lustre/mds/mds_audit_path.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  *
   5  *  Copyright (C) 2001-2003 Cluster File Systems, Inc.
   6  *
   7  *   This file is part of Lustre, http://www.lustre.org.
   8  *
   9  *   Lustre is free software; you can redistribute it and/or
  10  *   modify it under the terms of version 2 of the GNU General Public
  11  *   License as published by the Free Software Foundation.
  12  *
  13  *   Lustre is distributed in the hope that it will be useful,
  14  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *   GNU General Public License for more details.
  17  *
  18  *   You should have received a copy of the GNU General Public License
  19  *   along with Lustre; if not, write to the Free Software
  20  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21  */
  22
  23 #ifndef EXPORT_SYMTAB
  24 # define EXPORT_SYMTAB
  25 #endif
  26 #define DEBUG_SUBSYSTEM S_MDS
  27
  28 #include <linux/module.h>
  29 #include <linux/lustre_mds.h>
  30 #include <linux/lustre_dlm.h>
  31 #include <linux/lustre_fsfilt.h>
  32 #include <linux/init.h>
  33 #include <linux/obd_class.h>
  34 #include <linux/fs.h>
  35 #include <linux/namei.h>
  36 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0))
  37 # include <linux/smp_lock.h>
  38 # include <linux/buffer_head.h>
  39 # include <linux/workqueue.h>
  40 # include <linux/mount.h>
  41 #else
  42 # include <linux/locks.h>
  43 #endif
  44 #include <linux/lustre_audit.h>
  45 #include "mds_internal.h"
  46
  47
  48 #define PP_FILE         1
  49 #define PP_DIR          2
  50 #define PP_SPLIT_MASTER 3
  51 #define PP_SPLIT_SLAVE  4
  52 #define PP_CROSS_DIR    5
  53 #define PP_AUDIT_LOG    6       /* search id in audit log */
  54
  55 struct scan_dir_data {
  56         int               rc;
  57         struct lustre_id *id;
  58         char             *name;
  59 };
  60
  61 static int filldir(void *__buf, const char *name, int namlen,
  62                    loff_t offset, ino_t ino, unsigned int d_type)
  63 {
  64         struct scan_dir_data *sd = __buf;
  65         ENTRY;
  66
  67         if (name[0] == '.' &&
  68             (namlen == 1 || (namlen == 2 && name[1] == '.'))) {
  69                 /* skip special entries */
  70                 RETURN(0);
  71         }
  72
  73         LASSERT(sd != NULL);
  74
  75         if (ino == id_ino(sd->id)) {
  76                 strncpy(sd->name, name, namlen);
  77                 sd->rc = 0;
  78                 RETURN(-EINTR); /* break the readdir loop */
  79         }
  80         RETURN(0);
  81 }
  82
  83 int
  84 scan_name_in_parent(struct lustre_id *pid, struct lustre_id *id, char *name)
  85 {
  86         struct file * file;
  87         char *pname;
  88         struct scan_dir_data sd;
  89         int len, rc = 0;
  90         ENTRY;
  91
  92         len = strlen("__iopen__/") + 10 + 1;
  93         OBD_ALLOC(pname, len);
  94         if (!pname)
  95                 RETURN(-ENOMEM);
  96
  97         sprintf(pname, "__iopen__/0x%llx", id_ino(pid));
  98
  99         file = filp_open(pname, O_RDONLY, 0);
 100         if (IS_ERR(file)) {
 101                 CERROR("can't open directory %s: %d\n",
 102                        pname, (int) PTR_ERR(file));
 103                 GOTO(out, rc = PTR_ERR(file));
 104         }
 105
 106         sd.id = id;
 107         sd.name = name;
 108         sd.rc = -ENOENT;
 109         vfs_readdir(file, filldir, &sd);
 110
 111         filp_close(file, 0);
 112         rc = sd.rc;
 113
 114 out:
 115         OBD_FREE(pname, len);
 116         RETURN(rc);
 117
 118 }
 119
 120 /* id2pid - given id, get parent id or master id.
