int osc_object_is_contended(struct osc_object *obj)
{
struct osc_device *dev = lu2osc_dev(obj->oo_cl.co_lu.lo_dev);
int osc_contention_time = dev->od_contention_time;
unsigned long cur_time = cfs_time_current();
unsigned long retry_time;
if (OBD_FAIL_CHECK(OBD_FAIL_OSC_OBJECT_CONTENTION))
return 1;
if (!obj->oo_contended)
return 0;
/*
* I like copy-paste. the code is copied from
* ll_file_is_contended.
*/
retry_time = cfs_time_add(obj->oo_contention_time,
cfs_time_seconds(osc_contention_time));
if (cfs_time_after(cur_time, retry_time)) {
osc_object_clear_contended(obj);
return 0;
}
return 1;
}
static void osc_io_setattr_end(const struct lu_env *env,
const struct cl_io_slice *slice)
{
struct cl_io *io = slice->cis_io;
struct osc_io *oio = cl2osc_io(env, slice);
struct cl_object *obj = slice->cis_obj;
struct osc_async_cbargs *cbargs = &oio->oi_cbarg;
int result = 0;
if (cbargs->opc_rpc_sent) {
wait_for_completion(&cbargs->opc_sync);
result = io->ci_result = cbargs->opc_rc;
}
if (result == 0) {
if (oio->oi_lockless) {
/* lockless truncate */
struct osc_device *osd = lu2osc_dev(obj->co_lu.lo_dev);
LASSERT(cl_io_is_trunc(io));
/* XXX: Need a lock. */
osd->od_stats.os_lockless_truncates++;
}
}
if (cl_io_is_trunc(io)) {
__u64 size = io->u.ci_setattr.sa_attr.lvb_size;
osc_trunc_check(env, io, oio, size);
if (oio->oi_trunc != NULL) {
osc_cache_truncate_end(env, oio, cl2osc(obj));
oio->oi_trunc = NULL;
}
}
}
/**
* Implements cl_io_operations::cio_prepare_write() method for osc layer.
*
* \retval -EIO transfer initiated against this osc will most likely fail
* \retval 0 transfer initiated against this osc will most likely succeed.
*
* The reason for this check is to immediately return an error to the caller
* in the case of a deactivated import. Note, that import can be deactivated
* later, while pages, dirtied by this IO, are still in the cache, but this is
* irrelevant, because that would still return an error to the application (if
* it does fsync), but many applications don't do fsync because of performance
* issues, and we wanted to return an -EIO at write time to notify the
* application.
*/
static int osc_io_prepare_write(const struct lu_env *env,
const struct cl_io_slice *ios,
const struct cl_page_slice *slice,
unsigned from, unsigned to)
{
struct osc_device *dev = lu2osc_dev(slice->cpl_obj->co_lu.lo_dev);
struct obd_import *imp = class_exp2cliimp(dev->od_exp);
struct osc_io *oio = cl2osc_io(env, ios);
int result = 0;
/*
* This implements OBD_BRW_CHECK logic from old client.
*/
if (imp == NULL || imp->imp_invalid)
result = -EIO;
if (result == 0 && oio->oi_lockless)
/* this page contains `invalid' data, but who cares?
* nobody can access the invalid data.
* in osc_io_commit_write(), we're going to write exact
* [from, to) bytes of this page to OST. -jay */
cl_page_export(env, slice->cpl_page, 1);
return result;
}
static struct lu_device *osc_device_free(const struct lu_env *env,
struct lu_device *d)
{
struct osc_device *od = lu2osc_dev(d);
cl_device_fini(lu2cl_dev(d));
kfree(od);
return NULL;
}
