[PATCH] ext4: move block number hi bits

move '_hi' bits of block numbers in the larger part of the
block group descriptor structure
Signed-off-by: Alexandre Ratchov <alexandre.ratchov@bull.net>
Signed-off-by: Dave Kleikamp <shaggy@austin.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

fs/ext4/balloc.c

@@ -101,13 +101,13 @@ read_block_bitmap(struct super_block *sb, unsigned int block_group)
 	desc = ext4_get_group_desc (sb, block_group, NULL);
 	if (!desc)
 		goto error_out;
-	bh = sb_bread(sb, ext4_block_bitmap(desc));
+	bh = sb_bread(sb, ext4_block_bitmap(sb, desc));
 	if (!bh)
 		ext4_error (sb, "read_block_bitmap",
 			    "Cannot read block bitmap - "
 			    "block_group = %d, block_bitmap = %llu",
 			    block_group,
-			    ext4_block_bitmap(desc));
+			    ext4_block_bitmap(sb, desc));
 error_out:
 	return bh;
 }
@@ -463,10 +463,10 @@ do_more:
 	if (!desc)
 		goto error_return;
 
-	if (in_range(ext4_block_bitmap(desc), block, count) ||
-	    in_range(ext4_inode_bitmap(desc), block, count) ||
-	    in_range(block, ext4_inode_table(desc), sbi->s_itb_per_group) ||
-	    in_range(block + count - 1, ext4_inode_table(desc),
+	if (in_range(ext4_block_bitmap(sb, desc), block, count) ||
+	    in_range(ext4_inode_bitmap(sb, desc), block, count) ||
+	    in_range(block, ext4_inode_table(sb, desc), sbi->s_itb_per_group) ||
+	    in_range(block + count - 1, ext4_inode_table(sb, desc),
 		     sbi->s_itb_per_group))
 		ext4_error (sb, "ext4_free_blocks",
 			    "Freeing blocks in system zones - "
@@ -1563,11 +1563,11 @@ allocated:
 
 	ret_block = grp_alloc_blk + ext4_group_first_block_no(sb, group_no);
 
-	if (in_range(ext4_block_bitmap(gdp), ret_block, num) ||
-	    in_range(ext4_block_bitmap(gdp), ret_block, num) ||
-	    in_range(ret_block, ext4_inode_table(gdp),
+	if (in_range(ext4_block_bitmap(sb, gdp), ret_block, num) ||
+	    in_range(ext4_block_bitmap(sb, gdp), ret_block, num) ||
+	    in_range(ret_block, ext4_inode_table(sb, gdp),
 		     EXT4_SB(sb)->s_itb_per_group) ||
-	    in_range(ret_block + num - 1, ext4_inode_table(gdp),
+	    in_range(ret_block + num - 1, ext4_inode_table(sb, gdp),
 		     EXT4_SB(sb)->s_itb_per_group))
 		ext4_error(sb, "ext4_new_block",
 			    "Allocating block in system zone - "

fs/ext4/ialloc.c

@@ -60,12 +60,12 @@ read_inode_bitmap(struct super_block * sb, unsigned long block_group)
 	if (!desc)
 		goto error_out;
 
-	bh = sb_bread(sb, ext4_inode_bitmap(desc));
+	bh = sb_bread(sb, ext4_inode_bitmap(sb, desc));
 	if (!bh)
 		ext4_error(sb, "read_inode_bitmap",
 			    "Cannot read inode bitmap - "
 			    "block_group = %lu, inode_bitmap = %llu",
-			    block_group, ext4_inode_bitmap(desc));
+			    block_group, ext4_inode_bitmap(sb, desc));
 error_out:
 	return bh;
 }

fs/ext4/inode.c

@@ -2439,9 +2439,8 @@ static ext4_fsblk_t ext4_get_inode_block(struct super_block *sb,
 	 */
 	offset = ((ino - 1) % EXT4_INODES_PER_GROUP(sb)) *
 		EXT4_INODE_SIZE(sb);
-	block = ext4_inode_table(gdp) + (offset >> EXT4_BLOCK_SIZE_BITS(sb));
-
-
+	block = ext4_inode_table(sb, gdp) +
+		(offset >> EXT4_BLOCK_SIZE_BITS(sb));
 
 	iloc->block_group = block_group;
 	iloc->offset = offset & (EXT4_BLOCK_SIZE(sb) - 1);
@@ -2508,7 +2507,7 @@ static int __ext4_get_inode_loc(struct inode *inode,
 				goto make_io;
 
 			bitmap_bh = sb_getblk(inode->i_sb,
-				ext4_inode_bitmap(desc));
+				ext4_inode_bitmap(inode->i_sb, desc));
 			if (!bitmap_bh)
 				goto make_io;
 

fs/ext4/resize.c

@@ -834,9 +834,9 @@ int ext4_group_add(struct super_block *sb, struct ext4_new_group_data *input)
 	/* Update group descriptor block for new group */
 	gdp = (struct ext4_group_desc *)primary->b_data + gdb_off;
 
