[PATCH] ext4: switch fsblk to sector_t

Redefine ext3 in-kernel filesystem block type (ext3_fsblk_t) from unsigned
long to sector_t, to allow kernel to handle  >32 bit ext3 blocks.
Signed-off-by: Mingming Cao <cmm@us.ibm.com>
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

@@ -147,7 +147,7 @@ static void __rsv_window_dump(struct rb_root *root, int verbose,
 		rsv = list_entry(n, struct ext4_reserve_window_node, rsv_node);
 		if (verbose)
 			printk("reservation window 0x%p "
-			       "start:  %lu, end:  %lu\n",
+			       "start:  "E3FSBLK", end:  "E3FSBLK"\n",
 			       rsv, rsv->rsv_start, rsv->rsv_end);
 		if (rsv->rsv_start && rsv->rsv_start >= rsv->rsv_end) {
 			printk("Bad reservation %p (start >= end)\n",
@@ -443,10 +443,7 @@ void ext4_free_blocks_sb(handle_t *handle, struct super_block *sb,
 
 do_more:
 	overflow = 0;
-	block_group = (block - le32_to_cpu(es->s_first_data_block)) /
-		      EXT4_BLOCKS_PER_GROUP(sb);
-	bit = (block - le32_to_cpu(es->s_first_data_block)) %
-		      EXT4_BLOCKS_PER_GROUP(sb);
+	ext4_get_group_no_and_offset(sb, block, &block_group, &bit);
 	/*
 	 * Check to see if we are freeing blocks across a group
 	 * boundary.
@@ -1404,7 +1401,7 @@ ext4_fsblk_t ext4_new_blocks(handle_t *handle, struct inode *inode,
 {
 	struct buffer_head *bitmap_bh = NULL;
 	struct buffer_head *gdp_bh;
-	int group_no;
+	unsigned long group_no;
 	int goal_group;
 	ext4_grpblk_t grp_target_blk;	/* blockgroup relative goal block */
 	ext4_grpblk_t grp_alloc_blk;	/* blockgroup-relative allocated block*/
@@ -1467,8 +1464,7 @@ ext4_fsblk_t ext4_new_blocks(handle_t *handle, struct inode *inode,
 	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)) /
-			EXT4_BLOCKS_PER_GROUP(sb);
+	ext4_get_group_no_and_offset(sb, goal, &group_no, &grp_target_blk);
 	goal_group = group_no;
 retry_alloc:
 	gdp = ext4_get_group_desc(sb, group_no, &gdp_bh);
@@ -1485,8 +1481,6 @@ ext4_fsblk_t ext4_new_blocks(handle_t *handle, struct inode *inode,
 		my_rsv = NULL;
 
 	if (free_blocks > 0) {
-		grp_target_blk = ((goal - le32_to_cpu(es->s_first_data_block)) %
-				EXT4_BLOCKS_PER_GROUP(sb));
 		bitmap_bh = read_block_bitmap(sb, group_no);
 		if (!bitmap_bh)
 			goto io_error;
@@ -1613,7 +1607,7 @@ ext4_fsblk_t ext4_new_blocks(handle_t *handle, struct inode *inode,
 	if (ret_block + num - 1 >= le32_to_cpu(es->s_blocks_count)) {
 		ext4_error(sb, "ext4_new_block",
 			    "block("E3FSBLK") >= blocks count(%d) - "
-			    "block_group = %d, es == %p ", ret_block,
+			    "block_group = %lu, es == %p ", ret_block,
 			le32_to_cpu(es->s_blocks_count), group_no, es);
 		goto out;
 	}
@@ -1733,9 +1727,10 @@ ext4_fsblk_t ext4_count_free_blocks(struct super_block *sb)
 static inline int
 block_in_use(ext4_fsblk_t block, struct super_block *sb, unsigned char *map)
 {
-	return ext4_test_bit ((block -
-		le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block)) %
-			 EXT4_BLOCKS_PER_GROUP(sb), map);
+	ext4_grpblk_t offset;
+
+	ext4_get_group_no_and_offset(sb, block, NULL, &offset);
+	return ext4_test_bit (offset, map);
 }
 
 static inline int test_root(int a, int b)

fs/ext4/ialloc.c

@@ -23,7 +23,7 @@
 #include <linux/buffer_head.h>
 #include <linux/random.h>
 #include <linux/bitops.h>
-
+#include <linux/blkdev.h>
 #include <asm/byteorder.h>
 
