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authorYehuda Sadeh <yehuda@hq.newdream.net>2010-04-07 02:14:15 +0400
committerSage Weil <sage@newdream.net>2010-10-21 02:37:28 +0400
commit3d14c5d2b6e15c21d8e5467dc62d33127c23a644 (patch)
tree7d123c47847df9d1e865b6b78dc7da3fe739b704 /net/ceph/msgpool.c
parentae1533b62b3369e6ae32338f4a77d64d0e88f676 (diff)
downloadlinux-3d14c5d2b6e15c21d8e5467dc62d33127c23a644.tar.xz
ceph: factor out libceph from Ceph file system
This factors out protocol and low-level storage parts of ceph into a separate libceph module living in net/ceph and include/linux/ceph. This is mostly a matter of moving files around. However, a few key pieces of the interface change as well: - ceph_client becomes ceph_fs_client and ceph_client, where the latter captures the mon and osd clients, and the fs_client gets the mds client and file system specific pieces. - Mount option parsing and debugfs setup is correspondingly broken into two pieces. - The mon client gets a generic handler callback for otherwise unknown messages (mds map, in this case). - The basic supported/required feature bits can be expanded (and are by ceph_fs_client). No functional change, aside from some subtle error handling cases that got cleaned up in the refactoring process. Signed-off-by: Sage Weil <sage@newdream.net>
Diffstat (limited to 'net/ceph/msgpool.c')
-rw-r--r--net/ceph/msgpool.c64
1 files changed, 64 insertions, 0 deletions
diff --git a/net/ceph/msgpool.c b/net/ceph/msgpool.c
new file mode 100644
index 000000000000..d5f2d97ac05c
--- /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 */
+}