1 files changed, 28 insertions, 35 deletions

diff --git a/fs/fat/inode.c b/fs/fat/inode.c
index b3d290c1b51..a3d81ebf6d8 100644
--- a/fs/fat/inode.c
+++ b/fs/fat/inode.c
@@ -459,37 +459,11 @@ static void fat_evict_inode(struct inode *inode)
 	fat_detach(inode);
 }
 
-static void fat_write_super(struct super_block *sb)
-{
-	lock_super(sb);
-	sb->s_dirt = 0;
-
-	if (!(sb->s_flags & MS_RDONLY))
-		fat_clusters_flush(sb);
-	unlock_super(sb);
-}
-
-static int fat_sync_fs(struct super_block *sb, int wait)
-{
-	int err = 0;
-
-	if (sb->s_dirt) {
-		lock_super(sb);
-		sb->s_dirt = 0;
-		err = fat_clusters_flush(sb);
-		unlock_super(sb);
-	}
-
-	return err;
-}
-
 static void fat_put_super(struct super_block *sb)
 {
 	struct msdos_sb_info *sbi = MSDOS_SB(sb);
 
-	if (sb->s_dirt)
-		fat_write_super(sb);
-
+	iput(sbi->fsinfo_inode);
 	iput(sbi->fat_inode);
 
 	unload_nls(sbi->nls_disk);
@@ -661,7 +635,18 @@ retry:
 
 static int fat_write_inode(struct inode *inode, struct writeback_control *wbc)
 {
-	return __fat_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
+	int err;
+
+	if (inode->i_ino == MSDOS_FSINFO_INO) {
+		struct super_block *sb = inode->i_sb;
+
+		lock_super(sb);
+		err = fat_clusters_flush(sb);
+		unlock_super(sb);
+	} else
+		err = __fat_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
+
+	return err;
 }
 
 int fat_sync_inode(struct inode *inode)
@@ -678,8 +663,6 @@ static const struct super_operations fat_sops = {
 	.write_inode	= fat_write_inode,
 	.evict_inode	= fat_evict_inode,
 	.put_super	= fat_put_super,
-	.write_super	= fat_write_super,
-	.sync_fs	= fat_sync_fs,
 	.statfs		= fat_statfs,
 	.remount_fs	= fat_remount,
 
@@ -752,10 +735,9 @@ static struct dentry *fat_fh_to_dentry(struct super_block *sb,
 }
 
 static int
-fat_encode_fh(struct dentry *de, __u32 *fh, int *lenp, int connectable)
+fat_encode_fh(struct inode *inode, __u32 *fh, int *lenp, struct inode *parent)
 {
 	int len = *lenp;
-	struct inode *inode =  de->d_inode;
 	u32 ipos_h, ipos_m, ipos_l;
 
 	if (len < 5) {
@@ -771,9 +753,9 @@ fat_encode_fh(struct dentry *de, __u32 *fh, int *lenp, int connectable)
 	fh[1] = inode->i_generation;
 	fh[2] = ipos_h;
 	fh[3] = ipos_m | MSDOS_I(inode)->i_logstart;
-	spin_lock(&de->d_lock);
-	fh[4] = ipos_l | MSDOS_I(de->d_parent->d_inode)->i_logstart;
-	spin_unlock(&de->d_lock);
+	fh[4] = ipos_l;
+	if (parent)
+		fh[4] |= MSDOS_I(parent)->i_logstart;
 	return 3;
 }
 
@@ -1244,6 +1226,7 @@ int fat_fill_super(struct super_block *sb, void *data, int silent, int isvfat,
 		   void (*setup)(struct super_block *))
 {
 	struct inode *root_inode = NULL, *fat_inode = NULL;
+	struct inode *fsinfo_inode = NULL;
 	struct buffer_head *bh;
 	struct fat_boot_sector *b;
 	struct msdos_sb_info *sbi;
@@ -1490,6 +1473,14 @@ int fat_fill_super(struct super_block *sb, void *data, int silent, int isvfat,
 		goto out_fail;
 	MSDOS_I(fat_inode)->i_pos = 0;
 	sbi->fat_inode = fat_inode;
+
+	fsinfo_inode = new_inode(sb);
+	if (!fsinfo_inode)
+		goto out_fail;
+	fsinfo_inode->i_ino = MSDOS_FSINFO_INO;
+	sbi->fsinfo_inode = fsinfo_inode;
+	insert_inode_hash(fsinfo_inode);
+
 	root_inode = new_inode(sb);
 	if (!root_inode)
 		goto out_fail;
@@ -1516,6 +1507,8 @@ out_invalid:
 		fat_msg(sb, KERN_INFO, "Can't find a valid FAT filesystem");
 
 out_fail:
+	if (fsinfo_inode)
+		iput(fsinfo_inode);
 	if (fat_inode)
 		iput(fat_inode);
 	unload_nls(sbi->nls_io);