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 static grub_dl_t my_mod;
 152
 153 \f
 154
 155 /* Filetype information as used in inodes.  */
 156 #define FILETYPE_INO_MASK       0170000
 157 #define FILETYPE_INO_REG        0100000
 158 #define FILETYPE_INO_DIRECTORY  0040000
 159 #define FILETYPE_INO_SYMLINK    0120000
 160
 161 #define GRUB_XFS_INO_AGBITS(data)               \
 162   ((data)->sblock.log2_agblk + (data)->sblock.log2_inop)
 163 #define GRUB_XFS_INO_INOINAG(data, ino)         \
 164   (grub_be_to_cpu64 (ino) & ((1 << GRUB_XFS_INO_AGBITS (data)) - 1))
 165 #define GRUB_XFS_INO_AG(data,ino)               \
 166   (grub_be_to_cpu64 (ino) >> GRUB_XFS_INO_AGBITS (data))
 167
 168 #define GRUB_XFS_FSB_TO_BLOCK(data, fsb) \
 169   (((fsb) >> (data)->sblock.log2_agblk) * (data)->agsize \
 170  + ((fsb) & ((1 << (data)->sblock.log2_agblk) - 1)))
 171
 172 #define GRUB_XFS_EXTENT_OFFSET(exts,ex) \
 173         ((grub_be_to_cpu32 (exts[ex][0]) & ~(1 << 31)) << 23 \
 174         | grub_be_to_cpu32 (exts[ex][1]) >> 9)
 175
 176 #define GRUB_XFS_EXTENT_BLOCK(exts,ex)          \
 177   ((grub_uint64_t) (grub_be_to_cpu32 (exts[ex][1]) \
 178                   & (0x1ff)) << 43 \
 179    | (grub_uint64_t) grub_be_to_cpu32 (exts[ex][2]) << 11 \
 180    | grub_be_to_cpu32 (exts[ex][3]) >> 21)
 181
 182 #define GRUB_XFS_EXTENT_SIZE(exts,ex)           \
 183   (grub_be_to_cpu32 (exts[ex][3]) & ((1 << 20) - 1))
 184
 185 #define GRUB_XFS_ROUND_TO_DIRENT(pos)   ((((pos) + 8 - 1) / 8) * 8)
 186 #define GRUB_XFS_NEXT_DIRENT(pos,len)           \
 187   (pos) + GRUB_XFS_ROUND_TO_DIRENT (8 + 1 + len + 2)
 188 \f
 189 static inline int
 190 grub_xfs_inode_block (struct grub_xfs_data *data,
 191                       grub_uint64_t ino)
 192 {
 193   long long int inoinag = GRUB_XFS_INO_INOINAG (data, ino);
 194   long long ag = GRUB_XFS_INO_AG (data, ino);
 195   long long block;
 196
 197   block = (inoinag >> 4) + ag * data->agsize;
 198   block <<= (data->sblock.log2_bsize - GRUB_DISK_SECTOR_BITS);
 199   return block;
 200 }
 201
 202
 203 static inline int
 204 grub_xfs_inode_offset (struct grub_xfs_data *data,
 205                        grub_uint64_t ino)
 206 {
 207   int inoag = GRUB_XFS_INO_INOINAG (data, ino);
 208   return (inoag & ((1 << 4) - 1)) << 8;
 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   int 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                       sizeof (struct grub_xfs_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 + XFS_INODE_EXTENTS])
 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       if (!fdiro)
 405         return 0;
 406
 407       /* The inode should be read, otherwise the filetype can
 408          not be determined.  */
 409       fdiro->ino = ino;
 410       fdiro->inode_read = 1;
 411       fdiro->data = diro->data;
 412       grub_xfs_read_inode (diro->data, ino, &fdiro->inode);
 413
 414       return hook (filename,
 415                    grub_xfs_mode_to_filetype (fdiro->inode.mode),
 416                    fdiro);
 417     }
 418
 419   switch (diro->inode.format)
 420     {
 421     case XFS_INODE_FORMAT_INO:
 422       {
 423         struct grub_xfs_dir_entry *de = &diro->inode.data.dir.direntry[0];
 424         int smallino = !diro->inode.data.dir.dirhead.smallino;
 425         int i;
 426         grub_uint64_t parent;
 427
 428         /* If small inode numbers are used to pack the direntry, the
 429            parent inode number is small too.  */
 430         if (smallino)
 431           {
 432             parent = grub_be_to_cpu32 (diro->inode.data.dir.dirhead.parent.i4);
 433             parent = grub_cpu_to_be64 (parent);
 434             /* The header is a bit smaller than usual.  */
 435             de = (struct grub_xfs_dir_entry *) ((char *) de - 4);
 436           }
 437         else
 438           {
 439             parent = diro->inode.data.dir.dirhead.parent.i8;
 440           }
 441
 442         /* Synthesize the direntries for `.' and `..'.  */
 443         if (call_hook (diro->ino, "."))
