fat: accessors for msdos_dir_entry 'start' fields

[GitHub/mt8127/android_kernel_alcatel_ttab.git] / fs / fat / fat.h

diff --git a/fs/fat/fat.h b/fs/fat/fat.h
index fc35c5c69136e805b41ffa6102dc1878d68f7a3f..2deeeb86f331c8ad70d56300f1b5d4d5b155fe7b 100644 (file)
--- a/fs/fat/fat.h
+++ b/fs/fat/fat.h
@@ -217,6 +217,21 @@ static inline void fat16_towchar(wchar_t *dst, const __u8 *src, size_t len)
 #endif
 }
 
+static inline int fat_get_start(const struct msdos_sb_info *sbi,
+                               const struct msdos_dir_entry *de)
+{
+       int cluster = le16_to_cpu(de->start);
+       if (sbi->fat_bits == 32)
+               cluster |= (le16_to_cpu(de->starthi) << 16);
+       return cluster;
+}
+
+static inline void fat_set_start(struct msdos_dir_entry *de, int cluster)
+{
+       de->start   = cpu_to_le16(cluster);
+       de->starthi = cpu_to_le16(cluster >> 16);
+}
+
 static inline void fatwchar_to16(__u8 *dst, const wchar_t *src, size_t len)
 {
 #ifdef __BIG_ENDIAN