From a9fdbf8c6070d49c482e209df7ee93d9ec41ea27 Mon Sep 17 00:00:00 2001
From: Christoph Hellwig <hch@lst.de>
Date: Fri, 1 Oct 2010 05:41:50 +0200
Subject: 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>

diff --git a/fs/hfsplus/super.c b/fs/hfsplus/super.c
index 3dc62aa..4936642 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;
 }
 
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