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Subject[PATCH 05/19] staging: lustre: use wait_event_idle_timeout() where appropriate.
When the lwi arg has a timeout, but no timeout
callback function, l_wait_event() acts much the same as
wait_event_idle_timeout() - the wait is not interruptible and
simply waits for the event or the timeouts.

The most noticable difference is that the return value is
-ETIMEDOUT or 0, rather than 0 or non-zero.

Another difference is that if the timeout is zero, l_wait_event()
will not time out at all. In the one case where that is possible
we need to conditionally use wait_event_idle().

So replace all such calls with wait_event_idle_timeout(), being
careful of the return value.

In one case, there is no event expected, only the timeout
is needed. So use schedule_timeout_uninterruptible().

Note that the presence or absence of LWI_ON_SIGNAL_NOOP
has no effect in these cases. It only has effect if the timeout
callback is non-NULL, or the timeout is zero, or
LWI_TIMEOUT_INTR_ALL() is used.

Signed-off-by: NeilBrown <neilb@suse.com>
---
drivers/staging/lustre/lustre/ldlm/ldlm_lock.c | 10 ++------
drivers/staging/lustre/lustre/ldlm/ldlm_pool.c | 12 +++-------
drivers/staging/lustre/lustre/llite/statahead.c | 14 ++++-------
drivers/staging/lustre/lustre/mdc/mdc_request.c | 5 +---
drivers/staging/lustre/lustre/mgc/mgc_request.c | 15 +++++-------
drivers/staging/lustre/lustre/obdclass/cl_io.c | 17 ++++++++------
drivers/staging/lustre/lustre/osc/osc_cache.c | 25 ++++++++++----------
drivers/staging/lustre/lustre/ptlrpc/events.c | 7 +-----
drivers/staging/lustre/lustre/ptlrpc/import.c | 12 ++++------
.../staging/lustre/lustre/ptlrpc/pack_generic.c | 9 +++----
drivers/staging/lustre/lustre/ptlrpc/pinger.c | 12 +++-------
drivers/staging/lustre/lustre/ptlrpc/recover.c | 12 ++++------
drivers/staging/lustre/lustre/ptlrpc/sec_gc.c | 10 ++------
drivers/staging/lustre/lustre/ptlrpc/service.c | 11 ++++-----
14 files changed, 68 insertions(+), 103 deletions(-)

diff --git a/drivers/staging/lustre/lustre/ldlm/ldlm_lock.c b/drivers/staging/lustre/lustre/ldlm/ldlm_lock.c
index 773abe78708a..95bea351d21d 100644
--- a/drivers/staging/lustre/lustre/ldlm/ldlm_lock.c
+++ b/drivers/staging/lustre/lustre/ldlm/ldlm_lock.c
@@ -1349,7 +1349,6 @@ enum ldlm_mode ldlm_lock_match(struct ldlm_namespace *ns, __u64 flags,
if ((flags & LDLM_FL_LVB_READY) && !ldlm_is_lvb_ready(lock)) {
__u64 wait_flags = LDLM_FL_LVB_READY |
LDLM_FL_DESTROYED | LDLM_FL_FAIL_NOTIFIED;
- struct l_wait_info lwi;

if (lock->l_completion_ast) {
int err = lock->l_completion_ast(lock,
@@ -1366,13 +1365,10 @@ enum ldlm_mode ldlm_lock_match(struct ldlm_namespace *ns, __u64 flags,
}
}

- lwi = LWI_TIMEOUT_INTR(obd_timeout * HZ,
- NULL, LWI_ON_SIGNAL_NOOP, NULL);
-
/* XXX FIXME see comment on CAN_MATCH in lustre_dlm.h */
- l_wait_event(lock->l_waitq,
- lock->l_flags & wait_flags,
- &lwi);
+ wait_event_idle_timeout(lock->l_waitq,
+ lock->l_flags & wait_flags,
+ obd_timeout * HZ);
if (!ldlm_is_lvb_ready(lock)) {
if (flags & LDLM_FL_TEST_LOCK)
LDLM_LOCK_RELEASE(lock);
diff --git a/drivers/staging/lustre/lustre/ldlm/ldlm_pool.c b/drivers/staging/lustre/lustre/ldlm/ldlm_pool.c
index 622245a5f049..a0e486b57e08 100644
--- a/drivers/staging/lustre/lustre/ldlm/ldlm_pool.c
+++ b/drivers/staging/lustre/lustre/ldlm/ldlm_pool.c
@@ -997,8 +997,6 @@ static int ldlm_pools_thread_main(void *arg)
"ldlm_poold", current_pid());

