Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 699 insertions, 0 deletions

diff --git a/fs/ext2/balloc.c b/fs/ext2/balloc.c
new file mode 100644
index 000000000000..6591abef64d0
--- /dev/null
+++ b/fs/ext2/balloc.c
@@ -0,0 +1,699 @@
+/*
+ *  linux/fs/ext2/balloc.c
+ *
+ * Copyright (C) 1992, 1993, 1994, 1995
+ * Remy Card (card@masi.ibp.fr)
+ * Laboratoire MASI - Institut Blaise Pascal
+ * Universite Pierre et Marie Curie (Paris VI)
+ *
+ *  Enhanced block allocation by Stephen Tweedie (sct@redhat.com), 1993
+ *  Big-endian to little-endian byte-swapping/bitmaps by
+ *        David S. Miller (davem@caip.rutgers.edu), 1995
+ */
+
+#include <linux/config.h>
+#include "ext2.h"
+#include <linux/quotaops.h>
+#include <linux/sched.h>
+#include <linux/buffer_head.h>
+
+/*
+ * balloc.c contains the blocks allocation and deallocation routines
+ */
+
+/*
+ * The free blocks are managed by bitmaps.  A file system contains several
+ * blocks groups.  Each group contains 1 bitmap block for blocks, 1 bitmap
+ * block for inodes, N blocks for the inode table and data blocks.
+ *
+ * The file system contains group descriptors which are located after the
+ * super block.  Each descriptor contains the number of the bitmap block and
+ * the free blocks count in the block.  The descriptors are loaded in memory
+ * when a file system is mounted (see ext2_read_super).
+ */
+
+
+#define in_range(b, first, len)	((b) >= (first) && (b) <= (first) + (len) - 1)
+
+struct ext2_group_desc * ext2_get_group_desc(struct super_block * sb,
+					     unsigned int block_group,
+					     struct buffer_head ** bh)
+{
+	unsigned long group_desc;
+	unsigned long offset;
+	struct ext2_group_desc * desc;
+	struct ext2_sb_info *sbi = EXT2_SB(sb);
+
+	if (block_group >= sbi->s_groups_count) {
+		ext2_error (sb, "ext2_get_group_desc",
+			    "block_group >= groups_count - "
+			    "block_group = %d, groups_count = %lu",
+			    block_group, sbi->s_groups_count);
+
+		return NULL;
+	}
+
+	group_desc = block_group >> EXT2_DESC_PER_BLOCK_BITS(sb);
+	offset = block_group & (EXT2_DESC_PER_BLOCK(sb) - 1);
+	if (!sbi->s_group_desc[group_desc]) {
+		ext2_error (sb, "ext2_get_group_desc",
+			    "Group descriptor not loaded - "
+			    "block_group = %d, group_desc = %lu, desc = %lu",
+			     block_group, group_desc, offset);
+		return NULL;
+	}
+
+	desc = (struct ext2_group_desc *) sbi->s_group_desc[group_desc]->b_data;
+	if (bh)
+		*bh = sbi->s_group_desc[group_desc];
+	return desc + offset;
+}
+
+/*
+ * Read the bitmap for a given block_group, reading into the specified 
+ * slot in the superblock's bitmap cache.
+ *
+ * Return buffer_head on success or NULL in case of failure.
+ */
+static struct buffer_head *
+read_block_bitmap(struct super_block *sb, unsigned int block_group)
+{
+	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 = sb_bread(sb, le32_to_cpu(desc->bg_block_bitmap));
+	if (!bh)
+		ext2_error (sb, "read_block_bitmap",
+			    "Cannot read block bitmap - "
+			    "block_group = %d, block_bitmap = %u",
+			    block_group, le32_to_cpu(desc->bg_block_bitmap));
+error_out:
+	return bh;
+}
+
+/*
+ * Set sb->s_dirt here because the superblock was "logically" altered.  We
+ * need to recalculate its free blocks count and flush it out.