-	ext4_block_bitmap_set(gdp, input->block_bitmap); /* LV FIXME */
-	ext4_inode_bitmap_set(gdp, input->inode_bitmap); /* LV FIXME */
-	ext4_inode_table_set(gdp, input->inode_table); /* LV FIXME */
+	ext4_block_bitmap_set(sb, gdp, input->block_bitmap); /* LV FIXME */
+	ext4_inode_bitmap_set(sb, gdp, input->inode_bitmap); /* LV FIXME */
+	ext4_inode_table_set(sb, gdp, input->inode_table); /* LV FIXME */
 	gdp->bg_free_blocks_count = cpu_to_le16(input->free_blocks_count);
 	gdp->bg_free_inodes_count = cpu_to_le16(EXT4_INODES_PER_GROUP(sb));
 

fs/ext4/super.c

@@ -63,40 +63,52 @@ static void ext4_write_super (struct super_block * sb);
 static void ext4_write_super_lockfs(struct super_block *sb);
 
 
-ext4_fsblk_t ext4_block_bitmap(struct ext4_group_desc *bg)
+ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
+			       struct ext4_group_desc *bg)
 {
 	return le32_to_cpu(bg->bg_block_bitmap) |
-		((ext4_fsblk_t)le16_to_cpu(bg->bg_block_bitmap_hi) << 32);
+		(EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
+		 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
 }
 
-ext4_fsblk_t ext4_inode_bitmap(struct ext4_group_desc *bg)
+ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
+			       struct ext4_group_desc *bg)
 {
 	return le32_to_cpu(bg->bg_inode_bitmap) |
-		((ext4_fsblk_t)le16_to_cpu(bg->bg_inode_bitmap_hi) << 32);
+		(EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
+		 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
 }
 
-ext4_fsblk_t ext4_inode_table(struct ext4_group_desc *bg)
+ext4_fsblk_t ext4_inode_table(struct super_block *sb,
+			      struct ext4_group_desc *bg)
 {
 	return le32_to_cpu(bg->bg_inode_table) |
-		((ext4_fsblk_t)le16_to_cpu(bg->bg_inode_table_hi) << 32);
+		(EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
+		 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
 }
 
-void ext4_block_bitmap_set(struct ext4_group_desc *bg, ext4_fsblk_t blk)
+void ext4_block_bitmap_set(struct super_block *sb,
+			   struct ext4_group_desc *bg, ext4_fsblk_t blk)
 {
 	bg->bg_block_bitmap = cpu_to_le32((u32)blk);
-	bg->bg_block_bitmap_hi = cpu_to_le16(blk >> 32);
+	if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
+		bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
 }
 
-void ext4_inode_bitmap_set(struct ext4_group_desc *bg, ext4_fsblk_t blk)
+void ext4_inode_bitmap_set(struct super_block *sb,
+			   struct ext4_group_desc *bg, ext4_fsblk_t blk)
 {
 	bg->bg_inode_bitmap  = cpu_to_le32((u32)blk);
-	bg->bg_inode_bitmap_hi = cpu_to_le16(blk >> 32);
+	if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
+		bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
 }
 
-void ext4_inode_table_set(struct ext4_group_desc *bg, ext4_fsblk_t blk)
+void ext4_inode_table_set(struct super_block *sb,
+			  struct ext4_group_desc *bg, ext4_fsblk_t blk)
 {
 	bg->bg_inode_table = cpu_to_le32((u32)blk);
-	bg->bg_inode_table_hi = cpu_to_le16(blk >> 32);
+	if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
+		bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
 }
 
