[PATCH 2/2] fuse: comment control filesystem

[Miklos Szeredi <miklos@szeredi.hu>]

Sprinkle a few comments on the not-so-trivial parts of the control
filesystem.

Signed-off-by: Miklos Szeredi <miklos@szeredi.hu>
---

Index: linux/fs/fuse/control.c
===================================================================
--- linux.orig/fs/fuse/control.c	2006-06-22 17:26:44.000000000 +0200
+++ linux/fs/fuse/control.c	2006-06-23 19:18:02.000000000 +0200
@@ -13,6 +13,10 @@
 
 #define FUSE_CTL_SUPER_MAGIC 0x65735543
 
+/*
+ * This is non-NULL when the single instance of the control filesystem
+ * exists.  Protected by fuse_mutex
+ */
 static struct super_block *fuse_control_sb;
 
 static struct fuse_conn *fuse_ctl_file_conn_get(struct file *file)
@@ -89,6 +93,7 @@ static struct dentry *fuse_ctl_add_dentr
 	inode->i_uid = fc->user_id;
 	inode->i_gid = fc->group_id;
 	inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
+	/* setting ->i_op to NULL is not allowed */
 	if (iop)
 		inode->i_op = iop;
 	inode->i_fop = fop;
@@ -98,6 +103,10 @@ static struct dentry *fuse_ctl_add_dentr
 	return dentry;
 }
 
+/*
+ * Add a connection to the control filesystem (if it exists).  Caller
+ * must host fuse_mutex
+ */
 int fuse_ctl_add_conn(struct fuse_conn *fc)
 {
 	struct dentry *parent;
@@ -128,6 +137,10 @@ int fuse_ctl_add_conn(struct fuse_conn *
 	return -ENOMEM;
 }
 
+/*
+ * Remove a connection from the control filesystem (if it exists).
+ * Caller must host fuse_mutex
+ */
 void fuse_ctl_remove_conn(struct fuse_conn *fc)
 {
 	int i;
-
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