+ */
+static int reserve_blocks(struct super_block *sb, int count)
+{
+	struct ext2_sb_info *sbi = EXT2_SB(sb);
+	struct ext2_super_block *es = sbi->s_es;
+	unsigned free_blocks;
+	unsigned root_blocks;
+
+	free_blocks = percpu_counter_read_positive(&sbi->s_freeblocks_counter);
+	root_blocks = le32_to_cpu(es->s_r_blocks_count);
+
+	if (free_blocks < count)
+		count = free_blocks;
+
+	if (free_blocks < root_blocks + count && !capable(CAP_SYS_RESOURCE) &&
+	    sbi->s_resuid != current->fsuid &&
+	    (sbi->s_resgid == 0 || !in_group_p (sbi->s_resgid))) {
+		/*
+		 * We are too close to reserve and we are not privileged.
+		 * Can we allocate anything at all?
+		 */
+		if (free_blocks > root_blocks)
+			count = free_blocks - root_blocks;
+		else
+			return 0;
+	}
+
+	percpu_counter_mod(&sbi->s_freeblocks_counter, -count);
+	sb->s_dirt = 1;
+	return count;
+}
+
+static void release_blocks(struct super_block *sb, int count)
+{
+	if (count) {
+		struct ext2_sb_info *sbi = EXT2_SB(sb);
+
+		percpu_counter_mod(&sbi->s_freeblocks_counter, count);
+		sb->s_dirt = 1;
+	}
+}
+
+static int group_reserve_blocks(struct ext2_sb_info *sbi, int group_no,
+	struct ext2_group_desc *desc, struct buffer_head *bh, int count)
+{
+	unsigned free_blocks;
+
+	if (!desc->bg_free_blocks_count)
+		return 0;
+
+	spin_lock(sb_bgl_lock(sbi, group_no));
+	free_blocks = le16_to_cpu(desc->bg_free_blocks_count);
+	if (free_blocks < count)
+		count = free_blocks;
+	desc->bg_free_blocks_count = cpu_to_le16(free_blocks - count);
+	spin_unlock(sb_bgl_lock(sbi, group_no));
+	mark_buffer_dirty(bh);
+	return count;
+}
+
+static void group_release_blocks(struct super_block *sb, int group_no,
+	struct ext2_group_desc *desc, struct buffer_head *bh, int count)
+{
+	if (count) {
+		struct ext2_sb_info *sbi = EXT2_SB(sb);
+		unsigned free_blocks;
+
+		spin_lock(sb_bgl_lock(sbi, group_no));
+		free_blocks = le16_to_cpu(desc->bg_free_blocks_count);
+		desc->bg_free_blocks_count = cpu_to_le16(free_blocks + count);
+		spin_unlock(sb_bgl_lock(sbi, group_no));
+		sb->s_dirt = 1;
+		mark_buffer_dirty(bh);
+	}
+}
+
+/* Free given blocks, update quota and i_blocks field */
+void ext2_free_blocks (struct inode * inode, unsigned long block,
+		       unsigned long count)
+{
+	struct buffer_head *bitmap_bh = NULL;
+	struct buffer_head * bh2;
+	unsigned long block_group;
+	unsigned long bit;
+	unsigned long i;
+	unsigned long overflow;
+	struct super_block * sb = inode->i_sb;
+	struct ext2_sb_info * sbi = EXT2_SB(sb);
+	struct ext2_group_desc * desc;
+	struct ext2_super_block * es = sbi->s_es;
+	unsigned freed = 0, group_freed;
+
+	if (block < le32_to_cpu(es->s_first_data_block) ||
+	    block + count < block ||
+	    block + count > le32_to_cpu(es->s_blocks_count)) {
+		ext2_error (sb, "ext2_free_blocks",
+			    "Freeing blocks not in datazone - "
+			    "block = %lu, count = %lu", block, count);
+		goto error_return;
+	}
+
+	ext2_debug ("freeing block(s) %lu-%lu\n", block, block + count - 1);
+
+do_more:
+	overflow = 0;
+	block_group = (block - le32_to_cpu(es->s_first_data_block)) /
+		      EXT2_BLOCKS_PER_GROUP(sb);
+	bit = (block - le32_to_cpu(es->s_first_data_block)) %
+		      EXT2_BLOCKS_PER_GROUP(sb);
+	/*
+	 * Check to see if we are freeing blocks across a group
+	 * boundary.
