fs/fat: Clean up open-coded sector <-> cluster conversions

Use the clust_to_sect() helper that was introduced earlier, and add an
inverse sect_to_clust(), plus update the various spots that open-coded
this conversion previously.

Signed-off-by: Rob Clark <robdclark@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

1 files changed, 5 insertions, 1 deletions

diff --git a/include/fat.h b/include/fat.h
index 0f58939124..bdeda95e6d 100644
--- a/include/fat.h
+++ b/include/fat.h
@@ -177,12 +177,16 @@ typedef struct {
 	__u32	root_cluster;	/* First cluster of root dir for FAT32 */
 } fsdata;
 
-/* TODO clean up places that are open-coding this: */
 static inline u32 clust_to_sect(fsdata *fsdata, u32 clust)
 {
 	return fsdata->data_begin + clust * fsdata->clust_size;
 }
 
+static inline u32 sect_to_clust(fsdata *fsdata, u32 sect)
+{
+	return (sect - fsdata->data_begin) / fsdata->clust_size;
+}
+
 int file_fat_detectfs(void);
 int fat_exists(const char *filename);
 int fat_size(const char *filename, loff_t *size);