hfsplus: use alloc_mutex in hfsplus_sync_fs

Use alloc_mutex to protect hfsplus_sync_fs against itself and concurrent
allocations, which allows to get rid of lock_super in hfsplus.

Note that most fields in the superblock still aren't protected against
concurrent allocations, that will follow later.

Signed-off-by: Christoph Hellwig <hch@tuxera.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/fs/hfsplus/super.c b/fs/hfsplus/super.c
index 3dc62aa58728..4936642debaa 100644
--- a/fs/hfsplus/super.c
+++ b/fs/hfsplus/super.c
@@ -162,7 +162,7 @@ int hfsplus_sync_fs(struct super_block *sb, int wait)
 
         dprint(DBG_SUPER, "hfsplus_write_super\n");
 
-        lock_super(sb);
+        mutex_lock(&HFSPLUS_SB(sb).alloc_mutex);
         sb->s_dirt = 0;
 
         vhdr->free_blocks = cpu_to_be32(HFSPLUS_SB(sb).free_blocks);
@@ -195,7 +195,7 @@ int hfsplus_sync_fs(struct super_block *sb, int wait)
                 }
                 HFSPLUS_SB(sb).flags &= ~HFSPLUS_SB_WRITEBACKUP;
         }
-        unlock_super(sb);
+        mutex_unlock(&HFSPLUS_SB(sb).alloc_mutex);
         return 0;
 }