struct lu_object *osc_object_alloc(const struct lu_env *env,
const struct lu_object_header *unused,
struct lu_device *dev)
{
struct osc_object *osc;
struct lu_object *obj;
OBD_SLAB_ALLOC_PTR_GFP(osc, osc_object_kmem, GFP_NOFS);
if (osc != NULL) {
obj = osc2lu(osc);
lu_object_init(obj, NULL, dev);
osc->oo_cl.co_ops = &osc_ops;
obj->lo_ops = &osc_lu_obj_ops;
} else
obj = NULL;
return obj;
}
struct lu_object *osc_object_alloc(const struct lu_env *env,
const struct lu_object_header *unused,
struct lu_device *dev)
{
struct osc_object *osc;
struct lu_object *obj;
osc = kmem_cache_zalloc(osc_object_kmem, GFP_NOFS);
if (osc) {
obj = osc2lu(osc);
lu_object_init(obj, NULL, dev);
osc->oo_cl.co_ops = &osc_ops;
obj->lo_ops = &osc_lu_obj_ops;
} else {
obj = NULL;
}
return obj;
}
/**
* Finds an existing lock covering a page with given index.
* Copy of osc_obj_dlmlock_at_pgoff() but for DoM IBITS lock.
*/
struct ldlm_lock *mdc_dlmlock_at_pgoff(const struct lu_env *env,
struct osc_object *obj, pgoff_t index,
enum osc_dap_flags dap_flags)
{
struct osc_thread_info *info = osc_env_info(env);
struct ldlm_res_id *resname = &info->oti_resname;
union ldlm_policy_data *policy = &info->oti_policy;
struct lustre_handle lockh;
struct ldlm_lock *lock = NULL;
enum ldlm_mode mode;
__u64 flags;
ENTRY;
fid_build_reg_res_name(lu_object_fid(osc2lu(obj)), resname);
mdc_lock_build_policy(env, policy);
flags = LDLM_FL_BLOCK_GRANTED | LDLM_FL_CBPENDING;
if (dap_flags & OSC_DAP_FL_TEST_LOCK)
flags |= LDLM_FL_TEST_LOCK;
again:
/* Next, search for already existing extent locks that will cover us */
/* If we're trying to read, we also search for an existing PW lock. The
* VFS and page cache already protect us locally, so lots of readers/
* writers can share a single PW lock. */
mode = mdc_dom_lock_match(env, osc_export(obj), resname, LDLM_IBITS,
policy, LCK_PR | LCK_PW, &flags, obj, &lockh,
dap_flags & OSC_DAP_FL_CANCELING);
if (mode != 0) {
lock = ldlm_handle2lock(&lockh);
/* RACE: the lock is cancelled so let's try again */
if (unlikely(lock == NULL))
goto again;
}
RETURN(lock);
}
