ceph: factor out libceph from Ceph file system

[karo-tx-linux.git] / net / ceph / msgpool.c

diff --git a/net/ceph/msgpool.c b/net/ceph/msgpool.c
new file mode 100644 (file)
index 0000000..d5f2d97
--- /dev/null
+++ b/net/ceph/msgpool.c
@@ -0,0 +1,64 @@
+#include <linux/ceph/ceph_debug.h>
+
+#include <linux/err.h>
+#include <linux/sched.h>
+#include <linux/types.h>
+#include <linux/vmalloc.h>
+
+#include <linux/ceph/msgpool.h>
+
+static void *alloc_fn(gfp_t gfp_mask, void *arg)
+{
+       struct ceph_msgpool *pool = arg;
+       void *p;
+
+       p = ceph_msg_new(0, pool->front_len, gfp_mask);
+       if (!p)
+               pr_err("msgpool %s alloc failed\n", pool->name);
+       return p;
+}
+
+static void free_fn(void *element, void *arg)
+{
+       ceph_msg_put(element);
+}
+
+int ceph_msgpool_init(struct ceph_msgpool *pool,
+                     int front_len, int size, bool blocking, const char *name)
+{
+       pool->front_len = front_len;
+       pool->pool = mempool_create(size, alloc_fn, free_fn, pool);
+       if (!pool->pool)
+               return -ENOMEM;
+       pool->name = name;
+       return 0;
+}
+
+void ceph_msgpool_destroy(struct ceph_msgpool *pool)
+{
+       mempool_destroy(pool->pool);
+}
+
+struct ceph_msg *ceph_msgpool_get(struct ceph_msgpool *pool,
+                                 int front_len)
+{
+       if (front_len > pool->front_len) {
+               pr_err("msgpool_get pool %s need front %d, pool size is %d\n",
+                      pool->name, front_len, pool->front_len);
+               WARN_ON(1);
+
+               /* try to alloc a fresh message */
+               return ceph_msg_new(0, front_len, GFP_NOFS);
+       }
+
+       return mempool_alloc(pool->pool, GFP_NOFS);
+}
+
+void ceph_msgpool_put(struct ceph_msgpool *pool, struct ceph_msg *msg)
+{
+       /* reset msg front_len; user may have changed it */
+       msg->front.iov_len = pool->front_len;
+       msg->hdr.front_len = cpu_to_le32(pool->front_len);
+
+       kref_init(&msg->kref);  /* retake single ref */
+}