* Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
* Use is subject to license terms.
*
- * Copyright (c) 2011 Whamcloud, Inc.
+ * Copyright (c) 2012, Intel Corporation.
*
*/
/*
struct client_obd *cli = osc_cli(ext->oe_obj);
struct osc_async_page *oap;
struct osc_async_page *tmp;
- struct osc_async_page *last = NULL;
int nr_pages = ext->oe_nr_pages;
int lost_grant = 0;
int blocksize = cli->cl_import->imp_obd->obd_osfs.os_bsize ? : 4096;
+ __u64 last_off = 0;
+ int last_count = -1;
ENTRY;
OSC_EXTENT_DUMP(D_CACHE, ext, "extent finished.\n");
oap_pending_item) {
cfs_list_del_init(&oap->oap_rpc_item);
cfs_list_del_init(&oap->oap_pending_item);
- if (last == NULL || last->oap_obj_off < oap->oap_obj_off)
- last = oap;
+ if (last_off <= oap->oap_obj_off) {
+ last_off = oap->oap_obj_off;
+ last_count = oap->oap_count;
+ }
--ext->oe_nr_pages;
osc_ap_completion(env, cli, oap, sent, rc);
if (!sent) {
lost_grant = ext->oe_grants;
} else if (blocksize < CFS_PAGE_SIZE &&
- last->oap_count != CFS_PAGE_SIZE) {
+ last_count != CFS_PAGE_SIZE) {
/* For short writes we shouldn't count parts of pages that
* span a whole chunk on the OST side, or our accounting goes
* wrong. Should match the code in filter_grant_check. */
rc = osc_make_ready(env, oap, OBD_BRW_WRITE);
switch (rc) {
case 0:
- cfs_spin_lock(&oap->oap_lock);
+ spin_lock(&oap->oap_lock);
oap->oap_async_flags |= ASYNC_READY;
- cfs_spin_unlock(&oap->oap_lock);
+ spin_unlock(&oap->oap_lock);
break;
case -EALREADY:
LASSERT((oap->oap_async_flags & ASYNC_READY) != 0);
/* Clear opg->ops_transfer_pinned before VM lock is released. */
opg->ops_transfer_pinned = 0;
- cfs_spin_lock(&obj->oo_seatbelt);
+ spin_lock(&obj->oo_seatbelt);
LASSERT(opg->ops_submitter != NULL);
LASSERT(!cfs_list_empty(&opg->ops_inflight));
cfs_list_del_init(&opg->ops_inflight);
opg->ops_submitter = NULL;
- cfs_spin_unlock(&obj->oo_seatbelt);
+ spin_unlock(&obj->oo_seatbelt);
opg->ops_submit_time = 0;
srvlock = oap->oap_brw_flags & OBD_BRW_SRVLOCK;
- cl_page_completion(env, page, crt, rc);
-
/* statistic */
if (rc == 0 && srvlock) {
struct lu_device *ld = opg->ops_cl.cpl_obj->co_lu.lo_dev;
* reference counter protects page from concurrent reclaim.
*/
lu_ref_del(&page->cp_reference, "transfer", page);
- /*
- * As page->cp_obj is pinned by a reference from page->cp_req, it is
- * safe to call cl_page_put() without risking object destruction in a
- * non-blocking context.
- */
- cl_page_put(env, page);
+
+ cl_page_completion(env, page, crt, rc);
+
RETURN(0);
}
} else {
cli->cl_avail_grant += unused;
}
- if (unused > 0)
- osc_wake_cache_waiters(cli);
}
void osc_unreserve_grant(struct client_obd *cli,
{
client_obd_list_lock(&cli->cl_loi_list_lock);
__osc_unreserve_grant(cli, reserved, unused);
+ if (unused > 0)
+ osc_wake_cache_waiters(cli);
client_obd_list_unlock(&cli->cl_loi_list_lock);
}
cli->cl_avail_grant, cli->cl_dirty);
}
-/* The companion to osc_enter_cache(), called when @oap is no longer part of
- * the dirty accounting. Writeback completes or truncate happens before
- * writing starts. Must be called with the loi lock held. */
+/**
+ * The companion to osc_enter_cache(), called when @oap is no longer part of
+ * the dirty accounting due to error.
