* Patch by Pavel Bartusek, 21 Mar 2004

  Add Reiserfs support

* Patch by Hinko Kocevar, 20 Mar 2004
  - Add auto-release for SMSC LAN91c111 driver
  - Add save/restore of PTR and PNR regs as suggested in datasheet

1 files changed, 986 insertions, 0 deletions

diff --git a/fs/reiserfs/reiserfs.c b/fs/reiserfs/reiserfs.c
new file mode 100644
index 0000000000..ef4baf70a4
--- /dev/null
+++ b/fs/reiserfs/reiserfs.c
@@ -0,0 +1,986 @@
+/*
+ *  Copyright 2000-2002 by Hans Reiser, licensing governed by reiserfs/README
+ *
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2000, 2001  Free Software Foundation, Inc.
+ *
+ *  (C) Copyright 2003 - 2004
+ *  Sysgo AG, <www.elinos.com>, Pavel Bartusek <pba@sysgo.com>
+ *
+ *
+ *  This program 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 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program 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 this program; if not, write to the Free Software
+ *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+/* An implementation for the ReiserFS filesystem ported from GRUB.
+ * Some parts of this code (mainly the structures and defines) are
+ * from the original reiser fs code, as found in the linux kernel.
+ */
+
+#include <common.h>
+#if (CONFIG_COMMANDS & CFG_CMD_REISER)
+
+#include <malloc.h>
+#include <linux/ctype.h>
+#include <linux/time.h>
+#include <asm/byteorder.h>
+#include <reiserfs.h>
+
+#include "reiserfs_private.h"
+
+#undef REISERDEBUG
+
+/* Some parts of this code (mainly the structures and defines) are
+ * from the original reiser fs code, as found in the linux kernel.
+ */
+
+static char fsys_buf[FSYS_BUFLEN];
+static reiserfs_error_t errnum = ERR_NONE;
+static int print_possibilities;
+static unsigned int filepos, filemax;
+
+static int
+substring (const char *s1, const char *s2)
+{
+  while (*s1 == *s2)
+    {
+      /* The strings match exactly. */
+      if (! *(s1++))
+	return 0;
+      s2 ++;
+    }
+
+  /* S1 is a substring of S2. */
+  if (*s1 == 0)
+    return -1;
+
+  /* S1 isn't a substring. */
+  return 1;
+}
+
+static void sd_print_item (struct item_head * ih, char * item)
+{
+    char filetime[30];
+    time_t ttime;
+
+    if (stat_data_v1 (ih)) {
+      	struct stat_data_v1 * sd = (struct stat_data_v1 *)item;
+        ttime = sd_v1_mtime(sd);
+        ctime_r(&ttime, filetime);
+        printf ("%-10s %4hd %6d %6d %9d %24.24s",
+                 bb_mode_string(sd_v1_mode(sd)), sd_v1_nlink(sd),sd_v1_uid(sd), sd_v1_gid(sd),
+                 sd_v1_size(sd), filetime);
+    } else {
+	struct stat_data * sd = (struct stat_data *)item;
+        ttime = sd_v2_mtime(sd);
+        ctime_r(&ttime, filetime);
+        printf ("%-10s %4d %6d %6d %9d %24.24s",
+                 bb_mode_string(sd_v2_mode(sd)), sd_v2_nlink(sd),sd_v2_uid(sd),sd_v2_gid(sd),
+                 (__u32) sd_v2_size(sd), filetime);
+    }
+}
+
+static int
+journal_read (int block, int len, char *buffer)
+{
+  return reiserfs_devread ((INFO->journal_block + block) << INFO->blocksize_shift,
+	 	           0, len, buffer);
+}
+
+/* Read a block from ReiserFS file system, taking the journal into
+ * account.  If the block nr is in the journal, the block from the
+ * journal taken.
+ */
+static int
+block_read (unsigned int blockNr, int start, int len, char *buffer)
+{
+  int transactions = INFO->journal_transactions;
+  int desc_block = INFO->journal_first_desc;
+  int journal_mask = INFO->journal_block_count - 1;
+  int translatedNr = blockNr;
+  __u32 *journal_table = JOURNAL_START;
+  while (transactions-- > 0)
+    {
+      int i = 0;
+      int j_len;
+      if (__le32_to_cpu(*journal_table) != 0xffffffff)
+	{
+	  /* Search for the blockNr in cached journal */
+	  j_len = __le32_to_cpu(*journal_table++);
+	  while (i++ < j_len)
+	    {
+	      if (__le32_to_cpu(*journal_table++) == blockNr)
+		{
+		  journal_table += j_len - i;
+		  goto found;
+		}
+	    }
+	}
+      else
+	{
+	  /* This is the end of cached journal marker.  The remaining
+	   * transactions are still on disk.
