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-rw-r--r--fs/ceph/caps.c55
1 files changed, 37 insertions, 18 deletions
diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c
index 7d305b974824..b472cd066d1c 100644
--- a/fs/ceph/caps.c
+++ b/fs/ceph/caps.c
@@ -2218,6 +2218,7 @@ static int unsafe_request_wait(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;
+ unsigned int max_sessions;
int ret, err = 0;
spin_lock(&ci->i_unsafe_lock);
@@ -2236,36 +2237,44 @@ static int unsafe_request_wait(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) {
+ if ((req1 || req2) && likely(max_sessions)) {
struct ceph_mds_session **sessions = NULL;
struct ceph_mds_session *s;
struct ceph_mds_request *req;
- unsigned int max;
int i;
- /*
- * The mdsc->max_sessions is unlikely to be changed
- * mostly, here we will retry it by reallocating the
- * sessions arrary memory to get rid of the mdsc->mutex
- * lock.
- */
-retry:
- max = mdsc->max_sessions;
- sessions = krealloc(sessions, max * sizeof(s), __GFP_ZERO);
- if (!sessions)
- return -ENOMEM;
+ sessions = kzalloc(max_sessions * sizeof(s), GFP_KERNEL);
+ if (!sessions) {
+ err = -ENOMEM;
+ goto out;
+ }
spin_lock(&ci->i_unsafe_lock);
if (req1) {
list_for_each_entry(req, &ci->i_unsafe_dirops,
r_unsafe_dir_item) {
s = req->r_session;
- if (unlikely(s->s_mds >= max)) {
+ 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]) {
@@ -2278,8 +2287,14 @@ retry:
list_for_each_entry(req, &ci->i_unsafe_iops,
r_unsafe_target_item) {
s = req->r_session;
- if (unlikely(s->s_mds >= max)) {
+ 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]) {
@@ -2300,7 +2315,7 @@ retry:
spin_unlock(&ci->i_ceph_lock);
/* send flush mdlog request to MDSes */
- for (i = 0; i < max; i++) {
+ for (i = 0; i < max_sessions; i++) {
s = sessions[i];
if (s) {
send_flush_mdlog(s);
@@ -2317,15 +2332,19 @@ retry:
ceph_timeout_jiffies(req1->r_timeout));
if (ret)
err = -EIO;
- ceph_mdsc_put_request(req1);
}
if (req2) {
ret = !wait_for_completion_timeout(&req2->r_safe_completion,
ceph_timeout_jiffies(req2->r_timeout));
if (ret)
err = -EIO;
- ceph_mdsc_put_request(req2);
}
+
+out:
+ if (req1)
+ ceph_mdsc_put_request(req1);
+ if (req2)
+ ceph_mdsc_put_request(req2);
return err;
}