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|
/*
* GPL HEADER START
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 only,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License version 2 for more details (a copy is included
* in the LICENSE file that accompanied this code).
*
* You should have received a copy of the GNU General Public License
* version 2 along with this program; If not, see
* http://www.gnu.org/licenses/gpl-2.0.html
*
* GPL HEADER END
*/
/*
* Copyright (c) 2004, 2010, Oracle and/or its affiliates. All rights reserved.
* Use is subject to license terms.
*
* Copyright (c) 2011, 2015, Intel Corporation.
*/
/*
* This file is part of Lustre, http://www.lustre.org/
* Lustre is a trademark of Sun Microsystems, Inc.
*/
#define DEBUG_SUBSYSTEM S_LMV
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/pagemap.h>
#include <asm/div64.h>
#include <linux/seq_file.h>
#include <linux/namei.h>
#include "../include/lustre_intent.h"
#include "../include/obd_support.h"
#include "../include/lustre/lustre_idl.h"
#include "../include/lustre_lib.h"
#include "../include/lustre_net.h"
#include "../include/lustre_dlm.h"
#include "../include/lustre_mdc.h"
#include "../include/obd_class.h"
#include "../include/lprocfs_status.h"
#include "lmv_internal.h"
static int lmv_intent_remote(struct obd_export *exp, void *lmm,
int lmmsize, struct lookup_intent *it,
const struct lu_fid *parent_fid, int flags,
struct ptlrpc_request **reqp,
ldlm_blocking_callback cb_blocking,
__u64 extra_lock_flags)
{
struct obd_device *obd = exp->exp_obd;
struct lmv_obd *lmv = &obd->u.lmv;
struct ptlrpc_request *req = NULL;
struct lustre_handle plock;
struct md_op_data *op_data;
struct lmv_tgt_desc *tgt;
struct mdt_body *body;
int pmode;
int rc = 0;
body = req_capsule_server_get(&(*reqp)->rq_pill, &RMF_MDT_BODY);
if (!body)
return -EPROTO;
LASSERT((body->valid & OBD_MD_MDS));
/*
* Unfortunately, we have to lie to MDC/MDS to retrieve
* attributes llite needs and provideproper locking.
*/
if (it->it_op & IT_LOOKUP)
it->it_op = IT_GETATTR;
/*
* We got LOOKUP lock, but we really need attrs.
*/
pmode = it->it_lock_mode;
if (pmode) {
plock.cookie = it->it_lock_handle;
it->it_lock_mode = 0;
it->it_request = NULL;
}
LASSERT(fid_is_sane(&body->fid1));
tgt = lmv_find_target(lmv, &body->fid1);
if (IS_ERR(tgt)) {
rc = PTR_ERR(tgt);
goto out;
}
op_data = kzalloc(sizeof(*op_data), GFP_NOFS);
if (!op_data) {
rc = -ENOMEM;
goto out;
}
op_data->op_fid1 = body->fid1;
/* Sent the parent FID to the remote MDT */
if (parent_fid) {
/* The parent fid is only for remote open to
* check whether the open is from OBF,
* see mdt_cross_open
*/
LASSERT(it->it_op & IT_OPEN);
op_data->op_fid2 = *parent_fid;
/* Add object FID to op_fid3, in case it needs to check stale
* (M_CHECK_STALE), see mdc_finish_intent_lock
*/
op_data->op_fid3 = body->fid1;
}
op_data->op_bias = MDS_CROSS_REF;
CDEBUG(D_INODE, "REMOTE_INTENT with fid="DFID" -> mds #%d\n",
PFID(&body->fid1), tgt->ltd_idx);
rc = md_intent_lock(tgt->ltd_exp, op_data, lmm, lmmsize, it,
flags, &req, cb_blocking, extra_lock_flags);
if (rc)
goto out_free_op_data;
/*
* LLite needs LOOKUP lock to track dentry revocation in order to
* maintain dcache consistency. Thus drop UPDATE|PERM lock here
* and put LOOKUP in request.
