Viewing: osp_sync.c
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
* Use is subject to license terms.
*
* Copyright (c) 2012, 2017, Intel Corporation.
*/
/*
* This file is part of Lustre, http://www.lustre.org/
*
* Lustre OST Proxy Device
*
* Author: Alex Zhuravlev <alexey.zhuravlev@intel.com>
* Author: Mikhail Pershin <mike.pershin@intel.com>
*/
#define DEBUG_SUBSYSTEM S_MDS
#include <linux/kthread.h>
#include <linux/delay.h>
#include <lustre_log.h>
#include <lustre_update.h>
#include "osp_internal.h"
/*
* This is a components of OSP implementing synchronization between MDS and OST
* it LLOGs all interesting changes (e.g. UID/GID/projid, late striping, layout
* version, and object destroy) atomically, then makes sure changes hit OST
* storage
*
* The OSP syncing thread keeps on reading change records from LLOG. If there
* are still idle slots for both in-flight RPCs (opd_sync_rpcs_in_flight) and
* in-progress jobs (opd_sync_rpcs_in_progress), the thread will create one
* sycning RPC for each LLOG record and send it to corresponding OST for remote
* committing. Once RPC is reported committed by OST (using regular
* last_committed mechanism), the job is enqueued (into opd_sync_committed_there)
* for later cancelling of the corresponded LLOG record.
*
* opd_sync_changes is the number of unread LLOG records (to be processed).
* Please note that this number only includes the LLOG records newly
* accumulated since the newest start of the MDS service, but not includes the
* LLOG records saved in disk before that. Thus, the actual number of LLOG
* records might be larger than this.
*
* opd_sync_rpcs_in_flight is the in-flight RPC number. An syncing RPC is
* in-flight until the MDS received the reply from the corresponding OST (no
* matter the remote commit succeeded or failed). The total number of
* in-flight RPCs is limited by OSP_MAX_RPCS_IN_FLIGHT.
*
* opd_sync_rpcs_in_progress is the number of RPCs that is still in progress. A
* syncing RPC is consider to be in progress until its LLOG record got
* canceled. As we can see, an in-flight RPC is obviously still in progress.
* The total number of in-progress RPCs is limited by OSP_MAX_RPCS_IN_PROGRESS.
*/
#define OSP_MAX_RPCS_IN_FLIGHT 8
#define OSP_MAX_RPCS_IN_PROGRESS 16384
#define OSP_MAX_SYNC_CHANGES 2000000000
#define OSP_JOB_MAGIC 0x26112005
struct osp_job_req_args {
/** bytes reserved for ptlrpc_replay_req() */
struct ptlrpc_replay_async_args jra_raa;
struct list_head jra_committed_link;
struct list_head jra_in_flight_link;
struct llog_cookie jra_lcookie;
__u32 jra_magic;
};
static int osp_sync_add_commit_cb(const struct lu_env *env,
struct osp_device *d, struct thandle *th);
/**
* osp_sync_has_new_job() - Check for new changes to sync
* @d: OSP device
*
* Return:
* * %1 there are changes
* * %0 there are no changes
*/
static inline int osp_sync_has_new_job(struct osp_device *d)
{
return atomic_read(&d->opd_sync_changes) > 0 ||
d->opd_sync_prev_done == 0;
}
static inline int osp_sync_in_flight_conflict(struct osp_device *d,
struct llog_rec_hdr *h)
{
struct osp_job_req_args *jra;
struct ost_id ostid;
struct osp_job_args *ja;
int conflict = 0;
if (h == NULL || h->lrh_type == LLOG_GEN_REC ||
list_empty(&d->opd_sync_in_flight_list))
return conflict;
memset(&ostid, 0, sizeof(ostid));
switch (h->lrh_type) {
case MDS_UNLINK_REC: {
struct llog_unlink_rec *unlink = (struct llog_unlink_rec *)h;
ostid_set_seq(&ostid, unlink->lur_oseq);
if (ostid_set_id(&ostid, unlink->lur_oid)) {
CERROR("Bad %llu to set " DOSTID "\n",
(unsigned long long)(unlink->lur_oid),
POSTID(&ostid));
return 1;
}
}
break;
case MDS_UNLINK64_REC:
fid_to_ostid(&((struct llog_unlink64_rec *)h)->lur_fid, &ostid);
break;
case MDS_SETATTR64_REC:
ostid = ((struct llog_setattr64_rec *)h)->lsr_oi;
break;
default:
LBUG();
}
spin_lock(&d->opd_sync_lock);
list_for_each_entry(jra, &d->opd_sync_in_flight_list,
jra_in_flight_link) {
struct ptlrpc_request *req;
struct ost_body *body;
LASSERT(jra->jra_magic == OSP_JOB_MAGIC);
req = container_of((void *)jra, struct ptlrpc_request,
rq_async_args);
body = req_capsule_client_get(&req->rq_pill,
&RMF_OST_BODY);
LASSERT(body);
if (memcmp(&ostid, &body->oa.o_oi, sizeof(ostid)) == 0) {
spin_unlock(&d->opd_sync_lock);
return 1;
}
}
list_for_each_entry(ja, &d->opd_sync_error_list, ja_error_link) {
if (memcmp(&ostid, &ja->ja_body.oa.o_oi, sizeof(ostid)) == 0) {
conflict = 1;
break;
}
}
spin_unlock(&d->opd_sync_lock);
return conflict;
}
static inline int osp_sync_rpcs_in_progress_low(struct osp_device *d)
{
return atomic_read(&d->opd_sync_rpcs_in_progress) <
d->opd_sync_max_rpcs_in_progress;
}
/**
* osp_sync_rpcs_in_flight_low() - Check for room in the network pipe to OST
* @d: OSP device
*
* Return:
* * %1 there is room
* * %0 no room, the pipe is full
*/
static inline int osp_sync_rpcs_in_flight_low(struct osp_device *d)
{
return atomic_read(&d->opd_sync_rpcs_in_flight) <
d->opd_sync_max_rpcs_in_flight;
}
/**
* osp_sync_has_work() - Wake up check for the main sync thread
* @osp: OSP device
*
* Return:
* * %1 time to wake up
* * %0 no need to wake up
*/
static inline int osp_sync_has_work(struct osp_device *osp)
{
/* has new/old changes and low in-progress? */
if (osp_sync_has_new_job(osp) && osp_sync_rpcs_in_progress_low(osp) &&
osp_sync_rpcs_in_flight_low(osp) && osp->opd_imp_connected)
return 1;
/* has remotely committed? */
if (!list_empty(&osp->opd_sync_committed_there))
return 1;
return 0;
}
void osp_sync_check_for_work(struct osp_device *osp)
{
if (osp_sync_has_work(osp))
wake_up(&osp->opd_sync_waitq);
}
static inline __u64 osp_sync_correct_id(struct osp_device *d,
struct llog_rec_hdr *rec)
{
/*
* llog use cyclic store with 32 bit lrh_id
* so overflow lrh_id is possible. Range between
* last_processed and last_committed is less than
* 64745 ^ 2 and less than 2^32 - 1
*/
__u64 correct_id = d->opd_sync_last_committed_id;
if ((correct_id & 0xffffffffULL) < rec->lrh_id)
correct_id -= 0x100000000ULL;
correct_id &= ~0xffffffffULL;
correct_id |= rec->lrh_id;
return correct_id;
}
static inline bool osp_sync_can_send_delayed(struct osp_device *d)
{
struct osp_job_args *ja;
ktime_t now = ktime_get();
ENTRY;
if (likely(list_empty(&d->opd_sync_error_list)))
RETURN(false);
ja = list_first_entry(&d->opd_sync_error_list, typeof(*ja),
ja_error_link);
if (ktime_before(ja->ja_time, now)) {
CDEBUG(D_INFO, "can send delayed osp job %px "DOSTID"\n", ja,
POSTID(&ja->ja_body.oa.o_oi));
RETURN(true);
}
RETURN(false);
}
/**
* osp_sync_can_process_new() - Check and return ready-for-new status.
