1 /*
2 * GPL HEADER START
3 *
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
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.
9 *
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).
15 *
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
19 *
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
22 * have any questions.
23 *
24 * GPL HEADER END
25 */
26 /*
27 * Copyright (c) 2004, 2010, Oracle and/or its affiliates. All rights reserved.
28 * Use is subject to license terms.
29 *
30 * Copyright (c) 2011, 2012, Intel Corporation.
31 */
32 /*
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
35 */
36
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 "../include/lustre_intent.h"
45 #include "../include/obd_support.h"
46 #include "../include/lustre/lustre_idl.h"
47 #include "../include/lustre_lib.h"
48 #include "../include/lustre_net.h"
49 #include "../include/lustre_dlm.h"
50 #include "../include/obd_class.h"
51 #include "../include/lprocfs_status.h"
52 #include "lmv_internal.h"
53
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)54 static int lmv_intent_remote(struct obd_export *exp, void *lmm,
55 int lmmsize, struct lookup_intent *it,
56 const struct lu_fid *parent_fid, int flags,
57 struct ptlrpc_request **reqp,
58 ldlm_blocking_callback cb_blocking,
59 __u64 extra_lock_flags)
60 {
61 struct obd_device *obd = exp->exp_obd;
62 struct lmv_obd *lmv = &obd->u.lmv;
63 struct ptlrpc_request *req = NULL;
64 struct lustre_handle plock;
65 struct md_op_data *op_data;
66 struct lmv_tgt_desc *tgt;
67 struct mdt_body *body;
68 int pmode;
69 int rc = 0;
70
71 body = req_capsule_server_get(&(*reqp)->rq_pill, &RMF_MDT_BODY);
72 if (body == NULL)
73 return -EPROTO;
74
75 LASSERT((body->valid & OBD_MD_MDS));
76
77 /*
78 * Unfortunately, we have to lie to MDC/MDS to retrieve
79 * attributes llite needs and provideproper locking.
80 */
81 if (it->it_op & IT_LOOKUP)
82 it->it_op = IT_GETATTR;
83
84 /*
85 * We got LOOKUP lock, but we really need attrs.
86 */
87 pmode = it->d.lustre.it_lock_mode;
88 if (pmode) {
89 plock.cookie = it->d.lustre.it_lock_handle;
90 it->d.lustre.it_lock_mode = 0;
91 it->d.lustre.it_data = NULL;
92 }
93
94 LASSERT(fid_is_sane(&body->fid1));
95
96 tgt = lmv_find_target(lmv, &body->fid1);
97 if (IS_ERR(tgt)) {
98 rc = PTR_ERR(tgt);
99 goto out;
100 }
101
102 op_data = kzalloc(sizeof(*op_data), GFP_NOFS);
103 if (!op_data) {
104 rc = -ENOMEM;
105 goto out;
106 }
107
108 op_data->op_fid1 = body->fid1;
109 /* Sent the parent FID to the remote MDT */
110 if (parent_fid != NULL) {
111 /* The parent fid is only for remote open to
112 * check whether the open is from OBF,
113 * see mdt_cross_open */
114 LASSERT(it->it_op & IT_OPEN);
115 op_data->op_fid2 = *parent_fid;
116 /* Add object FID to op_fid3, in case it needs to check stale
117 * (M_CHECK_STALE), see mdc_finish_intent_lock */
118 op_data->op_fid3 = body->fid1;
119 }
120
121 op_data->op_bias = MDS_CROSS_REF;
122 CDEBUG(D_INODE, "REMOTE_INTENT with fid="DFID" -> mds #%d\n",
123 PFID(&body->fid1), tgt->ltd_idx);
124
125 rc = md_intent_lock(tgt->ltd_exp, op_data, lmm, lmmsize, it,
126 flags, &req, cb_blocking, extra_lock_flags);
127 if (rc)
128 goto out_free_op_data;
129
130 /*
131 * LLite needs LOOKUP lock to track dentry revocation in order to
132 * maintain dcache consistency. Thus drop UPDATE|PERM lock here
133 * and put LOOKUP in request.