+	 */
+	if (bit + count > EXT2_BLOCKS_PER_GROUP(sb)) {
+		overflow = bit + count - EXT2_BLOCKS_PER_GROUP(sb);
+		count -= overflow;
+	}
+	brelse(bitmap_bh);
+	bitmap_bh = read_block_bitmap(sb, block_group);
+	if (!bitmap_bh)
+		goto error_return;
+
+	desc = ext2_get_group_desc (sb, block_group, &bh2);
+	if (!desc)
+		goto error_return;
+
+	if (in_range (le32_to_cpu(desc->bg_block_bitmap), block, count) ||
+	    in_range (le32_to_cpu(desc->bg_inode_bitmap), block, count) ||
+	    in_range (block, le32_to_cpu(desc->bg_inode_table),
+		      sbi->s_itb_per_group) ||
+	    in_range (block + count - 1, le32_to_cpu(desc->bg_inode_table),
+		      sbi->s_itb_per_group))
+		ext2_error (sb, "ext2_free_blocks",
+			    "Freeing blocks in system zones - "
+			    "Block = %lu, count = %lu",
+			    block, count);
+
+	for (i = 0, group_freed = 0; i < count; i++) {
+		if (!ext2_clear_bit_atomic(sb_bgl_lock(sbi, block_group),
+						bit + i, bitmap_bh->b_data)) {
+			ext2_error(sb, __FUNCTION__,
+				"bit already cleared for block %lu", block + i);
+		} else {
+			group_freed++;
+		}
+	}
+
+	mark_buffer_dirty(bitmap_bh);
+	if (sb->s_flags & MS_SYNCHRONOUS)
+		sync_dirty_buffer(bitmap_bh);
+
+	group_release_blocks(sb, block_group, desc, bh2, group_freed);
+	freed += group_freed;
+
+	if (overflow) {
+		block += count;
+		count = overflow;
+		goto do_more;
+	}
+error_return:
+	brelse(bitmap_bh);
+	release_blocks(sb, freed);
+	DQUOT_FREE_BLOCK(inode, freed);
+}
+
+static int grab_block(spinlock_t *lock, char *map, unsigned size, int goal)
+{
+	int k;
+	char *p, *r;
+
+	if (!ext2_test_bit(goal, map))
+		goto got_it;
+
+repeat:
+	if (goal) {
+		/*
+		 * The goal was occupied; search forward for a free 
+		 * block within the next XX blocks.
+		 *
+		 * end_goal is more or less random, but it has to be
+		 * less than EXT2_BLOCKS_PER_GROUP. Aligning up to the
+		 * next 64-bit boundary is simple..
+		 */
+		k = (goal + 63) & ~63;
+		goal = ext2_find_next_zero_bit(map, k, goal);
+		if (goal < k)
+			goto got_it;
+		/*
+		 * Search in the remainder of the current group.
+		 */
+	}
+
+	p = map + (goal >> 3);
+	r = memscan(p, 0, (size - goal + 7) >> 3);
+	k = (r - map) << 3;
+	if (k < size) {
+		/* 
+		 * We have succeeded in finding a free byte in the block
+		 * bitmap.  Now search backwards to find the start of this
+		 * group of free blocks - won't take more than 7 iterations.