* @d: OSP device
* @rec: next llog record to process
*
* The thread processing llog record uses this function to check whether
* it's time to take another record and process it. The number of conditions
* must be met: the connection should be ready, RPCs in flight not exceeding
* the limit, the record is committed locally, etc (see the lines below).
*
* Return:
* * %0 not ready
* * %1 ready
*/
static inline int osp_sync_can_process_new(struct osp_device *d,
struct llog_rec_hdr *rec)
{
LASSERT(d);
if (unlikely(atomic_read(&d->opd_sync_barrier) > 0))
return 0;
if (unlikely(osp_sync_in_flight_conflict(d, rec)))
return 0;
if (!osp_sync_rpcs_in_progress_low(d))
return 0;
if (!osp_sync_rpcs_in_flight_low(d))
return 0;
if (!d->opd_imp_connected)
return 0;
if (d->opd_sync_prev_done == 0)
return 1;
if (osp_sync_can_send_delayed(d))
return 1;
if (atomic_read(&d->opd_sync_changes) == 0)
return 0;
if (rec == NULL)
return 1;
/* notice "<" not "<=" */
if (osp_sync_correct_id(d, rec) < d->opd_sync_last_committed_id)
return 1;
return 0;
}
/**
* osp_sync_declare_add() - Declare intention to add a new change.
* @env: LU environment provided by the caller
* @o: OSP object
* @type: type of change: MDS_UNLINK64_REC or MDS_SETATTR64_REC
* @th: transaction handle (local)
*
* With regard to OSD API, we have to declare any changes ahead. In this
* case we declare an intention to add a llog record representing the
* change on the local storage.
*
* Return:
* * %0 on success
* * %negative negated errno on error
*/
int osp_sync_declare_add(const struct lu_env *env, struct osp_object *o,
enum llog_op_type type, struct thandle *th)
{
struct osp_thread_info *osi = osp_env_info(env);
struct osp_device *d = lu2osp_dev(o->opo_obj.do_lu.lo_dev);
struct llog_ctxt *ctxt;
struct thandle *storage_th;
int rc;
ENTRY;
/* it's a layering violation, to access internals of th,
* but we can do this as a sanity check, for a while */
LASSERT(th->th_top != NULL);
if (atomic_read(&d->opd_sync_changes) > d->opd_sync_max_changes) {
/* Attempt to slow sync changes queuing rate */
CWARN("%s: queued changes counter exceeds limit %d > %d\n",
d->opd_obd->obd_name, atomic_read(&d->opd_sync_changes),
d->opd_sync_max_changes);
RETURN(-EINPROGRESS);
}
storage_th = thandle_get_sub_by_dt(env, th->th_top, d->opd_storage);
if (IS_ERR(storage_th))
RETURN(PTR_ERR(storage_th));
switch (type) {
case MDS_UNLINK64_REC:
osi->osi_hdr.lrh_len = sizeof(struct llog_unlink64_rec);
break;
case MDS_SETATTR64_REC:
osi->osi_hdr.lrh_len = sizeof(struct llog_setattr64_rec_v2);
break;
default:
LBUG();
}
ctxt = llog_get_context(d->opd_obd, LLOG_MDS_OST_ORIG_CTXT);
if (!ctxt) {
/* for a reason OSP wasn't able to open llog,
* just skip logging this operation and hope
* LFSCK will fix it eventually */
CERROR("logging isn't available, run LFSCK\n");
RETURN(0);
}
rc = llog_declare_add(env, ctxt->loc_handle, &osi->osi_hdr,
storage_th);
llog_ctxt_put(ctxt);
RETURN(rc);
}
#define OSP_SYNC_HEALTH_CHECK_PERIOD 20
#define OSP_SYNC_HEALTH_MAX_GROW_PERIODS 16
/*
* watch osp llog size to warn if it's been growing too large
*/
static void osp_sync_llog_health_check(struct osp_device *d,
struct llog_handle *lgh)
{
time64_t now = ktime_get_seconds();
struct llog_log_hdr *h;
int diff;
if (likely(now - d->opd_sync_llog_checked_at <=
OSP_SYNC_HEALTH_CHECK_PERIOD))
return;
if (!mutex_trylock(&d->opd_sync_health_mutex))
return;
d->opd_sync_llog_checked_at = now;
h = lgh->lgh_hdr;
if (unlikely(!h))
goto out;
if (d->opd_sync_llog_plains == 0) {
d->opd_sync_llog_plains = h->llh_count;
goto out;
}
/*
* if the catalog has less than 1/3, then
* something is wrong with llog processing
* or
* number of plain llogs has been just growing for long
*/
diff = (int)h->llh_count - d->opd_sync_llog_plains;
if (diff >= 0) {
d->opd_sync_llog_positive_nr++;
d->opd_sync_llog_total_diff += diff;
} else {
/* llog shrinked, reset the counter */
d->opd_sync_llog_positive_nr = 0;
d->opd_sync_llog_total_diff = 0;
}
if (h->llh_count > (8 * lgh->lgh_hdr_size * 2 / 3) ||
(d->opd_sync_llog_total_diff > 5 &&
d->opd_sync_llog_positive_nr > OSP_SYNC_HEALTH_MAX_GROW_PERIODS)) {
CWARN("%s: %d plain llogs, was %d, check MDS-OST sync (%d %d)\n",
d->opd_obd->obd_name, lgh->lgh_hdr->llh_count,
d->opd_sync_llog_plains, d->opd_sync_llog_total_diff,
d->opd_sync_llog_positive_nr);
d->opd_sync_llog_positive_nr = 0;
d->opd_sync_llog_total_diff = 0;
}
d->opd_sync_llog_plains = h->llh_count;
out:
mutex_unlock(&d->opd_sync_health_mutex);
}
/**
* osp_sync_add_rec() - Generate a llog record for a given change.
* @env: LU environment provided by the caller
* @d: OSP device
* @fid: fid of the object the change should be applied to
* @type: type of change: MDS_UNLINK64_REC or MDS_SETATTR64_REC
* @count: count of objects to destroy
* @th: transaction handle (local)
* @attr: attributes for setattr
*
* Generates a llog record for the change passed. The change can be of two
* types: unlink and setattr. The record gets an ID which later will be
* used to track commit status of the change. For unlink changes, the caller
* can supply a starting FID and the count of the objects to destroy. For
* setattr the caller should apply attributes to apply.
