patch-2.4.21 linux-2.4.21/fs/ext3/balloc.c

• Lines: 109
• Date: 2003-06-13 07:51:37.000000000 -0700
• Orig file: linux-2.4.20/fs/ext3/balloc.c
• Orig date: 2002-08-02 17:39:45.000000000 -0700

diff -urN linux-2.4.20/fs/ext3/balloc.c linux-2.4.21/fs/ext3/balloc.c
@@ -276,7 +276,8 @@
 	}
 	lock_super (sb);
 	es = sb->u.ext3_sb.s_es;
-	if (block < le32_to_cpu(es->s_first_data_block) || 
+	if (block < le32_to_cpu(es->s_first_data_block) ||
+	    block + count < block ||
 	    (block + count) > le32_to_cpu(es->s_blocks_count)) {
 		ext3_error (sb, "ext3_free_blocks",
 			    "Freeing blocks not in datazone - "
@@ -309,17 +310,6 @@
 	if (!gdp)
 		goto error_return;
 
-	if (in_range (le32_to_cpu(gdp->bg_block_bitmap), block, count) ||
-	    in_range (le32_to_cpu(gdp->bg_inode_bitmap), block, count) ||
-	    in_range (block, le32_to_cpu(gdp->bg_inode_table),
-		      sb->u.ext3_sb.s_itb_per_group) ||
-	    in_range (block + count - 1, le32_to_cpu(gdp->bg_inode_table),
-		      sb->u.ext3_sb.s_itb_per_group))
-		ext3_error (sb, "ext3_free_blocks",
-			    "Freeing blocks in system zones - "
-			    "Block = %lu, count = %lu",
-			    block, count);
-
 	/*
 	 * We are about to start releasing blocks in the bitmap,
 	 * so we need undo access.
@@ -345,14 +335,24 @@
 	if (err)
 		goto error_return;
 
-	for (i = 0; i < count; i++) {
+	for (i = 0; i < count; i++, block++) {
+		if (block == le32_to_cpu(gdp->bg_block_bitmap) ||
+		    block == le32_to_cpu(gdp->bg_inode_bitmap) ||
+		    in_range(block, le32_to_cpu(gdp->bg_inode_table),
+			     EXT3_SB(sb)->s_itb_per_group)) {
+			ext3_error(sb, __FUNCTION__,
+				   "Freeing block in system zone - block = %lu",
+				   block);
+			continue;
+		}
+
 		/*
 		 * An HJ special.  This is expensive...
 		 */
 #ifdef CONFIG_JBD_DEBUG
 		{
 			struct buffer_head *debug_bh;
-			debug_bh = sb_get_hash_table(sb, block + i);
+			debug_bh = sb_get_hash_table(sb, block);
 			if (debug_bh) {
 				BUFFER_TRACE(debug_bh, "Deleted!");
 				if (!bh2jh(bitmap_bh)->b_committed_data)
@@ -365,9 +365,8 @@
 #endif
 		BUFFER_TRACE(bitmap_bh, "clear bit");
 		if (!ext3_clear_bit (bit + i, bitmap_bh->b_data)) {
-			ext3_error (sb, __FUNCTION__,
-				      "bit already cleared for block %lu", 
-				      block + i);
+			ext3_error(sb, __FUNCTION__,
+				   "bit already cleared for block %lu", block);
 			BUFFER_TRACE(bitmap_bh, "bit already cleared");
 		} else {
 			dquot_freed_blocks++;
@@ -415,7 +414,6 @@
 	if (!err) err = ret;
 
 	if (overflow && !err) {
-		block += count;
 		count = overflow;
 		goto do_more;
 	}
@@ -576,6 +574,7 @@
 
 	ext3_debug ("goal=%lu.\n", goal);
 
+repeat:
 	/*
 	 * First, test whether the goal block is free.
 	 */
@@ -684,10 +683,21 @@
 	if (tmp == le32_to_cpu(gdp->bg_block_bitmap) ||
 	    tmp == le32_to_cpu(gdp->bg_inode_bitmap) ||
 	    in_range (tmp, le32_to_cpu(gdp->bg_inode_table),
-		      sb->u.ext3_sb.s_itb_per_group))
-		ext3_error (sb, "ext3_new_block",
-			    "Allocating block in system zone - "
-			    "block = %u", tmp);
+		      EXT3_SB(sb)->s_itb_per_group)) {
+		ext3_error(sb, __FUNCTION__,
+			   "Allocating block in system zone - block = %u", tmp);
+
+		/* Note: This will potentially use up one of the handle's
+		 * buffer credits.  Normally we have way too many credits,
+		 * so that is OK.  In _very_ rare cases it might not be OK.
+		 * We will trigger an assertion if we run out of credits,
+		 * and we will have to do a full fsck of the filesystem -
+		 * better than randomly corrupting filesystem metadata.
+		 */
+		ext3_set_bit(j, bh->b_data);
+		goto repeat;
+	}
+
 
 	/* The superblock lock should guard against anybody else beating
 	 * us to this point! */