+		 */
+		for (goal = k; goal && !ext2_test_bit (goal - 1, map); goal--)
+			;
+		goto got_it;
+	}
+
+	k = ext2_find_next_zero_bit ((u32 *)map, size, goal);
+	if (k < size) {
+		goal = k;
+		goto got_it;
+	}
+	return -1;
+got_it:
+	if (ext2_set_bit_atomic(lock, goal, (void *) map)) 
+		goto repeat;	
+	return goal;
+}
+
+/*
+ * ext2_new_block uses a goal block to assist allocation.  If the goal is
+ * free, or there is a free block within 32 blocks of the goal, that block
+ * is allocated.  Otherwise a forward search is made for a free block; within 
+ * each block group the search first looks for an entire free byte in the block
+ * bitmap, and then for any free bit if that fails.
+ * This function also updates quota and i_blocks field.
+ */
+int ext2_new_block(struct inode *inode, unsigned long goal,
+			u32 *prealloc_count, u32 *prealloc_block, int *err)
+{
+	struct buffer_head *bitmap_bh = NULL;
+	struct buffer_head *gdp_bh;	/* bh2 */
+	struct ext2_group_desc *desc;
+	int group_no;			/* i */
+	int ret_block;			/* j */
+	int group_idx;			/* k */
+	int target_block;		/* tmp */
+	int block = 0;
+	struct super_block *sb = inode->i_sb;
+	struct ext2_sb_info *sbi = EXT2_SB(sb);
+	struct ext2_super_block *es = sbi->s_es;
+	unsigned group_size = EXT2_BLOCKS_PER_GROUP(sb);
+	unsigned prealloc_goal = es->s_prealloc_blocks;
+	unsigned group_alloc = 0, es_alloc, dq_alloc;
+	int nr_scanned_groups;
+
+	if (!prealloc_goal--)
+		prealloc_goal = EXT2_DEFAULT_PREALLOC_BLOCKS - 1;
+	if (!prealloc_count || *prealloc_count)
+		prealloc_goal = 0;
+
+	if (DQUOT_ALLOC_BLOCK(inode, 1)) {
+		*err = -EDQUOT;
+		goto out;
+	}
+
+	while (prealloc_goal && DQUOT_PREALLOC_BLOCK(inode, prealloc_goal))
+		prealloc_goal--;
+
+	dq_alloc = prealloc_goal + 1;
+	es_alloc = reserve_blocks(sb, dq_alloc);
+	if (!es_alloc) {
+		*err = -ENOSPC;
+		goto out_dquot;
+	}
+
+	ext2_debug ("goal=%lu.\n", goal);
+
+	if (goal < le32_to_cpu(es->s_first_data_block) ||
+	    goal >= le32_to_cpu(es->s_blocks_count))
+		goal = le32_to_cpu(es->s_first_data_block);
+	group_no = (goal - le32_to_cpu(es->s_first_data_block)) / group_size;
+	desc = ext2_get_group_desc (sb, group_no, &gdp_bh);
+	if (!desc) {
+		/*
+		 * gdp_bh may still be uninitialised.  But group_release_blocks
+		 * will not touch it because group_alloc is zero.
+		 */
+		goto io_error;
+	}
+
+	group_alloc = group_reserve_blocks(sbi, group_no, desc,
+					gdp_bh, es_alloc);
+	if (group_alloc) {
+		ret_block = ((goal - le32_to_cpu(es->s_first_data_block)) %
+					group_size);
+		brelse(bitmap_bh);
+		bitmap_bh = read_block_bitmap(sb, group_no);
+		if (!bitmap_bh)
+			goto io_error;
+		
+		ext2_debug("goal is at %d:%d.\n", group_no, ret_block);
+
+		ret_block = grab_block(sb_bgl_lock(sbi, group_no),
+				bitmap_bh->b_data, group_size, ret_block);
+		if (ret_block >= 0)
+			goto got_block;
+		group_release_blocks(sb, group_no, desc, gdp_bh, group_alloc);
+		group_alloc = 0;
+	}
+
+	ext2_debug ("Bit not found in block group %d.\n", group_no);
+
+	/*
+	 * Now search the rest of the groups.  We assume that 
+	 * i and desc correctly point to the last group visited.