*
* Return:
* * %0 on success
* * %negative negated errno on error
*/
static int osp_sync_add_rec(const struct lu_env *env, struct osp_device *d,
const struct lu_fid *fid, enum llog_op_type type,
int count, struct thandle *th,
const struct lu_attr *attr)
{
struct osp_thread_info *osi = osp_env_info(env);
struct llog_ctxt *ctxt;
struct thandle *storage_th;
bool immediate_commit_cb = false;
int rc;
ENTRY;
/* it's a layering violation, to access internals of th,
* but we can do this as a sanity check, for a while */
LASSERT(th->th_top != NULL);
storage_th = thandle_get_sub_by_dt(env, th->th_top, d->opd_storage);
if (IS_ERR(storage_th))
RETURN(PTR_ERR(storage_th));
switch (type) {
case MDS_UNLINK64_REC:
osi->osi_hdr.lrh_len = sizeof(osi->osi_unlink);
osi->osi_hdr.lrh_type = MDS_UNLINK64_REC;
osi->osi_unlink.lur_fid = *fid;
osi->osi_unlink.lur_count = count;
break;
case MDS_SETATTR64_REC:
rc = fid_to_ostid(fid, &osi->osi_oi);
LASSERT(rc == 0);
osi->osi_hdr.lrh_len = sizeof(osi->osi_setattr);
osi->osi_hdr.lrh_type = MDS_SETATTR64_REC;
osi->osi_setattr.lsr_oi = osi->osi_oi;
LASSERT(attr);
osi->osi_setattr.lsr_uid = attr->la_uid;
osi->osi_setattr.lsr_gid = attr->la_gid;
osi->osi_setattr.lsr_layout_version = attr->la_layout_version;
osi->osi_setattr.lsr_projid = attr->la_projid;
osi->osi_setattr.lsr_valid =
((attr->la_valid & LA_UID) ? OBD_MD_FLUID : 0) |
((attr->la_valid & LA_GID) ? OBD_MD_FLGID : 0) |
((attr->la_valid & LA_PROJID) ? OBD_MD_FLPROJID : 0);
if (attr->la_valid & LA_LAYOUT_VERSION) {
osi->osi_setattr.lsr_valid |= OBD_MD_LAYOUT_VERSION;
/* FLR: the layout version has to be transferred to
* OST objects ASAP, otherwise clients will have to
* experience delay to be able to write OST objects. */
immediate_commit_cb = true;
}
break;
default:
LBUG();
}
/* we keep the same id, but increment it when the callback
* is registered, so that all records upto the one taken
* by the callback are subject to processing */
spin_lock(&d->opd_sync_lock);
osi->osi_hdr.lrh_id = d->opd_sync_last_used_id;
spin_unlock(&d->opd_sync_lock);
ctxt = llog_get_context(d->opd_obd, LLOG_MDS_OST_ORIG_CTXT);
if (ctxt == NULL) {
/* see comment in osp_sync_declare_add() */
RETURN(0);
}
osp_sync_llog_health_check(d, ctxt->loc_handle);
rc = llog_add(env, ctxt->loc_handle, &osi->osi_hdr, &osi->osi_cookie,
storage_th);
llog_ctxt_put(ctxt);
if (likely(rc >= 0)) {
CDEBUG(D_OTHER, "%s: new record "DFID".%u: rc = %d\n",
d->opd_obd->obd_name,
PLOGID(&osi->osi_cookie.lgc_lgl),
osi->osi_cookie.lgc_index, rc);
atomic_inc(&d->opd_sync_changes);
}
if (immediate_commit_cb)
rc = osp_sync_add_commit_cb(env, d, th);
else
rc = osp_sync_add_commit_cb_1s(env, d, th);
/* return 0 always here, error case just cause no llog record */
RETURN(0);
}
int osp_sync_add(const struct lu_env *env, struct osp_object *o,
enum llog_op_type type, struct thandle *th,
const struct lu_attr *attr)
{
return osp_sync_add_rec(env, lu2osp_dev(o->opo_obj.do_lu.lo_dev),
lu_object_fid(&o->opo_obj.do_lu), type, 1,
th, attr);
}
/*
* it's quite obvious we can't maintain all the structures in the memory:
* while OST is down, MDS can be processing thousands and thousands of unlinks
* filling persistent llogs and in-core respresentation
*
* this doesn't scale at all. so we need basically the following:
* a) destroy/setattr append llog records
* b) once llog has grown to X records, we process first Y committed records
*
* once record R is found via llog_process(), it becomes committed after any
* subsequent commit callback (at the most)
*/
/**
* osp_sync_request_commit_cb() - ptlrpc commit callback.
* @req: request (from MDS to OST)
*
* The callback is called by PTLRPC when a RPC is reported committed by the
* target (OST). We register the callback for the every RPC applying a change
* from the llog. This way we know then the llog records can be cancelled.
* Notice the callback can be called when OSP is finishing. We can detect this
* checking that actual transno in the request is less or equal of known
* committed transno (see osp_sync_process_committed() for the details).
* XXX: this is pretty expensive and can be improved later using batching.
*/
static void osp_sync_request_commit_cb(struct ptlrpc_request *req)
{
struct osp_device *d = req->rq_cb_data;
struct osp_job_req_args *jra;
CDEBUG(D_HA, "commit req %p, transno %llu\n", req, req->rq_transno);
if (unlikely(req->rq_transno == 0))
return;
/* do not do any opd_sync_rpcs_* accounting here
* it's done in osp_sync_interpret sooner or later */
LASSERT(d);
jra = ptlrpc_req_async_args(jra, req);
LASSERT(jra->jra_magic == OSP_JOB_MAGIC);
LASSERT(list_empty(&jra->jra_committed_link));
ptlrpc_request_addref(req);
spin_lock(&d->opd_sync_lock);
list_add(&jra->jra_committed_link, &d->opd_sync_committed_there);
spin_unlock(&d->opd_sync_lock);
/* XXX: some batching wouldn't hurt */
wake_up(&d->opd_sync_waitq);
}
/**
* osp_sync_interpret() - RPC interpretation callback.
* @env: LU environment provided by the caller
* @req: request replied
* @args: callback data
* @rc: result of RPC
*
* The callback is called by ptlrpc when RPC is replied. Now we have to decide
* whether we should:
* - put request on a special list to wait until it's committed by the target,
* if the request is successful
* - schedule llog record cancel if no target object is found
* - try later (essentially after reboot) in case of unexpected error
*
* Return 0 always
*/
static int osp_sync_interpret(const struct lu_env *env,
struct ptlrpc_request *req, void *args, int rc)
{
struct osp_job_req_args *jra = args;
struct osp_device *d = req->rq_cb_data;
if (jra->jra_magic != OSP_JOB_MAGIC) {
DEBUG_REQ(D_ERROR, req, "bad magic %u", jra->jra_magic);
LBUG();
}
LASSERT(d);
CDEBUG(D_HA, "reply req %p/%d, rc %d, transno %llu\n", req,
atomic_read(&req->rq_refcount), rc, req->rq_transno);
if (rc == -ENOENT) {
/*
* we tried to destroy object or update attributes,
* but object doesn't exist anymore - cancell llog record
*/
LASSERT(req->rq_transno == 0);
LASSERT(list_empty(&jra->jra_committed_link));
ptlrpc_request_addref(req);
spin_lock(&d->opd_sync_lock);
list_add(&jra->jra_committed_link,
&d->opd_sync_committed_there);
spin_unlock(&d->opd_sync_lock);
wake_up(&d->opd_sync_waitq);
} else if (rc) {
struct obd_import *imp = req->rq_import;
struct osp_job_args *ja = NULL;
/*
* error happened, we'll try to repeat on next boot ?
*/
LASSERTF(req->rq_transno == 0 || rc == -EIO || rc == -EROFS ||
req->rq_import_generation < imp->imp_generation,
"transno %llu, rc %d, gen: req %d, imp %d\n",
req->rq_transno, rc, req->rq_import_generation,
imp->imp_generation);
if (req->rq_transno == 0) {
/* this is the last time we see the request
* if transno is not zero, then commit cb
* will be called at some point */
LASSERT(atomic_read(&d->opd_sync_rpcs_in_progress) > 0);
atomic_dec(&d->opd_sync_rpcs_in_progress);
}
/* limit error list by 1K objects */
if (atomic_read(&d->opd_sync_error_count) < 1000)
OBD_ALLOC_PTR(ja);
if (likely(ja)) {
struct ost_body *body;
body = req_capsule_client_get(&req->rq_pill,
&RMF_OST_BODY);
memcpy(&ja->ja_body, &body->oa, sizeof(ja->ja_body));
ja->ja_lcookie = jra->jra_lcookie;
ja->ja_op = lustre_msg_get_opc(req->rq_reqmsg);
INIT_LIST_HEAD(&ja->ja_error_link);
/* repeat an operation after OBD_TIMEOUT / 10 */
ja->ja_time = ktime_add_ms(ktime_get(),
obd_timeout / 10 * MSEC_PER_SEC);
spin_lock(&d->opd_sync_lock);
list_add_tail(&ja->ja_error_link,
&d->opd_sync_error_list);
spin_unlock(&d->opd_sync_lock);
atomic_inc(&d->opd_sync_error_count);
CDEBUG(D_INFO, "Added %px object "DOSTID"\n", ja,
POSTID(&ja->ja_body.oa.o_oi));
}
wake_up(&d->opd_sync_waitq);
} else if (d->opd_pre != NULL &&
unlikely(d->opd_pre_status == -ENOSPC)) {
/*
* if current status is -ENOSPC (lack of free space on OST)
* then we should poll OST immediately once object destroy
* is replied
*/
osp_statfs_need_now(d);
}
spin_lock(&d->opd_sync_lock);
list_del_init(&jra->jra_in_flight_link);
spin_unlock(&d->opd_sync_lock);
LASSERT(atomic_read(&d->opd_sync_rpcs_in_flight) > 0);
atomic_dec(&d->opd_sync_rpcs_in_flight);
if (unlikely(atomic_read(&d->opd_sync_barrier) > 0))
wake_up(&d->opd_sync_barrier_waitq);
CDEBUG(D_OTHER, "%s: %d in flight, %d in progress\n",
d->opd_obd->obd_name, atomic_read(&d->opd_sync_rpcs_in_flight),
atomic_read(&d->opd_sync_rpcs_in_progress));
osp_sync_check_for_work(d);
return 0;
}
/**
* osp_sync_send_new_rpc() - Add request to ptlrpc queue.
