Viewing: mdt_recovery.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) 2011, 2017, Intel Corporation.
*/
/*
* This file is part of Lustre, http://www.lustre.org/
*
* Lustre Metadata Target (mdt) recovery-related methods
*
* Author: Huang Hua <huanghua@clusterfs.com>
* Author: Pershin Mike <tappro@clusterfs.com>
*/
#define DEBUG_SUBSYSTEM S_MDS
#include "mdt_internal.h"
/* reconstruction code */
static void mdt_steal_ack_locks(struct ptlrpc_request *req)
{
struct ptlrpc_service_part *svcpt;
struct obd_export *exp = req->rq_export;
struct list_head *tmp;
struct ptlrpc_reply_state *rs;
int i;
/* CAVEAT EMPTOR: spinlock order */
spin_lock(&exp->exp_lock);
list_for_each(tmp, &exp->exp_outstanding_replies) {
rs = list_entry(tmp, struct ptlrpc_reply_state,
rs_exp_list);
if (rs->rs_xid != req->rq_xid)
continue;
if (rs->rs_opc != lustre_msg_get_opc(req->rq_reqmsg))
CERROR("%s: Resent req xid %llu has mismatched opc: new %d old %d\n",
exp->exp_obd->obd_name, req->rq_xid,
lustre_msg_get_opc(req->rq_reqmsg), rs->rs_opc);
svcpt = rs->rs_svcpt;
CDEBUG(D_HA,
"Stealing %d locks from rs %p x%lld.t%lld o%d NID %s\n",
rs->rs_nlocks, rs,
rs->rs_xid, rs->rs_transno, rs->rs_opc,
obd_export_nid2str(exp));
spin_lock(&svcpt->scp_rep_lock);
list_del_init(&rs->rs_exp_list);
spin_lock(&rs->rs_lock);
for (i = 0; i < rs->rs_nlocks; i++)
ptlrpc_save_lock(req, &rs->rs_locks[i], rs->rs_no_ack);
rs->rs_nlocks = 0;
DEBUG_REQ(D_HA, req, "stole locks for");
ptlrpc_schedule_difficult_reply(rs);
spin_unlock(&rs->rs_lock);
spin_unlock(&svcpt->scp_rep_lock);
break;
}
spin_unlock(&exp->exp_lock);
/* if exp_disconnected, decref stolen locks */
if (exp->exp_disconnected) {
rs = req->rq_reply_state;
for (i = 0; i < rs->rs_nlocks; i++)
ldlm_lock_decref(&rs->rs_locks[i], LCK_TXN);
rs->rs_nlocks = 0;
}
}
__u64 mdt_req_from_lrd(struct ptlrpc_request *req,
struct tg_reply_data *trd)
{
struct lsd_reply_data *lrd;
LASSERT(trd != NULL);
lrd = &trd->trd_reply;
DEBUG_REQ(D_HA, req, "restoring transno");
req->rq_transno = lrd->lrd_transno;
req->rq_status = lrd->lrd_result;
lustre_msg_set_versions(req->rq_repmsg, trd->trd_pre_versions);
if (req->rq_status != 0)
req->rq_transno = 0;
lustre_msg_set_transno(req->rq_repmsg, req->rq_transno);
lustre_msg_set_status(req->rq_repmsg, req->rq_status);
DEBUG_REQ(D_WARNING, req, "restoring transno");
mdt_steal_ack_locks(req);
return lrd->lrd_data;
}
void mdt_reconstruct_generic(struct mdt_thread_info *mti,
struct mdt_lock_handle *lhc)
{
struct ptlrpc_request *req = mdt_info_req(mti);
mdt_req_from_lrd(req, mti->mti_reply_data);
}
/**
* mdt_fake_ma() - Generate fake attributes for a non-existing object
* @ma: attributes to fill
*
* While the client was waiting for the reply, the original transaction
* got committed and corresponding rep-ack lock got released, then another
* client was able to destroy the object. But we still need to send some
* attributes back. So we fake them and set nlink=0, so the client will
* be able to detect a non-existing object and drop it from the cache
* immediately.