 #include "xattr.h"
@@ -274,7 +274,8 @@ static int find_group_orlov(struct super_block *sb, struct inode *parent)
 	freei = percpu_counter_read_positive(&sbi->s_freeinodes_counter);
 	avefreei = freei / ngroups;
 	freeb = percpu_counter_read_positive(&sbi->s_freeblocks_counter);
-	avefreeb = freeb / ngroups;
+	avefreeb = freeb;
+	sector_div(avefreeb, ngroups);
 	ndirs = percpu_counter_read_positive(&sbi->s_dirs_counter);
 
 	if ((parent == sb->s_root->d_inode) ||
@@ -303,13 +304,15 @@ static int find_group_orlov(struct super_block *sb, struct inode *parent)
 		goto fallback;
 	}
 
-	blocks_per_dir = (le32_to_cpu(es->s_blocks_count) - freeb) / ndirs;
+	blocks_per_dir = le32_to_cpu(es->s_blocks_count) - freeb;
+	sector_div(blocks_per_dir, ndirs);
 
 	max_dirs = ndirs / ngroups + inodes_per_group / 16;
 	min_inodes = avefreei - inodes_per_group / 4;
 	min_blocks = avefreeb - EXT4_BLOCKS_PER_GROUP(sb) / 4;
 
-	max_debt = EXT4_BLOCKS_PER_GROUP(sb) / max(blocks_per_dir, (ext4_fsblk_t)BLOCK_COST);
+	max_debt = EXT4_BLOCKS_PER_GROUP(sb);
+	sector_div(max_debt, max(blocks_per_dir, (ext4_fsblk_t)BLOCK_COST));
 	if (max_debt * INODE_COST > inodes_per_group)
 		max_debt = inodes_per_group / INODE_COST;
 	if (max_debt > 255)

fs/ext4/resize.c

@@ -36,7 +36,7 @@ static int verify_group_input(struct super_block *sb,
 		 le16_to_cpu(es->s_reserved_gdt_blocks)) : 0;
 	ext4_fsblk_t metaend = start + overhead;
 	struct buffer_head *bh = NULL;
-	ext4_grpblk_t free_blocks_count;
+	ext4_grpblk_t free_blocks_count, offset;
 	int err = -EINVAL;
 
 	input->free_blocks_count = free_blocks_count =
@@ -49,13 +49,13 @@ static int verify_group_input(struct super_block *sb,
 		       "no-super", input->group, input->blocks_count,
 		       free_blocks_count, input->reserved_blocks);
 
+	ext4_get_group_no_and_offset(sb, start, NULL, &offset);
 	if (group != sbi->s_groups_count)
 		ext4_warning(sb, __FUNCTION__,
 			     "Cannot add at group %u (only %lu groups)",
 			     input->group, sbi->s_groups_count);
-	else if ((start - le32_to_cpu(es->s_first_data_block)) %
-		 EXT4_BLOCKS_PER_GROUP(sb))
-		ext4_warning(sb, __FUNCTION__, "Last group not full");
+	else if (offset != 0)
+			ext4_warning(sb, __FUNCTION__, "Last group not full");
 	else if (input->reserved_blocks > input->blocks_count / 5)
 		ext4_warning(sb, __FUNCTION__, "Reserved blocks too high (%u)",
 			     input->reserved_blocks);
@@ -945,7 +945,7 @@ int ext4_group_extend(struct super_block *sb, struct ext4_super_block *es,
 
 	if (n_blocks_count > (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) {
 		printk(KERN_ERR "EXT4-fs: filesystem on %s:"
-			" too large to resize to %lu blocks safely\n",
+			" too large to resize to "E3FSBLK" blocks safely\n",
 			sb->s_id, n_blocks_count);
 		if (sizeof(sector_t) < 8)
 			ext4_warning(sb, __FUNCTION__,
@@ -960,8 +960,7 @@ int ext4_group_extend(struct super_block *sb, struct ext4_super_block *es,
 	}
 