* @d: OSP device
* @llh: llog handle where the record is stored
* @h: llog record
* @req: request (ready to be send)
*
* This is just a tiny helper function to put the request on the sending list
*/
static void osp_sync_send_new_rpc(struct osp_device *d,
struct llog_handle *llh,
struct llog_rec_hdr *h,
struct ptlrpc_request *req)
{
struct osp_job_req_args *jra;
LASSERT(atomic_read(&d->opd_sync_rpcs_in_flight) <=
d->opd_sync_max_rpcs_in_flight);
jra = ptlrpc_req_async_args(jra, req);
jra->jra_magic = OSP_JOB_MAGIC;
jra->jra_lcookie.lgc_lgl = llh->lgh_id;
jra->jra_lcookie.lgc_subsys = LLOG_MDS_OST_ORIG_CTXT;
jra->jra_lcookie.lgc_index = h->lrh_index;
INIT_LIST_HEAD(&jra->jra_committed_link);
spin_lock(&d->opd_sync_lock);
list_add_tail(&jra->jra_in_flight_link, &d->opd_sync_in_flight_list);
spin_unlock(&d->opd_sync_lock);
ptlrpcd_add_req(req);
}
/**
* osp_sync_new_job() - Allocate and prepare RPC for a new change.
* @d: OSP device
* @op: type of the change
*
* The function allocates and initializes an RPC which will be sent soon to
* apply the change to the target OST. The request is initialized from the
* llog record passed. Notice only the fields common to all type of changes
* are initialized.
*
* Return new request pointer on success or ERR_PTR(errno) on error
*/
static struct ptlrpc_request *osp_sync_new_job(struct osp_device *d,
enum ost_cmd op)
{
struct ptlrpc_request *req;
struct obd_import *imp;
struct req_format *format;
int rc;
ENTRY;
/* Prepare the request */
imp = d->opd_obd->u.cli.cl_import;
LASSERT(imp);
if (CFS_FAIL_CHECK(OBD_FAIL_OSP_CHECK_ENOMEM))
RETURN(ERR_PTR(-ENOMEM));
switch (op) {
case OST_DESTROY:
format = &RQF_OST_DESTROY;
break;
case OST_SETATTR:
format = &RQF_OST_SETATTR;
break;
default:
RETURN(ERR_PTR(-EOPNOTSUPP));
};
req = ptlrpc_request_alloc(imp, format);
if (req == NULL)
RETURN(ERR_PTR(-ENOMEM));
rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, op);
if (rc) {
ptlrpc_req_put(req);
RETURN(ERR_PTR(rc));
}
req->rq_interpret_reply = osp_sync_interpret;
req->rq_commit_cb = osp_sync_request_commit_cb;
req->rq_cb_data = d;
ptlrpc_request_set_replen(req);
RETURN(req);
}
/**
* osp_sync_new_setattr_job() - Generate a request for setattr change.
* @d: OSP device
* @llh: llog handle where the record is stored
* @h: llog record
*
* The function prepares a new RPC, initializes it with setattr specific
* bits and send the RPC.
*
* Return:
* * %0 on success
* * %1 on invalid record
* * %negative negated errno on error
*/
static int osp_sync_new_setattr_job(struct osp_device *d,
struct llog_handle *llh,
struct llog_rec_hdr *h)
{
struct llog_setattr64_rec *rec = (struct llog_setattr64_rec *)h;
struct ptlrpc_request *req;
struct ost_body *body;
ENTRY;
LASSERT(h->lrh_type == MDS_SETATTR64_REC);
if (CFS_FAIL_CHECK(OBD_FAIL_OSP_CHECK_INVALID_REC))
RETURN(1);
/* lsr_valid can only be 0 or HAVE OBD_MD_{FLUID, FLGID, FLPROJID} set,
* so no bits other than these should be set. */
if ((rec->lsr_valid & ~(OBD_MD_FLUID | OBD_MD_FLGID |
OBD_MD_FLPROJID | OBD_MD_LAYOUT_VERSION)) != 0) {
CERROR("%s: invalid setattr record, lsr_valid:%llu\n",
d->opd_obd->obd_name, rec->lsr_valid);
/* return 1 on invalid record */
RETURN(1);
}
req = osp_sync_new_job(d, OST_SETATTR);
if (IS_ERR(req))
RETURN(PTR_ERR(req));
body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
LASSERT(body);
body->oa.o_oi = rec->lsr_oi;
body->oa.o_uid = rec->lsr_uid;
body->oa.o_gid = rec->lsr_gid;
body->oa.o_valid = OBD_MD_FLGROUP | OBD_MD_FLID;
if (h->lrh_len > sizeof(struct llog_setattr64_rec)) {
struct llog_setattr64_rec_v2 *rec_v2 = (typeof(rec_v2))rec;
body->oa.o_projid = rec_v2->lsr_projid;
body->oa.o_layout_version = rec_v2->lsr_layout_version;
}
/* old setattr record (prior 2.6.0) doesn't have 'valid' stored,
* we assume that both UID and GID are valid in that case. */
if (rec->lsr_valid == 0)
body->oa.o_valid |= (OBD_MD_FLUID | OBD_MD_FLGID);
else
body->oa.o_valid |= rec->lsr_valid;
osp_sync_send_new_rpc(d, llh, h, req);
RETURN(0);
}
/**
* osp_sync_new_unlink_job() - Generate a request for unlink change.
* @d: OSP device
* @llh: llog handle where the record is stored
* @h: llog record
*
* The function prepares a new RPC, initializes it with unlink(destroy)
* specific bits and sends the RPC. The function is used to handle
* llog_unlink_rec which were used in the older versions of Lustre.
* Current version uses llog_unlink_rec64.
*
* Return:
* \retval 0 on success
* \retval negative negated errno on error
*/
static int osp_sync_new_unlink_job(struct osp_device *d,
struct llog_handle *llh,
struct llog_rec_hdr *h)
{
struct llog_unlink_rec *rec = (struct llog_unlink_rec *)h;
struct ptlrpc_request *req;
struct ost_body *body;
int rc;
ENTRY;
LASSERT(h->lrh_type == MDS_UNLINK_REC);
req = osp_sync_new_job(d, OST_DESTROY);
if (IS_ERR(req))
RETURN(PTR_ERR(req));
body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
LASSERT(body);
ostid_set_seq(&body->oa.o_oi, rec->lur_oseq);
rc = ostid_set_id(&body->oa.o_oi, rec->lur_oid);
if (rc) {
ptlrpc_req_put(req);
RETURN(rc);
}
body->oa.o_misc = rec->lur_count;
body->oa.o_valid = OBD_MD_FLGROUP | OBD_MD_FLID;
if (rec->lur_count)
body->oa.o_valid |= OBD_MD_FLOBJCOUNT;
osp_sync_send_new_rpc(d, llh, h, req);
RETURN(0);
}
/**
* osp_sync_new_unlink64_job() - Generate a request for unlink change.
* @d: OSP device
* @llh: llog handle where the record is stored
* @h: llog record
*
* The function prepares a new RPC, initializes it with unlink(destroy)
* specific bits and sends the RPC. Depending on the target (MDT or OST)
* two different protocols are used. For MDT we use OUT (basically OSD API
* updates transferred via a network). For OST we still use the old
* protocol (OBD?), originally for compatibility. Later we can start to
* use OUT for OST as well, this will allow batching and better code
* unification.