 121  * @obd:   obd device
 122  * @id:    child id to be parsed
 123  * @pid:   parent id or master id
 124  * @type:  id type
 125  */
 126 static int
 127 id2pid(struct obd_device *obd, struct lustre_id *id, struct lustre_id *pid,
 128        __u32 *type)
 129 {
 130         struct dentry *dentry = NULL;
 131         struct inode *inode = NULL;
 132         struct mea *mea = NULL;
 133         int mea_size, rc = 0;
 134         ENTRY;
 135
 136         dentry = mds_id2dentry(obd, id, NULL);
 137         if (IS_ERR(dentry) || !dentry->d_inode) {
 138                 CERROR("can't find inode "LPU64"\n", id_ino(id));
 139                 if (!IS_ERR(dentry)) l_dput(dentry);
 140                 RETURN(-ENOENT);
 141         }
 142         inode = dentry->d_inode;
 143
 144         if (S_ISDIR(inode->i_mode)) {
 145                 //LASSERT(S_ISDIR(id_type(id)));
 146                 rc = mds_md_get_attr(obd, inode, &mea, &mea_size);
 147                 if (rc)
 148                         GOTO(out, rc);
 149
 150                 if (!mea) {
 151                         *type = PP_DIR;
 152                         goto read_pid;
 153                 } else if (mea && mea->mea_count) {
 154                         *type = PP_SPLIT_MASTER;
 155                         goto read_pid;
 156                 } else {
 157                         *type = PP_SPLIT_SLAVE;
 158                         *pid = mea->mea_ids[mea->mea_master];
 159                 }
 160
 161         } else {
 162                 //LASSERT(!S_ISDIR(id_type(id)));
 163                 *type = PP_FILE;
 164 read_pid:
 165                 rc = mds_read_inode_pid(obd, inode, pid);
 166                 if (rc) {
 167                         CERROR("can't read parent ino(%lu) rc(%d).\n",
 168                                inode->i_ino, rc);
 169                         GOTO(out, rc);
 170                 }
 171         }
 172
 173         /* Well, if it's dir or master split, we have to check if it's
 174          * a cross-ref dir */
 175         if ((*type == PP_DIR || *type == PP_SPLIT_MASTER) &&
 176              id_group(id) != id_group(pid))
 177                 *type = PP_CROSS_DIR;
 178 out:
 179         if (mea)
 180                 OBD_FREE(mea, mea_size);
 181         l_dput(dentry);
 182         RETURN(rc);
 183 }
 184
 185 static int local_parse_id(struct obd_device *obd, struct parseid_pkg *pkg)
 186 {
 187         struct lvfs_run_ctxt saved;
 188         int rc = 0;
 189         ENTRY;
 190
 191         pkg->pp_rc = 0;
 192         pkg->pp_type = 0;
 193         memset(pkg->pp_name, 0, sizeof(pkg->pp_name));
 194
 195         LASSERT(obd->u.mds.mds_num == id_group(&pkg->pp_id1));
 196
 197         /* pp_id2 is present, which indicating we want to scan parent
 198          * dir(pp_id2) to find the cross-ref entry(pp_id1) */
 199         if (id_fid(&pkg->pp_id2)) {
 200                 /*
 201                 LASSERT(S_ISDIR(id_type(&pkg->pp_id1)));
 202                 LASSERT(S_ISDIR(id_type(&pkg->pp_id2)));
 203                 */
 204                 pkg->pp_type = PP_DIR;
 205                 goto scan;
 206         }
 207
 208         rc = id2pid(obd, &pkg->pp_id1, &pkg->pp_id2, &pkg->pp_type);
 209         if (rc)
 210                 GOTO(out, rc);
 211 scan:
 212         push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
 213
 214         switch (pkg->pp_type) {
 215         case PP_FILE:
 216         case PP_DIR:
 217         case PP_SPLIT_MASTER:
 218                 rc = scan_name_in_parent(&pkg->pp_id2, &pkg->pp_id1,
 219                                          pkg->pp_name);
 220                 if (rc)
 221                         CERROR("scan "LPU64" in parent failed. rc=%d\n",
 222                                id_ino(&pkg->pp_id1), rc);
 223                 break;
 224         case PP_SPLIT_SLAVE:
 225         case PP_CROSS_DIR:
 226                 break;
 227         default:
 228                 CERROR("invalid id\n");
 229                 break;
 230         }
 231
 232         pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
 233 out:
 234         pkg->pp_rc = rc;
 235         RETURN(rc);
 236 }
 237
 238 static int
 239 local_scan_audit_log(struct obd_device *obd, struct parseid_pkg *pkg);
 240
