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authorSage Weil <sage@newdream.net>2011-03-25 13:27:48 -0700
committerSage Weil <sage@newdream.net>2011-03-25 13:27:48 -0700
commitef550f6f4f6c9345a27ec85d98f4f7de1adce79c (patch)
treedafd71f3e7fe46ed685b5ab3fd62c2bb7d3cb679
parent59c2be1e4d42c0d4949cecdeef3f37070a1fbc13 (diff)
ceph: flush msgr_wq during mds_client shutdown
The release method for mds connections uses a backpointer to the mds_client, so we need to flush the workqueue of any pending work (and ceph_connection references) prior to freeing the mds_client. This fixes an oops easily triggered under UML by while true ; do mount ... ; umount ... ; done Also fix an outdated comment: the flush in ceph_destroy_client only flushes OSD connections out. This bug is basically an artifact of the ceph -> ceph+libceph conversion. Signed-off-by: Sage Weil <sage@newdream.net>
-rw-r--r--fs/ceph/mds_client.c6
-rw-r--r--net/ceph/ceph_common.c4
2 files changed, 8 insertions, 2 deletions
diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c
index a1ee8fa3a8e7..f60b07b0feb0 100644
--- a/fs/ceph/mds_client.c
+++ b/fs/ceph/mds_client.c
@@ -3215,9 +3215,15 @@ void ceph_mdsc_destroy(struct ceph_fs_client *fsc)
{
struct ceph_mds_client *mdsc = fsc->mdsc;
+ dout("mdsc_destroy %p\n", mdsc);
ceph_mdsc_stop(mdsc);
+
+ /* flush out any connection work with references to us */
+ ceph_msgr_flush();
+
fsc->mdsc = NULL;
kfree(mdsc);
+ dout("mdsc_destroy %p done\n", mdsc);
}
diff --git a/net/ceph/ceph_common.c b/net/ceph/ceph_common.c
index 95f96ab94bba..9bbb356b12e7 100644
--- a/net/ceph/ceph_common.c
+++ b/net/ceph/ceph_common.c
@@ -394,8 +394,8 @@ void ceph_destroy_client(struct ceph_client *client)
ceph_osdc_stop(&client->osdc);
/*
- * make sure mds and osd connections close out before destroying
- * the auth module, which is needed to free those connections'
+ * make sure osd connections close out before destroying the
+ * auth module, which is needed to free those connections'
* ceph_authorizers.
*/
ceph_msgr_flush();