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xfs.c

/* xfs.c - XFS.  */
/*
 *  GRUB  --  GRand Unified Bootloader
 *  Copyright (C) 2005,2006,2007,2008,2009  Free Software Foundation, Inc.
 *
 *  GRUB is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  GRUB is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <grub/err.h>
#include <grub/file.h>
#include <grub/mm.h>
#include <grub/misc.h>
#include <grub/disk.h>
#include <grub/dl.h>
#include <grub/types.h>
#include <grub/fshelp.h>

#define     XFS_INODE_EXTENTS 9

#define XFS_INODE_FORMAT_INO  1
#define XFS_INODE_FORMAT_EXT  2
#define XFS_INODE_FORMAT_BTREE      3


00036 struct grub_xfs_sblock
{
  grub_uint8_t magic[4];
  grub_uint32_t bsize;
  grub_uint8_t unused1[24];
  grub_uint16_t uuid[8];
  grub_uint8_t unused2[8];
  grub_uint64_t rootino;
  grub_uint8_t unused3[20];
  grub_uint32_t agsize;
  grub_uint8_t unused4[20];
  grub_uint8_t label[12];
  grub_uint8_t log2_bsize;
  grub_uint8_t log2_sect;
  grub_uint8_t log2_inode;
  grub_uint8_t log2_inop;
  grub_uint8_t log2_agblk;
  grub_uint8_t unused6[67];
  grub_uint8_t log2_dirblk;
} __attribute__ ((packed));

00057 struct grub_xfs_dir_header
{
  grub_uint8_t count;
  grub_uint8_t smallino;
  union
  {
    grub_uint32_t i4;
    grub_uint64_t i8;
  } parent __attribute__ ((packed));
} __attribute__ ((packed));

00068 struct grub_xfs_dir_entry
{
  grub_uint8_t len;
  grub_uint16_t offset;
  char name[1];
  /* Inode number follows, 32 bits.  */
} __attribute__ ((packed));

00076 struct grub_xfs_dir2_entry
{
  grub_uint64_t inode;
  grub_uint8_t len;
} __attribute__ ((packed));

typedef grub_uint32_t grub_xfs_extent[4];

00084 struct grub_xfs_btree_node
{
  grub_uint8_t magic[4];
  grub_uint16_t level;
  grub_uint16_t numrecs;
  grub_uint64_t left;
  grub_uint64_t right;
  grub_uint64_t keys[1];
}  __attribute__ ((packed));

00094 struct grub_xfs_btree_root
{
  grub_uint16_t level;
  grub_uint16_t numrecs;
  grub_uint64_t keys[1];
}  __attribute__ ((packed));

00101 struct grub_xfs_inode
{
  grub_uint8_t magic[2];
  grub_uint16_t mode;
  grub_uint8_t version;
  grub_uint8_t format;
  grub_uint8_t unused2[50];
  grub_uint64_t size;
  grub_uint64_t nblocks;
  grub_uint32_t extsize;
  grub_uint32_t nextents;
  grub_uint8_t unused3[20];
  union
  {
    char raw[156];
    struct dir
    {
      struct grub_xfs_dir_header dirhead;
      struct grub_xfs_dir_entry direntry[1];
    } dir;
    grub_xfs_extent extents[XFS_INODE_EXTENTS];
    struct grub_xfs_btree_root btree;
  } data __attribute__ ((packed));
} __attribute__ ((packed));
00125 
00126 struct grub_xfs_dirblock_tail
{
  grub_uint32_t leaf_count;
  grub_uint32_t leaf_stale;
} __attribute__ ((packed));

struct grub_fshelp_node
{
  struct grub_xfs_data *data;
  grub_uint64_t ino;
  int inode_read;
  struct grub_xfs_inode inode;
};

00140 struct grub_xfs_data
{
  struct grub_xfs_sblock sblock;
  grub_disk_t disk;
  int pos;
  int bsize;
  int agsize;
  struct grub_fshelp_node diropen;
};

static grub_dl_t my_mod;



/* Filetype information as used in inodes.  */
#define FILETYPE_INO_MASK     0170000
#define FILETYPE_INO_REG      0100000
#define FILETYPE_INO_DIRECTORY      0040000
#define FILETYPE_INO_SYMLINK  0120000

