Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client: (22 commits)
  ceph: do not carry i_lock for readdir from dcache
  fs/ceph/xattr.c: Use kmemdup
  rbd: passing wrong variable to bvec_kunmap_irq()
  rbd: null vs ERR_PTR
  ceph: fix num_pages_free accounting in pagelist
  ceph: add CEPH_MDS_OP_SETDIRLAYOUT and associated ioctl.
  ceph: don't crash when passed bad mount options
  ceph: fix debugfs warnings
  block: rbd: removing unnecessary test
  block: rbd: fixed may leaks
  ceph: switch from BKL to lock_flocks()
  ceph: preallocate flock state without locks held
  ceph: add pagelist_reserve, pagelist_truncate, pagelist_set_cursor
  ceph: use mapping->nrpages to determine if mapping is empty
  ceph: only invalidate on check_caps if we actually have pages
  ceph: do not hide .snap in root directory
  rbd: introduce rados block device (rbd), based on libceph
  ceph: factor out libceph from Ceph file system
  ceph-rbd: osdc support for osd call and rollback operations
  ceph: messenger and osdc changes for rbd
  ...

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 */
+}