*/
static void mdt_fake_ma(struct md_attr *ma)
{
ma->ma_valid = MA_INODE;
memset(&ma->ma_attr, 0, sizeof(ma->ma_attr));
ma->ma_attr.la_valid = LA_NLINK;
ma->ma_attr.la_mode = S_IFREG;
}
static void mdt_reconstruct_create(struct mdt_thread_info *mti,
struct mdt_lock_handle *lhc)
{
struct ptlrpc_request *req = mdt_info_req(mti);
struct obd_export *exp = req->rq_export;
struct mdt_device *mdt = mti->mti_mdt;
struct md_attr *ma = &mti->mti_attr;
struct mdt_object *child;
struct mdt_body *body;
int rc;
ENTRY;
mdt_req_from_lrd(req, mti->mti_reply_data);
if (req->rq_status)
return;
/* if no error, so child was created with requested fid */
child = mdt_object_find(mti->mti_env, mdt, mti->mti_rr.rr_fid2);
if (IS_ERR(child)) {
rc = PTR_ERR(child);
LCONSOLE_WARN("cannot lookup child "DFID": rc = %d; "
"evicting client %s with export %s\n",
PFID(mti->mti_rr.rr_fid2), rc,
obd_uuid2str(&exp->exp_client_uuid),
obd_export_nid2str(exp));
mdt_export_evict(exp);
RETURN_EXIT;
}
body = req_capsule_server_get(mti->mti_pill, &RMF_MDT_BODY);
ma->ma_need = MA_INODE;
if (S_ISDIR(ma->ma_attr.la_mode) &&
(mti->mti_spec.sp_cr_flags & MDS_MKDIR_LMV))
mdt_prep_ma_buf_from_rep(mti, child, ma, 0);
ma->ma_valid = 0;
rc = mdt_attr_get_complex(mti, child, ma);
if (rc == -ENOENT) {
mdt_fake_ma(ma);
} else if (rc == -EREMOTE) {
/* object was created on remote server */
if (!mdt_is_dne_client(exp))
/* Return -EIO for old client */
rc = -EIO;
req->rq_status = rc;
body->mbo_valid |= OBD_MD_MDS;
}
if (ma->ma_valid & MA_LMV) {
body->mbo_eadatasize = ma->ma_lmv_size;
body->mbo_valid |= (OBD_MD_FLDIREA|OBD_MD_MEA);
}
mdt_pack_attr2body(mti, body, &ma->ma_attr, mdt_object_fid(child));
mdt_object_put(mti->mti_env, child);
RETURN_EXIT;
}
static void mdt_reconstruct_setattr(struct mdt_thread_info *mti,
struct mdt_lock_handle *lhc)
{
struct ptlrpc_request *req = mdt_info_req(mti);
struct obd_export *exp = req->rq_export;
struct mdt_device *mdt = mti->mti_mdt;
struct mdt_object *obj;
struct mdt_body *body;
int rc;
mdt_req_from_lrd(req, mti->mti_reply_data);
if (req->rq_status)
return;
body = req_capsule_server_get(mti->mti_pill, &RMF_MDT_BODY);
obj = mdt_object_find(mti->mti_env, mdt, mti->mti_rr.rr_fid1);
if (IS_ERR(obj)) {
rc = PTR_ERR(obj);
LCONSOLE_WARN("cannot lookup "DFID": rc = %d; "
"evicting client %s with export %s\n",
PFID(mti->mti_rr.rr_fid1), rc,
obd_uuid2str(&exp->exp_client_uuid),
obd_export_nid2str(exp));
mdt_export_evict(exp);
RETURN_EXIT;
}
mti->mti_attr.ma_need = MA_INODE;
mti->mti_attr.ma_valid = 0;
rc = mdt_attr_get_complex(mti, obj, &mti->mti_attr);
if (rc == -ENOENT)
mdt_fake_ma(&mti->mti_attr);
mdt_pack_attr2body(mti, body, &mti->mti_attr.ma_attr,
mdt_object_fid(obj));
mdt_object_put(mti->mti_env, obj);
}
typedef void (*mdt_reconstructor)(struct mdt_thread_info *mti,
struct mdt_lock_handle *lhc);
static mdt_reconstructor reconstructors[REINT_MAX] = {
[REINT_SETATTR] = mdt_reconstruct_setattr,
[REINT_CREATE] = mdt_reconstruct_create,
[REINT_LINK] = mdt_reconstruct_generic,
[REINT_UNLINK] = mdt_reconstruct_generic,
[REINT_RENAME] = mdt_reconstruct_generic,
[REINT_OPEN] = mdt_reconstruct_open,
[REINT_SETXATTR] = mdt_reconstruct_generic,
[REINT_RMENTRY] = mdt_reconstruct_generic,
[REINT_MIGRATE] = mdt_reconstruct_generic,
[REINT_RESYNC] = mdt_reconstruct_generic
};
void mdt_reconstruct(struct mdt_thread_info *mti, struct mdt_lock_handle *lhc)
{
mdt_reconstructor reconst;
ENTRY;
reconst = reconstructors[mti->mti_rr.rr_opcode];
LASSERT(reconst != NULL);
reconst(mti, lhc);
EXIT;
}
