patch-2.4.15 linux/fs/ext2/ialloc.c

• Lines: 647
• Date: Sun Nov 11 09:59:56 2001
• Orig file: v2.4.14/linux/fs/ext2/ialloc.c
• Orig date: Tue Oct 9 17:06:53 2001

diff -u --recursive --new-file v2.4.14/linux/fs/ext2/ialloc.c linux/fs/ext2/ialloc.c
@@ -39,37 +39,27 @@
  * Read the inode allocation bitmap for a given block_group, reading
  * into the specified slot in the superblock's bitmap cache.
  *
- * Return >=0 on success or a -ve error code.
+ * Return buffer_head of bitmap on success or NULL.
  */
-static int read_inode_bitmap (struct super_block * sb,
-			       unsigned long block_group,
-			       unsigned int bitmap_nr)
+static struct buffer_head *read_inode_bitmap (struct super_block * sb,
+					       unsigned long block_group)
 {
-	struct ext2_group_desc * gdp;
-	struct buffer_head * bh = NULL;
-	int retval = 0;
-
-	gdp = ext2_get_group_desc (sb, block_group, NULL);
-	if (!gdp) {
-		retval = -EIO;
+	struct ext2_group_desc *desc;
+	struct buffer_head *bh = NULL;
+
+	desc = ext2_get_group_desc(sb, block_group, NULL);
+	if (!desc)
 		goto error_out;
-	}
-	bh = bread (sb->s_dev, le32_to_cpu(gdp->bg_inode_bitmap), sb->s_blocksize);
-	if (!bh) {
+
+	bh = bread(sb->s_dev, le32_to_cpu(desc->bg_inode_bitmap),
+			sb->s_blocksize);
+	if (!bh)
 		ext2_error (sb, "read_inode_bitmap",
 			    "Cannot read inode bitmap - "
 			    "block_group = %lu, inode_bitmap = %lu",
-			    block_group, (unsigned long) gdp->bg_inode_bitmap);
-		retval = -EIO;
-	}
-	/*
-	 * On IO error, just leave a zero in the superblock's block pointer for
-	 * this group.  The IO will be retried next time.
-	 */
+			    block_group, (unsigned long) desc->bg_inode_bitmap);
 error_out:
-	sb->u.ext2_sb.s_inode_bitmap_number[bitmap_nr] = block_group;
-	sb->u.ext2_sb.s_inode_bitmap[bitmap_nr] = bh;
-	return retval;
+	return bh;
 }
 
 /*
@@ -83,79 +73,62 @@
  * 2/ If the file system contains less than EXT2_MAX_GROUP_LOADED groups,
  *    this function reads the bitmap without maintaining a LRU cache.
  * 
- * Return the slot used to store the bitmap, or a -ve error code.
+ * Return the buffer_head of the bitmap or the ERR_PTR(error)
  */
-static int load_inode_bitmap (struct super_block * sb,
-			      unsigned int block_group)
+static struct buffer_head *load_inode_bitmap (struct super_block * sb,
+					      unsigned int block_group)
 {
-	int i, j, retval = 0;
-	unsigned long inode_bitmap_number;
-	struct buffer_head * inode_bitmap;
+	int i, slot = 0;
+	struct ext2_sb_info *sbi = &sb->u.ext2_sb;
+	struct buffer_head *bh = sbi->s_inode_bitmap[0];
 
