libceph: reference counting pagelist
this allow pagelist to present data that may be sent multiple times.
Signed-off-by: Yan, Zheng <zyan@redhat.com>
Reviewed-by: Sage Weil <sage@redhat.com>
diff --git a/net/ceph/messenger.c b/net/ceph/messenger.c
index e7d9411..9764c77 100644
--- a/net/ceph/messenger.c
+++ b/net/ceph/messenger.c
@@ -3071,10 +3071,8 @@
return;
WARN_ON(!list_empty(&data->links));
- if (data->type == CEPH_MSG_DATA_PAGELIST) {
+ if (data->type == CEPH_MSG_DATA_PAGELIST)
ceph_pagelist_release(data->pagelist);
- kfree(data->pagelist);
- }
kmem_cache_free(ceph_msg_data_cache, data);
}
diff --git a/net/ceph/pagelist.c b/net/ceph/pagelist.c
index 92866be..c7c220a 100644
--- a/net/ceph/pagelist.c
+++ b/net/ceph/pagelist.c
@@ -1,5 +1,6 @@
#include <linux/module.h>
#include <linux/gfp.h>
+#include <linux/slab.h>
#include <linux/pagemap.h>
#include <linux/highmem.h>
#include <linux/ceph/pagelist.h>
@@ -13,8 +14,10 @@
}
}
-int ceph_pagelist_release(struct ceph_pagelist *pl)
+void ceph_pagelist_release(struct ceph_pagelist *pl)
{
+ if (!atomic_dec_and_test(&pl->refcnt))
+ return;
ceph_pagelist_unmap_tail(pl);
while (!list_empty(&pl->head)) {
struct page *page = list_first_entry(&pl->head, struct page,
@@ -23,7 +26,7 @@
__free_page(page);
}
ceph_pagelist_free_reserve(pl);
- return 0;
+ kfree(pl);
}
EXPORT_SYMBOL(ceph_pagelist_release);