4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
16 * You should have received a copy of the GNU General Public License
17 * version 2 along with this program; If not, see
18 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
20 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
21 * CA 95054 USA or visit www.sun.com if you need additional information or
27 * Copyright (c) 2004, 2010, Oracle and/or its affiliates. All rights reserved.
28 * Use is subject to license terms.
30 * Copyright (c) 2011, 2012, Intel Corporation.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
37 #define DEBUG_SUBSYSTEM S_LMV
38 #include <linux/slab.h>
39 #include <linux/module.h>
40 #include <linux/pagemap.h>
41 #include <asm/div64.h>
42 #include <linux/seq_file.h>
43 #include <linux/namei.h>
44 #include <linux/lustre_intent.h>
46 #include <obd_support.h>
47 #include <lustre/lustre_idl.h>
48 #include <lustre_lib.h>
49 #include <lustre_net.h>
50 #include <lustre_dlm.h>
51 #include <obd_class.h>
52 #include <lprocfs_status.h>
53 #include "lmv_internal.h"
55 static int lmv_intent_remote(struct obd_export *exp, void *lmm,
56 int lmmsize, struct lookup_intent *it,
57 const struct lu_fid *parent_fid, int flags,
58 struct ptlrpc_request **reqp,
59 ldlm_blocking_callback cb_blocking,
60 __u64 extra_lock_flags)
62 struct obd_device *obd = exp->exp_obd;
63 struct lmv_obd *lmv = &obd->u.lmv;
64 struct ptlrpc_request *req = NULL;
65 struct lustre_handle plock;
66 struct md_op_data *op_data;
67 struct lmv_tgt_desc *tgt;
68 struct mdt_body *body;
72 body = req_capsule_server_get(&(*reqp)->rq_pill, &RMF_MDT_BODY);
76 LASSERT((body->valid & OBD_MD_MDS));
79 * Unfortunately, we have to lie to MDC/MDS to retrieve
80 * attributes llite needs and provideproper locking.
82 if (it->it_op & IT_LOOKUP)
83 it->it_op = IT_GETATTR;
86 * We got LOOKUP lock, but we really need attrs.
88 pmode = it->d.lustre.it_lock_mode;
90 plock.cookie = it->d.lustre.it_lock_handle;
91 it->d.lustre.it_lock_mode = 0;
92 it->d.lustre.it_data = NULL;
95 LASSERT(fid_is_sane(&body->fid1));
97 tgt = lmv_find_target(lmv, &body->fid1);
99 GOTO(out, rc = PTR_ERR(tgt));
101 OBD_ALLOC_PTR(op_data);
103 GOTO(out, rc = -ENOMEM);
105 op_data->op_fid1 = body->fid1;
106 /* Sent the parent FID to the remote MDT */
107 if (parent_fid != NULL) {
108 /* The parent fid is only for remote open to
109 * check whether the open is from OBF,
110 * see mdt_cross_open */
111 LASSERT(it->it_op & IT_OPEN);
112 op_data->op_fid2 = *parent_fid;
113 /* Add object FID to op_fid3, in case it needs to check stale
114 * (M_CHECK_STALE), see mdc_finish_intent_lock */
115 op_data->op_fid3 = body->fid1;
118 op_data->op_bias = MDS_CROSS_REF;
119 CDEBUG(D_INODE, "REMOTE_INTENT with fid="DFID" -> mds #%d\n",
120 PFID(&body->fid1), tgt->ltd_idx);
122 rc = md_intent_lock(tgt->ltd_exp, op_data, lmm, lmmsize, it,
123 flags, &req, cb_blocking, extra_lock_flags);
125 GOTO(out_free_op_data, rc);
128 * LLite needs LOOKUP lock to track dentry revocation in order to
129 * maintain dcache consistency. Thus drop UPDATE|PERM lock here
130 * and put LOOKUP in request.
132 if (it->d.lustre.it_lock_mode != 0) {
133 it->d.lustre.it_remote_lock_handle =
134 it->d.lustre.it_lock_handle;
135 it->d.lustre.it_remote_lock_mode = it->d.lustre.it_lock_mode;
138 it->d.lustre.it_lock_handle = plock.cookie;
139 it->d.lustre.it_lock_mode = pmode;
142 OBD_FREE_PTR(op_data);
145 ldlm_lock_decref(&plock, pmode);
147 ptlrpc_req_finished(*reqp);
153 * IT_OPEN is intended to open (and create, possible) an object. Parent (pid)
156 int lmv_intent_open(struct obd_export *exp, struct md_op_data *op_data,
157 void *lmm, int lmmsize, struct lookup_intent *it,
158 int flags, struct ptlrpc_request **reqp,
159 ldlm_blocking_callback cb_blocking,
160 __u64 extra_lock_flags)
162 struct obd_device *obd = exp->exp_obd;
163 struct lmv_obd *lmv = &obd->u.lmv;
164 struct lmv_tgt_desc *tgt;
165 struct mdt_body *body;
168 tgt = lmv_locate_mds(lmv, op_data, &op_data->op_fid1);
172 /* If it is ready to open the file by FID, do not need
173 * allocate FID at all, otherwise it will confuse MDT */
174 if ((it->it_op & IT_CREAT) &&
175 !(it->it_flags & MDS_OPEN_BY_FID)) {
177 * For open with IT_CREATE and for IT_CREATE cases allocate new
178 * fid and setup FLD for it.