+	   */
+	  struct reiserfs_journal_desc   desc;
+	  struct reiserfs_journal_commit commit;
+
+	  if (! journal_read (desc_block, sizeof (desc), (char *) &desc))
+	    return 0;
+
+	  j_len = __le32_to_cpu(desc.j_len);
+	  while (i < j_len && i < JOURNAL_TRANS_HALF)
+	    if (__le32_to_cpu(desc.j_realblock[i++]) == blockNr)
+	      goto found;
+
+	  if (j_len >= JOURNAL_TRANS_HALF)
+	    {
+	      int commit_block = (desc_block + 1 + j_len) & journal_mask;
+	      if (! journal_read (commit_block,
+				  sizeof (commit), (char *) &commit))
+		return 0;
+	      while (i < j_len)
+		if (__le32_to_cpu(commit.j_realblock[i++ - JOURNAL_TRANS_HALF]) == blockNr)
+		  goto found;
+	    }
+	}
+      goto not_found;
+
+    found:
+      translatedNr = INFO->journal_block + ((desc_block + i) & journal_mask);
+#ifdef REISERDEBUG
+      printf ("block_read: block %d is mapped to journal block %d.\n",
+	      blockNr, translatedNr - INFO->journal_block);
+#endif
+      /* We must continue the search, as this block may be overwritten
+       * in later transactions.
+       */
+    not_found:
+      desc_block = (desc_block + 2 + j_len) & journal_mask;
+    }
+  return reiserfs_devread (translatedNr << INFO->blocksize_shift, start, len, buffer);
+}
+
+/* Init the journal data structure.  We try to cache as much as
+ * possible in the JOURNAL_START-JOURNAL_END space, but if it is full
+ * we can still read the rest from the disk on demand.
+ *
+ * The first number of valid transactions and the descriptor block of the
+ * first valid transaction are held in INFO.  The transactions are all
+ * adjacent, but we must take care of the journal wrap around.
+ */
+static int
+journal_init (void)
+{
+  unsigned int block_count = INFO->journal_block_count;
+  unsigned int desc_block;
+  unsigned int commit_block;
+  unsigned int next_trans_id;
+  struct reiserfs_journal_header header;
+  struct reiserfs_journal_desc   desc;
+  struct reiserfs_journal_commit commit;
+  __u32 *journal_table = JOURNAL_START;
+
+  journal_read (block_count, sizeof (header), (char *) &header);
+  desc_block = __le32_to_cpu(header.j_first_unflushed_offset);
+  if (desc_block >= block_count)
+    return 0;
+
+  INFO->journal_first_desc = desc_block;
+  next_trans_id = __le32_to_cpu(header.j_last_flush_trans_id) + 1;
+
+#ifdef REISERDEBUG
+  printf ("journal_init: last flushed %d\n",
+	  __le32_to_cpu(header.j_last_flush_trans_id));
+#endif
+
+  while (1)
+    {
+      journal_read (desc_block, sizeof (desc), (char *) &desc);
+      if (substring (JOURNAL_DESC_MAGIC, desc.j_magic) > 0
+	  || __le32_to_cpu(desc.j_trans_id) != next_trans_id
+	  || __le32_to_cpu(desc.j_mount_id) != __le32_to_cpu(header.j_mount_id))
+	/* no more valid transactions */
+	break;
+
+      commit_block = (desc_block + __le32_to_cpu(desc.j_len) + 1) & (block_count - 1);
+      journal_read (commit_block, sizeof (commit), (char *) &commit);
+      if (__le32_to_cpu(desc.j_trans_id) != commit.j_trans_id
+	  || __le32_to_cpu(desc.j_len) != __le32_to_cpu(commit.j_len))
+	/* no more valid transactions */
+	break;
+
+#ifdef REISERDEBUG
+      printf ("Found valid transaction %d/%d at %d.\n",
+	      __le32_to_cpu(desc.j_trans_id), __le32_to_cpu(desc.j_mount_id), desc_block);
+#endif
+
+      next_trans_id++;
+      if (journal_table < JOURNAL_END)
+	{
+	  if ((journal_table + 1 + __le32_to_cpu(desc.j_len)) >= JOURNAL_END)
+	    {
+	      /* The table is almost full; mark the end of the cached
+	       * journal.*/
+	      *journal_table = __cpu_to_le32(0xffffffff);
+	      journal_table = JOURNAL_END;
+	    }
+	  else
+	    {
+	      unsigned int i;
+	      /* Cache the length and the realblock numbers in the table.
+	       * The block number of descriptor can easily be computed.
+	       * and need not to be stored here.
