fat: drop lock/unlock super

Removed lock/unlock super. Added a new private s_lock mutex.

Signed-off-by: Marco Stornelli <marco.stornelli@gmail.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 3 insertions, 2 deletions

diff --git a/fs/fat/inode.c b/fs/fat/inode.c
index 76f60c642c06..5bafaad00530 100644
--- a/fs/fat/inode.c
+++ b/fs/fat/inode.c
@@ -673,9 +673,9 @@ static int fat_write_inode(struct inode *inode, struct writeback_control *wbc)
         if (inode->i_ino == MSDOS_FSINFO_INO) {
                 struct super_block *sb = inode->i_sb;
 
-                lock_super(sb);
+                mutex_lock(&MSDOS_SB(sb)->s_lock);
                 err = fat_clusters_flush(sb);
-                unlock_super(sb);
+                mutex_unlock(&MSDOS_SB(sb)->s_lock);
         } else
                 err = __fat_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
 
@@ -1268,6 +1268,7 @@ int fat_fill_super(struct super_block *sb, void *data, int silent, int isvfat,
                 b = (struct fat_boot_sector *) bh->b_data;
         }
 
+        mutex_init(&sbi->s_lock);
         sbi->cluster_size = sb->s_blocksize * sbi->sec_per_clus;
         sbi->cluster_bits = ffs(sbi->cluster_size) - 1;
         sbi->fats = b->fats;