linux-kernel - [PATCH][RT] btrfs compile fix

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Date:	Wed, 12 Aug 2009 21:45:29 -0700
From:	Sven-Thorsten Dietrich <sdietrich@...ell.com>
To:	linux-rt-users <linux-rt-users@...r.kernel.org>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH][RT] btrfs compile fix

Subject: add back in btrfs commit_root_sem.
From: rt-2.6.31-rc4-rt1

Seems to be in flux, but these are required for the status-quo to compile.

Not run-time tested.

Signed-off-by: Sven-Thorsten Dietrich <sdietrich@...e.de>
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -942,6 +959,9 @@ struct btrfs_root {
 	/* the node lock is held while changing the node pointer */
 	spinlock_t node_lock;
 
+	/* taken when updating the commit root */
+	struct rw_semaphore commit_root_sem;
+
 	struct extent_buffer *commit_root;
 	struct btrfs_root *log_root;
 	struct btrfs_root *reloc_root;
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -909,6 +909,7 @@ static int __setup_root(u32 nodesize, u32 leafsize, u32 sectorsize,
 	spin_lock_init(&root->inode_lock);
 	mutex_init(&root->objectid_mutex);
 	mutex_init(&root->log_mutex);
+	init_rwsem(&root->commit_root_sem);
 	init_waitqueue_head(&root->log_writer_wait);
 	init_waitqueue_head(&root->log_commit_wait[0]);
 	init_waitqueue_head(&root->log_commit_wait[1]);
 


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