*
* Return:
* * %0 on success
* * %negative negated errno on error
*/
static int osp_sync_new_unlink64_job(struct osp_device *d,
struct llog_handle *llh,
struct llog_rec_hdr *h)
{
struct llog_unlink64_rec *rec = (struct llog_unlink64_rec *)h;
struct ptlrpc_request *req = NULL;
struct ost_body *body;
int rc;
ENTRY;
LASSERT(h->lrh_type == MDS_UNLINK64_REC);
req = osp_sync_new_job(d, OST_DESTROY);
if (IS_ERR(req))
RETURN(PTR_ERR(req));
body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
if (body == NULL) {
ptlrpc_req_put(req);
RETURN(-EFAULT);
}
rc = fid_to_ostid(&rec->lur_fid, &body->oa.o_oi);
if (rc < 0) {
ptlrpc_req_put(req);
RETURN(rc);
}
body->oa.o_misc = rec->lur_count;
body->oa.o_valid = OBD_MD_FLGROUP | OBD_MD_FLID |
OBD_MD_FLOBJCOUNT;
osp_sync_send_new_rpc(d, llh, h, req);
RETURN(0);
}
static int osp_sync_new_err_job(struct osp_device *d,
struct osp_job_args *ja)
{
struct ptlrpc_request *req = NULL;
struct ost_body *body;
struct osp_job_req_args *jra;
ENTRY;
req = osp_sync_new_job(d, ja->ja_op);
if (IS_ERR(req))
RETURN(PTR_ERR(req));
body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
if (body == NULL) {
ptlrpc_req_put(req);
RETURN(-EFAULT);
}
memcpy(body, &ja->ja_body, sizeof(*body));
LASSERT(atomic_read(&d->opd_sync_rpcs_in_flight) <=
d->opd_sync_max_rpcs_in_flight);
jra = ptlrpc_req_async_args(jra, req);
jra->jra_magic = OSP_JOB_MAGIC;
memcpy(&jra->jra_lcookie, &ja->ja_lcookie, sizeof(jra->jra_lcookie));
INIT_LIST_HEAD(&jra->jra_committed_link);
spin_lock(&d->opd_sync_lock);
list_add_tail(&jra->jra_in_flight_link, &d->opd_sync_in_flight_list);
spin_unlock(&d->opd_sync_lock);
CDEBUG(D_HA, "%s repeating %d operation object "DOSTID"\n",
d->opd_obd->obd_name, ja->ja_op, POSTID(&ja->ja_body.oa.o_oi));
atomic_dec(&d->opd_sync_error_count);
OBD_FREE_PTR(ja);
ptlrpcd_add_req(req);
RETURN(0);
}
/**
* osp_sync_process_record() - Process llog records.
* @env: LU environment provided by the caller
* @d: OSP device
* @llh: llog handle where the record is stored
* @rec: llog record
*
* This function is called to process the llog records committed locally.
* In the recovery model used by OSP we can apply a change to a remote
* target once corresponding transaction (like posix unlink) is committed
* locally so can't revert.
* Depending on the llog record type, a given handler is called that is
* responsible for preparing and sending the RPC to apply the change.
* Special record type LLOG_GEN_REC marking a reboot is cancelled right away.
*/
static void osp_sync_process_record(const struct lu_env *env,
struct osp_device *d,
struct llog_handle *llh,
struct llog_rec_hdr *rec)
{
struct llog_handle *cathandle = llh->u.phd.phd_cat_handle;
struct llog_cookie cookie;
int rc = 0;
ENTRY;
cookie.lgc_lgl = llh->lgh_id;
cookie.lgc_subsys = LLOG_MDS_OST_ORIG_CTXT;
cookie.lgc_index = rec->lrh_index;
d->opd_sync_last_catalog_idx = llh->lgh_hdr->llh_cat_idx;
if (unlikely(rec->lrh_type == LLOG_GEN_REC)) {
struct llog_gen_rec *gen = (struct llog_gen_rec *)rec;
/* we're waiting for the record generated by this instance */
LASSERT(d->opd_sync_prev_done == 0);
if (!memcmp(&d->opd_sync_generation, &gen->lgr_gen,
sizeof(gen->lgr_gen))) {
CDEBUG(D_HA, "processed all old entries\n");
d->opd_sync_prev_done = 1;
}
/* cancel any generation record */
rc = llog_cat_cancel_records(env, cathandle, 1, &cookie);
/* flush all pending records ASAP */
osp_sync_force(env, d);
RETURN_EXIT;
}
/*
* now we prepare and fill requests to OST, put them on the queue
* and fire after next commit callback
*/
/* notice we increment counters before sending RPC, to be consistent
* in RPC interpret callback which may happen very quickly */
atomic_inc(&d->opd_sync_rpcs_in_flight);
atomic_inc(&d->opd_sync_rpcs_in_progress);
switch (rec->lrh_type) {
/* case MDS_UNLINK_REC is kept for compatibility */
case MDS_UNLINK_REC:
rc = osp_sync_new_unlink_job(d, llh, rec);
break;
case MDS_UNLINK64_REC:
rc = osp_sync_new_unlink64_job(d, llh, rec);
break;
case MDS_SETATTR64_REC:
rc = osp_sync_new_setattr_job(d, llh, rec);
break;
default:
CERROR("%s: unknown record type: %x\n", d->opd_obd->obd_name,
rec->lrh_type);
/* treat "unknown record type" as "invalid" */
rc = 1;
break;
}
/* For all kinds of records, not matter successful or not,
* we should decrease changes and bump last_processed_id.
*/
if (d->opd_sync_prev_done) {
LASSERT(atomic_read(&d->opd_sync_changes) > 0);
atomic_dec(&d->opd_sync_changes);
wake_up(&d->opd_sync_barrier_waitq);
}
atomic64_inc(&d->opd_sync_processed_recs);
if (rc != 0) {
atomic_dec(&d->opd_sync_rpcs_in_flight);
atomic_dec(&d->opd_sync_rpcs_in_progress);
}
CDEBUG(D_OTHER, "%s: %d in flight, %d in progress\n",
d->opd_obd->obd_name, atomic_read(&d->opd_sync_rpcs_in_flight),
atomic_read(&d->opd_sync_rpcs_in_progress));
/* Delete the invalid record */
if (rc == 1) {
rc = llog_cat_cancel_records(env, cathandle, 1, &cookie);
if (rc != 0)
CERROR("%s: can't delete invalid record: fid = "
DFID", rec_id = %u, rc = %d\n",
d->opd_obd->obd_name,
PFID(lu_object_fid(&cathandle->lgh_obj->do_lu)),
rec->lrh_id, rc);
}
CDEBUG(D_OTHER, "found record %x, %d, idx %u, id %u\n",
rec->lrh_type, rec->lrh_len, rec->lrh_index, rec->lrh_id);
RETURN_EXIT;
}
/**
* osp_sync_process_committed() - Cancel llog records for the committed changes.
* @env: LU environment provided by the caller
* @d: OSP device
*
* The function walks through the list of the committed RPCs and cancels
* corresponding llog records. see osp_sync_request_commit_cb() for the
* details.
*/
static void osp_sync_process_committed(const struct lu_env *env,
struct osp_device *d)
{
struct obd_device *obd = d->opd_obd;
struct obd_import *imp = obd->u.cli.cl_import;
struct ost_body *body;
struct ptlrpc_request *req;
struct llog_ctxt *ctxt;
struct llog_handle *llh;
int *arr, arr_size;
LIST_HEAD(list);
struct list_head *le;
struct llog_logid lgid;
int rc, i, count = 0, done = 0;
ENTRY;
if (list_empty(&d->opd_sync_committed_there))
return;
/*
* if current status is -ENOSPC (lack of free space on OST)
* then we should poll OST immediately once object destroy
* is committed.
* notice: we do this upon commit as well because some backends
* (like DMU) do not release space right away.
*/
if (d->opd_pre != NULL && unlikely(d->opd_pre_status == -ENOSPC))
osp_statfs_need_now(d);
/*
* now cancel them all
* XXX: can we improve this using some batching?
* with batch RPC that'll happen automatically?
* XXX: can we store ctxt in lod_device and save few cycles ?