+	       */
+
+	      /* both are in the little endian format */
+	      *journal_table++ = desc.j_len;
+	      for (i = 0; i < __le32_to_cpu(desc.j_len) && i < JOURNAL_TRANS_HALF; i++)
+		{
+	      	  /* both are in the little endian format */
+		  *journal_table++ = desc.j_realblock[i];
+#ifdef REISERDEBUG
+		  printf ("block %d is in journal %d.\n",
+			  __le32_to_cpu(desc.j_realblock[i]), desc_block);
+#endif
+		}
+	      for (     ; i < __le32_to_cpu(desc.j_len); i++)
+		{
+		  /* both are in the little endian format */
+		  *journal_table++ = commit.j_realblock[i-JOURNAL_TRANS_HALF];
+#ifdef REISERDEBUG
+		  printf ("block %d is in journal %d.\n",
+			  __le32_to_cpu(commit.j_realblock[i-JOURNAL_TRANS_HALF]),
+			  desc_block);
+#endif
+		}
+	    }
+	}
+      desc_block = (commit_block + 1) & (block_count - 1);
+    }
+#ifdef REISERDEBUG
+  printf ("Transaction %d/%d at %d isn't valid.\n",
+	  __le32_to_cpu(desc.j_trans_id), __le32_to_cpu(desc.j_mount_id), desc_block);
+#endif
+
+  INFO->journal_transactions
+    = next_trans_id - __le32_to_cpu(header.j_last_flush_trans_id) - 1;
+  return errnum == 0;
+}
+
+/* check filesystem types and read superblock into memory buffer */
+int
+reiserfs_mount (unsigned part_length)
+{
+  struct reiserfs_super_block super;
+  int superblock = REISERFS_DISK_OFFSET_IN_BYTES >> SECTOR_BITS;
+
+  if (part_length < superblock + (sizeof (super) >> SECTOR_BITS)
+      || ! reiserfs_devread (superblock, 0, sizeof (struct reiserfs_super_block),
+		             (char *) &super)
+      || (substring (REISER3FS_SUPER_MAGIC_STRING, super.s_magic) > 0
+	  && substring (REISER2FS_SUPER_MAGIC_STRING, super.s_magic) > 0
+	  && substring (REISERFS_SUPER_MAGIC_STRING, super.s_magic) > 0)
+      || (/* check that this is not a copy inside the journal log */
+	  sb_journal_block(&super) * sb_blocksize(&super)
+	  <= REISERFS_DISK_OFFSET_IN_BYTES))
+    {
+      /* Try old super block position */
+      superblock = REISERFS_OLD_DISK_OFFSET_IN_BYTES >> SECTOR_BITS;
+      if (part_length < superblock + (sizeof (super) >> SECTOR_BITS)
+	  || ! reiserfs_devread (superblock, 0, sizeof (struct reiserfs_super_block),
+			         (char *) &super))
+	return 0;
+
+      if (substring (REISER2FS_SUPER_MAGIC_STRING, super.s_magic) > 0
+	  && substring (REISERFS_SUPER_MAGIC_STRING, super.s_magic) > 0)
+	{
+	  /* pre journaling super block ? */
+	  if (substring (REISERFS_SUPER_MAGIC_STRING,
+			 (char*) ((int) &super + 20)) > 0)
+	    return 0;
+
+	  set_sb_blocksize(&super, REISERFS_OLD_BLOCKSIZE);
+	  set_sb_journal_block(&super, 0);
+	  set_sb_version(&super, 0);
+	}
+    }
+
+  /* check the version number.  */
+  if (sb_version(&super) > REISERFS_MAX_SUPPORTED_VERSION)
+    return 0;
+
+  INFO->version = sb_version(&super);
+  INFO->blocksize = sb_blocksize(&super);
+  INFO->fullblocksize_shift = log2 (sb_blocksize(&super));
+  INFO->blocksize_shift = INFO->fullblocksize_shift - SECTOR_BITS;
+  INFO->cached_slots =
+    (FSYSREISER_CACHE_SIZE >> INFO->fullblocksize_shift) - 1;
+
+#ifdef REISERDEBUG
+  printf ("reiserfs_mount: version=%d, blocksize=%d\n",
+	  INFO->version, INFO->blocksize);
+#endif /* REISERDEBUG */
+
+  /* Clear node cache. */
+  memset (INFO->blocks, 0, sizeof (INFO->blocks));
+
+  if (sb_blocksize(&super) < FSYSREISER_MIN_BLOCKSIZE
+      || sb_blocksize(&super) > FSYSREISER_MAX_BLOCKSIZE
+      || (SECTOR_SIZE << INFO->blocksize_shift) != sb_blocksize(&super))
+    return 0;
+
+  /* Initialize journal code.  If something fails we end with zero
+   * journal_transactions, so we don't access the journal at all.