while (1) {
- struct l_wait_info lwi;
-
/*
* Recal all pools on this tick.
*/
@@ -1008,12 +1006,10 @@ static int ldlm_pools_thread_main(void *arg)
* Wait until the next check time, or until we're
* stopped.
*/
- lwi = LWI_TIMEOUT(c_time * HZ,
- NULL, NULL);
- l_wait_event(thread->t_ctl_waitq,
- thread_is_stopping(thread) ||
- thread_is_event(thread),
- &lwi);
+ wait_event_idle_timeout(thread->t_ctl_waitq,
+ thread_is_stopping(thread) ||
+ thread_is_event(thread),
+ c_time * HZ);

if (thread_test_and_clear_flags(thread, SVC_STOPPING))
break;
diff --git a/drivers/staging/lustre/lustre/llite/statahead.c b/drivers/staging/lustre/lustre/llite/statahead.c
index 96360f104b92..6052bfd7ff05 100644
--- a/drivers/staging/lustre/lustre/llite/statahead.c
+++ b/drivers/staging/lustre/lustre/llite/statahead.c
@@ -1151,10 +1151,9 @@ static int ll_statahead_thread(void *arg)
*/
while (sai->sai_sent != sai->sai_replied) {
/* in case we're not woken up, timeout wait */
- struct l_wait_info lwi = LWI_TIMEOUT(msecs_to_jiffies(MSEC_PER_SEC >> 3),
- NULL, NULL);
- l_wait_event(sa_thread->t_ctl_waitq,
- sai->sai_sent == sai->sai_replied, &lwi);
+ wait_event_idle_timeout(sa_thread->t_ctl_waitq,
+ sai->sai_sent == sai->sai_replied,
+ HZ>>3);
}

/* release resources held by statahead RPCs */
@@ -1374,7 +1373,6 @@ static int revalidate_statahead_dentry(struct inode *dir,
{
struct ll_inode_info *lli = ll_i2info(dir);
struct sa_entry *entry = NULL;
- struct l_wait_info lwi = { 0 };
struct ll_dentry_data *ldd;
int rc = 0;

@@ -1424,10 +1422,8 @@ static int revalidate_statahead_dentry(struct inode *dir,
spin_lock(&lli->lli_sa_lock);
sai->sai_index_wait = entry->se_index;
spin_unlock(&lli->lli_sa_lock);
- lwi = LWI_TIMEOUT_INTR(30 * HZ, NULL,
- LWI_ON_SIGNAL_NOOP, NULL);
- rc = l_wait_event(sai->sai_waitq, sa_ready(entry), &lwi);
- if (rc < 0) {
+ if (0 == wait_event_idle_timeout(sai->sai_waitq,
+ sa_ready(entry), 30 * HZ)) {
/*
* entry may not be ready, so it may be used by inflight
* statahead RPC, don't free it.
diff --git a/drivers/staging/lustre/lustre/mdc/mdc_request.c b/drivers/staging/lustre/lustre/mdc/mdc_request.c
index b12518ba5ae9..ab48746ce433 100644
--- a/drivers/staging/lustre/lustre/mdc/mdc_request.c
+++ b/drivers/staging/lustre/lustre/mdc/mdc_request.c
@@ -838,7 +838,6 @@ static int mdc_getpage(struct obd_export *exp, const struct lu_fid *fid,
struct ptlrpc_bulk_desc *desc;
struct ptlrpc_request *req;
wait_queue_head_t waitq;
- struct l_wait_info lwi;
int resends = 0;
int rc;
int i;
@@ -888,9 +887,7 @@ static int mdc_getpage(struct obd_export *exp, const struct lu_fid *fid,
exp->exp_obd->obd_name, -EIO);
return -EIO;
}
- lwi = LWI_TIMEOUT_INTR(resends * HZ, NULL, NULL,
- NULL);
- l_wait_event(waitq, 0, &lwi);
+ wait_event_idle_timeout(waitq, 0, resends * HZ);