*/
if (it->it_lock_mode != 0) {
it->it_remote_lock_handle =
it->it_lock_handle;
it->it_remote_lock_mode = it->it_lock_mode;
}
if (pmode) {
it->it_lock_handle = plock.cookie;
it->it_lock_mode = pmode;
}
out_free_op_data:
kfree(op_data);
out:
if (rc && pmode)
ldlm_lock_decref(&plock, pmode);
ptlrpc_req_finished(*reqp);
*reqp = req;
return rc;
}
int lmv_revalidate_slaves(struct obd_export *exp, struct mdt_body *mbody,
struct lmv_stripe_md *lsm,
ldlm_blocking_callback cb_blocking,
int extra_lock_flags)
{
struct obd_device *obd = exp->exp_obd;
struct lmv_obd *lmv = &obd->u.lmv;
struct mdt_body *body;
struct md_op_data *op_data;
unsigned long size = 0;
unsigned long nlink = 0;
__s64 atime = 0;
__s64 ctime = 0;
__s64 mtime = 0;
int rc = 0, i;
/**
* revalidate slaves has some problems, temporarily return,
* we may not need that
*/
if (lsm->lsm_md_stripe_count <= 1)
return 0;
op_data = kzalloc(sizeof(*op_data), GFP_NOFS);
if (!op_data)
return -ENOMEM;
/**
* Loop over the stripe information, check validity and update them
* from MDS if needed.
*/
for (i = 0; i < lsm->lsm_md_stripe_count; i++) {
struct lookup_intent it = { .it_op = IT_GETATTR };
struct ptlrpc_request *req = NULL;
struct lustre_handle *lockh = NULL;
struct lmv_tgt_desc *tgt = NULL;
struct inode *inode;
struct lu_fid fid;
fid = lsm->lsm_md_oinfo[i].lmo_fid;
inode = lsm->lsm_md_oinfo[i].lmo_root;
if (!i) {
if (mbody) {
body = mbody;
goto update;
} else {
goto release_lock;
}
}
/*
* Prepare op_data for revalidating. Note that @fid2 shluld be
* defined otherwise it will go to server and take new lock
* which is not needed here.
*/
memset(op_data, 0, sizeof(*op_data));
op_data->op_fid1 = fid;
op_data->op_fid2 = fid;
tgt = lmv_locate_mds(lmv, op_data, &fid);
if (IS_ERR(tgt)) {
rc = PTR_ERR(tgt);
goto cleanup;
}
CDEBUG(D_INODE, "Revalidate slave "DFID" -> mds #%d\n",
PFID(&fid), tgt->ltd_idx);
rc = md_intent_lock(tgt->ltd_exp, op_data, NULL, 0, &it, 0,
&req, cb_blocking, extra_lock_flags);
if (rc < 0)
goto cleanup;
lockh = (struct lustre_handle *)&it.it_lock_handle;
if (rc > 0 && !req) {
/* slave inode is still valid */
CDEBUG(D_INODE, "slave "DFID" is still valid.\n",
PFID(&fid));
rc = 0;
} else {
/* refresh slave from server */
body = req_capsule_server_get(&req->rq_pill,
&RMF_MDT_BODY);
LASSERT(body);
update:
if (unlikely(body->nlink < 2)) {
CERROR("%s: nlink %d < 2 corrupt stripe %d "DFID":" DFID"\n",
obd->obd_name, body->nlink, i,
PFID(&lsm->lsm_md_oinfo[i].lmo_fid),
PFID(&lsm->lsm_md_oinfo[0].lmo_fid));
if (req)
ptlrpc_req_finished(req);
if (it.it_lock_mode && lockh) {
ldlm_lock_decref(lockh, it.it_lock_mode);
it.it_lock_mode = 0;
}
rc = -EIO;
goto cleanup;
}
if (i)
md_set_lock_data(tgt->ltd_exp, &lockh->cookie,
inode, NULL);
i_size_write(inode, body->size);
set_nlink(inode, body->nlink);
LTIME_S(inode->i_atime) = body->atime;
LTIME_S(inode->i_ctime) = body->ctime;
LTIME_S(inode->i_mtime) = body->mtime;
if (req)
ptlrpc_req_finished(req);
}
release_lock:
size += i_size_read(inode);
if (i != 0)
nlink += inode->i_nlink - 2;
else
nlink += inode->i_nlink;
atime = LTIME_S(inode->i_atime) > atime ?
LTIME_S(inode->i_atime) : atime;
ctime = LTIME_S(inode->i_ctime) > ctime ?
LTIME_S(inode->i_ctime) : ctime;
mtime = LTIME_S(inode->i_mtime) > mtime ?
LTIME_S(inode->i_mtime) : mtime;
if (it.it_lock_mode && lockh) {
ldlm_lock_decref(lockh, it.it_lock_mode);
it.it_lock_mode = 0;
}
CDEBUG(D_INODE, "i %d "DFID" size %llu, nlink %u, atime %lu, mtime %lu, ctime %lu.\n",
i, PFID(&fid), i_size_read(inode), inode->i_nlink,
LTIME_S(inode->i_atime), LTIME_S(inode->i_mtime),
LTIME_S(inode->i_ctime));
}
/*
* update attr of master request.