+ */
static void osc_exit_cache(struct client_obd *cli, struct osc_async_page *oap)
{
+ client_obd_list_lock(&cli->cl_loi_list_lock);
osc_release_write_grant(cli, &oap->oap_brw_page);
+ client_obd_list_unlock(&cli->cl_loi_list_lock);
}
/**
return rc;
}
-/* Caller must hold loi_list_lock - we drop/regain it if we need to wait for
- * grant or cache space. */
+static int ocw_granted(struct client_obd *cli, struct osc_cache_waiter *ocw)
+{
+ int rc;
+ client_obd_list_lock(&cli->cl_loi_list_lock);
+ rc = cfs_list_empty(&ocw->ocw_entry) || cli->cl_w_in_flight == 0;
+ client_obd_list_unlock(&cli->cl_loi_list_lock);
+ return rc;
+}
+
+/**
+ * The main entry to reserve dirty page accounting. Usually the grant reserved
+ * in this function will be freed in bulk in osc_free_grant() unless it fails
+ * to add osc cache, in that case, it will be freed in osc_exit_cache().
+ *
+ * The process will be put into sleep if it's already run out of grant.
+ */
static int osc_enter_cache(const struct lu_env *env, struct client_obd *cli,
struct osc_async_page *oap, int bytes)
{
cfs_waitq_init(&ocw.ocw_waitq);
ocw.ocw_oap = oap;
ocw.ocw_grant = bytes;
- while (cli->cl_dirty > 0 || cli->cl_w_in_flight > 0) {
+ if (cli->cl_dirty > 0 || cli->cl_w_in_flight > 0) {
cfs_list_add_tail(&ocw.ocw_entry, &cli->cl_cache_waiters);
ocw.ocw_rc = 0;
client_obd_list_unlock(&cli->cl_loi_list_lock);
+ /* First osc_io_unplug() tries to put current object
+ * on ready list, second osc_io_unplug() makes sure that
+ * dirty flush can still be triggered even if current
+ * object hasn't any dirty pages */
osc_io_unplug(env, cli, osc, PDL_POLICY_ROUND);
+ osc_io_unplug(env, cli, NULL, PDL_POLICY_ROUND);
CDEBUG(D_CACHE, "%s: sleeping for cache space @ %p for %p\n",
cli->cl_import->imp_obd->obd_name, &ocw, oap);
- rc = l_wait_event(ocw.ocw_waitq,
- cfs_list_empty(&ocw.ocw_entry), &lwi);
+ rc = l_wait_event(ocw.ocw_waitq, ocw_granted(cli, &ocw), &lwi);
client_obd_list_lock(&cli->cl_loi_list_lock);
- cfs_list_del_init(&ocw.ocw_entry);
- if (rc < 0)
- break;
- rc = ocw.ocw_rc;
+ /* l_wait_event is interrupted by signal */
+ if (rc < 0) {
+ cfs_list_del_init(&ocw.ocw_entry);
+ GOTO(out, rc);
+ }
+
+ /* If ocw_entry isn't empty, which means it's not waked up
+ * by osc_wake_cache_waiters(), then the page must not be
+ * granted yet. */
+ if (!cfs_list_empty(&ocw.ocw_entry)) {
+ rc = -EDQUOT;
+ cfs_list_del_init(&ocw.ocw_entry);
+ } else {
+ rc = ocw.ocw_rc;
+ }
+
if (rc != -EDQUOT)
- break;
- if (osc_enter_cache_try(cli, oap, bytes, 0)) {
+ GOTO(out, rc);
+ if (osc_enter_cache_try(cli, oap, bytes, 0))
rc = 0;
- break;
- }
}
EXIT;
-
out:
client_obd_list_unlock(&cli->cl_loi_list_lock);
OSC_DUMP_GRANT(cli, "returned %d.\n", rc);
}
/* As the transfer for this page is being done, clear the flags */
- cfs_spin_lock(&oap->oap_lock);
+ spin_lock(&oap->oap_lock);