+	 */
+	nr_scanned_groups = 0;
+retry:
+	for (group_idx = 0; !group_alloc &&
+			group_idx < sbi->s_groups_count; group_idx++) {
+		group_no++;
+		if (group_no >= sbi->s_groups_count)
+			group_no = 0;
+		desc = ext2_get_group_desc(sb, group_no, &gdp_bh);
+		if (!desc)
+			goto io_error;
+		group_alloc = group_reserve_blocks(sbi, group_no, desc,
+						gdp_bh, es_alloc);
+	}
+	if (!group_alloc) {
+		*err = -ENOSPC;
+		goto out_release;
+	}
+	brelse(bitmap_bh);
+	bitmap_bh = read_block_bitmap(sb, group_no);
+	if (!bitmap_bh)
+		goto io_error;
+
+	ret_block = grab_block(sb_bgl_lock(sbi, group_no), bitmap_bh->b_data,
+				group_size, 0);
+	if (ret_block < 0) {
+		/*
+		 * If a free block counter is corrupted we can loop inifintely.
+		 * Detect that here.
+		 */
+		nr_scanned_groups++;
+		if (nr_scanned_groups > 2 * sbi->s_groups_count) {
+			ext2_error(sb, "ext2_new_block",
+				"corrupted free blocks counters");
+			goto io_error;
+		}
+		/*
+		 * Someone else grabbed the last free block in this blockgroup
+		 * before us.  Retry the scan.
+		 */
+		group_release_blocks(sb, group_no, desc, gdp_bh, group_alloc);
+		group_alloc = 0;
+		goto retry;
+	}
+
+got_block:
+	ext2_debug("using block group %d(%d)\n",
+		group_no, desc->bg_free_blocks_count);
+
+	target_block = ret_block + group_no * group_size +
+			le32_to_cpu(es->s_first_data_block);
+
+	if (target_block == le32_to_cpu(desc->bg_block_bitmap) ||
+	    target_block == le32_to_cpu(desc->bg_inode_bitmap) ||
+	    in_range(target_block, le32_to_cpu(desc->bg_inode_table),
+		      sbi->s_itb_per_group))
+		ext2_error (sb, "ext2_new_block",
+			    "Allocating block in system zone - "
+			    "block = %u", target_block);
+
+	if (target_block >= le32_to_cpu(es->s_blocks_count)) {
+		ext2_error (sb, "ext2_new_block",
+			    "block(%d) >= blocks count(%d) - "
+			    "block_group = %d, es == %p ", ret_block,
+			le32_to_cpu(es->s_blocks_count), group_no, es);
+		goto io_error;
+	}
+	block = target_block;
+
+	/* OK, we _had_ allocated something */
+	ext2_debug("found bit %d\n", ret_block);
+
+	dq_alloc--;
+	es_alloc--;
+	group_alloc--;
+
+	/*
+	 * Do block preallocation now if required.