goto restart_bulk;
}
diff --git a/drivers/staging/lustre/lustre/mgc/mgc_request.c b/drivers/staging/lustre/lustre/mgc/mgc_request.c
index a01d13bde102..c61cd23a96df 100644
--- a/drivers/staging/lustre/lustre/mgc/mgc_request.c
+++ b/drivers/staging/lustre/lustre/mgc/mgc_request.c
@@ -535,7 +535,6 @@ static int mgc_requeue_thread(void *data)
spin_lock(&config_list_lock);
rq_state |= RQ_RUNNING;
while (!(rq_state & RQ_STOP)) {
- struct l_wait_info lwi;
struct config_llog_data *cld, *cld_prev;
int rand = prandom_u32_max(MGC_TIMEOUT_RAND_CENTISEC);
int to;
@@ -556,9 +555,9 @@ static int mgc_requeue_thread(void *data)
to = msecs_to_jiffies(MGC_TIMEOUT_MIN_SECONDS * MSEC_PER_SEC);
/* rand is centi-seconds */
to += msecs_to_jiffies(rand * MSEC_PER_SEC / 100);
- lwi = LWI_TIMEOUT(to, NULL, NULL);
- l_wait_event(rq_waitq, rq_state & (RQ_STOP | RQ_PRECLEANUP),
- &lwi);
+ wait_event_idle_timeout(rq_waitq,
+ rq_state & (RQ_STOP | RQ_PRECLEANUP),
+ to);

/*
* iterate & processing through the list. for each cld, process
@@ -1628,9 +1627,7 @@ int mgc_process_log(struct obd_device *mgc, struct config_llog_data *cld)

if (rcl == -ESHUTDOWN &&
atomic_read(&mgc->u.cli.cl_mgc_refcount) > 0 && !retry) {
- int secs = obd_timeout * HZ;
struct obd_import *imp;
- struct l_wait_info lwi;

mutex_unlock(&cld->cld_lock);
imp = class_exp2cliimp(mgc->u.cli.cl_mgc_mgsexp);
@@ -1645,9 +1642,9 @@ int mgc_process_log(struct obd_device *mgc, struct config_llog_data *cld)
*/
ptlrpc_pinger_force(imp);

- lwi = LWI_TIMEOUT(secs, NULL, NULL);
- l_wait_event(imp->imp_recovery_waitq,
- !mgc_import_in_recovery(imp), &lwi);
+ wait_event_idle_timeout(imp->imp_recovery_waitq,
+ !mgc_import_in_recovery(imp),
+ obd_timeout * HZ);

if (imp->imp_state == LUSTRE_IMP_FULL) {
retry = true;
diff --git a/drivers/staging/lustre/lustre/obdclass/cl_io.c b/drivers/staging/lustre/lustre/obdclass/cl_io.c
index ce5e7bdda692..ab84e011b560 100644
--- a/drivers/staging/lustre/lustre/obdclass/cl_io.c
+++ b/drivers/staging/lustre/lustre/obdclass/cl_io.c
@@ -1097,16 +1097,19 @@ EXPORT_SYMBOL(cl_sync_io_init);
int cl_sync_io_wait(const struct lu_env *env, struct cl_sync_io *anchor,
long timeout)
{
- struct l_wait_info lwi = LWI_TIMEOUT_INTR(timeout * HZ,
- NULL, NULL, NULL);
- int rc;
+ int rc = 1;

LASSERT(timeout >= 0);

- rc = l_wait_event(anchor->csi_waitq,
- atomic_read(&anchor->csi_sync_nr) == 0,
- &lwi);
- if (rc < 0) {
+ if (timeout == 0)
+ wait_event_idle(anchor->csi_waitq,
+ atomic_read(&anchor->csi_sync_nr) == 0);
+ else
+ rc = wait_event_idle_timeout(anchor->csi_waitq,
+ atomic_read(&anchor->csi_sync_nr) == 0,
+ timeout * HZ);
+ if (rc == 0) {
+ rc = -ETIMEDOUT;
CERROR("IO failed: %d, still wait for %d remaining entries\n",
rc, atomic_read(&anchor->csi_sync_nr));