+   */
+  INFO->journal_transactions = 0;
+  if (sb_journal_block(&super) != 0 && super.s_journal_dev == 0)
+    {
+      INFO->journal_block = sb_journal_block(&super);
+      INFO->journal_block_count = sb_journal_size(&super);
+      if (is_power_of_two (INFO->journal_block_count))
+	journal_init ();
+
+      /* Read in super block again, maybe it is in the journal */
+      block_read (superblock >> INFO->blocksize_shift,
+		  0, sizeof (struct reiserfs_super_block), (char *) &super);
+    }
+
+  if (! block_read (sb_root_block(&super), 0, INFO->blocksize, (char*) ROOT))
+    return 0;
+
+  INFO->tree_depth = __le16_to_cpu(BLOCKHEAD (ROOT)->blk_level);
+
+#ifdef REISERDEBUG
+  printf ("root read_in: block=%d, depth=%d\n",
+	  sb_root_block(&super), INFO->tree_depth);
+#endif /* REISERDEBUG */
+
+  if (INFO->tree_depth >= MAX_HEIGHT)
+    return 0;
+  if (INFO->tree_depth == DISK_LEAF_NODE_LEVEL)
+    {
+      /* There is only one node in the whole filesystem,
+       * which is simultanously leaf and root */
+      memcpy (LEAF, ROOT, INFO->blocksize);
+    }
+  return 1;
+}
+
+/***************** TREE ACCESSING METHODS *****************************/
+
+/* I assume you are familiar with the ReiserFS tree, if not go to
+ * http://www.namesys.com/content_table.html
+ *
+ * My tree node cache is organized as following
+ *   0   ROOT node
+ *   1   LEAF node  (if the ROOT is also a LEAF it is copied here
+ *   2-n other nodes on current path from bottom to top.
+ *       if there is not enough space in the cache, the top most are
+ *       omitted.
+ *
+ * I have only two methods to find a key in the tree:
+ *   search_stat(dir_id, objectid) searches for the stat entry (always
+ *       the first entry) of an object.
+ *   next_key() gets the next key in tree order.
+ *
+ * This means, that I can only sequential reads of files are
+ * efficient, but this really doesn't hurt for grub.
+ */
+
+/* Read in the node at the current path and depth into the node cache.
+ * You must set INFO->blocks[depth] before.
+ */
+static char *
+read_tree_node (unsigned int blockNr, int depth)
+{
+  char* cache = CACHE(depth);
+  int num_cached = INFO->cached_slots;
+  if (depth < num_cached)
+    {
+      /* This is the cached part of the path.  Check if same block is
+       * needed.
+       */
+      if (blockNr == INFO->blocks[depth])
+	return cache;
+    }
+  else
+    cache = CACHE(num_cached);
+
+#ifdef REISERDEBUG
+  printf ("  next read_in: block=%d (depth=%d)\n",
+	  blockNr, depth);
+#endif /* REISERDEBUG */
+  if (! block_read (blockNr, 0, INFO->blocksize, cache))
+    return 0;
+  /* Make sure it has the right node level */
+  if (__le16_to_cpu(BLOCKHEAD (cache)->blk_level) != depth)
+    {
+      errnum = ERR_FSYS_CORRUPT;
+      return 0;
+    }
+
+  INFO->blocks[depth] = blockNr;
+  return cache;
+}
+
+/* Get the next key, i.e. the key following the last retrieved key in
+ * tree order.  INFO->current_ih and
+ * INFO->current_info are adapted accordingly.  */
+static int
+next_key (void)
+{
+  int depth;
+  struct item_head *ih = INFO->current_ih + 1;
+  char *cache;
+
+#ifdef REISERDEBUG
+  printf ("next_key:\n  old ih: key %d:%d:%d:%d version:%d\n",
+	  __le32_to_cpu(INFO->current_ih->ih_key.k_dir_id),
+	  __le32_to_cpu(INFO->current_ih->ih_key.k_objectid),
+	  __le32_to_cpu(INFO->current_ih->ih_key.u.v1.k_offset),
+	  __le32_to_cpu(INFO->current_ih->ih_key.u.v1.k_uniqueness),
+	  __le16_to_cpu(INFO->current_ih->ih_version));
+#endif /* REISERDEBUG */
+
+  if (ih == &ITEMHEAD[__le16_to_cpu(BLOCKHEAD (LEAF)->blk_nr_item)])
+    {
+      depth = DISK_LEAF_NODE_LEVEL;
+      /* The last item, was the last in the leaf node.
+       * Read in the next block
+       */
+      do
+	{
+	  if (depth == INFO->tree_depth)
+	    {
+	      /* There are no more keys at all.