#define GRUB_XFS_INO_AGBITS(data)         \
  ((data)->sblock.log2_agblk + (data)->sblock.log2_inop)
#define GRUB_XFS_INO_INOINAG(data, ino)         \
  (grub_be_to_cpu64 (ino) & ((1LL << GRUB_XFS_INO_AGBITS (data)) - 1))
#define GRUB_XFS_INO_AG(data,ino)         \
  (grub_be_to_cpu64 (ino) >> GRUB_XFS_INO_AGBITS (data))

#define GRUB_XFS_FSB_TO_BLOCK(data, fsb) \
  (((fsb) >> (data)->sblock.log2_agblk) * (data)->agsize \
 + ((fsb) & ((1LL << (data)->sblock.log2_agblk) - 1)))

#define GRUB_XFS_EXTENT_OFFSET(exts,ex) \
      ((grub_be_to_cpu32 (exts[ex][0]) & ~(1 << 31)) << 23 \
      | grub_be_to_cpu32 (exts[ex][1]) >> 9)

#define GRUB_XFS_EXTENT_BLOCK(exts,ex)          \
  ((grub_uint64_t) (grub_be_to_cpu32 (exts[ex][1]) \
              & (0x1ff)) << 43 \
   | (grub_uint64_t) grub_be_to_cpu32 (exts[ex][2]) << 11 \
   | grub_be_to_cpu32 (exts[ex][3]) >> 21)

#define GRUB_XFS_EXTENT_SIZE(exts,ex)           \
  (grub_be_to_cpu32 (exts[ex][3]) & ((1 << 20) - 1))

#define GRUB_XFS_ROUND_TO_DIRENT(pos)     ((((pos) + 8 - 1) / 8) * 8)
#define GRUB_XFS_NEXT_DIRENT(pos,len)           \
  (pos) + GRUB_XFS_ROUND_TO_DIRENT (8 + 1 + len + 2)

static inline grub_uint64_t
grub_xfs_inode_block (struct grub_xfs_data *data,
                  grub_uint64_t ino)
{
  long long int inoinag = GRUB_XFS_INO_INOINAG (data, ino);
  long long ag = GRUB_XFS_INO_AG (data, ino);
  long long block;

  block = (inoinag >> data->sblock.log2_inop) + ag * data->agsize;
  block <<= (data->sblock.log2_bsize - GRUB_DISK_SECTOR_BITS);
  return block;
}


static inline int
grub_xfs_inode_offset (struct grub_xfs_data *data,
                   grub_uint64_t ino)
{
  int inoag = GRUB_XFS_INO_INOINAG (data, ino);
  return ((inoag & ((1 << data->sblock.log2_inop) - 1)) <<
        data->sblock.log2_inode);
}


static grub_err_t
grub_xfs_read_inode (struct grub_xfs_data *data, grub_uint64_t ino,
                 struct grub_xfs_inode *inode)
{
  grub_uint64_t block = grub_xfs_inode_block (data, ino);
  int offset = grub_xfs_inode_offset (data, ino);

  /* Read the inode.  */
  if (grub_disk_read (data->disk, block, offset,
                  1 << data->sblock.log2_inode, inode))
    return grub_errno;

  if (grub_strncmp ((char *) inode->magic, "IN", 2))
    return grub_error (GRUB_ERR_BAD_FS, "not a correct XFS inode");

  return 0;
}


static grub_disk_addr_t
grub_xfs_read_block (grub_fshelp_node_t node, grub_disk_addr_t fileblock)
{
  struct grub_xfs_btree_node *leaf = 0;
  int ex, nrec;
  grub_xfs_extent *exts;
  grub_uint64_t ret = 0;

  if (node->inode.format == XFS_INODE_FORMAT_BTREE)
    {
      grub_uint64_t *keys;

      leaf = grub_malloc (node->data->sblock.bsize);
      if (leaf == 0)
        return 0;

      nrec = grub_be_to_cpu16 (node->inode.data.btree.numrecs);
      keys = &node->inode.data.btree.keys[0];
      do
        {
          int i;

          for (i = 0; i < nrec; i++)
            {
              if (fileblock < grub_be_to_cpu64 (keys[i]))
                break;
            }