diff --git a/drivers/staging/lustre/lustre/osc/osc_cache.c b/drivers/staging/lustre/lustre/osc/osc_cache.c
index 0797e671f667..dacfab12c501 100644
--- a/drivers/staging/lustre/lustre/osc/osc_cache.c
+++ b/drivers/staging/lustre/lustre/osc/osc_cache.c
@@ -934,8 +934,6 @@ static int osc_extent_wait(const struct lu_env *env, struct osc_extent *ext,
enum osc_extent_state state)
{
struct osc_object *obj = ext->oe_obj;
- struct l_wait_info lwi = LWI_TIMEOUT_INTR(600 * HZ, NULL,
- LWI_ON_SIGNAL_NOOP, NULL);
int rc = 0;

osc_object_lock(obj);
@@ -958,17 +956,19 @@ static int osc_extent_wait(const struct lu_env *env, struct osc_extent *ext,
osc_extent_release(env, ext);

/* wait for the extent until its state becomes @state */
- rc = l_wait_event(ext->oe_waitq, extent_wait_cb(ext, state), &lwi);
- if (rc == -ETIMEDOUT) {
+ rc = wait_event_idle_timeout(ext->oe_waitq,
+ extent_wait_cb(ext, state), 600 * HZ);
+ if (rc == 0) {
OSC_EXTENT_DUMP(D_ERROR, ext,
"%s: wait ext to %u timedout, recovery in progress?\n",
cli_name(osc_cli(obj)), state);

wait_event_idle(ext->oe_waitq, extent_wait_cb(ext, state));
- rc = 0;
}
- if (rc == 0 && ext->oe_rc < 0)
+ if (ext->oe_rc < 0)
rc = ext->oe_rc;
+ else
+ rc = 0;
return rc;
}

@@ -1568,12 +1568,9 @@ static int osc_enter_cache(const struct lu_env *env, struct client_obd *cli,
struct osc_object *osc = oap->oap_obj;
struct lov_oinfo *loi = osc->oo_oinfo;
struct osc_cache_waiter ocw;
- struct l_wait_info lwi;
+ unsigned long timeout = (AT_OFF ? obd_timeout : at_max) * HZ;
int rc = -EDQUOT;

- lwi = LWI_TIMEOUT_INTR((AT_OFF ? obd_timeout : at_max) * HZ,
- NULL, LWI_ON_SIGNAL_NOOP, NULL);
-
OSC_DUMP_GRANT(D_CACHE, cli, "need:%d\n", bytes);

spin_lock(&cli->cl_loi_list_lock);
@@ -1616,13 +1613,15 @@ static int osc_enter_cache(const struct lu_env *env, struct client_obd *cli,
CDEBUG(D_CACHE, "%s: sleeping for cache space @ %p for %p\n",
cli_name(cli), &ocw, oap);

- rc = l_wait_event(ocw.ocw_waitq, ocw_granted(cli, &ocw), &lwi);
+ rc = wait_event_idle_timeout(ocw.ocw_waitq,
+ ocw_granted(cli, &ocw), timeout);

spin_lock(&cli->cl_loi_list_lock);

- if (rc < 0) {
- /* l_wait_event is interrupted by signal, or timed out */
+ if (rc == 0) {
+ /* wait_event is interrupted by signal, or timed out */
list_del_init(&ocw.ocw_entry);
+ rc = -ETIMEDOUT;
break;
}
LASSERT(list_empty(&ocw.ocw_entry));
diff --git a/drivers/staging/lustre/lustre/ptlrpc/events.c b/drivers/staging/lustre/lustre/ptlrpc/events.c
index 71f7588570ef..130bacc2c891 100644
--- a/drivers/staging/lustre/lustre/ptlrpc/events.c
+++ b/drivers/staging/lustre/lustre/ptlrpc/events.c
@@ -490,8 +490,6 @@ int ptlrpc_uuid_to_peer(struct obd_uuid *uuid,

static void ptlrpc_ni_fini(void)
{
- wait_queue_head_t waitq;
- struct l_wait_info lwi;
int rc;
int retries;

@@ -515,10 +513,7 @@ static void ptlrpc_ni_fini(void)
if (retries != 0)
CWARN("Event queue still busy\n");