-	if (block_group >= sb->u.ext2_sb.s_groups_count)
+	if (block_group >= sbi->s_groups_count)
 		ext2_panic (sb, "load_inode_bitmap",
 			    "block_group >= groups_count - "
 			    "block_group = %d, groups_count = %lu",
-			     block_group, sb->u.ext2_sb.s_groups_count);
-	if (sb->u.ext2_sb.s_loaded_inode_bitmaps > 0 &&
-	    sb->u.ext2_sb.s_inode_bitmap_number[0] == block_group &&
-	    sb->u.ext2_sb.s_inode_bitmap[0] != NULL)
-		return 0;
-	if (sb->u.ext2_sb.s_groups_count <= EXT2_MAX_GROUP_LOADED) {
-		if (sb->u.ext2_sb.s_inode_bitmap[block_group]) {
-			if (sb->u.ext2_sb.s_inode_bitmap_number[block_group] != block_group)
-				ext2_panic (sb, "load_inode_bitmap",
-					    "block_group != inode_bitmap_number");
-			else
-				return block_group;
-		} else {
-			retval = read_inode_bitmap (sb, block_group,
-						    block_group);
-			if (retval < 0)
-				return retval;
-			return block_group;
-		}
+			     block_group, sbi->s_groups_count);
+
+	if (sbi->s_loaded_inode_bitmaps > 0 &&
+	    sbi->s_inode_bitmap_number[0] == block_group && bh)
+		goto found;
+
+	if (sbi->s_groups_count <= EXT2_MAX_GROUP_LOADED) {
+		slot = block_group;
+		bh = sbi->s_inode_bitmap[slot];
+		if (!bh)
+			goto read_it;
+		if (sbi->s_inode_bitmap_number[slot] == slot)
+			goto found;
+		ext2_panic (sb, "load_inode_bitmap",
+			    "block_group != inode_bitmap_number");
 	}
 
-	for (i = 0; i < sb->u.ext2_sb.s_loaded_inode_bitmaps &&
-		    sb->u.ext2_sb.s_inode_bitmap_number[i] != block_group;
+	bh = NULL;
+	for (i = 0; i < sbi->s_loaded_inode_bitmaps &&
+		    sbi->s_inode_bitmap_number[i] != block_group;
 	     i++)
 		;
-	if (i < sb->u.ext2_sb.s_loaded_inode_bitmaps &&
-  	    sb->u.ext2_sb.s_inode_bitmap_number[i] == block_group) {
-		inode_bitmap_number = sb->u.ext2_sb.s_inode_bitmap_number[i];
-		inode_bitmap = sb->u.ext2_sb.s_inode_bitmap[i];
-		for (j = i; j > 0; j--) {
-			sb->u.ext2_sb.s_inode_bitmap_number[j] =
-				sb->u.ext2_sb.s_inode_bitmap_number[j - 1];
-			sb->u.ext2_sb.s_inode_bitmap[j] =
-				sb->u.ext2_sb.s_inode_bitmap[j - 1];
-		}
-		sb->u.ext2_sb.s_inode_bitmap_number[0] = inode_bitmap_number;
-		sb->u.ext2_sb.s_inode_bitmap[0] = inode_bitmap;
-
-		/*
-		 * There's still one special case here --- if inode_bitmap == 0
-		 * then our last attempt to read the bitmap failed and we have
-		 * just ended up caching that failure.  Try again to read it.
-		 */
-		if (!inode_bitmap)
-			retval = read_inode_bitmap (sb, block_group, 0);
-		
-	} else {
-		if (sb->u.ext2_sb.s_loaded_inode_bitmaps < EXT2_MAX_GROUP_LOADED)
-			sb->u.ext2_sb.s_loaded_inode_bitmaps++;
-		else
-			brelse (sb->u.ext2_sb.s_inode_bitmap[EXT2_MAX_GROUP_LOADED - 1]);
-		for (j = sb->u.ext2_sb.s_loaded_inode_bitmaps - 1; j > 0; j--) {
-			sb->u.ext2_sb.s_inode_bitmap_number[j] =
-				sb->u.ext2_sb.s_inode_bitmap_number[j - 1];
-			sb->u.ext2_sb.s_inode_bitmap[j] =
-				sb->u.ext2_sb.s_inode_bitmap[j - 1];
-		}
-		retval = read_inode_bitmap (sb, block_group, 0);
-	}
-	return retval;
+	if (i < sbi->s_loaded_inode_bitmaps)
+		bh = sbi->s_inode_bitmap[i];
+	else if (sbi->s_loaded_inode_bitmaps < EXT2_MAX_GROUP_LOADED)
+		sbi->s_loaded_inode_bitmaps++;
+	else
+		brelse (sbi->s_inode_bitmap[--i]);
+
+	while (i--) {
+		sbi->s_inode_bitmap_number[i+1] = sbi->s_inode_bitmap_number[i];
+		sbi->s_inode_bitmap[i+1] = sbi->s_inode_bitmap[i];
+	}
+
+read_it:
+	if (!bh)
+		bh = read_inode_bitmap (sb, block_group);
+	sbi->s_inode_bitmap_number[slot] = block_group;
+	sbi->s_inode_bitmap[slot] = bh;
+	if (!bh)
+		return ERR_PTR(-EIO);
+found:
+	return bh;
 }
 