 444           return 1;
 445
 446         if (call_hook (parent, ".."))
 447           return 1;
 448
 449         for (i = 0; i < diro->inode.data.dir.dirhead.count; i++)
 450           {
 451             grub_uint64_t ino;
 452             void *inopos = (((char *) de)
 453                             + sizeof (struct grub_xfs_dir_entry)
 454                             + de->len - 1);
 455             char name[de->len + 1];
 456
 457             if (smallino)
 458               {
 459                 ino = grub_be_to_cpu32 (*(grub_uint32_t *) inopos);
 460                 ino = grub_cpu_to_be64 (ino);
 461               }
 462             else
 463               ino = *(grub_uint64_t *) inopos;
 464
 465             grub_memcpy (name, de->name, de->len);
 466             name[de->len] = '\0';
 467             if (call_hook (ino, name))
 468               return 1;
 469
 470             de = ((struct grub_xfs_dir_entry *)
 471                   (((char *) de)+ sizeof (struct grub_xfs_dir_entry) + de->len
 472                    + ((smallino ? sizeof (grub_uint32_t)
 473                        : sizeof (grub_uint64_t))) - 1));
 474           }
 475         break;
 476       }
 477
 478     case XFS_INODE_FORMAT_BTREE:
 479     case XFS_INODE_FORMAT_EXT:
 480       {
 481         grub_ssize_t numread;
 482         char *dirblock;
 483         grub_uint64_t blk;
 484         int dirblk_size, dirblk_log2;
 485
 486         dirblk_log2 = (dir->data->sblock.log2_bsize
 487                        + dir->data->sblock.log2_dirblk);
 488         dirblk_size = 1 << dirblk_log2;
 489
 490         dirblock = grub_malloc (dirblk_size);
 491         if (! dirblock)
 492           return 0;
 493
 494         /* Iterate over every block the directory has.  */
 495         for (blk = 0;
 496              blk < (grub_be_to_cpu64 (dir->inode.size)
 497                     >> dirblk_log2);
 498              blk++)
 499           {
 500             /* The header is skipped, the first direntry is stored
 501                from byte 16.  */
 502             int pos = 16;
 503             int entries;
 504             int tail_start = (dirblk_size
 505                               - sizeof (struct grub_xfs_dirblock_tail));
 506
 507             struct grub_xfs_dirblock_tail *tail;
 508             tail = (struct grub_xfs_dirblock_tail *) &dirblock[tail_start];
 509
 510             numread = grub_xfs_read_file (dir, 0,
 511                                           blk << dirblk_log2,
 512                                           dirblk_size, dirblock);
 513             if (numread != dirblk_size)
 514               return 0;
 515
 516             entries = (grub_be_to_cpu32 (tail->leaf_count)
 517                        - grub_be_to_cpu32 (tail->leaf_stale));
 518
 519             /* Iterate over all entries within this block.  */
 520             while (pos < (dirblk_size
 521                           - (int) sizeof (struct grub_xfs_dir2_entry)))
 522               {
 523                 struct grub_xfs_dir2_entry *direntry;
 524                 grub_uint16_t *freetag;
 525                 char *filename;
 526
 527                 direntry = (struct grub_xfs_dir2_entry *) &dirblock[pos];
 528                 freetag = (grub_uint16_t *) direntry;
 529
 530                 if (*freetag == 0XFFFF)
 531                   {
 532                     grub_uint16_t *skip = (grub_uint16_t *) (freetag + 1);
 533
 534                     /* This entry is not used, go to the next one.  */
 535                     pos += grub_be_to_cpu16 (*skip);
 536
 537                     continue;
 538                   }
 539
 540                 filename = &dirblock[pos + sizeof (*direntry)];
 541                 /* The byte after the filename is for the tag, which
