LU-3027 lov: to not modify lov lock when sublock is canceled

[fs/lustre-release.git] / lustre / lov / lovsub_lock.c

diff --git a/lustre/lov/lovsub_lock.c b/lustre/lov/lovsub_lock.c
index a76acf2..22f35e6 100644 (file)
--- a/lustre/lov/lovsub_lock.c
+++ b/lustre/lov/lovsub_lock.c
@@ -66,26 +66,26 @@ static void lovsub_lock_fini(const struct lu_env *env,
 
 static void lovsub_parent_lock(const struct lu_env *env, struct lov_lock *lov)
 {
-        struct cl_lock *parent;
-
-        ENTRY;
-        parent = lov->lls_cl.cls_lock;
-        cl_lock_get(parent);
-        lu_ref_add(&parent->cll_reference, "lovsub-parent", cfs_current());
-        cl_lock_mutex_get(env, parent);
-        EXIT;
+       struct cl_lock *parent;
+
+       ENTRY;
+       parent = lov->lls_cl.cls_lock;
+       cl_lock_get(parent);
+       lu_ref_add(&parent->cll_reference, "lovsub-parent", current);
+       cl_lock_mutex_get(env, parent);
+       EXIT;
 }
 
 static void lovsub_parent_unlock(const struct lu_env *env, struct lov_lock *lov)
 {
-        struct cl_lock *parent;
-
-        ENTRY;
-        parent = lov->lls_cl.cls_lock;
-        cl_lock_mutex_put(env, lov->lls_cl.cls_lock);
-        lu_ref_del(&parent->cll_reference, "lovsub-parent", cfs_current());
-        cl_lock_put(env, parent);
-        EXIT;
+       struct cl_lock *parent;
+
+       ENTRY;
+       parent = lov->lls_cl.cls_lock;
+       cl_lock_mutex_put(env, lov->lls_cl.cls_lock);
+       lu_ref_del(&parent->cll_reference, "lovsub-parent", current);
+       cl_lock_put(env, parent);
+       EXIT;
 }
 
 /**
@@ -220,7 +220,14 @@ int lov_sublock_modify(const struct lu_env *env, struct lov_lock *lov,
         pd->cld_mode = parent_descr->cld_mode;
         pd->cld_gid  = parent_descr->cld_gid;
         lovsub_lock_descr_map(d, subobj->lso_super, subobj->lso_index, pd);
-        lov->lls_sub[idx].sub_got = *d;
+
+       /* LU-3027: only update extent of lock, plus the change in
+        * lovsub_lock_delete() that lock extent is modified after a sublock
+        * is canceled, we can make sure that the lock extent won't be updated
+        * any more. Therefore, lov_lock_fits_into() will always find feasible
+        * locks */
+        lov->lls_sub[idx].sub_got.cld_start = d->cld_start;
+        lov->lls_sub[idx].sub_got.cld_end = d->cld_end;
         /*
          * Notify top-lock about modification, if lock description changes
          * materially.
@@ -297,6 +304,7 @@ static int lovsub_lock_delete_one(const struct lu_env *env,
                 RETURN(0);
 
         result = 0;
+       lov->lls_ever_canceled = 1;
         switch (parent->cll_state) {
        case CLS_ENQUEUED:
                /* See LU-1355 for the case that a glimpse lock is
@@ -380,6 +388,7 @@ static int lovsub_lock_delete_one(const struct lu_env *env,
                 break;
         case CLS_HELD:
                 CL_LOCK_DEBUG(D_ERROR, env, parent, "Delete CLS_HELD lock\n");
+               /* falling through */
         default:
                 CERROR("Impossible state: %d\n", parent->cll_state);
                 LBUG();
@@ -415,15 +424,12 @@ static void lovsub_lock_delete(const struct lu_env *env,
                 struct lov_lock      *lov;
                 struct lov_lock_link *scan;
                 struct lov_lock_link *temp;
-                struct lov_lock_sub  *subdata;
 
                 restart = 0;
                 cfs_list_for_each_entry_safe(scan, temp,
                                              &sub->lss_parents, lll_list) {
                         lov     = scan->lll_super;
-                        subdata = &lov->lls_sub[scan->lll_idx];
                         lovsub_parent_lock(env, lov);
-                        subdata->sub_got = subdata->sub_descr;
                         lov_lock_unlink(env, scan, sub);
                         restart = lovsub_lock_delete_one(env, child, lov);
                         lovsub_parent_unlock(env, lov);
@@ -472,7 +478,7 @@ int lovsub_lock_init(const struct lu_env *env, struct cl_object *obj,
         int result;
 
         ENTRY;
-        OBD_SLAB_ALLOC_PTR_GFP(lsk, lovsub_lock_kmem, CFS_ALLOC_IO);
+       OBD_SLAB_ALLOC_PTR_GFP(lsk, lovsub_lock_kmem, __GFP_IO);
         if (lsk != NULL) {
                 CFS_INIT_LIST_HEAD(&lsk->lss_parents);
                 cl_lock_slice_add(lock, &lsk->lss_cl, obj, &lovsub_lock_ops);