 /*
@@ -183,8 +156,7 @@
 	struct buffer_head * bh2;
 	unsigned long block_group;
 	unsigned long bit;
-	int bitmap_nr;
-	struct ext2_group_desc * gdp;
+	struct ext2_group_desc * desc;
 	struct ext2_super_block * es;
 
 	ino = inode->i_ino;
@@ -215,24 +187,22 @@
 	}
 	block_group = (ino - 1) / EXT2_INODES_PER_GROUP(sb);
 	bit = (ino - 1) % EXT2_INODES_PER_GROUP(sb);
-	bitmap_nr = load_inode_bitmap (sb, block_group);
-	if (bitmap_nr < 0)
+	bh = load_inode_bitmap (sb, block_group);
+	if (IS_ERR(bh))
 		goto error_return;
 
-	bh = sb->u.ext2_sb.s_inode_bitmap[bitmap_nr];
-
 	/* Ok, now we can actually update the inode bitmaps.. */
 	if (!ext2_clear_bit (bit, bh->b_data))
 		ext2_error (sb, "ext2_free_inode",
 			      "bit already cleared for inode %lu", ino);
 	else {
-		gdp = ext2_get_group_desc (sb, block_group, &bh2);
-		if (gdp) {
-			gdp->bg_free_inodes_count =
-				cpu_to_le16(le16_to_cpu(gdp->bg_free_inodes_count) + 1);
+		desc = ext2_get_group_desc (sb, block_group, &bh2);
+		if (desc) {
+			desc->bg_free_inodes_count =
+				cpu_to_le16(le16_to_cpu(desc->bg_free_inodes_count) + 1);
 			if (is_directory)
-				gdp->bg_used_dirs_count =
-					cpu_to_le16(le16_to_cpu(gdp->bg_used_dirs_count) - 1);
+				desc->bg_used_dirs_count =
+					cpu_to_le16(le16_to_cpu(desc->bg_used_dirs_count) - 1);
 		}
 		mark_buffer_dirty(bh2);
 		es->s_free_inodes_count =
@@ -259,23 +229,101 @@
  * For other inodes, search forward from the parent directory\'s block
  * group to find a free inode.
  */
+
+static int find_group_dir(struct super_block *sb, int parent_group)
+{
+	struct ext2_super_block * es = sb->u.ext2_sb.s_es;
+	int ngroups = sb->u.ext2_sb.s_groups_count;
+	int avefreei = le32_to_cpu(es->s_free_inodes_count) / ngroups;
+	struct ext2_group_desc *desc, *best_desc = NULL;
+	struct buffer_head *bh, *best_bh = NULL;
+	int group, best_group = -1;
+
+	for (group = 0; group < ngroups; group++) {
+		desc = ext2_get_group_desc (sb, group, &bh);
+		if (!desc || !desc->bg_free_inodes_count)
+			continue;
+		if (le16_to_cpu(desc->bg_free_inodes_count) < avefreei)
+			continue;
+		if (!best_desc || 
+		    (le16_to_cpu(desc->bg_free_blocks_count) >
+		     le16_to_cpu(best_desc->bg_free_blocks_count))) {
+			best_group = group;
+			best_desc = desc;
+			best_bh = bh;
+		}
+	}
+	if (!best_desc)
+		return -1;
+	best_desc->bg_free_inodes_count =
+		cpu_to_le16(le16_to_cpu(best_desc->bg_free_inodes_count) - 1);
+	best_desc->bg_used_dirs_count =
+		cpu_to_le16(le16_to_cpu(best_desc->bg_used_dirs_count) + 1);
+	mark_buffer_dirty(best_bh);
+	return best_group;
+}
+
+static int find_group_other(struct super_block *sb, int parent_group)
+{
+	int ngroups = sb->u.ext2_sb.s_groups_count;
+	struct ext2_group_desc *desc;
+	struct buffer_head *bh;
+	int group, i;
+
+	/*
+	 * Try to place the inode in its parent directory
+	 */
+	group = parent_group;
+	desc = ext2_get_group_desc (sb, group, &bh);
+	if (desc && le16_to_cpu(desc->bg_free_inodes_count))
+		goto found;
+
+	/*
+	 * Use a quadratic hash to find a group with a
+	 * free inode
+	 */
+	for (i = 1; i < ngroups; i <<= 1) {
+		group += i;
+		if (group >= ngroups)
+			group -= ngroups;
+		desc = ext2_get_group_desc (sb, group, &bh);
+		if (desc && le16_to_cpu(desc->bg_free_inodes_count))
+			goto found;
+	}
+
+	/*
+	 * That failed: try linear search for a free inode
+	 */
+	group = parent_group + 1;
+	for (i = 2; i < ngroups; i++) {
+		if (++group >= ngroups)
+			group = 0;
+		desc = ext2_get_group_desc (sb, group, &bh);
+		if (desc && le16_to_cpu(desc->bg_free_inodes_count))
+			goto found;
+	}
+
+	return -1;
+
+found:
+	desc->bg_free_inodes_count =
+		cpu_to_le16(le16_to_cpu(desc->bg_free_inodes_count) - 1);
+	mark_buffer_dirty(bh);
+	return group;
+}
+
 struct inode * ext2_new_inode (const struct inode * dir, int mode)
 {
 	struct super_block * sb;
 	struct buffer_head * bh;
 	struct buffer_head * bh2;
-	int i, j, avefreei;
+	int group, i;
+	ino_t ino;
 	struct inode * inode;
-	int bitmap_nr;
-	struct ext2_group_desc * gdp;
-	struct ext2_group_desc * tmp;
+	struct ext2_group_desc * desc;
 	struct ext2_super_block * es;
 	int err;
 
