* GPL HEADER END
*/
/*
- * Copyright (c) 2013, Intel Corporation.
+ * Copyright (c) 2013, 2015, Intel Corporation.
* Use is subject to license terms.
*
* lustre/osp/lwp_dev.c
*
- * Light Weight Proxy, which is just for managing the connection established
- * from OSTs/MDTs to MDT0.
+ * This file provides code related to the Light Weight Proxy (LWP) managing
+ * the connections established from OST to MDT, and MDT to MDT0.
+ *
+ * A LWP connection is used to send quota and FLD query requests. It's not
+ * recoverable, which means target server doesn't have an on-disk record in
+ * the last_rcvd file to remember the connection. Once LWP reconnect after
+ * server reboot, server will always regard it as a new connection.
*
* Author: <di.wang@intel.com>
* Author: <yawei.niu@intel.com>
#include <obd_class.h>
#include <lustre_param.h>
#include <lustre_log.h>
-#include <libcfs/libcfs_string.h>
+#include <linux/kthread.h>
+
+#include "osp_internal.h"
struct lwp_device {
struct lu_device lpd_dev;
- struct obd_device *lpd_obd;
- struct obd_uuid lpd_cluuid;
- struct obd_export *lpd_exp;
- int lpd_connects;
+ struct obd_device *lpd_obd; /* corresponding OBD device */
+ struct obd_uuid lpd_cluuid;/* UUID of LWP */
+ struct obd_export *lpd_exp; /* export of LWP */
+ struct ptlrpc_thread lpd_notify_thread; /* notify thread */
+ int lpd_connects; /* use count, 0 or 1 */
};
static inline struct lwp_device *lu2lwp_dev(struct lu_device *d)
return &d->lpd_dev;
}
+/**
+ * Setup LWP device.
+ *
+ * \param[in] env environment passed by caller
+ * \param[in] lwp LWP device to be setup
+ * \param[in] nidstring remote target NID
+ *
+ * \retval 0 on success
+ * \retval negative number on error
+ */
static int lwp_setup(const struct lu_env *env, struct lwp_device *lwp,
char *nidstring)
{
char *ptr;
class_uuid_t uuid;
struct obd_import *imp;
- int len = strlen(lwp_name);
+ int len = strlen(lwp_name) + 1;
int rc;
ENTRY;
+ thread_set_flags(&lwp->lpd_notify_thread, SVC_STOPPED);
+ init_waitqueue_head(&lwp->lpd_notify_thread.t_ctl_waitq);
+
OBD_ALLOC_PTR(bufs);
if (bufs == NULL)
RETURN(-ENOMEM);
strncpy(server_uuid, lwp_name, ptr - lwp_name);
server_uuid[ptr - lwp_name] = '\0';
- strncat(server_uuid, "_UUID", len - 1);
+ strlcat(server_uuid, "_UUID", len);
lustre_cfg_bufs_reset(bufs, lwp_name);
lustre_cfg_bufs_set_string(bufs, 1, server_uuid);
lustre_cfg_bufs_set_string(bufs, 2, nidstring);
RETURN(rc);
}
+/**
+ * Disconnect the import from LWP.
+ *
+ * \param[in] d LWP device to be disconnected
+ *
+ * \retval 0 on success
+ * \retval negative number on error
+ */
static int lwp_disconnect(struct lwp_device *d)
{
struct obd_import *imp;
imp = d->lpd_obd->u.cli.cl_import;
- /* Mark import deactivated now, so we don't try to reconnect if any
+ /*
+ * Mark import deactivated now, so we don't try to reconnect if any
* of the cleanup RPCs fails (e.g. ldlm cancel, etc). We don't
- * fully deactivate the import, or that would drop all requests. */
+ * fully deactivate the import because that would cause all requests
+ * to be dropped.
+ */
LASSERT(imp != NULL);
spin_lock(&imp->imp_lock);
imp->imp_deactive = 1;
ptlrpc_deactivate_import(imp);
- /* Some non-replayable imports (MDS's OSCs) are pinged, so just
+ /*
+ * Some non-replayable imports (MDS's OSCs) are pinged, so just
* delete it regardless. (It's safe to delete an import that was
- * never added.) */
+ * never added.)