oap->oap_async_flags = 0;
- cfs_spin_unlock(&oap->oap_lock);
+ spin_unlock(&oap->oap_lock);
oap->oap_interrupted = 0;
if (oap->oap_cmd & OBD_BRW_WRITE && xid > 0) {
CFS_INIT_LIST_HEAD(&oap->oap_pending_item);
CFS_INIT_LIST_HEAD(&oap->oap_rpc_item);
- cfs_spin_lock_init(&oap->oap_lock);
+ spin_lock_init(&oap->oap_lock);
CDEBUG(D_INFO, "oap %p page %p obj off "LPU64"\n",
oap, page, oap->oap_obj_off);
RETURN(0);
struct cl_page *cp = ops->ops_cl.cpl_page;
pgoff_t index = cp->cp_index;
struct osc_async_page *oap = &ops->ops_oap;
- int unplug = 0;
+ bool unplug = false;
int rc = 0;
ENTRY;
if (rc)
GOTO(out, rc);
- cfs_spin_lock(&oap->oap_lock);
+ spin_lock(&oap->oap_lock);
oap->oap_async_flags |= ASYNC_READY|ASYNC_URGENT;
- cfs_spin_unlock(&oap->oap_lock);
+ spin_unlock(&oap->oap_lock);
if (cfs_memory_pressure_get())
ext->oe_memalloc = 1;
ext->oe_urgent = 1;
- if (ext->oe_state == OES_CACHE && cfs_list_empty(&ext->oe_link)) {
+ if (ext->oe_state == OES_CACHE) {
OSC_EXTENT_DUMP(D_CACHE, ext,
"flush page %p make it urgent.\n", oap);
- cfs_list_add_tail(&ext->oe_link, &obj->oo_urgent_exts);
- unplug = 1;
+ if (cfs_list_empty(&ext->oe_link))
+ cfs_list_add_tail(&ext->oe_link, &obj->oo_urgent_exts);
+ unplug = true;
}
rc = 0;
EXIT;
break;
}
+ OSC_EXTENT_DUMP(D_CACHE, ext, "try to trunc:"LPU64".\n", size);
+
osc_extent_get(ext);
if (ext->oe_state == OES_ACTIVE) {
/* though we grab inode mutex for write path, but we
osc_extent_put(env, ext);
}
if (waiting != NULL) {
- if (result == 0)
- result = osc_extent_wait(env, waiting, OES_INV);
+ int rc;
+
+ /* ignore the result of osc_extent_wait the write initiator
+ * should take care of it. */
+ rc = osc_extent_wait(env, waiting, OES_INV);
+ if (rc < 0)
+ OSC_EXTENT_DUMP(D_CACHE, ext, "wait error: %d.\n", rc);
osc_extent_put(env, waiting);
waiting = NULL;
- if (result == 0)
- goto again;
+ goto again;
}
RETURN(result);
}
oio->oi_trunc = NULL;
if (ext != NULL) {
+ bool unplug = false;
+
EASSERT(ext->oe_nr_pages > 0, ext);
EASSERT(ext->oe_state == OES_TRUNC, ext);
EASSERT(!ext->oe_urgent, ext);
if (ext->oe_fsync_wait && !ext->oe_urgent) {
ext->oe_urgent = 1;
cfs_list_move_tail(&ext->oe_link, &obj->oo_urgent_exts);
+ unplug = true;
}
osc_update_pending(obj, OBD_BRW_WRITE, ext->oe_nr_pages);
osc_object_unlock(obj);
osc_extent_put(env, ext);
- osc_list_maint(osc_cli(obj), obj);
+ if (unplug)
+ osc_io_unplug_async(env, osc_cli(obj), obj);
}
}
{
struct osc_extent *ext;
CFS_LIST_HEAD(discard_list);
- int unplug = 0;
+ bool unplug = false;
int result = 0;
ENTRY;
ext->oe_urgent = 1;
list = &obj->oo_urgent_exts;
}
- if (list != NULL) {
+ if (list != NULL)
cfs_list_move_tail(&ext->oe_link, list);
- unplug = 1;
- }
+ unplug = true;
} else {
/* the only discarder is lock cancelling, so
* [start, end] must contain this extent */
git://git.whamcloud.com / fs / lustre-release.git / blobdiff