+	       * Return a dummy item with MAX_KEY */
+	      ih = (struct item_head *) &BLOCKHEAD (LEAF)->blk_right_delim_key;
+	      goto found;
+	    }
+	  depth++;
+#ifdef REISERDEBUG
+	  printf ("  depth=%d, i=%d\n", depth, INFO->next_key_nr[depth]);
+#endif /* REISERDEBUG */
+	}
+      while (INFO->next_key_nr[depth] == 0);
+
+      if (depth == INFO->tree_depth)
+	cache = ROOT;
+      else if (depth <= INFO->cached_slots)
+	cache = CACHE (depth);
+      else
+	{
+	  cache = read_tree_node (INFO->blocks[depth], depth);
+	  if (! cache)
+	    return 0;
+	}
+
+      do
+	{
+	  int nr_item = __le16_to_cpu(BLOCKHEAD (cache)->blk_nr_item);
+	  int key_nr = INFO->next_key_nr[depth]++;
+#ifdef REISERDEBUG
+	  printf ("  depth=%d, i=%d/%d\n", depth, key_nr, nr_item);
+#endif /* REISERDEBUG */
+	  if (key_nr == nr_item)
+	    /* This is the last item in this block, set the next_key_nr to 0 */
+	    INFO->next_key_nr[depth] = 0;
+
+	  cache = read_tree_node (dc_block_number(&(DC (cache)[key_nr])), --depth);
+	  if (! cache)
+	    return 0;
+	}
+      while (depth > DISK_LEAF_NODE_LEVEL);
+
+      ih = ITEMHEAD;
+    }
+ found:
+  INFO->current_ih   = ih;
+  INFO->current_item = &LEAF[__le16_to_cpu(ih->ih_item_location)];
+#ifdef REISERDEBUG
+  printf ("  new ih: key %d:%d:%d:%d version:%d\n",
+	  __le32_to_cpu(INFO->current_ih->ih_key.k_dir_id),
+	  __le32_to_cpu(INFO->current_ih->ih_key.k_objectid),
+	  __le32_to_cpu(INFO->current_ih->ih_key.u.v1.k_offset),
+	  __le32_to_cpu(INFO->current_ih->ih_key.u.v1.k_uniqueness),
+	  __le16_to_cpu(INFO->current_ih->ih_version));
+#endif /* REISERDEBUG */
+  return 1;
+}
+
+/* preconditions: reiserfs_mount already executed, therefore
+ *   INFO block is valid
+ * returns: 0 if error (errnum is set),
+ *   nonzero iff we were able to find the key successfully.
+ * postconditions: on a nonzero return, the current_ih and
+ *   current_item fields describe the key that equals the
+ *   searched key.  INFO->next_key contains the next key after
+ *   the searched key.
+ * side effects: messes around with the cache.
+ */
+static int
+search_stat (__u32 dir_id, __u32 objectid)
+{
+  char *cache;
+  int depth;
+  int nr_item;
+  int i;
+  struct item_head *ih;
+#ifdef REISERDEBUG
+  printf ("search_stat:\n  key %d:%d:0:0\n", dir_id, objectid);
+#endif /* REISERDEBUG */
+
+  depth = INFO->tree_depth;
+  cache = ROOT;
+
+  while (depth > DISK_LEAF_NODE_LEVEL)
+    {
+      struct key *key;
+      nr_item = __le16_to_cpu(BLOCKHEAD (cache)->blk_nr_item);
+
+      key = KEY (cache);
+
+      for (i = 0; i < nr_item; i++)
+	{
+	  if (__le32_to_cpu(key->k_dir_id) > dir_id
+	      || (__le32_to_cpu(key->k_dir_id) == dir_id
+		  && (__le32_to_cpu(key->k_objectid) > objectid
+		      || (__le32_to_cpu(key->k_objectid) == objectid
+			  && (__le32_to_cpu(key->u.v1.k_offset)
+			      | __le32_to_cpu(key->u.v1.k_uniqueness)) > 0))))
+	    break;
+	  key++;
+	}
+
+#ifdef REISERDEBUG
+      printf ("  depth=%d, i=%d/%d\n", depth, i, nr_item);
+#endif /* REISERDEBUG */
+      INFO->next_key_nr[depth] = (i == nr_item) ? 0 : i+1;
+      cache = read_tree_node (dc_block_number(&(DC (cache)[i])), --depth);
+      if (! cache)
+	return 0;
+    }
+
+  /* cache == LEAF */
+  nr_item = __le16_to_cpu(BLOCKHEAD (LEAF)->blk_nr_item);
+  ih = ITEMHEAD;
+  for (i = 0; i < nr_item; i++)
+    {
+      if (__le32_to_cpu(ih->ih_key.k_dir_id) == dir_id
+	  && __le32_to_cpu(ih->ih_key.k_objectid) == objectid
+	  && __le32_to_cpu(ih->ih_key.u.v1.k_offset) == 0
+	  && __le32_to_cpu(ih->ih_key.u.v1.k_uniqueness) == 0)
+	{
+#ifdef REISERDEBUG
+	  printf ("  depth=%d, i=%d/%d\n", depth, i, nr_item);
+#endif /* REISERDEBUG */
+	  INFO->current_ih   = ih;
+	  INFO->current_item = &LEAF[__le16_to_cpu(ih->ih_item_location)];
+	  return 1;
+	}
+      ih++;
+    }
+  errnum = ERR_FSYS_CORRUPT;
+  return 0;
+}
+
+int
+reiserfs_read (char *buf, unsigned len)
+{
+  unsigned int blocksize;
