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, 2013, 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
39 #include <linux/slab.h>
40 #include <linux/module.h>
41 #include <linux/init.h>
42 #include <linux/slab.h>
43 #include <linux/pagemap.h>
44 #include <asm/div64.h>
45 #include <linux/seq_file.h>
46 #include <linux/namei.h>
47 #include <linux/lustre_intent.h>
49 #include <liblustre.h>
52 #include <obd_support.h>
53 #include <lustre/lustre_idl.h>
54 #include <lustre_lib.h>
55 #include <lustre_net.h>
56 #include <lustre_dlm.h>
57 #include <obd_class.h>
58 #include <lprocfs_status.h>
59 #include "lmv_internal.h"
61 static int lmv_intent_remote(struct obd_export *exp, void *lmm,
62 int lmmsize, struct lookup_intent *it,
63 const struct lu_fid *parent_fid, int flags,
64 struct ptlrpc_request **reqp,
65 ldlm_blocking_callback cb_blocking,
66 __u64 extra_lock_flags)
68 struct obd_device *obd = exp->exp_obd;
69 struct lmv_obd *lmv = &obd->u.lmv;
70 struct ptlrpc_request *req = NULL;
71 struct lustre_handle plock;
72 struct md_op_data *op_data;
73 struct lmv_tgt_desc *tgt;
74 struct mdt_body *body;
79 body = req_capsule_server_get(&(*reqp)->rq_pill, &RMF_MDT_BODY);
83 LASSERT((body->valid & OBD_MD_MDS));
86 * Unfortunately, we have to lie to MDC/MDS to retrieve
87 * attributes llite needs and provideproper locking.
89 if (it->it_op & IT_LOOKUP)
90 it->it_op = IT_GETATTR;
93 * We got LOOKUP lock, but we really need attrs.
95 pmode = it->d.lustre.it_lock_mode;
97 plock.cookie = it->d.lustre.it_lock_handle;
98 it->d.lustre.it_lock_mode = 0;
99 it->d.lustre.it_data = NULL;
102 LASSERT(fid_is_sane(&body->fid1));
104 tgt = lmv_find_target(lmv, &body->fid1);
106 GOTO(out, rc = PTR_ERR(tgt));
108 OBD_ALLOC_PTR(op_data);
110 GOTO(out, rc = -ENOMEM);
112 op_data->op_fid1 = body->fid1;
113 /* Sent the parent FID to the remote MDT */
114 if (parent_fid != NULL) {
115 /* The parent fid is only for remote open to
116 * check whether the open is from OBF,
117 * see mdt_cross_open */
118 LASSERT(it->it_op & IT_OPEN);
119 op_data->op_fid2 = *parent_fid;
120 /* Add object FID to op_fid3, in case it needs to check stale
121 * (M_CHECK_STALE), see mdc_finish_intent_lock */
122 op_data->op_fid3 = body->fid1;
125 op_data->op_bias = MDS_CROSS_REF;
126 CDEBUG(D_INODE, "REMOTE_INTENT with fid="DFID" -> mds #%d\n",
127 PFID(&body->fid1), tgt->ltd_idx);
129 rc = md_intent_lock(tgt->ltd_exp, op_data, lmm, lmmsize, it,
130 flags, &req, cb_blocking, extra_lock_flags);
132 GOTO(out_free_op_data, rc);
135 * LLite needs LOOKUP lock to track dentry revocation in order to
136 * maintain dcache consistency. Thus drop UPDATE|PERM lock here
137 * and put LOOKUP in request.
139 if (it->d.lustre.it_lock_mode != 0) {
140 it->d.lustre.it_remote_lock_handle =
141 it->d.lustre.it_lock_handle;
142 it->d.lustre.it_remote_lock_mode = it->d.lustre.it_lock_mode;
145 it->d.lustre.it_lock_handle = plock.cookie;
146 it->d.lustre.it_lock_mode = pmode;
150 OBD_FREE_PTR(op_data);
153 ldlm_lock_decref(&plock, pmode);
155 ptlrpc_req_finished(*reqp);
161 * IT_OPEN is intended to open (and create, possible) an object. Parent (pid)
164 int lmv_intent_open(struct obd_export *exp, struct md_op_data *op_data,
165 void *lmm, int lmmsize, struct lookup_intent *it,
166 int flags, struct ptlrpc_request **reqp,
167 ldlm_blocking_callback cb_blocking,
168 __u64 extra_lock_flags)
170 struct obd_device *obd = exp->exp_obd;
171 struct lmv_obd *lmv = &obd->u.lmv;
172 struct lmv_tgt_desc *tgt;
173 struct mdt_body *body;
177 /* Note: client might open with some random flags(sanity 33b), so we can
178 * not make sure op_fid2 is being initialized with BY_FID flag */
179 if (it->it_flags & MDS_OPEN_BY_FID && fid_is_sane(&op_data->op_fid2))
180 tgt = lmv_locate_mds(lmv, op_data, &op_data->op_fid2);
182 tgt = lmv_locate_mds(lmv, op_data, &op_data->op_fid1);
185 RETURN(PTR_ERR(tgt));
187 /* If it is ready to open the file by FID, do not need
188 * allocate FID at all, otherwise it will confuse MDT */
189 if ((it->it_op & IT_CREAT) &&
190 !(it->it_flags & MDS_OPEN_BY_FID)) {
192 * For open with IT_CREATE and for IT_CREATE cases allocate new
193 * fid and setup FLD for it.