*/
ctxt = llog_get_context(obd, LLOG_MDS_OST_ORIG_CTXT);
LASSERT(ctxt);
llh = ctxt->loc_handle;
LASSERT(llh);
spin_lock(&d->opd_sync_lock);
list_splice(&d->opd_sync_committed_there, &list);
INIT_LIST_HEAD(&d->opd_sync_committed_there);
spin_unlock(&d->opd_sync_lock);
list_for_each(le, &list)
count++;
if (count > 2) {
arr_size = sizeof(int) * count;
/* limit cookie array to order 2 */
arr_size = arr_size < (PAGE_SIZE * 4) ? arr_size :
(PAGE_SIZE * 4);
OBD_ALLOC_LARGE(arr, arr_size);
} else {
arr = NULL;
arr_size = 0;
}
i = 0;
while (!list_empty(&list)) {
struct osp_job_req_args *jra;
jra = list_first_entry(&list, struct osp_job_req_args,
jra_committed_link);
LASSERT(jra->jra_magic == OSP_JOB_MAGIC);
list_del_init(&jra->jra_committed_link);
req = container_of((void *)jra, struct ptlrpc_request,
rq_async_args);
body = req_capsule_client_get(&req->rq_pill,
&RMF_OST_BODY);
LASSERT(body);
/* import can be closing, thus all commit cb's are
* called we can check committness directly */
if (req->rq_import_generation == imp->imp_generation) {
if (arr && (!i ||
!memcmp(&jra->jra_lcookie.lgc_lgl, &lgid,
sizeof(lgid)))) {
if (unlikely(!i))
lgid = jra->jra_lcookie.lgc_lgl;
arr[i++] = jra->jra_lcookie.lgc_index;
} else {
rc = llog_cat_cancel_records(env, llh, 1,
&jra->jra_lcookie);
if (rc)
CERROR("%s: can't cancel record: rc = %d\n",
obd->obd_name, rc);
}
} else {
DEBUG_REQ(D_OTHER, req, "imp_committed = %llu",
imp->imp_peer_committed_transno);
}
ptlrpc_req_put(req);
done++;
if (arr &&
((i * sizeof(int)) == arr_size ||
(list_empty(&list) && i > 0))) {
rc = llog_cat_cancel_arr_rec(env, llh, &lgid, i, arr);
CDEBUG(D_OTHER,
"%s: cancel %d records in "DFID": rc = %d\n",
obd->obd_name, i, PLOGID(&lgid), rc);
i = 0;
}
}
if (arr)
OBD_FREE_LARGE(arr, arr_size);
llog_ctxt_put(ctxt);
LASSERT(atomic_read(&d->opd_sync_rpcs_in_progress) >= done);
atomic_sub(done, &d->opd_sync_rpcs_in_progress);
CDEBUG((done > 2 ? D_HA : D_OTHER), "%s: %u changes, %u in progress, %u in flight, %u done\n",
d->opd_obd->obd_name,
atomic_read(&d->opd_sync_changes),
atomic_read(&d->opd_sync_rpcs_in_progress),
atomic_read(&d->opd_sync_rpcs_in_flight),
done);
osp_sync_check_for_work(d);
/* wake up the thread if requested to stop:
* it might be waiting for in-progress to complete
*/
if (atomic_read(&d->opd_sync_rpcs_in_progress) == 0)
wake_up(&d->opd_sync_waitq);
EXIT;
}
static bool osp_sync_process_error_list(const struct lu_env *env,
struct osp_device *d)
{
struct osp_job_args *ja;
ktime_t now = ktime_get();
if (likely(list_empty(&d->opd_sync_error_list)))
return false;
spin_lock(&d->opd_sync_lock);
ja = list_first_entry(&d->opd_sync_error_list, typeof(*ja),
ja_error_link);
if (ktime_before(ja->ja_time, now))
list_del_init(&ja->ja_error_link);
else
ja = NULL;
spin_unlock(&d->opd_sync_lock);
if (ja) {
/* same counters as osp_sync_process_record */
atomic_inc(&d->opd_sync_rpcs_in_flight);
atomic_inc(&d->opd_sync_rpcs_in_progress);
if (osp_sync_new_err_job(d, ja)) {
atomic_dec(&d->opd_sync_rpcs_in_flight);
atomic_dec(&d->opd_sync_rpcs_in_progress);
/* insert a ja back to list in case of error */
spin_lock(&d->opd_sync_lock);
list_add(&ja->ja_error_link, &d->opd_sync_error_list);
spin_unlock(&d->opd_sync_lock);
}
return true;
}
return false;
}
/**
* osp_sync_process_queues() - The core of the syncing mechanism.
* @env: LU environment provided by the caller
* @llh: llog handle we're processing
* @rec: current llog record
* @data: callback data containing a pointer to the device
*
* This is a callback called by the llog processing function. Essentially it
* suspends llog processing until there is a record to process (it's supposed
* to be committed locally). The function handles RPCs committed by the target
* and cancels corresponding llog records.
*
* Return:
* * %0 to ask the caller (llog_process()) to continue
* * %LLOG_PROC_BREAK to ask the caller to break
*/
static int osp_sync_process_queues(const struct lu_env *env,
struct llog_handle *llh,
struct llog_rec_hdr *rec,
void *data)
{
struct osp_device *d = data;
long timeout = 1;
do {
if (!d->opd_sync_task) {
CDEBUG(D_HA, "stop llog processing\n");
return LLOG_PROC_BREAK;
}
/* process requests committed by OST */
osp_sync_process_committed(env, d);
/* if we there are changes to be processed and we have
* resources for this ... do now */
if (osp_sync_can_process_new(d, rec)) {
if (osp_sync_process_error_list(env, d))
continue;
if (timeout) {
if (llh == NULL) {
/* ask llog for another record */
return 0;
}
osp_sync_process_record(env, d, llh, rec);
llh = NULL;
rec = NULL;
}
}
if (CFS_FAIL_PRECHECK(OBD_FAIL_CATALOG_FULL_CHECK) &&
cfs_fail_val != 1)
msleep(1 * MSEC_PER_SEC);
if (list_empty(&d->opd_sync_error_list)) {
wait_event_idle(d->opd_sync_waitq,
!d->opd_sync_task ||
osp_sync_can_process_new(d, rec) ||
!list_empty(&d->opd_sync_committed_there));
} else {
timeout = wait_event_idle_timeout(d->opd_sync_waitq,
!d->opd_sync_task ||
osp_sync_can_process_new(d, rec) ||
!list_empty(&d->opd_sync_committed_there),
cfs_time_seconds(1));
}
} while (1);
}
struct osp_sync_args {
struct osp_device *osa_dev;
struct completion *osa_started;
};
/**
* osp_sync_thread() - OSP sync thread.
* @_args: a pointer to thread's arguments
*
* This thread runs llog_cat_process() scanner calling our callback
* to process llog records. in the callback we implement tricky
* state machine as we don't want to start scanning of the llog again
* and again, also we don't want to process too many records and send
* too many RPCs a time. so, depending on current load (num of changes
* being synced to OST) the callback can suspend awaiting for some
* new conditions, like syncs completed.
*
* In order to process llog records left by previous boots and to allow
* llog_process_thread() to find something (otherwise it'd just exit
* immediately) we add a special GENERATATION record on each boot.
*
* Return:
* * %0 on success
* * %negative negated errno on error
*/
static int osp_sync_thread(void *_args)
{
struct osp_sync_args *args = _args;
struct osp_device *d = args->osa_dev;
struct llog_ctxt *ctxt;
struct obd_device *obd = d->opd_obd;
struct llog_handle *llh;
struct osp_job_args *ja, *tmp;
struct lu_env env;
int rc, count;
bool wrapped;
ENTRY;
complete(args->osa_started);
rc = lu_env_init(&env, LCT_LOCAL);
if (rc) {
CERROR("%s: can't initialize env: rc = %d\n",
d->opd_obd->obd_name, rc);
RETURN(rc);
}
rc = lu_env_add(&env);
if (unlikely(rc))
GOTO(out_fini, rc);
again:
ctxt = llog_get_context(obd, LLOG_MDS_OST_ORIG_CTXT);
if (ctxt == NULL) {
CERROR("can't get appropriate context\n");
GOTO(out, rc = -EINVAL);
}
llh = ctxt->loc_handle;
if (llh == NULL) {
CERROR("can't get llh\n");
llog_ctxt_put(ctxt);
GOTO(out, rc = -EINVAL);
}
/*
* Catalog processing stops when it processed last catalog record
* with index equal to the end of catalog bitmap. Or if it is wrapped,
* processing stops with index equal to the lgh_last_idx. We need to
* continue processing.
