From: Xiubo Li <xiubli@xxxxxxxxxx> The request's r_session maybe changed when it was forwarded or resent. Cc: stable@xxxxxxxxxxxxxxx URL: https://bugzilla.redhat.com/show_bug.cgi?id=2137955 Signed-off-by: Xiubo Li <xiubli@xxxxxxxxxx> --- fs/ceph/caps.c | 60 ++++++++++++++++---------------------------------- 1 file changed, 19 insertions(+), 41 deletions(-) diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c index 894adfb4a092..83f9e18e3169 100644 --- a/fs/ceph/caps.c +++ b/fs/ceph/caps.c @@ -2297,8 +2297,10 @@ static int flush_mdlog_and_wait_inode_unsafe_requests(struct inode *inode) struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc; struct ceph_inode_info *ci = ceph_inode(inode); struct ceph_mds_request *req1 = NULL, *req2 = NULL; + struct ceph_mds_session **sessions = NULL; + struct ceph_mds_session *s; unsigned int max_sessions; - int ret, err = 0; + int i, ret, err = 0; spin_lock(&ci->i_unsafe_lock); if (S_ISDIR(inode->i_mode) && !list_empty(&ci->i_unsafe_dirops)) { @@ -2315,28 +2317,19 @@ static int flush_mdlog_and_wait_inode_unsafe_requests(struct inode *inode) } spin_unlock(&ci->i_unsafe_lock); - /* - * The mdsc->max_sessions is unlikely to be changed - * mostly, here we will retry it by reallocating the - * sessions array memory to get rid of the mdsc->mutex - * lock. - */ -retry: - max_sessions = mdsc->max_sessions; - /* * Trigger to flush the journal logs in all the relevant MDSes * manually, or in the worst case we must wait at most 5 seconds * to wait the journal logs to be flushed by the MDSes periodically. */ - if ((req1 || req2) && likely(max_sessions)) { - struct ceph_mds_session **sessions = NULL; - struct ceph_mds_session *s; + mutex_lock(&mdsc->mutex); + max_sessions = mdsc->max_sessions; + if (req1 || req2) { struct ceph_mds_request *req; - int i; sessions = kcalloc(max_sessions, sizeof(s), GFP_KERNEL); if (!sessions) { + mutex_unlock(&mdsc->mutex); err = -ENOMEM; goto out; } @@ -2346,18 +2339,8 @@ static int flush_mdlog_and_wait_inode_unsafe_requests(struct inode *inode) list_for_each_entry(req, &ci->i_unsafe_dirops, r_unsafe_dir_item) { s = req->r_session; - if (!s) + if (!s || unlikely(s->s_mds >= max_sessions)) continue; - if (unlikely(s->s_mds >= max_sessions)) { - spin_unlock(&ci->i_unsafe_lock); - for (i = 0; i < max_sessions; i++) { - s = sessions[i]; - if (s) - ceph_put_mds_session(s); - } - kfree(sessions); - goto retry; - } if (!sessions[s->s_mds]) { s = ceph_get_mds_session(s); sessions[s->s_mds] = s; @@ -2368,18 +2351,8 @@ static int flush_mdlog_and_wait_inode_unsafe_requests(struct inode *inode) list_for_each_entry(req, &ci->i_unsafe_iops, r_unsafe_target_item) { s = req->r_session; - if (!s) + if (!s || unlikely(s->s_mds >= max_sessions)) continue; - if (unlikely(s->s_mds >= max_sessions)) { - spin_unlock(&ci->i_unsafe_lock); - for (i = 0; i < max_sessions; i++) { - s = sessions[i]; - if (s) - ceph_put_mds_session(s); - } - kfree(sessions); - goto retry; - } if (!sessions[s->s_mds]) { s = ceph_get_mds_session(s); sessions[s->s_mds] = s; @@ -2391,13 +2364,18 @@ static int flush_mdlog_and_wait_inode_unsafe_requests(struct inode *inode) /* the auth MDS */ spin_lock(&ci->i_ceph_lock); if (ci->i_auth_cap) { - s = ci->i_auth_cap->session; - if (!sessions[s->s_mds]) - sessions[s->s_mds] = ceph_get_mds_session(s); + s = ci->i_auth_cap->session; + if (likely(s->s_mds < max_sessions) + && !sessions[s->s_mds]) { + sessions[s->s_mds] = ceph_get_mds_session(s); + } } spin_unlock(&ci->i_ceph_lock); + } + mutex_unlock(&mdsc->mutex); - /* send flush mdlog request to MDSes */ + /* send flush mdlog request to MDSes */ + if (sessions) { for (i = 0; i < max_sessions; i++) { s = sessions[i]; if (s) { @@ -2405,7 +2383,6 @@ static int flush_mdlog_and_wait_inode_unsafe_requests(struct inode *inode) ceph_put_mds_session(s); } } - kfree(sessions); } dout("%s %p wait on tid %llu %llu\n", __func__, @@ -2424,6 +2401,7 @@ static int flush_mdlog_and_wait_inode_unsafe_requests(struct inode *inode) } out: + kfree(sessions); if (req1) ceph_mdsc_put_request(req1); if (req2) -- 2.31.1
