Changed off_t to loff_t

- off_t is long, loff_t is long long (32bit vs. 64bit)
- exfat requites 64 bit to support larger than 2GB fs

Change-Id: I70293e45d7d6686317edc759092e738a2ebdd860
diff --git a/exfat/libexfat/exfat.h b/exfat/libexfat/exfat.h
index 5beba7c..009a0c0 100644
--- a/exfat/libexfat/exfat.h
+++ b/exfat/libexfat/exfat.h
@@ -66,8 +66,8 @@
 	((bitmap)[BMAP_BLOCK(index)] &= ~BMAP_MASK(index))
 
 /* The size of off_t type must be 64 bits. File systems larger than 2 GB will
-   be corrupted with 32-bit off_t. */
-STATIC_ASSERT(sizeof(off_t) == 8);
+   be corrupted with 32-bit off_t. So, we use loff_t here.*/
+STATIC_ASSERT(sizeof(loff_t) == 8);
 
 struct exfat_node
 {
@@ -80,7 +80,7 @@
 	uint32_t fptr_index;
 	cluster_t fptr_cluster;
 	cluster_t entry_cluster;
-	off_t entry_offset;
+	loff_t entry_offset;
 	cluster_t start_cluster;
 	int flags;
 	uint64_t size;
@@ -146,18 +146,18 @@
 int exfat_close(struct exfat_dev* dev);
 int exfat_fsync(struct exfat_dev* dev);
 enum exfat_mode exfat_get_mode(const struct exfat_dev* dev);
-off_t exfat_get_size(const struct exfat_dev* dev);
-off_t exfat_seek(struct exfat_dev* dev, off_t offset, int whence);
+loff_t exfat_get_size(const struct exfat_dev* dev);
+loff_t exfat_seek(struct exfat_dev* dev, loff_t offset, int whence);
 ssize_t exfat_read(struct exfat_dev* dev, void* buffer, size_t size);
 ssize_t exfat_write(struct exfat_dev* dev, const void* buffer, size_t size);
 ssize_t exfat_pread(struct exfat_dev* dev, void* buffer, size_t size,
-		off_t offset);
+		loff_t offset);
 ssize_t exfat_pwrite(struct exfat_dev* dev, const void* buffer, size_t size,
-		off_t offset);
+		loff_t offset);
 ssize_t exfat_generic_pread(const struct exfat* ef, struct exfat_node* node,
-		void* buffer, size_t size, off_t offset);
+		void* buffer, size_t size, loff_t offset);
 ssize_t exfat_generic_pwrite(struct exfat* ef, struct exfat_node* node,
-		const void* buffer, size_t size, off_t offset);
+		const void* buffer, size_t size, loff_t offset);
 
 int exfat_opendir(struct exfat* ef, struct exfat_node* dir,
 		struct exfat_iterator* it);
@@ -168,7 +168,7 @@
 int exfat_split(struct exfat* ef, struct exfat_node** parent,
 		struct exfat_node** node, le16_t* name, const char* path);
 
-off_t exfat_c2o(const struct exfat* ef, cluster_t cluster);
+loff_t exfat_c2o(const struct exfat* ef, cluster_t cluster);
 cluster_t exfat_next_cluster(const struct exfat* ef,
 		const struct exfat_node* node, cluster_t cluster);
 cluster_t exfat_advance_cluster(const struct exfat* ef,
@@ -178,7 +178,7 @@
 int exfat_truncate(struct exfat* ef, struct exfat_node* node, uint64_t size,
 		bool erase);
 uint32_t exfat_count_free_clusters(const struct exfat* ef);
-int exfat_find_used_sectors(const struct exfat* ef, off_t* a, off_t* b);
+int exfat_find_used_sectors(const struct exfat* ef, loff_t* a, loff_t* b);
 
 void exfat_stat(const struct exfat* ef, const struct exfat_node* node,
 		struct stat* stbuf);