((pos) + 8 - 1) / 8) * 8)
 188 #define GRUB_XFS_NEXT_DIRENT(pos,len)           \
 189   (pos) + GRUB_XFS_ROUND_TO_DIRENT (8 + 1 + len + 2)
 190 \f
 191 static inline int
 192 grub_xfs_inode_block (struct grub_xfs_data *data,
 193                       grub_uint64_t ino)
 194 {
 195   long long int inoinag = GRUB_XFS_INO_INOINAG (data, ino);
 196   long long ag = GRUB_XFS_INO_AG (data, ino);
 197   long long block;
 198
 199   block = (inoinag >> 4) + ag * data->agsize;
 200   block <<= (data->sblock.log2_bsize - GRUB_DISK_SECTOR_BITS);
 201   return block;
 202 }
 203
 204
 205 static inline int
 206 grub_xfs_inode_offset (struct grub_xfs_data *data,
 207                        grub_uint64_t ino)
 208 {
 209   int inoag = GRUB_XFS_INO_INOINAG (data, ino);
 210   return (inoag & ((1 << 4) - 1)) << 8;
 211 }
 212
 213
 214 static grub_err_t
 215 grub_xfs_read_inode (struct grub_xfs_data *data, grub_uint64_t ino,
 216                      struct grub_xfs_inode *inode)
 217 {
 218   int block = grub_xfs_inode_block (data, ino);
 219   int offset = grub_xfs_inode_offset (data, ino);
 220
 221   /* Read the inode.  */
 222   if (grub_disk_read (data->disk, block, offset,
 223                       sizeof (struct grub_xfs_inode), (char *) inode))
 224     return grub_errno;
 225
 226   if (grub_strncmp ((char *) inode->magic, "IN", 2))
 227     return grub_error (GRUB_ERR_BAD_FS, "not a correct XFS inode.\n");
 228
 229   return 0;
 230 }
 231
 232
 233 static grub_disk_addr_t
 234 grub_xfs_read_block (grub_fshelp_node_t node, grub_disk_addr_t fileblock)
 235 {
 236   struct grub_xfs_btree_node *leaf = 0;
 237   int ex, nrec;
 238   grub_xfs_extent *exts;
 239   grub_uint64_t ret = 0;
 240
 241   if (node->inode.format == XFS_INODE_FORMAT_BTREE)
 242     {
 243       grub_uint64_t *keys;
 244
 245       leaf = grub_malloc (node->data->sblock.bsize);
 246       if (leaf == 0)
 247         return 0;
 248
 249       nrec = grub_be_to_cpu16 (node->inode.data.btree.numrecs);
 250       keys = &node->inode.data.btree.keys[0];
 251       do
 252         {
 253           int i;
 254
 255           for (i = 0; i < nrec; i++)
 256             {
 257               if (fileblock < grub_be_to_cpu64 (keys[i]))
 258                 break;
 259             }
 260
 261           /* Sparse block.  */
 262           if (i == 0)
 263             {
 264               grub_free (leaf);
 265               return 0;
 266             }
 267
 268           if (grub_disk_read (node->data->disk,
 269                               grub_be_to_cpu64 (keys[i - 1 + XFS_INODE_EXTENTS])
 270                               << (node->data->sblock.log2_bsize
 271                                   - GRUB_DISK_SECTOR_BITS),
 272                               0, node->data->sblock.bsize, (char *) leaf))
 273             return 0;
 274
 275           if (grub_strncmp ((char *) leaf->magic, "BMAP", 4))
 276             {
 277               grub_free (leaf);
 278               grub_error (GRUB_ERR_BAD_FS, "not a correct XFS BMAP node.\n");
 279               return 0;
 280             }
 281
 282           nrec = grub_be_to_cpu16 (leaf->numrecs);
 283           keys = &leaf->keys[0];
 284         } while (leaf->level);
 285       exts = (grub_xfs_extent *) keys;
 286     }
 287   else if (node->inode.format == XFS_INODE_FORMAT_EXT)
 288     {
