fs: fat: Refactor dirty flag handling

Refactor the dirty flag handling a little bit so an inline
function is called instead of directly stuffing a value into
the variable.

This allows variable that holds the flag to be completely removed
if its not used i.e. CONFIG_FAT_WIRTE=n

Signed-off-by: Daniel Palmer <[email protected]>

1 files changed, 26 insertions, 0 deletions

diff --git a/include/fat.h b/include/fat.h
index bdf430f7067..40da0370a44 100644
--- a/include/fat.h
+++ b/include/fat.h
@@ -165,7 +165,9 @@ typedef struct {
 	int	fatsize;	/* Size of FAT in bits */
 	__u32	fatlength;	/* Length of FAT in sectors */
 	__u16	fat_sect;	/* Starting sector of the FAT */
+#ifdef CONFIG_FAT_WRITE
 	__u8	fat_dirty;      /* Set if fatbuf has been modified */
+#endif
 	__u32	rootdir_sect;	/* Start sector of root directory */
 	__u16	sect_size;	/* Size of sectors in bytes */
 	__u16	clust_size;	/* Size of clusters in sectors */
@@ -190,6 +192,30 @@ static inline u32 sect_to_clust(fsdata *fsdata, int sect)
 	return (sect - fsdata->data_begin) / fsdata->clust_size;
 }
 
+static inline void fat_mark_clean(fsdata *fsdata)
+{
+#ifdef CONFIG_FAT_WRITE
+	fsdata->fat_dirty = 0;
+#endif
+}
+
+static inline void fat_mark_dirty(fsdata *fsdata)
+{
+#ifdef CONFIG_FAT_WRITE
+	fsdata->fat_dirty = 1;
+#endif
+}
+
+static inline bool fat_is_dirty(fsdata *fsdata)
+{
+#ifdef CONFIG_FAT_WRITE
+	if (fsdata->fat_dirty)
+		return true;
+#endif
+
+	return false;
+}
+
 int file_fat_detectfs(void);
 int fat_exists(const char *filename);
 int fat_size(const char *filename, loff_t *size);