 241 int mds_parse_id(struct ptlrpc_request *req)
 242 {
 243         struct parseid_pkg *pkg, *reppkg;
 244         struct obd_device *obd = req->rq_export->exp_obd;
 245         int rc = 0, size = sizeof(*reppkg);
 246         ENTRY;
 247
 248         pkg = lustre_swab_reqbuf(req, 0, sizeof(*pkg),
 249                                  lustre_swab_parseid_pkg);
 250         if (pkg == NULL)
 251                 RETURN(-EPROTO);
 252
 253         rc = lustre_pack_reply(req, 1, &size, NULL);
 254         if (rc)
 255                 RETURN(rc);
 256
 257         reppkg = lustre_msg_buf(req->rq_repmsg, 0, sizeof(*reppkg));
 258         memcpy(reppkg, pkg, sizeof(*reppkg));
 259
 260         if (reppkg->pp_type == PP_AUDIT_LOG)
 261                 rc = local_scan_audit_log(obd, reppkg);
 262         else
 263                 rc = local_parse_id(obd, reppkg);
 264
 265         if (rc)
 266                 CERROR("local parseid failed. (rc:%d)\n", rc);
 267         RETURN(0);  /* we do need pack reply here */
 268 }
 269
 270 static int parse_id(struct obd_device *obd, struct parseid_pkg *pkg)
 271 {
 272         int rc = 0;
 273         int mds_num = id_group(&pkg->pp_id1);
 274         ENTRY;
 275
 276         LASSERT(mds_num >= 0);
 277
 278         if (mds_num == obd->u.mds.mds_num) {
 279                 rc = local_parse_id(obd, pkg);
 280         } else {
 281                 struct ptlrpc_request *req;
 282                 struct lmv_obd *lmv = &obd->u.mds.mds_md_obd->u.lmv;
 283                 struct parseid_pkg *body;
 284                 int size = sizeof(*body);
 285                 struct obd_export *exp;
 286
 287                 /* make sure connection established */
 288                 rc = obd_set_info(obd->u.mds.mds_md_exp, strlen("chkconnect"),
 289                                   "chkconnect", 0, NULL);
 290                 if (rc)
 291                         RETURN(rc);
 292
 293                 exp = lmv->tgts[mds_num].ltd_exp;
 294                 LASSERT(exp);
 295
 296                 req = ptlrpc_prep_req(class_exp2cliimp(exp),
 297                                       LUSTRE_MDS_VERSION, MDS_PARSE_ID, 1,
 298                                       &size, NULL);
 299                 if (!req)
 300                         RETURN(-ENOMEM);
 301
 302                 body = lustre_msg_buf(req->rq_reqmsg, 0, sizeof(*body));
 303                 memcpy(body, pkg, sizeof(*body));
 304
 305                 req->rq_replen = lustre_msg_size(1, &size);
 306
 307                 rc = ptlrpc_queue_wait(req);
 308                 if (rc)
 309                         GOTO(out, rc);
 310
 311                 body = lustre_swab_repbuf(req, 0, sizeof(*body),
 312                                           lustre_swab_parseid_pkg);
 313                 if (body == NULL) {
 314                         CERROR("can't unpack parseid_pkg\n");
 315                         GOTO(out, rc = -EPROTO);
 316                 }
 317                 memcpy(pkg, body, sizeof(*pkg));
 318 out:
 319                 ptlrpc_req_finished(req);
 320         }
 321         RETURN(rc);
 322 }
 323
 324 #define ROOT_FID        2
 325 struct name_item {
 326         struct list_head link;
 327         char             name[NAME_MAX + 1];
 328 };
 329
 330 int
 331 mds_id2name(struct obd_device *obd, struct lustre_id *id,
 332             struct list_head *list, struct lustre_id *lastid)
 333 {
 334         struct name_item *item;
 335         struct parseid_pkg *pkg;
 336         int rc = 0;
 337         ENTRY;
 338
 339         OBD_ALLOC(pkg, sizeof(*pkg));
 340         if (pkg == NULL)
 341                 RETURN(-ENOMEM);
 342
 343         pkg->pp_id1 = *id;
 344         while (id_fid(&pkg->pp_id1) != ROOT_FID) {
 345
 346                 rc = parse_id(obd, pkg);
 347                 if (rc) {
 348                         CDEBUG(D_SEC, "parse id failed. rc=%d\n", rc);
 349                         *lastid = pkg->pp_id1;
 350                         break;
 351                 }
 352
 353                 switch (pkg->pp_type) {
 354                 case PP_FILE:
 355                 case PP_DIR:
 356                 case PP_SPLIT_MASTER:
 357                         OBD_ALLOC(item, sizeof(*item));
 358                         if (item == NULL)