 289       nrec = grub_be_to_cpu32 (node->inode.nextents);
 290       exts = &node->inode.data.extents[0];
 291     }
 292   else
 293     {
 294       grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET,
 295                   "xfs does not support inode format %d yet",
 296                   node->inode.format);
 297       return 0;
 298     }
 299
 300   /* Iterate over each extent to figure out which extent has
 301      the block we are looking for.  */
 302   for (ex = 0; ex < nrec; ex++)
 303     {
 304       grub_uint64_t start = GRUB_XFS_EXTENT_BLOCK (exts, ex);
 305       grub_uint64_t offset = GRUB_XFS_EXTENT_OFFSET (exts, ex);
 306       grub_uint64_t size = GRUB_XFS_EXTENT_SIZE (exts, ex);
 307
 308       /* Sparse block.  */
 309       if (fileblock < offset)
 310         break;
 311       else if (fileblock < offset + size)
 312         {
 313           ret = (fileblock - offset + start);
 314           break;
 315         }
 316     }
 317
 318   if (leaf)
 319     grub_free (leaf);
 320
 321   return GRUB_XFS_FSB_TO_BLOCK(node->data, ret);
 322 }
 323
 324
 325 /* Read LEN bytes from the file described by DATA starting with byte
 326    POS.  Return the amount of read bytes in READ.  */
 327 static grub_ssize_t
 328 grub_xfs_read_file (grub_fshelp_node_t node,
 329                      void NESTED_FUNC_ATTR (*read_hook) (grub_disk_addr_t sector,
 330                                         unsigned offset, unsigned length),
 331                      int pos, grub_size_t len, char *buf)
 332 {
 333   return grub_fshelp_read_file (node->data->disk, node, read_hook,
 334                                 pos, len, buf, grub_xfs_read_block,
 335                                 grub_be_to_cpu64 (node->inode.size),
 336                                 node->data->sblock.log2_bsize
 337                                 - GRUB_DISK_SECTOR_BITS);
 338 }
 339
 340
 341 static char *
 342 grub_xfs_read_symlink (grub_fshelp_node_t node)
 343 {
 344   int size = grub_be_to_cpu64 (node->inode.size);
 345
 346   switch (node->inode.format)
 347     {
 348     case XFS_INODE_FORMAT_INO:
 349       return grub_strndup (node->inode.data.raw, size);
 350
 351     case XFS_INODE_FORMAT_EXT:
 352       {
 353         char *symlink;
 354         grub_ssize_t numread;
 355
 356         symlink = grub_malloc (size + 1);
 357         if (!symlink)
 358           return 0;
 359
 360         numread = grub_xfs_read_file (node, 0, 0, size, symlink);
 361         if (numread != size)
 362           {
 363             grub_free (symlink);
 364             return 0;
 365           }
 366         symlink[size] = '\0';
 367         return symlink;
 368       }
 369     }
 370
 371   return 0;
 372 }
 373
 374
 375 static enum grub_fshelp_filetype
 376 grub_xfs_mode_to_filetype (grub_uint16_t mode)
 377 {
 378   if ((grub_be_to_cpu16 (mode)
 379        & FILETYPE_INO_MASK) == FILETYPE_INO_DIRECTORY)
 380     return GRUB_FSHELP_DIR;
 381   else if ((grub_be_to_cpu16 (mode)
 382             & FILETYPE_INO_MASK) == FILETYPE_INO_SYMLINK)
 383     return GRUB_FSHELP_SYMLINK;
 384   else if ((grub_be_to_cpu16 (mode)
 385             & FILETYPE_INO_MASK) == FILETYPE_INO_REG)
 386     return GRUB_FSHELP_REG;
 387   return GRUB_FSHELP_UNKNOWN;
 388 }
 389
 390
 391 static int
 392 grub_xfs_iterate_dir (grub_fshelp_node_t dir,
 393                        int NESTED_FUNC_ATTR
