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| author | Chengguang Xu <cgxu519@gmx.com> | 2018-03-13 23:01:07 +0800 |
|---|---|---|
| committer | Ilya Dryomov <idryomov@gmail.com> | 2018-04-02 10:12:48 +0200 |
| commit | 47474d0b011bb385719e91a60bb9ff7649d66526 (patch) | |
| tree | a684ee4707ccc3a7909c975f8eec4bca61203f8c /fs/ceph | |
| parent | 57a35dfb522c8bbac622d49f5217906f9b5eceb0 (diff) | |
| download | blackbird-obmc-linux-47474d0b011bb385719e91a60bb9ff7649d66526.tar.gz blackbird-obmc-linux-47474d0b011bb385719e91a60bb9ff7649d66526.zip | |
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.c | 36 |
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 */ |