134 */
135 if (it->d.lustre.it_lock_mode != 0) {
136 it->d.lustre.it_remote_lock_handle =
137 it->d.lustre.it_lock_handle;
138 it->d.lustre.it_remote_lock_mode = it->d.lustre.it_lock_mode;
139 }
140
141 it->d.lustre.it_lock_handle = plock.cookie;
142 it->d.lustre.it_lock_mode = pmode;
143
144 out_free_op_data:
145 kfree(op_data);
146 out:
147 if (rc && pmode)
148 ldlm_lock_decref(&plock, pmode);
149
150 ptlrpc_req_finished(*reqp);
151 *reqp = req;
152 return rc;
153 }
154
155 /*
156 * IT_OPEN is intended to open (and create, possible) an object. Parent (pid)
157 * may be split dir.
158 */
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)159 int lmv_intent_open(struct obd_export *exp, struct md_op_data *op_data,
160 void *lmm, int lmmsize, struct lookup_intent *it,
161 int flags, struct ptlrpc_request **reqp,
162 ldlm_blocking_callback cb_blocking,
163 __u64 extra_lock_flags)
164 {
165 struct obd_device *obd = exp->exp_obd;
166 struct lmv_obd *lmv = &obd->u.lmv;
167 struct lmv_tgt_desc *tgt;
168 struct mdt_body *body;
169 int rc;
170
171 tgt = lmv_locate_mds(lmv, op_data, &op_data->op_fid1);
172 if (IS_ERR(tgt))
173 return PTR_ERR(tgt);
174
175 /* If it is ready to open the file by FID, do not need
176 * allocate FID at all, otherwise it will confuse MDT */
177 if ((it->it_op & IT_CREAT) &&
178 !(it->it_flags & MDS_OPEN_BY_FID)) {
179 /*
180 * For open with IT_CREATE and for IT_CREATE cases allocate new
181 * fid and setup FLD for it.
182 */
183 op_data->op_fid3 = op_data->op_fid2;
184 rc = lmv_fid_alloc(exp, &op_data->op_fid2, op_data);
185 if (rc != 0)
186 return rc;
187 }
188
189 CDEBUG(D_INODE, "OPEN_INTENT with fid1=" DFID ", fid2=" DFID ", name='%s' -> mds #%d\n",
190 PFID(&op_data->op_fid1),
191 PFID(&op_data->op_fid2), op_data->op_name, tgt->ltd_idx);
192
193 rc = md_intent_lock(tgt->ltd_exp, op_data, lmm, lmmsize, it, flags,
194 reqp, cb_blocking, extra_lock_flags);
195 if (rc != 0)
196 return rc;
197 /*
198 * Nothing is found, do not access body->fid1 as it is zero and thus
199 * pointless.
200 */
201 if ((it->d.lustre.it_disposition & DISP_LOOKUP_NEG) &&
202 !(it->d.lustre.it_disposition & DISP_OPEN_CREATE) &&
203 !(it->d.lustre.it_disposition & DISP_OPEN_OPEN))
204 return rc;
205
206 body = req_capsule_server_get(&(*reqp)->rq_pill, &RMF_MDT_BODY);
207 if (body == NULL)
208 return -EPROTO;
209 /*
210 * Not cross-ref case, just get out of here.
211 */
212 if (likely(!(body->valid & OBD_MD_MDS)))
213 return 0;
214
215 /*
216 * Okay, MDS has returned success. Probably name has been resolved in
217 * remote inode.
218 */
219 rc = lmv_intent_remote(exp, lmm, lmmsize, it, &op_data->op_fid1, flags,
220 reqp, cb_blocking, extra_lock_flags);
221 if (rc != 0) {
222 LASSERT(rc < 0);
223 /*
224 * This is possible, that some userspace application will try to
225 * open file as directory and we will have -ENOTDIR here. As
226 * this is normal situation, we should not print error here,
227 * only debug info.