- /* Wait for a bit */
- init_waitqueue_head(&waitq);
- lwi = LWI_TIMEOUT(2 * HZ, NULL, NULL);
- l_wait_event(waitq, 0, &lwi);
+ schedule_timeout_uninterruptible(2 * HZ);
break;
}
}
diff --git a/drivers/staging/lustre/lustre/ptlrpc/import.c b/drivers/staging/lustre/lustre/ptlrpc/import.c
index 0eba5f18bd3b..ed210550f61f 100644
--- a/drivers/staging/lustre/lustre/ptlrpc/import.c
+++ b/drivers/staging/lustre/lustre/ptlrpc/import.c
@@ -430,21 +430,19 @@ void ptlrpc_fail_import(struct obd_import *imp, __u32 conn_cnt)

int ptlrpc_reconnect_import(struct obd_import *imp)
{
- struct l_wait_info lwi;
- int secs = obd_timeout * HZ;
int rc;

ptlrpc_pinger_force(imp);

CDEBUG(D_HA, "%s: recovery started, waiting %u seconds\n",
- obd2cli_tgt(imp->imp_obd), secs);
+ obd2cli_tgt(imp->imp_obd), obd_timeout);

- lwi = LWI_TIMEOUT(secs, NULL, NULL);
- rc = l_wait_event(imp->imp_recovery_waitq,
- !ptlrpc_import_in_recovery(imp), &lwi);
+ rc = wait_event_idle_timeout(imp->imp_recovery_waitq,
+ !ptlrpc_import_in_recovery(imp),
+ obd_timeout * HZ);
CDEBUG(D_HA, "%s: recovery finished s:%s\n", obd2cli_tgt(imp->imp_obd),
ptlrpc_import_state_name(imp->imp_state));
- return rc;
+ return rc == 0 ? -ETIMEDOUT : 0;
}
EXPORT_SYMBOL(ptlrpc_reconnect_import);

diff --git a/drivers/staging/lustre/lustre/ptlrpc/pack_generic.c b/drivers/staging/lustre/lustre/ptlrpc/pack_generic.c
index c060d6f5015a..f73463ac401f 100644
--- a/drivers/staging/lustre/lustre/ptlrpc/pack_generic.c
+++ b/drivers/staging/lustre/lustre/ptlrpc/pack_generic.c
@@ -260,17 +260,16 @@ lustre_get_emerg_rs(struct ptlrpc_service_part *svcpt)

/* See if we have anything in a pool, and wait if nothing */
while (list_empty(&svcpt->scp_rep_idle)) {
- struct l_wait_info lwi;
int rc;

spin_unlock(&svcpt->scp_rep_lock);
/* If we cannot get anything for some long time, we better
* bail out instead of waiting infinitely
*/
- lwi = LWI_TIMEOUT(10 * HZ, NULL, NULL);
- rc = l_wait_event(svcpt->scp_rep_waitq,
- !list_empty(&svcpt->scp_rep_idle), &lwi);
- if (rc != 0)
+ rc = wait_event_idle_timeout(svcpt->scp_rep_waitq,
+ !list_empty(&svcpt->scp_rep_idle),
+ 10 * HZ);
+ if (rc == 0)
goto out;
spin_lock(&svcpt->scp_rep_lock);
}
diff --git a/drivers/staging/lustre/lustre/ptlrpc/pinger.c b/drivers/staging/lustre/lustre/ptlrpc/pinger.c
index 010a1cdf05fa..639070f6e68e 100644
--- a/drivers/staging/lustre/lustre/ptlrpc/pinger.c
+++ b/drivers/staging/lustre/lustre/ptlrpc/pinger.c
@@ -228,7 +228,6 @@ static int ptlrpc_pinger_main(void *arg)
/* And now, loop forever, pinging as needed. */
while (1) {
unsigned long this_ping = cfs_time_current();
- struct l_wait_info lwi;
long time_to_next_wake;
struct timeout_item *item;
struct list_head *iter;
@@ -266,13 +265,10 @@ static int ptlrpc_pinger_main(void *arg)
cfs_time_add(this_ping,
PING_INTERVAL * HZ));
if (time_to_next_wake > 0) {
- lwi = LWI_TIMEOUT(max_t(long, time_to_next_wake,
- HZ),
- NULL, NULL);
- l_wait_event(thread->t_ctl_waitq,
- thread_is_stopping(thread) ||
- thread_is_event(thread),
- &lwi);
+ wait_event_idle_timeout(thread->t_ctl_waitq,
+ thread_is_stopping(thread) ||
+ thread_is_event(thread),
+ max_t(long, time_to_next_wake, HZ));
if (thread_test_and_clear_flags(thread, SVC_STOPPING))
break;
/* woken after adding import to reset timer */
diff --git a/drivers/staging/lustre/lustre/ptlrpc/recover.c b/drivers/staging/lustre/lustre/ptlrpc/recover.c
index 5bbd23eebfa6..7b5f2429d144 100644
--- a/drivers/staging/lustre/lustre/ptlrpc/recover.c
+++ b/drivers/staging/lustre/lustre/ptlrpc/recover.c
@@ -346,17 +346,15 @@ int ptlrpc_recover_import(struct obd_import *imp, char *new_uuid, int async)
goto out;