 359                                 GOTO(out, rc = -ENOMEM);
 360
 361                         INIT_LIST_HEAD(&item->link);
 362                         list_add(&item->link, list);
 363                         memcpy(item->name, pkg->pp_name, sizeof(item->name));
 364
 365                 case PP_SPLIT_SLAVE:
 366                         pkg->pp_id1 = pkg->pp_id2;
 367                         memset(&pkg->pp_id2, 0, sizeof(struct lustre_id));
 368                         break;
 369                 case PP_CROSS_DIR:
 370                         break;
 371                 default:
 372                         LBUG();
 373                         break;
 374                 }
 375
 376         }
 377 out:
 378         OBD_FREE(pkg, sizeof(*pkg));
 379         RETURN(rc);
 380 }
 381
 382 static int
 383 scan_audit_log_cb(struct llog_handle *llh, struct llog_rec_hdr *rec, void *data)
 384 {
 385         struct parseid_pkg *pkg = (struct parseid_pkg *)data;
 386         struct audit_record *ad_rec;
 387         struct audit_id_record *cid_rec, *pid_rec;
 388         struct audit_name_record *nm_rec;
 389         ENTRY;
 390
 391         if (!(le32_to_cpu(llh->lgh_hdr->llh_flags) & LLOG_F_IS_PLAIN)) {
 392                 CERROR("log is not plain\n");
 393                 RETURN(-EINVAL);
 394         }
 395         if (rec->lrh_type != SMFS_AUDIT_NAME_REC &&
 396             rec->lrh_type != LLOG_GEN_REC) {
 397                 RETURN(0);
 398         }
 399
 400         ad_rec = (struct audit_record *)((char *)rec + sizeof(*rec));
 401
 402         if (ad_rec->result ||
 403             ad_rec->opcode != AUDIT_UNLINK ||
 404             ad_rec->opcode != AUDIT_RENAME)
 405                 RETURN(0);
 406
 407         cid_rec = (struct audit_id_record *)((char *)ad_rec + sizeof(*ad_rec));
 408         pid_rec = cid_rec + 1;
 409         nm_rec = (struct audit_name_record *)
 410                 ((char *)pid_rec + sizeof(*pid_rec));
 411
 412         if (cid_rec->au_num == id_ino(&pkg->pp_id1) &&
 413             cid_rec->au_gen == id_gen(&pkg->pp_id1)) {
 414                 /* get parent id */
 415                 id_ino(&pkg->pp_id2) = pid_rec->au_num;
 416                 id_gen(&pkg->pp_id2) = pid_rec->au_gen;
 417                 id_type(&pkg->pp_id2) = pid_rec->au_type;
 418                 id_fid(&pkg->pp_id2) = pid_rec->au_fid;
 419                 id_group(&pkg->pp_id2) = pid_rec->au_mds;
 420                 /* get name */
 421                 memcpy(pkg->pp_name, nm_rec->name,
 422                        le32_to_cpu(nm_rec->name_len));
 423
 424                 RETURN(LLOG_PROC_BREAK);
 425         }
 426         RETURN(0);
 427 }
 428
 429 static int
 430 local_scan_audit_log(struct obd_device *obd, struct parseid_pkg *pkg)
 431 {
 432         struct llog_handle *llh = NULL;
 433         struct llog_ctxt *ctxt = llog_get_context(&obd->obd_llogs,
 434                                                   LLOG_AUDIT_ORIG_CTXT);
 435         int rc = 0;
 436         ENTRY;
 437
 438         if (ctxt)
 439                 llh = ctxt->loc_handle;
 440
 441         if (llh == NULL)
 442                 RETURN(-ENOENT);
 443
 444         rc = llog_cat_process(llh, (llog_cb_t)&scan_audit_log_cb, (void *)pkg);
 445         if (rc != LLOG_PROC_BREAK) {
 446                 CWARN("process catalog log failed: rc(%d)\n", rc);
 447                 RETURN(-ENOENT);
 448         }
 449         RETURN(0);
 450 }
 451
 452 static int
 453 scan_audit_log(struct obd_device *obd, struct lustre_id *cur_id,
 454                struct list_head *list, struct lustre_id *parent_id)
 455 {
 456         struct name_item *item = NULL;
 457         int rc = 0, mds_num = id_group(cur_id);
 458         struct parseid_pkg *pkg = NULL;
 459         ENTRY;
 460
 461         OBD_ALLOC(pkg, sizeof(*pkg));
 462         if (pkg == NULL)
 463                 RETURN(-ENOMEM);
 464
 465         pkg->pp_type = PP_AUDIT_LOG;
 466         pkg->pp_id1 = *cur_id;
 467
 468         if (obd->u.mds.mds_num == mds_num) {
 469                 rc = local_scan_audit_log(obd, pkg);
 470         } else {
 471                 struct ptlrpc_request *req;
 472                 struct lmv_obd *lmv = &obd->u.mds.mds_md_obd->u.lmv;
 473                 struct parseid_pkg *body;
