[PATCH v2 1/3] fat: use s_blocksize_bits where SECTOR SIZE alignment is needed

[Namjae Jeon <linkinjeon@gmail.com>]

Currently there is hard-coding at various places in FAT for using
the SECTOR size alignment. So, In order to remove the hard coding
we need to change the usage of '9' in FAT code.

Signed-off-by: Namjae Jeon <linkinjeon@gmail.com>
Signed-off-by: Amit Sahrawat <amit.sahrawat83@gmail.com>
---
 fs/fat/file.c  |    3 ++-
 fs/fat/inode.c |    9 ++++++---
 fs/fat/misc.c  |    9 ++++++---
 3 files changed, 14 insertions(+), 7 deletions(-)

diff --git a/fs/fat/file.c b/fs/fat/file.c
index 1f81cb4..e6dd081 100644
--- a/fs/fat/file.c
+++ b/fs/fat/file.c
@@ -276,7 +276,8 @@ static int fat_free(struct inode *inode, int skip)
 
 		free_start = ret;
 	}
-	inode->i_blocks = skip << (MSDOS_SB(sb)->cluster_bits - 9);
+	inode->i_blocks = skip << (MSDOS_SB(sb)->cluster_bits -
+						sb->s_blocksize_bits);
 
 	/* Freeing the remained cluster chain */
 	return fat_free_clusters(inode, free_start);
diff --git a/fs/fat/inode.c b/fs/fat/inode.c
index 80c6fdd..d077f57 100644
--- a/fs/fat/inode.c
+++ b/fs/fat/inode.c
@@ -387,7 +387,8 @@ static int fat_calc_dir_size(struct inode *inode)
 /* doesn't deal with root inode */
 static int fat_fill_inode(struct inode *inode, struct msdos_dir_entry *de)
 {
-	struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb);
+	struct super_block *sb = inode->i_sb;
+	struct msdos_sb_info *sbi = MSDOS_SB(sb);
 	int error;
 
 	MSDOS_I(inode)->i_pos = 0;
@@ -431,7 +432,8 @@ static int fat_fill_inode(struct inode *inode, struct msdos_dir_entry *de)
 	fat_save_attrs(inode, de->attr);
 
 	inode->i_blocks = ((inode->i_size + (sbi->cluster_size - 1))
-			   & ~((loff_t)sbi->cluster_size - 1)) >> 9;
+			   & ~((loff_t)sbi->cluster_size - 1)) >>
+			   sb->s_blocksize_bits;
 
 	fat_time_fat2unix(sbi, &inode->i_mtime, de->time, de->date, 0);
 	if (sbi->options.isvfat) {
@@ -1148,7 +1150,8 @@ static int fat_read_root(struct inode *inode)
 		inode->i_size = sbi->dir_entries * sizeof(struct msdos_dir_entry);
 	}
 	inode->i_blocks = ((inode->i_size + (sbi->cluster_size - 1))
-			   & ~((loff_t)sbi->cluster_size - 1)) >> 9;
+			   & ~((loff_t)sbi->cluster_size - 1)) >>
+			   sb->s_blocksize_bits;
 	MSDOS_I(inode)->i_logstart = 0;
 	MSDOS_I(inode)->mmu_private = inode->i_size;
 
diff --git a/fs/fat/misc.c b/fs/fat/misc.c
index 6d93360..f78469f 100644
--- a/fs/fat/misc.c
+++ b/fs/fat/misc.c
@@ -150,13 +150,16 @@ int fat_chain_add(struct inode *inode, int new_dclus, int nr_cluster)
 		} else
 			mark_inode_dirty(inode);
 	}
-	if (new_fclus != (inode->i_blocks >> (sbi->cluster_bits - 9))) {
+	if (new_fclus != (inode->i_blocks >> (sbi->cluster_bits -
+			 sb->s_blocksize_bits))) {
 		fat_fs_error(sb, "clusters badly computed (%d != %llu)",
 			     new_fclus,
-			     (llu)(inode->i_blocks >> (sbi->cluster_bits - 9)));
+			     (llu)(inode->i_blocks >> (sbi->cluster_bits -
+			     sb->s_blocksize_bits)));
 		fat_cache_inval_inode(inode);
 	}
-	inode->i_blocks += nr_cluster << (sbi->cluster_bits - 9);
+	inode->i_blocks += nr_cluster << (sbi->cluster_bits -
+			   sb->s_blocksize_bits);
 
 	return 0;
 }
-- 
1.7.9.5