          /* Sparse block.  */
          if (i == 0)
            {
              grub_free (leaf);
              return 0;
            }

          if (grub_disk_read (node->data->disk,
                              grub_be_to_cpu64 (keys[i - 1 + nrec])
                              << (node->data->sblock.log2_bsize
                                  - GRUB_DISK_SECTOR_BITS),
                              0, node->data->sblock.bsize, leaf))
            return 0;

          if (grub_strncmp ((char *) leaf->magic, "BMAP", 4))
            {
              grub_free (leaf);
              grub_error (GRUB_ERR_BAD_FS, "not a correct XFS BMAP node");
              return 0;
            }

          nrec = grub_be_to_cpu16 (leaf->numrecs);
          keys = &leaf->keys[0];
        } while (leaf->level);
      exts = (grub_xfs_extent *) keys;
    }
  else if (node->inode.format == XFS_INODE_FORMAT_EXT)
    {
      nrec = grub_be_to_cpu32 (node->inode.nextents);
      exts = &node->inode.data.extents[0];
    }
  else
    {
      grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET,
              "XFS does not support inode format %d yet",
              node->inode.format);
      return 0;
    }

  /* Iterate over each extent to figure out which extent has
     the block we are looking for.  */
  for (ex = 0; ex < nrec; ex++)
    {
      grub_uint64_t start = GRUB_XFS_EXTENT_BLOCK (exts, ex);
      grub_uint64_t offset = GRUB_XFS_EXTENT_OFFSET (exts, ex);
      grub_uint64_t size = GRUB_XFS_EXTENT_SIZE (exts, ex);

      /* Sparse block.  */
      if (fileblock < offset)
        break;
      else if (fileblock < offset + size)
        {
          ret = (fileblock - offset + start);
          break;
        }
    }

  if (leaf)
    grub_free (leaf);

  return GRUB_XFS_FSB_TO_BLOCK(node->data, ret);
}


/* Read LEN bytes from the file described by DATA starting with byte
   POS.  Return the amount of read bytes in READ.  */
static grub_ssize_t
grub_xfs_read_file (grub_fshelp_node_t node,
                void (*read_hook) (grub_disk_addr_t sector,
                               unsigned offset, unsigned length,
                               void *closure),
                void *closure, int flags,
                int pos, grub_size_t len, char *buf)
{
  return grub_fshelp_read_file (node->data->disk, node, read_hook, closure,
                        flags, pos, len, buf, grub_xfs_read_block,
                        grub_be_to_cpu64 (node->inode.size),
                        node->data->sblock.log2_bsize
                        - GRUB_DISK_SECTOR_BITS);
}


static char *
grub_xfs_read_symlink (grub_fshelp_node_t node)
{
  int size = grub_be_to_cpu64 (node->inode.size);

  switch (node->inode.format)
    {
    case XFS_INODE_FORMAT_INO:
      return grub_strndup (node->inode.data.raw, size);

    case XFS_INODE_FORMAT_EXT:
      {
      char *symlink;
      grub_ssize_t numread;

      symlink = grub_malloc (size + 1);
      if (!symlink)
        return 0;

      numread = grub_xfs_read_file (node, 0, 0, 0, 0, size, symlink);
      if (numread != size)
        {
          grub_free (symlink);
          return 0;
        }
      symlink[size] = '\0';
      return symlink;
      }
    }

  return 0;
}


static enum grub_fshelp_filetype
grub_xfs_mode_to_filetype (grub_uint16_t mode)
{
  if ((grub_be_to_cpu16 (mode)
       & FILETYPE_INO_MASK) == FILETYPE_INO_DIRECTORY)
    return GRUB_FSHELP_DIR;
  else if ((grub_be_to_cpu16 (mode)
          & FILETYPE_INO_MASK) == FILETYPE_INO_SYMLINK)
    return GRUB_FSHELP_SYMLINK;
  else if ((grub_be_to_cpu16 (mode)
          & FILETYPE_INO_MASK) == FILETYPE_INO_REG)
    return GRUB_FSHELP_REG;
  return GRUB_FSHELP_UNKNOWN;
}

00390 struct grub_xfs_iterate_dir_closure
{
  int (*hook) (const char *filename,
             enum grub_fshelp_filetype filetype,
             grub_fshelp_node_t node,
             void *closure);
  void *closure;
  struct grub_fshelp_node *diro;
};

static int
call_hook (grub_uint64_t ino, char *filename,
         struct grub_xfs_iterate_dir_closure *c)
{
  struct grub_fshelp_node *fdiro;

  fdiro = grub_malloc (sizeof (struct grub_fshelp_node)
                   - sizeof (struct grub_xfs_inode)
                   + (1 << c->diro->data->sblock.log2_inode));
  if (!fdiro)
    return 0;

