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authorSage Weil <sage@newdream.net>2009-12-22 10:45:45 -0800
committerSage Weil <sage@newdream.net>2009-12-23 08:17:20 -0800
commit350b1c32ea58d29e25d63fc25e92dd48f9339546 (patch)
tree4b9e8b06de8fd7e07c2292307e9a67c121f1e079 /fs/ceph/messenger.h
parentec302645f4a9bd9ec757c30d185557e1c0972c1a (diff)
ceph: control access to page vector for incoming data
When we issue an OSD read, we specify a vector of pages that the data is to be read into. The request may be sent multiple times, to multiple OSDs, if the osdmap changes, which means we can get more than one reply. Only read data into the page vector if the reply is coming from the OSD we last sent the request to. Keep track of which connection is using the vector by taking a reference. If another connection was already using the vector before and a new reply comes in on the right connection, revoke the pages from the other connection. Signed-off-by: Sage Weil <sage@newdream.net>
Diffstat (limited to 'fs/ceph/messenger.h')
-rw-r--r--fs/ceph/messenger.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/ceph/messenger.h b/fs/ceph/messenger.h
index 94b55de9033..7e2aab1d3ce 100644
--- a/fs/ceph/messenger.h
+++ b/fs/ceph/messenger.h
@@ -230,6 +230,8 @@ extern void ceph_con_open(struct ceph_connection *con,
extern void ceph_con_close(struct ceph_connection *con);
extern void ceph_con_send(struct ceph_connection *con, struct ceph_msg *msg);
extern void ceph_con_revoke(struct ceph_connection *con, struct ceph_msg *msg);
+extern void ceph_con_revoke_pages(struct ceph_connection *con,
+ struct page **pages);
extern void ceph_con_keepalive(struct ceph_connection *con);
extern struct ceph_connection *ceph_con_get(struct ceph_connection *con);
extern void ceph_con_put(struct ceph_connection *con);