 394                        (*hook) (const char *filename,
 395                                 enum grub_fshelp_filetype filetype,
 396                                 grub_fshelp_node_t node))
 397 {
 398   struct grub_fshelp_node *diro = (struct grub_fshelp_node *) dir;
 399   auto int NESTED_FUNC_ATTR call_hook (grub_uint64_t ino, char *filename);
 400
 401   int NESTED_FUNC_ATTR call_hook (grub_uint64_t ino, char *filename)
 402     {
 403       struct grub_fshelp_node *fdiro;
 404
 405       fdiro = grub_malloc (sizeof (struct grub_fshelp_node));
 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_malloc (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), (char *) &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->diropen.data = data;
 598   data->diropen.ino = data->sblock.rootino;
 599   data->diropen.inode_read = 1;
 600   data->bsize = grub_be_to_cpu32 (data->sblock.bsize);
 601   data->agsize = grub_be_to_cpu32 (data->sblock.agsize);
 602
 603   data->disk = disk;
 604   data->inode = &data->diropen.inode;
 605   data->pos = 0;
 606
 607   grub_xfs_read_inode (data, data->diropen.ino, data->inode);
 608
 609   return data;
 610  fail:
 611
 612   if (grub_errno == GRUB_ERR_OUT_OF_RANGE)
 613     grub_error (GRUB_ERR_BAD_FS, "not an xfs filesystem");
 614
 615   grub_free (data);
 616
 617   return 0;
 618 }
 619
 620 \f
 621 static grub_err_t
 622 grub_xfs_dir (grub_device_t device, const char *path,
 623               int (*hook) (const char *filename, int dir))
 624 {
 625   struct grub_xfs_data *data = 0;;
 626   struct grub_fshelp_node *fdiro = 0;
 627
 628   auto int NESTED_FUNC_ATTR iterate (const char *filename,
 629                                      enum grub_fshelp_filetype filetype,
 630                                      grub_fshelp_node_t node);
 631
 632   int NESTED_FUNC_ATTR iterate (const char *filename,
 633                                 enum grub_fshelp_filetype filetype,
 634                                 grub_fshelp_node_t node)
 635     {
 636       grub_free (node);
 637
 638       if (filetype == GRUB_FSHELP_DIR)
 639         return hook (filename, 1);
 640       else
 641         return hook (filename, 0);
 642
 643       return 0;
 644     }
 645
 646 #ifndef GRUB_UTIL
 647   grub_dl_ref (my_mod);
 648 #endif
 649
 650   data = grub_xfs_mount (device->disk);
 651   if (!data)
 652     goto fail;
 653
 654   grub_fshelp_find_file (path, &data->diropen, &fdiro, grub_xfs_iterate_dir,
 655                          grub_xfs_read_symlink, GRUB_FSHELP_DIR);
 656   if (grub_errno)
 657     goto fail;
 658
 659   grub_xfs_iterate_dir (fdiro, iterate);
 660
 661  fail:
 662   if (fdiro != &data->diropen)
 663     grub_free (fdiro);
 664   grub_free (data);
 665
 666 #ifndef GRUB_UTIL
 667   grub_dl_unref (my_mod);
 668 #endif
 669
 670   return grub_errno;
 671
 672   return 0;
 673 }
 674
 675
 676 /* Open a file named NAME and initialize FILE.  */
 677 static grub_err_t
 678 grub_xfs_open (struct grub_file *file, const char *name)
 679 {
 680   struct grub_xfs_data *data;
 681   struct grub_fshelp_node *fdiro = 0;
 682
 683 #ifndef GRUB_UTIL
 684   grub_dl_ref (my_mod);
 685 #endif
 686
 687   data = grub_xfs_mount (file->device->disk);
 688   if (!data)
 689     goto fail;
 690
 691   grub_fshelp_find_file (name, &data->diropen, &fdiro, grub_xfs_iterate_dir,