 542                    is not used by GRUB.  So it can be overwritten.  */
 543                 filename[direntry->len] = '\0';
 544
 545                 if (call_hook (direntry->inode, filename))
 546                   {
 547                     grub_free (dirblock);
 548                     return 1;
 549                   }
 550
 551                 /* Check if last direntry in this block is
 552                    reached.  */
 553                 entries--;
 554                 if (!entries)
 555                   break;
 556
 557                 /* Select the next directory entry.  */
 558                 pos = GRUB_XFS_NEXT_DIRENT (pos, direntry->len);
 559                 pos = GRUB_XFS_ROUND_TO_DIRENT (pos);
 560               }
 561           }
 562         grub_free (dirblock);
 563         break;
 564       }
 565
 566     default:
 567       grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET,
 568                   "xfs does not support inode format %d yet",
 569                   diro->inode.format);
 570     }
 571   return 0;
 572 }
 573
 574
 575 static struct grub_xfs_data *
 576 grub_xfs_mount (grub_disk_t disk)
 577 {
 578   struct grub_xfs_data *data = 0;
 579
 580   data = grub_malloc (sizeof (struct grub_xfs_data));
 581   if (!data)
 582     return 0;
 583
 584   /* Read the superblock.  */
 585   if (grub_disk_read (disk, 0, 0,
 586                       sizeof (struct grub_xfs_sblock), &data->sblock))
 587     goto fail;
 588
 589   if (grub_strncmp ((char *) (data->sblock.magic), "XFSB", 4))
 590     {
 591       grub_error (GRUB_ERR_BAD_FS, "not a xfs filesystem");
 592       goto fail;
 593     }
 594
 595   data->diropen.data = data;
 596   data->diropen.ino = data->sblock.rootino;
 597   data->diropen.inode_read = 1;
 598   data->bsize = grub_be_to_cpu32 (data->sblock.bsize);
 599   data->agsize = grub_be_to_cpu32 (data->sblock.agsize);
 600
 601   data->disk = disk;
 602   data->inode = &data->diropen.inode;
 603   data->pos = 0;
 604
 605   grub_xfs_read_inode (data, data->diropen.ino, data->inode);
 606
 607   return data;
 608  fail:
 609
 610   if (grub_errno == GRUB_ERR_OUT_OF_RANGE)
 611     grub_error (GRUB_ERR_BAD_FS, "not an xfs filesystem");
 612
 613   grub_free (data);
 614
 615   return 0;
 616 }
 617
 618 \f
 619 static grub_err_t
 620 grub_xfs_dir (grub_device_t device, const char *path,
 621               int (*hook) (const char *filename,
 622                            const struct grub_dirhook_info *info))
 623 {
 624   struct grub_xfs_data *data = 0;;
 625   struct grub_fshelp_node *fdiro = 0;
 626
 627   auto int NESTED_FUNC_ATTR iterate (const char *filename,
 628                                      enum grub_fshelp_filetype filetype,
 629                                      grub_fshelp_node_t node);
 630
 631   int NESTED_FUNC_ATTR iterate (const char *filename,
 632                                 enum grub_fshelp_filetype filetype,
 633                                 grub_fshelp_node_t node)
 634     {
 635       struct grub_dirhook_info info;
 636       grub_memset (&info, 0, sizeof (info));
 637       info.dir = ((filetype & GRUB_FSHELP_TYPE_MASK) == GRUB_FSHELP_DIR);
 638       grub_free (node);
 639       return hook (filename, &info);
 640     }
 641
 642   grub_dl_ref (my_mod);
 643
 644   data = grub_xfs_mount (device->disk);
 645   if (!data)
 646     goto fail;
 647
 648   grub_fshelp_find_file (path, &data->diropen, &fdiro, grub_xfs_iterate_dir,
 649                          grub_xfs_read_symlink, GRUB_FSHELP_DIR);
 650   if (grub_errno)
 651     goto fail;
 652
 653   grub_xfs_iterate_dir (fdiro, iterate);
 654
 655  fail:
 656   if (fdiro != &data->diropen)
 657     grub_free (fdiro);
 658   grub_free (data);
 659
 660   grub_dl_unref (my_mod);
