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ceph: exclude setfilelock requests when calculating oldest tid 

setfilelock requests can block for a long time, which can prevent
client from advancing its oldest tid.

Signed-off-by: Yan, Zheng <zyan@redhat.com>
This commit is contained in:
Yan, Zheng 2015-05-19 18:54:40 +08:00 committed by Ilya Dryomov
parent 745a8e3bcc
commit e8a7b8b12b
2 changed files with 25 additions and 7 deletions
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30
fs/ceph/mds_client.c
View File

@ -628,6 +628,9 @@ static void __register_request(struct ceph_mds_client *mdsc,
req->r_uid = current_fsuid();
req->r_gid = current_fsgid();
if (mdsc->oldest_tid == 0 && req->r_op != CEPH_MDS_OP_SETFILELOCK)
mdsc->oldest_tid = req->r_tid;
if (dir) {
struct ceph_inode_info *ci = ceph_inode(dir);
@ -643,6 +646,21 @@ static void __unregister_request(struct ceph_mds_client *mdsc,
struct ceph_mds_request *req)
{
dout("__unregister_request %p tid %lld\n", req, req->r_tid);
if (req->r_tid == mdsc->oldest_tid) {
struct rb_node *p = rb_next(&req->r_node);
mdsc->oldest_tid = 0;
while (p) {
struct ceph_mds_request *next_req =
rb_entry(p, struct ceph_mds_request, r_node);
if (next_req->r_op != CEPH_MDS_OP_SETFILELOCK) {
mdsc->oldest_tid = next_req->r_tid;
break;
}
p = rb_next(p);
}
}
rb_erase(&req->r_node, &mdsc->request_tree);
RB_CLEAR_NODE(&req->r_node);
@ -1682,13 +1700,9 @@ static struct ceph_mds_request *__get_oldest_req(struct ceph_mds_client *mdsc)
struct ceph_mds_request, r_node);
}
static u64 __get_oldest_tid(struct ceph_mds_client *mdsc)
static inline u64 __get_oldest_tid(struct ceph_mds_client *mdsc)
{
struct ceph_mds_request *req = __get_oldest_req(mdsc);
if (req)
return req->r_tid;
return 0;
return mdsc->oldest_tid;
}
/*
@ -3378,6 +3392,7 @@ int ceph_mdsc_init(struct ceph_fs_client *fsc)
INIT_LIST_HEAD(&mdsc->snap_empty);
spin_lock_init(&mdsc->snap_empty_lock);
mdsc->last_tid = 0;
mdsc->oldest_tid = 0;
mdsc->request_tree = RB_ROOT;
INIT_DELAYED_WORK(&mdsc->delayed_work, delayed_work);
mdsc->last_renew_caps = jiffies;
@ -3471,7 +3486,8 @@ restart:
nextreq = rb_entry(n, struct ceph_mds_request, r_node);
else
nextreq = NULL;
if ((req->r_op & CEPH_MDS_OP_WRITE)) {
if (req->r_op != CEPH_MDS_OP_SETFILELOCK &&
(req->r_op & CEPH_MDS_OP_WRITE)) {
/* write op */
ceph_mdsc_get_request(req);
if (nextreq)

2
fs/ceph/mds_client.h
View File

@ -296,6 +296,8 @@ struct ceph_mds_client {
spinlock_t snap_empty_lock; /* protect snap_empty */
u64 last_tid; /* most recent mds request */
u64 oldest_tid; /* oldest incomplete mds request,
excluding setfilelock requests */
struct rb_root request_tree; /* pending mds requests */
struct delayed_work delayed_work; /* delayed work */
unsigned long last_renew_caps; /* last time we renewed our caps */