 692                          grub_xfs_read_symlink, GRUB_FSHELP_REG);
 693   if (grub_errno)
 694     goto fail;
 695
 696   if (!fdiro->inode_read)
 697     {
 698       grub_xfs_read_inode (data, fdiro->ino, &fdiro->inode);
 699       if (grub_errno)
 700         goto fail;
 701     }
 702
 703   grub_memcpy (data->inode,
 704                &fdiro->inode,
 705                sizeof (struct grub_xfs_inode));
 706   grub_free (fdiro);
 707
 708   file->size = grub_be_to_cpu64 (data->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 #ifndef GRUB_UTIL
 720   grub_dl_unref (my_mod);
 721 #endif
 722
 723   return grub_errno;
 724 }
 725
 726
 727 static grub_ssize_t
 728 grub_xfs_read (grub_file_t file, char *buf, grub_size_t len)
 729 {
 730   struct grub_xfs_data *data =
 731     (struct grub_xfs_data *) file->data;
 732
 733   return grub_xfs_read_file (&data->diropen, file->read_hook,
 734                               file->offset, len, buf);
 735 }
 736
 737
 738 static grub_err_t
 739 grub_xfs_close (grub_file_t file)
 740 {
 741   grub_free (file->data);
 742
 743 #ifndef GRUB_UTIL
 744   grub_dl_unref (my_mod);
 745 #endif
 746
 747   return GRUB_ERR_NONE;
 748 }
 749
 750
 751 static grub_err_t
 752 grub_xfs_label (grub_device_t device, char **label)
 753 {
 754   struct grub_xfs_data *data;
 755   grub_disk_t disk = device->disk;
 756
 757 #ifndef GRUB_UTIL
 758   grub_dl_ref (my_mod);
 759 #endif
 760
 761   data = grub_xfs_mount (disk);
 762   if (data)
 763     *label = grub_strndup ((char *) (data->sblock.label), 12);
 764   else
 765     *label = 0;
 766
 767 #ifndef GRUB_UTIL
 768   grub_dl_unref (my_mod);
 769 #endif
 770
 771   grub_free (data);
 772
 773   return grub_errno;
 774 }
 775
 776 static grub_err_t
 777 grub_xfs_uuid (grub_device_t device, char **uuid)
 778 {
 779   struct grub_xfs_data *data;
 780   grub_disk_t disk = device->disk;
 781
 782 #ifndef GRUB_UTIL
 783   grub_dl_ref (my_mod);
 784 #endif
 785
 786   data = grub_xfs_mount (disk);
 787   if (data)
 788     {
 789       *uuid = grub_malloc (sizeof ("xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"));
 790       grub_sprintf (*uuid, "%04x%04x-%04x-%04x-%04x-%04x%04x%04x",
 791                     grub_be_to_cpu16 (data->sblock.uuid[0]), grub_be_to_cpu16 (data->sblock.uuid[1]),
 792                     grub_be_to_cpu16 (data->sblock.uuid[2]), grub_be_to_cpu16 (data->sblock.uuid[3]),
 793                     grub_be_to_cpu16 (data->sblock.uuid[4]), grub_be_to_cpu16 (data->sblock.uuid[5]),
 794                     grub_be_to_cpu16 (data->sblock.uuid[6]), grub_be_to_cpu16 (data->sblock.uuid[7]));
 795     }
 796   else
 797     *uuid = NULL;
 798
 799 #ifndef GRUB_UTIL
 800   grub_dl_unref (my_mod);
 801 #endif
 802
 803   grub_free (data);
 804
 805   return grub_errno;
 806 }
 807
 808 \f
 809
 810 static struct grub_fs grub_xfs_fs =
 811   {
 812     .name = "xfs",
 813     .dir = grub_xfs_dir,
 814     .open = grub_xfs_open,
 815     .read = grub_xfs_read,
 816     .close = grub_xfs_close,
 817     .label = grub_xfs_label,
 818     .uuid = grub_xfs_uuid,
 819     .next = 0
 820   };
 821
 822 GRUB_MOD_INIT(xfs)
 823 {
 824   grub_fs_register (&grub_xfs_fs);
 825 #ifndef GRUB_UTIL
 826   my_mod = mod;
 827 #endif
 828 }
 829
 830 GRUB_MOD_FINI(xfs)
 831 {
 832   grub_fs_unregister (&grub_xfs_fs);
 833 }