+  unsigned int offset;
+  unsigned int to_read;
+  char *prev_buf = buf;
+
+#ifdef REISERDEBUG
+  printf ("reiserfs_read: filepos=%d len=%d, offset=%Lx\n",
+	  filepos, len, (__u64) IH_KEY_OFFSET (INFO->current_ih) - 1);
+#endif /* REISERDEBUG */
+
+  if (__le32_to_cpu(INFO->current_ih->ih_key.k_objectid) != INFO->fileinfo.k_objectid
+      || IH_KEY_OFFSET (INFO->current_ih) > filepos + 1)
+    {
+      search_stat (INFO->fileinfo.k_dir_id, INFO->fileinfo.k_objectid);
+      goto get_next_key;
+    }
+
+  while (! errnum)
+    {
+      if (__le32_to_cpu(INFO->current_ih->ih_key.k_objectid) != INFO->fileinfo.k_objectid) {
+	break;
+      }
+
+      offset = filepos - IH_KEY_OFFSET (INFO->current_ih) + 1;
+      blocksize = __le16_to_cpu(INFO->current_ih->ih_item_len);
+
+#ifdef REISERDEBUG
+      printf ("  loop: filepos=%d len=%d, offset=%d blocksize=%d\n",
+	      filepos, len, offset, blocksize);
+#endif /* REISERDEBUG */
+
+      if (IH_KEY_ISTYPE(INFO->current_ih, TYPE_DIRECT)
+	  && offset < blocksize)
+	{
+#ifdef REISERDEBUG
+	  printf ("direct_read: offset=%d, blocksize=%d\n",
+		  offset, blocksize);
+#endif /* REISERDEBUG */
+	  to_read = blocksize - offset;
+	  if (to_read > len)
+	    to_read = len;
+
+	  memcpy (buf, INFO->current_item + offset, to_read);
+	  goto update_buf_len;
+	}
+      else if (IH_KEY_ISTYPE(INFO->current_ih, TYPE_INDIRECT))
+	{
+	  blocksize = (blocksize >> 2) << INFO->fullblocksize_shift;
+#ifdef REISERDEBUG
+	  printf ("indirect_read: offset=%d, blocksize=%d\n",
+		  offset, blocksize);
+#endif /* REISERDEBUG */
+
+	  while (offset < blocksize)
+	    {
+	      __u32 blocknr = __le32_to_cpu(((__u32 *) INFO->current_item)
+		[offset >> INFO->fullblocksize_shift]);
+	      int blk_offset = offset & (INFO->blocksize-1);
+	      to_read = INFO->blocksize - blk_offset;
+	      if (to_read > len)
+		to_read = len;
+
+	      /* Journal is only for meta data.  Data blocks can be read
+	       * directly without using block_read
+	       */
+	      reiserfs_devread (blocknr << INFO->blocksize_shift,
+	 	                blk_offset, to_read, buf);
+	    update_buf_len:
+	      len -= to_read;
+	      buf += to_read;
+	      offset += to_read;
+	      filepos += to_read;
+	      if (len == 0)
+		goto done;
+	    }
+	}
+    get_next_key:
+      next_key ();
+    }
+ done:
+  return errnum ? 0 : buf - prev_buf;
+}
+
+
+/* preconditions: reiserfs_mount already executed, therefore
+ *   INFO block is valid
+ * returns: 0 if error, nonzero iff we were able to find the file successfully
+ * postconditions: on a nonzero return, INFO->fileinfo contains the info
+ *   of the file we were trying to look up, filepos is 0 and filemax is
+ *   the size of the file.
+ */
+static int
+reiserfs_dir (char *dirname)
+{
+  struct reiserfs_de_head *de_head;
+  char *rest, ch;
+  __u32 dir_id, objectid, parent_dir_id = 0, parent_objectid = 0;
+#ifndef STAGE1_5
+  int do_possibilities = 0;
+#endif /* ! STAGE1_5 */
+  char linkbuf[PATH_MAX];	/* buffer for following symbolic links */
+  int link_count = 0;
+  int mode;
+
+  dir_id = REISERFS_ROOT_PARENT_OBJECTID;
+  objectid = REISERFS_ROOT_OBJECTID;
+
+  while (1)
+    {
+#ifdef REISERDEBUG
+      printf ("dirname=%s\n", dirname);
+#endif /* REISERDEBUG */
+
+      /* Search for the stat info first. */
+      if (! search_stat (dir_id, objectid))
+	return 0;
+
+#ifdef REISERDEBUG
+       printf ("sd_mode=%x sd_size=%d\n",
+               stat_data_v1(INFO->current_ih) ? sd_v1_mode((struct stat_data_v1 *) INFO->current_item) :
+                                                sd_v2_mode((struct stat_data *) (INFO->current_item)),
+               stat_data_v1(INFO->current_ih) ? sd_v1_size((struct stat_data_v1 *) INFO->current_item) :
+                                                sd_v2_size((struct stat_data *) INFO->current_item)
+              );
+
+#endif /* REISERDEBUG */
+      mode = stat_data_v1(INFO->current_ih) ?
