--- /dev/null
+/*
+ * 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>
+ *
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+/* 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>
+#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;
+ char *cache;
+
+ 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;
+
+ cache = ROOT;
+ INFO->tree_depth = __le16_to_cpu(BLOCKHEAD (cache)->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;
+}
Code Review / kvmfornfv.git / blobdiff