+	 */
+	write_lock(&EXT2_I(inode)->i_meta_lock);
+	if (group_alloc && !*prealloc_count) {
+		unsigned n;
+
+		for (n = 0; n < group_alloc && ++ret_block < group_size; n++) {
+			if (ext2_set_bit_atomic(sb_bgl_lock(sbi, group_no),
+						ret_block,
+						(void*) bitmap_bh->b_data))
+ 				break;
+		}
+		*prealloc_block = block + 1;
+		*prealloc_count = n;
+		es_alloc -= n;
+		dq_alloc -= n;
+		group_alloc -= n;
+	}
+	write_unlock(&EXT2_I(inode)->i_meta_lock);
+
+	mark_buffer_dirty(bitmap_bh);
+	if (sb->s_flags & MS_SYNCHRONOUS)
+		sync_dirty_buffer(bitmap_bh);
+
+	ext2_debug ("allocating block %d. ", block);
+
+	*err = 0;
+out_release:
+	group_release_blocks(sb, group_no, desc, gdp_bh, group_alloc);
+	release_blocks(sb, es_alloc);
+out_dquot:
+	DQUOT_FREE_BLOCK(inode, dq_alloc);
+out:
+	brelse(bitmap_bh);
+	return block;
+
+io_error:
+	*err = -EIO;
+	goto out_release;
+}
+
+unsigned long ext2_count_free_blocks (struct super_block * sb)
+{
+	struct ext2_group_desc * desc;
+	unsigned long desc_count = 0;
+	int i;
+#ifdef EXT2FS_DEBUG
+	unsigned long bitmap_count, x;
+	struct ext2_super_block *es;
+
+	lock_super (sb);
+	es = EXT2_SB(sb)->s_es;
+	desc_count = 0;
+	bitmap_count = 0;
+	desc = NULL;
+	for (i = 0; i < EXT2_SB(sb)->s_groups_count; i++) {
+		struct buffer_head *bitmap_bh;
+		desc = ext2_get_group_desc (sb, i, NULL);
+		if (!desc)
+			continue;
+		desc_count += le16_to_cpu(desc->bg_free_blocks_count);
+		bitmap_bh = read_block_bitmap(sb, i);
+		if (!bitmap_bh)
+			continue;
+		
+		x = ext2_count_free(bitmap_bh, sb->s_blocksize);
+		printk ("group %d: stored = %d, counted = %lu\n",
+			i, le16_to_cpu(desc->bg_free_blocks_count), x);
+		bitmap_count += x;
+		brelse(bitmap_bh);
+	}
+	printk("ext2_count_free_blocks: stored = %lu, computed = %lu, %lu\n",
+		(long)le32_to_cpu(es->s_free_blocks_count),
+		desc_count, bitmap_count);
+	unlock_super (sb);
+	return bitmap_count;
+#else
+        for (i = 0; i < EXT2_SB(sb)->s_groups_count; i++) {
+                desc = ext2_get_group_desc (sb, i, NULL);
+                if (!desc)
+                        continue;
+                desc_count += le16_to_cpu(desc->bg_free_blocks_count);
+	}
+	return desc_count;
+#endif
+}
+
+static inline int
+block_in_use(unsigned long block, struct super_block *sb, unsigned char *map)
+{
+	return ext2_test_bit ((block -
+		le32_to_cpu(EXT2_SB(sb)->s_es->s_first_data_block)) %
+			 EXT2_BLOCKS_PER_GROUP(sb), map);
+}
+
+static inline int test_root(int a, int b)
+{
+	int num = b;
+
+	while (a > num)
+		num *= b;
+	return num == a;
+}
+
+static int ext2_group_sparse(int group)
+{
+	if (group <= 1)
+		return 1;
+	return (test_root(group, 3) || test_root(group, 5) ||
+		test_root(group, 7));
+}
+
+/**
+ *	ext2_bg_has_super - number of blocks used by the superblock in group
+ *	@sb: superblock for filesystem
+ *	@group: group number to check
+ *
+ *	Return the number of blocks used by the superblock (primary or backup)
+ *	in this group.  Currently this will be only 0 or 1.
+ */
+int ext2_bg_has_super(struct super_block *sb, int group)
+{
+	if (EXT2_HAS_RO_COMPAT_FEATURE(sb,EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER)&&
+	    !ext2_group_sparse(group))
+		return 0;
+	return 1;
+}
+
+/**
+ *	ext2_bg_num_gdb - number of blocks used by the group table in group
+ *	@sb: superblock for filesystem
+ *	@group: group number to check
+ *
+ *	Return the number of blocks used by the group descriptor table
+ *	(primary or backup) in this group.  In the future there may be a
+ *	different number of descriptor blocks in each group.
