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Date: Sun, 22 Jun 2014 21:32:10 -0400
From: Oleg Drokin <green@...uxhacker.ru>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
linux-kernel@...r.kernel.org, devel@...verdev.osuosl.org
Cc: Andriy Skulysh <Andriy_Skulysh@...atex.com>,
Oleg Drokin <oleg.drokin@...el.com>
Subject: [PATCH 06/18] staging/lustre/mgc: mgc import reconnect race
From: Andriy Skulysh <Andriy_Skulysh@...atex.com>
mgc import can be reconnected by pinger or
ptlrpc_reconnect_import().
ptlrpc_invalidate_import() isn't protected against
alteration of imp_invalid state. Import can be
reconnected by pinger which makes imp_invalid
equal to false. Thus LASSERT(imp->imp_invalid) fails
in ptlrpc_invalidate_import().
It is safe to call ptlrpc_invalidate_import() when
import is deactivated, but ptlrpc_reconnect_import() doesn't
deactivate it.
Let's use only pinger when available to reconnect import
Signed-off-by: Andriy Skulysh <Andriy_Skulysh@...atex.com>
Reviewed-on: http://review.whamcloud.com/9967
Xyratex-bug-id: MRP-1746
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-4913
Reviewed-by: Mike Pershin <mike.pershin@...el.com>
Reviewed-by: Lai Siyao <lai.siyao@...el.com>
Signed-off-by: Oleg Drokin <oleg.drokin@...el.com>
---
drivers/staging/lustre/lustre/obdclass/obd_mount.c | 13 ++-----
drivers/staging/lustre/lustre/ptlrpc/import.c | 41 +++++++++++++++++-----
drivers/staging/lustre/lustre/ptlrpc/pinger.c | 5 +++
3 files changed, 40 insertions(+), 19 deletions(-)
diff --git a/drivers/staging/lustre/lustre/obdclass/obd_mount.c b/drivers/staging/lustre/lustre/obdclass/obd_mount.c
index a034aee..03d9a6a 100644
--- a/drivers/staging/lustre/lustre/obdclass/obd_mount.c
+++ b/drivers/staging/lustre/lustre/obdclass/obd_mount.c
@@ -219,7 +219,6 @@ int lustre_start_mgc(struct super_block *sb)
lnet_nid_t nid;
char *mgcname = NULL, *niduuid = NULL, *mgssec = NULL;
char *ptr;
- int recov_bk;
int rc = 0, i = 0, j, len;
LASSERT(lsi->lsi_lmd);
@@ -269,6 +268,8 @@ int lustre_start_mgc(struct super_block *sb)
obd = class_name2obd(mgcname);
if (obd && !obd->obd_stopping) {
+ int recov_bk;
+
rc = obd_set_info_async(NULL, obd->obd_self_export,
strlen(KEY_MGSSEC), KEY_MGSSEC,
strlen(mgssec), mgssec, NULL);
@@ -429,16 +430,6 @@ int lustre_start_mgc(struct super_block *sb)
so we know when we can get rid of the mgc. */
atomic_set(&obd->u.cli.cl_mgc_refcount, 1);
- /* Try all connections, but only once. */
- recov_bk = 1;
- rc = obd_set_info_async(NULL, obd->obd_self_export,
- sizeof(KEY_INIT_RECOV_BACKUP),
- KEY_INIT_RECOV_BACKUP,
- sizeof(recov_bk), &recov_bk, NULL);
- if (rc)
- /* nonfatal */
- CWARN("can't set %s %d\n", KEY_INIT_RECOV_BACKUP, rc);
-
/* We connect to the MGS at setup, and don't disconnect until cleanup */
data->ocd_connect_flags = OBD_CONNECT_VERSION | OBD_CONNECT_AT |
OBD_CONNECT_FULL20 | OBD_CONNECT_IMP_RECOV |
diff --git a/drivers/staging/lustre/lustre/ptlrpc/import.c b/drivers/staging/lustre/lustre/ptlrpc/import.c