+ */
ptlrpc_pinger_del_import(imp);
rc = ptlrpc_disconnect_import(imp, 0);
- if (rc != 0 && rc != -ETIMEDOUT && rc != -ENOTCONN && rc != -ESHUTDOWN)
+ if (rc != 0)
CWARN("%s: can't disconnect: rc = %d\n",
d->lpd_obd->obd_name, rc);
- else
- rc = 0;
ptlrpc_invalidate_import(imp);
RETURN(rc);
}
+/**
+ * Implementation of lu_device_operations::ldo_process_config.
+ *
+ * Process a Lustre configuration request.
+ *
+ * \param[in] env environment passed by caller
+ * \param[in] dev device to be processed
+ * \param[in] lcfg lustre_cfg, LCFG_PRE_CLEANUP or LCFG_CLEANUP
+ *
+ * \retval 0 on success
+ * \retval negative number on error
+ */
static int lwp_process_config(const struct lu_env *env,
struct lu_device *dev, struct lustre_cfg *lcfg)
{
RETURN(rc);
}
-const struct lu_device_operations lwp_lu_ops = {
+static const struct lu_device_operations lwp_lu_ops = {
.ldo_process_config = lwp_process_config,
};
-static struct lprocfs_vars lprocfs_lwp_module_vars[] = {
- { "num_refs", lprocfs_rd_numrefs, 0, 0 },
- { 0 }
-};
-
-static struct lprocfs_vars lprocfs_lwp_obd_vars[] = {
- { 0 }
-};
-
-void lprocfs_lwp_init_vars(struct lprocfs_static_vars *lvars)
-{
- lvars->module_vars = lprocfs_lwp_module_vars;
- lvars->obd_vars = lprocfs_lwp_obd_vars;
-}
-
-int lwp_init0(const struct lu_env *env, struct lwp_device *lwp,
- struct lu_device_type *ldt, struct lustre_cfg *cfg)
+/**
+ * Initialize LWP device.
+ *
+ * \param[in] env environment passed by caller
+ * \param[in] lwp device to be initialized
+ * \param[in] ldt not used
+ * \param[in] cfg lustre_cfg contains remote target uuid
+ *
+ * \retval 0 on success
+ * \retval -ENODEV if the device name cannot be found
+ * \retval negative numbers on other errors
+ */
+static int lwp_init0(const struct lu_env *env, struct lwp_device *lwp,
+ struct lu_device_type *ldt, struct lustre_cfg *cfg)
{
- struct lprocfs_static_vars lvars = { 0 };
int rc;
ENTRY;
RETURN(rc);
}
- lprocfs_lwp_init_vars(&lvars);
- if (lprocfs_obd_setup(lwp->lpd_obd, lvars.obd_vars) == 0)
+ if (lprocfs_obd_setup(lwp->lpd_obd) == 0) {
+ sptlrpc_lprocfs_cliobd_attach(lwp->lpd_obd);
ptlrpc_lprocfs_register_obd(lwp->lpd_obd);
+ }
RETURN(0);
}
+/**
+ * Implementation of lu_device_type_operations::ldto_device_free.
+ *
+ * Free a LWP device.
+ *
+ * \param[in] env environment passed by caller
+ * \param[in] lu device to be freed
+ *
+ * \retval NULL to indicate that this is the bottom device
+ * of the stack and there are no more devices
+ * below this one to be cleaned up.
+ */
static struct lu_device *lwp_device_free(const struct lu_env *env,
struct lu_device *lu)
{
struct lwp_device *m = lu2lwp_dev(lu);
ENTRY;
- if (cfs_atomic_read(&lu->ld_ref) && lu->ld_site) {
+ if (atomic_read(&lu->ld_ref) && lu->ld_site) {
LIBCFS_DEBUG_MSG_DATA_DECL(msgdata, D_ERROR, NULL);
lu_site_print(env, lu->ld_site, &msgdata, lu_cdebug_printer);
}
RETURN(NULL);
}
+/**
+ * Implementation of lu_device_type_operations::ldto_device_alloc.
+ *
+ * Allocate a LWP device.