  /* The inode should be read, otherwise the filetype can
     not be determined.  */
  fdiro->ino = ino;
  fdiro->inode_read = 1;
  fdiro->data = c->diro->data;
  grub_xfs_read_inode (fdiro->data, ino, &fdiro->inode);

  return c->hook (filename,
              grub_xfs_mode_to_filetype (fdiro->inode.mode),
              fdiro, c->closure);
}

static int
grub_xfs_iterate_dir (grub_fshelp_node_t dir,
                   int (*hook) (const char *filename,
                            enum grub_fshelp_filetype filetype,
                            grub_fshelp_node_t node,
                            void *closure),
                  void *closure)
{
  struct grub_fshelp_node *diro = (struct grub_fshelp_node *) dir;
  struct grub_xfs_iterate_dir_closure c;

  c.hook = hook;
  c.closure = closure;
  c.diro = diro;
  switch (diro->inode.format)
    {
    case XFS_INODE_FORMAT_INO:
      {
      struct grub_xfs_dir_entry *de = &diro->inode.data.dir.direntry[0];
      int smallino = !diro->inode.data.dir.dirhead.smallino;
      int i;
      grub_uint64_t parent;

      /* If small inode numbers are used to pack the direntry, the
         parent inode number is small too.  */
      if (smallino)
        {
          parent = grub_be_to_cpu32 (diro->inode.data.dir.dirhead.parent.i4);
          parent = grub_cpu_to_be64 (parent);
          /* The header is a bit smaller than usual.  */
          de = (struct grub_xfs_dir_entry *) ((char *) de - 4);
        }
      else
        {
          parent = diro->inode.data.dir.dirhead.parent.i8;
        }

      /* Synthesize the direntries for `.' and `..'.  */
      if (call_hook (diro->ino, ".", &c))
        return 1;

      if (call_hook (parent, "..", &c))
        return 1;

      for (i = 0; i < diro->inode.data.dir.dirhead.count; i++)
        {
          grub_uint64_t ino;
          void *inopos = (((char *) de)
                      + sizeof (struct grub_xfs_dir_entry)
                      + de->len - 1);
          char name[de->len + 1];

          if (smallino)
            {
            ino = grub_be_to_cpu32 (*(grub_uint32_t *) inopos);
            ino = grub_cpu_to_be64 (ino);
            }
          else
            ino = *(grub_uint64_t *) inopos;

          grub_memcpy (name, de->name, de->len);
          name[de->len] = '\0';
          if (call_hook (ino, name, &c))
            return 1;

          de = ((struct grub_xfs_dir_entry *)
              (((char *) de)+ sizeof (struct grub_xfs_dir_entry) + de->len
               + ((smallino ? sizeof (grub_uint32_t)
                   : sizeof (grub_uint64_t))) - 1));
        }
      break;
      }

    case XFS_INODE_FORMAT_BTREE:
    case XFS_INODE_FORMAT_EXT:
      {
      grub_ssize_t numread;
      char *dirblock;
      grub_uint64_t blk;
        int dirblk_size, dirblk_log2;

        dirblk_log2 = (dir->data->sblock.log2_bsize
                       + dir->data->sblock.log2_dirblk);
        dirblk_size = 1 << dirblk_log2;

      dirblock = grub_malloc (dirblk_size);
      if (! dirblock)
        return 0;

      /* Iterate over every block the directory has.  */
      for (blk = 0;
           blk < (grub_be_to_cpu64 (dir->inode.size)
                >> dirblk_log2);
           blk++)
        {
          /* The header is skipped, the first direntry is stored
             from byte 16.  */
          int pos = 16;
          int entries;
          int tail_start = (dirblk_size
                        - sizeof (struct grub_xfs_dirblock_tail));

          struct grub_xfs_dirblock_tail *tail;
          tail = (struct grub_xfs_dirblock_tail *) &dirblock[tail_start];

          numread = grub_xfs_read_file (dir, 0, 0, 0,
                                blk << dirblk_log2,
                                dirblk_size, dirblock);
          if (numread != dirblk_size)
            return 0;

          entries = (grub_be_to_cpu32 (tail->leaf_count)
                   - grub_be_to_cpu32 (tail->leaf_stale));