index 8573f32..b4def8a 100644
--- a/drivers/staging/lustre/lustre/ptlrpc/import.c
+++ b/drivers/staging/lustre/lustre/ptlrpc/import.c
@@ -275,6 +275,7 @@ void ptlrpc_invalidate_import(struct obd_import *imp)
if (!imp->imp_invalid || imp->imp_obd->obd_no_recov)
ptlrpc_deactivate_import(imp);
+ CFS_FAIL_TIMEOUT(OBD_FAIL_MGS_CONNECT_NET, 3 * cfs_fail_val / 2);
LASSERT(imp->imp_invalid);
/* Wait forever until inflight == 0. We really can't do it another
@@ -392,6 +393,19 @@ void ptlrpc_activate_import(struct obd_import *imp)
}
EXPORT_SYMBOL(ptlrpc_activate_import);
+static void ptlrpc_pinger_force(struct obd_import *imp)
+{
+ CDEBUG(D_HA, "%s: waking up pinger s:%s\n", obd2cli_tgt(imp->imp_obd),
+ ptlrpc_import_state_name(imp->imp_state));
+
+ spin_lock(&imp->imp_lock);
+ imp->imp_force_verify = 1;
+ spin_unlock(&imp->imp_lock);
+
+ if (imp->imp_state != LUSTRE_IMP_CONNECTING)
+ ptlrpc_pinger_wake_up();
+}
+
void ptlrpc_fail_import(struct obd_import *imp, __u32 conn_cnt)
{
LASSERT(!imp->imp_dlm_fake);
@@ -406,20 +420,30 @@ void ptlrpc_fail_import(struct obd_import *imp, __u32 conn_cnt)
ptlrpc_deactivate_import(imp);
}
- CDEBUG(D_HA, "%s: waking up pinger\n",
- obd2cli_tgt(imp->imp_obd));
-
- spin_lock(&imp->imp_lock);
- imp->imp_force_verify = 1;
- spin_unlock(&imp->imp_lock);
-
- ptlrpc_pinger_wake_up();
+ ptlrpc_pinger_force(imp);
}
}
EXPORT_SYMBOL(ptlrpc_fail_import);
int ptlrpc_reconnect_import(struct obd_import *imp)
{
+#ifdef ENABLE_PINGER
+ struct l_wait_info lwi;
+ int secs = cfs_time_seconds(obd_timeout);
+ int rc;
+
+ ptlrpc_pinger_force(imp);
+
+ CDEBUG(D_HA, "%s: recovery started, waiting %u seconds\n",
+ obd2cli_tgt(imp->imp_obd), secs);
+
+ lwi = LWI_TIMEOUT(secs, NULL, NULL);
+ rc = l_wait_event(imp->imp_recovery_waitq,
+ !ptlrpc_import_in_recovery(imp), &lwi);
+ CDEBUG(D_HA, "%s: recovery finished s:%s\n", obd2cli_tgt(imp->imp_obd),
+ ptlrpc_import_state_name(imp->imp_state));
+ return rc;
+#else
ptlrpc_set_import_discon(imp, 0);
/* Force a new connect attempt */
ptlrpc_invalidate_import(imp);
@@ -444,6 +468,7 @@ int ptlrpc_reconnect_import(struct obd_import *imp)
/* Attempt a new connect */
ptlrpc_recover_import(imp, NULL, 0);
return 0;
+#endif
}
EXPORT_SYMBOL(ptlrpc_reconnect_import);
diff --git a/drivers/staging/lustre/lustre/ptlrpc/pinger.c b/drivers/staging/lustre/lustre/ptlrpc/pinger.c
index 38099d9..2898087 100644
--- a/drivers/staging/lustre/lustre/ptlrpc/pinger.c
+++ b/drivers/staging/lustre/lustre/ptlrpc/pinger.c
@@ -224,6 +224,11 @@ static void ptlrpc_pinger_process_import(struct obd_import *imp,
"or recovery disabled: %s)\n",
imp->imp_obd->obd_uuid.uuid, obd2cli_tgt(imp->imp_obd),
ptlrpc_import_state_name(level));
+ if (force) {
+ spin_lock(&imp->imp_lock);
+ imp->imp_force_verify = 1;
+ spin_unlock(&imp->imp_lock);
+ }
} else if ((imp->imp_pingable && !suppress) || force_next || force) {
ptlrpc_ping(imp);
}
--
1.9.0
--
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