+               sd_v1_mode((struct stat_data_v1 *) INFO->current_item) :
+	       sd_v2_mode((struct stat_data *) INFO->current_item);
+
+      /* If we've got a symbolic link, then chase it. */
+      if (S_ISLNK (mode))
+	{
+	  unsigned int len;
+	  if (++link_count > MAX_LINK_COUNT)
+	    {
+	      errnum = ERR_SYMLINK_LOOP;
+	      return 0;
+	    }
+
+	  /* Get the symlink size. */
+	  filemax = stat_data_v1(INFO->current_ih) ?
+	             sd_v1_size((struct stat_data_v1 *) INFO->current_item) :
+	             sd_v2_size((struct stat_data *) INFO->current_item);
+
+	  /* Find out how long our remaining name is. */
+	  len = 0;
+	  while (dirname[len] && !isspace (dirname[len]))
+	    len++;
+
+	  if (filemax + len > sizeof (linkbuf) - 1)
+	    {
+	      errnum = ERR_FILELENGTH;
+	      return 0;
+	    }
+
+	  /* Copy the remaining name to the end of the symlink data.
+	     Note that DIRNAME and LINKBUF may overlap! */
+	  memmove (linkbuf + filemax, dirname, len+1);
+
+	  INFO->fileinfo.k_dir_id = dir_id;
+	  INFO->fileinfo.k_objectid = objectid;
+  	  filepos = 0;
+	  if (! next_key ()
+	      || reiserfs_read (linkbuf, filemax) != filemax)
+	    {
+	      if (! errnum)
+		errnum = ERR_FSYS_CORRUPT;
+	      return 0;
+	    }
+
+#ifdef REISERDEBUG
+	  printf ("symlink=%s\n", linkbuf);
+#endif /* REISERDEBUG */
+
+	  dirname = linkbuf;
+	  if (*dirname == '/')
+	    {
+	      /* It's an absolute link, so look it up in root. */
+	      dir_id = REISERFS_ROOT_PARENT_OBJECTID;
+	      objectid = REISERFS_ROOT_OBJECTID;
+	    }
+	  else
+	    {
+	      /* Relative, so look it up in our parent directory. */
+	      dir_id   = parent_dir_id;
+	      objectid = parent_objectid;
+	    }
+
+	  /* Now lookup the new name. */
+	  continue;
+	}
+
+      /* if we have a real file (and we're not just printing possibilities),
+	 then this is where we want to exit */
+
+      if (! *dirname || isspace (*dirname))
+	{
+	  if (! S_ISREG (mode))
+	    {
+	      errnum = ERR_BAD_FILETYPE;
+	      return 0;
+	    }
+
+	  filepos = 0;
+	  filemax = stat_data_v1(INFO->current_ih) ?