*/
d->opd_sync_last_catalog_idx = 0;
do {
int size;
wrapped = llog_cat_is_wrapped(llh);
if (CFS_FAIL_CHECK(OBD_FAIL_OSP_CANT_PROCESS_LLOG)) {
rc = -EINPROGRESS;
goto next;
}
rc = llog_cat_process(&env, llh, osp_sync_process_queues, d,
d->opd_sync_last_catalog_idx, 0);
next:
size = llog_max_idx(llh);
/* processing reaches catalog bottom */
if (d->opd_sync_last_catalog_idx == size)
d->opd_sync_last_catalog_idx = 1;
else if (wrapped)
d->opd_sync_last_catalog_idx++;
/* If catalog is wrapped we can`t predict last index of
* processing because lgh_last_idx could be changed.
* Starting form the next one. Index would be increased
* at llog_process_thread
*/
} while (rc == 0 && (wrapped ||
d->opd_sync_last_catalog_idx == 1));
if (rc < 0) {
if (rc == -EINPROGRESS) {
/* can't access the llog now - OI scrub is trying to fix
* underlying issue. let's wait and try again */
llog_cat_close(&env, llh);
rc = llog_cleanup(&env, ctxt);
if (rc)
GOTO(out, rc);
schedule_timeout_interruptible(cfs_time_seconds(5));
goto again;
}
CERROR("%s: llog process with osp_sync_process_queues failed: %d\n",
d->opd_obd->obd_name, rc);
GOTO(wait, rc);
}
LASSERTF(rc == 0 || rc == LLOG_PROC_BREAK,
"%u changes, %u in progress, %u in flight: %d\n",
atomic_read(&d->opd_sync_changes),
atomic_read(&d->opd_sync_rpcs_in_progress),
atomic_read(&d->opd_sync_rpcs_in_flight), rc);
/* we don't expect llog_process_thread() to exit till umount */
LASSERTF(kthread_should_stop(),
"%u changes, %u in progress, %u in flight\n",
atomic_read(&d->opd_sync_changes),
atomic_read(&d->opd_sync_rpcs_in_progress),
atomic_read(&d->opd_sync_rpcs_in_flight));
wait:
/* wait till all the requests are completed */
count = 0;
while (atomic_read(&d->opd_sync_rpcs_in_progress) > 0) {
osp_sync_process_committed(&env, d);
rc = wait_event_idle_timeout(
d->opd_sync_waitq,
atomic_read(&d->opd_sync_rpcs_in_progress) == 0,
cfs_time_seconds(5));
if (rc == 0)
count++;
LASSERTF(count < 10, "%s: %d %d %sempty\n",
d->opd_obd->obd_name,
atomic_read(&d->opd_sync_rpcs_in_progress),
atomic_read(&d->opd_sync_rpcs_in_flight),
list_empty(&d->opd_sync_committed_there) ? "" : "!");
}
llog_cat_close(&env, llh);
rc = llog_cleanup(&env, ctxt);
if (rc)
CERROR("can't cleanup llog: %d\n", rc);
list_for_each_entry_safe(ja, tmp, &d->opd_sync_error_list,
ja_error_link) {
CDEBUG(D_HA, "%s: failed to sync object "DOSTID"\n",
d->opd_obd->obd_name, POSTID(&ja->ja_body.oa.o_oi));
list_del(&ja->ja_error_link);
OBD_FREE_PTR(ja);
}
out:
LASSERTF(atomic_read(&d->opd_sync_rpcs_in_progress) == 0,
"%s: %d %d %sempty\n", d->opd_obd->obd_name,
atomic_read(&d->opd_sync_rpcs_in_progress),
atomic_read(&d->opd_sync_rpcs_in_flight),
list_empty(&d->opd_sync_committed_there) ? "" : "!");
if (xchg(&d->opd_sync_task, NULL) == NULL)
/* already being waited for */
wait_event_interruptible(d->opd_sync_waitq,
kthread_should_stop());
rc = 0;
lu_env_remove(&env);
out_fini:
lu_env_fini(&env);
OBD_FREE_PTR(args);
RETURN(rc);
}
/**
* osp_sync_llog_init() - Initialize llog.
* @env: LU environment provided by the caller
* @d: OSP device
*
* Initializes the llog. Specific llog to be used depends on the type of the
* target OSP represents (OST or MDT). The function adds appends a new llog
* record to mark the place where the records associated with this boot
* start.
*
* Return:
* * %0 on success
* * %negative negated errno on error
*/
static int osp_sync_llog_init(const struct lu_env *env, struct osp_device *d)
{
struct osp_thread_info *osi = osp_env_info(env);
struct lu_fid *fid = &osi->osi_fid;
struct llog_handle *lgh = NULL;
struct obd_device *obd = d->opd_obd;
struct llog_ctxt *ctxt;
int rc;
ENTRY;
LASSERT(obd);
/*
* open llog corresponding to our OST
*/
OBD_SET_CTXT_MAGIC(&obd->obd_lvfs_ctxt);
obd->obd_lvfs_ctxt.dt = d->opd_storage;
lu_local_obj_fid(fid, LLOG_CATALOGS_OID);
rc = llog_osd_get_cat_list(env, d->opd_storage, d->opd_index, 1,
&osi->osi_cid, fid);
if (rc < 0) {
if (rc != -EFAULT) {
CERROR("%s: can't get id from catalogs: rc = %d\n",
obd->obd_name, rc);
RETURN(rc);
}
/* After sparse OST indices is supported, the CATALOG file
* may become a sparse file that results in failure on
* reading. Skip this error as the llog will be created
* later */
memset(&osi->osi_cid, 0, sizeof(osi->osi_cid));
rc = 0;
}
CDEBUG(D_INFO, "%s: init llog for %d - catid "DFID"\n",
obd->obd_name, d->opd_index, PLOGID(&osi->osi_cid.lci_logid));
rc = llog_setup(env, obd, &obd->obd_olg, LLOG_MDS_OST_ORIG_CTXT,
d->opd_storage->dd_lu_dev.ld_obd,
&llog_common_cat_ops);
if (rc)
RETURN(rc);
ctxt = llog_get_context(obd, LLOG_MDS_OST_ORIG_CTXT);
LASSERT(ctxt);
if (likely(logid_id(&osi->osi_cid.lci_logid) != 0)) {
struct lu_fid fid_temp;
if (CFS_FAIL_CHECK(OBD_FAIL_OSP_INVALID_LOGID)) {
memset(&osi->osi_cid, 0, sizeof(osi->osi_cid));
logid_set_id(&osi->osi_cid.lci_logid, cfs_fail_val);
}
logid_to_fid(&osi->osi_cid.lci_logid, &fid_temp);
if (fid_is_sane(&fid_temp)) {
rc = llog_open(env, ctxt, &lgh, &osi->osi_cid.lci_logid,
NULL, LLOG_OPEN_EXISTS);
/* re-create llog if it is missing */
if (rc == -ENOENT)
logid_set_id(&osi->osi_cid.lci_logid, 0);
else if (rc < 0)
GOTO(out_cleanup, rc);
} else {
CERROR("%s: the catid "DFID" for init llog %d is bad\n",
obd->obd_name, PFID(&fid_temp), d->opd_index);
/* it will be recreated later */
logid_set_id(&osi->osi_cid.lci_logid, 0);
}
}
if (unlikely(logid_id(&osi->osi_cid.lci_logid) == 0)) {
rc = llog_open_create(env, ctxt, &lgh, NULL, NULL);
if (rc < 0)
GOTO(out_cleanup, rc);
osi->osi_cid.lci_logid = lgh->lgh_id;
}
LASSERT(lgh != NULL);
ctxt->loc_handle = lgh;
rc = llog_init_handle(env, lgh, LLOG_F_IS_CAT | LLOG_F_RM_ON_ERR, NULL);
if (rc)
GOTO(out_close, rc);
rc = llog_osd_put_cat_list(env, d->opd_storage, d->opd_index, 1,
&osi->osi_cid, fid);
if (rc)
GOTO(out_close, rc);
/*
* put a mark in the llog till which we'll be processing
* old records restless
*/
d->opd_sync_generation.mnt_cnt = ktime_get_ns();
d->opd_sync_generation.conn_cnt = ktime_get_ns();
osi->osi_hdr.lrh_type = LLOG_GEN_REC;
osi->osi_hdr.lrh_len = sizeof(osi->osi_gen);
memcpy(&osi->osi_gen.lgr_gen, &d->opd_sync_generation,
sizeof(osi->osi_gen.lgr_gen));
rc = llog_cat_add(env, lgh, &osi->osi_gen.lgr_hdr, &osi->osi_cookie);
if (rc < 0)
GOTO(out_close, rc);
llog_ctxt_put(ctxt);
RETURN(0);
out_close:
llog_cat_close(env, lgh);
out_cleanup:
llog_cleanup(env, ctxt);
RETURN(rc);
}
/**
* osp_sync_llog_fini() - Cleanup llog used for syncing.