*/
CDEBUG(D_INODE, "Return refreshed attrs: size = %lu nlink %lu atime %llu ctime %llu mtime %llu for " DFID"\n",
size, nlink, atime, ctime, mtime,
PFID(&lsm->lsm_md_oinfo[0].lmo_fid));
if (mbody) {
mbody->atime = atime;
mbody->ctime = ctime;
mbody->mtime = mtime;
}
cleanup:
kfree(op_data);
return rc;
}
/*
* IT_OPEN is intended to open (and create, possible) an object. Parent (pid)
* may be split dir.
*/
static int lmv_intent_open(struct obd_export *exp, struct md_op_data *op_data,
void *lmm, int lmmsize, struct lookup_intent *it,
int flags, struct ptlrpc_request **reqp,
ldlm_blocking_callback cb_blocking,
__u64 extra_lock_flags)
{
struct obd_device *obd = exp->exp_obd;
struct lmv_obd *lmv = &obd->u.lmv;
struct lmv_tgt_desc *tgt;
struct mdt_body *body;
int rc;
if (it->it_flags & MDS_OPEN_BY_FID && fid_is_sane(&op_data->op_fid2)) {
if (op_data->op_mea1) {
struct lmv_stripe_md *lsm = op_data->op_mea1;
const struct lmv_oinfo *oinfo;
oinfo = lsm_name_to_stripe_info(lsm, op_data->op_name,
op_data->op_namelen);
if (IS_ERR(oinfo))
return PTR_ERR(oinfo);
op_data->op_fid1 = oinfo->lmo_fid;
}
tgt = lmv_find_target(lmv, &op_data->op_fid2);
if (IS_ERR(tgt))
return PTR_ERR(tgt);
op_data->op_mds = tgt->ltd_idx;
} else {
tgt = lmv_locate_mds(lmv, op_data, &op_data->op_fid1);
if (IS_ERR(tgt))
return PTR_ERR(tgt);
}
/* If it is ready to open the file by FID, do not need
* allocate FID at all, otherwise it will confuse MDT
*/
if ((it->it_op & IT_CREAT) &&
!(it->it_flags & MDS_OPEN_BY_FID)) {
/*
* For open with IT_CREATE and for IT_CREATE cases allocate new
* fid and setup FLD for it.
*/
op_data->op_fid3 = op_data->op_fid2;
rc = lmv_fid_alloc(exp, &op_data->op_fid2, op_data);
if (rc != 0)
return rc;
}
CDEBUG(D_INODE, "OPEN_INTENT with fid1=" DFID ", fid2=" DFID ", name='%s' -> mds #%d\n",
PFID(&op_data->op_fid1),
PFID(&op_data->op_fid2), op_data->op_name, tgt->ltd_idx);
rc = md_intent_lock(tgt->ltd_exp, op_data, lmm, lmmsize, it, flags,
reqp, cb_blocking, extra_lock_flags);
if (rc != 0)
return rc;
/*
* Nothing is found, do not access body->fid1 as it is zero and thus
* pointless.
*/
if ((it->it_disposition & DISP_LOOKUP_NEG) &&
!(it->it_disposition & DISP_OPEN_CREATE) &&
!(it->it_disposition & DISP_OPEN_OPEN))
return rc;
body = req_capsule_server_get(&(*reqp)->rq_pill, &RMF_MDT_BODY);
if (!body)
return -EPROTO;
/* Not cross-ref case, just get out of here. */
if (unlikely((body->valid & OBD_MD_MDS))) {
rc = lmv_intent_remote(exp, lmm, lmmsize, it, &op_data->op_fid1,
flags, reqp, cb_blocking,
extra_lock_flags);
if (rc != 0)
return rc;
body = req_capsule_server_get(&(*reqp)->rq_pill, &RMF_MDT_BODY);
if (!body)
return -EPROTO;
}
return rc;
}
/*
* Handler for: getattr, lookup and revalidate cases.
