1 files changed, 125 insertions, 0 deletions

diff --git a/net/9p/util.c b/net/9p/util.c
new file mode 100644
index 000000000000..22077b79395d
--- /dev/null
+++ b/net/9p/util.c
@@ -0,0 +1,125 @@
+/*
+ *  net/9p/util.c
+ *
+ *  This file contains some helper functions
+ *
+ *  Copyright (C) 2007 by Latchesar Ionkov <lucho@ionkov.net>
+ *  Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
+ *  Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License version 2
+ *  as published by the Free Software Foundation.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to:
+ *  Free Software Foundation
+ *  51 Franklin Street, Fifth Floor
+ *  Boston, MA  02111-1301  USA
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/fs.h>
+#include <linux/sched.h>
+#include <linux/parser.h>
+#include <linux/idr.h>
+#include <net/9p/9p.h>
+
+struct p9_idpool {
+        struct semaphore lock;
+        struct idr pool;
+};
+
+struct p9_idpool *p9_idpool_create(void)
+{
+        struct p9_idpool *p;
+
+        p = kmalloc(sizeof(struct p9_idpool), GFP_KERNEL);
+        if (!p)
+                return ERR_PTR(-ENOMEM);
+
+        init_MUTEX(&p->lock);
+        idr_init(&p->pool);
+
+        return p;
+}
+EXPORT_SYMBOL(p9_idpool_create);
+
+void p9_idpool_destroy(struct p9_idpool *p)
+{
+        idr_destroy(&p->pool);
+        kfree(p);
+}
+EXPORT_SYMBOL(p9_idpool_destroy);
+
+/**
+ * p9_idpool_get - allocate numeric id from pool
+ * @p - pool to allocate from
+ *
+ * XXX - This seems to be an awful generic function, should it be in idr.c with
+ *            the lock included in struct idr?
+ */
+
+int p9_idpool_get(struct p9_idpool *p)
+{
+        int i = 0;
+        int error;
+
+retry:
+        if (idr_pre_get(&p->pool, GFP_KERNEL) == 0)
+                return 0;
+
+        if (down_interruptible(&p->lock) == -EINTR) {
+                P9_EPRINTK(KERN_WARNING, "Interrupted while locking\n");
+                return -1;
+        }
+
+        /* no need to store exactly p, we just need something non-null */
+        error = idr_get_new(&p->pool, p, &i);
+        up(&p->lock);
+
+        if (error == -EAGAIN)
+                goto retry;
+        else if (error)
+                return -1;
+
+        return i;
+}
+EXPORT_SYMBOL(p9_idpool_get);
+
+/**
+ * p9_idpool_put - release numeric id from pool
+ * @p - pool to allocate from
+ *
+ * XXX - This seems to be an awful generic function, should it be in idr.c with
+ *            the lock included in struct idr?
+ */
+
+void p9_idpool_put(int id, struct p9_idpool *p)
+{
+        if (down_interruptible(&p->lock) == -EINTR) {
+                P9_EPRINTK(KERN_WARNING, "Interrupted while locking\n");
+                return;
+        }
+        idr_remove(&p->pool, id);
+        up(&p->lock);
+}
+EXPORT_SYMBOL(p9_idpool_put);
+
+/**
+ * p9_idpool_check - check if the specified id is available
+ * @id - id to check
+ * @p - pool
+ */
+int p9_idpool_check(int id, struct p9_idpool *p)
+{
+        return idr_find(&p->pool, id) != NULL;
+}
+EXPORT_SYMBOL(p9_idpool_check);