* @env: LU environment provided by the caller
* @d: OSP device
*
* Closes and cleanups the llog. The function is called when the device is
* shutting down.
*/
static void osp_sync_llog_fini(const struct lu_env *env, struct osp_device *d)
{
struct llog_ctxt *ctxt;
ctxt = llog_get_context(d->opd_obd, LLOG_MDS_OST_ORIG_CTXT);
if (ctxt) {
llog_cat_close(env, ctxt->loc_handle);
llog_cleanup(env, ctxt);
}
}
/**
* osp_sync_init() - Initialization of the sync component of OSP.
* @env: LU environment provided by the caller
* @d: OSP device
*
* Initializes the llog and starts a new thread to handle the changes to
* the remote target (OST or MDT).
*
* Return:
* * %0 on success
* * %negative negated errno on error
*/
int osp_sync_init(const struct lu_env *env, struct osp_device *d)
{
struct task_struct *task;
struct osp_sync_args *args;
DECLARE_COMPLETION_ONSTACK(started);
int rc;
ENTRY;
d->opd_sync_max_rpcs_in_flight = OSP_MAX_RPCS_IN_FLIGHT;
d->opd_sync_max_rpcs_in_progress = OSP_MAX_RPCS_IN_PROGRESS;
d->opd_sync_max_changes = OSP_MAX_SYNC_CHANGES;
spin_lock_init(&d->opd_sync_lock);
init_waitqueue_head(&d->opd_sync_waitq);
init_waitqueue_head(&d->opd_sync_barrier_waitq);
INIT_LIST_HEAD(&d->opd_sync_in_flight_list);
INIT_LIST_HEAD(&d->opd_sync_committed_there);
INIT_LIST_HEAD(&d->opd_sync_error_list);
atomic_set(&d->opd_sync_error_count, 0);
mutex_init(&d->opd_sync_health_mutex);
if (d->opd_storage->dd_rdonly)
RETURN(0);
OBD_ALLOC_PTR(args);
if (!args)
GOTO(err_id, rc = -ENOMEM);
args->osa_dev = d;
args->osa_started = &started;
/*
* initialize llog storing changes
*/
rc = osp_sync_llog_init(env, d);
if (rc) {
CERROR("%s: can't initialize llog: rc = %d\n",
d->opd_obd->obd_name, rc);
GOTO(err_id, rc);
}
/*
* Start synchronization thread
*/
task = kthread_create(osp_sync_thread, args, "osp-syn-%u-%u",
d->opd_index, d->opd_group);
if (IS_ERR(task)) {
rc = PTR_ERR(task);
CERROR("%s: cannot start sync thread: rc = %d\n",
d->opd_obd->obd_name, rc);
GOTO(err_llog, rc);
}
d->opd_sync_task = task;
wake_up_process(task);
wait_for_completion(&started);
RETURN(0);
err_llog:
osp_sync_llog_fini(env, d);
err_id:
OBD_FREE_PTR(args);
return rc;
}
/**
* osp_sync_fini() - Stop the syncing thread.
* @d: OSP device
*
* Asks the syncing thread to stop and wait until it's stopped.
*
* Return 0
*/
int osp_sync_fini(struct osp_device *d)
{
struct task_struct *task;
ENTRY;
task = xchg(&d->opd_sync_task, NULL);
if (task)
kthread_stop(task);
RETURN(0);
}
struct osp_last_committed_cb {
struct dt_txn_commit_cb ospc_cb;
struct osp_device *ospc_dev;
__u64 ospc_transno;
};
static void osp_sync_local_commit_cb(struct lu_env *env, struct thandle *th,
struct dt_txn_commit_cb *dcb, int err)
{
struct osp_last_committed_cb *cb;
struct osp_device *d;
cb = container_of(dcb, struct osp_last_committed_cb, ospc_cb);
d = cb->ospc_dev;
CDEBUG(D_HA, "%s: %llu committed\n", d->opd_obd->obd_name,
cb->ospc_transno);
spin_lock(&d->opd_sync_lock);
if (cb->ospc_transno > d->opd_sync_last_committed_id)
d->opd_sync_last_committed_id = cb->ospc_transno;
spin_unlock(&d->opd_sync_lock);
osp_sync_check_for_work(d);
lu_device_put(osp2lu_dev(d));
if (atomic_dec_and_test(&d->opd_commits_registered))
wake_up(&d->opd_sync_waitq);
OBD_FREE_PTR(cb);
}
static int osp_sync_add_commit_cb(const struct lu_env *env,
struct osp_device *d, struct thandle *th)
{
struct osp_last_committed_cb *cb;
struct dt_txn_commit_cb *dcb;
int rc = 0;
OBD_ALLOC_PTR(cb);
if (cb == NULL)
return -ENOMEM;
cb->ospc_dev = d;
dcb = &cb->ospc_cb;
dcb->dcb_func = osp_sync_local_commit_cb;
spin_lock(&d->opd_sync_lock);
cb->ospc_transno = ++d->opd_sync_last_used_id;
spin_unlock(&d->opd_sync_lock);
rc = dt_trans_cb_add(th, dcb);
CDEBUG(D_HA, "%s: add commit cb at %lluns, next at %lluns, rc = %d\n",
d->opd_obd->obd_name, ktime_get_ns(),
ktime_to_ns(d->opd_sync_next_commit_cb), rc);
if (likely(rc == 0)) {
lu_device_get(osp2lu_dev(d));
atomic_inc(&d->opd_commits_registered);
} else
OBD_FREE_PTR(cb);
return rc;
}
/* add the commit callback every second */
int osp_sync_add_commit_cb_1s(const struct lu_env *env, struct osp_device *d,
struct thandle *th)
{
ktime_t now = ktime_get();
bool add = false;
/* fast path */
if (ktime_before(now, d->opd_sync_next_commit_cb))
return 0;
spin_lock(&d->opd_sync_lock);
if (ktime_before(d->opd_sync_next_commit_cb, now)) {
add = true;
d->opd_sync_next_commit_cb = ktime_add_ns(now, NSEC_PER_SEC);
}
spin_unlock(&d->opd_sync_lock);
if (!add)
return 0;
return osp_sync_add_commit_cb(env, d, th);
}
/*
* generate an empty transaction and hook the commit callback in
* then force transaction commit
*/
void osp_sync_force(const struct lu_env *env, struct osp_device *d)
{
struct thandle *th;
int rc;
th = dt_trans_create(env, d->opd_storage);
if (IS_ERR(th)) {
CERROR("%s: can't sync\n", d->opd_obd->obd_name);
return;
}
rc = dt_trans_start_local(env, d->opd_storage, th);
if (rc == 0) {
CDEBUG(D_OTHER, "%s: sync forced, %d changes\n",
d->opd_obd->obd_name,
atomic_read(&d->opd_sync_changes));
rc = osp_sync_add_commit_cb(env, d, th);
dt_trans_stop(env, d->opd_storage, th);
}
dt_commit_async(env, d->opd_storage);
}