-	/* Cannot create files in a deleted directory */
-	if (!dir || !dir->i_nlink)
-		return ERR_PTR(-EPERM);
-
 	sb = dir->i_sb;
 	inode = new_inode(sb);
 	if (!inode)
@@ -284,138 +332,41 @@
 	lock_super (sb);
 	es = sb->u.ext2_sb.s_es;
 repeat:
-	gdp = NULL; i=0;
-	
-	if (S_ISDIR(mode)) {
-		avefreei = le32_to_cpu(es->s_free_inodes_count) /
-			sb->u.ext2_sb.s_groups_count;
-/* I am not yet convinced that this next bit is necessary.
-		i = dir->u.ext2_i.i_block_group;
-		for (j = 0; j < sb->u.ext2_sb.s_groups_count; j++) {
-			tmp = ext2_get_group_desc (sb, i, &bh2);
-			if (tmp &&
-			    (le16_to_cpu(tmp->bg_used_dirs_count) << 8) < 
-			     le16_to_cpu(tmp->bg_free_inodes_count)) {
-				gdp = tmp;
-				break;
-			}
-			else
-			i = ++i % sb->u.ext2_sb.s_groups_count;
-		}
-*/
-		if (!gdp) {
-			for (j = 0; j < sb->u.ext2_sb.s_groups_count; j++) {
-				tmp = ext2_get_group_desc (sb, j, &bh2);
-				if (tmp &&
-				    le16_to_cpu(tmp->bg_free_inodes_count) &&
-				    le16_to_cpu(tmp->bg_free_inodes_count) >= avefreei) {
-					if (!gdp || 
-					    (le16_to_cpu(tmp->bg_free_blocks_count) >
-					     le16_to_cpu(gdp->bg_free_blocks_count))) {
-						i = j;
-						gdp = tmp;
-					}
-				}
-			}
-		}
-	}
+	if (S_ISDIR(mode))
+		group = find_group_dir(sb, dir->u.ext2_i.i_block_group);
 	else 
-	{
-		/*
-		 * Try to place the inode in its parent directory
-		 */
-		i = dir->u.ext2_i.i_block_group;
-		tmp = ext2_get_group_desc (sb, i, &bh2);
-		if (tmp && le16_to_cpu(tmp->bg_free_inodes_count))
-			gdp = tmp;
-		else
-		{
-			/*
-			 * Use a quadratic hash to find a group with a
-			 * free inode
-			 */
-			for (j = 1; j < sb->u.ext2_sb.s_groups_count; j <<= 1) {
-				i += j;
-				if (i >= sb->u.ext2_sb.s_groups_count)
-					i -= sb->u.ext2_sb.s_groups_count;
-				tmp = ext2_get_group_desc (sb, i, &bh2);
-				if (tmp &&
-				    le16_to_cpu(tmp->bg_free_inodes_count)) {
-					gdp = tmp;
-					break;
-				}
-			}
-		}
-		if (!gdp) {
-			/*
-			 * That failed: try linear search for a free inode
-			 */
-			i = dir->u.ext2_i.i_block_group + 1;
-			for (j = 2; j < sb->u.ext2_sb.s_groups_count; j++) {
-				if (++i >= sb->u.ext2_sb.s_groups_count)
-					i = 0;
-				tmp = ext2_get_group_desc (sb, i, &bh2);
-				if (tmp &&
-				    le16_to_cpu(tmp->bg_free_inodes_count)) {
-					gdp = tmp;
-					break;
-				}
-			}
-		}
-	}
+		group = find_group_other(sb, dir->u.ext2_i.i_block_group);
 