228 */
229 CDEBUG(D_INODE, "Can't handle remote %s: dir " DFID "(" DFID "):%*s: %d\n",
230 LL_IT2STR(it), PFID(&op_data->op_fid2),
231 PFID(&op_data->op_fid1), op_data->op_namelen,
232 op_data->op_name, rc);
233 return rc;
234 }
235
236 return rc;
237 }
238
239 /*
240 * Handler for: getattr, lookup and revalidate cases.
241 */
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)242 int lmv_intent_lookup(struct obd_export *exp, struct md_op_data *op_data,
243 void *lmm, int lmmsize, struct lookup_intent *it,
244 int flags, struct ptlrpc_request **reqp,
245 ldlm_blocking_callback cb_blocking,
246 __u64 extra_lock_flags)
247 {
248 struct obd_device *obd = exp->exp_obd;
249 struct lmv_obd *lmv = &obd->u.lmv;
250 struct lmv_tgt_desc *tgt = NULL;
251 struct mdt_body *body;
252 int rc = 0;
253
254 tgt = lmv_locate_mds(lmv, op_data, &op_data->op_fid1);
255 if (IS_ERR(tgt))
256 return PTR_ERR(tgt);
257
258 if (!fid_is_sane(&op_data->op_fid2))
259 fid_zero(&op_data->op_fid2);
260
261 CDEBUG(D_INODE, "LOOKUP_INTENT with fid1="DFID", fid2="DFID
262 ", name='%s' -> mds #%d\n", PFID(&op_data->op_fid1),
263 PFID(&op_data->op_fid2),
264 op_data->op_name ? op_data->op_name : "<NULL>",
265 tgt->ltd_idx);
266
267 op_data->op_bias &= ~MDS_CROSS_REF;
268
269 rc = md_intent_lock(tgt->ltd_exp, op_data, lmm, lmmsize, it,
270 flags, reqp, cb_blocking, extra_lock_flags);
271
272 if (rc < 0 || *reqp == NULL)
273 return rc;
274
275 /*
276 * MDS has returned success. Probably name has been resolved in
277 * remote inode. Let's check this.
278 */
279 body = req_capsule_server_get(&(*reqp)->rq_pill, &RMF_MDT_BODY);
280 if (body == NULL)
281 return -EPROTO;
282 /* Not cross-ref case, just get out of here. */
283 if (likely(!(body->valid & OBD_MD_MDS)))
284 return 0;
285
286 rc = lmv_intent_remote(exp, lmm, lmmsize, it, NULL, flags, reqp,
287 cb_blocking, extra_lock_flags);
288
289 return rc;
290 }
291
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)292 int lmv_intent_lock(struct obd_export *exp, struct md_op_data *op_data,
293 void *lmm, int lmmsize, struct lookup_intent *it,
294 int flags, struct ptlrpc_request **reqp,
295 ldlm_blocking_callback cb_blocking,
296 __u64 extra_lock_flags)
297 {
298 struct obd_device *obd = exp->exp_obd;
299 int rc;
300
301 LASSERT(it != NULL);
302 LASSERT(fid_is_sane(&op_data->op_fid1));
303
304 CDEBUG(D_INODE, "INTENT LOCK '%s' for '%*s' on "DFID"\n",
305 LL_IT2STR(it), op_data->op_namelen, op_data->op_name,
306 PFID(&op_data->op_fid1));
307
308 rc = lmv_check_connect(obd);
309 if (rc)
310 return rc;
311
312 if (it->it_op & (IT_LOOKUP | IT_GETATTR | IT_LAYOUT))
313 rc = lmv_intent_lookup(exp, op_data, lmm, lmmsize, it,
314 flags, reqp, cb_blocking,
315 extra_lock_flags);
316 else if (it->it_op & IT_OPEN)
317 rc = lmv_intent_open(exp, op_data, lmm, lmmsize, it,
318 flags, reqp, cb_blocking,
319 extra_lock_flags);
320 else
321 LBUG();
322 return rc;
323 }
324