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fat: move MAX_FAT to fat.h and change it to inline function

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MAX_FAT is useless in msdos_fs.h, since it uses the MSDOS_SB function
that is defined in fat.h.  So really, this macro can be only called from
code that already includes fat.h.

Hence, this patch moves it to fat.h, right after MSDOS_SB is defined.  I
also changed it to an inline function in order to save the double call
to MSDOS_SB.  This was suggested by [email protected] in the previous
version.

This patch is required for the next in the series, in which the variant
(whether this is FAT12, FAT16 or FAT32) checks are replaced with new
macros.

Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Carmeli Tamir <[email protected]>
Acked-by: OGAWA Hirofumi <[email protected]>
Reviewed-by: Sergey Senozhatsky <[email protected]>
Cc: Bart Van Assche <[email protected]>
Cc: Johannes Thumshirn <[email protected]>
Cc: Martin K. Petersen <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Carmeli Tamir 2019-01-03 15:27:56 -08:00 • committed by Linus Torvalds
commit d19dc01618
3 changed files with 10 additions and 3 deletions
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9
fs/fat/fat.h
View file

@ -142,6 +142,15 @@ static inline struct msdos_sb_info *MSDOS_SB(struct super_block *sb)
return sb->s_fs_info;
}
/* 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;
}
static inline struct msdos_inode_info *MSDOS_I(struct inode *inode)
{
return container_of(inode, struct msdos_inode_info, vfs_inode);

2
fs/fat/inode.c
View file

@ -1781,7 +1781,7 @@ int fat_fill_super(struct super_block *sb, void *data, int silent, int isvfat,
/* check that FAT table does not overflow */
fat_clusters = calc_fat_clusters(sb);
total_clusters = min(total_clusters, fat_clusters - FAT_START_ENT);
if (total_clusters > MAX_FAT(sb)) {
if (total_clusters > max_fat(sb)) {
if (!silent)
fat_msg(sb, KERN_ERR, "count of clusters too big (%u)",
total_clusters);