1 files changed, 16 insertions, 5 deletions

diff --git a/fs/fat/fatent.c b/fs/fat/fatent.c
index 2e81ac0df7e2..31f08ab62c56 100644
--- a/fs/fat/fatent.c
+++ b/fs/fat/fatent.c
@@ -308,6 +308,16 @@ void fat_ent_access_init(struct super_block *sb)
         }
 }
 
+static void mark_fsinfo_dirty(struct super_block *sb)
+{
+        struct msdos_sb_info *sbi = MSDOS_SB(sb);
+
+        if (sb->s_flags & MS_RDONLY || sbi->fat_bits != 32)
+                return;
+
+        __mark_inode_dirty(sbi->fsinfo_inode, I_DIRTY_SYNC);
+}
+
 static inline int fat_ent_update_ptr(struct super_block *sb,
                                      struct fat_entry *fatent,
                                      int offset, sector_t blocknr)
@@ -498,7 +508,6 @@ int fat_alloc_clusters(struct inode *inode, int *cluster, int nr_cluster)
                                 sbi->prev_free = entry;
                                 if (sbi->free_clusters != -1)
                                         sbi->free_clusters--;
-                                sb->s_dirt = 1;
 
                                 cluster[idx_clus] = entry;
                                 idx_clus++;
@@ -520,11 +529,11 @@ int fat_alloc_clusters(struct inode *inode, int *cluster, int nr_cluster)
         /* Couldn't allocate the free entries */
         sbi->free_clusters = 0;
         sbi->free_clus_valid = 1;
-        sb->s_dirt = 1;
         err = -ENOSPC;
 
 out:
         unlock_fat(sbi);
+        mark_fsinfo_dirty(sb);
         fatent_brelse(&fatent);
         if (!err) {
                 if (inode_needs_sync(inode))
@@ -549,7 +558,7 @@ int fat_free_clusters(struct inode *inode, int cluster)
         struct fat_entry fatent;
         struct buffer_head *bhs[MAX_BUF_PER_PAGE];
         int i, err, nr_bhs;
-        int first_cl = cluster;
+        int first_cl = cluster, dirty_fsinfo = 0;
 
         nr_bhs = 0;
         fatent_init(&fatent);
@@ -587,7 +596,7 @@ int fat_free_clusters(struct inode *inode, int cluster)
                 ops->ent_put(&fatent, FAT_ENT_FREE);
                 if (sbi->free_clusters != -1) {
                         sbi->free_clusters++;
-                        sb->s_dirt = 1;
+                        dirty_fsinfo = 1;
                 }
 
                 if (nr_bhs + fatent.nr_bhs > MAX_BUF_PER_PAGE) {
@@ -617,6 +626,8 @@ error:
         for (i = 0; i < nr_bhs; i++)
                 brelse(bhs[i]);
         unlock_fat(sbi);
+        if (dirty_fsinfo)
+                mark_fsinfo_dirty(sb);
 
         return err;
 }
@@ -677,7 +688,7 @@ int fat_count_free_clusters(struct super_block *sb)
         }
         sbi->free_clusters = free;
         sbi->free_clus_valid = 1;
-        sb->s_dirt = 1;
+        mark_fsinfo_dirty(sb);
         fatent_brelse(&fatent);
 out:
         unlock_fat(sbi);