195 op_data->op_fid3 = op_data->op_fid2;
196 rc = lmv_fid_alloc(exp, &op_data->op_fid2, op_data);
201 CDEBUG(D_INODE, "OPEN_INTENT with fid1="DFID", fid2="DFID","
202 " name='%s' -> mds #%d\n", PFID(&op_data->op_fid1),
203 PFID(&op_data->op_fid2), op_data->op_name, tgt->ltd_idx);
205 rc = md_intent_lock(tgt->ltd_exp, op_data, lmm, lmmsize, it, flags,
206 reqp, cb_blocking, extra_lock_flags);
210 * Nothing is found, do not access body->fid1 as it is zero and thus
213 if ((it->d.lustre.it_disposition & DISP_LOOKUP_NEG) &&
214 !(it->d.lustre.it_disposition & DISP_OPEN_CREATE) &&
215 !(it->d.lustre.it_disposition & DISP_OPEN_OPEN))
218 body = req_capsule_server_get(&(*reqp)->rq_pill, &RMF_MDT_BODY);
222 * Not cross-ref case, just get out of here.
224 if (likely(!(body->valid & OBD_MD_MDS)))
228 * Okay, MDS has returned success. Probably name has been resolved in
231 rc = lmv_intent_remote(exp, lmm, lmmsize, it, &op_data->op_fid1, flags,
232 reqp, cb_blocking, extra_lock_flags);
236 * This is possible, that some userspace application will try to
237 * open file as directory and we will have -ENOTDIR here. As
238 * this is normal situation, we should not print error here,
241 CDEBUG(D_INODE, "Can't handle remote %s: dir "DFID"("DFID"):"
242 "%*s: %d\n", LL_IT2STR(it), PFID(&op_data->op_fid2),
243 PFID(&op_data->op_fid1), op_data->op_namelen,
244 op_data->op_name, rc);
252 * Handler for: getattr, lookup and revalidate cases.
254 int lmv_intent_lookup(struct obd_export *exp, struct md_op_data *op_data,
255 void *lmm, int lmmsize, struct lookup_intent *it,
256 int flags, struct ptlrpc_request **reqp,
257 ldlm_blocking_callback cb_blocking,
258 __u64 extra_lock_flags)
260 struct obd_device *obd = exp->exp_obd;
261 struct lmv_obd *lmv = &obd->u.lmv;
262 struct lmv_tgt_desc *tgt = NULL;
263 struct mdt_body *body;
267 tgt = lmv_locate_mds(lmv, op_data, &op_data->op_fid1);
269 RETURN(PTR_ERR(tgt));
271 if (!fid_is_sane(&op_data->op_fid2))
272 fid_zero(&op_data->op_fid2);
274 CDEBUG(D_INODE, "LOOKUP_INTENT with fid1="DFID", fid2="DFID
275 ", name='%s' -> mds #%d\n", PFID(&op_data->op_fid1),
276 PFID(&op_data->op_fid2),
277 op_data->op_name ? op_data->op_name : "<NULL>",
280 op_data->op_bias &= ~MDS_CROSS_REF;
282 rc = md_intent_lock(tgt->ltd_exp, op_data, lmm, lmmsize, it,
283 flags, reqp, cb_blocking, extra_lock_flags);
285 if (rc < 0 || *reqp == NULL)
289 * MDS has returned success. Probably name has been resolved in
290 * remote inode. Let's check this.
292 body = req_capsule_server_get(&(*reqp)->rq_pill, &RMF_MDT_BODY);
295 /* Not cross-ref case, just get out of here. */
296 if (likely(!(body->valid & OBD_MD_MDS)))
299 rc = lmv_intent_remote(exp, lmm, lmmsize, it, NULL, flags, reqp,
300 cb_blocking, extra_lock_flags);
305 int lmv_intent_lock(struct obd_export *exp, struct md_op_data *op_data,
306 void *lmm, int lmmsize, struct lookup_intent *it,
307 int flags, struct ptlrpc_request **reqp,
308 ldlm_blocking_callback cb_blocking,
309 __u64 extra_lock_flags)
311 struct obd_device *obd = exp->exp_obd;
316 LASSERT(fid_is_sane(&op_data->op_fid1));
318 CDEBUG(D_INODE, "INTENT LOCK '%s' for '%*s' on "DFID"\n",
319 LL_IT2STR(it), op_data->op_namelen, op_data->op_name,
320 PFID(&op_data->op_fid1));
322 rc = lmv_check_connect(obd);
326 if (it->it_op & (IT_LOOKUP | IT_GETATTR | IT_LAYOUT))
327 rc = lmv_intent_lookup(exp, op_data, lmm, lmmsize, it,
328 flags, reqp, cb_blocking,
330 else if (it->it_op & IT_OPEN)
331 rc = lmv_intent_open(exp, op_data, lmm, lmmsize, it,
332 flags, reqp, cb_blocking,