          /* Iterate over all entries within this block.  */
          while (pos < (dirblk_size
                    - (int) sizeof (struct grub_xfs_dir2_entry)))
            {
            struct grub_xfs_dir2_entry *direntry;
            grub_uint16_t *freetag;
            char *filename;

            direntry = (struct grub_xfs_dir2_entry *) &dirblock[pos];
            freetag = (grub_uint16_t *) direntry;

            if (*freetag == 0XFFFF)
              {
                grub_uint16_t *skip = (grub_uint16_t *) (freetag + 1);

                /* This entry is not used, go to the next one.  */
                pos += grub_be_to_cpu16 (*skip);

                continue;
              }

            filename = &dirblock[pos + sizeof (*direntry)];
            /* The byte after the filename is for the tag, which
               is not used by GRUB.  So it can be overwritten.  */
            filename[direntry->len] = '\0';

            if (call_hook (direntry->inode, filename, &c))
              {
                grub_free (dirblock);
                return 1;
              }

            /* Check if last direntry in this block is
               reached.  */
            entries--;
            if (!entries)
              break;

            /* Select the next directory entry.  */
            pos = GRUB_XFS_NEXT_DIRENT (pos, direntry->len);
            pos = GRUB_XFS_ROUND_TO_DIRENT (pos);
            }
        }
      grub_free (dirblock);
      break;
      }

    default:
      grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET,
              "XFS does not support inode format %d yet",
              diro->inode.format);
    }
  return 0;
}


static struct grub_xfs_data *
grub_xfs_mount (grub_disk_t disk)
{
  struct grub_xfs_data *data = 0;

  data = grub_zalloc (sizeof (struct grub_xfs_data));
  if (!data)
    return 0;

  /* Read the superblock.  */
  if (grub_disk_read (disk, 0, 0,
                  sizeof (struct grub_xfs_sblock), &data->sblock))
    goto fail;

  if (grub_strncmp ((char *) (data->sblock.magic), "XFSB", 4))
    {
      grub_error (GRUB_ERR_BAD_FS, "not a XFS filesystem");
      goto fail;
    }

  data = grub_realloc (data,
                   sizeof (struct grub_xfs_data)
                   - sizeof (struct grub_xfs_inode)
                   + (1 << data->sblock.log2_inode));

  if (! data)
    goto fail;

  data->diropen.data = data;
  data->diropen.ino = data->sblock.rootino;
  data->diropen.inode_read = 1;
  data->bsize = grub_be_to_cpu32 (data->sblock.bsize);
  data->agsize = grub_be_to_cpu32 (data->sblock.agsize);

  data->disk = disk;
  data->pos = 0;

  grub_xfs_read_inode (data, data->diropen.ino, &data->diropen.inode);

  return data;
 fail:

  if (grub_errno == GRUB_ERR_OUT_OF_RANGE)
    grub_error (GRUB_ERR_BAD_FS, "not an XFS filesystem");

  grub_free (data);

  return 0;
}

00644 struct grub_xfs_dir_closure
{
  int (*hook) (const char *filename,
             const struct grub_dirhook_info *info,
             void *closure);
  void *closure;
};

static int
iterate (const char *filename,
       enum grub_fshelp_filetype filetype,
       grub_fshelp_node_t node,
       void *closure)
{
  struct grub_xfs_dir_closure *c = closure;
  struct grub_dirhook_info info;
  grub_memset (&info, 0, sizeof (info));
  info.dir = ((filetype & GRUB_FSHELP_TYPE_MASK) == GRUB_FSHELP_DIR);
  grub_free (node);
  return c->hook (filename, &info, c->closure);
}


static grub_err_t
grub_xfs_dir (grub_device_t device, const char *path,
            int (*hook) (const char *filename,
                     const struct grub_dirhook_info *info,
                     void *closure),
            void *closure)
{
  struct grub_xfs_data *data = 0;
  struct grub_fshelp_node *fdiro = 0;
  struct grub_xfs_dir_closure c;

  grub_dl_ref (my_mod);

  data = grub_xfs_mount (device->disk);
  if (!data)
    goto mount_fail;

