[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>
diff --git a/include/linux/ext4_fs.h b/include/linux/ext4_fs.h
index b61181aad..e952c6d 100644
--- a/include/linux/ext4_fs.h
+++ b/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>
/*
@@ -750,6 +751,27 @@
#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 @@
# 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,