Sanitize ->fsync() for FAT

* mark directory data blocks as assoc. metadata
* add new inode to deal with FAT, mark FAT blocks as assoc. metadata of that
* now ->fsync() is trivial both for files and directories

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 10 insertions, 1 deletions

diff --git a/fs/fat/inode.c b/fs/fat/inode.c
index 2292cbf7d364..476f80b175fe 100644
--- a/fs/fat/inode.c
+++ b/fs/fat/inode.c
@@ -458,6 +458,8 @@ static void fat_put_super(struct super_block *sb)
         if (sb->s_dirt)
                 fat_write_super(sb);
 
+        iput(sbi->fat_inode);
+
         if (sbi->nls_disk) {
                 unload_nls(sbi->nls_disk);
                 sbi->nls_disk = NULL;
@@ -1183,7 +1185,7 @@ static int fat_read_root(struct inode *inode)
 int fat_fill_super(struct super_block *sb, void *data, int silent,
                    const struct inode_operations *fs_dir_inode_ops, int isvfat)
 {
-        struct inode *root_inode = NULL;
+        struct inode *root_inode = NULL, *fat_inode = NULL;
         struct buffer_head *bh;
         struct fat_boot_sector *b;
         struct msdos_sb_info *sbi;
@@ -1423,6 +1425,11 @@ int fat_fill_super(struct super_block *sb, void *data, int silent,
         }
 
         error = -ENOMEM;
+        fat_inode = new_inode(sb);
+        if (!fat_inode)
+                goto out_fail;
+        MSDOS_I(fat_inode)->i_pos = 0;
+        sbi->fat_inode = fat_inode;
         root_inode = new_inode(sb);
         if (!root_inode)
                 goto out_fail;
@@ -1448,6 +1455,8 @@ out_invalid:
                        " on dev %s.\n", sb->s_id);
 
 out_fail:
+        if (fat_inode)
+                iput(fat_inode);
         if (root_inode)
                 iput(root_inode);
         if (sbi->nls_io)