 /*
@@ -1239,7 +1251,7 @@ static int ext4_check_descriptors (struct super_block * sb)
 		if ((i % EXT4_DESC_PER_BLOCK(sb)) == 0)
 			gdp = (struct ext4_group_desc *)
 					sbi->s_group_desc[desc_block++]->b_data;
-		block_bitmap = ext4_block_bitmap(gdp);
+		block_bitmap = ext4_block_bitmap(sb, gdp);
 		if (block_bitmap < first_block || block_bitmap > last_block)
 		{
 			ext4_error (sb, "ext4_check_descriptors",
@@ -1248,7 +1260,7 @@ static int ext4_check_descriptors (struct super_block * sb)
 				    i, block_bitmap);
 			return 0;
 		}
-		inode_bitmap = ext4_inode_bitmap(gdp);
+		inode_bitmap = ext4_inode_bitmap(sb, gdp);
 		if (inode_bitmap < first_block || inode_bitmap > last_block)
 		{
 			ext4_error (sb, "ext4_check_descriptors",
@@ -1257,7 +1269,7 @@ static int ext4_check_descriptors (struct super_block * sb)
 				    i, inode_bitmap);
 			return 0;
 		}
-		inode_table = ext4_inode_table(gdp);
+		inode_table = ext4_inode_table(sb, gdp);
 		if (inode_table < first_block ||
 		    inode_table + sbi->s_itb_per_group > last_block)
 		{
@@ -1622,11 +1634,11 @@ static int ext4_fill_super (struct super_block *sb, void *data, int silent)
 	}
 	sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
 	if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
-		if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE ||
+		if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
 		    sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
 		    sbi->s_desc_size & (sbi->s_desc_size - 1)) {
 			printk(KERN_ERR
-			       "EXT4-fs: unsupported descriptor size %ld\n",
+			       "EXT4-fs: unsupported descriptor size %lu\n",
 			       sbi->s_desc_size);
 			goto failed_mount;
 		}

include/linux/ext4_fs.h

@@ -129,10 +129,10 @@ struct ext4_group_desc
 	__le16	bg_free_inodes_count;	/* Free inodes count */
 	__le16	bg_used_dirs_count;	/* Directories count */
 	__u16	bg_flags;
-	__le16	bg_block_bitmap_hi;	/* Blocks bitmap block MSB */
-	__le16	bg_inode_bitmap_hi;	/* Inodes bitmap block MSB */
-	__le16	bg_inode_table_hi;	/* Inodes table block MSB */
-	__u16	bg_reserved[3];
+	__u32	bg_reserved[3];
+	__le32	bg_block_bitmap_hi;	/* Blocks bitmap block MSB */
+	__le32	bg_inode_bitmap_hi;	/* Inodes bitmap block MSB */
+	__le32	bg_inode_table_hi;	/* Inodes table block MSB */
 };
 
 #ifdef __KERNEL__
@@ -143,6 +143,7 @@ struct ext4_group_desc
  * Macro-instructions used to manage group descriptors
  */
 #define EXT4_MIN_DESC_SIZE		32
+#define EXT4_MIN_DESC_SIZE_64BIT	64
 #define	EXT4_MAX_DESC_SIZE		EXT4_MIN_BLOCK_SIZE
 #define EXT4_DESC_SIZE(s)		(EXT4_SB(s)->s_desc_size)
 #ifdef __KERNEL__
@@ -904,12 +905,18 @@ extern void ext4_abort (struct super_block *, const char *, const char *, ...)
 extern void ext4_warning (struct super_block *, const char *, const char *, ...)
 	__attribute__ ((format (printf, 3, 4)));
 extern void ext4_update_dynamic_rev (struct super_block *sb);
-extern ext4_fsblk_t ext4_block_bitmap(struct ext4_group_desc *bg);
-extern ext4_fsblk_t ext4_inode_bitmap(struct ext4_group_desc *bg);
-extern ext4_fsblk_t ext4_inode_table(struct ext4_group_desc *bg);
-extern void ext4_block_bitmap_set(struct ext4_group_desc *bg, ext4_fsblk_t blk);
-extern void ext4_inode_bitmap_set(struct ext4_group_desc *bg, ext4_fsblk_t blk);
-extern void ext4_inode_table_set(struct ext4_group_desc *bg, ext4_fsblk_t blk);
+extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
+				      struct ext4_group_desc *bg);
+extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
+				      struct ext4_group_desc *bg);
+extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
+				     struct ext4_group_desc *bg);
+extern void ext4_block_bitmap_set(struct super_block *sb,
+				  struct ext4_group_desc *bg, ext4_fsblk_t blk);
+extern void ext4_inode_bitmap_set(struct super_block *sb,
+				  struct ext4_group_desc *bg, ext4_fsblk_t blk);
+extern void ext4_inode_table_set(struct super_block *sb,
+				 struct ext4_group_desc *bg, ext4_fsblk_t blk);
 
 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
 {