 474                 int size = sizeof(*body);
 475                 struct obd_export *exp;
 476
 477                 /* make sure connection established */
 478                 rc = obd_set_info(obd->u.mds.mds_md_exp, strlen("chkconnect"),
 479                                   "chkconnect", 0, NULL);
 480                 if (rc)
 481                         RETURN(rc);
 482
 483                 exp = lmv->tgts[mds_num].ltd_exp;
 484                 LASSERT(exp);
 485
 486                 req = ptlrpc_prep_req(class_exp2cliimp(exp),
 487                                       LUSTRE_MDS_VERSION, MDS_PARSE_ID, 1,
 488                                       &size, NULL);
 489                 if (!req)
 490                         RETURN(-ENOMEM);
 491
 492                 body = lustre_msg_buf(req->rq_reqmsg, 0, sizeof(*body));
 493                 memcpy(body, pkg, sizeof(*body));
 494
 495                 req->rq_replen = lustre_msg_size(1, &size);
 496
 497                 rc = ptlrpc_queue_wait(req);
 498                 if (rc)
 499                         GOTO(out_req, rc);
 500
 501                 body = lustre_swab_repbuf(req, 0, sizeof(*body),
 502                                           lustre_swab_parseid_pkg);
 503                 if (body == NULL) {
 504                         CERROR("can't unpack parseid_pkg\n");
 505                         GOTO(out, rc = -EPROTO);
 506                 }
 507                 memcpy(pkg, body, sizeof(*pkg));
 508 out_req:
 509                 ptlrpc_req_finished(req);
 510
 511         }
 512
 513         if (!rc) rc = pkg->pp_rc;
 514         if (rc)
 515                 GOTO(out, rc);
 516
 517         *parent_id = pkg->pp_id2;
 518
 519         OBD_ALLOC(item, sizeof(*item));
 520         if (item == NULL)
 521                 GOTO(out, rc = -ENOMEM);
 522
 523         INIT_LIST_HEAD(&item->link);
 524         list_add(&item->link, list);
 525         memcpy(item->name, pkg->pp_name, sizeof(item->name));
 526 out:
 527         OBD_FREE(pkg, sizeof(*pkg));
 528         RETURN(rc);
 529 }
 530
 531 int
 532 mds_audit_id2name(struct obd_device *obd, char **name, int *namelen,
 533                   struct lustre_id *id)
 534 {
 535         int rc = 0;
 536         struct list_head list, *pos, *n;
 537         struct name_item *item;
 538         struct lustre_id parent_id, cur_id;
 539         ENTRY;
 540
 541         *namelen = 0;
 542         INIT_LIST_HEAD(&list);
 543
 544         cur_id = *id;
 545         if (id_fid(&cur_id) == ROOT_FID)
 546                 RETURN(0);
 547 next:
 548         memset(&parent_id, 0, sizeof(parent_id));
 549
 550         rc = mds_id2name(obd, &cur_id, &list, &parent_id);
 551         if (rc == -ENOENT) {
 552                 /* can't reconstruct name from id, turn to audit log */
 553                 LASSERT(id_fid(&parent_id));
 554                 cur_id = parent_id;
 555                 memset(&parent_id, 0, sizeof(parent_id));
 556
 557                 rc = scan_audit_log(obd, &cur_id, &list, &parent_id);
 558                 if (rc) {
 559                         CERROR("scan id in audit log failed. (rc:%d)\n", rc);
 560                         GOTO(out, rc);
 561                 }
 562
 563                 LASSERT(id_fid(&parent_id));
 564                 cur_id = parent_id;
 565                 goto next;
 566
 567         } else if (rc) {
 568                 CERROR("reconstruct name from id failed. (rc:%d)\n", rc);
 569                 GOTO(out, rc);
 570         }
 571
 572         list_for_each_safe (pos, n, &list) {
 573                 item = list_entry(pos, struct name_item, link);
 574                 *namelen += strlen(item->name) + 1;
 575         }
 576         OBD_ALLOC(*name, *namelen);
 577         if (*name == NULL)
 578                 rc = -ENOMEM;
 579 out:
 580         list_for_each_safe (pos, n, &list) {
 581                 item = list_entry(pos, struct name_item, link);
 582                 if (!rc) {
 583                         strcat(*name, "/");
 584                         strcat(*name, item->name);
 585                 }
 586                 list_del_init(&item->link);
 587                 OBD_FREE(item, sizeof(*item));
 588         }
 589         RETURN(rc);
 590 }
 591 EXPORT_SYMBOL(mds_audit_id2name);