+	              sd_v1_size((struct stat_data_v1 *) INFO->current_item) :
+	              sd_v2_size((struct stat_data *) INFO->current_item);
+#if 0
+	  /* If this is a new stat data and size is > 4GB set filemax to
+	   * maximum
+	   */
+	  if (__le16_to_cpu(INFO->current_ih->ih_version) == ITEM_VERSION_2
+	      && sd_size_hi((struct stat_data *) INFO->current_item) > 0)
+	    filemax = 0xffffffff;
+#endif
+	  INFO->fileinfo.k_dir_id = dir_id;
+	  INFO->fileinfo.k_objectid = objectid;
+	  return next_key ();
+	}
+
+      /* continue with the file/directory name interpretation */
+      while (*dirname == '/')
+	dirname++;
+      if (! S_ISDIR (mode))
+	{
+	  errnum = ERR_BAD_FILETYPE;
+	  return 0;
+	}
+      for (rest = dirname; (ch = *rest) && ! isspace (ch) && ch != '/'; rest++);
+      *rest = 0;
+
+# ifndef STAGE1_5
+      if (print_possibilities && ch != '/')
+	do_possibilities = 1;
+# endif /* ! STAGE1_5 */
+
+      while (1)
+	{
+	  char *name_end;
+	  int num_entries;
+
+	  if (! next_key ())
+	    return 0;
+#ifdef REISERDEBUG
+	  printf ("ih: key %d:%d:%d:%d version:%d\n",
+		  __le32_to_cpu(INFO->current_ih->ih_key.k_dir_id),
+		  __le32_to_cpu(INFO->current_ih->ih_key.k_objectid),
+		  __le32_to_cpu(INFO->current_ih->ih_key.u.v1.k_offset),
+		  __le32_to_cpu(INFO->current_ih->ih_key.u.v1.k_uniqueness),
+		  __le16_to_cpu(INFO->current_ih->ih_version));
+#endif /* REISERDEBUG */
+
+	  if (__le32_to_cpu(INFO->current_ih->ih_key.k_objectid) != objectid)
+	    break;
+
+	  name_end = INFO->current_item + __le16_to_cpu(INFO->current_ih->ih_item_len);
+	  de_head = (struct reiserfs_de_head *) INFO->current_item;
+	  num_entries = __le16_to_cpu(INFO->current_ih->u.ih_entry_count);
+	  while (num_entries > 0)
+	    {
+	      char *filename = INFO->current_item + deh_location(de_head);
+	      char  tmp = *name_end;
+	      if ((deh_state(de_head) & DEH_Visible))
+		{
+		  int cmp;
+		  /* Directory names in ReiserFS are not null
+		   * terminated.  We write a temporary 0 behind it.
+		   * NOTE: that this may overwrite the first block in
+		   * the tree cache.  That doesn't hurt as long as we
+		   * don't call next_key () in between.
+		   */
+		  *name_end = 0;
+		  cmp = substring (dirname, filename);
+		  *name_end = tmp;
+# ifndef STAGE1_5
+		  if (do_possibilities)
+		    {
+		      if (cmp <= 0)
+			{
+			  char fn[PATH_MAX];
+                          struct fsys_reiser_info info_save;
+
+			  if (print_possibilities > 0)
+			    print_possibilities = -print_possibilities;
+			  *name_end = 0;
+			  strcpy(fn, filename);
+                          *name_end = tmp;
+
+			  /* If NAME is "." or "..", do not count it.  */
+                          if (strcmp (fn, ".") != 0 && strcmp (fn, "..") != 0) {
+                            memcpy(&info_save, INFO, sizeof(struct fsys_reiser_info));
+                            search_stat (deh_dir_id(de_head), deh_objectid(de_head));
+                            sd_print_item(INFO->current_ih, INFO->current_item);
+                            printf(" %s\n", fn);
+                            search_stat (dir_id, objectid);
+                            memcpy(INFO, &info_save, sizeof(struct fsys_reiser_info));
+			  }
+			}
+		    }
+		  else
+# endif /* ! STAGE1_5 */
+		    if (cmp == 0)
+		      goto found;
+		}
+	      /* The beginning of this name marks the end of the next name.
+	       */
+	      name_end = filename;
+	      de_head++;
+	      num_entries--;
+	    }
+	}
+
+# ifndef STAGE1_5
+      if (print_possibilities < 0)
+	return 1;
+# endif /* ! STAGE1_5 */
+
+      errnum = ERR_FILE_NOT_FOUND;
+      *rest = ch;
+      return 0;
+
+    found:
+      *rest = ch;
+      dirname = rest;
+
+      parent_dir_id = dir_id;
+      parent_objectid = objectid;
+      dir_id = deh_dir_id(de_head);
+      objectid = deh_objectid(de_head);
+    }
+}
+
+/*
+ * U-Boot interface functions
+ */
+
+/*
+ * List given directory
+ *
+ * RETURN: 0 - OK, else grub_error_t errnum
+ */
+int
+reiserfs_ls (char *dirname)
+{
+	char *dir_slash;
+	int res;
+
+	errnum = 0;
+	dir_slash = malloc(strlen(dirname) + 1);
+	if (dir_slash == NULL) {
+		return ERR_NUMBER_OVERFLOW;
+	}
+	strcpy(dir_slash, dirname);
+	/* add "/" to the directory name */
+	strcat(dir_slash, "/");
+
+	print_possibilities = 1;
+	res = reiserfs_dir (dir_slash);
+	free(dir_slash);
+	if (!res || errnum) {
+		return errnum;
+	}
+
+	return 0;
+}
+
+/*
+ * Open file for reading
+ *
+ * RETURN: >0 - OK, size of opened file
+ *         <0 - ERROR  -grub_error_t errnum
+ */
+int
+reiserfs_open (char *filename)
+{
+	/* open the file */
+	errnum = 0;
+	print_possibilities = 0;
+	if (!reiserfs_dir (filename) || errnum) {
+		return -errnum;
+	}
+	return filemax;
+}
+
+#endif /* CFG_CMD_REISER */