 	err = -ENOSPC;
-	if (!gdp)
+	if (group == -1)
 		goto fail;
 
 	err = -EIO;
-	bitmap_nr = load_inode_bitmap (sb, i);
-	if (bitmap_nr < 0)
-		goto fail;
-
-	bh = sb->u.ext2_sb.s_inode_bitmap[bitmap_nr];
-	if ((j = ext2_find_first_zero_bit ((unsigned long *) bh->b_data,
-				      EXT2_INODES_PER_GROUP(sb))) <
-	    EXT2_INODES_PER_GROUP(sb)) {
-		if (ext2_set_bit (j, bh->b_data)) {
-			ext2_error (sb, "ext2_new_inode",
-				      "bit already set for inode %d", j);
-			goto repeat;
-		}
-		mark_buffer_dirty(bh);
-		if (sb->s_flags & MS_SYNCHRONOUS) {
-			ll_rw_block (WRITE, 1, &bh);
-			wait_on_buffer (bh);
-		}
-	} else {
-		if (le16_to_cpu(gdp->bg_free_inodes_count) != 0) {
-			ext2_error (sb, "ext2_new_inode",
-				    "Free inodes count corrupted in group %d",
-				    i);
-			/* Is it really ENOSPC? */
-			err = -ENOSPC;
-			if (sb->s_flags & MS_RDONLY)
-				goto fail;
+	bh = load_inode_bitmap (sb, group);
+	if (IS_ERR(bh))
+		goto fail2;
+
+	i = ext2_find_first_zero_bit ((unsigned long *) bh->b_data,
+				      EXT2_INODES_PER_GROUP(sb));
+	if (i >= EXT2_INODES_PER_GROUP(sb))
+		goto bad_count;
+	ext2_set_bit (i, bh->b_data);
 