if (!async) {
- struct l_wait_info lwi;
- int secs = obd_timeout * HZ;
-
CDEBUG(D_HA, "%s: recovery started, waiting %u seconds\n",
- obd2cli_tgt(imp->imp_obd), secs);
+ obd2cli_tgt(imp->imp_obd), obd_timeout);

- lwi = LWI_TIMEOUT(secs, NULL, NULL);
- rc = l_wait_event(imp->imp_recovery_waitq,
- !ptlrpc_import_in_recovery(imp), &lwi);
+ rc = wait_event_idle_timeout(imp->imp_recovery_waitq,
+ !ptlrpc_import_in_recovery(imp),
+ obd_timeout * HZ);
CDEBUG(D_HA, "%s: recovery finished\n",
obd2cli_tgt(imp->imp_obd));
+ rc = rc? 0 : -ETIMEDOUT;
}

out:
diff --git a/drivers/staging/lustre/lustre/ptlrpc/sec_gc.c b/drivers/staging/lustre/lustre/ptlrpc/sec_gc.c
index b61e1aa25e8c..48f1a72afd77 100644
--- a/drivers/staging/lustre/lustre/ptlrpc/sec_gc.c
+++ b/drivers/staging/lustre/lustre/ptlrpc/sec_gc.c
@@ -142,7 +142,6 @@ static void sec_do_gc(struct ptlrpc_sec *sec)
static int sec_gc_main(void *arg)
{
struct ptlrpc_thread *thread = arg;
- struct l_wait_info lwi;

unshare_fs_struct();

@@ -179,12 +178,9 @@ static int sec_gc_main(void *arg)

/* check ctx list again before sleep */
sec_process_ctx_list();
-
- lwi = LWI_TIMEOUT(msecs_to_jiffies(SEC_GC_INTERVAL * MSEC_PER_SEC),
- NULL, NULL);
- l_wait_event(thread->t_ctl_waitq,
- thread_is_stopping(thread),
- &lwi);
+ wait_event_idle_timeout(thread->t_ctl_waitq,
+ thread_is_stopping(thread),
+ SEC_GC_INTERVAL * HZ);

if (thread_test_and_clear_flags(thread, SVC_STOPPING))
break;
diff --git a/drivers/staging/lustre/lustre/ptlrpc/service.c b/drivers/staging/lustre/lustre/ptlrpc/service.c
index 6d4229ebc9d9..5c41297d23d2 100644
--- a/drivers/staging/lustre/lustre/ptlrpc/service.c
+++ b/drivers/staging/lustre/lustre/ptlrpc/service.c
@@ -2588,13 +2588,12 @@ static void ptlrpc_wait_replies(struct ptlrpc_service_part *svcpt)
{
while (1) {
int rc;
- struct l_wait_info lwi = LWI_TIMEOUT(10 * HZ,
- NULL, NULL);

- rc = l_wait_event(svcpt->scp_waitq,
- atomic_read(&svcpt->scp_nreps_difficult) == 0,
- &lwi);
- if (rc == 0)
+ rc = wait_event_idle_timeout(
+ svcpt->scp_waitq,
+ atomic_read(&svcpt->scp_nreps_difficult) == 0,
+ 10 * HZ);
+ if (rc > 0)
break;
CWARN("Unexpectedly long timeout %s %p\n",
svcpt->scp_service->srv_name, svcpt->scp_service);

\
 
 \ /
  Last update: 2018-01-14 23:16    [W:0.255 / U:0.400 seconds]
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