diff options
Diffstat (limited to 'drivers/staging/lustre/lustre/lmv/lmv_intent.c')
| -rw-r--r-- | drivers/staging/lustre/lustre/lmv/lmv_intent.c | 328 |
1 files changed, 328 insertions, 0 deletions
diff --git a/drivers/staging/lustre/lustre/lmv/lmv_intent.c b/drivers/staging/lustre/lustre/lmv/lmv_intent.c new file mode 100644 index 000000000000..7eefab5ef5d0 --- /dev/null +++ b/drivers/staging/lustre/lustre/lmv/lmv_intent.c @@ -0,0 +1,328 @@ +/* + * 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.sun.com/software/products/lustre/docs/GPLv2.pdf + * + * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, + * CA 95054 USA or visit www.sun.com if you need additional information or + * have any questions. + * + * GPL HEADER END + */ +/* + * Copyright (c) 2004, 2010, Oracle and/or its affiliates. All rights reserved. + * Use is subject to license terms. + * + * Copyright (c) 2011, 2012, 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/init.h> +#include <linux/slab.h> +#include <linux/pagemap.h> +#include <asm/div64.h> +#include <linux/seq_file.h> +#include <linux/namei.h> +#include <linux/lustre_intent.h> + +#include <obd_support.h> +#include <lustre/lustre_idl.h> +#include <lustre_lib.h> +#include <lustre_net.h> +#include <lustre_dlm.h> +#include <obd_class.h> +#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; + ENTRY; + + body = req_capsule_server_get(&(*reqp)->rq_pill, &RMF_MDT_BODY); + if (body == NULL) + 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->d.lustre.it_lock_mode; + if (pmode) { + plock.cookie = it->d.lustre.it_lock_handle; + it->d.lustre.it_lock_mode = 0; + it->d.lustre.it_data = NULL; + } + + LASSERT(fid_is_sane(&body->fid1)); + + tgt = lmv_find_target(lmv, &body->fid1); + if (IS_ERR(tgt)) + GOTO(out, rc = PTR_ERR(tgt)); + + OBD_ALLOC_PTR(op_data); + if (op_data == NULL) + GOTO(out, rc = -ENOMEM); + + op_data->op_fid1 = body->fid1; + /* Sent the parent FID to the remote MDT */ + if (parent_fid != NULL) { + /* 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); + + it->d.lustre.it_disposition &= ~DISP_ENQ_COMPLETE; + 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, rc); + + /* + * 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->d.lustre.it_lock_mode != 0) { + it->d.lustre.it_remote_lock_handle = + it->d.lustre.it_lock_handle; + it->d.lustre.it_remote_lock_mode = it->d.lustre.it_lock_mode; + } + + it->d.lustre.it_lock_handle = plock.cookie; + it->d.lustre.it_lock_mode = pmode; + + EXIT; +out_free_op_data: + OBD_FREE_PTR(op_data); +out: + if (rc && pmode) + ldlm_lock_decref(&plock, pmode); + + ptlrpc_req_finished(*reqp); + *reqp = req; + return rc; +} + +/* + * IT_OPEN is intended to open (and create, possible) an object. Parent (pid) + * may be split dir. + */ +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; + ENTRY; + + 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->d.lustre.it_disposition & DISP_LOOKUP_NEG) && + !(it->d.lustre.it_disposition & DISP_OPEN_CREATE) && + !(it->d.lustre.it_disposition & DISP_OPEN_OPEN)) + RETURN(rc); + + body = req_capsule_server_get(&(*reqp)->rq_pill, &RMF_MDT_BODY); + if (body == NULL) + RETURN(-EPROTO); + /* + * Not cross-ref case, just get out of here. + */ + if (likely(!(body->valid & OBD_MD_MDS))) + RETURN(0); + + /* + * Okay, MDS has returned success. Probably name has been resolved in + * remote inode. + */ + rc = lmv_intent_remote(exp, lmm, lmmsize, it, &op_data->op_fid1, flags, + reqp, cb_blocking, extra_lock_flags); + if (rc != 0) { + LASSERT(rc < 0); + /* + * This is possible, that some userspace application will try to + * open file as directory and we will have -ENOTDIR here. As + * this is normal situation, we should not print error here, + * only debug info. + */ + CDEBUG(D_INODE, "Can't handle remote %s: dir "DFID"("DFID"):" + "%*s: %d\n", LL_IT2STR(it), PFID(&op_data->op_fid2), + PFID(&op_data->op_fid1), op_data->op_namelen, + op_data->op_name, rc); + RETURN(rc); + } + + RETURN(rc); +} + +/* + * Handler for: getattr, lookup and revalidate cases. + */ +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 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; + ENTRY; + + 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\n", PFID(&op_data->op_fid1), + PFID(&op_data->op_fid2), + op_data->op_name ? op_data->op_name : "<NULL>", + tgt->ltd_idx); + + 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 || *reqp == NULL) + 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 == NULL) + RETURN(-EPROTO); + /* Not cross-ref case, just get out of here. */ + if (likely(!(body->valid & OBD_MD_MDS))) + RETURN(0); + + rc = lmv_intent_remote(exp, lmm, lmmsize, it, NULL, flags, reqp, + cb_blocking, extra_lock_flags); + + 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; + ENTRY; + + LASSERT(it != NULL); + 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); +} |