-			gdp->bg_free_inodes_count = 0;
-			mark_buffer_dirty(bh2);
-		}
-		goto repeat;
+	mark_buffer_dirty(bh);
+	if (sb->s_flags & MS_SYNCHRONOUS) {
+		ll_rw_block (WRITE, 1, &bh);
+		wait_on_buffer (bh);
 	}
-	j += i * EXT2_INODES_PER_GROUP(sb) + 1;
-	if (j < EXT2_FIRST_INO(sb) || j > le32_to_cpu(es->s_inodes_count)) {
+
+	ino = group * EXT2_INODES_PER_GROUP(sb) + i + 1;
+	if (ino < EXT2_FIRST_INO(sb) || ino > le32_to_cpu(es->s_inodes_count)) {
 		ext2_error (sb, "ext2_new_inode",
 			    "reserved inode or inode > inodes count - "
-			    "block_group = %d,inode=%d", i, j);
+			    "block_group = %d,inode=%ld", group, ino);
 		err = -EIO;
-		goto fail;
+		goto fail2;
 	}
-	gdp->bg_free_inodes_count =
-		cpu_to_le16(le16_to_cpu(gdp->bg_free_inodes_count) - 1);
-	if (S_ISDIR(mode))
-		gdp->bg_used_dirs_count =
-			cpu_to_le16(le16_to_cpu(gdp->bg_used_dirs_count) + 1);
-	mark_buffer_dirty(bh2);
+
 	es->s_free_inodes_count =
 		cpu_to_le32(le32_to_cpu(es->s_free_inodes_count) - 1);
 	mark_buffer_dirty(sb->u.ext2_sb.s_sbh);
@@ -431,22 +382,15 @@
 		inode->i_gid = current->fsgid;
 	inode->i_mode = mode;
 
-	inode->i_ino = j;
+	inode->i_ino = ino;
 	inode->i_blksize = PAGE_SIZE;	/* This is the optimal IO size (for stat), not the fs block size */
 	inode->i_blocks = 0;
 	inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
 	inode->u.ext2_i.i_new_inode = 1;
 	inode->u.ext2_i.i_flags = dir->u.ext2_i.i_flags;
 	if (S_ISLNK(mode))
-		inode->u.ext2_i.i_flags &= ~(EXT2_IMMUTABLE_FL | EXT2_APPEND_FL);
-	inode->u.ext2_i.i_faddr = 0;
-	inode->u.ext2_i.i_frag_no = 0;
-	inode->u.ext2_i.i_frag_size = 0;
-	inode->u.ext2_i.i_file_acl = 0;
-	inode->u.ext2_i.i_dir_acl = 0;
-	inode->u.ext2_i.i_dtime = 0;
-	inode->u.ext2_i.i_prealloc_count = 0;
-	inode->u.ext2_i.i_block_group = i;
+		inode->u.ext2_i.i_flags &= ~(EXT2_IMMUTABLE_FL|EXT2_APPEND_FL);
+	inode->u.ext2_i.i_block_group = group;
 	if (inode->u.ext2_i.i_flags & EXT2_SYNC_FL)
 		inode->i_flags |= S_SYNC;
 	insert_inode_hash(inode);
@@ -464,40 +408,59 @@
 	ext2_debug ("allocating inode %lu\n", inode->i_ino);
 	return inode;
 
+fail2:
+	desc = ext2_get_group_desc (sb, group, &bh2);
+	desc->bg_free_inodes_count =
+		cpu_to_le16(le16_to_cpu(desc->bg_free_inodes_count) + 1);
+	if (S_ISDIR(mode))
+		desc->bg_used_dirs_count =
+			cpu_to_le16(le16_to_cpu(desc->bg_used_dirs_count) - 1);
+	mark_buffer_dirty(bh2);
 fail:
 	unlock_super(sb);
 	make_bad_inode(inode);
 	iput(inode);
 	return ERR_PTR(err);
+
+bad_count:
+	ext2_error (sb, "ext2_new_inode",
+		    "Free inodes count corrupted in group %d",
+		    group);
+	/* Is it really ENOSPC? */
+	err = -ENOSPC;
+	if (sb->s_flags & MS_RDONLY)
+		goto fail;
+
+	desc = ext2_get_group_desc (sb, group, &bh2);
+	desc->bg_free_inodes_count = 0;
+	mark_buffer_dirty(bh2);
+	goto repeat;
 }
 
 unsigned long ext2_count_free_inodes (struct super_block * sb)
 {
 #ifdef EXT2FS_DEBUG
 	struct ext2_super_block * es;
-	unsigned long desc_count, bitmap_count, x;
-	int bitmap_nr;
-	struct ext2_group_desc * gdp;
+	unsigned long desc_count = 0, bitmap_count = 0;
 	int i;
 
