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authorChengguang Xu <cgxu519@gmx.com>2018-03-13 18:01:07 +0300
committerIlya Dryomov <idryomov@gmail.com>2018-04-02 11:12:48 +0300
commit47474d0b011bb385719e91a60bb9ff7649d66526 (patch)
treea684ee4707ccc3a7909c975f8eec4bca61203f8c /fs/ceph
parent57a35dfb522c8bbac622d49f5217906f9b5eceb0 (diff)
downloadlinux-47474d0b011bb385719e91a60bb9ff7649d66526.tar.xz
ceph: optimize mds session register
Do memory allocation first, so that avoid unnecessary initialization of newly allocated session in error case. Signed-off-by: Chengguang Xu <cgxu519@gmx.com> Reviewed-by: "Yan, Zheng" <zyan@redhat.com> Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Diffstat (limited to 'fs/ceph')
-rw-r--r--fs/ceph/mds_client.c36
1 files changed, 19 insertions, 17 deletions
diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c
index b9cbeeb32ab3..a511a777ffb9 100644
--- a/fs/ceph/mds_client.c
+++ b/fs/ceph/mds_client.c
@@ -448,6 +448,25 @@ static struct ceph_mds_session *register_session(struct ceph_mds_client *mdsc,
s = kzalloc(sizeof(*s), GFP_NOFS);
if (!s)
return ERR_PTR(-ENOMEM);
+
+ if (mds >= mdsc->max_sessions) {
+ int newmax = 1 << get_count_order(mds + 1);
+ struct ceph_mds_session **sa;
+
+ dout("%s: realloc to %d\n", __func__, newmax);
+ sa = kcalloc(newmax, sizeof(void *), GFP_NOFS);
+ if (!sa)
+ goto fail_realloc;
+ if (mdsc->sessions) {
+ memcpy(sa, mdsc->sessions,
+ mdsc->max_sessions * sizeof(void *));
+ kfree(mdsc->sessions);
+ }
+ mdsc->sessions = sa;
+ mdsc->max_sessions = newmax;
+ }
+
+ dout("%s: mds%d\n", __func__, mds);
s->s_mdsc = mdsc;
s->s_mds = mds;
s->s_state = CEPH_MDS_SESSION_NEW;
@@ -476,23 +495,6 @@ static struct ceph_mds_session *register_session(struct ceph_mds_client *mdsc,
INIT_LIST_HEAD(&s->s_cap_releases);
INIT_LIST_HEAD(&s->s_cap_flushing);
- dout("register_session mds%d\n", mds);
- if (mds >= mdsc->max_sessions) {
- int newmax = 1 << get_count_order(mds+1);
- struct ceph_mds_session **sa;
-
- dout("register_session realloc to %d\n", newmax);
- sa = kcalloc(newmax, sizeof(void *), GFP_NOFS);
- if (!sa)
- goto fail_realloc;
- if (mdsc->sessions) {
- memcpy(sa, mdsc->sessions,
- mdsc->max_sessions * sizeof(void *));
- kfree(mdsc->sessions);
- }
- mdsc->sessions = sa;
- mdsc->max_sessions = newmax;
- }
mdsc->sessions[mds] = s;
atomic_inc(&mdsc->num_sessions);
refcount_inc(&s->s_ref); /* one ref to sessions[], one to caller */