From 306790f75ac2fe021a900395255e468807002c42 Mon Sep 17 00:00:00 2001 From: Carmeli Tamir Date: Thu, 3 Jan 2019 15:28:00 -0800 Subject: fat: new inline functions to determine the FAT variant (32, 16 or 12) This patch introduces 3 new inline functions - is_fat12, is_fat16 and is_fat32, and replaces every occurrence in the code in which the FS variant (whether this is FAT12, FAT16 or FAT32) was previously checked using msdos_sb_info->fat_bits. Link: http://lkml.kernel.org/r/1544990640-11604-4-git-send-email-carmeli.tamir@gmail.com Signed-off-by: Carmeli Tamir Acked-by: OGAWA Hirofumi Reviewed-by: Sergey Senozhatsky Cc: Johannes Thumshirn Cc: Bart Van Assche Cc: Martin K. Petersen Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- fs/fat/fat.h | 25 ++++++++++++++++++++++--- 1 file changed, 22 insertions(+), 3 deletions(-) (limited to 'fs/fat/fat.h') diff --git a/fs/fat/fat.h b/fs/fat/fat.h index 979bb11832f6..922a0c6ba46c 100644 --- a/fs/fat/fat.h +++ b/fs/fat/fat.h @@ -142,13 +142,32 @@ static inline struct msdos_sb_info *MSDOS_SB(struct super_block *sb) return sb->s_fs_info; } +/* + * Functions that determine the variant of the FAT file system (i.e., + * whether this is FAT12, FAT16 or FAT32. + */ +static inline bool is_fat12(const struct msdos_sb_info *sbi) +{ + return sbi->fat_bits == 12; +} + +static inline bool is_fat16(const struct msdos_sb_info *sbi) +{ + return sbi->fat_bits == 16; +} + +static inline bool is_fat32(const struct msdos_sb_info *sbi) +{ + return sbi->fat_bits == 32; +} + /* Maximum number of clusters */ static inline u32 max_fat(struct super_block *sb) { struct msdos_sb_info *sbi = MSDOS_SB(sb); - return sbi->fat_bits == 32 ? MAX_FAT32 : - sbi->fat_bits == 16 ? MAX_FAT16 : MAX_FAT12; + return is_fat32(sbi) ? MAX_FAT32 : + is_fat16(sbi) ? MAX_FAT16 : MAX_FAT12; } static inline struct msdos_inode_info *MSDOS_I(struct inode *inode) @@ -266,7 +285,7 @@ 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) + if (is_fat32(sbi)) cluster |= (le16_to_cpu(de->starthi) << 16); return cluster; } -- cgit v1.2.3-58-ga151