diff options
| -rw-r--r-- | fs/ceph/caps.c | 61 | ||||
| -rw-r--r-- | fs/ceph/mds_client.c | 24 | ||||
| -rw-r--r-- | fs/ceph/mds_client.h | 3 | ||||
| -rw-r--r-- | fs/ceph/super.h | 2 |
4 files changed, 74 insertions, 16 deletions
diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c index 1726ddcf5e34..8e66fb0e743d 100644 --- a/fs/ceph/caps.c +++ b/fs/ceph/caps.c @@ -154,13 +154,19 @@ void ceph_adjust_min_caps(struct ceph_mds_client *mdsc, int delta) spin_unlock(&mdsc->caps_list_lock); } -void ceph_reserve_caps(struct ceph_mds_client *mdsc, +/* + * Called under mdsc->mutex. + */ +int ceph_reserve_caps(struct ceph_mds_client *mdsc, struct ceph_cap_reservation *ctx, int need) { - int i; + int i, j; struct ceph_cap *cap; int have; int alloc = 0; + int max_caps; + bool trimmed = false; + struct ceph_mds_session *s; LIST_HEAD(newcaps); dout("reserve caps ctx=%p need=%d\n", ctx, need); @@ -179,16 +185,37 @@ void ceph_reserve_caps(struct ceph_mds_client *mdsc, spin_unlock(&mdsc->caps_list_lock); for (i = have; i < need; i++) { +retry: cap = kmem_cache_alloc(ceph_cap_cachep, GFP_NOFS); - if (!cap) - break; + if (!cap) { + if (!trimmed) { + for (j = 0; j < mdsc->max_sessions; j++) { + s = __ceph_lookup_mds_session(mdsc, j); + if (!s) + continue; + mutex_unlock(&mdsc->mutex); + + mutex_lock(&s->s_mutex); + max_caps = s->s_nr_caps - (need - i); + ceph_trim_caps(mdsc, s, max_caps); + mutex_unlock(&s->s_mutex); + + ceph_put_mds_session(s); + mutex_lock(&mdsc->mutex); + } + trimmed = true; + goto retry; + } else { + pr_warn("reserve caps ctx=%p ENOMEM " + "need=%d got=%d\n", + ctx, need, have + alloc); + goto out_nomem; + } + } list_add(&cap->caps_item, &newcaps); alloc++; } - /* we didn't manage to reserve as much as we needed */ - if (have + alloc != need) - pr_warn("reserve caps ctx=%p ENOMEM need=%d got=%d\n", - ctx, need, have + alloc); + BUG_ON(have + alloc != need); spin_lock(&mdsc->caps_list_lock); mdsc->caps_total_count += alloc; @@ -204,6 +231,24 @@ void ceph_reserve_caps(struct ceph_mds_client *mdsc, dout("reserve caps ctx=%p %d = %d used + %d resv + %d avail\n", ctx, mdsc->caps_total_count, mdsc->caps_use_count, mdsc->caps_reserve_count, mdsc->caps_avail_count); + return 0; + +out_nomem: + while (!list_empty(&newcaps)) { + cap = list_first_entry(&newcaps, + struct ceph_cap, caps_item); + list_del(&cap->caps_item); + kmem_cache_free(ceph_cap_cachep, cap); + } + + spin_lock(&mdsc->caps_list_lock); + mdsc->caps_avail_count += have; + mdsc->caps_reserve_count -= have; + BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count + + mdsc->caps_reserve_count + + mdsc->caps_avail_count); + spin_unlock(&mdsc->caps_list_lock); + return -ENOMEM; } int ceph_unreserve_caps(struct ceph_mds_client *mdsc, diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c index 251dc44d84a0..2e8f90f96540 100644 --- a/fs/ceph/mds_client.c +++ b/fs/ceph/mds_client.c @@ -604,10 +604,20 @@ static void __register_request(struct ceph_mds_client *mdsc, struct ceph_mds_request *req, struct inode *dir) { + int ret = 0; + req->r_tid = ++mdsc->last_tid; - if (req->r_num_caps) - ceph_reserve_caps(mdsc, &req->r_caps_reservation, - req->r_num_caps); + if (req->r_num_caps) { + ret = ceph_reserve_caps(mdsc, &req->r_caps_reservation, + req->r_num_caps); + if (ret < 0) { + pr_err("__register_request %p " + "failed to reserve caps: %d\n", req, ret); + /* set req->r_err to fail early from __do_request */ + req->r_err = ret; + return; + } + } dout("__register_request %p tid %lld\n", req, req->r_tid); ceph_mdsc_get_request(req); insert_request(&mdsc->request_tree, req); @@ -1545,9 +1555,9 @@ out: /* * Trim session cap count down to some max number. */ -static int trim_caps(struct ceph_mds_client *mdsc, - struct ceph_mds_session *session, - int max_caps) +int ceph_trim_caps(struct ceph_mds_client *mdsc, + struct ceph_mds_session *session, + int max_caps) { int trim_caps = session->s_nr_caps - max_caps; @@ -2776,7 +2786,7 @@ static void handle_session(struct ceph_mds_session *session, break; case CEPH_SESSION_RECALL_STATE: - trim_caps(mdsc, session, le32_to_cpu(h->max_caps)); + ceph_trim_caps(mdsc, session, le32_to_cpu(h->max_caps)); break; case CEPH_SESSION_FLUSHMSG: diff --git a/fs/ceph/mds_client.h b/fs/ceph/mds_client.h index 837ac4b087a0..71e3b783ee6f 100644 --- a/fs/ceph/mds_client.h +++ b/fs/ceph/mds_client.h @@ -444,4 +444,7 @@ ceph_mdsc_open_export_target_session(struct ceph_mds_client *mdsc, int target); extern void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client *mdsc, struct ceph_mds_session *session); +extern int ceph_trim_caps(struct ceph_mds_client *mdsc, + struct ceph_mds_session *session, + int max_caps); #endif diff --git a/fs/ceph/super.h b/fs/ceph/super.h index 601100da738f..21b2e5b004eb 100644 --- a/fs/ceph/super.h +++ b/fs/ceph/super.h @@ -649,7 +649,7 @@ extern int __ceph_caps_mds_wanted(struct ceph_inode_info *ci, bool check); extern void ceph_caps_init(struct ceph_mds_client *mdsc); extern void ceph_caps_finalize(struct ceph_mds_client *mdsc); extern void ceph_adjust_min_caps(struct ceph_mds_client *mdsc, int delta); -extern void ceph_reserve_caps(struct ceph_mds_client *mdsc, +extern int ceph_reserve_caps(struct ceph_mds_client *mdsc, struct ceph_cap_reservation *ctx, int need); extern int ceph_unreserve_caps(struct ceph_mds_client *mdsc, struct ceph_cap_reservation *ctx); |