+ */
+unsigned long ext2_bg_num_gdb(struct super_block *sb, int group)
+{
+	if (EXT2_HAS_RO_COMPAT_FEATURE(sb,EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER)&&
+	    !ext2_group_sparse(group))
+		return 0;
+	return EXT2_SB(sb)->s_gdb_count;
+}
+
+#ifdef CONFIG_EXT2_CHECK
+/* Called at mount-time, super-block is locked */
+void ext2_check_blocks_bitmap (struct super_block * sb)
+{
+	struct buffer_head *bitmap_bh = NULL;
+	struct ext2_super_block * es;
+	unsigned long desc_count, bitmap_count, x, j;
+	unsigned long desc_blocks;
+	struct ext2_group_desc * desc;
+	int i;
+
+	es = EXT2_SB(sb)->s_es;
+	desc_count = 0;
+	bitmap_count = 0;
+	desc = NULL;
+	for (i = 0; i < EXT2_SB(sb)->s_groups_count; i++) {
+		desc = ext2_get_group_desc (sb, i, NULL);
+		if (!desc)
+			continue;
+		desc_count += le16_to_cpu(desc->bg_free_blocks_count);
+		brelse(bitmap_bh);
+		bitmap_bh = read_block_bitmap(sb, i);
+		if (!bitmap_bh)
+			continue;
+
+		if (ext2_bg_has_super(sb, i) &&
+				!ext2_test_bit(0, bitmap_bh->b_data))
+			ext2_error(sb, __FUNCTION__,
+				   "Superblock in group %d is marked free", i);
+
+		desc_blocks = ext2_bg_num_gdb(sb, i);
+		for (j = 0; j < desc_blocks; j++)
+			if (!ext2_test_bit(j + 1, bitmap_bh->b_data))
+				ext2_error(sb, __FUNCTION__,
+					   "Descriptor block #%ld in group "
+					   "%d is marked free", j, i);
+
+		if (!block_in_use(le32_to_cpu(desc->bg_block_bitmap),
+					sb, bitmap_bh->b_data))
+			ext2_error(sb, "ext2_check_blocks_bitmap",
+				    "Block bitmap for group %d is marked free",
+				    i);
+
+		if (!block_in_use(le32_to_cpu(desc->bg_inode_bitmap),
+					sb, bitmap_bh->b_data))
+			ext2_error(sb, "ext2_check_blocks_bitmap",
+				    "Inode bitmap for group %d is marked free",
+				    i);
+
+		for (j = 0; j < EXT2_SB(sb)->s_itb_per_group; j++)
+			if (!block_in_use(le32_to_cpu(desc->bg_inode_table) + j,
+						sb, bitmap_bh->b_data))
+				ext2_error (sb, "ext2_check_blocks_bitmap",
+					    "Block #%ld of the inode table in "
+					    "group %d is marked free", j, i);
+
+		x = ext2_count_free(bitmap_bh, sb->s_blocksize);
+		if (le16_to_cpu(desc->bg_free_blocks_count) != x)
+			ext2_error (sb, "ext2_check_blocks_bitmap",
+				    "Wrong free blocks count for group %d, "
+				    "stored = %d, counted = %lu", i,
+				    le16_to_cpu(desc->bg_free_blocks_count), x);
+		bitmap_count += x;
+	}
+	if (le32_to_cpu(es->s_free_blocks_count) != bitmap_count)
+		ext2_error (sb, "ext2_check_blocks_bitmap",
+			"Wrong free blocks count in super block, "
+			"stored = %lu, counted = %lu",
+			(unsigned long)le32_to_cpu(es->s_free_blocks_count),
+			bitmap_count);
+	brelse(bitmap_bh);
+}
+#endif