+ *
+ * \param[in] env environment passed by caller
+ * \param[in] ldt device type whose name is LUSTRE_LWP_NAME
+ * \param[in] lcfg lustre_cfg contains remote target UUID
+ *
+ * \retval pointer of allocated LWP device on success
+ * \retval ERR_PTR(errno) on error
+ */
static struct lu_device *lwp_device_alloc(const struct lu_env *env,
- struct lu_device_type *t,
+ struct lu_device_type *ldt,
struct lustre_cfg *lcfg)
{
struct lwp_device *lwp;
- struct lu_device *l;
+ struct lu_device *ludev;
OBD_ALLOC_PTR(lwp);
if (lwp == NULL) {
- l = ERR_PTR(-ENOMEM);
+ ludev = ERR_PTR(-ENOMEM);
} else {
int rc;
- l = lwp2lu_dev(lwp);
- lu_device_init(&lwp->lpd_dev, t);
- rc = lwp_init0(env, lwp, t, lcfg);
+ ludev = lwp2lu_dev(lwp);
+ lu_device_init(&lwp->lpd_dev, ldt);
+ rc = lwp_init0(env, lwp, ldt, lcfg);
if (rc != 0) {
- lwp_device_free(env, l);
- l = ERR_PTR(rc);
+ lwp_device_free(env, ludev);
+ ludev = ERR_PTR(rc);
}
}
- return l;
+ return ludev;
}
+/**
+ * Implementation of lu_device_type_operations::ltdo_device_fini.
+ *
+ * Finalize LWP device.
+ *
+ * \param[in] env environment passed by caller
+ * \param[in] ludev device to be finalized
+ *
+ * \retval NULL on success
+ */
static struct lu_device *lwp_device_fini(const struct lu_env *env,
- struct lu_device *d)
+ struct lu_device *ludev)
{
- struct lwp_device *m = lu2lwp_dev(d);
- struct obd_import *imp;
- int rc;
+ struct lwp_device *m = lu2lwp_dev(ludev);
+ struct ptlrpc_thread *thread = &m->lpd_notify_thread;
+ struct l_wait_info lwi = { 0 };
+ int rc;
ENTRY;
+ if (!thread_is_stopped(thread))
+ l_wait_event(thread->t_ctl_waitq, thread_is_stopped(thread),
+ &lwi);
+
if (m->lpd_exp != NULL)
class_disconnect(m->lpd_exp);
- imp = m->lpd_obd->u.cli.cl_import;
-
- if (imp->imp_rq_pool) {
- ptlrpc_free_rq_pool(imp->imp_rq_pool);
- imp->imp_rq_pool = NULL;
- }
-
LASSERT(m->lpd_obd);
ptlrpc_lprocfs_unregister_obd(m->lpd_obd);
lprocfs_obd_cleanup(m->lpd_obd);
.ldt_ctx_tags = LCT_MD_THREAD
};
+static int lwp_notify_main(void *args)
+{
+ struct obd_export *exp = (struct obd_export *)args;
+ struct lwp_device *lwp;
+ struct ptlrpc_thread *thread;
+
+ LASSERT(exp != NULL);
+ lwp = lu2lwp_dev(exp->exp_obd->obd_lu_dev);
+ thread = &lwp->lpd_notify_thread;
+
+ thread_set_flags(thread, SVC_RUNNING);
+ wake_up(&thread->t_ctl_waitq);
+
+ lustre_notify_lwp_list(exp);
+
+ thread_set_flags(thread, SVC_STOPPED);
+ wake_up(&thread->t_ctl_waitq);
+ return 0;
+}
+
+/*
+ * Some notify callbacks may cause deadlock in failover
+ * scenario, so we have to start thread to run callbacks
+ * asynchronously. See LU-6273.