 661
 662   return grub_errno;
 663
 664   return 0;
 665 }
 666
 667
 668 /* Open a file named NAME and initialize FILE.  */
 669 static grub_err_t
 670 grub_xfs_open (struct grub_file *file, const char *name)
 671 {
 672   struct grub_xfs_data *data;
 673   struct grub_fshelp_node *fdiro = 0;
 674
 675   grub_dl_ref (my_mod);
 676
 677   data = grub_xfs_mount (file->device->disk);
 678   if (!data)
 679     goto fail;
 680
 681   grub_fshelp_find_file (name, &data->diropen, &fdiro, grub_xfs_iterate_dir,
 682                          grub_xfs_read_symlink, GRUB_FSHELP_REG);
 683   if (grub_errno)
 684     goto fail;
 685
 686   if (!fdiro->inode_read)
 687     {
 688       grub_xfs_read_inode (data, fdiro->ino, &fdiro->inode);
 689       if (grub_errno)
 690         goto fail;
 691     }
 692
 693   grub_memcpy (data->inode,
 694                &fdiro->inode,
 695                sizeof (struct grub_xfs_inode));
 696   grub_free (fdiro);
 697
 698   file->size = grub_be_to_cpu64 (data->inode->size);
 699   file->data = data;
 700   file->offset = 0;
 701
 702   return 0;
 703
 704  fail:
 705   if (fdiro != &data->diropen)
 706     grub_free (fdiro);
 707   grub_free (data);
 708
 709   grub_dl_unref (my_mod);
 710
 711   return grub_errno;
 712 }
 713
 714
 715 static grub_ssize_t
 716 grub_xfs_read (grub_file_t file, char *buf, grub_size_t len)
 717 {
 718   struct grub_xfs_data *data =
 719     (struct grub_xfs_data *) file->data;
 720
 721   return grub_xfs_read_file (&data->diropen, file->read_hook,
 722                               file->offset, len, buf);
 723 }
 724
 725
 726 static grub_err_t
 727 grub_xfs_close (grub_file_t file)
 728 {
 729   grub_free (file->data);
 730
 731   grub_dl_unref (my_mod);
 732
 733   return GRUB_ERR_NONE;
 734 }
 735
 736
 737 static grub_err_t
 738 grub_xfs_label (grub_device_t device, char **label)
 739 {
 740   struct grub_xfs_data *data;
 741   grub_disk_t disk = device->disk;
 742
 743   grub_dl_ref (my_mod);
 744
 745   data = grub_xfs_mount (disk);
 746   if (data)
 747     *label = grub_strndup ((char *) (data->sblock.label), 12);
 748   else
 749     *label = 0;
 750
 751   grub_dl_unref (my_mod);
 752
 753   grub_free (data);
 754
 755   return grub_errno;
 756 }
 757
 758 static grub_err_t
 759 grub_xfs_uuid (grub_device_t device, char **uuid)
 760 {
 761   struct grub_xfs_data *data;
 762   grub_disk_t disk = device->disk;
 763
 764   grub_dl_ref (my_mod);
 765
 766   data = grub_xfs_mount (disk);
 767   if (data)
 768     {
 769       *uuid = grub_malloc (sizeof ("xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"));
 770       grub_sprintf (*uuid, "%04x%04x-%04x-%04x-%04x-%04x%04x%04x",
 771                     grub_be_to_cpu16 (data->sblock.uuid[0]), grub_be_to_cpu16 (data->sblock.uuid[1]),
 772                     grub_be_to_cpu16 (data->sblock.uuid[2]), grub_be_to_cpu16 (data->sblock.uuid[3]),
 773                     grub_be_to_cpu16 (data->sblock.uuid[4]), grub_be_to_cpu16 (data->sblock.uuid[5]),
 774                     grub_be_to_cpu16 (data->sblock.uuid[6]), grub_be_to_cpu16 (data->sblock.uuid[7]));
 775     }
 776   else
 777     *uuid = NULL;
 778
 779   grub_dl_unref (my_mod);
 780
 781   grub_free (data);
 782
 783   return grub_errno;
 784 }
 785
 786 \f
 787
 788 static struct grub_fs grub_xfs_fs =
 789   {
 790     .name = "xfs",
 791     .dir = grub_xfs_dir,
 792     .open = grub_xfs_open,
 793     .read = grub_xfs_read,
 794     .close = grub_xfs_close,
 795     .label = grub_xfs_label,
 796     .uuid = grub_xfs_uuid,
 797     .next = 0
 798   };
 799
 800 GRUB_MOD_INIT(xfs)
 801 {
 802   grub_fs_register (&grub_xfs_fs);
 803   my_mod = mod;
 804 }
 805
 806 GRUB_MOD_FINI(xfs)
 807 {
 808   grub_fs_unregister (&grub_xfs_fs);
 809 }