*/
static int lmv_intent_lookup(struct obd_export *exp,
struct md_op_data *op_data,
void *lmm, int lmmsize, struct lookup_intent *it,
int flags, struct ptlrpc_request **reqp,
ldlm_blocking_callback cb_blocking,
__u64 extra_lock_flags)
{
struct lmv_stripe_md *lsm = op_data->op_mea1;
struct obd_device *obd = exp->exp_obd;
struct lmv_obd *lmv = &obd->u.lmv;
struct lmv_tgt_desc *tgt = NULL;
struct mdt_body *body;
int rc = 0;
tgt = lmv_locate_mds(lmv, op_data, &op_data->op_fid1);
if (IS_ERR(tgt))
return PTR_ERR(tgt);
if (!fid_is_sane(&op_data->op_fid2))
fid_zero(&op_data->op_fid2);
CDEBUG(D_INODE, "LOOKUP_INTENT with fid1="DFID", fid2="DFID", name='%s' -> mds #%d lsm=%p lsm_magic=%x\n",
PFID(&op_data->op_fid1), PFID(&op_data->op_fid2),
op_data->op_name ? op_data->op_name : "<NULL>",
tgt->ltd_idx, lsm, !lsm ? -1 : lsm->lsm_md_magic);
op_data->op_bias &= ~MDS_CROSS_REF;
rc = md_intent_lock(tgt->ltd_exp, op_data, lmm, lmmsize, it,
flags, reqp, cb_blocking, extra_lock_flags);
if (rc < 0)
return rc;
if (!*reqp) {
/*
* If RPC happens, lsm information will be revalidated
* during update_inode process (see ll_update_lsm_md)
*/
if (op_data->op_mea2) {
rc = lmv_revalidate_slaves(exp, NULL, op_data->op_mea2,
cb_blocking,
extra_lock_flags);
if (rc != 0)
return rc;
}
return rc;
} else if (it_disposition(it, DISP_LOOKUP_NEG) && lsm &&
lsm->lsm_md_magic == LMV_MAGIC_MIGRATE) {
/*
* For migrating directory, if it can not find the child in
* the source directory(master stripe), try the targeting
* directory(stripe 1)
*/
tgt = lmv_find_target(lmv, &lsm->lsm_md_oinfo[1].lmo_fid);
if (IS_ERR(tgt))
return PTR_ERR(tgt);
ptlrpc_req_finished(*reqp);
CDEBUG(D_INODE, "For migrating dir, try target dir "DFID"\n",
PFID(&lsm->lsm_md_oinfo[1].lmo_fid));
op_data->op_fid1 = lsm->lsm_md_oinfo[1].lmo_fid;
it->it_disposition &= ~DISP_ENQ_COMPLETE;
rc = md_intent_lock(tgt->ltd_exp, op_data, lmm, lmmsize, it,
flags, reqp, cb_blocking, extra_lock_flags);
return rc;
}
/*
* MDS has returned success. Probably name has been resolved in
* remote inode. Let's check this.
*/
body = req_capsule_server_get(&(*reqp)->rq_pill, &RMF_MDT_BODY);
if (!body)
return -EPROTO;
/* Not cross-ref case, just get out of here. */
if (unlikely((body->valid & OBD_MD_MDS))) {
rc = lmv_intent_remote(exp, lmm, lmmsize, it, NULL, flags,
reqp, cb_blocking, extra_lock_flags);
if (rc != 0)
return rc;
body = req_capsule_server_get(&(*reqp)->rq_pill, &RMF_MDT_BODY);
if (!body)
return -EPROTO;
}
return rc;
}
int lmv_intent_lock(struct obd_export *exp, struct md_op_data *op_data,
void *lmm, int lmmsize, struct lookup_intent *it,
int flags, struct ptlrpc_request **reqp,
ldlm_blocking_callback cb_blocking,
__u64 extra_lock_flags)
{
struct obd_device *obd = exp->exp_obd;
int rc;
LASSERT(fid_is_sane(&op_data->op_fid1));
CDEBUG(D_INODE, "INTENT LOCK '%s' for '%*s' on "DFID"\n",
LL_IT2STR(it), op_data->op_namelen, op_data->op_name,
PFID(&op_data->op_fid1));
rc = lmv_check_connect(obd);
if (rc)
return rc;
if (it->it_op & (IT_LOOKUP | IT_GETATTR | IT_LAYOUT))
rc = lmv_intent_lookup(exp, op_data, lmm, lmmsize, it,
flags, reqp, cb_blocking,
extra_lock_flags);
else if (it->it_op & IT_OPEN)
rc = lmv_intent_open(exp, op_data, lmm, lmmsize, it,
flags, reqp, cb_blocking,
extra_lock_flags);
else
LBUG();
return rc;
}
|