180 op_data->op_fid3 = op_data->op_fid2;
181 rc = lmv_fid_alloc(exp, &op_data->op_fid2, op_data);
186 CDEBUG(D_INODE, "OPEN_INTENT with fid1="DFID", fid2="DFID","
187 " name='%s' -> mds #%d\n", PFID(&op_data->op_fid1),
188 PFID(&op_data->op_fid2), op_data->op_name, tgt->ltd_idx);
190 rc = md_intent_lock(tgt->ltd_exp, op_data, lmm, lmmsize, it, flags,
191 reqp, cb_blocking, extra_lock_flags);
195 * Nothing is found, do not access body->fid1 as it is zero and thus
198 if ((it->d.lustre.it_disposition & DISP_LOOKUP_NEG) &&
199 !(it->d.lustre.it_disposition & DISP_OPEN_CREATE) &&
200 !(it->d.lustre.it_disposition & DISP_OPEN_OPEN))
203 body = req_capsule_server_get(&(*reqp)->rq_pill, &RMF_MDT_BODY);
207 * Not cross-ref case, just get out of here.
209 if (likely(!(body->valid & OBD_MD_MDS)))
213 * Okay, MDS has returned success. Probably name has been resolved in
216 rc = lmv_intent_remote(exp, lmm, lmmsize, it, &op_data->op_fid1, flags,
217 reqp, cb_blocking, extra_lock_flags);
221 * This is possible, that some userspace application will try to
222 * open file as directory and we will have -ENOTDIR here. As
223 * this is normal situation, we should not print error here,
226 CDEBUG(D_INODE, "Can't handle remote %s: dir "DFID"("DFID"):"
227 "%*s: %d\n", LL_IT2STR(it), PFID(&op_data->op_fid2),
228 PFID(&op_data->op_fid1), op_data->op_namelen,
229 op_data->op_name, rc);
237 * Handler for: getattr, lookup and revalidate cases.
239 int lmv_intent_lookup(struct obd_export *exp, struct md_op_data *op_data,
240 void *lmm, int lmmsize, struct lookup_intent *it,
241 int flags, struct ptlrpc_request **reqp,
242 ldlm_blocking_callback cb_blocking,
243 __u64 extra_lock_flags)
245 struct obd_device *obd = exp->exp_obd;
246 struct lmv_obd *lmv = &obd->u.lmv;
247 struct lmv_tgt_desc *tgt = NULL;
248 struct mdt_body *body;
251 tgt = lmv_locate_mds(lmv, op_data, &op_data->op_fid1);
255 if (!fid_is_sane(&op_data->op_fid2))
256 fid_zero(&op_data->op_fid2);
258 CDEBUG(D_INODE, "LOOKUP_INTENT with fid1="DFID", fid2="DFID
259 ", name='%s' -> mds #%d\n", PFID(&op_data->op_fid1),
260 PFID(&op_data->op_fid2),
261 op_data->op_name ? op_data->op_name : "<NULL>",
264 op_data->op_bias &= ~MDS_CROSS_REF;
266 rc = md_intent_lock(tgt->ltd_exp, op_data, lmm, lmmsize, it,
267 flags, reqp, cb_blocking, extra_lock_flags);
269 if (rc < 0 || *reqp == NULL)
273 * MDS has returned success. Probably name has been resolved in
274 * remote inode. Let's check this.
276 body = req_capsule_server_get(&(*reqp)->rq_pill, &RMF_MDT_BODY);
279 /* Not cross-ref case, just get out of here. */
280 if (likely(!(body->valid & OBD_MD_MDS)))
283 rc = lmv_intent_remote(exp, lmm, lmmsize, it, NULL, flags, reqp,
284 cb_blocking, extra_lock_flags);
289 int lmv_intent_lock(struct obd_export *exp, struct md_op_data *op_data,
290 void *lmm, int lmmsize, struct lookup_intent *it,
291 int flags, struct ptlrpc_request **reqp,
292 ldlm_blocking_callback cb_blocking,
293 __u64 extra_lock_flags)
295 struct obd_device *obd = exp->exp_obd;
299 LASSERT(fid_is_sane(&op_data->op_fid1));
301 CDEBUG(D_INODE, "INTENT LOCK '%s' for '%*s' on "DFID"\n",
302 LL_IT2STR(it), op_data->op_namelen, op_data->op_name,
303 PFID(&op_data->op_fid1));
305 rc = lmv_check_connect(obd);
309 if (it->it_op & (IT_LOOKUP | IT_GETATTR | IT_LAYOUT))
310 rc = lmv_intent_lookup(exp, op_data, lmm, lmmsize, it,
311 flags, reqp, cb_blocking,
313 else if (it->it_op & IT_OPEN)
314 rc = lmv_intent_open(exp, op_data, lmm, lmmsize, it,
315 flags, reqp, cb_blocking,