  grub_fshelp_find_file (path, &data->diropen, &fdiro, grub_xfs_iterate_dir,
                   0, grub_xfs_read_symlink, GRUB_FSHELP_DIR);
  if (grub_errno)
    goto fail;

  c.hook = hook;
  c.closure = closure;
  grub_xfs_iterate_dir (fdiro, iterate, &c);

 fail:
  if (fdiro != &data->diropen)
    grub_free (fdiro);
  grub_free (data);

 mount_fail:

  grub_dl_unref (my_mod);

  return grub_errno;
}


/* Open a file named NAME and initialize FILE.  */
static grub_err_t
grub_xfs_open (struct grub_file *file, const char *name)
{
  struct grub_xfs_data *data;
  struct grub_fshelp_node *fdiro = 0;

  grub_dl_ref (my_mod);

  data = grub_xfs_mount (file->device->disk);
  if (!data)
    goto mount_fail;

  grub_fshelp_find_file (name, &data->diropen, &fdiro, grub_xfs_iterate_dir,
                   0, grub_xfs_read_symlink, GRUB_FSHELP_REG);
  if (grub_errno)
    goto fail;

  if (!fdiro->inode_read)
    {
      grub_xfs_read_inode (data, fdiro->ino, &fdiro->inode);
      if (grub_errno)
      goto fail;
    }

  if (fdiro != &data->diropen)
    grub_memcpy (&data->diropen, fdiro,
             sizeof (struct grub_fshelp_node)
             - sizeof (struct grub_xfs_inode)
             + (1 << data->sblock.log2_inode));

  file->size = grub_be_to_cpu64 (data->diropen.inode.size);
  file->data = data;
  file->offset = 0;

  return 0;

 fail:
  if (fdiro != &data->diropen)
    grub_free (fdiro);
  grub_free (data);

 mount_fail:
  grub_dl_unref (my_mod);

  return grub_errno;
}


static grub_ssize_t
grub_xfs_read (grub_file_t file, char *buf, grub_size_t len)
{
  struct grub_xfs_data *data =
    (struct grub_xfs_data *) file->data;

  return grub_xfs_read_file (&data->diropen, file->read_hook, file->closure,
                       file->flags, file->offset, len, buf);
}


static grub_err_t
grub_xfs_close (grub_file_t file)
{
  grub_free (file->data);

  grub_dl_unref (my_mod);

  return GRUB_ERR_NONE;
}


static grub_err_t
grub_xfs_label (grub_device_t device, char **label)
{
  struct grub_xfs_data *data;
  grub_disk_t disk = device->disk;

  grub_dl_ref (my_mod);

  data = grub_xfs_mount (disk);
  if (data)
    *label = grub_strndup ((char *) (data->sblock.label), 12);
  else
    *label = 0;

  grub_dl_unref (my_mod);

  grub_free (data);

  return grub_errno;
}

static grub_err_t
grub_xfs_uuid (grub_device_t device, char **uuid)
{
  struct grub_xfs_data *data;
  grub_disk_t disk = device->disk;

  grub_dl_ref (my_mod);

  data = grub_xfs_mount (disk);
  if (data)
    {
      *uuid = grub_xasprintf ("%04x%04x-%04x-%04x-%04x-%04x%04x%04x",
                       grub_be_to_cpu16 (data->sblock.uuid[0]),
                       grub_be_to_cpu16 (data->sblock.uuid[1]),
                       grub_be_to_cpu16 (data->sblock.uuid[2]),
                       grub_be_to_cpu16 (data->sblock.uuid[3]),
                       grub_be_to_cpu16 (data->sblock.uuid[4]),
                       grub_be_to_cpu16 (data->sblock.uuid[5]),
                       grub_be_to_cpu16 (data->sblock.uuid[6]),
                       grub_be_to_cpu16 (data->sblock.uuid[7]));
    }
  else
    *uuid = NULL;

  grub_dl_unref (my_mod);

  grub_free (data);

  return grub_errno;
}



struct grub_fs grub_xfs_fs =
  {
    .name = "xfs",
    .dir = grub_xfs_dir,
    .open = grub_xfs_open,
    .read = grub_xfs_read,
    .close = grub_xfs_close,
    .label = grub_xfs_label,
    .uuid = grub_xfs_uuid,
    .next = 0
  };

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