 	lock_super (sb);
 	es = sb->u.ext2_sb.s_es;
-	desc_count = 0;
-	bitmap_count = 0;
-	gdp = NULL;
 	for (i = 0; i < sb->u.ext2_sb.s_groups_count; i++) {
-		gdp = ext2_get_group_desc (sb, i, NULL);
-		if (!gdp)
+		struct ext2_group_desc *desc = ext2_get_group_desc (sb, i, NULL);
+		struct buffer_head *bh;
+		unsigned x;
+
+		if (!desc)
 			continue;
-		desc_count += le16_to_cpu(gdp->bg_free_inodes_count);
-		bitmap_nr = load_inode_bitmap (sb, i);
-		if (bitmap_nr < 0)
+		desc_count += le16_to_cpu(desc->bg_free_inodes_count);
+		bh = load_inode_bitmap (sb, i);
+		if (IS_ERR(bh))
 			continue;
 
-		x = ext2_count_free (sb->u.ext2_sb.s_inode_bitmap[bitmap_nr],
-				     EXT2_INODES_PER_GROUP(sb) / 8);
+		x = ext2_count_free (bh, EXT2_INODES_PER_GROUP(sb) / 8);
 		printk ("group %d: stored = %d, counted = %lu\n",
-			i, le16_to_cpu(gdp->bg_free_inodes_count), x);
+			i, le16_to_cpu(desc->bg_free_inodes_count), x);
 		bitmap_count += x;
 	}
 	printk("ext2_count_free_inodes: stored = %lu, computed = %lu, %lu\n",
@@ -513,39 +476,35 @@
 /* Called at mount-time, super-block is locked */
 void ext2_check_inodes_bitmap (struct super_block * sb)
 {
-	struct ext2_super_block * es;
-	unsigned long desc_count, bitmap_count, x;
-	int bitmap_nr;
-	struct ext2_group_desc * gdp;
+	struct ext2_super_block * es = sb->u.ext2_sb.s_es;
+	unsigned long desc_count = 0, bitmap_count = 0;
 	int i;
 
-	es = sb->u.ext2_sb.s_es;
-	desc_count = 0;
-	bitmap_count = 0;
-	gdp = NULL;
 	for (i = 0; i < sb->u.ext2_sb.s_groups_count; i++) {
-		gdp = ext2_get_group_desc (sb, i, NULL);
-		if (!gdp)
+		struct ext2_group_desc *desc = ext2_get_group_desc(sb, i, NULL);
+		struct buffer_head *bh;
+		unsigned x;
+
+		if (!desc)
 			continue;
-		desc_count += le16_to_cpu(gdp->bg_free_inodes_count);
-		bitmap_nr = load_inode_bitmap (sb, i);
-		if (bitmap_nr < 0)
+		desc_count += le16_to_cpu(desc->bg_free_inodes_count);
+		bh = load_inode_bitmap (sb, i);
+		if (IS_ERR(bh))
 			continue;
 		
-		x = ext2_count_free (sb->u.ext2_sb.s_inode_bitmap[bitmap_nr],
-				     EXT2_INODES_PER_GROUP(sb) / 8);
-		if (le16_to_cpu(gdp->bg_free_inodes_count) != x)
+		x = ext2_count_free (bh, EXT2_INODES_PER_GROUP(sb) / 8);
+		if (le16_to_cpu(desc->bg_free_inodes_count) != x)
 			ext2_error (sb, "ext2_check_inodes_bitmap",
 				    "Wrong free inodes count in group %d, "
 				    "stored = %d, counted = %lu", i,
-				    le16_to_cpu(gdp->bg_free_inodes_count), x);
+				    le16_to_cpu(desc->bg_free_inodes_count), x);
 		bitmap_count += x;
 	}
 	if (le32_to_cpu(es->s_free_inodes_count) != bitmap_count)
 		ext2_error (sb, "ext2_check_inodes_bitmap",
 			    "Wrong free inodes count in super block, "
 			    "stored = %lu, counted = %lu",
-			    (unsigned long) le32_to_cpu(es->s_free_inodes_count),
+			    (unsigned long)le32_to_cpu(es->s_free_inodes_count),
 			    bitmap_count);
 }
 #endif