 	/* Handle the remaining blocks in the last group only. */
-	last = (o_blocks_count - le32_to_cpu(es->s_first_data_block)) %
-		EXT4_BLOCKS_PER_GROUP(sb);
+	ext4_get_group_no_and_offset(sb, o_blocks_count, NULL, &last);
 
 	if (last == 0) {
 		ext4_warning(sb, __FUNCTION__,

fs/ext4/super.c

@@ -1433,8 +1433,8 @@ static int ext4_fill_super (struct super_block *sb, void *data, int silent)
 	 * block sizes.  We need to calculate the offset from buffer start.
 	 */
 	if (blocksize != EXT4_MIN_BLOCK_SIZE) {
-		logic_sb_block = (sb_block * EXT4_MIN_BLOCK_SIZE) / blocksize;
-		offset = (sb_block * EXT4_MIN_BLOCK_SIZE) % blocksize;
+		logic_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
+		offset = sector_div(logic_sb_block, blocksize);
 	} else {
 		logic_sb_block = sb_block;
 	}
@@ -1539,8 +1539,8 @@ static int ext4_fill_super (struct super_block *sb, void *data, int silent)
 
 		brelse (bh);
 		sb_set_blocksize(sb, blocksize);
-		logic_sb_block = (sb_block * EXT4_MIN_BLOCK_SIZE) / blocksize;
-		offset = (sb_block * EXT4_MIN_BLOCK_SIZE) % blocksize;
+		logic_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
+		offset = sector_div(logic_sb_block, blocksize);
 		bh = sb_bread(sb, logic_sb_block);
 		if (!bh) {
 			printk(KERN_ERR

include/linux/ext4_fs.h

@@ -17,6 +17,7 @@
 #define _LINUX_EXT4_FS_H
 
 #include <linux/types.h>
+#include <linux/blkdev.h>
 #include <linux/magic.h>
 
 /*
@@ -749,6 +750,27 @@ ext4_group_first_block_no(struct super_block *sb, unsigned long group_no)
  */
 #define ERR_BAD_DX_DIR	-75000
 
+/*
+ * This function calculate the block group number and offset,
+ * given a block number
+ */
+
+static inline void ext4_get_group_no_and_offset(struct super_block * sb,
+                                ext4_fsblk_t blocknr, unsigned long* blockgrpp,
+                                ext4_grpblk_t *offsetp)
+{
+        struct ext4_super_block *es = EXT4_SB(sb)->s_es;
+	ext4_grpblk_t offset;
+
+        blocknr = blocknr - le32_to_cpu(es->s_first_data_block);
+        offset = sector_div(blocknr, EXT4_BLOCKS_PER_GROUP(sb));
+	if (offsetp)
+		*offsetp = offset;
+	if (blockgrpp)
+	        *blockgrpp = blocknr;
+
+}
+
 /*
  * Function prototypes
  */
@@ -762,6 +784,10 @@ ext4_group_first_block_no(struct super_block *sb, unsigned long group_no)
 # define NORET_AND     noreturn,
 
 /* balloc.c */
+extern unsigned int ext4_block_group(struct super_block *sb,
+			ext4_fsblk_t blocknr);
+extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
+			ext4_fsblk_t blocknr);
 extern int ext4_bg_has_super(struct super_block *sb, int group);
 extern unsigned long ext4_bg_num_gdb(struct super_block *sb, int group);
 extern ext4_fsblk_t ext4_new_block (handle_t *handle, struct inode *inode,

include/linux/ext4_fs_i.h

@@ -25,9 +25,13 @@
 typedef int ext4_grpblk_t;
 
 /* data type for filesystem-wide blocks number */
-typedef unsigned long ext4_fsblk_t;
+typedef sector_t ext4_fsblk_t;
 
+#if BITS_PER_LONG == 64
 #define E3FSBLK "%lu"
+#else
+#define E3FSBLK "%llu"
+#endif
 
 struct ext4_reserve_window {
 	ext4_fsblk_t	_rsv_start;	/* First byte reserved */