+ */
+static void lwp_notify_users(struct obd_export *exp)
+{
+ struct lwp_device *lwp;
+ struct ptlrpc_thread *thread;
+ struct task_struct *task;
+ struct l_wait_info lwi = { 0 };
+ char name[MTI_NAME_MAXLEN];
+
+ LASSERT(exp != NULL);
+ lwp = lu2lwp_dev(exp->exp_obd->obd_lu_dev);
+ thread = &lwp->lpd_notify_thread;
+
+ snprintf(name, MTI_NAME_MAXLEN, "lwp_notify_%s",
+ exp->exp_obd->obd_name);
+
+ /* Notify happens only on LWP setup, so there shouldn't
+ * be notify thread running */
+ if (!thread_is_stopped(thread)) {
+ CERROR("LWP notify thread: %s wasn't stopped\n", name);
+ return;
+ }
+
+ task = kthread_run(lwp_notify_main, exp, name);
+ if (IS_ERR(task)) {
+ thread_set_flags(thread, SVC_STOPPED);
+ CERROR("Failed to start LWP notify thread:%s. %lu\n",
+ name, PTR_ERR(task));
+ }
+
+ l_wait_event(thread->t_ctl_waitq,
+ thread_is_running(thread) || thread_is_stopped(thread),
+ &lwi);
+}
+
+/**
+ * Implementation of OBD device operations obd_ops::o_connect.
+ *
+ * Create export for LWP, and connect to target server.
+ *
+ * \param[in] env the environment passed by caller
+ * \param[out] exp export for the connection to be established
+ * \param[in] obd OBD device to perform the connect on
+ * \param[in] cluuid UUID of the OBD device
+ * \param[in] data connect data containing compatibility flags
+ * \param[in] localdata not used
+ *
+ * \retval 0 on success
+ * \retval negative number on error
+ */
static int lwp_obd_connect(const struct lu_env *env, struct obd_export **exp,
struct obd_device *obd, struct obd_uuid *cluuid,
struct obd_connect_data *data, void *localdata)
*exp = class_conn2export(&conn);
lwp->lpd_exp = *exp;
- /* Why should there ever be more than 1 connect? */
lwp->lpd_connects++;
LASSERT(lwp->lpd_connects == 1);
ocd->ocd_version = LUSTRE_VERSION_CODE;
imp->imp_connect_flags_orig = ocd->ocd_connect_flags;
+ imp->imp_connect_flags2_orig = ocd->ocd_connect_flags2;
rc = ptlrpc_connect_import(imp);
if (rc != 0) {
out_sem:
up_write(&cli->cl_sem);
+ if (rc == 0)
+ lwp_notify_users(*exp);
+
return rc;
}
+/**
+ * Implementation of OBD device operations obd_ops::o_disconnect.
+ *
+ * Release export for the LWP. Only disconnect the underlying layers
+ * on the final disconnect.
+ *
+ * \param[in] exp the export to perform disconnect on
+ *
+ * \retval 0 on success
+ * \retval negative number on error
+ */
static int lwp_obd_disconnect(struct obd_export *exp)
{
struct obd_device *obd = exp->exp_obd;
int rc;
ENTRY;
- /* Only disconnect the underlying layers on the final disconnect. */
LASSERT(lwp->lpd_connects == 1);
lwp->lpd_connects--;
RETURN(rc);
}
+/**
+ * Handle import events for the LWP device.
+ *
+ * \param[in] obd OBD device associated with the import
+ * \param[in] imp the import which event happened on
+ * \param[in] event event type
+ *
+ * \retval 0 on success
+ * \retval negative number on error
+ */
static int lwp_import_event(struct obd_device *obd, struct obd_import *imp,
enum obd_import_event event)
{
return 0;
}
+static int lwp_set_info_async(const struct lu_env *env,
+ struct obd_export *exp,
+ u32 keylen, void *key,
+ u32 vallen, void *val,
+ struct ptlrpc_request_set *set)
+{
+ ENTRY;
+
+ if (KEY_IS(KEY_SPTLRPC_CONF)) {
+ sptlrpc_conf_client_adapt(exp->exp_obd);
+ RETURN(0);
+ }
+
+ CERROR("Unknown key %s\n", (char *)key);
+ RETURN(-EINVAL);
+}
+
struct obd_ops lwp_obd_device_ops = {
.o_owner = THIS_MODULE,
.o_add_conn = client_import_add_conn,
.o_connect = lwp_obd_connect,
.o_disconnect = lwp_obd_disconnect,
.o_import_event = lwp_import_event,
+ .o_set_info_async = lwp_set_info_async,
};
git://git.whamcloud.com / fs / lustre-release.git / blobdiff